Added submodule contents into tree
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4934 changed files with 1657477 additions and 5 deletions
232
externals/breakpad/src/common/dwarf/functioninfo.cc
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externals/breakpad/src/common/dwarf/functioninfo.cc
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// Copyright 2010 Google LLC
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google LLC nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// This is a client for the dwarf2reader to extract function and line
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// information from the debug info.
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#ifdef HAVE_CONFIG_H
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#include <config.h> // Must come first
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#endif
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#include <assert.h>
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#include <limits.h>
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#include <stdio.h>
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#include <map>
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#include <queue>
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#include <vector>
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#include "common/dwarf/functioninfo.h"
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#include "common/dwarf/bytereader.h"
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#include "common/scoped_ptr.h"
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#include "common/using_std_string.h"
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namespace google_breakpad {
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CULineInfoHandler::CULineInfoHandler(std::vector<SourceFileInfo>* files,
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std::vector<string>* dirs,
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LineMap* linemap):linemap_(linemap),
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files_(files),
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dirs_(dirs) {
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// In dwarf4, the dirs and files are 1 indexed, and in dwarf5 they are zero
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// indexed. This is handled in the LineInfo reader, so empty files are not
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// needed here.
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}
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void CULineInfoHandler::DefineDir(const string& name, uint32_t dir_num) {
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// These should never come out of order, actually
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assert(dir_num == dirs_->size());
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dirs_->push_back(name);
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}
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void CULineInfoHandler::DefineFile(const string& name,
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int32 file_num, uint32_t dir_num,
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uint64_t mod_time, uint64_t length) {
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assert(dir_num >= 0);
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assert(dir_num < dirs_->size());
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// These should never come out of order, actually.
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if (file_num == (int32)files_->size() || file_num == -1) {
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string dir = dirs_->at(dir_num);
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SourceFileInfo s;
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s.lowpc = ULLONG_MAX;
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if (dir == "") {
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s.name = name;
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} else {
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s.name = dir + "/" + name;
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}
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files_->push_back(s);
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} else {
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fprintf(stderr, "error in DefineFile");
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}
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}
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void CULineInfoHandler::AddLine(uint64_t address, uint64_t length,
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uint32_t file_num, uint32_t line_num,
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uint32_t column_num) {
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if (file_num < files_->size()) {
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linemap_->insert(
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std::make_pair(address,
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std::make_pair(files_->at(file_num).name.c_str(),
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line_num)));
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if (address < files_->at(file_num).lowpc) {
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files_->at(file_num).lowpc = address;
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}
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} else {
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fprintf(stderr, "error in AddLine");
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}
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}
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bool CUFunctionInfoHandler::StartCompilationUnit(uint64_t offset,
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uint8_t address_size,
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uint8_t offset_size,
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uint64_t cu_length,
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uint8_t dwarf_version) {
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current_compilation_unit_offset_ = offset;
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return true;
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}
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// For function info, we only care about subprograms and inlined
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// subroutines. For line info, the DW_AT_stmt_list lives in the
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// compile unit tag.
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bool CUFunctionInfoHandler::StartDIE(uint64_t offset, enum DwarfTag tag) {
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switch (tag) {
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case DW_TAG_subprogram:
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case DW_TAG_inlined_subroutine: {
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current_function_info_ = new FunctionInfo;
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current_function_info_->lowpc = current_function_info_->highpc = 0;
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current_function_info_->name = "";
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current_function_info_->line = 0;
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current_function_info_->file = "";
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offset_to_funcinfo_->insert(std::make_pair(offset,
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current_function_info_));
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};
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// FALLTHROUGH
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case DW_TAG_compile_unit:
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return true;
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default:
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return false;
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}
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return false;
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}
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// Only care about the name attribute for functions
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void CUFunctionInfoHandler::ProcessAttributeString(uint64_t offset,
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enum DwarfAttribute attr,
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enum DwarfForm form,
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const string& data) {
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if (current_function_info_) {
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if (attr == DW_AT_name)
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current_function_info_->name = data;
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else if (attr == DW_AT_MIPS_linkage_name)
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current_function_info_->mangled_name = data;
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}
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}
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void CUFunctionInfoHandler::ProcessAttributeUnsigned(uint64_t offset,
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enum DwarfAttribute attr,
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enum DwarfForm form,
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uint64_t data) {
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if (attr == DW_AT_stmt_list) {
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SectionMap::const_iterator iter =
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GetSectionByName(sections_, ".debug_line");
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assert(iter != sections_.end());
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scoped_ptr<LineInfo> lireader(new LineInfo(iter->second.first + data,
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iter->second.second - data,
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reader_, linehandler_));
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lireader->Start();
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} else if (current_function_info_) {
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switch (attr) {
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case DW_AT_low_pc:
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current_function_info_->lowpc = data;
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break;
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case DW_AT_high_pc:
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current_function_info_->highpc = data;
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break;
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case DW_AT_decl_line:
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current_function_info_->line = data;
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break;
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case DW_AT_decl_file:
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current_function_info_->file = files_->at(data).name;
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break;
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case DW_AT_ranges:
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current_function_info_->ranges = data;
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break;
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default:
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break;
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}
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}
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}
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void CUFunctionInfoHandler::ProcessAttributeReference(uint64_t offset,
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enum DwarfAttribute attr,
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enum DwarfForm form,
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uint64_t data) {
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if (current_function_info_) {
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switch (attr) {
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case DW_AT_specification: {
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// Some functions have a "specification" attribute
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// which means they were defined elsewhere. The name
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// attribute is not repeated, and must be taken from
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// the specification DIE. Here we'll assume that
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// any DIE referenced in this manner will already have
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// been seen, but that's not really required by the spec.
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FunctionMap::iterator iter = offset_to_funcinfo_->find(data);
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if (iter != offset_to_funcinfo_->end()) {
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current_function_info_->name = iter->second->name;
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current_function_info_->mangled_name = iter->second->mangled_name;
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} else {
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// If you hit this, this code probably needs to be rewritten.
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fprintf(stderr,
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"Error: DW_AT_specification was seen before the referenced "
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"DIE! (Looking for DIE at offset %08llx, in DIE at "
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"offset %08llx)\n", data, offset);
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}
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break;
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}
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default:
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break;
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}
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}
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}
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void CUFunctionInfoHandler::EndDIE(uint64_t offset) {
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if (current_function_info_ && current_function_info_->lowpc)
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address_to_funcinfo_->insert(std::make_pair(current_function_info_->lowpc,
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current_function_info_));
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}
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} // namespace google_breakpad
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