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Forbid the use of array of functions
[tinycc.git] / tccgen.c
blob33c42de8b232a49052952c8cd7f64b367b13322c
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 skip('}');
2805 } else {
2806 maxalign = 1;
2807 ps = &s->next;
2808 prevbt = VT_INT;
2809 bit_pos = 0;
2810 offset = 0;
2811 while (tok != '}') {
2812 parse_btype(&btype, &ad);
2813 while (1) {
2814 bit_size = -1;
2815 v = 0;
2816 type1 = btype;
2817 if (tok != ':') {
2818 type_decl(&type1, &ad, &v, TYPE_DIRECT | TYPE_ABSTRACT);
2819 if (v == 0 && (type1.t & VT_BTYPE) != VT_STRUCT)
2820 expect("identifier");
2821 if ((type1.t & VT_BTYPE) == VT_FUNC ||
2822 (type1.t & (VT_TYPEDEF | VT_STATIC | VT_EXTERN | VT_INLINE)))
2823 tcc_error("invalid type for '%s'",
2824 get_tok_str(v, NULL));
2825 }
2826 if (tok == ':') {
2827 next();
2828 bit_size = expr_const();
2829 /* XXX: handle v = 0 case for messages */
2830 if (bit_size < 0)
2831 tcc_error("negative width in bit-field '%s'",
2832 get_tok_str(v, NULL));
2833 if (v && bit_size == 0)
2834 tcc_error("zero width for bit-field '%s'",
2835 get_tok_str(v, NULL));
2836 }
2837 size = type_size(&type1, &align);
2838 if (ad.aligned) {
2839 if (align < ad.aligned)
2840 align = ad.aligned;
2841 } else if (ad.packed) {
2842 align = 1;
2843 } else if (*tcc_state->pack_stack_ptr) {
2844 if (align > *tcc_state->pack_stack_ptr)
2845 align = *tcc_state->pack_stack_ptr;
2846 }
2847 lbit_pos = 0;
2848 if (bit_size >= 0) {
2849 bt = type1.t & VT_BTYPE;
2850 if (bt != VT_INT &&
2851 bt != VT_BYTE &&
2852 bt != VT_SHORT &&
2853 bt != VT_BOOL &&
2854 bt != VT_ENUM &&
2855 bt != VT_LLONG)
2856 tcc_error("bitfields must have scalar type");
2857 bsize = size * 8;
2858 if (bit_size > bsize) {
2859 tcc_error("width of '%s' exceeds its type",
2860 get_tok_str(v, NULL));
2861 } else if (bit_size == bsize) {
2862 /* no need for bit fields */
2863 bit_pos = 0;
2864 } else if (bit_size == 0) {
2865 /* XXX: what to do if only padding in a
2866 structure ? */
2867 /* zero size: means to pad */
2868 bit_pos = 0;
2869 } else {
2870 /* we do not have enough room ?
2871 did the type change?
2872 is it a union? */
2873 if ((bit_pos + bit_size) > bsize ||
2874 bt != prevbt || a == TOK_UNION)
2875 bit_pos = 0;
2876 lbit_pos = bit_pos;
2877 /* XXX: handle LSB first */
2878 type1.t |= VT_BITFIELD |
2879 (bit_pos << VT_STRUCT_SHIFT) |
2880 (bit_size << (VT_STRUCT_SHIFT + 6));
2881 bit_pos += bit_size;
2882 }
2883 prevbt = bt;
2884 } else {
2885 bit_pos = 0;
2886 }
2887 if (v != 0 || (type1.t & VT_BTYPE) == VT_STRUCT) {
2888 /* add new memory data only if starting
2889 bit field */
2890 if (lbit_pos == 0) {
2891 if (a == TOK_STRUCT) {
2892 c = (c + align - 1) & -align;
2893 offset = c;
2894 if (size > 0)
2895 c += size;
2896 } else {
2897 offset = 0;
2898 if (size > c)
2899 c = size;
2900 }
2901 if (align > maxalign)
2902 maxalign = align;
2903 }
2904 #if 0
2905 printf("add field %s offset=%d",
2906 get_tok_str(v, NULL), offset);
2907 if (type1.t & VT_BITFIELD) {
2908 printf(" pos=%d size=%d",
2909 (type1.t >> VT_STRUCT_SHIFT) & 0x3f,
2910 (type1.t >> (VT_STRUCT_SHIFT + 6)) & 0x3f);
2911 }
2912 printf("\n");
2913 #endif
2914 }
2915 if (v == 0 && (type1.t & VT_BTYPE) == VT_STRUCT) {
2916 ass = type1.ref;
2917 while ((ass = ass->next) != NULL) {
2918 ss = sym_push(ass->v, &ass->type, 0, offset + ass->c);
2919 *ps = ss;
2920 ps = &ss->next;
2921 }
2922 } else if (v) {
2923 ss = sym_push(v | SYM_FIELD, &type1, 0, offset);
2924 *ps = ss;
2925 ps = &ss->next;
2926 }
2927 if (tok == ';' || tok == TOK_EOF)
2928 break;
2929 skip(',');
2930 }
2931 skip(';');
2932 }
2933 skip('}');
2934 /* store size and alignment */
2935 s->c = (c + maxalign - 1) & -maxalign;
2936 s->r = maxalign;
2937 }
2938 }
2939 }
2940
2941 /* return 0 if no type declaration. otherwise, return the basic type
2942 and skip it.
2943 */
2944 static int parse_btype(CType *type, AttributeDef *ad)
2945 {
2946 int t, u, type_found, typespec_found, typedef_found;
2947 Sym *s;
2948 CType type1;
2949
2950 memset(ad, 0, sizeof(AttributeDef));
2951 type_found = 0;
2952 typespec_found = 0;
2953 typedef_found = 0;
2954 t = 0;
2955 while(1) {
2956 switch(tok) {
2957 case TOK_EXTENSION:
2958 /* currently, we really ignore extension */
2959 next();
2960 continue;
2961
2962 /* basic types */
2963 case TOK_CHAR:
2964 u = VT_BYTE;
2965 basic_type:
2966 next();
2967 basic_type1:
2968 if ((t & VT_BTYPE) != 0)
2969 tcc_error("too many basic types");
2970 t |= u;
2971 typespec_found = 1;
2972 break;
2973 case TOK_VOID:
2974 u = VT_VOID;
2975 goto basic_type;
2976 case TOK_SHORT:
2977 u = VT_SHORT;
2978 goto basic_type;
2979 case TOK_INT:
2980 next();
2981 typespec_found = 1;
2982 break;
2983 case TOK_LONG:
2984 next();
2985 if ((t & VT_BTYPE) == VT_DOUBLE) {
2986 #ifndef TCC_TARGET_PE
2987 t = (t & ~VT_BTYPE) | VT_LDOUBLE;
2988 #endif
2989 } else if ((t & VT_BTYPE) == VT_LONG) {
2990 t = (t & ~VT_BTYPE) | VT_LLONG;
2991 } else {
2992 u = VT_LONG;
2993 goto basic_type1;
2994 }
2995 break;
2996 case TOK_BOOL:
2997 u = VT_BOOL;
2998 goto basic_type;
2999 case TOK_FLOAT:
3000 u = VT_FLOAT;
3001 goto basic_type;
3002 case TOK_DOUBLE:
3003 next();
3004 if ((t & VT_BTYPE) == VT_LONG) {
3005 #ifdef TCC_TARGET_PE
3006 t = (t & ~VT_BTYPE) | VT_DOUBLE;
3007 #else
3008 t = (t & ~VT_BTYPE) | VT_LDOUBLE;
3009 #endif
3010 } else {
3011 u = VT_DOUBLE;
3012 goto basic_type1;
3013 }
3014 break;
3015 case TOK_ENUM:
3016 struct_decl(&type1, VT_ENUM);
3017 basic_type2:
3018 u = type1.t;
3019 type->ref = type1.ref;
3020 goto basic_type1;
3021 case TOK_STRUCT:
3022 case TOK_UNION:
3023 struct_decl(&type1, VT_STRUCT);
3024 goto basic_type2;
3025
3026 /* type modifiers */
3027 case TOK_CONST1:
3028 case TOK_CONST2:
3029 case TOK_CONST3:
3030 t |= VT_CONSTANT;
3031 next();
3032 break;
3033 case TOK_VOLATILE1:
3034 case TOK_VOLATILE2:
3035 case TOK_VOLATILE3:
3036 t |= VT_VOLATILE;
3037 next();
3038 break;
3039 case TOK_SIGNED1:
3040 case TOK_SIGNED2:
3041 case TOK_SIGNED3:
3042 typespec_found = 1;
3043 t |= VT_SIGNED;
3044 next();
3045 break;
3046 case TOK_REGISTER:
3047 case TOK_AUTO:
3048 case TOK_RESTRICT1:
3049 case TOK_RESTRICT2:
3050 case TOK_RESTRICT3:
3051 next();
3052 break;
3053 case TOK_UNSIGNED:
3054 t |= VT_UNSIGNED;
3055 next();
3056 typespec_found = 1;
3057 break;
3058
3059 /* storage */
3060 case TOK_EXTERN:
3061 t |= VT_EXTERN;
3062 next();
3063 break;
3064 case TOK_STATIC:
3065 t |= VT_STATIC;
3066 next();
3067 break;
3068 case TOK_TYPEDEF:
3069 t |= VT_TYPEDEF;
3070 next();
3071 break;
3072 case TOK_INLINE1:
3073 case TOK_INLINE2:
3074 case TOK_INLINE3:
3075 t |= VT_INLINE;
3076 next();
3077 break;
3078
3079 /* GNUC attribute */
3080 case TOK_ATTRIBUTE1:
3081 case TOK_ATTRIBUTE2:
3082 parse_attribute(ad);
3083 if (ad->mode) {
3084 u = ad->mode -1;
3085 t = (t & ~VT_BTYPE) | u;
3086 }
3087 break;
3088 /* GNUC typeof */
3089 case TOK_TYPEOF1:
3090 case TOK_TYPEOF2:
3091 case TOK_TYPEOF3:
3092 next();
3093 parse_expr_type(&type1);
3094 /* remove all storage modifiers except typedef */
3095 type1.t &= ~(VT_STORAGE&~VT_TYPEDEF);
3096 goto basic_type2;
3097 default:
3098 if (typespec_found || typedef_found)
3099 goto the_end;
3100 s = sym_find(tok);
3101 if (!s || !(s->type.t & VT_TYPEDEF))
3102 goto the_end;
3103 typedef_found = 1;
3104 t |= (s->type.t & ~VT_TYPEDEF);
3105 type->ref = s->type.ref;
3106 if (s->r) {
3107 /* get attributes from typedef */
3108 if (0 == ad->aligned)
3109 ad->aligned = FUNC_ALIGN(s->r);
3110 if (0 == ad->func_call)
3111 ad->func_call = FUNC_CALL(s->r);
3112 ad->packed |= FUNC_PACKED(s->r);
3113 }
3114 next();
3115 typespec_found = 1;
3116 break;
3117 }
3118 type_found = 1;
3119 }
3120 the_end:
3121 if ((t & (VT_SIGNED|VT_UNSIGNED)) == (VT_SIGNED|VT_UNSIGNED))
3122 tcc_error("signed and unsigned modifier");
3123 if (tcc_state->char_is_unsigned) {
3124 if ((t & (VT_SIGNED|VT_UNSIGNED|VT_BTYPE)) == VT_BYTE)
3125 t |= VT_UNSIGNED;
3126 }
3127 t &= ~VT_SIGNED;
3128
3129 /* long is never used as type */
3130 if ((t & VT_BTYPE) == VT_LONG)
3131 #if !defined TCC_TARGET_X86_64 || defined TCC_TARGET_PE
3132 t = (t & ~VT_BTYPE) | VT_INT;
3133 #else
3134 t = (t & ~VT_BTYPE) | VT_LLONG;
3135 #endif
3136 type->t = t;
3137 return type_found;
3138 }
3139
3140 /* convert a function parameter type (array to pointer and function to
3141 function pointer) */
3142 static inline void convert_parameter_type(CType *pt)
3143 {
3144 /* remove const and volatile qualifiers (XXX: const could be used
3145 to indicate a const function parameter */
3146 pt->t &= ~(VT_CONSTANT | VT_VOLATILE);
3147 /* array must be transformed to pointer according to ANSI C */
3148 pt->t &= ~VT_ARRAY;
3149 if ((pt->t & VT_BTYPE) == VT_FUNC) {
3150 mk_pointer(pt);
3151 }
3152 }
3153
3154 ST_FUNC void parse_asm_str(CString *astr)
3155 {
3156 skip('(');
3157 /* read the string */
3158 if (tok != TOK_STR)
3159 expect("string constant");
3160 cstr_new(astr);
3161 while (tok == TOK_STR) {
3162 /* XXX: add \0 handling too ? */
3163 cstr_cat(astr, tokc.cstr->data);
3164 next();
3165 }
3166 cstr_ccat(astr, '\0');
3167 }
3168
3169 /* Parse an asm label and return the label
3170 * Don't forget to free the CString in the caller! */
3171 static void asm_label_instr(CString *astr)
3172 {
3173 next();
3174 parse_asm_str(astr);
3175 skip(')');
3176 #ifdef ASM_DEBUG
3177 printf("asm_alias: \"%s\"\n", (char *)astr->data);
3178 #endif
3179 }
3180
3181 static void post_type(CType *type, AttributeDef *ad)
3182 {
3183 int n, l, t1, arg_size, align;
3184 Sym **plast, *s, *first;
3185 AttributeDef ad1;
3186 CType pt;
3187
3188 if (tok == '(') {
3189 /* function declaration */
3190 next();
3191 l = 0;
3192 first = NULL;
3193 plast = &first;
3194 arg_size = 0;
3195 if (tok != ')') {
3196 for(;;) {
3197 /* read param name and compute offset */
3198 if (l != FUNC_OLD) {
3199 if (!parse_btype(&pt, &ad1)) {
3200 if (l) {
3201 tcc_error("invalid type");
3202 } else {
3203 l = FUNC_OLD;
3204 goto old_proto;
3205 }
3206 }
3207 l = FUNC_NEW;
3208 if ((pt.t & VT_BTYPE) == VT_VOID && tok == ')')
3209 break;
3210 type_decl(&pt, &ad1, &n, TYPE_DIRECT | TYPE_ABSTRACT);
3211 if ((pt.t & VT_BTYPE) == VT_VOID)
3212 tcc_error("parameter declared as void");
3213 arg_size += (type_size(&pt, &align) + PTR_SIZE - 1) / PTR_SIZE;
3214 } else {
3215 old_proto:
3216 n = tok;
3217 if (n < TOK_UIDENT)
3218 expect("identifier");
3219 pt.t = VT_INT;
3220 next();
3221 }
3222 convert_parameter_type(&pt);
3223 s = sym_push(n | SYM_FIELD, &pt, 0, 0);
