| 1 | /** @file
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| 2 | * IPRT - Tracing.
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| 3 | */
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| 4 |
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| 5 | /*
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| 6 | * Copyright (C) 2011-2022 Oracle and/or its affiliates.
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| 7 | *
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| 8 | * This file is part of VirtualBox base platform packages, as
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| 9 | * available from https://www.virtualbox.org.
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| 10 | *
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| 11 | * This program is free software; you can redistribute it and/or
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| 12 | * modify it under the terms of the GNU General Public License
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| 13 | * as published by the Free Software Foundation, in version 3 of the
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| 14 | * License.
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| 15 | *
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| 16 | * This program is distributed in the hope that it will be useful, but
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| 17 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 19 | * General Public License for more details.
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| 20 | *
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| 21 | * You should have received a copy of the GNU General Public License
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| 22 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 23 | *
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| 24 | * The contents of this file may alternatively be used under the terms
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| 25 | * of the Common Development and Distribution License Version 1.0
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| 26 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 27 | * in the VirtualBox distribution, in which case the provisions of the
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| 28 | * CDDL are applicable instead of those of the GPL.
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| 29 | *
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| 30 | * You may elect to license modified versions of this file under the
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| 31 | * terms and conditions of either the GPL or the CDDL or both.
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| 32 | *
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| 33 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 34 | */
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| 35 |
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| 36 | #ifndef IPRT_INCLUDED_trace_h
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| 37 | #define IPRT_INCLUDED_trace_h
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| 38 | #ifndef RT_WITHOUT_PRAGMA_ONCE
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| 39 | # pragma once
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| 40 | #endif
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| 41 |
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| 42 | #include <iprt/cdefs.h>
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| 43 | #include <iprt/types.h>
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| 44 | #include <iprt/stdarg.h>
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| 45 |
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| 46 | RT_C_DECLS_BEGIN
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| 47 |
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| 48 | /** @defgroup grp_rt_trace RTTrace - Tracing
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| 49 | * @ingroup grp_rt
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| 50 | *
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| 51 | * The tracing facility is somewhat similar to a stripped down logger that
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| 52 | * outputs to a circular buffer. Part of the idea here is that it can the
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| 53 | * overhead is much smaller and that it can be done without involving any
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| 54 | * locking or other thing that could throw off timing.
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| 55 | *
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| 56 | * @{
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| 57 | */
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| 58 |
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| 59 |
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| 60 | #ifdef DOXYGEN_RUNNING
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| 61 | # define RTTRACE_DISABLED
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| 62 | # define RTTRACE_ENABLED
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| 63 | #endif
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| 64 |
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| 65 | /** @def RTTRACE_DISABLED
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| 66 | * Use this compile time define to disable all tracing macros. This trumps
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| 67 | * RTTRACE_ENABLED.
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| 68 | */
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| 69 |
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| 70 | /** @def RTTRACE_ENABLED
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| 71 | * Use this compile time define to enable tracing when not in debug mode
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| 72 | */
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| 73 |
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| 74 | /*
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| 75 | * Determine whether tracing is enabled and forcefully normalize the indicators.
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| 76 | */
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| 77 | #if (defined(DEBUG) || defined(RTTRACE_ENABLED)) && !defined(RTTRACE_DISABLED)
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| 78 | # undef RTTRACE_DISABLED
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| 79 | # undef RTTRACE_ENABLED
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| 80 | # define RTTRACE_ENABLED
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| 81 | #else
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| 82 | # undef RTTRACE_DISABLED
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| 83 | # undef RTTRACE_ENABLED
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| 84 | # define RTTRACE_DISABLED
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| 85 | #endif
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| 86 |
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| 87 |
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| 88 | /** @name RTTRACEBUF_FLAGS_XXX - RTTraceBufCarve and RTTraceBufCreate flags.
