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         /* Binops: copy left/right expressions */
  95         case EXPR_BINOP:
  96         case EXPR_COMMA:
  97         case EXPR_COMPARE:
  98         case EXPR_LOGICAL:
  99         case EXPR_ASSIGNMENT: {
 100                 struct expression *left = copy_expression(expr->left);
 101                 struct expression *right = copy_expression(expr->right);
 102                 if (left == expr->left && right == expr->right)
 103                         break;
 104                 expr = dup_expression(expr);
 105                 expr->left = left;
 106                 expr->right = right;
 107                 break;
 108         }
 109
 110         /* Dereference */
 111         case EXPR_DEREF: {
 112                 struct expression *deref = copy_expression(expr->deref);
 113                 if (deref == expr->deref)
 114                         break;
 115                 expr = dup_expression(expr);
 116                 expr->deref = deref;
 117                 break;
 118         }
 119
 120         /* Cast/sizeof/__alignof__ */
 121         case EXPR_CAST:
 122         case EXPR_SIZEOF:
 123         case EXPR_ALIGNOF: {
 124                 struct expression *cast = copy_expression(expr->cast_expression);
 125                 if (cast == expr->cast_expression)
 126                         break;
 127                 expr = dup_expression(expr);
 128                 expr->cast_expression = cast;
 129                 break;
 130         }
 131
 132         /* Conditional expression */
 133         case EXPR_CONDITIONAL: {
 134                 struct expression *cond = copy_expression(expr->conditional);
 135                 struct expression *true = copy_expression(expr->cond_true);
 136                 struct expression *false = copy_expression(expr->cond_false);
 137                 if (cond == expr->conditional && true == expr->cond_true && false == expr->cond_false)
 138                         break;
 139                 expr = dup_expression(expr);
 140                 expr->conditional = cond;
 141                 expr->cond_true = true;
 142                 expr->cond_false = false;
 143                 break;
 144         }
 145
 146         /* Statement expression */
 147         case EXPR_STATEMENT: {
 148                 struct statement *stmt = alloc_statement(expr->pos, STMT_COMPOUND);
 149                 copy_statement(expr->statement, stmt);
 150                 expr = dup_expression(expr);
 151                 expr->statement = stmt;
 152                 break;
 153         }
 154
 155         /* Call expression */
 156         case EXPR_CALL: {
 157                 struct expression *fn = copy_expression(expr->fn);
 158                 struct expression_list *list = expr->args;
 159                 struct expression *arg;
 160
 161                 expr = dup_expression(expr);
 162                 expr->fn = fn;
 163                 expr->args = NULL;
 164                 FOR_EACH_PTR(list, arg) {
 165                         add_expression(&expr->args, copy_expression(arg));
 166                 } END_FOR_EACH_PTR;
 167                 break;
 168         }
 169
 170         /* Initializer list statement */
 171         case EXPR_INITIALIZER: {
 172                 struct expression_list *list = expr->expr_list;
 173                 struct expression *entry;
 174                 expr = dup_expression(expr);
 175                 expr->expr_list = NULL;
 176                 FOR_EACH_PTR(list, entry) {
 177                         add_expression(&expr->expr_list, copy_expression(entry));
 178                 } END_FOR_EACH_PTR;
 179                 break;
 180         }
 181
 182         /* Label in inline function - hmm. */
 183         case EXPR_LABEL: {
 184                 struct symbol *label_symbol = copy_symbol(expr->pos, expr->label_symbol);
 185                 expr = dup_expression(expr);
 186                 expr->label_symbol = label_symbol;
 187                 break;
 188         }
 189
 190         /* Identifier in member dereference is unchanged across a fn copy */
 191         /* As is an array index expression */
 192         case EXPR_INDEX:
 193         case EXPR_IDENTIFIER:
 194                 break;
 195
 196         /* Position in initializer.. */
 197         case EXPR_POS: {
 198                 struct expression *val = copy_expression(expr->init_expr);
 199                 if (val == expr->init_expr)
 200                         break;
 201                 expr = dup_expression(expr);
 202                 expr->init_expr = val;
 203                 break;
 204         }
 205
 206         default:
 207                 warn(expr->pos, "trying to copy expression type %d", expr->type);
 208         }
 209         return expr;
 210 }
 211
 212 void set_replace(struct symbol *old, struct symbol *new)
 213 {
 214         new->replace = old;
 215         old->replace = new;
 216 }
 217
 218 void unset_replace(struct symbol *sym)
 219 {
 220         struct symbol *r = sym->replace;
 221         if (!r) {
 222                 warn(sym->pos, "symbol '%s' not replaced?", show_ident(sym->ident));
 223                 return;
 224         }
 225         r->replace = NULL;
 226         sym->replace = NULL;
 227 }
 228
