diff options
Diffstat (limited to 'toolkit/crashreporter/google-breakpad/src/common/linux/elf_symbols_to_module.cc')
| -rw-r--r-- | toolkit/crashreporter/google-breakpad/src/common/linux/elf_symbols_to_module.cc | 178 |
1 files changed, 0 insertions, 178 deletions
diff --git a/toolkit/crashreporter/google-breakpad/src/common/linux/elf_symbols_to_module.cc b/toolkit/crashreporter/google-breakpad/src/common/linux/elf_symbols_to_module.cc deleted file mode 100644 index 562875e11..000000000 --- a/toolkit/crashreporter/google-breakpad/src/common/linux/elf_symbols_to_module.cc +++ /dev/null @@ -1,178 +0,0 @@ -// -*- mode: c++ -*- - -// Copyright (c) 2011 Google Inc. All Rights Reserved. -// -// Redistribution and use in source and binary forms, with or without -// modification, are permitted provided that the following conditions are -// met: -// -// * Redistributions of source code must retain the above copyright -// notice, this list of conditions and the following disclaimer. -// * Redistributions in binary form must reproduce the above -// copyright notice, this list of conditions and the following disclaimer -// in the documentation and/or other materials provided with the -// distribution. -// * Neither the name of Google Inc. nor the names of its -// contributors may be used to endorse or promote products derived from -// this software without specific prior written permission. -// -// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - -// Original author: Ted Mielczarek <ted.mielczarek@gmail.com> - -#include "common/linux/elf_symbols_to_module.h" - -#include <cxxabi.h> -#include <elf.h> -#include <string.h> - -#include "common/byte_cursor.h" -#include "common/module.h" - -namespace google_breakpad { - -class ELFSymbolIterator { -public: - // The contents of an ELF symbol, adjusted for the host's endianness, - // word size, and so on. Corresponds to the data in Elf32_Sym / Elf64_Sym. - struct Symbol { - // True if this iterator has reached the end of the symbol array. When - // this is set, the other members of this structure are not valid. - bool at_end; - - // The number of this symbol within the list. - size_t index; - - // The current symbol's name offset. This is the offset within the - // string table. - size_t name_offset; - - // The current symbol's value, size, info and shndx fields. - uint64_t value; - uint64_t size; - unsigned char info; - uint16_t shndx; - }; - - // Create an ELFSymbolIterator walking the symbols in BUFFER. Treat the - // symbols as big-endian if BIG_ENDIAN is true, as little-endian - // otherwise. Assume each symbol has a 'value' field whose size is - // VALUE_SIZE. - // - ELFSymbolIterator(const ByteBuffer *buffer, bool big_endian, - size_t value_size) - : value_size_(value_size), cursor_(buffer, big_endian) { - // Actually, weird sizes could be handled just fine, but they're - // probably mistakes --- expressed in bits, say. - assert(value_size == 4 || value_size == 8); - symbol_.index = 0; - Fetch(); - } - - // Move to the next symbol. This function's behavior is undefined if - // at_end() is true when it is called. - ELFSymbolIterator &operator++() { Fetch(); symbol_.index++; return *this; } - - // Dereferencing this iterator produces a reference to an Symbol structure - // that holds the current symbol's values. The symbol is owned by this - // SymbolIterator, and will be invalidated at the next call to operator++. - const Symbol &operator*() const { return symbol_; } - const Symbol *operator->() const { return &symbol_; } - -private: - // Read the symbol at cursor_, and set symbol_ appropriately. - void Fetch() { - // Elf32_Sym and Elf64_Sym have different layouts. - unsigned char other; - if (value_size_ == 4) { - // Elf32_Sym - cursor_ - .Read(4, false, &symbol_.name_offset) - .Read(4, false, &symbol_.value) - .Read(4, false, &symbol_.size) - .Read(1, false, &symbol_.info) - .Read(1, false, &other) - .Read(2, false, &symbol_.shndx); - } else { - // Elf64_Sym - cursor_ - .Read(4, false, &symbol_.name_offset) - .Read(1, false, &symbol_.info) - .Read(1, false, &other) - .Read(2, false, &symbol_.shndx) - .Read(8, false, &symbol_.value) - .Read(8, false, &symbol_.size); - } - symbol_.at_end = !cursor_; - } - - // The size of symbols' value field, in bytes. - size_t value_size_; - - // A byte cursor traversing buffer_. - ByteCursor cursor_; - - // Values for the symbol this iterator refers to. - Symbol symbol_; -}; - -const char *SymbolString(ptrdiff_t offset, ByteBuffer& strings) { - if (offset < 0 || (size_t) offset >= strings.Size()) { - // Return the null string. - offset = 0; - } - return reinterpret_cast<const char *>(strings.start + offset); -} - -bool ELFSymbolsToModule(const uint8_t *symtab_section, - size_t symtab_size, - const uint8_t *string_section, - size_t string_size, - const bool big_endian, - size_t value_size, - Module *module) { - ByteBuffer symbols(symtab_section, symtab_size); - // Ensure that the string section is null-terminated. - if (string_section[string_size - 1] != '\0') { - const void* null_terminator = memrchr(string_section, '\0', string_size); - string_size = reinterpret_cast<const uint8_t*>(null_terminator) - - string_section; - } - ByteBuffer strings(string_section, string_size); - - // The iterator walking the symbol table. - ELFSymbolIterator iterator(&symbols, big_endian, value_size); - - while(!iterator->at_end) { - if (ELF32_ST_TYPE(iterator->info) == STT_FUNC && - iterator->shndx != SHN_UNDEF) { - Module::Extern *ext = new Module::Extern(iterator->value); - ext->name = SymbolString(iterator->name_offset, strings); -#if !defined(__ANDROID__) // Android NDK doesn't provide abi::__cxa_demangle. - int status = 0; - char* demangled = - abi::__cxa_demangle(ext->name.c_str(), NULL, NULL, &status); - if (demangled) { - if (status == 0) - ext->name = demangled; - free(demangled); - } -#endif - module->AddExtern(ext); - } - ++iterator; - } - return true; -} - -} // namespace google_breakpad |