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/*
* Copyright (C) 2015-2019 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.
*/
#pragma once
#if ENABLE(DFG_JIT)
#include "DFGCommon.h"
#include "DFGInsertionSet.h"
#include <wtf/PrintStream.h>
namespace JSC { namespace DFG {
class LazyNode {
public:
static constexpr size_t jsConstantTag = 0;
static constexpr size_t doubleConstantTag = 1;
static constexpr size_t int52ConstantTag = 2;
static constexpr uintptr_t tagMask = 0x3;
static constexpr uintptr_t pointerMask = ~tagMask;
explicit LazyNode(Node* node = nullptr)
: m_node(node)
, m_value(reinterpret_cast<uintptr_t>(nullptr))
{
if (node && node->isConstant())
setFrozenValue(node->constant(), node->op());
}
explicit LazyNode(FrozenValue* value, NodeType op = JSConstant)
: m_node(nullptr)
, m_value(reinterpret_cast<uintptr_t>(nullptr))
{
setFrozenValue(value, op);
}
LazyNode(std::nullptr_t)
: m_node(nullptr)
, m_value(reinterpret_cast<uintptr_t>(nullptr))
{
}
LazyNode(WTF::HashTableDeletedValueType)
: m_node(reinterpret_cast<Node*>(-1))
{
}
void setNode(Node* node)
{
m_node = node;
if (node && node->isConstant())
setFrozenValue(node->constant(), node->op());
}
bool isHashTableDeletedValue() const { return m_node == reinterpret_cast<Node*>(-1); }
bool isNode() const { return m_node; }
NodeType op() const
{
if (m_node)
return m_node->op();
switch (m_value & tagMask) {
case jsConstantTag:
return JSConstant;
case doubleConstantTag:
return DoubleConstant;
case int52ConstantTag:
return Int52Constant;
default:
RELEASE_ASSERT_NOT_REACHED();
}
}
Node* asNode() const
{
ASSERT(m_node || !asValue());
return m_node;
}
FrozenValue* asValue() const
{
return reinterpret_cast<FrozenValue*>(m_value & pointerMask);
}
unsigned hash() const
{
void* toHash = m_node;
if (FrozenValue* value = asValue())
toHash = value;
return WTF::PtrHash<void*>::hash(toHash);
}
bool operator==(const LazyNode& other) const
{
if (asValue() || other.asValue())
return m_value == other.m_value;
return m_node == other.m_node;
}
Node* ensureIsNode(InsertionSet& insertionSet, BasicBlock* block, unsigned nodeIndex)
{
if (!m_node)
m_node = insertionSet.insertConstant(nodeIndex, block->at(nodeIndex)->origin, asValue(), op());
return asNode();
}
Node* operator->() const { return asNode(); }
Node& operator*() const { return *asNode(); }
bool operator!() const { return !asValue() && !asNode(); }
explicit operator bool() const { return !!*this; }
void dump(PrintStream& out) const;
private:
void setFrozenValue(FrozenValue* value, NodeType op)
{
ASSERT(value);
m_value = reinterpret_cast<uintptr_t>(value);
ASSERT(m_value == (m_value & pointerMask));
switch (op) {
case JSConstant:
m_value |= jsConstantTag;
break;
case DoubleConstant:
m_value |= doubleConstantTag;
break;
case Int52Constant:
m_value |= int52ConstantTag;
break;
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
}
Node* m_node;
uintptr_t m_value;
};
} } // namespace JSC::DFG
namespace WTF {
template<typename T> struct HashTraits;
template<> struct HashTraits<JSC::DFG::LazyNode> : SimpleClassHashTraits<JSC::DFG::LazyNode> {
static constexpr bool emptyValueIsZero = true;
};
} // namespace WTF
#endif // ENABLE(DFG_JIT)
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