Source/JavaScriptCore/wasm/WasmOMGForOSREntryPlan.cpp

/*
 * Copyright (C) 2019-2020 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.
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#include "config.h"
#include "WasmOMGForOSREntryPlan.h"

#if ENABLE(WEBASSEMBLY)

#include "B3Compilation.h"
#include "B3OpaqueByproducts.h"
#include "JSCInlines.h"
#include "LinkBuffer.h"
#include "WasmB3IRGenerator.h"
#include "WasmCallee.h"
#include "WasmContext.h"
#include "WasmInstance.h"
#include "WasmMachineThreads.h"
#include "WasmMemory.h"
#include "WasmNameSection.h"
#include "WasmSignatureInlines.h"
#include "WasmWorklist.h"
#include <wtf/DataLog.h>
#include <wtf/Locker.h>
#include <wtf/MonotonicTime.h>
#include <wtf/StdLibExtras.h>
#include <wtf/ThreadMessage.h>

namespace JSC { namespace Wasm {

namespace WasmOMGForOSREntryPlanInternal {
static constexpr bool verbose = false;
}

OMGForOSREntryPlan::OMGForOSREntryPlan(Context* context, Ref<Module>&& module, Ref<Callee>&& callee, uint32_t functionIndex, uint32_t loopIndex, MemoryMode mode, CompletionTask&& task)
    : Base(context, makeRef(const_cast<ModuleInformation&>(module->moduleInformation())), WTFMove(task))
    , m_module(WTFMove(module))
    , m_codeBlock(*m_module->codeBlockFor(mode))
    , m_callee(WTFMove(callee))
    , m_functionIndex(functionIndex)
    , m_loopIndex(loopIndex)
{
    ASSERT(Options::useOMGJIT());
    setMode(mode);
    ASSERT(m_codeBlock->runnable());
    ASSERT(m_codeBlock.ptr() == m_module->codeBlockFor(m_mode));
    dataLogLnIf(WasmOMGForOSREntryPlanInternal::verbose, "Starting OMGForOSREntry plan for ", functionIndex, " of module: ", RawPointer(&m_module.get()));
}

void OMGForOSREntryPlan::work(CompilationEffort)
{
    ASSERT(m_codeBlock->runnable());
    ASSERT(m_codeBlock.ptr() == m_module->codeBlockFor(mode()));
    const FunctionData& function = m_moduleInformation->functions[m_functionIndex];

    const uint32_t functionIndexSpace = m_functionIndex + m_module->moduleInformation().importFunctionCount();
    ASSERT(functionIndexSpace < m_module->moduleInformation().functionIndexSpaceSize());

    SignatureIndex signatureIndex = m_moduleInformation->internalFunctionSignatureIndices[m_functionIndex];
    const Signature& signature = SignatureInformation::get(signatureIndex);

    Vector<UnlinkedWasmToWasmCall> unlinkedCalls;
    CompilationContext context;
    unsigned osrEntryScratchBufferSize = 0;
    auto parseAndCompileResult = parseAndCompile(context, function, signature, unlinkedCalls, osrEntryScratchBufferSize, m_moduleInformation.get(), m_mode, CompilationMode::OMGForOSREntryMode, m_functionIndex, m_loopIndex);

    if (UNLIKELY(!parseAndCompileResult)) {
        fail(holdLock(m_lock), makeString(parseAndCompileResult.error(), "when trying to tier up ", String::number(m_functionIndex)));
        return;
    }

    Entrypoint omgEntrypoint;
    LinkBuffer linkBuffer(*context.wasmEntrypointJIT, nullptr, JITCompilationCanFail);
    if (UNLIKELY(linkBuffer.didFailToAllocate())) {
        Base::fail(holdLock(m_lock), makeString("Out of executable memory while tiering up function at index ", String::number(m_functionIndex)));
        return;
    }

    omgEntrypoint.compilation = makeUnique<B3::Compilation>(
        FINALIZE_WASM_CODE_FOR_MODE(CompilationMode::OMGForOSREntryMode, linkBuffer, B3CompilationPtrTag, "WebAssembly OMGForOSREntry function[%i] %s name %s", m_functionIndex, signature.toString().ascii().data(), makeString(IndexOrName(functionIndexSpace, m_moduleInformation->nameSection->get(functionIndexSpace))).ascii().data()),
        WTFMove(context.wasmEntrypointByproducts));

    omgEntrypoint.calleeSaveRegisters = WTFMove(parseAndCompileResult.value()->entrypoint.calleeSaveRegisters);

