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https://github.com/darlinghq/darling-JavaScriptCore.git
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80 lines
3.4 KiB
C++
80 lines
3.4 KiB
C++
/*
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* Copyright (C) 2015-2016 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#if ENABLE(B3_JIT)
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#include "B3Effects.h"
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#include "B3StackmapValue.h"
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#include "B3Value.h"
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namespace JSC { namespace B3 {
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class PatchpointValue final : public StackmapValue {
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public:
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typedef StackmapValue Base;
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static bool accepts(Kind kind) { return kind == Patchpoint; }
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~PatchpointValue() final;
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// The effects of the patchpoint. This defaults to Effects::forCall(), but you can set it to anything.
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//
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// If there are no effects, B3 is free to assume any use of this PatchpointValue can be replaced with
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// a use of a different PatchpointValue, so long as the other one also has no effects and has the
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// same children. Note that this comparison ignores child constraints, the result constraint, and all
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// other StackmapValue meta-data. If there are read effects but not write effects, then this same sort
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// of substitution could be made so long as there are no interfering writes.
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Effects effects;
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// The input representation (i.e. constraint) of the return value. This defaults to WarmAny if the
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// type is Void and it defaults to SomeRegister otherwise. It's illegal to mess with this if the type
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// is Void. Otherwise you can set this to any input constraint. If the type of the patchpoint is a tuple
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// the constrants must be set explicitly.
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Vector<ValueRep, 1> resultConstraints;
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// The number of scratch registers that this patchpoint gets. The scratch register is guaranteed
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// to be different from any input register and the destination register. It's also guaranteed not
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// to be clobbered either early or late. These are 0 by default.
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uint8_t numGPScratchRegisters { 0 };
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uint8_t numFPScratchRegisters { 0 };
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B3_SPECIALIZE_VALUE_FOR_FINAL_SIZE_VARARGS_CHILDREN
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private:
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void dumpMeta(CommaPrinter&, PrintStream&) const final;
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friend class Procedure;
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friend class Value;
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static Opcode opcodeFromConstructor(Type, Origin) { return Patchpoint; }
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JS_EXPORT_PRIVATE PatchpointValue(Type, Origin);
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};
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} } // namespace JSC::B3
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#endif // ENABLE(B3_JIT)
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