?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Improved variable length array support.
[tinycc.git] / tccgen.c
blobc5c41de391f130ec41f124919b942460a6f13c3a
1 /*
2 * TCC - Tiny C Compiler
3 *
4 * Copyright (c) 2001-2004 Fabrice Bellard
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #include "tcc.h"
22
23 /********************************************************/
24 /* global variables */
25
26 /* loc : local variable index
27 ind : output code index
28 rsym: return symbol
29 anon_sym: anonymous symbol index
30 */
31 ST_DATA int rsym, anon_sym, ind, loc;
32
33 ST_DATA Section *text_section, *data_section, *bss_section; /* predefined sections */
34 ST_DATA Section *cur_text_section; /* current section where function code is generated */
35 #ifdef CONFIG_TCC_ASM
36 ST_DATA Section *last_text_section; /* to handle .previous asm directive */
37 #endif
38 #ifdef CONFIG_TCC_BCHECK
39 /* bound check related sections */
40 ST_DATA Section *bounds_section; /* contains global data bound description */
41 ST_DATA Section *lbounds_section; /* contains local data bound description */
42 #endif
43 /* symbol sections */
44 ST_DATA Section *symtab_section, *strtab_section;
45 /* debug sections */
46 ST_DATA Section *stab_section, *stabstr_section;
47 ST_DATA Sym *sym_free_first;
48 ST_DATA void **sym_pools;
49 ST_DATA int nb_sym_pools;
50
51 ST_DATA Sym *global_stack;
52 ST_DATA Sym *local_stack;
53 ST_DATA Sym *scope_stack_bottom;
54 ST_DATA Sym *define_stack;
55 ST_DATA Sym *global_label_stack;
56 ST_DATA Sym *local_label_stack;
57
58 ST_DATA int vla_sp_loc_tmp; /* vla_sp_loc is set to this when the value won't be needed later */
59 ST_DATA int vla_sp_root_loc; /* vla_sp_loc for SP before any VLAs were pushed */
60 ST_DATA int *vla_sp_loc; /* Pointer to variable holding location to store stack pointer on the stack when modifying stack pointer */
61 ST_DATA int vla_flags; /* VLA_* flags */
62
63 ST_DATA SValue __vstack[1+VSTACK_SIZE], *vtop;
64
65 ST_DATA int const_wanted; /* true if constant wanted */
66 ST_DATA int nocode_wanted; /* true if no code generation wanted for an expression */
67 ST_DATA int global_expr; /* true if compound literals must be allocated globally (used during initializers parsing */
68 ST_DATA CType func_vt; /* current function return type (used by return instruction) */
69 ST_DATA int func_vc;
70 ST_DATA int last_line_num, last_ind, func_ind; /* debug last line number and pc */
71 ST_DATA char *funcname;
72
73 ST_DATA CType char_pointer_type, func_old_type, int_type, size_type;
74
75 /* ------------------------------------------------------------------------- */
76 static void gen_cast(CType *type);
77 static inline CType *pointed_type(CType *type);
78 static int is_compatible_types(CType *type1, CType *type2);
79 static int parse_btype(CType *type, AttributeDef *ad);
80 static void type_decl(CType *type, AttributeDef *ad, int *v, int td);
81 static void parse_expr_type(CType *type);
82 static void decl_initializer(CType *type, Section *sec, unsigned long c, int first, int size_only);
83 static void block(int *bsym, int *csym, int *case_sym, int *def_sym, int case_reg, int is_expr);
84 static void decl_initializer_alloc(CType *type, AttributeDef *ad, int r, int has_init, int v, char *asm_label, int scope);
85 static int decl0(int l, int is_for_loop_init);
86 static void expr_eq(void);
87 static void unary_type(CType *type);
88 static void vla_runtime_type_size(CType *type, int *a);
89 static void vla_sp_save(void);
90 static int is_compatible_parameter_types(CType *type1, CType *type2);
91 static void expr_type(CType *type);
92
93 ST_INLN int is_float(int t)
94 {
95 int bt;
96 bt = t & VT_BTYPE;
97 return bt == VT_LDOUBLE || bt == VT_DOUBLE || bt == VT_FLOAT || bt == VT_QFLOAT;
98 }
99
100 /* we use our own 'finite' function to avoid potential problems with
101 non standard math libs */
102 /* XXX: endianness dependent */
103 ST_FUNC int ieee_finite(double d)
104 {
105 int *p = (int *)&d;
106 return ((unsigned)((p[1] | 0x800fffff) + 1)) >> 31;
107 }
108
109 ST_FUNC void test_lvalue(void)
110 {
111 if (!(vtop->r & VT_LVAL))
112 expect("lvalue");
113 }
114
115 /* ------------------------------------------------------------------------- */
116 /* symbol allocator */
117 static Sym *__sym_malloc(void)
118 {
119 Sym *sym_pool, *sym, *last_sym;
120 int i;
121
122 sym_pool = tcc_malloc(SYM_POOL_NB * sizeof(Sym));
123 dynarray_add(&sym_pools, &nb_sym_pools, sym_pool);
124
125 last_sym = sym_free_first;
126 sym = sym_pool;
127 for(i = 0; i < SYM_POOL_NB; i++) {
128 sym->next = last_sym;
129 last_sym = sym;
130 sym++;
131 }
132 sym_free_first = last_sym;
133 return last_sym;
134 }
135
136 static inline Sym *sym_malloc(void)
137 {
138 Sym *sym;
139 sym = sym_free_first;
140 if (!sym)
141 sym = __sym_malloc();
142 sym_free_first = sym->next;
143 return sym;
144 }
145
146 ST_INLN void sym_free(Sym *sym)
147 {
148 sym->next = sym_free_first;
149 tcc_free(sym->asm_label);
150 sym_free_first = sym;
151 }
152
153 /* push, without hashing */
154 ST_FUNC Sym *sym_push2(Sym **ps, int v, int t, long c)
155 {
156 Sym *s;
157 if (ps == &local_stack) {
158 for (s = *ps; s && s != scope_stack_bottom; s = s->prev)
159 if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM && s->v == v)
160 tcc_error("incompatible types for redefinition of '%s'",
161 get_tok_str(v, NULL));
162 }
163 s = *ps;
164 s = sym_malloc();
165 s->asm_label = NULL;
166 s->v = v;
167 s->type.t = t;
168 s->type.ref = NULL;
169 #ifdef _WIN64
170 s->d = NULL;
171 #endif
172 s->c = c;
173 s->next = NULL;
174 /* add in stack */
175 s->prev = *ps;
176 *ps = s;
177 return s;
178 }
179
180 /* find a symbol and return its associated structure. 's' is the top
181 of the symbol stack */
182 ST_FUNC Sym *sym_find2(Sym *s, int v)
183 {
184 while (s) {
185 if (s->v == v)
186 return s;
187 s = s->prev;
188 }
189 return NULL;
190 }
191
192 /* structure lookup */
193 ST_INLN Sym *struct_find(int v)
194 {
195 v -= TOK_IDENT;
196 if ((unsigned)v >= (unsigned)(tok_ident - TOK_IDENT))
197 return NULL;
198 return table_ident[v]->sym_struct;
199 }
200
201 /* find an identifier */
202 ST_INLN Sym *sym_find(int v)
203 {
204 v -= TOK_IDENT;
205 if ((unsigned)v >= (unsigned)(tok_ident - TOK_IDENT))
206 return NULL;
207 return table_ident[v]->sym_identifier;
208 }
209
210 /* push a given symbol on the symbol stack */
211 ST_FUNC Sym *sym_push(int v, CType *type, int r, int c)
212 {
213 Sym *s, **ps;
214 TokenSym *ts;
215
216 if (local_stack)
217 ps = &local_stack;
218 else
219 ps = &global_stack;
220 s = sym_push2(ps, v, type->t, c);
221 s->type.ref = type->ref;
222 s->r = r;
223 /* don't record fields or anonymous symbols */
224 /* XXX: simplify */
225 if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM) {
226 /* record symbol in token array */
227 ts = table_ident[(v & ~SYM_STRUCT) - TOK_IDENT];
228 if (v & SYM_STRUCT)
229 ps = &ts->sym_struct;
230 else
231 ps = &ts->sym_identifier;
232 s->prev_tok = *ps;
233 *ps = s;
234 }
235 return s;
236 }
237
238 /* push a global identifier */
239 ST_FUNC Sym *global_identifier_push(int v, int t, int c)
240 {
241 Sym *s, **ps;
242 s = sym_push2(&global_stack, v, t, c);
243 /* don't record anonymous symbol */
244 if (v < SYM_FIRST_ANOM) {
245 ps = &table_ident[v - TOK_IDENT]->sym_identifier;
246 /* modify the top most local identifier, so that
247 sym_identifier will point to 's' when popped */
248 while (*ps != NULL)
249 ps = &(*ps)->prev_tok;
250 s->prev_tok = NULL;
251 *ps = s;
252 }
253 return s;
254 }
255
256 /* pop symbols until top reaches 'b' */
257 ST_FUNC void sym_pop(Sym **ptop, Sym *b)
258 {
259 Sym *s, *ss, **ps;
260 TokenSym *ts;
261 int v;
262
263 s = *ptop;
264 while(s != b) {
265 ss = s->prev;
266 v = s->v;
267 /* remove symbol in token array */
268 /* XXX: simplify */
269 if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM) {
270 ts = table_ident[(v & ~SYM_STRUCT) - TOK_IDENT];
271 if (v & SYM_STRUCT)
272 ps = &ts->sym_struct;
273 else
274 ps = &ts->sym_identifier;
275 *ps = s->prev_tok;
276 }
277 sym_free(s);
278 s = ss;
279 }
280 *ptop = b;
281 }
282
283 static void weaken_symbol(Sym *sym)
284 {
285 sym->type.t |= VT_WEAK;
286 if (sym->c > 0) {
287 int esym_type;
288 ElfW(Sym) *esym;
289
290 esym = &((ElfW(Sym) *)symtab_section->data)[sym->c];
291 esym_type = ELFW(ST_TYPE)(esym->st_info);
292 esym->st_info = ELFW(ST_INFO)(STB_WEAK, esym_type);
293 }
294 }
295
296 /* ------------------------------------------------------------------------- */
297
298 ST_FUNC void swap(int *p, int *q)
299 {
300 int t;
301 t = *p;
302 *p = *q;
303 *q = t;
304 }
305
306 static void vsetc(CType *type, int r, CValue *vc)
307 {
308 int v;
309
310 if (vtop >= vstack + (VSTACK_SIZE - 1))
311 tcc_error("memory full");
312 /* cannot let cpu flags if other instruction are generated. Also
313 avoid leaving VT_JMP anywhere except on the top of the stack
314 because it would complicate the code generator. */
315 if (vtop >= vstack) {
316 v = vtop->r & VT_VALMASK;
317 if (v == VT_CMP || (v & ~1) == VT_JMP)
318 gv(RC_INT);
319 }
320 vtop++;
321 vtop->type = *type;
322 vtop->r = r;
323 vtop->r2 = VT_CONST;
324 vtop->c = *vc;
325 }
326
327 /* push constant of type "type" with useless value */
328 void vpush(CType *type)
329 {
330 CValue cval;
331 vsetc(type, VT_CONST, &cval);
332 }
333
334 /* push integer constant */
335 ST_FUNC void vpushi(int v)
336 {
337 CValue cval;
338 cval.i = v;
339 vsetc(&int_type, VT_CONST, &cval);
340 }
341
342 /* push a pointer sized constant */
343 static void vpushs(long long v)
344 {
345 CValue cval;
346 if (PTR_SIZE == 4)
347 cval.i = (int)v;
348 else
349 cval.ull = v;
350 vsetc(&size_type, VT_CONST, &cval);
351 }
352
353 /* push arbitrary 64bit constant */
354 void vpush64(int ty, unsigned long long v)
355 {
356 CValue cval;
357 CType ctype;
358 ctype.t = ty;
359 ctype.ref = NULL;
360 cval.ull = v;
361 vsetc(&ctype, VT_CONST, &cval);
362 }
363
364 /* push long long constant */
365 static inline void vpushll(long long v)
366 {
367 vpush64(VT_LLONG, v);
368 }
369
370 /* Return a static symbol pointing to a section */
371 ST_FUNC Sym *get_sym_ref(CType *type, Section *sec, unsigned long offset, unsigned long size)
372 {
373 int v;
374 Sym *sym;
375
376 v = anon_sym++;
377 sym = global_identifier_push(v, type->t | VT_STATIC, 0);
378 sym->type.ref = type->ref;
379 sym->r = VT_CONST | VT_SYM;
380 put_extern_sym(sym, sec, offset, size);
381 return sym;
382 }
383
384 /* push a reference to a section offset by adding a dummy symbol */
385 static void vpush_ref(CType *type, Section *sec, unsigned long offset, unsigned long size)
386 {
387 CValue cval;
388
389 cval.ul = 0;
390 vsetc(type, VT_CONST | VT_SYM, &cval);
391 vtop->sym = get_sym_ref(type, sec, offset, size);
392 }
393
394 /* define a new external reference to a symbol 'v' of type 'u' */
395 ST_FUNC Sym *external_global_sym(int v, CType *type, int r)
396 {
397 Sym *s;
398
399 s = sym_find(v);
400 if (!s) {
401 /* push forward reference */
402 s = global_identifier_push(v, type->t | VT_EXTERN, 0);
403 s->type.ref = type->ref;
404 s->r = r | VT_CONST | VT_SYM;
405 }
406 return s;
407 }
408
409 /* define a new external reference to a symbol 'v' with alternate asm
410 name 'asm_label' of type 'u'. 'asm_label' is equal to NULL if there
411 is no alternate name (most cases) */
412 static Sym *external_sym(int v, CType *type, int r, char *asm_label)
413 {
414 Sym *s;
415
416 s = sym_find(v);
417 if (!s) {
418 /* push forward reference */
419 s = sym_push(v, type, r | VT_CONST | VT_SYM, 0);
420 s->asm_label = asm_label;
421 s->type.t |= VT_EXTERN;
422 } else if (s->type.ref == func_old_type.ref) {
423 s->type.ref = type->ref;
424 s->r = r | VT_CONST | VT_SYM;
425 s->type.t |= VT_EXTERN;
426 } else if (!is_compatible_types(&s->type, type)) {
427 tcc_error("incompatible types for redefinition of '%s'",
428 get_tok_str(v, NULL));
429 }
430 return s;
431 }
432
433 /* push a reference to global symbol v */
434 ST_FUNC void vpush_global_sym(CType *type, int v)
435 {
436 Sym *sym;
437 CValue cval;
438
439 sym = external_global_sym(v, type, 0);
440 cval.ul = 0;
441 vsetc(type, VT_CONST | VT_SYM, &cval);
442 vtop->sym = sym;
443 }
444
445 ST_FUNC void vset(CType *type, int r, int v)
446 {
447 CValue cval;
448
449 cval.i = v;
450 vsetc(type, r, &cval);
451 }
452
453 static void vseti(int r, int v)
454 {
455 CType type;
456 type.t = VT_INT;
457 type.ref = 0;
458 vset(&type, r, v);
459 }
460
461 ST_FUNC void vswap(void)
462 {
463 SValue tmp;
464 /* cannot let cpu flags if other instruction are generated. Also
465 avoid leaving VT_JMP anywhere except on the top of the stack
466 because it would complicate the code generator. */
467 if (vtop >= vstack) {
468 int v = vtop->r & VT_VALMASK;
469 if (v == VT_CMP || (v & ~1) == VT_JMP)
470 gv(RC_INT);
471 }
472 tmp = vtop[0];
473 vtop[0] = vtop[-1];
474 vtop[-1] = tmp;
475
476 /* XXX: +2% overall speed possible with optimized memswap
477 *
478 * memswap(&vtop[0], &vtop[1], sizeof *vtop);
479 */
480 }
481
482 ST_FUNC void vpushv(SValue *v)
483 {
484 if (vtop >= vstack + (VSTACK_SIZE - 1))
485 tcc_error("memory full");
486 vtop++;
487 *vtop = *v;
488 }
489
490 static void vdup(void)
491 {
492 vpushv(vtop);
493 }
494
495 /* save r to the memory stack, and mark it as being free */
496 ST_FUNC void save_reg(int r)
497 {
498 int l, saved, size, align;
499 SValue *p, sv;
500 CType *type;
501
502 /* modify all stack values */
503 saved = 0;
504 l = 0;
505 for(p=vstack;p<=vtop;p++) {
506 if ((p->r & VT_VALMASK) == r ||
507 ((p->type.t & VT_BTYPE) == VT_LLONG && (p->r2 & VT_VALMASK) == r)) {
508 /* must save value on stack if not already done */
509 if (!saved) {
510 /* NOTE: must reload 'r' because r might be equal to r2 */
511 r = p->r & VT_VALMASK;
512 /* store register in the stack */
513 type = &p->type;
514 if ((p->r & VT_LVAL) ||
515 (!is_float(type->t) && (type->t & VT_BTYPE) != VT_LLONG))
516 #ifdef TCC_TARGET_X86_64
517 type = &char_pointer_type;
518 #else
519 type = &int_type;
520 #endif
521 size = type_size(type, &align);
522 loc = (loc - size) & -align;
523 sv.type.t = type->t;
524 sv.r = VT_LOCAL | VT_LVAL;
525 sv.c.ul = loc;
526 store(r, &sv);
527 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
528 /* x86 specific: need to pop fp register ST0 if saved */
529 if (r == TREG_ST0) {
530 o(0xd8dd); /* fstp %st(0) */
531 }
532 #endif
533 #ifndef TCC_TARGET_X86_64
534 /* special long long case */
535 if ((type->t & VT_BTYPE) == VT_LLONG) {
536 sv.c.ul += 4;
537 store(p->r2, &sv);
538 }
539 #endif
540 l = loc;
541 saved = 1;
542 }
543 /* mark that stack entry as being saved on the stack */
544 if (p->r & VT_LVAL) {
545 /* also clear the bounded flag because the
546 relocation address of the function was stored in
547 p->c.ul */
548 p->r = (p->r & ~(VT_VALMASK | VT_BOUNDED)) | VT_LLOCAL;
549 } else {
550 p->r = lvalue_type(p->type.t) | VT_LOCAL;
551 }
552 p->r2 = VT_CONST;
553 p->c.ul = l;
554 }
555 }
556 }
557
558 #ifdef TCC_TARGET_ARM
559 /* find a register of class 'rc2' with at most one reference on stack.
