/*
 * Copyright (c) 2016, 2019, Oracle and/or its affiliates.
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 * All rights reserved.
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 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
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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.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors may be used to
 * endorse or promote products derived from this software without specific prior written
 * permission.
 *
 * 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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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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package com.oracle.truffle.llvm.runtime.nodes.func;

import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMExpressionNode;
import com.oracle.truffle.llvm.runtime.pointer.LLVMPointer;

public abstract class LLVMArgNode extends LLVMExpressionNode {

    private final int index;

    protected LLVMArgNode(int index) {
        this.index = index;
    }

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

    @Specialization(guards = "isPointer(frame)")
    protected Object doPointer(VirtualFrame frame) {
        /*
         * Copying the address objects prevents that otherwise virtualized objects that are used in
         * a phi together with a materialized passed address object also have to be materialized.
         */
        return LLVMPointer.cast(frame.getArguments()[index]).copy();
    }

    public boolean isPointer(VirtualFrame frame) {
        return LLVMPointer.isInstance(frame.getArguments()[index]);
    }

    @Specialization(guards = "!isPointer(frame)")
    protected Object doObject(VirtualFrame frame) {
        return frame.getArguments()[index];
    }
}