(yylex): Avoid invalid shift for erroneous empty char const.

From-SVN: r4292

(yylex): Avoid invalid shift for erroneous empty char const.
From-SVN: r4292
5f0abdc3 · Richard Stallman · c141a106 · 5f0abdc3
Commit 5f0abdc3 authored 31 years ago by Richard Stallman
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Showing with 4 additions and 1 deletions

gcc/c-lex.c
+4 -1

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--- a/gcc/c-lex.c
+++ b/gcc/c-lex.c
@@ -1847,7 +1847,10 @@ yylex ()
 	if (! wide_flag)
 	  {
 	    int num_bits = num_chars * width;
-	    if (TREE_UNSIGNED (char_type_node)
+	    if (num_bits == 0)
+	      /* We already got an error; avoid invalid shift.  */
+	      yylval.ttype = build_int_2 (0, 0);
+	    else if (TREE_UNSIGNED (char_type_node)
 		     || ((result >> (num_bits - 1)) & 1) == 0)
 	      yylval.ttype
 		= build_int_2 (result & ((unsigned HOST_WIDE_INT) ~0