show-parse.c

   1 /*
   2  * sparse/show-parse.c
   3  *
   4  * Copyright (C) 2003 Transmeta Corp.
   5  *
   6  *  Licensed under the Open Software License version 1.1
   7  *
   8  * Print out results of parsing for debugging and testing.
   9  */
  10 #include <stdarg.h>
  11 #include <stdlib.h>
  12 #include <stdio.h>
  13 #include <string.h>
  14 #include <ctype.h>
  15 #include <unistd.h>
  16 #include <fcntl.h>
  17
  18 #include "lib.h"
  19 #include "token.h"
  20 #include "parse.h"
  21 #include "symbol.h"
  22 #include "scope.h"
  23 #include "expression.h"
  24 #include "target.h"
  25
  26 static void do_debug_symbol(struct symbol *sym, int indent)
  27 {
  28         static const char indent_string[] = "                                  ";
  29         static const char *typestr[] = {
  30                 "base", "node", "ptr.", "fn..",
  31                 "arry", "strt", "unin", "enum",
  32                 "tdef", "tpof", "memb", "bitf",
  33                 "labl"
  34         };
  35
  36         if (!sym)
  37                 return;
  38         fprintf(stderr, "%.*s%s%3d:%lu %lx %s (as: %d, context: %x:%x) %p (%s:%d:%d)\n",
  39                 indent, indent_string, typestr[sym->type],
  40                 sym->bit_size, sym->ctype.alignment,
  41                 sym->ctype.modifiers, show_ident(sym->ident),
  42                 sym->ctype.as, sym->ctype.context, sym->ctype.contextmask,
  43                 sym, input_streams[sym->pos.stream].name, sym->pos.line, sym->pos.pos);
  44         if (sym->type == SYM_FN) {
  45                 int i = 1;
  46                 struct symbol *arg;
  47                 FOR_EACH_PTR(sym->arguments, arg) {
  48                         fprintf(stderr, "< arg%d:\n", i);
  49                         do_debug_symbol(arg, 0);
  50                         fprintf(stderr, "  end arg%d >\n", i);
  51                         i++;
  52                 } END_FOR_EACH_PTR;
  53         }
  54         do_debug_symbol(sym->ctype.base_type, indent+2);
  55 }
  56
  57 void debug_symbol(struct symbol *sym)
  58 {
  59         do_debug_symbol(sym, 0);
  60 }
  61
  62 /*
  63  * Symbol type printout. The type system is by far the most
  64  * complicated part of C - everything else is trivial.
  65  */
  66 const char *modifier_string(unsigned long mod)
  67 {
  68         static char buffer[100];
  69         char *p = buffer;
  70         const char *res,**ptr, *names[] = {
  71                 "auto", "register", "static", "extern",
  72                 "const", "volatile", "[signed]", "[unsigned]",
  73                 "[char]", "[short]", "[long]", "[long]",
  74                 "[typdef]", "[structof]", "[unionof]", "[enum]",
  75                 "[typeof]", "[attribute]", "inline", "[addressable]",
  76                 "[nocast]", "[noderef]",
  77                 NULL
  78         };
  79         ptr = names;
  80         while ((res = *ptr++) != NULL) {
  81                 if (mod & 1) {
  82                         char c;
  83                         while ((c = *res++) != '\0')
  84                                 *p++ = c;
  85                         *p++ = ' ';
  86                 }
  87                 mod >>= 1;
  88         }
  89         *p = 0;
  90         return buffer;
  91 }
  92
  93 void show_struct_member(struct symbol *sym, void *data, int flags)
  94 {
  95         if (flags & ITERATE_FIRST)
  96                 printf(" {\n\t");
  97         printf("%s:%d:%ld at offset %ld", show_ident(sym->ident), sym->bit_size, sym->ctype.alignment, sym->offset);
  98         if (sym->fieldwidth)
  99                 printf("[%d..%d]", sym->bit_offset, sym->bit_offset+sym->fieldwidth-1);
 100         if (flags & ITERATE_LAST)
 101                 printf("\n} ");
 102         else
 103                 printf(", ");
 104 }
 105
 106 static void show_one_symbol(struct symbol *sym, void *sep, int flags)
 107 {
 108         show_symbol(sym);
 109         if (!(flags & ITERATE_LAST))
 110                 printf("%s", (const char *)sep);
 111 }
 112
 113 void show_symbol_list(struct symbol_list *list, const char *sep)
 114 {
 115         symbol_iterate(list, show_one_symbol, (void *)sep);
 116 }
 117
 118 struct type_name {
 119         char *start;
 120         char *end;
 121 };
 122
 123 static void prepend(struct type_name *name, const char *fmt, ...)
