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tccgen.c: Optimise 0<<x, 0>>x, -1>>x, x&0, x*0, x|-1, x%1.
[tinycc.git] / tccgen.c
blobadc5005c6fcf9e2af9372e231458ea63509d9e5b
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_var; /* true if current function is variadic (used by return instruction) */
70 ST_DATA int func_vc;
71 ST_DATA int last_line_num, last_ind, func_ind; /* debug last line number and pc */
72 ST_DATA char *funcname;
73
74 ST_DATA CType char_pointer_type, func_old_type, int_type, size_type;
75
76 /* ------------------------------------------------------------------------- */
77 static void gen_cast(CType *type);
78 static inline CType *pointed_type(CType *type);
79 static int is_compatible_types(CType *type1, CType *type2);
80 static int parse_btype(CType *type, AttributeDef *ad);
81 static void type_decl(CType *type, AttributeDef *ad, int *v, int td);
82 static void parse_expr_type(CType *type);
83 static void decl_initializer(CType *type, Section *sec, unsigned long c, int first, int size_only, int *par_count_p);
84 static void block(int *bsym, int *csym, int *case_sym, int *def_sym, int case_reg, int is_expr);
85 static void decl_initializer_alloc(CType *type, AttributeDef *ad, int r, int has_init, int v, char *asm_label, int scope);
86 static int decl0(int l, int is_for_loop_init);
87 static void expr_eq(void);
88 static void unary_type(CType *type);
89 static void vla_runtime_type_size(CType *type, int *a);
90 static void vla_sp_save(void);
91 static int is_compatible_parameter_types(CType *type1, CType *type2);
92 static void expr_type(CType *type);
93 ST_FUNC void vpush64(int ty, unsigned long long v);
94 ST_FUNC void vpush(CType *type);
95 ST_FUNC int gvtst(int inv, int t);
96 ST_FUNC int is_btype_size(int bt);
97
98 ST_INLN int is_float(int t)
99 {
100 int bt;
101 bt = t & VT_BTYPE;
102 return bt == VT_LDOUBLE || bt == VT_DOUBLE || bt == VT_FLOAT || bt == VT_QFLOAT;
103 }
104
105 /* we use our own 'finite' function to avoid potential problems with
106 non standard math libs */
107 /* XXX: endianness dependent */
108 ST_FUNC int ieee_finite(double d)
109 {
110 int p[4];
111 memcpy(p, &d, sizeof(double));
112 return ((unsigned)((p[1] | 0x800fffff) + 1)) >> 31;
113 }
114
115 ST_FUNC void test_lvalue(void)
116 {
117 if (!(vtop->r & VT_LVAL))
118 expect("lvalue");
119 }
120
121 /* ------------------------------------------------------------------------- */
122 /* symbol allocator */
123 static Sym *__sym_malloc(void)
124 {
125 Sym *sym_pool, *sym, *last_sym;
126 int i;
127
128 sym_pool = tcc_malloc(SYM_POOL_NB * sizeof(Sym));
129 dynarray_add(&sym_pools, &nb_sym_pools, sym_pool);
130
131 last_sym = sym_free_first;
132 sym = sym_pool;
133 for(i = 0; i < SYM_POOL_NB; i++) {
134 sym->next = last_sym;
135 last_sym = sym;
136 sym++;
137 }
138 sym_free_first = last_sym;
139 return last_sym;
140 }
141
142 static inline Sym *sym_malloc(void)
143 {
144 Sym *sym;
145 sym = sym_free_first;
146 if (!sym)
147 sym = __sym_malloc();
148 sym_free_first = sym->next;
149 return sym;
150 }
151
152 ST_INLN void sym_free(Sym *sym)
153 {
154 sym->next = sym_free_first;
155 tcc_free(sym->asm_label);
156 sym_free_first = sym;
157 }
158
159 /* push, without hashing */
160 ST_FUNC Sym *sym_push2(Sym **ps, int v, int t, long c)
161 {
162 Sym *s;
163 if (ps == &local_stack) {
164 for (s = *ps; s && s != scope_stack_bottom; s = s->prev)
165 if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM && s->v == v)
166 tcc_error("incompatible types for redefinition of '%s'",
167 get_tok_str(v, NULL));
168 }
169 s = sym_malloc();
170 s->asm_label = NULL;
171 s->v = v;
172 s->type.t = t;
173 s->type.ref = NULL;
174 #ifdef _WIN64
175 s->d = NULL;
176 #endif
177 s->c = c;
178 s->next = NULL;
179 /* add in stack */
180 s->prev = *ps;
181 *ps = s;
182 return s;
183 }
184
185 /* find a symbol and return its associated structure. 's' is the top
186 of the symbol stack */
187 ST_FUNC Sym *sym_find2(Sym *s, int v)
188 {
189 while (s) {
190 if (s->v == v)
191 return s;
192 else if (s->v == -1)
193 return NULL;
194 s = s->prev;
195 }
196 return NULL;
197 }
198
199 /* structure lookup */
200 ST_INLN Sym *struct_find(int v)
201 {
202 v -= TOK_IDENT;
203 if ((unsigned)v >= (unsigned)(tok_ident - TOK_IDENT))
204 return NULL;
205 return table_ident[v]->sym_struct;
206 }
207
208 /* find an identifier */
209 ST_INLN Sym *sym_find(int v)
210 {
211 v -= TOK_IDENT;
212 if ((unsigned)v >= (unsigned)(tok_ident - TOK_IDENT))
213 return NULL;
214 return table_ident[v]->sym_identifier;
215 }
216
217 /* push a given symbol on the symbol stack */
218 ST_FUNC Sym *sym_push(int v, CType *type, int r, int c)
219 {
220 Sym *s, **ps;
221 TokenSym *ts;
222
223 if (local_stack)
224 ps = &local_stack;
225 else
226 ps = &global_stack;
227 s = sym_push2(ps, v, type->t, c);
228 s->type.ref = type->ref;
229 s->r = r;
230 /* don't record fields or anonymous symbols */
231 /* XXX: simplify */
232 if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM) {
233 /* record symbol in token array */
234 ts = table_ident[(v & ~SYM_STRUCT) - TOK_IDENT];
235 if (v & SYM_STRUCT)
236 ps = &ts->sym_struct;
237 else
238 ps = &ts->sym_identifier;
239 s->prev_tok = *ps;
240 *ps = s;
241 }
242 return s;
243 }
244
245 /* push a global identifier */
246 ST_FUNC Sym *global_identifier_push(int v, int t, int c)
247 {
248 Sym *s, **ps;
249 s = sym_push2(&global_stack, v, t, c);
250 /* don't record anonymous symbol */
251 if (v < SYM_FIRST_ANOM) {
252 ps = &table_ident[v - TOK_IDENT]->sym_identifier;
253 /* modify the top most local identifier, so that
254 sym_identifier will point to 's' when popped */
255 while (*ps != NULL)
256 ps = &(*ps)->prev_tok;
257 s->prev_tok = NULL;
258 *ps = s;
259 }
260 return s;
261 }
262
263 /* pop symbols until top reaches 'b' */
264 ST_FUNC void sym_pop(Sym **ptop, Sym *b)
265 {
266 Sym *s, *ss, **ps;
267 TokenSym *ts;
268 int v;
269
270 s = *ptop;
271 while(s != b) {
272 ss = s->prev;
273 v = s->v;
274 /* remove symbol in token array */
275 /* XXX: simplify */
276 if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM) {
277 ts = table_ident[(v & ~SYM_STRUCT) - TOK_IDENT];
278 if (v & SYM_STRUCT)
279 ps = &ts->sym_struct;
280 else
281 ps = &ts->sym_identifier;
282 *ps = s->prev_tok;
283 }
284 sym_free(s);
285 s = ss;
286 }
287 *ptop = b;
288 }
289
290 static void weaken_symbol(Sym *sym)
291 {
292 sym->type.t |= VT_WEAK;
293 if (sym->c > 0) {
294 int esym_type;
295 ElfW(Sym) *esym;
296
297 esym = &((ElfW(Sym) *)symtab_section->data)[sym->c];
298 esym_type = ELFW(ST_TYPE)(esym->st_info);
299 esym->st_info = ELFW(ST_INFO)(STB_WEAK, esym_type);
300 }
301 }
302
303 static void apply_visibility(Sym *sym, CType *type)
304 {
305 int vis = sym->type.t & VT_VIS_MASK;
306 int vis2 = type->t & VT_VIS_MASK;
307 if (vis == (STV_DEFAULT << VT_VIS_SHIFT))
308 vis = vis2;
309 else if (vis2 == (STV_DEFAULT << VT_VIS_SHIFT))
310 ;
311 else
312 vis = (vis < vis2) ? vis : vis2;
313 sym->type.t &= ~VT_VIS_MASK;
314 sym->type.t |= vis;
315
316 if (sym->c > 0) {
317 ElfW(Sym) *esym;
318
319 esym = &((ElfW(Sym) *)symtab_section->data)[sym->c];
320 vis >>= VT_VIS_SHIFT;
321 esym->st_other = (esym->st_other & ~ELFW(ST_VISIBILITY)(-1)) | vis;
322 }
323 }
324
325 /* ------------------------------------------------------------------------- */
326
327 ST_FUNC void swap(int *p, int *q)
328 {
329 int t;
330 t = *p;
331 *p = *q;
332 *q = t;
333 }
334
335 static void vsetc(CType *type, int r, CValue *vc)
336 {
337 int v;
338
339 if (vtop >= vstack + (VSTACK_SIZE - 1))
340 tcc_error("memory full (vstack)");
341 /* cannot let cpu flags if other instruction are generated. Also
342 avoid leaving VT_JMP anywhere except on the top of the stack
343 because it would complicate the code generator. */
344 if (vtop >= vstack) {
345 v = vtop->r & VT_VALMASK;
346 if (v == VT_CMP || (v & ~1) == VT_JMP)
347 gv(RC_INT);
348 }
349 vtop++;
350 vtop->type = *type;
351 vtop->r = r;
352 vtop->r2 = VT_CONST;
353 vtop->c = *vc;
354 }
355
356 /* push constant of type "type" with useless value */
357 ST_FUNC void vpush(CType *type)
358 {
359 CValue cval;
360 vsetc(type, VT_CONST, &cval);
361 }
362
363 /* push integer constant */
364 ST_FUNC void vpushi(int v)
365 {
366 CValue cval;
367 cval.i = v;
368 vsetc(&int_type, VT_CONST, &cval);
369 }
370
371 /* push a pointer sized constant */
372 static void vpushs(addr_t v)
373 {
374 CValue cval;
375 cval.ptr_offset = v;
376 vsetc(&size_type, VT_CONST, &cval);
377 }
378
379 /* push arbitrary 64bit constant */
380 ST_FUNC void vpush64(int ty, unsigned long long v)
381 {
382 CValue cval;
383 CType ctype;
384 ctype.t = ty;
385 ctype.ref = NULL;
386 cval.ull = v;
387 vsetc(&ctype, VT_CONST, &cval);
388 }
389
390 /* push long long constant */
391 static inline void vpushll(long long v)
392 {
393 vpush64(VT_LLONG, v);
394 }
395
396 /* push a symbol value of TYPE */
397 static inline void vpushsym(CType *type, Sym *sym)
398 {
399 CValue cval;
400 cval.ptr_offset = 0;
401 vsetc(type, VT_CONST | VT_SYM, &cval);
402 vtop->sym = sym;
403 }
404
405 /* Return a static symbol pointing to a section */
406 ST_FUNC Sym *get_sym_ref(CType *type, Section *sec, unsigned long offset, unsigned long size)
407 {
408 int v;
409 Sym *sym;
410
411 v = anon_sym++;
412 sym = global_identifier_push(v, type->t | VT_STATIC, 0);
413 sym->type.ref = type->ref;
414 sym->r = VT_CONST | VT_SYM;
415 put_extern_sym(sym, sec, offset, size);
416 return sym;
417 }
418
419 /* push a reference to a section offset by adding a dummy symbol */
420 static void vpush_ref(CType *type, Section *sec, unsigned long offset, unsigned long size)
421 {
422 vpushsym(type, get_sym_ref(type, sec, offset, size));
423 }
424
425 /* define a new external reference to a symbol 'v' of type 'u' */
426 ST_FUNC Sym *external_global_sym(int v, CType *type, int r)
427 {
428 Sym *s;
429
430 s = sym_find(v);
431 if (!s) {
432 /* push forward reference */
433 s = global_identifier_push(v, type->t | VT_EXTERN, 0);
434 s->type.ref = type->ref;
435 s->r = r | VT_CONST | VT_SYM;
436 }
437 return s;
438 }
439
440 /* define a new external reference to a symbol 'v' with alternate asm
441 name 'asm_label' of type 'u'. 'asm_label' is equal to NULL if there
442 is no alternate name (most cases) */
443 static Sym *external_sym(int v, CType *type, int r, char *asm_label)
444 {
445 Sym *s;
446
447 s = sym_find(v);
448 if (!s) {
449 /* push forward reference */
450 s = sym_push(v, type, r | VT_CONST | VT_SYM, 0);
451 s->asm_label = asm_label;
452 s->type.t |= VT_EXTERN;
453 } else if (s->type.ref == func_old_type.ref) {
454 s->type.ref = type->ref;
455 s->r = r | VT_CONST | VT_SYM;
456 s->type.t |= VT_EXTERN;
457 } else if (!is_compatible_types(&s->type, type)) {
458 tcc_error("incompatible types for redefinition of '%s'",
459 get_tok_str(v, NULL));
460 }
461 /* Merge some storage attributes. */
462 if (type->t & VT_WEAK)
463 weaken_symbol(s);
464
465 if (type->t & VT_VIS_MASK)
466 apply_visibility(s, type);
467
468 return s;
469 }
470
471 /* push a reference to global symbol v */
472 ST_FUNC void vpush_global_sym(CType *type, int v)
473 {
474 vpushsym(type, external_global_sym(v, type, 0));
475 }
476
477 ST_FUNC void vset(CType *type, int r, int v)
478 {
479 CValue cval;
480
481 cval.i = v;
482 vsetc(type, r, &cval);
483 }
484
485 static void vseti(int r, int v)
486 {
487 CType type;
488 type.t = VT_INT;
489 type.ref = 0;
490 vset(&type, r, v);
491 }
492
493 ST_FUNC void vswap(void)
494 {
495 SValue tmp;
496 /* cannot let cpu flags if other instruction are generated. Also
497 avoid leaving VT_JMP anywhere except on the top of the stack
498 because it would complicate the code generator. */
499 if (vtop >= vstack) {
500 int v = vtop->r & VT_VALMASK;
501 if (v == VT_CMP || (v & ~1) == VT_JMP)
502 gv(RC_INT);
503 }
504 tmp = vtop[0];
505 vtop[0] = vtop[-1];
506 vtop[-1] = tmp;
507
508 /* XXX: +2% overall speed possible with optimized memswap
509 *
510 * memswap(&vtop[0], &vtop[1], sizeof *vtop);
511 */
512 }
513
514 ST_FUNC void vpushv(SValue *v)
515 {
516 if (vtop >= vstack + (VSTACK_SIZE - 1))
517 tcc_error("memory full (vstack)");
518 vtop++;
519 *vtop = *v;
520 }
521
522 static void vdup(void)
523 {
524 vpushv(vtop);
525 }
526
527 /* save r to the memory stack, and mark it as being free */
528 ST_FUNC void save_reg(int r)
529 {
530 int l, saved, size, align;
531 SValue *p, sv;
532 CType *type;
533
534 /* modify all stack values */
535 saved = 0;
536 l = 0;
537 for(p=vstack;p<=vtop;p++) {
538 if ((p->r & VT_VALMASK) == r ||
539 ((p->type.t & VT_BTYPE) == VT_LLONG && (p->r2 & VT_VALMASK) == r)) {
540 /* must save value on stack if not already done */
541 if (!saved) {
542 /* NOTE: must reload 'r' because r might be equal to r2 */
543 r = p->r & VT_VALMASK;
544 /* store register in the stack */
545 type = &p->type;
546 if ((p->r & VT_LVAL) ||
547 (!is_float(type->t) && (type->t & VT_BTYPE) != VT_LLONG))
548 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
549 type = &char_pointer_type;
550 #else
551 type = &int_type;
552 #endif
553 size = type_size(type, &align);
554 loc = (loc - size) & -align;
555 sv.type.t = type->t;
556 sv.r = VT_LOCAL | VT_LVAL;
557 sv.c.ul = loc;
558 store(r, &sv);
559 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
560 /* x86 specific: need to pop fp register ST0 if saved */
561 if (r == TREG_ST0) {
562 o(0xd8dd); /* fstp %st(0) */
563 }
564 #endif
565 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
566 /* special long long case */
567 if ((type->t & VT_BTYPE) == VT_LLONG) {
568 sv.c.ul += 4;
569 store(p->r2, &sv);
570 }
571 #endif
572 l = loc;
573 saved = 1;
574 }
575 /* mark that stack entry as being saved on the stack */
576 if (p->r & VT_LVAL) {
577 /* also clear the bounded flag because the
578 relocation address of the function was stored in
579 p->c.ul */
580 p->r = (p->r & ~(VT_VALMASK | VT_BOUNDED)) | VT_LLOCAL;
581 } else {
582 p->r = lvalue_type(p->type.t) | VT_LOCAL;
583 }
584 p->r2 = VT_CONST;
585 p->c.ul = l;
586 }
587 }
588 }
589
590 #ifdef TCC_TARGET_ARM
591 /* find a register of class 'rc2' with at most one reference on stack.
592 * If none, call get_reg(rc) */
593 ST_FUNC int get_reg_ex(int rc, int rc2)
594 {
595 int r;
596 SValue *p;
597
598 for(r=0;r<NB_REGS;r++) {
599 if (reg_classes[r] & rc2) {
600 int n;
601 n=0;
602 for(p = vstack; p <= vtop; p++) {
603 if ((p->r & VT_VALMASK) == r ||
604 (p->r2 & VT_VALMASK) == r)
605 n++;
606 }
607 if (n <= 1)
608 return r;
609 }
610 }
611 return get_reg(rc);
612 }
613 #endif
614
615 /* find a free register of class 'rc'. If none, save one register */
616 ST_FUNC int get_reg(int rc)
617 {
618 int r;
619 SValue *p;
620
621 /* find a free register */
622 for(r=0;r<NB_REGS;r++) {
623 if (reg_classes[r] & rc) {
624 for(p=vstack;p<=vtop;p++) {
625 if ((p->r & VT_VALMASK) == r ||
626 (p->r2 & VT_VALMASK) == r)
627 goto notfound;
628 }
629 return r;
630 }
631 notfound: ;
632 }
633
634 /* no register left : free the first one on the stack (VERY
635 IMPORTANT to start from the bottom to ensure that we don't
636 spill registers used in gen_opi()) */
637 for(p=vstack;p<=vtop;p++) {
638 /* look at second register (if long long) */
639 r = p->r2 & VT_VALMASK;
640 if (r < VT_CONST && (reg_classes[r] & rc))
641 goto save_found;
642 r = p->r & VT_VALMASK;
643 if (r < VT_CONST && (reg_classes[r] & rc)) {
644 save_found:
645 save_reg(r);
646 return r;
647 }
648 }
649 /* Should never comes here */
650 return -1;
651 }
652
653 /* save registers up to (vtop - n) stack entry */
654 ST_FUNC void save_regs(int n)
655 {
656 int r;
657 SValue *p, *p1;
658 p1 = vtop - n;
659 for(p = vstack;p <= p1; p++) {
660 r = p->r & VT_VALMASK;
661 if (r < VT_CONST) {
662 save_reg(r);
663 }
664 }
665 }
666
667 /* move register 's' (of type 't') to 'r', and flush previous value of r to memory
668 if needed */
669 static void move_reg(int r, int s, int t)
670 {
671 SValue sv;
672
673 if (r != s) {
674 save_reg(r);
675 sv.type.t = t;
676 sv.type.ref = NULL;
677 sv.r = s;
678 sv.c.ul = 0;
679 load(r, &sv);
680 }
681 }
682
683 /* get address of vtop (vtop MUST BE an lvalue) */
684 ST_FUNC void gaddrof(void)
685 {
686 if (vtop->r & VT_REF)
687 gv(RC_INT);
688 vtop->r &= ~VT_LVAL;
689 /* tricky: if saved lvalue, then we can go back to lvalue */
690 if ((vtop->r & VT_VALMASK) == VT_LLOCAL)
691 vtop->r = (vtop->r & ~(VT_VALMASK | VT_LVAL_TYPE)) | VT_LOCAL | VT_LVAL;
692
693
694 }
695
696 #ifdef CONFIG_TCC_BCHECK
697 /* generate lvalue bound code */
698 static void gbound(void)
699 {
700 int lval_type;
701 CType type1;
702
703 vtop->r &= ~VT_MUSTBOUND;
704 /* if lvalue, then use checking code before dereferencing */
705 if (vtop->r & VT_LVAL) {
706 /* if not VT_BOUNDED value, then make one */
707 if (!(vtop->r & VT_BOUNDED)) {
708 lval_type = vtop->r & (VT_LVAL_TYPE | VT_LVAL);
709 /* must save type because we must set it to int to get pointer */
710 type1 = vtop->type;
711 vtop->type.t = VT_INT;
712 gaddrof();
713 vpushi(0);
714 gen_bounded_ptr_add();
715 vtop->r |= lval_type;
716 vtop->type = type1;
717 }
718 /* then check for dereferencing */
719 gen_bounded_ptr_deref();
720 }
721 }
722 #endif
723
724 /* store vtop a register belonging to class 'rc'. lvalues are
725 converted to values. Cannot be used if cannot be converted to
726 register value (such as structures). */
727 ST_FUNC int gv(int rc)
728 {
729 int r, bit_pos, bit_size, size, align, i;
730 int rc2;
731
732 /* NOTE: get_reg can modify vstack[] */
733 if (vtop->type.t & VT_BITFIELD) {
734 CType type;
735 int bits = 32;
736 bit_pos = (vtop->type.t >> VT_STRUCT_SHIFT) & 0x3f;
737 bit_size = (vtop->type.t >> (VT_STRUCT_SHIFT + 6)) & 0x3f;
738 /* remove bit field info to avoid loops */
739 vtop->type.t &= ~(VT_BITFIELD | (-1 << VT_STRUCT_SHIFT));
740 /* cast to int to propagate signedness in following ops */
741 if ((vtop->type.t & VT_BTYPE) == VT_LLONG) {
742 type.t = VT_LLONG;
743 bits = 64;
744 } else
745 type.t = VT_INT;
746 if((vtop->type.t & VT_UNSIGNED) ||
747 (vtop->type.t & VT_BTYPE) == VT_BOOL)
748 type.t |= VT_UNSIGNED;
749 gen_cast(&type);
750 /* generate shifts */
751 vpushi(bits - (bit_pos + bit_size));
752 gen_op(TOK_SHL);
753 vpushi(bits - bit_size);
754 /* NOTE: transformed to SHR if unsigned */
755 gen_op(TOK_SAR);
756 r = gv(rc);
757 } else {
758 if (is_float(vtop->type.t) &&
759 (vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
760 Sym *sym;
761 int *ptr;
762 unsigned long offset;
763 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
764 CValue check;
765 #endif
766
767 /* XXX: unify with initializers handling ? */
768 /* CPUs usually cannot use float constants, so we store them
769 generically in data segment */
770 size = type_size(&vtop->type, &align);
771 offset = (data_section->data_offset + align - 1) & -align;
772 data_section->data_offset = offset;
773 /* XXX: not portable yet */
774 #if defined(__i386__) || defined(__x86_64__)
775 /* Zero pad x87 tenbyte long doubles */
776 if (size == LDOUBLE_SIZE) {
777 vtop->c.tab[2] &= 0xffff;
778 #if LDOUBLE_SIZE == 16
779 vtop->c.tab[3] = 0;
780 #endif
781 }
782 #endif
783 ptr = section_ptr_add(data_section, size);
784 size = size >> 2;
785 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
786 check.d = 1;
787 if(check.tab[0])
788 for(i=0;i<size;i++)
789 ptr[i] = vtop->c.tab[size-1-i];
790 else
791 #endif
792 for(i=0;i<size;i++)
793 ptr[i] = vtop->c.tab[i];
794 sym = get_sym_ref(&vtop->type, data_section, offset, size << 2);
795 vtop->r |= VT_LVAL | VT_SYM;
796 vtop->sym = sym;
797 vtop->c.ptr_offset = 0;
798 }
799 #ifdef CONFIG_TCC_BCHECK
800 if (vtop->r & VT_MUSTBOUND)
801 gbound();
802 #endif
803
804 r = vtop->r & VT_VALMASK;
805 rc2 = (rc & RC_FLOAT) ? RC_FLOAT : RC_INT;
806 #ifndef TCC_TARGET_ARM64
807 if (rc == RC_IRET)
808 rc2 = RC_LRET;
809 #ifdef TCC_TARGET_X86_64
810 else if (rc == RC_FRET)
811 rc2 = RC_QRET;
812 #endif
813 #endif
