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