compiler/debug/elf_debug_writer.cc - SHIFTPHONES/android_art - Gitiles

 /*
  * Copyright (C) 2016 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_debug_writer.h"

 #include <vector>

 #include "debug/dwarf/dwarf_constants.h"
 #include "debug/elf_compilation_unit.h"
 #include "debug/elf_debug_frame_writer.h"
 #include "debug/elf_debug_info_writer.h"
 #include "debug/elf_debug_line_writer.h"
 #include "debug/elf_debug_loc_writer.h"
 #include "debug/elf_gnu_debugdata_writer.h"
 #include "debug/elf_symtab_writer.h"
 #include "debug/method_debug_info.h"
 #include "elf_builder.h"
 #include "linker/vector_output_stream.h"
 #include "utils/array_ref.h"

 namespace art {
 namespace debug {

 template <typename ElfTypes>
 void WriteDebugInfo(ElfBuilder<ElfTypes>* builder,
                     const ArrayRef<const MethodDebugInfo>& method_infos,
                     dwarf::CFIFormat cfi_format,
                     bool write_oat_patches) {
   // Add methods to .symtab.
   WriteDebugSymbols(builder, method_infos, true /* with_signature */);
   // Generate CFI (stack unwinding information).
   WriteCFISection(builder, method_infos, cfi_format, write_oat_patches);
   // Write DWARF .debug_* sections.
   WriteDebugSections(builder, method_infos, write_oat_patches);
 }

 template<typename ElfTypes>
 static void WriteDebugSections(ElfBuilder<ElfTypes>* builder,
                                const ArrayRef<const MethodDebugInfo>& method_infos,
                                bool write_oat_patches) {
   // Group the methods into compilation units based on source file.
   std::vector<ElfCompilationUnit> compilation_units;
   const char* last_source_file = nullptr;
   for (const MethodDebugInfo& mi : method_infos) {
     auto& dex_class_def = mi.dex_file->GetClassDef(mi.class_def_index);
     const char* source_file = mi.dex_file->GetSourceFile(dex_class_def);
     if (compilation_units.empty() || source_file != last_source_file) {
       compilation_units.push_back(ElfCompilationUnit());
     }
     ElfCompilationUnit& cu = compilation_units.back();
     cu.methods.push_back(&mi);
     // All methods must have the same addressing mode otherwise the min/max below does not work.
     DCHECK_EQ(cu.methods.front()->is_code_address_text_relative, mi.is_code_address_text_relative);
     cu.is_code_address_text_relative = mi.is_code_address_text_relative;
     cu.code_address = std::min(cu.code_address, mi.code_address);
     cu.code_end = std::max(cu.code_end, mi.code_address + mi.code_size);
     last_source_file = source_file;
   }

   // Write .debug_line section.
   if (!compilation_units.empty()) {
     ElfDebugLineWriter<ElfTypes> line_writer(builder);
     line_writer.Start();
     for (auto& compilation_unit : compilation_units) {
       line_writer.WriteCompilationUnit(compilation_unit);
     }
     line_writer.End(write_oat_patches);
   }

   // Write .debug_info section.
   if (!compilation_units.empty()) {
     ElfDebugInfoWriter<ElfTypes> info_writer(builder);
     info_writer.Start();
     for (const auto& compilation_unit : compilation_units) {
       ElfCompilationUnitWriter<ElfTypes> cu_writer(&info_writer);
       cu_writer.Write(compilation_unit);
     }
     info_writer.End(write_oat_patches);
   }
 }

 std::vector<uint8_t> MakeMiniDebugInfo(
     InstructionSet isa,
     const InstructionSetFeatures* features,
     size_t rodata_size,
     size_t text_size,
     const ArrayRef<const MethodDebugInfo>& method_infos) {
   if (Is64BitInstructionSet(isa)) {
     return MakeMiniDebugInfoInternal<ElfTypes64>(isa,
                                                  features,
                                                  rodata_size,
                                                  text_size,
                                                  method_infos);
   } else {
     return MakeMiniDebugInfoInternal<ElfTypes32>(isa,
                                                  features,
                                                  rodata_size,
                                                  text_size,
                                                  method_infos);
   }
 }

