libjava/java/lang/Class.h

   1 // Class.h - Header file for java.lang.Class.  -*- c++ -*-
   2
   3 /* Copyright (C) 1998, 1999, 2000, 2001  Free Software Foundation
   4
   5    This file is part of libgcj.
   6
   7 This software is copyrighted work licensed under the terms of the
   8 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
   9 details.  */
  10
  11 // Written primary using compiler source and Class.java as guides.
  12 #ifndef __JAVA_LANG_CLASS_H__
  13 #define __JAVA_LANG_CLASS_H__
  14
  15 #pragma interface
  16
  17 #include <stddef.h>
  18 #include <java/lang/Object.h>
  19 #include <java/lang/String.h>
  20 #include <java/net/URL.h>
  21 #include <java/lang/reflect/Modifier.h>
  22 #include <java/security/ProtectionDomain.h>
  23
  24 // We declare these here to avoid including gcj/cni.h.
  25 extern "C" void _Jv_InitClass (jclass klass);
  26 extern "C" void _Jv_RegisterClasses (jclass *classes);
  27
  28 // This must be predefined with "C" linkage.
  29 extern "C" void *_Jv_LookupInterfaceMethodIdx (jclass klass, jclass iface,
  30                                                int meth_idx);
  31
  32 // These are the possible values for the `state' field of the class
  33 // structure.  Note that ordering is important here.  Whenever the
  34 // state changes, one should notify all waiters of this class.
  35 enum
  36 {
  37   JV_STATE_NOTHING = 0,         // Set by compiler.
  38
  39   JV_STATE_PRELOADING = 1,      // Can do _Jv_FindClass.
  40   JV_STATE_LOADING = 3,         // Has super installed.
  41   JV_STATE_LOADED = 5,          // Is complete.
  42
  43   JV_STATE_COMPILED = 6,        // This was a compiled class.
  44
  45   JV_STATE_PREPARED = 7,        // Layout & static init done.
  46   JV_STATE_LINKED = 9,          // Strings interned.
  47
  48   JV_STATE_IN_PROGRESS = 10,    // <Clinit> running.
  49   JV_STATE_DONE = 12,           //
  50
  51   JV_STATE_ERROR = 14           // must be last.
  52 };
  53
  54 struct _Jv_Field;
  55 struct _Jv_VTable;
  56 union _Jv_word;
  57
  58 struct _Jv_Constants
  59 {
  60   jint size;
  61   jbyte *tags;
  62   _Jv_word *data;
  63 };
  64
  65 struct _Jv_Method
  66 {
  67   _Jv_Utf8Const *name;
  68   _Jv_Utf8Const *signature;
  69   _Jv_ushort accflags;
  70   void *ncode;
  71   _Jv_Method *getNextMethod ()
  72   { return this + 1; }
  73 };
  74
  75 // Interface Dispatch Tables
  76 union _Jv_IDispatchTable
  77 {
  78   struct
  79   {
  80     // Index into interface's ioffsets.
  81     jshort iindex;
  82     jshort itable_length;
  83     // Class Interface dispatch table.
  84     void **itable;
  85   } cls;
  86
  87   struct
  88   {
  89     // Offsets into implementation class itables.
  90     jshort *ioffsets;
  91   } iface;
  92 };
  93
  94 // Used by _Jv_GetInterfaces ()
  95 struct _Jv_ifaces
  96 {
  97   jclass *list;
  98   jshort len;
  99   jshort count;
 100 };
 101
 102 // Used for vtable pointer manipulation.
