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 * Copyright (c) 2016, Oracle and/or its affiliates.
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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:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of
 * conditions and the following disclaimer.
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 * 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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package com.oracle.truffle.llvm.runtime.interop;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.interop.MessageResolution;
import com.oracle.truffle.api.interop.Resolve;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.llvm.runtime.LLVMTruffleAddress;
import com.oracle.truffle.llvm.runtime.interop.LLVMAddressMessageResolutionNode.LLVMAddressReadMessageResolutionNode;
import com.oracle.truffle.llvm.runtime.interop.LLVMAddressMessageResolutionNode.LLVMAddressWriteMessageResolutionNode;
import com.oracle.truffle.llvm.runtime.interop.LLVMAddressMessageResolutionNodeFactory.LLVMAddressReadMessageResolutionNodeGen;
import com.oracle.truffle.llvm.runtime.interop.LLVMAddressMessageResolutionNodeFactory.LLVMAddressWriteMessageResolutionNodeGen;

@MessageResolution(receiverType = LLVMTruffleAddress.class)
public class LLVMAddressMessageResolution {

    @Resolve(message = "HAS_SIZE")
    public abstract static class ForeignHasSize extends Node {
        @SuppressWarnings("unused")
        protected boolean access(VirtualFrame frame, LLVMTruffleAddress receiver) {
            return true;
        }
    }

    @Resolve(message = "IS_POINTER")
    public abstract static class ForeignIsPointer extends Node {
        @SuppressWarnings("unused")
        protected boolean access(VirtualFrame frame, LLVMTruffleAddress receiver) {
            return true;
        }
    }

    @Resolve(message = "AS_POINTER")
    public abstract static class ForeignAsPointer extends Node {
        @SuppressWarnings("unused")
        protected long access(VirtualFrame frame, LLVMTruffleAddress receiver) {
            return receiver.getAddress().getVal();
        }
    }

    @Resolve(message = "IS_NULL")
    public abstract static class ForeignIsNull extends Node {
        @SuppressWarnings("unused")
        protected boolean access(VirtualFrame frame, LLVMTruffleAddress receiver) {
            return isNull(receiver);
        }

    }

    private static boolean isNull(LLVMTruffleAddress receiver) {
        return receiver.getAddress().getVal() == 0;
    }

    @Resolve(message = "READ")
    public abstract static class ForeignRead extends Node {

        @Child private LLVMAddressReadMessageResolutionNode node;

        protected Object access(VirtualFrame frame, LLVMTruffleAddress receiver, int index) {
            if (isNull(receiver)) {
                CompilerDirectives.transferToInterpreter();
                throw new UnsupportedOperationException(String.format("Cannot read (identifier = %s) from null (0x0) pointer.", String.valueOf(index)));
            }
            if (node == null) {
                CompilerDirectives.transferToInterpreterAndInvalidate();
                node = insert(LLVMAddressReadMessageResolutionNodeGen.create());
            }
            return node.executeWithTarget(frame, receiver, index);
        }
    }

    @Resolve(message = "WRITE")
    public abstract static class ForeignWrite extends Node {

        @Child private LLVMAddressWriteMessageResolutionNode node;

        protected Object access(VirtualFrame frame, LLVMTruffleAddress receiver, int index, Object value) {
            if (isNull(receiver)) {
                CompilerDirectives.transferToInterpreter();
                throw new UnsupportedOperationException(String.format("Cannot read (identifier = %s) from null (0x0) pointer.", String.valueOf(index)));
            }
            if (node == null) {
                CompilerDirectives.transferToInterpreterAndInvalidate();
                node = insert(LLVMAddressWriteMessageResolutionNodeGen.create());
            }
            return node.executeWithTarget(frame, receiver, index, value);
        }

    }
}