97 lines
4.7 KiB
C++
97 lines
4.7 KiB
C++
// RUN: %clang_cc1 -triple x86_64-unknown-linux -flto -flto-unit -fvirtual-function-elimination -fwhole-program-vtables -emit-llvm -o - %s | FileCheck %s
|
|
// RUN: %clang -target x86_64-unknown-linux -flto -fvirtual-function-elimination -fno-virtual-function-elimination -fwhole-program-vtables -S -emit-llvm -o - %s | FileCheck %s -check-prefix=NOVFE
|
|
|
|
struct __attribute__((visibility("default"))) A {
|
|
virtual void foo();
|
|
};
|
|
|
|
void test_1(A *p) {
|
|
// A has default visibility, so no need for type.checked.load.
|
|
// CHECK-LABEL: define{{.*}} void @_Z6test_1P1A
|
|
// NOVFE-LABEL: define dso_local void @_Z6test_1P1A
|
|
// CHECK: [[FN_PTR_ADDR:%.+]] = getelementptr inbounds void (%struct.A*)*, void (%struct.A*)** {{%.+}}, i64 0
|
|
// NOVFE: [[FN_PTR_ADDR:%.+]] = getelementptr inbounds void (%struct.A*)*, void (%struct.A*)** {{%.+}}, i64 0
|
|
// CHECK: [[FN_PTR:%.+]] = load void (%struct.A*)*, void (%struct.A*)** [[FN_PTR_ADDR]]
|
|
// NOVFE: [[FN_PTR:%.+]] = load void (%struct.A*)*, void (%struct.A*)** [[FN_PTR_ADDR]]
|
|
// CHECK: call void [[FN_PTR]](
|
|
// NOVFE: call void [[FN_PTR]](
|
|
p->foo();
|
|
}
|
|
|
|
|
|
struct __attribute__((visibility("hidden"))) [[clang::lto_visibility_public]] B {
|
|
virtual void foo();
|
|
};
|
|
|
|
void test_2(B *p) {
|
|
// B has public LTO visibility, so no need for type.checked.load.
|
|
// CHECK-LABEL: define{{.*}} void @_Z6test_2P1B
|
|
// NOVFE-LABEL: define dso_local void @_Z6test_2P1B
|
|
// CHECK: [[FN_PTR_ADDR:%.+]] = getelementptr inbounds void (%struct.B*)*, void (%struct.B*)** {{%.+}}, i64 0
|
|
// NOVFE: [[FN_PTR_ADDR:%.+]] = getelementptr inbounds void (%struct.B*)*, void (%struct.B*)** {{%.+}}, i64 0
|
|
// CHECK: [[FN_PTR:%.+]] = load void (%struct.B*)*, void (%struct.B*)** [[FN_PTR_ADDR]]
|
|
// NOVFE: [[FN_PTR:%.+]] = load void (%struct.B*)*, void (%struct.B*)** [[FN_PTR_ADDR]]
|
|
// CHECK: call void [[FN_PTR]](
|
|
// NOVFE: call void [[FN_PTR]](
|
|
p->foo();
|
|
}
|
|
|
|
|
|
struct __attribute__((visibility("hidden"))) C {
|
|
virtual void foo();
|
|
virtual void bar();
|
|
};
|
|
|
|
void test_3(C *p) {
|
|
// C has hidden visibility, so we generate type.checked.load to allow VFE.
