2 * TCC - Tiny C Compiler
4 * Copyright (c) 2001-2004 Fabrice Bellard
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.
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.
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
23 /********************************************************/
24 /* global variables */
26 /* loc : local variable index
27 ind : output code index
29 anon_sym: anonymous symbol index
31 ST_DATA
int rsym
, anon_sym
, ind
, loc
;
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 */
36 ST_DATA Section
*last_text_section
; /* to handle .previous asm directive */
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 */
44 ST_DATA Section
*symtab_section
, *strtab_section
;
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
;
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
;
58 ST_DATA
int vlas_in_scope
; /* number of VLAs that are currently in scope */
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 */
62 ST_DATA SValue __vstack
[1+VSTACK_SIZE
], *vtop
, *pvtop
;
64 ST_DATA
int const_wanted
; /* true if constant wanted */
65 ST_DATA
int nocode_wanted
; /* true if no code generation wanted for an expression */
66 ST_DATA
int global_expr
; /* true if compound literals must be allocated globally (used during initializers parsing */
67 ST_DATA CType func_vt
; /* current function return type (used by return instruction) */
68 ST_DATA
int func_var
; /* true if current function is variadic (used by return instruction) */
70 ST_DATA
int last_line_num
, last_ind
, func_ind
; /* debug last line number and pc */
71 ST_DATA
const char *funcname
;
73 ST_DATA CType char_pointer_type
, func_old_type
, int_type
, size_type
;
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
, 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_restore(void);
90 static void vla_sp_restore_root(void);
91 static int is_compatible_parameter_types(CType
*type1
, CType
*type2
);
92 static void expr_type(CType
*type
);
93 ST_FUNC
void vpush64(int ty
, unsigned long long v
);
94 ST_FUNC
void vpush(CType
*type
);
95 ST_FUNC
int gvtst(int inv
, int t
);
96 ST_FUNC
int is_btype_size(int bt
);
98 ST_INLN
int is_float(int t
)
102 return bt
== VT_LDOUBLE
|| bt
== VT_DOUBLE
|| bt
== VT_FLOAT
|| bt
== VT_QFLOAT
;
105 /* we use our own 'finite' function to avoid potential problems with
106 non standard math libs */
107 /* XXX: endianness dependent */
108 ST_FUNC
int ieee_finite(double d
)
111 memcpy(p
, &d
, sizeof(double));
112 return ((unsigned)((p
[1] | 0x800fffff) + 1)) >> 31;
115 ST_FUNC
void test_lvalue(void)
117 if (!(vtop
->r
& VT_LVAL
))
121 ST_FUNC
void check_vstack(void)
124 tcc_error("internal compiler error: vstack leak (%d)", vtop
- pvtop
);
127 /* ------------------------------------------------------------------------- */
128 /* symbol allocator */
129 static Sym
*__sym_malloc(void)
131 Sym
*sym_pool
, *sym
, *last_sym
;
134 sym_pool
= tcc_malloc(SYM_POOL_NB
* sizeof(Sym
));
135 dynarray_add(&sym_pools
, &nb_sym_pools
, sym_pool
);
137 last_sym
= sym_free_first
;
139 for(i
= 0; i
< SYM_POOL_NB
; i
++) {
140 sym
->next
= last_sym
;
144 sym_free_first
= last_sym
;
148 static inline Sym
*sym_malloc(void)
151 sym
= sym_free_first
;
153 sym
= __sym_malloc();
154 sym_free_first
= sym
->next
;
158 ST_INLN
void sym_free(Sym
*sym
)
160 sym
->next
= sym_free_first
;
161 sym_free_first
= sym
;
164 /* push, without hashing */
165 ST_FUNC Sym
*sym_push2(Sym
**ps
, int v
, int t
, long c
)
168 if (ps
== &local_stack
) {
169 for (s
= *ps
; s
&& s
!= scope_stack_bottom
; s
= s
->prev
)
170 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
&& s
->v
== v
)
171 tcc_error("incompatible types for redefinition of '%s'",
172 get_tok_str(v
, NULL
));
190 /* find a symbol and return its associated structure. 's' is the top
191 of the symbol stack */
192 ST_FUNC Sym
*sym_find2(Sym
*s
, int v
)
204 /* structure lookup */
205 ST_INLN Sym
*struct_find(int v
)
208 if ((unsigned)v
>= (unsigned)(tok_ident
- TOK_IDENT
))
210 return table_ident
[v
]->sym_struct
;
213 /* find an identifier */
214 ST_INLN Sym
*sym_find(int v
)
217 if ((unsigned)v
>= (unsigned)(tok_ident
- TOK_IDENT
))
219 return table_ident
[v
]->sym_identifier
;
222 /* push a given symbol on the symbol stack */
223 ST_FUNC Sym
*sym_push(int v
, CType
*type
, int r
, int c
)
232 s
= sym_push2(ps
, v
, type
->t
, c
);
233 s
->type
.ref
= type
->ref
;
235 /* don't record fields or anonymous symbols */
237 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
238 /* record symbol in token array */
239 ts
= table_ident
[(v
& ~SYM_STRUCT
) - TOK_IDENT
];
241 ps
= &ts
->sym_struct
;
243 ps
= &ts
->sym_identifier
;
250 /* push a global identifier */
251 ST_FUNC Sym
*global_identifier_push(int v
, int t
, int c
)
254 s
= sym_push2(&global_stack
, v
, t
, c
);
255 /* don't record anonymous symbol */
256 if (v
< SYM_FIRST_ANOM
) {
257 ps
= &table_ident
[v
- TOK_IDENT
]->sym_identifier
;
258 /* modify the top most local identifier, so that
259 sym_identifier will point to 's' when popped */
261 ps
= &(*ps
)->prev_tok
;
268 /* pop symbols until top reaches 'b' */
269 ST_FUNC
void sym_pop(Sym
**ptop
, Sym
*b
)
279 /* remove symbol in token array */
281 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
282 ts
= table_ident
[(v
& ~SYM_STRUCT
) - TOK_IDENT
];
284 ps
= &ts
->sym_struct
;
286 ps
= &ts
->sym_identifier
;
295 static void weaken_symbol(Sym
*sym
)
297 sym
->type
.t
|= VT_WEAK
;
302 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
303 esym_type
= ELFW(ST_TYPE
)(esym
->st_info
);
304 esym
->st_info
= ELFW(ST_INFO
)(STB_WEAK
, esym_type
);
308 static void apply_visibility(Sym
