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view dmd/struct.c @ 1351:8d501abecd24
Initial (but disabled) fix for ticket #294 , the actual part that fixes the bug is in a #if 0 block as I'm afraid it will cause regressions. I'm most likely not going to be around tonight, and maybe not tomorrow as well, so I'm pushing it in case someone wants to run some serious testing/investigate the problem noted in llvmhelpers.cpp : realignOffset .
author | Tomas Lindquist Olsen <tomas.l.olsen gmail com> |
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date | Thu, 14 May 2009 17:20:17 +0200 |
parents | e961851fb8be |
children | 78038e540342 |
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// Compiler implementation of the D programming language // Copyright (c) 1999-2009 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 "aggregate.h" #include "scope.h" #include "mtype.h" #include "declaration.h" #include "module.h" #include "id.h" #include "statement.h" /********************************* AggregateDeclaration ****************************/ AggregateDeclaration::AggregateDeclaration(Loc loc, Identifier *id) : ScopeDsymbol(id) { this->loc = loc; storage_class = 0; protection = PROTpublic; type = NULL; handle = NULL; structsize = 0; // size of struct alignsize = 0; // size of struct for alignment purposes structalign = 0; // struct member alignment in effect hasUnions = 0; sizeok = 0; // size not determined yet isdeprecated = 0; inv = NULL; aggNew = NULL; aggDelete = NULL; #if IN_DMD stag = NULL; sinit = NULL; #endif scope = NULL; #if DMDV2 dtor = NULL; ctor = NULL; defaultCtor = NULL; #endif } enum PROT AggregateDeclaration::prot() { return protection; } void AggregateDeclaration::semantic2(Scope *sc) { //printf("AggregateDeclaration::semantic2(%s)\n", toChars()); if (scope) { error("has forward references"); return; } if (members) { sc = sc->push(this); for (size_t i = 0; i < members->dim; i++) { Dsymbol *s = (Dsymbol *)members->data[i]; s->semantic2(sc); } sc->pop(); } } void AggregateDeclaration::semantic3(Scope *sc) { int i; //printf("AggregateDeclaration::semantic3(%s)\n", toChars()); if (members) { sc = sc->push(this); for (i = 0; i < members->dim; i++) { Dsymbol *s = (Dsymbol *)members->data[i]; s->semantic3(sc); } sc->pop(); } } void AggregateDeclaration::inlineScan() { int i; //printf("AggregateDeclaration::inlineScan(%s)\n", toChars()); if (members) { for (i = 0; i < members->dim; i++) { Dsymbol *s = (Dsymbol *)members->data[i]; //printf("inline scan aggregate symbol '%s'\n", s->toChars()); s->inlineScan(); } } } unsigned AggregateDeclaration::size(Loc loc) { //printf("AggregateDeclaration::size() = %d\n", structsize); if (!members) error(loc, "unknown size"); if (sizeok != 1) { error(loc, "no size yet for forward reference"); //*(char*)0=0; } return structsize; } Type *AggregateDeclaration::getType() { return type; } int AggregateDeclaration::isDeprecated() { return isdeprecated; } /**************************** * Do byte or word alignment as necessary. * Align sizes of 0, as we may not know array sizes yet. */ void AggregateDeclaration::alignmember( unsigned salign, // struct alignment that is in effect unsigned size, // alignment requirement of field unsigned *poffset) { //printf("salign = %d, size = %d, offset = %d\n",salign,size,offset); if (salign > 1) { assert(size != 3); int sa = size; if (sa == 0 || salign < sa) sa = salign; *poffset = (*poffset + sa - 1) & ~(sa - 1); } //printf("result = %d\n",offset); } void AggregateDeclaration::addField(Scope *sc, VarDeclaration *v) { unsigned memsize; // size of member unsigned memalignsize; // size of member for alignment purposes unsigned xalign; // alignment