fixes a long-standing bug about procvar checking

compiler/ast.nim

@@ -764,7 +764,7 @@ const
   dispatcherPos* = 8 # caution: if method has no 'result' it can be position 5!
 
   nkCallKinds* = {nkCall, nkInfix, nkPrefix, nkPostfix,
-                  nkCommand, nkCallStrLit}
+                  nkCommand, nkCallStrLit, nkHiddenCallConv}
 
   nkLambdaKinds* = {nkLambda, nkDo}
   nkSymChoices* = {nkClosedSymChoice, nkOpenSymChoice}

compiler/sem.nim

@@ -201,7 +201,7 @@ proc myOpen(module: PSym): PPassContext =
   if c.p != nil: InternalError(module.info, "sem.myOpen")
   c.semConstExpr = semConstExpr
   c.semExpr = semExpr
-  c.semExprWithType = semExprWithType
+  c.semOperand = semOperand
   c.semConstBoolExpr = semConstBoolExpr
   c.semOverloadedCall = semOverloadedCall
   c.semTypeNode = semTypeNode

compiler/semdata.nim

@@ -69,7 +69,7 @@ type
     libs*: TLinkedList         # all libs used by this module
     semConstExpr*: proc (c: PContext, n: PNode): PNode {.nimcall.} # for the pragmas
     semExpr*: proc (c: PContext, n: PNode, flags: TExprFlags = {}): PNode {.nimcall.}
-    semExprWithType*: proc (c: PContext, n: PNode, flags: TExprFlags = {}): PNode {.nimcall.}
+    semOperand*: proc (c: PContext, n: PNode, flags: TExprFlags = {}): PNode {.nimcall.}
     semConstBoolExpr*: proc (c: PContext, n: PNode): PNode {.nimcall.} # XXX bite the bullet
     semOverloadedCall*: proc (c: PContext, n, nOrig: PNode,
                               filter: TSymKinds): PNode {.nimcall.}

compiler/semexprs.nim

@@ -19,6 +19,33 @@ proc semTemplateExpr(c: PContext, n: PNode, s: PSym, semCheck = true): PNode =
 
 proc semFieldAccess(c: PContext, n: PNode, flags: TExprFlags = {}): PNode
 
+proc performProcvarCheck(c: PContext, n: PNode, s: PSym) =
+  var smoduleId = getModule(s).id
+  if sfProcVar notin s.flags and s.typ.callConv == ccDefault and
+      smoduleId != c.module.id and smoduleId != c.friendModule.id: 
+    LocalError(n.info, errXCannotBePassedToProcVar, s.name.s)
+
+proc semProcvarCheck(c: PContext, n: PNode) =
+  let n = n.skipConv
+  if n.kind == nkSym and n.sym.kind in {skProc, skMethod, skIterator,
+                                        skConverter}:
+    performProcvarCheck(c, n, n.sym)
+
+proc semOperand(c: PContext, n: PNode, flags: TExprFlags = {}): PNode =
+  # same as 'semExprWithType' but doesn't check for proc vars
+  result = semExpr(c, n, flags)
+  if result.kind == nkEmpty: 
+    # do not produce another redundant error message:
+    #raiseRecoverableError("")
+    result = errorNode(c, n)
+  if result.typ != nil:
+    # XXX tyGenericInst here?
+    if result.typ.kind == tyVar: result = newDeref(result)
+  else:
+    LocalError(n.info, errExprXHasNoType, 
+               renderTree(result, {renderNoComments}))
+    result.typ = errorType(c)
+
 proc semExprWithType(c: PContext, n: PNode, flags: TExprFlags = {}): PNode =
   result = semExpr(c, n, flags)
   if result.kind == nkEmpty: 
@@ -27,6 +54,7 @@ proc semExprWithType(c: PContext, n: PNode, flags: TExprFlags = {}): PNode =
     result = errorNode(c, n)
   if result.typ != nil:
     # XXX tyGenericInst here?
+    semProcvarCheck(c, result)
     if result.typ.kind == tyVar: result = newDeref(result)
   else:
     LocalError(n.info, errExprXHasNoType, 
@@ -42,6 +70,8 @@ proc semExprNoDeref(c: PContext, n: PNode, flags: TExprFlags = {}): PNode =
     LocalError(n.info, errExprXHasNoType, 
                renderTree(result, {renderNoComments}))
     result.typ = errorType(c)
+  else:
+    semProcvarCheck(c, result)
 
 proc semSymGenericInstantiation(c: PContext, n: PNode, s: PSym): PNode =
   result = symChoice(c, n, s, scClosed)
@@ -51,15 +81,6 @@ proc inlineConst(n: PNode, s: PSym): PNode {.inline.} =
   result.typ = s.typ
   result.info = n.info
   
