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#
#
# The Nimrod Compiler
# (c) Copyright 2011 Andreas Rumpf
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
# this module does the semantic checking of type declarations
proc fitNode(c: PContext, formal: PType, arg: PNode): PNode =
result = IndexTypesMatch(c, formal, arg.typ, arg)
if result == nil:
#debug(arg)
typeMismatch(arg, formal, arg.typ)
proc newOrPrevType(kind: TTypeKind, prev: PType, c: PContext): PType =
if prev == nil:
result = newTypeS(kind, c)
else:
result = prev
if result.kind == tyForward: result.kind = kind
proc semEnum(c: PContext, n: PNode, prev: PType): PType =
var
counter, x: BiggestInt
e: PSym
base: PType
counter = 0
base = nil
result = newOrPrevType(tyEnum, prev, c)
result.n = newNodeI(nkEnumTy, n.info)
checkMinSonsLen(n, 1)
if n.sons[0].kind != nkEmpty:
base = semTypeNode(c, n.sons[0].sons[0], nil)
if base.kind != tyEnum:
localError(n.sons[0].info, errInheritanceOnlyWithEnums)
counter = lastOrd(base) + 1
addSon(result, base)
for i in countup(1, sonsLen(n) - 1):
case n.sons[i].kind
of nkEnumFieldDef:
e = newSymS(skEnumField, n.sons[i].sons[0], c)
var v = semConstExpr(c, n.sons[i].sons[1])
var strVal: PNode = nil
case skipTypes(v.typ, abstractInst).kind
of tyTuple:
if sonsLen(v) != 2: GlobalError(v.info, errWrongNumberOfVariables)
strVal = v.sons[1] # second tuple part is the string value
if skipTypes(strVal.typ, abstractInst).kind notin {tyString, tyCstring}:
GlobalError(strVal.info, errStringLiteralExpected)
x = getOrdValue(v.sons[0]) # first tuple part is the ordinal
of tyString, tyCstring:
strVal = v
x = counter
else:
x = getOrdValue(v)
if i != 1:
if (x != counter): incl(result.flags, tfEnumHasWholes)
if x < counter:
GlobalError(n.sons[i].info, errInvalidOrderInEnumX, e.name.s)
e.ast = strVal # might be nil
counter = x
of nkSym:
e = n.sons[i].sym
of nkIdent:
e = newSymS(skEnumField, n.sons[i], c)
else: illFormedAst(n)
e.typ = result
e.position = int(counter)
if (result.sym != nil) and (sfInInterface in result.sym.flags):
incl(e.flags, sfUsed) # BUGFIX
incl(e.flags, sfInInterface) # BUGFIX
StrTableAdd(c.module.tab, e) # BUGFIX
addSon(result.n, newSymNode(e))
addDeclAt(c, e, c.tab.tos - 1)
inc(counter)
proc semSet(c: PContext, n: PNode, prev: PType): PType =
result = newOrPrevType(tySet, prev, c)
if sonsLen(n) == 2:
var base = semTypeNode(c, n.sons[1], nil)
addSon(result, base)
if base.kind == tyGenericInst: base = lastSon(base)
if base.kind != tyGenericParam:
if not isOrdinalType(base): GlobalError(n.info, errOrdinalTypeExpected)
if lengthOrd(base) > MaxSetElements: GlobalError(n.info, errSetTooBig)
else:
GlobalError(n.info, errXExpectsOneTypeParam, "set")
proc semContainer(c: PContext, n: PNode, kind: TTypeKind, kindStr: string,
prev: PType): PType =
result = newOrPrevType(kind, prev, c)
if sonsLen(n) == 2:
var base = semTypeNode(c, n.sons[1], nil)
addSon(result, base)
else:
GlobalError(n.info, errXExpectsOneTypeParam, kindStr)
proc semAnyRef(c: PContext, n: PNode, kind: TTypeKind, kindStr: string,
prev: PType): PType =
result = newOrPrevType(kind, prev, c)
if sonsLen(n) == 1:
var base = semTypeNode(c, n.sons[0], nil)
addSon(result, base)
else:
GlobalError(n.info, errXExpectsOneTypeParam, kindStr)
