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view tests/mini/naked_asm5.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 | e92e14690a4f |
children |
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line source
int foo(int op)(int a, int b) { version(X86) { const OP = (op == '+') ? "add" : "sub"; version (Windows) { asm { naked; } mixin("asm{push EBP;mov EBP,ESP;sub ESP,8;mov ECX,[EBP+8];"~OP~" EAX, ECX;add ESP,8;pop EBP;}"); asm { ret; } } else { asm { naked; } mixin("asm{"~OP~" EAX, [ESP+4];}"); asm { ret 4; } } } else version(X86_64) { const OP = (op == '+') ? "add" : "sub"; asm { naked; } mixin("asm{"~OP~" ESI,EDI; mov EAX, ESI;}"); asm { ret; } } else static assert(0, "todo"); } void main() { int i = foo!('+')(2, 4); assert(i == 6); i = foo!('-')(2, 4); assert(i == 2); }