http://llvm.org/bugs/show_bug.cgi?id=20444
Bug ID: 20444
Summary: VFTable larger than needed for multiple inheritance
hierarchy
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangb...@nondot.org
Reporter: david.majne...@gmail.com
CC: llvmbugs@cs.uiuc.edu
Classification: Unclassified
struct A {
virtual A *f() { return 0; }
};
struct B {
virtual B *f() { return 0; }
};
struct C : A, B {
virtual C *f() { return 0; }
};
A a;
B b;
C c;
B *get_c() { return &c; }
int main() {
get_c()->f();
}
We generate the following:
"??_7C@@6BA@@@":
.long "?f@C@@UAEPAU1@XZ"
.long "?f@C@@UAEPAU1@XZ"
Note that the VFTable has the same entry twice in it. This can be very
problematic if we have RTTI because the largest VFTable might not get picked.
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