Source/JavaScriptCore/runtime/InitializeThreading.cpp

/*
 * Copyright (C) 2008-2019 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. 
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 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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#include "config.h"
#include "InitializeThreading.h"

#include "DisallowVMReentry.h"
#include "ExecutableAllocator.h"
#include "Heap.h"
#include "Identifier.h"
#include "JSCPtrTag.h"
#include "JSDateMath.h"
#include "JSGlobalObject.h"
#include "JSLock.h"
#include "LLIntData.h"
#include "MacroAssemblerCodeRef.h"
#include "Options.h"
#include "SigillCrashAnalyzer.h"
#include "StructureIDTable.h"
#include "SuperSampler.h"
#include "WasmCapabilities.h"
#include "WasmThunks.h"
#include "WriteBarrier.h"
#include <mutex>
#include <wtf/MainThread.h>
#include <wtf/Threading.h>
#include <wtf/dtoa.h>
#include <wtf/dtoa/cached-powers.h>

namespace JSC {

static_assert(sizeof(bool) == 1, "LLInt and JIT assume sizeof(bool) is always 1 when touching it directly from assembly code.");

void initializeThreading()
{
    static std::once_flag initializeThreadingOnceFlag;

    std::call_once(initializeThreadingOnceFlag, []{
        WTF::initializeThreading();
        Options::initialize();

        initializePtrTagLookup();

#if ENABLE(WRITE_BARRIER_PROFILING)
        WriteBarrierCounters::initialize();
#endif

        ExecutableAllocator::initialize();
        VM::computeCanUseJIT();

        if (VM::canUseJIT() && Options::useSigillCrashAnalyzer())
            enableSigillCrashAnalyzer();

        LLInt::initialize();
#ifndef NDEBUG
        DisallowGC::initialize();
        DisallowVMReentry::initialize();
#endif
        initializeSuperSampler();
        Thread& thread = Thread::current();
        thread.setSavedLastStackTop(thread.stack().origin());

#if ENABLE(WEBASSEMBLY)
        if (Wasm::isSupported())
            Wasm::Thunks::initialize();
#endif

        if (VM::isInMiniMode())
            WTF::fastEnableMiniMode();
    });
}

} // namespace JSC