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 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 const char *fieldspec_str[] = {
  16         [fst] = "fst", [snd] = "snd", [hd] = "hd", [tl] = "tl"};
  17 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                 pindent(indent, out);
 394                 safe_fprintf(out, "}\n");
 395                 break;
 396         default:
 397                 die("Unsupported stmt node\n");
 398         }
 399 }
 400
 401 void expr_print(struct expr *expr, FILE *out)
 402 {
 403         if (expr == NULL)
 404                 return;
 405         char buf[] = "\\xff";
 406         switch(expr->type) {
 407         case ebinop:
 408                 safe_fprintf(out, "(");
 409                 expr_print(expr->data.ebinop.l, out);
 410                 safe_fprintf(out, "%s", binop_str[expr->data.ebinop.op]);
 411                 expr_print(expr->data.ebinop.r, out);
 412                 safe_fprintf(out, ")");
 413                 break;
 414         case ebool:
 415                 safe_fprintf(out, "%s", expr->data.ebool ? "true" : "false");
 416                 break;
 417         case echar:
 418                 safe_fprintf(out, "'%s'",
 419                         escape_char(expr->data.echar, buf, false));
 420                 break;
 421         case efuncall:
 422                 safe_fprintf(out, "%s(", expr->data.efuncall.ident);
 423                 for(int i = 0; i<expr->data.efuncall.nargs; i++) {
 424                         expr_print(expr->data.efuncall.args[i], out);
 425                         if (i+1 < expr->data.efuncall.nargs)
 426                                 safe_fprintf(out, ", ");
 427                 }
 428                 safe_fprintf(out, ")");
 429                 for (int i = 0; i<expr->data.efuncall.nfields; i++)
 430                         fprintf(out, ".%s",
 431                                 fieldspec_str[expr->data.efuncall.fields[i]]);
 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 estring:
 453                 safe_fprintf(out, "\"");
 454                 for (int i = 0; i<expr->data.estring.nchars; i++)
 455                         safe_fprintf(out, "%s", escape_char(
 456                                 expr->data.estring.chars[i], buf, true));
 457                 safe_fprintf(out, "\"");
 458                 break;
 459         case eunop:
 460                 safe_fprintf(out, "(%s", unop_str[expr->data.eunop.op]);
 461                 expr_print(expr->data.eunop.l, out);
 462                 safe_fprintf(out, ")");
 463                 break;
 464         default:
 465                 die("Unsupported expr node\n");
 466         }
 467 }
 468
 469 void type_print(struct type *type, FILE *out)
 470 {
 471         if (type == NULL)
 472                 return;
 473         switch (type->type) {
 474         case tbasic:
 475                 safe_fprintf(out, "%s", basictype_str[type->data.tbasic]);
 476                 break;
 477         case tlist:
 478                 safe_fprintf(out, "[");
 479                 type_print(type->data.tlist, out);
 480                 safe_fprintf(out, "]");
 481                 break;
 482         case ttuple:
 483                 safe_fprintf(out, "(");
 484                 type_print(type->data.ttuple.l, out);
 485                 safe_fprintf(out, ",");
 486                 type_print(type->data.ttuple.r, out);
 487                 safe_fprintf(out, ")");
 488                 break;
 489         case tvar:
 490                 safe_fprintf(out, "%s", type->data.tvar);
 491                 break;
 492         default:
 493                 die("Unsupported type node\n");
 494         }
 495 }
 496
 497 void ast_free(struct ast *ast)
 498 {
 499         if (ast == NULL)
 500                 return;
 501         for (int i = 0; i<ast->ndecls; i++)
 502                 decl_free(ast->decls[i]);
 503         free(ast->decls);
 504         free(ast);
 505 }
 506
 507 void vardecl_free(struct vardecl *decl)
 508 {
 509         type_free(decl->type);
 510         free(decl->ident);
 511         expr_free(decl->expr);
 512         free(decl);
 513 }
 514
 515 void decl_free(struct decl *decl)
 516 {
 517         if (decl == NULL)
 518                 return;
 519         switch(decl->type) {
 520         case dfundecl:
 521                 free(decl->data.dfun.ident);
 522                 for (int i = 0; i<decl->data.dfun.nargs; i++)
 523                         free(decl->data.dfun.args[i]);
 524                 free(decl->data.dfun.args);
