Add CLI options to execute different test suites
[tiger.ml.git] / compiler / src / lib / tiger / tiger_semant.ml
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1module List = ListLabels
2
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3module A = Tiger_absyn
4module Env = Tiger_env
5module E = Tiger_error
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6module Translate = Tiger_translate
7module Type = Tiger_env_type
8module Value = Tiger_env_value
9
10(* The only reason for having this seemingly-superfluous inner module is to
11 * have this nice signature as a summary of what each function does. *)
12module Semant : sig
13 type expty =
14 { exp : Translate.exp
15 ; ty : Type.t
16 }
17
18 (* Violating normal naming convention just to make it easier to follow
19 * Appel's
20 *)
21 val transExp : env:Env.t -> A.exp -> expty
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22
23 (* transVar does not seem to be needed, as trvar handles all our cases.
24 * Am I wrong?
25 *
26 * val transVar : env:Env.t -> A.var -> expty
27 *
28 *)
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29end = struct
30 type expty =
31 { exp : Translate.exp
32 ; ty : Type.t
33 }
34
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35 let return ty = {exp = (); ty}
36 let return_unit = return Type.Unit
37 let return_nil = return Type.Nil
38 let return_int = return Type.Int
39 let return_string = return Type.String
155ee327 40
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41 let env_get_typ ~sym ~env ~pos : Type.t =
42 match Env.get_typ env sym with
43 | Some ty -> ty
44 | None -> E.raise (E.Unknown_type {ty_id=sym; pos})
45
46 let env_get_val ~sym ~env ~pos : Value.t =
47 match Env.get_val env sym with
48 | Some ty -> ty
49 | None -> E.raise (E.Unknown_id {id=sym; pos})
50
51 let check_same {exp=_; ty=ty_left} {exp=_; ty=ty_right} ~pos : unit =
52 if Type.is_equal ty_left ty_right then
53 ()
54 else
55 E.raise (E.Wrong_type {expected=ty_left; given=ty_right; pos})
56
57 let check_int expty ~pos : unit =
58 check_same {exp=(); ty=Type.Int} expty ~pos
59
978cb41c 60 (* TODO: actual_ty *)
def58eef 61 (* TODO: mutual recursion *)
978cb41c 62
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63 let rec transExp ~env exp =
64 let rec trexp exp =
65 (match exp with
66 | A.NilExp ->
67 return_nil
68 | A.IntExp _ ->
69 return_int
70 | A.StringExp {string=_; _} ->
71 return_string
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72 | A.CallExp {func; args; pos} ->
73 (match env_get_val ~sym:func ~env ~pos with
74 | Value.Fun {formals; result} ->
75 List.iter2 formals args ~f:(fun ty_expected exp_given ->
76 check_same {exp=(); ty = ty_expected} (trexp exp_given) ~pos;
77 );
78 return result
79 | Value.Var _ ->
80 E.raise (E.Id_not_a_function {id=func; pos})
81 )
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82 | A.OpExp {oper; left; right; pos} ->
83 trop oper ~left ~right ~pos
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84 | A.RecordExp {fields=field_exps; typ; pos} ->
85 let ty = env_get_typ ~sym:typ ~env ~pos in
86 Type.if_record
87 ty
88 ~f:(fun field_tys ->
89 List.iter field_exps ~f:(fun (field, exp, pos) ->
90 (match List.assoc_opt field field_tys with
91 | Some field_ty ->
92 check_same {exp=(); ty=field_ty} (trexp exp) ~pos
93 | None ->
94 E.raise
95 (E.No_such_field_in_record {field; record=ty; pos})
96 )
97 )
98 )
99 ~otherwise:(fun () ->