 103 union _Jv_Self
 104 {
 105   char *vtable_ptr;
 106   jclass self;
 107 };
 108
 109 #define JV_PRIMITIVE_VTABLE ((_Jv_VTable *) -1)
 110
 111 #define JV_CLASS(Obj) ((jclass) (*(_Jv_VTable **) Obj)->clas)
 112
 113 class java::lang::Class : public java::lang::Object
 114 {
 115 public:
 116   static jclass forName (jstring className, jboolean initialize,
 117                          java::lang::ClassLoader *loader);
 118   static jclass forName (jstring className);
 119   JArray<jclass> *getClasses (void);
 120
 121   java::lang::ClassLoader *getClassLoader (void)
 122     {
 123       return loader;
 124     }
 125
 126   java::lang::reflect::Constructor *getConstructor (JArray<jclass> *);
 127   JArray<java::lang::reflect::Constructor *> *getConstructors (void);
 128   java::lang::reflect::Constructor *getDeclaredConstructor (JArray<jclass> *);
 129   JArray<java::lang::reflect::Constructor *> *getDeclaredConstructors (void);
 130   java::lang::reflect::Field *getDeclaredField (jstring);
 131   JArray<java::lang::reflect::Field *> *getDeclaredFields (void);
 132   java::lang::reflect::Method *getDeclaredMethod (jstring, JArray<jclass> *);
 133   JArray<java::lang::reflect::Method *> *getDeclaredMethods (void);
 134
 135   JArray<jclass> *getDeclaredClasses (void);
 136   jclass getDeclaringClass (void);
 137
 138   java::lang::reflect::Field *getField (jstring);
 139 private:
 140   jint _getFields (JArray<java::lang::reflect::Field *> *result, jint offset);
 141   JArray<java::lang::reflect::Constructor *> *_getConstructors (jboolean);
 142   java::lang::reflect::Field *getField (jstring, jint);
 143   jint _getMethods (JArray<java::lang::reflect::Method *> *result,
 144                     jint offset);
 145   java::lang::reflect::Field *getPrivateField (jstring);
 146   java::lang::reflect::Method *getPrivateMethod (jstring, JArray<jclass> *);
 147   java::security::ProtectionDomain *getProtectionDomain0 ();
 148
 149 public:
 150   JArray<java::lang::reflect::Field *> *getFields (void);
 151
 152   JArray<jclass> *getInterfaces (void);
 153
 154   void getSignature (java::lang::StringBuffer *buffer);
 155   static jstring getSignature (JArray<jclass> *, jboolean is_constructor);
 156   java::lang::reflect::Method *getMethod (jstring, JArray<jclass> *);
 157   JArray<java::lang::reflect::Method *> *getMethods (void);
 158
 159   inline jint getModifiers (void)
 160     {
 161       return accflags;
 162     }
 163
 164   jstring getName (void);
 165
 166   java::net::URL        *getResource (jstring resourceName);
 167   java::io::InputStream *getResourceAsStream (jstring resourceName);
 168   JArray<jobject> *getSigners (void);
 169
 170   inline jclass getSuperclass (void)
 171     {
 172       return superclass;
 173     }
 174
 175   inline jboolean isArray (void)
 176     {
 177       return name->data[0] == '[';
 178     }
 179
 180   inline jclass getComponentType (void)
 181     {
 182       return isArray () ? (* (jclass *) &methods) : 0;
 183     }
 184
 185   jboolean isAssignableFrom (jclass cls);
 186   jboolean isInstance (jobject obj);
 187
 188   inline jboolean isInterface (void)
 189   {
 190     return (accflags & java::lang::reflect::Modifier::INTERFACE) != 0;
 191   }
 192
 193   inline jboolean isPrimitive (void)
 194     {
 195       return vtable == JV_PRIMITIVE_VTABLE;
 196     }
 197
 198   jobject newInstance (void);
 199   jstring toString (void);
 200
 201   // FIXME: this probably shouldn't be public.
 202   jint size (void)
 203     {
 204       return size_in_bytes;
 205     }
 206
 207   // finalization
 208   void finalize ();
 209
 210   Class () {};
 211
 212   // This constructor is used to create Class object for the primitive
 213   // types. See prims.cc.
 214   Class (jobject cname, jbyte sig, jint len, jobject array_vtable)
 215   {
 216     using namespace java::lang::reflect;
 217     _Jv_Utf8Const *_Jv_makeUtf8Const (char *s, int len);
 218
 219     // C++ ctors set the vtbl pointer to point at an offset inside the vtable
 220     // object. That doesn't work for Java, so this hack adjusts it back.
 221     ((_Jv_Self *)this)->vtable_ptr -= 2 * sizeof (void *);
 222
 223     // We must initialize every field of the class.  We do this in the
 224     // same order they are declared in Class.h, except for fields that
 225     // are initialized to NULL.
