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author | Lorry Tar Creator <lorry-tar-importer@lorry> | 2015-05-20 09:56:07 +0000 |
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committer | Lorry Tar Creator <lorry-tar-importer@lorry> | 2015-05-20 09:56:07 +0000 |
commit | 41386e9cb918eed93b3f13648cbef387e371e451 (patch) | |
tree | a97f9d7bd1d9d091833286085f72da9d83fd0606 /Source/JavaScriptCore/bytecode/ComplexGetStatus.h | |
parent | e15dd966d523731101f70ccf768bba12435a0208 (diff) | |
download | WebKitGtk-tarball-41386e9cb918eed93b3f13648cbef387e371e451.tar.gz |
webkitgtk-2.4.9webkitgtk-2.4.9
Diffstat (limited to 'Source/JavaScriptCore/bytecode/ComplexGetStatus.h')
-rw-r--r-- | Source/JavaScriptCore/bytecode/ComplexGetStatus.h | 114 |
1 files changed, 0 insertions, 114 deletions
diff --git a/Source/JavaScriptCore/bytecode/ComplexGetStatus.h b/Source/JavaScriptCore/bytecode/ComplexGetStatus.h deleted file mode 100644 index a06e995d5..000000000 --- a/Source/JavaScriptCore/bytecode/ComplexGetStatus.h +++ /dev/null @@ -1,114 +0,0 @@ -/* - * Copyright (C) 2014, 2015 Apple Inc. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY - * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR - * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR - * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, - * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, - * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR - * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY - * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#ifndef ComplexGetStatus_h -#define ComplexGetStatus_h - -#include "JSCJSValue.h" -#include "ObjectPropertyConditionSet.h" -#include "PropertyOffset.h" - -namespace JSC { - -class CodeBlock; -class StructureChain; - -// This class is useful for figuring out how to inline a cached get-like access. We -// say "get-like" because this is appropriate for loading the GetterSetter object in -// a put_by_id that hits a setter. Notably, this doesn't figure out how to call -// accessors, or even whether they should be called. What it gives us, is a way of -// determining how to load the value from the requested property (identified by a -// StringImpl* uid) from an object of the given structure in the given CodeBlock, -// assuming that such an access had already been cached by Repatch (and so Repatch had -// already done a bunch of safety checks). This doesn't reexecute any checks that -// Repatch would have executed, and for prototype chain accesses, it doesn't ask the -// objects in the prototype chain whether their getOwnPropertySlot would attempt to -// intercept the access - so this really is only appropriate if you already know that -// one of the JITOperations had OK'd this for caching and that Repatch concurred. -// -// The typical use pattern is something like: -// -// ComplexGetStatus status = ComplexGetStatus::computeFor(...); -// switch (status.kind()) { -// case ComplexGetStatus::ShouldSkip: -// // Handle the case where this kind of access is possibly safe but wouldn't -// // pass the required safety checks. For example, if an IC gives us a list of -// // accesses and one of them is ShouldSkip, then we should pretend as if it -// // wasn't even there. -// break; -// case ComplexGetStatus::TakesSlowPath: -// // This kind of access is not safe to inline. Bail out of any attempst to -// // inline. -// break; -// case ComplexGetStatus::Inlineable: -// // The good stuff goes here. If it's Inlineable then the other properties of -// // the 'status' object will tell you everything you need to know about how -// // to execute the get-like operation. -// break; -// } - -class ComplexGetStatus { -public: - enum Kind { - ShouldSkip, - TakesSlowPath, - Inlineable - }; - - ComplexGetStatus() - : m_kind(ShouldSkip) - , m_offset(invalidOffset) - { - } - - static ComplexGetStatus skip() - { - return ComplexGetStatus(); - } - - static ComplexGetStatus takesSlowPath() - { - ComplexGetStatus result; - result.m_kind = TakesSlowPath; - return result; - } - - static ComplexGetStatus computeFor( - Structure* headStructure, const ObjectPropertyConditionSet&, UniquedStringImpl* uid); - - Kind kind() const { return m_kind; } - PropertyOffset offset() const { return m_offset; } - const ObjectPropertyConditionSet& conditionSet() const { return m_conditionSet; } - -private: - Kind m_kind; - PropertyOffset m_offset; - ObjectPropertyConditionSet m_conditionSet; -}; - -} // namespace JSC - -#endif // ComplexGetStatus_h - |