re PR c++/85265 ([concepts] ICE with missing identifier)

/cp
2018-08-29  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/85265
	* parser.c (cp_parser_introduction_list): If cp_parser_identifier
	returns error_mark_node early exit the loop.
	(cp_parser_template_introduction): Improve error-recovery, remove
	error call about empty introduction-list.

/testsuite
2018-08-29  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/85265
	* g++.dg/concepts/pr85265.C: New.

From-SVN: r263966

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 0719186..6ed074e 100644 (file)
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,11 @@
+2018-08-29  Paolo Carlini  <paolo.carlini@oracle.com>
+
+       PR c++/85265
+       * parser.c (cp_parser_introduction_list): If cp_parser_identifier
+       returns error_mark_node early exit the loop.
+       (cp_parser_template_introduction): Improve error-recovery, remove
+       error call about empty introduction-list.
+
 2018-08-29  David Malcolm  <dmalcolm@redhat.com>
 
        PR c++/85110

diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c
index 8291b13..92e6b40 100644 (file)
--- a/gcc/cp/parser.c
+++ b/gcc/cp/parser.c
@@ -15242,11 +15242,15 @@ cp_parser_introduction_list (cp_parser *parser)
       if (is_pack)
        cp_lexer_consume_token (parser->lexer);
 
+      tree identifier = cp_parser_identifier (parser);
+      if (identifier == error_mark_node)
+       break;
+
       /* Build placeholder. */
       tree parm = build_nt (WILDCARD_DECL);
       DECL_SOURCE_LOCATION (parm)
        = cp_lexer_peek_token (parser->lexer)->location;
-      DECL_NAME (parm) = cp_parser_identifier (parser);
+      DECL_NAME (parm) = identifier;
       WILDCARD_PACK_P (parm) = is_pack;
       vec_safe_push (introduction_vec, parm);
 
@@ -27178,18 +27182,18 @@ cp_parser_template_introduction (cp_parser* parser, bool member_p)
      matching identifiers.  */
   tree introduction_list = cp_parser_introduction_list (parser);
 
+  /* Look for closing brace for introduction.  */
+  if (!braces.require_close (parser))
+    return true;
+
   /* The introduction-list shall not be empty.  */
   int nargs = TREE_VEC_LENGTH (introduction_list);
   if (nargs == 0)
     {
-      error ("empty introduction-list");
+      /* In cp_parser_introduction_list we have already issued an error.  */
       return true;
     }
 
-  /* Look for closing brace for introduction.  */
-  if (!braces.require_close (parser))
-    return true;
-
   if (tmpl_decl == error_mark_node)
     {
       cp_parser_name_lookup_error (parser, concept_name, tmpl_decl, NLE_NULL,

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 2011973..78bbd7f 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2018-08-29  Paolo Carlini  <paolo.carlini@oracle.com>
+
+       PR c++/85265
+       * g++.dg/concepts/pr85265.C: New.
+
 2018-08-29  Martin Sebor  <msebor@redhat.com>
            Bernd Edlinger  <bernd.edlinger@hotmail.de>
 

diff --git a/gcc/testsuite/g++.dg/concepts/pr85265.C b/gcc/testsuite/g++.dg/concepts/pr85265.C
new file mode 100644 (file)
index 0000000..86124ce
--- /dev/null
+++ b/gcc/testsuite/g++.dg/concepts/pr85265.C
@@ -0,0 +1,6 @@
+// { dg-do compile { target c++14 } }
+// { dg-additional-options "-fconcepts" }
+
+template<typename> concept bool C = true;
+
+C{} void foo();  // { dg-error "expected identifier" }