http://llvm.org/bugs/show_bug.cgi?id=16406
Bug ID: 16406
Summary: [-cxx-abi microsoft] Wrong layout due to mistakenly
injected vtorDisp
Product: clang
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
=== vtordisp_layout.cpp ===
class A {
virtual void f();
};
class B : virtual A {
virtual void f();
};
class C : virtual B {};
extern "C" int printf(const char *fmt, ...);
int main() {
printf("sizeof(C) = %lu\n", sizeof(C));
}
===========================
As of r184536,
$ clang -cc1 -fno-rtti -fdump-record-layouts -cxx-abi microsoft
-triple=i386-pc-win32 -emit-llvm-only -o - vtordisp_layout.cpp
prints out
*** Dumping AST Record Layout
0 | class B
0 | (B vbtable pointer)
4 | (vtordisp for vbase A)
8 | class A (virtual base)
8 | (A vftable pointer)
| [sizeof=12, dsize=12, align=4
| nvsize=4, nvalign=4]
*** Dumping AST Record Layout
0 | class C
0 | (C vbtable pointer)
4 | (vtordisp for vbase A)
8 | class A (virtual base)
8 | (A vftable pointer)
12 | class B (virtual base)
12 | (B vbtable pointer)
| [sizeof=16, dsize=16, align=4
| nvsize=4, nvalign=4]
There should not be vtordisp in B, nor should it be in C.
sizeof(B) should be 8, sizeof(C) should be 12.
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