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re-added negative-array-size testcase and fixed fix for it
[tinycc/miki.git] / tccgen.c
blobe488c6506b82a1fe538cdc1753f72499f56066db
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 *define_stack;
54 ST_DATA Sym *global_label_stack;
55 ST_DATA Sym *local_label_stack;
56
57 ST_DATA SValue vstack[VSTACK_SIZE], *vtop;
58
59 ST_DATA int const_wanted; /* true if constant wanted */
60 ST_DATA int nocode_wanted; /* true if no code generation wanted for an expression */
61 ST_DATA int global_expr; /* true if compound literals must be allocated globally (used during initializers parsing */
62 ST_DATA CType func_vt; /* current function return type (used by return instruction) */
63 ST_DATA int func_vc;
64 ST_DATA int last_line_num, last_ind, func_ind; /* debug last line number and pc */
65 ST_DATA char *funcname;
66
67 ST_DATA CType char_pointer_type, func_old_type, int_type;
68
69 /* ------------------------------------------------------------------------- */
70 static void gen_cast(CType *type);
71 static inline CType *pointed_type(CType *type);
72 static int is_compatible_types(CType *type1, CType *type2);
73 static int parse_btype(CType *type, AttributeDef *ad);
74 static void type_decl(CType *type, AttributeDef *ad, int *v, int td);
75 static void parse_expr_type(CType *type);
76 static void decl_initializer(CType *type, Section *sec, unsigned long c, int first, int size_only);
77 static void block(int *bsym, int *csym, int *case_sym, int *def_sym, int case_reg, int is_expr);
78 static void decl_initializer_alloc(CType *type, AttributeDef *ad, int r, int has_init, int v, char *asm_label, int scope);
79 static int decl0(int l, int is_for_loop_init);
80 static void expr_eq(void);
81 static void unary_type(CType *type);
82 static void vla_runtime_type_size(CType *type, int *a);
83 static int is_compatible_parameter_types(CType *type1, CType *type2);
84 static void expr_type(CType *type);
85
86 ST_INLN int is_float(int t)
87 {
88 int bt;
89 bt = t & VT_BTYPE;
90 return bt == VT_LDOUBLE || bt == VT_DOUBLE || bt == VT_FLOAT;
91 }
92
93 ST_FUNC void test_lvalue(void)
94 {
95 if (!(vtop->r & VT_LVAL))
96 expect("lvalue");
97 }
98
99 /* ------------------------------------------------------------------------- */
100 /* symbol allocator */
101 static Sym *__sym_malloc(void)
102 {
103 Sym *sym_pool, *sym, *last_sym;
104 int i;
105
106 sym_pool = tcc_malloc(SYM_POOL_NB * sizeof(Sym));
107 dynarray_add(&sym_pools, &nb_sym_pools, sym_pool);
108
109 last_sym = sym_free_first;
110 sym = sym_pool;
111 for(i = 0; i < SYM_POOL_NB; i++) {
112 sym->next = last_sym;
113 last_sym = sym;
114 sym++;
115 }
116 sym_free_first = last_sym;
117 return last_sym;
118 }
119
120 static inline Sym *sym_malloc(void)
121 {
122 Sym *sym;
123 sym = sym_free_first;
124 if (!sym)
125 sym = __sym_malloc();
126 sym_free_first = sym->next;
127 return sym;
128 }
129
130 ST_INLN void sym_free(Sym *sym)
131 {
132 sym->next = sym_free_first;
133 tcc_free(sym->asm_label);
134 sym_free_first = sym;
135 }
136
137 /* push, without hashing */
138 ST_FUNC Sym *sym_push2(Sym **ps, int v, int t, long c)
139 {
140 Sym *s;
141 s = sym_malloc();
142 s->asm_label = NULL;
143 s->v = v;
144 s->type.t = t;
145 s->type.ref = NULL;
146 #ifdef _WIN64
147 s->d = NULL;
148 #endif
149 s->c = c;
150 s->next = NULL;
151 /* add in stack */
152 s->prev = *ps;
153 *ps = s;
154 return s;
155 }
156
157 /* find a symbol and return its associated structure. 's' is the top
158 of the symbol stack */
159 ST_FUNC Sym *sym_find2(Sym *s, int v)
160 {
161 while (s) {
162 if (s->v == v)
163 return s;
164 s = s->prev;
165 }
166 return NULL;
167 }
168
169 /* structure lookup */
170 ST_INLN Sym *struct_find(int v)
171 {
172 v -= TOK_IDENT;
173 if ((unsigned)v >= (unsigned)(tok_ident - TOK_IDENT))
174 return NULL;
175 return table_ident[v]->sym_struct;
176 }
177
178 /* find an identifier */
179 ST_INLN Sym *sym_find(int v)
180 {
181 v -= TOK_IDENT;
182 if ((unsigned)v >= (unsigned)(tok_ident - TOK_IDENT))
183 return NULL;
184 return table_ident[v]->sym_identifier;
185 }
186
187 /* push a given symbol on the symbol stack */
188 ST_FUNC Sym *sym_push(int v, CType *type, int r, int c)
189 {
190 Sym *s, **ps;
191 TokenSym *ts;
192
193 if (local_stack)
194 ps = &local_stack;
195 else
196 ps = &global_stack;
197 s = sym_push2(ps, v, type->t, c);
198 s->type.ref = type->ref;
199 s->r = r;
200 /* don't record fields or anonymous symbols */
201 /* XXX: simplify */
202 if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM) {
203 /* record symbol in token array */
204 ts = table_ident[(v & ~SYM_STRUCT) - TOK_IDENT];
205 if (v & SYM_STRUCT)
206 ps = &ts->sym_struct;
207 else
208 ps = &ts->sym_identifier;
209 s->prev_tok = *ps;
210 *ps = s;
211 }
212 return s;
213 }
214
215 /* push a global identifier */
216 ST_FUNC Sym *global_identifier_push(int v, int t, int c)
217 {
218 Sym *s, **ps;
219 s = sym_push2(&global_stack, v, t, c);
220 /* don't record anonymous symbol */
221 if (v < SYM_FIRST_ANOM) {
222 ps = &table_ident[v - TOK_IDENT]->sym_identifier;
223 /* modify the top most local identifier, so that
224 sym_identifier will point to 's' when popped */
225 while (*ps != NULL)
226 ps = &(*ps)->prev_tok;
227 s->prev_tok = NULL;
228 *ps = s;
229 }
230 return s;
231 }
232
233 /* pop symbols until top reaches 'b' */
234 ST_FUNC void sym_pop(Sym **ptop, Sym *b)
235 {
236 Sym *s, *ss, **ps;
237 TokenSym *ts;
238 int v;
239
240 s = *ptop;
241 while(s != b) {
242 ss = s->prev;
243 v = s->v;
244 /* remove symbol in token array */
245 /* XXX: simplify */
246 if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM) {
247 ts = table_ident[(v & ~SYM_STRUCT) - TOK_IDENT];
248 if (v & SYM_STRUCT)
249 ps = &ts->sym_struct;
250 else
251 ps = &ts->sym_identifier;
252 *ps = s->prev_tok;
253 }
254 sym_free(s);
255 s = ss;
256 }
257 *ptop = b;
258 }
259
260 static void weaken_symbol(Sym *sym)
261 {
262 sym->type.t |= VT_WEAK;
263 if (sym->c > 0) {
264 int esym_type;
265 ElfW(Sym) *esym;
266
267 esym = &((ElfW(Sym) *)symtab_section->data)[sym->c];
268 esym_type = ELFW(ST_TYPE)(esym->st_info);
269 esym->st_info = ELFW(ST_INFO)(STB_WEAK, esym_type);
270 }
271 }
272
273 /* ------------------------------------------------------------------------- */
274
275 ST_FUNC void swap(int *p, int *q)
276 {
277 int t;
278 t = *p;
279 *p = *q;
280 *q = t;
281 }
282
283 static void vsetc(CType *type, int r, CValue *vc)
284 {
285 int v;
286
287 if (vtop >= vstack + (VSTACK_SIZE - 1))
288 error("memory full");
289 /* cannot let cpu flags if other instruction are generated. Also
290 avoid leaving VT_JMP anywhere except on the top of the stack
291 because it would complicate the code generator. */
292 if (vtop >= vstack) {
293 v = vtop->r & VT_VALMASK;
294 if (v == VT_CMP || (v & ~1) == VT_JMP)
295 gv(RC_INT);
296 }
297 vtop++;
298 vtop->type = *type;
299 vtop->r = r;
300 vtop->r2 = VT_CONST;
301 vtop->c = *vc;
302 }
303
304 /* push constant of type "type" with useless value */
305 void vpush(CType *type)
306 {
307 CValue cval;
308 vsetc(type, VT_CONST, &cval);
309 }
310
311 /* push integer constant */
312 ST_FUNC void vpushi(int v)
313 {
314 CValue cval;
315 cval.i = v;
316 vsetc(&int_type, VT_CONST, &cval);
317 }
318
319 /* push long long constant */
320 static void vpushll(long long v)
321 {
322 CValue cval;
323 CType ctype;
324 ctype.t = VT_LLONG;
325 ctype.ref = 0;
326 cval.ull = v;
327 vsetc(&ctype, VT_CONST, &cval);
328 }
329
330 /* push arbitrary 64bit constant */
331 void vpush64(int ty, unsigned long long v)
332 {
333 CValue cval;
334 CType ctype;
335 ctype.t = ty;
336 cval.ull = v;
337 vsetc(&ctype, VT_CONST, &cval);
338 }
339
340 /* Return a static symbol pointing to a section */
341 ST_FUNC Sym *get_sym_ref(CType *type, Section *sec, unsigned long offset, unsigned long size)
342 {
343 int v;
344 Sym *sym;
345
346 v = anon_sym++;
347 sym = global_identifier_push(v, type->t | VT_STATIC, 0);
348 sym->type.ref = type->ref;
349 sym->r = VT_CONST | VT_SYM;
350 put_extern_sym(sym, sec, offset, size);
351 return sym;
352 }
353
354 /* push a reference to a section offset by adding a dummy symbol */
355 static void vpush_ref(CType *type, Section *sec, unsigned long offset, unsigned long size)
356 {
357 CValue cval;
358
359 cval.ul = 0;
360 vsetc(type, VT_CONST | VT_SYM, &cval);
361 vtop->sym = get_sym_ref(type, sec, offset, size);
362 }
363
364 /* define a new external reference to a symbol 'v' of type 'u' */
365 ST_FUNC Sym *external_global_sym(int v, CType *type, int r)
366 {
367 Sym *s;
368
369 s = sym_find(v);
370 if (!s) {
371 /* push forward reference */
372 s = global_identifier_push(v, type->t | VT_EXTERN, 0);
373 s->type.ref = type->ref;
374 s->r = r | VT_CONST | VT_SYM;
375 }
376 return s;
377 }
378
379 /* define a new external reference to a symbol 'v' with alternate asm
380 name 'asm_label' of type 'u'. 'asm_label' is equal to NULL if there
381 is no alternate name (most cases) */
382 static Sym *external_sym(int v, CType *type, int r, char *asm_label)
383 {
384 Sym *s;
385
386 s = sym_find(v);
387 if (!s) {
388 /* push forward reference */
389 s = sym_push(v, type, r | VT_CONST | VT_SYM, 0);
390 s->asm_label = asm_label;
391 s->type.t |= VT_EXTERN;
392 } else if (s->type.ref == func_old_type.ref) {
393 s->type.ref = type->ref;
394 s->r = r | VT_CONST | VT_SYM;
395 s->type.t |= VT_EXTERN;
396 } else if (!is_compatible_types(&s->type, type)) {
397 error("incompatible types for redefinition of '%s'",
398 get_tok_str(v, NULL));
399 }
400 return s;
401 }
402
403 /* push a reference to global symbol v */
404 ST_FUNC void vpush_global_sym(CType *type, int v)
405 {
406 Sym *sym;
407 CValue cval;
408
409 sym = external_global_sym(v, type, 0);
410 cval.ul = 0;
411 vsetc(type, VT_CONST | VT_SYM, &cval);
412 vtop->sym = sym;
413 }
414
415 ST_FUNC void vset(CType *type, int r, int v)
416 {
417 CValue cval;
418
419 cval.i = v;
420 vsetc(type, r, &cval);
421 }
422
423 static void vseti(int r, int v)
424 {
425 CType type;
426 type.t = VT_INT;
427 type.ref = 0;
428 vset(&type, r, v);
429 }
430
431 ST_FUNC void vswap(void)
432 {
433 SValue tmp;
434
435 tmp = vtop[0];
436 vtop[0] = vtop[-1];
437 vtop[-1] = tmp;
438 }
439
440 ST_FUNC void vpushv(SValue *v)
441 {
442 if (vtop >= vstack + (VSTACK_SIZE - 1))
443 error("memory full");
444 vtop++;
445 *vtop = *v;
446 }
447
448 static void vdup(void)
449 {
450 vpushv(vtop);
451 }
452
453 /* save r to the memory stack, and mark it as being free */
454 ST_FUNC void save_reg(int r)
455 {
456 int l, saved, size, align;
457 SValue *p, sv;
458 CType *type;
459
460 /* modify all stack values */
461 saved = 0;
462 l = 0;
463 for(p=vstack;p<=vtop;p++) {
464 if ((p->r & VT_VALMASK) == r ||
465 ((p->type.t & VT_BTYPE) == VT_LLONG && (p->r2 & VT_VALMASK) == r)) {
466 /* must save value on stack if not already done */
467 if (!saved) {
468 /* NOTE: must reload 'r' because r might be equal to r2 */
469 r = p->r & VT_VALMASK;
470 /* store register in the stack */
471 type = &p->type;
472 if ((p->r & VT_LVAL) ||
473 (!is_float(type->t) && (type->t & VT_BTYPE) != VT_LLONG))
474 #ifdef TCC_TARGET_X86_64
475 type = &char_pointer_type;
476 #else
477 type = &int_type;
478 #endif
479 size = type_size(type, &align);
480 loc = (loc - size) & -align;
481 sv.type.t = type->t;
482 sv.r = VT_LOCAL | VT_LVAL;
483 sv.c.ul = loc;
484 store(r, &sv);
485 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
486 /* x86 specific: need to pop fp register ST0 if saved */
487 if (r == TREG_ST0) {
488 o(0xd8dd); /* fstp %st(0) */
489 }
490 #endif
491 #ifndef TCC_TARGET_X86_64
492 /* special long long case */
493 if ((type->t & VT_BTYPE) == VT_LLONG) {
494 sv.c.ul += 4;
495 store(p->r2, &sv);
496 }
497 #endif
498 l = loc;
499 saved = 1;
500 }
501 /* mark that stack entry as being saved on the stack */
502 if (p->r & VT_LVAL) {
503 /* also clear the bounded flag because the
504 relocation address of the function was stored in
505 p->c.ul */
506 p->r = (p->r & ~(VT_VALMASK | VT_BOUNDED)) | VT_LLOCAL;
507 } else {
508 p->r = lvalue_type(p->type.t) | VT_LOCAL;
509 }
510 p->r2 = VT_CONST;
511 p->c.ul = l;
512 }
513 }
514 }
515
516 #ifdef TCC_TARGET_ARM
517 /* find a register of class 'rc2' with at most one reference on stack.
518 * If none, call get_reg(rc) */
519 ST_FUNC int get_reg_ex(int rc, int rc2)
520 {
521 int r;
522 SValue *p;
523
524 for(r=0;r<NB_REGS;r++) {
525 if (reg_classes[r] & rc2) {
526 int n;
527 n=0;
528 for(p = vstack; p <= vtop; p++) {
529 if ((p->r & VT_VALMASK) == r ||
530 (p->r2 & VT_VALMASK) == r)
531 n++;
532 }
533 if (n <= 1)
534 return r;
535 }
536 }
537 return get_reg(rc);
538 }
539 #endif
540
541 /* find a free register of class 'rc'. If none, save one register */
542 ST_FUNC int get_reg(int rc)
543 {
544 int r;
545 SValue *p;
546
547 /* find a free register */
548 for(r=0;r<NB_REGS;r++) {
549 if (reg_classes[r] & rc) {
550 for(p=vstack;p<=vtop;p++) {
551 if ((p->r & VT_VALMASK) == r ||
552 (p->r2 & VT_VALMASK) == r)
553 goto notfound;
554 }
555 return r;
556 }
557 notfound: ;
558 }
559
560 /* no register left : free the first one on the stack (VERY
561 IMPORTANT to start from the bottom to ensure that we don't
562 spill registers used in gen_opi()) */
563 for(p=vstack;p<=vtop;p++) {
564 r = p->r & VT_VALMASK;
565 if (r < VT_CONST && (reg_classes[r] & rc))
566 goto save_found;
567 /* also look at second register (if long long) */
568 r = p->r2 & VT_VALMASK;
569 if (r < VT_CONST && (reg_classes[r] & rc)) {
570 save_found:
571 save_reg(r);
572 return r;
573 }
574 }
575 /* Should never comes here */
576 return -1;
577 }
578
579 /* save registers up to (vtop - n) stack entry */
580 ST_FUNC void save_regs(int n)
581 {
582 int r;
583 SValue *p, *p1;
584 p1 = vtop - n;
585 for(p = vstack;p <= p1; p++) {
586 r = p->r & VT_VALMASK;
587 if (r < VT_CONST) {
588 save_reg(r);
589 }
590 }
591 }
592
593 /* move register 's' to 'r', and flush previous value of r to memory
594 if needed */
595 static void move_reg(int r, int s)
596 {
597 SValue sv;
598
599 if (r != s) {
600 save_reg(r);
601 sv.type.t = VT_INT;
602 sv.r = s;
603 sv.c.ul = 0;
604 load(r, &sv);
605 }
606 }
607
608 /* get address of vtop (vtop MUST BE an lvalue) */
609 static void gaddrof(void)
610 {
611 if (vtop->r & VT_REF)
612 gv(RC_INT);
613 vtop->r &= ~VT_LVAL;
614 /* tricky: if saved lvalue, then we can go back to lvalue */
615 if ((vtop->r & VT_VALMASK) == VT_LLOCAL)
616 vtop->r = (vtop->r & ~(VT_VALMASK | VT_LVAL_TYPE)) | VT_LOCAL | VT_LVAL;
617
618
619 }
620
621 #ifdef CONFIG_TCC_BCHECK
622 /* generate lvalue bound code */
623 static void gbound(void)
624 {
625 int lval_type;
626 CType type1;
627
628 vtop->r &= ~VT_MUSTBOUND;
629 /* if lvalue, then use checking code before dereferencing */
630 if (vtop->r & VT_LVAL) {
631 /* if not VT_BOUNDED value, then make one */
632 if (!(vtop->r & VT_BOUNDED)) {
633 lval_type = vtop->r & (VT_LVAL_TYPE | VT_LVAL);
634 /* must save type because we must set it to int to get pointer */
635 type1 = vtop->type;
636 vtop->type.t = VT_INT;
637 gaddrof();
638 vpushi(0);
639 gen_bounded_ptr_add();
640 vtop->r |= lval_type;
641 vtop->type = type1;
642 }
643 /* then check for dereferencing */
644 gen_bounded_ptr_deref();
645 }
646 }
647 #endif
648
649 /* store vtop a register belonging to class 'rc'. lvalues are
650 converted to values. Cannot be used if cannot be converted to
651 register value (such as structures). */
652 ST_FUNC int gv(int rc)
653 {
654 int r, bit_pos, bit_size, size, align, i;
655 #ifndef TCC_TARGET_X86_64
656 int rc2;
657 #endif
658
659 /* NOTE: get_reg can modify vstack[] */
660 if (vtop->type.t & VT_BITFIELD) {
661 CType type;
662 int bits = 32;
663 bit_pos = (vtop->type.t >> VT_STRUCT_SHIFT) & 0x3f;
664 bit_size = (vtop->type.t >> (VT_STRUCT_SHIFT + 6)) & 0x3f;
665 /* remove bit field info to avoid loops */
666 vtop->type.t &= ~(VT_BITFIELD | (-1 << VT_STRUCT_SHIFT));
667 /* cast to int to propagate signedness in following ops */
668 if ((vtop->type.t & VT_BTYPE) == VT_LLONG) {
669 type.t = VT_LLONG;
670 bits = 64;
671 } else
672 type.t = VT_INT;
673 if((vtop->type.t & VT_UNSIGNED) ||
674 (vtop->type.t & VT_BTYPE) == VT_BOOL)
675 type.t |= VT_UNSIGNED;
676 gen_cast(&type);
677 /* generate shifts */
678 vpushi(bits - (bit_pos + bit_size));
679 gen_op(TOK_SHL);
680 vpushi(bits - bit_size);
681 /* NOTE: transformed to SHR if unsigned */
682 gen_op(TOK_SAR);
683 r = gv(rc);
684 } else {
685 if (is_float(vtop->type.t) &&
686 (vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
687 Sym *sym;
688 int *ptr;
689 unsigned long offset;
690 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
691 CValue check;
692 #endif
693
694 /* XXX: unify with initializers handling ? */
695 /* CPUs usually cannot use float constants, so we store them
696 generically in data segment */
697 size = type_size(&vtop->type, &align);
698 offset = (data_section->data_offset + align - 1) & -align;
699 data_section->data_offset = offset;
700 /* XXX: not portable yet */
701 #if defined(__i386__) || defined(__x86_64__)
702 /* Zero pad x87 tenbyte long doubles */
703 if (size == LDOUBLE_SIZE)
704 vtop->c.tab[2] &= 0xffff;
705 #endif
706 ptr = section_ptr_add(data_section, size);
707 size = size >> 2;
708 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
709 check.d = 1;
710 if(check.tab[0])
711 for(i=0;i<size;i++)
712 ptr[i] = vtop->c.tab[size-1-i];
713 else
714 #endif
715 for(i=0;i<size;i++)
716 ptr[i] = vtop->c.tab[i];
717 sym = get_sym_ref(&vtop->type, data_section, offset, size << 2);
718 vtop->r |= VT_LVAL | VT_SYM;
719 vtop->sym = sym;
720 vtop->c.ul = 0;
721 }
722 #ifdef CONFIG_TCC_BCHECK
723 if (vtop->r & VT_MUSTBOUND)
724 gbound();
725 #endif
726
727 r = vtop->r & VT_VALMASK;
728 #ifndef TCC_TARGET_X86_64
729 rc2 = RC_INT;
730 if (rc == RC_IRET)
731 rc2 = RC_LRET;
732 #endif
733 /* need to reload if:
734 - constant
735 - lvalue (need to dereference pointer)
