?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Forbid enum redefinition.
[tinycc.git] / tccgen.c
blob53a2b6b424308d98628c203ea6f3266693e8f398
1 /*
2 * TCC - Tiny C Compiler
3 *
4 * Copyright (c) 2001-2004 Fabrice Bellard
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #include "tcc.h"
22
23 /********************************************************/
24 /* global variables */
25
26 /* loc : local variable index
27 ind : output code index
28 rsym: return symbol
29 anon_sym: anonymous symbol index
30 */
31 ST_DATA int rsym, anon_sym, ind, loc;
32
33 ST_DATA Section *text_section, *data_section, *bss_section; /* predefined sections */
34 ST_DATA Section *cur_text_section; /* current section where function code is generated */
35 #ifdef CONFIG_TCC_ASM
36 ST_DATA Section *last_text_section; /* to handle .previous asm directive */
37 #endif
38 #ifdef CONFIG_TCC_BCHECK
39 /* bound check related sections */
40 ST_DATA Section *bounds_section; /* contains global data bound description */
41 ST_DATA Section *lbounds_section; /* contains local data bound description */
42 #endif
43 /* symbol sections */
44 ST_DATA Section *symtab_section, *strtab_section;
45 /* debug sections */
46 ST_DATA Section *stab_section, *stabstr_section;
47 ST_DATA Sym *sym_free_first;
48 ST_DATA void **sym_pools;
49 ST_DATA int nb_sym_pools;
50
51 ST_DATA Sym *global_stack;
52 ST_DATA Sym *local_stack;
53 ST_DATA Sym *scope_stack_bottom;
54 ST_DATA Sym *define_stack;
55 ST_DATA Sym *global_label_stack;
56 ST_DATA Sym *local_label_stack;
57
58 ST_DATA int vla_sp_loc_tmp; /* vla_sp_loc is set to this when the value won't be needed later */
59 ST_DATA int vla_sp_root_loc; /* vla_sp_loc for SP before any VLAs were pushed */
60 ST_DATA int *vla_sp_loc; /* Pointer to variable holding location to store stack pointer on the stack when modifying stack pointer */
61 ST_DATA int vla_flags; /* VLA_* flags */
62
63 ST_DATA SValue __vstack[1+VSTACK_SIZE], *vtop;
64
65 ST_DATA int const_wanted; /* true if constant wanted */
66 ST_DATA int nocode_wanted; /* true if no code generation wanted for an expression */
67 ST_DATA int global_expr; /* true if compound literals must be allocated globally (used during initializers parsing */
68 ST_DATA CType func_vt; /* current function return type (used by return instruction) */
69 ST_DATA int func_vc;
70 ST_DATA int last_line_num, last_ind, func_ind; /* debug last line number and pc */
71 ST_DATA char *funcname;
72
73 ST_DATA CType char_pointer_type, func_old_type, int_type, size_type;
74
75 /* ------------------------------------------------------------------------- */
76 static void gen_cast(CType *type);
77 static inline CType *pointed_type(CType *type);
78 static int is_compatible_types(CType *type1, CType *type2);
79 static int parse_btype(CType *type, AttributeDef *ad);
80 static void type_decl(CType *type, AttributeDef *ad, int *v, int td);
81 static void parse_expr_type(CType *type);
82 static void decl_initializer(CType *type, Section *sec, unsigned long c, int first, int size_only);
83 static void block(int *bsym, int *csym, int *case_sym, int *def_sym, int case_reg, int is_expr);
84 static void decl_initializer_alloc(CType *type, AttributeDef *ad, int r, int has_init, int v, char *asm_label, int scope);
85 static int decl0(int l, int is_for_loop_init);
86 static void expr_eq(void);
87 static void unary_type(CType *type);
88 static void vla_runtime_type_size(CType *type, int *a);
89 static void vla_sp_save(void);
90 static int is_compatible_parameter_types(CType *type1, CType *type2);
91 static void expr_type(CType *type);
92
93 ST_INLN int is_float(int t)
94 {
95 int bt;
96 bt = t & VT_BTYPE;
97 return bt == VT_LDOUBLE || bt == VT_DOUBLE || bt == VT_FLOAT || bt == VT_QFLOAT;
98 }
99
100 /* we use our own 'finite' function to avoid potential problems with
101 non standard math libs */
102 /* XXX: endianness dependent */
103 ST_FUNC int ieee_finite(double d)
104 {
105 int *p = (int *)&d;
106 return ((unsigned)((p[1] | 0x800fffff) + 1)) >> 31;
107 }
108
109 ST_FUNC void test_lvalue(void)
110 {
111 if (!(vtop->r & VT_LVAL))
112 expect("lvalue");
113 }
114
115 /* ------------------------------------------------------------------------- */
116 /* symbol allocator */
117 static Sym *__sym_malloc(void)
118 {
119 Sym *sym_pool, *sym, *last_sym;
120 int i;
121
122 sym_pool = tcc_malloc(SYM_POOL_NB * sizeof(Sym));
123 dynarray_add(&sym_pools, &nb_sym_pools, sym_pool);
124
125 last_sym = sym_free_first;
126 sym = sym_pool;
127 for(i = 0; i < SYM_POOL_NB; i++) {
128 sym->next = last_sym;
129 last_sym = sym;
130 sym++;
131 }
132 sym_free_first = last_sym;
133 return last_sym;
134 }
135
136 static inline Sym *sym_malloc(void)
137 {
138 Sym *sym;
139 sym = sym_free_first;
140 if (!sym)
141 sym = __sym_malloc();
142 sym_free_first = sym->next;
143 return sym;
144 }
145
146 ST_INLN void sym_free(Sym *sym)
147 {
148 sym->next = sym_free_first;
149 tcc_free(sym->asm_label);
150 sym_free_first = sym;
151 }
152
153 /* push, without hashing */
154 ST_FUNC Sym *sym_push2(Sym **ps, int v, int t, long c)
155 {
156 Sym *s;
157 if (ps == &local_stack) {
158 for (s = *ps; s && s != scope_stack_bottom; s = s->prev)
159 if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM && s->v == v)
160 tcc_error("incompatible types for redefinition of '%s'",
161 get_tok_str(v, NULL));
162 }
163 s = *ps;
164 s = sym_malloc();
165 s->asm_label = NULL;
166 s->v = v;
167 s->type.t = t;
168 s->type.ref = NULL;
169 #ifdef _WIN64
170 s->d = NULL;
171 #endif
172 s->c = c;
173 s->next = NULL;
174 /* add in stack */
175 s->prev = *ps;
176 *ps = s;
177 return s;
178 }
179
180 /* find a symbol and return its associated structure. 's' is the top
181 of the symbol stack */
182 ST_FUNC Sym *sym_find2(Sym *s, int v)
183 {
184 while (s) {
185 if (s->v == v)
186 return s;
187 s = s->prev;
188 }
189 return NULL;
190 }
191
192 /* structure lookup */
193 ST_INLN Sym *struct_find(int v)
194 {
195 v -= TOK_IDENT;
196 if ((unsigned)v >= (unsigned)(tok_ident - TOK_IDENT))
197 return NULL;
198 return table_ident[v]->sym_struct;
199 }
200
201 /* find an identifier */
202 ST_INLN Sym *sym_find(int v)
203 {
204 v -= TOK_IDENT;
205 if ((unsigned)v >= (unsigned)(tok_ident - TOK_IDENT))
206 return NULL;
207 return table_ident[v]->sym_identifier;
208 }
209
210 /* push a given symbol on the symbol stack */
211 ST_FUNC Sym *sym_push(int v, CType *type, int r, int c)
212 {
213 Sym *s, **ps;
214 TokenSym *ts;
215
216 if (local_stack)
217 ps = &local_stack;
218 else
219 ps = &global_stack;
220 s = sym_push2(ps, v, type->t, c);
221 s->type.ref = type->ref;
222 s->r = r;
223 /* don't record fields or anonymous symbols */
224 /* XXX: simplify */
225 if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM) {
226 /* record symbol in token array */
227 ts = table_ident[(v & ~SYM_STRUCT) - TOK_IDENT];
228 if (v & SYM_STRUCT)
229 ps = &ts->sym_struct;
230 else
231 ps = &ts->sym_identifier;
232 s->prev_tok = *ps;
233 *ps = s;
234 }
235 return s;
236 }
237
238 /* push a global identifier */
239 ST_FUNC Sym *global_identifier_push(int v, int t, int c)
240 {
241 Sym *s, **ps;
242 s = sym_push2(&global_stack, v, t, c);
243 /* don't record anonymous symbol */
244 if (v < SYM_FIRST_ANOM) {
245 ps = &table_ident[v - TOK_IDENT]->sym_identifier;
246 /* modify the top most local identifier, so that
247 sym_identifier will point to 's' when popped */
248 while (*ps != NULL)
249 ps = &(*ps)->prev_tok;
250 s->prev_tok = NULL;
251 *ps = s;
252 }
253 return s;
254 }
255
256 /* pop symbols until top reaches 'b' */
257 ST_FUNC void sym_pop(Sym **ptop, Sym *b)
258 {
259 Sym *s, *ss, **ps;
260 TokenSym *ts;
261 int v;
262
263 s = *ptop;
264 while(s != b) {
265 ss = s->prev;
266 v = s->v;
267 /* remove symbol in token array */
268 /* XXX: simplify */
269 if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM) {
270 ts = table_ident[(v & ~SYM_STRUCT) - TOK_IDENT];
271 if (v & SYM_STRUCT)
272 ps = &ts->sym_struct;
273 else
274 ps = &ts->sym_identifier;
275 *ps = s->prev_tok;
276 }
277 sym_free(s);
278 s = ss;
279 }
280 *ptop = b;
281 }
282
283 static void weaken_symbol(Sym *sym)
284 {
285 sym->type.t |= VT_WEAK;
286 if (sym->c > 0) {
287 int esym_type;
288 ElfW(Sym) *esym;
289
290 esym = &((ElfW(Sym) *)symtab_section->data)[sym->c];
291 esym_type = ELFW(ST_TYPE)(esym->st_info);
292 esym->st_info = ELFW(ST_INFO)(STB_WEAK, esym_type);
293 }
294 }
295
296 /* ------------------------------------------------------------------------- */
297
298 ST_FUNC void swap(int *p, int *q)
299 {
300 int t;
301 t = *p;
302 *p = *q;
303 *q = t;
304 }
305
306 static void vsetc(CType *type, int r, CValue *vc)
307 {
308 int v;
309
310 if (vtop >= vstack + (VSTACK_SIZE - 1))
311 tcc_error("memory full");
312 /* cannot let cpu flags if other instruction are generated. Also
313 avoid leaving VT_JMP anywhere except on the top of the stack
314 because it would complicate the code generator. */
315 if (vtop >= vstack) {
316 v = vtop->r & VT_VALMASK;
317 if (v == VT_CMP || (v & ~1) == VT_JMP)
318 gv(RC_INT);
319 }
320 vtop++;
321 vtop->type = *type;
322 vtop->r = r;
323 vtop->r2 = VT_CONST;
324 vtop->c = *vc;
325 }
326
327 /* push constant of type "type" with useless value */
328 void vpush(CType *type)
329 {
330 CValue cval;
331 vsetc(type, VT_CONST, &cval);
332 }
333
334 /* push integer constant */
335 ST_FUNC void vpushi(int v)
336 {
337 CValue cval;
338 cval.i = v;
339 vsetc(&int_type, VT_CONST, &cval);
340 }
341
342 /* push a pointer sized constant */
343 static void vpushs(long long v)
344 {
345 CValue cval;
346 if (PTR_SIZE == 4)
347 cval.i = (int)v;
348 else
349 cval.ull = v;
350 vsetc(&size_type, VT_CONST, &cval);
351 }
352
353 /* push arbitrary 64bit constant */
354 void vpush64(int ty, unsigned long long v)
355 {
356 CValue cval;
357 CType ctype;
358 ctype.t = ty;
359 ctype.ref = NULL;
360 cval.ull = v;
361 vsetc(&ctype, VT_CONST, &cval);
362 }
363
364 /* push long long constant */
365 static inline void vpushll(long long v)
366 {
367 vpush64(VT_LLONG, v);
368 }
369
370 /* Return a static symbol pointing to a section */
371 ST_FUNC Sym *get_sym_ref(CType *type, Section *sec, unsigned long offset, unsigned long size)
372 {
373 int v;
374 Sym *sym;
375
376 v = anon_sym++;
377 sym = global_identifier_push(v, type->t | VT_STATIC, 0);
378 sym->type.ref = type->ref;
379 sym->r = VT_CONST | VT_SYM;
380 put_extern_sym(sym, sec, offset, size);
381 return sym;
382 }
383
384 /* push a reference to a section offset by adding a dummy symbol */
385 static void vpush_ref(CType *type, Section *sec, unsigned long offset, unsigned long size)
386 {
387 CValue cval;
388
389 cval.ul = 0;
390 vsetc(type, VT_CONST | VT_SYM, &cval);
391 vtop->sym = get_sym_ref(type, sec, offset, size);
392 }
393
394 /* define a new external reference to a symbol 'v' of type 'u' */
395 ST_FUNC Sym *external_global_sym(int v, CType *type, int r)
396 {
397 Sym *s;
398
399 s = sym_find(v);
400 if (!s) {
401 /* push forward reference */
402 s = global_identifier_push(v, type->t | VT_EXTERN, 0);
403 s->type.ref = type->ref;
404 s->r = r | VT_CONST | VT_SYM;
405 }
406 return s;
407 }
408
409 /* define a new external reference to a symbol 'v' with alternate asm
410 name 'asm_label' of type 'u'. 'asm_label' is equal to NULL if there
411 is no alternate name (most cases) */
412 static Sym *external_sym(int v, CType *type, int r, char *asm_label)
413 {
414 Sym *s;
415
416 s = sym_find(v);
417 if (!s) {
418 /* push forward reference */
419 s = sym_push(v, type, r | VT_CONST | VT_SYM, 0);
420 s->asm_label = asm_label;
421 s->type.t |= VT_EXTERN;
422 } else if (s->type.ref == func_old_type.ref) {
423 s->type.ref = type->ref;
424 s->r = r | VT_CONST | VT_SYM;
425 s->type.t |= VT_EXTERN;
426 } else if (!is_compatible_types(&s->type, type)) {
427 tcc_error("incompatible types for redefinition of '%s'",
428 get_tok_str(v, NULL));
429 }
430 return s;
431 }
432
433 /* push a reference to global symbol v */
434 ST_FUNC void vpush_global_sym(CType *type, int v)
435 {
436 Sym *sym;
437 CValue cval;
438
439 sym = external_global_sym(v, type, 0);
440 cval.ul = 0;
441 vsetc(type, VT_CONST | VT_SYM, &cval);
442 vtop->sym = sym;
443 }
444
445 ST_FUNC void vset(CType *type, int r, int v)
446 {
447 CValue cval;
448
449 cval.i = v;
450 vsetc(type, r, &cval);
451 }
452
453 static void vseti(int r, int v)
454 {
455 CType type;
456 type.t = VT_INT;
457 type.ref = 0;
458 vset(&type, r, v);
459 }
460
461 ST_FUNC void vswap(void)
462 {
463 SValue tmp;
464 /* cannot let cpu flags if other instruction are generated. Also
465 avoid leaving VT_JMP anywhere except on the top of the stack
466 because it would complicate the code generator. */
467 if (vtop >= vstack) {
468 int v = vtop->r & VT_VALMASK;
469 if (v == VT_CMP || (v & ~1) == VT_JMP)
470 gv(RC_INT);
471 }
472 tmp = vtop[0];
473 vtop[0] = vtop[-1];
474 vtop[-1] = tmp;
475
476 /* XXX: +2% overall speed possible with optimized memswap
477 *
478 * memswap(&vtop[0], &vtop[1], sizeof *vtop);
479 */
480 }
481
482 ST_FUNC void vpushv(SValue *v)
483 {
484 if (vtop >= vstack + (VSTACK_SIZE - 1))
485 tcc_error("memory full");
486 vtop++;
487 *vtop = *v;
488 }
489
490 static void vdup(void)
491 {
492 vpushv(vtop);
493 }
494
495 /* save r to the memory stack, and mark it as being free */
496 ST_FUNC void save_reg(int r)
497 {
498 int l, saved, size, align;
499 SValue *p, sv;
500 CType *type;
501
502 /* modify all stack values */
503 saved = 0;
504 l = 0;
505 for(p=vstack;p<=vtop;p++) {
506 if ((p->r & VT_VALMASK) == r ||
507 ((p->type.t & VT_BTYPE) == VT_LLONG && (p->r2 & VT_VALMASK) == r)) {
508 /* must save value on stack if not already done */
509 if (!saved) {
510 /* NOTE: must reload 'r' because r might be equal to r2 */
511 r = p->r & VT_VALMASK;
512 /* store register in the stack */
513 type = &p->type;
514 if ((p->r & VT_LVAL) ||
515 (!is_float(type->t) && (type->t & VT_BTYPE) != VT_LLONG))
516 #ifdef TCC_TARGET_X86_64
517 type = &char_pointer_type;
518 #else
519 type = &int_type;
520 #endif
521 size = type_size(type, &align);
522 loc = (loc - size) & -align;
523 sv.type.t = type->t;
524 sv.r = VT_LOCAL | VT_LVAL;
525 sv.c.ul = loc;
526 store(r, &sv);
527 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
528 /* x86 specific: need to pop fp register ST0 if saved */
529 if (r == TREG_ST0) {
530 o(0xd8dd); /* fstp %st(0) */
531 }
532 #endif
533 #ifndef TCC_TARGET_X86_64
534 /* special long long case */
535 if ((type->t & VT_BTYPE) == VT_LLONG) {
536 sv.c.ul += 4;
537 store(p->r2, &sv);
538 }
539 #endif
540 l = loc;
541 saved = 1;
542 }
543 /* mark that stack entry as being saved on the stack */
544 if (p->r & VT_LVAL) {
545 /* also clear the bounded flag because the
546 relocation address of the function was stored in
547 p->c.ul */
548 p->r = (p->r & ~(VT_VALMASK | VT_BOUNDED)) | VT_LLOCAL;
549 } else {
550 p->r = lvalue_type(p->type.t) | VT_LOCAL;
551 }
552 p->r2 = VT_CONST;
553 p->c.ul = l;
554 }
555 }
556 }
557
558 #ifdef TCC_TARGET_ARM
559 /* find a register of class 'rc2' with at most one reference on stack.
