| /* |
| * Copyright (C) 2012 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. |
| */ |
| |
| #include "elf_writer_quick.h" |
| |
| #include <unordered_map> |
| |
| #include "base/logging.h" |
| #include "base/unix_file/fd_file.h" |
| #include "buffered_output_stream.h" |
| #include "compiled_method.h" |
| #include "driver/compiler_driver.h" |
| #include "driver/compiler_options.h" |
| #include "dwarf.h" |
| #include "dwarf/debug_frame_writer.h" |
| #include "dwarf/debug_line_writer.h" |
| #include "elf_builder.h" |
| #include "elf_file.h" |
| #include "elf_utils.h" |
| #include "file_output_stream.h" |
| #include "globals.h" |
| #include "leb128.h" |
| #include "oat.h" |
| #include "oat_writer.h" |
| #include "utils.h" |
| |
| namespace art { |
| |
| static void PushByte(std::vector<uint8_t>* buf, int data) { |
| buf->push_back(data & 0xff); |
| } |
| |
| static uint32_t PushStr(std::vector<uint8_t>* buf, const char* str, const char* def = nullptr) { |
| if (str == nullptr) { |
| str = def; |
| } |
| |
| uint32_t offset = buf->size(); |
| for (size_t i = 0; str[i] != '\0'; ++i) { |
| buf->push_back(str[i]); |
| } |
| buf->push_back('\0'); |
| return offset; |
| } |
| |
| static uint32_t PushStr(std::vector<uint8_t>* buf, const std::string &str) { |
| uint32_t offset = buf->size(); |
| buf->insert(buf->end(), str.begin(), str.end()); |
| buf->push_back('\0'); |
| return offset; |
| } |
| |
| static void UpdateWord(std::vector<uint8_t>* buf, int offset, int data) { |
| (*buf)[offset+0] = data; |
| (*buf)[offset+1] = data >> 8; |
| (*buf)[offset+2] = data >> 16; |
| (*buf)[offset+3] = data >> 24; |
| } |
| |
| static void PushHalf(std::vector<uint8_t>* buf, int data) { |
| buf->push_back(data & 0xff); |
| buf->push_back((data >> 8) & 0xff); |
| } |
| |
| template <typename Elf_Word, typename Elf_Sword, typename Elf_Addr, |
| typename Elf_Dyn, typename Elf_Sym, typename Elf_Ehdr, |
| typename Elf_Phdr, typename Elf_Shdr> |
| bool ElfWriterQuick<Elf_Word, Elf_Sword, Elf_Addr, Elf_Dyn, |
| Elf_Sym, Elf_Ehdr, Elf_Phdr, Elf_Shdr>::Create(File* elf_file, |
| OatWriter* oat_writer, |
| const std::vector<const DexFile*>& dex_files, |
| const std::string& android_root, |
| bool is_host, |
| const CompilerDriver& driver) { |
| ElfWriterQuick elf_writer(driver, elf_file); |
| return elf_writer.Write(oat_writer, dex_files, android_root, is_host); |
| } |
| |
| std::vector<uint8_t>* ConstructCIEFrameX86(bool is_x86_64) { |
| std::vector<uint8_t>* cfi_info = new std::vector<uint8_t>; |
| |
| // Length (will be filled in later in this routine). |
| if (is_x86_64) { |
| Push32(cfi_info, 0xffffffff); // Indicates 64bit |
| Push32(cfi_info, 0); |
| Push32(cfi_info, 0); |
| } else { |
| Push32(cfi_info, 0); |
| } |
| |
| // CIE id: always 0. |
| if (is_x86_64) { |
| Push32(cfi_info, 0); |
| Push32(cfi_info, 0); |
| } else { |
| Push32(cfi_info, 0); |
| } |
| |
| // Version: always 1. |
| cfi_info->push_back(0x01); |
| |
| // Augmentation: 'zR\0' |
| cfi_info->push_back(0x7a); |
| cfi_info->push_back(0x52); |
| cfi_info->push_back(0x0); |
| |
| // Code alignment: 1. |
| EncodeUnsignedLeb128(1, cfi_info); |
| |
