inline.c

   1 /*
   2  * Sparse - a semantic source parser.
   3  *
   4  * Copyright (C) 2003 Transmeta Corp.
   5  *               2003 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 "token.h"
  15 #include "parse.h"
  16 #include "symbol.h"
  17 #include "expression.h"
  18
  19 static struct expression * dup_expression(struct expression *expr)
  20 {
  21         struct expression *dup = alloc_expression(expr->pos, expr->type);
  22         *dup = *expr;
  23         return dup;
  24 }
  25
  26 static struct statement * dup_statement(struct statement *stmt)
  27 {
  28         struct statement *dup = alloc_statement(stmt->pos, stmt->type);
  29         *dup = *stmt;
  30         return dup;
  31 }
  32
  33 static struct symbol *copy_symbol(struct position pos, struct symbol *sym)
  34 {
  35         if (!sym)
  36                 return sym;
  37         if (sym->ctype.modifiers & (MOD_STATIC | MOD_EXTERN | MOD_TOPLEVEL | MOD_INLINE))
  38                 return sym;
  39         if (!sym->replace) {
  40                 warn(pos, "unreplaced symbol '%s'", show_ident(sym->ident));
  41                 return sym;
  42         }
  43         return sym->replace;
  44 }
  45
  46 static struct symbol_list *copy_symbol_list(struct symbol_list *src)
  47 {
  48         struct symbol_list *dst = NULL;
  49         struct symbol *sym;
  50
  51         FOR_EACH_PTR(src, sym) {
  52                 struct symbol *newsym = copy_symbol(sym->pos, sym);
  53                 add_symbol(&dst, newsym);
  54         } END_FOR_EACH_PTR;
  55         return dst;
  56 }
  57
  58 static struct expression * copy_expression(struct expression *expr)
  59 {
  60         if (!expr)
  61                 return NULL;
  62
  63         switch (expr->type) {
  64         /*
  65          * EXPR_SYMBOL is the interesting case, we may need to replace the
  66          * symbol to the new copy.
  67          */
  68         case EXPR_SYMBOL: {
  69                 struct symbol *sym = copy_symbol(expr->pos, expr->symbol);
  70                 if (sym == expr->symbol)
  71                         break;
  72                 expr = dup_expression(expr);
  73                 expr->symbol = sym;
  74                 break;
  75         }
  76
  77         /* Atomics, never change, just return the expression directly */
  78         case EXPR_VALUE:
  79         case EXPR_STRING:
  80         case EXPR_FVALUE:
  81                 break;
  82
  83         /* Unops: check if the subexpression is unique */
  84         case EXPR_PREOP:
  85         case EXPR_POSTOP: {
  86                 struct expression *unop = copy_expression(expr->unop);
  87                 if (expr->unop == unop)
  88                         break;
  89                 expr = dup_expression(expr);
  90                 expr->unop = unop;
  91                 break;
  92         }
  93
  94         case EXPR_SLICE: {
  95                 struct expression *base = copy_expression(expr->base);
  96                 expr = dup_expression(expr);
  97                 expr->base = base;
  98                 break;
  99         }
 100
 101         /* Binops: copy left/right expressions */
 102         case EXPR_BINOP:
 103         case EXPR_COMMA:
 104         case EXPR_COMPARE:
 105         case EXPR_LOGICAL: {
 106                 struct expression *left = copy_expression(expr->left);
 107                 struct expression *right = copy_expression(expr->right);
 108                 if (left == expr->left && right == expr->right)
 109                         break;
 110                 expr = dup_expression(expr);
 111                 expr->left = left;
 112                 expr->right = right;
 113                 break;
 114         }
 115
 116         case EXPR_ASSIGNMENT: {
 117                 struct expression *left = copy_expression(expr->left);
 118                 struct expression *right = copy_expression(expr->right);
 119                 if (expr->op == '=' && left == expr->left && right == expr->right)
 120                         break;
 121                 expr = dup_expression(expr);
 122                 expr->left = left;
 123                 expr->right = right;
 124                 break;
 125         }
 126
 127         /* Dereference */
 128         case EXPR_DEREF: {
 129                 struct expression *deref = copy_expression(expr->deref);
 130                 expr = dup_expression(expr);
 131                 expr->deref = deref;
 132                 break;
 133         }
 134
 135         /* Cast/sizeof/__alignof__ */
 136         case EXPR_CAST:
 137         case EXPR_SIZEOF:
 138         case EXPR_ALIGNOF: {
 139                 struct expression *cast = copy_expression(expr->cast_expression);
