bytecode/BytecodeLivenessAnalysisInlines.h

   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
  33 namespace JSC {
  34
  35 inline 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
  42 inline 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
  53 inline 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