mirror of
https://github.com/xomboverlord/ldc.git
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[svn r5] Initial commit. Most things are very rough.
This commit is contained in:
Tomas Lindquist Olsen
488
dmd/struct.c
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488
dmd/struct.c
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@@ -0,0 +1,488 @@
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// Compiler implementation of the D programming language
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// Copyright (c) 1999-2006 by Digital Mars
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// All Rights Reserved
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// written by Walter Bright
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// http://www.digitalmars.com
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// License for redistribution is by either the Artistic License
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// in artistic.txt, or the GNU General Public License in gnu.txt.
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// See the included readme.txt for details.
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#include <stdio.h>
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#include <assert.h>
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#include "root.h"
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#include "aggregate.h"
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#include "scope.h"
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#include "mtype.h"
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#include "declaration.h"
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#include "module.h"
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#include "id.h"
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#include "statement.h"
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/********************************* AggregateDeclaration ****************************/
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AggregateDeclaration::AggregateDeclaration(Loc loc, Identifier *id)
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: ScopeDsymbol(id)
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{
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this->loc = loc;
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storage_class = 0;
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protection = PROTpublic;
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type = NULL;
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handle = NULL;
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structsize = 0; // size of struct
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alignsize = 0; // size of struct for alignment purposes
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structalign = 0; // struct member alignment in effect
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hasUnions = 0;
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sizeok = 0; // size not determined yet
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isdeprecated = 0;
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inv = NULL;
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aggNew = NULL;
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aggDelete = NULL;
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stag = NULL;
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sinit = NULL;
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scope = NULL;
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llvmType = NULL;
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llvmVtbl = NULL;
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llvmInitZ = NULL;
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llvmInProgress = false;
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}
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enum PROT AggregateDeclaration::prot()
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{
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return protection;
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}
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void AggregateDeclaration::semantic2(Scope *sc)
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{
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//printf("AggregateDeclaration::semantic2(%s)\n", toChars());
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if (scope)
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{ error("has forward references");
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return;
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}
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if (members)
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{
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sc = sc->push(this);
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for (size_t i = 0; i < members->dim; i++)
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{
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Dsymbol *s = (Dsymbol *)members->data[i];
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s->semantic2(sc);
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}
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sc->pop();
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}
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}
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void AggregateDeclaration::semantic3(Scope *sc)
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{ int i;
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//printf("AggregateDeclaration::semantic3(%s)\n", toChars());
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if (members)
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{
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sc = sc->push(this);
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for (i = 0; i < members->dim; i++)
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{
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Dsymbol *s = (Dsymbol *)members->data[i];
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s->semantic3(sc);
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}
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sc->pop();
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}
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}
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void AggregateDeclaration::inlineScan()
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{ int i;
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//printf("AggregateDeclaration::inlineScan(%s)\n", toChars());
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if (members)
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{
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for (i = 0; i < members->dim; i++)
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{
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Dsymbol *s = (Dsymbol *)members->data[i];
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//printf("inline scan aggregate symbol '%s'\n", s->toChars());
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s->inlineScan();
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}
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}
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}
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unsigned AggregateDeclaration::size(Loc loc)
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{
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//printf("AggregateDeclaration::size() = %d\n", structsize);
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if (!members)
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error(loc, "unknown size");
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if (sizeok != 1)
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{ error(loc, "no size yet for forward reference");
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//*(char*)0=0;
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}
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return structsize;
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}
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Type *AggregateDeclaration::getType()
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{
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return type;
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}
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int AggregateDeclaration::isDeprecated()
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{
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return isdeprecated;
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}
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/****************************
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* Do byte or word alignment as necessary.
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* Align sizes of 0, as we may not know array sizes yet.
