open Lambda

type label = int                     (* Symbolic code labels *)

type instruction =
    Klabel of label
  | Kacc of int
  | Kenvacc of int
  | Kpush
  | Kpop of int
  | Kassign of int
  | Kpush_retaddr of label
  | Kapply of int                       (* number of arguments *)
  | Kappterm of int * int               (* number of arguments, slot size *)
  | Kreturn of int                      (* slot size *)
  | Krestart
  | Kgrab of int                        (* number of arguments *)
  | Kclosure of label * int
  | Kclosurerec of label * int
  | Kgetglobal of Ident.t
  | Ksetglobal of Ident.t
  | Kconst of structured_constant
  | Kmakeblock of int * int             (* size, tag *)
  | Kgetfield of int
  | Ksetfield of int
  | Kdummy of int
  | Kupdate of int
  | Kvectlength
  | Kgetvectitem
  | Ksetvectitem
  | Kgetstringchar
  | Ksetstringchar
  | Kbranch of label
  | Kbranchif of label
  | Kbranchifnot of label
  | Kstrictbranchif of label
  | Kstrictbranchifnot of label
  | Kswitch of label array * label array
  | Ktranslate of (int * int * int) array
  | Kboolnot
  | Kpushtrap of label
  | Kpoptrap
  | Kraise
  | Kcheck_signals
  | Kccall of string * int
  | Knegint | Kaddint | Ksubint | Kmulint | Kdivint | Kmodint
  | Kandint | Korint | Kxorint | Klslint | Klsrint | Kasrint
  | Kintcomp of comparison
  | Koffsetint of int
  | Koffsetref of int
  | Kstop

let immed_min = -0x40000000
and immed_max = 0x3FFFFFFF

(* Actually the abstract machine accomodates -0x80000000 to 0x7FFFFFFF,
   but these numbers overflow the Caml type int if the compiler runs on
   a 32-bit processor. *)