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         case EXPR_IMPLIED_CAST:
 139         case EXPR_SIZEOF:
 140         case EXPR_PTRSIZEOF:
 141         case EXPR_ALIGNOF: {
 142                 struct expression *cast = copy_expression(expr->cast_expression);
 143                 if (cast == expr->cast_expression)
 144                         break;
 145                 expr = dup_expression(expr);
 146                 expr->cast_expression = cast;
 147                 break;
 148         }
 149
 150         /* Conditional expression */
 151         case EXPR_SELECT:
 152         case EXPR_CONDITIONAL: {
 153                 struct expression *cond = copy_expression(expr->conditional);
 154                 struct expression *true = copy_expression(expr->cond_true);
 155                 struct expression *false = copy_expression(expr->cond_false);
 156                 if (cond == expr->conditional && true == expr->cond_true && false == expr->cond_false)
 157                         break;
 158                 expr = dup_expression(expr);
 159                 expr->conditional = cond;
 160                 expr->cond_true = true;
 161                 expr->cond_false = false;
 162                 break;
 163         }
 164
 165         /* Statement expression */
 166         case EXPR_STATEMENT: {
 167                 struct statement *stmt = alloc_statement(expr->pos, STMT_COMPOUND);
 168                 copy_statement(expr->statement, stmt);
 169                 expr = dup_expression(expr);
 170                 expr->statement = stmt;
 171                 break;
 172         }
 173
 174         /* Call expression */
 175         case EXPR_CALL: {
 176                 struct expression *fn = copy_expression(expr->fn);
 177                 struct expression_list *list = expr->args;
 178                 struct expression *arg;
 179
 180                 expr = dup_expression(expr);
 181                 expr->fn = fn;
 182                 expr->args = NULL;
 183                 FOR_EACH_PTR(list, arg) {
 184                         add_expression(&expr->args, copy_expression(arg));
 185                 } END_FOR_EACH_PTR(arg);
 186                 break;
 187         }
 188
 189         /* Initializer list statement */
 190         case EXPR_INITIALIZER: {
 191                 struct expression_list *list = expr->expr_list;
 192                 struct expression *entry;
 193                 expr = dup_expression(expr);
 194                 expr->expr_list = NULL;
 195                 FOR_EACH_PTR(list, entry) {
 196                         add_expression(&expr->expr_list, copy_expression(entry));
 197                 } END_FOR_EACH_PTR(entry);
 198                 break;
 199         }
 200
 201         /* Label in inline function - hmm. */
 202         case EXPR_LABEL: {
 203                 struct symbol *label_symbol = copy_symbol(expr->pos, expr->label_symbol);
 204                 expr = dup_expression(expr);
 205                 expr->label_symbol = label_symbol;
 206                 break;
 207         }
 208
 209         case EXPR_INDEX: {
 210                 struct expression *sub_expr = copy_expression(expr->idx_expression);
 211                 if (sub_expr == expr->idx_expression)
 212                         break;
 213                 expr = dup_expression(expr);
 214                 expr->idx_expression = sub_expr;
 215                 break;
 216         }
 217
 218         case EXPR_IDENTIFIER: {
 219                 struct expression *sub_expr = copy_expression(expr->ident_expression);
 220                 expr = dup_expression(expr);
 221                 expr->ident_expression = sub_expr;
 222                 break;
 223         }
 224
 225         /* Position in initializer.. */
 226         case EXPR_POS: {
 227                 struct expression *val = copy_expression(expr->init_expr);
 228                 expr = dup_expression(expr);
 229                 expr->init_expr = val;
 230                 break;
 231         }
 232
 233         default:
 234                 warning(expr->pos, "trying to copy expression type %d", expr->type);
 235         }
 236         return expr;
 237 }
 238
 239 static struct expression_list *copy_asm_constraints(struct expression_list *in)
 240 {
 241         struct expression_list *out = NULL;
 242         struct expression *expr;
 243         int state = 0;
 244
 245         FOR_EACH_PTR(in, expr) {
 246                 switch (state) {
 247                 case 0: /* identifier */
 248                 case 1: /* constraint */
 249                         state++;
 250                         add_expression(&out, expr);
 251                         continue;
 252                 case 2: /* expression */
 253                         state = 0;
 254                         add_expression(&out, copy_expression(expr));
 255                         continue;
 256                 }
 257         } END_FOR_EACH_PTR(expr);
 258         return out;
 259 }
 260
 261 void set_replace(struct symbol *old, struct symbol *new)
 262 {
 263         new->replace = old;
 264         old->replace = new;
 265 }
 266
 267 void unset_replace(struct symbol *sym)
 268 {
 269         struct symbol *r = sym->replace;
 270         if (!r) {
 271                 warning(sym->pos, "symbol '%s' not replaced?", show_ident(sym->ident));
 272                 return;
 273         }
 274         r->replace = NULL;
 275         sym->replace = NULL;
 276 }
 277
 278 static void unset_replace_list(struct symbol_list *list)
 279 {
 280         struct symbol *sym;
 281         FOR_EACH_PTR(list, sym) {
 282                 unset_replace(sym);
 283         } END_FOR_EACH_PTR(sym);
 284 }
 285
 286 static struct statement *copy_one_statement(struct statement *stmt)
 287 {
 288         if (!stmt)
