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Diffstat (limited to 'mozglue/misc/StackWalk.h')
| -rw-r--r-- | mozglue/misc/StackWalk.h | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/mozglue/misc/StackWalk.h b/mozglue/misc/StackWalk.h new file mode 100644 index 000000000..534c0bd82 --- /dev/null +++ b/mozglue/misc/StackWalk.h @@ -0,0 +1,163 @@ +/* -*- 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 mozilla_StackWalk_h +#define mozilla_StackWalk_h + +/* WARNING: This file is intended to be included from C or C++ files. */ + +#include "mozilla/Types.h" +#include <stdint.h> + +/** + * The callback for MozStackWalk. + * + * @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 via MozStackWalk(). + */ +typedef void +(*MozWalkStackCallback)(uint32_t aFrameNumber, void* aPC, void* aSP, + void* aClosure); + +/** + * Call aCallback for the C/C++ stack frames on the current thread, from + * the caller of MozStackWalk 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 + * MozStackWalk. + * @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. + * + * May skip some stack frames due to compiler optimizations or code + * generation. + * + */ +MFBT_API bool +MozStackWalk(MozWalkStackCallback 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; +} 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. + */ +MFBT_API void +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). + */ +MFBT_API void +MozFormatCodeAddressDetails(char* aBuffer, uint32_t aBufferSize, + uint32_t aFrameNumber, void* aPC, + const MozCodeAddressDetails* aDetails); + +namespace mozilla { + +MFBT_API bool +FramePointerStackWalk(MozWalkStackCallback aCallback, uint32_t aSkipFrames, + uint32_t aMaxFrames, void* aClosure, void** aBp, + void* aStackEnd); + +} // namespace mozilla + +/** + * Initialize the critical sections for this platform so that we can + * abort stack walks when needed. + */ +MFBT_API void +StackWalkInitCriticalAddress(void); + +#endif |