runtime/FunctionHasExecutedCache.h

   1 /*
   2  * Copyright (C) 2014 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 FunctionHasExecutedCache_h
  27 #define FunctionHasExecutedCache_h
  28
  29 #include <unordered_map>
  30 #include <wtf/HashMethod.h>
  31 #include <wtf/Vector.h>
  32
  33 namespace JSC {
  34
  35 class FunctionHasExecutedCache {
  36 public:
  37     struct FunctionRange {
  38         FunctionRange() {}
  39         bool operator==(const FunctionRange& other) const
  40         {
  41             return m_start == other.m_start && m_end == other.m_end;
  42         }
  43         unsigned hash() const
  44         {
  45             return m_start * m_end;
  46         }
  47
  48         unsigned m_start;
  49         unsigned m_end;
  50     };
  51
  52     bool hasExecutedAtOffset(intptr_t id, unsigned offset);
  53     void insertUnexecutedRange(intptr_t id, unsigned start, unsigned end);
  54     void removeUnexecutedRange(intptr_t id, unsigned start, unsigned end);
  55     Vector<std::tuple<bool, unsigned, unsigned>> getFunctionRanges(intptr_t id);
  56
  57 private:
  58     typedef std::unordered_map<FunctionRange, bool, HashMethod<FunctionRange>> RangeMap;
  59     typedef std::unordered_map<intptr_t, RangeMap> SourceIDToRangeMap;
  60     SourceIDToRangeMap m_rangeMap;
  61 };
  62
  63 } // namespace JSC
  64
  65 #endif // FunctionHasExecutedCache_h