560 * If none, call get_reg(rc) */
561 ST_FUNC int get_reg_ex(int rc, int rc2)
562 {
563 int r;
564 SValue *p;
565
566 for(r=0;r<NB_REGS;r++) {
567 if (reg_classes[r] & rc2) {
568 int n;
569 n=0;
570 for(p = vstack; p <= vtop; p++) {
571 if ((p->r & VT_VALMASK) == r ||
572 (p->r2 & VT_VALMASK) == r)
573 n++;
574 }
575 if (n <= 1)
576 return r;
577 }
578 }
579 return get_reg(rc);
580 }
581 #endif
582
583 /* find a free register of class 'rc'. If none, save one register */
584 ST_FUNC int get_reg(int rc)
585 {
586 int r;
587 SValue *p;
588
589 /* find a free register */
590 for(r=0;r<NB_REGS;r++) {
591 if (reg_classes[r] & rc) {
592 for(p=vstack;p<=vtop;p++) {
593 if ((p->r & VT_VALMASK) == r ||
594 (p->r2 & VT_VALMASK) == r)
595 goto notfound;
596 }
597 return r;
598 }
599 notfound: ;
600 }
601
602 /* no register left : free the first one on the stack (VERY
603 IMPORTANT to start from the bottom to ensure that we don't
604 spill registers used in gen_opi()) */
605 for(p=vstack;p<=vtop;p++) {
606 /* look at second register (if long long) */
607 r = p->r2 & VT_VALMASK;
608 if (r < VT_CONST && (reg_classes[r] & rc))
609 goto save_found;
610 r = p->r & VT_VALMASK;
611 if (r < VT_CONST && (reg_classes[r] & rc)) {
612 save_found:
613 save_reg(r);
614 return r;
615 }
616 }
617 /* Should never comes here */
618 return -1;
619 }
620
621 /* save registers up to (vtop - n) stack entry */
622 ST_FUNC void save_regs(int n)
623 {
624 int r;
625 SValue *p, *p1;
626 p1 = vtop - n;
627 for(p = vstack;p <= p1; p++) {
628 r = p->r & VT_VALMASK;
629 if (r < VT_CONST) {
630 save_reg(r);
631 }
632 }
633 }
634
635 /* move register 's' (of type 't') to 'r', and flush previous value of r to memory
636 if needed */
637 static void move_reg(int r, int s, int t)
638 {
639 SValue sv;
640
641 if (r != s) {
642 save_reg(r);
643 sv.type.t = t;
644 sv.type.ref = NULL;
645 sv.r = s;
646 sv.c.ul = 0;
647 load(r, &sv);
648 }
649 }
650
651 /* get address of vtop (vtop MUST BE an lvalue) */
652 static void gaddrof(void)
653 {
654 if (vtop->r & VT_REF)
655 gv(RC_INT);
656 vtop->r &= ~VT_LVAL;
657 /* tricky: if saved lvalue, then we can go back to lvalue */
658 if ((vtop->r & VT_VALMASK) == VT_LLOCAL)
659 vtop->r = (vtop->r & ~(VT_VALMASK | VT_LVAL_TYPE)) | VT_LOCAL | VT_LVAL;
660
661
662 }
663
664 #ifdef CONFIG_TCC_BCHECK
665 /* generate lvalue bound code */
666 static void gbound(void)
667 {
668 int lval_type;
669 CType type1;
670
671 vtop->r &= ~VT_MUSTBOUND;
672 /* if lvalue, then use checking code before dereferencing */
673 if (vtop->r & VT_LVAL) {
674 /* if not VT_BOUNDED value, then make one */
675 if (!(vtop->r & VT_BOUNDED)) {
676 lval_type = vtop->r & (VT_LVAL_TYPE | VT_LVAL);
677 /* must save type because we must set it to int to get pointer */
678 type1 = vtop->type;
679 vtop->type.t = VT_INT;
680 gaddrof();
681 vpushi(0);
682 gen_bounded_ptr_add();
683 vtop->r |= lval_type;
684 vtop->type = type1;
685 }
686 /* then check for dereferencing */
687 gen_bounded_ptr_deref();
688 }
689 }
690 #endif
691
692 /* store vtop a register belonging to class 'rc'. lvalues are
693 converted to values. Cannot be used if cannot be converted to
694 register value (such as structures). */
695 ST_FUNC int gv(int rc)
696 {
697 int r, bit_pos, bit_size, size, align, i;
698 int rc2;
699
700 /* NOTE: get_reg can modify vstack[] */
701 if (vtop->type.t & VT_BITFIELD) {
702 CType type;
703 int bits = 32;
704 bit_pos = (vtop->type.t >> VT_STRUCT_SHIFT) & 0x3f;
705 bit_size = (vtop->type.t >> (VT_STRUCT_SHIFT + 6)) & 0x3f;
706 /* remove bit field info to avoid loops */
707 vtop->type.t &= ~(VT_BITFIELD | (-1 << VT_STRUCT_SHIFT));
708 /* cast to int to propagate signedness in following ops */
709 if ((vtop->type.t & VT_BTYPE) == VT_LLONG) {
710 type.t = VT_LLONG;
711 bits = 64;
712 } else
713 type.t = VT_INT;
714 if((vtop->type.t & VT_UNSIGNED) ||
715 (vtop->type.t & VT_BTYPE) == VT_BOOL)
716 type.t |= VT_UNSIGNED;
717 gen_cast(&type);
718 /* generate shifts */
719 vpushi(bits - (bit_pos + bit_size));
720 gen_op(TOK_SHL);
721 vpushi(bits - bit_size);
722 /* NOTE: transformed to SHR if unsigned */
723 gen_op(TOK_SAR);
724 r = gv(rc);
725 } else {
726 if (is_float(vtop->type.t) &&
727 (vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
728 Sym *sym;
729 int *ptr;
730 unsigned long offset;
731 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
732 CValue check;
733 #endif
734
735 /* XXX: unify with initializers handling ? */
736 /* CPUs usually cannot use float constants, so we store them
737 generically in data segment */
738 size = type_size(&vtop->type, &align);
739 offset = (data_section->data_offset + align - 1) & -align;
740 data_section->data_offset = offset;
741 /* XXX: not portable yet */
742 #if defined(__i386__) || defined(__x86_64__)
743 /* Zero pad x87 tenbyte long doubles */
744 if (size == LDOUBLE_SIZE) {
745 vtop->c.tab[2] &= 0xffff;
746 #if LDOUBLE_SIZE == 16
747 vtop->c.tab[3] = 0;
748 #endif
749 }
750 #endif
751 ptr = section_ptr_add(data_section, size);
752 size = size >> 2;
753 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
754 check.d = 1;
755 if(check.tab[0])
756 for(i=0;i<size;i++)
757 ptr[i] = vtop->c.tab[size-1-i];
758 else
759 #endif
760 for(i=0;i<size;i++)
761 ptr[i] = vtop->c.tab[i];
762 sym = get_sym_ref(&vtop->type, data_section, offset, size << 2);
763 vtop->r |= VT_LVAL | VT_SYM;
764 vtop->sym = sym;
765 vtop->c.ul = 0;
766 }
767 #ifdef CONFIG_TCC_BCHECK
768 if (vtop->r & VT_MUSTBOUND)
769 gbound();
770 #endif
771
772 r = vtop->r & VT_VALMASK;
773 rc2 = (rc & RC_FLOAT) ? RC_FLOAT : RC_INT;
774 if (rc == RC_IRET)
775 rc2 = RC_LRET;
776 #ifdef TCC_TARGET_X86_64
777 else if (rc == RC_FRET)
778 rc2 = RC_QRET;
779 #endif
780
781 /* need to reload if:
782 - constant
783 - lvalue (need to dereference pointer)
784 - already a register, but not in the right class */
785 if (r >= VT_CONST
786 || (vtop->r & VT_LVAL)
787 || !(reg_classes[r] & rc)
788 #ifdef TCC_TARGET_X86_64
789 || ((vtop->type.t & VT_BTYPE) == VT_QLONG && !(reg_classes[vtop->r2] & rc2))
790 || ((vtop->type.t & VT_BTYPE) == VT_QFLOAT && !(reg_classes[vtop->r2] & rc2))
791 #else
792 || ((vtop->type.t & VT_BTYPE) == VT_LLONG && !(reg_classes[vtop->r2] & rc2))
793 #endif
794 )
795 {
796 r = get_reg(rc);
797 #ifdef TCC_TARGET_X86_64
798 if (((vtop->type.t & VT_BTYPE) == VT_QLONG) || ((vtop->type.t & VT_BTYPE) == VT_QFLOAT)) {
799 int addr_type = VT_LLONG, load_size = 8, load_type = ((vtop->type.t & VT_BTYPE) == VT_QLONG) ? VT_LLONG : VT_DOUBLE;
800 #else
801 if ((vtop->type.t & VT_BTYPE) == VT_LLONG) {
802 int addr_type = VT_INT, load_size = 4, load_type = VT_INT;
803 #endif
804 int r2, original_type;
805 unsigned long long ll;
806 original_type = vtop->type.t;
807 /* two register type load : expand to two words
808 temporarily */
809 #ifndef TCC_TARGET_X86_64
810 if ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
811 /* load constant */
812 ll = vtop->c.ull;
813 vtop->c.ui = ll; /* first word */
814 load(r, vtop);
815 vtop->r = r; /* save register value */
816 vpushi(ll >> 32); /* second word */
817 } else
818 #endif
819 if (r >= VT_CONST || /* XXX: test to VT_CONST incorrect ? */
820 (vtop->r & VT_LVAL)) {
821 /* We do not want to modifier the long long
822 pointer here, so the safest (and less
823 efficient) is to save all the other registers
824 in the stack. XXX: totally inefficient. */
825 save_regs(1);
826 /* load from memory */
827 vtop->type.t = load_type;
828 load(r, vtop);
829 vdup();
830 vtop[-1].r = r; /* save register value */
831 /* increment pointer to get second word */
832 vtop->type.t = addr_type;
833 gaddrof();
834 vpushi(load_size);
835 gen_op('+');
836 vtop->r |= VT_LVAL;
837 vtop->type.t = load_type;
838 } else {
839 /* move registers */
840 load(r, vtop);
841 vdup();
842 vtop[-1].r = r; /* save register value */
843 vtop->r = vtop[-1].r2;
844 }
845 /* Allocate second register. Here we rely on the fact that
846 get_reg() tries first to free r2 of an SValue. */
847 r2 = get_reg(rc2);
848 load(r2, vtop);
849 vpop();
850 /* write second register */
851 vtop->r2 = r2;
852 vtop->type.t = original_type;
853 } else if ((vtop->r & VT_LVAL) && !is_float(vtop->type.t)) {
854 int t1, t;
855 /* lvalue of scalar type : need to use lvalue type
856 because of possible cast */
857 t = vtop->type.t;
858 t1 = t;
859 /* compute memory access type */
860 if (vtop->r & VT_REF)
861 #ifdef TCC_TARGET_X86_64
862 t = VT_PTR;
863 #else
864 t = VT_INT;
865 #endif
866 else if (vtop->r & VT_LVAL_BYTE)
867 t = VT_BYTE;
868 else if (vtop->r & VT_LVAL_SHORT)
869 t = VT_SHORT;
870 if (vtop->r & VT_LVAL_UNSIGNED)
871 t |= VT_UNSIGNED;
872 vtop->type.t = t;
873 load(r, vtop);
874 /* restore wanted type */
875 vtop->type.t = t1;
876 } else {
877 /* one register type load */
878 load(r, vtop);
879 }
880 }
881 vtop->r = r;
882 #ifdef TCC_TARGET_C67
883 /* uses register pairs for doubles */
884 if ((vtop->type.t & VT_BTYPE) == VT_DOUBLE)
885 vtop->r2 = r+1;
886 #endif
887 }
888 return r;
889 }
890
891 /* generate vtop[-1] and vtop[0] in resp. classes rc1 and rc2 */
892 ST_FUNC void gv2(int rc1, int rc2)
893 {
894 int v;
895
896 /* generate more generic register first. But VT_JMP or VT_CMP
897 values must be generated first in all cases to avoid possible
898 reload errors */
899 v = vtop[0].r & VT_VALMASK;
900 if (v != VT_CMP && (v & ~1) != VT_JMP && rc1 <= rc2) {
901 vswap();
902 gv(rc1);
903 vswap();
904 gv(rc2);
905 /* test if reload is needed for first register */
906 if ((vtop[-1].r & VT_VALMASK) >= VT_CONST) {
907 vswap();
908 gv(rc1);
909 vswap();
910 }
911 } else {
912 gv(rc2);
913 vswap();
914 gv(rc1);
915 vswap();
916 /* test if reload is needed for first register */
917 if ((vtop[0].r & VT_VALMASK) >= VT_CONST) {
918 gv(rc2);
919 }
920 }
921 }
922
923 /* wrapper around RC_FRET to return a register by type */
924 static int rc_fret(int t)
925 {
926 #ifdef TCC_TARGET_X86_64
927 if (t == VT_LDOUBLE) {
928 return RC_ST0;
929 }
930 #endif
931 return RC_FRET;
932 }
933
934 /* wrapper around REG_FRET to return a register by type */
935 static int reg_fret(int t)
936 {
937 #ifdef TCC_TARGET_X86_64
938 if (t == VT_LDOUBLE) {
939 return TREG_ST0;
940 }
941 #endif
942 return REG_FRET;
943 }
944
945 /* expand long long on stack in two int registers */
946 static void lexpand(void)
947 {
948 int u;
949
950 u = vtop->type.t & VT_UNSIGNED;
951 gv(RC_INT);
952 vdup();
953 vtop[0].r = vtop[-1].r2;
954 vtop[0].r2 = VT_CONST;
955 vtop[-1].r2 = VT_CONST;
956 vtop[0].type.t = VT_INT | u;
957 vtop[-1].type.t = VT_INT | u;
958 }
959
960 #ifdef TCC_TARGET_ARM
961 /* expand long long on stack */
962 ST_FUNC void lexpand_nr(void)
963 {
964 int u,v;
965
966 u = vtop->type.t & VT_UNSIGNED;
967 vdup();
968 vtop->r2 = VT_CONST;
969 vtop->type.t = VT_INT | u;
970 v=vtop[-1].r & (VT_VALMASK | VT_LVAL);
971 if (v == VT_CONST) {
972 vtop[-1].c.ui = vtop->c.ull;
973 vtop->c.ui = vtop->c.ull >> 32;
974 vtop->r = VT_CONST;
975 } else if (v == (VT_LVAL|VT_CONST) || v == (VT_LVAL|VT_LOCAL)) {
976 vtop->c.ui += 4;
977 vtop->r = vtop[-1].r;
978 } else if (v > VT_CONST) {
979 vtop--;
980 lexpand();
981 } else
982 vtop->r = vtop[-1].r2;
983 vtop[-1].r2 = VT_CONST;
984 vtop[-1].type.t = VT_INT | u;
985 }
986 #endif
987
988 /* build a long long from two ints */
989 static void lbuild(int t)
990 {
991 gv2(RC_INT, RC_INT);
992 vtop[-1].r2 = vtop[0].r;
993 vtop[-1].type.t = t;
994 vpop();
995 }
996
997 /* rotate n first stack elements to the bottom
998 I1 ... In -> I2 ... In I1 [top is right]
999 */
1000 ST_FUNC void vrotb(int n)
1001 {
1002 int i;
1003 SValue tmp;
1004
1005 tmp = vtop[-n + 1];
1006 for(i=-n+1;i!=0;i++)
1007 vtop[i] = vtop[i+1];
1008 vtop[0] = tmp;
1009 }
1010
1011 /* rotate the n elements before entry e towards the top
1012 I1 ... In ... -> In I1 ... I(n-1) ... [top is right]
1013 */
1014 ST_FUNC void vrote(SValue *e, int n)
1015 {
1016 int i;
1017 SValue tmp;
1018
1019 tmp = *e;
1020 for(i = 0;i < n - 1; i++)
1021 e[-i] = e[-i - 1];
1022 e[-n + 1] = tmp;
1023 }
1024
1025 /* rotate n first stack elements to the top
1026 I1 ... In -> In I1 ... I(n-1) [top is right]
1027 */
1028 ST_FUNC void vrott(int n)
1029 {
1030 vrote(vtop, n);
1031 }
1032
1033 /* pop stack value */
1034 ST_FUNC void vpop(void)
1035 {
1036 int v;
1037 v = vtop->r & VT_VALMASK;
1038 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
1039 /* for x86, we need to pop the FP stack */
1040 if (v == TREG_ST0 && !nocode_wanted) {
1041 o(0xd8dd); /* fstp %st(0) */
1042 } else
1043 #endif
1044 if (v == VT_JMP || v == VT_JMPI) {
1045 /* need to put correct jump if && or || without test */
1046 gsym(vtop->c.ul);
1047 }
1048 vtop--;
1049 }
1050
1051 /* convert stack entry to register and duplicate its value in another
1052 register */
1053 static void gv_dup(void)
1054 {
1055 int rc, t, r, r1;
1056 SValue sv;
1057
1058 t = vtop->type.t;
1059 if ((t & VT_BTYPE) == VT_LLONG) {
1060 lexpand();
1061 gv_dup();
1062 vswap();
1063 vrotb(3);
1064 gv_dup();
1065 vrotb(4);
1066 /* stack: H L L1 H1 */
1067 lbuild(t);
1068 vrotb(3);
1069 vrotb(3);
1070 vswap();
1071 lbuild(t);
1072 vswap();
1073 } else {
1074 /* duplicate value */
1075 rc = RC_INT;
1076 sv.type.t = VT_INT;
1077 if (is_float(t)) {
1078 rc = RC_FLOAT;
1079 #ifdef TCC_TARGET_X86_64
1080 if ((t & VT_BTYPE) == VT_LDOUBLE) {
1081 rc = RC_ST0;
1082 }
1083 #endif
1084 sv.type.t = t;
1085 }
1086 r = gv(rc);
1087 r1 = get_reg(rc);
1088 sv.r = r;
1089 sv.c.ul = 0;
1090 load(r1, &sv); /* move r to r1 */
1091 vdup();
1092 /* duplicates value */
1093 if (r != r1)
1094 vtop->r = r1;
1095 }
1096 }
1097
1098 #ifndef TCC_TARGET_X86_64
1099 /* generate CPU independent (unsigned) long long operations */
1100 static void gen_opl(int op)
1101 {
1102 int t, a, b, op1, c, i;
1103 int func;
1104 unsigned short reg_iret = REG_IRET;
1105 unsigned short reg_lret = REG_LRET;
1106 SValue tmp;
1107
1108 switch(op) {
1109 case '/':
1110 case TOK_PDIV:
1111 func = TOK___divdi3;
1112 goto gen_func;
1113 case TOK_UDIV:
1114 func = TOK___udivdi3;
1115 goto gen_func;
1116 case '%':
1117 func = TOK___moddi3;
1118 goto gen_mod_func;
1119 case TOK_UMOD:
1120 func = TOK___umoddi3;
1121 gen_mod_func:
1122 #ifdef TCC_ARM_EABI
1123 reg_iret = TREG_R2;
1124 reg_lret = TREG_R3;
1125 #endif
1126 gen_func:
1127 /* call generic long long function */
1128 vpush_global_sym(&func_old_type, func);
1129 vrott(3);
1130 gfunc_call(2);
1131 vpushi(0);
1132 vtop->r = reg_iret;
1133 vtop->r2 = reg_lret;
1134 break;
1135 case '^':
1136 case '&':
1137 case '|':
1138 case '*':
1139 case '+':
1140 case '-':
1141 t = vtop->type.t;
1142 vswap();
1143 lexpand();
1144 vrotb(3);
1145 lexpand();
1146 /* stack: L1 H1 L2 H2 */
1147 tmp = vtop[0];
1148 vtop[0] = vtop[-3];
1149 vtop[-3] = tmp;
1150 tmp = vtop[-2];
1151 vtop[-2] = vtop[-3];
1152 vtop[-3] = tmp;
1153 vswap();
1154 /* stack: H1 H2 L1 L2 */
1155 if (op == '*') {
1156 vpushv(vtop - 1);
1157 vpushv(vtop - 1);
1158 gen_op(TOK_UMULL);
1159 lexpand();
1160 /* stack: H1 H2 L1 L2 ML MH */
1161 for(i=0;i<4;i++)
1162 vrotb(6);
1163 /* stack: ML MH H1 H2 L1 L2 */
1164 tmp = vtop[0];
1165 vtop[0] = vtop[-2];
1166 vtop[-2] = tmp;
1167 /* stack: ML MH H1 L2 H2 L1 */
1168 gen_op('*');
1169 vrotb(3);
1170 vrotb(3);
1171 gen_op('*');
1172 /* stack: ML MH M1 M2 */
1173 gen_op('+');
1174 gen_op('+');
1175 } else if (op == '+' || op == '-') {
1176 /* XXX: add non carry method too (for MIPS or alpha) */
1177 if (op == '+')
1178 op1 = TOK_ADDC1;
1179 else
1180 op1 = TOK_SUBC1;
1181 gen_op(op1);
1182 /* stack: H1 H2 (L1 op L2) */
1183 vrotb(3);
1184 vrotb(3);
1185 gen_op(op1 + 1); /* TOK_xxxC2 */
1186 } else {
1187 gen_op(op);
1188 /* stack: H1 H2 (L1 op L2) */
1189 vrotb(3);
1190 vrotb(3);
1191 /* stack: (L1 op L2) H1 H2 */
1192 gen_op(op);
1193 /* stack: (L1 op L2) (H1 op H2) */
1194 }
1195 /* stack: L H */
1196 lbuild(t);
1197 break;
1198 case TOK_SAR:
1199 case TOK_SHR:
1200 case TOK_SHL:
1201 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
1202 t = vtop[-1].type.t;
1203 vswap();
1204 lexpand();
1205 vrotb(3);
1206 /* stack: L H shift */
1207 c = (int)vtop->c.i;
1208 /* constant: simpler */
1209 /* NOTE: all comments are for SHL. the other cases are
1210 done by swaping words */
1211 vpop();
1212 if (op != TOK_SHL)
1213 vswap();
1214 if (c >= 32) {
1215 /* stack: L H */
1216 vpop();
1217 if (c > 32) {
1218 vpushi(c - 32);
1219 gen_op(op);
1220 }
1221 if (op != TOK_SAR) {
1222 vpushi(0);
1223 } else {
1224 gv_dup();
1225 vpushi(31);
1226 gen_op(TOK_SAR);
1227 }
1228 vswap();
1229 } else {
1230 vswap();
1231 gv_dup();
1232 /* stack: H L L */
1233 vpushi(c);
1234 gen_op(op);
1235 vswap();
1236 vpushi(32 - c);
1237 if (op == TOK_SHL)
1238 gen_op(TOK_SHR);
1239 else
1240 gen_op(TOK_SHL);
1241 vrotb(3);
1242 /* stack: L L H */
1243 vpushi(c);
1244 if (op == TOK_SHL)
1245 gen_op(TOK_SHL);
1246 else
1247 gen_op(TOK_SHR);
1248 gen_op('|');
1249 }
1250 if (op != TOK_SHL)
1251 vswap();
1252 lbuild(t);
1253 } else {
1254 /* XXX: should provide a faster fallback on x86 ? */
1255 switch(op) {
1256 case TOK_SAR:
1257 func = TOK___ashrdi3;
1258 goto gen_func;
1259 case TOK_SHR:
1260 func = TOK___lshrdi3;
1261 goto gen_func;
1262 case TOK_SHL:
1263 func = TOK___ashldi3;
1264 goto gen_func;
1265 }
1266 }
1267 break;
1268 default:
1269 /* compare operations */
1270 t = vtop->type.t;
1271 vswap();
1272 lexpand();
1273 vrotb(3);
1274 lexpand();
1275 /* stack: L1 H1 L2 H2 */
1276 tmp = vtop[-1];
1277 vtop[-1] = vtop[-2];
1278 vtop[-2] = tmp;
1279 /* stack: L1 L2 H1 H2 */
1280 /* compare high */
1281 op1 = op;
1282 /* when values are equal, we need to compare low words. since
1283 the jump is inverted, we invert the test too. */
1284 if (op1 == TOK_LT)
1285 op1 = TOK_LE;
1286 else if (op1 == TOK_GT)
1287 op1 = TOK_GE;
1288 else if (op1 == TOK_ULT)
1289 op1 = TOK_ULE;
1290 else if (op1 == TOK_UGT)
1291 op1 = TOK_UGE;
1292 a = 0;
1293 b = 0;
1294 gen_op(op1);
1295 if (op1 != TOK_NE) {
1296 a = gtst(1, 0);
1297 }
1298 if (op != TOK_EQ) {
1299 /* generate non equal test */
1300 /* XXX: NOT PORTABLE yet */
1301 if (a == 0) {
1302 b = gtst(0, 0);
1303 } else {
1304 #if defined(TCC_TARGET_I386)
1305 b = psym(0x850f, 0);
1306 #elif defined(TCC_TARGET_ARM)
1307 b = ind;
1308 o(0x1A000000 | encbranch(ind, 0, 1));
1309 #elif defined(TCC_TARGET_C67)
1310 tcc_error("not implemented");
1311 #else
1312 #error not supported
1313 #endif
1314 }
1315 }
1316 /* compare low. Always unsigned */
1317 op1 = op;
1318 if (op1 == TOK_LT)
1319 op1 = TOK_ULT;
1320 else if (op1 == TOK_LE)
1321 op1 = TOK_ULE;
1322 else if (op1 == TOK_GT)
1323 op1 = TOK_UGT;
1324 else if (op1 == TOK_GE)
1325 op1 = TOK_UGE;
1326 gen_op(op1);
1327 a = gtst(1, a);
1328 gsym(b);
1329 vseti(VT_JMPI, a);
1330 break;
1331 }
1332 }
1333 #endif
1334
1335 /* handle integer constant optimizations and various machine
1336 independent opt */
1337 static void gen_opic(int op)
1338 {
1339 int c1, c2, t1, t2, n;
1340 SValue *v1, *v2;
1341 long long l1, l2;
1342 typedef unsigned long long U;
1343
1344 v1 = vtop - 1;
1345 v2 = vtop;
1346 t1 = v1->type.t & VT_BTYPE;
1347 t2 = v2->type.t & VT_BTYPE;
1348
1349 if (t1 == VT_LLONG)
1350 l1 = v1->c.ll;
1351 else if (v1->type.t & VT_UNSIGNED)
1352 l1 = v1->c.ui;
1353 else
1354 l1 = v1->c.i;
1355
1356 if (t2 == VT_LLONG)
1357 l2 = v2->c.ll;
1358 else if (v2->type.t & VT_UNSIGNED)
1359 l2 = v2->c.ui;
1360 else
1361 l2 = v2->c.i;
1362
1363 /* currently, we cannot do computations with forward symbols */
1364 c1 = (v1->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1365 c2 = (v2->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1366 if (c1 && c2) {
1367 switch(op) {
1368 case '+': l1 += l2; break;
1369 case '-': l1 -= l2; break;
1370 case '&': l1 &= l2; break;
1371 case '^': l1 ^= l2; break;
1372 case '|': l1 |= l2; break;
1373 case '*': l1 *= l2; break;
1374
1375 case TOK_PDIV:
1376 case '/':
1377 case '%':
1378 case TOK_UDIV:
1379 case TOK_UMOD:
1380 /* if division by zero, generate explicit division */
1381 if (l2 == 0) {
1382 if (const_wanted)
1383 tcc_error("division by zero in constant");
1384 goto general_case;
1385 }
1386 switch(op) {
1387 default: l1 /= l2; break;
1388 case '%': l1 %= l2; break;
1389 case TOK_UDIV: l1 = (U)l1 / l2; break;
1390 case TOK_UMOD: l1 = (U)l1 % l2; break;
1391 }
1392 break;
1393 case TOK_SHL: l1 <<= l2; break;
1394 case TOK_SHR: l1 = (U)l1 >> l2; break;
1395 case TOK_SAR: l1 >>= l2; break;
1396 /* tests */
1397 case TOK_ULT: l1 = (U)l1 < (U)l2; break;
1398 case TOK_UGE: l1 = (U)l1 >= (U)l2; break;
1399 case TOK_EQ: l1 = l1 == l2; break;
1400 case TOK_NE: l1 = l1 != l2; break;
1401 case TOK_ULE: l1 = (U)l1 <= (U)l2; break;
1402 case TOK_UGT: l1 = (U)l1 > (U)l2; break;
1403 case TOK_LT: l1 = l1 < l2; break;
1404 case TOK_GE: l1 = l1 >= l2; break;
1405 case TOK_LE: l1 = l1 <= l2; break;
1406 case TOK_GT: l1 = l1 > l2; break;
1407 /* logical */
1408 case TOK_LAND: l1 = l1 && l2; break;
1409 case TOK_LOR: l1 = l1 || l2; break;
1410 default:
1411 goto general_case;
1412 }
1413 v1->c.ll = l1;
1414 vtop--;
1415 } else {
1416 /* if commutative ops, put c2 as constant */
1417 if (c1 && (op == '+' || op == '&' || op == '^' ||
1418 op == '|' || op == '*')) {
1419 vswap();
1420 c2 = c1; //c = c1, c1 = c2, c2 = c;
1421 l2 = l1; //l = l1, l1 = l2, l2 = l;
1422 }
1423 /* Filter out NOP operations like x*1, x-0, x&-1... */
1424 if (c2 && (((op == '*' || op == '/' || op == TOK_UDIV ||
1425 op == TOK_PDIV) &&
1426 l2 == 1) ||
1427 ((op == '+' || op == '-' || op == '|' || op == '^' ||