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| 89 | * @{ */
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| 90 | /** Free the memory block on release using RTMemFree(). */
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| 91 | #define RTTRACEBUF_FLAGS_FREE_ME RT_BIT_32(0)
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| 92 | /** Whether the trace buffer is disabled or enabled. */
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| 93 | #define RTTRACEBUF_FLAGS_DISABLED RT_BIT_32(RTTRACEBUF_FLAGS_DISABLED_BIT)
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| 94 | /** The bit number corresponding to the RTTRACEBUF_FLAGS_DISABLED mask. */
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| 95 | #define RTTRACEBUF_FLAGS_DISABLED_BIT 1
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| 96 | /** Mask of the valid flags. */
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| 97 | #define RTTRACEBUF_FLAGS_MASK UINT32_C(0x00000003)
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| 98 | /** @} */
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| 99 |
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| 100 |
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| 101 | RTDECL(int) RTTraceBufCreate(PRTTRACEBUF hTraceBuf, uint32_t cEntries, uint32_t cbEntry, uint32_t fFlags);
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| 102 | RTDECL(int) RTTraceBufCarve(PRTTRACEBUF hTraceBuf, uint32_t cEntries, uint32_t cbEntry, uint32_t fFlags,
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| 103 | void *pvBlock, size_t *pcbBlock);
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| 104 | RTDECL(uint32_t) RTTraceBufRetain(RTTRACEBUF hTraceBuf);
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| 105 | RTDECL(uint32_t) RTTraceBufRelease(RTTRACEBUF hTraceBuf);
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| 106 | RTDECL(int) RTTraceBufDumpToLog(RTTRACEBUF hTraceBuf);
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| 107 | RTDECL(int) RTTraceBufDumpToAssert(RTTRACEBUF hTraceBuf);
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| 108 |
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| 109 | /**
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| 110 | * Trace buffer callback for processing one entry.
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| 111 | *
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| 112 | * Used by RTTraceBufEnumEntries.
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| 113 | *
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| 114 | * @returns IPRT status code. Any status code but VINF_SUCCESS will abort the
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| 115 | * enumeration and be returned by RTTraceBufEnumEntries.
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| 116 | * @param hTraceBuf The trace buffer handle.
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| 117 | * @param iEntry The entry number.
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| 118 | * @param NanoTS The timestamp of the entry.
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| 119 | * @param idCpu The ID of the CPU which added the entry.
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| 120 | * @param pszMsg The message text.
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| 121 | * @param pvUser The user argument.
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| 122 | */
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| 123 | typedef DECLCALLBACKTYPE(int, FNRTTRACEBUFCALLBACK,(RTTRACEBUF hTraceBuf, uint32_t iEntry, uint64_t NanoTS,
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| 124 | RTCPUID idCpu, const char *pszMsg, void *pvUser));
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| 125 | /** Pointer to trace buffer enumeration callback function. */
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| 126 | typedef FNRTTRACEBUFCALLBACK *PFNRTTRACEBUFCALLBACK;
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| 127 |
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| 128 | /**
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| 129 | * Enumerates the used trace buffer entries, calling @a pfnCallback for each.
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| 130 | *
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| 131 | * @returns IPRT status code. Should the callback (@a pfnCallback) return
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| 132 | * anything other than VINF_SUCCESS, then the enumeration will be
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| 133 | * aborted and the status code will be returned by this function.
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| 134 | * @retval VINF_SUCCESS
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| 135 | * @retval VERR_INVALID_HANDLE
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| 136 | * @retval VERR_INVALID_PARAMETER
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| 137 | * @retval VERR_INVALID_POINTER
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| 138 | *
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| 139 | * @param hTraceBuf The trace buffer handle. Special handles are
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| 140 | * accepted.
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| 141 | * @param pfnCallback The callback to call for each entry.
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| 142 | * @param pvUser The user argument for the callback.
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| 143 | */
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| 144 | RTDECL(int) RTTraceBufEnumEntries(RTTRACEBUF hTraceBuf, PFNRTTRACEBUFCALLBACK pfnCallback, void *pvUser);
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| 145 |
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| 146 | /**
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| 147 | * Gets the entry size used by the specified trace buffer.
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| 148 | *
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| 149 | * @returns The size on success, 0 if the handle is invalid.
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| 150 | *
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| 151 | * @param hTraceBuf The trace buffer handle. Special handles are
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| 152 | * accepted.
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| 153 | */
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| 154 | RTDECL(uint32_t) RTTraceBufGetEntrySize(RTTRACEBUF hTraceBuf);
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| 155 |
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| 156 | /**
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| 157 | * Gets the number of entries in the specified trace buffer.
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| 158 | *
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| 159 | * @returns The entry count on success, 0 if the handle is invalid.
