ProcessorTraceTest.cpp
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//===-- ProcessorTraceMonitorTest.cpp -------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "gtest/gtest.h"
#include "ProcessorTrace.h"
#include "llvm/ADT/ArrayRef.h"
using namespace lldb_private;
using namespace process_linux;
size_t ReadCylicBufferWrapper(void *buf, size_t buf_size, void *cyc_buf,
size_t cyc_buf_size, size_t cyc_start,
size_t offset) {
llvm::MutableArrayRef<uint8_t> dst(reinterpret_cast<uint8_t *>(buf),
buf_size);
llvm::MutableArrayRef<uint8_t> src(reinterpret_cast<uint8_t *>(cyc_buf),
cyc_buf_size);
ProcessorTraceMonitor::ReadCyclicBuffer(dst, src, cyc_start, offset);
return dst.size();
}
TEST(CyclicBuffer, EdgeCases) {
size_t bytes_read;
uint8_t cyclic_buffer[6] = {'l', 'i', 'c', 'c', 'y', 'c'};
// We will always leave the last bytes untouched
// so that string comparisons work.
char smaller_buffer[4] = {};
// empty buffer to read into
bytes_read = ReadCylicBufferWrapper(smaller_buffer, 0, cyclic_buffer,
sizeof(cyclic_buffer), 3, 0);
ASSERT_EQ(0u, bytes_read);
// empty cyclic buffer
bytes_read = ReadCylicBufferWrapper(smaller_buffer, sizeof(smaller_buffer),
cyclic_buffer, 0, 3, 0);
ASSERT_EQ(0u, bytes_read);
// bigger offset
bytes_read =
ReadCylicBufferWrapper(smaller_buffer, sizeof(smaller_buffer),
cyclic_buffer, sizeof(cyclic_buffer), 3, 6);
ASSERT_EQ(0u, bytes_read);
// wrong offset
bytes_read =
ReadCylicBufferWrapper(smaller_buffer, sizeof(smaller_buffer),
cyclic_buffer, sizeof(cyclic_buffer), 3, 7);
ASSERT_EQ(0u, bytes_read);
// wrong start
bytes_read =
ReadCylicBufferWrapper(smaller_buffer, sizeof(smaller_buffer),
cyclic_buffer, sizeof(cyclic_buffer), 3, 7);
ASSERT_EQ(0u, bytes_read);
}
TEST(CyclicBuffer, EqualSizeBuffer) {
size_t bytes_read = 0;
uint8_t cyclic_buffer[6] = {'l', 'i', 'c', 'c', 'y', 'c'};
char cyclic[] = "cyclic";
for (size_t i = 0; i < sizeof(cyclic); i++) {
// We will always leave the last bytes untouched
// so that string comparisons work.
char equal_size_buffer[7] = {};
bytes_read =
ReadCylicBufferWrapper(equal_size_buffer, sizeof(cyclic_buffer),
cyclic_buffer, sizeof(cyclic_buffer), 3, i);
ASSERT_EQ((sizeof(cyclic) - i - 1), bytes_read);
ASSERT_STREQ(equal_size_buffer, (cyclic + i));
}
}
TEST(CyclicBuffer, SmallerSizeBuffer) {
size_t bytes_read;
uint8_t cyclic_buffer[6] = {'l', 'i', 'c', 'c', 'y', 'c'};
// We will always leave the last bytes untouched
// so that string comparisons work.
char smaller_buffer[4] = {};
bytes_read =
ReadCylicBufferWrapper(smaller_buffer, (sizeof(smaller_buffer) - 1),
cyclic_buffer, sizeof(cyclic_buffer), 3, 0);
ASSERT_EQ(3u, bytes_read);
ASSERT_STREQ(smaller_buffer, "cyc");
bytes_read =
ReadCylicBufferWrapper(smaller_buffer, (sizeof(smaller_buffer) - 1),
cyclic_buffer, sizeof(cyclic_buffer), 3, 1);
ASSERT_EQ(3u, bytes_read);
ASSERT_STREQ(smaller_buffer, "ycl");
bytes_read =
ReadCylicBufferWrapper(smaller_buffer, (sizeof(smaller_buffer) - 1),
cyclic_buffer, sizeof(cyclic_buffer), 3, 2);
ASSERT_EQ(3u, bytes_read);
ASSERT_STREQ(smaller_buffer, "cli");
bytes_read =
ReadCylicBufferWrapper(smaller_buffer, (sizeof(smaller_buffer) - 1),
cyclic_buffer, sizeof(cyclic_buffer), 3, 3);
ASSERT_EQ(3u, bytes_read);
ASSERT_STREQ(smaller_buffer, "lic");
{
char smaller_buffer[4] = {};
bytes_read =
ReadCylicBufferWrapper(smaller_buffer, (sizeof(smaller_buffer) - 1),
cyclic_buffer, sizeof(cyclic_buffer), 3, 4);
ASSERT_EQ(2u, bytes_read);
ASSERT_STREQ(smaller_buffer, "ic");
}
{
char smaller_buffer[4] = {};
bytes_read =
ReadCylicBufferWrapper(smaller_buffer, (sizeof(smaller_buffer) - 1),
cyclic_buffer, sizeof(cyclic_buffer), 3, 5);
ASSERT_EQ(1u, bytes_read);
ASSERT_STREQ(smaller_buffer, "c");
}
}
TEST(CyclicBuffer, BiggerSizeBuffer) {
size_t bytes_read = 0;
uint8_t cyclic_buffer[6] = {'l', 'i', 'c', 'c', 'y', 'c'};
char cyclic[] = "cyclic";
for (size_t i = 0; i < sizeof(cyclic); i++) {
// We will always leave the last bytes untouched
// so that string comparisons work.
char bigger_buffer[10] = {};
bytes_read =
ReadCylicBufferWrapper(bigger_buffer, (sizeof(bigger_buffer) - 1),
cyclic_buffer, sizeof(cyclic_buffer), 3, i);
ASSERT_EQ((sizeof(cyclic) - i - 1), bytes_read);
ASSERT_STREQ(bigger_buffer, (cyclic + i));
}
}