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view dmd/scope.c @ 1168:ab186e535e72
A different fix to #218 and DMD2682 that does not lead to constant folding regressions.
Fixes run/const_15, run/c/const_16_B.
The price is removing the lvalueness of struct literals. If it turns out too
much code depends on this behavior or we don't want to break with DMD, we
could keep struct literals as lvalues and instead convert struct literals used
as expression initializers into struct initializers.
author | Christian Kamm <kamm incasoftware de> |
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date | Sun, 29 Mar 2009 11:43:45 +0200 |
parents | f99a3b393c03 |
children | def7a1d494fd |
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// Copyright (c) 1999-2005 by Digital Mars // All Rights Reserved // written by Walter Bright // http://www.digitalmars.com // License for redistribution is by either the Artistic License // in artistic.txt, or the GNU General Public License in gnu.txt. // See the included readme.txt for details. #include <stdio.h> #include <assert.h> #include "root.h" #include "mars.h" #include "init.h" #include "identifier.h" #include "attrib.h" #include "dsymbol.h" #include "scope.h" #include "declaration.h" #include "aggregate.h" #include "module.h" #include "id.h" Scope *Scope::freelist = NULL; void *Scope::operator new(size_t size) { if (freelist) { Scope *s = freelist; freelist = s->enclosing; //printf("freelist %p\n", s); assert(s->flags & SCOPEfree); s->flags &= ~SCOPEfree; return s; } void *p = ::operator new(size); //printf("new %p\n", p); return p; } Scope::Scope() { // Create root scope //printf("Scope::Scope() %p\n", this); this->module = NULL; this->scopesym = NULL; this->sd = NULL; this->enclosing = NULL; this->parent = NULL; this->sw = NULL; this->enclosingFinally = NULL; this->enclosingScopeExit = NULL; this->tinst = NULL; this->sbreak = NULL; this->scontinue = NULL; this->fes = NULL; this->structalign = global.structalign; this->func = NULL; this->slabel = NULL; this->linkage = LINKd; this->protection = PROTpublic; this->explicitProtection = 0; this->stc = 0; this->offset = 0; this->inunion = 0; this->incontract = 0; this->nofree = 0; this->noctor = 0; this->noaccesscheck = 0; this->intypeof = 0; this->parameterSpecialization = 0; this->callSuper = 0; this->flags = 0; this->anonAgg = NULL; this->lastdc = NULL; this->lastoffset = 0; this->docbuf = NULL; } Scope::Scope(Scope *enclosing) { //printf("Scope::Scope(enclosing = %p) %p\n", enclosing, this); assert(!(enclosing->flags & SCOPEfree)); this->module = enclosing->module; this->func = enclosing->func; this->parent = enclosing->parent; this->scopesym = NULL; this->sd = NULL; this->sw = enclosing->sw; this->enclosingFinally = enclosing->enclosingFinally; this->enclosingScopeExit = enclosing->enclosingScopeExit; this->tinst = enclosing->tinst; this->sbreak = enclosing->sbreak; this->scontinue = enclosing->scontinue; this->fes = enclosing->fes; this->structalign = enclosing->structalign; this->enclosing = enclosing; #ifdef DEBUG if (enclosing->enclosing) assert(!(enclosing->enclosing->flags & SCOPEfree)); if (this == enclosing->enclosing) { printf("this = %p, enclosing = %p, enclosing->enclosing = %p\n", this, enclosing, enclosing->enclosing); } assert(this != enclosing->enclosing); #endif this->slabel = NULL; this->linkage = enclosing->linkage; this->protection = enclosing->protection; this->explicitProtection = enclosing->explicitProtection; this->stc = enclosing->stc; this->offset = 0; this->inunion = enclosing->inunion; this->incontract = enclosing->incontract; this->nofree = 0; this->noctor = enclosing->noctor; this->noaccesscheck = enclosing->noaccesscheck; this->intypeof = enclosing->intypeof; this->parameterSpecialization = enclosing->parameterSpecialization; this->callSuper = enclosing->callSuper; this->flags = 0; this->anonAgg = NULL; this->lastdc = NULL; this->lastoffset = 0; this->docbuf = enclosing->docbuf; assert(this != enclosing); } Scope *Scope::createGlobal(Module *module) { Scope *sc; sc = new Scope(); sc->module = module; sc->scopesym = new ScopeDsymbol(); sc->scopesym->symtab = new DsymbolTable(); // Add top