DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Implementation

Mercurial (5216dd412535)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131
/* vim: set shiftwidth=4 tabstop=8 autoindent cindent expandtab: */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is NS_WalkTheStack.
 *
 * The Initial Developer of the Original Code is the Mozilla Foundation.
 * Portions created by the Initial Developer are Copyright (C) 2007
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   L. David Baron <dbaron@dbaron.org>, Mozilla Corporation (original author)
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

/* 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"

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.
 *
 * 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);

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_) */