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lib/bcheck: Prevent __bound_local_new / __bound_local_delete from being miscompiled
[tinycc.git] / tccgen.c
blobf1839132c4e616c59894887daffee0a14f1353fc
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 SValue vstack[VSTACK_SIZE], *vtop;
59
60 ST_DATA int const_wanted; /* true if constant wanted */
61 ST_DATA int nocode_wanted; /* true if no code generation wanted for an expression */
62 ST_DATA int global_expr; /* true if compound literals must be allocated globally (used during initializers parsing */
63 ST_DATA CType func_vt; /* current function return type (used by return instruction) */
64 ST_DATA int func_vc;
65 ST_DATA int last_line_num, last_ind, func_ind; /* debug last line number and pc */
66 ST_DATA char *funcname;
67
68 ST_DATA CType char_pointer_type, func_old_type, int_type, size_type;
69
70 /* ------------------------------------------------------------------------- */
71 static void gen_cast(CType *type);
72 static inline CType *pointed_type(CType *type);
73 static int is_compatible_types(CType *type1, CType *type2);
74 static int parse_btype(CType *type, AttributeDef *ad);
75 static void type_decl(CType *type, AttributeDef *ad, int *v, int td);
76 static void parse_expr_type(CType *type);
77 static void decl_initializer(CType *type, Section *sec, unsigned long c, int first, int size_only);
78 static void block(int *bsym, int *csym, int *case_sym, int *def_sym, int case_reg, int is_expr);
79 static void decl_initializer_alloc(CType *type, AttributeDef *ad, int r, int has_init, int v, char *asm_label, int scope);
80 static int decl0(int l, int is_for_loop_init);
81 static void expr_eq(void);
82 static void unary_type(CType *type);
83 static void vla_runtime_type_size(CType *type, int *a);
84 static int is_compatible_parameter_types(CType *type1, CType *type2);
85 static void expr_type(CType *type);
86
87 ST_INLN int is_float(int t)
88 {
89 int bt;
90 bt = t & VT_BTYPE;
91 return bt == VT_LDOUBLE || bt == VT_DOUBLE || bt == VT_FLOAT;
92 }
93
94 /* we use our own 'finite' function to avoid potential problems with
95 non standard math libs */
96 /* XXX: endianness dependent */
97 ST_FUNC int ieee_finite(double d)
98 {
99 int *p = (int *)&d;
100 return ((unsigned)((p[1] | 0x800fffff) + 1)) >> 31;
101 }
102
103 ST_FUNC void test_lvalue(void)
104 {
105 if (!(vtop->r & VT_LVAL))
106 expect("lvalue");
107 }
108
109 /* ------------------------------------------------------------------------- */
110 /* symbol allocator */
111 static Sym *__sym_malloc(void)
112 {
113 Sym *sym_pool, *sym, *last_sym;
114 int i;
115
116 sym_pool = tcc_malloc(SYM_POOL_NB * sizeof(Sym));
117 dynarray_add(&sym_pools, &nb_sym_pools, sym_pool);
118
119 last_sym = sym_free_first;
120 sym = sym_pool;
121 for(i = 0; i < SYM_POOL_NB; i++) {
122 sym->next = last_sym;
123 last_sym = sym;
124 sym++;
125 }
126 sym_free_first = last_sym;
127 return last_sym;
128 }
129
130 static inline Sym *sym_malloc(void)
131 {
132 Sym *sym;
133 sym = sym_free_first;
134 if (!sym)
135 sym = __sym_malloc();
136 sym_free_first = sym->next;
137 return sym;
138 }
139
140 ST_INLN void sym_free(Sym *sym)
141 {
142 sym->next = sym_free_first;
143 tcc_free(sym->asm_label);
144 sym_free_first = sym;
145 }
146
147 /* push, without hashing */
148 ST_FUNC Sym *sym_push2(Sym **ps, int v, int t, long c)
149 {
150 Sym *s;
151 if (ps == &local_stack) {
152 for (s = *ps; s && s != scope_stack_bottom; s = s->prev)
153 if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM && s->v == v)
154 tcc_error("incompatible types for redefinition of '%s'",
155 get_tok_str(v, NULL));
156 }
157 s = *ps;
158 s = sym_malloc();
159 s->asm_label = NULL;
160 s->v = v;
161 s->type.t = t;
162 s->type.ref = NULL;
163 #ifdef _WIN64
164 s->d = NULL;
165 #endif
166 s->c = c;
167 s->next = NULL;
168 /* add in stack */
169 s->prev = *ps;
170 *ps = s;
171 return s;
172 }
173
174 /* find a symbol and return its associated structure. 's' is the top
175 of the symbol stack */
176 ST_FUNC Sym *sym_find2(Sym *s, int v)
177 {
178 while (s) {
179 if (s->v == v)
180 return s;
181 s = s->prev;
182 }
183 return NULL;
184 }
185
186 /* structure lookup */
187 ST_INLN Sym *struct_find(int v)
188 {
189 v -= TOK_IDENT;
190 if ((unsigned)v >= (unsigned)(tok_ident - TOK_IDENT))
191 return NULL;
192 return table_ident[v]->sym_struct;
193 }
194
195 /* find an identifier */
196 ST_INLN Sym *sym_find(int v)
197 {
198 v -= TOK_IDENT;
199 if ((unsigned)v >= (unsigned)(tok_ident - TOK_IDENT))
200 return NULL;
201 return table_ident[v]->sym_identifier;
202 }
203
204 /* push a given symbol on the symbol stack */
205 ST_FUNC Sym *sym_push(int v, CType *type, int r, int c)
206 {
207 Sym *s, **ps;
208 TokenSym *ts;
209
210 if (local_stack)
211 ps = &local_stack;
212 else
213 ps = &global_stack;
214 s = sym_push2(ps, v, type->t, c);
215 s->type.ref = type->ref;
216 s->r = r;
217 /* don't record fields or anonymous symbols */
218 /* XXX: simplify */
219 if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM) {
220 /* record symbol in token array */
221 ts = table_ident[(v & ~SYM_STRUCT) - TOK_IDENT];
222 if (v & SYM_STRUCT)
223 ps = &ts->sym_struct;
224 else
225 ps = &ts->sym_identifier;
226 s->prev_tok = *ps;
227 *ps = s;
228 }
229 return s;
230 }
231
232 /* push a global identifier */
233 ST_FUNC Sym *global_identifier_push(int v, int t, int c)
234 {
235 Sym *s, **ps;
236 s = sym_push2(&global_stack, v, t, c);
237 /* don't record anonymous symbol */
238 if (v < SYM_FIRST_ANOM) {
239 ps = &table_ident[v - TOK_IDENT]->sym_identifier;
240 /* modify the top most local identifier, so that
241 sym_identifier will point to 's' when popped */
242 while (*ps != NULL)
243 ps = &(*ps)->prev_tok;
244 s->prev_tok = NULL;
245 *ps = s;
246 }
247 return s;
248 }
249
250 /* pop symbols until top reaches 'b' */
251 ST_FUNC void sym_pop(Sym **ptop, Sym *b)
252 {
253 Sym *s, *ss, **ps;
254 TokenSym *ts;
255 int v;
256
257 s = *ptop;
258 while(s != b) {
259 ss = s->prev;
260 v = s->v;
261 /* remove symbol in token array */
262 /* XXX: simplify */
263 if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM) {
264 ts = table_ident[(v & ~SYM_STRUCT) - TOK_IDENT];
265 if (v & SYM_STRUCT)
266 ps = &ts->sym_struct;
267 else
268 ps = &ts->sym_identifier;
269 *ps = s->prev_tok;
270 }
271 sym_free(s);
272 s = ss;
273 }
274 *ptop = b;
275 }
276
277 static void weaken_symbol(Sym *sym)
278 {
279 sym->type.t |= VT_WEAK;
280 if (sym->c > 0) {
281 int esym_type;
282 ElfW(Sym) *esym;
283
284 esym = &((ElfW(Sym) *)symtab_section->data)[sym->c];
285 esym_type = ELFW(ST_TYPE)(esym->st_info);
286 esym->st_info = ELFW(ST_INFO)(STB_WEAK, esym_type);
287 }
288 }
289
290 /* ------------------------------------------------------------------------- */
291
292 ST_FUNC void swap(int *p, int *q)
293 {
294 int t;
295 t = *p;
296 *p = *q;
297 *q = t;
298 }
299
300 static void vsetc(CType *type, int r, CValue *vc)
301 {
302 int v;
303
304 if (vtop >= vstack + (VSTACK_SIZE - 1))
305 tcc_error("memory full");
306 /* cannot let cpu flags if other instruction are generated. Also
307 avoid leaving VT_JMP anywhere except on the top of the stack
308 because it would complicate the code generator. */
309 if (vtop >= vstack) {
310 v = vtop->r & VT_VALMASK;
311 if (v == VT_CMP || (v & ~1) == VT_JMP)
312 gv(RC_INT);
313 }
314 vtop++;
315 vtop->type = *type;
316 vtop->r = r;
317 vtop->r2 = VT_CONST;
318 vtop->c = *vc;
319 }
320
321 /* push constant of type "type" with useless value */
322 void vpush(CType *type)
323 {
324 CValue cval;
325 vsetc(type, VT_CONST, &cval);
326 }
327
328 /* push integer constant */
329 ST_FUNC void vpushi(int v)
330 {
331 CValue cval;
332 cval.i = v;
333 vsetc(&int_type, VT_CONST, &cval);
334 }
335
336 /* push a pointer sized constant */
337 static void vpushs(long long v)
338 {
339 CValue cval;
340 if (PTR_SIZE == 4)
341 cval.i = (int)v;
342 else
343 cval.ull = v;
344 vsetc(&size_type, VT_CONST, &cval);
345 }
346
347 /* push long long constant */
348 static void vpushll(long long v)
349 {
350 CValue cval;
351 CType ctype;
352 ctype.t = VT_LLONG;
353 ctype.ref = 0;
354 cval.ull = v;
355 vsetc(&ctype, VT_CONST, &cval);
356 }
357
358 /* push arbitrary 64bit constant */
359 void vpush64(int ty, unsigned long long v)
360 {
361 CValue cval;
362 CType ctype;
363 ctype.t = ty;
364 cval.ull = v;
365 vsetc(&ctype, VT_CONST, &cval);
366 }
367
368 /* Return a static symbol pointing to a section */
369 ST_FUNC Sym *get_sym_ref(CType *type, Section *sec, unsigned long offset, unsigned long size)
370 {
371 int v;
372 Sym *sym;
373
374 v = anon_sym++;
375 sym = global_identifier_push(v, type->t | VT_STATIC, 0);
376 sym->type.ref = type->ref;
377 sym->r = VT_CONST | VT_SYM;
378 put_extern_sym(sym, sec, offset, size);
379 return sym;
380 }
381
382 /* push a reference to a section offset by adding a dummy symbol */
383 static void vpush_ref(CType *type, Section *sec, unsigned long offset, unsigned long size)
384 {
385 CValue cval;
386
387 cval.ul = 0;
388 vsetc(type, VT_CONST | VT_SYM, &cval);
389 vtop->sym = get_sym_ref(type, sec, offset, size);
390 }
391
392 /* define a new external reference to a symbol 'v' of type 'u' */
393 ST_FUNC Sym *external_global_sym(int v, CType *type, int r)
394 {
395 Sym *s;
396
397 s = sym_find(v);
398 if (!s) {
399 /* push forward reference */
400 s = global_identifier_push(v, type->t | VT_EXTERN, 0);
401 s->type.ref = type->ref;
402 s->r = r | VT_CONST | VT_SYM;
403 }
404 return s;
405 }
406
407 /* define a new external reference to a symbol 'v' with alternate asm
408 name 'asm_label' of type 'u'. 'asm_label' is equal to NULL if there
409 is no alternate name (most cases) */
410 static Sym *external_sym(int v, CType *type, int r, char *asm_label)
411 {
412 Sym *s;
413
414 s = sym_find(v);
415 if (!s) {
416 /* push forward reference */
417 s = sym_push(v, type, r | VT_CONST | VT_SYM, 0);
418 s->asm_label = asm_label;
419 s->type.t |= VT_EXTERN;
420 } else if (s->type.ref == func_old_type.ref) {
421 s->type.ref = type->ref;
422 s->r = r | VT_CONST | VT_SYM;
423 s->type.t |= VT_EXTERN;
424 } else if (!is_compatible_types(&s->type, type)) {
425 tcc_error("incompatible types for redefinition of '%s'",
426 get_tok_str(v, NULL));
427 }
428 return s;
429 }
430
431 /* push a reference to global symbol v */
432 ST_FUNC void vpush_global_sym(CType *type, int v)
433 {
434 Sym *sym;
435 CValue cval;
436
437 sym = external_global_sym(v, type, 0);
438 cval.ul = 0;
439 vsetc(type, VT_CONST | VT_SYM, &cval);
440 vtop->sym = sym;
441 }
442
443 ST_FUNC void vset(CType *type, int r, int v)
444 {
445 CValue cval;
446
447 cval.i = v;
448 vsetc(type, r, &cval);
449 }
450
451 static void vseti(int r, int v)
452 {
453 CType type;
454 type.t = VT_INT;
455 type.ref = 0;
456 vset(&type, r, v);
457 }
458
459 ST_FUNC void vswap(void)
460 {
461 SValue tmp;
462
463 /* cannot let cpu flags if other instruction are generated. Also
464 avoid leaving VT_JMP anywhere except on the top of the stack
465 because it would complicate the code generator. */
466 if (vtop >= vstack) {
467 int v = vtop->r & VT_VALMASK;
468 if (v == VT_CMP || (v & ~1) == VT_JMP)
469 gv(RC_INT);
470 }
471 tmp = vtop[0];
472 vtop[0] = vtop[-1];
473 vtop[-1] = tmp;
474 }
475
476 ST_FUNC void vpushv(SValue *v)
477 {
478 if (vtop >= vstack + (VSTACK_SIZE - 1))
479 tcc_error("memory full");
480 vtop++;
481 *vtop = *v;
482 }
483
484 static void vdup(void)
485 {
486 vpushv(vtop);
487 }
488
489 /* save r to the memory stack, and mark it as being free */
490 ST_FUNC void save_reg(int r)
491 {
492 int l, saved, size, align;
493 SValue *p, sv;
494 CType *type;
495
496 /* modify all stack values */
497 saved = 0;
498 l = 0;
499 for(p=vstack;p<=vtop;p++) {
500 if ((p->r & VT_VALMASK) == r ||
501 ((p->type.t & VT_BTYPE) == VT_LLONG && (p->r2 & VT_VALMASK) == r)) {
502 /* must save value on stack if not already done */
503 if (!saved) {
504 /* NOTE: must reload 'r' because r might be equal to r2 */
505 r = p->r & VT_VALMASK;
506 /* store register in the stack */
507 type = &p->type;
508 if ((p->r & VT_LVAL) ||
509 (!is_float(type->t) && (type->t & VT_BTYPE) != VT_LLONG))
510 #ifdef TCC_TARGET_X86_64
511 type = &char_pointer_type;
512 #else
513 type = &int_type;
514 #endif
515 size = type_size(type, &align);
516 loc = (loc - size) & -align;
517 sv.type.t = type->t;
518 sv.r = VT_LOCAL | VT_LVAL;
519 sv.c.ul = loc;
520 store(r, &sv);
521 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
522 /* x86 specific: need to pop fp register ST0 if saved */
523 if (r == TREG_ST0) {
524 o(0xd8dd); /* fstp %st(0) */
525 }
526 #endif
527 #ifndef TCC_TARGET_X86_64
528 /* special long long case */
529 if ((type->t & VT_BTYPE) == VT_LLONG) {
530 sv.c.ul += 4;
531 store(p->r2, &sv);
532 }
533 #endif
534 l = loc;
535 saved = 1;
536 }
537 /* mark that stack entry as being saved on the stack */
538 if (p->r & VT_LVAL) {
539 /* also clear the bounded flag because the
540 relocation address of the function was stored in
541 p->c.ul */
542 p->r = (p->r & ~(VT_VALMASK | VT_BOUNDED)) | VT_LLOCAL;
543 } else {
544 p->r = lvalue_type(p->type.t) | VT_LOCAL;
545 }
546 p->r2 = VT_CONST;
547 p->c.ul = l;
548 }
549 }
550 }
551
552 #ifdef TCC_TARGET_ARM
553 /* find a register of class 'rc2' with at most one reference on stack.
554 * If none, call get_reg(rc) */
555 ST_FUNC int get_reg_ex(int rc, int rc2)
556 {
557 int r;
558 SValue *p;
559
560 for(r=0;r<NB_REGS;r++) {
561 if (reg_classes[r] & rc2) {
562 int n;
563 n=0;
564 for(p = vstack; p <= vtop; p++) {
565 if ((p->r & VT_VALMASK) == r ||
566 (p->r2 & VT_VALMASK) == r)
567 n++;
568 }
569 if (n <= 1)
570 return r;
571 }
572 }
573 return get_reg(rc);
574 }
575 #endif
576
577 /* find a free register of class 'rc'. If none, save one register */
578 ST_FUNC int get_reg(int rc)
579 {
580 int r;
581 SValue *p;
582
583 /* find a free register */
584 for(r=0;r<NB_REGS;r++) {
585 if (reg_classes[r] & rc) {
586 for(p=vstack;p<=vtop;p++) {
587 if ((p->r & VT_VALMASK) == r ||
588 (p->r2 & VT_VALMASK) == r)
589 goto notfound;
590 }
591 return r;
592 }
593 notfound: ;
594 }
595
596 /* no register left : free the first one on the stack (VERY
597 IMPORTANT to start from the bottom to ensure that we don't
598 spill registers used in gen_opi()) */
599 for(p=vstack;p<=vtop;p++) {
600 /* look at second register (if long long) */
601 r = p->r2 & VT_VALMASK;
602 if (r < VT_CONST && (reg_classes[r] & rc))
603 goto save_found;
604 r = p->r & VT_VALMASK;
605 if (r < VT_CONST && (reg_classes[r] & rc)) {
606 save_found:
607 save_reg(r);
608 return r;
609 }
610 }
611 /* Should never comes here */
612 return -1;
613 }
614
615 /* save registers up to (vtop - n) stack entry */
616 ST_FUNC void save_regs(int n)
617 {
618 int r;
619 SValue *p, *p1;
620 p1 = vtop - n;
621 for(p = vstack;p <= p1; p++) {
622 r = p->r & VT_VALMASK;
623 if (r < VT_CONST) {
624 save_reg(r);
625 }
626 }
627 }
628
629 /* move register 's' to 'r', and flush previous value of r to memory
630 if needed */
631 static void move_reg(int r, int s)
632 {
633 SValue sv;
634
635 if (r != s) {
636 save_reg(r);
637 sv.type.t = VT_INT;
638 sv.r = s;
639 sv.c.ul = 0;
640 load(r, &sv);
641 }
642 }
643
644 /* get address of vtop (vtop MUST BE an lvalue) */
645 static void gaddrof(void)
646 {
647 if (vtop->r & VT_REF)
648 gv(RC_INT);
649 vtop->r &= ~VT_LVAL;
650 /* tricky: if saved lvalue, then we can go back to lvalue */
651 if ((vtop->r & VT_VALMASK) == VT_LLOCAL)
652 vtop->r = (vtop->r & ~(VT_VALMASK | VT_LVAL_TYPE)) | VT_LOCAL | VT_LVAL;
653
654
655 }
656
657 #ifdef CONFIG_TCC_BCHECK
658 /* generate lvalue bound code */
659 static void gbound(void)
660 {
661 int lval_type;
662 CType type1;
663
664 vtop->r &= ~VT_MUSTBOUND;
665 /* if lvalue, then use checking code before dereferencing */
666 if (vtop->r & VT_LVAL) {
667 /* if not VT_BOUNDED value, then make one */
668 if (!(vtop->r & VT_BOUNDED)) {
669 lval_type = vtop->r & (VT_LVAL_TYPE | VT_LVAL);
670 /* must save type because we must set it to int to get pointer */
671 type1 = vtop->type;
672 vtop->type.t = VT_INT;
673 gaddrof();
674 vpushi(0);
675 gen_bounded_ptr_add();
676 vtop->r |= lval_type;
677 vtop->type = type1;
678 }
679 /* then check for dereferencing */
680 gen_bounded_ptr_deref();
681 }
682 }
683 #endif
684
685 /* store vtop a register belonging to class 'rc'. lvalues are
686 converted to values. Cannot be used if cannot be converted to
687 register value (such as structures). */
688 ST_FUNC int gv(int rc)
689 {
690 int r, bit_pos, bit_size, size, align, i;
691 #ifndef TCC_TARGET_X86_64
692 int rc2;
693 #endif
694
695 /* NOTE: get_reg can modify vstack[] */
696 if (vtop->type.t & VT_BITFIELD) {
697 CType type;
698 int bits = 32;
699 bit_pos = (vtop->type.t >> VT_STRUCT_SHIFT) & 0x3f;
700 bit_size = (vtop->type.t >> (VT_STRUCT_SHIFT + 6)) & 0x3f;
701 /* remove bit field info to avoid loops */
702 vtop->type.t &= ~(VT_BITFIELD | (-1 << VT_STRUCT_SHIFT));
703 /* cast to int to propagate signedness in following ops */
704 if ((vtop->type.t & VT_BTYPE) == VT_LLONG) {
705 type.t = VT_LLONG;
706 bits = 64;
707 } else
708 type.t = VT_INT;
709 if((vtop->type.t & VT_UNSIGNED) ||
710 (vtop->type.t & VT_BTYPE) == VT_BOOL)
711 type.t |= VT_UNSIGNED;
712 gen_cast(&type);
713 /* generate shifts */
714 vpushi(bits - (bit_pos + bit_size));
715 gen_op(TOK_SHL);
716 vpushi(bits - bit_size);
717 /* NOTE: transformed to SHR if unsigned */
718 gen_op(TOK_SAR);
719 r = gv(rc);
720 } else {
721 if (is_float(vtop->type.t) &&
722 (vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
723 Sym *sym;
724 int *ptr;
725 unsigned long offset;
726 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
727 CValue check;
728 #endif
729
730 /* XXX: unify with initializers handling ? */
731 /* CPUs usually cannot use float constants, so we store them
732 generically in data segment */
733 size = type_size(&vtop->type, &align);
734 offset = (data_section->data_offset + align - 1) & -align;
735 data_section->data_offset = offset;
736 /* XXX: not portable yet */
737 #if defined(__i386__) || defined(__x86_64__)
738 /* Zero pad x87 tenbyte long doubles */
739 if (size == LDOUBLE_SIZE) {
740 vtop->c.tab[2] &= 0xffff;
741 #if LDOUBLE_SIZE == 16
742 vtop->c.tab[3] = 0;
743 #endif
744 }
745 #endif
746 ptr = section_ptr_add(data_section, size);
747 size = size >> 2;
748 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
749 check.d = 1;