proc semVarType(c: PContext, n: PNode, prev: PType): PType =
result = newOrPrevType(tyVar, prev, c)
if sonsLen(n) == 1:
var base = semTypeNode(c, n.sons[0], nil)
if base.kind == tyVar: GlobalError(n.info, errVarVarTypeNotAllowed)
addSon(result, base)
else:
GlobalError(n.info, errXExpectsOneTypeParam, "var")
proc semDistinct(c: PContext, n: PNode, prev: PType): PType =
result = newOrPrevType(tyDistinct, prev, c)
if sonsLen(n) == 1: addSon(result, semTypeNode(c, n.sons[0], nil))
else: GlobalError(n.info, errXExpectsOneTypeParam, "distinct")
proc semRangeAux(c: PContext, n: PNode, prev: PType): PType =
if (n.kind != nkRange): InternalError(n.info, "semRangeAux")
checkSonsLen(n, 2)
result = newOrPrevType(tyRange, prev, c)
result.n = newNodeI(nkRange, n.info)
if (n.sons[0].kind == nkEmpty) or (n.sons[1].kind == nkEmpty):
GlobalError(n.Info, errRangeIsEmpty)
var a = semConstExpr(c, n.sons[0])
var b = semConstExpr(c, n.sons[1])
if not sameType(a.typ, b.typ): GlobalError(n.info, errPureTypeMismatch)
if not (a.typ.kind in
{tyInt..tyInt64, tyEnum, tyBool, tyChar, tyFloat..tyFloat128}):
GlobalError(n.info, errOrdinalTypeExpected)
if enumHasWholes(a.typ):
GlobalError(n.info, errEnumXHasHoles, a.typ.sym.name.s)
if not leValue(a, b): GlobalError(n.Info, errRangeIsEmpty)
addSon(result.n, a)
addSon(result.n, b)
addSon(result, b.typ)
proc semRange(c: PContext, n: PNode, prev: PType): PType =
result = nil
if sonsLen(n) == 2:
if n.sons[1].kind == nkRange: result = semRangeAux(c, n.sons[1], prev)
else: GlobalError(n.sons[0].info, errRangeExpected)
else:
GlobalError(n.info, errXExpectsOneTypeParam, "range")
proc semArray(c: PContext, n: PNode, prev: PType): PType =
var indx, base: PType
result = newOrPrevType(tyArray, prev, c)
if sonsLen(n) == 3:
# 3 = length(array indx base)
if n.sons[1].kind == nkRange: indx = semRangeAux(c, n.sons[1], nil)
else: indx = semTypeNode(c, n.sons[1], nil)
addSon(result, indx)
if indx.kind == tyGenericInst: indx = lastSon(indx)
if indx.kind != tyGenericParam:
if not isOrdinalType(indx):
GlobalError(n.sons[1].info, errOrdinalTypeExpected)
if enumHasWholes(indx):
GlobalError(n.sons[1].info, errEnumXHasHoles, indx.sym.name.s)
base = semTypeNode(c, n.sons[2], nil)
addSon(result, base)
else:
GlobalError(n.info, errArrayExpectsTwoTypeParams)
proc semOrdinal(c: PContext, n: PNode, prev: PType): PType =
result = newOrPrevType(tyOrdinal, prev, c)
if sonsLen(n) == 2:
var base = semTypeNode(c, n.sons[1], nil)
if base.kind != tyGenericParam:
if not isOrdinalType(base):
GlobalError(n.sons[1].info, errOrdinalTypeExpected)
addSon(result, base)
else:
GlobalError(n.info, errXExpectsOneTypeParam, "ordinal")
proc semTypeIdent(c: PContext, n: PNode): PSym =
result = qualifiedLookup(c, n, {checkAmbiguity, checkUndeclared})
if (result != nil):
markUsed(n, result)
if result.kind != skType: GlobalError(n.info, errTypeExpected)
else:
GlobalError(n.info, errIdentifierExpected)
proc semTuple(c: PContext, n: PNode, prev: PType): PType =
var
typ: PType
check: TIntSet
result = newOrPrevType(tyTuple, prev, c)
result.n = newNodeI(nkRecList, n.info)
IntSetInit(check)
var counter = 0
for i in countup(0, sonsLen(n) - 1):
var a = n.sons[i]
if (a.kind != nkIdentDefs): IllFormedAst(a)
checkMinSonsLen(a, 3)
var length = sonsLen(a)
