gecko-dev/xpcom/base/nsStackWalk.h

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C

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* API for getting a stack trace of the C/C++ stack on the current thread */
#ifndef nsStackWalk_h_
#define nsStackWalk_h_
/* WARNING: This file is intended to be included from C or C++ files. */
#include "nscore.h"
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
// aSP will be the best approximation possible of what the stack pointer will be
// pointing to when the execution returns to executing that at that PC.
// If no approximation can be made it will be nullptr.
typedef void
(*NS_WalkStackCallback)(void* aPC, void* aSP, void* aClosure);
/**
* Call aCallback for the C/C++ stack frames on the current thread, from
* the caller of NS_StackWalk to main (or above).
*
* @param aCallback Callback function, called once per frame.
* @param aSkipFrames Number of initial frames to skip. 0 means that
* the first callback will be for the caller of
* NS_StackWalk.
* @param aMaxFrames Maximum number of frames to trace. 0 means no limit.
* @param aClosure Caller-supplied data passed through to aCallback.
* @param aThread The thread for which the stack is to be retrieved.
* Passing null causes us to walk the stack of the
* current thread. On Windows, this is a thread HANDLE.
* It is currently not supported on any other platform.
* @param aPlatformData Platform specific data that can help in walking the
* stack, this should be nullptr unless you really know
* what you're doing! This needs to be a pointer to a
* CONTEXT on Windows and should not be passed on other
* platforms.
*
* Return values:
* - NS_ERROR_NOT_IMPLEMENTED. Occurs on platforms where it is unimplemented.
*
* - NS_ERROR_UNEXPECTED. Occurs when the stack indicates that the thread
* is in a very dangerous situation (e.g., holding sem_pool_lock in Mac OS X
* pthreads code). Callers should then bail out immediately.
*
* - NS_ERROR_FAILURE. Occurs when stack walking completely failed, i.e.
* aCallback was never called.
*
* - NS_OK. Occurs when stack walking succeeded, i.e. aCallback was called at
* least once (and there was no need to exit with NS_ERROR_UNEXPECTED).
*
* May skip some stack frames due to compiler optimizations or code
* generation.
*
* Note: this (and other helper methods) will only be available when
* MOZ_STACKWALKING is defined, so any new consumers must #if based on that.
*/
XPCOM_API(nsresult)
NS_StackWalk(NS_WalkStackCallback aCallback, uint32_t aSkipFrames,
uint32_t aMaxFrames, void* aClosure, uintptr_t aThread,
void* aPlatformData);
typedef struct
{
/*
* The name of the shared library or executable containing an
* address and the address's offset within that library, or empty
* string and zero if unknown.
*/
char library[256];
ptrdiff_t loffset;
/*
* The name of the file name and line number of the code
* corresponding to the address, or empty string and zero if
* unknown.
*/
char filename[256];
unsigned long lineno;
/*
* The name of the function containing an address and the address's
* offset within that function, or empty string and zero if unknown.
*/
char function[256];
ptrdiff_t foffset;
} nsCodeAddressDetails;
/**
* For a given pointer to code, fill in the pieces of information used
* when printing a stack trace.
*
* @param aPC The code address.
* @param aDetails A structure to be filled in with the result.
*/
XPCOM_API(nsresult)
NS_DescribeCodeAddress(void* aPC, nsCodeAddressDetails* aDetails);
/**
* Format the information about a code address in a format suitable for
* stack traces on the current platform. When available, this string
* should contain the function name, source file, and line number. When
* these are not available, library and offset should be reported, if
* possible.
*
* @param aPC The code address.
* @param aDetails The value filled in by NS_DescribeCodeAddress(aPC).
* @param aBuffer A string to be filled in with the description.
* The string will always be null-terminated.
* @param aBufferSize The size, in bytes, of aBuffer, including
* room for the terminating null. If the information
* to be printed would be larger than aBuffer, it
* will be truncated so that aBuffer[aBufferSize-1]
* is the terminating null.
*/
XPCOM_API(nsresult)
NS_FormatCodeAddressDetails(void* aPC, const nsCodeAddressDetails* aDetails,
char* aBuffer, uint32_t aBufferSize);
#ifdef __cplusplus
}
#endif
#endif /* !defined(nsStackWalk_h_) */