750 if(check.tab[0])
751 for(i=0;i<size;i++)
752 ptr[i] = vtop->c.tab[size-1-i];
753 else
754 #endif
755 for(i=0;i<size;i++)
756 ptr[i] = vtop->c.tab[i];
757 sym = get_sym_ref(&vtop->type, data_section, offset, size << 2);
758 vtop->r |= VT_LVAL | VT_SYM;
759 vtop->sym = sym;
760 vtop->c.ul = 0;
761 }
762 #ifdef CONFIG_TCC_BCHECK
763 if (vtop->r & VT_MUSTBOUND)
764 gbound();
765 #endif
766
767 r = vtop->r & VT_VALMASK;
768 #ifndef TCC_TARGET_X86_64
769 rc2 = RC_INT;
770 if (rc == RC_IRET)
771 rc2 = RC_LRET;
772 #endif
773 /* need to reload if:
774 - constant
775 - lvalue (need to dereference pointer)
776 - already a register, but not in the right class */
777 if (r >= VT_CONST
778 || (vtop->r & VT_LVAL)
779 || !(reg_classes[r] & rc)
780 #ifndef TCC_TARGET_X86_64
781 || ((vtop->type.t & VT_BTYPE) == VT_LLONG && !(reg_classes[vtop->r2] & rc2))
782 #endif
783 )
784 {
785 r = get_reg(rc);
786 #ifndef TCC_TARGET_X86_64
787 if ((vtop->type.t & VT_BTYPE) == VT_LLONG) {
788 int r2;
789 unsigned long long ll;
790 /* two register type load : expand to two words
791 temporarily */
792 if ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
793 /* load constant */
794 ll = vtop->c.ull;
795 vtop->c.ui = ll; /* first word */
796 load(r, vtop);
797 vtop->r = r; /* save register value */
798 vpushi(ll >> 32); /* second word */
799 } else if (r >= VT_CONST || /* XXX: test to VT_CONST incorrect ? */
800 (vtop->r & VT_LVAL)) {
801 /* We do not want to modifier the long long
802 pointer here, so the safest (and less
803 efficient) is to save all the other registers
804 in the stack. XXX: totally inefficient. */
805 save_regs(1);
806 /* load from memory */
807 load(r, vtop);
808 vdup();
809 vtop[-1].r = r; /* save register value */
810 /* increment pointer to get second word */
811 vtop->type.t = VT_INT;
812 gaddrof();
813 vpushi(4);
814 gen_op('+');
815 vtop->r |= VT_LVAL;
816 } else {
817 /* move registers */
818 load(r, vtop);
819 vdup();
820 vtop[-1].r = r; /* save register value */
821 vtop->r = vtop[-1].r2;
822 }
823 /* Allocate second register. Here we rely on the fact that
824 get_reg() tries first to free r2 of an SValue. */
825 r2 = get_reg(rc2);
826 load(r2, vtop);
827 vpop();
828 /* write second register */
829 vtop->r2 = r2;
830 } else
831 #endif
832 if ((vtop->r & VT_LVAL) && !is_float(vtop->type.t)) {
833 int t1, t;
834 /* lvalue of scalar type : need to use lvalue type
835 because of possible cast */
836 t = vtop->type.t;
837 t1 = t;
838 /* compute memory access type */
839 if (vtop->r & VT_LVAL_BYTE)
840 t = VT_BYTE;
841 else if (vtop->r & VT_LVAL_SHORT)
842 t = VT_SHORT;
843 if (vtop->r & VT_LVAL_UNSIGNED)
844 t |= VT_UNSIGNED;
845 vtop->type.t = t;
846 load(r, vtop);
847 /* restore wanted type */
848 vtop->type.t = t1;
849 } else {
850 /* one register type load */
851 load(r, vtop);
852 }
853 }
854 vtop->r = r;
855 #ifdef TCC_TARGET_C67
856 /* uses register pairs for doubles */
857 if ((vtop->type.t & VT_BTYPE) == VT_DOUBLE)
858 vtop->r2 = r+1;
859 #endif
860 }
861 return r;
862 }
863
864 /* generate vtop[-1] and vtop[0] in resp. classes rc1 and rc2 */
865 ST_FUNC void gv2(int rc1, int rc2)
866 {
867 int v;
868
869 /* generate more generic register first. But VT_JMP or VT_CMP
870 values must be generated first in all cases to avoid possible
871 reload errors */
872 v = vtop[0].r & VT_VALMASK;
873 if (v != VT_CMP && (v & ~1) != VT_JMP && rc1 <= rc2) {
874 vswap();
875 gv(rc1);
876 vswap();
877 gv(rc2);
878 /* test if reload is needed for first register */
879 if ((vtop[-1].r & VT_VALMASK) >= VT_CONST) {
880 vswap();
881 gv(rc1);
882 vswap();
883 }
884 } else {
885 gv(rc2);
886 vswap();
887 gv(rc1);
888 vswap();
889 /* test if reload is needed for first register */
890 if ((vtop[0].r & VT_VALMASK) >= VT_CONST) {
891 gv(rc2);
892 }
893 }
894 }
895
896 /* wrapper around RC_FRET to return a register by type */
897 static int rc_fret(int t)
898 {
899 #ifdef TCC_TARGET_X86_64
900 if (t == VT_LDOUBLE) {
901 return RC_ST0;
902 }
903 #endif
904 return RC_FRET;
905 }
906
907 /* wrapper around REG_FRET to return a register by type */
908 static int reg_fret(int t)
909 {
910 #ifdef TCC_TARGET_X86_64
911 if (t == VT_LDOUBLE) {
912 return TREG_ST0;
913 }
914 #endif
915 return REG_FRET;
916 }
917
918 /* expand long long on stack in two int registers */
919 static void lexpand(void)
920 {
921 int u;
922
923 u = vtop->type.t & VT_UNSIGNED;
924 gv(RC_INT);
925 vdup();
926 vtop[0].r = vtop[-1].r2;
927 vtop[0].r2 = VT_CONST;
928 vtop[-1].r2 = VT_CONST;
929 vtop[0].type.t = VT_INT | u;
930 vtop[-1].type.t = VT_INT | u;
931 }
932
933 #ifdef TCC_TARGET_ARM
934 /* expand long long on stack */
935 ST_FUNC void lexpand_nr(void)
936 {
937 int u,v;
938
939 u = vtop->type.t & VT_UNSIGNED;
940 vdup();
941 vtop->r2 = VT_CONST;
942 vtop->type.t = VT_INT | u;
943 v=vtop[-1].r & (VT_VALMASK | VT_LVAL);
944 if (v == VT_CONST) {
945 vtop[-1].c.ui = vtop->c.ull;
946 vtop->c.ui = vtop->c.ull >> 32;
947 vtop->r = VT_CONST;
948 } else if (v == (VT_LVAL|VT_CONST) || v == (VT_LVAL|VT_LOCAL)) {
949 vtop->c.ui += 4;
950 vtop->r = vtop[-1].r;
951 } else if (v > VT_CONST) {
952 vtop--;
953 lexpand();
954 } else
955 vtop->r = vtop[-1].r2;
956 vtop[-1].r2 = VT_CONST;
957 vtop[-1].type.t = VT_INT | u;
958 }
959 #endif
960
961 /* build a long long from two ints */
962 static void lbuild(int t)
963 {
964 gv2(RC_INT, RC_INT);
965 vtop[-1].r2 = vtop[0].r;
966 vtop[-1].type.t = t;
967 vpop();
968 }
969
970 /* rotate n first stack elements to the bottom
971 I1 ... In -> I2 ... In I1 [top is right]
972 */
973 ST_FUNC void vrotb(int n)
974 {
975 int i;
976 SValue tmp;
977
978 tmp = vtop[-n + 1];
979 for(i=-n+1;i!=0;i++)
980 vtop[i] = vtop[i+1];
981 vtop[0] = tmp;
982 }
983
984 /* rotate the n elements before entry e towards the top
985 I1 ... In ... -> In I1 ... I(n-1) ... [top is right]
986 */
987 ST_FUNC void vrote(SValue *e, int n)
988 {
989 int i;
990 SValue tmp;
991
992 tmp = *e;
993 for(i = 0;i < n - 1; i++)
994 e[-i] = e[-i - 1];
995 e[-n + 1] = tmp;
996 }
997
998 /* rotate n first stack elements to the top
999 I1 ... In -> In I1 ... I(n-1) [top is right]
1000 */
1001 ST_FUNC void vrott(int n)
1002 {
1003 vrote(vtop, n);
1004 }
1005
1006 /* pop stack value */
1007 ST_FUNC void vpop(void)
1008 {
1009 int v;
1010 v = vtop->r & VT_VALMASK;
1011 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
1012 /* for x86, we need to pop the FP stack */
1013 if (v == TREG_ST0 && !nocode_wanted) {
1014 o(0xd8dd); /* fstp %st(0) */
1015 } else
1016 #endif
1017 if (v == VT_JMP || v == VT_JMPI) {
1018 /* need to put correct jump if && or || without test */
1019 gsym(vtop->c.ul);
1020 }
1021 vtop--;
1022 }
1023
1024 /* convert stack entry to register and duplicate its value in another
1025 register */
1026 static void gv_dup(void)
1027 {
1028 int rc, t, r, r1;
1029 SValue sv;
1030
1031 t = vtop->type.t;
1032 if ((t & VT_BTYPE) == VT_LLONG) {
1033 lexpand();
1034 gv_dup();
1035 vswap();
1036 vrotb(3);
1037 gv_dup();
1038 vrotb(4);
1039 /* stack: H L L1 H1 */
1040 lbuild(t);
1041 vrotb(3);
1042 vrotb(3);
1043 vswap();
1044 lbuild(t);
1045 vswap();
1046 } else {
1047 /* duplicate value */
1048 rc = RC_INT;
1049 sv.type.t = VT_INT;
1050 if (is_float(t)) {
1051 rc = RC_FLOAT;
1052 #ifdef TCC_TARGET_X86_64
1053 if ((t & VT_BTYPE) == VT_LDOUBLE) {
1054 rc = RC_ST0;
1055 }
1056 #endif
1057 sv.type.t = t;
1058 }
1059 r = gv(rc);
1060 r1 = get_reg(rc);
1061 sv.r = r;
1062 sv.c.ul = 0;
1063 load(r1, &sv); /* move r to r1 */
1064 vdup();
1065 /* duplicates value */
1066 if (r != r1)
1067 vtop->r = r1;
1068 }
1069 }
1070
1071 #ifndef TCC_TARGET_X86_64
1072 /* generate CPU independent (unsigned) long long operations */
1073 static void gen_opl(int op)
1074 {
1075 int t, a, b, op1, c, i;
1076 int func;
1077 unsigned short reg_iret = REG_IRET;
1078 unsigned short reg_lret = REG_LRET;
1079 SValue tmp;
1080
1081 switch(op) {
1082 case '/':
1083 case TOK_PDIV:
1084 func = TOK___divdi3;
1085 goto gen_func;
1086 case TOK_UDIV:
1087 func = TOK___udivdi3;
1088 goto gen_func;
1089 case '%':
1090 func = TOK___moddi3;
1091 goto gen_mod_func;
1092 case TOK_UMOD:
1093 func = TOK___umoddi3;
1094 gen_mod_func:
1095 #ifdef TCC_ARM_EABI
1096 reg_iret = TREG_R2;
1097 reg_lret = TREG_R3;
1098 #endif
1099 gen_func:
1100 /* call generic long long function */
1101 vpush_global_sym(&func_old_type, func);
1102 vrott(3);
1103 gfunc_call(2);
1104 vpushi(0);
1105 vtop->r = reg_iret;
1106 vtop->r2 = reg_lret;
1107 break;
1108 case '^':
1109 case '&':
1110 case '|':
1111 case '*':
1112 case '+':
1113 case '-':
1114 t = vtop->type.t;
1115 vswap();
1116 lexpand();
1117 vrotb(3);
1118 lexpand();
1119 /* stack: L1 H1 L2 H2 */
1120 tmp = vtop[0];
1121 vtop[0] = vtop[-3];
1122 vtop[-3] = tmp;
1123 tmp = vtop[-2];
1124 vtop[-2] = vtop[-3];
1125 vtop[-3] = tmp;
1126 vswap();
1127 /* stack: H1 H2 L1 L2 */
1128 if (op == '*') {
1129 vpushv(vtop - 1);
1130 vpushv(vtop - 1);
1131 gen_op(TOK_UMULL);
1132 lexpand();
1133 /* stack: H1 H2 L1 L2 ML MH */
1134 for(i=0;i<4;i++)
1135 vrotb(6);
1136 /* stack: ML MH H1 H2 L1 L2 */
1137 tmp = vtop[0];
1138 vtop[0] = vtop[-2];
1139 vtop[-2] = tmp;
1140 /* stack: ML MH H1 L2 H2 L1 */
1141 gen_op('*');
1142 vrotb(3);
1143 vrotb(3);
1144 gen_op('*');
1145 /* stack: ML MH M1 M2 */
1146 gen_op('+');
1147 gen_op('+');
1148 } else if (op == '+' || op == '-') {
1149 /* XXX: add non carry method too (for MIPS or alpha) */
1150 if (op == '+')
1151 op1 = TOK_ADDC1;
1152 else
1153 op1 = TOK_SUBC1;
1154 gen_op(op1);
1155 /* stack: H1 H2 (L1 op L2) */
1156 vrotb(3);
1157 vrotb(3);
1158 gen_op(op1 + 1); /* TOK_xxxC2 */
1159 } else {
1160 gen_op(op);
1161 /* stack: H1 H2 (L1 op L2) */
1162 vrotb(3);
1163 vrotb(3);
1164 /* stack: (L1 op L2) H1 H2 */
1165 gen_op(op);
1166 /* stack: (L1 op L2) (H1 op H2) */
1167 }
1168 /* stack: L H */
1169 lbuild(t);
1170 break;
1171 case TOK_SAR:
1172 case TOK_SHR:
1173 case TOK_SHL:
1174 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
1175 t = vtop[-1].type.t;
1176 vswap();
1177 lexpand();
1178 vrotb(3);
1179 /* stack: L H shift */
1180 c = (int)vtop->c.i;
1181 /* constant: simpler */
1182 /* NOTE: all comments are for SHL. the other cases are
1183 done by swaping words */
1184 vpop();
1185 if (op != TOK_SHL)
1186 vswap();
1187 if (c >= 32) {
1188 /* stack: L H */
1189 vpop();
1190 if (c > 32) {
1191 vpushi(c - 32);
1192 gen_op(op);
1193 }
1194 if (op != TOK_SAR) {
1195 vpushi(0);
1196 } else {
1197 gv_dup();
1198 vpushi(31);
1199 gen_op(TOK_SAR);
1200 }
1201 vswap();
1202 } else {
1203 vswap();
1204 gv_dup();
1205 /* stack: H L L */
1206 vpushi(c);
1207 gen_op(op);
1208 vswap();
1209 vpushi(32 - c);
1210 if (op == TOK_SHL)
1211 gen_op(TOK_SHR);
1212 else
1213 gen_op(TOK_SHL);
1214 vrotb(3);
1215 /* stack: L L H */
1216 vpushi(c);
1217 if (op == TOK_SHL)
1218 gen_op(TOK_SHL);
1219 else
1220 gen_op(TOK_SHR);
1221 gen_op('|');
1222 }
1223 if (op != TOK_SHL)
1224 vswap();
1225 lbuild(t);
1226 } else {
1227 /* XXX: should provide a faster fallback on x86 ? */
1228 switch(op) {
1229 case TOK_SAR:
1230 func = TOK___ashrdi3;
1231 goto gen_func;
1232 case TOK_SHR:
1233 func = TOK___lshrdi3;
1234 goto gen_func;
1235 case TOK_SHL:
1236 func = TOK___ashldi3;
1237 goto gen_func;
1238 }
1239 }
1240 break;
1241 default:
1242 /* compare operations */
1243 t = vtop->type.t;
1244 vswap();
1245 lexpand();
1246 vrotb(3);
1247 lexpand();
1248 /* stack: L1 H1 L2 H2 */
1249 tmp = vtop[-1];
1250 vtop[-1] = vtop[-2];
1251 vtop[-2] = tmp;
1252 /* stack: L1 L2 H1 H2 */
1253 /* compare high */
1254 op1 = op;
1255 /* when values are equal, we need to compare low words. since
1256 the jump is inverted, we invert the test too. */
1257 if (op1 == TOK_LT)
1258 op1 = TOK_LE;
1259 else if (op1 == TOK_GT)
1260 op1 = TOK_GE;
1261 else if (op1 == TOK_ULT)
1262 op1 = TOK_ULE;
1263 else if (op1 == TOK_UGT)
1264 op1 = TOK_UGE;
1265 a = 0;
1266 b = 0;
1267 gen_op(op1);
1268 if (op1 != TOK_NE) {
1269 a = gtst(1, 0);
1270 }
1271 if (op != TOK_EQ) {
1272 /* generate non equal test */
1273 /* XXX: NOT PORTABLE yet */
1274 if (a == 0) {
1275 b = gtst(0, 0);
1276 } else {
1277 #if defined(TCC_TARGET_I386)
1278 b = psym(0x850f, 0);
1279 #elif defined(TCC_TARGET_ARM)
1280 b = ind;
1281 o(0x1A000000 | encbranch(ind, 0, 1));
1282 #elif defined(TCC_TARGET_C67)
1283 tcc_error("not implemented");
1284 #else
1285 #error not supported
1286 #endif
1287 }
1288 }
1289 /* compare low. Always unsigned */
1290 op1 = op;
1291 if (op1 == TOK_LT)
1292 op1 = TOK_ULT;
1293 else if (op1 == TOK_LE)
1294 op1 = TOK_ULE;
1295 else if (op1 == TOK_GT)
1296 op1 = TOK_UGT;
1297 else if (op1 == TOK_GE)
1298 op1 = TOK_UGE;
1299 gen_op(op1);
1300 a = gtst(1, a);
1301 gsym(b);
1302 vseti(VT_JMPI, a);
1303 break;
1304 }
1305 }
1306 #endif
1307
1308 /* handle integer constant optimizations and various machine
1309 independent opt */
1310 static void gen_opic(int op)
1311 {
1312 int c1, c2, t1, t2, n;
1313 SValue *v1, *v2;
1314 long long l1, l2;
1315 typedef unsigned long long U;
1316
1317 v1 = vtop - 1;
1318 v2 = vtop;
1319 t1 = v1->type.t & VT_BTYPE;
1320 t2 = v2->type.t & VT_BTYPE;
1321
1322 if (t1 == VT_LLONG)
1323 l1 = v1->c.ll;
1324 else if (v1->type.t & VT_UNSIGNED)
1325 l1 = v1->c.ui;
1326 else
1327 l1 = v1->c.i;
1328
1329 if (t2 == VT_LLONG)
1330 l2 = v2->c.ll;
1331 else if (v2->type.t & VT_UNSIGNED)
1332 l2 = v2->c.ui;
1333 else
1334 l2 = v2->c.i;
1335
1336 /* currently, we cannot do computations with forward symbols */
1337 c1 = (v1->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1338 c2 = (v2->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1339 if (c1 && c2) {
1340 switch(op) {
1341 case '+': l1 += l2; break;
1342 case '-': l1 -= l2; break;
1343 case '&': l1 &= l2; break;
1344 case '^': l1 ^= l2; break;
1345 case '|': l1 |= l2; break;
1346 case '*': l1 *= l2; break;
1347
1348 case TOK_PDIV:
1349 case '/':
1350 case '%':
1351 case TOK_UDIV:
1352 case TOK_UMOD:
1353 /* if division by zero, generate explicit division */
1354 if (l2 == 0) {
1355 if (const_wanted)
1356 tcc_error("division by zero in constant");
1357 goto general_case;
1358 }
1359 switch(op) {
1360 default: l1 /= l2; break;
1361 case '%': l1 %= l2; break;
1362 case TOK_UDIV: l1 = (U)l1 / l2; break;
1363 case TOK_UMOD: l1 = (U)l1 % l2; break;
1364 }
1365 break;
1366 case TOK_SHL: l1 <<= l2; break;
1367 case TOK_SHR: l1 = (U)l1 >> l2; break;
1368 case TOK_SAR: l1 >>= l2; break;
1369 /* tests */
1370 case TOK_ULT: l1 = (U)l1 < (U)l2; break;
1371 case TOK_UGE: l1 = (U)l1 >= (U)l2; break;
1372 case TOK_EQ: l1 = l1 == l2; break;
1373 case TOK_NE: l1 = l1 != l2; break;
1374 case TOK_ULE: l1 = (U)l1 <= (U)l2; break;
1375 case TOK_UGT: l1 = (U)l1 > (U)l2; break;
1376 case TOK_LT: l1 = l1 < l2; break;
1377 case TOK_GE: l1 = l1 >= l2; break;
1378 case TOK_LE: l1 = l1 <= l2; break;
1379 case TOK_GT: l1 = l1 > l2; break;
1380 /* logical */
1381 case TOK_LAND: l1 = l1 && l2; break;
1382 case TOK_LOR: l1 = l1 || l2; break;
1383 default:
1384 goto general_case;
1385 }
1386 v1->c.ll = l1;
1387 vtop--;
1388 } else {
1389 /* if commutative ops, put c2 as constant */
1390 if (c1 && (op == '+' || op == '&' || op == '^' ||
1391 op == '|' || op == '*')) {
1392 vswap();
1393 c2 = c1; //c = c1, c1 = c2, c2 = c;
1394 l2 = l1; //l = l1, l1 = l2, l2 = l;
1395 }
1396 /* Filter out NOP operations like x*1, x-0, x&-1... */
1397 if (c2 && (((op == '*' || op == '/' || op == TOK_UDIV ||
1398 op == TOK_PDIV) &&
1399 l2 == 1) ||
1400 ((op == '+' || op == '-' || op == '|' || op == '^' ||
1401 op == TOK_SHL || op == TOK_SHR || op == TOK_SAR) &&
1402 l2 == 0) ||
1403 (op == '&' &&
1404 l2 == -1))) {
1405 /* nothing to do */
1406 vtop--;
1407 } else if (c2 && (op == '*' || op == TOK_PDIV || op == TOK_UDIV)) {
1408 /* try to use shifts instead of muls or divs */
1409 if (l2 > 0 && (l2 & (l2 - 1)) == 0) {
1410 n = -1;
1411 while (l2) {
1412 l2 >>= 1;
1413 n++;
1414 }
1415 vtop->c.ll = n;
1416 if (op == '*')
1417 op = TOK_SHL;
1418 else if (op == TOK_PDIV)
1419 op = TOK_SAR;
1420 else
1421 op = TOK_SHR;
1422 }
1423 goto general_case;
1424 } else if (c2 && (op == '+' || op == '-') &&
1425 (((vtop[-1].r & (VT_VALMASK | VT_LVAL | VT_SYM)) == (VT_CONST | VT_SYM))
1426 || (vtop[-1].r & (VT_VALMASK | VT_LVAL)) == VT_LOCAL)) {
1427 /* symbol + constant case */
1428 if (op == '-')
1429 l2 = -l2;
1430 vtop--;
1431 vtop->c.ll += l2;
1432 } else {
1433 general_case:
1434 if (!nocode_wanted) {
1435 /* call low level op generator */
1436 if (t1 == VT_LLONG || t2 == VT_LLONG)
1437 gen_opl(op);
1438 else
1439 gen_opi(op);
1440 } else {
1441 vtop--;
1442 }
1443 }
1444 }
1445 }
1446
1447 /* generate a floating point operation with constant propagation */
1448 static void gen_opif(int op)
1449 {
1450 int c1, c2;
1451 SValue *v1, *v2;
1452 long double f1, f2;
1453
1454 v1 = vtop - 1;
1455 v2 = vtop;
1456 /* currently, we cannot do computations with forward symbols */
1457 c1 = (v1->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1458 c2 = (v2->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1459 if (c1 && c2) {
1460 if (v1->type.t == VT_FLOAT) {
1461 f1 = v1->c.f;
1462 f2 = v2->c.f;
1463 } else if (v1->type.t == VT_DOUBLE) {
1464 f1 = v1->c.d;
1465 f2 = v2->c.d;
1466 } else {
1467 f1 = v1->c.ld;
1468 f2 = v2->c.ld;
1469 }
1470
1471 /* NOTE: we only do constant propagation if finite number (not
1472 NaN or infinity) (ANSI spec) */
1473 if (!ieee_finite(f1) || !ieee_finite(f2))
1474 goto general_case;
1475
1476 switch(op) {
1477 case '+': f1 += f2; break;
1478 case '-': f1 -= f2; break;
1479 case '*': f1 *= f2; break;
1480 case '/':
1481 if (f2 == 0.0) {
1482 if (const_wanted)
1483 tcc_error("division by zero in constant");
1484 goto general_case;
1485 }
1486 f1 /= f2;
1487 break;
1488 /* XXX: also handles tests ? */
1489 default:
1490 goto general_case;
1491 }
1492 /* XXX: overflow test ? */
1493 if (v1->type.t == VT_FLOAT) {
1494 v1->c.f = f1;
1495 } else if (v1->type.t == VT_DOUBLE) {
1496 v1->c.d = f1;
1497 } else {
1498 v1->c.ld = f1;
1499 }
1500 vtop--;
1501 } else {
1502 general_case:
1503 if (!nocode_wanted) {
1504 gen_opf(op);
1505 } else {
1506 vtop--;
1507 }
1508 }
1509 }
1510
1511 static int pointed_size(CType *type)
1512 {
1513 int align;
1514 return type_size(pointed_type(type), &align);
1515 }
1516
1517 static void vla_runtime_pointed_size(CType *type)
1518 {
1519 int align;
1520 vla_runtime_type_size(pointed_type(type), &align);
1521 }
1522
1523 static inline int is_null_pointer(SValue *p)
