1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ART_COMPILER_CFI_TEST_H_ 18 #define ART_COMPILER_CFI_TEST_H_ 19 20 #include <vector> 21 #include <memory> 22 #include <sstream> 23 24 #include "arch/instruction_set.h" 25 #include "dwarf/dwarf_constants.h" 26 #include "dwarf/dwarf_test.h" 27 #include "dwarf/headers.h" 28 #include "disassembler/disassembler.h" 29 #include "gtest/gtest.h" 30 31 namespace art { 32 33 constexpr dwarf::CFIFormat kCFIFormat = dwarf::DW_DEBUG_FRAME_FORMAT; 34 35 class CFITest : public dwarf::DwarfTest { 36 public: 37 void GenerateExpected(FILE* f, InstructionSet isa, const char* isa_str, 38 const std::vector<uint8_t>& actual_asm, 39 const std::vector<uint8_t>& actual_cfi) { 40 std::vector<std::string> lines; 41 // Print the raw bytes. 42 fprintf(f, "static constexpr uint8_t expected_asm_%s[] = {", isa_str); 43 HexDump(f, actual_asm); 44 fprintf(f, "\n};\n"); 45 fprintf(f, "static constexpr uint8_t expected_cfi_%s[] = {", isa_str); 46 HexDump(f, actual_cfi); 47 fprintf(f, "\n};\n"); 48 // Pretty-print CFI opcodes. 49 constexpr bool is64bit = false; 50 dwarf::DebugFrameOpCodeWriter<> initial_opcodes; 51 dwarf::WriteDebugFrameCIE(is64bit, dwarf::DW_EH_PE_absptr, dwarf::Reg(8), 52 initial_opcodes, kCFIFormat, &debug_frame_data_); 53 std::vector<uintptr_t> debug_frame_patches; 54 dwarf::WriteDebugFrameFDE(is64bit, 0, 0, actual_asm.size(), &actual_cfi, 55 kCFIFormat, &debug_frame_data_, &debug_frame_patches); 56 ReformatCfi(Objdump(false, "-W"), &lines); 57 // Pretty-print assembly. 58 auto* opts = new DisassemblerOptions(false, actual_asm.data(), true); 59 std::unique_ptr<Disassembler> disasm(Disassembler::Create(isa, opts)); 60 std::stringstream stream; 61 const uint8_t* base = actual_asm.data() + (isa == kThumb2 ? 1 : 0); 62 disasm->Dump(stream, base, base + actual_asm.size()); 63 ReformatAsm(&stream, &lines); 64 // Print CFI and assembly interleaved. 65 std::stable_sort(lines.begin(), lines.end(), CompareByAddress); 66 for (const std::string& line : lines) { 67 fprintf(f, "// %s\n", line.c_str()); 68 } 69 fprintf(f, "\n"); 70 } 71 72 private: 73 // Helper - get offset just past the end of given string. 74 static size_t FindEndOf(const std::string& str, const char* substr) { 75 size_t pos = str.find(substr); 76 CHECK_NE(std::string::npos, pos); 77 return pos + strlen(substr); 78 } 79 80 // Spit to lines and remove raw instruction bytes. 81 static void ReformatAsm(std::stringstream* stream, 82 std::vector<std::string>* output) { 83 std::string line; 84 while (std::getline(*stream, line)) { 85 line = line.substr(0, FindEndOf(line, ": ")) + 86 line.substr(FindEndOf(line, "\t")); 87 size_t pos; 88 while ((pos = line.find(" ")) != std::string::npos) { 89 line = line.replace(pos, 2, " "); 90 } 91 while (!line.empty() && line.back() == ' ') { 92 line.pop_back(); 93 } 94 output->push_back(line); 95 } 96 } 97 98 // Find interesting parts of objdump output and prefix the lines with address. 99 static void ReformatCfi(const std::vector<std::string>& lines, 100 std::vector<std::string>* output) { 101 std::string address; 102 for (const std::string& line : lines) { 103 if (line.find("DW_CFA_nop") != std::string::npos) { 104 // Ignore. 105 } else if (line.find("DW_CFA_advance_loc") != std::string::npos) { 106 // The last 8 characters are the address. 107 address = "0x" + line.substr(line.size() - 8); 108 } else if (line.find("DW_CFA_") != std::string::npos) { 109 std::string new_line(line); 110 // "bad register" warning is caused by always using host (x86) objdump. 111 const char* bad_reg = "bad register: "; 112 size_t pos; 113 if ((pos = new_line.find(bad_reg)) != std::string::npos) { 114 new_line = new_line.replace(pos, strlen(bad_reg), ""); 115 } 116 // Remove register names in parentheses since they have x86 names. 117 if ((pos = new_line.find(" (")) != std::string::npos) { 118 new_line = new_line.replace(pos, FindEndOf(new_line, ")") - pos, ""); 119 } 120 // Use the .cfi_ prefix. 121 new_line = ".cfi_" + new_line.substr(FindEndOf(new_line, "DW_CFA_")); 122 output->push_back(address + ": " + new_line); 123 } 124 } 125 } 126 127 // Compare strings by the address prefix. 128 static bool CompareByAddress(const std::string& lhs, const std::string& rhs) { 129 EXPECT_EQ(lhs[10], ':'); 130 EXPECT_EQ(rhs[10], ':'); 131 return strncmp(lhs.c_str(), rhs.c_str(), 10) < 0; 132 } 133 134 // Pretty-print byte array. 12 bytes per line. 135 static void HexDump(FILE* f, const std::vector<uint8_t>& data) { 136 for (size_t i = 0; i < data.size(); i++) { 137 fprintf(f, i % 12 == 0 ? "\n " : " "); // Whitespace. 138 fprintf(f, "0x%02X,", data[i]); 139 } 140 } 141 }; 142 143 } // namespace art 144 145 #endif // ART_COMPILER_CFI_TEST_H_ 146