 229 static void unset_replace_list(struct symbol_list *list)
 230 {
 231         struct symbol *sym;
 232         FOR_EACH_PTR(list, sym) {
 233                 unset_replace(sym);
 234         } END_FOR_EACH_PTR;
 235 }
 236
 237 static struct statement *copy_one_statement(struct statement *stmt)
 238 {
 239         if (!stmt)
 240                 return NULL;
 241         switch(stmt->type) {
 242         case STMT_NONE:
 243                 break;
 244         case STMT_EXPRESSION: {
 245                 struct expression *expr = copy_expression(stmt->expression);
 246                 if (expr == stmt->expression)
 247                         break;
 248                 stmt = dup_statement(stmt);
 249                 stmt->expression = expr;
 250                 break;
 251         }
 252         case STMT_COMPOUND: {
 253                 struct statement *new = alloc_statement(stmt->pos, STMT_COMPOUND);
 254                 copy_statement(stmt, new);
 255                 stmt = new;
 256                 break;
 257         }
 258         case STMT_IF: {
 259                 struct expression *cond = stmt->if_conditional;
 260                 struct statement *true = stmt->if_true;
 261                 struct statement *false = stmt->if_false;
 262
 263                 cond = copy_expression(cond);
 264                 true = copy_one_statement(true);
 265                 false = copy_one_statement(false);
 266                 if (stmt->if_conditional == cond &&
 267                     stmt->if_true == true &&
 268                     stmt->if_false == false)
 269                         break;
 270                 stmt = dup_statement(stmt);
 271                 stmt->if_conditional = cond;
 272                 stmt->if_true = true;
 273                 stmt->if_false = false;
 274                 break;
 275         }
 276         case STMT_RETURN: {
 277                 struct expression *retval = copy_expression(stmt->ret_value);
 278                 struct symbol *sym = copy_symbol(stmt->pos, stmt->ret_target);
 279
 280                 stmt = dup_statement(stmt);
 281                 stmt->ret_value = retval;
 282                 stmt->ret_target = sym;
 283                 break;
 284         }
 285         case STMT_CASE: {
 286                 stmt = dup_statement(stmt);
 287                 stmt->case_label = copy_symbol(stmt->pos, stmt->case_label);
 288                 stmt->case_expression = copy_expression(stmt->case_expression);
 289                 stmt->case_to = copy_expression(stmt->case_to);
 290                 stmt->case_statement = copy_one_statement(stmt->case_statement);
 291                 break;
 292         }
 293         case STMT_SWITCH: {
 294                 struct symbol *switch_break = copy_symbol(stmt->pos, stmt->switch_break);
 295                 struct symbol *switch_case = copy_symbol(stmt->pos, stmt->switch_case);
 296                 struct expression *expr = copy_expression(stmt->switch_expression);
 297                 struct statement *switch_stmt = copy_one_statement(stmt->switch_statement);
 298                 stmt = dup_statement(stmt);
 299                 stmt->switch_break = switch_break;
 300                 stmt->switch_case = switch_case;
 301                 stmt->switch_expression = expr;
 302                 stmt->switch_statement = switch_stmt;
 303                 break;
 304         }
 305         case STMT_ITERATOR: {
 306                 stmt = dup_statement(stmt);
 307                 stmt->iterator_break = copy_symbol(stmt->pos, stmt->iterator_break);
 308                 stmt->iterator_continue = copy_symbol(stmt->pos, stmt->iterator_continue);
 309                 stmt->iterator_syms = copy_symbol_list(stmt->iterator_syms);
 310
 311                 stmt->iterator_pre_statement = copy_one_statement(stmt->iterator_pre_statement);
 312                 stmt->iterator_pre_condition = copy_expression(stmt->iterator_pre_condition);
 313
 314                 stmt->iterator_statement = copy_one_statement(stmt->iterator_statement);
 315
 316                 stmt->iterator_post_statement = copy_one_statement(stmt->iterator_post_statement);
 317                 stmt->iterator_post_condition = copy_expression(stmt->iterator_post_condition);
 318                 break;
 319         }
 320         case STMT_LABEL: {
 321                 stmt = dup_statement(stmt);
 322                 stmt->label_identifier = copy_symbol(stmt->pos, stmt->label_identifier);
 323                 stmt->label_statement = copy_one_statement(stmt->label_statement);
 324                 break;
 325         }
 326         case STMT_GOTO: {
 327                 stmt = dup_statement(stmt);
 328                 stmt->goto_label = copy_symbol(stmt->pos, stmt->goto_label);
 329                 stmt->goto_expression = copy_expression(stmt->goto_expression);
 330                 break;
 331         }
 332         case STMT_ASM: {
 333                 /* FIXME! */
 334                 break;
 335         }
 336         default:
 337                 warn(stmt->pos, "trying to copy statement type %d", stmt->type);
 338                 break;
 339         }
 340         return stmt;
 341 }
 342
 343 /*
 344  * Copy a stateemnt tree from 'src' to 'dst', where both
 345  * source and destination are of type STMT_COMPOUND.