736 - already a register, but not in the right class */
737 if (r >= VT_CONST
738 || (vtop->r & VT_LVAL)
739 || !(reg_classes[r] & rc)
740 #ifndef TCC_TARGET_X86_64
741 || ((vtop->type.t & VT_BTYPE) == VT_LLONG && !(reg_classes[vtop->r2] & rc2))
742 #endif
743 )
744 {
745 r = get_reg(rc);
746 #ifndef TCC_TARGET_X86_64
747 if ((vtop->type.t & VT_BTYPE) == VT_LLONG) {
748 int r2;
749 unsigned long long ll;
750 /* two register type load : expand to two words
751 temporarily */
752 if ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
753 /* load constant */
754 ll = vtop->c.ull;
755 vtop->c.ui = ll; /* first word */
756 load(r, vtop);
757 vtop->r = r; /* save register value */
758 vpushi(ll >> 32); /* second word */
759 } else if (r >= VT_CONST || /* XXX: test to VT_CONST incorrect ? */
760 (vtop->r & VT_LVAL)) {
761 /* We do not want to modifier the long long
762 pointer here, so the safest (and less
763 efficient) is to save all the other registers
764 in the stack. XXX: totally inefficient. */
765 save_regs(1);
766 /* load from memory */
767 load(r, vtop);
768 vdup();
769 vtop[-1].r = r; /* save register value */
770 /* increment pointer to get second word */
771 vtop->type.t = VT_INT;
772 gaddrof();
773 vpushi(4);
774 gen_op('+');
775 vtop->r |= VT_LVAL;
776 } else {
777 /* move registers */
778 load(r, vtop);
779 vdup();
780 vtop[-1].r = r; /* save register value */
781 vtop->r = vtop[-1].r2;
782 }
783 /* allocate second register */
784 r2 = get_reg(rc2);
785 load(r2, vtop);
786 vpop();
787 /* write second register */
788 vtop->r2 = r2;
789 } else
790 #endif
791 if ((vtop->r & VT_LVAL) && !is_float(vtop->type.t)) {
792 int t1, t;
793 /* lvalue of scalar type : need to use lvalue type
794 because of possible cast */
795 t = vtop->type.t;
796 t1 = t;
797 /* compute memory access type */
798 if (vtop->r & VT_LVAL_BYTE)
799 t = VT_BYTE;
800 else if (vtop->r & VT_LVAL_SHORT)
801 t = VT_SHORT;
802 if (vtop->r & VT_LVAL_UNSIGNED)
803 t |= VT_UNSIGNED;
804 vtop->type.t = t;
805 load(r, vtop);
806 /* restore wanted type */
807 vtop->type.t = t1;
808 } else {
809 /* one register type load */
810 load(r, vtop);
811 }
812 }
813 vtop->r = r;
814 #ifdef TCC_TARGET_C67
815 /* uses register pairs for doubles */
816 if ((vtop->type.t & VT_BTYPE) == VT_DOUBLE)
817 vtop->r2 = r+1;
818 #endif
819 }
820 return r;
821 }
822
823 /* generate vtop[-1] and vtop[0] in resp. classes rc1 and rc2 */
824 ST_FUNC void gv2(int rc1, int rc2)
825 {
826 int v;
827
828 /* generate more generic register first. But VT_JMP or VT_CMP
829 values must be generated first in all cases to avoid possible
830 reload errors */
831 v = vtop[0].r & VT_VALMASK;
832 if (v != VT_CMP && (v & ~1) != VT_JMP && rc1 <= rc2) {
833 vswap();
834 gv(rc1);
835 vswap();
836 gv(rc2);
837 /* test if reload is needed for first register */
838 if ((vtop[-1].r & VT_VALMASK) >= VT_CONST) {
839 vswap();
840 gv(rc1);
841 vswap();
842 }
843 } else {
844 gv(rc2);
845 vswap();
846 gv(rc1);
847 vswap();
848 /* test if reload is needed for first register */
849 if ((vtop[0].r & VT_VALMASK) >= VT_CONST) {
850 gv(rc2);
851 }
852 }
853 }
854
855 /* wrapper around RC_FRET to return a register by type */
856 static int rc_fret(int t)
857 {
858 #ifdef TCC_TARGET_X86_64
859 if (t == VT_LDOUBLE) {
860 return RC_ST0;
861 }
862 #endif
863 return RC_FRET;
864 }
865
866 /* wrapper around REG_FRET to return a register by type */
867 static int reg_fret(int t)
868 {
869 #ifdef TCC_TARGET_X86_64
870 if (t == VT_LDOUBLE) {
871 return TREG_ST0;
872 }
873 #endif
874 return REG_FRET;
875 }
876
877 /* expand long long on stack in two int registers */
878 static void lexpand(void)
879 {
880 int u;
881
882 u = vtop->type.t & VT_UNSIGNED;
883 gv(RC_INT);
884 vdup();
885 vtop[0].r = vtop[-1].r2;
886 vtop[0].r2 = VT_CONST;
887 vtop[-1].r2 = VT_CONST;
888 vtop[0].type.t = VT_INT | u;
889 vtop[-1].type.t = VT_INT | u;
890 }
891
892 #ifdef TCC_TARGET_ARM
893 /* expand long long on stack */
894 ST_FUNC void lexpand_nr(void)
895 {
896 int u,v;
897
898 u = vtop->type.t & VT_UNSIGNED;
899 vdup();
900 vtop->r2 = VT_CONST;
901 vtop->type.t = VT_INT | u;
902 v=vtop[-1].r & (VT_VALMASK | VT_LVAL);
903 if (v == VT_CONST) {
904 vtop[-1].c.ui = vtop->c.ull;
905 vtop->c.ui = vtop->c.ull >> 32;
906 vtop->r = VT_CONST;
907 } else if (v == (VT_LVAL|VT_CONST) || v == (VT_LVAL|VT_LOCAL)) {
908 vtop->c.ui += 4;
909 vtop->r = vtop[-1].r;
910 } else if (v > VT_CONST) {
911 vtop--;
912 lexpand();
913 } else
914 vtop->r = vtop[-1].r2;
915 vtop[-1].r2 = VT_CONST;
916 vtop[-1].type.t = VT_INT | u;
917 }
918 #endif
919
920 /* build a long long from two ints */
921 static void lbuild(int t)
922 {
923 gv2(RC_INT, RC_INT);
924 vtop[-1].r2 = vtop[0].r;
925 vtop[-1].type.t = t;
926 vpop();
927 }
928
929 /* rotate n first stack elements to the bottom
930 I1 ... In -> I2 ... In I1 [top is right]
931 */
932 static void vrotb(int n)
933 {
934 int i;
935 SValue tmp;
936
937 tmp = vtop[-n + 1];
938 for(i=-n+1;i!=0;i++)
939 vtop[i] = vtop[i+1];
940 vtop[0] = tmp;
941 }
942
943 /* rotate n first stack elements to the top
944 I1 ... In -> In I1 ... I(n-1) [top is right]
945 */
946 ST_FUNC void vrott(int n)
947 {
948 int i;
949 SValue tmp;
950
951 tmp = vtop[0];
952 for(i = 0;i < n - 1; i++)
953 vtop[-i] = vtop[-i - 1];
954 vtop[-n + 1] = tmp;
955 }
956
957 #ifdef TCC_TARGET_ARM
958 /* like vrott but in other direction
959 In ... I1 -> I(n-1) ... I1 In [top is right]
960 */
961 ST_FUNC void vnrott(int n)
962 {
963 int i;
964 SValue tmp;
965
966 tmp = vtop[-n + 1];
967 for(i = n - 1; i > 0; i--)
968 vtop[-i] = vtop[-i + 1];
969 vtop[0] = tmp;
970 }
971 #endif
972
973 /* pop stack value */
974 ST_FUNC void vpop(void)
975 {
976 int v;
977 v = vtop->r & VT_VALMASK;
978 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
979 /* for x86, we need to pop the FP stack */
980 if (v == TREG_ST0 && !nocode_wanted) {
981 o(0xd8dd); /* fstp %st(0) */
982 } else
983 #endif
984 if (v == VT_JMP || v == VT_JMPI) {
985 /* need to put correct jump if && or || without test */
986 gsym(vtop->c.ul);
987 }
988 vtop--;
989 }
990
991 /* convert stack entry to register and duplicate its value in another
992 register */
993 static void gv_dup(void)
994 {
995 int rc, t, r, r1;
996 SValue sv;
997
998 t = vtop->type.t;
999 if ((t & VT_BTYPE) == VT_LLONG) {
1000 lexpand();
1001 gv_dup();
1002 vswap();
1003 vrotb(3);
1004 gv_dup();
1005 vrotb(4);
1006 /* stack: H L L1 H1 */
1007 lbuild(t);
1008 vrotb(3);
1009 vrotb(3);
1010 vswap();
1011 lbuild(t);
1012 vswap();
1013 } else {
1014 /* duplicate value */
1015 rc = RC_INT;
1016 sv.type.t = VT_INT;
1017 if (is_float(t)) {
1018 rc = RC_FLOAT;
1019 #ifdef TCC_TARGET_X86_64
1020 if ((t & VT_BTYPE) == VT_LDOUBLE) {
1021 rc = RC_ST0;
1022 }
1023 #endif
1024 sv.type.t = t;
1025 }
1026 r = gv(rc);
1027 r1 = get_reg(rc);
1028 sv.r = r;
1029 sv.c.ul = 0;
1030 load(r1, &sv); /* move r to r1 */
1031 vdup();
1032 /* duplicates value */
1033 if (r != r1)
1034 vtop->r = r1;
1035 }
1036 }
1037
1038 #ifndef TCC_TARGET_X86_64
1039 /* generate CPU independent (unsigned) long long operations */
1040 static void gen_opl(int op)
1041 {
1042 int t, a, b, op1, c, i;
1043 int func;
1044 unsigned short reg_iret = REG_IRET;
1045 unsigned short reg_lret = REG_LRET;
1046 SValue tmp;
1047
1048 switch(op) {
1049 case '/':
1050 case TOK_PDIV:
1051 func = TOK___divdi3;
1052 goto gen_func;
1053 case TOK_UDIV:
1054 func = TOK___udivdi3;
1055 goto gen_func;
1056 case '%':
1057 func = TOK___moddi3;
1058 goto gen_mod_func;
1059 case TOK_UMOD:
1060 func = TOK___umoddi3;
1061 gen_mod_func:
1062 #ifdef TCC_ARM_EABI
1063 reg_iret = TREG_R2;
1064 reg_lret = TREG_R3;
1065 #endif
1066 gen_func:
1067 /* call generic long long function */
1068 vpush_global_sym(&func_old_type, func);
1069 vrott(3);
1070 gfunc_call(2);
1071 vpushi(0);
1072 vtop->r = reg_iret;
1073 vtop->r2 = reg_lret;
1074 break;
1075 case '^':
1076 case '&':
1077 case '|':
1078 case '*':
1079 case '+':
1080 case '-':
1081 t = vtop->type.t;
1082 vswap();
1083 lexpand();
1084 vrotb(3);
1085 lexpand();
1086 /* stack: L1 H1 L2 H2 */
1087 tmp = vtop[0];
1088 vtop[0] = vtop[-3];
1089 vtop[-3] = tmp;
1090 tmp = vtop[-2];
1091 vtop[-2] = vtop[-3];
1092 vtop[-3] = tmp;
1093 vswap();
1094 /* stack: H1 H2 L1 L2 */
1095 if (op == '*') {
1096 vpushv(vtop - 1);
1097 vpushv(vtop - 1);
1098 gen_op(TOK_UMULL);
1099 lexpand();
1100 /* stack: H1 H2 L1 L2 ML MH */
1101 for(i=0;i<4;i++)
1102 vrotb(6);
1103 /* stack: ML MH H1 H2 L1 L2 */
1104 tmp = vtop[0];
1105 vtop[0] = vtop[-2];
1106 vtop[-2] = tmp;
1107 /* stack: ML MH H1 L2 H2 L1 */
1108 gen_op('*');
1109 vrotb(3);
1110 vrotb(3);
1111 gen_op('*');
1112 /* stack: ML MH M1 M2 */
1113 gen_op('+');
1114 gen_op('+');
1115 } else if (op == '+' || op == '-') {
1116 /* XXX: add non carry method too (for MIPS or alpha) */
1117 if (op == '+')
1118 op1 = TOK_ADDC1;
1119 else
1120 op1 = TOK_SUBC1;
1121 gen_op(op1);
1122 /* stack: H1 H2 (L1 op L2) */
1123 vrotb(3);
1124 vrotb(3);
1125 gen_op(op1 + 1); /* TOK_xxxC2 */
1126 } else {
1127 gen_op(op);
1128 /* stack: H1 H2 (L1 op L2) */
1129 vrotb(3);
1130 vrotb(3);
1131 /* stack: (L1 op L2) H1 H2 */
1132 gen_op(op);
1133 /* stack: (L1 op L2) (H1 op H2) */
1134 }
1135 /* stack: L H */
1136 lbuild(t);
1137 break;
1138 case TOK_SAR:
1139 case TOK_SHR:
1140 case TOK_SHL:
1141 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
1142 t = vtop[-1].type.t;
1143 vswap();
1144 lexpand();
1145 vrotb(3);
1146 /* stack: L H shift */
1147 c = (int)vtop->c.i;
1148 /* constant: simpler */
1149 /* NOTE: all comments are for SHL. the other cases are
1150 done by swaping words */
1151 vpop();
1152 if (op != TOK_SHL)
1153 vswap();
1154 if (c >= 32) {
1155 /* stack: L H */
1156 vpop();
1157 if (c > 32) {
1158 vpushi(c - 32);
1159 gen_op(op);
1160 }
1161 if (op != TOK_SAR) {
1162 vpushi(0);
1163 } else {
1164 gv_dup();
1165 vpushi(31);
1166 gen_op(TOK_SAR);
1167 }
1168 vswap();
1169 } else {
1170 vswap();
1171 gv_dup();
1172 /* stack: H L L */
1173 vpushi(c);
1174 gen_op(op);
1175 vswap();
1176 vpushi(32 - c);
1177 if (op == TOK_SHL)
1178 gen_op(TOK_SHR);
1179 else
1180 gen_op(TOK_SHL);
1181 vrotb(3);
1182 /* stack: L L H */
1183 vpushi(c);
1184 if (op == TOK_SHL)
1185 gen_op(TOK_SHL);
1186 else
1187 gen_op(TOK_SHR);
1188 gen_op('|');
1189 }
1190 if (op != TOK_SHL)
1191 vswap();
1192 lbuild(t);
1193 } else {
1194 /* XXX: should provide a faster fallback on x86 ? */
1195 switch(op) {
1196 case TOK_SAR:
1197 func = TOK___ashrdi3;
1198 goto gen_func;
1199 case TOK_SHR:
1200 func = TOK___lshrdi3;
1201 goto gen_func;
1202 case TOK_SHL:
1203 func = TOK___ashldi3;
1204 goto gen_func;
1205 }
1206 }
1207 break;
1208 default:
1209 /* compare operations */
1210 t = vtop->type.t;
1211 vswap();
1212 lexpand();
1213 vrotb(3);
1214 lexpand();
1215 /* stack: L1 H1 L2 H2 */
1216 tmp = vtop[-1];
1217 vtop[-1] = vtop[-2];
1218 vtop[-2] = tmp;
1219 /* stack: L1 L2 H1 H2 */
1220 /* compare high */
1221 op1 = op;
1222 /* when values are equal, we need to compare low words. since
1223 the jump is inverted, we invert the test too. */
1224 if (op1 == TOK_LT)
1225 op1 = TOK_LE;
1226 else if (op1 == TOK_GT)
1227 op1 = TOK_GE;
1228 else if (op1 == TOK_ULT)
1229 op1 = TOK_ULE;
1230 else if (op1 == TOK_UGT)
1231 op1 = TOK_UGE;
1232 a = 0;
1233 b = 0;
1234 gen_op(op1);
1235 if (op1 != TOK_NE) {
1236 a = gtst(1, 0);
1237 }
1238 if (op != TOK_EQ) {
1239 /* generate non equal test */
1240 /* XXX: NOT PORTABLE yet */
1241 if (a == 0) {
1242 b = gtst(0, 0);
1243 } else {
1244 #if defined(TCC_TARGET_I386)
1245 b = psym(0x850f, 0);
1246 #elif defined(TCC_TARGET_ARM)
1247 b = ind;
1248 o(0x1A000000 | encbranch(ind, 0, 1));
1249 #elif defined(TCC_TARGET_C67)
1250 error("not implemented");
1251 #else
1252 #error not supported
1253 #endif
1254 }
1255 }
1256 /* compare low. Always unsigned */
1257 op1 = op;
1258 if (op1 == TOK_LT)
1259 op1 = TOK_ULT;
1260 else if (op1 == TOK_LE)
1261 op1 = TOK_ULE;
1262 else if (op1 == TOK_GT)
1263 op1 = TOK_UGT;
1264 else if (op1 == TOK_GE)
1265 op1 = TOK_UGE;
1266 gen_op(op1);
1267 a = gtst(1, a);
1268 gsym(b);
1269 vseti(VT_JMPI, a);
1270 break;
1271 }
1272 }
1273 #endif
1274
1275 /* handle integer constant optimizations and various machine
1276 independent opt */
1277 static void gen_opic(int op)
1278 {
1279 int c1, c2, t1, t2, n;
1280 SValue *v1, *v2;
1281 long long l1, l2;
1282 typedef unsigned long long U;
1283
1284 v1 = vtop - 1;
1285 v2 = vtop;
1286 t1 = v1->type.t & VT_BTYPE;
1287 t2 = v2->type.t & VT_BTYPE;
1288
1289 if (t1 == VT_LLONG)
1290 l1 = v1->c.ll;
1291 else if (v1->type.t & VT_UNSIGNED)
1292 l1 = v1->c.ui;
1293 else
1294 l1 = v1->c.i;
1295
1296 if (t2 == VT_LLONG)
1297 l2 = v2->c.ll;
1298 else if (v2->type.t & VT_UNSIGNED)
1299 l2 = v2->c.ui;
1300 else
1301 l2 = v2->c.i;
1302
1303 /* currently, we cannot do computations with forward symbols */
1304 c1 = (v1->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1305 c2 = (v2->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1306 if (c1 && c2) {
1307 switch(op) {
1308 case '+': l1 += l2; break;
1309 case '-': l1 -= l2; break;
1310 case '&': l1 &= l2; break;
1311 case '^': l1 ^= l2; break;
1312 case '|': l1 |= l2; break;
1313 case '*': l1 *= l2; break;
1314
1315 case TOK_PDIV:
1316 case '/':
1317 case '%':
1318 case TOK_UDIV:
1319 case TOK_UMOD:
1320 /* if division by zero, generate explicit division */
1321 if (l2 == 0) {
1322 if (const_wanted)
1323 error("division by zero in constant");
1324 goto general_case;
1325 }
1326 switch(op) {
1327 default: l1 /= l2; break;
1328 case '%': l1 %= l2; break;
1329 case TOK_UDIV: l1 = (U)l1 / l2; break;
1330 case TOK_UMOD: l1 = (U)l1 % l2; break;
1331 }
1332 break;
1333 case TOK_SHL: l1 <<= l2; break;
1334 case TOK_SHR: l1 = (U)l1 >> l2; break;
1335 case TOK_SAR: l1 >>= l2; break;
1336 /* tests */
1337 case TOK_ULT: l1 = (U)l1 < (U)l2; break;
1338 case TOK_UGE: l1 = (U)l1 >= (U)l2; break;
1339 case TOK_EQ: l1 = l1 == l2; break;
1340 case TOK_NE: l1 = l1 != l2; break;
1341 case TOK_ULE: l1 = (U)l1 <= (U)l2; break;
1342 case TOK_UGT: l1 = (U)l1 > (U)l2; break;
1343 case TOK_LT: l1 = l1 < l2; break;
1344 case TOK_GE: l1 = l1 >= l2; break;
1345 case TOK_LE: l1 = l1 <= l2; break;
1346 case TOK_GT: l1 = l1 > l2; break;
1347 /* logical */
1348 case TOK_LAND: l1 = l1 && l2; break;
1349 case TOK_LOR: l1 = l1 || l2; break;
1350 default:
1351 goto general_case;
1352 }
1353 v1->c.ll = l1;
1354 vtop--;
1355 } else {
1356 /* if commutative ops, put c2 as constant */
1357 if (c1 && (op == '+' || op == '&' || op == '^' ||
1358 op == '|' || op == '*')) {
1359 vswap();
1360 c2 = c1; //c = c1, c1 = c2, c2 = c;
1361 l2 = l1; //l = l1, l1 = l2, l2 = l;
1362 }
1363 /* Filter out NOP operations like x*1, x-0, x&-1... */
1364 if (c2 && (((op == '*' || op == '/' || op == TOK_UDIV ||
1365 op == TOK_PDIV) &&
1366 l2 == 1) ||
1367 ((op == '+' || op == '-' || op == '|' || op == '^' ||
1368 op == TOK_SHL || op == TOK_SHR || op == TOK_SAR) &&
1369 l2 == 0) ||
1370 (op == '&' &&
1371 l2 == -1))) {
1372 /* nothing to do */
1373 vtop--;
1374 } else if (c2 && (op == '*' || op == TOK_PDIV || op == TOK_UDIV)) {
1375 /* try to use shifts instead of muls or divs */
1376 if (l2 > 0 && (l2 & (l2 - 1)) == 0) {
1377 n = -1;
1378 while (l2) {
1379 l2 >>= 1;
1380 n++;
1381 }
1382 vtop->c.ll = n;
1383 if (op == '*')
1384 op = TOK_SHL;
1385 else if (op == TOK_PDIV)
1386 op = TOK_SAR;
1387 else
1388 op = TOK_SHR;
1389 }
1390 goto general_case;
1391 } else if (c2 && (op == '+' || op == '-') &&
1392 (((vtop[-1].r & (VT_VALMASK | VT_LVAL | VT_SYM)) == (VT_CONST | VT_SYM))
1393 || (vtop[-1].r & (VT_VALMASK | VT_LVAL)) == VT_LOCAL)) {
1394 /* symbol + constant case */
1395 if (op == '-')
1396 l2 = -l2;
1397 vtop--;
1398 vtop->c.ll += l2;
1399 } else {
1400 general_case:
1401 if (!nocode_wanted) {
1402 /* call low level op generator */
1403 if (t1 == VT_LLONG || t2 == VT_LLONG)
1404 gen_opl(op);
1405 else
1406 gen_opi(op);
1407 } else {
1408 vtop--;
1409 }
1410 }
1411 }
1412 }
1413
1414 /* generate a floating point operation with constant propagation */
1415 static void gen_opif(int op)
1416 {
1417 int c1, c2;
1418 SValue *v1, *v2;
1419 long double f1, f2;
1420
1421 v1 = vtop - 1;
1422 v2 = vtop;
1423 /* currently, we cannot do computations with forward symbols */
1424 c1 = (v1->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1425 c2 = (v2->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1426 if (c1 && c2) {
1427 if (v1->type.t == VT_FLOAT) {
1428 f1 = v1->c.f;
1429 f2 = v2->c.f;
1430 } else if (v1->type.t == VT_DOUBLE) {
1431 f1 = v1->c.d;
1432 f2 = v2->c.d;
1433 } else {
1434 f1 = v1->c.ld;
1435 f2 = v2->c.ld;
1436 }
1437
1438 /* NOTE: we only do constant propagation if finite number (not
1439 NaN or infinity) (ANSI spec) */
1440 if (!ieee_finite(f1) || !ieee_finite(f2))
1441 goto general_case;
1442
1443 switch(op) {
1444 case '+': f1 += f2; break;
1445 case '-': f1 -= f2; break;
1446 case '*': f1 *= f2; break;
1447 case '/':
1448 if (f2 == 0.0) {
1449 if (const_wanted)
1450 error("division by zero in constant");
1451 goto general_case;
1452 }
1453 f1 /= f2;
1454 break;
1455 /* XXX: also handles tests ? */
1456 default:
1457 goto general_case;
1458 }
1459 /* XXX: overflow test ? */
1460 if (v1->type.t == VT_FLOAT) {
1461 v1->c.f = f1;
1462 } else if (v1->type.t == VT_DOUBLE) {
1463 v1->c.d = f1;
1464 } else {
1465 v1->c.ld = f1;
1466 }
1467 vtop--;
1468 } else {
1469 general_case:
1470 if (!nocode_wanted) {
1471 gen_opf(op);
1472 } else {
1473 vtop--;
1474 }
1475 }
1476 }
1477
1478 static int pointed_size(CType *type)
1479 {
1480 int align;
1481 return type_size(pointed_type(type), &align);
1482 }
1483
1484 static void vla_runtime_pointed_size(CType *type)
1485 {
1486 int align;
1487 vla_runtime_type_size(pointed_type(type), &align);
1488 }
1489
1490 static inline int is_null_pointer(SValue *p)
1491 {
1492 if ((p->r & (VT_VALMASK | VT_LVAL | VT_SYM)) != VT_CONST)
