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_SELECT:
 134         case EXPR_CONDITIONAL: {
 135                 struct expression *cond = copy_expression(expr->conditional);
 136                 struct expression *true = copy_expression(expr->cond_true);
 137                 struct expression *false = copy_expression(expr->cond_false);
 138                 if (cond == expr->conditional && true == expr->cond_true && false == expr->cond_false)
 139                         break;
 140                 expr = dup_expression(expr);
 141                 expr->conditional = cond;
 142                 expr->cond_true = true;
 143                 expr->cond_false = false;
 144                 break;
 145         }
 146
 147         /* Statement expression */
 148         case EXPR_STATEMENT: {
 149                 struct statement *stmt = alloc_statement(expr->pos, STMT_COMPOUND);
 150                 copy_statement(expr->statement, stmt);
 151                 expr = dup_expression(expr);
 152                 expr->statement = stmt;
 153                 break;
 154         }
 155
 156         /* Call expression */
 157         case EXPR_CALL: {
 158                 struct expression *fn = copy_expression(expr->fn);
 159                 struct expression_list *list = expr->args;
 160                 struct expression *arg;
 161
 162                 expr = dup_expression(expr);
 163                 expr->fn = fn;
 164                 expr->args = NULL;
 165                 FOR_EACH_PTR(list, arg) {
 166                         add_expression(&expr->args, copy_expression(arg));
 167                 } END_FOR_EACH_PTR;
 168                 break;
 169         }
 170
 171         /* Initializer list statement */
 172         case EXPR_INITIALIZER: {
 173                 struct expression_list *list = expr->expr_list;
 174                 struct expression *entry;
 175                 expr = dup_expression(expr);
 176                 expr->expr_list = NULL;
 177                 FOR_EACH_PTR(list, entry) {
 178                         add_expression(&expr->expr_list, copy_expression(entry));
 179                 } END_FOR_EACH_PTR;
 180                 break;
 181         }
 182
 183         /* Label in inline function - hmm. */
 184         case EXPR_LABEL: {
 185                 struct symbol *label_symbol = copy_symbol(expr->pos, expr->label_symbol);
 186                 expr = dup_expression(expr);
 187                 expr->label_symbol = label_symbol;
 188                 break;
 189         }
 190
 191         /* Identifier in member dereference is unchanged across a fn copy */
 192         /* As is an array index expression */
 193         case EXPR_INDEX:
 194         case EXPR_IDENTIFIER:
 195                 break;
 196
 197         /* Position in initializer.. */
 198         case EXPR_POS: {
 199                 struct expression *val = copy_expression(expr->init_expr);
 200                 if (val == expr->init_expr)
 201                         break;
 202                 expr = dup_expression(expr);
 203                 expr->init_expr = val;
 204                 break;
 205         }
 206
 207         default:
 208                 warn(expr->pos, "trying to copy expression type %d", expr->type);
 209         }
 210         return expr;
 211 }
 212
 213 void set_replace(struct symbol *old, struct symbol *new)
 214 {
 215         new->replace = old;
 216         old->replace = new;
 217 }
 218
 219 void unset_replace(struct symbol *sym)
 220 {
 221         struct symbol *r = sym->replace;
 222         if (!r) {
 223                 warn(sym->pos, "symbol '%s' not replaced?", show_ident(sym->ident));
 224                 return;
 225         }
 226         r->replace = NULL;
 227         sym->replace = NULL;
 228 }
 229
 230 static void unset_replace_list(struct symbol_list *list)
 231 {
 232         struct symbol *sym;
 233         FOR_EACH_PTR(list, sym) {
 234                 unset_replace(sym);
 235         } END_FOR_EACH_PTR;
 236 }
 237
 238 static struct statement *copy_one_statement(struct statement *stmt)
 239 {
 240         if (!stmt)
 241                 return NULL;
 242         switch(stmt->type) {
 243         case STMT_NONE:
 244                 break;
 245         case STMT_EXPRESSION: {
 246                 struct expression *expr = copy_expression(stmt->expression);
 247                 if (expr == stmt->expression)
 248                         break;
 249                 stmt = dup_statement(stmt);
 250                 stmt->expression = expr;
 251                 break;
 252         }
