inline.c

   1 /*
   2  * Sparse - a semantic source parser.
   3  *
   4  * Copyright (C) 2003 Transmeta Corp.
   5  *               2003-2004 Linus Torvalds
   6  *
   7  *  Licensed under the Open Software License version 1.1
   8  */
   9
  10 #include <stdlib.h>
  11 #include <stdio.h>
  12
  13 #include "lib.h"
  14 #include "allocate.h"
  15 #include "token.h"
  16 #include "parse.h"
  17 #include "symbol.h"
  18 #include "expression.h"
  19
  20 static struct expression * dup_expression(struct expression *expr)
  21 {
  22         struct expression *dup = alloc_expression(expr->pos, expr->type);
  23         *dup = *expr;
  24         return dup;
  25 }
  26
  27 static struct statement * dup_statement(struct statement *stmt)
  28 {
  29         struct statement *dup = alloc_statement(stmt->pos, stmt->type);
  30         *dup = *stmt;
  31         return dup;
  32 }
  33
  34 static struct symbol *copy_symbol(struct position pos, struct symbol *sym)
  35 {
  36         if (!sym)
  37                 return sym;
  38         if (sym->ctype.modifiers & (MOD_STATIC | MOD_EXTERN | MOD_TOPLEVEL | MOD_INLINE))
  39                 return sym;
  40         if (!sym->replace) {
  41                 warning(pos, "unreplaced symbol '%s'", show_ident(sym->ident));
  42                 return sym;
  43         }
  44         return sym->replace;
  45 }
  46
  47 static struct symbol_list *copy_symbol_list(struct symbol_list *src)
  48 {
  49         struct symbol_list *dst = NULL;
  50         struct symbol *sym;
  51
  52         FOR_EACH_PTR(src, sym) {
  53                 struct symbol *newsym = copy_symbol(sym->pos, sym);
  54                 add_symbol(&dst, newsym);
  55         } END_FOR_EACH_PTR(sym);
  56         return dst;
  57 }
  58
  59 static struct expression * copy_expression(struct expression *expr)
  60 {
  61         if (!expr)
  62                 return NULL;
  63
  64         switch (expr->type) {
  65         /*
  66          * EXPR_SYMBOL is the interesting case, we may need to replace the
  67          * symbol to the new copy.
  68          */
  69         case EXPR_SYMBOL: {
  70                 struct symbol *sym = copy_symbol(expr->pos, expr->symbol);
  71                 if (sym == expr->symbol)
  72                         break;
  73                 expr = dup_expression(expr);
  74                 expr->symbol = sym;
  75                 break;
  76         }
  77
  78         /* Atomics, never change, just return the expression directly */
  79         case EXPR_VALUE:
  80         case EXPR_STRING:
  81         case EXPR_FVALUE:
  82         case EXPR_TYPE:
  83                 break;
  84
  85         /* Unops: check if the subexpression is unique */
  86         case EXPR_PREOP:
  87         case EXPR_POSTOP: {
  88                 struct expression *unop = copy_expression(expr->unop);
  89                 if (expr->unop == unop)
  90                         break;
  91                 expr = dup_expression(expr);
  92                 expr->unop = unop;
  93                 break;
  94         }
  95
  96         case EXPR_SLICE: {
  97                 struct expression *base = copy_expression(expr->base);
  98                 expr = dup_expression(expr);
  99                 expr->base = base;
 100                 break;
 101         }
 102
 103         /* Binops: copy left/right expressions */
 104         case EXPR_BINOP:
 105         case EXPR_COMMA:
 106         case EXPR_COMPARE:
 107         case EXPR_LOGICAL: {
 108                 struct expression *left = copy_expression(expr->left);
 109                 struct expression *right = copy_expression(expr->right);
 110                 if (left == expr->left && right == expr->right)
 111                         break;
 112                 expr = dup_expression(expr);
 113                 expr->left = left;
 114                 expr->right = right;
 115                 break;
 116         }
 117
 118         case EXPR_ASSIGNMENT: {
 119                 struct expression *left = copy_expression(expr->left);
 120                 struct expression *right = copy_expression(expr->right);
 121                 if (expr->op == '=' && left == expr->left && right == expr->right)
 122                         break;
 123                 expr = dup_expression(expr);
 124                 expr->left = left;
 125                 expr->right = right;
 126                 break;
 127         }
 128