 template <typename ElfTypes>
 static ArrayRef<const uint8_t> WriteDebugElfFileForMethodInternal(
     const InstructionSet isa,
     const InstructionSetFeatures* features,
     const MethodDebugInfo& method_info) {
   std::vector<uint8_t> buffer;
   buffer.reserve(KB);
   VectorOutputStream out("Debug ELF file", &buffer);
   std::unique_ptr<ElfBuilder<ElfTypes>> builder(new ElfBuilder<ElfTypes>(isa, features, &out));
   // No program headers since the ELF file is not linked and has no allocated sections.
   builder->Start(false /* write_program_headers */);
   WriteDebugInfo(builder.get(),
                  ArrayRef<const MethodDebugInfo>(&method_info, 1),
                  dwarf::DW_DEBUG_FRAME_FORMAT,
                  false /* write_oat_patches */);
   builder->End();
   CHECK(builder->Good());
   // Make a copy of the buffer.  We want to shrink it anyway.
   uint8_t* result = new uint8_t[buffer.size()];
   CHECK(result != nullptr);
   memcpy(result, buffer.data(), buffer.size());
   return ArrayRef<const uint8_t>(result, buffer.size());
 }

 ArrayRef<const uint8_t> WriteDebugElfFileForMethod(const InstructionSet isa,
                                                    const InstructionSetFeatures* features,
                                                    const MethodDebugInfo& method_info) {
   if (Is64BitInstructionSet(isa)) {
     return WriteDebugElfFileForMethodInternal<ElfTypes64>(isa, features, method_info);
   } else {
     return WriteDebugElfFileForMethodInternal<ElfTypes32>(isa, features, method_info);
   }
 }

 template <typename ElfTypes>
 static ArrayRef<const uint8_t> WriteDebugElfFileForClassesInternal(
     const InstructionSet isa,
     const InstructionSetFeatures* features,
     const ArrayRef<mirror::Class*>& types)
     SHARED_REQUIRES(Locks::mutator_lock_) {
   std::vector<uint8_t> buffer;
   buffer.reserve(KB);
   VectorOutputStream out("Debug ELF file", &buffer);
   std::unique_ptr<ElfBuilder<ElfTypes>> builder(new ElfBuilder<ElfTypes>(isa, features, &out));
   // No program headers since the ELF file is not linked and has no allocated sections.
   builder->Start(false /* write_program_headers */);
   ElfDebugInfoWriter<ElfTypes> info_writer(builder.get());
   info_writer.Start();
   ElfCompilationUnitWriter<ElfTypes> cu_writer(&info_writer);
   cu_writer.Write(types);
   info_writer.End(false /* write_oat_patches */);

   builder->End();
   CHECK(builder->Good());
   // Make a copy of the buffer.  We want to shrink it anyway.
   uint8_t* result = new uint8_t[buffer.size()];
   CHECK(result != nullptr);
   memcpy(result, buffer.data(), buffer.size());
   return ArrayRef<const uint8_t>(result, buffer.size());
 }

 ArrayRef<const uint8_t> WriteDebugElfFileForClasses(const InstructionSet isa,
                                                     const InstructionSetFeatures* features,
                                                     const ArrayRef<mirror::Class*>& types) {
   if (Is64BitInstructionSet(isa)) {
     return WriteDebugElfFileForClassesInternal<ElfTypes64>(isa, features, types);
   } else {
     return WriteDebugElfFileForClassesInternal<ElfTypes32>(isa, features, types);
   }
 }

 // Explicit instantiations
 template void WriteDebugInfo<ElfTypes32>(
     ElfBuilder<ElfTypes32>* builder,
     const ArrayRef<const MethodDebugInfo>& method_infos,
     dwarf::CFIFormat cfi_format,
     bool write_oat_patches);
 template void WriteDebugInfo<ElfTypes64>(
     ElfBuilder<ElfTypes64>* builder,
     const ArrayRef<const MethodDebugInfo>& method_infos,
     dwarf::CFIFormat cfi_format,
     bool write_oat_patches);