*sym
, CType
*type
)
310 int vis
= sym
->type
.t
& VT_VIS_MASK
;
311 int vis2
= type
->t
& VT_VIS_MASK
;
312 if (vis
== (STV_DEFAULT
<< VT_VIS_SHIFT
))
314 else if (vis2
== (STV_DEFAULT
<< VT_VIS_SHIFT
))
317 vis
= (vis
< vis2
) ? vis
: vis2
;
318 sym
->type
.t
&= ~VT_VIS_MASK
;
324 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
325 vis
>>= VT_VIS_SHIFT
;
326 esym
->st_other
= (esym
->st_other
& ~ELFW(ST_VISIBILITY
)(-1)) | vis
;
330 /* ------------------------------------------------------------------------- */
332 ST_FUNC
void swap(int *p
, int *q
)
340 static void vsetc(CType
*type
, int r
, CValue
*vc
)
344 if (vtop
>= vstack
+ (VSTACK_SIZE
- 1))
345 tcc_error("memory full (vstack)");
346 /* cannot let cpu flags if other instruction are generated. Also
347 avoid leaving VT_JMP anywhere except on the top of the stack
348 because it would complicate the code generator. */
349 if (vtop
>= vstack
) {
350 v
= vtop
->r
& VT_VALMASK
;
351 if (v
== VT_CMP
|| (v
& ~1) == VT_JMP
)
361 /* push constant of type "type" with useless value */
362 ST_FUNC
void vpush(CType
*type
)
365 vsetc(type
, VT_CONST
, &cval
);
368 /* push integer constant */
369 ST_FUNC
void vpushi(int v
)
373 vsetc(&int_type
, VT_CONST
, &cval
);
376 /* push a pointer sized constant */
377 static void vpushs(addr_t v
)
381 vsetc(&size_type
, VT_CONST
, &cval
);
384 /* push arbitrary 64bit constant */
385 ST_FUNC
void vpush64(int ty
, unsigned long long v
)
392 vsetc(&ctype
, VT_CONST
, &cval
);
395 /* push long long constant */
396 static inline void vpushll(long long v
)
398 vpush64(VT_LLONG
, v
);
401 /* push a symbol value of TYPE */
402 static inline void vpushsym(CType
*type
, Sym
*sym
)
406 vsetc(type
, VT_CONST
| VT_SYM
, &cval
);
410 /* Return a static symbol pointing to a section */
411 ST_FUNC Sym
*get_sym_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
417 sym
= global_identifier_push(v
, type
->t
| VT_STATIC
, 0);
418 sym
->type
.ref
= type
->ref
;
419 sym
->r
= VT_CONST
| VT_SYM
;
420 put_extern_sym(sym
, sec
, offset
, size
);
424 /* push a reference to a section offset by adding a dummy symbol */
425 static void vpush_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
427 vpushsym(type
, get_sym_ref(type
, sec
, offset
, size
));
430 /* define a new external reference to a symbol 'v' of type 'u' */
431 ST_FUNC Sym
*external_global_sym(int v
, CType
*type
, int r
)
437 /* push forward reference */
438 s
= global_identifier_push(v
, type
->t
| VT_EXTERN
, 0);
439 s
->type
.ref
= type
->ref
;
440 s
->r
= r
| VT_CONST
| VT_SYM
;
445 /* define a new external reference to a symbol 'v' */
446 static Sym
*external_sym(int v
, CType
*type
, int r
)
452 /* push forward reference */
453 s
= sym_push(v
, type
, r
| VT_CONST
| VT_SYM
, 0);
454 s
->type
.t
|= VT_EXTERN
;
455 } else if (s
->type
.ref
== func_old_type
.ref
) {
456 s
->type
.ref
= type
->ref
;
457 s
->r
= r
| VT_CONST
| VT_SYM
;
458 s
->type
.t
|= VT_EXTERN
;
459 } else if (!is_compatible_types(&s
->type
, type
)) {
460 tcc_error("incompatible types for redefinition of '%s'",
461 get_tok_str(v
, NULL
));
463 /* Merge some storage attributes. */
464 if (type
->t
& VT_WEAK
)
467 if (type
->t
& VT_VIS_MASK
)
468 apply_visibility(s
, type
);
473 /* push a reference to global symbol v */
474 ST_FUNC
void vpush_global_sym(CType
*type
, int v
)
476 vpushsym(type
, external_global_sym(v
, type
, 0));
479 ST_FUNC
void vset(CType
*type
, int r
, int v
)
484 vsetc(type
, r
, &cval
);
487 static void vseti(int r
, int v
)
495 ST_FUNC
void vswap(void)
498 /* cannot let cpu flags if other instruction are generated. Also
499 avoid leaving VT_JMP anywhere except on the top of the stack
500 because it would complicate the code generator. */
501 if (vtop
>= vstack
) {
502 int v
= vtop
->r
& VT_VALMASK
;
503 if (v
== VT_CMP
|| (v
& ~1) == VT_JMP
)
510 /* XXX: +2% overall speed possible with optimized memswap
512 * memswap(&vtop[0], &vtop[1], sizeof *vtop);
516 ST_FUNC
void vpushv(SValue
*v
)
518 if (vtop
>= vstack
+ (VSTACK_SIZE
- 1))
519 tcc_error("memory full (vstack)");
524 static void vdup(void)
529 /* save r to the memory stack, and mark it as being free */
530 ST_FUNC
void save_reg(int r
)
532 int l
, saved
, size
, align
;
536 /* modify all stack values */
539 for(p
=vstack
;p
<=vtop
;p
++) {
540 if ((p
->r
& VT_VALMASK
) == r
||
541 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& (p
->r2
& VT_VALMASK
) == r
)) {
542 /* must save value on stack if not already done */
544 /* NOTE: must reload 'r' because r might be equal to r2 */
545 r
= p
->r
& VT_VALMASK
;
546 /* store register in the stack */
548 if ((p
->r
& VT_LVAL
) ||
549 (!is_float(type
->t
) && (type
->t
& VT_BTYPE
) != VT_LLONG
))
550 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
551 type
= &char_pointer_type
;
555 size
= type_size(type
, &align
);
556 loc
= (loc
- size
) & -align
;
558 sv
.r
= VT_LOCAL
| VT_LVAL
;
561 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
562 /* x86 specific: need to pop fp register ST0 if saved */
564 o(0xd8dd); /* fstp %st(0) */
567 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
568 /* special long long case */
569 if ((type
->t
& VT_BTYPE
) == VT_LLONG
) {
577 /* mark that stack entry as being saved on the stack */
578 if (p
->r
& VT_LVAL
) {
579 /* also clear the bounded flag because the
580 relocation address of the function was stored in
582 p
->r
= (p
->r
& ~(VT_VALMASK
| VT_BOUNDED
)) | VT_LLOCAL
;
584 p
->r
= lvalue_type(p
->type
.t
) | VT_LOCAL
;
592 #ifdef TCC_TARGET_ARM
593 /* find a register of class 'rc2' with at most one reference on stack.