| // Data alignment. |
| if (is_x86_64) { |
| EncodeSignedLeb128(-8, cfi_info); |
| } else { |
| EncodeSignedLeb128(-4, cfi_info); |
| } |
| |
| // Return address register. |
| if (is_x86_64) { |
| // R16(RIP) |
| cfi_info->push_back(0x10); |
| } else { |
| // R8(EIP) |
| cfi_info->push_back(0x08); |
| } |
| |
| // Augmentation length: 1. |
| cfi_info->push_back(1); |
| |
| // Augmentation data. |
| if (is_x86_64) { |
| // 0x04 ((DW_EH_PE_absptr << 4) | DW_EH_PE_udata8). |
| cfi_info->push_back(0x04); |
| } else { |
| // 0x03 ((DW_EH_PE_absptr << 4) | DW_EH_PE_udata4). |
| cfi_info->push_back(0x03); |
| } |
| |
| // Initial instructions. |
| if (is_x86_64) { |
| // DW_CFA_def_cfa R7(RSP) 8. |
| cfi_info->push_back(0x0c); |
| cfi_info->push_back(0x07); |
| cfi_info->push_back(0x08); |
| |
| // DW_CFA_offset R16(RIP) 1 (* -8). |
| cfi_info->push_back(0x90); |
| cfi_info->push_back(0x01); |
| } else { |
| // DW_CFA_def_cfa R4(ESP) 4. |
| cfi_info->push_back(0x0c); |
| cfi_info->push_back(0x04); |
| cfi_info->push_back(0x04); |
| |
| // DW_CFA_offset R8(EIP) 1 (* -4). |
| cfi_info->push_back(0x88); |
| cfi_info->push_back(0x01); |
| } |
| |
| // Padding to a multiple of 4 |
| while ((cfi_info->size() & 3) != 0) { |
| // DW_CFA_nop is encoded as 0. |
| cfi_info->push_back(0); |
| } |
| |
| // Set the length of the CIE inside the generated bytes. |
| if (is_x86_64) { |
| uint32_t length = cfi_info->size() - 12; |
| UpdateWord(cfi_info, 4, length); |
| } else { |
| uint32_t length = cfi_info->size() - 4; |
| UpdateWord(cfi_info, 0, length); |
| } |
| return cfi_info; |
| } |
| |
| std::vector<uint8_t>* ConstructCIEFrame(InstructionSet isa) { |
| switch (isa) { |
| case kX86: |
| return ConstructCIEFrameX86(false); |
| case kX86_64: |
| return ConstructCIEFrameX86(true); |
| |
| default: |
| // Not implemented. |
| return nullptr; |
| } |
| } |
| |
| class OatWriterWrapper FINAL : public CodeOutput { |
| public: |
| explicit OatWriterWrapper(OatWriter* oat_writer) : oat_writer_(oat_writer) {} |
| |
| void SetCodeOffset(size_t offset) { |
| oat_writer_->SetOatDataOffset(offset); |
| } |
| bool Write(OutputStream* out) OVERRIDE { |
| return oat_writer_->Write(out); |
| } |
| private: |
| OatWriter* const oat_writer_; |
| }; |
| |
| template <typename Elf_Word, typename Elf_Sword, typename Elf_Addr, |
| typename Elf_Dyn, typename Elf_Sym, typename Elf_Ehdr, |
| typename Elf_Phdr, typename Elf_Shdr> |
| static void WriteDebugSymbols(const CompilerDriver* compiler_driver, |
| ElfBuilder<Elf_Word, Elf_Sword, Elf_Addr, Elf_Dyn, |
| Elf_Sym, Elf_Ehdr, Elf_Phdr, Elf_Shdr>* builder, |
| OatWriter* oat_writer); |
| |
| template <typename Elf_Word, typename Elf_Sword, typename Elf_Addr, |
| typename Elf_Dyn, typename Elf_Sym, typename Elf_Ehdr, |
| typename Elf_Phdr, typename Elf_Shdr> |
| bool ElfWriterQuick<Elf_Word, Elf_Sword, Elf_Addr, Elf_Dyn, |
| Elf_Sym, Elf_Ehdr, Elf_Phdr, Elf_Shdr>::Write(OatWriter* oat_writer, |
| const std::vector<const DexFile*>& dex_files_unused ATTRIBUTE_UNUSED, |
| const std::string& android_root_unused ATTRIBUTE_UNUSED, |
| bool is_host_unused ATTRIBUTE_UNUSED) { |
| constexpr bool debug = false; |