 226     name = _Jv_makeUtf8Const ((char *) cname, -1);
 227     accflags = Modifier::PUBLIC | Modifier::FINAL | Modifier::ABSTRACT;
 228     method_count = sig;
 229     size_in_bytes = len;
 230     vtable = JV_PRIMITIVE_VTABLE;
 231     state = JV_STATE_DONE;
 232     depth = -1;
 233     if (method_count != 'V')
 234       _Jv_NewArrayClass (this, NULL, (_Jv_VTable *) array_vtable);
 235   }
 236
 237   static java::lang::Class class$;
 238
 239 private:
 240
 241   void checkMemberAccess (jint flags);
 242
 243   void initializeClass (void);
 244
 245   // Friend functions implemented in natClass.cc.
 246   friend _Jv_Method *_Jv_GetMethodLocal (jclass klass, _Jv_Utf8Const *name,
 247                                          _Jv_Utf8Const *signature);
 248   friend jboolean _Jv_IsAssignableFrom(jclass, jclass);
 249   friend jboolean _Jv_InterfaceAssignableFrom (jclass, jclass);
 250   friend void *_Jv_LookupInterfaceMethodIdx (jclass klass, jclass iface,
 251                                              int method_idx);
 252
 253   inline friend void
 254   _Jv_InitClass (jclass klass)
 255   {
 256     if (__builtin_expect (klass->state == JV_STATE_DONE, true))
 257       return;
 258     klass->initializeClass ();
 259   }
 260
 261   friend _Jv_Method* _Jv_LookupDeclaredMethod (jclass, _Jv_Utf8Const *,
 262                                                _Jv_Utf8Const*);
 263   friend jfieldID JvGetFirstInstanceField (jclass);
 264   friend jint JvNumInstanceFields (jclass);
 265   friend jfieldID JvGetFirstStaticField (jclass);
 266   friend jint JvNumStaticFields (jclass);
 267
 268   friend jobject _Jv_AllocObject (jclass, jint);
 269   friend void *_Jv_AllocObj (jint, jclass);
 270   friend void *_Jv_AllocArray (jint, jclass);
 271
 272   friend jobject _Jv_JNI_ToReflectedField (_Jv_JNIEnv *, jclass, jfieldID,
 273                                            jboolean);
 274   friend jobject _Jv_JNI_ToReflectedMethod (_Jv_JNIEnv *, jclass, jmethodID,
 275                                             jboolean);
 276   friend jfieldID _Jv_FromReflectedField (java::lang::reflect::Field *);
 277
 278   friend jmethodID _Jv_FromReflectedMethod (java::lang::reflect::Method *);
 279   friend jmethodID _Jv_FromReflectedConstructor (java::lang::reflect::Constructor *);
 280   friend jint JvNumMethods (jclass);
 281   friend jmethodID JvGetFirstMethod (jclass);
 282
 283   // Friends classes and functions to implement the ClassLoader
 284   friend class java::lang::ClassLoader;
 285
 286   friend class java::io::ObjectOutputStream;
 287   friend class java::io::ObjectInputStream;
 288   friend class java::io::ObjectStreamClass;
 289
 290   friend void _Jv_WaitForState (jclass, int);
 291   friend void _Jv_RegisterClasses (jclass *classes);
 292   friend void _Jv_RegisterInitiatingLoader (jclass,java::lang::ClassLoader*);
 293   friend void _Jv_UnregisterClass (jclass);
 294   friend jclass _Jv_FindClass (_Jv_Utf8Const *name,
 295                                java::lang::ClassLoader *loader);
 296   friend jclass _Jv_FindClassInCache (_Jv_Utf8Const *name,
 297                                       java::lang::ClassLoader *loader);
 298   friend void _Jv_NewArrayClass (jclass element,
 299                                  java::lang::ClassLoader *loader,
 300                                  _Jv_VTable *array_vtable = 0);
 301   friend jclass _Jv_NewClass (_Jv_Utf8Const *name, jclass superclass,
 302                               java::lang::ClassLoader *loader);
 303
 304   friend void _Jv_PrepareCompiledClass (jclass);
 305   friend void _Jv_PrepareConstantTimeTables (jclass);
 306   friend jshort _Jv_GetInterfaces (jclass, _Jv_ifaces *);
 307   friend void _Jv_GenerateITable (jclass, _Jv_ifaces *, jshort *);
 308   friend jstring _Jv_GetMethodString(jclass, _Jv_Utf8Const *);
 309   friend jshort _Jv_AppendPartialITable (jclass, jclass, void **, jshort);
 310   friend jshort _Jv_FindIIndex (jclass *, jshort *, jshort);
 311
 312   // Return array class corresponding to element type KLASS, creating it if
 313   // neccessary.
