42 lines
1.4 KiB
Standard ML
42 lines
1.4 KiB
Standard ML
(* A variant of the "lambda" code with direct / indirect calls explicit
|
|
and closures explicit too *)
|
|
|
|
open Asttypes
|
|
open Lambda
|
|
|
|
type function_label = string
|
|
|
|
type ulambda =
|
|
Uvar of Ident.t
|
|
| Uconst of structured_constant
|
|
| Udirect_apply of function_label * ulambda list
|
|
| Ugeneric_apply of ulambda * ulambda list
|
|
| Uclosure of (function_label * int * Ident.t list * ulambda) list
|
|
* ulambda list
|
|
| Uoffset of ulambda * int
|
|
| Ulet of Ident.t * ulambda * ulambda
|
|
| Uletrec of (Ident.t * ulambda) list * ulambda
|
|
| Uprim of primitive * ulambda list
|
|
| Uswitch of ulambda * int array * ulambda array * int array * ulambda array
|
|
| Ustaticfail
|
|
| Ucatch of ulambda * ulambda
|
|
| Utrywith of ulambda * Ident.t * ulambda
|
|
| Uifthenelse of ulambda * ulambda * ulambda
|
|
| Usequence of ulambda * ulambda
|
|
| Uwhile of ulambda * ulambda
|
|
| Ufor of Ident.t * ulambda * ulambda * direction_flag * ulambda
|
|
|
|
(* Description of known functions *)
|
|
|
|
type function_description =
|
|
{ fun_label: function_label; (* Label of direct entry point *)
|
|
fun_arity: int; (* Number of arguments *)
|
|
mutable fun_closed: bool } (* True if environment not used *)
|
|
|
|
(* Approximation of values *)
|
|
|
|
type value_approximation =
|
|
Value_closure of function_description * value_approximation
|
|
| Value_tuple of value_approximation array
|
|
| Value_unknown
|