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tccgen: fix crash with undeclared struct
[tinycc.git] / tccgen.c
blob4849b6c0c4d2216415862ce04e1a178259690316
1 /*
2 * TCC - Tiny C Compiler
3 *
4 * Copyright (c) 2001-2004 Fabrice Bellard
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #include "tcc.h"
22
23 /********************************************************/
24 /* global variables */
25
26 /* loc : local variable index
27 ind : output code index
28 rsym: return symbol
29 anon_sym: anonymous symbol index
30 */
31 ST_DATA int rsym, anon_sym, ind, loc;
32
33 ST_DATA Section *text_section, *data_section, *bss_section; /* predefined sections */
34 ST_DATA Section *cur_text_section; /* current section where function code is generated */
35 #ifdef CONFIG_TCC_ASM
36 ST_DATA Section *last_text_section; /* to handle .previous asm directive */
37 #endif
38 #ifdef CONFIG_TCC_BCHECK
39 /* bound check related sections */
40 ST_DATA Section *bounds_section; /* contains global data bound description */
41 ST_DATA Section *lbounds_section; /* contains local data bound description */
42 #endif
43 /* symbol sections */
44 ST_DATA Section *symtab_section, *strtab_section;
45 /* debug sections */
46 ST_DATA Section *stab_section, *stabstr_section;
47 ST_DATA Sym *sym_free_first;
48 ST_DATA void **sym_pools;
49 ST_DATA int nb_sym_pools;
50
51 ST_DATA Sym *global_stack;
52 ST_DATA Sym *local_stack;
53 ST_DATA Sym *scope_stack_bottom;
54 ST_DATA Sym *define_stack;
55 ST_DATA Sym *global_label_stack;
56 ST_DATA Sym *local_label_stack;
57
58 ST_DATA int vla_sp_loc_tmp; /* vla_sp_loc is set to this when the value won't be needed later */
59 ST_DATA int vla_sp_root_loc; /* vla_sp_loc for SP before any VLAs were pushed */
60 ST_DATA int *vla_sp_loc; /* Pointer to variable holding location to store stack pointer on the stack when modifying stack pointer */
61 ST_DATA int vla_flags; /* VLA_* flags */
62
63 ST_DATA SValue __vstack[1+VSTACK_SIZE], *vtop;
64
65 ST_DATA int const_wanted; /* true if constant wanted */
66 ST_DATA int nocode_wanted; /* true if no code generation wanted for an expression */
67 ST_DATA int global_expr; /* true if compound literals must be allocated globally (used during initializers parsing */
68 ST_DATA CType func_vt; /* current function return type (used by return instruction) */
69 ST_DATA int func_vc;
70 ST_DATA int last_line_num, last_ind, func_ind; /* debug last line number and pc */
71 ST_DATA char *funcname;
72
73 ST_DATA CType char_pointer_type, func_old_type, int_type, size_type;
74
75 /* ------------------------------------------------------------------------- */
76 static void gen_cast(CType *type);
77 static inline CType *pointed_type(CType *type);
78 static int is_compatible_types(CType *type1, CType *type2);
79 static int parse_btype(CType *type, AttributeDef *ad);
80 static void type_decl(CType *type, AttributeDef *ad, int *v, int td);
81 static void parse_expr_type(CType *type);
82 static void decl_initializer(CType *type, Section *sec, unsigned long c, int first, int size_only);
83 static void block(int *bsym, int *csym, int *case_sym, int *def_sym, int case_reg, int is_expr);
84 static void decl_initializer_alloc(CType *type, AttributeDef *ad, int r, int has_init, int v, char *asm_label, int scope);
85 static int decl0(int l, int is_for_loop_init);
86 static void expr_eq(void);
87 static void unary_type(CType *type);
88 static void vla_runtime_type_size(CType *type, int *a);
89 static void vla_sp_save(void);
90 static int is_compatible_parameter_types(CType *type1, CType *type2);
91 static void expr_type(CType *type);
92
93 ST_INLN int is_float(int t)
94 {
95 int bt;
96 bt = t & VT_BTYPE;
97 return bt == VT_LDOUBLE || bt == VT_DOUBLE || bt == VT_FLOAT || bt == VT_QFLOAT;
98 }
99
100 /* we use our own 'finite' function to avoid potential problems with
101 non standard math libs */
102 /* XXX: endianness dependent */
103 ST_FUNC int ieee_finite(double d)
104 {
105 int *p = (int *)&d;
106 return ((unsigned)((p[1] | 0x800fffff) + 1)) >> 31;
107 }
108
109 ST_FUNC void test_lvalue(void)
110 {
111 if (!(vtop->r & VT_LVAL))
112 expect("lvalue");
113 }
114
115 /* ------------------------------------------------------------------------- */
116 /* symbol allocator */
117 static Sym *__sym_malloc(void)
118 {
119 Sym *sym_pool, *sym, *last_sym;
120 int i;
121
122 sym_pool = tcc_malloc(SYM_POOL_NB * sizeof(Sym));
123 dynarray_add(&sym_pools, &nb_sym_pools, sym_pool);
124
125 last_sym = sym_free_first;
126 sym = sym_pool;
127 for(i = 0; i < SYM_POOL_NB; i++) {
128 sym->next = last_sym;
129 last_sym = sym;
130 sym++;
131 }
132 sym_free_first = last_sym;
133 return last_sym;
134 }
135
136 static inline Sym *sym_malloc(void)
137 {
138 Sym *sym;
139 sym = sym_free_first;
140 if (!sym)
141 sym = __sym_malloc();
142 sym_free_first = sym->next;
143 return sym;
144 }
145
146 ST_INLN void sym_free(Sym *sym)
147 {
148 sym->next = sym_free_first;
149 tcc_free(sym->asm_label);
150 sym_free_first = sym;
151 }
152
153 /* push, without hashing */
154 ST_FUNC Sym *sym_push2(Sym **ps, int v, int t, long c)
155 {
156 Sym *s;
157 if (ps == &local_stack) {
158 for (s = *ps; s && s != scope_stack_bottom; s = s->prev)
159 if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM && s->v == v)
160 tcc_error("incompatible types for redefinition of '%s'",
161 get_tok_str(v, NULL));
162 }
163 s = *ps;
164 s = sym_malloc();
165 s->asm_label = NULL;
166 s->v = v;
167 s->type.t = t;
168 s->type.ref = NULL;
169 #ifdef _WIN64
170 s->d = NULL;
171 #endif
172 s->c = c;
173 s->next = NULL;
174 /* add in stack */
175 s->prev = *ps;
176 *ps = s;
177 return s;
178 }
179
180 /* find a symbol and return its associated structure. 's' is the top
181 of the symbol stack */
182 ST_FUNC Sym *sym_find2(Sym *s, int v)
183 {
184 while (s) {
185 if (s->v == v)
186 return s;
187 s = s->prev;
188 }
189 return NULL;
190 }
191
192 /* structure lookup */
193 ST_INLN Sym *struct_find(int v)
194 {
195 v -= TOK_IDENT;
196 if ((unsigned)v >= (unsigned)(tok_ident - TOK_IDENT))
197 return NULL;
198 return table_ident[v]->sym_struct;
199 }
200
201 /* find an identifier */
202 ST_INLN Sym *sym_find(int v)
203 {
204 v -= TOK_IDENT;
205 if ((unsigned)v >= (unsigned)(tok_ident - TOK_IDENT))
206 return NULL;
207 return table_ident[v]->sym_identifier;
208 }
209
210 /* push a given symbol on the symbol stack */
211 ST_FUNC Sym *sym_push(int v, CType *type, int r, int c)
212 {
213 Sym *s, **ps;
214 TokenSym *ts;
215
216 if (local_stack)
217 ps = &local_stack;
218 else
219 ps = &global_stack;
220 s = sym_push2(ps, v, type->t, c);
221 s->type.ref = type->ref;
222 s->r = r;
223 /* don't record fields or anonymous symbols */
224 /* XXX: simplify */
225 if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM) {
226 /* record symbol in token array */
227 ts = table_ident[(v & ~SYM_STRUCT) - TOK_IDENT];
228 if (v & SYM_STRUCT)
229 ps = &ts->sym_struct;
230 else
231 ps = &ts->sym_identifier;
232 s->prev_tok = *ps;
233 *ps = s;
234 }
235 return s;
236 }
237
238 /* push a global identifier */
239 ST_FUNC Sym *global_identifier_push(int v, int t, int c)
240 {
241 Sym *s, **ps;
242 s = sym_push2(&global_stack, v, t, c);
243 /* don't record anonymous symbol */
244 if (v < SYM_FIRST_ANOM) {
245 ps = &table_ident[v - TOK_IDENT]->sym_identifier;
246 /* modify the top most local identifier, so that
247 sym_identifier will point to 's' when popped */
248 while (*ps != NULL)
249 ps = &(*ps)->prev_tok;
250 s->prev_tok = NULL;
251 *ps = s;
252 }
253 return s;
254 }
255
256 /* pop symbols until top reaches 'b' */
257 ST_FUNC void sym_pop(Sym **ptop, Sym *b)
258 {
259 Sym *s, *ss, **ps;
260 TokenSym *ts;
261 int v;
262
263 s = *ptop;
264 while(s != b) {
265 ss = s->prev;
266 v = s->v;
267 /* remove symbol in token array */
268 /* XXX: simplify */
269 if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM) {
270 ts = table_ident[(v & ~SYM_STRUCT) - TOK_IDENT];
271 if (v & SYM_STRUCT)
272 ps = &ts->sym_struct;
273 else
274 ps = &ts->sym_identifier;
275 *ps = s->prev_tok;
276 }
277 sym_free(s);
278 s = ss;
279 }
280 *ptop = b;
281 }
282
283 static void weaken_symbol(Sym *sym)
284 {
285 sym->type.t |= VT_WEAK;
286 if (sym->c > 0) {
287 int esym_type;
288 ElfW(Sym) *esym;
289
290 esym = &((ElfW(Sym) *)symtab_section->data)[sym->c];
291 esym_type = ELFW(ST_TYPE)(esym->st_info);
292 esym->st_info = ELFW(ST_INFO)(STB_WEAK, esym_type);
293 }
294 }
295
296 /* ------------------------------------------------------------------------- */
297
298 ST_FUNC void swap(int *p, int *q)
299 {
300 int t;
301 t = *p;
302 *p = *q;
303 *q = t;
304 }
305
306 static void vsetc(CType *type, int r, CValue *vc)
307 {
308 int v;
309
310 if (vtop >= vstack + (VSTACK_SIZE - 1))
311 tcc_error("memory full");
312 /* cannot let cpu flags if other instruction are generated. Also
313 avoid leaving VT_JMP anywhere except on the top of the stack
314 because it would complicate the code generator. */
315 if (vtop >= vstack) {
316 v = vtop->r & VT_VALMASK;
317 if (v == VT_CMP || (v & ~1) == VT_JMP)
318 gv(RC_INT);
319 }
320 vtop++;
321 vtop->type = *type;
322 vtop->r = r;
323 vtop->r2 = VT_CONST;
324 vtop->c = *vc;
325 }
326
327 /* push constant of type "type" with useless value */
328 void vpush(CType *type)
329 {
330 CValue cval;
331 vsetc(type, VT_CONST, &cval);
332 }
333
334 /* push integer constant */
335 ST_FUNC void vpushi(int v)
336 {
337 CValue cval;
338 cval.i = v;
339 vsetc(&int_type, VT_CONST, &cval);
340 }
341
342 /* push a pointer sized constant */
343 static void vpushs(long long v)
344 {
345 CValue cval;
346 if (PTR_SIZE == 4)
347 cval.i = (int)v;
348 else
349 cval.ull = v;
350 vsetc(&size_type, VT_CONST, &cval);
351 }
352
353 /* push arbitrary 64bit constant */
354 void vpush64(int ty, unsigned long long v)
355 {
356 CValue cval;
357 CType ctype;
358 ctype.t = ty;
359 ctype.ref = NULL;
360 cval.ull = v;
361 vsetc(&ctype, VT_CONST, &cval);
362 }
363
364 /* push long long constant */
365 static inline void vpushll(long long v)
366 {
367 vpush64(VT_LLONG, v);
368 }
369
370 /* Return a static symbol pointing to a section */
371 ST_FUNC Sym *get_sym_ref(CType *type, Section *sec, unsigned long offset, unsigned long size)
372 {
373 int v;
374 Sym *sym;
375
376 v = anon_sym++;
377 sym = global_identifier_push(v, type->t | VT_STATIC, 0);
378 sym->type.ref = type->ref;
379 sym->r = VT_CONST | VT_SYM;
380 put_extern_sym(sym, sec, offset, size);
381 return sym;
382 }
383
384 /* push a reference to a section offset by adding a dummy symbol */
385 static void vpush_ref(CType *type, Section *sec, unsigned long offset, unsigned long size)
386 {
387 CValue cval;
388
389 cval.ul = 0;
390 vsetc(type, VT_CONST | VT_SYM, &cval);
391 vtop->sym = get_sym_ref(type, sec, offset, size);
392 }
393
394 /* define a new external reference to a symbol 'v' of type 'u' */
395 ST_FUNC Sym *external_global_sym(int v, CType *type, int r)
396 {
397 Sym *s;
398
399 s = sym_find(v);
400 if (!s) {
401 /* push forward reference */
402 s = global_identifier_push(v, type->t | VT_EXTERN, 0);
403 s->type.ref = type->ref;
404 s->r = r | VT_CONST | VT_SYM;
405 }
406 return s;
407 }
408
409 /* define a new external reference to a symbol 'v' with alternate asm
410 name 'asm_label' of type 'u'. 'asm_label' is equal to NULL if there
411 is no alternate name (most cases) */
412 static Sym *external_sym(int v, CType *type, int r, char *asm_label)
413 {
414 Sym *s;
415
416 s = sym_find(v);
417 if (!s) {
418 /* push forward reference */
419 s = sym_push(v, type, r | VT_CONST | VT_SYM, 0);
420 s->asm_label = asm_label;
421 s->type.t |= VT_EXTERN;
422 } else if (s->type.ref == func_old_type.ref) {
423 s->type.ref = type->ref;
424 s->r = r | VT_CONST | VT_SYM;
425 s->type.t |= VT_EXTERN;
426 } else if (!is_compatible_types(&s->type, type)) {
427 tcc_error("incompatible types for redefinition of '%s'",
428 get_tok_str(v, NULL));
429 }
430 return s;
431 }
432
433 /* push a reference to global symbol v */
434 ST_FUNC void vpush_global_sym(CType *type, int v)
435 {
436 Sym *sym;
437 CValue cval;
438
439 sym = external_global_sym(v, type, 0);
440 cval.ul = 0;
441 vsetc(type, VT_CONST | VT_SYM, &cval);
442 vtop->sym = sym;
443 }
444
445 ST_FUNC void vset(CType *type, int r, int v)
446 {
447 CValue cval;
448
449 cval.i = v;
450 vsetc(type, r, &cval);
451 }
452
453 static void vseti(int r, int v)
454 {
455 CType type;
456 type.t = VT_INT;
457 type.ref = 0;
458 vset(&type, r, v);
459 }
460
461 ST_FUNC void vswap(void)
462 {
463 SValue tmp;
464 /* cannot let cpu flags if other instruction are generated. Also
465 avoid leaving VT_JMP anywhere except on the top of the stack
466 because it would complicate the code generator. */
467 if (vtop >= vstack) {
468 int v = vtop->r & VT_VALMASK;
469 if (v == VT_CMP || (v & ~1) == VT_JMP)
470 gv(RC_INT);
471 }
472 tmp = vtop[0];
473 vtop[0] = vtop[-1];
474 vtop[-1] = tmp;
475
476 /* XXX: +2% overall speed possible with optimized memswap
477 *
478 * memswap(&vtop[0], &vtop[1], sizeof *vtop);
479 */
480 }
481
482 ST_FUNC void vpushv(SValue *v)
483 {
484 if (vtop >= vstack + (VSTACK_SIZE - 1))
485 tcc_error("memory full");
486 vtop++;
487 *vtop = *v;
488 }
489
490 static void vdup(void)
491 {
492 vpushv(vtop);
493 }
494
495 /* save r to the memory stack, and mark it as being free */
496 ST_FUNC void save_reg(int r)
497 {
498 int l, saved, size, align;
499 SValue *p, sv;
500 CType *type;
501
502 /* modify all stack values */
503 saved = 0;
504 l = 0;
505 for(p=vstack;p<=vtop;p++) {
506 if ((p->r & VT_VALMASK) == r ||
507 ((p->type.t & VT_BTYPE) == VT_LLONG && (p->r2 & VT_VALMASK) == r)) {
508 /* must save value on stack if not already done */
509 if (!saved) {
510 /* NOTE: must reload 'r' because r might be equal to r2 */
511 r = p->r & VT_VALMASK;
512 /* store register in the stack */
513 type = &p->type;
514 if ((p->r & VT_LVAL) ||
515 (!is_float(type->t) && (type->t & VT_BTYPE) != VT_LLONG))
516 #ifdef TCC_TARGET_X86_64
517 type = &char_pointer_type;
518 #else
519 type = &int_type;
520 #endif
521 size = type_size(type, &align);
522 loc = (loc - size) & -align;
523 sv.type.t = type->t;
524 sv.r = VT_LOCAL | VT_LVAL;
525 sv.c.ul = loc;
526 store(r, &sv);
527 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
528 /* x86 specific: need to pop fp register ST0 if saved */
529 if (r == TREG_ST0) {
530 o(0xd8dd); /* fstp %st(0) */
531 }
532 #endif
533 #ifndef TCC_TARGET_X86_64
534 /* special long long case */
535 if ((type->t & VT_BTYPE) == VT_LLONG) {
536 sv.c.ul += 4;
537 store(p->r2, &sv);
538 }
539 #endif
540 l = loc;
541 saved = 1;
542 }
543 /* mark that stack entry as being saved on the stack */
544 if (p->r & VT_LVAL) {
545 /* also clear the bounded flag because the
546 relocation address of the function was stored in
547 p->c.ul */
548 p->r = (p->r & ~(VT_VALMASK | VT_BOUNDED)) | VT_LLOCAL;
549 } else {
550 p->r = lvalue_type(p->type.t) | VT_LOCAL;
551 }
552 p->r2 = VT_CONST;
553 p->c.ul = l;
554 }
555 }
556 }
557
558 #ifdef TCC_TARGET_ARM
559 /* find a register of class 'rc2' with at most one reference on stack.
