Merge branch 'devel' into pr_remove_macros

The PR branch had merge conflicts with `devel` due to a major compiler
refactoring that extracted type definitions from `compiler/ast.nim` into
a new `compiler/astdef.nim` file.

## Changes

- Resolved conflict in `compiler/ast.nim` by accepting `devel`'s
refactored structure
- Merged 763 commits from `devel` branch (commit range:
`ce6a345..b3273e7`)
- Preserved original PR changes removing deprecated symbols from
`lib/core/macros.nim`

The core PR functionality (removal of deprecated macros API since
v0.18.1) remains intact while incorporating the upstream AST
refactoring.

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changelog.md

@@ -33,8 +33,6 @@ errors.
 
 - Bitshift operators (`shl`, `shr`, `ashr`) now apply bitmasking to the right operand in the C/C++/VM/JS backends.
 
-- Adds a new warning enabled by `--warning:ImplicitRangeConversion` that detects downsizing implicit conversions to range types (e.g., `int -> range[0..255]` or `range[1..256] -> range[0..255]`) that could cause runtime panics. Safe conversions like `range[0..255] -> range[0..65535]` and explicit casts are not warned on.
-
 ## Standard library additions and changes
 
 [//]: # "Additions:"
@@ -114,9 +112,7 @@ errors.
 
 ## Tool changes
 
-- Added `--raw` flag when generating JSON docs to not render markup.
 - Added `--stdinfile` flag to name of the file used when running program from stdin (defaults to `stdinfile.nim`)
-- Added `--styleCheck:warning` flag to treat style check violations as warnings.
 
 ## Documentation changes
 

compiler/ast.nim

@@ -501,7 +501,6 @@ const
 proc idGeneratorFromModule*(m: PSym): IdGenerator =
   assert m.kind == skModule
   result = IdGenerator(module: m.itemId.module, symId: m.itemId.item, typeId: 0, disambTable: initCountTable[PIdent]())
-  result.disambTable.inc m.name
 
 proc idGeneratorForPackage*(nextIdWillBe: int32): IdGenerator =
   result = IdGenerator(module: PackageModuleId, symId: nextIdWillBe - 1'i32, typeId: 0, disambTable: initCountTable[PIdent]())
@@ -550,25 +549,22 @@ proc addAllowNil*(father, son: PNode) {.inline.} =
   father.sons.add(son)
 
 proc add*(father, son: PType) =
-  ensureMutable father
   assert father.kind != tyProc or father.sonsImpl.len == 0
   assert son != nil
   father.sonsImpl.add son
 
 proc addAllowNil*(father, son: PType) {.inline.} =
-  ensureMutable father
   assert father.kind != tyProc or father.sonsImpl.len == 0
   father.sonsImpl.add son
 
-proc `[]`*(n: PType, i: int): PType {.inline.} =
+template `[]`*(n: PType, i: int): PType =
   if n.state == Partial: loadType(n)
   if n.kind == tyProc and i > 0:
     assert n.nImpl[i] != nil and n.nImpl[i].sym != nil
     n.nImpl[i].sym.typ
   else:
     n.sonsImpl[i]
-
-proc `[]=`*(n: PType, i: int; x: PType) {.inline.} =
+template `[]=`*(n: PType, i: int; x: PType) =
   if n.state == Partial: loadType(n)
   if n.kind == tyProc and i > 0:
     assert n.nImpl[i] != nil and n.nImpl[i].sym != nil
@@ -576,13 +572,12 @@ proc `[]=`*(n: PType, i: int; x: PType) {.inline.} =
   else:
     n.sonsImpl[i] = x
 
-proc `[]`*(n: PType, i: BackwardsIndex): PType {.inline.} =
+template `[]`*(n: PType, i: BackwardsIndex): PType =
   if n.state == Partial: loadType(n)
-  n[n.sonsImpl.len - i.int]
-
-proc `[]=`*(n: PType, i: BackwardsIndex; x: PType) {.inline.} =
+  n[n.len - i.int]
+template `[]=`*(n: PType, i: BackwardsIndex; x: PType) =
   if n.state == Partial: loadType(n)
-  n[n.sonsImpl.len - i.int] = x
+  n[n.len - i.int] = x
 
 proc getDeclPragma*(n: PNode): PNode =
   ## return the `nkPragma` node for declaration `n`, or `nil` if no pragma was found.
@@ -935,7 +930,6 @@ proc `$`*(s: PSym): string =
     result = "<nil>"
 
 proc len*(n: PType): int {.inline.} =
-  if n.state == Partial: loadType(n)
   if n.kind == tyProc:
     result = if n.nImpl == nil: 0 else: n.nImpl.len
   else:
@@ -1174,7 +1168,6 @@ proc skipTypesOrNil*(t: PType, kinds: TTypeKinds): PType =
   ## same as skipTypes but handles 'nil'
   result = t
   while result != nil and result.kind in kinds:
-    if result.state == Partial: loadType(result)
     if result.sonsImpl.len == 0: return nil
     result = last(result)
 

compiler/ast2nif.nim

@@ -159,6 +159,7 @@ type
     inProc: int
     #writtenTypes: seq[PType]  # types written in this module, to be unloaded later
     #writtenSyms: seq[PSym]    # symbols written in this module, to be unloaded later
+    exports: Table[FileIndex, HashSet[string]]  # module -> specific symbol names (empty = all)
     writtenPackages: HashSet[string]
 
 const
@@ -252,7 +253,6 @@ proc writeLoc(w: var Writer; dest: var TokenBuf; loc: TLoc) =
 proc writeTypeDef(w: var Writer; dest: var TokenBuf; typ: PType) =
   dest.buildTree tdefTag:
     dest.addSymDef pool.syms.getOrIncl(typeToNifSym(typ, w.infos.config)), NoLineInfo
-    dest.addDotToken # always private for the index generator
 
     #dest.addIdent toNifTag(typ.kind)
     writeFlags(dest, typ.flagsImpl)
@@ -321,7 +321,7 @@ proc collectGenericParams(w: var Writer; n: PNode) =
 proc writeSymDef(w: var Writer; dest: var TokenBuf; sym: PSym) =
   dest.addParLe sdefTag, trLineInfo(w, sym.infoImpl)
   dest.addSymDef pool.syms.getOrIncl(w.toNifSymName(sym)), NoLineInfo
-  if {sfExported, sfFromGeneric} * sym.flagsImpl == {sfExported}:
+  if sfExported in sym.flagsImpl:
     dest.addIdent "x"
   else:
     dest.addDotToken
@@ -345,8 +345,6 @@ proc writeSymDef(w: var Writer; dest: var TokenBuf; sym: PSym) =
 
   if sym.kindImpl == skModule:
     dest.addDotToken() # position will be set by the loader!
-  elif sym.kindImpl in {skVar, skLet, skForVar, skResult}:
-    dest.addIntLit 0  # hack for the VM which uses this field to store information
   else:
     dest.addIntLit sym.positionImpl
 
@@ -476,40 +474,6 @@ proc trImport(w: var Writer; n: PNode) =
       w.deps.addStrLit fp  # raw string literal, no wrapper needed
       w.deps.addParRi
 
-proc trExport(w: var Writer; n: PNode) =
-  # Collect export information for the index
-  # nkExportStmt children are nkSym nodes
-  # When exporting a module (export dollars), the module symbol is a child
-  # followed by all symbols from that module - we use empty set to mean "export all"
-  # When exporting specific symbols (export foo, bar), we collect their names
-  w.deps.addParLe pool.tags.getOrIncl(toNifTag(n.kind)), trLineInfo(w, n.info)
-  w.deps.addDotToken # flags
-  w.deps.addDotToken # type
-  for child in n:
-    if child.kind == nkSym:
-      let s = child.sym
-      if s.kindImpl == skModule:
-        discard "do not write module syms here"
-      else:
-        w.deps.addSymUse pool.syms.getOrIncl(w.toNifSymName(s)), NoLineInfo
-  w.deps.addParRi
-
-let replayTag = registerTag("replay")
-let repConverterTag = registerTag("repconverter")
-let repDestroyTag = registerTag("repdestroy")
-let repWasMovedTag = registerTag("repwasmoved")
-let repCopyTag = registerTag("repcopy")
-let repSinkTag = registerTag("repsink")
-let repDupTag = registerTag("repdup")
-let repTraceTag = registerTag("reptrace")
-let repDeepCopyTag = registerTag("repdeepcopy")
-let repEnumToStrTag = registerTag("repenumtostr")
-let repMethodTag = registerTag("repmethod")
-#let repClassTag = registerTag("repclass")
-let includeTag = registerTag("include")
-let importTag = registerTag("import")
-let implTag = registerTag("implementation")
-
 proc writeNode(w: var Writer; dest: var TokenBuf; n: PNode; forAst = false) =
   if n == nil:
     dest.addDotToken
@@ -617,9 +581,37 @@ proc writeNode(w: var Writer; dest: var TokenBuf; n: PNode; forAst = false) =
     of nkIncludeStmt:
       trInclude w, n
     of nkExportStmt, nkExportExceptStmt:
+      # Collect export information for the index
+      # nkExportStmt children are nkSym nodes
+      # When exporting a module (export dollars), the module symbol is a child
+      # followed by all symbols from that module - we use empty set to mean "export all"
+      # When exporting specific symbols (export foo, bar), we collect their names
       # Note: nkExportExceptStmt is transformed to nkExportStmt by semExportExcept,
       # but we handle both just in case
-      trExport w, n
+      var exportAllModules = initHashSet[FileIndex]()
+      for child in n:
+        if child.kind == nkSym:
+          let s = child.sym
+          if s.kindImpl == skModule:
+            # Export all from this module - use empty set
+            let modIdx = s.positionImpl.FileIndex
+            exportAllModules.incl modIdx
+            if modIdx notin w.exports:
+              w.exports[modIdx] = initHashSet[string]()  # empty means "export all"
+          else:
+            # Export specific symbol, but only if we're not already exporting all from this module
+            let modIdx = s.itemId.module.FileIndex
+            if modIdx notin exportAllModules:
+              if modIdx notin w.exports:
+                w.exports[modIdx] = initHashSet[string]()
+              w.exports[modIdx].incl s.name.s
+      # Write the export statement as a regular node
+      w.withNode dest, n:
+        for i in 0 ..< n.len:
+          if n[i].kind == nkSym and n[i].sym.kindImpl == skModule:
+            discard "do not write module syms here"
+          else:
+            writeNode(w, dest, n[i], forAst)
     else:
       w.withNode dest, n:
         for i in 0 ..< n.len:
@@ -671,6 +663,40 @@ proc createStmtList(buf: var TokenBuf; info: PackedLineInfo) {.inline.} =
   buf.addDotToken # flags
   buf.addDotToken # type
 
+proc buildExportBuf(w: var Writer): TokenBuf =
+  ## Build the export section for the NIF index from collected exports
+  result = createTokenBuf(32)
+  for modIdx, names in w.exports:
+    let path = toFullPath(w.infos.config, modIdx)
+    if names.len == 0:
+      # Export all from this module
+      result.addParLe(TagId(ExportIdx), NoLineInfo)
+      result.add strToken(pool.strings.getOrIncl(path), NoLineInfo)
+      result.addParRi()
+    else:
+      # Export specific symbols
+      result.addParLe(TagId(FromexportIdx), NoLineInfo)
+      result.add strToken(pool.strings.getOrIncl(path), NoLineInfo)
+      for name in names:
+        result.add identToken(pool.strings.getOrIncl(name), NoLineInfo)
+      result.addParRi()
+
+let replayTag = registerTag("replay")
+let repConverterTag = registerTag("repconverter")
+let repDestroyTag = registerTag("repdestroy")
+let repWasMovedTag = registerTag("repwasmoved")
+let repCopyTag = registerTag("repcopy")
+let repSinkTag = registerTag("repsink")
+let repDupTag = registerTag("repdup")
+let repTraceTag = registerTag("reptrace")
+let repDeepCopyTag = registerTag("repdeepcopy")
+let repEnumToStrTag = registerTag("repenumtostr")
+let repMethodTag = registerTag("repmethod")
+#let repClassTag = registerTag("repclass")
+let includeTag = registerTag("include")
+let importTag = registerTag("import")
+let implTag = registerTag("implementation")
+
 proc writeOp(w: var Writer; content: var TokenBuf; op: LogEntry) =
   case op.kind
   of HookEntry:
@@ -758,6 +784,10 @@ proc writeNifModule*(config: ConfigRef; thisModule: int32; n: PNode;
 
   writeFile(dest, d)
 
+  let exportBuf = buildExportBuf(w)
+  createIndex(d, dest[0].info, false,
+    IndexSections(exportBuf: exportBuf))
+
 # --------------------------- Loader (lazy!) -----------------------------------------------
 
 proc nodeKind(n: Cursor): TNodeKind {.inline.} =
@@ -815,7 +845,7 @@ type
   NifModule = ref object
     stream: nifstreams.Stream
     symCounter: int32
-    index: Table[string, NifIndexEntry]  # Simple embedded index for offsets
+    index: NifIndex
     suffix: string
 
   DecodeContext* = object
@@ -841,65 +871,25 @@ type
   LoadFlag* = enum
     LoadFullAst, AlwaysLoadInterface
 
-proc readEmbeddedIndex(s: var Stream): Table[string, NifIndexEntry] =
-  ## Reads the simple embedded index (index (kv sym offset)...) from indexStartsAt position.
-  result = initTable[string, NifIndexEntry]()
-  let indexPos = indexStartsAt(s.r)
-  if indexPos <= 0:
-    return
-  let contentPos = offset(s.r)  # Save position
-  s.r.jumpTo(indexPos)
-
-  var previousOffset = 0
-  var t = next(s)
-  let exportedTagId = pool.tags.getOrIncl("x")
-  if t.kind == ParLe and pool.tags[t.tagId] == ".index":
-    t = next(s)
-    while t.kind != EofToken and t.kind != ParRi:
-      if t.kind == ParLe:
-        let vis = if t.tagId == exportedTagId: Exported else: Hidden
-        let info = t.info
-        t = next(s)  # skip (kv
-        var key = ""
-        if t.kind == Symbol:
-          key = pool.syms[t.symId]
-        elif t.kind == Ident:
-          key = pool.strings[t.litId]
-        t = next(s)  # skip symbol
-        if t.kind == IntLit:
-          let offset = int(pool.integers[t.intId]) + previousOffset
-          result[key] = NifIndexEntry(offset: offset, info: info, vis: vis)
-          previousOffset = offset
-        t = next(s)  # skip offset
-        if t.kind == ParRi:
-          t = next(s)  # skip )
-      else:
-        t = next(s)
-
-  s.r.jumpTo(contentPos)  # Restore position
-
 proc moduleId(c: var DecodeContext; suffix: string; flags: set[LoadFlag] = {}): FileIndex =
   var isKnownFile = false
   result = c.infos.config.registerNifSuffix(suffix, isKnownFile)
-  # Always load the module's index if it's not already in c.mods
-  # This is needed when resolving symbols from modules that were registered elsewhere
-  # but haven't had their NIF index loaded yet
-  let hasEntry = c.mods.hasKey(result)
-  if not hasEntry or AlwaysLoadInterface in flags:
+  if not isKnownFile or AlwaysLoadInterface in flags:
     let modFile = (getNimcacheDir(c.infos.config) / RelativeFile(suffix & ".nif")).string
+    let idxFile = (getNimcacheDir(c.infos.config) / RelativeFile(suffix & ".s.idx.nif")).string
     if not fileExists(modFile):
       raiseAssert "NIF file not found for module suffix '" & suffix & "': " & modFile &
         ". This can happen when loading a module from NIF that references another module " &
         "whose NIF file hasn't been written yet."
-    var stream = nifstreams.open(modFile)
-    let index = readEmbeddedIndex(stream)
-    c.mods[result] = NifModule(stream: stream, index: index, suffix: suffix)
+    c.mods[result] = NifModule(stream: nifstreams.open(modFile), index: readIndex(idxFile), suffix: suffix)
 
 proc getOffset(c: var DecodeContext; module: FileIndex; nifName: string): NifIndexEntry =
   let ii = addr c.mods[module].index
-  result = ii[].getOrDefault(nifName)
+  result = ii.public.getOrDefault(nifName)
   if result.offset == 0:
-    raiseAssert "symbol has no offset: " & nifName
+    result = ii.private.getOrDefault(nifName)
+    if result.offset == 0:
+      raiseAssert "symbol has no offset: " & nifName
 
 proc loadNode(c: var DecodeContext; n: var Cursor; thisModule: string;
               localSyms: var Table[string, PSym]): PNode
@@ -1091,8 +1081,6 @@ proc loadTypeFromCursor(c: var DecodeContext; n: var Cursor; t: PType; localSyms
   expect n, SymbolDef
   # ignore the type's name, we have already used it to create this PType's itemId!
   inc n
-  expect n, DotToken
-  inc n
   #loadField t.kind
   loadField t.flagsImpl
   loadField t.callConvImpl
@@ -1407,33 +1395,83 @@ proc extractBasename(nifName: string): string =
 proc populateInterfaceTablesFromIndex(c: var DecodeContext; module: FileIndex;
                                       interf, interfHidden: var TStrTable; thisModule: string) =
   ## Populates interface tables from the NIF index structure.
-  ## Uses the simple embedded index for offsets, exports passed from processTopLevel.
+  ## Uses the index's public/private tables instead of traversing AST.
 
-  # Move the index table out to avoid iterator invalidation
+  # Move the public table and exports list out to avoid iterator invalidation
   # (moduleId can add to c.mods which would invalidate Table iterators)
-  var indexTab = move c.mods[module].index
+  # We move them back after iteration.
+  var publicTab = move c.mods[module].index.public
+  var exportsList = move c.mods[module].index.exports
 
-  # Add all symbols to interf (exported interface) and interfHidden
-  for nifName, entry in indexTab:
-    if entry.vis == Exported:
-      let sym = loadSymFromIndexEntry(c, module, nifName, entry, thisModule)
-      if sym != nil:
-        strTableAdd(interf, sym)
-        strTableAdd(interfHidden, sym)
-    elif not nifName.startsWith("`t"):
+  # Add all public symbols to interf (exported interface) and interfHidden
+  for nifName, entry in publicTab:
+    if not nifName.startsWith("`t"):
       # do not load types, they are not part of an interface but an implementation detail!
       #echo "LOADING SYM ", nifName, " ", entry.offset
       let sym = loadSymFromIndexEntry(c, module, nifName, entry, thisModule)
       if sym != nil:
+        strTableAdd(interf, sym)
         strTableAdd(interfHidden, sym)
 
-  # Move index table back
-  c.mods[module].index = move indexTab
+  # Move public table back
+  c.mods[module].index.public = move publicTab
+
+  # Process exports (re-exports from other modules)
+  for exp in exportsList:
+    let (path, kind, names) = exp
+    # Convert path to module suffix
+    let expSuffix = moduleSuffix(path, cast[seq[string]](c.infos.config.searchPaths))
+    # Load the exported module's index
+    let expModule = moduleId(c, expSuffix)
+
+    # Move the exported module's public table out to avoid iterator invalidation
+    var expPublicTab = move c.mods[expModule].index.public
+
+    # Build a set of names for filtering
+    var nameSet = initHashSet[string]()
+    for nameId in names:
+      nameSet.incl pool.strings[nameId]
+
+    # Add symbols based on export kind
+    for nifName, entry in expPublicTab:
+      if nifName.startsWith("`t"):
+        continue  # skip types
+
+      let basename = extractBasename(nifName)
+      let shouldInclude =
+        case kind
+        of ExportIdx: true  # export all
+        of FromexportIdx: basename in nameSet  # only specific names
+        of ExportexceptIdx: basename notin nameSet  # all except specific names
+        else: false
+
+      if shouldInclude:
+        let sym = loadSymFromIndexEntry(c, expModule, nifName, entry, expSuffix)
+        if sym != nil:
+          strTableAdd(interf, sym)
+          strTableAdd(interfHidden, sym)
+
+    # Move exported module's public table back
+    c.mods[expModule].index.public = move expPublicTab
+
+  # Move exports list back
+  c.mods[module].index.exports = move exportsList
+
+  when false:
+    # Add private symbols to interfHidden only
+    for nifName, entry in idx.private:
+      let sym = loadSymFromIndexEntry(c, module, nifName, entry, thisModule)
+      if sym != nil:
+        strTableAdd(interfHidden, sym)
 
 proc toNifFilename*(conf: ConfigRef; f: FileIndex): string =
   let suffix = moduleSuffix(conf, f)
   result = toGeneratedFile(conf, AbsoluteFile(suffix), ".nif").string
 
+proc toNifIndexFilename*(conf: ConfigRef; f: FileIndex): string =
+  let suffix = moduleSuffix(conf, f)
+  result = toGeneratedFile(conf, AbsoluteFile(suffix), ".s.idx.nif").string
+
 proc resolveSym(c: var DecodeContext; symAsStr: string; alsoConsiderPrivate: bool): PSym =
   result = c.syms.getOrDefault(symAsStr)[0]
   if result != nil:
@@ -1444,17 +1482,14 @@ proc resolveSym(c: var DecodeContext; symAsStr: string; alsoConsiderPrivate: boo
     return nil  # Local symbols shouldn't be hooks
   let module = moduleId(c, sn.module)
   # Look up the symbol in the module's index
-  # Try both formats: with module suffix (e.g., "foo.0.modulename") and without (e.g., "foo.0.")
-  # NIF spec allows local symbols to be stored without module suffix
-  var offs = c.mods[module].index.getOrDefault(symAsStr)
+  var offs = c.mods[module].index.public.getOrDefault(symAsStr)
   if offs.offset == 0:
-    # Try the format without module suffix
-    let localKey = sn.name & "." & $sn.count & "."
-    offs = c.mods[module].index.getOrDefault(localKey)
-  if offs.offset == 0:
-    return nil
-  if not alsoConsiderPrivate and offs.vis == Hidden:
-    return nil
+    if alsoConsiderPrivate:
+      offs = c.mods[module].index.private.getOrDefault(symAsStr)
+      if offs.offset == 0:
+        return nil
+    else:
+      return nil
   # Create a stub symbol
   let val = addr c.mods[module].symCounter
   inc val[]
@@ -1546,14 +1581,12 @@ proc loadImport(c: var DecodeContext; s: var Stream; deps: var seq[ModuleSuffix]
   else:
     raiseAssert "expected ParRi but got " & $tok.kind
 
-proc processTopLevel(c: var DecodeContext; s: var Stream; flags: set[LoadFlag];
-                     interf: var TStrTable; suffix: string; module: int): PrecompiledModule =
+proc processTopLevel(c: var DecodeContext; s: var Stream; flags: set[LoadFlag] = {}; suffix: string; module: int): PrecompiledModule =
   result = PrecompiledModule(topLevel: newNode(nkStmtList))
   var localSyms = initTable[string, PSym]()
 
   var t = next(s) # skip dot
   var cont = true
-  let exportTag = pool.tags.getOrIncl"export"
   while cont and t.kind != EofToken:
     if t.kind == ParLe:
       if t.tagId == replayTag:
@@ -1594,24 +1627,6 @@ proc processTopLevel(c: var DecodeContext; s: var Stream; flags: set[LoadFlag];
         t = loadLogOp(c, result.logOps, s, MethodEntry, attachedTrace, module)
         #elif t.tagId == repClassTag:
         #  t = loadLogOp(c, logOps, s, ClassEntry, attachedTrace, module)
-      elif t.tagId == exportTag:
-        t = next(s)  # skip (export
-        if t.kind == DotToken:
-          t = next(s) # skip dot
-          if t.kind == DotToken:
-            t = next(s) # skip dot
-        while true:
-          if t.kind == Symbol:
-            let symAsStr = pool.syms[t.symId]
-            let sym = resolveSym(c, symAsStr, false)
-            if sym != nil:
-              strTableAdd(interf, sym)
-            t = next(s)
-          elif t.kind == ParRi:
-            break
-          else:
-            raiseAssert "expected Symbol or ParRi but got " & $t.kind
-        t = next(s)
       elif t.tagId == includeTag:
         t = skipTree(s)
       elif t.tagId == importTag:
@@ -1634,25 +1649,25 @@ proc processTopLevel(c: var DecodeContext; s: var Stream; flags: set[LoadFlag];
 
 proc loadNifModule*(c: var DecodeContext; suffix: ModuleSuffix; interf, interfHidden: var TStrTable;
                     flags: set[LoadFlag] = {}): PrecompiledModule =
-  # Ensure module index is loaded - moduleId returns the FileIndex for this suffix
+    # Ensure module index is loaded - moduleId returns the FileIndex for this suffix
   let module = moduleId(c, string(suffix), flags)
 
+  # Populate interface tables from the NIF index structure
+  # Symbols are created as stubs (Partial state) and will be loaded lazily via loadSym
+  populateInterfaceTablesFromIndex(c, module, interf, interfHidden, string(suffix))
+
   # Load the module AST (or just replay actions if loadFullAst is false)
-  # processTopLevel also collects export instructions
   let s = addr c.mods[module].stream
+  s.r.jumpTo 0  # Start from beginning
+  discard processDirectives(s.r)
   var t = next(s[])
   if t.kind == ParLe and pool.tags[t.tagId] == toNifTag(nkStmtList):
     t = next(s[])  # skip (stmts
     t = next(s[])  # skip flags
-    result = processTopLevel(c, s[], flags, interf, string(suffix), module.int)
+    result = processTopLevel(c, s[], flags, string(suffix), module.int)
   else:
     result = PrecompiledModule(topLevel: newNode(nkStmtList))
 
-  # Populate interface tables from the NIF index structure
-  # Symbols are created as stubs (Partial state) and will be loaded lazily via loadSym
-  # Use exports collected by processTopLevel
-  populateInterfaceTablesFromIndex(c, module, interf, interfHidden, string(suffix))
-
 proc loadNifModule*(c: var DecodeContext; f: FileIndex; interf, interfHidden: var TStrTable;
                     flags: set[LoadFlag] = {}): PrecompiledModule =
   let suffix = ModuleSuffix(moduleSuffix(c.infos.config, f))

compiler/ccgtypes.nim

@@ -294,12 +294,7 @@ proc cacheGetType(tab: TypeCache; sig: SigHash): Rope =
   result = tab.getOrDefault(sig)
 
 proc addAbiCheck(m: BModule; t: PType, name: Rope) =
-  if isDefined(m.config, "checkAbi") and (let size = getSize(m.config, t); size != szUnknownSize) and
-    not (t.kind == tyObject and searchTypeFor(t, proc (t: PType): bool {.nimcall.} = t.kind == tyUncheckedArray)):
-    # `UncheckedArray`, not `ptr UncheckedArray` type field in object types is a flexible array.
-    # `sizeof` in C and Nim doesn't always return the same value for object types containing it.
-    # making `getSize` in Nim always returns the same value as `sizeof` in C from flexible arrays seems hard.
-    # See `SEQ_DECL_SIZE` in lib/nimbase.h
+  if isDefined(m.config, "checkAbi") and (let size = getSize(m.config, t); size != szUnknownSize):
     var msg = "backend & Nim disagree on size for: "
     msg.addTypeHeader(m.config, t)
     var msg2 = ""
@@ -1072,7 +1067,6 @@ proc getTypeDescAux(m: BModule; origTyp: PType, check: var IntSet; kind: TypeDes
                       else: getTupleDesc(m, t, result, check)
         if not isImportedType(t):
           m.s[cfsTypes].add(recdesc)
-          addAbiCheck(m, t, result)
         elif tfIncompleteStruct notin t.flags:
           discard # addAbiCheck(m, t, result) # already handled elsewhere
   of tySet:
@@ -2002,7 +1996,7 @@ proc genTypeInfoV1(m: BModule; t: PType; info: TLineInfo): Rope =
     owner = m.module.position.int32
 
   m.g.typeInfoMarker[sig] = (str: result, owner: owner)
-  #rememberEmittedTypeInfo(m.g.graph, FileIndex(owner), $result)
+  rememberEmittedTypeInfo(m.g.graph, FileIndex(owner), $result)
 
   case t.kind
   of tyEmpty, tyVoid: result = cIntValue(0)

compiler/cgen.nim

@@ -30,6 +30,7 @@ when not defined(leanCompiler):
 
 import std/strutils except `%`, addf # collides with ropes.`%`
 
+from ic / ic import ModuleBackendFlag
 import std/[dynlib, math, tables, sets, os, intsets, hashes]
 
 const
@@ -1925,6 +1926,36 @@ proc genMainProc(m: BModule) =
     if m.config.cppCustomNamespace.len > 0:
       openNamespaceNim(m.config.cppCustomNamespace, m.s[cfsProcs])
 
+proc registerInitProcs*(g: BModuleList; m: PSym; flags: set[ModuleBackendFlag]) =
+  ## Called from the IC backend.
+  if HasDatInitProc in flags:
+    let datInit = getSomeNameForModule(g.config, g.config.toFullPath(m.info.fileIndex).AbsoluteFile) & "DatInit000"
+    g.mainModProcs.addDeclWithVisibility(Private):
+      g.mainModProcs.addProcHeader(ccNimCall, datInit, CVoid, cProcParams())
+      g.mainModProcs.finishProcHeaderAsProto()
+    g.mainDatInit.addCallStmt(datInit)
+  if HasModuleInitProc in flags:
+    let init = getSomeNameForModule(g.config, g.config.toFullPath(m.info.fileIndex).AbsoluteFile) & "Init000"
+    g.mainModProcs.addDeclWithVisibility(Private):
+      g.mainModProcs.addProcHeader(ccNimCall, init, CVoid, cProcParams())
+      g.mainModProcs.finishProcHeaderAsProto()
+    if sfMainModule in m.flags:
+      g.mainModInit.addCallStmt(init)
+    elif sfSystemModule in m.flags:
+      g.mainDatInit.addCallStmt(init) # systemInit must called right after systemDatInit if any
+    else:
+      g.otherModsInit.addCallStmt(init)
+
+proc whichInitProcs*(m: BModule): set[ModuleBackendFlag] =
+  # called from IC.
+  result = {}
+  if m.hcrOn or m.preInitProc.s(cpsInit).buf.len > 0 or m.preInitProc.s(cpsStmts).buf.len > 0:
+    result.incl HasModuleInitProc
+  for i in cfsTypeInit1..cfsDynLibInit:
+    if m.s[i].buf.len != 0:
+      result.incl HasDatInitProc
+      break
+
 proc registerModuleToMain(g: BModuleList; m: BModule) =
   let
     init = m.getInitName

compiler/commands.nim

@@ -118,7 +118,7 @@ const
   errInvalidCmdLineOption = "invalid command line option: '$1'"
   errOnOrOffExpectedButXFound = "'on' or 'off' expected, but '$1' found"
   errOnOffOrListExpectedButXFound = "'on', 'off' or 'list' expected, but '$1' found"
-  errOffHintsError = "'off', 'hint', 'warning', 'error' or 'usages' expected, but '$1' found"
+  errOffHintsError = "'off', 'hint', 'error' or 'usages' expected, but '$1' found"
 
 proc invalidCmdLineOption(conf: ConfigRef; pass: TCmdLinePass, switch: string, info: TLineInfo) =
   if switch == " ": localError(conf, info, errInvalidCmdLineOption % "-")
@@ -494,6 +494,7 @@ proc parseCommand*(command: string): Command =
   of "gendepend": cmdGendepend
   of "dump": cmdDump
   of "parse": cmdParse
+  of "rod": cmdRod
   of "secret": cmdInteractive
   of "nop", "help": cmdNop
   of "jsonscript": cmdJsonscript
@@ -1108,9 +1109,6 @@ proc processSwitch*(switch, arg: string, pass: TCmdLinePass, info: TLineInfo;
   of "shownonexports":
     expectNoArg(conf, switch, arg, pass, info)
     showNonExportedFields(conf)
-  of "raw":
-    expectNoArg(conf, switch, arg, pass, info)
-    docRawOutput(conf)
   of "exceptions":
     case arg.normalize
     of "cpp": conf.exc = excCpp
@@ -1142,10 +1140,9 @@ proc processSwitch*(switch, arg: string, pass: TCmdLinePass, info: TLineInfo;
       defineSymbol(conf.symbols, "nimSeqsV2")
   of "stylecheck":
     case arg.normalize
-    of "off": conf.globalOptions = conf.globalOptions - {optStyleHint, optStyleError, optStyleWarning}
-    of "hint": conf.globalOptions = conf.globalOptions + {optStyleHint} - {optStyleError, optStyleWarning}
-    of "warning": conf.globalOptions = conf.globalOptions + {optStyleWarning} - {optStyleHint, optStyleError}
-    of "error": conf.globalOptions = conf.globalOptions + {optStyleError} - {optStyleHint, optStyleWarning}
+    of "off": conf.globalOptions = conf.globalOptions - {optStyleHint, optStyleError}
+    of "hint": conf.globalOptions = conf.globalOptions + {optStyleHint} - {optStyleError}
+    of "error": conf.globalOptions = conf.globalOptions + {optStyleError}
     of "usages": conf.globalOptions.incl optStyleUsages
     else: localError(conf, info, errOffHintsError % arg)
   of "showallmismatches":

compiler/condsyms.nim

@@ -175,5 +175,3 @@ proc initDefines*(symbols: StringTableRef) =
   defineSymbol("nimHasSetLengthSeqUninitMagic")
   defineSymbol("nimHasPreviewDuplicateModuleError")
 
