Example usage for org.objectweb.asm MethodVisitor visitMaxs

Introduction

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

Prototype

public void visitMaxs(final int maxStack, final int maxLocals) 

Source Link

Document

Visits the maximum stack size and the maximum number of local variables of the method.

Usage

From source file:io.syncframework.optimizer.OControllerClassVisitor.java

License:Apache License

/**
 * Generates code:/*from   w w  w  .j ava2s  . c om*/
 * 
 * public Class<?>[] _asActionInterceptors(String name) {
 *    return _asInterceptors.get(name);
 * }
 */
public void createActionInterceptorsMethod() {
    MethodVisitor mv = cv.visitMethod(Opcodes.ACC_PUBLIC, "_asActionInterceptors",
            "(Ljava/lang/String;)[Ljava/lang/Class;", null, null);

    Label l0 = new Label();
    Label l1 = new Label();
    mv.visitLabel(l0);
    mv.visitFieldInsn(Opcodes.GETSTATIC, reflector.getClazzInternalName(), "_asInterceptors",
            "Ljava/util/Map;");
    mv.visitVarInsn(Opcodes.ALOAD, 1);
    mv.visitMethodInsn(Opcodes.INVOKEINTERFACE, "java/util/Map", "get",
            "(Ljava/lang/Object;)Ljava/lang/Object;", true);
    mv.visitTypeInsn(Opcodes.CHECKCAST, "[Ljava/lang/Class;");
    mv.visitInsn(Opcodes.ARETURN);

    mv.visitLabel(l1);
    mv.visitLocalVariable("this", reflector.getClazzDescriptor(), null, l0, l1, 0);
    mv.visitLocalVariable("name", "Ljava/lang/String;", null, l0, l1, 1);
    mv.visitMaxs(2, 2);

    mv.visitEnd();
}

---

From source file:io.syncframework.optimizer.OControllerClassVisitor.java

License:Apache License

/**
 * Generates this code:/* w ww. j av a  2  s.  c o  m*/
 * 
 * public boolean _asActionIsDefined(String name) {
 *    if(_asActions.containsKey(name))
 *       return true;
 *    return false;
 * }
 */
public void createActionIsDefinedMethod() {
    MethodVisitor mv = cv.visitMethod(Opcodes.ACC_PUBLIC, "_asActionIsDefined", "(Ljava/lang/String;)Z", null,
            null);
    Label l0 = new Label();
    Label l1 = new Label();
    Label l2 = new Label();
    Label l3 = new Label();

    mv.visitLabel(l0);
    mv.visitFieldInsn(Opcodes.GETSTATIC, reflector.getClazzInternalName(), "_asActions", "Ljava/util/Map;");
    mv.visitVarInsn(Opcodes.ALOAD, 1);
    mv.visitMethodInsn(Opcodes.INVOKEINTERFACE, "java/util/Map", "containsKey", "(Ljava/lang/Object;)Z", true);
    mv.visitJumpInsn(Opcodes.IFEQ, l1);

    mv.visitLabel(l2);
    mv.visitInsn(Opcodes.ICONST_1);
    mv.visitInsn(Opcodes.IRETURN);

    mv.visitLabel(l1);
    mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
    mv.visitInsn(Opcodes.ICONST_0);
    mv.visitInsn(Opcodes.IRETURN);

    mv.visitLabel(l3);
    mv.visitLocalVariable("this", reflector.getClazzDescriptor(), null, l0, l3, 0);
    mv.visitLocalVariable("name", "Ljava/lang/String;", null, l0, l3, 1);
    mv.visitMaxs(2, 2);

