prims.cc: Some old cleanups.

* libjava/prims.cc: Some old cleanups.  The collector now
	handles test for out of memory.
	* libjava/prims.cc, libjava/gcj/javaprims.h:
	(_Jv_AllocObjectNoInitNoFinalizer, _Jv_AllocObjectNoFinalizer):
	New functions for finalizer-free allocation.
	(jvmpi_notify_alloc): Became separate function.
	* libjava/java/lang/Object.h, libjava/include/jvm.h: Adjust for
	revised vtable layout on IA64.  With TARGET_VTABLE_USES_DESCRIPTORS,
	there is only one extra descriptor.

From-SVN: r48002

libjava/ChangeLog

@@ -1,3 +1,16 @@
+2001-12-14  Hans Boehm  <Hans_Boehm@hp.com>
+	* libjava/prims.cc: Some old cleanups.  The collector now
+	handles test for out of memory.
+
+	* libjava/prims.cc, libjava/gcj/javaprims.h:
+	(_Jv_AllocObjectNoInitNoFinalizer, _Jv_AllocObjectNoFinalizer):
+	New functions for finalizer-free allocation.
+	(jvmpi_notify_alloc): Became separate function.
+
+	* libjava/java/lang/Object.h, libjava/include/jvm.h: Adjust for
+	revised vtable layout on IA64.  With TARGET_VTABLE_USES_DESCRIPTORS,
+	there is only one extra descriptor.
+
 2001-12-12  Tom Tromey  <tromey@redhat.com>
 
 	* prims.cc (_Jv_RunMain): Use `using' to simplify code.  Set

libjava/gcj/javaprims.h

@@ -384,6 +384,8 @@ typedef struct _Jv_Field *jfieldID;
 typedef struct _Jv_Method *jmethodID;
 
 extern "C" jobject _Jv_AllocObject (jclass, jint) __attribute__((__malloc__));
+extern "C" jobject _Jv_AllocObjectNoFinalizer (jclass, jint) __attribute__((__malloc__));
+extern "C" jobject _Jv_AllocObjectNoInitNoFinalizer (jclass, jint) __attribute__((__malloc__));
 #ifdef JV_HASH_SYNCHRONIZATION
   extern "C" jobject _Jv_AllocPtrFreeObject (jclass, jint)
   			    __attribute__((__malloc__));

libjava/include/jvm.h

@@ -28,18 +28,12 @@ details.  */
 struct _Jv_VTable
 {
 #ifdef __ia64__
-  jclass clas;
-  unsigned long : 64;
-  void *gc_descr;
-  unsigned long : 64;
-
   typedef struct { void *pc, *gp; } vtable_elt;
 #else
-  jclass clas;
-  void *gc_descr;
-
   typedef void *vtable_elt;
 #endif
+  jclass clas;
+  void *gc_descr;
 
   // This must be last, as derived classes "extend" this by
   // adding new data members.
@@ -48,12 +42,20 @@ struct _Jv_VTable
 #ifdef __ia64__
   void *get_method(int i) { return &method[i]; }
   void set_method(int i, void *fptr) { method[i] = *(vtable_elt *)fptr; }
+  void *get_finalizer()
+  {
+    // We know that get_finalizer is only used for checking whether
+    // this object needs to have a finalizer registered.  So it is
+    // safe to simply return just the PC component of the vtable
+    // slot.
+    return ((vtable_elt *)(get_method(0)))->pc;
+  }
 #else
   void *get_method(int i) { return method[i]; }
   void set_method(int i, void *fptr) { method[i] = fptr; }
+  void *get_finalizer() { return get_method(0); }
 #endif
 
