Example usage for org.objectweb.asm MethodVisitor visitInsn

Introduction

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

Prototype

public void visitInsn(final int opcode) 

Source Link

Document

Visits a zero operand instruction.

Usage

From source file:com.nginious.http.xsp.StaticPart.java

License:Apache License

/**
 * Creates bytecode in a separate method for evaluating an expression.
 * /*  w  w w .  j av a 2  s.  c  o m*/
 * @param intClassName the binary class name of the class being created
 * @param writer the class writer
 * @throws XspException if unable to create bytecode
 */
void compileMethod(String intClassName, ClassWriter writer) throws XspException {
    if (!isExpression()) {
        return;
    }

    try {
        ExpressionParser parser = new ExpressionParser();
        TreeExpression expr = parser.parse(getExpressionContent());

        MethodVisitor visitor = writer.visitMethod(Opcodes.ACC_PRIVATE, this.methodName,
                "(Ljava/lang/StringBuffer;)V", null, null);
        visitor.visitCode();
        visitor.visitVarInsn(Opcodes.ALOAD, 1);

        if (expr.getType() == Type.ANY) {
            expr.compile(visitor, Type.STRING);
        } else {
            expr.compile(visitor);
        }

        if (expr.getType() == Type.BOOLEAN) {
            visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/StringBuffer", "append",
                    "(Z)Ljava/lang/StringBuffer;");
        } else if (expr.getType() == Type.DOUBLE) {
            visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/StringBuffer", "append",
                    "(D)Ljava/lang/StringBuffer;");
        } else if (expr.getType() == Type.INT) {
            visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/StringBuffer", "append",
                    "(I)Ljava/lang/StringBuffer;");
        } else if (expr.getType() == Type.STRING || expr.getType() == Type.ANY) {
            visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/StringBuffer", "append",
                    "(Ljava/lang/String;)Ljava/lang/StringBuffer;");
        }

        visitor.visitInsn(Opcodes.POP);
        visitor.visitInsn(Opcodes.RETURN);
        visitor.visitMaxs(5, 5);
        visitor.visitEnd();
    } catch (ExpressionException e) {
        throw new XspException("Invalid expression at " + getLocationDescriptor(), e);
    }
}

---

From source file:com.nginious.http.xsp.XspCompiler.java

License:Apache License

/**
 * Creates subclass of {@link XspService} for the XSP file represented by the specified document
 * tree node structure./* w  ww.  java 2s  .  c om*/
 * 
 * @param document the document tree node structure
 * @param srcFilePath the XSP file source path
 * @return a descriptor for the generated subclass
 * @throws XspException if unable to create subclass
 */
private ClassDescriptor compileService(DocumentPart document, String srcFilePath) throws XspException {
    ClassWriter writer = new ClassWriter(0);

    // Create class
    String packageName = document.getMetaContent("package");
    String intServiceClazzName = createIntServiceClassName(packageName, srcFilePath);
    String serviceClazzName = createServiceClassName(packageName, srcFilePath);
    writer.visit(Opcodes.V1_6, Opcodes.ACC_PUBLIC, intServiceClazzName, "Lcom/nginious/http/xsp/XspService;",
            "com/nginious/http/xsp/XspService", null);

    // Create constructor
    createConstructor(writer, "com/nginious/http/xsp/XspService");

    // Create xsp service method
    MethodVisitor visitor = createXspMethod(writer);

    Label tryLabel = new Label();
    Label startCatchLabel = new Label();
    Label endCatchLabel = new Label();

    // Start try block
    visitor.visitTryCatchBlock(tryLabel, startCatchLabel, endCatchLabel, "java/lang/Throwable");

    visitor.visitLabel(tryLabel);

    visitor.visitTypeInsn(Opcodes.NEW, "com/nginious/http/xsp/expr/HttpRequestVariables");
    visitor.visitInsn(Opcodes.DUP);
    visitor.visitVarInsn(Opcodes.ALOAD, 1);
    visitor.visitMethodInsn(Opcodes.INVOKESPECIAL, "com/nginious/http/xsp/expr/HttpRequestVariables", "<init>",
            "(Lcom/nginious/http/HttpRequest;)V");
    visitor.visitMethodInsn(Opcodes.INVOKESTATIC, "com/nginious/http/xsp/expr/Expression", "setVariables",
            "(Lcom/nginious/http/xsp/expr/Variables;)V");

    document.compile(intServiceClazzName, writer, visitor);

    visitor.visitLabel(startCatchLabel);
    visitor.visitMethodInsn(Opcodes.INVOKESTATIC, "com/nginious/http/xsp/expr/Expression", "removeVariables",
            "()V");

    visitor.visitLdcInsn(true);
    visitor.visitInsn(Opcodes.IRETURN);

