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_FORCE_CAST:
 149         case EXPR_IMPLIED_CAST:
 150         case EXPR_SIZEOF:
 151         case EXPR_PTRSIZEOF:
 152         case EXPR_ALIGNOF: {
 153                 struct expression *cast = copy_expression(expr->cast_expression);
 154                 if (cast == expr->cast_expression)
 155                         break;
 156                 expr = dup_expression(expr);
 157                 expr->cast_expression = cast;
 158                 break;
 159         }
 160
 161         /* Conditional expression */
 162         case EXPR_SELECT:
 163         case EXPR_CONDITIONAL: {
 164                 struct expression *cond = copy_expression(expr->conditional);
 165                 struct expression *true = copy_expression(expr->cond_true);
 166                 struct expression *false = copy_expression(expr->cond_false);
 167                 if (cond == expr->conditional && true == expr->cond_true && false == expr->cond_false)
 168                         break;
 169                 expr = dup_expression(expr);
 170                 expr->conditional = cond;
 171                 expr->cond_true = true;
 172                 expr->cond_false = false;
 173                 break;
 174         }
 175
 176         /* Statement expression */
 177         case EXPR_STATEMENT: {
 178                 struct statement *stmt = alloc_statement(expr->pos, STMT_COMPOUND);
 179                 copy_statement(expr->statement, stmt);
 180                 expr = dup_expression(expr);
 181                 expr->statement = stmt;
 182                 break;
 183         }
 184
 185         /* Call expression */
 186         case EXPR_CALL: {
 187                 struct expression *fn = copy_expression(expr->fn);
 188                 struct expression_list *list = expr->args;
 189                 struct expression *arg;
 190
 191                 expr = dup_expression(expr);
 192                 expr->fn = fn;
 193                 expr->args = NULL;
 194                 FOR_EACH_PTR(list, arg) {
 195                         add_expression(&expr->args, copy_expression(arg));
 196                 } END_FOR_EACH_PTR(arg);
 197                 break;
 198         }
 199
 200         /* Initializer list statement */
 201         case EXPR_INITIALIZER: {
 202                 struct expression_list *list = expr->expr_list;
 203                 struct expression *entry;
 204                 expr = dup_expression(expr);
 205                 expr->expr_list = NULL;
 206                 FOR_EACH_PTR(list, entry) {
 207                         add_expression(&expr->expr_list, copy_expression(entry));
 208                 } END_FOR_EACH_PTR(entry);
 209                 break;
 210         }
 211
 212         /* Label in inline function - hmm. */
 213         case EXPR_LABEL: {
 214                 struct symbol *label_symbol = copy_symbol(expr->pos, expr->label_symbol);
 215                 expr = dup_expression(expr);
 216                 expr->label_symbol = label_symbol;
 217                 break;
 218         }
 219
 220         case EXPR_INDEX: {
 221                 struct expression *sub_expr = copy_expression(expr->idx_expression);
 222                 expr = dup_expression(expr);
 223                 expr->idx_expression = sub_expr;
 224                 break;
 225         }
 226
 227         case EXPR_IDENTIFIER: {
 228                 struct expression *sub_expr = copy_expression(expr->ident_expression);
 229                 expr = dup_expression(expr);
 230                 expr->ident_expression = sub_expr;
 231                 break;
 232         }
 233
 234         /* Position in initializer.. */
 235         case EXPR_POS: {
 236                 struct expression *val = copy_expression(expr->init_expr);
 237                 expr = dup_expression(expr);
 238                 expr->init_expr = val;
 239                 break;
 240         }
 241         case EXPR_OFFSETOF: {
 242                 struct expression *val = copy_expression(expr->down);
 243                 if (expr->op == '.') {
 244                         if (expr->down != val) {
 245                                 expr = dup_expression(expr);
 246                                 expr->down = val;
 247                         }
 248                 } else {
 249                         struct expression *idx = copy_expression(expr->index);
