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
TEST(LlvmLibcMemcmpTest,CmpZeroByte)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
TEST(LlvmLibcMemcmpTest,LhsRhsAreTheSame)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
TEST(LlvmLibcMemcmpTest,LhsBeforeRhsLexically)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
TEST(LlvmLibcMemcmpTest,LhsAfterRhsLexically)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
TEST(LlvmLibcMemcmpTest,Issue77080)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.
Adaptor(cpp::span<char> p1,cpp::span<char> p2,size_t size)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
TEST(LlvmLibcMemcmpTest,SizeSweep)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