262 lines
6.9 KiB
C++
262 lines
6.9 KiB
C++
// natObject.cc - Implementation of the Object class.
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/* Copyright (C) 1998, 1999, 2000 Free Software Foundation
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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#include <config.h>
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#include <string.h>
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#pragma implementation "Object.h"
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#include <gcj/cni.h>
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#include <jvm.h>
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#include <java/lang/Object.h>
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#include <java-threads.h>
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#include <java-signal.h>
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#include <java/lang/CloneNotSupportedException.h>
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#include <java/lang/IllegalArgumentException.h>
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#include <java/lang/IllegalMonitorStateException.h>
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#include <java/lang/InterruptedException.h>
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#include <java/lang/NullPointerException.h>
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#include <java/lang/Class.h>
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#include <java/lang/Cloneable.h>
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#include <java/lang/Thread.h>
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#define CloneableClass _CL_Q34java4lang9Cloneable
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extern java::lang::Class CloneableClass;
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// This is used to represent synchronization information.
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struct _Jv_SyncInfo
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{
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#if defined (_Jv_HaveCondDestroy) || defined (_Jv_HaveMutexDestroy)
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// We only need to keep track of initialization state if we can
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// possibly finalize this object.
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bool init;
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#endif
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_Jv_ConditionVariable_t condition;
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_Jv_Mutex_t mutex;
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};
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jclass
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java::lang::Object::getClass (void)
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{
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_Jv_VTable **dt = (_Jv_VTable **) this;
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return (*dt)->clas;
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}
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jint
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java::lang::Object::hashCode (void)
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{
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return _Jv_HashCode (this);
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}
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jobject
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java::lang::Object::clone (void)
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{
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jclass klass = getClass ();
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jobject r;
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jint size;
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// We also clone arrays here. If we put the array code into
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// __JArray, then we'd have to figure out a way to find the array
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// vtbl when creating a new array class. This is easier, if uglier.
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if (klass->isArray())
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{
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__JArray *array = (__JArray *) this;
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jclass comp = getClass()->getComponentType();
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jint eltsize;
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if (comp->isPrimitive())
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{
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r = _Jv_NewPrimArray (comp, array->length);
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eltsize = comp->size();
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}
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else
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{
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r = _Jv_NewObjectArray (array->length, comp, NULL);
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eltsize = sizeof (jobject);
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}
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// We can't use sizeof on __JArray because we must account for
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// alignment of the element type.
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size = (_Jv_GetArrayElementFromElementType (array, comp) - (char *) array
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+ array->length * eltsize);
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}
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else
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{
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if (! CloneableClass.isAssignableFrom(klass))
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JvThrow (new CloneNotSupportedException);
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size = klass->size();
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r = JvAllocObject (klass, size);
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}
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memcpy ((void *) r, (void *) this, size);
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return r;
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}
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//
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// Synchronization code.
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//
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// This global is used to make sure that only one thread sets an
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// object's `sync_info' field.
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static _Jv_Mutex_t sync_mutex;
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// This macro is used to see if synchronization initialization is
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// needed.
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#if defined (_Jv_HaveCondDestroy) || defined (_Jv_HaveMutexDestroy)
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# define INIT_NEEDED(Obj) (! (Obj)->sync_info \
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|| ! ((_Jv_SyncInfo *) ((Obj)->sync_info))->init)
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#else
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# define INIT_NEEDED(Obj) (! (Obj)->sync_info)
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#endif
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#if defined (_Jv_HaveCondDestroy) || defined (_Jv_HaveMutexDestroy)
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// If we have to run a destructor for a sync_info member, then this
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// function is registered as a finalizer for the sync_info.
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static void
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finalize_sync_info (jobject obj)
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{
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_Jv_SyncInfo *si = (_Jv_SyncInfo *) obj;
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#if defined (_Jv_HaveCondDestroy)
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_Jv_CondDestroy (&si->condition);
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#endif
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#if defined (_Jv_HaveMutexDestroy)
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_Jv_MutexDestroy (&si->mutex);
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#endif
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si->init = false;
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}
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#endif
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// This is called to initialize the sync_info element of an object.