100 E.raise (E.Wrong_type_used_as_record {ty_id=typ; ty; pos})
101 );
102 return ty
9d8471b2 103 | A.SeqExp [] ->
523e2b06 104 return_unit
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105 | A.SeqExp exps ->
106 let last xs =
107 xs
108 |> List.rev (* Yes, redundant, but clean-looking ;-P *)
109 |> List.hd (* Empty is matched in above SeqExp match case *)
110 in
111 exps
112 |> List.map ~f:(fun (exp, _) -> let {ty; _} = trexp exp in ty)
113 |> last
114 |> return
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115 | A.AssignExp {var; exp; pos} ->
116 check_same (trvar var) (trexp exp) ~pos;
117 (* TODO: Add var->exp to val env? *)
118 return_unit
119 | A.IfExp {test; then'; else'; pos} ->
120 (* test : must be int, because we have no bool *)
121 (* then : must equal else *)
122 (* else : must equal then or be None *)
123 check_int (trexp test) ~pos;
124 (match (trexp then', else') with
125 | expty_then, None ->
126 expty_then
127 | expty_then, Some else' ->
128 let expty_else = trexp else' in
129 check_same expty_then expty_else ~pos;
130 expty_then
131 )
132 | A.WhileExp {test; body; pos} ->
133 (* test : must be int, because we have no bool *)
134 check_int (trexp test) ~pos;
135 ignore (trexp body); (* Only care if a type-error is raised *)
136 return_unit
137 | A.ForExp {var; lo; hi; body; pos; escape=_} ->
138 check_int (trexp lo) ~pos;
139 check_int (trexp hi) ~pos;
140 (* Only care if a type-error is raised *)
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141 let env = Env.set_val env var (Value.Var {ty = Type.Int}) in
142 ignore (transExp ~env body);
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143 return_unit
144 | A.BreakExp _ ->
145 return_unit
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146 | A.LetExp {decs; body; pos=_} ->
147 (* (1) decs augment env *)
148 (* (2) body checked against the new env *)
149 let env =
150 List.fold_left decs ~init:env ~f:(fun env dec -> transDec dec ~env)
151 in
152 transExp body ~env
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153 | A.ArrayExp {typ; size; init; pos} ->
154 check_int (trexp size) ~pos;
155 let ty = env_get_typ ~sym:typ ~env ~pos in
156 Type.if_array
157 ty
158 ~f:(fun ty_elements ->
159 check_same {exp=(); ty=ty_elements} (trexp init) ~pos
160 )
161 ~otherwise:(fun () ->
162 E.raise (E.Wrong_type_used_as_array {ty_id=typ; ty; pos})
163 );
164 return ty
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165 | A.VarExp var ->
166 trvar var
167 )
168 and trvar =
169 (function
170 | A.SimpleVar {symbol=sym; pos} ->
171 (match env_get_val ~sym ~env ~pos with
172 | Value.Fun _ -> E.raise (E.Id_is_a_function {id=sym; pos})
173 | Value.Var {ty} -> return ty
174 )
175 | A.FieldVar {var; symbol; pos} ->
176 let {exp=_; ty} = trvar var in
177 Type.if_record
178 ty
179 ~f:(fun fields ->
180 (match List.assoc_opt symbol fields with
181 | None ->
182 E.raise
183 (E.No_such_field_in_record {field=symbol; record=ty; pos})
184 | Some ty ->
185 return ty
186 )
187 )
188 ~otherwise:(fun () -> E.raise (E.Exp_not_a_record {ty; pos}))
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189 | A.SubscriptVar {var; exp; pos} ->
190 let {exp=_; ty} = trvar var in
191 check_int (trexp exp) ~pos;
192 Type.if_array
193 ty
194 ~f:(fun ty_elements -> return ty_elements)
195 ~otherwise:(fun () -> E.raise (E.Exp_not_an_array {ty; pos}))
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196 )
197 and trop oper ~left ~right ~pos =
