cp-tree.def: Add SRCLOC.

* cp-tree.def: Add SRCLOC.
	* cp-tree.h: Add struct tree_srcloc and accessor macros.
	* tree.c (build_srcloc, build_srcloc_here): New fns.
	* pt.c (add_pending_template): Use build_srcloc_here.
	(push_tinst_level): Update last_template_error_tick before erroring.
	(instantiate_decl): Restore lineno and input_filename before
	calling add_pending_template.
	* decl2.c (finish_file): Set up lineno and input_filename for
	pending templates.

From-SVN: r19967

gcc/cp/ChangeLog

@@ -1,3 +1,15 @@
+1998-05-23  Jason Merrill  <jason@yorick.cygnus.com>
+
+	* cp-tree.def: Add SRCLOC.
+	* cp-tree.h: Add struct tree_srcloc and accessor macros.
+	* tree.c (build_srcloc, build_srcloc_here): New fns.
+	* pt.c (add_pending_template): Use build_srcloc_here.
+	(push_tinst_level): Update last_template_error_tick before erroring.
+	(instantiate_decl): Restore lineno and input_filename before 
+	calling add_pending_template.
+	* decl2.c (finish_file): Set up lineno and input_filename for
+	pending templates.
+
 1998-05-22  Jason Merrill  <jason@yorick.cygnus.com>
 
 	* decl.c (lang_print_error_function): New fn.  

gcc/cp/cp-tree.def

@@ -179,6 +179,9 @@ DEFTREECODE (OVERLOAD, "overload", 'x', 1)
    tree structure.  */
 DEFTREECODE (WRAPPER, "wrapper", 'x', 1)
 
+/* A node to remember a source position.  */
+DEFTREECODE (SRCLOC, "srcloc", 'x', 2)
+
 /* A whole bunch of tree codes for the initial, superficial parsing of
    templates.  */
 DEFTREECODE (LOOKUP_EXPR, "lookup_expr", 'e', 2)

gcc/cp/cp-tree.h

@@ -166,6 +166,15 @@ struct tree_wrapper
   } u;
 };
 
+#define SRCLOC_FILE(NODE) (((struct tree_srcloc*)NODE)->filename)
+#define SRCLOC_LINE(NODE) (((struct tree_srcloc*)NODE)->linenum)
+struct tree_srcloc
+{
+  char common[sizeof (struct tree_common)];
+  char *filename;
+  int linenum;
+};
+
 /* To identify to the debug emitters if it should pay attention to the
    flag `-Wtemplate-debugging'.  */
 #define HAVE_TEMPLATES 1
@@ -2823,6 +2832,8 @@ extern tree make_temp_vec			PROTO((int));
 extern tree build_ptr_wrapper			PROTO((void *));
 extern tree build_expr_ptr_wrapper		PROTO((void *));
 extern tree build_int_wrapper			PROTO((int));
+extern tree build_srcloc			PROTO((char *, int));
+extern tree build_srcloc_here			PROTO((void));
 extern int varargs_function_p			PROTO((tree));
 extern int really_overloaded_fn			PROTO((tree));
 extern int cp_tree_equal			PROTO((tree, tree));

gcc/cp/decl2.c

@@ -3086,7 +3086,12 @@ finish_file ()
 
   for (fnname = pending_templates; fnname; fnname = TREE_CHAIN (fnname))
     {
+      tree srcloc = TREE_PURPOSE (fnname);
       tree decl = TREE_VALUE (fnname);
+
+      input_filename = SRCLOC_FILE (srcloc);
+      lineno = SRCLOC_LINE (srcloc);
+
       if (TREE_CODE_CLASS (TREE_CODE (decl)) == 't')
 	{
 	  instantiate_class_template (decl);

gcc/cp/pt.c

@@ -2775,7 +2775,7 @@ add_pending_template (d)
     return;
 
   *template_tail = perm_tree_cons
-    (current_function_decl, d, NULL_TREE);
+    (build_srcloc_here (), d, NULL_TREE);
   template_tail = &TREE_CHAIN (*template_tail);
   TI_PENDING_TEMPLATE_FLAG (ti) = 1;
 }
@@ -3346,8 +3346,8 @@ print_template_context (err)
       if (current_function_decl == p->decl)
 	/* Avoid redundancy with the the "In function" line.  */;
       else if (current_function_decl == NULL_TREE)
-	fprintf (stderr, "In instantiation of `%s':\n",
-		 decl_as_string (p->decl, 0));
+	fprintf (stderr, "%s: In instantiation of `%s':\n",
+		 file, decl_as_string (p->decl, 0));
       else
 	my_friendly_abort (980521);
 
@@ -3397,6 +3397,7 @@ push_tinst_level (d)
       if (uses_template_parms (d))
 	return 0;
 
+      last_template_error_tick = tinst_level_tick;
       error ("template instantiation depth exceeds maximum of %d",
 	     max_tinst_depth);
       error (" (use -ftemplate-depth-NN to increase the maximum)");
@@ -7127,6 +7128,9 @@ instantiate_decl (d)
       || (! (TREE_CODE (d) == FUNCTION_DECL && DECL_INLINE (d) && nested)
 	  && ! at_eof))
     {
+      lineno = line;
+      input_filename = file;
+
       add_pending_template (d);
       goto out;
     }

gcc/cp/tree.c

@@ -2267,6 +2267,23 @@ build_int_wrapper (i)
   return t;
 }
 
+tree
+build_srcloc (file, line)
+     char *file;
+     int line;
+{
+  tree t = make_node (SRCLOC);
+  SRCLOC_FILE (t) = file;
+  SRCLOC_LINE (t) = line;
+  return t;
+}
+
+tree
+build_srcloc_here ()
+{
+  return build_srcloc (input_filename, lineno);
+}
+
 void
 push_expression_obstack ()
 {