560 * If none, call get_reg(rc) */
561 ST_FUNC int get_reg_ex(int rc, int rc2)
562 {
563 int r;
564 SValue *p;
565
566 for(r=0;r<NB_REGS;r++) {
567 if (reg_classes[r] & rc2) {
568 int n;
569 n=0;
570 for(p = vstack; p <= vtop; p++) {
571 if ((p->r & VT_VALMASK) == r ||
572 (p->r2 & VT_VALMASK) == r)
573 n++;
574 }
575 if (n <= 1)
576 return r;
577 }
578 }
579 return get_reg(rc);
580 }
581 #endif
582
583 /* find a free register of class 'rc'. If none, save one register */
584 ST_FUNC int get_reg(int rc)
585 {
586 int r;
587 SValue *p;
588
589 /* find a free register */
590 for(r=0;r<NB_REGS;r++) {
591 if (reg_classes[r] & rc) {
592 for(p=vstack;p<=vtop;p++) {
593 if ((p->r & VT_VALMASK) == r ||
594 (p->r2 & VT_VALMASK) == r)
595 goto notfound;
596 }
597 return r;
598 }
599 notfound: ;
600 }
601
602 /* no register left : free the first one on the stack (VERY
603 IMPORTANT to start from the bottom to ensure that we don't
604 spill registers used in gen_opi()) */
605 for(p=vstack;p<=vtop;p++) {
606 /* look at second register (if long long) */
607 r = p->r2 & VT_VALMASK;
608 if (r < VT_CONST && (reg_classes[r] & rc))
609 goto save_found;
610 r = p->r & VT_VALMASK;
611 if (r < VT_CONST && (reg_classes[r] & rc)) {
612 save_found:
613 save_reg(r);
614 return r;
615 }
616 }
617 /* Should never comes here */
618 return -1;
619 }
620
621 /* save registers up to (vtop - n) stack entry */
622 ST_FUNC void save_regs(int n)
623 {
624 int r;
625 SValue *p, *p1;
626 p1 = vtop - n;
627 for(p = vstack;p <= p1; p++) {
628 r = p->r & VT_VALMASK;
629 if (r < VT_CONST) {
630 save_reg(r);
631 }
632 }
633 }
634
635 /* move register 's' (of type 't') to 'r', and flush previous value of r to memory
636 if needed */
637 static void move_reg(int r, int s, int t)
638 {
639 SValue sv;
640
641 if (r != s) {
642 save_reg(r);
643 sv.type.t = t;
644 sv.type.ref = NULL;
645 sv.r = s;
646 sv.c.ul = 0;
647 load(r, &sv);
648 }
649 }
650
651 /* get address of vtop (vtop MUST BE an lvalue) */
652 static void gaddrof(void)
653 {
654 if (vtop->r & VT_REF)
655 gv(RC_INT);
656 vtop->r &= ~VT_LVAL;
657 /* tricky: if saved lvalue, then we can go back to lvalue */
658 if ((vtop->r & VT_VALMASK) == VT_LLOCAL)
659 vtop->r = (vtop->r & ~(VT_VALMASK | VT_LVAL_TYPE)) | VT_LOCAL | VT_LVAL;
660
661
662 }
663
664 #ifdef CONFIG_TCC_BCHECK
665 /* generate lvalue bound code */
666 static void gbound(void)
667 {
668 int lval_type;
669 CType type1;
670
671 vtop->r &= ~VT_MUSTBOUND;
672 /* if lvalue, then use checking code before dereferencing */
673 if (vtop->r & VT_LVAL) {
674 /* if not VT_BOUNDED value, then make one */
675 if (!(vtop->r & VT_BOUNDED)) {
676 lval_type = vtop->r & (VT_LVAL_TYPE | VT_LVAL);
677 /* must save type because we must set it to int to get pointer */
678 type1 = vtop->type;
679 vtop->type.t = VT_INT;
680 gaddrof();
681 vpushi(0);
682 gen_bounded_ptr_add();
683 vtop->r |= lval_type;
684 vtop->type = type1;
685 }
686 /* then check for dereferencing */
687 gen_bounded_ptr_deref();
688 }
689 }
690 #endif
691
692 /* store vtop a register belonging to class 'rc'. lvalues are
693 converted to values. Cannot be used if cannot be converted to
694 register value (such as structures). */
695 ST_FUNC int gv(int rc)
696 {
697 int r, bit_pos, bit_size, size, align, i;
698 int rc2;
699
700 /* NOTE: get_reg can modify vstack[] */
701 if (vtop->type.t & VT_BITFIELD) {
702 CType type;
703 int bits = 32;
704 bit_pos = (vtop->type.t >> VT_STRUCT_SHIFT) & 0x3f;
705 bit_size = (vtop->type.t >> (VT_STRUCT_SHIFT + 6)) & 0x3f;
706 /* remove bit field info to avoid loops */
707 vtop->type.t &= ~(VT_BITFIELD | (-1 << VT_STRUCT_SHIFT));
708 /* cast to int to propagate signedness in following ops */
709 if ((vtop->type.t & VT_BTYPE) == VT_LLONG) {
710 type.t = VT_LLONG;
711 bits = 64;
712 } else
713 type.t = VT_INT;
714 if((vtop->type.t & VT_UNSIGNED) ||
715 (vtop->type.t & VT_BTYPE) == VT_BOOL)
716 type.t |= VT_UNSIGNED;
717 gen_cast(&type);
718 /* generate shifts */
719 vpushi(bits - (bit_pos + bit_size));
720 gen_op(TOK_SHL);
721 vpushi(bits - bit_size);
722 /* NOTE: transformed to SHR if unsigned */
723 gen_op(TOK_SAR);
724 r = gv(rc);
725 } else {
726 if (is_float(vtop->type.t) &&
727 (vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
728 Sym *sym;
729 int *ptr;
730 unsigned long offset;
731 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
732 CValue check;
733 #endif
734
735 /* XXX: unify with initializers handling ? */
736 /* CPUs usually cannot use float constants, so we store them
737 generically in data segment */
738 size = type_size(&vtop->type, &align);
739 offset = (data_section->data_offset + align - 1) & -align;
740 data_section->data_offset = offset;
741 /* XXX: not portable yet */
742 #if defined(__i386__) || defined(__x86_64__)
743 /* Zero pad x87 tenbyte long doubles */
744 if (size == LDOUBLE_SIZE) {
745 vtop->c.tab[2] &= 0xffff;
746 #if LDOUBLE_SIZE == 16
747 vtop->c.tab[3] = 0;
748 #endif
749 }
750 #endif
751 ptr = section_ptr_add(data_section, size);
752 size = size >> 2;
753 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
754 check.d = 1;
755 if(check.tab[0])
756 for(i=0;i<size;i++)
757 ptr[i] = vtop->c.tab[size-1-i];
758 else
759 #endif
760 for(i=0;i<size;i++)
761 ptr[i] = vtop->c.tab[i];
762 sym = get_sym_ref(&vtop->type, data_section, offset, size << 2);
763 vtop->r |= VT_LVAL | VT_SYM;
764 vtop->sym = sym;
765 vtop->c.ul = 0;
766 }
767 #ifdef CONFIG_TCC_BCHECK
768 if (vtop->r & VT_MUSTBOUND)
769 gbound();
770 #endif
771
772 r = vtop->r & VT_VALMASK;
773 rc2 = (rc & RC_FLOAT) ? RC_FLOAT : RC_INT;
774 if (rc == RC_IRET)
775 rc2 = RC_LRET;
776 #ifdef TCC_TARGET_X86_64
777 else if (rc == RC_FRET)
778 rc2 = RC_QRET;
779 #endif
780
781 /* need to reload if:
782 - constant
783 - lvalue (need to dereference pointer)
784 - already a register, but not in the right class */
785 if (r >= VT_CONST
786 || (vtop->r & VT_LVAL)
787 || !(reg_classes[r] & rc)
788 #ifdef TCC_TARGET_X86_64
789 || ((vtop->type.t & VT_BTYPE) == VT_QLONG && !(reg_classes[vtop->r2] & rc2))
790 || ((vtop->type.t & VT_BTYPE) == VT_QFLOAT && !(reg_classes[vtop->r2] & rc2))
791 #else
792 || ((vtop->type.t & VT_BTYPE) == VT_LLONG && !(reg_classes[vtop->r2] & rc2))
793 #endif
794 )
795 {
796 r = get_reg(rc);
797 #ifdef TCC_TARGET_X86_64
798 if (((vtop->type.t & VT_BTYPE) == VT_QLONG) || ((vtop->type.t & VT_BTYPE) == VT_QFLOAT)) {
799 int addr_type = VT_LLONG, load_size = 8, load_type = ((vtop->type.t & VT_BTYPE) == VT_QLONG) ? VT_LLONG : VT_DOUBLE;
800 #else
801 if ((vtop->type.t & VT_BTYPE) == VT_LLONG) {
802 int addr_type = VT_INT, load_size = 4, load_type = VT_INT;
803 #endif
804 int r2, original_type;
805 unsigned long long ll;
806 original_type = vtop->type.t;
807 /* two register type load : expand to two words
808 temporarily */
809 #ifndef TCC_TARGET_X86_64
810 if ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
811 /* load constant */
812 ll = vtop->c.ull;
813 vtop->c.ui = ll; /* first word */
814 load(r, vtop);
815 vtop->r = r; /* save register value */
816 vpushi(ll >> 32); /* second word */
817 } else
818 #endif
819 if (r >= VT_CONST || /* XXX: test to VT_CONST incorrect ? */
820 (vtop->r & VT_LVAL)) {
821 /* We do not want to modifier the long long
822 pointer here, so the safest (and less
823 efficient) is to save all the other registers
824 in the stack. XXX: totally inefficient. */
825 save_regs(1);
826 /* load from memory */
827 vtop->type.t = load_type;
828 load(r, vtop);
829 vdup();
830 vtop[-1].r = r; /* save register value */
831 /* increment pointer to get second word */
832 vtop->type.t = addr_type;
833 gaddrof();
834 vpushi(load_size);
835 gen_op('+');
836 vtop->r |= VT_LVAL;
837 vtop->type.t = load_type;
838 } else {
839 /* move registers */
840 load(r, vtop);
841 vdup();
842 vtop[-1].r = r; /* save register value */
843 vtop->r = vtop[-1].r2;
844 }
845 /* Allocate second register. Here we rely on the fact that
846 get_reg() tries first to free r2 of an SValue. */
847 r2 = get_reg(rc2);
848 load(r2, vtop);
849 vpop();
850 /* write second register */
851 vtop->r2 = r2;
852 vtop->type.t = original_type;
853 } else if ((vtop->r & VT_LVAL) && !is_float(vtop->type.t)) {
854 int t1, t;
855 /* lvalue of scalar type : need to use lvalue type
856 because of possible cast */
857 t = vtop->type.t;
858 t1 = t;
859 /* compute memory access type */
860 if (vtop->r & VT_REF)
861 #ifdef TCC_TARGET_X86_64
862 t = VT_PTR;
863 #else
864 t = VT_INT;
865 #endif
866 else if (vtop->r & VT_LVAL_BYTE)
867 t = VT_BYTE;
868 else if (vtop->r & VT_LVAL_SHORT)
869 t = VT_SHORT;
870 if (vtop->r & VT_LVAL_UNSIGNED)
871 t |= VT_UNSIGNED;
872 vtop->type.t = t;
873 load(r, vtop);
874 /* restore wanted type */
875 vtop->type.t = t1;
876 } else {
877 /* one register type load */
878 load(r, vtop);
879 }
880 }
881 vtop->r = r;
882 #ifdef TCC_TARGET_C67
883 /* uses register pairs for doubles */
884 if ((vtop->type.t & VT_BTYPE) == VT_DOUBLE)
885 vtop->r2 = r+1;
886 #endif
887 }
888 return r;
889 }
890
891 /* generate vtop[-1] and vtop[0] in resp. classes rc1 and rc2 */
892 ST_FUNC void gv2(int rc1, int rc2)
893 {
894 int v;
895
896 /* generate more generic register first. But VT_JMP or VT_CMP
897 values must be generated first in all cases to avoid possible
898 reload errors */
899 v = vtop[0].r & VT_VALMASK;
900 if (v != VT_CMP && (v & ~1) != VT_JMP && rc1 <= rc2) {
901 vswap();
902 gv(rc1);
903 vswap();
904 gv(rc2);
905 /* test if reload is needed for first register */
906 if ((vtop[-1].r & VT_VALMASK) >= VT_CONST) {
907 vswap();
908 gv(rc1);
909 vswap();
910 }
911 } else {
912 gv(rc2);
913 vswap();
914 gv(rc1);
915 vswap();
916 /* test if reload is needed for first register */
917 if ((vtop[0].r & VT_VALMASK) >= VT_CONST) {
918 gv(rc2);
919 }
920 }
921 }
922
923 /* wrapper around RC_FRET to return a register by type */
924 static int rc_fret(int t)
925 {
926 #ifdef TCC_TARGET_X86_64
927 if (t == VT_LDOUBLE) {
928 return RC_ST0;
929 }
930 #endif
931 return RC_FRET;
932 }
933
934 /* wrapper around REG_FRET to return a register by type */
935 static int reg_fret(int t)
936 {
937 #ifdef TCC_TARGET_X86_64
938 if (t == VT_LDOUBLE) {
939 return TREG_ST0;
940 }
941 #endif
942 return REG_FRET;
943 }
944
945 /* expand long long on stack in two int registers */
946 static void lexpand(void)
947 {
948 int u;
949
950 u = vtop->type.t & VT_UNSIGNED;
951 gv(RC_INT);
952 vdup();
953 vtop[0].r = vtop[-1].r2;
954 vtop[0].r2 = VT_CONST;
955 vtop[-1].r2 = VT_CONST;
956 vtop[0].type.t = VT_INT | u;
957 vtop[-1].type.t = VT_INT | u;
958 }
959
960 #ifdef TCC_TARGET_ARM
961 /* expand long long on stack */
962 ST_FUNC void lexpand_nr(void)
963 {
964 int u,v;
965
966 u = vtop->type.t & VT_UNSIGNED;
967 vdup();
968 vtop->r2 = VT_CONST;
969 vtop->type.t = VT_INT | u;
970 v=vtop[-1].r & (VT_VALMASK | VT_LVAL);
971 if (v == VT_CONST) {
972 vtop[-1].c.ui = vtop->c.ull;
973 vtop->c.ui = vtop->c.ull >> 32;
974 vtop->r = VT_CONST;
975 } else if (v == (VT_LVAL|VT_CONST) || v == (VT_LVAL|VT_LOCAL)) {
976 vtop->c.ui += 4;
977 vtop->r = vtop[-1].r;
978 } else if (v > VT_CONST) {
979 vtop--;
980 lexpand();
981 } else
982 vtop->r = vtop[-1].r2;
983 vtop[-1].r2 = VT_CONST;
984 vtop[-1].type.t = VT_INT | u;
985 }
986 #endif
987
988 /* build a long long from two ints */
989 static void lbuild(int t)
990 {
991 gv2(RC_INT, RC_INT);
992 vtop[-1].r2 = vtop[0].r;
993 vtop[-1].type.t = t;
994 vpop();
995 }
996
997 /* rotate n first stack elements to the bottom
998 I1 ... In -> I2 ... In I1 [top is right]
999 */
1000 ST_FUNC void vrotb(int n)
1001 {
1002 int i;
1003 SValue tmp;
1004
1005 tmp = vtop[-n + 1];
1006 for(i=-n+1;i!=0;i++)
1007 vtop[i] = vtop[i+1];
1008 vtop[0] = tmp;
1009 }
1010
1011 /* rotate the n elements before entry e towards the top
1012 I1 ... In ... -> In I1 ... I(n-1) ... [top is right]
1013 */
1014 ST_FUNC void vrote(SValue *e, int n)
1015 {
1016 int i;
1017 SValue tmp;
1018
1019 tmp = *e;
1020 for(i = 0;i < n - 1; i++)
1021 e[-i] = e[-i - 1];
1022 e[-n + 1] = tmp;
1023 }
1024
1025 /* rotate n first stack elements to the top
1026 I1 ... In -> In I1 ... I(n-1) [top is right]
1027 */
1028 ST_FUNC void vrott(int n)
1029 {
1030 vrote(vtop, n);
1031 }
1032
1033 /* pop stack value */
1034 ST_FUNC void vpop(void)
1035 {
1036 int v;
1037 v = vtop->r & VT_VALMASK;
1038 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
1039 /* for x86, we need to pop the FP stack */
1040 if (v == TREG_ST0 && !nocode_wanted) {
1041 o(0xd8dd); /* fstp %st(0) */
1042 } else
1043 #endif
1044 if (v == VT_JMP || v == VT_JMPI) {
1045 /* need to put correct jump if && or || without test */
1046 gsym(vtop->c.ul);
1047 }
1048 vtop--;
1049 }
1050
1051 /* convert stack entry to register and duplicate its value in another
1052 register */
1053 static void gv_dup(void)
1054 {
1055 int rc, t, r, r1;
1056 SValue sv;
1057
1058 t = vtop->type.t;
1059 if ((t & VT_BTYPE) == VT_LLONG) {
1060 lexpand();
1061 gv_dup();
1062 vswap();
1063 vrotb(3);
1064 gv_dup();
1065 vrotb(4);
1066 /* stack: H L L1 H1 */
1067 lbuild(t);
1068 vrotb(3);
1069 vrotb(3);
1070 vswap();
1071 lbuild(t);
1072 vswap();
1073 } else {
1074 /* duplicate value */
1075 rc = RC_INT;
1076 sv.type.t = VT_INT;
1077 if (is_float(t)) {
1078 rc = RC_FLOAT;
1079 #ifdef TCC_TARGET_X86_64
1080 if ((t & VT_BTYPE) == VT_LDOUBLE) {
1081 rc = RC_ST0;
1082 }
1083 #endif
1084 sv.type.t = t;
1085 }
1086 r = gv(rc);
1087 r1 = get_reg(rc);
1088 sv.r = r;
1089 sv.c.ul = 0;
1090 load(r1, &sv); /* move r to r1 */
1091 vdup();
1092 /* duplicates value */
1093 if (r != r1)
1094 vtop->r = r1;
1095 }
1096 }
1097
1098 #ifndef TCC_TARGET_X86_64
1099 /* generate CPU independent (unsigned) long long operations */
1100 static void gen_opl(int op)
1101 {
1102 int t, a, b, op1, c, i;
1103 int func;
1104 unsigned short reg_iret = REG_IRET;
1105 unsigned short reg_lret = REG_LRET;
1106 SValue tmp;
1107
1108 switch(op) {
1109 case '/':
1110 case TOK_PDIV:
1111 func = TOK___divdi3;
1112 goto gen_func;
1113 case TOK_UDIV:
1114 func = TOK___udivdi3;
1115 goto gen_func;
1116 case '%':
1117 func = TOK___moddi3;
1118 goto gen_mod_func;
1119 case TOK_UMOD:
1120 func = TOK___umoddi3;
1121 gen_mod_func:
1122 #ifdef TCC_ARM_EABI
1123 reg_iret = TREG_R2;
1124 reg_lret = TREG_R3;
1125 #endif
1126 gen_func:
1127 /* call generic long long function */
1128 vpush_global_sym(&func_old_type, func);
1129 vrott(3);
1130 gfunc_call(2);
1131 vpushi(0);
1132 vtop->r = reg_iret;
1133 vtop->r2 = reg_lret;
1134 break;
1135 case '^':
1136 case '&':
1137 case '|':
1138 case '*':
1139 case '+':
1140 case '-':
1141 t = vtop->type.t;
1142 vswap();
1143 lexpand();
1144 vrotb(3);
1145 lexpand();
1146 /* stack: L1 H1 L2 H2 */
1147 tmp = vtop[0];
1148 vtop[0] = vtop[-3];
1149 vtop[-3] = tmp;
1150 tmp = vtop[-2];
1151 vtop[-2] = vtop[-3];
1152 vtop[-3] = tmp;
1153 vswap();
1154 /* stack: H1 H2 L1 L2 */
1155 if (op == '*') {
1156 vpushv(vtop - 1);
1157 vpushv(vtop - 1);
1158 gen_op(TOK_UMULL);
1159 lexpand();
1160 /* stack: H1 H2 L1 L2 ML MH */
1161 for(i=0;i<4;i++)
1162 vrotb(6);
1163 /* stack: ML MH H1 H2 L1 L2 */
1164 tmp = vtop[0];
1165 vtop[0] = vtop[-2];
1166 vtop[-2] = tmp;
1167 /* stack: ML MH H1 L2 H2 L1 */
1168 gen_op('*');
1169 vrotb(3);
1170 vrotb(3);
1171 gen_op('*');
1172 /* stack: ML MH M1 M2 */
1173 gen_op('+');
1174 gen_op('+');
1175 } else if (op == '+' || op == '-') {
1176 /* XXX: add non carry method too (for MIPS or alpha) */
1177 if (op == '+')
1178 op1 = TOK_ADDC1;
1179 else
1180 op1 = TOK_SUBC1;
1181 gen_op(op1);
1182 /* stack: H1 H2 (L1 op L2) */
1183 vrotb(3);
1184 vrotb(3);
1185 gen_op(op1 + 1); /* TOK_xxxC2 */
1186 } else {
1187 gen_op(op);
1188 /* stack: H1 H2 (L1 op L2) */
1189 vrotb(3);
1190 vrotb(3);
1191 /* stack: (L1 op L2) H1 H2 */
1192 gen_op(op);
1193 /* stack: (L1 op L2) (H1 op H2) */
1194 }
1195 /* stack: L H */
1196 lbuild(t);
1197 break;
1198 case TOK_SAR:
1199 case TOK_SHR:
1200 case TOK_SHL:
1201 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
1202 t = vtop[-1].type.t;
1203 vswap();
1204 lexpand();
1205 vrotb(3);
1206 /* stack: L H shift */
1207 c = (int)vtop->c.i;
1208 /* constant: simpler */
1209 /* NOTE: all comments are for SHL. the other cases are
1210 done by swaping words */
1211 vpop();
1212 if (op != TOK_SHL)
1213 vswap();
1214 if (c >= 32) {
1215 /* stack: L H */
1216 vpop();
1217 if (c > 32) {
1218 vpushi(c - 32);
1219 gen_op(op);
1220 }
1221 if (op != TOK_SAR) {
1222 vpushi(0);
1223 } else {
1224 gv_dup();
1225 vpushi(31);
1226 gen_op(TOK_SAR);
1227 }
1228 vswap();
1229 } else {
1230 vswap();
1231 gv_dup();
1232 /* stack: H L L */
1233 vpushi(c);
1234 gen_op(op);
1235 vswap();
1236 vpushi(32 - c);
1237 if (op == TOK_SHL)
1238 gen_op(TOK_SHR);
1239 else
1240 gen_op(TOK_SHL);
1241 vrotb(3);
1242 /* stack: L L H */
1243 vpushi(c);
1244 if (op == TOK_SHL)
1245 gen_op(TOK_SHL);
1246 else
1247 gen_op(TOK_SHR);
1248 gen_op('|');
1249 }
1250 if (op != TOK_SHL)
1251 vswap();
1252 lbuild(t);
1253 } else {
1254 /* XXX: should provide a faster fallback on x86 ? */
1255 switch(op) {
1256 case TOK_SAR:
1257 func = TOK___ashrdi3;
1258 goto gen_func;
1259 case TOK_SHR:
1260 func = TOK___lshrdi3;
1261 goto gen_func;
1262 case TOK_SHL:
1263 func = TOK___ashldi3;
1264 goto gen_func;
1265 }
1266 }
1267 break;
1268 default:
1269 /* compare operations */
1270 t = vtop->type.t;
1271 vswap();
1272 lexpand();
1273 vrotb(3);
1274 lexpand();
1275 /* stack: L1 H1 L2 H2 */
1276 tmp = vtop[-1];
1277 vtop[-1] = vtop[-2];
1278 vtop[-2] = tmp;
1279 /* stack: L1 L2 H1 H2 */
1280 /* compare high */
1281 op1 = op;
1282 /* when values are equal, we need to compare low words. since
1283 the jump is inverted, we invert the test too. */
1284 if (op1 == TOK_LT)
1285 op1 = TOK_LE;
1286 else if (op1 == TOK_GT)
1287 op1 = TOK_GE;
1288 else if (op1 == TOK_ULT)
1289 op1 = TOK_ULE;
1290 else if (op1 == TOK_UGT)
1291 op1 = TOK_UGE;
1292 a = 0;
1293 b = 0;
1294 gen_op(op1);
1295 if (op1 != TOK_NE) {
1296 a = gtst(1, 0);
1297 }
1298 if (op != TOK_EQ) {
1299 /* generate non equal test */
1300 /* XXX: NOT PORTABLE yet */
1301 if (a == 0) {
1302 b = gtst(0, 0);
1303 } else {
1304 #if defined(TCC_TARGET_I386)
1305 b = psym(0x850f, 0);
1306 #elif defined(TCC_TARGET_ARM)
1307 b = ind;
1308 o(0x1A000000 | encbranch(ind, 0, 1));
1309 #elif defined(TCC_TARGET_C67)
1310 tcc_error("not implemented");
1311 #else
1312 #error not supported
1313 #endif
1314 }
1315 }
1316 /* compare low. Always unsigned */
1317 op1 = op;
1318 if (op1 == TOK_LT)
1319 op1 = TOK_ULT;
1320 else if (op1 == TOK_LE)
1321 op1 = TOK_ULE;
1322 else if (op1 == TOK_GT)
1323 op1 = TOK_UGT;
1324 else if (op1 == TOK_GE)
1325 op1 = TOK_UGE;
1326 gen_op(op1);
1327 a = gtst(1, a);
1328 gsym(b);
1329 vseti(VT_JMPI, a);
1330 break;
1331 }
1332 }
1333 #endif
1334
1335 /* handle integer constant optimizations and various machine
1336 independent opt */
1337 static void gen_opic(int op)
1338 {
1339 int c1, c2, t1, t2, n;
1340 SValue *v1, *v2;
1341 long long l1, l2;
1342 typedef unsigned long long U;
1343
1344 v1 = vtop - 1;
1345 v2 = vtop;
1346 t1 = v1->type.t & VT_BTYPE;
1347 t2 = v2->type.t & VT_BTYPE;
1348
1349 if (t1 == VT_LLONG)
1350 l1 = v1->c.ll;
1351 else if (v1->type.t & VT_UNSIGNED)
1352 l1 = v1->c.ui;
1353 else
1354 l1 = v1->c.i;
1355
1356 if (t2 == VT_LLONG)
1357 l2 = v2->c.ll;
1358 else if (v2->type.t & VT_UNSIGNED)
1359 l2 = v2->c.ui;
1360 else
1361 l2 = v2->c.i;
1362
1363 /* currently, we cannot do computations with forward symbols */
1364 c1 = (v1->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1365 c2 = (v2->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1366 if (c1 && c2) {
1367 switch(op) {
1368 case '+': l1 += l2; break;
1369 case '-': l1 -= l2; break;
1370 case '&': l1 &= l2; break;
1371 case '^': l1 ^= l2; break;
1372 case '|': l1 |= l2; break;
1373 case '*': l1 *= l2; break;
1374
1375 case TOK_PDIV:
1376 case '/':
1377 case '%':
1378 case TOK_UDIV:
1379 case TOK_UMOD:
1380 /* if division by zero, generate explicit division */
1381 if (l2 == 0) {
1382 if (const_wanted)
1383 tcc_error("division by zero in constant");
1384 goto general_case;
1385 }
1386 switch(op) {
1387 default: l1 /= l2; break;
1388 case '%': l1 %= l2; break;
1389 case TOK_UDIV: l1 = (U)l1 / l2; break;
1390 case TOK_UMOD: l1 = (U)l1 % l2; break;
1391 }
1392 break;
1393 case TOK_SHL: l1 <<= l2; break;
1394 case TOK_SHR: l1 = (U)l1 >> l2; break;
1395 case TOK_SAR: l1 >>= l2; break;
1396 /* tests */
1397 case TOK_ULT: l1 = (U)l1 < (U)l2; break;
1398 case TOK_UGE: l1 = (U)l1 >= (U)l2; break;
1399 case TOK_EQ: l1 = l1 == l2; break;
1400 case TOK_NE: l1 = l1 != l2; break;
1401 case TOK_ULE: l1 = (U)l1 <= (U)l2; break;
1402 case TOK_UGT: l1 = (U)l1 > (U)l2; break;
1403 case TOK_LT: l1 = l1 < l2; break;
1404 case TOK_GE: l1 = l1 >= l2; break;
1405 case TOK_LE: l1 = l1 <= l2; break;
1406 case TOK_GT: l1 = l1 > l2; break;
1407 /* logical */
1408 case TOK_LAND: l1 = l1 && l2; break;
1409 case TOK_LOR: l1 = l1 || l2; break;
1410 default:
1411 goto general_case;
1412 }
1413 v1->c.ll = l1;
1414 vtop--;
1415 } else {
1416 /* if commutative ops, put c2 as constant */
1417 if (c1 && (op == '+' || op == '&' || op == '^' ||
1418 op == '|' || op == '*')) {
1419 vswap();
1420 c2 = c1; //c = c1, c1 = c2, c2 = c;
1421 l2 = l1; //l = l1, l1 = l2, l2 = l;
1422 }
1423 /* Filter out NOP operations like x*1, x-0, x&-1... */
1424 if (c2 && (((op == '*' || op == '/' || op == TOK_UDIV ||
1425 op == TOK_PDIV) &&
1426 l2 == 1) ||
1427 ((op == '+' || op == '-' || op == '|' || op == '^' ||