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*/
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void AggregateDeclaration::alignmember(unsigned salign, unsigned size, unsigned *poffset)
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{
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//printf("salign = %d, size = %d, offset = %d\n",salign,size,offset);
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if (salign > 1)
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{ int sa;
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switch (size)
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{ case 1:
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break;
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case 2:
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case_2:
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*poffset = (*poffset + 1) & ~1; // align to word
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break;
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case 3:
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case 4:
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if (salign == 2)
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goto case_2;
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*poffset = (*poffset + 3) & ~3; // align to dword
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break;
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default:
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*poffset = (*poffset + salign - 1) & ~(salign - 1);
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break;
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}
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}
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//printf("result = %d\n",offset);
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}
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void AggregateDeclaration::addField(Scope *sc, VarDeclaration *v)
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{
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unsigned memsize; // size of member
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unsigned memalignsize; // size of member for alignment purposes
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unsigned xalign; // alignment boundaries
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//printf("AggregateDeclaration::addField('%s') %s\n", v->toChars(), toChars());
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// Check for forward referenced types which will fail the size() call
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Type *t = v->type->toBasetype();
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if (t->ty == Tstruct /*&& isStructDeclaration()*/)
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{ TypeStruct *ts = (TypeStruct *)t;
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if (ts->sym->sizeok != 1)
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{
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sizeok = 2; // cannot finish; flag as forward referenced
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return;
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}
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}
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if (t->ty == Tident)
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{
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sizeok = 2; // cannot finish; flag as forward referenced
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return;
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}
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memsize = v->type->size(loc);
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memalignsize = v->type->alignsize();
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xalign = v->type->memalign(sc->structalign);
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alignmember(xalign, memalignsize, &sc->offset);
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v->offset = sc->offset;
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sc->offset += memsize;
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if (sc->offset > structsize)
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structsize = sc->offset;
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if (sc->structalign < memalignsize)
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memalignsize = sc->structalign;
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if (alignsize < memalignsize)
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alignsize = memalignsize;
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//printf("\talignsize = %d\n", alignsize);
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v->storage_class |= STCfield;
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//printf(" addField '%s' to '%s' at offset %d, size = %d\n", v->toChars(), toChars(), v->offset, memsize);
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fields.push(v);
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}
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/********************************* StructDeclaration ****************************/
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StructDeclaration::StructDeclaration(Loc loc, Identifier *id)
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: AggregateDeclaration(loc, id)
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{
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zeroInit = 0; // assume false until we do semantic processing
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// For forward references
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type = new TypeStruct(this);
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}
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Dsymbol *StructDeclaration::syntaxCopy(Dsymbol *s)
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{
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StructDeclaration *sd;
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if (s)
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sd = (StructDeclaration *)s;
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else
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sd = new StructDeclaration(loc, ident);
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ScopeDsymbol::syntaxCopy(sd);
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return sd;
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}
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void StructDeclaration::semantic(Scope *sc)
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{ int i;
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Scope *sc2;
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//printf("+StructDeclaration::semantic(this=%p, '%s')\n", this, toChars());
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//static int count; if (++count == 20) *(char*)0=0;
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assert(type);
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if (!members) // if forward reference
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return;
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if (symtab)
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{ if (!scope)
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return; // semantic() already completed
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}
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else
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symtab = new DsymbolTable();
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Scope *scx = NULL;
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if (scope)
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{ sc = scope;
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scx = scope; // save so we don't make redundant copies
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scope = NULL;
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}
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parent = sc->parent;
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handle = type->pointerTo();
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structalign = sc->structalign;
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protection = sc->protection;
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assert(!isAnonymous());
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if (sc->stc & STCabstract)
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error("structs, unions cannot be abstract");
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if (sizeok == 0) // if not already done the addMember step
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{
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for (i = 0; i < members->dim; i++)
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{
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Dsymbol *s = (Dsymbol *)members->data[i];
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//printf("adding member '%s' to '%s'\n", s->toChars(), this->toChars());
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s->addMember(sc, this, 1);
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}
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}
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sizeok = 0;
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sc2 = sc->push(this);
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sc2->stc = 0;
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sc2->parent = this;
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if (isUnionDeclaration())
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sc2->inunion = 1;
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sc2->protection = PROTpublic;
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sc2->explicitProtection = 0;
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int members_dim = members->dim;
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for (i = 0; i < members_dim; i++)
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{
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Dsymbol *s = (Dsymbol *)members->data[i];
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s->semantic(sc2);
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if (isUnionDeclaration())
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sc2->offset = 0;
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#if 0
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if (sizeok == 2)
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{ //printf("forward reference\n");
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break;
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}
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#endif
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}
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/* The TypeInfo_Struct is expecting an opEquals and opCmp with
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* a parameter that is a pointer to the struct. But if there
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* isn't one, but is an opEquals or opCmp with a value, write
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* another that is a shell around the value:
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* int opCmp(struct *p) { return opCmp(*p); }
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*/
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TypeFunction *tfeqptr;