1493 return 0;
1494 return ((p->type.t & VT_BTYPE) == VT_INT && p->c.i == 0) ||
1495 ((p->type.t & VT_BTYPE) == VT_LLONG && p->c.ll == 0);
1496 }
1497
1498 static inline int is_integer_btype(int bt)
1499 {
1500 return (bt == VT_BYTE || bt == VT_SHORT ||
1501 bt == VT_INT || bt == VT_LLONG);
1502 }
1503
1504 /* check types for comparison or substraction of pointers */
1505 static void check_comparison_pointer_types(SValue *p1, SValue *p2, int op)
1506 {
1507 CType *type1, *type2, tmp_type1, tmp_type2;
1508 int bt1, bt2;
1509
1510 /* null pointers are accepted for all comparisons as gcc */
1511 if (is_null_pointer(p1) || is_null_pointer(p2))
1512 return;
1513 type1 = &p1->type;
1514 type2 = &p2->type;
1515 bt1 = type1->t & VT_BTYPE;
1516 bt2 = type2->t & VT_BTYPE;
1517 /* accept comparison between pointer and integer with a warning */
1518 if ((is_integer_btype(bt1) || is_integer_btype(bt2)) && op != '-') {
1519 if (op != TOK_LOR && op != TOK_LAND )
1520 warning("comparison between pointer and integer");
1521 return;
1522 }
1523
1524 /* both must be pointers or implicit function pointers */
1525 if (bt1 == VT_PTR) {
1526 type1 = pointed_type(type1);
1527 } else if (bt1 != VT_FUNC)
1528 goto invalid_operands;
1529
1530 if (bt2 == VT_PTR) {
1531 type2 = pointed_type(type2);
1532 } else if (bt2 != VT_FUNC) {
1533 invalid_operands:
1534 error("invalid operands to binary %s", get_tok_str(op, NULL));
1535 }
1536 if ((type1->t & VT_BTYPE) == VT_VOID ||
1537 (type2->t & VT_BTYPE) == VT_VOID)
1538 return;
1539 tmp_type1 = *type1;
1540 tmp_type2 = *type2;
1541 tmp_type1.t &= ~(VT_UNSIGNED | VT_CONSTANT | VT_VOLATILE);
1542 tmp_type2.t &= ~(VT_UNSIGNED | VT_CONSTANT | VT_VOLATILE);
1543 if (!is_compatible_types(&tmp_type1, &tmp_type2)) {
1544 /* gcc-like error if '-' is used */
1545 if (op == '-')
1546 goto invalid_operands;
1547 else
1548 warning("comparison of distinct pointer types lacks a cast");
1549 }
1550 }
1551
1552 /* generic gen_op: handles types problems */
1553 ST_FUNC void gen_op(int op)
1554 {
1555 int u, t1, t2, bt1, bt2, t;
1556 CType type1;
1557
1558 t1 = vtop[-1].type.t;
1559 t2 = vtop[0].type.t;
1560 bt1 = t1 & VT_BTYPE;
1561 bt2 = t2 & VT_BTYPE;
1562
1563 if (bt1 == VT_PTR || bt2 == VT_PTR) {
1564 /* at least one operand is a pointer */
1565 /* relationnal op: must be both pointers */
1566 if (op >= TOK_ULT && op <= TOK_LOR) {
1567 check_comparison_pointer_types(vtop - 1, vtop, op);
1568 /* pointers are handled are unsigned */
1569 #ifdef TCC_TARGET_X86_64
1570 t = VT_LLONG | VT_UNSIGNED;
1571 #else
1572 t = VT_INT | VT_UNSIGNED;
1573 #endif
1574 goto std_op;
1575 }
1576 /* if both pointers, then it must be the '-' op */
1577 if (bt1 == VT_PTR && bt2 == VT_PTR) {
1578 if (op != '-')
1579 error("cannot use pointers here");
1580 check_comparison_pointer_types(vtop - 1, vtop, op);
1581 /* XXX: check that types are compatible */
1582 if (vtop[-1].type.t & VT_VLA) {
1583 vla_runtime_pointed_size(&vtop[-1].type);
1584 } else {
1585 vpushi(pointed_size(&vtop[-1].type));
1586 }
1587 vrott(3);
1588 gen_opic(op);
1589 /* set to integer type */
1590 #ifdef TCC_TARGET_X86_64
1591 vtop->type.t = VT_LLONG;
1592 #else
1593 vtop->type.t = VT_INT;
1594 #endif
1595 vswap();
1596 gen_op(TOK_PDIV);
1597 } else {
1598 /* exactly one pointer : must be '+' or '-'. */
1599 if (op != '-' && op != '+')
1600 error("cannot use pointers here");
1601 /* Put pointer as first operand */
1602 if (bt2 == VT_PTR) {
1603 vswap();
1604 swap(&t1, &t2);
1605 }
1606 type1 = vtop[-1].type;
1607 type1.t &= ~VT_ARRAY;
1608 if (vtop[-1].type.t & VT_VLA)
1609 vla_runtime_pointed_size(&vtop[-1].type);
1610 else {
1611 u = pointed_size(&vtop[-1].type);
1612 if (u < 0)
1613 error("unknown array element size");
1614 #ifdef TCC_TARGET_X86_64
1615 vpushll(u);
1616 #else
1617 /* XXX: cast to int ? (long long case) */
1618 vpushi(u);
1619 #endif
1620 }
1621 gen_op('*');
1622 #ifdef CONFIG_TCC_BCHECK
1623 /* if evaluating constant expression, no code should be
1624 generated, so no bound check */
1625 if (tcc_state->do_bounds_check && !const_wanted) {
1626 /* if bounded pointers, we generate a special code to
1627 test bounds */
1628 if (op == '-') {
1629 vpushi(0);
1630 vswap();
1631 gen_op('-');
1632 }
1633 gen_bounded_ptr_add();
1634 } else
1635 #endif
1636 {
1637 gen_opic(op);
1638 }
1639 /* put again type if gen_opic() swaped operands */
1640 vtop->type = type1;
1641 }
1642 } else if (is_float(bt1) || is_float(bt2)) {
1643 /* compute bigger type and do implicit casts */
1644 if (bt1 == VT_LDOUBLE || bt2 == VT_LDOUBLE) {
1645 t = VT_LDOUBLE;
1646 } else if (bt1 == VT_DOUBLE || bt2 == VT_DOUBLE) {
1647 t = VT_DOUBLE;
1648 } else {
1649 t = VT_FLOAT;
1650 }
1651 /* floats can only be used for a few operations */
1652 if (op != '+' && op != '-' && op != '*' && op != '/' &&
1653 (op < TOK_ULT || op > TOK_GT))
1654 error("invalid operands for binary operation");
1655 goto std_op;
1656 } else if (bt1 == VT_LLONG || bt2 == VT_LLONG) {
1657 /* cast to biggest op */
1658 t = VT_LLONG;
1659 /* convert to unsigned if it does not fit in a long long */
1660 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED) ||
1661 (t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED))
1662 t |= VT_UNSIGNED;
1663 goto std_op;
1664 } else {
1665 /* integer operations */
1666 t = VT_INT;
1667 /* convert to unsigned if it does not fit in an integer */
1668 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED) ||
1669 (t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED))
1670 t |= VT_UNSIGNED;
1671 std_op:
1672 /* XXX: currently, some unsigned operations are explicit, so
1673 we modify them here */
1674 if (t & VT_UNSIGNED) {
1675 if (op == TOK_SAR)
1676 op = TOK_SHR;
1677 else if (op == '/')
1678 op = TOK_UDIV;
1679 else if (op == '%')
1680 op = TOK_UMOD;
1681 else if (op == TOK_LT)
1682 op = TOK_ULT;
1683 else if (op == TOK_GT)
1684 op = TOK_UGT;
1685 else if (op == TOK_LE)
1686 op = TOK_ULE;
1687 else if (op == TOK_GE)
1688 op = TOK_UGE;
1689 }
1690 vswap();
1691 type1.t = t;
1692 gen_cast(&type1);
1693 vswap();
1694 /* special case for shifts and long long: we keep the shift as
1695 an integer */
1696 if (op == TOK_SHR || op == TOK_SAR || op == TOK_SHL)
1697 type1.t = VT_INT;
1698 gen_cast(&type1);
1699 if (is_float(t))
1700 gen_opif(op);
1701 else
1702 gen_opic(op);
1703 if (op >= TOK_ULT && op <= TOK_GT) {
1704 /* relationnal op: the result is an int */
1705 vtop->type.t = VT_INT;
1706 } else {
1707 vtop->type.t = t;
1708 }
1709 }
1710 }
1711
1712 #ifndef TCC_TARGET_ARM
1713 /* generic itof for unsigned long long case */
1714 static void gen_cvt_itof1(int t)
1715 {
1716 if ((vtop->type.t & (VT_BTYPE | VT_UNSIGNED)) ==
1717 (VT_LLONG | VT_UNSIGNED)) {
1718
1719 if (t == VT_FLOAT)
1720 vpush_global_sym(&func_old_type, TOK___floatundisf);
1721 #if LDOUBLE_SIZE != 8
1722 else if (t == VT_LDOUBLE)
1723 vpush_global_sym(&func_old_type, TOK___floatundixf);
1724 #endif
1725 else
1726 vpush_global_sym(&func_old_type, TOK___floatundidf);
1727 vrott(2);
1728 gfunc_call(1);
1729 vpushi(0);
1730 vtop->r = reg_fret(t);
1731 } else {
1732 gen_cvt_itof(t);
1733 }
1734 }
1735 #endif
1736
1737 /* generic ftoi for unsigned long long case */
1738 static void gen_cvt_ftoi1(int t)
1739 {
1740 int st;
1741
1742 if (t == (VT_LLONG | VT_UNSIGNED)) {
1743 /* not handled natively */
1744 st = vtop->type.t & VT_BTYPE;
1745 if (st == VT_FLOAT)
1746 vpush_global_sym(&func_old_type, TOK___fixunssfdi);
1747 #if LDOUBLE_SIZE != 8
1748 else if (st == VT_LDOUBLE)
1749 vpush_global_sym(&func_old_type, TOK___fixunsxfdi);
1750 #endif
1751 else
1752 vpush_global_sym(&func_old_type, TOK___fixunsdfdi);
1753 vrott(2);
1754 gfunc_call(1);
1755 vpushi(0);
1756 vtop->r = REG_IRET;
1757 vtop->r2 = REG_LRET;
1758 } else {
1759 gen_cvt_ftoi(t);
1760 }
1761 }
1762
1763 /* force char or short cast */
1764 static void force_charshort_cast(int t)
1765 {
1766 int bits, dbt;
1767 dbt = t & VT_BTYPE;
1768 /* XXX: add optimization if lvalue : just change type and offset */
1769 if (dbt == VT_BYTE)
1770 bits = 8;
1771 else
1772 bits = 16;
1773 if (t & VT_UNSIGNED) {
1774 vpushi((1 << bits) - 1);
1775 gen_op('&');
1776 } else {
1777 bits = 32 - bits;
1778 vpushi(bits);
1779 gen_op(TOK_SHL);
1780 /* result must be signed or the SAR is converted to an SHL
1781 This was not the case when "t" was a signed short
1782 and the last value on the stack was an unsigned int */
1783 vtop->type.t &= ~VT_UNSIGNED;
1784 vpushi(bits);
1785 gen_op(TOK_SAR);
1786 }
1787 }
1788
1789 /* cast 'vtop' to 'type'. Casting to bitfields is forbidden. */
1790 static void gen_cast(CType *type)
1791 {
1792 int sbt, dbt, sf, df, c, p;
1793
1794 /* special delayed cast for char/short */
1795 /* XXX: in some cases (multiple cascaded casts), it may still
1796 be incorrect */
1797 if (vtop->r & VT_MUSTCAST) {
1798 vtop->r &= ~VT_MUSTCAST;
1799 force_charshort_cast(vtop->type.t);
1800 }
1801
1802 /* bitfields first get cast to ints */
1803 if (vtop->type.t & VT_BITFIELD) {
1804 gv(RC_INT);
1805 }
1806
1807 dbt = type->t & (VT_BTYPE | VT_UNSIGNED);
1808 sbt = vtop->type.t & (VT_BTYPE | VT_UNSIGNED);
1809
1810 if (sbt != dbt) {
1811 sf = is_float(sbt);
1812 df = is_float(dbt);
1813 c = (vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1814 p = (vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == (VT_CONST | VT_SYM);
1815 if (c) {
1816 /* constant case: we can do it now */
1817 /* XXX: in ISOC, cannot do it if error in convert */
1818 if (sbt == VT_FLOAT)
1819 vtop->c.ld = vtop->c.f;
1820 else if (sbt == VT_DOUBLE)
1821 vtop->c.ld = vtop->c.d;
1822
1823 if (df) {
1824 if ((sbt & VT_BTYPE) == VT_LLONG) {
1825 if (sbt & VT_UNSIGNED)
1826 vtop->c.ld = vtop->c.ull;
1827 else
1828 vtop->c.ld = vtop->c.ll;
1829 } else if(!sf) {
1830 if (sbt & VT_UNSIGNED)
1831 vtop->c.ld = vtop->c.ui;
1832 else
1833 vtop->c.ld = vtop->c.i;
1834 }
1835
1836 if (dbt == VT_FLOAT)
1837 vtop->c.f = (float)vtop->c.ld;
1838 else if (dbt == VT_DOUBLE)
1839 vtop->c.d = (double)vtop->c.ld;
1840 } else if (sf && dbt == (VT_LLONG|VT_UNSIGNED)) {
1841 vtop->c.ull = (unsigned long long)vtop->c.ld;
1842 } else if (sf && dbt == VT_BOOL) {
1843 vtop->c.i = (vtop->c.ld != 0);
1844 } else {
1845 if(sf)
1846 vtop->c.ll = (long long)vtop->c.ld;
1847 else if (sbt == (VT_LLONG|VT_UNSIGNED))
1848 vtop->c.ll = vtop->c.ull;
1849 else if (sbt & VT_UNSIGNED)
1850 vtop->c.ll = vtop->c.ui;
1851 #ifdef TCC_TARGET_X86_64
1852 else if (sbt == VT_PTR)
1853 ;
1854 #endif
1855 else if (sbt != VT_LLONG)
1856 vtop->c.ll = vtop->c.i;
1857
1858 if (dbt == (VT_LLONG|VT_UNSIGNED))
1859 vtop->c.ull = vtop->c.ll;
1860 else if (dbt == VT_BOOL)
1861 vtop->c.i = (vtop->c.ll != 0);
1862 else if (dbt != VT_LLONG) {
1863 int s = 0;
1864 if ((dbt & VT_BTYPE) == VT_BYTE)
1865 s = 24;
1866 else if ((dbt & VT_BTYPE) == VT_SHORT)
1867 s = 16;
1868
1869 if(dbt & VT_UNSIGNED)
1870 vtop->c.ui = ((unsigned int)vtop->c.ll << s) >> s;
1871 else
1872 vtop->c.i = ((int)vtop->c.ll << s) >> s;
1873 }
1874 }
1875 } else if (p && dbt == VT_BOOL) {
1876 vtop->r = VT_CONST;
1877 vtop->c.i = 1;
1878 } else if (!nocode_wanted) {
1879 /* non constant case: generate code */
1880 if (sf && df) {
1881 /* convert from fp to fp */
1882 gen_cvt_ftof(dbt);
1883 } else if (df) {
1884 /* convert int to fp */
1885 gen_cvt_itof1(dbt);
1886 } else if (sf) {
1887 /* convert fp to int */
1888 if (dbt == VT_BOOL) {
1889 vpushi(0);
1890 gen_op(TOK_NE);
1891 } else {
1892 /* we handle char/short/etc... with generic code */
1893 if (dbt != (VT_INT | VT_UNSIGNED) &&
1894 dbt != (VT_LLONG | VT_UNSIGNED) &&
1895 dbt != VT_LLONG)
1896 dbt = VT_INT;
1897 gen_cvt_ftoi1(dbt);
1898 if (dbt == VT_INT && (type->t & (VT_BTYPE | VT_UNSIGNED)) != dbt) {
1899 /* additional cast for char/short... */
1900 vtop->type.t = dbt;
1901 gen_cast(type);
1902 }
1903 }
1904 #ifndef TCC_TARGET_X86_64
1905 } else if ((dbt & VT_BTYPE) == VT_LLONG) {
1906 if ((sbt & VT_BTYPE) != VT_LLONG) {
1907 /* scalar to long long */
1908 /* machine independent conversion */
1909 gv(RC_INT);
1910 /* generate high word */
1911 if (sbt == (VT_INT | VT_UNSIGNED)) {
1912 vpushi(0);
1913 gv(RC_INT);
1914 } else {
1915 if (sbt == VT_PTR) {
1916 /* cast from pointer to int before we apply
1917 shift operation, which pointers don't support*/
1918 gen_cast(&int_type);
1919 }
1920 gv_dup();
1921 vpushi(31);
1922 gen_op(TOK_SAR);
1923 }
1924 /* patch second register */
1925 vtop[-1].r2 = vtop->r;
1926 vpop();
1927 }
1928 #else
1929 } else if ((dbt & VT_BTYPE) == VT_LLONG ||
1930 (dbt & VT_BTYPE) == VT_PTR ||
1931 (dbt & VT_BTYPE) == VT_FUNC) {
1932 if ((sbt & VT_BTYPE) != VT_LLONG &&
1933 (sbt & VT_BTYPE) != VT_PTR &&
1934 (sbt & VT_BTYPE) != VT_FUNC) {
1935 /* need to convert from 32bit to 64bit */
1936 int r = gv(RC_INT);
1937 if (sbt != (VT_INT | VT_UNSIGNED)) {
1938 /* x86_64 specific: movslq */
1939 o(0x6348);
1940 o(0xc0 + (REG_VALUE(r) << 3) + REG_VALUE(r));
1941 }
1942 }
1943 #endif
1944 } else if (dbt == VT_BOOL) {
1945 /* scalar to bool */
1946 vpushi(0);
1947 gen_op(TOK_NE);
1948 } else if ((dbt & VT_BTYPE) == VT_BYTE ||
1949 (dbt & VT_BTYPE) == VT_SHORT) {
1950 if (sbt == VT_PTR) {
1951 vtop->type.t = VT_INT;
1952 warning("nonportable conversion from pointer to char/short");
1953 }
1954 force_charshort_cast(dbt);
1955 } else if ((dbt & VT_BTYPE) == VT_INT) {
1956 /* scalar to int */
1957 if (sbt == VT_LLONG) {
1958 /* from long long: just take low order word */
1959 lexpand();
1960 vpop();
1961 }
1962 /* if lvalue and single word type, nothing to do because
1963 the lvalue already contains the real type size (see
1964 VT_LVAL_xxx constants) */
1965 }
1966 }
1967 } else if ((dbt & VT_BTYPE) == VT_PTR && !(vtop->r & VT_LVAL)) {
1968 /* if we are casting between pointer types,
1969 we must update the VT_LVAL_xxx size */
1970 vtop->r = (vtop->r & ~VT_LVAL_TYPE)
1971 | (lvalue_type(type->ref->type.t) & VT_LVAL_TYPE);
1972 }
1973 vtop->type = *type;
1974 }
1975
1976 /* return type size as known at compile time. Put alignment at 'a' */
1977 ST_FUNC int type_size(CType *type, int *a)
1978 {
1979 Sym *s;
1980 int bt;
1981
1982 bt = type->t & VT_BTYPE;
1983 if (bt == VT_STRUCT) {
1984 /* struct/union */
1985 s = type->ref;
1986 *a = s->r;
1987 return s->c;
1988 } else if (bt == VT_PTR) {
1989 if (type->t & VT_ARRAY) {
1990 int ts;
1991
1992 s = type->ref;
1993 ts = type_size(&s->type, a);
1994
1995 if (ts < 0 && s->c < 0)
1996 ts = -ts;
1997
1998 return ts * s->c;
1999 } else {
2000 *a = PTR_SIZE;
2001 return PTR_SIZE;
2002 }
2003 } else if (bt == VT_LDOUBLE) {
2004 *a = LDOUBLE_ALIGN;
2005 return LDOUBLE_SIZE;
2006 } else if (bt == VT_DOUBLE || bt == VT_LLONG) {
2007 #ifdef TCC_TARGET_I386
2008 #ifdef TCC_TARGET_PE
2009 *a = 8;
2010 #else
2011 *a = 4;
2012 #endif
2013 #elif defined(TCC_TARGET_ARM)
2014 #ifdef TCC_ARM_EABI
2015 *a = 8;
2016 #else
2017 *a = 4;
2018 #endif
2019 #else
2020 *a = 8;
2021 #endif
2022 return 8;
2023 } else if (bt == VT_INT || bt == VT_ENUM || bt == VT_FLOAT) {
2024 *a = 4;
2025 return 4;
2026 } else if (bt == VT_SHORT) {
2027 *a = 2;
2028 return 2;
2029 } else {
2030 /* char, void, function, _Bool */
2031 *a = 1;
2032 return 1;
2033 }
2034 }
2035
2036 /* push type size as known at runtime time on top of value stack. Put
2037 alignment at 'a' */
2038 ST_FUNC void vla_runtime_type_size(CType *type, int *a)
2039 {
2040 if (type->t & VT_VLA) {
2041 vset(&int_type, VT_LOCAL|VT_LVAL, type->ref->c);
2042 } else {
2043 vpushi(type_size(type, a));
2044 }
2045 }
2046
2047 /* return the pointed type of t */
2048 static inline CType *pointed_type(CType *type)
2049 {
2050 return &type->ref->type;
2051 }
2052
2053 /* modify type so that its it is a pointer to type. */
2054 ST_FUNC void mk_pointer(CType *type)
2055 {
2056 Sym *s;
2057 s = sym_push(SYM_FIELD, type, 0, -1);
2058 type->t = VT_PTR | (type->t & ~VT_TYPE);
2059 type->ref = s;
2060 }
2061
2062 /* compare function types. OLD functions match any new functions */
2063 static int is_compatible_func(CType *type1, CType *type2)
2064 {
2065 Sym *s1, *s2;
2066
2067 s1 = type1->ref;
2068 s2 = type2->ref;
2069 if (!is_compatible_types(&s1->type, &s2->type))
2070 return 0;
2071 /* check func_call */
2072 if (FUNC_CALL(s1->r) != FUNC_CALL(s2->r))
2073 return 0;
2074 /* XXX: not complete */
2075 if (s1->c == FUNC_OLD || s2->c == FUNC_OLD)
2076 return 1;
2077 if (s1->c != s2->c)
2078 return 0;
2079 while (s1 != NULL) {
2080 if (s2 == NULL)
2081 return 0;
2082 if (!is_compatible_parameter_types(&s1->type, &s2->type))
2083 return 0;
2084 s1 = s1->next;
2085 s2 = s2->next;
2086 }
2087 if (s2)
2088 return 0;
2089 return 1;
2090 }
2091
2092 /* return true if type1 and type2 are the same. If unqualified is
2093 true, qualifiers on the types are ignored.
2094
2095 - enums are not checked as gcc __builtin_types_compatible_p ()
2096 */
2097 static int compare_types(CType *type1, CType *type2, int unqualified)
2098 {
2099 int bt1, t1, t2;
2100
2101 t1 = type1->t & VT_TYPE;
2102 t2 = type2->t & VT_TYPE;
2103 if (unqualified) {
2104 /* strip qualifiers before comparing */
2105 t1 &= ~(VT_CONSTANT | VT_VOLATILE);
2106 t2 &= ~(VT_CONSTANT | VT_VOLATILE);
2107 }
2108 /* XXX: bitfields ? */
2109 if (t1 != t2)
2110 return 0;
2111 /* test more complicated cases */
2112 bt1 = t1 & VT_BTYPE;
2113 if (bt1 == VT_PTR) {
2114 type1 = pointed_type(type1);
2115 type2 = pointed_type(type2);
2116 return is_compatible_types(type1, type2);
2117 } else if (bt1 == VT_STRUCT) {
2118 return (type1->ref == type2->ref);
2119 } else if (bt1 == VT_FUNC) {
2120 return is_compatible_func(type1, type2);
2121 } else {
2122 return 1;
2123 }
2124 }
2125
2126 /* return true if type1 and type2 are exactly the same (including
2127 qualifiers).
2128 */
2129 static int is_compatible_types(CType *type1, CType *type2)
2130 {
2131 return compare_types(type1,type2,0);
2132 }
2133
2134 /* return true if type1 and type2 are the same (ignoring qualifiers).
