1 //===-- Unittests for memset ----------------------------------------------===//
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 "src/string/memset.h"
10 #include "utils/CPP/ArrayRef.h"
11 #include "utils/UnitTest/Test.h"
12
13 using __llvm_libc::cpp::Array;
14 using __llvm_libc::cpp::ArrayRef;
15 using Data = Array<char, 2048>;
16
17 static const ArrayRef<char> kDeadcode("DEADC0DE", 8);
18
19 // Returns a Data object filled with a repetition of `filler`.
getData(ArrayRef<char> filler)20 Data getData(ArrayRef<char> filler) {
21 Data out;
22 for (size_t i = 0; i < out.size(); ++i)
23 out[i] = filler[i % filler.size()];
24 return out;
25 }
26
TEST(MemsetTest,Thorough)27 TEST(MemsetTest, Thorough) {
28 const Data dirty = getData(kDeadcode);
29 for (int value = -1; value <= 1; ++value) {
30 for (size_t count = 0; count < 1024; ++count) {
31 for (size_t align = 0; align < 64; ++align) {
32 auto buffer = dirty;
33 void *const dst = &buffer[align];
34 void *const ret = __llvm_libc::memset(dst, value, count);
35 // Return value is `dst`.
36 ASSERT_EQ(ret, dst);
37 // Everything before copy is untouched.
38 for (size_t i = 0; i < align; ++i)
39 ASSERT_EQ(buffer[i], dirty[i]);
40 // Everything in between is copied.
41 for (size_t i = 0; i < count; ++i)
42 ASSERT_EQ(buffer[align + i], (char)value);
43 // Everything after copy is untouched.
44 for (size_t i = align + count; i < dirty.size(); ++i)
45 ASSERT_EQ(buffer[i], dirty[i]);
46 }
47 }
48 }
49 }
50
51 // FIXME: Add tests with reads and writes on the boundary of a read/write
52 // protected page to check we're not reading nor writing prior/past the allowed
53 // regions.
54