560 * If none, call get_reg(rc) */
561 ST_FUNC int get_reg_ex(int rc, int rc2)
562 {
563 int r;
564 SValue *p;
565
566 for(r=0;r<NB_REGS;r++) {
567 if (reg_classes[r] & rc2) {
568 int n;
569 n=0;
570 for(p = vstack; p <= vtop; p++) {
571 if ((p->r & VT_VALMASK) == r ||
572 (p->r2 & VT_VALMASK) == r)
573 n++;
574 }
575 if (n <= 1)
576 return r;
577 }
578 }
579 return get_reg(rc);
580 }
581 #endif
582
583 /* find a free register of class 'rc'. If none, save one register */
584 ST_FUNC int get_reg(int rc)
585 {
586 int r;
587 SValue *p;
588
589 /* find a free register */
590 for(r=0;r<NB_REGS;r++) {
591 if (reg_classes[r] & rc) {
592 for(p=vstack;p<=vtop;p++) {
593 if ((p->r & VT_VALMASK) == r ||
594 (p->r2 & VT_VALMASK) == r)
595 goto notfound;
596 }
597 return r;
598 }
599 notfound: ;
600 }
601
602 /* no register left : free the first one on the stack (VERY
603 IMPORTANT to start from the bottom to ensure that we don't
604 spill registers used in gen_opi()) */
605 for(p=vstack;p<=vtop;p++) {
606 /* look at second register (if long long) */
607 r = p->r2 & VT_VALMASK;
608 if (r < VT_CONST && (reg_classes[r] & rc))
609 goto save_found;
610 r = p->r & VT_VALMASK;
611 if (r < VT_CONST && (reg_classes[r] & rc)) {
612 save_found:
613 save_reg(r);
614 return r;
615 }
616 }
617 /* Should never comes here */
618 return -1;
619 }
620
621 /* save registers up to (vtop - n) stack entry */
622 ST_FUNC void save_regs(int n)
623 {
624 int r;
625 SValue *p, *p1;
626 p1 = vtop - n;
627 for(p = vstack;p <= p1; p++) {
628 r = p->r & VT_VALMASK;
629 if (r < VT_CONST) {
630 save_reg(r);
631 }
632 }
633 }
634
635 /* move register 's' (of type 't') to 'r', and flush previous value of r to memory
636 if needed */
637 static void move_reg(int r, int s, int t)
638 {
639 SValue sv;
640
641 if (r != s) {
642 save_reg(r);
643 sv.type.t = t;
644 sv.type.ref = NULL;
645 sv.r = s;
646 sv.c.ul = 0;
647 load(r, &sv);
648 }
649 }
650
651 /* get address of vtop (vtop MUST BE an lvalue) */
652 static void gaddrof(void)
653 {
654 if (vtop->r & VT_REF)
655 gv(RC_INT);
656 vtop->r &= ~VT_LVAL;
657 /* tricky: if saved lvalue, then we can go back to lvalue */
658 if ((vtop->r & VT_VALMASK) == VT_LLOCAL)
659 vtop->r = (vtop->r & ~(VT_VALMASK | VT_LVAL_TYPE)) | VT_LOCAL | VT_LVAL;
660
661
662 }
663
664 #ifdef CONFIG_TCC_BCHECK
665 /* generate lvalue bound code */
666 static void gbound(void)
667 {
668 int lval_type;
669 CType type1;
670
671 vtop->r &= ~VT_MUSTBOUND;
672 /* if lvalue, then use checking code before dereferencing */
673 if (vtop->r & VT_LVAL) {
674 /* if not VT_BOUNDED value, then make one */
675 if (!(vtop->r & VT_BOUNDED)) {
676 lval_type = vtop->r & (VT_LVAL_TYPE | VT_LVAL);
677 /* must save type because we must set it to int to get pointer */
678 type1 = vtop->type;
679 vtop->type.t = VT_INT;
680 gaddrof();
681 vpushi(0);
682 gen_bounded_ptr_add();
683 vtop->r |= lval_type;
684 vtop->type = type1;
685 }
686 /* then check for dereferencing */
687 gen_bounded_ptr_deref();
688 }
689 }
690 #endif
691
692 /* store vtop a register belonging to class 'rc'. lvalues are
693 converted to values. Cannot be used if cannot be converted to
694 register value (such as structures). */
695 ST_FUNC int gv(int rc)
696 {
697 int r, bit_pos, bit_size, size, align, i;
698 int rc2;
699
700 /* NOTE: get_reg can modify vstack[] */
701 if (vtop->type.t & VT_BITFIELD) {
702 CType type;
703 int bits = 32;
704 bit_pos = (vtop->type.t >> VT_STRUCT_SHIFT) & 0x3f;
705 bit_size = (vtop->type.t >> (VT_STRUCT_SHIFT + 6)) & 0x3f;
706 /* remove bit field info to avoid loops */
707 vtop->type.t &= ~(VT_BITFIELD | (-1 << VT_STRUCT_SHIFT));
708 /* cast to int to propagate signedness in following ops */
709 if ((vtop->type.t & VT_BTYPE) == VT_LLONG) {
710 type.t = VT_LLONG;
711 bits = 64;
712 } else
713 type.t = VT_INT;
714 if((vtop->type.t & VT_UNSIGNED) ||
715 (vtop->type.t & VT_BTYPE) == VT_BOOL)
716 type.t |= VT_UNSIGNED;
717 gen_cast(&type);
718 /* generate shifts */
719 vpushi(bits - (bit_pos + bit_size));
720 gen_op(TOK_SHL);
721 vpushi(bits - bit_size);
722 /* NOTE: transformed to SHR if unsigned */
723 gen_op(TOK_SAR);
724 r = gv(rc);
725 } else {
726 if (is_float(vtop->type.t) &&
727 (vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
728 Sym *sym;
729 int *ptr;
730 unsigned long offset;
731 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
732 CValue check;
733 #endif
734
735 /* XXX: unify with initializers handling ? */
736 /* CPUs usually cannot use float constants, so we store them
737 generically in data segment */
738 size = type_size(&vtop->type, &align);
739 offset = (data_section->data_offset + align - 1) & -align;
740 data_section->data_offset = offset;
741 /* XXX: not portable yet */
742 #if defined(__i386__) || defined(__x86_64__)
743 /* Zero pad x87 tenbyte long doubles */
744 if (size == LDOUBLE_SIZE) {
745 vtop->c.tab[2] &= 0xffff;
746 #if LDOUBLE_SIZE == 16
747 vtop->c.tab[3] = 0;
748 #endif
749 }
750 #endif
751 ptr = section_ptr_add(data_section, size);
752 size = size >> 2;
753 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
754 check.d = 1;
755 if(check.tab[0])
756 for(i=0;i<size;i++)
757 ptr[i] = vtop->c.tab[size-1-i];
758 else
759 #endif
760 for(i=0;i<size;i++)
761 ptr[i] = vtop->c.tab[i];
762 sym = get_sym_ref(&vtop->type, data_section, offset, size << 2);
763 vtop->r |= VT_LVAL | VT_SYM;
764 vtop->sym = sym;
765 vtop->c.ul = 0;
766 }
767 #ifdef CONFIG_TCC_BCHECK
768 if (vtop->r & VT_MUSTBOUND)
769 gbound();
770 #endif
771
772 r = vtop->r & VT_VALMASK;
773 rc2 = (rc & RC_FLOAT) ? RC_FLOAT : RC_INT;
774 if (rc == RC_IRET)
775 rc2 = RC_LRET;
776 #ifdef TCC_TARGET_X86_64
777 else if (rc == RC_FRET)
778 rc2 = RC_QRET;
779 #endif
780
781 /* need to reload if:
782 - constant
783 - lvalue (need to dereference pointer)
784 - already a register, but not in the right class */
785 if (r >= VT_CONST
786 || (vtop->r & VT_LVAL)
787 || !(reg_classes[r] & rc)
788 #ifdef TCC_TARGET_X86_64
789 || ((vtop->type.t & VT_BTYPE) == VT_QLONG && !(reg_classes[vtop->r2] & rc2))
790 || ((vtop->type.t & VT_BTYPE) == VT_QFLOAT && !(reg_classes[vtop->r2] & rc2))
791 #else
792 || ((vtop->type.t & VT_BTYPE) == VT_LLONG && !(reg_classes[vtop->r2] & rc2))
793 #endif
794 )
795 {
796 r = get_reg(rc);
797 #ifdef TCC_TARGET_X86_64
798 if (((vtop->type.t & VT_BTYPE) == VT_QLONG) || ((vtop->type.t & VT_BTYPE) == VT_QFLOAT)) {
799 int addr_type = VT_LLONG, load_size = 8, load_type = ((vtop->type.t & VT_BTYPE) == VT_QLONG) ? VT_LLONG : VT_DOUBLE;
800 #else
801 if ((vtop->type.t & VT_BTYPE) == VT_LLONG) {
802 int addr_type = VT_INT, load_size = 4, load_type = VT_INT;
803 #endif
804 int r2, original_type;
805 unsigned long long ll;
806 original_type = vtop->type.t;
807 /* two register type load : expand to two words
808 temporarily */
809 #ifndef TCC_TARGET_X86_64
810 if ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
811 /* load constant */
812 ll = vtop->c.ull;
813 vtop->c.ui = ll; /* first word */
814 load(r, vtop);
815 vtop->r = r; /* save register value */
816 vpushi(ll >> 32); /* second word */
817 } else
818 #endif
819 if (r >= VT_CONST || /* XXX: test to VT_CONST incorrect ? */
820 (vtop->r & VT_LVAL)) {
821 /* We do not want to modifier the long long
822 pointer here, so the safest (and less
823 efficient) is to save all the other registers
824 in the stack. XXX: totally inefficient. */
825 save_regs(1);
826 /* load from memory */
827 vtop->type.t = load_type;
828 load(r, vtop);
829 vdup();
830 vtop[-1].r = r; /* save register value */
831 /* increment pointer to get second word */
832 vtop->type.t = addr_type;
833 gaddrof();
834 vpushi(load_size);
835 gen_op('+');
836 vtop->r |= VT_LVAL;
837 vtop->type.t = load_type;
838 } else {
839 /* move registers */
840 load(r, vtop);
841 vdup();
842 vtop[-1].r = r; /* save register value */
843 vtop->r = vtop[-1].r2;
844 }
845 /* Allocate second register. Here we rely on the fact that
846 get_reg() tries first to free r2 of an SValue. */
847 r2 = get_reg(rc2);
848 load(r2, vtop);
849 vpop();
850 /* write second register */
851 vtop->r2 = r2;
852 vtop->type.t = original_type;
853 } else if ((vtop->r & VT_LVAL) && !is_float(vtop->type.t)) {
854 int t1, t;
855 /* lvalue of scalar type : need to use lvalue type
856 because of possible cast */
857 t = vtop->type.t;
858 t1 = t;
859 /* compute memory access type */
860 if (vtop->r & VT_REF)
861 #ifdef TCC_TARGET_X86_64
862 t = VT_PTR;
863 #else
864 t = VT_INT;
865 #endif
866 else if (vtop->r & VT_LVAL_BYTE)
867 t = VT_BYTE;
868 else if (vtop->r & VT_LVAL_SHORT)
869 t = VT_SHORT;
870 if (vtop->r & VT_LVAL_UNSIGNED)
871 t |= VT_UNSIGNED;
872 vtop->type.t = t;
873 load(r, vtop);
874 /* restore wanted type */
875 vtop->type.t = t1;
876 } else {
877 /* one register type load */
878 load(r, vtop);
879 }
880 }
881 vtop->r = r;
882 #ifdef TCC_TARGET_C67
883 /* uses register pairs for doubles */
884 if ((vtop->type.t & VT_BTYPE) == VT_DOUBLE)
885 vtop->r2 = r+1;
886 #endif
887 }
888 return r;
889 }
890
891 /* generate vtop[-1] and vtop[0] in resp. classes rc1 and rc2 */
892 ST_FUNC void gv2(int rc1, int rc2)
893 {
894 int v;
895
896 /* generate more generic register first. But VT_JMP or VT_CMP
897 values must be generated first in all cases to avoid possible
898 reload errors */
899 v = vtop[0].r & VT_VALMASK;
900 if (v != VT_CMP && (v & ~1) != VT_JMP && rc1 <= rc2) {
901 vswap();
902 gv(rc1);
903 vswap();
904 gv(rc2);
905 /* test if reload is needed for first register */
906 if ((vtop[-1].r & VT_VALMASK) >= VT_CONST) {
907 vswap();
908 gv(rc1);
909 vswap();
910 }
911 } else {
912 gv(rc2);
913 vswap();
914 gv(rc1);
915 vswap();
916 /* test if reload is needed for first register */
917 if ((vtop[0].r & VT_VALMASK) >= VT_CONST) {
918 gv(rc2);
919 }
920 }
921 }
922
923 /* wrapper around RC_FRET to return a register by type */
924 static int rc_fret(int t)
925 {
926 #ifdef TCC_TARGET_X86_64
927 if (t == VT_LDOUBLE) {
928 return RC_ST0;
929 }
930 #endif
931 return RC_FRET;
932 }
933
934 /* wrapper around REG_FRET to return a register by type */
935 static int reg_fret(int t)
936 {
937 #ifdef TCC_TARGET_X86_64
938 if (t == VT_LDOUBLE) {
939 return TREG_ST0;
940 }
941 #endif
942 return REG_FRET;
943 }
944
945 /* expand long long on stack in two int registers */
946 static void lexpand(void)
947 {
948 int u;
949
950 u = vtop->type.t & VT_UNSIGNED;
951 gv(RC_INT);
952 vdup();
953 vtop[0].r = vtop[-1].r2;
954 vtop[0].r2 = VT_CONST;
955 vtop[-1].r2 = VT_CONST;
956 vtop[0].type.t = VT_INT | u;
957 vtop[-1].type.t = VT_INT | u;
958 }
959
960 #ifdef TCC_TARGET_ARM
961 /* expand long long on stack */
962 ST_FUNC void lexpand_nr(void)
963 {
964 int u,v;
965
966 u = vtop->type.t & VT_UNSIGNED;
967 vdup();
968 vtop->r2 = VT_CONST;
969 vtop->type.t = VT_INT | u;
970 v=vtop[-1].r & (VT_VALMASK | VT_LVAL);
971 if (v == VT_CONST) {
972 vtop[-1].c.ui = vtop->c.ull;
973 vtop->c.ui = vtop->c.ull >> 32;
974 vtop->r = VT_CONST;
975 } else if (v == (VT_LVAL|VT_CONST) || v == (VT_LVAL|VT_LOCAL)) {
976 vtop->c.ui += 4;
977 vtop->r = vtop[-1].r;
978 } else if (v > VT_CONST) {
979 vtop--;
980 lexpand();
981 } else
982 vtop->r = vtop[-1].r2;
983 vtop[-1].r2 = VT_CONST;
984 vtop[-1].type.t = VT_INT | u;
985 }
986 #endif
987
988 /* build a long long from two ints */
989 static void lbuild(int t)
990 {
991 gv2(RC_INT, RC_INT);
992 vtop[-1].r2 = vtop[0].r;
993 vtop[-1].type.t = t;
994 vpop();
995 }
996
997 /* rotate n first stack elements to the bottom
998 I1 ... In -> I2 ... In I1 [top is right]
999 */
1000 ST_FUNC void vrotb(int n)
1001 {
1002 int i;
1003 SValue tmp;
1004
1005 tmp = vtop[-n + 1];
1006 for(i=-n+1;i!=0;i++)
1007 vtop[i] = vtop[i+1];
1008 vtop[0] = tmp;
1009 }
1010
1011 /* rotate the n elements before entry e towards the top
1012 I1 ... In ... -> In I1 ... I(n-1) ... [top is right]
1013 */
1014 ST_FUNC void vrote(SValue *e, int n)
1015 {
1016 int i;
1017 SValue tmp;
1018
1019 tmp = *e;
1020 for(i = 0;i < n - 1; i++)
1021 e[-i] = e[-i - 1];
1022 e[-n + 1] = tmp;
1023 }
1024
1025 /* rotate n first stack elements to the top
1026 I1 ... In -> In I1 ... I(n-1) [top is right]
1027 */
1028 ST_FUNC void vrott(int n)
1029 {
1030 vrote(vtop, n);
1031 }
1032
1033 /* pop stack value */
1034 ST_FUNC void vpop(void)
1035 {
1036 int v;
1037 v = vtop->r & VT_VALMASK;
1038 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
1039 /* for x86, we need to pop the FP stack */
1040 if (v == TREG_ST0 && !nocode_wanted) {
1041 o(0xd8dd); /* fstp %st(0) */
1042 } else
1043 #endif
1044 if (v == VT_JMP || v == VT_JMPI) {
1045 /* need to put correct jump if && or || without test */
1046 gsym(vtop->c.ul);
1047 }
1048 vtop--;
1049 }
1050
1051 /* convert stack entry to register and duplicate its value in another
1052 register */
1053 static void gv_dup(void)
1054 {
1055 int rc, t, r, r1;
1056 SValue sv;
1057
1058 t = vtop->type.t;
1059 if ((t & VT_BTYPE) == VT_LLONG) {
1060 lexpand();
1061 gv_dup();
1062 vswap();
1063 vrotb(3);
1064 gv_dup();
1065 vrotb(4);
1066 /* stack: H L L1 H1 */
1067 lbuild(t);
1068 vrotb(3);
1069 vrotb(3);
1070 vswap();
1071 lbuild(t);
1072 vswap();
1073 } else {
1074 /* duplicate value */
1075 rc = RC_INT;
1076 sv.type.t = VT_INT;
1077 if (is_float(t)) {
1078 rc = RC_FLOAT;
1079 #ifdef TCC_TARGET_X86_64
1080 if ((t & VT_BTYPE) == VT_LDOUBLE) {
1081 rc = RC_ST0;
1082 }
1083 #endif
1084 sv.type.t = t;
1085 }
1086 r = gv(rc);
1087 r1 = get_reg(rc);
1088 sv.r = r;
1089 sv.c.ul = 0;
1090 load(r1, &sv); /* move r to r1 */
1091 vdup();
1092 /* duplicates value */
1093 if (r != r1)
1094 vtop->r = r1;
1095 }
1096 }
1097
1098 #ifndef TCC_TARGET_X86_64
1099 /* generate CPU independent (unsigned) long long operations */
1100 static void gen_opl(int op)
1101 {
1102 int t, a, b, op1, c, i;
1103 int func;
1104 unsigned short reg_iret = REG_IRET;
1105 unsigned short reg_lret = REG_LRET;
1106 SValue tmp;
1107
1108 switch(op) {
1109 case '/':
1110 case TOK_PDIV:
1111 func = TOK___divdi3;
1112 goto gen_func;
1113 case TOK_UDIV:
1114 func = TOK___udivdi3;
1115 goto gen_func;
1116 case '%':
1117 func = TOK___moddi3;
1118 goto gen_mod_func;
1119 case TOK_UMOD:
1120 func = TOK___umoddi3;
1121 gen_mod_func:
1122 #ifdef TCC_ARM_EABI
1123 reg_iret = TREG_R2;
1124 reg_lret = TREG_R3;
1125 #endif
1126 gen_func:
1127 /* call generic long long function */
1128 vpush_global_sym(&func_old_type, func);
1129 vrott(3);
1130 gfunc_call(2);
1131 vpushi(0);
1132 vtop->r = reg_iret;
1133 vtop->r2 = reg_lret;
1134 break;
1135 case '^':
1136 case '&':
1137 case '|':
1138 case '*':
1139 case '+':
1140 case '-':
1141 t = vtop->type.t;
1142 vswap();
1143 lexpand();
1144 vrotb(3);
1145 lexpand();
1146 /* stack: L1 H1 L2 H2 */
1147 tmp = vtop[0];
1148 vtop[0] = vtop[-3];
1149 vtop[-3] = tmp;
1150 tmp = vtop[-2];
1151 vtop[-2] = vtop[-3];
1152 vtop[-3] = tmp;
1153 vswap();
1154 /* stack: H1 H2 L1 L2 */
1155 if (op == '*') {
1156 vpushv(vtop - 1);
1157 vpushv(vtop - 1);
1158 gen_op(TOK_UMULL);
1159 lexpand();
1160 /* stack: H1 H2 L1 L2 ML MH */
1161 for(i=0;i<4;i++)
1162 vrotb(6);
1163 /* stack: ML MH H1 H2 L1 L2 */
1164 tmp = vtop[0];
1165 vtop[0] = vtop[-2];
1166 vtop[-2] = tmp;
1167 /* stack: ML MH H1 L2 H2 L1 */
1168 gen_op('*');
1169 vrotb(3);
1170 vrotb(3);
1171 gen_op('*');
1172 /* stack: ML MH M1 M2 */
1173 gen_op('+');
1174 gen_op('+');
1175 } else if (op == '+' || op == '-') {
1176 /* XXX: add non carry method too (for MIPS or alpha) */
1177 if (op == '+')
1178 op1 = TOK_ADDC1;
1179 else
1180 op1 = TOK_SUBC1;
1181 gen_op(op1);
1182 /* stack: H1 H2 (L1 op L2) */
1183 vrotb(3);
1184 vrotb(3);
1185 gen_op(op1 + 1); /* TOK_xxxC2 */
1186 } else {
1187 gen_op(op);
1188 /* stack: H1 H2 (L1 op L2) */
1189 vrotb(3);
1190 vrotb(3);
1191 /* stack: (L1 op L2) H1 H2 */
1192 gen_op(op);
1193 /* stack: (L1 op L2) (H1 op H2) */
1194 }
1195 /* stack: L H */
1196 lbuild(t);
1197 break;
1198 case TOK_SAR:
1199 case TOK_SHR:
1200 case TOK_SHL:
1201 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
1202 t = vtop[-1].type.t;
1203 vswap();
1204 lexpand();
1205 vrotb(3);
1206 /* stack: L H shift */
1207 c = (int)vtop->c.i;
1208 /* constant: simpler */
1209 /* NOTE: all comments are for SHL. the other cases are
1210 done by swaping words */
1211 vpop();
1212 if (op != TOK_SHL)
1213 vswap();
1214 if (c >= 32) {
1215 /* stack: L H */
1216 vpop();
1217 if (c > 32) {
1218 vpushi(c - 32);
1219 gen_op(op);
1220 }
1221 if (op != TOK_SAR) {
1222 vpushi(0);
1223 } else {
1224 gv_dup();
1225 vpushi(31);
1226 gen_op(TOK_SAR);
1227 }
1228 vswap();
1229 } else {
1230 vswap();
1231 gv_dup();
1232 /* stack: H L L */
1233 vpushi(c);
1234 gen_op(op);
1235 vswap();
1236 vpushi(32 - c);
1237 if (op == TOK_SHL)
1238 gen_op(TOK_SHR);
1239 else
1240 gen_op(TOK_SHL);
1241 vrotb(3);
1242 /* stack: L L H */
1243 vpushi(c);
1244 if (op == TOK_SHL)
1245 gen_op(TOK_SHL);
1246 else
1247 gen_op(TOK_SHR);
1248 gen_op('|');
1249 }
1250 if (op != TOK_SHL)
1251 vswap();
1252 lbuild(t);
1253 } else {
1254 /* XXX: should provide a faster fallback on x86 ? */
1255 switch(op) {
1256 case TOK_SAR:
1257 func = TOK___ashrdi3;
1258 goto gen_func;
1259 case TOK_SHR:
1260 func = TOK___lshrdi3;
1261 goto gen_func;
1262 case TOK_SHL:
1263 func = TOK___ashldi3;
1264 goto gen_func;
1265 }
1266 }
1267 break;
1268 default:
1269 /* compare operations */
1270 t = vtop->type.t;
1271 vswap();
1272 lexpand();
1273 vrotb(3);
1274 lexpand();
1275 /* stack: L1 H1 L2 H2 */
1276 tmp = vtop[-1];
1277 vtop[-1] = vtop[-2];
1278 vtop[-2] = tmp;
1279 /* stack: L1 L2 H1 H2 */
1280 /* compare high */
1281 op1 = op;
1282 /* when values are equal, we need to compare low words. since
1283 the jump is inverted, we invert the test too. */
1284 if (op1 == TOK_LT)
1285 op1 = TOK_LE;
1286 else if (op1 == TOK_GT)
1287 op1 = TOK_GE;
1288 else if (op1 == TOK_ULT)
1289 op1 = TOK_ULE;
1290 else if (op1 == TOK_UGT)
1291 op1 = TOK_UGE;
1292 a = 0;
1293 b = 0;
1294 gen_op(op1);
1295 if (op1 != TOK_NE) {
1296 a = gtst(1, 0);
1297 }
1298 if (op != TOK_EQ) {
1299 /* generate non equal test */
1300 /* XXX: NOT PORTABLE yet */
1301 if (a == 0) {
1302 b = gtst(0, 0);
1303 } else {
1304 #if defined(TCC_TARGET_I386)
1305 b = psym(0x850f, 0);
1306 #elif defined(TCC_TARGET_ARM)
1307 b = ind;
1308 o(0x1A000000 | encbranch(ind, 0, 1));
1309 #elif defined(TCC_TARGET_C67)
1310 tcc_error("not implemented");
1311 #else
1312 #error not supported
1313 #endif
1314 }
1315 }
1316 /* compare low. Always unsigned */
1317 op1 = op;
1318 if (op1 == TOK_LT)
1319 op1 = TOK_ULT;
1320 else if (op1 == TOK_LE)
1321 op1 = TOK_ULE;
1322 else if (op1 == TOK_GT)
1323 op1 = TOK_UGT;
1324 else if (op1 == TOK_GE)
1325 op1 = TOK_UGE;
1326 gen_op(op1);
1327 a = gtst(1, a);
1328 gsym(b);
1329 vseti(VT_JMPI, a);
1330 break;
1331 }
1332 }
1333 #endif
1334
1335 /* handle integer constant optimizations and various machine
1336 independent opt */
1337 static void gen_opic(int op)
1338 {
1339 int c1, c2, t1, t2, n;
1340 SValue *v1, *v2;
1341 long long l1, l2;
1342 typedef unsigned long long U;
1343
1344 v1 = vtop - 1;
1345 v2 = vtop;
1346 t1 = v1->type.t & VT_BTYPE;
1347 t2 = v2->type.t & VT_BTYPE;
1348
1349 if (t1 == VT_LLONG)
1350 l1 = v1->c.ll;
1351 else if (v1->type.t & VT_UNSIGNED)
1352 l1 = v1->c.ui;
1353 else
1354 l1 = v1->c.i;
1355
1356 if (t2 == VT_LLONG)
1357 l2 = v2->c.ll;
1358 else if (v2->type.t & VT_UNSIGNED)
1359 l2 = v2->c.ui;
1360 else
1361 l2 = v2->c.i;
1362
1363 /* currently, we cannot do computations with forward symbols */
1364 c1 = (v1->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1365 c2 = (v2->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1366 if (c1 && c2) {
1367 switch(op) {
1368 case '+': l1 += l2; break;
1369 case '-': l1 -= l2; break;
1370 case '&': l1 &= l2; break;
1371 case '^': l1 ^= l2; break;
1372 case '|': l1 |= l2; break;
1373 case '*': l1 *= l2; break;
1374
1375 case TOK_PDIV:
1376 case '/':
1377 case '%':
1378 case TOK_UDIV:
1379 case TOK_UMOD:
1380 /* if division by zero, generate explicit division */
1381 if (l2 == 0) {
1382 if (const_wanted)
1383 tcc_error("division by zero in constant");
1384 goto general_case;
1385 }
1386 switch(op) {
1387 default: l1 /= l2; break;
1388 case '%': l1 %= l2; break;
1389 case TOK_UDIV: l1 = (U)l1 / l2; break;
1390 case TOK_UMOD: l1 = (U)l1 % l2; break;
1391 }
1392 break;
1393 case TOK_SHL: l1 <<= l2; break;
1394 case TOK_SHR: l1 = (U)l1 >> l2; break;
1395 case TOK_SAR: l1 >>= l2; break;
1396 /* tests */
1397 case TOK_ULT: l1 = (U)l1 < (U)l2; break;
1398 case TOK_UGE: l1 = (U)l1 >= (U)l2; break;
1399 case TOK_EQ: l1 = l1 == l2; break;
1400 case TOK_NE: l1 = l1 != l2; break;
1401 case TOK_ULE: l1 = (U)l1 <= (U)l2; break;
1402 case TOK_UGT: l1 = (U)l1 > (U)l2; break;
1403 case TOK_LT: l1 = l1 < l2; break;
1404 case TOK_GE: l1 = l1 >= l2; break;
1405 case TOK_LE: l1 = l1 <= l2; break;
1406 case TOK_GT: l1 = l1 > l2; break;
1407 /* logical */
1408 case TOK_LAND: l1 = l1 && l2; break;
1409 case TOK_LOR: l1 = l1 || l2; break;
1410 default:
1411 goto general_case;
1412 }
1413 v1->c.ll = l1;
1414 vtop--;
1415 } else {
1416 /* if commutative ops, put c2 as constant */
1417 if (c1 && (op == '+' || op == '&' || op == '^' ||
1418 op == '|' || op == '*')) {
1419 vswap();
1420 c2 = c1; //c = c1, c1 = c2, c2 = c;
1421 l2 = l1; //l = l1, l1 = l2, l2 = l;
1422 }
1423 /* Filter out NOP operations like x*1, x-0, x&-1... */
1424 if (c2 && (((op == '*' || op == '/' || op == TOK_UDIV ||
1425 op == TOK_PDIV) &&
1426 l2 == 1) ||
1427 ((op == '+' || op == '-' || op == '|' || op == '^' ||
