http://d.puremagic.com/issues/show_bug.cgi?id=3421
Summary: Inline assembler problems accessing static variables
Product: D
Version: 2.035
Platform: x86
OS/Version: Windows
Status: NEW
Severity: normal
Priority: P2
Component: DMD
AssignedTo: nob...@puremagic.com
ReportedBy: grahamc00...@yahoo.co.uk
--- Comment #0 from Graham <grahamc00...@yahoo.co.uk> 2009-10-19 08:03:19 PDT
---
This code works in DMD v1.047 and fails in DMD v2.035
import std.stdio;
static int value1;
void main() {
value1 = 2;
asm {
mov EAX,1;
mov [value1],EAX;
}
writefln("value1 %d", value1);
}
The code generated in each case is:
Compiled under DMD v 1.047:
> u __Dmain l39
TEST03!__Dmain+0x0:
0x00402010 55 push ebp
0x00402011 8bec mov ebp,esp
0x00402013 c705801445000200
0000 mov dword ptr [_D6test036value1i
(00451480)],00000002
0x0040201d b801000000 mov eax,00000001
0x00402022 a380144500 mov dword ptr [_D6test036value1i
(00451480)],eax
0x00402027 ff3580144500 push dword ptr [_D6test036value1i
(00451480)]
0x0040202d ff3594b04400 push dword ptr [_TMP0+00000004 (0044b094)]
0x00402033 ff3590b04400 push dword ptr [_TMP0 (0044b090)]
0x00402039 b8f0b04400 mov eax,0044b0f0
0x0040203e 50 push eax
0x0040203f e830170000 call _D3std5stdio8writeflnFYv (00403774)
0x00402044 83c410 add esp,10
0x00402047 5d pop ebp
0x00402048 c3 retn
>
Compiled under DMD v 2.0035:
> u __Dmain l43
TEST03!__Dmain+0x0:
0x00402010 55 push ebp
0x00402011 8bec mov ebp,esp
0x00402013 53 push ebx
0x00402014 64a12c000000 mov eax,dword ptr fs:[0000002c]
0x0040201a 8b08 mov ecx,dword ptr [eax]
0x0040201c c781040000000200
0000 mov dword ptr [ecx+00000004],00000002
0x00402026 b801000000 mov eax,00000001
0x0040202b a304000000 mov dword ptr [00000004],eax
0x00402030 ff3594904200 push dword ptr [_TMP0+00000004 (00429094)]
0x00402036 ff3590904200 push dword ptr [_TMP0 (00429090)]
0x0040203c 648b152c000000 mov edx,dword ptr fs:[0000002c]
0x00402043 8b1a mov ebx,dword ptr [edx]
0x00402045 8b8304000000 mov eax,dword ptr [ebx+00000004]
0x0040204b e804000000 call
_D3std5stdio19__T8writeflnTAyaTiZ8writeflnFAyaiZv (00402054)
0x00402050 5b pop ebx
0x00402051 5d pop ebp
0x00402052 c3 retn
>
The "D" code accesses 'value1' as dword ptr [ecx+00000004] and the inline
assember as dword ptr [00000004]
Is this a change in the language runtime specification for how module static
variables are accessed or it this a bug ?
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