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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /mozglue/misc/StackWalk.h
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
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+/* -*- 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