ast.c

   1 #include <stdlib.h>
   2 #include <stdio.h>
   3 #include <string.h>
   4
   5 #include "util.h"
   6 #include "ast.h"
   7 #include "y.tab.h"
   8
   9 static const char *binop_str[] = {
  10         [binor] = "||", [binand] = "&&", [eq] = "==", [neq] = "!=",
  11         [leq] = "<=", [le] = "<", [geq] = ">=", [ge] = ">", [cons] = ":",
  12         [plus] = "+", [minus] = "-", [times] = "*", [divide] = "/",
  13         [modulo] = "%", [power] = "^",
  14 };
  15 static const char *fieldspec_str[] = {
  16         [fst] = "fst", [snd] = "snd", [hd] = "hd", [tl] = "tl"};
  17 static const char *unop_str[] = { [inverse] = "!", [negate] = "-", };
  18 static const char *basictype_str[] = {
  19         [btbool] = "Bool", [btchar] = "Char", [btint] = "Int",
  20         [btvoid] = "Void",
  21 };
  22
  23 struct ast *ast(struct list *decls)
  24 {
  25         struct ast *res = safe_malloc(sizeof(struct ast));
  26         res->decls = (struct decl **)list_to_array(decls, &res->ndecls, true);
  27         return res;
  28 }
  29
  30 struct vardecl *vardecl(struct type *type, char *ident, struct expr *expr)
  31 {
  32         struct vardecl *res = safe_malloc(sizeof(struct vardecl));
  33         res->type = type;
  34         res->ident = ident;
  35         res->expr = expr;
  36         return res;
  37 }
  38
  39 struct decl *decl_fun(char *ident, struct list *args, struct list *atypes,
  40         struct type *rtype, struct list *vars, struct list *body)
  41 {
  42         struct decl *res = safe_malloc(sizeof(struct decl));
  43         res->type = dfundecl;
  44         res->data.dfun.ident = ident;
  45         res->data.dfun.args = (char **)
  46                 list_to_array(args, &res->data.dfun.nargs, true);
  47         res->data.dfun.atypes = (struct type **)
  48                 list_to_array(atypes, &res->data.dfun.natypes, true);
  49         res->data.dfun.rtype = rtype;
  50         res->data.dfun.vars = (struct vardecl **)
  51                 list_to_array(vars, &res->data.dfun.nvar, true);
  52         res->data.dfun.body = (struct stmt **)
  53                 list_to_array(body, &res->data.dfun.nbody, true);
  54         return res;
  55 }
  56
  57 struct decl *decl_var(struct vardecl *vardecl)
  58 {
  59         struct decl *res = safe_malloc(sizeof(struct decl));
  60         res->type = dvardecl;
  61         res->data.dvar = vardecl;
  62         return res;
  63 }
  64
  65 struct stmt *stmt_assign(char *ident, struct expr *expr)
  66 {
  67         struct stmt *res = safe_malloc(sizeof(struct stmt));
  68         res->type = sassign;
  69         res->data.sassign.ident = ident;
  70         res->data.sassign.expr = expr;
  71         return res;
  72 }
  73
  74 struct stmt *stmt_if(struct expr *pred, struct list *then, struct list *els)
  75 {
  76         struct stmt *res = safe_malloc(sizeof(struct stmt));
  77         res->type = sif;
  78         res->data.sif.pred = pred;
  79         res->data.sif.then = (struct stmt **)
  80                 list_to_array(then, &res->data.sif.nthen, true);
  81         res->data.sif.els = (struct stmt **)
  82                 list_to_array(els, &res->data.sif.nels, true);
  83         return res;
  84 }
  85
  86 struct stmt *stmt_return(struct expr *rtrn)
  87 {
  88         struct stmt *res = safe_malloc(sizeof(struct stmt));
  89         res->type = sreturn;
  90         res->data.sreturn = rtrn;
  91         return res;
  92 }
  93
  94 struct stmt *stmt_expr(struct expr *expr)
  95 {
  96         struct stmt *res = safe_malloc(sizeof(struct stmt));
  97         res->type = sexpr;
  98         res->data.sexpr = expr;
  99         return res;
 100 }
 101
 102 struct stmt *stmt_while(struct expr *pred, struct list *body)
 103 {
 104         struct stmt *res = safe_malloc(sizeof(struct stmt));
 105         res->type = swhile;
 106         res->data.swhile.pred = pred;
 107         res->data.swhile.body = (struct stmt **)
 108                 list_to_array(body, &res->data.swhile.nbody, true);
