[LLVMbugs] [Bug 20315] New: MS ABI: Layout wrong for indirectly inherited packed base
bugzilla-daemon at llvm.org
bugzilla-daemon at llvm.org
Tue Jul 15 17:40:15 PDT 2014
http://llvm.org/bugs/show_bug.cgi?id=20315
Bug ID: 20315
Summary: MS ABI: Layout wrong for indirectly inherited packed
base
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangbugs at nondot.org
Reporter: david.majnemer at gmail.com
CC: llvmbugs at cs.uiuc.edu
Classification: Unclassified
consider:
extern "C" int printf(const char *, ...);
static char buffer[419430400];
inline void *operator new(size_t, void *pv) { return pv; }
struct A {};
struct B : A {};
struct C {};
#pragma pack(push, 1)
struct D : B, virtual A, virtual C {
int field;
D() {
printf("field: %d\n", (int)&field - (int)buffer);
}
};
#pragma pack(pop)
struct E : D {};
struct F : A, E {};
template <typename Class> static void init_mem() {
new (buffer) Class;
}
int main() {
init_mem<F>();
}
we give:
field: 5
they give:
field: 8
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