Project

General

Profile

Statistics
| Branch: | Tag: | Revision:

lustrec / src / horn_backend.ml @ 7a19992d

History | View | Annotate | Download (8.92 KB)

1
open Format
2
open LustreSpec
3
open Corelang
4
open Machine_code
5

    
6

    
7
let pp_machine_reset_name fmt id = fprintf fmt "%s_reset" id
8
let pp_machine_step_name fmt id = fprintf fmt "%s_step" id
9

    
10
let pp_type fmt t =
11
  match (Types.repr t).Types.tdesc with
12
  | Types.Tbool           -> Format.fprintf fmt "Bool"
13
  | Types.Tint            -> Format.fprintf fmt "Int"
14
  | Types.Tclock _
15
  | Types.Tarray _
16
  | Types.Tstatic _
17
  | Types.Tconst _
18
  | Types.Tarrow _
19
  | _                     -> Format.eprintf "internal error: pp_type %a@." 
20
                             Types.print_ty t; assert false
21
    
22

    
23
let pp_decl_var fmt id = 
24
  Format.fprintf fmt "(declare_var %s %a)"
25
    id.var_id
26
    pp_type id.var_type
27

    
28
let pp_var fmt id = Format.pp_print_string fmt id.var_id
29

    
30
let pp_instr machine_name fmt i =
31
  Format.fprintf fmt "(xxx)"
32

    
33
let rename f = (fun v -> {v with var_id = f v.var_id } )
34
let rename_current machine_name =  rename (fun n -> machine_name ^ "." ^ n ^ "_c")
35
let rename_current_list machine_name = List.map (rename_current machine_name)
36
let rename_next machine_name = rename (fun n -> machine_name ^ "." ^ n ^ "_x")
37
let rename_next_list machine_name = List.map (rename_next machine_name)
38
let rename_machine machine_name = rename (fun n -> machine_name ^ "." ^ n)
39
let rename_machine_list machine_name = List.map (rename_machine machine_name)
40

    
41
let machine_vars m = 
42
  (rename_current_list m.mname.node_id m.mmemory)@
43
    (rename_next_list m.mname.node_id m.mmemory)@
44
    (rename_machine_list m.mname.node_id m.mstep.step_inputs)@
45
    (rename_machine_list m.mname.node_id m.mstep.step_outputs)
46

    
47

    
48
(********************************************************************************************)
49
(*                    Instruction Printing functions                                        *)
50
(********************************************************************************************)
51

    
52
let pp_horn_var m fmt id =
53
  if Types.is_array_type id.var_type
54
  then
55
    assert false (* no arrays in Horn output *)
56
  else
57
    Format.fprintf fmt "%s" id.var_id
58

    
59

    
60
(* Used to print boolean constants *)
61
let pp_horn_tag fmt t =
62
  pp_print_string fmt (if t = tag_true then "1" else if t = tag_false then "0" else t)
63

    
64
(* Prints a constant value *)
65
let rec pp_horn_const fmt c =
66
  match c with
67
    | Const_int i    -> pp_print_int fmt i
68
    | Const_real r   -> pp_print_string fmt r
69
    | Const_float r  -> pp_print_float fmt r
70
    | Const_tag t    -> pp_horn_tag fmt t
71
    | Const_array ca -> assert false
72

    
73
(* Prints a value expression [v], with internal function calls only.
74
   [pp_var] is a printer for variables (typically [pp_c_var_read]),
75
   but an offset suffix may be added for array variables
76
*)
77
let rec pp_horn_val ?(is_lhs=false) self pp_var fmt v =
78
  match v with
79
    | Cst c         -> pp_horn_const fmt c
80
    | Array _      
81
    | Access _ -> assert false (* no arrays *)
82
    | Power (v, n)  -> assert false
83
    | LocalVar v    -> pp_var fmt (rename_machine self v)
84
    | StateVar v    ->
85
      if Types.is_array_type v.var_type
86
      then assert false 
87
      else pp_var fmt ((if is_lhs then rename_next else rename_current) self v)
88
    | Fun (n, vl)   -> Format.fprintf fmt "(%a)" (Basic_library.pp_horn n (pp_horn_val self pp_var)) vl
89