1428 op == TOK_SHL || op == TOK_SHR || op == TOK_SAR) &&
1429 l2 == 0) ||
1430 (op == '&' &&
1431 l2 == -1))) {
1432 /* nothing to do */
1433 vtop--;
1434 } else if (c2 && (op == '*' || op == TOK_PDIV || op == TOK_UDIV)) {
1435 /* try to use shifts instead of muls or divs */
1436 if (l2 > 0 && (l2 & (l2 - 1)) == 0) {
1437 n = -1;
1438 while (l2) {
1439 l2 >>= 1;
1440 n++;
1441 }
1442 vtop->c.ll = n;
1443 if (op == '*')
1444 op = TOK_SHL;
1445 else if (op == TOK_PDIV)
1446 op = TOK_SAR;
1447 else
1448 op = TOK_SHR;
1449 }
1450 goto general_case;
1451 } else if (c2 && (op == '+' || op == '-') &&
1452 (((vtop[-1].r & (VT_VALMASK | VT_LVAL | VT_SYM)) == (VT_CONST | VT_SYM))
1453 || (vtop[-1].r & (VT_VALMASK | VT_LVAL)) == VT_LOCAL)) {
1454 /* symbol + constant case */
1455 if (op == '-')
1456 l2 = -l2;
1457 vtop--;
1458 vtop->c.ll += l2;
1459 } else {
1460 general_case:
1461 if (!nocode_wanted) {
1462 /* call low level op generator */
1463 if (t1 == VT_LLONG || t2 == VT_LLONG)
1464 gen_opl(op);
1465 else
1466 gen_opi(op);
1467 } else {
1468 vtop--;
1469 }
1470 }
1471 }
1472 }
1473
1474 /* generate a floating point operation with constant propagation */
1475 static void gen_opif(int op)
1476 {
1477 int c1, c2;
1478 SValue *v1, *v2;
1479 long double f1, f2;
1480
1481 v1 = vtop - 1;
1482 v2 = vtop;
1483 /* currently, we cannot do computations with forward symbols */
1484 c1 = (v1->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1485 c2 = (v2->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1486 if (c1 && c2) {
1487 if (v1->type.t == VT_FLOAT) {
1488 f1 = v1->c.f;
1489 f2 = v2->c.f;
1490 } else if (v1->type.t == VT_DOUBLE) {
1491 f1 = v1->c.d;
1492 f2 = v2->c.d;
1493 } else {
1494 f1 = v1->c.ld;
1495 f2 = v2->c.ld;
1496 }
1497
1498 /* NOTE: we only do constant propagation if finite number (not
1499 NaN or infinity) (ANSI spec) */
1500 if (!ieee_finite(f1) || !ieee_finite(f2))
1501 goto general_case;
1502
1503 switch(op) {
1504 case '+': f1 += f2; break;
1505 case '-': f1 -= f2; break;
1506 case '*': f1 *= f2; break;
1507 case '/':
1508 if (f2 == 0.0) {
1509 if (const_wanted)
1510 tcc_error("division by zero in constant");
1511 goto general_case;
1512 }
1513 f1 /= f2;
1514 break;
1515 /* XXX: also handles tests ? */
1516 default:
1517 goto general_case;
1518 }
1519 /* XXX: overflow test ? */
1520 if (v1->type.t == VT_FLOAT) {
1521 v1->c.f = f1;
1522 } else if (v1->type.t == VT_DOUBLE) {
1523 v1->c.d = f1;
1524 } else {
1525 v1->c.ld = f1;
1526 }
1527 vtop--;
1528 } else {
1529 general_case:
1530 if (!nocode_wanted) {
1531 gen_opf(op);
1532 } else {
1533 vtop--;
1534 }
1535 }
1536 }
1537
1538 static int pointed_size(CType *type)
1539 {
1540 int align;
1541 return type_size(pointed_type(type), &align);
1542 }
1543
1544 static void vla_runtime_pointed_size(CType *type)
1545 {
1546 int align;
1547 vla_runtime_type_size(pointed_type(type), &align);
1548 }
1549
1550 static inline int is_null_pointer(SValue *p)
1551 {
1552 if ((p->r & (VT_VALMASK | VT_LVAL | VT_SYM)) != VT_CONST)
1553 return 0;
1554 return ((p->type.t & VT_BTYPE) == VT_INT && p->c.i == 0) ||
1555 ((p->type.t & VT_BTYPE) == VT_LLONG && p->c.ll == 0) ||
1556 ((p->type.t & VT_BTYPE) == VT_PTR && p->c.ptr == 0);
1557 }
1558
1559 static inline int is_integer_btype(int bt)
1560 {
1561 return (bt == VT_BYTE || bt == VT_SHORT ||
1562 bt == VT_INT || bt == VT_LLONG);
1563 }
1564
1565 /* check types for comparison or substraction of pointers */
1566 static void check_comparison_pointer_types(SValue *p1, SValue *p2, int op)
1567 {
1568 CType *type1, *type2, tmp_type1, tmp_type2;
1569 int bt1, bt2;
1570
1571 /* null pointers are accepted for all comparisons as gcc */
1572 if (is_null_pointer(p1) || is_null_pointer(p2))
1573 return;
1574 type1 = &p1->type;
1575 type2 = &p2->type;
1576 bt1 = type1->t & VT_BTYPE;
1577 bt2 = type2->t & VT_BTYPE;
1578 /* accept comparison between pointer and integer with a warning */
1579 if ((is_integer_btype(bt1) || is_integer_btype(bt2)) && op != '-') {
1580 if (op != TOK_LOR && op != TOK_LAND )
1581 tcc_warning("comparison between pointer and integer");
1582 return;
1583 }
1584
1585 /* both must be pointers or implicit function pointers */
1586 if (bt1 == VT_PTR) {
1587 type1 = pointed_type(type1);
1588 } else if (bt1 != VT_FUNC)
1589 goto invalid_operands;
1590
1591 if (bt2 == VT_PTR) {
1592 type2 = pointed_type(type2);
1593 } else if (bt2 != VT_FUNC) {
1594 invalid_operands:
1595 tcc_error("invalid operands to binary %s", get_tok_str(op, NULL));
1596 }
1597 if ((type1->t & VT_BTYPE) == VT_VOID ||
1598 (type2->t & VT_BTYPE) == VT_VOID)
1599 return;
1600 tmp_type1 = *type1;
1601 tmp_type2 = *type2;
1602 tmp_type1.t &= ~(VT_UNSIGNED | VT_CONSTANT | VT_VOLATILE);
1603 tmp_type2.t &= ~(VT_UNSIGNED | VT_CONSTANT | VT_VOLATILE);
1604 if (!is_compatible_types(&tmp_type1, &tmp_type2)) {
1605 /* gcc-like error if '-' is used */
1606 if (op == '-')
1607 goto invalid_operands;
1608 else
1609 tcc_warning("comparison of distinct pointer types lacks a cast");
1610 }
1611 }
1612
1613 /* generic gen_op: handles types problems */
1614 ST_FUNC void gen_op(int op)
1615 {
1616 int u, t1, t2, bt1, bt2, t;
1617 CType type1;
1618
1619 t1 = vtop[-1].type.t;
1620 t2 = vtop[0].type.t;
1621 bt1 = t1 & VT_BTYPE;
1622 bt2 = t2 & VT_BTYPE;
1623
1624 if (bt1 == VT_PTR || bt2 == VT_PTR) {
1625 /* at least one operand is a pointer */
1626 /* relationnal op: must be both pointers */
1627 if (op >= TOK_ULT && op <= TOK_LOR) {
1628 check_comparison_pointer_types(vtop - 1, vtop, op);
1629 /* pointers are handled are unsigned */
1630 #ifdef TCC_TARGET_X86_64
1631 t = VT_LLONG | VT_UNSIGNED;
1632 #else
1633 t = VT_INT | VT_UNSIGNED;
1634 #endif
1635 goto std_op;
1636 }
1637 /* if both pointers, then it must be the '-' op */
1638 if (bt1 == VT_PTR && bt2 == VT_PTR) {
1639 if (op != '-')
1640 tcc_error("cannot use pointers here");
1641 check_comparison_pointer_types(vtop - 1, vtop, op);
1642 /* XXX: check that types are compatible */
1643 if (vtop[-1].type.t & VT_VLA) {
1644 vla_runtime_pointed_size(&vtop[-1].type);
1645 } else {
1646 vpushi(pointed_size(&vtop[-1].type));
1647 }
1648 vrott(3);
1649 gen_opic(op);
1650 /* set to integer type */
1651 #ifdef TCC_TARGET_X86_64
1652 vtop->type.t = VT_LLONG;
1653 #else
1654 vtop->type.t = VT_INT;
1655 #endif
1656 vswap();
1657 gen_op(TOK_PDIV);
1658 } else {
1659 /* exactly one pointer : must be '+' or '-'. */
1660 if (op != '-' && op != '+')
1661 tcc_error("cannot use pointers here");
1662 /* Put pointer as first operand */
1663 if (bt2 == VT_PTR) {
1664 vswap();
1665 swap(&t1, &t2);
1666 }
1667 type1 = vtop[-1].type;
1668 type1.t &= ~VT_ARRAY;
1669 if (vtop[-1].type.t & VT_VLA)
1670 vla_runtime_pointed_size(&vtop[-1].type);
1671 else {
1672 u = pointed_size(&vtop[-1].type);
1673 if (u < 0)
1674 tcc_error("unknown array element size");
1675 #ifdef TCC_TARGET_X86_64
1676 vpushll(u);
1677 #else
1678 /* XXX: cast to int ? (long long case) */
1679 vpushi(u);
1680 #endif
1681 }
1682 gen_op('*');
1683 #ifdef CONFIG_TCC_BCHECK
1684 /* if evaluating constant expression, no code should be
1685 generated, so no bound check */
1686 if (tcc_state->do_bounds_check && !const_wanted) {
1687 /* if bounded pointers, we generate a special code to
1688 test bounds */
1689 if (op == '-') {
1690 vpushi(0);
1691 vswap();
1692 gen_op('-');
1693 }
1694 gen_bounded_ptr_add();
1695 } else
1696 #endif
1697 {
1698 gen_opic(op);
1699 }
1700 /* put again type if gen_opic() swaped operands */
1701 vtop->type = type1;
1702 }
1703 } else if (is_float(bt1) || is_float(bt2)) {
1704 /* compute bigger type and do implicit casts */
1705 if (bt1 == VT_LDOUBLE || bt2 == VT_LDOUBLE) {
1706 t = VT_LDOUBLE;
1707 } else if (bt1 == VT_DOUBLE || bt2 == VT_DOUBLE) {
1708 t = VT_DOUBLE;
1709 } else {
1710 t = VT_FLOAT;
1711 }
1712 /* floats can only be used for a few operations */
1713 if (op != '+' && op != '-' && op != '*' && op != '/' &&
1714 (op < TOK_ULT || op > TOK_GT))
1715 tcc_error("invalid operands for binary operation");
1716 goto std_op;
1717 } else if (op == TOK_SHR || op == TOK_SAR || op == TOK_SHL) {
1718 t = bt1 == VT_LLONG ? VT_LLONG : VT_INT;
1719 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (t | VT_UNSIGNED))
1720 t |= VT_UNSIGNED;
1721 goto std_op;
1722 } else if (bt1 == VT_LLONG || bt2 == VT_LLONG) {
1723 /* cast to biggest op */
1724 t = VT_LLONG;
1725 /* convert to unsigned if it does not fit in a long long */
1726 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED) ||
1727 (t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED))
1728 t |= VT_UNSIGNED;
1729 goto std_op;
1730 } else if (bt1 == VT_STRUCT || bt2 == VT_STRUCT) {
1731 tcc_error("comparison of struct");
1732 } else {
1733 /* integer operations */
1734 t = VT_INT;
1735 /* convert to unsigned if it does not fit in an integer */
1736 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED) ||
1737 (t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED))
1738 t |= VT_UNSIGNED;
1739 std_op:
1740 /* XXX: currently, some unsigned operations are explicit, so
1741 we modify them here */
1742 if (t & VT_UNSIGNED) {
1743 if (op == TOK_SAR)
1744 op = TOK_SHR;
1745 else if (op == '/')
1746 op = TOK_UDIV;
1747 else if (op == '%')
1748 op = TOK_UMOD;
1749 else if (op == TOK_LT)
1750 op = TOK_ULT;
1751 else if (op == TOK_GT)
1752 op = TOK_UGT;
1753 else if (op == TOK_LE)
1754 op = TOK_ULE;
1755 else if (op == TOK_GE)
1756 op = TOK_UGE;
1757 }
1758 vswap();
1759 type1.t = t;
1760 gen_cast(&type1);
1761 vswap();
1762 /* special case for shifts and long long: we keep the shift as
1763 an integer */
1764 if (op == TOK_SHR || op == TOK_SAR || op == TOK_SHL)
1765 type1.t = VT_INT;
1766 gen_cast(&type1);
1767 if (is_float(t))
1768 gen_opif(op);
1769 else
1770 gen_opic(op);
1771 if (op >= TOK_ULT && op <= TOK_GT) {
1772 /* relationnal op: the result is an int */
1773 vtop->type.t = VT_INT;
1774 } else {
1775 vtop->type.t = t;
1776 }
1777 }
1778 }
1779
1780 #ifndef TCC_TARGET_ARM
1781 /* generic itof for unsigned long long case */
1782 static void gen_cvt_itof1(int t)
1783 {
1784 if ((vtop->type.t & (VT_BTYPE | VT_UNSIGNED)) ==
1785 (VT_LLONG | VT_UNSIGNED)) {
1786
1787 if (t == VT_FLOAT)
1788 vpush_global_sym(&func_old_type, TOK___floatundisf);
1789 #if LDOUBLE_SIZE != 8
1790 else if (t == VT_LDOUBLE)
1791 vpush_global_sym(&func_old_type, TOK___floatundixf);
1792 #endif
1793 else
1794 vpush_global_sym(&func_old_type, TOK___floatundidf);
1795 vrott(2);
1796 gfunc_call(1);
1797 vpushi(0);
1798 vtop->r = reg_fret(t);
1799 } else {
1800 gen_cvt_itof(t);
1801 }
1802 }
1803 #endif
1804
1805 /* generic ftoi for unsigned long long case */
1806 static void gen_cvt_ftoi1(int t)
1807 {
1808 int st;
1809
1810 if (t == (VT_LLONG | VT_UNSIGNED)) {
1811 /* not handled natively */
1812 st = vtop->type.t & VT_BTYPE;
1813 if (st == VT_FLOAT)
1814 vpush_global_sym(&func_old_type, TOK___fixunssfdi);
1815 #if LDOUBLE_SIZE != 8
1816 else if (st == VT_LDOUBLE)
1817 vpush_global_sym(&func_old_type, TOK___fixunsxfdi);
1818 #endif
1819 else
1820 vpush_global_sym(&func_old_type, TOK___fixunsdfdi);
1821 vrott(2);
1822 gfunc_call(1);
1823 vpushi(0);
1824 vtop->r = REG_IRET;
1825 vtop->r2 = REG_LRET;
1826 } else {
1827 gen_cvt_ftoi(t);
1828 }
1829 }
1830
1831 /* force char or short cast */
1832 static void force_charshort_cast(int t)
1833 {
1834 int bits, dbt;
1835 dbt = t & VT_BTYPE;
1836 /* XXX: add optimization if lvalue : just change type and offset */
1837 if (dbt == VT_BYTE)
1838 bits = 8;
1839 else
1840 bits = 16;
1841 if (t & VT_UNSIGNED) {
1842 vpushi((1 << bits) - 1);
1843 gen_op('&');
1844 } else {
1845 bits = 32 - bits;
1846 vpushi(bits);
1847 gen_op(TOK_SHL);
1848 /* result must be signed or the SAR is converted to an SHL
1849 This was not the case when "t" was a signed short
1850 and the last value on the stack was an unsigned int */
1851 vtop->type.t &= ~VT_UNSIGNED;
1852 vpushi(bits);
1853 gen_op(TOK_SAR);
1854 }
1855 }
1856
1857 /* cast 'vtop' to 'type'. Casting to bitfields is forbidden. */
1858 static void gen_cast(CType *type)
1859 {
1860 int sbt, dbt, sf, df, c, p;
1861
1862 /* special delayed cast for char/short */
1863 /* XXX: in some cases (multiple cascaded casts), it may still
1864 be incorrect */
1865 if (vtop->r & VT_MUSTCAST) {
1866 vtop->r &= ~VT_MUSTCAST;
1867 force_charshort_cast(vtop->type.t);
1868 }
1869
1870 /* bitfields first get cast to ints */
1871 if (vtop->type.t & VT_BITFIELD) {
1872 gv(RC_INT);
1873 }
1874
1875 dbt = type->t & (VT_BTYPE | VT_UNSIGNED);
1876 sbt = vtop->type.t & (VT_BTYPE | VT_UNSIGNED);
1877
1878 if (sbt != dbt) {
1879 sf = is_float(sbt);
1880 df = is_float(dbt);
1881 c = (vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1882 p = (vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == (VT_CONST | VT_SYM);
1883 if (c) {
1884 /* constant case: we can do it now */
1885 /* XXX: in ISOC, cannot do it if error in convert */
1886 if (sbt == VT_FLOAT)
1887 vtop->c.ld = vtop->c.f;
1888 else if (sbt == VT_DOUBLE)
1889 vtop->c.ld = vtop->c.d;
1890
1891 if (df) {
1892 if ((sbt & VT_BTYPE) == VT_LLONG) {
1893 if (sbt & VT_UNSIGNED)
1894 vtop->c.ld = vtop->c.ull;
1895 else
1896 vtop->c.ld = vtop->c.ll;
1897 } else if(!sf) {
1898 if (sbt & VT_UNSIGNED)
1899 vtop->c.ld = vtop->c.ui;
1900 else
1901 vtop->c.ld = vtop->c.i;
1902 }
1903
1904 if (dbt == VT_FLOAT)
1905 vtop->c.f = (float)vtop->c.ld;
1906 else if (dbt == VT_DOUBLE)
1907 vtop->c.d = (double)vtop->c.ld;
1908 } else if (sf && dbt == (VT_LLONG|VT_UNSIGNED)) {
1909 vtop->c.ull = (unsigned long long)vtop->c.ld;
1910 } else if (sf && dbt == VT_BOOL) {
1911 vtop->c.i = (vtop->c.ld != 0);
1912 } else {
1913 if(sf)
1914 vtop->c.ll = (long long)vtop->c.ld;
1915 else if (sbt == (VT_LLONG|VT_UNSIGNED))
1916 vtop->c.ll = vtop->c.ull;
1917 else if (sbt & VT_UNSIGNED)
1918 vtop->c.ll = vtop->c.ui;
1919 #ifdef TCC_TARGET_X86_64
1920 else if (sbt == VT_PTR)
1921 ;
1922 #endif
1923 else if (sbt != VT_LLONG)
1924 vtop->c.ll = vtop->c.i;
1925
1926 if (dbt == (VT_LLONG|VT_UNSIGNED))
1927 vtop->c.ull = vtop->c.ll;
1928 else if (dbt == VT_BOOL)
1929 vtop->c.i = (vtop->c.ll != 0);
1930 else if (dbt != VT_LLONG) {
1931 int s = 0;
1932 if ((dbt & VT_BTYPE) == VT_BYTE)
1933 s = 24;
1934 else if ((dbt & VT_BTYPE) == VT_SHORT)
1935 s = 16;
1936
1937 if(dbt & VT_UNSIGNED)
1938 vtop->c.ui = ((unsigned int)vtop->c.ll << s) >> s;
1939 else
1940 vtop->c.i = ((int)vtop->c.ll << s) >> s;
1941 }
1942 }
1943 } else if (p && dbt == VT_BOOL) {
1944 vtop->r = VT_CONST;
1945 vtop->c.i = 1;
1946 } else if (!nocode_wanted) {
1947 /* non constant case: generate code */
1948 if (sf && df) {
1949 /* convert from fp to fp */
1950 gen_cvt_ftof(dbt);
1951 } else if (df) {
1952 /* convert int to fp */
1953 gen_cvt_itof1(dbt);
1954 } else if (sf) {
1955 /* convert fp to int */
1956 if (dbt == VT_BOOL) {
1957 vpushi(0);
1958 gen_op(TOK_NE);
1959 } else {
1960 /* we handle char/short/etc... with generic code */
1961 if (dbt != (VT_INT | VT_UNSIGNED) &&
1962 dbt != (VT_LLONG | VT_UNSIGNED) &&
1963 dbt != VT_LLONG)
1964 dbt = VT_INT;
1965 gen_cvt_ftoi1(dbt);
1966 if (dbt == VT_INT && (type->t & (VT_BTYPE | VT_UNSIGNED)) != dbt) {
1967 /* additional cast for char/short... */
1968 vtop->type.t = dbt;
1969 gen_cast(type);
1970 }
1971 }
1972 #ifndef TCC_TARGET_X86_64
1973 } else if ((dbt & VT_BTYPE) == VT_LLONG) {
1974 if ((sbt & VT_BTYPE) != VT_LLONG) {
1975 /* scalar to long long */
1976 /* machine independent conversion */
1977 gv(RC_INT);
1978 /* generate high word */
1979 if (sbt == (VT_INT | VT_UNSIGNED)) {
1980 vpushi(0);
1981 gv(RC_INT);
1982 } else {
1983 if (sbt == VT_PTR) {
1984 /* cast from pointer to int before we apply
1985 shift operation, which pointers don't support*/
1986 gen_cast(&int_type);
1987 }
1988 gv_dup();
1989 vpushi(31);
1990 gen_op(TOK_SAR);
1991 }
1992 /* patch second register */
1993 vtop[-1].r2 = vtop->r;
1994 vpop();
1995 }
1996 #else
1997 } else if ((dbt & VT_BTYPE) == VT_LLONG ||
1998 (dbt & VT_BTYPE) == VT_PTR ||
1999 (dbt & VT_BTYPE) == VT_FUNC) {
2000 if ((sbt & VT_BTYPE) != VT_LLONG &&
2001 (sbt & VT_BTYPE) != VT_PTR &&
2002 (sbt & VT_BTYPE) != VT_FUNC) {
2003 /* need to convert from 32bit to 64bit */
2004 int r = gv(RC_INT);
2005 if (sbt != (VT_INT | VT_UNSIGNED)) {
2006 /* x86_64 specific: movslq */
2007 o(0x6348);
2008 o(0xc0 + (REG_VALUE(r) << 3) + REG_VALUE(r));
2009 }
2010 }
2011 #endif
2012 } else if (dbt == VT_BOOL) {
2013 /* scalar to bool */
2014 vpushi(0);
2015 gen_op(TOK_NE);
2016 } else if ((dbt & VT_BTYPE) == VT_BYTE ||
2017 (dbt & VT_BTYPE) == VT_SHORT) {
2018 if (sbt == VT_PTR) {
2019 vtop->type.t = VT_INT;
2020 tcc_warning("nonportable conversion from pointer to char/short");
2021 }
2022 force_charshort_cast(dbt);
2023 } else if ((dbt & VT_BTYPE) == VT_INT) {
2024 /* scalar to int */
2025 if (sbt == VT_LLONG) {
2026 /* from long long: just take low order word */
2027 lexpand();
2028 vpop();
2029 }
2030 /* if lvalue and single word type, nothing to do because
2031 the lvalue already contains the real type size (see
2032 VT_LVAL_xxx constants) */
2033 }
2034 }
2035 } else if ((dbt & VT_BTYPE) == VT_PTR && !(vtop->r & VT_LVAL)) {
2036 /* if we are casting between pointer types,
2037 we must update the VT_LVAL_xxx size */
2038 vtop->r = (vtop->r & ~VT_LVAL_TYPE)
2039 | (lvalue_type(type->ref->type.t) & VT_LVAL_TYPE);
2040 }
2041 vtop->type = *type;
2042 }
2043
2044 /* return type size as known at compile time. Put alignment at 'a' */
2045 ST_FUNC int type_size(CType *type, int *a)
2046 {
2047 Sym *s;
2048 int bt;
2049
2050 bt = type->t & VT_BTYPE;
2051 if (bt == VT_STRUCT) {
2052 /* struct/union */
2053 s = type->ref;
2054 *a = s->r;
2055 return s->c;
2056 } else if (bt == VT_PTR) {
2057 if (type->t & VT_ARRAY) {
2058 int ts;
2059
2060 s = type->ref;
2061 ts = type_size(&s->type, a);
2062
2063 if (ts < 0 && s->c < 0)
2064 ts = -ts;
2065
2066 return ts * s->c;
2067 } else {
2068 *a = PTR_SIZE;
2069 return PTR_SIZE;
2070 }
2071 } else if (bt == VT_LDOUBLE) {
2072 *a = LDOUBLE_ALIGN;
2073 return LDOUBLE_SIZE;
2074 } else if (bt == VT_DOUBLE || bt == VT_LLONG) {
2075 #ifdef TCC_TARGET_I386
2076 #ifdef TCC_TARGET_PE
2077 *a = 8;
2078 #else
2079 *a = 4;
2080 #endif
2081 #elif defined(TCC_TARGET_ARM)
2082 #ifdef TCC_ARM_EABI
2083 *a = 8;
2084 #else
2085 *a = 4;
2086 #endif
2087 #else
2088 *a = 8;
2089 #endif
2090 return 8;
2091 } else if (bt == VT_INT || bt == VT_ENUM || bt == VT_FLOAT) {
2092 *a = 4;
2093 return 4;
2094 } else if (bt == VT_SHORT) {
2095 *a = 2;
2096 return 2;
2097 } else if (bt == VT_QLONG || bt == VT_QFLOAT) {
2098 *a = 8;
2099 return 16;
2100 } else {
2101 /* char, void, function, _Bool */
2102 *a = 1;
2103 return 1;
2104 }
2105 }
2106
2107 /* push type size as known at runtime time on top of value stack. Put
2108 alignment at 'a' */
2109 ST_FUNC void vla_runtime_type_size(CType *type, int *a)
2110 {
2111 if (type->t & VT_VLA) {
2112 vset(&int_type, VT_LOCAL|VT_LVAL, type->ref->c);
2113 } else {
2114 vpushi(type_size(type, a));
2115 }
2116 }
2117
2118 static void vla_sp_save(void) {
2119 if (!(vla_flags & VLA_SP_LOC_SET)) {
2120 *vla_sp_loc = (loc -= PTR_SIZE);
2121 vla_flags |= VLA_SP_LOC_SET;
2122 }
2123 if (!(vla_flags & VLA_SP_SAVED)) {
2124 gen_vla_sp_save(*vla_sp_loc);
2125 vla_flags |= VLA_SP_SAVED;
2126 }
2127 }
2128
2129 /* return the pointed type of t */
2130 static inline CType *pointed_type(CType *type)
2131 {
2132 return &type->ref->type;
2133 }
2134
2135 /* modify type so that its it is a pointer to type. */
2136 ST_FUNC void mk_pointer(CType *type)
2137 {
2138 Sym *s;
2139 s = sym_push(SYM_FIELD, type, 0, -1);
2140 type->t = VT_PTR | (type->t & ~VT_TYPE);
2141 type->ref = s;
2142 }
2143
2144 /* compare function types. OLD functions match any new functions */
2145 static int is_compatible_func(CType *type1, CType *type2)
2146 {
2147 Sym *s1, *s2;
2148
2149 s1 = type1->ref;
2150 s2 = type2->ref;
2151 if (!is_compatible_types(&s1->type, &s2->type))
2152 return 0;
2153 /* check func_call */
2154 if (FUNC_CALL(s1->r) != FUNC_CALL(s2->r))
2155 return 0;
2156 /* XXX: not complete */
2157 if (s1->c == FUNC_OLD || s2->c == FUNC_OLD)
2158 return 1;
2159 if (s1->c != s2->c)
2160 return 0;
2161 while (s1 != NULL) {
2162 if (s2 == NULL)
2163 return 0;
2164 if (!is_compatible_parameter_types(&s1->type, &s2->type))
2165 return 0;
2166 s1 = s1->next;
2167 s2 = s2->next;
2168 }
2169 if (s2)
2170 return 0;
2171 return 1;
2172 }
2173
2174 /* return true if type1 and type2 are the same. If unqualified is
2175 true, qualifiers on the types are ignored.
2176
2177 - enums are not checked as gcc __builtin_types_compatible_p ()
2178 */
2179 static int compare_types(CType *type1, CType *type2, int unqualified)
2180 {
2181 int bt1, t1, t2;
2182
2183 t1 = type1->t & VT_TYPE;
2184 t2 = type2->t & VT_TYPE;
2185 if (unqualified) {
2186 /* strip qualifiers before comparing */
2187 t1 &= ~(VT_CONSTANT | VT_VOLATILE);
2188 t2 &= ~(VT_CONSTANT | VT_VOLATILE);
2189 }
2190 /* XXX: bitfields ? */
2191 if (t1 != t2)
2192 return 0;
2193 /* test more complicated cases */
2194 bt1 = t1 & VT_BTYPE;
2195 if (bt1 == VT_PTR) {
2196 type1 = pointed_type(type1);
2197 type2 = pointed_type(type2);
2198 return is_compatible_types(type1, type2);
2199 } else if (bt1 == VT_STRUCT) {
2200 return (type1->ref == type2->ref);
2201 } else if (bt1 == VT_FUNC) {
2202 return is_compatible_func(type1, type2);
2203 } else {
2204 return 1;
2205 }
2206 }
2207
2208 /* return true if type1 and type2 are exactly the same (including
2209 qualifiers).
