Use typeflag instead

compiler/ast.nim

@@ -17,8 +17,7 @@ export int128
 
 type
   TCallingConvention* = enum
-    ccImplicit,               # proc has no explicit calling convention
+    ccNimCall,                # nimcall, also the default
-    ccNimCall,                # proc was explicitly marked as nimcall
     ccStdCall,                # procedure is stdcall
     ccCDecl,                  # cdecl
     ccSafeCall,               # safecall
@@ -31,12 +30,10 @@ type
     ccNoConvention            # needed for generating proper C procs sometimes
 
 const
-  ccDefault* = {ccImplicit, ccNimCall}
+  CallingConvToStr*: array[TCallingConvention, string] = ["nimcall", "stdcall",
-  CallingConvToStr*: array[TCallingConvention, string] = ["", "nimcall", "stdcall",
     "cdecl", "safecall", "syscall", "inline", "noinline", "fastcall", "thiscall",
     "closure", "noconv"]
 
-
 type
   TNodeKind* = enum # order is extremely important, because ranges are used
                     # to check whether a node belongs to a certain class
@@ -563,6 +560,7 @@ type
     tfCompleteStruct
       # (for importc types); type is fully specified, allowing to compute
       # sizeof, alignof, offsetof at CT
+    tfExplicitCallConv
 
   TTypeFlags* = set[TTypeFlag]
 

compiler/ccgexprs.nim

@@ -1240,7 +1240,7 @@ proc rawGenNew(p: BProc, a: var TLoc, sizeExpr: Rope; needsInit: bool) =
       # the prototype of a destructor is ``=destroy(x: var T)`` and that of a
       # finalizer is: ``proc (x: ref T) {.nimcall.}``. We need to check the calling
       # convention at least:
-      if bt.destructor.typ == nil or bt.destructor.typ.callConv notin ccDefault:
+      if bt.destructor.typ == nil or bt.destructor.typ.callConv != ccNimCall:
         localError(p.module.config, a.lode.info,
           "the destructor that is turned into a finalizer needs " &
           "to have the 'nimcall' calling convention")

compiler/ccgtypes.nim

@@ -234,7 +234,7 @@ proc isInvalidReturnType(conf: ConfigRef; rettype: PType): bool =
     else: result = false
 
 const
-  CallingConvToStr: array[TCallingConvention, string] = ["N_NIMCALL", "N_NIMCALL",
+  CallingConvToStr: array[TCallingConvention, string] = ["N_NIMCALL",
     "N_STDCALL", "N_CDECL", "N_SAFECALL",
     "N_SYSCALL", # this is probably not correct for all platforms,
                  # but one can #define it to what one wants
@@ -1297,7 +1297,7 @@ proc genHook(m: BModule; t: PType; info: TLineInfo; op: TTypeAttachedOp): Rope =
     # the prototype of a destructor is ``=destroy(x: var T)`` and that of a
     # finalizer is: ``proc (x: ref T) {.nimcall.}``. We need to check the calling
     # convention at least:
-    if theProc.typ == nil or theProc.typ.callConv notin ccDefault:
+    if theProc.typ == nil or theProc.typ.callConv != ccNimCall:
       localError(m.config, info,
         theProc.name.s & " needs to have the 'nimcall' calling convention")
 

compiler/evalffi.nim

@@ -104,7 +104,7 @@ proc mapType(conf: ConfigRef, t: ast.PType): ptr libffi.Type =
 
 proc mapCallConv(conf: ConfigRef, cc: TCallingConvention, info: TLineInfo): TABI =
   case cc
-  of ccDefault: result = DEFAULT_ABI
+  of ccNimCall: result = DEFAULT_ABI
   of ccStdCall: result = when defined(windows) and defined(x86): STDCALL else: DEFAULT_ABI
   of ccCDecl: result = DEFAULT_ABI
   else:

compiler/lambdalifting.nim

@@ -293,7 +293,7 @@ proc markAsClosure(g: ModuleGraph; owner: PSym; n: PNode) =
       ("'$1' is of type <$2> which cannot be captured as it would violate memory" &
        " safety, declared here: $3; using '-d:nimWorkaround14447' helps in some cases") %
       [s.name.s, typeToString(s.typ), g.config$s.info])
-  elif owner.typ.callConv notin {ccClosure, ccImplicit}:
+  elif not (owner.typ.callConv == ccClosure or owner.typ.callConv == ccNimCall and tfExplicitCallConv notin owner.typ.flags):
     localError(g.config, n.info, "illegal capture '$1' because '$2' has the calling convention: <$3>" %
       [s.name.s, owner.name.s, CallingConvToStr[owner.typ.callConv]])
   incl(owner.typ.flags, tfCapturesEnv)
@@ -822,7 +822,8 @@ proc semCaptureSym*(s, owner: PSym) =
       var o = owner.skipGenericOwner
       while o != nil and o.kind != skModule:
         if s.owner == o:
-          if owner.typ.callConv in {ccClosure, ccImplicit} or owner.kind == skIterator:
+          if owner.typ.callConv == ccClosure or owner.kind == skIterator or
+             owner.typ.callConv == ccNimCall and tfExplicitCallConv notin owner.typ.flags:
             owner.typ.callConv = ccClosure
             propagateClosure(owner.skipGenericOwner, s.owner)
           else:

compiler/pragmas.nim

@@ -326,7 +326,7 @@ proc processDynLib(c: PContext, n: PNode, sym: PSym) =
     # a calling convention that doesn't introduce custom name mangling
     # cdecl is the default - the user can override this explicitly
     if sym.kind in routineKinds and sym.typ != nil and
-        sym.typ.callConv == ccImplicit:
+       tfExplicitCallConv notin sym.typ.flags:
       sym.typ.callConv = ccCDecl
 
 proc processNote(c: PContext, n: PNode) =
@@ -1061,7 +1061,9 @@ proc singlePragma(c: PContext, sym: PSym, n: PNode, i: var int,
       of FirstCallConv..LastCallConv:
         assert(sym != nil)
         if sym.typ == nil: invalidPragma(c, it)
-        else: sym.typ.callConv = wordToCallConv(k)
+        else:
+          sym.typ.callConv = wordToCallConv(k)
+          sym.typ.flags.incl tfExplicitCallConv
       of wEmit: pragmaEmit(c, it)
       of wUnroll: pragmaUnroll(c, it)
       of wLinearScanEnd, wComputedGoto: noVal(c, it)

compiler/semdata.nim

@@ -212,7 +212,7 @@ proc considerGenSyms*(c: PContext; n: PNode) =
 proc newOptionEntry*(conf: ConfigRef): POptionEntry =
   new(result)
   result.options = conf.options
-  result.defaultCC = ccImplicit
+  result.defaultCC = ccNimCall
   result.dynlib = nil
   result.notes = conf.notes
   result.warningAsErrors = conf.warningAsErrors

compiler/sigmatch.nim

@@ -639,11 +639,11 @@ proc procTypeRel(c: var TCandidate, f, a: PType): TTypeRelation =
       return isNone
     elif f.callConv != a.callConv:
       # valid to pass a 'nimcall' thingie to 'closure':
-      if f.callConv == ccClosure and a.callConv in ccDefault:
+      if f.callConv == ccClosure and a.callConv == ccNimCall:
         result = if result == isInferred: isInferredConvertible
                  elif result == isBothMetaConvertible: isBothMetaConvertible
                  else: isConvertible
-      elif not(f.callConv in ccDefault and a.callConv in ccDefault):
+      else:
         return isNone
     when useEffectSystem:
       if compatibleEffects(f, a) != efCompat: return isNone

compiler/transf.nim

@@ -539,7 +539,7 @@ proc transformConv(c: PTransf, n: PNode): PNode =
     # happens sometimes for generated assignments, etc.
   of tyProc:
     result = transformSons(c, n)
-    if dest.callConv == ccClosure and source.callConv in ccDefault:
+    if dest.callConv == ccClosure and source.callConv == ccNimCall:
       result = generateThunk(c, result[1], dest)
   else:
     result = transformSons(c, n)

compiler/types.nim

@@ -679,7 +679,7 @@ proc typeToString(typ: PType, prefer: TPreferedDesc = preferName): string =
         if i < t.len - 1: result.add(", ")
       result.add(')')
       if t.len > 0 and t[0] != nil: result.add(": " & typeToString(t[0]))
-      var prag = if t.callConv == ccImplicit: "" else: CallingConvToStr[t.callConv]
+      var prag = if t.callConv == ccNimCall and tfExplicitCallConv notin t.flags: "" else: CallingConvToStr[t.callConv]
       if tfNoSideEffect in t.flags:
         addSep(prag)
         prag.add("noSideEffect")

tests/closure/tinvalidclosure5.nim

@@ -0,0 +1,10 @@
+discard """
+  errormsg: "type mismatch: got <proc (){.closure, gcsafe, locks: 0.}> but expected 'A = proc (){.nimcall.}'"
+  line: 9
+"""
+
+type A = proc() {.nimcall.}
+proc main =
+  let b = 1
+  let a: A = proc() = echo b
+