1428 op == TOK_SHL || op == TOK_SHR || op == TOK_SAR) &&
1429 l2 == 0) ||
1430 (op == '&' &&
1431 l2 == -1))) {
1432 /* nothing to do */
1433 vtop--;
1434 } else if (c2 && (op == '*' || op == TOK_PDIV || op == TOK_UDIV)) {
1435 /* try to use shifts instead of muls or divs */
1436 if (l2 > 0 && (l2 & (l2 - 1)) == 0) {
1437 n = -1;
1438 while (l2) {
1439 l2 >>= 1;
1440 n++;
1441 }
1442 vtop->c.ll = n;
1443 if (op == '*')
1444 op = TOK_SHL;
1445 else if (op == TOK_PDIV)
1446 op = TOK_SAR;
1447 else
1448 op = TOK_SHR;
1449 }
1450 goto general_case;
1451 } else if (c2 && (op == '+' || op == '-') &&
1452 (((vtop[-1].r & (VT_VALMASK | VT_LVAL | VT_SYM)) == (VT_CONST | VT_SYM))
1453 || (vtop[-1].r & (VT_VALMASK | VT_LVAL)) == VT_LOCAL)) {
1454 /* symbol + constant case */
1455 if (op == '-')
1456 l2 = -l2;
1457 vtop--;
1458 vtop->c.ll += l2;
1459 } else {
1460 general_case:
1461 if (!nocode_wanted) {
1462 /* call low level op generator */
1463 if (t1 == VT_LLONG || t2 == VT_LLONG)
1464 gen_opl(op);
1465 else
1466 gen_opi(op);
1467 } else {
1468 vtop--;
1469 }
1470 }
1471 }
1472 }
1473
1474 /* generate a floating point operation with constant propagation */
1475 static void gen_opif(int op)
1476 {
1477 int c1, c2;
1478 SValue *v1, *v2;
1479 long double f1, f2;
1480
1481 v1 = vtop - 1;
1482 v2 = vtop;
1483 /* currently, we cannot do computations with forward symbols */
1484 c1 = (v1->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1485 c2 = (v2->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1486 if (c1 && c2) {
1487 if (v1->type.t == VT_FLOAT) {
1488 f1 = v1->c.f;
1489 f2 = v2->c.f;
1490 } else if (v1->type.t == VT_DOUBLE) {
1491 f1 = v1->c.d;
1492 f2 = v2->c.d;
1493 } else {
1494 f1 = v1->c.ld;
1495 f2 = v2->c.ld;
1496 }
1497
1498 /* NOTE: we only do constant propagation if finite number (not
1499 NaN or infinity) (ANSI spec) */
1500 if (!ieee_finite(f1) || !ieee_finite(f2))
1501 goto general_case;
1502
1503 switch(op) {
1504 case '+': f1 += f2; break;
1505 case '-': f1 -= f2; break;
1506 case '*': f1 *= f2; break;
1507 case '/':
1508 if (f2 == 0.0) {
1509 if (const_wanted)
1510 tcc_error("division by zero in constant");
1511 goto general_case;
1512 }
1513 f1 /= f2;
1514 break;
1515 /* XXX: also handles tests ? */
1516 default:
1517 goto general_case;
1518 }
1519 /* XXX: overflow test ? */
1520 if (v1->type.t == VT_FLOAT) {
1521 v1->c.f = f1;
1522 } else if (v1->type.t == VT_DOUBLE) {
1523 v1->c.d = f1;
1524 } else {
1525 v1->c.ld = f1;
1526 }
1527 vtop--;
1528 } else {
1529 general_case:
1530 if (!nocode_wanted) {
1531 gen_opf(op);
1532 } else {
1533 vtop--;
1534 }
1535 }
1536 }
1537
1538 static int pointed_size(CType *type)
1539 {
1540 int align;
1541 return type_size(pointed_type(type), &align);
1542 }
1543
1544 static void vla_runtime_pointed_size(CType *type)
1545 {
1546 int align;
1547 vla_runtime_type_size(pointed_type(type), &align);
1548 }
1549
1550 static inline int is_null_pointer(SValue *p)
1551 {
1552 if ((p->r & (VT_VALMASK | VT_LVAL | VT_SYM)) != VT_CONST)
1553 return 0;
1554 return ((p->type.t & VT_BTYPE) == VT_INT && p->c.i == 0) ||
1555 ((p->type.t & VT_BTYPE) == VT_LLONG && p->c.ll == 0) ||
1556 ((p->type.t & VT_BTYPE) == VT_PTR && p->c.ptr == 0);
1557 }
1558
1559 static inline int is_integer_btype(int bt)
1560 {
1561 return (bt == VT_BYTE || bt == VT_SHORT ||
1562 bt == VT_INT || bt == VT_LLONG);
1563 }
1564
1565 /* check types for comparison or substraction of pointers */
1566 static void check_comparison_pointer_types(SValue *p1, SValue *p2, int op)
1567 {
1568 CType *type1, *type2, tmp_type1, tmp_type2;
1569 int bt1, bt2;
1570
1571 /* null pointers are accepted for all comparisons as gcc */
1572 if (is_null_pointer(p1) || is_null_pointer(p2))
1573 return;
1574 type1 = &p1->type;
1575 type2 = &p2->type;
1576 bt1 = type1->t & VT_BTYPE;
1577 bt2 = type2->t & VT_BTYPE;
1578 /* accept comparison between pointer and integer with a warning */
1579 if ((is_integer_btype(bt1) || is_integer_btype(bt2)) && op != '-') {
1580 if (op != TOK_LOR && op != TOK_LAND )
1581 tcc_warning("comparison between pointer and integer");
1582 return;
1583 }
1584
1585 /* both must be pointers or implicit function pointers */
1586 if (bt1 == VT_PTR) {
1587 type1 = pointed_type(type1);
1588 } else if (bt1 != VT_FUNC)
1589 goto invalid_operands;
1590
1591 if (bt2 == VT_PTR) {
1592 type2 = pointed_type(type2);
1593 } else if (bt2 != VT_FUNC) {
1594 invalid_operands:
1595 tcc_error("invalid operands to binary %s", get_tok_str(op, NULL));
1596 }
1597 if ((type1->t & VT_BTYPE) == VT_VOID ||
1598 (type2->t & VT_BTYPE) == VT_VOID)
1599 return;
1600 tmp_type1 = *type1;
1601 tmp_type2 = *type2;
1602 tmp_type1.t &= ~(VT_UNSIGNED | VT_CONSTANT | VT_VOLATILE);
1603 tmp_type2.t &= ~(VT_UNSIGNED | VT_CONSTANT | VT_VOLATILE);
1604 if (!is_compatible_types(&tmp_type1, &tmp_type2)) {
1605 /* gcc-like error if '-' is used */
1606 if (op == '-')
1607 goto invalid_operands;
1608 else
1609 tcc_warning("comparison of distinct pointer types lacks a cast");
1610 }
1611 }
1612
1613 /* generic gen_op: handles types problems */
1614 ST_FUNC void gen_op(int op)
1615 {
1616 int u, t1, t2, bt1, bt2, t;
1617 CType type1;
1618
1619 t1 = vtop[-1].type.t;
1620 t2 = vtop[0].type.t;
1621 bt1 = t1 & VT_BTYPE;
1622 bt2 = t2 & VT_BTYPE;
1623
1624 if (bt1 == VT_PTR || bt2 == VT_PTR) {
1625 /* at least one operand is a pointer */
1626 /* relationnal op: must be both pointers */
1627 if (op >= TOK_ULT && op <= TOK_LOR) {
1628 check_comparison_pointer_types(vtop - 1, vtop, op);
1629 /* pointers are handled are unsigned */
1630 #ifdef TCC_TARGET_X86_64
1631 t = VT_LLONG | VT_UNSIGNED;
1632 #else
1633 t = VT_INT | VT_UNSIGNED;
1634 #endif
1635 goto std_op;
1636 }
1637 /* if both pointers, then it must be the '-' op */
1638 if (bt1 == VT_PTR && bt2 == VT_PTR) {
1639 if (op != '-')
1640 tcc_error("cannot use pointers here");
1641 check_comparison_pointer_types(vtop - 1, vtop, op);
1642 /* XXX: check that types are compatible */
1643 if (vtop[-1].type.t & VT_VLA) {
1644 vla_runtime_pointed_size(&vtop[-1].type);
1645 } else {
1646 vpushi(pointed_size(&vtop[-1].type));
1647 }
1648 vrott(3);
1649 gen_opic(op);
1650 /* set to integer type */
1651 #ifdef TCC_TARGET_X86_64
1652 vtop->type.t = VT_LLONG;
1653 #else
1654 vtop->type.t = VT_INT;
1655 #endif
1656 vswap();
1657 gen_op(TOK_PDIV);
1658 } else {
1659 /* exactly one pointer : must be '+' or '-'. */
1660 if (op != '-' && op != '+')
1661 tcc_error("cannot use pointers here");
1662 /* Put pointer as first operand */
1663 if (bt2 == VT_PTR) {
1664 vswap();
1665 swap(&t1, &t2);
1666 }
1667 type1 = vtop[-1].type;
1668 type1.t &= ~VT_ARRAY;
1669 if (vtop[-1].type.t & VT_VLA)
1670 vla_runtime_pointed_size(&vtop[-1].type);
1671 else {
1672 u = pointed_size(&vtop[-1].type);
1673 if (u < 0)
1674 tcc_error("unknown array element size");
1675 #ifdef TCC_TARGET_X86_64
1676 vpushll(u);
1677 #else
1678 /* XXX: cast to int ? (long long case) */
1679 vpushi(u);
1680 #endif
1681 }
1682 gen_op('*');
1683 #ifdef CONFIG_TCC_BCHECK
1684 /* if evaluating constant expression, no code should be
1685 generated, so no bound check */
1686 if (tcc_state->do_bounds_check && !const_wanted) {
1687 /* if bounded pointers, we generate a special code to
1688 test bounds */
1689 if (op == '-') {
1690 vpushi(0);
1691 vswap();
1692 gen_op('-');
1693 }
1694 gen_bounded_ptr_add();
1695 } else
1696 #endif
1697 {
1698 gen_opic(op);
1699 }
1700 /* put again type if gen_opic() swaped operands */
1701 vtop->type = type1;
1702 }
1703 } else if (is_float(bt1) || is_float(bt2)) {
1704 /* compute bigger type and do implicit casts */
1705 if (bt1 == VT_LDOUBLE || bt2 == VT_LDOUBLE) {
1706 t = VT_LDOUBLE;
1707 } else if (bt1 == VT_DOUBLE || bt2 == VT_DOUBLE) {
1708 t = VT_DOUBLE;
1709 } else {
1710 t = VT_FLOAT;
1711 }
1712 /* floats can only be used for a few operations */
1713 if (op != '+' && op != '-' && op != '*' && op != '/' &&
1714 (op < TOK_ULT || op > TOK_GT))
1715 tcc_error("invalid operands for binary operation");
1716 goto std_op;
1717 } else if (op == TOK_SHR || op == TOK_SAR || op == TOK_SHL) {
1718 t = bt1 == VT_LLONG ? VT_LLONG : VT_INT;
1719 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (t | VT_UNSIGNED))
1720 t |= VT_UNSIGNED;
1721 goto std_op;
1722 } else if (bt1 == VT_LLONG || bt2 == VT_LLONG) {
1723 /* cast to biggest op */
1724 t = VT_LLONG;
1725 /* convert to unsigned if it does not fit in a long long */
1726 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED) ||
1727 (t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED))
1728 t |= VT_UNSIGNED;
1729 goto std_op;
1730 } else if (bt1 == VT_STRUCT || bt2 == VT_STRUCT) {
1731 tcc_error("comparison of struct");
1732 } else {
1733 /* integer operations */
1734 t = VT_INT;
1735 /* convert to unsigned if it does not fit in an integer */
1736 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED) ||
1737 (t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED))
1738 t |= VT_UNSIGNED;
1739 std_op:
1740 /* XXX: currently, some unsigned operations are explicit, so
1741 we modify them here */
1742 if (t & VT_UNSIGNED) {
1743 if (op == TOK_SAR)
1744 op = TOK_SHR;
1745 else if (op == '/')
1746 op = TOK_UDIV;
1747 else if (op == '%')
1748 op = TOK_UMOD;
1749 else if (op == TOK_LT)
1750 op = TOK_ULT;
1751 else if (op == TOK_GT)
1752 op = TOK_UGT;
1753 else if (op == TOK_LE)
1754 op = TOK_ULE;
1755 else if (op == TOK_GE)
1756 op = TOK_UGE;
1757 }
1758 vswap();
1759 type1.t = t;
1760 gen_cast(&type1);
1761 vswap();
1762 /* special case for shifts and long long: we keep the shift as
1763 an integer */
1764 if (op == TOK_SHR || op == TOK_SAR || op == TOK_SHL)
1765 type1.t = VT_INT;
1766 gen_cast(&type1);
1767 if (is_float(t))
1768 gen_opif(op);
1769 else
1770 gen_opic(op);
1771 if (op >= TOK_ULT && op <= TOK_GT) {
1772 /* relationnal op: the result is an int */
1773 vtop->type.t = VT_INT;
1774 } else {
1775 vtop->type.t = t;
1776 }
1777 }
1778 }
1779
1780 #ifndef TCC_TARGET_ARM
1781 /* generic itof for unsigned long long case */
1782 static void gen_cvt_itof1(int t)
1783 {
1784 if ((vtop->type.t & (VT_BTYPE | VT_UNSIGNED)) ==
1785 (VT_LLONG | VT_UNSIGNED)) {
1786
1787 if (t == VT_FLOAT)
1788 vpush_global_sym(&func_old_type, TOK___floatundisf);
1789 #if LDOUBLE_SIZE != 8
1790 else if (t == VT_LDOUBLE)
1791 vpush_global_sym(&func_old_type, TOK___floatundixf);
1792 #endif
1793 else
1794 vpush_global_sym(&func_old_type, TOK___floatundidf);
1795 vrott(2);
1796 gfunc_call(1);
1797 vpushi(0);
1798 vtop->r = reg_fret(t);
1799 } else {
1800 gen_cvt_itof(t);
1801 }
1802 }
1803 #endif
1804
1805 /* generic ftoi for unsigned long long case */
1806 static void gen_cvt_ftoi1(int t)
1807 {
1808 int st;
1809
1810 if (t == (VT_LLONG | VT_UNSIGNED)) {
1811 /* not handled natively */
1812 st = vtop->type.t & VT_BTYPE;
1813 if (st == VT_FLOAT)
1814 vpush_global_sym(&func_old_type, TOK___fixunssfdi);
1815 #if LDOUBLE_SIZE != 8
1816 else if (st == VT_LDOUBLE)
1817 vpush_global_sym(&func_old_type, TOK___fixunsxfdi);
1818 #endif
1819 else
1820 vpush_global_sym(&func_old_type, TOK___fixunsdfdi);
1821 vrott(2);
1822 gfunc_call(1);
1823 vpushi(0);
1824 vtop->r = REG_IRET;
1825 vtop->r2 = REG_LRET;
1826 } else {
1827 gen_cvt_ftoi(t);
1828 }
1829 }
1830
1831 /* force char or short cast */
1832 static void force_charshort_cast(int t)
1833 {
1834 int bits, dbt;
1835 dbt = t & VT_BTYPE;
1836 /* XXX: add optimization if lvalue : just change type and offset */
1837 if (dbt == VT_BYTE)
1838 bits = 8;
1839 else
1840 bits = 16;
1841 if (t & VT_UNSIGNED) {
1842 vpushi((1 << bits) - 1);
1843 gen_op('&');
1844 } else {
1845 bits = 32 - bits;
1846 vpushi(bits);
1847 gen_op(TOK_SHL);
1848 /* result must be signed or the SAR is converted to an SHL
1849 This was not the case when "t" was a signed short
1850 and the last value on the stack was an unsigned int */
1851 vtop->type.t &= ~VT_UNSIGNED;
1852 vpushi(bits);
1853 gen_op(TOK_SAR);
1854 }
1855 }
1856
1857 /* cast 'vtop' to 'type'. Casting to bitfields is forbidden. */
1858 static void gen_cast(CType *type)
1859 {
1860 int sbt, dbt, sf, df, c, p;
1861
1862 /* special delayed cast for char/short */
1863 /* XXX: in some cases (multiple cascaded casts), it may still
1864 be incorrect */
1865 if (vtop->r & VT_MUSTCAST) {
1866 vtop->r &= ~VT_MUSTCAST;
1867 force_charshort_cast(vtop->type.t);
1868 }
1869
1870 /* bitfields first get cast to ints */
1871 if (vtop->type.t & VT_BITFIELD) {
1872 gv(RC_INT);
1873 }
1874
1875 dbt = type->t & (VT_BTYPE | VT_UNSIGNED);
1876 sbt = vtop->type.t & (VT_BTYPE | VT_UNSIGNED);
1877
1878 if (sbt != dbt) {
1879 sf = is_float(sbt);
1880 df = is_float(dbt);
1881 c = (vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1882 p = (vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == (VT_CONST | VT_SYM);
1883 if (c) {
1884 /* constant case: we can do it now */
1885 /* XXX: in ISOC, cannot do it if error in convert */
1886 if (sbt == VT_FLOAT)
1887 vtop->c.ld = vtop->c.f;
1888 else if (sbt == VT_DOUBLE)
1889 vtop->c.ld = vtop->c.d;
1890
1891 if (df) {
1892 if ((sbt & VT_BTYPE) == VT_LLONG) {
1893 if (sbt & VT_UNSIGNED)
1894 vtop->c.ld = vtop->c.ull;
1895 else
1896 vtop->c.ld = vtop->c.ll;
1897 } else if(!sf) {
1898 if (sbt & VT_UNSIGNED)
1899 vtop->c.ld = vtop->c.ui;
1900 else
1901 vtop->c.ld = vtop->c.i;
1902 }
1903
1904 if (dbt == VT_FLOAT)
1905 vtop->c.f = (float)vtop->c.ld;
1906 else if (dbt == VT_DOUBLE)
1907 vtop->c.d = (double)vtop->c.ld;
1908 } else if (sf && dbt == (VT_LLONG|VT_UNSIGNED)) {
1909 vtop->c.ull = (unsigned long long)vtop->c.ld;
1910 } else if (sf && dbt == VT_BOOL) {
1911 vtop->c.i = (vtop->c.ld != 0);
1912 } else {
1913 if(sf)
1914 vtop->c.ll = (long long)vtop->c.ld;
1915 else if (sbt == (VT_LLONG|VT_UNSIGNED))
1916 vtop->c.ll = vtop->c.ull;
1917 else if (sbt & VT_UNSIGNED)
1918 vtop->c.ll = vtop->c.ui;
1919 #ifdef TCC_TARGET_X86_64
1920 else if (sbt == VT_PTR)
1921 ;
1922 #endif
1923 else if (sbt != VT_LLONG)
1924 vtop->c.ll = vtop->c.i;
1925
1926 if (dbt == (VT_LLONG|VT_UNSIGNED))
1927 vtop->c.ull = vtop->c.ll;
1928 else if (dbt == VT_BOOL)
1929 vtop->c.i = (vtop->c.ll != 0);
1930 else if (dbt != VT_LLONG) {
1931 int s = 0;
1932 if ((dbt & VT_BTYPE) == VT_BYTE)
1933 s = 24;
1934 else if ((dbt & VT_BTYPE) == VT_SHORT)
1935 s = 16;
1936
1937 if(dbt & VT_UNSIGNED)
1938 vtop->c.ui = ((unsigned int)vtop->c.ll << s) >> s;
1939 else
1940 vtop->c.i = ((int)vtop->c.ll << s) >> s;
1941 }
1942 }
1943 } else if (p && dbt == VT_BOOL) {
1944 vtop->r = VT_CONST;
1945 vtop->c.i = 1;
1946 } else if (!nocode_wanted) {
1947 /* non constant case: generate code */
1948 if (sf && df) {
1949 /* convert from fp to fp */
1950 gen_cvt_ftof(dbt);
1951 } else if (df) {
1952 /* convert int to fp */
1953 gen_cvt_itof1(dbt);
1954 } else if (sf) {
1955 /* convert fp to int */
1956 if (dbt == VT_BOOL) {
1957 vpushi(0);
1958 gen_op(TOK_NE);
1959 } else {
1960 /* we handle char/short/etc... with generic code */
1961 if (dbt != (VT_INT | VT_UNSIGNED) &&
1962 dbt != (VT_LLONG | VT_UNSIGNED) &&
1963 dbt != VT_LLONG)
1964 dbt = VT_INT;
1965 gen_cvt_ftoi1(dbt);
1966 if (dbt == VT_INT && (type->t & (VT_BTYPE | VT_UNSIGNED)) != dbt) {
1967 /* additional cast for char/short... */
1968 vtop->type.t = dbt;
1969 gen_cast(type);
1970 }
1971 }
1972 #ifndef TCC_TARGET_X86_64
1973 } else if ((dbt & VT_BTYPE) == VT_LLONG) {
1974 if ((sbt & VT_BTYPE) != VT_LLONG) {
1975 /* scalar to long long */
1976 /* machine independent conversion */
1977 gv(RC_INT);
1978 /* generate high word */
1979 if (sbt == (VT_INT | VT_UNSIGNED)) {
1980 vpushi(0);
1981 gv(RC_INT);
1982 } else {
1983 if (sbt == VT_PTR) {
1984 /* cast from pointer to int before we apply
1985 shift operation, which pointers don't support*/
1986 gen_cast(&int_type);
1987 }
1988 gv_dup();
1989 vpushi(31);
1990 gen_op(TOK_SAR);
1991 }
1992 /* patch second register */
1993 vtop[-1].r2 = vtop->r;
1994 vpop();
1995 }
1996 #else
1997 } else if ((dbt & VT_BTYPE) == VT_LLONG ||
1998 (dbt & VT_BTYPE) == VT_PTR ||
1999 (dbt & VT_BTYPE) == VT_FUNC) {
2000 if ((sbt & VT_BTYPE) != VT_LLONG &&
2001 (sbt & VT_BTYPE) != VT_PTR &&
2002 (sbt & VT_BTYPE) != VT_FUNC) {
2003 /* need to convert from 32bit to 64bit */
2004 int r = gv(RC_INT);
2005 if (sbt != (VT_INT | VT_UNSIGNED)) {
2006 /* x86_64 specific: movslq */
2007 o(0x6348);
2008 o(0xc0 + (REG_VALUE(r) << 3) + REG_VALUE(r));
2009 }
2010 }
2011 #endif
2012 } else if (dbt == VT_BOOL) {
2013 /* scalar to bool */
2014 vpushi(0);
2015 gen_op(TOK_NE);
2016 } else if ((dbt & VT_BTYPE) == VT_BYTE ||
2017 (dbt & VT_BTYPE) == VT_SHORT) {
2018 if (sbt == VT_PTR) {
2019 vtop->type.t = VT_INT;
2020 tcc_warning("nonportable conversion from pointer to char/short");
2021 }
2022 force_charshort_cast(dbt);
2023 } else if ((dbt & VT_BTYPE) == VT_INT) {
2024 /* scalar to int */
2025 if (sbt == VT_LLONG) {
2026 /* from long long: just take low order word */
2027 lexpand();
2028 vpop();
2029 }
2030 /* if lvalue and single word type, nothing to do because
2031 the lvalue already contains the real type size (see
2032 VT_LVAL_xxx constants) */
2033 }
2034 }
2035 } else if ((dbt & VT_BTYPE) == VT_PTR && !(vtop->r & VT_LVAL)) {
2036 /* if we are casting between pointer types,
2037 we must update the VT_LVAL_xxx size */
2038 vtop->r = (vtop->r & ~VT_LVAL_TYPE)
2039 | (lvalue_type(type->ref->type.t) & VT_LVAL_TYPE);
2040 }
2041 vtop->type = *type;
2042 }
2043
2044 /* return type size as known at compile time. Put alignment at 'a' */
2045 ST_FUNC int type_size(CType *type, int *a)
2046 {
2047 Sym *s;
2048 int bt;
2049
2050 bt = type->t & VT_BTYPE;
2051 if (bt == VT_STRUCT) {
2052 /* struct/union */
2053 s = type->ref;
2054 *a = s->r;
2055 return s->c;
2056 } else if (bt == VT_PTR) {
2057 if (type->t & VT_ARRAY) {
2058 int ts;
2059
2060 s = type->ref;
2061 ts = type_size(&s->type, a);
2062
2063 if (ts < 0 && s->c < 0)
2064 ts = -ts;
2065
2066 return ts * s->c;
2067 } else {
2068 *a = PTR_SIZE;
2069 return PTR_SIZE;
2070 }
2071 } else if (bt == VT_LDOUBLE) {
2072 *a = LDOUBLE_ALIGN;
2073 return LDOUBLE_SIZE;
2074 } else if (bt == VT_DOUBLE || bt == VT_LLONG) {
2075 #ifdef TCC_TARGET_I386
2076 #ifdef TCC_TARGET_PE
2077 *a = 8;
2078 #else
2079 *a = 4;
2080 #endif
2081 #elif defined(TCC_TARGET_ARM)
2082 #ifdef TCC_ARM_EABI
2083 *a = 8;
2084 #else
2085 *a = 4;
2086 #endif
2087 #else
2088 *a = 8;
2089 #endif
2090 return 8;
2091 } else if (bt == VT_INT || bt == VT_ENUM || bt == VT_FLOAT) {
2092 *a = 4;
2093 return 4;
2094 } else if (bt == VT_SHORT) {
2095 *a = 2;
2096 return 2;
2097 } else if (bt == VT_QLONG || bt == VT_QFLOAT) {
2098 *a = 8;
2099 return 16;
2100 } else {
2101 /* char, void, function, _Bool */
2102 *a = 1;
2103 return 1;
2104 }
2105 }
2106
2107 /* push type size as known at runtime time on top of value stack. Put
2108 alignment at 'a' */
2109 ST_FUNC void vla_runtime_type_size(CType *type, int *a)
2110 {
2111 if (type->t & VT_VLA) {
2112 vset(&int_type, VT_LOCAL|VT_LVAL, type->ref->c);
2113 } else {
2114 vpushi(type_size(type, a));
2115 }
2116 }
2117
2118 static void vla_sp_save(void) {
2119 if (!(vla_flags & VLA_SP_LOC_SET)) {
2120 *vla_sp_loc = (loc -= PTR_SIZE);
2121 vla_flags |= VLA_SP_LOC_SET;
2122 }
2123 if (!(vla_flags & VLA_SP_SAVED)) {
2124 gen_vla_sp_save(*vla_sp_loc);
2125 vla_flags |= VLA_SP_SAVED;
2126 }
2127 }
2128
2129 /* return the pointed type of t */
2130 static inline CType *pointed_type(CType *type)
2131 {
2132 return &type->ref->type;
2133 }
2134
2135 /* modify type so that its it is a pointer to type. */
2136 ST_FUNC void mk_pointer(CType *type)
2137 {
2138 Sym *s;
2139 s = sym_push(SYM_FIELD, type, 0, -1);
2140 type->t = VT_PTR | (type->t & ~VT_TYPE);
2141 type->ref = s;
2142 }
2143
2144 /* compare function types. OLD functions match any new functions */
2145 static int is_compatible_func(CType *type1, CType *type2)
2146 {
2147 Sym *s1, *s2;
2148
2149 s1 = type1->ref;
2150 s2 = type2->ref;
2151 if (!is_compatible_types(&s1->type, &s2->type))
2152 return 0;
2153 /* check func_call */
2154 if (FUNC_CALL(s1->r) != FUNC_CALL(s2->r))
2155 return 0;
2156 /* XXX: not complete */
2157 if (s1->c == FUNC_OLD || s2->c == FUNC_OLD)
2158 return 1;
2159 if (s1->c != s2->c)
2160 return 0;
2161 while (s1 != NULL) {
2162 if (s2 == NULL)
2163 return 0;
2164 if (!is_compatible_parameter_types(&s1->type, &s2->type))
2165 return 0;
2166 s1 = s1->next;
2167 s2 = s2->next;
2168 }
2169 if (s2)
2170 return 0;
2171 return 1;
2172 }
2173
2174 /* return true if type1 and type2 are the same. If unqualified is
2175 true, qualifiers on the types are ignored.
2176
2177 - enums are not checked as gcc __builtin_types_compatible_p ()
2178 */
2179 static int compare_types(CType *type1, CType *type2, int unqualified)
2180 {
2181 int bt1, t1, t2;
2182
2183 t1 = type1->t & VT_TYPE;
2184 t2 = type2->t & VT_TYPE;
2185 if (unqualified) {
2186 /* strip qualifiers before comparing */
2187 t1 &= ~(VT_CONSTANT | VT_VOLATILE);
2188 t2 &= ~(VT_CONSTANT | VT_VOLATILE);
2189 }
2190 /* XXX: bitfields ? */
2191 if (t1 != t2)
2192 return 0;
2193 /* test more complicated cases */
2194 bt1 = t1 & VT_BTYPE;
2195 if (bt1 == VT_PTR) {
2196 type1 = pointed_type(type1);
2197 type2 = pointed_type(type2);
2198 return is_compatible_types(type1, type2);
2199 } else if (bt1 == VT_STRUCT) {
2200 return (type1->ref == type2->ref);
2201 } else if (bt1 == VT_FUNC) {
2202 return is_compatible_func(type1, type2);
2203 } else {
2204 return 1;
2205 }
2206 }
2207
2208 /* return true if type1 and type2 are exactly the same (including
2209 qualifiers).
