(***********************************************************************)
(*                                                                     *)
(*                           Objective Caml                            *)
(*                                                                     *)
(*            Xavier Leroy, projet Cristal, INRIA Rocquencourt         *)
(*                                                                     *)
(*  Copyright 1996 Institut National de Recherche en Informatique et   *)
(*  en Automatique.  All rights reserved.  This file is distributed    *)
(*  under the terms of the Q Public License version 1.0.               *)
(*                                                                     *)
(***********************************************************************)

(* $Id$ *)

open Format
open Asttypes
open Primitive
open Types
open Lambda


let rec struct_const ppf = function
  | Const_base(Const_int n) -> fprintf ppf "%i" n
  | Const_base(Const_char c) ->
      fprintf ppf "'%s'" (Char.escaped c)
  | Const_base(Const_string s) ->
      fprintf ppf "\"%s\"" (String.escaped s)
  | Const_base(Const_float s) ->
      fprintf ppf "%s" s
  | Const_pointer n -> fprintf ppf "%ia" n
  | Const_block(tag, []) ->
      fprintf ppf "[%i]" tag
  | Const_block(tag, sc1::scl) ->
      let sconsts ppf scl =
        List.iter (fun sc -> fprintf ppf "@ %a" struct_const sc) scl in
      fprintf ppf "@[<1>[%i:@ @[%a%a@]]@]" tag struct_const sc1 sconsts scl
  | Const_float_array [] ->
      fprintf ppf "[| |]"
  | Const_float_array (f1 :: fl) ->
      let floats ppf fl =
        List.iter (fun f -> fprintf ppf "@ %s" f) fl in
      fprintf ppf "@[<1[|@[%s%a@]|]@]" f1 floats fl

let print_id ppf id = Ident.print id

let boxed_integer_name = function
  | Pnativeint -> "nativeint"
  | Pint32 -> "int32"
  | Pint64 -> "int64"

let print_boxed_integer name ppf bi =
  fprintf ppf "%s_%s" (boxed_integer_name bi) name

let print_boxed_integer_conversion ppf bi1 bi2 =
  fprintf ppf "%s_of_%s" (boxed_integer_name bi2) (boxed_integer_name bi1)

let boxed_integer_mark name = function
  | Pnativeint -> Printf.sprintf "Nativeint.%s" name
  | Pint32 -> Printf.sprintf "Int32.%s" name
  | Pint64 -> Printf.sprintf "Int64.%s" name

let print_boxed_integer name ppf bi =
  fprintf ppf "%s" (boxed_integer_mark name bi);;

let print_bigarray name kind ppf layout =
  fprintf ppf "Bigarray.%s[%s,%s]"
    name
    (match kind with
     | Pbigarray_unknown -> "generic"
     | Pbigarray_float32 -> "float32"
     | Pbigarray_float64 -> "float64"
     | Pbigarray_sint8 -> "sint8"
     | Pbigarray_uint8 -> "uint8"
     | Pbigarray_sint16 -> "sint16"
     | Pbigarray_uint16 -> "uint16"
     | Pbigarray_int32 -> "int32"
     | Pbigarray_int64 -> "int64"
     | Pbigarray_caml_int -> "camlint"
     | Pbigarray_native_int -> "nativeint")
    (match layout with
    |  Pbigarray_unknown_layout -> "unknown"
     | Pbigarray_c_layout -> "C"
     | Pbigarray_fortran_layout -> "Fortran")

