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