/*
 * Copyright (c) 2017, 2021, Oracle and/or its affiliates.
 * Copyright (c) 2013, Regents of the University of California
 *
 * 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE
 * COPYRIGHT HOLDER 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
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package com.oracle.graal.python.nodes.generator;

import com.oracle.graal.python.nodes.control.BaseBlockNode;
import com.oracle.graal.python.nodes.statement.StatementNode;
import com.oracle.graal.python.parser.GeneratorInfo;
import com.oracle.graal.python.runtime.exception.YieldException;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.ExplodeLoop;
import com.oracle.truffle.api.profiles.BranchProfile;
import com.oracle.truffle.api.profiles.ConditionProfile;

public final class GeneratorBlockNode extends BaseBlockNode implements GeneratorControlNode {

    @Child private GeneratorAccessNode gen = GeneratorAccessNode.create();

    private final ConditionProfile needsUpdateProfile = ConditionProfile.createBinaryProfile();
    private final BranchProfile seenYield = BranchProfile.create();
    private final int indexSlot;

    public GeneratorBlockNode(StatementNode[] statements, int indexSlot) {
        super(statements);
        this.indexSlot = indexSlot;
    }

    public GeneratorBlockNode(StatementNode[] statements, GeneratorInfo.Mutable generatorInfo) {
        this(statements, generatorInfo.nextBlockNodeIndex());
    }

    public static GeneratorBlockNode create(StatementNode[] statements, int indexSlot) {
        return new GeneratorBlockNode(statements, indexSlot);
    }

    public static GeneratorBlockNode create(StatementNode[] statements, GeneratorInfo.Mutable generatorInfo) {
        return new GeneratorBlockNode(statements, generatorInfo);
    }

    public int getIndexSlot() {
        return indexSlot;
    }

    @ExplodeLoop
    @Override
    public void executeVoid(VirtualFrame frame) {
        int startIndex = gen.getIndex(frame, indexSlot);
        int i = 0;
        int nextIndex = 0;
        try {
            for (i = 0; i < statements.length; i++) {
                if (i >= startIndex) {
                    statements[i].executeVoid(frame);
                }
            }
        } catch (YieldException e) {
            seenYield.enter();
            nextIndex = i;
            throw e;
        } finally {
            if (needsUpdateProfile.profile(nextIndex != startIndex)) {
                gen.setIndex(frame, indexSlot, nextIndex);
            }
        }
    }
}
