Quelle StackWalk.h Sprache: 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/. */

/* APIs for getting a stack trace of the current thread */

#ifndef mozilla_StackWalk_h
#define mozilla_StackWalk_h

#include "mozilla/Types.h"
#include <stdint.h>
#include <stdio.h>

MOZ_BEGIN_EXTERN_C

/**
* Returns the position of the Program Counter for the caller of the current
* function. This is meant to be used to feed the aFirstFramePC argument to
* MozStackWalk or MozWalkTheStack*, and should be used in the last function
* that should be skipped in the trace, and passed down to MozStackWalk or
* MozWalkTheStack*, through any intermediaries.
*
* THIS DOES NOT 100% RELIABLY GIVE THE CALLER PC, but marking functions
* calling this macro with MOZ_NEVER_INLINE gets us close. In cases it doesn't
* give the caller's PC, it may give the caller of the caller, or its caller,
* etc. depending on tail call optimization.
*
* Past versions of stackwalking relied on passing a constant number of frames
* to skip to MozStackWalk or MozWalkTheStack, which fell short in more cases
* (inlining of intermediaries, tail call optimization).
*/
#define CallerPC() __builtin_extract_return_addr(__builtin_return_address(0))

/**
* The callback for MozStackWalk and MozStackWalkThread.
*
* @param aFrameNumber  The frame number (starts at 1, not 0).
* @param aPC           The program counter value.
* @param aSP           The best approximation possible of what the stack
*                      pointer will be pointing to when the execution returns
*                      to executing that at aPC. If no approximation can
*                      be made it will be nullptr.
* @param aClosure      Extra data passed in from MozStackWalk() or
*                      MozStackWalkThread().
*/
typedef void (*MozWalkStackCallback)(uint32_t aFrameNumber, void* aPC,
                                     void* aSP, void* aClosure);

/**
* Call aCallback for each stack frame on the current thread, from
* the caller of MozStackWalk to main (or above).
*
* @param aCallback     Callback function, called once per frame.
* @param aFirstFramePC Position of the Program Counter where the trace
*                      starts from. All frames seen before reaching that
*                      address are skipped. Nullptr means that the first
*                      callback will be for the caller of MozStackWalk.
* @param aMaxFrames    Maximum number of frames to trace.  0 means no limit.
* @param aClosure      Caller-supplied data passed through to aCallback.
*
* May skip some stack frames due to compiler optimizations or code
* generation.
*/
MFBT_API void MozStackWalk(MozWalkStackCallback aCallback,
                           const void* aFirstFramePC, uint32_t aMaxFrames,
                           void* aClosure);

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;
} MozCodeAddressDetails;

/**
* 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.
*/
MFBT_API bool MozDescribeCodeAddress(void* aPC,
                                     MozCodeAddressDetails* 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.
*
* Note that this output is parsed by several scripts including the fix*.py and
* make-tree.pl scripts in tools/rb/. It should only be change with care, and
* in conjunction with those scripts.
*
* @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.
* @param aFrameNumber The frame number.
* @param aPC          The code address.
* @param aFunction    The function name. Possibly null or the empty string.
* @param aLibrary     The library name. Possibly null or the empty string.
* @param aLOffset     The library offset.
* @param aFileName    The filename. Possibly null or the empty string.
* @param aLineNo      The line number. Possibly zero.
* @return             The minimum number of characters necessary to format
*                     the frame information, without the terminating null.
*                     The buffer will have been truncated if the returned
*                     value is greater than aBufferSize-1.
*/
MFBT_API int MozFormatCodeAddress(char* aBuffer, uint32_t aBufferSize,
                                  uint32_t aFrameNumber, const void* aPC,
                                  const char* aFunction, const char* aLibrary,
                                  ptrdiff_t aLOffset, const char* aFileName,
                                  uint32_t aLineNo);

/**
* Format the information about a code address in the same fashion as
* MozFormatCodeAddress.
*
* @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.
* @param aFrameNumber The frame number.
* @param aPC          The code address.
* @param aDetails     The value filled in by MozDescribeCodeAddress(aPC).
* @return             The minimum number of characters necessary to format
*                     the frame information, without the terminating null.
*                     The buffer will have been truncated if the returned
*                     value is greater than aBufferSize-1.
*/
MFBT_API int MozFormatCodeAddressDetails(char* aBuffer, uint32_t aBufferSize,
                                         uint32_t aFrameNumber, void* aPC,
                                         const MozCodeAddressDetails* aDetails);

#ifdef __cplusplus
#  define FRAMES_DEFAULT = 0
#else
#  define FRAMES_DEFAULT
#endif
/**
* Walk the stack and print the stack trace to the given stream.
*
* @param aStream       A stdio stream.
* @param aFirstFramePC Position of the Program Counter where the trace
*                      starts from. All frames seen before reaching that
*                      address are skipped. Nullptr means that the first
*                      callback will be for the caller of MozWalkTheStack.
* @param aMaxFrames    Maximum number of frames to trace.  0 means no limit.
*/
MFBT_API void MozWalkTheStack(FILE* aStream,
                              const void* aFirstFramePC FRAMES_DEFAULT,
                              uint32_t aMaxFrames FRAMES_DEFAULT);

/**
* Walk the stack and send each stack trace line to a callback writer.
* Each line string is null terminated but doesn't contain a '\n' character.
*
* @param aWriter       The callback.
* @param aFirstFramePC Position of the Program Counter where the trace
*                      starts from. All frames seen before reaching that
*                      address are skipped. Nullptr means that the first
*                      callback will be for the caller of
* MozWalkTheStackWithWriter.
* @param aMaxFrames    Maximum number of frames to trace.  0 means no limit.
*/
MFBT_API void MozWalkTheStackWithWriter(
    void (*aWriter)(const char*), const void* aFirstFramePC FRAMES_DEFAULT,
    uint32_t aMaxFrames FRAMES_DEFAULT);

#undef FRAMES_DEFAULT

MOZ_END_EXTERN_C

#ifdef __cplusplus
namespace mozilla {

MFBT_API void FramePointerStackWalk(MozWalkStackCallback aCallback,
                                    uint32_t aMaxFrames, void* aClosure,
                                    void** aBp, void* aStackEnd);

#  if defined(XP_LINUX) || defined(XP_FREEBSD)
MFBT_API void DemangleSymbol(const char* aSymbol, char* aBuffer, int aBufLen);
#  endif

}  // namespace mozilla
#endif

#endif

quality100%

¤ Dauer der Verarbeitung: 0.10 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.