 109         return res;
 110 }
 111
 112 struct expr *expr_binop(struct expr *l, enum binop op, struct expr *r)
 113 {
 114         struct expr *res = safe_malloc(sizeof(struct expr));
 115         res->type = ebinop;
 116         res->data.ebinop.l = l;
 117         res->data.ebinop.op = op;
 118         res->data.ebinop.r = r;
 119         return res;
 120 }
 121
 122 struct expr *expr_bool(bool b)
 123 {
 124         struct expr *res = safe_malloc(sizeof(struct expr));
 125         res->type = ebool;
 126         res->data.ebool = b;
 127         return res;
 128 }
 129 int fromHex(char c)
 130 {
 131         if (c >= '0' && c <= '9')
 132                 return c-'0';
 133         if (c >= 'a' && c <= 'f')
 134                 return c-'a'+10;
 135         if (c >= 'A' && c <= 'F')
 136                 return c-'A'+10;
 137         return -1;
 138 }
 139
 140 struct expr *expr_char(const char *c)
 141 {
 142         struct expr *res = safe_malloc(sizeof(struct expr));
 143         res->type = echar;
 144         //regular char
 145         if (strlen(c) == 3)
 146                 res->data.echar = c[1];
 147         //escape
 148         if (strlen(c) == 4)
 149                 switch(c[2]) {
 150                 case '0': res->data.echar = '\0'; break;
 151                 case 'a': res->data.echar = '\a'; break;
 152                 case 'b': res->data.echar = '\b'; break;
 153                 case 't': res->data.echar = '\t'; break;
 154                 case 'v': res->data.echar = '\v'; break;
 155                 case 'f': res->data.echar = '\f'; break;
 156                 case 'r': res->data.echar = '\r'; break;
 157                 }
 158         //hex escape
 159         if (strlen(c) == 6)
 160                 res->data.echar = (fromHex(c[3])<<4)+fromHex(c[4]);
 161         return res;
 162 }
 163
 164 struct expr *expr_funcall(char *ident, struct list *args)
 165 {
 166         struct expr *res = safe_malloc(sizeof(struct expr));
 167         res->type = efuncall;
 168         res->data.efuncall.ident = ident;
 169         res->data.efuncall.args = (struct expr **)
 170                 list_to_array(args, &res->data.efuncall.nargs, true);
 171         return res;
 172 }
 173
 174 struct expr *expr_int(int integer)
 175 {
 176         struct expr *res = safe_malloc(sizeof(struct expr));
 177         res->type = eint;
 178         res->data.eint = integer;
 179         return res;
 180 }
 181
 182 struct expr *expr_ident(char *ident, struct list *fields)
 183 {
 184         struct expr *res = safe_malloc(sizeof(struct expr));
 185         res->type = eident;
 186         res->data.eident.ident = ident;
 187
 188         void **els = list_to_array(fields, &res->data.eident.nfields, true);
 189         res->data.eident.fields = (enum fieldspec *)safe_malloc(
 190                 res->data.eident.nfields*sizeof(enum fieldspec));
 191         for (int i = 0; i<res->data.eident.nfields; i++) {
 192                 char *t = els[i];
 193                 if (strcmp(t, "fst") == 0)
 194                         res->data.eident.fields[i] = fst;
 195                 else if (strcmp(t, "snd") == 0)
 196                         res->data.eident.fields[i] = snd;
 197                 else if (strcmp(t, "hd") == 0)
 198                         res->data.eident.fields[i] = hd;
 199                 else if (strcmp(t, "tl") == 0)
 200                         res->data.eident.fields[i] = tl;
 201                 free(t);
 202         }
 203         free(els);
 204         return res;
 205 }
 206
 207 struct expr *expr_nil()
 208 {
 209         struct expr *res = safe_malloc(sizeof(struct expr));
 210         res->type = enil;
 211         return res;
 212 }
 213
 214 struct expr *expr_tuple(struct expr *left, struct expr *right)
 215 {
 216         struct expr *res = safe_malloc(sizeof(struct expr));
 217         res->type = etuple;
 218         res->data.etuple.left = left;
 219         res->data.etuple.right = right;
 220         return res;
