Example usage for org.objectweb.asm Label Label

List of usage examples for org.objectweb.asm Label Label

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Introduction

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

Prototype

public Label()

Source Link

Document

Constructs a new label.

Usage

From source file:com.j2biz.pencil.asm.tree.LabelWrapper.java

License:Open Source License

public LabelWrapper() {
    this.label = new Label();
}

From source file:com.j2biz.pencil.asm.tree.LabelWrapper.java

License:Open Source License

public static LabelWrapper create() {
    return new LabelWrapper(new Label());
}

From source file:com.j2biz.pencil.asm.tree.LogMessageNode.java

License:Open Source License

/**
 * @param name/* w ww.j a  va 2 s  .c  om*/
 * @param template
 */
public LogMessageNode(final String name, final String template) {
    this.name = name;
    this.template = template;

    // TODO: isXXXEnabled() Methods are used by commons logging.
    // if you want to adapt this code for log4j, rewrite this code or
    // reimplement an own node.
    // ---------------------------------------------------------------------------
    isName = "is" + Character.toUpperCase(name.charAt(0)) + name.substring(1) + "Enabled";
    // ---------------------------------------------------------------------------

    this.templateParser = Template.parse(this.template);
    this.complex = checkParser(this.templateParser);
    this.scopeStart = new Label();
    this.scopeEnd = new Label();
}

From source file:com.j2biz.pencil.asm.tree.MethodInfoNode.java

License:Open Source License

public void addLogInitAtStaticBlock(ASMClassInfoNode classInfo) {
    addLabel(new Label());
    addLdc(classInfo.getClassName());//from w w  w  .  j a  va  2 s  .  co  m
    final MethodInsnNode methodInsn = new MethodInsnNode(Constants.INVOKESTATIC,
            "org/apache/commons/logging/LogFactory", "getLog",
            "(Ljava/lang/String;)Lorg/apache/commons/logging/Log;");
    addInstruction(methodInsn);
    final FieldInsnNode fieldInsn = new FieldInsnNode(Constants.PUTSTATIC, LogTransformer.LOGGER_FIELD_NAME,
            classInfo.getClassName(), "Lorg/apache/commons/logging/Log;");
    addInstruction(fieldInsn);
}

From source file:com.j2biz.pencil.asm.tree.MethodInfoNode.java

License:Open Source License

public void insertLogInitInClearStaticBlock(ASMClassInfoNode classInfo) {
    final FieldInsnNode fieldInsn = new FieldInsnNode(Constants.PUTSTATIC, LogTransformer.LOGGER_FIELD_NAME,
            classInfo.getClassName(), "Lorg/apache/commons/logging/Log;");
    addInstructionAtBeginning(fieldInsn);
    final MethodInsnNode methodInsn = new MethodInsnNode(Constants.INVOKESTATIC,
            "org/apache/commons/logging/LogFactory", "getLog",
            "(Ljava/lang/String;)Lorg/apache/commons/logging/Log;");
    addInstructionAtBeginning(methodInsn);

    addLdcAtBeginning(classInfo.getClassName());

    addLabelAtBeginning(new Label());
}

From source file:com.judoscript.jamaica.ASMJavaClassCreator.java

License:Open Source License

public Label getLabel(String label) throws JavaClassCreatorException {
    if (label == null)
        throw new JavaClassCreatorException("Label cannot be null.");

    Label l = labels.get(label);/*from   w  w w.j  a v a  2 s  .  c  om*/
    if (l == null) {
        l = new Label();
        labels.put(label, l);
    }
    return l;
}

From source file:com.khubla.jvmbasic.jvmbasicc.compiler.analysis.lines.LinesDatabase.java

License:Open Source License

/**
 * add a label//from  w w w  .  j a v a 2 s .  co  m
 */
private LineDeclaration addLine(LineContext lineContext, int codeLine, int basicLine) {
    if (null == getLine(basicLine)) {
        final LineDeclaration lineDeclaration = new LineDeclaration(lineContext, codeLine, basicLine,
                new Label());
        lines.put(basicLine, lineDeclaration);
        return lineDeclaration;
    } else {
        return null;
    }
}

From source file:com.khubla.jvmbasic.jvmbasicc.function.impl.rule.ifstmtRule.java