594 * If none, call get_reg(rc) */
595 ST_FUNC
int get_reg_ex(int rc
, int rc2
)
600 for(r
=0;r
<NB_REGS
;r
++) {
601 if (reg_classes
[r
] & rc2
) {
604 for(p
= vstack
; p
<= vtop
; p
++) {
605 if ((p
->r
& VT_VALMASK
) == r
||
606 (p
->r2
& VT_VALMASK
) == r
)
617 /* find a free register of class 'rc'. If none, save one register */
618 ST_FUNC
int get_reg(int rc
)
623 /* find a free register */
624 for(r
=0;r
<NB_REGS
;r
++) {
625 if (reg_classes
[r
] & rc
) {
626 for(p
=vstack
;p
<=vtop
;p
++) {
627 if ((p
->r
& VT_VALMASK
) == r
||
628 (p
->r2
& VT_VALMASK
) == r
)
636 /* no register left : free the first one on the stack (VERY
637 IMPORTANT to start from the bottom to ensure that we don't
638 spill registers used in gen_opi()) */
639 for(p
=vstack
;p
<=vtop
;p
++) {
640 /* look at second register (if long long) */
641 r
= p
->r2
& VT_VALMASK
;
642 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
))
644 r
= p
->r
& VT_VALMASK
;
645 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
)) {
651 /* Should never comes here */
655 /* save registers up to (vtop - n) stack entry */
656 ST_FUNC
void save_regs(int n
)
661 for(p
= vstack
;p
<= p1
; p
++) {
662 r
= p
->r
& VT_VALMASK
;
669 /* move register 's' (of type 't') to 'r', and flush previous value of r to memory
671 static void move_reg(int r
, int s
, int t
)
685 /* get address of vtop (vtop MUST BE an lvalue) */
686 ST_FUNC
void gaddrof(void)
688 if (vtop
->r
& VT_REF
&& !nocode_wanted
)
691 /* tricky: if saved lvalue, then we can go back to lvalue */
692 if ((vtop
->r
& VT_VALMASK
) == VT_LLOCAL
)
693 vtop
->r
= (vtop
->r
& ~(VT_VALMASK
| VT_LVAL_TYPE
)) | VT_LOCAL
| VT_LVAL
;
698 #ifdef CONFIG_TCC_BCHECK
699 /* generate lvalue bound code */
700 static void gbound(void)
705 vtop
->r
&= ~VT_MUSTBOUND
;
706 /* if lvalue, then use checking code before dereferencing */
707 if (vtop
->r
& VT_LVAL
) {
708 /* if not VT_BOUNDED value, then make one */
709 if (!(vtop
->r
& VT_BOUNDED
)) {
710 lval_type
= vtop
->r
& (VT_LVAL_TYPE
| VT_LVAL
);
711 /* must save type because we must set it to int to get pointer */
713 vtop
->type
.t
= VT_PTR
;
716 gen_bounded_ptr_add();
717 vtop
->r
|= lval_type
;
720 /* then check for dereferencing */
721 gen_bounded_ptr_deref();
726 /* store vtop a register belonging to class 'rc'. lvalues are
727 converted to values. Cannot be used if cannot be converted to
728 register value (such as structures). */
729 ST_FUNC
int gv(int rc
)
731 int r
, bit_pos
, bit_size
, size
, align
, i
;
734 /* NOTE: get_reg can modify vstack[] */
735 if (vtop
->type
.t
& VT_BITFIELD
) {
738 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
739 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
740 /* remove bit field info to avoid loops */
741 vtop
->type
.t
&= ~VT_BITFIELD
& ((1 << VT_STRUCT_SHIFT
) - 1);
742 /* cast to int to propagate signedness in following ops */
743 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
748 if((vtop
->type
.t
& VT_UNSIGNED
) ||
749 (vtop
->type
.t
& VT_BTYPE
) == VT_BOOL
)
750 type
.t
|= VT_UNSIGNED
;
752 /* generate shifts */
753 vpushi(bits
- (bit_pos
+ bit_size
));
755 vpushi(bits
- bit_size
);
756 /* NOTE: transformed to SHR if unsigned */
760 if (is_float(vtop
->type
.t
) &&
761 (vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
764 unsigned long offset
;
765 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
769 /* XXX: unify with initializers handling ? */
770 /* CPUs usually cannot use float constants, so we store them
771 generically in data segment */
772 size
= type_size(&vtop
->type
, &align
);
773 offset
= (data_section
->data_offset
+ align
- 1) & -align
;
774 data_section
->data_offset
= offset
;
775 /* XXX: not portable yet */
776 #if defined(__i386__) || defined(__x86_64__)
777 /* Zero pad x87 tenbyte long doubles */
778 if (size
== LDOUBLE_SIZE
) {
779 vtop
->c
.tab
[2] &= 0xffff;
780 #if LDOUBLE_SIZE == 16
785 ptr
= section_ptr_add(data_section
, size
);
787 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
791 ptr
[i
] = vtop
->c
.tab
[size
-1-i
];
795 ptr
[i
] = vtop
->c
.tab
[i
];
796 sym
= get_sym_ref(&vtop
->type
, data_section
, offset
, size
<< 2);
797 vtop
->r
|= VT_LVAL
| VT_SYM
;
801 #ifdef CONFIG_TCC_BCHECK
802 if (vtop
->r
& VT_MUSTBOUND
)
806 r
= vtop
->r
& VT_VALMASK
;
807 rc2
= (rc
& RC_FLOAT
) ? RC_FLOAT
: RC_INT
;
808 #ifndef TCC_TARGET_ARM64
811 #ifdef TCC_TARGET_X86_64
812 else if (rc
== RC_FRET
)
817 /* need to reload if:
819 - lvalue (need to dereference pointer)
820 - already a register, but not in the right class */
822 || (vtop
->r
& VT_LVAL
)
823 || !(reg_classes
[r
] & rc
)
824 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
825 || ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
&& !(reg_classes
[vtop
->r2
] & rc2
))
826 || ((vtop
->type
.t
& VT_BTYPE
) == VT_QFLOAT
&& !(reg_classes
[vtop
->r2
] & rc2
))
828 || ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
&& !(reg_classes
[vtop
->r2
] & rc2
))
833 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
834 if (((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) || ((vtop
->type
.t
& VT_BTYPE
) == VT_QFLOAT
)) {
835 int addr_type
= VT_LLONG
, load_size
= 8, load_type
= ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) ? VT_LLONG
: VT_DOUBLE
;
837 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
838 int addr_type
= VT_INT
, load_size
= 4, load_type
= VT_INT
;
839 unsigned long long ll
;
841 int r2
, original_type
;
842 original_type
= vtop
->type
.t
;
843 /* two register type load : expand to two words
845 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
846 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
849 vtop
->c
.i
= ll
; /* first word */
851 vtop
->r
= r
; /* save register value */
852 vpushi(ll
>> 32); /* second word */
855 if (r
>= VT_CONST
|| /* XXX: test to VT_CONST incorrect ? */
856 (vtop
->r
& VT_LVAL
)) {
857 /* We do not want to modifier the long long
858 pointer here, so the safest (and less
859 efficient) is to save all the other registers
860 in the stack. XXX: totally inefficient. */
862 /* load from memory */
863 vtop
->type
.t
= load_type
;
866 vtop
[-1].r
= r
; /* save register value */
867 /* increment pointer to get second word */
868 vtop
->type
.t
= addr_type
;
873 vtop
->type
.t
= load_type
;
878 vtop
[-1].r
= r
; /* save register value */
879 vtop
->r
= vtop
[-1].r2
;
881 /* Allocate second register. Here we rely on the fact that
882 get_reg() tries first to free r2 of an SValue. */
886 /* write second register */
888 vtop
->type
.t
= original_type
;
889 } else if ((vtop
->r
& VT_LVAL
) && !is_float(vtop
->type
.t
)) {
891 /* lvalue of scalar type : need to use lvalue type
892 because of possible cast */
895 /* compute memory access type */
896 if (vtop
->r
& VT_REF
)
897 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
902 else if (vtop
->r
& VT_LVAL_BYTE
)
904 else if (vtop
->r
& VT_LVAL_SHORT
)
906 if (vtop
->r
& VT_LVAL_UNSIGNED
)
910 /* restore wanted type */
913 /* one register type load */
918 #ifdef TCC_TARGET_C67
919 /* uses register pairs for doubles */
920 if ((vtop
->type
.t
& VT_BTYPE
) == VT_DOUBLE
)
927 /* generate vtop[-1] and vtop[0] in resp. classes rc1 and rc2 */
928 ST_FUNC
void gv2(int rc1
, int rc2
)
932 /* generate more generic register first. But VT_JMP or VT_CMP
933 values must be generated first in all cases to avoid possible
935 v
= vtop
[0].r
& VT_VALMASK
;
936 if (v
!= VT_CMP
&& (v
& ~1) != VT_JMP
&& rc1
<= rc2
) {
941 /* test if reload is needed for first register */
942 if ((vtop
[-1].r
& VT_VALMASK
) >= VT_CONST
) {
952 /* test if reload is needed for first register */
953 if ((vtop
[0].r
& VT_VALMASK
) >= VT_CONST
) {
959 #ifndef TCC_TARGET_ARM64
960 /* wrapper around RC_FRET to return a register by type */
961 static int rc_fret(int t
)
963 #ifdef TCC_TARGET_X86_64
964 if (t
== VT_LDOUBLE
) {
972 /* wrapper around REG_FRET to return a register by type */
973 static int reg_fret(int t
)
975 #ifdef TCC_TARGET_X86_64
976 if (t
== VT_LDOUBLE
) {
983 /* expand long long on stack in two int registers */
984 static void lexpand(void)
988 u
= vtop
->type
.t
& (VT_DEFSIGN
| VT_UNSIGNED
);
991 vtop
[0].r
= vtop
[-1].r2
;
992 vtop
[0].r2
= VT_CONST
;
993 vtop
[-1].r2
= VT_CONST
;
994 vtop
[0].type
.t
= VT_INT
| u
;
995 vtop
[-1].type
.t
= VT_INT
| u
;
998 #ifdef TCC_TARGET_ARM
999 /* expand long long on stack */
1000 ST_FUNC
void lexpand_nr(void)
1004 u
= vtop
->type
.t
& (VT_DEFSIGN
| VT_UNSIGNED
);
1006 vtop
->r2
= VT_CONST
;
1007 vtop
->type
.t
= VT_INT
| u
;
1008 v
=vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
);
1009 if (v
== VT_CONST
) {
1010 vtop
[-1].c
.i
= vtop
->c
.i
;
1011 vtop
->c
.i
= vtop
->c
.i
>> 32;
1013 } else if (v
== (VT_LVAL
|VT_CONST
) || v
== (VT_LVAL
|VT_LOCAL
)) {
1015 vtop
->r
= vtop
[-1].r
;
1016 } else if (v
> VT_CONST
) {
1020 vtop
->r
= vtop
[-1].r2
;
1021 vtop
[-1].r2
= VT_CONST
;
1022 vtop
[-1].type
.t
= VT_INT
| u
;
1026 /* build a long long from two ints */
1027 static void lbuild(int t
)
1029 gv2(RC_INT
, RC_INT
);
1030 vtop
[-1].r2
= vtop
[0].r
;
1031 vtop
[-1].type
.t
= t
;
1035 /* rotate n first stack elements to the bottom
1036 I1 ... In -> I2 ... In I1 [top is right]
1038 ST_FUNC
void vrotb(int n
)
1044 for(i
=-n
+1;i
!=0;i
++)
1045 vtop
[i
] = vtop
[i
+1];
1049 /* rotate the n elements before entry e towards the top
1050 I1 ... In ... -> In I1 ... I(n-1) ... [top is right]
1052 ST_FUNC
void vrote(SValue
*e
, int n
)
1058 for(i
= 0;i
< n
- 1; i
++)
1063 /* rotate n first stack elements to the top
1064 I1 ... In -> In I1 ... I(n-1) [top is right]
1066 ST_FUNC
void vrott(int n
)
1071 /* pop stack value */
1072 ST_FUNC
void vpop(void)
1075 v
= vtop
->r
& VT_VALMASK
;
1076 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
1077 /* for x86, we need to pop the FP stack */
1078 if (v
== TREG_ST0
&& !nocode_wanted
) {
1079 o(0xd8dd); /* fstp %st(0) */
1082 if (v
== VT_JMP
|| v
== VT_JMPI
) {
1083 /* need to put correct jump if && or || without test */
1089 /* convert stack entry to register and duplicate its value in another
1091 static void gv_dup(void)
1097 if ((t
& VT_BTYPE
) == VT_LLONG
) {
1104 /* stack: H L L1 H1 */
1112 /* duplicate value */
1117 #ifdef TCC_TARGET_X86_64
1118 if ((t
& VT_BTYPE
) == VT_LDOUBLE
) {
1128 load(r1
, &sv
); /* move r to r1 */
1130 /* duplicates value */
1136 /* Generate value test
1138 * Generate a test for any value (jump, comparison and integers) */