2135 */
2136 static int is_compatible_parameter_types(CType *type1, CType *type2)
2137 {
2138 return compare_types(type1,type2,1);
2139 }
2140
2141 /* print a type. If 'varstr' is not NULL, then the variable is also
2142 printed in the type */
2143 /* XXX: union */
2144 /* XXX: add array and function pointers */
2145 static void type_to_str(char *buf, int buf_size,
2146 CType *type, const char *varstr)
2147 {
2148 int bt, v, t;
2149 Sym *s, *sa;
2150 char buf1[256];
2151 const char *tstr;
2152
2153 t = type->t & VT_TYPE;
2154 bt = t & VT_BTYPE;
2155 buf[0] = '\0';
2156 if (t & VT_CONSTANT)
2157 pstrcat(buf, buf_size, "const ");
2158 if (t & VT_VOLATILE)
2159 pstrcat(buf, buf_size, "volatile ");
2160 if (t & VT_UNSIGNED)
2161 pstrcat(buf, buf_size, "unsigned ");
2162 switch(bt) {
2163 case VT_VOID:
2164 tstr = "void";
2165 goto add_tstr;
2166 case VT_BOOL:
2167 tstr = "_Bool";
2168 goto add_tstr;
2169 case VT_BYTE:
2170 tstr = "char";
2171 goto add_tstr;
2172 case VT_SHORT:
2173 tstr = "short";
2174 goto add_tstr;
2175 case VT_INT:
2176 tstr = "int";
2177 goto add_tstr;
2178 case VT_LONG:
2179 tstr = "long";
2180 goto add_tstr;
2181 case VT_LLONG:
2182 tstr = "long long";
2183 goto add_tstr;
2184 case VT_FLOAT:
2185 tstr = "float";
2186 goto add_tstr;
2187 case VT_DOUBLE:
2188 tstr = "double";
2189 goto add_tstr;
2190 case VT_LDOUBLE:
2191 tstr = "long double";
2192 add_tstr:
2193 pstrcat(buf, buf_size, tstr);
2194 break;
2195 case VT_ENUM:
2196 case VT_STRUCT:
2197 if (bt == VT_STRUCT)
2198 tstr = "struct ";
2199 else
2200 tstr = "enum ";
2201 pstrcat(buf, buf_size, tstr);
2202 v = type->ref->v & ~SYM_STRUCT;
2203 if (v >= SYM_FIRST_ANOM)
2204 pstrcat(buf, buf_size, "<anonymous>");
2205 else
2206 pstrcat(buf, buf_size, get_tok_str(v, NULL));
2207 break;
2208 case VT_FUNC:
2209 s = type->ref;
2210 type_to_str(buf, buf_size, &s->type, varstr);
2211 pstrcat(buf, buf_size, "(");
2212 sa = s->next;
2213 while (sa != NULL) {
2214 type_to_str(buf1, sizeof(buf1), &sa->type, NULL);
2215 pstrcat(buf, buf_size, buf1);
2216 sa = sa->next;
2217 if (sa)
2218 pstrcat(buf, buf_size, ", ");
2219 }
2220 pstrcat(buf, buf_size, ")");
2221 goto no_var;
2222 case VT_PTR:
2223 s = type->ref;
2224 pstrcpy(buf1, sizeof(buf1), "*");
2225 if (varstr)
2226 pstrcat(buf1, sizeof(buf1), varstr);
2227 type_to_str(buf, buf_size, &s->type, buf1);
2228 goto no_var;
2229 }
2230 if (varstr) {
2231 pstrcat(buf, buf_size, " ");
2232 pstrcat(buf, buf_size, varstr);
2233 }
2234 no_var: ;
2235 }
2236
2237 /* verify type compatibility to store vtop in 'dt' type, and generate
2238 casts if needed. */
2239 static void gen_assign_cast(CType *dt)
2240 {
2241 CType *st, *type1, *type2, tmp_type1, tmp_type2;
2242 char buf1[256], buf2[256];
2243 int dbt, sbt;
2244
2245 st = &vtop->type; /* source type */
2246 dbt = dt->t & VT_BTYPE;
2247 sbt = st->t & VT_BTYPE;
2248 if (dt->t & VT_CONSTANT)
2249 warning("assignment of read-only location");
2250 switch(dbt) {
2251 case VT_PTR:
2252 /* special cases for pointers */
2253 /* '0' can also be a pointer */
2254 if (is_null_pointer(vtop))
2255 goto type_ok;
2256 /* accept implicit pointer to integer cast with warning */
2257 if (is_integer_btype(sbt)) {
2258 warning("assignment makes pointer from integer without a cast");
2259 goto type_ok;
2260 }
2261 type1 = pointed_type(dt);
2262 /* a function is implicitely a function pointer */
2263 if (sbt == VT_FUNC) {
2264 if ((type1->t & VT_BTYPE) != VT_VOID &&
2265 !is_compatible_types(pointed_type(dt), st))
2266 warning("assignment from incompatible pointer type");
2267 goto type_ok;
2268 }
2269 if (sbt != VT_PTR)
2270 goto error;
2271 type2 = pointed_type(st);
2272 if ((type1->t & VT_BTYPE) == VT_VOID ||
2273 (type2->t & VT_BTYPE) == VT_VOID) {
2274 /* void * can match anything */
2275 } else {
2276 /* exact type match, except for unsigned */
2277 tmp_type1 = *type1;
2278 tmp_type2 = *type2;
2279 tmp_type1.t &= ~(VT_UNSIGNED | VT_CONSTANT | VT_VOLATILE);
2280 tmp_type2.t &= ~(VT_UNSIGNED | VT_CONSTANT | VT_VOLATILE);
2281 if (!is_compatible_types(&tmp_type1, &tmp_type2))
2282 warning("assignment from incompatible pointer type");
2283 }
2284 /* check const and volatile */
2285 if ((!(type1->t & VT_CONSTANT) && (type2->t & VT_CONSTANT)) ||
2286 (!(type1->t & VT_VOLATILE) && (type2->t & VT_VOLATILE)))
2287 warning("assignment discards qualifiers from pointer target type");
2288 break;
2289 case VT_BYTE:
2290 case VT_SHORT:
2291 case VT_INT:
2292 case VT_LLONG:
2293 if (sbt == VT_PTR || sbt == VT_FUNC) {
2294 warning("assignment makes integer from pointer without a cast");
2295 }
2296 /* XXX: more tests */
2297 break;
2298 case VT_STRUCT:
2299 tmp_type1 = *dt;
2300 tmp_type2 = *st;
2301 tmp_type1.t &= ~(VT_CONSTANT | VT_VOLATILE);
2302 tmp_type2.t &= ~(VT_CONSTANT | VT_VOLATILE);
2303 if (!is_compatible_types(&tmp_type1, &tmp_type2)) {
2304 error:
2305 type_to_str(buf1, sizeof(buf1), st, NULL);
2306 type_to_str(buf2, sizeof(buf2), dt, NULL);
2307 error("cannot cast '%s' to '%s'", buf1, buf2);
2308 }
2309 break;
2310 }
2311 type_ok:
2312 gen_cast(dt);
2313 }
2314
2315 /* store vtop in lvalue pushed on stack */
2316 ST_FUNC void vstore(void)
2317 {
2318 int sbt, dbt, ft, r, t, size, align, bit_size, bit_pos, rc, delayed_cast;
2319
2320 ft = vtop[-1].type.t;
2321 sbt = vtop->type.t & VT_BTYPE;
2322 dbt = ft & VT_BTYPE;
2323 if (((sbt == VT_INT || sbt == VT_SHORT) && dbt == VT_BYTE) ||
2324 (sbt == VT_INT && dbt == VT_SHORT)) {
2325 /* optimize char/short casts */
2326 delayed_cast = VT_MUSTCAST;
2327 vtop->type.t = ft & (VT_TYPE & ~(VT_BITFIELD | (-1 << VT_STRUCT_SHIFT)));
2328 /* XXX: factorize */
2329 if (ft & VT_CONSTANT)
2330 warning("assignment of read-only location");
2331 } else {
2332 delayed_cast = 0;
2333 if (!(ft & VT_BITFIELD))
2334 gen_assign_cast(&vtop[-1].type);
2335 }
2336
2337 if (sbt == VT_STRUCT) {
2338 /* if structure, only generate pointer */
2339 /* structure assignment : generate memcpy */
2340 /* XXX: optimize if small size */
2341 if (!nocode_wanted) {
2342 size = type_size(&vtop->type, &align);
2343
2344 /* destination */
2345 vswap();
2346 vtop->type.t = VT_PTR;
2347 gaddrof();
2348
2349 /* address of memcpy() */
2350 #ifdef TCC_ARM_EABI
2351 if(!(align & 7))
2352 vpush_global_sym(&func_old_type, TOK_memcpy8);
2353 else if(!(align & 3))
2354 vpush_global_sym(&func_old_type, TOK_memcpy4);
2355 else
2356 #endif
2357 vpush_global_sym(&func_old_type, TOK_memcpy);
2358
2359 vswap();
2360 /* source */
2361 vpushv(vtop - 2);
2362 vtop->type.t = VT_PTR;
2363 gaddrof();
2364 /* type size */
2365 vpushi(size);
2366 gfunc_call(3);
2367 } else {
2368 vswap();
2369 vpop();
2370 }
2371 /* leave source on stack */
2372 } else if (ft & VT_BITFIELD) {
2373 /* bitfield store handling */
2374 bit_pos = (ft >> VT_STRUCT_SHIFT) & 0x3f;
2375 bit_size = (ft >> (VT_STRUCT_SHIFT + 6)) & 0x3f;
2376 /* remove bit field info to avoid loops */
2377 vtop[-1].type.t = ft & ~(VT_BITFIELD | (-1 << VT_STRUCT_SHIFT));
2378
2379 /* duplicate source into other register */
2380 gv_dup();
2381 vswap();
2382 vrott(3);
2383
2384 if((ft & VT_BTYPE) == VT_BOOL) {
2385 gen_cast(&vtop[-1].type);
2386 vtop[-1].type.t = (vtop[-1].type.t & ~VT_BTYPE) | (VT_BYTE | VT_UNSIGNED);
2387 }
2388
2389 /* duplicate destination */
2390 vdup();
2391 vtop[-1] = vtop[-2];
2392
2393 /* mask and shift source */
2394 if((ft & VT_BTYPE) != VT_BOOL) {
2395 if((ft & VT_BTYPE) == VT_LLONG) {
2396 vpushll((1ULL << bit_size) - 1ULL);
2397 } else {
2398 vpushi((1 << bit_size) - 1);
2399 }
2400 gen_op('&');
2401 }
2402 vpushi(bit_pos);
2403 gen_op(TOK_SHL);
2404 /* load destination, mask and or with source */
2405 vswap();
2406 if((ft & VT_BTYPE) == VT_LLONG) {
2407 vpushll(~(((1ULL << bit_size) - 1ULL) << bit_pos));
2408 } else {
2409 vpushi(~(((1 << bit_size) - 1) << bit_pos));
2410 }
2411 gen_op('&');
2412 gen_op('|');
2413 /* store result */
2414 vstore();
2415
2416 /* pop off shifted source from "duplicate source..." above */
2417 vpop();
2418
2419 } else {
2420 #ifdef CONFIG_TCC_BCHECK
2421 /* bound check case */
2422 if (vtop[-1].r & VT_MUSTBOUND) {
2423 vswap();
2424 gbound();
2425 vswap();
2426 }
2427 #endif
2428 if (!nocode_wanted) {
2429 rc = RC_INT;
2430 if (is_float(ft)) {
2431 rc = RC_FLOAT;
2432 #ifdef TCC_TARGET_X86_64
2433 if ((ft & VT_BTYPE) == VT_LDOUBLE) {
2434 rc = RC_ST0;
2435 }
2436 #endif
2437 }
2438 r = gv(rc); /* generate value */
2439 /* if lvalue was saved on stack, must read it */
2440 if ((vtop[-1].r & VT_VALMASK) == VT_LLOCAL) {
2441 SValue sv;
2442 t = get_reg(RC_INT);
2443 #ifdef TCC_TARGET_X86_64
2444 sv.type.t = VT_PTR;
2445 #else
2446 sv.type.t = VT_INT;
2447 #endif
2448 sv.r = VT_LOCAL | VT_LVAL;
2449 sv.c.ul = vtop[-1].c.ul;
2450 load(t, &sv);
2451 vtop[-1].r = t | VT_LVAL;
2452 }
2453 store(r, vtop - 1);
2454 #ifndef TCC_TARGET_X86_64
2455 /* two word case handling : store second register at word + 4 */
2456 if ((ft & VT_BTYPE) == VT_LLONG) {
2457 vswap();
2458 /* convert to int to increment easily */
2459 vtop->type.t = VT_INT;
2460 gaddrof();
2461 vpushi(4);
2462 gen_op('+');
2463 vtop->r |= VT_LVAL;
2464 vswap();
2465 /* XXX: it works because r2 is spilled last ! */
2466 store(vtop->r2, vtop - 1);
2467 }
2468 #endif
2469 }
2470 vswap();
2471 vtop--; /* NOT vpop() because on x86 it would flush the fp stack */
2472 vtop->r |= delayed_cast;
2473 }
2474 }
2475
2476 /* post defines POST/PRE add. c is the token ++ or -- */
2477 ST_FUNC void inc(int post, int c)
2478 {
2479 test_lvalue();
2480 vdup(); /* save lvalue */
2481 if (post) {
2482 gv_dup(); /* duplicate value */
2483 vrotb(3);
2484 vrotb(3);
2485 }
2486 /* add constant */
2487 vpushi(c - TOK_MID);
2488 gen_op('+');
2489 vstore(); /* store value */
2490 if (post)
2491 vpop(); /* if post op, return saved value */
2492 }
2493
2494 /* Parse GNUC __attribute__ extension. Currently, the following
2495 extensions are recognized:
2496 - aligned(n) : set data/function alignment.
2497 - packed : force data alignment to 1
2498 - section(x) : generate data/code in this section.
2499 - unused : currently ignored, but may be used someday.
2500 - regparm(n) : pass function parameters in registers (i386 only)
2501 */
2502 static void parse_attribute(AttributeDef *ad)
2503 {
2504 int t, n;
2505
2506 while (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2) {
2507 next();
2508 skip('(');
2509 skip('(');
2510 while (tok != ')') {
2511 if (tok < TOK_IDENT)
2512 expect("attribute name");
2513 t = tok;
2514 next();
2515 switch(t) {
2516 case TOK_SECTION1:
2517 case TOK_SECTION2:
2518 skip('(');
2519 if (tok != TOK_STR)
2520 expect("section name");
2521 ad->section = find_section(tcc_state, (char *)tokc.cstr->data);
2522 next();
2523 skip(')');
2524 break;
2525 case TOK_ALIAS1:
2526 case TOK_ALIAS2:
2527 skip('(');
2528 if (tok != TOK_STR)
2529 expect("alias(\"target\")");
2530 ad->alias_target = /* save string as token, for later */
2531 tok_alloc((char*)tokc.cstr->data, tokc.cstr->size-1)->tok;
2532 next();
2533 skip(')');
2534 break;
2535 case TOK_ALIGNED1:
2536 case TOK_ALIGNED2:
2537 if (tok == '(') {
2538 next();
2539 n = expr_const();
2540 if (n <= 0 || (n & (n - 1)) != 0)
2541 error("alignment must be a positive power of two");
2542 skip(')');
2543 } else {
2544 n = MAX_ALIGN;
2545 }
2546 ad->aligned = n;
2547 break;
2548 case TOK_PACKED1:
2549 case TOK_PACKED2:
2550 ad->packed = 1;
2551 break;
2552 case TOK_WEAK1:
2553 case TOK_WEAK2:
2554 ad->weak = 1;
2555 break;
2556 case TOK_UNUSED1:
2557 case TOK_UNUSED2:
2558 /* currently, no need to handle it because tcc does not
2559 track unused objects */
2560 break;
2561 case TOK_NORETURN1:
2562 case TOK_NORETURN2:
2563 /* currently, no need to handle it because tcc does not
2564 track unused objects */
2565 break;
2566 case TOK_CDECL1:
2567 case TOK_CDECL2:
2568 case TOK_CDECL3:
2569 ad->func_call = FUNC_CDECL;
2570 break;
2571 case TOK_STDCALL1:
2572 case TOK_STDCALL2:
2573 case TOK_STDCALL3:
2574 ad->func_call = FUNC_STDCALL;
2575 break;
2576 #ifdef TCC_TARGET_I386
2577 case TOK_REGPARM1:
2578 case TOK_REGPARM2:
2579 skip('(');
2580 n = expr_const();
2581 if (n > 3)
2582 n = 3;
2583 else if (n < 0)
2584 n = 0;
2585 if (n > 0)
2586 ad->func_call = FUNC_FASTCALL1 + n - 1;
2587 skip(')');
2588 break;
2589 case TOK_FASTCALL1:
2590 case TOK_FASTCALL2:
2591 case TOK_FASTCALL3:
2592 ad->func_call = FUNC_FASTCALLW;
2593 break;
2594 #endif
2595 case TOK_MODE:
2596 skip('(');
2597 switch(tok) {
2598 case TOK_MODE_DI:
2599 ad->mode = VT_LLONG + 1;
2600 break;
2601 case TOK_MODE_HI:
2602 ad->mode = VT_SHORT + 1;
2603 break;
2604 case TOK_MODE_SI:
2605 ad->mode = VT_INT + 1;
2606 break;
2607 default:
2608 warning("__mode__(%s) not supported\n", get_tok_str(tok, NULL));
2609 break;
2610 }
2611 next();
2612 skip(')');
2613 break;
2614 case TOK_DLLEXPORT:
2615 ad->func_export = 1;
2616 break;
2617 case TOK_DLLIMPORT:
2618 ad->func_import = 1;
2619 break;
2620 default:
2621 if (tcc_state->warn_unsupported)
2622 warning("'%s' attribute ignored", get_tok_str(t, NULL));
2623 /* skip parameters */
2624 if (tok == '(') {
2625 int parenthesis = 0;
2626 do {
2627 if (tok == '(')
2628 parenthesis++;
2629 else if (tok == ')')
2630 parenthesis--;
2631 next();
2632 } while (parenthesis && tok != -1);
2633 }
2634 break;
2635 }
2636 if (tok != ',')
2637 break;
2638 next();
2639 }
2640 skip(')');
2641 skip(')');
2642 }
2643 }
2644
2645 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
2646 static void struct_decl(CType *type, int u)
2647 {
2648 int a, v, size, align, maxalign, c, offset;
2649 int bit_size, bit_pos, bsize, bt, lbit_pos, prevbt;
2650 Sym *s, *ss, *ass, **ps;
2651 AttributeDef ad;
2652 CType type1, btype;
2653
2654 a = tok; /* save decl type */
2655 next();
2656 if (tok != '{') {
2657 v = tok;
2658 next();
2659 /* struct already defined ? return it */
2660 if (v < TOK_IDENT)
2661 expect("struct/union/enum name");
2662 s = struct_find(v);
2663 if (s) {
2664 if (s->type.t != a)
2665 error("invalid type");
2666 goto do_decl;
2667 }
2668 } else {
2669 v = anon_sym++;
2670 }
2671 type1.t = a;
2672 /* we put an undefined size for struct/union */
2673 s = sym_push(v | SYM_STRUCT, &type1, 0, -1);
2674 s->r = 0; /* default alignment is zero as gcc */
2675 /* put struct/union/enum name in type */
2676 do_decl:
2677 type->t = u;
2678 type->ref = s;
2679
2680 if (tok == '{') {
2681 next();
2682 if (s->c != -1)
2683 error("struct/union/enum already defined");
2684 /* cannot be empty */
2685 c = 0;
2686 /* non empty enums are not allowed */
2687 if (a == TOK_ENUM) {
2688 for(;;) {
2689 v = tok;
2690 if (v < TOK_UIDENT)
2691 expect("identifier");
2692 next();
2693 if (tok == '=') {
2694 next();
2695 c = expr_const();
2696 }
2697 /* enum symbols have static storage */
2698 ss = sym_push(v, &int_type, VT_CONST, c);
2699 ss->type.t |= VT_STATIC;
2700 if (tok != ',')
2701 break;
2702 next();
2703 c++;
2704 /* NOTE: we accept a trailing comma */
2705 if (tok == '}')
2706 break;
2707 }
2708 skip('}');
2709 } else {
2710 maxalign = 1;
2711 ps = &s->next;
2712 prevbt = VT_INT;
2713 bit_pos = 0;
2714 offset = 0;
2715 while (tok != '}') {
2716 parse_btype(&btype, &ad);
2717 while (1) {
2718 bit_size = -1;
2719 v = 0;
2720 type1 = btype;
2721 if (tok != ':') {
2722 type_decl(&type1, &ad, &v, TYPE_DIRECT | TYPE_ABSTRACT);
2723 if (v == 0 && (type1.t & VT_BTYPE) != VT_STRUCT)
2724 expect("identifier");
2725 if ((type1.t & VT_BTYPE) == VT_FUNC ||
2726 (type1.t & (VT_TYPEDEF | VT_STATIC | VT_EXTERN | VT_INLINE)))
2727 error("invalid type for '%s'",
2728 get_tok_str(v, NULL));
2729 }
2730 if (tok == ':') {
2731 next();
2732 bit_size = expr_const();
2733 /* XXX: handle v = 0 case for messages */
2734 if (bit_size < 0)
2735 error("negative width in bit-field '%s'",
2736 get_tok_str(v, NULL));
2737 if (v && bit_size == 0)
2738 error("zero width for bit-field '%s'",
2739 get_tok_str(v, NULL));
2740 }
2741 size = type_size(&type1, &align);
2742 if (ad.aligned) {
2743 if (align < ad.aligned)
2744 align = ad.aligned;
2745 } else if (ad.packed) {
2746 align = 1;
2747 } else if (*tcc_state->pack_stack_ptr) {
2748 if (align > *tcc_state->pack_stack_ptr)
2749 align = *tcc_state->pack_stack_ptr;
2750 }
2751 lbit_pos = 0;
2752 if (bit_size >= 0) {
2753 bt = type1.t & VT_BTYPE;
2754 if (bt != VT_INT &&
2755 bt != VT_BYTE &&
2756 bt != VT_SHORT &&
2757 bt != VT_BOOL &&
2758 bt != VT_ENUM &&
2759 bt != VT_LLONG)
2760 error("bitfields must have scalar type");
2761 bsize = size * 8;
2762 if (bit_size > bsize) {
2763 error("width of '%s' exceeds its type",
2764 get_tok_str(v, NULL));
2765 } else if (bit_size == bsize) {
2766 /* no need for bit fields */
2767 bit_pos = 0;
2768 } else if (bit_size == 0) {
2769 /* XXX: what to do if only padding in a
2770 structure ? */
2771 /* zero size: means to pad */
2772 bit_pos = 0;
2773 } else {
2774 /* we do not have enough room ?
2775 did the type change?
2776 is it a union? */
2777 if ((bit_pos + bit_size) > bsize ||
2778 bt != prevbt || a == TOK_UNION)
2779 bit_pos = 0;
2780 lbit_pos = bit_pos;
2781 /* XXX: handle LSB first */
2782 type1.t |= VT_BITFIELD |
2783 (bit_pos << VT_STRUCT_SHIFT) |
2784 (bit_size << (VT_STRUCT_SHIFT + 6));
2785 bit_pos += bit_size;
2786 }
2787 prevbt = bt;
2788 } else {
2789 bit_pos = 0;
2790 }
2791 if (v != 0 || (type1.t & VT_BTYPE) == VT_STRUCT) {
2792 /* add new memory data only if starting
2793 bit field */
2794 if (lbit_pos == 0) {
2795 if (a == TOK_STRUCT) {
2796 c = (c + align - 1) & -align;
2797 offset = c;
2798 if (size > 0)
2799 c += size;
2800 } else {
2801 offset = 0;
2802 if (size > c)
2803 c = size;
2804 }
2805 if (align > maxalign)
2806 maxalign = align;
2807 }
2808 #if 0
2809 printf("add field %s offset=%d",
2810 get_tok_str(v, NULL), offset);
2811 if (type1.t & VT_BITFIELD) {
2812 printf(" pos=%d size=%d",
2813 (type1.t >> VT_STRUCT_SHIFT) & 0x3f,
2814 (type1.t >> (VT_STRUCT_SHIFT + 6)) & 0x3f);
2815 }
2816 printf("\n");
2817 #endif
2818 }
2819 if (v == 0 && (type1.t & VT_BTYPE) == VT_STRUCT) {
2820 ass = type1.ref;
2821 while ((ass = ass->next) != NULL) {
2822 ss = sym_push(ass->v, &ass->type, 0, offset + ass->c);
2823 *ps = ss;
2824 ps = &ss->next;
2825 }
2826 } else if (v) {
2827 ss = sym_push(v | SYM_FIELD, &type1, 0, offset);
2828 *ps = ss;
2829 ps = &ss->next;
2830 }
2831 if (tok == ';' || tok == TOK_EOF)
2832 break;
2833 skip(',');
2834 }
2835 skip(';');
2836 }
2837 skip('}');
2838 /* store size and alignment */
2839 s->c = (c + maxalign - 1) & -maxalign;
2840 s->r = maxalign;
2841 }
2842 }
2843 }
2844
2845 /* return 0 if no type declaration. otherwise, return the basic type
2846 and skip it.
