-
Notifications
You must be signed in to change notification settings - Fork 0
/
codegen.ml
650 lines (583 loc) · 30 KB
/
codegen.ml
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
(* Code generation: translate takes a semantically checked AST and
* Initially based on MicroC, with inspiration from Shoo
* Written by Elaine Wang, Justin Chen, Riya Chakraborty, and Caroline Hoang
*)
module L = Llvm
module A = Ast
open Sast
module StringMap = Map.Make(String)
(* translate : Sast.program -> Llvm.module *)
let translate (globals, functions, structs) =
let context = L.global_context () in
(* Create the LLVM compilation module into which
we will generate code *)
let the_module = L.create_module context "RJEC" in
(* Get types from the context *)
let i64_t = L.i64_type context
and i32_t = L.i32_type context
and i8_t = L.i8_type context
and i1_t = L.i1_type context
and void_t = L.void_type context
and void_ptr_t = L.pointer_type (L.i8_type context) in
let func_t = L.pointer_type (L.function_type i32_t [| void_ptr_t |]) in
let rec generate_seq n = if n >= 0 then (n :: (generate_seq (n-1))) else [] in
let struct_decls : ((A.typ StringMap.t) * L.lltype) StringMap.t =
let add_struct m (n, ml) =
let ltype_of_basic_typ ((t, _) : (A.typ * string)) : L.lltype = match t with
A.Int -> i32_t
| A.Bool -> i1_t
| A.Char -> i8_t
| _ -> raise(Failure("Struct member typ not basic -- should've been checked in parser!\n"))
in
let compare_by (_, n1) (_, n2) = compare n1 n2 in
let member_typs = Array.of_list (List.map ltype_of_basic_typ (List.sort compare_by ml)) in
let struct_t = L.struct_type context member_typs in
let member_names = List.fold_left (fun m (t, n) -> StringMap.add n t m) StringMap.empty ml in
StringMap.add n (member_names, struct_t) m
in List.fold_left add_struct StringMap.empty structs
in
(* Return the LLVM type for a RJEC type *)
let rec ltype_of_typ : A.typ -> L.lltype = function
A.Int -> i32_t
| A.Bool -> i1_t
| A.Char -> i8_t
| A.Struct(n) -> snd (StringMap.find n struct_decls)
| A.Chan(_) -> void_ptr_t
| A.Array(t) -> L.pointer_type (ltype_of_typ t)
in
let typ_to_typ_char (t : A.typ) = match t with
A.Int -> L.const_int i8_t (Char.code 'i')
| A.Bool -> L.const_int i8_t (Char.code 'b')
| A.Char -> L.const_int i8_t (Char.code 'c')
| _ -> raise(Failure("non-basic type for chan; should've checked in parser"))
in
(* Create a map of global variables after creating each *)
let global_vars : L.llvalue StringMap.t =
let global_var m (t, n) =
let init = match t with
_ -> L.const_int (ltype_of_typ t) 0
(* TODO: add other cases *)
in StringMap.add n (L.define_global n init the_module) m in
List.fold_left global_var StringMap.empty globals in
let printf_t : L.lltype =
L.var_arg_function_type i32_t [| L.pointer_type i8_t |] in
let printf_func : L.llvalue =
L.declare_function "printf" printf_t the_module in
let gettime_t : L.lltype =
L.function_type i32_t [| |] in
let gettime_func : L.llvalue =
L.declare_function "get_time" gettime_t the_module in
let printbool_t : L.lltype =
L.function_type i32_t [| i1_t |] in
let printbool_func : L.llvalue =
L.declare_function "printbool" printbool_t the_module in
let yeet_t : L.lltype =
L.function_type void_t [| func_t ; void_ptr_t |] in
let yeet_func : L.llvalue =
L.declare_function "yeet" yeet_t the_module in
let makechan_t : L.lltype =
L.function_type void_ptr_t [| i8_t ; i32_t |] in
let makechan_func : L.llvalue =
L.declare_function "makechan" makechan_t the_module in
let send_t : L.lltype =
L.function_type void_t [| void_ptr_t ; i8_t ; i32_t |] in
let send_func : L.llvalue =
L.declare_function "send" send_t the_module in
let recv_int_t : L.lltype =
L.function_type i32_t [| void_ptr_t |] in
let recv_bool_t : L.lltype =