1139 ST_FUNC
int gvtst(int inv
, int t
)
1141 int v
= vtop
->r
& VT_VALMASK
;
1142 if (v
!= VT_CMP
&& v
!= VT_JMP
&& v
!= VT_JMPI
) {
1146 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
1147 /* constant jmp optimization */
1148 if ((vtop
->c
.i
!= 0) != inv
)
1153 return gtst(inv
, t
);
1156 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
1157 /* generate CPU independent (unsigned) long long operations */
1158 static void gen_opl(int op
)
1160 int t
, a
, b
, op1
, c
, i
;
1162 unsigned short reg_iret
= REG_IRET
;
1163 unsigned short reg_lret
= REG_LRET
;
1169 func
= TOK___divdi3
;
1172 func
= TOK___udivdi3
;
1175 func
= TOK___moddi3
;
1178 func
= TOK___umoddi3
;
1185 /* call generic long long function */
1186 vpush_global_sym(&func_old_type
, func
);
1191 vtop
->r2
= reg_lret
;
1204 /* stack: L1 H1 L2 H2 */
1209 vtop
[-2] = vtop
[-3];
1212 /* stack: H1 H2 L1 L2 */
1218 /* stack: H1 H2 L1 L2 ML MH */
1221 /* stack: ML MH H1 H2 L1 L2 */
1225 /* stack: ML MH H1 L2 H2 L1 */
1230 /* stack: ML MH M1 M2 */
1233 } else if (op
== '+' || op
== '-') {
1234 /* XXX: add non carry method too (for MIPS or alpha) */
1240 /* stack: H1 H2 (L1 op L2) */
1243 gen_op(op1
+ 1); /* TOK_xxxC2 */
1246 /* stack: H1 H2 (L1 op L2) */
1249 /* stack: (L1 op L2) H1 H2 */
1251 /* stack: (L1 op L2) (H1 op H2) */
1259 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
1260 t
= vtop
[-1].type
.t
;
1264 /* stack: L H shift */
1266 /* constant: simpler */
1267 /* NOTE: all comments are for SHL. the other cases are
1268 done by swaping words */
1279 if (op
!= TOK_SAR
) {
1312 /* XXX: should provide a faster fallback on x86 ? */
1315 func
= TOK___ashrdi3
;
1318 func
= TOK___lshrdi3
;
1321 func
= TOK___ashldi3
;
1327 /* compare operations */
1333 /* stack: L1 H1 L2 H2 */
1335 vtop
[-1] = vtop
[-2];
1337 /* stack: L1 L2 H1 H2 */
1340 /* when values are equal, we need to compare low words. since
1341 the jump is inverted, we invert the test too. */
1344 else if (op1
== TOK_GT
)
1346 else if (op1
== TOK_ULT
)
1348 else if (op1
== TOK_UGT
)
1353 if (op1
!= TOK_NE
) {
1357 /* generate non equal test */
1358 /* XXX: NOT PORTABLE yet */
1362 #if defined(TCC_TARGET_I386)
1363 b
= psym(0x850f, 0);
1364 #elif defined(TCC_TARGET_ARM)
1366 o(0x1A000000 | encbranch(ind
, 0, 1));
1367 #elif defined(TCC_TARGET_C67) || defined(TCC_TARGET_ARM64)
1368 tcc_error("not implemented");
1370 #error not supported
1374 /* compare low. Always unsigned */
1378 else if (op1
== TOK_LE
)
1380 else if (op1
== TOK_GT
)
1382 else if (op1
== TOK_GE
)
1393 static uint64_t gen_opic_sdiv(uint64_t a
, uint64_t b
)
1395 uint64_t x
= (a
>> 63 ? -a
: a
) / (b
>> 63 ? -b
: b
);
1396 return (a
^ b
) >> 63 ? -x
: x
;
1399 static int gen_opic_lt(uint64_t a
, uint64_t b
)
1401 return (a
^ (uint64_t)1 << 63) < (b
^ (uint64_t)1 << 63);
1404 /* handle integer constant optimizations and various machine
1406 static void gen_opic(int op
)
1408 SValue
*v1
= vtop
- 1;
1410 int t1
= v1
->type
.t
& VT_BTYPE
;
1411 int t2
= v2
->type
.t
& VT_BTYPE
;
1412 int c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1413 int c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1414 uint64_t l1
= c1
? v1
->c
.i
: 0;
1415 uint64_t l2
= c2
? v2
->c
.i
: 0;
1416 int shm
= (t1
== VT_LLONG
) ? 63 : 31;
1419 l1
= ((uint32_t)l1
|
1420 (v1
->type
.t
& VT_UNSIGNED
? 0 : -(l1
& 0x80000000)));
1422 l2
= ((uint32_t)l2
|
1423 (v2
->type
.t
& VT_UNSIGNED
? 0 : -(l2
& 0x80000000)));
1427 case '+': l1
+= l2
; break;
1428 case '-': l1
-= l2
; break;
1429 case '&': l1
&= l2
; break;
1430 case '^': l1
^= l2
; break;
1431 case '|': l1
|= l2
; break;
1432 case '*': l1
*= l2
; break;
1439 /* if division by zero, generate explicit division */
1442 tcc_error("division by zero in constant");
1446 default: l1
= gen_opic_sdiv(l1
, l2
); break;
1447 case '%': l1
= l1
- l2
* gen_opic_sdiv(l1
, l2
); break;
1448 case TOK_UDIV
: l1
= l1
/ l2
; break;
1449 case TOK_UMOD
: l1
= l1
% l2
; break;
1452 case TOK_SHL
: l1
<<= (l2
& shm
); break;
1453 case TOK_SHR
: l1
>>= (l2
& shm
); break;
1455 l1
= (l1
>> 63) ? ~(~l1
>> (l2
& shm
)) : l1
>> (l2
& shm
);
1458 case TOK_ULT
: l1
= l1
< l2
; break;
1459 case TOK_UGE
: l1
= l1
>= l2
; break;
1460 case TOK_EQ
: l1
= l1
== l2
; break;
1461 case TOK_NE
: l1
= l1
!= l2
; break;
1462 case TOK_ULE
: l1
= l1
<= l2
; break;
1463 case TOK_UGT
: l1
= l1
> l2
; break;
1464 case TOK_LT
: l1
= gen_opic_lt(l1
, l2
); break;
1465 case TOK_GE
: l1
= !gen_opic_lt(l1
, l2
); break;
1466 case TOK_LE
: l1
= !gen_opic_lt(l2
, l1
); break;
1467 case TOK_GT
: l1
= gen_opic_lt(l2
, l1
); break;
1469 case TOK_LAND
: l1
= l1
&& l2
; break;
1470 case TOK_LOR
: l1
= l1
|| l2
; break;
1477 /* if commutative ops, put c2 as constant */
1478 if (c1
&& (op
== '+' || op
== '&' || op
== '^' ||
1479 op
== '|' || op
== '*')) {
1481 c2
= c1
; //c = c1, c1 = c2, c2 = c;
1482 l2
= l1
; //l = l1, l1 = l2, l2 = l;
1484 if (!const_wanted
&&
1486 (op
== TOK_SHL
|| op
== TOK_SHR
|| op
== TOK_SAR
)) ||
1487 (l1
== -1 && op
== TOK_SAR
))) {
1488 /* treat (0 << x), (0 >> x) and (-1 >> x) as constant */
1490 } else if (!const_wanted
&&
1491 c2
&& ((l2
== 0 && (op
== '&' || op
== '*')) ||
1492 (l2
== -1 && op
== '|') ||
1493 (l2
== 0xffffffff && t2