boundaries //printf("AggregateDeclaration::addField('%s') %s\n", v->toChars(), toChars()); // Check for forward referenced types which will fail the size() call Type *t = v->type->toBasetype(); if (t->ty == Tstruct /*&& isStructDeclaration()*/) { TypeStruct *ts = (TypeStruct *)t; #if DMDV2 if (ts->sym == this) { error("cannot have field %s with same struct type", v->toChars()); } #endif if (ts->sym->sizeok != 1) { sizeok = 2; // cannot finish; flag as forward referenced return; } } if (t->ty == Tident) { sizeok = 2; // cannot finish; flag as forward referenced return; } memsize = v->type->size(loc); memalignsize = v->type->alignsize(); xalign = v->type->memalign(sc->structalign); alignmember(xalign, memalignsize, &sc->offset); v->offset = sc->offset; sc->offset += memsize; if (sc->offset > structsize) structsize = sc->offset; if (sc->structalign < memalignsize) memalignsize = sc->structalign; if (alignsize < memalignsize) alignsize = memalignsize; //printf("\talignsize = %d\n", alignsize); v->storage_class |= STCfield; //printf(" addField '%s' to '%s' at offset %d, size = %d\n", v->toChars(), toChars(), v->offset, memsize); fields.push(v); } /********************************* StructDeclaration ****************************/ StructDeclaration::StructDeclaration(Loc loc, Identifier *id) : AggregateDeclaration(loc, id) { zeroInit = 0; // assume false until we do semantic processing #if DMDV2 hasIdentityAssign = 0; cpctor = NULL; postblit = NULL; #endif // For forward references type = new TypeStruct(this); } Dsymbol *StructDeclaration::syntaxCopy(Dsymbol *s) { StructDeclaration *sd; if (s) sd = (StructDeclaration *)s; else sd = new StructDeclaration(loc, ident); ScopeDsymbol::syntaxCopy(sd); return sd; } void StructDeclaration::semantic(Scope *sc) { int i; Scope *sc2; //printf("+StructDeclaration::semantic(this=%p, '%s')\n", this, toChars()); //static int count; if (++count == 20) *(char*)0=0; assert(type); if (!members) // if forward reference return; if (symtab) { if (!scope) return; // semantic() already completed } else symtab = new DsymbolTable(); Scope *scx = NULL; if (scope) { sc = scope; scx = scope; // save so we don't make redundant copies scope = NULL; } parent = sc->parent; #if STRUCTTHISREF handle = type; #else handle = type->pointerTo(); #endif structalign = sc->structalign; protection = sc->protection; if (sc->stc & STCdeprecated) isdeprecated = 1; assert(!isAnonymous()); if (sc->stc & STCabstract) error("structs, unions cannot be abstract"); #if DMDV2 if (storage_class & STCinvariant) type = type->invariantOf(); else if (storage_class & STCconst) type = type->constOf(); #endif if (sizeok == 0) // if not already done the addMember step { for (i = 0; i < members->dim; i++) { Dsymbol *s = (Dsymbol *)members->data[i]; //printf("adding member '%s' to '%s'\n", s->toChars(), this->toChars()); s->addMember(sc, this, 1); } } sizeok = 0; sc2 = sc->push(this); sc2->stc = 0; sc2->parent = this; if (isUnionDeclaration()) sc2->inunion = 1; sc2->protection = PROTpublic; sc2->explicitProtection = 0; int members_dim = members->dim; for (i = 0; i < members_dim; i++) { Dsymbol *s = (Dsymbol *)members->data[i]; s->semantic(sc2); if (isUnionDeclaration()) sc2->offset = 0; #if 0 if (sizeok == 2) { //printf("forward reference\n"); break; } #endif } /* The TypeInfo_Struct is expecting an opEquals and opCmp with * a parameter that is a pointer to the struct. But if there * isn't one, but is an opEquals or opCmp with a value, write * another that is a shell around the value: * int opCmp(struct *p) { return opCmp(*p); } */ TypeFunction *tfeqptr; { Arguments *arguments = new Arguments; Argument *arg = new