author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Fri, 17 Sep 2010 09:02:29 +0300 | |
changeset 0 | 4f2f89ce4247 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (C) 2008 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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* |
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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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* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
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* its contributors may be used to endorse or promote products derived |
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* from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY |
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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* ON ANY THEORY 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 OF |
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#ifndef Label_h |
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#define Label_h |
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#include "CodeBlock.h" |
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#include "Instruction.h" |
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#include <wtf/Assertions.h> |
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#include <wtf/Vector.h> |
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#include <limits.h> |
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namespace JSC { |
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class Label { |
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public: |
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explicit Label(CodeBlock* codeBlock) |
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: m_refCount(0) |
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, m_location(invalidLocation) |
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, m_codeBlock(codeBlock) |
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{ |
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} |
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void setLocation(unsigned location) |
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{ |
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m_location = location; |
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unsigned size = m_unresolvedJumps.size(); |
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for (unsigned i = 0; i < size; ++i) |
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m_codeBlock->instructions()[m_unresolvedJumps[i].second].u.operand = m_location - m_unresolvedJumps[i].first; |
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} |
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int bind(int opcode, int offset) const |
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{ |
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if (m_location == invalidLocation) { |
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m_unresolvedJumps.append(std::make_pair(opcode, offset)); |
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return 0; |
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} |
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return m_location - opcode; |
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} |
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void ref() { ++m_refCount; } |
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void deref() |
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{ |
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--m_refCount; |
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ASSERT(m_refCount >= 0); |
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} |
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int refCount() const { return m_refCount; } |
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bool isForward() const { return m_location == invalidLocation; } |
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private: |
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typedef Vector<std::pair<int, int>, 8> JumpVector; |
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static const unsigned invalidLocation = UINT_MAX; |
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int m_refCount; |
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unsigned m_location; |
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CodeBlock* m_codeBlock; |
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mutable JumpVector m_unresolvedJumps; |
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}; |
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} // namespace JSC |
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#endif // Label_h |