-  defineSymbol("nimHasImplicitRangeConversion")
-

compiler/deps.nim

@@ -32,7 +32,6 @@ type
     nodes: seq[Node]
     processedModules: Table[string, int]  # modname -> node index
     includeStack: seq[string]
-    systemNodeId: int  # ID of the system.nim node
 
 proc toPair(c: DepContext; f: string): FilePair =
   FilePair(nimFile: f, modname: moduleSuffix(f, cast[seq[string]](c.config.searchPaths)))
@@ -129,9 +128,6 @@ proc processImport(c: var DepContext; importPath: string; current: Node) =
     # New module - create node and process it
     let newNode = Node(files: @[pair], id: c.nodes.len)
     current.deps.add newNode.id
-    # Every module depends on system.nim
-    if c.systemNodeId >= 0:
-      newNode.deps.add c.systemNodeId
     c.processedModules[pair.modname] = newNode.id
     c.nodes.add newNode
     traverseDeps(c, pair, newNode)
@@ -227,9 +223,9 @@ proc traverseDeps(c: var DepContext; pair: FilePair; current: Node) =
 
 proc generateBuildFile(c: DepContext): string =
   ## Generate the .build.nif file for nifmake
-  let nimcache = getNimcacheDir(c.config).string
-  createDir(nimcache)
-  result = nimcache / c.nodes[0].files[0].modname & ".build.nif"
+  createDir("nifcache")
+  result = "nifcache" / c.nodes[0].files[0].modname & ".build.nif"
+  #getNimcacheDir(c.config).string / c.nodes[0].files[0].modname & ".build.nif"
 
   var b = nifbuilder.open(result)
   defer: b.close()
@@ -254,7 +250,7 @@ proc generateBuildFile(c: DepContext): string =
   b.addSymbolDef "nim_m"
   b.addStrLit getAppFilename()
   b.addStrLit "m"
-  b.addStrLit "--nimcache:" & nimcache
+  b.addStrLit "--nimcache:nifcache"
   # Add search paths
   for p in c.config.searchPaths:
     b.addStrLit "--path:" & p.string
@@ -269,7 +265,7 @@ proc generateBuildFile(c: DepContext): string =
   b.addSymbolDef "nim_nifc"
   b.addStrLit getAppFilename()
   b.addStrLit "nifc"
-  b.addStrLit "--nimcache:" & nimcache
+  b.addStrLit "--nimcache:nifcache"
   # Add search paths
   for p in c.config.searchPaths:
     b.addStrLit "--path:" & p.string
@@ -358,8 +354,7 @@ proc commandIc*(conf: ConfigRef) =
       nifler: nifler,
       nodes: @[],
       processedModules: initTable[string, int](),
-      includeStack: @[],
-      systemNodeId: -1
+      includeStack: @[]
     )
 
     # Create root node for main project file
@@ -371,7 +366,6 @@ proc commandIc*(conf: ConfigRef) =
     # model the system.nim dependency:
     let sysNode = Node(files: @[toPair(c, (conf.libpath / RelativeFile"system.nim").string)], id: 1)
     c.nodes.add sysNode
-    c.systemNodeId = sysNode.id
     rootNode.deps.add sysNode.id
 
     # Process dependencies

compiler/docgen.nim

@@ -433,9 +433,6 @@ proc getVarIdx(varnames: openArray[string], id: string): int =
 
 proc genComment(d: PDoc, n: PNode): PRstNode =
   if n.comment.len > 0:
-    if optDocRaw in d.conf.globalOptions:
-      return newRstLeaf(n.comment)
-
     d.sharedState.currFileIdx = addRstFileIndex(d, n.info)
     try:
       result = parseRst(n.comment,
@@ -1179,12 +1176,8 @@ proc genJsonItem(d: PDoc, n, nameNode: PNode, k: TSymKind, nonExports = false):
                    "col": %n.info.col}
   )
   if comm != nil:
-    if optDocRaw in d.conf.globalOptions:
-      result.json["description"] = %comm.text
-    else:
-      result.rst = comm
-      result.rstField = "description"
-
+    result.rst = comm
+    result.rstField = "description"
   if r.buf.len > 0:
     result.json["code"] = %r.buf
   if k in routineKinds:
@@ -1425,7 +1418,7 @@ proc generateDoc*(d: PDoc, n, orig: PNode, config: ConfigRef, docFlags: DocFlags
   of nkExportExceptStmt: discard "transformed into nkExportStmt by semExportExcept"
   of nkFromStmt, nkImportExceptStmt: traceDeps(d, n[0])
   of nkCallKinds:
-    var comm = default(ItemPre)
+    var comm: ItemPre = default(ItemPre)
     getAllRunnableExamples(d, n, comm)
     if comm.len != 0: d.modDescPre.add(comm)
   else: discard

compiler/ic/bitabs.nim

@@ -0,0 +1,178 @@
+## A BiTable is a table that can be seen as an optimized pair
+## of `(Table[LitId, Val], Table[Val, LitId])`.
+
+import std/hashes
+import rodfiles
+
+when defined(nimPreviewSlimSystem):
+  import std/assertions
+
+type
+  LitId* = distinct uint32
+
+  BiTable*[T] = object
+    vals: seq[T] # indexed by LitId
+    keys: seq[LitId]  # indexed by hash(val)
+
+proc initBiTable*[T](): BiTable[T] = BiTable[T](vals: @[], keys: @[])
+
+proc nextTry(h, maxHash: Hash): Hash {.inline.} =
+  result = (h + 1) and maxHash
+
+template maxHash(t): untyped = high(t.keys)
+template isFilled(x: LitId): bool = x.uint32 > 0'u32
+
+proc `$`*(x: LitId): string {.borrow.}
+proc `<`*(x, y: LitId): bool {.borrow.}
+proc `<=`*(x, y: LitId): bool {.borrow.}
+proc `==`*(x, y: LitId): bool {.borrow.}
+proc hash*(x: LitId): Hash {.borrow.}
+
+
+proc len*[T](t: BiTable[T]): int = t.vals.len
+
+proc mustRehash(length, counter: int): bool {.inline.} =
+  assert(length > counter)
+  result = (length * 2 < counter * 3) or (length - counter < 4)
+
+const
+  idStart = 1
+
+template idToIdx(x: LitId): int = x.int - idStart
+
+proc hasLitId*[T](t: BiTable[T]; x: LitId): bool =
+  let idx = idToIdx(x)
+  result = idx >= 0 and idx < t.vals.len
+
+proc enlarge[T](t: var BiTable[T]) =
+  var n: seq[LitId]
+  newSeq(n, len(t.keys) * 2)
+  swap(t.keys, n)
+  for i in 0..high(n):
+    let eh = n[i]
+    if isFilled(eh):
+      var j = hash(t.vals[idToIdx eh]) and maxHash(t)
+      while isFilled(t.keys[j]):
+        j = nextTry(j, maxHash(t))
+      t.keys[j] = move n[i]
+
+proc getKeyId*[T](t: BiTable[T]; v: T): LitId =
+  let origH = hash(v)
+  var h = origH and maxHash(t)
+  if t.keys.len != 0:
+    while true:
+      let litId = t.keys[h]
+      if not isFilled(litId): break
+      if t.vals[idToIdx t.keys[h]] == v: return litId
+      h = nextTry(h, maxHash(t))
+  return LitId(0)
+
+proc getOrIncl*[T](t: var BiTable[T]; v: T): LitId =
+  let origH = hash(v)
+  var h = origH and maxHash(t)
+  if t.keys.len != 0:
+    while true:
+      let litId = t.keys[h]
+      if not isFilled(litId): break
+      if t.vals[idToIdx t.keys[h]] == v: return litId
+      h = nextTry(h, maxHash(t))
+    # not found, we need to insert it:
+    if mustRehash(t.keys.len, t.vals.len):
+      enlarge(t)
+      # recompute where to insert:
+      h = origH and maxHash(t)
+      while true:
+        let litId = t.keys[h]
+        if not isFilled(litId): break
+        h = nextTry(h, maxHash(t))
+  else:
+    setLen(t.keys, 16)
+    h = origH and maxHash(t)
+
+  result = LitId(t.vals.len + idStart)
+  t.keys[h] = result
+  t.vals.add v
+
+
+proc `[]`*[T](t: var BiTable[T]; litId: LitId): var T {.inline.} =
+  let idx = idToIdx litId
+  assert idx < t.vals.len
+  result = t.vals[idx]
+
+proc `[]`*[T](t: BiTable[T]; litId: LitId): lent T {.inline.} =
+  let idx = idToIdx litId
+  assert idx < t.vals.len
+  result = t.vals[idx]
+
+proc hash*[T](t: BiTable[T]): Hash =
+  ## as the keys are hashes of the values, we simply use them instead
+  var h: Hash = 0
+  for i, n in pairs t.keys:
+    h = h !& hash((i, n))
+  result = !$h
+
+proc store*[T](f: var RodFile; t: BiTable[T]) =
+  storeSeq(f, t.vals)
+  storeSeq(f, t.keys)
+
+proc load*[T](f: var RodFile; t: var BiTable[T]) =
+  loadSeq(f, t.vals)
+  loadSeq(f, t.keys)
+
+proc sizeOnDisc*(t: BiTable[string]): int =
+  result = 4
+  for x in t.vals:
+    result += x.len + 4
+  result += t.keys.len * sizeof(LitId)
+
+when isMainModule:
+
+  var t: BiTable[string]
+
+  echo getOrIncl(t, "hello")
+
+  echo getOrIncl(t, "hello")
+  echo getOrIncl(t, "hello3")
+  echo getOrIncl(t, "hello4")
+  echo getOrIncl(t, "helloasfasdfdsa")
+  echo getOrIncl(t, "hello")
+  echo getKeyId(t, "hello")
+  echo getKeyId(t, "none")
+
+  for i in 0 ..< 100_000:
+    discard t.getOrIncl($i & "___" & $i)
+
+  for i in 0 ..< 100_000:
+    assert t.getOrIncl($i & "___" & $i).idToIdx == i + 4
+  echo "begin"
+  echo t.vals.len
+
+  echo t.vals[0]
+  echo t.vals[1004]
+
+  echo "middle"
+
+  var tf: BiTable[float]
+
+  discard tf.getOrIncl(0.4)
+  discard tf.getOrIncl(16.4)
+  discard tf.getOrIncl(32.4)
+  echo getKeyId(tf, 32.4)
+
+  var f2 = open("testblah.bin", fmWrite)
+  echo store(f2, tf)
+  f2.close
+
+  var f1 = open("testblah.bin", fmRead)
+
+  var t2: BiTable[float]
+
+  echo f1.load(t2)
+  echo t2.vals.len
+
+  echo getKeyId(t2, 32.4)
+
+  echo "end"
+
+
+  f1.close

compiler/ic/cbackend.nim

@@ -0,0 +1,179 @@
+#
+#
+#           The Nim Compiler
+#        (c) Copyright 2021 Andreas Rumpf
+#
+#    See the file "copying.txt", included in this
+#    distribution, for details about the copyright.
+#
+
+## New entry point into our C/C++ code generator. Ideally
+## somebody would rewrite the old backend (which is 8000 lines of crufty Nim code)
+## to work on packed trees directly and produce the C code as an AST which can
+## then be rendered to text in a very simple manner. Unfortunately nobody wrote
+## this code. So instead we wrap the existing cgen.nim and its friends so that
+## we call directly into the existing code generation logic but avoiding the
+## naive, outdated `passes` design. Thus you will see some
+## `useAliveDataFromDce in flags` checks in the old code -- the old code is
+## also doing cross-module dependency tracking and DCE that we don't need
+## anymore. DCE is now done as prepass over the entire packed module graph.
+
+import std/[packedsets, algorithm, tables]
+
+when defined(nimPreviewSlimSystem):
+  import std/assertions
+
+import ".."/[ast, options, lineinfos, modulegraphs, cgendata, cgen,
+  pathutils, extccomp, msgs, modulepaths]
+
+import packed_ast, ic, dce, rodfiles
+
+proc unpackTree(g: ModuleGraph; thisModule: int;
+                tree: PackedTree; n: NodePos): PNode =
+  var decoder = initPackedDecoder(g.config, g.cache)
+  result = loadNodes(decoder, g.packed, thisModule, tree, n)
+
+proc setupBackendModule(g: ModuleGraph; m: var LoadedModule) =
+  if g.backend == nil:
+    g.backend = cgendata.newModuleList(g)
+  assert g.backend != nil
+  var bmod = cgen.newModule(BModuleList(g.backend), m.module, g.config, idgenFromLoadedModule(m))
+
+proc generateCodeForModule(g: ModuleGraph; m: var LoadedModule; alive: var AliveSyms) =
+  var bmod = BModuleList(g.backend).mods[m.module.position]
+  assert bmod != nil
+  bmod.flags.incl useAliveDataFromDce
+  bmod.alive = move alive[m.module.position]
+
+  for p in allNodes(m.fromDisk.topLevel):
+    let n = unpackTree(g, m.module.position, m.fromDisk.topLevel, p)
+    cgen.genTopLevelStmt(bmod, n)
+
+  finalCodegenActions(g, bmod, newNodeI(nkStmtList, m.module.info))
+  for disp in getDispatchers(g):
+    genProcLvl3(bmod, disp)
+  m.fromDisk.backendFlags = cgen.whichInitProcs(bmod)
+
+proc replayTypeInfo(g: ModuleGraph; m: var LoadedModule; origin: FileIndex) =
+  for x in mitems(m.fromDisk.emittedTypeInfo):
+    #echo "found type ", x, " for file ", int(origin)
+    g.emittedTypeInfo[x] = origin
+
+proc addFileToLink(config: ConfigRef; m: PSym) =
+  let filename = AbsoluteFile toFullPath(config, m.position.FileIndex)
+  let ext =
+      if config.backend == backendCpp: ".nim.cpp"
+      elif config.backend == backendObjc: ".nim.m"
+      else: ".nim.c"
+  let cfile = changeFileExt(completeCfilePath(config,
+                            mangleModuleName(config, filename).AbsoluteFile), ext)
+  let objFile = completeCfilePath(config, toObjFile(config, cfile))
+  if fileExists(objFile):
+    var cf = Cfile(nimname: m.name.s, cname: cfile,
+                   obj: objFile,
+                   flags: {CfileFlag.Cached})
+    addFileToCompile(config, cf)
+
+when defined(debugDce):
+  import os, std/packedsets
+
+proc storeAliveSymsImpl(asymFile: AbsoluteFile; s: seq[int32]) =
+  var f = rodfiles.create(asymFile.string)
+  f.storeHeader()
+  f.storeSection aliveSymsSection
+  f.storeSeq(s)
+  close f
+
+template prepare {.dirty.} =
+  let asymFile = toRodFile(config, AbsoluteFile toFullPath(config, position.FileIndex), ".alivesyms")
+  var s = newSeqOfCap[int32](alive[position].len)
+  for a in items(alive[position]): s.add int32(a)
+  sort(s)
+
+proc storeAliveSyms(config: ConfigRef; position: int; alive: AliveSyms) =
+  prepare()
+  storeAliveSymsImpl(asymFile, s)
+
+proc aliveSymsChanged(config: ConfigRef; position: int; alive: AliveSyms): bool =
+  prepare()
+  var f2 = rodfiles.open(asymFile.string)
+  f2.loadHeader()
+  f2.loadSection aliveSymsSection
+  var oldData: seq[int32] = @[]
+  f2.loadSeq(oldData)
+  f2.close
+  if f2.err == ok and oldData == s:
+    result = false
+  else:
+    when defined(debugDce):
+      let oldAsSet = toPackedSet[int32](oldData)
+      let newAsSet = toPackedSet[int32](s)
+      echo "set of live symbols changed ", asymFile.changeFileExt("rod"), " ", position, " ", f2.err
+      echo "in old but not in new ", oldAsSet.difference(newAsSet), " number of entries in old ", oldAsSet.len
+      echo "in new but not in old ", newAsSet.difference(oldAsSet), " number of entries in new ", newAsSet.len
+      #if execShellCmd(getAppFilename() & " rod " & quoteShell(asymFile.changeFileExt("rod"))) != 0:
+      #  echo "command failed"
+    result = true
+    storeAliveSymsImpl(asymFile, s)
+
+proc genPackedModule(g: ModuleGraph, i: int; alive: var AliveSyms) =
+  # case statement here to enforce exhaustive checks.
+  case g.packed[i].status
+  of undefined:
+    discard "nothing to do"
+  of loading, stored:
+    assert false
+  of storing, outdated:
+    storeAliveSyms(g.config, g.packed[i].module.position, alive)
+    generateCodeForModule(g, g.packed[i], alive)
+    closeRodFile(g, g.packed[i].module)
+  of loaded:
+    if g.packed[i].loadedButAliveSetChanged:
+      generateCodeForModule(g, g.packed[i], alive)
+    else:
+      addFileToLink(g.config, g.packed[i].module)
+      replayTypeInfo(g, g.packed[i], FileIndex(i))
+
+      if g.backend == nil:
+        g.backend = cgendata.newModuleList(g)
+      registerInitProcs(BModuleList(g.backend), g.packed[i].module, g.packed[i].fromDisk.backendFlags)
+
+proc generateCode*(g: ModuleGraph) =
+  ## The single entry point, generate C(++) code for the entire
+  ## Nim program aka `ModuleGraph`.
+  resetForBackend(g)
+  var alive = computeAliveSyms(g.packed, g.config)
+
+  when false:
+    for i in 0..<len(g.packed):
+      echo i, " is of status ", g.packed[i].status, " ", toFullPath(g.config, FileIndex(i))
+
+  # First pass: Setup all the backend modules for all the modules that have
+  # changed:
+  for i in 0..<len(g.packed):
+    # case statement here to enforce exhaustive checks.
+    case g.packed[i].status
+    of undefined:
+      discard "nothing to do"
+    of loading, stored:
+      assert false
+    of storing, outdated:
+      setupBackendModule(g, g.packed[i])
+    of loaded:
+      # Even though this module didn't change, DCE might trigger a change.
+      # Consider this case: Module A uses symbol S from B and B does not use
+      # S itself. A is then edited not to use S either. Thus we have to
+      # recompile B in order to remove S from the final result.
+      if aliveSymsChanged(g.config, g.packed[i].module.position, alive):
+        g.packed[i].loadedButAliveSetChanged = true
+        setupBackendModule(g, g.packed[i])
+
+  # Second pass: Code generation.
+  let mainModuleIdx = g.config.projectMainIdx2.int
+  # We need to generate the main module last, because only then
+  # all init procs have been registered:
+  for i in 0..<len(g.packed):
+    if i != mainModuleIdx:
+      genPackedModule(g, i, alive)
+  if mainModuleIdx >= 0:
+    genPackedModule(g, mainModuleIdx, alive)

compiler/ic/dce.nim

@@ -0,0 +1,169 @@
+#
+#
+#           The Nim Compiler
+#        (c) Copyright 2021 Andreas Rumpf
+#
+#    See the file "copying.txt", included in this
+#    distribution, for details about the copyright.
+#
+
+## Dead code elimination (=DCE) for IC.
+
+import std/[intsets, tables]
+
+when defined(nimPreviewSlimSystem):
+  import std/assertions
+
+import ".." / [ast, options, lineinfos, types]
+
+import packed_ast, ic, bitabs
+
+type
+  AliveSyms* = seq[IntSet]
+  AliveContext* = object ## Purpose is to fill the 'alive' field.
+    stack: seq[(int, TOptions, NodePos)] ## A stack for marking symbols as alive.
+    decoder: PackedDecoder ## We need a PackedDecoder for module ID address translations.
+    thisModule: int  ## The module we're currently analysing for DCE.
+    alive: AliveSyms ## The final result of our computation.
+    options: TOptions
+    compilerProcs: Table[string, (int, int32)]
+
+proc isExportedToC(c: var AliveContext; g: PackedModuleGraph; symId: int32): bool =
+  ## "Exported to C" procs are special (these are marked with '.exportc') because these
+  ## must not be optimized away!
+  let symPtr = unsafeAddr g[c.thisModule].fromDisk.syms[symId]
+  let flags = symPtr.flags
+  # due to a bug/limitation in the lambda lifting, unused inner procs
+  # are not transformed correctly; issue (#411). However, the whole purpose here
+  # is to eliminate unused procs. So there is no special logic required for this case.
+  if sfCompileTime notin flags:
+    if ({sfExportc, sfCompilerProc} * flags != {}) or
+        (symPtr.kind == skMethod):
+      result = true
+    else:
+      result = false
+      # XXX: This used to be a condition to:
+      #  (sfExportc in prc.flags and lfExportLib in prc.loc.flags) or
+    if sfCompilerProc in flags:
+      c.compilerProcs[g[c.thisModule].fromDisk.strings[symPtr.name]] = (c.thisModule, symId)
+  else:
+    result = false
+
+template isNotGeneric(n: NodePos): bool = ithSon(tree, n, genericParamsPos).kind == nkEmpty
+
+proc followLater(c: var AliveContext; g: PackedModuleGraph; module: int; item: int32) =
+  ## Marks a symbol 'item' as used and later in 'followNow' the symbol's body will
+  ## be analysed.
+  if not c.alive[module].containsOrIncl(item):
+    var body = g[module].fromDisk.syms[item].ast
+    if body != emptyNodeId:
+      let opt = g[module].fromDisk.syms[item].options
+      if g[module].fromDisk.syms[item].kind in routineKinds:
+        body = NodeId ithSon(g[module].fromDisk.bodies, NodePos body, bodyPos)
+      c.stack.add((module, opt, NodePos(body)))
+
+    when false:
+      let nid = g[module].fromDisk.syms[item].name
+      if nid != LitId(0):
+        let name = g[module].fromDisk.strings[nid]
+        if name in ["nimFrame", "callDepthLimitReached"]:
+          echo "I was called! ", name, " body exists: ", body != emptyNodeId, " ", module, " ", item
+
+proc requestCompilerProc(c: var AliveContext; g: PackedModuleGraph; name: string) =
+  let (module, item) = c.compilerProcs[name]
+  followLater(c, g, module, item)
+
+proc loadTypeKind(t: PackedItemId; c: AliveContext; g: PackedModuleGraph; toSkip: set[TTypeKind]): TTypeKind =
+  template kind(t: ItemId): TTypeKind = g[t.module].fromDisk.types[t.item].kind
+
+  var t2 = translateId(t, g, c.thisModule, c.decoder.config)
+  result = t2.kind
+  while result in toSkip:
+    t2 = translateId(g[t2.module].fromDisk.types[t2.item].types[^1], g, t2.module, c.decoder.config)
+    result = t2.kind
+
+proc rangeCheckAnalysis(c: var AliveContext; g: PackedModuleGraph; tree: PackedTree; n: NodePos) =
+  ## Replicates the logic of `ccgexprs.genRangeChck`.
+  ## XXX Refactor so that the duplicated logic is avoided. However, for now it's not clear
+  ## the approach has enough merit.
+  var dest = loadTypeKind(n.typ, c, g, abstractVar)
+  if optRangeCheck notin c.options or dest in {tyUInt..tyUInt64}:
+    discard "no need to generate a check because it was disabled"
+  else:
+    let n0t = loadTypeKind(n.firstSon.typ, c, g, {})
+    if n0t in {tyUInt, tyUInt64}:
+      c.requestCompilerProc(g, "raiseRangeErrorNoArgs")
+    else:
+      let raiser =
+        case loadTypeKind(n.typ, c, g, abstractVarRange)
+        of tyUInt..tyUInt64, tyChar: "raiseRangeErrorU"
+        of tyFloat..tyFloat128: "raiseRangeErrorF"
+        else: "raiseRangeErrorI"
+      c.requestCompilerProc(g, raiser)
+
+proc aliveCode(c: var AliveContext; g: PackedModuleGraph; tree: PackedTree; n: NodePos) =
+  ## Marks the symbols we encounter when we traverse the AST at `tree[n]` as alive, unless
+  ## it is purely in a declarative context (type section etc.).
+  case n.kind
+  of nkNone..pred(nkSym), succ(nkSym)..nkNilLit:
+    discard "ignore non-sym atoms"
+  of nkSym:
+    # This symbol is alive and everything its body references.
+    followLater(c, g, c.thisModule, tree[n].soperand)
+  of nkModuleRef:
+    let (n1, n2) = sons2(tree, n)
+    assert n1.kind == nkNone
+    assert n2.kind == nkNone
+    let m = n1.litId
+    let item = tree[n2].soperand
+    let otherModule = toFileIndexCached(c.decoder, g, c.thisModule, m).int
+    followLater(c, g, otherModule, item)
+  of nkMacroDef, nkTemplateDef, nkTypeSection, nkTypeOfExpr,
+     nkCommentStmt, nkIncludeStmt,
+     nkImportStmt, nkImportExceptStmt, nkExportStmt, nkExportExceptStmt,
+     nkFromStmt, nkStaticStmt:
+    discard
+  of nkVarSection, nkLetSection, nkConstSection:
+    # XXX ignore the defining local variable name?
+    for son in sonsReadonly(tree, n):
+      aliveCode(c, g, tree, son)
+  of nkChckRangeF, nkChckRange64, nkChckRange:
+    rangeCheckAnalysis(c, g, tree, n)
+  of nkProcDef, nkConverterDef, nkMethodDef, nkFuncDef, nkIteratorDef:
+    if n.firstSon.kind == nkSym and isNotGeneric(n):
+      let item = tree[n.firstSon].soperand
+      if isExportedToC(c, g, item):
+        # This symbol is alive and everything its body references.
+        followLater(c, g, c.thisModule, item)
+  else:
+    for son in sonsReadonly(tree, n):
+      aliveCode(c, g, tree, son)
+
+proc followNow(c: var AliveContext; g: PackedModuleGraph) =
+  ## Mark all entries in the stack. Marking can add more entries
+  ## to the stack but eventually we have looked at every alive symbol.
+  while c.stack.len > 0:
+    let (modId, opt, ast) = c.stack.pop()
+    c.thisModule = modId
+    c.options = opt
+    aliveCode(c, g, g[modId].fromDisk.bodies, ast)
+
+proc computeAliveSyms*(g: PackedModuleGraph; conf: ConfigRef): AliveSyms =
+  ## Entry point for our DCE algorithm.
+  var c = AliveContext(stack: @[], decoder: PackedDecoder(config: conf),
+                       thisModule: -1, alive: newSeq[IntSet](g.len),
+                       options: conf.options)
+  for i in countdown(len(g)-1, 0):
+    if g[i].status != undefined:
+      c.thisModule = i
+      for p in allNodes(g[i].fromDisk.topLevel):
+        aliveCode(c, g, g[i].fromDisk.topLevel, p)
+
+  followNow(c, g)
+  result = move(c.alive)
+
+proc isAlive*(a: AliveSyms; module: int, item: int32): bool =
+  ## Backends use this to query if a symbol is `alive` which means
+  ## we need to produce (C/C++/etc) code for it.
+  result = a[module].contains(item)
+

compiler/ic/design.rst

@@ -0,0 +1,56 @@
+====================================
+  Incremental Recompilations
+====================================
+
+We split the Nim compiler into a frontend and a backend.
+The frontend produces a set of `.rod` files. Every `.nim` module
+produces its own `.rod` file.
+
+- The IR must be a faithful representation of the AST in memory.
+- The backend can do its own caching but doesn't have to. In the
+  current implementation the backend also caches its results.
+
+Advantage of the "set of files" vs the previous global database:
+- By construction, we either read from the `.rod` file or from the
+  `.nim` file, there can be no inconsistency. There can also be no
+  partial updates.
+- No dependency to external packages (SQLite). SQLite simply is too
+  slow and the old way of serialization was too slow too. We use a
+  format designed for Nim and expect to base further tools on this
+  file format.
+
+References to external modules must be (moduleId, symId) pairs.
+The symbol IDs are module specific. This way no global ID increment
+mechanism needs to be implemented that we could get wrong. ModuleIds
+are rod-file specific too.
+
+
+
+Global state
+------------
+
+There is no global state.
+
+Rod File Format
+---------------
+
+It's a simple binary file format. `rodfiles.nim` contains some details.
+
+
+Backend
+-------
+
+Nim programmers have to come to enjoy whole-program dead code elimination,
+by default. Since this is a "whole program" optimization, it does break
+modularity. However, thanks to the packed AST representation we can perform
+this global analysis without having to unpack anything. This is basically
+a mark&sweep GC algorithm:
+
+- Start with the top level statements. Every symbol that is referenced
+  from a top level statement is not "dead" and needs to be compiled by
+  the backend.
+- Every symbol referenced from a referenced symbol also has to be
+  compiled.
+
+Caching logic: Only if the set of alive symbols is different from the
+last run, the module has to be regenerated.

