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 "parse.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 *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.body = (struct stmt **)
  51                 list_to_array(body, &res->data.dfun.nbody, true);
  52         return res;
  53 }
  54
  55 struct decl *decl_var(struct vardecl *vardecl)
  56 {
  57         struct decl *res = safe_malloc(sizeof(struct decl));
  58         res->type = dvardecl;
  59         res->data.dvar = vardecl;
  60         return res;
  61 }
  62
  63 struct stmt *stmt_assign(char *ident, struct list *fields, struct expr *expr)
  64 {
  65         struct stmt *res = safe_malloc(sizeof(struct stmt));
  66         res->type = sassign;
  67         res->data.sassign.ident = ident;
  68         res->data.sassign.fields = (char **)
  69                 list_to_array(fields, &res->data.sassign.nfields, true);
  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_vardecl(struct vardecl *vardecl)
 103 {
 104         struct stmt *res = safe_malloc(sizeof(struct stmt));
 105         res->type = svardecl;
 106         res->data.svardecl = vardecl;
 107         return res;
 108 }
 109
 110 struct stmt *stmt_while(struct expr *pred, struct list *body)
 111 {
 112         struct stmt *res = safe_malloc(sizeof(struct stmt));
 113         res->type = swhile;
 114         res->data.swhile.pred = pred;
 115         res->data.swhile.body = (struct stmt **)
 116                 list_to_array(body, &res->data.swhile.nbody, true);
 117         return res;
 118 }
 119
 120 struct expr *expr_binop(struct expr *l, enum binop op, struct expr *r)
 121 {
 122         struct expr *res = safe_malloc(sizeof(struct expr));
 123         res->type = ebinop;
 124         res->data.ebinop.l = l;
 125         res->data.ebinop.op = op;
 126         res->data.ebinop.r = r;
 127         return res;
 128 }
 129
 130 struct expr *expr_bool(bool b)
 131 {
 132         struct expr *res = safe_malloc(sizeof(struct expr));
 133         res->type = ebool;
 134         res->data.ebool = b;
 135         return res;
 136 }
 137
 138 struct expr *expr_char(char *c)
 139 {
 140         struct expr *res = safe_malloc(sizeof(struct expr));
 141         res->type = echar;
 142         res->data.echar = unescape_char(c)[0];
 143         return res;
 144 }
 145
 146 static void set_fields(enum fieldspec **farray, int *n, struct list *fields)
 147 {
 148         void **els = list_to_array(fields, n, true);
 149         *farray = (enum fieldspec *)safe_malloc(*n*sizeof(enum fieldspec));
 150         for (int i = 0; i<*n; i++) {
 151                 char *t = els[i];
 152                 if (strcmp(t, "fst") == 0)
 153                         (*farray)[i] = fst;
 154                 else if (strcmp(t, "snd") == 0)
 155                         (*farray)[i] = snd;
 156                 else if (strcmp(t, "hd") == 0)
 157                         (*farray)[i] = hd;
 158                 else if (strcmp(t, "tl") == 0)
 159                         (*farray)[i] = tl;
 160                 free(t);
 161         }
 162         free(els);
 163 }
 164
 165
 166 struct expr *expr_funcall(char *ident, struct list *args, struct list *fields)
 167 {
 168         struct expr *res = safe_malloc(sizeof(struct expr));
 169         res->type = efuncall;
 170         res->data.efuncall.ident = ident;
 171         res->data.efuncall.args = (struct expr **)
 172                 list_to_array(args, &res->data.efuncall.nargs, true);
 173         set_fields(&res->data.efuncall.fields,
 174                 &res->data.efuncall.nfields, fields);
 175         return res;
 176 }
 177
 178 struct expr *expr_int(int integer)
 179 {
 180         struct expr *res = safe_malloc(sizeof(struct expr));
 181         res->type = eint;
 182         res->data.eint = integer;
 183         return res;
 184 }
 185
 186 struct expr *expr_ident(char *ident, struct list *fields)
 187 {
 188         struct expr *res = safe_malloc(sizeof(struct expr));
 189         res->type = eident;
 190         res->data.eident.ident = ident;
 191         set_fields(&res->data.eident.fields, &res->data.eident.nfields, fields);
 192         return res;
 193 }
 194
 195 struct expr *expr_nil()
 196 {
 197         struct expr *res = safe_malloc(sizeof(struct expr));
 198         res->type = enil;