2210 */
2211 static int is_compatible_types(CType *type1, CType *type2)
2212 {
2213 return compare_types(type1,type2,0);
2214 }
2215
2216 /* return true if type1 and type2 are the same (ignoring qualifiers).
2217 */
2218 static int is_compatible_parameter_types(CType *type1, CType *type2)
2219 {
2220 return compare_types(type1,type2,1);
2221 }
2222
2223 /* print a type. If 'varstr' is not NULL, then the variable is also
2224 printed in the type */
2225 /* XXX: union */
2226 /* XXX: add array and function pointers */
2227 static void type_to_str(char *buf, int buf_size,
2228 CType *type, const char *varstr)
2229 {
2230 int bt, v, t;
2231 Sym *s, *sa;
2232 char buf1[256];
2233 const char *tstr;
2234
2235 t = type->t & VT_TYPE;
2236 bt = t & VT_BTYPE;
2237 buf[0] = '\0';
2238 if (t & VT_CONSTANT)
2239 pstrcat(buf, buf_size, "const ");
2240 if (t & VT_VOLATILE)
2241 pstrcat(buf, buf_size, "volatile ");
2242 if (t & VT_UNSIGNED)
2243 pstrcat(buf, buf_size, "unsigned ");
2244 switch(bt) {
2245 case VT_VOID:
2246 tstr = "void";
2247 goto add_tstr;
2248 case VT_BOOL:
2249 tstr = "_Bool";
2250 goto add_tstr;
2251 case VT_BYTE:
2252 tstr = "char";
2253 goto add_tstr;
2254 case VT_SHORT:
2255 tstr = "short";
2256 goto add_tstr;
2257 case VT_INT:
2258 tstr = "int";
2259 goto add_tstr;
2260 case VT_LONG:
2261 tstr = "long";
2262 goto add_tstr;
2263 case VT_LLONG:
2264 tstr = "long long";
2265 goto add_tstr;
2266 case VT_FLOAT:
2267 tstr = "float";
2268 goto add_tstr;
2269 case VT_DOUBLE:
2270 tstr = "double";
2271 goto add_tstr;
2272 case VT_LDOUBLE:
2273 tstr = "long double";
2274 add_tstr:
2275 pstrcat(buf, buf_size, tstr);
2276 break;
2277 case VT_ENUM:
2278 case VT_STRUCT:
2279 if (bt == VT_STRUCT)
2280 tstr = "struct ";
2281 else
2282 tstr = "enum ";
2283 pstrcat(buf, buf_size, tstr);
2284 v = type->ref->v & ~SYM_STRUCT;
2285 if (v >= SYM_FIRST_ANOM)
2286 pstrcat(buf, buf_size, "<anonymous>");
2287 else
2288 pstrcat(buf, buf_size, get_tok_str(v, NULL));
2289 break;
2290 case VT_FUNC:
2291 s = type->ref;
2292 type_to_str(buf, buf_size, &s->type, varstr);
2293 pstrcat(buf, buf_size, "(");
2294 sa = s->next;
2295 while (sa != NULL) {
2296 type_to_str(buf1, sizeof(buf1), &sa->type, NULL);
2297 pstrcat(buf, buf_size, buf1);
2298 sa = sa->next;
2299 if (sa)
2300 pstrcat(buf, buf_size, ", ");
2301 }
2302 pstrcat(buf, buf_size, ")");
2303 goto no_var;
2304 case VT_PTR:
2305 s = type->ref;
2306 pstrcpy(buf1, sizeof(buf1), "*");
2307 if (varstr)
2308 pstrcat(buf1, sizeof(buf1), varstr);
2309 type_to_str(buf, buf_size, &s->type, buf1);
2310 goto no_var;
2311 }
2312 if (varstr) {
2313 pstrcat(buf, buf_size, " ");
2314 pstrcat(buf, buf_size, varstr);
2315 }
2316 no_var: ;
2317 }
2318
2319 /* verify type compatibility to store vtop in 'dt' type, and generate
2320 casts if needed. */
2321 static void gen_assign_cast(CType *dt)
2322 {
2323 CType *st, *type1, *type2, tmp_type1, tmp_type2;
2324 char buf1[256], buf2[256];
2325 int dbt, sbt;
2326
2327 st = &vtop->type; /* source type */
2328 dbt = dt->t & VT_BTYPE;
2329 sbt = st->t & VT_BTYPE;
2330 if (sbt == VT_VOID)
2331 tcc_error("Cannot assign void value");
2332 if (dt->t & VT_CONSTANT)
2333 tcc_warning("assignment of read-only location");
2334 switch(dbt) {
2335 case VT_PTR:
2336 /* special cases for pointers */
2337 /* '0' can also be a pointer */
2338 if (is_null_pointer(vtop))
2339 goto type_ok;
2340 /* accept implicit pointer to integer cast with warning */
2341 if (is_integer_btype(sbt)) {
2342 tcc_warning("assignment makes pointer from integer without a cast");
2343 goto type_ok;
2344 }
2345 type1 = pointed_type(dt);
2346 /* a function is implicitely a function pointer */
2347 if (sbt == VT_FUNC) {
2348 if ((type1->t & VT_BTYPE) != VT_VOID &&
2349 !is_compatible_types(pointed_type(dt), st))
2350 tcc_warning("assignment from incompatible pointer type");
2351 goto type_ok;
2352 }
2353 if (sbt != VT_PTR)
2354 goto error;
2355 type2 = pointed_type(st);
2356 if ((type1->t & VT_BTYPE) == VT_VOID ||
2357 (type2->t & VT_BTYPE) == VT_VOID) {
2358 /* void * can match anything */
2359 } else {
2360 /* exact type match, except for unsigned */
2361 tmp_type1 = *type1;
2362 tmp_type2 = *type2;
2363 tmp_type1.t &= ~(VT_UNSIGNED | VT_CONSTANT | VT_VOLATILE);
2364 tmp_type2.t &= ~(VT_UNSIGNED | VT_CONSTANT | VT_VOLATILE);
2365 if (!is_compatible_types(&tmp_type1, &tmp_type2))
2366 tcc_warning("assignment from incompatible pointer type");
2367 }
2368 /* check const and volatile */
2369 if ((!(type1->t & VT_CONSTANT) && (type2->t & VT_CONSTANT)) ||
2370 (!(type1->t & VT_VOLATILE) && (type2->t & VT_VOLATILE)))
2371 tcc_warning("assignment discards qualifiers from pointer target type");
2372 break;
2373 case VT_BYTE:
2374 case VT_SHORT:
2375 case VT_INT:
2376 case VT_LLONG:
2377 if (sbt == VT_PTR || sbt == VT_FUNC) {
2378 tcc_warning("assignment makes integer from pointer without a cast");
2379 }
2380 /* XXX: more tests */
2381 break;
2382 case VT_STRUCT:
2383 tmp_type1 = *dt;
2384 tmp_type2 = *st;
2385 tmp_type1.t &= ~(VT_CONSTANT | VT_VOLATILE);
2386 tmp_type2.t &= ~(VT_CONSTANT | VT_VOLATILE);
2387 if (!is_compatible_types(&tmp_type1, &tmp_type2)) {
2388 error:
2389 type_to_str(buf1, sizeof(buf1), st, NULL);
2390 type_to_str(buf2, sizeof(buf2), dt, NULL);
2391 tcc_error("cannot cast '%s' to '%s'", buf1, buf2);
2392 }
2393 break;
2394 }
2395 type_ok:
2396 gen_cast(dt);
2397 }
2398
2399 /* store vtop in lvalue pushed on stack */
2400 ST_FUNC void vstore(void)
2401 {
2402 int sbt, dbt, ft, r, t, size, align, bit_size, bit_pos, rc, delayed_cast;
2403
2404 ft = vtop[-1].type.t;
2405 sbt = vtop->type.t & VT_BTYPE;
2406 dbt = ft & VT_BTYPE;
2407 if ((((sbt == VT_INT || sbt == VT_SHORT) && dbt == VT_BYTE) ||
2408 (sbt == VT_INT && dbt == VT_SHORT))
2409 && !(vtop->type.t & VT_BITFIELD)) {
2410 /* optimize char/short casts */
2411 delayed_cast = VT_MUSTCAST;
2412 vtop->type.t = ft & (VT_TYPE & ~(VT_BITFIELD | (-1 << VT_STRUCT_SHIFT)));
2413 /* XXX: factorize */
2414 if (ft & VT_CONSTANT)
2415 tcc_warning("assignment of read-only location");
2416 } else {
2417 delayed_cast = 0;
2418 if (!(ft & VT_BITFIELD))
2419 gen_assign_cast(&vtop[-1].type);
2420 }
2421
2422 if (sbt == VT_STRUCT) {
2423 /* if structure, only generate pointer */
2424 /* structure assignment : generate memcpy */
2425 /* XXX: optimize if small size */
2426 if (!nocode_wanted) {
2427 size = type_size(&vtop->type, &align);
2428
2429 /* destination */
2430 vswap();
2431 vtop->type.t = VT_PTR;
2432 gaddrof();
2433
2434 /* address of memcpy() */
2435 #ifdef TCC_ARM_EABI
2436 if(!(align & 7))
2437 vpush_global_sym(&func_old_type, TOK_memcpy8);
2438 else if(!(align & 3))
2439 vpush_global_sym(&func_old_type, TOK_memcpy4);
2440 else
2441 #endif
2442 vpush_global_sym(&func_old_type, TOK_memcpy);
2443
2444 vswap();
2445 /* source */
2446 vpushv(vtop - 2);
2447 vtop->type.t = VT_PTR;
2448 gaddrof();
2449 /* type size */
2450 vpushi(size);
2451 gfunc_call(3);
2452 } else {
2453 vswap();
2454 vpop();
2455 }
2456 /* leave source on stack */
2457 } else if (ft & VT_BITFIELD) {
2458 /* bitfield store handling */
2459 bit_pos = (ft >> VT_STRUCT_SHIFT) & 0x3f;
2460 bit_size = (ft >> (VT_STRUCT_SHIFT + 6)) & 0x3f;
2461 /* remove bit field info to avoid loops */
2462 vtop[-1].type.t = ft & ~(VT_BITFIELD | (-1 << VT_STRUCT_SHIFT));
2463
2464 /* duplicate source into other register */
2465 gv_dup();
2466 vswap();
2467 vrott(3);
2468
2469 if((ft & VT_BTYPE) == VT_BOOL) {
2470 gen_cast(&vtop[-1].type);
2471 vtop[-1].type.t = (vtop[-1].type.t & ~VT_BTYPE) | (VT_BYTE | VT_UNSIGNED);
2472 }
2473
2474 /* duplicate destination */
2475 vdup();
2476 vtop[-1] = vtop[-2];
2477
2478 /* mask and shift source */
2479 if((ft & VT_BTYPE) != VT_BOOL) {
2480 if((ft & VT_BTYPE) == VT_LLONG) {
2481 vpushll((1ULL << bit_size) - 1ULL);
2482 } else {
2483 vpushi((1 << bit_size) - 1);
2484 }
2485 gen_op('&');
2486 }
2487 vpushi(bit_pos);
2488 gen_op(TOK_SHL);
2489 /* load destination, mask and or with source */
2490 vswap();
2491 if((ft & VT_BTYPE) == VT_LLONG) {
2492 vpushll(~(((1ULL << bit_size) - 1ULL) << bit_pos));
2493 } else {
2494 vpushi(~(((1 << bit_size) - 1) << bit_pos));
2495 }
2496 gen_op('&');
2497 gen_op('|');
2498 /* store result */
2499 vstore();
2500
2501 /* pop off shifted source from "duplicate source..." above */
2502 vpop();
2503
2504 } else {
2505 #ifdef CONFIG_TCC_BCHECK
2506 /* bound check case */
2507 if (vtop[-1].r & VT_MUSTBOUND) {
2508 vswap();
2509 gbound();
2510 vswap();
2511 }
2512 #endif
2513 if (!nocode_wanted) {
2514 rc = RC_INT;
2515 if (is_float(ft)) {
2516 rc = RC_FLOAT;
2517 #ifdef TCC_TARGET_X86_64
2518 if ((ft & VT_BTYPE) == VT_LDOUBLE) {
2519 rc = RC_ST0;
2520 } else if ((ft & VT_BTYPE) == VT_QFLOAT) {
2521 rc = RC_FRET;
2522 }
2523 #endif
2524 }
2525 r = gv(rc); /* generate value */
2526 /* if lvalue was saved on stack, must read it */
2527 if ((vtop[-1].r & VT_VALMASK) == VT_LLOCAL) {
2528 SValue sv;
2529 t = get_reg(RC_INT);
2530 #ifdef TCC_TARGET_X86_64
2531 sv.type.t = VT_PTR;
2532 #else
2533 sv.type.t = VT_INT;
2534 #endif
2535 sv.r = VT_LOCAL | VT_LVAL;
2536 sv.c.ul = vtop[-1].c.ul;
2537 load(t, &sv);
2538 vtop[-1].r = t | VT_LVAL;
2539 }
2540 /* two word case handling : store second register at word + 4 (or +8 for x86-64) */
2541 #ifdef TCC_TARGET_X86_64
2542 if (((ft & VT_BTYPE) == VT_QLONG) || ((ft & VT_BTYPE) == VT_QFLOAT)) {
2543 int addr_type = VT_LLONG, load_size = 8, load_type = ((vtop->type.t & VT_BTYPE) == VT_QLONG) ? VT_LLONG : VT_DOUBLE;
2544 #else
2545 if ((ft & VT_BTYPE) == VT_LLONG) {
2546 int addr_type = VT_INT, load_size = 4, load_type = VT_INT;
2547 #endif
2548 vtop[-1].type.t = load_type;
2549 store(r, vtop - 1);
2550 vswap();
2551 /* convert to int to increment easily */
2552 vtop->type.t = addr_type;
2553 gaddrof();
2554 vpushi(load_size);
2555 gen_op('+');
2556 vtop->r |= VT_LVAL;
2557 vswap();
2558 vtop[-1].type.t = load_type;
2559 /* XXX: it works because r2 is spilled last ! */
2560 store(vtop->r2, vtop - 1);
2561 } else {
2562 store(r, vtop - 1);
2563 }
2564 }
2565 vswap();
2566 vtop--; /* NOT vpop() because on x86 it would flush the fp stack */
2567 vtop->r |= delayed_cast;
2568 }
2569 }
2570
2571 /* post defines POST/PRE add. c is the token ++ or -- */
2572 ST_FUNC void inc(int post, int c)
2573 {
2574 test_lvalue();
2575 vdup(); /* save lvalue */
2576 if (post) {
2577 gv_dup(); /* duplicate value */
2578 vrotb(3);
2579 vrotb(3);
2580 }
2581 /* add constant */
2582 vpushi(c - TOK_MID);
2583 gen_op('+');
2584 vstore(); /* store value */
2585 if (post)
2586 vpop(); /* if post op, return saved value */
2587 }
2588
2589 /* Parse GNUC __attribute__ extension. Currently, the following
2590 extensions are recognized:
2591 - aligned(n) : set data/function alignment.
2592 - packed : force data alignment to 1
2593 - section(x) : generate data/code in this section.
2594 - unused : currently ignored, but may be used someday.
2595 - regparm(n) : pass function parameters in registers (i386 only)
2596 */
2597 static void parse_attribute(AttributeDef *ad)
2598 {
2599 int t, n;
2600
2601 while (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2) {
2602 next();
2603 skip('(');
2604 skip('(');
2605 while (tok != ')') {
2606 if (tok < TOK_IDENT)
2607 expect("attribute name");
2608 t = tok;
2609 next();
2610 switch(t) {
2611 case TOK_SECTION1:
2612 case TOK_SECTION2:
2613 skip('(');
2614 if (tok != TOK_STR)
2615 expect("section name");
2616 ad->section = find_section(tcc_state, (char *)tokc.cstr->data);
2617 next();
2618 skip(')');
2619 break;
2620 case TOK_ALIAS1:
2621 case TOK_ALIAS2:
2622 skip('(');
2623 if (tok != TOK_STR)
2624 expect("alias(\"target\")");
2625 ad->alias_target = /* save string as token, for later */
2626 tok_alloc((char*)tokc.cstr->data, tokc.cstr->size-1)->tok;
2627 next();
2628 skip(')');
2629 break;
2630 case TOK_ALIGNED1:
2631 case TOK_ALIGNED2:
2632 if (tok == '(') {
2633 next();
2634 n = expr_const();
2635 if (n <= 0 || (n & (n - 1)) != 0)
2636 tcc_error("alignment must be a positive power of two");
2637 skip(')');
2638 } else {
2639 n = MAX_ALIGN;
2640 }
2641 ad->aligned = n;
2642 break;
2643 case TOK_PACKED1:
2644 case TOK_PACKED2:
2645 ad->packed = 1;
2646 break;
2647 case TOK_WEAK1:
2648 case TOK_WEAK2:
2649 ad->weak = 1;
2650 break;
2651 case TOK_UNUSED1:
2652 case TOK_UNUSED2:
2653 /* currently, no need to handle it because tcc does not
2654 track unused objects */
2655 break;
2656 case TOK_NORETURN1:
2657 case TOK_NORETURN2:
2658 /* currently, no need to handle it because tcc does not
2659 track unused objects */
2660 break;
2661 case TOK_CDECL1:
2662 case TOK_CDECL2:
2663 case TOK_CDECL3:
2664 ad->func_call = FUNC_CDECL;
2665 break;
2666 case TOK_STDCALL1:
2667 case TOK_STDCALL2:
2668 case TOK_STDCALL3:
2669 ad->func_call = FUNC_STDCALL;
2670 break;
2671 #ifdef TCC_TARGET_I386
2672 case TOK_REGPARM1:
2673 case TOK_REGPARM2:
2674 skip('(');
2675 n = expr_const();
2676 if (n > 3)
2677 n = 3;
2678 else if (n < 0)
2679 n = 0;
2680 if (n > 0)
2681 ad->func_call = FUNC_FASTCALL1 + n - 1;
2682 skip(')');
2683 break;
2684 case TOK_FASTCALL1:
2685 case TOK_FASTCALL2:
2686 case TOK_FASTCALL3:
2687 ad->func_call = FUNC_FASTCALLW;
2688 break;
2689 #endif
2690 case TOK_MODE:
2691 skip('(');
2692 switch(tok) {
2693 case TOK_MODE_DI:
2694 ad->mode = VT_LLONG + 1;
2695 break;
2696 case TOK_MODE_HI:
2697 ad->mode = VT_SHORT + 1;
2698 break;
2699 case TOK_MODE_SI:
2700 ad->mode = VT_INT + 1;
2701 break;
2702 default:
2703 tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok, NULL));
2704 break;
2705 }
2706 next();
2707 skip(')');
2708 break;
2709 case TOK_DLLEXPORT:
2710 ad->func_export = 1;
2711 break;
2712 case TOK_DLLIMPORT:
2713 ad->func_import = 1;
2714 break;
2715 default:
2716 if (tcc_state->warn_unsupported)
2717 tcc_warning("'%s' attribute ignored", get_tok_str(t, NULL));
2718 /* skip parameters */
2719 if (tok == '(') {
2720 int parenthesis = 0;
2721 do {
2722 if (tok == '(')
2723 parenthesis++;
2724 else if (tok == ')')
2725 parenthesis--;
2726 next();
2727 } while (parenthesis && tok != -1);
2728 }
2729 break;
2730 }
2731 if (tok != ',')
2732 break;
2733 next();
2734 }
2735 skip(')');
2736 skip(')');
2737 }
2738 }
2739
2740 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
2741 static void struct_decl(CType *type, int u)
2742 {
2743 int a, v, size, align, maxalign, c, offset;
2744 int bit_size, bit_pos, bsize, bt, lbit_pos, prevbt;
2745 Sym *s, *ss, *ass, **ps;
2746 AttributeDef ad;
2747 CType type1, btype;
2748
2749 a = tok; /* save decl type */
2750 next();
2751 if (tok != '{') {
2752 v = tok;
2753 next();
2754 /* struct already defined ? return it */
2755 if (v < TOK_IDENT)
2756 expect("struct/union/enum name");
2757 s = struct_find(v);
2758 if (s) {
2759 if (s->type.t != a)
2760 tcc_error("invalid type");
2761 goto do_decl;
2762 }
2763 } else {
2764 v = anon_sym++;
2765 }
2766 type1.t = a;
2767 /* we put an undefined size for struct/union */
2768 s = sym_push(v | SYM_STRUCT, &type1, 0, -1);
2769 s->r = 0; /* default alignment is zero as gcc */
2770 /* put struct/union/enum name in type */
2771 do_decl:
2772 type->t = u;
2773 type->ref = s;
2774
2775 if (tok == '{') {
2776 next();
2777 if (s->c != -1)
2778 tcc_error("struct/union/enum already defined");
2779 /* cannot be empty */
2780 c = 0;
2781 /* non empty enums are not allowed */
2782 if (a == TOK_ENUM) {
2783 for(;;) {
2784 v = tok;
2785 if (v < TOK_UIDENT)
2786 expect("identifier");
2787 next();
2788 if (tok == '=') {
2789 next();
2790 c = expr_const();
2791 }
2792 /* enum symbols have static storage */
2793 ss = sym_push(v, &int_type, VT_CONST, c);
2794 ss->type.t |= VT_STATIC;
2795 if (tok != ',')
2796 break;
2797 next();
2798 c++;
2799 /* NOTE: we accept a trailing comma */
2800 if (tok == '}')
2801 break;
2802 }
2803 skip('}');
2804 } else {
2805 maxalign = 1;
2806 ps = &s->next;
2807 prevbt = VT_INT;
2808 bit_pos = 0;
2809 offset = 0;
2810 while (tok != '}') {
2811 parse_btype(&btype, &ad);
2812 while (1) {
2813 bit_size = -1;
2814 v = 0;
2815 type1 = btype;
2816 if (tok != ':') {
2817 type_decl(&type1, &ad, &v, TYPE_DIRECT | TYPE_ABSTRACT);
2818 if (v == 0 && (type1.t & VT_BTYPE) != VT_STRUCT)
2819 expect("identifier");
2820 if ((type1.t & VT_BTYPE) == VT_FUNC ||
2821 (type1.t & (VT_TYPEDEF | VT_STATIC | VT_EXTERN | VT_INLINE)))
2822 tcc_error("invalid type for '%s'",
2823 get_tok_str(v, NULL));
2824 }
2825 if (tok == ':') {
2826 next();
2827 bit_size = expr_const();
2828 /* XXX: handle v = 0 case for messages */
2829 if (bit_size < 0)
2830 tcc_error("negative width in bit-field '%s'",
2831 get_tok_str(v, NULL));
2832 if (v && bit_size == 0)
2833 tcc_error("zero width for bit-field '%s'",
2834 get_tok_str(v, NULL));
2835 }
2836 size = type_size(&type1, &align);
2837 if (ad.aligned) {
2838 if (align < ad.aligned)
2839 align = ad.aligned;
2840 } else if (ad.packed) {
2841 align = 1;
2842 } else if (*tcc_state->pack_stack_ptr) {
2843 if (align > *tcc_state->pack_stack_ptr)
2844 align = *tcc_state->pack_stack_ptr;
2845 }
2846 lbit_pos = 0;
2847 if (bit_size >= 0) {
2848 bt = type1.t & VT_BTYPE;
2849 if (bt != VT_INT &&
2850 bt != VT_BYTE &&
2851 bt != VT_SHORT &&
2852 bt != VT_BOOL &&
2853 bt != VT_ENUM &&
2854 bt != VT_LLONG)
2855 tcc_error("bitfields must have scalar type");
2856 bsize = size * 8;
2857 if (bit_size > bsize) {
2858 tcc_error("width of '%s' exceeds its type",
2859 get_tok_str(v, NULL));
2860 } else if (bit_size == bsize) {
2861 /* no need for bit fields */
2862 bit_pos = 0;
2863 } else if (bit_size == 0) {
2864 /* XXX: what to do if only padding in a
2865 structure ? */
2866 /* zero size: means to pad */
2867 bit_pos = 0;
2868 } else {
2869 /* we do not have enough room ?
2870 did the type change?
