1/*
2 * Copyright (C) 2013 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef BytecodeLivenessAnalysisInlines_h
27#define BytecodeLivenessAnalysisInlines_h
28
29#include "BytecodeLivenessAnalysis.h"
30#include "CodeBlock.h"
31#include "Operations.h"
32
33namespace JSC {
34
35inline bool operandIsAlwaysLive(CodeBlock* codeBlock, int operand)
36{
37    if (VirtualRegister(operand).isArgument())
38        return true;
39    return operand <= codeBlock->captureStart() && operand > codeBlock->captureEnd();
40}
41
42inline bool operandThatIsNotAlwaysLiveIsLive(CodeBlock* codeBlock, const FastBitVector& out, int operand)
43{
44    VirtualRegister virtualReg(operand);
45    if (virtualReg.offset() > codeBlock->captureStart())
46        return out.get(virtualReg.toLocal());
47    size_t index = virtualReg.toLocal() - codeBlock->captureCount();
48    if (index >= out.numBits())
49        return false;
50    return out.get(index);
51}
52
53inline bool operandIsLive(CodeBlock* codeBlock, const FastBitVector& out, int operand)
54{
55    return operandIsAlwaysLive(codeBlock, operand) || operandThatIsNotAlwaysLiveIsLive(codeBlock, out, operand);
56}
57
58} // namespace JSC
59
60#endif // BytecodeLivenessAnalysisInlines_h
61
62