814
815 /* need to reload if:
816 - constant
817 - lvalue (need to dereference pointer)
818 - already a register, but not in the right class */
819 if (r >= VT_CONST
820 || (vtop->r & VT_LVAL)
821 || !(reg_classes[r] & rc)
822 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
823 || ((vtop->type.t & VT_BTYPE) == VT_QLONG && !(reg_classes[vtop->r2] & rc2))
824 || ((vtop->type.t & VT_BTYPE) == VT_QFLOAT && !(reg_classes[vtop->r2] & rc2))
825 #else
826 || ((vtop->type.t & VT_BTYPE) == VT_LLONG && !(reg_classes[vtop->r2] & rc2))
827 #endif
828 )
829 {
830 r = get_reg(rc);
831 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
832 if (((vtop->type.t & VT_BTYPE) == VT_QLONG) || ((vtop->type.t & VT_BTYPE) == VT_QFLOAT)) {
833 int addr_type = VT_LLONG, load_size = 8, load_type = ((vtop->type.t & VT_BTYPE) == VT_QLONG) ? VT_LLONG : VT_DOUBLE;
834 #else
835 if ((vtop->type.t & VT_BTYPE) == VT_LLONG) {
836 int addr_type = VT_INT, load_size = 4, load_type = VT_INT;
837 unsigned long long ll;
838 #endif
839 int r2, original_type;
840 original_type = vtop->type.t;
841 /* two register type load : expand to two words
842 temporarily */
843 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
844 if ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
845 /* load constant */
846 ll = vtop->c.ull;
847 vtop->c.ui = ll; /* first word */
848 load(r, vtop);
849 vtop->r = r; /* save register value */
850 vpushi(ll >> 32); /* second word */
851 } else
852 #endif
853 if (r >= VT_CONST || /* XXX: test to VT_CONST incorrect ? */
854 (vtop->r & VT_LVAL)) {
855 /* We do not want to modifier the long long
856 pointer here, so the safest (and less
857 efficient) is to save all the other registers
858 in the stack. XXX: totally inefficient. */
859 save_regs(1);
860 /* load from memory */
861 vtop->type.t = load_type;
862 load(r, vtop);
863 vdup();
864 vtop[-1].r = r; /* save register value */
865 /* increment pointer to get second word */
866 vtop->type.t = addr_type;
867 gaddrof();
868 vpushi(load_size);
869 gen_op('+');
870 vtop->r |= VT_LVAL;
871 vtop->type.t = load_type;
872 } else {
873 /* move registers */
874 load(r, vtop);
875 vdup();
876 vtop[-1].r = r; /* save register value */
877 vtop->r = vtop[-1].r2;
878 }
879 /* Allocate second register. Here we rely on the fact that
880 get_reg() tries first to free r2 of an SValue. */
881 r2 = get_reg(rc2);
882 load(r2, vtop);
883 vpop();
884 /* write second register */
885 vtop->r2 = r2;
886 vtop->type.t = original_type;
887 } else if ((vtop->r & VT_LVAL) && !is_float(vtop->type.t)) {
888 int t1, t;
889 /* lvalue of scalar type : need to use lvalue type
890 because of possible cast */
891 t = vtop->type.t;
892 t1 = t;
893 /* compute memory access type */
894 if (vtop->r & VT_REF)
895 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
896 t = VT_PTR;
897 #else
898 t = VT_INT;
899 #endif
900 else if (vtop->r & VT_LVAL_BYTE)
901 t = VT_BYTE;
902 else if (vtop->r & VT_LVAL_SHORT)
903 t = VT_SHORT;
904 if (vtop->r & VT_LVAL_UNSIGNED)
905 t |= VT_UNSIGNED;
906 vtop->type.t = t;
907 load(r, vtop);
908 /* restore wanted type */
909 vtop->type.t = t1;
910 } else {
911 /* one register type load */
912 load(r, vtop);
913 }
914 }
915 vtop->r = r;
916 #ifdef TCC_TARGET_C67
917 /* uses register pairs for doubles */
918 if ((vtop->type.t & VT_BTYPE) == VT_DOUBLE)
919 vtop->r2 = r+1;
920 #endif
921 }
922 return r;
923 }
924
925 /* generate vtop[-1] and vtop[0] in resp. classes rc1 and rc2 */
926 ST_FUNC void gv2(int rc1, int rc2)
927 {
928 int v;
929
930 /* generate more generic register first. But VT_JMP or VT_CMP
931 values must be generated first in all cases to avoid possible
932 reload errors */
933 v = vtop[0].r & VT_VALMASK;
934 if (v != VT_CMP && (v & ~1) != VT_JMP && rc1 <= rc2) {
935 vswap();
936 gv(rc1);
937 vswap();
938 gv(rc2);
939 /* test if reload is needed for first register */
940 if ((vtop[-1].r & VT_VALMASK) >= VT_CONST) {
941 vswap();
942 gv(rc1);
943 vswap();
944 }
945 } else {
946 gv(rc2);
947 vswap();
948 gv(rc1);
949 vswap();
950 /* test if reload is needed for first register */
951 if ((vtop[0].r & VT_VALMASK) >= VT_CONST) {
952 gv(rc2);
953 }
954 }
955 }
956
957 #ifndef TCC_TARGET_ARM64
958 /* wrapper around RC_FRET to return a register by type */
959 static int rc_fret(int t)
960 {
961 #ifdef TCC_TARGET_X86_64
962 if (t == VT_LDOUBLE) {
963 return RC_ST0;
964 }
965 #endif
966 return RC_FRET;
967 }
968 #endif
969
970 /* wrapper around REG_FRET to return a register by type */
971 static int reg_fret(int t)
972 {
973 #ifdef TCC_TARGET_X86_64
974 if (t == VT_LDOUBLE) {
975 return TREG_ST0;
976 }
977 #endif
978 return REG_FRET;
979 }
980
981 /* expand long long on stack in two int registers */
982 static void lexpand(void)
983 {
984 int u;
985
986 u = vtop->type.t & (VT_DEFSIGN | VT_UNSIGNED);
987 gv(RC_INT);
988 vdup();
989 vtop[0].r = vtop[-1].r2;
990 vtop[0].r2 = VT_CONST;
991 vtop[-1].r2 = VT_CONST;
992 vtop[0].type.t = VT_INT | u;
993 vtop[-1].type.t = VT_INT | u;
994 }
995
996 #ifdef TCC_TARGET_ARM
997 /* expand long long on stack */
998 ST_FUNC void lexpand_nr(void)
999 {
1000 int u,v;
1001
1002 u = vtop->type.t & (VT_DEFSIGN | VT_UNSIGNED);
1003 vdup();
1004 vtop->r2 = VT_CONST;
1005 vtop->type.t = VT_INT | u;
1006 v=vtop[-1].r & (VT_VALMASK | VT_LVAL);
1007 if (v == VT_CONST) {
1008 vtop[-1].c.ui = vtop->c.ull;
1009 vtop->c.ui = vtop->c.ull >> 32;
1010 vtop->r = VT_CONST;
1011 } else if (v == (VT_LVAL|VT_CONST) || v == (VT_LVAL|VT_LOCAL)) {
1012 vtop->c.ui += 4;
1013 vtop->r = vtop[-1].r;
1014 } else if (v > VT_CONST) {
1015 vtop--;
1016 lexpand();
1017 } else
1018 vtop->r = vtop[-1].r2;
1019 vtop[-1].r2 = VT_CONST;
1020 vtop[-1].type.t = VT_INT | u;
1021 }
1022 #endif
1023
1024 /* build a long long from two ints */
1025 static void lbuild(int t)
1026 {
1027 gv2(RC_INT, RC_INT);
1028 vtop[-1].r2 = vtop[0].r;
1029 vtop[-1].type.t = t;
1030 vpop();
1031 }
1032
1033 /* rotate n first stack elements to the bottom
1034 I1 ... In -> I2 ... In I1 [top is right]
1035 */
1036 ST_FUNC void vrotb(int n)
1037 {
1038 int i;
1039 SValue tmp;
1040
1041 tmp = vtop[-n + 1];
1042 for(i=-n+1;i!=0;i++)
1043 vtop[i] = vtop[i+1];
1044 vtop[0] = tmp;
1045 }
1046
1047 /* rotate the n elements before entry e towards the top
1048 I1 ... In ... -> In I1 ... I(n-1) ... [top is right]
1049 */
1050 ST_FUNC void vrote(SValue *e, int n)
1051 {
1052 int i;
1053 SValue tmp;
1054
1055 tmp = *e;
1056 for(i = 0;i < n - 1; i++)
1057 e[-i] = e[-i - 1];
1058 e[-n + 1] = tmp;
1059 }
1060
1061 /* rotate n first stack elements to the top
1062 I1 ... In -> In I1 ... I(n-1) [top is right]
1063 */
1064 ST_FUNC void vrott(int n)
1065 {
1066 vrote(vtop, n);
1067 }
1068
1069 /* pop stack value */
1070 ST_FUNC void vpop(void)
1071 {
1072 int v;
1073 v = vtop->r & VT_VALMASK;
1074 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
1075 /* for x86, we need to pop the FP stack */
1076 if (v == TREG_ST0 && !nocode_wanted) {
1077 o(0xd8dd); /* fstp %st(0) */
1078 } else
1079 #endif
1080 if (v == VT_JMP || v == VT_JMPI) {
1081 /* need to put correct jump if && or || without test */
1082 gsym(vtop->c.ul);
1083 }
1084 vtop--;
1085 }
1086
1087 /* convert stack entry to register and duplicate its value in another
1088 register */
1089 static void gv_dup(void)
1090 {
1091 int rc, t, r, r1;
1092 SValue sv;
1093
1094 t = vtop->type.t;
1095 if ((t & VT_BTYPE) == VT_LLONG) {
1096 lexpand();
1097 gv_dup();
1098 vswap();
1099 vrotb(3);
1100 gv_dup();
1101 vrotb(4);
1102 /* stack: H L L1 H1 */
1103 lbuild(t);
1104 vrotb(3);
1105 vrotb(3);
1106 vswap();
1107 lbuild(t);
1108 vswap();
1109 } else {
1110 /* duplicate value */
1111 rc = RC_INT;
1112 sv.type.t = VT_INT;
1113 if (is_float(t)) {
1114 rc = RC_FLOAT;
1115 #ifdef TCC_TARGET_X86_64
1116 if ((t & VT_BTYPE) == VT_LDOUBLE) {
1117 rc = RC_ST0;
1118 }
1119 #endif
1120 sv.type.t = t;
1121 }
1122 r = gv(rc);
1123 r1 = get_reg(rc);
1124 sv.r = r;
1125 sv.c.ul = 0;
1126 load(r1, &sv); /* move r to r1 */
1127 vdup();
1128 /* duplicates value */
1129 if (r != r1)
1130 vtop->r = r1;
1131 }
1132 }
1133
1134 /* Generate value test
1135 *
1136 * Generate a test for any value (jump, comparison and integers) */
1137 ST_FUNC int gvtst(int inv, int t)
1138 {
1139 int v = vtop->r & VT_VALMASK;
1140 if (v != VT_CMP && v != VT_JMP && v != VT_JMPI) {
1141 vpushi(0);
1142 gen_op(TOK_NE);
1143 }
1144 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
1145 /* constant jmp optimization */
1146 if ((vtop->c.i != 0) != inv)
1147 t = gjmp(t);
1148 vtop--;
1149 return t;
1150 }
1151 return gtst(inv, t);
1152 }
1153
1154 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
1155 /* generate CPU independent (unsigned) long long operations */
1156 static void gen_opl(int op)
1157 {
1158 int t, a, b, op1, c, i;
1159 int func;
1160 unsigned short reg_iret = REG_IRET;
1161 unsigned short reg_lret = REG_LRET;
1162 SValue tmp;
1163
1164 switch(op) {
1165 case '/':
1166 case TOK_PDIV:
1167 func = TOK___divdi3;
1168 goto gen_func;
1169 case TOK_UDIV:
1170 func = TOK___udivdi3;
1171 goto gen_func;
1172 case '%':
1173 func = TOK___moddi3;
1174 goto gen_mod_func;
1175 case TOK_UMOD:
1176 func = TOK___umoddi3;
1177 gen_mod_func:
1178 #ifdef TCC_ARM_EABI
1179 reg_iret = TREG_R2;
1180 reg_lret = TREG_R3;
1181 #endif
1182 gen_func:
1183 /* call generic long long function */
1184 vpush_global_sym(&func_old_type, func);
1185 vrott(3);
1186 gfunc_call(2);
1187 vpushi(0);
1188 vtop->r = reg_iret;
1189 vtop->r2 = reg_lret;
1190 break;
1191 case '^':
1192 case '&':
1193 case '|':
1194 case '*':
1195 case '+':
1196 case '-':
1197 t = vtop->type.t;
1198 vswap();
1199 lexpand();
1200 vrotb(3);
1201 lexpand();
1202 /* stack: L1 H1 L2 H2 */
1203 tmp = vtop[0];
1204 vtop[0] = vtop[-3];
1205 vtop[-3] = tmp;
1206 tmp = vtop[-2];
1207 vtop[-2] = vtop[-3];
1208 vtop[-3] = tmp;
1209 vswap();
1210 /* stack: H1 H2 L1 L2 */
1211 if (op == '*') {
1212 vpushv(vtop - 1);
1213 vpushv(vtop - 1);
1214 gen_op(TOK_UMULL);
1215 lexpand();
1216 /* stack: H1 H2 L1 L2 ML MH */
1217 for(i=0;i<4;i++)
1218 vrotb(6);
1219 /* stack: ML MH H1 H2 L1 L2 */
1220 tmp = vtop[0];
1221 vtop[0] = vtop[-2];
1222 vtop[-2] = tmp;
1223 /* stack: ML MH H1 L2 H2 L1 */
1224 gen_op('*');
1225 vrotb(3);
1226 vrotb(3);
1227 gen_op('*');
1228 /* stack: ML MH M1 M2 */
1229 gen_op('+');
1230 gen_op('+');
1231 } else if (op == '+' || op == '-') {
1232 /* XXX: add non carry method too (for MIPS or alpha) */
1233 if (op == '+')
1234 op1 = TOK_ADDC1;
1235 else
1236 op1 = TOK_SUBC1;
1237 gen_op(op1);
1238 /* stack: H1 H2 (L1 op L2) */
1239 vrotb(3);
1240 vrotb(3);
1241 gen_op(op1 + 1); /* TOK_xxxC2 */
1242 } else {
1243 gen_op(op);
1244 /* stack: H1 H2 (L1 op L2) */
1245 vrotb(3);
1246 vrotb(3);
1247 /* stack: (L1 op L2) H1 H2 */
1248 gen_op(op);
1249 /* stack: (L1 op L2) (H1 op H2) */
1250 }
1251 /* stack: L H */
1252 lbuild(t);
1253 break;
1254 case TOK_SAR:
1255 case TOK_SHR:
1256 case TOK_SHL:
1257 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
1258 t = vtop[-1].type.t;
1259 vswap();
1260 lexpand();
1261 vrotb(3);
1262 /* stack: L H shift */
1263 c = (int)vtop->c.i;
1264 /* constant: simpler */
1265 /* NOTE: all comments are for SHL. the other cases are
1266 done by swaping words */
1267 vpop();
1268 if (op != TOK_SHL)
1269 vswap();
1270 if (c >= 32) {
1271 /* stack: L H */
1272 vpop();
1273 if (c > 32) {
1274 vpushi(c - 32);
1275 gen_op(op);
1276 }
1277 if (op != TOK_SAR) {
1278 vpushi(0);
1279 } else {
1280 gv_dup();
1281 vpushi(31);
1282 gen_op(TOK_SAR);
1283 }
1284 vswap();
1285 } else {
1286 vswap();
1287 gv_dup();
1288 /* stack: H L L */
1289 vpushi(c);
1290 gen_op(op);
1291 vswap();
1292 vpushi(32 - c);
1293 if (op == TOK_SHL)
1294 gen_op(TOK_SHR);
1295 else
1296 gen_op(TOK_SHL);
1297 vrotb(3);
1298 /* stack: L L H */
1299 vpushi(c);
1300 if (op == TOK_SHL)
1301 gen_op(TOK_SHL);
1302 else
1303 gen_op(TOK_SHR);
1304 gen_op('|');
1305 }
1306 if (op != TOK_SHL)
1307 vswap();
1308 lbuild(t);
1309 } else {
1310 /* XXX: should provide a faster fallback on x86 ? */
1311 switch(op) {
1312 case TOK_SAR:
1313 func = TOK___ashrdi3;
1314 goto gen_func;
1315 case TOK_SHR:
1316 func = TOK___lshrdi3;
1317 goto gen_func;
1318 case TOK_SHL:
1319 func = TOK___ashldi3;
1320 goto gen_func;
1321 }
1322 }
1323 break;
1324 default:
1325 /* compare operations */
1326 t = vtop->type.t;
1327 vswap();
1328 lexpand();
1329 vrotb(3);
1330 lexpand();
1331 /* stack: L1 H1 L2 H2 */
1332 tmp = vtop[-1];
1333 vtop[-1] = vtop[-2];
1334 vtop[-2] = tmp;
1335 /* stack: L1 L2 H1 H2 */
1336 /* compare high */
1337 op1 = op;
1338 /* when values are equal, we need to compare low words. since
1339 the jump is inverted, we invert the test too. */
1340 if (op1 == TOK_LT)
1341 op1 = TOK_LE;
1342 else if (op1 == TOK_GT)
1343 op1 = TOK_GE;
1344 else if (op1 == TOK_ULT)
1345 op1 = TOK_ULE;
1346 else if (op1 == TOK_UGT)
1347 op1 = TOK_UGE;
1348 a = 0;
1349 b = 0;
1350 gen_op(op1);
1351 if (op1 != TOK_NE) {
1352 a = gvtst(1, 0);
1353 }
1354 if (op != TOK_EQ) {
1355 /* generate non equal test */
1356 /* XXX: NOT PORTABLE yet */
1357 if (a == 0) {
1358 b = gvtst(0, 0);
1359 } else {
1360 #if defined(TCC_TARGET_I386)
1361 b = psym(0x850f, 0);
1362 #elif defined(TCC_TARGET_ARM)
1363 b = ind;
1364 o(0x1A000000 | encbranch(ind, 0, 1));
1365 #elif defined(TCC_TARGET_C67) || defined(TCC_TARGET_ARM64)
1366 tcc_error("not implemented");
1367 #else
1368 #error not supported
1369 #endif
1370 }
1371 }
1372 /* compare low. Always unsigned */
1373 op1 = op;
1374 if (op1 == TOK_LT)
1375 op1 = TOK_ULT;
1376 else if (op1 == TOK_LE)
1377 op1 = TOK_ULE;
1378 else if (op1 == TOK_GT)
1379 op1 = TOK_UGT;
1380 else if (op1 == TOK_GE)
1381 op1 = TOK_UGE;
1382 gen_op(op1);
1383 a = gvtst(1, a);
1384 gsym(b);
1385 vseti(VT_JMPI, a);
1386 break;
1387 }
1388 }
1389 #endif
1390
1391 /* handle integer constant optimizations and various machine
1392 independent opt */
1393 static void gen_opic(int op)
1394 {
1395 int c1, c2, t1, t2, n;
1396 SValue *v1, *v2;
1397 long long l1, l2;
1398 typedef unsigned long long U;
1399
1400 v1 = vtop - 1;
1401 v2 = vtop;
1402 t1 = v1->type.t & VT_BTYPE;
1403 t2 = v2->type.t & VT_BTYPE;
1404
1405 if (t1 == VT_LLONG)
1406 l1 = v1->c.ll;
1407 else if (v1->type.t & VT_UNSIGNED)
1408 l1 = v1->c.ui;
1409 else
1410 l1 = v1->c.i;
1411
1412 if (t2 == VT_LLONG)
1413 l2 = v2->c.ll;
1414 else if (v2->type.t & VT_UNSIGNED)
1415 l2 = v2->c.ui;
1416 else
1417 l2 = v2->c.i;
1418
1419 /* currently, we cannot do computations with forward symbols */
1420 c1 = (v1->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1421 c2 = (v2->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1422 if (c1 && c2) {
1423 switch(op) {
1424 case '+': l1 += l2; break;
1425 case '-': l1 -= l2; break;
1426 case '&': l1 &= l2; break;
1427 case '^': l1 ^= l2; break;
1428 case '|': l1 |= l2; break;
1429 case '*': l1 *= l2; break;
1430
1431 case TOK_PDIV:
1432 case '/':
1433 case '%':
1434 case TOK_UDIV:
1435 case TOK_UMOD:
1436 /* if division by zero, generate explicit division */
1437 if (l2 == 0) {
1438 if (const_wanted)
1439 tcc_error("division by zero in constant");
1440 goto general_case;
1441 }
1442 switch(op) {
1443 default: l1 /= l2; break;
1444 case '%': l1 %= l2; break;
1445 case TOK_UDIV: l1 = (U)l1 / l2; break;
1446 case TOK_UMOD: l1 = (U)l1 % l2; break;
1447 }
1448 break;
1449 case TOK_SHL: l1 <<= l2; break;
1450 case TOK_SHR: l1 = (U)l1 >> l2; break;
1451 case TOK_SAR: l1 >>= l2; break;
1452 /* tests */
1453 case TOK_ULT: l1 = (U)l1 < (U)l2; break;
1454 case TOK_UGE: l1 = (U)l1 >= (U)l2; break;
1455 case TOK_EQ: l1 = l1 == l2; break;
1456 case TOK_NE: l1 = l1 != l2; break;
1457 case TOK_ULE: l1 = (U)l1 <= (U)l2; break;
1458 case TOK_UGT: l1 = (U)l1 > (U)l2; break;
1459 case TOK_LT: l1 = l1 < l2; break;
1460 case TOK_GE: l1 = l1 >= l2; break;
1461 case TOK_LE: l1 = l1 <= l2; break;
1462 case TOK_GT: l1 = l1 > l2; break;
1463 /* logical */
1464 case TOK_LAND: l1 = l1 && l2; break;
1465 case TOK_LOR: l1 = l1 || l2; break;
1466 default:
1467 goto general_case;
1468 }
1469 v1->c.ll = l1;
1470 vtop--;
1471 } else {
1472 /* if commutative ops, put c2 as constant */
1473 if (c1 && (op == '+' || op == '&' || op == '^' ||
1474 op == '|' || op == '*')) {
1475 vswap();
1476 c2 = c1; //c = c1, c1 = c2, c2 = c;
1477 l2 = l1; //l = l1, l1 = l2, l2 = l;
1478 }
1479 if (!const_wanted &&
1480 c1 && ((l1 == 0 &&
1481 (op == TOK_SHL || op == TOK_SHR || op == TOK_SAR)) ||
1482 (l1 == -1 && op == TOK_SAR))) {
1483 /* treat (0 << x), (0 >> x) and (-1 >> x) as constant */
1484 vtop--;
1485 } else if (!const_wanted &&
1486 c2 && ((l2 == 0 && (op == '&' || op == '*')) ||
1487 (l2 == -1 && op == '|') ||
1488 (l2 == 0xffffffff && t2 != VT_LLONG && op == '|') ||
1489 (l2 == 1 && (op == '%' || op == TOK_UMOD)))) {
1490 /* treat (x & 0), (x * 0), (x | -1) and (x % 1) as constant */
1491 if (l2 == 1)
1492 vtop->c.ll = 0;
1493 vswap();
1494 vtop--;
1495 } else if (c2 && (((op == '*' || op == '/' || op == TOK_UDIV ||
1496 op == TOK_PDIV) &&
1497 l2 == 1) ||
1498 ((op == '+' || op == '-' || op == '|' || op == '^' ||
1499 op == TOK_SHL || op == TOK_SHR || op == TOK_SAR) &&
1500 l2 == 0) ||
1501 (op == '&' &&
1502 l2 == -1))) {
1503 /* filter out NOP operations like x*1, x-0, x&-1... */
1504 vtop--;
1505 } else if (c2 && (op == '*' || op == TOK_PDIV || op == TOK_UDIV)) {
1506 /* try to use shifts instead of muls or divs */
1507 if (l2 > 0 && (l2 & (l2 - 1)) == 0) {
1508 n = -1;
1509 while (l2) {
1510 l2 >>= 1;
1511 n++;
1512 }
1513 vtop->c.ll = n;
1514 if (op == '*')
1515 op = TOK_SHL;
1516 else if (op == TOK_PDIV)
1517 op = TOK_SAR;
1518 else
1519 op = TOK_SHR;
1520 }
1521 goto general_case;
1522 } else if (c2 && (op == '+' || op == '-') &&
1523 (((vtop[-1].r & (VT_VALMASK | VT_LVAL | VT_SYM)) == (VT_CONST | VT_SYM))
1524 || (vtop[-1].r & (VT_VALMASK | VT_LVAL)) == VT_LOCAL)) {
1525 /* symbol + constant case */
1526 if (op == '-')
1527 l2 = -l2;
1528 vtop--;
1529 vtop->c.ll += l2;
1530 } else {
1531 general_case:
1532 if (!nocode_wanted) {
1533 /* call low level op generator */
1534 if (t1 == VT_LLONG || t2 == VT_LLONG ||
1535 (PTR_SIZE == 8 && (t1 == VT_PTR || t2 == VT_PTR)))
1536 gen_opl(op);
1537 else
1538 gen_opi(op);
1539 } else {
1540 vtop--;
1541 }
1542 }
1543 }
1544 }
1545
1546 /* generate a floating point operation with constant propagation */
1547 static void gen_opif(int op)
1548 {
1549 int c1, c2;
1550 SValue *v1, *v2;
1551 long double f1, f2;
1552
1553 v1 = vtop - 1;
1554 v2 = vtop;
1555 /* currently, we cannot do computations with forward symbols */
1556 c1 = (v1->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1557 c2 = (v2->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1558 if (c1 && c2) {
1559 if (v1->type.t == VT_FLOAT) {
1560 f1 = v1->c.f;
1561 f2 = v2->c.f;
1562 } else if (v1->type.t == VT_DOUBLE) {
1563 f1 = v1->c.d;
1564 f2 = v2->c.d;
1565 } else {
1566 f1 = v1->c.ld;
1567 f2 = v2->c.ld;
1568 }
1569
1570 /* NOTE: we only do constant propagation if finite number (not
1571 NaN or infinity) (ANSI spec) */
1572 if (!ieee_finite(f1) || !ieee_finite(f2))
1573 goto general_case;
1574
1575 switch(op) {
1576 case '+': f1 += f2; break;
1577 case '-': f1 -= f2; break;
1578 case '*': f1 *= f2; break;
1579 case '/':
1580 if (f2 == 0.0) {
1581 if (const_wanted)
1582 tcc_error("division by zero in constant");
1583 goto general_case;
1584 }
1585 f1 /= f2;
1586 break;
1587 /* XXX: also handles tests ? */
1588 default:
1589 goto general_case;
1590 }
1591 /* XXX: overflow test ? */
1592 if (v1->type.t == VT_FLOAT) {
1593 v1->c.f = f1;
1594 } else if (v1->type.t == VT_DOUBLE) {
1595 v1->c.d = f1;
1596 } else {
1597 v1->c.ld = f1;
1598 }
1599 vtop--;
1600 } else {
1601 general_case:
1602 if (!nocode_wanted) {
1603 gen_opf(op);
1604 } else {
1605 vtop--;
1606 }
1607 }
1608 }
1609
1610 static int pointed_size(CType *type)
1611 {
1612 int align;