-  void *get_finalizer() { return get_method(0); }
   static size_t vtable_elt_size() { return sizeof(vtable_elt); }
   static _Jv_VTable *new_vtable (int count);
 };

libjava/java/lang/Object.h

@@ -21,8 +21,11 @@ struct _JvObjectPrefix
 {
 protected:
   // New ABI Compatibility Dummy, #1 and 2.
-  virtual void nacd_1 (void) {};  // This slot really contains the Class pointer.
-  virtual void nacd_2 (void) {};  // Actually the GC bitmap marking descriptor.
+  virtual void nacd_1 (void) {}; // This slot really contains the Class pointer.
+  // For IA64, the GC descriptor goes into the second word of the nacd1 descr.
+# ifndef __ia64__
+    virtual void nacd_2 (void) {}; // Actually the GC bitmap marking descriptor.
+# endif
 };
 
 class java::lang::Object : public _JvObjectPrefix

libjava/prims.cc

@@ -256,8 +256,6 @@ _Jv_makeUtf8Const (char* s, int len)
   if (len < 0)
     len = strlen (s);
   Utf8Const* m = (Utf8Const*) _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
-  if (! m)
-    throw no_memory;
   memcpy (m->data, s, len);
   m->data[len] = 0;
   m->length = len;
@@ -333,33 +331,14 @@ _Jv_ThrowNullPointerException ()
 // The collector calls this when it encounters an out-of-memory condition.
 void _Jv_ThrowNoMemory()
 {
-  _Jv_Throw (no_memory);
+  throw no_memory;
 }
 
-// Allocate a new object of class KLASS.  SIZE is the size of the object
-// to allocate.  You might think this is redundant, but it isn't; some
-// classes, such as String, aren't of fixed size.
-jobject
-_Jv_AllocObject (jclass klass, jint size)
-{
-  _Jv_InitClass (klass);
-
-  jobject obj = (jobject) _Jv_AllocObj (size, klass);
-
-  // If this class has inherited finalize from Object, then don't
-  // bother registering a finalizer.  We know that finalize() is the
-  // very first method after the dummy entry.  If this turns out to be
-  // unreliable, a more robust implementation can be written.  Such an
-  // implementation would look for Object.finalize in Object's method
-  // table at startup, and then use that information to find the
-  // appropriate index in the method vector.
-  if (klass->vtable->get_finalizer()
-      != java::lang::Object::class$.vtable->get_finalizer())
-    _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
-
 #ifdef ENABLE_JVMPI
-  // Service JVMPI request.
-
+static void
+jvmpi_notify_alloc(jclass klass, jint size, jobject obj)
+{
+  // Service JVMPI allocation request.
   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
     {
       JVMPI_Event event;
@@ -384,8 +363,51 @@ _Jv_AllocObject (jclass klass, jint size)
       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
       _Jv_EnableGC ();
     }
+}
+#else /* !ENABLE_JVMPI */
+# define jvmpi_notify_alloc(klass,size,obj) /* do nothing */
 #endif
 
+// Allocate a new object of class KLASS.  SIZE is the size of the object
+// to allocate.  You might think this is redundant, but it isn't; some
+// classes, such as String, aren't of fixed size.
+// First a version that assumes that we have no finalizer, and that
+// the class is already initialized.
+// If we know that JVMPI is disabled, this can be replaced by a direct call
+// to the allocator for the appropriate GC.
+jobject
+_Jv_AllocObjectNoInitNoFinalizer (jclass klass, jint size)
+{
+  jobject obj = (jobject) _Jv_AllocObj (size, klass);
+  jvmpi_notify_alloc (klass, size, obj);
+  return obj;
+}
+
+// And now a version that initializes if necessary.
+jobject
+_Jv_AllocObjectNoFinalizer (jclass klass, jint size)
+{
+  _Jv_InitClass (klass);
+  jobject obj = (jobject) _Jv_AllocObj (size, klass);
+  jvmpi_notify_alloc (klass, size, obj);
+  return obj;
+}
+
+// And now the general version that registers a finalizer if necessary.
+jobject
+_Jv_AllocObject (jclass klass, jint size)
+{
+  jobject obj = _Jv_AllocObjectNoFinalizer (klass, size);
+
+  // We assume that the compiler only generates calls to this routine
+  // if there really is an interesting finalizer.
+  // Unfortunately, we still have to the dynamic test, since there may
+  // be cni calls to this routine.
+  // Nore that on IA64 get_finalizer() returns the starting address of the
+  // function, not a function pointer.  Thus this still works.
+  if (klass->vtable->get_finalizer ()
+      != java::lang::Object::class$.vtable->get_finalizer ())
+    _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
   return obj;
 }