android_external_webkit/JavaScriptCore/bytecompiler/Label.h at froyo · Y6b/android_external_webkit · GitHub

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* 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(CodeBlock* codeBlock)

: m_refCount(0)

, m_location(invalidLocation)

, m_codeBlock(codeBlock)

{

}

void setLocation(unsigned location)

{

m_location = location;

unsigned size = m_unresolvedJumps.size();

for (unsigned i = 0; i < size; ++i)

m_codeBlock->instructions()[m_unresolvedJumps[i].second].u.operand = m_location - m_unresolvedJumps[i].first;

}

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; }

private:

typedef Vector<std::pair<int, int>, 8> JumpVector;

static const unsigned invalidLocation = UINT_MAX;

int m_refCount;

unsigned m_location;

CodeBlock* m_codeBlock;

mutable JumpVector m_unresolvedJumps;

};

} // namespace JSC

#endif // Label_h

android_external_webkit/JavaScriptCore/bytecompiler/Label.h at froyo · Y6b/android_external_webkit · GitHub

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