if a.sons[length - 2].kind != nkEmpty:
typ = semTypeNode(c, a.sons[length - 2], nil)
else: GlobalError(a.info, errTypeExpected)
if a.sons[length - 1].kind != nkEmpty:
GlobalError(a.sons[length - 1].info, errInitHereNotAllowed)
for j in countup(0, length - 3):
var field = newSymS(skField, a.sons[j], c)
field.typ = typ
field.position = counter
inc(counter)
if IntSetContainsOrIncl(check, field.name.id):
GlobalError(a.sons[j].info, errAttemptToRedefine, field.name.s)
addSon(result.n, newSymNode(field))
addSon(result, typ)
proc semGeneric(c: PContext, n: PNode, s: PSym, prev: PType): PType =
var
elem: PType
isConcrete: bool
if (s.typ == nil) or (s.typ.kind != tyGenericBody):
GlobalError(n.info, errCannotInstantiateX, s.name.s)
result = newOrPrevType(tyGenericInvokation, prev, c)
if (s.typ.containerID == 0): InternalError(n.info, "semtypes.semGeneric")
if sonsLen(n) != sonsLen(s.typ):
GlobalError(n.info, errWrongNumberOfArguments)
addSon(result, s.typ)
isConcrete = true # iterate over arguments:
for i in countup(1, sonsLen(n) - 1):
elem = semTypeNode(c, n.sons[i], nil)
if elem.kind == tyGenericParam: isConcrete = false
addSon(result, elem)
if isConcrete:
if s.ast == nil: GlobalError(n.info, errCannotInstantiateX, s.name.s)
result = instGenericContainer(c, n, result)
proc semIdentVis(c: PContext, kind: TSymKind, n: PNode,
allowed: TSymFlags): PSym =
# identifier with visibility
if n.kind == nkPostfix:
if sonsLen(n) == 2 and n.sons[0].kind == nkIdent:
result = newSymS(kind, n.sons[1], c)
var v = n.sons[0].ident
if (sfStar in allowed) and (v.id == ord(wStar)):
incl(result.flags, sfStar)
elif (sfMinus in allowed) and (v.id == ord(wMinus)):
incl(result.flags, sfMinus)
else:
LocalError(n.sons[0].info, errInvalidVisibilityX, v.s)
else:
illFormedAst(n)
else:
result = newSymS(kind, n, c)
proc semIdentWithPragma(c: PContext, kind: TSymKind, n: PNode,
allowed: TSymFlags): PSym =
if n.kind == nkPragmaExpr:
checkSonsLen(n, 2)
result = semIdentVis(c, kind, n.sons[0], allowed)
case kind
of skType:
# process pragmas later, because result.typ has not been set yet
of skField: pragma(c, result, n.sons[1], fieldPragmas)
of skVar: pragma(c, result, n.sons[1], varPragmas)
of skConst: pragma(c, result, n.sons[1], constPragmas)
else: nil
else:
result = semIdentVis(c, kind, n, allowed)
proc checkForOverlap(c: PContext, t, ex: PNode, branchIndex: int) =
for i in countup(1, branchIndex - 1):
for j in countup(0, sonsLen(t.sons[i]) - 2):
if overlap(t.sons[i].sons[j], ex):
LocalError(ex.info, errDuplicateCaseLabel)
proc semBranchExpr(c: PContext, t: PNode, ex: var PNode) =
ex = semConstExpr(c, ex)
checkMinSonsLen(t, 1)
if (cmpTypes(t.sons[0].typ, ex.typ) <= isConvertible):
typeMismatch(ex, t.sons[0].typ, ex.typ)
proc SemCaseBranch(c: PContext, t, branch: PNode, branchIndex: int,
covered: var biggestInt) =
for i in countup(0, sonsLen(branch) - 2):
var b = branch.sons[i]
if b.kind == nkRange:
checkSonsLen(b, 2)
semBranchExpr(c, t, b.sons[0])
semBranchExpr(c, t, b.sons[1])
if emptyRange(b.sons[0], b.sons[1]):
#MessageOut(renderTree(t));
GlobalError(b.info, errRangeIsEmpty)
covered = covered + getOrdValue(b.sons[1]) - getOrdValue(b.sons[0]) + 1
else:
semBranchExpr(c, t, branch.sons[i]) # NOT: `b`, because of var-param!
