JavaScriptCore-1218.tar.gz

[apple/javascriptcore.git] / interpreter / RegisterFile.h

diff --git a/interpreter/RegisterFile.h b/interpreter/RegisterFile.h
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--- a/interpreter/RegisterFile.h
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-/*
- * Copyright (C) 2008, 2009 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.
- * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
- *     its contributors may be used to endorse or promote products derived
- *     from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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 RegisterFile_h
-#define RegisterFile_h
-
-#include "ExecutableAllocator.h"
-#include "Register.h"
-#include <wtf/Noncopyable.h>
-#include <wtf/PageReservation.h>
-#include <wtf/VMTags.h>
-
-namespace JSC {
-
-    class ConservativeRoots;
-    class DFGCodeBlocks;
-    class LLIntOffsetsExtractor;
-
-    class RegisterFile {
-        WTF_MAKE_NONCOPYABLE(RegisterFile);
-    public:
-        enum CallFrameHeaderEntry {
-            CallFrameHeaderSize = 6,
-
-            ArgumentCount = -6,
-            CallerFrame = -5,
-            Callee = -4,
-            ScopeChain = -3,
-            ReturnPC = -2, // This is either an Instruction* or a pointer into JIT generated code stored as an Instruction*.
-            CodeBlock = -1,
-        };
-
-        static const size_t defaultCapacity = 512 * 1024;
-        static const size_t commitSize = 16 * 1024;
-        // Allow 8k of excess registers before we start trying to reap the registerfile
-        static const ptrdiff_t maxExcessCapacity = 8 * 1024;
-
-        RegisterFile(size_t capacity = defaultCapacity);
-        ~RegisterFile();
-        
-        void gatherConservativeRoots(ConservativeRoots&);
-        void gatherConservativeRoots(ConservativeRoots&, DFGCodeBlocks&);
-
-        Register* begin() const { return static_cast<Register*>(m_reservation.base()); }
-        Register* end() const { return m_end; }
-        size_t size() const { return end() - begin(); }
-
-        bool grow(Register*);
-        void shrink(Register*);
-        
-        static size_t committedByteCount();
-        static void initializeThreading();
-
-        Register* const * addressOfEnd() const
-        {
-            return &m_end;
-        }
-
-    private:
-        friend class LLIntOffsetsExtractor;
-        
-        bool growSlowCase(Register*);
-        void releaseExcessCapacity();
-        void addToCommittedByteCount(long);
-        Register* m_end;
-        Register* m_commitEnd;
-        PageReservation m_reservation;
-    };
-
-    inline RegisterFile::RegisterFile(size_t capacity)
-        : m_end(0)
-    {
-        ASSERT(capacity && isPageAligned(capacity));
-
-        m_reservation = PageReservation::reserve(roundUpAllocationSize(capacity * sizeof(Register), commitSize), OSAllocator::JSVMStackPages);
-        m_end = static_cast<Register*>(m_reservation.base());
-        m_commitEnd = static_cast<Register*>(m_reservation.base());
-    }
-
-    inline void RegisterFile::shrink(Register* newEnd)
-    {
-        if (newEnd >= m_end)
-            return;
-        m_end = newEnd;
-        if (m_end == m_reservation.base() && (m_commitEnd - begin()) >= maxExcessCapacity)
-            releaseExcessCapacity();
-    }
-
-    inline bool RegisterFile::grow(Register* newEnd)
-    {
-        if (newEnd <= m_end)
-            return true;
-        return growSlowCase(newEnd);
-    }
-
-} // namespace JSC
-
-#endif // RegisterFile_h