L.function_type i1_t [| void_ptr_t |] in
let recv_char_t : L.lltype =
L.function_type i8_t [| void_ptr_t |] in
let recv_int_func : L.llvalue =
L.declare_function "recv_int" recv_int_t the_module in
let recv_bool_func : L.llvalue =
L.declare_function "recv_bool" recv_bool_t the_module in
let recv_char_func : L.llvalue =
L.declare_function "recv_char" recv_char_t the_module in
let closechan_t : L.lltype =
L.function_type void_t [| void_ptr_t ; i8_t |] in
let closechan_func : L.llvalue =
L.declare_function "closechan" closechan_t the_module in
let clause_member_typs = [| i8_t ; void_ptr_t ; void_ptr_t ; i64_t |] in
let clause_t = L.struct_type context clause_member_typs in
let select_t : L.lltype =
L.function_type i32_t [| L.pointer_type clause_t ; i32_t |] in
let select_func : L.llvalue =
L.declare_function "selectchan" select_t the_module in
let function_arg_structs =
let add_function_arg_struct m fdecl =
let member_typs = Array.of_list (List.map (fun (t, _) -> ltype_of_typ t) fdecl.sformals) in
let struct_t = L.struct_type context member_typs in
StringMap.add fdecl.sfname struct_t m
in
List.fold_left add_function_arg_struct StringMap.empty functions
in
(* Define each function (arguments and return type) so we can
call it even before we've created its body *)
let function_decls : (L.llvalue * sfunc_decl) StringMap.t =
let function_decl m fdecl =
let name = fdecl.sfname in
(* TODO: actually handle the multiple return types. *)
let rt_type = match fdecl.stypes with
[] -> i32_t
| t :: [] -> ltype_of_typ t
| _ -> raise(Failure("Multiple return types not implemented yet")) in
let ftype = L.function_type rt_type [| void_ptr_t |] in
StringMap.add name (L.define_function name ftype the_module, fdecl) m in
List.fold_left function_decl StringMap.empty functions in
(* Fill in the body of the given function *)
let build_function_body fdecl =
let (the_function, _) = StringMap.find fdecl.sfname function_decls in
let builder = L.builder_at_end context (L.entry_block the_function) in
let int_format_str = L.build_global_stringptr "%d\n" "fmt" builder
and char_format_str = L.build_global_stringptr "%c\n" "fmt" builder
and str_format_str = L.build_global_stringptr "%s\n" "fmt" builder in
(* TODO: reevaluate string formatting *)
(* Construct the function's "locals": formal arguments and locally
declared variables. Allocate each on the stack, initialize their
value, if appropriate, and remember their values in the "locals" map *)
let formal_vals =
let args_type = StringMap.find fdecl.sfname function_arg_structs in
let void_ptr = List.hd (Array.to_list (L.params the_function)) in
let ptr = L.build_bitcast void_ptr (L.pointer_type args_type) (fdecl.sfname ^ "_args_ptr") builder in
let args = L.build_load ptr (fdecl.sfname ^ "_args") builder in
let idxs = List.rev (generate_seq ((List.length fdecl.sformals) - 1)) in
let args_list = List.fold_left (fun l idx ->
let arg = L.build_extractvalue args idx (
fdecl.sfname ^ "_arg_" ^ (string_of_int idx)
) builder in arg::l
) [] idxs in
List.rev args_list
in
let local_vars =
let add_formal m (t, n) p =
L.set_value_name n p;
let local =
let create_local (t: A.typ) = match t with
A.Struct(_) as t -> L.build_malloc (ltype_of_typ t) n builder
| _ -> L.build_alloca (ltype_of_typ t) n builder in
create_local t in
ignore (L.build_store p local builder);
StringMap.add n local m
(* Allocate space for any locally declared variables and add the
* resulting registers to our map *)
and add_local m (t, n) =
let local_var = L.build_alloca (ltype_of_typ t) n builder
in StringMap.add n local_var m
in
let formals = List.fold_left2 add_formal StringMap.empty fdecl.sformals
formal_vals in
List.fold_left add_local formals []
in
(* Return the value for a variable or formal argument.