3224 *plast = s;
3225 plast = &s->next;
3226 if (tok == ')')
3227 break;
3228 skip(',');
3229 if (l == FUNC_NEW && tok == TOK_DOTS) {
3230 l = FUNC_ELLIPSIS;
3231 next();
3232 break;
3233 }
3234 }
3235 }
3236 /* if no parameters, then old type prototype */
3237 if (l == 0)
3238 l = FUNC_OLD;
3239 skip(')');
3240 /* NOTE: const is ignored in returned type as it has a special
3241 meaning in gcc / C++ */
3242 type->t &= ~VT_CONSTANT;
3243 /* some ancient pre-K&R C allows a function to return an array
3244 and the array brackets to be put after the arguments, such
3245 that "int c()[]" means something like "int[] c()" */
3246 if (tok == '[') {
3247 next();
3248 skip(']'); /* only handle simple "[]" */
3249 type->t |= VT_PTR;
3250 }
3251 /* we push a anonymous symbol which will contain the function prototype */
3252 ad->func_args = arg_size;
3253 s = sym_push(SYM_FIELD, type, INT_ATTR(ad), l);
3254 s->next = first;
3255 type->t = VT_FUNC;
3256 type->ref = s;
3257 } else if (tok == '[') {
3258 /* array definition */
3259 next();
3260 if (tok == TOK_RESTRICT1)
3261 next();
3262 n = -1;
3263 t1 = 0;
3264 if (tok != ']') {
3265 if (!local_stack || nocode_wanted)
3266 vpushi(expr_const());
3267 else gexpr();
3268 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
3269 n = vtop->c.i;
3270 if (n < 0)
3271 tcc_error("invalid array size");
3272 } else {
3273 if (!is_integer_btype(vtop->type.t & VT_BTYPE))
3274 tcc_error("size of variable length array should be an integer");
3275 t1 = VT_VLA;
3276 }
3277 }
3278 skip(']');
3279 /* parse next post type */
3280 post_type(type, ad);
3281 if (type->t == VT_FUNC)
3282 tcc_error("declaration of an array of functions");
3283 t1 |= type->t & VT_VLA;
3284
3285 if (t1 & VT_VLA) {
3286 loc -= type_size(&int_type, &align);
3287 loc &= -align;
3288 n = loc;
3289
3290 vla_runtime_type_size(type, &align);
3291 gen_op('*');
3292 vset(&int_type, VT_LOCAL|VT_LVAL, loc);
3293 vswap();
3294 vstore();
3295 }
3296 if (n != -1)
3297 vpop();
3298
3299 /* we push an anonymous symbol which will contain the array
3300 element type */
3301 s = sym_push(SYM_FIELD, type, 0, n);
3302 type->t = (t1 ? VT_VLA : VT_ARRAY) | VT_PTR;
3303 type->ref = s;
3304 }
3305 }
3306
3307 /* Parse a type declaration (except basic type), and return the type
3308 in 'type'. 'td' is a bitmask indicating which kind of type decl is
3309 expected. 'type' should contain the basic type. 'ad' is the
3310 attribute definition of the basic type. It can be modified by
3311 type_decl().
3312 */
3313 static void type_decl(CType *type, AttributeDef *ad, int *v, int td)
3314 {
3315 Sym *s;
3316 CType type1, *type2;
3317 int qualifiers, storage;
3318
3319 while (tok == '*') {
3320 qualifiers = 0;
3321 redo:
3322 next();
3323 switch(tok) {
3324 case TOK_CONST1:
3325 case TOK_CONST2:
3326 case TOK_CONST3:
3327 qualifiers |= VT_CONSTANT;
3328 goto redo;
3329 case TOK_VOLATILE1:
3330 case TOK_VOLATILE2:
3331 case TOK_VOLATILE3:
3332 qualifiers |= VT_VOLATILE;
3333 goto redo;
3334 case TOK_RESTRICT1:
3335 case TOK_RESTRICT2:
3336 case TOK_RESTRICT3:
3337 goto redo;
3338 }
3339 mk_pointer(type);
3340 type->t |= qualifiers;
3341 }
3342
3343 /* XXX: clarify attribute handling */
3344 if (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2)
3345 parse_attribute(ad);
3346
3347 /* recursive type */
3348 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
3349 type1.t = 0; /* XXX: same as int */
3350 if (tok == '(') {
3351 next();
3352 /* XXX: this is not correct to modify 'ad' at this point, but
3353 the syntax is not clear */
3354 if (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2)
3355 parse_attribute(ad);
3356 type_decl(&type1, ad, v, td);
3357 skip(')');
3358 } else {
3359 /* type identifier */
3360 if (tok >= TOK_IDENT && (td & TYPE_DIRECT)) {
3361 *v = tok;
3362 next();
3363 } else {
3364 if (!(td & TYPE_ABSTRACT))
3365 expect("identifier");
3366 *v = 0;
3367 }
3368 }
3369 storage = type->t & VT_STORAGE;
3370 type->t &= ~VT_STORAGE;
3371 if (storage & VT_STATIC) {
3372 int saved_nocode_wanted = nocode_wanted;
3373 nocode_wanted = 1;
3374 post_type(type, ad);
3375 nocode_wanted = saved_nocode_wanted;
3376 } else
3377 post_type(type, ad);
3378 type->t |= storage;
3379 if (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2)
3380 parse_attribute(ad);
3381
3382 if (!type1.t)
3383 return;
3384 /* append type at the end of type1 */
3385 type2 = &type1;
3386 for(;;) {
3387 s = type2->ref;
3388 type2 = &s->type;
3389 if (!type2->t) {
3390 *type2 = *type;
3391 break;
3392 }
3393 }
3394 *type = type1;
3395 }
3396
3397 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
3398 ST_FUNC int lvalue_type(int t)
3399 {
3400 int bt, r;
3401 r = VT_LVAL;
3402 bt = t & VT_BTYPE;
3403 if (bt == VT_BYTE || bt == VT_BOOL)
3404 r |= VT_LVAL_BYTE;
3405 else if (bt == VT_SHORT)
3406 r |= VT_LVAL_SHORT;
3407 else
3408 return r;
3409 if (t & VT_UNSIGNED)
3410 r |= VT_LVAL_UNSIGNED;
3411 return r;
3412 }
3413
3414 /* indirection with full error checking and bound check */
3415 ST_FUNC void indir(void)
3416 {
3417 if ((vtop->type.t & VT_BTYPE) != VT_PTR) {
3418 if ((vtop->type.t & VT_BTYPE) == VT_FUNC)
3419 return;
3420 expect("pointer");
3421 }
3422 if ((vtop->r & VT_LVAL) && !nocode_wanted)
3423 gv(RC_INT);
3424 vtop->type = *pointed_type(&vtop->type);
3425 /* Arrays and functions are never lvalues */
3426 if (!(vtop->type.t & VT_ARRAY) && !(vtop->type.t & VT_VLA)
3427 && (vtop->type.t & VT_BTYPE) != VT_FUNC) {
3428 vtop->r |= lvalue_type(vtop->type.t);
3429 /* if bound checking, the referenced pointer must be checked */
3430 #ifdef CONFIG_TCC_BCHECK
3431 if (tcc_state->do_bounds_check)
3432 vtop->r |= VT_MUSTBOUND;
3433 #endif
3434 }
3435 }
3436
3437 /* pass a parameter to a function and do type checking and casting */
3438 static void gfunc_param_typed(Sym *func, Sym *arg)
3439 {
3440 int func_type;
3441 CType type;
3442
3443 func_type = func->c;
3444 if (func_type == FUNC_OLD ||
3445 (func_type == FUNC_ELLIPSIS && arg == NULL)) {
3446 /* default casting : only need to convert float to double */
3447 if ((vtop->type.t & VT_BTYPE) == VT_FLOAT) {
3448 type.t = VT_DOUBLE;
3449 gen_cast(&type);
3450 }
3451 } else if (arg == NULL) {
3452 tcc_error("too many arguments to function");
3453 } else {
3454 type = arg->type;
3455 type.t &= ~VT_CONSTANT; /* need to do that to avoid false warning */
3456 gen_assign_cast(&type);
3457 }
3458 }
3459
3460 /* parse an expression of the form '(type)' or '(expr)' and return its
3461 type */
3462 static void parse_expr_type(CType *type)
3463 {
3464 int n;
3465 AttributeDef ad;
3466
3467 skip('(');
3468 if (parse_btype(type, &ad)) {
3469 type_decl(type, &ad, &n, TYPE_ABSTRACT);
3470 } else {
3471 expr_type(type);
3472 }
3473 skip(')');
3474 }
3475
3476 static void parse_type(CType *type)
3477 {
3478 AttributeDef ad;
3479 int n;
3480
3481 if (!parse_btype(type, &ad)) {
3482 expect("type");
3483 }
3484 type_decl(type, &ad, &n, TYPE_ABSTRACT);
3485 }
3486
3487 static void vpush_tokc(int t)
3488 {
3489 CType type;
3490 type.t = t;
3491 type.ref = 0;
3492 vsetc(&type, VT_CONST, &tokc);
3493 }
3494
3495 ST_FUNC void unary(void)
3496 {
3497 int n, t, align, size, r, sizeof_caller;
3498 CType type;
3499 Sym *s;
3500 AttributeDef ad;
3501 static int in_sizeof = 0;
3502
3503 sizeof_caller = in_sizeof;
3504 in_sizeof = 0;
3505 /* XXX: GCC 2.95.3 does not generate a table although it should be
3506 better here */
3507 tok_next:
3508 switch(tok) {
3509 case TOK_EXTENSION:
3510 next();
3511 goto tok_next;
3512 case TOK_CINT:
3513 case TOK_CCHAR:
3514 case TOK_LCHAR:
3515 vpushi(tokc.i);
3516 next();
3517 break;
3518 case TOK_CUINT:
3519 vpush_tokc(VT_INT | VT_UNSIGNED);
3520 next();
3521 break;
3522 case TOK_CLLONG:
3523 vpush_tokc(VT_LLONG);
3524 next();
3525 break;
3526 case TOK_CULLONG:
3527 vpush_tokc(VT_LLONG | VT_UNSIGNED);
3528 next();
3529 break;
3530 case TOK_CFLOAT:
3531 vpush_tokc(VT_FLOAT);
3532 next();
3533 break;
3534 case TOK_CDOUBLE:
3535 vpush_tokc(VT_DOUBLE);
3536 next();
3537 break;
3538 case TOK_CLDOUBLE:
3539 vpush_tokc(VT_LDOUBLE);
3540 next();
3541 break;
3542 case TOK___FUNCTION__:
3543 if (!gnu_ext)
3544 goto tok_identifier;
3545 /* fall thru */
3546 case TOK___FUNC__:
3547 {
3548 void *ptr;
3549 int len;
3550 /* special function name identifier */
3551 len = strlen(funcname) + 1;
3552 /* generate char[len] type */
3553 type.t = VT_BYTE;
3554 mk_pointer(&type);
3555 type.t |= VT_ARRAY;
3556 type.ref->c = len;
3557 vpush_ref(&type, data_section, data_section->data_offset, len);
3558 ptr = section_ptr_add(data_section, len);
3559 memcpy(ptr, funcname, len);
3560 next();
3561 }
3562 break;
3563 case TOK_LSTR:
3564 #ifdef TCC_TARGET_PE
3565 t = VT_SHORT | VT_UNSIGNED;
3566 #else
3567 t = VT_INT;
3568 #endif
3569 goto str_init;
3570 case TOK_STR:
3571 /* string parsing */
3572 t = VT_BYTE;
3573 str_init:
3574 if (tcc_state->warn_write_strings)
3575 t |= VT_CONSTANT;
3576 type.t = t;
3577 mk_pointer(&type);
3578 type.t |= VT_ARRAY;
3579 memset(&ad, 0, sizeof(AttributeDef));
3580 decl_initializer_alloc(&type, &ad, VT_CONST, 2, 0, NULL, 0);
3581 break;
3582 case '(':
3583 next();
3584 /* cast ? */
3585 if (parse_btype(&type, &ad)) {
3586 type_decl(&type, &ad, &n, TYPE_ABSTRACT);
3587 skip(')');
3588 /* check ISOC99 compound literal */
3589 if (tok == '{') {
3590 /* data is allocated locally by default */
3591 if (global_expr)
3592 r = VT_CONST;
3593 else
3594 r = VT_LOCAL;
3595 /* all except arrays are lvalues */
3596 if (!(type.t & VT_ARRAY))
3597 r |= lvalue_type(type.t);
3598 memset(&ad, 0, sizeof(AttributeDef));
3599 decl_initializer_alloc(&type, &ad, r, 1, 0, NULL, 0);
3600 } else {
3601 if (sizeof_caller) {
3602 vpush(&type);
3603 return;
3604 }
3605 unary();
3606 gen_cast(&type);
3607 }
3608 } else if (tok == '{') {
3609 /* save all registers */
3610 save_regs(0);
3611 /* statement expression : we do not accept break/continue
3612 inside as GCC does */
3613 block(NULL, NULL, NULL, NULL, 0, 1);
3614 skip(')');
3615 } else {
3616 gexpr();
3617 skip(')');
3618 }
3619 break;
3620 case '*':
3621 next();
3622 unary();
3623 indir();
3624 break;
3625 case '&':
3626 next();
3627 unary();
3628 /* functions names must be treated as function pointers,
3629 except for unary '&' and sizeof. Since we consider that
3630 functions are not lvalues, we only have to handle it
3631 there and in function calls. */
3632 /* arrays can also be used although they are not lvalues */
3633 if ((vtop->type.t & VT_BTYPE) != VT_FUNC &&
