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(*
* Vericert: Verified high-level synthesis.
* Copyright (C) 2020 Yann Herklotz <yann@yannherklotz.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*)
open Printf
open Clflags
open Camlcoq
open Datatypes
open Coqlib
open Maps
open AST
open Kildall
open Op
open RTLBlock
(* Assuming that the nodes of the CFG [code] are numbered in reverse postorder (cf. pass
[Renumber]), an edge from [n] to [s] is a normal edge if [s < n] and a back-edge otherwise. *)
let find_backedge i n =
let succ = RTL.successors_instr i in
List.filter (fun s -> P.lt n s) succ
let find_backedges c =
let prepend_instr i = function
| {bb_body = bb; bb_exit = e} -> {bb_body = (i :: bb); bb_exit = e}
let rec bblock_from_RTL (c : RTL.code) i =
let succ = List.map (fun i -> PTree.get i c) (RTL.successors_instr i) in
match i, succ with
| RTL.Inop _, Some i::[] -> begin
match bblock_from_RTL c i with
| Errors.OK bb -> Errors.OK (prepend_instr RBnop bb)
| Errors.Error msg -> Errors.Error msg
end
| RTL.Iop (op, rs, dst, _), Some i::[] -> begin
match bblock_from_RTL c i with
| Errors.OK bb
end
(* Partition a function and transform it into RTLBlock. *)
let function_from_RTL f =
{ fn_sig = f.RTL.fn_entrypoint;
fn_stacksize = f.RTL.fn_stacksize;
fn_entrypoint = f.RTL.fn_entrypoint;
fn_code = f.RTL.fn_code
}
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