Check local names first, then global names *)
let rec lookup n ml = try StringMap.find n (List.hd ml) with
Not_found -> match List.tl ml with
[] -> raise (Failure("codegen lookup: undeclared reference " ^ n))
| tail -> lookup n tail
in
let defered_el = [] in
let rec svdecl_typ_to_typ : svdecl_typ -> A.typ = function
SInt -> A.Int
| SBool -> A.Bool
| SChar -> A.Char
| SChan(t) -> A.Chan(svdecl_typ_to_typ t)
| SArrayInit(t, _) -> A.Array(svdecl_typ_to_typ t)
| SStruct(s) -> A.Struct(s)
in
let default_value_of_typ (t: A.typ) builder = match t with
A.Int | A.Bool | A.Char -> L.const_int (ltype_of_typ t) 0
| A.Chan(_) -> L.const_pointer_null void_ptr_t
| A.Struct(n) ->
let (member_names, struct_t) = StringMap.find n struct_decls in
let compare_by (n1, _) (n2, _) = compare n1 n2 in
let members = List.sort compare_by
(StringMap.bindings member_names) in
let idxs = List.rev (generate_seq ((List.length members) - 1)) in
let v = List.fold_left2 (fun agg i member ->
let (n, t) = member in
(L.build_insertvalue agg (L.const_int (ltype_of_typ t) 0) i n builder))
(L.const_null struct_t) idxs members in v
| A.Array(t') -> L.const_pointer_null (L.pointer_type (ltype_of_typ t'))
in
(* Construct code for an expression; return its value *)
let rec expr m builder ((_, e) : sexpr) = match e with
SIntLit i -> L.const_int i32_t i
| SStrLit s -> L.build_global_stringptr s "strlit" builder
| SCharLit c -> L.const_int i8_t c
| SBoolLit b -> L.const_int i1_t (if b then 1 else 0)
| SStructLit(sn, ml) ->
let (_, struct_t) = StringMap.find sn struct_decls in
let compare_by (n1, _) (n2, _) = compare n1 n2 in
let sorted_vals = List.map (fun (_, sexpr) -> expr m builder sexpr) (List.sort compare_by ml) in
let idxs = List.rev (generate_seq ((List.length sorted_vals) - 1)) in
let v = List.fold_left2 (fun agg i v ->
L.build_insertvalue agg v i "tmp" builder)
(L.const_null struct_t) idxs sorted_vals in
let local = L.build_malloc struct_t sn builder in
ignore(L.build_store v local builder); local
| SArrLit(t, el) ->
let arr_len = List.length el in
let arr_t = ltype_of_typ t in
let arr = L.build_array_malloc arr_t (L.const_int i32_t arr_len) "arrlit" builder in
let elems = List.map (expr m builder) el in
let idxs = List.rev (generate_seq (List.length el - 1)) in
List.iter2 (fun i elem ->
let arr_ptr = L.build_gep arr [| (L.const_int i32_t i) |] "" builder in
let elem_ptr = L.build_pointercast arr_ptr (L.pointer_type arr_t) "" builder in
ignore(L.build_store elem elem_ptr builder)
) idxs elems; arr
| SNoexpr -> L.const_int i32_t 0
| SId s -> L.build_load (lookup s m) s builder
| SBinop (e1, op, e2) ->
let e1' = expr m builder e1
and e2' = expr m builder e2 in
(match op with
A.Add -> L.build_add
| A.Sub -> L.build_sub
| A.Mult -> L.build_mul
| A.Div -> L.build_sdiv
| A.Mod -> L.build_srem
| A.And -> L.build_and
| A.Or -> L.build_or
| A.Equal -> L.build_icmp L.Icmp.Eq
| A.Less -> L.build_icmp L.Icmp.Slt
| A.Leq -> L.build_icmp L.Icmp.Sle
) e1' e2' "tmp" builder
| SUnop (op, ((_, _) as e)) ->
let e' = expr m builder e in
(match op with
A.Neg -> L.build_neg
| A.Not -> L.build_not) e' "tmp" builder
| SCall ("printi", [e]) ->
L.build_call printf_func [| int_format_str ; (expr m builder e) |]
"printf" builder
| SCall ("printc", [e]) ->
L.build_call printf_func [| char_format_str ; (expr m builder e) |]
"printf" builder
| SCall ("prints", [e]) ->
L.build_call printf_func [| str_format_str ; (expr m builder e) |]
"printf" builder
| SCall ("printb", [e]) ->
L.build_call printbool_func [| (expr m builder e) |]
"printbool" builder
| SCall ("time", _) ->
L.build_call gettime_func [| |]
"get_time" builder
| SCall (f, args) ->
let (fdef, local, result) = construct_func_call f args m builder in
L.build_call fdef [| local |] result builder
| SMake (t, buf) ->
let t_char = typ_to_typ_char t in
let ll_buf = expr m builder buf in