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| 160 | *
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| 161 | * @param hTraceBuf The trace buffer handle. Special handles are
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| 162 | * accepted.
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| 163 | */
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| 164 | RTDECL(uint32_t) RTTraceBufGetEntryCount(RTTRACEBUF hTraceBuf);
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| 165 |
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| 166 |
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| 167 | /**
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| 168 | * Disables tracing.
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| 169 | *
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| 170 | * @returns @c true if tracing was enabled prior to this call, @c false if
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| 171 | * disabled already.
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| 172 | *
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| 173 | * @param hTraceBuf The trace buffer handle. Special handles are
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| 174 | * accepted.
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| 175 | */
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| 176 | RTDECL(bool) RTTraceBufDisable(RTTRACEBUF hTraceBuf);
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| 177 |
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| 178 | /**
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| 179 | * Enables tracing.
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| 180 | *
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| 181 | * @returns @c true if tracing was enabled prior to this call, @c false if
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| 182 | * disabled already.
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| 183 | *
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| 184 | * @param hTraceBuf The trace buffer handle. Special handles are
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| 185 | * accepted.
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| 186 | */
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| 187 | RTDECL(bool) RTTraceBufEnable(RTTRACEBUF hTraceBuf);
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| 188 |
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| 189 |
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| 190 | RTDECL(int) RTTraceBufAddMsg( RTTRACEBUF hTraceBuf, const char *pszMsg);
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| 191 | RTDECL(int) RTTraceBufAddMsgF( RTTRACEBUF hTraceBuf, const char *pszMsgFmt, ...) RT_IPRT_FORMAT_ATTR(2, 3);
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| 192 | RTDECL(int) RTTraceBufAddMsgV( RTTRACEBUF hTraceBuf, const char *pszMsgFmt, va_list va) RT_IPRT_FORMAT_ATTR(2, 0);
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| 193 | RTDECL(int) RTTraceBufAddMsgEx( RTTRACEBUF hTraceBuf, const char *pszMsg, size_t cbMaxMsg);
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| 194 |
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| 195 | RTDECL(int) RTTraceBufAddPos( RTTRACEBUF hTraceBuf, RT_SRC_POS_DECL);
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| 196 | RTDECL(int) RTTraceBufAddPosMsg( RTTRACEBUF hTraceBuf, RT_SRC_POS_DECL, const char *pszMsg);
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| 197 | RTDECL(int) RTTraceBufAddPosMsgEx( RTTRACEBUF hTraceBuf, RT_SRC_POS_DECL, const char *pszMsg, size_t cbMaxMsg);
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| 198 | RTDECL(int) RTTraceBufAddPosMsgF( RTTRACEBUF hTraceBuf, RT_SRC_POS_DECL, const char *pszMsgFmt, ...) RT_IPRT_FORMAT_ATTR(5, 6);
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| 199 | RTDECL(int) RTTraceBufAddPosMsgV( RTTRACEBUF hTraceBuf, RT_SRC_POS_DECL, const char *pszMsgFmt, va_list va) RT_IPRT_FORMAT_ATTR(5, 0);
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| 200 |
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| 201 |
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| 202 | RTDECL(int) RTTraceSetDefaultBuf(RTTRACEBUF hTraceBuf);
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| 203 | RTDECL(RTTRACEBUF) RTTraceGetDefaultBuf(void);
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| 204 |
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| 205 |
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| 206 | /** @def RTTRACE_BUF
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| 207 | * The trace buffer used by the macros.
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| 208 | */
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| 209 | #ifndef RTTRACE_BUF
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| 210 | # define RTTRACE_BUF NULL
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| 211 | #endif
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| 212 |
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| 213 | /**
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| 214 | * Record the current source position.
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| 215 | */
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| 216 | #ifdef RTTRACE_ENABLED
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| 217 | # define RTTRACE_POS() do { RTTraceBufAddPos(RTTRACE_BUF, RT_SRC_POS); } while (0)
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| 218 | #else
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| 219 | # define RTTRACE_POS() do { } while (0)
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| 220 | #endif
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| 221 |
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| 222 |
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| 223 | /** @} */
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| 224 |
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| 225 | RT_C_DECLS_END
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| 226 |
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| 227 | #endif /* !IPRT_INCLUDED_trace_h */
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| 228 |
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