mirror of
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216 lines
9.1 KiB
C++
216 lines
9.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* APIs for getting a stack trace of the current thread */
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#ifndef mozilla_StackWalk_h
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#define mozilla_StackWalk_h
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#include "mozilla/Types.h"
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#include <stdint.h>
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#include <stdio.h>
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MOZ_BEGIN_EXTERN_C
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/**
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* Returns the position of the Program Counter for the caller of the current
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* function. This is meant to be used to feed the aFirstFramePC argument to
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* MozStackWalk or MozWalkTheStack*, and should be used in the last function
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* that should be skipped in the trace, and passed down to MozStackWalk or
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* MozWalkTheStack*, through any intermediaries.
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*
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* THIS DOES NOT 100% RELIABLY GIVE THE CALLER PC, but marking functions
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* calling this macro with MOZ_NEVER_INLINE gets us close. In cases it doesn't
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* give the caller's PC, it may give the caller of the caller, or its caller,
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* etc. depending on tail call optimization.
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*
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* Past versions of stackwalking relied on passing a constant number of frames
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* to skip to MozStackWalk or MozWalkTheStack, which fell short in more cases
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* (inlining of intermediaries, tail call optimization).
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*/
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#define CallerPC() __builtin_extract_return_addr(__builtin_return_address(0))
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/**
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* The callback for MozStackWalk and MozStackWalkThread.
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*
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* @param aFrameNumber The frame number (starts at 1, not 0).
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* @param aPC The program counter value.
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* @param aSP The best approximation possible of what the stack
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* pointer will be pointing to when the execution returns
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* to executing that at aPC. If no approximation can
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* be made it will be nullptr.
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* @param aClosure Extra data passed in from MozStackWalk() or
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* MozStackWalkThread().
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*/
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typedef void (*MozWalkStackCallback)(uint32_t aFrameNumber, void* aPC,
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void* aSP, void* aClosure);
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/**
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* Call aCallback for each stack frame on the current thread, from
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* the caller of MozStackWalk to main (or above).
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*
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* @param aCallback Callback function, called once per frame.
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* @param aFirstFramePC Position of the Program Counter where the trace
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* starts from. All frames seen before reaching that
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* address are skipped. Nullptr means that the first
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* callback will be for the caller of MozStackWalk.
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* @param aMaxFrames Maximum number of frames to trace. 0 means no limit.
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* @param aClosure Caller-supplied data passed through to aCallback.
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*
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* May skip some stack frames due to compiler optimizations or code
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* generation.
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*/
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MFBT_API void MozStackWalk(MozWalkStackCallback aCallback,
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const void* aFirstFramePC, uint32_t aMaxFrames,
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void* aClosure);
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typedef struct {
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/*
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* The name of the shared library or executable containing an
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* address and the address's offset within that library, or empty
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* string and zero if unknown.
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*/
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char library[256];
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ptrdiff_t loffset;
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/*
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* The name of the file name and line number of the code
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* corresponding to the address, or empty string and zero if
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* unknown.
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*/
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char filename[256];
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unsigned long lineno;
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/*
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* The name of the function containing an address and the address's
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* offset within that function, or empty string and zero if unknown.
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*/
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char function[256];
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ptrdiff_t foffset;
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} MozCodeAddressDetails;
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/**
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* For a given pointer to code, fill in the pieces of information used
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* when printing a stack trace.
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*
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* @param aPC The code address.
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* @param aDetails A structure to be filled in with the result.
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*/
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MFBT_API bool MozDescribeCodeAddress(void* aPC,
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MozCodeAddressDetails* aDetails);
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/**
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* Format the information about a code address in a format suitable for
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* stack traces on the current platform. When available, this string
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* should contain the function name, source file, and line number. When
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* these are not available, library and offset should be reported, if
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* possible.
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*
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* Note that this output is parsed by several scripts including the fix*.py and
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* make-tree.pl scripts in tools/rb/. It should only be change with care, and
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* in conjunction with those scripts.
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*
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* @param aBuffer A string to be filled in with the description.
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* The string will always be null-terminated.