    MacroAssemblerCodePtr<WasmEntryPtrTag> entrypoint;
    ASSERT(m_codeBlock.ptr() == m_module->codeBlockFor(mode()));
    Ref<OMGForOSREntryCallee> callee = OMGForOSREntryCallee::create(WTFMove(omgEntrypoint), functionIndexSpace, m_moduleInformation->nameSection->get(functionIndexSpace), osrEntryScratchBufferSize, m_loopIndex, WTFMove(unlinkedCalls));
    {
        MacroAssembler::repatchPointer(parseAndCompileResult.value()->calleeMoveLocation, CalleeBits::boxWasm(callee.ptr()));
        entrypoint = callee->entrypoint();

        auto locker = holdLock(m_codeBlock->m_lock);
        for (auto& call : callee->wasmToWasmCallsites()) {
            MacroAssemblerCodePtr<WasmEntryPtrTag> entrypoint;
            if (call.functionIndexSpace < m_module->moduleInformation().importFunctionCount())
                entrypoint = m_codeBlock->m_wasmToWasmExitStubs[call.functionIndexSpace].code();
            else
                entrypoint = m_codeBlock->wasmEntrypointCalleeFromFunctionIndexSpace(call.functionIndexSpace).entrypoint().retagged<WasmEntryPtrTag>();

            MacroAssembler::repatchNearCall(call.callLocation, CodeLocationLabel<WasmEntryPtrTag>(entrypoint));
        }
    }
    resetInstructionCacheOnAllThreads();
    WTF::storeStoreFence();
    {
        auto locker = holdLock(m_codeBlock->m_lock);
        {
            switch (m_callee->compilationMode()) {
            case CompilationMode::LLIntMode: {
                LLIntCallee* llintCallee = static_cast<LLIntCallee*>(m_callee.ptr());
                auto locker = holdLock(llintCallee->tierUpCounter().m_lock);
                llintCallee->setOSREntryCallee(callee.copyRef());
                llintCallee->tierUpCounter().m_loopCompilationStatus = LLIntTierUpCounter::CompilationStatus::Compiled;
                break;
            }
            case CompilationMode::BBQMode: {
                BBQCallee* bbqCallee = static_cast<BBQCallee*>(m_callee.ptr());
                auto locker = holdLock(bbqCallee->tierUpCount()->getLock());
                bbqCallee->setOSREntryCallee(callee.copyRef());
                bbqCallee->tierUpCount()->osrEntryTriggers()[m_loopIndex] = TierUpCount::TriggerReason::CompilationDone;
                bbqCallee->tierUpCount()->m_compilationStatusForOMGForOSREntry = TierUpCount::CompilationStatus::Compiled;
                break;
            }
            default:
                RELEASE_ASSERT_NOT_REACHED();
            }
        }
        WTF::storeStoreFence();
        // It is possible that a new OMG callee is added while we release m_codeBlock->lock.
        // Until we add OMGForOSREntry callee to BBQCallee's m_osrEntryCallee, this new OMG function linking does not happen for this OMGForOSREntry callee.
        // We re-link this OMGForOSREntry callee again not to miss that chance.
        for (auto& call : callee->wasmToWasmCallsites()) {
            MacroAssemblerCodePtr<WasmEntryPtrTag> entrypoint;
            if (call.functionIndexSpace < m_module->moduleInformation().importFunctionCount())
                entrypoint = m_codeBlock->m_wasmToWasmExitStubs[call.functionIndexSpace].code();
            else
                entrypoint = m_codeBlock->wasmEntrypointCalleeFromFunctionIndexSpace(call.functionIndexSpace).entrypoint().retagged<WasmEntryPtrTag>();

            MacroAssembler::repatchNearCall(call.callLocation, CodeLocationLabel<WasmEntryPtrTag>(entrypoint));
        }
    }
    dataLogLnIf(WasmOMGForOSREntryPlanInternal::verbose, "Finished OMGForOSREntry ", m_functionIndex);
    complete(holdLock(m_lock));
}

} } // namespace JSC::Wasm

#endif // ENABLE(WEBASSEMBLY)