L.build_call makechan_func [| t_char ; ll_buf |] "makechan" builder
| SSend (n, e) ->
let chan = expr m builder n in
let value = expr m builder e in
L.build_call send_func [| chan ; typ_to_typ_char (fst e) ;
L.build_intcast value i32_t "tmp" builder |] "" builder
| SRecv (n, t) ->
let chan = expr m builder n in
let recv_by_typ (t : A.typ) = match t with
A.Int -> L.build_call recv_int_func [| chan |] "recv_int" builder
| A.Bool -> L.build_call recv_bool_func [| chan |] "recv_bool" builder
| A.Char -> L.build_call recv_char_func [| chan |] "recv_int" builder
| _ -> raise(Failure("trying to receive non-basic type from channel; should've checked in parser")) in
recv_by_typ t
| SClose (n, t) ->
let chan = expr m builder n in
L.build_call closechan_func [| chan ; typ_to_typ_char t |] "" builder
| SAccess (sx, sn, mn) ->
let struct_val = expr m builder (A.Struct(sn), sx) in
let (member_names, _) = StringMap.find sn struct_decls in
let compare_by (n1, _) (n2, _) = compare n1 n2 in
let sorted_names = List.map (fun (n, _) -> n) (List.sort compare_by (StringMap.bindings member_names)) in
let name_idx_pairs = List.mapi (fun i n -> (n, i)) sorted_names in
let idx = snd (List.hd (List.filter (fun (n, _) -> n = mn) name_idx_pairs)) in
L.build_extractvalue struct_val idx mn builder
| SSubscript (n, e) ->
let arr = expr m builder (A.Int, SId(n)) in
let idx = expr m builder e in
L.build_load (L.build_gep arr [| idx |] "" builder) "" builder
and
construct_func_call f args m builder =
let (fdef, fdecl) = StringMap.find f function_decls in
let args_t = StringMap.find f function_arg_structs in
let llargs = List.rev (List.map (
fun arg -> match arg with
(_, SStructLit(s, _)) -> let p = expr m builder arg in
L.build_load p (s ^ "_lit") builder
| (_, SStrLit l) ->
let arr_len = (String.length l) + 1 in
let arr_t = (ltype_of_typ A.Char) in
let arr = L.build_array_malloc arr_t (L.const_int i32_t arr_len) "arrlit" builder in
let idxs = List.rev (generate_seq (arr_len - 1)) in
List.iter (fun i ->
let c = (if i = (String.length l) then 0 else Char.code (String.get l i)) in
let elem = L.const_int i8_t c in
let arr_ptr = L.build_gep arr [| (L.const_int i32_t i) |] "" builder in
let elem_ptr = L.build_pointercast arr_ptr (L.pointer_type arr_t) "" builder in
ignore(L.build_store elem elem_ptr builder)
) idxs; arr
| _ -> expr m builder arg
) (List.rev args)) in
let local = L.build_malloc args_t (f ^ "_args") builder in
let idxs = List.rev (generate_seq ((List.length fdecl.sformals) - 1)) in
let args = List.fold_left2 (fun agg i llarg ->
(L.build_insertvalue agg llarg i ("arg_" ^ string_of_int i) builder))
(L.const_null args_t) idxs llargs in
ignore(L.build_store args local builder);
(* TODO: fix multiple return types later *)
let result = (match fdecl.stypes with
[] -> ""
| _ :: [] -> f ^ "_result"
| _ -> raise(Failure("Multiple return types not implemented yet"))) in
let void_ptr_arg = L.build_bitcast local void_ptr_t (f ^ "_arg_pointer") builder in
(fdef, void_ptr_arg, result)
in
(* LLVM insists each basic block end with exactly one "terminator"
instruction that transfers control. This function runs "instr builder"
if the current block does not already have a terminator. Used,
e.g., to handle the "fall off the end of the function" case. *)
let add_terminal builder instr =
match L.block_terminator (L.insertion_block builder) with
Some _ -> ()
| None -> ignore (instr builder) in
(* Build the code for the given statement; return the builder for
the statement's successor (i.e., the next instruction will be built
after the one generated by this call) *)
let rec stmt m dl builder = function
SBlock sl ->
let stmt_list builder ml dl sl =
let helper (bldr, map, dl) = stmt map dl bldr in
let (b, mm, ndl) = List.fold_left helper (builder, ml, dl) sl
in (b, List.tl mm, ndl)
in
stmt_list builder (StringMap.empty::m) dl sl
| SVdeclStmt vdl ->