1613 return type_size(pointed_type(type), &align);
1614 }
1615
1616 static void vla_runtime_pointed_size(CType *type)
1617 {
1618 int align;
1619 vla_runtime_type_size(pointed_type(type), &align);
1620 }
1621
1622 static inline int is_null_pointer(SValue *p)
1623 {
1624 if ((p->r & (VT_VALMASK | VT_LVAL | VT_SYM)) != VT_CONST)
1625 return 0;
1626 return ((p->type.t & VT_BTYPE) == VT_INT && p->c.i == 0) ||
1627 ((p->type.t & VT_BTYPE) == VT_LLONG && p->c.ll == 0) ||
1628 ((p->type.t & VT_BTYPE) == VT_PTR && p->c.ptr_offset == 0);
1629 }
1630
1631 static inline int is_integer_btype(int bt)
1632 {
1633 return (bt == VT_BYTE || bt == VT_SHORT ||
1634 bt == VT_INT || bt == VT_LLONG);
1635 }
1636
1637 /* check types for comparison or subtraction of pointers */
1638 static void check_comparison_pointer_types(SValue *p1, SValue *p2, int op)
1639 {
1640 CType *type1, *type2, tmp_type1, tmp_type2;
1641 int bt1, bt2;
1642
1643 /* null pointers are accepted for all comparisons as gcc */
1644 if (is_null_pointer(p1) || is_null_pointer(p2))
1645 return;
1646 type1 = &p1->type;
1647 type2 = &p2->type;
1648 bt1 = type1->t & VT_BTYPE;
1649 bt2 = type2->t & VT_BTYPE;
1650 /* accept comparison between pointer and integer with a warning */
1651 if ((is_integer_btype(bt1) || is_integer_btype(bt2)) && op != '-') {
1652 if (op != TOK_LOR && op != TOK_LAND )
1653 tcc_warning("comparison between pointer and integer");
1654 return;
1655 }
1656
1657 /* both must be pointers or implicit function pointers */
1658 if (bt1 == VT_PTR) {
1659 type1 = pointed_type(type1);
1660 } else if (bt1 != VT_FUNC)
1661 goto invalid_operands;
1662
1663 if (bt2 == VT_PTR) {
1664 type2 = pointed_type(type2);
1665 } else if (bt2 != VT_FUNC) {
1666 invalid_operands:
1667 tcc_error("invalid operands to binary %s", get_tok_str(op, NULL));
1668 }
1669 if ((type1->t & VT_BTYPE) == VT_VOID ||
1670 (type2->t & VT_BTYPE) == VT_VOID)
1671 return;
1672 tmp_type1 = *type1;
1673 tmp_type2 = *type2;
1674 tmp_type1.t &= ~(VT_DEFSIGN | VT_UNSIGNED | VT_CONSTANT | VT_VOLATILE);
1675 tmp_type2.t &= ~(VT_DEFSIGN | VT_UNSIGNED | VT_CONSTANT | VT_VOLATILE);
1676 if (!is_compatible_types(&tmp_type1, &tmp_type2)) {
1677 /* gcc-like error if '-' is used */
1678 if (op == '-')
1679 goto invalid_operands;
1680 else
1681 tcc_warning("comparison of distinct pointer types lacks a cast");
1682 }
1683 }
1684
1685 /* generic gen_op: handles types problems */
1686 ST_FUNC void gen_op(int op)
1687 {
1688 int u, t1, t2, bt1, bt2, t;
1689 CType type1;
1690
1691 t1 = vtop[-1].type.t;
1692 t2 = vtop[0].type.t;
1693 bt1 = t1 & VT_BTYPE;
1694 bt2 = t2 & VT_BTYPE;
1695
1696 if (bt1 == VT_PTR || bt2 == VT_PTR) {
1697 /* at least one operand is a pointer */
1698 /* relationnal op: must be both pointers */
1699 if (op >= TOK_ULT && op <= TOK_LOR) {
1700 check_comparison_pointer_types(vtop - 1, vtop, op);
1701 /* pointers are handled are unsigned */
1702 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1703 t = VT_LLONG | VT_UNSIGNED;
1704 #else
1705 t = VT_INT | VT_UNSIGNED;
1706 #endif
1707 goto std_op;
1708 }
1709 /* if both pointers, then it must be the '-' op */
1710 if (bt1 == VT_PTR && bt2 == VT_PTR) {
1711 if (op != '-')
1712 tcc_error("cannot use pointers here");
1713 check_comparison_pointer_types(vtop - 1, vtop, op);
1714 /* XXX: check that types are compatible */
1715 if (vtop[-1].type.t & VT_VLA) {
1716 vla_runtime_pointed_size(&vtop[-1].type);
1717 } else {
1718 vpushi(pointed_size(&vtop[-1].type));
1719 }
1720 vrott(3);
1721 gen_opic(op);
1722 /* set to integer type */
1723 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1724 vtop->type.t = VT_LLONG;
1725 #else
1726 vtop->type.t = VT_INT;
1727 #endif
1728 vswap();
1729 gen_op(TOK_PDIV);
1730 } else {
1731 /* exactly one pointer : must be '+' or '-'. */
1732 if (op != '-' && op != '+')
1733 tcc_error("cannot use pointers here");
1734 /* Put pointer as first operand */
1735 if (bt2 == VT_PTR) {
1736 vswap();
1737 swap(&t1, &t2);
1738 }
1739 type1 = vtop[-1].type;
1740 type1.t &= ~VT_ARRAY;
1741 if (vtop[-1].type.t & VT_VLA)
1742 vla_runtime_pointed_size(&vtop[-1].type);
1743 else {
1744 u = pointed_size(&vtop[-1].type);
1745 if (u < 0)
1746 tcc_error("unknown array element size");
1747 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1748 vpushll(u);
1749 #else
1750 /* XXX: cast to int ? (long long case) */
1751 vpushi(u);
1752 #endif
1753 }
1754 gen_op('*');
1755 #ifdef CONFIG_TCC_BCHECK
1756 /* if evaluating constant expression, no code should be
1757 generated, so no bound check */
1758 if (tcc_state->do_bounds_check && !const_wanted) {
1759 /* if bounded pointers, we generate a special code to
1760 test bounds */
1761 if (op == '-') {
1762 vpushi(0);
1763 vswap();
1764 gen_op('-');
1765 }
1766 gen_bounded_ptr_add();
1767 } else
1768 #endif
1769 {
1770 gen_opic(op);
1771 }
1772 /* put again type if gen_opic() swaped operands */
1773 vtop->type = type1;
1774 }
1775 } else if (is_float(bt1) || is_float(bt2)) {
1776 /* compute bigger type and do implicit casts */
1777 if (bt1 == VT_LDOUBLE || bt2 == VT_LDOUBLE) {
1778 t = VT_LDOUBLE;
1779 } else if (bt1 == VT_DOUBLE || bt2 == VT_DOUBLE) {
1780 t = VT_DOUBLE;
1781 } else {
1782 t = VT_FLOAT;
1783 }
1784 /* floats can only be used for a few operations */
1785 if (op != '+' && op != '-' && op != '*' && op != '/' &&
1786 (op < TOK_ULT || op > TOK_GT))
1787 tcc_error("invalid operands for binary operation");
1788 goto std_op;
1789 } else if (op == TOK_SHR || op == TOK_SAR || op == TOK_SHL) {
1790 t = bt1 == VT_LLONG ? VT_LLONG : VT_INT;
1791 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (t | VT_UNSIGNED))
1792 t |= VT_UNSIGNED;
1793 goto std_op;
1794 } else if (bt1 == VT_LLONG || bt2 == VT_LLONG) {
1795 /* cast to biggest op */
1796 t = VT_LLONG;
1797 /* convert to unsigned if it does not fit in a long long */
1798 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED) ||
1799 (t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED))
1800 t |= VT_UNSIGNED;
1801 goto std_op;
1802 } else if (bt1 == VT_STRUCT || bt2 == VT_STRUCT) {
1803 tcc_error("comparison of struct");
1804 } else {
1805 /* integer operations */
1806 t = VT_INT;
1807 /* convert to unsigned if it does not fit in an integer */
1808 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED) ||
1809 (t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED))
1810 t |= VT_UNSIGNED;
1811 std_op:
1812 /* XXX: currently, some unsigned operations are explicit, so
1813 we modify them here */
1814 if (t & VT_UNSIGNED) {
1815 if (op == TOK_SAR)
1816 op = TOK_SHR;
1817 else if (op == '/')
1818 op = TOK_UDIV;
1819 else if (op == '%')
1820 op = TOK_UMOD;
1821 else if (op == TOK_LT)
1822 op = TOK_ULT;
1823 else if (op == TOK_GT)
1824 op = TOK_UGT;
1825 else if (op == TOK_LE)
1826 op = TOK_ULE;
1827 else if (op == TOK_GE)
1828 op = TOK_UGE;
1829 }
1830 vswap();
1831 type1.t = t;
1832 gen_cast(&type1);
1833 vswap();
1834 /* special case for shifts and long long: we keep the shift as
1835 an integer */
1836 if (op == TOK_SHR || op == TOK_SAR || op == TOK_SHL)
1837 type1.t = VT_INT;
1838 gen_cast(&type1);
1839 if (is_float(t))
1840 gen_opif(op);
1841 else
1842 gen_opic(op);
1843 if (op >= TOK_ULT && op <= TOK_GT) {
1844 /* relationnal op: the result is an int */
1845 vtop->type.t = VT_INT;
1846 } else {
1847 vtop->type.t = t;
1848 }
1849 }
1850 // Make sure that we have converted to an rvalue:
1851 if (vtop->r & VT_LVAL)
1852 gv(is_float(vtop->type.t & VT_BTYPE) ? RC_FLOAT : RC_INT);
1853 }
1854
1855 #ifndef TCC_TARGET_ARM
1856 /* generic itof for unsigned long long case */
1857 static void gen_cvt_itof1(int t)
1858 {
1859 #ifdef TCC_TARGET_ARM64
1860 gen_cvt_itof(t);
1861 #else
1862 if ((vtop->type.t & (VT_BTYPE | VT_UNSIGNED)) ==
1863 (VT_LLONG | VT_UNSIGNED)) {
1864
1865 if (t == VT_FLOAT)
1866 vpush_global_sym(&func_old_type, TOK___floatundisf);
1867 #if LDOUBLE_SIZE != 8
1868 else if (t == VT_LDOUBLE)
1869 vpush_global_sym(&func_old_type, TOK___floatundixf);
1870 #endif
1871 else
1872 vpush_global_sym(&func_old_type, TOK___floatundidf);
1873 vrott(2);
1874 gfunc_call(1);
1875 vpushi(0);
1876 vtop->r = reg_fret(t);
1877 } else {
1878 gen_cvt_itof(t);
1879 }
1880 #endif
1881 }
1882 #endif
1883
1884 /* generic ftoi for unsigned long long case */
1885 static void gen_cvt_ftoi1(int t)
1886 {
1887 #ifdef TCC_TARGET_ARM64
1888 gen_cvt_ftoi(t);
1889 #else
1890 int st;
1891
1892 if (t == (VT_LLONG | VT_UNSIGNED)) {
1893 /* not handled natively */
1894 st = vtop->type.t & VT_BTYPE;
1895 if (st == VT_FLOAT)
1896 vpush_global_sym(&func_old_type, TOK___fixunssfdi);
1897 #if LDOUBLE_SIZE != 8
1898 else if (st == VT_LDOUBLE)
1899 vpush_global_sym(&func_old_type, TOK___fixunsxfdi);
1900 #endif
1901 else
1902 vpush_global_sym(&func_old_type, TOK___fixunsdfdi);
1903 vrott(2);
1904 gfunc_call(1);
1905 vpushi(0);
1906 vtop->r = REG_IRET;
1907 vtop->r2 = REG_LRET;
1908 } else {
1909 gen_cvt_ftoi(t);
1910 }
1911 #endif
1912 }
1913
1914 /* force char or short cast */
1915 static void force_charshort_cast(int t)
1916 {
1917 int bits, dbt;
1918 dbt = t & VT_BTYPE;
1919 /* XXX: add optimization if lvalue : just change type and offset */
1920 if (dbt == VT_BYTE)
1921 bits = 8;
1922 else
1923 bits = 16;
1924 if (t & VT_UNSIGNED) {
1925 vpushi((1 << bits) - 1);
1926 gen_op('&');
1927 } else {
1928 bits = 32 - bits;
1929 vpushi(bits);
1930 gen_op(TOK_SHL);
1931 /* result must be signed or the SAR is converted to an SHL
1932 This was not the case when "t" was a signed short
1933 and the last value on the stack was an unsigned int */
1934 vtop->type.t &= ~VT_UNSIGNED;
1935 vpushi(bits);
1936 gen_op(TOK_SAR);
1937 }
1938 }
1939
1940 /* cast 'vtop' to 'type'. Casting to bitfields is forbidden. */
1941 static void gen_cast(CType *type)
1942 {
1943 int sbt, dbt, sf, df, c, p;
1944
1945 /* special delayed cast for char/short */
1946 /* XXX: in some cases (multiple cascaded casts), it may still
1947 be incorrect */
1948 if (vtop->r & VT_MUSTCAST) {
1949 vtop->r &= ~VT_MUSTCAST;
1950 force_charshort_cast(vtop->type.t);
1951 }
1952
1953 /* bitfields first get cast to ints */
1954 if (vtop->type.t & VT_BITFIELD) {
1955 gv(RC_INT);
1956 }
1957
1958 dbt = type->t & (VT_BTYPE | VT_UNSIGNED);
1959 sbt = vtop->type.t & (VT_BTYPE | VT_UNSIGNED);
1960
1961 if (sbt != dbt) {
1962 sf = is_float(sbt);
1963 df = is_float(dbt);
1964 c = (vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1965 p = (vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == (VT_CONST | VT_SYM);
1966 if (c) {
1967 /* constant case: we can do it now */
1968 /* XXX: in ISOC, cannot do it if error in convert */
1969 if (sbt == VT_FLOAT)
1970 vtop->c.ld = vtop->c.f;
1971 else if (sbt == VT_DOUBLE)
1972 vtop->c.ld = vtop->c.d;
1973
1974 if (df) {
1975 if ((sbt & VT_BTYPE) == VT_LLONG) {
1976 if (sbt & VT_UNSIGNED)
1977 vtop->c.ld = vtop->c.ull;
1978 else
1979 vtop->c.ld = vtop->c.ll;
1980 } else if(!sf) {
1981 if (sbt & VT_UNSIGNED)
1982 vtop->c.ld = vtop->c.ui;
1983 else
1984 vtop->c.ld = vtop->c.i;
1985 }
1986
1987 if (dbt == VT_FLOAT)
1988 vtop->c.f = (float)vtop->c.ld;
1989 else if (dbt == VT_DOUBLE)
1990 vtop->c.d = (double)vtop->c.ld;
1991 } else if (sf && dbt == (VT_LLONG|VT_UNSIGNED)) {
1992 vtop->c.ull = (unsigned long long)vtop->c.ld;
1993 } else if (sf && dbt == VT_BOOL) {
1994 vtop->c.i = (vtop->c.ld != 0);
1995 } else {
1996 if(sf)
1997 vtop->c.ll = (long long)vtop->c.ld;
1998 else if (sbt == (VT_LLONG|VT_UNSIGNED))
1999 vtop->c.ll = vtop->c.ull;
2000 else if (sbt & VT_UNSIGNED)
2001 vtop->c.ll = vtop->c.ui;
2002 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2003 else if (sbt == VT_PTR)
2004 ;
2005 #endif
2006 else if (sbt != VT_LLONG)
2007 vtop->c.ll = vtop->c.i;
2008
2009 if (dbt == (VT_LLONG|VT_UNSIGNED))
2010 vtop->c.ull = vtop->c.ll;
2011 else if (dbt == VT_BOOL)
2012 vtop->c.i = (vtop->c.ll != 0);
2013 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2014 else if (dbt == VT_PTR)
2015 ;
2016 #endif
2017 else if (dbt != VT_LLONG) {
2018 int s = 0;
2019 if ((dbt & VT_BTYPE) == VT_BYTE)
2020 s = 24;
2021 else if ((dbt & VT_BTYPE) == VT_SHORT)
2022 s = 16;
2023 if(dbt & VT_UNSIGNED)
2024 vtop->c.ui = ((unsigned int)vtop->c.ll << s) >> s;
2025 else
2026 vtop->c.i = ((int)vtop->c.ll << s) >> s;
2027 }
2028 }
2029 } else if (p && dbt == VT_BOOL) {
2030 vtop->r = VT_CONST;
2031 vtop->c.i = 1;
2032 } else if (!nocode_wanted) {
2033 /* non constant case: generate code */
2034 if (sf && df) {
2035 /* convert from fp to fp */
2036 gen_cvt_ftof(dbt);
2037 } else if (df) {
2038 /* convert int to fp */
2039 gen_cvt_itof1(dbt);
2040 } else if (sf) {
2041 /* convert fp to int */
2042 if (dbt == VT_BOOL) {
2043 vpushi(0);
2044 gen_op(TOK_NE);
2045 } else {
2046 /* we handle char/short/etc... with generic code */
2047 if (dbt != (VT_INT | VT_UNSIGNED) &&
2048 dbt != (VT_LLONG | VT_UNSIGNED) &&
2049 dbt != VT_LLONG)
2050 dbt = VT_INT;
2051 gen_cvt_ftoi1(dbt);
2052 if (dbt == VT_INT && (type->t & (VT_BTYPE | VT_UNSIGNED)) != dbt) {
2053 /* additional cast for char/short... */
2054 vtop->type.t = dbt;
2055 gen_cast(type);
2056 }
2057 }
2058 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
2059 } else if ((dbt & VT_BTYPE) == VT_LLONG) {
2060 if ((sbt & VT_BTYPE) != VT_LLONG) {
2061 /* scalar to long long */
2062 /* machine independent conversion */
2063 gv(RC_INT);
2064 /* generate high word */
2065 if (sbt == (VT_INT | VT_UNSIGNED)) {
2066 vpushi(0);
2067 gv(RC_INT);
2068 } else {
2069 if (sbt == VT_PTR) {
2070 /* cast from pointer to int before we apply
2071 shift operation, which pointers don't support*/
2072 gen_cast(&int_type);
2073 }
2074 gv_dup();
2075 vpushi(31);
2076 gen_op(TOK_SAR);
2077 }
2078 /* patch second register */
2079 vtop[-1].r2 = vtop->r;
2080 vpop();
2081 }
2082 #else
2083 } else if ((dbt & VT_BTYPE) == VT_LLONG ||
2084 (dbt & VT_BTYPE) == VT_PTR ||
2085 (dbt & VT_BTYPE) == VT_FUNC) {
2086 if ((sbt & VT_BTYPE) != VT_LLONG &&
2087 (sbt & VT_BTYPE) != VT_PTR &&
2088 (sbt & VT_BTYPE) != VT_FUNC) {
2089 /* need to convert from 32bit to 64bit */
2090 gv(RC_INT);
2091 if (sbt != (VT_INT | VT_UNSIGNED)) {
2092 #if defined(TCC_TARGET_ARM64)
2093 gen_cvt_sxtw();
2094 #elif defined(TCC_TARGET_X86_64)
2095 int r = gv(RC_INT);
2096 /* x86_64 specific: movslq */
2097 o(0x6348);
2098 o(0xc0 + (REG_VALUE(r) << 3) + REG_VALUE(r));
2099 #else
2100 #error
2101 #endif
2102 }
2103 }
2104 #endif
2105 } else if (dbt == VT_BOOL) {
2106 /* scalar to bool */
2107 vpushi(0);
2108 gen_op(TOK_NE);
2109 } else if ((dbt & VT_BTYPE) == VT_BYTE ||
2110 (dbt & VT_BTYPE) == VT_SHORT) {
2111 if (sbt == VT_PTR) {
2112 vtop->type.t = VT_INT;
2113 tcc_warning("nonportable conversion from pointer to char/short");
2114 }
2115 force_charshort_cast(dbt);
2116 } else if ((dbt & VT_BTYPE) == VT_INT) {
2117 /* scalar to int */
2118 if (sbt == VT_LLONG) {
2119 /* from long long: just take low order word */
2120 lexpand();
2121 vpop();
2122 }
2123 /* if lvalue and single word type, nothing to do because
2124 the lvalue already contains the real type size (see
2125 VT_LVAL_xxx constants) */
2126 }
2127 }
2128 } else if ((dbt & VT_BTYPE) == VT_PTR && !(vtop->r & VT_LVAL)) {
2129 /* if we are casting between pointer types,
2130 we must update the VT_LVAL_xxx size */
2131 vtop->r = (vtop->r & ~VT_LVAL_TYPE)
2132 | (lvalue_type(type->ref->type.t) & VT_LVAL_TYPE);
2133 }
2134 vtop->type = *type;
2135 }
2136
2137 /* return type size as known at compile time. Put alignment at 'a' */
2138 ST_FUNC int type_size(CType *type, int *a)
2139 {
2140 Sym *s;
2141 int bt;
2142
2143 bt = type->t & VT_BTYPE;
2144 if (bt == VT_STRUCT) {
2145 /* struct/union */
2146 s = type->ref;
2147 *a = s->r;
2148 return s->c;
2149 } else if (bt == VT_PTR) {
2150 if (type->t & VT_ARRAY) {
2151 int ts;
2152
2153 s = type->ref;
2154 ts = type_size(&s->type, a);
2155
2156 if (ts < 0 && s->c < 0)
2157 ts = -ts;
2158
2159 return ts * s->c;
2160 } else {
2161 *a = PTR_SIZE;
2162 return PTR_SIZE;
2163 }
2164 } else if (bt == VT_LDOUBLE) {
2165 *a = LDOUBLE_ALIGN;
2166 return LDOUBLE_SIZE;
2167 } else if (bt == VT_DOUBLE || bt == VT_LLONG) {
2168 #ifdef TCC_TARGET_I386
2169 #ifdef TCC_TARGET_PE
2170 *a = 8;
2171 #else
2172 *a = 4;
2173 #endif
2174 #elif defined(TCC_TARGET_ARM)
2175 #ifdef TCC_ARM_EABI
2176 *a = 8;
2177 #else
2178 *a = 4;
2179 #endif
2180 #else
2181 *a = 8;
2182 #endif
2183 return 8;
2184 } else if (bt == VT_INT || bt == VT_ENUM || bt == VT_FLOAT) {
2185 *a = 4;
2186 return 4;
2187 } else if (bt == VT_SHORT) {
2188 *a = 2;
2189 return 2;
2190 } else if (bt == VT_QLONG || bt == VT_QFLOAT) {
2191 *a = 8;
2192 return 16;
2193 } else {
2194 /* char, void, function, _Bool */
2195 *a = 1;
2196 return 1;
2197 }
2198 }
2199
2200 /* push type size as known at runtime time on top of value stack. Put
2201 alignment at 'a' */
2202 ST_FUNC void vla_runtime_type_size(CType *type, int *a)
2203 {
2204 if (type->t & VT_VLA) {
2205 vset(&int_type, VT_LOCAL|VT_LVAL, type->ref->c);
2206 } else {
2207 vpushi(type_size(type, a));
2208 }
2209 }
2210
2211 static void vla_sp_save(void) {
2212 if (!(vla_flags & VLA_SP_LOC_SET)) {
2213 *vla_sp_loc = (loc -= PTR_SIZE);
2214 vla_flags |= VLA_SP_LOC_SET;
2215 }
2216 if (!(vla_flags & VLA_SP_SAVED)) {
2217 gen_vla_sp_save(*vla_sp_loc);
2218 vla_flags |= VLA_SP_SAVED;
2219 }
2220 }
2221
2222 /* return the pointed type of t */
2223 static inline CType *pointed_type(CType *type)
2224 {
2225 return &type->ref->type;
2226 }
2227
2228 /* modify type so that its it is a pointer to type. */
2229 ST_FUNC void mk_pointer(CType *type)
2230 {
2231 Sym *s;
2232 s = sym_push(SYM_FIELD, type, 0, -1);
2233 type->t = VT_PTR | (type->t & ~VT_TYPE);
2234 type->ref = s;
2235 }
2236
2237 /* compare function types. OLD functions match any new functions */
2238 static int is_compatible_func(CType *type1, CType *type2)
2239 {
2240 Sym *s1, *s2;
2241
2242 s1 = type1->ref;
2243 s2 = type2->ref;
2244 if (!is_compatible_types(&s1->type, &s2->type))
2245 return 0;
2246 /* check func_call */
2247 if (s1->a.func_call != s2->a.func_call)
2248 return 0;
2249 /* XXX: not complete */
2250 if (s1->c == FUNC_OLD || s2->c == FUNC_OLD)
2251 return 1;
2252 if (s1->c != s2->c)
2253 return 0;
2254 while (s1 != NULL) {
2255 if (s2 == NULL)
2256 return 0;
2257 if (!is_compatible_parameter_types(&s1->type, &s2->type))
2258 return 0;
2259 s1 = s1->next;
2260 s2 = s2->next;
2261 }
2262 if (s2)
2263 return 0;
2264 return 1;
2265 }
2266
2267 /* return true if type1 and type2 are the same. If unqualified is
2268 true, qualifiers on the types are ignored.
2269
2270 - enums are not checked as gcc __builtin_types_compatible_p ()
2271 */
2272 static int compare_types(CType *type1, CType *type2, int unqualified)
2273 {
2274 int bt1, t1, t2;
2275
2276 t1 = type1->t & VT_TYPE;
2277 t2 = type2->t & VT_TYPE;
2278 if (unqualified) {
2279 /* strip qualifiers before comparing */
2280 t1 &= ~(VT_CONSTANT | VT_VOLATILE);
2281 t2 &= ~(VT_CONSTANT | VT_VOLATILE);
2282 }
2283 /* Default Vs explicit signedness only matters for char */
2284 if ((t1 & VT_BTYPE) != VT_BYTE) {
2285 t1 &= ~VT_DEFSIGN;
2286 t2 &= ~VT_DEFSIGN;
2287 }
2288 /* XXX: bitfields ? */
2289 if (t1 != t2)
2290 return 0;
2291 /* test more complicated cases */
2292 bt1 = t1 & VT_BTYPE;
2293 if (bt1 == VT_PTR) {
2294 type1 = pointed_type(type1);
2295 type2 = pointed_type(type2);
2296 return is_compatible_types(type1, type2);
2297 } else if (bt1 == VT_STRUCT) {
2298 return (type1->ref == type2->ref);
2299 } else if (bt1 == VT_FUNC) {
2300 return is_compatible_func(type1, type2);
2301 } else {
2302 return 1;
2303 }
2304 }
2305
2306 /* return true if type1 and type2 are exactly the same (including
2307 qualifiers).
2308 */
2309 static int is_compatible_types(CType *type1, CType *type2)
2310 {
2311 return compare_types(type1,type2,0);
2312 }
2313
2314 /* return true if type1 and type2 are the same (ignoring qualifiers).