 124 {
 125         static char buffer[512];
 126         int n;
 127
 128         va_list args;
 129         va_start(args, fmt);
 130         n = vsprintf(buffer, fmt, args);
 131         va_end(args);
 132
 133         name->start -= n;
 134         memcpy(name->start, buffer, n);
 135 }
 136
 137 static void append(struct type_name *name, const char *fmt, ...)
 138 {
 139         static char buffer[512];
 140         int n;
 141
 142         va_list args;
 143         va_start(args, fmt);
 144         n = vsprintf(buffer, fmt, args);
 145         va_end(args);
 146
 147         memcpy(name->end, buffer, n);
 148         name->end += n;
 149 }
 150
 151 static void do_show_type(struct symbol *sym, struct type_name *name)
 152 {
 153         int i, modlen;
 154         const char *mod;
 155         static struct ctype_name {
 156                 struct symbol *sym;
 157                 char *name;
 158         } typenames[] = {
 159                 { & char_ctype,  "char" },
 160                 { &uchar_ctype,  "unsigned char" },
 161                 { & short_ctype, "short" },
 162                 { &ushort_ctype, "unsigned short" },
 163                 { & int_ctype,   "int" },
 164                 { &uint_ctype,   "unsigned int" },
 165                 { & long_ctype,  "long" },
 166                 { &ulong_ctype,  "unsigned long" },
 167                 { & llong_ctype, "long long" },
 168                 { &ullong_ctype, "unsigned long long" },
 169
 170                 { &void_ctype,   "void" },
 171                 { &bool_ctype,   "bool" },
 172                 { &string_ctype, "string" },
 173
 174                 { &float_ctype,  "float" },
 175                 { &double_ctype, "double" },
 176                 { &ldouble_ctype,"long double" },
 177         };
 178
 179         if (!sym)
 180                 return;
 181
 182         for (i = 0; i < sizeof(typenames)/sizeof(typenames[0]); i++) {
 183                 if (typenames[i].sym == sym) {
 184                         int len = strlen(typenames[i].name);
 185                         *--name->start = ' ';
 186                         name->start -= len;
 187                         memcpy(name->start, typenames[i].name, len);
 188                         return;
 189                 }
 190         }
 191
 192         /* Prepend */
 193         switch (sym->type) {
 194         case SYM_PTR:
 195                 prepend(name, "*");
 196                 break;
 197         case SYM_FN:
 198                 prepend(name, "( ");
 199                 break;
 200         case SYM_STRUCT:
 201                 prepend(name, "struct %s ", show_ident(sym->ident));
 202                 return;
 203
 204         case SYM_UNION:
 205                 prepend(name, "union %s ", show_ident(sym->ident));
 206                 return;
 207
 208         case SYM_ENUM:
 209                 prepend(name, "enum %s ", show_ident(sym->ident));
 210                 return;
 211
 212         case SYM_NODE:
 213                 append(name, "%s", show_ident(sym->ident));
 214                 break;
 215
 216         case SYM_BITFIELD:
 217                 append(name, ":%d", sym->fieldwidth);
 218                 break;
 219
 220         case SYM_LABEL:
 221                 append(name, "label(%s:%p)", show_ident(sym->ident), sym);
 222                 break;
 223
 224         case SYM_ARRAY:
 225                 break;
 226
 227         default:
 228                 prepend(name, "unknown type %d", sym->type);
 229                 return;
 230         }
 231
 232         mod = modifier_string(sym->ctype.modifiers);
 233         modlen = strlen(mod);
 234         name->start -= modlen;
 235         memcpy(name->start, mod, modlen);
 236
 237         do_show_type(sym->ctype.base_type, name);
 238
 239         /* Postpend */
 240         if (sym->ctype.as)
 241                 append(name, "<asn:%d>", sym->ctype.as);
 242
 243         switch (sym->type) {
 244         case SYM_PTR:
 245                 return;
 246
 247         case SYM_FN:
 248                 append(name, " )( ... )");
 249                 return;
 250
 251         case SYM_ARRAY:
 252                 append(name, "[%d]", sym->array_size);