1428 op == TOK_SHL || op == TOK_SHR || op == TOK_SAR) &&
1429 l2 == 0) ||
1430 (op == '&' &&
1431 l2 == -1))) {
1432 /* nothing to do */
1433 vtop--;
1434 } else if (c2 && (op == '*' || op == TOK_PDIV || op == TOK_UDIV)) {
1435 /* try to use shifts instead of muls or divs */
1436 if (l2 > 0 && (l2 & (l2 - 1)) == 0) {
1437 n = -1;
1438 while (l2) {
1439 l2 >>= 1;
1440 n++;
1441 }
1442 vtop->c.ll = n;
1443 if (op == '*')
1444 op = TOK_SHL;
1445 else if (op == TOK_PDIV)
1446 op = TOK_SAR;
1447 else
1448 op = TOK_SHR;
1449 }
1450 goto general_case;
1451 } else if (c2 && (op == '+' || op == '-') &&
1452 (((vtop[-1].r & (VT_VALMASK | VT_LVAL | VT_SYM)) == (VT_CONST | VT_SYM))
1453 || (vtop[-1].r & (VT_VALMASK | VT_LVAL)) == VT_LOCAL)) {
1454 /* symbol + constant case */
1455 if (op == '-')
1456 l2 = -l2;
1457 vtop--;
1458 vtop->c.ll += l2;
1459 } else {
1460 general_case:
1461 if (!nocode_wanted) {
1462 /* call low level op generator */
1463 if (t1 == VT_LLONG || t2 == VT_LLONG)
1464 gen_opl(op);
1465 else
1466 gen_opi(op);
1467 } else {
1468 vtop--;
1469 }
1470 }
1471 }
1472 }
1473
1474 /* generate a floating point operation with constant propagation */
1475 static void gen_opif(int op)
1476 {
1477 int c1, c2;
1478 SValue *v1, *v2;
1479 long double f1, f2;
1480
1481 v1 = vtop - 1;
1482 v2 = vtop;
1483 /* currently, we cannot do computations with forward symbols */
1484 c1 = (v1->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1485 c2 = (v2->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1486 if (c1 && c2) {
1487 if (v1->type.t == VT_FLOAT) {
1488 f1 = v1->c.f;
1489 f2 = v2->c.f;
1490 } else if (v1->type.t == VT_DOUBLE) {
1491 f1 = v1->c.d;
1492 f2 = v2->c.d;
1493 } else {
1494 f1 = v1->c.ld;
1495 f2 = v2->c.ld;
1496 }
1497
1498 /* NOTE: we only do constant propagation if finite number (not
1499 NaN or infinity) (ANSI spec) */
1500 if (!ieee_finite(f1) || !ieee_finite(f2))
1501 goto general_case;
1502
1503 switch(op) {
1504 case '+': f1 += f2; break;
1505 case '-': f1 -= f2; break;
1506 case '*': f1 *= f2; break;
1507 case '/':
1508 if (f2 == 0.0) {
1509 if (const_wanted)
1510 tcc_error("division by zero in constant");
1511 goto general_case;
1512 }
1513 f1 /= f2;
1514 break;
1515 /* XXX: also handles tests ? */
1516 default:
1517 goto general_case;
1518 }
1519 /* XXX: overflow test ? */
1520 if (v1->type.t == VT_FLOAT) {
1521 v1->c.f = f1;
1522 } else if (v1->type.t == VT_DOUBLE) {
1523 v1->c.d = f1;
1524 } else {
1525 v1->c.ld = f1;
1526 }
1527 vtop--;
1528 } else {
1529 general_case:
1530 if (!nocode_wanted) {
1531 gen_opf(op);
1532 } else {
1533 vtop--;
1534 }
1535 }
1536 }
1537
1538 static int pointed_size(CType *type)
1539 {
1540 int align;
1541 return type_size(pointed_type(type), &align);
1542 }
1543
1544 static void vla_runtime_pointed_size(CType *type)
1545 {
1546 int align;
1547 vla_runtime_type_size(pointed_type(type), &align);
1548 }
1549
1550 static inline int is_null_pointer(SValue *p)
1551 {
1552 if ((p->r & (VT_VALMASK | VT_LVAL | VT_SYM)) != VT_CONST)
1553 return 0;
1554 return ((p->type.t & VT_BTYPE) == VT_INT && p->c.i == 0) ||
1555 ((p->type.t & VT_BTYPE) == VT_LLONG && p->c.ll == 0) ||
1556 ((p->type.t & VT_BTYPE) == VT_PTR && p->c.ptr == 0);
1557 }
1558
1559 static inline int is_integer_btype(int bt)
1560 {
1561 return (bt == VT_BYTE || bt == VT_SHORT ||
1562 bt == VT_INT || bt == VT_LLONG);
1563 }
1564
1565 /* check types for comparison or substraction of pointers */
1566 static void check_comparison_pointer_types(SValue *p1, SValue *p2, int op)
1567 {
1568 CType *type1, *type2, tmp_type1, tmp_type2;
1569 int bt1, bt2;
1570
1571 /* null pointers are accepted for all comparisons as gcc */
1572 if (is_null_pointer(p1) || is_null_pointer(p2))
1573 return;
1574 type1 = &p1->type;
1575 type2 = &p2->type;
1576 bt1 = type1->t & VT_BTYPE;
1577 bt2 = type2->t & VT_BTYPE;
1578 /* accept comparison between pointer and integer with a warning */
1579 if ((is_integer_btype(bt1) || is_integer_btype(bt2)) && op != '-') {
1580 if (op != TOK_LOR && op != TOK_LAND )
1581 tcc_warning("comparison between pointer and integer");
1582 return;
1583 }
1584
1585 /* both must be pointers or implicit function pointers */
1586 if (bt1 == VT_PTR) {
1587 type1 = pointed_type(type1);
1588 } else if (bt1 != VT_FUNC)
1589 goto invalid_operands;
1590
1591 if (bt2 == VT_PTR) {
1592 type2 = pointed_type(type2);
1593 } else if (bt2 != VT_FUNC) {
1594 invalid_operands:
1595 tcc_error("invalid operands to binary %s", get_tok_str(op, NULL));
1596 }
1597 if ((type1->t & VT_BTYPE) == VT_VOID ||
1598 (type2->t & VT_BTYPE) == VT_VOID)
1599 return;
1600 tmp_type1 = *type1;
1601 tmp_type2 = *type2;
1602 tmp_type1.t &= ~(VT_UNSIGNED | VT_CONSTANT | VT_VOLATILE);
1603 tmp_type2.t &= ~(VT_UNSIGNED | VT_CONSTANT | VT_VOLATILE);
1604 if (!is_compatible_types(&tmp_type1, &tmp_type2)) {
1605 /* gcc-like error if '-' is used */
1606 if (op == '-')
1607 goto invalid_operands;
1608 else
1609 tcc_warning("comparison of distinct pointer types lacks a cast");
1610 }
1611 }
1612
1613 /* generic gen_op: handles types problems */
1614 ST_FUNC void gen_op(int op)
1615 {
1616 int u, t1, t2, bt1, bt2, t;
1617 CType type1;
1618
1619 t1 = vtop[-1].type.t;
1620 t2 = vtop[0].type.t;
1621 bt1 = t1 & VT_BTYPE;
1622 bt2 = t2 & VT_BTYPE;
1623
1624 if (bt1 == VT_PTR || bt2 == VT_PTR) {
1625 /* at least one operand is a pointer */
1626 /* relationnal op: must be both pointers */
1627 if (op >= TOK_ULT && op <= TOK_LOR) {
1628 check_comparison_pointer_types(vtop - 1, vtop, op);
1629 /* pointers are handled are unsigned */
1630 #ifdef TCC_TARGET_X86_64
1631 t = VT_LLONG | VT_UNSIGNED;
1632 #else
1633 t = VT_INT | VT_UNSIGNED;
1634 #endif
1635 goto std_op;
1636 }
1637 /* if both pointers, then it must be the '-' op */
1638 if (bt1 == VT_PTR && bt2 == VT_PTR) {
1639 if (op != '-')
1640 tcc_error("cannot use pointers here");
1641 check_comparison_pointer_types(vtop - 1, vtop, op);
1642 /* XXX: check that types are compatible */
1643 if (vtop[-1].type.t & VT_VLA) {
1644 vla_runtime_pointed_size(&vtop[-1].type);
1645 } else {
1646 vpushi(pointed_size(&vtop[-1].type));
1647 }
1648 vrott(3);
1649 gen_opic(op);
1650 /* set to integer type */
1651 #ifdef TCC_TARGET_X86_64
1652 vtop->type.t = VT_LLONG;
1653 #else
1654 vtop->type.t = VT_INT;
1655 #endif
1656 vswap();
1657 gen_op(TOK_PDIV);
1658 } else {
1659 /* exactly one pointer : must be '+' or '-'. */
1660 if (op != '-' && op != '+')
1661 tcc_error("cannot use pointers here");
1662 /* Put pointer as first operand */
1663 if (bt2 == VT_PTR) {
1664 vswap();
1665 swap(&t1, &t2);
1666 }
1667 type1 = vtop[-1].type;
1668 type1.t &= ~VT_ARRAY;
1669 if (vtop[-1].type.t & VT_VLA)
1670 vla_runtime_pointed_size(&vtop[-1].type);
1671 else {
1672 u = pointed_size(&vtop[-1].type);
1673 if (u < 0)
1674 tcc_error("unknown array element size");
1675 #ifdef TCC_TARGET_X86_64
1676 vpushll(u);
1677 #else
1678 /* XXX: cast to int ? (long long case) */
1679 vpushi(u);
1680 #endif
1681 }
1682 gen_op('*');
1683 #ifdef CONFIG_TCC_BCHECK
1684 /* if evaluating constant expression, no code should be
1685 generated, so no bound check */
1686 if (tcc_state->do_bounds_check && !const_wanted) {
1687 /* if bounded pointers, we generate a special code to
1688 test bounds */
1689 if (op == '-') {
1690 vpushi(0);
1691 vswap();
1692 gen_op('-');
1693 }
1694 gen_bounded_ptr_add();
1695 } else
1696 #endif
1697 {
1698 gen_opic(op);
1699 }
1700 /* put again type if gen_opic() swaped operands */
1701 vtop->type = type1;
1702 }
1703 } else if (is_float(bt1) || is_float(bt2)) {
1704 /* compute bigger type and do implicit casts */
1705 if (bt1 == VT_LDOUBLE || bt2 == VT_LDOUBLE) {
1706 t = VT_LDOUBLE;
1707 } else if (bt1 == VT_DOUBLE || bt2 == VT_DOUBLE) {
1708 t = VT_DOUBLE;
1709 } else {
1710 t = VT_FLOAT;
1711 }
1712 /* floats can only be used for a few operations */
1713 if (op != '+' && op != '-' && op != '*' && op != '/' &&
1714 (op < TOK_ULT || op > TOK_GT))
1715 tcc_error("invalid operands for binary operation");
1716 goto std_op;
1717 } else if (op == TOK_SHR || op == TOK_SAR || op == TOK_SHL) {
1718 t = bt1 == VT_LLONG ? VT_LLONG : VT_INT;
1719 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (t | VT_UNSIGNED))
1720 t |= VT_UNSIGNED;
1721 goto std_op;
1722 } else if (bt1 == VT_LLONG || bt2 == VT_LLONG) {
1723 /* cast to biggest op */
1724 t = VT_LLONG;
1725 /* convert to unsigned if it does not fit in a long long */
1726 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED) ||
1727 (t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED))
1728 t |= VT_UNSIGNED;
1729 goto std_op;
1730 } else if (bt1 == VT_STRUCT || bt2 == VT_STRUCT) {
1731 tcc_error("comparison of struct");
1732 } else {
1733 /* integer operations */
1734 t = VT_INT;
1735 /* convert to unsigned if it does not fit in an integer */
1736 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED) ||
1737 (t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED))
1738 t |= VT_UNSIGNED;
1739 std_op:
1740 /* XXX: currently, some unsigned operations are explicit, so
1741 we modify them here */
1742 if (t & VT_UNSIGNED) {
1743 if (op == TOK_SAR)
1744 op = TOK_SHR;
1745 else if (op == '/')
1746 op = TOK_UDIV;
1747 else if (op == '%')
1748 op = TOK_UMOD;
1749 else if (op == TOK_LT)
1750 op = TOK_ULT;
1751 else if (op == TOK_GT)
1752 op = TOK_UGT;
1753 else if (op == TOK_LE)
1754 op = TOK_ULE;
1755 else if (op == TOK_GE)
1756 op = TOK_UGE;
1757 }
1758 vswap();
1759 type1.t = t;
1760 gen_cast(&type1);
1761 vswap();
1762 /* special case for shifts and long long: we keep the shift as
1763 an integer */
1764 if (op == TOK_SHR || op == TOK_SAR || op == TOK_SHL)
1765 type1.t = VT_INT;
1766 gen_cast(&type1);
1767 if (is_float(t))
1768 gen_opif(op);
1769 else
1770 gen_opic(op);
1771 if (op >= TOK_ULT && op <= TOK_GT) {
1772 /* relationnal op: the result is an int */
1773 vtop->type.t = VT_INT;
1774 } else {
1775 vtop->type.t = t;
1776 }
1777 }
1778 }
1779
1780 #ifndef TCC_TARGET_ARM
1781 /* generic itof for unsigned long long case */
1782 static void gen_cvt_itof1(int t)
1783 {
1784 if ((vtop->type.t & (VT_BTYPE | VT_UNSIGNED)) ==
1785 (VT_LLONG | VT_UNSIGNED)) {
1786
1787 if (t == VT_FLOAT)
1788 vpush_global_sym(&func_old_type, TOK___floatundisf);
1789 #if LDOUBLE_SIZE != 8
1790 else if (t == VT_LDOUBLE)
1791 vpush_global_sym(&func_old_type, TOK___floatundixf);
1792 #endif
1793 else
1794 vpush_global_sym(&func_old_type, TOK___floatundidf);
1795 vrott(2);
1796 gfunc_call(1);
1797 vpushi(0);
1798 vtop->r = reg_fret(t);
1799 } else {
1800 gen_cvt_itof(t);
1801 }
1802 }
1803 #endif
1804
1805 /* generic ftoi for unsigned long long case */
1806 static void gen_cvt_ftoi1(int t)
1807 {
1808 int st;
1809
1810 if (t == (VT_LLONG | VT_UNSIGNED)) {
1811 /* not handled natively */
1812 st = vtop->type.t & VT_BTYPE;
1813 if (st == VT_FLOAT)
1814 vpush_global_sym(&func_old_type, TOK___fixunssfdi);
1815 #if LDOUBLE_SIZE != 8
1816 else if (st == VT_LDOUBLE)
1817 vpush_global_sym(&func_old_type, TOK___fixunsxfdi);
1818 #endif
1819 else
1820 vpush_global_sym(&func_old_type, TOK___fixunsdfdi);
1821 vrott(2);
1822 gfunc_call(1);
1823 vpushi(0);
1824 vtop->r = REG_IRET;
1825 vtop->r2 = REG_LRET;
1826 } else {
1827 gen_cvt_ftoi(t);
1828 }
1829 }
1830
1831 /* force char or short cast */
1832 static void force_charshort_cast(int t)
1833 {
1834 int bits, dbt;
1835 dbt = t & VT_BTYPE;
1836 /* XXX: add optimization if lvalue : just change type and offset */
1837 if (dbt == VT_BYTE)
1838 bits = 8;
1839 else
1840 bits = 16;
1841 if (t & VT_UNSIGNED) {
1842 vpushi((1 << bits) - 1);
1843 gen_op('&');
1844 } else {
1845 bits = 32 - bits;
1846 vpushi(bits);
1847 gen_op(TOK_SHL);
1848 /* result must be signed or the SAR is converted to an SHL
1849 This was not the case when "t" was a signed short
1850 and the last value on the stack was an unsigned int */
1851 vtop->type.t &= ~VT_UNSIGNED;
1852 vpushi(bits);
1853 gen_op(TOK_SAR);
1854 }
1855 }
1856
1857 /* cast 'vtop' to 'type'. Casting to bitfields is forbidden. */
1858 static void gen_cast(CType *type)
1859 {
1860 int sbt, dbt, sf, df, c, p;
1861
1862 /* special delayed cast for char/short */
1863 /* XXX: in some cases (multiple cascaded casts), it may still
1864 be incorrect */
1865 if (vtop->r & VT_MUSTCAST) {
1866 vtop->r &= ~VT_MUSTCAST;
1867 force_charshort_cast(vtop->type.t);
1868 }
1869
1870 /* bitfields first get cast to ints */
1871 if (vtop->type.t & VT_BITFIELD) {
1872 gv(RC_INT);
1873 }
1874
1875 dbt = type->t & (VT_BTYPE | VT_UNSIGNED);
1876 sbt = vtop->type.t & (VT_BTYPE | VT_UNSIGNED);
1877
1878 if (sbt != dbt) {
1879 sf = is_float(sbt);
1880 df = is_float(dbt);
1881 c = (vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
1882 p = (vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == (VT_CONST | VT_SYM);
1883 if (c) {
1884 /* constant case: we can do it now */
1885 /* XXX: in ISOC, cannot do it if error in convert */
1886 if (sbt == VT_FLOAT)
1887 vtop->c.ld = vtop->c.f;
1888 else if (sbt == VT_DOUBLE)
1889 vtop->c.ld = vtop->c.d;
1890
1891 if (df) {
1892 if ((sbt & VT_BTYPE) == VT_LLONG) {
1893 if (sbt & VT_UNSIGNED)
1894 vtop->c.ld = vtop->c.ull;
1895 else
1896 vtop->c.ld = vtop->c.ll;
1897 } else if(!sf) {
1898 if (sbt & VT_UNSIGNED)
1899 vtop->c.ld = vtop->c.ui;
1900 else
1901 vtop->c.ld = vtop->c.i;
1902 }
1903
1904 if (dbt == VT_FLOAT)
1905 vtop->c.f = (float)vtop->c.ld;
1906 else if (dbt == VT_DOUBLE)
1907 vtop->c.d = (double)vtop->c.ld;
1908 } else if (sf && dbt == (VT_LLONG|VT_UNSIGNED)) {
1909 vtop->c.ull = (unsigned long long)vtop->c.ld;
1910 } else if (sf && dbt == VT_BOOL) {
1911 vtop->c.i = (vtop->c.ld != 0);
1912 } else {
1913 if(sf)
1914 vtop->c.ll = (long long)vtop->c.ld;
1915 else if (sbt == (VT_LLONG|VT_UNSIGNED))
1916 vtop->c.ll = vtop->c.ull;
1917 else if (sbt & VT_UNSIGNED)
1918 vtop->c.ll = vtop->c.ui;
1919 #ifdef TCC_TARGET_X86_64
1920 else if (sbt == VT_PTR)
1921 ;
1922 #endif
1923 else if (sbt != VT_LLONG)
1924 vtop->c.ll = vtop->c.i;
1925
1926 if (dbt == (VT_LLONG|VT_UNSIGNED))
1927 vtop->c.ull = vtop->c.ll;
1928 else if (dbt == VT_BOOL)
1929 vtop->c.i = (vtop->c.ll != 0);
1930 else if (dbt != VT_LLONG) {
1931 int s = 0;
1932 if ((dbt & VT_BTYPE) == VT_BYTE)
1933 s = 24;
1934 else if ((dbt & VT_BTYPE) == VT_SHORT)
1935 s = 16;
1936
1937 if(dbt & VT_UNSIGNED)
1938 vtop->c.ui = ((unsigned int)vtop->c.ll << s) >> s;
1939 else
1940 vtop->c.i = ((int)vtop->c.ll << s) >> s;
1941 }
1942 }
1943 } else if (p && dbt == VT_BOOL) {
1944 vtop->r = VT_CONST;
1945 vtop->c.i = 1;
1946 } else if (!nocode_wanted) {
1947 /* non constant case: generate code */
1948 if (sf && df) {
1949 /* convert from fp to fp */
1950 gen_cvt_ftof(dbt);
1951 } else if (df) {
1952 /* convert int to fp */
1953 gen_cvt_itof1(dbt);
1954 } else if (sf) {
1955 /* convert fp to int */
1956 if (dbt == VT_BOOL) {
1957 vpushi(0);
1958 gen_op(TOK_NE);
1959 } else {
1960 /* we handle char/short/etc... with generic code */
1961 if (dbt != (VT_INT | VT_UNSIGNED) &&
1962 dbt != (VT_LLONG | VT_UNSIGNED) &&
1963 dbt != VT_LLONG)
1964 dbt = VT_INT;
1965 gen_cvt_ftoi1(dbt);
1966 if (dbt == VT_INT && (type->t & (VT_BTYPE | VT_UNSIGNED)) != dbt) {
1967 /* additional cast for char/short... */
1968 vtop->type.t = dbt;
1969 gen_cast(type);
1970 }
1971 }
1972 #ifndef TCC_TARGET_X86_64
1973 } else if ((dbt & VT_BTYPE) == VT_LLONG) {
1974 if ((sbt & VT_BTYPE) != VT_LLONG) {
1975 /* scalar to long long */
1976 /* machine independent conversion */
1977 gv(RC_INT);
1978 /* generate high word */
1979 if (sbt == (VT_INT | VT_UNSIGNED)) {
1980 vpushi(0);
1981 gv(RC_INT);
1982 } else {
1983 if (sbt == VT_PTR) {
1984 /* cast from pointer to int before we apply
1985 shift operation, which pointers don't support*/
1986 gen_cast(&int_type);
1987 }
1988 gv_dup();
1989 vpushi(31);
1990 gen_op(TOK_SAR);
1991 }
1992 /* patch second register */
1993 vtop[-1].r2 = vtop->r;
1994 vpop();
1995 }
1996 #else
1997 } else if ((dbt & VT_BTYPE) == VT_LLONG ||
1998 (dbt & VT_BTYPE) == VT_PTR ||
1999 (dbt & VT_BTYPE) == VT_FUNC) {
2000 if ((sbt & VT_BTYPE) != VT_LLONG &&
2001 (sbt & VT_BTYPE) != VT_PTR &&
2002 (sbt & VT_BTYPE) != VT_FUNC) {
2003 /* need to convert from 32bit to 64bit */
2004 int r = gv(RC_INT);
2005 if (sbt != (VT_INT | VT_UNSIGNED)) {
2006 /* x86_64 specific: movslq */
2007 o(0x6348);
2008 o(0xc0 + (REG_VALUE(r) << 3) + REG_VALUE(r));
2009 }
2010 }
2011 #endif
2012 } else if (dbt == VT_BOOL) {
2013 /* scalar to bool */
2014 vpushi(0);
2015 gen_op(TOK_NE);
2016 } else if ((dbt & VT_BTYPE) == VT_BYTE ||
2017 (dbt & VT_BTYPE) == VT_SHORT) {
2018 if (sbt == VT_PTR) {
2019 vtop->type.t = VT_INT;
2020 tcc_warning("nonportable conversion from pointer to char/short");
2021 }
2022 force_charshort_cast(dbt);
2023 } else if ((dbt & VT_BTYPE) == VT_INT) {
2024 /* scalar to int */
2025 if (sbt == VT_LLONG) {
2026 /* from long long: just take low order word */
2027 lexpand();
2028 vpop();
2029 }
2030 /* if lvalue and single word type, nothing to do because
2031 the lvalue already contains the real type size (see
2032 VT_LVAL_xxx constants) */
2033 }
2034 }
2035 } else if ((dbt & VT_BTYPE) == VT_PTR && !(vtop->r & VT_LVAL)) {
2036 /* if we are casting between pointer types,
2037 we must update the VT_LVAL_xxx size */
2038 vtop->r = (vtop->r & ~VT_LVAL_TYPE)
2039 | (lvalue_type(type->ref->type.t) & VT_LVAL_TYPE);
2040 }
2041 vtop->type = *type;
2042 }
2043
2044 /* return type size as known at compile time. Put alignment at 'a' */
2045 ST_FUNC int type_size(CType *type, int *a)
2046 {
2047 Sym *s;
2048 int bt;
2049
2050 bt = type->t & VT_BTYPE;
2051 if (bt == VT_STRUCT) {
2052 /* struct/union */
2053 s = type->ref;
2054 *a = s->r;
2055 return s->c;
2056 } else if (bt == VT_PTR) {
2057 if (type->t & VT_ARRAY) {
2058 int ts;
2059
2060 s = type->ref;
2061 ts = type_size(&s->type, a);
2062
2063 if (ts < 0 && s->c < 0)
2064 ts = -ts;
2065
2066 return ts * s->c;
2067 } else {
2068 *a = PTR_SIZE;
2069 return PTR_SIZE;
2070 }
2071 } else if (bt == VT_LDOUBLE) {
2072 *a = LDOUBLE_ALIGN;
2073 return LDOUBLE_SIZE;
2074 } else if (bt == VT_DOUBLE || bt == VT_LLONG) {
2075 #ifdef TCC_TARGET_I386
2076 #ifdef TCC_TARGET_PE
2077 *a = 8;
2078 #else
2079 *a = 4;
2080 #endif
2081 #elif defined(TCC_TARGET_ARM)
2082 #ifdef TCC_ARM_EABI
2083 *a = 8;
2084 #else
2085 *a = 4;
2086 #endif
2087 #else
2088 *a = 8;
2089 #endif
2090 return 8;
2091 } else if (bt == VT_INT || bt == VT_ENUM || bt == VT_FLOAT) {
2092 *a = 4;
2093 return 4;
2094 } else if (bt == VT_SHORT) {
2095 *a = 2;
2096 return 2;
2097 } else if (bt == VT_QLONG || bt == VT_QFLOAT) {
2098 *a = 8;
2099 return 16;
2100 } else {
2101 /* char, void, function, _Bool */
2102 *a = 1;
2103 return 1;
2104 }
2105 }
2106
2107 /* push type size as known at runtime time on top of value stack. Put
2108 alignment at 'a' */
2109 ST_FUNC void vla_runtime_type_size(CType *type, int *a)
2110 {
2111 if (type->t & VT_VLA) {
2112 vset(&int_type, VT_LOCAL|VT_LVAL, type->ref->c);
2113 } else {
2114 vpushi(type_size(type, a));
2115 }
2116 }
2117
2118 static void vla_sp_save(void) {
2119 if (!(vla_flags & VLA_SP_LOC_SET)) {
2120 *vla_sp_loc = (loc -= PTR_SIZE);
2121 vla_flags |= VLA_SP_LOC_SET;
2122 }
2123 if (!(vla_flags & VLA_SP_SAVED)) {
2124 gen_vla_sp_save(*vla_sp_loc);
2125 vla_flags |= VLA_SP_SAVED;
2126 }
2127 }
2128
2129 /* return the pointed type of t */
2130 static inline CType *pointed_type(CType *type)
2131 {
2132 return &type->ref->type;
2133 }
2134
2135 /* modify type so that its it is a pointer to type. */
2136 ST_FUNC void mk_pointer(CType *type)
2137 {
2138 Sym *s;
2139 s = sym_push(SYM_FIELD, type, 0, -1);
2140 type->t = VT_PTR | (type->t & ~VT_TYPE);
2141 type->ref = s;
2142 }
2143
2144 /* compare function types. OLD functions match any new functions */
2145 static int is_compatible_func(CType *type1, CType *type2)
2146 {
2147 Sym *s1, *s2;
2148
2149 s1 = type1->ref;
2150 s2 = type2->ref;
2151 if (!is_compatible_types(&s1->type, &s2->type))
2152 return 0;
2153 /* check func_call */
2154 if (FUNC_CALL(s1->r) != FUNC_CALL(s2->r))
2155 return 0;
2156 /* XXX: not complete */
2157 if (s1->c == FUNC_OLD || s2->c == FUNC_OLD)
2158 return 1;
2159 if (s1->c != s2->c)
2160 return 0;
2161 while (s1 != NULL) {
2162 if (s2 == NULL)
2163 return 0;
2164 if (!is_compatible_parameter_types(&s1->type, &s2->type))
2165 return 0;
2166 s1 = s1->next;
2167 s2 = s2->next;
2168 }
2169 if (s2)
2170 return 0;
2171 return 1;
2172 }
2173
2174 /* return true if type1 and type2 are the same. If unqualified is
2175 true, qualifiers on the types are ignored.
2176
2177 - enums are not checked as gcc __builtin_types_compatible_p ()
2178 */
2179 static int compare_types(CType *type1, CType *type2, int unqualified)
2180 {
2181 int bt1, t1, t2;
2182
2183 t1 = type1->t & VT_TYPE;
2184 t2 = type2->t & VT_TYPE;
2185 if (unqualified) {
2186 /* strip qualifiers before comparing */
2187 t1 &= ~(VT_CONSTANT | VT_VOLATILE);
2188 t2 &= ~(VT_CONSTANT | VT_VOLATILE);
2189 }
2190 /* XXX: bitfields ? */
2191 if (t1 != t2)
2192 return 0;
2193 /* test more complicated cases */
2194 bt1 = t1 & VT_BTYPE;
2195 if (bt1 == VT_PTR) {
2196 type1 = pointed_type(type1);
2197 type2 = pointed_type(type2);
2198 return is_compatible_types(type1, type2);
2199 } else if (bt1 == VT_STRUCT) {
2200 return (type1->ref == type2->ref);
2201 } else if (bt1 == VT_FUNC) {
2202 return is_compatible_func(type1, type2);
2203 } else {
2204 return 1;
2205 }
2206 }
2207
2208 /* return true if type1 and type2 are exactly the same (including
2209 qualifiers).