3634 !(vtop->type.t & VT_ARRAY) && !(vtop->type.t & VT_LLOCAL))
3635 test_lvalue();
3636 mk_pointer(&vtop->type);
3637 gaddrof();
3638 break;
3639 case '!':
3640 next();
3641 unary();
3642 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
3643 CType boolean;
3644 boolean.t = VT_BOOL;
3645 gen_cast(&boolean);
3646 vtop->c.i = !vtop->c.i;
3647 } else if ((vtop->r & VT_VALMASK) == VT_CMP)
3648 vtop->c.i = vtop->c.i ^ 1;
3649 else {
3650 save_regs(1);
3651 vseti(VT_JMP, gtst(1, 0));
3652 }
3653 break;
3654 case '~':
3655 next();
3656 unary();
3657 vpushi(-1);
3658 gen_op('^');
3659 break;
3660 case '+':
3661 next();
3662 /* in order to force cast, we add zero */
3663 unary();
3664 if ((vtop->type.t & VT_BTYPE) == VT_PTR)
3665 tcc_error("pointer not accepted for unary plus");
3666 vpushi(0);
3667 gen_op('+');
3668 break;
3669 case TOK_SIZEOF:
3670 case TOK_ALIGNOF1:
3671 case TOK_ALIGNOF2:
3672 t = tok;
3673 next();
3674 in_sizeof++;
3675 unary_type(&type); // Perform a in_sizeof = 0;
3676 size = type_size(&type, &align);
3677 if (t == TOK_SIZEOF) {
3678 if (!(type.t & VT_VLA)) {
3679 if (size < 0)
3680 tcc_error("sizeof applied to an incomplete type");
3681 vpushs(size);
3682 } else {
3683 vla_runtime_type_size(&type, &align);
3684 }
3685 } else {
3686 vpushs(align);
3687 }
3688 vtop->type.t |= VT_UNSIGNED;
3689 break;
3690
3691 case TOK_builtin_types_compatible_p:
3692 {
3693 CType type1, type2;
3694 next();
3695 skip('(');
3696 parse_type(&type1);
3697 skip(',');
3698 parse_type(&type2);
3699 skip(')');
3700 type1.t &= ~(VT_CONSTANT | VT_VOLATILE);
3701 type2.t &= ~(VT_CONSTANT | VT_VOLATILE);
3702 vpushi(is_compatible_types(&type1, &type2));
3703 }
3704 break;
3705 case TOK_builtin_constant_p:
3706 {
3707 int saved_nocode_wanted, res;
3708 next();
3709 skip('(');
3710 saved_nocode_wanted = nocode_wanted;
3711 nocode_wanted = 1;
3712 gexpr();
3713 res = (vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
3714 vpop();
3715 nocode_wanted = saved_nocode_wanted;
3716 skip(')');
3717 vpushi(res);
3718 }
3719 break;
3720 case TOK_builtin_frame_address:
3721 {
3722 int level;
3723 CType type;
3724 next();
3725 skip('(');
3726 if (tok != TOK_CINT || tokc.i < 0) {
3727 tcc_error("__builtin_frame_address only takes positive integers");
3728 }
3729 level = tokc.i;
3730 next();
3731 skip(')');
3732 type.t = VT_VOID;
3733 mk_pointer(&type);
3734 vset(&type, VT_LOCAL, 0); /* local frame */
3735 while (level--) {
3736 mk_pointer(&vtop->type);
3737 indir(); /* -> parent frame */
3738 }
3739 }
3740 break;
3741 #ifdef TCC_TARGET_X86_64
3742 #ifdef TCC_TARGET_PE
3743 case TOK_builtin_va_start:
3744 {
3745 next();
3746 skip('(');
3747 expr_eq();
3748 skip(',');
3749 expr_eq();
3750 skip(')');
3751 if ((vtop->r & VT_VALMASK) != VT_LOCAL)
3752 tcc_error("__builtin_va_start expects a local variable");
3753 vtop->r &= ~(VT_LVAL | VT_REF);
3754 vtop->type = char_pointer_type;
3755 vstore();
3756 }
3757 break;
3758 #else
3759 case TOK_builtin_va_arg_types:
3760 {
3761 CType type;
3762 int bt;
3763 next();
3764 skip('(');
3765 parse_type(&type);
3766 skip(')');
3767 vpushi(classify_x86_64_va_arg(&type));
3768 }
3769 break;
3770 #endif
3771 #endif
3772 case TOK_INC:
3773 case TOK_DEC:
3774 t = tok;
3775 next();
3776 unary();
3777 inc(0, t);
3778 break;
3779 case '-':
3780 next();
3781 vpushi(0);
3782 unary();
3783 gen_op('-');
3784 break;
3785 case TOK_LAND:
3786 if (!gnu_ext)
3787 goto tok_identifier;
3788 next();
3789 /* allow to take the address of a label */
3790 if (tok < TOK_UIDENT)
3791 expect("label identifier");
3792 s = label_find(tok);
3793 if (!s) {
3794 s = label_push(&global_label_stack, tok, LABEL_FORWARD);
3795 } else {
3796 if (s->r == LABEL_DECLARED)
3797 s->r = LABEL_FORWARD;
3798 }
3799 if (!s->type.t) {
3800 s->type.t = VT_VOID;
3801 mk_pointer(&s->type);
3802 s->type.t |= VT_STATIC;
3803 }
3804 vset(&s->type, VT_CONST | VT_SYM, 0);
3805 vtop->sym = s;
3806 next();
3807 break;
3808
3809 // special qnan , snan and infinity values
3810 case TOK___NAN__:
3811 vpush64(VT_DOUBLE, 0x7ff8000000000000ULL);
3812 next();
3813 break;
3814 case TOK___SNAN__:
3815 vpush64(VT_DOUBLE, 0x7ff0000000000001ULL);
3816 next();
3817 break;
3818 case TOK___INF__:
3819 vpush64(VT_DOUBLE, 0x7ff0000000000000ULL);
3820 next();
3821 break;
3822
3823 default:
3824 tok_identifier:
3825 t = tok;
3826 next();
3827 if (t < TOK_UIDENT)
3828 expect("identifier");
3829 s = sym_find(t);
3830 if (!s) {
3831 if (tok != '(')
3832 tcc_error("'%s' undeclared", get_tok_str(t, NULL));
3833 /* for simple function calls, we tolerate undeclared
3834 external reference to int() function */
3835 if (tcc_state->warn_implicit_function_declaration)
3836 tcc_warning("implicit declaration of function '%s'",
3837 get_tok_str(t, NULL));
3838 s = external_global_sym(t, &func_old_type, 0);
3839 }
3840 if ((s->type.t & (VT_STATIC | VT_INLINE | VT_BTYPE)) ==
3841 (VT_STATIC | VT_INLINE | VT_FUNC)) {
3842 /* if referencing an inline function, then we generate a
3843 symbol to it if not already done. It will have the
3844 effect to generate code for it at the end of the
3845 compilation unit. Inline function as always
3846 generated in the text section. */
3847 if (!s->c)
3848 put_extern_sym(s, text_section, 0, 0);
3849 r = VT_SYM | VT_CONST;
3850 } else {
3851 r = s->r;
3852 }
3853 vset(&s->type, r, s->c);
3854 /* if forward reference, we must point to s */
3855 if (vtop->r & VT_SYM) {
3856 vtop->sym = s;
3857 vtop->c.ul = 0;
3858 }
3859 break;
3860 }
3861
3862 /* post operations */
3863 while (1) {
3864 if (tok == TOK_INC || tok == TOK_DEC) {
3865 inc(1, tok);
3866 next();
3867 } else if (tok == '.' || tok == TOK_ARROW) {
3868 int qualifiers;
3869 /* field */
3870 if (tok == TOK_ARROW)
3871 indir();
3872 qualifiers = vtop->type.t & (VT_CONSTANT | VT_VOLATILE);
3873 test_lvalue();
3874 gaddrof();
3875 next();
3876 /* expect pointer on structure */
3877 if ((vtop->type.t & VT_BTYPE) != VT_STRUCT)
3878 expect("struct or union");
3879 s = vtop->type.ref;
3880 /* find field */
3881 tok |= SYM_FIELD;
3882 while ((s = s->next) != NULL) {
3883 if (s->v == tok)
3884 break;
3885 }
3886 if (!s)
3887 tcc_error("field not found: %s", get_tok_str(tok & ~SYM_FIELD, NULL));
3888 /* add field offset to pointer */
3889 vtop->type = char_pointer_type; /* change type to 'char *' */
3890 vpushi(s->c);
3891 gen_op('+');
3892 /* change type to field type, and set to lvalue */
3893 vtop->type = s->type;
3894 vtop->type.t |= qualifiers;
3895 /* an array is never an lvalue */
3896 if (!(vtop->type.t & VT_ARRAY)) {
3897 vtop->r |= lvalue_type(vtop->type.t);
3898 #ifdef CONFIG_TCC_BCHECK
3899 /* if bound checking, the referenced pointer must be checked */
3900 if (tcc_state->do_bounds_check)
3901 vtop->r |= VT_MUSTBOUND;
3902 #endif
3903 }
3904 next();
3905 } else if (tok == '[') {
3906 next();
3907 gexpr();
3908 gen_op('+');
3909 indir();
3910 skip(']');
3911 } else if (tok == '(') {
3912 SValue ret;
3913 Sym *sa;
3914 int nb_args, sret;
3915
3916 /* function call */
3917 if ((vtop->type.t & VT_BTYPE) != VT_FUNC) {
3918 /* pointer test (no array accepted) */
3919 if ((vtop->type.t & (VT_BTYPE | VT_ARRAY)) == VT_PTR) {
3920 vtop->type = *pointed_type(&vtop->type);
3921 if ((vtop->type.t & VT_BTYPE) != VT_FUNC)
3922 goto error_func;
3923 } else {
3924 error_func:
3925 expect("function pointer");
3926 }
3927 } else {
3928 vtop->r &= ~VT_LVAL; /* no lvalue */
3929 }
3930 /* get return type */
3931 s = vtop->type.ref;
3932 next();
3933 sa = s->next; /* first parameter */
3934 nb_args = 0;
3935 ret.r2 = VT_CONST;
3936 /* compute first implicit argument if a structure is returned */
3937 if ((s->type.t & VT_BTYPE) == VT_STRUCT) {
3938 int ret_align;
3939 sret = gfunc_sret(&s->type, &ret.type, &ret_align);
3940 if (sret) {
3941 /* get some space for the returned structure */
3942 size = type_size(&s->type, &align);
3943 loc = (loc - size) & -align;
3944 ret.type = s->type;
3945 ret.r = VT_LOCAL | VT_LVAL;
3946 /* pass it as 'int' to avoid structure arg passing
3947 problems */
3948 vseti(VT_LOCAL, loc);
3949 ret.c = vtop->c;
3950 nb_args++;
3951 }
3952 } else {
3953 sret = 0;
3954 ret.type = s->type;
3955 }
3956
3957 if (!sret) {
3958 /* return in register */
3959 if (is_float(ret.type.t)) {
3960 ret.r = reg_fret(ret.type.t);
3961 #ifdef TCC_TARGET_X86_64
3962 if ((ret.type.t & VT_BTYPE) == VT_QFLOAT)
3963 ret.r2 = REG_QRET;
3964 #endif
3965 } else {
3966 #ifdef TCC_TARGET_X86_64
3967 if ((ret.type.t & VT_BTYPE) == VT_QLONG)
3968 #else
3969 if ((ret.type.t & VT_BTYPE) == VT_LLONG)
3970 #endif
3971 ret.r2 = REG_LRET;
3972 ret.r = REG_IRET;
3973 }
3974 ret.c.i = 0;
3975 }
3976 if (tok != ')') {
3977 for(;;) {
3978 expr_eq();
3979 gfunc_param_typed(s, sa);
3980 nb_args++;
3981 if (sa)
3982 sa = sa->next;
3983 if (tok == ')')
3984 break;
3985 skip(',');
3986 }
3987 }
3988 if (sa)
3989 tcc_error("too few arguments to function");
3990 skip(')');
3991 if (!nocode_wanted) {
3992 gfunc_call(nb_args);
3993 } else {
3994 vtop -= (nb_args + 1);
3995 }
3996 /* return value */
3997 vsetc(&ret.type, ret.r, &ret.c);
3998 vtop->r2 = ret.r2;
3999 /* handle packed struct return */
4000 if (((s->type.t & VT_BTYPE) == VT_STRUCT) && !sret) {
4001 int addr;
4002 size = type_size(&s->type, &align);
4003 loc = (loc - size) & -align;
4004 addr = loc;
4005 vset(&ret.type, VT_LOCAL | VT_LVAL, addr);
4006 vswap();
4007 vstore();
4008 vtop--;
4009 vset(&s->type, VT_LOCAL | VT_LVAL, addr);
4010 }
4011 } else {
4012 break;
4013 }
4014 }
4015 }
4016
4017 ST_FUNC void expr_prod(void)
4018 {
4019 int t;
4020
4021 unary();
4022 while (tok == '*' || tok == '/' || tok == '%') {
4023 t = tok;
4024 next();
4025 unary();
4026 gen_op(t);
4027 }
4028 }
4029
4030 ST_FUNC void expr_sum(void)
4031 {
4032 int t;
4033
4034 expr_prod();
4035 while (tok == '+' || tok == '-') {
4036 t = tok;
4037 next();
4038 expr_prod();
4039 gen_op(t);
4040 }
4041 }
4042
4043 static void expr_shift(void)
4044 {
4045 int t;
4046
4047 expr_sum();
4048 while (tok == TOK_SHL || tok == TOK_SAR) {
4049 t = tok;
4050 next();
4051 expr_sum();
4052 gen_op(t);
4053 }
4054 }
4055
4056 static void expr_cmp(void)
4057 {
4058 int t;
4059
4060 expr_shift();
4061 while ((tok >= TOK_ULE && tok <= TOK_GT) ||
4062 tok == TOK_ULT || tok == TOK_UGE) {
4063 t = tok;
4064 next();
4065 expr_shift();
4066 gen_op(t);
4067 }
4068 }
4069
4070 static void expr_cmpeq(void)
4071 {
4072 int t;
4073
4074 expr_cmp();
4075 while (tok == TOK_EQ || tok == TOK_NE) {
4076 t = tok;
4077 next();
4078 expr_cmp();
4079 gen_op(t);