2210 */
2211 static int is_compatible_types(CType *type1, CType *type2)
2212 {
2213 return compare_types(type1,type2,0);
2214 }
2215
2216 /* return true if type1 and type2 are the same (ignoring qualifiers).
2217 */
2218 static int is_compatible_parameter_types(CType *type1, CType *type2)
2219 {
2220 return compare_types(type1,type2,1);
2221 }
2222
2223 /* print a type. If 'varstr' is not NULL, then the variable is also
2224 printed in the type */
2225 /* XXX: union */
2226 /* XXX: add array and function pointers */
2227 static void type_to_str(char *buf, int buf_size,
2228 CType *type, const char *varstr)
2229 {
2230 int bt, v, t;
2231 Sym *s, *sa;
2232 char buf1[256];
2233 const char *tstr;
2234
2235 t = type->t & VT_TYPE;
2236 bt = t & VT_BTYPE;
2237 buf[0] = '\0';
2238 if (t & VT_CONSTANT)
2239 pstrcat(buf, buf_size, "const ");
2240 if (t & VT_VOLATILE)
2241 pstrcat(buf, buf_size, "volatile ");
2242 if (t & VT_UNSIGNED)
2243 pstrcat(buf, buf_size, "unsigned ");
2244 switch(bt) {
2245 case VT_VOID:
2246 tstr = "void";
2247 goto add_tstr;
2248 case VT_BOOL:
2249 tstr = "_Bool";
2250 goto add_tstr;
2251 case VT_BYTE:
2252 tstr = "char";
2253 goto add_tstr;
2254 case VT_SHORT:
2255 tstr = "short";
2256 goto add_tstr;
2257 case VT_INT:
2258 tstr = "int";
2259 goto add_tstr;
2260 case VT_LONG:
2261 tstr = "long";
2262 goto add_tstr;
2263 case VT_LLONG:
2264 tstr = "long long";
2265 goto add_tstr;
2266 case VT_FLOAT:
2267 tstr = "float";
2268 goto add_tstr;
2269 case VT_DOUBLE:
2270 tstr = "double";
2271 goto add_tstr;
2272 case VT_LDOUBLE:
2273 tstr = "long double";
2274 add_tstr:
2275 pstrcat(buf, buf_size, tstr);
2276 break;
2277 case VT_ENUM:
2278 case VT_STRUCT:
2279 if (bt == VT_STRUCT)
2280 tstr = "struct ";
2281 else
2282 tstr = "enum ";
2283 pstrcat(buf, buf_size, tstr);
2284 v = type->ref->v & ~SYM_STRUCT;
2285 if (v >= SYM_FIRST_ANOM)
2286 pstrcat(buf, buf_size, "<anonymous>");
2287 else
2288 pstrcat(buf, buf_size, get_tok_str(v, NULL));
2289 break;
2290 case VT_FUNC:
2291 s = type->ref;
2292 type_to_str(buf, buf_size, &s->type, varstr);
2293 pstrcat(buf, buf_size, "(");
2294 sa = s->next;
2295 while (sa != NULL) {
2296 type_to_str(buf1, sizeof(buf1), &sa->type, NULL);
2297 pstrcat(buf, buf_size, buf1);
2298 sa = sa->next;
2299 if (sa)
2300 pstrcat(buf, buf_size, ", ");
2301 }
2302 pstrcat(buf, buf_size, ")");
2303 goto no_var;
2304 case VT_PTR:
2305 s = type->ref;
2306 pstrcpy(buf1, sizeof(buf1), "*");
2307 if (varstr)
2308 pstrcat(buf1, sizeof(buf1), varstr);
2309 type_to_str(buf, buf_size, &s->type, buf1);
2310 goto no_var;
2311 }
2312 if (varstr) {
2313 pstrcat(buf, buf_size, " ");
2314 pstrcat(buf, buf_size, varstr);
2315 }
2316 no_var: ;
2317 }
2318
2319 /* verify type compatibility to store vtop in 'dt' type, and generate
2320 casts if needed. */
2321 static void gen_assign_cast(CType *dt)
2322 {
2323 CType *st, *type1, *type2, tmp_type1, tmp_type2;
2324 char buf1[256], buf2[256];
2325 int dbt, sbt;
2326
2327 st = &vtop->type; /* source type */
2328 dbt = dt->t & VT_BTYPE;
2329 sbt = st->t & VT_BTYPE;
2330 if (sbt == VT_VOID)
2331 tcc_error("Cannot assign void value");
2332 if (dt->t & VT_CONSTANT)
2333 tcc_warning("assignment of read-only location");
2334 switch(dbt) {
2335 case VT_PTR:
2336 /* special cases for pointers */
2337 /* '0' can also be a pointer */
2338 if (is_null_pointer(vtop))
2339 goto type_ok;
2340 /* accept implicit pointer to integer cast with warning */
2341 if (is_integer_btype(sbt)) {
2342 tcc_warning("assignment makes pointer from integer without a cast");
2343 goto type_ok;
2344 }
2345 type1 = pointed_type(dt);
2346 /* a function is implicitely a function pointer */
2347 if (sbt == VT_FUNC) {
2348 if ((type1->t & VT_BTYPE) != VT_VOID &&
2349 !is_compatible_types(pointed_type(dt), st))
2350 tcc_warning("assignment from incompatible pointer type");
2351 goto type_ok;
2352 }
2353 if (sbt != VT_PTR)
2354 goto error;
2355 type2 = pointed_type(st);
2356 if ((type1->t & VT_BTYPE) == VT_VOID ||
2357 (type2->t & VT_BTYPE) == VT_VOID) {
2358 /* void * can match anything */
2359 } else {
2360 /* exact type match, except for unsigned */
2361 tmp_type1 = *type1;
2362 tmp_type2 = *type2;
2363 tmp_type1.t &= ~(VT_UNSIGNED | VT_CONSTANT | VT_VOLATILE);
2364 tmp_type2.t &= ~(VT_UNSIGNED | VT_CONSTANT | VT_VOLATILE);
2365 if (!is_compatible_types(&tmp_type1, &tmp_type2))
2366 tcc_warning("assignment from incompatible pointer type");
2367 }
2368 /* check const and volatile */
2369 if ((!(type1->t & VT_CONSTANT) && (type2->t & VT_CONSTANT)) ||
2370 (!(type1->t & VT_VOLATILE) && (type2->t & VT_VOLATILE)))
2371 tcc_warning("assignment discards qualifiers from pointer target type");
2372 break;
2373 case VT_BYTE:
2374 case VT_SHORT:
2375 case VT_INT:
2376 case VT_LLONG:
2377 if (sbt == VT_PTR || sbt == VT_FUNC) {
2378 tcc_warning("assignment makes integer from pointer without a cast");
2379 }
2380 /* XXX: more tests */
2381 break;
2382 case VT_STRUCT:
2383 tmp_type1 = *dt;
2384 tmp_type2 = *st;
2385 tmp_type1.t &= ~(VT_CONSTANT | VT_VOLATILE);
2386 tmp_type2.t &= ~(VT_CONSTANT | VT_VOLATILE);
2387 if (!is_compatible_types(&tmp_type1, &tmp_type2)) {
2388 error:
2389 type_to_str(buf1, sizeof(buf1), st, NULL);
2390 type_to_str(buf2, sizeof(buf2), dt, NULL);
2391 tcc_error("cannot cast '%s' to '%s'", buf1, buf2);
2392 }
2393 break;
2394 }
2395 type_ok:
2396 gen_cast(dt);
2397 }
2398
2399 /* store vtop in lvalue pushed on stack */
2400 ST_FUNC void vstore(void)
2401 {
2402 int sbt, dbt, ft, r, t, size, align, bit_size, bit_pos, rc, delayed_cast;
2403
2404 ft = vtop[-1].type.t;
2405 sbt = vtop->type.t & VT_BTYPE;
2406 dbt = ft & VT_BTYPE;
2407 if ((((sbt == VT_INT || sbt == VT_SHORT) && dbt == VT_BYTE) ||
2408 (sbt == VT_INT && dbt == VT_SHORT))
2409 && !(vtop->type.t & VT_BITFIELD)) {
2410 /* optimize char/short casts */
2411 delayed_cast = VT_MUSTCAST;
2412 vtop->type.t = ft & (VT_TYPE & ~(VT_BITFIELD | (-1 << VT_STRUCT_SHIFT)));
2413 /* XXX: factorize */
2414 if (ft & VT_CONSTANT)
2415 tcc_warning("assignment of read-only location");
2416 } else {
2417 delayed_cast = 0;
2418 if (!(ft & VT_BITFIELD))
2419 gen_assign_cast(&vtop[-1].type);
2420 }
2421
2422 if (sbt == VT_STRUCT) {
2423 /* if structure, only generate pointer */
2424 /* structure assignment : generate memcpy */
2425 /* XXX: optimize if small size */
2426 if (!nocode_wanted) {
2427 size = type_size(&vtop->type, &align);
2428
2429 /* destination */
2430 vswap();
2431 vtop->type.t = VT_PTR;
2432 gaddrof();
2433
2434 /* address of memcpy() */
2435 #ifdef TCC_ARM_EABI
2436 if(!(align & 7))
2437 vpush_global_sym(&func_old_type, TOK_memcpy8);
2438 else if(!(align & 3))
2439 vpush_global_sym(&func_old_type, TOK_memcpy4);
2440 else
2441 #endif
2442 vpush_global_sym(&func_old_type, TOK_memcpy);
2443
2444 vswap();
2445 /* source */
2446 vpushv(vtop - 2);
2447 vtop->type.t = VT_PTR;
2448 gaddrof();
2449 /* type size */
2450 vpushi(size);
2451 gfunc_call(3);
2452 } else {
2453 vswap();
2454 vpop();
2455 }
2456 /* leave source on stack */
2457 } else if (ft & VT_BITFIELD) {
2458 /* bitfield store handling */
2459 bit_pos = (ft >> VT_STRUCT_SHIFT) & 0x3f;
2460 bit_size = (ft >> (VT_STRUCT_SHIFT + 6)) & 0x3f;
2461 /* remove bit field info to avoid loops */
2462 vtop[-1].type.t = ft & ~(VT_BITFIELD | (-1 << VT_STRUCT_SHIFT));
2463
2464 /* duplicate source into other register */
2465 gv_dup();
2466 vswap();
2467 vrott(3);
2468
2469 if((ft & VT_BTYPE) == VT_BOOL) {
2470 gen_cast(&vtop[-1].type);
2471 vtop[-1].type.t = (vtop[-1].type.t & ~VT_BTYPE) | (VT_BYTE | VT_UNSIGNED);
2472 }
2473
2474 /* duplicate destination */
2475 vdup();
2476 vtop[-1] = vtop[-2];
2477
2478 /* mask and shift source */
2479 if((ft & VT_BTYPE) != VT_BOOL) {
2480 if((ft & VT_BTYPE) == VT_LLONG) {
2481 vpushll((1ULL << bit_size) - 1ULL);
2482 } else {
2483 vpushi((1 << bit_size) - 1);
2484 }
2485 gen_op('&');
2486 }
2487 vpushi(bit_pos);
2488 gen_op(TOK_SHL);
2489 /* load destination, mask and or with source */
2490 vswap();
2491 if((ft & VT_BTYPE) == VT_LLONG) {
2492 vpushll(~(((1ULL << bit_size) - 1ULL) << bit_pos));
2493 } else {
2494 vpushi(~(((1 << bit_size) - 1) << bit_pos));
2495 }
2496 gen_op('&');
2497 gen_op('|');
2498 /* store result */
2499 vstore();
2500
2501 /* pop off shifted source from "duplicate source..." above */
2502 vpop();
2503
2504 } else {
2505 #ifdef CONFIG_TCC_BCHECK
2506 /* bound check case */
2507 if (vtop[-1].r & VT_MUSTBOUND) {
2508 vswap();
2509 gbound();
2510 vswap();
2511 }
2512 #endif
2513 if (!nocode_wanted) {
2514 rc = RC_INT;
2515 if (is_float(ft)) {
2516 rc = RC_FLOAT;
2517 #ifdef TCC_TARGET_X86_64
2518 if ((ft & VT_BTYPE) == VT_LDOUBLE) {
2519 rc = RC_ST0;
2520 } else if ((ft & VT_BTYPE) == VT_QFLOAT) {
2521 rc = RC_FRET;
2522 }
2523 #endif
2524 }
2525 r = gv(rc); /* generate value */
2526 /* if lvalue was saved on stack, must read it */
2527 if ((vtop[-1].r & VT_VALMASK) == VT_LLOCAL) {
2528 SValue sv;
2529 t = get_reg(RC_INT);
2530 #ifdef TCC_TARGET_X86_64
2531 sv.type.t = VT_PTR;
2532 #else
2533 sv.type.t = VT_INT;
2534 #endif
2535 sv.r = VT_LOCAL | VT_LVAL;
2536 sv.c.ul = vtop[-1].c.ul;
2537 load(t, &sv);
2538 vtop[-1].r = t | VT_LVAL;
2539 }
2540 /* two word case handling : store second register at word + 4 (or +8 for x86-64) */
2541 #ifdef TCC_TARGET_X86_64
2542 if (((ft & VT_BTYPE) == VT_QLONG) || ((ft & VT_BTYPE) == VT_QFLOAT)) {
2543 int addr_type = VT_LLONG, load_size = 8, load_type = ((vtop->type.t & VT_BTYPE) == VT_QLONG) ? VT_LLONG : VT_DOUBLE;
2544 #else
2545 if ((ft & VT_BTYPE) == VT_LLONG) {
2546 int addr_type = VT_INT, load_size = 4, load_type = VT_INT;
2547 #endif
2548 vtop[-1].type.t = load_type;
2549 store(r, vtop - 1);
2550 vswap();
2551 /* convert to int to increment easily */
2552 vtop->type.t = addr_type;
2553 gaddrof();
2554 vpushi(load_size);
2555 gen_op('+');
2556 vtop->r |= VT_LVAL;
2557 vswap();
2558 vtop[-1].type.t = load_type;
2559 /* XXX: it works because r2 is spilled last ! */
2560 store(vtop->r2, vtop - 1);
2561 } else {
2562 store(r, vtop - 1);
2563 }
2564 }
2565 vswap();
2566 vtop--; /* NOT vpop() because on x86 it would flush the fp stack */
2567 vtop->r |= delayed_cast;
2568 }
2569 }
2570
2571 /* post defines POST/PRE add. c is the token ++ or -- */
2572 ST_FUNC void inc(int post, int c)
2573 {
2574 test_lvalue();
2575 vdup(); /* save lvalue */
2576 if (post) {
2577 gv_dup(); /* duplicate value */
2578 vrotb(3);
2579 vrotb(3);
2580 }
2581 /* add constant */
2582 vpushi(c - TOK_MID);
2583 gen_op('+');
2584 vstore(); /* store value */
2585 if (post)
2586 vpop(); /* if post op, return saved value */
2587 }
2588
2589 /* Parse GNUC __attribute__ extension. Currently, the following
2590 extensions are recognized:
2591 - aligned(n) : set data/function alignment.
2592 - packed : force data alignment to 1
2593 - section(x) : generate data/code in this section.
2594 - unused : currently ignored, but may be used someday.
2595 - regparm(n) : pass function parameters in registers (i386 only)
2596 */
2597 static void parse_attribute(AttributeDef *ad)
2598 {
2599 int t, n;
2600
2601 while (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2) {
2602 next();
2603 skip('(');
2604 skip('(');
2605 while (tok != ')') {
2606 if (tok < TOK_IDENT)
2607 expect("attribute name");
2608 t = tok;
2609 next();
2610 switch(t) {
2611 case TOK_SECTION1:
2612 case TOK_SECTION2:
2613 skip('(');
2614 if (tok != TOK_STR)
2615 expect("section name");
2616 ad->section = find_section(tcc_state, (char *)tokc.cstr->data);
2617 next();
2618 skip(')');
2619 break;
2620 case TOK_ALIAS1:
2621 case TOK_ALIAS2:
2622 skip('(');
2623 if (tok != TOK_STR)
2624 expect("alias(\"target\")");
2625 ad->alias_target = /* save string as token, for later */
2626 tok_alloc((char*)tokc.cstr->data, tokc.cstr->size-1)->tok;
2627 next();
2628 skip(')');
2629 break;
2630 case TOK_ALIGNED1:
2631 case TOK_ALIGNED2:
2632 if (tok == '(') {
2633 next();
2634 n = expr_const();
2635 if (n <= 0 || (n & (n - 1)) != 0)
2636 tcc_error("alignment must be a positive power of two");
2637 skip(')');
2638 } else {
2639 n = MAX_ALIGN;
2640 }
2641 ad->aligned = n;
2642 break;
2643 case TOK_PACKED1:
2644 case TOK_PACKED2:
2645 ad->packed = 1;
2646 break;
2647 case TOK_WEAK1:
2648 case TOK_WEAK2:
2649 ad->weak = 1;
2650 break;
2651 case TOK_UNUSED1:
2652 case TOK_UNUSED2:
2653 /* currently, no need to handle it because tcc does not
2654 track unused objects */
2655 break;
2656 case TOK_NORETURN1:
2657 case TOK_NORETURN2:
2658 /* currently, no need to handle it because tcc does not
2659 track unused objects */
2660 break;
2661 case TOK_CDECL1:
2662 case TOK_CDECL2:
2663 case TOK_CDECL3:
2664 ad->func_call = FUNC_CDECL;
2665 break;
2666 case TOK_STDCALL1:
2667 case TOK_STDCALL2:
2668 case TOK_STDCALL3:
2669 ad->func_call = FUNC_STDCALL;
2670 break;
2671 #ifdef TCC_TARGET_I386
2672 case TOK_REGPARM1:
2673 case TOK_REGPARM2:
2674 skip('(');
2675 n = expr_const();
2676 if (n > 3)
2677 n = 3;
2678 else if (n < 0)
2679 n = 0;
2680 if (n > 0)
2681 ad->func_call = FUNC_FASTCALL1 + n - 1;
2682 skip(')');
2683 break;
2684 case TOK_FASTCALL1:
2685 case TOK_FASTCALL2:
2686 case TOK_FASTCALL3:
2687 ad->func_call = FUNC_FASTCALLW;
2688 break;
2689 #endif
2690 case TOK_MODE:
2691 skip('(');
2692 switch(tok) {
2693 case TOK_MODE_DI:
2694 ad->mode = VT_LLONG + 1;
2695 break;
2696 case TOK_MODE_HI:
2697 ad->mode = VT_SHORT + 1;
2698 break;
2699 case TOK_MODE_SI:
2700 ad->mode = VT_INT + 1;
2701 break;
2702 default:
2703 tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok, NULL));
2704 break;
2705 }
2706 next();
2707 skip(')');
2708 break;
2709 case TOK_DLLEXPORT:
2710 ad->func_export = 1;
2711 break;
2712 case TOK_DLLIMPORT:
2713 ad->func_import = 1;
2714 break;
2715 default:
2716 if (tcc_state->warn_unsupported)
2717 tcc_warning("'%s' attribute ignored", get_tok_str(t, NULL));
2718 /* skip parameters */
2719 if (tok == '(') {
2720 int parenthesis = 0;
2721 do {
2722 if (tok == '(')
2723 parenthesis++;
2724 else if (tok == ')')
2725 parenthesis--;
2726 next();
2727 } while (parenthesis && tok != -1);
2728 }
2729 break;
2730 }
2731 if (tok != ',')
2732 break;
2733 next();
2734 }
2735 skip(')');
2736 skip(')');
2737 }
2738 }
2739
2740 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
2741 static void struct_decl(CType *type, int u)
2742 {
2743 int a, v, size, align, maxalign, c, offset;
2744 int bit_size, bit_pos, bsize, bt, lbit_pos, prevbt;
2745 Sym *s, *ss, *ass, **ps;
2746 AttributeDef ad;
2747 CType type1, btype;
2748
2749 a = tok; /* save decl type */
2750 next();
2751 if (tok != '{') {
2752 v = tok;
2753 next();
2754 /* struct already defined ? return it */
2755 if (v < TOK_IDENT)
2756 expect("struct/union/enum name");
2757 s = struct_find(v);
2758 if (s) {
2759 if (s->type.t != a)
2760 tcc_error("invalid type");
2761 goto do_decl;
2762 }
2763 } else {
2764 v = anon_sym++;
2765 }
2766 type1.t = a;
2767 type1.ref = NULL;
2768 /* we put an undefined size for struct/union */
2769 s = sym_push(v | SYM_STRUCT, &type1, 0, -1);
2770 s->r = 0; /* default alignment is zero as gcc */
2771 /* put struct/union/enum name in type */
2772 do_decl:
2773 type->t = u;
2774 type->ref = s;
2775
2776 if (tok == '{') {
2777 next();
2778 if (s->c != -1)
2779 tcc_error("struct/union/enum already defined");
2780 /* cannot be empty */
2781 c = 0;
2782 /* non empty enums are not allowed */
2783 if (a == TOK_ENUM) {
2784 for(;;) {
2785 v = tok;
2786 if (v < TOK_UIDENT)
2787 expect("identifier");
2788 next();
2789 if (tok == '=') {
2790 next();
2791 c = expr_const();
2792 }
2793 /* enum symbols have static storage */
2794 ss = sym_push(v, &int_type, VT_CONST, c);
2795 ss->type.t |= VT_STATIC;
2796 if (tok != ',')
2797 break;
2798 next();
2799 c++;
2800 /* NOTE: we accept a trailing comma */
2801 if (tok == '}')
2802 break;
2803 }
2804 s->c = type_size(&int_type, &align);
2805 skip('}');
2806 } else {
2807 maxalign = 1;
2808 ps = &s->next;
2809 prevbt = VT_INT;
2810 bit_pos = 0;
2811 offset = 0;
2812 while (tok != '}') {
2813 parse_btype(&btype, &ad);
2814 while (1) {
2815 bit_size = -1;
2816 v = 0;
2817 type1 = btype;
2818 if (tok != ':') {
2819 type_decl(&type1, &ad, &v, TYPE_DIRECT | TYPE_ABSTRACT);
2820 if (v == 0 && (type1.t & VT_BTYPE) != VT_STRUCT)
2821 expect("identifier");
2822 if ((type1.t & VT_BTYPE) == VT_FUNC ||
2823 (type1.t & (VT_TYPEDEF | VT_STATIC | VT_EXTERN | VT_INLINE)))
2824 tcc_error("invalid type for '%s'",
2825 get_tok_str(v, NULL));
2826 }
2827 if (tok == ':') {
2828 next();
2829 bit_size = expr_const();
2830 /* XXX: handle v = 0 case for messages */
2831 if (bit_size < 0)
2832 tcc_error("negative width in bit-field '%s'",
2833 get_tok_str(v, NULL));
2834 if (v && bit_size == 0)
2835 tcc_error("zero width for bit-field '%s'",
2836 get_tok_str(v, NULL));
2837 }
2838 size = type_size(&type1, &align);
2839 if (ad.aligned) {
2840 if (align < ad.aligned)
2841 align = ad.aligned;
2842 } else if (ad.packed) {
2843 align = 1;
2844 } else if (*tcc_state->pack_stack_ptr) {
2845 if (align > *tcc_state->pack_stack_ptr)
2846 align = *tcc_state->pack_stack_ptr;
2847 }
2848 lbit_pos = 0;
2849 if (bit_size >= 0) {
2850 bt = type1.t & VT_BTYPE;
2851 if (bt != VT_INT &&
2852 bt != VT_BYTE &&
2853 bt != VT_SHORT &&
2854 bt != VT_BOOL &&
2855 bt != VT_ENUM &&
2856 bt != VT_LLONG)
2857 tcc_error("bitfields must have scalar type");
2858 bsize = size * 8;
2859 if (bit_size > bsize) {
2860 tcc_error("width of '%s' exceeds its type",
2861 get_tok_str(v, NULL));
2862 } else if (bit_size == bsize) {
2863 /* no need for bit fields */
2864 bit_pos = 0;
2865 } else if (bit_size == 0) {
2866 /* XXX: what to do if only padding in a
2867 structure ? */
2868 /* zero size: means to pad */
2869 bit_pos = 0;
2870 } else {
2871 /* we do not have enough room ?
2872 did the type change?
2873 is it a union? */
2874 if ((bit_pos + bit_size) > bsize ||
2875 bt != prevbt || a == TOK_UNION)
2876 bit_pos = 0;
2877 lbit_pos = bit_pos;
2878 /* XXX: handle LSB first */
2879 type1.t |= VT_BITFIELD |
2880 (bit_pos << VT_STRUCT_SHIFT) |
2881 (bit_size << (VT_STRUCT_SHIFT + 6));
2882 bit_pos += bit_size;
2883 }
2884 prevbt = bt;
2885 } else {
2886 bit_pos = 0;
2887 }
2888 if (v != 0 || (type1.t & VT_BTYPE) == VT_STRUCT) {
2889 /* add new memory data only if starting
2890 bit field */
2891 if (lbit_pos == 0) {
2892 if (a == TOK_STRUCT) {
2893 c = (c + align - 1) & -align;
2894 offset = c;
2895 if (size > 0)
2896 c += size;
2897 } else {
2898 offset = 0;
2899 if (size > c)
2900 c = size;
2901 }
2902 if (align > maxalign)
2903 maxalign = align;
2904 }
2905 #if 0
2906 printf("add field %s offset=%d",
2907 get_tok_str(v, NULL), offset);
2908 if (type1.t & VT_BITFIELD) {
2909 printf(" pos=%d size=%d",
2910 (type1.t >> VT_STRUCT_SHIFT) & 0x3f,
2911 (type1.t >> (VT_STRUCT_SHIFT + 6)) & 0x3f);
2912 }
2913 printf("\n");
2914 #endif
2915 }
2916 if (v == 0 && (type1.t & VT_BTYPE) == VT_STRUCT) {
2917 ass = type1.ref;
2918 while ((ass = ass->next) != NULL) {
2919 ss = sym_push(ass->v, &ass->type, 0, offset + ass->c);
2920 *ps = ss;
2921 ps = &ss->next;
2922 }
2923 } else if (v) {
2924 ss = sym_push(v | SYM_FIELD, &type1, 0, offset);
2925 *ps = ss;
2926 ps = &ss->next;
2927 }
2928 if (tok == ';' || tok == TOK_EOF)
2929 break;
2930 skip(',');
2931 }
2932 skip(';');
2933 }
2934 skip('}');
2935 /* store size and alignment */
2936 s->c = (c + maxalign - 1) & -maxalign;
2937 s->r = maxalign;
2938 }
2939 }
2940 }
2941
2942 /* return 0 if no type declaration. otherwise, return the basic type
2943 and skip it.