 221 }
 222
 223 struct expr *expr_unop(enum unop op, struct expr *l)
 224 {
 225         struct expr *res = safe_malloc(sizeof(struct expr));
 226         res->type = eunop;
 227         res->data.eunop.op = op;
 228         res->data.eunop.l = l;
 229         return res;
 230 }
 231
 232 struct type *type_list(struct type *type)
 233 {
 234         struct type *res = safe_malloc(sizeof(struct type));
 235         res->type = tlist;
 236         res->data.tlist = type;
 237         return res;
 238 }
 239
 240 struct type *type_tuple(struct type *l, struct type *r)
 241 {
 242         struct type *res = safe_malloc(sizeof(struct type));
 243         res->type = ttuple;
 244         res->data.ttuple.l = l;
 245         res->data.ttuple.r = r;
 246         return res;
 247 }
 248
 249 struct type *type_var(char *ident)
 250 {
 251         struct type *res = safe_malloc(sizeof(struct type));
 252         if (strcmp(ident, "Int") == 0) {
 253                 res->type = tbasic;
 254                 res->data.tbasic = btint;
 255                 free(ident);
 256         } else if (strcmp(ident, "Char") == 0) {
 257                 res->type = tbasic;
 258                 res->data.tbasic = btchar;
 259                 free(ident);
 260         } else if (strcmp(ident, "Bool") == 0) {
 261                 res->type = tbasic;
 262                 res->data.tbasic = btbool;
 263                 free(ident);
 264         } else if (strcmp(ident, "Void") == 0) {
 265                 res->type = tbasic;
 266                 res->data.tbasic = btvoid;
 267                 free(ident);
 268         } else {
 269                 res->type = tvar;
 270                 res->data.tvar = ident;
 271         }
 272         return res;
 273 }
 274
 275
 276 const char *cescapes[] = {
 277         [0] = "\\0", [1] = "\\x01", [2] = "\\x02", [3] = "\\x03",
 278         [4] = "\\x04", [5] = "\\x05", [6] = "\\x06", [7] = "\\a", [8] = "\\b",
 279         [9] = "\\t", [10] = "\\n", [11] = "\\v", [12] = "\\f", [13] = "\\r",
 280         [14] = "\\x0E", [15] = "\\x0F", [16] = "\\x10", [17] = "\\x11",
 281         [18] = "\\x12", [19] = "\\x13", [20] = "\\x14", [21] = "\\x15",
 282         [22] = "\\x16", [23] = "\\x17", [24] = "\\x18", [25] = "\\x19",
 283         [26] = "\\x1A", [27] = "\\x1B", [28] = "\\x1C", [29] = "\\x1D",
 284         [30] = "\\x1E", [31] = "\\x1F",
 285         [127] = "\\x7F"
 286 };
 287
 288 void ast_print(struct ast *ast, FILE *out)
 289 {
 290         if (ast == NULL)
 291                 return;
 292         for (int i = 0; i<ast->ndecls; i++)
 293                 decl_print(ast->decls[i], 0, out);
 294 }
 295
 296 void vardecl_print(struct vardecl *decl, int indent, FILE *out)
 297 {
 298         pindent(indent, out);
 299         if (decl->type == NULL)
 300                 safe_fprintf(out, "var");
 301         else
 302                 type_print(decl->type, out);
 303         safe_fprintf(out, " %s = ", decl->ident);
 304         expr_print(decl->expr, out);
 305         safe_fprintf(out, ";\n");
 306 }
 307
 308 void decl_print(struct decl *decl, int indent, FILE *out)
 309 {
 310         if (decl == NULL)
 311                 return;
 312         switch(decl->type) {
 313         case dfundecl:
 314                 pindent(indent, out);
 315                 safe_fprintf(out, "%s (", decl->data.dfun.ident);
 316                 for (int i = 0; i<decl->data.dfun.nargs; i++) {
 317                         safe_fprintf(out, "%s", decl->data.dfun.args[i]);
 318                         if (i < decl->data.dfun.nargs - 1)
 319                                 safe_fprintf(out, ", ");
 320                 }
 321                 safe_fprintf(out, ")");
 322                 if (decl->data.dfun.rtype != NULL) {
 323                         safe_fprintf(out, " :: ");
 324                         for (int i = 0; i<decl->data.dfun.natypes; i++) {
 325                                 type_print(decl->data.dfun.atypes[i], out);
 326                                 safe_fprintf(out, " ");