 253                 return;
 254         default:
 255                 break;
 256         }
 257 }
 258
 259 void show_type(struct symbol *sym)
 260 {
 261         char array[200];
 262         struct type_name name;
 263
 264         name.start = name.end = array+100;
 265         do_show_type(sym, &name);
 266         *name.end = 0;
 267         printf("%s", name.start);
 268 }
 269
 270 const char *show_typename(struct symbol *sym)
 271 {
 272         static char array[200];
 273         struct type_name name;
 274
 275         name.start = name.end = array+100;
 276         do_show_type(sym, &name);
 277         *name.end = 0;
 278         return name.start;
 279 }
 280
 281 void show_symbol(struct symbol *sym)
 282 {
 283         struct symbol *type;
 284
 285         if (!sym)
 286                 return;
 287
 288         show_type(sym);
 289         type = sym->ctype.base_type;
 290         if (!type)
 291                 return;
 292
 293         /*
 294          * Show actual implementation information
 295          */
 296         switch (type->type) {
 297         case SYM_STRUCT:
 298                 symbol_iterate(type->symbol_list, show_struct_member, NULL);
 299                 break;
 300
 301         case SYM_UNION:
 302                 symbol_iterate(type->symbol_list, show_struct_member, NULL);
 303                 break;
 304
 305         case SYM_FN:
 306                 printf("\n");
 307                 show_statement(type->stmt);
 308                 break;
 309
 310         default:
 311                 break;
 312         }
 313
 314         if (sym->initializer) {
 315                 printf(" = \n");
 316                 show_expression(sym->initializer);
 317         }
 318 }
 319
 320 static int show_return_stmt(struct statement *stmt)
 321 {
 322         struct expression *expr = stmt->expression;
 323
 324         if (expr && expr->ctype) {
 325                 int val = show_expression(expr);
 326                 printf("\tmov.%d\t\tretval,v%d\n",
 327                         expr->ctype->bit_size, val);
 328         }
 329         printf("\tret\n");
 330         return 0;
 331 }
 332
 333 static int show_symbol_init(struct symbol *sym);
 334
 335 static int new_label(void)
 336 {
 337         static int label = 0;
 338         return ++label;
 339 }
 340
 341 /*
 342  * Print out a statement
 343  */
 344 int show_statement(struct statement *stmt)
 345 {
 346         if (!stmt)
 347                 return 0;
 348         switch (stmt->type) {
 349         case STMT_RETURN:
 350                 return show_return_stmt(stmt);
 351         case STMT_COMPOUND: {
 352                 struct symbol *sym;
 353                 struct statement *s;
 354                 int last;
 355
 356                 FOR_EACH_PTR(stmt->syms, sym) {
 357                         show_symbol_init(sym);
 358                 } END_FOR_EACH_PTR;
 359
 360                 FOR_EACH_PTR(stmt->stmts, s) {
 361                         last = show_statement(s);
 362                 } END_FOR_EACH_PTR;
 363                 return last;
 364         }
 365
 366         case STMT_EXPRESSION:
 367                 return show_expression(stmt->expression);
 368         case STMT_IF: {
 369                 int val, target;
 370                 struct expression *cond = stmt->if_conditional;
 371
 372                 if (cond->type == EXPR_VALUE) {
 373                         struct statement *s = stmt->if_true;
 374                         if (!cond->value)
 375                                 s = stmt->if_false;
 376                         show_statement(s);
 377                         break;
 378                 }
 379                 val = show_expression(cond);
 380                 target = new_label();
 381                 printf("\tje\t\tv%d,.L%d\n", val, target);
 382                 show_statement(stmt->if_true);
 383                 if (stmt->if_false) {
 384                         int last = new_label();
 385                         printf("\tjmp\t\t.L%d\n", last);
 386                         printf(".L%d:\n", target);
 387                         target = last;
 388                         show_statement(stmt->if_false);