    // Start finally block
    visitor.visitLabel(endCatchLabel);
    visitor.visitMethodInsn(Opcodes.INVOKESTATIC, "com/nginious/http/xsp/expr/Expression", "removeVariables",
            "()V");
    visitor.visitInsn(Opcodes.ATHROW);

    visitor.visitMaxs(12, 12);
    visitor.visitEnd();

    document.compileMethod(intServiceClazzName, writer);

    writer.visitEnd();
    byte[] clazzBytes = writer.toByteArray();
    return new ClassDescriptor(serviceClazzName, clazzBytes);
}

---

From source file:com.nginious.http.xsp.XspCompiler.java

License:Apache License

/**
 * Creates a constructor with no arguments for the XSP service class being created with the
 * specified class writer. Bytecode is created for calling the superclass constructor in the
 * superclass with the specified supperclass name.
 * /*w w  w.j a v a2s.  c o m*/
 * @param writer the class writer
 * @param superclassName the superclass name
 * @see XspService
 */
void createConstructor(ClassWriter writer, String superclassName) {
    MethodVisitor visitor = writer.visitMethod(Opcodes.ACC_PUBLIC, "<init>", "()V", null, null);
    visitor.visitCode();
    visitor.visitVarInsn(Opcodes.ALOAD, 0);
    visitor.visitMethodInsn(Opcodes.INVOKESPECIAL, superclassName, "<init>", "()V");
    visitor.visitInsn(Opcodes.RETURN);
    visitor.visitMaxs(1, 1);
    visitor.visitEnd();
}

---

From source file:com.nway.spring.jdbc.bean.AsmBeanProcessor.java

License:Apache License

private void visitInsn(MethodVisitor mv, int index) {

    switch (index) {
    case 1:/*  w w w. ja v  a2 s .  com*/
        mv.visitInsn(Opcodes.ICONST_1);
        break;
    case 2:
        mv.visitInsn(Opcodes.ICONST_2);
        break;
    case 3:
        mv.visitInsn(Opcodes.ICONST_3);
        break;
    case 4:
        mv.visitInsn(Opcodes.ICONST_4);
        break;
    case 5:
        mv.visitInsn(Opcodes.ICONST_5);
        break;
    default:
        mv.visitIntInsn(Opcodes.BIPUSH, index);
    }
}

---

From source file:com.nway.spring.jdbc.bean.AsmBeanProcessor.java

License:Apache License

/**
 *
 * //from  ww w .  j  ava2  s . c o  m
 *
 * @param cw
 * @param mv
 * @param processorName com/nway/commons/dbutils/DynamicBeanProcessorImpl
 * @param beanName com/nway/commons/dbutils/test/User
 * @return [0]:bean[1]createBean
 */
private Object[] prepScript(ClassWriter cw, MethodVisitor mv, String processorName, String beanName) {

    Object[] lab = new Object[2];

    cw.visit(Opcodes.V1_5, Opcodes.ACC_PUBLIC + Opcodes.ACC_SUPER, processorName, null,
            "com/nway/spring/jdbc/bean/DbBeanFactory", null);

    cw.visitSource(processorName.substring(processorName.lastIndexOf('/') + 1) + ".java", null);

    {
        mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "<init>", "()V", null, null);
        mv.visitCode();
        Label l0 = new Label();
        mv.visitLabel(l0);
        mv.visitLineNumber(6, l0);
        mv.visitVarInsn(Opcodes.ALOAD, 0);
        mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "com/nway/spring/jdbc/bean/DbBeanFactory", "<init>", "()V",
                false);
        mv.visitInsn(Opcodes.RETURN);
        Label l1 = new Label();
        mv.visitLabel(l1);
        mv.visitLocalVariable("this", "L" + processorName + ";", null, l0, l1, 0);
        mv.visitMaxs(1, 1);
        mv.visitEnd();
    }
    {
        mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "createBean",
                "(Ljava/sql/ResultSet;Ljava/lang/Class;)Ljava/lang/Object;",
                "<T:Ljava/lang/Object;>(Ljava/sql/ResultSet;Ljava/lang/Class<TT;>;)TT;",
                new String[] { "java/sql/SQLException" });
        mv.visitCode();
        Label l0 = new Label();
        mv.visitLabel(l0);
        mv.visitLineNumber(10, l0);
        mv.visitTypeInsn(Opcodes.NEW, beanName);
        mv.visitInsn(Opcodes.DUP);
        mv.visitMethodInsn(Opcodes.INVOKESPECIAL, beanName, "<init>", "()V", false);
        mv.visitVarInsn(Opcodes.ASTORE, 3);

        lab[0] = l0;
        lab[1] = mv;
    }

    return lab;
}

---

From source file:com.nway.spring.jdbc.bean.AsmBeanProcessor.java

License:Apache License

/**
 *
 * /*from  w w  w.  j  a  va2s . c om*/
 *
 * @param mv MethodVisitor
 * @param processorName com/nway/commons/dbutils/DynamicBeanProcessorImpl
 * @param beanName com/nway/commons/dbutils/test/User
 */
private void endScript(MethodVisitor mv, Label processorLabel, Label beanStart, int lineNumber,
        String processorName, String beanName) {