2847 */
2848 static int parse_btype(CType *type, AttributeDef *ad)
2849 {
2850 int t, u, type_found, typespec_found, typedef_found;
2851 Sym *s;
2852 CType type1;
2853
2854 memset(ad, 0, sizeof(AttributeDef));
2855 type_found = 0;
2856 typespec_found = 0;
2857 typedef_found = 0;
2858 t = 0;
2859 while(1) {
2860 switch(tok) {
2861 case TOK_EXTENSION:
2862 /* currently, we really ignore extension */
2863 next();
2864 continue;
2865
2866 /* basic types */
2867 case TOK_CHAR:
2868 u = VT_BYTE;
2869 basic_type:
2870 next();
2871 basic_type1:
2872 if ((t & VT_BTYPE) != 0)
2873 error("too many basic types");
2874 t |= u;
2875 typespec_found = 1;
2876 break;
2877 case TOK_VOID:
2878 u = VT_VOID;
2879 goto basic_type;
2880 case TOK_SHORT:
2881 u = VT_SHORT;
2882 goto basic_type;
2883 case TOK_INT:
2884 next();
2885 typespec_found = 1;
2886 break;
2887 case TOK_LONG:
2888 next();
2889 if ((t & VT_BTYPE) == VT_DOUBLE) {
2890 #ifndef TCC_TARGET_PE
2891 t = (t & ~VT_BTYPE) | VT_LDOUBLE;
2892 #endif
2893 } else if ((t & VT_BTYPE) == VT_LONG) {
2894 t = (t & ~VT_BTYPE) | VT_LLONG;
2895 } else {
2896 u = VT_LONG;
2897 goto basic_type1;
2898 }
2899 break;
2900 case TOK_BOOL:
2901 u = VT_BOOL;
2902 goto basic_type;
2903 case TOK_FLOAT:
2904 u = VT_FLOAT;
2905 goto basic_type;
2906 case TOK_DOUBLE:
2907 next();
2908 if ((t & VT_BTYPE) == VT_LONG) {
2909 #ifdef TCC_TARGET_PE
2910 t = (t & ~VT_BTYPE) | VT_DOUBLE;
2911 #else
2912 t = (t & ~VT_BTYPE) | VT_LDOUBLE;
2913 #endif
2914 } else {
2915 u = VT_DOUBLE;
2916 goto basic_type1;
2917 }
2918 break;
2919 case TOK_ENUM:
2920 struct_decl(&type1, VT_ENUM);
2921 basic_type2:
2922 u = type1.t;
2923 type->ref = type1.ref;
2924 goto basic_type1;
2925 case TOK_STRUCT:
2926 case TOK_UNION:
2927 struct_decl(&type1, VT_STRUCT);
2928 goto basic_type2;
2929
2930 /* type modifiers */
2931 case TOK_CONST1:
2932 case TOK_CONST2:
2933 case TOK_CONST3:
2934 t |= VT_CONSTANT;
2935 next();
2936 break;
2937 case TOK_VOLATILE1:
2938 case TOK_VOLATILE2:
2939 case TOK_VOLATILE3:
2940 t |= VT_VOLATILE;
2941 next();
2942 break;
2943 case TOK_SIGNED1:
2944 case TOK_SIGNED2:
2945 case TOK_SIGNED3:
2946 typespec_found = 1;
2947 t |= VT_SIGNED;
2948 next();
2949 break;
2950 case TOK_REGISTER:
2951 case TOK_AUTO:
2952 case TOK_RESTRICT1:
2953 case TOK_RESTRICT2:
2954 case TOK_RESTRICT3:
2955 next();
2956 break;
2957 case TOK_UNSIGNED:
2958 t |= VT_UNSIGNED;
2959 next();
2960 typespec_found = 1;
2961 break;
2962
2963 /* storage */
2964 case TOK_EXTERN:
2965 t |= VT_EXTERN;
2966 next();
2967 break;
2968 case TOK_STATIC:
2969 t |= VT_STATIC;
2970 next();
2971 break;
2972 case TOK_TYPEDEF:
2973 t |= VT_TYPEDEF;
2974 next();
2975 break;
2976 case TOK_INLINE1:
2977 case TOK_INLINE2:
2978 case TOK_INLINE3:
2979 t |= VT_INLINE;
2980 next();
2981 break;
2982
2983 /* GNUC attribute */
2984 case TOK_ATTRIBUTE1:
2985 case TOK_ATTRIBUTE2:
2986 parse_attribute(ad);
2987 if (ad->mode) {
2988 u = ad->mode -1;
2989 t = (t & ~VT_BTYPE) | u;
2990 }
2991 break;
2992 /* GNUC typeof */
2993 case TOK_TYPEOF1:
2994 case TOK_TYPEOF2:
2995 case TOK_TYPEOF3:
2996 next();
2997 parse_expr_type(&type1);
2998 /* remove all storage modifiers except typedef */
2999 type1.t &= ~(VT_STORAGE&~VT_TYPEDEF);
3000 goto basic_type2;
3001 default:
3002 if (typespec_found || typedef_found)
3003 goto the_end;
3004 s = sym_find(tok);
3005 if (!s || !(s->type.t & VT_TYPEDEF))
3006 goto the_end;
3007 typedef_found = 1;
3008 t |= (s->type.t & ~VT_TYPEDEF);
3009 type->ref = s->type.ref;
3010 if (s->r) {
3011 /* get attributes from typedef */
3012 if (0 == ad->aligned)
3013 ad->aligned = FUNC_ALIGN(s->r);
3014 if (0 == ad->func_call)
3015 ad->func_call = FUNC_CALL(s->r);
3016 ad->packed |= FUNC_PACKED(s->r);
3017 }
3018 next();
3019 typespec_found = 1;
3020 break;
3021 }
3022 type_found = 1;
3023 }
3024 the_end:
3025 if ((t & (VT_SIGNED|VT_UNSIGNED)) == (VT_SIGNED|VT_UNSIGNED))
3026 error("signed and unsigned modifier");
3027 if (tcc_state->char_is_unsigned) {
3028 if ((t & (VT_SIGNED|VT_UNSIGNED|VT_BTYPE)) == VT_BYTE)
3029 t |= VT_UNSIGNED;
3030 }
3031 t &= ~VT_SIGNED;
3032
3033 /* long is never used as type */
3034 if ((t & VT_BTYPE) == VT_LONG)
3035 #if !defined TCC_TARGET_X86_64 || defined TCC_TARGET_PE
3036 t = (t & ~VT_BTYPE) | VT_INT;
3037 #else
3038 t = (t & ~VT_BTYPE) | VT_LLONG;
3039 #endif
3040 type->t = t;
3041 return type_found;
3042 }
3043
3044 /* convert a function parameter type (array to pointer and function to
3045 function pointer) */
3046 static inline void convert_parameter_type(CType *pt)
3047 {
3048 /* remove const and volatile qualifiers (XXX: const could be used
3049 to indicate a const function parameter */
3050 pt->t &= ~(VT_CONSTANT | VT_VOLATILE);
3051 /* array must be transformed to pointer according to ANSI C */
3052 pt->t &= ~VT_ARRAY;
3053 if ((pt->t & VT_BTYPE) == VT_FUNC) {
3054 mk_pointer(pt);
3055 }
3056 }
3057
3058 ST_FUNC void parse_asm_str(CString *astr)
3059 {
3060 skip('(');
3061 /* read the string */
3062 if (tok != TOK_STR)
3063 expect("string constant");
3064 cstr_new(astr);
3065 while (tok == TOK_STR) {
3066 /* XXX: add \0 handling too ? */
3067 cstr_cat(astr, tokc.cstr->data);
3068 next();
3069 }
3070 cstr_ccat(astr, '\0');
3071 }
3072
3073 /* Parse an asm label and return the label
3074 * Don't forget to free the CString in the caller! */
3075 static void asm_label_instr(CString *astr)
3076 {
3077 next();
3078 parse_asm_str(astr);
3079 skip(')');
3080 #ifdef ASM_DEBUG
3081 printf("asm_alias: \"%s\"\n", (char *)astr->data);
3082 #endif
3083 }
3084
3085 static void post_type(CType *type, AttributeDef *ad)
3086 {
3087 int n, l, t1, arg_size, align;
3088 Sym **plast, *s, *first;
3089 AttributeDef ad1;
3090 CType pt;
3091
3092 if (tok == '(') {
3093 /* function declaration */
3094 next();
3095 l = 0;
3096 first = NULL;
3097 plast = &first;
3098 arg_size = 0;
3099 if (tok != ')') {
3100 for(;;) {
3101 /* read param name and compute offset */
3102 if (l != FUNC_OLD) {
3103 if (!parse_btype(&pt, &ad1)) {
3104 if (l) {
3105 error("invalid type");
3106 } else {
3107 l = FUNC_OLD;
3108 goto old_proto;
3109 }
3110 }
3111 l = FUNC_NEW;
3112 if ((pt.t & VT_BTYPE) == VT_VOID && tok == ')')
3113 break;
3114 type_decl(&pt, &ad1, &n, TYPE_DIRECT | TYPE_ABSTRACT);
3115 if ((pt.t & VT_BTYPE) == VT_VOID)
3116 error("parameter declared as void");
3117 arg_size += (type_size(&pt, &align) + PTR_SIZE - 1) / PTR_SIZE;
3118 } else {
3119 old_proto:
3120 n = tok;
3121 if (n < TOK_UIDENT)
3122 expect("identifier");
3123 pt.t = VT_INT;
3124 next();
3125 }
3126 convert_parameter_type(&pt);
3127 s = sym_push(n | SYM_FIELD, &pt, 0, 0);
3128 *plast = s;
3129 plast = &s->next;
3130 if (tok == ')')
3131 break;
3132 skip(',');
3133 if (l == FUNC_NEW && tok == TOK_DOTS) {
3134 l = FUNC_ELLIPSIS;
3135 next();
3136 break;
3137 }
3138 }
3139 }
3140 /* if no parameters, then old type prototype */
3141 if (l == 0)
3142 l = FUNC_OLD;
3143 skip(')');
3144 /* NOTE: const is ignored in returned type as it has a special
3145 meaning in gcc / C++ */
3146 type->t &= ~VT_CONSTANT;
3147 /* some ancient pre-K&R C allows a function to return an array
3148 and the array brackets to be put after the arguments, such
3149 that "int c()[]" means something like "int[] c()" */
3150 if (tok == '[') {
3151 next();
3152 skip(']'); /* only handle simple "[]" */
3153 type->t |= VT_PTR;
3154 }
3155 /* we push a anonymous symbol which will contain the function prototype */
3156 ad->func_args = arg_size;
3157 s = sym_push(SYM_FIELD, type, INT_ATTR(ad), l);
3158 s->next = first;
3159 type->t = VT_FUNC;
3160 type->ref = s;
3161 } else if (tok == '[') {
3162 /* array definition */
3163 next();
3164 if (tok == TOK_RESTRICT1)
3165 next();
3166 n = -1;
3167 t1 = 0;
3168 if (tok != ']') {
3169 if (!local_stack || nocode_wanted)
3170 vpushi(expr_const());
3171 else gexpr();
3172 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
3173 n = vtop->c.i;
3174 if (n < 0)
3175 error("invalid array size");
3176 } else {
3177 if (!is_integer_btype(vtop->type.t & VT_BTYPE))
3178 error("size of variable length array should be an integer");
3179 t1 = VT_VLA;
3180 }
3181 }
3182 skip(']');
3183 /* parse next post type */
3184 post_type(type, ad);
3185 t1 |= type->t & VT_VLA;
3186
3187 if (t1 & VT_VLA) {
3188 loc -= type_size(&int_type, &align);
3189 loc &= -align;
3190 n = loc;
3191
3192 vla_runtime_type_size(type, &align);
3193 gen_op('*');
3194 vset(&int_type, VT_LOCAL|VT_LVAL, loc);
3195 vswap();
3196 vstore();
3197 }
3198 if (n != -1)
3199 vpop();
3200
3201 /* we push an anonymous symbol which will contain the array
3202 element type */
3203 s = sym_push(SYM_FIELD, type, 0, n);
3204 type->t = (t1 ? VT_VLA : VT_ARRAY) | VT_PTR;
3205 type->ref = s;
3206 }
3207 }
3208
3209 /* Parse a type declaration (except basic type), and return the type
3210 in 'type'. 'td' is a bitmask indicating which kind of type decl is
3211 expected. 'type' should contain the basic type. 'ad' is the
3212 attribute definition of the basic type. It can be modified by
3213 type_decl().
3214 */
3215 static void type_decl(CType *type, AttributeDef *ad, int *v, int td)
3216 {
3217 Sym *s;
3218 CType type1, *type2;
3219 int qualifiers, storage;
3220
3221 while (tok == '*') {
3222 qualifiers = 0;
3223 redo:
3224 next();
3225 switch(tok) {
3226 case TOK_CONST1:
3227 case TOK_CONST2:
3228 case TOK_CONST3:
3229 qualifiers |= VT_CONSTANT;
3230 goto redo;
3231 case TOK_VOLATILE1:
3232 case TOK_VOLATILE2:
3233 case TOK_VOLATILE3:
3234 qualifiers |= VT_VOLATILE;
3235 goto redo;
3236 case TOK_RESTRICT1:
3237 case TOK_RESTRICT2:
3238 case TOK_RESTRICT3:
3239 goto redo;
3240 }
3241 mk_pointer(type);
3242 type->t |= qualifiers;
3243 }
3244
3245 /* XXX: clarify attribute handling */
3246 if (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2)
3247 parse_attribute(ad);
3248
3249 /* recursive type */
3250 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
3251 type1.t = 0; /* XXX: same as int */
3252 if (tok == '(') {
3253 next();
3254 /* XXX: this is not correct to modify 'ad' at this point, but
3255 the syntax is not clear */
3256 if (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2)
3257 parse_attribute(ad);
3258 type_decl(&type1, ad, v, td);
3259 skip(')');
3260 } else {
3261 /* type identifier */
3262 if (tok >= TOK_IDENT && (td & TYPE_DIRECT)) {
3263 *v = tok;
3264 next();
3265 } else {
3266 if (!(td & TYPE_ABSTRACT))
3267 expect("identifier");
3268 *v = 0;
3269 }
3270 }
3271 storage = type->t & VT_STORAGE;
3272 type->t &= ~VT_STORAGE;
3273 post_type(type, ad);
3274 type->t |= storage;
3275 if (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2)
3276 parse_attribute(ad);
3277
3278 if (!type1.t)
3279 return;
3280 /* append type at the end of type1 */
3281 type2 = &type1;
3282 for(;;) {
3283 s = type2->ref;
3284 type2 = &s->type;
3285 if (!type2->t) {
3286 *type2 = *type;
3287 break;
3288 }
3289 }
3290 *type = type1;
3291 }
3292
3293 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
3294 ST_FUNC int lvalue_type(int t)
3295 {
3296 int bt, r;
3297 r = VT_LVAL;
3298 bt = t & VT_BTYPE;
3299 if (bt == VT_BYTE || bt == VT_BOOL)
3300 r |= VT_LVAL_BYTE;
3301 else if (bt == VT_SHORT)
3302 r |= VT_LVAL_SHORT;
3303 else
3304 return r;
3305 if (t & VT_UNSIGNED)
3306 r |= VT_LVAL_UNSIGNED;
3307 return r;
3308 }
3309
3310 /* indirection with full error checking and bound check */
3311 ST_FUNC void indir(void)
3312 {
3313 if ((vtop->type.t & VT_BTYPE) != VT_PTR) {
3314 if ((vtop->type.t & VT_BTYPE) == VT_FUNC)
3315 return;
3316 expect("pointer");
3317 }
3318 if ((vtop->r & VT_LVAL) && !nocode_wanted)
3319 gv(RC_INT);
3320 vtop->type = *pointed_type(&vtop->type);
3321 /* Arrays and functions are never lvalues */
3322 if (!(vtop->type.t & VT_ARRAY) && !(vtop->type.t & VT_VLA)
3323 && (vtop->type.t & VT_BTYPE) != VT_FUNC) {
3324 vtop->r |= lvalue_type(vtop->type.t);
3325 /* if bound checking, the referenced pointer must be checked */
3326 #ifdef CONFIG_TCC_BCHECK
3327 if (tcc_state->do_bounds_check)
3328 vtop->r |= VT_MUSTBOUND;
3329 #endif
3330 }
3331 }
3332
3333 /* pass a parameter to a function and do type checking and casting */
3334 static void gfunc_param_typed(Sym *func, Sym *arg)
3335 {
3336 int func_type;
3337 CType type;
3338
3339 func_type = func->c;
3340 if (func_type == FUNC_OLD ||
3341 (func_type == FUNC_ELLIPSIS && arg == NULL)) {
3342 /* default casting : only need to convert float to double */
3343 if ((vtop->type.t & VT_BTYPE) == VT_FLOAT) {
3344 type.t = VT_DOUBLE;
3345 gen_cast(&type);
3346 }
3347 } else if (arg == NULL) {
3348 error("too many arguments to function");
3349 } else {
3350 type = arg->type;
3351 type.t &= ~VT_CONSTANT; /* need to do that to avoid false warning */
3352 gen_assign_cast(&type);
3353 }
3354 }
3355
3356 /* parse an expression of the form '(type)' or '(expr)' and return its
3357 type */
3358 static void parse_expr_type(CType *type)
3359 {
3360 int n;
3361 AttributeDef ad;
3362
3363 skip('(');
3364 if (parse_btype(type, &ad)) {
3365 type_decl(type, &ad, &n, TYPE_ABSTRACT);
3366 } else {
3367 expr_type(type);
3368 }
3369 skip(')');
3370 }
3371
3372 static void parse_type(CType *type)
3373 {
3374 AttributeDef ad;
3375 int n;
3376
3377 if (!parse_btype(type, &ad)) {
3378 expect("type");
3379 }
3380 type_decl(type, &ad, &n, TYPE_ABSTRACT);
3381 }
3382
3383 static void vpush_tokc(int t)
3384 {
3385 CType type;
3386 type.t = t;
3387 type.ref = 0;
3388 vsetc(&type, VT_CONST, &tokc);
3389 }
3390
3391 ST_FUNC void unary(void)
3392 {
3393 int n, t, align, size, r, sizeof_caller;
3394 CType type;
3395 Sym *s;
3396 AttributeDef ad;
3397 static int in_sizeof = 0;
3398
3399 sizeof_caller = in_sizeof;
3400 in_sizeof = 0;
3401 /* XXX: GCC 2.95.3 does not generate a table although it should be
3402 better here */
3403 tok_next:
3404 switch(tok) {
3405 case TOK_EXTENSION:
3406 next();
3407 goto tok_next;
3408 case TOK_CINT:
3409 case TOK_CCHAR:
3410 case TOK_LCHAR:
3411 vpushi(tokc.i);
3412 next();
3413 break;
3414 case TOK_CUINT:
3415 vpush_tokc(VT_INT | VT_UNSIGNED);
3416 next();
3417 break;
3418 case TOK_CLLONG:
3419 vpush_tokc(VT_LLONG);
3420 next();
3421 break;
3422 case TOK_CULLONG:
3423 vpush_tokc(VT_LLONG | VT_UNSIGNED);
3424 next();
3425 break;
3426 case TOK_CFLOAT:
3427 vpush_tokc(VT_FLOAT);
3428 next();
3429 break;
3430 case TOK_CDOUBLE:
3431 vpush_tokc(VT_DOUBLE);
3432 next();
3433 break;
3434 case TOK_CLDOUBLE:
3435 vpush_tokc(VT_LDOUBLE);
3436 next();
3437 break;
3438 case TOK___FUNCTION__:
3439 if (!gnu_ext)
3440 goto tok_identifier;
3441 /* fall thru */
3442 case TOK___FUNC__:
3443 {
3444 void *ptr;
3445 int len;
3446 /* special function name identifier */
3447 len = strlen(funcname) + 1;
3448 /* generate char[len] type */
3449 type.t = VT_BYTE;
3450 mk_pointer(&type);
3451 type.t |= VT_ARRAY;
3452 type.ref->c = len;
3453 vpush_ref(&type, data_section, data_section->data_offset, len);
3454 ptr = section_ptr_add(data_section, len);
3455 memcpy(ptr, funcname, len);
3456 next();
3457 }
3458 break;
3459 case TOK_LSTR:
3460 #ifdef TCC_TARGET_PE
3461 t = VT_SHORT | VT_UNSIGNED;
3462 #else
3463 t = VT_INT;
3464 #endif
3465 goto str_init;
3466 case TOK_STR:
3467 /* string parsing */
3468 t = VT_BYTE;
3469 str_init:
3470 if (tcc_state->warn_write_strings)
3471 t |= VT_CONSTANT;
3472 type.t = t;
3473 mk_pointer(&type);
3474 type.t |= VT_ARRAY;
3475 memset(&ad, 0, sizeof(AttributeDef));
3476 decl_initializer_alloc(&type, &ad, VT_CONST, 2, 0, NULL, 0);
3477 break;
3478 case '(':
3479 next();
3480 /* cast ? */
3481 if (parse_btype(&type, &ad)) {
3482 type_decl(&type, &ad, &n, TYPE_ABSTRACT);
3483 skip(')');
3484 /* check ISOC99 compound literal */
3485 if (tok == '{') {
3486 /* data is allocated locally by default */
3487 if (global_expr)
3488 r = VT_CONST;
3489 else
3490 r = VT_LOCAL;
3491 /* all except arrays are lvalues */
3492 if (!(type.t & VT_ARRAY))
3493 r |= lvalue_type(type.t);
3494 memset(&ad, 0, sizeof(AttributeDef));
3495 decl_initializer_alloc(&type, &ad, r, 1, 0, NULL, 0);
3496 } else {
3497 if (sizeof_caller) {
3498 vpush(&type);
3499 return;
3500 }
3501 unary();
3502 gen_cast(&type);
3503 }
3504 } else if (tok == '{') {
3505 /* save all registers */
3506 save_regs(0);
3507 /* statement expression : we do not accept break/continue
3508 inside as GCC does */
3509 block(NULL, NULL, NULL, NULL, 0, 1);
3510 skip(')');
3511 } else {
3512 gexpr();
3513 skip(')');
3514 }
3515 break;
3516 case '*':
3517 next();
3518 unary();
3519 indir();
3520 break;
3521 case '&':
3522 next();
3523 unary();
3524 /* functions names must be treated as function pointers,
3525 except for unary '&' and sizeof. Since we consider that
3526 functions are not lvalues, we only have to handle it
3527 there and in function calls. */
3528 /* arrays can also be used although they are not lvalues */
3529 if ((vtop->type.t & VT_BTYPE) != VT_FUNC &&
3530 !(vtop->type.t & VT_ARRAY) && !(vtop->type.t & VT_LLOCAL))
3531 test_lvalue();
3532 mk_pointer(&vtop->type);
3533 gaddrof();
3534 break;
3535 case '!':
3536 next();
3537 unary();
3538 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
3539 CType boolean;
3540 boolean.t = VT_BOOL;
3541 gen_cast(&boolean);
3542 vtop->c.i = !vtop->c.i;
3543 } else if ((vtop->r & VT_VALMASK) == VT_CMP)
3544 vtop->c.i = vtop->c.i ^ 1;
3545 else {
3546 save_regs(1);
3547 vseti(VT_JMP, gtst(1, 0));
3548 }
3549 break;
3550 case '~':
3551 next();
3552 unary();
3553 vpushi(-1);
3554 gen_op('^');
3555 break;
3556 case '+':
3557 next();
3558 /* in order to force cast, we add zero */
3559 unary();
3560 if ((vtop->type.t & VT_BTYPE) == VT_PTR)
3561 error("pointer not accepted for unary plus");
3562 vpushi(0);
3563 gen_op('+');
3564 break;
3565 case TOK_SIZEOF:
3566 case TOK_ALIGNOF1:
3567 case TOK_ALIGNOF2:
3568 t = tok;
3569 next();
3570 in_sizeof++;
3571 unary_type(&type); // Perform a in_sizeof = 0;
3572 size = type_size(&type, &align);
3573 if (t == TOK_SIZEOF) {
3574 if (!(type.t & VT_VLA)) {
