refactoring: flags instead of bools

compiler/ccgexprs.nim

@@ -1235,7 +1235,7 @@ proc genOfHelper(p: BProc; dest: PType; a: Rope): Rope =
   # unfortunately 'genTypeInfo' sets tfObjHasKids as a side effect, so we
   # have to call it here first:
   let ti = genTypeInfo(p.module, dest)
-  if tfFinal in dest.flags or (p.module.objHasKidsValid and
+  if tfFinal in dest.flags or (objHasKidsValid in p.module.flags and
                                tfObjHasKids notin dest.flags):
     result = "$1.m_type == $2" % [a, ti]
   else:

compiler/ccgmerge.nim

@@ -107,8 +107,8 @@ proc genMergeInfo*(m: BModule): Rope =
   writeIntSet(m.typeInfoMarker, s)
   s.add("labels:")
   encodeVInt(m.labels, s)
-  s.add(" hasframe:")
-  encodeVInt(ord(m.frameDeclared), s)
+  s.add(" flags:")
+  encodeVInt(cast[int](m.flags), s)
   s.add(tnl)
   s.add("*/")
   result = s.rope
@@ -222,7 +222,8 @@ proc processMergeInfo(L: var TBaseLexer, m: BModule) =
     of "declared":  readIntSet(L, m.declaredThings)
     of "typeInfo":  readIntSet(L, m.typeInfoMarker)
     of "labels":    m.labels = decodeVInt(L.buf, L.bufpos)
-    of "hasframe":  m.frameDeclared = decodeVInt(L.buf, L.bufpos) != 0
+    of "flags":
+      m.flags = cast[set[CodegenFlag]](decodeVInt(L.buf, L.bufpos) != 0)
     else: internalError("ccgmerge: unknown key: " & k)
 
 when not defined(nimhygiene):

compiler/ccgthreadvars.nim

@@ -18,7 +18,7 @@ proc emulatedThreadVars(): bool =
 proc accessThreadLocalVar(p: BProc, s: PSym) =
   if emulatedThreadVars() and not p.threadVarAccessed:
     p.threadVarAccessed = true
-    p.module.usesThreadVars = true
+    incl p.module.flags, usesThreadVars
     addf(p.procSec(cpsLocals), "\tNimThreadVars* NimTV;$n", [])
     add(p.procSec(cpsInit),
       ropecg(p.module, "\tNimTV = (NimThreadVars*) #GetThreadLocalVars();$n"))
@@ -51,7 +51,7 @@ proc declareThreadVar(m: BModule, s: PSym, isExtern: bool) =
     addf(m.s[cfsVars], " $1;$n", [s.loc.r])
 
 proc generateThreadLocalStorage(m: BModule) =
-  if nimtv != nil and (m.usesThreadVars or sfMainModule in m.module.flags):
+  if nimtv != nil and (usesThreadVars in m.flags or sfMainModule in m.module.flags):
     for t in items(nimtvDeps): discard getTypeDesc(m, t)
     addf(m.s[cfsSeqTypes], "typedef struct {$1} NimThreadVars;$n", [nimtv])
 

compiler/ccgtypes.nim

@@ -752,7 +752,7 @@ proc genProcHeader(m: BModule, prc: PSym): Rope =
   genCLineDir(result, prc.info)
   # using static is needed for inline procs
   if lfExportLib in prc.loc.flags:
-    if m.isHeaderFile:
+    if isHeaderFile in m.flags:
       result.add "N_LIB_IMPORT "
     else:
       result.add "N_LIB_EXPORT "

compiler/cgen.nim

@@ -64,8 +64,8 @@ proc isSimpleConst(typ: PType): bool =
       (t.kind == tyProc and t.callConv == ccClosure)
 
 proc useStringh(m: BModule) =
-  if not m.includesStringh:
-    m.includesStringh = true
+  if includesStringh notin m.flags:
+    incl m.flags, includesStringh
     discard lists.includeStr(m.headerFiles, "<string.h>")
 
 proc useHeader(m: BModule, sym: PSym) =
@@ -1011,11 +1011,11 @@ proc genInitCode(m: BModule) =
   add(prc, m.postInitProc.s(cpsLocals))
   add(prc, genSectionEnd(cpsLocals))
 