    mv.visitEnd();
}

---

From source file:io.syncframework.optimizer.OControllerClassVisitor.java

License:Apache License

/**
 * Generates context method setter: // w  w w  .  ja  va  2s  . c  o  m
 * 
 * public void _as(Application|Error|Message|...)Context((Application|Error|Message|...)Context variable) {
 *    this.variable = variable
 *       or
 *    // do nothing
 * }
 */
private void createContextMethod(String methodName, String typeDescriptor, String variableName) {
    if (variableName != null) {
        MethodVisitor mv = cv.visitMethod(Opcodes.ACC_PUBLIC, methodName, "(" + typeDescriptor + ")V", null,
                null);
        Label l0 = new Label();
        Label l1 = new Label();
        Label l2 = new Label();
        mv.visitLabel(l0);
        mv.visitVarInsn(Opcodes.ALOAD, 0);
        mv.visitVarInsn(Opcodes.ALOAD, 1);
        mv.visitFieldInsn(Opcodes.PUTFIELD, reflector.getClazzInternalName(), variableName, typeDescriptor);
        mv.visitLabel(l1);
        mv.visitInsn(Opcodes.RETURN);
        mv.visitLabel(l2);
        mv.visitLocalVariable("this", reflector.getClazzDescriptor(), null, l0, l2, 0);
        mv.visitLocalVariable(variableName, typeDescriptor, null, l0, l2, 1);
        mv.visitMaxs(2, 2);
        mv.visitEnd();
    } else {
        MethodVisitor mv = cv.visitMethod(Opcodes.ACC_PUBLIC, methodName, "(" + typeDescriptor + ")V", null,
                null);
        Label l0 = new Label();
        Label l1 = new Label();
        mv.visitLabel(l0);
        mv.visitInsn(Opcodes.RETURN);
        mv.visitLabel(l1);
        mv.visitLocalVariable("this", reflector.getClazzDescriptor(), null, l0, l1, 0);
        mv.visitLocalVariable("argument", typeDescriptor, null, l0, l1, 1);
    }
}

---

From source file:io.syncframework.optimizer.OControllerClassVisitor.java

License:Apache License

/**
 * Generates the code:/*w w  w  .  j a  v  a 2s .  c  o m*/
 * public Map<String, Class<?>> _asParameters() {
 *    return _asParameters;
 * }
 */
private void createParametersMethod() {
    MethodVisitor mv = cv.visitMethod(Opcodes.ACC_PUBLIC, "_asParameters", "()Ljava/util/Map;",
            "()Ljava/util/Map<Ljava/lang/String;Ljava/lang/Class<*>;>;", null);
    mv.visitCode();
    Label l0 = new Label();
    mv.visitLabel(l0);
    mv.visitFieldInsn(Opcodes.GETSTATIC, reflector.getClazzInternalName(), "_asParameters", "Ljava/util/Map;");
    mv.visitInsn(Opcodes.ARETURN);
    Label l1 = new Label();
    mv.visitLabel(l1);
    mv.visitLocalVariable("this", reflector.getClazzDescriptor(), null, l0, l1, 0);
    mv.visitMaxs(1, 1);
    mv.visitEnd();
}

---

From source file:io.syncframework.optimizer.OControllerClassVisitor.java

License:Apache License

/**
 * Generates the _asParameter() getter as
 * /*from  ww  w .  j  a  va2 s.co m*/
 * public Object _asParameter(String name) {
 *    if(name.equals("name"))
 *       return getName();
 *    if(name.equals("date"))
 *       return getDate();
 *    ...
 *    return null;
 * }
 */
private void createParametersGetterMethod() {
    MethodVisitor mv = cv.visitMethod(Opcodes.ACC_PUBLIC, "_asParameter",
            "(Ljava/lang/String;)Ljava/lang/Object;", null, null);

    Label start = new Label();
    Label next = new Label();
    Label variable = new Label();
    boolean first = true;

    for (String name : reflector.getParameters().keySet()) {
        Label l0 = null;
        Label l1 = new Label();

        if (first) {
            l0 = new Label();
            first = false;
        } else {
            l0 = next;
            next = new Label();
        }

        mv.visitLabel(l0);
        if (!first)
            mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
        mv.visitVarInsn(Opcodes.ALOAD, 1);
        mv.visitLdcInsn(name);
        mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals", "(Ljava/lang/Object;)Z", false);
        mv.visitJumpInsn(Opcodes.IFEQ, next);

