VM produces objects.

compiler/semmacrosanity.nim

@@ -38,14 +38,16 @@ proc annotateType*(n: PNode, t: PType) =
   # Note: x can be unequal to t and we need to be careful to use 't'
   # to not to skip tyGenericInst
   case n.kind
+  of nkObjConstr:
+    n.typ = t
+    for i in 1 .. <n.len:
+      let field = x.n.ithField(i - 1)
+      if field.isNil: globalError n.info, "invalid field at index " & $i
+      else:
+        internalAssert(n.sons[i].kind == nkExprColonExpr)
+        annotateType(n.sons[i].sons[1], field.typ)
   of nkPar:
-    if x.kind == tyObject:
-      n.typ = t
-      for i in 0 .. <n.len:
-        let field = x.n.ithField(i)
-        if field.isNil: globalError n.info, "invalid field at index " & $i
-        else: annotateType(n.sons[i], field.typ)
-    elif x.kind == tyTuple:
+    if x.kind == tyTuple:
       n.typ = t
       for i in 0 .. <n.len:
         if i >= x.len: globalError n.info, "invalid field at index " & $i
@@ -53,7 +55,7 @@ proc annotateType*(n: PNode, t: PType) =
     elif x.kind == tyProc and x.callConv == ccClosure:
       n.typ = t
     else:
-      globalError(n.info, "() must have an object or tuple type")
+      globalError(n.info, "() must have a tuple type")
   of nkBracket:
     if x.kind in {tyArrayConstr, tyArray, tySequence, tyOpenArray}:
       n.typ = t

compiler/vm.nim

@@ -83,7 +83,7 @@ proc stackTrace(c: PCtx, tos: PStackFrame, pc: int,
 
 proc bailOut(c: PCtx; tos: PStackFrame) =
   stackTrace(c, tos, c.exceptionInstr, errUnhandledExceptionX,
-             c.currentExceptionA.sons[2].strVal)
+             c.currentExceptionA.sons[3].skipColon.strVal)
 
 when not defined(nimComputedGoto):
   {.pragma: computedGoto.}
@@ -383,7 +383,7 @@ proc rawExecute(c: PCtx, start: int, tos: PStackFrame): TFullReg =
     let instr = c.code[pc]
     let ra = instr.regA
     #if c.traceActive:
-    #  echo "PC ", pc, " ", c.code[pc].opcode, " ra ", ra
+    #echo "PC ", pc, " ", c.code[pc].opcode, " ra ", ra, " rb ", instr.regB, " rc ", instr.regC
     #  message(c.debug[pc], warnUser, "Trace")
 
     case instr.opcode
@@ -475,14 +475,19 @@ proc rawExecute(c: PCtx, start: int, tos: PStackFrame): TFullReg =
       decodeBC(rkNode)
       let src = regs[rb].node
       if src.kind notin {nkEmpty..nkNilLit}:
-        let n = src.sons[rc].skipColon
+        let n = src.sons[rc + ord(src.kind == nkObjConstr)].skipColon
         regs[ra].node = n
       else:
         stackTrace(c, tos, pc, errNilAccess)
     of opcWrObj:
       # a.b = c
       decodeBC(rkNode)
-      putIntoNode(regs[ra].node.sons[rb], regs[rc])
+      let shiftedRb = rb + ord(regs[ra].node.kind == nkObjConstr)
+      let dest = regs[ra].node
+      if dest.sons[shiftedRb].kind == nkExprColonExpr:
+        putIntoNode(dest.sons[shiftedRb].sons[1], regs[rc])
+      else:
+        putIntoNode(dest.sons[shiftedRb], regs[rc])
     of opcWrStrIdx:
       decodeBC(rkNode)
       let idx = regs[rb].intVal.int

compiler/vmgen.nim

@@ -1392,7 +1392,10 @@ proc getNullValueAux(obj: PNode, result: PNode) =
     for i in countup(1, sonsLen(obj) - 1):
       getNullValueAux(lastSon(obj.sons[i]), result)
   of nkSym:
-    addSon(result, getNullValue(obj.sym.typ, result.info))
+    let field = newNodeI(nkExprColonExpr, result.info)
+    field.add(obj)
+    field.add(getNullValue(obj.sym.typ, result.info))
+    addSon(result, field)
   else: globalError(result.info, "cannot create null element for: " & $obj)
 
