big repo cleanup
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Araq
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246 changed files with 28 additions and 74652 deletions
204
compiler/semtempl.nim
Executable file
204
compiler/semtempl.nim
Executable file
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#
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#
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# The Nimrod Compiler
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# (c) Copyright 2011 Andreas Rumpf
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#
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# See the file "copying.txt", included in this
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# distribution, for details about the copyright.
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#
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proc isExpr(n: PNode): bool =
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# returns true if ``n`` looks like an expression
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case n.kind
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of nkIdent..nkNilLit:
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result = true
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of nkCall..nkPassAsOpenArray:
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for i in countup(0, sonsLen(n) - 1):
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if not isExpr(n.sons[i]):
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return false
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result = true
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else: result = false
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proc isTypeDesc(n: PNode): bool =
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# returns true if ``n`` looks like a type desc
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case n.kind
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of nkIdent, nkSym, nkType:
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result = true
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of nkDotExpr, nkBracketExpr:
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for i in countup(0, sonsLen(n) - 1):
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if not isTypeDesc(n.sons[i]):
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return false
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result = true
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of nkTypeOfExpr..nkEnumTy:
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result = true
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else: result = false
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proc evalTemplateAux(c: PContext, templ, actual: PNode, sym: PSym): PNode =
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case templ.kind
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of nkSym:
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var p = templ.sym
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if (p.kind == skParam) and (p.owner.id == sym.id):
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result = copyTree(actual.sons[p.position])
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else:
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result = copyNode(templ)
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of nkNone..nkIdent, nkType..nkNilLit: # atom
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result = copyNode(templ)
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else:
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result = copyNode(templ)
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newSons(result, sonsLen(templ))
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for i in countup(0, sonsLen(templ) - 1):
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result.sons[i] = evalTemplateAux(c, templ.sons[i], actual, sym)
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var evalTemplateCounter: int = 0
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# to prevend endless recursion in templates instantation
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proc evalTemplateArgs(c: PContext, n: PNode, s: PSym): PNode =
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var
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f, a: int
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arg: PNode
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f = sonsLen(s.typ)
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# if the template has zero arguments, it can be called without ``()``
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# `n` is then a nkSym or something similar
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case n.kind
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of nkCall, nkInfix, nkPrefix, nkPostfix, nkCommand, nkCallStrLit:
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a = sonsLen(n)
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else: a = 0
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if a > f: LocalError(n.info, errWrongNumberOfArguments)
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result = copyNode(n)
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for i in countup(1, f - 1):
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if i < a: arg = n.sons[i]
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else: arg = copyTree(s.typ.n.sons[i].sym.ast)
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if arg == nil or arg.kind == nkEmpty:
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LocalError(n.info, errWrongNumberOfArguments)
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elif not (s.typ.sons[i].kind in {tyTypeDesc, tyStmt, tyExpr}):
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# concrete type means semantic checking for argument:
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# XXX This is horrible! Better make semantic checking use some kind
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# of fixpoint iteration ...
