com.khubla.jvmbasic.jvmbasicc.function.impl.rule.lenfuncRule.java Source code

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Here is the source code for com.khubla.jvmbasic.jvmbasicc.function.impl.rule.lenfuncRule.java

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package com.khubla.jvmbasic.jvmbasicc.function.impl.rule;

/*
 * jvmBasic Copyright 2012, khubla.com
 *
 *   This program 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.
 *
 *    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */
import org.objectweb.asm.Opcodes;

import com.khubla.jvmbasic.jvmbasicc.compiler.Dispatcher;
import com.khubla.jvmbasic.jvmbasicc.compiler.GenerationContext;
import com.khubla.jvmbasic.jvmbasicc.compiler.RTLHelper;
import com.khubla.jvmbasic.jvmbasicc.function.BaseFunction;

/**
 * @author tome
 *         <p>
 *         executionContext.push(StringFunctions.LEN(this.executionContext.resolveValue(executionContext.pop())));
 *         </p>
 */
public class lenfuncRule extends BaseFunction {
    @Override
    public boolean execute(GenerationContext generationContext) throws Exception {
        try {
            /*
             * get the operands
             */
            Dispatcher.dispatchChildren(generationContext);
            generationContext.getMethodVisitor().visitVarInsn(Opcodes.ALOAD, 0);
            generationContext.getMethodVisitor().visitFieldInsn(Opcodes.GETFIELD, generationContext.getClassName(),
                    RTLHelper.EXECUTIONCONTEXT_NAME, RTLHelper.JASIC_RUNTIME_EXECUTIONCONTEXT_TYPE);
            generationContext.getMethodVisitor().visitVarInsn(Opcodes.ALOAD, 0);
            generationContext.getMethodVisitor().visitFieldInsn(Opcodes.GETFIELD, generationContext.getClassName(),
                    RTLHelper.EXECUTIONCONTEXT_NAME, RTLHelper.JASIC_RUNTIME_EXECUTIONCONTEXT_TYPE);
            generationContext.getMethodVisitor().visitVarInsn(Opcodes.ALOAD, 0);
            generationContext.getMethodVisitor().visitFieldInsn(Opcodes.GETFIELD, generationContext.getClassName(),
                    RTLHelper.EXECUTIONCONTEXT_NAME, RTLHelper.JASIC_RUNTIME_EXECUTIONCONTEXT_TYPE);
            generationContext.getMethodVisitor().visitMethodInsn(Opcodes.INVOKEVIRTUAL,
                    RTLHelper.JASIC_RUNTIME_EXECUTIONCONTEXT, "pop", "()Lcom/khubla/jvmbasic/jvmbasicrt/Value;");
            generationContext.getMethodVisitor().visitMethodInsn(Opcodes.INVOKEVIRTUAL,
                    RTLHelper.JASIC_RUNTIME_EXECUTIONCONTEXT, "resolveValue",
                    "(Lcom/khubla/jvmbasic/jvmbasicrt/Value;)Lcom/khubla/jvmbasic/jvmbasicrt/Value;");
            generationContext.getMethodVisitor().visitMethodInsn(Opcodes.INVOKESTATIC,
                    "com/khubla/jvmbasic/jvmbasicrt/StringFunctions", "LEN",
                    "(Lcom/khubla/jvmbasic/jvmbasicrt/Value;)Ljava/lang/Integer;");
            generationContext.getMethodVisitor().visitMethodInsn(Opcodes.INVOKEVIRTUAL,
                    RTLHelper.JASIC_RUNTIME_EXECUTIONCONTEXT, "push", "(Ljava/lang/Integer;)V");
            return true;
        } catch (final Exception e) {
            throw new Exception("Exception in execute", e);
        }
    }
}