From b585bc2c0ac716d16d6db3bdfe9f4524de1d7149 Mon Sep 17 00:00:00 2001
From: Richard Henderson <rth@redhat.com>
Date: Thu, 3 Jun 1999 02:51:27 +0000
Subject: [PATCH]         * expr.c (operand): Don't use [ for parens if we want
 an index op.         (op_encoding): Switch [ into O_index, if desired.       
  (op_rank): Renumber with O_index on bottom.         (expr): If O_index,
 match closing bracket.         * expr.h (O_index): New.

---
 gas/expr.c | 66 +++++++++++++++++++++++++++++++++++-------------------
 gas/expr.h |  2 ++
 2 files changed, 45 insertions(+), 23 deletions(-)

diff --git a/gas/expr.c b/gas/expr.c
index 9cfec2e655f..6e74bfa1daa 100644
--- a/gas/expr.c
+++ b/gas/expr.c
@@ -989,7 +989,9 @@ operand (expressionP)
       break;
 
     case '(':
+#ifndef NEED_INDEX_OPERATOR
     case '[':
+#endif
       /* didn't begin with digit & not a name */
       segment = expression (expressionP);
       /* Expression() will pass trailing whitespace */
@@ -1415,7 +1417,13 @@ static const operatorT op_encoding[256] =
   __, __, __, __, __, __, __, __,
   __, __, __, __, __, __, __, __,
   __, __, __, __, __, __, __, __,
-  __, __, __, __, __, __, O_bit_exclusive_or, __,
+  __, __, __,
+#ifdef NEED_INDEX_OPERATOR
+  O_index,
+#else
+  __,
+#endif
+  __, __, O_bit_exclusive_or, __,
   __, __, __, __, __, __, __, __,
   __, __, __, __, __, __, __, __,
   __, __, __, __, __, __, __, __,
@@ -1453,28 +1461,29 @@ static operator_rankT op_rank[] =
   0,	/* O_symbol_rva */
   0,	/* O_register */
   0,	/* O_bit */
-  8,	/* O_uminus */
-  8,	/* O_bit_not */
-  8,	/* O_logical_not */
-  7,	/* O_multiply */
-  7,	/* O_divide */
-  7,	/* O_modulus */
-  7,	/* O_left_shift */
-  7,	/* O_right_shift */
-  6,	/* O_bit_inclusive_or */
-  6,	/* O_bit_or_not */
-  6,	/* O_bit_exclusive_or */
-  6,	/* O_bit_and */
-  4,	/* O_add */
-  4,	/* O_subtract */
-  3,	/* O_eq */
-  3,	/* O_ne */
-  3,	/* O_lt */
-  3,	/* O_le */
-  3,	/* O_ge */
-  3,	/* O_gt */
-  2,	/* O_logical_and */
-  1	/* O_logical_or */
+  9,	/* O_uminus */
+  9,	/* O_bit_not */
+  9,	/* O_logical_not */
+  8,	/* O_multiply */
+  8,	/* O_divide */
+  8,	/* O_modulus */
+  8,	/* O_left_shift */
+  8,	/* O_right_shift */
+  7,	/* O_bit_inclusive_or */
+  7,	/* O_bit_or_not */
+  7,	/* O_bit_exclusive_or */
+  7,	/* O_bit_and */
+  5,	/* O_add */
+  5,	/* O_subtract */
+  4,	/* O_eq */
+  4,	/* O_ne */
+  4,	/* O_lt */
+  4,	/* O_le */
+  4,	/* O_ge */
+  4,	/* O_gt */
+  3,	/* O_logical_and */
+  2,	/* O_logical_or */
+  1,	/* O_index */
 };
 
 /* Unfortunately, in MRI mode for the m68k, multiplication and
@@ -1641,6 +1650,17 @@ expr (rank, resultP)
 
       know (*input_line_pointer != ' ');
 
+      if (op_left == O_index)
+	{
+	  if (*input_line_pointer != ']')
+	    as_bad ("missing right bracket");
+	  else
+	    {
+	      ++input_line_pointer;
+	      SKIP_WHITESPACE ();
+	    }
+	}
+
       if (retval == undefined_section)
 	{
 	  if (SEG_NORMAL (rightseg))
diff --git a/gas/expr.h b/gas/expr.h
index cdf337a811c..14a2fd27202 100644
--- a/gas/expr.h
+++ b/gas/expr.h
@@ -102,6 +102,8 @@ typedef enum
   O_logical_and,
   /* (X_add_symbol || X_op_symbol) + X_add_number.  */
   O_logical_or,
+  /* X_op_symbol [ X_add_symbol ] */
+  O_index,
   /* this must be the largest value */
   O_max
 } operatorT;
-- 
2.30.2