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| 1 /* | |
| 2 * Copyright (C) 2012 Apple Inc. All rights reserved. | |
| 3 * | |
| 4 * Redistribution and use in source and binary forms, with or without | |
| 5 * modification, are permitted provided that the following conditions | |
| 6 * are met: | |
| 7 * 1. Redistributions of source code must retain the above copyright | |
| 8 * notice, this list of conditions and the following disclaimer. | |
| 9 * 2. Redistributions in binary form must reproduce the above copyright | |
| 10 * notice, this list of conditions and the following disclaimer in the | |
| 11 * documentation and/or other materials provided with the distribution. | |
| 12 * | |
| 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY | |
| 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR | |
| 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
| 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 24 */ | |
| 25 | |
| 26 #ifndef StackStats_h | |
| 27 #define StackStats_h | |
| 28 | |
| 29 #include "ThreadingPrimitives.h" | |
| 30 | |
| 31 | |
| 32 // Define this flag to enable Stack stats collection. This feature is useful | |
| 33 // for getting a sample of native stack usage sizes. | |
| 34 // | |
| 35 // Enabling this will cause stats to be collected and written to a log file at | |
| 36 // various instrumented points in the code. It will result in noticeable | |
| 37 // performance loss. Hence, this should only be enable when you want to do | |
| 38 // some stats location in your local build. This code is provided here as a | |
| 39 // convenience for collecting that data. It is not meant to be enabled by | |
| 40 // default on release or debug builds. | |
| 41 | |
| 42 // #define ENABLE_STACK_STATS 1 | |
| 43 | |
| 44 | |
| 45 namespace WTF { | |
| 46 | |
| 47 #if !ENABLE(STACK_STATS) | |
| 48 | |
| 49 class StackStats { | |
| 50 public: | |
| 51 // The CheckPoint class is for marking check points corresponding | |
| 52 // each location in code where a stack recursion check is being done. | |
| 53 | |
| 54 class CheckPoint { | |
| 55 public: | |
| 56 CheckPoint() { } | |
| 57 }; | |
| 58 | |
| 59 class PerThreadStats { | |
| 60 public: | |
| 61 PerThreadStats() { } | |
| 62 }; | |
| 63 | |
| 64 class LayoutCheckPoint { | |
| 65 public: | |
| 66 LayoutCheckPoint() { } | |
| 67 }; | |
| 68 | |
| 69 static void initialize() { } | |
| 70 static void probe() { } | |
| 71 }; | |
| 72 | |
| 73 #else // ENABLE(STACK_STATS) | |
| 74 | |
| 75 class StackStats { | |
| 76 public: | |
| 77 // The CheckPoint class is for marking check points corresponding | |
| 78 // each location in code where a stack recursion check is being done. | |
| 79 | |
| 80 class CheckPoint { | |
| 81 public: | |
| 82 CheckPoint(); | |
| 83 ~CheckPoint(); | |
| 84 private: | |
| 85 CheckPoint* m_prev; | |
| 86 }; | |
| 87 | |
| 88 class PerThreadStats { | |
| 89 public: | |
| 90 PerThreadStats(); | |
| 91 | |
| 92 private: | |
| 93 int m_reentryDepth; | |
| 94 char* m_stackStart; | |
| 95 CheckPoint* m_currentCheckPoint; | |
| 96 | |
| 97 friend class CheckPoint; | |
| 98 friend class StackStats; | |
| 99 }; | |
| 100 | |
| 101 class LayoutCheckPoint { | |
| 102 public: | |
| 103 LayoutCheckPoint(); | |
| 104 ~LayoutCheckPoint(); | |
| 105 | |
| 106 private: | |
| 107 LayoutCheckPoint* m_prev; | |
| 108 int m_depth; | |
| 109 }; | |
| 110 | |
| 111 // Initializes locks and the log file. Should only be called once. | |
| 112 static void initialize(); | |
| 113 | |
| 114 // Used for probing the stack at places where we suspect to be high | |
| 115 // points of stack usage but are NOT check points where stack recursion | |
| 116 // is checked. | |
| 117 // | |
| 118 // The more places where we add this probe, the more accurate our | |
| 119 // stats data will be. However, adding too many probes will also | |
| 120 // result in unnecessary performance loss. So, only add these probes | |
| 121 // judiciously where appropriate. | |
| 122 static void probe(); | |
| 123 | |
| 124 private: | |
| 125 // CheckPoint management: | |
| 126 static Mutex* s_sharedLock; | |
| 127 static CheckPoint* s_topCheckPoint; | |
| 128 static LayoutCheckPoint* s_firstLayoutCheckPoint; | |
| 129 static LayoutCheckPoint* s_topLayoutCheckPoint; | |
| 130 | |
| 131 // High watermark stats: | |
| 132 static int s_maxCheckPointDiff; | |
| 133 static int s_maxStackHeight; | |
| 134 static int s_maxReentryDepth; | |
| 135 | |
| 136 static int s_maxLayoutCheckPointDiff; | |
| 137 static int s_maxTotalLayoutCheckPointDiff; | |
| 138 static int s_maxLayoutReentryDepth; | |
| 139 | |
| 140 friend class CheckPoint; | |
| 141 friend class LayoutCheckPoint; | |
| 142 }; | |
| 143 | |
| 144 #endif // ENABLE(STACK_STATS) | |
| 145 | |
| 146 } // namespace WTF | |
| 147 | |
| 148 using WTF::StackStats; | |
| 149 | |
| 150 #endif // StackStats_h | |
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