1 // natObject.cc - Implementation of the Object class.
3 /* Copyright (C) 1998, 1999, 2000 Free Software Foundation
5 This file is part of libgcj.
7 This software is copyrighted work licensed under the terms of the
8 Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
15 #pragma implementation "Object.h"
19 #include <java/lang/Object.h>
20 #include <java-threads.h>
21 #include <java/lang/CloneNotSupportedException.h>
22 #include <java/lang/IllegalArgumentException.h>
23 #include <java/lang/IllegalMonitorStateException.h>
24 #include <java/lang/InterruptedException.h>
25 #include <java/lang/NullPointerException.h>
26 #include <java/lang/Class.h>
27 #include <java/lang/Cloneable.h>
28 #include <java/lang/Thread.h>
30 #define CloneableClass _CL_Q34java4lang9Cloneable
31 extern java::lang::Class CloneableClass;
35 // This is used to represent synchronization information.
38 #if defined (_Jv_HaveCondDestroy) || defined (_Jv_HaveMutexDestroy)
39 // We only need to keep track of initialization state if we can
40 // possibly finalize this object.
43 _Jv_ConditionVariable_t condition;
50 java::lang::Object::getClass (void)
52 _Jv_VTable **dt = (_Jv_VTable **) this;
57 java::lang::Object::hashCode (void)
59 return _Jv_HashCode (this);
63 java::lang::Object::clone (void)
65 jclass klass = getClass ();
69 // We also clone arrays here. If we put the array code into
70 // __JArray, then we'd have to figure out a way to find the array
71 // vtbl when creating a new array class. This is easier, if uglier.
74 __JArray *array = (__JArray *) this;
75 jclass comp = getClass()->getComponentType();
77 if (comp->isPrimitive())
79 r = _Jv_NewPrimArray (comp, array->length);
80 eltsize = comp->size();
84 r = _Jv_NewObjectArray (array->length, comp, NULL);
85 eltsize = sizeof (jobject);
87 // We can't use sizeof on __JArray because we must account for
88 // alignment of the element type.
89 size = (_Jv_GetArrayElementFromElementType (array, comp) - (char *) array
90 + array->length * eltsize);
94 if (! CloneableClass.isAssignableFrom(klass))
95 JvThrow (new CloneNotSupportedException);
98 r = JvAllocObject (klass, size);
101 memcpy ((void *) r, (void *) this, size);
107 // Synchronization code.
110 // This global is used to make sure that only one thread sets an
111 // object's `sync_info' field.
112 static _Jv_Mutex_t sync_mutex;
114 // This macro is used to see if synchronization initialization is
116 #if defined (_Jv_HaveCondDestroy) || defined (_Jv_HaveMutexDestroy)
117 # define INIT_NEEDED(Obj) (! (Obj)->sync_info \
118 || ! ((_Jv_SyncInfo *) ((Obj)->sync_info))->init)
120 # define INIT_NEEDED(Obj) (! (Obj)->sync_info)
123 #if defined (_Jv_HaveCondDestroy) || defined (_Jv_HaveMutexDestroy)
124 // If we have to run a destructor for a sync_info member, then this
125 // function is registered as a finalizer for the sync_info.
127 finalize_sync_info (jobject obj)
129 _Jv_SyncInfo *si = (_Jv_SyncInfo *) obj;
130 #if defined (_Jv_HaveCondDestroy)
131 _Jv_CondDestroy (&si->condition);
133 #if defined (_Jv_HaveMutexDestroy)
134 _Jv_MutexDestroy (&si->mutex);
140 // This is called to initialize the sync_info element of an object.
142 java::lang::Object::sync_init (void)
144 _Jv_MutexLock (&sync_mutex);
145 // Check again to see if initialization is needed now that we have
147 if (INIT_NEEDED (this))
149 // We assume there are no pointers in the sync_info
152 // We always create a new sync_info, even if there is already
153 // one available. Any given object can only be finalized once.
154 // If we get here and sync_info is not null, then it has already
155 // been finalized. So if we just reinitialize the old one,
156 // we'll never be able to (re-)destroy the mutex and/or
157 // condition variable.
158 si = (_Jv_SyncInfo *) _Jv_AllocBytesChecked (sizeof (_Jv_SyncInfo));
159 _Jv_MutexInit (&si->mutex);
160 _Jv_CondInit (&si->condition);
161 #if defined (_Jv_HaveCondDestroy) || defined (_Jv_HaveMutexDestroy)
162 // Register a finalizer.
164 _Jv_RegisterFinalizer (si, finalize_sync_info);
166 sync_info = (jobject) si;
168 _Jv_MutexUnlock (&sync_mutex);
172 java::lang::Object::notify (void)
174 if (INIT_NEEDED (this))
176 _Jv_SyncInfo *si = (_Jv_SyncInfo *) sync_info;
177 if (_Jv_CondNotify (&si->condition, &si->mutex))
178 JvThrow (new IllegalMonitorStateException(JvNewStringLatin1
179 ("current thread not owner")));
183 java::lang::Object::notifyAll (void)
185 if (INIT_NEEDED (this))
187 _Jv_SyncInfo *si = (_Jv_SyncInfo *) sync_info;
188 if (_Jv_CondNotifyAll (&si->condition, &si->mutex))
189 JvThrow (new IllegalMonitorStateException(JvNewStringLatin1
190 ("current thread not owner")));
194 java::lang::Object::wait (jlong timeout, jint nanos)
196 if (INIT_NEEDED (this))
198 if (timeout < 0 || nanos < 0 || nanos > 999999)
199 JvThrow (new IllegalArgumentException);
200 _Jv_SyncInfo *si = (_Jv_SyncInfo *) sync_info;
201 switch (_Jv_CondWait (&si->condition, &si->mutex, timeout, nanos))
204 JvThrow (new IllegalMonitorStateException (JvNewStringLatin1
205 ("current thread not owner")));
206 case _JV_INTERRUPTED:
207 if (Thread::interrupted ())
208 JvThrow (new InterruptedException);
213 // Some runtime code.
216 // This function is called at system startup to initialize the
219 _Jv_InitializeSyncMutex (void)
221 _Jv_MutexInit (&sync_mutex);
225 _Jv_MonitorEnter (jobject obj)
228 JvThrow (new java::lang::NullPointerException);
229 if (INIT_NEEDED (obj))
231 _Jv_SyncInfo *si = (_Jv_SyncInfo *) obj->sync_info;
232 return _Jv_MutexLock (&si->mutex);
236 _Jv_MonitorExit (jobject obj)
239 JvAssert (! INIT_NEEDED (obj));
240 _Jv_SyncInfo *si = (_Jv_SyncInfo *) obj->sync_info;
241 if (_Jv_MutexUnlock (&si->mutex))
242 JvThrow (new java::lang::IllegalMonitorStateException);
247 _Jv_FinalizeObject (jobject obj)
249 // Ignore exceptions. From section 12.6 of the Java Language Spec.
254 catch (java::lang::Throwable *t)