| const OatHeader& oat_header = oat_writer->GetOatHeader(); |
| Elf_Word oat_data_size = oat_header.GetExecutableOffset(); |
| uint32_t oat_exec_size = oat_writer->GetSize() - oat_data_size; |
| uint32_t oat_bss_size = oat_writer->GetBssSize(); |
| |
| OatWriterWrapper wrapper(oat_writer); |
| |
| std::unique_ptr<ElfBuilder<Elf_Word, Elf_Sword, Elf_Addr, Elf_Dyn, |
| Elf_Sym, Elf_Ehdr, Elf_Phdr, Elf_Shdr> > builder( |
| new ElfBuilder<Elf_Word, Elf_Sword, Elf_Addr, Elf_Dyn, |
| Elf_Sym, Elf_Ehdr, Elf_Phdr, Elf_Shdr>( |
| &wrapper, |
| elf_file_, |
| compiler_driver_->GetInstructionSet(), |
| 0, |
| oat_data_size, |
| oat_data_size, |
| oat_exec_size, |
| RoundUp(oat_data_size + oat_exec_size, kPageSize), |
| oat_bss_size, |
| compiler_driver_->GetCompilerOptions().GetIncludeDebugSymbols(), |
| debug)); |
| |
| if (!builder->Init()) { |
| return false; |
| } |
| |
| if (compiler_driver_->GetCompilerOptions().GetIncludeDebugSymbols()) { |
| WriteDebugSymbols(compiler_driver_, builder.get(), oat_writer); |
| } |
| |
| if (compiler_driver_->GetCompilerOptions().GetIncludePatchInformation()) { |
| ElfRawSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr> oat_patches( |
| ".oat_patches", SHT_OAT_PATCH, 0, NULL, 0, sizeof(uintptr_t), sizeof(uintptr_t)); |
| const std::vector<uintptr_t>& locations = oat_writer->GetAbsolutePatchLocations(); |
| const uint8_t* begin = reinterpret_cast<const uint8_t*>(&locations[0]); |
| const uint8_t* end = begin + locations.size() * sizeof(locations[0]); |
| oat_patches.GetBuffer()->assign(begin, end); |
| if (debug) { |
| LOG(INFO) << "Prepared .oat_patches for " << locations.size() << " patches."; |
| } |
| builder->RegisterRawSection(oat_patches); |
| } |
| |
| return builder->Write(); |
| } |
| |
| // TODO: rewriting it using DexFile::DecodeDebugInfo needs unneeded stuff. |
| static void GetLineInfoForJava(const uint8_t* dbgstream, DefaultSrcMap* dex2line) { |
| if (dbgstream == nullptr) { |
| return; |
| } |
| |
| int adjopcode; |
| uint32_t dex_offset = 0; |
| uint32_t java_line = DecodeUnsignedLeb128(&dbgstream); |
| |
| // skip parameters |
| for (uint32_t param_count = DecodeUnsignedLeb128(&dbgstream); param_count != 0; --param_count) { |
| DecodeUnsignedLeb128(&dbgstream); |
| } |
| |
| for (bool is_end = false; is_end == false; ) { |
| uint8_t opcode = *dbgstream; |
| dbgstream++; |
| switch (opcode) { |
| case DexFile::DBG_END_SEQUENCE: |
| is_end = true; |
| break; |
| |
| case DexFile::DBG_ADVANCE_PC: |
| dex_offset += DecodeUnsignedLeb128(&dbgstream); |
| break; |
| |
| case DexFile::DBG_ADVANCE_LINE: |
| java_line += DecodeSignedLeb128(&dbgstream); |
| break; |
| |
| case DexFile::DBG_START_LOCAL: |
| case DexFile::DBG_START_LOCAL_EXTENDED: |
| DecodeUnsignedLeb128(&dbgstream); |
| DecodeUnsignedLeb128(&dbgstream); |
| DecodeUnsignedLeb128(&dbgstream); |
| |
| if (opcode == DexFile::DBG_START_LOCAL_EXTENDED) { |
| DecodeUnsignedLeb128(&dbgstream); |
| } |
| break; |
| |
| case DexFile::DBG_END_LOCAL: |
| case DexFile::DBG_RESTART_LOCAL: |
| DecodeUnsignedLeb128(&dbgstream); |
| break; |
| |
| case DexFile::DBG_SET_PROLOGUE_END: |