198 let expty_left = trexp left in
199 let expty_right = trexp right in
200 check_same expty_left expty_right ~pos;
201 let {exp=_; ty} = expty_left in
202 let module T = Type in
203 (match oper with
204 (* Arithmetic: int *)
205 | A.PlusOp
206 | A.MinusOp
207 | A.TimesOp
208 | A.DivideOp ->
209 check_int expty_left ~pos;
210 return_int
211 (* Equality: int, string, array, record *)
212 | A.EqOp
213 | A.NeqOp ->
214 if (T.is_int ty)
215 || (T.is_string ty)
216 || (T.is_array ty)
217 || (T.is_record ty)
218 then
219 return ty
220 else
221 E.raise (E.Invalid_operand_type
222 { oper
223 ; valid = ["int"; "string"; "array"; "record"]
224 ; given = ty
225 ; pos
226 })
227 (* Order: int, string *)
228 | A.LtOp
229 | A.LeOp
230 | A.GtOp
231 | A.GeOp ->
232 if (T.is_int ty)
233 || (T.is_string ty)
234 then
235 return ty
236 else
237 E.raise (E.Invalid_operand_type
238 { oper
239 ; valid = ["int"; "string"]
240 ; given = ty
241 ; pos
242 })
243 )
244 in
245 trexp exp
862e5c05 246 and transDec ~(env : Env.t) (dec : A.dec) : Env.t =
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247 (match dec with
248 | A.VarDec {name; typ=typ_opt; init; pos=pos_outter; escape=_} ->
249 let ty =
250 (match (typ_opt, transExp ~env init) with
251 | None, {ty; exp=()} ->
252 ty
253 | Some (sym, pos_inner), expty_init ->
254 let ty = env_get_typ ~sym ~env ~pos:pos_inner in
255 check_same {exp=(); ty} expty_init ~pos:pos_outter;
256 ty
257 )
258 in
259 Env.set_val env name (Value.Var {ty})
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260 | A.TypeDecs typedecs ->
261 List.fold_left typedecs ~init:env ~f:(
262 fun env (A.TypeDec {name; ty; pos=_}) ->
263 let ty = transTy ~env ty in
264 Env.set_typ env name ty
265 )
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266 | A.FunDecs fundecs ->
267 List.fold_left fundecs ~init:env ~f:(
268 fun env (A.FunDec {name; params; result; body; pos=_}) ->
269 let (env_for_body, formals_in_reverse_order) =
270 List.fold_left params ~init:(env, []) ~f:(
271 fun (env, formals) (A.Field {name; escape=_; typ; pos}) ->
272 let ty = env_get_typ ~env ~sym:typ ~pos in
273 let env = Env.set_val env name (Value.Var {ty}) in
274 (env, ty :: formals)
275 )
276 in
277 (* ignore because we only care if an exception is raised *)
278 ignore (transExp ~env:env_for_body body);
279 let formals = List.rev formals_in_reverse_order in
280 let result =
281 match result with
282 | None ->
283 Type.Unit
284 | Some (sym, pos) ->
285 env_get_typ ~sym ~env ~pos
286 in
287 Env.set_val env name (Value.Fun {formals; result})
288 )
8744eb3a 289 )
862e5c05 290 and transTy ~(env : Env.t) (typ : A.ty) : Type.t =
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291 (match typ with
292 | A.NameTy {symbol=sym; pos} ->
293 env_get_typ ~sym ~env ~pos
294 | A.RecordTy fields ->
295 let fields =
296 List.map fields ~f:(fun (A.Field {name; escape=_; typ; pos}) ->
297 let ty = env_get_typ ~sym:typ ~env ~pos in
298 (name, ty)
299 )
300 in
301 Type.new_record fields
302 | A.ArrayTy {symbol=sym; pos} ->
303 let element_ty = env_get_typ ~sym ~env ~pos in
304 Type.new_array element_ty
305 )
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306end
307
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308open Semant
309
155ee327 310let transProg absyn =
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311 let {exp = _; ty = _} = transExp absyn ~env:Env.base in
312 ()
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