profiler/CallIdentifier.h

   1 /*
   2  * Copyright (C) 2008, 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
  27 #ifndef CallIdentifier_h
  28 #define CallIdentifier_h
  29
  30 #include <wtf/text/CString.h>
  31 #include <wtf/text/StringHash.h>
  32 #include <wtf/text/WTFString.h>
  33
  34 namespace JSC {
  35
  36     struct CallIdentifier {
  37         WTF_MAKE_FAST_ALLOCATED;
  38     public:
  39         CallIdentifier()
  40             : m_lineNumber(0)
  41             , m_columnNumber(0)
  42         {
  43         }
  44
  45         CallIdentifier(const String& functionName, const String& url, unsigned lineNumber, unsigned columnNumber)
  46             : m_functionName(functionName)
  47             , m_url(!url.isNull() ? url : "")
  48             , m_lineNumber(lineNumber)
  49             , m_columnNumber(columnNumber)
  50         {
  51         }
  52
  53         const String& functionName() const { return m_functionName; }
  54
  55         const String& url() const { return m_url; }
  56         unsigned lineNumber() const { return m_lineNumber; }
  57         unsigned columnNumber() const { return m_columnNumber; }
  58
  59         inline bool operator==(const CallIdentifier& other) const { return other.m_lineNumber == m_lineNumber && other.m_columnNumber == m_columnNumber && other.m_functionName == m_functionName && other.m_url == m_url; }
  60         inline bool operator!=(const CallIdentifier& other) const { return !(*this == other); }
  61
  62         struct Hash {
  63             static unsigned hash(const CallIdentifier& key)
  64             {
  65                 unsigned hashCodes[4] = {
  66                     key.m_functionName.impl()->hash(),
  67                     key.m_url.impl()->hash(),
  68                     key.m_lineNumber,
  69                     key.m_columnNumber
  70                 };
  71                 return StringHasher::hashMemory<sizeof(hashCodes)>(hashCodes);
  72             }
  73
  74             static bool equal(const CallIdentifier& a, const CallIdentifier& b) { return a == b; }
  75             static const bool safeToCompareToEmptyOrDeleted = true;
  76         };
  77
  78         unsigned hash() const { return Hash::hash(*this); }
  79
  80 #ifndef NDEBUG
  81         operator const char*() const { return c_str(); }
  82         const char* c_str() const { return m_functionName.utf8().data(); }
  83 #endif
  84
  85     private:
  86         String m_functionName;
  87         String m_url;
  88         unsigned m_lineNumber;
  89         unsigned m_columnNumber;
  90     };
  91
  92 } // namespace JSC
  93
  94 namespace WTF {
  95
  96     template<> struct DefaultHash<JSC::CallIdentifier> { typedef JSC::CallIdentifier::Hash Hash; };
  97
  98     template<> struct HashTraits<JSC::CallIdentifier> : GenericHashTraits<JSC::CallIdentifier> {
  99         static void constructDeletedValue(JSC::CallIdentifier& slot)
 100         {
 101             new (NotNull, &slot) JSC::CallIdentifier(String(), String(), std::numeric_limits<unsigned>::max(), std::numeric_limits<unsigned>::max());
 102         }
 103
 104         static bool isDeletedValue(const JSC::CallIdentifier& value)
 105         {
 106             return value.functionName().isNull() && value.url().isNull() && value.lineNumber() == std::numeric_limits<unsigned>::max() && value.columnNumber() == std::numeric_limits<unsigned>::max();
 107         }
 108     };
 109
 110 } // namespace WTF
 111
 112 #endif  // CallIdentifier_h