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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.
31 lines
1.1 KiB
C
31 lines
1.1 KiB
C
// RUN: %clang_cc1 -triple x86_64-pc-linux-gnu -emit-llvm -o - %s -fsanitize=signed-integer-overflow,integer-divide-by-zero -fsanitize-trap=integer-divide-by-zero | FileCheck %s
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int f(int x, int y) {
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// CHECK: %[[B1:.*]] = icmp ne i32 %[[D:.*]], 0
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// CHECK: %[[B2:.*]] = icmp ne i32 %[[N:.*]], -2147483648
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// CHECK: %[[B3:.*]] = icmp ne i32 %[[D]], -1
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// CHECK: %[[B4:.*]] = or i1 %[[B2]], %[[B3]]
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// CHECK: br i1 %[[B1]], label %[[L1:[0-9a-z_.]*]], label %[[L2:[0-9a-z_.]*]]
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// {{^|:}} used to match both Debug form of the captured label
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// cont:
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// and Release form
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// ; <label>:14
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// But avoids false matches inside other numbers such as [114 x i8].
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// CHECK: {{^|:}}[[L2]]
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// CHECK-NEXT: call void @llvm.ubsantrap(i8 3)
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// CHECK-NEXT: unreachable
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// CHECK: {{^|:}}[[L1]]
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// CHECK-NEXT: br i1 %[[B4]], label %[[L3:[0-9a-z_.]*]], label %[[L4:[0-9a-z_.]*]]
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// CHECK: {{^|:}}[[L4]]
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// CHECK-NEXT: zext
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// CHECK-NEXT: zext
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// CHECK-NEXT: __ubsan_handle_divrem_overflow
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// CHECK: {{^|:}}[[L3]]
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// CHECK-NEXT: sdiv i32 %[[N]], %[[D]]
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return x / y;
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}
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