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view dmd/root/lstring.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 | 1853dcd9b944 |
children |
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// lstring.c // Copyright (c) 1999-2002 by Digital Mars // All Rights Reserved // written by Walter Bright // 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 <stdlib.h> #include "dchar.h" #include "rmem.h" #include "lstring.h" #ifdef _MSC_VER // prevent compiler internal crash Lstring Lstring::zero; #else Lstring Lstring::zero = LSTRING_EMPTY(); #endif Lstring *Lstring::ctor(const dchar *p, unsigned length) { Lstring *s; s = alloc(length); memcpy(s->string, p, length * sizeof(dchar)); return s; } Lstring *Lstring::alloc(unsigned length) { Lstring *s; s = (Lstring *)mem.malloc(size(length)); s->length = length; s->string[length] = 0; return s; } Lstring *Lstring::append(const Lstring *s) { Lstring *t; if (!s->length) return this; t = alloc(length + s->length); memcpy(t->string, string, length * sizeof(dchar)); memcpy(t->string + length, s->string, s->length * sizeof(dchar)); return t; } Lstring *Lstring::substring(int start, int end) { Lstring *t; if (start == end) return &zero; t = alloc(end - start); memcpy(t->string, string + start, (end - start) * sizeof(dchar)); return t; }