 250                         if (expr->down != val || expr->index != idx) {
 251                                 expr = dup_expression(expr);
 252                                 expr->down = val;
 253                                 expr->index = idx;
 254                         }
 255                 }
 256                 break;
 257         }
 258         default:
 259                 warning(expr->pos, "trying to copy expression type %d", expr->type);
 260         }
 261         return expr;
 262 }
 263
 264 static struct expression_list *copy_asm_constraints(struct expression_list *in)
 265 {
 266         struct expression_list *out = NULL;
 267         struct expression *expr;
 268         int state = 0;
 269
 270         FOR_EACH_PTR(in, expr) {
 271                 switch (state) {
 272                 case 0: /* identifier */
 273                 case 1: /* constraint */
 274                         state++;
 275                         add_expression(&out, expr);
 276                         continue;
 277                 case 2: /* expression */
 278                         state = 0;
 279                         add_expression(&out, copy_expression(expr));
 280                         continue;
 281                 }
 282         } END_FOR_EACH_PTR(expr);
 283         return out;
 284 }
 285
 286 static void set_replace(struct symbol *old, struct symbol *new)
 287 {
 288         new->replace = old;
 289         old->replace = new;
 290 }
 291
 292 static void unset_replace(struct symbol *sym)
 293 {
 294         struct symbol *r = sym->replace;
 295         if (!r) {
 296                 warning(sym->pos, "symbol '%s' not replaced?", show_ident(sym->ident));
 297                 return;
 298         }
 299         r->replace = NULL;
 300         sym->replace = NULL;
 301 }
 302
 303 static void unset_replace_list(struct symbol_list *list)
 304 {
 305         struct symbol *sym;
 306         FOR_EACH_PTR(list, sym) {
 307                 unset_replace(sym);
 308         } END_FOR_EACH_PTR(sym);
 309 }
 310
 311 static struct statement *copy_one_statement(struct statement *stmt)
 312 {
 313         if (!stmt)
 314                 return NULL;
 315         switch(stmt->type) {
 316         case STMT_NONE:
 317                 break;
 318         case STMT_DECLARATION: {
 319                 struct symbol *sym;
 320                 struct statement *newstmt = dup_statement(stmt);
 321                 newstmt->declaration = NULL;
 322                 FOR_EACH_PTR(stmt->declaration, sym) {
 323                         struct symbol *newsym = copy_symbol(stmt->pos, sym);
 324                         if (newsym != sym)
 325                                 newsym->initializer = copy_expression(sym->initializer);
 326                         add_symbol(&newstmt->declaration, newsym);
 327                 } END_FOR_EACH_PTR(sym);
 328                 stmt = newstmt;
 329                 break;
 330         }
 331         case STMT_CONTEXT:
 332         case STMT_EXPRESSION: {
 333                 struct expression *expr = copy_expression(stmt->expression);
 334                 if (expr == stmt->expression)
 335                         break;
 336                 stmt = dup_statement(stmt);
 337                 stmt->expression = expr;
 338                 break;
 339         }
 340         case STMT_RANGE: {
 341                 struct expression *expr = copy_expression(stmt->range_expression);
 342                 if (expr == stmt->expression)
 343                         break;
 344                 stmt = dup_statement(stmt);
 345                 stmt->range_expression = expr;
 346                 break;
 347         }
 348         case STMT_COMPOUND: {
 349                 struct statement *new = alloc_statement(stmt->pos, STMT_COMPOUND);
 350                 copy_statement(stmt, new);
 351                 stmt = new;
 352                 break;
 353         }
 354         case STMT_IF: {
 355                 struct expression *cond = stmt->if_conditional;
 356                 struct statement *true = stmt->if_true;
 357                 struct statement *false = stmt->if_false;
 358
 359                 cond = copy_expression(cond);
 360                 true = copy_one_statement(true);
 361                 false = copy_one_statement(false);
 362                 if (stmt->if_conditional == cond &&
 363                     stmt->if_true == true &&