compiler/ic/iclineinfos.nim

@@ -0,0 +1,84 @@
+#
+#
+#           The Nim Compiler
+#        (c) Copyright 2024 Andreas Rumpf
+#
+#    See the file "copying.txt", included in this
+#    distribution, for details about the copyright.
+#
+
+# For the line information we use 32 bits. They are used as follows:
+# Bit 0 (AsideBit): If we have inline line information or not. If not, the
+# remaining 31 bits are used as an index into a seq[(LitId, int, int)].
+#
+# We use 10 bits for the "file ID", this means a program can consist of as much
+# as 1024 different files. (If it uses more files than that, the overflow bit
+# would be set.)
+# This means we have 21 bits left to encode the (line, col) pair. We use 7 bits for the column
+# so 128 is the limit and 14 bits for the line number.
+# The packed representation supports files with up to 16384 lines.
+# Keep in mind that whenever any limit is reached the AsideBit is set and the real line
+# information is kept in a side channel.
+
+import std / assertions
+
+const
+  AsideBit = 1
+  FileBits = 10
+  LineBits = 14
+  ColBits = 7
+  FileMax = (1 shl FileBits) - 1
+  LineMax = (1 shl LineBits) - 1
+  ColMax = (1 shl ColBits) - 1
+
+static:
+  assert AsideBit + FileBits + LineBits + ColBits == 32
+
+import .. / ic / [bitabs, rodfiles] # for LitId
+
+type
+  PackedLineInfo* = distinct uint32
+
+  LineInfoManager* = object
+    aside: seq[(LitId, int32, int32)]
+
+const
+  NoLineInfo* = PackedLineInfo(0'u32)
+
+proc pack*(m: var LineInfoManager; file: LitId; line, col: int32): PackedLineInfo =
+  if file.uint32 <= FileMax.uint32 and line <= LineMax and col <= ColMax:
+    let col = if col < 0'i32: 0'u32 else: col.uint32
+    let line = if line < 0'i32: 0'u32 else: line.uint32
+    # use inline representation:
+    result = PackedLineInfo((file.uint32 shl 1'u32) or (line shl uint32(AsideBit + FileBits)) or
+      (col shl uint32(AsideBit + FileBits + LineBits)))
+  else:
+    result = PackedLineInfo((m.aside.len shl 1) or AsideBit)
+    m.aside.add (file, line, col)
+
+proc unpack*(m: LineInfoManager; i: PackedLineInfo): (LitId, int32, int32) =
+  let i = i.uint32
+  if (i and 1'u32) == 0'u32:
+    # inline representation:
+    result = (LitId((i shr 1'u32) and FileMax.uint32),
+      int32((i shr uint32(AsideBit + FileBits)) and LineMax.uint32),
+      int32((i shr uint32(AsideBit + FileBits + LineBits)) and ColMax.uint32))
+  else:
+    result = m.aside[int(i shr 1'u32)]
+
+proc getFileId*(m: LineInfoManager; i: PackedLineInfo): LitId =
+  result = unpack(m, i)[0]
+
+proc store*(r: var RodFile; m: LineInfoManager) = storeSeq(r, m.aside)
+proc load*(r: var RodFile; m: var LineInfoManager) = loadSeq(r, m.aside)
+
+when isMainModule:
+  var m = LineInfoManager(aside: @[])
+  for i in 0'i32..<16388'i32:
+    for col in 0'i32..<100'i32:
+      let packed = pack(m, LitId(1023), i, col)
+      let u = unpack(m, packed)
+      assert u[0] == LitId(1023)
+      assert u[1] == i
+      assert u[2] == col
+  echo m.aside.len

compiler/ic/integrity.nim

@@ -0,0 +1,155 @@
+#
+#
+#           The Nim Compiler
+#        (c) Copyright 2021 Andreas Rumpf
+#
+#    See the file "copying.txt", included in this
+#    distribution, for details about the copyright.
+#
+
+## Integrity checking for a set of .rod files.
+## The set must cover a complete Nim project.
+
+import std/[sets, tables]
+
+when defined(nimPreviewSlimSystem):
+  import std/assertions
+
+import ".." / [ast, modulegraphs]
+import packed_ast, bitabs, ic
+
+type
+  CheckedContext = object
+    g: ModuleGraph
+    thisModule: int32
+    checkedSyms: HashSet[ItemId]
+    checkedTypes: HashSet[ItemId]
+
+proc checkType(c: var CheckedContext; typeId: PackedItemId)
+proc checkForeignSym(c: var CheckedContext; symId: PackedItemId)
+proc checkNode(c: var CheckedContext; tree: PackedTree; n: NodePos)
+
+proc checkTypeObj(c: var CheckedContext; typ: PackedType) =
+  for child in typ.types:
+    checkType(c, child)
+  if typ.n != emptyNodeId:
+    checkNode(c, c.g.packed[c.thisModule].fromDisk.bodies, NodePos typ.n)
+  if typ.sym != nilItemId:
+    checkForeignSym(c, typ.sym)
+  if typ.owner != nilItemId:
+    checkForeignSym(c, typ.owner)
+  checkType(c, typ.typeInst)
+
+proc checkType(c: var CheckedContext; typeId: PackedItemId) =
+  if typeId == nilItemId: return
+  let itemId = translateId(typeId, c.g.packed, c.thisModule, c.g.config)
+  if not c.checkedTypes.containsOrIncl(itemId):
+    let oldThisModule = c.thisModule
+    c.thisModule = itemId.module
+    checkTypeObj c, c.g.packed[itemId.module].fromDisk.types[itemId.item]
+    c.thisModule = oldThisModule
+
+proc checkSym(c: var CheckedContext; s: PackedSym) =
+  if s.name != LitId(0):
+    assert c.g.packed[c.thisModule].fromDisk.strings.hasLitId s.name
+  checkType c, s.typ
+  if s.ast != emptyNodeId:
+    checkNode(c, c.g.packed[c.thisModule].fromDisk.bodies, NodePos s.ast)
+  if s.owner != nilItemId:
+    checkForeignSym(c, s.owner)
+
+proc checkLocalSym(c: var CheckedContext; item: int32) =
+  let itemId = ItemId(module: c.thisModule, item: item)
+  if not c.checkedSyms.containsOrIncl(itemId):
+    checkSym c, c.g.packed[c.thisModule].fromDisk.syms[item]
+
+proc checkForeignSym(c: var CheckedContext; symId: PackedItemId) =
+  let itemId = translateId(symId, c.g.packed, c.thisModule, c.g.config)
+  if not c.checkedSyms.containsOrIncl(itemId):
+    let oldThisModule = c.thisModule
+    c.thisModule = itemId.module
+    checkSym c, c.g.packed[itemId.module].fromDisk.syms[itemId.item]
+    c.thisModule = oldThisModule
+
+proc checkNode(c: var CheckedContext; tree: PackedTree; n: NodePos) =
+  let t = findType(tree, n)
+  if t != nilItemId:
+    checkType(c, t)
+  case n.kind
+  of nkEmpty, nkNilLit, nkType, nkNilRodNode:
+    discard
+  of nkIdent:
+    assert c.g.packed[c.thisModule].fromDisk.strings.hasLitId n.litId
+  of nkSym:
+    checkLocalSym(c, tree[n].soperand)
+  of directIntLit:
+    discard
+  of externIntLit, nkFloatLit..nkFloat128Lit:
+    assert c.g.packed[c.thisModule].fromDisk.numbers.hasLitId n.litId
+  of nkStrLit..nkTripleStrLit:
+    assert c.g.packed[c.thisModule].fromDisk.strings.hasLitId n.litId
+  of nkModuleRef:
+    let (n1, n2) = sons2(tree, n)
+    assert n1.kind == nkNone
+    assert n2.kind == nkNone
+    checkForeignSym(c, PackedItemId(module: n1.litId, item: tree[n2].soperand))
+  else:
+    for n0 in sonsReadonly(tree, n):
+      checkNode(c, tree, n0)
+
+proc checkTree(c: var CheckedContext; t: PackedTree) =
+  for p in allNodes(t): checkNode(c, t, p)
+
+proc checkLocalSymIds(c: var CheckedContext; m: PackedModule; symIds: seq[int32]) =
+  for symId in symIds:
+    assert symId >= 0 and symId < m.syms.len, $symId & " " & $m.syms.len
+
+proc checkModule(c: var CheckedContext; m: PackedModule) =
+  # We check that:
+  # - Every symbol references existing types and symbols.
+  # - Every tree node references existing types and symbols.
+  for _, v in pairs(m.syms):
+    checkLocalSym c, v.id
+
+  checkTree c, m.toReplay
+  checkTree c, m.topLevel
+
+  for e in m.exports:
+    #assert e[1] >= 0 and e[1] < m.syms.len
+    assert e[0] == m.syms[e[1]].name
+
+  for e in m.compilerProcs:
+    #assert e[1] >= 0 and e[1] < m.syms.len
+    assert e[0] == m.syms[e[1]].name
+
+  checkLocalSymIds c, m, m.converters
+  checkLocalSymIds c, m, m.methods
+  checkLocalSymIds c, m, m.trmacros
+  checkLocalSymIds c, m, m.pureEnums
+  #[
+    To do: Check all these fields:
+
+    reexports*: seq[(LitId, PackedItemId)]
+    macroUsages*: seq[(PackedItemId, PackedLineInfo)]
+
+    typeInstCache*: seq[(PackedItemId, PackedItemId)]
+    procInstCache*: seq[PackedInstantiation]
+    attachedOps*: seq[(TTypeAttachedOp, PackedItemId, PackedItemId)]
+    methodsPerGenericType*: seq[(PackedItemId, int, PackedItemId)]
+    enumToStringProcs*: seq[(PackedItemId, PackedItemId)]
+    methodsPerType*: seq[(PackedItemId, PackedItemId)]
+    dispatchers*: seq[PackedItemId]
+  ]#
+
+proc checkIntegrity*(g: ModuleGraph) =
+  var c = CheckedContext(g: g)
+  for i in 0..<len(g.packed):
+    # case statement here to enforce exhaustive checks.
+    case g.packed[i].status
+    of undefined:
+      discard "nothing to do"
+    of loading:
+      assert false, "cannot check integrity: Module still loading"
+    of stored, storing, outdated, loaded:
+      c.thisModule = int32 i
+      checkModule(c, g.packed[i].fromDisk)

compiler/ic/navigator.nim

@@ -0,0 +1,183 @@
+#
+#
+#           The Nim Compiler
+#        (c) Copyright 2021 Andreas Rumpf
+#
+#    See the file "copying.txt", included in this
+#    distribution, for details about the copyright.
+#
+
+## Supports the "nim check --ic:legacy --defusages:FILE,LINE,COL"
+## IDE-like features. It uses the set of .rod files to accomplish
+## its task. The set must cover a complete Nim project.
+
+import std/[sets, tables]
+
+from std/os import nil
+from std/private/miscdollars import toLocation
+
+when defined(nimPreviewSlimSystem):
+  import std/assertions
+
+import ".." / [ast, modulegraphs, msgs, options]
+import iclineinfos
+import packed_ast, bitabs, ic
+
+type
+  UnpackedLineInfo = object
+    file: LitId
+    line, col: int
+  NavContext = object
+    g: ModuleGraph
+    thisModule: int32
+    trackPos: UnpackedLineInfo
+    alreadyEmitted: HashSet[string]
+    outputSep: char # for easier testing, use short filenames and spaces instead of tabs.
+
+proc isTracked(man: LineInfoManager; current: PackedLineInfo, trackPos: UnpackedLineInfo, tokenLen: int): bool =
+  let (currentFile, currentLine, currentCol) = man.unpack(current)
+  if currentFile == trackPos.file and currentLine == trackPos.line:
+    let col = trackPos.col
+    if col >= currentCol and col < currentCol+tokenLen:
+      result = true
+    else:
+      result = false
+  else:
+    result = false
+
+proc searchLocalSym(c: var NavContext; s: PackedSym; info: PackedLineInfo): bool =
+  result = s.name != LitId(0) and
+    isTracked(c.g.packed[c.thisModule].fromDisk.man, info, c.trackPos, c.g.packed[c.thisModule].fromDisk.strings[s.name].len)
+
+proc searchForeignSym(c: var NavContext; s: ItemId; info: PackedLineInfo): bool =
+  let name = c.g.packed[s.module].fromDisk.syms[s.item].name
+  result = name != LitId(0) and
+    isTracked(c.g.packed[c.thisModule].fromDisk.man, info, c.trackPos, c.g.packed[s.module].fromDisk.strings[name].len)
+
+const
+  EmptyItemId = ItemId(module: -1'i32, item: -1'i32)
+
+proc search(c: var NavContext; tree: PackedTree): ItemId =
+  # We use the linear representation here directly:
+  for i in 0..<len(tree):
+    let i = NodePos(i)
+    case tree[i].kind
+    of nkSym:
+      let item = tree[i].soperand
+      if searchLocalSym(c, c.g.packed[c.thisModule].fromDisk.syms[item], tree[i].info):
+        return ItemId(module: c.thisModule, item: item)
+    of nkModuleRef:
+      let (currentFile, currentLine, currentCol) = c.g.packed[c.thisModule].fromDisk.man.unpack(tree[i].info)
+      if currentLine == c.trackPos.line and currentFile == c.trackPos.file:
+        let (n1, n2) = sons2(tree, i)
+        assert n1.kind == nkInt32Lit
+        assert n2.kind == nkInt32Lit
+        let pId = PackedItemId(module: n1.litId, item: tree[n2].soperand)
+        let itemId = translateId(pId, c.g.packed, c.thisModule, c.g.config)
+        if searchForeignSym(c, itemId, tree[i].info):
+          return itemId
+    else: discard
+  return EmptyItemId
+
+proc isDecl(tree: PackedTree; n: NodePos): bool =
+  # XXX This is not correct yet.
+  const declarativeNodes = procDefs + {nkMacroDef, nkTemplateDef,
+    nkLetSection, nkVarSection, nkUsingStmt, nkConstSection, nkTypeSection,
+    nkIdentDefs, nkEnumTy, nkVarTuple}
+  result = n.int >= 0 and tree[n].kind in declarativeNodes
+
+proc usage(c: var NavContext; info: PackedLineInfo; isDecl: bool) =
+  let (fileId, line, col) = unpack(c.g.packed[c.thisModule].fromDisk.man, info)
+  var m = ""
+  var file = c.g.packed[c.thisModule].fromDisk.strings[fileId]
+  if c.outputSep == ' ':
+    file = os.extractFilename file
+  toLocation(m, file, line, col + ColOffset)
+  if not c.alreadyEmitted.containsOrIncl(m):
+    msgWriteln c.g.config, (if isDecl: "def" else: "usage") & c.outputSep & m
+
+proc list(c: var NavContext; tree: PackedTree; sym: ItemId) =
+  for i in 0..<len(tree):
+    let i = NodePos(i)
+    case tree[i].kind
+    of nkSym:
+      let item = tree[i].soperand
+      if sym.item == item and sym.module == c.thisModule:
+        usage(c, tree[i].info, isDecl(tree, parent(i)))
+    of nkModuleRef:
+      let (n1, n2) = sons2(tree, i)
+      assert n1.kind == nkNone
+      assert n2.kind == nkNone
+      let pId = PackedItemId(module: n1.litId, item: tree[n2].soperand)
+      let itemId = translateId(pId, c.g.packed, c.thisModule, c.g.config)
+      if itemId.item == sym.item and sym.module == itemId.module:
+        usage(c, tree[i].info, isDecl(tree, parent(i)))
+    else: discard
+
+proc searchForIncludeFile(g: ModuleGraph; fullPath: string): int =
+  for i in 0..<len(g.packed):
+    for k in 1..high(g.packed[i].fromDisk.includes):
+      # we start from 1 because the first "include" file is
+      # the module's filename.
+      if os.cmpPaths(g.packed[i].fromDisk.strings[g.packed[i].fromDisk.includes[k][0]], fullPath) == 0:
+        return i
+  return -1
+
+proc nav(g: ModuleGraph) =
+  # translate the track position to a packed position:
+  let unpacked = g.config.m.trackPos
+  var mid = unpacked.fileIndex.int
+
+  let fullPath = toFullPath(g.config, unpacked.fileIndex)
+
+  if g.packed[mid].status == undefined:
+    # check if 'mid' is an include file of some other module:
+    mid = searchForIncludeFile(g, fullPath)
+
+  if mid < 0:
+    localError(g.config, unpacked, "unknown file name: " & fullPath)
+    return
+
+  let fileId = g.packed[mid].fromDisk.strings.getKeyId(fullPath)
+
+  if fileId == LitId(0):
+    internalError(g.config, unpacked, "cannot find a valid file ID")
+    return
+
+  var c = NavContext(
+    g: g,
+    thisModule: int32 mid,
+    trackPos: UnpackedLineInfo(line: unpacked.line.int, col: unpacked.col.int, file: fileId),
+    outputSep: if isDefined(g.config, "nimIcNavigatorTests"): ' ' else: '\t'
+  )
+  var symId = search(c, g.packed[mid].fromDisk.topLevel)
+  if symId == EmptyItemId:
+    symId = search(c, g.packed[mid].fromDisk.bodies)
+
+  if symId == EmptyItemId:
+    localError(g.config, unpacked, "no symbol at this position")
+    return
+
+  for i in 0..<len(g.packed):
+    # case statement here to enforce exhaustive checks.
+    case g.packed[i].status
+    of undefined:
+      discard "nothing to do"
+    of loading:
+      assert false, "cannot check integrity: Module still loading"
+    of stored, storing, outdated, loaded:
+      c.thisModule = int32 i
+      list(c, g.packed[i].fromDisk.topLevel, symId)
+      list(c, g.packed[i].fromDisk.bodies, symId)
+
+proc navDefinition*(g: ModuleGraph) = nav(g)
+proc navUsages*(g: ModuleGraph) = nav(g)
+proc navDefusages*(g: ModuleGraph) = nav(g)
+
+proc writeRodFiles*(g: ModuleGraph) =
+  for i in 0..<len(g.packed):
+    case g.packed[i].status
+    of undefined, loading, stored, loaded:
+      discard "nothing to do"
+    of storing, outdated:
+      closeRodFile(g, g.packed[i].module)

compiler/ic/packed_ast.nim

@@ -0,0 +1,367 @@
+#
+#
+#           The Nim Compiler
+#        (c) Copyright 2020 Andreas Rumpf
+#
+#    See the file "copying.txt", included in this
+#    distribution, for details about the copyright.
+#
+
+## Packed AST representation, mostly based on a seq of nodes.
+## For IC support. Far future: Rewrite the compiler passes to
+## use this representation directly in all the transformations,
+## it is superior.
+
+import std/[hashes, tables, strtabs]
+import bitabs, rodfiles
+import ".." / [ast, options]
+
+import iclineinfos
+
+when defined(nimPreviewSlimSystem):
+  import std/assertions
+
+type
+  SymId* = distinct int32
+  ModuleId* = distinct int32
+  NodePos* = distinct int
+
+  NodeId* = distinct int32
+
+  PackedItemId* = object
+    module*: LitId       # 0 if it's this module
+    item*: int32         # same as the in-memory representation
+
+const
+  nilItemId* = PackedItemId(module: LitId(0), item: 0.int32)
+
+const
+  emptyNodeId* = NodeId(-1)
+
+type
+  PackedLib* = object
+    kind*: TLibKind
+    generated*: bool
+    isOverridden*: bool
+    name*: LitId
+    path*: NodeId
+
+  PackedSym* = object
+    id*: int32
+    kind*: TSymKind
+    name*: LitId
+    typ*: PackedItemId
+    flags*: TSymFlags
+    magic*: TMagic
+    info*: PackedLineInfo
+    ast*: NodeId
+    owner*: PackedItemId
+    guard*: PackedItemId
+    bitsize*: int
+    alignment*: int # for alignment
+    options*: TOptions
+    position*: int
+    offset*: int32
+    disamb*: int32
+    externalName*: LitId # instead of TLoc
+    locFlags*: TLocFlags
+    annex*: PackedLib
+    when hasFFI:
+      cname*: LitId
+    constraint*: NodeId
+    instantiatedFrom*: PackedItemId
+
+  PackedType* = object
+    id*: int32
+    kind*: TTypeKind
+    callConv*: TCallingConvention
+    #nodekind*: TNodeKind
+    flags*: TTypeFlags
+    types*: seq[PackedItemId]
+    n*: NodeId
+    #nodeflags*: TNodeFlags
+    sym*: PackedItemId
+    owner*: PackedItemId
+    size*: BiggestInt
+    align*: int16
+    paddingAtEnd*: int16
+    # not serialized: loc*: TLoc because it is backend-specific
+    typeInst*: PackedItemId
+    nonUniqueId*: int32
+
+  PackedNode* = object     # 8 bytes
+    x: uint32
+    info*: PackedLineInfo
+
+  PackedTree* = object ## usually represents a full Nim module
+    nodes: seq[PackedNode]
+    withFlags: seq[(int32, TNodeFlags)]
+    withTypes: seq[(int32, PackedItemId)]
+
+  PackedInstantiation* = object
+    key*, sym*: PackedItemId
+    concreteTypes*: seq[PackedItemId]
+
+const
+  NodeKindBits = 8'u32
+  NodeKindMask = (1'u32 shl NodeKindBits) - 1'u32
+
+template kind*(n: PackedNode): TNodeKind = TNodeKind(n.x and NodeKindMask)
+template uoperand*(n: PackedNode): uint32 = (n.x shr NodeKindBits)
+template soperand*(n: PackedNode): int32 = int32(uoperand(n))
+
+template toX(k: TNodeKind; operand: uint32): uint32 =
+  uint32(k) or (operand shl NodeKindBits)
+
+template toX(k: TNodeKind; operand: LitId): uint32 =
+  uint32(k) or (operand.uint32 shl NodeKindBits)
+
+template typeId*(n: PackedNode): PackedItemId = n.typ
+
+proc `==`*(a, b: SymId): bool {.borrow.}
+proc hash*(a: SymId): Hash {.borrow.}
+
+proc `==`*(a, b: NodePos): bool {.borrow.}
+#proc `==`*(a, b: PackedItemId): bool {.borrow.}
+proc `==`*(a, b: NodeId): bool {.borrow.}
+
+proc newTreeFrom*(old: PackedTree): PackedTree =
+  result = PackedTree(nodes: @[])
+  when false: result.sh = old.sh
+
+proc addIdent*(tree: var PackedTree; s: LitId; info: PackedLineInfo) =
+  tree.nodes.add PackedNode(x: toX(nkIdent, uint32(s)), info: info)
+
+proc addSym*(tree: var PackedTree; s: int32; info: PackedLineInfo) =
+  tree.nodes.add PackedNode(x: toX(nkSym, cast[uint32](s)), info: info)
+
+proc addSymDef*(tree: var PackedTree; s: SymId; info: PackedLineInfo) =
+  tree.nodes.add PackedNode(x: toX(nkSym, cast[uint32](s)), info: info)
+
+proc isAtom*(tree: PackedTree; pos: int): bool {.inline.} = tree.nodes[pos].kind <= nkNilLit
+
+type
+  PatchPos = distinct int
+
+proc addNode*(t: var PackedTree; kind: TNodeKind; operand: int32;
+              typeId: PackedItemId = nilItemId; info: PackedLineInfo;
+              flags: TNodeFlags = {}) =
+  t.nodes.add PackedNode(x: toX(kind, cast[uint32](operand)), info: info)
+  if flags != {}:
+    t.withFlags.add (t.nodes.len.int32 - 1, flags)
+  if typeId != nilItemId:
+    t.withTypes.add (t.nodes.len.int32 - 1, typeId)
+
+proc prepare*(tree: var PackedTree; kind: TNodeKind; flags: TNodeFlags; typeId: PackedItemId; info: PackedLineInfo): PatchPos =
+  result = PatchPos tree.nodes.len
+  tree.addNode(kind = kind, flags = flags, operand = 0, info = info, typeId = typeId)
+
+proc prepare*(dest: var PackedTree; source: PackedTree; sourcePos: NodePos): PatchPos =
+  result = PatchPos dest.nodes.len
+  dest.nodes.add source.nodes[sourcePos.int]
+
+proc patch*(tree: var PackedTree; pos: PatchPos) =
+  let pos = pos.int
+  let k = tree.nodes[pos].kind
+  assert k > nkNilLit
+  let distance = int32(tree.nodes.len - pos)
+  assert distance > 0
+  tree.nodes[pos].x = toX(k, cast[uint32](distance))
+
+proc len*(tree: PackedTree): int {.inline.} = tree.nodes.len
+
+proc `[]`*(tree: PackedTree; i: NodePos): lent PackedNode {.inline.} =
+  tree.nodes[i.int]
+
+template rawSpan(n: PackedNode): int = int(uoperand(n))
+
+proc nextChild(tree: PackedTree; pos: var int) {.inline.} =
+  if tree.nodes[pos].kind > nkNilLit:
+    assert tree.nodes[pos].uoperand > 0
+    inc pos, tree.nodes[pos].rawSpan
+  else:
+    inc pos
+
+iterator sonsReadonly*(tree: PackedTree; n: NodePos): NodePos =
+  var pos = n.int
+  assert tree.nodes[pos].kind > nkNilLit
+  let last = pos + tree.nodes[pos].rawSpan
+  inc pos
+  while pos < last:
+    yield NodePos pos
+    nextChild tree, pos
+
+iterator sons*(dest: var PackedTree; tree: PackedTree; n: NodePos): NodePos =
+  let patchPos = prepare(dest, tree, n)
+  for x in sonsReadonly(tree, n): yield x
+  patch dest, patchPos
+
+iterator isons*(dest: var PackedTree; tree: PackedTree;
+                n: NodePos): (int, NodePos) =
+  var i = 0
+  for ch0 in sons(dest, tree, n):
+    yield (i, ch0)
+    inc i
+
+iterator sonsFrom1*(tree: PackedTree; n: NodePos): NodePos =
+  var pos = n.int
+  assert tree.nodes[pos].kind > nkNilLit
+  let last = pos + tree.nodes[pos].rawSpan
+  inc pos
+  if pos < last:
+    nextChild tree, pos
+  while pos < last:
+    yield NodePos pos
+    nextChild tree, pos
+
+iterator sonsWithoutLast2*(tree: PackedTree; n: NodePos): NodePos =
+  var count = 0
+  for child in sonsReadonly(tree, n):
+    inc count
+  var pos = n.int
+  assert tree.nodes[pos].kind > nkNilLit
+  let last = pos + tree.nodes[pos].rawSpan
+  inc pos
+  while pos < last and count > 2:
+    yield NodePos pos
+    dec count
+    nextChild tree, pos
+
+proc parentImpl(tree: PackedTree; n: NodePos): NodePos =
+  # finding the parent of a node is rather easy:
+  var pos = n.int - 1
+  while pos >= 0 and (isAtom(tree, pos) or (pos + tree.nodes[pos].rawSpan - 1 < n.int)):
+    dec pos
+  #assert pos >= 0, "node has no parent"
+  result = NodePos(pos)
+
+template parent*(n: NodePos): NodePos = parentImpl(tree, n)
+
+proc hasXsons*(tree: PackedTree; n: NodePos; x: int): bool =
+  var count = 0
+  if tree.nodes[n.int].kind > nkNilLit:
+    for child in sonsReadonly(tree, n): inc count
+  result = count == x
+
+proc hasAtLeastXsons*(tree: PackedTree; n: NodePos; x: int): bool =
+  if tree.nodes[n.int].kind > nkNilLit:
+    var count = 0
+    for child in sonsReadonly(tree, n):
+      inc count
+      if count >= x: return true
+  return false
+
+proc firstSon*(tree: PackedTree; n: NodePos): NodePos {.inline.} =
+  NodePos(n.int+1)
+proc kind*(tree: PackedTree; n: NodePos): TNodeKind {.inline.} =
+  tree.nodes[n.int].kind
+proc litId*(tree: PackedTree; n: NodePos): LitId {.inline.} =
+  LitId tree.nodes[n.int].uoperand
+proc info*(tree: PackedTree; n: NodePos): PackedLineInfo {.inline.} =
+  tree.nodes[n.int].info
+
+proc findType*(tree: PackedTree; n: NodePos): PackedItemId =
+  for x in tree.withTypes:
+    if x[0] == int32(n): return x[1]
+    if x[0] > int32(n): return nilItemId
+  return nilItemId
+
+proc findFlags*(tree: PackedTree; n: NodePos): TNodeFlags =
+  for x in tree.withFlags:
+    if x[0] == int32(n): return x[1]
+    if x[0] > int32(n): return {}
+  return {}
+
+template typ*(n: NodePos): PackedItemId =
+  tree.findType(n)
+template flags*(n: NodePos): TNodeFlags =
+  tree.findFlags(n)
+
+template uoperand*(n: NodePos): uint32 =
+  tree.nodes[n.int].uoperand
+
+proc span*(tree: PackedTree; pos: int): int {.inline.} =
+  if isAtom(tree, pos): 1 else: tree.nodes[pos].rawSpan
+
+proc sons2*(tree: PackedTree; n: NodePos): (NodePos, NodePos) =
+  assert(not isAtom(tree, n.int))
+  let a = n.int+1
+  let b = a + span(tree, a)
+  result = (NodePos a, NodePos b)
+
+proc sons3*(tree: PackedTree; n: NodePos): (NodePos, NodePos, NodePos) =
+  assert(not isAtom(tree, n.int))
+  let a = n.int+1
+  let b = a + span(tree, a)
+  let c = b + span(tree, b)
+  result = (NodePos a, NodePos b, NodePos c)
+
+proc ithSon*(tree: PackedTree; n: NodePos; i: int): NodePos =
+  result = default(NodePos)
+  if tree.nodes[n.int].kind > nkNilLit:
+    var count = 0
+    for child in sonsReadonly(tree, n):
+      if count == i: return child
+      inc count
+  assert false, "node has no i-th child"
+
+when false:
+  proc `@`*(tree: PackedTree; lit: LitId): lent string {.inline.} =
+    tree.sh.strings[lit]
+
+template kind*(n: NodePos): TNodeKind = tree.nodes[n.int].kind
+template info*(n: NodePos): PackedLineInfo = tree.nodes[n.int].info
+template litId*(n: NodePos): LitId = LitId tree.nodes[n.int].uoperand
+
+template symId*(n: NodePos): SymId = SymId tree.nodes[n.int].soperand
+
+proc firstSon*(n: NodePos): NodePos {.inline.} = NodePos(n.int+1)
+
+const
+  externIntLit* = {nkCharLit,
+    nkIntLit,
+    nkInt8Lit,
+    nkInt16Lit,
+    nkInt32Lit,
+    nkInt64Lit,
+    nkUIntLit,
+    nkUInt8Lit,
+    nkUInt16Lit,
+    nkUInt32Lit,
+    nkUInt64Lit}
+
+  externSIntLit* = {nkIntLit, nkInt8Lit, nkInt16Lit, nkInt32Lit, nkInt64Lit}
+  externUIntLit* = {nkUIntLit, nkUInt8Lit, nkUInt16Lit, nkUInt32Lit, nkUInt64Lit}
+  directIntLit* = nkNone
+
+template copyInto*(dest, n, body) =
+  let patchPos = prepare(dest, tree, n)
+  body
+  patch dest, patchPos
+
+template copyIntoKind*(dest, kind, info, body) =
+  let patchPos = prepare(dest, kind, info)
+  body
+  patch dest, patchPos
+
+proc getNodeId*(tree: PackedTree): NodeId {.inline.} = NodeId tree.nodes.len
+
+iterator allNodes*(tree: PackedTree): NodePos =
+  var p = 0
+  while p < tree.len:
+    yield NodePos(p)
+    let s = span(tree, p)
+    inc p, s
+
+proc toPackedItemId*(item: int32): PackedItemId {.inline.} =
+  PackedItemId(module: LitId(0), item: item)
+
+proc load*(f: var RodFile; t: var PackedTree) =
+  loadSeq f, t.nodes
+  loadSeq f, t.withFlags
+  loadSeq f, t.withTypes
+
+proc store*(f: var RodFile; t: PackedTree) =
+  storeSeq f, t.nodes
+  storeSeq f, t.withFlags
+  storeSeq f, t.withTypes

compiler/ic/replayer.nim

@@ -19,6 +19,8 @@ import std/tables
 when defined(nimPreviewSlimSystem):
   import std/assertions
 
+import packed_ast, ic, bitabs
+
 proc replayStateChanges*(module: PSym; g: ModuleGraph) =
   let list = module.ast
   assert list != nil
@@ -86,3 +88,84 @@ proc replayStateChanges*(module: PSym; g: ModuleGraph) =
           g.cacheSeqs[destKey].add val
       else:
         internalAssert g.config, false
+
+proc replayBackendProcs*(g: ModuleGraph; module: int) =
+  for it in mitems(g.packed[module].fromDisk.attachedOps):
+    let key = translateId(it[0], g.packed, module, g.config)
+    let op = it[1]
+    let tmp = translateId(it[2], g.packed, module, g.config)
+    let symId = FullId(module: tmp.module, packed: it[2])
+    g.attachedOps[op][key] = LazySym(id: symId, sym: nil)
+
+  for it in mitems(g.packed[module].fromDisk.enumToStringProcs):
+    let key = translateId(it[0], g.packed, module, g.config)
+    let tmp = translateId(it[1], g.packed, module, g.config)
+    let symId = FullId(module: tmp.module, packed: it[1])
+    g.enumToStringProcs[key] = LazySym(id: symId, sym: nil)
+
+  for it in mitems(g.packed[module].fromDisk.methodsPerType):
+    let key = translateId(it[0], g.packed, module, g.config)
+    let tmp = translateId(it[1], g.packed, module, g.config)
+    let symId = FullId(module: tmp.module, packed: it[1])
+    g.methodsPerType.mgetOrPut(key, @[]).add LazySym(id: symId, sym: nil)
+
+  for it in mitems(g.packed[module].fromDisk.dispatchers):
+    let tmp = translateId(it, g.packed, module, g.config)
+    let symId = FullId(module: tmp.module, packed: it)
+    g.dispatchers.add LazySym(id: symId, sym: nil)
+
+proc replayGenericCacheInformation*(g: ModuleGraph; module: int) =
+  ## We remember the generic instantiations a module performed
+  ## in order to to avoid the code bloat that generic code tends
+  ## to imply. This is cheaper than deduplication of identical
+  ## generic instantiations. However, deduplication is more
+  ## powerful and general and I hope to implement it soon too
+  ## (famous last words).
+  assert g.packed[module].status == loaded
+  for it in g.packed[module].fromDisk.typeInstCache:
+    let key = translateId(it[0], g.packed, module, g.config)
+    g.typeInstCache.mgetOrPut(key, @[]).add LazyType(id: FullId(module: module, packed: it[1]), typ: nil)
+
+  for it in mitems(g.packed[module].fromDisk.procInstCache):
+    let key = translateId(it.key, g.packed, module, g.config)
+    let sym = translateId(it.sym, g.packed, module, g.config)
+    var concreteTypes = newSeq[FullId](it.concreteTypes.len)
+    for i in 0..high(it.concreteTypes):
+      let tmp = translateId(it.concreteTypes[i], g.packed, module, g.config)
+      concreteTypes[i] = FullId(module: tmp.module, packed: it.concreteTypes[i])
+
+    g.procInstCache.mgetOrPut(key, @[]).add LazyInstantiation(
+      module: module, sym: FullId(module: sym.module, packed: it.sym),
+      concreteTypes: concreteTypes, inst: nil)
+
+  for it in mitems(g.packed[module].fromDisk.methodsPerGenericType):
+    let key = translateId(it[0], g.packed, module, g.config)
+    let col = it[1]
+    let tmp = translateId(it[2], g.packed, module, g.config)
+    let symId = FullId(module: tmp.module, packed: it[2])
+    g.methodsPerGenericType.mgetOrPut(key, @[]).add (col, LazySym(id: symId, sym: nil))
+
+  replayBackendProcs(g, module)
+
+  for it in mitems(g.packed[module].fromDisk.methods):
+    let sym = loadSymFromId(g.config, g.cache, g.packed, module,
+                            PackedItemId(module: LitId(0), item: it))
+    methodDef(g, g.idgen, sym)
+
+  when false:
+    # not used anymore:
+    for it in mitems(g.packed[module].fromDisk.compilerProcs):
+      let symId = FullId(module: module, packed: PackedItemId(module: LitId(0), item: it[1]))
+      g.lazyCompilerprocs[g.packed[module].fromDisk.sh.strings[it[0]]] = symId
+
+  for it in mitems(g.packed[module].fromDisk.converters):
+    let symId = FullId(module: module, packed: PackedItemId(module: LitId(0), item: it))
+    g.ifaces[module].converters.add LazySym(id: symId, sym: nil)
+
+  for it in mitems(g.packed[module].fromDisk.trmacros):
+    let symId = FullId(module: module, packed: PackedItemId(module: LitId(0), item: it))
+    g.ifaces[module].patterns.add LazySym(id: symId, sym: nil)
+
+  for it in mitems(g.packed[module].fromDisk.pureEnums):
+    let symId = FullId(module: module, packed: PackedItemId(module: LitId(0), item: it))
+    g.ifaces[module].pureEnums.add LazySym(id: symId, sym: nil)

