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DFGDesiredInferredType.h
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132 lines (104 loc) · 3.96 KB
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/*
* Copyright (C) 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 DFGDesiredInferredType_h
#define DFGDesiredInferredType_h
#if ENABLE(DFG_JIT)
#include "InferredType.h"
#include <wtf/HashMap.h>
namespace JSC { namespace DFG {
// This documents the DFG's expectation for an InferredType: specifically, that we want it to have a live
// InferredType object and that this object has the type that we originally saw.
class DesiredInferredType {
public:
DesiredInferredType()
: m_object(nullptr)
{
}
DesiredInferredType(InferredType* object, const InferredType::Descriptor& expected)
: m_object(object)
, m_expected(expected)
{
}
DesiredInferredType(WTF::HashTableDeletedValueType)
: m_object(nullptr)
, m_expected(InferredType::Top)
{
}
explicit operator bool() const { return m_object && m_expected; }
InferredType* object() const { return m_object; }
InferredType::Descriptor expected() const { return m_expected; }
bool isStillValid() const
{
return m_object->canWatch(m_expected);
}
void add(Watchpoint* watchpoint) const
{
m_object->addWatchpoint(watchpoint);
}
bool operator==(const DesiredInferredType& other) const
{
return m_object == other.m_object
&& m_expected == other.m_expected;
}
bool operator!=(const DesiredInferredType& other) const
{
return !(*this == other);
}
bool isHashTableDeletedValue() const
{
return !m_object && m_expected == InferredType::Top;
}
unsigned hash() const
{
return WTF::PtrHash<InferredType*>::hash(m_object) + m_expected.hash() * 7;
}
void dumpInContext(PrintStream& out, DumpContext* context) const
{
out.print(inContext(m_expected, context), " for ", RawPointer(m_object));
}
void dump(PrintStream& out) const
{
dumpInContext(out, nullptr);
}
private:
InferredType* m_object;
InferredType::Descriptor m_expected;
};
struct DesiredInferredTypeHash {
static unsigned hash(const DesiredInferredType& key) { return key.hash(); }
static bool equal(const DesiredInferredType& a, const DesiredInferredType& b) { return a == b; }
static const bool safeToCompareToEmptyOrDeleted = true;
};
} } // namespace JSC::DFG
namespace WTF {
template<typename T> struct DefaultHash;
template<> struct DefaultHash<JSC::DFG::DesiredInferredType> {
typedef JSC::DFG::DesiredInferredTypeHash Hash;
};
template<typename T> struct HashTraits;
template<> struct HashTraits<JSC::DFG::DesiredInferredType> : SimpleClassHashTraits<JSC::DFG::DesiredInferredType> { };
} // namespace WTF
#endif // ENABLE(DFG_JIT)
#endif // DFGDesiredInferredType_h