2944 */
2945 static int parse_btype(CType *type, AttributeDef *ad)
2946 {
2947 int t, u, type_found, typespec_found, typedef_found;
2948 Sym *s;
2949 CType type1;
2950
2951 memset(ad, 0, sizeof(AttributeDef));
2952 type_found = 0;
2953 typespec_found = 0;
2954 typedef_found = 0;
2955 t = 0;
2956 while(1) {
2957 switch(tok) {
2958 case TOK_EXTENSION:
2959 /* currently, we really ignore extension */
2960 next();
2961 continue;
2962
2963 /* basic types */
2964 case TOK_CHAR:
2965 u = VT_BYTE;
2966 basic_type:
2967 next();
2968 basic_type1:
2969 if ((t & VT_BTYPE) != 0)
2970 tcc_error("too many basic types");
2971 t |= u;
2972 typespec_found = 1;
2973 break;
2974 case TOK_VOID:
2975 u = VT_VOID;
2976 goto basic_type;
2977 case TOK_SHORT:
2978 u = VT_SHORT;
2979 goto basic_type;
2980 case TOK_INT:
2981 next();
2982 typespec_found = 1;
2983 break;
2984 case TOK_LONG:
2985 next();
2986 if ((t & VT_BTYPE) == VT_DOUBLE) {
2987 #ifndef TCC_TARGET_PE
2988 t = (t & ~VT_BTYPE) | VT_LDOUBLE;
2989 #endif
2990 } else if ((t & VT_BTYPE) == VT_LONG) {
2991 t = (t & ~VT_BTYPE) | VT_LLONG;
2992 } else {
2993 u = VT_LONG;
2994 goto basic_type1;
2995 }
2996 break;
2997 case TOK_BOOL:
2998 u = VT_BOOL;
2999 goto basic_type;
3000 case TOK_FLOAT:
3001 u = VT_FLOAT;
3002 goto basic_type;
3003 case TOK_DOUBLE:
3004 next();
3005 if ((t & VT_BTYPE) == VT_LONG) {
3006 #ifdef TCC_TARGET_PE
3007 t = (t & ~VT_BTYPE) | VT_DOUBLE;
3008 #else
3009 t = (t & ~VT_BTYPE) | VT_LDOUBLE;
3010 #endif
3011 } else {
3012 u = VT_DOUBLE;
3013 goto basic_type1;
3014 }
3015 break;
3016 case TOK_ENUM:
3017 struct_decl(&type1, VT_ENUM);
3018 basic_type2:
3019 u = type1.t;
3020 type->ref = type1.ref;
3021 goto basic_type1;
3022 case TOK_STRUCT:
3023 case TOK_UNION:
3024 struct_decl(&type1, VT_STRUCT);
3025 goto basic_type2;
3026
3027 /* type modifiers */
3028 case TOK_CONST1:
3029 case TOK_CONST2:
3030 case TOK_CONST3:
3031 t |= VT_CONSTANT;
3032 next();
3033 break;
3034 case TOK_VOLATILE1:
3035 case TOK_VOLATILE2:
3036 case TOK_VOLATILE3:
3037 t |= VT_VOLATILE;
3038 next();
3039 break;
3040 case TOK_SIGNED1:
3041 case TOK_SIGNED2:
3042 case TOK_SIGNED3:
3043 typespec_found = 1;
3044 t |= VT_SIGNED;
3045 next();
3046 break;
3047 case TOK_REGISTER:
3048 case TOK_AUTO:
3049 case TOK_RESTRICT1:
3050 case TOK_RESTRICT2:
3051 case TOK_RESTRICT3:
3052 next();
3053 break;
3054 case TOK_UNSIGNED:
3055 t |= VT_UNSIGNED;
3056 next();
3057 typespec_found = 1;
3058 break;
3059
3060 /* storage */
3061 case TOK_EXTERN:
3062 t |= VT_EXTERN;
3063 next();
3064 break;
3065 case TOK_STATIC:
3066 t |= VT_STATIC;
3067 next();
3068 break;
3069 case TOK_TYPEDEF:
3070 t |= VT_TYPEDEF;
3071 next();
3072 break;
3073 case TOK_INLINE1:
3074 case TOK_INLINE2:
3075 case TOK_INLINE3:
3076 t |= VT_INLINE;
3077 next();
3078 break;
3079
3080 /* GNUC attribute */
3081 case TOK_ATTRIBUTE1:
3082 case TOK_ATTRIBUTE2:
3083 parse_attribute(ad);
3084 if (ad->mode) {
3085 u = ad->mode -1;
3086 t = (t & ~VT_BTYPE) | u;
3087 }
3088 break;
3089 /* GNUC typeof */
3090 case TOK_TYPEOF1:
3091 case TOK_TYPEOF2:
3092 case TOK_TYPEOF3:
3093 next();
3094 parse_expr_type(&type1);
3095 /* remove all storage modifiers except typedef */
3096 type1.t &= ~(VT_STORAGE&~VT_TYPEDEF);
3097 goto basic_type2;
3098 default:
3099 if (typespec_found || typedef_found)
3100 goto the_end;
3101 s = sym_find(tok);
3102 if (!s || !(s->type.t & VT_TYPEDEF))
3103 goto the_end;
3104 typedef_found = 1;
3105 t |= (s->type.t & ~VT_TYPEDEF);
3106 type->ref = s->type.ref;
3107 if (s->r) {
3108 /* get attributes from typedef */
3109 if (0 == ad->aligned)
3110 ad->aligned = FUNC_ALIGN(s->r);
3111 if (0 == ad->func_call)
3112 ad->func_call = FUNC_CALL(s->r);
3113 ad->packed |= FUNC_PACKED(s->r);
3114 }
3115 next();
3116 typespec_found = 1;
3117 break;
3118 }
3119 type_found = 1;
3120 }
3121 the_end:
3122 if ((t & (VT_SIGNED|VT_UNSIGNED)) == (VT_SIGNED|VT_UNSIGNED))
3123 tcc_error("signed and unsigned modifier");
3124 if (tcc_state->char_is_unsigned) {
3125 if ((t & (VT_SIGNED|VT_UNSIGNED|VT_BTYPE)) == VT_BYTE)
3126 t |= VT_UNSIGNED;
3127 }
3128 t &= ~VT_SIGNED;
3129
3130 /* long is never used as type */
3131 if ((t & VT_BTYPE) == VT_LONG)
3132 #if !defined TCC_TARGET_X86_64 || defined TCC_TARGET_PE
3133 t = (t & ~VT_BTYPE) | VT_INT;
3134 #else
3135 t = (t & ~VT_BTYPE) | VT_LLONG;
3136 #endif
3137 type->t = t;
3138 return type_found;
3139 }
3140
3141 /* convert a function parameter type (array to pointer and function to
3142 function pointer) */
3143 static inline void convert_parameter_type(CType *pt)
3144 {
3145 /* remove const and volatile qualifiers (XXX: const could be used
3146 to indicate a const function parameter */
3147 pt->t &= ~(VT_CONSTANT | VT_VOLATILE);
3148 /* array must be transformed to pointer according to ANSI C */
3149 pt->t &= ~VT_ARRAY;
3150 if ((pt->t & VT_BTYPE) == VT_FUNC) {
3151 mk_pointer(pt);
3152 }
3153 }
3154
3155 ST_FUNC void parse_asm_str(CString *astr)
3156 {
3157 skip('(');
3158 /* read the string */
3159 if (tok != TOK_STR)
3160 expect("string constant");
3161 cstr_new(astr);
3162 while (tok == TOK_STR) {
3163 /* XXX: add \0 handling too ? */
3164 cstr_cat(astr, tokc.cstr->data);
3165 next();
3166 }
3167 cstr_ccat(astr, '\0');
3168 }
3169
3170 /* Parse an asm label and return the label
3171 * Don't forget to free the CString in the caller! */
3172 static void asm_label_instr(CString *astr)
3173 {
3174 next();
3175 parse_asm_str(astr);
3176 skip(')');
3177 #ifdef ASM_DEBUG
3178 printf("asm_alias: \"%s\"\n", (char *)astr->data);
3179 #endif
3180 }
3181
3182 static void post_type(CType *type, AttributeDef *ad)
3183 {
3184 int n, l, t1, arg_size, align;
3185 Sym **plast, *s, *first;
3186 AttributeDef ad1;
3187 CType pt;
3188
3189 if (tok == '(') {
3190 /* function declaration */
3191 next();
3192 l = 0;
3193 first = NULL;
3194 plast = &first;
3195 arg_size = 0;
3196 if (tok != ')') {
3197 for(;;) {
3198 /* read param name and compute offset */
3199 if (l != FUNC_OLD) {
3200 if (!parse_btype(&pt, &ad1)) {
3201 if (l) {
3202 tcc_error("invalid type");
3203 } else {
3204 l = FUNC_OLD;
3205 goto old_proto;
3206 }
3207 }
3208 l = FUNC_NEW;
3209 if ((pt.t & VT_BTYPE) == VT_VOID && tok == ')')
3210 break;
3211 type_decl(&pt, &ad1, &n, TYPE_DIRECT | TYPE_ABSTRACT);
3212 if ((pt.t & VT_BTYPE) == VT_VOID)
3213 tcc_error("parameter declared as void");
3214 arg_size += (type_size(&pt, &align) + PTR_SIZE - 1) / PTR_SIZE;
3215 } else {
3216 old_proto:
3217 n = tok;
3218 if (n < TOK_UIDENT)
3219 expect("identifier");
3220 pt.t = VT_INT;
3221 next();
3222 }
3223 convert_parameter_type(&pt);
3224 s = sym_push(n | SYM_FIELD, &pt, 0, 0);
3225 *plast = s;
3226 plast = &s->next;
3227 if (tok == ')')
3228 break;
3229 skip(',');
3230 if (l == FUNC_NEW && tok == TOK_DOTS) {
3231 l = FUNC_ELLIPSIS;
3232 next();
3233 break;
3234 }
3235 }
3236 }
3237 /* if no parameters, then old type prototype */
3238 if (l == 0)
3239 l = FUNC_OLD;
3240 skip(')');
3241 /* NOTE: const is ignored in returned type as it has a special
3242 meaning in gcc / C++ */
3243 type->t &= ~VT_CONSTANT;
3244 /* some ancient pre-K&R C allows a function to return an array
3245 and the array brackets to be put after the arguments, such
3246 that "int c()[]" means something like "int[] c()" */
3247 if (tok == '[') {
3248 next();
3249 skip(']'); /* only handle simple "[]" */
3250 type->t |= VT_PTR;
3251 }
3252 /* we push a anonymous symbol which will contain the function prototype */
3253 ad->func_args = arg_size;
3254 s = sym_push(SYM_FIELD, type, INT_ATTR(ad), l);
3255 s->next = first;
3256 type->t = VT_FUNC;
3257 type->ref = s;
3258 } else if (tok == '[') {
3259 /* array definition */
3260 next();
3261 if (tok == TOK_RESTRICT1)
3262 next();
3263 n = -1;
3264 t1 = 0;
3265 if (tok != ']') {
3266 if (!local_stack || nocode_wanted)
3267 vpushi(expr_const());
3268 else gexpr();
3269 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
3270 n = vtop->c.i;
3271 if (n < 0)
3272 tcc_error("invalid array size");
3273 } else {
3274 if (!is_integer_btype(vtop->type.t & VT_BTYPE))
3275 tcc_error("size of variable length array should be an integer");
3276 t1 = VT_VLA;
3277 }
3278 }
3279 skip(']');
3280 /* parse next post type */
3281 post_type(type, ad);
3282 if (type->t == VT_FUNC)
3283 tcc_error("declaration of an array of functions");
3284 t1 |= type->t & VT_VLA;
3285
3286 if (t1 & VT_VLA) {
3287 loc -= type_size(&int_type, &align);
3288 loc &= -align;
3289 n = loc;
3290
3291 vla_runtime_type_size(type, &align);
3292 gen_op('*');
3293 vset(&int_type, VT_LOCAL|VT_LVAL, loc);
3294 vswap();
3295 vstore();
3296 }
3297 if (n != -1)
3298 vpop();
3299
3300 /* we push an anonymous symbol which will contain the array
3301 element type */
3302 s = sym_push(SYM_FIELD, type, 0, n);
3303 type->t = (t1 ? VT_VLA : VT_ARRAY) | VT_PTR;
3304 type->ref = s;
3305 }
3306 }
3307
3308 /* Parse a type declaration (except basic type), and return the type
3309 in 'type'. 'td' is a bitmask indicating which kind of type decl is
3310 expected. 'type' should contain the basic type. 'ad' is the
3311 attribute definition of the basic type. It can be modified by
3312 type_decl().
3313 */
3314 static void type_decl(CType *type, AttributeDef *ad, int *v, int td)
3315 {
3316 Sym *s;
3317 CType type1, *type2;
3318 int qualifiers, storage;
3319
3320 while (tok == '*') {
3321 qualifiers = 0;
3322 redo:
3323 next();
3324 switch(tok) {
3325 case TOK_CONST1:
3326 case TOK_CONST2:
3327 case TOK_CONST3:
3328 qualifiers |= VT_CONSTANT;
3329 goto redo;
3330 case TOK_VOLATILE1:
3331 case TOK_VOLATILE2:
3332 case TOK_VOLATILE3:
3333 qualifiers |= VT_VOLATILE;
3334 goto redo;
3335 case TOK_RESTRICT1:
3336 case TOK_RESTRICT2:
3337 case TOK_RESTRICT3:
3338 goto redo;
3339 }
3340 mk_pointer(type);
3341 type->t |= qualifiers;
3342 }
3343
3344 /* XXX: clarify attribute handling */
3345 if (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2)
3346 parse_attribute(ad);
3347
3348 /* recursive type */
3349 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
3350 type1.t = 0; /* XXX: same as int */
3351 if (tok == '(') {
3352 next();
3353 /* XXX: this is not correct to modify 'ad' at this point, but
3354 the syntax is not clear */
3355 if (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2)
3356 parse_attribute(ad);
3357 type_decl(&type1, ad, v, td);
3358 skip(')');
3359 } else {
3360 /* type identifier */
3361 if (tok >= TOK_IDENT && (td & TYPE_DIRECT)) {
3362 *v = tok;
3363 next();
3364 } else {
3365 if (!(td & TYPE_ABSTRACT))
3366 expect("identifier");
3367 *v = 0;
3368 }
3369 }
3370 storage = type->t & VT_STORAGE;
3371 type->t &= ~VT_STORAGE;
3372 if (storage & VT_STATIC) {
3373 int saved_nocode_wanted = nocode_wanted;
3374 nocode_wanted = 1;
3375 post_type(type, ad);
3376 nocode_wanted = saved_nocode_wanted;
3377 } else
3378 post_type(type, ad);
3379 type->t |= storage;
3380 if (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2)
3381 parse_attribute(ad);
3382
3383 if (!type1.t)
3384 return;
3385 /* append type at the end of type1 */
3386 type2 = &type1;
3387 for(;;) {
3388 s = type2->ref;
3389 type2 = &s->type;
3390 if (!type2->t) {
3391 *type2 = *type;
3392 break;
3393 }
3394 }
3395 *type = type1;
3396 }
3397
3398 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
3399 ST_FUNC int lvalue_type(int t)
3400 {
3401 int bt, r;
3402 r = VT_LVAL;
3403 bt = t & VT_BTYPE;
3404 if (bt == VT_BYTE || bt == VT_BOOL)
3405 r |= VT_LVAL_BYTE;
3406 else if (bt == VT_SHORT)
3407 r |= VT_LVAL_SHORT;
3408 else
3409 return r;
3410 if (t & VT_UNSIGNED)
3411 r |= VT_LVAL_UNSIGNED;
3412 return r;
3413 }
3414
3415 /* indirection with full error checking and bound check */
3416 ST_FUNC void indir(void)
3417 {
3418 if ((vtop->type.t & VT_BTYPE) != VT_PTR) {
3419 if ((vtop->type.t & VT_BTYPE) == VT_FUNC)
3420 return;
3421 expect("pointer");
3422 }
3423 if ((vtop->r & VT_LVAL) && !nocode_wanted)
3424 gv(RC_INT);
3425 vtop->type = *pointed_type(&vtop->type);
3426 /* Arrays and functions are never lvalues */
3427 if (!(vtop->type.t & VT_ARRAY) && !(vtop->type.t & VT_VLA)
3428 && (vtop->type.t & VT_BTYPE) != VT_FUNC) {
3429 vtop->r |= lvalue_type(vtop->type.t);
3430 /* if bound checking, the referenced pointer must be checked */
3431 #ifdef CONFIG_TCC_BCHECK
3432 if (tcc_state->do_bounds_check)
3433 vtop->r |= VT_MUSTBOUND;
3434 #endif
3435 }
3436 }
3437
3438 /* pass a parameter to a function and do type checking and casting */
3439 static void gfunc_param_typed(Sym *func, Sym *arg)
3440 {
3441 int func_type;
3442 CType type;
3443
3444 func_type = func->c;
3445 if (func_type == FUNC_OLD ||
3446 (func_type == FUNC_ELLIPSIS && arg == NULL)) {
3447 /* default casting : only need to convert float to double */
3448 if ((vtop->type.t & VT_BTYPE) == VT_FLOAT) {
3449 type.t = VT_DOUBLE;
3450 gen_cast(&type);
3451 }
3452 } else if (arg == NULL) {
3453 tcc_error("too many arguments to function");
3454 } else {
3455 type = arg->type;
3456 type.t &= ~VT_CONSTANT; /* need to do that to avoid false warning */
3457 gen_assign_cast(&type);
3458 }
3459 }
3460
3461 /* parse an expression of the form '(type)' or '(expr)' and return its
3462 type */
3463 static void parse_expr_type(CType *type)
3464 {
3465 int n;
3466 AttributeDef ad;
3467
3468 skip('(');
3469 if (parse_btype(type, &ad)) {
3470 type_decl(type, &ad, &n, TYPE_ABSTRACT);
3471 } else {
3472 expr_type(type);
3473 }
3474 skip(')');
3475 }
3476
3477 static void parse_type(CType *type)
3478 {
3479 AttributeDef ad;
3480 int n;
3481
3482 if (!parse_btype(type, &ad)) {
3483 expect("type");
3484 }
3485 type_decl(type, &ad, &n, TYPE_ABSTRACT);
3486 }
3487
3488 static void vpush_tokc(int t)
3489 {
3490 CType type;
3491 type.t = t;
3492 type.ref = 0;
3493 vsetc(&type, VT_CONST, &tokc);
3494 }
3495
3496 ST_FUNC void unary(void)
3497 {
3498 int n, t, align, size, r, sizeof_caller;
3499 CType type;
3500 Sym *s;
3501 AttributeDef ad;
3502 static int in_sizeof = 0;
3503
3504 sizeof_caller = in_sizeof;
3505 in_sizeof = 0;
3506 /* XXX: GCC 2.95.3 does not generate a table although it should be
3507 better here */
3508 tok_next:
3509 switch(tok) {
3510 case TOK_EXTENSION:
3511 next();
3512 goto tok_next;
3513 case TOK_CINT:
3514 case TOK_CCHAR:
3515 case TOK_LCHAR:
3516 vpushi(tokc.i);
3517 next();
3518 break;
3519 case TOK_CUINT:
3520 vpush_tokc(VT_INT | VT_UNSIGNED);
3521 next();
3522 break;
3523 case TOK_CLLONG:
3524 vpush_tokc(VT_LLONG);
3525 next();
3526 break;
3527 case TOK_CULLONG:
3528 vpush_tokc(VT_LLONG | VT_UNSIGNED);
3529 next();
3530 break;
3531 case TOK_CFLOAT:
3532 vpush_tokc(VT_FLOAT);
3533 next();
3534 break;
3535 case TOK_CDOUBLE:
3536 vpush_tokc(VT_DOUBLE);
3537 next();
3538 break;
3539 case TOK_CLDOUBLE:
3540 vpush_tokc(VT_LDOUBLE);
3541 next();
3542 break;
3543 case TOK___FUNCTION__:
3544 if (!gnu_ext)
3545 goto tok_identifier;
3546 /* fall thru */
3547 case TOK___FUNC__:
3548 {
3549 void *ptr;
3550 int len;
3551 /* special function name identifier */
3552 len = strlen(funcname) + 1;
3553 /* generate char[len] type */
3554 type.t = VT_BYTE;
3555 mk_pointer(&type);
3556 type.t |= VT_ARRAY;
3557 type.ref->c = len;
3558 vpush_ref(&type, data_section, data_section->data_offset, len);
3559 ptr = section_ptr_add(data_section, len);
3560 memcpy(ptr, funcname, len);
3561 next();
3562 }
3563 break;
3564 case TOK_LSTR:
3565 #ifdef TCC_TARGET_PE
3566 t = VT_SHORT | VT_UNSIGNED;
3567 #else
3568 t = VT_INT;
3569 #endif
3570 goto str_init;
3571 case TOK_STR:
3572 /* string parsing */
3573 t = VT_BYTE;
3574 str_init:
3575 if (tcc_state->warn_write_strings)
3576 t |= VT_CONSTANT;
3577 type.t = t;
3578 mk_pointer(&type);
3579 type.t |= VT_ARRAY;
3580 memset(&ad, 0, sizeof(AttributeDef));
3581 decl_initializer_alloc(&type, &ad, VT_CONST, 2, 0, NULL, 0);
3582 break;
3583 case '(':
3584 next();
3585 /* cast ? */
3586 if (parse_btype(&type, &ad)) {
3587 type_decl(&type, &ad, &n, TYPE_ABSTRACT);
3588 skip(')');
3589 /* check ISOC99 compound literal */
3590 if (tok == '{') {
3591 /* data is allocated locally by default */
3592 if (global_expr)
3593 r = VT_CONST;
3594 else
3595 r = VT_LOCAL;
3596 /* all except arrays are lvalues */
3597 if (!(type.t & VT_ARRAY))
3598 r |= lvalue_type(type.t);
3599 memset(&ad, 0, sizeof(AttributeDef));
3600 decl_initializer_alloc(&type, &ad, r, 1, 0, NULL, 0);
3601 } else {
3602 if (sizeof_caller) {
3603 vpush(&type);
3604 return;
3605 }
3606 unary();
3607 gen_cast(&type);
3608 }
3609 } else if (tok == '{') {
3610 /* save all registers */
3611 save_regs(0);
3612 /* statement expression : we do not accept break/continue
3613 inside as GCC does */
3614 block(NULL, NULL, NULL, NULL, 0, 1);
3615 skip(')');
3616 } else {
3617 gexpr();
3618 skip(')');
3619 }
3620 break;
3621 case '*':
3622 next();
3623 unary();
3624 indir();
3625 break;
3626 case '&':
3627 next();
3628 unary();
3629 /* functions names must be treated as function pointers,
3630 except for unary '&' and sizeof. Since we consider that
3631 functions are not lvalues, we only have to handle it
3632 there and in function calls. */
3633 /* arrays can also be used although they are not lvalues */
3634 if ((vtop->type.t & VT_BTYPE) != VT_FUNC &&
3635 !(vtop->type.t & VT_ARRAY) && !(vtop->type.t & VT_LLOCAL))
3636 test_lvalue();
3637 mk_pointer(&vtop->type);
3638 gaddrof();
3639 break;
3640 case '!':
3641 next();
3642 unary();
3643 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
3644 CType boolean;
3645 boolean.t = VT_BOOL;
3646 gen_cast(&boolean);
3647 vtop->c.i = !vtop->c.i;
3648 } else if ((vtop->r & VT_VALMASK) == VT_CMP)
3649 vtop->c.i = vtop->c.i ^ 1;
3650 else {
3651 save_regs(1);
3652 vseti(VT_JMP, gtst(1, 0));
3653 }
3654 break;
3655 case '~':
3656 next();
3657 unary();
3658 vpushi(-1);
3659 gen_op('^');
3660 break;
3661 case '+':
3662 next();
3663 /* in order to force cast, we add zero */
3664 unary();
3665 if ((vtop->type.t & VT_BTYPE) == VT_PTR)
3666 tcc_error("pointer not accepted for unary plus");
3667 vpushi(0);
3668 gen_op('+');
3669 break;
3670 case TOK_SIZEOF:
3671 case TOK_ALIGNOF1:
3672 case TOK_ALIGNOF2:
3673 t = tok;
3674 next();
3675 in_sizeof++;
3676 unary_type(&type); // Perform a in_sizeof = 0;
3677 size = type_size(&type, &align);
3678 if (t == TOK_SIZEOF) {
3679 if (!(type.t & VT_VLA)) {
3680 if (size < 0)
3681 tcc_error("sizeof applied to an incomplete type");
3682 vpushs(size);
3683 } else {
3684 vla_runtime_type_size(&type, &align);
3685 }
3686 } else {
3687 vpushs(align);
3688 }
3689 vtop->type.t |= VT_UNSIGNED;
3690 break;
3691
3692 case TOK_builtin_types_compatible_p:
3693 {
3694 CType type1, type2;
3695 next();
3696 skip('(');
3697 parse_type(&type1);
3698 skip(',');
3699 parse_type(&type2);
3700 skip(')');
3701 type1.t &= ~(VT_CONSTANT | VT_VOLATILE);
3702 type2.t &= ~(VT_CONSTANT | VT_VOLATILE);
3703 vpushi(is_compatible_types(&type1, &type2));
3704 }
3705 break;
3706 case TOK_builtin_constant_p:
3707 {
3708 int saved_nocode_wanted, res;
3709 next();
3710 skip('(');
3711 saved_nocode_wanted = nocode_wanted;
3712 nocode_wanted = 1;
3713 gexpr();
3714 res = (vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
3715 vpop();
