gc:destructors progress

compiler/ccgexprs.nim

@@ -2028,7 +2028,7 @@ proc genMove(p: BProc; n: PNode; d: var TLoc) =
     resetLoc(p, a)
 
 proc genDestroy(p: BProc; n: PNode) =
-  if optNimV2 in p.config.globalOptions:
+  if p.config.selectedGC == gcDestructors:
     let arg = n[1].skipAddr
     let t = arg.typ.skipTypes(abstractInst)
     case t.kind

compiler/commands.nim

@@ -437,30 +437,31 @@ proc processSwitch*(switch, arg: string, pass: TCmdLinePass, info: TLineInfo;
     processOnOffSwitchG(conf, {optWholeProject}, arg, pass, info)
   of "gc":
     expectArg(conf, switch, arg, pass, info)
-    case arg.normalize
-    of "boehm":
-      conf.selectedGC = gcBoehm
-      defineSymbol(conf.symbols, "boehmgc")
-    of "refc":
-      conf.selectedGC = gcRefc
-    of "v2":
-      message(conf, info, warnDeprecated, "--gc:v2 is deprecated; using default gc")
-    of "markandsweep":
-      conf.selectedGC = gcMarkAndSweep
-      defineSymbol(conf.symbols, "gcmarkandsweep")
-    of "destructors":
-      conf.selectedGC = gcDestructors
-      defineSymbol(conf.symbols, "gcdestructors")
-    of "go":
-      conf.selectedGC = gcGo
-      defineSymbol(conf.symbols, "gogc")
-    of "none":
-      conf.selectedGC = gcNone
-      defineSymbol(conf.symbols, "nogc")
-    of "stack", "regions":
-      conf.selectedGC= gcRegions
-      defineSymbol(conf.symbols, "gcregions")
-    else: localError(conf, info, errNoneBoehmRefcExpectedButXFound % arg)
+    if pass in {passCmd2, passPP}:
+      case arg.normalize
+      of "boehm":
+        conf.selectedGC = gcBoehm
+        defineSymbol(conf.symbols, "boehmgc")
+      of "refc":
+        conf.selectedGC = gcRefc
+      of "v2":
+        message(conf, info, warnDeprecated, "--gc:v2 is deprecated; using default gc")
+      of "markandsweep":
+        conf.selectedGC = gcMarkAndSweep
+        defineSymbol(conf.symbols, "gcmarkandsweep")
+      of "destructors":
+        conf.selectedGC = gcDestructors
+        defineSymbol(conf.symbols, "gcdestructors")
+      of "go":
+        conf.selectedGC = gcGo
+        defineSymbol(conf.symbols, "gogc")
+      of "none":
+        conf.selectedGC = gcNone
+        defineSymbol(conf.symbols, "nogc")
+      of "stack", "regions":
+        conf.selectedGC= gcRegions
+        defineSymbol(conf.symbols, "gcregions")
+      else: localError(conf, info, errNoneBoehmRefcExpectedButXFound % arg)
   of "warnings", "w":
     if processOnOffSwitchOrList(conf, {optWarns}, arg, pass, info): listWarnings(conf)
   of "warning": processSpecificNote(arg, wWarning, pass, info, switch, conf)

compiler/liftdestructors.nim

@@ -129,7 +129,7 @@ proc newDeepCopyCall(op: PSym; x, y: PNode): PNode =
   result = newAsgnStmt(x, newOpCall(op, y))
 
 proc useNoGc(c: TLiftCtx; t: PType): bool {.inline.} =
-  result = optNimV2 in c.g.config.globalOptions and
+  result = c.g.config.selectedGC == gcDestructors and
     ({tfHasGCedMem, tfHasOwned} * t.flags != {} or t.isGCedMem)
 
 proc instantiateGeneric(c: var TLiftCtx; op: PSym; t, typeInst: PType): PSym =
@@ -563,7 +563,7 @@ proc produceSym(g: ModuleGraph; c: PContext; typ: PType; kind: TTypeAttachedOp;
   typ.attachedOps[kind] = result
 
   var tk: TTypeKind
-  if optNimV2 in g.config.globalOptions:
+  if g.config.selectedGC == gcDestructors:
     tk = skipTypes(typ, {tyOrdinal, tyRange, tyInferred, tyGenericInst, tyStatic, tyAlias, tySink}).kind
   else:
     tk = tyNone # no special casing for strings and seqs

