| /* |
| * Copyright (C) 2008 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 Label_h |
| #define Label_h |
| |
| #include "CodeBlock.h" |
| #include "Instruction.h" |
| #include <wtf/Assertions.h> |
| #include <wtf/Vector.h> |
| #include <limits.h> |
| |
| namespace JSC { |
| |
| class Label { |
| public: |
| explicit Label(BytecodeGenerator* generator) |
| : m_refCount(0) |
| , m_location(invalidLocation) |
| , m_generator(generator) |
| { |
| } |
| |
| void setLocation(unsigned); |
| |
| int bind(int opcode, int offset) const |
| { |
| if (m_location == invalidLocation) { |
| m_unresolvedJumps.append(std::make_pair(opcode, offset)); |
| return 0; |
| } |
| return m_location - opcode; |
| } |
| |
| void ref() { ++m_refCount; } |
| void deref() |
| { |
| --m_refCount; |
| ASSERT(m_refCount >= 0); |
| } |
| int refCount() const { return m_refCount; } |
| |
| bool isForward() const { return m_location == invalidLocation; } |
| |
| int bind() |
| { |
| ASSERT(!isForward()); |
| return bind(0, 0); |
| } |
| |
| private: |
| typedef Vector<std::pair<int, int>, 8> JumpVector; |
| |
| static const unsigned invalidLocation = UINT_MAX; |
| |
| int m_refCount; |
| unsigned m_location; |
| BytecodeGenerator* m_generator; |
| mutable JumpVector m_unresolvedJumps; |
| }; |
| |
| } // namespace JSC |
| |
| #endif // Label_h |