2315 */
2316 static int is_compatible_parameter_types(CType *type1, CType *type2)
2317 {
2318 return compare_types(type1,type2,1);
2319 }
2320
2321 /* print a type. If 'varstr' is not NULL, then the variable is also
2322 printed in the type */
2323 /* XXX: union */
2324 /* XXX: add array and function pointers */
2325 static void type_to_str(char *buf, int buf_size,
2326 CType *type, const char *varstr)
2327 {
2328 int bt, v, t;
2329 Sym *s, *sa;
2330 char buf1[256];
2331 const char *tstr;
2332
2333 t = type->t & VT_TYPE;
2334 bt = t & VT_BTYPE;
2335 buf[0] = '\0';
2336 if (t & VT_CONSTANT)
2337 pstrcat(buf, buf_size, "const ");
2338 if (t & VT_VOLATILE)
2339 pstrcat(buf, buf_size, "volatile ");
2340 if ((t & (VT_DEFSIGN | VT_UNSIGNED)) == (VT_DEFSIGN | VT_UNSIGNED))
2341 pstrcat(buf, buf_size, "unsigned ");
2342 else if (t & VT_DEFSIGN)
2343 pstrcat(buf, buf_size, "signed ");
2344 switch(bt) {
2345 case VT_VOID:
2346 tstr = "void";
2347 goto add_tstr;
2348 case VT_BOOL:
2349 tstr = "_Bool";
2350 goto add_tstr;
2351 case VT_BYTE:
2352 tstr = "char";
2353 goto add_tstr;
2354 case VT_SHORT:
2355 tstr = "short";
2356 goto add_tstr;
2357 case VT_INT:
2358 tstr = "int";
2359 goto add_tstr;
2360 case VT_LONG:
2361 tstr = "long";
2362 goto add_tstr;
2363 case VT_LLONG:
2364 tstr = "long long";
2365 goto add_tstr;
2366 case VT_FLOAT:
2367 tstr = "float";
2368 goto add_tstr;
2369 case VT_DOUBLE:
2370 tstr = "double";
2371 goto add_tstr;
2372 case VT_LDOUBLE:
2373 tstr = "long double";
2374 add_tstr:
2375 pstrcat(buf, buf_size, tstr);
2376 break;
2377 case VT_ENUM:
2378 case VT_STRUCT:
2379 if (bt == VT_STRUCT)
2380 tstr = "struct ";
2381 else
2382 tstr = "enum ";
2383 pstrcat(buf, buf_size, tstr);
2384 v = type->ref->v & ~SYM_STRUCT;
2385 if (v >= SYM_FIRST_ANOM)
2386 pstrcat(buf, buf_size, "<anonymous>");
2387 else
2388 pstrcat(buf, buf_size, get_tok_str(v, NULL));
2389 break;
2390 case VT_FUNC:
2391 s = type->ref;
2392 type_to_str(buf, buf_size, &s->type, varstr);
2393 pstrcat(buf, buf_size, "(");
2394 sa = s->next;
2395 while (sa != NULL) {
2396 type_to_str(buf1, sizeof(buf1), &sa->type, NULL);
2397 pstrcat(buf, buf_size, buf1);
2398 sa = sa->next;
2399 if (sa)
2400 pstrcat(buf, buf_size, ", ");
2401 }
2402 pstrcat(buf, buf_size, ")");
2403 goto no_var;
2404 case VT_PTR:
2405 s = type->ref;
2406 pstrcpy(buf1, sizeof(buf1), "*");
2407 if (varstr)
2408 pstrcat(buf1, sizeof(buf1), varstr);
2409 type_to_str(buf, buf_size, &s->type, buf1);
2410 goto no_var;
2411 }
2412 if (varstr) {
2413 pstrcat(buf, buf_size, " ");
2414 pstrcat(buf, buf_size, varstr);
2415 }
2416 no_var: ;
2417 }
2418
2419 /* verify type compatibility to store vtop in 'dt' type, and generate
2420 casts if needed. */
2421 static void gen_assign_cast(CType *dt)
2422 {
2423 CType *st, *type1, *type2, tmp_type1, tmp_type2;
2424 char buf1[256], buf2[256];
2425 int dbt, sbt;
2426
2427 st = &vtop->type; /* source type */
2428 dbt = dt->t & VT_BTYPE;
2429 sbt = st->t & VT_BTYPE;
2430 if (sbt == VT_VOID || dbt == VT_VOID) {
2431 if (sbt == VT_VOID && dbt == VT_VOID)
2432 ; /*
2433 It is Ok if both are void
2434 A test program:
2435 void func1() {}
2436 void func2() {
2437 return func1();
2438 }
2439 gcc accepts this program
2440 */
2441 else
2442 tcc_error("cannot cast from/to void");
2443 }
2444 if (dt->t & VT_CONSTANT)
2445 tcc_warning("assignment of read-only location");
2446 switch(dbt) {
2447 case VT_PTR:
2448 /* special cases for pointers */
2449 /* '0' can also be a pointer */
2450 if (is_null_pointer(vtop))
2451 goto type_ok;
2452 /* accept implicit pointer to integer cast with warning */
2453 if (is_integer_btype(sbt)) {
2454 tcc_warning("assignment makes pointer from integer without a cast");
2455 goto type_ok;
2456 }
2457 type1 = pointed_type(dt);
2458 /* a function is implicitely a function pointer */
2459 if (sbt == VT_FUNC) {
2460 if ((type1->t & VT_BTYPE) != VT_VOID &&
2461 !is_compatible_types(pointed_type(dt), st))
2462 tcc_warning("assignment from incompatible pointer type");
2463 goto type_ok;
2464 }
2465 if (sbt != VT_PTR)
2466 goto error;
2467 type2 = pointed_type(st);
2468 if ((type1->t & VT_BTYPE) == VT_VOID ||
2469 (type2->t & VT_BTYPE) == VT_VOID) {
2470 /* void * can match anything */
2471 } else {
2472 /* exact type match, except for unsigned */
2473 tmp_type1 = *type1;
2474 tmp_type2 = *type2;
2475 tmp_type1.t &= ~(VT_DEFSIGN | VT_UNSIGNED | VT_CONSTANT |
2476 VT_VOLATILE);
2477 tmp_type2.t &= ~(VT_DEFSIGN | VT_UNSIGNED | VT_CONSTANT |
2478 VT_VOLATILE);
2479 if (!is_compatible_types(&tmp_type1, &tmp_type2))
2480 tcc_warning("assignment from incompatible pointer type");
2481 }
2482 /* check const and volatile */
2483 if ((!(type1->t & VT_CONSTANT) && (type2->t & VT_CONSTANT)) ||
2484 (!(type1->t & VT_VOLATILE) && (type2->t & VT_VOLATILE)))
2485 tcc_warning("assignment discards qualifiers from pointer target type");
2486 break;
2487 case VT_BYTE:
2488 case VT_SHORT:
2489 case VT_INT:
2490 case VT_LLONG:
2491 if (sbt == VT_PTR || sbt == VT_FUNC) {
2492 tcc_warning("assignment makes integer from pointer without a cast");
2493 }
2494 /* XXX: more tests */
2495 break;
2496 case VT_STRUCT:
2497 tmp_type1 = *dt;
2498 tmp_type2 = *st;
2499 tmp_type1.t &= ~(VT_CONSTANT | VT_VOLATILE);
2500 tmp_type2.t &= ~(VT_CONSTANT | VT_VOLATILE);
2501 if (!is_compatible_types(&tmp_type1, &tmp_type2)) {
2502 error:
2503 type_to_str(buf1, sizeof(buf1), st, NULL);
2504 type_to_str(buf2, sizeof(buf2), dt, NULL);
2505 tcc_error("cannot cast '%s' to '%s'", buf1, buf2);
2506 }
2507 break;
2508 }
2509 type_ok:
2510 gen_cast(dt);
2511 }
2512
2513 /* store vtop in lvalue pushed on stack */
2514 ST_FUNC void vstore(void)
2515 {
2516 int sbt, dbt, ft, r, t, size, align, bit_size, bit_pos, rc, delayed_cast;
2517
2518 ft = vtop[-1].type.t;
2519 sbt = vtop->type.t & VT_BTYPE;
2520 dbt = ft & VT_BTYPE;
2521 if ((((sbt == VT_INT || sbt == VT_SHORT) && dbt == VT_BYTE) ||
2522 (sbt == VT_INT && dbt == VT_SHORT))
2523 && !(vtop->type.t & VT_BITFIELD)) {
2524 /* optimize char/short casts */
2525 delayed_cast = VT_MUSTCAST;
2526 vtop->type.t = ft & (VT_TYPE & ~(VT_BITFIELD | (-1 << VT_STRUCT_SHIFT)));
2527 /* XXX: factorize */
2528 if (ft & VT_CONSTANT)
2529 tcc_warning("assignment of read-only location");
2530 } else {
2531 delayed_cast = 0;
2532 if (!(ft & VT_BITFIELD))
2533 gen_assign_cast(&vtop[-1].type);
2534 }
2535
2536 if (sbt == VT_STRUCT) {
2537 /* if structure, only generate pointer */
2538 /* structure assignment : generate memcpy */
2539 /* XXX: optimize if small size */
2540 if (!nocode_wanted) {
2541 size = type_size(&vtop->type, &align);
2542
2543 /* destination */
2544 vswap();
2545 vtop->type.t = VT_PTR;
2546 gaddrof();
2547
2548 /* address of memcpy() */
2549 #ifdef TCC_ARM_EABI
2550 if(!(align & 7))
2551 vpush_global_sym(&func_old_type, TOK_memcpy8);
2552 else if(!(align & 3))
2553 vpush_global_sym(&func_old_type, TOK_memcpy4);
2554 else
2555 #endif
2556 vpush_global_sym(&func_old_type, TOK_memcpy);
2557
2558 vswap();
2559 /* source */
2560 vpushv(vtop - 2);
2561 vtop->type.t = VT_PTR;
2562 gaddrof();
2563 /* type size */
2564 vpushi(size);
2565 gfunc_call(3);
2566 } else {
2567 vswap();
2568 vpop();
2569 }
2570 /* leave source on stack */
2571 } else if (ft & VT_BITFIELD) {
2572 /* bitfield store handling */
2573
2574 /* save lvalue as expression result (example: s.b = s.a = n;) */
2575 vdup(), vtop[-1] = vtop[-2];
2576
2577 bit_pos = (ft >> VT_STRUCT_SHIFT) & 0x3f;
2578 bit_size = (ft >> (VT_STRUCT_SHIFT + 6)) & 0x3f;
2579 /* remove bit field info to avoid loops */
2580 vtop[-1].type.t = ft & ~(VT_BITFIELD | (-1 << VT_STRUCT_SHIFT));
2581
2582 if((ft & VT_BTYPE) == VT_BOOL) {
2583 gen_cast(&vtop[-1].type);
2584 vtop[-1].type.t = (vtop[-1].type.t & ~VT_BTYPE) | (VT_BYTE | VT_UNSIGNED);
2585 }
2586
2587 /* duplicate destination */
2588 vdup();
2589 vtop[-1] = vtop[-2];
2590
2591 /* mask and shift source */
2592 if((ft & VT_BTYPE) != VT_BOOL) {
2593 if((ft & VT_BTYPE) == VT_LLONG) {
2594 vpushll((1ULL << bit_size) - 1ULL);
2595 } else {
2596 vpushi((1 << bit_size) - 1);
2597 }
2598 gen_op('&');
2599 }
2600 vpushi(bit_pos);
2601 gen_op(TOK_SHL);
2602 /* load destination, mask and or with source */
2603 vswap();
2604 if((ft & VT_BTYPE) == VT_LLONG) {
2605 vpushll(~(((1ULL << bit_size) - 1ULL) << bit_pos));
2606 } else {
2607 vpushi(~(((1 << bit_size) - 1) << bit_pos));
2608 }
2609 gen_op('&');
2610 gen_op('|');
2611 /* store result */
2612 vstore();
2613 /* ... and discard */
2614 vpop();
2615
2616 } else {
2617 #ifdef CONFIG_TCC_BCHECK
2618 /* bound check case */
2619 if (vtop[-1].r & VT_MUSTBOUND) {
2620 vswap();
2621 gbound();
2622 vswap();
2623 }
2624 #endif
2625 if (!nocode_wanted) {
2626 rc = RC_INT;
2627 if (is_float(ft)) {
2628 rc = RC_FLOAT;
2629 #ifdef TCC_TARGET_X86_64
2630 if ((ft & VT_BTYPE) == VT_LDOUBLE) {
2631 rc = RC_ST0;
2632 } else if ((ft & VT_BTYPE) == VT_QFLOAT) {
2633 rc = RC_FRET;
2634 }
2635 #endif
2636 }
2637 r = gv(rc); /* generate value */
2638 /* if lvalue was saved on stack, must read it */
2639 if ((vtop[-1].r & VT_VALMASK) == VT_LLOCAL) {
2640 SValue sv;
2641 t = get_reg(RC_INT);
2642 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2643 sv.type.t = VT_PTR;
2644 #else
2645 sv.type.t = VT_INT;
2646 #endif
2647 sv.r = VT_LOCAL | VT_LVAL;
2648 sv.c.ul = vtop[-1].c.ul;
2649 load(t, &sv);
2650 vtop[-1].r = t | VT_LVAL;
2651 }
2652 /* two word case handling : store second register at word + 4 (or +8 for x86-64) */
2653 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2654 if (((ft & VT_BTYPE) == VT_QLONG) || ((ft & VT_BTYPE) == VT_QFLOAT)) {
2655 int addr_type = VT_LLONG, load_size = 8, load_type = ((vtop->type.t & VT_BTYPE) == VT_QLONG) ? VT_LLONG : VT_DOUBLE;
2656 #else
2657 if ((ft & VT_BTYPE) == VT_LLONG) {
2658 int addr_type = VT_INT, load_size = 4, load_type = VT_INT;
2659 #endif
2660 vtop[-1].type.t = load_type;
2661 store(r, vtop - 1);
2662 vswap();
2663 /* convert to int to increment easily */
2664 vtop->type.t = addr_type;
2665 gaddrof();
2666 vpushi(load_size);
2667 gen_op('+');
2668 vtop->r |= VT_LVAL;
2669 vswap();
2670 vtop[-1].type.t = load_type;
2671 /* XXX: it works because r2 is spilled last ! */
2672 store(vtop->r2, vtop - 1);
2673 } else {
2674 store(r, vtop - 1);
2675 }
2676 }
2677 vswap();
2678 vtop--; /* NOT vpop() because on x86 it would flush the fp stack */
2679 vtop->r |= delayed_cast;
2680 }
2681 }
2682
2683 /* post defines POST/PRE add. c is the token ++ or -- */
2684 ST_FUNC void inc(int post, int c)
2685 {
2686 test_lvalue();
2687 vdup(); /* save lvalue */
2688 if (post) {
2689 gv_dup(); /* duplicate value */
2690 vrotb(3);
2691 vrotb(3);
2692 }
2693 /* add constant */
2694 vpushi(c - TOK_MID);
2695 gen_op('+');
2696 vstore(); /* store value */
2697 if (post)
2698 vpop(); /* if post op, return saved value */
2699 }
2700
2701 /* Parse GNUC __attribute__ extension. Currently, the following
2702 extensions are recognized:
2703 - aligned(n) : set data/function alignment.
2704 - packed : force data alignment to 1
2705 - section(x) : generate data/code in this section.
2706 - unused : currently ignored, but may be used someday.
2707 - regparm(n) : pass function parameters in registers (i386 only)
2708 */
2709 static void parse_attribute(AttributeDef *ad)
2710 {
2711 int t, n;
2712
2713 while (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2) {
2714 next();
2715 skip('(');
2716 skip('(');
2717 while (tok != ')') {
2718 if (tok < TOK_IDENT)
2719 expect("attribute name");
2720 t = tok;
2721 next();
2722 switch(t) {
2723 case TOK_SECTION1:
2724 case TOK_SECTION2:
2725 skip('(');
2726 if (tok != TOK_STR)
2727 expect("section name");
2728 ad->section = find_section(tcc_state, (char *)tokc.cstr->data);
2729 next();
2730 skip(')');
2731 break;
2732 case TOK_ALIAS1:
2733 case TOK_ALIAS2:
2734 skip('(');
2735 if (tok != TOK_STR)
2736 expect("alias(\"target\")");
2737 ad->alias_target = /* save string as token, for later */
2738 tok_alloc((char*)tokc.cstr->data, tokc.cstr->size-1)->tok;
2739 next();
2740 skip(')');
2741 break;
2742 case TOK_VISIBILITY1:
2743 case TOK_VISIBILITY2:
2744 skip('(');
2745 if (tok != TOK_STR)
2746 expect("visibility(\"default|hidden|internal|protected\")");
2747 if (!strcmp (tokc.cstr->data, "default"))
2748 ad->a.visibility = STV_DEFAULT;
2749 else if (!strcmp (tokc.cstr->data, "hidden"))
2750 ad->a.visibility = STV_HIDDEN;
2751 else if (!strcmp (tokc.cstr->data, "internal"))
2752 ad->a.visibility = STV_INTERNAL;
2753 else if (!strcmp (tokc.cstr->data, "protected"))
2754 ad->a.visibility = STV_PROTECTED;
2755 else
2756 expect("visibility(\"default|hidden|internal|protected\")");
2757 next();
2758 skip(')');
2759 break;
2760 case TOK_ALIGNED1:
2761 case TOK_ALIGNED2:
2762 if (tok == '(') {
2763 next();
2764 n = expr_const();
2765 if (n <= 0 || (n & (n - 1)) != 0)
2766 tcc_error("alignment must be a positive power of two");
2767 skip(')');
2768 } else {
2769 n = MAX_ALIGN;
2770 }
2771 ad->a.aligned = n;
2772 break;
2773 case TOK_PACKED1:
2774 case TOK_PACKED2:
2775 ad->a.packed = 1;
2776 break;
2777 case TOK_WEAK1:
2778 case TOK_WEAK2:
2779 ad->a.weak = 1;
2780 break;
2781 case TOK_UNUSED1:
2782 case TOK_UNUSED2:
2783 /* currently, no need to handle it because tcc does not
2784 track unused objects */
2785 break;
2786 case TOK_NORETURN1:
2787 case TOK_NORETURN2:
2788 /* currently, no need to handle it because tcc does not
2789 track unused objects */
2790 break;
2791 case TOK_CDECL1:
2792 case TOK_CDECL2:
2793 case TOK_CDECL3:
2794 ad->a.func_call = FUNC_CDECL;
2795 break;
2796 case TOK_STDCALL1:
2797 case TOK_STDCALL2:
2798 case TOK_STDCALL3:
2799 ad->a.func_call = FUNC_STDCALL;
2800 break;
2801 #ifdef TCC_TARGET_I386
2802 case TOK_REGPARM1:
2803 case TOK_REGPARM2:
2804 skip('(');
2805 n = expr_const();
2806 if (n > 3)
2807 n = 3;
2808 else if (n < 0)
2809 n = 0;
2810 if (n > 0)
2811 ad->a.func_call = FUNC_FASTCALL1 + n - 1;
2812 skip(')');
2813 break;
2814 case TOK_FASTCALL1:
2815 case TOK_FASTCALL2:
2816 case TOK_FASTCALL3:
2817 ad->a.func_call = FUNC_FASTCALLW;
2818 break;
2819 #endif
2820 case TOK_MODE:
2821 skip('(');
2822 switch(tok) {
2823 case TOK_MODE_DI:
2824 ad->a.mode = VT_LLONG + 1;
2825 break;
2826 case TOK_MODE_HI:
2827 ad->a.mode = VT_SHORT + 1;
2828 break;
2829 case TOK_MODE_SI:
2830 ad->a.mode = VT_INT + 1;
2831 break;
2832 default:
2833 tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok, NULL));
2834 break;
2835 }
2836 next();
2837 skip(')');
2838 break;
2839 case TOK_DLLEXPORT:
2840 ad->a.func_export = 1;
2841 break;
2842 case TOK_DLLIMPORT:
2843 ad->a.func_import = 1;
2844 break;
2845 default:
2846 if (tcc_state->warn_unsupported)
2847 tcc_warning("'%s' attribute ignored", get_tok_str(t, NULL));
2848 /* skip parameters */
2849 if (tok == '(') {
2850 int parenthesis = 0;
2851 do {
2852 if (tok == '(')
2853 parenthesis++;
2854 else if (tok == ')')
2855 parenthesis--;
2856 next();
2857 } while (parenthesis && tok != -1);
2858 }
2859 break;
2860 }
2861 if (tok != ',')
2862 break;
2863 next();
2864 }
2865 skip(')');
2866 skip(')');
2867 }
2868 }
2869
2870 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
2871 static void struct_decl(CType *type, int u, int tdef)
2872 {
2873 int a, v, size, align, maxalign, c, offset, flexible;
2874 int bit_size, bit_pos, bsize, bt, lbit_pos, prevbt;
2875 Sym *s, *ss, *ass, **ps;
2876 AttributeDef ad;
2877 CType type1, btype;
2878
2879 a = tok; /* save decl type */
2880 next();
2881 if (tok != '{') {
2882 v = tok;
2883 next();
2884 /* struct already defined ? return it */
2885 if (v < TOK_IDENT)
2886 expect("struct/union/enum name");
2887 s = struct_find(v);
2888 if (s) {
2889 if (s->type.t != a)
2890 tcc_error("invalid type");
2891 goto do_decl;
2892 } else if (tok >= TOK_IDENT && !tdef)
2893 tcc_error("unknown struct/union/enum");
2894 } else {
2895 v = anon_sym++;
2896 }
2897 type1.t = a;
2898 type1.ref = NULL;
2899 /* we put an undefined size for struct/union */
2900 s = sym_push(v | SYM_STRUCT, &type1, 0, -1);
2901 s->r = 0; /* default alignment is zero as gcc */
2902 /* put struct/union/enum name in type */
2903 do_decl:
2904 type->t = u;
2905 type->ref = s;
2906
2907 if (tok == '{') {
2908 next();
2909 if (s->c != -1)
2910 tcc_error("struct/union/enum already defined");
2911 /* cannot be empty */
2912 c = 0;
2913 /* non empty enums are not allowed */
2914 if (a == TOK_ENUM) {
2915 for(;;) {
2916 v = tok;
2917 if (v < TOK_UIDENT)
2918 expect("identifier");
2919 ss = sym_find(v);
2920 if (ss && !local_stack)
2921 tcc_error("redefinition of enumerator '%s'",
2922 get_tok_str(v, NULL));
2923 next();
2924 if (tok == '=') {
2925 next();
2926 c = expr_const();
2927 }
2928 /* enum symbols have static storage */
2929 ss = sym_push(v, &int_type, VT_CONST, c);
2930 ss->type.t |= VT_STATIC;
2931 if (tok != ',')
2932 break;
2933 next();
2934 c++;
2935 /* NOTE: we accept a trailing comma */
2936 if (tok == '}')
2937 break;
2938 }
2939 s->c = type_size(&int_type, &align);
2940 skip('}');
2941 } else {
2942 maxalign = 1;
2943 ps = &s->next;
2944 prevbt = VT_INT;
2945 bit_pos = 0;
2946 offset = 0;
2947 flexible = 0;
2948 while (tok != '}') {
2949 parse_btype(&btype, &ad);
2950 while (1) {
2951 if (flexible)
2952 tcc_error("flexible array member '%s' not at the end of struct",
2953 get_tok_str(v, NULL));
2954 bit_size = -1;
2955 v = 0;
2956 type1 = btype;
2957 if (tok != ':') {
2958 type_decl(&type1, &ad, &v, TYPE_DIRECT | TYPE_ABSTRACT);
2959 if (v == 0 && (type1.t & VT_BTYPE) != VT_STRUCT)
2960 expect("identifier");
2961 if (type_size(&type1, &align) < 0) {
2962 if ((a == TOK_STRUCT) && (type1.t & VT_ARRAY) && c)
2963 flexible = 1;
2964 else
2965 tcc_error("field '%s' has incomplete type",
2966 get_tok_str(v, NULL));
2967 }
2968 if ((type1.t & VT_BTYPE) == VT_FUNC ||
2969 (type1.t & (VT_TYPEDEF | VT_STATIC | VT_EXTERN | VT_INLINE)))
2970 tcc_error("invalid type for '%s'",
2971 get_tok_str(v, NULL));
2972 }
2973 if (tok == ':') {
2974 next();
2975 bit_size = expr_const();
2976 /* XXX: handle v = 0 case for messages */
2977 if (bit_size < 0)
2978 tcc_error("negative width in bit-field '%s'",
2979 get_tok_str(v, NULL));
2980 if (v && bit_size == 0)
2981 tcc_error("zero width for bit-field '%s'",
2982 get_tok_str(v, NULL));
2983 }
2984 size = type_size(&type1, &align);
2985 if (ad.a.aligned) {
2986 if (align < ad.a.aligned)
2987 align = ad.a.aligned;
2988 } else if (ad.a.packed) {
2989 align = 1;
2990 } else if (*tcc_state->pack_stack_ptr) {
2991 if (align > *tcc_state->pack_stack_ptr)
2992 align = *tcc_state->pack_stack_ptr;
2993 }
2994 lbit_pos = 0;
2995 if (bit_size >= 0) {
2996 bt = type1.t & VT_BTYPE;
2997 if (bt != VT_INT &&
2998 bt != VT_BYTE &&
2999 bt != VT_SHORT &&
3000 bt != VT_BOOL &&
3001 bt != VT_ENUM &&
3002 bt != VT_LLONG)
3003 tcc_error("bitfields must have scalar type");
3004 bsize = size * 8;
3005 if (bit_size > bsize) {
3006 tcc_error("width of '%s' exceeds its type",
3007 get_tok_str(v, NULL));
3008 } else if (bit_size == bsize) {
3009 /* no need for bit fields */
3010 bit_pos = 0;
3011 } else if (bit_size == 0) {
3012 /* XXX: what to do if only padding in a
3013 structure ? */
3014 /* zero size: means to pad */
3015 bit_pos = 0;
3016 } else {
3017 /* we do not have enough room ?
3018 did the type change?
3019 is it a union? */
3020 if ((bit_pos + bit_size) > bsize ||
3021 bt != prevbt || a == TOK_UNION)
3022 bit_pos = 0;
3023 lbit_pos = bit_pos;
3024 /* XXX: handle LSB first */
3025 type1.t |= VT_BITFIELD |
3026 (bit_pos << VT_STRUCT_SHIFT) |
3027 (bit_size << (VT_STRUCT_SHIFT + 6));
3028 bit_pos += bit_size;
3029 }
3030 prevbt = bt;
3031 } else {
3032 bit_pos = 0;
3033 }
3034 if (v != 0 || (type1.t & VT_BTYPE) == VT_STRUCT) {
3035 /* add new memory data only if starting
3036 bit field */
3037 if (lbit_pos == 0) {
3038 if (a == TOK_STRUCT) {
3039 c = (c + align - 1) & -align;
3040 offset = c;
3041 if (size > 0)
3042 c += size;
3043 } else {
3044 offset = 0;
3045 if (size > c)
3046 c = size;
3047 }
3048 if (align > maxalign)
3049 maxalign = align;
3050 }
3051 #if 0
3052 printf("add field %s offset=%d",
3053 get_tok_str(v, NULL), offset);
3054 if (type1.t & VT_BITFIELD) {
3055 printf(" pos=%d size=%d",
3056 (type1.t >> VT_STRUCT_SHIFT) & 0x3f,
3057 (type1.t >> (VT_STRUCT_SHIFT + 6)) & 0x3f);
3058 }
3059 printf("\n");
3060 #endif
3061 }
3062 if (v == 0 && (type1.t & VT_BTYPE) == VT_STRUCT) {
3063 ass = type1.ref;
3064 while ((ass = ass->next) != NULL) {
3065 ss = sym_push(ass->v, &ass->type, 0, offset + ass->c);
3066 *ps = ss;
3067 ps = &ss->next;
3068 }
3069 } else if (v) {
3070 ss = sym_push(v | SYM_FIELD, &type1, 0, offset);
3071 *ps = ss;
3072 ps = &ss->next;
3073 }
3074 if (tok == ';' || tok == TOK_EOF)
3075 break;
3076 skip(',');
3077 }
3078 skip(';');
3079 }
3080 skip('}');
3081 /* store size and alignment */
3082 s->c = (c + maxalign - 1) & -maxalign;
3083 s->r = maxalign;
3084 }
3085 }
3086 }
3087
3088 /* return 1 if basic type is a type size (short, long, long long) */
3089 ST_FUNC int is_btype_size(int bt)
3090 {
3091 return bt == VT_SHORT || bt == VT_LONG || bt == VT_LLONG;
3092 }
3093
3094 /* return 0 if no type declaration. otherwise, return the basic type
3095 and skip it.
