breakpad/src/processor/stackwalker.cc

// Copyright (c) 2006, Google Inc.
// All rights reserved.
//
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// modification, are permitted provided that the following conditions are
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//
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// stackwalker.cc: Generic stackwalker.
//
// See stackwalker.h for documentation.
//
// Author: Mark Mentovai


#include <memory>

#include "processor/stackwalker.h"
#include "processor/minidump.h"
#include "processor/source_line_resolver.h"
#include "google/symbol_supplier.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());
  }
}


} // namespace google_airbag