2871 is it a union? */
2872 if ((bit_pos + bit_size) > bsize ||
2873 bt != prevbt || a == TOK_UNION)
2874 bit_pos = 0;
2875 lbit_pos = bit_pos;
2876 /* XXX: handle LSB first */
2877 type1.t |= VT_BITFIELD |
2878 (bit_pos << VT_STRUCT_SHIFT) |
2879 (bit_size << (VT_STRUCT_SHIFT + 6));
2880 bit_pos += bit_size;
2881 }
2882 prevbt = bt;
2883 } else {
2884 bit_pos = 0;
2885 }
2886 if (v != 0 || (type1.t & VT_BTYPE) == VT_STRUCT) {
2887 /* add new memory data only if starting
2888 bit field */
2889 if (lbit_pos == 0) {
2890 if (a == TOK_STRUCT) {
2891 c = (c + align - 1) & -align;
2892 offset = c;
2893 if (size > 0)
2894 c += size;
2895 } else {
2896 offset = 0;
2897 if (size > c)
2898 c = size;
2899 }
2900 if (align > maxalign)
2901 maxalign = align;
2902 }
2903 #if 0
2904 printf("add field %s offset=%d",
2905 get_tok_str(v, NULL), offset);
2906 if (type1.t & VT_BITFIELD) {
2907 printf(" pos=%d size=%d",
2908 (type1.t >> VT_STRUCT_SHIFT) & 0x3f,
2909 (type1.t >> (VT_STRUCT_SHIFT + 6)) & 0x3f);
2910 }
2911 printf("\n");
2912 #endif
2913 }
2914 if (v == 0 && (type1.t & VT_BTYPE) == VT_STRUCT) {
2915 ass = type1.ref;
2916 while ((ass = ass->next) != NULL) {
2917 ss = sym_push(ass->v, &ass->type, 0, offset + ass->c);
2918 *ps = ss;
2919 ps = &ss->next;
2920 }
2921 } else if (v) {
2922 ss = sym_push(v | SYM_FIELD, &type1, 0, offset);
2923 *ps = ss;
2924 ps = &ss->next;
2925 }
2926 if (tok == ';' || tok == TOK_EOF)
2927 break;
2928 skip(',');
2929 }
2930 skip(';');
2931 }
2932 skip('}');
2933 /* store size and alignment */
2934 s->c = (c + maxalign - 1) & -maxalign;
2935 s->r = maxalign;
2936 }
2937 }
2938 }
2939
2940 /* return 0 if no type declaration. otherwise, return the basic type
2941 and skip it.
2942 */
2943 static int parse_btype(CType *type, AttributeDef *ad)
2944 {
2945 int t, u, type_found, typespec_found, typedef_found;
2946 Sym *s;
2947 CType type1;
2948
2949 memset(ad, 0, sizeof(AttributeDef));
2950 type_found = 0;
2951 typespec_found = 0;
2952 typedef_found = 0;
2953 t = 0;
2954 while(1) {
2955 switch(tok) {
2956 case TOK_EXTENSION:
2957 /* currently, we really ignore extension */
2958 next();
2959 continue;
2960
2961 /* basic types */
2962 case TOK_CHAR:
2963 u = VT_BYTE;
2964 basic_type:
2965 next();
2966 basic_type1:
2967 if ((t & VT_BTYPE) != 0)
2968 tcc_error("too many basic types");
2969 t |= u;
2970 typespec_found = 1;
2971 break;
2972 case TOK_VOID:
2973 u = VT_VOID;
2974 goto basic_type;
2975 case TOK_SHORT:
2976 u = VT_SHORT;
2977 goto basic_type;
2978 case TOK_INT:
2979 next();
2980 typespec_found = 1;
2981 break;
2982 case TOK_LONG:
2983 next();
2984 if ((t & VT_BTYPE) == VT_DOUBLE) {
2985 #ifndef TCC_TARGET_PE
2986 t = (t & ~VT_BTYPE) | VT_LDOUBLE;
2987 #endif
2988 } else if ((t & VT_BTYPE) == VT_LONG) {
2989 t = (t & ~VT_BTYPE) | VT_LLONG;
2990 } else {
2991 u = VT_LONG;
2992 goto basic_type1;
2993 }
2994 break;
2995 case TOK_BOOL:
2996 u = VT_BOOL;
2997 goto basic_type;
2998 case TOK_FLOAT:
2999 u = VT_FLOAT;
3000 goto basic_type;
3001 case TOK_DOUBLE:
3002 next();
3003 if ((t & VT_BTYPE) == VT_LONG) {
3004 #ifdef TCC_TARGET_PE
3005 t = (t & ~VT_BTYPE) | VT_DOUBLE;
3006 #else
3007 t = (t & ~VT_BTYPE) | VT_LDOUBLE;
3008 #endif
3009 } else {
3010 u = VT_DOUBLE;
3011 goto basic_type1;
3012 }
3013 break;
3014 case TOK_ENUM:
3015 struct_decl(&type1, VT_ENUM);
3016 basic_type2:
3017 u = type1.t;
3018 type->ref = type1.ref;
3019 goto basic_type1;
3020 case TOK_STRUCT:
3021 case TOK_UNION:
3022 struct_decl(&type1, VT_STRUCT);
3023 goto basic_type2;
3024
3025 /* type modifiers */
3026 case TOK_CONST1:
3027 case TOK_CONST2:
3028 case TOK_CONST3:
3029 t |= VT_CONSTANT;
3030 next();
3031 break;
3032 case TOK_VOLATILE1:
3033 case TOK_VOLATILE2:
3034 case TOK_VOLATILE3:
3035 t |= VT_VOLATILE;
3036 next();
3037 break;
3038 case TOK_SIGNED1:
3039 case TOK_SIGNED2:
3040 case TOK_SIGNED3:
3041 typespec_found = 1;
3042 t |= VT_SIGNED;
3043 next();
3044 break;
3045 case TOK_REGISTER:
3046 case TOK_AUTO:
3047 case TOK_RESTRICT1:
3048 case TOK_RESTRICT2:
3049 case TOK_RESTRICT3:
3050 next();
3051 break;
3052 case TOK_UNSIGNED:
3053 t |= VT_UNSIGNED;
3054 next();
3055 typespec_found = 1;
3056 break;
3057
3058 /* storage */
3059 case TOK_EXTERN:
3060 t |= VT_EXTERN;
3061 next();
3062 break;
3063 case TOK_STATIC:
3064 t |= VT_STATIC;
3065 next();
3066 break;
3067 case TOK_TYPEDEF:
3068 t |= VT_TYPEDEF;
3069 next();
3070 break;
3071 case TOK_INLINE1:
3072 case TOK_INLINE2:
3073 case TOK_INLINE3:
3074 t |= VT_INLINE;
3075 next();
3076 break;
3077
3078 /* GNUC attribute */
3079 case TOK_ATTRIBUTE1:
3080 case TOK_ATTRIBUTE2:
3081 parse_attribute(ad);
3082 if (ad->mode) {
3083 u = ad->mode -1;
3084 t = (t & ~VT_BTYPE) | u;
3085 }
3086 break;
3087 /* GNUC typeof */
3088 case TOK_TYPEOF1:
3089 case TOK_TYPEOF2:
3090 case TOK_TYPEOF3:
3091 next();
3092 parse_expr_type(&type1);
3093 /* remove all storage modifiers except typedef */
3094 type1.t &= ~(VT_STORAGE&~VT_TYPEDEF);
3095 goto basic_type2;
3096 default:
3097 if (typespec_found || typedef_found)
3098 goto the_end;
3099 s = sym_find(tok);
3100 if (!s || !(s->type.t & VT_TYPEDEF))
3101 goto the_end;
3102 typedef_found = 1;
3103 t |= (s->type.t & ~VT_TYPEDEF);
3104 type->ref = s->type.ref;
3105 if (s->r) {
3106 /* get attributes from typedef */
3107 if (0 == ad->aligned)
3108 ad->aligned = FUNC_ALIGN(s->r);
3109 if (0 == ad->func_call)
3110 ad->func_call = FUNC_CALL(s->r);
3111 ad->packed |= FUNC_PACKED(s->r);
3112 }
3113 next();
3114 typespec_found = 1;
3115 break;
3116 }
3117 type_found = 1;
3118 }
3119 the_end:
3120 if ((t & (VT_SIGNED|VT_UNSIGNED)) == (VT_SIGNED|VT_UNSIGNED))
3121 tcc_error("signed and unsigned modifier");
3122 if (tcc_state->char_is_unsigned) {
3123 if ((t & (VT_SIGNED|VT_UNSIGNED|VT_BTYPE)) == VT_BYTE)
3124 t |= VT_UNSIGNED;
3125 }
3126 t &= ~VT_SIGNED;
3127
3128 /* long is never used as type */
3129 if ((t & VT_BTYPE) == VT_LONG)
3130 #if !defined TCC_TARGET_X86_64 || defined TCC_TARGET_PE
3131 t = (t & ~VT_BTYPE) | VT_INT;
3132 #else
3133 t = (t & ~VT_BTYPE) | VT_LLONG;
3134 #endif
3135 type->t = t;
3136 return type_found;
3137 }
3138
3139 /* convert a function parameter type (array to pointer and function to
3140 function pointer) */
3141 static inline void convert_parameter_type(CType *pt)
3142 {
3143 /* remove const and volatile qualifiers (XXX: const could be used
3144 to indicate a const function parameter */
3145 pt->t &= ~(VT_CONSTANT | VT_VOLATILE);
3146 /* array must be transformed to pointer according to ANSI C */
3147 pt->t &= ~VT_ARRAY;
3148 if ((pt->t & VT_BTYPE) == VT_FUNC) {
3149 mk_pointer(pt);
3150 }
3151 }
3152
3153 ST_FUNC void parse_asm_str(CString *astr)
3154 {
3155 skip('(');
3156 /* read the string */
3157 if (tok != TOK_STR)
3158 expect("string constant");
3159 cstr_new(astr);
3160 while (tok == TOK_STR) {
3161 /* XXX: add \0 handling too ? */
3162 cstr_cat(astr, tokc.cstr->data);
3163 next();
3164 }
3165 cstr_ccat(astr, '\0');
3166 }
3167
3168 /* Parse an asm label and return the label
3169 * Don't forget to free the CString in the caller! */
3170 static void asm_label_instr(CString *astr)
3171 {
3172 next();
3173 parse_asm_str(astr);
3174 skip(')');
3175 #ifdef ASM_DEBUG
3176 printf("asm_alias: \"%s\"\n", (char *)astr->data);
3177 #endif
3178 }
3179
3180 static void post_type(CType *type, AttributeDef *ad)
3181 {
3182 int n, l, t1, arg_size, align;
3183 Sym **plast, *s, *first;
3184 AttributeDef ad1;
3185 CType pt;
3186
3187 if (tok == '(') {
3188 /* function declaration */
3189 next();
3190 l = 0;
3191 first = NULL;
3192 plast = &first;
3193 arg_size = 0;
3194 if (tok != ')') {
3195 for(;;) {
3196 /* read param name and compute offset */
3197 if (l != FUNC_OLD) {
3198 if (!parse_btype(&pt, &ad1)) {
3199 if (l) {
3200 tcc_error("invalid type");
3201 } else {
3202 l = FUNC_OLD;
3203 goto old_proto;
3204 }
3205 }
3206 l = FUNC_NEW;
3207 if ((pt.t & VT_BTYPE) == VT_VOID && tok == ')')
3208 break;
3209 type_decl(&pt, &ad1, &n, TYPE_DIRECT | TYPE_ABSTRACT);
3210 if ((pt.t & VT_BTYPE) == VT_VOID)
3211 tcc_error("parameter declared as void");
3212 arg_size += (type_size(&pt, &align) + PTR_SIZE - 1) / PTR_SIZE;
3213 } else {
3214 old_proto:
3215 n = tok;
3216 if (n < TOK_UIDENT)
3217 expect("identifier");
3218 pt.t = VT_INT;
3219 next();
3220 }
3221 convert_parameter_type(&pt);
3222 s = sym_push(n | SYM_FIELD, &pt, 0, 0);
3223 *plast = s;
3224 plast = &s->next;
3225 if (tok == ')')
3226 break;
3227 skip(',');
3228 if (l == FUNC_NEW && tok == TOK_DOTS) {
3229 l = FUNC_ELLIPSIS;
3230 next();
3231 break;
3232 }
3233 }
3234 }
3235 /* if no parameters, then old type prototype */
3236 if (l == 0)
3237 l = FUNC_OLD;
3238 skip(')');
3239 /* NOTE: const is ignored in returned type as it has a special
3240 meaning in gcc / C++ */
3241 type->t &= ~VT_CONSTANT;
3242 /* some ancient pre-K&R C allows a function to return an array
3243 and the array brackets to be put after the arguments, such
3244 that "int c()[]" means something like "int[] c()" */
3245 if (tok == '[') {
3246 next();
3247 skip(']'); /* only handle simple "[]" */
3248 type->t |= VT_PTR;
3249 }
3250 /* we push a anonymous symbol which will contain the function prototype */
3251 ad->func_args = arg_size;
3252 s = sym_push(SYM_FIELD, type, INT_ATTR(ad), l);
3253 s->next = first;
3254 type->t = VT_FUNC;
3255 type->ref = s;
3256 } else if (tok == '[') {
3257 /* array definition */
3258 next();
3259 if (tok == TOK_RESTRICT1)
3260 next();
3261 n = -1;
3262 t1 = 0;
3263 if (tok != ']') {
3264 if (!local_stack || nocode_wanted)
3265 vpushi(expr_const());
3266 else gexpr();
3267 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
3268 n = vtop->c.i;
3269 if (n < 0)
3270 tcc_error("invalid array size");
3271 } else {
3272 if (!is_integer_btype(vtop->type.t & VT_BTYPE))
3273 tcc_error("size of variable length array should be an integer");
3274 t1 = VT_VLA;
3275 }
3276 }
3277 skip(']');
3278 /* parse next post type */
3279 post_type(type, ad);
3280 t1 |= type->t & VT_VLA;
3281
3282 if (t1 & VT_VLA) {
3283 loc -= type_size(&int_type, &align);
3284 loc &= -align;
3285 n = loc;
3286
3287 vla_runtime_type_size(type, &align);
3288 gen_op('*');
3289 vset(&int_type, VT_LOCAL|VT_LVAL, loc);
3290 vswap();
3291 vstore();
3292 }
3293 if (n != -1)
3294 vpop();
3295
3296 /* we push an anonymous symbol which will contain the array
3297 element type */
3298 s = sym_push(SYM_FIELD, type, 0, n);
3299 type->t = (t1 ? VT_VLA : VT_ARRAY) | VT_PTR;
3300 type->ref = s;
3301 }
3302 }
3303
3304 /* Parse a type declaration (except basic type), and return the type
3305 in 'type'. 'td' is a bitmask indicating which kind of type decl is
3306 expected. 'type' should contain the basic type. 'ad' is the
3307 attribute definition of the basic type. It can be modified by
3308 type_decl().
3309 */
3310 static void type_decl(CType *type, AttributeDef *ad, int *v, int td)
3311 {
3312 Sym *s;
3313 CType type1, *type2;
3314 int qualifiers, storage;
3315
3316 while (tok == '*') {
3317 qualifiers = 0;
3318 redo:
3319 next();
3320 switch(tok) {
3321 case TOK_CONST1:
3322 case TOK_CONST2:
3323 case TOK_CONST3:
3324 qualifiers |= VT_CONSTANT;
3325 goto redo;
3326 case TOK_VOLATILE1:
3327 case TOK_VOLATILE2:
3328 case TOK_VOLATILE3:
3329 qualifiers |= VT_VOLATILE;
3330 goto redo;
3331 case TOK_RESTRICT1:
3332 case TOK_RESTRICT2:
3333 case TOK_RESTRICT3:
3334 goto redo;
3335 }
3336 mk_pointer(type);
3337 type->t |= qualifiers;
3338 }
3339
3340 /* XXX: clarify attribute handling */
3341 if (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2)
3342 parse_attribute(ad);
3343
3344 /* recursive type */
3345 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
3346 type1.t = 0; /* XXX: same as int */
3347 if (tok == '(') {
3348 next();
3349 /* XXX: this is not correct to modify 'ad' at this point, but
3350 the syntax is not clear */
3351 if (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2)
3352 parse_attribute(ad);
3353 type_decl(&type1, ad, v, td);
3354 skip(')');
3355 } else {
3356 /* type identifier */
3357 if (tok >= TOK_IDENT && (td & TYPE_DIRECT)) {
3358 *v = tok;
3359 next();
3360 } else {
3361 if (!(td & TYPE_ABSTRACT))
3362 expect("identifier");
3363 *v = 0;
3364 }
3365 }
3366 storage = type->t & VT_STORAGE;
3367 type->t &= ~VT_STORAGE;
3368 if (storage & VT_STATIC) {
3369 int saved_nocode_wanted = nocode_wanted;
3370 nocode_wanted = 1;
3371 post_type(type, ad);
3372 nocode_wanted = saved_nocode_wanted;
3373 } else
3374 post_type(type, ad);
3375 type->t |= storage;
3376 if (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2)
3377 parse_attribute(ad);
3378
3379 if (!type1.t)
3380 return;
3381 /* append type at the end of type1 */
3382 type2 = &type1;
3383 for(;;) {
3384 s = type2->ref;
3385 type2 = &s->type;
3386 if (!type2->t) {
3387 *type2 = *type;
3388 break;
3389 }
3390 }
3391 *type = type1;
3392 }
3393
3394 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
3395 ST_FUNC int lvalue_type(int t)
3396 {
3397 int bt, r;
3398 r = VT_LVAL;
3399 bt = t & VT_BTYPE;
3400 if (bt == VT_BYTE || bt == VT_BOOL)
3401 r |= VT_LVAL_BYTE;
3402 else if (bt == VT_SHORT)
3403 r |= VT_LVAL_SHORT;
3404 else
3405 return r;
3406 if (t & VT_UNSIGNED)
3407 r |= VT_LVAL_UNSIGNED;
3408 return r;
3409 }
3410
3411 /* indirection with full error checking and bound check */
3412 ST_FUNC void indir(void)
3413 {
3414 if ((vtop->type.t & VT_BTYPE) != VT_PTR) {
3415 if ((vtop->type.t & VT_BTYPE) == VT_FUNC)
3416 return;
3417 expect("pointer");
3418 }
3419 if ((vtop->r & VT_LVAL) && !nocode_wanted)
3420 gv(RC_INT);
3421 vtop->type = *pointed_type(&vtop->type);
3422 /* Arrays and functions are never lvalues */
3423 if (!(vtop->type.t & VT_ARRAY) && !(vtop->type.t & VT_VLA)
3424 && (vtop->type.t & VT_BTYPE) != VT_FUNC) {
3425 vtop->r |= lvalue_type(vtop->type.t);
3426 /* if bound checking, the referenced pointer must be checked */
3427 #ifdef CONFIG_TCC_BCHECK
3428 if (tcc_state->do_bounds_check)
3429 vtop->r |= VT_MUSTBOUND;
3430 #endif
3431 }
3432 }
3433
3434 /* pass a parameter to a function and do type checking and casting */
3435 static void gfunc_param_typed(Sym *func, Sym *arg)
3436 {
3437 int func_type;
3438 CType type;
3439
3440 func_type = func->c;
3441 if (func_type == FUNC_OLD ||
3442 (func_type == FUNC_ELLIPSIS && arg == NULL)) {
3443 /* default casting : only need to convert float to double */
3444 if ((vtop->type.t & VT_BTYPE) == VT_FLOAT) {
3445 type.t = VT_DOUBLE;
3446 gen_cast(&type);
3447 }
3448 } else if (arg == NULL) {
3449 tcc_error("too many arguments to function");
3450 } else {
3451 type = arg->type;
3452 type.t &= ~VT_CONSTANT; /* need to do that to avoid false warning */
3453 gen_assign_cast(&type);
3454 }
3455 }
3456
3457 /* parse an expression of the form '(type)' or '(expr)' and return its
3458 type */
3459 static void parse_expr_type(CType *type)
3460 {
3461 int n;
3462 AttributeDef ad;
3463
3464 skip('(');
3465 if (parse_btype(type, &ad)) {
3466 type_decl(type, &ad, &n, TYPE_ABSTRACT);
3467 } else {
3468 expr_type(type);
3469 }
3470 skip(')');
3471 }
3472
3473 static void parse_type(CType *type)
3474 {
3475 AttributeDef ad;
3476 int n;
3477
3478 if (!parse_btype(type, &ad)) {
3479 expect("type");
3480 }
3481 type_decl(type, &ad, &n, TYPE_ABSTRACT);
3482 }
3483
3484 static void vpush_tokc(int t)
3485 {
3486 CType type;
3487 type.t = t;
3488 type.ref = 0;
3489 vsetc(&type, VT_CONST, &tokc);
3490 }
3491
3492 ST_FUNC void unary(void)
3493 {
3494 int n, t, align, size, r, sizeof_caller;
3495 CType type;
3496 Sym *s;
3497 AttributeDef ad;
3498 static int in_sizeof = 0;
3499
3500 sizeof_caller = in_sizeof;
3501 in_sizeof = 0;
3502 /* XXX: GCC 2.95.3 does not generate a table although it should be
3503 better here */
3504 tok_next:
3505 switch(tok) {
3506 case TOK_EXTENSION:
3507 next();
3508 goto tok_next;
3509 case TOK_CINT:
3510 case TOK_CCHAR:
3511 case TOK_LCHAR:
3512 vpushi(tokc.i);
3513 next();
3514 break;
3515 case TOK_CUINT:
3516 vpush_tokc(VT_INT | VT_UNSIGNED);
3517 next();
3518 break;
3519 case TOK_CLLONG:
3520 vpush_tokc(VT_LLONG);
3521 next();
3522 break;
3523 case TOK_CULLONG:
3524 vpush_tokc(VT_LLONG | VT_UNSIGNED);
3525 next();
3526 break;
3527 case TOK_CFLOAT:
3528 vpush_tokc(VT_FLOAT);
3529 next();
3530 break;
3531 case TOK_CDOUBLE:
3532 vpush_tokc(VT_DOUBLE);
3533 next();
3534 break;
3535 case TOK_CLDOUBLE:
3536 vpush_tokc(VT_LDOUBLE);
3537 next();
3538 break;
3539 case TOK___FUNCTION__:
3540 if (!gnu_ext)
3541 goto tok_identifier;
3542 /* fall thru */
3543 case TOK___FUNC__:
3544 {
3545 void *ptr;
3546 int len;
3547 /* special function name identifier */
3548 len = strlen(funcname) + 1;
3549 /* generate char[len] type */
3550 type.t = VT_BYTE;
3551 mk_pointer(&type);
3552 type.t |= VT_ARRAY;
3553 type.ref->c = len;
3554 vpush_ref(&type, data_section, data_section->data_offset, len);
3555 ptr = section_ptr_add(data_section, len);
3556 memcpy(ptr, funcname, len);
3557 next();
3558 }
3559 break;
3560 case TOK_LSTR:
3561 #ifdef TCC_TARGET_PE
3562 t = VT_SHORT | VT_UNSIGNED;
3563 #else
3564 t = VT_INT;
3565 #endif
3566 goto str_init;
3567 case TOK_STR:
3568 /* string parsing */
3569 t = VT_BYTE;
3570 str_init:
3571 if (tcc_state->warn_write_strings)
3572 t |= VT_CONSTANT;
3573 type.t = t;
3574 mk_pointer(&type);
3575 type.t |= VT_ARRAY;
3576 memset(&ad, 0, sizeof(AttributeDef));
3577 decl_initializer_alloc(&type, &ad, VT_CONST, 2, 0, NULL, 0);
3578 break;
3579 case '(':
3580 next();
3581 /* cast ? */
3582 if (parse_btype(&type, &ad)) {
3583 type_decl(&type, &ad, &n, TYPE_ABSTRACT);
3584 skip(')');
3585 /* check ISOC99 compound literal */
3586 if (tok == '{') {
3587 /* data is allocated locally by default */
3588 if (global_expr)
3589 r = VT_CONST;
3590 else
3591 r = VT_LOCAL;
3592 /* all except arrays are lvalues */
3593 if (!(type.t & VT_ARRAY))
3594 r |= lvalue_type(type.t);
3595 memset(&ad, 0, sizeof(AttributeDef));
3596 decl_initializer_alloc(&type, &ad, r, 1, 0, NULL, 0);
3597 } else {
3598 if (sizeof_caller) {
3599 vpush(&type);
3600 return;
3601 }
3602 unary();
3603 gen_cast(&type);
3604 }
3605 } else if (tok == '{') {
3606 /* save all registers */
3607 save_regs(0);
3608 /* statement expression : we do not accept break/continue
3609 inside as GCC does */
3610 block(NULL, NULL, NULL, NULL, 0, 1);
3611 skip(')');
3612 } else {
3613 gexpr();
3614 skip(')');
3615 }
3616 break;
3617 case '*':
3618 next();
3619 unary();
3620 indir();
3621 break;
3622 case '&':
3623 next();
3624 unary();
3625 /* functions names must be treated as function pointers,
3626 except for unary '&' and sizeof. Since we consider that
3627 functions are not lvalues, we only have to handle it
3628 there and in function calls. */
3629 /* arrays can also be used although they are not lvalues */
3630 if ((vtop->type.t & VT_BTYPE) != VT_FUNC &&
3631 !(vtop->type.t & VT_ARRAY) && !(vtop->type.t & VT_LLOCAL))
3632 test_lvalue();
3633 mk_pointer(&vtop->type);
3634 gaddrof();
3635 break;
3636 case '!':
3637 next();
3638 unary();
3639 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
3640 CType boolean;
3641 boolean.t = VT_BOOL;
3642 gen_cast(&boolean);
3643 vtop->c.i = !vtop->c.i;
3644 } else if ((vtop->r & VT_VALMASK) == VT_CMP)
3645 vtop->c.i = vtop->c.i ^ 1;
3646 else {
3647 save_regs(1);
3648 vseti(VT_JMP, gtst(1, 0));
3649 }
3650 break;
3651 case '~':
3652 next();
3653 unary();
3654 vpushi(-1);
3655 gen_op('^');
3656 break;
3657 case '+':
3658 next();
3659 /* in order to force cast, we add zero */
3660 unary();
3661 if ((vtop->type.t & VT_BTYPE) == VT_PTR)
3662 tcc_error("pointer not accepted for unary plus");
3663 vpushi(0);
3664 gen_op('+');
3665 break;
3666 case TOK_SIZEOF:
3667 case TOK_ALIGNOF1:
3668 case TOK_ALIGNOF2:
3669 t = tok;
3670 next();
3671 in_sizeof++;
3672 unary_type(&type); // Perform a in_sizeof = 0;
3673 size = type_size(&type, &align);
3674 if (t == TOK_SIZEOF) {
3675 if (!(type.t & VT_VLA)) {
3676 if (size < 0)