3096 */
3097 static int parse_btype(CType *type, AttributeDef *ad)
3098 {
3099 int t, u, bt_size, complete, type_found, typespec_found;
3100 Sym *s;
3101 CType type1;
3102
3103 memset(ad, 0, sizeof(AttributeDef));
3104 complete = 0;
3105 type_found = 0;
3106 typespec_found = 0;
3107 t = 0;
3108 while(1) {
3109 switch(tok) {
3110 case TOK_EXTENSION:
3111 /* currently, we really ignore extension */
3112 next();
3113 continue;
3114
3115 /* basic types */
3116 case TOK_CHAR:
3117 u = VT_BYTE;
3118 basic_type:
3119 next();
3120 basic_type1:
3121 if (complete)
3122 tcc_error("too many basic types");
3123 t |= u;
3124 bt_size = is_btype_size (u & VT_BTYPE);
3125 if (u == VT_INT || (!bt_size && !(t & VT_TYPEDEF)))
3126 complete = 1;
3127 typespec_found = 1;
3128 break;
3129 case TOK_VOID:
3130 u = VT_VOID;
3131 goto basic_type;
3132 case TOK_SHORT:
3133 u = VT_SHORT;
3134 goto basic_type;
3135 case TOK_INT:
3136 u = VT_INT;
3137 goto basic_type;
3138 case TOK_LONG:
3139 next();
3140 if ((t & VT_BTYPE) == VT_DOUBLE) {
3141 #ifndef TCC_TARGET_PE
3142 t = (t & ~VT_BTYPE) | VT_LDOUBLE;
3143 #endif
3144 } else if ((t & VT_BTYPE) == VT_LONG) {
3145 t = (t & ~VT_BTYPE) | VT_LLONG;
3146 } else {
3147 u = VT_LONG;
3148 goto basic_type1;
3149 }
3150 break;
3151 #ifdef TCC_TARGET_ARM64
3152 case TOK_UINT128:
3153 /* GCC's __uint128_t appears in some Linux header files. Make it a
3154 synonym for long double to get the size and alignment right. */
3155 u = VT_LDOUBLE;
3156 goto basic_type;
3157 #endif
3158 case TOK_BOOL:
3159 u = VT_BOOL;
3160 goto basic_type;
3161 case TOK_FLOAT:
3162 u = VT_FLOAT;
3163 goto basic_type;
3164 case TOK_DOUBLE:
3165 next();
3166 if ((t & VT_BTYPE) == VT_LONG) {
3167 #ifdef TCC_TARGET_PE
3168 t = (t & ~VT_BTYPE) | VT_DOUBLE;
3169 #else
3170 t = (t & ~VT_BTYPE) | VT_LDOUBLE;
3171 #endif
3172 } else {
3173 u = VT_DOUBLE;
3174 goto basic_type1;
3175 }
3176 break;
3177 case TOK_ENUM:
3178 struct_decl(&type1, VT_ENUM, t & (VT_TYPEDEF | VT_EXTERN));
3179 basic_type2:
3180 u = type1.t;
3181 type->ref = type1.ref;
3182 goto basic_type1;
3183 case TOK_STRUCT:
3184 case TOK_UNION:
3185 struct_decl(&type1, VT_STRUCT, t & (VT_TYPEDEF | VT_EXTERN));
3186 goto basic_type2;
3187
3188 /* type modifiers */
3189 case TOK_CONST1:
3190 case TOK_CONST2:
3191 case TOK_CONST3:
3192 t |= VT_CONSTANT;
3193 next();
3194 break;
3195 case TOK_VOLATILE1:
3196 case TOK_VOLATILE2:
3197 case TOK_VOLATILE3:
3198 t |= VT_VOLATILE;
3199 next();
3200 break;
3201 case TOK_SIGNED1:
3202 case TOK_SIGNED2:
3203 case TOK_SIGNED3:
3204 if ((t & (VT_DEFSIGN|VT_UNSIGNED)) == (VT_DEFSIGN|VT_UNSIGNED))
3205 tcc_error("signed and unsigned modifier");
3206 typespec_found = 1;
3207 t |= VT_DEFSIGN;
3208 next();
3209 break;
3210 case TOK_REGISTER:
3211 case TOK_AUTO:
3212 case TOK_RESTRICT1:
3213 case TOK_RESTRICT2:
3214 case TOK_RESTRICT3:
3215 next();
3216 break;
3217 case TOK_UNSIGNED:
3218 if ((t & (VT_DEFSIGN|VT_UNSIGNED)) == VT_DEFSIGN)
3219 tcc_error("signed and unsigned modifier");
3220 t |= VT_DEFSIGN | VT_UNSIGNED;
3221 next();
3222 typespec_found = 1;
3223 break;
3224
3225 /* storage */
3226 case TOK_EXTERN:
3227 t |= VT_EXTERN;
3228 next();
3229 break;
3230 case TOK_STATIC:
3231 t |= VT_STATIC;
3232 next();
3233 break;
3234 case TOK_TYPEDEF:
3235 t |= VT_TYPEDEF;
3236 next();
3237 break;
3238 case TOK_INLINE1:
3239 case TOK_INLINE2:
3240 case TOK_INLINE3:
3241 t |= VT_INLINE;
3242 next();
3243 break;
3244
3245 /* GNUC attribute */
3246 case TOK_ATTRIBUTE1:
3247 case TOK_ATTRIBUTE2:
3248 parse_attribute(ad);
3249 if (ad->a.mode) {
3250 u = ad->a.mode -1;
3251 t = (t & ~VT_BTYPE) | u;
3252 }
3253 break;
3254 /* GNUC typeof */
3255 case TOK_TYPEOF1:
3256 case TOK_TYPEOF2:
3257 case TOK_TYPEOF3:
3258 next();
3259 parse_expr_type(&type1);
3260 /* remove all storage modifiers except typedef */
3261 type1.t &= ~(VT_STORAGE&~VT_TYPEDEF);
3262 goto basic_type2;
3263 default:
3264 if (typespec_found)
3265 goto the_end;
3266 s = sym_find(tok);
3267 if (!s || !(s->type.t & VT_TYPEDEF))
3268 goto the_end;
3269 t |= (s->type.t & ~VT_TYPEDEF);
3270 type->ref = s->type.ref;
3271 if (s->r) {
3272 /* get attributes from typedef */
3273 if (0 == ad->a.aligned)
3274 ad->a.aligned = s->a.aligned;
3275 if (0 == ad->a.func_call)
3276 ad->a.func_call = s->a.func_call;
3277 ad->a.packed |= s->a.packed;
3278 }
3279 next();
3280 typespec_found = 1;
3281 break;
3282 }
3283 type_found = 1;
3284 }
3285 the_end:
3286 if (tcc_state->char_is_unsigned) {
3287 if ((t & (VT_DEFSIGN|VT_BTYPE)) == VT_BYTE)
3288 t |= VT_UNSIGNED;
3289 }
3290
3291 /* long is never used as type */
3292 if ((t & VT_BTYPE) == VT_LONG)
3293 #if (!defined TCC_TARGET_X86_64 && !defined TCC_TARGET_ARM64) || \
3294 defined TCC_TARGET_PE
3295 t = (t & ~VT_BTYPE) | VT_INT;
3296 #else
3297 t = (t & ~VT_BTYPE) | VT_LLONG;
3298 #endif
3299 type->t = t;
3300 return type_found;
3301 }
3302
3303 /* convert a function parameter type (array to pointer and function to
3304 function pointer) */
3305 static inline void convert_parameter_type(CType *pt)
3306 {
3307 /* remove const and volatile qualifiers (XXX: const could be used
3308 to indicate a const function parameter */
3309 pt->t &= ~(VT_CONSTANT | VT_VOLATILE);
3310 /* array must be transformed to pointer according to ANSI C */
3311 pt->t &= ~VT_ARRAY;
3312 if ((pt->t & VT_BTYPE) == VT_FUNC) {
3313 mk_pointer(pt);
3314 }
3315 }
3316
3317 ST_FUNC void parse_asm_str(CString *astr)
3318 {
3319 skip('(');
3320 /* read the string */
3321 if (tok != TOK_STR)
3322 expect("string constant");
3323 cstr_new(astr);
3324 while (tok == TOK_STR) {
3325 /* XXX: add \0 handling too ? */
3326 cstr_cat(astr, tokc.cstr->data);
3327 next();
3328 }
3329 cstr_ccat(astr, '\0');
3330 }
3331
3332 /* Parse an asm label and return the label
3333 * Don't forget to free the CString in the caller! */
3334 static void asm_label_instr(CString *astr)
3335 {
3336 next();
3337 parse_asm_str(astr);
3338 skip(')');
3339 #ifdef ASM_DEBUG
3340 printf("asm_alias: \"%s\"\n", (char *)astr->data);
3341 #endif
3342 }
3343
3344 static void post_type(CType *type, AttributeDef *ad)
3345 {
3346 int n, l, t1, arg_size, align;
3347 Sym **plast, *s, *first;
3348 AttributeDef ad1;
3349 CType pt;
3350
3351 if (tok == '(') {
3352 /* function declaration */
3353 next();
3354 l = 0;
3355 first = NULL;
3356 plast = &first;
3357 arg_size = 0;
3358 if (tok != ')') {
3359 for(;;) {
3360 /* read param name and compute offset */
3361 if (l != FUNC_OLD) {
3362 if (!parse_btype(&pt, &ad1)) {
3363 if (l) {
3364 tcc_error("invalid type");
3365 } else {
3366 l = FUNC_OLD;
3367 goto old_proto;
3368 }
3369 }
3370 l = FUNC_NEW;
3371 if ((pt.t & VT_BTYPE) == VT_VOID && tok == ')')
3372 break;
3373 type_decl(&pt, &ad1, &n, TYPE_DIRECT | TYPE_ABSTRACT);
3374 if ((pt.t & VT_BTYPE) == VT_VOID)
3375 tcc_error("parameter declared as void");
3376 arg_size += (type_size(&pt, &align) + PTR_SIZE - 1) / PTR_SIZE;
3377 } else {
3378 old_proto:
3379 n = tok;
3380 if (n < TOK_UIDENT)
3381 expect("identifier");
3382 pt.t = VT_INT;
3383 next();
3384 }
3385 convert_parameter_type(&pt);
3386 s = sym_push(n | SYM_FIELD, &pt, 0, 0);
3387 *plast = s;
3388 plast = &s->next;
3389 if (tok == ')')
3390 break;
3391 skip(',');
3392 if (l == FUNC_NEW && tok == TOK_DOTS) {
3393 l = FUNC_ELLIPSIS;
3394 next();
3395 break;
3396 }
3397 }
3398 }
3399 /* if no parameters, then old type prototype */
3400 if (l == 0)
3401 l = FUNC_OLD;
3402 skip(')');
3403 /* NOTE: const is ignored in returned type as it has a special
3404 meaning in gcc / C++ */
3405 type->t &= ~VT_CONSTANT;
3406 /* some ancient pre-K&R C allows a function to return an array
3407 and the array brackets to be put after the arguments, such
3408 that "int c()[]" means something like "int[] c()" */
3409 if (tok == '[') {
3410 next();
3411 skip(']'); /* only handle simple "[]" */
3412 type->t |= VT_PTR;
3413 }
3414 /* we push a anonymous symbol which will contain the function prototype */
3415 ad->a.func_args = arg_size;
3416 s = sym_push(SYM_FIELD, type, 0, l);
3417 s->a = ad->a;
3418 s->next = first;
3419 type->t = VT_FUNC;
3420 type->ref = s;
3421 } else if (tok == '[') {
3422 /* array definition */
3423 next();
3424 if (tok == TOK_RESTRICT1)
3425 next();
3426 n = -1;
3427 t1 = 0;
3428 if (tok != ']') {
3429 if (!local_stack || nocode_wanted)
3430 vpushi(expr_const());
3431 else gexpr();
3432 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
3433 n = vtop->c.i;
3434 if (n < 0)
3435 tcc_error("invalid array size");
3436 } else {
3437 if (!is_integer_btype(vtop->type.t & VT_BTYPE))
3438 tcc_error("size of variable length array should be an integer");
3439 t1 = VT_VLA;
3440 }
3441 }
3442 skip(']');
3443 /* parse next post type */
3444 post_type(type, ad);
3445 if (type->t == VT_FUNC)
3446 tcc_error("declaration of an array of functions");
3447 t1 |= type->t & VT_VLA;
3448
3449 if (t1 & VT_VLA) {
3450 loc -= type_size(&int_type, &align);
3451 loc &= -align;
3452 n = loc;
3453
3454 vla_runtime_type_size(type, &align);
3455 gen_op('*');
3456 vset(&int_type, VT_LOCAL|VT_LVAL, loc);
3457 vswap();
3458 vstore();
3459 }
3460 if (n != -1)
3461 vpop();
3462
3463 /* we push an anonymous symbol which will contain the array
3464 element type */
3465 s = sym_push(SYM_FIELD, type, 0, n);
3466 type->t = (t1 ? VT_VLA : VT_ARRAY) | VT_PTR;
3467 type->ref = s;
3468 }
3469 }
3470
3471 /* Parse a type declaration (except basic type), and return the type
3472 in 'type'. 'td' is a bitmask indicating which kind of type decl is
3473 expected. 'type' should contain the basic type. 'ad' is the
3474 attribute definition of the basic type. It can be modified by
3475 type_decl().
3476 */
3477 static void type_decl(CType *type, AttributeDef *ad, int *v, int td)
3478 {
3479 Sym *s;
3480 CType type1, *type2;
3481 int qualifiers, storage;
3482
3483 while (tok == '*') {
3484 qualifiers = 0;
3485 redo:
3486 next();
3487 switch(tok) {
3488 case TOK_CONST1:
3489 case TOK_CONST2:
3490 case TOK_CONST3:
3491 qualifiers |= VT_CONSTANT;
3492 goto redo;
3493 case TOK_VOLATILE1:
3494 case TOK_VOLATILE2:
3495 case TOK_VOLATILE3:
3496 qualifiers |= VT_VOLATILE;
3497 goto redo;
3498 case TOK_RESTRICT1:
3499 case TOK_RESTRICT2:
3500 case TOK_RESTRICT3:
3501 goto redo;
3502 }
3503 mk_pointer(type);
3504 type->t |= qualifiers;
3505 }
3506
3507 /* XXX: clarify attribute handling */
3508 if (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2)
3509 parse_attribute(ad);
3510
3511 /* recursive type */
3512 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
3513 type1.t = 0; /* XXX: same as int */
3514 if (tok == '(') {
3515 next();
3516 /* XXX: this is not correct to modify 'ad' at this point, but
3517 the syntax is not clear */
3518 if (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2)
3519 parse_attribute(ad);
3520 type_decl(&type1, ad, v, td);
3521 skip(')');
3522 } else {
3523 /* type identifier */
3524 if (tok >= TOK_IDENT && (td & TYPE_DIRECT)) {
3525 *v = tok;
3526 next();
3527 } else {
3528 if (!(td & TYPE_ABSTRACT))
3529 expect("identifier");
3530 *v = 0;
3531 }
3532 }
3533 storage = type->t & VT_STORAGE;
3534 type->t &= ~VT_STORAGE;
3535 if (storage & VT_STATIC) {
3536 int saved_nocode_wanted = nocode_wanted;
3537 nocode_wanted = 1;
3538 post_type(type, ad);
3539 nocode_wanted = saved_nocode_wanted;
3540 } else
3541 post_type(type, ad);
3542 type->t |= storage;
3543 if (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2)
3544 parse_attribute(ad);
3545
3546 if (!type1.t)
3547 return;
3548 /* append type at the end of type1 */
3549 type2 = &type1;
3550 for(;;) {
3551 s = type2->ref;
3552 type2 = &s->type;
3553 if (!type2->t) {
3554 *type2 = *type;
3555 break;
3556 }
3557 }
3558 *type = type1;
3559 }
3560
3561 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
3562 ST_FUNC int lvalue_type(int t)
3563 {
3564 int bt, r;
3565 r = VT_LVAL;
3566 bt = t & VT_BTYPE;
3567 if (bt == VT_BYTE || bt == VT_BOOL)
3568 r |= VT_LVAL_BYTE;
3569 else if (bt == VT_SHORT)
3570 r |= VT_LVAL_SHORT;
3571 else
3572 return r;
3573 if (t & VT_UNSIGNED)
3574 r |= VT_LVAL_UNSIGNED;
3575 return r;
3576 }
3577
3578 /* indirection with full error checking and bound check */
3579 ST_FUNC void indir(void)
3580 {
3581 if ((vtop->type.t & VT_BTYPE) != VT_PTR) {
3582 if ((vtop->type.t & VT_BTYPE) == VT_FUNC)
3583 return;
3584 expect("pointer");
3585 }
3586 if ((vtop->r & VT_LVAL) && !nocode_wanted)
3587 gv(RC_INT);
3588 vtop->type = *pointed_type(&vtop->type);
3589 /* Arrays and functions are never lvalues */
3590 if (!(vtop->type.t & VT_ARRAY) && !(vtop->type.t & VT_VLA)
3591 && (vtop->type.t & VT_BTYPE) != VT_FUNC) {
3592 vtop->r |= lvalue_type(vtop->type.t);
3593 /* if bound checking, the referenced pointer must be checked */
3594 #ifdef CONFIG_TCC_BCHECK
3595 if (tcc_state->do_bounds_check)
3596 vtop->r |= VT_MUSTBOUND;
3597 #endif
3598 }
3599 }
3600
3601 /* pass a parameter to a function and do type checking and casting */
3602 static void gfunc_param_typed(Sym *func, Sym *arg)
3603 {
3604 int func_type;
3605 CType type;
3606
3607 func_type = func->c;
3608 if (func_type == FUNC_OLD ||
3609 (func_type == FUNC_ELLIPSIS && arg == NULL)) {
3610 /* default casting : only need to convert float to double */
3611 if ((vtop->type.t & VT_BTYPE) == VT_FLOAT) {
3612 type.t = VT_DOUBLE;
3613 gen_cast(&type);
3614 } else if (vtop->type.t & VT_BITFIELD) {
3615 type.t = vtop->type.t & (VT_BTYPE | VT_UNSIGNED);
3616 gen_cast(&type);
3617 }
3618 } else if (arg == NULL) {
3619 tcc_error("too many arguments to function");
3620 } else {
3621 type = arg->type;
3622 type.t &= ~VT_CONSTANT; /* need to do that to avoid false warning */
3623 gen_assign_cast(&type);
3624 }
3625 }
3626
3627 /* parse an expression of the form '(type)' or '(expr)' and return its
3628 type */
3629 static void parse_expr_type(CType *type)
3630 {
3631 int n;
3632 AttributeDef ad;
3633
3634 skip('(');
3635 if (parse_btype(type, &ad)) {
3636 type_decl(type, &ad, &n, TYPE_ABSTRACT);
3637 } else {
3638 expr_type(type);
3639 }
3640 skip(')');
3641 }
3642
3643 static void parse_type(CType *type)
3644 {
3645 AttributeDef ad;
3646 int n;
3647
3648 if (!parse_btype(type, &ad)) {
3649 expect("type");
3650 }
3651 type_decl(type, &ad, &n, TYPE_ABSTRACT);
3652 }
3653
3654 static void vpush_tokc(int t)
3655 {
3656 CType type;
3657 type.t = t;
3658 type.ref = 0;
3659 vsetc(&type, VT_CONST, &tokc);
3660 }
3661
3662 ST_FUNC void unary(void)
3663 {
3664 int n, t, align, size, r, sizeof_caller;
3665 CType type;
3666 Sym *s;
3667 AttributeDef ad;
3668 static int in_sizeof = 0;
3669
3670 sizeof_caller = in_sizeof;
3671 in_sizeof = 0;
3672 /* XXX: GCC 2.95.3 does not generate a table although it should be
3673 better here */
3674 tok_next:
3675 switch(tok) {
3676 case TOK_EXTENSION:
3677 next();
3678 goto tok_next;
3679 case TOK_CINT:
3680 case TOK_CCHAR:
3681 case TOK_LCHAR:
3682 vpushi(tokc.i);
3683 next();
3684 break;
3685 case TOK_CUINT:
3686 vpush_tokc(VT_INT | VT_UNSIGNED);
3687 next();
3688 break;
3689 case TOK_CLLONG:
3690 vpush_tokc(VT_LLONG);
3691 next();
3692 break;
3693 case TOK_CULLONG:
3694 vpush_tokc(VT_LLONG | VT_UNSIGNED);
3695 next();
3696 break;
3697 case TOK_CFLOAT:
3698 vpush_tokc(VT_FLOAT);
3699 next();
3700 break;
3701 case TOK_CDOUBLE:
3702 vpush_tokc(VT_DOUBLE);
3703 next();
3704 break;
3705 case TOK_CLDOUBLE:
3706 vpush_tokc(VT_LDOUBLE);
3707 next();
3708 break;
3709 case TOK___FUNCTION__:
3710 if (!gnu_ext)
3711 goto tok_identifier;
3712 /* fall thru */
3713 case TOK___FUNC__:
3714 {
3715 void *ptr;
3716 int len;
3717 /* special function name identifier */
3718 len = strlen(funcname) + 1;
3719 /* generate char[len] type */
3720 type.t = VT_BYTE;
3721 mk_pointer(&type);
3722 type.t |= VT_ARRAY;
3723 type.ref->c = len;
3724 vpush_ref(&type, data_section, data_section->data_offset, len);
3725 ptr = section_ptr_add(data_section, len);
3726 memcpy(ptr, funcname, len);
3727 next();
3728 }
3729 break;
3730 case TOK_LSTR:
3731 #ifdef TCC_TARGET_PE
3732 t = VT_SHORT | VT_UNSIGNED;
3733 #else
3734 t = VT_INT;
3735 #endif
3736 goto str_init;
3737 case TOK_STR:
3738 /* string parsing */
3739 t = VT_BYTE;
3740 str_init:
3741 if (tcc_state->warn_write_strings)
3742 t |= VT_CONSTANT;
3743 type.t = t;
3744 mk_pointer(&type);
3745 type.t |= VT_ARRAY;
3746 memset(&ad, 0, sizeof(AttributeDef));
3747 decl_initializer_alloc(&type, &ad, VT_CONST, 2, 0, NULL, 0);
3748 break;
3749 case '(':
3750 next();
3751 /* cast ? */
3752 if (parse_btype(&type, &ad)) {
3753 type_decl(&type, &ad, &n, TYPE_ABSTRACT);
3754 skip(')');
3755 /* check ISOC99 compound literal */
3756 if (tok == '{') {
3757 /* data is allocated locally by default */
3758 if (global_expr)
3759 r = VT_CONST;
3760 else
3761 r = VT_LOCAL;
3762 /* all except arrays are lvalues */
3763 if (!(type.t & VT_ARRAY))
3764 r |= lvalue_type(type.t);
3765 memset(&ad, 0, sizeof(AttributeDef));
3766 decl_initializer_alloc(&type, &ad, r, 1, 0, NULL, 0);
3767 } else {
3768 if (sizeof_caller) {
3769 vpush(&type);
3770 return;
3771 }
3772 unary();
3773 gen_cast(&type);
3774 }
3775 } else if (tok == '{') {
3776 /* save all registers */
3777 save_regs(0);
3778 /* statement expression : we do not accept break/continue
3779 inside as GCC does */
3780 block(NULL, NULL, NULL, NULL, 0, 1);
3781 skip(')');
3782 } else {
3783 gexpr();
3784 skip(')');
3785 }
3786 break;
3787 case '*':
3788 next();
3789 unary();
3790 indir();
3791 break;
3792 case '&':
3793 next();
3794 unary();
3795 /* functions names must be treated as function pointers,
3796 except for unary '&' and sizeof. Since we consider that
3797 functions are not lvalues, we only have to handle it
3798 there and in function calls. */
3799 /* arrays can also be used although they are not lvalues */
3800 if ((vtop->type.t & VT_BTYPE) != VT_FUNC &&
3801 !(vtop->type.t & VT_ARRAY) && !(vtop->type.t & VT_LLOCAL))
3802 test_lvalue();
3803 mk_pointer(&vtop->type);
3804 gaddrof();
3805 break;
3806 case '!':
3807 next();
3808 unary();
3809 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
3810 CType boolean;
3811 boolean.t = VT_BOOL;
3812 gen_cast(&boolean);
3813 vtop->c.i = !vtop->c.i;
3814 } else if ((vtop->r & VT_VALMASK) == VT_CMP)
3815 vtop->c.i = vtop->c.i ^ 1;
3816 else {
3817 save_regs(1);
3818 vseti(VT_JMP, gvtst(1, 0));
3819 }
3820 break;
3821 case '~':
3822 next();
3823 unary();
3824 vpushi(-1);
3825 gen_op('^');
3826 break;
3827 case '+':
3828 next();
3829 unary();
3830 if ((vtop->type.t & VT_BTYPE) == VT_PTR)
3831 tcc_error("pointer not accepted for unary plus");
3832 /* In order to force cast, we add zero, except for floating point
3833 where we really need an noop (otherwise -0.0 will be transformed
3834 into +0.0). */
3835 if (!is_float(vtop->type.t)) {
3836 vpushi(0);
3837 gen_op('+');
3838 }
3839 break;
3840 case TOK_SIZEOF:
3841 case TOK_ALIGNOF1:
3842 case TOK_ALIGNOF2:
3843 t = tok;
3844 next();
3845 in_sizeof++;
3846 unary_type(&type); // Perform a in_sizeof = 0;
3847 size = type_size(&type, &align);
3848 if (t == TOK_SIZEOF) {
3849 if (!(type.t & VT_VLA)) {
3850 if (size < 0)
3851 tcc_error("sizeof applied to an incomplete type");
3852 vpushs(size);
3853 } else {
3854 vla_runtime_type_size(&type, &align);
3855 }
3856 } else {
3857 vpushs(align);
3858 }
3859 vtop->type.t |= VT_UNSIGNED;
3860 break;
3861
3862 case TOK_builtin_types_compatible_p:
3863 {
3864 CType type1, type2;
3865 next();
3866 skip('(');
3867 parse_type(&type1);
3868 skip(',');
3869 parse_type(&type2);
3870 skip(')');
3871 type1.t &= ~(VT_CONSTANT | VT_VOLATILE);
3872 type2.t &= ~(VT_CONSTANT | VT_VOLATILE);
3873 vpushi(is_compatible_types(&type1, &type2));
3874 }
3875 break;
3876 case TOK_builtin_constant_p:
3877 {
3878 int saved_nocode_wanted, res;
3879 next();
3880 skip('(');
3881 saved_nocode_wanted = nocode_wanted;
3882 nocode_wanted = 1;
3883 gexpr();
3884 res = (vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
3885 vpop();
3886 nocode_wanted = saved_nocode_wanted;
3887 skip(')');
3888 vpushi(res);
3889 }
3890 break;
3891 case TOK_builtin_frame_address:
3892 case TOK_builtin_return_address:
3893 {
3894 int tok1 = tok;
3895 int level;
3896 CType type;
3897 next();
3898 skip('(');
3899 if (tok != TOK_CINT || tokc.i < 0) {
3900 tcc_error("%s only takes positive integers",
3901 tok1 == TOK_builtin_return_address ?
