http://d.puremagic.com/issues/show_bug.cgi?id=4397
Summary: D1 const does not work
Product: D
Version: D1 & D2
Platform: Other
OS/Version: All
Status: NEW
Keywords: wrong-code
Severity: regression
Priority: P1
Component: DMD
AssignedTo: [email protected]
ReportedBy: [email protected]
--- Comment #0 from [email protected] 2010-06-27 10:30:32 PDT ---
In the following example, foo() will create an array literal on each call,
instead of returning a statically shared / compile time value. On D2, the same
may happen when using enum instead of const (I didn't test it).
In many cases, this codegen bug may go unnoticed, which makes it just worse.
$ cat rtz.d
struct X {
int[] a;
}
const cX = X([1,2]);
X foo() {
return cX;
}
$ dmd -c rtz.d
$ objdump -d -Mintel rtz.o -r
...
00000000 <_D3rtz3fooFZS3rtz1X>:
0: 55 push ebp
1: 8b ec mov ebp,esp
3: 83 ec 08 sub esp,0x8
6: 53 push ebx
7: 6a 02 push 0x2
9: 6a 01 push 0x1
b: 6a 02 push 0x2
d: b8 00 00 00 00 mov eax,0x0
e: R_386_32 _D11TypeInfo_Ai6__initZ
12: 50 push eax
13: e8 fc ff ff ff call 14 <_D3rtz3fooFZS3rtz1X+0x14>
14: R_386_PC32 _d_arrayliteralT
18: 89 c1 mov ecx,eax
1a: bb 02 00 00 00 mov ebx,0x2
1f: 89 5d f8 mov DWORD PTR [ebp-0x8],ebx
22: 89 4d fc mov DWORD PTR [ebp-0x4],ecx
25: 8b 55 fc mov edx,DWORD PTR [ebp-0x4]
28: 8b 45 f8 mov eax,DWORD PTR [ebp-0x8]
2b: 83 c4 10 add esp,0x10
2e: 5b pop ebx
2f: c9 leave
30: c3 ret
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