 364                     stmt->if_false == false)
 365                         break;
 366                 stmt = dup_statement(stmt);
 367                 stmt->if_conditional = cond;
 368                 stmt->if_true = true;
 369                 stmt->if_false = false;
 370                 break;
 371         }
 372         case STMT_RETURN: {
 373                 struct expression *retval = copy_expression(stmt->ret_value);
 374                 struct symbol *sym = copy_symbol(stmt->pos, stmt->ret_target);
 375
 376                 stmt = dup_statement(stmt);
 377                 stmt->ret_value = retval;
 378                 stmt->ret_target = sym;
 379                 break;
 380         }
 381         case STMT_CASE: {
 382                 stmt = dup_statement(stmt);
 383                 stmt->case_label = copy_symbol(stmt->pos, stmt->case_label);
 384                 stmt->case_expression = copy_expression(stmt->case_expression);
 385                 stmt->case_to = copy_expression(stmt->case_to);
 386                 stmt->case_statement = copy_one_statement(stmt->case_statement);
 387                 break;
 388         }
 389         case STMT_SWITCH: {
 390                 struct symbol *switch_break = copy_symbol(stmt->pos, stmt->switch_break);
 391                 struct symbol *switch_case = copy_symbol(stmt->pos, stmt->switch_case);
 392                 struct expression *expr = copy_expression(stmt->switch_expression);
 393                 struct statement *switch_stmt = copy_one_statement(stmt->switch_statement);
 394
 395                 stmt = dup_statement(stmt);
 396                 switch_case->symbol_list = copy_symbol_list(switch_case->symbol_list);
 397                 stmt->switch_break = switch_break;
 398                 stmt->switch_case = switch_case;
 399                 stmt->switch_expression = expr;
 400                 stmt->switch_statement = switch_stmt;
 401                 break;
 402         }
 403         case STMT_ITERATOR: {
 404                 stmt = dup_statement(stmt);
 405                 stmt->iterator_break = copy_symbol(stmt->pos, stmt->iterator_break);
 406                 stmt->iterator_continue = copy_symbol(stmt->pos, stmt->iterator_continue);
 407                 stmt->iterator_syms = copy_symbol_list(stmt->iterator_syms);
 408
 409                 stmt->iterator_pre_statement = copy_one_statement(stmt->iterator_pre_statement);
 410                 stmt->iterator_pre_condition = copy_expression(stmt->iterator_pre_condition);
 411
 412                 stmt->iterator_statement = copy_one_statement(stmt->iterator_statement);
 413
 414                 stmt->iterator_post_statement = copy_one_statement(stmt->iterator_post_statement);
 415                 stmt->iterator_post_condition = copy_expression(stmt->iterator_post_condition);
 416                 break;
 417         }
 418         case STMT_LABEL: {
 419                 stmt = dup_statement(stmt);
 420                 stmt->label_identifier = copy_symbol(stmt->pos, stmt->label_identifier);
 421                 stmt->label_statement = copy_one_statement(stmt->label_statement);
 422                 break;
 423         }
 424         case STMT_GOTO: {
 425                 stmt = dup_statement(stmt);
 426                 stmt->goto_label = copy_symbol(stmt->pos, stmt->goto_label);
 427                 stmt->goto_expression = copy_expression(stmt->goto_expression);
 428                 stmt->target_list = copy_symbol_list(stmt->target_list);
 429                 break;
 430         }
 431         case STMT_ASM: {
 432                 stmt = dup_statement(stmt);
 433                 stmt->asm_inputs = copy_asm_constraints(stmt->asm_inputs);
 434                 stmt->asm_outputs = copy_asm_constraints(stmt->asm_outputs);
 435                 /* no need to dup "clobbers", since they are all constant strings */
 436                 break;
 437         }
 438         default:
 439                 warning(stmt->pos, "trying to copy statement type %d", stmt->type);
 440                 break;
 441         }
 442         return stmt;
 443 }
 444
 445 /*
 446  * Copy a statement tree from 'src' to 'dst', where both
 447  * source and destination are of type STMT_COMPOUND.
 448  *
 449  * We do this for the tree-level inliner.
 450  *
 451  * This doesn't do the symbol replacement right: it's not
 452  * re-entrant.
