/*
 * Copyright (C) 2011-2021 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. 
 */

#include "config.h"
#include "DFGDriver.h"

#include "CodeBlock.h"
#include "DFGJITCode.h"
#include "DFGPlan.h"
#include "DFGThunks.h"
#include "FunctionAllowlist.h"
#include "JITCode.h"
#include "JITWorklist.h"
#include "Options.h"
#include "ThunkGenerators.h"
#include "TypeProfilerLog.h"
#include <wtf/NeverDestroyed.h>

namespace JSC { namespace DFG {

static unsigned numCompilations;

unsigned getNumCompilations()
{
    return numCompilations;
}

#if ENABLE(DFG_JIT)
static FunctionAllowlist& ensureGlobalDFGAllowlist()
{
    static LazyNeverDestroyed<FunctionAllowlist> dfgAllowlist;
    static std::once_flag initializeAllowlistFlag;
    std::call_once(initializeAllowlistFlag, [] {
        const char* functionAllowlistFile = Options::dfgAllowlist();
        dfgAllowlist.construct(functionAllowlistFile);
    });
    return dfgAllowlist;
}

static CompilationResult compileImpl(
    VM& vm, CodeBlock* codeBlock, CodeBlock* profiledDFGCodeBlock, JITCompilationMode mode,
    BytecodeIndex osrEntryBytecodeIndex, const Operands<std::optional<JSValue>>& mustHandleValues,
    Ref<DeferredCompilationCallback>&& callback)
{
    if (!Options::bytecodeRangeToDFGCompile().isInRange(codeBlock->instructionsSize())
        || !ensureGlobalDFGAllowlist().contains(codeBlock))
        return CompilationFailed;
    
    numCompilations++;
    
    ASSERT(codeBlock);
    ASSERT(codeBlock->alternative());
    ASSERT(JITCode::isBaselineCode(codeBlock->alternative()->jitType()));
    ASSERT(!profiledDFGCodeBlock || profiledDFGCodeBlock->jitType() == JITType::DFGJIT);
    
    if (logCompilationChanges(mode))
        dataLog("DFG(Driver) compiling ", *codeBlock, " with ", mode, ", instructions size = ", codeBlock->instructionsSize(), "\n");
    
    if (vm.typeProfiler())
        vm.typeProfilerLog()->processLogEntries(vm, "Preparing for DFG compilation."_s);
    
    Ref<Plan> plan = adoptRef(
        *new Plan(codeBlock, profiledDFGCodeBlock, mode, osrEntryBytecodeIndex, mustHandleValues));

    plan->setCallback(WTFMove(callback));
    JITWorklist& worklist = JITWorklist::ensureGlobalWorklist();
    dataLogLnIf(Options::useConcurrentJIT() && logCompilationChanges(mode), "Deferring DFG compilation of ", *codeBlock, " with queue length ", worklist.queueLength(), ".\n");
    return worklist.enqueue(WTFMove(plan));
}
#else // ENABLE(DFG_JIT)
static CompilationResult compileImpl(
    VM&, CodeBlock*, CodeBlock*, JITCompilationMode, BytecodeIndex, const Operands<std::optional<JSValue>>&,
    Ref<DeferredCompilationCallback>&&)
{
    return CompilationFailed;
}
#endif // ENABLE(DFG_JIT)

CompilationResult compile(
    VM& vm, CodeBlock* codeBlock, CodeBlock* profiledDFGCodeBlock, JITCompilationMode mode,
    BytecodeIndex osrEntryBytecodeIndex, const Operands<std::optional<JSValue>>& mustHandleValues,
    Ref<DeferredCompilationCallback>&& callback)
{
    CompilationResult result = compileImpl(
        vm, codeBlock, profiledDFGCodeBlock, mode, osrEntryBytecodeIndex, mustHandleValues,
        callback.copyRef());
    return result;
}

} } // namespace JSC::DFG