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

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Here is the source code for org.formulacompiler.compiler.internal.bytecode.ArrayAccessorForConstDataCompiler.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 org.formulacompiler.compiler.CompilerException;
import org.formulacompiler.compiler.internal.expressions.ArrayDescriptor;
import org.formulacompiler.compiler.internal.expressions.DataType;
import org.formulacompiler.compiler.internal.expressions.ExpressionNode;
import org.formulacompiler.compiler.internal.expressions.ExpressionNodeForArrayReference;
import org.formulacompiler.compiler.internal.expressions.ExpressionNodeForConstantValue;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.Label;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.objectweb.asm.commons.GeneratorAdapter;

final class ArrayAccessorForConstDataCompiler extends ArrayAccessorCompiler {

    public ArrayAccessorForConstDataCompiler(SectionCompiler _section, String _name,
            ExpressionNodeForArrayReference _node) {
        super(_section, "$constarr$" + _name, _node);
    }

    @Override
    protected void compileBody() throws CompilerException {
        final GeneratorAdapter mv = mv();
        final ArrayDescriptor dim = this.arrayNode.arrayDescriptor();
        final int n = dim.numberOfElements();
        final DataType eltDataType = this.arrayNode.getDataType();
        final TypeCompiler eltCompiler = section().engineCompiler().typeCompiler(eltDataType);
        final Type eltType = eltCompiler.type();

        // private double[] xy;
        final FieldVisitor fv = cw().visitField(Opcodes.ACC_PRIVATE, methodName(), arrayDescriptor(), null, null);
        fv.visitEnd();

        // if (this.xy == null) {
        final Label skipInit = mv.newLabel();
        mv.loadThis();
        mv.visitFieldInsn(Opcodes.GETFIELD, section().classInternalName(), methodName(), arrayDescriptor());
        mv.ifNonNull(skipInit);

        // ... new double[ n ]
        mv.loadThis();
        mv.push(n);
        mv.newArray(eltType);

        // ... { c1, c2, ... }
        int i = 0;
        for (ExpressionNode elt : this.arrayNode.arguments()) {
            if (elt instanceof ExpressionNodeForConstantValue) {
                mv.visitInsn(Opcodes.DUP);
                mv.push(i);
                final ExpressionNodeForConstantValue constElt = (ExpressionNodeForConstantValue) elt;
                eltCompiler.compileConst(mv, constElt.value());
                mv.arrayStore(eltType);
            }
            i++;
        }

        // this.xy *=* new double[] { ... }
        mv.visitFieldInsn(Opcodes.PUTFIELD, section().classInternalName(), methodName(), arrayDescriptor());

        // }
        // return this.xy;
        mv.mark(skipInit);
        mv.loadThis();
        mv.visitFieldInsn(Opcodes.GETFIELD, section().classInternalName(), methodName(), arrayDescriptor());
        mv.visitInsn(Opcodes.ARETURN);
    }

}