org.formulacompiler.compiler.internal.bytecode.IndexerCompiler.java Source code

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Here is the source code for org.formulacompiler.compiler.internal.bytecode.IndexerCompiler.java

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/*
 * Copyright (c) 2006-2009 by Abacus Research AG, Switzerland.
 * All rights reserved.
 *
 * This file is part of the Abacus Formula Compiler (AFC).
 *
 * For commercial licensing, please contact sales(at)formulacompiler.com.
 *
 * AFC is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * AFC is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with AFC.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.formulacompiler.compiler.internal.bytecode;

import java.util.List;

import org.formulacompiler.compiler.CompilerException;
import org.formulacompiler.compiler.internal.expressions.ExpressionNode;
import org.formulacompiler.compiler.internal.expressions.ExpressionNodeForArrayReference;
import org.objectweb.asm.Label;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.commons.GeneratorAdapter;

final class IndexerCompiler extends MethodCompiler {
    private final ExpressionNodeForArrayReference node;

    IndexerCompiler(SectionCompiler _section, String _name, ExpressionNodeForArrayReference _node) {
        super(_section, Opcodes.ACC_FINAL, "$idx$" + _name,
                "(I)" + _section.engineCompiler().typeCompiler(_node.getDataType()).typeDescriptor());
        this.node = _node;
    }

    @Override
    protected void compileBody() throws CompilerException {
        final ExpressionNodeForArrayReference arrayNode = this.node;
        final ExpressionCompiler valCompiler = expressionCompiler(arrayNode.getDataType());
        final GeneratorAdapter mv = mv();

        final List<ExpressionNode> vals = arrayNode.arguments();
        final int valCnt = vals.size();
        if (valCnt > 0) {
            mv.visitVarInsn(Opcodes.ILOAD, 1); // index

            // gen switch
            final int[] valIdxs = new int[valCnt];
            for (int i = 0; i < valCnt; i++) {
                valIdxs[i] = i;
            }
            compileTableSwitch(valIdxs, new TableSwitchGenerator() {

                @Override
                protected void generateCase(int _key, Label _end) throws CompilerException {
                    final ExpressionNode val = vals.get(_key);
                    valCompiler.compile(val);
                    mv.returnValue();
                }

            });
        }
        mv.throwException(ExpressionCompiler.FORMULA_ERROR_TYPE,
                "#VALUE/REF! because index is out of range in INDEX");
    }

}