| 1 | //===-- Unittests for memcmp ----------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "hdr/signal_macros.h" |
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| 10 | #include "memory_utils/memory_check_utils.h" |
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| 11 | #include "src/__support/macros/config.h" |
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| 12 | #include "src/string/memcmp.h" |
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| 13 | #include "test/UnitTest/Test.h" |
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| 14 | #include "test/UnitTest/TestLogger.h" |
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| 15 | |
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| 16 | namespace LIBC_NAMESPACE_DECL { |
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| 17 | |
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| 18 | TEST(LlvmLibcMemcmpTest, CmpZeroByte) { |
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| 19 | const char *lhs = "ab" ; |
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| 20 | const char *rhs = "yz" ; |
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| 21 | EXPECT_EQ(LIBC_NAMESPACE::memcmp(lhs, rhs, 0), 0); |
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| 22 | } |
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| 23 | |
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| 24 | TEST(LlvmLibcMemcmpTest, LhsRhsAreTheSame) { |
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| 25 | const char *lhs = "ab" ; |
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| 26 | const char *rhs = "ab" ; |
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| 27 | EXPECT_EQ(LIBC_NAMESPACE::memcmp(lhs, rhs, 2), 0); |
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| 28 | } |
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| 29 | |
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| 30 | TEST(LlvmLibcMemcmpTest, LhsBeforeRhsLexically) { |
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| 31 | const char *lhs = "ab" ; |
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| 32 | const char *rhs = "az" ; |
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| 33 | EXPECT_LT(LIBC_NAMESPACE::memcmp(lhs, rhs, 2), 0); |
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| 34 | } |
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| 35 | |
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| 36 | TEST(LlvmLibcMemcmpTest, LhsAfterRhsLexically) { |
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| 37 | const char *lhs = "az" ; |
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| 38 | const char *rhs = "ab" ; |
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| 39 | EXPECT_GT(LIBC_NAMESPACE::memcmp(lhs, rhs, 2), 0); |
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| 40 | } |
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| 41 | |
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| 42 | TEST(LlvmLibcMemcmpTest, Issue77080) { |
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| 43 | // https://github.com/llvm/llvm-project/issues/77080 |
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| 44 | constexpr char lhs[35] = "1.069cd68bbe76eb2143a3284d27ebe220" ; |
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| 45 | constexpr char rhs[35] = "1.0500185b5d966a544e2d0fa40701b0f3" ; |
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| 46 | ASSERT_GE(LIBC_NAMESPACE::memcmp(lhs, rhs, 34), 1); |
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| 47 | } |
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| 48 | |
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| 49 | // Adapt CheckMemcmp signature to memcmp. |
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| 50 | static inline int Adaptor(cpp::span<char> p1, cpp::span<char> p2, size_t size) { |
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| 51 | return LIBC_NAMESPACE::memcmp(p1.begin(), p2.begin(), size); |
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| 52 | } |
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| 53 | |
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| 54 | TEST(LlvmLibcMemcmpTest, SizeSweep) { |
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| 55 | static constexpr size_t kMaxSize = 400; |
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| 56 | Buffer Buffer1(kMaxSize); |
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| 57 | Buffer Buffer2(kMaxSize); |
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| 58 | Randomize(Buffer1.span()); |
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| 59 | for (size_t size = 0; size < kMaxSize; ++size) { |
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| 60 | auto span1 = Buffer1.span().subspan(0, size); |
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| 61 | auto span2 = Buffer2.span().subspan(0, size); |
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| 62 | const bool OK = CheckMemcmp<Adaptor>(span1, span2, size); |
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| 63 | if (!OK) |
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| 64 | testing::tlog << "Failed at size=" << size << '\n'; |
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| 65 | ASSERT_TRUE(OK); |
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| 66 | } |
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| 67 | } |
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| 68 | |
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| 69 | #if defined(LIBC_ADD_NULL_CHECKS) && !defined(LIBC_HAS_SANITIZER) |
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| 70 | |
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| 71 | TEST(LlvmLibcMemcmpTest, CrashOnNullPtr) { |
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| 72 | ASSERT_DEATH([]() { LIBC_NAMESPACE::memcmp(nullptr, nullptr, 1); }, |
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| 73 | WITH_SIGNAL(-1)); |
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| 74 | } |
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| 75 | |
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| 76 | #endif // defined(LIBC_ADD_NULL_CHECKS) && !defined(LIBC_HAS_SANITIZER) |
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| 77 | |
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| 78 | } // namespace LIBC_NAMESPACE_DECL |
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| 79 | |
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