 253         case STMT_COMPOUND: {
 254                 struct statement *new = alloc_statement(stmt->pos, STMT_COMPOUND);
 255                 copy_statement(stmt, new);
 256                 stmt = new;
 257                 break;
 258         }
 259         case STMT_IF: {
 260                 struct expression *cond = stmt->if_conditional;
 261                 struct statement *true = stmt->if_true;
 262                 struct statement *false = stmt->if_false;
 263
 264                 cond = copy_expression(cond);
 265                 true = copy_one_statement(true);
 266                 false = copy_one_statement(false);
 267                 if (stmt->if_conditional == cond &&
 268                     stmt->if_true == true &&
 269                     stmt->if_false == false)
 270                         break;
 271                 stmt = dup_statement(stmt);
 272                 stmt->if_conditional = cond;
 273                 stmt->if_true = true;
 274                 stmt->if_false = false;
 275                 break;
 276         }
 277         case STMT_RETURN: {
 278                 struct expression *retval = copy_expression(stmt->ret_value);
 279                 struct symbol *sym = copy_symbol(stmt->pos, stmt->ret_target);
 280
 281                 stmt = dup_statement(stmt);
 282                 stmt->ret_value = retval;
 283                 stmt->ret_target = sym;
 284                 break;
 285         }
 286         case STMT_CASE: {
 287                 stmt = dup_statement(stmt);
 288                 stmt->case_label = copy_symbol(stmt->pos, stmt->case_label);
 289                 stmt->case_expression = copy_expression(stmt->case_expression);
 290                 stmt->case_to = copy_expression(stmt->case_to);
 291                 stmt->case_statement = copy_one_statement(stmt->case_statement);
 292                 break;
 293         }
 294         case STMT_SWITCH: {
 295                 struct symbol *switch_break = copy_symbol(stmt->pos, stmt->switch_break);
 296                 struct symbol *switch_case = copy_symbol(stmt->pos, stmt->switch_case);
 297                 struct expression *expr = copy_expression(stmt->switch_expression);
 298                 struct statement *switch_stmt = copy_one_statement(stmt->switch_statement);
 299                 stmt = dup_statement(stmt);
 300                 stmt->switch_break = switch_break;
 301                 stmt->switch_case = switch_case;
 302                 stmt->switch_expression = expr;
 303                 stmt->switch_statement = switch_stmt;
 304                 break;
 305         }
 306         case STMT_ITERATOR: {
 307                 stmt = dup_statement(stmt);
 308                 stmt->iterator_break = copy_symbol(stmt->pos, stmt->iterator_break);
 309                 stmt->iterator_continue = copy_symbol(stmt->pos, stmt->iterator_continue);
 310                 stmt->iterator_syms = copy_symbol_list(stmt->iterator_syms);
 311
 312                 stmt->iterator_pre_statement = copy_one_statement(stmt->iterator_pre_statement);
 313                 stmt->iterator_pre_condition = copy_expression(stmt->iterator_pre_condition);
 314
 315                 stmt->iterator_statement = copy_one_statement(stmt->iterator_statement);
 316
 317                 stmt->iterator_post_statement = copy_one_statement(stmt->iterator_post_statement);
 318                 stmt->iterator_post_condition = copy_expression(stmt->iterator_post_condition);
 319                 break;
 320         }
 321         case STMT_LABEL: {
 322                 stmt = dup_statement(stmt);
 323                 stmt->label_identifier = copy_symbol(stmt->pos, stmt->label_identifier);
 324                 stmt->label_statement = copy_one_statement(stmt->label_statement);
 325                 break;
 326         }
 327         case STMT_GOTO: {
 328                 stmt = dup_statement(stmt);
 329                 stmt->goto_label = copy_symbol(stmt->pos, stmt->goto_label);
 330                 stmt->goto_expression = copy_expression(stmt->goto_expression);
 331                 stmt->target_list = copy_symbol_list(stmt->target_list);
 332                 break;
 333         }
 334         case STMT_ASM: {
 335                 /* FIXME! */
 336                 break;
 337         }
 338         default:
 339                 warn(stmt->pos, "trying to copy statement type %d", stmt->type);
 340                 break;
 341         }
 342         return stmt;
 343 }
 344
 345 /*
 346  * Copy a stateemnt tree from 'src' to 'dst', where both
 347  * source and destination are of type STMT_COMPOUND.
