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/*
* Copyright (C) 2015-2023 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(FTL_JIT)
#include "CCallHelpers.h"
#include "CodeBlock.h"
#include "CodeLocation.h"
#include "GPRInfo.h"
#include "MacroAssemblerCodeRef.h"
#include "RegisterSet.h"
#include "ScratchRegisterAllocator.h"
#include <wtf/SharedTask.h>
#include <wtf/TZoneMalloc.h>
namespace JSC { namespace FTL {
// A LazySlowPath is an object that represents a piece of code that is part of FTL generated code
// that will be generated lazily. It holds all of the important information needed to generate that
// code, such as where to link jumps to and which registers are in use. It also has a reference to a
// SharedTask that will do the actual code generation. That SharedTask may have additional data, like
// which registers hold the inputs or outputs.
class LazySlowPath {
WTF_MAKE_NONCOPYABLE(LazySlowPath);
WTF_MAKE_TZONE_ALLOCATED(LazySlowPath);
public:
struct GenerationParams {
// Extra parameters to the GeneratorFunction are made into fields of this struct, so that if
// we add new parameters, we don't have to change all of the users.
CCallHelpers::JumpList doneJumps;
CCallHelpers::JumpList* exceptionJumps;
LazySlowPath* lazySlowPath;
};
typedef void GeneratorFunction(CCallHelpers&, GenerationParams&);
typedef SharedTask<GeneratorFunction> Generator;
template<typename Functor>
static Ref<Generator> createGenerator(const Functor& functor)
{
return createSharedTask<GeneratorFunction>(functor);
}
LazySlowPath() = default;
~LazySlowPath();
void initialize(
CodeLocationJump<JSInternalPtrTag> patchableJump, CodeLocationLabel<JSInternalPtrTag> done,
CodeLocationLabel<ExceptionHandlerPtrTag> exceptionTarget, const RegisterSetBuilder& usedRegisters,
CallSiteIndex, RefPtr<Generator>
);
CodeLocationJump<JSInternalPtrTag> patchableJump() const { return m_patchableJump; }
CodeLocationLabel<JSInternalPtrTag> done() const { return m_done; }
const ScalarRegisterSet& usedRegisters() const { return m_usedRegisters; }
CallSiteIndex callSiteIndex() const { return m_callSiteIndex; }
void generate(CodeBlock*);
MacroAssemblerCodeRef<JITStubRoutinePtrTag> stub() const { return m_stub; }
private:
CodeLocationJump<JSInternalPtrTag> m_patchableJump;
CodeLocationLabel<JSInternalPtrTag> m_done;
CodeLocationLabel<ExceptionHandlerPtrTag> m_exceptionTarget;
ScalarRegisterSet m_usedRegisters;
CallSiteIndex m_callSiteIndex;
MacroAssemblerCodeRef<JITStubRoutinePtrTag> m_stub;
RefPtr<Generator> m_generator;
};
} } // namespace JSC::FTL
#endif // ENABLE(FTL_JIT)
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