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CachedRecovery.h
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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(JIT)
#
include
"
ValueRecovery.h
"
#
include
"
VirtualRegister.h
"
#
include
<
wtf/Vector.h
>
namespace
JSC
{
//
A CachedRecovery is a wrapper around a ValueRecovery that records where said
//
value should go on the stack and/or in registers. Whenever we perform an
//
operation changing the ValueRecovery, we update the CachedRecovery's member
//
in place.
class
CachedRecovery
{
public:
CachedRecovery
(ValueRecovery recovery)
: m_recovery { recovery }
{
}
CachedRecovery
(CachedRecovery&) =
delete
;
CachedRecovery
(CachedRecovery&&) =
delete
;
CachedRecovery&
operator
=(CachedRecovery&) =
delete
;
CachedRecovery&
operator
=(CachedRecovery&&) =
delete
;
const
Vector<VirtualRegister,
1
>&
targets
()
const
LIFETIME_BOUND {
return
m_targets; }
void
addTarget
(VirtualRegister reg)
{
ASSERT
(m_targets.
isEmpty
() || m_targets.
last
() < reg);
m_targets.
append
(reg);
}
void
removeTarget
(VirtualRegister reg)
{
ASSERT_UNUSED
(reg, m_targets.
last
() == reg);
m_targets.
shrink
(m_targets.
size
() -
1
);
}
void
clearTargets
()
{
m_targets.
clear
();
}
void
setWantedJSValueRegs
(JSValueRegs jsValueRegs)
{
ASSERT
(m_wantedFPR == InvalidFPRReg);
m_wantedJSValueRegs = jsValueRegs;
}
void
setWantedFPR
(FPRReg fpr)
{
ASSERT
(!m_wantedJSValueRegs);
m_wantedFPR = fpr;
}
//
Determine whether converting this recovery into a JSValue will
//
require additional GPRs and/or FPRs.
//
This is guaranteed to only depend on the DataFormat, and the
//
result of these calls will stay valid after loads and/or stores.
bool
boxingRequiresGPR
()
const
{
return
recovery
().
dataFormat
() == DataFormatDouble;
}
bool
boxingRequiresFPR
()
const
{
switch
(
recovery
().
dataFormat
()) {
case
DataFormatInt52:
case
DataFormatStrictInt52:
return
true
;
default
:
return
false
;
}
}
//
This is used to determine what kind of register we need to be
//
able to load a recovery. We only use it when a direct load is
//
currently impossible, to determine whether we should spill a
//
GPR or an FPR for loading this value.
bool
NODELETE
loadsIntoGPR
()
const
;
bool
NODELETE
loadsIntoFPR
()
const
;
ValueRecovery
recovery
()
const
{
return
m_recovery; }
void
setRecovery
(ValueRecovery recovery) { m_recovery = recovery; }
JSValueRegs
wantedJSValueRegs
()
const
{
return
m_wantedJSValueRegs; }
FPRReg
wantedFPR
()
const
{
return
m_wantedFPR; }
private:
Vector<VirtualRegister,
1
> m_targets;
ValueRecovery m_recovery;
JSValueRegs m_wantedJSValueRegs;
FPRReg m_wantedFPR { InvalidFPRReg };
};
}
//
namespace JSC
#
endif
//
ENABLE(JIT)
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