PATCH for global register error message

[Andrew Haley]

This patch moves the error checking for global register variables from
varasm to regclass.  The reason for this is that the C++ front end may
define some functions before parsing any source, thus making it
impossible to declare any global register variables; better to defer
the checking until registers are allocated.

Andrew.

Fri Oct 22 14:30:30 1999  Andrew Haley  <aph@cygnus.com>

	* varasm.c (function_defined): Remove.
	(make_function_rtl): Don't set function_defined.
	(make_decl_rtl): Remove global register warning.
	* regclass.c (no_global_reg_vars): New variable.
	(globalize_reg): Warn if function has already been defined.
	(regclass_init): Set no_global_reg_vars.

Index: varasm.c
===================================================================
RCS file: /cvs/gcc/egcs/gcc/varasm.c,v
retrieving revision 1.84
diff -p -r1.84 varasm.c
*** varasm.c	1999/10/03 16:47:52	1.84
--- varasm.c	1999/10/22 13:23:58
*************** int size_directive_output;
*** 149,158 ****
  
  tree last_assemble_variable_decl;
  
- /* Nonzero if at least one function definition has been seen.  */
- 
- static int function_defined;
- 
  static const char *strip_reg_name	PROTO((const char *));
  static int contains_pointers_p		PROTO((tree));
  static void decode_addr_const		PROTO((tree, struct addr_const *));
--- 149,154 ----
*************** make_function_rtl (decl)
*** 579,587 ****
  	ENCODE_SECTION_INFO (decl);
  #endif
      }
- 
-   /* Record at least one function has been defined.  */
-   function_defined = 1;
  }
  
  /* Given NAME, a putative register name, discard any customary prefixes.  */
--- 575,580 ----
*************** make_decl_rtl (decl, asmspec, top_level)
*** 729,737 ****
  	      DECL_INITIAL (decl) = 0;
  	      error ("global register variable has initial value");
  	    }
- 	  if (fixed_regs[reg_number] == 0
- 	      && function_defined && top_level)
- 	    error ("global register variable follows a function definition");
  	  if (TREE_THIS_VOLATILE (decl))
  	    warning ("volatile register variables don't work as you might wish");
  
--- 722,727 ----
Index: regclass.c
===================================================================
RCS file: /cvs/gcc/egcs/gcc/regclass.c,v
retrieving revision 1.63
diff -p -r1.63 regclass.c
*** regclass.c	1999/10/01 10:00:25	1.63
--- regclass.c	1999/10/22 13:23:59
*************** struct reg_info_data {
*** 213,219 ****
--- 213,224 ----
  
  static struct reg_info_data *reg_info_head;
  
+ /* No more global register vairiables may be declared; true once
+    regclass has been initialized. */
  
+ static int no_global_reg_vars = 0;
+ 
+ 
  /* Function called only once to initialize the above data on reg usage.
     Once this is done, various switches may override.  */
  
*************** void
*** 615,620 ****
--- 620,628 ----
  globalize_reg (i)
       int i;
  {
+   if (no_global_reg_vars)
+     error ("global register variable follows a function definition");
+ 
    if (global_regs[i])
      {
        warning ("register used for two global register variables");
*************** regclass_init ()
*** 743,748 ****
--- 751,759 ----
    /* This prevents dump_flow_info from losing if called
       before regclass is run.  */
    prefclass = 0;
+ 
+   /* No more global register vairiables may be declared. */
+   no_global_reg_vars = 1;
  }
  
  /* Subroutine of regclass, processes one insn INSN.  Scan it and record each