let declare_var (builder, mm, dl) ((n, t) : (string * svdecl_typ)) =
let store_default_val = function
SInt | SBool | SChar | SChan(_) ->
let local = L.build_alloca (ltype_of_typ (svdecl_typ_to_typ t)) n builder in
let default_value = (default_value_of_typ (svdecl_typ_to_typ t) builder) in
ignore(L.build_store default_value local builder); local
| SStruct(_) ->
let local = L.build_malloc (ltype_of_typ (svdecl_typ_to_typ t)) n builder in
let v = default_value_of_typ (svdecl_typ_to_typ t) builder in
ignore(L.build_store v local builder); local
| SArrayInit(t, e) ->
let array_t = ltype_of_typ (svdecl_typ_to_typ t) in
let array_len = expr m builder e in
let ptr = L.build_array_malloc array_t array_len "" builder in
let local = L.build_alloca (L.pointer_type array_t) n builder in
ignore(L.build_store ptr local builder); local in
let local = store_default_val t in
(* TODO: add to the symbol table?/manage scope? *)
let new_m = StringMap.add n local (List.hd mm)
in (builder, new_m::(List.tl mm), dl)
in List.fold_left declare_var (builder, m, dl) vdl
| SExpr e -> ignore(expr m builder e); (builder, m, dl)
| SReturn e -> (* TODO: fix multiple return types later *)
ignore(List.map (fun (fdef, llargs, result) ->
L.build_call fdef llargs result builder) dl);
ignore(match fdecl.stypes with
(* Special "return nothing" instr *)
[] -> L.build_ret (L.const_int i32_t 0) builder
(* Build return statement *)
| _ :: [] -> L.build_ret (expr m builder (List.hd e)) builder
| _ -> raise(Failure("Multiple return types not implemented yet")));
(builder, m, [])
| SYeet(SCall(f, args)) ->
let (fdef, local, _) = construct_func_call f args m builder in
(* let local_void_ptr = L.build_bitcast local void_ptr_t (f ^ "_arg_ptr") builder in *)
ignore(L.build_call yeet_func [| fdef ; local |] "" builder); (builder, m, dl)
| SAssignStmt s -> let assign_stmt builder = function
SAssign sl ->
let extract_value e = match e with
(_, SStructLit(_, _)) -> let ptr = expr m builder e in
L.build_load ptr "tmp" builder
| (_, SStrLit l) ->
let arr_len = (String.length l) + 1 in
let arr_t = (ltype_of_typ A.Char) in
let arr = L.build_array_malloc arr_t (L.const_int i32_t arr_len) "arrlit" builder in
let idxs = List.rev (generate_seq (arr_len - 1)) in
List.iter (fun i ->
let c = (if i = (String.length l) then 0 else Char.code (String.get l i)) in
let elem = L.const_int i8_t c in
let arr_ptr = L.build_gep arr [| (L.const_int i32_t i) |] "" builder in
let elem_ptr = L.build_pointercast arr_ptr (L.pointer_type arr_t) "" builder in
ignore(L.build_store elem elem_ptr builder)
) idxs; arr
| _ -> expr m builder e
in
let eval_assign_lhs ee e = match ee with
(_, SId(s)) ->
let value = extract_value e in
ignore(L.build_store value (lookup s m) builder); builder
| (_, SSubscript(an, index)) ->
let value = extract_value e in
let arr = L.build_load (lookup an m) "tmp" builder in
let idx = expr m builder index in
let ptr = L.build_gep arr [| idx |] "" builder in
ignore(L.build_store value ptr builder); builder
| (_, SAccess(sx, sn, mn)) ->
let struct_val = expr m builder (A.Struct(sn), sx) in
let (member_names, _) = StringMap.find sn struct_decls in
let compare_by (n1, _) (n2, _) = compare n1 n2 in
let sorted_names = List.map (fun (n, _) -> n) (List.sort compare_by (StringMap.bindings member_names)) in
let name_idx_pairs = List.mapi (fun i n -> (n, i)) sorted_names in
let idx = snd (List.hd (List.filter (fun (n, _) -> n = mn) name_idx_pairs)) in
let e' = expr m builder e in
let v = L.build_insertvalue struct_val e' idx mn builder in
let insert_value sx = match sx with
SId(n) -> L.build_store v (lookup n m) builder
| SSubscript(an, index) ->
let arr = L.build_load (lookup an m) "tmp" builder in
let idx = expr m builder index in
L.build_store v (L.build_gep arr [| idx |] "" builder) builder
| _ -> raise(Failure("invalid access; should've checked in semant!"))