inc(covered)
checkForOverlap(c, t, branch.sons[i], branchIndex)
proc semRecordNodeAux(c: PContext, n: PNode, check: var TIntSet, pos: var int,
father: PNode, rectype: PSym)
proc semRecordCase(c: PContext, n: PNode, check: var TIntSet, pos: var int,
father: PNode, rectype: PSym) =
var
covered: biggestint
chckCovered: bool
a, b: PNode
typ: PType
a = copyNode(n)
checkMinSonsLen(n, 2)
semRecordNodeAux(c, n.sons[0], check, pos, a, rectype)
if a.sons[0].kind != nkSym:
internalError("semRecordCase: dicriminant is no symbol")
incl(a.sons[0].sym.flags, sfDiscriminant)
covered = 0
typ = skipTypes(a.sons[0].Typ, abstractVar)
if not isOrdinalType(typ): GlobalError(n.info, errSelectorMustBeOrdinal)
if firstOrd(typ) < 0:
GlobalError(n.info, errOrdXMustNotBeNegative, a.sons[0].sym.name.s)
if lengthOrd(typ) > 0x00007FFF:
GlobalError(n.info, errLenXinvalid, a.sons[0].sym.name.s)
chckCovered = true
for i in countup(1, sonsLen(n) - 1):
b = copyTree(n.sons[i])
case n.sons[i].kind
of nkOfBranch:
checkMinSonsLen(b, 2)
semCaseBranch(c, a, b, i, covered)
of nkElse:
chckCovered = false
checkSonsLen(b, 1)
else: illFormedAst(n)
delSon(b, sonsLen(b) - 1)
semRecordNodeAux(c, lastSon(n.sons[i]), check, pos, b, rectype)
addSon(a, b)
if chckCovered and (covered != lengthOrd(a.sons[0].typ)):
localError(a.info, errNotAllCasesCovered)
addSon(father, a)
proc semRecordNodeAux(c: PContext, n: PNode, check: var TIntSet, pos: var int,
father: PNode, rectype: PSym) =
var
length: int
f: PSym # new field
a, it, e, branch: PNode
typ: PType
if n == nil:
return # BUGFIX: nil is possible
case n.kind
of nkRecWhen:
branch = nil # the branch to take
for i in countup(0, sonsLen(n) - 1):
it = n.sons[i]
if it == nil: illFormedAst(n)
case it.kind
of nkElifBranch:
checkSonsLen(it, 2)
e = semConstExpr(c, it.sons[0])
checkBool(e)
if (e.kind != nkIntLit): InternalError(e.info, "semRecordNodeAux")
if (e.intVal != 0) and (branch == nil): branch = it.sons[1]
of nkElse:
checkSonsLen(it, 1)
if branch == nil: branch = it.sons[0]
else: illFormedAst(n)
if branch != nil: semRecordNodeAux(c, branch, check, pos, father, rectype)
of nkRecCase:
semRecordCase(c, n, check, pos, father, rectype)
of nkNilLit:
if father.kind != nkRecList: addSon(father, newNodeI(nkRecList, n.info))
of nkRecList:
# attempt to keep the nesting at a sane level:
var a = if father.kind == nkRecList: father else: copyNode(n)
for i in countup(0, sonsLen(n) - 1):
semRecordNodeAux(c, n.sons[i], check, pos, a, rectype)
if a != father: addSon(father, a)
of nkIdentDefs:
checkMinSonsLen(n, 3)
length = sonsLen(n)
if (father.kind != nkRecList) and (length >= 4):
a = newNodeI(nkRecList, n.info)
else:
a = ast.emptyNode
if n.sons[length - 1].kind != nkEmpty:
localError(n.sons[length - 1].info, errInitHereNotAllowed)
if n.sons[length - 2].kind == nkEmpty:
GlobalError(n.info, errTypeExpected)
typ = semTypeNode(c, n.sons[length-2], nil)
for i in countup(0, sonsLen(n) - 3):
f = semIdentWithPragma(c, skField, n.sons[i], {sfStar, sfMinus})
f.typ = typ
f.position = pos
