bytecode/ExitKind.h

   1 /*
   2  * Copyright (C) 2012, 2013, 2014 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
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  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef ExitKind_h
  27 #define ExitKind_h
  28
  29 namespace JSC {
  30
  31 enum ExitKind : uint8_t {
  32     ExitKindUnset,
  33     BadType, // We exited because a type prediction was wrong.
  34     BadFunction, // We exited because we made an incorrect assumption about what function we would see.
  35     BadExecutable, // We exited because we made an incorrect assumption about what executable we would see.
  36     BadCache, // We exited because an inline cache was wrong.
  37     BadWeakConstantCache, // We exited because a cache on a weak constant (usually a prototype) was wrong.
  38     BadCacheWatchpoint, // Same as BadCache but from a watchpoint.
  39     BadWeakConstantCacheWatchpoint, // Same as BadWeakConstantCache but from a watchpoint.
  40     BadIndexingType, // We exited because an indexing type was wrong.
  41     Overflow, // We exited because of overflow.
  42     NegativeZero, // We exited because we encountered negative zero.
  43     Int52Overflow, // We exited because of an Int52 overflow.
  44     StoreToHole, // We had a store to a hole.
  45     LoadFromHole, // We had a load from a hole.
  46     OutOfBounds, // We had an out-of-bounds access to an array.
  47     InadequateCoverage, // We exited because we ended up in code that didn't have profiling coverage.
  48     ArgumentsEscaped, // We exited because arguments escaped but we didn't expect them to.
  49     NotStringObject, // We exited because we shouldn't have attempted to optimize string object access.
  50     Uncountable, // We exited for none of the above reasons, and we should not count it. Most uses of this should be viewed as a FIXME.
  51     UncountableInvalidation, // We exited because the code block was invalidated; this means that we've already counted the reasons why the code block was invalidated.
  52     UncountableWatchpoint, // We exited because of a watchpoint, which isn't counted because watchpoints do tracking themselves.
  53     WatchdogTimerFired, // We exited because we need to service the watchdog timer.
  54     DebuggerEvent // We exited because we need to service the debugger.
  55 };
  56
  57 const char* exitKindToString(ExitKind);
  58 bool exitKindIsCountable(ExitKind);
  59
  60 inline bool isWatchpoint(ExitKind kind)
  61 {
  62     switch (kind) {
  63     case BadCacheWatchpoint:
  64     case BadWeakConstantCacheWatchpoint:
  65     case UncountableWatchpoint:
  66         return true;
  67     default:
  68         return false;
  69     }
  70 }
  71
  72 } // namespace JSC
  73
  74 namespace WTF {
  75
  76 class PrintStream;
  77 void printInternal(PrintStream&, JSC::ExitKind);
  78
  79 } // namespace WTF
  80
  81 #endif // ExitKind_h
  82