1/*
2 * Copyright (C) 2012-2016 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#pragma once
27
28namespace JSC {
29
30enum ExitKind : uint8_t {
31 ExitKindUnset,
32 BadType, // We exited because a type prediction was wrong.
33 BadCell, // We exited because we made an incorrect assumption about what cell we would see. Usually used for function checks.
34 BadIdent, // We exited because we made an incorrect assumption about what identifier we would see. Usually used for cached Id check in get_by_val.
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 BadTypeInfoFlags, // We exited because we made an incorrect assumption about what TypeInfo flags we would see.
40 Overflow, // We exited because of overflow.
41 NegativeZero, // We exited because we encountered negative zero.
42 Int52Overflow, // We exited because of an Int52 overflow.
43 StoreToHole, // We had a store to a hole.
44 LoadFromHole, // We had a load from a hole.
45 OutOfBounds, // We had an out-of-bounds access to an array.
46 InadequateCoverage, // We exited because we ended up in code that didn't have profiling coverage.
47 ArgumentsEscaped, // We exited because arguments escaped but we didn't expect them to.
48 ExoticObjectMode, // We exited because some exotic object that we were accessing was in an exotic mode (like Arguments with slow arguments).
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 HoistingFailed, // Something that was hoisted exited. So, assume that hoisting is a bad idea.
52 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.
53 UncountableInvalidation, // We exited because the code block was invalidated; this means that we've already counted the reasons why the code block was invalidated.
54 WatchdogTimerFired, // We exited because we need to service the watchdog timer.
55 DebuggerEvent, // We exited because we need to service the debugger.
56 ExceptionCheck, // We exited because a direct exception check showed that we threw an exception from a C call.
57 GenericUnwind, // We exited because a we arrived at this OSR exit from genericUnwind.
58};
59
60const char* exitKindToString(ExitKind);
61bool exitKindMayJettison(ExitKind);
62
63} // namespace JSC
64
65namespace WTF {
66
67class PrintStream;
68void printInternal(PrintStream&, JSC::ExitKind);
69
70} // namespace WTF
71