3575 if (size < 0)
3576 error("sizeof applied to an incomplete type");
3577 vpushi(size);
3578 } else {
3579 vla_runtime_type_size(&type, &align);
3580 }
3581 } else {
3582 vpushi(align);
3583 }
3584 vtop->type.t |= VT_UNSIGNED;
3585 break;
3586
3587 case TOK_builtin_types_compatible_p:
3588 {
3589 CType type1, type2;
3590 next();
3591 skip('(');
3592 parse_type(&type1);
3593 skip(',');
3594 parse_type(&type2);
3595 skip(')');
3596 type1.t &= ~(VT_CONSTANT | VT_VOLATILE);
3597 type2.t &= ~(VT_CONSTANT | VT_VOLATILE);
3598 vpushi(is_compatible_types(&type1, &type2));
3599 }
3600 break;
3601 case TOK_builtin_constant_p:
3602 {
3603 int saved_nocode_wanted, res;
3604 next();
3605 skip('(');
3606 saved_nocode_wanted = nocode_wanted;
3607 nocode_wanted = 1;
3608 gexpr();
3609 res = (vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
3610 vpop();
3611 nocode_wanted = saved_nocode_wanted;
3612 skip(')');
3613 vpushi(res);
3614 }
3615 break;
3616 case TOK_builtin_frame_address:
3617 {
3618 CType type;
3619 next();
3620 skip('(');
3621 if (tok != TOK_CINT) {
3622 error("__builtin_frame_address only takes integers");
3623 }
3624 if (tokc.i != 0) {
3625 error("TCC only supports __builtin_frame_address(0)");
3626 }
3627 next();
3628 skip(')');
3629 type.t = VT_VOID;
3630 mk_pointer(&type);
3631 vset(&type, VT_LOCAL, 0);
3632 }
3633 break;
3634 #ifdef TCC_TARGET_X86_64
3635 case TOK_builtin_va_arg_types:
3636 {
3637 /* This definition must be synced with stdarg.h */
3638 enum __va_arg_type {
3639 __va_gen_reg, __va_float_reg, __va_stack
3640 };
3641 CType type;
3642 int bt;
3643 next();
3644 skip('(');
3645 parse_type(&type);
3646 skip(')');
3647 bt = type.t & VT_BTYPE;
3648 if (bt == VT_STRUCT || bt == VT_LDOUBLE) {
3649 vpushi(__va_stack);
3650 } else if (bt == VT_FLOAT || bt == VT_DOUBLE) {
3651 vpushi(__va_float_reg);
3652 } else {
3653 vpushi(__va_gen_reg);
3654 }
3655 }
3656 break;
3657 #endif
3658 case TOK_INC:
3659 case TOK_DEC:
3660 t = tok;
3661 next();
3662 unary();
3663 inc(0, t);
3664 break;
3665 case '-':
3666 next();
3667 vpushi(0);
3668 unary();
3669 gen_op('-');
3670 break;
3671 case TOK_LAND:
3672 if (!gnu_ext)
3673 goto tok_identifier;
3674 next();
3675 /* allow to take the address of a label */
3676 if (tok < TOK_UIDENT)
3677 expect("label identifier");
3678 s = label_find(tok);
3679 if (!s) {
3680 s = label_push(&global_label_stack, tok, LABEL_FORWARD);
3681 } else {
3682 if (s->r == LABEL_DECLARED)
3683 s->r = LABEL_FORWARD;
3684 }
3685 if (!s->type.t) {
3686 s->type.t = VT_VOID;
3687 mk_pointer(&s->type);
3688 s->type.t |= VT_STATIC;
3689 }
3690 vset(&s->type, VT_CONST | VT_SYM, 0);
3691 vtop->sym = s;
3692 next();
3693 break;
3694
3695 // special qnan , snan and infinity values
3696 case TOK___NAN__:
3697 vpush64(VT_DOUBLE, 0x7ff8000000000000ULL);
3698 next();
3699 break;
3700 case TOK___SNAN__:
3701 vpush64(VT_DOUBLE, 0x7ff0000000000001ULL);
3702 next();
3703 break;
3704 case TOK___INF__:
3705 vpush64(VT_DOUBLE, 0x7ff0000000000000ULL);
3706 next();
3707 break;
3708
3709 default:
3710 tok_identifier:
3711 t = tok;
3712 next();
3713 if (t < TOK_UIDENT)
3714 expect("identifier");
3715 s = sym_find(t);
3716 if (!s) {
3717 if (tok != '(')
3718 error("'%s' undeclared", get_tok_str(t, NULL));
3719 /* for simple function calls, we tolerate undeclared
3720 external reference to int() function */
3721 if (tcc_state->warn_implicit_function_declaration)
3722 warning("implicit declaration of function '%s'",
3723 get_tok_str(t, NULL));
3724 s = external_global_sym(t, &func_old_type, 0);
3725 }
3726 if ((s->type.t & (VT_STATIC | VT_INLINE | VT_BTYPE)) ==
3727 (VT_STATIC | VT_INLINE | VT_FUNC)) {
3728 /* if referencing an inline function, then we generate a
3729 symbol to it if not already done. It will have the
3730 effect to generate code for it at the end of the
3731 compilation unit. Inline function as always
3732 generated in the text section. */
3733 if (!s->c)
3734 put_extern_sym(s, text_section, 0, 0);
3735 r = VT_SYM | VT_CONST;
3736 } else {
3737 r = s->r;
3738 }
3739 vset(&s->type, r, s->c);
3740 /* if forward reference, we must point to s */
3741 if (vtop->r & VT_SYM) {
3742 vtop->sym = s;
3743 vtop->c.ul = 0;
3744 }
3745 break;
3746 }
3747
3748 /* post operations */
3749 while (1) {
3750 if (tok == TOK_INC || tok == TOK_DEC) {
3751 inc(1, tok);
3752 next();
3753 } else if (tok == '.' || tok == TOK_ARROW) {
3754 int qualifiers;
3755 /* field */
3756 if (tok == TOK_ARROW)
3757 indir();
3758 qualifiers = vtop->type.t & (VT_CONSTANT | VT_VOLATILE);
3759 test_lvalue();
3760 gaddrof();
3761 next();
3762 /* expect pointer on structure */
3763 if ((vtop->type.t & VT_BTYPE) != VT_STRUCT)
3764 expect("struct or union");
3765 s = vtop->type.ref;
3766 /* find field */
3767 tok |= SYM_FIELD;
3768 while ((s = s->next) != NULL) {
3769 if (s->v == tok)
3770 break;
3771 }
3772 if (!s)
3773 error("field not found: %s", get_tok_str(tok & ~SYM_FIELD, NULL));
3774 /* add field offset to pointer */
3775 vtop->type = char_pointer_type; /* change type to 'char *' */
3776 vpushi(s->c);
3777 gen_op('+');
3778 /* change type to field type, and set to lvalue */
3779 vtop->type = s->type;
3780 vtop->type.t |= qualifiers;
3781 /* an array is never an lvalue */
3782 if (!(vtop->type.t & VT_ARRAY)) {
3783 vtop->r |= lvalue_type(vtop->type.t);
3784 #ifdef CONFIG_TCC_BCHECK
3785 /* if bound checking, the referenced pointer must be checked */
3786 if (tcc_state->do_bounds_check)
3787 vtop->r |= VT_MUSTBOUND;
3788 #endif
3789 }
3790 next();
3791 } else if (tok == '[') {
3792 next();
3793 gexpr();
3794 gen_op('+');
3795 indir();
3796 skip(']');
3797 } else if (tok == '(') {
3798 SValue ret;
3799 Sym *sa;
3800 int nb_args;
3801
3802 /* function call */
3803 if ((vtop->type.t & VT_BTYPE) != VT_FUNC) {
3804 /* pointer test (no array accepted) */
3805 if ((vtop->type.t & (VT_BTYPE | VT_ARRAY)) == VT_PTR) {
3806 vtop->type = *pointed_type(&vtop->type);
3807 if ((vtop->type.t & VT_BTYPE) != VT_FUNC)
3808 goto error_func;
3809 } else {
3810 error_func:
3811 expect("function pointer");
3812 }
3813 } else {
3814 vtop->r &= ~VT_LVAL; /* no lvalue */
3815 }
3816 /* get return type */
3817 s = vtop->type.ref;
3818 next();
3819 sa = s->next; /* first parameter */
3820 nb_args = 0;
3821 ret.r2 = VT_CONST;
3822 /* compute first implicit argument if a structure is returned */
3823 if ((s->type.t & VT_BTYPE) == VT_STRUCT) {
3824 /* get some space for the returned structure */
3825 size = type_size(&s->type, &align);
3826 loc = (loc - size) & -align;
3827 ret.type = s->type;
3828 ret.r = VT_LOCAL | VT_LVAL;
3829 /* pass it as 'int' to avoid structure arg passing
3830 problems */
3831 vseti(VT_LOCAL, loc);
3832 ret.c = vtop->c;
3833 nb_args++;
3834 } else {
3835 ret.type = s->type;
3836 /* return in register */
3837 if (is_float(ret.type.t)) {
3838 ret.r = reg_fret(ret.type.t);
3839 } else {
3840 if ((ret.type.t & VT_BTYPE) == VT_LLONG)
3841 ret.r2 = REG_LRET;
3842 ret.r = REG_IRET;
3843 }
3844 ret.c.i = 0;
3845 }
3846 if (tok != ')') {
3847 for(;;) {
3848 expr_eq();
3849 gfunc_param_typed(s, sa);
3850 nb_args++;
3851 if (sa)
3852 sa = sa->next;
3853 if (tok == ')')
3854 break;
3855 skip(',');
3856 }
3857 }
3858 if (sa)
3859 error("too few arguments to function");
3860 skip(')');
3861 if (!nocode_wanted) {
3862 gfunc_call(nb_args);
3863 } else {
3864 vtop -= (nb_args + 1);
3865 }
3866 /* return value */
3867 vsetc(&ret.type, ret.r, &ret.c);
3868 vtop->r2 = ret.r2;
3869 } else {
3870 break;
3871 }
3872 }
3873 }
3874
3875 ST_FUNC void expr_prod(void)
3876 {
3877 int t;
3878
3879 unary();
3880 while (tok == '*' || tok == '/' || tok == '%') {
3881 t = tok;
3882 next();
3883 unary();
3884 gen_op(t);
3885 }
3886 }
3887
3888 ST_FUNC void expr_sum(void)
3889 {
3890 int t;
3891
3892 expr_prod();
3893 while (tok == '+' || tok == '-') {
3894 t = tok;
3895 next();
3896 expr_prod();
3897 gen_op(t);
3898 }
3899 }
3900
3901 static void expr_shift(void)
3902 {
3903 int t;
3904
3905 expr_sum();
3906 while (tok == TOK_SHL || tok == TOK_SAR) {
3907 t = tok;
3908 next();
3909 expr_sum();
3910 gen_op(t);
3911 }
3912 }
3913
3914 static void expr_cmp(void)
3915 {
3916 int t;
3917
3918 expr_shift();
3919 while ((tok >= TOK_ULE && tok <= TOK_GT) ||
3920 tok == TOK_ULT || tok == TOK_UGE) {
3921 t = tok;
3922 next();
3923 expr_shift();
3924 gen_op(t);
3925 }
3926 }
3927
3928 static void expr_cmpeq(void)
3929 {
3930 int t;
3931
3932 expr_cmp();
3933 while (tok == TOK_EQ || tok == TOK_NE) {
3934 t = tok;
3935 next();
3936 expr_cmp();
3937 gen_op(t);
3938 }
3939 }
3940
3941 static void expr_and(void)
3942 {
3943 expr_cmpeq();
3944 while (tok == '&') {
3945 next();
3946 expr_cmpeq();
3947 gen_op('&');
3948 }
3949 }
3950
3951 static void expr_xor(void)
3952 {
3953 expr_and();
3954 while (tok == '^') {
3955 next();
3956 expr_and();
3957 gen_op('^');
3958 }
3959 }
3960
3961 static void expr_or(void)
3962 {
3963 expr_xor();
3964 while (tok == '|') {
3965 next();
3966 expr_xor();
3967 gen_op('|');
3968 }
3969 }
3970
3971 /* XXX: fix this mess */
3972 static void expr_land_const(void)
3973 {
3974 expr_or();
3975 while (tok == TOK_LAND) {
3976 next();
3977 expr_or();
3978 gen_op(TOK_LAND);
3979 }
3980 }
3981
3982 /* XXX: fix this mess */
3983 static void expr_lor_const(void)
3984 {
3985 expr_land_const();
3986 while (tok == TOK_LOR) {
3987 next();
3988 expr_land_const();
3989 gen_op(TOK_LOR);
3990 }
3991 }
3992
3993 /* only used if non constant */
3994 static void expr_land(void)
3995 {
3996 int t;
3997
3998 expr_or();
3999 if (tok == TOK_LAND) {
4000 t = 0;
4001 save_regs(1);
4002 for(;;) {
4003 t = gtst(1, t);
4004 if (tok != TOK_LAND) {
4005 vseti(VT_JMPI, t);
4006 break;
4007 }
4008 next();
4009 expr_or();
4010 }
4011 }
4012 }
4013
4014 static void expr_lor(void)
4015 {
4016 int t;
4017
4018 expr_land();
4019 if (tok == TOK_LOR) {
4020 t = 0;
4021 save_regs(1);
4022 for(;;) {
4023 t = gtst(0, t);
4024 if (tok != TOK_LOR) {
4025 vseti(VT_JMP, t);
4026 break;
4027 }
4028 next();
4029 expr_land();
4030 }
4031 }
4032 }
4033
4034 /* XXX: better constant handling */
4035 static void expr_cond(void)
4036 {
4037 int tt, u, r1, r2, rc, t1, t2, bt1, bt2;
4038 SValue sv;
4039 CType type, type1, type2;
4040
4041 if (const_wanted) {
4042 expr_lor_const();
4043 if (tok == '?') {
4044 CType boolean;
4045 int c;
4046 boolean.t = VT_BOOL;
4047 vdup();
4048 gen_cast(&boolean);
4049 c = vtop->c.i;
4050 vpop();
4051 next();
4052 if (tok != ':' || !gnu_ext) {
4053 vpop();
4054 gexpr();
4055 }
4056 if (!c)
4057 vpop();
4058 skip(':');
4059 expr_cond();
4060 if (c)
4061 vpop();
4062 }
4063 } else {
4064 expr_lor();
4065 if (tok == '?') {
4066 next();
4067 if (vtop != vstack) {
4068 /* needed to avoid having different registers saved in
4069 each branch */
4070 if (is_float(vtop->type.t)) {
4071 rc = RC_FLOAT;
4072 #ifdef TCC_TARGET_X86_64
4073 if ((vtop->type.t & VT_BTYPE) == VT_LDOUBLE) {
4074 rc = RC_ST0;
4075 }
4076 #endif
4077 }
4078 else
4079 rc = RC_INT;
4080 gv(rc);
4081 save_regs(1);
4082 }
4083 if (tok == ':' && gnu_ext) {
4084 gv_dup();
4085 tt = gtst(1, 0);
4086 } else {
4087 tt = gtst(1, 0);
4088 gexpr();
4089 }
4090 type1 = vtop->type;
4091 sv = *vtop; /* save value to handle it later */
4092 vtop--; /* no vpop so that FP stack is not flushed */
4093 skip(':');
4094 u = gjmp(0);
4095 gsym(tt);
4096 expr_cond();
4097 type2 = vtop->type;
4098
4099 t1 = type1.t;
4100 bt1 = t1 & VT_BTYPE;
4101 t2 = type2.t;
4102 bt2 = t2 & VT_BTYPE;
4103 /* cast operands to correct type according to ISOC rules */
4104 if (is_float(bt1) || is_float(bt2)) {
4105 if (bt1 == VT_LDOUBLE || bt2 == VT_LDOUBLE) {
4106 type.t = VT_LDOUBLE;
4107 } else if (bt1 == VT_DOUBLE || bt2 == VT_DOUBLE) {
4108 type.t = VT_DOUBLE;
4109 } else {
4110 type.t = VT_FLOAT;
4111 }
4112 } else if (bt1 == VT_LLONG || bt2 == VT_LLONG) {
4113 /* cast to biggest op */
4114 type.t = VT_LLONG;
4115 /* convert to unsigned if it does not fit in a long long */
4116 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED) ||
4117 (t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED))
4118 type.t |= VT_UNSIGNED;
4119 } else if (bt1 == VT_PTR || bt2 == VT_PTR) {
4120 /* XXX: test pointer compatibility */
4121 type = type1;
4122 } else if (bt1 == VT_FUNC || bt2 == VT_FUNC) {
4123 /* XXX: test function pointer compatibility */
4124 type = type1;
4125 } else if (bt1 == VT_STRUCT || bt2 == VT_STRUCT) {
4126 /* XXX: test structure compatibility */
4127 type = type1;
4128 } else if (bt1 == VT_VOID || bt2 == VT_VOID) {
4129 /* NOTE: as an extension, we accept void on only one side */
4130 type.t = VT_VOID;
4131 } else {
4132 /* integer operations */
4133 type.t = VT_INT;
4134 /* convert to unsigned if it does not fit in an integer */
4135 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED) ||
4136 (t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED))
4137 type.t |= VT_UNSIGNED;
4138 }
4139
4140 /* now we convert second operand */
4141 gen_cast(&type);
4142 if (VT_STRUCT == (vtop->type.t & VT_BTYPE))
4143 gaddrof();
4144 rc = RC_INT;
4145 if (is_float(type.t)) {
4146 rc = RC_FLOAT;
4147 #ifdef TCC_TARGET_X86_64
4148 if ((type.t & VT_BTYPE) == VT_LDOUBLE) {
4149 rc = RC_ST0;
4150 }
4151 #endif
4152 } else if ((type.t & VT_BTYPE) == VT_LLONG) {
4153 /* for long longs, we use fixed registers to avoid having
4154 to handle a complicated move */
4155 rc = RC_IRET;
4156 }
4157
4158 r2 = gv(rc);
4159 /* this is horrible, but we must also convert first
4160 operand */
4161 tt = gjmp(0);
4162 gsym(u);
4163 /* put again first value and cast it */
4164 *vtop = sv;
4165 gen_cast(&type);
4166 if (VT_STRUCT == (vtop->type.t & VT_BTYPE))
4167 gaddrof();
4168 r1 = gv(rc);
4169 move_reg(r2, r1);
4170 vtop->r = r2;
4171 gsym(tt);
4172 }
4173 }
4174 }
4175
4176 static void expr_eq(void)
4177 {
4178 int t;
4179
4180 expr_cond();
4181 if (tok == '=' ||
4182 (tok >= TOK_A_MOD && tok <= TOK_A_DIV) ||
4183 tok == TOK_A_XOR || tok == TOK_A_OR ||
4184 tok == TOK_A_SHL || tok == TOK_A_SAR) {
4185 test_lvalue();
4186 t = tok;
4187 next();
4188 if (t == '=') {
4189 expr_eq();
4190 } else {
4191 vdup();
4192 expr_eq();
4193 gen_op(t & 0x7f);
4194 }
4195 vstore();
4196 }
4197 }
4198
4199 ST_FUNC void gexpr(void)
4200 {
4201 while (1) {
4202 expr_eq();
4203 if (tok != ',')
4204 break;
4205 vpop();
4206 next();
4207 }
4208 }
4209
4210 /* parse an expression and return its type without any side effect. */
4211 static void expr_type(CType *type)
4212 {
4213 int saved_nocode_wanted;
4214
4215 saved_nocode_wanted = nocode_wanted;
4216 nocode_wanted = 1;
4217 gexpr();
4218 *type = vtop->type;
4219 vpop();
4220 nocode_wanted = saved_nocode_wanted;
4221 }
4222
4223 /* parse a unary expression and return its type without any side
4224 effect. */
4225 static void unary_type(CType *type)
4226 {
4227 int a;
4228
4229 a = nocode_wanted;
4230 nocode_wanted = 1;
4231 unary();
4232 *type = vtop->type;
4233 vpop();
4234 nocode_wanted = a;
4235 }
4236
4237 /* parse a constant expression and return value in vtop. */
4238 static void expr_const1(void)
4239 {
4240 int a;
4241 a = const_wanted;
4242 const_wanted = 1;
4243 expr_cond();
4244 const_wanted = a;
4245 }
4246
4247 /* parse an integer constant and return its value. */
4248 ST_FUNC int expr_const(void)
4249 {
4250 int c;
4251 expr_const1();
4252 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) != VT_CONST)
4253 expect("constant expression");
4254 c = vtop->c.i;
4255 vpop();
4256 return c;
4257 }
4258
4259 /* return the label token if current token is a label, otherwise
4260 return zero */
4261 static int is_label(void)
4262 {
4263 int last_tok;
4264
4265 /* fast test first */
4266 if (tok < TOK_UIDENT)
4267 return 0;
4268 /* no need to save tokc because tok is an identifier */
4269 last_tok = tok;
4270 next();
4271 if (tok == ':') {
4272 next();
4273 return last_tok;
4274 } else {
4275 unget_tok(last_tok);
4276 return 0;
4277 }
4278 }
4279
4280 static void block(int *bsym, int *csym, int *case_sym, int *def_sym,
4281 int case_reg, int is_expr)
4282 {
4283 int a, b, c, d;
4284 Sym *s;
4285
4286 /* generate line number info */
4287 if (tcc_state->do_debug &&
4288 (last_line_num != file->line_num || last_ind != ind)) {
4289 put_stabn(N_SLINE, 0, file->line_num, ind - func_ind);
4290 last_ind = ind;
4291 last_line_num = file->line_num;
4292 }
4293
4294 if (is_expr) {
4295 /* default return value is (void) */
4296 vpushi(0);
4297 vtop->type.t = VT_VOID;
4298 }
4299
4300 if (tok == TOK_IF) {
4301 /* if test */
4302 next();
4303 skip('(');
4304 gexpr();
4305 skip(')');
4306 a = gtst(1, 0);
4307 block(bsym, csym, case_sym, def_sym, case_reg, 0);
4308 c = tok;
4309 if (c == TOK_ELSE) {
4310 next();
4311 d = gjmp(0);
4312 gsym(a);
4313 block(bsym, csym, case_sym, def_sym, case_reg, 0);
4314 gsym(d); /* patch else jmp */
4315 } else
4316 gsym(a);
4317 } else if (tok == TOK_WHILE) {
4318 next();
4319 d = ind;
4320 skip('(');
4321 gexpr();
4322 skip(')');
4323 a = gtst(1, 0);
4324 b = 0;
4325 block(&a, &b, case_sym, def_sym, case_reg, 0);
4326 gjmp_addr(d);
4327 gsym(a);
4328 gsym_addr(b, d);
4329 } else if (tok == '{') {
4330 Sym *llabel;
4331
4332 next();
4333 /* record local declaration stack position */
4334 s = local_stack;
4335 llabel = local_label_stack;
4336 /* handle local labels declarations */
4337 if (tok == TOK_LABEL) {
4338 next();
4339 for(;;) {
4340 if (tok < TOK_UIDENT)
4341 expect("label identifier");
4342 label_push(&local_label_stack, tok, LABEL_DECLARED);
4343 next();
4344 if (tok == ',') {
4345 next();
4346 } else {
4347 skip(';');
4348 break;
4349 }
4350 }
4351 }
4352 while (tok != '}') {
4353 decl(VT_LOCAL);
4354 if (tok != '}') {
4355 if (is_expr)
4356 vpop();
4357 block(bsym, csym, case_sym, def_sym, case_reg, is_expr);
4358 }
4359 }
4360 /* pop locally defined labels */
4361 label_pop(&local_label_stack, llabel);
4362 if(is_expr) {
4363 /* XXX: this solution makes only valgrind happy...