 389                 }
 390                 printf(".L%d:\n", target);
 391                 break;
 392         }
 393         case STMT_SWITCH: {
 394                 int val = show_expression(stmt->switch_expression);
 395                 printf("\tswitch v%d\n", val);
 396                 show_statement(stmt->switch_statement);
 397                 if (stmt->switch_break->used)
 398                         printf(".L%p:\n", stmt->switch_break);
 399                 break;
 400         }
 401
 402         case STMT_CASE:
 403                 if (!stmt->case_expression)
 404                         printf("default");
 405                 else {
 406                         printf("case %lld", stmt->case_expression->value);
 407                         if (stmt->case_to) {
 408                                 printf("...%lld", stmt->case_to->value);
 409                         }
 410
 411                 }
 412                 printf(":\n");
 413                 show_statement(stmt->case_statement);
 414                 break;
 415
 416         case STMT_ITERATOR: {
 417                 struct statement  *pre_statement = stmt->iterator_pre_statement;
 418                 struct expression *pre_condition = stmt->iterator_pre_condition;
 419                 struct statement  *statement = stmt->iterator_statement;
 420                 struct statement  *post_statement = stmt->iterator_post_statement;
 421                 struct expression *post_condition = stmt->iterator_post_condition;
 422                 int val, loop_top = 0, loop_bottom = 0;
 423
 424                 show_statement(pre_statement);
 425                 if (pre_condition) {
 426                         if (pre_condition->type == EXPR_VALUE) {
 427                                 if (!pre_condition->value)
 428                                         break;
 429                                 pre_condition = NULL;
 430                         } else {
 431                                 loop_bottom = new_label();
 432                                 val = show_expression(pre_condition);
 433                                 printf("\tje\t\tv%d, .L%d\n", val, loop_bottom);
 434                         }
 435                 }
 436                 if (!post_condition || post_condition->type != EXPR_VALUE || post_condition->value)
 437                         loop_top = new_label();
 438                 printf(".L%d:\n", loop_top);
 439                 show_statement(statement);
 440                 if (stmt->iterator_continue->used)
 441                         printf(".L%p:\n", stmt->iterator_continue);
 442                 show_statement(post_statement);
 443                 if (!post_condition) {
 444                         printf("\tjmp\t\t.L%d\n", loop_top);
 445                 } else if (post_condition->type == EXPR_VALUE) {
 446                         if (post_condition->value)
 447                                 printf("\tjmp\t\t.L%d\n", loop_top);
 448                 } else {
 449                         val = show_expression(post_condition);
 450                         printf("\tjne\t\tv%d, .L%d\n", val, loop_top);
 451                 }
 452                 if (stmt->iterator_break->used)
 453                         printf(".L%p:\n", stmt->iterator_break);
 454                 if (pre_condition)
 455                         printf(".L%d:\n", loop_bottom);
 456                 break;
 457         }
 458         case STMT_NONE:
 459                 printf("\t!NONE!\n");
 460                 break;
 461
 462         case STMT_LABEL:
 463                 printf(".L%p:\n", stmt->label_identifier);
 464                 show_statement(stmt->label_statement);
 465                 break;
 466
 467         case STMT_GOTO:
 468                 if (stmt->goto_expression) {
 469                         int val = show_expression(stmt->goto_expression);
 470                         printf("\tgoto *v%d\n", val);
 471                 } else {
 472                         printf("\tgoto .L%p\n", stmt->goto_label);
 473                 }
 474                 break;
 475         case STMT_ASM:
 476                 printf("\tasm( .... )\n");