if (rectype != nil) and ({sfImportc, sfExportc} * rectype.flags != {}) and
(f.loc.r == nil):
f.loc.r = toRope(f.name.s)
f.flags = f.flags + ({sfImportc, sfExportc} * rectype.flags)
inc(pos)
if IntSetContainsOrIncl(check, f.name.id):
localError(n.sons[i].info, errAttemptToRedefine, f.name.s)
if a.kind == nkEmpty: addSon(father, newSymNode(f))
else: addSon(a, newSymNode(f))
if a.kind != nkEmpty: addSon(father, a)
of nkEmpty: nil
else: illFormedAst(n)
proc addInheritedFieldsAux(c: PContext, check: var TIntSet, pos: var int,
n: PNode) =
case n.kind
of nkRecCase:
if (n.sons[0].kind != nkSym): InternalError(n.info, "addInheritedFieldsAux")
addInheritedFieldsAux(c, check, pos, n.sons[0])
for i in countup(1, sonsLen(n) - 1):
case n.sons[i].kind
of nkOfBranch, nkElse:
addInheritedFieldsAux(c, check, pos, lastSon(n.sons[i]))
else: internalError(n.info, "addInheritedFieldsAux(record case branch)")
of nkRecList:
for i in countup(0, sonsLen(n) - 1):
addInheritedFieldsAux(c, check, pos, n.sons[i])
of nkSym:
IntSetIncl(check, n.sym.name.id)
inc(pos)
else: InternalError(n.info, "addInheritedFieldsAux()")
proc addInheritedFields(c: PContext, check: var TIntSet, pos: var int,
obj: PType) =
if (sonsLen(obj) > 0) and (obj.sons[0] != nil):
addInheritedFields(c, check, pos, obj.sons[0])
addInheritedFieldsAux(c, check, pos, obj.n)
proc semObjectNode(c: PContext, n: PNode, prev: PType): PType =
var
check: TIntSet
base: PType
pos: int
IntSetInit(check)
pos = 0 # n.sons[0] contains the pragmas (if any). We process these later...
checkSonsLen(n, 3)
if n.sons[1].kind != nkEmpty:
base = semTypeNode(c, n.sons[1].sons[0], nil)
if base.kind == tyObject: addInheritedFields(c, check, pos, base)
else: localError(n.sons[1].info, errInheritanceOnlyWithNonFinalObjects)
else:
base = nil
if n.kind != nkObjectTy: InternalError(n.info, "semObjectNode")
result = newOrPrevType(tyObject, prev, c)
addSon(result, base)
result.n = newNodeI(nkRecList, n.info)
semRecordNodeAux(c, n.sons[2], check, pos, result.n, result.sym)
if (base != nil) and (tfFinal in base.flags):
localError(n.sons[1].info, errInheritanceOnlyWithNonFinalObjects)
proc addTypeVarsOfGenericBody(c: PContext, t: PType, genericParams: PNode,
cl: var TIntSet): PType =
result = t
if t == nil: return
if IntSetContainsOrIncl(cl, t.id): return
case t.kind
of tyGenericBody:
#debug(t)
result = newTypeS(tyGenericInvokation, c)
addSon(result, t)
for i in countup(0, sonsLen(t) - 2):
if t.sons[i].kind != tyGenericParam:
InternalError("addTypeVarsOfGenericBody")
# do not declare ``TKey`` twice:
#if not IntSetContainsOrIncl(cl, t.sons[i].sym.ident.id):
var s = copySym(t.sons[i].sym)
s.position = sonsLen(genericParams)
if s.typ == nil or s.typ.kind != tyGenericParam:
InternalError("addTypeVarsOfGenericBody 2")
addDecl(c, s)
addSon(genericParams, newSymNode(s))
addSon(result, t.sons[i])
of tyGenericInst:
#debug(t)
var L = sonsLen(t) - 1
t.sons[L] = addTypeVarsOfGenericBody(c, t.sons[L], genericParams, cl)
of tyGenericInvokation:
#debug(t)
