forked from OSchip/llvm-project
50 lines
1.7 KiB
C++
50 lines
1.7 KiB
C++
//===-- Unittests for bzero -----------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "src/__support/CPP/ArrayRef.h"
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#include "src/string/bzero.h"
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#include "utils/UnitTest/Test.h"
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using __llvm_libc::cpp::Array;
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using __llvm_libc::cpp::ArrayRef;
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using Data = Array<char, 2048>;
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static const ArrayRef<char> kDeadcode("DEADC0DE", 8);
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// Returns a Data object filled with a repetition of `filler`.
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Data getData(ArrayRef<char> filler) {
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Data out;
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for (size_t i = 0; i < out.size(); ++i)
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out[i] = filler[i % filler.size()];
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return out;
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}
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TEST(LlvmLibcBzeroTest, Thorough) {
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const Data dirty = getData(kDeadcode);
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for (size_t count = 0; count < 1024; ++count) {
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for (size_t align = 0; align < 64; ++align) {
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auto buffer = dirty;
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char *const dst = &buffer[align];
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__llvm_libc::bzero(dst, count);
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// Everything before copy is untouched.
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for (size_t i = 0; i < align; ++i)
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ASSERT_EQ(buffer[i], dirty[i]);
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// Everything in between is copied.
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for (size_t i = 0; i < count; ++i)
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ASSERT_EQ(buffer[align + i], char(0));
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// Everything after copy is untouched.
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for (size_t i = align + count; i < dirty.size(); ++i)
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ASSERT_EQ(buffer[i], dirty[i]);
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}
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}
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}
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// FIXME: Add tests with reads and writes on the boundary of a read/write
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// protected page to check we're not reading nor writing prior/past the allowed
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// regions.
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