 477                 break;
 478
 479         }
 480         return 0;
 481 }
 482
 483 static void show_one_statement(struct statement *stmt, void *sep, int flags)
 484 {
 485         show_statement(stmt);
 486         if (!(flags & ITERATE_LAST))
 487                 printf("%s", (const char *)sep);
 488 }
 489
 490 void show_statement_list(struct statement_list *stmt, const char *sep)
 491 {
 492         statement_iterate(stmt, show_one_statement, (void *)sep);
 493 }
 494
 495 static void show_one_expression(struct expression *expr, void *sep, int flags)
 496 {
 497         show_expression(expr);
 498         if (!(flags & ITERATE_LAST))
 499                 printf("%s", (const char *)sep);
 500 }
 501
 502 void show_expression_list(struct expression_list *list, const char *sep)
 503 {
 504         expression_iterate(list, show_one_expression, (void *)sep);
 505 }
 506
 507 static int new_pseudo(void)
 508 {
 509         static int nr = 0;
 510         return ++nr;
 511 }
 512
 513 static int show_call_expression(struct expression *expr)
 514 {
 515         struct symbol *direct;
 516         struct expression *arg, *fn;
 517         int fncall, retval;
 518         int framesize;
 519
 520         if (!expr->ctype) {
 521                 warn(expr->pos, "\tcall with no type!");
 522                 return 0;
 523         }
 524
 525         framesize = 0;
 526         FOR_EACH_PTR_REVERSE(expr->args, arg) {
 527                 int new = show_expression(arg);
 528                 int size = arg->ctype->bit_size;
 529                 printf("\tpush.%d\t\tv%d\n", size, new);
 530                 framesize += size >> 3;
 531         } END_FOR_EACH_PTR;
 532
 533         fn = expr->fn;
 534
 535         /* Remove dereference, if any */
 536         direct = NULL;
 537         if (fn->type == EXPR_PREOP) {
 538                 if (fn->unop->type == EXPR_SYMBOL) {
 539                         struct symbol *sym = fn->unop->symbol;
 540                         if (sym->ctype.base_type->type == SYM_FN)
 541                                 direct = sym;
 542                 }
 543         }
 544         if (direct) {
 545                 printf("\tcall\t\t%s\n", show_ident(direct->ident));
 546         } else {
 547                 fncall = show_expression(fn);
 548                 printf("\tcall\t\t*v%d\n", fncall);
 549         }
 550         if (framesize)
 551                 printf("\tadd.%d\t\tvSP,vSP,$%d\n", BITS_IN_POINTER, framesize);
 552
 553         retval = new_pseudo();
 554         printf("\tmov.%d\t\tv%d,retval\n", expr->ctype->bit_size, retval);
 555         return retval;
 556 }
 557
 558 static int show_binop(struct expression *expr)
 559 {
 560         int left = show_expression(expr->left);
 561         int right = show_expression(expr->right);
 562         int new = new_pseudo();
 563         const char *opname;
 564         static const char *name[] = {
 565                 ['+'] = "add", ['-'] = "sub",
 566                 ['*'] = "mul", ['/'] = "div",
 567                 ['%'] = "mod"
 568         };
 569         unsigned int op = expr->op;
 570
 571         opname = show_special(op);
 572         if (op < sizeof(name)/sizeof(*name))
 573                 opname = name[op];
 574         printf("\t%s.%d\t\tv%d,v%d,v%d\n", opname,
 575                 expr->ctype->bit_size,
 576                 new, left, right);
 577         return new;
 578 }
 579
 580 static int show_regular_preop(struct expression *expr)
 581 {
 582         int target = show_expression(expr->unop);
 583         int new = new_pseudo();
 584         static const char *name[] = {
 585                 ['!'] = "nonzero", ['-'] = "neg",
 586                 ['~'] = "not",
 587         };
 588         unsigned int op = expr->op;
 589         const char *opname;
 590
 591         opname = show_special(op);
 592         if (op < sizeof(name)/sizeof(*name))
 593                 opname = name[op];
 594         printf("\t%s.%d\t\tv%d,v%d\n", opname, expr->ctype->bit_size, new, target);
 595         return new;
 596 }
 597
 598 /*
 599  * FIXME! Not all accesses are memory loads. We should
 600  * check what kind of symbol is behind the dereference.
