Example usage for org.objectweb.asm MethodVisitor visitJumpInsn

List of usage examples for org.objectweb.asm MethodVisitor visitJumpInsn

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Introduction

In this page you can find the example usage for org.objectweb.asm MethodVisitor visitJumpInsn.

Prototype

public void visitJumpInsn(final int opcode, final Label label)

Source Link

Document

Visits a jump instruction.

Usage

From source file:com.nginious.http.xsp.expr.LengthFunction.java

License:Apache License

/**
 * Creates bytecode for evaluating this function. The specified method
 * visitor is used to generate bytecode. The generated bytecode produces
 * a result of the specified type./*from   ww w  . j  ava  2 s .co m*/
 * 
 * @param visitor the method visitor
 * @param type the type
 */
void compile(MethodVisitor visitor, Type type) {
    value.compile(visitor, Type.STRING);
    visitor.visitVarInsn(Opcodes.ASTORE, 1);

    Label nullLabel = new Label();
    Label notNullLabel = new Label();

    visitor.visitVarInsn(Opcodes.ALOAD, 1);
    visitor.visitJumpInsn(Opcodes.IFNULL, nullLabel);

    visitor.visitVarInsn(Opcodes.ALOAD, 1);
    visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "length", "()I");
    visitor.visitJumpInsn(Opcodes.GOTO, notNullLabel);

    visitor.visitLabel(nullLabel);
    visitor.visitLdcInsn(0);

    visitor.visitLabel(notNullLabel);
}

From source file:com.nginious.http.xsp.expr.LessEqualsOperator.java

License:Apache License

/**
 * Creates bytecode for evaluating the argument values as integers. The bytecode
 * is generated using the specified method visitor.
 * /*from   w  ww. j  a  va2  s .  c  o  m*/
 * @param visitor the method visitor
 */
private void compileInt(MethodVisitor visitor) {
    Label labelFalse = new Label();
    Label labelEnd = new Label();

    value2.compile(visitor, Type.INT);
    value1.compile(visitor, Type.INT);

    visitor.visitJumpInsn(Opcodes.IF_ICMPLT, labelFalse);

    // True
    visitor.visitLdcInsn(true);
    visitor.visitJumpInsn(Opcodes.GOTO, labelEnd);

    // False
    visitor.visitLabel(labelFalse);
    visitor.visitLdcInsn(false);

    visitor.visitLabel(labelEnd);
}

From source file:com.nginious.http.xsp.expr.LessEqualsOperator.java

License:Apache License

/**
 * Creates bytecode for evaluating the argument values as doubles. The bytecode
 * is generated using the specified method visitor.
 * /* w  w  w . jav a 2  s  .  c om*/
 * @param visitor the method visitor
 */
private void compileDouble(MethodVisitor visitor) {
    Label labelFalse = new Label();
    Label labelEnd = new Label();

    value2.compile(visitor, Type.DOUBLE);
    value1.compile(visitor, Type.DOUBLE);

    visitor.visitInsn(Opcodes.DCMPL);
    visitor.visitJumpInsn(Opcodes.IFLT, labelFalse);

    // True
    visitor.visitLdcInsn(true);
    visitor.visitJumpInsn(Opcodes.GOTO, labelEnd);

    // False
    visitor.visitLabel(labelFalse);
    visitor.visitLdcInsn(false);

    visitor.visitLabel(labelEnd);
}

From source file:com.nginious.http.xsp.expr.LessOperator.java

License:Apache License

/**
 * Creates bytecode for evaluating the argument values as integers. The bytecode
 * is generated using the specified method visitor.
 * //from ww  w . j  ava2s . com
 * @param visitor the method visitor
 */
private void compileInt(MethodVisitor visitor) {
    Label labelFalse = new Label();
    Label labelEnd = new Label();

    value2.compile(visitor, Type.INT);
    value1.compile(visitor, Type.INT);

    visitor.visitJumpInsn(Opcodes.IF_ICMPLE, labelFalse);

    // True
    visitor.visitLdcInsn(true);
    visitor.visitJumpInsn(Opcodes.GOTO, labelEnd);

    // False
    visitor.visitLabel(labelFalse);
    visitor.visitLdcInsn(false);

    visitor.visitLabel(labelEnd);
}

From source file:com.nginious.http.xsp.expr.LessOperator.java

License:Apache License

/**
 * Creates bytecode for evaluating the argument values as doubles. The bytecode
 * is generated using the specified method visitor.
 * /*from w  ww. jav  a2 s.c  o m*/
 * @param visitor the method visitor
 */
private void compileDouble(MethodVisitor visitor) {
    Label labelFalse = new Label();
    Label labelEnd = new Label();

    value2.compile(visitor, Type.DOUBLE);
    value1.compile(visitor, Type.DOUBLE);

    visitor.visitInsn(Opcodes.DCMPL);
    visitor.visitJumpInsn(Opcodes.IFLE, labelFalse);

    // True
    visitor.visitLdcInsn(true);
    visitor.visitJumpInsn(Opcodes.GOTO, labelEnd);