in
ignore(insert_value sx); builder
| _ -> raise(Failure("invalid assign lhs; should've checked in semant!"))
in
ignore(List.map (fun (ee, e) -> eval_assign_lhs ee e) sl); (builder, m, dl)
| SDeclAssign (vdl, assl) -> let (_, mm, dl) = stmt m dl builder (SVdeclStmt vdl) in
let new_assl = List.map (fun (s, e) -> ((svdecl_typ_to_typ (snd (List.hd vdl)), SId(s)), e)) assl in
stmt mm dl builder (SAssignStmt(SAssign(new_assl)))
| SInit dal -> List.fold_left (fun (builder, m, dl) da -> stmt m dl builder(SAssignStmt da)) (builder, m, dl) dal
in assign_stmt builder s
| SIf (predicate, then_stmt, else_stmt) ->
let bool_val = expr m builder predicate in
let merge_bb = L.append_block context "merge" the_function in
let build_br_merge = L.build_br merge_bb in (* partial function *)
let then_bb = L.append_block context "then" the_function in
let (builder1, _, dl) = stmt m dl (L.builder_at_end context then_bb) then_stmt in
add_terminal builder1 build_br_merge;
let else_bb = L.append_block context "else" the_function in
let (builder2, _, dl) = stmt m dl (L.builder_at_end context else_bb) else_stmt in
add_terminal builder2 build_br_merge;
ignore(L.build_cond_br bool_val then_bb else_bb builder);
((L.builder_at_end context merge_bb), m, dl)
| SWhile (predicate, body) ->
let pred_bb = L.append_block context "while" the_function in
ignore(L.build_br pred_bb builder);
let body_bb = L.append_block context "while_body" the_function in
let (builder, mm, dl) = stmt m dl (L.builder_at_end context body_bb) body in
add_terminal builder (L.build_br pred_bb);
let pred_builder = L.builder_at_end context pred_bb in
let bool_val = expr mm pred_builder predicate in
let merge_bb = L.append_block context "merge" the_function in
ignore(L.build_cond_br bool_val body_bb merge_bb pred_builder);
(L.builder_at_end context merge_bb, mm, dl)
| SFor (e1, e2, e3, body) -> stmt m dl builder
( SBlock [e1 ; SWhile (e2, SBlock [body ; e3]) ] )
| SDefer(_, SCall(f, args)) ->
let construct_call = function
"printb" -> (printbool_func, [| (expr m builder (List.hd args)) |], "printbool")
| "prints" -> (printf_func, [| str_format_str ; (expr m builder (List.hd args)) |], "printf")
| "printc" -> (printf_func, [| char_format_str ; (expr m builder (List.hd args)) |], "printf")
| "printi" -> (printf_func, [| int_format_str ; (expr m builder (List.hd args)) |], "printf")
| "time" -> (gettime_func, [| |], "get_time")
| _ ->
let (fdef, local, result) = construct_func_call f args m builder in
(fdef, [| local |], result) in
(builder, m, (construct_call f)::dl)
| SSelect cl ->
(* create array of clause structs *)
let num_elems = List.length cl in
let ptr = L.build_array_malloc clause_t
(L.const_int i32_t num_elems) "" builder
in
let val_ptrs = List.mapi (fun i clause ->
let op = (function
(SSend(_), _) -> L.const_int i8_t (Char.code 's')
| (SRecv(_), _) -> L.const_int i8_t (Char.code 'r')
| _ -> raise(Failure("invalid select clause in codegen"))
) clause in
let chexpr = (function
(SSend(c, _), _) -> c
| (SRecv(c, _), _) -> c
| _ -> raise(Failure("invalid select clause in codegen"))
) clause in
let chan = expr m builder chexpr in
let chtyp = (function