    
90
(* Prints a [value] indexed by the suffix list [loop_vars] *)
91
let rec pp_value_suffix self pp_value fmt value =
92
 match value with
93
 | Fun (n, vl)  ->
94
   Basic_library.pp_horn n (pp_value_suffix self pp_value) fmt vl
95
 |  _            ->
96
   pp_horn_val self pp_value fmt value
97

    
98
(* type_directed assignment: array vs. statically sized type
99
   - [var_type]: type of variable to be assigned
100
   - [var_name]: name of variable to be assigned
101
   - [value]: assigned value
102
   - [pp_var]: printer for variables
103
*)
104
let pp_assign m self pp_var fmt var_type var_name value =
105
  fprintf fmt "(%a = %a)" (pp_horn_val ~is_lhs:true self pp_var) var_name (pp_value_suffix self pp_var) value
106
  
107
let pp_instance_call machines ?(init=false) m self fmt i (inputs: value_t list) (outputs: var_decl list) =
108
 try (* stateful node instance *) (
109
   let (n,_) = List.assoc i m.minstances in
110
   match node_name n, inputs, outputs with
111
   | "_arrow", [i1; i2], [o] -> (
112
     if init then
113
       pp_assign
114
	 m self (pp_horn_val self (pp_horn_var m) fmt o) fmt
115
	 o.var_type (LocalVar o) i1
116
     else
117
       pp_assign
118
	 m self (pp_horn_val self (pp_horn_var m) fmt o) fmt
119
	 o.var_type (LocalVar o) i2
120
       
121
   )
122
   | name, _, _ ->  (
123
     let target_machine = List.find (fun m  -> m.mname.node_id = name) machines in
124
     Format.fprintf fmt "(%s_%s %a%txxx%axxx%t%a)"
125
       (node_name n) (if init then "init" else "step")
126
       (Utils.fprintf_list ~sep:" " (pp_horn_val self (pp_horn_var m))) inputs
127
       (Utils.pp_final_char_if_non_empty " " inputs) 
128
       (Utils.fprintf_list ~sep:" " (pp_horn_val self (pp_horn_var m))) outputs
129
       (Utils.pp_final_char_if_non_empty " " outputs)
130
       
131
       (Utils.fprintf_list ~sep:" " pp_var) (machine_vars target_machine)
132
       
133
   )
134
 )
135
 with Not_found -> (* stateless node instance *)
136
   let (n,_) = List.assoc i m.mcalls in
137
   Format.fprintf fmt "(%s %a%t%a)"
138
     (node_name n)
139
     (Utils.fprintf_list ~sep:" " (pp_horn_val self (pp_horn_var m))) inputs
140
     (Utils.pp_final_char_if_non_empty " " inputs) 
141
     (Utils.fprintf_list ~sep:" " (pp_horn_var m)) outputs 
142

    
143
let pp_machine_reset (m: machine_t) self fmt inst =
144
  let (node, static) = List.assoc inst m.minstances in
145
  fprintf fmt "(%a %a%t%s->%s)"
146
    pp_machine_reset_name (node_name node)
147
    (Utils.fprintf_list ~sep:" " Dimension.pp_dimension) static
148
    (Utils.pp_final_char_if_non_empty " " static)
149
    self inst
150

    
151
(* TODO *)
152
let rec pp_conditional machines ?(init=false)  (m: machine_t) self fmt c tl el =
153
  fprintf fmt "@[<v 2>if (%a) {%t%a@]@,@[<v 2>} else {%t%a@]@,}"
154
    (pp_horn_val self (pp_horn_var m)) c
155
    (Utils.pp_newline_if_non_empty tl)
156
    (Utils.fprintf_list ~sep:"@," (pp_machine_instr machines ~init:init  m self)) tl
157
    (Utils.pp_newline_if_non_empty el)
158
    (Utils.fprintf_list ~sep:"@," (pp_machine_instr machines ~init:init  m self)) el
159