1524 {
1525 if ((p->r & (VT_VALMASK | VT_LVAL | VT_SYM)) != VT_CONST)
1526 return 0;
1527 return ((p->type.t & VT_BTYPE) == VT_INT && p->c.i == 0) ||
1528 ((p->type.t & VT_BTYPE) == VT_LLONG && p->c.ll == 0) ||
1529 ((p->type.t & VT_BTYPE) == VT_PTR && p->c.ptr == 0);
1530 }
1531
1532 static inline int is_integer_btype(int bt)
1533 {
1534 return (bt == VT_BYTE || bt == VT_SHORT ||
1535 bt == VT_INT || bt == VT_LLONG);
1536 }
1537
1538 /* check types for comparison or substraction of pointers */
1539 static void check_comparison_pointer_types(SValue *p1, SValue *p2, int op)
1540 {
1541 CType *type1, *type2, tmp_type1, tmp_type2;
1542 int bt1, bt2;
1543
1544 /* null pointers are accepted for all comparisons as gcc */
1545 if (is_null_pointer(p1) || is_null_pointer(p2))
1546 return;
1547 type1 = &p1->type;
1548 type2 = &p2->type;
1549 bt1 = type1->t & VT_BTYPE;
1550 bt2 = type2->t & VT_BTYPE;
1551 /* accept comparison between pointer and integer with a warning */
1552 if ((is_integer_btype(bt1) || is_integer_btype(bt2)) && op != '-') {
1553 if (op != TOK_LOR && op != TOK_LAND )
1554 tcc_warning("comparison between pointer and integer");
1555 return;
1556 }
1557
1558 /* both must be pointers or implicit function pointers */
1559 if (bt1 == VT_PTR) {
1560 type1 = pointed_type(type1);
1561 } else if (bt1 != VT_FUNC)
1562 goto invalid_operands;
1563
1564 if (bt2 == VT_PTR) {
1565 type2 = pointed_type(type2);
1566 } else if (bt2 != VT_FUNC) {
1567 invalid_operands:
1568 tcc_error("invalid operands to binary %s", get_tok_str(op, NULL));
1569 }
1570 if ((type1->t & VT_BTYPE) == VT_VOID ||
1571 (type2->t & VT_BTYPE) == VT_VOID)
1572 return;
1573 tmp_type1 = *type1;
1574 tmp_type2 = *type2;
1575 tmp_type1.t &= ~(VT_UNSIGNED | VT_CONSTANT | VT_VOLATILE);
1576 tmp_type2.t &= ~(VT_UNSIGNED | VT_CONSTANT | VT_VOLATILE);
1577 if (!is_compatible_types(&tmp_type1, &tmp_type2)) {
1578 /* gcc-like error if '-' is used */
1579 if (op == '-')
1580 goto invalid_operands;
1581 else
1582 tcc_warning("comparison of distinct pointer types lacks a cast");
1583 }
1584 }
1585
1586 /* generic gen_op: handles types problems */
1587 ST_FUNC void gen_op(int op)
1588 {
1589 int u, t1, t2, bt1, bt2, t;
1590 CType type1;
1591
1592 t1 = vtop[-1].type.t;
1593 t2 = vtop[0].type.t;
1594 bt1 = t1 & VT_BTYPE;
1595 bt2 = t2 & VT_BTYPE;
1596
1597 if (bt1 == VT_PTR || bt2 == VT_PTR) {
1598 /* at least one operand is a pointer */
1599 /* relationnal op: must be both pointers */
1600 if (op >= TOK_ULT && op <= TOK_LOR) {
1601 check_comparison_pointer_types(vtop - 1, vtop, op);
1602 /* pointers are handled are unsigned */
1603 #ifdef TCC_TARGET_X86_64
1604 t = VT_LLONG | VT_UNSIGNED;
1605 #else
1606 t = VT_INT | VT_UNSIGNED;
1607 #endif
1608 goto std_op;
1609 }
1610 /* if both pointers, then it must be the '-' op */
1611 if (bt1 == VT_PTR && bt2 == VT_PTR) {
1612 if (op != '-')
1613 tcc_error("cannot use pointers here");
1614 check_comparison_pointer_types(vtop - 1, vtop, op);
1615 /* XXX: check that types are compatible */
1616 if (vtop[-1].type.t & VT_VLA) {
1617 vla_runtime_pointed_size(&vtop[-1].type);
1618 } else {
1619 vpushi(pointed_size(&vtop[-1].type));
1620 }
1621 vrott(3);
1622 gen_opic(op);
1623 /* set to integer type */
1624 #ifdef TCC_TARGET_X86_64
1625 vtop->type.t = VT_LLONG;
1626 #else
1627 vtop->type.t = VT_INT;
1628 #endif
1629 vswap();
1630 gen_op(TOK_PDIV);
1631 } else {
1632 /* exactly one pointer : must be '+' or '-'. */
1633 if (op != '-' && op != '+')
1634 tcc_error("cannot use pointers here");
1635 /* Put pointer as first operand */
1636 if (bt2 == VT_PTR) {
1637 vswap();
1638 swap(&t1, &t2);
1639 }
1640 type1 = vtop[-1].type;
1641 type1.t &= ~VT_ARRAY;
1642 if (vtop[-1].type.t & VT_VLA)
1643 vla_runtime_pointed_size(&vtop[-1].type);
1644 else {
1645 u = pointed_size(&vtop[-1].type);
1646 if (u < 0)
1647 tcc_error("unknown array element size");
1648 #ifdef TCC_TARGET_X86_64
1649 vpushll(u);
1650 #else
1651 /* XXX: cast to int ? (long long case) */
1652 vpushi(u);
1653 #endif
1654 }
1655 gen_op('*');
1656 #ifdef CONFIG_TCC_BCHECK
1657 /* if evaluating constant expression, no code should be
1658 generated, so no bound check */
1659 if (tcc_state->do_bounds_check && !const_wanted) {
1660 /* if bounded pointers, we generate a special code to
1661 test bounds */
1662 if (op == '-') {
1663 vpushi(0);
1664 vswap();
1665 gen_op('-');
1666 }
1667 gen_bounded_ptr_add();
1668 } else
1669 #endif
1670 {
1671 gen_opic(op);
1672 }
1673 /* put again type if gen_opic() swaped operands */
1674 vtop->type = type1;
1675 }
1676 } else if (is_float(bt1) || is_float(bt2)) {
1677 /* compute bigger type and do implicit casts */
1678 if (bt1 == VT_LDOUBLE || bt2 == VT_LDOUBLE) {
1679 t = VT_LDOUBLE;
1680 } else if (bt1 == VT_DOUBLE || bt2 == VT_DOUBLE) {
1681 t = VT_DOUBLE;
1682 } else {
1683 t = VT_FLOAT;
1684 }
1685 /* floats can only be used for a few operations */
1686 if (op != '+' && op != '-' && op != '*' && op != '/' &&
1687 (op < TOK_ULT || op > TOK_GT))
1688 tcc_error("invalid operands for binary operation");
1689 goto std_op;
1690 } else if (op == TOK_SHR || op == TOK_SAR || op == TOK_SHL) {
1691 t = bt1 == VT_LLONG ? VT_LLONG : VT_INT;
1692 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (t | VT_UNSIGNED))
1693 t |= VT_UNSIGNED;
1694 goto std_op;
1695 } else if (bt1 == VT_LLONG || bt2 == VT_LLONG) {
1696 /* cast to biggest op */
1697 t = VT_LLONG;
1698 /* convert to unsigned if it does not fit in a long long */
1699 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED) ||
1700 (t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED))
1701 t |= VT_UNSIGNED;
1702 goto std_op;
1703 } else if (bt1 == VT_STRUCT || bt2 == VT_STRUCT) {
1704 tcc_error("comparison of struct");
1705 } else {
1706 /* integer operations */
1707 t = VT_INT;
1708 /* convert to unsigned if it does not fit in an integer */
1709 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED) ||
1710 (t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED))
1711 t |= VT_UNSIGNED;
1712 std_op:
1713 /* XXX: currently, some unsigned operations are explicit, so
1714 we modify them here */
1715 if (t & VT_UNSIGNED) {
1716 if (op == TOK_SAR)
1717 op = TOK_SHR;
1718 else if (op == '/')
1719 op = TOK_UDIV;
1720 else if (op == '%')
1721 op = TOK_UMOD;
1722 else if (op == TOK_LT)
1723 op = TOK_ULT;
1724 else if (op == TOK_GT)
1725 op = TOK_UGT;
1726 else if (op == TOK_LE)
1727 op = TOK_ULE;
1728 else if (op == TOK_GE)
1729 op = TOK_UGE;
1730 }
1731 vswap();
1732 type1.t = t;
1733 gen_cast(&type1);
1734 vswap();
1735 /* special case for shifts and long long: we keep the shift as
1736 an integer */
1737 if (op == TOK_SHR || op == TOK_SAR || op == TOK_SHL)
1738 type1.t = VT_INT;
1739 gen_cast(&type1);
1740 if (is_float(t))
1741 gen_opif(op);
1742 else
1743 gen_opic(op);
1744 if (op >= TOK_ULT && op <= TOK_GT) {
1745 /* relationnal op: the result is an int */
1746 vtop->type.t = VT_INT;
1747 } else {
1748 vtop->type.t = t;
1749 }
1750 }
1751 }
1752
1753 #ifndef TCC_TARGET_ARM
1754 /* generic itof for unsigned long long case */
1755 static void gen_cvt_itof1(int t)
1756 {
1757 if ((vtop->type.t & (VT_BTYPE | VT_UNSIGNED)) ==
1758 (VT_LLONG | VT_UNSIGNED)) {
1759
1760 if (t == VT_FLOAT)
1761 vpush_global_sym(&func_old_type, TOK___floatundisf);
1762 #if LDOUBLE_SIZE != 8
1763 else if (t == VT_LDOUBLE)
1764 vpush_global_sym(&func_old_type, TOK___floatundixf);
1765 #endif
1766 else
1767 vpush_global_sym(&func_old_type, TOK___floatundidf);
1768 vrott(2);
1769 gfunc_call(1);
1770 vpushi(0);
1771 vtop->r = reg_fret(t);
1772 } else {
1773 gen_cvt_itof(t);
1774 }
1775 }
1776 #endif
1777
1778 /* generic ftoi for unsigned long long case */
1779 static void gen_cvt_ftoi1(int t)
1780 {
1781 int st;
1782
1783 if (t == (VT_LLONG | VT_UNSIGNED)) {
1784 /* not handled natively */
1785 st = vtop->type.t & VT_BTYPE;
1786 if (st == VT_FLOAT)
1787 vpush_global_sym(&func_old_type, TOK___fixunssfdi);
1788 #if LDOUBLE_SIZE != 8
1789 else if (st == VT_LDOUBLE)
1790 vpush_global_sym(&func_old_type, TOK___fixunsxfdi);
1791 #endif
1792 else
1793 vpush_global_sym(&func_old_type, TOK___fixunsdfdi);
1794 vrott(2);
1795 gfunc_call(1);
1796 vpushi(0);
1797 vtop->r = REG_IRET;
1798 vtop->r2 = REG_LRET;
1799 } else {
1800 gen_cvt_ftoi(t);
1801 }
1802 }
1803
1804 /* force char or short cast */
1805 static void force_charshort_cast(int t)
1806 {
1807 int bits, dbt;
1808 dbt = t & VT_BTYPE;
1809 /* XXX: add optimization if lvalue : just change type and offset */
1810 if (dbt == VT_BYTE)
1811 bits = 8;
1812 else
1813 bits = 16;
1814 if (t & VT_UNSIGNED) {
1815 vpushi((1 << bits) - 1);
1816 gen_op('&');
1817 } else {
1818 bits = 32 - bits;
1819 vpushi(bits);
1820 gen_op(TOK_SHL);
1821 /* result must be signed or the SAR is converted to an SHL
1822 This was not the case when "t" was a signed short
1823 and the last value on the stack was an unsigned int */
1824 vtop->type.t &= ~VT_UNSIGNED;
1825 vpushi(bits);
1826 gen_op(TOK_SAR);
1827 }
1828 }
1829
1830 /* cast 'vtop' to 'type'. Casting to bitfields is forbidden. */
1831 static void gen_cast(CType *type)
1832 {
1833 int sbt, dbt, sf, df, c, p;
1834
1835 /* special delayed cast for char/short */
1836 /* XXX: in some cases (multiple cascaded casts), it may still
1837 be incorrect */
1838 if (vtop->r & VT_MUSTCAST) {
1839 vtop->r &= ~VT_MUSTCAST;
1840 force_charshort_cast(vtop->type.t);
1841 }
1842
1843 /* bitfields first get cast to ints */
1844 if (vtop->type.t & VT_BITFIELD) {
1845 gv(RC_INT);
1846 }
1847
1848 dbt = type->t & (VT_BTYPE | VT_UNSIGNED);
1849 sbt = vtop->type.t & (VT_BTYPE | VT_UNSIGNED);
1850
1851 if (sbt != dbt) {
1852 sf = is_float(sbt);
1853 df = is_float(dbt);
1854 c = (vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1855 p = (vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == (VT_CONST | VT_SYM);
1856 if (c) {
1857 /* constant case: we can do it now */
1858 /* XXX: in ISOC, cannot do it if error in convert */
1859 if (sbt == VT_FLOAT)
1860 vtop->c.ld = vtop->c.f;
1861 else if (sbt == VT_DOUBLE)
1862 vtop->c.ld = vtop->c.d;
1863
1864 if (df) {
1865 if ((sbt & VT_BTYPE) == VT_LLONG) {
1866 if (sbt & VT_UNSIGNED)
1867 vtop->c.ld = vtop->c.ull;
1868 else
1869 vtop->c.ld = vtop->c.ll;
1870 } else if(!sf) {
1871 if (sbt & VT_UNSIGNED)
1872 vtop->c.ld = vtop->c.ui;
1873 else
1874 vtop->c.ld = vtop->c.i;
1875 }
1876
1877 if (dbt == VT_FLOAT)
1878 vtop->c.f = (float)vtop->c.ld;
1879 else if (dbt == VT_DOUBLE)
1880 vtop->c.d = (double)vtop->c.ld;
1881 } else if (sf && dbt == (VT_LLONG|VT_UNSIGNED)) {
1882 vtop->c.ull = (unsigned long long)vtop->c.ld;
1883 } else if (sf && dbt == VT_BOOL) {
1884 vtop->c.i = (vtop->c.ld != 0);
1885 } else {
1886 if(sf)
1887 vtop->c.ll = (long long)vtop->c.ld;
1888 else if (sbt == (VT_LLONG|VT_UNSIGNED))
1889 vtop->c.ll = vtop->c.ull;
1890 else if (sbt & VT_UNSIGNED)
1891 vtop->c.ll = vtop->c.ui;
1892 #ifdef TCC_TARGET_X86_64
1893 else if (sbt == VT_PTR)
1894 ;
1895 #endif
1896 else if (sbt != VT_LLONG)
1897 vtop->c.ll = vtop->c.i;
1898
1899 if (dbt == (VT_LLONG|VT_UNSIGNED))
1900 vtop->c.ull = vtop->c.ll;
1901 else if (dbt == VT_BOOL)
1902 vtop->c.i = (vtop->c.ll != 0);
1903 else if (dbt != VT_LLONG) {
1904 int s = 0;
1905 if ((dbt & VT_BTYPE) == VT_BYTE)
1906 s = 24;
1907 else if ((dbt & VT_BTYPE) == VT_SHORT)
1908 s = 16;
1909
1910 if(dbt & VT_UNSIGNED)
1911 vtop->c.ui = ((unsigned int)vtop->c.ll << s) >> s;
1912 else
1913 vtop->c.i = ((int)vtop->c.ll << s) >> s;
1914 }
1915 }
1916 } else if (p && dbt == VT_BOOL) {
1917 vtop->r = VT_CONST;
1918 vtop->c.i = 1;
1919 } else if (!nocode_wanted) {
1920 /* non constant case: generate code */
1921 if (sf && df) {
1922 /* convert from fp to fp */
1923 gen_cvt_ftof(dbt);
1924 } else if (df) {
1925 /* convert int to fp */
1926 gen_cvt_itof1(dbt);
1927 } else if (sf) {
1928 /* convert fp to int */
1929 if (dbt == VT_BOOL) {
1930 vpushi(0);
1931 gen_op(TOK_NE);
1932 } else {
1933 /* we handle char/short/etc... with generic code */
1934 if (dbt != (VT_INT | VT_UNSIGNED) &&
1935 dbt != (VT_LLONG | VT_UNSIGNED) &&
1936 dbt != VT_LLONG)
1937 dbt = VT_INT;
1938 gen_cvt_ftoi1(dbt);
1939 if (dbt == VT_INT && (type->t & (VT_BTYPE | VT_UNSIGNED)) != dbt) {
1940 /* additional cast for char/short... */
1941 vtop->type.t = dbt;
1942 gen_cast(type);
1943 }
1944 }
1945 #ifndef TCC_TARGET_X86_64
1946 } else if ((dbt & VT_BTYPE) == VT_LLONG) {
1947 if ((sbt & VT_BTYPE) != VT_LLONG) {
1948 /* scalar to long long */
1949 /* machine independent conversion */
1950 gv(RC_INT);
1951 /* generate high word */
1952 if (sbt == (VT_INT | VT_UNSIGNED)) {
1953 vpushi(0);
1954 gv(RC_INT);
1955 } else {
1956 if (sbt == VT_PTR) {
1957 /* cast from pointer to int before we apply
1958 shift operation, which pointers don't support*/
1959 gen_cast(&int_type);
1960 }
1961 gv_dup();
1962 vpushi(31);
1963 gen_op(TOK_SAR);
1964 }
1965 /* patch second register */
1966 vtop[-1].r2 = vtop->r;
1967 vpop();
1968 }
1969 #else
1970 } else if ((dbt & VT_BTYPE) == VT_LLONG ||
1971 (dbt & VT_BTYPE) == VT_PTR ||
1972 (dbt & VT_BTYPE) == VT_FUNC) {
1973 if ((sbt & VT_BTYPE) != VT_LLONG &&
1974 (sbt & VT_BTYPE) != VT_PTR &&
1975 (sbt & VT_BTYPE) != VT_FUNC) {
1976 /* need to convert from 32bit to 64bit */
1977 int r = gv(RC_INT);
1978 if (sbt != (VT_INT | VT_UNSIGNED)) {
1979 /* x86_64 specific: movslq */
1980 o(0x6348);
1981 o(0xc0 + (REG_VALUE(r) << 3) + REG_VALUE(r));
1982 }
1983 }
1984 #endif
1985 } else if (dbt == VT_BOOL) {
1986 /* scalar to bool */
1987 vpushi(0);
1988 gen_op(TOK_NE);
1989 } else if ((dbt & VT_BTYPE) == VT_BYTE ||
1990 (dbt & VT_BTYPE) == VT_SHORT) {
1991 if (sbt == VT_PTR) {
1992 vtop->type.t = VT_INT;
1993 tcc_warning("nonportable conversion from pointer to char/short");
1994 }
1995 force_charshort_cast(dbt);
1996 } else if ((dbt & VT_BTYPE) == VT_INT) {
1997 /* scalar to int */
1998 if (sbt == VT_LLONG) {
1999 /* from long long: just take low order word */
2000 lexpand();
2001 vpop();
2002 }
2003 /* if lvalue and single word type, nothing to do because
2004 the lvalue already contains the real type size (see
2005 VT_LVAL_xxx constants) */
2006 }
2007 }
2008 } else if ((dbt & VT_BTYPE) == VT_PTR && !(vtop->r & VT_LVAL)) {
2009 /* if we are casting between pointer types,
2010 we must update the VT_LVAL_xxx size */
2011 vtop->r = (vtop->r & ~VT_LVAL_TYPE)
2012 | (lvalue_type(type->ref->type.t) & VT_LVAL_TYPE);
2013 }
2014 vtop->type = *type;
2015 }
2016
2017 /* return type size as known at compile time. Put alignment at 'a' */
2018 ST_FUNC int type_size(CType *type, int *a)
2019 {
2020 Sym *s;
2021 int bt;
2022
2023 bt = type->t & VT_BTYPE;
2024 if (bt == VT_STRUCT) {
2025 /* struct/union */
2026 s = type->ref;
2027 *a = s->r;
2028 return s->c;
2029 } else if (bt == VT_PTR) {
2030 if (type->t & VT_ARRAY) {
2031 int ts;
2032
2033 s = type->ref;
2034 ts = type_size(&s->type, a);
2035
2036 if (ts < 0 && s->c < 0)
2037 ts = -ts;
2038
2039 return ts * s->c;
2040 } else {
2041 *a = PTR_SIZE;
2042 return PTR_SIZE;
2043 }
2044 } else if (bt == VT_LDOUBLE) {
2045 *a = LDOUBLE_ALIGN;
2046 return LDOUBLE_SIZE;
2047 } else if (bt == VT_DOUBLE || bt == VT_LLONG) {
2048 #ifdef TCC_TARGET_I386
2049 #ifdef TCC_TARGET_PE
2050 *a = 8;
2051 #else
2052 *a = 4;
2053 #endif
2054 #elif defined(TCC_TARGET_ARM)
2055 #ifdef TCC_ARM_EABI
2056 *a = 8;
2057 #else
2058 *a = 4;
2059 #endif
2060 #else
2061 *a = 8;
2062 #endif
2063 return 8;
2064 } else if (bt == VT_INT || bt == VT_ENUM || bt == VT_FLOAT) {
2065 *a = 4;
2066 return 4;
2067 } else if (bt == VT_SHORT) {
2068 *a = 2;
2069 return 2;
2070 } else {
2071 /* char, void, function, _Bool */
2072 *a = 1;
2073 return 1;
2074 }
2075 }
2076
2077 /* push type size as known at runtime time on top of value stack. Put
2078 alignment at 'a' */
2079 ST_FUNC void vla_runtime_type_size(CType *type, int *a)
2080 {
2081 if (type->t & VT_VLA) {
2082 vset(&int_type, VT_LOCAL|VT_LVAL, type->ref->c);
2083 } else {
2084 vpushi(type_size(type, a));
2085 }
2086 }
2087
2088 /* return the pointed type of t */
2089 static inline CType *pointed_type(CType *type)
2090 {
2091 return &type->ref->type;
2092 }
2093
2094 /* modify type so that its it is a pointer to type. */
2095 ST_FUNC void mk_pointer(CType *type)
2096 {
2097 Sym *s;
2098 s = sym_push(SYM_FIELD, type, 0, -1);
2099 type->t = VT_PTR | (type->t & ~VT_TYPE);
2100 type->ref = s;
2101 }
2102
2103 /* compare function types. OLD functions match any new functions */
2104 static int is_compatible_func(CType *type1, CType *type2)
2105 {
2106 Sym *s1, *s2;
2107
2108 s1 = type1->ref;
2109 s2 = type2->ref;
2110 if (!is_compatible_types(&s1->type, &s2->type))
2111 return 0;
2112 /* check func_call */
2113 if (FUNC_CALL(s1->r) != FUNC_CALL(s2->r))
2114 return 0;
2115 /* XXX: not complete */
2116 if (s1->c == FUNC_OLD || s2->c == FUNC_OLD)
2117 return 1;
2118 if (s1->c != s2->c)
2119 return 0;
2120 while (s1 != NULL) {
2121 if (s2 == NULL)
2122 return 0;
2123 if (!is_compatible_parameter_types(&s1->type, &s2->type))
2124 return 0;
2125 s1 = s1->next;
2126 s2 = s2->next;
2127 }
2128 if (s2)
2129 return 0;
2130 return 1;
2131 }
2132
2133 /* return true if type1 and type2 are the same. If unqualified is
2134 true, qualifiers on the types are ignored.
2135
2136 - enums are not checked as gcc __builtin_types_compatible_p ()
2137 */
2138 static int compare_types(CType *type1, CType *type2, int unqualified)
2139 {
2140 int bt1, t1, t2;
2141
2142 t1 = type1->t & VT_TYPE;
2143 t2 = type2->t & VT_TYPE;
2144 if (unqualified) {
2145 /* strip qualifiers before comparing */
2146 t1 &= ~(VT_CONSTANT | VT_VOLATILE);
2147 t2 &= ~(VT_CONSTANT | VT_VOLATILE);
2148 }
2149 /* XXX: bitfields ? */
2150 if (t1 != t2)
2151 return 0;
2152 /* test more complicated cases */
2153 bt1 = t1 & VT_BTYPE;
2154 if (bt1 == VT_PTR) {
2155 type1 = pointed_type(type1);
2156 type2 = pointed_type(type2);
2157 return is_compatible_types(type1, type2);
2158 } else if (bt1 == VT_STRUCT) {
2159 return (type1->ref == type2->ref);
2160 } else if (bt1 == VT_FUNC) {
2161 return is_compatible_func(type1, type2);
2162 } else {
2163 return 1;
2164 }
2165 }
2166
2167 /* return true if type1 and type2 are exactly the same (including
2168 qualifiers).
2169 */
2170 static int is_compatible_types(CType *type1, CType *type2)
2171 {
2172 return compare_types(type1,type2,0);
2173 }
2174
2175 /* return true if type1 and type2 are the same (ignoring qualifiers).