-proc performProcvarCheck(c: PContext, n: PNode, s: PSym) =
-  # XXX this not correct; it's valid to pass to templates and macros.
-  # We really need another post nkCallConv check for this. Or maybe do it
-  # in transform().
-  var smoduleId = getModule(s).id
-  if sfProcVar notin s.flags and s.typ.callConv == ccDefault and
-      smoduleId != c.module.id and smoduleId != c.friendModule.id: 
-    LocalError(n.info, errXCannotBePassedToProcVar, s.name.s)
-  
 proc semSym(c: PContext, n: PNode, s: PSym, flags: TExprFlags): PNode = 
   case s.kind
   of skConst:
@@ -512,6 +533,7 @@ proc analyseIfAddressTakenInCall(c: PContext, n: PNode) =
             LocalError(n.sons[i].info, errVarForOutParamNeeded)
     return
   for i in countup(1, sonsLen(n) - 1):
+    semProcvarCheck(c, n.sons[i])
     if i < sonsLen(t) and
         skipTypes(t.sons[i], abstractInst-{tyTypeDesc}).kind == tyVar:
       if n.sons[i].kind != nkHiddenAddr:
@@ -1728,7 +1750,7 @@ proc semExpr(c: PContext, n: PNode, flags: TExprFlags = {}): PNode =
     semCaptureSym(s, c.p.owner)
     result = semSym(c, n, s, flags)
     if s.kind in {skProc, skMethod, skIterator, skConverter}:
-      performProcvarCheck(c, n, s)
+      #performProcvarCheck(c, n, s)
       result = symChoice(c, n, s, scClosed)
       if result.kind == nkSym:
         markIndirect(c, result.sym)

compiler/sempass2.nim

@@ -14,9 +14,7 @@ import
 # Second semantic checking pass over the AST. Necessary because the old
 # way had some inherent problems. Performs:
 # 
-# * procvar checks
 # * effect+exception tracking
-# * closure analysis
 # * checks for invalid usages of compiletime magics (not implemented)
 # * checks for invalid usages of PNimNode (not implemented)
 # * later: will do an escape analysis for closures at least

compiler/sigmatch.nim

@@ -177,12 +177,12 @@ proc NotFoundError*(c: PContext, n: PNode) =
       add(result, renderTree(n.sons[i].sons[0]))
       add(result, ": ")
       if nt.isNil:
-        n.sons[i].sons[1] = c.semExprWithType(c, n.sons[i].sons[1])
+        n.sons[i].sons[1] = c.semOperand(c, n.sons[i].sons[1])
         nt = n.sons[i].sons[1].typ
         n.sons[i].typ = nt
     else:
       if nt.isNil:
-        n.sons[i] = c.semExprWithType(c, n.sons[i])
+        n.sons[i] = c.semOperand(c, n.sons[i])
         nt = n.sons[i].typ
     if nt.kind == tyError: return
     add(result, typeToString(nt))
@@ -812,13 +812,13 @@ proc prepareOperand(c: PContext; formal: PType; a: PNode): PNode =
     # a.typ == nil is valid
     result = a
   elif a.typ.isNil:
-    result = c.semExprWithType(c, a, {efDetermineType})
+    result = c.semOperand(c, a, {efDetermineType})
   else:
     result = a
 
 proc prepareOperand(c: PContext; a: PNode): PNode =
   if a.typ.isNil:
-    result = c.semExprWithType(c, a, {efDetermineType})
+    result = c.semOperand(c, a, {efDetermineType})
   else:
     result = a
 

tests/reject/mopaque.nim

@@ -3,3 +3,5 @@ type
     line*: int
     filename*: string
     buffer: cstring
+
+proc noProcVar*(): int = 18

todo.txt

@@ -13,6 +13,7 @@ version 0.9.2
 - acyclic vs prunable; introduce GC hints
 - CGEN: ``restrict`` pragma + backend support; computed goto support
 - document NimMain and check whether it works for threading
+- a project wide override option for 'dynlib'
 
 
 Bugs