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#
#
# The Nim Compiler
# (c) Copyright 2015 Andreas Rumpf
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
# This include file implements the semantic checking for magics.
# included from sem.nim
proc semAddr(c: PContext; n: PNode; isUnsafeAddr=false): PNode =
result = newNodeI(nkAddr, n.info)
let x = semExprWithType(c, n)
if x.kind == nkSym:
x.sym.flags.incl(sfAddrTaken)
if isAssignable(c, x, isUnsafeAddr) notin {arLValue, arLocalLValue}:
localError(n.info, errExprHasNoAddress)
result.add x
result.typ = makePtrType(c, x.typ)
proc semTypeOf(c: PContext; n: PNode): PNode =
result = newNodeI(nkTypeOfExpr, n.info)
let typExpr = semExprWithType(c, n, {efInTypeof})
result.add typExpr
result.typ = makeTypeDesc(c, typExpr.typ)
type
SemAsgnMode = enum asgnNormal, noOverloadedSubscript, noOverloadedAsgn
proc semAsgn(c: PContext, n: PNode; mode=asgnNormal): PNode
proc semSubscript(c: PContext, n: PNode, flags: TExprFlags): PNode
proc skipAddr(n: PNode): PNode {.inline.} =
(if n.kind == nkHiddenAddr: n.sons[0] else: n)
proc semArrGet(c: PContext; n: PNode; flags: TExprFlags): PNode =
result = newNodeI(nkBracketExpr, n.info)
for i in 1..<n.len: result.add(n[i])
let oldBracketExpr = c.p.bracketExpr
result = semSubscript(c, result, flags)
c.p.bracketExpr = oldBracketExpr
if result.isNil:
let x = copyTree(n)
x.sons[0] = newIdentNode(getIdent"[]", n.info)
bracketNotFoundError(c, x)
#localError(n.info, "could not resolve: " & $n)
result = n
proc semArrPut(c: PContext; n: PNode; flags: TExprFlags): PNode =
# rewrite `[]=`(a, i, x) back to ``a[i] = x``.
let b = newNodeI(nkBracketExpr, n.info)
b.add(n[1].skipAddr)
for i in 2..n.len-2: b.add(n[i])
result = newNodeI(nkAsgn, n.info, 2)
result.sons[0] = b
result.sons[1] = n.lastSon
result = semAsgn(c, result, noOverloadedSubscript)
proc semAsgnOpr(c: PContext; n: PNode): PNode =
result = newNodeI(nkAsgn, n.info, 2)
result.sons[0] = n[1]
result.sons[1] = n[2]
result = semAsgn(c, result, noOverloadedAsgn)
proc semIsPartOf(c: PContext, n: PNode, flags: TExprFlags): PNode =
var r = isPartOf(n[1], n[2])
result = newIntNodeT(ord(r), n)
proc expectIntLit(c: PContext, n: PNode): int =
let x = c.semConstExpr(c, n)
case x.kind
of nkIntLit..nkInt64Lit: result = int(x.intVal)
else: localError(n.info, errIntLiteralExpected)
proc semInstantiationInfo(c: PContext, n: PNode): PNode =
result = newNodeIT(nkPar, n.info, n.typ)
let idx = expectIntLit(c, n.sons[1])
let useFullPaths = expectIntLit(c, n.sons[2])
let info = getInfoContext(idx)
var filename = newNodeIT(nkStrLit, n.info, getSysType(tyString))
filename.strVal = if useFullPaths != 0: info.toFullPath else: info.toFilename
var line = newNodeIT(nkIntLit, n.info, getSysType(tyInt))
line.intVal = toLinenumber(info)
result.add(filename)
result.add(line)
proc toNode(t: PType, i: TLineInfo): PNode =
result = newNodeIT(nkType, i, t)
const
# these are types that use the bracket syntax for instantiation
# they can be subjected to the type traits `genericHead` and
# `Uninstantiated`
tyUserDefinedGenerics* = {tyGenericInst, tyGenericInvocation,
tyUserTypeClassInst}
tyMagicGenerics* = {tySet, tySequence, tyArray, tyOpenArray}
tyGenericLike* = tyUserDefinedGenerics +
tyMagicGenerics +
{tyCompositeTypeClass}
proc uninstantiate(t: PType): PType =
result = case t.kind
of tyMagicGenerics: t
of tyUserDefinedGenerics: t.base
of tyCompositeTypeClass: uninstantiate t.sons[1]
else: t
proc evalTypeTrait(traitCall: PNode, operand: PType, context: PSym): PNode =
const skippedTypes = {tyTypeDesc, tyAlias}
let trait = traitCall[0]
internalAssert trait.kind == nkSym
var operand = operand.skipTypes(skippedTypes)
template operand2: PType =
traitCall.sons[2].typ.skipTypes({tyTypeDesc})
template typeWithSonsResult(kind, sons): PNode =
newTypeWithSons(context, kind, sons).toNode(traitCall.info)
case trait.sym.name.s
of "or", "|":
return typeWithSonsResult(tyOr, @[operand, operand2])
of "and":
return typeWithSonsResult(tyAnd, @[operand, operand2])
of "not":
return typeWithSonsResult(tyNot, @[operand])
of "name":
result = newStrNode(nkStrLit, operand.typeToString(preferName))
result.typ = newType(tyString, context)
result.info = traitCall.info
of "arity":
result = newIntNode(nkIntLit, operand.len - ord(operand.kind==tyProc))
