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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. *)
(* *)
(* *********************************************************************)
open AST
open Datatypes
open FSetAVL
open Maps
open Op
open Ordered
open! RTL
module PSet = Make(OrderedPositive)
type inlining_info = {
call_cnt : int PTree.t; (* Count the number of direct calls to a function *)
addr_taken : PSet.t; (* The set of globals which have their address taken *)
}
let empty_inlining_info = {
call_cnt = PTree.empty;
addr_taken = PSet.empty;
}
let call_count id io =
match PTree.get id io.call_cnt with
| Some cnt -> cnt
| None -> 0
let called id io =
let call_cnt = PTree.set id (1 + call_count id io) io.call_cnt in
{ io with call_cnt = call_cnt }
let address_taken id io =
PSet.mem id io.addr_taken
let rec used_id io ids =
match ids with
| [] -> io
| id::ids ->
used_id {io with addr_taken = PSet.add id io.addr_taken} ids
let used_in_globvar io gv =
let used_in_init_data io = function
| Init_addrof (id,_) -> used_id io [id]
| _ -> io in
List.fold_left used_in_init_data io gv.gvar_init
let fun_inline_analysis id io fn =
let inst io nid = function
| Iop (op, args, dest, succ) -> used_id io (globals_operation op)
| Iload (chunk, addr, args, dest, succ)
| Istore (chunk, addr, args, dest, succ) -> used_id io (globals_addressing addr)
| Ibuiltin (ef, args, dest, succ) -> used_id io (globals_of_builtin_args args)
| Icall (_, Coq_inr cid, _, _, _)
| Itailcall (_, Coq_inr cid, _) -> called cid io
| _ -> io in
PTree.fold inst fn.fn_code io
(* Gather information about the program used for inlining heuristic *)
let inlining_analysis (p: program) =
if !Clflags.option_finline && !Clflags.option_finline_functions_called_once then
List.fold_left (fun io idg ->
match idg with
| fid, Gfun (Internal f) -> fun_inline_analysis fid io f
| _, Gvar gv -> used_in_globvar io gv
| _ -> io) empty_inlining_info p.prog_defs
else
empty_inlining_info
(* Test whether a function is static and called only once *)
let static_called_once id io =
if !Clflags.option_finline_functions_called_once then
C2C.atom_is_static id && call_count id io <= 1 && not (address_taken id io)
else
false
(* To be considered: heuristics based on size of function? *)
let should_inline (io: inlining_info) (id: ident) (f: coq_function) =
if !Clflags.option_finline then begin
true
end else
false
|