 327                         }
 328                         safe_fprintf(out, "-> ");
 329                         type_print(decl->data.dfun.rtype, out);
 330                 }
 331                 safe_fprintf(out, " {\n");
 332                 for (int i = 0; i<decl->data.dfun.nvar; i++)
 333                         vardecl_print(decl->data.dfun.vars[i], indent+1, out);
 334                 for (int i = 0; i<decl->data.dfun.nbody; i++)
 335                         stmt_print(decl->data.dfun.body[i], indent+1, out);
 336                 pindent(indent, out);
 337                 safe_fprintf(out, "}\n");
 338                 break;
 339         case dvardecl:
 340                 vardecl_print(decl->data.dvar, indent, out);
 341                 break;
 342         default:
 343                 die("Unsupported decl node\n");
 344         }
 345 }
 346
 347 void stmt_print(struct stmt *stmt, int indent, FILE *out)
 348 {
 349         if (stmt == NULL)
 350                 return;
 351         switch(stmt->type) {
 352         case sassign:
 353                 pindent(indent, out);
 354                 fprintf(out, "%s", stmt->data.sassign.ident);
 355                 safe_fprintf(out, " = ");
 356                 expr_print(stmt->data.sassign.expr, out);
 357                 safe_fprintf(out, ";\n");
 358                 break;
 359         case sif:
 360                 pindent(indent, out);
 361                 safe_fprintf(out, "if (");
 362                 expr_print(stmt->data.sif.pred, out);
 363                 safe_fprintf(out, ") {\n");
 364                 for (int i = 0; i<stmt->data.sif.nthen; i++)
 365                         stmt_print(stmt->data.sif.then[i], indent+1, out);
 366                 pindent(indent, out);
 367                 safe_fprintf(out, "} else {\n");
 368                 for (int i = 0; i<stmt->data.sif.nels; i++)
 369                         stmt_print(stmt->data.sif.els[i], indent+1, out);
 370                 pindent(indent, out);
 371                 safe_fprintf(out, "}\n");
 372                 break;
 373         case sreturn:
 374                 pindent(indent, out);
 375                 safe_fprintf(out, "return ");
 376                 expr_print(stmt->data.sreturn, out);
 377                 safe_fprintf(out, ";\n");
 378                 break;
 379         case sexpr:
 380                 pindent(indent, out);
 381                 expr_print(stmt->data.sexpr, out);
 382                 safe_fprintf(out, ";\n");
 383                 break;
 384         case swhile:
 385                 pindent(indent, out);
 386                 safe_fprintf(out, "while (");
 387                 expr_print(stmt->data.swhile.pred, out);
 388                 safe_fprintf(out, ") {\n");
 389                 for (int i = 0; i<stmt->data.swhile.nbody; i++) {
 390                         stmt_print(stmt->data.swhile.body[i], indent+1, out);
 391                 }
 392                 pindent(indent, out);
 393                 safe_fprintf(out, "}\n");
 394                 break;
 395         default:
 396                 die("Unsupported stmt node\n");
 397         }
 398 }
 399
 400 void expr_print(struct expr *expr, FILE *out)
 401 {
 402         if (expr == NULL)
 403                 return;
 404         switch(expr->type) {
 405         case ebinop:
 406                 safe_fprintf(out, "(");
 407                 expr_print(expr->data.ebinop.l, out);
 408                 safe_fprintf(out, "%s", binop_str[expr->data.ebinop.op]);
 409                 expr_print(expr->data.ebinop.r, out);
 410                 safe_fprintf(out, ")");
 411                 break;
 412         case ebool:
 413                 safe_fprintf(out, "%s", expr->data.ebool ? "true" : "false");
 414                 break;
 415         case echar:
 416                 if (expr->data.echar < 0)
 417                         safe_fprintf(out, "'?'");
 418                 if (expr->data.echar < ' ' || expr->data.echar == 127)
