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[PATCH] PR c++/68795: fix uninitialized close_paren_loc in cp_parser_postfix_expression (v2)


On Thu, 2015-12-17 at 19:21 +0100, Bernd Schmidt wrote:
> On 12/17/2015 07:32 PM, David Malcolm wrote:
> > +             if (close_paren_loc)
> 
> close_paren_loc != UNKNOWN_LOCATION - it's very confusing otherwise.
> 
> 
> Bernd

Here's an updated version; the only change since v1 is:
-           if (close_paren_loc)
+           if (close_paren_loc != UNKNOWN_LOCATION)

Have verified the fix in valgrind.  OK for trunk if it still passes
bootstrap&regrtest?

gcc/cp/ChangeLog:
	* parser.c (cp_parser_postfix_expression): Initialize
	close_paren_loc to UNKNOWN_LOCATION; only use it if
	it has been written to by
	cp_parser_parenthesized_expression_list.
	(cp_parser_postfix_dot_deref_expression): Likewise.
	(cp_parser_parenthesized_expression_list): Document the behavior
	with respect to the CLOSE_PAREN_LOC param.
---
 gcc/cp/parser.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c
index a420cf1..ae61d8a 100644
--- a/gcc/cp/parser.c
+++ b/gcc/cp/parser.c
@@ -6664,7 +6664,7 @@ cp_parser_postfix_expression (cp_parser *parser, bool address_p, bool cast_p,
 	    bool saved_non_integral_constant_expression_p = false;
 	    tsubst_flags_t complain = complain_flags (decltype_p);
 	    vec<tree, va_gc> *args;
-	    location_t close_paren_loc;
+	    location_t close_paren_loc = UNKNOWN_LOCATION;
 
             is_member_access = false;
 
@@ -6826,10 +6826,13 @@ cp_parser_postfix_expression (cp_parser *parser, bool address_p, bool cast_p,
 				    koenig_p,
 				    complain);
 
-	    location_t combined_loc = make_location (token->location,
-						     start_loc,
-						     close_paren_loc);
-	    postfix_expression.set_location (combined_loc);
+	    if (close_paren_loc != UNKNOWN_LOCATION)
+	      {
+		location_t combined_loc = make_location (token->location,
+							 start_loc,
+							 close_paren_loc);
+		postfix_expression.set_location (combined_loc);
+	      }
 
 	    /* The POSTFIX_EXPRESSION is certainly no longer an id.  */
 	    idk = CP_ID_KIND_NONE;
@@ -7298,7 +7301,10 @@ cp_parser_postfix_dot_deref_expression (cp_parser *parser,
    plain identifier argument, normal_attr for an attribute that wants
    an expression, or non_attr if we aren't parsing an attribute list.  If
    NON_CONSTANT_P is non-NULL, *NON_CONSTANT_P indicates whether or
-   not all of the expressions in the list were constant.  */
+   not all of the expressions in the list were constant.
+   If CLOSE_PAREN_LOC is non-NULL, and no errors occur, then *CLOSE_PAREN_LOC
+   will be written to with the location of the closing parenthesis.  If
+   an error occurs, it may or may not be written to.  */
 
 static vec<tree, va_gc> *
 cp_parser_parenthesized_expression_list (cp_parser* parser,
-- 
1.8.5.3


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