        String methodGetterName = reflector.getGetters().get(name).getName();
        String methodGetterDesc = "()" + Type.getDescriptor(reflector.getParameters().get(name));

        mv.visitLabel(l1);
        mv.visitVarInsn(Opcodes.ALOAD, 0);
        mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, reflector.getClazzInternalName(), methodGetterName,
                methodGetterDesc, false);
        mv.visitInsn(Opcodes.ARETURN);
    }

    mv.visitLabel(next);
    mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
    mv.visitInsn(Opcodes.ACONST_NULL);
    mv.visitInsn(Opcodes.ARETURN);
    mv.visitLabel(variable);
    mv.visitLocalVariable("this", reflector.getClazzDescriptor(), null, start, variable, 0);
    mv.visitLocalVariable("name", "Ljava/lang/String;", null, start, variable, 1);
    mv.visitMaxs(2, 2);
    mv.visitEnd();
}

---

From source file:io.syncframework.optimizer.OControllerClassVisitor.java

License:Apache License

/**
 * Creates the code as:/*from w  w w  . j ava 2  s  . co  m*/
 * 
 * public void _asParameter(String name, Object value) {
 *    if(name.equals("name") {
 *       setName((String)value);
 *       return;
 *    }
 *   if(name.equals("date") {
 *      setDate((Date)value);
 *      return;
 *   }
 *   ...
 *    return;
 * } 
 */
private void createParametersSetterMethod() {
    MethodVisitor mv = cv.visitMethod(Opcodes.ACC_PUBLIC, "_asParameter",
            "(Ljava/lang/String;Ljava/lang/Object;)V", null, null);

    Label start = new Label();
    Label next = new Label();
    Label variable = new Label();
    boolean first = true;

    for (String name : reflector.getParameters().keySet()) {
        Label l0 = null;
        Label l1 = new Label();
        Label l2 = new Label();

        if (first) {
            l0 = new Label();
            first = false;
        } else {
            l0 = next;
            next = new Label();
        }

        mv.visitLabel(l0);
        if (!first)
            mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
        mv.visitVarInsn(Opcodes.ALOAD, 1);
        mv.visitLdcInsn(name);
        mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals", "(Ljava/lang/Object;)Z", false);
        mv.visitJumpInsn(Opcodes.IFEQ, next);

        Class<?> parameterType = reflector.getParameters().get(name);

        String setterMethodName = reflector.getSetters().get(name).getName();
        String setterMethodDesc = "(" + Type.getDescriptor(parameterType) + ")V";

        mv.visitLabel(l1);
        mv.visitVarInsn(Opcodes.ALOAD, 0);
        mv.visitVarInsn(Opcodes.ALOAD, 2);
        mv.visitTypeInsn(Opcodes.CHECKCAST, Type.getInternalName(parameterType));
        mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, reflector.getClazzInternalName(), setterMethodName,
                setterMethodDesc, false);

        mv.visitLabel(l2);
        mv.visitInsn(Opcodes.RETURN);
    }

    mv.visitLabel(next);
    mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
    mv.visitInsn(Opcodes.RETURN);

    mv.visitLabel(variable);
    mv.visitLocalVariable("this", reflector.getClazzDescriptor(), null, start, next, 0);
    mv.visitLocalVariable("name", "Ljava/lang/String;", null, start, next, 1);
    mv.visitLocalVariable("value", "Ljava/lang/Object;", null, start, next, 2);
    mv.visitMaxs(2, 3);
    mv.visitEnd();
}

