bytecode/ExitKind.h

   1 /*
   2  * Copyright (C) 2012-2015 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:
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   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     BadCell, // We exited because we made an incorrect assumption about what cell we would see. Usually used for function checks.
  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     BadConstantCache, // We exited because a cache on a weak constant (usually a prototype) was wrong.
  38     BadIndexingType, // We exited because an indexing type was wrong.
  39     Overflow, // We exited because of overflow.
  40     NegativeZero, // We exited because we encountered negative zero.
  41     Int52Overflow, // We exited because of an Int52 overflow.
  42     StoreToHole, // We had a store to a hole.
  43     LoadFromHole, // We had a load from a hole.
  44     OutOfBounds, // We had an out-of-bounds access to an array.
  45     InadequateCoverage, // We exited because we ended up in code that didn't have profiling coverage.
  46     ArgumentsEscaped, // We exited because arguments escaped but we didn't expect them to.
  47     ExoticObjectMode, // We exited because some exotic object that we were accessing was in an exotic mode (like Arguments with slow arguments).
  48     NotStringObject, // We exited because we shouldn't have attempted to optimize string object access.
  49     VarargsOverflow, // We exited because a varargs call passed more arguments than we expected.
  50     TDZFailure, // We exited because we were in the TDZ and accessed the variable.
  51     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.
  52     UncountableInvalidation, // We exited because the code block was invalidated; this means that we've already counted the reasons why the code block was invalidated.
  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 } // namespace JSC
  61
  62 namespace WTF {
  63
  64 class PrintStream;
  65 void printInternal(PrintStream&, JSC::ExitKind);
  66
  67 } // namespace WTF
  68
  69 #endif // ExitKind_h
  70