JavaScriptCore/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 <runtime/UString.h>
  31 #include "FastAllocBase.h"
  32
  33 namespace JSC {
  34
  35     struct CallIdentifier : public FastAllocBase {
  36         UString m_name;
  37         UString m_url;
  38         unsigned m_lineNumber;
  39
  40         CallIdentifier()
  41             : m_lineNumber(0)
  42         {
  43         }
  44
  45         CallIdentifier(const UString& name, const UString& url, int lineNumber)
  46             : m_name(name)
  47             , m_url(url)
  48             , m_lineNumber(lineNumber)
  49         {
  50         }
  51
  52         inline bool operator==(const CallIdentifier& ci) const { return ci.m_lineNumber == m_lineNumber && ci.m_name == m_name && ci.m_url == m_url; }
  53         inline bool operator!=(const CallIdentifier& ci) const { return !(*this == ci); }
  54
  55         struct Hash {
  56             static unsigned hash(const CallIdentifier& key)
  57             {
  58                 unsigned hashCodes[3] = {
  59                     key.m_name.rep()->hash(),
  60                     key.m_url.rep()->hash(),
  61                     key.m_lineNumber
  62                 };
  63                 return UString::Rep::computeHash(reinterpret_cast<char*>(hashCodes), sizeof(hashCodes));
  64             }
  65
  66             static bool equal(const CallIdentifier& a, const CallIdentifier& b) { return a == b; }
  67             static const bool safeToCompareToEmptyOrDeleted = true;
  68         };
  69
  70         unsigned hash() const { return Hash::hash(*this); }
  71
  72 #ifndef NDEBUG
  73         operator const char*() const { return c_str(); }
  74         const char* c_str() const { return m_name.UTF8String().c_str(); }
  75 #endif
  76     };
  77
  78 } // namespace JSC
  79
  80 namespace WTF {
  81
  82     template<> struct DefaultHash<JSC::CallIdentifier> { typedef JSC::CallIdentifier::Hash Hash; };
  83
  84     template<> struct HashTraits<JSC::CallIdentifier> : GenericHashTraits<JSC::CallIdentifier> {
  85         static void constructDeletedValue(JSC::CallIdentifier& slot)
  86         {
  87             new (&slot) JSC::CallIdentifier(JSC::UString(), JSC::UString(), std::numeric_limits<unsigned>::max());
  88         }
  89         static bool isDeletedValue(const JSC::CallIdentifier& value)
  90         {
  91             return value.m_name.isNull() && value.m_url.isNull() && value.m_lineNumber == std::numeric_limits<unsigned>::max();
  92         }
  93     };
  94
  95 } // namespace WTF
  96
  97 #endif  // CallIdentifier_h
  98