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// Copyright 2009 Google Inc. // // 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 "sawbuck/sym_util/symbol_cache.h" #include "base/strings/string_util.h" #include <dbghelp.h> namespace { template <size_t name_len> class SymbolInfo { public: SymbolInfo() { memset(buf_, 0, sizeof(buf_)); info_.SizeOfStruct = sizeof(info_); info_.MaxNameLen = name_len; } PSYMBOL_INFO get() { return &info_; } private: union { SYMBOL_INFO info_; char buf_[offsetof(SYMBOL_INFO, Name) + name_len * sizeof(wchar_t)]; }; }; } // namespace namespace sym_util { SymbolCache::SymbolCache() : initialized_(false) { // We use our own this pointer as process handle to ensure uniqueness // of handles passed to SymInitialize within our process. process_handle_ = reinterpret_cast<HANDLE>(this); DWORD options = ::SymGetOptions(); // Defer loading symbols until they're needed. options |= SYMOPT_DEFERRED_LOADS | SYMOPT_EXACT_SYMBOLS | SYMOPT_DEBUG; ::SymSetOptions(options); } SymbolCache::~SymbolCache() { Cleanup(); } bool SymbolCache::Initialize(size_t num_modules, ModuleInformation* modules) { const wchar_t* symbol_path = NULL; if (!symbol_path_.empty()) symbol_path = symbol_path_.c_str(); if (!::SymInitialize(process_handle_, symbol_path, FALSE)) return false; ::SymRegisterCallback64(process_handle_, SymbolCallback, reinterpret_cast<ULONG64>(this)); initialized_ = true; // Load the modules. for (size_t i = 0; i < num_modules; ++i) { modules_.push_back(modules[i]); DWORD64 load_base = ::SymLoadModuleEx(process_handle_, NULL, modules[i].image_file_name.c_str(), NULL, modules[i].base_address, modules[i].module_size, NULL, 0); } return true; } bool SymbolCache::GetSymbolForAddress(Address address, Symbol *symbol) { // Try the local cache first. SymbolMap::const_iterator it(cache_.find(address)); if (it != cache_.end()) { *symbol = it->second; return true; } IMAGEHLP_MODULE64 module = { sizeof(module) }; if (::SymGetModuleInfo64(process_handle_, address, &module)) { symbol->module = module.ImageName; symbol->module_base = module.BaseOfImage; } DWORD64 offset = 0; SymbolInfo<1024> sym_info; if (!::SymFromAddr(process_handle_, address, &offset, sym_info.get())) return false; symbol->name = sym_info.get()->Name; symbol->offset = static_cast<size_t>(offset); symbol->size = sym_info.get()->Size; // Lookup the unmagled name. DWORD options = ::SymGetOptions(); ::SymSetOptions((options | SYMOPT_PUBLICS_ONLY) & ~SYMOPT_UNDNAME); if (::SymFromAddr(process_handle_, address, &offset, sym_info.get())) symbol->mangled_name = sym_info.get()->Name; ::SymSetOptions(options); IMAGEHLP_LINE64 line_info = { sizeof(line_info) }; DWORD line_displacement = 0; if (::SymGetLineFromAddr64(process_handle_, address, &line_displacement, &line_info)) { symbol->file = line_info.FileName; symbol->line = line_info.LineNumber; } cache_.insert(std::make_pair(address, *symbol)); return true; } void SymbolCache::Cleanup() { if (initialized_) ::SymCleanup(process_handle_); initialized_ = false; } void SymbolCache::SetSymbolPath(const wchar_t* symbol_path) { if (symbol_path != NULL) symbol_path_ = symbol_path; else symbol_path_ = L""; if (initialized_) { // Switch the symbol path to the newly supplied one. ::SymSetSearchPath(process_handle_, symbol_path); // And flush the cache. cache_.clear(); } } // TODO(siggi): This callback needs cleaning up. Firstly anytime it sees // a proposed module, or when it thinks it's found a match in e.g. // systemroot or by prepending a drive