License:Open Source License

@Override
public boolean execute(GenerationContext generationContext) throws Exception {
    try {//from www.  j a v  a  2 s  . c  om
        if (generationContext.getParseTree().getChildCount() == 4) {
            /*
             * dispatch into the test
             */
            final GenerationContext testGenerationContext = new GenerationContext(generationContext,
                    generationContext.getParseTree().getChild(1));
            Dispatcher.dispatchChildren(testGenerationContext);
            /*
             * check the result
             */
            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,
                    "com/khubla/jvmbasic/jvmbasicrt/Value", "getBoolean", "()Ljava/lang/Boolean;");
            generationContext.getMethodVisitor().visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Boolean",
                    "booleanValue", "()Z");
            /*
             * check result
             */
            final Label l1 = new Label();
            generationContext.getMethodVisitor().visitJumpInsn(Opcodes.IFEQ, l1);
            /*
             * process the contained tree
             */
            final GenerationContext statementGenerationContext = new GenerationContext(generationContext,
                    generationContext.getParseTree().getChild(3));
            Dispatcher.dispatch(statementGenerationContext);
            /*
             * label to skip to
             */
            generationContext.getMethodVisitor().visitLabel(l1);
            generationContext.getMethodVisitor().visitFrame(Opcodes.F_SAME, 0, null, 0, null);
            return true;
        } else if (generationContext.getParseTree().getChildCount() == 3) {
            /*
             * dispatch into the test
             */
            final GenerationContext testGenerationContext = new GenerationContext(generationContext,
                    generationContext.getParseTree().getChild(1));
            Dispatcher.dispatchChildren(testGenerationContext);
            /*
             * check the result
             */
            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,
                    "com/khubla/jvmbasic/jvmbasicrt/Value", "getBoolean", "()Ljava/lang/Boolean;");
            generationContext.getMethodVisitor().visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Boolean",
                    "booleanValue", "()Z");
            /*
             * check result
             */
            final Label l1 = new Label();
            generationContext.getMethodVisitor().visitJumpInsn(Opcodes.IFEQ, l1);
            /*
             * process the contained tree
             */
            final GenerationContext statementGenerationContext = new GenerationContext(generationContext,
                    generationContext.getParseTree().getChild(2));
            Dispatcher.dispatch(statementGenerationContext);
            /*
             * label to skip to
             */
            generationContext.getMethodVisitor().visitLabel(l1);
            generationContext.getMethodVisitor().visitFrame(Opcodes.F_SAME, 0, null, 0, null);
            return true;
        } else {
            throw new Exception(
                    "Invalid number of tokens in subtree '" + generationContext.getParseTree().getChildCount()
                            + "' expected 3 on line number: " + generationContext.getLineNumber());
        }
    } catch (final Exception e) {
        throw new Exception("Exception in execute", e);
    }
}

From source file:com.khubla.jvmbasic.jvmbasicc.JVMBasicCompiler.java

License:Open Source License

/**
 * generate init./*www .  jav  a 2 s . c  o m*/
 * <p>
 * This inits the class members and assigns class members, such as the ExecutionContext.
 * </p>
 * <p>
 * <code>
 * public ExecutionContext executionContext = new ExecutionContext();
 * </code>
 * </p>
 */
protected void generateInit(String className, ClassWriter classWriter) throws Exception {
    try {
        final MethodVisitor methodVisitor = classWriter.visitMethod(Opcodes.ACC_PUBLIC, "<init>", "()V", null,
                null);
        methodVisitor.visitCode();
        /*
         * call init()
         */
        final Label l0 = new Label();
        methodVisitor.visitLabel(l0);
        methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);
        methodVisitor.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
        /*
         * create a new execution context and assign it
         */
        final Label l1 = new Label();
        methodVisitor.visitLabel(l1);
        methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);
        methodVisitor.visitTypeInsn(Opcodes.NEW, RTLHelper.JASIC_RUNTIME_EXECUTIONCONTEXT);
        methodVisitor.visitInsn(Opcodes.DUP);
        methodVisitor.visitMethodInsn(Opcodes.INVOKESPECIAL, RTLHelper.JASIC_RUNTIME_EXECUTIONCONTEXT, "<init>",
                "()V");
        methodVisitor.visitFieldInsn(Opcodes.PUTFIELD, className, RTLHelper.EXECUTIONCONTEXT_NAME,
                RTLHelper.JASIC_RUNTIME_EXECUTIONCONTEXT_TYPE);
        /*
         * return
         */
        final Label l2 = new Label();
        methodVisitor.visitLabel(l2);
        methodVisitor.visitLineNumber(8, l2);
        methodVisitor.visitInsn(Opcodes.RETURN);
        /*
         * declare variables
         */
        final Label l3 = new Label();
        methodVisitor.visitLabel(l3);
        methodVisitor.visitLocalVariable("this", "L" + className + ";", null, l0, l3, 0);
        methodVisitor.visitMaxs(3, 1);
        methodVisitor.visitEnd();
    } catch (final Exception e) {
        throw new Exception("Exception in generateInit", e);
    }
}