!= VT_LLONG
&& op
== '|') ||
1494 (l2
== 1 && (op
== '%' || op
== TOK_UMOD
)))) {
1495 /* treat (x & 0), (x * 0), (x | -1) and (x % 1) as constant */
1500 } else if (c2
&& (((op
== '*' || op
== '/' || op
== TOK_UDIV
||
1503 ((op
== '+' || op
== '-' || op
== '|' || op
== '^' ||
1504 op
== TOK_SHL
|| op
== TOK_SHR
|| op
== TOK_SAR
) &&
1508 /* filter out NOP operations like x*1, x-0, x&-1... */
1510 } else if (c2
&& (op
== '*' || op
== TOK_PDIV
|| op
== TOK_UDIV
)) {
1511 /* try to use shifts instead of muls or divs */
1512 if (l2
> 0 && (l2
& (l2
- 1)) == 0) {
1521 else if (op
== TOK_PDIV
)
1527 } else if (c2
&& (op
== '+' || op
== '-') &&
1528 (((vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
))
1529 || (vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
)) == VT_LOCAL
)) {
1530 /* symbol + constant case */
1537 if (!nocode_wanted
) {
1538 /* call low level op generator */
1539 if (t1
== VT_LLONG
|| t2
== VT_LLONG
||
1540 (PTR_SIZE
== 8 && (t1
== VT_PTR
|| t2
== VT_PTR
)))
1551 /* generate a floating point operation with constant propagation */
1552 static void gen_opif(int op
)
1560 /* currently, we cannot do computations with forward symbols */
1561 c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1562 c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1564 if (v1
->type
.t
== VT_FLOAT
) {
1567 } else if (v1
->type
.t
== VT_DOUBLE
) {
1575 /* NOTE: we only do constant propagation if finite number (not
1576 NaN or infinity) (ANSI spec) */
1577 if (!ieee_finite(f1
) || !ieee_finite(f2
))
1581 case '+': f1
+= f2
; break;
1582 case '-': f1
-= f2
; break;
1583 case '*': f1
*= f2
; break;
1587 tcc_error("division by zero in constant");
1592 /* XXX: also handles tests ? */
1596 /* XXX: overflow test ? */
1597 if (v1
->type
.t
== VT_FLOAT
) {
1599 } else if (v1
->type
.t
== VT_DOUBLE
) {
1607 if (!nocode_wanted
) {
1615 static int pointed_size(CType
*type
)
1618 return type_size(pointed_type(type
), &align
);
1621 static void vla_runtime_pointed_size(CType
*type
)
1624 vla_runtime_type_size(pointed_type(type
), &align
);
1627 static inline int is_null_pointer(SValue
*p
)
1629 if ((p
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
1631 return ((p
->type
.t
& VT_BTYPE
) == VT_INT
&& (uint32_t)p
->c
.i
== 0) ||
1632 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& p
->c
.i
== 0) ||
1633 ((p
->type
.t
& VT_BTYPE
) == VT_PTR
&&
1634 (PTR_SIZE
== 4 ? (uint32_t)p
->c
.i
== 0 : p
->c
.i
== 0));
1637 static inline int is_integer_btype(int bt
)
1639 return (bt
== VT_BYTE
|| bt
== VT_SHORT
||
1640 bt
== VT_INT
|| bt
== VT_LLONG
);
1643 /* check types for comparison or subtraction of pointers */
1644 static void check_comparison_pointer_types(SValue
*p1
, SValue
*p2
, int op
)
1646 CType
*type1
, *type2
, tmp_type1
, tmp_type2
;
1649 /* null pointers are accepted for all comparisons as gcc */
1650 if (is_null_pointer(p1
) || is_null_pointer(p2
))
1654 bt1
= type1
->t
& VT_BTYPE
;
1655 bt2
= type2
->t
& VT_BTYPE
;
1656 /* accept comparison between pointer and integer with a warning */
1657 if ((is_integer_btype(bt1
) || is_integer_btype(bt2
)) && op
!= '-') {
1658 if (op
!= TOK_LOR
&& op
!= TOK_LAND
)
1659 tcc_warning("comparison between pointer and integer");
1663 /* both must be pointers or implicit function pointers */
1664 if (bt1
== VT_PTR
) {
1665 type1
= pointed_type(type1
);
1666 } else if (bt1
!= VT_FUNC
)
1667 goto invalid_operands
;
1669 if (bt2
== VT_PTR
) {
1670 type2
= pointed_type(type2
);
1671 } else if (bt2
!= VT_FUNC
) {
1673 tcc_error("invalid operands to binary %s", get_tok_str(op
, NULL
));
1675 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
1676 (type2
->t
& VT_BTYPE
) == VT_VOID
)
1680 tmp_type1
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1681 tmp_type2
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1682 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
1683 /* gcc-like error if '-' is used */
1685 goto invalid_operands
;
1687 tcc_warning("comparison of distinct pointer types lacks a cast");
1691 /* generic gen_op: handles types problems */
1692 ST_FUNC
void gen_op(int op
)
1694 int u
, t1
, t2
, bt1
, bt2
, t
;
1697 t1
= vtop
[-1].type
.t
;
1698 t2
= vtop
[0].type
.t
;
1699 bt1
= t1
& VT_BTYPE
;
1700 bt2
= t2
& VT_BTYPE
;
1702 if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
1703 /* at least one operand is a pointer */
1704 /* relationnal op: must be both pointers */
1705 if (op
>= TOK_ULT
&& op
<= TOK_LOR
) {
1706 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1707 /* pointers are handled are unsigned */
1708 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1709 t
= VT_LLONG
| VT_UNSIGNED
;
1711 t
= VT_INT
| VT_UNSIGNED
;
1715 /* if both pointers, then it must be the '-' op */
1716 if (bt1
== VT_PTR
&& bt2
== VT_PTR
) {
1718 tcc_error("cannot use pointers here");
1719 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1720 /* XXX: check that types are compatible */
1721 if (vtop
[-1].type
.t
& VT_VLA
) {
1722 vla_runtime_pointed_size(&vtop
[-1].type
);
1724 vpushi(pointed_size(&vtop
[-1].type
));
1728 /* set to integer type */
1729 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1730 vtop
->type
.t
= VT_LLONG
;
1732 vtop
->type
