1 //===-- Unittests for memcpy ----------------------------------------------===// 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/__support/CPP/ArrayRef.h" 10 #include "src/string/memcpy.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> k_numbers("0123456789", 10); 18 static const ArrayRef<char> k_deadcode("DEADC0DE", 8); 19 20 // Returns a Data object filled with a repetition of `filler`. 21 Data get_data(ArrayRef<char> filler) { 22 Data out; 23 for (size_t i = 0; i < out.size(); ++i) 24 out[i] = filler[i % filler.size()]; 25 return out; 26 } 27 28 TEST(LlvmLibcMemcpyTest, Thorough) { 29 const Data groundtruth = get_data(k_numbers); 30 const Data dirty = get_data(k_deadcode); 31 for (size_t count = 0; count < 1024; ++count) { 32 for (size_t align = 0; align < 64; ++align) { 33 auto buffer = dirty; 34 const char *const src = groundtruth.data(); 35 void *const dst = &buffer[align]; 36 void *const ret = __llvm_libc::memcpy(dst, src, count); 37 // Return value is `dst`. 38 ASSERT_EQ(ret, dst); 39 // Everything before copy is untouched. 40 for (size_t i = 0; i < align; ++i) 41 ASSERT_EQ(buffer[i], dirty[i]); 42 // Everything in between is copied. 43 for (size_t i = 0; i < count; ++i) 44 ASSERT_EQ(buffer[align + i], groundtruth[i]); 45 // Everything after copy is untouched. 46 for (size_t i = align + count; i < dirty.size(); ++i) 47 ASSERT_EQ(buffer[i], dirty[i]); 48 } 49 } 50 } 51 52 // FIXME: Add tests with reads and writes on the boundary of a read/write 53 // protected page to check we're not reading nor writing prior/past the allowed 54 // regions. 55