 199         return res;
 200 }
 201
 202 struct expr *expr_tuple(struct expr *left, struct expr *right)
 203 {
 204         struct expr *res = safe_malloc(sizeof(struct expr));
 205         res->type = etuple;
 206         res->data.etuple.left = left;
 207         res->data.etuple.right = right;
 208         return res;
 209 }
 210
 211 struct expr *expr_string(char *str)
 212 {
 213         struct expr *res = safe_malloc(sizeof(struct expr));
 214         res->type = estring;
 215         res->data.estring.nchars = 0;
 216         res->data.estring.chars = safe_malloc(strlen(str)+1);
 217         char *p = res->data.estring.chars;
 218         while(*str != '\0') {
 219                 str = unescape_char(str);
 220                 *p++ = *str++;
 221                 res->data.estring.nchars++;
 222         }
 223         *p = '\0';
 224         return res;
 225 }
 226
 227 struct expr *expr_unop(enum unop op, struct expr *l)
 228 {
 229         struct expr *res = safe_malloc(sizeof(struct expr));
 230         res->type = eunop;
 231         res->data.eunop.op = op;
 232         res->data.eunop.l = l;
 233         return res;
 234 }
 235
 236 struct type *type_basic(enum basictype type)
 237 {
 238         struct type *res = safe_malloc(sizeof(struct type));
 239         res->type = tbasic;
 240         res->data.tbasic = type;
 241         return res;
 242 }
 243
 244 struct type *type_list(struct type *type)
 245 {
 246         struct type *res = safe_malloc(sizeof(struct type));
 247         res->type = tlist;
 248         res->data.tlist = type;
 249         return res;
 250 }
 251
 252 struct type *type_tuple(struct type *l, struct type *r)
 253 {
 254         struct type *res = safe_malloc(sizeof(struct type));
 255         res->type = ttuple;
 256         res->data.ttuple.l = l;
 257         res->data.ttuple.r = r;
 258         return res;
 259 }
 260
 261 struct type *type_var(char *ident)
 262 {
 263         struct type *res = safe_malloc(sizeof(struct type));
 264         if (strcmp(ident, "Int") == 0) {
 265                 res->type = tbasic;
 266                 res->data.tbasic = btint;
 267                 free(ident);
 268         } else if (strcmp(ident, "Char") == 0) {
 269                 res->type = tbasic;
 270                 res->data.tbasic = btchar;
 271                 free(ident);
 272         } else if (strcmp(ident, "Bool") == 0) {
 273                 res->type = tbasic;
 274                 res->data.tbasic = btbool;
 275                 free(ident);
 276         } else if (strcmp(ident, "Void") == 0) {
 277                 res->type = tbasic;
 278                 res->data.tbasic = btvoid;
 279                 free(ident);
 280         } else {
 281                 res->type = tvar;
 282                 res->data.tvar = ident;
 283         }
 284         return res;
 285 }
 286
 287 void ast_print(struct ast *ast, FILE *out)
 288 {
 289         if (ast == NULL)
 290                 return;
 291         for (int i = 0; i<ast->ndecls; i++)
 292                 decl_print(ast->decls[i], 0, out);
 293 }
 294
 295 void vardecl_print(struct vardecl *decl, int indent, FILE *out)
 296 {
 297         pindent(indent, out);
 298         if (decl->type == NULL)
 299                 safe_fprintf(out, "var");
 300         else
 301                 type_print(decl->type, out);
 302         safe_fprintf(out, " %s = ", decl->ident);
 303         expr_print(decl->expr, out);
 304         safe_fprintf(out, ";\n");
 305 }
 306
 307 void decl_print(struct decl *decl, int indent, FILE *out)
 308 {
 309         if (decl == NULL)
 310                 return;
 311         switch(decl->type) {
 312         case dfundecl:
 313                 pindent(indent, out);
 314                 safe_fprintf(out, "%s (", decl->data.dfun.ident);
 315                 for (int i = 0; i<decl->data.dfun.nargs; i++) {
 316                         safe_fprintf(out, "%s", decl->data.dfun.args[i]);
 317                         if (i < decl->data.dfun.nargs - 1)
 318                                 safe_fprintf(out, ", ");
 319                 }
 320                 safe_fprintf(out, ")");
 321                 if (decl->data.dfun.rtype != NULL) {
 322                         safe_fprintf(out, " :: ");
 323                         for (int i = 0; i<decl->data.dfun.natypes; i++) {
