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(* *********************************************************************)
(* *)
(* 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. *)
(* *)
(* *********************************************************************)
(** Pseudo-registers and register states.
This library defines the type of pseudo-registers (also known as
"temporaries" in compiler literature) used in the RTL
intermediate language. We also define finite sets and finite maps
over pseudo-registers. *)
Require Import Coqlib.
Require Import AST.
Require Import Maps.
Require Import Ordered.
Require FSetAVL.
Definition reg: Type := positive.
Module Reg.
Definition eq := peq.
Definition typenv := PMap.t typ.
End Reg.
(** Mappings from registers to some type. *)
Module Regmap := PMap.
Set Implicit Arguments.
Definition regmap_optget
(A: Type) (or: option reg) (dfl: A) (rs: Regmap.t A) : A :=
match or with
| None => dfl
| Some r => Regmap.get r rs
end.
Definition regmap_optset
(A: Type) (or: option reg) (v: A) (rs: Regmap.t A) : Regmap.t A :=
match or with
| None => rs
| Some r => Regmap.set r v rs
end.
Notation "a # b" := (Regmap.get b a) (at level 1).
Notation "a ## b" := (List.map (fun r => Regmap.get r a) b) (at level 1).
Notation "a # b <- c" := (Regmap.set b c a) (at level 1, b at next level).
(** Sets of registers *)
Module Regset := FSetAVL.Make(OrderedPositive).
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