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|
open Asttypes
open Lambda
open Obj
exception Unsupported
exception Not_constant
let extract_constant = function
Lconst sc -> sc
| _ -> raise Not_constant
(*
let rec transl_constant v =
if Obj.is_int v then
Const_base (Const_int (Obj.obj v))
else if Obj.is_block v then
let tag = Obj.tag v in
if tag >= no_scan_tag then
if tag = string_tag then
Const_base (Const_string (Obj.obj v))
else if tag = double_tag then
Const_base (Const_float (Obj.obj v))
else raise Unsupported
else
let len = Obj.size v in
let rec transl_args pos =
if pos = len then []
else
transl_constant (Obj.field v pos) :: transl_args (pos+1)
in
Const_block (tag, transl_args 0)
else raise Unsupported
*)
let scan v =
let blocks = ref [] in
let rec scan v =
if Obj.is_int v then ()
else if Obj.is_block v then
try
let numref = List.assq v !blocks in
incr numref
with
| Not_found ->
blocks := (v, ref 1) :: !blocks;
let tag = Obj.tag v in
if tag >= no_scan_tag then
if tag = string_tag then ()
else if tag = double_tag then ()
else raise Unsupported
else
let len = Obj.size v in
let rec scan_args pos =
if pos = len then ()
else begin
scan (Obj.field v pos);
scan_args (pos+1)
end
in
scan_args 0
else raise Unsupported
in
scan v;
!blocks
(* Only for immutable constant without functions *)
let transl_constant overrides v =
let shared_blocks =
List.map (fun (v,_) -> v, Ident.create "share")
(List.filter (fun (v,numref) -> !numref > 1) (scan v))
in
let rec transl share v =
if Obj.is_int v then
Lconst (Const_base (Const_int (Obj.obj v)))
else if Obj.is_block v then
try
let find_overrides () = List.assq v overrides in
if share then begin
try
Lvar (List.assq v shared_blocks)
with
| Not_found -> find_overrides ()
end else find_overrides ()
with
| Not_found ->
let tag = Obj.tag v in
if tag >= no_scan_tag then
if tag = string_tag then
Lconst (Const_base (Const_string (Obj.obj v)))
else if tag = double_tag then
Lconst (Const_base (Const_float (Obj.obj v)))
else raise Unsupported
else
let len = Obj.size v in
let rec transl_args pos =
if pos = len then []
else transl true (Obj.field v pos) :: transl_args (pos+1)
in
let args = transl_args 0 in
try
Lconst (Const_block (tag, List.map extract_constant args))
with
| Not_constant ->
Lprim(Pmakeblock(tag, Immutable), args)
else raise Unsupported
in
let defs = List.map (fun (v,id) -> id, transl false v) shared_blocks in
let body = transl false v in
match defs with
| [] -> body
| _ -> Lletrec (defs, body)
|
