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