/*
 * Copyright © 2024-2026 Apple Inc. and the Pkl project authors. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.pkl.core.ast.frame;

import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.frame.FrameSlotTypeException;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.source.SourceSection;
import org.pkl.core.ast.ExpressionNode;

public abstract class ReadExactFrameSlotNode extends ExpressionNode {
  private final int slot;

  protected ReadExactFrameSlotNode(SourceSection sourceSection, int slot) {
    super(sourceSection);
    this.slot = slot;
  }

  @Specialization(rewriteOn = FrameSlotTypeException.class)
  protected long evalInt(VirtualFrame frame) throws FrameSlotTypeException {
    return frame.getLong(slot);
  }

  @Specialization(rewriteOn = FrameSlotTypeException.class)
  protected double evalFloat(VirtualFrame frame) throws FrameSlotTypeException {
    return frame.getDouble(slot);
  }

  @Specialization(rewriteOn = FrameSlotTypeException.class)
  protected boolean evalBoolean(VirtualFrame frame) throws FrameSlotTypeException {
    return frame.getBoolean(slot);
  }

  @Specialization(rewriteOn = FrameSlotTypeException.class)
  protected Object evalObject(VirtualFrame frame) throws FrameSlotTypeException {
    return frame.getObject(slot);
  }

  @Specialization(replaces = {"evalInt", "evalFloat", "evalBoolean", "evalObject"})
  protected Object evalGeneric(VirtualFrame frame) {
    return frame.getValue(slot);
  }
}