2176 */
2177 static int is_compatible_parameter_types(CType *type1, CType *type2)
2178 {
2179 return compare_types(type1,type2,1);
2180 }
2181
2182 /* print a type. If 'varstr' is not NULL, then the variable is also
2183 printed in the type */
2184 /* XXX: union */
2185 /* XXX: add array and function pointers */
2186 static void type_to_str(char *buf, int buf_size,
2187 CType *type, const char *varstr)
2188 {
2189 int bt, v, t;
2190 Sym *s, *sa;
2191 char buf1[256];
2192 const char *tstr;
2193
2194 t = type->t & VT_TYPE;
2195 bt = t & VT_BTYPE;
2196 buf[0] = '\0';
2197 if (t & VT_CONSTANT)
2198 pstrcat(buf, buf_size, "const ");
2199 if (t & VT_VOLATILE)
2200 pstrcat(buf, buf_size, "volatile ");
2201 if (t & VT_UNSIGNED)
2202 pstrcat(buf, buf_size, "unsigned ");
2203 switch(bt) {
2204 case VT_VOID:
2205 tstr = "void";
2206 goto add_tstr;
2207 case VT_BOOL:
2208 tstr = "_Bool";
2209 goto add_tstr;
2210 case VT_BYTE:
2211 tstr = "char";
2212 goto add_tstr;
2213 case VT_SHORT:
2214 tstr = "short";
2215 goto add_tstr;
2216 case VT_INT:
2217 tstr = "int";
2218 goto add_tstr;
2219 case VT_LONG:
2220 tstr = "long";
2221 goto add_tstr;
2222 case VT_LLONG:
2223 tstr = "long long";
2224 goto add_tstr;
2225 case VT_FLOAT:
2226 tstr = "float";
2227 goto add_tstr;
2228 case VT_DOUBLE:
2229 tstr = "double";
2230 goto add_tstr;
2231 case VT_LDOUBLE:
2232 tstr = "long double";
2233 add_tstr:
2234 pstrcat(buf, buf_size, tstr);
2235 break;
2236 case VT_ENUM:
2237 case VT_STRUCT:
2238 if (bt == VT_STRUCT)
2239 tstr = "struct ";
2240 else
2241 tstr = "enum ";
2242 pstrcat(buf, buf_size, tstr);
2243 v = type->ref->v & ~SYM_STRUCT;
2244 if (v >= SYM_FIRST_ANOM)
2245 pstrcat(buf, buf_size, "<anonymous>");
2246 else
2247 pstrcat(buf, buf_size, get_tok_str(v, NULL));
2248 break;
2249 case VT_FUNC:
2250 s = type->ref;
2251 type_to_str(buf, buf_size, &s->type, varstr);
2252 pstrcat(buf, buf_size, "(");
2253 sa = s->next;
2254 while (sa != NULL) {
2255 type_to_str(buf1, sizeof(buf1), &sa->type, NULL);
2256 pstrcat(buf, buf_size, buf1);
2257 sa = sa->next;
2258 if (sa)
2259 pstrcat(buf, buf_size, ", ");
2260 }
2261 pstrcat(buf, buf_size, ")");
2262 goto no_var;
2263 case VT_PTR:
2264 s = type->ref;
2265 pstrcpy(buf1, sizeof(buf1), "*");
2266 if (varstr)
2267 pstrcat(buf1, sizeof(buf1), varstr);
2268 type_to_str(buf, buf_size, &s->type, buf1);
2269 goto no_var;
2270 }
2271 if (varstr) {
2272 pstrcat(buf, buf_size, " ");
2273 pstrcat(buf, buf_size, varstr);
2274 }
2275 no_var: ;
2276 }
2277
2278 /* verify type compatibility to store vtop in 'dt' type, and generate
2279 casts if needed. */
2280 static void gen_assign_cast(CType *dt)
2281 {
2282 CType *st, *type1, *type2, tmp_type1, tmp_type2;
2283 char buf1[256], buf2[256];
2284 int dbt, sbt;
2285
2286 st = &vtop->type; /* source type */
2287 dbt = dt->t & VT_BTYPE;
2288 sbt = st->t & VT_BTYPE;
2289 if (sbt == VT_VOID)
2290 tcc_error("Cannot assign void value");
2291 if (dt->t & VT_CONSTANT)
2292 tcc_warning("assignment of read-only location");
2293 switch(dbt) {
2294 case VT_PTR:
2295 /* special cases for pointers */
2296 /* '0' can also be a pointer */
2297 if (is_null_pointer(vtop))
2298 goto type_ok;
2299 /* accept implicit pointer to integer cast with warning */
2300 if (is_integer_btype(sbt)) {
2301 tcc_warning("assignment makes pointer from integer without a cast");
2302 goto type_ok;
2303 }
2304 type1 = pointed_type(dt);
2305 /* a function is implicitely a function pointer */
2306 if (sbt == VT_FUNC) {
2307 if ((type1->t & VT_BTYPE) != VT_VOID &&
2308 !is_compatible_types(pointed_type(dt), st))
2309 tcc_warning("assignment from incompatible pointer type");
2310 goto type_ok;
2311 }
2312 if (sbt != VT_PTR)
2313 goto error;
2314 type2 = pointed_type(st);
2315 if ((type1->t & VT_BTYPE) == VT_VOID ||
2316 (type2->t & VT_BTYPE) == VT_VOID) {
2317 /* void * can match anything */
2318 } else {
2319 /* exact type match, except for unsigned */
2320 tmp_type1 = *type1;
2321 tmp_type2 = *type2;
2322 tmp_type1.t &= ~(VT_UNSIGNED | VT_CONSTANT | VT_VOLATILE);
2323 tmp_type2.t &= ~(VT_UNSIGNED | VT_CONSTANT | VT_VOLATILE);
2324 if (!is_compatible_types(&tmp_type1, &tmp_type2))
2325 tcc_warning("assignment from incompatible pointer type");
2326 }
2327 /* check const and volatile */
2328 if ((!(type1->t & VT_CONSTANT) && (type2->t & VT_CONSTANT)) ||
2329 (!(type1->t & VT_VOLATILE) && (type2->t & VT_VOLATILE)))
2330 tcc_warning("assignment discards qualifiers from pointer target type");
2331 break;
2332 case VT_BYTE:
2333 case VT_SHORT:
2334 case VT_INT:
2335 case VT_LLONG:
2336 if (sbt == VT_PTR || sbt == VT_FUNC) {
2337 tcc_warning("assignment makes integer from pointer without a cast");
2338 }
2339 /* XXX: more tests */
2340 break;
2341 case VT_STRUCT:
2342 tmp_type1 = *dt;
2343 tmp_type2 = *st;
2344 tmp_type1.t &= ~(VT_CONSTANT | VT_VOLATILE);
2345 tmp_type2.t &= ~(VT_CONSTANT | VT_VOLATILE);
2346 if (!is_compatible_types(&tmp_type1, &tmp_type2)) {
2347 error:
2348 type_to_str(buf1, sizeof(buf1), st, NULL);
2349 type_to_str(buf2, sizeof(buf2), dt, NULL);
2350 tcc_error("cannot cast '%s' to '%s'", buf1, buf2);
2351 }
2352 break;
2353 }
2354 type_ok:
2355 gen_cast(dt);
2356 }
2357
2358 /* store vtop in lvalue pushed on stack */
2359 ST_FUNC void vstore(void)
2360 {
2361 int sbt, dbt, ft, r, t, size, align, bit_size, bit_pos, rc, delayed_cast;
2362
2363 ft = vtop[-1].type.t;
2364 sbt = vtop->type.t & VT_BTYPE;
2365 dbt = ft & VT_BTYPE;
2366 if ((((sbt == VT_INT || sbt == VT_SHORT) && dbt == VT_BYTE) ||
2367 (sbt == VT_INT && dbt == VT_SHORT))
2368 && !(vtop->type.t & VT_BITFIELD)) {
2369 /* optimize char/short casts */
2370 delayed_cast = VT_MUSTCAST;
2371 vtop->type.t = ft & (VT_TYPE & ~(VT_BITFIELD | (-1 << VT_STRUCT_SHIFT)));
2372 /* XXX: factorize */
2373 if (ft & VT_CONSTANT)
2374 tcc_warning("assignment of read-only location");
2375 } else {
2376 delayed_cast = 0;
2377 if (!(ft & VT_BITFIELD))
2378 gen_assign_cast(&vtop[-1].type);
2379 }
2380
2381 if (sbt == VT_STRUCT) {
2382 /* if structure, only generate pointer */
2383 /* structure assignment : generate memcpy */
2384 /* XXX: optimize if small size */
2385 if (!nocode_wanted) {
2386 size = type_size(&vtop->type, &align);
2387
2388 /* destination */
2389 vswap();
2390 vtop->type.t = VT_PTR;
2391 gaddrof();
2392
2393 /* address of memcpy() */
2394 #ifdef TCC_ARM_EABI
2395 if(!(align & 7))
2396 vpush_global_sym(&func_old_type, TOK_memcpy8);
2397 else if(!(align & 3))
2398 vpush_global_sym(&func_old_type, TOK_memcpy4);
2399 else
2400 #endif
2401 vpush_global_sym(&func_old_type, TOK_memcpy);
2402
2403 vswap();
2404 /* source */
2405 vpushv(vtop - 2);
2406 vtop->type.t = VT_PTR;
2407 gaddrof();
2408 /* type size */
2409 vpushi(size);
2410 gfunc_call(3);
2411 } else {
2412 vswap();
2413 vpop();
2414 }
2415 /* leave source on stack */
2416 } else if (ft & VT_BITFIELD) {
2417 /* bitfield store handling */
2418 bit_pos = (ft >> VT_STRUCT_SHIFT) & 0x3f;
2419 bit_size = (ft >> (VT_STRUCT_SHIFT + 6)) & 0x3f;
2420 /* remove bit field info to avoid loops */
2421 vtop[-1].type.t = ft & ~(VT_BITFIELD | (-1 << VT_STRUCT_SHIFT));
2422
2423 /* duplicate source into other register */
2424 gv_dup();
2425 vswap();
2426 vrott(3);
2427
2428 if((ft & VT_BTYPE) == VT_BOOL) {
2429 gen_cast(&vtop[-1].type);
2430 vtop[-1].type.t = (vtop[-1].type.t & ~VT_BTYPE) | (VT_BYTE | VT_UNSIGNED);
2431 }
2432
2433 /* duplicate destination */
2434 vdup();
2435 vtop[-1] = vtop[-2];
2436
2437 /* mask and shift source */
2438 if((ft & VT_BTYPE) != VT_BOOL) {
2439 if((ft & VT_BTYPE) == VT_LLONG) {
2440 vpushll((1ULL << bit_size) - 1ULL);
2441 } else {
2442 vpushi((1 << bit_size) - 1);
2443 }
2444 gen_op('&');
2445 }
2446 vpushi(bit_pos);
2447 gen_op(TOK_SHL);
2448 /* load destination, mask and or with source */
2449 vswap();
2450 if((ft & VT_BTYPE) == VT_LLONG) {
2451 vpushll(~(((1ULL << bit_size) - 1ULL) << bit_pos));
2452 } else {
2453 vpushi(~(((1 << bit_size) - 1) << bit_pos));
2454 }
2455 gen_op('&');
2456 gen_op('|');
2457 /* store result */
2458 vstore();
2459
2460 /* pop off shifted source from "duplicate source..." above */
2461 vpop();
2462
2463 } else {
2464 #ifdef CONFIG_TCC_BCHECK
2465 /* bound check case */
2466 if (vtop[-1].r & VT_MUSTBOUND) {
2467 vswap();
2468 gbound();
2469 vswap();
2470 }
2471 #endif
2472 if (!nocode_wanted) {
2473 rc = RC_INT;
2474 if (is_float(ft)) {
2475 rc = RC_FLOAT;
2476 #ifdef TCC_TARGET_X86_64
2477 if ((ft & VT_BTYPE) == VT_LDOUBLE) {
2478 rc = RC_ST0;
2479 }
2480 #endif
2481 }
2482 r = gv(rc); /* generate value */
2483 /* if lvalue was saved on stack, must read it */
2484 if ((vtop[-1].r & VT_VALMASK) == VT_LLOCAL) {
2485 SValue sv;
2486 t = get_reg(RC_INT);
2487 #ifdef TCC_TARGET_X86_64
2488 sv.type.t = VT_PTR;
2489 #else
2490 sv.type.t = VT_INT;
2491 #endif
2492 sv.r = VT_LOCAL | VT_LVAL;
2493 sv.c.ul = vtop[-1].c.ul;
2494 load(t, &sv);
2495 vtop[-1].r = t | VT_LVAL;
2496 }
2497 store(r, vtop - 1);
2498 #ifndef TCC_TARGET_X86_64
2499 /* two word case handling : store second register at word + 4 */
2500 if ((ft & VT_BTYPE) == VT_LLONG) {
2501 vswap();
2502 /* convert to int to increment easily */
2503 vtop->type.t = VT_INT;
2504 gaddrof();
2505 vpushi(4);
2506 gen_op('+');
2507 vtop->r |= VT_LVAL;
2508 vswap();
2509 /* XXX: it works because r2 is spilled last ! */
2510 store(vtop->r2, vtop - 1);
2511 }
2512 #endif
2513 }
2514 vswap();
2515 vtop--; /* NOT vpop() because on x86 it would flush the fp stack */
2516 vtop->r |= delayed_cast;
2517 }
2518 }
2519
2520 /* post defines POST/PRE add. c is the token ++ or -- */
2521 ST_FUNC void inc(int post, int c)
2522 {
2523 test_lvalue();
2524 vdup(); /* save lvalue */
2525 if (post) {
2526 gv_dup(); /* duplicate value */
2527 vrotb(3);
2528 vrotb(3);
2529 }
2530 /* add constant */
2531 vpushi(c - TOK_MID);
2532 gen_op('+');
2533 vstore(); /* store value */
2534 if (post)
2535 vpop(); /* if post op, return saved value */
2536 }
2537
2538 /* Parse GNUC __attribute__ extension. Currently, the following
2539 extensions are recognized:
2540 - aligned(n) : set data/function alignment.
2541 - packed : force data alignment to 1
2542 - section(x) : generate data/code in this section.
2543 - unused : currently ignored, but may be used someday.
2544 - regparm(n) : pass function parameters in registers (i386 only)
2545 */
2546 static void parse_attribute(AttributeDef *ad)
2547 {
2548 int t, n;
2549
2550 while (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2) {
2551 next();
2552 skip('(');
2553 skip('(');
2554 while (tok != ')') {
2555 if (tok < TOK_IDENT)
2556 expect("attribute name");
2557 t = tok;
2558 next();
2559 switch(t) {
2560 case TOK_SECTION1:
2561 case TOK_SECTION2:
2562 skip('(');
2563 if (tok != TOK_STR)
2564 expect("section name");
2565 ad->section = find_section(tcc_state, (char *)tokc.cstr->data);
2566 next();
2567 skip(')');
2568 break;
2569 case TOK_ALIAS1:
2570 case TOK_ALIAS2:
2571 skip('(');
2572 if (tok != TOK_STR)
2573 expect("alias(\"target\")");
2574 ad->alias_target = /* save string as token, for later */
2575 tok_alloc((char*)tokc.cstr->data, tokc.cstr->size-1)->tok;
2576 next();
2577 skip(')');
2578 break;
2579 case TOK_ALIGNED1:
2580 case TOK_ALIGNED2:
2581 if (tok == '(') {
2582 next();
2583 n = expr_const();
2584 if (n <= 0 || (n & (n - 1)) != 0)
2585 tcc_error("alignment must be a positive power of two");
2586 skip(')');
2587 } else {
2588 n = MAX_ALIGN;
2589 }
2590 ad->aligned = n;
2591 break;
2592 case TOK_PACKED1:
2593 case TOK_PACKED2:
2594 ad->packed = 1;
2595 break;
2596 case TOK_WEAK1:
2597 case TOK_WEAK2:
2598 ad->weak = 1;
2599 break;
2600 case TOK_UNUSED1:
2601 case TOK_UNUSED2:
2602 /* currently, no need to handle it because tcc does not
2603 track unused objects */
2604 break;
2605 case TOK_NORETURN1:
2606 case TOK_NORETURN2:
2607 /* currently, no need to handle it because tcc does not
2608 track unused objects */
2609 break;
2610 case TOK_CDECL1:
2611 case TOK_CDECL2:
2612 case TOK_CDECL3:
2613 ad->func_call = FUNC_CDECL;
2614 break;
2615 case TOK_STDCALL1:
2616 case TOK_STDCALL2:
2617 case TOK_STDCALL3:
2618 ad->func_call = FUNC_STDCALL;
2619 break;
2620 #ifdef TCC_TARGET_I386
2621 case TOK_REGPARM1:
2622 case TOK_REGPARM2:
2623 skip('(');
2624 n = expr_const();
2625 if (n > 3)
2626 n = 3;
2627 else if (n < 0)
2628 n = 0;
2629 if (n > 0)
2630 ad->func_call = FUNC_FASTCALL1 + n - 1;
2631 skip(')');
2632 break;
2633 case TOK_FASTCALL1:
2634 case TOK_FASTCALL2:
2635 case TOK_FASTCALL3:
2636 ad->func_call = FUNC_FASTCALLW;
2637 break;
2638 #endif
2639 case TOK_MODE:
2640 skip('(');
2641 switch(tok) {
2642 case TOK_MODE_DI:
2643 ad->mode = VT_LLONG + 1;
2644 break;
2645 case TOK_MODE_HI:
2646 ad->mode = VT_SHORT + 1;
2647 break;
2648 case TOK_MODE_SI:
2649 ad->mode = VT_INT + 1;
2650 break;
2651 default:
2652 tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok, NULL));
2653 break;
2654 }
2655 next();
2656 skip(')');
2657 break;
2658 case TOK_DLLEXPORT:
2659 ad->func_export = 1;
2660 break;
2661 case TOK_DLLIMPORT:
2662 ad->func_import = 1;
2663 break;
2664 default:
2665 if (tcc_state->warn_unsupported)
2666 tcc_warning("'%s' attribute ignored", get_tok_str(t, NULL));
2667 /* skip parameters */
2668 if (tok == '(') {
2669 int parenthesis = 0;
2670 do {
2671 if (tok == '(')
2672 parenthesis++;
2673 else if (tok == ')')
2674 parenthesis--;
2675 next();
2676 } while (parenthesis && tok != -1);
2677 }
2678 break;
2679 }
2680 if (tok != ',')
2681 break;
2682 next();
2683 }
2684 skip(')');
2685 skip(')');
2686 }
2687 }
2688
2689 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
2690 static void struct_decl(CType *type, int u)
2691 {
2692 int a, v, size, align, maxalign, c, offset;
2693 int bit_size, bit_pos, bsize, bt, lbit_pos, prevbt;
2694 Sym *s, *ss, *ass, **ps;
2695 AttributeDef ad;
2696 CType type1, btype;
2697
2698 a = tok; /* save decl type */
2699 next();
2700 if (tok != '{') {
2701 v = tok;
2702 next();
2703 /* struct already defined ? return it */
2704 if (v < TOK_IDENT)
2705 expect("struct/union/enum name");
2706 s = struct_find(v);
2707 if (s) {
2708 if (s->type.t != a)
2709 tcc_error("invalid type");
2710 goto do_decl;
2711 }
2712 } else {
2713 v = anon_sym++;
2714 }
2715 type1.t = a;
2716 /* we put an undefined size for struct/union */
2717 s = sym_push(v | SYM_STRUCT, &type1, 0, -1);
2718 s->r = 0; /* default alignment is zero as gcc */
2719 /* put struct/union/enum name in type */
2720 do_decl:
2721 type->t = u;
2722 type->ref = s;
2723
2724 if (tok == '{') {
2725 next();
2726 if (s->c != -1)
2727 tcc_error("struct/union/enum already defined");
2728 /* cannot be empty */
2729 c = 0;
2730 /* non empty enums are not allowed */
2731 if (a == TOK_ENUM) {
2732 for(;;) {
2733 v = tok;
2734 if (v < TOK_UIDENT)
2735 expect("identifier");
2736 next();
2737 if (tok == '=') {
2738 next();
2739 c = expr_const();
2740 }
2741 /* enum symbols have static storage */
2742 ss = sym_push(v, &int_type, VT_CONST, c);
2743 ss->type.t |= VT_STATIC;
2744 if (tok != ',')
2745 break;
2746 next();
2747 c++;
2748 /* NOTE: we accept a trailing comma */
2749 if (tok == '}')
2750 break;
2751 }
2752 skip('}');
2753 } else {
2754 maxalign = 1;
2755 ps = &s->next;
2756 prevbt = VT_INT;
2757 bit_pos = 0;
2758 offset = 0;
2759 while (tok != '}') {
2760 parse_btype(&btype, &ad);
2761 while (1) {
2762 bit_size = -1;
2763 v = 0;
2764 type1 = btype;
2765 if (tok != ':') {
2766 type_decl(&type1, &ad, &v, TYPE_DIRECT | TYPE_ABSTRACT);
2767 if (v == 0 && (type1.t & VT_BTYPE) != VT_STRUCT)
2768 expect("identifier");
2769 if ((type1.t & VT_BTYPE) == VT_FUNC ||
2770 (type1.t & (VT_TYPEDEF | VT_STATIC | VT_EXTERN | VT_INLINE)))
2771 tcc_error("invalid type for '%s'",
2772 get_tok_str(v, NULL));
2773 }
2774 if (tok == ':') {
2775 next();
2776 bit_size = expr_const();
2777 /* XXX: handle v = 0 case for messages */
2778 if (bit_size < 0)
2779 tcc_error("negative width in bit-field '%s'",
2780 get_tok_str(v, NULL));
2781 if (v && bit_size == 0)
2782 tcc_error("zero width for bit-field '%s'",
2783 get_tok_str(v, NULL));
2784 }
2785 size = type_size(&type1, &align);
2786 if (ad.aligned) {
2787 if (align < ad.aligned)
2788 align = ad.aligned;
2789 } else if (ad.packed) {
2790 align = 1;
2791 } else if (*tcc_state->pack_stack_ptr) {
2792 if (align > *tcc_state->pack_stack_ptr)
2793 align = *tcc_state->pack_stack_ptr;
2794 }
2795 lbit_pos = 0;
2796 if (bit_size >= 0) {
2797 bt = type1.t & VT_BTYPE;
2798 if (bt != VT_INT &&
2799 bt != VT_BYTE &&
2800 bt != VT_SHORT &&
2801 bt != VT_BOOL &&
2802 bt != VT_ENUM &&
2803 bt != VT_LLONG)
2804 tcc_error("bitfields must have scalar type");
2805 bsize = size * 8;
2806 if (bit_size > bsize) {
2807 tcc_error("width of '%s' exceeds its type",
2808 get_tok_str(v, NULL));
2809 } else if (bit_size == bsize) {
2810 /* no need for bit fields */
2811 bit_pos = 0;
2812 } else if (bit_size == 0) {
2813 /* XXX: what to do if only padding in a
2814 structure ? */
2815 /* zero size: means to pad */
2816 bit_pos = 0;
2817 } else {
2818 /* we do not have enough room ?
2819 did the type change?
2820 is it a union? */
2821 if ((bit_pos + bit_size) > bsize ||
2822 bt != prevbt || a == TOK_UNION)
2823 bit_pos = 0;
2824 lbit_pos = bit_pos;
2825 /* XXX: handle LSB first */
2826 type1.t |= VT_BITFIELD |
2827 (bit_pos << VT_STRUCT_SHIFT) |
2828 (bit_size << (VT_STRUCT_SHIFT + 6));
2829 bit_pos += bit_size;
2830 }
2831 prevbt = bt;
2832 } else {
2833 bit_pos = 0;
2834 }
2835 if (v != 0 || (type1.t & VT_BTYPE) == VT_STRUCT) {
2836 /* add new memory data only if starting
2837 bit field */
2838 if (lbit_pos == 0) {
2839 if (a == TOK_STRUCT) {
2840 c = (c + align - 1) & -align;
2841 offset = c;
2842 if (size > 0)
2843 c += size;
2844 } else {
2845 offset = 0;
2846 if (size > c)
2847 c = size;
2848 }
2849 if (align > maxalign)
2850 maxalign = align;
2851 }
2852 #if 0
2853 printf("add field %s offset=%d",
2854 get_tok_str(v, NULL), offset);
2855 if (type1.t & VT_BITFIELD) {
2856 printf(" pos=%d size=%d",
2857 (type1.t >> VT_STRUCT_SHIFT) & 0x3f,
2858 (type1.t >> (VT_STRUCT_SHIFT + 6)) & 0x3f);
2859 }
2860 printf("\n");
2861 #endif
2862 }
2863 if (v == 0 && (type1.t & VT_BTYPE) == VT_STRUCT) {
2864 ass = type1.ref;
2865 while ((ass = ass->next) != NULL) {
2866 ss = sym_push(ass->v, &ass->type, 0, offset + ass->c);
2867 *ps = ss;
2868 ps = &ss->next;
2869 }
2870 } else if (v) {
2871 ss = sym_push(v | SYM_FIELD, &type1, 0, offset);
2872 *ps = ss;
2873 ps = &ss->next;
2874 }
2875 if (tok == ';' || tok == TOK_EOF)
2876 break;
2877 skip(',');
2878 }
2879 skip(';');
2880 }
2881 skip('}');
2882 /* store size and alignment */
2883 s->c = (c + maxalign - 1) & -maxalign;
2884 s->r = maxalign;
2885 }
2886 }
2887 }
2888
2889 /* return 0 if no type declaration. otherwise, return the basic type
2890 and skip it.