compiler/ic/rodfiles.nim

@@ -0,0 +1,283 @@
+#
+#
+#           The Nim Compiler
+#        (c) Copyright 2020 Andreas Rumpf
+#
+#    See the file "copying.txt", included in this
+#    distribution, for details about the copyright.
+#
+
+## Low level binary format used by the compiler to store and load various AST
+## and related data.
+##
+## NB: this is incredibly low level and if you're interested in how the
+##     compiler works and less a storage format, you're probably looking for
+##     the `ic` or `packed_ast` modules to understand the logical format.
+
+from std/typetraits import supportsCopyMem
+
+when defined(nimPreviewSlimSystem):
+  import std/[syncio, assertions]
+
+import std / tables
+
+## Overview
+## ========
+## `RodFile` represents a Rod File (versioned binary format), and the
+## associated data for common interactions such as IO and error tracking
+## (`RodFileError`). The file format broken up into sections (`RodSection`)
+## and preceded by a header (see: `cookie`). The precise layout, section
+## ordering and data following the section are determined by the user. See
+## `ic.loadRodFile`.
+##
+## A basic but "wrong" example of the lifecycle:
+## ---------------------------------------------
+## 1. `create` or `open`        - create a new one or open an existing
+## 2. `storeHeader`             - header info
+## 3. `storePrim` or `storeSeq` - save your stuff
+## 4. `close`                   - and we're done
+##
+## Now read the bits below to understand what's missing.
+##
+## ### Issues with the Example
+## Missing Sections:
+## This is a low level API, so headers and sections need to be stored and
+## loaded by the user, see `storeHeader` & `loadHeader` and `storeSection` &
+## `loadSection`, respectively.
+##
+## No Error Handling:
+## The API is centered around IO and prone to error, each operation checks or
+## sets the `RodFile.err` field. A user of this API needs to handle these
+## appropriately.
+##
+## API Notes
+## =========
+##
+## Valid inputs for Rod files
+## --------------------------
+## ASTs, hopes, dreams, and anything as long as it and any children it may have
+## support `copyMem`. This means anything that is not a pointer and that does not contain a pointer. At a glance these are:
+## * string
+## * objects & tuples (fields are recursed)
+## * sequences AKA `seq[T]`
+##
+## Note on error handling style
+## ----------------------------
+## A flag based approach is used where operations no-op in case of a
+## preexisting error and set the flag if they encounter one.
+##
+## Misc
+## ----
+## * 'Prim' is short for 'primitive', as in a non-sequence type
+
+type
+  RodSection* = enum
+    versionSection
+    configSection
+    stringsSection
+    checkSumsSection
+    depsSection
+    numbersSection
+    exportsSection
+    hiddenSection
+    reexportsSection
+    compilerProcsSection
+    trmacrosSection
+    convertersSection
+    methodsSection
+    pureEnumsSection
+    toReplaySection
+    topLevelSection
+    bodiesSection
+    symsSection
+    typesSection
+    typeInstCacheSection
+    procInstCacheSection
+    attachedOpsSection
+    methodsPerGenericTypeSection
+    enumToStringProcsSection
+    methodsPerTypeSection
+    dispatchersSection
+    typeInfoSection  # required by the backend
+    backendFlagsSection
+    aliveSymsSection # beware, this is stored in a `.alivesyms` file.
+    sideChannelSection
+    namespaceSection
+    symnamesSection
+
+  RodFileError* = enum
+    ok, tooBig, cannotOpen, ioFailure, wrongHeader, wrongSection, configMismatch,
+    includeFileChanged
+
+  RodFile* = object
+    f*: File
+    currentSection*: RodSection # for error checking
+    err*: RodFileError # little experiment to see if this works
+                       # better than exceptions.
+
+const
+  RodVersion = 2
+  defaultCookie = [byte(0), byte('R'), byte('O'), byte('D'),
+            byte(sizeof(int)*8), byte(system.cpuEndian), byte(0), byte(RodVersion)]
+
+proc setError(f: var RodFile; err: RodFileError) {.inline.} =
+  f.err = err
+  #raise newException(IOError, "IO error")
+
+proc storePrim*(f: var RodFile; s: string) =
+  ## Stores a string.
+  ## The len is prefixed to allow for later retreival.
+  if f.err != ok: return
+  if s.len >= high(int32):
+    setError f, tooBig
+    return
+  var lenPrefix = int32(s.len)
+  if writeBuffer(f.f, addr lenPrefix, sizeof(lenPrefix)) != sizeof(lenPrefix):
+    setError f, ioFailure
+  else:
+    if s.len != 0:
+      if writeBuffer(f.f, unsafeAddr(s[0]), s.len) != s.len:
+        setError f, ioFailure
+
+proc storePrim*[T](f: var RodFile; x: T) =
+  ## Stores a non-sequence/string `T`.
+  ## If `T` doesn't support `copyMem` and is an object or tuple then the fields
+  ## are written -- the user from context will need to know which `T` to load.
+  if f.err != ok: return
+  when supportsCopyMem(T):
+    if writeBuffer(f.f, unsafeAddr(x), sizeof(x)) != sizeof(x):
+      setError f, ioFailure
+  elif T is tuple:
+    for y in fields(x):
+      storePrim(f, y)
+  elif T is object:
+    for y in fields(x):
+      when y is seq:
+        storeSeq(f, y)
+      else:
+        storePrim(f, y)
+  else:
+    {.error: "unsupported type for 'storePrim'".}
+
+proc storeSeq*[T](f: var RodFile; s: seq[T]) =
+  ## Stores a sequence of `T`s, with the len as a prefix for later retrieval.
+  if f.err != ok: return
+  if s.len >= high(int32):
+    setError f, tooBig
+    return
+  var lenPrefix = int32(s.len)
+  if writeBuffer(f.f, addr lenPrefix, sizeof(lenPrefix)) != sizeof(lenPrefix):
+    setError f, ioFailure
+  else:
+    for i in 0..<s.len:
+      storePrim(f, s[i])
+
+proc storeOrderedTable*[K, T](f: var RodFile; s: OrderedTable[K, T]) =
+  if f.err != ok: return
+  if s.len >= high(int32):
+    setError f, tooBig
+    return
+  var lenPrefix = int32(s.len)
+  if writeBuffer(f.f, addr lenPrefix, sizeof(lenPrefix)) != sizeof(lenPrefix):
+    setError f, ioFailure
+  else:
+    for _, v in s:
+      storePrim(f, v)
+
+proc loadPrim*(f: var RodFile; s: var string) =
+  ## Read a string, the length was stored as a prefix
+  if f.err != ok: return
+  var lenPrefix = int32(0)
+  if readBuffer(f.f, addr lenPrefix, sizeof(lenPrefix)) != sizeof(lenPrefix):
+    setError f, ioFailure
+  else:
+    s = newString(lenPrefix)
+    if lenPrefix > 0:
+      if readBuffer(f.f, unsafeAddr(s[0]), s.len) != s.len:
+        setError f, ioFailure
+
+proc loadPrim*[T](f: var RodFile; x: var T) =
+  ## Load a non-sequence/string `T`.
+  if f.err != ok: return
+  when supportsCopyMem(T):
+    if readBuffer(f.f, unsafeAddr(x), sizeof(x)) != sizeof(x):
+      setError f, ioFailure
+  elif T is tuple:
+    for y in fields(x):
+      loadPrim(f, y)
+  elif T is object:
+    for y in fields(x):
+      when y is seq:
+        loadSeq(f, y)
+      else:
+        loadPrim(f, y)
+  else:
+    {.error: "unsupported type for 'loadPrim'".}
+
+proc loadSeq*[T](f: var RodFile; s: var seq[T]) =
+  ## `T` must be compatible with `copyMem`, see `loadPrim`
+  if f.err != ok: return
+  var lenPrefix = int32(0)
+  if readBuffer(f.f, addr lenPrefix, sizeof(lenPrefix)) != sizeof(lenPrefix):
+    setError f, ioFailure
+  else:
+    s = newSeq[T](lenPrefix)
+    for i in 0..<lenPrefix:
+      loadPrim(f, s[i])
+
+proc loadOrderedTable*[K, T](f: var RodFile; s: var OrderedTable[K, T]) =
+  ## `T` must be compatible with `copyMem`, see `loadPrim`
+  if f.err != ok: return
+  var lenPrefix = int32(0)
+  if readBuffer(f.f, addr lenPrefix, sizeof(lenPrefix)) != sizeof(lenPrefix):
+    setError f, ioFailure
+  else:
+    s = initOrderedTable[K, T](lenPrefix)
+    for i in 0..<lenPrefix:
+      var x = default T
+      loadPrim(f, x)
+      s[x.id] = x
+
+proc storeHeader*(f: var RodFile; cookie = defaultCookie) =
+  ## stores the header which is described by `cookie`.
+  if f.err != ok: return
+  if f.f.writeBytes(cookie, 0, cookie.len) != cookie.len:
+    setError f, ioFailure
+
+proc loadHeader*(f: var RodFile; cookie = defaultCookie) =
+  ## Loads the header which is described by `cookie`.
+  if f.err != ok: return
+  var thisCookie: array[cookie.len, byte] = default(array[cookie.len, byte])
+  if f.f.readBytes(thisCookie, 0, thisCookie.len) != thisCookie.len:
+    setError f, ioFailure
+  elif thisCookie != cookie:
+    setError f, wrongHeader
+
+proc storeSection*(f: var RodFile; s: RodSection) =
+  ## update `currentSection` and writes the bytes value of s.
+  if f.err != ok: return
+  assert f.currentSection < s
+  f.currentSection = s
+  storePrim(f, s)
+
+proc loadSection*(f: var RodFile; expected: RodSection) =
+  ## read the bytes value of s, sets and error if the section is incorrect.
+  if f.err != ok: return
+  var s: RodSection = default(RodSection)
+  loadPrim(f, s)
+  if expected != s and f.err == ok:
+    setError f, wrongSection
+
+proc create*(filename: string): RodFile =
+  ## create the file and open it for writing
+  result = default(RodFile)
+  if not open(result.f, filename, fmWrite):
+    setError result, cannotOpen
+
+proc close*(f: var RodFile) = close(f.f)
+
+proc open*(filename: string): RodFile =
+  ## open the file for reading
+  result = default(RodFile)
+  if not open(result.f, filename, fmRead):
+    setError result, cannotOpen

compiler/importer.nim

@@ -108,8 +108,8 @@ proc rawImportSymbol(c: PContext, s, origin: PSym; importSet: var IntSet) =
           else:
             importPureEnumField(c, e)
   else:
-    if s.kind == skConverter: addConverter(c, s)
-    if hasPattern(s): addPattern(c, s)
+    if s.kind == skConverter: addConverter(c, LazySym(sym: s))
+    if hasPattern(s): addPattern(c, LazySym(sym: s))
   if s.owner != origin:
     c.exportIndirections.incl((origin.id, s.id))
 
@@ -190,19 +190,22 @@ proc addImport(c: PContext; im: sink ImportedModule) =
 template addUnnamedIt(c: PContext, fromMod: PSym; filter: untyped) {.dirty.} =
   for it in mitems c.graph.ifaces[fromMod.position].converters:
     if filter:
-      if sfExported in it.flags:
+      loadPackedSym(c.graph, it)
+      if sfExported in it.sym.flags:
         addConverter(c, it)
   for it in mitems c.graph.ifaces[fromMod.position].patterns:
     if filter:
-      if sfExported in it.flags:
+      loadPackedSym(c.graph, it)
+      if sfExported in it.sym.flags:
         addPattern(c, it)
   for it in mitems c.graph.ifaces[fromMod.position].pureEnums:
     if filter:
-      importPureEnumFields(c, it, it.typ)
+      loadPackedSym(c.graph, it)
+      importPureEnumFields(c, it.sym, it.sym.typ)
 
 proc importAllSymbolsExcept(c: PContext, fromMod: PSym, exceptSet: IntSet) =
   c.addImport ImportedModule(m: fromMod, mode: importExcept, exceptSet: exceptSet)
-  addUnnamedIt(c, fromMod, it.name.id notin exceptSet)
+  addUnnamedIt(c, fromMod, it.sym.name.id notin exceptSet)
 
 proc importAllSymbols*(c: PContext, fromMod: PSym) =
   c.addImport ImportedModule(m: fromMod, mode: importAll)
@@ -289,8 +292,9 @@ proc myImportModule(c: PContext, n: var PNode, importStmtResult: PNode): PSym =
       c.recursiveDep = err
 
     let trackUnusedImport = warnUnusedImportX in c.config.notes
+    var realModule: PSym
     discard pushOptionEntry(c)
-    let realModule = c.graph.importModuleCallback(c.graph, c.module, f)
+    realModule = c.graph.importModuleCallback(c.graph, c.module, f)
     result = importModuleAs(c, n, realModule, transf.importHidden, trackUnusedImport)
     popOptionEntry(c)
 

compiler/lexer.nim

@@ -316,28 +316,6 @@ proc getNumber(L: var Lexer, result: var Token) =
     L.bufpos = msgPos
     lexMessage(L, msgKind, msg % t.literal)
 
-  proc checkBitWidth(L: var Lexer, base: NumericalBase, tokType: TokType, 
-                     numDigits: int, startpos: int) =
-    # Check bit width for non-base-10 literals
-    # Warn if the digit count exceeds what can fit in the target type
-    let bitsPerDigit = case base
-      of base2: 1
-      of base8: 3
-      of base16: 4
-      else: raiseAssert "unreachable"
-    let bitWidth = case tokType
-      of tkInt8Lit, tkUInt8Lit: 8
-      of tkInt16Lit, tkUInt16Lit: 16
-      of tkInt32Lit, tkUInt32Lit: 32
-      of tkInt64Lit, tkUIntLit, tkIntLit, tkUInt64Lit: 64
-      else: raiseAssert "unreachable"
-    # Maximum digits = ceil(bitWidth / bitsPerDigit) = (bitWidth + bitsPerDigit - 1) div bitsPerDigit
-    let maxDigits = (bitWidth + bitsPerDigit - 1) div bitsPerDigit
-    if numDigits > maxDigits:
-      lexMessageLitNum(L,
-        "number has " & $numDigits & " digits but type only supports " &
-        $maxDigits & " digits: '$1'", startpos, warnLongLiterals)
-
   var
     xi: BiggestInt
     isBase10 = true
@@ -513,11 +491,6 @@ proc getNumber(L: var Lexer, result: var Token) =
           setNumber result.fNumber, (cast[ptr float64](addr(xi)))[]
         else: internalError(L.config, getLineInfo(L), "getNumber")
 
-        # Check bit width for non-base-10 literals
-        # Warn if the digit count exceeds what can fit in the target type
-        if result.base != base10 and result.tokType in {tkIntLit..tkUInt64Lit} and numDigits > 0:
-          checkBitWidth(L, result.base, result.tokType, numDigits, startpos)
-
         # Bounds checks. Non decimal literals are allowed to overflow the range of
         # the datatype as long as their pattern don't overflow _bitwise_, hence
         # below checks of signed sizes against uint*.high is deliberate:
@@ -923,7 +896,7 @@ proc getSymbol(L: var Lexer, tok: var Token) =
     tok.tokType = tkSymbol
   else:
     tok.tokType = TokType(tok.ident.id + ord(tkSymbol))
-    if suspicious and {optStyleHint, optStyleError, optStyleWarning} * L.config.globalOptions != {}:
+    if suspicious and {optStyleHint, optStyleError} * L.config.globalOptions != {}:
       lintReport(L.config, getLineInfo(L), tok.ident.s.normalize, tok.ident.s)
   L.bufpos = pos
 

compiler/lineinfos.nim

@@ -93,12 +93,10 @@ type
     warnBareExcept = "BareExcept",
     warnImplicitDefaultValue = "ImplicitDefaultValue",
     warnIgnoredSymbolInjection = "IgnoredSymbolInjection",
-    warnStdPrefix = "StdPrefix",
-    warnUnknownNotes = "UnknownNotes",
-    warnLongLiterals = "LongLiterals",
+    warnStdPrefix = "StdPrefix"
+    warnUnknownNotes = "UnknownNotes"
     warnUser = "User",
     warnGlobalVarConstructorTemporary = "GlobalVarConstructorTemporary",
-    warnImplicitRangeConversion = "ImplicitRangeConversion",
     # hints
     hintSuccess = "Success", hintSuccessX = "SuccessX",
     hintCC = "CC",
@@ -204,10 +202,8 @@ const
     warnIgnoredSymbolInjection: "$1",
     warnStdPrefix: "$1 needs the 'std' prefix",
     warnUnknownNotes: "$1",
-    warnLongLiterals: "$1",
     warnUser: "$1",
     warnGlobalVarConstructorTemporary: "global variable '$1' initialization requires a temporary variable",
-    warnImplicitRangeConversion: "implicit range conversion $1",
     hintSuccess: "operation successful: $#",
     # keep in sync with `testament.isSuccess`
     hintSuccessX: "$build\n$loc lines; ${sec}s; $mem; proj: $project; out: $output",
@@ -262,7 +258,7 @@ type
 
 proc computeNotesVerbosity(): array[0..3, TNoteKinds] =
   result = default(array[0..3, TNoteKinds])
-  result[3] = {low(TNoteKind)..high(TNoteKind)} - {warnObservableStores, warnResultUsed, warnAnyEnumConv, warnBareExcept, warnStdPrefix, warnImplicitRangeConversion}
+  result[3] = {low(TNoteKind)..high(TNoteKind)} - {warnObservableStores, warnResultUsed, warnAnyEnumConv, warnBareExcept, warnStdPrefix}
   result[2] = result[3] - {hintStackTrace, hintExtendedContext, hintDeclaredLoc, hintProcessingStmt}
   result[1] = result[2] - {warnProveField, warnProveIndex,
     warnGcUnsafe, hintPath, hintDependency, hintCodeBegin, hintCodeEnd,

compiler/linter.nim

@@ -95,7 +95,7 @@ proc nep1CheckDefImpl(conf: ConfigRef; info: TLineInfo; s: PSym; k: TSymKind) =
 template styleCheckDef*(ctx: PContext; info: TLineInfo; sym: PSym; k: TSymKind) =
   ## Check symbol definitions adhere to NEP1 style rules.
   if optStyleCheck in ctx.config.options and # ignore if styleChecks are off
-     {optStyleHint, optStyleError, optStyleWarning} * ctx.config.globalOptions != {} and # check only if hint/error/warning is enabled
+     {optStyleHint, optStyleError} * ctx.config.globalOptions != {} and # check only if hint/error is enabled
      hintName in ctx.config.notes and # ignore if name checks are not requested
      ctx.config.belongsToProjectPackageMaybeNil(getModule(ctx.graph, info.fileIndex)) and # ignore foreign packages
      optStyleUsages notin ctx.config.globalOptions and # ignore if requested to only check name usage
@@ -136,7 +136,7 @@ proc styleCheckUseImpl(conf: ConfigRef; info: TLineInfo; s: PSym) =
 
 template styleCheckUse*(ctx: PContext; info: TLineInfo; sym: PSym) =
   ## Check symbol uses match their definition's style.
-  if {optStyleHint, optStyleError, optStyleWarning} * ctx.config.globalOptions != {} and # ignore if styleChecks are off
+  if {optStyleHint, optStyleError} * ctx.config.globalOptions != {} and # ignore if styleChecks are off
      hintName in ctx.config.notes and # ignore if name checks are not requested
      ctx.config.belongsToProjectPackageMaybeNil(getModule(ctx.graph, info.fileIndex)) and # ignore foreign packages
      sym.kind != skTemp and # ignore temporary variables created by the compiler
@@ -152,7 +152,7 @@ proc checkPragmaUseImpl(conf: ConfigRef; info: TLineInfo; w: TSpecialWord; pragm
 template checkPragmaUse*(ctx: PContext; info: TLineInfo; w: TSpecialWord; pragmaName: string, sym: PSym) =
   ## Check builtin pragma uses match their definition's style.
   ## Note: This only applies to builtin pragmas, not user pragmas.
-  if {optStyleHint, optStyleError, optStyleWarning} * ctx.config.globalOptions != {} and # ignore if styleChecks are off
+  if {optStyleHint, optStyleError} * ctx.config.globalOptions != {} and # ignore if styleChecks are off
      hintName in ctx.config.notes and # ignore if name checks are not requested
      ctx.config.belongsToProjectPackageMaybeNil(getModule(ctx.graph, info.fileIndex)): # ignore foreign packages
     checkPragmaUseImpl(ctx.config, info, w, pragmaName)

compiler/lookups.nim

@@ -412,6 +412,8 @@ proc addDecl*(c: PContext, sym: PSym) {.inline.} =
 proc addPrelimDecl*(c: PContext, sym: PSym) =
   discard c.currentScope.addUniqueSym(sym)
 
+from ic / ic import addHidden
+
 proc addInterfaceDeclAux(c: PContext, sym: PSym) =
   ## adds symbol to the module for either private or public access.
   if sfExported in sym.flags:
@@ -420,6 +422,8 @@ proc addInterfaceDeclAux(c: PContext, sym: PSym) =
     else: internalError(c.config, sym.info, "addInterfaceDeclAux")
   elif sym.kind in ExportableSymKinds and c.module != nil and isTopLevelInsideDeclaration(c, sym):
     strTableAdd(semtabAll(c.graph, c.module), sym)
+    if c.config.symbolFiles != disabledSf:
+      addHidden(c.encoder, c.packedRepr, sym)
 
 proc addInterfaceDeclAt*(c: PContext, scope: PScope, sym: PSym) =
   ## adds a symbol on the scope and the interface if appropriate

compiler/main.nim

@@ -26,6 +26,8 @@ import
 when defined(nimPreviewSlimSystem):
   import std/[syncio, assertions]
 
+import ic / [cbackend, integrity, navigator, ic]
+
 import ../dist/checksums/src/checksums/sha1
 
 import pipelines
@@ -97,6 +99,14 @@ proc commandCheck(graph: ModuleGraph) =
   setPipeLinePass(graph, SemPass)
   compilePipelineProject(graph)
 
+  if conf.symbolFiles != disabledSf:
+    case conf.ideCmd
+    of ideDef: navDefinition(graph)
+    of ideUse: navUsages(graph)
+    of ideDus: navDefusages(graph)
+    else: discard
+    writeRodFiles(graph)
+
 when not defined(leanCompiler):
   proc commandDoc2(graph: ModuleGraph; ext: string) =
     handleDocOutputOptions graph.config
@@ -163,7 +173,15 @@ proc commandCompileToC(graph: ModuleGraph) =
   compilePipelineProject(graph)
   if graph.config.errorCounter > 0:
     return # issue #9933
-  cgenWriteModules(graph.backend, conf)
+  if conf.symbolFiles == disabledSf:
+    cgenWriteModules(graph.backend, conf)
+  else:
+    if isDefined(conf, "nimIcIntegrityChecks"):
+      checkIntegrity(graph)
+    generateCode(graph)
+    # graph.backend can be nil under IC when nothing changed at all:
+    if graph.backend != nil:
+      cgenWriteModules(graph.backend, conf)
   if conf.cmd != cmdTcc and graph.backend != nil:
     extccomp.callCCompiler(conf)
     # for now we do not support writing out a .json file with the build instructions when HCR is on
@@ -223,6 +241,10 @@ proc commandScan(cache: IdentCache, config: ConfigRef) =
   else:
     rawMessage(config, errGenerated, "cannot open file: " & f.string)
 
+proc commandView(graph: ModuleGraph) =
+  let f = toAbsolute(mainCommandArg(graph.config), AbsoluteDir getCurrentDir()).addFileExt(RodExt)
+  rodViewer(f, graph.config, graph.cache)
+
 const
   PrintRopeCacheStats = false
 
@@ -320,6 +342,8 @@ proc mainCommand*(graph: ModuleGraph) =
   case conf.cmd
   of cmdBackends:
     compileToBackend()
+    when BenchIC:
+      echoTimes graph.packed
   of cmdTcc:
     when hasTinyCBackend:
       extccomp.setCC(conf, "tcc", unknownLineInfo)
@@ -437,6 +461,10 @@ proc mainCommand*(graph: ModuleGraph) =
   of cmdParse:
     wantMainModule(conf)
     discard parseFile(conf.projectMainIdx, cache, conf)
+  of cmdRod:
+    wantMainModule(conf)
+    commandView(graph)
+    #msgWriteln(conf, "Beware: Indentation tokens depend on the parser's state!")
   of cmdInteractive: commandInteractive(graph)
   of cmdNimscript:
     if conf.projectIsCmd or conf.projectIsStdin: discard

compiler/modulegraphs.nim

@@ -14,6 +14,7 @@
 import std/[intsets, tables, hashes, strtabs, os, strutils, parseutils]
 import ../dist/checksums/src/checksums/md5
 import ast, astalgo, options, lineinfos,idents, btrees, ropes, msgs, pathutils, packages, suggestsymdb
+import ic / [packed_ast, ic]
 
 when not defined(nimKochBootstrap):
   import ast2nif
@@ -27,12 +28,16 @@ when defined(nimPreviewSlimSystem):
 type
   SigHash* = distinct MD5Digest
 
+  LazySym* = object
+    id*: FullId
+    sym*: PSym
+
   Iface* = object       ## data we don't want to store directly in the
                         ## ast.PSym type for s.kind == skModule
     module*: PSym       ## module this "Iface" belongs to
-    converters*: seq[PSym]
-    patterns*: seq[PSym]
-    pureEnums*: seq[PSym]
+    converters*: seq[LazySym]
+    patterns*: seq[LazySym]
+    pureEnums*: seq[LazySym]
     interf: TStrTable
     interfHidden: TStrTable
     uniqueName*: Rope
@@ -41,6 +46,20 @@ type
     opNot*, opContains*, opLe*, opLt*, opAnd*, opOr*, opIsNil*, opEq*: PSym
     opAdd*, opSub*, opMul*, opDiv*, opLen*: PSym
 
+  FullId* = object
+    module*: int
+    packed*: PackedItemId
+
+  LazyType* = object
+    id*: FullId
+    typ*: PType
+
+  LazyInstantiation* = object
+    module*: int
+    sym*: FullId
+    concreteTypes*: seq[FullId]
+    inst*: PInstantiation
+
   PipelinePass* = enum
     NonePass
     SemPass
@@ -56,18 +75,21 @@ type
 
   ModuleGraph* {.acyclic.} = ref object
     ifaces*: seq[Iface]  ## indexed by int32 fileIdx
+    packed*: PackedModuleGraph
+    encoders*: seq[PackedEncoder]
 
-    typeInstCache*: Table[ItemId, seq[PType]] # A symbol's ItemId.
-    procInstCache*: Table[ItemId, seq[PInstantiation]] # A symbol's ItemId.
-    attachedOps*: array[TTypeAttachedOp, Table[ItemId, PSym]] # Type ID, destructors, etc.
+    typeInstCache*: Table[ItemId, seq[LazyType]] # A symbol's ItemId.
+    procInstCache*: Table[ItemId, seq[LazyInstantiation]] # A symbol's ItemId.
+    attachedOps*: array[TTypeAttachedOp, Table[ItemId, LazySym]] # Type ID, destructors, etc.
     loadedOps: array[TTypeAttachedOp, Table[string, PSym]] # This can later by unified with `attachedOps` once it's stable
     opsLog*: seq[LogEntry]
-    methodsPerGenericType*: Table[ItemId, seq[(int, PSym)]] # Type ID, attached methods
+    methodsPerGenericType*: Table[ItemId, seq[(int, LazySym)]] # Type ID, attached methods
     memberProcsPerType*: Table[ItemId, seq[PSym]] # Type ID, attached member procs (only c++, virtual,member and ctor so far).
     initializersPerType*: Table[ItemId, PNode] # Type ID, AST call to the default ctor (c++ only)
-    enumToStringProcs*: Table[ItemId, PSym]
+    enumToStringProcs*: Table[ItemId, LazySym]
     emittedTypeInfo*: Table[string, FileIndex]
 
+    startupPackedConfig*: PackedConfig
     packageSyms*: TStrTable
     deps*: IntSet # the dependency graph or potentially its transitive closure.
     importDeps*: Table[FileIndex, seq[FileIndex]] # explicit import module dependencies
@@ -93,8 +115,8 @@ type
     methods*: seq[tuple[methods: seq[PSym], dispatcher: PSym]] # needs serialization!
     bucketTable*: CountTable[ItemId]
     objectTree*: Table[ItemId, seq[tuple[depth: int, value: PType]]]
-    methodsPerType*: Table[ItemId, seq[PSym]]
-    dispatchers*: seq[PSym]
+    methodsPerType*: Table[ItemId, seq[LazySym]]
+    dispatchers*: seq[LazySym]
 
     systemModule*: PSym
     sysTypes*: array[TTypeKind, PType]
@@ -124,7 +146,6 @@ type
 
     procGlobals*: seq[PNode]
     nifReplayActions*: Table[int32, seq[PNode]]  # module position -> replay actions for NIF
-    cachedMods: IntSet
 
   TPassContext* = object of RootObj # the pass's context
     idgen*: IdGenerator
@@ -207,43 +228,85 @@ proc strTableAdds*(g: ModuleGraph, m: PSym, s: PSym) =
   strTableAdd(semtabAll(g, m), s)
 
 proc isCachedModule(g: ModuleGraph; module: int): bool {.inline.} =
-  result = module in g.cachedMods
+  result = module < g.packed.len and g.packed[module].status == loaded
 
 proc isCachedModule*(g: ModuleGraph; m: PSym): bool {.inline.} =
   isCachedModule(g, m.position)
 
+proc simulateCachedModule(g: ModuleGraph; moduleSym: PSym; m: PackedModule) =
+  when false:
+    echo "simulating ", moduleSym.name.s, " ", moduleSym.position
+  simulateLoadedModule(g.packed, g.config, g.cache, moduleSym, m)
+
+proc initEncoder*(g: ModuleGraph; module: PSym) =
+  let id = module.position
+  if id >= g.encoders.len:
+    setLen g.encoders, id+1
+  ic.initEncoder(g.encoders[id],
+    g.packed[id].fromDisk, module, g.config, g.startupPackedConfig)
+
 type
   ModuleIter* = object
+    fromRod: bool
     modIndex: int
     ti: TIdentIter
+    rodIt: RodIter
     importHidden: bool
 
 proc initModuleIter*(mi: var ModuleIter; g: ModuleGraph; m: PSym; name: PIdent): PSym =
   assert m.kind == skModule
   mi.modIndex = m.position
+  mi.fromRod = isCachedModule(g, mi.modIndex)
   mi.importHidden = optImportHidden in m.options
-  result = initIdentIter(mi.ti, g.ifaces[mi.modIndex].interfSelect(mi.importHidden), name)
+  if mi.fromRod:
+    result = initRodIter(mi.rodIt, g.config, g.cache, g.packed, FileIndex mi.modIndex, name, mi.importHidden)
+  else:
+    result = initIdentIter(mi.ti, g.ifaces[mi.modIndex].interfSelect(mi.importHidden), name)
 
 proc nextModuleIter*(mi: var ModuleIter; g: ModuleGraph): PSym =
-  result = nextIdentIter(mi.ti, g.ifaces[mi.modIndex].interfSelect(mi.importHidden))
+  if mi.fromRod:
+    result = nextRodIter(mi.rodIt, g.packed)
+  else:
+    result = nextIdentIter(mi.ti, g.ifaces[mi.modIndex].interfSelect(mi.importHidden))
 
 iterator allSyms*(g: ModuleGraph; m: PSym): PSym =
   let importHidden = optImportHidden in m.options
-  for s in g.ifaces[m.position].interfSelect(importHidden).data:
-    if s != nil:
-      yield s
+  if isCachedModule(g, m):
+    var rodIt: RodIter = default(RodIter)
+    var r = initRodIterAllSyms(rodIt, g.config, g.cache, g.packed, FileIndex m.position, importHidden)
+    while r != nil:
+      yield r
+      r = nextRodIter(rodIt, g.packed)
+  else:
+    for s in g.ifaces[m.position].interfSelect(importHidden).data:
+      if s != nil:
+        yield s
 
 proc someSym*(g: ModuleGraph; m: PSym; name: PIdent): PSym =
   let importHidden = optImportHidden in m.options
-  result = strTableGet(g.ifaces[m.position].interfSelect(importHidden), name)
+  if isCachedModule(g, m):
+    result = interfaceSymbol(g.config, g.cache, g.packed, FileIndex(m.position), name, importHidden)
+  else:
+    result = strTableGet(g.ifaces[m.position].interfSelect(importHidden), name)
 
 proc someSymAmb*(g: ModuleGraph; m: PSym; name: PIdent; amb: var bool): PSym =
   let importHidden = optImportHidden in m.options
-  var ti: TIdentIter = default(TIdentIter)
-  result = initIdentIter(ti, g.ifaces[m.position].interfSelect(importHidden), name)
-  if result != nil and nextIdentIter(ti, g.ifaces[m.position].interfSelect(importHidden)) != nil:
-    # another symbol exists with same name
-    amb = true
+  if isCachedModule(g, m):
+    result = nil
+    for s in interfaceSymbols(g.config, g.cache, g.packed, FileIndex(m.position), name, importHidden):
+      if result == nil:
+        # set result to the first symbol
+        result = s
+      else:
+        # another symbol found
+        amb = true
+        break
+  else:
+    var ti: TIdentIter = default(TIdentIter)
+    result = initIdentIter(ti, g.ifaces[m.position].interfSelect(importHidden), name)
+    if result != nil and nextIdentIter(ti, g.ifaces[m.position].interfSelect(importHidden)) != nil:
+      # another symbol exists with same name
+      amb = true
 
 proc systemModuleSym*(g: ModuleGraph; name: PIdent): PSym =
   result = someSym(g, g.systemModule, name)
@@ -255,24 +318,56 @@ iterator systemModuleSyms*(g: ModuleGraph; name: PIdent): PSym =
     yield r
     r = nextModuleIter(mi, g)
 