let primitive ppf = function
  | Pidentity -> fprintf ppf "id"
  | Pignore -> fprintf ppf "ignore"
  | Pgetglobal id -> fprintf ppf "global %a" print_id id
  | Psetglobal id -> fprintf ppf "setglobal %a" print_id id
  | Pmakeblock(tag, Immutable) -> fprintf ppf "makeblock %i" tag
  | Pmakeblock(tag, Mutable) -> fprintf ppf "makemutable %i" tag
  | Pfield n -> fprintf ppf "field %i" n
  | Psetfield(n, ptr) ->
      let instr = if ptr then "setfield_ptr " else "setfield_imm " in
      fprintf ppf "%s%i" instr n
  | Pfloatfield n -> fprintf ppf "floatfield %i" n
  | Psetfloatfield n -> fprintf ppf "setfloatfield %i" n
  | Pccall p -> fprintf ppf "%s" p.prim_name
  | Praise -> fprintf ppf "raise"
  | Psequand -> fprintf ppf "&&"
  | Psequor -> fprintf ppf "||"
  | Pnot -> fprintf ppf "not"
  | Pnegint -> fprintf ppf "~"
  | Paddint -> fprintf ppf "+"
  | Psubint -> fprintf ppf "-"
  | Pmulint -> fprintf ppf "*"
  | Pdivint -> fprintf ppf "/"
  | Pmodint -> fprintf ppf "mod"
  | Pandint -> fprintf ppf "and"
  | Porint -> fprintf ppf "or"
  | Pxorint -> fprintf ppf "xor"
  | Plslint -> fprintf ppf "lsl"
  | Plsrint -> fprintf ppf "lsr"
  | Pasrint -> fprintf ppf "asr"
  | Pintcomp(Ceq) -> fprintf ppf "=="
  | Pintcomp(Cneq) -> fprintf ppf "!="
  | Pintcomp(Clt) -> fprintf ppf "<"
  | Pintcomp(Cle) -> fprintf ppf "<="
  | Pintcomp(Cgt) -> fprintf ppf ">"
  | Pintcomp(Cge) -> fprintf ppf ">="
  | Poffsetint n -> fprintf ppf "%i+" n
  | Poffsetref n -> fprintf ppf "+:=%i"n
  | Pintoffloat -> fprintf ppf "int_of_float"
  | Pfloatofint -> fprintf ppf "float_of_int"
  | Pnegfloat -> fprintf ppf "~."
  | Pabsfloat -> fprintf ppf "abs."
  | Paddfloat -> fprintf ppf "+."
  | Psubfloat -> fprintf ppf "-."
  | Pmulfloat -> fprintf ppf "*."
  | Pdivfloat -> fprintf ppf "/."
  | Pfloatcomp(Ceq) -> fprintf ppf "==."
  | Pfloatcomp(Cneq) -> fprintf ppf "!=."
  | Pfloatcomp(Clt) -> fprintf ppf "<."
  | Pfloatcomp(Cle) -> fprintf ppf "<=."
  | Pfloatcomp(Cgt) -> fprintf ppf ">."
  | Pfloatcomp(Cge) -> fprintf ppf ">=."
  | Pstringlength -> fprintf ppf "string.length"
  | Pstringrefu -> fprintf ppf "string.unsafe_get"
  | Pstringsetu -> fprintf ppf "string.unsafe_set"
  | Pstringrefs -> fprintf ppf "string.get"
  | Pstringsets -> fprintf ppf "string.set"
  | Parraylength _ -> fprintf ppf "array.length"
  | Pmakearray _ -> fprintf ppf "makearray "
  | Parrayrefu _ -> fprintf ppf "array.unsafe_get"
  | Parraysetu _ -> fprintf ppf "array.unsafe_set"
  | Parrayrefs _ -> fprintf ppf "array.get"
  | Parraysets _ -> fprintf ppf "array.set"
  | Pisint -> fprintf ppf "isint"
  | Pbittest -> fprintf ppf "testbit"
  | Pbintofint bi -> print_boxed_integer "of_int" ppf bi
  | Pintofbint bi -> print_boxed_integer "to_int" ppf bi
  | Pcvtbint (bi1, bi2) -> print_boxed_integer_conversion ppf bi1 bi2
  | Pnegbint bi -> print_boxed_integer "neg" ppf bi
  | Paddbint bi -> print_boxed_integer "add" ppf bi
  | Psubbint bi -> print_boxed_integer "sub" ppf bi
  | Pmulbint bi -> print_boxed_integer "mul" ppf bi
  | Pdivbint bi -> print_boxed_integer "div" ppf bi
  | Pmodbint bi -> print_boxed_integer "mod" ppf bi
  | Pandbint bi -> print_boxed_integer "and" ppf bi
  | Porbint bi -> print_boxed_integer "or" ppf bi
  | Pxorbint bi -> print_boxed_integer "xor" ppf bi
  | Plslbint bi -> print_boxed_integer "lsl" ppf bi
  | Plsrbint bi -> print_boxed_integer "lsr" ppf bi
  | Pasrbint bi -> print_boxed_integer "asr" ppf bi
  | Pbintcomp(bi, Ceq) -> print_boxed_integer "==" ppf bi
  | Pbintcomp(bi, Cneq) -> print_boxed_integer "!=" ppf bi
  | Pbintcomp(bi, Clt) -> print_boxed_integer "<" ppf bi
  | Pbintcomp(bi, Cgt) -> print_boxed_integer ">" ppf bi
  | Pbintcomp(bi, Cle) -> print_boxed_integer "<=" ppf bi
  | Pbintcomp(bi, Cge) -> print_boxed_integer ">=" ppf bi
  | Pbigarrayref(n, kind, layout) -> print_bigarray "get" kind ppf layout
  | Pbigarrayset(n, kind, layout) -> print_bigarray "set" kind ppf layout

