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      1 /*
      2  * Copyright (C) 2009 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 CachedCall_h
     27 #define CachedCall_h
     28 
     29 #include "CallFrameClosure.h"
     30 #include "JSFunction.h"
     31 #include "JSGlobalObject.h"
     32 #include "Interpreter.h"
     33 
     34 namespace JSC {
     35     class CachedCall {
     36         WTF_MAKE_NONCOPYABLE(CachedCall); WTF_MAKE_FAST_ALLOCATED;
     37     public:
     38         CachedCall(CallFrame* callFrame, JSFunction* function, int argCount)
     39             : m_valid(false)
     40             , m_interpreter(callFrame->interpreter())
     41             , m_globalObjectScope(callFrame->globalData(), function->scope()->globalObject.get())
     42         {
     43             ASSERT(!function->isHostFunction());
     44             m_closure = m_interpreter->prepareForRepeatCall(function->jsExecutable(), callFrame, function, argCount, function->scope());
     45             m_valid = !callFrame->hadException();
     46         }
     47 
     48         JSValue call()
     49         {
     50             ASSERT(m_valid);
     51             return m_interpreter->execute(m_closure);
     52         }
     53         void setThis(JSValue v) { m_closure.setArgument(0, v); }
     54         void setArgument(int n, JSValue v) { m_closure.setArgument(n + 1, v); }
     55 
     56         CallFrame* newCallFrame(ExecState* exec)
     57         {
     58             CallFrame* callFrame = m_closure.newCallFrame;
     59             callFrame->setScopeChain(exec->scopeChain());
     60             return callFrame;
     61         }
     62 
     63         ~CachedCall()
     64         {
     65             if (m_valid)
     66                 m_interpreter->endRepeatCall(m_closure);
     67         }
     68 
     69     private:
     70         bool m_valid;
     71         Interpreter* m_interpreter;
     72         DynamicGlobalObjectScope m_globalObjectScope;
     73         CallFrameClosure m_closure;
     74     };
     75 }
     76 
     77 #endif
     78