.t
= VT_INT
;
1737 /* exactly one pointer : must be '+' or '-'. */
1738 if (op
!= '-' && op
!= '+')
1739 tcc_error("cannot use pointers here");
1740 /* Put pointer as first operand */
1741 if (bt2
== VT_PTR
) {
1745 type1
= vtop
[-1].type
;
1746 type1
.t
&= ~VT_ARRAY
;
1747 if (vtop
[-1].type
.t
& VT_VLA
)
1748 vla_runtime_pointed_size(&vtop
[-1].type
);
1750 u
= pointed_size(&vtop
[-1].type
);
1752 tcc_error("unknown array element size");
1753 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1756 /* XXX: cast to int ? (long long case) */
1762 /* #ifdef CONFIG_TCC_BCHECK
1763 The main reason to removing this code:
1770 fprintf(stderr, "v+i-j = %p\n", v+i-j);
1771 fprintf(stderr, "v+(i-j) = %p\n", v+(i-j));
1773 When this code is on. then the output looks like
1775 v+(i-j) = 0xbff84000
1777 /* if evaluating constant expression, no code should be
1778 generated, so no bound check */
1779 if (tcc_state
->do_bounds_check
&& !const_wanted
) {
1780 /* if bounded pointers, we generate a special code to
1787 gen_bounded_ptr_add();
1793 /* put again type if gen_opic() swaped operands */
1796 } else if (is_float(bt1
) || is_float(bt2
)) {
1797 /* compute bigger type and do implicit casts */
1798 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
1800 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
1805 /* floats can only be used for a few operations */
1806 if (op
!= '+' && op
!= '-' && op
!= '*' && op
!= '/' &&
1807 (op
< TOK_ULT
|| op
> TOK_GT
))
1808 tcc_error("invalid operands for binary operation");
1810 } else if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
) {
1811 t
= bt1
== VT_LLONG
? VT_LLONG
: VT_INT
;
1812 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (t
| VT_UNSIGNED
))
1815 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
1816 /* cast to biggest op */
1818 /* convert to unsigned if it does not fit in a long long */
1819 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
1820 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
1823 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
1824 tcc_error("comparison of struct");
1826 /* integer operations */
1828 /* convert to unsigned if it does not fit in an integer */
1829 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
1830 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
1833 /* XXX: currently, some unsigned operations are explicit, so
1834 we modify them here */
1835 if (t
& VT_UNSIGNED
) {
1842 else if (op
== TOK_LT
)
1844 else if (op
== TOK_GT
)
1846 else if (op
== TOK_LE
)
1848 else if (op
== TOK_GE
)
1855 /* special case for shifts and long long: we keep the shift as
1857 if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
)
1864 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
1865 /* relationnal op: the result is an int */
1866 vtop
->type
.t
= VT_INT
;
1871 // Make sure that we have converted to an rvalue:
1872 if (vtop
->r
& VT_LVAL
&& !nocode_wanted
)
1873 gv(is_float(vtop
->type
.t
& VT_BTYPE
) ? RC_FLOAT
: RC_INT
);
1876 #ifndef TCC_TARGET_ARM
1877 /* generic itof for unsigned long long case */
1878 static void gen_cvt_itof1(int t
)
1880 #ifdef TCC_TARGET_ARM64
1883 if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
1884 (VT_LLONG
| VT_UNSIGNED
)) {
1887 vpush_global_sym(&func_old_type
, TOK___floatundisf
);
1888 #if LDOUBLE_SIZE != 8
1889 else if (t
== VT_LDOUBLE
)
1890 vpush_global_sym(&func_old_type
, TOK___floatundixf
);
1893 vpush_global_sym(&func_old_type
, TOK___floatundidf
);
1897 vtop
->r
= reg_fret(t
);
1905 /* generic ftoi for unsigned long long case */
1906 static void gen_cvt_ftoi1(int t
)
1908 #ifdef TCC_TARGET_ARM64
1913 if (t
== (VT_LLONG
| VT_UNSIGNED
)) {
1914 /* not handled natively */
1915 st
= vtop
->type
.t
& VT_BTYPE
;
1917 vpush_global_sym(&func_old_type
, TOK___fixunssfdi
);
1918 #if LDOUBLE_SIZE != 8
1919 else if (st
== VT_LDOUBLE
)
1920 vpush_global_sym(&func_old_type
, TOK___fixunsxfdi
);
1923 vpush_global_sym(&func_old_type
, TOK___fixunsdfdi
);
1928 vtop
->r2
= REG_LRET
;
1935 /* force char or short cast */
1936 static void force_charshort_cast(int t
)
1940 /* XXX: add optimization if lvalue : just change type and offset */
1945 if (t
& VT_UNSIGNED
) {
1946 vpushi((1 << bits
) - 1);
1952 /* result must be signed or the SAR is converted to an SHL
1953 This was not the case when "t" was a signed short
1954 and the last value on the stack was an unsigned int */
1955 vtop
->type
.t
&= ~VT_UNSIGNED
;
1961 /* cast 'vtop' to 'type'. Casting to bitfields is forbidden. */
1962 static void gen_cast(CType
*type
)
1964 int sbt
, dbt
, sf
, df
, c
, p
;
1966 /* special delayed cast for char/short */
1967 /* XXX: in some cases (multiple cascaded casts), it may still
1969 if (vtop
->r
& VT_MUSTCAST
) {
1970 vtop
->r
&= ~VT_MUSTCAST
;
1971 force_charshort_cast(vtop
->type
.t
);
1974 /* bitfields first get cast to ints */
1975 if (vtop
->type
.t
& VT_BITFIELD
&& !nocode_wanted
) {
1979 dbt
= type
->t
& (VT_BTYPE
| VT_UNSIGNED
);
1980 sbt
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
1985 c
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1986 p
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
);
1988 /* constant case: we can do it now */
