(* *********************************************************************)
(*                                                                     *)
(*              The Compcert verified compiler                         *)
(*                                                                     *)
(*          Xavier Leroy, INRIA Paris-Rocquencourt                     *)
(*                                                                     *)
(*  Copyright Institut National de Recherche en Informatique et en     *)
(*  Automatique.  All rights reserved.  This file is distributed       *)
(*  under the terms of the INRIA Non-Commercial License Agreement.     *)
(*                                                                     *)
(* *********************************************************************)

(** Auxiliary functions on machine registers *)

open Machregs

let register_names = [
  ("R3", R3);  ("R4", R4);  ("R5", R5);  ("R6", R6);
  ("R7", R7);  ("R8", R8);  ("R9", R9);  ("R10", R10);
  ("R11", R11); ("R12", R12);
  ("R14", R14); ("R15", R15); ("R16", R16);
  ("R17", R17); ("R18", R18); ("R19", R19); ("R20", R20);
  ("R21", R21); ("R22", R22); ("R23", R23); ("R24", R24);
  ("R25", R25); ("R26", R26); ("R27", R27); ("R28", R28);
  ("R29", R29); ("R30", R30); ("R31", R31);
  ("F0", F0); ("F1", F1);  ("F2", F2);  ("F3", F3);  ("F4", F4);
  ("F5", F5);  ("F6", F6);  ("F7", F7);  ("F8", F8);
  ("F9", F9);  ("F10", F10); ("F11", F11); ("F12", F12);
  ("F13", F13); ("F14", F14); ("F15", F15);
  ("F16", F16); ("F17", F17); ("F18", F18); ("F19", F19);
  ("F20", F20); ("F21", F21); ("F22", F22); ("F23", F23);
  ("F24", F24); ("F25", F25); ("F26", F26); ("F27", F27);
  ("F28", F28); ("F29", F29); ("F30", F30); ("F31", F31)
]

let name_of_register r =
  let rec rev_assoc = function
  | [] -> None
  | (a, b) :: rem -> if b = r then Some a else rev_assoc rem
  in rev_assoc register_names

let register_by_name s =
  try
    Some(List.assoc (String.uppercase s) register_names)
  with Not_found ->
    None

let can_reserve_register r =
  List.mem r Conventions1.int_callee_save_regs
  || List.mem r Conventions1.float_callee_save_regs