Source/JavaScriptCore/runtime/JSArrayBufferPrototypeInlines.h

/*
 * Copyright (C) 2020 Sony Interactive Entertainment Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * 1. Redistributions of source code must retain the above copyright
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 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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#pragma once

#include "JSArrayBufferPrototype.h"
#include "JSGlobalObject.h"

namespace JSC  {

namespace JSArrayBufferPrototypeInternal {
static constexpr bool verbose = false;
};

ALWAYS_INLINE bool speciesWatchpointIsValid(VM& vm, JSObject* thisObject, ArrayBufferSharingMode mode)
{
    JSGlobalObject* globalObject = thisObject->globalObject(vm);
    auto* prototype = globalObject->arrayBufferPrototype(mode);

    if (globalObject->arrayBufferSpeciesWatchpointSet(mode).stateOnJSThread() == ClearWatchpoint) {
        dataLogLnIf(JSArrayBufferPrototypeInternal::verbose, "Initializing ArrayBuffer species watchpoints for ArrayBuffer.prototype: ", pointerDump(prototype), " with structure: ", pointerDump(prototype->structure(vm)), "\nand ArrayBuffer: ", pointerDump(globalObject->arrayBufferConstructor(mode)), " with structure: ", pointerDump(globalObject->arrayBufferConstructor(mode)->structure(vm)));
        globalObject->tryInstallArrayBufferSpeciesWatchpoint(mode);
        ASSERT(globalObject->arrayBufferSpeciesWatchpointSet(mode).stateOnJSThread() != ClearWatchpoint);
    }

    return !thisObject->hasCustomProperties(vm)
        && prototype == thisObject->getPrototypeDirect(vm)
        && globalObject->arrayBufferSpeciesWatchpointSet(mode).stateOnJSThread() == IsWatched;
}

ALWAYS_INLINE std::optional<JSValue> arrayBufferSpeciesConstructor(JSGlobalObject* globalObject, JSArrayBuffer* thisObject, ArrayBufferSharingMode mode)
{
    VM& vm = globalObject->vm();
    auto scope = DECLARE_THROW_SCOPE(vm);

    bool isValid = speciesWatchpointIsValid(vm, thisObject, mode);
    scope.assertNoException();
    if (LIKELY(isValid))
        return std::nullopt;

    RELEASE_AND_RETURN(scope, arrayBufferSpeciesConstructorSlow(globalObject, thisObject, mode));
}

} // namespace JSC