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/*
* Copyright (C) 2015-2016 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 B3PatchpointValue_h
#define B3PatchpointValue_h
#if ENABLE(B3_JIT)
#include "B3Effects.h"
#include "B3StackmapValue.h"
#include "B3Value.h"
namespace JSC { namespace B3 {
class PatchpointValue : public StackmapValue {
public:
typedef StackmapValue Base;
static bool accepts(Opcode opcode) { return opcode == Patchpoint; }
~PatchpointValue();
// The effects of the patchpoint. This defaults to Effects::forCall(), but you can set it to anything.
//
// If there are no effects, B3 is free to assume any use of this PatchpointValue can be replaced with
// a use of a different PatchpointValue, so long as the other one also has no effects and has the
// same children. Note that this comparison ignores child constraints, the result constraint, and all
// other StackmapValue meta-data. If there are read effects but not write effects, then this same sort
// of substitution could be made so long as there are no interfering writes.
Effects effects;
// The input representation (i.e. constraint) of the return value. This defaults to WarmAny if the
// type is Void and it defaults to SomeRegister otherwise. It's illegal to mess with this if the type
// is Void. Otherwise you can set this to any input constraint.
ValueRep resultConstraint;
// The number of scratch registers that this patchpoint gets. The scratch register is guaranteed
// to be different from any input register and the destination register. It's also guaranteed not
// to be clobbered either early or late. These are 0 by default.
uint8_t numGPScratchRegisters { 0 };
uint8_t numFPScratchRegisters { 0 };
protected:
void dumpMeta(CommaPrinter&, PrintStream&) const override;
Value* cloneImpl() const override;
private:
friend class Procedure;
JS_EXPORT_PRIVATE PatchpointValue(Type, Origin);
};
} } // namespace JSC::B3
#endif // ENABLE(B3_JIT)
#endif // B3PatchpointValue_h
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