 129         /* Dereference */
 130         case EXPR_DEREF: {
 131                 struct expression *deref = copy_expression(expr->deref);
 132                 expr = dup_expression(expr);
 133                 expr->deref = deref;
 134                 break;
 135         }
 136
 137         /* Cast/sizeof/__alignof__ */
 138         case EXPR_CAST:
 139                 if (expr->cast_expression->type == EXPR_INITIALIZER) {
 140                         struct expression *cast = expr->cast_expression;
 141                         struct symbol *sym = expr->cast_type;
 142                         expr = dup_expression(expr);
 143                         expr->cast_expression = copy_expression(cast);
 144                         expr->cast_type = alloc_symbol(sym->pos, sym->type);
 145                         *expr->cast_type = *sym;
 146                         break;
 147                 }
 148         case EXPR_IMPLIED_CAST:
 149         case EXPR_SIZEOF:
 150         case EXPR_PTRSIZEOF:
 151         case EXPR_ALIGNOF: {
 152                 struct expression *cast = copy_expression(expr->cast_expression);
 153                 if (cast == expr->cast_expression)
 154                         break;
 155                 expr = dup_expression(expr);
 156                 expr->cast_expression = cast;
 157                 break;
 158         }
 159
 160         /* Conditional expression */
 161         case EXPR_SELECT:
 162         case EXPR_CONDITIONAL: {
 163                 struct expression *cond = copy_expression(expr->conditional);
 164                 struct expression *true = copy_expression(expr->cond_true);
 165                 struct expression *false = copy_expression(expr->cond_false);
 166                 if (cond == expr->conditional && true == expr->cond_true && false == expr->cond_false)
 167                         break;
 168                 expr = dup_expression(expr);
 169                 expr->conditional = cond;
 170                 expr->cond_true = true;
 171                 expr->cond_false = false;
 172                 break;
 173         }
 174
 175         /* Statement expression */
 176         case EXPR_STATEMENT: {
 177                 struct statement *stmt = alloc_statement(expr->pos, STMT_COMPOUND);
 178                 copy_statement(expr->statement, stmt);
 179                 expr = dup_expression(expr);
 180                 expr->statement = stmt;
 181                 break;
 182         }
 183
 184         /* Call expression */
 185         case EXPR_CALL: {
 186                 struct expression *fn = copy_expression(expr->fn);
 187                 struct expression_list *list = expr->args;
 188                 struct expression *arg;
 189
 190                 expr = dup_expression(expr);
 191                 expr->fn = fn;
 192                 expr->args = NULL;
 193                 FOR_EACH_PTR(list, arg) {
 194                         add_expression(&expr->args, copy_expression(arg));
 195                 } END_FOR_EACH_PTR(arg);
 196                 break;
 197         }
 198
 199         /* Initializer list statement */
 200         case EXPR_INITIALIZER: {
 201                 struct expression_list *list = expr->expr_list;
 202                 struct expression *entry;
 203                 expr = dup_expression(expr);
 204                 expr->expr_list = NULL;
 205                 FOR_EACH_PTR(list, entry) {
 206                         add_expression(&expr->expr_list, copy_expression(entry));
 207                 } END_FOR_EACH_PTR(entry);
 208                 break;
 209         }
 210
 211         /* Label in inline function - hmm. */
 212         case EXPR_LABEL: {
 213                 struct symbol *label_symbol = copy_symbol(expr->pos, expr->label_symbol);
 214                 expr = dup_expression(expr);
 215                 expr->label_symbol = label_symbol;
 216                 break;
 217         }
 218
 219         case EXPR_INDEX: {
 220                 struct expression *sub_expr = copy_expression(expr->idx_expression);
 221                 if (sub_expr == expr->idx_expression)
 222                         break;
 223                 expr = dup_expression(expr);
 224                 expr->idx_expression = sub_expr;
 225                 break;
 226         }
 227
 228         case EXPR_IDENTIFIER: {
 229                 struct expression *sub_expr = copy_expression(expr->ident_expression);
