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 * 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.
 *
 * 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.parser.model;

import com.oracle.truffle.llvm.parser.LLVMParserRuntime;
import com.oracle.truffle.llvm.parser.ValueList;
import com.oracle.truffle.llvm.parser.metadata.MDAttachment;
import com.oracle.truffle.llvm.parser.metadata.MetadataAttachmentHolder;
import com.oracle.truffle.llvm.parser.model.symbols.constants.Constant;
import com.oracle.truffle.llvm.parser.model.visitors.SymbolVisitor;
import com.oracle.truffle.llvm.runtime.GetStackSpaceFactory;
import com.oracle.truffle.llvm.runtime.datalayout.DataLayout;
import com.oracle.truffle.llvm.runtime.except.LLVMParserException;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMExpressionNode;
import com.oracle.truffle.llvm.runtime.types.Type;
import com.oracle.truffle.llvm.runtime.types.VoidType;

public final class SymbolTable extends ValueList<SymbolImpl, SymbolVisitor> {

    private static final PlaceholderFactory<SymbolImpl, SymbolVisitor> PLACEHOLDER_FACTORY = () -> new Constant() {

        @Override
        public Type getType() {
            return VoidType.INSTANCE;
        }

        @Override
        public void accept(SymbolVisitor visitor) {
            throw new LLVMParserException("Unresolved Forward Reference!");
        }

        @Override
        public void replace(SymbolImpl oldValue, SymbolImpl newValue) {
            throw new LLVMParserException("Cannot replace Symbol in Forward Reference!");
        }

        @Override
        public String toString() {
            return "Forward Referenced Symbol";
        }

        @Override
        public LLVMExpressionNode createNode(LLVMParserRuntime runtime, DataLayout dataLayout, GetStackSpaceFactory stackFactory) {
            throw new LLVMParserException("Unresolved Forward Reference!");
        }
    };

    public SymbolTable() {
        super(PLACEHOLDER_FACTORY);
    }

    public void nameSymbol(int index, String name) {
        final SymbolImpl symbol = getOrNull(index);
        if (symbol instanceof ValueSymbol) {
            ((ValueSymbol) symbol).setName(name);

        } else if (symbol == null) {
            onParse(index, s -> {
                if (s instanceof ValueSymbol) {
                    ((ValueSymbol) s).setName(name);
                }
            });
        }
    }

    public void attachMetadata(int index, MDAttachment attachment) {
        final SymbolImpl symbol = getOrNull(index);
        if (symbol instanceof MetadataAttachmentHolder) {
            ((MetadataAttachmentHolder) symbol).attachMetadata(attachment);

        } else if (symbol == null) {
            onParse(index, s -> {
                if (s instanceof MetadataAttachmentHolder) {
                    ((MetadataAttachmentHolder) s).attachMetadata(attachment);
                }
            });
        }
    }
}