 314   inline friend jclass
 315   _Jv_GetArrayClass (jclass klass, java::lang::ClassLoader *loader)
 316   {
 317     if (__builtin_expect (!klass->arrayclass, false))
 318       _Jv_NewArrayClass (klass, loader);
 319     return klass->arrayclass;
 320   }
 321
 322 #ifdef INTERPRETER
 323   friend jboolean _Jv_IsInterpretedClass (jclass);
 324   friend void _Jv_InitField (jobject, jclass, _Jv_Field*);
 325   friend int _Jv_DetermineVTableIndex (jclass, _Jv_Utf8Const *,
 326                                        _Jv_Utf8Const*);
 327   friend void _Jv_InitField (jobject, jclass, int);
 328   friend _Jv_word _Jv_ResolvePoolEntry (jclass, int);
 329   friend _Jv_Method *_Jv_SearchMethodInClass (jclass cls, jclass klass,
 330                                               _Jv_Utf8Const *method_name,
 331                                               _Jv_Utf8Const *method_signature);
 332
 333   friend void _Jv_PrepareClass (jclass);
 334
 335   friend class _Jv_ClassReader;
 336   friend class _Jv_InterpClass;
 337   friend class _Jv_InterpMethod;
 338   friend class _Jv_InterpMethodInvocation;
 339 #endif
 340
 341 #ifdef JV_MARKOBJ_DECL
 342   friend JV_MARKOBJ_DECL;
 343 #endif
 344
 345   // Chain for class pool.
 346   jclass next;
 347   // Name of class.
 348   _Jv_Utf8Const *name;
 349   // Access flags for class.
 350   _Jv_ushort accflags;
 351   // The superclass, or null for Object.
 352   jclass superclass;
 353   // Class constants.
 354   _Jv_Constants constants;
 355   // Methods.  If this is an array class, then this field holds a
 356   // pointer to the element type.
 357   _Jv_Method *methods;
 358   // Number of methods.  If this class is primitive, this holds the
 359   // character used to represent this type in a signature.
 360   jshort method_count;
 361   // Number of methods in the vtable.
 362   jshort vtable_method_count;
 363   // The fields.
 364   _Jv_Field *fields;
 365   // Size of instance fields, in bytes.
 366   jint size_in_bytes;
 367   // Total number of fields (instance and static).
 368   jshort field_count;
 369   // Number of static fields.
 370   jshort static_field_count;
 371   // The vtbl for all objects of this class.
 372   _Jv_VTable *vtable;
 373   // Interfaces implemented by this class.
 374   jclass *interfaces;
 375   // The class loader for this class.
 376   java::lang::ClassLoader *loader;
 377   // Number of interfaces.
 378   jshort interface_count;
 379   // State of this class.
 380   jbyte state;
 381   // The thread which has locked this class.  Used during class
 382   // initialization.
 383   java::lang::Thread *thread;
 384   // How many levels of "extends" this class is removed from Object.
 385   jshort depth;
 386   // Vector of this class's superclasses, ordered by decreasing depth.
 387   jclass *ancestors;
 388   // Interface Dispatch Table.
 389   _Jv_IDispatchTable *idt;
 390   // Pointer to the class that represents an array of this class.
 391   jclass arrayclass;
 392   // Security Domain to which this class belongs (or null).
 393   java::security::ProtectionDomain *protectionDomain;
 394 };
 395
 396 #endif /* __JAVA_LANG_CLASS_H__ */