 601  */
 602 static int show_address_gen(struct expression *expr)
 603 {
 604         if (expr->type == EXPR_PREOP)
 605                 return show_expression(expr->unop);
 606         return show_expression(expr->address);
 607 }
 608
 609 static int show_load_gen(int bits, struct expression *expr, int addr)
 610 {
 611         int new = new_pseudo();
 612
 613         printf("\tld.%d\t\tv%d,[v%d]\n", bits, new, addr);
 614         if (expr->type == EXPR_PREOP)
 615                 return new;
 616
 617         /* bitfield load! */
 618         if (expr->bitpos)
 619                 printf("\tshr.%d\t\tv%d,v%d,$%d\n", bits, new, new, expr->bitpos);
 620         printf("\tandi.%d\t\tv%d,v%d,$%llu\n", bits, new, new, (1ULL << expr->nrbits)-1);
 621         return new;
 622 }
 623
 624 static void show_store_gen(int bits, int value, struct expression *expr, int addr)
 625 {
 626         /* FIXME!!! Bitfield store! */
 627         printf("\tst.%d\t\tv%d,[v%d]\n", bits, value, addr);
 628 }
 629
 630 static int show_assignment(struct expression *expr)
 631 {
 632         struct expression *target = expr->left;
 633         int val, addr, bits;
 634
 635         if (!expr->ctype)
 636                 return 0;
 637
 638         bits = expr->ctype->bit_size;
 639         val = show_expression(expr->right);
 640         addr = show_address_gen(target);
 641         show_store_gen(bits, val, target, addr);
 642         return val;
 643 }
 644
 645 static int show_symbol_expr(struct symbol *sym);
 646
 647 static int show_initialization(struct symbol *sym, struct expression *expr)
 648 {
 649         int val, addr, bits;
 650
 651         if (!expr->ctype)
 652                 return 0;
 653
 654         bits = expr->ctype->bit_size;
 655         val = show_expression(expr);
 656         addr = show_symbol_expr(sym);
 657         // FIXME! The "target" expression is for bitfield store information.
 658         // Leave it NULL, which works fine.
 659         show_store_gen(bits, val, NULL, addr);
 660         return 0;
 661 }
 662
 663 static int show_access(struct expression *expr)
 664 {
 665         int addr = show_address_gen(expr);
 666         return show_load_gen(expr->ctype->bit_size, expr, addr);
 667 }
 668
 669 static int show_inc_dec(struct expression *expr, int postop)
 670 {
 671         int addr = show_address_gen(expr->unop);
 672         int retval, new;
 673         const char *opname = expr->op == SPECIAL_INCREMENT ? "add" : "sub";
 674         int bits = expr->ctype->bit_size;
 675
 676         retval = show_load_gen(bits, expr->unop, addr);
 677         new = retval;
 678         if (postop)
 679                 new = new_pseudo();
 680         printf("\t%s.%d\t\tv%d,v%d,$1\n", opname, bits, new, retval);
 681         show_store_gen(bits, new, expr->unop, addr);
 682         return retval;
 683 }
 684
 685 static int show_preop(struct expression *expr)
 686 {
 687         /*
 688          * '*' is an lvalue access, and is fundamentally different
 689          * from an arithmetic operation. Maybe it should have an
 690          * expression type of its own..
