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authorLorry Tar Creator <lorry-tar-importer@lorry>2015-05-20 09:56:07 +0000
committerLorry Tar Creator <lorry-tar-importer@lorry>2015-05-20 09:56:07 +0000
commit41386e9cb918eed93b3f13648cbef387e371e451 (patch)
treea97f9d7bd1d9d091833286085f72da9d83fd0606 /Source/JavaScriptCore/bytecode/ComplexGetStatus.h
parente15dd966d523731101f70ccf768bba12435a0208 (diff)
downloadWebKitGtk-tarball-41386e9cb918eed93b3f13648cbef387e371e451.tar.gz
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-/*
- * 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
-