From source file:com.khubla.jvmbasic.jvmbasicc.JVMBasicCompiler.java

License:Open Source License

/**
 * generate void main(String[])/*from w ww .j  a  v  a2 s .  co  m*/
 * <p>
 * <code>
 * public static void main(String[] args) {
 *   ExampleProgram exampleProgram = new ExampleProgram();
 *  try {
 *       exampleProgram.inputStream = System.in;
 *       exampleProgram.outputStream = System.out;
 *       exampleProgram.program();
 *   } catch (Exception e) {
 *       e.printStackTrace();
 *    }
 *  }
 * </code>
 * </p>
 */
protected void generateMain(String classname, ClassWriter classWriter) throws Exception {
    try {
        /*
         * make method
         */
        final MethodVisitor methodVisitor = classWriter.visitMethod(Opcodes.ACC_PUBLIC + Opcodes.ACC_STATIC,
                "main", "([Ljava/lang/String;)V", null, null);
        methodVisitor.visitCode();
        final Label l0 = new Label();
        final Label l1 = new Label();
        final Label l2 = new Label();
        methodVisitor.visitTryCatchBlock(l0, l1, l2, "java/lang/Exception");
        final Label l3 = new Label();
        methodVisitor.visitLabel(l3);
        /*
         * declare a local instance of the class in the void() main, store as variable 1.
         */
        methodVisitor.visitTypeInsn(Opcodes.NEW, classname);
        methodVisitor.visitInsn(Opcodes.DUP);
        methodVisitor.visitMethodInsn(Opcodes.INVOKESPECIAL, classname, "<init>", "()V");
        methodVisitor.visitVarInsn(Opcodes.ASTORE, 1);
        /*
         * assign the input stream
         */
        methodVisitor.visitVarInsn(Opcodes.ALOAD, 1);
        methodVisitor.visitFieldInsn(Opcodes.GETSTATIC, "java/lang/System", "in", "Ljava/io/InputStream;");
        methodVisitor.visitFieldInsn(Opcodes.PUTFIELD, classname, "inputStream", "Ljava/io/InputStream;");
        /*
         * assign the output stream
         */
        methodVisitor.visitVarInsn(Opcodes.ALOAD, 1);
        methodVisitor.visitFieldInsn(Opcodes.GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
        methodVisitor.visitFieldInsn(Opcodes.PUTFIELD, classname, "outputStream", "Ljava/io/PrintStream;");
        /*
         * load the class instance from variable 1 and call "program"
         */
        methodVisitor.visitLabel(l0);
        methodVisitor.visitVarInsn(Opcodes.ALOAD, 1);
        methodVisitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, classname, "program", "()V");
        methodVisitor.visitLabel(l1);
        final Label l4 = new Label();
        methodVisitor.visitJumpInsn(Opcodes.GOTO, l4);
        methodVisitor.visitLabel(l2);
        methodVisitor.visitFrame(Opcodes.F_FULL, 2, new Object[] { "[Ljava/lang/String;", classname }, 1,
                new Object[] { "java/lang/Exception" });
        methodVisitor.visitVarInsn(Opcodes.ASTORE, 2);
        final Label l5 = new Label();
        methodVisitor.visitLabel(l5);
        methodVisitor.visitLineNumber(21, l5);
        methodVisitor.visitVarInsn(Opcodes.ALOAD, 2);
        methodVisitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Exception", "printStackTrace", "()V");
        /*
         * return
         */
        methodVisitor.visitLabel(l4);
        methodVisitor.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
        methodVisitor.visitInsn(Opcodes.RETURN);
        /*
         * declare the parameters
         */
        final Label l6 = new Label();
        methodVisitor.visitLabel(l6);
        methodVisitor.visitLocalVariable("args", "[Ljava/lang/String;", null, l3, l6, 0);
        methodVisitor.visitLocalVariable("exampleProgram", "L" + classname + ";", null, l0, l6, 1);
        methodVisitor.visitLocalVariable("e", "Ljava/lang/Exception;", null, l5, l4, 2);
        /*
         * done
         */
        methodVisitor.visitMaxs(2, 3);
        methodVisitor.visitEnd();
    } catch (final Exception e) {
        throw new Exception("Exception in generateMain", e);
    }
}