    
160
and pp_machine_instr machines ?(init=false) (m: machine_t) self fmt instr =
161
  match instr with 
162
  | MReset i ->
163
    pp_machine_reset m self fmt i
164
  | MLocalAssign (i,v) ->
165
    pp_assign
166
      m self (pp_horn_var m) fmt
167
      i.var_type (LocalVar i) v
168
  | MStateAssign (i,v) ->
169
    pp_assign
170
      m self (pp_horn_var m) fmt
171
      i.var_type (StateVar i) v
172
  | MStep ([i0], i, vl) when Basic_library.is_internal_fun i  ->
173
    pp_machine_instr machines ~init:init m self fmt (MLocalAssign (i0, Fun (i, vl)))
174
  | MStep (il, i, vl) ->
175
    pp_instance_call machines ~init:init m self fmt i vl il
176
  | MBranch (g,hl) ->
177
    if hl <> [] && let t = fst (List.hd hl) in t = tag_true || t = tag_false
178
    then (* boolean case, needs special treatment in C because truth value is not unique *)
179
	 (* may disappear if we optimize code by replacing last branch test with default *)
180
      let tl = try List.assoc tag_true  hl with Not_found -> [] in
181
      let el = try List.assoc tag_false hl with Not_found -> [] in
182
      pp_conditional machines ~init:init m self fmt g tl el
183
    else assert false (* enum type case *)
184

    
185

    
186
(**************************************************************)
187
    
188
(* Print the machine m: 
189
   two functions: m_init and m_step
190
   - m_init is a predicate over m memories
191
   - m_step is a predicate over old_memories, inputs, new_memories, outputs
192
   We first declare all variables then the two /rules/.
193
*)
194
let print_machine machines fmt m = 
195
  let pp_instr init = pp_machine_instr machines ~init:init m in
196
  if m.mname.node_id = arrow_id then () 
197
  else 
198
    ( (* We don't print arrow function *)
199
   Format.fprintf fmt "; %s@." m.mname.node_id;
200
   (* Printing variables *)
201
   Utils.fprintf_list ~sep:"@." pp_decl_var fmt 
202
     ((machine_vars m)@(rename_machine_list m.mname.node_id m.mstep.step_locals));
203
   Format.pp_print_newline fmt ();
204
   (* Declaring predicate *)
205
   Format.fprintf fmt "(declare-rel %a (%a))@."
206
     pp_machine_reset_name m.mname.node_id
207
     (Utils.fprintf_list ~sep:" " pp_type) (List.map (fun v -> v.var_type) m.mmemory);
208
   
209
   Format.fprintf fmt "(declare-rel %a (%a))@."
210
     pp_machine_step_name m.mname.node_id
211
     (Utils.fprintf_list ~sep:" " pp_type) (List.map (fun v -> v.var_type) (machine_vars m));
212
   Format.pp_print_newline fmt ();
213

    
214
   Format.fprintf fmt "@[<v 2>(rule (=> @ (and @[<v 0>%a@]@ )@ (%s_init %a)@]@.))@.@."
215
     (Utils.fprintf_list ~sep:"@ " (pp_instr true m.mname.node_id)) m.mstep.step_instrs
216
     m.mname.node_id
217
     (Utils.fprintf_list ~sep:" " pp_var) (rename_next_list m.mname.node_id m.mmemory);
218

    
219
   Format.fprintf fmt "@[<v 2>(rule (=> @ (and @[<v 0>%a@]@ )@ (%s_step %a)@]@.))@.@."
220
     (Utils.fprintf_list ~sep:"@ " (pp_instr false m.mname.node_id)) m.mstep.step_instrs
221
     m.mname.node_id
222
     (Utils.fprintf_list ~sep:" " pp_var) (machine_vars m);
223
   
224
()
225
  )
226

    
227
let main_print fmt = ()
228

    
229
let translate fmt basename prog machines =
230
  List.iter (print_machine machines fmt) (List.rev machines);
231
  main_print fmt 
232

    
233

    
234
(* Local Variables: *)
235
(* compile-command:"make -C .." *)
236
(* End: *)