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Diffstat (limited to 'compiler/debug/elf_debug_reader.h')
| -rw-r--r-- | compiler/debug/elf_debug_reader.h | 173 |
1 files changed, 0 insertions, 173 deletions
diff --git a/compiler/debug/elf_debug_reader.h b/compiler/debug/elf_debug_reader.h deleted file mode 100644 index 1820e7cdc7..0000000000 --- a/compiler/debug/elf_debug_reader.h +++ /dev/null @@ -1,173 +0,0 @@ -/* - * Copyright (C) 2018 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_DEBUG_ELF_DEBUG_READER_H_ -#define ART_COMPILER_DEBUG_ELF_DEBUG_READER_H_ - -#include "base/array_ref.h" -#include "debug/dwarf/headers.h" -#include "elf.h" -#include "xz_utils.h" - -#include <map> -#include <string_view> - -namespace art { -namespace debug { - -// Trivial ELF file reader. -// -// It is the bare minimum needed to read mini-debug-info symbols for unwinding. -// We use it to merge JIT mini-debug-infos together or to prune them after GC. -template <typename ElfTypes> -class ElfDebugReader { - public: - // Note that the input buffer might be misaligned. - typedef typename ElfTypes::Ehdr ALIGNED(1) Elf_Ehdr; - typedef typename ElfTypes::Shdr ALIGNED(1) Elf_Shdr; - typedef typename ElfTypes::Sym ALIGNED(1) Elf_Sym; - typedef typename ElfTypes::Addr ALIGNED(1) Elf_Addr; - - // Call Frame Information. - struct CFI { - uint32_t length; // Length excluding the size of this field. - int32_t cie_pointer; // Offset in the section or -1 for CIE. - - const uint8_t* data() const { return reinterpret_cast<const uint8_t*>(this); } - size_t size() const { return sizeof(uint32_t) + length; } - } PACKED(1); - - // Common Information Entry. - struct CIE : public CFI { - } PACKED(1); - - // Frame Description Entry. - struct FDE : public CFI { - Elf_Addr sym_addr; - Elf_Addr sym_size; - } PACKED(1); - - explicit ElfDebugReader(ArrayRef<const uint8_t> file) : file_(file) { - header_ = Read<Elf_Ehdr>(/*offset=*/ 0); - CHECK(header_->checkMagic()); - CHECK_EQ(header_->e_ehsize, sizeof(Elf_Ehdr)); - CHECK_EQ(header_->e_shentsize, sizeof(Elf_Shdr)); - - // Find all ELF sections. - sections_ = Read<Elf_Shdr>(header_->e_shoff, header_->e_shnum); - for (const Elf_Shdr& section : sections_) { - const char* name = Read<char>(sections_[header_->e_shstrndx].sh_offset + section.sh_name); - section_map_[std::string_view(name)] = §ion; - } - - // Decompressed embedded debug symbols, if any. - const Elf_Shdr* gnu_debugdata = section_map_[".gnu_debugdata"]; - if (gnu_debugdata != nullptr) { - auto compressed = Read<uint8_t>(gnu_debugdata->sh_offset, gnu_debugdata->sh_size); - XzDecompress(compressed, &decompressed_gnu_debugdata_); - gnu_debugdata_reader_.reset(new ElfDebugReader(decompressed_gnu_debugdata_)); - } - } - - explicit ElfDebugReader(std::vector<uint8_t>& file) - : ElfDebugReader(ArrayRef<const uint8_t>(file)) { - } - - const Elf_Ehdr* GetHeader() { return header_; } - - ArrayRef<Elf_Shdr> GetSections() { return sections_; } - - const Elf_Shdr* GetSection(const char* name) { return section_map_[name]; } - - template <typename VisitSym> - void VisitFunctionSymbols(VisitSym visit_sym) { - const Elf_Shdr* symtab = GetSection(".symtab"); - const Elf_Shdr* strtab = GetSection(".strtab"); - const Elf_Shdr* text = GetSection(".text"); - if (symtab != nullptr && strtab != nullptr) { - CHECK_EQ(symtab->sh_entsize, sizeof(Elf_Sym)); - size_t count = symtab->sh_size / sizeof(Elf_Sym); - for (const Elf_Sym& symbol : Read<Elf_Sym>(symtab->sh_offset, count)) { - if (symbol.getType() == STT_FUNC && §ions_[symbol.st_shndx] == text) { - visit_sym(symbol, Read<char>(strtab->sh_offset + symbol.st_name)); - } - } - } - if (gnu_debugdata_reader_ != nullptr) { - gnu_debugdata_reader_->VisitFunctionSymbols(visit_sym); - } - } - - template <typename VisitSym> - void VisitDynamicSymbols(VisitSym visit_sym) { - const Elf_Shdr* dynsym = GetSection(".dynsym"); - const Elf_Shdr* dynstr = GetSection(".dynstr"); - if (dynsym != nullptr && dynstr != nullptr) { - CHECK_EQ(dynsym->sh_entsize, sizeof(Elf_Sym)); - size_t count = dynsym->sh_size / sizeof(Elf_Sym); - for (const Elf_Sym& symbol : Read<Elf_Sym>(dynsym->sh_offset, count)) { - visit_sym(symbol, Read<char>(dynstr->sh_offset + symbol.st_name)); - } - } - } - - template <typename VisitCIE, typename VisitFDE> - void VisitDebugFrame(VisitCIE visit_cie, VisitFDE visit_fde) { - const Elf_Shdr* debug_frame = GetSection(".debug_frame"); - if (debug_frame != nullptr) { - for (size_t offset = 0; offset < debug_frame->sh_size;) { - const CFI* entry = Read<CFI>(debug_frame->sh_offset + offset); - DCHECK_LE(entry->size(), debug_frame->sh_size - offset); - if (entry->cie_pointer == -1) { - visit_cie(Read<CIE>(debug_frame->sh_offset + offset)); - } else { - const FDE* fde = Read<FDE>(debug_frame->sh_offset + offset); - visit_fde(fde, Read<CIE>(debug_frame->sh_offset + fde->cie_pointer)); - } - offset += entry->size(); - } - } - if (gnu_debugdata_reader_ != nullptr) { - gnu_debugdata_reader_->VisitDebugFrame(visit_cie, visit_fde); - } - } - - private: - template<typename T> - const T* Read(size_t offset) { - DCHECK_LE(offset + sizeof(T), file_.size()); - return reinterpret_cast<const T*>(file_.data() + offset); - } - - template<typename T> - ArrayRef<const T> Read(size_t offset, size_t count) { - DCHECK_LE(offset + count * sizeof(T), file_.size()); - return ArrayRef<const T>(Read<T>(offset), count); - } - - ArrayRef<const uint8_t> const file_; - const Elf_Ehdr* header_; - ArrayRef<const Elf_Shdr> sections_; - std::unordered_map<std::string_view, const Elf_Shdr*> section_map_; - std::vector<uint8_t> decompressed_gnu_debugdata_; - std::unique_ptr<ElfDebugReader> gnu_debugdata_reader_; - - DISALLOW_COPY_AND_ASSIGN(ElfDebugReader); -}; - -} // namespace debug -} // namespace art -#endif // ART_COMPILER_DEBUG_ELF_DEBUG_READER_H_ |