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 * Copyright (c) 2017, 2021, Oracle and/or its affiliates.
 * Copyright (c) 2013, Regents of the University of California
 *
 * All rights reserved.
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 * 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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 * 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
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 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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package com.oracle.graal.python.nodes.function;

import com.oracle.graal.python.builtins.objects.cell.PCell;
import com.oracle.graal.python.builtins.objects.function.PArguments;
import com.oracle.graal.python.nodes.expression.ExpressionNode;
import com.oracle.graal.python.parser.DefinitionCellSlots;
import com.oracle.graal.python.parser.ExecutionCellSlots;
import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.frame.Frame;
import com.oracle.truffle.api.nodes.ExplodeLoop;
import com.oracle.truffle.api.profiles.ConditionProfile;
import com.oracle.truffle.api.profiles.ValueProfile;

@SuppressWarnings("deprecation")    // new Frame API
abstract class ExpressionDefinitionNode extends ExpressionNode {
    private final ValueProfile frameProfile = ValueProfile.createClassProfile();
    private final ConditionProfile isGeneratorProfile = ConditionProfile.createBinaryProfile();

    final ExecutionCellSlots executionCellSlots;
    @CompilerDirectives.CompilationFinal(dimensions = 1) private final com.oracle.truffle.api.frame.FrameSlot[] freeVarDefinitionSlots;

    ExpressionDefinitionNode(DefinitionCellSlots definitionCellSlots, ExecutionCellSlots executionCellSlots) {
        this.executionCellSlots = executionCellSlots;
        this.freeVarDefinitionSlots = definitionCellSlots.getFreeVarSlots();
    }

    @ExplodeLoop
    PCell[] getClosureFromLocals(Frame frame) {
        if (freeVarDefinitionSlots.length == 0) {
            return null;
        }

        PCell[] closure = new PCell[freeVarDefinitionSlots.length];

        for (int i = 0; i < freeVarDefinitionSlots.length; i++) {
            com.oracle.truffle.api.frame.FrameSlot defFrameSlot = freeVarDefinitionSlots[i];
            Object cell = com.oracle.truffle.api.frame.FrameUtil.getObjectSafe(frame, defFrameSlot);
            assert cell instanceof PCell : "getting closure from locals: expected a cell";
            closure[i] = (PCell) cell;
        }

        return closure;
    }

    PCell[] getClosureFromGeneratorOrFunctionLocals(Frame frame) {
        PCell[] closure;
        Frame generatorFrame = PArguments.getGeneratorFrame(frame);
        if (isGeneratorProfile.profile(generatorFrame != null)) {
            closure = getClosureFromLocals(frameProfile.profile(generatorFrame));
        } else {
            closure = getClosureFromLocals(frame);
        }
        return closure;
    }

    public ExecutionCellSlots getExecutionCellSlots() {
        return executionCellSlots;
    }

    public com.oracle.truffle.api.frame.FrameSlot[] getFreeVarDefinitionSlots() {
        return freeVarDefinitionSlots;
    }

}