+proc resolveType(g: ModuleGraph; t: var LazyType): PType =
+  result = t.typ
+  if result == nil and isCachedModule(g, t.id.module):
+    result = loadTypeFromId(g.config, g.cache, g.packed, t.id.module, t.id.packed)
+    t.typ = result
+  assert result != nil
+
+proc resolveSym(g: ModuleGraph; t: var LazySym): PSym =
+  result = t.sym
+  if result == nil and isCachedModule(g, t.id.module):
+    result = loadSymFromId(g.config, g.cache, g.packed, t.id.module, t.id.packed)
+    t.sym = result
+  assert result != nil
+
+proc resolveInst(g: ModuleGraph; t: var LazyInstantiation): PInstantiation =
+  result = t.inst
+  if result == nil and isCachedModule(g, t.module):
+    result = PInstantiation(sym: loadSymFromId(g.config, g.cache, g.packed, t.sym.module, t.sym.packed))
+    result.concreteTypes = newSeq[PType](t.concreteTypes.len)
+    for i in 0..high(result.concreteTypes):
+      result.concreteTypes[i] = loadTypeFromId(g.config, g.cache, g.packed,
+          t.concreteTypes[i].module, t.concreteTypes[i].packed)
+    t.inst = result
+  assert result != nil
+
+proc resolveAttachedOp*(g: ModuleGraph; t: var LazySym): PSym =
+  result = t.sym
+  if result == nil:
+    result = loadSymFromId(g.config, g.cache, g.packed, t.id.module, t.id.packed)
+    t.sym = result
+  assert result != nil
+
 iterator typeInstCacheItems*(g: ModuleGraph; s: PSym): PType =
   if g.typeInstCache.contains(s.itemId):
     let x = addr(g.typeInstCache[s.itemId])
     for t in mitems(x[]):
-      yield t
+      yield resolveType(g, t)
 
 iterator procInstCacheItems*(g: ModuleGraph; s: PSym): PInstantiation =
   if g.procInstCache.contains(s.itemId):
     let x = addr(g.procInstCache[s.itemId])
     for t in mitems(x[]):
-      yield t
+      yield resolveInst(g, t)
 
 
 proc getAttachedOp*(g: ModuleGraph; t: PType; op: TTypeAttachedOp): PSym =
   ## returns the requested attached operation for type `t`. Can return nil
   ## if no such operation exists.
   if g.attachedOps[op].contains(t.itemId):
-    result = g.attachedOps[op][t.itemId]
+    result = resolveAttachedOp(g, g.attachedOps[op][t.itemId])
   elif g.config.cmd in {cmdNifC, cmdM}:
     # Fall back to key-based lookup for NIF-loaded hooks
     let key = typeKey(t, g.config, loadTypeCallback, loadSymCallback)
@@ -293,32 +388,36 @@ proc setAttachedOp*(g: ModuleGraph; module: int; t: PType; op: TTypeAttachedOp;
       let ownerModule = if t.sym != nil: t.sym.itemId.module.int else: module
       g.opsLog.add LogEntry(kind: HookEntry, op: op, module: ownerModule, key: key, sym: value)
       g.loadedOps[op][key] = value
-  g.attachedOps[op][t.itemId] = value
+  g.attachedOps[op][t.itemId] = LazySym(sym: value)
 
 proc setAttachedOp*(g: ModuleGraph; module: int; typeId: ItemId; op: TTypeAttachedOp; value: PSym) =
   ## Overload that takes ItemId directly, useful for registering hooks from NIF index.
-  g.attachedOps[op][typeId] = value
+  g.attachedOps[op][typeId] = LazySym(sym: value)
 
 proc setAttachedOpPartial*(g: ModuleGraph; module: int; t: PType; op: TTypeAttachedOp; value: PSym) =
   ## we also need to record this to the packed module.
-  g.attachedOps[op][t.itemId] = value
+  g.attachedOps[op][t.itemId] = LazySym(sym: value)
 
-proc completePartialOp*(g: ModuleGraph; module: int; t: PType; op: TTypeAttachedOp; value: PSym) {.inline.} =
-  discard
+proc completePartialOp*(g: ModuleGraph; module: int; t: PType; op: TTypeAttachedOp; value: PSym) =
+  if g.config.symbolFiles != disabledSf:
+    assert module < g.encoders.len
+    assert isActive(g.encoders[module])
+    toPackedGeneratedProcDef(value, g.encoders[module], g.packed[module].fromDisk)
+    #storeAttachedProcDef(t, op, value, g.encoders[module], g.packed[module].fromDisk)
 
 iterator getDispatchers*(g: ModuleGraph): PSym =
   for i in g.dispatchers.mitems:
-    yield i
+    yield resolveSym(g, i)
 
 proc addDispatchers*(g: ModuleGraph, value: PSym) =
   # TODO: add it for packed modules
-  g.dispatchers.add value
+  g.dispatchers.add LazySym(sym: value)
 
-iterator resolveLazySymSeq(g: ModuleGraph, list: var seq[PSym]): PSym =
+iterator resolveLazySymSeq(g: ModuleGraph, list: var seq[LazySym]): PSym =
   for it in list.mitems:
-    yield it
+    yield resolveSym(g, it)
 
-proc setMethodsPerType*(g: ModuleGraph; id: ItemId, methods: seq[PSym]) =
+proc setMethodsPerType*(g: ModuleGraph; id: ItemId, methods: seq[LazySym]) =
   # TODO: add it for packed modules
   g.methodsPerType[id] = methods
 
@@ -329,14 +428,14 @@ proc addNifReplayAction*(g: ModuleGraph; module: int32; n: PNode) =
 iterator getMethodsPerType*(g: ModuleGraph; t: PType): PSym =
   if g.methodsPerType.contains(t.itemId):
     for it in mitems g.methodsPerType[t.itemId]:
-      yield it
+      yield resolveSym(g, it)
 
 proc getToStringProc*(g: ModuleGraph; t: PType): PSym =
-  result = g.enumToStringProcs[t.itemId]
+  result = resolveSym(g, g.enumToStringProcs[t.itemId])
   assert result != nil
 
 proc setToStringProc*(g: ModuleGraph; t: PType; value: PSym) =
-  g.enumToStringProcs[t.itemId] = value
+  g.enumToStringProcs[t.itemId] = LazySym(sym: value)
   let key = typeKey(t, g.config, loadTypeCallback, loadSymCallback)
   let ownerModule = if t.sym != nil: t.sym.itemId.module.int else: value.itemId.module.int
   g.opsLog.add LogEntry(kind: EnumToStrEntry, module: ownerModule, key: key, sym: value)
@@ -344,10 +443,10 @@ proc setToStringProc*(g: ModuleGraph; t: PType; value: PSym) =
 iterator methodsForGeneric*(g: ModuleGraph; t: PType): (int, PSym) =
   if g.methodsPerGenericType.contains(t.itemId):
     for it in mitems g.methodsPerGenericType[t.itemId]:
-      yield (it[0], it[1])
+      yield (it[0], resolveSym(g, it[1]))
 
 proc addMethodToGeneric*(g: ModuleGraph; module: int; t: PType; col: int; m: PSym) =
-  g.methodsPerGenericType.mgetOrPut(t.itemId, @[]).add (col, m)
+  g.methodsPerGenericType.mgetOrPut(t.itemId, @[]).add (col, LazySym(sym: m))
   let key = typeKey(t, g.config, loadTypeCallback, loadSymCallback)
   let ownerModule = if t.sym != nil: t.sym.itemId.module.int else: module
   g.opsLog.add LogEntry(kind: MethodEntry, module: ownerModule, key: key, sym: m)
@@ -375,12 +474,11 @@ proc loadCompilerProc*(g: ModuleGraph; name: string): PSym =
   if g.config.symbolFiles == disabledSf and optWithinConfigSystem notin g.config.globalOptions:
     # For NIF-based compilation, search in loaded NIF modules
     when not defined(nimKochBootstrap):
-      # Try to resolve from NIF for both cmdNifC and cmdM (which uses NIF files)
-      if g.config.cmd in {cmdNifC, cmdM}:
+      # Only try to resolve from NIF if we're actually using NIF files (cmdNifC)
+      if g.config.cmd == cmdNifC:
         # First try system module (most compilerprocs are there)
         let systemFileIdx = g.config.m.systemFileIdx
-        if systemFileIdx != InvalidFileIdx and not g.withinSystem:
-          # Only try to load from NIF if the file exists (it may not during initial ic build)
+        if systemFileIdx != InvalidFileIdx:
           result = tryResolveCompilerProc(ast.program, name, systemFileIdx)
           if result != nil:
             strTableAdd(g.compilerprocs, result)
@@ -398,6 +496,20 @@ proc loadCompilerProc*(g: ModuleGraph; name: string): PSym =
               return result
     return nil
 
+  # slow, linear search, but the results are cached:
+  for module in 0..<len(g.packed):
+    #if isCachedModule(g, module):
+    let x = searchForCompilerproc(g.packed[module], name)
+    if x >= 0:
+      result = loadSymFromId(g.config, g.cache, g.packed, module, toPackedItemId(x))
+      if result != nil:
+        strTableAdd(g.compilerprocs, result)
+      return result
+
+proc loadPackedSym*(g: ModuleGraph; s: var LazySym) =
+  if s.sym == nil:
+    s.sym = loadSymFromId(g.config, g.cache, g.packed, s.id.module, s.id.packed)
+
 proc `$`*(u: SigHash): string =
   toBase64a(cast[cstring](unsafeAddr u), sizeof(u))
 
@@ -484,13 +596,16 @@ proc registerModule*(g: ModuleGraph; m: PSym) =
   if m.position >= g.ifaces.len:
     setLen(g.ifaces, m.position + 1)
 
+  if m.position >= g.packed.len:
+    setLen(g.packed.pm, m.position + 1)
+
   if g.ifaces[m.position].module == nil:
     g.ifaces[m.position] = Iface(module: m, converters: @[], patterns: @[],
                                 uniqueName: rope(uniqueModuleName(g.config, m)))
     initStrTables(g, m)
 
 proc registerModuleById*(g: ModuleGraph; m: FileIndex) =
-  registerModule(g, g.ifaces[int m].module)
+  registerModule(g, g.packed[int m].module)
 
 proc initOperators*(g: ModuleGraph): Operators =
   # These are safe for IC.
@@ -537,7 +652,6 @@ proc initModuleGraphFields(result: ModuleGraph) =
   result.operators = initOperators(result)
   result.emittedTypeInfo = initTable[string, FileIndex]()
   result.cachedFiles = newStringTable()
-  result.cachedMods = initIntSet()
 
 proc newModuleGraph*(cache: IdentCache; config: ConfigRef): ModuleGraph =
   result = ModuleGraph()
@@ -560,13 +674,49 @@ proc resetAllModules*(g: ModuleGraph) =
   initModuleGraphFields(g)
 
 proc getModule*(g: ModuleGraph; fileIdx: FileIndex): PSym =
-  if fileIdx.int32 >= 0 and fileIdx.int32 < g.ifaces.len:
-    result = g.ifaces[fileIdx.int32].module
-  else:
-    result = nil
+  result = nil
+  if fileIdx.int32 >= 0:
+    if isCachedModule(g, fileIdx.int32):
+      result = g.packed[fileIdx.int32].module
+    elif fileIdx.int32 < g.ifaces.len:
+      result = g.ifaces[fileIdx.int32].module
 
 proc moduleOpenForCodegen*(g: ModuleGraph; m: FileIndex): bool {.inline.} =
-  result = true
+  if g.config.symbolFiles == disabledSf:
+    result = true
+  else:
+    result = g.packed[m.int32].status notin {undefined, stored, loaded}
+
+proc rememberEmittedTypeInfo*(g: ModuleGraph; m: FileIndex; ti: string) =
+  #assert(not isCachedModule(g, m.int32))
+  if g.config.symbolFiles != disabledSf:
+    #assert g.encoders[m.int32].isActive
+    assert g.packed[m.int32].status != stored
+    g.packed[m.int32].fromDisk.emittedTypeInfo.add ti
+    #echo "added typeinfo ", m.int32, " ", ti, " suspicious ", not g.encoders[m.int32].isActive
+
+proc rememberFlag*(g: ModuleGraph; m: PSym; flag: ModuleBackendFlag) =
+  if g.config.symbolFiles != disabledSf:
+    #assert g.encoders[m.int32].isActive
+    assert g.packed[m.position].status != stored
+    g.packed[m.position].fromDisk.backendFlags.incl flag
+
+proc closeRodFile*(g: ModuleGraph; m: PSym) =
+  if g.config.symbolFiles in {readOnlySf, v2Sf}:
+    # For stress testing we seek to reload the symbols from memory. This
+    # way much of the logic is tested but the test is reproducible as it does
+    # not depend on the hard disk contents!
+    let mint = m.position
+    saveRodFile(toRodFile(g.config, AbsoluteFile toFullPath(g.config, FileIndex(mint))),
+                g.encoders[mint], g.packed[mint].fromDisk)
+    g.packed[mint].status = stored
+
+  elif g.config.symbolFiles == stressTest:
+    # debug code, but maybe a good idea for production? Could reduce the compiler's
+    # memory consumption considerably at the cost of more loads from disk.
+    let mint = m.position
+    simulateCachedModule(g, m, g.packed[mint].fromDisk)
+    g.packed[mint].status = loaded
 
 proc dependsOn(a, b: int): int {.inline.} = (a shl 15) + b
 
@@ -650,8 +800,19 @@ proc needsCompilation*(g: ModuleGraph, fileIdx: FileIndex): bool =
 
 proc getBody*(g: ModuleGraph; s: PSym): PNode {.inline.} =
   result = s.ast[bodyPos]
+  if result == nil and g.config.symbolFiles in {readOnlySf, v2Sf, stressTest}:
+    result = loadProcBody(g.config, g.cache, g.packed, s)
+    s.ast[bodyPos] = result
   assert result != nil
 
+proc moduleFromRodFile*(g: ModuleGraph; fileIdx: FileIndex;
+                        cachedModules: var seq[FileIndex]): PSym =
+  ## Returns 'nil' if the module needs to be recompiled.
+  if g.config.symbolFiles in {readOnlySf, v2Sf, stressTest}:
+    result = moduleFromRodFile(g.packed, g.config, g.cache, fileIdx, cachedModules)
+  else:
+    result = nil
+
 when not defined(nimKochBootstrap):
   proc moduleFromNifFile*(g: ModuleGraph; fileIdx: FileIndex;
                           flags: set[LoadFlag] = {}): PrecompiledModule =
@@ -679,16 +840,13 @@ when not defined(nimKochBootstrap):
                            g.ifaces[fileIdx.int].interfHidden, flags)
     result.module = m
 
-    # Mark module as cached
-    g.cachedMods.incl fileIdx.int
-
     # Register hooks from NIF index with the module graph
     for x in result.logOps:
       case x.kind
       of HookEntry:
         g.loadedOps[x.op][x.key] = x.sym
       of ConverterEntry:
-        g.ifaces[fileIdx.int].converters.add x.sym
+        g.ifaces[fileIdx.int].converters.add LazySym(sym: x.sym)
       of MethodEntry:
         discard "todo"
       of EnumToStrEntry:
@@ -699,10 +857,9 @@ when not defined(nimKochBootstrap):
     discard "todo"
 
 proc configComplete*(g: ModuleGraph) =
-  #rememberStartupConfig(g.startupPackedConfig, g.config)
-  discard
+  rememberStartupConfig(g.startupPackedConfig, g.config)
 
-proc onProcessing*(graph: ModuleGraph, fileIdx: FileIndex, moduleStatus: string, fromModule: PSym) =
+proc onProcessing*(graph: ModuleGraph, fileIdx: FileIndex, moduleStatus: string, fromModule: PSym, ) =
   let conf = graph.config
   let isNimscript = conf.isDefined("nimscript")
   if (not isNimscript) or hintProcessing in conf.cmdlineNotes:

compiler/modulepaths.nim

@@ -109,11 +109,9 @@ proc mangleModuleName*(conf: ConfigRef; path: AbsoluteFile): string =
     of FromSearchPath: "@p"
     of FromNimblePath: "@n"
 
-  # Note: We encode ".." specially as "@d" to avoid issues with changeFileExt
-  # which would misinterpret ".." as "name.ext" and strip the second part.
   prefix & best.multiReplace(
-    {"..": "@d", $os.DirSep: "@s", $os.AltSep: "@s", "#": "@h", "@": "@@", ":": "@c"})
+    {$os.DirSep: "@s", $os.AltSep: "@s", "#": "@h", "@": "@@", ":": "@c"})
 
 proc demangleModuleName*(path: string): string =
   ## Demangle a relative module path.
-  result = path.multiReplace({"@@": "@", "@d": "..", "@h": "#", "@s": "/", "@m": "", "@p": "", "@n": "", "@c": ":"})
+  result = path.multiReplace({"@@": "@", "@h": "#", "@s": "/", "@m": "", "@p": "", "@n": "", "@c": ":"})

compiler/msgs.nim

@@ -664,9 +664,7 @@ template internalAssert*(conf: ConfigRef, e: bool) =
 
 template lintReport*(conf: ConfigRef; info: TLineInfo, beau, got: string, extraMsg = "") =
   let m = "'$1' should be: '$2'$3" % [got, beau, extraMsg]
-  let msg = if optStyleError in conf.globalOptions: errGenerated
-            elif optStyleWarning in conf.globalOptions: warnUser
-            else: hintName
+  let msg = if optStyleError in conf.globalOptions: errGenerated else: hintName
   liMessage(conf, info, msg, m, doNothing, instLoc())
 
 proc quotedFilename*(conf: ConfigRef; fi: FileIndex): Rope =

compiler/options.nim

@@ -68,7 +68,6 @@ type                          # please make sure we have under 32 options
     optUseNimcache,           # save artifacts (including binary) in $nimcache
     optStyleHint,             # check that the names adhere to NEP-1
     optStyleError,            # enforce that the names adhere to NEP-1
-    optStyleWarning,          # emit style checks as warnings
     optStyleUsages,           # only enforce consistent **usages** of the symbol
     optSkipSystemConfigFile,  # skip the system's cfg/nims config file
     optSkipProjConfigFile,    # skip the project's cfg/nims config file
@@ -111,7 +110,6 @@ type                          # please make sure we have under 32 options
     optEnableDeepCopy         # ORC specific: enable 'deepcopy' for all types.
     optShowNonExportedFields  # for documentation: show fields that are not exported
     optJsBigInt64             # use bigints for 64-bit integers in JS
-    optDocRaw                 # for documentation: Don't render markdown for JSON output
     optItaniumMangle          # mangling follows the Itanium spec
     optCompress               # turn on AST compression by converting it to NIF
     optWithinConfigSystem     # we still compile within the configuration system
@@ -157,6 +155,7 @@ type
     cmdCheck # semantic checking for whole project
     cmdM     # only compile a single
     cmdParse # parse a single file (for debugging)
+    cmdRod # .rod to some text representation (for debugging)
     cmdIdeTools # ide tools (e.g. nimsuggest)
     cmdNimscript # evaluate nimscript
     cmdDoc0
@@ -1047,9 +1046,6 @@ proc isDynlibOverride*(conf: ConfigRef; lib: string): bool =
 proc showNonExportedFields*(conf: ConfigRef) =
   incl(conf.globalOptions, optShowNonExportedFields)
 
-proc docRawOutput*(conf: ConfigRef) =
-  incl(conf.globalOptions, optDocRaw)
-
 proc expandDone*(conf: ConfigRef): bool =
   result = conf.ideCmd == ideExpand and conf.expandLevels == 0 and conf.expandProgress
 

compiler/passes.nim

@@ -148,6 +148,11 @@ proc processModule*(graph: ModuleGraph; module: PSym; idgen: IdGenerator;
     closeParser(p)
     if s.kind != llsStdIn: break
   closePasses(graph, a)
+  if graph.config.backend notin {backendC, backendCpp, backendObjc}:
+    # We only write rod files here if no C-like backend is active.
+    # The C-like backends have been patched to support the IC mechanism.
+    # They are responsible for closing the rod files. See `cbackend.nim`.
+    closeRodFile(graph, module)
   result = true
 
 proc compileModule*(graph: ModuleGraph; fileIdx: FileIndex; flags: TSymFlags, fromModule: PSym = nil): PSym =
@@ -163,10 +168,22 @@ proc compileModule*(graph: ModuleGraph; fileIdx: FileIndex; flags: TSymFlags, fr
       elif graph.config.projectIsCmd: s = llStreamOpen(graph.config.cmdInput)
     discard processModule(graph, result, idGeneratorFromModule(result), s)
   if result == nil:
-    result = newModule(graph, fileIdx)
-    result.incl flags
-    registerModule(graph, result)
-    processModuleAux("import")
+    var cachedModules: seq[FileIndex] = @[]
+    result = moduleFromRodFile(graph, fileIdx, cachedModules)
+    let filename = AbsoluteFile toFullPath(graph.config, fileIdx)
+    if result == nil:
+      result = newModule(graph, fileIdx)
+      result.incl flags
+      registerModule(graph, result)
+      processModuleAux("import")
+    else:
+      if sfSystemModule in flags:
+        graph.systemModule = result
+      partialInitModule(result, graph, fileIdx, filename)
+    for m in cachedModules:
+      registerModuleById(graph, m)
+      replayStateChanges(graph.packed.pm[m.int].module, graph)
+      replayGenericCacheInformation(graph, m.int)
   elif graph.isDirty(result):
     result.excl sfDirty
     # reset module fields:

compiler/pipelines.nim

@@ -242,11 +242,8 @@ proc processPipelineModule*(graph: ModuleGraph; module: PSym; idgen: IdGenerator
     raiseAssert "use setPipeLinePass to set a proper PipelinePass"
 
   when not defined(nimKochBootstrap):
-    # For cmdM: only write NIF for the main module, not for imported modules
-    # (imported modules should be loaded from existing NIF files)
-    let shouldWriteNif = (optCompress in graph.config.globalOptions) or
-                         (graph.config.cmd == cmdM and sfMainModule in module.flags)
-    if shouldWriteNif and not graph.config.isDefined("nimscript"):
+    if (optCompress in graph.config.globalOptions or graph.config.cmd == cmdM) and
+       not graph.config.isDefined("nimscript"):
       topLevelStmts.add finalNode
       # Collect replay actions from both pragma computations and VM state diff
       var replayActions: seq[PNode] = @[]
@@ -261,6 +258,12 @@ proc processPipelineModule*(graph: ModuleGraph; module: PSym; idgen: IdGenerator
 
       writeNifModule(graph.config, module.position.int32, topLevelStmts, graph.opsLog, replayActions)
 
+  if graph.config.backend notin {backendC, backendCpp, backendObjc} and graph.config.cmd != cmdM:
+    # We only write rod files here if no C-like backend is active.
+    # The C-like backends have been patched to support the IC mechanism.
+    # They are responsible for closing the rod files. See `cbackend.nim`.
+    # cmdM uses NIF files only, not ROD files.
+    closeRodFile(graph, module)
   result = true
 
 proc compilePipelineModule*(graph: ModuleGraph; fileIdx: FileIndex; flags: TSymFlags; fromModule: PSym = nil): PSym =
@@ -276,6 +279,7 @@ proc compilePipelineModule*(graph: ModuleGraph; fileIdx: FileIndex; flags: TSymF
       elif graph.config.projectIsCmd: s = llStreamOpen(graph.config.cmdInput)
     discard processPipelineModule(graph, result, idGeneratorFromModule(result), s)
   if result == nil:
+    var cachedModules: seq[FileIndex] = @[]
     when not defined(nimKochBootstrap):
       # For cmdM: load imports from NIF files (but compile the main module from source)
       # Skip when withinSystem is true (compiling system.nim itself)
@@ -286,20 +290,13 @@ proc compilePipelineModule*(graph: ModuleGraph; fileIdx: FileIndex; flags: TSymF
         let precomp = moduleFromNifFile(graph, fileIdx)
         if precomp.module == nil:
           let nifPath = toNifFilename(graph.config, fileIdx)
-          globalError(graph.config, unknownLineInfo,
+          localError(graph.config, unknownLineInfo,
             "nim m requires precompiled NIF for import: " & toFullPath(graph.config, fileIdx) &
             " (expected: " & nifPath & ")")
           return nil  # Don't fall through to compile from source
-        else:
-          # Module successfully loaded from NIF file - use it and skip processing
-          result = precomp.module
-          if sfSystemModule in flags:
-            graph.systemModule = result
-          partialInitModule(result, graph, fileIdx, AbsoluteFile(toFullPath(graph.config, fileIdx)))
-          # Replay state changes from the loaded NIF module
-          if result.ast != nil:
-            replayStateChanges(result, graph)
-          return result  # Return early, don't process from source
+    if result == nil and graph.config.cmd != cmdM:
+      # Fall back to ROD file loading (not used for cmdM which uses NIF only)
+      result = moduleFromRodFile(graph, fileIdx, cachedModules)
     let path = toFullPath(graph.config, fileIdx)
     let filename = AbsoluteFile path
     # it could be a stdinfile/cmdfile
@@ -318,6 +315,16 @@ proc compilePipelineModule*(graph: ModuleGraph; fileIdx: FileIndex; flags: TSymF
         registerModule(graph, result)
         processModuleAux("import")
       partialInitModule(result, graph, fileIdx, filename)
+    for m in cachedModules:
+      registerModuleById(graph, m)
+      if graph.config.cmd == cmdM:
+        # cmdM uses NIF files - replay from module AST loaded by loadNifModule
+        let module = graph.getModule(m)
+        if module != nil and module.ast != nil:
+          replayStateChanges(module, graph)
+      else:
+        replayStateChanges(graph.packed.pm[m.int].module, graph)
+        replayGenericCacheInformation(graph, m.int)
   elif graph.isDirty(result):
     result.excl sfDirty
     # reset module fields:
@@ -377,6 +384,7 @@ proc compilePipelineProject*(graph: ModuleGraph; projectFileIdx = InvalidFileIdx
     connectPipelineCallbacks(graph)
     graph.config.m.systemFileIdx = fileInfoIdx(graph.config,
         graph.config.libpath / RelativeFile"system.nim")
+    var cachedModules: seq[FileIndex] = @[]
     when not defined(nimKochBootstrap):
       let precomp = moduleFromNifFile(graph, graph.config.m.systemFileIdx)
       graph.systemModule = precomp.module

compiler/pragmas.nim

@@ -21,6 +21,8 @@ import std/[os, math, strutils]
 when defined(nimPreviewSlimSystem):
   import std/assertions
 
+from ic / ic import addCompilerProc
+
 const
   FirstCallConv* = wNimcall
   LastCallConv* = wNoconv
@@ -765,6 +767,8 @@ proc markCompilerProc(c: PContext; s: PSym) =
   incl(s, sfCompilerProc)
   incl(s.flagsImpl, sfUsed)
   registerCompilerProc(c.graph, s)
+  if c.config.symbolFiles != disabledSf:
+    addCompilerProc(c.encoder, c.packedRepr, s)
 
 proc deprecatedStmt(c: PContext; outerPragma: PNode) =
   let pragma = outerPragma[1]

compiler/renderer.nim

@@ -14,7 +14,7 @@
 {.used.}
 
 import
-  lexer, options, idents, ast, msgs, lineinfos, wordrecg, trees
+  lexer, options, idents, ast, msgs, lineinfos, wordrecg
 
 import std/[strutils]
 
@@ -66,359 +66,6 @@ proc renderTree*(n: PNode, renderFlags: TRenderFlags = {}): string
 # determines how long the subtree will likely be, the second
 # phase appends to a buffer that will be the output.
 
