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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.
// This is a cross platform interface for helper functions related to debuggers.
// You should use this to test if you're running under a debugger, and if you
// would like to yield (breakpoint) into the debugger.
#ifndef BASE_DEBUG_UTIL_H_
#define BASE_DEBUG_UTIL_H_
#include <iosfwd>
#include <vector>
#include "base/basictypes.h"
#if defined(OS_WIN)
struct _EXCEPTION_POINTERS;
#endif
// A stacktrace can be helpful in debugging. For example, you can include a
// stacktrace member in a object (probably around #ifndef NDEBUG) so that you
// can later see where the given object was created from.
class StackTrace {
public:
// Creates a stacktrace from the current location
StackTrace();
// Note that the default copy constructor and assignment constructors
// are OK.
#if defined(OS_WIN)
// Creates a stacktrace for an exception.
// Note: this function will throw an import not found (StackWalk64) exception
// on system without dbghelp 5.1.
StackTrace(_EXCEPTION_POINTERS* exception_pointers);
#endif
// Gets an array of instruction pointer values.
// count: (output) the number of elements in the returned array
const void *const *Addresses(size_t* count);
// Prints a backtrace to stderr
void PrintBacktrace();
// Resolves backtrace to symbols and write to stream.
void OutputToStream(std::ostream* os);
private:
// From http://msdn.microsoft.com/en-us/library/bb204633.aspx,
// the sum of FramesToSkip and FramesToCapture must be less than 63,
// so set it to 62. Even if on POSIX it could be a larger value, it usually
// doesn't give much more information.
static const int MAX_TRACES = 62;
void* trace_[MAX_TRACES];
int count_;
};
class DebugUtil {
public:
// Starts the registered system-wide JIT debugger to attach it to specified
// process.
static bool SpawnDebuggerOnProcess(unsigned process_id);
// Waits wait_seconds seconds for a debugger to attach to the current process.
// When silent is false, an exception is thrown when a debugger is detected.
static bool WaitForDebugger(int wait_seconds, bool silent);
// Are we running under a debugger?
// On OS X, the underlying mechanism doesn't work when the sandbox is enabled.
// To get around this, this function caches its value.
// WARNING: Because of this, on OS X, a call MUST be made to this function
// BEFORE the sandbox is enabled.
static bool BeingDebugged();
// Break into the debugger, assumes a debugger is present.
static void BreakDebugger();
#if defined(OS_MACOSX)
// On Mac OS X, it can take a really long time for the OS crash handler to
// process a Chrome crash when debugging symbols are available. This
// translates into a long wait until the process actually dies. This call
// disables Apple Crash Reporter entirely.
static void DisableOSCrashDumps();
#endif // defined(OS_MACOSX)
};
#endif // BASE_DEBUG_UTIL_H_
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