3677 tcc_error("sizeof applied to an incomplete type");
3678 vpushs(size);
3679 } else {
3680 vla_runtime_type_size(&type, &align);
3681 }
3682 } else {
3683 vpushs(align);
3684 }
3685 vtop->type.t |= VT_UNSIGNED;
3686 break;
3687
3688 case TOK_builtin_types_compatible_p:
3689 {
3690 CType type1, type2;
3691 next();
3692 skip('(');
3693 parse_type(&type1);
3694 skip(',');
3695 parse_type(&type2);
3696 skip(')');
3697 type1.t &= ~(VT_CONSTANT | VT_VOLATILE);
3698 type2.t &= ~(VT_CONSTANT | VT_VOLATILE);
3699 vpushi(is_compatible_types(&type1, &type2));
3700 }
3701 break;
3702 case TOK_builtin_constant_p:
3703 {
3704 int saved_nocode_wanted, res;
3705 next();
3706 skip('(');
3707 saved_nocode_wanted = nocode_wanted;
3708 nocode_wanted = 1;
3709 gexpr();
3710 res = (vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
3711 vpop();
3712 nocode_wanted = saved_nocode_wanted;
3713 skip(')');
3714 vpushi(res);
3715 }
3716 break;
3717 case TOK_builtin_frame_address:
3718 {
3719 int level;
3720 CType type;
3721 next();
3722 skip('(');
3723 if (tok != TOK_CINT || tokc.i < 0) {
3724 tcc_error("__builtin_frame_address only takes positive integers");
3725 }
3726 level = tokc.i;
3727 next();
3728 skip(')');
3729 type.t = VT_VOID;
3730 mk_pointer(&type);
3731 vset(&type, VT_LOCAL, 0); /* local frame */
3732 while (level--) {
3733 mk_pointer(&vtop->type);
3734 indir(); /* -> parent frame */
3735 }
3736 }
3737 break;
3738 #ifdef TCC_TARGET_X86_64
3739 #ifdef TCC_TARGET_PE
3740 case TOK_builtin_va_start:
3741 {
3742 next();
3743 skip('(');
3744 expr_eq();
3745 skip(',');
3746 expr_eq();
3747 skip(')');
3748 if ((vtop->r & VT_VALMASK) != VT_LOCAL)
3749 tcc_error("__builtin_va_start expects a local variable");
3750 vtop->r &= ~(VT_LVAL | VT_REF);
3751 vtop->type = char_pointer_type;
3752 vstore();
3753 }
3754 break;
3755 #else
3756 case TOK_builtin_va_arg_types:
3757 {
3758 CType type;
3759 int bt;
3760 next();
3761 skip('(');
3762 parse_type(&type);
3763 skip(')');
3764 vpushi(classify_x86_64_va_arg(&type));
3765 }
3766 break;
3767 #endif
3768 #endif
3769 case TOK_INC:
3770 case TOK_DEC:
3771 t = tok;
3772 next();
3773 unary();
3774 inc(0, t);
3775 break;
3776 case '-':
3777 next();
3778 vpushi(0);
3779 unary();
3780 gen_op('-');
3781 break;
3782 case TOK_LAND:
3783 if (!gnu_ext)
3784 goto tok_identifier;
3785 next();
3786 /* allow to take the address of a label */
3787 if (tok < TOK_UIDENT)
3788 expect("label identifier");
3789 s = label_find(tok);
3790 if (!s) {
3791 s = label_push(&global_label_stack, tok, LABEL_FORWARD);
3792 } else {
3793 if (s->r == LABEL_DECLARED)
3794 s->r = LABEL_FORWARD;
3795 }
3796 if (!s->type.t) {
3797 s->type.t = VT_VOID;
3798 mk_pointer(&s->type);
3799 s->type.t |= VT_STATIC;
3800 }
3801 vset(&s->type, VT_CONST | VT_SYM, 0);
3802 vtop->sym = s;
3803 next();
3804 break;
3805
3806 // special qnan , snan and infinity values
3807 case TOK___NAN__:
3808 vpush64(VT_DOUBLE, 0x7ff8000000000000ULL);
3809 next();
3810 break;
3811 case TOK___SNAN__:
3812 vpush64(VT_DOUBLE, 0x7ff0000000000001ULL);
3813 next();
3814 break;
3815 case TOK___INF__:
3816 vpush64(VT_DOUBLE, 0x7ff0000000000000ULL);
3817 next();
3818 break;
3819
3820 default:
3821 tok_identifier:
3822 t = tok;
3823 next();
3824 if (t < TOK_UIDENT)
3825 expect("identifier");
3826 s = sym_find(t);
3827 if (!s) {
3828 if (tok != '(')
3829 tcc_error("'%s' undeclared", get_tok_str(t, NULL));
3830 /* for simple function calls, we tolerate undeclared
3831 external reference to int() function */
3832 if (tcc_state->warn_implicit_function_declaration)
3833 tcc_warning("implicit declaration of function '%s'",
3834 get_tok_str(t, NULL));
3835 s = external_global_sym(t, &func_old_type, 0);
3836 }
3837 if ((s->type.t & (VT_STATIC | VT_INLINE | VT_BTYPE)) ==
3838 (VT_STATIC | VT_INLINE | VT_FUNC)) {
3839 /* if referencing an inline function, then we generate a
3840 symbol to it if not already done. It will have the
3841 effect to generate code for it at the end of the
3842 compilation unit. Inline function as always
3843 generated in the text section. */
3844 if (!s->c)
3845 put_extern_sym(s, text_section, 0, 0);
3846 r = VT_SYM | VT_CONST;
3847 } else {
3848 r = s->r;
3849 }
3850 vset(&s->type, r, s->c);
3851 /* if forward reference, we must point to s */
3852 if (vtop->r & VT_SYM) {
3853 vtop->sym = s;
3854 vtop->c.ul = 0;
3855 }
3856 break;
3857 }
3858
3859 /* post operations */
3860 while (1) {
3861 if (tok == TOK_INC || tok == TOK_DEC) {
3862 inc(1, tok);
3863 next();
3864 } else if (tok == '.' || tok == TOK_ARROW) {
3865 int qualifiers;
3866 /* field */
3867 if (tok == TOK_ARROW)
3868 indir();
3869 qualifiers = vtop->type.t & (VT_CONSTANT | VT_VOLATILE);
3870 test_lvalue();
3871 gaddrof();
3872 next();
3873 /* expect pointer on structure */
3874 if ((vtop->type.t & VT_BTYPE) != VT_STRUCT)
3875 expect("struct or union");
3876 s = vtop->type.ref;
3877 /* find field */
3878 tok |= SYM_FIELD;
3879 while ((s = s->next) != NULL) {
3880 if (s->v == tok)
3881 break;
3882 }
3883 if (!s)
3884 tcc_error("field not found: %s", get_tok_str(tok & ~SYM_FIELD, NULL));
3885 /* add field offset to pointer */
3886 vtop->type = char_pointer_type; /* change type to 'char *' */
3887 vpushi(s->c);
3888 gen_op('+');
3889 /* change type to field type, and set to lvalue */
3890 vtop->type = s->type;
3891 vtop->type.t |= qualifiers;
3892 /* an array is never an lvalue */
3893 if (!(vtop->type.t & VT_ARRAY)) {
3894 vtop->r |= lvalue_type(vtop->type.t);
3895 #ifdef CONFIG_TCC_BCHECK
3896 /* if bound checking, the referenced pointer must be checked */
3897 if (tcc_state->do_bounds_check)
3898 vtop->r |= VT_MUSTBOUND;
3899 #endif
3900 }
3901 next();
3902 } else if (tok == '[') {
3903 next();
3904 gexpr();
3905 gen_op('+');
3906 indir();
3907 skip(']');
3908 } else if (tok == '(') {
3909 SValue ret;
3910 Sym *sa;
3911 int nb_args, sret;
3912
3913 /* function call */
3914 if ((vtop->type.t & VT_BTYPE) != VT_FUNC) {
3915 /* pointer test (no array accepted) */
3916 if ((vtop->type.t & (VT_BTYPE | VT_ARRAY)) == VT_PTR) {
3917 vtop->type = *pointed_type(&vtop->type);
3918 if ((vtop->type.t & VT_BTYPE) != VT_FUNC)
3919 goto error_func;
3920 } else {
3921 error_func:
3922 expect("function pointer");
3923 }
3924 } else {
3925 vtop->r &= ~VT_LVAL; /* no lvalue */
3926 }
3927 /* get return type */
3928 s = vtop->type.ref;
3929 next();
3930 sa = s->next; /* first parameter */
3931 nb_args = 0;
3932 ret.r2 = VT_CONST;
3933 /* compute first implicit argument if a structure is returned */
3934 if ((s->type.t & VT_BTYPE) == VT_STRUCT) {
3935 int ret_align;
3936 sret = gfunc_sret(&s->type, &ret.type, &ret_align);
3937 if (sret) {
3938 /* get some space for the returned structure */
3939 size = type_size(&s->type, &align);
3940 loc = (loc - size) & -align;
3941 ret.type = s->type;
3942 ret.r = VT_LOCAL | VT_LVAL;
3943 /* pass it as 'int' to avoid structure arg passing
3944 problems */
3945 vseti(VT_LOCAL, loc);
3946 ret.c = vtop->c;
3947 nb_args++;
3948 }
3949 } else {
3950 sret = 0;
3951 ret.type = s->type;
3952 }
3953
3954 if (!sret) {
3955 /* return in register */
3956 if (is_float(ret.type.t)) {
3957 ret.r = reg_fret(ret.type.t);
3958 #ifdef TCC_TARGET_X86_64
3959 if ((ret.type.t & VT_BTYPE) == VT_QFLOAT)
3960 ret.r2 = REG_QRET;
3961 #endif
3962 } else {
3963 #ifdef TCC_TARGET_X86_64
3964 if ((ret.type.t & VT_BTYPE) == VT_QLONG)
3965 #else
3966 if ((ret.type.t & VT_BTYPE) == VT_LLONG)
3967 #endif
3968 ret.r2 = REG_LRET;
3969 ret.r = REG_IRET;
3970 }
3971 ret.c.i = 0;
3972 }
3973 if (tok != ')') {
3974 for(;;) {
3975 expr_eq();
3976 gfunc_param_typed(s, sa);
3977 nb_args++;
3978 if (sa)
3979 sa = sa->next;
3980 if (tok == ')')
3981 break;
3982 skip(',');
3983 }
3984 }
3985 if (sa)
3986 tcc_error("too few arguments to function");
3987 skip(')');
3988 if (!nocode_wanted) {
3989 gfunc_call(nb_args);
3990 } else {
3991 vtop -= (nb_args + 1);
3992 }
3993 /* return value */
3994 vsetc(&ret.type, ret.r, &ret.c);
3995 vtop->r2 = ret.r2;
3996 /* handle packed struct return */
3997 if (((s->type.t & VT_BTYPE) == VT_STRUCT) && !sret) {
3998 size = type_size(&s->type, &align);
3999 loc = (loc - size) & -align;
4000 int addr = loc;
4001 vset(&ret.type, VT_LOCAL | VT_LVAL, addr);
4002 vswap();
4003 vstore();
4004 vtop--;
4005 vset(&s->type, VT_LOCAL | VT_LVAL, addr);
4006 }
4007 } else {
4008 break;
4009 }
4010 }
4011 }
4012
4013 ST_FUNC void expr_prod(void)
4014 {
4015 int t;
4016
4017 unary();
4018 while (tok == '*' || tok == '/' || tok == '%') {
4019 t = tok;
4020 next();
4021 unary();
4022 gen_op(t);
4023 }
4024 }
4025
4026 ST_FUNC void expr_sum(void)
4027 {
4028 int t;
4029
4030 expr_prod();
4031 while (tok == '+' || tok == '-') {
4032 t = tok;
4033 next();
4034 expr_prod();
4035 gen_op(t);
4036 }
4037 }
4038
4039 static void expr_shift(void)
4040 {
4041 int t;
4042
4043 expr_sum();
4044 while (tok == TOK_SHL || tok == TOK_SAR) {
4045 t = tok;
4046 next();
4047 expr_sum();
4048 gen_op(t);
4049 }
4050 }
4051
4052 static void expr_cmp(void)
4053 {
4054 int t;
4055
4056 expr_shift();
4057 while ((tok >= TOK_ULE && tok <= TOK_GT) ||
4058 tok == TOK_ULT || tok == TOK_UGE) {
4059 t = tok;
4060 next();
4061 expr_shift();
4062 gen_op(t);
4063 }
4064 }
4065
4066 static void expr_cmpeq(void)
4067 {
4068 int t;
4069
4070 expr_cmp();
4071 while (tok == TOK_EQ || tok == TOK_NE) {
4072 t = tok;
4073 next();
4074 expr_cmp();
4075 gen_op(t);
4076 }
4077 }
4078
4079 static void expr_and(void)
4080 {
4081 expr_cmpeq();
4082 while (tok == '&') {
4083 next();
4084 expr_cmpeq();
4085 gen_op('&');
4086 }
4087 }
4088
4089 static void expr_xor(void)
4090 {
4091 expr_and();
4092 while (tok == '^') {
4093 next();
4094 expr_and();
4095 gen_op('^');
4096 }
4097 }
4098
4099 static void expr_or(void)
4100 {
4101 expr_xor();
4102 while (tok == '|') {
4103 next();
4104 expr_xor();
4105 gen_op('|');
4106 }
4107 }
4108
4109 /* XXX: fix this mess */
4110 static void expr_land_const(void)
4111 {
4112 expr_or();
4113 while (tok == TOK_LAND) {
4114 next();
4115 expr_or();
4116 gen_op(TOK_LAND);
4117 }
4118 }
4119
4120 /* XXX: fix this mess */
4121 static void expr_lor_const(void)
4122 {
4123 expr_land_const();
4124 while (tok == TOK_LOR) {
4125 next();
4126 expr_land_const();
4127 gen_op(TOK_LOR);
4128 }
4129 }
4130
4131 /* only used if non constant */
4132 static void expr_land(void)
4133 {
4134 int t;
4135
4136 expr_or();
4137 if (tok == TOK_LAND) {
4138 t = 0;
4139 save_regs(1);
4140 for(;;) {
4141 t = gtst(1, t);
4142 if (tok != TOK_LAND) {
4143 vseti(VT_JMPI, t);
4144 break;
4145 }
4146 next();
4147 expr_or();
4148 }
4149 }
4150 }
4151
4152 static void expr_lor(void)
4153 {
4154 int t;
4155
4156 expr_land();
4157 if (tok == TOK_LOR) {
4158 t = 0;
4159 save_regs(1);
4160 for(;;) {
4161 t = gtst(0, t);
4162 if (tok != TOK_LOR) {
4163 vseti(VT_JMP, t);
4164 break;
4165 }
4166 next();
4167 expr_land();
4168 }
4169 }
4170 }
4171
4172 /* XXX: better constant handling */
4173 static void expr_cond(void)
4174 {
4175 int tt, u, r1, r2, rc, t1, t2, bt1, bt2;
4176 SValue sv;
4177 CType type, type1, type2;
4178
4179 if (const_wanted) {
4180 expr_lor_const();
4181 if (tok == '?') {
4182 CType boolean;
4183 int c;
4184 boolean.t = VT_BOOL;
4185 vdup();
4186 gen_cast(&boolean);
4187 c = vtop->c.i;
4188 vpop();
4189 next();
4190 if (tok != ':' || !gnu_ext) {
4191 vpop();
4192 gexpr();
4193 }
4194 if (!c)
4195 vpop();
4196 skip(':');
4197 expr_cond();
4198 if (c)
4199 vpop();
4200 }
4201 } else {
4202 expr_lor();
4203 if (tok == '?') {
4204 next();
4205 if (vtop != vstack) {
4206 /* needed to avoid having different registers saved in
4207 each branch */
4208 if (is_float(vtop->type.t)) {
4209 rc = RC_FLOAT;
4210 #ifdef TCC_TARGET_X86_64
4211 if ((vtop->type.t & VT_BTYPE) == VT_LDOUBLE) {
4212 rc = RC_ST0;
4213 }
4214 #endif
4215 }
4216 else
4217 rc = RC_INT;
4218 gv(rc);
4219 save_regs(1);
4220 }
4221 if (tok == ':' && gnu_ext) {
4222 gv_dup();
4223 tt = gtst(1, 0);
4224 } else {
4225 tt = gtst(1, 0);
4226 gexpr();
4227 }
4228 type1 = vtop->type;
4229 sv = *vtop; /* save value to handle it later */
4230 vtop--; /* no vpop so that FP stack is not flushed */
4231 skip(':');
4232 u = gjmp(0);
4233 gsym(tt);
4234 expr_cond();
4235 type2 = vtop->type;
4236
4237 t1 = type1.t;
4238 bt1 = t1 & VT_BTYPE;
4239 t2 = type2.t;
4240 bt2 = t2 & VT_BTYPE;
4241 /* cast operands to correct type according to ISOC rules */
4242 if (is_float(bt1) || is_float(bt2)) {
4243 if (bt1 == VT_LDOUBLE || bt2 == VT_LDOUBLE) {
4244 type.t = VT_LDOUBLE;
4245 } else if (bt1 == VT_DOUBLE || bt2 == VT_DOUBLE) {
4246 type.t = VT_DOUBLE;
4247 } else {
4248 type.t = VT_FLOAT;
4249 }
4250 } else if (bt1 == VT_LLONG || bt2 == VT_LLONG) {
4251 /* cast to biggest op */
4252 type.t = VT_LLONG;
4253 /* convert to unsigned if it does not fit in a long long */
4254 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED) ||
4255 (t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED))
4256 type.t |= VT_UNSIGNED;
4257 } else if (bt1 == VT_PTR || bt2 == VT_PTR) {
4258 /* If one is a null ptr constant the result type
4259 is the other. */
4260 if (is_null_pointer (vtop))
4261 type = type1;
4262 else if (is_null_pointer (&sv))
4263 type = type2;
4264 /* XXX: test pointer compatibility, C99 has more elaborate
4265 rules here. */
4266 else
4267 type = type1;
4268 } else if (bt1 == VT_FUNC || bt2 == VT_FUNC) {
4269 /* XXX: test function pointer compatibility */
4270 type = bt1 == VT_FUNC ? type1 : type2;
4271 } else if (bt1 == VT_STRUCT || bt2 == VT_STRUCT) {
4272 /* XXX: test structure compatibility */
4273 type = bt1 == VT_STRUCT ? type1 : type2;
4274 } else if (bt1 == VT_VOID || bt2 == VT_VOID) {
4275 /* NOTE: as an extension, we accept void on only one side */
4276 type.t = VT_VOID;
4277 } else {
4278 /* integer operations */
4279 type.t = VT_INT;
4280 /* convert to unsigned if it does not fit in an integer */
4281 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED) ||
4282 (t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED))
4283 type.t |= VT_UNSIGNED;
4284 }
4285
4286 /* now we convert second operand */
4287 gen_cast(&type);
4288 if (VT_STRUCT == (vtop->type.t & VT_BTYPE))
4289 gaddrof();
4290 rc = RC_INT;
4291 if (is_float(type.t)) {
4292 rc = RC_FLOAT;
4293 #ifdef TCC_TARGET_X86_64
4294 if ((type.t & VT_BTYPE) == VT_LDOUBLE) {
4295 rc = RC_ST0;
4296 }
4297 #endif
4298 } else if ((type.t & VT_BTYPE) == VT_LLONG) {
4299 /* for long longs, we use fixed registers to avoid having
4300 to handle a complicated move */
4301 rc = RC_IRET;
4302 }
4303
4304 r2 = gv(rc);
4305 /* this is horrible, but we must also convert first
4306 operand */
4307 tt = gjmp(0);
4308 gsym(u);
4309 /* put again first value and cast it */
4310 *vtop = sv;
4311 gen_cast(&type);
4312 if (VT_STRUCT == (vtop->type.t & VT_BTYPE))
4313 gaddrof();
4314 r1 = gv(rc);
4315 move_reg(r2, r1, type.t);
4316 vtop->r = r2;
4317 gsym(tt);
4318 }
4319 }
4320 }
4321
4322 static void expr_eq(void)
4323 {
4324 int t;
4325
4326 expr_cond();
4327 if (tok == '=' ||
4328 (tok >= TOK_A_MOD && tok <= TOK_A_DIV) ||
4329 tok == TOK_A_XOR || tok == TOK_A_OR ||
4330 tok == TOK_A_SHL || tok == TOK_A_SAR) {
4331 test_lvalue();
4332 t = tok;
4333 next();
4334 if (t == '=') {
4335 expr_eq();
4336 } else {
4337 vdup();
4338 expr_eq();
4339 gen_op(t & 0x7f);
4340 }
4341 vstore();
4342 }
4343 }
4344
4345 ST_FUNC void gexpr(void)
4346 {
4347 while (1) {
4348 expr_eq();
4349 if (tok != ',')
4350 break;
4351 vpop();
4352 next();
4353 }
4354 }
4355
4356 /* parse an expression and return its type without any side effect. */
4357 static void expr_type(CType *type)
4358 {
4359 int saved_nocode_wanted;
4360
4361 saved_nocode_wanted = nocode_wanted;
4362 nocode_wanted = 1;
4363 gexpr();
4364 *type = vtop->type;
4365 vpop();
4366 nocode_wanted = saved_nocode_wanted;
4367 }
4368
4369 /* parse a unary expression and return its type without any side
4370 effect. */
4371 static void unary_type(CType *type)
4372 {
4373 int a;
4374
4375 a = nocode_wanted;
4376 nocode_wanted = 1;
4377 unary();
4378 *type = vtop->type;
4379 vpop();
4380 nocode_wanted = a;
4381 }
4382
4383 /* parse a constant expression and return value in vtop. */
4384 static void expr_const1(void)
4385 {
4386 int a;
4387 a = const_wanted;
4388 const_wanted = 1;
4389 expr_cond();
4390 const_wanted = a;
4391 }
4392
4393 /* parse an integer constant and return its value. */
4394 ST_FUNC int expr_const(void)
4395 {
4396 int c;
4397 expr_const1();
4398 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) != VT_CONST)
4399 expect("constant expression");
4400 c = vtop->c.i;
4401 vpop();
4402 return c;
4403 }
4404
4405 /* return the label token if current token is a label, otherwise
4406 return zero */
4407 static int is_label(void)
4408 {
4409 int last_tok;
4410
4411 /* fast test first */
4412 if (tok < TOK_UIDENT)
4413 return 0;
4414 /* no need to save tokc because tok is an identifier */
4415 last_tok = tok;
4416 next();
4417 if (tok == ':') {
4418 next();
4419 return last_tok;
4420 } else {
4421 unget_tok(last_tok);
4422 return 0;
4423 }
4424 }
4425
4426 static void label_or_decl(int l)
4427 {
4428 int last_tok;
4429
4430 /* fast test first */
4431 if (tok >= TOK_UIDENT)
4432 {
4433 /* no need to save tokc because tok is an identifier */
4434 last_tok = tok;
4435 next();
4436 if (tok == ':') {
4437 unget_tok(last_tok);
4438 return;
4439 }
4440 unget_tok(last_tok);
4441 }
4442 decl(l);
4443 }
4444
4445 static void block(int *bsym, int *csym, int *case_sym, int *def_sym,
4446 int case_reg, int is_expr)
4447 {
4448 int a, b, c, d;
4449 Sym *s, *frame_bottom;
4450
4451 /* generate line number info */
4452 if (tcc_state->do_debug &&
4453 (last_line_num != file->line_num || last_ind != ind)) {
4454 put_stabn(N_SLINE, 0, file->line_num, ind - func_ind);
4455 last_ind = ind;
4456 last_line_num = file->line_num;
4457 }
4458
4459 if (is_expr) {
4460 /* default return value is (void) */
4461 vpushi(0);
4462 vtop->type.t = VT_VOID;
4463 }
4464
4465 if (tok == TOK_IF) {
4466 /* if test */
4467 next();
4468 skip('(');
4469 gexpr();
4470 skip(')');
4471 a = gtst(1, 0);
4472 block(bsym, csym, case_sym, def_sym, case_reg, 0);
4473 c = tok;
4474 if (c == TOK_ELSE) {
4475 next();
4476 d = gjmp(0);
4477 gsym(a);
4478 block(bsym, csym, case_sym, def_sym, case_reg, 0);
4479 gsym(d); /* patch else jmp */
4480 } else
4481 gsym(a);
4482 } else if (tok == TOK_WHILE) {
4483 next();
4484 d = ind;
4485 skip('(');
4486 gexpr();
4487 skip(')');
4488 a = gtst(1, 0);
4489 b = 0;
4490 block(&a, &b, case_sym, def_sym, case_reg, 0);
4491 gjmp_addr(d);
4492 gsym(a);
4493 gsym_addr(b, d);
4494 } else if (tok == '{') {
4495 Sym *llabel;
4496
4497 next();
4498 /* record local declaration stack position */
4499 s = local_stack;
4500 frame_bottom = sym_push2(&local_stack, SYM_FIELD, 0, 0);
4501 frame_bottom->next = scope_stack_bottom;
4502 scope_stack_bottom = frame_bottom;
4503 llabel = local_label_stack;
4504
4505 /* save VLA state */
4506 int block_vla_sp_loc = *vla_sp_loc;
4507 int *saved_vla_sp_loc = vla_sp_loc;
4508 if (saved_vla_sp_loc != &vla_sp_root_loc)
4509 vla_sp_loc = &block_vla_sp_loc;
4510
4511 int saved_vla_flags = vla_flags;
4512 vla_flags |= VLA_NEED_NEW_FRAME;
4513
4514 /* handle local labels declarations */
4515 if (tok == TOK_LABEL) {
4516 next();
4517 for(;;) {
4518 if (tok < TOK_UIDENT)
4519 expect("label identifier");
4520 label_push(&local_label_stack, tok, LABEL_DECLARED);
4521 next();
4522 if (tok == ',') {
4523 next();
4524 } else {
4525 skip(';');
4526 break;
4527 }
4528 }
4529 }
4530 while (tok != '}') {
4531 label_or_decl(VT_LOCAL);
4532 if (tok != '}') {
4533 if (is_expr)
4534 vpop();
4535 block(bsym, csym, case_sym, def_sym, case_reg, is_expr);
4536 }
4537 }
4538 /* pop locally defined labels */
4539 label_pop(&local_label_stack, llabel);
4540 if(is_expr) {
4541 /* XXX: this solution makes only valgrind happy...