for i in countup(1, sonsLen(t) - 1):
t.sons[i] = addTypeVarsOfGenericBody(c, t.sons[i], genericParams, cl)
else:
for i in countup(0, sonsLen(t) - 1):
t.sons[i] = addTypeVarsOfGenericBody(c, t.sons[i], genericParams, cl)
proc paramType(c: PContext, n, genericParams: PNode, cl: var TIntSet): PType =
result = semTypeNode(c, n, nil)
if (genericParams != nil) and (sonsLen(genericParams) == 0):
result = addTypeVarsOfGenericBody(c, result, genericParams, cl)
#if result.kind == tyGenericInvokation: debug(result)
proc semProcTypeNode(c: PContext, n, genericParams: PNode,
prev: PType): PType =
var
def, res: PNode
typ: PType
check, cl: TIntSet
checkMinSonsLen(n, 1)
result = newOrPrevType(tyProc, prev, c)
result.callConv = lastOptionEntry(c).defaultCC
result.n = newNodeI(nkFormalParams, n.info)
if (genericParams != nil) and (sonsLen(genericParams) == 0): IntSetInit(cl)
addSon(result, nil) # return type
res = newNodeI(nkType, n.info)
addSon(result.n, res)
IntSetInit(check)
var counter = 0
for i in countup(1, sonsLen(n) - 1):
var a = n.sons[i]
if a.kind != nkIdentDefs: IllFormedAst(a)
checkMinSonsLen(a, 3)
var length = sonsLen(a)
if a.sons[length - 2].kind != nkEmpty:
typ = paramType(c, a.sons[length - 2], genericParams, cl)
else:
typ = nil
if a.sons[length - 1].kind != nkEmpty:
def = semExprWithType(c, a.sons[length - 1])
# check type compability between def.typ and typ:
if typ == nil:
typ = def.typ
elif def != nil:
# and def.typ != nil and def.typ.kind != tyNone:
# example code that triggers it:
# proc sort[T](cmp: proc(a, b: T): int = cmp)
def = fitNode(c, typ, def)
else:
def = ast.emptyNode
for j in countup(0, length - 3):
var arg = newSymS(skParam, a.sons[j], c)
arg.typ = typ
arg.position = counter
inc(counter)
if def.kind != nkEmpty: arg.ast = copyTree(def)
if IntSetContainsOrIncl(check, arg.name.id):
LocalError(a.sons[j].info, errAttemptToRedefine, arg.name.s)
addSon(result.n, newSymNode(arg))
addSon(result, typ)
if n.sons[0].kind != nkEmpty:
result.sons[0] = paramType(c, n.sons[0], genericParams, cl)
res.typ = result.sons[0]
proc semStmtListType(c: PContext, n: PNode, prev: PType): PType =
checkMinSonsLen(n, 1)
var length = sonsLen(n)
for i in countup(0, length - 2):
n.sons[i] = semStmt(c, n.sons[i])
if length > 0:
result = semTypeNode(c, n.sons[length - 1], prev)
n.typ = result
n.sons[length - 1].typ = result
else:
result = nil
proc semBlockType(c: PContext, n: PNode, prev: PType): PType =
Inc(c.p.nestedBlockCounter)
checkSonsLen(n, 2)
openScope(c.tab)
if n.sons[0].kind != nkEmpty:
addDecl(c, newSymS(skLabel, n.sons[0], c))
result = semStmtListType(c, n.sons[1], prev)
n.sons[1].typ = result
n.typ = result
closeScope(c.tab)
Dec(c.p.nestedBlockCounter)
proc semTypeNode(c: PContext, n: PNode, prev: PType): PType =
var
s: PSym
t: PType
result = nil
if gCmd == cmdIdeTools: suggestExpr(c, n)
case n.kind
of nkEmpty: nil
of nkTypeOfExpr:
result = semExprWithType(c, n, {efAllowType}).typ
of nkPar:
if sonsLen(n) == 1: result = semTypeNode(c, n.sons[0], prev)