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arg = fitNode(c, s.typ.sons[i], semExprWithType(c, arg))
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addSon(result, arg)
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proc evalTemplate(c: PContext, n: PNode, sym: PSym): PNode =
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var args: PNode
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inc(evalTemplateCounter)
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if evalTemplateCounter <= 100:
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# replace each param by the corresponding node:
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args = evalTemplateArgs(c, n, sym)
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result = evalTemplateAux(c, sym.ast.sons[codePos], args, sym)
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dec(evalTemplateCounter)
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else:
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GlobalError(n.info, errTemplateInstantiationTooNested)
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result = n
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proc symChoice(c: PContext, n: PNode, s: PSym): PNode =
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var
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a: PSym
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o: TOverloadIter
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i: int
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i = 0
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a = initOverloadIter(o, c, n)
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while a != nil:
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a = nextOverloadIter(o, c, n)
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inc(i)
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if i <= 1:
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result = newSymNode(s)
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result.info = n.info
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markUsed(n, s)
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else:
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# semantic checking requires a type; ``fitNode`` deals with it
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# appropriately
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result = newNodeIT(nkSymChoice, n.info, newTypeS(tyNone, c))
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a = initOverloadIter(o, c, n)
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while a != nil:
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addSon(result, newSymNode(a))
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a = nextOverloadIter(o, c, n)
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proc resolveTemplateParams(c: PContext, n: PNode, withinBind: bool,
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toBind: var TIntSet): PNode =
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var s: PSym
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case n.kind
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of nkIdent:
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if not withinBind and not IntSetContains(toBind, n.ident.id):
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s = SymTabLocalGet(c.Tab, n.ident)
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if (s != nil):
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result = newSymNode(s)
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result.info = n.info
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else:
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result = n
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else:
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IntSetIncl(toBind, n.ident.id)
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result = symChoice(c, n, lookup(c, n))
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of nkEmpty, nkSym..nkNilLit: # atom
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result = n
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of nkBind:
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result = resolveTemplateParams(c, n.sons[0], true, toBind)
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else:
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result = n
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for i in countup(0, sonsLen(n) - 1):
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result.sons[i] = resolveTemplateParams(c, n.sons[i], withinBind, toBind)
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proc transformToExpr(n: PNode): PNode =
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var realStmt: int
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result = n
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case n.kind
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of nkStmtList:
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realStmt = - 1
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for i in countup(0, sonsLen(n) - 1):
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case n.sons[i].kind
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of nkCommentStmt, nkEmpty, nkNilLit:
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nil
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else:
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if realStmt == - 1: realStmt = i
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else: realStmt = - 2
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if realStmt >= 0: result = transformToExpr(n.sons[realStmt])
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else: n.kind = nkStmtListExpr
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of nkBlockStmt:
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n.kind = nkBlockExpr
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#nkIfStmt: n.kind := nkIfExpr; // this is not correct!
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else:
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nil
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proc semTemplateDef(c: PContext, n: PNode): PNode =
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var
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s: PSym
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toBind: TIntSet
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if c.p.owner.kind == skModule:
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s = semIdentVis(c, skTemplate, n.sons[0], {sfStar})
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incl(s.flags, sfGlobal)
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else:
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s = semIdentVis(c, skTemplate, n.sons[0], {})
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if sfStar in s.flags:
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incl(s.flags, sfInInterface) # check parameter list:
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pushOwner(s)
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openScope(c.tab)
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n.sons[namePos] = newSymNode(s) # check that no pragmas exist:
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if n.sons[pragmasPos].kind != nkEmpty:
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LocalError(n.info, errNoPragmasAllowedForX, "template")
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# check that no generic parameters exist:
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if n.sons[genericParamsPos].kind != nkEmpty:
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LocalError(n.info, errNoGenericParamsAllowedForX, "template")
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if n.sons[paramsPos].kind == nkEmpty:
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# use ``stmt`` as implicit result type
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s.typ = newTypeS(tyProc, c)
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s.typ.n = newNodeI(nkFormalParams, n.info)
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addSon(s.typ, newTypeS(tyStmt, c))
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addSon(s.typ.n, newNodeIT(nkType, n.info, s.typ.sons[0]))
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else:
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semParamList(c, n.sons[ParamsPos], nil, s)
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if n.sons[paramsPos].sons[0].kind == nkEmpty:
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# use ``stmt`` as implicit result type
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s.typ.sons[0] = newTypeS(tyStmt, c)
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s.typ.n.sons[0] = newNodeIT(nkType, n.info, s.typ.sons[0])
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addParams(c, s.typ.n) # resolve parameters:
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IntSetInit(toBind)
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n.sons[codePos] = resolveTemplateParams(c, n.sons[codePos], false, toBind)
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if not (s.typ.sons[0].kind in {tyStmt, tyTypeDesc}):
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n.sons[codePos] = transformToExpr(n.sons[codePos])
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# only parameters are resolved, no type checking is performed
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closeScope(c.tab)
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popOwner()
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s.ast = n
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result = n
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if n.sons[codePos].kind == nkEmpty:
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LocalError(n.info, errImplOfXexpected, s.name.s)
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# add identifier of template as a last step to not allow recursive templates:
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addInterfaceDecl(c, s)
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