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                 break;
  81
  82         /* Unops: check if the subexpression is unique */
  83         case EXPR_PREOP:
  84         case EXPR_POSTOP: {
  85                 struct expression *unop = copy_expression(expr->unop);
  86                 if (expr->unop == unop)
  87                         break;
  88                 expr = dup_expression(expr);
  89                 expr->unop = unop;
  90                 break;
  91         }
  92
  93         /* Binops: copy left/right expressions */
  94         case EXPR_BINOP:
  95         case EXPR_COMMA:
  96         case EXPR_COMPARE:
  97         case EXPR_LOGICAL:
  98         case EXPR_ASSIGNMENT: {
  99                 struct expression *left = copy_expression(expr->left);
 100                 struct expression *right = copy_expression(expr->right);
 101                 if (left == expr->left && right == expr->right)
 102                         break;
 103                 expr = dup_expression(expr);
 104                 expr->left = left;
 105                 expr->right = right;
 106                 break;
 107         }
 108
 109         /* Dereference */
 110         case EXPR_DEREF: {
 111                 struct expression *deref = copy_expression(expr->deref);
 112                 if (deref == expr->deref)
 113                         break;
 114                 expr = dup_expression(expr);
 115                 expr->deref = deref;
 116                 break;
 117         }
 118
 119         /* Cast/sizeof/__alignof__ */
 120         case EXPR_CAST:
 121         case EXPR_SIZEOF:
 122         case EXPR_ALIGNOF: {
 123                 struct expression *cast = copy_expression(expr->cast_expression);
 124                 if (cast == expr->cast_expression)
 125                         break;
 126                 expr = dup_expression(expr);
 127                 expr->cast_expression = cast;
 128                 break;
 129         }
 130
 131         /* Conditional expression */
 132         case EXPR_CONDITIONAL: {
 133                 struct expression *cond = copy_expression(expr->conditional);
 134                 struct expression *true = copy_expression(expr->cond_true);
 135                 struct expression *false = copy_expression(expr->cond_false);
 136                 if (cond == expr->conditional && true == expr->cond_true && false == expr->cond_false)
 137                         break;
 138                 expr = dup_expression(expr);
 139                 expr->conditional = cond;
 140                 expr->cond_true = true;
 141                 expr->cond_false = false;
 142                 break;
 143         }
 144
 145         /* Statement expression */
 146         case EXPR_STATEMENT: {
 147                 struct statement *stmt = alloc_statement(expr->pos, STMT_COMPOUND);
 148                 copy_statement(expr->statement, stmt);
 149                 expr = dup_expression(expr);
 150                 expr->statement = stmt;
 151                 break;
 152         }
 153
 154         /* Call expression */
 155         case EXPR_CALL: {
 156                 struct expression *fn = copy_expression(expr->fn);
 157                 struct expression_list *list = expr->args;
 158                 struct expression *arg;
 159
 160                 expr = dup_expression(expr);
 161                 expr->fn = fn;
 162                 expr->args = NULL;
 163                 FOR_EACH_PTR(list, arg) {
 164                         add_expression(&expr->args, copy_expression(arg));
 165                 } END_FOR_EACH_PTR;
 166                 break;
 167         }
 168
 169         /* Initializer list statement */
 170         case EXPR_INITIALIZER: {
 171                 struct expression_list *list = expr->expr_list;
 172                 struct expression *entry;
 173                 expr = dup_expression(expr);
 174                 expr->expr_list = NULL;
 175                 FOR_EACH_PTR(list, entry) {
 176                         add_expression(&expr->expr_list, copy_expression(entry));
 177                 } END_FOR_EACH_PTR;
 178                 break;
 179         }
 180
 181         /* Label in inline function - hmm. */
 182         case EXPR_LABEL: {
 183                 struct symbol *label_symbol = copy_symbol(expr->pos, expr->label_symbol);
 184                 expr = dup_expression(expr);
 185                 expr->label_symbol = label_symbol;
 186                 break;
 187         }
 188
 189         /* Identifier in member dereference is unchanged across a fn copy */
 190         /* As is an array index expression */
 191         case EXPR_INDEX:
 192         case EXPR_IDENTIFIER:
 193                 break;
 194
 195         /* Position in initializer.. */
 196         case EXPR_POS: {
 197                 struct expression *val = copy_expression(expr->init_expr);
 198                 if (val == expr->init_expr)
 199                         break;
 200                 expr = dup_expression(expr);
 201                 expr->init_expr = val;
 202                 break;
 203         }
 204
 205         default:
 206                 warn(expr->pos, "trying to copy expression type %d", expr->type);
 207         }
 208         return expr;
 209 }
 210
 211 void set_replace(struct symbol *old, struct symbol *new)
 212 {
 213         new->replace = old;
 214         old->replace = new;
 215 }
 216
 217 void unset_replace(struct symbol *sym)
 218 {
 219         struct symbol *r = sym->replace;
 220         if (!r) {