 348  *
 349  * We do this for the tree-level inliner.
 350  *
 351  * This doesn't do the symbol replacement right: it's not
 352  * re-entrant.
 353  */
 354 void copy_statement(struct statement *src, struct statement *dst)
 355 {
 356         struct statement *stmt;
 357         struct symbol *sym;
 358
 359         FOR_EACH_PTR(src->syms, sym) {
 360                 struct symbol *newsym = copy_symbol(src->pos, sym);
 361                 newsym->initializer = copy_expression(sym->initializer);
 362                 add_symbol(&dst->syms, newsym);
 363         } END_FOR_EACH_PTR;
 364
 365         FOR_EACH_PTR(src->stmts, stmt) {
 366                 add_statement(&dst->stmts, copy_one_statement(stmt));
 367         } END_FOR_EACH_PTR;
 368
 369         dst->ret = copy_symbol(src->pos, src->ret);
 370 }
 371
 372 static struct symbol *create_copy_symbol(struct symbol *orig)
 373 {
 374         struct symbol *sym = orig;
 375         if (orig) {
 376                 sym = alloc_symbol(orig->pos, orig->type);
 377                 *sym = *orig;
 378                 set_replace(orig, sym);
 379                 orig = sym;
 380         }
 381         return orig;
 382 }
 383
 384 static struct symbol_list *create_symbol_list(struct symbol_list *src)
 385 {
 386         struct symbol_list *dst = NULL;
 387         struct symbol *sym;
 388
 389         FOR_EACH_PTR(src, sym) {
 390                 struct symbol *newsym = create_copy_symbol(sym);
 391                 add_symbol(&dst, newsym);
 392         } END_FOR_EACH_PTR;
 393         return dst;
 394 }
 395
 396 int inline_function(struct expression *expr, struct symbol *sym)
 397 {
 398         struct symbol_list * fn_symbol_list;
 399         struct symbol *fn = sym->ctype.base_type;
 400         struct expression_list *arg_list = expr->args;
 401         struct statement *stmt = alloc_statement(expr->pos, STMT_COMPOUND);
 402         struct symbol_list *name_list;
 403         struct symbol *name;
 404         struct expression *arg;
 405
 406         if (!fn->stmt) {
 407                 warn(fn->pos, "marked inline, but without a definition");
 408                 return 0;
 409         }
 410         if (fn->expanding)
 411                 return 0;
 412         fn->expanding = 1;
 413
 414         name_list = fn->arguments;
 415
 416         stmt = alloc_statement(expr->pos, STMT_COMPOUND);
 417
 418         expr->type = EXPR_STATEMENT;
 419         expr->statement = stmt;
 420         expr->ctype = fn->ctype.base_type;
 421
 422         fn_symbol_list = create_symbol_list(sym->symbol_list);
 423
 424         PREPARE_PTR_LIST(name_list, name);
 425         FOR_EACH_PTR(arg_list, arg) {
 426                 struct symbol *a = alloc_symbol(arg->pos, SYM_NODE);
 427
 428                 a->ctype.base_type = arg->ctype;
 429                 if (name) {
 430                         *a = *name;
 431                         set_replace(name, a);
 432                         add_symbol(&fn_symbol_list, a);
 433                 }
 434                 a->initializer = arg;
 435                 add_symbol(&stmt->syms, a);
 436
 437                 NEXT_PTR_LIST(name);
 438         } END_FOR_EACH_PTR;
 439         FINISH_PTR_LIST(name);
 440
 441         copy_statement(fn->stmt, stmt);
 442
 443         unset_replace_list(fn_symbol_list);
 444
 445         evaluate_statement(stmt);
 446
 447         fn->expanding = 0;
 448         return 1;
 449 }