2891 */
2892 static int parse_btype(CType *type, AttributeDef *ad)
2893 {
2894 int t, u, type_found, typespec_found, typedef_found;
2895 Sym *s;
2896 CType type1;
2897
2898 memset(ad, 0, sizeof(AttributeDef));
2899 type_found = 0;
2900 typespec_found = 0;
2901 typedef_found = 0;
2902 t = 0;
2903 while(1) {
2904 switch(tok) {
2905 case TOK_EXTENSION:
2906 /* currently, we really ignore extension */
2907 next();
2908 continue;
2909
2910 /* basic types */
2911 case TOK_CHAR:
2912 u = VT_BYTE;
2913 basic_type:
2914 next();
2915 basic_type1:
2916 if ((t & VT_BTYPE) != 0)
2917 tcc_error("too many basic types");
2918 t |= u;
2919 typespec_found = 1;
2920 break;
2921 case TOK_VOID:
2922 u = VT_VOID;
2923 goto basic_type;
2924 case TOK_SHORT:
2925 u = VT_SHORT;
2926 goto basic_type;
2927 case TOK_INT:
2928 next();
2929 typespec_found = 1;
2930 break;
2931 case TOK_LONG:
2932 next();
2933 if ((t & VT_BTYPE) == VT_DOUBLE) {
2934 #ifndef TCC_TARGET_PE
2935 t = (t & ~VT_BTYPE) | VT_LDOUBLE;
2936 #endif
2937 } else if ((t & VT_BTYPE) == VT_LONG) {
2938 t = (t & ~VT_BTYPE) | VT_LLONG;
2939 } else {
2940 u = VT_LONG;
2941 goto basic_type1;
2942 }
2943 break;
2944 case TOK_BOOL:
2945 u = VT_BOOL;
2946 goto basic_type;
2947 case TOK_FLOAT:
2948 u = VT_FLOAT;
2949 goto basic_type;
2950 case TOK_DOUBLE:
2951 next();
2952 if ((t & VT_BTYPE) == VT_LONG) {
2953 #ifdef TCC_TARGET_PE
2954 t = (t & ~VT_BTYPE) | VT_DOUBLE;
2955 #else
2956 t = (t & ~VT_BTYPE) | VT_LDOUBLE;
2957 #endif
2958 } else {
2959 u = VT_DOUBLE;
2960 goto basic_type1;
2961 }
2962 break;
2963 case TOK_ENUM:
2964 struct_decl(&type1, VT_ENUM);
2965 basic_type2:
2966 u = type1.t;
2967 type->ref = type1.ref;
2968 goto basic_type1;
2969 case TOK_STRUCT:
2970 case TOK_UNION:
2971 struct_decl(&type1, VT_STRUCT);
2972 goto basic_type2;
2973
2974 /* type modifiers */
2975 case TOK_CONST1:
2976 case TOK_CONST2:
2977 case TOK_CONST3:
2978 t |= VT_CONSTANT;
2979 next();
2980 break;
2981 case TOK_VOLATILE1:
2982 case TOK_VOLATILE2:
2983 case TOK_VOLATILE3:
2984 t |= VT_VOLATILE;
2985 next();
2986 break;
2987 case TOK_SIGNED1:
2988 case TOK_SIGNED2:
2989 case TOK_SIGNED3:
2990 typespec_found = 1;
2991 t |= VT_SIGNED;
2992 next();
2993 break;
2994 case TOK_REGISTER:
2995 case TOK_AUTO:
2996 case TOK_RESTRICT1:
2997 case TOK_RESTRICT2:
2998 case TOK_RESTRICT3:
2999 next();
3000 break;
3001 case TOK_UNSIGNED:
3002 t |= VT_UNSIGNED;
3003 next();
3004 typespec_found = 1;
3005 break;
3006
3007 /* storage */
3008 case TOK_EXTERN:
3009 t |= VT_EXTERN;
3010 next();
3011 break;
3012 case TOK_STATIC:
3013 t |= VT_STATIC;
3014 next();
3015 break;
3016 case TOK_TYPEDEF:
3017 t |= VT_TYPEDEF;
3018 next();
3019 break;
3020 case TOK_INLINE1:
3021 case TOK_INLINE2:
3022 case TOK_INLINE3:
3023 t |= VT_INLINE;
3024 next();
3025 break;
3026
3027 /* GNUC attribute */
3028 case TOK_ATTRIBUTE1:
3029 case TOK_ATTRIBUTE2:
3030 parse_attribute(ad);
3031 if (ad->mode) {
3032 u = ad->mode -1;
3033 t = (t & ~VT_BTYPE) | u;
3034 }
3035 break;
3036 /* GNUC typeof */
3037 case TOK_TYPEOF1:
3038 case TOK_TYPEOF2:
3039 case TOK_TYPEOF3:
3040 next();
3041 parse_expr_type(&type1);
3042 /* remove all storage modifiers except typedef */
3043 type1.t &= ~(VT_STORAGE&~VT_TYPEDEF);
3044 goto basic_type2;
3045 default:
3046 if (typespec_found || typedef_found)
3047 goto the_end;
3048 s = sym_find(tok);
3049 if (!s || !(s->type.t & VT_TYPEDEF))
3050 goto the_end;
3051 typedef_found = 1;
3052 t |= (s->type.t & ~VT_TYPEDEF);
3053 type->ref = s->type.ref;
3054 if (s->r) {
3055 /* get attributes from typedef */
3056 if (0 == ad->aligned)
3057 ad->aligned = FUNC_ALIGN(s->r);
3058 if (0 == ad->func_call)
3059 ad->func_call = FUNC_CALL(s->r);
3060 ad->packed |= FUNC_PACKED(s->r);
3061 }
3062 next();
3063 typespec_found = 1;
3064 break;
3065 }
3066 type_found = 1;
3067 }
3068 the_end:
3069 if ((t & (VT_SIGNED|VT_UNSIGNED)) == (VT_SIGNED|VT_UNSIGNED))
3070 tcc_error("signed and unsigned modifier");
3071 if (tcc_state->char_is_unsigned) {
3072 if ((t & (VT_SIGNED|VT_UNSIGNED|VT_BTYPE)) == VT_BYTE)
3073 t |= VT_UNSIGNED;
3074 }
3075 t &= ~VT_SIGNED;
3076
3077 /* long is never used as type */
3078 if ((t & VT_BTYPE) == VT_LONG)
3079 #if !defined TCC_TARGET_X86_64 || defined TCC_TARGET_PE
3080 t = (t & ~VT_BTYPE) | VT_INT;
3081 #else
3082 t = (t & ~VT_BTYPE) | VT_LLONG;
3083 #endif
3084 type->t = t;
3085 return type_found;
3086 }
3087
3088 /* convert a function parameter type (array to pointer and function to
3089 function pointer) */
3090 static inline void convert_parameter_type(CType *pt)
3091 {
3092 /* remove const and volatile qualifiers (XXX: const could be used
3093 to indicate a const function parameter */
3094 pt->t &= ~(VT_CONSTANT | VT_VOLATILE);
3095 /* array must be transformed to pointer according to ANSI C */
3096 pt->t &= ~VT_ARRAY;
3097 if ((pt->t & VT_BTYPE) == VT_FUNC) {
3098 mk_pointer(pt);
3099 }
3100 }
3101
3102 ST_FUNC void parse_asm_str(CString *astr)
3103 {
3104 skip('(');
3105 /* read the string */
3106 if (tok != TOK_STR)
3107 expect("string constant");
3108 cstr_new(astr);
3109 while (tok == TOK_STR) {
3110 /* XXX: add \0 handling too ? */
3111 cstr_cat(astr, tokc.cstr->data);
3112 next();
3113 }
3114 cstr_ccat(astr, '\0');
3115 }
3116
3117 /* Parse an asm label and return the label
3118 * Don't forget to free the CString in the caller! */
3119 static void asm_label_instr(CString *astr)
3120 {
3121 next();
3122 parse_asm_str(astr);
3123 skip(')');
3124 #ifdef ASM_DEBUG
3125 printf("asm_alias: \"%s\"\n", (char *)astr->data);
3126 #endif
3127 }
3128
3129 static void post_type(CType *type, AttributeDef *ad)
3130 {
3131 int n, l, t1, arg_size, align;
3132 Sym **plast, *s, *first;
3133 AttributeDef ad1;
3134 CType pt;
3135
3136 if (tok == '(') {
3137 /* function declaration */
3138 next();
3139 l = 0;
3140 first = NULL;
3141 plast = &first;
3142 arg_size = 0;
3143 if (tok != ')') {
3144 for(;;) {
3145 /* read param name and compute offset */
3146 if (l != FUNC_OLD) {
3147 if (!parse_btype(&pt, &ad1)) {
3148 if (l) {
3149 tcc_error("invalid type");
3150 } else {
3151 l = FUNC_OLD;
3152 goto old_proto;
3153 }
3154 }
3155 l = FUNC_NEW;
3156 if ((pt.t & VT_BTYPE) == VT_VOID && tok == ')')
3157 break;
3158 type_decl(&pt, &ad1, &n, TYPE_DIRECT | TYPE_ABSTRACT);
3159 if ((pt.t & VT_BTYPE) == VT_VOID)
3160 tcc_error("parameter declared as void");
3161 arg_size += (type_size(&pt, &align) + PTR_SIZE - 1) / PTR_SIZE;
3162 } else {
3163 old_proto:
3164 n = tok;
3165 if (n < TOK_UIDENT)
3166 expect("identifier");
3167 pt.t = VT_INT;
3168 next();
3169 }
3170 convert_parameter_type(&pt);
3171 s = sym_push(n | SYM_FIELD, &pt, 0, 0);
3172 *plast = s;
3173 plast = &s->next;
3174 if (tok == ')')
3175 break;
3176 skip(',');
3177 if (l == FUNC_NEW && tok == TOK_DOTS) {
3178 l = FUNC_ELLIPSIS;
3179 next();
3180 break;
3181 }
3182 }
3183 }
3184 /* if no parameters, then old type prototype */
3185 if (l == 0)
3186 l = FUNC_OLD;
3187 skip(')');
3188 /* NOTE: const is ignored in returned type as it has a special
3189 meaning in gcc / C++ */
3190 type->t &= ~VT_CONSTANT;
3191 /* some ancient pre-K&R C allows a function to return an array
3192 and the array brackets to be put after the arguments, such
3193 that "int c()[]" means something like "int[] c()" */
3194 if (tok == '[') {
3195 next();
3196 skip(']'); /* only handle simple "[]" */
3197 type->t |= VT_PTR;
3198 }
3199 /* we push a anonymous symbol which will contain the function prototype */
3200 ad->func_args = arg_size;
3201 s = sym_push(SYM_FIELD, type, INT_ATTR(ad), l);
3202 s->next = first;
3203 type->t = VT_FUNC;
3204 type->ref = s;
3205 } else if (tok == '[') {
3206 /* array definition */
3207 next();
3208 if (tok == TOK_RESTRICT1)
3209 next();
3210 n = -1;
3211 t1 = 0;
3212 if (tok != ']') {
3213 if (!local_stack || nocode_wanted)
3214 vpushi(expr_const());
3215 else gexpr();
3216 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
3217 n = vtop->c.i;
3218 if (n < 0)
3219 tcc_error("invalid array size");
3220 } else {
3221 if (!is_integer_btype(vtop->type.t & VT_BTYPE))
3222 tcc_error("size of variable length array should be an integer");
3223 t1 = VT_VLA;
3224 }
3225 }
3226 skip(']');
3227 /* parse next post type */
3228 post_type(type, ad);
3229 t1 |= type->t & VT_VLA;
3230
3231 if (t1 & VT_VLA) {
3232 loc -= type_size(&int_type, &align);
3233 loc &= -align;
3234 n = loc;
3235
3236 vla_runtime_type_size(type, &align);
3237 gen_op('*');
3238 vset(&int_type, VT_LOCAL|VT_LVAL, loc);
3239 vswap();
3240 vstore();
3241 }
3242 if (n != -1)
3243 vpop();
3244
3245 /* we push an anonymous symbol which will contain the array
3246 element type */
3247 s = sym_push(SYM_FIELD, type, 0, n);
3248 type->t = (t1 ? VT_VLA : VT_ARRAY) | VT_PTR;
3249 type->ref = s;
3250 }
3251 }
3252
3253 /* Parse a type declaration (except basic type), and return the type
3254 in 'type'. 'td' is a bitmask indicating which kind of type decl is
3255 expected. 'type' should contain the basic type. 'ad' is the
3256 attribute definition of the basic type. It can be modified by
3257 type_decl().
3258 */
3259 static void type_decl(CType *type, AttributeDef *ad, int *v, int td)
3260 {
3261 Sym *s;
3262 CType type1, *type2;
3263 int qualifiers, storage, saved_nocode_wanted;
3264
3265 while (tok == '*') {
3266 qualifiers = 0;
3267 redo:
3268 next();
3269 switch(tok) {
3270 case TOK_CONST1:
3271 case TOK_CONST2:
3272 case TOK_CONST3:
3273 qualifiers |= VT_CONSTANT;
3274 goto redo;
3275 case TOK_VOLATILE1:
3276 case TOK_VOLATILE2:
3277 case TOK_VOLATILE3:
3278 qualifiers |= VT_VOLATILE;
3279 goto redo;
3280 case TOK_RESTRICT1:
3281 case TOK_RESTRICT2:
3282 case TOK_RESTRICT3:
3283 goto redo;
3284 }
3285 mk_pointer(type);
3286 type->t |= qualifiers;
3287 }
3288
3289 /* XXX: clarify attribute handling */
3290 if (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2)
3291 parse_attribute(ad);
3292
3293 /* recursive type */
3294 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
3295 type1.t = 0; /* XXX: same as int */
3296 if (tok == '(') {
3297 next();
3298 /* XXX: this is not correct to modify 'ad' at this point, but
3299 the syntax is not clear */
3300 if (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2)
3301 parse_attribute(ad);
3302 type_decl(&type1, ad, v, td);
3303 skip(')');
3304 } else {
3305 /* type identifier */
3306 if (tok >= TOK_IDENT && (td & TYPE_DIRECT)) {
3307 *v = tok;
3308 next();
3309 } else {
3310 if (!(td & TYPE_ABSTRACT))
3311 expect("identifier");
3312 *v = 0;
3313 }
3314 }
3315 storage = type->t & VT_STORAGE;
3316 type->t &= ~VT_STORAGE;
3317 if (storage & VT_STATIC) {
3318 saved_nocode_wanted = nocode_wanted;
3319 nocode_wanted = 1;
3320 }
3321 post_type(type, ad);
3322 if (storage & VT_STATIC)
3323 nocode_wanted = saved_nocode_wanted;
3324 type->t |= storage;
3325 if (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2)
3326 parse_attribute(ad);
3327
3328 if (!type1.t)
3329 return;
3330 /* append type at the end of type1 */
3331 type2 = &type1;
3332 for(;;) {
3333 s = type2->ref;
3334 type2 = &s->type;
3335 if (!type2->t) {
3336 *type2 = *type;
3337 break;
3338 }
3339 }
3340 *type = type1;
3341 }
3342
3343 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
3344 ST_FUNC int lvalue_type(int t)
3345 {
3346 int bt, r;
3347 r = VT_LVAL;
3348 bt = t & VT_BTYPE;
3349 if (bt == VT_BYTE || bt == VT_BOOL)
3350 r |= VT_LVAL_BYTE;
3351 else if (bt == VT_SHORT)
3352 r |= VT_LVAL_SHORT;
3353 else
3354 return r;
3355 if (t & VT_UNSIGNED)
3356 r |= VT_LVAL_UNSIGNED;
3357 return r;
3358 }
3359
3360 /* indirection with full error checking and bound check */
3361 ST_FUNC void indir(void)
3362 {
3363 if ((vtop->type.t & VT_BTYPE) != VT_PTR) {
3364 if ((vtop->type.t & VT_BTYPE) == VT_FUNC)
3365 return;
3366 expect("pointer");
3367 }
3368 if ((vtop->r & VT_LVAL) && !nocode_wanted)
3369 gv(RC_INT);
3370 vtop->type = *pointed_type(&vtop->type);
3371 /* Arrays and functions are never lvalues */
3372 if (!(vtop->type.t & VT_ARRAY) && !(vtop->type.t & VT_VLA)
3373 && (vtop->type.t & VT_BTYPE) != VT_FUNC) {
3374 vtop->r |= lvalue_type(vtop->type.t);
3375 /* if bound checking, the referenced pointer must be checked */
3376 #ifdef CONFIG_TCC_BCHECK
3377 if (tcc_state->do_bounds_check)
3378 vtop->r |= VT_MUSTBOUND;
3379 #endif
3380 }
3381 }
3382
3383 /* pass a parameter to a function and do type checking and casting */
3384 static void gfunc_param_typed(Sym *func, Sym *arg)
3385 {
3386 int func_type;
3387 CType type;
3388
3389 func_type = func->c;
3390 if (func_type == FUNC_OLD ||
3391 (func_type == FUNC_ELLIPSIS && arg == NULL)) {
3392 /* default casting : only need to convert float to double */
3393 if ((vtop->type.t & VT_BTYPE) == VT_FLOAT) {
3394 type.t = VT_DOUBLE;
3395 gen_cast(&type);
3396 }
3397 } else if (arg == NULL) {
3398 tcc_error("too many arguments to function");
3399 } else {
3400 type = arg->type;
3401 type.t &= ~VT_CONSTANT; /* need to do that to avoid false warning */
3402 gen_assign_cast(&type);
3403 }
3404 }
3405
3406 /* parse an expression of the form '(type)' or '(expr)' and return its
3407 type */
3408 static void parse_expr_type(CType *type)
3409 {
3410 int n;
3411 AttributeDef ad;
3412
3413 skip('(');
3414 if (parse_btype(type, &ad)) {
3415 type_decl(type, &ad, &n, TYPE_ABSTRACT);
3416 } else {
3417 expr_type(type);
3418 }
3419 skip(')');
3420 }
3421
3422 static void parse_type(CType *type)
3423 {
3424 AttributeDef ad;
3425 int n;
3426
3427 if (!parse_btype(type, &ad)) {
3428 expect("type");
3429 }
3430 type_decl(type, &ad, &n, TYPE_ABSTRACT);
3431 }
3432
3433 static void vpush_tokc(int t)
3434 {
3435 CType type;
3436 type.t = t;
3437 type.ref = 0;
3438 vsetc(&type, VT_CONST, &tokc);
3439 }
3440
3441 ST_FUNC void unary(void)
3442 {
3443 int n, t, align, size, r, sizeof_caller;
3444 CType type;
3445 Sym *s;
3446 AttributeDef ad;
3447 static int in_sizeof = 0;
3448
3449 sizeof_caller = in_sizeof;
3450 in_sizeof = 0;
3451 /* XXX: GCC 2.95.3 does not generate a table although it should be
3452 better here */
3453 tok_next:
3454 switch(tok) {
3455 case TOK_EXTENSION:
3456 next();
3457 goto tok_next;
3458 case TOK_CINT:
3459 case TOK_CCHAR:
3460 case TOK_LCHAR:
3461 vpushi(tokc.i);
3462 next();
3463 break;
3464 case TOK_CUINT:
3465 vpush_tokc(VT_INT | VT_UNSIGNED);
3466 next();
3467 break;
3468 case TOK_CLLONG:
3469 vpush_tokc(VT_LLONG);
3470 next();
3471 break;
3472 case TOK_CULLONG:
3473 vpush_tokc(VT_LLONG | VT_UNSIGNED);
3474 next();
3475 break;
3476 case TOK_CFLOAT:
3477 vpush_tokc(VT_FLOAT);
3478 next();
3479 break;
3480 case TOK_CDOUBLE:
3481 vpush_tokc(VT_DOUBLE);
3482 next();
3483 break;
3484 case TOK_CLDOUBLE:
3485 vpush_tokc(VT_LDOUBLE);
3486 next();
3487 break;
3488 case TOK___FUNCTION__:
3489 if (!gnu_ext)
3490 goto tok_identifier;
3491 /* fall thru */
3492 case TOK___FUNC__:
3493 {
3494 void *ptr;
3495 int len;
3496 /* special function name identifier */
3497 len = strlen(funcname) + 1;
3498 /* generate char[len] type */
3499 type.t = VT_BYTE;
3500 mk_pointer(&type);
3501 type.t |= VT_ARRAY;
3502 type.ref->c = len;
3503 vpush_ref(&type, data_section, data_section->data_offset, len);
3504 ptr = section_ptr_add(data_section, len);
3505 memcpy(ptr, funcname, len);
3506 next();
3507 }
3508 break;
3509 case TOK_LSTR:
3510 #ifdef TCC_TARGET_PE
3511 t = VT_SHORT | VT_UNSIGNED;
3512 #else
3513 t = VT_INT;
3514 #endif
3515 goto str_init;
3516 case TOK_STR:
3517 /* string parsing */
3518 t = VT_BYTE;
3519 str_init:
3520 if (tcc_state->warn_write_strings)
3521 t |= VT_CONSTANT;
3522 type.t = t;
3523 mk_pointer(&type);
3524 type.t |= VT_ARRAY;
3525 memset(&ad, 0, sizeof(AttributeDef));
3526 decl_initializer_alloc(&type, &ad, VT_CONST, 2, 0, NULL, 0);
3527 break;
3528 case '(':
3529 next();
3530 /* cast ? */
3531 if (parse_btype(&type, &ad)) {
3532 type_decl(&type, &ad, &n, TYPE_ABSTRACT);
3533 skip(')');
3534 /* check ISOC99 compound literal */
3535 if (tok == '{') {
3536 /* data is allocated locally by default */
3537 if (global_expr)
3538 r = VT_CONST;
3539 else
3540 r = VT_LOCAL;
3541 /* all except arrays are lvalues */
3542 if (!(type.t & VT_ARRAY))
3543 r |= lvalue_type(type.t);
3544 memset(&ad, 0, sizeof(AttributeDef));
3545 decl_initializer_alloc(&type, &ad, r, 1, 0, NULL, 0);
3546 } else {
3547 if (sizeof_caller) {
3548 vpush(&type);
3549 return;
3550 }
3551 unary();
3552 gen_cast(&type);
3553 }
3554 } else if (tok == '{') {
3555 /* save all registers */
3556 save_regs(0);
3557 /* statement expression : we do not accept break/continue
3558 inside as GCC does */
3559 block(NULL, NULL, NULL, NULL, 0, 1);
3560 skip(')');
3561 } else {
3562 gexpr();
3563 skip(')');
3564 }
3565 break;
3566 case '*':
3567 next();
3568 unary();
3569 indir();
3570 break;
3571 case '&':
3572 next();
3573 unary();
3574 /* functions names must be treated as function pointers,
3575 except for unary '&' and sizeof. Since we consider that
3576 functions are not lvalues, we only have to handle it
3577 there and in function calls. */
3578 /* arrays can also be used although they are not lvalues */
3579 if ((vtop->type.t & VT_BTYPE) != VT_FUNC &&
3580 !(vtop->type.t & VT_ARRAY) && !(vtop->type.t & VT_LLOCAL))
3581 test_lvalue();
3582 mk_pointer(&vtop->type);
3583 gaddrof();
3584 break;
3585 case '!':
3586 next();
3587 unary();
3588 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
3589 CType boolean;
3590 boolean.t = VT_BOOL;
3591 gen_cast(&boolean);
3592 vtop->c.i = !vtop->c.i;
3593 } else if ((vtop->r & VT_VALMASK) == VT_CMP)
3594 vtop->c.i = vtop->c.i ^ 1;
3595 else {
3596 save_regs(1);
3597 vseti(VT_JMP, gtst(1, 0));
3598 }
3599 break;
3600 case '~':
3601 next();
3602 unary();
3603 vpushi(-1);
3604 gen_op('^');
3605 break;
3606 case '+':
3607 next();
3608 /* in order to force cast, we add zero */
3609 unary();
3610 if ((vtop->type.t & VT_BTYPE) == VT_PTR)
3611 tcc_error("pointer not accepted for unary plus");
3612 vpushi(0);
3613 gen_op('+');
3614 break;
3615 case TOK_SIZEOF:
3616 case TOK_ALIGNOF1:
3617 case TOK_ALIGNOF2:
3618 t = tok;
3619 next();
3620 in_sizeof++;
3621 unary_type(&type); // Perform a in_sizeof = 0;
3622 size = type_size(&type, &align);
3623 if (t == TOK_SIZEOF) {
3624 if (!(type.t & VT_VLA)) {
3625 if (size < 0)
3626 tcc_error("sizeof applied to an incomplete type");
3627 vpushs(size);
3628 } else {
3629 vla_runtime_type_size(&type, &align);
3630 }
3631 } else {
3632 vpushs(align);
3633 }
3634 vtop->type.t |= VT_UNSIGNED;
3635 break;
3636
3637 case TOK_builtin_types_compatible_p:
3638 {
3639 CType type1, type2;
3640 next();
3641 skip('(');
3642 parse_type(&type1);
3643 skip(',');
3644 parse_type(&type2);
3645 skip(')');
3646 type1.t &= ~(VT_CONSTANT | VT_VOLATILE);
3647 type2.t &= ~(VT_CONSTANT | VT_VOLATILE);
3648 vpushi(is_compatible_types(&type1, &type2));
3649 }
3650 break;
3651 case TOK_builtin_constant_p:
3652 {
3653 int saved_nocode_wanted, res;
3654 next();
3655 skip('(');
3656 saved_nocode_wanted = nocode_wanted;
3657 nocode_wanted = 1;
3658 gexpr();
3659 res = (vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
3660 vpop();
3661 nocode_wanted = saved_nocode_wanted;
3662 skip(')');
3663 vpushi(res);
3664 }
3665 break;
3666 case TOK_builtin_frame_address:
3667 {
3668 CType type;
3669 next();
3670 skip('(');
3671 if (tok != TOK_CINT) {
3672 tcc_error("__builtin_frame_address only takes integers");
3673 }
3674 if (tokc.i != 0) {
3675 tcc_error("TCC only supports __builtin_frame_address(0)");
3676 }
3677 next();
3678 skip(')');
3679 type.t = VT_VOID;
3680 mk_pointer(&type);
3681 vset(&type, VT_LOCAL, 0);
3682 }
3683 break;
3684 #ifdef TCC_TARGET_X86_64
3685 case TOK_builtin_va_arg_types:
3686 {
3687 /* This definition must be synced with stdarg.h */
3688 enum __va_arg_type {
3689 __va_gen_reg, __va_float_reg, __va_stack
3690 };
3691 CType type;
3692 int bt;
3693 next();
3694 skip('(');
3695 parse_type(&type);
3696 skip(')');
3697 bt = type.t & VT_BTYPE;
3698 if (bt == VT_STRUCT || bt == VT_LDOUBLE) {
3699 vpushi(__va_stack);
3700 } else if (bt == VT_FLOAT || bt == VT_DOUBLE) {
3701 vpushi(__va_float_reg);
3702 } else {
3703 vpushi(__va_gen_reg);
3704 }
3705 }
3706 break;
3707 #endif
3708 case TOK_INC:
3709 case TOK_DEC:
3710 t = tok;
3711 next();
3712 unary();
3713 inc(0, t);
3714 break;
3715 case '-':
3716 next();
3717 vpushi(0);
3718 unary();
3719 gen_op('-');
3720 break;
3721 case TOK_LAND:
3722 if (!gnu_ext)
3723 goto tok_identifier;
3724 next();
3725 /* allow to take the address of a label */
3726 if (tok < TOK_UIDENT)
3727 expect("label identifier");
3728 s = label_find(tok);
3729 if (!s) {
3730 s = label_push(&global_label_stack, tok, LABEL_FORWARD);
3731 } else {
3732 if (s->r == LABEL_DECLARED)
3733 s->r = LABEL_FORWARD;
3734 }
3735 if (!s->type.t) {
3736 s->type.t = VT_VOID;
3737 mk_pointer(&s->type);
3738 s->type.t |= VT_STATIC;
3739 }
3740 vset(&s->type, VT_CONST | VT_SYM, 0);
3741 vtop->sym = s;
3742 next();
3743 break;
3744
3745 // special qnan , snan and infinity values
3746 case TOK___NAN__:
3747 vpush64(VT_DOUBLE, 0x7ff8000000000000ULL);
3748 next();
3749 break;
3750 case TOK___SNAN__:
3751 vpush64(VT_DOUBLE, 0x7ff0000000000001ULL);
3752 next();
3753 break;
3754 case TOK___INF__:
3755 vpush64(VT_DOUBLE, 0x7ff0000000000000ULL);
3756 next();
3757 break;
3758
3759 default:
3760 tok_identifier:
3761 t = tok;
3762 next();
3763 if (t < TOK_UIDENT)
3764 expect("identifier");
3765 s = sym_find(t);
3766 if (!s) {
3767 if (tok != '(')
3768 tcc_error("'%s' undeclared", get_tok_str(t, NULL));
3769 /* for simple function calls, we tolerate undeclared
3770 external reference to int() function */
3771 if (tcc_state->warn_implicit_function_declaration)
3772 tcc_warning("implicit declaration of function '%s'",
3773 get_tok_str(t, NULL));
3774 s = external_global_sym(t, &func_old_type, 0);
3775 }
3776 if ((s->type.t & (VT_STATIC | VT_INLINE | VT_BTYPE)) ==
3777 (VT_STATIC | VT_INLINE | VT_FUNC)) {
3778 /* if referencing an inline function, then we generate a
3779 symbol to it if not already done. It will have the
3780 effect to generate code for it at the end of the
3781 compilation unit. Inline function as always
3782 generated in the text section. */
3783 if (!s->c)
3784 put_extern_sym(s, text_section, 0, 0);
3785 r = VT_SYM | VT_CONST;
3786 } else {
3787 r = s->r;
3788 }
3789 vset(&s->type, r, s->c);
3790 /* if forward reference, we must point to s */
3791 if (vtop->r & VT_SYM) {
3792 vtop->sym = s;
3793 vtop->c.ul = 0;
3794 }
3795 break;
3796 }
3797
3798 /* post operations */
3799 while (1) {
3800 if (tok == TOK_INC || tok == TOK_DEC) {
3801 inc(1, tok);
3802 next();
3803 } else if (tok == '.' || tok == TOK_ARROW) {
3804 int qualifiers;
3805 /* field */
3806 if (tok == TOK_ARROW)
3807 indir();
3808 qualifiers = vtop->type.t & (VT_CONSTANT | VT_VOLATILE);
3809 test_lvalue();
3810 gaddrof();
3811 next();
3812 /* expect pointer on structure */
3813 if ((vtop->type.t & VT_BTYPE) != VT_STRUCT)
3814 expect("struct or union");
3815 s = vtop->type.ref;
3816 /* find field */
3817 tok |= SYM_FIELD;
3818 while ((s = s->next) != NULL) {
3819 if (s->v == tok)
3820 break;
3821 }
3822 if (!s)
3823 tcc_error("field not found: %s", get_tok_str(tok & ~SYM_FIELD, NULL));
3824 /* add field offset to pointer */
3825 vtop->type = char_pointer_type; /* change type to 'char *' */
3826 vpushi(s->c);
3827 gen_op('+');
3828 /* change type to field type, and set to lvalue */
3829 vtop->type = s->type;
3830 vtop->type.t |= qualifiers;
3831 /* an array is never an lvalue */
3832 if (!(vtop->type.t & VT_ARRAY)) {
3833 vtop->r |= lvalue_type(vtop->type.t);
3834 #ifdef CONFIG_TCC_BCHECK
3835 /* if bound checking, the referenced pointer must be checked */
3836 if (tcc_state->do_bounds_check)
3837 vtop->r |= VT_MUSTBOUND;
3838 #endif
3839 }
3840 next();
3841 } else if (tok == '[') {
3842 next();
3843 gexpr();
3844 gen_op('+');
3845 indir();
3846 skip(']');
3847 } else if (tok == '(') {
3848 SValue ret;
3849 Sym *sa;
3850 int nb_args;
3851
3852 /* function call */
3853 if ((vtop->type.t & VT_BTYPE) != VT_FUNC) {
3854 /* pointer test (no array accepted) */
3855 if ((vtop->type.t & (VT_BTYPE | VT_ARRAY)) == VT_PTR) {
3856 vtop->type = *pointed_type(&vtop->type);
3857 if ((vtop->type.t & VT_BTYPE) != VT_FUNC)
3858 goto error_func;
3859 } else {
3860 error_func:
3861 expect("function pointer");
3862 }
3863 } else {
3864 vtop->r &= ~VT_LVAL; /* no lvalue */
3865 }
3866 /* get return type */
3867 s = vtop->type.ref;
3868 next();
3869 sa = s->next; /* first parameter */
3870 nb_args = 0;
3871 ret.r2 = VT_CONST;
3872 /* compute first implicit argument if a structure is returned */
3873 if ((s->type.t & VT_BTYPE) == VT_STRUCT) {
3874 /* get some space for the returned structure */
3875 size = type_size(&s->type, &align);
3876 loc = (loc - size) & -align;
3877 ret.type = s->type;
3878 ret.r = VT_LOCAL | VT_LVAL;
3879 /* pass it as 'int' to avoid structure arg passing
3880 problems */
3881 vseti(VT_LOCAL, loc);
3882 ret.c = vtop->c;
3883 nb_args++;
3884 } else {
3885 ret.type = s->type;
3886 /* return in register */
3887 if (is_float(ret.type.t)) {
3888 ret.r = reg_fret(ret.type.t);
3889 } else {
3890 if ((ret.type.t & VT_BTYPE) == VT_LLONG)
3891 ret.r2 = REG_LRET;
3892 ret.r = REG_IRET;
3893 }
3894 ret.c.i = 0;
3895 }
3896 if (tok != ')') {
3897 for(;;) {
3898 expr_eq();
3899 gfunc_param_typed(s, sa);
3900 nb_args++;
3901 if (sa)
3902 sa = sa->next;
3903 if (tok == ')')
3904 break;
3905 skip(',');
3906 }
3907 }
3908 if (sa)
3909 tcc_error("too few arguments to function");
3910 skip(')');
3911 if (!nocode_wanted) {
3912 gfunc_call(nb_args);
3913 } else {
3914 vtop -= (nb_args + 1);
3915 }
3916 /* return value */
3917 vsetc(&ret.type, ret.r, &ret.c);
3918 vtop->r2 = ret.r2;
3919 } else {
3920 break;
3921 }
3922 }
3923 }
3924
3925 ST_FUNC void expr_prod(void)
3926 {
3927 int t;
3928
3929 unary();
3930 while (tok == '*' || tok == '/' || tok == '%') {
3931 t = tok;
3932 next();
3933 unary();
3934 gen_op(t);
3935 }
3936 }
3937
3938 ST_FUNC void expr_sum(void)
3939 {
3940 int t;
3941
3942 expr_prod();
3943 while (tok == '+' || tok == '-') {
3944 t = tok;
3945 next();
3946 expr_prod();
3947 gen_op(t);
3948 }
3949 }
3950
3951 static void expr_shift(void)
3952 {
3953 int t;
3954
3955 expr_sum();
3956 while (tok == TOK_SHL || tok == TOK_SAR) {
3957 t = tok;
3958 next();
3959 expr_sum();
3960 gen_op(t);
3961 }
3962 }
3963
3964 static void expr_cmp(void)
3965 {
3966 int t;
3967
3968 expr_shift();
3969 while ((tok >= TOK_ULE && tok <= TOK_GT) ||
3970 tok == TOK_ULT || tok == TOK_UGE) {
3971 t = tok;
3972 next();
3973 expr_shift();
3974 gen_op(t);
3975 }
3976 }
3977
3978 static void expr_cmpeq(void)
3979 {
3980 int t;
3981
3982 expr_cmp();
3983 while (tok == TOK_EQ || tok == TOK_NE) {
3984 t = tok;
3985 next();
3986 expr_cmp();
3987 gen_op(t);
3988 }
3989 }
3990
3991 static void expr_and(void)
3992 {
3993 expr_cmpeq();
3994 while (tok == '&') {
3995 next();
3996 expr_cmpeq();
3997 gen_op('&');
3998 }
3999 }
4000
4001 static void expr_xor(void)
4002 {
4003 expr_and();
4004 while (tok == '^') {
4005 next();
4006 expr_and();
4007 gen_op('^');
4008 }
4009 }
4010
4011 static void expr_or(void)
4012 {
4013 expr_xor();
4014 while (tok == '|') {
4015 next();
4016 expr_xor();
4017 gen_op('|');
4018 }
4019 }
4020
4021 /* XXX: fix this mess */
4022 static void expr_land_const(void)
4023 {
4024 expr_or();
4025 while (tok == TOK_LAND) {
4026 next();
4027 expr_or();
4028 gen_op(TOK_LAND);
4029 }
4030 }
4031
4032 /* XXX: fix this mess */
4033 static void expr_lor_const(void)
4034 {
4035 expr_land_const();
4036 while (tok == TOK_LOR) {
4037 next();
4038 expr_land_const();
4039 gen_op(TOK_LOR);
4040 }
4041 }
4042
4043 /* only used if non constant */
4044 static void expr_land(void)
4045 {
4046 int t;
4047
4048 expr_or();
4049 if (tok == TOK_LAND) {
4050 t = 0;
4051 save_regs(1);
4052 for(;;) {
4053 t = gtst(1, t);
4054 if (tok != TOK_LAND) {
4055 vseti(VT_JMPI, t);
4056 break;
4057 }
4058 next();
4059 expr_or();
4060 }
4061 }
4062 }
4063
4064 static void expr_lor(void)
4065 {
4066 int t;
4067
4068 expr_land();
4069 if (tok == TOK_LOR) {
4070 t = 0;
4071 save_regs(1);
4072 for(;;) {
4073 t = gtst(0, t);
4074 if (tok != TOK_LOR) {
4075 vseti(VT_JMP, t);
4076 break;
4077 }
4078 next();
4079 expr_land();
4080 }
4081 }
4082 }
4083
4084 /* XXX: better constant handling */
4085 static void expr_cond(void)
4086 {
4087 int tt, u, r1, r2, rc, t1, t2, bt1, bt2;
4088 SValue sv;
4089 CType type, type1, type2;
4090
4091 if (const_wanted) {
4092 expr_lor_const();
4093 if (tok == '?') {
4094 CType boolean;
4095 int c;
4096 boolean.t = VT_BOOL;
4097 vdup();
4098 gen_cast(&boolean);
4099 c = vtop->c.i;
4100 vpop();
4101 next();
4102 if (tok != ':' || !gnu_ext) {
4103 vpop();
4104 gexpr();
4105 }
4106 if (!c)
4107 vpop();
4108 skip(':');
4109 expr_cond();
4110 if (c)
4111 vpop();
4112 }
4113 } else {
4114 expr_lor();
4115 if (tok == '?') {
4116 next();
4117 if (vtop != vstack) {
4118 /* needed to avoid having different registers saved in
4119 each branch */
4120 if (is_float(vtop->type.t)) {
4121 rc = RC_FLOAT;
4122 #ifdef TCC_TARGET_X86_64
4123 if ((vtop->type.t & VT_BTYPE) == VT_LDOUBLE) {
4124 rc = RC_ST0;
4125 }
4126 #endif
4127 }
4128 else
4129 rc = RC_INT;
4130 gv(rc);
4131 save_regs(1);
4132 }
4133 if (tok == ':' && gnu_ext) {
4134 gv_dup();
4135 tt = gtst(1, 0);
4136 } else {
4137 tt = gtst(1, 0);
4138 gexpr();
4139 }
4140 type1 = vtop->type;
4141 sv = *vtop; /* save value to handle it later */
4142 vtop--; /* no vpop so that FP stack is not flushed */
4143 skip(':');
4144 u = gjmp(0);
4145 gsym(tt);
4146 expr_cond();
4147 type2 = vtop->type;
4148
4149 t1 = type1.t;
4150 bt1 = t1 & VT_BTYPE;
4151 t2 = type2.t;
4152 bt2 = t2 & VT_BTYPE;
4153 /* cast operands to correct type according to ISOC rules */
4154 if (is_float(bt1) || is_float(bt2)) {
4155 if (bt1 == VT_LDOUBLE || bt2 == VT_LDOUBLE) {
4156 type.t = VT_LDOUBLE;
4157 } else if (bt1 == VT_DOUBLE || bt2 == VT_DOUBLE) {
4158 type.t = VT_DOUBLE;
4159 } else {
4160 type.t = VT_FLOAT;
4161 }
4162 } else if (bt1 == VT_LLONG || bt2 == VT_LLONG) {
4163 /* cast to biggest op */
4164 type.t = VT_LLONG;
4165 /* convert to unsigned if it does not fit in a long long */
4166 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED) ||
4167 (t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED))
4168 type.t |= VT_UNSIGNED;
4169 } else if (bt1 == VT_PTR || bt2 == VT_PTR) {
4170 /* If one is a null ptr constant the result type
4171 is the other. */
4172 if (is_null_pointer (vtop))
4173 type = type1;
4174 else if (is_null_pointer (&sv))
4175 type = type2;
4176 /* XXX: test pointer compatibility, C99 has more elaborate
4177 rules here. */
4178 else
4179 type = type1;
4180 } else if (bt1 == VT_FUNC || bt2 == VT_FUNC) {
4181 /* XXX: test function pointer compatibility */
4182 type = bt1 == VT_FUNC ? type1 : type2;
4183 } else if (bt1 == VT_STRUCT || bt2 == VT_STRUCT) {
4184 /* XXX: test structure compatibility */
4185 type = bt1 == VT_STRUCT ? type1 : type2;
4186 } else if (bt1 == VT_VOID || bt2 == VT_VOID) {
4187 /* NOTE: as an extension, we accept void on only one side */
4188 type.t = VT_VOID;
4189 } else {
4190 /* integer operations */
4191 type.t = VT_INT;
4192 /* convert to unsigned if it does not fit in an integer */
4193 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED) ||
4194 (t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED))
4195 type.t |= VT_UNSIGNED;
4196 }
4197
4198 /* now we convert second operand */
4199 gen_cast(&type);
4200 if (VT_STRUCT == (vtop->type.t & VT_BTYPE))
4201 gaddrof();
4202 rc = RC_INT;
4203 if (is_float(type.t)) {
4204 rc = RC_FLOAT;
4205 #ifdef TCC_TARGET_X86_64
4206 if ((type.t & VT_BTYPE) == VT_LDOUBLE) {
4207 rc = RC_ST0;
4208 }
4209 #endif
4210 } else if ((type.t & VT_BTYPE) == VT_LLONG) {
4211 /* for long longs, we use fixed registers to avoid having
4212 to handle a complicated move */
4213 rc = RC_IRET;
4214 }
4215
4216 r2 = gv(rc);
4217 /* this is horrible, but we must also convert first
4218 operand */
4219 tt = gjmp(0);
4220 gsym(u);
4221 /* put again first value and cast it */
4222 *vtop = sv;
4223 gen_cast(&type);
4224 if (VT_STRUCT == (vtop->type.t & VT_BTYPE))
4225 gaddrof();
4226 r1 = gv(rc);
4227 move_reg(r2, r1);
4228 vtop->r = r2;
4229 gsym(tt);
4230 }
4231 }
4232 }
4233
4234 static void expr_eq(void)
4235 {
4236 int t;
4237
4238 expr_cond();
4239 if (tok == '=' ||
4240 (tok >= TOK_A_MOD && tok <= TOK_A_DIV) ||
4241 tok == TOK_A_XOR || tok == TOK_A_OR ||
4242 tok == TOK_A_SHL || tok == TOK_A_SAR) {
4243 test_lvalue();
4244 t = tok;
4245 next();
4246 if (t == '=') {
4247 expr_eq();
4248 } else {
4249 vdup();
4250 expr_eq();
4251 gen_op(t & 0x7f);
4252 }
4253 vstore();
4254 }
4255 }
4256
4257 ST_FUNC void gexpr(void)
4258 {
4259 while (1) {
4260 expr_eq();
4261 if (tok != ',')
4262 break;
4263 vpop();
4264 next();
4265 }
4266 }
4267
4268 /* parse an expression and return its type without any side effect. */
4269 static void expr_type(CType *type)
4270 {
4271 int saved_nocode_wanted;
4272
4273 saved_nocode_wanted = nocode_wanted;
4274 nocode_wanted = 1;
4275 gexpr();
4276 *type = vtop->type;
4277 vpop();
4278 nocode_wanted = saved_nocode_wanted;
4279 }
4280
4281 /* parse a unary expression and return its type without any side
4282 effect. */
4283 static void unary_type(CType *type)
4284 {
4285 int a;
4286
4287 a = nocode_wanted;
4288 nocode_wanted = 1;
4289 unary();
4290 *type = vtop->type;
4291 vpop();
4292 nocode_wanted = a;
4293 }
4294
4295 /* parse a constant expression and return value in vtop. */
4296 static void expr_const1(void)
4297 {
4298 int a;
4299 a = const_wanted;
4300 const_wanted = 1;
4301 expr_cond();
4302 const_wanted = a;
4303 }
4304
4305 /* parse an integer constant and return its value. */
4306 ST_FUNC int expr_const(void)
4307 {
4308 int c;
4309 expr_const1();
4310 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) != VT_CONST)
4311 expect("constant expression");
4312 c = vtop->c.i;
4313 vpop();
4314 return c;
4315 }
4316
4317 /* return the label token if current token is a label, otherwise
4318 return zero */
4319 static int is_label(void)
4320 {
4321 int last_tok;
4322
4323 /* fast test first */
4324 if (tok < TOK_UIDENT)
4325 return 0;
4326 /* no need to save tokc because tok is an identifier */
4327 last_tok = tok;
4328 next();
4329 if (tok == ':') {
4330 next();
4331 return last_tok;
4332 } else {
4333 unget_tok(last_tok);
4334 return 0;
4335 }
4336 }
4337
4338 static void label_or_decl(int l)
4339 {
4340 int last_tok;
4341
4342 /* fast test first */
4343 if (tok >= TOK_UIDENT)
4344 {
4345 /* no need to save tokc because tok is an identifier */
4346 last_tok = tok;
4347 next();
4348 if (tok == ':') {
4349 unget_tok(last_tok);
4350 return;
4351 }
4352 unget_tok(last_tok);
4353 }
4354 decl(l);
4355 }
4356
4357 static void block(int *bsym, int *csym, int *case_sym, int *def_sym,
4358 int case_reg, int is_expr)
4359 {
4360 int a, b, c, d;
4361 Sym *s, *frame_bottom;
4362
4363 /* generate line number info */
4364 if (tcc_state->do_debug &&
4365 (last_line_num != file->line_num || last_ind != ind)) {
4366 put_stabn(N_SLINE, 0, file->line_num, ind - func_ind);
4367 last_ind = ind;
4368 last_line_num = file->line_num;
4369 }
4370
4371 if (is_expr) {
4372 /* default return value is (void) */
4373 vpushi(0);
4374 vtop->type.t = VT_VOID;
4375 }
4376
4377 if (tok == TOK_IF) {
4378 /* if test */
4379 next();
4380 skip('(');
4381 gexpr();
4382 skip(')');
4383 a = gtst(1, 0);
4384 block(bsym, csym, case_sym, def_sym, case_reg, 0);
4385 c = tok;
4386 if (c == TOK_ELSE) {
4387 next();
4388 d = gjmp(0);
4389 gsym(a);
4390 block(bsym, csym, case_sym, def_sym, case_reg, 0);
4391 gsym(d); /* patch else jmp */
4392 } else
4393 gsym(a);
4394 } else if (tok == TOK_WHILE) {
4395 next();
4396 d = ind;
4397 skip('(');
4398 gexpr();
4399 skip(')');
4400 a = gtst(1, 0);
4401 b = 0;
4402 block(&a, &b, case_sym, def_sym, case_reg, 0);
4403 gjmp_addr(d);
4404 gsym(a);
4405 gsym_addr(b, d);
4406 } else if (tok == '{') {
4407 Sym *llabel;
4408
4409 next();
4410 /* record local declaration stack position */
4411 s = local_stack;
4412 frame_bottom = sym_push2(&local_stack, SYM_FIELD, 0, 0);
4413 frame_bottom->next = scope_stack_bottom;
4414 scope_stack_bottom = frame_bottom;
4415 llabel = local_label_stack;
4416 /* handle local labels declarations */
4417 if (tok == TOK_LABEL) {
4418 next();
4419 for(;;) {
4420 if (tok < TOK_UIDENT)
4421 expect("label identifier");
4422 label_push(&local_label_stack, tok, LABEL_DECLARED);
4423 next();
4424 if (tok == ',') {
4425 next();
4426 } else {
4427 skip(';');
4428 break;
4429 }
4430 }
4431 }
4432 while (tok != '}') {
4433 label_or_decl(VT_LOCAL);
4434 if (tok != '}') {
4435 if (is_expr)
4436 vpop();
4437 block(bsym, csym, case_sym, def_sym, case_reg, is_expr);
4438 }
4439 }
4440 /* pop locally defined labels */
4441 label_pop(&local_label_stack, llabel);
4442 if(is_expr) {
4443 /* XXX: this solution makes only valgrind happy...
