c5978f42ec
Sometimes people get minimal crash reports after a UBSAN incident. This change tags each trap with an integer representing the kind of failure encountered, which can aid in tracking down the root cause of the problem.
37 lines
1.7 KiB
C++
37 lines
1.7 KiB
C++
// RUN: %clang_cc1 -triple x86_64-unknown-linux -fsanitize=cfi-mfcall -fsanitize-trap=cfi-mfcall -fvisibility hidden -emit-llvm -o - %s | FileCheck %s
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// RUN: %clang_cc1 -triple x86_64-unknown-linux -fsanitize=cfi-mfcall -fsanitize-trap=cfi-mfcall -fvisibility default -emit-llvm -o - %s | FileCheck --check-prefix=DEFAULT %s
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// With -fwhole-program-vtables we should get the member function pointer type
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// test, even without hidden visibility.
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// RUN: %clang_cc1 -triple x86_64-unknown-linux -fwhole-program-vtables -emit-llvm -o - %s | FileCheck %s --check-prefix=WPV
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struct B1 {};
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struct B2 {};
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struct B3 : B2 {};
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struct S : B1, B3 {};
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// DEFAULT-NOT: llvm.type.test
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void f(S *s, void (S::*p)()) {
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// WPV: [[OFFSET:%.*]] = sub i64 {{.*}}, 1
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// WPV: [[VFPTR:%.*]] = getelementptr i8, i8* %{{.*}}, i64 [[OFFSET]]
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// WPV: [[TT:%.*]] = call i1 @llvm.type.test(i8* [[VFPTR]], metadata !"_ZTSM1SFvvE.virtual")
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// CHECK: [[OFFSET:%.*]] = sub i64 {{.*}}, 1
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// CHECK: [[VFPTR:%.*]] = getelementptr i8, i8* %{{.*}}, i64 [[OFFSET]]
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// CHECK: [[TT:%.*]] = call i1 @llvm.type.test(i8* [[VFPTR]], metadata !"_ZTSM1SFvvE.virtual")
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// CHECK: br i1 [[TT]], label {{.*}}, label %[[TRAP1:[^,]*]]
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// CHECK: [[TRAP1]]:
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// CHECK-NEXT: llvm.ubsantrap
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// CHECK: [[NVFPTR:%.*]] = bitcast void (%struct.S*)* {{.*}} to i8*
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// CHECK: [[TT1:%.*]] = call i1 @llvm.type.test(i8* [[NVFPTR]], metadata !"_ZTSM2B1FvvE")
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// CHECK: [[OR1:%.*]] = or i1 false, [[TT1]]
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// CHECK: [[TT2:%.*]] = call i1 @llvm.type.test(i8* [[NVFPTR]], metadata !"_ZTSM2B2FvvE")
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// CHECK: [[OR2:%.*]] = or i1 [[OR1]], [[TT2]]
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// CHECK: br i1 [[OR2]], label {{.*}}, label %[[TRAP2:[^,]*]]
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// CHECK: [[TRAP2]]:
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// CHECK-NEXT: llvm.ubsantrap
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(s->*p)();
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}
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