bytecode/HandlerInfo.h

   1 /*
   2  * Copyright (C) 2012 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. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef HandlerInfo_h
  27 #define HandlerInfo_h
  28
  29 #include "CodeLocation.h"
  30
  31 namespace JSC {
  32
  33 enum class HandlerType {
  34     Illegal = 0,
  35     Catch = 1,
  36     Finally = 2,
  37     SynthesizedFinally = 3
  38 };
  39
  40 struct HandlerInfoBase {
  41     HandlerType type() const { return static_cast<HandlerType>(typeBits); }
  42     void setType(HandlerType type) { typeBits = static_cast<uint32_t>(type); }
  43
  44     const char* typeName()
  45     {
  46         switch (type()) {
  47         case HandlerType::Catch:
  48             return "catch";
  49         case HandlerType::Finally:
  50             return "finally";
  51         case HandlerType::SynthesizedFinally:
  52             return "synthesized finally";
  53         default:
  54             ASSERT_NOT_REACHED();
  55         }
  56         return nullptr;
  57     }
  58
  59     bool isCatchHandler() const { return type() == HandlerType::Catch; }
  60
  61     uint32_t start;
  62     uint32_t end;
  63     uint32_t target;
  64     uint32_t scopeDepth : 30;
  65     uint32_t typeBits : 2; // HandlerType
  66 };
  67
  68 struct UnlinkedHandlerInfo : public HandlerInfoBase {
  69     UnlinkedHandlerInfo(uint32_t start, uint32_t end, uint32_t target, uint32_t scopeDepth, HandlerType handlerType)
  70     {
  71         this->start = start;
  72         this->end = end;
  73         this->target = target;
  74         this->scopeDepth = scopeDepth;
  75         setType(handlerType);
  76         ASSERT(type() == handlerType);
  77     }
  78 };
  79
  80 struct HandlerInfo : public HandlerInfoBase {
  81     void initialize(const UnlinkedHandlerInfo& unlinkedInfo, size_t nonLocalScopeDepth)
  82     {
  83         start = unlinkedInfo.start;
  84         end = unlinkedInfo.end;
  85         target = unlinkedInfo.target;
  86         scopeDepth = unlinkedInfo.scopeDepth + nonLocalScopeDepth;
  87         typeBits = unlinkedInfo.typeBits;
  88     }
  89
  90 #if ENABLE(JIT)
  91     void initialize(const UnlinkedHandlerInfo& unlinkedInfo, size_t nonLocalScopeDepth, CodeLocationLabel label)
  92     {
  93         initialize(unlinkedInfo, nonLocalScopeDepth);
  94         nativeCode = label;
  95     }
  96
  97     CodeLocationLabel nativeCode;
  98 #endif
  99 };
 100
 101 } // namespace JSC
 102
 103 #endif // HandlerInfo_h
 104