gdb/

	Fix crashes on dangling display expressions.
	* ada-lang.c (ada_operator_check): New function.
	(ada_exp_descriptor): Fill-in the field operator_check.
	* c-lang.c (exp_descriptor_c): Fill-in the field operator_check.
	* jv-lang.c (exp_descriptor_java): Likewise.
	* m2-lang.c (exp_descriptor_modula2): Likewise.
	* scm-lang.c (exp_descriptor_scm): Likewise.
	* parse.c (exp_descriptor_standard): Likewise.
	(operator_check_standard): New function.
	(exp_iterate, exp_uses_objfile_iter, exp_uses_objfile): New functions.
	* parser-defs.h (struct exp_descriptor): New field operator_check.
	(operator_check_standard, exp_uses_objfile): New declarations.
	* printcmd.c: Remove the inclusion of solib.h.
	(display_uses_solib_p): Remove the function.
	(clear_dangling_display_expressions): Call lookup_objfile_from_block
	and exp_uses_objfile instead of display_uses_solib_p.
	* solist.h (struct so_list) <objfile>: New comment.
	* symtab.c (lookup_objfile_from_block): Remove the static qualifier.
	* symtab.h (lookup_objfile_from_block): New declaration.
	(struct general_symbol_info) <obj_section>: Extend the comment.

gdb/testsuite/
	Fix crashes on dangling display expressions.
	* gdb.base/solib-display.exp: Call gdb_gnu_strip_debug if LIBSEPDEBUG
	is SEP.
	(lib_flags): Remove the "debug" keyword.
	(libsepdebug): New variable for iterating new loop.
	(save_pf_prefix): New variable wrapping the loop.
	(sep_lib_flags): New variable derived from LIB_FLAGS.  Use it.
	* lib/gdb.exp (gdb_gnu_strip_debug): Document the return code.

1 files changed, 20 insertions, 0 deletions

diff --git a/gdb/parser-defs.h b/gdb/parser-defs.h
index c4eb1a0..a37bbca 100644
--- a/gdb/parser-defs.h
+++ b/gdb/parser-defs.h
@@ -192,6 +192,11 @@ extern void operator_length (struct expression *, int, int *, int *);
 
 extern void operator_length_standard (struct expression *, int, int *, int *);
 
+extern int operator_check_standard (struct expression *exp, int pos,
+				    int (*objfile_func)
+				      (struct objfile *objfile, void *data),
+				    void *data);
+
 extern char *op_name_standard (enum exp_opcode);
 
 extern struct type *follow_types (struct type *);
@@ -270,6 +275,19 @@ struct exp_descriptor
        the number of subexpressions it takes.  */
     void (*operator_length) (struct expression*, int, int*, int *);
 
+    /* Call TYPE_FUNC and OBJFILE_FUNC for any TYPE and OBJFILE found being
+       referenced by the single operator of EXP at position POS.  Operator
+       parameters are located at positive (POS + number) offsets in EXP.
+       The functions should never be called with NULL TYPE or NULL OBJFILE.
+       Functions should get passed an arbitrary caller supplied DATA pointer.
+       If any of the functions returns non-zero value then (any other) non-zero
+       value should be immediately returned to the caller.  Otherwise zero
+       should be returned.  */
+    int (*operator_check) (struct expression *exp, int pos,
+			   int (*objfile_func) (struct objfile *objfile,
+						void *data),
+			   void *data);
+
     /* Name of this operator for dumping purposes.  */
     char *(*op_name) (enum exp_opcode);
 
@@ -302,4 +320,6 @@ extern void print_subexp_standard (struct expression *, int *,
 
 extern void parser_fprintf (FILE *, const char *, ...) ATTR_FORMAT (printf, 2 ,3);
 
+extern int exp_uses_objfile (struct expression *exp, struct objfile *objfile);
+
 #endif /* PARSER_DEFS_H */