compilation cache: small fixes; methods still not working

compiler/cgen.nim

@@ -936,6 +936,11 @@ proc writeModule(m: BModule, pending: bool) =
     var code = genModule(m, cfilenoext)
     writeRope(code, cfile)
     addFileToCompile(cfilenoext)
+  elif not ExistsFile(toObjFile(cfilenoext)):
+    # Consider: first compilation compiles ``system.nim`` and produces
+    # ``system.c`` but then compilation fails due to an error. This means
+    # that ``system.o`` is missing, so we need to call the C compiler for it:
+    addFileToCompile(cfilenoext)
   addFileToLink(cfilenoext)
 
 proc myClose(b: PPassContext, n: PNode): PNode = 
@@ -953,7 +958,7 @@ proc myClose(b: PPassContext, n: PNode): PNode =
     finishModule(m)
   if sfMainModule in m.module.flags: 
     var disp = generateMethodDispatchers()
-    for i in 0..sonsLen(disp)-1: genProcAux(gNimDat, disp.sons[i].sym)
+    for i in 0..sonsLen(disp)-1: genProcAux(m, disp.sons[i].sym)
     genMainProc(m) 
     # we need to process the transitive closure because recursive module
     # deps are allowed (and the system module is processed in the wrong

compiler/cgmeth.nim

@@ -38,8 +38,9 @@ proc methodCall*(n: PNode): PNode =
   result.sons[0].sym = disp
   for i in countup(1, sonsLen(result) - 1): 
     result.sons[i] = genConv(result.sons[i], disp.typ.sons[i], true)
-  
-var gMethods: seq[TSymSeq]
+
+# save for incremental compilation:
+var gMethods: seq[TSymSeq] = @[]
 
 proc sameMethodBucket(a, b: PSym): bool = 
   result = false
@@ -66,22 +67,24 @@ proc sameMethodBucket(a, b: PSym): bool =
       return 
   result = true
 
-proc methodDef*(s: PSym) =
+proc methodDef*(s: PSym, fromCache: bool) =
   var L = len(gMethods)
   for i in countup(0, L - 1): 
     if sameMethodBucket(gMethods[i][0], s): 
       add(gMethods[i], s)     # store a symbol to the dispatcher:
       addSon(s.ast, lastSon(gMethods[i][0].ast))
       return 
-  add(gMethods, @[s])        # create a new dispatcher:
-  var disp = copySym(s)
-  disp.typ = copyType(disp.typ, disp.typ.owner, false)
-  if disp.typ.callConv == ccInline: disp.typ.callConv = ccDefault
-  disp.ast = copyTree(s.ast)
-  disp.ast.sons[codePos] = ast.emptyNode
-  if s.typ.sons[0] != nil: 
-    disp.ast.sons[resultPos].sym = copySym(s.ast.sons[resultPos].sym)
-  addSon(s.ast, newSymNode(disp))
+  add(gMethods, @[s])
+  # create a new dispatcher:
+  if not fromCache:
+    var disp = copySym(s)
+    disp.typ = copyType(disp.typ, disp.typ.owner, false)
+    if disp.typ.callConv == ccInline: disp.typ.callConv = ccDefault
+    disp.ast = copyTree(s.ast)
+    disp.ast.sons[codePos] = ast.emptyNode
+    if s.typ.sons[0] != nil: 
+      disp.ast.sons[resultPos].sym = copySym(s.ast.sons[resultPos].sym)
+    addSon(s.ast, newSymNode(disp))
 
 proc relevantCol(methods: TSymSeq, col: int): bool = 
   # returns true iff the position is relevant
@@ -177,4 +180,3 @@ proc generateMethodDispatchers*(): PNode =
     sortBucket(gMethods[bucket], relevantCols)
     addSon(result, newSymNode(genDispatcher(gMethods[bucket], relevantCols)))
 
-gMethods = @[]

compiler/rodwrite.nim

@@ -338,7 +338,7 @@ proc symStack(w: PRodWriter) =
         #intSetIncl(debugWritten, s.id)
         encodeSym(w, s, w.data)
         add(w.data, rodNL)
-        if sfExported in s.flags: 
+        if sfExported in s.flags and s.kind in ExportableSymKinds: 
           encodeStr(s.name.s, w.interf)
           add(w.interf, ' ')
           encodeVInt(s.id, w.interf)
@@ -386,7 +386,8 @@ proc rawAddInterfaceSym(w: PRodWriter, s: PSym) =
 
 proc addInterfaceSym(w: PRodWriter, s: PSym) = 
   if w == nil: return 
-  if {sfExported, sfCompilerProc} * s.flags != {}: 
+  if s.kind in ExportableSymKinds and 
+      {sfExported, sfCompilerProc} * s.flags != {}: 
     rawAddInterfaceSym(w, s)
 
 proc addStmt(w: PRodWriter, n: PNode) = 

compiler/transf.nim

@@ -676,7 +676,7 @@ proc transform(c: PTransf, n: PNode): PTransNode =
   of nkProcDef, nkMethodDef, nkIteratorDef, nkMacroDef, nkConverterDef: 
     if n.sons[genericParamsPos].kind == nkEmpty: 
       n.sons[codePos] = PNode(transform(c, n.sons[codePos]))
-      if n.kind == nkMethodDef: methodDef(n.sons[namePos].sym)
+      if n.kind == nkMethodDef: methodDef(n.sons[namePos].sym, false)
     result = PTransNode(n)
   of nkContinueStmt:
     result = PTransNode(newNode(nkBreakStmt))
@@ -742,7 +742,7 @@ proc openTransf(module: PSym, filename: string): PPassContext =
 proc openTransfCached(module: PSym, filename: string, 
                       rd: PRodReader): PPassContext = 
   result = openTransf(module, filename)
-  for m in items(rd.methods): methodDef(m)
+  for m in items(rd.methods): methodDef(m, true)
 
 proc transfPass(): TPass = 
   initPass(result)