 140                 if (cast == expr->cast_expression)
 141                         break;
 142                 expr = dup_expression(expr);
 143                 expr->cast_expression = cast;
 144                 break;
 145         }
 146
 147         /* Conditional expression */
 148         case EXPR_SELECT:
 149         case EXPR_CONDITIONAL: {
 150                 struct expression *cond = copy_expression(expr->conditional);
 151                 struct expression *true = copy_expression(expr->cond_true);
 152                 struct expression *false = copy_expression(expr->cond_false);
 153                 if (cond == expr->conditional && true == expr->cond_true && false == expr->cond_false)
 154                         break;
 155                 expr = dup_expression(expr);
 156                 expr->conditional = cond;
 157                 expr->cond_true = true;
 158                 expr->cond_false = false;
 159                 break;
 160         }
 161
 162         /* Statement expression */
 163         case EXPR_STATEMENT: {
 164                 struct statement *stmt = alloc_statement(expr->pos, STMT_COMPOUND);
 165                 copy_statement(expr->statement, stmt);
 166                 expr = dup_expression(expr);
 167                 expr->statement = stmt;
 168                 break;
 169         }
 170
 171         /* Call expression */
 172         case EXPR_CALL: {
 173                 struct expression *fn = copy_expression(expr->fn);
 174                 struct expression_list *list = expr->args;
 175                 struct expression *arg;
 176
 177                 expr = dup_expression(expr);
 178                 expr->fn = fn;
 179                 expr->args = NULL;
 180                 FOR_EACH_PTR(list, arg) {
 181                         add_expression(&expr->args, copy_expression(arg));
 182                 } END_FOR_EACH_PTR;
 183                 break;
 184         }
 185
 186         /* Initializer list statement */
 187         case EXPR_INITIALIZER: {
 188                 struct expression_list *list = expr->expr_list;
 189                 struct expression *entry;
 190                 expr = dup_expression(expr);
 191                 expr->expr_list = NULL;
 192                 FOR_EACH_PTR(list, entry) {
 193                         add_expression(&expr->expr_list, copy_expression(entry));
 194                 } END_FOR_EACH_PTR;
 195                 break;
 196         }
 197
 198         /* Label in inline function - hmm. */
 199         case EXPR_LABEL: {
 200                 struct symbol *label_symbol = copy_symbol(expr->pos, expr->label_symbol);
 201                 expr = dup_expression(expr);
 202                 expr->label_symbol = label_symbol;
 203                 break;
 204         }
 205
 206         /* Identifier in member dereference is unchanged across a fn copy */
 207         /* As is an array index expression */
 208         case EXPR_INDEX:
 209         case EXPR_IDENTIFIER:
 210                 break;
 211
 212         /* Position in initializer.. */
 213         case EXPR_POS: {
 214                 struct expression *val = copy_expression(expr->init_expr);
 215                 if (val == expr->init_expr)
 216                         break;
 217                 expr = dup_expression(expr);
 218                 expr->init_expr = val;
 219                 break;
 220         }
 221
 222         default:
 223                 warn(expr->pos, "trying to copy expression type %d", expr->type);
 224         }
 225         return expr;
 226 }
 227
 228 void set_replace(struct symbol *old, struct symbol *new)
 229 {
 230         new->replace = old;
 231         old->replace = new;
 232 }
 233
 234 void unset_replace(struct symbol *sym)
 235 {
 236         struct symbol *r = sym->replace;
 237         if (!r) {
 238                 warn(sym->pos, "symbol '%s' not replaced?", show_ident(sym->ident));
 239                 return;
 240         }
 241         r->replace = NULL;
 242         sym->replace = NULL;
 243 }
 244
 245 static void unset_replace_list(struct symbol_list *list)
 246 {
 247         struct symbol *sym;
 248         FOR_EACH_PTR(list, sym) {
 249                 unset_replace(sym);
 250         } END_FOR_EACH_PTR;
 251 }
 252
 253 static struct statement *copy_one_statement(struct statement *stmt)
 254 {
 255         if (!stmt)
 256                 return NULL;
 257         switch(stmt->type) {
 258         case STMT_NONE:
 259                 break;
 260         case STMT_EXPRESSION: {
 261                 struct expression *expr = copy_expression(stmt->expression);
 262                 if (expr == stmt->expression)
 263                         break;