4364 triggered by gcc.c-torture/execute/20000917-1.c */
4365 Sym *p;
4366 switch(vtop->type.t & VT_BTYPE) {
4367 case VT_PTR:
4368 case VT_STRUCT:
4369 case VT_ENUM:
4370 case VT_FUNC:
4371 for(p=vtop->type.ref;p;p=p->prev)
4372 if(p->prev==s)
4373 error("unsupported expression type");
4374 }
4375 }
4376 /* pop locally defined symbols */
4377 sym_pop(&local_stack, s);
4378 next();
4379 } else if (tok == TOK_RETURN) {
4380 next();
4381 if (tok != ';') {
4382 gexpr();
4383 gen_assign_cast(&func_vt);
4384 if ((func_vt.t & VT_BTYPE) == VT_STRUCT) {
4385 CType type;
4386 /* if returning structure, must copy it to implicit
4387 first pointer arg location */
4388 #ifdef TCC_ARM_EABI
4389 int align, size;
4390 size = type_size(&func_vt,&align);
4391 if(size <= 4)
4392 {
4393 if((vtop->r != (VT_LOCAL | VT_LVAL) || (vtop->c.i & 3))
4394 && (align & 3))
4395 {
4396 int addr;
4397 loc = (loc - size) & -4;
4398 addr = loc;
4399 type = func_vt;
4400 vset(&type, VT_LOCAL | VT_LVAL, addr);
4401 vswap();
4402 vstore();
4403 vset(&int_type, VT_LOCAL | VT_LVAL, addr);
4404 }
4405 vtop->type = int_type;
4406 gv(RC_IRET);
4407 } else {
4408 #endif
4409 type = func_vt;
4410 mk_pointer(&type);
4411 vset(&type, VT_LOCAL | VT_LVAL, func_vc);
4412 indir();
4413 vswap();
4414 /* copy structure value to pointer */
4415 vstore();
4416 #ifdef TCC_ARM_EABI
4417 }
4418 #endif
4419 } else if (is_float(func_vt.t)) {
4420 gv(rc_fret(func_vt.t));
4421 } else {
4422 gv(RC_IRET);
4423 }
4424 vtop--; /* NOT vpop() because on x86 it would flush the fp stack */
4425 }
4426 skip(';');
4427 rsym = gjmp(rsym); /* jmp */
4428 } else if (tok == TOK_BREAK) {
4429 /* compute jump */
4430 if (!bsym)
4431 error("cannot break");
4432 *bsym = gjmp(*bsym);
4433 next();
4434 skip(';');
4435 } else if (tok == TOK_CONTINUE) {
4436 /* compute jump */
4437 if (!csym)
4438 error("cannot continue");
4439 *csym = gjmp(*csym);
4440 next();
4441 skip(';');
4442 } else if (tok == TOK_FOR) {
4443 int e;
4444 next();
4445 skip('(');
4446 s = local_stack;
4447 if (tok != ';') {
4448 /* c99 for-loop init decl? */
4449 if (!decl0(VT_LOCAL, 1)) {
4450 /* no, regular for-loop init expr */
4451 gexpr();
4452 vpop();
4453 }
4454 }
4455 skip(';');
4456 d = ind;
4457 c = ind;
4458 a = 0;
4459 b = 0;
4460 if (tok != ';') {
4461 gexpr();
4462 a = gtst(1, 0);
4463 }
4464 skip(';');
4465 if (tok != ')') {
4466 e = gjmp(0);
4467 c = ind;
4468 gexpr();
4469 vpop();
4470 gjmp_addr(d);
4471 gsym(e);
4472 }
4473 skip(')');
4474 block(&a, &b, case_sym, def_sym, case_reg, 0);
4475 gjmp_addr(c);
4476 gsym(a);
4477 gsym_addr(b, c);
4478 sym_pop(&local_stack, s);
4479 } else
4480 if (tok == TOK_DO) {
4481 next();
4482 a = 0;
4483 b = 0;
4484 d = ind;
4485 block(&a, &b, case_sym, def_sym, case_reg, 0);
4486 skip(TOK_WHILE);
4487 skip('(');
4488 gsym(b);
4489 gexpr();
4490 c = gtst(0, 0);
4491 gsym_addr(c, d);
4492 skip(')');
4493 gsym(a);
4494 skip(';');
4495 } else
4496 if (tok == TOK_SWITCH) {
4497 next();
4498 skip('(');
4499 gexpr();
4500 /* XXX: other types than integer */
4501 case_reg = gv(RC_INT);
4502 vpop();
4503 skip(')');
4504 a = 0;
4505 b = gjmp(0); /* jump to first case */
4506 c = 0;
4507 block(&a, csym, &b, &c, case_reg, 0);
4508 /* if no default, jmp after switch */
4509 if (c == 0)
4510 c = ind;
4511 /* default label */
4512 gsym_addr(b, c);
4513 /* break label */
4514 gsym(a);
4515 } else
4516 if (tok == TOK_CASE) {
4517 int v1, v2;
4518 if (!case_sym)
4519 expect("switch");
4520 next();
4521 v1 = expr_const();
4522 v2 = v1;
4523 if (gnu_ext && tok == TOK_DOTS) {
4524 next();
4525 v2 = expr_const();
4526 if (v2 < v1)
4527 warning("empty case range");
4528 }
4529 /* since a case is like a label, we must skip it with a jmp */
4530 b = gjmp(0);
4531 gsym(*case_sym);
4532 vseti(case_reg, 0);
4533 vpushi(v1);
4534 if (v1 == v2) {
4535 gen_op(TOK_EQ);
4536 *case_sym = gtst(1, 0);
4537 } else {
4538 gen_op(TOK_GE);
4539 *case_sym = gtst(1, 0);
4540 vseti(case_reg, 0);
4541 vpushi(v2);
4542 gen_op(TOK_LE);
4543 *case_sym = gtst(1, *case_sym);
4544 }
4545 gsym(b);
4546 skip(':');
4547 is_expr = 0;
4548 goto block_after_label;
4549 } else
4550 if (tok == TOK_DEFAULT) {
4551 next();
4552 skip(':');
4553 if (!def_sym)
4554 expect("switch");
4555 if (*def_sym)
4556 error("too many 'default'");
4557 *def_sym = ind;
4558 is_expr = 0;
4559 goto block_after_label;
4560 } else
4561 if (tok == TOK_GOTO) {
4562 next();
4563 if (tok == '*' && gnu_ext) {
4564 /* computed goto */
4565 next();
4566 gexpr();
4567 if ((vtop->type.t & VT_BTYPE) != VT_PTR)
4568 expect("pointer");
4569 ggoto();
4570 } else if (tok >= TOK_UIDENT) {
4571 s = label_find(tok);
4572 /* put forward definition if needed */
4573 if (!s) {
4574 s = label_push(&global_label_stack, tok, LABEL_FORWARD);
4575 } else {
4576 if (s->r == LABEL_DECLARED)
4577 s->r = LABEL_FORWARD;
4578 }
4579 /* label already defined */
4580 if (s->r & LABEL_FORWARD)
4581 s->jnext = gjmp(s->jnext);
4582 else
4583 gjmp_addr(s->jnext);
4584 next();
4585 } else {
4586 expect("label identifier");
4587 }
4588 skip(';');
4589 } else if (tok == TOK_ASM1 || tok == TOK_ASM2 || tok == TOK_ASM3) {
4590 asm_instr();
4591 } else {
4592 b = is_label();
4593 if (b) {
4594 /* label case */
4595 s = label_find(b);
4596 if (s) {
4597 if (s->r == LABEL_DEFINED)
4598 error("duplicate label '%s'", get_tok_str(s->v, NULL));
4599 gsym(s->jnext);
4600 s->r = LABEL_DEFINED;
4601 } else {
4602 s = label_push(&global_label_stack, b, LABEL_DEFINED);
4603 }
4604 s->jnext = ind;
4605 /* we accept this, but it is a mistake */
4606 block_after_label:
4607 if (tok == '}') {
4608 warning("deprecated use of label at end of compound statement");
4609 } else {
4610 if (is_expr)
4611 vpop();
4612 block(bsym, csym, case_sym, def_sym, case_reg, is_expr);
4613 }
4614 } else {
4615 /* expression case */
4616 if (tok != ';') {
4617 if (is_expr) {
4618 vpop();
4619 gexpr();
4620 } else {
4621 gexpr();
4622 vpop();
4623 }
4624 }
4625 skip(';');
4626 }
4627 }
4628 }
4629
4630 /* t is the array or struct type. c is the array or struct
4631 address. cur_index/cur_field is the pointer to the current
4632 value. 'size_only' is true if only size info is needed (only used
4633 in arrays) */
4634 static void decl_designator(CType *type, Section *sec, unsigned long c,
4635 int *cur_index, Sym **cur_field,
4636 int size_only)
4637 {
4638 Sym *s, *f;
4639 int notfirst, index, index_last, align, l, nb_elems, elem_size;
4640 CType type1;
4641
4642 notfirst = 0;
4643 elem_size = 0;
4644 nb_elems = 1;
4645 if (gnu_ext && (l = is_label()) != 0)
4646 goto struct_field;
4647 while (tok == '[' || tok == '.') {
4648 if (tok == '[') {
4649 if (!(type->t & VT_ARRAY))
4650 expect("array type");
4651 s = type->ref;
4652 next();
4653 index = expr_const();
4654 if (index < 0 || (s->c >= 0 && index >= s->c))
4655 expect("invalid index");
4656 if (tok == TOK_DOTS && gnu_ext) {
4657 next();
4658 index_last = expr_const();
4659 if (index_last < 0 ||
4660 (s->c >= 0 && index_last >= s->c) ||
4661 index_last < index)
4662 expect("invalid index");
4663 } else {
4664 index_last = index;
4665 }
4666 skip(']');
4667 if (!notfirst)
4668 *cur_index = index_last;
4669 type = pointed_type(type);
4670 elem_size = type_size(type, &align);
4671 c += index * elem_size;
4672 /* NOTE: we only support ranges for last designator */
4673 nb_elems = index_last - index + 1;
4674 if (nb_elems != 1) {
4675 notfirst = 1;
4676 break;
4677 }
4678 } else {
4679 next();
4680 l = tok;
4681 next();
4682 struct_field:
4683 if ((type->t & VT_BTYPE) != VT_STRUCT)
4684 expect("struct/union type");
4685 s = type->ref;
4686 l |= SYM_FIELD;
4687 f = s->next;
4688 while (f) {
4689 if (f->v == l)
4690 break;
4691 f = f->next;
4692 }
4693 if (!f)
4694 expect("field");
4695 if (!notfirst)
4696 *cur_field = f;
4697 /* XXX: fix this mess by using explicit storage field */
4698 type1 = f->type;
4699 type1.t |= (type->t & ~VT_TYPE);
4700 type = &type1;
4701 c += f->c;
4702 }
4703 notfirst = 1;
4704 }
4705 if (notfirst) {
4706 if (tok == '=') {
4707 next();
4708 } else {
4709 if (!gnu_ext)
4710 expect("=");
4711 }
4712 } else {
4713 if (type->t & VT_ARRAY) {
4714 index = *cur_index;
4715 type = pointed_type(type);
4716 c += index * type_size(type, &align);
4717 } else {
4718 f = *cur_field;
4719 if (!f)
4720 error("too many field init");
4721 /* XXX: fix this mess by using explicit storage field */
4722 type1 = f->type;
4723 type1.t |= (type->t & ~VT_TYPE);
4724 type = &type1;
4725 c += f->c;
4726 }
4727 }
4728 decl_initializer(type, sec, c, 0, size_only);
4729
4730 /* XXX: make it more general */
4731 if (!size_only && nb_elems > 1) {
4732 unsigned long c_end;
4733 uint8_t *src, *dst;
4734 int i;
4735
4736 if (!sec)
4737 error("range init not supported yet for dynamic storage");
4738 c_end = c + nb_elems * elem_size;
4739 if (c_end > sec->data_allocated)
4740 section_realloc(sec, c_end);
4741 src = sec->data + c;
4742 dst = src;
4743 for(i = 1; i < nb_elems; i++) {
4744 dst += elem_size;
4745 memcpy(dst, src, elem_size);
4746 }
4747 }
4748 }
4749
4750 #define EXPR_VAL 0
4751 #define EXPR_CONST 1
4752 #define EXPR_ANY 2
4753
4754 /* store a value or an expression directly in global data or in local array */
4755 static void init_putv(CType *type, Section *sec, unsigned long c,
4756 int v, int expr_type)
4757 {
4758 int saved_global_expr, bt, bit_pos, bit_size;
4759 void *ptr;
4760 unsigned long long bit_mask;
4761 CType dtype;
4762
4763 switch(expr_type) {
4764 case EXPR_VAL:
4765 vpushi(v);
4766 break;
4767 case EXPR_CONST:
4768 /* compound literals must be allocated globally in this case */
4769 saved_global_expr = global_expr;
4770 global_expr = 1;
4771 expr_const1();
4772 global_expr = saved_global_expr;
4773 /* NOTE: symbols are accepted */
4774 if ((vtop->r & (VT_VALMASK | VT_LVAL)) != VT_CONST)
4775 error("initializer element is not constant");
4776 break;
4777 case EXPR_ANY:
4778 expr_eq();
4779 break;
4780 }
4781
4782 dtype = *type;
4783 dtype.t &= ~VT_CONSTANT; /* need to do that to avoid false warning */
4784
4785 if (sec) {
4786 /* XXX: not portable */
4787 /* XXX: generate error if incorrect relocation */
4788 gen_assign_cast(&dtype);
4789 bt = type->t & VT_BTYPE;
4790 /* we'll write at most 12 bytes */
4791 if (c + 12 > sec->data_allocated) {
4792 section_realloc(sec, c + 12);
4793 }
4794 ptr = sec->data + c;
4795 /* XXX: make code faster ? */
4796 if (!(type->t & VT_BITFIELD)) {
4797 bit_pos = 0;
4798 bit_size = 32;
4799 bit_mask = -1LL;
4800 } else {
4801 bit_pos = (vtop->type.t >> VT_STRUCT_SHIFT) & 0x3f;
4802 bit_size = (vtop->type.t >> (VT_STRUCT_SHIFT + 6)) & 0x3f;
4803 bit_mask = (1LL << bit_size) - 1;
4804 }
4805 if ((vtop->r & VT_SYM) &&
4806 (bt == VT_BYTE ||
4807 bt == VT_SHORT ||
4808 bt == VT_DOUBLE ||
4809 bt == VT_LDOUBLE ||
4810 bt == VT_LLONG ||
4811 (bt == VT_INT && bit_size != 32)))
4812 error("initializer element is not computable at load time");
4813 switch(bt) {
4814 case VT_BOOL:
4815 vtop->c.i = (vtop->c.i != 0);
4816 case VT_BYTE:
4817 *(char *)ptr |= (vtop->c.i & bit_mask) << bit_pos;
4818 break;
4819 case VT_SHORT:
4820 *(short *)ptr |= (vtop->c.i & bit_mask) << bit_pos;
4821 break;
4822 case VT_DOUBLE:
4823 *(double *)ptr = vtop->c.d;
4824 break;
4825 case VT_LDOUBLE:
4826 *(long double *)ptr = vtop->c.ld;
4827 break;
4828 case VT_LLONG:
4829 *(long long *)ptr |= (vtop->c.ll & bit_mask) << bit_pos;
4830 break;
4831 default:
4832 if (vtop->r & VT_SYM) {
4833 greloc(sec, vtop->sym, c, R_DATA_PTR);
4834 }
4835 *(int *)ptr |= (vtop->c.i & bit_mask) << bit_pos;
4836 break;
4837 }
4838 vtop--;
4839 } else {
4840 vset(&dtype, VT_LOCAL|VT_LVAL, c);
4841 vswap();
4842 vstore();
4843 vpop();
4844 }
4845 }
4846
4847 /* put zeros for variable based init */
4848 static void init_putz(CType *t, Section *sec, unsigned long c, int size)
4849 {
4850 if (sec) {
4851 /* nothing to do because globals are already set to zero */
4852 } else {
4853 vpush_global_sym(&func_old_type, TOK_memset);
4854 vseti(VT_LOCAL, c);
4855 vpushi(0);
4856 vpushi(size);
4857 gfunc_call(3);
4858 }
4859 }
4860
4861 /* 't' contains the type and storage info. 'c' is the offset of the
4862 object in section 'sec'. If 'sec' is NULL, it means stack based
4863 allocation. 'first' is true if array '{' must be read (multi
4864 dimension implicit array init handling). 'size_only' is true if
4865 size only evaluation is wanted (only for arrays). */
4866 static void decl_initializer(CType *type, Section *sec, unsigned long c,
4867 int first, int size_only)
4868 {
4869 int index, array_length, n, no_oblock, nb, parlevel, parlevel1, i;
4870 int size1, align1, expr_type;
4871 Sym *s, *f;
4872 CType *t1;
4873
4874 if (type->t & VT_VLA) {
4875 #if defined TCC_TARGET_I386 || defined TCC_TARGET_X86_64
4876 int a;
4877 CValue retcval;
4878
4879 vpush_global_sym(&func_old_type, TOK_alloca);
4880 vla_runtime_type_size(type, &a);
4881 gfunc_call(1);
4882
4883 /* return value */
4884 retcval.i = 0;
4885 vsetc(type, REG_IRET, &retcval);
4886 vset(type, VT_LOCAL|VT_LVAL, c);
4887 vswap();
4888 vstore();
4889 vpop();
4890 #else
4891 error("variable length arrays unsupported for this target");
4892 #endif
4893 } else if (type->t & VT_ARRAY) {
4894 s = type->ref;
4895 n = s->c;
4896 array_length = 0;
4897 t1 = pointed_type(type);
4898 size1 = type_size(t1, &align1);
4899
4900 no_oblock = 1;
4901 if ((first && tok != TOK_LSTR && tok != TOK_STR) ||
4902 tok == '{') {
4903 if (tok != '{')
4904 error("character array initializer must be a literal,"
4905 " optionally enclosed in braces");
4906 skip('{');
4907 no_oblock = 0;
4908 }
4909
4910 /* only parse strings here if correct type (otherwise: handle
4911 them as ((w)char *) expressions */
4912 if ((tok == TOK_LSTR &&
4913 #ifdef TCC_TARGET_PE
4914 (t1->t & VT_BTYPE) == VT_SHORT && (t1->t & VT_UNSIGNED)
4915 #else
4916 (t1->t & VT_BTYPE) == VT_INT
4917 #endif
4918 ) || (tok == TOK_STR && (t1->t & VT_BTYPE) == VT_BYTE)) {
4919 while (tok == TOK_STR || tok == TOK_LSTR) {
4920 int cstr_len, ch;
4921 CString *cstr;
4922
4923 cstr = tokc.cstr;
4924 /* compute maximum number of chars wanted */
4925 if (tok == TOK_STR)
4926 cstr_len = cstr->size;
4927 else
4928 cstr_len = cstr->size / sizeof(nwchar_t);
4929 cstr_len--;
4930 nb = cstr_len;
4931 if (n >= 0 && nb > (n - array_length))
4932 nb = n - array_length;
4933 if (!size_only) {
4934 if (cstr_len > nb)
4935 warning("initializer-string for array is too long");
4936 /* in order to go faster for common case (char
4937 string in global variable, we handle it
4938 specifically */
4939 if (sec && tok == TOK_STR && size1 == 1) {
4940 memcpy(sec->data + c + array_length, cstr->data, nb);
4941 } else {
4942 for(i=0;i<nb;i++) {
4943 if (tok == TOK_STR)
4944 ch = ((unsigned char *)cstr->data)[i];
4945 else
4946 ch = ((nwchar_t *)cstr->data)[i];
4947 init_putv(t1, sec, c + (array_length + i) * size1,
4948 ch, EXPR_VAL);
4949 }
4950 }
4951 }
4952 array_length += nb;
4953 next();
4954 }
4955 /* only add trailing zero if enough storage (no
4956 warning in this case since it is standard) */
4957 if (n < 0 || array_length < n) {
4958 if (!size_only) {
4959 init_putv(t1, sec, c + (array_length * size1), 0, EXPR_VAL);
4960 }
4961 array_length++;
4962 }
4963 } else {
4964 index = 0;
4965 while (tok != '}') {
4966 decl_designator(type, sec, c, &index, NULL, size_only);
4967 if (n >= 0 && index >= n)
4968 error("index too large");
4969 /* must put zero in holes (note that doing it that way
4970 ensures that it even works with designators) */
4971 if (!size_only && array_length < index) {
4972 init_putz(t1, sec, c + array_length * size1,
4973 (index - array_length) * size1);
4974 }
4975 index++;
4976 if (index > array_length)
4977 array_length = index;
4978 /* special test for multi dimensional arrays (may not
4979 be strictly correct if designators are used at the
4980 same time) */
4981 if (index >= n && no_oblock)
4982 break;
4983 if (tok == '}')
4984 break;
4985 skip(',');
4986 }
4987 }
4988 if (!no_oblock)
4989 skip('}');
4990 /* put zeros at the end */
4991 if (!size_only && n >= 0 && array_length < n) {
4992 init_putz(t1, sec, c + array_length * size1,
4993 (n - array_length) * size1);
4994 }
4995 /* patch type size if needed */
4996 if (n < 0)
4997 s->c = array_length;
4998 } else if ((type->t & VT_BTYPE) == VT_STRUCT &&
4999 (sec || !first || tok == '{')) {
5000 int par_count;
5001
5002 /* NOTE: the previous test is a specific case for automatic
5003 struct/union init */
5004 /* XXX: union needs only one init */
5005
5006 /* XXX: this test is incorrect for local initializers
5007 beginning with ( without {. It would be much more difficult
5008 to do it correctly (ideally, the expression parser should
5009 be used in all cases) */
5010 par_count = 0;
5011 if (tok == '(') {
5012 AttributeDef ad1;
5013 CType type1;
5014 next();
5015 while (tok == '(') {
5016 par_count++;
5017 next();
5018 }
5019 if (!parse_btype(&type1, &ad1))
5020 expect("cast");
5021 type_decl(&type1, &ad1, &n, TYPE_ABSTRACT);
5022 #if 0
5023 if (!is_assignable_types(type, &type1))
5024 error("invalid type for cast");
5025 #endif
5026 skip(')');
5027 }
5028 no_oblock = 1;
5029 if (first || tok == '{') {
5030 skip('{');
5031 no_oblock = 0;
5032 }
5033 s = type->ref;
5034 f = s->next;
5035 array_length = 0;
5036 index = 0;
5037 n = s->c;
5038 while (tok != '}') {
5039 decl_designator(type, sec, c, NULL, &f, size_only);
5040 index = f->c;
5041 if (!size_only && array_length < index) {
5042 init_putz(type, sec, c + array_length,
5043 index - array_length);
5044 }
5045 index = index + type_size(&f->type, &align1);
5046 if (index > array_length)
5047 array_length = index;
5048
5049 /* gr: skip fields from same union - ugly. */
5050 while (f->next) {
5051 ///printf("index: %2d %08x -- %2d %08x\n", f->c, f->type.t, f->next->c, f->next->type.t);
5052 /* test for same offset */
5053 if (f->next->c != f->c)
5054 break;
5055 /* if yes, test for bitfield shift */
5056 if ((f->type.t & VT_BITFIELD) && (f->next->type.t & VT_BITFIELD)) {
5057 int bit_pos_1 = (f->type.t >> VT_STRUCT_SHIFT) & 0x3f;
5058 int bit_pos_2 = (f->next->type.t >> VT_STRUCT_SHIFT) & 0x3f;
5059 //printf("bitfield %d %d\n", bit_pos_1, bit_pos_2);
5060 if (bit_pos_1 != bit_pos_2)
5061 break;
5062 }
5063 f = f->next;
5064 }
5065
5066 f = f->next;
5067 if (no_oblock && f == NULL)
5068 break;
5069 if (tok == '}')
5070 break;
5071 skip(',');
5072 }
5073 /* put zeros at the end */
5074 if (!size_only && array_length < n) {
5075 init_putz(type, sec, c + array_length,
5076 n - array_length);
5077 }
5078 if (!no_oblock)
5079 skip('}');
5080 while (par_count) {
5081 skip(')');
5082 par_count--;
5083 }
5084 } else if (tok == '{') {
5085 next();
5086 decl_initializer(type, sec, c, first, size_only);
5087 skip('}');
5088 } else if (size_only) {
5089 /* just skip expression */
5090 parlevel = parlevel1 = 0;
5091 while ((parlevel > 0 || parlevel1 > 0 ||
5092 (tok != '}' && tok != ',')) && tok != -1) {
5093 if (tok == '(')
5094 parlevel++;
5095 else if (tok == ')')
5096 parlevel--;
5097 else if (tok == '{')
5098 parlevel1++;
5099 else if (tok == '}')
5100 parlevel1--;
5101 next();
5102 }
5103 } else {
5104 /* currently, we always use constant expression for globals
5105 (may change for scripting case) */
5106 expr_type = EXPR_CONST;
5107 if (!sec)
5108 expr_type = EXPR_ANY;
5109 init_putv(type, sec, c, 0, expr_type);
5110 }
5111 }
5112
5113 /* parse an initializer for type 't' if 'has_init' is non zero, and
5114 allocate space in local or global data space ('r' is either
5115 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
5116 variable 'v' with an associated name represented by 'asm_label' of
5117 scope 'scope' is declared before initializers are parsed. If 'v' is
5118 zero, then a reference to the new object is put in the value stack.