 453  */
 454 void copy_statement(struct statement *src, struct statement *dst)
 455 {
 456         struct statement *stmt;
 457
 458         FOR_EACH_PTR(src->stmts, stmt) {
 459                 add_statement(&dst->stmts, copy_one_statement(stmt));
 460         } END_FOR_EACH_PTR(stmt);
 461         dst->args = copy_one_statement(src->args);
 462         dst->ret = copy_symbol(src->pos, src->ret);
 463         dst->inline_fn = src->inline_fn;
 464 }
 465
 466 static struct symbol *create_copy_symbol(struct symbol *orig)
 467 {
 468         struct symbol *sym = orig;
 469         if (orig) {
 470                 sym = alloc_symbol(orig->pos, orig->type);
 471                 *sym = *orig;
 472                 sym->bb_target = NULL;
 473                 sym->pseudo = NULL;
 474                 set_replace(orig, sym);
 475                 orig = sym;
 476         }
 477         return orig;
 478 }
 479
 480 static struct symbol_list *create_symbol_list(struct symbol_list *src)
 481 {
 482         struct symbol_list *dst = NULL;
 483         struct symbol *sym;
 484
 485         FOR_EACH_PTR(src, sym) {
 486                 struct symbol *newsym = create_copy_symbol(sym);
 487                 add_symbol(&dst, newsym);
 488         } END_FOR_EACH_PTR(sym);
 489         return dst;
 490 }
 491
 492 int inline_function(struct expression *expr, struct symbol *sym)
 493 {
 494         struct symbol_list * fn_symbol_list;
 495         struct symbol *fn = sym->ctype.base_type;
 496         struct expression_list *arg_list = expr->args;
 497         struct statement *stmt = alloc_statement(expr->pos, STMT_COMPOUND);
 498         struct symbol_list *name_list, *arg_decl;
 499         struct symbol *name;
 500         struct expression *arg;
 501
 502         if (!fn->inline_stmt) {
 503                 sparse_error(fn->pos, "marked inline, but without a definition");
 504                 return 0;
 505         }
 506         if (fn->expanding)
 507                 return 0;
 508
 509         fn->expanding = 1;
 510
 511         name_list = fn->arguments;
 512
 513         expr->type = EXPR_STATEMENT;
 514         expr->statement = stmt;
 515         expr->ctype = fn->ctype.base_type;
 516
 517         fn_symbol_list = create_symbol_list(sym->inline_symbol_list);
 518
 519         arg_decl = NULL;
 520         PREPARE_PTR_LIST(name_list, name);
 521         FOR_EACH_PTR(arg_list, arg) {
 522                 struct symbol *a = alloc_symbol(arg->pos, SYM_NODE);
 523
 524                 a->ctype.base_type = arg->ctype;
 525                 if (name) {
 526                         *a = *name;
 527                         set_replace(name, a);
 528                         add_symbol(&fn_symbol_list, a);
 529                 }
 530                 a->initializer = arg;
 531                 add_symbol(&arg_decl, a);
 532
 533                 NEXT_PTR_LIST(name);
 534         } END_FOR_EACH_PTR(arg);
 535         FINISH_PTR_LIST(name);
 536
 537         copy_statement(fn->inline_stmt, stmt);
 538
 539         if (arg_decl) {
 540                 struct statement *decl = alloc_statement(expr->pos, STMT_DECLARATION);
 541                 decl->declaration = arg_decl;
 542                 stmt->args = decl;
 543         }
 544         stmt->inline_fn = sym;
 545
 546         unset_replace_list(fn_symbol_list);
 547
 548         evaluate_statement(stmt);
 549
 550         fn->expanding = 0;
 551         return 1;
 552 }
 553
 554 void uninline(struct symbol *sym)
 555 {
 556         struct symbol *fn = sym->ctype.base_type;
 557         struct symbol_list *arg_list = fn->arguments;
 558         struct symbol *p;
 559
 560         sym->symbol_list = create_symbol_list(sym->inline_symbol_list);
 561         FOR_EACH_PTR(arg_list, p) {
 562                 p->replace = p;
 563         } END_FOR_EACH_PTR(p);
 564         fn->stmt = alloc_statement(fn->pos, STMT_COMPOUND);
 565         copy_statement(fn->inline_stmt, fn->stmt);
 566         unset_replace_list(sym->symbol_list);
 567         unset_replace_list(arg_list);
 568 }