2210 */
2211 static int is_compatible_types(CType *type1, CType *type2)
2212 {
2213 return compare_types(type1,type2,0);
2214 }
2215
2216 /* return true if type1 and type2 are the same (ignoring qualifiers).
2217 */
2218 static int is_compatible_parameter_types(CType *type1, CType *type2)
2219 {
2220 return compare_types(type1,type2,1);
2221 }
2222
2223 /* print a type. If 'varstr' is not NULL, then the variable is also
2224 printed in the type */
2225 /* XXX: union */
2226 /* XXX: add array and function pointers */
2227 static void type_to_str(char *buf, int buf_size,
2228 CType *type, const char *varstr)
2229 {
2230 int bt, v, t;
2231 Sym *s, *sa;
2232 char buf1[256];
2233 const char *tstr;
2234
2235 t = type->t & VT_TYPE;
2236 bt = t & VT_BTYPE;
2237 buf[0] = '\0';
2238 if (t & VT_CONSTANT)
2239 pstrcat(buf, buf_size, "const ");
2240 if (t & VT_VOLATILE)
2241 pstrcat(buf, buf_size, "volatile ");
2242 if (t & VT_UNSIGNED)
2243 pstrcat(buf, buf_size, "unsigned ");
2244 switch(bt) {
2245 case VT_VOID:
2246 tstr = "void";
2247 goto add_tstr;
2248 case VT_BOOL:
2249 tstr = "_Bool";
2250 goto add_tstr;
2251 case VT_BYTE:
2252 tstr = "char";
2253 goto add_tstr;
2254 case VT_SHORT:
2255 tstr = "short";
2256 goto add_tstr;
2257 case VT_INT:
2258 tstr = "int";
2259 goto add_tstr;
2260 case VT_LONG:
2261 tstr = "long";
2262 goto add_tstr;
2263 case VT_LLONG:
2264 tstr = "long long";
2265 goto add_tstr;
2266 case VT_FLOAT:
2267 tstr = "float";
2268 goto add_tstr;
2269 case VT_DOUBLE:
2270 tstr = "double";
2271 goto add_tstr;
2272 case VT_LDOUBLE:
2273 tstr = "long double";
2274 add_tstr:
2275 pstrcat(buf, buf_size, tstr);
2276 break;
2277 case VT_ENUM:
2278 case VT_STRUCT:
2279 if (bt == VT_STRUCT)
2280 tstr = "struct ";
2281 else
2282 tstr = "enum ";
2283 pstrcat(buf, buf_size, tstr);
2284 v = type->ref->v & ~SYM_STRUCT;
2285 if (v >= SYM_FIRST_ANOM)
2286 pstrcat(buf, buf_size, "<anonymous>");
2287 else
2288 pstrcat(buf, buf_size, get_tok_str(v, NULL));
2289 break;
2290 case VT_FUNC:
2291 s = type->ref;
2292 type_to_str(buf, buf_size, &s->type, varstr);
2293 pstrcat(buf, buf_size, "(");
2294 sa = s->next;
2295 while (sa != NULL) {
2296 type_to_str(buf1, sizeof(buf1), &sa->type, NULL);
2297 pstrcat(buf, buf_size, buf1);
2298 sa = sa->next;
2299 if (sa)
2300 pstrcat(buf, buf_size, ", ");
2301 }
2302 pstrcat(buf, buf_size, ")");
2303 goto no_var;
2304 case VT_PTR:
2305 s = type->ref;
2306 pstrcpy(buf1, sizeof(buf1), "*");
2307 if (varstr)
2308 pstrcat(buf1, sizeof(buf1), varstr);
2309 type_to_str(buf, buf_size, &s->type, buf1);
2310 goto no_var;
2311 }
2312 if (varstr) {
2313 pstrcat(buf, buf_size, " ");
2314 pstrcat(buf, buf_size, varstr);
2315 }
2316 no_var: ;
2317 }
2318
2319 /* verify type compatibility to store vtop in 'dt' type, and generate
2320 casts if needed. */
2321 static void gen_assign_cast(CType *dt)
2322 {
2323 CType *st, *type1, *type2, tmp_type1, tmp_type2;
2324 char buf1[256], buf2[256];
2325 int dbt, sbt;
2326
2327 st = &vtop->type; /* source type */
2328 dbt = dt->t & VT_BTYPE;
2329 sbt = st->t & VT_BTYPE;
2330 if (sbt == VT_VOID)
2331 tcc_error("Cannot assign void value");
2332 if (dt->t & VT_CONSTANT)
2333 tcc_warning("assignment of read-only location");
2334 switch(dbt) {
2335 case VT_PTR:
2336 /* special cases for pointers */
2337 /* '0' can also be a pointer */
2338 if (is_null_pointer(vtop))
2339 goto type_ok;
2340 /* accept implicit pointer to integer cast with warning */
2341 if (is_integer_btype(sbt)) {
2342 tcc_warning("assignment makes pointer from integer without a cast");
2343 goto type_ok;
2344 }
2345 type1 = pointed_type(dt);
2346 /* a function is implicitely a function pointer */
2347 if (sbt == VT_FUNC) {
2348 if ((type1->t & VT_BTYPE) != VT_VOID &&
2349 !is_compatible_types(pointed_type(dt), st))
2350 tcc_warning("assignment from incompatible pointer type");
2351 goto type_ok;
2352 }
2353 if (sbt != VT_PTR)
2354 goto error;
2355 type2 = pointed_type(st);
2356 if ((type1->t & VT_BTYPE) == VT_VOID ||
2357 (type2->t & VT_BTYPE) == VT_VOID) {
2358 /* void * can match anything */
2359 } else {
2360 /* exact type match, except for unsigned */
2361 tmp_type1 = *type1;
2362 tmp_type2 = *type2;
2363 tmp_type1.t &= ~(VT_UNSIGNED | VT_CONSTANT | VT_VOLATILE);
2364 tmp_type2.t &= ~(VT_UNSIGNED | VT_CONSTANT | VT_VOLATILE);
2365 if (!is_compatible_types(&tmp_type1, &tmp_type2))
2366 tcc_warning("assignment from incompatible pointer type");
2367 }
2368 /* check const and volatile */
2369 if ((!(type1->t & VT_CONSTANT) && (type2->t & VT_CONSTANT)) ||
2370 (!(type1->t & VT_VOLATILE) && (type2->t & VT_VOLATILE)))
2371 tcc_warning("assignment discards qualifiers from pointer target type");
2372 break;
2373 case VT_BYTE:
2374 case VT_SHORT:
2375 case VT_INT:
2376 case VT_LLONG:
2377 if (sbt == VT_PTR || sbt == VT_FUNC) {
2378 tcc_warning("assignment makes integer from pointer without a cast");
2379 }
2380 /* XXX: more tests */
2381 break;
2382 case VT_STRUCT:
2383 tmp_type1 = *dt;
2384 tmp_type2 = *st;
2385 tmp_type1.t &= ~(VT_CONSTANT | VT_VOLATILE);
2386 tmp_type2.t &= ~(VT_CONSTANT | VT_VOLATILE);
2387 if (!is_compatible_types(&tmp_type1, &tmp_type2)) {
2388 error:
2389 type_to_str(buf1, sizeof(buf1), st, NULL);
2390 type_to_str(buf2, sizeof(buf2), dt, NULL);
2391 tcc_error("cannot cast '%s' to '%s'", buf1, buf2);
2392 }
2393 break;
2394 }
2395 type_ok:
2396 gen_cast(dt);
2397 }
2398
2399 /* store vtop in lvalue pushed on stack */
2400 ST_FUNC void vstore(void)
2401 {
2402 int sbt, dbt, ft, r, t, size, align, bit_size, bit_pos, rc, delayed_cast;
2403
2404 ft = vtop[-1].type.t;
2405 sbt = vtop->type.t & VT_BTYPE;
2406 dbt = ft & VT_BTYPE;
2407 if ((((sbt == VT_INT || sbt == VT_SHORT) && dbt == VT_BYTE) ||
2408 (sbt == VT_INT && dbt == VT_SHORT))
2409 && !(vtop->type.t & VT_BITFIELD)) {
2410 /* optimize char/short casts */
2411 delayed_cast = VT_MUSTCAST;
2412 vtop->type.t = ft & (VT_TYPE & ~(VT_BITFIELD | (-1 << VT_STRUCT_SHIFT)));
2413 /* XXX: factorize */
2414 if (ft & VT_CONSTANT)
2415 tcc_warning("assignment of read-only location");
2416 } else {
2417 delayed_cast = 0;
2418 if (!(ft & VT_BITFIELD))
2419 gen_assign_cast(&vtop[-1].type);
2420 }
2421
2422 if (sbt == VT_STRUCT) {
2423 /* if structure, only generate pointer */
2424 /* structure assignment : generate memcpy */
2425 /* XXX: optimize if small size */
2426 if (!nocode_wanted) {
2427 size = type_size(&vtop->type, &align);
2428
2429 /* destination */
2430 vswap();
2431 vtop->type.t = VT_PTR;
2432 gaddrof();
2433
2434 /* address of memcpy() */
2435 #ifdef TCC_ARM_EABI
2436 if(!(align & 7))
2437 vpush_global_sym(&func_old_type, TOK_memcpy8);
2438 else if(!(align & 3))
2439 vpush_global_sym(&func_old_type, TOK_memcpy4);
2440 else
2441 #endif
2442 vpush_global_sym(&func_old_type, TOK_memcpy);
2443
2444 vswap();
2445 /* source */
2446 vpushv(vtop - 2);
2447 vtop->type.t = VT_PTR;
2448 gaddrof();
2449 /* type size */
2450 vpushi(size);
2451 gfunc_call(3);
2452 } else {
2453 vswap();
2454 vpop();
2455 }
2456 /* leave source on stack */
2457 } else if (ft & VT_BITFIELD) {
2458 /* bitfield store handling */
2459 bit_pos = (ft >> VT_STRUCT_SHIFT) & 0x3f;
2460 bit_size = (ft >> (VT_STRUCT_SHIFT + 6)) & 0x3f;
2461 /* remove bit field info to avoid loops */
2462 vtop[-1].type.t = ft & ~(VT_BITFIELD | (-1 << VT_STRUCT_SHIFT));
2463
2464 /* duplicate source into other register */
2465 gv_dup();
2466 vswap();
2467 vrott(3);
2468
2469 if((ft & VT_BTYPE) == VT_BOOL) {
2470 gen_cast(&vtop[-1].type);
2471 vtop[-1].type.t = (vtop[-1].type.t & ~VT_BTYPE) | (VT_BYTE | VT_UNSIGNED);
2472 }
2473
2474 /* duplicate destination */
2475 vdup();
2476 vtop[-1] = vtop[-2];
2477
2478 /* mask and shift source */
2479 if((ft & VT_BTYPE) != VT_BOOL) {
2480 if((ft & VT_BTYPE) == VT_LLONG) {
2481 vpushll((1ULL << bit_size) - 1ULL);
2482 } else {
2483 vpushi((1 << bit_size) - 1);
2484 }
2485 gen_op('&');
2486 }
2487 vpushi(bit_pos);
2488 gen_op(TOK_SHL);
2489 /* load destination, mask and or with source */
2490 vswap();
2491 if((ft & VT_BTYPE) == VT_LLONG) {
2492 vpushll(~(((1ULL << bit_size) - 1ULL) << bit_pos));
2493 } else {
2494 vpushi(~(((1 << bit_size) - 1) << bit_pos));
2495 }
2496 gen_op('&');
2497 gen_op('|');
2498 /* store result */
2499 vstore();
2500
2501 /* pop off shifted source from "duplicate source..." above */
2502 vpop();
2503
2504 } else {
2505 #ifdef CONFIG_TCC_BCHECK
2506 /* bound check case */
2507 if (vtop[-1].r & VT_MUSTBOUND) {
2508 vswap();
2509 gbound();
2510 vswap();
2511 }
2512 #endif
2513 if (!nocode_wanted) {
2514 rc = RC_INT;
2515 if (is_float(ft)) {
2516 rc = RC_FLOAT;
2517 #ifdef TCC_TARGET_X86_64
2518 if ((ft & VT_BTYPE) == VT_LDOUBLE) {
2519 rc = RC_ST0;
2520 } else if ((ft & VT_BTYPE) == VT_QFLOAT) {
2521 rc = RC_FRET;
2522 }
2523 #endif
2524 }
2525 r = gv(rc); /* generate value */
2526 /* if lvalue was saved on stack, must read it */
2527 if ((vtop[-1].r & VT_VALMASK) == VT_LLOCAL) {
2528 SValue sv;
2529 t = get_reg(RC_INT);
2530 #ifdef TCC_TARGET_X86_64
2531 sv.type.t = VT_PTR;
2532 #else
2533 sv.type.t = VT_INT;
2534 #endif
2535 sv.r = VT_LOCAL | VT_LVAL;
2536 sv.c.ul = vtop[-1].c.ul;
2537 load(t, &sv);
2538 vtop[-1].r = t | VT_LVAL;
2539 }
2540 /* two word case handling : store second register at word + 4 (or +8 for x86-64) */
2541 #ifdef TCC_TARGET_X86_64
2542 if (((ft & VT_BTYPE) == VT_QLONG) || ((ft & VT_BTYPE) == VT_QFLOAT)) {
2543 int addr_type = VT_LLONG, load_size = 8, load_type = ((vtop->type.t & VT_BTYPE) == VT_QLONG) ? VT_LLONG : VT_DOUBLE;
2544 #else
2545 if ((ft & VT_BTYPE) == VT_LLONG) {
2546 int addr_type = VT_INT, load_size = 4, load_type = VT_INT;
2547 #endif
2548 vtop[-1].type.t = load_type;
2549 store(r, vtop - 1);
2550 vswap();
2551 /* convert to int to increment easily */
2552 vtop->type.t = addr_type;
2553 gaddrof();
2554 vpushi(load_size);
2555 gen_op('+');
2556 vtop->r |= VT_LVAL;
2557 vswap();
2558 vtop[-1].type.t = load_type;
2559 /* XXX: it works because r2 is spilled last ! */
2560 store(vtop->r2, vtop - 1);
2561 } else {
2562 store(r, vtop - 1);
2563 }
2564 }
2565 vswap();
2566 vtop--; /* NOT vpop() because on x86 it would flush the fp stack */
2567 vtop->r |= delayed_cast;
2568 }
2569 }
2570
2571 /* post defines POST/PRE add. c is the token ++ or -- */
2572 ST_FUNC void inc(int post, int c)
2573 {
2574 test_lvalue();
2575 vdup(); /* save lvalue */
2576 if (post) {
2577 gv_dup(); /* duplicate value */
2578 vrotb(3);
2579 vrotb(3);
2580 }
2581 /* add constant */
2582 vpushi(c - TOK_MID);
2583 gen_op('+');
2584 vstore(); /* store value */
2585 if (post)
2586 vpop(); /* if post op, return saved value */
2587 }
2588
2589 /* Parse GNUC __attribute__ extension. Currently, the following
2590 extensions are recognized:
2591 - aligned(n) : set data/function alignment.
2592 - packed : force data alignment to 1
2593 - section(x) : generate data/code in this section.
2594 - unused : currently ignored, but may be used someday.
2595 - regparm(n) : pass function parameters in registers (i386 only)
2596 */
2597 static void parse_attribute(AttributeDef *ad)
2598 {
2599 int t, n;
2600
2601 while (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2) {
2602 next();
2603 skip('(');
2604 skip('(');
2605 while (tok != ')') {
2606 if (tok < TOK_IDENT)
2607 expect("attribute name");
2608 t = tok;
2609 next();
2610 switch(t) {
2611 case TOK_SECTION1:
2612 case TOK_SECTION2:
2613 skip('(');
2614 if (tok != TOK_STR)
2615 expect("section name");
2616 ad->section = find_section(tcc_state, (char *)tokc.cstr->data);
2617 next();
2618 skip(')');
2619 break;
2620 case TOK_ALIAS1:
2621 case TOK_ALIAS2:
2622 skip('(');
2623 if (tok != TOK_STR)
2624 expect("alias(\"target\")");
2625 ad->alias_target = /* save string as token, for later */
2626 tok_alloc((char*)tokc.cstr->data, tokc.cstr->size-1)->tok;
2627 next();
2628 skip(')');
2629 break;
2630 case TOK_ALIGNED1:
2631 case TOK_ALIGNED2:
2632 if (tok == '(') {
2633 next();
2634 n = expr_const();
2635 if (n <= 0 || (n & (n - 1)) != 0)
2636 tcc_error("alignment must be a positive power of two");
2637 skip(')');
2638 } else {
2639 n = MAX_ALIGN;
2640 }
2641 ad->aligned = n;
2642 break;
2643 case TOK_PACKED1:
2644 case TOK_PACKED2:
2645 ad->packed = 1;
2646 break;
2647 case TOK_WEAK1:
2648 case TOK_WEAK2:
2649 ad->weak = 1;
2650 break;
2651 case TOK_UNUSED1:
2652 case TOK_UNUSED2:
2653 /* currently, no need to handle it because tcc does not
2654 track unused objects */
2655 break;
2656 case TOK_NORETURN1:
2657 case TOK_NORETURN2:
2658 /* currently, no need to handle it because tcc does not
2659 track unused objects */
2660 break;
2661 case TOK_CDECL1:
2662 case TOK_CDECL2:
2663 case TOK_CDECL3:
2664 ad->func_call = FUNC_CDECL;
2665 break;
2666 case TOK_STDCALL1:
2667 case TOK_STDCALL2:
2668 case TOK_STDCALL3:
2669 ad->func_call = FUNC_STDCALL;
2670 break;
2671 #ifdef TCC_TARGET_I386
2672 case TOK_REGPARM1:
2673 case TOK_REGPARM2:
2674 skip('(');
2675 n = expr_const();
2676 if (n > 3)
2677 n = 3;
2678 else if (n < 0)
2679 n = 0;
2680 if (n > 0)
2681 ad->func_call = FUNC_FASTCALL1 + n - 1;
2682 skip(')');
2683 break;
2684 case TOK_FASTCALL1:
2685 case TOK_FASTCALL2:
2686 case TOK_FASTCALL3:
2687 ad->func_call = FUNC_FASTCALLW;
2688 break;
2689 #endif
2690 case TOK_MODE:
2691 skip('(');
2692 switch(tok) {
2693 case TOK_MODE_DI:
2694 ad->mode = VT_LLONG + 1;
2695 break;
2696 case TOK_MODE_HI:
2697 ad->mode = VT_SHORT + 1;
2698 break;
2699 case TOK_MODE_SI:
2700 ad->mode = VT_INT + 1;
2701 break;
2702 default:
2703 tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok, NULL));
2704 break;
2705 }
2706 next();
2707 skip(')');
2708 break;
2709 case TOK_DLLEXPORT:
2710 ad->func_export = 1;
2711 break;
2712 case TOK_DLLIMPORT:
2713 ad->func_import = 1;
2714 break;
2715 default:
2716 if (tcc_state->warn_unsupported)
2717 tcc_warning("'%s' attribute ignored", get_tok_str(t, NULL));
2718 /* skip parameters */
2719 if (tok == '(') {
2720 int parenthesis = 0;
2721 do {
2722 if (tok == '(')
2723 parenthesis++;
2724 else if (tok == ')')
2725 parenthesis--;
2726 next();
2727 } while (parenthesis && tok != -1);
2728 }
2729 break;
2730 }
2731 if (tok != ',')
2732 break;
2733 next();
2734 }
2735 skip(')');
2736 skip(')');
2737 }
2738 }
2739
2740 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
2741 static void struct_decl(CType *type, int u)
2742 {
2743 int a, v, size, align, maxalign, c, offset;
2744 int bit_size, bit_pos, bsize, bt, lbit_pos, prevbt;
2745 Sym *s, *ss, *ass, **ps;
2746 AttributeDef ad;
2747 CType type1, btype;
2748
2749 a = tok; /* save decl type */
2750 next();
2751 if (tok != '{') {
2752 v = tok;
2753 next();
2754 /* struct already defined ? return it */
2755 if (v < TOK_IDENT)
2756 expect("struct/union/enum name");
2757 s = struct_find(v);
2758 if (s) {
2759 if (s->type.t != a)
2760 tcc_error("invalid type");
2761 goto do_decl;
2762 }
2763 } else {
2764 v = anon_sym++;
2765 }
2766 type1.t = a;
2767 type1.ref = NULL;
2768 /* we put an undefined size for struct/union */
2769 s = sym_push(v | SYM_STRUCT, &type1, 0, -1);
2770 s->r = 0; /* default alignment is zero as gcc */
2771 /* put struct/union/enum name in type */
2772 do_decl:
2773 type->t = u;
2774 type->ref = s;
2775
2776 if (tok == '{') {
2777 next();
2778 if (s->c != -1)
2779 tcc_error("struct/union/enum already defined");
2780 /* cannot be empty */
2781 c = 0;
2782 /* non empty enums are not allowed */
2783 if (a == TOK_ENUM) {
2784 for(;;) {
2785 v = tok;
2786 if (v < TOK_UIDENT)
2787 expect("identifier");
2788 next();
2789 if (tok == '=') {
2790 next();
2791 c = expr_const();
2792 }
2793 /* enum symbols have static storage */
2794 ss = sym_push(v, &int_type, VT_CONST, c);
2795 ss->type.t |= VT_STATIC;
2796 if (tok != ',')
2797 break;
2798 next();
2799 c++;
2800 /* NOTE: we accept a trailing comma */
2801 if (tok == '}')
2802 break;
2803 }
2804 skip('}');
2805 } else {
2806 maxalign = 1;
2807 ps = &s->next;
2808 prevbt = VT_INT;
2809 bit_pos = 0;
2810 offset = 0;
2811 while (tok != '}') {
2812 parse_btype(&btype, &ad);
2813 while (1) {
2814 bit_size = -1;
2815 v = 0;
2816 type1 = btype;
2817 if (tok != ':') {
2818 type_decl(&type1, &ad, &v, TYPE_DIRECT | TYPE_ABSTRACT);
2819 if (v == 0 && (type1.t & VT_BTYPE) != VT_STRUCT)
2820 expect("identifier");
2821 if ((type1.t & VT_BTYPE) == VT_FUNC ||
2822 (type1.t & (VT_TYPEDEF | VT_STATIC | VT_EXTERN | VT_INLINE)))
2823 tcc_error("invalid type for '%s'",
2824 get_tok_str(v, NULL));
2825 }
2826 if (tok == ':') {
2827 next();
2828 bit_size = expr_const();
2829 /* XXX: handle v = 0 case for messages */
2830 if (bit_size < 0)
2831 tcc_error("negative width in bit-field '%s'",
2832 get_tok_str(v, NULL));
2833 if (v && bit_size == 0)
2834 tcc_error("zero width for bit-field '%s'",
2835 get_tok_str(v, NULL));
2836 }
2837 size = type_size(&type1, &align);
2838 if (ad.aligned) {
2839 if (align < ad.aligned)
2840 align = ad.aligned;
2841 } else if (ad.packed) {
2842 align = 1;
2843 } else if (*tcc_state->pack_stack_ptr) {
2844 if (align > *tcc_state->pack_stack_ptr)
2845 align = *tcc_state->pack_stack_ptr;
2846 }
2847 lbit_pos = 0;
2848 if (bit_size >= 0) {
2849 bt = type1.t & VT_BTYPE;
2850 if (bt != VT_INT &&
2851 bt != VT_BYTE &&
2852 bt != VT_SHORT &&
2853 bt != VT_BOOL &&
2854 bt != VT_ENUM &&
2855 bt != VT_LLONG)
2856 tcc_error("bitfields must have scalar type");
2857 bsize = size * 8;
2858 if (bit_size > bsize) {
2859 tcc_error("width of '%s' exceeds its type",
2860 get_tok_str(v, NULL));
2861 } else if (bit_size == bsize) {
2862 /* no need for bit fields */
2863 bit_pos = 0;
2864 } else if (bit_size == 0) {
2865 /* XXX: what to do if only padding in a
2866 structure ? */
2867 /* zero size: means to pad */
2868 bit_pos = 0;
2869 } else {
2870 /* we do not have enough room ?
2871 did the type change?