4542 triggered by gcc.c-torture/execute/20000917-1.c */
4543 Sym *p;
4544 switch(vtop->type.t & VT_BTYPE) {
4545 case VT_PTR:
4546 case VT_STRUCT:
4547 case VT_ENUM:
4548 case VT_FUNC:
4549 for(p=vtop->type.ref;p;p=p->prev)
4550 if(p->prev==s)
4551 tcc_error("unsupported expression type");
4552 }
4553 }
4554 /* pop locally defined symbols */
4555 scope_stack_bottom = scope_stack_bottom->next;
4556 sym_pop(&local_stack, s);
4557
4558 /* Pop VLA frames and restore stack pointer if required */
4559 if (saved_vla_sp_loc != &vla_sp_root_loc)
4560 *saved_vla_sp_loc = block_vla_sp_loc;
4561 if (vla_sp_loc != (saved_vla_sp_loc == &vla_sp_root_loc ? &vla_sp_root_loc : &block_vla_sp_loc)) {
4562 vla_sp_loc = saved_vla_sp_loc;
4563 gen_vla_sp_restore(*vla_sp_loc);
4564 }
4565 vla_flags = (vla_flags & ~VLA_SCOPE_FLAGS) | (saved_vla_flags & VLA_SCOPE_FLAGS);
4566
4567 next();
4568 } else if (tok == TOK_RETURN) {
4569 next();
4570 if (tok != ';') {
4571 gexpr();
4572 gen_assign_cast(&func_vt);
4573 if ((func_vt.t & VT_BTYPE) == VT_STRUCT) {
4574 CType type, ret_type;
4575 int ret_align;
4576 if (gfunc_sret(&func_vt, &ret_type, &ret_align)) {
4577 /* if returning structure, must copy it to implicit
4578 first pointer arg location */
4579 type = func_vt;
4580 mk_pointer(&type);
4581 vset(&type, VT_LOCAL | VT_LVAL, func_vc);
4582 indir();
4583 vswap();
4584 /* copy structure value to pointer */
4585 vstore();
4586 } else {
4587 /* returning structure packed into registers */
4588 int size, addr, align;
4589 size = type_size(&func_vt,&align);
4590 if ((vtop->r != (VT_LOCAL | VT_LVAL) || (vtop->c.i & (ret_align-1)))
4591 && (align & (ret_align-1))) {
4592 loc = (loc - size) & -align;
4593 addr = loc;
4594 type = func_vt;
4595 vset(&type, VT_LOCAL | VT_LVAL, addr);
4596 vswap();
4597 vstore();
4598 vset(&ret_type, VT_LOCAL | VT_LVAL, addr);
4599 }
4600 vtop->type = ret_type;
4601 if (is_float(ret_type.t))
4602 gv(rc_fret(ret_type.t));
4603 else
4604 gv(RC_IRET);
4605 }
4606 } else if (is_float(func_vt.t)) {
4607 gv(rc_fret(func_vt.t));
4608 } else {
4609 gv(RC_IRET);
4610 }
4611 vtop--; /* NOT vpop() because on x86 it would flush the fp stack */
4612 }
4613 skip(';');
4614 rsym = gjmp(rsym); /* jmp */
4615 } else if (tok == TOK_BREAK) {
4616 /* compute jump */
4617 if (!bsym)
4618 tcc_error("cannot break");
4619 *bsym = gjmp(*bsym);
4620 next();
4621 skip(';');
4622 } else if (tok == TOK_CONTINUE) {
4623 /* compute jump */
4624 if (!csym)
4625 tcc_error("cannot continue");
4626 *csym = gjmp(*csym);
4627 next();
4628 skip(';');
4629 } else if (tok == TOK_FOR) {
4630 int e;
4631 next();
4632 skip('(');
4633 s = local_stack;
4634 frame_bottom = sym_push2(&local_stack, SYM_FIELD, 0, 0);
4635 frame_bottom->next = scope_stack_bottom;
4636 scope_stack_bottom = frame_bottom;
4637 if (tok != ';') {
4638 /* c99 for-loop init decl? */
4639 if (!decl0(VT_LOCAL, 1)) {
4640 /* no, regular for-loop init expr */
4641 gexpr();
4642 vpop();
4643 }
4644 }
4645 skip(';');
4646 d = ind;
4647 c = ind;
4648 a = 0;
4649 b = 0;
4650 if (tok != ';') {
4651 gexpr();
4652 a = gtst(1, 0);
4653 }
4654 skip(';');
4655 if (tok != ')') {
4656 e = gjmp(0);
4657 c = ind;
4658 gexpr();
4659 vpop();
4660 gjmp_addr(d);
4661 gsym(e);
4662 }
4663 skip(')');
4664 block(&a, &b, case_sym, def_sym, case_reg, 0);
4665 gjmp_addr(c);
4666 gsym(a);
4667 gsym_addr(b, c);
4668 scope_stack_bottom = scope_stack_bottom->next;
4669 sym_pop(&local_stack, s);
4670 } else
4671 if (tok == TOK_DO) {
4672 next();
4673 a = 0;
4674 b = 0;
4675 d = ind;
4676 block(&a, &b, case_sym, def_sym, case_reg, 0);
4677 skip(TOK_WHILE);
4678 skip('(');
4679 gsym(b);
4680 gexpr();
4681 c = gtst(0, 0);
4682 gsym_addr(c, d);
4683 skip(')');
4684 gsym(a);
4685 skip(';');
4686 } else
4687 if (tok == TOK_SWITCH) {
4688 next();
4689 skip('(');
4690 gexpr();
4691 /* XXX: other types than integer */
4692 case_reg = gv(RC_INT);
4693 vpop();
4694 skip(')');
4695 a = 0;
4696 b = gjmp(0); /* jump to first case */
4697 c = 0;
4698 block(&a, csym, &b, &c, case_reg, 0);
4699 /* if no default, jmp after switch */
4700 if (c == 0)
4701 c = ind;
4702 /* default label */
4703 gsym_addr(b, c);
4704 /* break label */
4705 gsym(a);
4706 } else
4707 if (tok == TOK_CASE) {
4708 int v1, v2;
4709 if (!case_sym)
4710 expect("switch");
4711 next();
4712 v1 = expr_const();
4713 v2 = v1;
4714 if (gnu_ext && tok == TOK_DOTS) {
4715 next();
4716 v2 = expr_const();
4717 if (v2 < v1)
4718 tcc_warning("empty case range");
4719 }
4720 /* since a case is like a label, we must skip it with a jmp */
4721 b = gjmp(0);
4722 gsym(*case_sym);
4723 vseti(case_reg, 0);
4724 vpushi(v1);
4725 if (v1 == v2) {
4726 gen_op(TOK_EQ);
4727 *case_sym = gtst(1, 0);
4728 } else {
4729 gen_op(TOK_GE);
4730 *case_sym = gtst(1, 0);
4731 vseti(case_reg, 0);
4732 vpushi(v2);
4733 gen_op(TOK_LE);
4734 *case_sym = gtst(1, *case_sym);
4735 }
4736 gsym(b);
4737 skip(':');
4738 is_expr = 0;
4739 goto block_after_label;
4740 } else
4741 if (tok == TOK_DEFAULT) {
4742 next();
4743 skip(':');
4744 if (!def_sym)
4745 expect("switch");
4746 if (*def_sym)
4747 tcc_error("too many 'default'");
4748 *def_sym = ind;
4749 is_expr = 0;
4750 goto block_after_label;
4751 } else
4752 if (tok == TOK_GOTO) {
4753 next();
4754 if (tok == '*' && gnu_ext) {
4755 /* computed goto */
4756 next();
4757 gexpr();
4758 if ((vtop->type.t & VT_BTYPE) != VT_PTR)
4759 expect("pointer");
4760 ggoto();
4761 } else if (tok >= TOK_UIDENT) {
4762 s = label_find(tok);
4763 /* put forward definition if needed */
4764 if (!s) {
4765 s = label_push(&global_label_stack, tok, LABEL_FORWARD);
4766 } else {
4767 if (s->r == LABEL_DECLARED)
4768 s->r = LABEL_FORWARD;
4769 }
4770 /* label already defined */
4771 if (vla_flags & VLA_IN_SCOPE) {
4772 /* If VLAs are in use, save the current stack pointer and
4773 reset the stack pointer to what it was at function entry
4774 (label will restore stack pointer in inner scopes) */
4775 vla_sp_save();
4776 gen_vla_sp_restore(vla_sp_root_loc);
4777 }
4778 if (s->r & LABEL_FORWARD)
4779 s->jnext = gjmp(s->jnext);
4780 else
4781 gjmp_addr(s->jnext);
4782 next();
4783 } else {
4784 expect("label identifier");
4785 }
4786 skip(';');
4787 } else if (tok == TOK_ASM1 || tok == TOK_ASM2 || tok == TOK_ASM3) {
4788 asm_instr();
4789 } else {
4790 b = is_label();
4791 if (b) {
4792 /* label case */
4793 if (vla_flags & VLA_IN_SCOPE) {
4794 /* save/restore stack pointer across label
4795 this is a no-op when combined with the load immediately
4796 after the label unless we arrive via goto */
4797 vla_sp_save();
4798 }
4799 s = label_find(b);
4800 if (s) {
4801 if (s->r == LABEL_DEFINED)
4802 tcc_error("duplicate label '%s'", get_tok_str(s->v, NULL));
4803 gsym(s->jnext);
4804 s->r = LABEL_DEFINED;
4805 } else {
4806 s = label_push(&global_label_stack, b, LABEL_DEFINED);
4807 }
4808 s->jnext = ind;
4809 if (vla_flags & VLA_IN_SCOPE) {
4810 gen_vla_sp_restore(*vla_sp_loc);
4811 vla_flags |= VLA_NEED_NEW_FRAME;
4812 }
4813 /* we accept this, but it is a mistake */
4814 block_after_label:
4815 if (tok == '}') {
4816 tcc_warning("deprecated use of label at end of compound statement");
4817 } else {
4818 if (is_expr)
4819 vpop();
4820 block(bsym, csym, case_sym, def_sym, case_reg, is_expr);
4821 }
4822 } else {
4823 /* expression case */
4824 if (tok != ';') {
4825 if (is_expr) {
4826 vpop();
4827 gexpr();
4828 } else {
4829 gexpr();
4830 vpop();
4831 }
4832 }
4833 skip(';');
4834 }
4835 }
4836 }
4837
4838 /* t is the array or struct type. c is the array or struct
4839 address. cur_index/cur_field is the pointer to the current
4840 value. 'size_only' is true if only size info is needed (only used
4841 in arrays) */
4842 static void decl_designator(CType *type, Section *sec, unsigned long c,
4843 int *cur_index, Sym **cur_field,
4844 int size_only)
4845 {
4846 Sym *s, *f;
4847 int notfirst, index, index_last, align, l, nb_elems, elem_size;
4848 CType type1;
4849
4850 notfirst = 0;
4851 elem_size = 0;
4852 nb_elems = 1;
4853 if (gnu_ext && (l = is_label()) != 0)
4854 goto struct_field;
4855 while (tok == '[' || tok == '.') {
4856 if (tok == '[') {
4857 if (!(type->t & VT_ARRAY))
4858 expect("array type");
4859 s = type->ref;
4860 next();
4861 index = expr_const();
4862 if (index < 0 || (s->c >= 0 && index >= s->c))
4863 expect("invalid index");
4864 if (tok == TOK_DOTS && gnu_ext) {
4865 next();
4866 index_last = expr_const();
4867 if (index_last < 0 ||
4868 (s->c >= 0 && index_last >= s->c) ||
4869 index_last < index)
4870 expect("invalid index");
4871 } else {
4872 index_last = index;
4873 }
4874 skip(']');
4875 if (!notfirst)
4876 *cur_index = index_last;
4877 type = pointed_type(type);
4878 elem_size = type_size(type, &align);
4879 c += index * elem_size;
4880 /* NOTE: we only support ranges for last designator */
4881 nb_elems = index_last - index + 1;
4882 if (nb_elems != 1) {
4883 notfirst = 1;
4884 break;
4885 }
4886 } else {
4887 next();
4888 l = tok;
4889 next();
4890 struct_field:
4891 if ((type->t & VT_BTYPE) != VT_STRUCT)
4892 expect("struct/union type");
4893 s = type->ref;
4894 l |= SYM_FIELD;
4895 f = s->next;
4896 while (f) {
4897 if (f->v == l)
4898 break;
4899 f = f->next;
4900 }
4901 if (!f)
4902 expect("field");
4903 if (!notfirst)
4904 *cur_field = f;
4905 /* XXX: fix this mess by using explicit storage field */
4906 type1 = f->type;
4907 type1.t |= (type->t & ~VT_TYPE);
4908 type = &type1;
4909 c += f->c;
4910 }
4911 notfirst = 1;
4912 }
4913 if (notfirst) {
4914 if (tok == '=') {
4915 next();
4916 } else {
4917 if (!gnu_ext)
4918 expect("=");
4919 }
4920 } else {
4921 if (type->t & VT_ARRAY) {
4922 index = *cur_index;
4923 type = pointed_type(type);
4924 c += index * type_size(type, &align);
4925 } else {
4926 f = *cur_field;
4927 if (!f)
4928 tcc_error("too many field init");
4929 /* XXX: fix this mess by using explicit storage field */
4930 type1 = f->type;
4931 type1.t |= (type->t & ~VT_TYPE);
4932 type = &type1;
4933 c += f->c;
4934 }
4935 }
4936 decl_initializer(type, sec, c, 0, size_only);
4937
4938 /* XXX: make it more general */
4939 if (!size_only && nb_elems > 1) {
4940 unsigned long c_end;
4941 uint8_t *src, *dst;
4942 int i;
4943
4944 if (!sec)
4945 tcc_error("range init not supported yet for dynamic storage");
4946 c_end = c + nb_elems * elem_size;
4947 if (c_end > sec->data_allocated)
4948 section_realloc(sec, c_end);
4949 src = sec->data + c;
4950 dst = src;
4951 for(i = 1; i < nb_elems; i++) {
4952 dst += elem_size;
4953 memcpy(dst, src, elem_size);
4954 }
4955 }
4956 }
4957
4958 #define EXPR_VAL 0
4959 #define EXPR_CONST 1
4960 #define EXPR_ANY 2
4961
4962 /* store a value or an expression directly in global data or in local array */
4963 static void init_putv(CType *type, Section *sec, unsigned long c,
4964 int v, int expr_type)
4965 {
4966 int saved_global_expr, bt, bit_pos, bit_size;
4967 void *ptr;
4968 unsigned long long bit_mask;
4969 CType dtype;
4970
4971 switch(expr_type) {
4972 case EXPR_VAL:
4973 vpushi(v);
4974 break;
4975 case EXPR_CONST:
4976 /* compound literals must be allocated globally in this case */
4977 saved_global_expr = global_expr;
4978 global_expr = 1;
4979 expr_const1();
4980 global_expr = saved_global_expr;
4981 /* NOTE: symbols are accepted */
4982 if ((vtop->r & (VT_VALMASK | VT_LVAL)) != VT_CONST)
4983 tcc_error("initializer element is not constant");
4984 break;
4985 case EXPR_ANY:
4986 expr_eq();
4987 break;
4988 }
4989
4990 dtype = *type;
4991 dtype.t &= ~VT_CONSTANT; /* need to do that to avoid false warning */
4992
4993 if (sec) {
4994 /* XXX: not portable */
4995 /* XXX: generate error if incorrect relocation */
4996 gen_assign_cast(&dtype);
4997 bt = type->t & VT_BTYPE;
4998 /* we'll write at most 12 bytes */
4999 if (c + 12 > sec->data_allocated) {
5000 section_realloc(sec, c + 12);
5001 }
5002 ptr = sec->data + c;
5003 /* XXX: make code faster ? */
5004 if (!(type->t & VT_BITFIELD)) {
5005 bit_pos = 0;
5006 bit_size = 32;
5007 bit_mask = -1LL;
5008 } else {
5009 bit_pos = (vtop->type.t >> VT_STRUCT_SHIFT) & 0x3f;
5010 bit_size = (vtop->type.t >> (VT_STRUCT_SHIFT + 6)) & 0x3f;
5011 bit_mask = (1LL << bit_size) - 1;
5012 }
5013 if ((vtop->r & VT_SYM) &&
5014 (bt == VT_BYTE ||
5015 bt == VT_SHORT ||
5016 bt == VT_DOUBLE ||
5017 bt == VT_LDOUBLE ||
5018 bt == VT_LLONG ||
5019 (bt == VT_INT && bit_size != 32)))
5020 tcc_error("initializer element is not computable at load time");
5021 switch(bt) {
5022 case VT_BOOL:
5023 vtop->c.i = (vtop->c.i != 0);
5024 case VT_BYTE:
5025 *(char *)ptr |= (vtop->c.i & bit_mask) << bit_pos;
5026 break;
5027 case VT_SHORT:
5028 *(short *)ptr |= (vtop->c.i & bit_mask) << bit_pos;
5029 break;
5030 case VT_DOUBLE:
5031 *(double *)ptr = vtop->c.d;
5032 break;
5033 case VT_LDOUBLE:
5034 *(long double *)ptr = vtop->c.ld;
5035 break;
5036 case VT_LLONG:
5037 *(long long *)ptr |= (vtop->c.ll & bit_mask) << bit_pos;
5038 break;
5039 default:
5040 if (vtop->r & VT_SYM) {
5041 greloc(sec, vtop->sym, c, R_DATA_PTR);
5042 }
5043 *(int *)ptr |= (vtop->c.i & bit_mask) << bit_pos;
5044 break;
5045 }
5046 vtop--;
5047 } else {
5048 vset(&dtype, VT_LOCAL|VT_LVAL, c);
5049 vswap();
5050 vstore();
5051 vpop();
5052 }
5053 }
5054
5055 /* put zeros for variable based init */
5056 static void init_putz(CType *t, Section *sec, unsigned long c, int size)
5057 {
5058 if (sec) {
5059 /* nothing to do because globals are already set to zero */
5060 } else {
5061 vpush_global_sym(&func_old_type, TOK_memset);
5062 vseti(VT_LOCAL, c);
5063 vpushi(0);
5064 vpushs(size);
5065 gfunc_call(3);
5066 }
5067 }
5068
5069 /* 't' contains the type and storage info. 'c' is the offset of the
5070 object in section 'sec'. If 'sec' is NULL, it means stack based
5071 allocation. 'first' is true if array '{' must be read (multi
5072 dimension implicit array init handling). 'size_only' is true if
5073 size only evaluation is wanted (only for arrays). */
5074 static void decl_initializer(CType *type, Section *sec, unsigned long c,
5075 int first, int size_only)
5076 {
5077 int index, array_length, n, no_oblock, nb, parlevel, parlevel1, i;
5078 int size1, align1, expr_type;
5079 Sym *s, *f;
5080 CType *t1;
5081
5082 if (type->t & VT_VLA) {
5083 int a;
5084
5085 /* save current stack pointer */
5086 if (vla_flags & VLA_NEED_NEW_FRAME) {
5087 vla_sp_save();
5088 vla_flags = VLA_IN_SCOPE;
5089 vla_sp_loc = &vla_sp_loc_tmp;
5090 }
5091
5092 vla_runtime_type_size(type, &a);
5093 gen_vla_alloc(type, a);
5094 vset(type, VT_LOCAL|VT_LVAL, c);
5095 vswap();
5096 vstore();
5097 vpop();
5098 } else if (type->t & VT_ARRAY) {
5099 s = type->ref;
5100 n = s->c;
5101 array_length = 0;
5102 t1 = pointed_type(type);
5103 size1 = type_size(t1, &align1);
5104
5105 no_oblock = 1;
5106 if ((first && tok != TOK_LSTR && tok != TOK_STR) ||
5107 tok == '{') {
5108 if (tok != '{')
5109 tcc_error("character array initializer must be a literal,"
5110 " optionally enclosed in braces");
5111 skip('{');
5112 no_oblock = 0;
5113 }
5114
5115 /* only parse strings here if correct type (otherwise: handle
5116 them as ((w)char *) expressions */
5117 if ((tok == TOK_LSTR &&
5118 #ifdef TCC_TARGET_PE
5119 (t1->t & VT_BTYPE) == VT_SHORT && (t1->t & VT_UNSIGNED)
5120 #else
5121 (t1->t & VT_BTYPE) == VT_INT
5122 #endif
5123 ) || (tok == TOK_STR && (t1->t & VT_BTYPE) == VT_BYTE)) {
5124 while (tok == TOK_STR || tok == TOK_LSTR) {
5125 int cstr_len, ch;
5126 CString *cstr;
5127
5128 cstr = tokc.cstr;
5129 /* compute maximum number of chars wanted */
5130 if (tok == TOK_STR)
5131 cstr_len = cstr->size;
5132 else
5133 cstr_len = cstr->size / sizeof(nwchar_t);
5134 cstr_len--;
5135 nb = cstr_len;
5136 if (n >= 0 && nb > (n - array_length))
5137 nb = n - array_length;
5138 if (!size_only) {
5139 if (cstr_len > nb)
5140 tcc_warning("initializer-string for array is too long");
5141 /* in order to go faster for common case (char
5142 string in global variable, we handle it
5143 specifically */
5144 if (sec && tok == TOK_STR && size1 == 1) {
5145 memcpy(sec->data + c + array_length, cstr->data, nb);
5146 } else {
5147 for(i=0;i<nb;i++) {
5148 if (tok == TOK_STR)
5149 ch = ((unsigned char *)cstr->data)[i];
5150 else
5151 ch = ((nwchar_t *)cstr->data)[i];
5152 init_putv(t1, sec, c + (array_length + i) * size1,
5153 ch, EXPR_VAL);
5154 }
5155 }
5156 }
5157 array_length += nb;
5158 next();
5159 }
5160 /* only add trailing zero if enough storage (no
5161 warning in this case since it is standard) */
5162 if (n < 0 || array_length < n) {
5163 if (!size_only) {
5164 init_putv(t1, sec, c + (array_length * size1), 0, EXPR_VAL);
5165 }
5166 array_length++;
5167 }
5168 } else {
5169 index = 0;
5170 while (tok != '}') {
5171 decl_designator(type, sec, c, &index, NULL, size_only);
5172 if (n >= 0 && index >= n)
5173 tcc_error("index too large");
5174 /* must put zero in holes (note that doing it that way
5175 ensures that it even works with designators) */
5176 if (!size_only && array_length < index) {
5177 init_putz(t1, sec, c + array_length * size1,
5178 (index - array_length) * size1);
5179 }
5180 index++;
5181 if (index > array_length)
5182 array_length = index;
5183 /* special test for multi dimensional arrays (may not
5184 be strictly correct if designators are used at the
5185 same time) */
5186 if (index >= n && no_oblock)
5187 break;
5188 if (tok == '}')
5189 break;
5190 skip(',');
5191 }
5192 }
5193 if (!no_oblock)
5194 skip('}');
5195 /* put zeros at the end */
5196 if (!size_only && n >= 0 && array_length < n) {
5197 init_putz(t1, sec, c + array_length * size1,
5198 (n - array_length) * size1);
5199 }
5200 /* patch type size if needed */
5201 if (n < 0)
5202 s->c = array_length;
5203 } else if ((type->t & VT_BTYPE) == VT_STRUCT &&
5204 (sec || !first || tok == '{')) {
5205 int par_count;
5206
5207 /* NOTE: the previous test is a specific case for automatic
5208 struct/union init */
5209 /* XXX: union needs only one init */
5210
5211 /* XXX: this test is incorrect for local initializers
5212 beginning with ( without {. It would be much more difficult
5213 to do it correctly (ideally, the expression parser should
5214 be used in all cases) */
5215 par_count = 0;
5216 if (tok == '(') {
5217 AttributeDef ad1;
5218 CType type1;
5219 next();
5220 while (tok == '(') {
5221 par_count++;
5222 next();
5223 }
5224 if (!parse_btype(&type1, &ad1))
5225 expect("cast");
5226 type_decl(&type1, &ad1, &n, TYPE_ABSTRACT);
5227 #if 0
5228 if (!is_assignable_types(type, &type1))
5229 tcc_error("invalid type for cast");
5230 #endif
5231 skip(')');
5232 }
5233 no_oblock = 1;
5234 if (first || tok == '{') {
5235 skip('{');
5236 no_oblock = 0;
5237 }
5238 s = type->ref;
5239 f = s->next;
5240 array_length = 0;
5241 index = 0;
5242 n = s->c;
5243 while (tok != '}') {
5244 decl_designator(type, sec, c, NULL, &f, size_only);
5245 index = f->c;
5246 if (!size_only && array_length < index) {
5247 init_putz(type, sec, c + array_length,
5248 index - array_length);
5249 }
5250 index = index + type_size(&f->type, &align1);
5251 if (index > array_length)
5252 array_length = index;
5253
5254 /* gr: skip fields from same union - ugly. */
5255 while (f->next) {
5256 ///printf("index: %2d %08x -- %2d %08x\n", f->c, f->type.t, f->next->c, f->next->type.t);
5257 /* test for same offset */
5258 if (f->next->c != f->c)
5259 break;
5260 /* if yes, test for bitfield shift */
5261 if ((f->type.t & VT_BITFIELD) && (f->next->type.t & VT_BITFIELD)) {
5262 int bit_pos_1 = (f->type.t >> VT_STRUCT_SHIFT) & 0x3f;
5263 int bit_pos_2 = (f->next->type.t >> VT_STRUCT_SHIFT) & 0x3f;
5264 //printf("bitfield %d %d\n", bit_pos_1, bit_pos_2);
5265 if (bit_pos_1 != bit_pos_2)
5266 break;
5267 }
5268 f = f->next;
5269 }
5270
5271 f = f->next;
5272 if (no_oblock && f == NULL)
5273 break;
5274 if (tok == '}')
5275 break;
5276 skip(',');
5277 }
5278 /* put zeros at the end */
5279 if (!size_only && array_length < n) {
5280 init_putz(type, sec, c + array_length,
5281 n - array_length);
5282 }
5283 if (!no_oblock)
5284 skip('}');
5285 while (par_count) {
5286 skip(')');
5287 par_count--;
5288 }
5289 } else if (tok == '{') {
5290 next();
5291 decl_initializer(type, sec, c, first, size_only);
5292 skip('}');
5293 } else if (size_only) {
5294 /* just skip expression */
5295 parlevel = parlevel1 = 0;
5296 while ((parlevel > 0 || parlevel1 > 0 ||
5297 (tok != '}' && tok != ',')) && tok != -1) {
5298 if (tok == '(')
5299 parlevel++;
5300 else if (tok == ')')
5301 parlevel--;
5302 else if (tok == '{')
5303 parlevel1++;
5304 else if (tok == '}')
5305 parlevel1--;
5306 next();
5307 }
5308 } else {
5309 /* currently, we always use constant expression for globals
5310 (may change for scripting case) */
5311 expr_type = EXPR_CONST;
5312 if (!sec)
5313 expr_type = EXPR_ANY;
5314 init_putv(type, sec, c, 0, expr_type);
5315 }
5316 }
5317
5318 /* parse an initializer for type 't' if 'has_init' is non zero, and
5319 allocate space in local or global data space ('r' is either
5320 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
5321 variable 'v' with an associated name represented by 'asm_label' of
5322 scope 'scope' is declared before initializers are parsed. If 'v' is
5323 zero, then a reference to the new object is put in the value stack.
