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hotspot/src/share/vm/runtime/reflection.hpp

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+/*
+ * Copyright 1997-2006 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 can_relax_access_check_for(
+    klassOop accessor, klassOop accesee, bool classloader_only);
+
+  // inner class reflection
+  static void check_for_inner_class(instanceKlassHandle outer, instanceKlassHandle inner, 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 */
+
+};