| case DexFile::DBG_SET_EPILOGUE_BEGIN: |
| case DexFile::DBG_SET_FILE: |
| break; |
| |
| default: |
| adjopcode = opcode - DexFile::DBG_FIRST_SPECIAL; |
| dex_offset += adjopcode / DexFile::DBG_LINE_RANGE; |
| java_line += DexFile::DBG_LINE_BASE + (adjopcode % DexFile::DBG_LINE_RANGE); |
| dex2line->push_back({dex_offset, static_cast<int32_t>(java_line)}); |
| break; |
| } |
| } |
| } |
| |
| /* |
| * @brief Generate the DWARF debug_info and debug_abbrev sections |
| * @param oat_writer The Oat file Writer. |
| * @param dbg_info Compilation unit information. |
| * @param dbg_abbrev Abbreviations used to generate dbg_info. |
| * @param dbg_str Debug strings. |
| */ |
| static void FillInCFIInformation(OatWriter* oat_writer, |
| std::vector<uint8_t>* dbg_info, |
| std::vector<uint8_t>* dbg_abbrev, |
| std::vector<uint8_t>* dbg_str, |
| std::vector<uint8_t>* dbg_line, |
| uint32_t text_section_offset) { |
| const std::vector<OatWriter::DebugInfo>& method_infos = oat_writer->GetCFIMethodInfo(); |
| |
| uint32_t producer_str_offset = PushStr(dbg_str, "Android dex2oat"); |
| |
| constexpr bool use_64bit_addresses = false; |
| |
| // Create the debug_abbrev section with boilerplate information. |
| // We only care about low_pc and high_pc right now for the compilation |
| // unit and methods. |
| |
| // Tag 1: Compilation unit: DW_TAG_compile_unit. |
| PushByte(dbg_abbrev, 1); |
| PushByte(dbg_abbrev, dwarf::DW_TAG_compile_unit); |
| |
| // There are children (the methods). |
| PushByte(dbg_abbrev, dwarf::DW_CHILDREN_yes); |
| |
| // DW_AT_producer DW_FORM_data1. |
| // REVIEW: we can get rid of dbg_str section if |
| // DW_FORM_string (immediate string) was used everywhere instead of |
| // DW_FORM_strp (ref to string from .debug_str section). |
| // DW_FORM_strp makes sense only if we reuse the strings. |
| PushByte(dbg_abbrev, dwarf::DW_AT_producer); |
| PushByte(dbg_abbrev, dwarf::DW_FORM_strp); |
| |
| // DW_LANG_Java DW_FORM_data1. |
| PushByte(dbg_abbrev, dwarf::DW_AT_language); |
| PushByte(dbg_abbrev, dwarf::DW_FORM_data1); |
| |
| // DW_AT_low_pc DW_FORM_addr. |
| PushByte(dbg_abbrev, dwarf::DW_AT_low_pc); |
| PushByte(dbg_abbrev, dwarf::DW_FORM_addr); |
| |
| // DW_AT_high_pc DW_FORM_addr. |
| PushByte(dbg_abbrev, dwarf::DW_AT_high_pc); |
| PushByte(dbg_abbrev, dwarf::DW_FORM_addr); |
| |
| if (dbg_line != nullptr) { |
| // DW_AT_stmt_list DW_FORM_sec_offset. |
| PushByte(dbg_abbrev, dwarf::DW_AT_stmt_list); |
| PushByte(dbg_abbrev, dwarf::DW_FORM_data4); |
| } |
| |
| // End of DW_TAG_compile_unit. |
| PushByte(dbg_abbrev, 0); // DW_AT. |
| PushByte(dbg_abbrev, 0); // DW_FORM. |
| |
| // Tag 2: Compilation unit: DW_TAG_subprogram. |
| PushByte(dbg_abbrev, 2); |
| PushByte(dbg_abbrev, dwarf::DW_TAG_subprogram); |
| |
| // There are no children. |
| PushByte(dbg_abbrev, dwarf::DW_CHILDREN_no); |
| |
| // Name of the method. |
| PushByte(dbg_abbrev, dwarf::DW_AT_name); |
| PushByte(dbg_abbrev, dwarf::DW_FORM_strp); |
| |
| // DW_AT_low_pc DW_FORM_addr. |
| PushByte(dbg_abbrev, dwarf::DW_AT_low_pc); |
| PushByte(dbg_abbrev, dwarf::DW_FORM_addr); |
| |
| // DW_AT_high_pc DW_FORM_addr. |
