interpreter/CachedCall.h

   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 : public Noncopyable {
  36     public:
  37         CachedCall(CallFrame* callFrame, JSFunction* function, int argCount, JSValue* exception)
  38             : m_valid(false)
  39             , m_interpreter(callFrame->interpreter())
  40             , m_exception(exception)
  41             , m_globalObjectScope(callFrame, function->scope().globalObject())
  42         {
  43             ASSERT(!function->isHostFunction());
  44             m_closure = m_interpreter->prepareForRepeatCall(function->jsExecutable(), callFrame, function, argCount, function->scope().node(), exception);
  45             m_valid = !*exception;
  46         }
  47
  48         JSValue call()
  49         {
  50             ASSERT(m_valid);
  51             return m_interpreter->execute(m_closure, m_exception);
  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         JSValue* m_exception;
  73         DynamicGlobalObjectScope m_globalObjectScope;
  74         CallFrameClosure m_closure;
  75     };
  76 }
  77
  78 #endif