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 * conditions and the following disclaimer in the documentation and/or other materials provided
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package com.oracle.truffle.llvm.runtime.nodes.api;

import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.frame.FrameSlot;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.ExplodeLoop;
import com.oracle.truffle.api.nodes.NodeCost;
import com.oracle.truffle.api.nodes.NodeInfo;
import com.oracle.truffle.llvm.runtime.nodes.base.LLVMFrameNullerUtil;

Nulls out the given set of frame slots after evaluating the given statement.
/**
 * Nulls out the given set of frame slots after evaluating the given statement.
 */
@NodeInfo(cost = NodeCost.NONE) // this node reduces the compiled code size
public abstract class LLVMFrameNuller extends LLVMStatementNode {

    @CompilationFinal(dimensions = 1) private final FrameSlot[] frameSlots;

    @Child private LLVMStatementNode statement;

    public LLVMFrameNuller(FrameSlot[] frameSlots, LLVMStatementNode statement) {
        this.frameSlots = frameSlots;
        this.statement = statement;
    }

    @Override
    public String toString() {
        return getShortString("frameSlots");
    }

    @Specialization
    @ExplodeLoop
    public void doExecute(VirtualFrame frame) {
        if (statement != null) {
            statement.execute(frame);
        }
        for (int i = 0; i < frameSlots.length; i++) {
            LLVMFrameNullerUtil.nullFrameSlot(frame, frameSlots[i]);
        }
    }
}