| PushByte(dbg_abbrev, dwarf::DW_AT_high_pc); |
| PushByte(dbg_abbrev, dwarf::DW_FORM_addr); |
| |
| // End of DW_TAG_subprogram. |
| PushByte(dbg_abbrev, 0); // DW_AT. |
| PushByte(dbg_abbrev, 0); // DW_FORM. |
| |
| // End of abbrevs for compilation unit |
| PushByte(dbg_abbrev, 0); |
| |
| // Start the debug_info section with the header information |
| // 'unit_length' will be filled in later. |
| int cunit_length = dbg_info->size(); |
| Push32(dbg_info, 0); |
| |
| // 'version' - 3. |
| PushHalf(dbg_info, 3); |
| |
| // Offset into .debug_abbrev section (always 0). |
| Push32(dbg_info, 0); |
| |
| // Address size: 4 or 8. |
| PushByte(dbg_info, use_64bit_addresses ? 8 : 4); |
| |
| // Start the description for the compilation unit. |
| // This uses tag 1. |
| PushByte(dbg_info, 1); |
| |
| // The producer is Android dex2oat. |
| Push32(dbg_info, producer_str_offset); |
| |
| // The language is Java. |
| PushByte(dbg_info, dwarf::DW_LANG_Java); |
| |
| // low_pc and high_pc. |
| uint32_t cunit_low_pc = static_cast<uint32_t>(-1); |
| uint32_t cunit_high_pc = 0; |
| for (auto method_info : method_infos) { |
| cunit_low_pc = std::min(cunit_low_pc, method_info.low_pc_); |
| cunit_high_pc = std::max(cunit_high_pc, method_info.high_pc_); |
| } |
| Push32(dbg_info, cunit_low_pc + text_section_offset); |
| Push32(dbg_info, cunit_high_pc + text_section_offset); |
| |
| if (dbg_line != nullptr) { |
| // Line number table offset. |
| Push32(dbg_info, dbg_line->size()); |
| } |
| |
| for (auto method_info : method_infos) { |
| // Start a new TAG: subroutine (2). |
| PushByte(dbg_info, 2); |
| |
| // Enter name, low_pc, high_pc. |
| Push32(dbg_info, PushStr(dbg_str, method_info.method_name_)); |
| Push32(dbg_info, method_info.low_pc_ + text_section_offset); |
| Push32(dbg_info, method_info.high_pc_ + text_section_offset); |
| } |
| |
| if (dbg_line != nullptr) { |
| // TODO: in gdb info functions <regexp> - reports Java functions, but |
| // source file is <unknown> because .debug_line is formed as one |
| // compilation unit. To fix this it is possible to generate |
| // a separate compilation unit for every distinct Java source. |
| // Each of the these compilation units can have several non-adjacent |
| // method ranges. |
| |
| std::vector<dwarf::DebugLineWriter<>::FileEntry> files; |
| std::unordered_map<std::string, size_t> files_map; |
| std::vector<std::string> directories; |
| std::unordered_map<std::string, size_t> directories_map; |
| |
| int code_factor_bits_ = 0; |
| int isa = -1; |
| switch (oat_writer->GetOatHeader().GetInstructionSet()) { |
| case kThumb2: |
| code_factor_bits_ = 1; // 16-bit instuctions |
| isa = 1; // DW_ISA_ARM_thumb. |
| break; |
| case kArm: |
| code_factor_bits_ = 1; // 16-bit instructions |
| isa = 2; // DW_ISA_ARM_arm. |
| break; |
| case kArm64: |
| case kMips: |
| case kMips64: |
| code_factor_bits_ = 2; // 32-bit instructions |
| break; |
| case kNone: |
| case kX86: |
| case kX86_64: |
| break; |
| } |
| |
| dwarf::DebugLineOpCodeWriter<> opcodes(use_64bit_addresses, code_factor_bits_); |
| opcodes.SetAddress(text_section_offset + cunit_low_pc); |
| if (isa != -1) { |