    // False
    visitor.visitLabel(labelFalse);
    visitor.visitLdcInsn(false);

    visitor.visitLabel(labelEnd);
}

From source file:com.nginious.http.xsp.expr.MoreEqualsOperator.java

License:Apache License

/**
 * Creates bytecode for evaluating the argument values as integers. The bytecode
 * is generated using the specified method visitor.
 * /*from w  w w.  j  a  va  2  s . co m*/
 * @param visitor the method visitor
 */
private void compileInt(MethodVisitor visitor) {
    Label labelFalse = new Label();
    Label labelEnd = new Label();

    value1.compile(visitor, Type.INT);
    value2.compile(visitor, Type.INT);

    visitor.visitJumpInsn(Opcodes.IF_ICMPLT, labelFalse);

    // True
    visitor.visitLdcInsn(true);
    visitor.visitJumpInsn(Opcodes.GOTO, labelEnd);

    // False
    visitor.visitLabel(labelFalse);
    visitor.visitLdcInsn(false);

    visitor.visitLabel(labelEnd);
}

From source file:com.nginious.http.xsp.expr.MoreEqualsOperator.java

License:Apache License

/**
 * Creates bytecode for evaluating the argument values as doubles. The bytecode
 * is generated using the specified method visitor.
 * //w  w w  .j  av a 2s . c om
 * @param visitor the method visitor
 */
private void compileDouble(MethodVisitor visitor) {
    Label labelFalse = new Label();
    Label labelEnd = new Label();

    value1.compile(visitor, Type.DOUBLE);
    value2.compile(visitor, Type.DOUBLE);

    visitor.visitInsn(Opcodes.DCMPL);
    visitor.visitJumpInsn(Opcodes.IFLT, labelFalse);

    // True
    visitor.visitLdcInsn(true);
    visitor.visitJumpInsn(Opcodes.GOTO, labelEnd);

    // False
    visitor.visitLabel(labelFalse);
    visitor.visitLdcInsn(false);

    visitor.visitLabel(labelEnd);
}

From source file:com.nginious.http.xsp.expr.MoreOperator.java

License:Apache License

/**
 * Creates bytecode for evaluating the argument values as integers. The bytecode
 * is generated using the specified method visitor.
 * /*ww  w . j a v a 2  s.c om*/
 * @param visitor the method visitor
 */
private void compileInt(MethodVisitor visitor) {
    Label labelFalse = new Label();
    Label labelEnd = new Label();

    value1.compile(visitor, Type.INT);
    value2.compile(visitor, Type.INT);

    visitor.visitJumpInsn(Opcodes.IF_ICMPLE, labelFalse);

    // True
    visitor.visitLdcInsn(true);
    visitor.visitJumpInsn(Opcodes.GOTO, labelEnd);

    // False
    visitor.visitLabel(labelFalse);
    visitor.visitLdcInsn(false);

    visitor.visitLabel(labelEnd);
}

From source file:com.nginious.http.xsp.expr.MoreOperator.java

License:Apache License

/**
 * Creates bytecode for evaluating the argument values as doubles. The bytecode
 * is generated using the specified method visitor.
 * // w w w  .j  av a2s  . co  m
 * @param visitor the method visitor
 */
private void compileDouble(MethodVisitor visitor) {
    Label labelFalse = new Label();
    Label labelEnd = new Label();

    value1.compile(visitor, Type.DOUBLE);
    value2.compile(visitor, Type.DOUBLE);

    visitor.visitInsn(Opcodes.DCMPL);
    visitor.visitJumpInsn(Opcodes.IFLE, labelFalse);

    // True
    visitor.visitLdcInsn(true);
    visitor.visitJumpInsn(Opcodes.GOTO, labelEnd);

    // False
    visitor.visitLabel(labelFalse);
    visitor.visitLdcInsn(false);

    visitor.visitLabel(labelEnd);
}

From source file:com.nginious.http.xsp.expr.NotEqualsOperator.java

License:Apache License

/**
 * Compiles bytecode for evaluating this not equals operator producing
 * a string as result. The specified method visitor is used for generating
 * bytecode./*from   w  ww.ja va  2  s .com*/
 * 
 * @param visitor the method visitor
 */
private void compileString(MethodVisitor visitor) {
    Label trueLabel = new Label();
    Label falseLabel = new Label();
    Label nullLabel = new Label();

    value1.compile(visitor, Type.STRING);
    visitor.visitVarInsn(Opcodes.ASTORE, 1);
    value2.compile(visitor, Type.STRING);
    visitor.visitVarInsn(Opcodes.ASTORE, 2);

    visitor.visitVarInsn(Opcodes.ALOAD, 1);
    visitor.visitJumpInsn(Opcodes.IFNULL, nullLabel);
    visitor.visitVarInsn(Opcodes.ALOAD, 2);
    visitor.visitJumpInsn(Opcodes.IFNULL, nullLabel);

    visitor.visitVarInsn(Opcodes.ALOAD, 1);
    visitor.visitVarInsn(Opcodes.ALOAD, 2);
    visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Object", "equals", "(Ljava/lang/Object;)Z");
    visitor.visitJumpInsn(Opcodes.IFNE, falseLabel);

    visitor.visitLabel(nullLabel);
    visitor.visitLdcInsn(true);
    visitor.visitJumpInsn(Opcodes.GOTO, trueLabel);

    visitor.visitLabel(falseLabel);
    visitor.visitLdcInsn(false);

    visitor.visitLabel(trueLabel);
}