letter, or whathever, it should // check that the module size, checksum and timestamp match. // Secondly, this really ought to be wired up to the status pane, // to let the user know whenever there's a potentially long-running // operation in progress. BOOL CALLBACK SymbolCache::SymbolCallback(HANDLE process, ULONG action, ULONG64 data, ULONG64 context) { SymbolCache* cache = reinterpret_cast<SymbolCache*>(context); switch (action) { case CBA_DEBUG_INFO: LOG(INFO) << "CBA_DEBUG_INFO(" << reinterpret_cast<const wchar_t*>(data) << ")"; break; case CBA_DEFERRED_SYMBOL_LOAD_CANCEL: // This is invoked a lot to query whether we'd like to cancel // out of the current symbol download. break; case CBA_DEFERRED_SYMBOL_LOAD_COMPLETE: { IMAGEHLP_DEFERRED_SYMBOL_LOAD64* loaded = reinterpret_cast<IMAGEHLP_DEFERRED_SYMBOL_LOAD64*>(data); if (!cache->status_callback_.is_null()) { std::wstring status(L"Loaded "); status.append(loaded->FileName); cache->status_callback_.Run(status.c_str()); } break; } case CBA_DEFERRED_SYMBOL_LOAD_FAILURE: { IMAGEHLP_DEFERRED_SYMBOL_LOAD64* loaded = reinterpret_cast<IMAGEHLP_DEFERRED_SYMBOL_LOAD64*>(data); LOG(INFO) << "CBA_DEFERRED_SYMBOL_LOAD_FAILURE(0x\n" << loaded->BaseOfImage << ")"; break; } case CBA_DEFERRED_SYMBOL_LOAD_PARTIAL: { IMAGEHLP_DEFERRED_SYMBOL_LOAD64* loaded = reinterpret_cast<IMAGEHLP_DEFERRED_SYMBOL_LOAD64*>(data); LOG(INFO) << "CBA_DEFERRED_SYMBOL_LOAD_PARTIAL(" << loaded->FileName << ")"; ModuleInformation info; if (cache->GetModuleInformation(loaded->BaseOfImage, &info)) { loaded->CheckSum = info.image_checksum; loaded->TimeDateStamp = info.time_date_stamp; loaded->Reparse = TRUE; return TRUE; } break; } case CBA_DEFERRED_SYMBOL_LOAD_START: { IMAGEHLP_DEFERRED_SYMBOL_LOAD64* loaded = reinterpret_cast<IMAGEHLP_DEFERRED_SYMBOL_LOAD64*>(data); LOG(INFO) << "CBA_DEFERRED_SYMBOL_LOAD_START(0x" << loaded->BaseOfImage << ")\n"; break; } case CBA_DUPLICATE_SYMBOL: LOG(INFO) << "CBA_DUPLICATE_SYMBOL"; break; case CBA_EVENT: { IMAGEHLP_CBA_EVENT* event = reinterpret_cast<IMAGEHLP_CBA_EVENT*>(data); LOG(INFO) << "CBA_EVENT(" << std::hex << event->code << ", " << event->desc << ")"; if (!cache->status_callback_.is_null()) cache->status_callback_.Run(event->desc); break; } case CBA_READ_MEMORY: { IMAGEHLP_CBA_READ_MEMORY* read_mem = reinterpret_cast<IMAGEHLP_CBA_READ_MEMORY*>(data); LOG(INFO) << "CBA_READ_MEMORY(" << reinterpret_cast<void*>(read_mem->addr) << ", " << read_mem->bytes; break; } case CBA_SET_OPTIONS: LOG(INFO) << "CBA_SET_OPTIONS"; break; // The SDK does not (yet) define these constants and structures. #if 0 case CBA_SRCSRV_EVENT: { IMAGEHLP_CBA_EVENT* event = reinterpret_cast<IMAGEHLP_CBA_EVENT*>(data); ATLTRACE(L"CBA_SRCSRV_EVENT(0x%08X, %s)\n", event->code, event->desc); break; } case CBA_SRCSRV_INFO: { ATLTRACE(L"CBA_SRCSRV_INFO: %s\n", reinterpret_cast<const char*>(data)); break; } #endif case CBA_SYMBOLS_UNLOADED: LOG(INFO) << "CBA_SYMBOLS_UNLOADED"; break; } return false; } bool SymbolCache::GetModuleInformation(Address load_address, ModuleInformation* info) { for (size_t i = 0; i < modules_.size(); ++i) { if (modules_[i].base_address == load_address) { *info = modules_[i]; return true; } } return false; } } // namespace sym_util
Original issue reported on code.google.com by morrisgi...@rocketmail.com on 1 Dec 2014 at 11:04
morrisgi...@rocketmail.com
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Original issue reported on code.google.com by
morrisgi...@rocketmail.comon 1 Dec 2014 at 11:04Attachments: