re PR libgcj/21906 (hang when invoking abstract method)

gcc/java/:
	PR libgcj/21906:
	* class.c (make_method_value): Use soft_abstractmethod_node for
	abstract method.
	* java-tree.h (soft_abstractmethod_node): New define.
	(JTI_SOFT_ABSTRACTMETHOD_NODE): New enum constant.
	* decl.c (java_init_decl_processing): Initialize
	soft_abstractmethod_node.
libjava/:
	PR libgcj/21906:
	* defineclass.cc (handleMethodsEnd): Set ncode for abstract
	methods.
	* include/jvm.h (_Jv_ThrowAbstractMethodError): Declare.
	* link.cc (_Jv_ThrowAbstractMethodError): Renamed.  No longer
	static.
	(append_partial_itable): Use it.
	(set_vtable_entries): Likewise.

From-SVN: r100992

gcc/java/ChangeLog

@@ -1,3 +1,13 @@
+2005-06-15  Tom Tromey  <tromey@redhat.com>
+
+	PR libgcj/21906:
+	* class.c (make_method_value): Use soft_abstractmethod_node for
+	abstract method.
+	* java-tree.h (soft_abstractmethod_node): New define.
+	(JTI_SOFT_ABSTRACTMETHOD_NODE): New enum constant.
+	* decl.c (java_init_decl_processing): Initialize
+	soft_abstractmethod_node.
+
 2005-06-13  Geoffrey Keating  <geoffk@apple.com>
 
 	* Make-lang.in (rule for installing gcj.1): Depends on installdirs.

gcc/java/class.c

@@ -1315,7 +1315,10 @@ make_method_value (tree mdecl)
     index = integer_minus_one_node;
 
   code = null_pointer_node;
-  if (!METHOD_ABSTRACT (mdecl))
+  if (METHOD_ABSTRACT (mdecl))
+    code = build1 (ADDR_EXPR, nativecode_ptr_type_node,
+		   soft_abstractmethod_node);
+  else
     code = build1 (ADDR_EXPR, nativecode_ptr_type_node, 
 		   make_local_function_alias (mdecl));
   START_RECORD_CONSTRUCTOR (minit, method_type_node);

gcc/java/decl.c

@@ -1107,6 +1107,15 @@ java_init_decl_processing (void)
   TREE_THIS_VOLATILE (soft_nullpointer_node) = 1;
   TREE_SIDE_EFFECTS (soft_nullpointer_node) = 1;
 
+  soft_abstractmethod_node
+    = builtin_function ("_Jv_ThrowAbstractMethodError",
+			build_function_type (void_type_node, endlink),
+			0, NOT_BUILT_IN, NULL, NULL_TREE);
+  /* Mark soft_abstractmethod_node as a `noreturn' function with side
+     effects.  */
+  TREE_THIS_VOLATILE (soft_abstractmethod_node) = 1;
+  TREE_SIDE_EFFECTS (soft_abstractmethod_node) = 1;
+
   t = tree_cons (NULL_TREE, class_ptr_type,
 		 tree_cons (NULL_TREE, object_ptr_type_node, endlink));
   soft_checkcast_node

gcc/java/java-tree.h

@@ -392,6 +392,7 @@ enum java_tree_index
   JTI_SOFT_MULTIANEWARRAY_NODE,
   JTI_SOFT_BADARRAYINDEX_NODE,
   JTI_SOFT_NULLPOINTER_NODE,
+  JTI_SOFT_ABSTRACTMETHOD_NODE,
   JTI_SOFT_CHECKARRAYSTORE_NODE,
   JTI_SOFT_MONITORENTER_NODE,
   JTI_SOFT_MONITOREXIT_NODE,
@@ -651,6 +652,8 @@ extern GTY(()) tree java_global_trees[JTI_MAX];
   java_global_trees[JTI_SOFT_BADARRAYINDEX_NODE]
 #define soft_nullpointer_node \
   java_global_trees[JTI_SOFT_NULLPOINTER_NODE]
+#define soft_abstractmethod_node \
+  java_global_trees[JTI_SOFT_ABSTRACTMETHOD_NODE]
 #define soft_checkarraystore_node \
   java_global_trees[JTI_SOFT_CHECKARRAYSTORE_NODE]
 #define soft_monitorenter_node \

libjava/ChangeLog

@@ -1,3 +1,14 @@
+2005-06-15  Tom Tromey  <tromey@redhat.com>
+
+	PR libgcj/21906:
+	* defineclass.cc (handleMethodsEnd): Set ncode for abstract
+	methods.
+	* include/jvm.h (_Jv_ThrowAbstractMethodError): Declare.
+	* link.cc (_Jv_ThrowAbstractMethodError): Renamed.  No longer
+	static.
+	(append_partial_itable): Use it.
+	(set_vtable_entries): Likewise.
+
 2005-06-15  Tom Tromey  <tromey@redhat.com>
 
 	* gnu/gcj/runtime/SystemClassLoader.java (init): Clear

libjava/defineclass.cc

@@ -1288,7 +1288,7 @@ void _Jv_ClassReader::handleMethod
 	throw_class_format_error ("erroneous method access flags");
 
       // FIXME: JVM spec S4.6: if ABSTRACT modifier is set, verify other 
-      // flags are not set. Verify flags for interface methods. Verifiy
+      // flags are not set. Verify flags for interface methods.  Verify
       // modifiers for initializers. 
     }
 }
@@ -1378,6 +1378,7 @@ void _Jv_ClassReader::handleMethodsEnd ()
 	{
 	  if (def_interp->interpreted_methods[i] != 0)
 	    throw_class_format_error ("code provided for abstract method");
+	  method->ncode = (void *) &_Jv_ThrowAbstractMethodError;
 	}
       else
 	{

libjava/include/jvm.h

@@ -482,6 +482,8 @@ extern void _Jv_CallAnyMethodA (jobject obj,
 extern jobject _Jv_NewMultiArray (jclass, jint ndims, jint* dims)
   __attribute__((__malloc__));
 
+extern "C" void _Jv_ThrowAbstractMethodError () __attribute__((__noreturn__));
+
 /* Checked divide subroutines. */
 extern "C"
 {

libjava/link.cc

@@ -714,8 +714,8 @@ _Jv_ThrowNoSuchMethodError ()
 }
 
 // This is put in empty vtable slots.
-static void
-_Jv_abstractMethodError (void)
+void
+_Jv_ThrowAbstractMethodError ()
 {
   throw new java::lang::AbstractMethodError();
 }
@@ -767,7 +767,7 @@ _Jv_Linker::append_partial_itable (jclass klass, jclass iface,
 	      (_Jv_GetMethodString (klass, meth));
 
  	  if ((meth->accflags & Modifier::ABSTRACT) != 0)
-	    itable[pos] = (void *) &_Jv_abstractMethodError;
+	    itable[pos] = (void *) &_Jv_ThrowAbstractMethodError;
 	  else
 	    itable[pos] = meth->ncode;
 	}
@@ -1228,7 +1228,8 @@ _Jv_Linker::set_vtable_entries (jclass klass, _Jv_VTable *vtable)
       if ((meth->accflags & Modifier::ABSTRACT))
 	// FIXME: it might be nice to have a libffi trampoline here,
 	// so we could pass in the method name and other information.
-	vtable->set_method(meth->index, (void *) &_Jv_abstractMethodError);
+	vtable->set_method(meth->index,
+			   (void *) &_Jv_ThrowAbstractMethodError);
       else
 	vtable->set_method(meth->index, meth->ncode);
     }