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