3902 "__builtin_return_address" :
3903 "__builtin_frame_address");
3904 }
3905 level = tokc.i;
3906 next();
3907 skip(')');
3908 type.t = VT_VOID;
3909 mk_pointer(&type);
3910 vset(&type, VT_LOCAL, 0); /* local frame */
3911 while (level--) {
3912 mk_pointer(&vtop->type);
3913 indir(); /* -> parent frame */
3914 }
3915 if (tok1 == TOK_builtin_return_address) {
3916 // assume return address is just above frame pointer on stack
3917 vpushi(PTR_SIZE);
3918 gen_op('+');
3919 mk_pointer(&vtop->type);
3920 indir();
3921 }
3922 }
3923 break;
3924 #ifdef TCC_TARGET_X86_64
3925 #ifdef TCC_TARGET_PE
3926 case TOK_builtin_va_start:
3927 {
3928 next();
3929 skip('(');
3930 expr_eq();
3931 skip(',');
3932 expr_eq();
3933 skip(')');
3934 if ((vtop->r & VT_VALMASK) != VT_LOCAL)
3935 tcc_error("__builtin_va_start expects a local variable");
3936 vtop->r &= ~(VT_LVAL | VT_REF);
3937 vtop->type = char_pointer_type;
3938 vstore();
3939 }
3940 break;
3941 #else
3942 case TOK_builtin_va_arg_types:
3943 {
3944 CType type;
3945 next();
3946 skip('(');
3947 parse_type(&type);
3948 skip(')');
3949 vpushi(classify_x86_64_va_arg(&type));
3950 }
3951 break;
3952 #endif
3953 #endif
3954
3955 #ifdef TCC_TARGET_ARM64
3956 case TOK___va_start: {
3957 next();
3958 skip('(');
3959 expr_eq();
3960 skip(',');
3961 expr_eq();
3962 skip(')');
3963 //xx check types
3964 gen_va_start();
3965 vpushi(0);
3966 vtop->type.t = VT_VOID;
3967 break;
3968 }
3969 case TOK___va_arg: {
3970 CType type;
3971 next();
3972 skip('(');
3973 expr_eq();
3974 skip(',');
3975 parse_type(&type);
3976 skip(')');
3977 //xx check types
3978 gen_va_arg(&type);
3979 vtop->type = type;
3980 break;
3981 }
3982 #endif
3983
3984 case TOK_INC:
3985 case TOK_DEC:
3986 t = tok;
3987 next();
3988 unary();
3989 inc(0, t);
3990 break;
3991 case '-':
3992 next();
3993 unary();
3994 t = vtop->type.t & VT_BTYPE;
3995 if (is_float(t)) {
3996 /* In IEEE negate(x) isn't subtract(0,x), but rather
3997 subtract(-0, x). */
3998 vpush(&vtop->type);
3999 if (t == VT_FLOAT)
4000 vtop->c.f = -0.0f;
4001 else if (t == VT_DOUBLE)
4002 vtop->c.d = -0.0;
4003 else
4004 vtop->c.ld = -0.0;
4005 } else
4006 vpushi(0);
4007 vswap();
4008 gen_op('-');
4009 break;
4010 case TOK_LAND:
4011 if (!gnu_ext)
4012 goto tok_identifier;
4013 next();
4014 /* allow to take the address of a label */
4015 if (tok < TOK_UIDENT)
4016 expect("label identifier");
4017 s = label_find(tok);
4018 if (!s) {
4019 s = label_push(&global_label_stack, tok, LABEL_FORWARD);
4020 } else {
4021 if (s->r == LABEL_DECLARED)
4022 s->r = LABEL_FORWARD;
4023 }
4024 if (!s->type.t) {
4025 s->type.t = VT_VOID;
4026 mk_pointer(&s->type);
4027 s->type.t |= VT_STATIC;
4028 }
4029 vpushsym(&s->type, s);
4030 next();
4031 break;
4032
4033 // special qnan , snan and infinity values
4034 case TOK___NAN__:
4035 vpush64(VT_DOUBLE, 0x7ff8000000000000ULL);
4036 next();
4037 break;
4038 case TOK___SNAN__:
4039 vpush64(VT_DOUBLE, 0x7ff0000000000001ULL);
4040 next();
4041 break;
4042 case TOK___INF__:
4043 vpush64(VT_DOUBLE, 0x7ff0000000000000ULL);
4044 next();
4045 break;
4046
4047 default:
4048 tok_identifier:
4049 t = tok;
4050 next();
4051 if (t < TOK_UIDENT)
4052 expect("identifier");
4053 s = sym_find(t);
4054 if (!s) {
4055 const char *name = get_tok_str(t, NULL);
4056 if (tok != '(')
4057 tcc_error("'%s' undeclared", name);
4058 /* for simple function calls, we tolerate undeclared
4059 external reference to int() function */
4060 if (tcc_state->warn_implicit_function_declaration
4061 #ifdef TCC_TARGET_PE
4062 /* people must be warned about using undeclared WINAPI functions
4063 (which usually start with uppercase letter) */
4064 || (name[0] >= 'A' && name[0] <= 'Z')
4065 #endif
4066 )
4067 tcc_warning("implicit declaration of function '%s'", name);
4068 s = external_global_sym(t, &func_old_type, 0);
4069 }
4070 if ((s->type.t & (VT_STATIC | VT_INLINE | VT_BTYPE)) ==
4071 (VT_STATIC | VT_INLINE | VT_FUNC)) {
4072 /* if referencing an inline function, then we generate a
4073 symbol to it if not already done. It will have the
4074 effect to generate code for it at the end of the
4075 compilation unit. Inline function as always
4076 generated in the text section. */
4077 if (!s->c)
4078 put_extern_sym(s, text_section, 0, 0);
4079 r = VT_SYM | VT_CONST;
4080 } else {
4081 r = s->r;
4082 }
4083 vset(&s->type, r, s->c);
4084 /* if forward reference, we must point to s */
4085 if (vtop->r & VT_SYM) {
4086 vtop->sym = s;
4087 vtop->c.ptr_offset = 0;
4088 }
4089 break;
4090 }
4091
4092 /* post operations */
4093 while (1) {
4094 if (tok == TOK_INC || tok == TOK_DEC) {
4095 inc(1, tok);
4096 next();
4097 } else if (tok == '.' || tok == TOK_ARROW) {
4098 int qualifiers;
4099 /* field */
4100 if (tok == TOK_ARROW)
4101 indir();
4102 qualifiers = vtop->type.t & (VT_CONSTANT | VT_VOLATILE);
4103 test_lvalue();
4104 gaddrof();
4105 next();
4106 /* expect pointer on structure */
4107 if ((vtop->type.t & VT_BTYPE) != VT_STRUCT)
4108 expect("struct or union");
4109 s = vtop->type.ref;
4110 /* find field */
4111 tok |= SYM_FIELD;
4112 while ((s = s->next) != NULL) {
4113 if (s->v == tok)
4114 break;
4115 }
4116 if (!s)
4117 tcc_error("field not found: %s", get_tok_str(tok & ~SYM_FIELD, NULL));
4118 /* add field offset to pointer */
4119 vtop->type = char_pointer_type; /* change type to 'char *' */
4120 vpushi(s->c);
4121 gen_op('+');
4122 /* change type to field type, and set to lvalue */
4123 vtop->type = s->type;
4124 vtop->type.t |= qualifiers;
4125 /* an array is never an lvalue */
4126 if (!(vtop->type.t & VT_ARRAY)) {
4127 vtop->r |= lvalue_type(vtop->type.t);
4128 #ifdef CONFIG_TCC_BCHECK
4129 /* if bound checking, the referenced pointer must be checked */
4130 if (tcc_state->do_bounds_check)
4131 vtop->r |= VT_MUSTBOUND;
4132 #endif
4133 }
4134 next();
4135 } else if (tok == '[') {
4136 next();
4137 gexpr();
4138 gen_op('+');
4139 indir();
4140 skip(']');
4141 } else if (tok == '(') {
4142 SValue ret;
4143 Sym *sa;
4144 int nb_args, ret_nregs, ret_align, variadic;
4145
4146 /* function call */
4147 if ((vtop->type.t & VT_BTYPE) != VT_FUNC) {
4148 /* pointer test (no array accepted) */
4149 if ((vtop->type.t & (VT_BTYPE | VT_ARRAY)) == VT_PTR) {
4150 vtop->type = *pointed_type(&vtop->type);
4151 if ((vtop->type.t & VT_BTYPE) != VT_FUNC)
4152 goto error_func;
4153 } else {
4154 error_func:
4155 expect("function pointer");
4156 }
4157 } else {
4158 vtop->r &= ~VT_LVAL; /* no lvalue */
4159 }
4160 /* get return type */
4161 s = vtop->type.ref;
4162 next();
4163 sa = s->next; /* first parameter */
4164 nb_args = 0;
4165 ret.r2 = VT_CONST;
4166 /* compute first implicit argument if a structure is returned */
4167 if ((s->type.t & VT_BTYPE) == VT_STRUCT) {
4168 variadic = (s->c == FUNC_ELLIPSIS);
4169 ret_nregs = gfunc_sret(&s->type, variadic, &ret.type,
4170 &ret_align);
4171 if (!ret_nregs) {
4172 /* get some space for the returned structure */
4173 size = type_size(&s->type, &align);
4174 #ifdef TCC_TARGET_ARM64
4175 /* On arm64, a small struct is return in registers.
4176 It is much easier to write it to memory if we know
4177 that we are allowed to write some extra bytes, so
4178 round the allocated space up to a power of 2: */
4179 if (size < 16)
4180 while (size & (size - 1))
4181 size = (size | (size - 1)) + 1;
4182 #endif
4183 loc = (loc - size) & -align;
4184 ret.type = s->type;
4185 ret.r = VT_LOCAL | VT_LVAL;
4186 /* pass it as 'int' to avoid structure arg passing
4187 problems */
4188 vseti(VT_LOCAL, loc);
4189 ret.c = vtop->c;
4190 nb_args++;
4191 }
4192 } else {
4193 ret_nregs = 1;
4194 ret.type = s->type;
4195 }
4196
4197 if (ret_nregs) {
4198 /* return in register */
4199 if (is_float(ret.type.t)) {
4200 ret.r = reg_fret(ret.type.t);
4201 #ifdef TCC_TARGET_X86_64
4202 if ((ret.type.t & VT_BTYPE) == VT_QFLOAT)
4203 ret.r2 = REG_QRET;
4204 #endif
4205 } else {
4206 #ifndef TCC_TARGET_ARM64
4207 #ifdef TCC_TARGET_X86_64
4208 if ((ret.type.t & VT_BTYPE) == VT_QLONG)
4209 #else
4210 if ((ret.type.t & VT_BTYPE) == VT_LLONG)
4211 #endif
4212 ret.r2 = REG_LRET;
4213 #endif
4214 ret.r = REG_IRET;
4215 }
4216 ret.c.i = 0;
4217 }
4218 if (tok != ')') {
4219 for(;;) {
4220 expr_eq();
4221 gfunc_param_typed(s, sa);
4222 nb_args++;
4223 if (sa)
4224 sa = sa->next;
4225 if (tok == ')')
4226 break;
4227 skip(',');
4228 }
4229 }
4230 if (sa)
4231 tcc_error("too few arguments to function");
4232 skip(')');
4233 if (!nocode_wanted) {
4234 gfunc_call(nb_args);
4235 } else {
4236 vtop -= (nb_args + 1);
4237 }
4238
4239 /* return value */
4240 for (r = ret.r + ret_nregs + !ret_nregs; r-- > ret.r;) {
4241 vsetc(&ret.type, r, &ret.c);
4242 vtop->r2 = ret.r2; /* Loop only happens when r2 is VT_CONST */
4243 }
4244
4245 /* handle packed struct return */
4246 if (((s->type.t & VT_BTYPE) == VT_STRUCT) && ret_nregs) {
4247 int addr, offset;
4248
4249 size = type_size(&s->type, &align);
4250 loc = (loc - size) & -align;
4251 addr = loc;
4252 offset = 0;
4253 for (;;) {
4254 vset(&ret.type, VT_LOCAL | VT_LVAL, addr + offset);
4255 vswap();
4256 vstore();
4257 vtop--;
4258 if (--ret_nregs == 0)
4259 break;
4260 /* XXX: compatible with arm only: ret_align == register_size */
4261 offset += ret_align;
4262 }
4263 vset(&s->type, VT_LOCAL | VT_LVAL, addr);
4264 }
4265 } else {
4266 break;
4267 }
4268 }
4269 }
4270
4271 ST_FUNC void expr_prod(void)
4272 {
4273 int t;
4274
4275 unary();
4276 while (tok == '*' || tok == '/' || tok == '%') {
4277 t = tok;
4278 next();
4279 unary();
4280 gen_op(t);
4281 }
4282 }
4283
4284 ST_FUNC void expr_sum(void)
4285 {
4286 int t;
4287
4288 expr_prod();
4289 while (tok == '+' || tok == '-') {
4290 t = tok;
4291 next();
4292 expr_prod();
4293 gen_op(t);
4294 }
4295 }
4296
4297 static void expr_shift(void)
4298 {
4299 int t;
4300
4301 expr_sum();
4302 while (tok == TOK_SHL || tok == TOK_SAR) {
4303 t = tok;
4304 next();
4305 expr_sum();
4306 gen_op(t);
4307 }
4308 }
4309
4310 static void expr_cmp(void)
4311 {
4312 int t;
4313
4314 expr_shift();
4315 while ((tok >= TOK_ULE && tok <= TOK_GT) ||
4316 tok == TOK_ULT || tok == TOK_UGE) {
4317 t = tok;
4318 next();
4319 expr_shift();
4320 gen_op(t);
4321 }
4322 }
4323
4324 static void expr_cmpeq(void)
4325 {
4326 int t;
4327
4328 expr_cmp();
4329 while (tok == TOK_EQ || tok == TOK_NE) {
4330 t = tok;
4331 next();
4332 expr_cmp();
4333 gen_op(t);
4334 }
4335 }
4336
4337 static void expr_and(void)
4338 {
4339 expr_cmpeq();
4340 while (tok == '&') {
4341 next();
4342 expr_cmpeq();
4343 gen_op('&');
4344 }
4345 }
4346
4347 static void expr_xor(void)
4348 {
4349 expr_and();
4350 while (tok == '^') {
4351 next();
4352 expr_and();
4353 gen_op('^');
4354 }
4355 }
4356
4357 static void expr_or(void)
4358 {
4359 expr_xor();
4360 while (tok == '|') {
4361 next();
4362 expr_xor();
4363 gen_op('|');
4364 }
4365 }
4366
4367 /* XXX: fix this mess */
4368 static void expr_land_const(void)
4369 {
4370 expr_or();
4371 while (tok == TOK_LAND) {
4372 next();
4373 expr_or();
4374 gen_op(TOK_LAND);
4375 }
4376 }
4377
4378 /* XXX: fix this mess */
4379 static void expr_lor_const(void)
4380 {
4381 expr_land_const();
4382 while (tok == TOK_LOR) {
4383 next();
4384 expr_land_const();
4385 gen_op(TOK_LOR);
4386 }
4387 }
4388
4389 /* only used if non constant */
4390 static void expr_land(void)
4391 {
4392 int t;
4393
4394 expr_or();
4395 if (tok == TOK_LAND) {
4396 t = 0;
4397 save_regs(1);
4398 for(;;) {
4399 t = gvtst(1, t);
4400 if (tok != TOK_LAND) {
4401 vseti(VT_JMPI, t);
4402 break;
4403 }
4404 next();
4405 expr_or();
4406 }
4407 }
4408 }
4409
4410 static void expr_lor(void)
4411 {
4412 int t;
4413
4414 expr_land();
4415 if (tok == TOK_LOR) {
4416 t = 0;
4417 save_regs(1);
4418 for(;;) {
4419 t = gvtst(0, t);
4420 if (tok != TOK_LOR) {
4421 vseti(VT_JMP, t);
4422 break;
4423 }
4424 next();
4425 expr_land();
4426 }
4427 }
4428 }
4429
4430 /* XXX: better constant handling */
4431 static void expr_cond(void)
4432 {
4433 int tt, u, r1, r2, rc, t1, t2, bt1, bt2;
4434 SValue sv;
4435 CType type, type1, type2;
4436
4437 if (const_wanted) {
4438 expr_lor_const();
4439 if (tok == '?') {
4440 CType boolean;
4441 int c;
4442 boolean.t = VT_BOOL;
4443 vdup();
4444 gen_cast(&boolean);
4445 c = vtop->c.i;
4446 vpop();
4447 next();
4448 if (tok != ':' || !gnu_ext) {
4449 vpop();
4450 gexpr();
4451 }
4452 if (!c)
4453 vpop();
4454 skip(':');
4455 expr_cond();
4456 if (c)
4457 vpop();
4458 }
4459 } else {
4460 expr_lor();
4461 if (tok == '?') {
4462 next();
4463 if (vtop != vstack) {
4464 /* needed to avoid having different registers saved in
4465 each branch */
4466 if (is_float(vtop->type.t)) {
4467 rc = RC_FLOAT;
4468 #ifdef TCC_TARGET_X86_64
4469 if ((vtop->type.t & VT_BTYPE) == VT_LDOUBLE) {
4470 rc = RC_ST0;
4471 }
4472 #endif
4473 }
4474 else
4475 rc = RC_INT;
4476 gv(rc);
4477 save_regs(1);
4478 }
4479 if (tok == ':' && gnu_ext) {
4480 gv_dup();
4481 tt = gvtst(1, 0);
4482 } else {
4483 tt = gvtst(1, 0);
4484 gexpr();
4485 }
4486 type1 = vtop->type;
4487 sv = *vtop; /* save value to handle it later */
4488 vtop--; /* no vpop so that FP stack is not flushed */
4489 skip(':');
4490 u = gjmp(0);
4491 gsym(tt);
4492 expr_cond();
4493 type2 = vtop->type;
4494
4495 t1 = type1.t;
4496 bt1 = t1 & VT_BTYPE;
4497 t2 = type2.t;
4498 bt2 = t2 & VT_BTYPE;
4499 /* cast operands to correct type according to ISOC rules */
4500 if (is_float(bt1) || is_float(bt2)) {
4501 if (bt1 == VT_LDOUBLE || bt2 == VT_LDOUBLE) {
4502 type.t = VT_LDOUBLE;
4503 } else if (bt1 == VT_DOUBLE || bt2 == VT_DOUBLE) {
4504 type.t = VT_DOUBLE;
4505 } else {
4506 type.t = VT_FLOAT;
4507 }
4508 } else if (bt1 == VT_LLONG || bt2 == VT_LLONG) {
4509 /* cast to biggest op */
4510 type.t = VT_LLONG;
4511 /* convert to unsigned if it does not fit in a long long */
4512 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED) ||
4513 (t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED))
4514 type.t |= VT_UNSIGNED;
4515 } else if (bt1 == VT_PTR || bt2 == VT_PTR) {
4516 /* If one is a null ptr constant the result type
4517 is the other. */
4518 if (is_null_pointer (vtop))
4519 type = type1;
4520 else if (is_null_pointer (&sv))
4521 type = type2;
4522 /* XXX: test pointer compatibility, C99 has more elaborate
4523 rules here. */
4524 else
4525 type = type1;
4526 } else if (bt1 == VT_FUNC || bt2 == VT_FUNC) {
4527 /* XXX: test function pointer compatibility */
4528 type = bt1 == VT_FUNC ? type1 : type2;
4529 } else if (bt1 == VT_STRUCT || bt2 == VT_STRUCT) {
4530 /* XXX: test structure compatibility */
4531 type = bt1 == VT_STRUCT ? type1 : type2;
4532 } else if (bt1 == VT_VOID || bt2 == VT_VOID) {
4533 /* NOTE: as an extension, we accept void on only one side */
4534 type.t = VT_VOID;
4535 } else {
4536 /* integer operations */
4537 type.t = VT_INT;
4538 /* convert to unsigned if it does not fit in an integer */
4539 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED) ||
4540 (t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED))
4541 type.t |= VT_UNSIGNED;
4542 }
4543
4544 /* now we convert second operand */
4545 gen_cast(&type);
4546 if (VT_STRUCT == (vtop->type.t & VT_BTYPE))
4547 gaddrof();
4548 rc = RC_INT;
4549 if (is_float(type.t)) {
4550 rc = RC_FLOAT;
4551 #ifdef TCC_TARGET_X86_64
4552 if ((type.t & VT_BTYPE) == VT_LDOUBLE) {
4553 rc = RC_ST0;
4554 }
4555 #endif
4556 } else if ((type.t & VT_BTYPE) == VT_LLONG) {
4557 /* for long longs, we use fixed registers to avoid having
4558 to handle a complicated move */
4559 rc = RC_IRET;
4560 }
4561
4562 r2 = gv(rc);
4563 /* this is horrible, but we must also convert first
4564 operand */
4565 tt = gjmp(0);
4566 gsym(u);
4567 /* put again first value and cast it */
4568 *vtop = sv;
4569 gen_cast(&type);
4570 if (VT_STRUCT == (vtop->type.t & VT_BTYPE))
4571 gaddrof();
4572 r1 = gv(rc);
4573 move_reg(r2, r1, type.t);
4574 vtop->r = r2;
4575 gsym(tt);
4576 }
4577 }
4578 }
4579
4580 static void expr_eq(void)
4581 {
4582 int t;
4583
4584 expr_cond();
4585 if (tok == '=' ||
4586 (tok >= TOK_A_MOD && tok <= TOK_A_DIV) ||
4587 tok == TOK_A_XOR || tok == TOK_A_OR ||
4588 tok == TOK_A_SHL || tok == TOK_A_SAR) {
4589 test_lvalue();
4590 t = tok;
4591 next();
4592 if (t == '=') {
4593 expr_eq();
4594 } else {
4595 vdup();
4596 expr_eq();
4597 gen_op(t & 0x7f);
4598 }
4599 vstore();
4600 }
4601 }
4602
4603 ST_FUNC void gexpr(void)
4604 {
4605 while (1) {
4606 expr_eq();
4607 if (tok != ',')
4608 break;
4609 vpop();
4610 next();
4611 }
4612 }
4613
4614 /* parse an expression and return its type without any side effect. */
4615 static void expr_type(CType *type)
4616 {
4617 int saved_nocode_wanted;
4618
4619 saved_nocode_wanted = nocode_wanted;
4620 nocode_wanted = 1;
4621 gexpr();
4622 *type = vtop->type;
4623 vpop();
4624 nocode_wanted = saved_nocode_wanted;
4625 }
4626
4627 /* parse a unary expression and return its type without any side
4628 effect. */
4629 static void unary_type(CType *type)
4630 {
4631 int a;
4632
4633 a = nocode_wanted;
4634 nocode_wanted = 1;
4635 unary();
4636 *type = vtop->type;
4637 vpop();
4638 nocode_wanted = a;
4639 }
4640
4641 /* parse a constant expression and return value in vtop. */
4642 static void expr_const1(void)
4643 {
4644 int a;
4645 a = const_wanted;
4646 const_wanted = 1;
4647 expr_cond();
4648 const_wanted = a;
4649 }
4650
4651 /* parse an integer constant and return its value. */
4652 ST_FUNC int expr_const(void)
4653 {
4654 int c;
4655 expr_const1();
4656 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) != VT_CONST)
4657 expect("constant expression");
4658 c = vtop->c.i;
4659 vpop();
4660 return c;
4661 }
4662
4663 /* return the label token if current token is a label, otherwise
4664 return zero */
4665 static int is_label(void)
4666 {
4667 int last_tok;
4668
4669 /* fast test first */
4670 if (tok < TOK_UIDENT)
4671 return 0;
4672 /* no need to save tokc because tok is an identifier */
4673 last_tok = tok;
4674 next();
4675 if (tok == ':') {
4676 next();
4677 return last_tok;
4678 } else {
4679 unget_tok(last_tok);
4680 return 0;
4681 }
4682 }
4683
4684 static void label_or_decl(int l)
4685 {
4686 int last_tok;
4687
4688 /* fast test first */
4689 if (tok >= TOK_UIDENT)
4690 {
4691 /* no need to save tokc because tok is an identifier */
4692 last_tok = tok;
4693 next();
4694 if (tok == ':') {
4695 unget_tok(last_tok);
4696 return;
4697 }
4698 unget_tok(last_tok);
4699 }
4700 decl(l);
4701 }
4702
4703 static void block(int *bsym, int *csym, int *case_sym, int *def_sym,
4704 int case_reg, int is_expr)
4705 {
4706 int a, b, c, d;
4707 Sym *s, *frame_bottom;
4708
4709 /* generate line number info */
4710 if (tcc_state->do_debug &&
4711 (last_line_num != file->line_num || last_ind != ind)) {
4712 put_stabn(N_SLINE, 0, file->line_num, ind - func_ind);
4713 last_ind = ind;
4714 last_line_num = file->line_num;
4715 }
4716
4717 if (is_expr) {
4718 /* default return value is (void) */
4719 vpushi(0);
4720 vtop->type.t = VT_VOID;
4721 }
4722
4723 if (tok == TOK_IF) {
4724 /* if test */
4725 next();
4726 skip('(');
4727 gexpr();
4728 skip(')');
4729 a = gvtst(1, 0);
4730 block(bsym, csym, case_sym, def_sym, case_reg, 0);
4731 c = tok;
4732 if (c == TOK_ELSE) {
4733 next();
4734 d = gjmp(0);
4735 gsym(a);
4736 block(bsym, csym, case_sym, def_sym, case_reg, 0);
4737 gsym(d); /* patch else jmp */
4738 } else
4739 gsym(a);
4740 } else if (tok == TOK_WHILE) {
4741 next();
4742 d = ind;
4743 skip('(');
4744 gexpr();
4745 skip(')');
4746 a = gvtst(1, 0);
4747 b = 0;
4748 block(&a, &b, case_sym, def_sym, case_reg, 0);
4749 gjmp_addr(d);
4750 gsym(a);
4751 gsym_addr(b, d);
4752 } else if (tok == '{') {
4753 Sym *llabel;
4754 int block_vla_sp_loc, *saved_vla_sp_loc, saved_vla_flags;
4755
4756 next();
4757 /* record local declaration stack position */
4758 s = local_stack;
4759 frame_bottom = sym_push2(&local_stack, SYM_FIELD, 0, 0);
4760 frame_bottom->next = scope_stack_bottom;
4761 scope_stack_bottom = frame_bottom;
4762 llabel = local_label_stack;
4763
4764 /* save VLA state */
4765 block_vla_sp_loc = *(saved_vla_sp_loc = vla_sp_loc);
4766 if (saved_vla_sp_loc != &vla_sp_root_loc)
4767 vla_sp_loc = &block_vla_sp_loc;
4768
4769 saved_vla_flags = vla_flags;
4770 vla_flags |= VLA_NEED_NEW_FRAME;
4771
4772 /* handle local labels declarations */
4773 if (tok == TOK_LABEL) {
4774 next();
4775 for(;;) {
4776 if (tok < TOK_UIDENT)
4777 expect("label identifier");
4778 label_push(&local_label_stack, tok, LABEL_DECLARED);
4779 next();
4780 if (tok == ',') {
4781 next();
4782 } else {
4783 skip(';');
4784 break;
4785 }
4786 }
4787 }
4788 while (tok != '}') {
4789 label_or_decl(VT_LOCAL);
4790 if (tok != '}') {
4791 if (is_expr)
4792 vpop();
4793 block(bsym, csym, case_sym, def_sym, case_reg, is_expr);
4794 }
4795 }
4796 /* pop locally defined labels */
4797 label_pop(&local_label_stack, llabel);
4798 if(is_expr) {
4799 /* XXX: this solution makes only valgrind happy...