level package as member of this global scope Dsymbol *m = module; while (m->parent) m = m->parent; m->addMember(NULL, sc->scopesym, 1); m->parent = NULL; // got changed by addMember() // Create the module scope underneath the global scope sc = sc->push(module); sc->parent = module; return sc; } Scope *Scope::push() { //printf("Scope::push()\n"); Scope *s = new Scope(this); assert(this != s); return s; } Scope *Scope::push(ScopeDsymbol *ss) { //printf("Scope::push(%s)\n", ss->toChars()); Scope *s = push(); s->scopesym = ss; return s; } Scope *Scope::pop() { //printf("Scope::pop() %p nofree = %d\n", this, nofree); Scope *enc = enclosing; if (enclosing) enclosing->callSuper |= callSuper; if (!nofree) { enclosing = freelist; freelist = this; flags |= SCOPEfree; } return enc; } void Scope::mergeCallSuper(Loc loc, unsigned cs) { // This does a primitive flow analysis to support the restrictions // regarding when and how constructors can appear. // It merges the results of two paths. // The two paths are callSuper and cs; the result is merged into callSuper. if (cs != callSuper) { int a; int b; callSuper |= cs & (CSXany_ctor | CSXlabel); if (cs & CSXreturn) { } else if (callSuper & CSXreturn) { callSuper = cs | (callSuper & (CSXany_ctor | CSXlabel)); } else { a = (cs & (CSXthis_ctor | CSXsuper_ctor)) != 0; b = (callSuper & (CSXthis_ctor | CSXsuper_ctor)) != 0; if (a != b) error(loc, "one path skips constructor"); callSuper |= cs; } } } Dsymbol *Scope::search(Loc loc, Identifier *ident, Dsymbol **pscopesym) { Dsymbol *s; Scope *sc; //printf("Scope::search(%p, '%s')\n", this, ident->toChars()); if (ident == Id::empty) { // Look for module scope for (sc = this; sc; sc = sc->enclosing) { assert(sc != sc->enclosing); if (sc->scopesym) { s = sc->scopesym->isModule(); if (s) { //printf("\tfound %s.%s\n", s->parent ? s->parent->toChars() : "", s->toChars()); if (pscopesym) *pscopesym = sc->scopesym; return s; } } } return NULL; } for (sc = this; sc; sc = sc->enclosing) { assert(sc != sc->enclosing); if (sc->scopesym) { //printf("\tlooking in scopesym '%s', kind = '%s'\n", sc->scopesym->toChars(), sc->scopesym->kind()); s = sc->scopesym->search(loc, ident, 0); if (s) { if ((global.params.warnings || global.params.Dversion > 1) && ident == Id::length && sc->scopesym->isArrayScopeSymbol() && sc->enclosing && sc->enclosing->search(loc, ident, NULL)) { warning(s->loc, "array 'length' hides other 'length' name in outer scope"); } //printf("\tfound %s.%s, kind = '%s'\n", s->parent ? s->parent->toChars() : "", s->toChars(), s->kind()); if (pscopesym) *pscopesym = sc->scopesym; return s; } } } return NULL; } Dsymbol *Scope::insert(Dsymbol *s) { Scope *sc; for (sc = this; sc; sc = sc->enclosing) { //printf("\tsc = %p\n", sc); if (sc->scopesym) { //printf("\t\tsc->scopesym = %p\n", sc->scopesym); if (!sc->scopesym->symtab) sc->scopesym->symtab = new DsymbolTable(); return sc->scopesym->symtab->insert(s); } } assert(0); return NULL; } /******************************************** * Search enclosing scopes for ClassDeclaration. */ ClassDeclaration *Scope::getClassScope() { Scope *sc; for (sc = this; sc; sc = sc->enclosing) { ClassDeclaration *cd; if (sc->scopesym) { cd = sc->scopesym->isClassDeclaration(); if (cd) return cd; } } return NULL; } /******************************************** * Search enclosing scopes for ClassDeclaration. */ AggregateDeclaration *Scope::getStructClassScope() { Scope *sc; for (sc = this; sc; sc = sc->enclosing) { AggregateDeclaration *ad; if (sc->scopesym) { ad = sc->scopesym->isClassDeclaration(); if (ad) return ad; else { ad = sc->scopesym->isStructDeclaration(); if (ad) return ad; } } } return NULL; } /******************************************* * For TemplateDeclarations, we need to remember the Scope * where it was declared. So mark the Scope as not * to be free'd. */ void Scope::setNoFree() { Scope *sc; //int i = 0; //printf("Scope::setNoFree(this = %p)\n", this); for (sc = this; sc; sc = sc->enclosing) { //printf("\tsc = %p\n", sc); sc->nofree = 1; assert(!(flags & SCOPEfree)); //assert(sc != sc->enclosing); //assert(!sc->enclosing || sc != sc->enclosing->enclosing); //if (++i == 10) //assert(0); } }