| opcodes.SetISA(isa); |
| } |
| DefaultSrcMap dex2line_map; |
| for (size_t i = 0; i < method_infos.size(); i++) { |
| const OatWriter::DebugInfo& method_info = method_infos[i]; |
| |
| // Addresses in the line table should be unique and increasing. |
| if (method_info.deduped_) { |
| continue; |
| } |
| |
| // Get and deduplicate directory and filename. |
| int file_index = 0; // 0 - primary source file of the compilation. |
| if (method_info.src_file_name_ != nullptr) { |
| std::string file_name(method_info.src_file_name_); |
| size_t file_name_slash = file_name.find_last_of('/'); |
| std::string class_name(method_info.class_descriptor_); |
| size_t class_name_slash = class_name.find_last_of('/'); |
| std::string full_path(file_name); |
| |
| // Guess directory from package name. |
| int directory_index = 0; // 0 - current directory of the compilation. |
| if (file_name_slash == std::string::npos && // Just filename. |
| class_name.front() == 'L' && // Type descriptor for a class. |
| class_name_slash != std::string::npos) { // Has package name. |
| std::string package_name = class_name.substr(1, class_name_slash - 1); |
| auto it = directories_map.find(package_name); |
| if (it == directories_map.end()) { |
| directory_index = 1 + directories.size(); |
| directories_map.emplace(package_name, directory_index); |
| directories.push_back(package_name); |
| } else { |
| directory_index = it->second; |
| } |
| full_path = package_name + "/" + file_name; |
| } |
| |
| // Add file entry. |
| auto it2 = files_map.find(full_path); |
| if (it2 == files_map.end()) { |
| file_index = 1 + files.size(); |
| files_map.emplace(full_path, file_index); |
| files.push_back(dwarf::DebugLineWriter<>::FileEntry { |
| file_name, |
| directory_index, |
| 0, // Modification time - NA. |
| 0, // File size - NA. |
| }); |
| } else { |
| file_index = it2->second; |
| } |
| } |
| opcodes.SetFile(file_index); |
| |
| // Generate mapping opcodes from PC to Java lines. |
| dex2line_map.clear(); |
| GetLineInfoForJava(method_info.dbgstream_, &dex2line_map); |
| uint32_t low_pc = text_section_offset + method_info.low_pc_; |
| if (file_index != 0 && !dex2line_map.empty()) { |
| bool first = true; |
| for (SrcMapElem pc2dex : method_info.compiled_method_->GetSrcMappingTable()) { |
| uint32_t pc = pc2dex.from_; |
| int dex = pc2dex.to_; |
| auto dex2line = dex2line_map.Find(static_cast<uint32_t>(dex)); |
| if (dex2line.first) { |
| int line = dex2line.second; |
| if (first) { |
| first = false; |
| if (pc > 0) { |
| // Assume that any preceding code is prologue. |
| int first_line = dex2line_map.front().to_; |
| // Prologue is not a sensible place for a breakpoint. |
| opcodes.NegateStmt(); |
| opcodes.AddRow(low_pc, first_line); |
| opcodes.NegateStmt(); |
| opcodes.SetPrologueEnd(); |
| } |
| opcodes.AddRow(low_pc + pc, line); |
| } else if (line != opcodes.CurrentLine()) { |
| opcodes.AddRow(low_pc + pc, line); |
| } |
| } |
| } |
| } else { |
| // line 0 - instruction cannot be attributed to any source line. |
| opcodes.AddRow(low_pc, 0); |
| } |
| } |
| |
| opcodes.AdvancePC(text_section_offset + cunit_high_pc); |
| opcodes.EndSequence(); |
