Source/JavaScriptCore/bytecode/AccessCaseSnippetParams.cpp

/*
 * Copyright (C) 2016-2018 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *    notice, this list of conditions and the following disclaimer in the
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 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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#include "config.h"
#include "AccessCaseSnippetParams.h"

#include "LinkBuffer.h"
#include "PolymorphicAccess.h"
#include "StructureStubInfo.h"

#if ENABLE(JIT)

namespace JSC {

template<typename JumpType, typename FunctionType, typename ResultType, typename... Arguments>
class SlowPathCallGeneratorWithArguments : public AccessCaseSnippetParams::SlowPathCallGenerator {
public:
    SlowPathCallGeneratorWithArguments(JumpType from, CCallHelpers::Label to, FunctionType function, ResultType result, std::tuple<Arguments...> arguments)
        : m_from(from)
        , m_to(to)
        , m_function(function)
        , m_result(result)
        , m_arguments(arguments)
    {
    }

    template<size_t... ArgumentsIndex>
    CCallHelpers::JumpList generateImpl(AccessGenerationState& state, const RegisterSet& usedRegistersBySnippet, CCallHelpers& jit, std::index_sequence<ArgumentsIndex...>)
    {
        CCallHelpers::JumpList exceptions;
        // We spill (1) the used registers by IC and (2) the used registers by Snippet.
        AccessGenerationState::SpillState spillState = state.preserveLiveRegistersToStackForCall(usedRegistersBySnippet);

        jit.store32(
            CCallHelpers::TrustedImm32(state.callSiteIndexForExceptionHandlingOrOriginal().bits()),
            CCallHelpers::tagFor(CallFrameSlot::argumentCountIncludingThis));

        jit.makeSpaceOnStackForCCall();

        jit.setupArguments<FunctionType>(std::get<ArgumentsIndex>(m_arguments)...);
        jit.prepareCallOperation(state.m_vm);

        CCallHelpers::Call operationCall = jit.call(OperationPtrTag);
        auto function = m_function;
        jit.addLinkTask([=] (LinkBuffer& linkBuffer) {
            linkBuffer.link(operationCall, FunctionPtr<OperationPtrTag>(function));
        });

        jit.setupResults(m_result);
        jit.reclaimSpaceOnStackForCCall();

        CCallHelpers::Jump noException = jit.emitExceptionCheck(state.m_vm, CCallHelpers::InvertedExceptionCheck);

        state.restoreLiveRegistersFromStackForCallWithThrownException(spillState);
        exceptions.append(jit.jump());

        noException.link(&jit);
        RegisterSet dontRestore;
        dontRestore.set(m_result);
        state.restoreLiveRegistersFromStackForCall(spillState, dontRestore);

        return exceptions;
    }

    CCallHelpers::JumpList generate(AccessGenerationState& state, const RegisterSet& usedRegistersBySnippet, CCallHelpers& jit) override
    {
        m_from.link(&jit);
        CCallHelpers::JumpList exceptions = generateImpl(state, usedRegistersBySnippet, jit, std::make_index_sequence<std::tuple_size<std::tuple<Arguments...>>::value>());
        jit.jump().linkTo(m_to, &jit);
        return exceptions;
    }

protected:
    JumpType m_from;
    CCallHelpers::Label m_to;
    FunctionType m_function;
    ResultType m_result;
    std::tuple<Arguments...> m_arguments;
};

#define JSC_DEFINE_CALL_OPERATIONS(OperationType, ResultType, ...) \
    void AccessCaseSnippetParams::addSlowPathCallImpl(CCallHelpers::JumpList from, CCallHelpers& jit, OperationType operation, ResultType result, std::tuple<__VA_ARGS__> args) \
    { \
        CCallHelpers::Label to = jit.label(); \
        m_generators.append(makeUnique<SlowPathCallGeneratorWithArguments<CCallHelpers::JumpList, OperationType, ResultType, __VA_ARGS__>>(from, to, operation, result, args)); \
    } \

SNIPPET_SLOW_PATH_CALLS(JSC_DEFINE_CALL_OPERATIONS)
#undef JSC_DEFINE_CALL_OPERATIONS

CCallHelpers::JumpList AccessCaseSnippetParams::emitSlowPathCalls(AccessGenerationState& state, const RegisterSet& usedRegistersBySnippet, CCallHelpers& jit)
{
    CCallHelpers::JumpList exceptions;
    for (auto& generator : m_generators)
        exceptions.append(generator->generate(state, usedRegistersBySnippet, jit));
    return exceptions;
}

}

#endif