big repo cleanup

compiler/seminst.nim

@@ -0,0 +1,128 @@
+#
+#
+#           The Nimrod Compiler
+#        (c) Copyright 2011 Andreas Rumpf
+#
+#    See the file "copying.txt", included in this
+#    distribution, for details about the copyright.
+#
+
+# This module implements the instantiation of generic procs.
+
+proc instantiateGenericParamList(c: PContext, n: PNode, pt: TIdTable) = 
+  if (n.kind != nkGenericParams): 
+    InternalError(n.info, "instantiateGenericParamList; no generic params")
+  for i in countup(0, sonsLen(n) - 1): 
+    var a = n.sons[i]
+    if a.kind != nkSym: 
+      InternalError(a.info, "instantiateGenericParamList; no symbol")
+    var q = a.sym
+    if not (q.typ.kind in {tyTypeDesc, tyGenericParam}): continue 
+    var s = newSym(skType, q.name, getCurrOwner())
+    var t = PType(IdTableGet(pt, q.typ))
+    if t == nil: 
+      LocalError(a.info, errCannotInstantiateX, s.name.s)
+      break
+    if (t.kind == tyGenericParam): 
+      InternalError(a.info, "instantiateGenericParamList: " & q.name.s)
+    s.typ = t
+    addDecl(c, s)
+
+proc GenericCacheGet(c: PContext, genericSym, instSym: PSym): PSym = 
+  result = nil
+  for i in countup(0, sonsLen(c.generics) - 1): 
+    if c.generics.sons[i].kind != nkExprEqExpr: 
+      InternalError(genericSym.info, "GenericCacheGet")
+    var a = c.generics.sons[i].sons[0].sym
+    if genericSym.id == a.id: 
+      var b = c.generics.sons[i].sons[1].sym
+      if equalParams(b.typ.n, instSym.typ.n) == paramsEqual: 
+        #if gVerbosity > 0 then 
+        #  MessageOut('found in cache: ' + getProcHeader(instSym));
+        return b
+
+proc GenericCacheAdd(c: PContext, genericSym, instSym: PSym) = 
+  var n = newNode(nkExprEqExpr)
+  addSon(n, newSymNode(genericSym))
+  addSon(n, newSymNode(instSym))
+  addSon(c.generics, n)
+
+proc removeDefaultParamValues(n: PNode) = 
+  # we remove default params, because they cannot be instantiated properly
+  # and they are not needed anyway for instantiation (each param is already
+  # provided).
+  when false:
+    for i in countup(1, sonsLen(n)-1): 
+      var a = n.sons[i]
+      if a.kind != nkIdentDefs: IllFormedAst(a)
+      var L = a.len
+      if a.sons[L-1].kind != nkEmpty and a.sons[L-2].kind != nkEmpty:
+        # ``param: typ = defaultVal``. 
+        # We don't need defaultVal for semantic checking and it's wrong for
+        # ``cmp: proc (a, b: T): int = cmp``. Hm, for ``cmp = cmp`` that is
+        # not possible... XXX We don't solve this issue here.
+        a.sons[L-1] = ast.emptyNode
+
+proc generateInstance(c: PContext, fn: PSym, pt: TIdTable, 
+                      info: TLineInfo): PSym = 
+  # generates an instantiated proc
+  var 
+    oldPrc, oldMod: PSym
+    n: PNode
+  if c.InstCounter > 1000: InternalError(fn.ast.info, "nesting too deep")
+  inc(c.InstCounter)
+  # NOTE: for access of private fields within generics from a different module
+  # and other identifiers we fake the current module temporarily!
+  # XXX bad hack!
+  oldMod = c.module
+  c.module = getModule(fn)
+  result = copySym(fn, false)
+  incl(result.flags, sfFromGeneric)
+  result.owner = getCurrOwner().owner
+  n = copyTree(fn.ast)
+  result.ast = n
+  pushOwner(result)
+  openScope(c.tab)
+  if (n.sons[genericParamsPos].kind == nkEmpty): 
+    InternalError(n.info, "generateInstance")
+  n.sons[namePos] = newSymNode(result)
+  pushInfoContext(info)
+  instantiateGenericParamList(c, n.sons[genericParamsPos], pt)
+  n.sons[genericParamsPos] = ast.emptyNode
+  # semantic checking for the parameters:
+  if n.sons[paramsPos].kind != nkEmpty: 
+    removeDefaultParamValues(n.sons[ParamsPos])
+    semParamList(c, n.sons[ParamsPos], nil, result)
+    addParams(c, result.typ.n)
+  else: 
+    result.typ = newTypeS(tyProc, c)
+    addSon(result.typ, nil)
+  result.typ.callConv = fn.typ.callConv
+  oldPrc = GenericCacheGet(c, fn, result)
+  if oldPrc == nil: 
+    # add it here, so that recursive generic procs are possible:
+    GenericCacheAdd(c, fn, result)
+    addDecl(c, result)
+    if n.sons[codePos].kind != nkEmpty: 
+      pushProcCon(c, result)
+      if result.kind in {skProc, skMethod, skConverter}: 
+        addResult(c, result.typ.sons[0], n.info)
+        addResultNode(c, n)
+      n.sons[codePos] = semStmtScope(c, n.sons[codePos])
+      popProcCon(c)
+  else:
+    result = oldPrc
+  popInfoContext()
+  closeScope(c.tab)           # close scope for parameters
+  popOwner()
+  c.module = oldMod
+  dec(c.InstCounter)
+  
+proc instGenericContainer(c: PContext, n: PNode, header: PType): PType = 
+  var cl: TReplTypeVars
+  InitIdTable(cl.symMap)
+  InitIdTable(cl.typeMap)
+  cl.info = n.info
+  cl.c = c
+  result = ReplaceTypeVarsT(cl, header)
+