4080 }
4081 }
4082
4083 static void expr_and(void)
4084 {
4085 expr_cmpeq();
4086 while (tok == '&') {
4087 next();
4088 expr_cmpeq();
4089 gen_op('&');
4090 }
4091 }
4092
4093 static void expr_xor(void)
4094 {
4095 expr_and();
4096 while (tok == '^') {
4097 next();
4098 expr_and();
4099 gen_op('^');
4100 }
4101 }
4102
4103 static void expr_or(void)
4104 {
4105 expr_xor();
4106 while (tok == '|') {
4107 next();
4108 expr_xor();
4109 gen_op('|');
4110 }
4111 }
4112
4113 /* XXX: fix this mess */
4114 static void expr_land_const(void)
4115 {
4116 expr_or();
4117 while (tok == TOK_LAND) {
4118 next();
4119 expr_or();
4120 gen_op(TOK_LAND);
4121 }
4122 }
4123
4124 /* XXX: fix this mess */
4125 static void expr_lor_const(void)
4126 {
4127 expr_land_const();
4128 while (tok == TOK_LOR) {
4129 next();
4130 expr_land_const();
4131 gen_op(TOK_LOR);
4132 }
4133 }
4134
4135 /* only used if non constant */
4136 static void expr_land(void)
4137 {
4138 int t;
4139
4140 expr_or();
4141 if (tok == TOK_LAND) {
4142 t = 0;
4143 save_regs(1);
4144 for(;;) {
4145 t = gtst(1, t);
4146 if (tok != TOK_LAND) {
4147 vseti(VT_JMPI, t);
4148 break;
4149 }
4150 next();
4151 expr_or();
4152 }
4153 }
4154 }
4155
4156 static void expr_lor(void)
4157 {
4158 int t;
4159
4160 expr_land();
4161 if (tok == TOK_LOR) {
4162 t = 0;
4163 save_regs(1);
4164 for(;;) {
4165 t = gtst(0, t);
4166 if (tok != TOK_LOR) {
4167 vseti(VT_JMP, t);
4168 break;
4169 }
4170 next();
4171 expr_land();
4172 }
4173 }
4174 }
4175
4176 /* XXX: better constant handling */
4177 static void expr_cond(void)
4178 {
4179 int tt, u, r1, r2, rc, t1, t2, bt1, bt2;
4180 SValue sv;
4181 CType type, type1, type2;
4182
4183 if (const_wanted) {
4184 expr_lor_const();
4185 if (tok == '?') {
4186 CType boolean;
4187 int c;
4188 boolean.t = VT_BOOL;
4189 vdup();
4190 gen_cast(&boolean);
4191 c = vtop->c.i;
4192 vpop();
4193 next();
4194 if (tok != ':' || !gnu_ext) {
4195 vpop();
4196 gexpr();
4197 }
4198 if (!c)
4199 vpop();
4200 skip(':');
4201 expr_cond();
4202 if (c)
4203 vpop();
4204 }
4205 } else {
4206 expr_lor();
4207 if (tok == '?') {
4208 next();
4209 if (vtop != vstack) {
4210 /* needed to avoid having different registers saved in
4211 each branch */
4212 if (is_float(vtop->type.t)) {
4213 rc = RC_FLOAT;
4214 #ifdef TCC_TARGET_X86_64
4215 if ((vtop->type.t & VT_BTYPE) == VT_LDOUBLE) {
4216 rc = RC_ST0;
4217 }
4218 #endif
4219 }
4220 else
4221 rc = RC_INT;
4222 gv(rc);
4223 save_regs(1);
4224 }
4225 if (tok == ':' && gnu_ext) {
4226 gv_dup();
4227 tt = gtst(1, 0);
4228 } else {
4229 tt = gtst(1, 0);
4230 gexpr();
4231 }
4232 type1 = vtop->type;
4233 sv = *vtop; /* save value to handle it later */
4234 vtop--; /* no vpop so that FP stack is not flushed */
4235 skip(':');
4236 u = gjmp(0);
4237 gsym(tt);
4238 expr_cond();
4239 type2 = vtop->type;
4240
4241 t1 = type1.t;
4242 bt1 = t1 & VT_BTYPE;
4243 t2 = type2.t;
4244 bt2 = t2 & VT_BTYPE;
4245 /* cast operands to correct type according to ISOC rules */
4246 if (is_float(bt1) || is_float(bt2)) {
4247 if (bt1 == VT_LDOUBLE || bt2 == VT_LDOUBLE) {
4248 type.t = VT_LDOUBLE;
4249 } else if (bt1 == VT_DOUBLE || bt2 == VT_DOUBLE) {
4250 type.t = VT_DOUBLE;
4251 } else {
4252 type.t = VT_FLOAT;
4253 }
4254 } else if (bt1 == VT_LLONG || bt2 == VT_LLONG) {
4255 /* cast to biggest op */
4256 type.t = VT_LLONG;
4257 /* convert to unsigned if it does not fit in a long long */
4258 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED) ||
4259 (t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED))
4260 type.t |= VT_UNSIGNED;
4261 } else if (bt1 == VT_PTR || bt2 == VT_PTR) {
4262 /* If one is a null ptr constant the result type
4263 is the other. */
4264 if (is_null_pointer (vtop))
4265 type = type1;
4266 else if (is_null_pointer (&sv))
4267 type = type2;
4268 /* XXX: test pointer compatibility, C99 has more elaborate
4269 rules here. */
4270 else
4271 type = type1;
4272 } else if (bt1 == VT_FUNC || bt2 == VT_FUNC) {
4273 /* XXX: test function pointer compatibility */
4274 type = bt1 == VT_FUNC ? type1 : type2;
4275 } else if (bt1 == VT_STRUCT || bt2 == VT_STRUCT) {
4276 /* XXX: test structure compatibility */
4277 type = bt1 == VT_STRUCT ? type1 : type2;
4278 } else if (bt1 == VT_VOID || bt2 == VT_VOID) {
4279 /* NOTE: as an extension, we accept void on only one side */
4280 type.t = VT_VOID;
4281 } else {
4282 /* integer operations */
4283 type.t = VT_INT;
4284 /* convert to unsigned if it does not fit in an integer */
4285 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED) ||
4286 (t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED))
4287 type.t |= VT_UNSIGNED;
4288 }
4289
4290 /* now we convert second operand */
4291 gen_cast(&type);
4292 if (VT_STRUCT == (vtop->type.t & VT_BTYPE))
4293 gaddrof();
4294 rc = RC_INT;
4295 if (is_float(type.t)) {
4296 rc = RC_FLOAT;
4297 #ifdef TCC_TARGET_X86_64
4298 if ((type.t & VT_BTYPE) == VT_LDOUBLE) {
4299 rc = RC_ST0;
4300 }
4301 #endif
4302 } else if ((type.t & VT_BTYPE) == VT_LLONG) {
4303 /* for long longs, we use fixed registers to avoid having
4304 to handle a complicated move */
4305 rc = RC_IRET;
4306 }
4307
4308 r2 = gv(rc);
4309 /* this is horrible, but we must also convert first
4310 operand */
4311 tt = gjmp(0);
4312 gsym(u);
4313 /* put again first value and cast it */
4314 *vtop = sv;
4315 gen_cast(&type);
4316 if (VT_STRUCT == (vtop->type.t & VT_BTYPE))
4317 gaddrof();
4318 r1 = gv(rc);
4319 move_reg(r2, r1, type.t);
4320 vtop->r = r2;
4321 gsym(tt);
4322 }
4323 }
4324 }
4325
4326 static void expr_eq(void)
4327 {
4328 int t;
4329
4330 expr_cond();
4331 if (tok == '=' ||
4332 (tok >= TOK_A_MOD && tok <= TOK_A_DIV) ||
4333 tok == TOK_A_XOR || tok == TOK_A_OR ||
4334 tok == TOK_A_SHL || tok == TOK_A_SAR) {
4335 test_lvalue();
4336 t = tok;
4337 next();
4338 if (t == '=') {
4339 expr_eq();
4340 } else {
4341 vdup();
4342 expr_eq();
4343 gen_op(t & 0x7f);
4344 }
4345 vstore();
4346 }
4347 }
4348
4349 ST_FUNC void gexpr(void)
4350 {
4351 while (1) {
4352 expr_eq();
4353 if (tok != ',')
4354 break;
4355 vpop();
4356 next();
4357 }
4358 }
4359
4360 /* parse an expression and return its type without any side effect. */
4361 static void expr_type(CType *type)
4362 {
4363 int saved_nocode_wanted;
4364
4365 saved_nocode_wanted = nocode_wanted;
4366 nocode_wanted = 1;
4367 gexpr();
4368 *type = vtop->type;
4369 vpop();
4370 nocode_wanted = saved_nocode_wanted;
4371 }
4372
4373 /* parse a unary expression and return its type without any side
4374 effect. */
4375 static void unary_type(CType *type)
4376 {
4377 int a;
4378
4379 a = nocode_wanted;
4380 nocode_wanted = 1;
4381 unary();
4382 *type = vtop->type;
4383 vpop();
4384 nocode_wanted = a;
4385 }
4386
4387 /* parse a constant expression and return value in vtop. */
4388 static void expr_const1(void)
4389 {
4390 int a;
4391 a = const_wanted;
4392 const_wanted = 1;
4393 expr_cond();
4394 const_wanted = a;
4395 }
4396
4397 /* parse an integer constant and return its value. */
4398 ST_FUNC int expr_const(void)
4399 {
4400 int c;
4401 expr_const1();
4402 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) != VT_CONST)
4403 expect("constant expression");
4404 c = vtop->c.i;
4405 vpop();
4406 return c;
4407 }
4408
4409 /* return the label token if current token is a label, otherwise
4410 return zero */
4411 static int is_label(void)
4412 {
4413 int last_tok;
4414
4415 /* fast test first */
4416 if (tok < TOK_UIDENT)
4417 return 0;
4418 /* no need to save tokc because tok is an identifier */
4419 last_tok = tok;
4420 next();
4421 if (tok == ':') {
4422 next();
4423 return last_tok;
4424 } else {
4425 unget_tok(last_tok);
4426 return 0;
4427 }
4428 }
4429
4430 static void label_or_decl(int l)
4431 {
4432 int last_tok;
4433
4434 /* fast test first */
4435 if (tok >= TOK_UIDENT)
4436 {
4437 /* no need to save tokc because tok is an identifier */
4438 last_tok = tok;
4439 next();
4440 if (tok == ':') {
4441 unget_tok(last_tok);
4442 return;
4443 }
4444 unget_tok(last_tok);
4445 }
4446 decl(l);
4447 }
4448
4449 static void block(int *bsym, int *csym, int *case_sym, int *def_sym,
4450 int case_reg, int is_expr)
4451 {
4452 int a, b, c, d;
4453 Sym *s, *frame_bottom;
4454
4455 /* generate line number info */
4456 if (tcc_state->do_debug &&
4457 (last_line_num != file->line_num || last_ind != ind)) {
4458 put_stabn(N_SLINE, 0, file->line_num, ind - func_ind);
4459 last_ind = ind;
4460 last_line_num = file->line_num;
4461 }
4462
4463 if (is_expr) {
4464 /* default return value is (void) */
4465 vpushi(0);
4466 vtop->type.t = VT_VOID;
4467 }
4468
4469 if (tok == TOK_IF) {
4470 /* if test */
4471 next();
4472 skip('(');
4473 gexpr();
4474 skip(')');
4475 a = gtst(1, 0);
4476 block(bsym, csym, case_sym, def_sym, case_reg, 0);
4477 c = tok;
4478 if (c == TOK_ELSE) {
4479 next();
4480 d = gjmp(0);
4481 gsym(a);
4482 block(bsym, csym, case_sym, def_sym, case_reg, 0);
4483 gsym(d); /* patch else jmp */
4484 } else
4485 gsym(a);
4486 } else if (tok == TOK_WHILE) {
4487 next();
4488 d = ind;
4489 skip('(');
4490 gexpr();
4491 skip(')');
4492 a = gtst(1, 0);
4493 b = 0;
4494 block(&a, &b, case_sym, def_sym, case_reg, 0);
4495 gjmp_addr(d);
4496 gsym(a);
4497 gsym_addr(b, d);
4498 } else if (tok == '{') {
4499 Sym *llabel;
4500 int block_vla_sp_loc, *saved_vla_sp_loc, saved_vla_flags;
4501
4502 next();
4503 /* record local declaration stack position */
4504 s = local_stack;
4505 frame_bottom = sym_push2(&local_stack, SYM_FIELD, 0, 0);
4506 frame_bottom->next = scope_stack_bottom;
4507 scope_stack_bottom = frame_bottom;
4508 llabel = local_label_stack;
4509
4510 /* save VLA state */
4511 block_vla_sp_loc = *(saved_vla_sp_loc = vla_sp_loc);
4512 if (saved_vla_sp_loc != &vla_sp_root_loc)
4513 vla_sp_loc = &block_vla_sp_loc;
4514
4515 saved_vla_flags = vla_flags;
4516 vla_flags |= VLA_NEED_NEW_FRAME;
4517
4518 /* handle local labels declarations */
4519 if (tok == TOK_LABEL) {
4520 next();
4521 for(;;) {
4522 if (tok < TOK_UIDENT)
4523 expect("label identifier");
4524 label_push(&local_label_stack, tok, LABEL_DECLARED);
4525 next();
4526 if (tok == ',') {
4527 next();
4528 } else {
4529 skip(';');
4530 break;
4531 }
4532 }
4533 }
4534 while (tok != '}') {
4535 label_or_decl(VT_LOCAL);
4536 if (tok != '}') {
4537 if (is_expr)
4538 vpop();
4539 block(bsym, csym, case_sym, def_sym, case_reg, is_expr);
4540 }
4541 }
4542 /* pop locally defined labels */
4543 label_pop(&local_label_stack, llabel);
4544 if(is_expr) {
4545 /* XXX: this solution makes only valgrind happy...
