https://d.puremagic.com/issues/show_bug.cgi?id=11740
Summary: [64-bit] Struct with constructor incorrectly passed on
stack
Product: D
Version: D2
Platform: x86_64
OS/Version: All
Status: NEW
Keywords: wrong-code
Severity: critical
Priority: P2
Component: DMD
AssignedTo: nob...@puremagic.com
ReportedBy: yebbl...@gmail.com
--- Comment #0 from yebblies <yebbl...@gmail.com> 2013-12-15 04:22:12 EST ---
In func, 's' is passed on the stack instead of in a register pair, only when
the constructor is present. This blocks DDMD on linux64.
extern(C++)
class C
{
extern(C++) static void func(S s, C c)
{
assert(c);
assert(s.filename);
assert(s.linnum);
}
}
struct S
{
const(char)* filename;
uint linnum;
this(const(char)* filename, uint linnum) {}
}
int main()
{
C.func(S(null, 0), null);
return 0;
}
0000000000000000 <_ZN1C4funcE1SPS_>:
0: 55 push %rbp
1: 48 8b ec mov %rsp,%rbp
4: 48 83 ec 10 sub $0x10,%rsp
8: 48 89 7d f8 mov %rdi,-0x8(%rbp) (should be in rdx, not
rdi)
c: 48 83 7d f8 00 cmpq $0x0,-0x8(%rbp)
11: 75 0a jne 1d <_ZN1C4funcE1SPS_+0x1d>
13: bf 07 00 00 00 mov $0x7,%edi
18: e8 00 00 00 00 callq 1d <_ZN1C4funcE1SPS_+0x1d>
19: R_X86_64_PC32 _D4test8__assertFiZv-0x4
1d: 48 83 7d 10 00 cmpq $0x0,0x10(%rbp)
22: 75 0a jne 2e <_ZN1C4funcE1SPS_+0x2e>
24: bf 08 00 00 00 mov $0x8,%edi
29: e8 00 00 00 00 callq 2e <_ZN1C4funcE1SPS_+0x2e>
2a: R_X86_64_PC32 _D4test8__assertFiZv-0x4
2e: 83 7d 18 00 cmpl $0x0,0x18(%rbp)
32: 75 0a jne 3e <_ZN1C4funcE1SPS_+0x3e>
34: bf 09 00 00 00 mov $0x9,%edi
39: e8 00 00 00 00 callq 3e <_ZN1C4funcE1SPS_+0x3e>
3a: R_X86_64_PC32 _D4test8__assertFiZv-0x4
3e: c9 leaveq
3f: c3 retq
It works correctly if StructDeclaration::isPOD is changed to not reject all
structs with constructors, but there is a comment warning against that.
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