gecko/xpcom/base/nsStackWalk.h
2012-05-21 12:12:37 +01:00

105 lines
3.9 KiB
C

/* vim: set shiftwidth=4 tabstop=8 autoindent cindent expandtab: */
/* 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 <mozilla/StandardInteger.h>
PR_BEGIN_EXTERN_C
typedef void
(* NS_WalkStackCallback)(void *aPC, 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 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.
*
* Returns NS_ERROR_NOT_IMPLEMENTED on platforms where it is
* unimplemented.
* Returns NS_ERROR_UNEXPECTED 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.
*
* May skip some stack frames due to compiler optimizations or code
* generation.
*/
XPCOM_API(nsresult)
NS_StackWalk(NS_WalkStackCallback aCallback, PRUint32 aSkipFrames,
void *aClosure, uintptr_t aThread);
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];
PRUptrdiff 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];
PRUptrdiff 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, PRUint32 aBufferSize);
PR_END_EXTERN_C
#endif /* !defined(nsStackWalk_h_) */