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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_COMPILER_CFI_TEST_H_
#define ART_COMPILER_CFI_TEST_H_
#include <memory>
#include <sstream>
#include <vector>
#include "arch/instruction_set.h"
#include "base/enums.h"
#include "base/macros.h"
#include "debug/dwarf/dwarf_test.h"
#include "disassembler.h"
#include "dwarf/dwarf_constants.h"
#include "dwarf/headers.h"
#include "gtest/gtest.h"
#include "thread.h"
namespace art HIDDEN {
class CFITest : public dwarf::DwarfTest {
public:
void GenerateExpected(FILE* f, InstructionSet isa, const char* isa_str,
ArrayRef<const uint8_t> actual_asm,
ArrayRef<const uint8_t> actual_cfi) {
std::vector<std::string> lines;
// Print the raw bytes.
fprintf(f, "static constexpr uint8_t expected_asm_%s[] = {", isa_str);
HexDump(f, actual_asm);
fprintf(f, "\n};\n");
fprintf(f, "static constexpr uint8_t expected_cfi_%s[] = {", isa_str);
HexDump(f, actual_cfi);
fprintf(f, "\n};\n");
// Pretty-print CFI opcodes.
constexpr bool is64bit = false;
dwarf::DebugFrameOpCodeWriter<> initial_opcodes;
dwarf::WriteCIE(is64bit, dwarf::Reg(8), initial_opcodes, &debug_frame_data_);
std::vector<uintptr_t> debug_frame_patches;
dwarf::WriteFDE(is64bit,
/* cie_pointer= */ 0,
/* code_address= */ 0,
actual_asm.size(),
actual_cfi,
&debug_frame_data_);
ReformatCfi(Objdump(false, "-W"), &lines);
// Pretty-print assembly.
const uint8_t* asm_base = actual_asm.data();
const uint8_t* asm_end = asm_base + actual_asm.size();
auto* opts = new DisassemblerOptions(false,
asm_base,
asm_end,
true,
is64bit
? &Thread::DumpThreadOffset<PointerSize::k64>
: &Thread::DumpThreadOffset<PointerSize::k32>);
std::unique_ptr<Disassembler> disasm(Disassembler::Create(isa, opts));
std::stringstream stream;
const uint8_t* base = actual_asm.data() + (isa == InstructionSet::kThumb2 ? 1 : 0);
disasm->Dump(stream, base, base + actual_asm.size());
ReformatAsm(&stream, &lines);
// Print CFI and assembly interleaved.
std::stable_sort(lines.begin(), lines.end(), CompareByAddress);
for (const std::string& line : lines) {
fprintf(f, "// %s\n", line.c_str());
}
fprintf(f, "\n");
}
private:
// Helper - get offset just past the end of given string.
static size_t FindEndOf(const std::string& str, const char* substr) {
size_t pos = str.find(substr);
CHECK_NE(std::string::npos, pos);
return pos + strlen(substr);
}
// Spit to lines and remove raw instruction bytes.
static void ReformatAsm(std::stringstream* stream,
std::vector<std::string>* output) {
std::string line;
while (std::getline(*stream, line)) {
line = line.substr(0, FindEndOf(line, ": ")) +
line.substr(FindEndOf(line, "\t"));
size_t pos;
while ((pos = line.find(" ")) != std::string::npos) {
line = line.replace(pos, 2, " ");
}
while (!line.empty() && line.back() == ' ') {
line.pop_back();
}
output->push_back(line);
}
}
// Find interesting parts of objdump output and prefix the lines with address.
static void ReformatCfi(const std::vector<std::string>& lines,
std::vector<std::string>* output) {
std::string address;
for (const std::string& line : lines) {
if (line.find("DW_CFA_nop") != std::string::npos) {
// Ignore.
} else if (line.find("DW_CFA_advance_loc") != std::string::npos) {
// The last 8 characters are the address.
address = "0x" + line.substr(line.size() - 8);
} else if (line.find("DW_CFA_") != std::string::npos) {
std::string new_line(line);
// "bad register" warning is caused by always using host (x86) objdump.
const char* bad_reg = "bad register: ";
size_t pos;
if ((pos = new_line.find(bad_reg)) != std::string::npos) {
new_line = new_line.replace(pos, strlen(bad_reg), "");
}
// Remove register names in parentheses since they have x86 names.
if ((pos = new_line.find(" (")) != std::string::npos) {
new_line = new_line.replace(pos, FindEndOf(new_line, ")") - pos, "");
}
// Use the .cfi_ prefix.
new_line = ".cfi_" + new_line.substr(FindEndOf(new_line, "DW_CFA_"));
output->push_back(address + ": " + new_line);
}
}
}
// Compare strings by the address prefix.
static bool CompareByAddress(const std::string& lhs, const std::string& rhs) {
EXPECT_EQ(lhs[10], ':');
EXPECT_EQ(rhs[10], ':');
return strncmp(lhs.c_str(), rhs.c_str(), 10) < 0;
}
// Pretty-print byte array. 12 bytes per line.
static void HexDump(FILE* f, ArrayRef<const uint8_t> data) {
for (size_t i = 0; i < data.size(); i++) {
fprintf(f, i % 12 == 0 ? "\n " : " "); // Whitespace.
fprintf(f, "0x%02X,", data[i]);
}
}
};
} // namespace art
#endif // ART_COMPILER_CFI_TEST_H_
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