-type
-  TPreferedDesc* = enum
-    preferName, # default
-    preferDesc, # probably should become what preferResolved is
-    preferExported,
-    preferModuleInfo, # fully qualified
-    preferGenericArg,
-    preferTypeName,
-    preferResolved, # fully resolved symbols
-    preferMixed,
-      # most useful, shows: symbol + resolved symbols if it differs, e.g.:
-      # tuple[a: MyInt{int}, b: float]
-    preferInlayHint,
-    preferInferredEffects,
-
-proc typeToString*(typ: PType; prefer: TPreferedDesc = preferName): string
-template `$`*(typ: PType): string = typeToString(typ)
-
-proc valueToString(a: PNode): string =
-  case a.kind
-  of nkCharLit, nkUIntLit..nkUInt64Lit:
-    result = $cast[uint64](a.intVal)
-  of nkIntLit..nkInt64Lit:
-    result = $a.intVal
-  of nkFloatLit..nkFloat128Lit: result = $a.floatVal
-  of nkStrLit..nkTripleStrLit: result = a.strVal
-  of nkStaticExpr: result = "static(" & a[0].renderTree & ")"
-  else: result = "<invalid value>"
-
-proc rangeToStr(n: PNode): string =
-  assert(n.kind == nkRange)
-  result = valueToString(n[0]) & ".." & valueToString(n[1])
-
-const preferToResolveSymbols = {preferName, preferTypeName, preferModuleInfo,
-  preferGenericArg, preferResolved, preferMixed, preferInlayHint, preferInferredEffects}
-
-
-const
-  typeToStr: array[TTypeKind, string] = ["None", "bool", "char", "empty",
-    "Alias", "typeof(nil)", "untyped", "typed", "typeDesc",
-    # xxx typeDesc=>typedesc: typedesc is declared as such, and is 10x more common.
-    "GenericInvocation", "GenericBody", "GenericInst", "GenericParam",
-    "distinct $1", "enum", "ordinal[$1]", "array[$1, $2]", "object", "tuple",
-    "set[$1]", "range[$1]", "ptr ", "ref ", "var ", "seq[$1]", "proc",
-    "pointer", "OpenArray[$1]", "string", "cstring", "Forward",
-    "int", "int8", "int16", "int32", "int64",
-    "float", "float32", "float64", "float128",
-    "uint", "uint8", "uint16", "uint32", "uint64",
-    "owned", "sink",
-    "lent ", "varargs[$1]", "UncheckedArray[$1]", "Error Type",
-    "BuiltInTypeClass", "UserTypeClass",
-    "UserTypeClassInst", "CompositeTypeClass", "inferred",
-    "and", "or", "not", "any", "static", "TypeFromExpr", "concept", # xxx bugfix
-    "void", "iterable"]
-
-proc addTypeFlags(name: var string, typ: PType) {.inline.} =
-  if tfNotNil in typ.flags: name.add(" not nil")
-
-proc isIntLit*(t: PType): bool {.inline.} =
-  result = t.kind == tyInt and t.n != nil and t.n.kind == nkIntLit
-
-proc isFloatLit*(t: PType): bool {.inline.} =
-  result = t.kind == tyFloat and t.n != nil and t.n.kind == nkFloatLit
-
-# TODO: It would be a good idea to kill the special state of a resolved
-# concept by switching to tyAlias within the instantiated procs.
-# Currently, tyAlias is always skipped with skipModifier, which means that
-# we can store information about the matched concept in another position.
-# Then builtInFieldAccess can be modified to properly read the derived
-# consts and types stored within the concept.
-template isResolvedUserTypeClass*(t: PType): bool =
-  tfResolved in t.flags
-
-proc typeToString(typ: PType, prefer: TPreferedDesc = preferName): string =
-  let preferToplevel = prefer
-  proc getPrefer(prefer: TPreferedDesc): TPreferedDesc =
-    if preferToplevel in {preferResolved, preferMixed}:
-      preferToplevel # sticky option
-    else:
-      prefer
-
-  proc typeToString(typ: PType, prefer: TPreferedDesc = preferName): string =
-    result = ""
-    let prefer = getPrefer(prefer)
-    let t = typ
-    if t == nil: return
-    if prefer in preferToResolveSymbols and t.sym != nil and
-         sfAnon notin t.sym.flags and t.kind notin {tySequence, tyInferred}:
-      if t.kind == tyInt and isIntLit(t):
-        if prefer == preferInlayHint:
-          result = t.sym.name.s
-        else:
-          result = t.sym.name.s & " literal(" & $t.n.intVal & ")"
-      elif t.kind == tyAlias and t.elementType.kind != tyAlias:
-        result = typeToString(t.elementType)
-      elif prefer in {preferResolved, preferMixed}:
-        case t.kind
-        of IntegralTypes + {tyFloat..tyFloat128} + {tyString, tyCstring}:
-          result = typeToStr[t.kind]
-        of tyGenericBody:
-          result = typeToString(t.last)
-        of tyCompositeTypeClass:
-          # avoids showing `A[any]` in `proc fun(a: A)` with `A = object[T]`
-          result = typeToString(t.last.last)
-        else:
-          result = t.sym.name.s
-        if prefer == preferMixed and result != t.sym.name.s:
-          result = t.sym.name.s & "{" & result & "}"
-      elif prefer in {preferName, preferTypeName, preferInlayHint, preferInferredEffects} or t.sym.owner.isNil:
-        # note: should probably be: {preferName, preferTypeName, preferGenericArg}
-        result = t.sym.name.s
-        if t.kind == tyGenericParam and t.genericParamHasConstraints:
-          result.add ": "
-          result.add t.elementType.typeToString
-      else:
-        result = t.sym.owner.name.s & '.' & t.sym.name.s
-      result.addTypeFlags(t)
-      return
-    case t.kind
-    of tyInt:
-      if not isIntLit(t) or prefer == preferExported:
-        result = typeToStr[t.kind]
-      else:
-        case prefer:
-        of preferGenericArg:
-          result = $t.n.intVal
-        of preferInlayHint:
-          result = "int"
-        else:
-          result = "int literal(" & $t.n.intVal & ")"
-    of tyGenericInst:
-      result = typeToString(t.genericHead) & '['
-      for needsComma, a in t.genericInstParams:
-        if needsComma: result.add(", ")
-        result.add(typeToString(a, preferGenericArg))
-      result.add(']')
-    of tyGenericInvocation:
-      result = typeToString(t.genericHead) & '['
-      for needsComma, a in t.genericInvocationParams:
-        if needsComma: result.add(", ")
-        result.add(typeToString(a, preferGenericArg))
-      result.add(']')
-    of tyGenericBody:
-      result = typeToString(t.typeBodyImpl) & '['
-      for i, a in t.genericBodyParams:
-        if i > 0: result.add(", ")
-        result.add(typeToString(a, preferTypeName))
-      result.add(']')
-    of tyTypeDesc:
-      if t.elementType.kind == tyNone: result = "typedesc"
-      else: result = "typedesc[" & typeToString(t.elementType) & "]"
-    of tyStatic:
-      if prefer == preferGenericArg and t.n != nil:
-        result = t.n.renderTree
-      else:
-        result = "static[" & (if t.hasElementType: typeToString(t.skipModifier) else: "") & "]"
-        if t.n != nil: result.add "(" & renderTree(t.n) & ")"
-    of tyUserTypeClass:
-      if t.sym != nil and t.sym.owner != nil:
-        if t.isResolvedUserTypeClass: return typeToString(t.last)
-        return t.sym.owner.name.s
-      else:
-        result = "<invalid tyUserTypeClass>"
-    of tyBuiltInTypeClass:
-      result =
-        case t.base.kind
-        of tyVar: "var"
-        of tyRef: "ref"
-        of tyPtr: "ptr"
-        of tySequence: "seq"
-        of tyArray: "array"
-        of tySet: "set"
-        of tyRange: "range"
-        of tyDistinct: "distinct"
-        of tyProc: "proc"
-        of tyObject: "object"
-        of tyTuple: "tuple"
-        of tyOpenArray: "openArray"
-        else: typeToStr[t.base.kind]
-    of tyInferred:
-      let concrete = t.previouslyInferred
-      if concrete != nil: result = typeToString(concrete)
-      else: result = "inferred[" & typeToString(t.base) & "]"
-    of tyUserTypeClassInst:
-      let body = t.base
-      result = body.sym.name.s & "["
-      for needsComma, a in t.userTypeClassInstParams:
-        if needsComma: result.add(", ")
-        result.add(typeToString(a))
-      result.add "]"
-    of tyAnd:
-      for i, son in t.ikids:
-        if i > 0: result.add(" and ")
-        result.add(typeToString(son))
-    of tyOr:
-      for i, son in t.ikids:
-        if i > 0: result.add(" or ")
-        result.add(typeToString(son))
-    of tyNot:
-      result = "not " & typeToString(t.elementType)
-    of tyUntyped:
-      #internalAssert t.len == 0
-      result = "untyped"
-    of tyFromExpr:
-      if t.n == nil:
-        result = "unknown"
-      else:
-        result = "typeof(" & renderTree(t.n) & ")"
-    of tyArray:
-      result = "array"
-      if t.hasElementType:
-        if t.indexType.kind == tyRange:
-          result &= "[" & rangeToStr(t.indexType.n) & ", " &
-              typeToString(t.elementType) & ']'
-        else:
-          result &= "[" & typeToString(t.indexType) & ", " &
-              typeToString(t.elementType) & ']'
-    of tyUncheckedArray:
-      result = "UncheckedArray"
-      if t.hasElementType:
-        result &= "[" & typeToString(t.elementType) & ']'
-    of tySequence:
-      if t.sym != nil and prefer != preferResolved:
-        result = t.sym.name.s
-      else:
-        result = "seq"
-        if t.hasElementType:
-          result &= "[" & typeToString(t.elementType) & ']'
-    of tyOrdinal:
-      result = "ordinal"
-      if t.hasElementType:
-        result &= "[" & typeToString(t.skipModifier) & ']'
-    of tySet:
-      result = "set"
-      if t.hasElementType:
-        result &= "[" & typeToString(t.elementType) & ']'
-    of tyOpenArray:
-      result = "openArray"
-      if t.hasElementType:
-        result &= "[" & typeToString(t.elementType) & ']'
-    of tyDistinct:
-      result = "distinct " & typeToString(t.elementType,
-        if prefer == preferModuleInfo: preferModuleInfo else: preferTypeName)
-    of tyIterable:
-      # xxx factor this pattern
-      result = "iterable"
-      if t.hasElementType:
-        result &= "[" & typeToString(t.skipModifier) & ']'
-    of tyTuple:
-      # we iterate over t.sons here, because t.n may be nil
-      if t.n != nil:
-        result = "tuple["
-        for i in 0..<t.n.len:
-          assert(t.n[i].kind == nkSym)
-          result.add(t.n[i].sym.name.s & ": " & typeToString(t.n[i].sym.typ))
-          if i < t.n.len - 1: result.add(", ")
-        result.add(']')
-      elif t.isEmptyTupleType:
-        result = "tuple[]"
-      elif t.isSingletonTupleType:
-        result = "("
-        for son in t.kids:
-          result.add(typeToString(son))
-        result.add(",)")
-      else:
-        result = "("
-        for i, son in t.ikids:
-          if i > 0: result.add ", "
-          result.add(typeToString(son))
-        result.add(')')
-    of tyPtr, tyRef, tyVar, tyLent:
-      result = if isOutParam(t): "out " else: typeToStr[t.kind]
-      result.add typeToString(t.elementType)
-    of tyRange:
-      result = "range "
-      if t.n != nil and t.n.kind == nkRange:
-        result.add rangeToStr(t.n)
-      if prefer != preferExported:
-        result.add("(" & typeToString(t.elementType) & ")")
-    of tyProc:
-      result = if tfIterator in t.flags: "iterator "
-               elif t.owner != nil:
-                 case t.owner.kind
-                 of skTemplate: "template "
-                 of skMacro: "macro "
-                 of skConverter: "converter "
-                 else: "proc "
-              else:
-                "proc "
-      if tfUnresolved in t.flags: result.add "[*missing parameters*]"
-      result.add "("
-      for i, a in t.paramTypes:
-        if i > FirstParamAt: result.add(", ")
-        let j = paramTypeToNodeIndex(i)
-        if t.n != nil and j < t.n.len and t.n[j].kind == nkSym:
-          result.add(t.n[j].sym.name.s)
-          result.add(": ")
-        result.add(typeToString(a))
-      result.add(')')
-      if t.returnType != nil: result.add(": " & typeToString(t.returnType))
-      var prag = if t.callConv == ccNimCall and tfExplicitCallConv notin t.flags: "" else: $t.callConv
-      var hasImplicitRaises = false
-      if not isNil(t.owner) and not isNil(t.owner.ast) and (t.owner.ast.len - 1) >= pragmasPos:
-        let pragmasNode = t.owner.ast[pragmasPos]
-        let raisesSpec = effectSpec(pragmasNode, wRaises)
-        if not isNil(raisesSpec):
-          addSep(prag)
-          prag.add("raises: ")
-          prag.add(renderTree raisesSpec)
-          hasImplicitRaises = true
-      if tfNoSideEffect in t.flags:
-        addSep(prag)
-        prag.add("noSideEffect")
-      if tfThread in t.flags:
-        addSep(prag)
-        prag.add("gcsafe")
-      var effectsOfStr = ""
-      for i, a in t.paramTypes:
-        let j = paramTypeToNodeIndex(i)
-        if t.n != nil and j < t.n.len and t.n[j].kind == nkSym and t.n[j].sym.kind == skParam and sfEffectsDelayed in t.n[j].sym.flags:
-          addSep(effectsOfStr)
-          effectsOfStr.add(t.n[j].sym.name.s)
-      if effectsOfStr != "":
-        addSep(prag)
-        prag.add("effectsOf: ")
-        prag.add(effectsOfStr)
-      if not hasImplicitRaises and prefer == preferInferredEffects and not isNil(t.owner) and not isNil(t.owner.typ) and not isNil(t.owner.typ.n) and (t.owner.typ.n.len > 0):
-        let effects = t.n[0]
-        if effects.kind == nkEffectList and effects.len == effectListLen:
-          var inferredRaisesStr = ""
-          let effs = effects[exceptionEffects]
-          if not isNil(effs):
-            for eff in items(effs):
-              if not isNil(eff):
-                addSep(inferredRaisesStr)
-                inferredRaisesStr.add($eff.typ)
-          addSep(prag)
-          prag.add("raises: <inferred> [")
-          prag.add(inferredRaisesStr)
-          prag.add("]")
-      if prag.len != 0: result.add("{." & prag & ".}")
-    of tyVarargs:
-      result = typeToStr[t.kind] % typeToString(t.elementType)
-    of tySink:
-      result = "sink " & typeToString(t.skipModifier)
-    of tyOwned:
-      result = "owned " & typeToString(t.elementType)
-    else:
-      result = typeToStr[t.kind]
-    result.addTypeFlags(t)
-  result = typeToString(typ, prefer)
-
-
 proc disamb(g: var TSrcGen; s: PSym): int =
   # we group by 's.name.s' to compute the stable name ID.
   result = 0
@@ -1215,28 +862,10 @@ proc genSymSuffix(result: var string, s: PSym) {.inline.} =
     result.add '_'
     result.addInt s.id
 
-proc gsemmedParams(g: var TSrcGen, n: PNode) =
-  put(g, tkParLe, "(")
-  for i in 1..<n.len:
-    if i > 1:
-      putWithSpace(g, tkComma, ";")
-    let x {.cursor.} = n[i]
-    if x.kind == nkSym:
-      put g, tkSymbol, renderDefinitionName(x.sym)
-      putWithSpace(g, tkColon, ":")
-      put g, tkSymbol, typeToString(x.sym.typ)
-    else:
-      gsub(g, x)
-  put(g, tkParRi, ")")
-  if not isEmptyType(n[0].typ):
-    putWithSpace(g, tkColon, ":")
-    gsub(g, n[0])
-
 proc gproc(g: var TSrcGen, n: PNode) =
   var c: TContext = initContext()
-  var s: PSym = nil
   if n[namePos].kind == nkSym:
-    s = n[namePos].sym
+    let s = n[namePos].sym
     var ret = renderDefinitionName(s)
     ret.genSymSuffix(s)
     put(g, tkSymbol, ret)
@@ -1251,10 +880,7 @@ proc gproc(g: var TSrcGen, n: PNode) =
       gsub(g, n[miscPos][1])
     else:
       gsub(g, n[genericParamsPos])
-  if n[paramsPos].len == 0 and s != nil and s.typ != nil and s.typ.n != nil:
-    gsemmedParams(g, s.typ.n)
-  else:
-    gsub(g, n[paramsPos])
+  gsub(g, n[paramsPos])
   if renderNoPragmas notin g.flags:
     gsub(g, n[pragmasPos])
   if renderNoBody notin g.flags:

compiler/sem.nim

@@ -889,6 +889,8 @@ proc semWithPContext*(c: PContext, n: PNode): PNode =
       else:
         result = newNodeI(nkEmpty, n.info)
       #if c.config.cmd == cmdIdeTools: findSuggest(c, n)
+  storeRodNode(c, result)
+
 
 proc reportUnusedModules(c: PContext) =
   if c.config.cmd == cmdM: return

compiler/semcall.nim

@@ -830,21 +830,6 @@ proc inheritBindings(c: PContext, x: var TCandidate, expectedType: PType) =
   for i in 0 ..< flatUnbound.len():
     x.bindings.put(flatUnbound[i], flatBound[i])
 
-proc compactVoidArgs(n: PNode): PNode =
-  # deletes void args from the argument list, which are created by `setSon`
-  var hasNil = false
-  for i in 0..<n.len:
-    if n[i] == nil:
-      hasNil = true
-      break
-  if not hasNil:
-    result = n
-  else:
-    result = copyNode(n)
-    for i in 0..<n.len:
-      if n[i] != nil:
-        result.add n[i]
-
 proc semResolvedCall(c: PContext, x: var TCandidate,
                      n: PNode, flags: TExprFlags;
                      expectedType: PType = nil): PNode =
@@ -895,7 +880,7 @@ proc semResolvedCall(c: PContext, x: var TCandidate,
   markUsed(c, info, finalCallee, isGenericInstance = true)
   onUse(info, finalCallee, isGenericInstance = true)
 
-  result = compactVoidArgs(x.call)
+  result = x.call
   instGenericConvertersSons(c, result, x)
   markConvertersUsed(c, result)
   result[0] = newSymNode(finalCallee, getCallLineInfo(result[0]))

compiler/semdata.nim

@@ -19,6 +19,8 @@ import
   magicsys, vmdef, modulegraphs, lineinfos, pathutils, layeredtable,
   types, lowerings, trees, parampatterns, astalgo
 
+import ic / ic
+
 type
   TOptionEntry* = object      # entries to put on a stack for pragma parsing
     options*: TOptions
@@ -334,14 +336,28 @@ proc newContext*(graph: ModuleGraph; module: PSym): PContext =
     signatures: initStrTable(),
     features: graph.config.features
   )
+  if graph.config.symbolFiles != disabledSf:
+    let id = module.position
+    if graph.config.cmd != cmdM:
+      assert graph.packed[id].status in {undefined, outdated}
+    graph.packed[id].status = storing
+    graph.packed[id].module = module
+    initEncoder graph, module
+
+template packedRepr*(c): untyped = c.graph.packed[c.module.position].fromDisk
+template encoder*(c): untyped = c.graph.encoders[c.module.position]
 
 proc addIncludeFileDep*(c: PContext; f: FileIndex) =
-  discard
+  if c.config.symbolFiles != disabledSf:
+    addIncludeFileDep(c.encoder, c.packedRepr, f)
 
 proc addImportFileDep*(c: PContext; f: FileIndex) =
-  discard
+  if c.config.symbolFiles != disabledSf:
+    addImportFileDep(c.encoder, c.packedRepr, f)
 
 proc addPragmaComputation*(c: PContext; n: PNode) =
+  if c.config.symbolFiles != disabledSf:
+    addPragmaComputation(c.encoder, c.packedRepr, n)
   # Also store for NIF-based IC (cmdM mode or optCompress)
   if optCompress in c.config.globalOptions or c.config.cmd == cmdM:
     addNifReplayAction(c.graph, c.module.position.int32, n)
@@ -352,28 +368,38 @@ proc inclSym(sq: var seq[PSym], s: PSym): bool =
   sq.add s
   result = true
 
-proc addConverter*(c: PContext, conv: PSym) =
-  assert conv != nil
-  if inclSym(c.converters, conv):
+proc addConverter*(c: PContext, conv: LazySym) =
+  assert conv.sym != nil
+  if inclSym(c.converters, conv.sym):
     add(c.graph.ifaces[c.module.position].converters, conv)
 
-proc addConverterDef*(c: PContext, conv: PSym) =
+proc addConverterDef*(c: PContext, conv: LazySym) =
   addConverter(c, conv)
+  if c.config.symbolFiles != disabledSf:
+    addConverter(c.encoder, c.packedRepr, conv.sym)
 
-proc addPureEnum*(c: PContext, e: PSym) =
-  assert e != nil
+proc addPureEnum*(c: PContext, e: LazySym) =
+  assert e.sym != nil
   add(c.graph.ifaces[c.module.position].pureEnums, e)
+  if c.config.symbolFiles != disabledSf:
+    addPureEnum(c.encoder, c.packedRepr, e.sym)
 
-proc addPattern*(c: PContext, p: PSym) =
-  assert p != nil
-  if inclSym(c.patterns, p):
+proc addPattern*(c: PContext, p: LazySym) =
+  assert p.sym != nil
+  if inclSym(c.patterns, p.sym):
     add(c.graph.ifaces[c.module.position].patterns, p)
+  if c.config.symbolFiles != disabledSf:
+    addTrmacro(c.encoder, c.packedRepr, p.sym)
 
 proc exportSym*(c: PContext; s: PSym) =
   strTableAdds(c.graph, c.module, s)
+  if c.config.symbolFiles != disabledSf:
+    addExported(c.encoder, c.packedRepr, s)
 
 proc reexportSym*(c: PContext; s: PSym) =
   strTableAdds(c.graph, c.module, s)
+  if c.config.symbolFiles != disabledSf:
+    addReexport(c.encoder, c.packedRepr, s)
 
 proc newLib*(kind: TLibKind): PLib =
   result = PLib(kind: kind)   #result.syms = initObjectSet()
@@ -588,11 +614,19 @@ template addExport*(c: PContext; s: PSym) =
   ## convenience to export a symbol from the current module
   addExport(c.graph, c.module, s)
 
+proc storeRodNode*(c: PContext, n: PNode) =
+  if c.config.symbolFiles != disabledSf:
+    toPackedNodeTopLevel(n, c.encoder, c.packedRepr)
+
 proc addToGenericProcCache*(c: PContext; s: PSym; inst: PInstantiation) =
-  c.graph.procInstCache.mgetOrPut(s.itemId, @[]).add inst
+  c.graph.procInstCache.mgetOrPut(s.itemId, @[]).add LazyInstantiation(module: c.module.position, inst: inst)
+  if c.config.symbolFiles != disabledSf:
+    storeInstantiation(c.encoder, c.packedRepr, s, inst)
 
 proc addToGenericCache*(c: PContext; s: PSym; inst: PType) =
-  c.graph.typeInstCache.mgetOrPut(s.itemId, @[]).add inst
+  c.graph.typeInstCache.mgetOrPut(s.itemId, @[]).add LazyType(typ: inst)
+  if c.config.symbolFiles != disabledSf:
+    storeTypeInst(c.encoder, c.packedRepr, s, inst)
 
 proc sealRodFile*(c: PContext) =
   if c.config.symbolFiles != disabledSf:
@@ -608,8 +642,9 @@ proc rememberExpansion*(c: PContext; info: TLineInfo; expandedSym: PSym) =
   ## in the sem'checked AST. This is very bad for IDE-like tooling
   ## ("find all usages of this template" would not work). We need special
   ## logic to remember macro/template expansions. This is done here and
-  ## delegated to the "NIF" file mechanism.
-  discard "XXX To implement"
+  ## delegated to the "rod" file mechanism.
+  if c.config.symbolFiles != disabledSf:
+    storeExpansion(c.encoder, c.packedRepr, info, expandedSym)
 
 const
   errVarForOutParamNeededX = "for a 'var' type a variable needs to be passed; but '$1' is immutable"

compiler/semexprs.nim

@@ -832,6 +832,9 @@ proc semArrayConstr(c: PContext, n: PNode, flags: TExprFlags; expectedType: PTyp
 proc fixAbstractType(c: PContext, n: PNode) =
   for i in 1..<n.len:
     let it = n[i]
+    if it == nil:
+      localError(c.config, n.info, "'$1' has nil child at index $2" % [renderTree(n, {renderNoComments}), $i])
+      return
     # do not get rid of nkHiddenSubConv for OpenArrays, the codegen needs it:
     if it.kind == nkHiddenSubConv and
         skipTypes(it.typ, abstractVar).kind notin {tyOpenArray, tyVarargs}:
@@ -1152,7 +1155,7 @@ proc semIndirectOp(c: PContext, n: PNode, flags: TExprFlags; expectedType: PType
           localError(c.config, n.info, msg)
         return errorNode(c, n)
     else:
-      result = compactVoidArgs(m.call)
+      result = m.call
       instGenericConvertersSons(c, result, m)
       markConvertersUsed(c, result)
 
@@ -1658,9 +1661,6 @@ proc semDeref(c: PContext, n: PNode, flags: TExprFlags): PNode =
     n[0] = a
   result = n
   var t = skipTypes(n[0].typ, {tyGenericInst, tyVar, tyLent, tyAlias, tySink, tyOwned})
-  if t.kind == tyTypeDesc:
-    localError(c.config, n.info, "missing generic parameter")
-    return nil
   case t.kind
   of tyRef, tyPtr: n.typ = t.elementType
   of tyMetaTypes, tyFromExpr:
@@ -3013,9 +3013,9 @@ proc semExportExcept(c: PContext, n: PNode): PNode =
 
 proc semExport(c: PContext, n: PNode): PNode =
   proc specialSyms(c: PContext; s: PSym) {.inline.} =
-    if s.kind == skConverter: addConverter(c, s)
+    if s.kind == skConverter: addConverter(c, LazySym(sym: s))
     elif s.kind == skType and s.typ != nil and s.typ.kind == tyEnum and sfPure in s.flags:
-      addPureEnum(c, s)
+      addPureEnum(c, LazySym(sym: s))
 
   result = newNodeI(nkExportStmt, n.info)
   for i in 0..<n.len:

compiler/sempass2.nim

@@ -84,8 +84,6 @@ type
     gcUnsafe, isRecursive, isTopLevel, hasSideEffect, inEnforcedGcSafe: bool
     isInnerProc: bool
     inEnforcedNoSideEffects: bool
-    isArrayIndexing: bool
-    currentExceptType: PType
     unknownRaises: seq[(PSym, TLineInfo)]
     currOptions: TOptions
     optionsStack: seq[(TOptions, TNoteKinds)]
@@ -149,37 +147,6 @@ proc isLocalSym(a: PEffects, s: PSym): bool =
   s.typ != nil and (s.kind in {skLet, skVar, skResult} or (s.kind == skParam and isOutParam(s.typ))) and
     sfGlobal notin s.flags and s.owner == a.owner
 
-proc isRangeSupertype(conf: ConfigRef; wider, narrower: PType): bool =
-  ## Check if `wider` type fully contains `narrower` type
-  ## Returns true if narrower fits entirely within wider (safe conversion)
-  if wider.isOrdinalType:
-    let wideFirst = firstOrd(conf, wider)
-    let wideLast = lastOrd(conf, wider)
-    let narrowFirst = firstOrd(conf, narrower)
-    let narrowLast = lastOrd(conf, narrower)
-    result = narrowFirst >= wideFirst and narrowLast <= wideLast
-  elif not narrower.isOrdinalType:
-    let wideFirst = firstFloat(wider)
-    let wideLast = lastFloat(wider)
-    let narrowFirst = firstFloat(narrower)
-    let narrowLast = lastFloat(narrower)
-    result = narrowFirst >= wideFirst and narrowLast <= wideLast
-  else:
-    # int -> float ranges; warn
-    result = false
-
-proc shouldWarnRangeConversion(conf: ConfigRef; formalType, argType: PType): bool =
-  ## Determine if an implicit range conversion should warn
-  ## We warn on conversions that are likely to cause panics
-  let f = formalType.skipTypes({tyGenericInst, tyAlias, tySink, tyDistinct})
-  let a = argType.skipTypes({tyGenericInst, tyAlias, tySink, tyDistinct})
-  if f.kind == tyRange:
-    # Only warn if formal range doesn't fully contain argument range
-    # Check if the ranges don't perfectly overlap
-    result = not isRangeSupertype(conf, f, a)
-  else:
-    result = false
-
 proc lockLocations(a: PEffects; pragma: PNode) =
   if pragma.kind != nkExprColonExpr:
     localError(a.config, pragma.info, "locks pragma without argument")
@@ -610,25 +577,11 @@ proc trackTryStmt(tracked: PEffects, n: PNode) =
     let b = n[i]
     if b.kind == nkExceptBranch:
       setLen(tracked.init, oldState)
-      # If this except branch catches exactly one type, record it so an
-      # empty `raise` inside the branch can be inferred as re-raising that
-      # specific exception type instead of the generic `Exception`.
-      var savedExcept: PType = tracked.currentExceptType
-      var inferredExcept: PType = nil
-      if b.len == 2:
-        if b[0].isInfixAs():
-          assert(b[0][1].kind == nkType)
-          inferredExcept = b[0][1].typ
-        else:
-          assert(b[0].kind == nkType)
-          inferredExcept = b[0].typ
-      tracked.currentExceptType = inferredExcept
       for j in 0..<b.len - 1:
         if b[j].isInfixAs(): # skips initialization checks
           assert(b[j][2].kind == nkSym)
           tracked.init.add b[j][2].sym.id
       track(tracked, b[^1])
-      tracked.currentExceptType = savedExcept
       for i in oldState..<tracked.init.len:
         addToIntersection(inter, tracked.init[i], bsNone)
     else:
@@ -1311,14 +1264,7 @@ proc track(tracked: PEffects, n: PNode) =
       # A `raise` with no arguments means we're going to re-raise the exception
       # being handled or, if outside of an `except` block, a `ReraiseDefect`.
       # Here we add a `Exception` tag in order to cover both the cases.
-      if tracked.currentExceptType != nil:
-        var en = newNode(nkType)
-        en.typ = tracked.currentExceptType
-        en.info = n.info
-        addRaiseEffect(tracked, en, nil)
-        createTypeBoundOps(tracked, tracked.currentExceptType, n.info)
-      else:
-        addRaiseEffect(tracked, createRaise(tracked.graph, n), nil)
+      addRaiseEffect(tracked, createRaise(tracked.graph, n), nil)
   of nkCallKinds:
     trackCall(tracked, n)
   of nkDotExpr:
@@ -1536,11 +1482,6 @@ proc track(tracked: PEffects, n: PNode) =
       message(tracked.config, n.info, warnPtrToCstringConv,
           $n[1].typ)
 
-    # Check for implicit range conversions
-    if n.kind == nkHiddenStdConv and (not tracked.isArrayIndexing) and
-          shouldWarnRangeConversion(tracked.config, n.typ, n[1].typ):
-      message(tracked.config, n.info, warnImplicitRangeConversion,
-              typeToString(n[1].typ) & " -> " & typeToString(n.typ))
 
     let t = n.typ.skipTypes(abstractInst)
     if t.kind == tyEnum:
@@ -1579,12 +1520,7 @@ proc track(tracked: PEffects, n: PNode) =
         checkBounds(tracked, n[0], n[1])
     track(tracked, n[0])
     dec tracked.leftPartOfAsgn
-    for i in 1 ..< n.len:
-      if i == 1:
-        tracked.isArrayIndexing = true
-      track(tracked, n[i])
-      if i == 1:
-        tracked.isArrayIndexing = false
+    for i in 1 ..< n.len: track(tracked, n[i])
     inc tracked.leftPartOfAsgn
   of nkError:
     localError(tracked.config, n.info, errorToString(tracked.config, n))

compiler/semstmts.nim

@@ -1845,13 +1845,6 @@ proc typeSectionFinalPass(c: PContext, n: PNode) =
           let baseType = s.typ.safeSkipTypes(abstractPtrs)
           if baseType.kind in {tyObject, tyTuple} and not baseType.n.isNil:
             checkForMetaFields(c, baseType.n, hasError)
-
-        if s.typ.kind in {tySet, tyArray, tySequence, tyUncheckedArray} and s.typ.elementType.kind == tyNone:
-          # magic generics are not filled but tyNone is added to its elements by default,
-          # we lift them to tyBuiltInTypeClass here
-          s.typ = newTypeS(tyBuiltInTypeClass, c,
-                    newTypeS(s.typ.kind, c))
-
         if not hasError:
           checkConstructedType(c.config, s.info, s.typ)
   #instAllTypeBoundOp(c, n.info)
@@ -2783,7 +2776,7 @@ proc semConverterDef(c: PContext, n: PNode): PNode =
   var t = s.typ
   if t.returnType == nil: localError(c.config, n.info, errXNeedsReturnType % "converter")
   if t.len != 2: localError(c.config, n.info, "a converter takes exactly one argument")
-  addConverterDef(c, s)
+  addConverterDef(c, LazySym(sym: s))
 
 proc semMacroDef(c: PContext, n: PNode): PNode =
   result = semProcAux(c, n, skMacro, macroPragmas)

compiler/semtempl.nim

@@ -925,4 +925,4 @@ proc semPattern(c: PContext, n: PNode; s: PSym): PNode =
     elif result.len == 0:
       localError(c.config, n.info, "a pattern cannot be empty")
   closeScope(c)
-  addPattern(c, s)
+  addPattern(c, LazySym(sym: s))

compiler/semtypes.nim

@@ -210,7 +210,7 @@ proc semEnum(c: PContext, n: PNode, prev: PType): PType =
     )
 
   if isPure and sfExported in result.sym.flags:
-    addPureEnum(c, result.sym)
+    addPureEnum(c, LazySym(sym: result.sym))
   if tfNotNil in e.typ.flags and not hasNull:
     result.incl tfRequiresInit
   setToStringProc(c.graph, result, genEnumToStrProc(result, n.info, c.graph, c.idgen))
@@ -2219,8 +2219,7 @@ proc semTypeNode(c: PContext, n: PNode, prev: PType): PType =
     else:
       result = semTypeNode(c, whenResult, prev)
   of nkBracketExpr:
-    # Actually len >= 2 is required, but it doesn't print errors nicely with empty brackets
-    checkMinSonsLen(n, 1, c.config)
+    checkMinSonsLen(n, 2, c.config)
     var head = n[0]
     var s = if head.kind notin nkCallKinds: semTypeIdent(c, head)
             else: symFromExpectedTypeNode(c, semExpr(c, head))
@@ -2238,21 +2237,10 @@ proc semTypeNode(c: PContext, n: PNode, prev: PType): PType =
         incl result, tfHasAsgn
     of mVarargs: result = semVarargs(c, n, prev)
     of mTypeDesc, mType, mTypeOf:
-      if n.len != 2:
-        let name = case s.magic:
-                   of mTypeDesc: "typedesc"
-                   of mType: "type"
-                   of mTypeOf: "typeof"
-                   else: ""
-        localError(c.config, n.info, errXExpectsOneTypeParam % name)
-      else:
-        result = makeTypeDesc(c, semTypeNode(c, n[1], nil))
-        result.incl tfExplicit
+      result = makeTypeDesc(c, semTypeNode(c, n[1], nil))
+      result.incl tfExplicit
     of mStatic:
-      if n.len != 2:
-        localError(c.config, n.info, errXExpectsOneTypeParam % "static")
-      else:
-        result = semStaticType(c, n[1], prev)
+      result = semStaticType(c, n[1], prev)
     of mExpr:
       result = semTypeNode(c, n[0], nil)
       if result != nil:
@@ -2262,11 +2250,9 @@ proc semTypeNode(c: PContext, n: PNode, prev: PType): PType =
         for i in 1..<n.len:
           result.rawAddSon(semTypeNode(c, n[i], nil))
     of mDistinct:
-      checkSonsLen(n, 2, c.config)
       result = newOrPrevType(tyDistinct, prev, c)
       addSonSkipIntLit(result, semTypeNode(c, n[1], nil), c.idgen)
     of mVar:
-      checkSonsLen(n, 2, c.config)
       result = newOrPrevType(tyVar, prev, c)
       var base = semTypeNode(c, n[1], nil)
       if base.kind in {tyVar, tyLent}:

compiler/semtypinst.nim

@@ -373,7 +373,6 @@ proc replaceTypeVarsS(cl: var TReplTypeVars, s: PSym, t: PType): PSym =
       var g: G[string]
 
   ]#
-  # XXX FIXME This causes system.Natural to be duplicated during compilation of system.nim as cl.owner == nil!
   result = copySym(s, cl.c.idgen)
   incl(result.flagsImpl, sfFromGeneric)
   #idTablePut(cl.symMap, s, result)

compiler/sighashes.nim

@@ -154,7 +154,7 @@ proc hashType(c: var MD5Context, t: PType; flags: set[ConsiderFlag]; conf: Confi
       assert inst.kind == tyGenericInst
       c.hashType inst.genericHead, flags, conf
       for _, a in inst.genericInstParams:
-        c.hashType a, flags+{CoDistinct}, conf
+        c.hashType a, flags, conf
       t.typeInstImpl = inst
       return
     c &= char(t.kind)

compiler/sigmatch.nim

@@ -615,8 +615,6 @@ proc isGenericObjectOf(f, a: PType): bool =
   # use sym equality to check if the `tyGenericBody` types are equal
   result = aRoot != nil and f.sym == aRoot.sym
 
-
-
 proc isObjectSubtype(c: var TCandidate; a, f, fGenericOrigin: PType): int =
   var t = a
   assert t.kind == tyObject
@@ -3094,7 +3092,6 @@ proc matches*(c: PContext, n, nOrig: PNode, m: var TCandidate) =
             put(m, formal.typ, defaultValue.typ)
         defaultValue.flags.incl nfDefaultParam
         setSon(m.call, formal.position + 1, defaultValue)
-
   # forget all inferred types if the overload matching failed
   if m.state == csNoMatch:
     for t in m.inferredTypes:

compiler/types.nim

@@ -18,9 +18,21 @@ import std/[intsets, strutils]
 when defined(nimPreviewSlimSystem):
   import std/[assertions, formatfloat]
 
-export isResolvedUserTypeClass, TPreferedDesc, typeToString
-
 type
+  TPreferedDesc* = enum
+    preferName, # default
+    preferDesc, # probably should become what preferResolved is
+    preferExported,
+    preferModuleInfo, # fully qualified
+    preferGenericArg,
+    preferTypeName,
+    preferResolved, # fully resolved symbols
+    preferMixed,
+      # most useful, shows: symbol + resolved symbols if it differs, e.g.:
+      # tuple[a: MyInt{int}, b: float]
+    preferInlayHint,
+    preferInferredEffects,
+
   TTypeRelation* = enum      # order is important!
     isNone, isConvertible,
     isIntConv,
@@ -43,6 +55,8 @@ type
     pcmNotIterator
     pcmDifferentCallConv
 