4800 triggered by gcc.c-torture/execute/20000917-1.c */
4801 Sym *p;
4802 switch(vtop->type.t & VT_BTYPE) {
4803 /* case VT_PTR: */
4804 /* this breaks a compilation of the linux kernel v2.4.26 */
4805 /* pmd_t *new = ({ __asm__ __volatile__("ud2\n") ; ((pmd_t *)1); }); */
4806 /* Look a commit a80acab: Display error on statement expressions with complex return type */
4807 /* A pointer is not a complex return type */
4808 case VT_STRUCT:
4809 case VT_ENUM:
4810 case VT_FUNC:
4811 for(p=vtop->type.ref;p;p=p->prev)
4812 if(p->prev==s)
4813 tcc_error("unsupported expression type");
4814 }
4815 }
4816 /* pop locally defined symbols */
4817 scope_stack_bottom = scope_stack_bottom->next;
4818 sym_pop(&local_stack, s);
4819
4820 /* Pop VLA frames and restore stack pointer if required */
4821 if (saved_vla_sp_loc != &vla_sp_root_loc)
4822 *saved_vla_sp_loc = block_vla_sp_loc;
4823 if (vla_sp_loc != (saved_vla_sp_loc == &vla_sp_root_loc ? &vla_sp_root_loc : &block_vla_sp_loc)) {
4824 vla_sp_loc = saved_vla_sp_loc;
4825 gen_vla_sp_restore(*vla_sp_loc);
4826 }
4827 vla_flags = (vla_flags & ~VLA_SCOPE_FLAGS) | (saved_vla_flags & VLA_SCOPE_FLAGS);
4828
4829 next();
4830 } else if (tok == TOK_RETURN) {
4831 next();
4832 if (tok != ';') {
4833 gexpr();
4834 gen_assign_cast(&func_vt);
4835 #ifdef TCC_TARGET_ARM64
4836 // Perhaps it would be better to use this for all backends:
4837 greturn();
4838 #else
4839 if ((func_vt.t & VT_BTYPE) == VT_STRUCT) {
4840 CType type, ret_type;
4841 int ret_align, ret_nregs;
4842 ret_nregs = gfunc_sret(&func_vt, func_var, &ret_type,
4843 &ret_align);
4844 if (0 == ret_nregs) {
4845 /* if returning structure, must copy it to implicit
4846 first pointer arg location */
4847 type = func_vt;
4848 mk_pointer(&type);
4849 vset(&type, VT_LOCAL | VT_LVAL, func_vc);
4850 indir();
4851 vswap();
4852 /* copy structure value to pointer */
4853 vstore();
4854 } else {
4855 /* returning structure packed into registers */
4856 int r, size, addr, align;
4857 size = type_size(&func_vt,&align);
4858 if ((vtop->r != (VT_LOCAL | VT_LVAL) || (vtop->c.i & (ret_align-1)))
4859 && (align & (ret_align-1))) {
4860 loc = (loc - size) & -align;
4861 addr = loc;
4862 type = func_vt;
4863 vset(&type, VT_LOCAL | VT_LVAL, addr);
4864 vswap();
4865 vstore();
4866 vset(&ret_type, VT_LOCAL | VT_LVAL, addr);
4867 }
4868 vtop->type = ret_type;
4869 if (is_float(ret_type.t))
4870 r = rc_fret(ret_type.t);
4871 else
4872 r = RC_IRET;
4873
4874 for (;;) {
4875 gv(r);
4876 if (--ret_nregs == 0)
4877 break;
4878 /* We assume that when a structure is returned in multiple
4879 registers, their classes are consecutive values of the
4880 suite s(n) = 2^n */
4881 r <<= 1;
4882 /* XXX: compatible with arm only: ret_align == register_size */
4883 vtop->c.i += ret_align;
4884 vtop->r = VT_LOCAL | VT_LVAL;
4885 }
4886 }
4887 } else if (is_float(func_vt.t)) {
4888 gv(rc_fret(func_vt.t));
4889 } else {
4890 gv(RC_IRET);
4891 }
4892 #endif
4893 vtop--; /* NOT vpop() because on x86 it would flush the fp stack */
4894 }
4895 skip(';');
4896 rsym = gjmp(rsym); /* jmp */
4897 } else if (tok == TOK_BREAK) {
4898 /* compute jump */
4899 if (!bsym)
4900 tcc_error("cannot break");
4901 *bsym = gjmp(*bsym);
4902 next();
4903 skip(';');
4904 } else if (tok == TOK_CONTINUE) {
4905 /* compute jump */
4906 if (!csym)
4907 tcc_error("cannot continue");
4908 *csym = gjmp(*csym);
4909 next();
4910 skip(';');
4911 } else if (tok == TOK_FOR) {
4912 int e;
4913 next();
4914 skip('(');
4915 s = local_stack;
4916 frame_bottom = sym_push2(&local_stack, SYM_FIELD, 0, 0);
4917 frame_bottom->next = scope_stack_bottom;
4918 scope_stack_bottom = frame_bottom;
4919 if (tok != ';') {
4920 /* c99 for-loop init decl? */
4921 if (!decl0(VT_LOCAL, 1)) {
4922 /* no, regular for-loop init expr */
4923 gexpr();
4924 vpop();
4925 }
4926 }
4927 skip(';');
4928 d = ind;
4929 c = ind;
4930 a = 0;
4931 b = 0;
4932 if (tok != ';') {
4933 gexpr();
4934 a = gvtst(1, 0);
4935 }
4936 skip(';');
4937 if (tok != ')') {
4938 e = gjmp(0);
4939 c = ind;
4940 gexpr();
4941 vpop();
4942 gjmp_addr(d);
4943 gsym(e);
4944 }
4945 skip(')');
4946 block(&a, &b, case_sym, def_sym, case_reg, 0);
4947 gjmp_addr(c);
4948 gsym(a);
4949 gsym_addr(b, c);
4950 scope_stack_bottom = scope_stack_bottom->next;
4951 sym_pop(&local_stack, s);
4952 } else
4953 if (tok == TOK_DO) {
4954 next();
4955 a = 0;
4956 b = 0;
4957 d = ind;
4958 block(&a, &b, case_sym, def_sym, case_reg, 0);
4959 skip(TOK_WHILE);
4960 skip('(');
4961 gsym(b);
4962 gexpr();
4963 c = gvtst(0, 0);
4964 gsym_addr(c, d);
4965 skip(')');
4966 gsym(a);
4967 skip(';');
4968 } else
4969 if (tok == TOK_SWITCH) {
4970 next();
4971 skip('(');
4972 gexpr();
4973 /* XXX: other types than integer */
4974 case_reg = gv(RC_INT);
4975 vpop();
4976 skip(')');
4977 a = 0;
4978 b = gjmp(0); /* jump to first case */
4979 c = 0;
4980 block(&a, csym, &b, &c, case_reg, 0);
4981 /* if no default, jmp after switch */
4982 if (c == 0)
4983 c = ind;
4984 /* default label */
4985 gsym_addr(b, c);
4986 /* break label */
4987 gsym(a);
4988 } else
4989 if (tok == TOK_CASE) {
4990 int v1, v2;
4991 if (!case_sym)
4992 expect("switch");
4993 next();
4994 v1 = expr_const();
4995 v2 = v1;
4996 if (gnu_ext && tok == TOK_DOTS) {
4997 next();
4998 v2 = expr_const();
4999 if (v2 < v1)
5000 tcc_warning("empty case range");
5001 }
5002 /* since a case is like a label, we must skip it with a jmp */
5003 b = gjmp(0);
5004 gsym(*case_sym);
5005 vseti(case_reg, 0);
5006 vdup();
5007 vpushi(v1);
5008 if (v1 == v2) {
5009 gen_op(TOK_EQ);
5010 *case_sym = gtst(1, 0);
5011 } else {
5012 gen_op(TOK_GE);
5013 *case_sym = gtst(1, 0);
5014 vseti(case_reg, 0);
5015 vpushi(v2);
5016 gen_op(TOK_LE);
5017 *case_sym = gtst(1, *case_sym);
5018 }
5019 case_reg = gv(RC_INT);
5020 vpop();
5021 gsym(b);
5022 skip(':');
5023 is_expr = 0;
5024 goto block_after_label;
5025 } else
5026 if (tok == TOK_DEFAULT) {
5027 next();
5028 skip(':');
5029 if (!def_sym)
5030 expect("switch");
5031 if (*def_sym)
5032 tcc_error("too many 'default'");
5033 *def_sym = ind;
5034 is_expr = 0;
5035 goto block_after_label;
5036 } else
5037 if (tok == TOK_GOTO) {
5038 next();
5039 if (tok == '*' && gnu_ext) {
5040 /* computed goto */
5041 next();
5042 gexpr();
5043 if ((vtop->type.t & VT_BTYPE) != VT_PTR)
5044 expect("pointer");
5045 ggoto();
5046 } else if (tok >= TOK_UIDENT) {
5047 s = label_find(tok);
5048 /* put forward definition if needed */
5049 if (!s) {
5050 s = label_push(&global_label_stack, tok, LABEL_FORWARD);
5051 } else {
5052 if (s->r == LABEL_DECLARED)
5053 s->r = LABEL_FORWARD;
5054 }
5055 /* label already defined */
5056 if (vla_flags & VLA_IN_SCOPE) {
5057 /* If VLAs are in use, save the current stack pointer and
5058 reset the stack pointer to what it was at function entry
5059 (label will restore stack pointer in inner scopes) */
5060 vla_sp_save();
5061 gen_vla_sp_restore(vla_sp_root_loc);
5062 }
5063 if (s->r & LABEL_FORWARD)
5064 s->jnext = gjmp(s->jnext);
5065 else
5066 gjmp_addr(s->jnext);
5067 next();
5068 } else {
5069 expect("label identifier");
5070 }
5071 skip(';');
5072 } else if (tok == TOK_ASM1 || tok == TOK_ASM2 || tok == TOK_ASM3) {
5073 asm_instr();
5074 } else {
5075 b = is_label();
5076 if (b) {
5077 /* label case */
5078 if (vla_flags & VLA_IN_SCOPE) {
5079 /* save/restore stack pointer across label
5080 this is a no-op when combined with the load immediately
5081 after the label unless we arrive via goto */
5082 vla_sp_save();
5083 }
5084 s = label_find(b);
5085 if (s) {
5086 if (s->r == LABEL_DEFINED)
5087 tcc_error("duplicate label '%s'", get_tok_str(s->v, NULL));
5088 gsym(s->jnext);
5089 s->r = LABEL_DEFINED;
5090 } else {
5091 s = label_push(&global_label_stack, b, LABEL_DEFINED);
5092 }
5093 s->jnext = ind;
5094 if (vla_flags & VLA_IN_SCOPE) {
5095 gen_vla_sp_restore(*vla_sp_loc);
5096 vla_flags |= VLA_NEED_NEW_FRAME;
5097 }
5098 /* we accept this, but it is a mistake */
5099 block_after_label:
5100 if (tok == '}') {
5101 tcc_warning("deprecated use of label at end of compound statement");
5102 } else {
5103 if (is_expr)
5104 vpop();
5105 block(bsym, csym, case_sym, def_sym, case_reg, is_expr);
5106 }
5107 } else {
5108 /* expression case */
5109 if (tok != ';') {
5110 if (is_expr) {
5111 vpop();
5112 gexpr();
5113 } else {
5114 gexpr();
5115 vpop();
5116 }
5117 }
5118 skip(';');
5119 }
5120 }
5121 }
5122
5123 /* t is the array or struct type. c is the array or struct
5124 address. cur_index/cur_field is the pointer to the current
5125 value. 'size_only' is true if only size info is needed (only used
5126 in arrays) */
5127 static void decl_designator(CType *type, Section *sec, unsigned long c,
5128 int *cur_index, Sym **cur_field,
5129 int size_only, int *par_count_p)
5130 {
5131 Sym *s, *f;
5132 int notfirst, index, index_last, align, l, nb_elems, elem_size;
5133 CType type1;
5134
5135 notfirst = 0;
5136 elem_size = 0;
5137 nb_elems = 1;
5138 if (gnu_ext && (l = is_label()) != 0)
5139 goto struct_field;
5140 while (tok == '[' || tok == '.') {
5141 if (tok == '[') {
5142 if (!(type->t & VT_ARRAY))
5143 expect("array type");
5144 s = type->ref;
5145 next();
5146 index = expr_const();
5147 if (index < 0 || (s->c >= 0 && index >= s->c))
5148 expect("invalid index");
5149 if (tok == TOK_DOTS && gnu_ext) {
5150 next();
5151 index_last = expr_const();
5152 if (index_last < 0 ||
5153 (s->c >= 0 && index_last >= s->c) ||
5154 index_last < index)
5155 expect("invalid index");
5156 } else {
5157 index_last = index;
5158 }
5159 skip(']');
5160 if (!notfirst)
5161 *cur_index = index_last;
5162 type = pointed_type(type);
5163 elem_size = type_size(type, &align);
5164 c += index * elem_size;
5165 /* NOTE: we only support ranges for last designator */
5166 nb_elems = index_last - index + 1;
5167 if (nb_elems != 1) {
5168 notfirst = 1;
5169 break;
5170 }
5171 } else {
5172 next();
5173 l = tok;
5174 next();
5175 struct_field:
5176 if ((type->t & VT_BTYPE) != VT_STRUCT)
5177 expect("struct/union type");
5178 s = type->ref;
5179 l |= SYM_FIELD;
5180 f = s->next;
5181 while (f) {
5182 if (f->v == l)
5183 break;
5184 f = f->next;
5185 }
5186 if (!f)
5187 expect("field");
5188 if (!notfirst)
5189 *cur_field = f;
5190 /* XXX: fix this mess by using explicit storage field */
5191 type1 = f->type;
5192 type1.t |= (type->t & ~VT_TYPE);
5193 type = &type1;
5194 c += f->c;
5195 }
5196 notfirst = 1;
5197 }
5198 if (notfirst) {
5199 if (tok == '=') {
5200 next();
5201 } else {
5202 if (!gnu_ext)
5203 expect("=");
5204 }
5205 } else {
5206 if (type->t & VT_ARRAY) {
5207 index = *cur_index;
5208 type = pointed_type(type);
5209 c += index * type_size(type, &align);
5210 } else {
5211 f = *cur_field;
5212 if (!f)
5213 tcc_error("too many field init");
5214 /* XXX: fix this mess by using explicit storage field */
5215 type1 = f->type;
5216 type1.t |= (type->t & ~VT_TYPE);
5217 type = &type1;
5218 c += f->c;
5219 }
5220 }
5221 decl_initializer(type, sec, c, 0, size_only, par_count_p);
5222
5223 /* XXX: make it more general */
5224 if (!size_only && nb_elems > 1) {
5225 unsigned long c_end;
5226 uint8_t *src, *dst;
5227 int i;
5228
5229 if (!sec)
5230 tcc_error("range init not supported yet for dynamic storage");
5231 c_end = c + nb_elems * elem_size;
5232 if (c_end > sec->data_allocated)
5233 section_realloc(sec, c_end);
5234 src = sec->data + c;
5235 dst = src;
5236 for(i = 1; i < nb_elems; i++) {
5237 dst += elem_size;
5238 memcpy(dst, src, elem_size);
5239 }
5240 }
5241 }
5242
5243 #define EXPR_VAL 0
5244 #define EXPR_CONST 1
5245 #define EXPR_ANY 2
5246
5247 /* store a value or an expression directly in global data or in local array */
5248 static void init_putv(CType *type, Section *sec, unsigned long c,
5249 int v, int expr_type)
5250 {
5251 int saved_global_expr, bt, bit_pos, bit_size;
5252 void *ptr;
5253 unsigned long long bit_mask;
5254 CType dtype;
5255
5256 switch(expr_type) {
5257 case EXPR_VAL:
5258 vpushi(v);
5259 break;
5260 case EXPR_CONST:
5261 /* compound literals must be allocated globally in this case */
5262 saved_global_expr = global_expr;
5263 global_expr = 1;
5264 expr_const1();
5265 global_expr = saved_global_expr;
5266 /* NOTE: symbols are accepted */
5267 if ((vtop->r & (VT_VALMASK | VT_LVAL)) != VT_CONST)
5268 tcc_error("initializer element is not constant");
5269 break;
5270 case EXPR_ANY:
5271 expr_eq();
5272 break;
5273 }
5274
5275 dtype = *type;
5276 dtype.t &= ~VT_CONSTANT; /* need to do that to avoid false warning */
5277
5278 if (sec) {
5279 /* XXX: not portable */
5280 /* XXX: generate error if incorrect relocation */
5281 gen_assign_cast(&dtype);
5282 bt = type->t & VT_BTYPE;
5283 /* we'll write at most 16 bytes */
5284 if (c + 16 > sec->data_allocated) {
5285 section_realloc(sec, c + 16);
5286 }
5287 ptr = sec->data + c;
5288 /* XXX: make code faster ? */
5289 if (!(type->t & VT_BITFIELD)) {
5290 bit_pos = 0;
5291 bit_size = 32;
5292 bit_mask = -1LL;
5293 } else {
5294 bit_pos = (vtop->type.t >> VT_STRUCT_SHIFT) & 0x3f;
5295 bit_size = (vtop->type.t >> (VT_STRUCT_SHIFT + 6)) & 0x3f;
5296 bit_mask = (1LL << bit_size) - 1;
5297 }
5298 if ((vtop->r & VT_SYM) &&
5299 (bt == VT_BYTE ||
5300 bt == VT_SHORT ||
5301 bt == VT_DOUBLE ||
5302 bt == VT_LDOUBLE ||
5303 bt == VT_LLONG ||
5304 (bt == VT_INT && bit_size != 32)))
5305 tcc_error("initializer element is not computable at load time");
5306 switch(bt) {
5307 /* XXX: when cross-compiling we assume that each type has the
5308 same representation on host and target, which is likely to
5309 be wrong in the case of long double */
5310 case VT_BOOL:
5311 vtop->c.i = (vtop->c.i != 0);
5312 case VT_BYTE:
5313 *(char *)ptr |= (vtop->c.i & bit_mask) << bit_pos;
5314 break;
5315 case VT_SHORT:
5316 *(short *)ptr |= (vtop->c.i & bit_mask) << bit_pos;
5317 break;
5318 case VT_DOUBLE:
5319 *(double *)ptr = vtop->c.d;
5320 break;
5321 case VT_LDOUBLE:
5322 *(long double *)ptr = vtop->c.ld;
5323 break;
5324 case VT_LLONG:
5325 *(long long *)ptr |= (vtop->c.ll & bit_mask) << bit_pos;
5326 break;
5327 case VT_PTR: {
5328 addr_t val = (vtop->c.ptr_offset & bit_mask) << bit_pos;
5329 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
5330 if (vtop->r & VT_SYM)
5331 greloca(sec, vtop->sym, c, R_DATA_PTR, val);
5332 else
5333 *(addr_t *)ptr |= val;
5334 #else
5335 if (vtop->r & VT_SYM)
5336 greloc(sec, vtop->sym, c, R_DATA_PTR);
5337 *(addr_t *)ptr |= val;
5338 #endif
5339 break;
5340 }
5341 default: {
5342 int val = (vtop->c.i & bit_mask) << bit_pos;
5343 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
5344 if (vtop->r & VT_SYM)
5345 greloca(sec, vtop->sym, c, R_DATA_PTR, val);
5346 else
5347 *(int *)ptr |= val;
5348 #else
5349 if (vtop->r & VT_SYM)
5350 greloc(sec, vtop->sym, c, R_DATA_PTR);
5351 *(int *)ptr |= val;
5352 #endif
5353 break;
5354 }
5355 }
5356 vtop--;
5357 } else {
5358 vset(&dtype, VT_LOCAL|VT_LVAL, c);
5359 vswap();
5360 vstore();
5361 vpop();
5362 }
5363 }
5364
5365 /* put zeros for variable based init */
5366 static void init_putz(CType *t, Section *sec, unsigned long c, int size)
5367 {
5368 if (sec) {
5369 /* nothing to do because globals are already set to zero */
5370 } else {
5371 vpush_global_sym(&func_old_type, TOK_memset);
5372 vseti(VT_LOCAL, c);
5373 #ifdef TCC_TARGET_ARM
5374 vpushs(size);
5375 vpushi(0);
5376 #else
5377 vpushi(0);
5378 vpushs(size);
5379 #endif
5380 gfunc_call(3);
5381 }
5382 }
5383
5384 /* 't' contains the type and storage info. 'c' is the offset of the
5385 object in section 'sec'. If 'sec' is NULL, it means stack based
5386 allocation. 'first' is true if array '{' must be read (multi
5387 dimension implicit array init handling). 'size_only' is true if
5388 size only evaluation is wanted (only for arrays). */
5389 static void decl_initializer(CType *type, Section *sec, unsigned long c,
5390 int first, int size_only, int *par_count_p)
5391 {
5392 int index, array_length, n, no_oblock, nb, parlevel, parlevel1, i;
5393 int size1, align1, expr_type;
5394 Sym *s, *f;
5395 CType *t1;
5396
5397 if (type->t & VT_VLA) {
5398 int a;
5399
5400 /* save current stack pointer */
5401 if (vla_flags & VLA_NEED_NEW_FRAME) {
5402 vla_sp_save();
5403 vla_flags = VLA_IN_SCOPE;
5404 vla_sp_loc = &vla_sp_loc_tmp;
5405 }
5406
5407 vla_runtime_type_size(type, &a);
5408 gen_vla_alloc(type, a);
5409 vset(type, VT_LOCAL|VT_LVAL, c);
5410 vswap();
5411 vstore();
5412 vpop();
5413 } else if (type->t & VT_ARRAY) {
5414 s = type->ref;
5415 n = s->c;
5416 array_length = 0;
5417 t1 = pointed_type(type);
5418 size1 = type_size(t1, &align1);
5419
5420 no_oblock = 1;
5421 if ((first && tok != TOK_LSTR && tok != TOK_STR) ||
5422 tok == '{') {
5423 if (tok != '{')
5424 tcc_error("character array initializer must be a literal,"
5425 " optionally enclosed in braces");
5426 skip('{');
5427 no_oblock = 0;
5428 }
5429
5430 /* only parse strings here if correct type (otherwise: handle
5431 them as ((w)char *) expressions */
5432 if ((tok == TOK_LSTR &&
5433 #ifdef TCC_TARGET_PE
5434 (t1->t & VT_BTYPE) == VT_SHORT && (t1->t & VT_UNSIGNED)
5435 #else
5436 (t1->t & VT_BTYPE) == VT_INT
5437 #endif
5438 ) || (tok == TOK_STR && (t1->t & VT_BTYPE) == VT_BYTE)) {
5439 while (tok == TOK_STR || tok == TOK_LSTR) {
5440 int cstr_len, ch;
5441 CString *cstr;
5442
5443 cstr = tokc.cstr;
5444 /* compute maximum number of chars wanted */
5445 if (tok == TOK_STR)
5446 cstr_len = cstr->size;
5447 else
5448 cstr_len = cstr->size / sizeof(nwchar_t);
5449 cstr_len--;
5450 nb = cstr_len;
5451 if (n >= 0 && nb > (n - array_length))
5452 nb = n - array_length;
5453 if (!size_only) {
5454 if (cstr_len > nb)
5455 tcc_warning("initializer-string for array is too long");
5456 /* in order to go faster for common case (char
5457 string in global variable, we handle it
5458 specifically */
5459 if (sec && tok == TOK_STR && size1 == 1) {
5460 memcpy(sec->data + c + array_length, cstr->data, nb);
5461 } else {
5462 for(i=0;i<nb;i++) {
5463 if (tok == TOK_STR)
5464 ch = ((unsigned char *)cstr->data)[i];
5465 else
5466 ch = ((nwchar_t *)cstr->data)[i];
5467 init_putv(t1, sec, c + (array_length + i) * size1,
5468 ch, EXPR_VAL);
5469 }
5470 }
5471 }
5472 array_length += nb;
5473 next();
5474 }
5475 /* only add trailing zero if enough storage (no
5476 warning in this case since it is standard) */
5477 if (n < 0 || array_length < n) {
5478 if (!size_only) {
5479 init_putv(t1, sec, c + (array_length * size1), 0, EXPR_VAL);
5480 }
5481 array_length++;
5482 }
5483 } else {
5484 index = 0;
5485 while (tok != '}') {
5486 decl_designator(type, sec, c, &index, NULL, size_only, par_count_p);
5487 if (n >= 0 && index >= n)
5488 tcc_error("index too large");
5489 /* must put zero in holes (note that doing it that way
5490 ensures that it even works with designators) */
5491 if (!size_only && array_length < index) {
5492 init_putz(t1, sec, c + array_length * size1,
5493 (index - array_length) * size1);
5494 }
5495 index++;
5496 if (index > array_length)
5497 array_length = index;
5498 /* special test for multi dimensional arrays (may not
5499 be strictly correct if designators are used at the
5500 same time) */
5501 if (index >= n && no_oblock)
5502 break;
5503 if (*par_count_p != 0 && tok == ')') {
5504 skip(')');
5505 *par_count_p -= 1;
5506 }
5507 if (tok == '}')
5508 break;
5509 skip(',');
5510 }
5511 }
5512 if (!no_oblock)
5513 skip('}');
5514 /* put zeros at the end */
5515 if (!size_only && n >= 0 && array_length < n) {
5516 init_putz(t1, sec, c + array_length * size1,
5517 (n - array_length) * size1);
5518 }
5519 /* patch type size if needed */
5520 if (n < 0)
5521 s->c = array_length;
5522 } else if ((type->t & VT_BTYPE) == VT_STRUCT &&
5523 (sec || !first || tok == '{')) {
5524 int par_count;
5525
5526 /* NOTE: the previous test is a specific case for automatic
5527 struct/union init */
5528 /* XXX: union needs only one init */
5529
5530 /* XXX: this test is incorrect for local initializers
5531 beginning with ( without {. It would be much more difficult
5532 to do it correctly (ideally, the expression parser should
5533 be used in all cases) */
5534 par_count = 0;
5535 if (tok == '(') {
5536 AttributeDef ad1;
5537 CType type1;
5538 next();
5539 while (tok == '(') {
5540 par_count++;
5541 next();
5542 }
5543 if (!parse_btype(&type1, &ad1))
5544 expect("cast");
5545 type_decl(&type1, &ad1, &n, TYPE_ABSTRACT);
5546 #if 0
5547 if (!is_assignable_types(type, &type1))
5548 tcc_error("invalid type for cast");
5549 #endif
5550 skip(')');
5551 }
5552 no_oblock = 1;
5553 if (first || tok == '{') {
5554 skip('{');
5555 no_oblock = 0;
5556 }
5557 s = type->ref;
5558 f = s->next;
5559 array_length = 0;
5560 index = 0;
5561 n = s->c;
5562 while (tok != '}') {
5563 decl_designator(type, sec, c, NULL, &f, size_only, &par_count);
5564 index = f->c;
5565 if (!size_only && array_length < index) {
5566 init_putz(type, sec, c + array_length,
5567 index - array_length);
5568 }
5569 index = index + type_size(&f->type, &align1);
5570 if (index > array_length)
5571 array_length = index;
5572
5573 /* gr: skip fields from same union - ugly. */
5574 while (f->next) {
5575 int align = 0;
5576 int f_size = type_size(&f->type, &align);
5577 int f_type = (f->type.t & VT_BTYPE);
5578
5579 ///printf("index: %2d %08x -- %2d %08x\n", f->c, f->type.t, f->next->c, f->next->type.t);
5580 /* test for same offset */
5581 if (f->next->c != f->c)
5582 break;
5583 if ((f_type == VT_STRUCT) && (f_size == 0)) {
5584 /*
5585 Lets assume a structure of size 0 can't be a member of the union.
5586 This allow to compile the following code from a linux kernel v2.4.26
5587 typedef struct { } rwlock_t;
5588 struct fs_struct {
5589 int count;
5590 rwlock_t lock;
5591 int umask;
5592 };
5593 struct fs_struct init_fs = { { (1) }, (rwlock_t) {}, 0022, };
5594 tcc-0.9.23 can succesfully compile this version of the kernel.
