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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.
*/
#pragma once
#if ENABLE(DFG_JIT)
#include "DFGRegisteredStructureSet.h"
#include "DumpContext.h"
#include "StructureSet.h"
namespace JSC { namespace DFG {
class FrozenValue;
class GetByOffsetMethod {
public:
enum Kind {
Invalid,
// Constant might mean either that we have some fixed property or that the
// property is unset and we know the result is undefined. We don't distingish
// between these cases because no one cares about this distintion yet.
Constant,
Load,
LoadFromPrototype
};
GetByOffsetMethod()
: m_kind(Invalid)
{
}
static GetByOffsetMethod constant(FrozenValue* value)
{
GetByOffsetMethod result;
result.m_kind = Constant;
result.u.constant = value;
return result;
}
static GetByOffsetMethod load(PropertyOffset offset)
{
GetByOffsetMethod result;
result.m_kind = Load;
result.u.load.offset = offset;
return result;
}
static GetByOffsetMethod loadFromPrototype(FrozenValue* prototype, PropertyOffset offset)
{
GetByOffsetMethod result;
result.m_kind = LoadFromPrototype;
result.u.load.prototype = prototype;
result.u.load.offset = offset;
return result;
}
bool operator!() const { return m_kind == Invalid; }
Kind kind() const { return m_kind; }
FrozenValue* constant() const
{
ASSERT(kind() == Constant);
return u.constant;
}
FrozenValue* prototype() const
{
ASSERT(kind() == LoadFromPrototype);
return u.load.prototype;
}
PropertyOffset offset() const
{
ASSERT(kind() == Load || kind() == LoadFromPrototype);
return u.load.offset;
}
void dumpInContext(PrintStream&, DumpContext*) const;
void dump(PrintStream&) const;
private:
union {
FrozenValue* constant;
struct {
FrozenValue* prototype;
PropertyOffset offset;
} load;
} u;
Kind m_kind;
};
class MultiGetByOffsetCase {
public:
MultiGetByOffsetCase()
{
}
MultiGetByOffsetCase(const RegisteredStructureSet& set, const GetByOffsetMethod& method)
: m_set(set)
, m_method(method)
{
}
RegisteredStructureSet& set() { return m_set; }
const RegisteredStructureSet& set() const { return m_set; }
const GetByOffsetMethod& method() const { return m_method; }
void dumpInContext(PrintStream&, DumpContext*) const;
void dump(PrintStream&) const;
private:
RegisteredStructureSet m_set;
GetByOffsetMethod m_method;
};
struct MultiGetByOffsetData {
unsigned identifierNumber;
Vector<MultiGetByOffsetCase, 2> cases;
};
} } // namespace JSC::DFG
namespace WTF {
void printInternal(PrintStream&, JSC::DFG::GetByOffsetMethod::Kind);
} // namespace WTF
#endif // ENABLE(DFG_JIT)
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