+proc typeToString*(typ: PType; prefer: TPreferedDesc = preferName): string
+
 proc addTypeDeclVerboseMaybe*(result: var string, conf: ConfigRef; typ: PType) =
   if optDeclaredLocs in conf.globalOptions:
     result.add typeToString(typ, preferMixed)
@@ -50,6 +64,8 @@ proc addTypeDeclVerboseMaybe*(result: var string, conf: ConfigRef; typ: PType) =
   else:
     result.add typeToString(typ)
 
+template `$`*(typ: PType): string = typeToString(typ)
+
 # ------------------- type iterator: ----------------------------------------
 type
   TTypeIter* = proc (t: PType, closure: RootRef): bool {.nimcall.} # true if iteration should stop
@@ -141,9 +157,15 @@ proc getFloatValue*(n: PNode): BiggestFloat =
   of nkHiddenStdConv: getFloatValue(n[1])
   else: NaN
 
+proc isIntLit*(t: PType): bool {.inline.} =
+  result = t.kind == tyInt and t.n != nil and t.n.kind == nkIntLit
+
+proc isFloatLit*(t: PType): bool {.inline.} =
+  result = t.kind == tyFloat and t.n != nil and t.n.kind == nkFloatLit
+
 proc addTypeHeader*(result: var string, conf: ConfigRef; typ: PType; prefer: TPreferedDesc = preferMixed; getDeclarationPath = true) =
   result.add typeToString(typ, prefer)
-  if getDeclarationPath and typ.sym != nil: result.addDeclaredLoc(conf, typ.sym)
+  if getDeclarationPath: result.addDeclaredLoc(conf, typ.sym)
 
 proc getProcHeader*(conf: ConfigRef; sym: PSym; prefer: TPreferedDesc = preferName; getDeclarationPath = true): string =
   assert sym != nil
@@ -438,10 +460,337 @@ proc canFormAcycle*(g: ModuleGraph, typ: PType): bool =
   let t = skipTypes(typ, abstractInst+{tyOwned}-{tyTypeDesc})
   result = canFormAcycleAux(g, marker, t, t, false, false)
 
+proc valueToString(a: PNode): string =
+  case a.kind
+  of nkCharLit, nkUIntLit..nkUInt64Lit:
+    result = $cast[uint64](a.intVal)
+  of nkIntLit..nkInt64Lit:
+    result = $a.intVal
+  of nkFloatLit..nkFloat128Lit: result = $a.floatVal
+  of nkStrLit..nkTripleStrLit: result = a.strVal
+  of nkStaticExpr: result = "static(" & a[0].renderTree & ")"
+  else: result = "<invalid value>"
+
+proc rangeToStr(n: PNode): string =
+  assert(n.kind == nkRange)
+  result = valueToString(n[0]) & ".." & valueToString(n[1])
+
+const
+  typeToStr: array[TTypeKind, string] = ["None", "bool", "char", "empty",
+    "Alias", "typeof(nil)", "untyped", "typed", "typeDesc",
+    # xxx typeDesc=>typedesc: typedesc is declared as such, and is 10x more common.
+    "GenericInvocation", "GenericBody", "GenericInst", "GenericParam",
+    "distinct $1", "enum", "ordinal[$1]", "array[$1, $2]", "object", "tuple",
+    "set[$1]", "range[$1]", "ptr ", "ref ", "var ", "seq[$1]", "proc",
+    "pointer", "OpenArray[$1]", "string", "cstring", "Forward",
+    "int", "int8", "int16", "int32", "int64",
+    "float", "float32", "float64", "float128",
+    "uint", "uint8", "uint16", "uint32", "uint64",
+    "owned", "sink",
+    "lent ", "varargs[$1]", "UncheckedArray[$1]", "Error Type",
+    "BuiltInTypeClass", "UserTypeClass",
+    "UserTypeClassInst", "CompositeTypeClass", "inferred",
+    "and", "or", "not", "any", "static", "TypeFromExpr", "concept", # xxx bugfix
+    "void", "iterable"]
+
+const preferToResolveSymbols = {preferName, preferTypeName, preferModuleInfo,
+  preferGenericArg, preferResolved, preferMixed, preferInlayHint, preferInferredEffects}
+
 template bindConcreteTypeToUserTypeClass*(tc, concrete: PType) =
   tc.add concrete
   tc.incl tfResolved
 
+# TODO: It would be a good idea to kill the special state of a resolved
+# concept by switching to tyAlias within the instantiated procs.
+# Currently, tyAlias is always skipped with skipModifier, which means that
+# we can store information about the matched concept in another position.
+# Then builtInFieldAccess can be modified to properly read the derived
+# consts and types stored within the concept.
+template isResolvedUserTypeClass*(t: PType): bool =
+  tfResolved in t.flags
+
+proc addTypeFlags(name: var string, typ: PType) {.inline.} =
+  if tfNotNil in typ.flags: name.add(" not nil")
+
+proc typeToString(typ: PType, prefer: TPreferedDesc = preferName): string =
+  let preferToplevel = prefer
+  proc getPrefer(prefer: TPreferedDesc): TPreferedDesc =
+    if preferToplevel in {preferResolved, preferMixed}:
+      preferToplevel # sticky option
+    else:
+      prefer
+
+  proc typeToString(typ: PType, prefer: TPreferedDesc = preferName): string =
+    result = ""
+    let prefer = getPrefer(prefer)
+    let t = typ
+    if t == nil: return
+    if prefer in preferToResolveSymbols and t.sym != nil and
+         sfAnon notin t.sym.flags and t.kind notin {tySequence, tyInferred}:
+      if t.kind == tyInt and isIntLit(t):
+        if prefer == preferInlayHint:
+          result = t.sym.name.s
+        else:
+          result = t.sym.name.s & " literal(" & $t.n.intVal & ")"
+      elif t.kind == tyAlias and t.elementType.kind != tyAlias:
+        result = typeToString(t.elementType)
+      elif prefer in {preferResolved, preferMixed}:
+        case t.kind
+        of IntegralTypes + {tyFloat..tyFloat128} + {tyString, tyCstring}:
+          result = typeToStr[t.kind]
+        of tyGenericBody:
+          result = typeToString(t.last)
+        of tyCompositeTypeClass:
+          # avoids showing `A[any]` in `proc fun(a: A)` with `A = object[T]`
+          result = typeToString(t.last.last)
+        else:
+          result = t.sym.name.s
+        if prefer == preferMixed and result != t.sym.name.s:
+          result = t.sym.name.s & "{" & result & "}"
+      elif prefer in {preferName, preferTypeName, preferInlayHint, preferInferredEffects} or t.sym.owner.isNil:
+        # note: should probably be: {preferName, preferTypeName, preferGenericArg}
+        result = t.sym.name.s
+        if t.kind == tyGenericParam and t.genericParamHasConstraints:
+          result.add ": "
+          result.add t.elementType.typeToString
+      else:
+        result = t.sym.owner.name.s & '.' & t.sym.name.s
+      result.addTypeFlags(t)
+      return
+    case t.kind
+    of tyInt:
+      if not isIntLit(t) or prefer == preferExported:
+        result = typeToStr[t.kind]
+      else:
+        case prefer:
+        of preferGenericArg:
+          result = $t.n.intVal
+        of preferInlayHint:
+          result = "int"
+        else:
+          result = "int literal(" & $t.n.intVal & ")"
+    of tyGenericInst:
+      result = typeToString(t.genericHead) & '['
+      for needsComma, a in t.genericInstParams:
+        if needsComma: result.add(", ")
+        result.add(typeToString(a, preferGenericArg))
+      result.add(']')
+    of tyGenericInvocation:
+      result = typeToString(t.genericHead) & '['
+      for needsComma, a in t.genericInvocationParams:
+        if needsComma: result.add(", ")
+        result.add(typeToString(a, preferGenericArg))
+      result.add(']')
+    of tyGenericBody:
+      result = typeToString(t.typeBodyImpl) & '['
+      for i, a in t.genericBodyParams:
+        if i > 0: result.add(", ")
+        result.add(typeToString(a, preferTypeName))
+      result.add(']')
+    of tyTypeDesc:
+      if t.elementType.kind == tyNone: result = "typedesc"
+      else: result = "typedesc[" & typeToString(t.elementType) & "]"
+    of tyStatic:
+      if prefer == preferGenericArg and t.n != nil:
+        result = t.n.renderTree
+      else:
+        result = "static[" & (if t.hasElementType: typeToString(t.skipModifier) else: "") & "]"
+        if t.n != nil: result.add "(" & renderTree(t.n) & ")"
+    of tyUserTypeClass:
+      if t.sym != nil and t.sym.owner != nil:
+        if t.isResolvedUserTypeClass: return typeToString(t.last)
+        return t.sym.owner.name.s
+      else:
+        result = "<invalid tyUserTypeClass>"
+    of tyBuiltInTypeClass:
+      result =
+        case t.base.kind
+        of tyVar: "var"
+        of tyRef: "ref"
+        of tyPtr: "ptr"
+        of tySequence: "seq"
+        of tyArray: "array"
+        of tySet: "set"
+        of tyRange: "range"
+        of tyDistinct: "distinct"
+        of tyProc: "proc"
+        of tyObject: "object"
+        of tyTuple: "tuple"
+        of tyOpenArray: "openArray"
+        else: typeToStr[t.base.kind]
+    of tyInferred:
+      let concrete = t.previouslyInferred
+      if concrete != nil: result = typeToString(concrete)
+      else: result = "inferred[" & typeToString(t.base) & "]"
+    of tyUserTypeClassInst:
+      let body = t.base
+      result = body.sym.name.s & "["
+      for needsComma, a in t.userTypeClassInstParams:
+        if needsComma: result.add(", ")
+        result.add(typeToString(a))
+      result.add "]"
+    of tyAnd:
+      for i, son in t.ikids:
+        if i > 0: result.add(" and ")
+        result.add(typeToString(son))
+    of tyOr:
+      for i, son in t.ikids:
+        if i > 0: result.add(" or ")
+        result.add(typeToString(son))
+    of tyNot:
+      result = "not " & typeToString(t.elementType)
+    of tyUntyped:
+      #internalAssert t.len == 0
+      result = "untyped"
+    of tyFromExpr:
+      if t.n == nil:
+        result = "unknown"
+      else:
+        result = "typeof(" & renderTree(t.n) & ")"
+    of tyArray:
+      result = "array"
+      if t.hasElementType:
+        if t.indexType.kind == tyRange:
+          result &= "[" & rangeToStr(t.indexType.n) & ", " &
+              typeToString(t.elementType) & ']'
+        else:
+          result &= "[" & typeToString(t.indexType) & ", " &
+              typeToString(t.elementType) & ']'
+    of tyUncheckedArray:
+      result = "UncheckedArray"
+      if t.hasElementType:
+        result &= "[" & typeToString(t.elementType) & ']'
+    of tySequence:
+      if t.sym != nil and prefer != preferResolved:
+        result = t.sym.name.s
+      else:
+        result = "seq"
+        if t.hasElementType:
+          result &= "[" & typeToString(t.elementType) & ']'
+    of tyOrdinal:
+      result = "ordinal"
+      if t.hasElementType:
+        result &= "[" & typeToString(t.skipModifier) & ']'
+    of tySet:
+      result = "set"
+      if t.hasElementType:
+        result &= "[" & typeToString(t.elementType) & ']'
+    of tyOpenArray:
+      result = "openArray"
+      if t.hasElementType:
+        result &= "[" & typeToString(t.elementType) & ']'
+    of tyDistinct:
+      result = "distinct " & typeToString(t.elementType,
+        if prefer == preferModuleInfo: preferModuleInfo else: preferTypeName)
+    of tyIterable:
+      # xxx factor this pattern
+      result = "iterable"
+      if t.hasElementType:
+        result &= "[" & typeToString(t.skipModifier) & ']'
+    of tyTuple:
+      # we iterate over t.sons here, because t.n may be nil
+      if t.n != nil:
+        result = "tuple["
+        for i in 0..<t.n.len:
+          assert(t.n[i].kind == nkSym)
+          result.add(t.n[i].sym.name.s & ": " & typeToString(t.n[i].sym.typ))
+          if i < t.n.len - 1: result.add(", ")
+        result.add(']')
+      elif t.isEmptyTupleType:
+        result = "tuple[]"
+      elif t.isSingletonTupleType:
+        result = "("
+        for son in t.kids:
+          result.add(typeToString(son))
+        result.add(",)")
+      else:
+        result = "("
+        for i, son in t.ikids:
+          if i > 0: result.add ", "
+          result.add(typeToString(son))
+        result.add(')')
+    of tyPtr, tyRef, tyVar, tyLent:
+      result = if isOutParam(t): "out " else: typeToStr[t.kind]
+      result.add typeToString(t.elementType)
+    of tyRange:
+      result = "range "
+      if t.n != nil and t.n.kind == nkRange:
+        result.add rangeToStr(t.n)
+      if prefer != preferExported:
+        result.add("(" & typeToString(t.elementType) & ")")
+    of tyProc:
+      result = if tfIterator in t.flags: "iterator "
+               elif t.owner != nil:
+                 case t.owner.kind
+                 of skTemplate: "template "
+                 of skMacro: "macro "
+                 of skConverter: "converter "
+                 else: "proc "
+              else:
+                "proc "
+      if tfUnresolved in t.flags: result.add "[*missing parameters*]"
+      result.add "("
+      for i, a in t.paramTypes:
+        if i > FirstParamAt: result.add(", ")
+        let j = paramTypeToNodeIndex(i)
+        if t.n != nil and j < t.n.len and t.n[j].kind == nkSym:
+          result.add(t.n[j].sym.name.s)
+          result.add(": ")
+        result.add(typeToString(a))
+      result.add(')')
+      if t.returnType != nil: result.add(": " & typeToString(t.returnType))
+      var prag = if t.callConv == ccNimCall and tfExplicitCallConv notin t.flags: "" else: $t.callConv
+      var hasImplicitRaises = false
+      if not isNil(t.owner) and not isNil(t.owner.ast) and (t.owner.ast.len - 1) >= pragmasPos:
+        let pragmasNode = t.owner.ast[pragmasPos]
+        let raisesSpec = effectSpec(pragmasNode, wRaises)
+        if not isNil(raisesSpec):
+          addSep(prag)
+          prag.add("raises: ")
+          prag.add($raisesSpec)
+          hasImplicitRaises = true
+      if tfNoSideEffect in t.flags:
+        addSep(prag)
+        prag.add("noSideEffect")
+      if tfThread in t.flags:
+        addSep(prag)
+        prag.add("gcsafe")
+      var effectsOfStr = ""
+      for i, a in t.paramTypes:
+        let j = paramTypeToNodeIndex(i)
+        if t.n != nil and j < t.n.len and t.n[j].kind == nkSym and t.n[j].sym.kind == skParam and sfEffectsDelayed in t.n[j].sym.flags:
+          addSep(effectsOfStr)
+          effectsOfStr.add(t.n[j].sym.name.s)
+      if effectsOfStr != "":
+        addSep(prag)
+        prag.add("effectsOf: ")
+        prag.add(effectsOfStr)
+      if not hasImplicitRaises and prefer == preferInferredEffects and not isNil(t.owner) and not isNil(t.owner.typ) and not isNil(t.owner.typ.n) and (t.owner.typ.n.len > 0):
+        let effects = t.n[0]
+        if effects.kind == nkEffectList and effects.len == effectListLen:
+          var inferredRaisesStr = ""
+          let effs = effects[exceptionEffects]
+          if not isNil(effs):
+            for eff in items(effs):
+              if not isNil(eff):
+                addSep(inferredRaisesStr)
+                inferredRaisesStr.add($eff.typ)
+          addSep(prag)
+          prag.add("raises: <inferred> [")
+          prag.add(inferredRaisesStr)
+          prag.add("]")
+      if prag.len != 0: result.add("{." & prag & ".}")
+    of tyVarargs:
+      result = typeToStr[t.kind] % typeToString(t.elementType)
+    of tySink:
+      result = "sink " & typeToString(t.skipModifier)
+    of tyOwned:
+      result = "owned " & typeToString(t.elementType)
+    else:
+      result = typeToStr[t.kind]
+    result.addTypeFlags(t)
+  result = typeToString(typ, prefer)
+
 proc firstOrd*(conf: ConfigRef; t: PType): Int128 =
   case t.kind
   of tyBool, tyChar, tySequence, tyOpenArray, tyString, tyVarargs, tyError:

compiler/vm.nim

@@ -663,10 +663,7 @@ proc rawExecute(c: PCtx, start: int, tos: PStackFrame): TFullReg =
       of rkNode:
         if regs[rb].node.typ.kind notin PtrLikeKinds:
           stackTrace(c, tos, pc, "opcCastIntToPtr: regs[rb].node.typ: " & $regs[rb].node.typ.kind)
-        if regs[rb].node.kind == nkNilLit:
-          node2.intVal = 0
-        else:
-          node2.intVal = regs[rb].node.intVal
+        node2.intVal = regs[rb].node.intVal
       else: stackTrace(c, tos, pc, "opcCastIntToPtr: regs[rb].kind: " & $regs[rb].kind)
       regs[ra].node = node2
     of opcAsgnComplex:
@@ -1840,20 +1837,6 @@ proc rawExecute(c: PCtx, start: int, tos: PStackFrame): TFullReg =
       case a.kind
       of nkFloatLit..nkFloat64Lit: regs[ra].floatVal = a.floatVal
       else: stackTrace(c, tos, pc, errFieldXNotFound & "floatVal")
-    of opcNSymbol:
-      decodeB(rkNode)
-      let a = regs[rb].node
-      if a.kind == nkSym:
-        regs[ra].node = copyNode(a)
-      else:
-        stackTrace(c, tos, pc, errFieldXNotFound & "symbol")
-    of opcNIdent:
-      decodeB(rkNode)
-      let a = regs[rb].node
-      if a.kind == nkIdent:
-        regs[ra].node = copyNode(a)
-      else:
-        stackTrace(c, tos, pc, errFieldXNotFound & "ident")
     of opcNodeId:
       decodeB(rkInt)
       when defined(useNodeIds):
@@ -2159,20 +2142,6 @@ proc rawExecute(c: PCtx, start: int, tos: PStackFrame): TFullReg =
         dest.floatVal = regs[rb].floatVal
       else:
         stackTrace(c, tos, pc, errFieldXNotFound & "floatVal")
-    of opcNSetSymbol:
-      decodeB(rkNode)
-      var dest = regs[ra].node
-      if dest.kind == nkSym and regs[rb].node.kind == nkSym:
-        dest.sym = regs[rb].node.sym
-      else:
-        stackTrace(c, tos, pc, errFieldXNotFound & "symbol")
-    of opcNSetIdent:
-      decodeB(rkNode)
-      var dest = regs[ra].node
-      if dest.kind == nkIdent and regs[rb].node.kind == nkIdent:
-        dest.ident = regs[rb].node.ident
-      else:
-        stackTrace(c, tos, pc, errFieldXNotFound & "ident")
     of opcNSetStrVal:
       decodeB(rkNode)
       var dest = regs[ra].node

compiler/vmdef.nim

@@ -119,15 +119,13 @@ type
     opcNSymKind,
     opcNIntVal,
     opcNFloatVal,
-    opcNSymbol,
-    opcNIdent,
     opcNGetType,
     opcNStrVal,
     opcNSigHash,
     opcNGetSize,
 
     opcNSetIntVal,
-    opcNSetFloatVal, opcNSetSymbol, opcNSetIdent, opcNSetStrVal,
+    opcNSetFloatVal, opcNSetStrVal,
     opcNNewNimNode, opcNCopyNimNode, opcNCopyNimTree, opcNDel, opcGenSym,
 
     opcNccValue, opcNccInc, opcNcsAdd, opcNcsIncl, opcNcsLen, opcNcsAt,

compiler/vmgen.nim

@@ -803,8 +803,6 @@ proc genNarrow(c: PCtx; n: PNode; dest: TDest) =
     let first = c.genx(newIntTypeNode(firstOrd(c.config, t), intType))
     let last = c.genx(newIntTypeNode(lastOrd(c.config, t), intType))
     c.gABC(n, opcNarrowR, dest, first, last)
-    c.freeTemp(first)
-    c.freeTemp(last)
 
 proc genNarrowU(c: PCtx; n: PNode; dest: TDest) =
   let t = skipTypes(n.typ, abstractVar-{tyTypeDesc})
@@ -1375,8 +1373,6 @@ proc genMagic(c: PCtx; n: PNode; dest: var TDest; flags: TGenFlags = {}, m: TMag
 
   of mNIntVal: genUnaryABC(c, n, dest, opcNIntVal)
   of mNFloatVal: genUnaryABC(c, n, dest, opcNFloatVal)
-  of mNSymbol: genUnaryABC(c, n, dest, opcNSymbol)
-  of mNIdent: genUnaryABC(c, n, dest, opcNIdent)
   of mNGetType:
     let tmp = c.genx(n[1])
     if dest < 0: dest = c.getTemp(n.typ)
@@ -1403,12 +1399,6 @@ proc genMagic(c: PCtx; n: PNode; dest: var TDest; flags: TGenFlags = {}, m: TMag
   of mNSetFloatVal:
     unused(c, n, dest)
     genBinaryStmt(c, n, opcNSetFloatVal)
-  of mNSetSymbol:
-    unused(c, n, dest)
-    genBinaryStmt(c, n, opcNSetSymbol)
-  of mNSetIdent:
-    unused(c, n, dest)
-    genBinaryStmt(c, n, opcNSetIdent)
   of mNSetStrVal:
     unused(c, n, dest)
     genBinaryStmt(c, n, opcNSetStrVal)
@@ -1588,6 +1578,7 @@ proc genAsgn(c: PCtx; dest: TDest; ri: PNode; requiresCopy: bool) =
 proc setSlot(c: PCtx; v: PSym) =
   # XXX generate type initialization here?
   if v.position == 0:
+    # IC: review this solution again later
     v.positionImpl = getFreeRegister(c, if v.kind == skLet: slotFixedLet else: slotFixedVar, start = 1)
 
 template cannotEval(c: PCtx; n: PNode) =

compiler/vtables.nim

@@ -82,7 +82,7 @@ proc containGenerics(base: PType, s: seq[tuple[depth: int, value: PType]]): bool
       break
 
 proc collectVTableDispatchers*(g: ModuleGraph) =
-  var itemTable = initTable[ItemId, seq[PSym]]()
+  var itemTable = initTable[ItemId, seq[LazySym]]()
   var rootTypeSeq = newSeq[PType]()
   var rootItemIdCount = initCountTable[ItemId]()
   for bucket in 0..<g.methods.len:
@@ -95,7 +95,7 @@ proc collectVTableDispatchers*(g: ModuleGraph) =
       let methodIndexLen = g.bucketTable[baseType.itemId]
       if baseType.itemId notin itemTable: # once is enough
         rootTypeSeq.add baseType
-        itemTable[baseType.itemId] = newSeq[PSym](methodIndexLen)
+        itemTable[baseType.itemId] = newSeq[LazySym](methodIndexLen)
 
         sort(g.objectTree[baseType.itemId], cmp = proc (x, y: tuple[depth: int, value: PType]): int =
           if x.depth >= y.depth: 1
@@ -104,7 +104,7 @@ proc collectVTableDispatchers*(g: ModuleGraph) =
 
         for item in g.objectTree[baseType.itemId]:
           if item.value.itemId notin itemTable:
-            itemTable[item.value.itemId] = newSeq[PSym](methodIndexLen)
+            itemTable[item.value.itemId] = newSeq[LazySym](methodIndexLen)
 
       var mIndex = 0 # here is the correpsonding index
       if baseType.itemId notin rootItemIdCount:
@@ -114,13 +114,13 @@ proc collectVTableDispatchers*(g: ModuleGraph) =
         rootItemIdCount.inc(baseType.itemId)
       for idx in 0..<g.methods[bucket].methods.len:
         let obj = g.methods[bucket].methods[idx].typ.firstParamType.skipTypes(skipPtrs)
-        itemTable[obj.itemId][mIndex] = g.methods[bucket].methods[idx]
+        itemTable[obj.itemId][mIndex] = LazySym(sym: g.methods[bucket].methods[idx])
       g.addDispatchers genVTableDispatcher(g, g.methods[bucket].methods, mIndex)
     else: # if the base object doesn't have this method
       g.addDispatchers genIfDispatcher(g, g.methods[bucket].methods, relevantCols, g.idgen)
 
 proc sortVTableDispatchers*(g: ModuleGraph) =
-  var itemTable = initTable[ItemId, seq[PSym]]()
+  var itemTable = initTable[ItemId, seq[LazySym]]()
   var rootTypeSeq = newSeq[ItemId]()
   var rootItemIdCount = initCountTable[ItemId]()
   for bucket in 0..<g.methods.len:
@@ -133,7 +133,7 @@ proc sortVTableDispatchers*(g: ModuleGraph) =
       let methodIndexLen = g.bucketTable[baseType.itemId]
       if baseType.itemId notin itemTable: # once is enough
         rootTypeSeq.add baseType.itemId
-        itemTable[baseType.itemId] = newSeq[PSym](methodIndexLen)
+        itemTable[baseType.itemId] = newSeq[LazySym](methodIndexLen)
 
         sort(g.objectTree[baseType.itemId], cmp = proc (x, y: tuple[depth: int, value: PType]): int =
           if x.depth >= y.depth: 1
@@ -142,7 +142,7 @@ proc sortVTableDispatchers*(g: ModuleGraph) =
 
         for item in g.objectTree[baseType.itemId]:
           if item.value.itemId notin itemTable:
-            itemTable[item.value.itemId] = newSeq[PSym](methodIndexLen)
+            itemTable[item.value.itemId] = newSeq[LazySym](methodIndexLen)
 
       var mIndex = 0 # here is the correpsonding index
       if baseType.itemId notin rootItemIdCount:
@@ -152,7 +152,7 @@ proc sortVTableDispatchers*(g: ModuleGraph) =
         rootItemIdCount.inc(baseType.itemId)
       for idx in 0..<g.methods[bucket].methods.len:
         let obj = g.methods[bucket].methods[idx].typ.firstParamType.skipTypes(skipPtrs)
-        itemTable[obj.itemId][mIndex] = g.methods[bucket].methods[idx]
+        itemTable[obj.itemId][mIndex] = LazySym(sym: g.methods[bucket].methods[idx])
 
   for baseType in rootTypeSeq:
     g.setMethodsPerType(baseType, itemTable[baseType])
@@ -160,7 +160,7 @@ proc sortVTableDispatchers*(g: ModuleGraph) =
       let typ = item.value.skipTypes(skipPtrs)
       let idx = typ.itemId
       for mIndex in 0..<itemTable[idx].len:
-        if itemTable[idx][mIndex] == nil:
+        if itemTable[idx][mIndex].sym == nil:
           let parentIndex = typ.baseClass.skipTypes(skipPtrs).itemId
           itemTable[idx][mIndex] = itemTable[parentIndex][mIndex]
       g.setMethodsPerType(idx, itemTable[idx])

doc/advopt.txt

@@ -115,7 +115,6 @@ Advanced options:
   --docSeeSrcUrl:url        activate 'see source' for doc command
                             (see doc.item.seesrc in config/nimdoc.cfg)
   --docInternal             also generate documentation for non-exported symbols
-  --raw                     turn off markup rendering for JSON docs
   --lineDir:on|off          generation of #line directive on|off
   --embedsrc:on|off         embeds the original source code as comments
                             in the generated output

doc/ic.md

@@ -1,166 +0,0 @@
-======================================
-  Incremental Compilation (IC)
-======================================
-
-The ``nim ic`` command provides incremental compilation support for Nim projects,
-allowing faster rebuilds by reusing previously compiled intermediate representations
-of modules that haven't changed.
-
-Overview
-========
-
-Incremental compilation works by decomposing the compilation process into several stages:
-
-1. **Parsing** - Source files are parsed into an abstract syntax tree (AST)
-2. **Semantic Analysis** - Symbols are resolved and type checking is performed
-3. **Code Generation** - Platform-specific code is generated from the analyzed AST
-4. **Linking** - The generated code is linked into an executable
-
-The IC mechanism caches the results of earlier stages in NIF files
-(Nim intermediate format): ``.p.nif`` (parsed), ``.deps.nif`` (dependencies),
-and ``.nif`` (semantically analyzed). When recompiling, only modules that have
-changed need to be reprocessed through the semantic analysis and code generation
-stages, significantly reducing compilation time for large projects.
-
-NIF File Format
-===============
-
-NIF (Nim Intermediate Format) files are text-based files that use a Lisp-like
-syntax. They employ a hybrid format where byte offsets into the text are used for
-efficient access, making them simultaneously human-readable and machine-efficient.
-The text representation is particularly valuable for debugging and introspection.
-
-Each ``.nim`` module produces its own ``.nif`` file during compilation.
-The NIF format contains:
-
-- **Header** - Version information (e.g., `(.nif26)`)
-- **Dependencies** - List of source files and dependencies
-- **Interface** - Exported symbols and their indices
-- **Body** - The intermediate representation of the module's code in Lisp-like syntax
-
-The NIF format is designed specifically for Nim and allows efficient serialization
-and deserialization of the compiler's intermediate representation while remaining
-readable and debuggable by tools and developers.
-
-The ``nim ic`` Switch
-=====================
-
-The ``nim ic`` command initiates incremental compilation for a project.
-It automatically manages the build process by:
-
-1. Parsing all source files into ``.nif`` format (using the ``nifler`` tool)
-2. Performing semantic analysis on modified modules
-3. Generating code only for modules with changes or dependencies on changed modules
-4. Generating a build file (in NIFMake format) that orchestrates the compilation
-5. Executing the build file through ``nifmake``
-
-Prerequisites
--------------
-
-- **nifler** - Tool for parsing Nim source files into NIF format. The ``nim ic`` command uses ``nifler parse --deps`` to generate both parsed files (``.p.nif``) and dependency files (``.deps.nif``).
-- **nifmake** - Build orchestration tool that follows dependencies and executes the build rules defined in ``.build.nif`` files.
-
-If these tools are not available, ``nim ic`` will display instructions on how to
-obtain them.
-
-Key Modules for IC Logic
-=========================
-
-The primary modules in the compiler that handle incremental compilation logic are:
-
-- **deps.nim** - Dependency analysis and build file generation. Contains the
-  ``commandIc`` procedure which is the main entry point for the ``nim ic`` command.
-  This module orchestrates the incremental compilation process, handling dependency
-  traversal (via ``nifler deps``), build rule generation, and build file creation.
-  The build file is written to ``nifcache/`` directory. This module also explicitly
-  models ``system.nim`` as a dependency of all modules.
-
-- **ast2nif.nim** - Core mapping between AST and NIF.
-
-
-**Code, Logic & Debugging**
-===========================
-
-This section focuses on the compiler-side code paths, the logic you will
-inspect while debugging IC, and a pragmatic manual workflow for bug hunting
-using local invocations such as ``nim m --nimcache:nifcache``.
-
-Core places to inspect
-- **`compiler/deps.nim`**: generates the NIF-based build file and implements
-  ``commandIc`` (entry point for ``nim ic``). Look for how build rules are
-  emitted (calls to the NIF builder) and how inputs/outputs are wired.
-- **`compiler/modulegraphs.nim`** and **`compiler/pipelines.nim`**:
-  dependency graph and compilation pipeline integration — useful when a module
-  is rebuilt unexpectedly.
-
-Understanding the NIF text
-- NIF files are human-readable; open the per-module ``.nif`` files in
-  ``nifcache/`` to inspect parsed ASTs, dependency lists and interface tables.
-- Because NIF uses textual nodes and byte offsets, tools can quickly seek to
-  positions in the file — but for debugging you usually only need to read the
-  file top-to-bottom.
-
-Manual bug-hunting workflow
-- Prepare a clean nimcache directory (relative to your project):
-
-  ```bash
-  mkdir -p nifcache
-  ```
-
-- Parse/semantic-check a single module and write NIF/sem artifacts:
-
-  ```bash
-  nim m --nimcache:nifcache path/to/module.nim
-  ```
-
-  - ``nim m`` runs the compiler up to the semantic checking stage for the
-    specified module and emits intermediate cache files into ``nifcache/``.
-  - Use this to reproduce and isolate failures in the semantic stage.
-
-- Inspect the generated files for that module under ``nifcache/`` (look for
-  ``.nif``, sem/parsed artifacts). Because NIF is text-based you can open and
-  grep it directly:
-
-  ```bash
-  sed -n '1,200p' nifcache/ModuleName.nif
-  grep -n "someSymbol" -n nifcache/ModuleName.nif
-  ```
-
-- To reproduce a full incremental compilation of the project, generate the
-  build file and run it (``nim ic`` automates this). The build file is generated
-  in ``nifcache/`` directory. To debug an individual build step, run the command
-  that the build file would execute manually:
-  - Parsing step: ``nifler parse --deps input.nim`` (produces ``.p.nif`` and ``.deps.nif``)
-  - Semantic step: ``nim m --nimcache:nifcache input.nim`` (produces ``.nif``)
-  - Code generation: ``nim nifc --nimcache:nifcache input.nim`` (produces executable)
-
-- Force a cache invalidation for a single module by removing its NIF/sem
-  artifact and re-running the semantic step:
-
-  ```bash
-  rm nifcache/ModuleName.nif
-  nim m --nimcache:nifcache path/to/ModuleName.nim
-  ```
-
-- When investigating incorrect replayed state (pragmas, `{.compile: ...}`):
-  inspect the replay actions in ``compiler/ic/replayer.nim`` and open the
-  module's NIF to find the ``toReplay``/action entries that will be executed
-  during reload.
-
-Tips for efficient debugging
-- Use ``--path:...`` flags when invoking ``nim m`` to emulate the exact
-  search paths used in your project, e.g. ``--path:lib --path:vendor``.
-- Compare two successive ``.nif`` files with ``diff`` to see what changed and
-  why a module was rebuilt.
-
-Where to change behavior
-- Cache invalidation decisions and build-rule emission are implemented in
-  ``compiler/deps.nim``. When investigating surprising
-  rebuilds, instrument those modules to log the footprint/hash/comparison
-  outcome.
-
-See also
-========
-
-- `nif-spec` - NIF format specification (text format and node grammar):
-  [nifspec/doc/nif-spec.md](../nifspec/doc/nif-spec.md)

koch.nim

@@ -16,7 +16,7 @@ const
   ChecksumsStableCommit = "0b8e46379c5bc1bf73d8b3011908389c60fb9b98" # 2.0.1
   SatStableCommit = "faf1617f44d7632ee9601ebc13887644925dcc01"
 
-  NimonyStableCommit = "deb9b50c573fb55e071825ab55385e293b7216d5" # unversioned \
+  NimonyStableCommit = "fc8baa61b9911caf4666685a5f5ed41b9c04f6f8" # unversioned \
     # Note that Nimony uses Nim as a git submodule but we don't want to install
     # Nimony's dependency to Nim as we are Nim. So a `git clone` without --recursive
     # is **required** here.
@@ -558,7 +558,9 @@ proc icTest(args: string) =
   for fragment in content.split("#!EDIT!#"):
     let file = inp.replace(".nim", "_temp.nim")
     writeFile(file, fragment)
-    var cmd = nimExe & " ic --hint:Conf:off --warnings:off "
+    var cmd = nimExe & " cpp --ic:legacy -d:nimIcIntegrityChecks --listcmd "
+    if i == 0:
+      cmd.add "-f "
     cmd.add quoteShell(file)
     exec(cmd)
     inc i

lib/core/macros.nim

@@ -117,7 +117,6 @@ type
     ntyCompositeTypeClass, ntyInferred, ntyAnd, ntyOr, ntyNot,
     ntyAnything, ntyStatic, ntyFromExpr, ntyOptDeprecated, ntyVoid
 
-  TNimTypeKinds* {.deprecated.} = set[NimTypeKind]
   NimSymKind* = enum
     nskUnknown, nskConditional, nskDynLib, nskParam,
     nskGenericParam, nskTemp, nskModule, nskType, nskVar, nskLet,
@@ -127,24 +126,10 @@ type
     nskEnumField, nskForVar, nskLabel,
     nskStub
 
-  TNimSymKinds* {.deprecated.} = set[NimSymKind]
-
 const
   nnkMutableTy* {.deprecated.} = nnkOutTy
   nnkSharedTy* {.deprecated.} = nnkSinkAsgn
 
-type
-  NimIdent* {.deprecated.} = object of RootObj
-    ## Represents a Nim identifier in the AST. **Note**: This is only
-    ## rarely useful, for identifier construction from a string
-    ## use `ident"abc"`.
-
-  NimSymObj = object # hidden
-  NimSym* {.deprecated.} = ref NimSymObj
-    ## Represents a Nim *symbol* in the compiler; a *symbol* is a looked-up
-    ## *ident*.
-
-
 const
   nnkLiterals* = {nnkCharLit..nnkNilLit}
   # see matching set CallNodes below
@@ -152,26 +137,10 @@ const
                    nnkCallStrLit, nnkHiddenCallConv}
   nnkPragmaCallKinds = {nnkExprColonExpr, nnkCall, nnkCallStrLit}
 
-{.push warnings: off.}
-
-proc toNimIdent*(s: string): NimIdent {.magic: "StrToIdent", noSideEffect, deprecated:
-  "Deprecated since version 0.18.0: Use 'ident' or 'newIdentNode' instead.".}
-  ## Constructs an identifier from the string `s`.
-
-proc `==`*(a, b: NimIdent): bool {.magic: "EqIdent", noSideEffect, deprecated:
-  "Deprecated since version 0.18.1; Use '==' on 'NimNode' instead.".}
-  ## Compares two Nim identifiers.
-
 proc `==`*(a, b: NimNode): bool {.magic: "EqNimrodNode", noSideEffect.}
   ## Compare two Nim nodes. Return true if nodes are structurally
   ## equivalent. This means two independently created nodes can be equal.
 