2872 is it a union? */
2873 if ((bit_pos + bit_size) > bsize ||
2874 bt != prevbt || a == TOK_UNION)
2875 bit_pos = 0;
2876 lbit_pos = bit_pos;
2877 /* XXX: handle LSB first */
2878 type1.t |= VT_BITFIELD |
2879 (bit_pos << VT_STRUCT_SHIFT) |
2880 (bit_size << (VT_STRUCT_SHIFT + 6));
2881 bit_pos += bit_size;
2882 }
2883 prevbt = bt;
2884 } else {
2885 bit_pos = 0;
2886 }
2887 if (v != 0 || (type1.t & VT_BTYPE) == VT_STRUCT) {
2888 /* add new memory data only if starting
2889 bit field */
2890 if (lbit_pos == 0) {
2891 if (a == TOK_STRUCT) {
2892 c = (c + align - 1) & -align;
2893 offset = c;
2894 if (size > 0)
2895 c += size;
2896 } else {
2897 offset = 0;
2898 if (size > c)
2899 c = size;
2900 }
2901 if (align > maxalign)
2902 maxalign = align;
2903 }
2904 #if 0
2905 printf("add field %s offset=%d",
2906 get_tok_str(v, NULL), offset);
2907 if (type1.t & VT_BITFIELD) {
2908 printf(" pos=%d size=%d",
2909 (type1.t >> VT_STRUCT_SHIFT) & 0x3f,
2910 (type1.t >> (VT_STRUCT_SHIFT + 6)) & 0x3f);
2911 }
2912 printf("\n");
2913 #endif
2914 }
2915 if (v == 0 && (type1.t & VT_BTYPE) == VT_STRUCT) {
2916 ass = type1.ref;
2917 while ((ass = ass->next) != NULL) {
2918 ss = sym_push(ass->v, &ass->type, 0, offset + ass->c);
2919 *ps = ss;
2920 ps = &ss->next;
2921 }
2922 } else if (v) {
2923 ss = sym_push(v | SYM_FIELD, &type1, 0, offset);
2924 *ps = ss;
2925 ps = &ss->next;
2926 }
2927 if (tok == ';' || tok == TOK_EOF)
2928 break;
2929 skip(',');
2930 }
2931 skip(';');
2932 }
2933 skip('}');
2934 /* store size and alignment */
2935 s->c = (c + maxalign - 1) & -maxalign;
2936 s->r = maxalign;
2937 }
2938 }
2939 }
2940
2941 /* return 0 if no type declaration. otherwise, return the basic type
2942 and skip it.
2943 */
2944 static int parse_btype(CType *type, AttributeDef *ad)
2945 {
2946 int t, u, type_found, typespec_found, typedef_found;
2947 Sym *s;
2948 CType type1;
2949
2950 memset(ad, 0, sizeof(AttributeDef));
2951 type_found = 0;
2952 typespec_found = 0;
2953 typedef_found = 0;
2954 t = 0;
2955 while(1) {
2956 switch(tok) {
2957 case TOK_EXTENSION:
2958 /* currently, we really ignore extension */
2959 next();
2960 continue;
2961
2962 /* basic types */
2963 case TOK_CHAR:
2964 u = VT_BYTE;
2965 basic_type:
2966 next();
2967 basic_type1:
2968 if ((t & VT_BTYPE) != 0)
2969 tcc_error("too many basic types");
2970 t |= u;
2971 typespec_found = 1;
2972 break;
2973 case TOK_VOID:
2974 u = VT_VOID;
2975 goto basic_type;
2976 case TOK_SHORT:
2977 u = VT_SHORT;
2978 goto basic_type;
2979 case TOK_INT:
2980 next();
2981 typespec_found = 1;
2982 break;
2983 case TOK_LONG:
2984 next();
2985 if ((t & VT_BTYPE) == VT_DOUBLE) {
2986 #ifndef TCC_TARGET_PE
2987 t = (t & ~VT_BTYPE) | VT_LDOUBLE;
2988 #endif
2989 } else if ((t & VT_BTYPE) == VT_LONG) {
2990 t = (t & ~VT_BTYPE) | VT_LLONG;
2991 } else {
2992 u = VT_LONG;
2993 goto basic_type1;
2994 }
2995 break;
2996 case TOK_BOOL:
2997 u = VT_BOOL;
2998 goto basic_type;
2999 case TOK_FLOAT:
3000 u = VT_FLOAT;
3001 goto basic_type;
3002 case TOK_DOUBLE:
3003 next();
3004 if ((t & VT_BTYPE) == VT_LONG) {
3005 #ifdef TCC_TARGET_PE
3006 t = (t & ~VT_BTYPE) | VT_DOUBLE;
3007 #else
3008 t = (t & ~VT_BTYPE) | VT_LDOUBLE;
3009 #endif
3010 } else {
3011 u = VT_DOUBLE;
3012 goto basic_type1;
3013 }
3014 break;
3015 case TOK_ENUM:
3016 struct_decl(&type1, VT_ENUM);
3017 basic_type2:
3018 u = type1.t;
3019 type->ref = type1.ref;
3020 goto basic_type1;
3021 case TOK_STRUCT:
3022 case TOK_UNION:
3023 struct_decl(&type1, VT_STRUCT);
3024 goto basic_type2;
3025
3026 /* type modifiers */
3027 case TOK_CONST1:
3028 case TOK_CONST2:
3029 case TOK_CONST3:
3030 t |= VT_CONSTANT;
3031 next();
3032 break;
3033 case TOK_VOLATILE1:
3034 case TOK_VOLATILE2:
3035 case TOK_VOLATILE3:
3036 t |= VT_VOLATILE;
3037 next();
3038 break;
3039 case TOK_SIGNED1:
3040 case TOK_SIGNED2:
3041 case TOK_SIGNED3:
3042 typespec_found = 1;
3043 t |= VT_SIGNED;
3044 next();
3045 break;
3046 case TOK_REGISTER:
3047 case TOK_AUTO:
3048 case TOK_RESTRICT1:
3049 case TOK_RESTRICT2:
3050 case TOK_RESTRICT3:
3051 next();
3052 break;
3053 case TOK_UNSIGNED:
3054 t |= VT_UNSIGNED;
3055 next();
3056 typespec_found = 1;
3057 break;
3058
3059 /* storage */
3060 case TOK_EXTERN:
3061 t |= VT_EXTERN;
3062 next();
3063 break;
3064 case TOK_STATIC:
3065 t |= VT_STATIC;
3066 next();
3067 break;
3068 case TOK_TYPEDEF:
3069 t |= VT_TYPEDEF;
3070 next();
3071 break;
3072 case TOK_INLINE1:
3073 case TOK_INLINE2:
3074 case TOK_INLINE3:
3075 t |= VT_INLINE;
3076 next();
3077 break;
3078
3079 /* GNUC attribute */
3080 case TOK_ATTRIBUTE1:
3081 case TOK_ATTRIBUTE2:
3082 parse_attribute(ad);
3083 if (ad->mode) {
3084 u = ad->mode -1;
3085 t = (t & ~VT_BTYPE) | u;
3086 }
3087 break;
3088 /* GNUC typeof */
3089 case TOK_TYPEOF1:
3090 case TOK_TYPEOF2:
3091 case TOK_TYPEOF3:
3092 next();
3093 parse_expr_type(&type1);
3094 /* remove all storage modifiers except typedef */
3095 type1.t &= ~(VT_STORAGE&~VT_TYPEDEF);
3096 goto basic_type2;
3097 default:
3098 if (typespec_found || typedef_found)
3099 goto the_end;
3100 s = sym_find(tok);
3101 if (!s || !(s->type.t & VT_TYPEDEF))
3102 goto the_end;
3103 typedef_found = 1;
3104 t |= (s->type.t & ~VT_TYPEDEF);
3105 type->ref = s->type.ref;
3106 if (s->r) {
3107 /* get attributes from typedef */
3108 if (0 == ad->aligned)
3109 ad->aligned = FUNC_ALIGN(s->r);
3110 if (0 == ad->func_call)
3111 ad->func_call = FUNC_CALL(s->r);
3112 ad->packed |= FUNC_PACKED(s->r);
3113 }
3114 next();
3115 typespec_found = 1;
3116 break;
3117 }
3118 type_found = 1;
3119 }
3120 the_end:
3121 if ((t & (VT_SIGNED|VT_UNSIGNED)) == (VT_SIGNED|VT_UNSIGNED))
3122 tcc_error("signed and unsigned modifier");
3123 if (tcc_state->char_is_unsigned) {
3124 if ((t & (VT_SIGNED|VT_UNSIGNED|VT_BTYPE)) == VT_BYTE)
3125 t |= VT_UNSIGNED;
3126 }
3127 t &= ~VT_SIGNED;
3128
3129 /* long is never used as type */
3130 if ((t & VT_BTYPE) == VT_LONG)
3131 #if !defined TCC_TARGET_X86_64 || defined TCC_TARGET_PE
3132 t = (t & ~VT_BTYPE) | VT_INT;
3133 #else
3134 t = (t & ~VT_BTYPE) | VT_LLONG;
3135 #endif
3136 type->t = t;
3137 return type_found;
3138 }
3139
3140 /* convert a function parameter type (array to pointer and function to
3141 function pointer) */
3142 static inline void convert_parameter_type(CType *pt)
3143 {
3144 /* remove const and volatile qualifiers (XXX: const could be used
3145 to indicate a const function parameter */
3146 pt->t &= ~(VT_CONSTANT | VT_VOLATILE);
3147 /* array must be transformed to pointer according to ANSI C */
3148 pt->t &= ~VT_ARRAY;
3149 if ((pt->t & VT_BTYPE) == VT_FUNC) {
3150 mk_pointer(pt);
3151 }
3152 }
3153
3154 ST_FUNC void parse_asm_str(CString *astr)
3155 {
3156 skip('(');
3157 /* read the string */
3158 if (tok != TOK_STR)
3159 expect("string constant");
3160 cstr_new(astr);
3161 while (tok == TOK_STR) {
3162 /* XXX: add \0 handling too ? */
3163 cstr_cat(astr, tokc.cstr->data);
3164 next();
3165 }
3166 cstr_ccat(astr, '\0');
3167 }
3168
3169 /* Parse an asm label and return the label
3170 * Don't forget to free the CString in the caller! */
3171 static void asm_label_instr(CString *astr)
3172 {
3173 next();
3174 parse_asm_str(astr);
3175 skip(')');
3176 #ifdef ASM_DEBUG
3177 printf("asm_alias: \"%s\"\n", (char *)astr->data);
3178 #endif
3179 }
3180
3181 static void post_type(CType *type, AttributeDef *ad)
3182 {
3183 int n, l, t1, arg_size, align;
3184 Sym **plast, *s, *first;
3185 AttributeDef ad1;
3186 CType pt;
3187
3188 if (tok == '(') {
3189 /* function declaration */
3190 next();
3191 l = 0;
3192 first = NULL;
3193 plast = &first;
3194 arg_size = 0;
3195 if (tok != ')') {
3196 for(;;) {
3197 /* read param name and compute offset */
3198 if (l != FUNC_OLD) {
3199 if (!parse_btype(&pt, &ad1)) {
3200 if (l) {
3201 tcc_error("invalid type");
3202 } else {
3203 l = FUNC_OLD;
3204 goto old_proto;
3205 }
3206 }
3207 l = FUNC_NEW;
3208 if ((pt.t & VT_BTYPE) == VT_VOID && tok == ')')
3209 break;
3210 type_decl(&pt, &ad1, &n, TYPE_DIRECT | TYPE_ABSTRACT);
3211 if ((pt.t & VT_BTYPE) == VT_VOID)
3212 tcc_error("parameter declared as void");
3213 arg_size += (type_size(&pt, &align) + PTR_SIZE - 1) / PTR_SIZE;
3214 } else {
3215 old_proto:
3216 n = tok;
3217 if (n < TOK_UIDENT)
3218 expect("identifier");
3219 pt.t = VT_INT;
3220 next();
3221 }
3222 convert_parameter_type(&pt);
3223 s = sym_push(n | SYM_FIELD, &pt, 0, 0);
3224 *plast = s;
3225 plast = &s->next;
3226 if (tok == ')')
3227 break;
3228 skip(',');
3229 if (l == FUNC_NEW && tok == TOK_DOTS) {
3230 l = FUNC_ELLIPSIS;
3231 next();
3232 break;
3233 }
3234 }
3235 }
3236 /* if no parameters, then old type prototype */
3237 if (l == 0)
3238 l = FUNC_OLD;
3239 skip(')');
3240 /* NOTE: const is ignored in returned type as it has a special
3241 meaning in gcc / C++ */
3242 type->t &= ~VT_CONSTANT;
3243 /* some ancient pre-K&R C allows a function to return an array
3244 and the array brackets to be put after the arguments, such
3245 that "int c()[]" means something like "int[] c()" */
3246 if (tok == '[') {
3247 next();
3248 skip(']'); /* only handle simple "[]" */
3249 type->t |= VT_PTR;
3250 }
3251 /* we push a anonymous symbol which will contain the function prototype */
3252 ad->func_args = arg_size;
3253 s = sym_push(SYM_FIELD, type, INT_ATTR(ad), l);
3254 s->next = first;
3255 type->t = VT_FUNC;
3256 type->ref = s;
3257 } else if (tok == '[') {
3258 /* array definition */
3259 next();
3260 if (tok == TOK_RESTRICT1)
3261 next();
3262 n = -1;
3263 t1 = 0;
3264 if (tok != ']') {
3265 if (!local_stack || nocode_wanted)
3266 vpushi(expr_const());
3267 else gexpr();
3268 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
3269 n = vtop->c.i;
3270 if (n < 0)
3271 tcc_error("invalid array size");
3272 } else {
3273 if (!is_integer_btype(vtop->type.t & VT_BTYPE))
3274 tcc_error("size of variable length array should be an integer");
3275 t1 = VT_VLA;
3276 }
3277 }
3278 skip(']');
3279 /* parse next post type */
3280 post_type(type, ad);
3281 t1 |= type->t & VT_VLA;
3282
3283 if (t1 & VT_VLA) {
3284 loc -= type_size(&int_type, &align);
3285 loc &= -align;
3286 n = loc;
3287
3288 vla_runtime_type_size(type, &align);
3289 gen_op('*');
3290 vset(&int_type, VT_LOCAL|VT_LVAL, loc);
3291 vswap();
3292 vstore();
3293 }
3294 if (n != -1)
3295 vpop();
3296
3297 /* we push an anonymous symbol which will contain the array
3298 element type */
3299 s = sym_push(SYM_FIELD, type, 0, n);
3300 type->t = (t1 ? VT_VLA : VT_ARRAY) | VT_PTR;
3301 type->ref = s;
3302 }
3303 }
3304
3305 /* Parse a type declaration (except basic type), and return the type
3306 in 'type'. 'td' is a bitmask indicating which kind of type decl is
3307 expected. 'type' should contain the basic type. 'ad' is the
3308 attribute definition of the basic type. It can be modified by
3309 type_decl().
3310 */
3311 static void type_decl(CType *type, AttributeDef *ad, int *v, int td)
3312 {
3313 Sym *s;
3314 CType type1, *type2;
3315 int qualifiers, storage;
3316
3317 while (tok == '*') {
3318 qualifiers = 0;
3319 redo:
3320 next();
3321 switch(tok) {
3322 case TOK_CONST1:
3323 case TOK_CONST2:
3324 case TOK_CONST3:
3325 qualifiers |= VT_CONSTANT;
3326 goto redo;
3327 case TOK_VOLATILE1:
3328 case TOK_VOLATILE2:
3329 case TOK_VOLATILE3:
3330 qualifiers |= VT_VOLATILE;
3331 goto redo;
3332 case TOK_RESTRICT1:
3333 case TOK_RESTRICT2:
3334 case TOK_RESTRICT3:
3335 goto redo;
3336 }
3337 mk_pointer(type);
3338 type->t |= qualifiers;
3339 }
3340
3341 /* XXX: clarify attribute handling */
3342 if (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2)
3343 parse_attribute(ad);
3344
3345 /* recursive type */
3346 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
3347 type1.t = 0; /* XXX: same as int */
3348 if (tok == '(') {
3349 next();
3350 /* XXX: this is not correct to modify 'ad' at this point, but
3351 the syntax is not clear */
3352 if (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2)
3353 parse_attribute(ad);
3354 type_decl(&type1, ad, v, td);
3355 skip(')');
3356 } else {
3357 /* type identifier */
3358 if (tok >= TOK_IDENT && (td & TYPE_DIRECT)) {
3359 *v = tok;
3360 next();
3361 } else {
3362 if (!(td & TYPE_ABSTRACT))
3363 expect("identifier");
3364 *v = 0;
3365 }
3366 }
3367 storage = type->t & VT_STORAGE;
3368 type->t &= ~VT_STORAGE;
3369 if (storage & VT_STATIC) {
3370 int saved_nocode_wanted = nocode_wanted;
3371 nocode_wanted = 1;
3372 post_type(type, ad);
3373 nocode_wanted = saved_nocode_wanted;
3374 } else
3375 post_type(type, ad);
3376 type->t |= storage;
3377 if (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2)
3378 parse_attribute(ad);
3379
3380 if (!type1.t)
3381 return;
3382 /* append type at the end of type1 */
3383 type2 = &type1;
3384 for(;;) {
3385 s = type2->ref;
3386 type2 = &s->type;
3387 if (!type2->t) {
3388 *type2 = *type;
3389 break;
3390 }
3391 }
3392 *type = type1;
3393 }
3394
3395 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
3396 ST_FUNC int lvalue_type(int t)
3397 {
3398 int bt, r;
3399 r = VT_LVAL;
3400 bt = t & VT_BTYPE;
3401 if (bt == VT_BYTE || bt == VT_BOOL)
3402 r |= VT_LVAL_BYTE;
3403 else if (bt == VT_SHORT)
3404 r |= VT_LVAL_SHORT;
3405 else
3406 return r;
3407 if (t & VT_UNSIGNED)
3408 r |= VT_LVAL_UNSIGNED;
3409 return r;
3410 }
3411
3412 /* indirection with full error checking and bound check */
3413 ST_FUNC void indir(void)
3414 {
3415 if ((vtop->type.t & VT_BTYPE) != VT_PTR) {
3416 if ((vtop->type.t & VT_BTYPE) == VT_FUNC)
3417 return;
3418 expect("pointer");
3419 }
3420 if ((vtop->r & VT_LVAL) && !nocode_wanted)
3421 gv(RC_INT);
3422 vtop->type = *pointed_type(&vtop->type);
3423 /* Arrays and functions are never lvalues */
3424 if (!(vtop->type.t & VT_ARRAY) && !(vtop->type.t & VT_VLA)
3425 && (vtop->type.t & VT_BTYPE) != VT_FUNC) {
3426 vtop->r |= lvalue_type(vtop->type.t);
3427 /* if bound checking, the referenced pointer must be checked */
3428 #ifdef CONFIG_TCC_BCHECK
3429 if (tcc_state->do_bounds_check)
3430 vtop->r |= VT_MUSTBOUND;
3431 #endif
3432 }
3433 }
3434
3435 /* pass a parameter to a function and do type checking and casting */
3436 static void gfunc_param_typed(Sym *func, Sym *arg)
3437 {
3438 int func_type;
3439 CType type;
3440
3441 func_type = func->c;
3442 if (func_type == FUNC_OLD ||
3443 (func_type == FUNC_ELLIPSIS && arg == NULL)) {
3444 /* default casting : only need to convert float to double */
3445 if ((vtop->type.t & VT_BTYPE) == VT_FLOAT) {
3446 type.t = VT_DOUBLE;
3447 gen_cast(&type);
3448 }
3449 } else if (arg == NULL) {
3450 tcc_error("too many arguments to function");
3451 } else {
3452 type = arg->type;
3453 type.t &= ~VT_CONSTANT; /* need to do that to avoid false warning */
3454 gen_assign_cast(&type);
3455 }
3456 }
3457
3458 /* parse an expression of the form '(type)' or '(expr)' and return its
3459 type */
3460 static void parse_expr_type(CType *type)
3461 {
3462 int n;
3463 AttributeDef ad;
3464
3465 skip('(');
3466 if (parse_btype(type, &ad)) {
3467 type_decl(type, &ad, &n, TYPE_ABSTRACT);
3468 } else {
3469 expr_type(type);
3470 }
3471 skip(')');
3472 }
3473
3474 static void parse_type(CType *type)
3475 {
3476 AttributeDef ad;
3477 int n;
3478
3479 if (!parse_btype(type, &ad)) {
3480 expect("type");
3481 }
3482 type_decl(type, &ad, &n, TYPE_ABSTRACT);
3483 }
3484
3485 static void vpush_tokc(int t)
3486 {
3487 CType type;
3488 type.t = t;
3489 type.ref = 0;
3490 vsetc(&type, VT_CONST, &tokc);
3491 }
3492
3493 ST_FUNC void unary(void)
3494 {
3495 int n, t, align, size, r, sizeof_caller;
3496 CType type;
3497 Sym *s;
3498 AttributeDef ad;
3499 static int in_sizeof = 0;
3500
3501 sizeof_caller = in_sizeof;
3502 in_sizeof = 0;
3503 /* XXX: GCC 2.95.3 does not generate a table although it should be
3504 better here */
3505 tok_next:
3506 switch(tok) {
3507 case TOK_EXTENSION:
3508 next();
3509 goto tok_next;
3510 case TOK_CINT:
3511 case TOK_CCHAR:
3512 case TOK_LCHAR:
3513 vpushi(tokc.i);
3514 next();
3515 break;
3516 case TOK_CUINT:
3517 vpush_tokc(VT_INT | VT_UNSIGNED);
3518 next();
3519 break;
3520 case TOK_CLLONG:
3521 vpush_tokc(VT_LLONG);
3522 next();
3523 break;
3524 case TOK_CULLONG:
3525 vpush_tokc(VT_LLONG | VT_UNSIGNED);
3526 next();
3527 break;
3528 case TOK_CFLOAT:
3529 vpush_tokc(VT_FLOAT);
3530 next();
3531 break;
3532 case TOK_CDOUBLE:
3533 vpush_tokc(VT_DOUBLE);
3534 next();
3535 break;
3536 case TOK_CLDOUBLE:
3537 vpush_tokc(VT_LDOUBLE);
3538 next();
3539 break;
3540 case TOK___FUNCTION__:
3541 if (!gnu_ext)
3542 goto tok_identifier;
3543 /* fall thru */
3544 case TOK___FUNC__:
3545 {
3546 void *ptr;
3547 int len;
3548 /* special function name identifier */
3549 len = strlen(funcname) + 1;
3550 /* generate char[len] type */
3551 type.t = VT_BYTE;
3552 mk_pointer(&type);
3553 type.t |= VT_ARRAY;
3554 type.ref->c = len;
3555 vpush_ref(&type, data_section, data_section->data_offset, len);
3556 ptr = section_ptr_add(data_section, len);
3557 memcpy(ptr, funcname, len);
3558 next();
3559 }
3560 break;
3561 case TOK_LSTR:
3562 #ifdef TCC_TARGET_PE
3563 t = VT_SHORT | VT_UNSIGNED;
3564 #else
3565 t = VT_INT;
3566 #endif
3567 goto str_init;
3568 case TOK_STR:
3569 /* string parsing */
3570 t = VT_BYTE;
3571 str_init:
3572 if (tcc_state->warn_write_strings)
3573 t |= VT_CONSTANT;
3574 type.t = t;
3575 mk_pointer(&type);
3576 type.t |= VT_ARRAY;
3577 memset(&ad, 0, sizeof(AttributeDef));
3578 decl_initializer_alloc(&type, &ad, VT_CONST, 2, 0, NULL, 0);
3579 break;
3580 case '(':
3581 next();
3582 /* cast ? */
3583 if (parse_btype(&type, &ad)) {
3584 type_decl(&type, &ad, &n, TYPE_ABSTRACT);
3585 skip(')');
3586 /* check ISOC99 compound literal */
3587 if (tok == '{') {
3588 /* data is allocated locally by default */
3589 if (global_expr)
3590 r = VT_CONST;
3591 else
3592 r = VT_LOCAL;
3593 /* all except arrays are lvalues */
3594 if (!(type.t & VT_ARRAY))
3595 r |= lvalue_type(type.t);
3596 memset(&ad, 0, sizeof(AttributeDef));
3597 decl_initializer_alloc(&type, &ad, r, 1, 0, NULL, 0);
3598 } else {
3599 if (sizeof_caller) {
3600 vpush(&type);
3601 return;
3602 }
3603 unary();
3604 gen_cast(&type);
3605 }
3606 } else if (tok == '{') {
3607 /* save all registers */
3608 save_regs(0);
3609 /* statement expression : we do not accept break/continue
3610 inside as GCC does */
3611 block(NULL, NULL, NULL, NULL, 0, 1);
3612 skip(')');
3613 } else {
3614 gexpr();
3615 skip(')');
3616 }
3617 break;
3618 case '*':
3619 next();
3620 unary();
3621 indir();
3622 break;
3623 case '&':
3624 next();
3625 unary();
3626 /* functions names must be treated as function pointers,
3627 except for unary '&' and sizeof. Since we consider that
3628 functions are not lvalues, we only have to handle it
3629 there and in function calls. */
3630 /* arrays can also be used although they are not lvalues */
3631 if ((vtop->type.t & VT_BTYPE) != VT_FUNC &&
3632 !(vtop->type.t & VT_ARRAY) && !(vtop->type.t & VT_LLOCAL))
3633 test_lvalue();
3634 mk_pointer(&vtop->type);
3635 gaddrof();
3636 break;
3637 case '!':
3638 next();
3639 unary();
3640 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
3641 CType boolean;
3642 boolean.t = VT_BOOL;
3643 gen_cast(&boolean);
3644 vtop->c.i = !vtop->c.i;
3645 } else if ((vtop->r & VT_VALMASK) == VT_CMP)
3646 vtop->c.i = vtop->c.i ^ 1;
3647 else {
3648 save_regs(1);
3649 vseti(VT_JMP, gtst(1, 0));
3650 }
3651 break;
3652 case '~':
3653 next();
3654 unary();
3655 vpushi(-1);
3656 gen_op('^');
3657 break;
3658 case '+':
3659 next();
3660 /* in order to force cast, we add zero */
3661 unary();
3662 if ((vtop->type.t & VT_BTYPE) == VT_PTR)
3663 tcc_error("pointer not accepted for unary plus");
3664 vpushi(0);
3665 gen_op('+');
3666 break;
3667 case TOK_SIZEOF:
3668 case TOK_ALIGNOF1:
3669 case TOK_ALIGNOF2:
3670 t = tok;
3671 next();
3672 in_sizeof++;
3673 unary_type(&type); // Perform a in_sizeof = 0;
3674 size = type_size(&type, &align);
3675 if (t == TOK_SIZEOF) {
3676 if (!(type.t & VT_VLA)) {
3677 if (size < 0)