else: GlobalError(n.info, errTypeExpected)
of nkBracketExpr:
checkMinSonsLen(n, 2)
s = semTypeIdent(c, n.sons[0])
case s.magic
of mArray: result = semArray(c, n, prev)
of mOpenArray: result = semContainer(c, n, tyOpenArray, "openarray", prev)
of mRange: result = semRange(c, n, prev)
of mSet: result = semSet(c, n, prev)
of mOrdinal: result = semOrdinal(c, n, prev)
of mSeq: result = semContainer(c, n, tySequence, "seq", prev)
else: result = semGeneric(c, n, s, prev)
of nkIdent, nkDotExpr, nkAccQuoted:
s = semTypeIdent(c, n)
if s.typ == nil: GlobalError(n.info, errTypeExpected)
if prev == nil:
result = s.typ
else:
assignType(prev, s.typ)
prev.id = s.typ.id
result = prev
of nkSym:
if (n.sym.kind == skType) and (n.sym.typ != nil):
t = n.sym.typ
if prev == nil:
result = t
else:
assignType(prev, t)
result = prev
markUsed(n, n.sym)
else:
GlobalError(n.info, errTypeExpected)
of nkObjectTy: result = semObjectNode(c, n, prev)
of nkTupleTy: result = semTuple(c, n, prev)
of nkRefTy: result = semAnyRef(c, n, tyRef, "ref", prev)
of nkPtrTy: result = semAnyRef(c, n, tyPtr, "ptr", prev)
of nkVarTy: result = semVarType(c, n, prev)
of nkDistinctTy: result = semDistinct(c, n, prev)
of nkProcTy:
checkSonsLen(n, 2)
result = semProcTypeNode(c, n.sons[0], nil, prev)
# dummy symbol for `pragma`:
s = newSymS(skProc, newIdentNode(getIdent("dummy"), n.info), c)
s.typ = result
pragma(c, s, n.sons[1], procTypePragmas)
of nkEnumTy:
result = semEnum(c, n, prev)
of nkType:
result = n.typ
of nkStmtListType:
result = semStmtListType(c, n, prev)
of nkBlockType:
result = semBlockType(c, n, prev)
else:
GlobalError(n.info, errTypeExpected)
#internalError(n.info, 'semTypeNode(' +{&} nodeKindToStr[n.kind] +{&} ')');
proc setMagicType(m: PSym, kind: TTypeKind, size: int) =
m.typ.kind = kind
m.typ.align = size
m.typ.size = size #m.typ.sym := nil;
proc processMagicType(c: PContext, m: PSym) =
case m.magic #registerSysType(m.typ);
of mInt: setMagicType(m, tyInt, intSize)
of mInt8: setMagicType(m, tyInt8, 1)
of mInt16: setMagicType(m, tyInt16, 2)
of mInt32: setMagicType(m, tyInt32, 4)
of mInt64: setMagicType(m, tyInt64, 8)
of mFloat: setMagicType(m, tyFloat, floatSize)
of mFloat32: setMagicType(m, tyFloat32, 4)
of mFloat64: setMagicType(m, tyFloat64, 8)
of mBool: setMagicType(m, tyBool, 1)
of mChar: setMagicType(m, tyChar, 1)
of mString:
setMagicType(m, tyString, ptrSize)
addSon(m.typ, getSysType(tyChar))
of mCstring:
setMagicType(m, tyCString, ptrSize)
addSon(m.typ, getSysType(tyChar))
of mPointer: setMagicType(m, tyPointer, ptrSize)
of mEmptySet:
setMagicType(m, tySet, 1)
addSon(m.typ, newTypeS(tyEmpty, c))
of mIntSetBaseType:
setMagicType(m, tyRange, intSize) #intSetBaseType := m.typ;
return
of mNil: setMagicType(m, tyNil, ptrSize)
of mExpr: setMagicType(m, tyExpr, 0)
of mStmt: setMagicType(m, tyStmt, 0)
of mTypeDesc: setMagicType(m, tyTypeDesc, 0)
of mArray, mOpenArray, mRange, mSet, mSeq, mOrdinal: return
else: GlobalError(m.info, errTypeExpected)
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