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