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// Copyright (c) 2012 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.
// Implementation of StackFrameSymbolizer, which encapsulates the logic of how
// SourceLineResolverInterface interacts with SymbolSupplier to fill source
// line information in a stack frame, and also looks up WindowsFrameInfo or
// CFIFrameInfo for a stack frame.
#include "google_breakpad/processor/stack_frame_symbolizer.h"
#include <assert.h>
#include "common/scoped_ptr.h"
#include "google_breakpad/processor/code_module.h"
#include "google_breakpad/processor/code_modules.h"
#include "google_breakpad/processor/source_line_resolver_interface.h"
#include "google_breakpad/processor/stack_frame.h"
#include "google_breakpad/processor/symbol_supplier.h"
#include "google_breakpad/processor/system_info.h"
#include "processor/linked_ptr.h"
#include "processor/logging.h"
namespace google_breakpad {
StackFrameSymbolizer::StackFrameSymbolizer(
SymbolSupplier* supplier,
SourceLineResolverInterface* resolver) : supplier_(supplier),
resolver_(resolver) { }
StackFrameSymbolizer::SymbolizerResult StackFrameSymbolizer::FillSourceLineInfo(
const CodeModules* modules,
const CodeModules* unloaded_modules,
const SystemInfo* system_info,
StackFrame* frame) {
assert(frame);
const CodeModule* module = NULL;
if (modules) {
module = modules->GetModuleForAddress(frame->instruction);
}
if (!module && unloaded_modules) {
module = unloaded_modules->GetModuleForAddress(frame->instruction);
}
if (!module) return kError;
frame->module = module;
if (!resolver_) return kError; // no resolver.
// If module is known to have missing symbol file, return.
if (no_symbol_modules_.find(module->code_file()) !=
no_symbol_modules_.end()) {
return kError;
}
// If module is already loaded, go ahead to fill source line info and return.
if (resolver_->HasModule(frame->module)) {
resolver_->FillSourceLineInfo(frame);
return resolver_->IsModuleCorrupt(frame->module) ?
kWarningCorruptSymbols : kNoError;
}
// Module needs to fetch symbol file. First check to see if supplier exists.
if (!supplier_) {
return kError;
}
// Start fetching symbol from supplier.
string symbol_file;
char* symbol_data = NULL;
size_t symbol_data_size;
SymbolSupplier::SymbolResult symbol_result = supplier_->GetCStringSymbolData(
module, system_info, &symbol_file, &symbol_data, &symbol_data_size);
switch (symbol_result) {
case SymbolSupplier::FOUND: {
bool load_success = resolver_->LoadModuleUsingMemoryBuffer(
frame->module,
symbol_data,
symbol_data_size);
if (resolver_->ShouldDeleteMemoryBufferAfterLoadModule()) {
supplier_->FreeSymbolData(module);
}
if (load_success) {
resolver_->FillSourceLineInfo(frame);
return resolver_->IsModuleCorrupt(frame->module) ?
kWarningCorruptSymbols : kNoError;
} else {
BPLOG(ERROR) << "Failed to load symbol file in resolver.";
no_symbol_modules_.insert(module->code_file());
return kError;
}
}
case SymbolSupplier::NOT_FOUND:
no_symbol_modules_.insert(module->code_file());
return kError;
case SymbolSupplier::INTERRUPT:
return kInterrupt;
default:
BPLOG(ERROR) << "Unknown SymbolResult enum: " << symbol_result;
return kError;
}
}
WindowsFrameInfo* StackFrameSymbolizer::FindWindowsFrameInfo(
const StackFrame* frame) {
return resolver_ ? resolver_->FindWindowsFrameInfo(frame) : NULL;
}
CFIFrameInfo* StackFrameSymbolizer::FindCFIFrameInfo(
const StackFrame* frame) {
return resolver_ ? resolver_->FindCFIFrameInfo(frame) : NULL;
}
} // namespace google_breakpad