let rec lam ppf = function
  | Lvar id ->
      print_id ppf id
  | Lconst cst ->
      struct_const ppf cst
  | Lapply(lfun, largs) ->
      let lams ppf largs =
        List.iter (fun l -> fprintf ppf "@ %a" lam l) largs in
      fprintf ppf "@[<2>(apply@ %a%a)@]" lam lfun lams largs
  | Lfunction(kind, params, body) ->
      let pr_params ppf params =
        match kind with
        | Curried ->
            List.iter (fun param -> fprintf ppf "@ %a" print_id param) params
        | Tupled ->
            fprintf ppf " (";
            let first = ref true in
            List.iter
              (fun param ->
                if !first then first := false else fprintf ppf ",@ ";
                print_id ppf param)
              params;
            fprintf ppf ")" in
      fprintf ppf "@[<2>(function%a@ %a)@]" pr_params params lam body
  | Llet(str, id, arg, body) ->
      let rec letbody = function
        | Llet(str, id, arg, body) ->
            fprintf ppf "@ @[<2>%a@ %a@]" print_id id lam arg;
            letbody body
        | expr -> expr in
      fprintf ppf "@[<2>(let@ @[<hv 1>(@[<2>%a@ %a@]" print_id id lam arg;
      let expr = letbody body in
      fprintf ppf ")@]@ %a)@]" lam expr
  | Lletrec(id_arg_list, body) ->
      let bindings ppf id_arg_list =
        let spc = ref false in
        List.iter
          (fun (id, l) ->
            if !spc then print_space() else spc := true;
            fprintf ppf "@[<2>%a@ %a@]" print_id id lam l)
          id_arg_list in
      fprintf ppf
        "@[<2>(letrec@ (@[<hv 1>%a@])@ %a)@]" bindings id_arg_list lam body
  | Lprim(prim, largs) ->
      let lams ppf largs =
        List.iter (fun l -> fprintf ppf "@ %a" lam l) largs in
      fprintf ppf "@[<2>(%a%a)@]" primitive prim lams largs
  | Lswitch(larg, sw) ->
      let switch ppf sw =
        let spc = ref false in
        List.iter
         (fun (n, l) ->
           if !spc then print_space() else spc := true;
           fprintf ppf "@[<hv 1>case int %i:@ %a@]" n lam l)
         sw.sw_consts;
       List.iter
         (fun (n, l) ->
           if !spc then print_space() else spc := true;
           fprintf ppf "@[<hv 1>case tag %i:@ %a@]" n lam l)
         sw.sw_blocks in
      fprintf ppf
       "@[<1>(%s%a@ @[<v 0>%a@])@]"
       (if sw.sw_checked then "switch-checked " else "switch ")
       lam larg switch sw
  | Lstaticfail ->
      fprintf ppf "exit"
  | Lcatch(lbody, lhandler) ->
      fprintf ppf "@[<2>(catch@ %a@;<1 -1>with@ %a)@]" lam lbody lam lhandler
  | Ltrywith(lbody, param, lhandler) ->
      fprintf ppf "@[<2>(try@ %a@;<1 -1>with %a@ %a)@]"
        lam lbody print_id param lam lhandler
  | Lifthenelse(lcond, lif, lelse) ->
      fprintf ppf "@[<2>(if@ %a@ %a@ %a)@]" lam lcond lam lif lam lelse
  | Lsequence(l1, l2) ->
      fprintf ppf "@[<2>(seq@ %a@ %a)@]" lam l1 sequence l2
  | Lwhile(lcond, lbody) ->
      fprintf ppf "@[<2>(while@ %a@ %a)@]" lam lcond lam lbody
  | Lfor(param, lo, hi, dir, body) ->
      fprintf ppf "@[<2>(for %a@ %a@ %s@ %a@ %a)@]"
       print_id param lam lo
       (match dir with Upto -> "to" | Downto -> "downto")
       lam hi lam body
  | Lassign(id, expr) ->
      fprintf ppf "@[<2>(assign@ %a@ %a)@]" print_id id lam expr
  | Lsend (met, obj, largs) ->
      let args ppf largs =
        List.iter (fun l -> fprintf ppf "@ %a" lam l) largs in
      fprintf ppf "@[<2>(send@ %a@ %a%a)@]" lam obj lam met args largs
  | Levent(expr, ev) ->
      let kind = 
       match ev.lev_kind with
       | Lev_before -> "before"
       | Lev_after _  -> "after"
       | Lev_function -> "funct-body" in
      fprintf ppf "@[<2>(%s %i@ %a)@]" kind ev.lev_loc lam expr
  | Lifused(id, expr) ->
      fprintf ppf "@[<2>(ifused@ %a@ %a)@]" print_id id lam expr

and sequence ppf = function
  | Lsequence(l1, l2) ->
      fprintf ppf "%a@ %a" sequence l1 sequence l2
  | Llet(str, id, arg, body) ->
      fprintf ppf "@[<2>let@ %a@ %a@]@ %a" print_id id lam arg sequence body
  | l ->
      lam ppf l

let structured_constant = struct_const

let lambda = lam