| |
| dwarf::DebugLineWriter<> dbg_line_writer(dbg_line); |
| dbg_line_writer.WriteTable(directories, files, opcodes); |
| } |
| |
| // One byte terminator. |
| PushByte(dbg_info, 0); |
| |
| // We have now walked all the methods. Fill in lengths. |
| UpdateWord(dbg_info, cunit_length, dbg_info->size() - cunit_length - 4); |
| } |
| |
| template <typename Elf_Word, typename Elf_Sword, typename Elf_Addr, |
| typename Elf_Dyn, typename Elf_Sym, typename Elf_Ehdr, |
| typename Elf_Phdr, typename Elf_Shdr> |
| // Do not inline to avoid Clang stack frame problems. b/18738594 |
| NO_INLINE |
| static void WriteDebugSymbols(const CompilerDriver* compiler_driver, |
| ElfBuilder<Elf_Word, Elf_Sword, Elf_Addr, Elf_Dyn, |
| Elf_Sym, Elf_Ehdr, Elf_Phdr, Elf_Shdr>* builder, |
| OatWriter* oat_writer) { |
| std::unique_ptr<std::vector<uint8_t>> cfi_info( |
| ConstructCIEFrame(compiler_driver->GetInstructionSet())); |
| |
| Elf_Addr text_section_address = builder->GetTextBuilder().GetSection()->sh_addr; |
| |
| // Iterate over the compiled methods. |
| const std::vector<OatWriter::DebugInfo>& method_info = oat_writer->GetCFIMethodInfo(); |
| ElfSymtabBuilder<Elf_Word, Elf_Sword, Elf_Addr, Elf_Sym, Elf_Shdr>* symtab = |
| builder->GetSymtabBuilder(); |
| for (auto it = method_info.begin(); it != method_info.end(); ++it) { |
| uint32_t low_pc = it->low_pc_; |
| // Add in code delta, e.g., thumb bit 0 for Thumb2 code. |
| low_pc += it->compiled_method_->CodeDelta(); |
| symtab->AddSymbol(it->method_name_, &builder->GetTextBuilder(), low_pc, |
| true, it->high_pc_ - it->low_pc_, STB_GLOBAL, STT_FUNC); |
| |
| // Conforming to aaelf, add $t mapping symbol to indicate start of a sequence of thumb2 |
| // instructions, so that disassembler tools can correctly disassemble. |
| if (it->compiled_method_->GetInstructionSet() == kThumb2) { |
| symtab->AddSymbol("$t", &builder->GetTextBuilder(), it->low_pc_ & ~1, true, |
| 0, STB_LOCAL, STT_NOTYPE); |
| } |
| |
| // Include CFI for compiled method, if possible. |
| if (cfi_info.get() != nullptr) { |
| DCHECK(it->compiled_method_ != nullptr); |
| |
| // Copy in the FDE, if present |
| const SwapVector<uint8_t>* fde = it->compiled_method_->GetCFIInfo(); |
| if (fde != nullptr) { |
| // Copy the information into cfi_info and then fix the address in the new copy. |
| int cur_offset = cfi_info->size(); |
| cfi_info->insert(cfi_info->end(), fde->begin(), fde->end()); |
| |
| bool is_64bit = *(reinterpret_cast<const uint32_t*>(fde->data())) == 0xffffffff; |
| |
| // Set the 'CIE_pointer' field. |
| uint64_t CIE_pointer = cur_offset + (is_64bit ? 12 : 4); |
| uint64_t offset_to_update = CIE_pointer; |
| if (is_64bit) { |
| (*cfi_info)[offset_to_update+0] = CIE_pointer; |
| (*cfi_info)[offset_to_update+1] = CIE_pointer >> 8; |
| (*cfi_info)[offset_to_update+2] = CIE_pointer >> 16; |
| (*cfi_info)[offset_to_update+3] = CIE_pointer >> 24; |
| (*cfi_info)[offset_to_update+4] = CIE_pointer >> 32; |
| (*cfi_info)[offset_to_update+5] = CIE_pointer >> 40; |
| (*cfi_info)[offset_to_update+6] = CIE_pointer >> 48; |
| (*cfi_info)[offset_to_update+7] = CIE_pointer >> 56; |
| } else { |