3716 nocode_wanted = saved_nocode_wanted;
3717 skip(')');
3718 vpushi(res);
3719 }
3720 break;
3721 case TOK_builtin_frame_address:
3722 {
3723 int level;
3724 CType type;
3725 next();
3726 skip('(');
3727 if (tok != TOK_CINT || tokc.i < 0) {
3728 tcc_error("__builtin_frame_address only takes positive integers");
3729 }
3730 level = tokc.i;
3731 next();
3732 skip(')');
3733 type.t = VT_VOID;
3734 mk_pointer(&type);
3735 vset(&type, VT_LOCAL, 0); /* local frame */
3736 while (level--) {
3737 mk_pointer(&vtop->type);
3738 indir(); /* -> parent frame */
3739 }
3740 }
3741 break;
3742 #ifdef TCC_TARGET_X86_64
3743 #ifdef TCC_TARGET_PE
3744 case TOK_builtin_va_start:
3745 {
3746 next();
3747 skip('(');
3748 expr_eq();
3749 skip(',');
3750 expr_eq();
3751 skip(')');
3752 if ((vtop->r & VT_VALMASK) != VT_LOCAL)
3753 tcc_error("__builtin_va_start expects a local variable");
3754 vtop->r &= ~(VT_LVAL | VT_REF);
3755 vtop->type = char_pointer_type;
3756 vstore();
3757 }
3758 break;
3759 #else
3760 case TOK_builtin_va_arg_types:
3761 {
3762 CType type;
3763 int bt;
3764 next();
3765 skip('(');
3766 parse_type(&type);
3767 skip(')');
3768 vpushi(classify_x86_64_va_arg(&type));
3769 }
3770 break;
3771 #endif
3772 #endif
3773 case TOK_INC:
3774 case TOK_DEC:
3775 t = tok;
3776 next();
3777 unary();
3778 inc(0, t);
3779 break;
3780 case '-':
3781 next();
3782 vpushi(0);
3783 unary();
3784 gen_op('-');
3785 break;
3786 case TOK_LAND:
3787 if (!gnu_ext)
3788 goto tok_identifier;
3789 next();
3790 /* allow to take the address of a label */
3791 if (tok < TOK_UIDENT)
3792 expect("label identifier");
3793 s = label_find(tok);
3794 if (!s) {
3795 s = label_push(&global_label_stack, tok, LABEL_FORWARD);
3796 } else {
3797 if (s->r == LABEL_DECLARED)
3798 s->r = LABEL_FORWARD;
3799 }
3800 if (!s->type.t) {
3801 s->type.t = VT_VOID;
3802 mk_pointer(&s->type);
3803 s->type.t |= VT_STATIC;
3804 }
3805 vset(&s->type, VT_CONST | VT_SYM, 0);
3806 vtop->sym = s;
3807 next();
3808 break;
3809
3810 // special qnan , snan and infinity values
3811 case TOK___NAN__:
3812 vpush64(VT_DOUBLE, 0x7ff8000000000000ULL);
3813 next();
3814 break;
3815 case TOK___SNAN__:
3816 vpush64(VT_DOUBLE, 0x7ff0000000000001ULL);
3817 next();
3818 break;
3819 case TOK___INF__:
3820 vpush64(VT_DOUBLE, 0x7ff0000000000000ULL);
3821 next();
3822 break;
3823
3824 default:
3825 tok_identifier:
3826 t = tok;
3827 next();
3828 if (t < TOK_UIDENT)
3829 expect("identifier");
3830 s = sym_find(t);
3831 if (!s) {
3832 if (tok != '(')
3833 tcc_error("'%s' undeclared", get_tok_str(t, NULL));
3834 /* for simple function calls, we tolerate undeclared
3835 external reference to int() function */
3836 if (tcc_state->warn_implicit_function_declaration)
3837 tcc_warning("implicit declaration of function '%s'",
3838 get_tok_str(t, NULL));
3839 s = external_global_sym(t, &func_old_type, 0);
3840 }
3841 if ((s->type.t & (VT_STATIC | VT_INLINE | VT_BTYPE)) ==
3842 (VT_STATIC | VT_INLINE | VT_FUNC)) {
3843 /* if referencing an inline function, then we generate a
3844 symbol to it if not already done. It will have the
3845 effect to generate code for it at the end of the
3846 compilation unit. Inline function as always
3847 generated in the text section. */
3848 if (!s->c)
3849 put_extern_sym(s, text_section, 0, 0);
3850 r = VT_SYM | VT_CONST;
3851 } else {
3852 r = s->r;
3853 }
3854 vset(&s->type, r, s->c);
3855 /* if forward reference, we must point to s */
3856 if (vtop->r & VT_SYM) {
3857 vtop->sym = s;
3858 vtop->c.ul = 0;
3859 }
3860 break;
3861 }
3862
3863 /* post operations */
3864 while (1) {
3865 if (tok == TOK_INC || tok == TOK_DEC) {
3866 inc(1, tok);
3867 next();
3868 } else if (tok == '.' || tok == TOK_ARROW) {
3869 int qualifiers;
3870 /* field */
3871 if (tok == TOK_ARROW)
3872 indir();
3873 qualifiers = vtop->type.t & (VT_CONSTANT | VT_VOLATILE);
3874 test_lvalue();
3875 gaddrof();
3876 next();
3877 /* expect pointer on structure */
3878 if ((vtop->type.t & VT_BTYPE) != VT_STRUCT)
3879 expect("struct or union");
3880 s = vtop->type.ref;
3881 /* find field */
3882 tok |= SYM_FIELD;
3883 while ((s = s->next) != NULL) {
3884 if (s->v == tok)
3885 break;
3886 }
3887 if (!s)
3888 tcc_error("field not found: %s", get_tok_str(tok & ~SYM_FIELD, NULL));
3889 /* add field offset to pointer */
3890 vtop->type = char_pointer_type; /* change type to 'char *' */
3891 vpushi(s->c);
3892 gen_op('+');
3893 /* change type to field type, and set to lvalue */
3894 vtop->type = s->type;
3895 vtop->type.t |= qualifiers;
3896 /* an array is never an lvalue */
3897 if (!(vtop->type.t & VT_ARRAY)) {
3898 vtop->r |= lvalue_type(vtop->type.t);
3899 #ifdef CONFIG_TCC_BCHECK
3900 /* if bound checking, the referenced pointer must be checked */
3901 if (tcc_state->do_bounds_check)
3902 vtop->r |= VT_MUSTBOUND;
3903 #endif
3904 }
3905 next();
3906 } else if (tok == '[') {
3907 next();
3908 gexpr();
3909 gen_op('+');
3910 indir();
3911 skip(']');
3912 } else if (tok == '(') {
3913 SValue ret;
3914 Sym *sa;
3915 int nb_args, sret;
3916
3917 /* function call */
3918 if ((vtop->type.t & VT_BTYPE) != VT_FUNC) {
3919 /* pointer test (no array accepted) */
3920 if ((vtop->type.t & (VT_BTYPE | VT_ARRAY)) == VT_PTR) {
3921 vtop->type = *pointed_type(&vtop->type);
3922 if ((vtop->type.t & VT_BTYPE) != VT_FUNC)
3923 goto error_func;
3924 } else {
3925 error_func:
3926 expect("function pointer");
3927 }
3928 } else {
3929 vtop->r &= ~VT_LVAL; /* no lvalue */
3930 }
3931 /* get return type */
3932 s = vtop->type.ref;
3933 next();
3934 sa = s->next; /* first parameter */
3935 nb_args = 0;
3936 ret.r2 = VT_CONST;
3937 /* compute first implicit argument if a structure is returned */
3938 if ((s->type.t & VT_BTYPE) == VT_STRUCT) {
3939 int ret_align;
3940 sret = gfunc_sret(&s->type, &ret.type, &ret_align);
3941 if (sret) {
3942 /* get some space for the returned structure */
3943 size = type_size(&s->type, &align);
3944 loc = (loc - size) & -align;
3945 ret.type = s->type;
3946 ret.r = VT_LOCAL | VT_LVAL;
3947 /* pass it as 'int' to avoid structure arg passing
3948 problems */
3949 vseti(VT_LOCAL, loc);
3950 ret.c = vtop->c;
3951 nb_args++;
3952 }
3953 } else {
3954 sret = 0;
3955 ret.type = s->type;
3956 }
3957
3958 if (!sret) {
3959 /* return in register */
3960 if (is_float(ret.type.t)) {
3961 ret.r = reg_fret(ret.type.t);
3962 #ifdef TCC_TARGET_X86_64
3963 if ((ret.type.t & VT_BTYPE) == VT_QFLOAT)
3964 ret.r2 = REG_QRET;
3965 #endif
3966 } else {
3967 #ifdef TCC_TARGET_X86_64
3968 if ((ret.type.t & VT_BTYPE) == VT_QLONG)
3969 #else
3970 if ((ret.type.t & VT_BTYPE) == VT_LLONG)
3971 #endif
3972 ret.r2 = REG_LRET;
3973 ret.r = REG_IRET;
3974 }
3975 ret.c.i = 0;
3976 }
3977 if (tok != ')') {
3978 for(;;) {
3979 expr_eq();
3980 gfunc_param_typed(s, sa);
3981 nb_args++;
3982 if (sa)
3983 sa = sa->next;
3984 if (tok == ')')
3985 break;
3986 skip(',');
3987 }
3988 }
3989 if (sa)
3990 tcc_error("too few arguments to function");
3991 skip(')');
3992 if (!nocode_wanted) {
3993 gfunc_call(nb_args);
3994 } else {
3995 vtop -= (nb_args + 1);
3996 }
3997 /* return value */
3998 vsetc(&ret.type, ret.r, &ret.c);
3999 vtop->r2 = ret.r2;
4000 /* handle packed struct return */
4001 if (((s->type.t & VT_BTYPE) == VT_STRUCT) && !sret) {
4002 int addr;
4003 size = type_size(&s->type, &align);
4004 loc = (loc - size) & -align;
4005 addr = loc;
4006 vset(&ret.type, VT_LOCAL | VT_LVAL, addr);
4007 vswap();
4008 vstore();
4009 vtop--;
4010 vset(&s->type, VT_LOCAL | VT_LVAL, addr);
4011 }
4012 } else {
4013 break;
4014 }
4015 }
4016 }
4017
4018 ST_FUNC void expr_prod(void)
4019 {
4020 int t;
4021
4022 unary();
4023 while (tok == '*' || tok == '/' || tok == '%') {
4024 t = tok;
4025 next();
4026 unary();
4027 gen_op(t);
4028 }
4029 }
4030
4031 ST_FUNC void expr_sum(void)
4032 {
4033 int t;
4034
4035 expr_prod();
4036 while (tok == '+' || tok == '-') {
4037 t = tok;
4038 next();
4039 expr_prod();
4040 gen_op(t);
4041 }
4042 }
4043
4044 static void expr_shift(void)
4045 {
4046 int t;
4047
4048 expr_sum();
4049 while (tok == TOK_SHL || tok == TOK_SAR) {
4050 t = tok;
4051 next();
4052 expr_sum();
4053 gen_op(t);
4054 }
4055 }
4056
4057 static void expr_cmp(void)
4058 {
4059 int t;
4060
4061 expr_shift();
4062 while ((tok >= TOK_ULE && tok <= TOK_GT) ||
4063 tok == TOK_ULT || tok == TOK_UGE) {
4064 t = tok;
4065 next();
4066 expr_shift();
4067 gen_op(t);
4068 }
4069 }
4070
4071 static void expr_cmpeq(void)
4072 {
4073 int t;
4074
4075 expr_cmp();
4076 while (tok == TOK_EQ || tok == TOK_NE) {
4077 t = tok;
4078 next();
4079 expr_cmp();
4080 gen_op(t);
4081 }
4082 }
4083
4084 static void expr_and(void)
4085 {
4086 expr_cmpeq();
4087 while (tok == '&') {
4088 next();
4089 expr_cmpeq();
4090 gen_op('&');
4091 }
4092 }
4093
4094 static void expr_xor(void)
4095 {
4096 expr_and();
4097 while (tok == '^') {
4098 next();
4099 expr_and();
4100 gen_op('^');
4101 }
4102 }
4103
4104 static void expr_or(void)
4105 {
4106 expr_xor();
4107 while (tok == '|') {
4108 next();
4109 expr_xor();
4110 gen_op('|');
4111 }
4112 }
4113
4114 /* XXX: fix this mess */
4115 static void expr_land_const(void)
4116 {
4117 expr_or();
4118 while (tok == TOK_LAND) {
4119 next();
4120 expr_or();
4121 gen_op(TOK_LAND);
4122 }
4123 }
4124
4125 /* XXX: fix this mess */
4126 static void expr_lor_const(void)
4127 {
4128 expr_land_const();
4129 while (tok == TOK_LOR) {
4130 next();
4131 expr_land_const();
4132 gen_op(TOK_LOR);
4133 }
4134 }
4135
4136 /* only used if non constant */
4137 static void expr_land(void)
4138 {
4139 int t;
4140
4141 expr_or();
4142 if (tok == TOK_LAND) {
4143 t = 0;
4144 save_regs(1);
4145 for(;;) {
4146 t = gtst(1, t);
4147 if (tok != TOK_LAND) {
4148 vseti(VT_JMPI, t);
4149 break;
4150 }
4151 next();
4152 expr_or();
4153 }
4154 }
4155 }
4156
4157 static void expr_lor(void)
4158 {
4159 int t;
4160
4161 expr_land();
4162 if (tok == TOK_LOR) {
4163 t = 0;
4164 save_regs(1);
4165 for(;;) {
4166 t = gtst(0, t);
4167 if (tok != TOK_LOR) {
4168 vseti(VT_JMP, t);
4169 break;
4170 }
4171 next();
4172 expr_land();
4173 }
4174 }
4175 }
4176
4177 /* XXX: better constant handling */
4178 static void expr_cond(void)
4179 {
4180 int tt, u, r1, r2, rc, t1, t2, bt1, bt2;
4181 SValue sv;
4182 CType type, type1, type2;
4183
4184 if (const_wanted) {
4185 expr_lor_const();
4186 if (tok == '?') {
4187 CType boolean;
4188 int c;
4189 boolean.t = VT_BOOL;
4190 vdup();
4191 gen_cast(&boolean);
4192 c = vtop->c.i;
4193 vpop();
4194 next();
4195 if (tok != ':' || !gnu_ext) {
4196 vpop();
4197 gexpr();
4198 }
4199 if (!c)
4200 vpop();
4201 skip(':');
4202 expr_cond();
4203 if (c)
4204 vpop();
4205 }
4206 } else {
4207 expr_lor();
4208 if (tok == '?') {
4209 next();
4210 if (vtop != vstack) {
4211 /* needed to avoid having different registers saved in
4212 each branch */
4213 if (is_float(vtop->type.t)) {
4214 rc = RC_FLOAT;
4215 #ifdef TCC_TARGET_X86_64
4216 if ((vtop->type.t & VT_BTYPE) == VT_LDOUBLE) {
4217 rc = RC_ST0;
4218 }
4219 #endif
4220 }
4221 else
4222 rc = RC_INT;
4223 gv(rc);
4224 save_regs(1);
4225 }
4226 if (tok == ':' && gnu_ext) {
4227 gv_dup();
4228 tt = gtst(1, 0);
4229 } else {
4230 tt = gtst(1, 0);
4231 gexpr();
4232 }
4233 type1 = vtop->type;
4234 sv = *vtop; /* save value to handle it later */
4235 vtop--; /* no vpop so that FP stack is not flushed */
4236 skip(':');
4237 u = gjmp(0);
4238 gsym(tt);
4239 expr_cond();
4240 type2 = vtop->type;
4241
4242 t1 = type1.t;
4243 bt1 = t1 & VT_BTYPE;
4244 t2 = type2.t;
4245 bt2 = t2 & VT_BTYPE;
4246 /* cast operands to correct type according to ISOC rules */
4247 if (is_float(bt1) || is_float(bt2)) {
4248 if (bt1 == VT_LDOUBLE || bt2 == VT_LDOUBLE) {
4249 type.t = VT_LDOUBLE;
4250 } else if (bt1 == VT_DOUBLE || bt2 == VT_DOUBLE) {
4251 type.t = VT_DOUBLE;
4252 } else {
4253 type.t = VT_FLOAT;
4254 }
4255 } else if (bt1 == VT_LLONG || bt2 == VT_LLONG) {
4256 /* cast to biggest op */
4257 type.t = VT_LLONG;
4258 /* convert to unsigned if it does not fit in a long long */
4259 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED) ||
4260 (t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED))
4261 type.t |= VT_UNSIGNED;
4262 } else if (bt1 == VT_PTR || bt2 == VT_PTR) {
4263 /* If one is a null ptr constant the result type
4264 is the other. */
4265 if (is_null_pointer (vtop))
4266 type = type1;
4267 else if (is_null_pointer (&sv))
4268 type = type2;
4269 /* XXX: test pointer compatibility, C99 has more elaborate
4270 rules here. */
4271 else
4272 type = type1;
4273 } else if (bt1 == VT_FUNC || bt2 == VT_FUNC) {
4274 /* XXX: test function pointer compatibility */
4275 type = bt1 == VT_FUNC ? type1 : type2;
4276 } else if (bt1 == VT_STRUCT || bt2 == VT_STRUCT) {
4277 /* XXX: test structure compatibility */
4278 type = bt1 == VT_STRUCT ? type1 : type2;
4279 } else if (bt1 == VT_VOID || bt2 == VT_VOID) {
4280 /* NOTE: as an extension, we accept void on only one side */
4281 type.t = VT_VOID;
4282 } else {
4283 /* integer operations */
4284 type.t = VT_INT;
4285 /* convert to unsigned if it does not fit in an integer */
4286 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED) ||
4287 (t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED))
4288 type.t |= VT_UNSIGNED;
4289 }
4290
4291 /* now we convert second operand */
4292 gen_cast(&type);
4293 if (VT_STRUCT == (vtop->type.t & VT_BTYPE))
4294 gaddrof();
4295 rc = RC_INT;
4296 if (is_float(type.t)) {
4297 rc = RC_FLOAT;
4298 #ifdef TCC_TARGET_X86_64
4299 if ((type.t & VT_BTYPE) == VT_LDOUBLE) {
4300 rc = RC_ST0;
4301 }
4302 #endif
4303 } else if ((type.t & VT_BTYPE) == VT_LLONG) {
4304 /* for long longs, we use fixed registers to avoid having
4305 to handle a complicated move */
4306 rc = RC_IRET;
4307 }
4308
4309 r2 = gv(rc);
4310 /* this is horrible, but we must also convert first
4311 operand */
4312 tt = gjmp(0);
4313 gsym(u);
4314 /* put again first value and cast it */
4315 *vtop = sv;
4316 gen_cast(&type);
4317 if (VT_STRUCT == (vtop->type.t & VT_BTYPE))
4318 gaddrof();
4319 r1 = gv(rc);
4320 move_reg(r2, r1, type.t);
4321 vtop->r = r2;
4322 gsym(tt);
4323 }
4324 }
4325 }
4326
4327 static void expr_eq(void)
4328 {
4329 int t;
4330
4331 expr_cond();
4332 if (tok == '=' ||
4333 (tok >= TOK_A_MOD && tok <= TOK_A_DIV) ||
4334 tok == TOK_A_XOR || tok == TOK_A_OR ||
4335 tok == TOK_A_SHL || tok == TOK_A_SAR) {
4336 test_lvalue();
4337 t = tok;
4338 next();
4339 if (t == '=') {
4340 expr_eq();
4341 } else {
4342 vdup();
4343 expr_eq();
4344 gen_op(t & 0x7f);
4345 }
4346 vstore();
4347 }
4348 }
4349
4350 ST_FUNC void gexpr(void)
4351 {
4352 while (1) {
4353 expr_eq();
4354 if (tok != ',')
4355 break;
4356 vpop();
4357 next();
4358 }
4359 }
4360
4361 /* parse an expression and return its type without any side effect. */
4362 static void expr_type(CType *type)
4363 {
4364 int saved_nocode_wanted;
4365
4366 saved_nocode_wanted = nocode_wanted;
4367 nocode_wanted = 1;
4368 gexpr();
4369 *type = vtop->type;
4370 vpop();
4371 nocode_wanted = saved_nocode_wanted;
4372 }
4373
4374 /* parse a unary expression and return its type without any side
4375 effect. */
4376 static void unary_type(CType *type)
4377 {
4378 int a;
4379
4380 a = nocode_wanted;
4381 nocode_wanted = 1;
4382 unary();
4383 *type = vtop->type;
4384 vpop();
4385 nocode_wanted = a;
4386 }
4387
4388 /* parse a constant expression and return value in vtop. */
4389 static void expr_const1(void)
4390 {
4391 int a;
4392 a = const_wanted;
4393 const_wanted = 1;
4394 expr_cond();
4395 const_wanted = a;
4396 }
4397
4398 /* parse an integer constant and return its value. */
4399 ST_FUNC int expr_const(void)
4400 {
4401 int c;
4402 expr_const1();
4403 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) != VT_CONST)
4404 expect("constant expression");
4405 c = vtop->c.i;
4406 vpop();
4407 return c;
4408 }
4409
4410 /* return the label token if current token is a label, otherwise
4411 return zero */
4412 static int is_label(void)
4413 {
4414 int last_tok;
4415
4416 /* fast test first */
4417 if (tok < TOK_UIDENT)
4418 return 0;
4419 /* no need to save tokc because tok is an identifier */
4420 last_tok = tok;
4421 next();
4422 if (tok == ':') {
4423 next();
4424 return last_tok;
4425 } else {
4426 unget_tok(last_tok);
4427 return 0;
4428 }
4429 }
4430
4431 static void label_or_decl(int l)
4432 {
4433 int last_tok;
4434
4435 /* fast test first */
4436 if (tok >= TOK_UIDENT)
4437 {
4438 /* no need to save tokc because tok is an identifier */
4439 last_tok = tok;
4440 next();
4441 if (tok == ':') {
4442 unget_tok(last_tok);
4443 return;
4444 }
4445 unget_tok(last_tok);
4446 }
4447 decl(l);
4448 }
4449
4450 static void block(int *bsym, int *csym, int *case_sym, int *def_sym,
4451 int case_reg, int is_expr)
4452 {
4453 int a, b, c, d;
4454 Sym *s, *frame_bottom;
4455
4456 /* generate line number info */
4457 if (tcc_state->do_debug &&
4458 (last_line_num != file->line_num || last_ind != ind)) {
4459 put_stabn(N_SLINE, 0, file->line_num, ind - func_ind);
4460 last_ind = ind;
4461 last_line_num = file->line_num;
4462 }
4463
4464 if (is_expr) {
4465 /* default return value is (void) */
4466 vpushi(0);
4467 vtop->type.t = VT_VOID;
4468 }
4469
4470 if (tok == TOK_IF) {
4471 /* if test */
4472 next();
4473 skip('(');
4474 gexpr();
4475 skip(')');
4476 a = gtst(1, 0);
4477 block(bsym, csym, case_sym, def_sym, case_reg, 0);
4478 c = tok;
4479 if (c == TOK_ELSE) {
4480 next();
4481 d = gjmp(0);
4482 gsym(a);
4483 block(bsym, csym, case_sym, def_sym, case_reg, 0);
4484 gsym(d); /* patch else jmp */
4485 } else
4486 gsym(a);
4487 } else if (tok == TOK_WHILE) {
4488 next();
4489 d = ind;
4490 skip('(');
4491 gexpr();
4492 skip(')');
4493 a = gtst(1, 0);
4494 b = 0;
4495 block(&a, &b, case_sym, def_sym, case_reg, 0);
4496 gjmp_addr(d);
4497 gsym(a);
4498 gsym_addr(b, d);
4499 } else if (tok == '{') {
4500 Sym *llabel;
4501 int block_vla_sp_loc, *saved_vla_sp_loc, saved_vla_flags;
4502
4503 next();
4504 /* record local declaration stack position */
4505 s = local_stack;
4506 frame_bottom = sym_push2(&local_stack, SYM_FIELD, 0, 0);
4507 frame_bottom->next = scope_stack_bottom;
4508 scope_stack_bottom = frame_bottom;
4509 llabel = local_label_stack;
4510
4511 /* save VLA state */
4512 block_vla_sp_loc = *(saved_vla_sp_loc = vla_sp_loc);
4513 if (saved_vla_sp_loc != &vla_sp_root_loc)
4514 vla_sp_loc = &block_vla_sp_loc;
4515
4516 saved_vla_flags = vla_flags;
4517 vla_flags |= VLA_NEED_NEW_FRAME;
4518
4519 /* handle local labels declarations */
4520 if (tok == TOK_LABEL) {
4521 next();
4522 for(;;) {
4523 if (tok < TOK_UIDENT)
4524 expect("label identifier");
4525 label_push(&local_label_stack, tok, LABEL_DECLARED);
4526 next();
4527 if (tok == ',') {
4528 next();
4529 } else {
4530 skip(';');
4531 break;
4532 }
4533 }
4534 }
4535 while (tok != '}') {
4536 label_or_decl(VT_LOCAL);
4537 if (tok != '}') {
4538 if (is_expr)
4539 vpop();
4540 block(bsym, csym, case_sym, def_sym, case_reg, is_expr);
4541 }
4542 }
4543 /* pop locally defined labels */
4544 label_pop(&local_label_stack, llabel);
4545 if(is_expr) {
4546 /* XXX: this solution makes only valgrind happy...