5119 If 'has_init' is 2, a special parsing is done to handle string
5120 constants. */
5121 static void decl_initializer_alloc(CType *type, AttributeDef *ad, int r,
5122 int has_init, int v, char *asm_label,
5123 int scope)
5124 {
5125 int size, align, addr, data_offset;
5126 int level;
5127 ParseState saved_parse_state = {0};
5128 TokenString init_str;
5129 Section *sec;
5130 Sym *flexible_array;
5131
5132 flexible_array = NULL;
5133 if ((type->t & VT_BTYPE) == VT_STRUCT) {
5134 Sym *field;
5135 field = type->ref;
5136 while (field && field->next)
5137 field = field->next;
5138 if (field->type.t & VT_ARRAY && field->type.ref->c < 0)
5139 flexible_array = field;
5140 }
5141
5142 size = type_size(type, &align);
5143 /* If unknown size, we must evaluate it before
5144 evaluating initializers because
5145 initializers can generate global data too
5146 (e.g. string pointers or ISOC99 compound
5147 literals). It also simplifies local
5148 initializers handling */
5149 tok_str_new(&init_str);
5150 if (size < 0 || (flexible_array && has_init)) {
5151 if (!has_init)
5152 error("unknown type size");
5153 /* get all init string */
5154 if (has_init == 2) {
5155 /* only get strings */
5156 while (tok == TOK_STR || tok == TOK_LSTR) {
5157 tok_str_add_tok(&init_str);
5158 next();
5159 }
5160 } else {
5161 level = 0;
5162 while (level > 0 || (tok != ',' && tok != ';')) {
5163 if (tok < 0)
5164 error("unexpected end of file in initializer");
5165 tok_str_add_tok(&init_str);
5166 if (tok == '{')
5167 level++;
5168 else if (tok == '}') {
5169 level--;
5170 if (level <= 0) {
5171 next();
5172 break;
5173 }
5174 }
5175 next();
5176 }
5177 }
5178 tok_str_add(&init_str, -1);
5179 tok_str_add(&init_str, 0);
5180
5181 /* compute size */
5182 save_parse_state(&saved_parse_state);
5183
5184 macro_ptr = init_str.str;
5185 next();
5186 decl_initializer(type, NULL, 0, 1, 1);
5187 /* prepare second initializer parsing */
5188 macro_ptr = init_str.str;
5189 next();
5190
5191 /* if still unknown size, error */
5192 size = type_size(type, &align);
5193 if (size < 0)
5194 error("unknown type size");
5195 }
5196 if (flexible_array)
5197 size += flexible_array->type.ref->c * pointed_size(&flexible_array->type);
5198 /* take into account specified alignment if bigger */
5199 if (ad->aligned) {
5200 if (ad->aligned > align)
5201 align = ad->aligned;
5202 } else if (ad->packed) {
5203 align = 1;
5204 }
5205 if ((r & VT_VALMASK) == VT_LOCAL) {
5206 sec = NULL;
5207 #ifdef CONFIG_TCC_BCHECK
5208 if (tcc_state->do_bounds_check && (type->t & VT_ARRAY)) {
5209 loc--;
5210 }
5211 #endif
5212 loc = (loc - size) & -align;
5213 addr = loc;
5214 #ifdef CONFIG_TCC_BCHECK
5215 /* handles bounds */
5216 /* XXX: currently, since we do only one pass, we cannot track
5217 '&' operators, so we add only arrays */
5218 if (tcc_state->do_bounds_check && (type->t & VT_ARRAY)) {
5219 unsigned long *bounds_ptr;
5220 /* add padding between regions */
5221 loc--;
5222 /* then add local bound info */
5223 bounds_ptr = section_ptr_add(lbounds_section, 2 * sizeof(unsigned long));
5224 bounds_ptr[0] = addr;
5225 bounds_ptr[1] = size;
5226 }
5227 #endif
5228 if (v) {
5229 /* local variable */
5230 sym_push(v, type, r, addr);
5231 } else {
5232 /* push local reference */
5233 vset(type, r, addr);
5234 }
5235 } else {
5236 Sym *sym;
5237
5238 sym = NULL;
5239 if (v && scope == VT_CONST) {
5240 /* see if the symbol was already defined */
5241 sym = sym_find(v);
5242 if (sym) {
5243 if (!is_compatible_types(&sym->type, type))
5244 error("incompatible types for redefinition of '%s'",
5245 get_tok_str(v, NULL));
5246 if (sym->type.t & VT_EXTERN) {
5247 /* if the variable is extern, it was not allocated */
5248 sym->type.t &= ~VT_EXTERN;
5249 /* set array size if it was ommited in extern
5250 declaration */
5251 if ((sym->type.t & VT_ARRAY) &&
5252 sym->type.ref->c < 0 &&
5253 type->ref->c >= 0)
5254 sym->type.ref->c = type->ref->c;
5255 } else {
5256 /* we accept several definitions of the same
5257 global variable. this is tricky, because we
5258 must play with the SHN_COMMON type of the symbol */
5259 /* XXX: should check if the variable was already
5260 initialized. It is incorrect to initialized it
5261 twice */
5262 /* no init data, we won't add more to the symbol */
5263 if (!has_init)
5264 goto no_alloc;
5265 }
5266 }
5267 }
5268
5269 /* allocate symbol in corresponding section */
5270 sec = ad->section;
5271 if (!sec) {
5272 if (has_init)
5273 sec = data_section;
5274 else if (tcc_state->nocommon)
5275 sec = bss_section;
5276 }
5277 if (sec) {
5278 data_offset = sec->data_offset;
5279 data_offset = (data_offset + align - 1) & -align;
5280 addr = data_offset;
5281 /* very important to increment global pointer at this time
5282 because initializers themselves can create new initializers */
5283 data_offset += size;
5284 #ifdef CONFIG_TCC_BCHECK
5285 /* add padding if bound check */
5286 if (tcc_state->do_bounds_check)
5287 data_offset++;
5288 #endif
5289 sec->data_offset = data_offset;
5290 /* allocate section space to put the data */
5291 if (sec->sh_type != SHT_NOBITS &&
5292 data_offset > sec->data_allocated)
5293 section_realloc(sec, data_offset);
5294 /* align section if needed */
5295 if (align > sec->sh_addralign)
5296 sec->sh_addralign = align;
5297 } else {
5298 addr = 0; /* avoid warning */
5299 }
5300
5301 if (v) {
5302 if (scope != VT_CONST || !sym) {
5303 sym = sym_push(v, type, r | VT_SYM, 0);
5304 sym->asm_label = asm_label;
5305 }
5306 /* update symbol definition */
5307 if (sec) {
5308 put_extern_sym(sym, sec, addr, size);
5309 } else {
5310 ElfW(Sym) *esym;
5311 /* put a common area */
5312 put_extern_sym(sym, NULL, align, size);
5313 /* XXX: find a nicer way */
5314 esym = &((ElfW(Sym) *)symtab_section->data)[sym->c];
5315 esym->st_shndx = SHN_COMMON;
5316 }
5317 } else {
5318 CValue cval;
5319
5320 /* push global reference */
5321 sym = get_sym_ref(type, sec, addr, size);
5322 cval.ul = 0;
5323 vsetc(type, VT_CONST | VT_SYM, &cval);
5324 vtop->sym = sym;
5325 }
5326 /* patch symbol weakness */
5327 if (type->t & VT_WEAK)
5328 weaken_symbol(sym);
5329 #ifdef CONFIG_TCC_BCHECK
5330 /* handles bounds now because the symbol must be defined
5331 before for the relocation */
5332 if (tcc_state->do_bounds_check) {
5333 unsigned long *bounds_ptr;
5334
5335 greloc(bounds_section, sym, bounds_section->data_offset, R_DATA_PTR);
5336 /* then add global bound info */
5337 bounds_ptr = section_ptr_add(bounds_section, 2 * sizeof(long));
5338 bounds_ptr[0] = 0; /* relocated */
5339 bounds_ptr[1] = size;
5340 }
5341 #endif
5342 }
5343 if (has_init || (type->t & VT_VLA)) {
5344 decl_initializer(type, sec, addr, 1, 0);
5345 /* restore parse state if needed */
5346 if (init_str.str) {
5347 tok_str_free(init_str.str);
5348 restore_parse_state(&saved_parse_state);
5349 }
5350 /* patch flexible array member size back to -1, */
5351 /* for possible subsequent similar declarations */
5352 if (flexible_array)
5353 flexible_array->type.ref->c = -1;
5354 }
5355 no_alloc: ;
5356 }
5357
5358 static void put_func_debug(Sym *sym)
5359 {
5360 char buf[512];
5361
5362 /* stabs info */
5363 /* XXX: we put here a dummy type */
5364 snprintf(buf, sizeof(buf), "%s:%c1",
5365 funcname, sym->type.t & VT_STATIC ? 'f' : 'F');
5366 put_stabs_r(buf, N_FUN, 0, file->line_num, 0,
5367 cur_text_section, sym->c);
5368 /* //gr gdb wants a line at the function */
5369 put_stabn(N_SLINE, 0, file->line_num, 0);
5370 last_ind = 0;
5371 last_line_num = 0;
5372 }
5373
5374 /* parse an old style function declaration list */
5375 /* XXX: check multiple parameter */
5376 static void func_decl_list(Sym *func_sym)
5377 {
5378 AttributeDef ad;
5379 int v;
5380 Sym *s;
5381 CType btype, type;
5382
5383 /* parse each declaration */
5384 while (tok != '{' && tok != ';' && tok != ',' && tok != TOK_EOF &&
5385 tok != TOK_ASM1 && tok != TOK_ASM2 && tok != TOK_ASM3) {
5386 if (!parse_btype(&btype, &ad))
5387 expect("declaration list");
5388 if (((btype.t & VT_BTYPE) == VT_ENUM ||
5389 (btype.t & VT_BTYPE) == VT_STRUCT) &&
5390 tok == ';') {
5391 /* we accept no variable after */
5392 } else {
5393 for(;;) {
5394 type = btype;
5395 type_decl(&type, &ad, &v, TYPE_DIRECT);
5396 /* find parameter in function parameter list */
5397 s = func_sym->next;
5398 while (s != NULL) {
5399 if ((s->v & ~SYM_FIELD) == v)
5400 goto found;
5401 s = s->next;
5402 }
5403 error("declaration for parameter '%s' but no such parameter",
5404 get_tok_str(v, NULL));
5405 found:
5406 /* check that no storage specifier except 'register' was given */
5407 if (type.t & VT_STORAGE)
5408 error("storage class specified for '%s'", get_tok_str(v, NULL));
5409 convert_parameter_type(&type);
5410 /* we can add the type (NOTE: it could be local to the function) */
5411 s->type = type;
5412 /* accept other parameters */
5413 if (tok == ',')
5414 next();
5415 else
5416 break;
5417 }
5418 }
5419 skip(';');
5420 }
5421 }
5422
5423 /* parse a function defined by symbol 'sym' and generate its code in
5424 'cur_text_section' */
5425 static void gen_function(Sym *sym)
5426 {
5427 int saved_nocode_wanted = nocode_wanted;
5428 nocode_wanted = 0;
5429 ind = cur_text_section->data_offset;
5430 /* NOTE: we patch the symbol size later */
5431 put_extern_sym(sym, cur_text_section, ind, 0);
5432 funcname = get_tok_str(sym->v, NULL);
5433 func_ind = ind;
5434 /* put debug symbol */
5435 if (tcc_state->do_debug)
5436 put_func_debug(sym);
5437 /* push a dummy symbol to enable local sym storage */
5438 sym_push2(&local_stack, SYM_FIELD, 0, 0);
5439 gfunc_prolog(&sym->type);
5440 rsym = 0;
5441 block(NULL, NULL, NULL, NULL, 0, 0);
5442 gsym(rsym);
5443 gfunc_epilog();
5444 cur_text_section->data_offset = ind;
5445 label_pop(&global_label_stack, NULL);
5446 sym_pop(&local_stack, NULL); /* reset local stack */
5447 /* end of function */
5448 /* patch symbol size */
5449 ((ElfW(Sym) *)symtab_section->data)[sym->c].st_size =
5450 ind - func_ind;
5451 /* patch symbol weakness (this definition overrules any prototype) */
5452 if (sym->type.t & VT_WEAK)
5453 weaken_symbol(sym);
5454 if (tcc_state->do_debug) {
5455 put_stabn(N_FUN, 0, 0, ind - func_ind);
5456 }
5457 /* It's better to crash than to generate wrong code */
5458 cur_text_section = NULL;
5459 funcname = ""; /* for safety */
5460 func_vt.t = VT_VOID; /* for safety */
5461 ind = 0; /* for safety */
5462 nocode_wanted = saved_nocode_wanted;
5463 }
5464
5465 ST_FUNC void gen_inline_functions(void)
5466 {
5467 Sym *sym;
5468 int *str, inline_generated, i;
5469 struct InlineFunc *fn;
5470
5471 /* iterate while inline function are referenced */
5472 for(;;) {
5473 inline_generated = 0;
5474 for (i = 0; i < tcc_state->nb_inline_fns; ++i) {
5475 fn = tcc_state->inline_fns[i];
5476 sym = fn->sym;
5477 if (sym && sym->c) {
5478 /* the function was used: generate its code and
5479 convert it to a normal function */
5480 str = fn->token_str;
5481 fn->sym = NULL;
5482 if (file)
5483 strcpy(file->filename, fn->filename);
5484 sym->r = VT_SYM | VT_CONST;
5485 sym->type.t &= ~VT_INLINE;
5486
5487 macro_ptr = str;
5488 next();
5489 cur_text_section = text_section;
5490 gen_function(sym);
5491 macro_ptr = NULL; /* fail safe */
5492
5493 inline_generated = 1;
5494 }
5495 }
5496 if (!inline_generated)
5497 break;
5498 }
5499 for (i = 0; i < tcc_state->nb_inline_fns; ++i) {
5500 fn = tcc_state->inline_fns[i];
5501 str = fn->token_str;
5502 tok_str_free(str);
5503 }
5504 dynarray_reset(&tcc_state->inline_fns, &tcc_state->nb_inline_fns);
5505 }
5506
5507 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
5508 static int decl0(int l, int is_for_loop_init)
5509 {
5510 int v, has_init, r;
5511 CType type, btype;
5512 Sym *sym;
5513 AttributeDef ad;
5514
5515 while (1) {
5516 if (!parse_btype(&btype, &ad)) {
5517 if (is_for_loop_init)
5518 return 0;
5519 /* skip redundant ';' */
5520 /* XXX: find more elegant solution */
5521 if (tok == ';') {
5522 next();
5523 continue;
5524 }
5525 if (l == VT_CONST &&
5526 (tok == TOK_ASM1 || tok == TOK_ASM2 || tok == TOK_ASM3)) {
5527 /* global asm block */
5528 asm_global_instr();
5529 continue;
5530 }
5531 /* special test for old K&R protos without explicit int
5532 type. Only accepted when defining global data */
5533 if (l == VT_LOCAL || tok < TOK_DEFINE)
5534 break;
5535 btype.t = VT_INT;
5536 }
5537 if (((btype.t & VT_BTYPE) == VT_ENUM ||
5538 (btype.t & VT_BTYPE) == VT_STRUCT) &&
5539 tok == ';') {
5540 /* we accept no variable after */
5541 next();
5542 continue;
5543 }
5544 while (1) { /* iterate thru each declaration */
5545 char *asm_label; // associated asm label
5546 type = btype;
5547 type_decl(&type, &ad, &v, TYPE_DIRECT);
5548 #if 0
5549 {
5550 char buf[500];
5551 type_to_str(buf, sizeof(buf), t, get_tok_str(v, NULL));
5552 printf("type = '%s'\n", buf);
5553 }
5554 #endif
5555 if ((type.t & VT_BTYPE) == VT_FUNC) {
5556 if ((type.t & VT_STATIC) && (l == VT_LOCAL)) {
5557 error("function without file scope cannot be static");
5558 }
5559 /* if old style function prototype, we accept a
5560 declaration list */
5561 sym = type.ref;
5562 if (sym->c == FUNC_OLD)
5563 func_decl_list(sym);
5564 }
5565
5566 asm_label = NULL;
5567 if (gnu_ext && (tok == TOK_ASM1 || tok == TOK_ASM2 || tok == TOK_ASM3)) {
5568 CString astr;
5569
5570 asm_label_instr(&astr);
5571 asm_label = tcc_strdup(astr.data);
5572 cstr_free(&astr);
5573
5574 /* parse one last attribute list, after asm label */
5575 parse_attribute(&ad);
5576 }
5577
5578 if (ad.weak)
5579 type.t |= VT_WEAK;
5580 #ifdef TCC_TARGET_PE
5581 if (ad.func_import)
5582 type.t |= VT_IMPORT;
5583 if (ad.func_export)
5584 type.t |= VT_EXPORT;
5585 #endif
5586 if (tok == '{') {
5587 if (l == VT_LOCAL)
5588 error("cannot use local functions");
5589 if ((type.t & VT_BTYPE) != VT_FUNC)
5590 expect("function definition");
5591
5592 /* reject abstract declarators in function definition */
5593 sym = type.ref;
5594 while ((sym = sym->next) != NULL)
5595 if (!(sym->v & ~SYM_FIELD))
5596 expect("identifier");
5597
5598 /* XXX: cannot do better now: convert extern line to static inline */
5599 if ((type.t & (VT_EXTERN | VT_INLINE)) == (VT_EXTERN | VT_INLINE))
5600 type.t = (type.t & ~VT_EXTERN) | VT_STATIC;
5601
5602 sym = sym_find(v);
5603 if (sym) {
5604 if ((sym->type.t & VT_BTYPE) != VT_FUNC)
5605 goto func_error1;
5606
5607 r = sym->type.ref->r;
5608 /* use func_call from prototype if not defined */
5609 if (FUNC_CALL(r) != FUNC_CDECL
5610 && FUNC_CALL(type.ref->r) == FUNC_CDECL)
5611 FUNC_CALL(type.ref->r) = FUNC_CALL(r);
5612
5613 /* use export from prototype */
5614 if (FUNC_EXPORT(r))
5615 FUNC_EXPORT(type.ref->r) = 1;
5616
5617 /* use static from prototype */
5618 if (sym->type.t & VT_STATIC)
5619 type.t = (type.t & ~VT_EXTERN) | VT_STATIC;
5620
5621 if (!is_compatible_types(&sym->type, &type)) {
5622 func_error1:
5623 error("incompatible types for redefinition of '%s'",
5624 get_tok_str(v, NULL));
5625 }
5626 /* if symbol is already defined, then put complete type */
5627 sym->type = type;
5628 } else {
5629 /* put function symbol */
5630 sym = global_identifier_push(v, type.t, 0);
5631 sym->type.ref = type.ref;
5632 }
5633
5634 /* static inline functions are just recorded as a kind
5635 of macro. Their code will be emitted at the end of
5636 the compilation unit only if they are used */
5637 if ((type.t & (VT_INLINE | VT_STATIC)) ==
5638 (VT_INLINE | VT_STATIC)) {
5639 TokenString func_str;
5640 int block_level;
5641 struct InlineFunc *fn;
5642 const char *filename;
5643
5644 tok_str_new(&func_str);
5645
5646 block_level = 0;
5647 for(;;) {
5648 int t;
5649 if (tok == TOK_EOF)
5650 error("unexpected end of file");
5651 tok_str_add_tok(&func_str);
5652 t = tok;
5653 next();
5654 if (t == '{') {
5655 block_level++;
5656 } else if (t == '}') {
5657 block_level--;
5658 if (block_level == 0)
5659 break;
5660 }
5661 }
5662 tok_str_add(&func_str, -1);
5663 tok_str_add(&func_str, 0);
5664 filename = file ? file->filename : "";
5665 fn = tcc_malloc(sizeof *fn + strlen(filename));
5666 strcpy(fn->filename, filename);
5667 fn->sym = sym;
5668 fn->token_str = func_str.str;
5669 dynarray_add((void ***)&tcc_state->inline_fns, &tcc_state->nb_inline_fns, fn);
5670
5671 } else {
5672 /* compute text section */
5673 cur_text_section = ad.section;
5674 if (!cur_text_section)
5675 cur_text_section = text_section;
5676 sym->r = VT_SYM | VT_CONST;
5677 gen_function(sym);
5678 }
5679 break;
5680 } else {
5681 if (btype.t & VT_TYPEDEF) {
5682 /* save typedefed type */
5683 /* XXX: test storage specifiers ? */
5684 sym = sym_push(v, &type, INT_ATTR(&ad), 0);
5685 sym->type.t |= VT_TYPEDEF;
5686 } else {
5687 r = 0;
5688 if ((type.t & VT_BTYPE) == VT_FUNC) {
5689 /* external function definition */
5690 /* specific case for func_call attribute */
5691 type.ref->r = INT_ATTR(&ad);
5692 } else if (!(type.t & VT_ARRAY)) {
5693 /* not lvalue if array */
5694 r |= lvalue_type(type.t);
5695 }
5696 has_init = (tok == '=');
5697 if (has_init && (type.t & VT_VLA))
5698 error("Variable length array cannot be initialized");
5699 if ((btype.t & VT_EXTERN) || ((type.t & VT_BTYPE) == VT_FUNC) ||
5700 ((type.t & VT_ARRAY) && (type.t & VT_STATIC) &&
5701 !has_init && l == VT_CONST && type.ref->c < 0)) {
5702 /* external variable or function */
5703 /* NOTE: as GCC, uninitialized global static
5704 arrays of null size are considered as
5705 extern */
5706 sym = external_sym(v, &type, r, asm_label);
5707
5708 if (type.t & VT_WEAK)
5709 weaken_symbol(sym);
5710
5711 if (ad.alias_target) {
5712 Section tsec;
5713 Elf32_Sym *esym;
5714 Sym *alias_target;
5715
5716 alias_target = sym_find(ad.alias_target);
5717 if (!alias_target || !alias_target->c)
5718 error("unsupported forward __alias__ attribute");
5719 esym = &((Elf32_Sym *)symtab_section->data)[alias_target->c];
5720 tsec.sh_num = esym->st_shndx;
5721 put_extern_sym2(sym, &tsec, esym->st_value, esym->st_size, 0);
5722 }
5723 } else {
5724 type.t |= (btype.t & VT_STATIC); /* Retain "static". */
5725 if (type.t & VT_STATIC)
5726 r |= VT_CONST;
5727 else
5728 r |= l;
5729 if (has_init)
5730 next();
5731 decl_initializer_alloc(&type, &ad, r, has_init, v, asm_label, l);
5732 }
5733 }
5734 if (tok != ',') {
5735 if (is_for_loop_init)
5736 return 1;
5737 skip(';');
5738 break;
5739 }
5740 next();
5741 }
5742 ad.aligned = 0;
5743 }
5744 }
5745 return 0;
5746 }
5747
5748 ST_FUNC void decl(int l)
5749 {
5750 decl0(l, 0);
5751 }
tinycc fork to help me test changes before commit to mob