 419                         safe_fprintf(out, "'%s'",
 420                                 cescapes[(int)expr->data.echar]);
 421                 else
 422                         safe_fprintf(out, "'%c'", expr->data.echar);
 423                 break;
 424         case efuncall:
 425                 safe_fprintf(out, "%s(", expr->data.efuncall.ident);
 426                 for(int i = 0; i<expr->data.efuncall.nargs; i++) {
 427                         expr_print(expr->data.efuncall.args[i], out);
 428                         if (i+1 < expr->data.efuncall.nargs)
 429                                 safe_fprintf(out, ", ");
 430                 }
 431                 safe_fprintf(out, ")");
 432                 break;
 433         case eint:
 434                 safe_fprintf(out, "%d", expr->data.eint);
 435                 break;
 436         case eident:
 437                 fprintf(out, "%s", expr->data.eident.ident);
 438                 for (int i = 0; i<expr->data.eident.nfields; i++)
 439                         fprintf(out, ".%s",
 440                                 fieldspec_str[expr->data.eident.fields[i]]);
 441                 break;
 442         case enil:
 443                 safe_fprintf(out, "[]");
 444                 break;
 445         case etuple:
 446                 safe_fprintf(out, "(");
 447                 expr_print(expr->data.etuple.left, out);
 448                 safe_fprintf(out, ", ");
 449                 expr_print(expr->data.etuple.right, out);
 450                 safe_fprintf(out, ")");
 451                 break;
 452         case eunop:
 453                 safe_fprintf(out, "(%s", unop_str[expr->data.eunop.op]);
 454                 expr_print(expr->data.eunop.l, out);
 455                 safe_fprintf(out, ")");
 456                 break;
 457         default:
 458                 die("Unsupported expr node\n");
 459         }
 460 }
 461
 462 void type_print(struct type *type, FILE *out)
 463 {
 464         if (type == NULL)
 465                 return;
 466         switch (type->type) {
 467         case tbasic:
 468                 safe_fprintf(out, "%s", basictype_str[type->data.tbasic]);
 469                 break;
 470         case tlist:
 471                 safe_fprintf(out, "[");
 472                 type_print(type->data.tlist, out);
 473                 safe_fprintf(out, "]");
 474                 break;
 475         case ttuple:
 476                 safe_fprintf(out, "(");
 477                 type_print(type->data.ttuple.l, out);
 478                 safe_fprintf(out, ",");
 479                 type_print(type->data.ttuple.r, out);
 480                 safe_fprintf(out, ")");
 481                 break;
 482         case tvar:
 483                 safe_fprintf(out, "%s", type->data.tvar);
 484                 break;
 485         default:
 486                 die("Unsupported type node\n");
 487         }
 488 }
 489
 490 void ast_free(struct ast *ast)
 491 {
 492         if (ast == NULL)
 493                 return;
 494         for (int i = 0; i<ast->ndecls; i++)
 495                 decl_free(ast->decls[i]);
 496         free(ast->decls);
 497         free(ast);
 498 }
 499
 500 void vardecl_free(struct vardecl *decl)
 501 {
 502         type_free(decl->type);
 503         free(decl->ident);
 504         expr_free(decl->expr);
 505         free(decl);
 506 }
 507
 508 void decl_free(struct decl *decl)
 509 {
 510         if (decl == NULL)
 511                 return;
 512         switch(decl->type) {
 513         case dfundecl:
 514                 free(decl->data.dfun.ident);
 515                 for (int i = 0; i<decl->data.dfun.nargs; i++)
 516                         free(decl->data.dfun.args[i]);
 517                 free(decl->data.dfun.args);
 518                 for (int i = 0; i<decl->data.dfun.natypes; i++)
 519                         type_free(decl->data.dfun.atypes[i]);
 520                 free(decl->data.dfun.atypes);
 521                 type_free(decl->data.dfun.rtype);
 522                 for (int i = 0; i<decl->data.dfun.nvar; i++)
