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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
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 * 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
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package com.oracle.truffle.llvm.parser.model.symbols.constants.aggregate;

import com.oracle.truffle.llvm.parser.model.SymbolTable;
import com.oracle.truffle.llvm.parser.model.symbols.globals.GlobalValueSymbol;
import com.oracle.truffle.llvm.parser.model.symbols.constants.AbstractConstant;
import com.oracle.truffle.llvm.parser.model.symbols.constants.Constant;
import com.oracle.truffle.llvm.runtime.types.ArrayType;
import com.oracle.truffle.llvm.runtime.types.StructureType;
import com.oracle.truffle.llvm.runtime.types.Type;
import com.oracle.truffle.llvm.runtime.types.VectorType;
import com.oracle.truffle.llvm.parser.model.SymbolImpl;

public abstract class AggregateConstant extends AbstractConstant {

    private final SymbolImpl[] elements;

    AggregateConstant(Type type, int size) {
        super(type);
        this.elements = new SymbolImpl[size];
    }

    public SymbolImpl getElement(int idx) {
        return elements[idx];
    }

    public int getElementCount() {
        return elements.length;
    }

    @Override
    public void replace(SymbolImpl oldValue, SymbolImpl newValue) {
        if (!(newValue instanceof Constant || newValue instanceof GlobalValueSymbol)) {
            throw new IllegalStateException("Values can only be replaced by Constants or Globals!");
        }
        for (int i = 0; i < elements.length; i++) {
            if (elements[i] == oldValue) {
                elements[i] = newValue;
            }
        }
    }

    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder();
        for (int i = 0; i < getElementCount(); i++) {
            if (i > 0) {
                sb.append(", ");
            }
            SymbolImpl value = getElement(i);
            sb.append(value.getType()).append(" ").append(value);
        }
        return sb.toString();
    }

    public static AggregateConstant fromData(Type type, long[] data) {
        final AggregateConstant aggregateConstant;
        final Type elementType;
        if (type instanceof ArrayType) {
            final ArrayType arrayType = (ArrayType) type;
            elementType = arrayType.getElementType();
            aggregateConstant = new ArrayConstant(arrayType, data.length);
        } else if (type instanceof VectorType) {
            final VectorType vectorType = (VectorType) type;
            elementType = vectorType.getElementType();
            aggregateConstant = new VectorConstant((VectorType) type, data.length);
        } else {
            throw new RuntimeException("Cannot create constant from data: " + type);
        }

        for (int i = 0; i < data.length; i++) {
            aggregateConstant.elements[i] = Constant.createFromData(elementType, data[i]);
        }

        return aggregateConstant;
    }

    public static AggregateConstant fromSymbols(SymbolTable symbols, Type type, int[] valueIndices) {
        final AggregateConstant aggregateConstant;
        if (type instanceof ArrayType) {
            aggregateConstant = new ArrayConstant((ArrayType) type, valueIndices.length);
        } else if (type instanceof StructureType) {
            aggregateConstant = new StructureConstant((StructureType) type, valueIndices.length);
        } else if (type instanceof VectorType) {
            aggregateConstant = new VectorConstant((VectorType) type, valueIndices.length);
        } else {
            throw new RuntimeException("No value constant implementation for " + type);
        }

        for (int elementIndex = 0; elementIndex < valueIndices.length; elementIndex++) {
            aggregateConstant.elements[elementIndex] = symbols.getForwardReferenced(valueIndices[elementIndex], aggregateConstant);
        }

        return aggregateConstant;
    }
}