 230                 expr = dup_expression(expr);
 231                 expr->ident_expression = sub_expr;
 232                 break;
 233         }
 234
 235         /* Position in initializer.. */
 236         case EXPR_POS: {
 237                 struct expression *val = copy_expression(expr->init_expr);
 238                 expr = dup_expression(expr);
 239                 expr->init_expr = val;
 240                 break;
 241         }
 242
 243         default:
 244                 warning(expr->pos, "trying to copy expression type %d", expr->type);
 245         }
 246         return expr;
 247 }
 248
 249 static struct expression_list *copy_asm_constraints(struct expression_list *in)
 250 {
 251         struct expression_list *out = NULL;
 252         struct expression *expr;
 253         int state = 0;
 254
 255         FOR_EACH_PTR(in, expr) {
 256                 switch (state) {
 257                 case 0: /* identifier */
 258                 case 1: /* constraint */
 259                         state++;
 260                         add_expression(&out, expr);
 261                         continue;
 262                 case 2: /* expression */
 263                         state = 0;
 264                         add_expression(&out, copy_expression(expr));
 265                         continue;
 266                 }
 267         } END_FOR_EACH_PTR(expr);
 268         return out;
 269 }
 270
 271 static void set_replace(struct symbol *old, struct symbol *new)
 272 {
 273         new->replace = old;
 274         old->replace = new;
 275 }
 276
 277 static void unset_replace(struct symbol *sym)
 278 {
 279         struct symbol *r = sym->replace;
 280         if (!r) {
 281                 warning(sym->pos, "symbol '%s' not replaced?", show_ident(sym->ident));
 282                 return;
 283         }
 284         r->replace = NULL;
 285         sym->replace = NULL;
 286 }
 287
 288 static void unset_replace_list(struct symbol_list *list)
 289 {
 290         struct symbol *sym;
 291         FOR_EACH_PTR(list, sym) {
 292                 unset_replace(sym);
 293         } END_FOR_EACH_PTR(sym);
 294 }
 295
 296 static struct statement *copy_one_statement(struct statement *stmt)
 297 {
 298         if (!stmt)
 299                 return NULL;
 300         switch(stmt->type) {
 301         case STMT_NONE:
 302                 break;
 303         case STMT_DECLARATION: {
 304                 struct symbol *sym;
 305                 struct statement *newstmt = dup_statement(stmt);
 306                 newstmt->declaration = NULL;
 307                 FOR_EACH_PTR(stmt->declaration, sym) {
 308                         struct symbol *newsym = copy_symbol(stmt->pos, sym);
 309                         if (newsym != sym)
 310                                 newsym->initializer = copy_expression(sym->initializer);
 311                         add_symbol(&newstmt->declaration, newsym);
 312                 } END_FOR_EACH_PTR(sym);
 313                 stmt = newstmt;
 314                 break;
 315         }
 316         case STMT_CONTEXT:
 317         case STMT_EXPRESSION: {
 318                 struct expression *expr = copy_expression(stmt->expression);
 319                 if (expr == stmt->expression)
 320                         break;
 321                 stmt = dup_statement(stmt);
 322                 stmt->expression = expr;
 323                 break;
 324         }
 325         case STMT_RANGE: {
 326                 struct expression *expr = copy_expression(stmt->range_expression);
 327                 if (expr == stmt->expression)
 328                         break;
 329                 stmt = dup_statement(stmt);
 330                 stmt->range_expression = expr;
 331                 break;
 332         }
 333         case STMT_COMPOUND: {
 334                 struct statement *new = alloc_statement(stmt->pos, STMT_COMPOUND);
 335                 copy_statement(stmt, new);
 336                 stmt = new;
 337                 break;
 338         }
 339         case STMT_IF: {
 340                 struct expression *cond = stmt->if_conditional;
 341                 struct statement *true = stmt->if_true;
 342                 struct statement *false = stmt->if_false;
 343
 344                 cond = copy_expression(cond);
 345                 true = copy_one_statement(true);
 346                 false = copy_one_statement(false);
 347                 if (stmt->if_conditional == cond &&