Argument(STCin, handle, Id::p, NULL); arguments->push(arg); tfeqptr = new TypeFunction(arguments, Type::tint32, 0, LINKd); tfeqptr = (TypeFunction *)tfeqptr->semantic(0, sc); } TypeFunction *tfeq; { Arguments *arguments = new Arguments; Argument *arg = new Argument(STCin, type, NULL, NULL); arguments->push(arg); tfeq = new TypeFunction(arguments, Type::tint32, 0, LINKd); tfeq = (TypeFunction *)tfeq->semantic(0, sc); } Identifier *id = Id::eq; for (int i = 0; i < 2; i++) { Dsymbol *s = search_function(this, id); FuncDeclaration *fdx = s ? s->isFuncDeclaration() : NULL; if (fdx) { FuncDeclaration *fd = fdx->overloadExactMatch(tfeqptr); if (!fd) { fd = fdx->overloadExactMatch(tfeq); if (fd) { // Create the thunk, fdptr FuncDeclaration *fdptr = new FuncDeclaration(loc, loc, fdx->ident, STCundefined, tfeqptr); Expression *e = new IdentifierExp(loc, Id::p); e = new PtrExp(loc, e); Expressions *args = new Expressions(); args->push(e); e = new IdentifierExp(loc, id); e = new CallExp(loc, e, args); fdptr->fbody = new ReturnStatement(loc, e); ScopeDsymbol *s = fdx->parent->isScopeDsymbol(); assert(s); s->members->push(fdptr); fdptr->addMember(sc, s, 1); fdptr->semantic(sc2); } } } id = Id::cmp; } #if DMDV2 dtor = buildDtor(sc2); postblit = buildPostBlit(sc2); cpctor = buildCpCtor(sc2); buildOpAssign(sc2); #endif sc2->pop(); if (sizeok == 2) { // semantic() failed because of forward references. // Unwind what we did, and defer it for later fields.setDim(0); structsize = 0; alignsize = 0; structalign = 0; scope = scx ? scx : new Scope(*sc); scope->setNoFree(); scope->module->addDeferredSemantic(this); //printf("\tdeferring %s\n", toChars()); return; } // 0 sized struct's are set to 1 byte if (structsize == 0) { structsize = 1; alignsize = 1; } // Round struct size up to next alignsize boundary. // This will ensure that arrays of structs will get their internals // aligned properly. structsize = (structsize + alignsize - 1) & ~(alignsize - 1); sizeok = 1; Module::dprogress++; //printf("-StructDeclaration::semantic(this=%p, '%s')\n", this, toChars()); // Determine if struct is all zeros or not zeroInit = 1; for (i = 0; i < fields.dim; i++) { Dsymbol *s = (Dsymbol *)fields.data[i]; VarDeclaration *vd = s->isVarDeclaration(); if (vd && !vd->isDataseg()) { if (vd->init) { // Should examine init to see if it is really all 0's zeroInit = 0; break; } else { if (!vd->type->isZeroInit()) { zeroInit = 0; break; } } } } /* Look for special member functions. */ #if DMDV2 ctor = (CtorDeclaration *)search(0, Id::ctor, 0); #endif inv = (InvariantDeclaration *)search(0, Id::classInvariant, 0); aggNew = (NewDeclaration *)search(0, Id::classNew, 0); aggDelete = (DeleteDeclaration *)search(0, Id::classDelete, 0); if (sc->func) { semantic2(sc); semantic3(sc); } } void StructDeclaration::toCBuffer(OutBuffer *buf, HdrGenState *hgs) { int i; buf->printf("%s ", kind()); if (!isAnonymous()) buf->writestring(toChars()); if (!members) { buf->writeByte(';'); buf->writenl(); return; } buf->writenl(); buf->writeByte('{'); buf->writenl(); for (i = 0; i < members->dim; i++) { Dsymbol *s = (Dsymbol *)members->data[i]; buf->writestring(" "); s->toCBuffer(buf, hgs); } buf->writeByte('}'); buf->writenl(); } const char *StructDeclaration::kind() { return "struct"; } /********************************* UnionDeclaration ****************************/ UnionDeclaration::UnionDeclaration(Loc loc, Identifier *id) : StructDeclaration(loc, id) { } Dsymbol *UnionDeclaration::syntaxCopy(Dsymbol *s) { UnionDeclaration *ud; if (s) ud = (UnionDeclaration *)s; else ud = new UnionDeclaration(loc, ident); StructDeclaration::syntaxCopy(ud); return ud; } const char *UnionDeclaration::kind() { return "union"; }