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