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// Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <sstream>
#include <string>

#include "base/debug_util.h"
#include "base/logging.h"
#include "testing/gtest/include/gtest/gtest.h"

TEST(StackTrace, OutputToStream) {
  StackTrace trace;

  // Dump the trace into a string.
  std::ostringstream os;
  trace.OutputToStream(&os);
  std::string backtrace_message = os.str();

  size_t frames_found = 0;
  trace.Addresses(&frames_found);
  if (frames_found == 0) {
    LOG(ERROR) << "No stack frames found.  Skipping rest of test.";
    return;
  }

  // Check if the output has symbol initialization warning.  If it does, fail.
  if (backtrace_message.find("Dumping unresolved backtrace") != 
      std::string::npos) {
    LOG(ERROR) << "Unable to resolve symbols.  Skipping rest of test.";
    return;
  }

#if 0
//TODO(ajwong): Disabling checking of symbol resolution since it depends
//  on whether or not symbols are present, and there are too many
//  configurations to reliably ensure that symbols are findable.
#if defined(OS_MACOSX)

  // Symbol resolution via the backtrace_symbol funciton does not work well
  // in OsX.
  // See this thread: 
  //
  //    http://lists.apple.com/archives/darwin-dev/2009/Mar/msg00111.html
  //
  // Just check instead that we find our way back to the "start" symbol
  // which should be the first symbol in the trace.
  //
  // TODO(port): Find a more reliable way to resolve symbols.

  // Expect to at least find main.
  EXPECT_TRUE(backtrace_message.find("start") != std::string::npos)
      << "Expected to find start in backtrace:\n"
      << backtrace_message;

#else  // defined(OS_MACOSX)

  // Expect to at least find main.
  EXPECT_TRUE(backtrace_message.find("main") != std::string::npos)
      << "Expected to find main in backtrace:\n"
      << backtrace_message;

#if defined(OS_WIN)
// MSVC doesn't allow the use of C99's __func__ within C++, so we fake it with
// MSVC's __FUNCTION__ macro.
#define __func__ __FUNCTION__
#endif

  // Expect to find this function as well.
  // Note: This will fail if not linked with -rdynamic (aka -export_dynamic)
  EXPECT_TRUE(backtrace_message.find(__func__) != std::string::npos)
      << "Expected to find " << __func__ << " in backtrace:\n"
      << backtrace_message;

#endif  // define(OS_MACOSX)
#endif
}