 691          */
 692         if (expr->op == '*')
 693                 return show_access(expr);
 694         if (expr->op == SPECIAL_INCREMENT || expr->op == SPECIAL_DECREMENT)
 695                 return show_inc_dec(expr, 0);
 696         return show_regular_preop(expr);
 697 }
 698
 699 static int show_postop(struct expression *expr)
 700 {
 701         return show_inc_dec(expr, 1);
 702 }
 703
 704 static int show_symbol_expr(struct symbol *sym)
 705 {
 706         int new = new_pseudo();
 707
 708         if (sym->ctype.modifiers & (MOD_TOPLEVEL | MOD_EXTERN | MOD_STATIC)) {
 709                 printf("\tmovi.%d\t\tv%d,$%s\n", BITS_IN_POINTER, new, show_ident(sym->ident));
 710                 return new;
 711         }
 712         if (sym->ctype.modifiers & MOD_ADDRESSABLE) {
 713                 printf("\taddi.%d\t\tv%d,vFP,$%lld\n", BITS_IN_POINTER, new, sym->value);
 714                 return new;
 715         }
 716         printf("\taddi.%d\t\tv%d,vFP,$xxx\n", BITS_IN_POINTER, new);
 717         return new;
 718 }
 719
 720 static int show_symbol_init(struct symbol *sym)
 721 {
 722         struct expression *expr = sym->initializer;
 723
 724         if (expr) {
 725                 int val, addr, bits;
 726
 727                 bits = expr->ctype->bit_size;
 728                 val = show_expression(expr);
 729                 addr = show_symbol_expr(sym);
 730                 show_store_gen(bits, val, NULL, addr);
 731         }
 732         return 0;
 733 }
 734
 735 static int type_is_signed(struct symbol *sym)
 736 {
 737         if (sym->type == SYM_NODE)
 738                 sym = sym->ctype.base_type;
 739         if (sym->type == SYM_PTR)
 740                 return 0;
 741         return !(sym->ctype.modifiers & MOD_UNSIGNED);
 742 }
 743
 744 static int show_cast_expr(struct expression *expr)
 745 {
 746         struct symbol *old_type, *new_type;
 747         int op = show_expression(expr->cast_expression);
 748         int oldbits, newbits;
 749         int new, is_signed;
 750
 751         old_type = expr->cast_expression->ctype;
 752         new_type = expr->cast_type;
 753
 754         oldbits = old_type->bit_size;
 755         newbits = new_type->bit_size;
 756         if (oldbits >= newbits)
 757                 return op;
 758         new = new_pseudo();
 759         is_signed = type_is_signed(old_type);
 760         if (is_signed) {
 761                 printf("\tsext%d.%d\tv%d,v%d\n", oldbits, newbits, new, op);
 762         } else {
 763                 printf("\tandl.%d\t\tv%d,v%d,$%lu\n", newbits, new, op, (1UL << oldbits)-1);
 764         }
 765         return new;
 766 }
 767
 768 static int show_value(struct expression *expr)
 769 {
 770         int new = new_pseudo();
 771         unsigned long long value = expr->value;
 772
 773         printf("\tmovi.%d\t\tv%d,$%llu\n", expr->ctype->bit_size, new, value);
 774         return new;
 775 }
 776
 777 static int show_string_expr(struct expression *expr)
 778 {
 779         int new = new_pseudo();
 780
 781         printf("\tmovi.%d\t\tv%d,&%s\n", BITS_IN_POINTER, new, show_string(expr->string));
 782         return new;
 783 }
 784
 785 static int show_bitfield_expr(struct expression *expr)
 786 {
 787         return show_access(expr);
 788 }
 789
 790 static int show_conditional_expr(struct expression *expr)
 791 {
 792         int cond = show_expression(expr->conditional);
 793         int true = show_expression(expr->cond_true);
 794         int false = show_expression(expr->cond_false);
 795         int new = new_pseudo();
 796
 797         if (!true)
 798                 true = cond;
 799         printf("[v%d]\tcmov.%d\t\tv%d,v%d,v%d\n", cond, expr->ctype->bit_size, new, true, false);
 800         return new;
 801 }
 802
 803 static int show_statement_expr(struct expression *expr)
 804 {
 805         return show_statement(expr->statement);
 806 }
 807
 808 static int show_position_expr(struct expression *expr, struct symbol *base)
