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/*
* Copyright (C) 2012 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 MethodOfGettingAValueProfile_h
#define MethodOfGettingAValueProfile_h
#include <wtf/Platform.h>
// This is guarded by ENABLE_DFG_JIT only because it uses some value profiles
// that are currently only used if the DFG is enabled (i.e. they are not
// available in the profile-only configuration). Hopefully someday all of
// these #if's will disappear...
#if ENABLE(DFG_JIT)
#include "JSValue.h"
namespace JSC {
class CodeBlock;
class LazyOperandValueProfileKey;
struct ValueProfile;
class MethodOfGettingAValueProfile {
public:
MethodOfGettingAValueProfile()
: m_kind(None)
{
}
explicit MethodOfGettingAValueProfile(ValueProfile* profile)
{
if (profile) {
m_kind = Ready;
u.profile = profile;
} else
m_kind = None;
}
static MethodOfGettingAValueProfile fromLazyOperand(
CodeBlock*, const LazyOperandValueProfileKey&);
bool operator!() const { return m_kind == None; }
// This logically has a pointer to a "There exists X such that
// ValueProfileBase<X>". But since C++ does not have existential
// templates, I cannot return it. So instead, for any methods that
// users of this class would like to call, we'll just have to provide
// a method here that does it through an indirection. Or we could
// possibly just make ValueProfile less template-based. But last I
// tried that, it felt more yucky than this class.
EncodedJSValue* getSpecFailBucket(unsigned index) const;
private:
enum Kind {
None,
Ready,
LazyOperand
};
Kind m_kind;
union {
ValueProfile* profile;
struct {
CodeBlock* codeBlock;
unsigned bytecodeOffset;
int operand;
} lazyOperand;
} u;
};
} // namespace JSC
#endif // ENABLE(DFG_JIT)
#endif // MethodOfGettingAValueProfile_h