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.
62 lines
2.0 KiB
C
62 lines
2.0 KiB
C
// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -ftrapv %s -emit-llvm -o - | FileCheck %s
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unsigned int ui, uj, uk;
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int i, j, k;
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// CHECK-LABEL: define void @test0()
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void test0() {
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// -ftrapv doesn't affect unsigned arithmetic.
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// CHECK: [[T1:%.*]] = load i32, i32* @uj
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// CHECK-NEXT: [[T2:%.*]] = load i32, i32* @uk
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// CHECK-NEXT: [[T3:%.*]] = add i32 [[T1]], [[T2]]
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// CHECK-NEXT: store i32 [[T3]], i32* @ui
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ui = uj + uk;
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// CHECK: [[T1:%.*]] = load i32, i32* @j
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// CHECK-NEXT: [[T2:%.*]] = load i32, i32* @k
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// CHECK-NEXT: [[T3:%.*]] = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 [[T1]], i32 [[T2]])
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// CHECK-NEXT: [[T4:%.*]] = extractvalue { i32, i1 } [[T3]], 0
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// CHECK-NEXT: [[T5:%.*]] = extractvalue { i32, i1 } [[T3]], 1
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// CHECK-NEXT: [[T6:%.*]] = xor i1 [[T5]], true
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// CHECK-NEXT: br i1 [[T6]]
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// CHECK: call void @llvm.ubsantrap(i8 0)
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i = j + k;
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}
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// CHECK-LABEL: define void @test1()
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void test1() {
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extern void opaque(int);
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opaque(i++);
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// CHECK: [[T1:%.*]] = load i32, i32* @i
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// CHECK-NEXT: [[T2:%.*]] = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 [[T1]], i32 1)
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// CHECK-NEXT: [[T3:%.*]] = extractvalue { i32, i1 } [[T2]], 0
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// CHECK-NEXT: [[T4:%.*]] = extractvalue { i32, i1 } [[T2]], 1
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// CHECK-NEXT: [[T5:%.*]] = xor i1 [[T4]], true
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// CHECK-NEXT: br i1 [[T5]]
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// CHECK: call void @llvm.ubsantrap(i8 0)
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}
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// CHECK-LABEL: define void @test2()
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void test2() {
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extern void opaque(int);
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opaque(++i);
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// CHECK: [[T1:%.*]] = load i32, i32* @i
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// CHECK-NEXT: [[T2:%.*]] = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 [[T1]], i32 1)
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// CHECK-NEXT: [[T3:%.*]] = extractvalue { i32, i1 } [[T2]], 0
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// CHECK-NEXT: [[T4:%.*]] = extractvalue { i32, i1 } [[T2]], 1
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// CHECK-NEXT: [[T5:%.*]] = xor i1 [[T4]], true
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// CHECK-NEXT: br i1 [[T5]]
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// CHECK: call void @llvm.ubsantrap(i8 0)
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}
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// CHECK-LABEL: define void @test3(
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void test3(int a, int b, float c, float d) {
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// CHECK-NOT: @llvm.trap
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(void)(a / b);
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(void)(a % b);
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(void)(c / d);
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// CHECK: }
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}
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