 324                                 type_print(decl->data.dfun.atypes[i], out);
 325                                 safe_fprintf(out, " ");
 326                         }
 327                         safe_fprintf(out, "-> ");
 328                         type_print(decl->data.dfun.rtype, out);
 329                 }
 330                 safe_fprintf(out, " {\n");
 331                 for (int i = 0; i<decl->data.dfun.nbody; i++)
 332                         stmt_print(decl->data.dfun.body[i], indent+1, out);
 333                 pindent(indent, out);
 334                 safe_fprintf(out, "}\n");
 335                 break;
 336         case dvardecl:
 337                 vardecl_print(decl->data.dvar, indent, out);
 338                 break;
 339         default:
 340                 die("Unsupported decl node\n");
 341         }
 342 }
 343
 344 void stmt_print(struct stmt *stmt, int indent, FILE *out)
 345 {
 346         if (stmt == NULL)
 347                 return;
 348         switch(stmt->type) {
 349         case sassign:
 350                 pindent(indent, out);
 351                 fprintf(out, "%s", stmt->data.sassign.ident);
 352                 for (int i = 0; i<stmt->data.sassign.nfields; i++)
 353                         fprintf(out, ".%s", stmt->data.sassign.fields[i]);
 354                 safe_fprintf(out, " = ");
 355                 expr_print(stmt->data.sassign.expr, out);
 356                 safe_fprintf(out, ";\n");
 357                 break;
 358         case sif:
 359                 pindent(indent, out);
 360                 safe_fprintf(out, "if (");
 361                 expr_print(stmt->data.sif.pred, out);
 362                 safe_fprintf(out, ") {\n");
 363                 for (int i = 0; i<stmt->data.sif.nthen; i++)
 364                         stmt_print(stmt->data.sif.then[i], indent+1, out);
 365                 pindent(indent, out);
 366                 safe_fprintf(out, "} else {\n");
 367                 for (int i = 0; i<stmt->data.sif.nels; i++)
 368                         stmt_print(stmt->data.sif.els[i], indent+1, out);
 369                 pindent(indent, out);
 370                 safe_fprintf(out, "}\n");
 371                 break;
 372         case sreturn:
 373                 pindent(indent, out);
 374                 safe_fprintf(out, "return ");
 375                 expr_print(stmt->data.sreturn, out);
 376                 safe_fprintf(out, ";\n");
 377                 break;
 378         case sexpr:
 379                 pindent(indent, out);
 380                 expr_print(stmt->data.sexpr, out);
 381                 safe_fprintf(out, ";\n");
 382                 break;
 383         case svardecl:
 384                 vardecl_print(stmt->data.svardecl, indent, out);
 385                 break;
 386         case swhile:
 387                 pindent(indent, out);
 388                 safe_fprintf(out, "while (");
 389                 expr_print(stmt->data.swhile.pred, out);
 390                 safe_fprintf(out, ") {\n");
 391                 for (int i = 0; i<stmt->data.swhile.nbody; i++) {
 392                         stmt_print(stmt->data.swhile.body[i], indent+1, out);
 393                 }
 394                 pindent(indent, out);
 395                 safe_fprintf(out, "}\n");
 396                 break;
 397         default:
 398                 die("Unsupported stmt node\n");
 399         }
 400 }
 401
 402 void expr_print(struct expr *expr, FILE *out)
 403 {
 404         if (expr == NULL)
 405                 return;
 406         char buf[] = "\\xff";
 407         switch(expr->type) {
 408         case ebinop:
 409                 safe_fprintf(out, "(");
 410                 expr_print(expr->data.ebinop.l, out);
 411                 safe_fprintf(out, "%s", binop_str[expr->data.ebinop.op]);
 412                 expr_print(expr->data.ebinop.r, out);
 413                 safe_fprintf(out, ")");
 414                 break;
 415         case ebool:
 416                 safe_fprintf(out, "%s", expr->data.ebool ? "true" : "false");
 417                 break;
 418         case echar:
 419                 safe_fprintf(out, "'%s'",
 420                         escape_char(expr->data.echar, buf, false));
 421                 break;
 422         case efuncall:
 423                 safe_fprintf(out, "%s(", expr->data.efuncall.ident);
 424                 for(int i = 0; i<expr->data.efuncall.nargs; i++) {
 425                         expr_print(expr->data.efuncall.args[i], out);
 426                         if (i+1 < expr->data.efuncall.nargs)
 427                                 safe_fprintf(out, ", ");
 428                 }
 429                 safe_fprintf(out, ")");
 430                 for (int i = 0; i<expr->data.efuncall.nfields; i++)
 431                         fprintf(out, ".%s",
 432                                 fieldspec_str[expr->data.efuncall.fields[i]]);
 433                 break;
 434         case eint:
 435                 safe_fprintf(out, "%d", expr->data.eint);
 436                 break;
 437         case eident:
 438                 fprintf(out, "%s", expr->data.eident.ident);
 439                 for (int i = 0; i<expr->data.eident.nfields; i++)
 440                         fprintf(out, ".%s",
 441                                 fieldspec_str[expr->data.eident.fields[i]]);
 442                 break;
 443         case enil:
 444                 safe_fprintf(out, "[]");
 445                 break;
 446         case etuple:
 447                 safe_fprintf(out, "(");
 448                 expr_print(expr->data.etuple.left, out);
 449                 safe_fprintf(out, ", ");
 450                 expr_print(expr->data.etuple.right, out);
 451                 safe_fprintf(out, ")");
 452                 break;
 453         case estring:
 454                 safe_fprintf(out, "\"");
 455                 for (int i = 0; i<expr->data.estring.nchars; i++)
 456                         safe_fprintf(out, "%s", escape_char(
 457                                 expr->data.estring.chars[i], buf, true));
 458                 safe_fprintf(out, "\"");
 459                 break;
 460         case eunop:
 461                 safe_fprintf(out, "(%s", unop_str[expr->data.eunop.op]);
 462                 expr_print(expr->data.eunop.l, out);
 463                 safe_fprintf(out, ")");
 464                 break;
 465         default:
 466                 die("Unsupported expr node\n");
 467         }
 468 }
 469
 470 void type_print(struct type *type, FILE *out)
 471 {
 472         if (type == NULL)
 473                 return;
 474         switch (type->type) {
 475         case tbasic:
 476                 safe_fprintf(out, "%s", basictype_str[type->data.tbasic]);
 477                 break;
 478         case tlist:
 479                 safe_fprintf(out, "[");
 480                 type_print(type->data.tlist, out);
 481                 safe_fprintf(out, "]");
 482                 break;
 483         case ttuple:
 484                 safe_fprintf(out, "(");
 485                 type_print(type->data.ttuple.l, out);
 486                 safe_fprintf(out, ",");
 487                 type_print(type->data.ttuple.r, out);
 488                 safe_fprintf(out, ")");
 489                 break;
 490         case tvar:
 491                 safe_fprintf(out, "%s", type->data.tvar);
 492                 break;
 493         default:
 494                 die("Unsupported type node\n");
 495         }
 496 }
 497
 498 void ast_free(struct ast *ast)
 499 {
 500         if (ast == NULL)
 501                 return;
 502         for (int i = 0; i<ast->ndecls; i++)
 503                 decl_free(ast->decls[i]);
 504         free(ast->decls);
 505         free(ast);
 506 }
 507
 508 void vardecl_free(struct vardecl *decl)
 509 {
 510         type_free(decl->type);
 511         free(decl->ident);
 512         expr_free(decl->expr);
 513         free(decl);
 514 }
 515
 516 void decl_free(struct decl *decl)
 517 {
 518         if (decl == NULL)
 519                 return;
 520         switch(decl->type) {
 521         case dfundecl:
 522                 free(decl->data.dfun.ident);
 523                 for (int i = 0; i<decl->data.dfun.nargs; i++)
 524                         free(decl->data.dfun.args[i]);
 525                 free(decl->data.dfun.args);
 526                 for (int i = 0; i<decl->data.dfun.natypes; i++)
 527                         type_free(decl->data.dfun.atypes[i]);
 528                 free(decl->data.dfun.atypes);
 529                 type_free(decl->data.dfun.rtype);