(SSend(_, (t, _)), _) -> t
| (SRecv(_, t), _) -> t
| _ -> raise(Failure("invalid select clause in codegen"))
) clause in
let local = L.build_alloca (ltype_of_typ chtyp) "" builder in
let value = (function
(SSend(_, e), _) -> expr m builder e
| (SRecv(_), _) -> L.const_int (ltype_of_typ chtyp) 0
| _ -> raise(Failure("invalid select clause in codegen"))
) clause in
ignore(L.build_store value local builder);
let void_ptr_val = L.build_bitcast local void_ptr_t "" builder in
let len = L.size_of (ltype_of_typ chtyp) in
let idxs = List.rev (generate_seq (4 - 1)) in
let elem = List.fold_left2 (fun agg i v ->
L.build_insertvalue agg v i "clause" builder)
(L.const_null clause_t) idxs [op ; chan ; void_ptr_val ; len] in
let idx = L.const_int i32_t i in
let eptr = L.build_gep ptr [|idx|] "" builder in
let cptr = L.build_pointercast eptr
(L.pointer_type (L.type_of elem)) "" builder in
let _ = (L.build_store elem cptr builder)
in local) cl
in
(* call C function *)
let selected_clause = L.build_call select_func
[| ptr ; L.const_int i32_t num_elems |] "select" builder
in
(* branch to selected case *)
let merge_bb = L.append_block context "merge" the_function in
let build_br_merge = L.build_br merge_bb in
let (_, case_bbs) = List.fold_left2 (fun (i, cases) clause val_ptr ->
let case_bb = L.append_block context "case" the_function in
let case_stmt, mm = (function
SBlock(SAssignStmt(sass) :: case_block) ->
(* assign received value *)
let e' = L.build_load val_ptr "recv_val" builder in
let rec handle_case_pred = function
SAssign([((_, SId(id)), _)]) ->
ignore(L.build_store e' (lookup id m) builder); m
| SDeclAssign([(id, vdt)], _) ->
let (_, mm, _) = stmt m dl builder (SVdeclStmt [(id, vdt)])
in
ignore(L.build_store e' (lookup id mm) builder); mm
| SInit([sa]) -> handle_case_pred(sa)
| _ -> raise(Failure("invalid case predicate detected in codegen"))
in
let mm = handle_case_pred sass in
SBlock(case_block), mm
| SBlock(_ :: case_block) -> SBlock(case_block), m
| _ -> raise(Failure("internal error: invalid case block in codegen"))
) (snd clause) in
let (builder1, _, _) = stmt mm dl (L.builder_at_end context case_bb)
case_stmt in
add_terminal builder1 build_br_merge;
(i+1, case_bb :: cases))
(0, []) cl val_ptrs in
let sw = L.build_switch selected_clause merge_bb num_elems builder in
List.iteri (fun i case_bb ->
L.add_case sw (L.const_int i32_t i) case_bb;
) (List.rev case_bbs);
((L.builder_at_end context merge_bb), m, dl)
| _ -> raise(Failure("statement not implemented; should've checked in semant!"))
in
(* Build the code for each statement in the function *)
let (builder, _, ndl) = stmt [local_vars ; global_vars] defered_el builder (SBlock fdecl.sbody) in
match L.block_terminator (L.insertion_block builder) with
Some _ -> ()
| None -> ignore(List.map (fun (fdef, llargs, result) ->
L.build_call fdef llargs result builder) ndl);
(* Add a return if the last block falls off the end *)
(* TODO: fix later *)
add_terminal builder (L.build_ret (L.const_int i32_t 0))
(*(match fdecl.styp with
A.Void -> L.build_ret_void
| t -> L.build_ret (L.const_int (ltype_of_typ t) 0))*)
in
ignore(List.iter build_function_body functions);
the_module