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void
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java::lang::Object::sync_init (void)
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{
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_Jv_MutexLock (&sync_mutex);
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// Check again to see if initialization is needed now that we have
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// the lock.
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if (INIT_NEEDED (this))
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{
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// We assume there are no pointers in the sync_info
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// representation.
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_Jv_SyncInfo *si;
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// We always create a new sync_info, even if there is already
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// one available. Any given object can only be finalized once.
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// If we get here and sync_info is not null, then it has already
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// been finalized. So if we just reinitialize the old one,
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// we'll never be able to (re-)destroy the mutex and/or
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// condition variable.
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si = (_Jv_SyncInfo *) _Jv_AllocBytesChecked (sizeof (_Jv_SyncInfo));
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_Jv_MutexInit (&si->mutex);
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_Jv_CondInit (&si->condition);
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#if defined (_Jv_HaveCondDestroy) || defined (_Jv_HaveMutexDestroy)
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// Register a finalizer.
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si->init = true;
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_Jv_RegisterFinalizer (si, finalize_sync_info);
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#endif
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sync_info = (jobject) si;
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}
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_Jv_MutexUnlock (&sync_mutex);
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}
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void
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java::lang::Object::notify (void)
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{
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if (__builtin_expect (INIT_NEEDED (this), false))
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sync_init ();
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_Jv_SyncInfo *si = (_Jv_SyncInfo *) sync_info;
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if (__builtin_expect (_Jv_CondNotify (&si->condition, &si->mutex), false))
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JvThrow (new IllegalMonitorStateException(JvNewStringLatin1
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("current thread not owner")));
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}
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void
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java::lang::Object::notifyAll (void)
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{
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if (__builtin_expect (INIT_NEEDED (this), false))
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sync_init ();
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_Jv_SyncInfo *si = (_Jv_SyncInfo *) sync_info;
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if (__builtin_expect (_Jv_CondNotifyAll (&si->condition, &si->mutex), false))
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JvThrow (new IllegalMonitorStateException(JvNewStringLatin1
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("current thread not owner")));
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}
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void
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java::lang::Object::wait (jlong timeout, jint nanos)
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{
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if (__builtin_expect (INIT_NEEDED (this), false))
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sync_init ();
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if (__builtin_expect (timeout < 0 || nanos < 0 || nanos > 999999, false))
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JvThrow (new IllegalArgumentException);
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_Jv_SyncInfo *si = (_Jv_SyncInfo *) sync_info;
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switch (_Jv_CondWait (&si->condition, &si->mutex, timeout, nanos))
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{
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case _JV_NOT_OWNER:
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JvThrow (new IllegalMonitorStateException (JvNewStringLatin1
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("current thread not owner")));
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case _JV_INTERRUPTED:
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if (Thread::interrupted ())
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JvThrow (new InterruptedException);
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}
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}
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//
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// Some runtime code.
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//
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// This function is called at system startup to initialize the
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// `sync_mutex'.
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void
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_Jv_InitializeSyncMutex (void)
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{
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_Jv_MutexInit (&sync_mutex);
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}
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jint
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_Jv_MonitorEnter (jobject obj)
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{
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#ifndef HANDLE_SEGV
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if (__builtin_expect (! obj, false))
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JvThrow (new java::lang::NullPointerException);
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#endif
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if (__builtin_expect (INIT_NEEDED (obj), false))
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obj->sync_init ();
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_Jv_SyncInfo *si = (_Jv_SyncInfo *) obj->sync_info;
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return _Jv_MutexLock (&si->mutex);
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}
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jint
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_Jv_MonitorExit (jobject obj)
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{
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JvAssert (obj);
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JvAssert (! INIT_NEEDED (obj));
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_Jv_SyncInfo *si = (_Jv_SyncInfo *) obj->sync_info;
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if (__builtin_expect (_Jv_MutexUnlock (&si->mutex), false))
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JvThrow (new java::lang::IllegalMonitorStateException);
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return 0;
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}
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void
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_Jv_FinalizeObject (jobject obj)
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{
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// Ignore exceptions. From section 12.6 of the Java Language Spec.
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try
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{
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obj->finalize ();
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}
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catch (java::lang::Throwable *t)
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{
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// Ignore.
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}
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}
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