4546 triggered by gcc.c-torture/execute/20000917-1.c */
4547 Sym *p;
4548 switch(vtop->type.t & VT_BTYPE) {
4549 case VT_PTR:
4550 case VT_STRUCT:
4551 case VT_ENUM:
4552 case VT_FUNC:
4553 for(p=vtop->type.ref;p;p=p->prev)
4554 if(p->prev==s)
4555 tcc_error("unsupported expression type");
4556 }
4557 }
4558 /* pop locally defined symbols */
4559 scope_stack_bottom = scope_stack_bottom->next;
4560 sym_pop(&local_stack, s);
4561
4562 /* Pop VLA frames and restore stack pointer if required */
4563 if (saved_vla_sp_loc != &vla_sp_root_loc)
4564 *saved_vla_sp_loc = block_vla_sp_loc;
4565 if (vla_sp_loc != (saved_vla_sp_loc == &vla_sp_root_loc ? &vla_sp_root_loc : &block_vla_sp_loc)) {
4566 vla_sp_loc = saved_vla_sp_loc;
4567 gen_vla_sp_restore(*vla_sp_loc);
4568 }
4569 vla_flags = (vla_flags & ~VLA_SCOPE_FLAGS) | (saved_vla_flags & VLA_SCOPE_FLAGS);
4570
4571 next();
4572 } else if (tok == TOK_RETURN) {
4573 next();
4574 if (tok != ';') {
4575 gexpr();
4576 gen_assign_cast(&func_vt);
4577 if ((func_vt.t & VT_BTYPE) == VT_STRUCT) {
4578 CType type, ret_type;
4579 int ret_align;
4580 if (gfunc_sret(&func_vt, &ret_type, &ret_align)) {
4581 /* if returning structure, must copy it to implicit
4582 first pointer arg location */
4583 type = func_vt;
4584 mk_pointer(&type);
4585 vset(&type, VT_LOCAL | VT_LVAL, func_vc);
4586 indir();
4587 vswap();
4588 /* copy structure value to pointer */
4589 vstore();
4590 } else {
4591 /* returning structure packed into registers */
4592 int size, addr, align;
4593 size = type_size(&func_vt,&align);
4594 if ((vtop->r != (VT_LOCAL | VT_LVAL) || (vtop->c.i & (ret_align-1)))
4595 && (align & (ret_align-1))) {
4596 loc = (loc - size) & -align;
4597 addr = loc;
4598 type = func_vt;
4599 vset(&type, VT_LOCAL | VT_LVAL, addr);
4600 vswap();
4601 vstore();
4602 vset(&ret_type, VT_LOCAL | VT_LVAL, addr);
4603 }
4604 vtop->type = ret_type;
4605 if (is_float(ret_type.t))
4606 gv(rc_fret(ret_type.t));
4607 else
4608 gv(RC_IRET);
4609 }
4610 } else if (is_float(func_vt.t)) {
4611 gv(rc_fret(func_vt.t));
4612 } else {
4613 gv(RC_IRET);
4614 }
4615 vtop--; /* NOT vpop() because on x86 it would flush the fp stack */
4616 }
4617 skip(';');
4618 rsym = gjmp(rsym); /* jmp */
4619 } else if (tok == TOK_BREAK) {
4620 /* compute jump */
4621 if (!bsym)
4622 tcc_error("cannot break");
4623 *bsym = gjmp(*bsym);
4624 next();
4625 skip(';');
4626 } else if (tok == TOK_CONTINUE) {
4627 /* compute jump */
4628 if (!csym)
4629 tcc_error("cannot continue");
4630 *csym = gjmp(*csym);
4631 next();
4632 skip(';');
4633 } else if (tok == TOK_FOR) {
4634 int e;
4635 next();
4636 skip('(');
4637 s = local_stack;
4638 frame_bottom = sym_push2(&local_stack, SYM_FIELD, 0, 0);
4639 frame_bottom->next = scope_stack_bottom;
4640 scope_stack_bottom = frame_bottom;
4641 if (tok != ';') {
4642 /* c99 for-loop init decl? */
4643 if (!decl0(VT_LOCAL, 1)) {
4644 /* no, regular for-loop init expr */
4645 gexpr();
4646 vpop();
4647 }
4648 }
4649 skip(';');
4650 d = ind;
4651 c = ind;
4652 a = 0;
4653 b = 0;
4654 if (tok != ';') {
4655 gexpr();
4656 a = gtst(1, 0);
4657 }
4658 skip(';');
4659 if (tok != ')') {
4660 e = gjmp(0);
4661 c = ind;
4662 gexpr();
4663 vpop();
4664 gjmp_addr(d);
4665 gsym(e);
4666 }
4667 skip(')');
4668 block(&a, &b, case_sym, def_sym, case_reg, 0);
4669 gjmp_addr(c);
4670 gsym(a);
4671 gsym_addr(b, c);
4672 scope_stack_bottom = scope_stack_bottom->next;
4673 sym_pop(&local_stack, s);
4674 } else
4675 if (tok == TOK_DO) {
4676 next();
4677 a = 0;
4678 b = 0;
4679 d = ind;
4680 block(&a, &b, case_sym, def_sym, case_reg, 0);
4681 skip(TOK_WHILE);
4682 skip('(');
4683 gsym(b);
4684 gexpr();
4685 c = gtst(0, 0);
4686 gsym_addr(c, d);
4687 skip(')');
4688 gsym(a);
4689 skip(';');
4690 } else
4691 if (tok == TOK_SWITCH) {
4692 next();
4693 skip('(');
4694 gexpr();
4695 /* XXX: other types than integer */
4696 case_reg = gv(RC_INT);
4697 vpop();
4698 skip(')');
4699 a = 0;
4700 b = gjmp(0); /* jump to first case */
4701 c = 0;
4702 block(&a, csym, &b, &c, case_reg, 0);
4703 /* if no default, jmp after switch */
4704 if (c == 0)
4705 c = ind;
4706 /* default label */
4707 gsym_addr(b, c);
4708 /* break label */
4709 gsym(a);
4710 } else
4711 if (tok == TOK_CASE) {
4712 int v1, v2;
4713 if (!case_sym)
4714 expect("switch");
4715 next();
4716 v1 = expr_const();
4717 v2 = v1;
4718 if (gnu_ext && tok == TOK_DOTS) {
4719 next();
4720 v2 = expr_const();
4721 if (v2 < v1)
4722 tcc_warning("empty case range");
4723 }
4724 /* since a case is like a label, we must skip it with a jmp */
4725 b = gjmp(0);
4726 gsym(*case_sym);
4727 vseti(case_reg, 0);
4728 vpushi(v1);
4729 if (v1 == v2) {
4730 gen_op(TOK_EQ);
4731 *case_sym = gtst(1, 0);
4732 } else {
4733 gen_op(TOK_GE);
4734 *case_sym = gtst(1, 0);
4735 vseti(case_reg, 0);
4736 vpushi(v2);
4737 gen_op(TOK_LE);
4738 *case_sym = gtst(1, *case_sym);
4739 }
4740 gsym(b);
4741 skip(':');
4742 is_expr = 0;
4743 goto block_after_label;
4744 } else
4745 if (tok == TOK_DEFAULT) {
4746 next();
4747 skip(':');
4748 if (!def_sym)
4749 expect("switch");
4750 if (*def_sym)
4751 tcc_error("too many 'default'");
4752 *def_sym = ind;
4753 is_expr = 0;
4754 goto block_after_label;
4755 } else
4756 if (tok == TOK_GOTO) {
4757 next();
4758 if (tok == '*' && gnu_ext) {
4759 /* computed goto */
4760 next();
4761 gexpr();
4762 if ((vtop->type.t & VT_BTYPE) != VT_PTR)
4763 expect("pointer");
4764 ggoto();
4765 } else if (tok >= TOK_UIDENT) {
4766 s = label_find(tok);
4767 /* put forward definition if needed */
4768 if (!s) {
4769 s = label_push(&global_label_stack, tok, LABEL_FORWARD);
4770 } else {
4771 if (s->r == LABEL_DECLARED)
4772 s->r = LABEL_FORWARD;
4773 }
4774 /* label already defined */
4775 if (vla_flags & VLA_IN_SCOPE) {
4776 /* If VLAs are in use, save the current stack pointer and
4777 reset the stack pointer to what it was at function entry
4778 (label will restore stack pointer in inner scopes) */
4779 vla_sp_save();
4780 gen_vla_sp_restore(vla_sp_root_loc);
4781 }
4782 if (s->r & LABEL_FORWARD)
4783 s->jnext = gjmp(s->jnext);
4784 else
4785 gjmp_addr(s->jnext);
4786 next();
4787 } else {
4788 expect("label identifier");
4789 }
4790 skip(';');
4791 } else if (tok == TOK_ASM1 || tok == TOK_ASM2 || tok == TOK_ASM3) {
4792 asm_instr();
4793 } else {
4794 b = is_label();
4795 if (b) {
4796 /* label case */
4797 if (vla_flags & VLA_IN_SCOPE) {
4798 /* save/restore stack pointer across label
4799 this is a no-op when combined with the load immediately
4800 after the label unless we arrive via goto */
4801 vla_sp_save();
4802 }
4803 s = label_find(b);
4804 if (s) {
4805 if (s->r == LABEL_DEFINED)
4806 tcc_error("duplicate label '%s'", get_tok_str(s->v, NULL));
4807 gsym(s->jnext);
4808 s->r = LABEL_DEFINED;
4809 } else {
4810 s = label_push(&global_label_stack, b, LABEL_DEFINED);
4811 }
4812 s->jnext = ind;
4813 if (vla_flags & VLA_IN_SCOPE) {
4814 gen_vla_sp_restore(*vla_sp_loc);
4815 vla_flags |= VLA_NEED_NEW_FRAME;
4816 }
4817 /* we accept this, but it is a mistake */
4818 block_after_label:
4819 if (tok == '}') {
4820 tcc_warning("deprecated use of label at end of compound statement");
4821 } else {
4822 if (is_expr)
4823 vpop();
4824 block(bsym, csym, case_sym, def_sym, case_reg, is_expr);
4825 }
4826 } else {
4827 /* expression case */
4828 if (tok != ';') {
4829 if (is_expr) {
4830 vpop();
4831 gexpr();
4832 } else {
4833 gexpr();
4834 vpop();
4835 }
4836 }
4837 skip(';');
4838 }
4839 }
4840 }
4841
4842 /* t is the array or struct type. c is the array or struct
4843 address. cur_index/cur_field is the pointer to the current
4844 value. 'size_only' is true if only size info is needed (only used
4845 in arrays) */
4846 static void decl_designator(CType *type, Section *sec, unsigned long c,
4847 int *cur_index, Sym **cur_field,
4848 int size_only)
4849 {
4850 Sym *s, *f;
4851 int notfirst, index, index_last, align, l, nb_elems, elem_size;
4852 CType type1;
4853
4854 notfirst = 0;
4855 elem_size = 0;
4856 nb_elems = 1;
4857 if (gnu_ext && (l = is_label()) != 0)
4858 goto struct_field;
4859 while (tok == '[' || tok == '.') {
4860 if (tok == '[') {
4861 if (!(type->t & VT_ARRAY))
4862 expect("array type");
4863 s = type->ref;
4864 next();
4865 index = expr_const();
4866 if (index < 0 || (s->c >= 0 && index >= s->c))
4867 expect("invalid index");
4868 if (tok == TOK_DOTS && gnu_ext) {
4869 next();
4870 index_last = expr_const();
4871 if (index_last < 0 ||
4872 (s->c >= 0 && index_last >= s->c) ||
4873 index_last < index)
4874 expect("invalid index");
4875 } else {
4876 index_last = index;
4877 }
4878 skip(']');
4879 if (!notfirst)
4880 *cur_index = index_last;
4881 type = pointed_type(type);
4882 elem_size = type_size(type, &align);
4883 c += index * elem_size;
4884 /* NOTE: we only support ranges for last designator */
4885 nb_elems = index_last - index + 1;
4886 if (nb_elems != 1) {
4887 notfirst = 1;
4888 break;
4889 }
4890 } else {
4891 next();
4892 l = tok;
4893 next();
4894 struct_field:
4895 if ((type->t & VT_BTYPE) != VT_STRUCT)
4896 expect("struct/union type");
4897 s = type->ref;
4898 l |= SYM_FIELD;
4899 f = s->next;
4900 while (f) {
4901 if (f->v == l)
4902 break;
4903 f = f->next;
4904 }
4905 if (!f)
4906 expect("field");
4907 if (!notfirst)
4908 *cur_field = f;
4909 /* XXX: fix this mess by using explicit storage field */
4910 type1 = f->type;
4911 type1.t |= (type->t & ~VT_TYPE);
4912 type = &type1;
4913 c += f->c;
4914 }
4915 notfirst = 1;
4916 }
4917 if (notfirst) {
4918 if (tok == '=') {
4919 next();
4920 } else {
4921 if (!gnu_ext)
4922 expect("=");
4923 }
4924 } else {
4925 if (type->t & VT_ARRAY) {
4926 index = *cur_index;
4927 type = pointed_type(type);
4928 c += index * type_size(type, &align);
4929 } else {
4930 f = *cur_field;
4931 if (!f)
4932 tcc_error("too many field init");
4933 /* XXX: fix this mess by using explicit storage field */
4934 type1 = f->type;
4935 type1.t |= (type->t & ~VT_TYPE);
4936 type = &type1;
4937 c += f->c;
4938 }
4939 }
4940 decl_initializer(type, sec, c, 0, size_only);
4941
4942 /* XXX: make it more general */
4943 if (!size_only && nb_elems > 1) {
4944 unsigned long c_end;
4945 uint8_t *src, *dst;
4946 int i;
4947
4948 if (!sec)
4949 tcc_error("range init not supported yet for dynamic storage");
4950 c_end = c + nb_elems * elem_size;
4951 if (c_end > sec->data_allocated)
4952 section_realloc(sec, c_end);
4953 src = sec->data + c;
4954 dst = src;
4955 for(i = 1; i < nb_elems; i++) {
4956 dst += elem_size;
4957 memcpy(dst, src, elem_size);
4958 }
4959 }
4960 }
4961
4962 #define EXPR_VAL 0
4963 #define EXPR_CONST 1
4964 #define EXPR_ANY 2