 264                 stmt = dup_statement(stmt);
 265                 stmt->expression = expr;
 266                 break;
 267         }
 268         case STMT_COMPOUND: {
 269                 struct statement *new = alloc_statement(stmt->pos, STMT_COMPOUND);
 270                 copy_statement(stmt, new);
 271                 stmt = new;
 272                 break;
 273         }
 274         case STMT_IF: {
 275                 struct expression *cond = stmt->if_conditional;
 276                 struct statement *true = stmt->if_true;
 277                 struct statement *false = stmt->if_false;
 278
 279                 cond = copy_expression(cond);
 280                 true = copy_one_statement(true);
 281                 false = copy_one_statement(false);
 282                 if (stmt->if_conditional == cond &&
 283                     stmt->if_true == true &&
 284                     stmt->if_false == false)
 285                         break;
 286                 stmt = dup_statement(stmt);
 287                 stmt->if_conditional = cond;
 288                 stmt->if_true = true;
 289                 stmt->if_false = false;
 290                 break;
 291         }
 292         case STMT_RETURN: {
 293                 struct expression *retval = copy_expression(stmt->ret_value);
 294                 struct symbol *sym = copy_symbol(stmt->pos, stmt->ret_target);
 295
 296                 stmt = dup_statement(stmt);
 297                 stmt->ret_value = retval;
 298                 stmt->ret_target = sym;
 299                 break;
 300         }
 301         case STMT_CASE: {
 302                 stmt = dup_statement(stmt);
 303                 stmt->case_label = copy_symbol(stmt->pos, stmt->case_label);
 304                 stmt->case_expression = copy_expression(stmt->case_expression);
 305                 stmt->case_to = copy_expression(stmt->case_to);
 306                 stmt->case_statement = copy_one_statement(stmt->case_statement);
 307                 break;
 308         }
 309         case STMT_SWITCH: {
 310                 struct symbol *switch_break = copy_symbol(stmt->pos, stmt->switch_break);
 311                 struct symbol *switch_case = copy_symbol(stmt->pos, stmt->switch_case);
 312                 struct expression *expr = copy_expression(stmt->switch_expression);
 313                 struct statement *switch_stmt = copy_one_statement(stmt->switch_statement);
 314                 stmt = dup_statement(stmt);
 315                 stmt->switch_break = switch_break;
 316                 stmt->switch_case = switch_case;
 317                 stmt->switch_expression = expr;
 318                 stmt->switch_statement = switch_stmt;
 319                 break;
 320         }
 321         case STMT_ITERATOR: {
 322                 stmt = dup_statement(stmt);
 323                 stmt->iterator_break = copy_symbol(stmt->pos, stmt->iterator_break);
 324                 stmt->iterator_continue = copy_symbol(stmt->pos, stmt->iterator_continue);
 325                 stmt->iterator_syms = copy_symbol_list(stmt->iterator_syms);
 326
 327                 stmt->iterator_pre_statement = copy_one_statement(stmt->iterator_pre_statement);
 328                 stmt->iterator_pre_condition = copy_expression(stmt->iterator_pre_condition);
 329
 330                 stmt->iterator_statement = copy_one_statement(stmt->iterator_statement);
 331
 332                 stmt->iterator_post_statement = copy_one_statement(stmt->iterator_post_statement);
 333                 stmt->iterator_post_condition = copy_expression(stmt->iterator_post_condition);
 334                 break;
 335         }
 336         case STMT_LABEL: {
 337                 stmt = dup_statement(stmt);
 338                 stmt->label_identifier = copy_symbol(stmt->pos, stmt->label_identifier);
 339                 stmt->label_statement = copy_one_statement(stmt->label_statement);
 340                 break;
 341         }
 342         case STMT_GOTO: {
 343                 stmt = dup_statement(stmt);
 344                 stmt->goto_label = copy_symbol(stmt->pos, stmt->goto_label);
 345                 stmt->goto_expression = copy_expression(stmt->goto_expression);
 346                 stmt->target_list = copy_symbol_list(stmt->target_list);
 347                 break;
 348         }
 349         case STMT_ASM: {
 350                 /* FIXME! */
 351                 break;
 352         }
 353         default:
 354                 warn(stmt->pos, "trying to copy statement type %d", stmt->type);
 355                 break;
 356         }
 357         return stmt;
 358 }
 359
 360 /*
 361  * Copy a stateemnt tree from 'src' to 'dst', where both
 362  * source and destination are of type STMT_COMPOUND.
