runtime/JSNameScope.h

   1 /*
   2  * Copyright (C) 2008, 2009, 2015 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 JSNameScope_h
  27 #define JSNameScope_h
  28
  29 #include "JSEnvironmentRecord.h"
  30 #include "JSGlobalObject.h"
  31
  32 namespace JSC {
  33
  34 // Used for scopes with a single named variable: catch and named function expression.
  35 class JSNameScope : public JSEnvironmentRecord {
  36 public:
  37     typedef JSEnvironmentRecord Base;
  38     static const unsigned StructureFlags = Base::StructureFlags| OverridesGetOwnPropertySlot;
  39
  40     enum Type {
  41         CatchScope,
  42         FunctionNameScope
  43     };
  44
  45     template<typename T>
  46     static T* create(VM& vm, JSGlobalObject* globalObject, JSScope* currentScope, SymbolTable* symbolTable, JSValue value)
  47     {
  48         T* scopeObject = new (
  49             NotNull, allocateCell<T>(vm.heap, allocationSizeForScopeSize(1)))
  50             T(vm, globalObject, currentScope, symbolTable);
  51         scopeObject->finishCreation(vm, value);
  52         return scopeObject;
  53     }
  54
  55     static JSNameScope* create(VM&, JSGlobalObject*, JSScope* currentScope, SymbolTable*, JSValue, Type);
  56
  57     static JSValue toThis(JSCell*, ExecState*, ECMAMode);
  58     static bool getOwnPropertySlot(JSObject*, ExecState*, PropertyName, PropertySlot&);
  59     static void put(JSCell*, ExecState*, PropertyName, JSValue, PutPropertySlot&);
  60
  61     DECLARE_INFO;
  62
  63     JSValue value() { return variableAt(ScopeOffset(0)).get(); }
  64
  65 protected:
  66     void finishCreation(VM& vm, JSValue value)
  67     {
  68         Base::finishCreationUninitialized(vm);
  69         variableAt(ScopeOffset(0)).set(vm, this, value);
  70     }
  71
  72     JSNameScope(VM& vm, Structure* structure, JSScope* next, SymbolTable* symbolTable)
  73         : Base(vm, structure, next, symbolTable)
  74     {
  75         ASSERT(symbolTable->scopeSize() == 1);
  76     }
  77 };
  78
  79 }
  80
  81 #endif // JSNameScope_h