5324 If 'has_init' is 2, a special parsing is done to handle string
5325 constants. */
5326 static void decl_initializer_alloc(CType *type, AttributeDef *ad, int r,
5327 int has_init, int v, char *asm_label,
5328 int scope)
5329 {
5330 int size, align, addr, data_offset;
5331 int level;
5332 ParseState saved_parse_state = {0};
5333 TokenString init_str;
5334 Section *sec;
5335 Sym *flexible_array;
5336
5337 flexible_array = NULL;
5338 if ((type->t & VT_BTYPE) == VT_STRUCT) {
5339 Sym *field;
5340 field = type->ref;
5341 while (field && field->next)
5342 field = field->next;
5343 if (field->type.t & VT_ARRAY && field->type.ref->c < 0)
5344 flexible_array = field;
5345 }
5346
5347 size = type_size(type, &align);
5348 /* If unknown size, we must evaluate it before
5349 evaluating initializers because
5350 initializers can generate global data too
5351 (e.g. string pointers or ISOC99 compound
5352 literals). It also simplifies local
5353 initializers handling */
5354 tok_str_new(&init_str);
5355 if (size < 0 || (flexible_array && has_init)) {
5356 if (!has_init)
5357 tcc_error("unknown type size");
5358 /* get all init string */
5359 if (has_init == 2) {
5360 /* only get strings */
5361 while (tok == TOK_STR || tok == TOK_LSTR) {
5362 tok_str_add_tok(&init_str);
5363 next();
5364 }
5365 } else {
5366 level = 0;
5367 while (level > 0 || (tok != ',' && tok != ';')) {
5368 if (tok < 0)
5369 tcc_error("unexpected end of file in initializer");
5370 tok_str_add_tok(&init_str);
5371 if (tok == '{')
5372 level++;
5373 else if (tok == '}') {
5374 level--;
5375 if (level <= 0) {
5376 next();
5377 break;
5378 }
5379 }
5380 next();
5381 }
5382 }
5383 tok_str_add(&init_str, -1);
5384 tok_str_add(&init_str, 0);
5385
5386 /* compute size */
5387 save_parse_state(&saved_parse_state);
5388
5389 macro_ptr = init_str.str;
5390 next();
5391 decl_initializer(type, NULL, 0, 1, 1);
5392 /* prepare second initializer parsing */
5393 macro_ptr = init_str.str;
5394 next();
5395
5396 /* if still unknown size, error */
5397 size = type_size(type, &align);
5398 if (size < 0)
5399 tcc_error("unknown type size");
5400 }
5401 if (flexible_array)
5402 size += flexible_array->type.ref->c * pointed_size(&flexible_array->type);
5403 /* take into account specified alignment if bigger */
5404 if (ad->aligned) {
5405 if (ad->aligned > align)
5406 align = ad->aligned;
5407 } else if (ad->packed) {
5408 align = 1;
5409 }
5410 if ((r & VT_VALMASK) == VT_LOCAL) {
5411 sec = NULL;
5412 #ifdef CONFIG_TCC_BCHECK
5413 if (tcc_state->do_bounds_check && (type->t & VT_ARRAY)) {
5414 loc--;
5415 }
5416 #endif
5417 loc = (loc - size) & -align;
5418 addr = loc;
5419 #ifdef CONFIG_TCC_BCHECK
5420 /* handles bounds */
5421 /* XXX: currently, since we do only one pass, we cannot track
5422 '&' operators, so we add only arrays */
5423 if (tcc_state->do_bounds_check && (type->t & VT_ARRAY)) {
5424 unsigned long *bounds_ptr;
5425 /* add padding between regions */
5426 loc--;
5427 /* then add local bound info */
5428 bounds_ptr = section_ptr_add(lbounds_section, 2 * sizeof(unsigned long));
5429 bounds_ptr[0] = addr;
5430 bounds_ptr[1] = size;
5431 }
5432 #endif
5433 if (v) {
5434 /* local variable */
5435 sym_push(v, type, r, addr);
5436 } else {
5437 /* push local reference */
5438 vset(type, r, addr);
5439 }
5440 } else {
5441 Sym *sym;
5442
5443 sym = NULL;
5444 if (v && scope == VT_CONST) {
5445 /* see if the symbol was already defined */
5446 sym = sym_find(v);
5447 if (sym) {
5448 if (!is_compatible_types(&sym->type, type))
5449 tcc_error("incompatible types for redefinition of '%s'",
5450 get_tok_str(v, NULL));
5451 if (sym->type.t & VT_EXTERN) {
5452 /* if the variable is extern, it was not allocated */
5453 sym->type.t &= ~VT_EXTERN;
5454 /* set array size if it was ommited in extern
5455 declaration */
5456 if ((sym->type.t & VT_ARRAY) &&
5457 sym->type.ref->c < 0 &&
5458 type->ref->c >= 0)
5459 sym->type.ref->c = type->ref->c;
5460 } else {
5461 /* we accept several definitions of the same
5462 global variable. this is tricky, because we
5463 must play with the SHN_COMMON type of the symbol */
5464 /* XXX: should check if the variable was already
5465 initialized. It is incorrect to initialized it
5466 twice */
5467 /* no init data, we won't add more to the symbol */
5468 if (!has_init)
5469 goto no_alloc;
5470 }
5471 }
5472 }
5473
5474 /* allocate symbol in corresponding section */
5475 sec = ad->section;
5476 if (!sec) {
5477 if (has_init)
5478 sec = data_section;
5479 else if (tcc_state->nocommon)
5480 sec = bss_section;
5481 }
5482 if (sec) {
5483 data_offset = sec->data_offset;
5484 data_offset = (data_offset + align - 1) & -align;
5485 addr = data_offset;
5486 /* very important to increment global pointer at this time
5487 because initializers themselves can create new initializers */
5488 data_offset += size;
5489 #ifdef CONFIG_TCC_BCHECK
5490 /* add padding if bound check */
5491 if (tcc_state->do_bounds_check)
5492 data_offset++;
5493 #endif
5494 sec->data_offset = data_offset;
5495 /* allocate section space to put the data */
5496 if (sec->sh_type != SHT_NOBITS &&
5497 data_offset > sec->data_allocated)
5498 section_realloc(sec, data_offset);
5499 /* align section if needed */
5500 if (align > sec->sh_addralign)
5501 sec->sh_addralign = align;
5502 } else {
5503 addr = 0; /* avoid warning */
5504 }
5505
5506 if (v) {
5507 if (scope != VT_CONST || !sym) {
5508 sym = sym_push(v, type, r | VT_SYM, 0);
5509 sym->asm_label = asm_label;
5510 }
5511 /* update symbol definition */
5512 if (sec) {
5513 put_extern_sym(sym, sec, addr, size);
5514 } else {
5515 ElfW(Sym) *esym;
5516 /* put a common area */
5517 put_extern_sym(sym, NULL, align, size);
5518 /* XXX: find a nicer way */
5519 esym = &((ElfW(Sym) *)symtab_section->data)[sym->c];
5520 esym->st_shndx = SHN_COMMON;
5521 }
5522 } else {
5523 CValue cval;
5524
5525 /* push global reference */
5526 sym = get_sym_ref(type, sec, addr, size);
5527 cval.ul = 0;
5528 vsetc(type, VT_CONST | VT_SYM, &cval);
5529 vtop->sym = sym;
5530 }
5531 /* patch symbol weakness */
5532 if (type->t & VT_WEAK)
5533 weaken_symbol(sym);
5534 #ifdef CONFIG_TCC_BCHECK
5535 /* handles bounds now because the symbol must be defined
5536 before for the relocation */
5537 if (tcc_state->do_bounds_check) {
5538 unsigned long *bounds_ptr;
5539
5540 greloc(bounds_section, sym, bounds_section->data_offset, R_DATA_PTR);
5541 /* then add global bound info */
5542 bounds_ptr = section_ptr_add(bounds_section, 2 * sizeof(long));
5543 bounds_ptr[0] = 0; /* relocated */
5544 bounds_ptr[1] = size;
5545 }
5546 #endif
5547 }
5548 if (has_init || (type->t & VT_VLA)) {
5549 decl_initializer(type, sec, addr, 1, 0);
5550 /* restore parse state if needed */
5551 if (init_str.str) {
5552 tok_str_free(init_str.str);
5553 restore_parse_state(&saved_parse_state);
5554 }
5555 /* patch flexible array member size back to -1, */
5556 /* for possible subsequent similar declarations */
5557 if (flexible_array)
5558 flexible_array->type.ref->c = -1;
5559 }
5560 no_alloc: ;
5561 }
5562
5563 static void put_func_debug(Sym *sym)
5564 {
5565 char buf[512];
5566
5567 /* stabs info */
5568 /* XXX: we put here a dummy type */
5569 snprintf(buf, sizeof(buf), "%s:%c1",
5570 funcname, sym->type.t & VT_STATIC ? 'f' : 'F');
5571 put_stabs_r(buf, N_FUN, 0, file->line_num, 0,
5572 cur_text_section, sym->c);
5573 /* //gr gdb wants a line at the function */
5574 put_stabn(N_SLINE, 0, file->line_num, 0);
5575 last_ind = 0;
5576 last_line_num = 0;
5577 }
5578
5579 /* parse an old style function declaration list */
5580 /* XXX: check multiple parameter */
5581 static void func_decl_list(Sym *func_sym)
5582 {
5583 AttributeDef ad;
5584 int v;
5585 Sym *s;
5586 CType btype, type;
5587
5588 /* parse each declaration */
5589 while (tok != '{' && tok != ';' && tok != ',' && tok != TOK_EOF &&
5590 tok != TOK_ASM1 && tok != TOK_ASM2 && tok != TOK_ASM3) {
5591 if (!parse_btype(&btype, &ad))
5592 expect("declaration list");
5593 if (((btype.t & VT_BTYPE) == VT_ENUM ||
5594 (btype.t & VT_BTYPE) == VT_STRUCT) &&
5595 tok == ';') {
5596 /* we accept no variable after */
5597 } else {
5598 for(;;) {
5599 type = btype;
5600 type_decl(&type, &ad, &v, TYPE_DIRECT);
5601 /* find parameter in function parameter list */
5602 s = func_sym->next;
5603 while (s != NULL) {
5604 if ((s->v & ~SYM_FIELD) == v)
5605 goto found;
5606 s = s->next;
5607 }
5608 tcc_error("declaration for parameter '%s' but no such parameter",
5609 get_tok_str(v, NULL));
5610 found:
5611 /* check that no storage specifier except 'register' was given */
5612 if (type.t & VT_STORAGE)
5613 tcc_error("storage class specified for '%s'", get_tok_str(v, NULL));
5614 convert_parameter_type(&type);
5615 /* we can add the type (NOTE: it could be local to the function) */
5616 s->type = type;
5617 /* accept other parameters */
5618 if (tok == ',')
5619 next();
5620 else
5621 break;
5622 }
5623 }
5624 skip(';');
5625 }
5626 }
5627
5628 /* parse a function defined by symbol 'sym' and generate its code in
5629 'cur_text_section' */
5630 static void gen_function(Sym *sym)
5631 {
5632 int saved_nocode_wanted = nocode_wanted;
5633 nocode_wanted = 0;
5634 ind = cur_text_section->data_offset;
5635 /* NOTE: we patch the symbol size later */
5636 put_extern_sym(sym, cur_text_section, ind, 0);
5637 funcname = get_tok_str(sym->v, NULL);
5638 func_ind = ind;
5639 /* Initialize VLA state */
5640 vla_sp_loc = &vla_sp_root_loc;
5641 vla_flags = VLA_NEED_NEW_FRAME;
5642 /* put debug symbol */
5643 if (tcc_state->do_debug)
5644 put_func_debug(sym);
5645 /* push a dummy symbol to enable local sym storage */
5646 sym_push2(&local_stack, SYM_FIELD, 0, 0);
5647 gfunc_prolog(&sym->type);
5648 rsym = 0;
5649 block(NULL, NULL, NULL, NULL, 0, 0);
5650 gsym(rsym);
5651 gfunc_epilog();
5652 cur_text_section->data_offset = ind;
5653 label_pop(&global_label_stack, NULL);
5654 /* reset local stack */
5655 scope_stack_bottom = NULL;
5656 sym_pop(&local_stack, NULL);
5657 /* end of function */
5658 /* patch symbol size */
5659 ((ElfW(Sym) *)symtab_section->data)[sym->c].st_size =
5660 ind - func_ind;
5661 /* patch symbol weakness (this definition overrules any prototype) */
5662 if (sym->type.t & VT_WEAK)
5663 weaken_symbol(sym);
5664 if (tcc_state->do_debug) {
5665 put_stabn(N_FUN, 0, 0, ind - func_ind);
5666 }
5667 /* It's better to crash than to generate wrong code */
5668 cur_text_section = NULL;
5669 funcname = ""; /* for safety */
5670 func_vt.t = VT_VOID; /* for safety */
5671 ind = 0; /* for safety */
5672 nocode_wanted = saved_nocode_wanted;
5673 }
5674
5675 ST_FUNC void gen_inline_functions(void)
5676 {
5677 Sym *sym;
5678 int *str, inline_generated, i;
5679 struct InlineFunc *fn;
5680
5681 /* iterate while inline function are referenced */
5682 for(;;) {
5683 inline_generated = 0;
5684 for (i = 0; i < tcc_state->nb_inline_fns; ++i) {
5685 fn = tcc_state->inline_fns[i];
5686 sym = fn->sym;
5687 if (sym && sym->c) {
5688 /* the function was used: generate its code and
5689 convert it to a normal function */
5690 str = fn->token_str;
5691 fn->sym = NULL;
5692 if (file)
5693 pstrcpy(file->filename, sizeof file->filename, fn->filename);
5694 sym->r = VT_SYM | VT_CONST;
5695 sym->type.t &= ~VT_INLINE;
5696
5697 macro_ptr = str;
5698 next();
5699 cur_text_section = text_section;
5700 gen_function(sym);
5701 macro_ptr = NULL; /* fail safe */
5702
5703 inline_generated = 1;
5704 }
5705 }
5706 if (!inline_generated)
5707 break;
5708 }
5709 for (i = 0; i < tcc_state->nb_inline_fns; ++i) {
5710 fn = tcc_state->inline_fns[i];
5711 str = fn->token_str;
5712 tok_str_free(str);
5713 }
5714 dynarray_reset(&tcc_state->inline_fns, &tcc_state->nb_inline_fns);
5715 }
5716
5717 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
5718 static int decl0(int l, int is_for_loop_init)
5719 {
5720 int v, has_init, r;
5721 CType type, btype;
5722 Sym *sym;
5723 AttributeDef ad;
5724
5725 while (1) {
5726 if (!parse_btype(&btype, &ad)) {
5727 if (is_for_loop_init)
5728 return 0;
5729 /* skip redundant ';' */
5730 /* XXX: find more elegant solution */
5731 if (tok == ';') {
5732 next();
5733 continue;
5734 }
5735 if (l == VT_CONST &&
5736 (tok == TOK_ASM1 || tok == TOK_ASM2 || tok == TOK_ASM3)) {
5737 /* global asm block */
5738 asm_global_instr();
5739 continue;
5740 }
5741 /* special test for old K&R protos without explicit int
5742 type. Only accepted when defining global data */
5743 if (l == VT_LOCAL || tok < TOK_DEFINE)
5744 break;
5745 btype.t = VT_INT;
5746 }
5747 if (((btype.t & VT_BTYPE) == VT_ENUM ||
5748 (btype.t & VT_BTYPE) == VT_STRUCT) &&
5749 tok == ';') {
5750 /* we accept no variable after */
5751 next();
5752 continue;
5753 }
5754 while (1) { /* iterate thru each declaration */
5755 char *asm_label; // associated asm label
5756 type = btype;
5757 type_decl(&type, &ad, &v, TYPE_DIRECT);
5758 #if 0
5759 {
5760 char buf[500];
5761 type_to_str(buf, sizeof(buf), t, get_tok_str(v, NULL));
5762 printf("type = '%s'\n", buf);
5763 }
5764 #endif
5765 if ((type.t & VT_BTYPE) == VT_FUNC) {
5766 if ((type.t & VT_STATIC) && (l == VT_LOCAL)) {
5767 tcc_error("function without file scope cannot be static");
5768 }
5769 /* if old style function prototype, we accept a
5770 declaration list */
5771 sym = type.ref;
5772 if (sym->c == FUNC_OLD)
5773 func_decl_list(sym);
5774 }
5775
5776 asm_label = NULL;
5777 if (gnu_ext && (tok == TOK_ASM1 || tok == TOK_ASM2 || tok == TOK_ASM3)) {
5778 CString astr;
5779
5780 asm_label_instr(&astr);
5781 asm_label = tcc_strdup(astr.data);
5782 cstr_free(&astr);
5783
5784 /* parse one last attribute list, after asm label */
5785 parse_attribute(&ad);
5786 }
5787
5788 if (ad.weak)
5789 type.t |= VT_WEAK;
5790 #ifdef TCC_TARGET_PE
5791 if (ad.func_import)
5792 type.t |= VT_IMPORT;
5793 if (ad.func_export)
5794 type.t |= VT_EXPORT;
5795 #endif
5796 if (tok == '{') {
5797 if (l == VT_LOCAL)
5798 tcc_error("cannot use local functions");
5799 if ((type.t & VT_BTYPE) != VT_FUNC)
5800 expect("function definition");
5801
5802 /* reject abstract declarators in function definition */
5803 sym = type.ref;
5804 while ((sym = sym->next) != NULL)
5805 if (!(sym->v & ~SYM_FIELD))
5806 expect("identifier");
5807
5808 /* XXX: cannot do better now: convert extern line to static inline */
5809 if ((type.t & (VT_EXTERN | VT_INLINE)) == (VT_EXTERN | VT_INLINE))
5810 type.t = (type.t & ~VT_EXTERN) | VT_STATIC;
5811
5812 sym = sym_find(v);
5813 if (sym) {
5814 if ((sym->type.t & VT_BTYPE) != VT_FUNC)
5815 goto func_error1;
5816
5817 r = sym->type.ref->r;
5818 /* use func_call from prototype if not defined */
5819 if (FUNC_CALL(r) != FUNC_CDECL
5820 && FUNC_CALL(type.ref->r) == FUNC_CDECL)
5821 FUNC_CALL(type.ref->r) = FUNC_CALL(r);
5822
5823 /* use export from prototype */
5824 if (FUNC_EXPORT(r))
5825 FUNC_EXPORT(type.ref->r) = 1;
5826
5827 /* use static from prototype */
5828 if (sym->type.t & VT_STATIC)
5829 type.t = (type.t & ~VT_EXTERN) | VT_STATIC;
5830
5831 if (!is_compatible_types(&sym->type, &type)) {
5832 func_error1:
5833 tcc_error("incompatible types for redefinition of '%s'",
5834 get_tok_str(v, NULL));
5835 }
5836 /* if symbol is already defined, then put complete type */
5837 sym->type = type;
5838 } else {
5839 /* put function symbol */
5840 sym = global_identifier_push(v, type.t, 0);
5841 sym->type.ref = type.ref;
5842 }
5843
5844 /* static inline functions are just recorded as a kind
5845 of macro. Their code will be emitted at the end of
5846 the compilation unit only if they are used */
5847 if ((type.t & (VT_INLINE | VT_STATIC)) ==
5848 (VT_INLINE | VT_STATIC)) {
5849 TokenString func_str;
5850 int block_level;
5851 struct InlineFunc *fn;
5852 const char *filename;
5853
5854 tok_str_new(&func_str);
5855
5856 block_level = 0;
5857 for(;;) {
5858 int t;
5859 if (tok == TOK_EOF)
5860 tcc_error("unexpected end of file");
5861 tok_str_add_tok(&func_str);
5862 t = tok;
5863 next();
5864 if (t == '{') {
5865 block_level++;
5866 } else if (t == '}') {
5867 block_level--;
5868 if (block_level == 0)
5869 break;
5870 }
5871 }
5872 tok_str_add(&func_str, -1);
5873 tok_str_add(&func_str, 0);
5874 filename = file ? file->filename : "";
5875 fn = tcc_malloc(sizeof *fn + strlen(filename));
5876 strcpy(fn->filename, filename);
5877 fn->sym = sym;
5878 fn->token_str = func_str.str;
5879 dynarray_add((void ***)&tcc_state->inline_fns, &tcc_state->nb_inline_fns, fn);
5880
5881 } else {
5882 /* compute text section */
5883 cur_text_section = ad.section;
5884 if (!cur_text_section)
5885 cur_text_section = text_section;
5886 sym->r = VT_SYM | VT_CONST;
5887 gen_function(sym);
5888 }
5889 break;
5890 } else {
5891 if (btype.t & VT_TYPEDEF) {
5892 /* save typedefed type */
5893 /* XXX: test storage specifiers ? */
5894 sym = sym_push(v, &type, INT_ATTR(&ad), 0);
5895 sym->type.t |= VT_TYPEDEF;
5896 } else {
5897 r = 0;
5898 if ((type.t & VT_BTYPE) == VT_FUNC) {
5899 /* external function definition */
5900 /* specific case for func_call attribute */
5901 type.ref->r = INT_ATTR(&ad);
5902 } else if (!(type.t & VT_ARRAY)) {
5903 /* not lvalue if array */
5904 r |= lvalue_type(type.t);
5905 }
5906 has_init = (tok == '=');
5907 if (has_init && (type.t & VT_VLA))
5908 tcc_error("Variable length array cannot be initialized");
5909 if ((btype.t & VT_EXTERN) || ((type.t & VT_BTYPE) == VT_FUNC) ||
5910 ((type.t & VT_ARRAY) && (type.t & VT_STATIC) &&
5911 !has_init && l == VT_CONST && type.ref->c < 0)) {
5912 /* external variable or function */
5913 /* NOTE: as GCC, uninitialized global static
5914 arrays of null size are considered as
5915 extern */
5916 sym = external_sym(v, &type, r, asm_label);
5917
5918 if (type.t & VT_WEAK)
5919 weaken_symbol(sym);
5920
5921 if (ad.alias_target) {
5922 Section tsec;
5923 Elf32_Sym *esym;
5924 Sym *alias_target;
5925
5926 alias_target = sym_find(ad.alias_target);
5927 if (!alias_target || !alias_target->c)
5928 tcc_error("unsupported forward __alias__ attribute");
5929 esym = &((Elf32_Sym *)symtab_section->data)[alias_target->c];
5930 tsec.sh_num = esym->st_shndx;
5931 put_extern_sym2(sym, &tsec, esym->st_value, esym->st_size, 0);
5932 }
5933 } else {
5934 type.t |= (btype.t & VT_STATIC); /* Retain "static". */
5935 if (type.t & VT_STATIC)
5936 r |= VT_CONST;
5937 else
5938 r |= l;
5939 if (has_init)
5940 next();
5941 decl_initializer_alloc(&type, &ad, r, has_init, v, asm_label, l);
5942 }
5943 }
5944 if (tok != ',') {
5945 if (is_for_loop_init)
5946 return 1;
5947 skip(';');
5948 break;
5949 }
5950 next();
5951 }
5952 ad.aligned = 0;
5953 }
5954 }
5955 return 0;
5956 }
5957
5958 ST_FUNC void decl(int l)
5959 {
5960 decl0(l, 0);
5961 }
Tiny C Compiler main repository