3678 tcc_error("sizeof applied to an incomplete type");
3679 vpushs(size);
3680 } else {
3681 vla_runtime_type_size(&type, &align);
3682 }
3683 } else {
3684 vpushs(align);
3685 }
3686 vtop->type.t |= VT_UNSIGNED;
3687 break;
3688
3689 case TOK_builtin_types_compatible_p:
3690 {
3691 CType type1, type2;
3692 next();
3693 skip('(');
3694 parse_type(&type1);
3695 skip(',');
3696 parse_type(&type2);
3697 skip(')');
3698 type1.t &= ~(VT_CONSTANT | VT_VOLATILE);
3699 type2.t &= ~(VT_CONSTANT | VT_VOLATILE);
3700 vpushi(is_compatible_types(&type1, &type2));
3701 }
3702 break;
3703 case TOK_builtin_constant_p:
3704 {
3705 int saved_nocode_wanted, res;
3706 next();
3707 skip('(');
3708 saved_nocode_wanted = nocode_wanted;
3709 nocode_wanted = 1;
3710 gexpr();
3711 res = (vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
3712 vpop();
3713 nocode_wanted = saved_nocode_wanted;
3714 skip(')');
3715 vpushi(res);
3716 }
3717 break;
3718 case TOK_builtin_frame_address:
3719 {
3720 int level;
3721 CType type;
3722 next();
3723 skip('(');
3724 if (tok != TOK_CINT || tokc.i < 0) {
3725 tcc_error("__builtin_frame_address only takes positive integers");
3726 }
3727 level = tokc.i;
3728 next();
3729 skip(')');
3730 type.t = VT_VOID;
3731 mk_pointer(&type);
3732 vset(&type, VT_LOCAL, 0); /* local frame */
3733 while (level--) {
3734 mk_pointer(&vtop->type);
3735 indir(); /* -> parent frame */
3736 }
3737 }
3738 break;
3739 #ifdef TCC_TARGET_X86_64
3740 #ifdef TCC_TARGET_PE
3741 case TOK_builtin_va_start:
3742 {
3743 next();
3744 skip('(');
3745 expr_eq();
3746 skip(',');
3747 expr_eq();
3748 skip(')');
3749 if ((vtop->r & VT_VALMASK) != VT_LOCAL)
3750 tcc_error("__builtin_va_start expects a local variable");
3751 vtop->r &= ~(VT_LVAL | VT_REF);
3752 vtop->type = char_pointer_type;
3753 vstore();
3754 }
3755 break;
3756 #else
3757 case TOK_builtin_va_arg_types:
3758 {
3759 CType type;
3760 int bt;
3761 next();
3762 skip('(');
3763 parse_type(&type);
3764 skip(')');
3765 vpushi(classify_x86_64_va_arg(&type));
3766 }
3767 break;
3768 #endif
3769 #endif
3770 case TOK_INC:
3771 case TOK_DEC:
3772 t = tok;
3773 next();
3774 unary();
3775 inc(0, t);
3776 break;
3777 case '-':
3778 next();
3779 vpushi(0);
3780 unary();
3781 gen_op('-');
3782 break;
3783 case TOK_LAND:
3784 if (!gnu_ext)
3785 goto tok_identifier;
3786 next();
3787 /* allow to take the address of a label */
3788 if (tok < TOK_UIDENT)
3789 expect("label identifier");
3790 s = label_find(tok);
3791 if (!s) {
3792 s = label_push(&global_label_stack, tok, LABEL_FORWARD);
3793 } else {
3794 if (s->r == LABEL_DECLARED)
3795 s->r = LABEL_FORWARD;
3796 }
3797 if (!s->type.t) {
3798 s->type.t = VT_VOID;
3799 mk_pointer(&s->type);
3800 s->type.t |= VT_STATIC;
3801 }
3802 vset(&s->type, VT_CONST | VT_SYM, 0);
3803 vtop->sym = s;
3804 next();
3805 break;
3806
3807 // special qnan , snan and infinity values
3808 case TOK___NAN__:
3809 vpush64(VT_DOUBLE, 0x7ff8000000000000ULL);
3810 next();
3811 break;
3812 case TOK___SNAN__:
3813 vpush64(VT_DOUBLE, 0x7ff0000000000001ULL);
3814 next();
3815 break;
3816 case TOK___INF__:
3817 vpush64(VT_DOUBLE, 0x7ff0000000000000ULL);
3818 next();
3819 break;
3820
3821 default:
3822 tok_identifier:
3823 t = tok;
3824 next();
3825 if (t < TOK_UIDENT)
3826 expect("identifier");
3827 s = sym_find(t);
3828 if (!s) {
3829 if (tok != '(')
3830 tcc_error("'%s' undeclared", get_tok_str(t, NULL));
3831 /* for simple function calls, we tolerate undeclared
3832 external reference to int() function */
3833 if (tcc_state->warn_implicit_function_declaration)
3834 tcc_warning("implicit declaration of function '%s'",
3835 get_tok_str(t, NULL));
3836 s = external_global_sym(t, &func_old_type, 0);
3837 }
3838 if ((s->type.t & (VT_STATIC | VT_INLINE | VT_BTYPE)) ==
3839 (VT_STATIC | VT_INLINE | VT_FUNC)) {
3840 /* if referencing an inline function, then we generate a
3841 symbol to it if not already done. It will have the
3842 effect to generate code for it at the end of the
3843 compilation unit. Inline function as always
3844 generated in the text section. */
3845 if (!s->c)
3846 put_extern_sym(s, text_section, 0, 0);
3847 r = VT_SYM | VT_CONST;
3848 } else {
3849 r = s->r;
3850 }
3851 vset(&s->type, r, s->c);
3852 /* if forward reference, we must point to s */
3853 if (vtop->r & VT_SYM) {
3854 vtop->sym = s;
3855 vtop->c.ul = 0;
3856 }
3857 break;
3858 }
3859
3860 /* post operations */
3861 while (1) {
3862 if (tok == TOK_INC || tok == TOK_DEC) {
3863 inc(1, tok);
3864 next();
3865 } else if (tok == '.' || tok == TOK_ARROW) {
3866 int qualifiers;
3867 /* field */
3868 if (tok == TOK_ARROW)
3869 indir();
3870 qualifiers = vtop->type.t & (VT_CONSTANT | VT_VOLATILE);
3871 test_lvalue();
3872 gaddrof();
3873 next();
3874 /* expect pointer on structure */
3875 if ((vtop->type.t & VT_BTYPE) != VT_STRUCT)
3876 expect("struct or union");
3877 s = vtop->type.ref;
3878 /* find field */
3879 tok |= SYM_FIELD;
3880 while ((s = s->next) != NULL) {
3881 if (s->v == tok)
3882 break;
3883 }
3884 if (!s)
3885 tcc_error("field not found: %s", get_tok_str(tok & ~SYM_FIELD, NULL));
3886 /* add field offset to pointer */
3887 vtop->type = char_pointer_type; /* change type to 'char *' */
3888 vpushi(s->c);
3889 gen_op('+');
3890 /* change type to field type, and set to lvalue */
3891 vtop->type = s->type;
3892 vtop->type.t |= qualifiers;
3893 /* an array is never an lvalue */
3894 if (!(vtop->type.t & VT_ARRAY)) {
3895 vtop->r |= lvalue_type(vtop->type.t);
3896 #ifdef CONFIG_TCC_BCHECK
3897 /* if bound checking, the referenced pointer must be checked */
3898 if (tcc_state->do_bounds_check)
3899 vtop->r |= VT_MUSTBOUND;
3900 #endif
3901 }
3902 next();
3903 } else if (tok == '[') {
3904 next();
3905 gexpr();
3906 gen_op('+');
3907 indir();
3908 skip(']');
3909 } else if (tok == '(') {
3910 SValue ret;
3911 Sym *sa;
3912 int nb_args, sret;
3913
3914 /* function call */
3915 if ((vtop->type.t & VT_BTYPE) != VT_FUNC) {
3916 /* pointer test (no array accepted) */
3917 if ((vtop->type.t & (VT_BTYPE | VT_ARRAY)) == VT_PTR) {
3918 vtop->type = *pointed_type(&vtop->type);
3919 if ((vtop->type.t & VT_BTYPE) != VT_FUNC)
3920 goto error_func;
3921 } else {
3922 error_func:
3923 expect("function pointer");
3924 }
3925 } else {
3926 vtop->r &= ~VT_LVAL; /* no lvalue */
3927 }
3928 /* get return type */
3929 s = vtop->type.ref;
3930 next();
3931 sa = s->next; /* first parameter */
3932 nb_args = 0;
3933 ret.r2 = VT_CONST;
3934 /* compute first implicit argument if a structure is returned */
3935 if ((s->type.t & VT_BTYPE) == VT_STRUCT) {
3936 int ret_align;
3937 sret = gfunc_sret(&s->type, &ret.type, &ret_align);
3938 if (sret) {
3939 /* get some space for the returned structure */
3940 size = type_size(&s->type, &align);
3941 loc = (loc - size) & -align;
3942 ret.type = s->type;
3943 ret.r = VT_LOCAL | VT_LVAL;
3944 /* pass it as 'int' to avoid structure arg passing
3945 problems */
3946 vseti(VT_LOCAL, loc);
3947 ret.c = vtop->c;
3948 nb_args++;
3949 }
3950 } else {
3951 sret = 0;
3952 ret.type = s->type;
3953 }
3954
3955 if (!sret) {
3956 /* return in register */
3957 if (is_float(ret.type.t)) {
3958 ret.r = reg_fret(ret.type.t);
3959 #ifdef TCC_TARGET_X86_64
3960 if ((ret.type.t & VT_BTYPE) == VT_QFLOAT)
3961 ret.r2 = REG_QRET;
3962 #endif
3963 } else {
3964 #ifdef TCC_TARGET_X86_64
3965 if ((ret.type.t & VT_BTYPE) == VT_QLONG)
3966 #else
3967 if ((ret.type.t & VT_BTYPE) == VT_LLONG)
3968 #endif
3969 ret.r2 = REG_LRET;
3970 ret.r = REG_IRET;
3971 }
3972 ret.c.i = 0;
3973 }
3974 if (tok != ')') {
3975 for(;;) {
3976 expr_eq();
3977 gfunc_param_typed(s, sa);
3978 nb_args++;
3979 if (sa)
3980 sa = sa->next;
3981 if (tok == ')')
3982 break;
3983 skip(',');
3984 }
3985 }
3986 if (sa)
3987 tcc_error("too few arguments to function");
3988 skip(')');
3989 if (!nocode_wanted) {
3990 gfunc_call(nb_args);
3991 } else {
3992 vtop -= (nb_args + 1);
3993 }
3994 /* return value */
3995 vsetc(&ret.type, ret.r, &ret.c);
3996 vtop->r2 = ret.r2;
3997 /* handle packed struct return */
3998 if (((s->type.t & VT_BTYPE) == VT_STRUCT) && !sret) {
3999 int addr;
4000 size = type_size(&s->type, &align);
4001 loc = (loc - size) & -align;
4002 addr = loc;
4003 vset(&ret.type, VT_LOCAL | VT_LVAL, addr);
4004 vswap();
4005 vstore();
4006 vtop--;
4007 vset(&s->type, VT_LOCAL | VT_LVAL, addr);
4008 }
4009 } else {
4010 break;
4011 }
4012 }
4013 }
4014
4015 ST_FUNC void expr_prod(void)
4016 {
4017 int t;
4018
4019 unary();
4020 while (tok == '*' || tok == '/' || tok == '%') {
4021 t = tok;
4022 next();
4023 unary();
4024 gen_op(t);
4025 }
4026 }
4027
4028 ST_FUNC void expr_sum(void)
4029 {
4030 int t;
4031
4032 expr_prod();
4033 while (tok == '+' || tok == '-') {
4034 t = tok;
4035 next();
4036 expr_prod();
4037 gen_op(t);
4038 }
4039 }
4040
4041 static void expr_shift(void)
4042 {
4043 int t;
4044
4045 expr_sum();
4046 while (tok == TOK_SHL || tok == TOK_SAR) {
4047 t = tok;
4048 next();
4049 expr_sum();
4050 gen_op(t);
4051 }
4052 }
4053
4054 static void expr_cmp(void)
4055 {
4056 int t;
4057
4058 expr_shift();
4059 while ((tok >= TOK_ULE && tok <= TOK_GT) ||
4060 tok == TOK_ULT || tok == TOK_UGE) {
4061 t = tok;
4062 next();
4063 expr_shift();
4064 gen_op(t);
4065 }
4066 }
4067
4068 static void expr_cmpeq(void)
4069 {
4070 int t;
4071
4072 expr_cmp();
4073 while (tok == TOK_EQ || tok == TOK_NE) {
4074 t = tok;
4075 next();
4076 expr_cmp();
4077 gen_op(t);
4078 }
4079 }
4080
4081 static void expr_and(void)
4082 {
4083 expr_cmpeq();
4084 while (tok == '&') {
4085 next();
4086 expr_cmpeq();
4087 gen_op('&');
4088 }
4089 }
4090
4091 static void expr_xor(void)
4092 {
4093 expr_and();
4094 while (tok == '^') {
4095 next();
4096 expr_and();
4097 gen_op('^');
4098 }
4099 }
4100
4101 static void expr_or(void)
4102 {
4103 expr_xor();
4104 while (tok == '|') {
4105 next();
4106 expr_xor();
4107 gen_op('|');
4108 }
4109 }
4110
4111 /* XXX: fix this mess */
4112 static void expr_land_const(void)
4113 {
4114 expr_or();
4115 while (tok == TOK_LAND) {
4116 next();
4117 expr_or();
4118 gen_op(TOK_LAND);
4119 }
4120 }
4121
4122 /* XXX: fix this mess */
4123 static void expr_lor_const(void)
4124 {
4125 expr_land_const();
4126 while (tok == TOK_LOR) {
4127 next();
4128 expr_land_const();
4129 gen_op(TOK_LOR);
4130 }
4131 }
4132
4133 /* only used if non constant */
4134 static void expr_land(void)
4135 {
4136 int t;
4137
4138 expr_or();
4139 if (tok == TOK_LAND) {
4140 t = 0;
4141 save_regs(1);
4142 for(;;) {
4143 t = gtst(1, t);
4144 if (tok != TOK_LAND) {
4145 vseti(VT_JMPI, t);
4146 break;
4147 }
4148 next();
4149 expr_or();
4150 }
4151 }
4152 }
4153
4154 static void expr_lor(void)
4155 {
4156 int t;
4157
4158 expr_land();
4159 if (tok == TOK_LOR) {
4160 t = 0;
4161 save_regs(1);
4162 for(;;) {
4163 t = gtst(0, t);
4164 if (tok != TOK_LOR) {
4165 vseti(VT_JMP, t);
4166 break;
4167 }
4168 next();
4169 expr_land();
4170 }
4171 }
4172 }
4173
4174 /* XXX: better constant handling */
4175 static void expr_cond(void)
4176 {
4177 int tt, u, r1, r2, rc, t1, t2, bt1, bt2;
4178 SValue sv;
4179 CType type, type1, type2;
4180
4181 if (const_wanted) {
4182 expr_lor_const();
4183 if (tok == '?') {
4184 CType boolean;
4185 int c;
4186 boolean.t = VT_BOOL;
4187 vdup();
4188 gen_cast(&boolean);
4189 c = vtop->c.i;
4190 vpop();
4191 next();
4192 if (tok != ':' || !gnu_ext) {
4193 vpop();
4194 gexpr();
4195 }
4196 if (!c)
4197 vpop();
4198 skip(':');
4199 expr_cond();
4200 if (c)
4201 vpop();
4202 }
4203 } else {
4204 expr_lor();
4205 if (tok == '?') {
4206 next();
4207 if (vtop != vstack) {
4208 /* needed to avoid having different registers saved in
4209 each branch */
4210 if (is_float(vtop->type.t)) {
4211 rc = RC_FLOAT;
4212 #ifdef TCC_TARGET_X86_64
4213 if ((vtop->type.t & VT_BTYPE) == VT_LDOUBLE) {
4214 rc = RC_ST0;
4215 }
4216 #endif
4217 }
4218 else
4219 rc = RC_INT;
4220 gv(rc);
4221 save_regs(1);
4222 }
4223 if (tok == ':' && gnu_ext) {
4224 gv_dup();
4225 tt = gtst(1, 0);
4226 } else {
4227 tt = gtst(1, 0);
4228 gexpr();
4229 }
4230 type1 = vtop->type;
4231 sv = *vtop; /* save value to handle it later */
4232 vtop--; /* no vpop so that FP stack is not flushed */
4233 skip(':');
4234 u = gjmp(0);
4235 gsym(tt);
4236 expr_cond();
4237 type2 = vtop->type;
4238
4239 t1 = type1.t;
4240 bt1 = t1 & VT_BTYPE;
4241 t2 = type2.t;
4242 bt2 = t2 & VT_BTYPE;
4243 /* cast operands to correct type according to ISOC rules */
4244 if (is_float(bt1) || is_float(bt2)) {
4245 if (bt1 == VT_LDOUBLE || bt2 == VT_LDOUBLE) {
4246 type.t = VT_LDOUBLE;
4247 } else if (bt1 == VT_DOUBLE || bt2 == VT_DOUBLE) {
4248 type.t = VT_DOUBLE;
4249 } else {
4250 type.t = VT_FLOAT;
4251 }
4252 } else if (bt1 == VT_LLONG || bt2 == VT_LLONG) {
4253 /* cast to biggest op */
4254 type.t = VT_LLONG;
4255 /* convert to unsigned if it does not fit in a long long */
4256 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED) ||
4257 (t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED))
4258 type.t |= VT_UNSIGNED;
4259 } else if (bt1 == VT_PTR || bt2 == VT_PTR) {
4260 /* If one is a null ptr constant the result type
4261 is the other. */
4262 if (is_null_pointer (vtop))
4263 type = type1;
4264 else if (is_null_pointer (&sv))
4265 type = type2;
4266 /* XXX: test pointer compatibility, C99 has more elaborate
4267 rules here. */
4268 else
4269 type = type1;
4270 } else if (bt1 == VT_FUNC || bt2 == VT_FUNC) {
4271 /* XXX: test function pointer compatibility */
4272 type = bt1 == VT_FUNC ? type1 : type2;
4273 } else if (bt1 == VT_STRUCT || bt2 == VT_STRUCT) {
4274 /* XXX: test structure compatibility */
4275 type = bt1 == VT_STRUCT ? type1 : type2;
4276 } else if (bt1 == VT_VOID || bt2 == VT_VOID) {
4277 /* NOTE: as an extension, we accept void on only one side */
4278 type.t = VT_VOID;
4279 } else {
4280 /* integer operations */
4281 type.t = VT_INT;
4282 /* convert to unsigned if it does not fit in an integer */
4283 if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED) ||
4284 (t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED))
4285 type.t |= VT_UNSIGNED;
4286 }
4287
4288 /* now we convert second operand */
4289 gen_cast(&type);
4290 if (VT_STRUCT == (vtop->type.t & VT_BTYPE))
4291 gaddrof();
4292 rc = RC_INT;
4293 if (is_float(type.t)) {
4294 rc = RC_FLOAT;
4295 #ifdef TCC_TARGET_X86_64
4296 if ((type.t & VT_BTYPE) == VT_LDOUBLE) {
4297 rc = RC_ST0;
4298 }
4299 #endif
4300 } else if ((type.t & VT_BTYPE) == VT_LLONG) {
4301 /* for long longs, we use fixed registers to avoid having
4302 to handle a complicated move */
4303 rc = RC_IRET;
4304 }
4305
4306 r2 = gv(rc);
4307 /* this is horrible, but we must also convert first
4308 operand */
4309 tt = gjmp(0);
4310 gsym(u);
4311 /* put again first value and cast it */
4312 *vtop = sv;
4313 gen_cast(&type);
4314 if (VT_STRUCT == (vtop->type.t & VT_BTYPE))
4315 gaddrof();
4316 r1 = gv(rc);
4317 move_reg(r2, r1, type.t);
4318 vtop->r = r2;
4319 gsym(tt);
4320 }
4321 }
4322 }
4323
4324 static void expr_eq(void)
4325 {
4326 int t;
4327
4328 expr_cond();
4329 if (tok == '=' ||
4330 (tok >= TOK_A_MOD && tok <= TOK_A_DIV) ||
4331 tok == TOK_A_XOR || tok == TOK_A_OR ||
4332 tok == TOK_A_SHL || tok == TOK_A_SAR) {
4333 test_lvalue();
4334 t = tok;
4335 next();
4336 if (t == '=') {
4337 expr_eq();
4338 } else {
4339 vdup();
4340 expr_eq();
4341 gen_op(t & 0x7f);
4342 }
4343 vstore();
4344 }
4345 }
4346
4347 ST_FUNC void gexpr(void)
4348 {
4349 while (1) {
4350 expr_eq();
4351 if (tok != ',')
4352 break;
4353 vpop();
4354 next();
4355 }
4356 }
4357
4358 /* parse an expression and return its type without any side effect. */
4359 static void expr_type(CType *type)
4360 {
4361 int saved_nocode_wanted;
4362
4363 saved_nocode_wanted = nocode_wanted;
4364 nocode_wanted = 1;
4365 gexpr();
4366 *type = vtop->type;
4367 vpop();
4368 nocode_wanted = saved_nocode_wanted;
4369 }
4370
4371 /* parse a unary expression and return its type without any side
4372 effect. */
4373 static void unary_type(CType *type)
4374 {
4375 int a;
4376
4377 a = nocode_wanted;
4378 nocode_wanted = 1;
4379 unary();
4380 *type = vtop->type;
4381 vpop();
4382 nocode_wanted = a;
4383 }
4384
4385 /* parse a constant expression and return value in vtop. */
4386 static void expr_const1(void)
4387 {
4388 int a;
4389 a = const_wanted;
4390 const_wanted = 1;
4391 expr_cond();
4392 const_wanted = a;
4393 }
4394
4395 /* parse an integer constant and return its value. */
4396 ST_FUNC int expr_const(void)
4397 {
4398 int c;
4399 expr_const1();
4400 if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) != VT_CONST)
4401 expect("constant expression");
4402 c = vtop->c.i;
4403 vpop();
4404 return c;
4405 }
4406
4407 /* return the label token if current token is a label, otherwise
4408 return zero */
4409 static int is_label(void)
4410 {
4411 int last_tok;
4412
4413 /* fast test first */
4414 if (tok < TOK_UIDENT)
4415 return 0;
4416 /* no need to save tokc because tok is an identifier */
4417 last_tok = tok;
4418 next();
4419 if (tok == ':') {
4420 next();
4421 return last_tok;
4422 } else {
4423 unget_tok(last_tok);
4424 return 0;
4425 }
4426 }
4427
4428 static void label_or_decl(int l)
4429 {
4430 int last_tok;
4431
4432 /* fast test first */
4433 if (tok >= TOK_UIDENT)
4434 {
4435 /* no need to save tokc because tok is an identifier */
4436 last_tok = tok;
4437 next();
4438 if (tok == ':') {
4439 unget_tok(last_tok);
4440 return;
4441 }
4442 unget_tok(last_tok);
4443 }
4444 decl(l);
4445 }
4446
4447 static void block(int *bsym, int *csym, int *case_sym, int *def_sym,
4448 int case_reg, int is_expr)
4449 {
4450 int a, b, c, d;
4451 Sym *s, *frame_bottom;
4452
4453 /* generate line number info */
4454 if (tcc_state->do_debug &&
4455 (last_line_num != file->line_num || last_ind != ind)) {
4456 put_stabn(N_SLINE, 0, file->line_num, ind - func_ind);
4457 last_ind = ind;
4458 last_line_num = file->line_num;
4459 }
4460
4461 if (is_expr) {
4462 /* default return value is (void) */
4463 vpushi(0);
4464 vtop->type.t = VT_VOID;
4465 }
4466
4467 if (tok == TOK_IF) {
4468 /* if test */
4469 next();
4470 skip('(');
4471 gexpr();
4472 skip(')');
4473 a = gtst(1, 0);
4474 block(bsym, csym, case_sym, def_sym, case_reg, 0);
4475 c = tok;
4476 if (c == TOK_ELSE) {
4477 next();
4478 d = gjmp(0);
4479 gsym(a);
4480 block(bsym, csym, case_sym, def_sym, case_reg, 0);
4481 gsym(d); /* patch else jmp */
4482 } else
4483 gsym(a);
4484 } else if (tok == TOK_WHILE) {
4485 next();
4486 d = ind;
4487 skip('(');
4488 gexpr();
4489 skip(')');
4490 a = gtst(1, 0);
4491 b = 0;
4492 block(&a, &b, case_sym, def_sym, case_reg, 0);
4493 gjmp_addr(d);
4494 gsym(a);
4495 gsym_addr(b, d);
4496 } else if (tok == '{') {
4497 Sym *llabel;
4498 int block_vla_sp_loc, *saved_vla_sp_loc, saved_vla_flags;
4499
4500 next();
4501 /* record local declaration stack position */
4502 s = local_stack;
4503 frame_bottom = sym_push2(&local_stack, SYM_FIELD, 0, 0);
4504 frame_bottom->next = scope_stack_bottom;
4505 scope_stack_bottom = frame_bottom;
4506 llabel = local_label_stack;
4507
4508 /* save VLA state */
4509 block_vla_sp_loc = *(saved_vla_sp_loc = vla_sp_loc);
4510 if (saved_vla_sp_loc != &vla_sp_root_loc)
4511 vla_sp_loc = &block_vla_sp_loc;
4512
4513 saved_vla_flags = vla_flags;
4514 vla_flags |= VLA_NEED_NEW_FRAME;
4515
4516 /* handle local labels declarations */
4517 if (tok == TOK_LABEL) {
4518 next();
4519 for(;;) {
4520 if (tok < TOK_UIDENT)
4521 expect("label identifier");
4522 label_push(&local_label_stack, tok, LABEL_DECLARED);
4523 next();
4524 if (tok == ',') {
4525 next();
4526 } else {
4527 skip(';');
4528 break;
4529 }
4530 }
4531 }
4532 while (tok != '}') {
4533 label_or_decl(VT_LOCAL);
4534 if (tok != '}') {
4535 if (is_expr)
4536 vpop();
4537 block(bsym, csym, case_sym, def_sym, case_reg, is_expr);
4538 }
4539 }
4540 /* pop locally defined labels */
4541 label_pop(&local_label_stack, llabel);
4542 if(is_expr) {
4543 /* XXX: this solution makes only valgrind happy...
