forked from OSchip/llvm-project
50 lines
3.2 KiB
C++
50 lines
3.2 KiB
C++
// Check that we do not emit a stub for a virtual function if it is already
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// known to be in the same linkage unit as the vtable.
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// RUN: %clang_cc1 %s -triple=aarch64-unknown-fuchsia -S -o - -emit-llvm -fexperimental-relative-c++-abi-vtables | FileCheck %s --check-prefixes=CHECK,NO-OPT
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// RUN: %clang_cc1 %s -triple=aarch64-unknown-fuchsia -S -o - -emit-llvm -fexperimental-relative-c++-abi-vtables -O3 | FileCheck %s --check-prefixes=CHECK,OPT
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// The vtable offset is relative to _ZN1A3fooEv instead of a stub. We can do
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// this since hidden functions are implicitly dso_local.
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// CHECK: @_ZTV1A.local = private unnamed_addr constant { [5 x i32] } { [5 x i32] [i32 0, i32 trunc (i64 sub (i64 ptrtoint ({ i8*, i8* }** @_ZTI1A.rtti_proxy to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [5 x i32] }, { [5 x i32] }* @_ZTV1A.local, i32 0, i32 0, i32 2) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (void (%class.A*)* @_ZN1A3fooEv to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [5 x i32] }, { [5 x i32] }* @_ZTV1A.local, i32 0, i32 0, i32 2) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (%class.A* (%class.A*)* @_ZN1AD1Ev.stub to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [5 x i32] }, { [5 x i32] }* @_ZTV1A.local, i32 0, i32 0, i32 2) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (void (%class.A*)* @_ZN1AD0Ev.stub to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [5 x i32] }, { [5 x i32] }* @_ZTV1A.local, i32 0, i32 0, i32 2) to i64)) to i32)] }, align 4
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// Despite the complete object destructor being hidden, we should still emit a
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// stub for it because it's possible, when optimizations are enabled, for the
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// dtor to be "devirtualized" into the destructor for a parent class if the
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// child class doesn't implement its own dtor. For complete destructors, we
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// always emit and use a stub.
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// @_ZTV1B = hidden unnamed_addr constant { [5 x i32] } { [5 x i32] [i32 0, i32 trunc (i64 sub (i64 ptrtoint ({ i8*, i8*, i8* }** @_ZTI1B.rtti_proxy to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [5 x i32] }, { [5 x i32] }* @_ZTV1B, i32 0, i32 0, i32 2) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (void (%class.B*)* @_ZN1B3fooEv to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [5 x i32] }, { [5 x i32] }* @_ZTV1B, i32 0, i32 0, i32 2) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (%class.B* (%class.B*)* @_ZN1BD1Ev.stub to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [5 x i32] }, { [5 x i32] }* @_ZTV1B, i32 0, i32 0, i32 2) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (void (%class.B*)* @_ZN1BD0Ev to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [5 x i32] }, { [5 x i32] }* @_ZTV1B, i32 0, i32 0, i32 2) to i64)) to i32)] }, align 4
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// CHECK: @_ZTV1A = unnamed_addr alias { [5 x i32] }, { [5 x i32] }* @_ZTV1A.local
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// CHECK: @_ZN1A3fooEv
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// CHECK-NOT: @_ZN1A3fooEv.stub
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// The complete object destructor is hidden.
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// NO-OPT: define linkonce_odr hidden %class.B* @_ZN1BD1Ev
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// OPT-NOT: @_ZN1BD1Ev
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// CHECK: @_ZN1BD1Ev.stub
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#define HIDDEN __attribute__((visibility("hidden")))
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class A {
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public:
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HIDDEN virtual void foo();
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virtual ~A();
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};
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class HIDDEN B : public A {
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public:
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virtual void foo();
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};
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void A::foo() {}
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void A_foo(A *a) {
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a->foo();
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}
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void B::foo() {
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A::foo();
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}
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