boehm.c (mark_reference_fields): Don't mark RawData fields.

	* boehm.c (mark_reference_fields): Don't mark RawData fields.
	Keep track of when we've seen a reference field after a
	non-reference field.
	(get_boehm_type_descriptor): Handle case where we see
	non-reference fields but no trailing reference field.
	* decl.c (rawdata_ptr_type_node): Define.
	(init_decl_processing): Initialize rawdata_ptr_type_node.
	* java-tree.h (rawdata_ptr_type_node): Declare.

From-SVN: r33701

gcc/java/ChangeLog

+2000-05-04  Tom Tromey  <tromey@cygnus.com>
+
+	* boehm.c (mark_reference_fields): Don't mark RawData fields.
+	Keep track of when we've seen a reference field after a
+	non-reference field.
+	(get_boehm_type_descriptor): Handle case where we see
+	non-reference fields but no trailing reference field.
+	* decl.c (rawdata_ptr_type_node): Define.
+	(init_decl_processing): Initialize rawdata_ptr_type_node.
+	* java-tree.h (rawdata_ptr_type_node): Declare.
+
 2000-05-04  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
 
 	* jcf-dump.c (SPECIAL_IINC): Ensure arguments match format
@@ -14,11 +25,6 @@
 	* gjavah.c (decode_signature_piece): Don't treat `$' as namespace
 	separator.
 
-2000-05-02  Tom Tromey  <tromey@cygnus.com>
-
-	* expr.c (build_jni_stub): Cache the result of
-	_Jv_LookupJNIMethod.
-
 2000-04-19  Tom Tromey  <tromey@cygnus.com>
 
 	* class.c (add_method_1): Set both DECL_EXTERNAL and METHOD_NATIVE

gcc/java/boehm.c

@@ -100,7 +100,10 @@ mark_reference_fields (field, low, high, ubit,
 	continue;
 
       offset = int_byte_position (field);
-      if (JREFERENCE_TYPE_P (TREE_TYPE (field)))
+      if (JREFERENCE_TYPE_P (TREE_TYPE (field))
+	  /* An `object' of type gnu.gcj.RawData is actually non-Java
+	     data.  */
+	  && TREE_TYPE (field) != rawdata_ptr_type_node)
 	{
 	  unsigned int count;
 
@@ -117,8 +120,14 @@ mark_reference_fields (field, low, high, ubit,
 	  set_bit (low, high, ubit - count - 1);
 	  if (count > ubit - 2)
 	    *pointer_after_end = 1;
+
+	  /* If we saw a non-reference field earlier, then we can't
+	     use the count representation.  We keep track of that in
+	     *ALL_BITS_SET.  */
+	  if (! *all_bits_set)
+	    *all_bits_set = -1;
 	}
-      else
+      else if (*all_bits_set > 0)
 	*all_bits_set = 0;
 
       *last_view_index = offset;
@@ -172,9 +181,13 @@ get_boehm_type_descriptor (tree type)
   /* If the object is all pointers, or if the part with pointers fits
      in our bitmap, then we are ok.  Otherwise we have to allocate it
      a different way.  */
-  if (all_bits_set)
+  if (all_bits_set != -1)
     {
-      /* In the GC the computation looks something like this:
+      /* In this case the initial part of the object is all reference
+	 fields, and the end of the object is all non-reference
+	 fields.  We represent the mark as a count of the fields,
+	 shifted.  In the GC the computation looks something like
+	 this:
 	 value = DS_LENGTH | WORDS_TO_BYTES (last_set_index + 1);
 	 DS_LENGTH is 0.
 	 WORDS_TO_BYTES shifts by log2(bytes-per-pointer).  */

gcc/java/decl.c

@@ -295,6 +295,7 @@ tree string_ptr_type_node;
 tree throwable_type_node;
 tree runtime_exception_type_node;
 tree error_exception_type_node;
+tree rawdata_ptr_type_node;
 tree *predef_filenames;
 int  predef_filenames_size;
 
@@ -586,6 +587,8 @@ init_decl_processing ()
     lookup_class (get_identifier ("java.lang.RuntimeException"));
   error_exception_type_node = 
     lookup_class (get_identifier ("java.lang.Error"));
+  rawdata_ptr_type_node
+    = promote_type (lookup_class (get_identifier ("gnu.gcj.RawData")));
 
   /* This section has to be updated as items are added to the previous
      section. */

gcc/java/java-tree.h

@@ -225,6 +225,7 @@ extern tree string_ptr_type_node;
 extern tree throwable_type_node;
 extern tree runtime_exception_type_node;
 extern tree error_exception_type_node;
+extern tree rawdata_ptr_type_node;
 
 extern tree *predef_filenames;
 extern int predef_filenames_size;