This adjusts equate handling by

- allowing true forward references (which will always assume the referenced
  symbols have at the point of use) through the new .eqv pseudo-op and the
  new == operator
- disallowing changing .equiv-generated equates (so that the protection this
  provides is both forward and backward)
- snapshotting equates when their value gets changed so that previous uses
  don't get affected by the new value.
- allowing expressions in places where absolute expressions (or register
  names) are needed which were not completely resolvable at the point of
  their definition but which are fully resolvable at the point of use

In addition it fixes PR/288.

1 files changed, 13 insertions, 2 deletions

diff --git a/gas/expr.h b/gas/expr.h
index ddd1ce3ac3..6b88d0dfe4 100644
--- a/gas/expr.h
+++ b/gas/expr.h
@@ -143,8 +143,17 @@ typedef struct expressionS {
   unsigned short X_md;
 } expressionS;
 
+enum expr_mode
+{
+  expr_evaluate,
+  expr_normal,
+  expr_defer
+};
+
 /* "result" should be type (expressionS *).  */
-#define expression(result) expr (0, result)
+#define expression(result) expr (0, result, expr_normal)
+#define expression_and_evaluate(result) expr (0, result, expr_evaluate)
+#define deferred_expression(result) expr (0, result, expr_defer)
 
 /* If an expression is O_big, look here for its value. These common
    data may be clobbered whenever expr() is called.  */
@@ -160,10 +169,12 @@ typedef char operator_rankT;
 extern char get_symbol_end (void);
 extern void expr_begin (void);
 extern void expr_set_precedence (void);
-extern segT expr (int rank, expressionS * resultP);
+extern segT expr (int, expressionS *, enum expr_mode);
 extern unsigned int get_single_number (void);
 extern symbolS *make_expr_symbol (expressionS * expressionP);
 extern int expr_symbol_where (symbolS *, char **, unsigned int *);
 
 extern symbolS *expr_build_uconstant (offsetT);
 extern symbolS *expr_build_dot (void);
+
+int resolve_expression (expressionS *);