---

From source file:io.syncframework.optimizer.OControllerClassVisitor.java

License:Apache License

/**
 * public Class<?> _asParameterConverter(String name) {
 *    return _asConverters.get(name);//from   ww  w.  j  av a2 s.c  om
 * }
 */
public void createParameterConverterMethod() {
    MethodVisitor mv = cv.visitMethod(Opcodes.ACC_PUBLIC, "_asParameterConverter",
            "(Ljava/lang/String;)Ljava/lang/Class;", null, null);
    Label l0 = new Label();
    mv.visitLabel(l0);
    mv.visitFieldInsn(Opcodes.GETSTATIC, reflector.getClazzInternalName(), "_asConverters", "Ljava/util/Map;");
    mv.visitVarInsn(Opcodes.ALOAD, 1);
    mv.visitMethodInsn(Opcodes.INVOKEINTERFACE, "java/util/Map", "get",
            "(Ljava/lang/Object;)Ljava/lang/Object;", true);
    mv.visitTypeInsn(Opcodes.CHECKCAST, "java/lang/Class");
    mv.visitInsn(Opcodes.ARETURN);

    Label l1 = new Label();
    mv.visitLocalVariable("this", reflector.getClazzDescriptor(), null, l0, l1, 0);
    mv.visitLocalVariable("name", "Ljava/lang/String;", null, l0, l1, 1);
    mv.visitMaxs(2, 2);
    mv.visitEnd();
}

---

From source file:io.syncframework.optimizer.OControllerClassVisitor.java

License:Apache License

/**
 * Generates the _asUrl() method with using a constant string
 * public String _asUrl() { return "/*"; }
 *///from  w  w  w  .  j a va2  s  .  c om
public void createUrlMethod() {
    MethodVisitor mv = cv.visitMethod(Opcodes.ACC_PUBLIC, "_asUrl", "()Ljava/lang/String;", null, null);
    mv.visitCode();
    Label l0 = new Label();
    mv.visitLabel(l0);
    mv.visitLdcInsn(reflector.getUrl());
    mv.visitInsn(Opcodes.ARETURN);
    Label l1 = new Label();
    mv.visitLocalVariable("this", Type.getDescriptor(reflector.getClazz()), null, l0, l1, 0);
    mv.visitMaxs(1, 1);
    mv.visitEnd();
}

---

From source file:io.syncframework.optimizer.OInitializerClassVisitor.java

License:Apache License

/**
 * Generates the code:/*from   ww w.ja v  a  2 s.c  om*/
 * 
 * public void _asDestroy() {
 *    return destroy();
 * }
 */
public void createDestroyMethod() {
    MethodVisitor mv = cv.visitMethod(Opcodes.ACC_PUBLIC, "_asDestroy", "()V", null, null);
    Label l0 = new Label();
    if (reflector.getInit() != null) {
        mv.visitLabel(l0);
        mv.visitVarInsn(Opcodes.ALOAD, 0);
        mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, reflector.getClazzInternalName(), "destroy", "()V", false);
        mv.visitInsn(Opcodes.RETURN);
    } else {
        mv.visitLabel(l0);
        mv.visitInsn(Opcodes.RETURN);
    }

    Label l1 = new Label();
    mv.visitLocalVariable("this", reflector.getClazzDescriptor(), null, l0, l1, 0);
    mv.visitMaxs(1, 1);
    mv.visitEnd();
}

---

From source file:io.syncframework.optimizer.OInitializerClassVisitor.java

License:Apache License

/**
 * Generates the code:// ww w. j a v a 2 s  .co m
 * 
 * public void _asInit() {
 *    return init();
 * }
 */
public void createInitMethod() {
    MethodVisitor mv = cv.visitMethod(Opcodes.ACC_PUBLIC, "_asInit", "()V", null, null);
    Label l0 = new Label();
    if (reflector.getInit() != null) {
        mv.visitLabel(l0);
        mv.visitVarInsn(Opcodes.ALOAD, 0);
        mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, reflector.getClazzInternalName(), "init", "()V", false);
        mv.visitInsn(Opcodes.RETURN);
    } else {
        mv.visitLabel(l0);
        mv.visitInsn(Opcodes.RETURN);
    }
    Label l1 = new Label();
    mv.visitLocalVariable("this", reflector.getClazzDescriptor(), null, l0, l1, 0);
    mv.visitMaxs(1, 1);
    mv.visitEnd();
}

---

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