 348                     stmt->if_true == true &&
 349                     stmt->if_false == false)
 350                         break;
 351                 stmt = dup_statement(stmt);
 352                 stmt->if_conditional = cond;
 353                 stmt->if_true = true;
 354                 stmt->if_false = false;
 355                 break;
 356         }
 357         case STMT_RETURN: {
 358                 struct expression *retval = copy_expression(stmt->ret_value);
 359                 struct symbol *sym = copy_symbol(stmt->pos, stmt->ret_target);
 360
 361                 stmt = dup_statement(stmt);
 362                 stmt->ret_value = retval;
 363                 stmt->ret_target = sym;
 364                 break;
 365         }
 366         case STMT_CASE: {
 367                 stmt = dup_statement(stmt);
 368                 stmt->case_label = copy_symbol(stmt->pos, stmt->case_label);
 369                 stmt->case_expression = copy_expression(stmt->case_expression);
 370                 stmt->case_to = copy_expression(stmt->case_to);
 371                 stmt->case_statement = copy_one_statement(stmt->case_statement);
 372                 break;
 373         }
 374         case STMT_SWITCH: {
 375                 struct symbol *switch_break = copy_symbol(stmt->pos, stmt->switch_break);
 376                 struct symbol *switch_case = copy_symbol(stmt->pos, stmt->switch_case);
 377                 struct expression *expr = copy_expression(stmt->switch_expression);
 378                 struct statement *switch_stmt = copy_one_statement(stmt->switch_statement);
 379
 380                 stmt = dup_statement(stmt);
 381                 switch_case->symbol_list = copy_symbol_list(switch_case->symbol_list);
 382                 stmt->switch_break = switch_break;
 383                 stmt->switch_case = switch_case;
 384                 stmt->switch_expression = expr;
 385                 stmt->switch_statement = switch_stmt;
 386                 break;
 387         }
 388         case STMT_ITERATOR: {
 389                 stmt = dup_statement(stmt);
 390                 stmt->iterator_break = copy_symbol(stmt->pos, stmt->iterator_break);
 391                 stmt->iterator_continue = copy_symbol(stmt->pos, stmt->iterator_continue);
 392                 stmt->iterator_syms = copy_symbol_list(stmt->iterator_syms);
 393
 394                 stmt->iterator_pre_statement = copy_one_statement(stmt->iterator_pre_statement);
 395                 stmt->iterator_pre_condition = copy_expression(stmt->iterator_pre_condition);
 396
 397                 stmt->iterator_statement = copy_one_statement(stmt->iterator_statement);
 398
 399                 stmt->iterator_post_statement = copy_one_statement(stmt->iterator_post_statement);
 400                 stmt->iterator_post_condition = copy_expression(stmt->iterator_post_condition);
 401                 break;
 402         }
 403         case STMT_LABEL: {
 404                 stmt = dup_statement(stmt);
 405                 stmt->label_identifier = copy_symbol(stmt->pos, stmt->label_identifier);
 406                 stmt->label_statement = copy_one_statement(stmt->label_statement);
 407                 break;
 408         }
 409         case STMT_GOTO: {
 410                 stmt = dup_statement(stmt);
 411                 stmt->goto_label = copy_symbol(stmt->pos, stmt->goto_label);
 412                 stmt->goto_expression = copy_expression(stmt->goto_expression);
 413                 stmt->target_list = copy_symbol_list(stmt->target_list);
 414                 break;
 415         }
 416         case STMT_ASM: {
 417                 stmt = dup_statement(stmt);
 418                 stmt->asm_inputs = copy_asm_constraints(stmt->asm_inputs);
 419                 stmt->asm_outputs = copy_asm_constraints(stmt->asm_outputs);
 420                 /* no need to dup "clobbers", since they are all constant strings */
 421                 break;
 422         }
 423         default:
 424                 warning(stmt->pos, "trying to copy statement type %d", stmt->type);
 425                 break;
 426         }
 427         return stmt;
 428 }
 429
 430 /*
 431  * Copy a stateemnt tree from 'src' to 'dst', where both
 432  * source and destination are of type STMT_COMPOUND.
 433  *
 434  * We do this for the tree-level inliner.
 435  *
 436  * This doesn't do the symbol replacement right: it's not
 437  * re-entrant.
