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/*
* Copyright (C) 2012 Apple Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef JSScope_h
#define JSScope_h
#include "JSObject.h"
#include "ResolveOperation.h"
namespace JSC {
class ScopeChainIterator;
class JSScope : public JSNonFinalObject {
public:
typedef JSNonFinalObject Base;
friend class LLIntOffsetsExtractor;
static size_t offsetOfNext();
JS_EXPORT_PRIVATE static JSObject* objectAtScope(JSScope*);
static JSValue resolve(CallFrame*, const Identifier&, ResolveOperations*);
static JSValue resolveBase(CallFrame*, const Identifier&, bool isStrict, ResolveOperations*, PutToBaseOperation*);
static JSValue resolveWithBase(CallFrame*, const Identifier&, Register* base, ResolveOperations*, PutToBaseOperation*);
static JSValue resolveWithThis(CallFrame*, const Identifier&, Register* base, ResolveOperations*);
static JSValue resolveGlobal(CallFrame*, const Identifier&, JSGlobalObject*, ResolveOperation*);
static void resolvePut(CallFrame*, JSValue base, const Identifier&, JSValue, PutToBaseOperation*);
static void visitChildren(JSCell*, SlotVisitor&);
bool isDynamicScope(bool& requiresDynamicChecks) const;
ScopeChainIterator begin();
ScopeChainIterator end();
JSScope* next();
int localDepth();
JSGlobalObject* globalObject();
VM* vm();
JSObject* globalThis();
protected:
JSScope(VM&, Structure*, JSScope* next);
static const unsigned StructureFlags = OverridesVisitChildren | Base::StructureFlags;
private:
WriteBarrier<JSScope> m_next;
enum ReturnValues {
ReturnValue = 1,
ReturnBase = 2,
ReturnThis = 4,
ReturnBaseAndValue = ReturnValue | ReturnBase,
ReturnThisAndValue = ReturnValue | ReturnThis,
};
enum LookupMode { UnknownResolve, KnownResolve };
template <LookupMode, ReturnValues> static JSObject* resolveContainingScopeInternal(CallFrame*, const Identifier&, PropertySlot&, ResolveOperations*, PutToBaseOperation*, bool isStrict);
template <ReturnValues> static JSObject* resolveContainingScope(CallFrame*, const Identifier&, PropertySlot&, ResolveOperations*, PutToBaseOperation*, bool isStrict);
};
inline JSScope::JSScope(VM& vm, Structure* structure, JSScope* next)
: Base(vm, structure)
, m_next(vm, this, next, WriteBarrier<JSScope>::MayBeNull)
{
}
class ScopeChainIterator {
public:
ScopeChainIterator(JSScope* node)
: m_node(node)
{
}
JSObject* get() const { return JSScope::objectAtScope(m_node); }
JSObject* operator->() const { return JSScope::objectAtScope(m_node); }
ScopeChainIterator& operator++() { m_node = m_node->next(); return *this; }
// postfix ++ intentionally omitted
bool operator==(const ScopeChainIterator& other) const { return m_node == other.m_node; }
bool operator!=(const ScopeChainIterator& other) const { return m_node != other.m_node; }
private:
JSScope* m_node;
};
inline ScopeChainIterator JSScope::begin()
{
return ScopeChainIterator(this);
}
inline ScopeChainIterator JSScope::end()
{
return ScopeChainIterator(0);
}
inline JSScope* JSScope::next()
{
return m_next.get();
}
inline JSGlobalObject* JSScope::globalObject()
{
return structure()->globalObject();
}
inline VM* JSScope::vm()
{
return Heap::heap(this)->vm();
}
inline Register& Register::operator=(JSScope* scope)
{
*this = JSValue(scope);
return *this;
}
inline JSScope* Register::scope() const
{
return jsCast<JSScope*>(jsValue());
}
inline VM& ExecState::vm() const
{
ASSERT(scope()->vm());
return *scope()->vm();
}
inline JSGlobalObject* ExecState::lexicalGlobalObject() const
{
return scope()->globalObject();
}
inline JSObject* ExecState::globalThisValue() const
{
return scope()->globalThis();
}
inline size_t JSScope::offsetOfNext()
{
return OBJECT_OFFSETOF(JSScope, m_next);
}
} // namespace JSC
#endif // JSScope_h
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