 809 {
 810         int new = show_expression(expr->init_expr);
 811         struct symbol *ctype = expr->init_sym;
 812
 813         printf("\tinsert v%d at [%d:%d] of %s\n", new,
 814                 expr->init_offset, ctype->bit_offset,
 815                 show_ident(base->ident));
 816         return 0;
 817 }
 818
 819 static int show_initializer_expr(struct expression *expr, struct symbol *ctype)
 820 {
 821         struct expression *entry;
 822
 823         FOR_EACH_PTR(expr->expr_list, entry) {
 824                 // Nested initializers have their positions already
 825                 // recursively calculated - just output them too
 826                 if (entry->type == EXPR_INITIALIZER) {
 827                         show_initializer_expr(entry, ctype);
 828                         continue;
 829                 }
 830
 831                 // Ignore initializer indexes and identifiers - the
 832                 // evaluator has taken them into account
 833                 if (entry->type == EXPR_IDENTIFIER || entry->type == EXPR_INDEX)
 834                         continue;
 835                 if (entry->type == EXPR_POS) {
 836                         show_position_expr(entry, ctype);
 837                         continue;
 838                 }
 839                 show_initialization(ctype, entry);
 840         } END_FOR_EACH_PTR;
 841         return 0;
 842 }
 843
 844 /*
 845  * Print out an expression. Return the pseudo that contains the
 846  * variable.
 847  */
 848 int show_expression(struct expression *expr)
 849 {
 850         if (!expr)
 851                 return 0;
 852
 853         if (!expr->ctype) {
 854                 struct position *pos = &expr->pos;
 855                 printf("\tno type at %s:%d:%d\n",
 856                         input_streams[pos->stream].name,
 857                         pos->line, pos->pos);
 858                 return 0;
 859         }
 860
 861         switch (expr->type) {
 862         case EXPR_CALL:
 863                 return show_call_expression(expr);
 864
 865         case EXPR_ASSIGNMENT:
 866                 return show_assignment(expr);
 867
 868         case EXPR_BINOP:
 869         case EXPR_COMMA:
 870         case EXPR_COMPARE:
 871         case EXPR_LOGICAL:
 872                 return show_binop(expr);
 873         case EXPR_PREOP:
 874                 return show_preop(expr);
 875         case EXPR_POSTOP:
 876                 return show_postop(expr);
 877         case EXPR_SYMBOL:
 878                 return show_symbol_expr(expr->symbol);
 879         case EXPR_DEREF:
 880         case EXPR_SIZEOF:
 881                 warn(expr->pos, "invalid expression after evaluation");
 882                 return 0;
 883         case EXPR_CAST:
 884                 return show_cast_expr(expr);
 885         case EXPR_VALUE:
 886                 return show_value(expr);
 887         case EXPR_STRING:
 888                 return show_string_expr(expr);
 889         case EXPR_BITFIELD:
 890                 return show_bitfield_expr(expr);
 891         case EXPR_INITIALIZER:
 892                 return show_initializer_expr(expr, expr->ctype);
 893         case EXPR_CONDITIONAL:
 894                 return show_conditional_expr(expr);
 895         case EXPR_STATEMENT:
 896                 return show_statement_expr(expr);
 897
 898         // None of these should exist as direct expressions: they are only
 899         // valid as sub-expressions of initializers.
 900         case EXPR_POS:
 901                 warn(expr->pos, "unable to show plain initializer position expression");
 902                 return 0;
 903         case EXPR_IDENTIFIER:
 904                 warn(expr->pos, "unable to show identifier expression");
 905                 return 0;
 906         case EXPR_INDEX:
 907                 warn(expr->pos, "unable to show index expression");
 908                 return 0;
 909         }
 910         return 0;
 911 }
 912
 913