 438  */
 439 void copy_statement(struct statement *src, struct statement *dst)
 440 {
 441         struct statement *stmt;
 442
 443         FOR_EACH_PTR(src->stmts, stmt) {
 444                 add_statement(&dst->stmts, copy_one_statement(stmt));
 445         } END_FOR_EACH_PTR(stmt);
 446
 447         dst->ret = copy_symbol(src->pos, src->ret);
 448 }
 449
 450 static struct symbol *create_copy_symbol(struct symbol *orig)
 451 {
 452         struct symbol *sym = orig;
 453         if (orig) {
 454                 sym = alloc_symbol(orig->pos, orig->type);
 455                 *sym = *orig;
 456                 sym->bb_target = NULL;
 457                 sym->pseudo = NULL;
 458                 set_replace(orig, sym);
 459                 orig = sym;
 460         }
 461         return orig;
 462 }
 463
 464 static struct symbol_list *create_symbol_list(struct symbol_list *src)
 465 {
 466         struct symbol_list *dst = NULL;
 467         struct symbol *sym;
 468
 469         FOR_EACH_PTR(src, sym) {
 470                 struct symbol *newsym = create_copy_symbol(sym);
 471                 add_symbol(&dst, newsym);
 472         } END_FOR_EACH_PTR(sym);
 473         return dst;
 474 }
 475
 476 int inline_function(struct expression *expr, struct symbol *sym)
 477 {
 478         struct symbol_list * fn_symbol_list;
 479         struct symbol *fn = sym->ctype.base_type;
 480         struct expression_list *arg_list = expr->args;
 481         struct statement *stmt = alloc_statement(expr->pos, STMT_COMPOUND);
 482         struct symbol_list *name_list, *arg_decl;
 483         struct symbol *name;
 484         struct expression *arg;
 485
 486         if (!fn->inline_stmt) {
 487                 sparse_error(fn->pos, "marked inline, but without a definition");
 488                 return 0;
 489         }
 490         if (fn->expanding)
 491                 return 0;
 492         fn->expanding = 1;
 493
 494         name_list = fn->arguments;
 495
 496         expr->type = EXPR_STATEMENT;
 497         expr->statement = stmt;
 498         expr->ctype = fn->ctype.base_type;
 499
 500         fn_symbol_list = create_symbol_list(sym->inline_symbol_list);
 501
 502         arg_decl = NULL;
 503         PREPARE_PTR_LIST(name_list, name);
 504         FOR_EACH_PTR(arg_list, arg) {
 505                 struct symbol *a = alloc_symbol(arg->pos, SYM_NODE);
 506
 507                 a->ctype.base_type = arg->ctype;
 508                 if (name) {
 509                         *a = *name;
 510                         set_replace(name, a);
 511                         add_symbol(&fn_symbol_list, a);
 512                 }
 513                 a->initializer = arg;
 514                 add_symbol(&arg_decl, a);
 515
 516                 NEXT_PTR_LIST(name);
 517         } END_FOR_EACH_PTR(arg);
 518         FINISH_PTR_LIST(name);
 519
 520         if (arg_decl) {
 521                 struct statement *decl = alloc_statement(expr->pos, STMT_DECLARATION);
 522                 decl->declaration = arg_decl;
 523                 add_statement(&stmt->stmts, decl);
 524         }
 525
 526         copy_statement(fn->inline_stmt, stmt);
 527
 528         unset_replace_list(fn_symbol_list);
 529
 530         evaluate_statement(stmt);
 531
 532         fn->expanding = 0;
 533         return 1;
 534 }
 535
 536 void uninline(struct symbol *sym)
 537 {
 538         struct symbol *fn = sym->ctype.base_type;
 539         struct symbol_list *arg_list = fn->arguments;
 540         struct symbol *p;
 541
 542         sym->symbol_list = create_symbol_list(sym->inline_symbol_list);
 543         FOR_EACH_PTR(arg_list, p) {
 544                 p->replace = p;
 545         } END_FOR_EACH_PTR(p);
 546         fn->stmt = alloc_statement(fn->pos, STMT_COMPOUND);
 547         copy_statement(fn->inline_stmt, fn->stmt);
 548         unset_replace_list(sym->symbol_list);
 549         unset_replace_list(arg_list);
 550 }