AsyncIteratorFunctionBuiltins.java

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package com.oracle.truffle.js.builtins;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.profiles.BranchProfile;
import com.oracle.truffle.api.profiles.ConditionProfile;
import com.oracle.truffle.js.nodes.access.GetIteratorDirectNode;
import com.oracle.truffle.js.nodes.access.GetIteratorNode;
import com.oracle.truffle.js.nodes.access.GetMethodNode;
import com.oracle.truffle.js.nodes.binary.InstanceofNode.OrdinaryHasInstanceNode;
import com.oracle.truffle.js.nodes.function.JSBuiltin;
import com.oracle.truffle.js.nodes.function.JSBuiltinNode;
import com.oracle.truffle.js.nodes.unary.IsCallableNode;
import com.oracle.truffle.js.runtime.Errors;
import com.oracle.truffle.js.runtime.JSContext;
import com.oracle.truffle.js.runtime.Symbol;
import com.oracle.truffle.js.runtime.builtins.BuiltinEnum;
import com.oracle.truffle.js.runtime.builtins.JSAsyncIterator;
import com.oracle.truffle.js.runtime.builtins.JSWrapForAsyncIterator;
import com.oracle.truffle.js.runtime.objects.IteratorRecord;
import com.oracle.truffle.js.runtime.objects.JSDynamicObject;
import com.oracle.truffle.js.runtime.objects.Undefined;

public final class AsyncIteratorFunctionBuiltins extends JSBuiltinsContainer.SwitchEnum<AsyncIteratorFunctionBuiltins.AsyncIteratorFunction> {

    public static final JSBuiltinsContainer BUILTINS = new AsyncIteratorFunctionBuiltins();

    protected AsyncIteratorFunctionBuiltins() {
        super(JSAsyncIterator.CLASS_NAME, AsyncIteratorFunction.class);
    }

    public enum AsyncIteratorFunction implements BuiltinEnum<AsyncIteratorFunction> {
        from(1);

        private final int length;

        AsyncIteratorFunction(int length) {
            this.length = length;
        }

        @Override
        public int getLength() {
            return length;
        }
    }

    @Override
    protected Object createNode(JSContext context, JSBuiltin builtin, boolean construct, boolean newTarget, AsyncIteratorFunction builtinEnum) {
        switch (builtinEnum) {
            case from:
                return AsyncIteratorFunctionBuiltinsFactory.JSAsyncIteratorFromNodeGen.create(context, builtin, args().fixedArgs(1).createArgumentNodes(context));
        }

        return null;
    }

    public abstract static class JSAsyncIteratorFromNode extends JSBuiltinNode {
        @Child private GetMethodNode getAsyncIteratorMethodNode;
        @Child private GetMethodNode getIteratorMethodNode;
        @Child private GetIteratorNode getIteratorNode;

        @Child private OrdinaryHasInstanceNode ordinaryHasInstanceNode;
        @Child private GetIteratorDirectNode getIteratorDirectNode;
        @Child private IsCallableNode isCallableNode;

        private final ConditionProfile usingIteratorProfile = ConditionProfile.createBinaryProfile();
        private final BranchProfile errorProfile = BranchProfile.create();

        public JSAsyncIteratorFromNode(JSContext context, JSBuiltin builtin) {
            super(context, builtin);
            this.getAsyncIteratorMethodNode = GetMethodNode.create(context, Symbol.SYMBOL_ASYNC_ITERATOR);
            this.getIteratorMethodNode = GetMethodNode.create(context, Symbol.SYMBOL_ITERATOR);
        }

        @Specialization
        protected JSDynamicObject asyncIteratorFrom(Object arg) {
            IteratorRecord iteratorRecord = null;

            Object usingIterator = getAsyncIteratorMethodNode.executeWithTarget(arg);
            if (usingIteratorProfile.profile(usingIterator != Undefined.instance || getIteratorMethodNode.executeWithTarget(arg) != Undefined.instance)) {
                if (getIteratorNode == null) {
                    CompilerDirectives.transferToInterpreterAndInvalidate();
                    getIteratorNode = insert(GetIteratorNode.createAsync(getContext(), null));
                }

                iteratorRecord = getIteratorNode.execute(arg);

                if (isCallableNode == null) {
                    CompilerDirectives.transferToInterpreterAndInvalidate();
                    isCallableNode = insert(IsCallableNode.create());
                }

                if (!isCallableNode.executeBoolean(iteratorRecord.getNextMethod())) {
                    errorProfile.enter();
                    throw Errors.createTypeErrorCallableExpected();
                }

                if (ordinaryHasInstanceNode == null) {
                    CompilerDirectives.transferToInterpreterAndInvalidate();
                    ordinaryHasInstanceNode = insert(OrdinaryHasInstanceNode.create(getContext()));
                }

                boolean hasInstance = ordinaryHasInstanceNode.executeBoolean(iteratorRecord.getIterator(), getRealm().getAsyncIteratorConstructor());
                if (hasInstance) {
                    return iteratorRecord.getIterator();
                }
            } else {
                if (getIteratorDirectNode == null) {
                    CompilerDirectives.transferToInterpreterAndInvalidate();
                    getIteratorDirectNode = insert(GetIteratorDirectNode.create(getContext()));
                }

                iteratorRecord = getIteratorDirectNode.execute(arg);
            }

            return JSWrapForAsyncIterator.create(getContext(), getRealm(), iteratorRecord);
        }
    }
}