JavaScriptCore-7600.1.4.11.8.tar.gz

[apple/javascriptcore.git] / bytecode / ExitKind.h

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 * Copyright (C) 2012, 2013, 2014 Apple Inc. All rights reserved.
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#ifndef ExitKind_h
#define ExitKind_h

namespace JSC {

enum ExitKind : uint8_t {
    ExitKindUnset,
    BadType, // We exited because a type prediction was wrong.
    BadFunction, // We exited because we made an incorrect assumption about what function we would see.
    BadExecutable, // We exited because we made an incorrect assumption about what executable we would see.
    BadCache, // We exited because an inline cache was wrong.
    BadWeakConstantCache, // We exited because a cache on a weak constant (usually a prototype) was wrong.
    BadCacheWatchpoint, // Same as BadCache but from a watchpoint.
    BadWeakConstantCacheWatchpoint, // Same as BadWeakConstantCache but from a watchpoint.
    BadIndexingType, // We exited because an indexing type was wrong.
    Overflow, // We exited because of overflow.
    NegativeZero, // We exited because we encountered negative zero.
    Int52Overflow, // We exited because of an Int52 overflow.
    StoreToHole, // We had a store to a hole.
    LoadFromHole, // We had a load from a hole.
    OutOfBounds, // We had an out-of-bounds access to an array.
    InadequateCoverage, // We exited because we ended up in code that didn't have profiling coverage.
    ArgumentsEscaped, // We exited because arguments escaped but we didn't expect them to.
    NotStringObject, // We exited because we shouldn't have attempted to optimize string object access.
    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.
    UncountableInvalidation, // We exited because the code block was invalidated; this means that we've already counted the reasons why the code block was invalidated.
    UncountableWatchpoint, // We exited because of a watchpoint, which isn't counted because watchpoints do tracking themselves.
    WatchdogTimerFired, // We exited because we need to service the watchdog timer.
    DebuggerEvent // We exited because we need to service the debugger.
};

const char* exitKindToString(ExitKind);
bool exitKindIsCountable(ExitKind);

inline bool isWatchpoint(ExitKind kind)
{
    switch (kind) {
    case BadCacheWatchpoint:
    case BadWeakConstantCacheWatchpoint:
    case UncountableWatchpoint:
        return true;
    default:
        return false;
    }
}

} // namespace JSC

namespace WTF {

class PrintStream;
void printInternal(PrintStream&, JSC::ExitKind);

} // namespace WTF

#endif // ExitKind_h