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view dmd2/aliasthis.c @ 1499:df11cdec45a2
Another shot at fixing the issues with (constant) struct literals and their addresses. See DMD2682, #218, #324.
The idea is to separate the notion of const from 'this variable can always be
replaced with its initializer' in the frontend. To do that, I introduced
Declaration::isSameAsInitializer, which is overridden in VarDeclaration to
return false for constants that have a struct literal initializer.
So
{{{
const S s = S(5);
void foo() { auto ps = &s; }
// is no longer replaced by
void foo() { auto ps = &(S(5)); }
}}}
To make taking the address of a struct constant with a struct-initializer
outside of function scope possible, I made sure that AddrExp::optimize doesn't
try to run the argument's optimization with WANTinterpret - that'd again
replace the constant with a struct literal temporary.
author | Christian Kamm <kamm incasoftware de> |
---|---|
date | Sun, 14 Jun 2009 19:49:58 +0200 |
parents | 638d16625da2 |
children |
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// Compiler implementation of the D programming language // Copyright (c) 2009-2009 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 "mars.h" #include "identifier.h" #include "aliasthis.h" #include "scope.h" #include "aggregate.h" #include "dsymbol.h" #if DMDV2 AliasThis::AliasThis(Loc loc, Identifier *ident) : Dsymbol(NULL) // it's anonymous (no identifier) { this->loc = loc; this->ident = ident; } Dsymbol *AliasThis::syntaxCopy(Dsymbol *s) { assert(!s); /* Since there is no semantic information stored here, * we don't need to copy it. */ return this; } void AliasThis::semantic(Scope *sc) { Dsymbol *parent = sc->parent; if (parent) parent = parent->pastMixin(); AggregateDeclaration *ad = NULL; if (parent) ad = parent->isAggregateDeclaration(); if (ad) { if (ad->aliasthis) error("there can be only one alias this"); assert(ad->members); Dsymbol *s = ad->search(loc, ident, 0); ad->aliasthis = s; } else error("alias this can only appear in struct or class declaration, not %s", parent ? parent->toChars() : "nowhere"); } const char *AliasThis::kind() { return "alias this"; } void AliasThis::toCBuffer(OutBuffer *buf, HdrGenState *hgs) { buf->writestring("alias "); buf->writestring(ident->toChars()); buf->writestring(" this;\n"); } #endif