Mercurial > projects > ldc
view dmd2/scope.c @ 1047:6bb04dbee21f
Some calling convention work for x86-64:
- Implement x86-64 extern(C), hopefully correctly.
- Tried to be a bit smarter about extern(D) while I was there.
Interestingly, this code seems to be generating more efficient code than
gcc and llvm-gcc in some edge cases, like returning a `{ [7 x i8] }` loaded from
a stack slot from an extern(C) function. (gcc generates 7 1-byte loads, while
this code generates a 4-byte, a 2-byte and a 1-byte load)
I also added some changes to make sure structs being returned from functions or
passed in as parameters are stored in memory where the rest of the backend seems
to expect them to be. These should be removed when support for first-class
aggregates improves.
author | Frits van Bommel <fvbommel wxs.nl> |
---|---|
date | Fri, 06 Mar 2009 16:00:47 +0100 |
parents | f04dde6e882c |
children | 638d16625da2 |
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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->tf = NULL; this->tfOfTry = 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->tf = enclosing->tf; this->tfOfTry = enclosing->tfOfTry; 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)) { // WTF ? if (global.params.warnings) fprintf(stdmsg, "warning - "); error(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); } }