76236fafda
From @vitalybuka's review on https://github.com/llvm/llvm-project/pull/104889: - [x] remove unused variable in tests - [x] rename `post-decr-while` --> `unsigned-post-decr-while` - [x] split `add-overflow-test` into `add-unsigned-overflow-test` and `add-signed-overflow-test` - [x] be more clear about defaults within docs - [x] add table to docs Here's a screenshot of the rendered table so you don't have to build the html docs yourself to inspect the layout:  CCs: @vitalybuka --------- Signed-off-by: Justin Stitt <justinstitt@google.com> Co-authored-by: Vitaly Buka <vitalybuka@google.com>
63 lines
1.6 KiB
C
63 lines
1.6 KiB
C
// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fsanitize=signed-integer-overflow,unsigned-integer-overflow -fsanitize-undefined-ignore-overflow-pattern=all %s -emit-llvm -o - | FileCheck %s
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// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fsanitize=signed-integer-overflow,unsigned-integer-overflow -fsanitize-undefined-ignore-overflow-pattern=all -fwrapv %s -emit-llvm -o - | FileCheck %s
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// Check for potential false positives from patterns that _almost_ match classic overflow-dependent or overflow-prone code patterns
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extern unsigned a, b, c;
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extern unsigned some(void);
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// Make sure all these still have handler paths, we shouldn't be excluding
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// instrumentation of any "near" patterns.
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// CHECK-LABEL: close_but_not_quite
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void close_but_not_quite(void) {
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// CHECK: br i1{{.*}}handler.
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if (a + b > a)
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c = 9;
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// CHECK: br i1{{.*}}handler.
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if (a - b < a)
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c = 9;
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// CHECK: br i1{{.*}}handler.
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if (a + b < a)
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c = 9;
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// CHECK: br i1{{.*}}handler.
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if (a + b + 1 < a)
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c = 9;
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// CHECK: br i1{{.*}}handler.
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// CHECK: br i1{{.*}}handler.
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if (a + b < a + 1)
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c = 9;
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// CHECK: br i1{{.*}}handler.
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if (b >= a + b)
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c = 9;
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// CHECK: br i1{{.*}}handler.
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if (a + a < a)
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c = 9;
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// CHECK: br i1{{.*}}handler.
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if (a + b == a)
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c = 9;
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// CHECK: br i1{{.*}}handler
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while (--a)
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some();
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}
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// CHECK-LABEL: function_calls
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void function_calls(void) {
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// CHECK: br i1{{.*}}handler
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if (some() + b < some())
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c = 9;
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}
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// CHECK-LABEL: not_quite_a_negated_unsigned_const
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void not_quite_a_negated_unsigned_const(void) {
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// CHECK: br i1{{.*}}handler
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a = -b;
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}
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