 289                 return NULL;
 290         switch(stmt->type) {
 291         case STMT_NONE:
 292                 break;
 293         case STMT_CONTEXT:
 294         case STMT_EXPRESSION: {
 295                 struct expression *expr = copy_expression(stmt->expression);
 296                 if (expr == stmt->expression)
 297                         break;
 298                 stmt = dup_statement(stmt);
 299                 stmt->expression = expr;
 300                 break;
 301         }
 302         case STMT_RANGE: {
 303                 struct expression *expr = copy_expression(stmt->range_expression);
 304                 if (expr == stmt->expression)
 305                         break;
 306                 stmt = dup_statement(stmt);
 307                 stmt->range_expression = expr;
 308                 break;
 309         }
 310         case STMT_COMPOUND: {
 311                 struct statement *new = alloc_statement(stmt->pos, STMT_COMPOUND);
 312                 copy_statement(stmt, new);
 313                 stmt = new;
 314                 break;
 315         }
 316         case STMT_IF: {
 317                 struct expression *cond = stmt->if_conditional;
 318                 struct statement *true = stmt->if_true;
 319                 struct statement *false = stmt->if_false;
 320
 321                 cond = copy_expression(cond);
 322                 true = copy_one_statement(true);
 323                 false = copy_one_statement(false);
 324                 if (stmt->if_conditional == cond &&
 325                     stmt->if_true == true &&
 326                     stmt->if_false == false)
 327                         break;
 328                 stmt = dup_statement(stmt);
 329                 stmt->if_conditional = cond;
 330                 stmt->if_true = true;
 331                 stmt->if_false = false;
 332                 break;
 333         }
 334         case STMT_RETURN: {
 335                 struct expression *retval = copy_expression(stmt->ret_value);
 336                 struct symbol *sym = copy_symbol(stmt->pos, stmt->ret_target);
 337
 338                 stmt = dup_statement(stmt);
 339                 stmt->ret_value = retval;
 340                 stmt->ret_target = sym;
 341                 break;
 342         }
 343         case STMT_CASE: {
 344                 stmt = dup_statement(stmt);
 345                 stmt->case_label = copy_symbol(stmt->pos, stmt->case_label);
 346                 stmt->case_expression = copy_expression(stmt->case_expression);
 347                 stmt->case_to = copy_expression(stmt->case_to);
 348                 stmt->case_statement = copy_one_statement(stmt->case_statement);
 349                 break;
 350         }
 351         case STMT_SWITCH: {
 352                 struct symbol *switch_break = copy_symbol(stmt->pos, stmt->switch_break);
 353                 struct symbol *switch_case = copy_symbol(stmt->pos, stmt->switch_case);
 354                 struct expression *expr = copy_expression(stmt->switch_expression);
 355                 struct statement *switch_stmt = copy_one_statement(stmt->switch_statement);
 356
 357                 stmt = dup_statement(stmt);
 358                 switch_case->symbol_list = copy_symbol_list(switch_case->symbol_list);
 359                 stmt->switch_break = switch_break;
 360                 stmt->switch_case = switch_case;
 361                 stmt->switch_expression = expr;
 362                 stmt->switch_statement = switch_stmt;
 363                 break;
 364         }
 365         case STMT_ITERATOR: {
 366                 stmt = dup_statement(stmt);
 367                 stmt->iterator_break = copy_symbol(stmt->pos, stmt->iterator_break);
 368                 stmt->iterator_continue = copy_symbol(stmt->pos, stmt->iterator_continue);
 369                 stmt->iterator_syms = copy_symbol_list(stmt->iterator_syms);
 370
 371                 stmt->iterator_pre_statement = copy_one_statement(stmt->iterator_pre_statement);
 372                 stmt->iterator_pre_condition = copy_expression(stmt->iterator_pre_condition);
 373
 374                 stmt->iterator_statement = copy_one_statement(stmt->iterator_statement);
 375
 376                 stmt->iterator_post_statement = copy_one_statement(stmt->iterator_post_statement);
 377                 stmt->iterator_post_condition = copy_expression(stmt->iterator_post_condition);
 378                 break;
 379         }
 380         case STMT_LABEL: {
 381                 stmt = dup_statement(stmt);
 382                 stmt->label_identifier = copy_symbol(stmt->pos, stmt->label_identifier);
 383                 stmt->label_statement = copy_one_statement(stmt->label_statement);
 384                 break;
 385         }
 386         case STMT_GOTO: {
 387                 stmt = dup_statement(stmt);
 388                 stmt->goto_label = copy_symbol(stmt->pos, stmt->goto_label);
 389                 stmt->goto_expression = copy_expression(stmt->goto_expression);
 390                 stmt->target_list = copy_symbol_list(stmt->target_list);
 391                 break;
 392         }
 393         case STMT_ASM: {
 394                 stmt = dup_statement(stmt);
 395                 stmt->asm_inputs = copy_asm_constraints(stmt->asm_inputs);
 396                 stmt->asm_outputs = copy_asm_constraints(stmt->asm_outputs);
 397                 /* no need to dup "clobbers", since they are all constant strings */
 398                 break;
 399         }
 400         default:
 401                 warning(stmt->pos, "trying to copy statement type %d", stmt->type);
 402                 break;
 403         }
 404         return stmt;
 405 }
 406
 407 /*
 408  * Copy a stateemnt tree from 'src' to 'dst', where both
 409  * source and destination are of type STMT_COMPOUND.