compiler/semtypes.nim

@@ -1653,7 +1653,7 @@ proc semTypeNode(c: PContext, n: PNode, prev: PType): PType =
     of mSet: result = semSet(c, n, prev)
     of mOrdinal: result = semOrdinal(c, n, prev)
     of mSeq:
-      if c.config.selectedGC == gcDestructors and optNimV2 notin c.config.globalOptions:
+      if false: # c.config.selectedGC == gcDestructors and optNimV2 notin c.config.globalOptions:
         let s = c.graph.sysTypes[tySequence]
         assert s != nil
         assert prev == nil

lib/core/strs.nim

@@ -9,20 +9,6 @@
 
 ## Default new string implementation used by Nim's core.
 
-when false:
-  # these are to be implemented or changed in the code generator.
-
-  #proc rawNewStringNoInit(space: int): NimString {.compilerproc.}
-  # seems to be unused.
-  proc copyDeepString(src: NimString): NimString {.inline.}
-  # ----------------- sequences ----------------------------------------------
-
-  proc incrSeqV3(s: PGenericSeq, typ: PNimType): PGenericSeq {.compilerproc.}
-  proc setLengthSeqV2(s: PGenericSeq, typ: PNimType, newLen: int): PGenericSeq {.
-      compilerRtl.}
-  proc newSeq(typ: PNimType, len: int): pointer {.compilerRtl.}
-  proc newSeqRC1(typ: PNimType, len: int): pointer {.compilerRtl.}
-
 import allocators
 
 type
@@ -45,41 +31,6 @@ template frees(s) =
   if not isLiteral(s):
     s.p.allocator.dealloc(s.p.allocator, s.p, contentSize(s.p.cap))
 
-when not defined(nimV2):
-  proc `=destroy`(s: var string) =
-    var a = cast[ptr NimStringV2](addr s)
-    frees(a)
-    a.len = 0
-    a.p = nil
-
-  proc `=sink`(x: var string, y: string) =
-    var a = cast[ptr NimStringV2](addr x)
-    var b = cast[ptr NimStringV2](unsafeAddr y)
-    # we hope this is optimized away for not yet alive objects:
-    if unlikely(a.p == b.p): return
-    frees(a)
-    a.len = b.len
-    a.p = b.p
-
-  proc `=`(x: var string, y: string) =
-    var a = cast[ptr NimStringV2](addr x)
-    var b = cast[ptr NimStringV2](unsafeAddr y)
-    if unlikely(a.p == b.p): return
-    frees(a)
-    a.len = b.len
-    if isLiteral(b):
-      # we can shallow copy literals:
-      a.p = b.p
-    else:
-      let allocator = if a.p != nil and a.p.allocator != nil: a.p.allocator else: getLocalAllocator()
-      # we have to allocate the 'cap' here, consider
-      # 'let y = newStringOfCap(); var x = y'
-      # on the other hand... These get turned into moves now.
-      a.p = cast[ptr NimStrPayload](allocator.alloc(allocator, contentSize(b.len)))
-      a.p.allocator = allocator
-      a.p.cap = b.len
-      copyMem(unsafeAddr a.p.data[0], unsafeAddr b.p.data[0], b.len+1)
-
 proc resize(old: int): int {.inline.} =
   if old <= 0: result = 4
   elif old < 65536: result = old * 2

lib/system.nim

@@ -2093,7 +2093,7 @@ when not defined(JS) and not defined(nimscript) and hostOS != "standalone":
 when not defined(JS) and not defined(nimscript) and hasAlloc and not defined(gcDestructors):
   proc addChar(s: NimString, c: char): NimString {.compilerproc, benign.}
 
-when not defined(gcDestructors):
+when not defined(gcDestructors) or defined(nimscript):
   proc add*[T](x: var seq[T], y: T) {.magic: "AppendSeqElem", noSideEffect.}
     ## Generic proc for adding a data item `y` to a container `x`.
     ##

lib/system/gc_ms.nim

@@ -511,7 +511,7 @@ when not defined(useNimRtl):
       gch.tracing = true
 
   proc GC_fullCollect() =
-    var oldThreshold = gch.cycleThreshold
+    let oldThreshold = gch.cycleThreshold
     gch.cycleThreshold = 0 # forces cycle collection
     collectCT(gch, 0)
     gch.cycleThreshold = oldThreshold