/*

 * Copyright 1997-2009 Sun Microsystems, Inc.  All Rights Reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 *

 */

// Class Reflection contains utility methods needed for implementing the

// reflection api.

//

// Used by functions in the JVM interface.

//

// NOTE that in JDK 1.4 most of reflection is now implemented in Java

// using dynamic bytecode generation. The Array class has not yet been

// rewritten using bytecodes; if it were, most of the rest of this

// class could go away, as well as a few more entry points in jvm.cpp.

class FieldStream;

class Reflection: public AllStatic {

 private:

  // Access checking

  static bool reflect_check_access(klassOop field_class, AccessFlags acc, klassOop target_class, bool is_method_invoke, TRAPS);

  // Conversion

  static klassOop basic_type_mirror_to_arrayklass(oop basic_type_mirror, TRAPS);

  static oop      basic_type_arrayklass_to_mirror(klassOop basic_type_arrayklass, TRAPS);

  static objArrayHandle get_parameter_types(methodHandle method, int parameter_count, oop* return_type, TRAPS);

  static objArrayHandle get_exception_types(methodHandle method, TRAPS);

  // Creating new java.lang.reflect.xxx wrappers

  static Handle new_type(symbolHandle signature, KlassHandle k, TRAPS);

 public:

  // Constants defined by java reflection api classes

  enum SomeConstants {

    PUBLIC            = 0,

    DECLARED          = 1,

    MEMBER_PUBLIC     = 0,

    MEMBER_DECLARED   = 1,

    MAX_DIM           = 255

  };

  // Boxing. Returns boxed value of appropriate type. Throws IllegalArgumentException.

  static oop box(jvalue* v, BasicType type, TRAPS);

  // Unboxing. Returns type code and sets value.

  static BasicType unbox_for_primitive(oop boxed_value, jvalue* value, TRAPS);

  static BasicType unbox_for_regular_object(oop boxed_value, jvalue* value);

  // Widening of basic types. Throws IllegalArgumentException.

  static void widen(jvalue* value, BasicType current_type, BasicType wide_type, TRAPS);

  // Reflective array access. Returns type code. Throws ArrayIndexOutOfBoundsException.

  static BasicType array_get(jvalue* value, arrayOop a, int index, TRAPS);

  static void      array_set(jvalue* value, arrayOop a, int index, BasicType value_type, TRAPS);

  // Returns mirror on array element type (NULL for basic type arrays and non-arrays).

  static oop       array_component_type(oop mirror, TRAPS);

  // Object creation

  static arrayOop reflect_new_array(oop element_mirror, jint length, TRAPS);

  static arrayOop reflect_new_multi_array(oop element_mirror, typeArrayOop dimensions, TRAPS);

  // Verification

  static bool     verify_class_access(klassOop current_class, klassOop new_class, bool classloader_only);

  static bool     verify_field_access(klassOop current_class,

                                      klassOop resolved_class,

                                      klassOop field_class,

                                      AccessFlags access,

                                      bool classloader_only,

                                      bool protected_restriction = false);

  static bool     is_same_class_package(klassOop class1, klassOop class2);

  static bool     is_same_package_member(klassOop class1, klassOop class2, TRAPS);

  static bool can_relax_access_check_for(

    klassOop accessor, klassOop accesee, bool classloader_only);

  // inner class reflection

  // raise an ICCE unless the required relationship can be proven to hold

  // If inner_is_member, require the inner to be a member of the outer.

  // If !inner_is_member, require the inner to be anonymous (a non-member).

  // Caller is responsible for figuring out in advance which case must be true.

  static void check_for_inner_class(instanceKlassHandle outer, instanceKlassHandle inner,

                                    bool inner_is_member, TRAPS);

  //

  // Support for reflection based on dynamic bytecode generation (JDK 1.4)

  //

  // Create a java.lang.reflect.Method object based on a method

  static oop new_method(methodHandle method, bool intern_name, bool for_constant_pool_access, TRAPS);

  // Create a java.lang.reflect.Constructor object based on a method

  static oop new_constructor(methodHandle method, TRAPS);

  // Create a java.lang.reflect.Field object based on a field descriptor

  static oop new_field(fieldDescriptor* fd, bool intern_name, TRAPS);

  //---------------------------------------------------------------------------

  //

  // Support for old native code-based reflection (pre-JDK 1.4)

  //

  // NOTE: the method and constructor invocation code is still used

  // for startup time reasons; see reflectionCompat.hpp.

  //

  //---------------------------------------------------------------------------

#ifdef SUPPORT_OLD_REFLECTION

private:

  // method resolution for invoke

  static methodHandle resolve_interface_call(instanceKlassHandle klass, methodHandle method, KlassHandle recv_klass, Handle receiver, TRAPS);

  // Method call (shared by invoke_method and invoke_constructor)

  static oop  invoke(instanceKlassHandle klass, methodHandle method, Handle receiver, bool override, objArrayHandle ptypes, BasicType rtype, objArrayHandle args, bool is_method_invoke, TRAPS);

  // Narrowing of basic types. Used to create correct jvalues for

  // boolean, byte, char and short return return values from interpreter

  // which are returned as ints. Throws IllegalArgumentException.

  static void narrow(jvalue* value, BasicType narrow_type, TRAPS);

  // Conversion

  static BasicType basic_type_mirror_to_basic_type(oop basic_type_mirror, TRAPS);

  static bool match_parameter_types(methodHandle method, objArrayHandle types, int parameter_count, TRAPS);

  // Creating new java.lang.reflect.xxx wrappers

  static oop new_field(FieldStream* st, TRAPS);

public:

  // Field lookup and verification.

  static bool      resolve_field(Handle field_mirror, Handle& receiver, fieldDescriptor* fd, bool check_final, TRAPS);

  // Reflective field access. Returns type code. Throws IllegalArgumentException.

  static BasicType field_get(jvalue* value, fieldDescriptor* fd, Handle receiver);

  static void      field_set(jvalue* value, fieldDescriptor* fd, Handle receiver, BasicType value_type, TRAPS);

  // Reflective lookup of fields. Returns java.lang.reflect.Field instances.

  static oop         reflect_field(oop mirror, symbolOop field_name, jint which, TRAPS);

  static objArrayOop reflect_fields(oop mirror, jint which, TRAPS);

  // Reflective lookup of methods. Returns java.lang.reflect.Method instances.

  static oop         reflect_method(oop mirror, symbolHandle method_name, objArrayHandle types, jint which, TRAPS);

  static objArrayOop reflect_methods(oop mirror, jint which, TRAPS);

  // Reflective lookup of constructors. Returns java.lang.reflect.Constructor instances.

  static oop         reflect_constructor(oop mirror, objArrayHandle types, jint which, TRAPS);

  static objArrayOop reflect_constructors(oop mirror, jint which, TRAPS);

  // Method invokation through java.lang.reflect.Method

  static oop      invoke_method(oop method_mirror, Handle receiver, objArrayHandle args, TRAPS);

  // Method invokation through java.lang.reflect.Constructor

  static oop      invoke_constructor(oop method_mirror, objArrayHandle args, TRAPS);

#endif /* SUPPORT_OLD_REFLECTION */

};