4544 triggered by gcc.c-torture/execute/20000917-1.c */
4545 Sym *p;
4546 switch(vtop->type.t & VT_BTYPE) {
4547 case VT_PTR:
4548 case VT_STRUCT:
4549 case VT_ENUM:
4550 case VT_FUNC:
4551 for(p=vtop->type.ref;p;p=p->prev)
4552 if(p->prev==s)
4553 tcc_error("unsupported expression type");
4554 }
4555 }
4556 /* pop locally defined symbols */
4557 scope_stack_bottom = scope_stack_bottom->next;
4558 sym_pop(&local_stack, s);
4559
4560 /* Pop VLA frames and restore stack pointer if required */
4561 if (saved_vla_sp_loc != &vla_sp_root_loc)
4562 *saved_vla_sp_loc = block_vla_sp_loc;
4563 if (vla_sp_loc != (saved_vla_sp_loc == &vla_sp_root_loc ? &vla_sp_root_loc : &block_vla_sp_loc)) {
4564 vla_sp_loc = saved_vla_sp_loc;
4565 gen_vla_sp_restore(*vla_sp_loc);
4566 }
4567 vla_flags = (vla_flags & ~VLA_SCOPE_FLAGS) | (saved_vla_flags & VLA_SCOPE_FLAGS);
4568
4569 next();
4570 } else if (tok == TOK_RETURN) {
4571 next();
4572 if (tok != ';') {
4573 gexpr();
4574 gen_assign_cast(&func_vt);
4575 if ((func_vt.t & VT_BTYPE) == VT_STRUCT) {
4576 CType type, ret_type;
4577 int ret_align;
4578 if (gfunc_sret(&func_vt, &ret_type, &ret_align)) {
4579 /* if returning structure, must copy it to implicit
4580 first pointer arg location */
4581 type = func_vt;
4582 mk_pointer(&type);
4583 vset(&type, VT_LOCAL | VT_LVAL, func_vc);
4584 indir();
4585 vswap();
4586 /* copy structure value to pointer */
4587 vstore();
4588 } else {
4589 /* returning structure packed into registers */
4590 int size, addr, align;
4591 size = type_size(&func_vt,&align);
4592 if ((vtop->r != (VT_LOCAL | VT_LVAL) || (vtop->c.i & (ret_align-1)))
4593 && (align & (ret_align-1))) {
4594 loc = (loc - size) & -align;
4595 addr = loc;
4596 type = func_vt;
4597 vset(&type, VT_LOCAL | VT_LVAL, addr);
4598 vswap();
4599 vstore();
4600 vset(&ret_type, VT_LOCAL | VT_LVAL, addr);
4601 }
4602 vtop->type = ret_type;
4603 if (is_float(ret_type.t))
4604 gv(rc_fret(ret_type.t));
4605 else
4606 gv(RC_IRET);
4607 }
4608 } else if (is_float(func_vt.t)) {
4609 gv(rc_fret(func_vt.t));
4610 } else {
4611 gv(RC_IRET);
4612 }
4613 vtop--; /* NOT vpop() because on x86 it would flush the fp stack */
4614 }
4615 skip(';');
4616 rsym = gjmp(rsym); /* jmp */
4617 } else if (tok == TOK_BREAK) {
4618 /* compute jump */
4619 if (!bsym)
4620 tcc_error("cannot break");
4621 *bsym = gjmp(*bsym);
4622 next();
4623 skip(';');
4624 } else if (tok == TOK_CONTINUE) {
4625 /* compute jump */
4626 if (!csym)
4627 tcc_error("cannot continue");
4628 *csym = gjmp(*csym);
4629 next();
4630 skip(';');
4631 } else if (tok == TOK_FOR) {
4632 int e;
4633 next();
4634 skip('(');
4635 s = local_stack;
4636 frame_bottom = sym_push2(&local_stack, SYM_FIELD, 0, 0);
4637 frame_bottom->next = scope_stack_bottom;
4638 scope_stack_bottom = frame_bottom;
4639 if (tok != ';') {
4640 /* c99 for-loop init decl? */
4641 if (!decl0(VT_LOCAL, 1)) {
4642 /* no, regular for-loop init expr */
4643 gexpr();
4644 vpop();
4645 }
4646 }
4647 skip(';');
4648 d = ind;
4649 c = ind;
4650 a = 0;
4651 b = 0;
4652 if (tok != ';') {
4653 gexpr();
4654 a = gtst(1, 0);
4655 }
4656 skip(';');
4657 if (tok != ')') {
4658 e = gjmp(0);
4659 c = ind;
4660 gexpr();
4661 vpop();
4662 gjmp_addr(d);
4663 gsym(e);
4664 }
4665 skip(')');
4666 block(&a, &b, case_sym, def_sym, case_reg, 0);
4667 gjmp_addr(c);
4668 gsym(a);
4669 gsym_addr(b, c);
4670 scope_stack_bottom = scope_stack_bottom->next;
4671 sym_pop(&local_stack, s);
4672 } else
4673 if (tok == TOK_DO) {
4674 next();
4675 a = 0;
4676 b = 0;
4677 d = ind;
4678 block(&a, &b, case_sym, def_sym, case_reg, 0);
4679 skip(TOK_WHILE);
4680 skip('(');
4681 gsym(b);
4682 gexpr();
4683 c = gtst(0, 0);
4684 gsym_addr(c, d);
4685 skip(')');
4686 gsym(a);
4687 skip(';');
4688 } else
4689 if (tok == TOK_SWITCH) {
4690 next();
4691 skip('(');
4692 gexpr();
4693 /* XXX: other types than integer */
4694 case_reg = gv(RC_INT);
4695 vpop();
4696 skip(')');
4697 a = 0;
4698 b = gjmp(0); /* jump to first case */
4699 c = 0;
4700 block(&a, csym, &b, &c, case_reg, 0);
4701 /* if no default, jmp after switch */
4702 if (c == 0)
4703 c = ind;
4704 /* default label */
4705 gsym_addr(b, c);
4706 /* break label */
4707 gsym(a);
4708 } else
4709 if (tok == TOK_CASE) {
4710 int v1, v2;
4711 if (!case_sym)
4712 expect("switch");
4713 next();
4714 v1 = expr_const();
4715 v2 = v1;
4716 if (gnu_ext && tok == TOK_DOTS) {
4717 next();
4718 v2 = expr_const();
4719 if (v2 < v1)
4720 tcc_warning("empty case range");
4721 }
4722 /* since a case is like a label, we must skip it with a jmp */
4723 b = gjmp(0);
4724 gsym(*case_sym);
4725 vseti(case_reg, 0);
4726 vpushi(v1);
4727 if (v1 == v2) {
4728 gen_op(TOK_EQ);
4729 *case_sym = gtst(1, 0);
4730 } else {
4731 gen_op(TOK_GE);
4732 *case_sym = gtst(1, 0);
4733 vseti(case_reg, 0);
4734 vpushi(v2);
4735 gen_op(TOK_LE);
4736 *case_sym = gtst(1, *case_sym);
4737 }
4738 gsym(b);
4739 skip(':');
4740 is_expr = 0;
4741 goto block_after_label;
4742 } else
4743 if (tok == TOK_DEFAULT) {
4744 next();
4745 skip(':');
4746 if (!def_sym)
4747 expect("switch");
4748 if (*def_sym)
4749 tcc_error("too many 'default'");
4750 *def_sym = ind;
4751 is_expr = 0;
4752 goto block_after_label;
4753 } else
4754 if (tok == TOK_GOTO) {
4755 next();
4756 if (tok == '*' && gnu_ext) {
4757 /* computed goto */
4758 next();
4759 gexpr();
4760 if ((vtop->type.t & VT_BTYPE) != VT_PTR)
4761 expect("pointer");
4762 ggoto();
4763 } else if (tok >= TOK_UIDENT) {
4764 s = label_find(tok);
4765 /* put forward definition if needed */
4766 if (!s) {
4767 s = label_push(&global_label_stack, tok, LABEL_FORWARD);
4768 } else {
4769 if (s->r == LABEL_DECLARED)
4770 s->r = LABEL_FORWARD;
4771 }
4772 /* label already defined */
4773 if (vla_flags & VLA_IN_SCOPE) {
4774 /* If VLAs are in use, save the current stack pointer and
4775 reset the stack pointer to what it was at function entry
4776 (label will restore stack pointer in inner scopes) */
4777 vla_sp_save();
4778 gen_vla_sp_restore(vla_sp_root_loc);
4779 }
4780 if (s->r & LABEL_FORWARD)
4781 s->jnext = gjmp(s->jnext);
4782 else
4783 gjmp_addr(s->jnext);
4784 next();
4785 } else {
4786 expect("label identifier");
4787 }
4788 skip(';');
4789 } else if (tok == TOK_ASM1 || tok == TOK_ASM2 || tok == TOK_ASM3) {
4790 asm_instr();
4791 } else {
4792 b = is_label();
4793 if (b) {
4794 /* label case */
4795 if (vla_flags & VLA_IN_SCOPE) {
4796 /* save/restore stack pointer across label
4797 this is a no-op when combined with the load immediately
4798 after the label unless we arrive via goto */
4799 vla_sp_save();
4800 }
4801 s = label_find(b);
4802 if (s) {
4803 if (s->r == LABEL_DEFINED)
4804 tcc_error("duplicate label '%s'", get_tok_str(s->v, NULL));
4805 gsym(s->jnext);
4806 s->r = LABEL_DEFINED;
4807 } else {
4808 s = label_push(&global_label_stack, b, LABEL_DEFINED);
4809 }
4810 s->jnext = ind;
4811 if (vla_flags & VLA_IN_SCOPE) {
4812 gen_vla_sp_restore(*vla_sp_loc);
4813 vla_flags |= VLA_NEED_NEW_FRAME;
4814 }
4815 /* we accept this, but it is a mistake */
4816 block_after_label:
4817 if (tok == '}') {
4818 tcc_warning("deprecated use of label at end of compound statement");
4819 } else {
4820 if (is_expr)
4821 vpop();
4822 block(bsym, csym, case_sym, def_sym, case_reg, is_expr);
4823 }
4824 } else {
4825 /* expression case */
4826 if (tok != ';') {
4827 if (is_expr) {
4828 vpop();
4829 gexpr();
4830 } else {
4831 gexpr();
4832 vpop();
4833 }
4834 }
4835 skip(';');
4836 }
4837 }
4838 }
4839
4840 /* t is the array or struct type. c is the array or struct
4841 address. cur_index/cur_field is the pointer to the current
4842 value. 'size_only' is true if only size info is needed (only used
4843 in arrays) */
4844 static void decl_designator(CType *type, Section *sec, unsigned long c,
4845 int *cur_index, Sym **cur_field,
4846 int size_only)
4847 {
4848 Sym *s, *f;
4849 int notfirst, index, index_last, align, l, nb_elems, elem_size;
4850 CType type1;
4851
4852 notfirst = 0;
4853 elem_size = 0;
4854 nb_elems = 1;
4855 if (gnu_ext && (l = is_label()) != 0)
4856 goto struct_field;
4857 while (tok == '[' || tok == '.') {
4858 if (tok == '[') {
4859 if (!(type->t & VT_ARRAY))
4860 expect("array type");
4861 s = type->ref;
4862 next();
4863 index = expr_const();
4864 if (index < 0 || (s->c >= 0 && index >= s->c))
4865 expect("invalid index");
4866 if (tok == TOK_DOTS && gnu_ext) {
4867 next();
4868 index_last = expr_const();
4869 if (index_last < 0 ||
4870 (s->c >= 0 && index_last >= s->c) ||
4871 index_last < index)
4872 expect("invalid index");
4873 } else {
4874 index_last = index;
4875 }
4876 skip(']');
4877 if (!notfirst)
4878 *cur_index = index_last;
4879 type = pointed_type(type);
4880 elem_size = type_size(type, &align);
4881 c += index * elem_size;
4882 /* NOTE: we only support ranges for last designator */
4883 nb_elems = index_last - index + 1;
4884 if (nb_elems != 1) {
4885 notfirst = 1;
4886 break;
4887 }
4888 } else {
4889 next();
4890 l = tok;
4891 next();
4892 struct_field:
4893 if ((type->t & VT_BTYPE) != VT_STRUCT)
4894 expect("struct/union type");
4895 s = type->ref;
4896 l |= SYM_FIELD;
4897 f = s->next;
4898 while (f) {
4899 if (f->v == l)
4900 break;
4901 f = f->next;
4902 }
4903 if (!f)
4904 expect("field");
4905 if (!notfirst)
4906 *cur_field = f;
4907 /* XXX: fix this mess by using explicit storage field */
4908 type1 = f->type;
4909 type1.t |= (type->t & ~VT_TYPE);
4910 type = &type1;
4911 c += f->c;
4912 }
4913 notfirst = 1;
4914 }
4915 if (notfirst) {
4916 if (tok == '=') {
4917 next();
4918 } else {
4919 if (!gnu_ext)
4920 expect("=");
4921 }
4922 } else {
4923 if (type->t & VT_ARRAY) {
4924 index = *cur_index;
4925 type = pointed_type(type);
4926 c += index * type_size(type, &align);
4927 } else {
4928 f = *cur_field;
4929 if (!f)
4930 tcc_error("too many field init");
4931 /* XXX: fix this mess by using explicit storage field */
4932 type1 = f->type;
4933 type1.t |= (type->t & ~VT_TYPE);
4934 type = &type1;
4935 c += f->c;
4936 }
4937 }
4938 decl_initializer(type, sec, c, 0, size_only);
4939
4940 /* XXX: make it more general */
4941 if (!size_only && nb_elems > 1) {
4942 unsigned long c_end;
4943 uint8_t *src, *dst;
4944 int i;
4945
4946 if (!sec)
4947 tcc_error("range init not supported yet for dynamic storage");
4948 c_end = c + nb_elems * elem_size;
4949 if (c_end > sec->data_allocated)
4950 section_realloc(sec, c_end);
4951 src = sec->data + c;
4952 dst = src;
4953 for(i = 1; i < nb_elems; i++) {
4954 dst += elem_size;
4955 memcpy(dst, src, elem_size);
4956 }
4957 }
4958 }
4959
4960 #define EXPR_VAL 0
4961 #define EXPR_CONST 1
4962 #define EXPR_ANY 2
4963
4964 /* store a value or an expression directly in global data or in local array */
4965 static void init_putv(CType *type, Section *sec, unsigned long c,
4966 int v, int expr_type)
4967 {
4968 int saved_global_expr, bt, bit_pos, bit_size;
4969 void *ptr;
4970 unsigned long long bit_mask;
4971 CType dtype;
4972
4973 switch(expr_type) {
4974 case EXPR_VAL:
4975 vpushi(v);
4976 break;
4977 case EXPR_CONST:
4978 /* compound literals must be allocated globally in this case */
4979 saved_global_expr = global_expr;
4980 global_expr = 1;
4981 expr_const1();
4982 global_expr = saved_global_expr;
4983 /* NOTE: symbols are accepted */
4984 if ((vtop->r & (VT_VALMASK | VT_LVAL)) != VT_CONST)
4985 tcc_error("initializer element is not constant");
4986 break;
4987 case EXPR_ANY:
4988 expr_eq();
4989 break;
4990 }
4991
4992 dtype = *type;
4993 dtype.t &= ~VT_CONSTANT; /* need to do that to avoid false warning */
4994
4995 if (sec) {
4996 /* XXX: not portable */
4997 /* XXX: generate error if incorrect relocation */
4998 gen_assign_cast(&dtype);
4999 bt = type->t & VT_BTYPE;
5000 /* we'll write at most 12 bytes */
5001 if (c + 12 > sec->data_allocated) {
5002 section_realloc(sec, c + 12);
5003 }
5004 ptr = sec->data + c;
5005 /* XXX: make code faster ? */
5006 if (!(type->t & VT_BITFIELD)) {
5007 bit_pos = 0;
5008 bit_size = 32;
5009 bit_mask = -1LL;
5010 } else {
5011 bit_pos = (vtop->type.t >> VT_STRUCT_SHIFT) & 0x3f;
5012 bit_size = (vtop->type.t >> (VT_STRUCT_SHIFT + 6)) & 0x3f;
5013 bit_mask = (1LL << bit_size) - 1;
5014 }
5015 if ((vtop->r & VT_SYM) &&
5016 (bt == VT_BYTE ||
5017 bt == VT_SHORT ||
5018 bt == VT_DOUBLE ||
5019 bt == VT_LDOUBLE ||
5020 bt == VT_LLONG ||
5021 (bt == VT_INT && bit_size != 32)))
5022 tcc_error("initializer element is not computable at load time");
5023 switch(bt) {
5024 case VT_BOOL:
5025 vtop->c.i = (vtop->c.i != 0);
5026 case VT_BYTE:
5027 *(char *)ptr |= (vtop->c.i & bit_mask) << bit_pos;
5028 break;
5029 case VT_SHORT:
5030 *(short *)ptr |= (vtop->c.i & bit_mask) << bit_pos;
5031 break;
5032 case VT_DOUBLE:
5033 *(double *)ptr = vtop->c.d;
5034 break;
5035 case VT_LDOUBLE:
5036 *(long double *)ptr = vtop->c.ld;
5037 break;
5038 case VT_LLONG:
5039 *(long long *)ptr |= (vtop->c.ll & bit_mask) << bit_pos;
5040 break;
5041 default:
5042 if (vtop->r & VT_SYM) {
5043 greloc(sec, vtop->sym, c, R_DATA_PTR);
5044 }
5045 *(int *)ptr |= (vtop->c.i & bit_mask) << bit_pos;
5046 break;
5047 }
5048 vtop--;
5049 } else {
5050 vset(&dtype, VT_LOCAL|VT_LVAL, c);
5051 vswap();
5052 vstore();
5053 vpop();
5054 }
5055 }
5056
5057 /* put zeros for variable based init */
5058 static void init_putz(CType *t, Section *sec, unsigned long c, int size)
5059 {
5060 if (sec) {
5061 /* nothing to do because globals are already set to zero */
5062 } else {
5063 vpush_global_sym(&func_old_type, TOK_memset);
5064 vseti(VT_LOCAL, c);
5065 vpushi(0);
5066 vpushs(size);
5067 gfunc_call(3);
5068 }
5069 }
5070
5071 /* 't' contains the type and storage info. 'c' is the offset of the
5072 object in section 'sec'. If 'sec' is NULL, it means stack based
5073 allocation. 'first' is true if array '{' must be read (multi
5074 dimension implicit array init handling). 'size_only' is true if
5075 size only evaluation is wanted (only for arrays). */
5076 static void decl_initializer(CType *type, Section *sec, unsigned long c,
5077 int first, int size_only)
5078 {
5079 int index, array_length, n, no_oblock, nb, parlevel, parlevel1, i;
5080 int size1, align1, expr_type;
5081 Sym *s, *f;
5082 CType *t1;
5083
5084 if (type->t & VT_VLA) {
5085 int a;
5086
5087 /* save current stack pointer */
5088 if (vla_flags & VLA_NEED_NEW_FRAME) {
5089 vla_sp_save();
5090 vla_flags = VLA_IN_SCOPE;
5091 vla_sp_loc = &vla_sp_loc_tmp;
5092 }
5093
5094 vla_runtime_type_size(type, &a);
5095 gen_vla_alloc(type, a);
5096 vset(type, VT_LOCAL|VT_LVAL, c);
5097 vswap();
5098 vstore();
5099 vpop();
5100 } else if (type->t & VT_ARRAY) {
5101 s = type->ref;
5102 n = s->c;
5103 array_length = 0;
5104 t1 = pointed_type(type);
5105 size1 = type_size(t1, &align1);
5106
5107 no_oblock = 1;
5108 if ((first && tok != TOK_LSTR && tok != TOK_STR) ||
5109 tok == '{') {
5110 if (tok != '{')
5111 tcc_error("character array initializer must be a literal,"
5112 " optionally enclosed in braces");
5113 skip('{');
5114 no_oblock = 0;
5115 }
5116
5117 /* only parse strings here if correct type (otherwise: handle
5118 them as ((w)char *) expressions */
5119 if ((tok == TOK_LSTR &&
5120 #ifdef TCC_TARGET_PE
5121 (t1->t & VT_BTYPE) == VT_SHORT && (t1->t & VT_UNSIGNED)
5122 #else
5123 (t1->t & VT_BTYPE) == VT_INT
5124 #endif
5125 ) || (tok == TOK_STR && (t1->t & VT_BTYPE) == VT_BYTE)) {
5126 while (tok == TOK_STR || tok == TOK_LSTR) {
5127 int cstr_len, ch;
5128 CString *cstr;
5129
5130 cstr = tokc.cstr;
5131 /* compute maximum number of chars wanted */
5132 if (tok == TOK_STR)
5133 cstr_len = cstr->size;
5134 else
5135 cstr_len = cstr->size / sizeof(nwchar_t);
5136 cstr_len--;
5137 nb = cstr_len;
5138 if (n >= 0 && nb > (n - array_length))
5139 nb = n - array_length;
5140 if (!size_only) {
5141 if (cstr_len > nb)
5142 tcc_warning("initializer-string for array is too long");
5143 /* in order to go faster for common case (char
5144 string in global variable, we handle it
5145 specifically */
5146 if (sec && tok == TOK_STR && size1 == 1) {
5147 memcpy(sec->data + c + array_length, cstr->data, nb);
5148 } else {
5149 for(i=0;i<nb;i++) {
5150 if (tok == TOK_STR)
5151 ch = ((unsigned char *)cstr->data)[i];
5152 else
5153 ch = ((nwchar_t *)cstr->data)[i];
5154 init_putv(t1, sec, c + (array_length + i) * size1,
5155 ch, EXPR_VAL);
5156 }
5157 }
5158 }
5159 array_length += nb;
5160 next();
5161 }
5162 /* only add trailing zero if enough storage (no
5163 warning in this case since it is standard) */
5164 if (n < 0 || array_length < n) {
5165 if (!size_only) {
5166 init_putv(t1, sec, c + (array_length * size1), 0, EXPR_VAL);
5167 }
5168 array_length++;
5169 }
5170 } else {
5171 index = 0;
5172 while (tok != '}') {
5173 decl_designator(type, sec, c, &index, NULL, size_only);
5174 if (n >= 0 && index >= n)
5175 tcc_error("index too large");
5176 /* must put zero in holes (note that doing it that way
5177 ensures that it even works with designators) */
5178 if (!size_only && array_length < index) {
5179 init_putz(t1, sec, c + array_length * size1,
5180 (index - array_length) * size1);
5181 }
5182 index++;
5183 if (index > array_length)
5184 array_length = index;
5185 /* special test for multi dimensional arrays (may not
5186 be strictly correct if designators are used at the
5187 same time) */
5188 if (index >= n && no_oblock)
5189 break;
5190 if (tok == '}')
5191 break;
5192 skip(',');
5193 }
5194 }
5195 if (!no_oblock)
5196 skip('}');
5197 /* put zeros at the end */
5198 if (!size_only && n >= 0 && array_length < n) {
5199 init_putz(t1, sec, c + array_length * size1,
5200 (n - array_length) * size1);
5201 }
5202 /* patch type size if needed */
5203 if (n < 0)
5204 s->c = array_length;
5205 } else if ((type->t & VT_BTYPE) == VT_STRUCT &&
5206 (sec || !first || tok == '{')) {
5207 int par_count;
5208
5209 /* NOTE: the previous test is a specific case for automatic
5210 struct/union init */
5211 /* XXX: union needs only one init */
5212
5213 /* XXX: this test is incorrect for local initializers
5214 beginning with ( without {. It would be much more difficult
5215 to do it correctly (ideally, the expression parser should
5216 be used in all cases) */
5217 par_count = 0;
5218 if (tok == '(') {
5219 AttributeDef ad1;
5220 CType type1;
5221 next();
5222 while (tok == '(') {
5223 par_count++;
5224 next();
5225 }
5226 if (!parse_btype(&type1, &ad1))
5227 expect("cast");
5228 type_decl(&type1, &ad1, &n, TYPE_ABSTRACT);
5229 #if 0
5230 if (!is_assignable_types(type, &type1))
5231 tcc_error("invalid type for cast");
5232 #endif
5233 skip(')');
5234 }
5235 no_oblock = 1;
5236 if (first || tok == '{') {
5237 skip('{');
5238 no_oblock = 0;
5239 }
5240 s = type->ref;
5241 f = s->next;
5242 array_length = 0;
5243 index = 0;
5244 n = s->c;
5245 while (tok != '}') {
5246 decl_designator(type, sec, c, NULL, &f, size_only);
5247 index = f->c;
5248 if (!size_only && array_length < index) {
5249 init_putz(type, sec, c + array_length,
5250 index - array_length);
5251 }
5252 index = index + type_size(&f->type, &align1);
5253 if (index > array_length)
5254 array_length = index;
5255
5256 /* gr: skip fields from same union - ugly. */
5257 while (f->next) {
5258 ///printf("index: %2d %08x -- %2d %08x\n", f->c, f->type.t, f->next->c, f->next->type.t);
5259 /* test for same offset */
5260 if (f->next->c != f->c)
5261 break;
5262 /* if yes, test for bitfield shift */
5263 if ((f->type.t & VT_BITFIELD) && (f->next->type.t & VT_BITFIELD)) {
5264 int bit_pos_1 = (f->type.t >> VT_STRUCT_SHIFT) & 0x3f;
5265 int bit_pos_2 = (f->next->type.t >> VT_STRUCT_SHIFT) & 0x3f;
5266 //printf("bitfield %d %d\n", bit_pos_1, bit_pos_2);
5267 if (bit_pos_1 != bit_pos_2)
5268 break;
5269 }
5270 f = f->next;
5271 }
5272
5273 f = f->next;
5274 if (no_oblock && f == NULL)
5275 break;
5276 if (tok == '}')
5277 break;
5278 skip(',');
5279 }
5280 /* put zeros at the end */
5281 if (!size_only && array_length < n) {
5282 init_putz(type, sec, c + array_length,
5283 n - array_length);
5284 }
5285 if (!no_oblock)
5286 skip('}');
5287 while (par_count) {
5288 skip(')');
5289 par_count--;
5290 }
5291 } else if (tok == '{') {
5292 next();
5293 decl_initializer(type, sec, c, first, size_only);
5294 skip('}');
5295 } else if (size_only) {
5296 /* just skip expression */
5297 parlevel = parlevel1 = 0;
5298 while ((parlevel > 0 || parlevel1 > 0 ||
5299 (tok != '}' && tok != ',')) && tok != -1) {
5300 if (tok == '(')
5301 parlevel++;
5302 else if (tok == ')')
5303 parlevel--;
5304 else if (tok == '{')
5305 parlevel1++;
5306 else if (tok == '}')
5307 parlevel1--;
5308 next();
5309 }
5310 } else {
5311 /* currently, we always use constant expression for globals
5312 (may change for scripting case) */
5313 expr_type = EXPR_CONST;
5314 if (!sec)
5315 expr_type = EXPR_ANY;
5316 init_putv(type, sec, c, 0, expr_type);
5317 }
5318 }
5319
5320 /* parse an initializer for type 't' if 'has_init' is non zero, and
5321 allocate space in local or global data space ('r' is either
5322 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
5323 variable 'v' with an associated name represented by 'asm_label' of
5324 scope 'scope' is declared before initializers are parsed. If 'v' is
5325 zero, then a reference to the new object is put in the value stack.