4965
4966 /* store a value or an expression directly in global data or in local array */
4967 static void init_putv(CType *type, Section *sec, unsigned long c,
4968 int v, int expr_type)
4969 {
4970 int saved_global_expr, bt, bit_pos, bit_size;
4971 void *ptr;
4972 unsigned long long bit_mask;
4973 CType dtype;
4974
4975 switch(expr_type) {
4976 case EXPR_VAL:
4977 vpushi(v);
4978 break;
4979 case EXPR_CONST:
4980 /* compound literals must be allocated globally in this case */
4981 saved_global_expr = global_expr;
4982 global_expr = 1;
4983 expr_const1();
4984 global_expr = saved_global_expr;
4985 /* NOTE: symbols are accepted */
4986 if ((vtop->r & (VT_VALMASK | VT_LVAL)) != VT_CONST)
4987 tcc_error("initializer element is not constant");
4988 break;
4989 case EXPR_ANY:
4990 expr_eq();
4991 break;
4992 }
4993
4994 dtype = *type;
4995 dtype.t &= ~VT_CONSTANT; /* need to do that to avoid false warning */
4996
4997 if (sec) {
4998 /* XXX: not portable */
4999 /* XXX: generate error if incorrect relocation */
5000 gen_assign_cast(&dtype);
5001 bt = type->t & VT_BTYPE;
5002 /* we'll write at most 12 bytes */
5003 if (c + 12 > sec->data_allocated) {
5004 section_realloc(sec, c + 12);
5005 }
5006 ptr = sec->data + c;
5007 /* XXX: make code faster ? */
5008 if (!(type->t & VT_BITFIELD)) {
5009 bit_pos = 0;
5010 bit_size = 32;
5011 bit_mask = -1LL;
5012 } else {
5013 bit_pos = (vtop->type.t >> VT_STRUCT_SHIFT) & 0x3f;
5014 bit_size = (vtop->type.t >> (VT_STRUCT_SHIFT + 6)) & 0x3f;
5015 bit_mask = (1LL << bit_size) - 1;
5016 }
5017 if ((vtop->r & VT_SYM) &&
5018 (bt == VT_BYTE ||
5019 bt == VT_SHORT ||
5020 bt == VT_DOUBLE ||
5021 bt == VT_LDOUBLE ||
5022 bt == VT_LLONG ||
5023 (bt == VT_INT && bit_size != 32)))
5024 tcc_error("initializer element is not computable at load time");
5025 switch(bt) {
5026 case VT_BOOL:
5027 vtop->c.i = (vtop->c.i != 0);
5028 case VT_BYTE:
5029 *(char *)ptr |= (vtop->c.i & bit_mask) << bit_pos;
5030 break;
5031 case VT_SHORT:
5032 *(short *)ptr |= (vtop->c.i & bit_mask) << bit_pos;
5033 break;
5034 case VT_DOUBLE:
5035 *(double *)ptr = vtop->c.d;
5036 break;
5037 case VT_LDOUBLE:
5038 *(long double *)ptr = vtop->c.ld;
5039 break;
5040 case VT_LLONG:
5041 *(long long *)ptr |= (vtop->c.ll & bit_mask) << bit_pos;
5042 break;
5043 default:
5044 if (vtop->r & VT_SYM) {
5045 greloc(sec, vtop->sym, c, R_DATA_PTR);
5046 }
5047 *(int *)ptr |= (vtop->c.i & bit_mask) << bit_pos;
5048 break;
5049 }
5050 vtop--;
5051 } else {
5052 vset(&dtype, VT_LOCAL|VT_LVAL, c);
5053 vswap();
5054 vstore();
5055 vpop();
5056 }
5057 }
5058
5059 /* put zeros for variable based init */
5060 static void init_putz(CType *t, Section *sec, unsigned long c, int size)
5061 {
5062 if (sec) {
5063 /* nothing to do because globals are already set to zero */
5064 } else {
5065 vpush_global_sym(&func_old_type, TOK_memset);
5066 vseti(VT_LOCAL, c);
5067 vpushi(0);
5068 vpushs(size);
5069 gfunc_call(3);
5070 }
5071 }
5072
5073 /* 't' contains the type and storage info. 'c' is the offset of the
5074 object in section 'sec'. If 'sec' is NULL, it means stack based
5075 allocation. 'first' is true if array '{' must be read (multi
5076 dimension implicit array init handling). 'size_only' is true if
5077 size only evaluation is wanted (only for arrays). */
5078 static void decl_initializer(CType *type, Section *sec, unsigned long c,
5079 int first, int size_only)
5080 {
5081 int index, array_length, n, no_oblock, nb, parlevel, parlevel1, i;
5082 int size1, align1, expr_type;
5083 Sym *s, *f;
5084 CType *t1;
5085
5086 if (type->t & VT_VLA) {
5087 int a;
5088
5089 /* save current stack pointer */
5090 if (vla_flags & VLA_NEED_NEW_FRAME) {
5091 vla_sp_save();
5092 vla_flags = VLA_IN_SCOPE;
5093 vla_sp_loc = &vla_sp_loc_tmp;
5094 }
5095
5096 vla_runtime_type_size(type, &a);
5097 gen_vla_alloc(type, a);
5098 vset(type, VT_LOCAL|VT_LVAL, c);
5099 vswap();
5100 vstore();
5101 vpop();
5102 } else if (type->t & VT_ARRAY) {
5103 s = type->ref;
5104 n = s->c;
5105 array_length = 0;
5106 t1 = pointed_type(type);
5107 size1 = type_size(t1, &align1);
5108
5109 no_oblock = 1;
5110 if ((first && tok != TOK_LSTR && tok != TOK_STR) ||
5111 tok == '{') {
5112 if (tok != '{')
5113 tcc_error("character array initializer must be a literal,"
5114 " optionally enclosed in braces");
5115 skip('{');
5116 no_oblock = 0;
5117 }
5118
5119 /* only parse strings here if correct type (otherwise: handle
5120 them as ((w)char *) expressions */
5121 if ((tok == TOK_LSTR &&
5122 #ifdef TCC_TARGET_PE
5123 (t1->t & VT_BTYPE) == VT_SHORT && (t1->t & VT_UNSIGNED)
5124 #else
5125 (t1->t & VT_BTYPE) == VT_INT
5126 #endif
5127 ) || (tok == TOK_STR && (t1->t & VT_BTYPE) == VT_BYTE)) {
5128 while (tok == TOK_STR || tok == TOK_LSTR) {
5129 int cstr_len, ch;
5130 CString *cstr;
5131
5132 cstr = tokc.cstr;
5133 /* compute maximum number of chars wanted */
5134 if (tok == TOK_STR)
5135 cstr_len = cstr->size;
5136 else
5137 cstr_len = cstr->size / sizeof(nwchar_t);
5138 cstr_len--;
5139 nb = cstr_len;
5140 if (n >= 0 && nb > (n - array_length))
5141 nb = n - array_length;
5142 if (!size_only) {
5143 if (cstr_len > nb)
5144 tcc_warning("initializer-string for array is too long");
5145 /* in order to go faster for common case (char
5146 string in global variable, we handle it
5147 specifically */
5148 if (sec && tok == TOK_STR && size1 == 1) {
5149 memcpy(sec->data + c + array_length, cstr->data, nb);
5150 } else {
5151 for(i=0;i<nb;i++) {
5152 if (tok == TOK_STR)
5153 ch = ((unsigned char *)cstr->data)[i];
5154 else
5155 ch = ((nwchar_t *)cstr->data)[i];
5156 init_putv(t1, sec, c + (array_length + i) * size1,
5157 ch, EXPR_VAL);
5158 }
5159 }
5160 }
5161 array_length += nb;
5162 next();
5163 }
5164 /* only add trailing zero if enough storage (no
5165 warning in this case since it is standard) */
5166 if (n < 0 || array_length < n) {
5167 if (!size_only) {
5168 init_putv(t1, sec, c + (array_length * size1), 0, EXPR_VAL);
5169 }
5170 array_length++;
5171 }
5172 } else {
5173 index = 0;
5174 while (tok != '}') {
5175 decl_designator(type, sec, c, &index, NULL, size_only);
5176 if (n >= 0 && index >= n)
5177 tcc_error("index too large");
5178 /* must put zero in holes (note that doing it that way
5179 ensures that it even works with designators) */
5180 if (!size_only && array_length < index) {
5181 init_putz(t1, sec, c + array_length * size1,
5182 (index - array_length) * size1);
5183 }
5184 index++;
5185 if (index > array_length)
5186 array_length = index;
5187 /* special test for multi dimensional arrays (may not
5188 be strictly correct if designators are used at the
5189 same time) */
5190 if (index >= n && no_oblock)
5191 break;
5192 if (tok == '}')
5193 break;
5194 skip(',');
5195 }
5196 }
5197 if (!no_oblock)
5198 skip('}');
5199 /* put zeros at the end */
5200 if (!size_only && n >= 0 && array_length < n) {
5201 init_putz(t1, sec, c + array_length * size1,
5202 (n - array_length) * size1);
5203 }
5204 /* patch type size if needed */
5205 if (n < 0)
5206 s->c = array_length;
5207 } else if ((type->t & VT_BTYPE) == VT_STRUCT &&
5208 (sec || !first || tok == '{')) {
5209 int par_count;
5210
5211 /* NOTE: the previous test is a specific case for automatic
5212 struct/union init */
5213 /* XXX: union needs only one init */
5214
5215 /* XXX: this test is incorrect for local initializers
5216 beginning with ( without {. It would be much more difficult
5217 to do it correctly (ideally, the expression parser should
5218 be used in all cases) */
5219 par_count = 0;
5220 if (tok == '(') {
5221 AttributeDef ad1;
5222 CType type1;
5223 next();
5224 while (tok == '(') {
5225 par_count++;
5226 next();
5227 }
5228 if (!parse_btype(&type1, &ad1))
5229 expect("cast");
5230 type_decl(&type1, &ad1, &n, TYPE_ABSTRACT);
5231 #if 0
5232 if (!is_assignable_types(type, &type1))
5233 tcc_error("invalid type for cast");
5234 #endif
5235 skip(')');
5236 }
5237 no_oblock = 1;
5238 if (first || tok == '{') {
5239 skip('{');
5240 no_oblock = 0;
5241 }
5242 s = type->ref;
5243 f = s->next;
5244 array_length = 0;
5245 index = 0;
5246 n = s->c;
5247 while (tok != '}') {
5248 decl_designator(type, sec, c, NULL, &f, size_only);
5249 index = f->c;
5250 if (!size_only && array_length < index) {
5251 init_putz(type, sec, c + array_length,
5252 index - array_length);
5253 }
5254 index = index + type_size(&f->type, &align1);
5255 if (index > array_length)
5256 array_length = index;
5257
5258 /* gr: skip fields from same union - ugly. */
5259 while (f->next) {
5260 ///printf("index: %2d %08x -- %2d %08x\n", f->c, f->type.t, f->next->c, f->next->type.t);
5261 /* test for same offset */
5262 if (f->next->c != f->c)
5263 break;
5264 /* if yes, test for bitfield shift */
5265 if ((f->type.t & VT_BITFIELD) && (f->next->type.t & VT_BITFIELD)) {
5266 int bit_pos_1 = (f->type.t >> VT_STRUCT_SHIFT) & 0x3f;
5267 int bit_pos_2 = (f->next->type.t >> VT_STRUCT_SHIFT) & 0x3f;
5268 //printf("bitfield %d %d\n", bit_pos_1, bit_pos_2);
5269 if (bit_pos_1 != bit_pos_2)
5270 break;
5271 }
5272 f = f->next;
5273 }
5274
5275 f = f->next;
5276 if (no_oblock && f == NULL)
5277 break;
5278 if (tok == '}')
5279 break;
5280 skip(',');
5281 }
5282 /* put zeros at the end */
5283 if (!size_only && array_length < n) {
5284 init_putz(type, sec, c + array_length,
5285 n - array_length);
5286 }
5287 if (!no_oblock)
5288 skip('}');
5289 while (par_count) {
5290 skip(')');
5291 par_count--;
5292 }
5293 } else if (tok == '{') {
5294 next();
5295 decl_initializer(type, sec, c, first, size_only);
5296 skip('}');
5297 } else if (size_only) {
5298 /* just skip expression */
5299 parlevel = parlevel1 = 0;
5300 while ((parlevel > 0 || parlevel1 > 0 ||
5301 (tok != '}' && tok != ',')) && tok != -1) {
5302 if (tok == '(')
5303 parlevel++;
5304 else if (tok == ')')
5305 parlevel--;
5306 else if (tok == '{')
5307 parlevel1++;
5308 else if (tok == '}')
5309 parlevel1--;
5310 next();
5311 }
5312 } else {
5313 /* currently, we always use constant expression for globals
5314 (may change for scripting case) */
5315 expr_type = EXPR_CONST;
5316 if (!sec)
5317 expr_type = EXPR_ANY;
5318 init_putv(type, sec, c, 0, expr_type);
5319 }
5320 }
5321
5322 /* parse an initializer for type 't' if 'has_init' is non zero, and
5323 allocate space in local or global data space ('r' is either
5324 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
5325 variable 'v' with an associated name represented by 'asm_label' of
5326 scope 'scope' is declared before initializers are parsed. If 'v' is
5327 zero, then a reference to the new object is put in the value stack.