 221                 warn(sym->pos, "symbol '%s' not replaced?", show_ident(sym->ident));
 222                 return;
 223         }
 224         r->replace = NULL;
 225         sym->replace = NULL;
 226 }
 227
 228 static void unset_replace_list(struct symbol_list *list)
 229 {
 230         struct symbol *sym;
 231         FOR_EACH_PTR(list, sym) {
 232                 unset_replace(sym);
 233         } END_FOR_EACH_PTR;
 234 }
 235
 236 static struct statement *copy_one_statement(struct statement *stmt)
 237 {
 238         if (!stmt)
 239                 return NULL;
 240         switch(stmt->type) {
 241         case STMT_NONE:
 242                 break;
 243         case STMT_EXPRESSION: {
 244                 struct expression *expr = copy_expression(stmt->expression);
 245                 if (expr == stmt->expression)
 246                         break;
 247                 stmt = dup_statement(stmt);
 248                 stmt->expression = expr;
 249                 break;
 250         }
 251         case STMT_COMPOUND: {
 252                 struct statement *new = alloc_statement(stmt->pos, STMT_COMPOUND);
 253                 copy_statement(stmt, new);
 254                 stmt = new;
 255                 break;
 256         }
 257         case STMT_IF: {
 258                 struct expression *cond = stmt->if_conditional;
 259                 struct statement *true = stmt->if_true;
 260                 struct statement *false = stmt->if_false;
 261
 262                 cond = copy_expression(cond);
 263                 true = copy_one_statement(true);
 264                 false = copy_one_statement(false);
 265                 if (stmt->if_conditional == cond &&
 266                     stmt->if_true == true &&
 267                     stmt->if_false == false)
 268                         break;
 269                 stmt = dup_statement(stmt);
 270                 stmt->if_conditional = cond;
 271                 stmt->if_true = true;
 272                 stmt->if_false = false;
 273                 break;
 274         }
 275         case STMT_RETURN: {
 276                 struct expression *retval = copy_expression(stmt->ret_value);
 277                 struct symbol *sym = copy_symbol(stmt->pos, stmt->ret_target);
 278
 279                 stmt = dup_statement(stmt);
 280                 stmt->ret_value = retval;
 281                 stmt->ret_target = sym;
 282                 break;
 283         }
 284         case STMT_CASE: {
 285                 stmt = dup_statement(stmt);
 286                 stmt->case_label = copy_symbol(stmt->pos, stmt->case_label);
 287                 stmt->case_expression = copy_expression(stmt->case_expression);
 288                 stmt->case_to = copy_expression(stmt->case_to);
 289                 stmt->case_statement = copy_one_statement(stmt->case_statement);
 290                 break;
 291         }
 292         case STMT_SWITCH: {
 293                 struct symbol *switch_break = copy_symbol(stmt->pos, stmt->switch_break);
 294                 struct symbol *switch_case = copy_symbol(stmt->pos, stmt->switch_case);
 295                 struct expression *expr = copy_expression(stmt->switch_expression);
 296                 struct statement *switch_stmt = copy_one_statement(stmt->switch_statement);
 297                 stmt = dup_statement(stmt);
 298                 stmt->switch_break = switch_break;
 299                 stmt->switch_case = switch_case;
 300                 stmt->switch_expression = expr;
 301                 stmt->switch_statement = switch_stmt;
 302                 break;
 303         }
 304         case STMT_ITERATOR: {
 305                 stmt = dup_statement(stmt);
 306                 stmt->iterator_break = copy_symbol(stmt->pos, stmt->iterator_break);
 307                 stmt->iterator_continue = copy_symbol(stmt->pos, stmt->iterator_continue);
 308                 stmt->iterator_syms = copy_symbol_list(stmt->iterator_syms);
 309
 310                 stmt->iterator_pre_statement = copy_one_statement(stmt->iterator_pre_statement);
 311                 stmt->iterator_pre_condition = copy_expression(stmt->iterator_pre_condition);
 312
 313                 stmt->iterator_statement = copy_one_statement(stmt->iterator_statement);
 314
 315                 stmt->iterator_post_statement = copy_one_statement(stmt->iterator_post_statement);
 316                 stmt->iterator_post_condition = copy_expression(stmt->iterator_post_condition);
 317                 break;
 318         }
 319         case STMT_LABEL: {
 320                 stmt = dup_statement(stmt);
 321                 stmt->label_identifier = copy_symbol(stmt->pos, stmt->label_identifier);
 322                 stmt->label_statement = copy_one_statement(stmt->label_statement);
 323                 break;
 324         }
 325         case STMT_GOTO: {
 326                 stmt = dup_statement(stmt);
 327                 stmt->goto_label = copy_symbol(stmt->pos, stmt->goto_label);
 328                 stmt->goto_expression = copy_expression(stmt->goto_expression);
 329                 break;
 330         }
 331         case STMT_ASM: {
 332                 /* FIXME! */
 333                 break;
 334         }
 335         default:
 336                 warn(stmt->pos, "trying to copy statement type %d", stmt->type);
 337                 break;
 338         }
 339         return stmt;
 340 }
 341
 342 /*
 343  * Copy a stateemnt tree from 'src' to 'dst', where both
 344  * source and destination are of type STMT_COMPOUND.