 363  *
 364  * We do this for the tree-level inliner.
 365  *
 366  * This doesn't do the symbol replacement right: it's not
 367  * re-entrant.
 368  */
 369 void copy_statement(struct statement *src, struct statement *dst)
 370 {
 371         struct statement *stmt;
 372         struct symbol *sym;
 373
 374         FOR_EACH_PTR(src->syms, sym) {
 375                 struct symbol *newsym = copy_symbol(src->pos, sym);
 376                 newsym->initializer = copy_expression(sym->initializer);
 377                 add_symbol(&dst->syms, newsym);
 378         } END_FOR_EACH_PTR;
 379
 380         FOR_EACH_PTR(src->stmts, stmt) {
 381                 add_statement(&dst->stmts, copy_one_statement(stmt));
 382         } END_FOR_EACH_PTR;
 383
 384         dst->ret = copy_symbol(src->pos, src->ret);
 385 }
 386
 387 static struct symbol *create_copy_symbol(struct symbol *orig)
 388 {
 389         struct symbol *sym = orig;
 390         if (orig) {
 391                 sym = alloc_symbol(orig->pos, orig->type);
 392                 *sym = *orig;
 393                 set_replace(orig, sym);
 394                 orig = sym;
 395         }
 396         return orig;
 397 }
 398
 399 static struct symbol_list *create_symbol_list(struct symbol_list *src)
 400 {
 401         struct symbol_list *dst = NULL;
 402         struct symbol *sym;
 403
 404         FOR_EACH_PTR(src, sym) {
 405                 struct symbol *newsym = create_copy_symbol(sym);
 406                 add_symbol(&dst, newsym);
 407         } END_FOR_EACH_PTR;
 408         return dst;
 409 }
 410
 411 int inline_function(struct expression *expr, struct symbol *sym)
 412 {
 413         struct symbol_list * fn_symbol_list;
 414         struct symbol *fn = sym->ctype.base_type;
 415         struct expression_list *arg_list = expr->args;
 416         struct statement *stmt = alloc_statement(expr->pos, STMT_COMPOUND);
 417         struct symbol_list *name_list;
 418         struct symbol *name;
 419         struct expression *arg;
 420
 421         if (!fn->inline_stmt) {
 422                 warn(fn->pos, "marked inline, but without a definition");
 423                 return 0;
 424         }
 425         if (fn->expanding)
 426                 return 0;
 427         fn->expanding = 1;
 428
 429         name_list = fn->arguments;
 430
 431         expr->type = EXPR_STATEMENT;
 432         expr->statement = stmt;
 433         expr->ctype = fn->ctype.base_type;
 434
 435         fn_symbol_list = create_symbol_list(sym->inline_symbol_list);
 436
 437         PREPARE_PTR_LIST(name_list, name);
 438         FOR_EACH_PTR(arg_list, arg) {
 439                 struct symbol *a = alloc_symbol(arg->pos, SYM_NODE);
 440
 441                 a->ctype.base_type = arg->ctype;
 442                 if (name) {
 443                         *a = *name;
 444                         set_replace(name, a);
 445                         add_symbol(&fn_symbol_list, a);
 446                 }
 447                 a->initializer = arg;
 448                 add_symbol(&stmt->syms, a);
 449
 450                 NEXT_PTR_LIST(name);
 451         } END_FOR_EACH_PTR;
 452         FINISH_PTR_LIST(name);
 453
 454         copy_statement(fn->inline_stmt, stmt);
 455
 456         unset_replace_list(fn_symbol_list);
 457
 458         evaluate_statement(stmt);
 459
 460         fn->expanding = 0;
 461         return 1;
 462 }
 463
 464 void uninline(struct symbol *sym)
 465 {
 466         struct symbol *fn = sym->ctype.base_type;
 467         struct symbol_list *arg_list = fn->arguments;
 468         struct symbol *p;
 469
 470         sym->symbol_list = create_symbol_list(sym->inline_symbol_list);
 471         FOR_EACH_PTR(arg_list, p) {
 472                 p->replace = p;
 473         } END_FOR_EACH_PTR;
 474         fn->stmt = alloc_statement(fn->pos, STMT_COMPOUND);
 475         copy_statement(fn->inline_stmt, fn->stmt);
 476         unset_replace_list(sym->symbol_list);
 477         unset_replace_list(arg_list);
 478 }