5328 If 'has_init' is 2, a special parsing is done to handle string
5329 constants. */
5330 static void decl_initializer_alloc(CType *type, AttributeDef *ad, int r,
5331 int has_init, int v, char *asm_label,
5332 int scope)
5333 {
5334 int size, align, addr, data_offset;
5335 int level;
5336 ParseState saved_parse_state = {0};
5337 TokenString init_str;
5338 Section *sec;
5339 Sym *flexible_array;
5340
5341 flexible_array = NULL;
5342 if ((type->t & VT_BTYPE) == VT_STRUCT) {
5343 Sym *field = type->ref->next;
5344 if (field) {
5345 while (field->next)
5346 field = field->next;
5347 if (field->type.t & VT_ARRAY && field->type.ref->c < 0)
5348 flexible_array = field;
5349 }
5350 }
5351
5352 size = type_size(type, &align);
5353 /* If unknown size, we must evaluate it before
5354 evaluating initializers because
5355 initializers can generate global data too
5356 (e.g. string pointers or ISOC99 compound
5357 literals). It also simplifies local
5358 initializers handling */
5359 tok_str_new(&init_str);
5360 if (size < 0 || (flexible_array && has_init)) {
5361 if (!has_init)
5362 tcc_error("unknown type size");
5363 /* get all init string */
5364 if (has_init == 2) {
5365 /* only get strings */
5366 while (tok == TOK_STR || tok == TOK_LSTR) {
5367 tok_str_add_tok(&init_str);
5368 next();
5369 }
5370 } else {
5371 level = 0;
5372 while (level > 0 || (tok != ',' && tok != ';')) {
5373 if (tok < 0)
5374 tcc_error("unexpected end of file in initializer");
5375 tok_str_add_tok(&init_str);
5376 if (tok == '{')
5377 level++;
5378 else if (tok == '}') {
5379 level--;
5380 if (level <= 0) {
5381 next();
5382 break;
5383 }
5384 }
5385 next();
5386 }
5387 }
5388 tok_str_add(&init_str, -1);
5389 tok_str_add(&init_str, 0);
5390
5391 /* compute size */
5392 save_parse_state(&saved_parse_state);
5393
5394 macro_ptr = init_str.str;
5395 next();
5396 decl_initializer(type, NULL, 0, 1, 1);
5397 /* prepare second initializer parsing */
5398 macro_ptr = init_str.str;
5399 next();
5400
5401 /* if still unknown size, error */
5402 size = type_size(type, &align);
5403 if (size < 0)
5404 tcc_error("unknown type size");
5405 }
5406 if (flexible_array)
5407 size += flexible_array->type.ref->c * pointed_size(&flexible_array->type);
5408 /* take into account specified alignment if bigger */
5409 if (ad->aligned) {
5410 if (ad->aligned > align)
5411 align = ad->aligned;
5412 } else if (ad->packed) {
5413 align = 1;
5414 }
5415 if ((r & VT_VALMASK) == VT_LOCAL) {
5416 sec = NULL;
5417 #ifdef CONFIG_TCC_BCHECK
5418 if (tcc_state->do_bounds_check && (type->t & VT_ARRAY)) {
5419 loc--;
5420 }
5421 #endif
5422 loc = (loc - size) & -align;
5423 addr = loc;
5424 #ifdef CONFIG_TCC_BCHECK
5425 /* handles bounds */
5426 /* XXX: currently, since we do only one pass, we cannot track
5427 '&' operators, so we add only arrays */
5428 if (tcc_state->do_bounds_check && (type->t & VT_ARRAY)) {
5429 unsigned long *bounds_ptr;
5430 /* add padding between regions */
5431 loc--;
5432 /* then add local bound info */
5433 bounds_ptr = section_ptr_add(lbounds_section, 2 * sizeof(unsigned long));
5434 bounds_ptr[0] = addr;
5435 bounds_ptr[1] = size;
5436 }
5437 #endif
5438 if (v) {
5439 /* local variable */
5440 sym_push(v, type, r, addr);
5441 } else {
5442 /* push local reference */
5443 vset(type, r, addr);
5444 }
5445 } else {
5446 Sym *sym;
5447
5448 sym = NULL;
5449 if (v && scope == VT_CONST) {
5450 /* see if the symbol was already defined */
5451 sym = sym_find(v);
5452 if (sym) {
5453 if (!is_compatible_types(&sym->type, type))
5454 tcc_error("incompatible types for redefinition of '%s'",
5455 get_tok_str(v, NULL));
5456 if (sym->type.t & VT_EXTERN) {
5457 /* if the variable is extern, it was not allocated */
5458 sym->type.t &= ~VT_EXTERN;
5459 /* set array size if it was ommited in extern
5460 declaration */
5461 if ((sym->type.t & VT_ARRAY) &&
5462 sym->type.ref->c < 0 &&
5463 type->ref->c >= 0)
5464 sym->type.ref->c = type->ref->c;
5465 } else {
5466 /* we accept several definitions of the same
5467 global variable. this is tricky, because we
5468 must play with the SHN_COMMON type of the symbol */
5469 /* XXX: should check if the variable was already
5470 initialized. It is incorrect to initialized it
5471 twice */
5472 /* no init data, we won't add more to the symbol */
5473 if (!has_init)
5474 goto no_alloc;
5475 }
5476 }
5477 }
5478
5479 /* allocate symbol in corresponding section */
5480 sec = ad->section;
5481 if (!sec) {
5482 if (has_init)
5483 sec = data_section;
5484 else if (tcc_state->nocommon)
5485 sec = bss_section;
5486 }
5487 if (sec) {
5488 data_offset = sec->data_offset;
5489 data_offset = (data_offset + align - 1) & -align;
5490 addr = data_offset;
5491 /* very important to increment global pointer at this time
5492 because initializers themselves can create new initializers */
5493 data_offset += size;
5494 #ifdef CONFIG_TCC_BCHECK
5495 /* add padding if bound check */
5496 if (tcc_state->do_bounds_check)
5497 data_offset++;
5498 #endif
5499 sec->data_offset = data_offset;
5500 /* allocate section space to put the data */
5501 if (sec->sh_type != SHT_NOBITS &&
5502 data_offset > sec->data_allocated)
5503 section_realloc(sec, data_offset);
5504 /* align section if needed */
5505 if (align > sec->sh_addralign)
5506 sec->sh_addralign = align;
5507 } else {
5508 addr = 0; /* avoid warning */
5509 }
5510
5511 if (v) {
5512 if (scope != VT_CONST || !sym) {
5513 sym = sym_push(v, type, r | VT_SYM, 0);
5514 sym->asm_label = asm_label;
5515 }
5516 /* update symbol definition */
5517 if (sec) {
5518 put_extern_sym(sym, sec, addr, size);
5519 } else {
5520 ElfW(Sym) *esym;
5521 /* put a common area */
5522 put_extern_sym(sym, NULL, align, size);
5523 /* XXX: find a nicer way */
5524 esym = &((ElfW(Sym) *)symtab_section->data)[sym->c];
5525 esym->st_shndx = SHN_COMMON;
5526 }
5527 } else {
5528 CValue cval;
5529
5530 /* push global reference */
5531 sym = get_sym_ref(type, sec, addr, size);
5532 cval.ul = 0;
5533 vsetc(type, VT_CONST | VT_SYM, &cval);
5534 vtop->sym = sym;
5535 }
5536 /* patch symbol weakness */
5537 if (type->t & VT_WEAK)
5538 weaken_symbol(sym);
5539 #ifdef CONFIG_TCC_BCHECK
5540 /* handles bounds now because the symbol must be defined
5541 before for the relocation */
5542 if (tcc_state->do_bounds_check) {
5543 unsigned long *bounds_ptr;
5544
5545 greloc(bounds_section, sym, bounds_section->data_offset, R_DATA_PTR);
5546 /* then add global bound info */
5547 bounds_ptr = section_ptr_add(bounds_section, 2 * sizeof(long));
5548 bounds_ptr[0] = 0; /* relocated */
5549 bounds_ptr[1] = size;
5550 }
5551 #endif
5552 }
5553 if (has_init || (type->t & VT_VLA)) {
5554 decl_initializer(type, sec, addr, 1, 0);
5555 /* restore parse state if needed */
5556 if (init_str.str) {
5557 tok_str_free(init_str.str);
5558 restore_parse_state(&saved_parse_state);
5559 }
5560 /* patch flexible array member size back to -1, */
5561 /* for possible subsequent similar declarations */
5562 if (flexible_array)
5563 flexible_array->type.ref->c = -1;
5564 }
5565 no_alloc: ;
5566 }
5567
5568 static void put_func_debug(Sym *sym)
5569 {
5570 char buf[512];
5571
5572 /* stabs info */
5573 /* XXX: we put here a dummy type */
5574 snprintf(buf, sizeof(buf), "%s:%c1",
5575 funcname, sym->type.t & VT_STATIC ? 'f' : 'F');
5576 put_stabs_r(buf, N_FUN, 0, file->line_num, 0,
5577 cur_text_section, sym->c);
5578 /* //gr gdb wants a line at the function */
5579 put_stabn(N_SLINE, 0, file->line_num, 0);
5580 last_ind = 0;
5581 last_line_num = 0;
5582 }
5583
5584 /* parse an old style function declaration list */
5585 /* XXX: check multiple parameter */
5586 static void func_decl_list(Sym *func_sym)
5587 {
5588 AttributeDef ad;
5589 int v;
5590 Sym *s;
5591 CType btype, type;
5592
5593 /* parse each declaration */
5594 while (tok != '{' && tok != ';' && tok != ',' && tok != TOK_EOF &&
5595 tok != TOK_ASM1 && tok != TOK_ASM2 && tok != TOK_ASM3) {
5596 if (!parse_btype(&btype, &ad))
5597 expect("declaration list");
5598 if (((btype.t & VT_BTYPE) == VT_ENUM ||
5599 (btype.t & VT_BTYPE) == VT_STRUCT) &&
5600 tok == ';') {
5601 /* we accept no variable after */
5602 } else {
5603 for(;;) {
5604 type = btype;
5605 type_decl(&type, &ad, &v, TYPE_DIRECT);
5606 /* find parameter in function parameter list */
5607 s = func_sym->next;
5608 while (s != NULL) {
5609 if ((s->v & ~SYM_FIELD) == v)
5610 goto found;
5611 s = s->next;
5612 }
5613 tcc_error("declaration for parameter '%s' but no such parameter",
5614 get_tok_str(v, NULL));
5615 found:
5616 /* check that no storage specifier except 'register' was given */
5617 if (type.t & VT_STORAGE)
5618 tcc_error("storage class specified for '%s'", get_tok_str(v, NULL));
5619 convert_parameter_type(&type);
5620 /* we can add the type (NOTE: it could be local to the function) */
5621 s->type = type;
5622 /* accept other parameters */
5623 if (tok == ',')
5624 next();
5625 else
5626 break;
5627 }
5628 }
5629 skip(';');
5630 }
5631 }
5632
5633 /* parse a function defined by symbol 'sym' and generate its code in
5634 'cur_text_section' */
5635 static void gen_function(Sym *sym)
5636 {
5637 int saved_nocode_wanted = nocode_wanted;
5638 nocode_wanted = 0;
5639 ind = cur_text_section->data_offset;
5640 /* NOTE: we patch the symbol size later */
5641 put_extern_sym(sym, cur_text_section, ind, 0);
5642 funcname = get_tok_str(sym->v, NULL);
5643 func_ind = ind;
5644 /* Initialize VLA state */