 345  *
 346  * We do this for the tree-level inliner.
 347  *
 348  * This doesn't do the symbol replacement right: it's not
 349  * re-entrant.
 350  */
 351 void copy_statement(struct statement *src, struct statement *dst)
 352 {
 353         struct statement *stmt;
 354         struct symbol *sym;
 355
 356         FOR_EACH_PTR(src->syms, sym) {
 357                 struct symbol *newsym = copy_symbol(src->pos, sym);
 358                 newsym->initializer = copy_expression(sym->initializer);
 359                 add_symbol(&dst->syms, newsym);
 360         } END_FOR_EACH_PTR;
 361
 362         FOR_EACH_PTR(src->stmts, stmt) {
 363                 add_statement(&dst->stmts, copy_one_statement(stmt));
 364         } END_FOR_EACH_PTR;
 365
 366         dst->ret = copy_symbol(src->pos, src->ret);
 367 }
 368
 369 static struct symbol *create_copy_symbol(struct symbol *orig)
 370 {
 371         struct symbol *sym = orig;
 372         if (orig) {
 373                 sym = alloc_symbol(orig->pos, orig->type);
 374                 sym->ident = orig->ident;
 375                 sym->ctype = orig->ctype;
 376                 sym->initializer = NULL;
 377                 set_replace(orig, sym);
 378         }
 379         return orig;
 380 }
 381
 382 static struct symbol_list *create_symbol_list(struct symbol_list *src)
 383 {
 384         struct symbol_list *dst = NULL;
 385         struct symbol *sym;
 386
 387         FOR_EACH_PTR(src, sym) {
 388                 struct symbol *newsym = create_copy_symbol(sym);
 389                 add_symbol(&dst, newsym);
 390         } END_FOR_EACH_PTR;
 391         return dst;
 392 }
 393
 394 int inline_function(struct expression *expr, struct symbol *sym)
 395 {
 396         struct symbol_list * fn_symbol_list;
 397         struct symbol *fn = sym->ctype.base_type;
 398         struct expression_list *arg_list = expr->args;
 399         struct statement *stmt = alloc_statement(expr->pos, STMT_COMPOUND);
 400         struct symbol_list *name_list;
 401         struct symbol *name;
 402         struct expression *arg;
 403
 404         if (!fn->stmt) {
 405                 warn(fn->pos, "marked inline, but without a definition");
 406                 return 0;
 407         }
 408         name_list = fn->arguments;
 409
 410         stmt = alloc_statement(expr->pos, STMT_COMPOUND);
 411
 412         expr->type = EXPR_STATEMENT;
 413         expr->statement = stmt;
 414         expr->ctype = fn->ctype.base_type;
 415
 416         fn_symbol_list = create_symbol_list(sym->symbol_list);
 417
 418         PREPARE_PTR_LIST(name_list, name);
 419         FOR_EACH_PTR(arg_list, arg) {
 420                 struct symbol *a = alloc_symbol(arg->pos, SYM_NODE);
 421
 422                 a->ctype.base_type = arg->ctype;
 423                 if (name) {
 424                         a->ident = name->ident;
 425                         a->ctype = name->ctype;
 426                         set_replace(name, a);
 427                         add_symbol(&fn_symbol_list, a);
 428                 }
 429                 a->initializer = arg;
 430                 add_symbol(&stmt->syms, a);
 431
 432                 NEXT_PTR_LIST(name);
 433         } END_FOR_EACH_PTR;
 434         FINISH_PTR_LIST(name);
 435
 436         copy_statement(fn->stmt, stmt);
 437
 438         unset_replace_list(fn_symbol_list);
 439
 440         evaluate_statement(stmt);
 441
 442         return 1;
 443 }