 525                 for (int i = 0; i<decl->data.dfun.natypes; i++)
 526                         type_free(decl->data.dfun.atypes[i]);
 527                 free(decl->data.dfun.atypes);
 528                 type_free(decl->data.dfun.rtype);
 529                 for (int i = 0; i<decl->data.dfun.nbody; i++)
 530                         stmt_free(decl->data.dfun.body[i]);
 531                 free(decl->data.dfun.body);
 532                 break;
 533         case dvardecl:
 534                 vardecl_free(decl->data.dvar);
 535                 break;
 536         default:
 537                 die("Unsupported decl node\n");
 538         }
 539         free(decl);
 540 }
 541
 542 void stmt_free(struct stmt *stmt)
 543 {
 544         if (stmt == NULL)
 545                 return;
 546         switch(stmt->type) {
 547         case sassign:
 548                 free(stmt->data.sassign.ident);
 549                 for (int i = 0; i<stmt->data.sassign.nfields; i++)
 550                         free(stmt->data.sassign.fields[i]);
 551                 free(stmt->data.sassign.fields);
 552                 expr_free(stmt->data.sassign.expr);
 553                 break;
 554         case sif:
 555                 expr_free(stmt->data.sif.pred);
 556                 for (int i = 0; i<stmt->data.sif.nthen; i++)
 557                         stmt_free(stmt->data.sif.then[i]);
 558                 free(stmt->data.sif.then);
 559                 for (int i = 0; i<stmt->data.sif.nels; i++)
 560                         stmt_free(stmt->data.sif.els[i]);
 561                 free(stmt->data.sif.els);
 562                 break;
 563         case sreturn:
 564                 expr_free(stmt->data.sreturn);
 565                 break;
 566         case sexpr:
 567                 expr_free(stmt->data.sexpr);
 568                 break;
 569         case swhile:
 570                 expr_free(stmt->data.swhile.pred);
 571                 for (int i = 0; i<stmt->data.swhile.nbody; i++)
 572                         stmt_free(stmt->data.swhile.body[i]);
 573                 free(stmt->data.swhile.body);
 574                 break;
 575         case svardecl:
 576                 vardecl_free(stmt->data.svardecl);
 577                 break;
 578         default:
 579                 die("Unsupported stmt node\n");
 580         }
 581         free(stmt);
 582 }
 583
 584 void expr_free(struct expr *expr)
 585 {
 586         if (expr == NULL)
 587                 return;
 588         switch(expr->type) {
 589         case ebinop:
 590                 expr_free(expr->data.ebinop.l);
 591                 expr_free(expr->data.ebinop.r);
 592                 break;
 593         case ebool:
 594                 break;
 595         case echar:
 596                 break;
 597         case efuncall:
 598                 free(expr->data.efuncall.ident);
 599                 for (int i = 0; i<expr->data.efuncall.nargs; i++)
 600                         expr_free(expr->data.efuncall.args[i]);
 601                 free(expr->data.efuncall.fields);
 602                 free(expr->data.efuncall.args);
 603                 break;
 604         case eint:
 605                 break;
 606         case eident:
 607                 free(expr->data.eident.ident);
 608                 free(expr->data.eident.fields);
 609                 break;
 610         case enil:
 611                 break;
 612         case etuple:
 613                 expr_free(expr->data.etuple.left);
 614                 expr_free(expr->data.etuple.right);
 615                 break;
 616         case estring:
 617                 free(expr->data.estring.chars);
 618                 break;
 619         case eunop:
 620                 expr_free(expr->data.eunop.l);
 621                 break;
 622         default:
 623                 die("Unsupported expr node\n");
 624         }
 625         free(expr);
 626 }
 627
 628 void type_free(struct type *type)
 629 {
 630         if (type == NULL)
 631                 return;
 632         switch (type->type) {
 633         case tbasic:
 634                 break;
 635         case tlist:
 636                 type_free(type->data.tlist);
 637                 break;
 638         case ttuple:
 639                 type_free(type->data.ttuple.l);
 640                 type_free(type->data.ttuple.r);
 641                 break;
 642         case tvar:
 643                 free(type->data.tvar);
 644                 break;
 645         default:
 646                 die("Unsupported type node\n");
 647         }
 648         free(type);
 649 }