-proc `==`*(a, b: NimSym): bool {.magic: "EqNimrodNode", noSideEffect, deprecated:
-  "Deprecated since version 0.18.1; Use '==(NimNode, NimNode)' instead.".}
-  ## Compares two Nim symbols.
-
-{.pop.}
-
 proc sameType*(a, b: NimNode): bool {.magic: "SameNodeType", noSideEffect.} =
   ## Compares two Nim nodes' types. Return true if the types are the same,
   ## e.g. true when comparing alias with original type.
@@ -252,25 +221,6 @@ proc strVal*(n: NimNode): string  {.magic: "NStrVal", noSideEffect.}
   ## See also:
   ## * `strVal= proc<#strVal=,NimNode,string>`_ for setting the string value.
 
-{.push warnings: off.} # silence `deprecated`
-
-proc ident*(n: NimNode): NimIdent {.magic: "NIdent", noSideEffect, deprecated:
-  "Deprecated since version 0.18.1; All functionality is defined on 'NimNode'.".}
-
-proc symbol*(n: NimNode): NimSym {.magic: "NSymbol", noSideEffect, deprecated:
-  "Deprecated since version 0.18.1; All functionality is defined on 'NimNode'.".}
-
-proc getImpl*(s: NimSym): NimNode {.magic: "GetImpl", noSideEffect, deprecated: "use `getImpl: NimNode -> NimNode` instead".}
-
-proc `$`*(i: NimIdent): string {.magic: "NStrVal", noSideEffect, deprecated:
-  "Deprecated since version 0.18.1; Use 'strVal' instead.".}
-  ## Converts a Nim identifier to a string.
-
-proc `$`*(s: NimSym): string {.magic: "NStrVal", noSideEffect, deprecated:
-  "Deprecated since version 0.18.1; Use 'strVal' instead.".}
-  ## Converts a Nim symbol to a string.
-
-{.pop.}
 
 when (NimMajor, NimMinor, NimPatch) >= (1, 3, 5) or defined(nimSymImplTransform):
   proc getImplTransformed*(symbol: NimNode): NimNode {.magic: "GetImplTransf", noSideEffect.}
@@ -373,15 +323,6 @@ proc getTypeImpl*(n: typedesc): NimNode {.magic: "NGetType", noSideEffect.}
 proc `intVal=`*(n: NimNode, val: BiggestInt) {.magic: "NSetIntVal", noSideEffect.}
 proc `floatVal=`*(n: NimNode, val: BiggestFloat) {.magic: "NSetFloatVal", noSideEffect.}
 
-{.push warnings: off.}
-
-proc `symbol=`*(n: NimNode, val: NimSym) {.magic: "NSetSymbol", noSideEffect, deprecated:
-  "Deprecated since version 0.18.1; Generate a new 'NimNode' with 'genSym' instead.".}
-
-proc `ident=`*(n: NimNode, val: NimIdent) {.magic: "NSetIdent", noSideEffect, deprecated:
-  "Deprecated since version 0.18.1; Generate a new 'NimNode' with 'ident(string)' instead.".}
-
-{.pop.}
 
 proc `strVal=`*(n: NimNode, val: string) {.magic: "NSetStrVal", noSideEffect.}
   ## Sets the string value of a string literal or comment.
@@ -464,14 +405,6 @@ proc newFloatLitNode*(f: BiggestFloat): NimNode =
   result = newNimNode(nnkFloatLit)
   result.floatVal = f
 
-{.push warnings: off.}
-
-proc newIdentNode*(i: NimIdent): NimNode {.deprecated: "use ident(string)".} =
-  ## Creates an identifier node from `i`.
-  result = newNimNode(nnkIdent)
-  result.ident = i
-
-{.pop.}
 
 proc newIdentNode*(i: string): NimNode {.magic: "StrToIdent", noSideEffect.}
   ## Creates an identifier node from `i`. It is simply an alias for
@@ -722,17 +655,6 @@ proc newCall*(theProc: NimNode, args: varargs[NimNode]): NimNode =
   result.add(theProc)
   result.add(args)
 
-{.push warnings: off.}
-
-proc newCall*(theProc: NimIdent, args: varargs[NimNode]): NimNode {.deprecated:
-  "Deprecated since v0.18.1; use 'newCall(string, ...)' or 'newCall(NimNode, ...)' instead".} =
-  ## Produces a new call node. `theProc` is the proc that is called with
-  ## the arguments `args[0..]`.
-  result = newNimNode(nnkCall)
-  result.add(newIdentNode(theProc))
-  result.add(args)
-
-{.pop.}
 
 proc newCall*(theProc: string,
               args: varargs[NimNode]): NimNode =

lib/experimental/diff.nim

@@ -338,63 +338,3 @@ proc diffText*(textA, textB: string): seq[Item] =
   optimize(dataA)
   optimize(dataB)
   result = createDiffs(dataA, dataB)
-
-proc renderDiff*(a, b: string; res: seq[Item]): string =
-  ## Renders a diff between two strings as a human-readable unified diff format.
-  ##
-  ## `a` the original text
-  ## `b` the modified text
-  ## `res` the sequence of Items from `diffText(a, b)`
-  ##
-  ## Returns a string with the diff output where:
-  ## - Lines prefixed with `-` are deletions from `a`
-  ## - Lines prefixed with `+` are insertions in `b`
-  ## - Lines prefixed with ` ` are context (unchanged)
-  runnableExamples:
-    let a = "line1\nline2\nline3"
-    let b = "line1\nmodified\nline3"
-    let diff = diffText(a, b)
-    let rendered = renderDiff(a, b, diff)
-    assert "-line2" in rendered
-    assert "+modified" in rendered
-
-  let linesA = a.splitLines
-  let linesB = b.splitLines
-
-  var posA = 0
-  var posB = 0
-
-  for item in res:
-    # Add context lines before this change
-    while posA < item.startA and posB < item.startB:
-      result.add ' '
-      result.add linesA[posA]
-      result.add '\n'
-      inc posA
-      inc posB
-
-    # Add deleted lines from A
-    for i in 0 ..< item.deletedA:
-      result.add '-'
-      result.add linesA[item.startA + i]
-      result.add '\n'
-
-    # Add inserted lines from B
-    for i in 0 ..< item.insertedB:
-      result.add '+'
-      result.add linesB[item.startB + i]
-      result.add '\n'
-
-    posA = item.startA + item.deletedA
-    posB = item.startB + item.insertedB
-
-  # Add remaining context lines after the last change
-  while posA < linesA.len and posB < linesB.len:
-    result.add ' '
-    result.add linesA[posA]
-    result.add '\n'
-    inc posA
-    inc posB
-
-proc diffOutput*(a, b: string): string =
-  renderDiff(a, b, diffText(a, b))

lib/system.nim

@@ -3141,27 +3141,3 @@ proc arrayWithDefault*[T](size: static int): array[size, T] {.noinit, nodestroy,
   ## Creates a new array filled with `default(T)`.
   for i in 0..size-1:
     result[i] = default(T)
-
-when hostOS == "standalone":
-  # Include panicoverride.nim late so users can use the full extent of the
-  # language in their custom panic handlers (e.g. macros).
-  # Users define `proc panic(msg: string)` and `proc rawoutput(msg: string)`.
-  include "$projectpath/panicoverride"
-
-  when not declared(panic):
-    {.error:
-      "a panic proc with the following signature must be provided " &
-      "when compiling with --os:standalone: " &
-      "`proc panic(msg: string) {.nimcall.}`".}
-
-  when not declared(rawoutput):
-     {.error:
-      "a rawoutput proc with the following signature must be provided " &
-      "when compiling with --os:standalone: " &
-      "`proc rawoutput(msg: string) {.nimcall.}`".}
-
-  # Wrappers with exportc that fatal.nim references via importc.
-  # This way panicoverride keeps old API and can still be included without
-  # ssymbols being duplicated.
-  proc nimPanic(s: string) {.exportc, noreturn.} = panic(s)
-  proc nimRawoutput(s: string) {.exportc.} = rawoutput(s)

lib/system/fatal.nim

@@ -14,23 +14,14 @@ const
   quirkyExceptions = compileOption("exceptions", "quirky")
 
 when hostOS == "standalone":
-  # These procs are defined in panicoverride.nim, which gets included at end
-  # of system.nim with exportc.
-  proc nimPanic(msg: string) {.importc: "nimPanic", noreturn.}
-  proc nimRawoutput(msg: string) {.importc: "nimRawoutput".}
+  include "$projectpath/panicoverride"
 
-  proc sysFatal(exceptn: typedesc[Defect], message: string) {.inline, noreturn, raises: [], tags: [].} =
-    {.cast(noSideEffect).}:
-      {.cast(raises: []).}:
-        {.cast(tags: []).}:
-          nimPanic(message)
+  func sysFatal(exceptn: typedesc[Defect], message: string) {.inline.} =
+    panic(message)
 
-  proc sysFatal(exceptn: typedesc[Defect], message, arg: string) {.inline, noreturn, raises: [], tags: [].} =
-    {.cast(noSideEffect).}:
-      {.cast(raises: []).}:
-        {.cast(tags: []).}:
-          nimRawoutput(message)
-          nimPanic(arg)
+  func sysFatal(exceptn: typedesc[Defect], message, arg: string) {.inline.} =
+    rawoutput(message)
+    panic(arg)
 
 elif quirkyExceptions and not defined(nimscript):
   import ansi_c

nimsuggest/nimsuggest.nim

@@ -237,7 +237,7 @@ proc clearInstCache(graph: ModuleGraph, projectFileIdx: FileIndex) =
   for tbl in mitems(graph.attachedOps):
     var attachedOpsToDelete = newSeq[ItemId]()
     for id in tbl.keys:
-      if id.module == projectFileIdx.int and sfOverridden in tbl[id].flags:
+      if id.module == projectFileIdx.int and sfOverridden in resolveAttachedOp(graph, tbl[id]).flags:
         attachedOpsToDelete.add id
     for id in attachedOpsToDelete:
       tbl.del id

testament/categories.nim

@@ -27,7 +27,6 @@ const
     "io",
     "js",
     "ic",
-    "ic_disabled",
     "lib",
     "manyloc",
     "nimble-packages",
@@ -490,16 +489,46 @@ proc testNimblePackages(r: var TResults; cat: Category; packageFilter: string) =
 
 proc icTests(r: var TResults; testsDir: string, cat: Category, options: string;
              isNavigatorTest: bool) =
-  template editedTest() =
-    var test = makeTest(file, options, cat)
-    test.spec.targets = {targetC}
-    test.spec.cmd = compilerPrefix & " ic --hint:Conf:off --warnings:off $options " & file
+  const
+    tooltests = ["compiler/nim.nim"]
+    writeOnly = " --incremental:writeonly "
+    readOnly = " --incremental:readonly "
+    incrementalOn = " --incremental:legacy -d:nimIcIntegrityChecks "
+    navTestConfig = " --ic:legacy -d:nimIcNavigatorTests --hint:Conf:off --warnings:off "
+
+  template test(x: untyped) =
+    testSpecWithNimcache(r, makeRawTest(file, x & options, cat), nimcache)
+
+  template editedTest(x: untyped) =
+    var test = makeTest(file, x & options, cat)
+    if isNavigatorTest:
+      test.spec.action = actionCompile
+    test.spec.targets = {getTestSpecTarget()}
     testSpecWithNimcache(r, test, nimcache)
 
+  template checkTest() =
+    var test = makeRawTest(file, options, cat)
+    test.spec.cmd = compilerPrefix & " check --hint:Conf:off --warnings:off --ic:legacy $options " & file
+    testSpecWithNimcache(r, test, nimcache)
+
+  if not isNavigatorTest:
+    for file in tooltests:
+      let nimcache = nimcacheDir(file, options, getTestSpecTarget())
+      removeDir(nimcache)
+
+      let oldPassed = r.passed
+      checkTest()
+
+      if r.passed == oldPassed+1:
+        checkTest()
+        if r.passed == oldPassed+2:
+          checkTest()
+
   const tempExt = "_temp.nim"
   for it in walkDirRec(testsDir):
+  # for it in ["tests/ic/timports.nim"]: # debugging: to try a specific test
     if isTestFile(it) and not it.endsWith(tempExt):
-      let nimcache = nimcacheDir(it, options, targetC)
+      let nimcache = nimcacheDir(it, options, getTestSpecTarget())
       removeDir(nimcache)
 
       let content = readFile(it)
@@ -507,7 +536,7 @@ proc icTests(r: var TResults; testsDir: string, cat: Category, options: string;
         let file = it.replace(".nim", tempExt)
         writeFile(file, fragment)
         let oldPassed = r.passed
-        editedTest()
+        editedTest(if isNavigatorTest: navTestConfig else: incrementalOn)
         if r.passed != oldPassed+1: break
 
 # ----------------------------------------------------------------------------

testament/important_packages.nim

@@ -43,7 +43,7 @@ when not defined(arm64):
 pkg "awk"
 pkg "bigints"
 pkg "binaryheap", "nim c -r binaryheap.nim"
-pkg "BipBuffer"
+pkg "BipBuffer", url = "https://github.com/nim-lang/BipBuffer"
 pkg "bncurve"
 pkg "brainfuck", "nim c -d:release -r tests/compile.nim"
 pkg "c2nim", "nim c testsuite/tester.nim"
@@ -112,7 +112,7 @@ else:
 pkg "nimcrypto", "nim r --path:. tests/testall.nim" # `--path:.` workaround needed, see D20210308T165435
 pkg "NimData", "nim c -o:nimdataa src/nimdata.nim"
 pkg "nimes", "nim c src/nimes.nim"
-pkg "nimfp", "nim c -o:nfp -r src/fp.nim"
+# pkg "nimfp", "nim c -o:nfp -r src/fp.nim"
 pkg "nimgame2", "nim c --mm:refc nimgame2/nimgame.nim"
 pkg "nimgen", "nim c -o:nimgenn -r src/nimgen/runcfg.nim"
 pkg "nimib"
@@ -168,7 +168,7 @@ pkg "taskpools"
 pkg "telebot", "nim c -o:tbot -r src/telebot.nim"
 pkg "tempdir"
 pkg "templates"
-pkg "tensordsl", "nim c -r --mm:refc tests/tests.nim", "https://krux02@bitbucket.org/krux02/tensordslnim.git"
+# pkg "tensordsl", "nim c -r --mm:refc tests/tests.nim", "https://krux02@bitbucket.org/krux02/tensordslnim.git"
 pkg "terminaltables", "nim c src/terminaltables.nim"
 pkg "termstyle", "nim c -r termstyle.nim"
 pkg "testutils"

tests/assert/panicoverride.nim

@@ -5,11 +5,11 @@ proc exit(code: cint) {.importc, header:"stdlib.h".}
 
 {.push stack_trace: off, profiler:off.}
 
-proc rawoutput(s: string) =
-  printf("RAW: %s\n", s.cstring)
-
-proc panic(s: string) {.noreturn.} =
-  printf("PANIC: %s\n", s.cstring)
+proc rawoutput(s: cstring) =
+  printf("RAW: %s\n", s)
+  
+proc panic(s: cstring) {.noreturn.} =
+  printf("PANIC: %s\n", s)
   exit(0)
 
 {.pop.}

tests/avr/panicoverride.nim

@@ -4,9 +4,9 @@ proc exit(code: int) {.importc, header: "<stdlib.h>", cdecl.}
 {.push stack_trace: off, profiler:off.}
 
 proc rawoutput(s: string) =
-  printf("%s\n", s.cstring)
+  printf("%s\n", s)
 
-proc panic(s: string) {.noreturn.} =
+proc panic(s: string) =
   rawoutput(s)
   exit(1)
 

tests/ccgbugs2/m25459/g.nim

@@ -1,11 +0,0 @@
-proc v[T](_: typedesc[T]): int =
-  if T is int64: 6 else: 4
-
-type
-  D*[T] = object
-    c*: seq[T]
-    k*: array[v(T), int]
-  F = distinct int64
-  W* = object
-    y: D[F]
-    j*: D[int64]

tests/ccgbugs2/m25459/h.nim

@@ -1,8 +0,0 @@
-import ./g
-export g
-
-proc a*(): W =
-  var e = D[int64]()
-  e.c.setLen(8)
-  e.k[1] = 0
-  result = W(j: e)

tests/ccgbugs2/t25459.nim

@@ -1,10 +0,0 @@
-discard """
-  targets: "c cpp"
-  matrix: "-d:checkAbi"
-"""
-
-import ./m25459/h
-
-for _ in 0 ..< 500:
-  let u = new W
-  u[] = a()

tests/ccgbugs2/t25459b.nim

@@ -1,31 +0,0 @@
-discard """
-  targets: "c cpp"
-  matrix: "-d:checkAbi"
-"""
-
-proc v[T](_: typedesc[T]): int =
-  if T is int64: 2 else: 1
-
-type
-  D[T] = object
-    k: array[v(T), int]
-  E[T] = object
-    k: array[v(T), int]
-  F = distinct int64
-  W = object
-    a: D[int64]
-    b: D[F]
-
-proc csizeof[T](x {.bycopy.} : T): cint {.importc: "sizeof", nodecl.}
-
-var w: W
-assert sizeof(w) == csizeof(w)
-
-var
-  e0: E[F]
-  e1: E[int64]
-assert sizeof(e0) == csizeof(e0)
-assert sizeof(e1) == csizeof(e1)
-
-var tup: (E[F], E[int64])
-assert sizeof(tup) == csizeof(tup)

tests/effects/teffects8.nim

@@ -1,5 +1,5 @@
 discard """
-  errormsg: "ValueError can raise an unlisted exception: ValueError"
+  errormsg: "can raise an unlisted exception: Exception"
   line: 10
 """
 {.push warningAsError[Effect]: on.}

tests/effects/teffectsmisc.nim

@@ -37,24 +37,3 @@ block:
 
   let newAdder = makeAdder(0)
   newAdder(5)
-
-block:
-  proc g() = discard
-  proc f() {.raises: [IOError].} =
-    try:
-      g()
-    except IOError:
-      raise
-
-  f()
-
-
-block:
-  proc g() = discard
-  proc f() {.raises: [IOError].} =
-    try:
-      g()
-    except IOError as e:
-      raise
-
-  f()

tests/errmsgs/t14444.nim

@@ -3,7 +3,7 @@ discard """
   exitcode: "1"
   output: '''
 t14444.nim(13)           t14444
-fatal.nim(62)            sysFatal
+fatal.nim(53)            sysFatal
 Error: unhandled exception: index out of bounds, the container is empty [IndexDefect]
 '''
 """

tests/errmsgs/t23536.nim

@@ -8,7 +8,7 @@ t23536.nim(22)           t23536
 t23536.nim(17)           foo
 assertions.nim(45)       failedAssertImpl
 assertions.nim(40)       raiseAssert
-fatal.nim(62)            sysFatal
+fatal.nim(53)            sysFatal
 """
 
 

tests/errmsgs/t24974.nim

@@ -6,7 +6,7 @@ t24974.nim(19)           d
 t24974.nim(16)           s
 assertions.nim(45)       failedAssertImpl
 assertions.nim(40)       raiseAssert
-fatal.nim(62)            sysFatal
+fatal.nim(53)            sysFatal
 Error: unhandled exception: t24974.nim(16, 26) `false`  [AssertionDefect]
 '''
 """

tests/exception/t22469.nim

@@ -3,7 +3,7 @@ discard """
   output: '''
 First top-level statement of ModuleB
 m22469.nim(3)            m22469
-fatal.nim(62)            sysFatal
+fatal.nim(53)            sysFatal
 Error: unhandled exception: over- or underflow [OverflowDefect]
 '''
 """

tests/gc/panicoverride.nim

@@ -5,7 +5,7 @@ proc exit(code: int) {.importc, header: "<stdlib.h>", cdecl.}
 {.push stack_trace: off, profiler:off.}
 
 proc rawoutput(s: string) =
-  printf("%s\n", s.cstring)
+  printf("%s\n", s)
 
 proc panic(s: string) {.noreturn.} =
   rawoutput(s)

tests/generics/tvoids.nim

@@ -1,19 +0,0 @@
-block: # bug #25441
-  func foo[T](x: T, y: int) =
-    discard
-
-  foo[void](10)
-
-block:
-  func foo[T: void|float](e: openArray[int], x: T, y: int) =
-    discard
-
-  var x: seq[int]
-  foo[void] x, 2
-
-block: # bug #7355
-  proc gen[A: void, T: void|int](a: A, b: T) = discard
-
-  gen[void, void]()     # Works
-  gen[void, int] 0      # Crash
-  gen[void, int](b = 0) # Crash

tests/ic/myimp.nim

@@ -1,4 +0,0 @@
-
-proc foo*(x: var int) =
-  inc x
-

tests/ic/timp.nim

@@ -1,10 +0,0 @@
-discard """
-  output: "hi 1"
-"""
-
-import myimp
-
-var x = 0
-foo(x)
-
-echo "hi ", x

tests/ic/tparseutils.nim

@@ -1,10 +0,0 @@
-discard """
-  output: '''hello'''
-"""
-
-import parseutils
-
-var w = ""
-discard parseIdent("hello world", w)
-echo w
-

tests/js/t16726.nim

@@ -1,9 +0,0 @@
-discard """
-  errormsg: "type mismatch"
-"""
-
-# issue #16726
-# the code below should give a clean CT error, not an internal error
-import std/jsffi
-let a = toJs(3)
-let b = a.toJs(int)

tests/lexer/t25074.nim

@@ -1,6 +0,0 @@
-discard """
-  matrix: "--warningaserror:longliterals"
-  errormsg: "number has 64 digits but type only supports 16 digits: '0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff' [LongLiterals]"
-"""
-
-echo $sizeof 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff

tests/lookups/tgensymgeneric.nim

@@ -43,12 +43,8 @@ static:
   let sym1 = genSym()
   let sym2 = genSym()
   let sym3 = sym1
-  let nimsym = sym1.symbol
   doAssert sym1 == sym1
   doAssert sym2 != sym3
-  doAssert sym2.symbol != sym3.symbol
   doAssert sym3 == sym1
-  doAssert sym1.symbol == sym1.symbol
-  doAssert nimsym == nimsym
 
 echo "true"

tests/macros/t16758.nim

@@ -1,3 +1,7 @@
+discard """
+errormsg: "'blk.p(a)' has nil child at index 1"
+action: reject
+"""
 import macros
 
 type BlockLiteral[T] = object

tests/macros/tdumpast2.nim

@@ -11,8 +11,7 @@ proc dumpit(n: NimNode): string {.compileTime.} =
   of nnkNilLit:                  add(result, "nil")
   of nnkCharLit..nnkInt64Lit:    add(result, $n.intVal)
   of nnkFloatLit..nnkFloat64Lit: add(result, $n.floatVal)
-  of nnkStrLit..nnkTripleStrLit: add(result, $n.strVal)
-  of nnkIdent:                   add(result, $n.ident)
+  of nnkStrLit..nnkTripleStrLit, nnkIdent: add(result, $n.strVal)
   of nnkSym, nnkNone:            assert false
   else:
     add(result, dumpit(n[0]))

tests/macros/tmacros1.nim

@@ -21,7 +21,7 @@ macro outterMacro*(n, blck: untyped): untyped =
       "(the_name_you_want)): statements.")
   result = newNimNode(NimNodeKind.nnkStmtList)
   var ass : NimNode = newNimNode(nnkAsgn)
-  ass.add(newIdentNode(n[1].ident))
+  ass.add(n[1])
   ass.add(newStrLitNode(innerProc(4)))
   result.add(ass)
 

tests/manyloc/keineschweine/dependencies/genpacket/genpacket_enet.nim

@@ -18,7 +18,7 @@ macro defPacket*(typeNameN: untyped, typeFields: untyped): untyped =
   var
     constructorParams = newNimNode(nnkFormalParams).und(typeName)
     constructor = newNimNode(nnkProcDef).und(
-      postfix(^("new" & $typeName.ident), "*"),
+      postfix(^("new" & $typeName.strVal), "*"),
       emptyNode(),
       emptyNode(),
       constructorParams,
@@ -41,7 +41,7 @@ macro defPacket*(typeNameN: untyped, typeFields: untyped): untyped =
       emptyNode(),
       emptyNode())
     read = newNimNode(nnkProcDef).und(
-      newIdentNode("read" & $typeName.ident).postfix("*"),
+      newIdentNode("read" & $typeName.strVal).postfix("*"),
       emptyNode(),
       emptyNode(),
       newNimNode(nnkFormalParams).und(
@@ -63,14 +63,14 @@ macro defPacket*(typeNameN: untyped, typeFields: untyped): untyped =
       resName = newIdentNode("result").dot(name)
     case typeFields[i][1].kind
     of nnkBracketExpr: #ex: paddedstring[32, '\0'], array[range, type]
-      case $typeFields[i][1][0].ident
+      case $typeFields[i][1][0].strVal
       of "seq":
         ## let lenX = readInt16(s)
         newLenName()
         let
           item = ^"item"  ## item name in our iterators
           seqType = typeFields[i][1][1] ## type of seq
-          readName = newIdentNode("read" & $seqType.ident)
+          readName = newIdentNode("read" & $seqType.strVal)
         readBody.add(newNimNode(nnkLetSection).und(
           newNimNode(nnkIdentDefs).und(
             lenName,
@@ -102,17 +102,17 @@ macro defPacket*(typeNameN: untyped, typeFields: untyped): untyped =
       else:
         error("Unknown type: " & treeRepr(typeFields[i]))
     of nnkIdent: ##normal type
-      case $typeFields[i][1].ident
+      case $typeFields[i][1].strVal
       of "string": # length encoded string
         packBody.add(newCall("write", streamID, dotName))
         readBody.add(resName := newCall("readStr", streamID))
       of "int8", "int16", "int32", "float32", "float64", "char", "bool":
         packBody.add(newCall(
           "writeBE", streamID, dotName))
-        readBody.add(resName := newCall("read" & $typeFields[i][1].ident, streamID))
+        readBody.add(resName := newCall("read" & $typeFields[i][1].strVal, streamID))
       else:  ## hopefully the type you specified was another defpacket() type
         packBody.add(newCall("pack", streamID, dotName))
-        readBody.add(resName := newCall("read" & $typeFields[i][1].ident, streamID))
+        readBody.add(resName := newCall("read" & $typeFields[i][1].strVal, streamID))
     else:
       error("I don't know what to do with: " & treerepr(typeFields[i]))
 
@@ -137,7 +137,7 @@ macro defPacket*(typeNameN: untyped, typeFields: untyped): untyped =
           newNimNode(nnkCall).und(# [6][0][1]
             ^"format",  ## format
             emptyNode()))))  ## "[TypeName   $1   $2]"
-    formatStr = "[" & $typeName.ident
+    formatStr = "[" & $typeName.strVal
 
   const emptyFields = {nnkEmpty, nnkNilLit}
   var objFields = newNimNode(nnkRecList)
@@ -206,7 +206,7 @@ macro forwardPacket*(typeName: untyped, underlyingType: untyped): untyped =
     streamID = ^"s"
   result = newNimNode(nnkStmtList).und(
     newProc(
-      (^("read" & $typeName.ident)).postfix("*"),
+      (^("read" & $typeName.strVal)).postfix("*"),
       [ iddefs("s", "PBuffer", newNimNode(nnkNilLit)) ],
       typeName),
     newProc(
@@ -221,7 +221,7 @@ macro forwardPacket*(typeName: untyped, underlyingType: untyped): untyped =
 
   case underlyingType.kind
   of nnkBracketExpr:
-    case $underlyingType[0].ident
+    case $underlyingType[0].strVal
     of "array":
       for i in underlyingType[1][1].intval.int .. underlyingType[1][2].intval.int:
         readBody.add(

tests/manyloc/keineschweine/dependencies/genpacket/macro_dsl.nim

@@ -41,13 +41,13 @@ proc quoted2ident*(a: NimNode): NimNode {.compileTime.} =
     return a
   var pname = ""
   for piece in 0..a.len - 1:
-    pname.add($a[piece].ident)
+    pname.add($a[piece].strVal)
   result = ^pname
 
 
 macro `?`(a: untyped): untyped =
   ## Character literal ?A #=> 'A'
-  result = ($a[1].ident)[0].lit
+  result = ($a[1].strVal)[0].lit
 ## echo(?F,?a,?t,?t,?y)
 
 when false:

tests/manyloc/standalone/barebone.nim

@@ -1,7 +1,7 @@
 discard """
 ccodecheck: "\\i !@('systemInit')"
 ccodecheck: "\\i !@('systemDatInit')"
-output: "hi 4778"
+output: "hello"
 """
 # bug  #2041: Macros need to be available for os:standalone!
 import macros

tests/manyloc/standalone/panicoverride.nim

@@ -5,7 +5,7 @@ proc exit(code: int) {.importc, header: "<stdlib.h>", cdecl.}
 {.push stack_trace: off, profiler:off.}
 
 proc rawoutput(s: string) =
-  printf("%s\n", s.cstring)
+  printf("%s\n", s)
 
 proc panic(s: string) {.noreturn.} =
   rawoutput(s)