 346  *
 347  * We do this for the tree-level inliner.
 348  *
 349  * This doesn't do the symbol replacement right: it's not
 350  * re-entrant.
 351  */
 352 void copy_statement(struct statement *src, struct statement *dst)
 353 {
 354         struct statement *stmt;
 355         struct symbol *sym;
 356
 357         FOR_EACH_PTR(src->syms, sym) {
 358                 struct symbol *newsym = copy_symbol(src->pos, sym);
 359                 newsym->initializer = copy_expression(sym->initializer);
 360                 add_symbol(&dst->syms, newsym);
 361         } END_FOR_EACH_PTR;
 362
 363         FOR_EACH_PTR(src->stmts, stmt) {
 364                 add_statement(&dst->stmts, copy_one_statement(stmt));
 365         } END_FOR_EACH_PTR;
 366
 367         dst->ret = copy_symbol(src->pos, src->ret);
 368 }
 369
 370 static struct symbol *create_copy_symbol(struct symbol *orig)
 371 {
 372         struct symbol *sym = orig;
 373         if (orig) {
 374                 sym = alloc_symbol(orig->pos, orig->type);
 375                 sym->ident = orig->ident;
 376                 sym->ctype = orig->ctype;
 377                 sym->initializer = NULL;
 378                 set_replace(orig, sym);
 379         }
 380         return orig;
 381 }
 382
 383 static struct symbol_list *create_symbol_list(struct symbol_list *src)
 384 {
 385         struct symbol_list *dst = NULL;
 386         struct symbol *sym;
 387
 388         FOR_EACH_PTR(src, sym) {
 389                 struct symbol *newsym = create_copy_symbol(sym);
 390                 add_symbol(&dst, newsym);
 391         } END_FOR_EACH_PTR;
 392         return dst;
 393 }
 394
 395 int inline_function(struct expression *expr, struct symbol *sym)
 396 {
 397         struct symbol_list * fn_symbol_list;
 398         struct symbol *fn = sym->ctype.base_type;
 399         struct expression_list *arg_list = expr->args;
 400         struct statement *stmt = alloc_statement(expr->pos, STMT_COMPOUND);
 401         struct symbol_list *name_list;
 402         struct symbol *name;
 403         struct expression *arg;
 404
 405         if (!fn->stmt) {
 406                 warn(fn->pos, "marked inline, but without a definition");
 407                 return 0;
 408         }
 409         name_list = fn->arguments;
 410
 411         stmt = alloc_statement(expr->pos, STMT_COMPOUND);
 412
 413         expr->type = EXPR_STATEMENT;
 414         expr->statement = stmt;
 415         expr->ctype = fn->ctype.base_type;
 416
 417         fn_symbol_list = create_symbol_list(sym->symbol_list);
 418
 419         PREPARE_PTR_LIST(name_list, name);
 420         FOR_EACH_PTR(arg_list, arg) {
 421                 struct symbol *a = alloc_symbol(arg->pos, SYM_NODE);
 422
 423                 a->ctype.base_type = arg->ctype;
 424                 if (name) {
 425                         a->ident = name->ident;
 426                         a->ctype = name->ctype;
 427                         set_replace(name, a);
 428                         add_symbol(&fn_symbol_list, a);
 429                 }
 430                 a->initializer = arg;
 431                 add_symbol(&stmt->syms, a);
 432
 433                 NEXT_PTR_LIST(name);
 434         } END_FOR_EACH_PTR;
 435         FINISH_PTR_LIST(name);
 436
 437         copy_statement(fn->stmt, stmt);
 438
 439         unset_replace_list(fn_symbol_list);
 440
 441         evaluate_statement(stmt);
 442
 443         return 1;
 444 }