 proc getNullValue(typ: PType, info: TLineInfo): PNode =
@@ -1418,7 +1421,8 @@ proc getNullValue(typ: PType, info: TLineInfo): PNode =
       result.add(newNodeIT(nkNilLit, info, t))
       result.add(newNodeIT(nkNilLit, info, t))
   of tyObject:
-    result = newNodeIT(nkPar, info, t)
+    result = newNodeIT(nkObjConstr, info, t)
+    result.add(newNodeIT(nkEmpty, info, t))
     getNullValueAux(t.n, result)
     # initialize inherited fields:
     var base = t.sons[0]

compiler/vmmarshal.nim

@@ -36,8 +36,8 @@ proc getField(n: PNode; position: int): PSym =
 proc storeAny(s: var string; t: PType; a: PNode; stored: var IntSet)
 
 proc storeObj(s: var string; typ: PType; x: PNode; stored: var IntSet) =
-  internalAssert x.kind in {nkObjConstr, nkPar}
-  let start = ord(x.kind == nkObjConstr)
+  internalAssert x.kind == nkObjConstr
+  let start = 1
   for i in countup(start, sonsLen(x) - 1):
     if i > start: s.add(", ")
     var it = x.sons[i]
@@ -205,18 +205,23 @@ proc loadAny(p: var JsonParser, t: PType,
   of tyObject:
     if p.kind != jsonObjectStart: raiseParseErr(p, "'{' expected for an object")
     next(p)
-    result = newNode(nkPar)
-    result.sons = @[]
+    result = newNode(nkObjConstr)
+    result.sons = @[newNode(nkEmpty)]
     while p.kind != jsonObjectEnd and p.kind != jsonEof:
       if p.kind != jsonString:
         raiseParseErr(p, "string expected for a field name")
-      let field = lookupInRecord(t.n, getIdent(p.str))
+      let ident = getIdent(p.str)
+      let field = lookupInRecord(t.n, ident)
       if field.isNil:
         raiseParseErr(p, "unknown field for object of type " & typeToString(t))
       next(p)
-      if field.position >= result.sons.len:
-        setLen(result.sons, field.position+1)
-      result.sons[field.position] = loadAny(p, field.typ, tab)
+      let pos = field.position + 1
+      if pos >= result.sons.len:
+        setLen(result.sons, pos + 1)
+      let fieldNode = newNode(nkExprColonExpr)
+      fieldNode.addSon(newSymNode(newSym(skField, ident, nil, unknownLineInfo())))
+      fieldNode.addSon(loadAny(p, field.typ, tab))
+      result.sons[pos] = fieldNode
     if p.kind == jsonObjectEnd: next(p)
     else: raiseParseErr(p, "'}' end of object expected")
   of tySet:

compiler/vmops.nim

@@ -46,7 +46,7 @@ template wrap2svoid(op) {.immediate, dirty.} =
 
 proc getCurrentExceptionMsgWrapper(a: VmArgs) {.nimcall.} =
   setResult(a, if a.currentException.isNil: ""
-               else: a.currentException.sons[2].strVal)
+               else: a.currentException.sons[3].skipColon.strVal)
 
 proc registerAdditionalOps*(c: PCtx) =
   wrap1f(sqrt)

web/news.txt

@@ -62,6 +62,10 @@ News
     * ``libeay32.dll``: Split into ``libeay32.dll`` and ``libeay64.dll``.
 
     Compile with ``-d:nimOldDLLs`` to make the stdlib use the old DLL names.
+  - Nim VM now treats objects as nkObjConstr nodes, and not nkPar nodes as it
+    was previously. Macros that generate nkPar nodes when object is expected are
+    likely to break. Macros that expect nkPar nodes to which objects are passed
+    are likely to break as well.
 
 
   Library additions