| (*cfi_info)[offset_to_update+0] = CIE_pointer; |
| (*cfi_info)[offset_to_update+1] = CIE_pointer >> 8; |
| (*cfi_info)[offset_to_update+2] = CIE_pointer >> 16; |
| (*cfi_info)[offset_to_update+3] = CIE_pointer >> 24; |
| } |
| |
| // Set the 'initial_location' field. |
| offset_to_update += is_64bit ? 8 : 4; |
| if (is_64bit) { |
| const uint64_t quick_code_start = it->low_pc_ + text_section_address; |
| (*cfi_info)[offset_to_update+0] = quick_code_start; |
| (*cfi_info)[offset_to_update+1] = quick_code_start >> 8; |
| (*cfi_info)[offset_to_update+2] = quick_code_start >> 16; |
| (*cfi_info)[offset_to_update+3] = quick_code_start >> 24; |
| (*cfi_info)[offset_to_update+4] = quick_code_start >> 32; |
| (*cfi_info)[offset_to_update+5] = quick_code_start >> 40; |
| (*cfi_info)[offset_to_update+6] = quick_code_start >> 48; |
| (*cfi_info)[offset_to_update+7] = quick_code_start >> 56; |
| } else { |
| const uint32_t quick_code_start = it->low_pc_ + text_section_address; |
| (*cfi_info)[offset_to_update+0] = quick_code_start; |
| (*cfi_info)[offset_to_update+1] = quick_code_start >> 8; |
| (*cfi_info)[offset_to_update+2] = quick_code_start >> 16; |
| (*cfi_info)[offset_to_update+3] = quick_code_start >> 24; |
| } |
| } |
| } |
| } |
| |
| bool hasCFI = (cfi_info.get() != nullptr); |
| bool hasLineInfo = false; |
| for (auto& dbg_info : oat_writer->GetCFIMethodInfo()) { |
| if (dbg_info.dbgstream_ != nullptr && |
| !dbg_info.compiled_method_->GetSrcMappingTable().empty()) { |
| hasLineInfo = true; |
| break; |
| } |
| } |
| |
| if (hasLineInfo || hasCFI) { |
| ElfRawSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr> debug_info(".debug_info", |
| SHT_PROGBITS, |
| 0, nullptr, 0, 1, 0); |
| ElfRawSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr> debug_abbrev(".debug_abbrev", |
| SHT_PROGBITS, |
| 0, nullptr, 0, 1, 0); |
| ElfRawSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr> debug_str(".debug_str", |
| SHT_PROGBITS, |
| 0, nullptr, 0, 1, 0); |
| ElfRawSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr> debug_line(".debug_line", |
| SHT_PROGBITS, |
| 0, nullptr, 0, 1, 0); |
| |
| FillInCFIInformation(oat_writer, debug_info.GetBuffer(), |
| debug_abbrev.GetBuffer(), debug_str.GetBuffer(), |
| hasLineInfo ? debug_line.GetBuffer() : nullptr, |
| text_section_address); |
| |
| builder->RegisterRawSection(debug_info); |
| builder->RegisterRawSection(debug_abbrev); |
| |
| if (hasCFI) { |
| ElfRawSectionBuilder<Elf_Word, Elf_Sword, Elf_Shdr> eh_frame(".eh_frame", |
| SHT_PROGBITS, |
| SHF_ALLOC, |
| nullptr, 0, 4, 0); |
| eh_frame.SetBuffer(std::move(*cfi_info.get())); |
| builder->RegisterRawSection(eh_frame); |
| } |
| |
| if (hasLineInfo) { |
| builder->RegisterRawSection(debug_line); |
| } |
| |
| builder->RegisterRawSection(debug_str); |
| } |
| } |
| |
| // Explicit instantiations |
| template class ElfWriterQuick<Elf32_Word, Elf32_Sword, Elf32_Addr, Elf32_Dyn, |
| Elf32_Sym, Elf32_Ehdr, Elf32_Phdr, Elf32_Shdr>; |
| template class ElfWriterQuick<Elf64_Word, Elf64_Sword, Elf64_Addr, Elf64_Dyn, |
| Elf64_Sym, Elf64_Ehdr, Elf64_Phdr, Elf64_Shdr>; |
| |
| } // namespace art |
