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