4444 triggered by gcc.c-torture/execute/20000917-1.c */
4445 Sym *p;
4446 switch(vtop->type.t & VT_BTYPE) {
4447 case VT_PTR:
4448 case VT_STRUCT:
4449 case VT_ENUM:
4450 case VT_FUNC:
4451 for(p=vtop->type.ref;p;p=p->prev)
4452 if(p->prev==s)
4453 tcc_error("unsupported expression type");
4454 }
4455 }
4456 /* pop locally defined symbols */
4457 scope_stack_bottom = scope_stack_bottom->next;
4458 sym_pop(&local_stack, s);
4459 next();
4460 } else if (tok == TOK_RETURN) {
4461 next();
4462 if (tok != ';') {
4463 gexpr();
4464 gen_assign_cast(&func_vt);
4465 if ((func_vt.t & VT_BTYPE) == VT_STRUCT) {
4466 CType type;
4467 /* if returning structure, must copy it to implicit
4468 first pointer arg location */
4469 #ifdef TCC_ARM_EABI
4470 int align, size;
4471 size = type_size(&func_vt,&align);
4472 if(size <= 4)
4473 {
4474 if((vtop->r != (VT_LOCAL | VT_LVAL) || (vtop->c.i & 3))
4475 && (align & 3))
4476 {
4477 int addr;
4478 loc = (loc - size) & -4;
4479 addr = loc;
4480 type = func_vt;
4481 vset(&type, VT_LOCAL | VT_LVAL, addr);
4482 vswap();
4483 vstore();
4484 vset(&int_type, VT_LOCAL | VT_LVAL, addr);
4485 }
4486 vtop->type = int_type;
4487 gv(RC_IRET);
4488 } else {
4489 #endif
4490 type = func_vt;
4491 mk_pointer(&type);
4492 vset(&type, VT_LOCAL | VT_LVAL, func_vc);
4493 indir();
4494 vswap();
4495 /* copy structure value to pointer */
4496 vstore();
4497 #ifdef TCC_ARM_EABI
4498 }
4499 #endif
4500 } else if (is_float(func_vt.t)) {
4501 gv(rc_fret(func_vt.t));
4502 } else {
4503 gv(RC_IRET);
4504 }
4505 vtop--; /* NOT vpop() because on x86 it would flush the fp stack */
4506 }
4507 skip(';');
4508 rsym = gjmp(rsym); /* jmp */
4509 } else if (tok == TOK_BREAK) {
4510 /* compute jump */
4511 if (!bsym)
4512 tcc_error("cannot break");
4513 *bsym = gjmp(*bsym);
4514 next();
4515 skip(';');
4516 } else if (tok == TOK_CONTINUE) {
4517 /* compute jump */
4518 if (!csym)
4519 tcc_error("cannot continue");
4520 *csym = gjmp(*csym);
4521 next();
4522 skip(';');
4523 } else if (tok == TOK_FOR) {
4524 int e;
4525 next();
4526 skip('(');
4527 s = local_stack;
4528 frame_bottom = sym_push2(&local_stack, SYM_FIELD, 0, 0);
4529 frame_bottom->next = scope_stack_bottom;
4530 scope_stack_bottom = frame_bottom;
4531 if (tok != ';') {
4532 /* c99 for-loop init decl? */
4533 if (!decl0(VT_LOCAL, 1)) {
4534 /* no, regular for-loop init expr */
4535 gexpr();
4536 vpop();
4537 }
4538 }
4539 skip(';');
4540 d = ind;
4541 c = ind;
4542 a = 0;
4543 b = 0;
4544 if (tok != ';') {
4545 gexpr();
4546 a = gtst(1, 0);
4547 }
4548 skip(';');
4549 if (tok != ')') {
4550 e = gjmp(0);
4551 c = ind;
4552 gexpr();
4553 vpop();
4554 gjmp_addr(d);
4555 gsym(e);
4556 }
4557 skip(')');
4558 block(&a, &b, case_sym, def_sym, case_reg, 0);
4559 gjmp_addr(c);
4560 gsym(a);
4561 gsym_addr(b, c);
4562 scope_stack_bottom = scope_stack_bottom->next;
4563 sym_pop(&local_stack, s);
4564 } else
4565 if (tok == TOK_DO) {
4566 next();
4567 a = 0;
4568 b = 0;
4569 d = ind;
4570 block(&a, &b, case_sym, def_sym, case_reg, 0);
4571 skip(TOK_WHILE);
4572 skip('(');
4573 gsym(b);
4574 gexpr();
4575 c = gtst(0, 0);
4576 gsym_addr(c, d);
4577 skip(')');
4578 gsym(a);
4579 skip(';');
4580 } else
4581 if (tok == TOK_SWITCH) {
4582 next();
4583 skip('(');
4584 gexpr();
4585 /* XXX: other types than integer */
4586 case_reg = gv(RC_INT);
4587 vpop();
4588 skip(')');
4589 a = 0;
4590 b = gjmp(0); /* jump to first case */
4591 c = 0;
4592 block(&a, csym, &b, &c, case_reg, 0);
4593 /* if no default, jmp after switch */
4594 if (c == 0)
4595 c = ind;
4596 /* default label */
4597 gsym_addr(b, c);
4598 /* break label */
4599 gsym(a);
4600 } else
4601 if (tok == TOK_CASE) {
4602 int v1, v2;
4603 if (!case_sym)
4604 expect("switch");
4605 next();
4606 v1 = expr_const();
4607 v2 = v1;
4608 if (gnu_ext && tok == TOK_DOTS) {
4609 next();
4610 v2 = expr_const();
4611 if (v2 < v1)
4612 tcc_warning("empty case range");
4613 }
4614 /* since a case is like a label, we must skip it with a jmp */
4615 b = gjmp(0);
4616 gsym(*case_sym);
4617 vseti(case_reg, 0);
4618 vpushi(v1);
4619 if (v1 == v2) {
4620 gen_op(TOK_EQ);
4621 *case_sym = gtst(1, 0);
4622 } else {
4623 gen_op(TOK_GE);
4624 *case_sym = gtst(1, 0);
4625 vseti(case_reg, 0);
4626 vpushi(v2);
4627 gen_op(TOK_LE);
4628 *case_sym = gtst(1, *case_sym);
4629 }
4630 gsym(b);
4631 skip(':');
4632 is_expr = 0;
4633 goto block_after_label;
4634 } else
4635 if (tok == TOK_DEFAULT) {
4636 next();
4637 skip(':');
4638 if (!def_sym)
4639 expect("switch");
4640 if (*def_sym)
4641 tcc_error("too many 'default'");
4642 *def_sym = ind;
4643 is_expr = 0;
4644 goto block_after_label;
4645 } else
4646 if (tok == TOK_GOTO) {
4647 next();
4648 if (tok == '*' && gnu_ext) {
4649 /* computed goto */
4650 next();
4651 gexpr();
4652 if ((vtop->type.t & VT_BTYPE) != VT_PTR)
4653 expect("pointer");
4654 ggoto();
4655 } else if (tok >= TOK_UIDENT) {
4656 s = label_find(tok);
4657 /* put forward definition if needed */
4658 if (!s) {
4659 s = label_push(&global_label_stack, tok, LABEL_FORWARD);
4660 } else {
4661 if (s->r == LABEL_DECLARED)
4662 s->r = LABEL_FORWARD;
4663 }
4664 /* label already defined */
4665 if (s->r & LABEL_FORWARD)
4666 s->jnext = gjmp(s->jnext);
4667 else
4668 gjmp_addr(s->jnext);
4669 next();
4670 } else {
4671 expect("label identifier");
4672 }
4673 skip(';');
4674 } else if (tok == TOK_ASM1 || tok == TOK_ASM2 || tok == TOK_ASM3) {
4675 asm_instr();
4676 } else {
4677 b = is_label();
4678 if (b) {
4679 /* label case */
4680 s = label_find(b);
4681 if (s) {
4682 if (s->r == LABEL_DEFINED)
4683 tcc_error("duplicate label '%s'", get_tok_str(s->v, NULL));
4684 gsym(s->jnext);
4685 s->r = LABEL_DEFINED;
4686 } else {
4687 s = label_push(&global_label_stack, b, LABEL_DEFINED);
4688 }
4689 s->jnext = ind;
4690 /* we accept this, but it is a mistake */
4691 block_after_label:
4692 if (tok == '}') {
4693 tcc_warning("deprecated use of label at end of compound statement");
4694 } else {
4695 if (is_expr)
4696 vpop();
4697 block(bsym, csym, case_sym, def_sym, case_reg, is_expr);
4698 }
4699 } else {
4700 /* expression case */
4701 if (tok != ';') {
4702 if (is_expr) {
4703 vpop();
4704 gexpr();
4705 } else {
4706 gexpr();
4707 vpop();
4708 }
4709 }
4710 skip(';');
4711 }
4712 }
4713 }
4714
4715 /* t is the array or struct type. c is the array or struct
4716 address. cur_index/cur_field is the pointer to the current
4717 value. 'size_only' is true if only size info is needed (only used
4718 in arrays) */
4719 static void decl_designator(CType *type, Section *sec, unsigned long c,
4720 int *cur_index, Sym **cur_field,
4721 int size_only)
4722 {
4723 Sym *s, *f;
4724 int notfirst, index, index_last, align, l, nb_elems, elem_size;
4725 CType type1;
4726
4727 notfirst = 0;
4728 elem_size = 0;
4729 nb_elems = 1;
4730 if (gnu_ext && (l = is_label()) != 0)
4731 goto struct_field;
4732 while (tok == '[' || tok == '.') {
4733 if (tok == '[') {
4734 if (!(type->t & VT_ARRAY))
4735 expect("array type");
4736 s = type->ref;
4737 next();
4738 index = expr_const();
4739 if (index < 0 || (s->c >= 0 && index >= s->c))
4740 expect("invalid index");
4741 if (tok == TOK_DOTS && gnu_ext) {
4742 next();
4743 index_last = expr_const();
4744 if (index_last < 0 ||
4745 (s->c >= 0 && index_last >= s->c) ||
4746 index_last < index)
4747 expect("invalid index");
4748 } else {
4749 index_last = index;
4750 }
4751 skip(']');
4752 if (!notfirst)
4753 *cur_index = index_last;
4754 type = pointed_type(type);
4755 elem_size = type_size(type, &align);
4756 c += index * elem_size;
4757 /* NOTE: we only support ranges for last designator */
4758 nb_elems = index_last - index + 1;
4759 if (nb_elems != 1) {
4760 notfirst = 1;
4761 break;
4762 }
4763 } else {
4764 next();
4765 l = tok;
4766 next();
4767 struct_field:
4768 if ((type->t & VT_BTYPE) != VT_STRUCT)
4769 expect("struct/union type");
4770 s = type->ref;
4771 l |= SYM_FIELD;
4772 f = s->next;
4773 while (f) {
4774 if (f->v == l)
4775 break;
4776 f = f->next;
4777 }
4778 if (!f)
4779 expect("field");
4780 if (!notfirst)
4781 *cur_field = f;
4782 /* XXX: fix this mess by using explicit storage field */
4783 type1 = f->type;
4784 type1.t |= (type->t & ~VT_TYPE);
4785 type = &type1;
4786 c += f->c;
4787 }
4788 notfirst = 1;
4789 }
4790 if (notfirst) {
4791 if (tok == '=') {
4792 next();
4793 } else {
4794 if (!gnu_ext)
4795 expect("=");
4796 }
4797 } else {
4798 if (type->t & VT_ARRAY) {
4799 index = *cur_index;
4800 type = pointed_type(type);
4801 c += index * type_size(type, &align);
4802 } else {
4803 f = *cur_field;
4804 if (!f)
4805 tcc_error("too many field init");
4806 /* XXX: fix this mess by using explicit storage field */
4807 type1 = f->type;
4808 type1.t |= (type->t & ~VT_TYPE);
4809 type = &type1;
4810 c += f->c;
4811 }
4812 }
4813 decl_initializer(type, sec, c, 0, size_only);
4814
4815 /* XXX: make it more general */
4816 if (!size_only && nb_elems > 1) {
4817 unsigned long c_end;
4818 uint8_t *src, *dst;
4819 int i;
4820
4821 if (!sec)
4822 tcc_error("range init not supported yet for dynamic storage");
4823 c_end = c + nb_elems * elem_size;
4824 if (c_end > sec->data_allocated)
4825 section_realloc(sec, c_end);
4826 src = sec->data + c;
4827 dst = src;
4828 for(i = 1; i < nb_elems; i++) {
4829 dst += elem_size;
4830 memcpy(dst, src, elem_size);
4831 }
4832 }
4833 }
4834
4835 #define EXPR_VAL 0
4836 #define EXPR_CONST 1
4837 #define EXPR_ANY 2
4838
4839 /* store a value or an expression directly in global data or in local array */
4840 static void init_putv(CType *type, Section *sec, unsigned long c,
4841 int v, int expr_type)
4842 {
4843 int saved_global_expr, bt, bit_pos, bit_size;
4844 void *ptr;
4845 unsigned long long bit_mask;
4846 CType dtype;
4847
4848 switch(expr_type) {
4849 case EXPR_VAL:
4850 vpushi(v);
4851 break;
4852 case EXPR_CONST:
4853 /* compound literals must be allocated globally in this case */
4854 saved_global_expr = global_expr;
4855 global_expr = 1;
4856 expr_const1();
4857 global_expr = saved_global_expr;
4858 /* NOTE: symbols are accepted */
4859 if ((vtop->r & (VT_VALMASK | VT_LVAL)) != VT_CONST)
4860 tcc_error("initializer element is not constant");
4861 break;
4862 case EXPR_ANY:
4863 expr_eq();
4864 break;
4865 }
4866
4867 dtype = *type;
4868 dtype.t &= ~VT_CONSTANT; /* need to do that to avoid false warning */
4869
4870 if (sec) {
4871 /* XXX: not portable */
4872 /* XXX: generate error if incorrect relocation */
4873 gen_assign_cast(&dtype);
4874 bt = type->t & VT_BTYPE;
4875 /* we'll write at most 12 bytes */
4876 if (c + 12 > sec->data_allocated) {
4877 section_realloc(sec, c + 12);
4878 }
4879 ptr = sec->data + c;
4880 /* XXX: make code faster ? */
4881 if (!(type->t & VT_BITFIELD)) {
4882 bit_pos = 0;
4883 bit_size = 32;
4884 bit_mask = -1LL;
4885 } else {
4886 bit_pos = (vtop->type.t >> VT_STRUCT_SHIFT) & 0x3f;
4887 bit_size = (vtop->type.t >> (VT_STRUCT_SHIFT + 6)) & 0x3f;
4888 bit_mask = (1LL << bit_size) - 1;
4889 }
4890 if ((vtop->r & VT_SYM) &&
4891 (bt == VT_BYTE ||
4892 bt == VT_SHORT ||
4893 bt == VT_DOUBLE ||
4894 bt == VT_LDOUBLE ||
4895 bt == VT_LLONG ||
4896 (bt == VT_INT && bit_size != 32)))
4897 tcc_error("initializer element is not computable at load time");
4898 switch(bt) {
4899 case VT_BOOL:
4900 vtop->c.i = (vtop->c.i != 0);
4901 case VT_BYTE:
4902 *(char *)ptr |= (vtop->c.i & bit_mask) << bit_pos;
4903 break;
4904 case VT_SHORT:
4905 *(short *)ptr |= (vtop->c.i & bit_mask) << bit_pos;
4906 break;
4907 case VT_DOUBLE:
4908 *(double *)ptr = vtop->c.d;
4909 break;
4910 case VT_LDOUBLE:
4911 *(long double *)ptr = vtop->c.ld;
4912 break;
4913 case VT_LLONG:
4914 *(long long *)ptr |= (vtop->c.ll & bit_mask) << bit_pos;
4915 break;
4916 default:
4917 if (vtop->r & VT_SYM) {
4918 greloc(sec, vtop->sym, c, R_DATA_PTR);
4919 }
4920 *(int *)ptr |= (vtop->c.i & bit_mask) << bit_pos;
4921 break;
4922 }
4923 vtop--;
4924 } else {
4925 vset(&dtype, VT_LOCAL|VT_LVAL, c);
4926 vswap();
4927 vstore();
4928 vpop();
4929 }
4930 }
4931
4932 /* put zeros for variable based init */
4933 static void init_putz(CType *t, Section *sec, unsigned long c, int size)
4934 {
4935 if (sec) {
4936 /* nothing to do because globals are already set to zero */
4937 } else {
4938 vpush_global_sym(&func_old_type, TOK_memset);
4939 vseti(VT_LOCAL, c);
4940 vpushi(0);
4941 vpushi(size);
4942 gfunc_call(3);
4943 }
4944 }
4945
4946 /* 't' contains the type and storage info. 'c' is the offset of the
4947 object in section 'sec'. If 'sec' is NULL, it means stack based
4948 allocation. 'first' is true if array '{' must be read (multi
4949 dimension implicit array init handling). 'size_only' is true if
4950 size only evaluation is wanted (only for arrays). */
4951 static void decl_initializer(CType *type, Section *sec, unsigned long c,
4952 int first, int size_only)
4953 {
4954 int index, array_length, n, no_oblock, nb, parlevel, parlevel1, i;
4955 int size1, align1, expr_type;
4956 Sym *s, *f;
4957 CType *t1;
4958
4959 if (type->t & VT_VLA) {
4960 #if defined TCC_TARGET_I386 || defined TCC_TARGET_X86_64
4961 int a;
4962 CValue retcval;
4963
4964 vpush_global_sym(&func_old_type, TOK_alloca);
4965 vla_runtime_type_size(type, &a);
4966 gfunc_call(1);
4967
4968 /* return value */
4969 retcval.i = 0;
4970 vsetc(type, REG_IRET, &retcval);
4971 vset(type, VT_LOCAL|VT_LVAL, c);
4972 vswap();
4973 vstore();
4974 vpop();
4975 #else
4976 tcc_error("variable length arrays unsupported for this target");
4977 #endif
4978 } else if (type->t & VT_ARRAY) {
4979 s = type->ref;
4980 n = s->c;
4981 array_length = 0;
4982 t1 = pointed_type(type);
4983 size1 = type_size(t1, &align1);
4984
4985 no_oblock = 1;
4986 if ((first && tok != TOK_LSTR && tok != TOK_STR) ||
4987 tok == '{') {
4988 if (tok != '{')
4989 tcc_error("character array initializer must be a literal,"
4990 " optionally enclosed in braces");
4991 skip('{');
4992 no_oblock = 0;
4993 }
4994
4995 /* only parse strings here if correct type (otherwise: handle
4996 them as ((w)char *) expressions */
4997 if ((tok == TOK_LSTR &&
4998 #ifdef TCC_TARGET_PE
4999 (t1->t & VT_BTYPE) == VT_SHORT && (t1->t & VT_UNSIGNED)
5000 #else
5001 (t1->t & VT_BTYPE) == VT_INT
5002 #endif
5003 ) || (tok == TOK_STR && (t1->t & VT_BTYPE) == VT_BYTE)) {
5004 while (tok == TOK_STR || tok == TOK_LSTR) {
5005 int cstr_len, ch;
5006 CString *cstr;
5007
5008 cstr = tokc.cstr;
5009 /* compute maximum number of chars wanted */
5010 if (tok == TOK_STR)
5011 cstr_len = cstr->size;
5012 else
5013 cstr_len = cstr->size / sizeof(nwchar_t);
5014 cstr_len--;
5015 nb = cstr_len;
5016 if (n >= 0 && nb > (n - array_length))
5017 nb = n - array_length;
5018 if (!size_only) {
5019 if (cstr_len > nb)
5020 tcc_warning("initializer-string for array is too long");
5021 /* in order to go faster for common case (char
5022 string in global variable, we handle it
5023 specifically */
5024 if (sec && tok == TOK_STR && size1 == 1) {
5025 memcpy(sec->data + c + array_length, cstr->data, nb);
5026 } else {
5027 for(i=0;i<nb;i++) {
5028 if (tok == TOK_STR)
5029 ch = ((unsigned char *)cstr->data)[i];
5030 else
5031 ch = ((nwchar_t *)cstr->data)[i];
5032 init_putv(t1, sec, c + (array_length + i) * size1,
5033 ch, EXPR_VAL);
5034 }
5035 }
5036 }
5037 array_length += nb;
5038 next();
5039 }
5040 /* only add trailing zero if enough storage (no
5041 warning in this case since it is standard) */
5042 if (n < 0 || array_length < n) {
5043 if (!size_only) {
5044 init_putv(t1, sec, c + (array_length * size1), 0, EXPR_VAL);
5045 }
5046 array_length++;
5047 }
5048 } else {
5049 index = 0;
5050 while (tok != '}') {
5051 decl_designator(type, sec, c, &index, NULL, size_only);
5052 if (n >= 0 && index >= n)
5053 tcc_error("index too large");
5054 /* must put zero in holes (note that doing it that way
5055 ensures that it even works with designators) */
5056 if (!size_only && array_length < index) {
5057 init_putz(t1, sec, c + array_length * size1,
5058 (index - array_length) * size1);
5059 }
5060 index++;
5061 if (index > array_length)
5062 array_length = index;
5063 /* special test for multi dimensional arrays (may not
5064 be strictly correct if designators are used at the
5065 same time) */
5066 if (index >= n && no_oblock)
5067 break;
5068 if (tok == '}')
5069 break;
5070 skip(',');
5071 }
5072 }
5073 if (!no_oblock)
5074 skip('}');
5075 /* put zeros at the end */
5076 if (!size_only && n >= 0 && array_length < n) {
5077 init_putz(t1, sec, c + array_length * size1,
5078 (n - array_length) * size1);
5079 }
5080 /* patch type size if needed */
5081 if (n < 0)
5082 s->c = array_length;
5083 } else if ((type->t & VT_BTYPE) == VT_STRUCT &&
5084 (sec || !first || tok == '{')) {
5085 int par_count;
5086
5087 /* NOTE: the previous test is a specific case for automatic
5088 struct/union init */
5089 /* XXX: union needs only one init */
5090
5091 /* XXX: this test is incorrect for local initializers
5092 beginning with ( without {. It would be much more difficult
5093 to do it correctly (ideally, the expression parser should
5094 be used in all cases) */
5095 par_count = 0;
5096 if (tok == '(') {
5097 AttributeDef ad1;
5098 CType type1;
5099 next();
5100 while (tok == '(') {
5101 par_count++;
5102 next();
5103 }
5104 if (!parse_btype(&type1, &ad1))
5105 expect("cast");
5106 type_decl(&type1, &ad1, &n, TYPE_ABSTRACT);
5107 #if 0
5108 if (!is_assignable_types(type, &type1))
5109 tcc_error("invalid type for cast");
5110 #endif
5111 skip(')');
5112 }
5113 no_oblock = 1;
5114 if (first || tok == '{') {
5115 skip('{');
5116 no_oblock = 0;
5117 }
5118 s = type->ref;
5119 f = s->next;
5120 array_length = 0;
5121 index = 0;
5122 n = s->c;
5123 while (tok != '}') {
5124 decl_designator(type, sec, c, NULL, &f, size_only);
5125 index = f->c;
5126 if (!size_only && array_length < index) {
5127 init_putz(type, sec, c + array_length,
5128 index - array_length);
5129 }
5130 index = index + type_size(&f->type, &align1);
5131 if (index > array_length)
5132 array_length = index;
5133
5134 /* gr: skip fields from same union - ugly. */
5135 while (f->next) {
5136 ///printf("index: %2d %08x -- %2d %08x\n", f->c, f->type.t, f->next->c, f->next->type.t);
5137 /* test for same offset */
5138 if (f->next->c != f->c)
5139 break;
5140 /* if yes, test for bitfield shift */
5141 if ((f->type.t & VT_BITFIELD) && (f->next->type.t & VT_BITFIELD)) {
5142 int bit_pos_1 = (f->type.t >> VT_STRUCT_SHIFT) & 0x3f;
5143 int bit_pos_2 = (f->next->type.t >> VT_STRUCT_SHIFT) & 0x3f;
5144 //printf("bitfield %d %d\n", bit_pos_1, bit_pos_2);
5145 if (bit_pos_1 != bit_pos_2)
5146 break;
5147 }
5148 f = f->next;
5149 }
5150
5151 f = f->next;
5152 if (no_oblock && f == NULL)
5153 break;
5154 if (tok == '}')
5155 break;
5156 skip(',');
5157 }
5158 /* put zeros at the end */
5159 if (!size_only && array_length < n) {
5160 init_putz(type, sec, c + array_length,
5161 n - array_length);
5162 }
5163 if (!no_oblock)
5164 skip('}');
5165 while (par_count) {
5166 skip(')');
5167 par_count--;
5168 }
5169 } else if (tok == '{') {
5170 next();
5171 decl_initializer(type, sec, c, first, size_only);
5172 skip('}');
5173 } else if (size_only) {
5174 /* just skip expression */
5175 parlevel = parlevel1 = 0;
5176 while ((parlevel > 0 || parlevel1 > 0 ||
5177 (tok != '}' && tok != ',')) && tok != -1) {
5178 if (tok == '(')
5179 parlevel++;
5180 else if (tok == ')')
5181 parlevel--;
5182 else if (tok == '{')
5183 parlevel1++;
5184 else if (tok == '}')
5185 parlevel1--;
5186 next();
5187 }
5188 } else {
5189 /* currently, we always use constant expression for globals
5190 (may change for scripting case) */
5191 expr_type = EXPR_CONST;
5192 if (!sec)
5193 expr_type = EXPR_ANY;
5194 init_putv(type, sec, c, 0, expr_type);
5195 }
5196 }
5197
5198 /* parse an initializer for type 't' if 'has_init' is non zero, and
5199 allocate space in local or global data space ('r' is either
5200 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
5201 variable 'v' with an associated name represented by 'asm_label' of
5202 scope 'scope' is declared before initializers are parsed. If 'v' is
5203 zero, then a reference to the new object is put in the value stack.