4547 triggered by gcc.c-torture/execute/20000917-1.c */
4548 Sym *p;
4549 switch(vtop->type.t & VT_BTYPE) {
4550 case VT_PTR:
4551 case VT_STRUCT:
4552 case VT_ENUM:
4553 case VT_FUNC:
4554 for(p=vtop->type.ref;p;p=p->prev)
4555 if(p->prev==s)
4556 tcc_error("unsupported expression type");
4557 }
4558 }
4559 /* pop locally defined symbols */
4560 scope_stack_bottom = scope_stack_bottom->next;
4561 sym_pop(&local_stack, s);
4562
4563 /* Pop VLA frames and restore stack pointer if required */
4564 if (saved_vla_sp_loc != &vla_sp_root_loc)
4565 *saved_vla_sp_loc = block_vla_sp_loc;
4566 if (vla_sp_loc != (saved_vla_sp_loc == &vla_sp_root_loc ? &vla_sp_root_loc : &block_vla_sp_loc)) {
4567 vla_sp_loc = saved_vla_sp_loc;
4568 gen_vla_sp_restore(*vla_sp_loc);
4569 }
4570 vla_flags = (vla_flags & ~VLA_SCOPE_FLAGS) | (saved_vla_flags & VLA_SCOPE_FLAGS);
4571
4572 next();
4573 } else if (tok == TOK_RETURN) {
4574 next();
4575 if (tok != ';') {
4576 gexpr();
4577 gen_assign_cast(&func_vt);
4578 if ((func_vt.t & VT_BTYPE) == VT_STRUCT) {
4579 CType type, ret_type;
4580 int ret_align;
4581 if (gfunc_sret(&func_vt, &ret_type, &ret_align)) {
4582 /* if returning structure, must copy it to implicit
4583 first pointer arg location */
4584 type = func_vt;
4585 mk_pointer(&type);
4586 vset(&type, VT_LOCAL | VT_LVAL, func_vc);
4587 indir();
4588 vswap();
4589 /* copy structure value to pointer */
4590 vstore();
4591 } else {
4592 /* returning structure packed into registers */
4593 int size, addr, align;
4594 size = type_size(&func_vt,&align);
4595 if ((vtop->r != (VT_LOCAL | VT_LVAL) || (vtop->c.i & (ret_align-1)))
4596 && (align & (ret_align-1))) {
4597 loc = (loc - size) & -align;
4598 addr = loc;
4599 type = func_vt;
4600 vset(&type, VT_LOCAL | VT_LVAL, addr);
4601 vswap();
4602 vstore();
4603 vset(&ret_type, VT_LOCAL | VT_LVAL, addr);
4604 }
4605 vtop->type = ret_type;
4606 if (is_float(ret_type.t))
4607 gv(rc_fret(ret_type.t));
4608 else
4609 gv(RC_IRET);
4610 }
4611 } else if (is_float(func_vt.t)) {
4612 gv(rc_fret(func_vt.t));
4613 } else {
4614 gv(RC_IRET);
4615 }
4616 vtop--; /* NOT vpop() because on x86 it would flush the fp stack */
4617 }
4618 skip(';');
4619 rsym = gjmp(rsym); /* jmp */
4620 } else if (tok == TOK_BREAK) {
4621 /* compute jump */
4622 if (!bsym)
4623 tcc_error("cannot break");
4624 *bsym = gjmp(*bsym);
4625 next();
4626 skip(';');
4627 } else if (tok == TOK_CONTINUE) {
4628 /* compute jump */
4629 if (!csym)
4630 tcc_error("cannot continue");
4631 *csym = gjmp(*csym);
4632 next();
4633 skip(';');
4634 } else if (tok == TOK_FOR) {
4635 int e;
4636 next();
4637 skip('(');
4638 s = local_stack;
4639 frame_bottom = sym_push2(&local_stack, SYM_FIELD, 0, 0);
4640 frame_bottom->next = scope_stack_bottom;
4641 scope_stack_bottom = frame_bottom;
4642 if (tok != ';') {
4643 /* c99 for-loop init decl? */
4644 if (!decl0(VT_LOCAL, 1)) {
4645 /* no, regular for-loop init expr */
4646 gexpr();
4647 vpop();
4648 }
4649 }
4650 skip(';');
4651 d = ind;
4652 c = ind;
4653 a = 0;
4654 b = 0;
4655 if (tok != ';') {
4656 gexpr();
4657 a = gtst(1, 0);
4658 }
4659 skip(';');
4660 if (tok != ')') {
4661 e = gjmp(0);
4662 c = ind;
4663 gexpr();
4664 vpop();
4665 gjmp_addr(d);
4666 gsym(e);
4667 }
4668 skip(')');
4669 block(&a, &b, case_sym, def_sym, case_reg, 0);
4670 gjmp_addr(c);
4671 gsym(a);
4672 gsym_addr(b, c);
4673 scope_stack_bottom = scope_stack_bottom->next;
4674 sym_pop(&local_stack, s);
4675 } else
4676 if (tok == TOK_DO) {
4677 next();
4678 a = 0;
4679 b = 0;
4680 d = ind;
4681 block(&a, &b, case_sym, def_sym, case_reg, 0);
4682 skip(TOK_WHILE);
4683 skip('(');
4684 gsym(b);
4685 gexpr();
4686 c = gtst(0, 0);
4687 gsym_addr(c, d);
4688 skip(')');
4689 gsym(a);
4690 skip(';');
4691 } else
4692 if (tok == TOK_SWITCH) {
4693 next();
4694 skip('(');
4695 gexpr();
4696 /* XXX: other types than integer */
4697 case_reg = gv(RC_INT);
4698 vpop();
4699 skip(')');
4700 a = 0;
4701 b = gjmp(0); /* jump to first case */
4702 c = 0;
4703 block(&a, csym, &b, &c, case_reg, 0);
4704 /* if no default, jmp after switch */
4705 if (c == 0)
4706 c = ind;
4707 /* default label */
4708 gsym_addr(b, c);
4709 /* break label */
4710 gsym(a);
4711 } else
4712 if (tok == TOK_CASE) {
4713 int v1, v2;
4714 if (!case_sym)
4715 expect("switch");
4716 next();
4717 v1 = expr_const();
4718 v2 = v1;
4719 if (gnu_ext && tok == TOK_DOTS) {
4720 next();
4721 v2 = expr_const();
4722 if (v2 < v1)
4723 tcc_warning("empty case range");
4724 }
4725 /* since a case is like a label, we must skip it with a jmp */
4726 b = gjmp(0);
4727 gsym(*case_sym);
4728 vseti(case_reg, 0);
4729 vpushi(v1);
4730 if (v1 == v2) {
4731 gen_op(TOK_EQ);
4732 *case_sym = gtst(1, 0);
4733 } else {
4734 gen_op(TOK_GE);
4735 *case_sym = gtst(1, 0);
4736 vseti(case_reg, 0);
4737 vpushi(v2);
4738 gen_op(TOK_LE);
4739 *case_sym = gtst(1, *case_sym);
4740 }
4741 gsym(b);
4742 skip(':');
4743 is_expr = 0;
4744 goto block_after_label;
4745 } else
4746 if (tok == TOK_DEFAULT) {
4747 next();
4748 skip(':');
4749 if (!def_sym)
4750 expect("switch");
4751 if (*def_sym)
4752 tcc_error("too many 'default'");
4753 *def_sym = ind;
4754 is_expr = 0;
4755 goto block_after_label;
4756 } else
4757 if (tok == TOK_GOTO) {
4758 next();
4759 if (tok == '*' && gnu_ext) {
4760 /* computed goto */
4761 next();
4762 gexpr();
4763 if ((vtop->type.t & VT_BTYPE) != VT_PTR)
4764 expect("pointer");
4765 ggoto();
4766 } else if (tok >= TOK_UIDENT) {
4767 s = label_find(tok);
4768 /* put forward definition if needed */
4769 if (!s) {
4770 s = label_push(&global_label_stack, tok, LABEL_FORWARD);
4771 } else {
4772 if (s->r == LABEL_DECLARED)
4773 s->r = LABEL_FORWARD;
4774 }
4775 /* label already defined */
4776 if (vla_flags & VLA_IN_SCOPE) {
4777 /* If VLAs are in use, save the current stack pointer and
4778 reset the stack pointer to what it was at function entry
4779 (label will restore stack pointer in inner scopes) */
4780 vla_sp_save();
4781 gen_vla_sp_restore(vla_sp_root_loc);
4782 }
4783 if (s->r & LABEL_FORWARD)
4784 s->jnext = gjmp(s->jnext);
4785 else
4786 gjmp_addr(s->jnext);
4787 next();
4788 } else {
4789 expect("label identifier");
4790 }
4791 skip(';');
4792 } else if (tok == TOK_ASM1 || tok == TOK_ASM2 || tok == TOK_ASM3) {
4793 asm_instr();
4794 } else {
4795 b = is_label();
4796 if (b) {
4797 /* label case */
4798 if (vla_flags & VLA_IN_SCOPE) {
4799 /* save/restore stack pointer across label
4800 this is a no-op when combined with the load immediately
4801 after the label unless we arrive via goto */
4802 vla_sp_save();
4803 }
4804 s = label_find(b);
4805 if (s) {
4806 if (s->r == LABEL_DEFINED)
4807 tcc_error("duplicate label '%s'", get_tok_str(s->v, NULL));
4808 gsym(s->jnext);
4809 s->r = LABEL_DEFINED;
4810 } else {
4811 s = label_push(&global_label_stack, b, LABEL_DEFINED);
4812 }
4813 s->jnext = ind;
4814 if (vla_flags & VLA_IN_SCOPE) {
4815 gen_vla_sp_restore(*vla_sp_loc);
4816 vla_flags |= VLA_NEED_NEW_FRAME;
4817 }
4818 /* we accept this, but it is a mistake */
4819 block_after_label:
4820 if (tok == '}') {
4821 tcc_warning("deprecated use of label at end of compound statement");
4822 } else {
4823 if (is_expr)
4824 vpop();
4825 block(bsym, csym, case_sym, def_sym, case_reg, is_expr);
4826 }
4827 } else {
4828 /* expression case */
4829 if (tok != ';') {
4830 if (is_expr) {
4831 vpop();
4832 gexpr();
4833 } else {
4834 gexpr();
4835 vpop();
4836 }
4837 }
4838 skip(';');
4839 }
4840 }
4841 }
4842
4843 /* t is the array or struct type. c is the array or struct
4844 address. cur_index/cur_field is the pointer to the current
4845 value. 'size_only' is true if only size info is needed (only used
4846 in arrays) */
4847 static void decl_designator(CType *type, Section *sec, unsigned long c,
4848 int *cur_index, Sym **cur_field,
4849 int size_only)
4850 {
4851 Sym *s, *f;
4852 int notfirst, index, index_last, align, l, nb_elems, elem_size;
4853 CType type1;
4854
4855 notfirst = 0;
4856 elem_size = 0;
4857 nb_elems = 1;
4858 if (gnu_ext && (l = is_label()) != 0)
4859 goto struct_field;
4860 while (tok == '[' || tok == '.') {
4861 if (tok == '[') {
4862 if (!(type->t & VT_ARRAY))
4863 expect("array type");
4864 s = type->ref;
4865 next();
4866 index = expr_const();
4867 if (index < 0 || (s->c >= 0 && index >= s->c))
4868 expect("invalid index");
4869 if (tok == TOK_DOTS && gnu_ext) {
4870 next();
4871 index_last = expr_const();
4872 if (index_last < 0 ||
4873 (s->c >= 0 && index_last >= s->c) ||
4874 index_last < index)
4875 expect("invalid index");
4876 } else {
4877 index_last = index;
4878 }
4879 skip(']');
4880 if (!notfirst)
4881 *cur_index = index_last;
4882 type = pointed_type(type);
4883 elem_size = type_size(type, &align);
4884 c += index * elem_size;
4885 /* NOTE: we only support ranges for last designator */
4886 nb_elems = index_last - index + 1;
4887 if (nb_elems != 1) {
4888 notfirst = 1;
4889 break;
4890 }
4891 } else {
4892 next();
4893 l = tok;
4894 next();
4895 struct_field:
4896 if ((type->t & VT_BTYPE) != VT_STRUCT)
4897 expect("struct/union type");
4898 s = type->ref;
4899 l |= SYM_FIELD;
4900 f = s->next;
4901 while (f) {
4902 if (f->v == l)
4903 break;
4904 f = f->next;
4905 }
4906 if (!f)
4907 expect("field");
4908 if (!notfirst)
4909 *cur_field = f;
4910 /* XXX: fix this mess by using explicit storage field */
4911 type1 = f->type;
4912 type1.t |= (type->t & ~VT_TYPE);
4913 type = &type1;
4914 c += f->c;
4915 }
4916 notfirst = 1;
4917 }
4918 if (notfirst) {
4919 if (tok == '=') {
4920 next();
4921 } else {
4922 if (!gnu_ext)
4923 expect("=");
4924 }
4925 } else {
4926 if (type->t & VT_ARRAY) {
4927 index = *cur_index;
4928 type = pointed_type(type);
4929 c += index * type_size(type, &align);
4930 } else {
4931 f = *cur_field;
4932 if (!f)
4933 tcc_error("too many field init");
4934 /* XXX: fix this mess by using explicit storage field */
4935 type1 = f->type;
4936 type1.t |= (type->t & ~VT_TYPE);
4937 type = &type1;
4938 c += f->c;
4939 }
4940 }
4941 decl_initializer(type, sec, c, 0, size_only);
4942
4943 /* XXX: make it more general */
4944 if (!size_only && nb_elems > 1) {
4945 unsigned long c_end;
4946 uint8_t *src, *dst;
4947 int i;
4948
4949 if (!sec)
4950 tcc_error("range init not supported yet for dynamic storage");
4951 c_end = c + nb_elems * elem_size;
4952 if (c_end > sec->data_allocated)
4953 section_realloc(sec, c_end);
4954 src = sec->data + c;
4955 dst = src;
4956 for(i = 1; i < nb_elems; i++) {
4957 dst += elem_size;
4958 memcpy(dst, src, elem_size);
4959 }
4960 }
4961 }
4962
4963 #define EXPR_VAL 0
4964 #define EXPR_CONST 1
4965 #define EXPR_ANY 2
4966
4967 /* store a value or an expression directly in global data or in local array */
4968 static void init_putv(CType *type, Section *sec, unsigned long c,
4969 int v, int expr_type)
4970 {
4971 int saved_global_expr, bt, bit_pos, bit_size;
4972 void *ptr;
4973 unsigned long long bit_mask;
4974 CType dtype;
4975
4976 switch(expr_type) {
4977 case EXPR_VAL:
4978 vpushi(v);
4979 break;
4980 case EXPR_CONST:
4981 /* compound literals must be allocated globally in this case */
4982 saved_global_expr = global_expr;
4983 global_expr = 1;
4984 expr_const1();
4985 global_expr = saved_global_expr;
4986 /* NOTE: symbols are accepted */
4987 if ((vtop->r & (VT_VALMASK | VT_LVAL)) != VT_CONST)
4988 tcc_error("initializer element is not constant");
4989 break;
4990 case EXPR_ANY:
4991 expr_eq();
4992 break;
4993 }
4994
4995 dtype = *type;
4996 dtype.t &= ~VT_CONSTANT; /* need to do that to avoid false warning */
4997
4998 if (sec) {
4999 /* XXX: not portable */
5000 /* XXX: generate error if incorrect relocation */
5001 gen_assign_cast(&dtype);
5002 bt = type->t & VT_BTYPE;
5003 /* we'll write at most 12 bytes */
5004 if (c + 12 > sec->data_allocated) {
5005 section_realloc(sec, c + 12);
5006 }
5007 ptr = sec->data + c;
5008 /* XXX: make code faster ? */
5009 if (!(type->t & VT_BITFIELD)) {
5010 bit_pos = 0;
5011 bit_size = 32;
5012 bit_mask = -1LL;
5013 } else {
5014 bit_pos = (vtop->type.t >> VT_STRUCT_SHIFT) & 0x3f;
5015 bit_size = (vtop->type.t >> (VT_STRUCT_SHIFT + 6)) & 0x3f;
5016 bit_mask = (1LL << bit_size) - 1;
5017 }
5018 if ((vtop->r & VT_SYM) &&
5019 (bt == VT_BYTE ||
5020 bt == VT_SHORT ||
5021 bt == VT_DOUBLE ||
5022 bt == VT_LDOUBLE ||
5023 bt == VT_LLONG ||
5024 (bt == VT_INT && bit_size != 32)))
5025 tcc_error("initializer element is not computable at load time");
5026 switch(bt) {
5027 case VT_BOOL:
5028 vtop->c.i = (vtop->c.i != 0);
5029 case VT_BYTE:
5030 *(char *)ptr |= (vtop->c.i & bit_mask) << bit_pos;
5031 break;
5032 case VT_SHORT:
5033 *(short *)ptr |= (vtop->c.i & bit_mask) << bit_pos;
5034 break;
5035 case VT_DOUBLE:
5036 *(double *)ptr = vtop->c.d;
5037 break;
5038 case VT_LDOUBLE:
5039 *(long double *)ptr = vtop->c.ld;
5040 break;
5041 case VT_LLONG:
5042 *(long long *)ptr |= (vtop->c.ll & bit_mask) << bit_pos;
5043 break;
5044 default:
5045 if (vtop->r & VT_SYM) {
5046 greloc(sec, vtop->sym, c, R_DATA_PTR);
5047 }
5048 *(int *)ptr |= (vtop->c.i & bit_mask) << bit_pos;
5049 break;
5050 }
5051 vtop--;
5052 } else {
5053 vset(&dtype, VT_LOCAL|VT_LVAL, c);
5054 vswap();
5055 vstore();
5056 vpop();
5057 }
5058 }
5059
5060 /* put zeros for variable based init */
5061 static void init_putz(CType *t, Section *sec, unsigned long c, int size)
5062 {
5063 if (sec) {
5064 /* nothing to do because globals are already set to zero */
5065 } else {
5066 vpush_global_sym(&func_old_type, TOK_memset);
5067 vseti(VT_LOCAL, c);
5068 vpushi(0);
5069 vpushs(size);
5070 gfunc_call(3);
5071 }
5072 }
5073
5074 /* 't' contains the type and storage info. 'c' is the offset of the
5075 object in section 'sec'. If 'sec' is NULL, it means stack based
5076 allocation. 'first' is true if array '{' must be read (multi
5077 dimension implicit array init handling). 'size_only' is true if
5078 size only evaluation is wanted (only for arrays). */
5079 static void decl_initializer(CType *type, Section *sec, unsigned long c,
5080 int first, int size_only)
5081 {
5082 int index, array_length, n, no_oblock, nb, parlevel, parlevel1, i;
5083 int size1, align1, expr_type;
5084 Sym *s, *f;
5085 CType *t1;
5086
5087 if (type->t & VT_VLA) {
5088 int a;
5089
5090 /* save current stack pointer */
5091 if (vla_flags & VLA_NEED_NEW_FRAME) {
5092 vla_sp_save();
5093 vla_flags = VLA_IN_SCOPE;
5094 vla_sp_loc = &vla_sp_loc_tmp;
5095 }
5096
5097 vla_runtime_type_size(type, &a);
5098 gen_vla_alloc(type, a);
5099 vset(type, VT_LOCAL|VT_LVAL, c);
5100 vswap();
5101 vstore();
5102 vpop();
5103 } else if (type->t & VT_ARRAY) {
5104 s = type->ref;
5105 n = s->c;
5106 array_length = 0;
5107 t1 = pointed_type(type);
5108 size1 = type_size(t1, &align1);
5109
5110 no_oblock = 1;
5111 if ((first && tok != TOK_LSTR && tok != TOK_STR) ||
5112 tok == '{') {
5113 if (tok != '{')
5114 tcc_error("character array initializer must be a literal,"
5115 " optionally enclosed in braces");
5116 skip('{');
5117 no_oblock = 0;
5118 }
5119
5120 /* only parse strings here if correct type (otherwise: handle
5121 them as ((w)char *) expressions */
5122 if ((tok == TOK_LSTR &&
5123 #ifdef TCC_TARGET_PE
5124 (t1->t & VT_BTYPE) == VT_SHORT && (t1->t & VT_UNSIGNED)
5125 #else
5126 (t1->t & VT_BTYPE) == VT_INT
5127 #endif
5128 ) || (tok == TOK_STR && (t1->t & VT_BTYPE) == VT_BYTE)) {
5129 while (tok == TOK_STR || tok == TOK_LSTR) {
5130 int cstr_len, ch;
5131 CString *cstr;
5132
5133 cstr = tokc.cstr;
5134 /* compute maximum number of chars wanted */
5135 if (tok == TOK_STR)
5136 cstr_len = cstr->size;
5137 else
5138 cstr_len = cstr->size / sizeof(nwchar_t);
5139 cstr_len--;
5140 nb = cstr_len;
5141 if (n >= 0 && nb > (n - array_length))
5142 nb = n - array_length;
5143 if (!size_only) {
5144 if (cstr_len > nb)
5145 tcc_warning("initializer-string for array is too long");
5146 /* in order to go faster for common case (char
5147 string in global variable, we handle it
5148 specifically */
5149 if (sec && tok == TOK_STR && size1 == 1) {
5150 memcpy(sec->data + c + array_length, cstr->data, nb);
5151 } else {
5152 for(i=0;i<nb;i++) {
5153 if (tok == TOK_STR)
5154 ch = ((unsigned char *)cstr->data)[i];
5155 else
5156 ch = ((nwchar_t *)cstr->data)[i];
5157 init_putv(t1, sec, c + (array_length + i) * size1,
5158 ch, EXPR_VAL);
5159 }
5160 }
5161 }
5162 array_length += nb;
5163 next();
5164 }
5165 /* only add trailing zero if enough storage (no
5166 warning in this case since it is standard) */
5167 if (n < 0 || array_length < n) {
5168 if (!size_only) {
5169 init_putv(t1, sec, c + (array_length * size1), 0, EXPR_VAL);
5170 }
5171 array_length++;
5172 }
5173 } else {
5174 index = 0;
5175 while (tok != '}') {
5176 decl_designator(type, sec, c, &index, NULL, size_only);
5177 if (n >= 0 && index >= n)
5178 tcc_error("index too large");
5179 /* must put zero in holes (note that doing it that way
5180 ensures that it even works with designators) */
5181 if (!size_only && array_length < index) {
5182 init_putz(t1, sec, c + array_length * size1,
5183 (index - array_length) * size1);
5184 }
5185 index++;
5186 if (index > array_length)
5187 array_length = index;
5188 /* special test for multi dimensional arrays (may not
5189 be strictly correct if designators are used at the
5190 same time) */
5191 if (index >= n && no_oblock)
5192 break;
5193 if (tok == '}')
5194 break;
5195 skip(',');
5196 }
5197 }
5198 if (!no_oblock)
5199 skip('}');
5200 /* put zeros at the end */
5201 if (!size_only && n >= 0 && array_length < n) {
5202 init_putz(t1, sec, c + array_length * size1,
5203 (n - array_length) * size1);
5204 }
5205 /* patch type size if needed */
5206 if (n < 0)
5207 s->c = array_length;
5208 } else if ((type->t & VT_BTYPE) == VT_STRUCT &&
5209 (sec || !first || tok == '{')) {
5210 int par_count;
5211
5212 /* NOTE: the previous test is a specific case for automatic
5213 struct/union init */
5214 /* XXX: union needs only one init */
5215
5216 /* XXX: this test is incorrect for local initializers
5217 beginning with ( without {. It would be much more difficult
5218 to do it correctly (ideally, the expression parser should
5219 be used in all cases) */
5220 par_count = 0;
5221 if (tok == '(') {
5222 AttributeDef ad1;
5223 CType type1;
5224 next();
5225 while (tok == '(') {
5226 par_count++;
5227 next();
5228 }
5229 if (!parse_btype(&type1, &ad1))
5230 expect("cast");
5231 type_decl(&type1, &ad1, &n, TYPE_ABSTRACT);
5232 #if 0
5233 if (!is_assignable_types(type, &type1))
5234 tcc_error("invalid type for cast");
5235 #endif
5236 skip(')');
5237 }
5238 no_oblock = 1;
5239 if (first || tok == '{') {
5240 skip('{');
5241 no_oblock = 0;
5242 }
5243 s = type->ref;
5244 f = s->next;
5245 array_length = 0;
5246 index = 0;
5247 n = s->c;
5248 while (tok != '}') {
5249 decl_designator(type, sec, c, NULL, &f, size_only);
5250 index = f->c;
5251 if (!size_only && array_length < index) {
5252 init_putz(type, sec, c + array_length,
5253 index - array_length);
5254 }
5255 index = index + type_size(&f->type, &align1);
5256 if (index > array_length)
5257 array_length = index;
5258
5259 /* gr: skip fields from same union - ugly. */
5260 while (f->next) {
5261 ///printf("index: %2d %08x -- %2d %08x\n", f->c, f->type.t, f->next->c, f->next->type.t);
5262 /* test for same offset */
5263 if (f->next->c != f->c)
5264 break;
5265 /* if yes, test for bitfield shift */
5266 if ((f->type.t & VT_BITFIELD) && (f->next->type.t & VT_BITFIELD)) {
5267 int bit_pos_1 = (f->type.t >> VT_STRUCT_SHIFT) & 0x3f;
5268 int bit_pos_2 = (f->next->type.t >> VT_STRUCT_SHIFT) & 0x3f;
5269 //printf("bitfield %d %d\n", bit_pos_1, bit_pos_2);
5270 if (bit_pos_1 != bit_pos_2)
5271 break;
5272 }
5273 f = f->next;
5274 }
5275
5276 f = f->next;
5277 if (no_oblock && f == NULL)
5278 break;
5279 if (tok == '}')
5280 break;
5281 skip(',');
5282 }
5283 /* put zeros at the end */
5284 if (!size_only && array_length < n) {
5285 init_putz(type, sec, c + array_length,
5286 n - array_length);
5287 }
5288 if (!no_oblock)
5289 skip('}');
5290 while (par_count) {
5291 skip(')');
5292 par_count--;
5293 }
5294 } else if (tok == '{') {
5295 next();
5296 decl_initializer(type, sec, c, first, size_only);
5297 skip('}');
5298 } else if (size_only) {
5299 /* just skip expression */
5300 parlevel = parlevel1 = 0;
5301 while ((parlevel > 0 || parlevel1 > 0 ||
5302 (tok != '}' && tok != ',')) && tok != -1) {
5303 if (tok == '(')
5304 parlevel++;
5305 else if (tok == ')')
5306 parlevel--;
5307 else if (tok == '{')
5308 parlevel1++;
5309 else if (tok == '}')
5310 parlevel1--;
5311 next();
5312 }
5313 } else {
5314 /* currently, we always use constant expression for globals
5315 (may change for scripting case) */
5316 expr_type = EXPR_CONST;
5317 if (!sec)
5318 expr_type = EXPR_ANY;
5319 init_putv(type, sec, c, 0, expr_type);
5320 }
5321 }
5322
5323 /* parse an initializer for type 't' if 'has_init' is non zero, and
5324 allocate space in local or global data space ('r' is either
5325 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
5326 variable 'v' with an associated name represented by 'asm_label' of
5327 scope 'scope' is declared before initializers are parsed. If 'v' is
5328 zero, then a reference to the new object is put in the value stack.
