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 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
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 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
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 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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package com.oracle.truffle.js.nodes.access;

import com.oracle.truffle.api.CompilerAsserts;
import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
import com.oracle.truffle.api.frame.Frame;
import com.oracle.truffle.api.frame.FrameDescriptor;
import com.oracle.truffle.api.frame.FrameSlotKind;
import com.oracle.truffle.js.nodes.JavaScriptNode;

public abstract class FrameSlotNode extends JavaScriptNode {

    protected final int slot;
    protected final Object identifier;

    protected FrameSlotNode(int slot, Object identifier) {
        this.slot = slot;
        this.identifier = identifier;
    }

    public final int getSlotIndex() {
        return slot;
    }

    /**
     * @return the identifier corresponding to this slot
     */
    public final Object getIdentifier() {
        return identifier;
    }

    public abstract ScopeFrameNode getLevelFrameNode();

    public boolean hasTemporalDeadZone() {
        return false;
    }

    protected final boolean isIllegal(Frame frame) {
        return frame.getTag(slot) == FrameSlotKind.Illegal.tag;
    }

    public abstract static class WithDescriptor extends FrameSlotNode {
        @CompilationFinal private FrameDescriptor frameDescriptor;

        protected WithDescriptor(int slot, Object identifier) {
            super(slot, identifier);
        }

        protected final boolean isBooleanKind(Frame frame) {
            return isOrSetKind(frame, FrameSlotKind.Boolean);
        }

        protected final boolean isIntegerKind(Frame frame) {
            return isOrSetKind(frame, FrameSlotKind.Int);
        }

        protected final boolean isDoubleKind(Frame frame) {
            return isOrSetKind(frame, FrameSlotKind.Double);
        }

        protected final boolean isLongKind(Frame frame) {
            return isOrSetKind(frame, FrameSlotKind.Long);
        }

        protected final boolean isIntegerKind(Frame frame, FrameSlotKind currentKind) {
            return isOrSetKind(frame, currentKind, FrameSlotKind.Int);
        }

        protected final boolean isDoubleKind(Frame frame, FrameSlotKind currentKind) {
            return isOrSetKind(frame, currentKind, FrameSlotKind.Double);
        }

        protected final boolean isLongKind(Frame frame, FrameSlotKind currentKind) {
            return isOrSetKind(frame, currentKind, FrameSlotKind.Long);
        }

        protected final void ensureObjectKind(Frame frame) {
            FrameDescriptor desc = getFrameDescriptor(frame);
            if (desc.getSlotKind(slot) != FrameSlotKind.Object) {
                CompilerDirectives.transferToInterpreterAndInvalidate();
                desc.setSlotKind(slot, FrameSlotKind.Object);
            }
        }

        private boolean isOrSetKind(Frame frame, FrameSlotKind targetKind) {
            FrameDescriptor desc = getFrameDescriptor(frame);
            FrameSlotKind currentKind = desc.getSlotKind(slot);
            return isOrSetKind(frame, desc, currentKind, targetKind);
        }

        private boolean isOrSetKind(Frame frame, FrameSlotKind currentKind, FrameSlotKind targetKind) {
            FrameDescriptor desc = getFrameDescriptor(frame);
            return isOrSetKind(frame, desc, currentKind, targetKind);
        }

        private boolean isOrSetKind(Frame frame, FrameDescriptor desc, FrameSlotKind currentKind, FrameSlotKind targetKind) {
            assert desc == frame.getFrameDescriptor();
            if (currentKind == targetKind) {
                return true;
            } else if (currentKind == FrameSlotKind.Illegal) {
                CompilerDirectives.transferToInterpreterAndInvalidate();
                desc.setSlotKind(slot, targetKind);
                return true;
            } else {
                if (targetKind == FrameSlotKind.Double) {
                    if (currentKind == FrameSlotKind.Int || currentKind == FrameSlotKind.Long) {
                        CompilerDirectives.transferToInterpreterAndInvalidate();
                        desc.setSlotKind(slot, FrameSlotKind.Double);
                        return true;
                    }
                } else if (targetKind == FrameSlotKind.Long) {
                    if (currentKind == FrameSlotKind.Int) {
                        CompilerDirectives.transferToInterpreterAndInvalidate();
                        desc.setSlotKind(slot, FrameSlotKind.Long);
                        return true;
                    }
                }
                return false;
            }
        }

        protected final FrameDescriptor getFrameDescriptor(Frame frame) {
            FrameDescriptor constantFrameDescriptor = frameDescriptor;
            if (constantFrameDescriptor == null) {
                CompilerDirectives.transferToInterpreterAndInvalidate();
                frameDescriptor = constantFrameDescriptor = frame.getFrameDescriptor();
            }
            assert constantFrameDescriptor == frame.getFrameDescriptor();
            CompilerAsserts.partialEvaluationConstant(constantFrameDescriptor);
            return constantFrameDescriptor;
        }
    }
}




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