 530                 for (int i = 0; i<decl->data.dfun.nbody; i++)
 531                         stmt_free(decl->data.dfun.body[i]);
 532                 free(decl->data.dfun.body);
 533                 break;
 534         case dvardecl:
 535                 vardecl_free(decl->data.dvar);
 536                 break;
 537         default:
 538                 die("Unsupported decl node\n");
 539         }
 540         free(decl);
 541 }
 542
 543 void stmt_free(struct stmt *stmt)
 544 {
 545         if (stmt == NULL)
 546                 return;
 547         switch(stmt->type) {
 548         case sassign:
 549                 free(stmt->data.sassign.ident);
 550                 for (int i = 0; i<stmt->data.sassign.nfields; i++)
 551                         free(stmt->data.sassign.fields[i]);
 552                 free(stmt->data.sassign.fields);
 553                 expr_free(stmt->data.sassign.expr);
 554                 break;
 555         case sif:
 556                 expr_free(stmt->data.sif.pred);
 557                 for (int i = 0; i<stmt->data.sif.nthen; i++)
 558                         stmt_free(stmt->data.sif.then[i]);
 559                 free(stmt->data.sif.then);
 560                 for (int i = 0; i<stmt->data.sif.nels; i++)
 561                         stmt_free(stmt->data.sif.els[i]);
 562                 free(stmt->data.sif.els);
 563                 break;
 564         case sreturn:
 565                 expr_free(stmt->data.sreturn);
 566                 break;
 567         case sexpr:
 568                 expr_free(stmt->data.sexpr);
 569                 break;
 570         case swhile:
 571                 expr_free(stmt->data.swhile.pred);
 572                 for (int i = 0; i<stmt->data.swhile.nbody; i++)
 573                         stmt_free(stmt->data.swhile.body[i]);
 574                 free(stmt->data.swhile.body);
 575                 break;
 576         case svardecl:
 577                 vardecl_free(stmt->data.svardecl);
 578                 break;
 579         default:
 580                 die("Unsupported stmt node\n");
 581         }
 582         free(stmt);
 583 }
 584
 585 void expr_free(struct expr *expr)
 586 {
 587         if (expr == NULL)
 588                 return;
 589         switch(expr->type) {
 590         case ebinop:
 591                 expr_free(expr->data.ebinop.l);
 592                 expr_free(expr->data.ebinop.r);
 593                 break;
 594         case ebool:
 595                 break;
 596         case echar:
 597                 break;
 598         case efuncall:
 599                 free(expr->data.efuncall.ident);
 600                 for (int i = 0; i<expr->data.efuncall.nargs; i++)
 601                         expr_free(expr->data.efuncall.args[i]);
 602                 free(expr->data.efuncall.fields);
 603                 free(expr->data.efuncall.args);
 604                 break;
 605         case eint:
 606                 break;
 607         case eident:
 608                 free(expr->data.eident.ident);
 609                 free(expr->data.eident.fields);
 610                 break;
 611         case enil:
 612                 break;
 613         case etuple:
 614                 expr_free(expr->data.etuple.left);
 615                 expr_free(expr->data.etuple.right);
 616                 break;
 617         case estring:
 618                 free(expr->data.estring.chars);
 619                 break;
 620         case eunop:
 621                 expr_free(expr->data.eunop.l);
 622                 break;
 623         default:
 624                 die("Unsupported expr node\n");
 625         }
 626         free(expr);
 627 }
 628
 629 void type_free(struct type *type)
 630 {
 631         if (type == NULL)
 632                 return;
 633         switch (type->type) {
 634         case tbasic:
 635                 break;
 636         case tlist:
 637                 type_free(type->data.tlist);
 638                 break;
 639         case ttuple:
 640                 type_free(type->data.ttuple.l);
 641                 type_free(type->data.ttuple.r);
 642                 break;
 643         case tvar:
 644                 free(type->data.tvar);
 645                 break;
 646         default:
 647                 die("Unsupported type node\n");
 648         }
 649         free(type);
 650 }