 410  *
 411  * We do this for the tree-level inliner.
 412  *
 413  * This doesn't do the symbol replacement right: it's not
 414  * re-entrant.
 415  */
 416 void copy_statement(struct statement *src, struct statement *dst)
 417 {
 418         struct statement *stmt;
 419         struct symbol *sym;
 420
 421         FOR_EACH_PTR(src->syms, sym) {
 422                 struct symbol *newsym = copy_symbol(src->pos, sym);
 423                 if (newsym != sym)
 424                         newsym->initializer = copy_expression(sym->initializer);
 425                 add_symbol(&dst->syms, newsym);
 426         } END_FOR_EACH_PTR(sym);
 427
 428         FOR_EACH_PTR(src->stmts, stmt) {
 429                 add_statement(&dst->stmts, copy_one_statement(stmt));
 430         } END_FOR_EACH_PTR(stmt);
 431
 432         dst->ret = copy_symbol(src->pos, src->ret);
 433 }
 434
 435 static struct symbol *create_copy_symbol(struct symbol *orig)
 436 {
 437         struct symbol *sym = orig;
 438         if (orig) {
 439                 sym = alloc_symbol(orig->pos, orig->type);
 440                 *sym = *orig;
 441                 sym->bb_target = NULL;
 442                 sym->pseudo = NULL;
 443                 set_replace(orig, sym);
 444                 orig = sym;
 445         }
 446         return orig;
 447 }
 448
 449 static struct symbol_list *create_symbol_list(struct symbol_list *src)
 450 {
 451         struct symbol_list *dst = NULL;
 452         struct symbol *sym;
 453
 454         FOR_EACH_PTR(src, sym) {
 455                 struct symbol *newsym = create_copy_symbol(sym);
 456                 add_symbol(&dst, newsym);
 457         } END_FOR_EACH_PTR(sym);
 458         return dst;
 459 }
 460
 461 int inline_function(struct expression *expr, struct symbol *sym)
 462 {
 463         struct symbol_list * fn_symbol_list;
 464         struct symbol *fn = sym->ctype.base_type;
 465         struct expression_list *arg_list = expr->args;
 466         struct statement *stmt = alloc_statement(expr->pos, STMT_COMPOUND);
 467         struct symbol_list *name_list;
 468         struct symbol *name;
 469         struct expression *arg;
 470
 471         if (!fn->inline_stmt) {
 472                 warning(fn->pos, "marked inline, but without a definition");
 473                 return 0;
 474         }
 475         if (fn->expanding)
 476                 return 0;
 477         fn->expanding = 1;
 478
 479         name_list = fn->arguments;
 480
 481         expr->type = EXPR_STATEMENT;
 482         expr->statement = stmt;
 483         expr->ctype = fn->ctype.base_type;
 484
 485         fn_symbol_list = create_symbol_list(sym->inline_symbol_list);
 486
 487         PREPARE_PTR_LIST(name_list, name);
 488         FOR_EACH_PTR(arg_list, arg) {
 489                 struct symbol *a = alloc_symbol(arg->pos, SYM_NODE);
 490
 491                 a->ctype.base_type = arg->ctype;
 492                 if (name) {
 493                         *a = *name;
 494                         set_replace(name, a);
 495                         add_symbol(&fn_symbol_list, a);
 496                 }
 497                 a->initializer = arg;
 498                 add_symbol(&stmt->syms, a);
 499
 500                 NEXT_PTR_LIST(name);
 501         } END_FOR_EACH_PTR(arg);
 502         FINISH_PTR_LIST(name);
 503
 504         copy_statement(fn->inline_stmt, stmt);
 505
 506         unset_replace_list(fn_symbol_list);
 507
 508         evaluate_statement(stmt);
 509
 510         fn->expanding = 0;
 511         return 1;
 512 }
 513
 514 void uninline(struct symbol *sym)
 515 {
 516         struct symbol *fn = sym->ctype.base_type;
 517         struct symbol_list *arg_list = fn->arguments;
 518         struct symbol *p;
 519
 520         sym->symbol_list = create_symbol_list(sym->inline_symbol_list);
 521         FOR_EACH_PTR(arg_list, p) {
 522                 p->replace = p;
 523         } END_FOR_EACH_PTR(p);
 524         fn->stmt = alloc_statement(fn->pos, STMT_COMPOUND);
 525         copy_statement(fn->inline_stmt, fn->stmt);
 526         unset_replace_list(sym->symbol_list);
 527         unset_replace_list(arg_list);
 528 }