5204 If 'has_init' is 2, a special parsing is done to handle string
5205 constants. */
5206 static void decl_initializer_alloc(CType *type, AttributeDef *ad, int r,
5207 int has_init, int v, char *asm_label,
5208 int scope)
5209 {
5210 int size, align, addr, data_offset;
5211 int level;
5212 ParseState saved_parse_state = {0};
5213 TokenString init_str;
5214 Section *sec;
5215 Sym *flexible_array;
5216
5217 flexible_array = NULL;
5218 if ((type->t & VT_BTYPE) == VT_STRUCT) {
5219 Sym *field;
5220 field = type->ref;
5221 while (field && field->next)
5222 field = field->next;
5223 if (field->type.t & VT_ARRAY && field->type.ref->c < 0)
5224 flexible_array = field;
5225 }
5226
5227 size = type_size(type, &align);
5228 /* If unknown size, we must evaluate it before
5229 evaluating initializers because
5230 initializers can generate global data too
5231 (e.g. string pointers or ISOC99 compound
5232 literals). It also simplifies local
5233 initializers handling */
5234 tok_str_new(&init_str);
5235 if (size < 0 || (flexible_array && has_init)) {
5236 if (!has_init)
5237 tcc_error("unknown type size");
5238 /* get all init string */
5239 if (has_init == 2) {
5240 /* only get strings */
5241 while (tok == TOK_STR || tok == TOK_LSTR) {
5242 tok_str_add_tok(&init_str);
5243 next();
5244 }
5245 } else {
5246 level = 0;
5247 while (level > 0 || (tok != ',' && tok != ';')) {
5248 if (tok < 0)
5249 tcc_error("unexpected end of file in initializer");
5250 tok_str_add_tok(&init_str);
5251 if (tok == '{')
5252 level++;
5253 else if (tok == '}') {
5254 level--;
5255 if (level <= 0) {
5256 next();
5257 break;
5258 }
5259 }
5260 next();
5261 }
5262 }
5263 tok_str_add(&init_str, -1);
5264 tok_str_add(&init_str, 0);
5265
5266 /* compute size */
5267 save_parse_state(&saved_parse_state);
5268
5269 macro_ptr = init_str.str;
5270 next();
5271 decl_initializer(type, NULL, 0, 1, 1);
5272 /* prepare second initializer parsing */
5273 macro_ptr = init_str.str;
5274 next();
5275
5276 /* if still unknown size, error */
5277 size = type_size(type, &align);
5278 if (size < 0)
5279 tcc_error("unknown type size");
5280 }
5281 if (flexible_array)
5282 size += flexible_array->type.ref->c * pointed_size(&flexible_array->type);
5283 /* take into account specified alignment if bigger */
5284 if (ad->aligned) {
5285 if (ad->aligned > align)
5286 align = ad->aligned;
5287 } else if (ad->packed) {
5288 align = 1;
5289 }
5290 if ((r & VT_VALMASK) == VT_LOCAL) {
5291 sec = NULL;
5292 #ifdef CONFIG_TCC_BCHECK
5293 if (tcc_state->do_bounds_check && (type->t & VT_ARRAY)) {
5294 loc--;
5295 }
5296 #endif
5297 loc = (loc - size) & -align;
5298 addr = loc;
5299 #ifdef CONFIG_TCC_BCHECK
5300 /* handles bounds */
5301 /* XXX: currently, since we do only one pass, we cannot track
5302 '&' operators, so we add only arrays */
5303 if (tcc_state->do_bounds_check && (type->t & VT_ARRAY)) {
5304 unsigned long *bounds_ptr;
5305 /* add padding between regions */
5306 loc--;
5307 /* then add local bound info */
5308 bounds_ptr = section_ptr_add(lbounds_section, 2 * sizeof(unsigned long));
5309 bounds_ptr[0] = addr;
5310 bounds_ptr[1] = size;
5311 }
5312 #endif
5313 if (v) {
5314 /* local variable */
5315 sym_push(v, type, r, addr);
5316 } else {
5317 /* push local reference */
5318 vset(type, r, addr);
5319 }
5320 } else {
5321 Sym *sym;
5322
5323 sym = NULL;
5324 if (v && scope == VT_CONST) {
5325 /* see if the symbol was already defined */
5326 sym = sym_find(v);
5327 if (sym) {
5328 if (!is_compatible_types(&sym->type, type))
5329 tcc_error("incompatible types for redefinition of '%s'",
5330 get_tok_str(v, NULL));
5331 if (sym->type.t & VT_EXTERN) {
5332 /* if the variable is extern, it was not allocated */
5333 sym->type.t &= ~VT_EXTERN;
5334 /* set array size if it was ommited in extern
5335 declaration */
5336 if ((sym->type.t & VT_ARRAY) &&
5337 sym->type.ref->c < 0 &&
5338 type->ref->c >= 0)
5339 sym->type.ref->c = type->ref->c;
5340 } else {
5341 /* we accept several definitions of the same
5342 global variable. this is tricky, because we
5343 must play with the SHN_COMMON type of the symbol */
5344 /* XXX: should check if the variable was already
5345 initialized. It is incorrect to initialized it
5346 twice */
5347 /* no init data, we won't add more to the symbol */
5348 if (!has_init)
5349 goto no_alloc;
5350 }
5351 }
5352 }
5353
5354 /* allocate symbol in corresponding section */
5355 sec = ad->section;
5356 if (!sec) {
5357 if (has_init)
5358 sec = data_section;
5359 else if (tcc_state->nocommon)
5360 sec = bss_section;
5361 }
5362 if (sec) {
5363 data_offset = sec->data_offset;
5364 data_offset = (data_offset + align - 1) & -align;
5365 addr = data_offset;
5366 /* very important to increment global pointer at this time
5367 because initializers themselves can create new initializers */
5368 data_offset += size;
5369 #ifdef CONFIG_TCC_BCHECK
5370 /* add padding if bound check */
5371 if (tcc_state->do_bounds_check)
5372 data_offset++;
5373 #endif
5374 sec->data_offset = data_offset;
5375 /* allocate section space to put the data */
5376 if (sec->sh_type != SHT_NOBITS &&
5377 data_offset > sec->data_allocated)
5378 section_realloc(sec, data_offset);
5379 /* align section if needed */
5380 if (align > sec->sh_addralign)
5381 sec->sh_addralign = align;
5382 } else {
5383 addr = 0; /* avoid warning */
5384 }
5385
5386 if (v) {
5387 if (scope != VT_CONST || !sym) {
5388 sym = sym_push(v, type, r | VT_SYM, 0);
5389 sym->asm_label = asm_label;
5390 }
5391 /* update symbol definition */
5392 if (sec) {
5393 put_extern_sym(sym, sec, addr, size);
5394 } else {
5395 ElfW(Sym) *esym;
5396 /* put a common area */
5397 put_extern_sym(sym, NULL, align, size);
5398 /* XXX: find a nicer way */
5399 esym = &((ElfW(Sym) *)symtab_section->data)[sym->c];
5400 esym->st_shndx = SHN_COMMON;
5401 }
5402 } else {
5403 CValue cval;
5404
5405 /* push global reference */
5406 sym = get_sym_ref(type, sec, addr, size);
5407 cval.ul = 0;
5408 vsetc(type, VT_CONST | VT_SYM, &cval);
5409 vtop->sym = sym;
5410 }
5411 /* patch symbol weakness */
5412 if (type->t & VT_WEAK)
5413 weaken_symbol(sym);
5414 #ifdef CONFIG_TCC_BCHECK
5415 /* handles bounds now because the symbol must be defined
5416 before for the relocation */
5417 if (tcc_state->do_bounds_check) {
5418 unsigned long *bounds_ptr;
5419
5420 greloc(bounds_section, sym, bounds_section->data_offset, R_DATA_PTR);
5421 /* then add global bound info */
5422 bounds_ptr = section_ptr_add(bounds_section, 2 * sizeof(long));
5423 bounds_ptr[0] = 0; /* relocated */
5424 bounds_ptr[1] = size;
5425 }
5426 #endif
5427 }
5428 if (has_init || (type->t & VT_VLA)) {
5429 decl_initializer(type, sec, addr, 1, 0);
5430 /* restore parse state if needed */
5431 if (init_str.str) {
5432 tok_str_free(init_str.str);
5433 restore_parse_state(&saved_parse_state);
5434 }
5435 /* patch flexible array member size back to -1, */
5436 /* for possible subsequent similar declarations */
5437 if (flexible_array)
5438 flexible_array->type.ref->c = -1;
5439 }
5440 no_alloc: ;
5441 }
5442
5443 static void put_func_debug(Sym *sym)
5444 {
5445 char buf[512];
5446
5447 /* stabs info */
5448 /* XXX: we put here a dummy type */
5449 snprintf(buf, sizeof(buf), "%s:%c1",
5450 funcname, sym->type.t & VT_STATIC ? 'f' : 'F');
5451 put_stabs_r(buf, N_FUN, 0, file->line_num, 0,
5452 cur_text_section, sym->c);
5453 /* //gr gdb wants a line at the function */
5454 put_stabn(N_SLINE, 0, file->line_num, 0);
5455 last_ind = 0;
5456 last_line_num = 0;
5457 }
5458
5459 /* parse an old style function declaration list */
5460 /* XXX: check multiple parameter */
5461 static void func_decl_list(Sym *func_sym)
5462 {
5463 AttributeDef ad;
5464 int v;
5465 Sym *s;
5466 CType btype, type;
5467
5468 /* parse each declaration */
5469 while (tok != '{' && tok != ';' && tok != ',' && tok != TOK_EOF &&
5470 tok != TOK_ASM1 && tok != TOK_ASM2 && tok != TOK_ASM3) {
5471 if (!parse_btype(&btype, &ad))
5472 expect("declaration list");
5473 if (((btype.t & VT_BTYPE) == VT_ENUM ||
5474 (btype.t & VT_BTYPE) == VT_STRUCT) &&
5475 tok == ';') {
5476 /* we accept no variable after */
5477 } else {
5478 for(;;) {
5479 type = btype;
5480 type_decl(&type, &ad, &v, TYPE_DIRECT);
5481 /* find parameter in function parameter list */
5482 s = func_sym->next;
5483 while (s != NULL) {
5484 if ((s->v & ~SYM_FIELD) == v)
5485 goto found;
5486 s = s->next;
5487 }
5488 tcc_error("declaration for parameter '%s' but no such parameter",
5489 get_tok_str(v, NULL));
5490 found:
5491 /* check that no storage specifier except 'register' was given */
5492 if (type.t & VT_STORAGE)
5493 tcc_error("storage class specified for '%s'", get_tok_str(v, NULL));
5494 convert_parameter_type(&type);
5495 /* we can add the type (NOTE: it could be local to the function) */
5496 s->type = type;
5497 /* accept other parameters */
5498 if (tok == ',')
5499 next();
5500 else
5501 break;
5502 }
5503 }
5504 skip(';');
5505 }
5506 }
5507
5508 /* parse a function defined by symbol 'sym' and generate its code in
5509 'cur_text_section' */
5510 static void gen_function(Sym *sym)
5511 {
5512 int saved_nocode_wanted = nocode_wanted;
5513 nocode_wanted = 0;
5514 ind = cur_text_section->data_offset;
5515 /* NOTE: we patch the symbol size later */
5516 put_extern_sym(sym, cur_text_section, ind, 0);
5517 funcname = get_tok_str(sym->v, NULL);
5518 func_ind = ind;
5519 /* put debug symbol */
5520 if (tcc_state->do_debug)
5521 put_func_debug(sym);
5522 /* push a dummy symbol to enable local sym storage */
5523 sym_push2(&local_stack, SYM_FIELD, 0, 0);
5524 gfunc_prolog(&sym->type);
5525 rsym = 0;
5526 block(NULL, NULL, NULL, NULL, 0, 0);
5527 gsym(rsym);
5528 gfunc_epilog();
5529 cur_text_section->data_offset = ind;
5530 label_pop(&global_label_stack, NULL);
5531 /* reset local stack */
5532 scope_stack_bottom = NULL;
5533 sym_pop(&local_stack, NULL);
5534 /* end of function */
5535 /* patch symbol size */
5536 ((ElfW(Sym) *)symtab_section->data)[sym->c].st_size =
5537 ind - func_ind;
5538 /* patch symbol weakness (this definition overrules any prototype) */
5539 if (sym->type.t & VT_WEAK)
5540 weaken_symbol(sym);
5541 if (tcc_state->do_debug) {
5542 put_stabn(N_FUN, 0, 0, ind - func_ind);
5543 }
5544 /* It's better to crash than to generate wrong code */
5545 cur_text_section = NULL;
5546 funcname = ""; /* for safety */
5547 func_vt.t = VT_VOID; /* for safety */
5548 ind = 0; /* for safety */
5549 nocode_wanted = saved_nocode_wanted;
5550 }
5551
5552 ST_FUNC void gen_inline_functions(void)
5553 {
5554 Sym *sym;
5555 int *str, inline_generated, i;
5556 struct InlineFunc *fn;
5557
5558 /* iterate while inline function are referenced */
5559 for(;;) {
5560 inline_generated = 0;
5561 for (i = 0; i < tcc_state->nb_inline_fns; ++i) {
5562 fn = tcc_state->inline_fns[i];
5563 sym = fn->sym;
5564 if (sym && sym->c) {
5565 /* the function was used: generate its code and
5566 convert it to a normal function */
5567 str = fn->token_str;
5568 fn->sym = NULL;
5569 if (file)
5570 strcpy(file->filename, fn->filename);
5571 sym->r = VT_SYM | VT_CONST;
5572 sym->type.t &= ~VT_INLINE;
5573
5574 macro_ptr = str;
5575 next();
5576 cur_text_section = text_section;
5577 gen_function(sym);
5578 macro_ptr = NULL; /* fail safe */
5579
5580 inline_generated = 1;
5581 }
5582 }
5583 if (!inline_generated)
5584 break;
5585 }
5586 for (i = 0; i < tcc_state->nb_inline_fns; ++i) {
5587 fn = tcc_state->inline_fns[i];
5588 str = fn->token_str;
5589 tok_str_free(str);
5590 }
5591 dynarray_reset(&tcc_state->inline_fns, &tcc_state->nb_inline_fns);
5592 }
5593
5594 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
5595 static int decl0(int l, int is_for_loop_init)
5596 {
5597 int v, has_init, r;
5598 CType type, btype;
5599 Sym *sym;
5600 AttributeDef ad;
5601
5602 while (1) {
5603 if (!parse_btype(&btype, &ad)) {
5604 if (is_for_loop_init)
5605 return 0;
5606 /* skip redundant ';' */
5607 /* XXX: find more elegant solution */
5608 if (tok == ';') {
5609 next();
5610 continue;
5611 }
5612 if (l == VT_CONST &&
5613 (tok == TOK_ASM1 || tok == TOK_ASM2 || tok == TOK_ASM3)) {
5614 /* global asm block */
5615 asm_global_instr();
5616 continue;
5617 }
5618 /* special test for old K&R protos without explicit int
5619 type. Only accepted when defining global data */
5620 if (l == VT_LOCAL || tok < TOK_DEFINE)
5621 break;
5622 btype.t = VT_INT;
5623 }
5624 if (((btype.t & VT_BTYPE) == VT_ENUM ||
5625 (btype.t & VT_BTYPE) == VT_STRUCT) &&
5626 tok == ';') {
5627 /* we accept no variable after */
5628 next();
5629 continue;
5630 }
5631 while (1) { /* iterate thru each declaration */
5632 char *asm_label; // associated asm label
5633 type = btype;
5634 type_decl(&type, &ad, &v, TYPE_DIRECT);
5635 #if 0
5636 {
5637 char buf[500];
5638 type_to_str(buf, sizeof(buf), t, get_tok_str(v, NULL));
5639 printf("type = '%s'\n", buf);
5640 }
5641 #endif
5642 if ((type.t & VT_BTYPE) == VT_FUNC) {
5643 if ((type.t & VT_STATIC) && (l == VT_LOCAL)) {
5644 tcc_error("function without file scope cannot be static");
5645 }
5646 /* if old style function prototype, we accept a
5647 declaration list */
5648 sym = type.ref;
5649 if (sym->c == FUNC_OLD)
5650 func_decl_list(sym);
5651 }
5652
5653 asm_label = NULL;
5654 if (gnu_ext && (tok == TOK_ASM1 || tok == TOK_ASM2 || tok == TOK_ASM3)) {
5655 CString astr;
5656
5657 asm_label_instr(&astr);
5658 asm_label = tcc_strdup(astr.data);
5659 cstr_free(&astr);
5660
5661 /* parse one last attribute list, after asm label */
5662 parse_attribute(&ad);
5663 }
5664
5665 if (ad.weak)
5666 type.t |= VT_WEAK;
5667 #ifdef TCC_TARGET_PE
5668 if (ad.func_import)
5669 type.t |= VT_IMPORT;
5670 if (ad.func_export)
5671 type.t |= VT_EXPORT;
5672 #endif
5673 if (tok == '{') {
5674 if (l == VT_LOCAL)
5675 tcc_error("cannot use local functions");
5676 if ((type.t & VT_BTYPE) != VT_FUNC)
5677 expect("function definition");
5678
5679 /* reject abstract declarators in function definition */
5680 sym = type.ref;
5681 while ((sym = sym->next) != NULL)
5682 if (!(sym->v & ~SYM_FIELD))
5683 expect("identifier");
5684
5685 /* XXX: cannot do better now: convert extern line to static inline */
5686 if ((type.t & (VT_EXTERN | VT_INLINE)) == (VT_EXTERN | VT_INLINE))
5687 type.t = (type.t & ~VT_EXTERN) | VT_STATIC;
5688
5689 sym = sym_find(v);
5690 if (sym) {
5691 if ((sym->type.t & VT_BTYPE) != VT_FUNC)
5692 goto func_error1;
5693
5694 r = sym->type.ref->r;
5695 /* use func_call from prototype if not defined */
5696 if (FUNC_CALL(r) != FUNC_CDECL
5697 && FUNC_CALL(type.ref->r) == FUNC_CDECL)
5698 FUNC_CALL(type.ref->r) = FUNC_CALL(r);
5699
5700 /* use export from prototype */
5701 if (FUNC_EXPORT(r))
5702 FUNC_EXPORT(type.ref->r) = 1;
5703
5704 /* use static from prototype */
5705 if (sym->type.t & VT_STATIC)
5706 type.t = (type.t & ~VT_EXTERN) | VT_STATIC;
5707
5708 if (!is_compatible_types(&sym->type, &type)) {
5709 func_error1:
5710 tcc_error("incompatible types for redefinition of '%s'",
5711 get_tok_str(v, NULL));
5712 }
5713 /* if symbol is already defined, then put complete type */
5714 sym->type = type;
5715 } else {
5716 /* put function symbol */
5717 sym = global_identifier_push(v, type.t, 0);
5718 sym->type.ref = type.ref;
5719 }
5720
5721 /* static inline functions are just recorded as a kind
5722 of macro. Their code will be emitted at the end of
5723 the compilation unit only if they are used */
5724 if ((type.t & (VT_INLINE | VT_STATIC)) ==
5725 (VT_INLINE | VT_STATIC)) {
5726 TokenString func_str;
5727 int block_level;
5728 struct InlineFunc *fn;
5729 const char *filename;
5730
5731 tok_str_new(&func_str);
5732
5733 block_level = 0;
5734 for(;;) {
5735 int t;
5736 if (tok == TOK_EOF)
5737 tcc_error("unexpected end of file");
5738 tok_str_add_tok(&func_str);
5739 t = tok;
5740 next();
5741 if (t == '{') {
5742 block_level++;
5743 } else if (t == '}') {
5744 block_level--;
5745 if (block_level == 0)
5746 break;
5747 }
5748 }
5749 tok_str_add(&func_str, -1);
5750 tok_str_add(&func_str, 0);
5751 filename = file ? file->filename : "";
5752 fn = tcc_malloc(sizeof *fn + strlen(filename));
5753 strcpy(fn->filename, filename);
5754 fn->sym = sym;
5755 fn->token_str = func_str.str;
5756 dynarray_add((void ***)&tcc_state->inline_fns, &tcc_state->nb_inline_fns, fn);
5757
5758 } else {
5759 /* compute text section */
5760 cur_text_section = ad.section;
5761 if (!cur_text_section)
5762 cur_text_section = text_section;
5763 sym->r = VT_SYM | VT_CONST;
5764 gen_function(sym);
5765 }
5766 break;
5767 } else {
5768 if (btype.t & VT_TYPEDEF) {
5769 /* save typedefed type */
5770 /* XXX: test storage specifiers ? */
5771 sym = sym_push(v, &type, INT_ATTR(&ad), 0);
5772 sym->type.t |= VT_TYPEDEF;
5773 } else {
5774 r = 0;
5775 if ((type.t & VT_BTYPE) == VT_FUNC) {
5776 /* external function definition */
5777 /* specific case for func_call attribute */
5778 type.ref->r = INT_ATTR(&ad);
5779 } else if (!(type.t & VT_ARRAY)) {
5780 /* not lvalue if array */
5781 r |= lvalue_type(type.t);
5782 }
5783 has_init = (tok == '=');
5784 if (has_init && (type.t & VT_VLA))
5785 tcc_error("Variable length array cannot be initialized");
5786 if ((btype.t & VT_EXTERN) || ((type.t & VT_BTYPE) == VT_FUNC) ||
5787 ((type.t & VT_ARRAY) && (type.t & VT_STATIC) &&
5788 !has_init && l == VT_CONST && type.ref->c < 0)) {
5789 /* external variable or function */
5790 /* NOTE: as GCC, uninitialized global static
5791 arrays of null size are considered as
5792 extern */
5793 sym = external_sym(v, &type, r, asm_label);
5794
5795 if (type.t & VT_WEAK)
5796 weaken_symbol(sym);
5797
5798 if (ad.alias_target) {
5799 Section tsec;
5800 Elf32_Sym *esym;
5801 Sym *alias_target;
5802
5803 alias_target = sym_find(ad.alias_target);
5804 if (!alias_target || !alias_target->c)
5805 tcc_error("unsupported forward __alias__ attribute");
5806 esym = &((Elf32_Sym *)symtab_section->data)[alias_target->c];
5807 tsec.sh_num = esym->st_shndx;
5808 put_extern_sym2(sym, &tsec, esym->st_value, esym->st_size, 0);
5809 }
5810 } else {
5811 type.t |= (btype.t & VT_STATIC); /* Retain "static". */
5812 if (type.t & VT_STATIC)
5813 r |= VT_CONST;
5814 else
5815 r |= l;
5816 if (has_init)
5817 next();
5818 decl_initializer_alloc(&type, &ad, r, has_init, v, asm_label, l);
5819 }
5820 }
5821 if (tok != ',') {
5822 if (is_for_loop_init)
5823 return 1;
5824 skip(';');
5825 break;
5826 }
5827 next();
5828 }
5829 ad.aligned = 0;
5830 }
5831 }
5832 return 0;
5833 }
5834
5835 ST_FUNC void decl(int l)
5836 {
5837 decl0(l, 0);
5838 }
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