/* * Copyright (C) 2014 Apple Inc. All rights reserved. * Copyright (C) 2014 Saam Barati. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifndef ControlFlowProfiler_h #define ControlFlowProfiler_h #include "BasicBlockLocation.h" #include #include namespace JSC { class VM; struct BasicBlockKey { BasicBlockKey() : m_startOffset(-3) , m_endOffset(-3) { } BasicBlockKey(int startOffset, int endOffset) : m_startOffset(startOffset) , m_endOffset(endOffset) { } BasicBlockKey(WTF::HashTableDeletedValueType) : m_startOffset(-2) , m_endOffset(-2) { } bool isHashTableDeletedValue() const { return m_startOffset == -2 && m_endOffset == -2; } bool operator==(const BasicBlockKey& other) const { return m_startOffset == other.m_startOffset && m_endOffset == other.m_endOffset; } unsigned hash() const { return m_startOffset + m_endOffset + 1; } int m_startOffset; int m_endOffset; }; struct BasicBlockKeyHash { static unsigned hash(const BasicBlockKey& key) { return key.hash(); } static bool equal(const BasicBlockKey& a, const BasicBlockKey& b) { return a == b; } static const bool safeToCompareToEmptyOrDeleted = true; }; } // namespace JSC namespace WTF { template struct DefaultHash; template<> struct DefaultHash { typedef JSC::BasicBlockKeyHash Hash; }; template struct HashTraits; template<> struct HashTraits : SimpleClassHashTraits { static const bool emptyValueIsZero = false; }; } // namespace WTF namespace JSC { struct BasicBlockRange { int m_startOffset; int m_endOffset; bool m_hasExecuted; size_t m_executionCount; }; class ControlFlowProfiler { WTF_MAKE_FAST_ALLOCATED; public: ControlFlowProfiler(); ~ControlFlowProfiler(); BasicBlockLocation* getBasicBlockLocation(intptr_t sourceID, int startOffset, int endOffset); JS_EXPORT_PRIVATE void dumpData() const; Vector getBasicBlocksForSourceID(intptr_t sourceID, VM&) const; BasicBlockLocation* dummyBasicBlock() { return &m_dummyBasicBlock; } JS_EXPORT_PRIVATE bool hasBasicBlockAtTextOffsetBeenExecuted(int, intptr_t, VM&); // This function exists for testing. JS_EXPORT_PRIVATE size_t basicBlockExecutionCountAtTextOffset(int, intptr_t, VM&); // This function exists for testing. private: typedef HashMap BlockLocationCache; typedef HashMap SourceIDBuckets; SourceIDBuckets m_sourceIDBuckets; BasicBlockLocation m_dummyBasicBlock; }; } // namespace JSC #endif // ControlFlowProfiler_h