profiler/CallIdentifier.h

   1 /*
   2  * Copyright (C) 2008 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         String m_name;
  40         String m_url;
  41         unsigned m_lineNumber;
  42
  43         CallIdentifier()
  44             : m_lineNumber(0)
  45         {
  46         }
  47
  48         CallIdentifier(const String& name, const String& url, int lineNumber)
  49             : m_name(name)
  50             , m_url(!url.isNull() ? url : "")
  51             , m_lineNumber(lineNumber)
  52         {
  53         }
  54
  55         inline bool operator==(const CallIdentifier& ci) const { return ci.m_lineNumber == m_lineNumber && ci.m_name == m_name && ci.m_url == m_url; }
  56         inline bool operator!=(const CallIdentifier& ci) const { return !(*this == ci); }
  57
  58         struct Hash {
  59             static unsigned hash(const CallIdentifier& key)
  60             {
  61                 unsigned hashCodes[3] = {
  62                     key.m_name.impl()->hash(),
  63                     key.m_url.impl()->hash(),
  64                     key.m_lineNumber
  65                 };
  66                 return StringHasher::hashMemory<sizeof(hashCodes)>(hashCodes);
  67             }
  68
  69             static bool equal(const CallIdentifier& a, const CallIdentifier& b) { return a == b; }
  70             static const bool safeToCompareToEmptyOrDeleted = true;
  71         };
  72
  73         unsigned hash() const { return Hash::hash(*this); }
  74
  75 #ifndef NDEBUG
  76         operator const char*() const { return c_str(); }
  77         const char* c_str() const { return m_name.utf8().data(); }
  78 #endif
  79     };
  80
  81 } // namespace JSC
  82
  83 namespace WTF {
  84
  85     template<> struct DefaultHash<JSC::CallIdentifier> { typedef JSC::CallIdentifier::Hash Hash; };
  86
  87     template<> struct HashTraits<JSC::CallIdentifier> : GenericHashTraits<JSC::CallIdentifier> {
  88         static void constructDeletedValue(JSC::CallIdentifier& slot)
  89         {
  90             new (NotNull, &slot) JSC::CallIdentifier(String(), String(), std::numeric_limits<unsigned>::max());
  91         }
  92         static bool isDeletedValue(const JSC::CallIdentifier& value)
  93         {
  94             return value.m_name.isNull() && value.m_url.isNull() && value.m_lineNumber == std::numeric_limits<unsigned>::max();
  95         }
  96     };
  97
  98 } // namespace WTF
  99
 100 #endif  // CallIdentifier_h
 101