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/*
* Copyright (C) 2013 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 FTLExitValue_h
#define FTLExitValue_h
#include <wtf/Platform.h>
#if ENABLE(FTL_JIT)
#include "FTLExitArgument.h"
#include "JSCJSValue.h"
#include "VirtualRegister.h"
#include <wtf/PrintStream.h>
namespace JSC { namespace FTL {
// This is like ValueRecovery, but respects the way that the FTL does OSR
// exit: the live non-constant non-flushed values are passed as arguments
// to a noreturn tail call. ExitValue is hence mostly responsible for
// telling us the mapping between operands in bytecode and the arguments to
// the call.
enum ExitValueKind {
InvalidExitValue,
ExitValueDead,
ExitValueArgument,
ExitValueConstant,
ExitValueInJSStack,
ExitValueInJSStackAsInt32,
ExitValueInJSStackAsInt52,
ExitValueInJSStackAsDouble
};
class ExitValue {
public:
ExitValue()
: m_kind(InvalidExitValue)
{
}
bool operator!() const { return m_kind == InvalidExitValue; }
static ExitValue dead()
{
ExitValue result;
result.m_kind = ExitValueDead;
return result;
}
static ExitValue inJSStack(VirtualRegister reg)
{
ExitValue result;
result.m_kind = ExitValueInJSStack;
result.u.virtualRegister = reg.offset();
return result;
}
static ExitValue inJSStackAsInt32(VirtualRegister reg)
{
ExitValue result;
result.m_kind = ExitValueInJSStackAsInt32;
result.u.virtualRegister = reg.offset();
return result;
}
static ExitValue inJSStackAsInt52(VirtualRegister reg)
{
ExitValue result;
result.m_kind = ExitValueInJSStackAsInt52;
result.u.virtualRegister = reg.offset();
return result;
}
static ExitValue inJSStackAsDouble(VirtualRegister reg)
{
ExitValue result;
result.m_kind = ExitValueInJSStackAsDouble;
result.u.virtualRegister = reg.offset();
return result;
}
static ExitValue constant(JSValue value)
{
ExitValue result;
result.m_kind = ExitValueConstant;
result.u.constant = JSValue::encode(value);
return result;
}
static ExitValue exitArgument(const ExitArgument& argument)
{
ExitValue result;
result.m_kind = ExitValueArgument;
result.u.argument = argument.representation();
return result;
}
ExitValueKind kind() const { return m_kind; }
bool isDead() const { return kind() == ExitValueDead; }
bool isInJSStackSomehow() const
{
switch (kind()) {
case ExitValueInJSStack:
case ExitValueInJSStackAsInt32:
case ExitValueInJSStackAsInt52:
case ExitValueInJSStackAsDouble:
return true;
default:
return false;
}
}
bool isConstant() const { return kind() == ExitValueConstant; }
bool isArgument() const { return kind() == ExitValueArgument; }
ExitArgument exitArgument() const
{
ASSERT(isArgument());
return ExitArgument(u.argument);
}
JSValue constant() const
{
ASSERT(isConstant());
return JSValue::decode(u.constant);
}
VirtualRegister virtualRegister() const
{
ASSERT(isInJSStackSomehow());
return VirtualRegister(u.virtualRegister);
}
// If it's in the JSStack somehow, this will tell you what format it's in, in a manner
// that is compatible with exitArgument().format(). If it's a constant or it's dead, it
// will claim to be a JSValue. If it's an argument then it will tell you the argument's
// format.
ValueFormat valueFormat() const
{
switch (kind()) {
case InvalidExitValue:
RELEASE_ASSERT_NOT_REACHED();
return InvalidValueFormat;
case ExitValueDead:
case ExitValueConstant:
case ExitValueInJSStack:
return ValueFormatJSValue;
case ExitValueArgument:
return exitArgument().format();
case ExitValueInJSStackAsInt32:
return ValueFormatInt32;
case ExitValueInJSStackAsInt52:
return ValueFormatInt52;
case ExitValueInJSStackAsDouble:
return ValueFormatDouble;
}
RELEASE_ASSERT_NOT_REACHED();
return InvalidValueFormat;
}
void dump(PrintStream&) const;
void dumpInContext(PrintStream&, DumpContext*) const;
private:
ExitValueKind m_kind;
union {
ExitArgumentRepresentation argument;
EncodedJSValue constant;
int virtualRegister;
} u;
};
} } // namespace JSC::FTL
#endif // ENABLE(FTL_JIT)
#endif // FTLExitValue_h
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