5326 If 'has_init' is 2, a special parsing is done to handle string
5327 constants. */
5328 static void decl_initializer_alloc(CType *type, AttributeDef *ad, int r,
5329 int has_init, int v, char *asm_label,
5330 int scope)
5331 {
5332 int size, align, addr, data_offset;
5333 int level;
5334 ParseState saved_parse_state = {0};
5335 TokenString init_str;
5336 Section *sec;
5337 Sym *flexible_array;
5338
5339 flexible_array = NULL;
5340 if ((type->t & VT_BTYPE) == VT_STRUCT) {
5341 Sym *field = type->ref->next;
5342 if (field) {
5343 while (field->next)
5344 field = field->next;
5345 if (field->type.t & VT_ARRAY && field->type.ref->c < 0)
5346 flexible_array = field;
5347 }
5348 }
5349
5350 size = type_size(type, &align);
5351 /* If unknown size, we must evaluate it before
5352 evaluating initializers because
5353 initializers can generate global data too
5354 (e.g. string pointers or ISOC99 compound
5355 literals). It also simplifies local
5356 initializers handling */
5357 tok_str_new(&init_str);
5358 if (size < 0 || (flexible_array && has_init)) {
5359 if (!has_init)
5360 tcc_error("unknown type size");
5361 /* get all init string */
5362 if (has_init == 2) {
5363 /* only get strings */
5364 while (tok == TOK_STR || tok == TOK_LSTR) {
5365 tok_str_add_tok(&init_str);
5366 next();
5367 }
5368 } else {
5369 level = 0;
5370 while (level > 0 || (tok != ',' && tok != ';')) {
5371 if (tok < 0)
5372 tcc_error("unexpected end of file in initializer");
5373 tok_str_add_tok(&init_str);
5374 if (tok == '{')
5375 level++;
5376 else if (tok == '}') {
5377 level--;
5378 if (level <= 0) {
5379 next();
5380 break;
5381 }
5382 }
5383 next();
5384 }
5385 }
5386 tok_str_add(&init_str, -1);
5387 tok_str_add(&init_str, 0);
5388
5389 /* compute size */
5390 save_parse_state(&saved_parse_state);
5391
5392 macro_ptr = init_str.str;
5393 next();
5394 decl_initializer(type, NULL, 0, 1, 1);
5395 /* prepare second initializer parsing */
5396 macro_ptr = init_str.str;
5397 next();
5398
5399 /* if still unknown size, error */
5400 size = type_size(type, &align);
5401 if (size < 0)
5402 tcc_error("unknown type size");
5403 }
5404 if (flexible_array)
5405 size += flexible_array->type.ref->c * pointed_size(&flexible_array->type);
5406 /* take into account specified alignment if bigger */
5407 if (ad->aligned) {
5408 if (ad->aligned > align)
5409 align = ad->aligned;
5410 } else if (ad->packed) {
5411 align = 1;
5412 }
5413 if ((r & VT_VALMASK) == VT_LOCAL) {
5414 sec = NULL;
5415 #ifdef CONFIG_TCC_BCHECK
5416 if (tcc_state->do_bounds_check && (type->t & VT_ARRAY)) {
5417 loc--;
5418 }
5419 #endif
5420 loc = (loc - size) & -align;
5421 addr = loc;
5422 #ifdef CONFIG_TCC_BCHECK
5423 /* handles bounds */
5424 /* XXX: currently, since we do only one pass, we cannot track
5425 '&' operators, so we add only arrays */
5426 if (tcc_state->do_bounds_check && (type->t & VT_ARRAY)) {
5427 unsigned long *bounds_ptr;
5428 /* add padding between regions */
5429 loc--;
5430 /* then add local bound info */
5431 bounds_ptr = section_ptr_add(lbounds_section, 2 * sizeof(unsigned long));
5432 bounds_ptr[0] = addr;
5433 bounds_ptr[1] = size;
5434 }
5435 #endif
5436 if (v) {
5437 /* local variable */
5438 sym_push(v, type, r, addr);
5439 } else {
5440 /* push local reference */
5441 vset(type, r, addr);
5442 }
5443 } else {
5444 Sym *sym;
5445
5446 sym = NULL;
5447 if (v && scope == VT_CONST) {
5448 /* see if the symbol was already defined */
5449 sym = sym_find(v);
5450 if (sym) {
5451 if (!is_compatible_types(&sym->type, type))
5452 tcc_error("incompatible types for redefinition of '%s'",
5453 get_tok_str(v, NULL));
5454 if (sym->type.t & VT_EXTERN) {
5455 /* if the variable is extern, it was not allocated */
5456 sym->type.t &= ~VT_EXTERN;
5457 /* set array size if it was ommited in extern
5458 declaration */
5459 if ((sym->type.t & VT_ARRAY) &&
5460 sym->type.ref->c < 0 &&
5461 type->ref->c >= 0)
5462 sym->type.ref->c = type->ref->c;
5463 } else {
5464 /* we accept several definitions of the same
5465 global variable. this is tricky, because we
5466 must play with the SHN_COMMON type of the symbol */
5467 /* XXX: should check if the variable was already
5468 initialized. It is incorrect to initialized it
5469 twice */
5470 /* no init data, we won't add more to the symbol */
5471 if (!has_init)
5472 goto no_alloc;
5473 }
5474 }
5475 }
5476
5477 /* allocate symbol in corresponding section */
5478 sec = ad->section;
5479 if (!sec) {
5480 if (has_init)
5481 sec = data_section;
5482 else if (tcc_state->nocommon)
5483 sec = bss_section;
5484 }
5485 if (sec) {
5486 data_offset = sec->data_offset;
5487 data_offset = (data_offset + align - 1) & -align;
5488 addr = data_offset;
5489 /* very important to increment global pointer at this time
5490 because initializers themselves can create new initializers */
5491 data_offset += size;
5492 #ifdef CONFIG_TCC_BCHECK
5493 /* add padding if bound check */
5494 if (tcc_state->do_bounds_check)
5495 data_offset++;
5496 #endif
5497 sec->data_offset = data_offset;
5498 /* allocate section space to put the data */
5499 if (sec->sh_type != SHT_NOBITS &&
5500 data_offset > sec->data_allocated)
5501 section_realloc(sec, data_offset);
5502 /* align section if needed */
5503 if (align > sec->sh_addralign)
5504 sec->sh_addralign = align;
5505 } else {
5506 addr = 0; /* avoid warning */
5507 }
5508
5509 if (v) {
5510 if (scope != VT_CONST || !sym) {
5511 sym = sym_push(v, type, r | VT_SYM, 0);
5512 sym->asm_label = asm_label;
5513 }
5514 /* update symbol definition */
5515 if (sec) {
5516 put_extern_sym(sym, sec, addr, size);
5517 } else {
5518 ElfW(Sym) *esym;
5519 /* put a common area */
5520 put_extern_sym(sym, NULL, align, size);
5521 /* XXX: find a nicer way */
5522 esym = &((ElfW(Sym) *)symtab_section->data)[sym->c];
5523 esym->st_shndx = SHN_COMMON;
5524 }
5525 } else {
5526 CValue cval;
5527
5528 /* push global reference */
5529 sym = get_sym_ref(type, sec, addr, size);
5530 cval.ul = 0;
5531 vsetc(type, VT_CONST | VT_SYM, &cval);
5532 vtop->sym = sym;
5533 }
5534 /* patch symbol weakness */
5535 if (type->t & VT_WEAK)
5536 weaken_symbol(sym);
5537 #ifdef CONFIG_TCC_BCHECK
5538 /* handles bounds now because the symbol must be defined
5539 before for the relocation */
5540 if (tcc_state->do_bounds_check) {
5541 unsigned long *bounds_ptr;
5542
5543 greloc(bounds_section, sym, bounds_section->data_offset, R_DATA_PTR);
5544 /* then add global bound info */
5545 bounds_ptr = section_ptr_add(bounds_section, 2 * sizeof(long));
5546 bounds_ptr[0] = 0; /* relocated */
5547 bounds_ptr[1] = size;
5548 }
5549 #endif
5550 }
5551 if (has_init || (type->t & VT_VLA)) {
5552 decl_initializer(type, sec, addr, 1, 0);
5553 /* restore parse state if needed */
5554 if (init_str.str) {
5555 tok_str_free(init_str.str);
5556 restore_parse_state(&saved_parse_state);
5557 }
5558 /* patch flexible array member size back to -1, */
5559 /* for possible subsequent similar declarations */
5560 if (flexible_array)
5561 flexible_array->type.ref->c = -1;
5562 }
5563 no_alloc: ;
5564 }
5565
5566 static void put_func_debug(Sym *sym)
5567 {
5568 char buf[512];
5569
5570 /* stabs info */
5571 /* XXX: we put here a dummy type */
5572 snprintf(buf, sizeof(buf), "%s:%c1",
5573 funcname, sym->type.t & VT_STATIC ? 'f' : 'F');
5574 put_stabs_r(buf, N_FUN, 0, file->line_num, 0,
5575 cur_text_section, sym->c);
5576 /* //gr gdb wants a line at the function */
5577 put_stabn(N_SLINE, 0, file->line_num, 0);
5578 last_ind = 0;
5579 last_line_num = 0;
5580 }
5581
5582 /* parse an old style function declaration list */
5583 /* XXX: check multiple parameter */
5584 static void func_decl_list(Sym *func_sym)
5585 {
5586 AttributeDef ad;
5587 int v;
5588 Sym *s;
5589 CType btype, type;
5590
5591 /* parse each declaration */
5592 while (tok != '{' && tok != ';' && tok != ',' && tok != TOK_EOF &&
5593 tok != TOK_ASM1 && tok != TOK_ASM2 && tok != TOK_ASM3) {
5594 if (!parse_btype(&btype, &ad))
5595 expect("declaration list");
5596 if (((btype.t & VT_BTYPE) == VT_ENUM ||
5597 (btype.t & VT_BTYPE) == VT_STRUCT) &&
5598 tok == ';') {
5599 /* we accept no variable after */
5600 } else {
5601 for(;;) {
5602 type = btype;
5603 type_decl(&type, &ad, &v, TYPE_DIRECT);
5604 /* find parameter in function parameter list */
5605 s = func_sym->next;
5606 while (s != NULL) {
5607 if ((s->v & ~SYM_FIELD) == v)
5608 goto found;
5609 s = s->next;
5610 }
5611 tcc_error("declaration for parameter '%s' but no such parameter",
5612 get_tok_str(v, NULL));
5613 found:
5614 /* check that no storage specifier except 'register' was given */
5615 if (type.t & VT_STORAGE)
5616 tcc_error("storage class specified for '%s'", get_tok_str(v, NULL));
5617 convert_parameter_type(&type);
5618 /* we can add the type (NOTE: it could be local to the function) */
5619 s->type = type;
5620 /* accept other parameters */
5621 if (tok == ',')
5622 next();
5623 else
5624 break;
5625 }
5626 }
5627 skip(';');
5628 }
5629 }
5630
5631 /* parse a function defined by symbol 'sym' and generate its code in
5632 'cur_text_section' */
5633 static void gen_function(Sym *sym)
5634 {
5635 int saved_nocode_wanted = nocode_wanted;
5636 nocode_wanted = 0;
5637 ind = cur_text_section->data_offset;
5638 /* NOTE: we patch the symbol size later */
5639 put_extern_sym(sym, cur_text_section, ind, 0);
5640 funcname = get_tok_str(sym->v, NULL);
5641 func_ind = ind;
5642 /* Initialize VLA state */
5643 vla_sp_loc = &vla_sp_root_loc;
5644 vla_flags = VLA_NEED_NEW_FRAME;
5645 /* put debug symbol */
5646 if (tcc_state->do_debug)
5647 put_func_debug(sym);
5648 /* push a dummy symbol to enable local sym storage */
5649 sym_push2(&local_stack, SYM_FIELD, 0, 0);
5650 gfunc_prolog(&sym->type);
5651 rsym = 0;
5652 block(NULL, NULL, NULL, NULL, 0, 0);
5653 gsym(rsym);
5654 gfunc_epilog();
5655 cur_text_section->data_offset = ind;
5656 label_pop(&global_label_stack, NULL);
5657 /* reset local stack */
5658 scope_stack_bottom = NULL;
5659 sym_pop(&local_stack, NULL);
5660 /* end of function */
5661 /* patch symbol size */
5662 ((ElfW(Sym) *)symtab_section->data)[sym->c].st_size =
5663 ind - func_ind;
5664 /* patch symbol weakness (this definition overrules any prototype) */
5665 if (sym->type.t & VT_WEAK)
5666 weaken_symbol(sym);
5667 if (tcc_state->do_debug) {
5668 put_stabn(N_FUN, 0, 0, ind - func_ind);
5669 }
5670 /* It's better to crash than to generate wrong code */
5671 cur_text_section = NULL;
5672 funcname = ""; /* for safety */
5673 func_vt.t = VT_VOID; /* for safety */
5674 ind = 0; /* for safety */
5675 nocode_wanted = saved_nocode_wanted;
5676 }
5677
5678 ST_FUNC void gen_inline_functions(void)
5679 {
5680 Sym *sym;
5681 int *str, inline_generated, i;
5682 struct InlineFunc *fn;
5683
5684 /* iterate while inline function are referenced */
5685 for(;;) {
5686 inline_generated = 0;
5687 for (i = 0; i < tcc_state->nb_inline_fns; ++i) {
5688 fn = tcc_state->inline_fns[i];
5689 sym = fn->sym;
5690 if (sym && sym->c) {
5691 /* the function was used: generate its code and
5692 convert it to a normal function */
5693 str = fn->token_str;
5694 fn->sym = NULL;
5695 if (file)
5696 pstrcpy(file->filename, sizeof file->filename, fn->filename);
5697 sym->r = VT_SYM | VT_CONST;
5698 sym->type.t &= ~VT_INLINE;
5699
5700 macro_ptr = str;
5701 next();
5702 cur_text_section = text_section;
5703 gen_function(sym);
5704 macro_ptr = NULL; /* fail safe */
5705
5706 inline_generated = 1;
5707 }
5708 }
5709 if (!inline_generated)
5710 break;
5711 }
5712 for (i = 0; i < tcc_state->nb_inline_fns; ++i) {
5713 fn = tcc_state->inline_fns[i];
5714 str = fn->token_str;
5715 tok_str_free(str);
5716 }
5717 dynarray_reset(&tcc_state->inline_fns, &tcc_state->nb_inline_fns);
5718 }
5719
5720 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
5721 static int decl0(int l, int is_for_loop_init)
5722 {
5723 int v, has_init, r;
5724 CType type, btype;
5725 Sym *sym;
5726 AttributeDef ad;
5727
5728 while (1) {
5729 if (!parse_btype(&btype, &ad)) {
5730 if (is_for_loop_init)
5731 return 0;
5732 /* skip redundant ';' */
5733 /* XXX: find more elegant solution */
5734 if (tok == ';') {
5735 next();
5736 continue;
5737 }
5738 if (l == VT_CONST &&
5739 (tok == TOK_ASM1 || tok == TOK_ASM2 || tok == TOK_ASM3)) {
5740 /* global asm block */
5741 asm_global_instr();
5742 continue;
5743 }
5744 /* special test for old K&R protos without explicit int
5745 type. Only accepted when defining global data */
5746 if (l == VT_LOCAL || tok < TOK_DEFINE)
5747 break;
5748 btype.t = VT_INT;
5749 }
5750 if (((btype.t & VT_BTYPE) == VT_ENUM ||
5751 (btype.t & VT_BTYPE) == VT_STRUCT) &&
5752 tok == ';') {
5753 /* we accept no variable after */
5754 next();
5755 continue;
5756 }
5757 while (1) { /* iterate thru each declaration */
5758 char *asm_label; // associated asm label
5759 type = btype;
5760 type_decl(&type, &ad, &v, TYPE_DIRECT);
5761 #if 0
5762 {
5763 char buf[500];
5764 type_to_str(buf, sizeof(buf), t, get_tok_str(v, NULL));
5765 printf("type = '%s'\n", buf);
5766 }
5767 #endif
5768 if ((type.t & VT_BTYPE) == VT_FUNC) {
5769 if ((type.t & VT_STATIC) && (l == VT_LOCAL)) {
5770 tcc_error("function without file scope cannot be static");
5771 }
5772 /* if old style function prototype, we accept a
5773 declaration list */
5774 sym = type.ref;
5775 if (sym->c == FUNC_OLD)
5776 func_decl_list(sym);
5777 }
5778
5779 asm_label = NULL;
5780 if (gnu_ext && (tok == TOK_ASM1 || tok == TOK_ASM2 || tok == TOK_ASM3)) {
5781 CString astr;
5782
5783 asm_label_instr(&astr);
5784 asm_label = tcc_strdup(astr.data);
5785 cstr_free(&astr);
5786
5787 /* parse one last attribute list, after asm label */
5788 parse_attribute(&ad);
5789 }
5790
5791 if (ad.weak)
5792 type.t |= VT_WEAK;
5793 #ifdef TCC_TARGET_PE
5794 if (ad.func_import)
5795 type.t |= VT_IMPORT;
5796 if (ad.func_export)
5797 type.t |= VT_EXPORT;
5798 #endif
5799 if (tok == '{') {
5800 if (l == VT_LOCAL)
5801 tcc_error("cannot use local functions");
5802 if ((type.t & VT_BTYPE) != VT_FUNC)
5803 expect("function definition");
5804
5805 /* reject abstract declarators in function definition */
5806 sym = type.ref;
5807 while ((sym = sym->next) != NULL)
5808 if (!(sym->v & ~SYM_FIELD))
5809 expect("identifier");
5810
5811 /* XXX: cannot do better now: convert extern line to static inline */
5812 if ((type.t & (VT_EXTERN | VT_INLINE)) == (VT_EXTERN | VT_INLINE))
5813 type.t = (type.t & ~VT_EXTERN) | VT_STATIC;
5814
5815 sym = sym_find(v);
5816 if (sym) {
5817 if ((sym->type.t & VT_BTYPE) != VT_FUNC)
5818 goto func_error1;
5819
5820 r = sym->type.ref->r;
5821 /* use func_call from prototype if not defined */
5822 if (FUNC_CALL(r) != FUNC_CDECL
5823 && FUNC_CALL(type.ref->r) == FUNC_CDECL)
5824 FUNC_CALL(type.ref->r) = FUNC_CALL(r);
5825
5826 /* use export from prototype */
5827 if (FUNC_EXPORT(r))
5828 FUNC_EXPORT(type.ref->r) = 1;
5829
5830 /* use static from prototype */
5831 if (sym->type.t & VT_STATIC)
5832 type.t = (type.t & ~VT_EXTERN) | VT_STATIC;
5833
5834 if (!is_compatible_types(&sym->type, &type)) {
5835 func_error1:
5836 tcc_error("incompatible types for redefinition of '%s'",
5837 get_tok_str(v, NULL));
5838 }
5839 /* if symbol is already defined, then put complete type */
5840 sym->type = type;
5841 } else {
5842 /* put function symbol */
5843 sym = global_identifier_push(v, type.t, 0);
5844 sym->type.ref = type.ref;
5845 }
5846
5847 /* static inline functions are just recorded as a kind
5848 of macro. Their code will be emitted at the end of
5849 the compilation unit only if they are used */
5850 if ((type.t & (VT_INLINE | VT_STATIC)) ==
5851 (VT_INLINE | VT_STATIC)) {
5852 TokenString func_str;
5853 int block_level;
5854 struct InlineFunc *fn;
5855 const char *filename;
5856
5857 tok_str_new(&func_str);
5858
5859 block_level = 0;
5860 for(;;) {
5861 int t;
5862 if (tok == TOK_EOF)
5863 tcc_error("unexpected end of file");
5864 tok_str_add_tok(&func_str);
5865 t = tok;
5866 next();
5867 if (t == '{') {
5868 block_level++;
5869 } else if (t == '}') {
5870 block_level--;
5871 if (block_level == 0)
5872 break;
5873 }
5874 }
5875 tok_str_add(&func_str, -1);
5876 tok_str_add(&func_str, 0);
5877 filename = file ? file->filename : "";
5878 fn = tcc_malloc(sizeof *fn + strlen(filename));
5879 strcpy(fn->filename, filename);
5880 fn->sym = sym;
5881 fn->token_str = func_str.str;
5882 dynarray_add((void ***)&tcc_state->inline_fns, &tcc_state->nb_inline_fns, fn);
5883
5884 } else {
5885 /* compute text section */
5886 cur_text_section = ad.section;
5887 if (!cur_text_section)
5888 cur_text_section = text_section;
5889 sym->r = VT_SYM | VT_CONST;
5890 gen_function(sym);
5891 }
5892 break;
5893 } else {
5894 if (btype.t & VT_TYPEDEF) {
5895 /* save typedefed type */
5896 /* XXX: test storage specifiers ? */
5897 sym = sym_push(v, &type, INT_ATTR(&ad), 0);
5898 sym->type.t |= VT_TYPEDEF;
5899 } else {
5900 r = 0;
5901 if ((type.t & VT_BTYPE) == VT_FUNC) {
5902 /* external function definition */
5903 /* specific case for func_call attribute */
5904 type.ref->r = INT_ATTR(&ad);
5905 } else if (!(type.t & VT_ARRAY)) {
5906 /* not lvalue if array */
5907 r |= lvalue_type(type.t);
5908 }
5909 has_init = (tok == '=');
5910 if (has_init && (type.t & VT_VLA))
5911 tcc_error("Variable length array cannot be initialized");
5912 if ((btype.t & VT_EXTERN) || ((type.t & VT_BTYPE) == VT_FUNC) ||
5913 ((type.t & VT_ARRAY) && (type.t & VT_STATIC) &&
5914 !has_init && l == VT_CONST && type.ref->c < 0)) {
5915 /* external variable or function */
5916 /* NOTE: as GCC, uninitialized global static
5917 arrays of null size are considered as
5918 extern */
5919 sym = external_sym(v, &type, r, asm_label);
5920
5921 if (type.t & VT_WEAK)
5922 weaken_symbol(sym);
5923
5924 if (ad.alias_target) {
5925 Section tsec;
5926 Elf32_Sym *esym;
5927 Sym *alias_target;
5928
5929 alias_target = sym_find(ad.alias_target);
5930 if (!alias_target || !alias_target->c)
5931 tcc_error("unsupported forward __alias__ attribute");
5932 esym = &((Elf32_Sym *)symtab_section->data)[alias_target->c];
5933 tsec.sh_num = esym->st_shndx;
5934 put_extern_sym2(sym, &tsec, esym->st_value, esym->st_size, 0);
5935 }
5936 } else {
5937 type.t |= (btype.t & VT_STATIC); /* Retain "static". */
5938 if (type.t & VT_STATIC)
5939 r |= VT_CONST;
5940 else
5941 r |= l;
5942 if (has_init)
5943 next();
5944 decl_initializer_alloc(&type, &ad, r, has_init, v, asm_label, l);
5945 }
5946 }
5947 if (tok != ',') {
5948 if (is_for_loop_init)
5949 return 1;
5950 skip(';');
5951 break;
5952 }
5953 next();
5954 }
5955 ad.aligned = 0;
5956 }
5957 }
5958 return 0;
5959 }
5960
5961 ST_FUNC void decl(int l)
5962 {
5963 decl0(l, 0);
5964 }
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