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// Copyright (C) 2006 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.
// stackwalker.cc: Generic stackwalker.
//
// See stackwalker.h for documentation.
//
// Author: Mark Mentovai
#include <memory>
#include "processor/stackwalker.h"
#include "processor/minidump.h"
namespace google_airbag {
using std::auto_ptr;
Stackwalker::Stackwalker(MemoryRegion* memory, MinidumpModuleList* modules)
: memory_(memory), modules_(modules) {
}
StackFrames* Stackwalker::Walk() {
auto_ptr<StackFrames> frames(new StackFrames());
// Begin with the context frame, and keep getting callers until there are
// no more.
auto_ptr<StackFrame> frame(new StackFrame());
bool valid = GetContextFrame(frame.get());
while (valid) {
// frame already contains a good frame with properly set instruction and
// frame_pointer fields. The frame structure comes from either the
// context frame (above) or a caller frame (below).
// Resolve the module information, if a module map was provided.
if (modules_) {
MinidumpModule* module =
modules_->GetModuleForAddress(frame->instruction);
if (module) {
frame->module_name = *(module->GetName());
frame->module_base = module->base_address();
}
}
// Copy the frame into the frames vector.
frames->push_back(*frame);
// Use a new object for the next frame, even though the old object was
// copied. If StackFrame provided some sort of Clear() method, then
// the same frame could be reused.
frame.reset(new StackFrame());
// Get the next frame.
valid = GetCallerFrame(frame.get());
}
return frames.release();
}
} // namespace google_airbag
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