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{
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Arguments *arguments = new Arguments;
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Argument *arg = new Argument(STCin, handle, Id::p, NULL);
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arguments->push(arg);
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tfeqptr = new TypeFunction(arguments, Type::tint32, 0, LINKd);
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tfeqptr = (TypeFunction *)tfeqptr->semantic(0, sc);
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}
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TypeFunction *tfeq;
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{
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Arguments *arguments = new Arguments;
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Argument *arg = new Argument(STCin, type, NULL, NULL);
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arguments->push(arg);
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tfeq = new TypeFunction(arguments, Type::tint32, 0, LINKd);
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tfeq = (TypeFunction *)tfeq->semantic(0, sc);
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}
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Identifier *id = Id::eq;
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for (int i = 0; i < 2; i++)
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{
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Dsymbol *s = search_function(this, id);
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FuncDeclaration *fdx = s ? s->isFuncDeclaration() : NULL;
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if (fdx)
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{ FuncDeclaration *fd = fdx->overloadExactMatch(tfeqptr);
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if (!fd)
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{ fd = fdx->overloadExactMatch(tfeq);
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if (fd)
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{ // Create the thunk, fdptr
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FuncDeclaration *fdptr = new FuncDeclaration(loc, loc, fdx->ident, STCundefined, tfeqptr);
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Expression *e = new IdentifierExp(loc, Id::p);
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e = new PtrExp(loc, e);
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Expressions *args = new Expressions();
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args->push(e);
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e = new IdentifierExp(loc, id);
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e = new CallExp(loc, e, args);
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fdptr->fbody = new ReturnStatement(loc, e);
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ScopeDsymbol *s = fdx->parent->isScopeDsymbol();
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assert(s);
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s->members->push(fdptr);
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fdptr->addMember(sc, s, 1);
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fdptr->semantic(sc2);
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}
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}
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}
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id = Id::cmp;
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}
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sc2->pop();
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if (sizeok == 2)
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{ // semantic() failed because of forward references.
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// Unwind what we did, and defer it for later
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fields.setDim(0);
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structsize = 0;
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alignsize = 0;
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structalign = 0;
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scope = scx ? scx : new Scope(*sc);
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scope->setNoFree();
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scope->module->addDeferredSemantic(this);
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//printf("\tdeferring %s\n", toChars());
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return;
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}
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// 0 sized struct's are set to 1 byte
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if (structsize == 0)
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{
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structsize = 1;
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alignsize = 1;
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}
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// Round struct size up to next alignsize boundary.
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// This will ensure that arrays of structs will get their internals
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// aligned properly.
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structsize = (structsize + alignsize - 1) & ~(alignsize - 1);
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sizeok = 1;
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Module::dprogress++;
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//printf("-StructDeclaration::semantic(this=%p, '%s')\n", this, toChars());
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// Determine if struct is all zeros or not
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zeroInit = 1;
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for (i = 0; i < fields.dim; i++)
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{
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Dsymbol *s = (Dsymbol *)fields.data[i];
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VarDeclaration *vd = s->isVarDeclaration();
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if (vd && !vd->isDataseg())
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{
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if (vd->init)
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{
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// Should examine init to see if it is really all 0's
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zeroInit = 0;
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break;
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}
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else
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{
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if (!vd->type->isZeroInit())
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{
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zeroInit = 0;
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break;
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}
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}
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}
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}
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/* Look for special member functions.
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*/
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inv = (InvariantDeclaration *)search(0, Id::classInvariant, 0);
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aggNew = (NewDeclaration *)search(0, Id::classNew, 0);
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aggDelete = (DeleteDeclaration *)search(0, Id::classDelete, 0);
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if (sc->func)
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{
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semantic2(sc);
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semantic3(sc);
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}
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}
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void StructDeclaration::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
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{ int i;
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buf->printf("%s ", kind());
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if (!isAnonymous())
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buf->writestring(toChars());
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if (!members)
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{
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buf->writeByte(';');
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buf->writenl();
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return;
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}
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buf->writenl();
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buf->writeByte('{');
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buf->writenl();
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for (i = 0; i < members->dim; i++)
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{
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Dsymbol *s = (Dsymbol *)members->data[i];
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buf->writestring(" ");
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s->toCBuffer(buf, hgs);
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}
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buf->writeByte('}');
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buf->writenl();
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}
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char *StructDeclaration::kind()
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{
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return "struct";
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}
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/********************************* UnionDeclaration ****************************/
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UnionDeclaration::UnionDeclaration(Loc loc, Identifier *id)
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: StructDeclaration(loc, id)
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{
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}
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Dsymbol *UnionDeclaration::syntaxCopy(Dsymbol *s)
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{
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UnionDeclaration *ud;
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if (s)
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ud = (UnionDeclaration *)s;
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else
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ud = new UnionDeclaration(loc, ident);
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StructDeclaration::syntaxCopy(ud);
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return ud;
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}
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char *UnionDeclaration::kind()
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{
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return "union";
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}
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