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// Copyright (c) 2006, 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.
// stackwalker.cc: Generic stackwalker.
//
// See stackwalker.h for documentation.
//
// Author: Mark Mentovai
#include "google_airbag/processor/stackwalker.h"
#include "google_airbag/processor/call_stack.h"
#include "google_airbag/processor/code_module.h"
#include "google_airbag/processor/code_modules.h"
#include "google_airbag/processor/minidump.h"
#include "google_airbag/processor/stack_frame.h"
#include "google_airbag/processor/symbol_supplier.h"
#include "processor/linked_ptr.h"
#include "processor/scoped_ptr.h"
#include "processor/source_line_resolver.h"
#include "processor/stack_frame_info.h"
#include "processor/stackwalker_ppc.h"
#include "processor/stackwalker_x86.h"
namespace google_airbag {
Stackwalker::Stackwalker(MemoryRegion *memory, const CodeModules *modules,
SymbolSupplier *supplier)
: memory_(memory), modules_(modules), supplier_(supplier) {
}
CallStack* Stackwalker::Walk() {
SourceLineResolver resolver;
scoped_ptr<CallStack> stack(new CallStack());
// stack_frame_info parallels the CallStack. The vector is passed to the
// GetCallerFrame function. It contains information that may be helpful
// for stackwalking.
vector< linked_ptr<StackFrameInfo> > stack_frame_info;
// Begin with the context frame, and keep getting callers until there are
// no more.
// Take ownership of the pointer returned by GetContextFrame.
scoped_ptr<StackFrame> frame(GetContextFrame());
while (frame.get()) {
// 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).
linked_ptr<StackFrameInfo> frame_info;
// Resolve the module information, if a module map was provided.
if (modules_) {
const CodeModule *module =
modules_->GetModuleForAddress(frame->instruction);
if (module) {
frame->module = module;
if (!resolver.HasModule(frame->module->code_file()) && supplier_) {
string symbol_file = supplier_->GetSymbolFile(module);
if (!symbol_file.empty()) {
resolver.LoadModule(frame->module->code_file(), symbol_file);
}
}
frame_info.reset(resolver.FillSourceLineInfo(frame.get()));
}
}
// Add the frame to the call stack. Relinquish the ownership claim
// over the frame, because the stack now owns it.
stack->frames_.push_back(frame.release());
// Add the frame info to the parallel stack.
stack_frame_info.push_back(frame_info);
frame_info.reset(NULL);
// Get the next frame and take ownership.
frame.reset(GetCallerFrame(stack.get(), stack_frame_info));
}
return stack.release();
}
// static
Stackwalker* Stackwalker::StackwalkerForCPU(MinidumpContext *context,
MemoryRegion *memory,
const CodeModules *modules,
SymbolSupplier *supplier) {
Stackwalker *cpu_stackwalker = NULL;
u_int32_t cpu = context->GetContextCPU();
switch (cpu) {
case MD_CONTEXT_X86:
cpu_stackwalker = new StackwalkerX86(context->GetContextX86(),
memory, modules, supplier);
break;
case MD_CONTEXT_PPC:
cpu_stackwalker = new StackwalkerPPC(context->GetContextPPC(),
memory, modules, supplier);
break;
}
return cpu_stackwalker;
}
} // namespace google_airbag
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