95 lines · cpp
1// RUN: %clang_cc1 -triple x86_64-unknown-linux -flto -flto-unit -fvirtual-function-elimination -fwhole-program-vtables -emit-llvm -o - %s | FileCheck %s2// 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=NOVFE3 4struct __attribute__((visibility("default"))) A {5 virtual void foo();6};7 8void test_1(A *p) {9 // A has default visibility, so no need for type.checked.load.10// CHECK-LABEL: define{{.*}} void @_Z6test_1P1A11// NOVFE-LABEL: define dso_local void @_Z6test_1P1A12// CHECK: [[FN_PTR_ADDR:%.+]] = getelementptr inbounds ptr, ptr {{%.+}}, i64 013// NOVFE: [[FN_PTR_ADDR:%.+]] = getelementptr inbounds ptr, ptr {{%.+}}, i64 014// CHECK: [[FN_PTR:%.+]] = load ptr, ptr [[FN_PTR_ADDR]]15// NOVFE: [[FN_PTR:%.+]] = load ptr, ptr [[FN_PTR_ADDR]]16// CHECK: call void [[FN_PTR]](17// NOVFE: call void [[FN_PTR]](18 p->foo();19}20 21 22struct __attribute__((visibility("hidden"))) [[clang::lto_visibility_public]] B {23 virtual void foo();24};25 26void test_2(B *p) {27 // B has public LTO visibility, so no need for type.checked.load.28// CHECK-LABEL: define{{.*}} void @_Z6test_2P1B29// NOVFE-LABEL: define dso_local void @_Z6test_2P1B30// CHECK: [[FN_PTR_ADDR:%.+]] = getelementptr inbounds ptr, ptr {{%.+}}, i64 031// NOVFE: [[FN_PTR_ADDR:%.+]] = getelementptr inbounds ptr, ptr {{%.+}}, i64 032// CHECK: [[FN_PTR:%.+]] = load ptr, ptr [[FN_PTR_ADDR]]33// NOVFE: [[FN_PTR:%.+]] = load ptr, ptr [[FN_PTR_ADDR]]34// CHECK: call void [[FN_PTR]](35// NOVFE: call void [[FN_PTR]](36 p->foo();37}38 39 40struct __attribute__((visibility("hidden"))) C {41 virtual void foo();42 virtual void bar();43};44 45void test_3(C *p) {46 // C has hidden visibility, so we generate type.checked.load to allow VFE.47// CHECK-LABEL: define{{.*}} void @_Z6test_3P1C48// NOVFE-LABEL: define dso_local void @_Z6test_3P1C49// CHECK: [[LOAD:%.+]] = call { ptr, i1 } @llvm.type.checked.load(ptr {{%.+}}, i32 0, metadata !"_ZTS1C")50// NOVFE: call i1 @llvm.type.test(ptr {{%.+}}, metadata !"_ZTS1C")51// CHECK: [[FN_PTR:%.+]] = extractvalue { ptr, i1 } [[LOAD]], 052// NOVFE: [[FN_PTR:%.+]] = load ptr, ptr {{%.+}}, align 853// CHECK: call void [[FN_PTR]](54// NOVFE: call void [[FN_PTR]](55 p->foo();56}57 58void test_4(C *p) {59 // When using type.checked.load, we pass the vtable offset to the intrinsic,60 // rather than adding it to the pointer with a GEP.61// CHECK-LABEL: define{{.*}} void @_Z6test_4P1C62// NOVFE-LABEL: define dso_local void @_Z6test_4P1C63// CHECK: [[LOAD:%.+]] = call { ptr, i1 } @llvm.type.checked.load(ptr {{%.+}}, i32 8, metadata !"_ZTS1C")64// NOVFE: call i1 @llvm.type.test(ptr {{%.+}}, metadata !"_ZTS1C")65// CHECK: [[FN_PTR:%.+]] = extractvalue { ptr, i1 } [[LOAD]], 066// NOVFE: [[FN_PTR:%.+]] = load ptr, ptr {{%.+}}, align 867// CHECK: call void [[FN_PTR]](68// NOVFE: call void [[FN_PTR]](69 p->bar();70}71 72void test_5(C *p, void (C::*q)(void)) {73 // We also use type.checked.load for the virtual side of member function74 // pointer calls. We use a GEP to calculate the address to load from and pass75 // 0 as the offset to the intrinsic, because we know that the load must be76 // from exactly the point marked by one of the function-type metadatas (in77 // this case "_ZTSM1CFvvE.virtual"). If we passed the offset from the member78 // function pointer to the intrinsic, this information would be lost. No79 // codegen changes on the non-virtual side.80// CHECK-LABEL: define{{.*}} void @_Z6test_5P1CMS_FvvE(81// NOVFE-LABEL: define dso_local void @_Z6test_5P1CMS_FvvE(82// CHECK: [[FN_PTR_ADDR:%.+]] = getelementptr i8, ptr %vtable, i64 {{%.+}}83// CHECK: [[LOAD:%.+]] = call { ptr, i1 } @llvm.type.checked.load(ptr [[FN_PTR_ADDR]], i32 0, metadata !"_ZTSM1CFvvE.virtual")84// NOVFE-NOT: call { ptr, i1 } @llvm.type.checked.load(ptr {{%.+}}, i32 0, metadata !"_ZTSM1CFvvE.virtual")85// NOVFE: call i1 @llvm.type.test(ptr {{%.+}}, metadata !"_ZTSM1CFvvE.virtual")86// CHECK: [[FN_PTR:%.+]] = extractvalue { ptr, i1 } [[LOAD]], 087// NOVFE: [[FN_PTR:%.+]] = load ptr, ptr {{%.+}}, align 888 89// CHECK: [[PHI:%.+]] = phi ptr [ [[FN_PTR]], {{.*}} ]90// NOVFE: [[PHI:%.+]] = phi ptr [ [[FN_PTR]], {{.*}} ]91// CHECK: call void [[PHI]](92// NOVFE: call void [[PHI]](93 (p->*q)();94}95