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Viewing changes to Source/JavaScriptCore/bytecode/ResolveOperation.h

  • Committer: Package Import Robot
  • Author(s): Jonathan Riddell
  • Date: 2013-02-18 14:24:18 UTC
  • Revision ID: package-import@ubuntu.com-20130218142418-eon0jmjg3nj438uy
Tags: upstream-2.3
Import upstream version 2.3

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Source/JavaScriptCore/bytecode/ResolveOperation.h
 
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/*
 
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 * Copyright (C) 2012 Apple Inc. All rights reserved.
 
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 *
 
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 * Redistribution and use in source and binary forms, with or without
 
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 * modification, are permitted provided that the following conditions
 
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 * are met:
 
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 * 1. Redistributions of source code must retain the above copyright
 
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 *    notice, this list of conditions and the following disclaimer.
 
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 * 2. Redistributions in binary form must reproduce the above copyright
 
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 *    notice, this list of conditions and the following disclaimer in the
 
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 *    documentation and/or other materials provided with the distribution.
 
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 *
 
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 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 
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 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 
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 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 
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 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 
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 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 
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 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 
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 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
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 */
 
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#ifndef ResolveOperation_h
 
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#define ResolveOperation_h
 
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#include "PropertyOffset.h"
 
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#include "WriteBarrier.h"
 
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#include <wtf/Vector.h>
 
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namespace JSC {
 
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class Structure;
 
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struct ResolveOperation {
 
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    typedef enum {
 
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        Fail,
 
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        SetBaseToUndefined,
 
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        ReturnScopeAsBase,
 
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        SetBaseToScope,
 
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        SetBaseToGlobal,
 
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        GetAndReturnScopedVar,
 
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        GetAndReturnGlobalVar,
 
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        GetAndReturnGlobalVarWatchable,
 
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        SkipTopScopeNode,
 
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        SkipScopes,
 
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        ReturnGlobalObjectAsBase,
 
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        GetAndReturnGlobalProperty,
 
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        CheckForDynamicEntriesBeforeGlobalScope
 
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    } ResolveOperationType;
 
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    ResolveOperationType m_operation;
 
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    WriteBarrier<Structure> m_structure;
 
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    union {
 
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        PropertyOffset m_offset;
 
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        WriteBarrier<Unknown>* m_registerAddress;
 
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        int m_scopesToSkip;
 
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        int m_activationRegister;
 
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    };
 
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    static ResolveOperation getAndReturnScopedVar(PropertyOffset offset)
 
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    {
 
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        ResolveOperation op;
 
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        op.m_operation = GetAndReturnScopedVar;
 
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        op.m_offset = offset;
 
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        return op;
 
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    }
 
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    static ResolveOperation checkForDynamicEntriesBeforeGlobalScope()
 
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    {
 
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        ResolveOperation op;
 
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        op.m_operation = CheckForDynamicEntriesBeforeGlobalScope;
 
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        return op;
 
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    }
 
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    static ResolveOperation getAndReturnGlobalVar(WriteBarrier<Unknown>* registerAddress, bool couldBeWatched)
 
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    {
 
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        ResolveOperation op;
 
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        op.m_operation = couldBeWatched ? GetAndReturnGlobalVarWatchable : GetAndReturnGlobalVar;
 
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        op.m_registerAddress = registerAddress;
 
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        return op;
 
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    }
 
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    static ResolveOperation getAndReturnGlobalProperty()
 
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    {
 
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        ResolveOperation op;
 
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        op.m_operation = GetAndReturnGlobalProperty;
 
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        return op;
 
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    }
 
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    static ResolveOperation resolveFail()
 
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    {
 
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        ResolveOperation op;
 
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        op.m_operation = Fail;
 
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        return op;
 
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    }
 
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    static ResolveOperation skipTopScopeNode(int activationRegister)
 
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    {
 
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        ResolveOperation op;
 
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        op.m_operation = SkipTopScopeNode;
 
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        op.m_activationRegister = activationRegister;
 
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        return op;
 
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    }
 
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    static ResolveOperation skipScopes(int scopesToSkip)
 
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    {
 
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        ResolveOperation op;
 
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        op.m_operation = SkipScopes;
 
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        op.m_scopesToSkip = scopesToSkip;
 
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        return op;
 
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    }
 
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    static ResolveOperation returnGlobalObjectAsBase()
 
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    {
 
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        ResolveOperation op;
 
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        op.m_operation = ReturnGlobalObjectAsBase;
 
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        return op;
 
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    }
 
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    static ResolveOperation setBaseToGlobal()
 
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    {
 
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        ResolveOperation op;
 
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        op.m_operation = SetBaseToGlobal;
 
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        return op;
 
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    }
 
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    static ResolveOperation setBaseToUndefined()
 
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    {
 
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        ResolveOperation op;
 
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        op.m_operation = SetBaseToUndefined;
 
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        return op;
 
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    }
 
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    static ResolveOperation setBaseToScope()
 
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    {
 
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        ResolveOperation op;
 
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        op.m_operation = SetBaseToScope;
 
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        return op;
 
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    }
 
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    static ResolveOperation returnScopeAsBase()
 
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    {
 
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        ResolveOperation op;
 
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        op.m_operation = ReturnScopeAsBase;
 
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        return op;
 
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    }
 
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};
 
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typedef Vector<ResolveOperation> ResolveOperations;
 
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struct PutToBaseOperation {
 
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    PutToBaseOperation(bool isStrict)
 
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        : m_kind(Uninitialised)
 
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        , m_isDynamic(false)
 
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        , m_isStrict(isStrict)
 
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        , m_predicatePointer(0)
 
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    {
 
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    }
 
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    enum Kind { Uninitialised, Generic, Readonly, GlobalVariablePut, GlobalVariablePutChecked, GlobalPropertyPut, VariablePut };
 
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    union {
 
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        Kind m_kind : 8;
 
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        uint8_t m_kindAsUint8;
 
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    };
 
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    bool m_isDynamic : 8;
 
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    bool m_isStrict : 8;
 
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    union {
 
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        bool* m_predicatePointer;
 
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        unsigned m_scopeDepth;
 
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    };
 
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    WriteBarrier<Structure> m_structure;
 
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    union {
 
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        // Used for GlobalVariablePut
 
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        WriteBarrier<Unknown>* m_registerAddress;
 
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        // Used for GlobalPropertyPut and VariablePut
 
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        struct {
 
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            PropertyOffset m_offset;
 
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            int32_t m_offsetInButterfly;
 
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        };
 
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    };
 
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};
 
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}
 
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#endif // ResolveOperation_h