blob: 3554c7cd99e2dafaa88921d46815f2328f774fb2 [file] [log] [blame]
/*
* Copyright (C) 2018 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.
*/
#include "config.h"
#include "InstanceOfStatus.h"
#include "ICStatusUtils.h"
#include "InstanceOfAccessCase.h"
#include "JSCInlines.h"
#include "PolymorphicAccess.h"
#include "StructureStubInfo.h"
namespace JSC {
void InstanceOfStatus::appendVariant(const InstanceOfVariant& variant)
{
appendICStatusVariant(m_variants, variant);
}
InstanceOfStatus InstanceOfStatus::computeFor(
CodeBlock* codeBlock, ICStatusMap& infoMap, BytecodeIndex bytecodeIndex)
{
ConcurrentJSLocker locker(codeBlock->m_lock);
InstanceOfStatus result;
#if ENABLE(DFG_JIT)
result = computeForStubInfo(locker, codeBlock->vm(), infoMap.get(CodeOrigin(bytecodeIndex)).stubInfo);
if (!result.takesSlowPath()) {
UnlinkedCodeBlock* unlinkedCodeBlock = codeBlock->unlinkedCodeBlock();
ConcurrentJSLocker locker(unlinkedCodeBlock->m_lock);
// We also check for BadType here in case this is "primitive instanceof Foo".
if (unlinkedCodeBlock->hasExitSite(locker, DFG::FrequentExitSite(bytecodeIndex, BadCache))
|| unlinkedCodeBlock->hasExitSite(locker, DFG::FrequentExitSite(bytecodeIndex, BadConstantCache))
|| unlinkedCodeBlock->hasExitSite(locker, DFG::FrequentExitSite(bytecodeIndex, BadType)))
return TakesSlowPath;
}
#else
UNUSED_PARAM(infoMap);
UNUSED_PARAM(bytecodeIndex);
#endif
return result;
}
#if ENABLE(DFG_JIT)
InstanceOfStatus InstanceOfStatus::computeForStubInfo(const ConcurrentJSLocker&, VM& vm, StructureStubInfo* stubInfo)
{
// FIXME: We wouldn't have to bail for nonCell if we taught MatchStructure how to handle non
// cells. If we fixed that then we wouldn't be able to use summary();
// https://bugs.webkit.org/show_bug.cgi?id=185784
StubInfoSummary summary = StructureStubInfo::summary(vm, stubInfo);
if (!isInlineable(summary))
return InstanceOfStatus(summary);
if (stubInfo->cacheType() != CacheType::Stub)
return TakesSlowPath; // This is conservative. It could be that we have no information.
PolymorphicAccess* list = stubInfo->u.stub;
InstanceOfStatus result;
for (unsigned listIndex = 0; listIndex < list->size(); ++listIndex) {
const AccessCase& access = list->at(listIndex);
if (access.type() == AccessCase::InstanceOfGeneric)
return TakesSlowPath;
if (!access.conditionSet().structuresEnsureValidity())
return TakesSlowPath;
result.appendVariant(InstanceOfVariant(
access.structure(),
access.conditionSet(),
access.as<InstanceOfAccessCase>().prototype(),
access.type() == AccessCase::InstanceOfHit));
}
return result;
}
#endif // ENABLE(DFG_JIT)
JSObject* InstanceOfStatus::commonPrototype() const
{
JSObject* prototype = nullptr;
for (const InstanceOfVariant& variant : m_variants) {
if (!prototype) {
prototype = variant.prototype();
continue;
}
if (prototype != variant.prototype())
return nullptr;
}
return prototype;
}
void InstanceOfStatus::filter(const StructureSet& structureSet)
{
if (m_state != Simple)
return;
filterICStatusVariants(m_variants, structureSet);
if (m_variants.isEmpty())
m_state = NoInformation;
}
} // namespace JSC