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/*
* Copyright (C) 2016-2019 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(WEBASSEMBLY)
#include "ArityCheckMode.h"
#include "JSToWasmICCallee.h"
#include "MacroAssemblerCodeRef.h"
#include "WasmCallee.h"
#include "WebAssemblyFunctionBase.h"
#include <wtf/Noncopyable.h>
namespace JSC {
class JSGlobalObject;
struct ProtoCallFrame;
class WebAssemblyInstance;
using Wasm::WasmToWasmImportableFunction;
namespace B3 {
class Compilation;
}
class WebAssemblyFunction final : public WebAssemblyFunctionBase {
public:
using Base = WebAssemblyFunctionBase;
const static unsigned StructureFlags = Base::StructureFlags;
static constexpr bool needsDestruction = true;
static void destroy(JSCell*);
template<typename CellType, SubspaceAccess mode>
static IsoSubspace* subspaceFor(VM& vm)
{
return vm.webAssemblyFunctionSpace<mode>();
}
DECLARE_EXPORT_INFO;
JS_EXPORT_PRIVATE static WebAssemblyFunction* create(VM&, JSGlobalObject*, Structure*, unsigned, const String&, JSWebAssemblyInstance*, Wasm::Callee& jsEntrypoint, WasmToWasmImportableFunction::LoadLocation, Wasm::SignatureIndex);
static Structure* createStructure(VM&, JSGlobalObject*, JSValue);
Wasm::SignatureIndex signatureIndex() const { return m_importableFunction.signatureIndex; }
WasmToWasmImportableFunction::LoadLocation entrypointLoadLocation() const { return m_importableFunction.entrypointLoadLocation; }
WasmToWasmImportableFunction importableFunction() const { return m_importableFunction; }
MacroAssemblerCodePtr<WasmEntryPtrTag> jsEntrypoint(ArityCheckMode arity)
{
if (arity == ArityCheckNotRequired)
return m_jsEntrypoint;
ASSERT(arity == MustCheckArity);
return m_jsEntrypoint;
}
static ptrdiff_t offsetOfEntrypointLoadLocation() { return OBJECT_OFFSETOF(WebAssemblyFunction, m_importableFunction) + WasmToWasmImportableFunction::offsetOfEntrypointLoadLocation(); }
MacroAssemblerCodePtr<JSEntryPtrTag> jsCallEntrypoint()
{
if (m_jsCallEntrypoint)
return m_jsCallEntrypoint.code();
return jsCallEntrypointSlow();
}
RegisterAtOffsetList usedCalleeSaveRegisters() const;
Wasm::Instance* previousInstance(CallFrame*);
private:
static void visitChildren(JSCell*, SlotVisitor&);
WebAssemblyFunction(VM&, JSGlobalObject*, Structure*, Wasm::Callee& jsEntrypoint, WasmToWasmImportableFunction::LoadLocation entrypointLoadLocation, Wasm::SignatureIndex);
MacroAssemblerCodePtr<JSEntryPtrTag> jsCallEntrypointSlow();
ptrdiff_t previousInstanceOffset() const;
bool useTagRegisters() const;
RegisterSet calleeSaves() const;
// It's safe to just hold the raw WasmToWasmImportableFunction/jsEntrypoint because we have a reference
// to our Instance, which points to the Module that exported us, which
// ensures that the actual Signature/code doesn't get deallocated.
MacroAssemblerCodePtr<WasmEntryPtrTag> m_jsEntrypoint;
WasmToWasmImportableFunction m_importableFunction;
WriteBarrier<JSToWasmICCallee> m_jsToWasmICCallee;
// Used for JS calling into Wasm.
MacroAssemblerCodeRef<JSEntryPtrTag> m_jsCallEntrypoint;
};
} // namespace JSC
#endif // ENABLE(WEBASSEMBLY)