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 #ifndef JITCode_h

    27 #define JITCode_h

    28 

    29 #if ENABLE(JIT)

    30 

    31 #include "CallFrame.h"

    32 #include "JSValue.h"

    33 #include "MacroAssemblerCodeRef.h"

    34 #include "Profiler.h"

    35 

    36 namespace JSC {

    37 

    38     class JSGlobalData;

    39     class RegisterFile;

    40 

    41     class JITCode {

    42         typedef MacroAssemblerCodeRef CodeRef;

    43         typedef MacroAssemblerCodePtr CodePtr;

    44     public:

    45         JITCode()

    46         {

    47         }

    48 

    49         JITCode(const CodeRef ref)

    50             : m_ref(ref)

    51         {

    52         }

    53 

    54         bool operator !() const

    55         {

    56             return !m_ref.m_code.executableAddress();

    57         }

    58 

    59         CodePtr addressForCall()

    60         {

    61             return m_ref.m_code;

    62         }

    63 

    64         // This function returns the offset in bytes of 'pointerIntoCode' into

    65         // this block of code.  The pointer provided must be a pointer into this

    66         // block of code.  It is ASSERTed that no codeblock >4gb in size.

    67         unsigned offsetOf(void* pointerIntoCode)

    68         {

    69             intptr_t result = reinterpret_cast<intptr_t>(pointerIntoCode) - reinterpret_cast<intptr_t>(m_ref.m_code.executableAddress());

    70             ASSERT(static_cast<intptr_t>(static_cast<unsigned>(result)) == result);

    71             return static_cast<unsigned>(result);

    72         }

    73 

    74         // Execute the code!

    75         inline JSValue execute(RegisterFile* registerFile, CallFrame* callFrame, JSGlobalData* globalData, JSValue* exception)

    76         {

    77             return JSValue::decode(ctiTrampoline(m_ref.m_code.executableAddress(), registerFile, callFrame, exception, Profiler::enabledProfilerReference(), globalData));

    78         }

    79 

    80         void* start()

    81         {

    82             return m_ref.m_code.dataLocation();

    83         }

    84 

    85         size_t size()

    86         {

    87             ASSERT(m_ref.m_code.executableAddress());

    88             return m_ref.m_size;

    89         }

    90 

    91         ExecutablePool* getExecutablePool()

    92         {

    93             return m_ref.m_executablePool.get();

    94         }

    95 

    96         // Host functions are a bit special; they have a m_code pointer but they

    97         // do not individully ref the executable pool containing the trampoline.

    98         static JITCode HostFunction(CodePtr code)

    99         {

   100             return JITCode(code.dataLocation(), 0, 0);

   101         }

   102 

   103     private:

   104         JITCode(void* code, PassRefPtr<ExecutablePool> executablePool, size_t size)

   105             : m_ref(code, executablePool, size)

   106         {

   107         }

   108 

   109         CodeRef m_ref;

   110     };

   111 

   112 };

   113 

   114 #endif

   115 

   116 #endif