result.typ = newType(tyInt, context)
result.info = traitCall.info
of "genericHead":
var res = uninstantiate(operand)
if res == operand and res.kind notin tyMagicGenerics:
localError(traitCall.info,
"genericHead expects a generic type. The given type was " &
typeToString(operand))
return newType(tyError, context).toNode(traitCall.info)
result = res.base.toNode(traitCall.info)
of "stripGenericParams":
result = uninstantiate(operand).toNode(traitCall.info)
else:
internalAssert false
proc semTypeTraits(c: PContext, n: PNode): PNode =
checkMinSonsLen(n, 2)
let t = n.sons[1].typ
internalAssert t != nil and t.kind == tyTypeDesc
if t.sonsLen > 0:
# This is either a type known to sem or a typedesc
# param to a regular proc (again, known at instantiation)
result = evalTypeTrait(n, t, getCurrOwner(c))
else:
# a typedesc variable, pass unmodified to evals
result = n
proc semOrd(c: PContext, n: PNode): PNode =
result = n
let parType = n.sons[1].typ
if isOrdinalType(parType) or parType.kind == tySet:
result.typ = makeRangeType(c, firstOrd(parType), lastOrd(parType), n.info)
else:
localError(n.info, errOrdinalTypeExpected)
result.typ = errorType(c)
proc semBindSym(c: PContext, n: PNode): PNode =
result = copyNode(n)
result.add(n.sons[0])
let sl = semConstExpr(c, n.sons[1])
if sl.kind notin {nkStrLit, nkRStrLit, nkTripleStrLit}:
localError(n.sons[1].info, errStringLiteralExpected)
return errorNode(c, n)
let isMixin = semConstExpr(c, n.sons[2])
if isMixin.kind != nkIntLit or isMixin.intVal < 0 or
isMixin.intVal > high(TSymChoiceRule).int:
localError(n.sons[2].info, errConstExprExpected)
return errorNode(c, n)
let id = newIdentNode(getIdent(sl.strVal), n.info)
let s = qualifiedLookUp(c, id, {checkUndeclared})
if s != nil:
# we need to mark all symbols:
var sc = symChoice(c, id, s, TSymChoiceRule(isMixin.intVal))
result.add(sc)
else:
errorUndeclaredIdentifier(c, n.sons[1].info, sl.strVal)
proc semShallowCopy(c: PContext, n: PNode, flags: TExprFlags): PNode
proc isStrangeArray(t: PType): bool =
let t = t.skipTypes(abstractInst)
result = t.kind == tyArray and t.firstOrd != 0
proc magicsAfterOverloadResolution(c: PContext, n: PNode,
flags: TExprFlags): PNode =
case n[0].sym.magic
of mAddr:
checkSonsLen(n, 2)
result = semAddr(c, n.sons[1], n[0].sym.name.s == "unsafeAddr")
of mTypeOf:
checkSonsLen(n, 2)
result = semTypeOf(c, n.sons[1])
of mArrGet: result = semArrGet(c, n, flags)
of mArrPut: result = semArrPut(c, n, flags)
of mAsgn: result = semAsgnOpr(c, n)
of mIsPartOf: result = semIsPartOf(c, n, flags)
of mTypeTrait: result = semTypeTraits(c, n)
of mAstToStr:
result = newStrNodeT(renderTree(n[1], {renderNoComments}), n)
result.typ = getSysType(tyString)
of mInstantiationInfo: result = semInstantiationInfo(c, n)
of mOrd: result = semOrd(c, n)
of mHigh, mLow: result = semLowHigh(c, n, n[0].sym.magic)
of mShallowCopy: result = semShallowCopy(c, n, flags)
of mNBindSym: result = semBindSym(c, n)
of mProcCall:
result = n
result.typ = n[1].typ
of mDotDot:
result = n
of mRoof:
let bracketExpr = if n.len == 3: n.sons[2] else: c.p.bracketExpr
if bracketExpr.isNil:
localError(n.info, "no surrounding array access context for '^'")
result = n.sons[1]
elif bracketExpr.checkForSideEffects != seNoSideEffect:
localError(n.info, "invalid context for '^' as '$#' has side effects" %
renderTree(bracketExpr))
result = n.sons[1]
elif bracketExpr.typ.isStrangeArray:
localError(n.info, "invalid context for '^' as len!=high+1 for '$#'" %
renderTree(bracketExpr))
result = n.sons[1]
else:
# ^x is rewritten to: len(a)-x
let lenExpr = newNodeI(nkCall, n.info)
lenExpr.add newIdentNode(getIdent"len", n.info)
lenExpr.add bracketExpr
let lenExprB = semExprWithType(c, lenExpr)
if lenExprB.typ.isNil or not isOrdinalType(lenExprB.typ):
localError(n.info, "'$#' has to be of an ordinal type for '^'" %
renderTree(lenExpr))
result = n.sons[1]
else:
result = newNodeIT(nkCall, n.info, getSysType(tyInt))
let subi = getSysMagic("-", mSubI)
#echo "got ", typeToString(subi.typ)
result.add newSymNode(subi, n.info)
result.add lenExprB
result.add n.sons[1]
of mPlugin:
let plugin = getPlugin(n[0].sym)
if plugin.isNil:
localError(n.info, "cannot find plugin " & n[0].sym.name.s)
result = n
else:
result = plugin(c, n)
else: result = n
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