 }  // namespace debug
 }  // namespace art
	/*
	* Copyright (C) 2016 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_debug_writer.h"

	#include <vector>

	#include "debug/dwarf/dwarf_constants.h"
	#include "debug/elf_compilation_unit.h"
	#include "debug/elf_debug_frame_writer.h"
	#include "debug/elf_debug_info_writer.h"
	#include "debug/elf_debug_line_writer.h"
	#include "debug/elf_debug_loc_writer.h"
	#include "debug/elf_gnu_debugdata_writer.h"
	#include "debug/elf_symtab_writer.h"
	#include "debug/method_debug_info.h"
	#include "elf_builder.h"
	#include "linker/vector_output_stream.h"
	#include "utils/array_ref.h"

	namespace art {
	namespace debug {

	template <typename ElfTypes>
	void WriteDebugInfo(ElfBuilder<ElfTypes>* builder,
	const ArrayRef<const MethodDebugInfo>& method_infos,
	dwarf::CFIFormat cfi_format,
	bool write_oat_patches) {
	// Add methods to .symtab.
	WriteDebugSymbols(builder, method_infos, true /* with_signature */);
	// Generate CFI (stack unwinding information).
	WriteCFISection(builder, method_infos, cfi_format, write_oat_patches);
	// Write DWARF .debug_* sections.
	WriteDebugSections(builder, method_infos, write_oat_patches);
	}

	template<typename ElfTypes>
	static void WriteDebugSections(ElfBuilder<ElfTypes>* builder,
	const ArrayRef<const MethodDebugInfo>& method_infos,
	bool write_oat_patches) {
	// Group the methods into compilation units based on source file.
	std::vector<ElfCompilationUnit> compilation_units;
	const char* last_source_file = nullptr;
	for (const MethodDebugInfo& mi : method_infos) {
	auto& dex_class_def = mi.dex_file->GetClassDef(mi.class_def_index);
	const char* source_file = mi.dex_file->GetSourceFile(dex_class_def);
	if (compilation_units.empty() \|\| source_file != last_source_file) {
	compilation_units.push_back(ElfCompilationUnit());
	}
	ElfCompilationUnit& cu = compilation_units.back();
	cu.methods.push_back(&mi);
	// All methods must have the same addressing mode otherwise the min/max below does not work.
	DCHECK_EQ(cu.methods.front()->is_code_address_text_relative, mi.is_code_address_text_relative);
	cu.is_code_address_text_relative = mi.is_code_address_text_relative;
	cu.code_address = std::min(cu.code_address, mi.code_address);
	cu.code_end = std::max(cu.code_end, mi.code_address + mi.code_size);
	last_source_file = source_file;
	}

	// Write .debug_line section.
	if (!compilation_units.empty()) {
	ElfDebugLineWriter<ElfTypes> line_writer(builder);
	line_writer.Start();
	for (auto& compilation_unit : compilation_units) {
	line_writer.WriteCompilationUnit(compilation_unit);
	}
	line_writer.End(write_oat_patches);
	}

	// Write .debug_info section.
	if (!compilation_units.empty()) {
	ElfDebugInfoWriter<ElfTypes> info_writer(builder);
	info_writer.Start();
	for (const auto& compilation_unit : compilation_units) {
	ElfCompilationUnitWriter<ElfTypes> cu_writer(&info_writer);
	cu_writer.Write(compilation_unit);
	}
	info_writer.End(write_oat_patches);
	}
	}

	std::vector<uint8_t> MakeMiniDebugInfo(
	InstructionSet isa,
	const InstructionSetFeatures* features,
	size_t rodata_size,
	size_t text_size,
	const ArrayRef<const MethodDebugInfo>& method_infos) {
	if (Is64BitInstructionSet(isa)) {
	return MakeMiniDebugInfoInternal<ElfTypes64>(isa,
	features,
	rodata_size,
	text_size,
	method_infos);
	} else {
	return MakeMiniDebugInfoInternal<ElfTypes32>(isa,
	features,
	rodata_size,
	text_size,
	method_infos);
	}
	}