    Label l10 = new Label();
    mv.visitLabel(l10);
    mv.visitLineNumber(lineNumber, l10);
    mv.visitVarInsn(Opcodes.ALOAD, 3);
    mv.visitInsn(Opcodes.ARETURN);
    Label l11 = new Label();
    mv.visitLabel(l11);
    mv.visitLocalVariable("this", "L" + processorName + ";", null, processorLabel, l11, 0);
    mv.visitLocalVariable("rs", "Ljava/sql/ResultSet;", null, processorLabel, l11, 1);
    mv.visitLocalVariable("type", "Ljava/lang/Class;", "Ljava/lang/Class<TT;>;", processorLabel, l11, 2);
    mv.visitLocalVariable("bean", "L" + beanName + ";", null, beanStart, l11, 3);
    mv.visitMaxs(5, 4);
    mv.visitEnd();
}

---

From source file:com.openpojo.reflection.java.bytecode.asm.SubClassCreator.java

License:Open Source License

/**
 * This method will copy over the constructors to the subclass.
 *//*from   w  w w.j a v  a2 s.  c  om*/
@Override
public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
    LOGGER.debug("Method: " + name + " access:" + access + " desc:" + desc + " signature:" + signature
            + " exceptions:" + Arrays.toString(exceptions));
    if (name.equals("<init>") && access == ACC_PUBLIC || access == ACC_PROTECTED) {
        MethodVisitor mv = cw.visitMethod(access, name, desc, signature, exceptions);
        int counter = getParameterCount(desc);
        // wire constructor method to super
        {
            mv.visitCode();
            for (int idx = 0; idx <= counter; idx++) {
                mv.visitVarInsn(ALOAD, idx);
            }
            mv.visitMethodInsn(INVOKESPECIAL, className.replace(Java.PACKAGE_DELIMITER, Java.PATH_DELIMITER),
                    "<init>", desc, false);
            mv.visitInsn(RETURN);
            mv.visitMaxs(counter + 1, counter + 1);
            mv.visitEnd();
        }
    }

    return super.visitMethod(access, name, desc, signature, exceptions);
}

---

From source file:com.peergreen.arquillian.generator.CommonClassAdapter.java

License:Open Source License

public MethodVisitor callToSuperClass() {
    MethodVisitor mv = super.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
    mv.visitCode();//ww  w.  jav a  2  s.c o m
    mv.visitVarInsn(ALOAD, 0);
    mv.visitMethodInsn(INVOKESPECIAL, Type.getInternalName(superClass), "<init>", "()V");
    mv.visitInsn(RETURN);
    mv.visitMaxs(1, 1);
    mv.visitEnd();
    return mv;
}

---

From source file:com.peergreen.jartransformer.adapter.expiration.ExpirationDateClassAdapter.java

License:Apache License

/**
 * Visits the end of the class. This method, which is the last one to be
 * called, is used to inform the visitor that all the fields and methods of
 * the class have been visited.// www  .j ava2 s  .c  o m
 */
@Override
public void visitEnd() {
    if (isClass && !visitedStaticMethod) {
        // add static block if it doesn't exists
        MethodVisitor mv = cv.visitMethod(Opcodes.ACC_STATIC, "<clinit>", "()V", null, null);
        mv = new ExpirationDateMethodAdapter(mv, expirationDate);
        mv.visitCode();
        mv.visitInsn(RETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }

    super.visitEnd();
}

---

From source file:com.quartercode.jtimber.rh.agent.util.ASMUtils.java

License:Open Source License

/**
 * Generates the instructions to call the {@code addParent()} or {@code removeParent()} method on an object using {@code this} as the parent.
 * Note that an instanceof check is be executed beforehand in order to check whether the object is non-null and parent-aware.<br>
 * <br>/*from www  . j av a  2 s  .  co  m*/
 * The object the operation should be performed on needs to be the topmost value on the stack when the generated instructions are entered.
 * The rest of the stack is ignored by the generated instructions.
 * 
 * @param mv The {@link MethodVisitor} that should be used to generate the instructions.
 * @param methodName The name of the method to call ({@code "addParent"} or {@code "removeParent"}).
 */
public static void generateAddOrRemoveThisAsParent(MethodVisitor mv, String methodName) {

    // Skip the if-block if the condition below isn't true
    Label endIf = new Label();
    mv.visitInsn(DUP);
    mv.visitTypeInsn(INSTANCEOF, PARENT_AWARE_CLASS);
    mv.visitJumpInsn(IFEQ, endIf);

    /* if (object instanceof ParentAware) */
    {
        // Push a copy of the value because the parent watcher method will be invoked on it
        mv.visitInsn(DUP);

        // Push "this" because it will be used as the first argument for the following method call
        mv.visitVarInsn(ALOAD, 0);

        // Invoke the parent watcher method on the value (which implements the "ParentAware" interface) using "this" as the first argument
        mv.visitMethodInsn(INVOKEINTERFACE, PARENT_AWARE_CLASS, methodName, "(" + NODE_DESC + ")V", true);
    }

    mv.visitLabel(endIf);
}

---

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