http://llvm.org/bugs/show_bug.cgi?id=12785
Bug #: 12785
Summary: [Windows] thiscall is not handled correctly
Product: clang
Version: trunk
Platform: PC
OS/Version: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: C++
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Repro as of r155981:
=========================
#include <stdio.h>
class C {
public:
void foo() { printf("%d\n", a); }
private:
int a;
};
int main() {
C c;
c.foo();
}
=========================
$ clang++ -Xclang -cxx-abi -Xclang microsoft thiscall.cpp -S
$ vim thiscall.s
...
...
_main: # @main
# BB#0: # %entry
pushl %ebp
movl %esp, %ebp
andl $-8, %esp
subl $16, %esp
leal 8(%esp), %eax
movl %eax, (%esp)
calll "?foo@C@@QAEXXZ"
...
As you can see, 'this' is pushed on top of the stack.
Should be: put into ECX.
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