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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 <memory>
#include "processor/stackwalker.h"
#include "google/symbol_supplier.h"
#include "processor/minidump.h"
#include "processor/source_line_resolver.h"
#include "processor/stackwalker_ppc.h"
#include "processor/stackwalker_x86.h"
namespace google_airbag {
using std::auto_ptr;
Stackwalker::Stackwalker(MemoryRegion *memory, MinidumpModuleList *modules,
SymbolSupplier *supplier)
: memory_(memory), modules_(modules), supplier_(supplier) {
}
void Stackwalker::Walk(StackFrames *frames) {
frames->clear();
SourceLineResolver resolver;
// 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();
if (modules_ && supplier_) {
string symbol_file =
supplier_->GetSymbolFile(module);
if (!symbol_file.empty()) {
resolver.LoadModule(*(module->GetName()), symbol_file);
resolver.FillSourceLineInfo(frame.get());
}
}
}
}
// 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(), frames);
}
}
// static
Stackwalker* Stackwalker::StackwalkerForCPU(MinidumpContext *context,
MemoryRegion *memory,
MinidumpModuleList *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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