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-rw-r--r--Source/JavaScriptCore/runtime/ScopedArgumentsTable.h96
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diff --git a/Source/JavaScriptCore/runtime/ScopedArgumentsTable.h b/Source/JavaScriptCore/runtime/ScopedArgumentsTable.h
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--- a/Source/JavaScriptCore/runtime/ScopedArgumentsTable.h
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-/*
- * Copyright (C) 2015 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 ScopedArgumentsTable_h
-#define ScopedArgumentsTable_h
-
-#include "JSCell.h"
-#include "ScopeOffset.h"
-#include <wtf/Assertions.h>
-
-namespace JSC {
-
-// This class's only job is to hold onto the list of ScopeOffsets for each argument that a
-// function has. Most of the time, the BytecodeGenerator will create one of these and it will
-// never be modified subsequently. There is a rare case where a ScopedArguments object is created
-// and aliases one of these and then decides to modify it; in that case we do copy-on-write. This
-// makes sense because such modifications are so uncommon. You'd have to do something crazy like
-// "delete arguments[i]" or some variant of defineOwnProperty.
-class ScopedArgumentsTable final : public JSCell {
-public:
- typedef JSCell Base;
- static const unsigned StructureFlags = Base::StructureFlags | StructureIsImmortal;
-
-private:
- ScopedArgumentsTable(VM&);
- ~ScopedArgumentsTable();
-
-public:
- static ScopedArgumentsTable* create(VM&);
- static ScopedArgumentsTable* create(VM&, uint32_t length);
-
- static const bool needsDestruction = true;
- static void destroy(JSCell*);
-
- ScopedArgumentsTable* clone(VM&);
-
- uint32_t length() const { return m_length; }
- ScopedArgumentsTable* setLength(VM&, uint32_t newLength);
-
- ScopeOffset get(uint32_t i) const
- {
- return const_cast<ScopedArgumentsTable*>(this)->at(i);
- }
-
- void lock()
- {
- m_locked = true;
- }
-
- ScopedArgumentsTable* set(VM&, uint32_t index, ScopeOffset);
-
- DECLARE_INFO;
-
- static Structure* createStructure(VM&, JSGlobalObject*, JSValue prototype);
-
- static ptrdiff_t offsetOfLength() { return OBJECT_OFFSETOF(ScopedArgumentsTable, m_length); }
- static ptrdiff_t offsetOfArguments() { return OBJECT_OFFSETOF(ScopedArgumentsTable, m_arguments); }
-
-private:
- ScopeOffset& at(uint32_t i)
- {
- ASSERT_WITH_SECURITY_IMPLICATION(i < m_length);
- return m_arguments[i];
- }
-
- uint32_t m_length;
- bool m_locked; // Being locked means that there are multiple references to this object and none of them expect to see the others' modifications. This means that modifications need to make a copy first.
- std::unique_ptr<ScopeOffset[]> m_arguments;
-};
-
-} // namespace JSC
-
-#endif // ScopedArgumentsTable_h
-