5329 If 'has_init' is 2, a special parsing is done to handle string
5330 constants. */
5331 static void decl_initializer_alloc(CType *type, AttributeDef *ad, int r,
5332 int has_init, int v, char *asm_label,
5333 int scope)
5334 {
5335 int size, align, addr, data_offset;
5336 int level;
5337 ParseState saved_parse_state = {0};
5338 TokenString init_str;
5339 Section *sec;
5340 Sym *flexible_array;
5341
5342 flexible_array = NULL;
5343 if ((type->t & VT_BTYPE) == VT_STRUCT) {
5344 Sym *field = type->ref->next;
5345 if (field) {
5346 while (field->next)
5347 field = field->next;
5348 if (field->type.t & VT_ARRAY && field->type.ref->c < 0)
5349 flexible_array = field;
5350 }
5351 }
5352
5353 size = type_size(type, &align);
5354 /* If unknown size, we must evaluate it before
5355 evaluating initializers because
5356 initializers can generate global data too
5357 (e.g. string pointers or ISOC99 compound
5358 literals). It also simplifies local
5359 initializers handling */
5360 tok_str_new(&init_str);
5361 if (size < 0 || (flexible_array && has_init)) {
5362 if (!has_init)
5363 tcc_error("unknown type size");
5364 /* get all init string */
5365 if (has_init == 2) {
5366 /* only get strings */
5367 while (tok == TOK_STR || tok == TOK_LSTR) {
5368 tok_str_add_tok(&init_str);
5369 next();
5370 }
5371 } else {
5372 level = 0;
5373 while (level > 0 || (tok != ',' && tok != ';')) {
5374 if (tok < 0)
5375 tcc_error("unexpected end of file in initializer");
5376 tok_str_add_tok(&init_str);
5377 if (tok == '{')
5378 level++;
5379 else if (tok == '}') {
5380 level--;
5381 if (level <= 0) {
5382 next();
5383 break;
5384 }
5385 }
5386 next();
5387 }
5388 }
5389 tok_str_add(&init_str, -1);
5390 tok_str_add(&init_str, 0);
5391
5392 /* compute size */
5393 save_parse_state(&saved_parse_state);
5394
5395 macro_ptr = init_str.str;
5396 next();
5397 decl_initializer(type, NULL, 0, 1, 1);
5398 /* prepare second initializer parsing */
5399 macro_ptr = init_str.str;
5400 next();
5401
5402 /* if still unknown size, error */
5403 size = type_size(type, &align);
5404 if (size < 0)
5405 tcc_error("unknown type size");
5406 }
5407 if (flexible_array)
5408 size += flexible_array->type.ref->c * pointed_size(&flexible_array->type);
5409 /* take into account specified alignment if bigger */
5410 if (ad->aligned) {
5411 if (ad->aligned > align)
5412 align = ad->aligned;
5413 } else if (ad->packed) {
5414 align = 1;
5415 }
5416 if ((r & VT_VALMASK) == VT_LOCAL) {
5417 sec = NULL;
5418 #ifdef CONFIG_TCC_BCHECK
5419 if (tcc_state->do_bounds_check && (type->t & VT_ARRAY)) {
5420 loc--;
5421 }
5422 #endif
5423 loc = (loc - size) & -align;
5424 addr = loc;
5425 #ifdef CONFIG_TCC_BCHECK
5426 /* handles bounds */
5427 /* XXX: currently, since we do only one pass, we cannot track
5428 '&' operators, so we add only arrays */
5429 if (tcc_state->do_bounds_check && (type->t & VT_ARRAY)) {
5430 unsigned long *bounds_ptr;
5431 /* add padding between regions */
5432 loc--;
5433 /* then add local bound info */
5434 bounds_ptr = section_ptr_add(lbounds_section, 2 * sizeof(unsigned long));
5435 bounds_ptr[0] = addr;
5436 bounds_ptr[1] = size;
5437 }
5438 #endif
5439 if (v) {
5440 /* local variable */
5441 sym_push(v, type, r, addr);
5442 } else {
5443 /* push local reference */
5444 vset(type, r, addr);
5445 }
5446 } else {
5447 Sym *sym;
5448
5449 sym = NULL;
5450 if (v && scope == VT_CONST) {
5451 /* see if the symbol was already defined */
5452 sym = sym_find(v);
5453 if (sym) {
5454 if (!is_compatible_types(&sym->type, type))
5455 tcc_error("incompatible types for redefinition of '%s'",
5456 get_tok_str(v, NULL));
5457 if (sym->type.t & VT_EXTERN) {
5458 /* if the variable is extern, it was not allocated */
5459 sym->type.t &= ~VT_EXTERN;
5460 /* set array size if it was ommited in extern
5461 declaration */
5462 if ((sym->type.t & VT_ARRAY) &&
5463 sym->type.ref->c < 0 &&
5464 type->ref->c >= 0)
5465 sym->type.ref->c = type->ref->c;
5466 } else {
5467 /* we accept several definitions of the same
5468 global variable. this is tricky, because we
5469 must play with the SHN_COMMON type of the symbol */
5470 /* XXX: should check if the variable was already
5471 initialized. It is incorrect to initialized it
5472 twice */
5473 /* no init data, we won't add more to the symbol */
5474 if (!has_init)
5475 goto no_alloc;
5476 }
5477 }
5478 }
5479
5480 /* allocate symbol in corresponding section */
5481 sec = ad->section;
5482 if (!sec) {
5483 if (has_init)
5484 sec = data_section;
5485 else if (tcc_state->nocommon)
5486 sec = bss_section;
5487 }
5488 if (sec) {
5489 data_offset = sec->data_offset;
5490 data_offset = (data_offset + align - 1) & -align;
5491 addr = data_offset;
5492 /* very important to increment global pointer at this time
5493 because initializers themselves can create new initializers */
5494 data_offset += size;
5495 #ifdef CONFIG_TCC_BCHECK
5496 /* add padding if bound check */
5497 if (tcc_state->do_bounds_check)
5498 data_offset++;
5499 #endif
5500 sec->data_offset = data_offset;
5501 /* allocate section space to put the data */
5502 if (sec->sh_type != SHT_NOBITS &&
5503 data_offset > sec->data_allocated)
5504 section_realloc(sec, data_offset);
5505 /* align section if needed */
5506 if (align > sec->sh_addralign)
5507 sec->sh_addralign = align;
5508 } else {
5509 addr = 0; /* avoid warning */
5510 }
5511
5512 if (v) {
5513 if (scope != VT_CONST || !sym) {
5514 sym = sym_push(v, type, r | VT_SYM, 0);
5515 sym->asm_label = asm_label;
5516 }
5517 /* update symbol definition */
5518 if (sec) {
5519 put_extern_sym(sym, sec, addr, size);
5520 } else {
5521 ElfW(Sym) *esym;
5522 /* put a common area */
5523 put_extern_sym(sym, NULL, align, size);
5524 /* XXX: find a nicer way */
5525 esym = &((ElfW(Sym) *)symtab_section->data)[sym->c];
5526 esym->st_shndx = SHN_COMMON;
5527 }
5528 } else {
5529 CValue cval;
5530
5531 /* push global reference */
5532 sym = get_sym_ref(type, sec, addr, size);
5533 cval.ul = 0;
5534 vsetc(type, VT_CONST | VT_SYM, &cval);
5535 vtop->sym = sym;
5536 }
5537 /* patch symbol weakness */
5538 if (type->t & VT_WEAK)
5539 weaken_symbol(sym);
5540 #ifdef CONFIG_TCC_BCHECK
5541 /* handles bounds now because the symbol must be defined
5542 before for the relocation */
5543 if (tcc_state->do_bounds_check) {
5544 unsigned long *bounds_ptr;
5545
5546 greloc(bounds_section, sym, bounds_section->data_offset, R_DATA_PTR);
5547 /* then add global bound info */
5548 bounds_ptr = section_ptr_add(bounds_section, 2 * sizeof(long));
5549 bounds_ptr[0] = 0; /* relocated */
5550 bounds_ptr[1] = size;
5551 }
5552 #endif
5553 }
5554 if (has_init || (type->t & VT_VLA)) {
5555 decl_initializer(type, sec, addr, 1, 0);
5556 /* restore parse state if needed */
5557 if (init_str.str) {
5558 tok_str_free(init_str.str);
5559 restore_parse_state(&saved_parse_state);
5560 }
5561 /* patch flexible array member size back to -1, */
5562 /* for possible subsequent similar declarations */
5563 if (flexible_array)
5564 flexible_array->type.ref->c = -1;
5565 }
5566 no_alloc: ;
5567 }
5568
5569 static void put_func_debug(Sym *sym)
5570 {
5571 char buf[512];
5572
5573 /* stabs info */
5574 /* XXX: we put here a dummy type */
5575 snprintf(buf, sizeof(buf), "%s:%c1",
5576 funcname, sym->type.t & VT_STATIC ? 'f' : 'F');
5577 put_stabs_r(buf, N_FUN, 0, file->line_num, 0,
5578 cur_text_section, sym->c);
5579 /* //gr gdb wants a line at the function */
5580 put_stabn(N_SLINE, 0, file->line_num, 0);
5581 last_ind = 0;
5582 last_line_num = 0;
5583 }
5584
5585 /* parse an old style function declaration list */
5586 /* XXX: check multiple parameter */
5587 static void func_decl_list(Sym *func_sym)
5588 {
5589 AttributeDef ad;
5590 int v;
5591 Sym *s;
5592 CType btype, type;
5593
5594 /* parse each declaration */
5595 while (tok != '{' && tok != ';' && tok != ',' && tok != TOK_EOF &&
5596 tok != TOK_ASM1 && tok != TOK_ASM2 && tok != TOK_ASM3) {
5597 if (!parse_btype(&btype, &ad))
5598 expect("declaration list");
5599 if (((btype.t & VT_BTYPE) == VT_ENUM ||
5600 (btype.t & VT_BTYPE) == VT_STRUCT) &&
5601 tok == ';') {
5602 /* we accept no variable after */
5603 } else {
5604 for(;;) {
5605 type = btype;
5606 type_decl(&type, &ad, &v, TYPE_DIRECT);
5607 /* find parameter in function parameter list */
5608 s = func_sym->next;
5609 while (s != NULL) {
5610 if ((s->v & ~SYM_FIELD) == v)
5611 goto found;
5612 s = s->next;
5613 }
5614 tcc_error("declaration for parameter '%s' but no such parameter",
5615 get_tok_str(v, NULL));
5616 found:
5617 /* check that no storage specifier except 'register' was given */
5618 if (type.t & VT_STORAGE)
5619 tcc_error("storage class specified for '%s'", get_tok_str(v, NULL));
5620 convert_parameter_type(&type);
5621 /* we can add the type (NOTE: it could be local to the function) */
5622 s->type = type;
5623 /* accept other parameters */
5624 if (tok == ',')
5625 next();
5626 else
5627 break;
5628 }
5629 }
5630 skip(';');
5631 }
5632 }
5633
5634 /* parse a function defined by symbol 'sym' and generate its code in
5635 'cur_text_section' */
5636 static void gen_function(Sym *sym)
5637 {
5638 int saved_nocode_wanted = nocode_wanted;
5639 nocode_wanted = 0;
5640 ind = cur_text_section->data_offset;
5641 /* NOTE: we patch the symbol size later */
5642 put_extern_sym(sym, cur_text_section, ind, 0);
5643 funcname = get_tok_str(sym->v, NULL);
5644 func_ind = ind;
5645 /* Initialize VLA state */
5646 vla_sp_loc = &vla_sp_root_loc;
5647 vla_flags = VLA_NEED_NEW_FRAME;
5648 /* put debug symbol */
5649 if (tcc_state->do_debug)
5650 put_func_debug(sym);
5651 /* push a dummy symbol to enable local sym storage */
5652 sym_push2(&local_stack, SYM_FIELD, 0, 0);
5653 gfunc_prolog(&sym->type);
5654 rsym = 0;
5655 block(NULL, NULL, NULL, NULL, 0, 0);
5656 gsym(rsym);
5657 gfunc_epilog();
5658 cur_text_section->data_offset = ind;
5659 label_pop(&global_label_stack, NULL);
5660 /* reset local stack */
5661 scope_stack_bottom = NULL;
5662 sym_pop(&local_stack, NULL);
5663 /* end of function */
5664 /* patch symbol size */
5665 ((ElfW(Sym) *)symtab_section->data)[sym->c].st_size =
5666 ind - func_ind;
5667 /* patch symbol weakness (this definition overrules any prototype) */
5668 if (sym->type.t & VT_WEAK)
5669 weaken_symbol(sym);
5670 if (tcc_state->do_debug) {
5671 put_stabn(N_FUN, 0, 0, ind - func_ind);
5672 }
5673 /* It's better to crash than to generate wrong code */
5674 cur_text_section = NULL;
5675 funcname = ""; /* for safety */
5676 func_vt.t = VT_VOID; /* for safety */
5677 ind = 0; /* for safety */
5678 nocode_wanted = saved_nocode_wanted;
5679 }
5680
5681 ST_FUNC void gen_inline_functions(void)
5682 {
5683 Sym *sym;
5684 int *str, inline_generated, i;
5685 struct InlineFunc *fn;
5686
5687 /* iterate while inline function are referenced */
5688 for(;;) {
5689 inline_generated = 0;
5690 for (i = 0; i < tcc_state->nb_inline_fns; ++i) {
5691 fn = tcc_state->inline_fns[i];
5692 sym = fn->sym;
5693 if (sym && sym->c) {
5694 /* the function was used: generate its code and
5695 convert it to a normal function */
5696 str = fn->token_str;
5697 fn->sym = NULL;
5698 if (file)
5699 pstrcpy(file->filename, sizeof file->filename, fn->filename);
5700 sym->r = VT_SYM | VT_CONST;
5701 sym->type.t &= ~VT_INLINE;
5702
5703 macro_ptr = str;
5704 next();
5705 cur_text_section = text_section;
5706 gen_function(sym);
5707 macro_ptr = NULL; /* fail safe */
5708
5709 inline_generated = 1;
5710 }
5711 }
5712 if (!inline_generated)
5713 break;
5714 }
5715 for (i = 0; i < tcc_state->nb_inline_fns; ++i) {
5716 fn = tcc_state->inline_fns[i];
5717 str = fn->token_str;
5718 tok_str_free(str);
5719 }
5720 dynarray_reset(&tcc_state->inline_fns, &tcc_state->nb_inline_fns);
5721 }
5722
5723 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
5724 static int decl0(int l, int is_for_loop_init)
5725 {
5726 int v, has_init, r;
5727 CType type, btype;
5728 Sym *sym;
5729 AttributeDef ad;
5730
5731 while (1) {
5732 if (!parse_btype(&btype, &ad)) {
5733 if (is_for_loop_init)
5734 return 0;
5735 /* skip redundant ';' */
5736 /* XXX: find more elegant solution */
5737 if (tok == ';') {
5738 next();
5739 continue;
5740 }
5741 if (l == VT_CONST &&
5742 (tok == TOK_ASM1 || tok == TOK_ASM2 || tok == TOK_ASM3)) {
5743 /* global asm block */
5744 asm_global_instr();
5745 continue;
5746 }
5747 /* special test for old K&R protos without explicit int
5748 type. Only accepted when defining global data */
5749 if (l == VT_LOCAL || tok < TOK_DEFINE)
5750 break;
5751 btype.t = VT_INT;
5752 }
5753 if (((btype.t & VT_BTYPE) == VT_ENUM ||
5754 (btype.t & VT_BTYPE) == VT_STRUCT) &&
5755 tok == ';') {
5756 /* we accept no variable after */
5757 next();
5758 continue;
5759 }
5760 while (1) { /* iterate thru each declaration */
5761 char *asm_label; // associated asm label
5762 type = btype;
5763 type_decl(&type, &ad, &v, TYPE_DIRECT);
5764 #if 0
5765 {
5766 char buf[500];
5767 type_to_str(buf, sizeof(buf), t, get_tok_str(v, NULL));
5768 printf("type = '%s'\n", buf);
5769 }
5770 #endif
5771 if ((type.t & VT_BTYPE) == VT_FUNC) {
5772 if ((type.t & VT_STATIC) && (l == VT_LOCAL)) {
5773 tcc_error("function without file scope cannot be static");
5774 }
5775 /* if old style function prototype, we accept a
5776 declaration list */
5777 sym = type.ref;
5778 if (sym->c == FUNC_OLD)
5779 func_decl_list(sym);
5780 }
5781
5782 asm_label = NULL;
5783 if (gnu_ext && (tok == TOK_ASM1 || tok == TOK_ASM2 || tok == TOK_ASM3)) {
5784 CString astr;
5785
5786 asm_label_instr(&astr);
5787 asm_label = tcc_strdup(astr.data);
5788 cstr_free(&astr);
5789
5790 /* parse one last attribute list, after asm label */
5791 parse_attribute(&ad);
5792 }
5793
5794 if (ad.weak)
5795 type.t |= VT_WEAK;
5796 #ifdef TCC_TARGET_PE
5797 if (ad.func_import)
5798 type.t |= VT_IMPORT;
5799 if (ad.func_export)
5800 type.t |= VT_EXPORT;
5801 #endif
5802 if (tok == '{') {
5803 if (l == VT_LOCAL)
5804 tcc_error("cannot use local functions");
5805 if ((type.t & VT_BTYPE) != VT_FUNC)
5806 expect("function definition");
5807
5808 /* reject abstract declarators in function definition */
5809 sym = type.ref;
5810 while ((sym = sym->next) != NULL)
5811 if (!(sym->v & ~SYM_FIELD))
5812 expect("identifier");
5813
5814 /* XXX: cannot do better now: convert extern line to static inline */
5815 if ((type.t & (VT_EXTERN | VT_INLINE)) == (VT_EXTERN | VT_INLINE))
5816 type.t = (type.t & ~VT_EXTERN) | VT_STATIC;
5817
5818 sym = sym_find(v);
5819 if (sym) {
5820 if ((sym->type.t & VT_BTYPE) != VT_FUNC)
5821 goto func_error1;
5822
5823 r = sym->type.ref->r;
5824
5825 if (!FUNC_PROTO(r))
5826 tcc_error("redefinition of '%s'", get_tok_str(v, NULL));
5827
5828 /* use func_call from prototype if not defined */
5829 if (FUNC_CALL(r) != FUNC_CDECL
5830 && FUNC_CALL(type.ref->r) == FUNC_CDECL)
5831 FUNC_CALL(type.ref->r) = FUNC_CALL(r);
5832
5833 /* use export from prototype */
5834 if (FUNC_EXPORT(r))
5835 FUNC_EXPORT(type.ref->r) = 1;
5836
5837 /* use static from prototype */
5838 if (sym->type.t & VT_STATIC)
5839 type.t = (type.t & ~VT_EXTERN) | VT_STATIC;
5840
5841 if (!is_compatible_types(&sym->type, &type)) {
5842 func_error1:
5843 tcc_error("incompatible types for redefinition of '%s'",
5844 get_tok_str(v, NULL));
5845 }
5846 FUNC_PROTO(type.ref->r) = 0;
5847 /* if symbol is already defined, then put complete type */
5848 sym->type = type;
5849 } else {
5850 /* put function symbol */
5851 sym = global_identifier_push(v, type.t, 0);
5852 sym->type.ref = type.ref;
5853 }
5854
5855 /* static inline functions are just recorded as a kind
5856 of macro. Their code will be emitted at the end of
5857 the compilation unit only if they are used */
5858 if ((type.t & (VT_INLINE | VT_STATIC)) ==
5859 (VT_INLINE | VT_STATIC)) {
5860 TokenString func_str;
5861 int block_level;
5862 struct InlineFunc *fn;
5863 const char *filename;
5864
5865 tok_str_new(&func_str);
5866
5867 block_level = 0;
5868 for(;;) {
5869 int t;
5870 if (tok == TOK_EOF)
5871 tcc_error("unexpected end of file");
5872 tok_str_add_tok(&func_str);
5873 t = tok;
5874 next();
5875 if (t == '{') {
5876 block_level++;
5877 } else if (t == '}') {
5878 block_level--;
5879 if (block_level == 0)
5880 break;
5881 }
5882 }
5883 tok_str_add(&func_str, -1);
5884 tok_str_add(&func_str, 0);
5885 filename = file ? file->filename : "";
5886 fn = tcc_malloc(sizeof *fn + strlen(filename));
5887 strcpy(fn->filename, filename);
5888 fn->sym = sym;
5889 fn->token_str = func_str.str;
5890 dynarray_add((void ***)&tcc_state->inline_fns, &tcc_state->nb_inline_fns, fn);
5891
5892 } else {
5893 /* compute text section */
5894 cur_text_section = ad.section;
5895 if (!cur_text_section)
5896 cur_text_section = text_section;
5897 sym->r = VT_SYM | VT_CONST;
5898 gen_function(sym);
5899 }
5900 break;
5901 } else {
5902 if (btype.t & VT_TYPEDEF) {
5903 /* save typedefed type */
5904 /* XXX: test storage specifiers ? */
5905 sym = sym_push(v, &type, INT_ATTR(&ad), 0);
5906 sym->type.t |= VT_TYPEDEF;
5907 } else {
5908 r = 0;
5909 if ((type.t & VT_BTYPE) == VT_FUNC) {
5910 /* external function definition */
5911 /* specific case for func_call attribute */
5912 ad.func_proto = 1;
5913 type.ref->r = INT_ATTR(&ad);
5914 } else if (!(type.t & VT_ARRAY)) {
5915 /* not lvalue if array */
5916 r |= lvalue_type(type.t);
5917 }
5918 has_init = (tok == '=');
5919 if (has_init && (type.t & VT_VLA))
5920 tcc_error("Variable length array cannot be initialized");
5921 if ((btype.t & VT_EXTERN) || ((type.t & VT_BTYPE) == VT_FUNC) ||
5922 ((type.t & VT_ARRAY) && (type.t & VT_STATIC) &&
5923 !has_init && l == VT_CONST && type.ref->c < 0)) {
5924 /* external variable or function */
5925 /* NOTE: as GCC, uninitialized global static
5926 arrays of null size are considered as
5927 extern */
5928 sym = external_sym(v, &type, r, asm_label);
5929
5930 if (type.t & VT_WEAK)
5931 weaken_symbol(sym);
5932
5933 if (ad.alias_target) {
5934 Section tsec;
5935 Elf32_Sym *esym;
5936 Sym *alias_target;
5937
5938 alias_target = sym_find(ad.alias_target);
5939 if (!alias_target || !alias_target->c)
5940 tcc_error("unsupported forward __alias__ attribute");
5941 esym = &((Elf32_Sym *)symtab_section->data)[alias_target->c];
5942 tsec.sh_num = esym->st_shndx;
5943 put_extern_sym2(sym, &tsec, esym->st_value, esym->st_size, 0);
5944 }
5945 } else {
5946 type.t |= (btype.t & VT_STATIC); /* Retain "static". */
5947 if (type.t & VT_STATIC)
5948 r |= VT_CONST;
5949 else
5950 r |= l;
5951 if (has_init)
5952 next();
5953 decl_initializer_alloc(&type, &ad, r, has_init, v, asm_label, l);
5954 }
5955 }
5956 if (tok != ',') {
5957 if (is_for_loop_init)
5958 return 1;
5959 skip(';');
5960 break;
5961 }
5962 next();
5963 }
5964 ad.aligned = 0;
5965 }
5966 }
5967 return 0;
5968 }
5969
5970 ST_FUNC void decl(int l)
5971 {
5972 decl0(l, 0);
5973 }
Tiny C Compiler main repository