 523                         vardecl_free(decl->data.dfun.vars[i]);
 524                 free(decl->data.dfun.vars);
 525                 for (int i = 0; i<decl->data.dfun.nbody; i++)
 526                         stmt_free(decl->data.dfun.body[i]);
 527                 free(decl->data.dfun.body);
 528                 break;
 529         case dvardecl:
 530                 vardecl_free(decl->data.dvar);
 531                 break;
 532         default:
 533                 die("Unsupported decl node\n");
 534         }
 535         free(decl);
 536 }
 537
 538 void stmt_free(struct stmt *stmt)
 539 {
 540         if (stmt == NULL)
 541                 return;
 542         switch(stmt->type) {
 543         case sassign:
 544                 free(stmt->data.sassign.ident);
 545                 expr_free(stmt->data.sassign.expr);
 546                 break;
 547         case sif:
 548                 expr_free(stmt->data.sif.pred);
 549                 for (int i = 0; i<stmt->data.sif.nthen; i++)
 550                         stmt_free(stmt->data.sif.then[i]);
 551                 free(stmt->data.sif.then);
 552                 for (int i = 0; i<stmt->data.sif.nels; i++)
 553                         stmt_free(stmt->data.sif.els[i]);
 554                 free(stmt->data.sif.els);
 555                 break;
 556         case sreturn:
 557                 expr_free(stmt->data.sreturn);
 558                 break;
 559         case sexpr:
 560                 expr_free(stmt->data.sexpr);
 561                 break;
 562         case swhile:
 563                 expr_free(stmt->data.swhile.pred);
 564                 for (int i = 0; i<stmt->data.swhile.nbody; i++)
 565                         stmt_free(stmt->data.swhile.body[i]);
 566                 free(stmt->data.swhile.body);
 567                 break;
 568         default:
 569                 die("Unsupported stmt node\n");
 570         }
 571         free(stmt);
 572 }
 573
 574 void expr_free(struct expr *expr)
 575 {
 576         if (expr == NULL)
 577                 return;
 578         switch(expr->type) {
 579         case ebinop:
 580                 expr_free(expr->data.ebinop.l);
 581                 expr_free(expr->data.ebinop.r);
 582                 break;
 583         case ebool:
 584                 break;
 585         case echar:
 586                 break;
 587         case efuncall:
 588                 free(expr->data.efuncall.ident);
 589                 for (int i = 0; i<expr->data.efuncall.nargs; i++)
 590                         expr_free(expr->data.efuncall.args[i]);
 591                 free(expr->data.efuncall.args);
 592                 break;
 593         case eint:
 594                 break;
 595         case eident:
 596                 free(expr->data.eident.ident);
 597                 free(expr->data.eident.fields);
 598                 break;
 599         case enil:
 600                 break;
 601         case etuple:
 602                 expr_free(expr->data.etuple.left);
 603                 expr_free(expr->data.etuple.right);
 604                 break;
 605         case eunop:
 606                 expr_free(expr->data.eunop.l);
 607                 break;
 608         default:
 609                 die("Unsupported expr node\n");
 610         }
 611         free(expr);
 612 }
 613
 614 void type_free(struct type *type)
 615 {
 616         if (type == NULL)
 617                 return;
 618         switch (type->type) {
 619         case tbasic:
 620                 break;
 621         case tlist:
 622                 type_free(type->data.tlist);
 623                 break;
 624         case ttuple:
 625                 type_free(type->data.ttuple.l);
 626                 type_free(type->data.ttuple.r);
 627                 break;
 628         case tvar:
 629                 free(type->data.tvar);
 630                 break;
 631         default:
 632                 die("Unsupported type node\n");
 633         }
 634         free(type);
 635 }