	template <typename ElfTypes>
	static ArrayRef<const uint8_t> WriteDebugElfFileForMethodInternal(
	const InstructionSet isa,
	const InstructionSetFeatures* features,
	const MethodDebugInfo& method_info) {
	std::vector<uint8_t> buffer;
	buffer.reserve(KB);
	VectorOutputStream out("Debug ELF file", &buffer);
	std::unique_ptr<ElfBuilder<ElfTypes>> builder(new ElfBuilder<ElfTypes>(isa, features, &out));
	// No program headers since the ELF file is not linked and has no allocated sections.
	builder->Start(false /* write_program_headers */);
	WriteDebugInfo(builder.get(),
	ArrayRef<const MethodDebugInfo>(&method_info, 1),
	dwarf::DW_DEBUG_FRAME_FORMAT,
	false /* write_oat_patches */);
	builder->End();
	CHECK(builder->Good());
	// Make a copy of the buffer. We want to shrink it anyway.
	uint8_t* result = new uint8_t[buffer.size()];
	CHECK(result != nullptr);
	memcpy(result, buffer.data(), buffer.size());
	return ArrayRef<const uint8_t>(result, buffer.size());
	}

	ArrayRef<const uint8_t> WriteDebugElfFileForMethod(const InstructionSet isa,
	const InstructionSetFeatures* features,
	const MethodDebugInfo& method_info) {
	if (Is64BitInstructionSet(isa)) {
	return WriteDebugElfFileForMethodInternal<ElfTypes64>(isa, features, method_info);
	} else {
	return WriteDebugElfFileForMethodInternal<ElfTypes32>(isa, features, method_info);
	}
	}

	template <typename ElfTypes>
	static ArrayRef<const uint8_t> WriteDebugElfFileForClassesInternal(
	const InstructionSet isa,
	const InstructionSetFeatures* features,
	const ArrayRef<mirror::Class*>& types)
	SHARED_REQUIRES(Locks::mutator_lock_) {
	std::vector<uint8_t> buffer;
	buffer.reserve(KB);
	VectorOutputStream out("Debug ELF file", &buffer);
	std::unique_ptr<ElfBuilder<ElfTypes>> builder(new ElfBuilder<ElfTypes>(isa, features, &out));
	// No program headers since the ELF file is not linked and has no allocated sections.
	builder->Start(false /* write_program_headers */);
	ElfDebugInfoWriter<ElfTypes> info_writer(builder.get());
	info_writer.Start();
	ElfCompilationUnitWriter<ElfTypes> cu_writer(&info_writer);
	cu_writer.Write(types);
	info_writer.End(false /* write_oat_patches */);

	builder->End();
	CHECK(builder->Good());
	// Make a copy of the buffer. We want to shrink it anyway.
	uint8_t* result = new uint8_t[buffer.size()];
	CHECK(result != nullptr);
	memcpy(result, buffer.data(), buffer.size());
	return ArrayRef<const uint8_t>(result, buffer.size());
	}

	ArrayRef<const uint8_t> WriteDebugElfFileForClasses(const InstructionSet isa,
	const InstructionSetFeatures* features,
	const ArrayRef<mirror::Class*>& types) {
	if (Is64BitInstructionSet(isa)) {
	return WriteDebugElfFileForClassesInternal<ElfTypes64>(isa, features, types);
	} else {
	return WriteDebugElfFileForClassesInternal<ElfTypes32>(isa, features, types);
	}
	}

	// Explicit instantiations
	template void WriteDebugInfo<ElfTypes32>(
	ElfBuilder<ElfTypes32>* builder,
	const ArrayRef<const MethodDebugInfo>& method_infos,
	dwarf::CFIFormat cfi_format,
	bool write_oat_patches);
	template void WriteDebugInfo<ElfTypes64>(
	ElfBuilder<ElfTypes64>* builder,
	const ArrayRef<const MethodDebugInfo>& method_infos,
	dwarf::CFIFormat cfi_format,
	bool write_oat_patches);

	} // namespace debug
	} // namespace art