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* @param aBufferSize The size, in bytes, of aBuffer, including
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* room for the terminating null. If the information
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* to be printed would be larger than aBuffer, it
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* will be truncated so that aBuffer[aBufferSize-1]
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* is the terminating null.
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* @param aFrameNumber The frame number.
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* @param aPC The code address.
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* @param aFunction The function name. Possibly null or the empty string.
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* @param aLibrary The library name. Possibly null or the empty string.
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* @param aLOffset The library offset.
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* @param aFileName The filename. Possibly null or the empty string.
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* @param aLineNo The line number. Possibly zero.
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* @return The minimum number of characters necessary to format
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* the frame information, without the terminating null.
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* The buffer will have been truncated if the returned
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* value is greater than aBufferSize-1.
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*/
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MFBT_API int MozFormatCodeAddress(char* aBuffer, uint32_t aBufferSize,
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uint32_t aFrameNumber, const void* aPC,
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const char* aFunction, const char* aLibrary,
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ptrdiff_t aLOffset, const char* aFileName,
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uint32_t aLineNo);
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/**
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* Format the information about a code address in the same fashion as
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* MozFormatCodeAddress.
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*
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* @param aBuffer A string to be filled in with the description.
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* The string will always be null-terminated.
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* @param aBufferSize The size, in bytes, of aBuffer, including
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* room for the terminating null. If the information
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* to be printed would be larger than aBuffer, it
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* will be truncated so that aBuffer[aBufferSize-1]
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* is the terminating null.
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* @param aFrameNumber The frame number.
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* @param aPC The code address.
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* @param aDetails The value filled in by MozDescribeCodeAddress(aPC).
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* @return The minimum number of characters necessary to format
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* the frame information, without the terminating null.
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* The buffer will have been truncated if the returned
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* value is greater than aBufferSize-1.
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*/
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MFBT_API int MozFormatCodeAddressDetails(char* aBuffer, uint32_t aBufferSize,
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uint32_t aFrameNumber, void* aPC,
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const MozCodeAddressDetails* aDetails);
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#ifdef __cplusplus
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# define FRAMES_DEFAULT = 0
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#else
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# define FRAMES_DEFAULT
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#endif
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/**
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* Walk the stack and print the stack trace to the given stream.
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*
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* @param aStream A stdio stream.
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* @param aFirstFramePC Position of the Program Counter where the trace
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* starts from. All frames seen before reaching that
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* address are skipped. Nullptr means that the first
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* callback will be for the caller of MozWalkTheStack.
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* @param aMaxFrames Maximum number of frames to trace. 0 means no limit.
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*/
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MFBT_API void MozWalkTheStack(FILE* aStream,
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const void* aFirstFramePC FRAMES_DEFAULT,
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uint32_t aMaxFrames FRAMES_DEFAULT);
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/**
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* Walk the stack and send each stack trace line to a callback writer.
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* Each line string is null terminated but doesn't contain a '\n' character.
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*
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* @param aWriter The callback.
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* @param aFirstFramePC Position of the Program Counter where the trace
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* starts from. All frames seen before reaching that
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* address are skipped. Nullptr means that the first
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* callback will be for the caller of
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* MozWalkTheStackWithWriter.
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* @param aMaxFrames Maximum number of frames to trace. 0 means no limit.
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*/
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MFBT_API void MozWalkTheStackWithWriter(
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void (*aWriter)(const char*), const void* aFirstFramePC FRAMES_DEFAULT,
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uint32_t aMaxFrames FRAMES_DEFAULT);
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#undef FRAMES_DEFAULT
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MOZ_END_EXTERN_C
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#ifdef __cplusplus
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namespace mozilla {
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MFBT_API void FramePointerStackWalk(MozWalkStackCallback aCallback,
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uint32_t aMaxFrames, void* aClosure,
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void** aBp, void* aStackEnd);
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# if defined(XP_LINUX) || defined(XP_FREEBSD)
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MFBT_API void DemangleSymbol(const char* aSymbol, char* aBuffer, int aBufLen);
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# endif
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} // namespace mozilla
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#endif
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#endif
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