-  if optStackTrace in m.initProc.options and not m.frameDeclared:
+  if optStackTrace in m.initProc.options and frameDeclared notin m.flags:
     # BUT: the generated init code might depend on a current frame, so
     # declare it nevertheless:
-    m.frameDeclared = true
-    if not m.preventStackTrace:
+    incl m.flags, frameDeclared
+    if preventStackTrace notin m.flags:
       var procname = makeCString(m.module.name.s)
       add(prc, initFrame(m.initProc, procname, m.module.info.quotedFilename))
     else:
@@ -1032,7 +1032,7 @@ proc genInitCode(m: BModule) =
   add(prc, m.initProc.s(cpsStmts))
   add(prc, m.postInitProc.s(cpsStmts))
   add(prc, genSectionEnd(cpsStmts))
-  if optStackTrace in m.initProc.options and not m.preventStackTrace:
+  if optStackTrace in m.initProc.options and preventStackTrace notin m.flags:
     add(prc, deinitFrame(m.initProc))
   add(prc, deinitGCFrame(m.initProc))
   addf(prc, "}$N$N", [])
@@ -1105,7 +1105,7 @@ proc rawNewModule(module: PSym, filename: string): BModule =
   # no line tracing for the init sections of the system module so that we
   # don't generate a TFrame which can confuse the stack botton initialization:
   if sfSystemModule in module.flags:
-    result.preventStackTrace = true
+    incl result.flags, preventStackTrace
     excl(result.preInitProc.options, optStackTrace)
     excl(result.postInitProc.options, optStackTrace)
 
@@ -1128,9 +1128,11 @@ proc resetModule*(m: BModule) =
   m.forwardedProcs = @[]
   m.typeNodesName = getTempName()
   m.nimTypesName = getTempName()
-  m.preventStackTrace = sfSystemModule in m.module.flags
+  if sfSystemModule in m.module.flags:
+    incl m.flags, preventStackTrace
+  else:
+    excl m.flags, preventStackTrace
   nullify m.s
-  m.usesThreadVars = false
   m.typeNodes = 0
   m.nimTypes = 0
   nullify m.extensionLoaders
@@ -1175,7 +1177,7 @@ proc myOpen(module: PSym): PPassContext =
     let f = if headerFile.len > 0: headerFile else: gProjectFull
     generatedHeader = rawNewModule(module,
       changeFileExt(completeCFilePath(f), hExt))
-    generatedHeader.isHeaderFile = true
+    incl generatedHeader.flags, isHeaderFile
 
 proc writeHeader(m: BModule) =
   var result = getCopyright(m.filename)
@@ -1307,7 +1309,7 @@ proc myClose(b: PPassContext, n: PNode): PNode =
   registerModuleToMain(m.module)
 
   if sfMainModule in m.module.flags:
-    m.objHasKidsValid = true
+    incl m.flags, objHasKidsValid
     var disp = generateMethodDispatchers()
     for i in 0..sonsLen(disp)-1: genProcAux(m, disp.sons[i].sym)
     genMainProc(m)

compiler/cgendata.nim

@@ -92,17 +92,20 @@ type
     gcFrameType*: Rope       # the struct {} we put the GC markers into
 
   TTypeSeq* = seq[PType]
+
+  Codegenflag* = enum
+    preventStackTrace,  # true if stack traces need to be prevented
+    usesThreadVars,     # true if the module uses a thread var
+    frameDeclared,      # hack for ROD support so that we don't declare
+                        # a frame var twice in an init proc
+    isHeaderFile,       # C source file is the header file
+    includesStringh,    # C source file already includes ``<string.h>``
+    objHasKidsValid     # whether we can rely on tfObjHasKids
   TCGen = object of TPassContext # represents a C source file
     module*: PSym
     filename*: string
     s*: TCFileSections        # sections of the C file
-    preventStackTrace*: bool  # true if stack traces need to be prevented
-    usesThreadVars*: bool     # true if the module uses a thread var
-    frameDeclared*: bool      # hack for ROD support so that we don't declare
-                              # a frame var twice in an init proc
-    isHeaderFile*: bool       # C source file is the header file
-    includesStringh*: bool    # C source file already includes ``<string.h>``
-    objHasKidsValid*: bool    # whether we can rely on tfObjHasKids
+    flags*: set[Codegenflag]
     cfilename*: string        # filename of the module (including path,
                               # without extension)
     typeCache*: TIdTable      # cache the generated types