forked from OSchip/llvm-project
61 lines
1.2 KiB
C++
61 lines
1.2 KiB
C++
// RUN: %clangxx_cfi_diag -o %t %s
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// RUN: %run %t 2>&1 | FileCheck %s
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// This test checks that we don't generate two type checks,
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// if two virtual calls are in the same function.
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// UNSUPPORTED: win32
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// REQUIRES: cxxabi
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// TODO(krasin): implement the optimization to not emit two type checks.
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// XFAIL: *
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#include <stdio.h>
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class Base {
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public:
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virtual void Foo() {
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fprintf(stderr, "Base::Foo\n");
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}
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virtual void Bar() {
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fprintf(stderr, "Base::Bar\n");
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}
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};
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class Derived : public Base {
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public:
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void Foo() override {
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fprintf(stderr, "Derived::Foo\n");
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}
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void Bar() override {
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printf("Derived::Bar\n");
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}
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};
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__attribute__((noinline)) void print(Base* ptr) {
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ptr->Foo();
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// Corrupt the vtable pointer. We expect that the optimization will
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// check vtable before the first vcall then store it in a local
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// variable, and reuse it for the second vcall. With no optimization,
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// CFI will complain about the virtual table being corrupted.
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*reinterpret_cast<void**>(ptr) = 0;
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ptr->Bar();
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}
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int main() {
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Base b;
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Derived d;
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// CHECK: Base::Foo
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// CHECK: Base::Bar
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print(&b);
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// CHECK: Derived::Foo
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// CHECK-NOT: runtime error
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// CHECK: Derived::Bar
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print(&d);
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return 0;
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}
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