5595 gcc don't have problems with this code too.
5596 */
5597 break;
5598 }
5599 /* if yes, test for bitfield shift */
5600 if ((f->type.t & VT_BITFIELD) && (f->next->type.t & VT_BITFIELD)) {
5601 int bit_pos_1 = (f->type.t >> VT_STRUCT_SHIFT) & 0x3f;
5602 int bit_pos_2 = (f->next->type.t >> VT_STRUCT_SHIFT) & 0x3f;
5603 //printf("bitfield %d %d\n", bit_pos_1, bit_pos_2);
5604 if (bit_pos_1 != bit_pos_2)
5605 break;
5606 }
5607 f = f->next;
5608 }
5609
5610 f = f->next;
5611 if (no_oblock && f == NULL)
5612 break;
5613 if (tok == '}')
5614 break;
5615 skip(',');
5616 }
5617 /* put zeros at the end */
5618 if (!size_only && array_length < n) {
5619 init_putz(type, sec, c + array_length,
5620 n - array_length);
5621 }
5622 if (!no_oblock)
5623 skip('}');
5624 while (par_count) {
5625 skip(')');
5626 par_count--;
5627 }
5628 } else if (tok == '{') {
5629 int par_count = 0;
5630 next();
5631 decl_initializer(type, sec, c, first, size_only, &par_count);
5632 skip('}');
5633 } else if (size_only) {
5634 /* just skip expression */
5635 parlevel = parlevel1 = 0;
5636 while ((parlevel > 0 || parlevel1 > 0 ||
5637 (tok != '}' && tok != ',')) && tok != -1) {
5638 if (tok == '(')
5639 parlevel++;
5640 else if (tok == ')') {
5641 if (parlevel == 0 && parlevel1 == 0)
5642 break;
5643 parlevel--;
5644 }
5645 else if (tok == '{')
5646 parlevel1++;
5647 else if (tok == '}') {
5648 if (parlevel == 0 && parlevel1 == 0)
5649 break;
5650 parlevel1--;
5651 }
5652 next();
5653 }
5654 } else {
5655 /* currently, we always use constant expression for globals
5656 (may change for scripting case) */
5657 expr_type = EXPR_CONST;
5658 if (!sec)
5659 expr_type = EXPR_ANY;
5660 init_putv(type, sec, c, 0, expr_type);
5661 }
5662 }
5663
5664 /* parse an initializer for type 't' if 'has_init' is non zero, and
5665 allocate space in local or global data space ('r' is either
5666 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
5667 variable 'v' with an associated name represented by 'asm_label' of
5668 scope 'scope' is declared before initializers are parsed. If 'v' is
5669 zero, then a reference to the new object is put in the value stack.
5670 If 'has_init' is 2, a special parsing is done to handle string
5671 constants. */
5672 static void decl_initializer_alloc(CType *type, AttributeDef *ad, int r,
5673 int has_init, int v, char *asm_label,
5674 int scope)
5675 {
5676 int size, align, addr, data_offset;
5677 int level;
5678 ParseState saved_parse_state = {0};
5679 TokenString init_str;
5680 Section *sec;
5681 Sym *flexible_array;
5682
5683 flexible_array = NULL;
5684 if ((type->t & VT_BTYPE) == VT_STRUCT) {
5685 Sym *field = type->ref->next;
5686 if (field) {
5687 while (field->next)
5688 field = field->next;
5689 if (field->type.t & VT_ARRAY && field->type.ref->c < 0)
5690 flexible_array = field;
5691 }
5692 }
5693
5694 size = type_size(type, &align);
5695 /* If unknown size, we must evaluate it before
5696 evaluating initializers because
5697 initializers can generate global data too
5698 (e.g. string pointers or ISOC99 compound
5699 literals). It also simplifies local
5700 initializers handling */
5701 tok_str_new(&init_str);
5702 if (size < 0 || (flexible_array && has_init)) {
5703 int par_count = 0;
5704 if (!has_init)
5705 tcc_error("unknown type size");
5706 /* get all init string */
5707 if (has_init == 2) {
5708 /* only get strings */
5709 while (tok == TOK_STR || tok == TOK_LSTR) {
5710 tok_str_add_tok(&init_str);
5711 next();
5712 }
5713 } else {
5714 level = 0;
5715 while (level > 0 || (tok != ',' && tok != ';')) {
5716 if (tok < 0)
5717 tcc_error("unexpected end of file in initializer");
5718 tok_str_add_tok(&init_str);
5719 if (tok == '{')
5720 level++;
5721 else if (tok == '}') {
5722 level--;
5723 if (level <= 0) {
5724 next();
5725 break;
5726 }
5727 }
5728 next();
5729 }
5730 }
5731 tok_str_add(&init_str, -1);
5732 tok_str_add(&init_str, 0);
5733
5734 /* compute size */
5735 save_parse_state(&saved_parse_state);
5736
5737 macro_ptr = init_str.str;
5738 next();
5739 decl_initializer(type, NULL, 0, 1, 1, &par_count);
5740 /* prepare second initializer parsing */
5741 macro_ptr = init_str.str;
5742 next();
5743
5744 /* if still unknown size, error */
5745 size = type_size(type, &align);
5746 if (size < 0)
5747 tcc_error("unknown type size");
5748 }
5749 if (flexible_array)
5750 size += flexible_array->type.ref->c * pointed_size(&flexible_array->type);
5751 /* take into account specified alignment if bigger */
5752 if (ad->a.aligned) {
5753 if (ad->a.aligned > align)
5754 align = ad->a.aligned;
5755 } else if (ad->a.packed) {
5756 align = 1;
5757 }
5758 if ((r & VT_VALMASK) == VT_LOCAL) {
5759 sec = NULL;
5760 #ifdef CONFIG_TCC_BCHECK
5761 if (tcc_state->do_bounds_check && (type->t & VT_ARRAY)) {
5762 loc--;
5763 }
5764 #endif
5765 loc = (loc - size) & -align;
5766 addr = loc;
5767 #ifdef CONFIG_TCC_BCHECK
5768 /* handles bounds */
5769 /* XXX: currently, since we do only one pass, we cannot track
5770 '&' operators, so we add only arrays */
5771 if (tcc_state->do_bounds_check && (type->t & VT_ARRAY)) {
5772 unsigned long *bounds_ptr;
5773 /* add padding between regions */
5774 loc--;
5775 /* then add local bound info */
5776 bounds_ptr = section_ptr_add(lbounds_section, 2 * sizeof(unsigned long));
5777 bounds_ptr[0] = addr;
5778 bounds_ptr[1] = size;
5779 }
5780 #endif
5781 if (v) {
5782 /* local variable */
5783 sym_push(v, type, r, addr);
5784 } else {
5785 /* push local reference */
5786 vset(type, r, addr);
5787 }
5788 } else {
5789 Sym *sym;
5790
5791 sym = NULL;
5792 if (v && scope == VT_CONST) {
5793 /* see if the symbol was already defined */
5794 sym = sym_find(v);
5795 if (sym) {
5796 if (!is_compatible_types(&sym->type, type))
5797 tcc_error("incompatible types for redefinition of '%s'",
5798 get_tok_str(v, NULL));
5799 if (sym->type.t & VT_EXTERN) {
5800 /* if the variable is extern, it was not allocated */
5801 sym->type.t &= ~VT_EXTERN;
5802 /* set array size if it was omitted in extern
5803 declaration */
5804 if ((sym->type.t & VT_ARRAY) &&
5805 sym->type.ref->c < 0 &&
5806 type->ref->c >= 0)
5807 sym->type.ref->c = type->ref->c;
5808 } else {
5809 /* we accept several definitions of the same
5810 global variable. this is tricky, because we
5811 must play with the SHN_COMMON type of the symbol */
5812 /* XXX: should check if the variable was already
5813 initialized. It is incorrect to initialized it
5814 twice */
5815 /* no init data, we won't add more to the symbol */
5816 if (!has_init)
5817 goto no_alloc;
5818 }
5819 }
5820 }
5821
5822 /* allocate symbol in corresponding section */
5823 sec = ad->section;
5824 if (!sec) {
5825 if (has_init)
5826 sec = data_section;
5827 else if (tcc_state->nocommon)
5828 sec = bss_section;
5829 }
5830 if (sec) {
5831 data_offset = sec->data_offset;
5832 data_offset = (data_offset + align - 1) & -align;
5833 addr = data_offset;
5834 /* very important to increment global pointer at this time
5835 because initializers themselves can create new initializers */
5836 data_offset += size;
5837 #ifdef CONFIG_TCC_BCHECK
5838 /* add padding if bound check */
5839 if (tcc_state->do_bounds_check)
5840 data_offset++;
5841 #endif
5842 sec->data_offset = data_offset;
5843 /* allocate section space to put the data */
5844 if (sec->sh_type != SHT_NOBITS &&
5845 data_offset > sec->data_allocated)
5846 section_realloc(sec, data_offset);
5847 /* align section if needed */
5848 if (align > sec->sh_addralign)
5849 sec->sh_addralign = align;
5850 } else {
5851 addr = 0; /* avoid warning */
5852 }
5853
5854 if (v) {
5855 if (scope != VT_CONST || !sym) {
5856 sym = sym_push(v, type, r | VT_SYM, 0);
5857 sym->asm_label = asm_label;
5858 }
5859 /* update symbol definition */
5860 if (sec) {
5861 put_extern_sym(sym, sec, addr, size);
5862 } else {
5863 ElfW(Sym) *esym;
5864 /* put a common area */
5865 put_extern_sym(sym, NULL, align, size);
5866 /* XXX: find a nicer way */
5867 esym = &((ElfW(Sym) *)symtab_section->data)[sym->c];
5868 esym->st_shndx = SHN_COMMON;
5869 }
5870 } else {
5871 /* push global reference */
5872 sym = get_sym_ref(type, sec, addr, size);
5873 vpushsym(type, sym);
5874 }
5875 /* patch symbol weakness */
5876 if (type->t & VT_WEAK)
5877 weaken_symbol(sym);
5878 apply_visibility(sym, type);
5879 #ifdef CONFIG_TCC_BCHECK
5880 /* handles bounds now because the symbol must be defined
5881 before for the relocation */
5882 if (tcc_state->do_bounds_check) {
5883 unsigned long *bounds_ptr;
5884
5885 greloc(bounds_section, sym, bounds_section->data_offset, R_DATA_PTR);
5886 /* then add global bound info */
5887 bounds_ptr = section_ptr_add(bounds_section, 2 * sizeof(long));
5888 bounds_ptr[0] = 0; /* relocated */
5889 bounds_ptr[1] = size;
5890 }
5891 #endif
5892 }
5893 if (has_init || (type->t & VT_VLA)) {
5894 int par_count = 0;
5895 decl_initializer(type, sec, addr, 1, 0, &par_count);
5896 /* restore parse state if needed */
5897 if (init_str.str) {
5898 tok_str_free(init_str.str);
5899 restore_parse_state(&saved_parse_state);
5900 }
5901 /* patch flexible array member size back to -1, */
5902 /* for possible subsequent similar declarations */
5903 if (flexible_array)
5904 flexible_array->type.ref->c = -1;
5905 }
5906 no_alloc: ;
5907 }
5908
5909 static void put_func_debug(Sym *sym)
5910 {
5911 char buf[512];
5912
5913 /* stabs info */
5914 /* XXX: we put here a dummy type */
5915 snprintf(buf, sizeof(buf), "%s:%c1",
5916 funcname, sym->type.t & VT_STATIC ? 'f' : 'F');
5917 put_stabs_r(buf, N_FUN, 0, file->line_num, 0,
5918 cur_text_section, sym->c);
5919 /* //gr gdb wants a line at the function */
5920 put_stabn(N_SLINE, 0, file->line_num, 0);
5921 last_ind = 0;
5922 last_line_num = 0;
5923 }
5924
5925 /* parse an old style function declaration list */
5926 /* XXX: check multiple parameter */
5927 static void func_decl_list(Sym *func_sym)
5928 {
5929 AttributeDef ad;
5930 int v;
5931 Sym *s;
5932 CType btype, type;
5933
5934 /* parse each declaration */
5935 while (tok != '{' && tok != ';' && tok != ',' && tok != TOK_EOF &&
5936 tok != TOK_ASM1 && tok != TOK_ASM2 && tok != TOK_ASM3) {
5937 if (!parse_btype(&btype, &ad))
5938 expect("declaration list");
5939 if (((btype.t & VT_BTYPE) == VT_ENUM ||
5940 (btype.t & VT_BTYPE) == VT_STRUCT) &&
5941 tok == ';') {
5942 /* we accept no variable after */
5943 } else {
5944 for(;;) {
5945 type = btype;
5946 type_decl(&type, &ad, &v, TYPE_DIRECT);
5947 /* find parameter in function parameter list */
5948 s = func_sym->next;
5949 while (s != NULL) {
5950 if ((s->v & ~SYM_FIELD) == v)
5951 goto found;
5952 s = s->next;
5953 }
5954 tcc_error("declaration for parameter '%s' but no such parameter",
5955 get_tok_str(v, NULL));
5956 found:
5957 /* check that no storage specifier except 'register' was given */
5958 if (type.t & VT_STORAGE)
5959 tcc_error("storage class specified for '%s'", get_tok_str(v, NULL));
5960 convert_parameter_type(&type);
5961 /* we can add the type (NOTE: it could be local to the function) */
5962 s->type = type;
5963 /* accept other parameters */
5964 if (tok == ',')
5965 next();
5966 else
5967 break;
5968 }
5969 }
5970 skip(';');
5971 }
5972 }
5973
5974 /* parse a function defined by symbol 'sym' and generate its code in
5975 'cur_text_section' */
5976 static void gen_function(Sym *sym)
5977 {
5978 int saved_nocode_wanted = nocode_wanted;
5979 nocode_wanted = 0;
5980 ind = cur_text_section->data_offset;
5981 /* NOTE: we patch the symbol size later */
5982 put_extern_sym(sym, cur_text_section, ind, 0);
5983 funcname = get_tok_str(sym->v, NULL);
5984 func_ind = ind;
5985 /* Initialize VLA state */
5986 vla_sp_loc = &vla_sp_root_loc;
5987 vla_flags = VLA_NEED_NEW_FRAME;
5988 /* put debug symbol */
5989 if (tcc_state->do_debug)
5990 put_func_debug(sym);
5991 /* push a dummy symbol to enable local sym storage */
5992 sym_push2(&local_stack, SYM_FIELD, 0, 0);
5993 gfunc_prolog(&sym->type);
5994 #ifdef CONFIG_TCC_BCHECK
5995 if (tcc_state->do_bounds_check
5996 && !strcmp(get_tok_str(sym->v, NULL), "main")) {
5997 int i;
5998
5999 sym = local_stack;
6000 for (i = 0, sym = local_stack; i < 2; i++, sym = sym->prev) {
6001 if (sym->v & SYM_FIELD || sym->prev->v & SYM_FIELD)
6002 break;
6003 vpush_global_sym(&func_old_type, TOK___bound_main_arg);
6004 vset(&sym->type, sym->r, sym->c);
6005 gfunc_call(1);
6006 }
6007 }
6008 #endif
6009 rsym = 0;
6010 block(NULL, NULL, NULL, NULL, 0, 0);
6011 gsym(rsym);
6012 gfunc_epilog();
6013 cur_text_section->data_offset = ind;
6014 label_pop(&global_label_stack, NULL);
6015 /* reset local stack */
6016 scope_stack_bottom = NULL;
6017 sym_pop(&local_stack, NULL);
6018 /* end of function */
6019 /* patch symbol size */
6020 ((ElfW(Sym) *)symtab_section->data)[sym->c].st_size =
6021 ind - func_ind;
6022 /* patch symbol weakness (this definition overrules any prototype) */
6023 if (sym->type.t & VT_WEAK)
6024 weaken_symbol(sym);
6025 apply_visibility(sym, &sym->type);
6026 if (tcc_state->do_debug) {
6027 put_stabn(N_FUN, 0, 0, ind - func_ind);
6028 }
6029 /* It's better to crash than to generate wrong code */
6030 cur_text_section = NULL;
6031 funcname = ""; /* for safety */
6032 func_vt.t = VT_VOID; /* for safety */
6033 func_var = 0; /* for safety */
6034 ind = 0; /* for safety */
6035 nocode_wanted = saved_nocode_wanted;
6036 }
6037
6038 ST_FUNC void gen_inline_functions(void)
6039 {
6040 Sym *sym;
6041 int *str, inline_generated, i;
6042 struct InlineFunc *fn;
6043
6044 /* iterate while inline function are referenced */
6045 for(;;) {
6046 inline_generated = 0;
6047 for (i = 0; i < tcc_state->nb_inline_fns; ++i) {
6048 fn = tcc_state->inline_fns[i];
6049 sym = fn->sym;
6050 if (sym && sym->c) {
6051 /* the function was used: generate its code and
6052 convert it to a normal function */
6053 str = fn->token_str;
6054 fn->sym = NULL;
6055 if (file)
6056 pstrcpy(file->filename, sizeof file->filename, fn->filename);
6057 sym->r = VT_SYM | VT_CONST;
6058 sym->type.t &= ~VT_INLINE;
6059
6060 macro_ptr = str;
6061 next();
6062 cur_text_section = text_section;
6063 gen_function(sym);
6064 macro_ptr = NULL; /* fail safe */
6065
6066 inline_generated = 1;
6067 }
6068 }
6069 if (!inline_generated)
6070 break;
6071 }
6072 for (i = 0; i < tcc_state->nb_inline_fns; ++i) {
6073 fn = tcc_state->inline_fns[i];
6074 str = fn->token_str;
6075 tok_str_free(str);
6076 }
6077 dynarray_reset(&tcc_state->inline_fns, &tcc_state->nb_inline_fns);
6078 }
6079
6080 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
6081 static int decl0(int l, int is_for_loop_init)
6082 {
6083 int v, has_init, r;
6084 CType type, btype;
6085 Sym *sym;
6086 AttributeDef ad;
6087
6088 while (1) {
6089 if (!parse_btype(&btype, &ad)) {
6090 if (is_for_loop_init)
6091 return 0;
6092 /* skip redundant ';' */
6093 /* XXX: find more elegant solution */
6094 if (tok == ';') {
6095 next();
6096 continue;
6097 }
6098 if (l == VT_CONST &&
6099 (tok == TOK_ASM1 || tok == TOK_ASM2 || tok == TOK_ASM3)) {
6100 /* global asm block */
6101 asm_global_instr();
6102 continue;
6103 }
6104 /* special test for old K&R protos without explicit int
6105 type. Only accepted when defining global data */
6106 if (l == VT_LOCAL || tok < TOK_DEFINE)
6107 break;
6108 btype.t = VT_INT;
6109 }
6110 if (((btype.t & VT_BTYPE) == VT_ENUM ||
6111 (btype.t & VT_BTYPE) == VT_STRUCT) &&
6112 tok == ';') {
6113 /* we accept no variable after */
6114 next();
6115 continue;
6116 }
6117 while (1) { /* iterate thru each declaration */
6118 char *asm_label; // associated asm label
6119 type = btype;
6120 type_decl(&type, &ad, &v, TYPE_DIRECT);
6121 #if 0
6122 {
6123 char buf[500];
6124 type_to_str(buf, sizeof(buf), t, get_tok_str(v, NULL));
6125 printf("type = '%s'\n", buf);
6126 }
6127 #endif
6128 if ((type.t & VT_BTYPE) == VT_FUNC) {
6129 if ((type.t & VT_STATIC) && (l == VT_LOCAL)) {
6130 tcc_error("function without file scope cannot be static");
6131 }
6132 /* if old style function prototype, we accept a
6133 declaration list */
6134 sym = type.ref;
6135 if (sym->c == FUNC_OLD)
6136 func_decl_list(sym);
6137 }
6138
6139 asm_label = NULL;
6140 if (gnu_ext && (tok == TOK_ASM1 || tok == TOK_ASM2 || tok == TOK_ASM3)) {
6141 CString astr;
6142
6143 asm_label_instr(&astr);
6144 asm_label = tcc_strdup(astr.data);
6145 cstr_free(&astr);
6146
6147 /* parse one last attribute list, after asm label */
6148 parse_attribute(&ad);
6149 }
6150
6151 if (ad.a.weak)
6152 type.t |= VT_WEAK;
6153 #ifdef TCC_TARGET_PE
6154 if (ad.a.func_import)
6155 type.t |= VT_IMPORT;
6156 if (ad.a.func_export)
6157 type.t |= VT_EXPORT;
6158 #endif
6159 type.t |= ad.a.visibility << VT_VIS_SHIFT;
6160
6161 if (tok == '{') {
6162 if (l == VT_LOCAL)
6163 tcc_error("cannot use local functions");
6164 if ((type.t & VT_BTYPE) != VT_FUNC)
6165 expect("function definition");
6166
6167 /* reject abstract declarators in function definition */
6168 sym = type.ref;
6169 while ((sym = sym->next) != NULL)
6170 if (!(sym->v & ~SYM_FIELD))
6171 expect("identifier");
6172
6173 /* XXX: cannot do better now: convert extern line to static inline */
6174 if ((type.t & (VT_EXTERN | VT_INLINE)) == (VT_EXTERN | VT_INLINE))
6175 type.t = (type.t & ~VT_EXTERN) | VT_STATIC;
6176
6177 sym = sym_find(v);
6178 if (sym) {
6179 Sym *ref;
6180 if ((sym->type.t & VT_BTYPE) != VT_FUNC)
6181 goto func_error1;
6182
6183 ref = sym->type.ref;
6184 if (0 == ref->a.func_proto)
6185 tcc_error("redefinition of '%s'", get_tok_str(v, NULL));
6186
6187 /* use func_call from prototype if not defined */
6188 if (ref->a.func_call != FUNC_CDECL
6189 && type.ref->a.func_call == FUNC_CDECL)
6190 type.ref->a.func_call = ref->a.func_call;
6191
6192 /* use export from prototype */
6193 if (ref->a.func_export)
6194 type.ref->a.func_export = 1;
6195
6196 /* use static from prototype */
6197 if (sym->type.t & VT_STATIC)
6198 type.t = (type.t & ~VT_EXTERN) | VT_STATIC;
6199
6200 /* If the definition has no visibility use the
6201 one from prototype. */
6202 if (! (type.t & VT_VIS_MASK))
6203 type.t |= sym->type.t & VT_VIS_MASK;
6204
6205 if (!is_compatible_types(&sym->type, &type)) {
6206 func_error1:
6207 tcc_error("incompatible types for redefinition of '%s'",
6208 get_tok_str(v, NULL));
6209 }
6210 type.ref->a.func_proto = 0;
6211 /* if symbol is already defined, then put complete type */
6212 sym->type = type;
6213 } else {
6214 /* put function symbol */
6215 sym = global_identifier_push(v, type.t, 0);
6216 sym->type.ref = type.ref;
6217 }
6218
6219 /* static inline functions are just recorded as a kind
6220 of macro. Their code will be emitted at the end of
6221 the compilation unit only if they are used */
6222 if ((type.t & (VT_INLINE | VT_STATIC)) ==
6223 (VT_INLINE | VT_STATIC)) {
6224 TokenString func_str;
6225 int block_level;
6226 struct InlineFunc *fn;
6227 const char *filename;
6228
6229 tok_str_new(&func_str);
6230
6231 block_level = 0;
6232 for(;;) {
6233 int t;
6234 if (tok == TOK_EOF)
6235 tcc_error("unexpected end of file");
6236 tok_str_add_tok(&func_str);
6237 t = tok;
6238 next();
6239 if (t == '{') {
6240 block_level++;
6241 } else if (t == '}') {
6242 block_level--;
6243 if (block_level == 0)
6244 break;
6245 }
6246 }
6247 tok_str_add(&func_str, -1);
6248 tok_str_add(&func_str, 0);
6249 filename = file ? file->filename : "";
6250 fn = tcc_malloc(sizeof *fn + strlen(filename));
6251 strcpy(fn->filename, filename);
6252 fn->sym = sym;
6253 fn->token_str = func_str.str;
6254 dynarray_add((void ***)&tcc_state->inline_fns, &tcc_state->nb_inline_fns, fn);
6255
6256 } else {
6257 /* compute text section */
6258 cur_text_section = ad.section;
6259 if (!cur_text_section)
6260 cur_text_section = text_section;
6261 sym->r = VT_SYM | VT_CONST;
6262 gen_function(sym);
6263 }
6264 break;
6265 } else {
6266 if (btype.t & VT_TYPEDEF) {
6267 /* save typedefed type */
6268 /* XXX: test storage specifiers ? */
6269 sym = sym_push(v, &type, 0, 0);
6270 sym->a = ad.a;
6271 sym->type.t |= VT_TYPEDEF;
6272 } else {
6273 r = 0;
6274 if ((type.t & VT_BTYPE) == VT_FUNC) {
6275 /* external function definition */
6276 /* specific case for func_call attribute */
6277 ad.a.func_proto = 1;
6278 type.ref->a = ad.a;
6279 } else if (!(type.t & VT_ARRAY)) {
6280 /* not lvalue if array */
6281 r |= lvalue_type(type.t);
6282 }
6283 has_init = (tok == '=');
6284 if (has_init && (type.t & VT_VLA))
6285 tcc_error("Variable length array cannot be initialized");
6286 if ((btype.t & VT_EXTERN) || ((type.t & VT_BTYPE) == VT_FUNC) ||
6287 ((type.t & VT_ARRAY) && (type.t & VT_STATIC) &&
6288 !has_init && l == VT_CONST && type.ref->c < 0)) {
6289 /* external variable or function */
6290 /* NOTE: as GCC, uninitialized global static
6291 arrays of null size are considered as
6292 extern */
6293 sym = external_sym(v, &type, r, asm_label);
6294
6295 if (ad.alias_target) {
6296 Section tsec;
6297 Elf32_Sym *esym;
6298 Sym *alias_target;
6299
6300 alias_target = sym_find(ad.alias_target);
6301 if (!alias_target || !alias_target->c)
6302 tcc_error("unsupported forward __alias__ attribute");
6303 esym = &((Elf32_Sym *)symtab_section->data)[alias_target->c];
6304 tsec.sh_num = esym->st_shndx;
6305 put_extern_sym2(sym, &tsec, esym->st_value, esym->st_size, 0);
6306 }
6307 } else {
6308 type.t |= (btype.t & VT_STATIC); /* Retain "static". */
6309 if (type.t & VT_STATIC)
6310 r |= VT_CONST;
6311 else
6312 r |= l;
6313 if (has_init)
6314 next();
6315 decl_initializer_alloc(&type, &ad, r, has_init, v, asm_label, l);
6316 }
6317 }
6318 if (tok != ',') {
6319 if (is_for_loop_init)
6320 return 1;
6321 skip(';');
6322 break;
6323 }
6324 next();
6325 }
6326 ad.a.aligned = 0;
6327 }
6328 }
6329 return 0;
6330 }
6331
6332 ST_FUNC void decl(int l)
6333 {
6334 decl0(l, 0);
6335 }
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