|
|
// CHECK-LABEL: define{{.*}} void @_Z6test_3P1C
|
|
// NOVFE-LABEL: define dso_local void @_Z6test_3P1C
|
|
// CHECK: [[LOAD:%.+]] = call { i8*, i1 } @llvm.type.checked.load(i8* {{%.+}}, i32 0, metadata !"_ZTS1C")
|
|
// NOVFE: call i1 @llvm.type.test(i8* {{%.+}}, metadata !"_ZTS1C")
|
|
// CHECK: [[FN_PTR_I8:%.+]] = extractvalue { i8*, i1 } [[LOAD]], 0
|
|
// NOVFE: [[FN_PTR:%.+]] = load void (%struct.C*)*, void (%struct.C*)** {{%.+}}, align 8
|
|
// CHECK: [[FN_PTR:%.+]] = bitcast i8* [[FN_PTR_I8]] to void (%struct.C*)*
|
|
// CHECK: call void [[FN_PTR]](
|
|
// NOVFE: call void [[FN_PTR]](
|
|
p->foo();
|
|
}
|
|
|
|
void test_4(C *p) {
|
|
// When using type.checked.load, we pass the vtable offset to the intrinsic,
|
|
// rather than adding it to the pointer with a GEP.
|
|
// CHECK-LABEL: define{{.*}} void @_Z6test_4P1C
|
|
// NOVFE-LABEL: define dso_local void @_Z6test_4P1C
|
|
// CHECK: [[LOAD:%.+]] = call { i8*, i1 } @llvm.type.checked.load(i8* {{%.+}}, i32 8, metadata !"_ZTS1C")
|
|
// NOVFE: call i1 @llvm.type.test(i8* {{%.+}}, metadata !"_ZTS1C")
|
|
// CHECK: [[FN_PTR_I8:%.+]] = extractvalue { i8*, i1 } [[LOAD]], 0
|
|
// NOVFE: [[FN_PTR:%.+]] = load void (%struct.C*)*, void (%struct.C*)** {{%.+}}, align 8
|
|
// CHECK: [[FN_PTR:%.+]] = bitcast i8* [[FN_PTR_I8]] to void (%struct.C*)*
|
|
// CHECK: call void [[FN_PTR]](
|
|
// NOVFE: call void [[FN_PTR]](
|
|
p->bar();
|
|
}
|
|
|
|
void test_5(C *p, void (C::*q)(void)) {
|
|
// We also use type.checked.load for the virtual side of member function
|
|
// pointer calls. We use a GEP to calculate the address to load from and pass
|
|
// 0 as the offset to the intrinsic, because we know that the load must be
|
|
// from exactly the point marked by one of the function-type metadatas (in
|
|
// this case "_ZTSM1CFvvE.virtual"). If we passed the offset from the member
|
|
// function pointer to the intrinsic, this information would be lost. No
|
|
// codegen changes on the non-virtual side.
|
|
// CHECK-LABEL: define{{.*}} void @_Z6test_5P1CMS_FvvE(
|
|
// NOVFE-LABEL: define dso_local void @_Z6test_5P1CMS_FvvE(
|
|
// CHECK: [[FN_PTR_ADDR:%.+]] = getelementptr i8, i8* %vtable, i64 {{%.+}}
|
|
// CHECK: [[LOAD:%.+]] = call { i8*, i1 } @llvm.type.checked.load(i8* [[FN_PTR_ADDR]], i32 0, metadata !"_ZTSM1CFvvE.virtual")
|
|
// NOVFE-NOT: call { i8*, i1 } @llvm.type.checked.load(i8* {{%.+}}, i32 0, metadata !"_ZTSM1CFvvE.virtual")
|
|
// CHECK: [[FN_PTR_I8:%.+]] = extractvalue { i8*, i1 } [[LOAD]], 0
|
|
// CHECK: [[FN_PTR:%.+]] = bitcast i8* [[FN_PTR_I8]] to void (%struct.C*)*
|
|
// NOVFE: [[FN_PTR:%.+]] = load void (%struct.C*)*, void (%struct.C*)** {{%.+}}, align 8
|
|
|
|
// CHECK: [[PHI:%.+]] = phi void (%struct.C*)* {{.*}}[ [[FN_PTR]], {{.*}} ]
|
|
// NOVFE: [[PHI:%.+]] = phi void (%struct.C*)* {{.*}}[ [[FN_PTR]], {{.*}} ]
|
|
// CHECK: call void [[PHI]](
|
|
// NOVFE: call void [[PHI]](
|
|
(p->*q)();
|
|
}
|