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comparison tests/mini/conststructliteral.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> |
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date | Sun, 14 Jun 2009 19:49:58 +0200 |
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1498:899a928ac905 | 1499:df11cdec45a2 |
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1 struct S { int i; } | |
2 | |
3 const S s1; | |
4 static this() { s1 = S(5); } | |
5 const S s2 = { 5 }; | |
6 const S s3 = S(5); | |
7 S foo() { S t; t.i = 5; return t; } | |
8 const S s4 = foo(); | |
9 | |
10 const ps1 = &s1; | |
11 const ps2 = &s2; | |
12 //const ps3 = &s3; // these could be made to work | |
13 //const ps4 = &s4; | |
14 | |
15 extern(C) int printf(char*,...); | |
16 void main() { | |
17 printf("%p %p\n", ps1, ps2); | |
18 printf("%p %p %p %p\n", &s1, &s2, &s3, &s4); | |
19 | |
20 assert(ps1 == ps1); | |
21 assert(ps2 == ps2); | |
22 assert(&s1 == &s1); | |
23 assert(&s2 == &s2); | |
24 assert(&s3 == &s3); | |
25 assert(&s4 == &s4); | |
26 } | |
27 |