c/98200 - improve error recovery for GIMPLE FE

This avoids ICEing by making sure to propagate error early.

2020-12-09  Richard Biener  <rguenther@suse.de>

	PR c/98200
gcc/c/
	* gimple-parser.c (c_parser_gimple_postfix_expression): Return
	early on error.

gcc/testsuite/
	* gcc.dg/gimplefe-error-8.c: New testcase.

diff --git a/gcc/c/gimple-parser.c b/gcc/c/gimple-parser.c
index 5c0ed82..473cb90 100644 (file)
--- a/gcc/c/gimple-parser.c
+++ b/gcc/c/gimple-parser.c
@@ -1700,6 +1700,8 @@ c_parser_gimple_postfix_expression (gimple_parser &parser)
       expr.set_error ();
       break;
     }
+  if (expr.value == error_mark_node)
+    return expr;
   return c_parser_gimple_postfix_expression_after_primary
     (parser, EXPR_LOC_OR_LOC (expr.value, loc), expr);
 }

diff --git a/gcc/testsuite/gcc.dg/gimplefe-error-8.c b/gcc/testsuite/gcc.dg/gimplefe-error-8.c
new file mode 100644 (file)
index 0000000..59e81eb
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/gimplefe-error-8.c
@@ -0,0 +1,9 @@
+/* { dg-do compile } */
+/* { dg-options "-fgimple" } */
+
+int __GIMPLE() f(int x, int y)
+{
+  int a;
+  a = (x < y) ? 1 : 2; /* { dg-error "expected" } */
+  return a;
+}