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view tests/mini/asm7.d @ 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 | 12b423e17860 |
children |
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module tangotests.asm7; // test massive label collisions (runtime uses Loverflow too) extern(C) int printf(char*, ...); void main() { int a = add(1,2); int s = sub(1,2); assert(a == 3); assert(s == -1); } int add(int a, int b) { int res; version (D_InlineAsm_X86) { asm { mov EAX, a; add EAX, b; jo Loverflow; mov res, EAX; } } else version (D_InlineAsm_X86_64) { asm { mov EAX, a; add EAX, b; jo Loverflow; mov res, EAX; } } printf("%d\n",res); return res; Loverflow: assert(0, "add overflow"); } int sub(int a, int b) { int res; version (D_InlineAsm_X86) { asm { mov EAX, a; sub EAX, b; jo Loverflow; mov res, EAX; } } else version (D_InlineAsm_X86_64) { asm { mov EAX, a; sub EAX, b; jo Loverflow; mov res, EAX; } } printf("%d\n",res); return res; Loverflow: assert(0, "sub overflow"); int x; }