5645 vla_sp_loc = &vla_sp_root_loc;
5646 vla_flags = VLA_NEED_NEW_FRAME;
5647 /* put debug symbol */
5648 if (tcc_state->do_debug)
5649 put_func_debug(sym);
5650 /* push a dummy symbol to enable local sym storage */
5651 sym_push2(&local_stack, SYM_FIELD, 0, 0);
5652 gfunc_prolog(&sym->type);
5653 rsym = 0;
5654 block(NULL, NULL, NULL, NULL, 0, 0);
5655 gsym(rsym);
5656 gfunc_epilog();
5657 cur_text_section->data_offset = ind;
5658 label_pop(&global_label_stack, NULL);
5659 /* reset local stack */
5660 scope_stack_bottom = NULL;
5661 sym_pop(&local_stack, NULL);
5662 /* end of function */
5663 /* patch symbol size */
5664 ((ElfW(Sym) *)symtab_section->data)[sym->c].st_size =
5665 ind - func_ind;
5666 /* patch symbol weakness (this definition overrules any prototype) */
5667 if (sym->type.t & VT_WEAK)
5668 weaken_symbol(sym);
5669 if (tcc_state->do_debug) {
5670 put_stabn(N_FUN, 0, 0, ind - func_ind);
5671 }
5672 /* It's better to crash than to generate wrong code */
5673 cur_text_section = NULL;
5674 funcname = ""; /* for safety */
5675 func_vt.t = VT_VOID; /* for safety */
5676 ind = 0; /* for safety */
5677 nocode_wanted = saved_nocode_wanted;
5678 }
5679
5680 ST_FUNC void gen_inline_functions(void)
5681 {
5682 Sym *sym;
5683 int *str, inline_generated, i;
5684 struct InlineFunc *fn;
5685
5686 /* iterate while inline function are referenced */
5687 for(;;) {
5688 inline_generated = 0;
5689 for (i = 0; i < tcc_state->nb_inline_fns; ++i) {
5690 fn = tcc_state->inline_fns[i];
5691 sym = fn->sym;
5692 if (sym && sym->c) {
5693 /* the function was used: generate its code and
5694 convert it to a normal function */
5695 str = fn->token_str;
5696 fn->sym = NULL;
5697 if (file)
5698 pstrcpy(file->filename, sizeof file->filename, fn->filename);
5699 sym->r = VT_SYM | VT_CONST;
5700 sym->type.t &= ~VT_INLINE;
5701
5702 macro_ptr = str;
5703 next();
5704 cur_text_section = text_section;
5705 gen_function(sym);
5706 macro_ptr = NULL; /* fail safe */
5707
5708 inline_generated = 1;
5709 }
5710 }
5711 if (!inline_generated)
5712 break;
5713 }
5714 for (i = 0; i < tcc_state->nb_inline_fns; ++i) {
5715 fn = tcc_state->inline_fns[i];
5716 str = fn->token_str;
5717 tok_str_free(str);
5718 }
5719 dynarray_reset(&tcc_state->inline_fns, &tcc_state->nb_inline_fns);
5720 }
5721
5722 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
5723 static int decl0(int l, int is_for_loop_init)
5724 {
5725 int v, has_init, r;
5726 CType type, btype;
5727 Sym *sym;
5728 AttributeDef ad;
5729
5730 while (1) {
5731 if (!parse_btype(&btype, &ad)) {
5732 if (is_for_loop_init)
5733 return 0;
5734 /* skip redundant ';' */
5735 /* XXX: find more elegant solution */
5736 if (tok == ';') {
5737 next();
5738 continue;
5739 }
5740 if (l == VT_CONST &&
5741 (tok == TOK_ASM1 || tok == TOK_ASM2 || tok == TOK_ASM3)) {
5742 /* global asm block */
5743 asm_global_instr();
5744 continue;
5745 }
5746 /* special test for old K&R protos without explicit int
5747 type. Only accepted when defining global data */
5748 if (l == VT_LOCAL || tok < TOK_DEFINE)
5749 break;
5750 btype.t = VT_INT;
5751 }
5752 if (((btype.t & VT_BTYPE) == VT_ENUM ||
5753 (btype.t & VT_BTYPE) == VT_STRUCT) &&
5754 tok == ';') {
5755 /* we accept no variable after */
5756 next();
5757 continue;
5758 }
5759 while (1) { /* iterate thru each declaration */
5760 char *asm_label; // associated asm label
5761 type = btype;
5762 type_decl(&type, &ad, &v, TYPE_DIRECT);
5763 #if 0
5764 {
5765 char buf[500];
5766 type_to_str(buf, sizeof(buf), t, get_tok_str(v, NULL));
5767 printf("type = '%s'\n", buf);
5768 }
5769 #endif
5770 if ((type.t & VT_BTYPE) == VT_FUNC) {
5771 if ((type.t & VT_STATIC) && (l == VT_LOCAL)) {
5772 tcc_error("function without file scope cannot be static");
5773 }
5774 /* if old style function prototype, we accept a
5775 declaration list */
5776 sym = type.ref;
5777 if (sym->c == FUNC_OLD)
5778 func_decl_list(sym);
5779 }
5780
5781 asm_label = NULL;
5782 if (gnu_ext && (tok == TOK_ASM1 || tok == TOK_ASM2 || tok == TOK_ASM3)) {
5783 CString astr;
5784
5785 asm_label_instr(&astr);
5786 asm_label = tcc_strdup(astr.data);
5787 cstr_free(&astr);
5788
5789 /* parse one last attribute list, after asm label */
5790 parse_attribute(&ad);
5791 }
5792
5793 if (ad.weak)
5794 type.t |= VT_WEAK;
5795 #ifdef TCC_TARGET_PE
5796 if (ad.func_import)
5797 type.t |= VT_IMPORT;
5798 if (ad.func_export)
5799 type.t |= VT_EXPORT;
5800 #endif
5801 if (tok == '{') {
5802 if (l == VT_LOCAL)
5803 tcc_error("cannot use local functions");
5804 if ((type.t & VT_BTYPE) != VT_FUNC)
5805 expect("function definition");
5806
5807 /* reject abstract declarators in function definition */
5808 sym = type.ref;
5809 while ((sym = sym->next) != NULL)
5810 if (!(sym->v & ~SYM_FIELD))
5811 expect("identifier");
5812
5813 /* XXX: cannot do better now: convert extern line to static inline */
5814 if ((type.t & (VT_EXTERN | VT_INLINE)) == (VT_EXTERN | VT_INLINE))
5815 type.t = (type.t & ~VT_EXTERN) | VT_STATIC;
5816
5817 sym = sym_find(v);
5818 if (sym) {
5819 if ((sym->type.t & VT_BTYPE) != VT_FUNC)
5820 goto func_error1;
5821
5822 r = sym->type.ref->r;
5823
5824 if (!FUNC_PROTO(r))
5825 tcc_error("redefinition of '%s'", get_tok_str(v, NULL));
5826
5827 /* use func_call from prototype if not defined */
5828 if (FUNC_CALL(r) != FUNC_CDECL
5829 && FUNC_CALL(type.ref->r) == FUNC_CDECL)
5830 FUNC_CALL(type.ref->r) = FUNC_CALL(r);
5831
5832 /* use export from prototype */
5833 if (FUNC_EXPORT(r))
5834 FUNC_EXPORT(type.ref->r) = 1;
5835
5836 /* use static from prototype */
5837 if (sym->type.t & VT_STATIC)
5838 type.t = (type.t & ~VT_EXTERN) | VT_STATIC;
5839
5840 if (!is_compatible_types(&sym->type, &type)) {
5841 func_error1:
5842 tcc_error("incompatible types for redefinition of '%s'",
5843 get_tok_str(v, NULL));
5844 }
5845 FUNC_PROTO(type.ref->r) = 0;
5846 /* if symbol is already defined, then put complete type */
5847 sym->type = type;
5848 } else {
5849 /* put function symbol */
5850 sym = global_identifier_push(v, type.t, 0);
5851 sym->type.ref = type.ref;
5852 }
5853
5854 /* static inline functions are just recorded as a kind
5855 of macro. Their code will be emitted at the end of
5856 the compilation unit only if they are used */
5857 if ((type.t & (VT_INLINE | VT_STATIC)) ==
5858 (VT_INLINE | VT_STATIC)) {
5859 TokenString func_str;
5860 int block_level;
5861 struct InlineFunc *fn;
5862 const char *filename;
5863
5864 tok_str_new(&func_str);
5865
5866 block_level = 0;
5867 for(;;) {
5868 int t;
5869 if (tok == TOK_EOF)
5870 tcc_error("unexpected end of file");
5871 tok_str_add_tok(&func_str);
5872 t = tok;
5873 next();
5874 if (t == '{') {
5875 block_level++;
5876 } else if (t == '}') {
5877 block_level--;
5878 if (block_level == 0)
5879 break;
5880 }
5881 }
5882 tok_str_add(&func_str, -1);
5883 tok_str_add(&func_str, 0);
5884 filename = file ? file->filename : "";
5885 fn = tcc_malloc(sizeof *fn + strlen(filename));
5886 strcpy(fn->filename, filename);
5887 fn->sym = sym;
5888 fn->token_str = func_str.str;
5889 dynarray_add((void ***)&tcc_state->inline_fns, &tcc_state->nb_inline_fns, fn);
5890
5891 } else {
5892 /* compute text section */
5893 cur_text_section = ad.section;
5894 if (!cur_text_section)
5895 cur_text_section = text_section;
5896 sym->r = VT_SYM | VT_CONST;
5897 gen_function(sym);
5898 }
5899 break;
5900 } else {
5901 if (btype.t & VT_TYPEDEF) {
5902 /* save typedefed type */
5903 /* XXX: test storage specifiers ? */
5904 sym = sym_push(v, &type, INT_ATTR(&ad), 0);
5905 sym->type.t |= VT_TYPEDEF;
5906 } else {
5907 r = 0;
5908 if ((type.t & VT_BTYPE) == VT_FUNC) {
5909 /* external function definition */
5910 /* specific case for func_call attribute */
5911 ad.func_proto = 1;
5912 type.ref->r = INT_ATTR(&ad);
5913 } else if (!(type.t & VT_ARRAY)) {
5914 /* not lvalue if array */
5915 r |= lvalue_type(type.t);
5916 }
5917 has_init = (tok == '=');
5918 if (has_init && (type.t & VT_VLA))
5919 tcc_error("Variable length array cannot be initialized");
5920 if ((btype.t & VT_EXTERN) || ((type.t & VT_BTYPE) == VT_FUNC) ||
5921 ((type.t & VT_ARRAY) && (type.t & VT_STATIC) &&
5922 !has_init && l == VT_CONST && type.ref->c < 0)) {
5923 /* external variable or function */
5924 /* NOTE: as GCC, uninitialized global static
5925 arrays of null size are considered as
5926 extern */
5927 sym = external_sym(v, &type, r, asm_label);
5928
5929 if (type.t & VT_WEAK)
5930 weaken_symbol(sym);
5931
5932 if (ad.alias_target) {
5933 Section tsec;
5934 Elf32_Sym *esym;
5935 Sym *alias_target;
5936
5937 alias_target = sym_find(ad.alias_target);
5938 if (!alias_target || !alias_target->c)
5939 tcc_error("unsupported forward __alias__ attribute");
5940 esym = &((Elf32_Sym *)symtab_section->data)[alias_target->c];
5941 tsec.sh_num = esym->st_shndx;
5942 put_extern_sym2(sym, &tsec, esym->st_value, esym->st_size, 0);
5943 }
5944 } else {
5945 type.t |= (btype.t & VT_STATIC); /* Retain "static". */
5946 if (type.t & VT_STATIC)
5947 r |= VT_CONST;
5948 else
5949 r |= l;
5950 if (has_init)
5951 next();
5952 decl_initializer_alloc(&type, &ad, r, has_init, v, asm_label, l);
5953 }
5954 }
5955 if (tok != ',') {
5956 if (is_for_loop_init)
5957 return 1;
5958 skip(';');
5959 break;
5960 }
5961 next();
5962 }
5963 ad.aligned = 0;
5964 }
5965 }
5966 return 0;
5967 }
5968
5969 ST_FUNC void decl(int l)
5970 {
5971 decl0(l, 0);
5972 }
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