1989 /* XXX: in ISOC, cannot do it if error in convert */
1990 if (sbt
== VT_FLOAT
)
1991 vtop
->c
.ld
= vtop
->c
.f
;
1992 else if (sbt
== VT_DOUBLE
)
1993 vtop
->c
.ld
= vtop
->c
.d
;
1996 if ((sbt
& VT_BTYPE
) == VT_LLONG
) {
1997 if ((sbt
& VT_UNSIGNED
) || !(vtop
->c
.i
>> 63))
1998 vtop
->c
.ld
= vtop
->c
.i
;
2000 vtop
->c
.ld
= -(long double)-vtop
->c
.i
;
2002 if ((sbt
& VT_UNSIGNED
) || !(vtop
->c
.i
>> 31))
2003 vtop
->c
.ld
= (uint32_t)vtop
->c
.i
;
2005 vtop
->c
.ld
= -(long double)-(uint32_t)vtop
->c
.i
;
2008 if (dbt
== VT_FLOAT
)
2009 vtop
->c
.f
= (float)vtop
->c
.ld
;
2010 else if (dbt
== VT_DOUBLE
)
2011 vtop
->c
.d
= (double)vtop
->c
.ld
;
2012 } else if (sf
&& dbt
== (VT_LLONG
|VT_UNSIGNED
)) {
2013 vtop
->c
.i
= vtop
->c
.ld
;
2014 } else if (sf
&& dbt
== VT_BOOL
) {
2015 vtop
->c
.i
= (vtop
->c
.ld
!= 0);
2018 vtop
->c
.i
= vtop
->c
.ld
;
2019 else if (sbt
== (VT_LLONG
|VT_UNSIGNED
))
2021 else if (sbt
& VT_UNSIGNED
)
2022 vtop
->c
.i
= (uint32_t)vtop
->c
.i
;
2023 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2024 else if (sbt
== VT_PTR
)
2027 else if (sbt
!= VT_LLONG
)
2028 vtop
->c
.i
= ((uint32_t)vtop
->c
.i
|
2029 -(vtop
->c
.i
& 0x80000000));
2031 if (dbt
== (VT_LLONG
|VT_UNSIGNED
))
2033 else if (dbt
== VT_BOOL
)
2034 vtop
->c
.i
= (vtop
->c
.i
!= 0);
2035 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2036 else if (dbt
== VT_PTR
)
2039 else if (dbt
!= VT_LLONG
) {
2040 uint32_t m
= ((dbt
& VT_BTYPE
) == VT_BYTE
? 0xff :
2041 (dbt
& VT_BTYPE
) == VT_SHORT
? 0xffff :
2044 if (!(dbt
& VT_UNSIGNED
))
2045 vtop
->c
.i
|= -(vtop
->c
.i
& ((m
>> 1) + 1));
2048 } else if (p
&& dbt
== VT_BOOL
) {
2051 } else if (!nocode_wanted
) {
2052 /* non constant case: generate code */
2054 /* convert from fp to fp */
2057 /* convert int to fp */
2060 /* convert fp to int */
2061 if (dbt
== VT_BOOL
) {
2065 /* we handle char/short/etc... with generic code */
2066 if (dbt
!= (VT_INT
| VT_UNSIGNED
) &&
2067 dbt
!= (VT_LLONG
| VT_UNSIGNED
) &&
2071 if (dbt
== VT_INT
&& (type
->t
& (VT_BTYPE
| VT_UNSIGNED
)) != dbt
) {
2072 /* additional cast for char/short... */
2077 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
2078 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
) {
2079 if ((sbt
& VT_BTYPE
) != VT_LLONG
&& !nocode_wanted
) {
2080 /* scalar to long long */
2081 /* machine independent conversion */
2083 /* generate high word */
2084 if (sbt
== (VT_INT
| VT_UNSIGNED
)) {
2088 if (sbt
== VT_PTR
) {
2089 /* cast from pointer to int before we apply
2090 shift operation, which pointers don't support*/
2091 gen_cast(&int_type
);
2097 /* patch second register */
2098 vtop
[-1].r2
= vtop
->r
;
2102 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
||
2103 (dbt
& VT_BTYPE
) == VT_PTR
||
2104 (dbt
& VT_BTYPE
) == VT_FUNC
) {
2105 if ((sbt
& VT_BTYPE
) != VT_LLONG
&&
2106 (sbt
& VT_BTYPE
) != VT_PTR
&&
2107 (sbt
& VT_BTYPE
) != VT_FUNC
&& !nocode_wanted
) {
2108 /* need to convert from 32bit to 64bit */
2110 if (sbt
!= (VT_INT
| VT_UNSIGNED
)) {
2111 #if defined(TCC_TARGET_ARM64)
2113 #elif defined(TCC_TARGET_X86_64)
2115 /* x86_64 specific: movslq */
2117 o(0xc0 + (REG_VALUE(r
) << 3) + REG_VALUE(r
));
2124 } else if (dbt
== VT_BOOL
) {
2125 /* scalar to bool */
2128 } else if ((dbt
& VT_BTYPE
) == VT_BYTE
||
2129 (dbt
& VT_BTYPE
) == VT_SHORT
) {
2130 if (sbt
== VT_PTR
) {
2131 vtop
->type
.t
= VT_INT
;
2132 tcc_warning("nonportable conversion from pointer to char/short");
2134 force_charshort_cast(dbt
);
2135 } else if ((dbt
& VT_BTYPE
) == VT_INT
) {
2137 if (sbt
== VT_LLONG
&& !nocode_wanted
) {
2138 /* from long long: just take low order word */
2142 /* if lvalue and single word type, nothing to do because
2143 the lvalue already contains the real type size (see
2144 VT_LVAL_xxx constants) */
2147 } else if ((dbt
& VT_BTYPE
) == VT_PTR
&& !(vtop
->r
& VT_LVAL
)) {
2148 /* if we are casting between pointer types,
2149 we must update the VT_LVAL_xxx size */
2150 vtop
->r
= (vtop
->r
& ~VT_LVAL_TYPE
)
2151 | (lvalue_type(type
->ref
->type
.t
) & VT_LVAL_TYPE
);
2156 /* return type size as known at compile time. Put alignment at 'a' */
2157 ST_FUNC
int type_size(CType
*type
, int *a
)
2162 bt
= type
->t
& VT_BTYPE
;
2163 if (bt
== VT_STRUCT
) {
2168 } else if (bt
== VT_PTR
) {
2169 if (type
->t
& VT_ARRAY
) {
2173 ts
= type_size(&s
->type
, a
);
2175 if (ts
< 0 && s
->c
< 0)
2183 } else if (bt
== VT_LDOUBLE
) {
2185 return LDOUBLE_SIZE
;
2186 } else if (bt
== VT_DOUBLE
|| bt
== VT_LLONG
) {
2187 #ifdef TCC_TARGET_I386
2188 #ifdef TCC_TARGET_PE
2193 #elif defined(TCC_TARGET_ARM)
2203 } else if (bt
== VT_INT
|| bt
== VT_FLOAT
) {
2206 } else if (bt
== VT_SHORT
) {
2209 } else if (bt
== VT_QLONG
|| bt
== VT_QFLOAT
) {
2212 } else if (bt
== VT_ENUM
) {
2214 /* Enums might be incomplete, so don't just return '4' here. */
2215 return type
->ref
->c
;
2217 /* char, void, function, _Bool */
2223 /* push type size as known at runtime time on top of value stack. Put
2225 ST_FUNC
void vla_runtime_type_size(CType
*type
, int *a
)
2227 if (type
->t
& VT_VLA
) {
2228 vset(&int_type
, VT_LOCAL
|VT_LVAL
, type
->ref
->c
);
2230 vpushi(type_size(type
, a
));
2234 static void vla_sp_restore(void) {
2235 if (vlas_in_scope
) {
2236 gen_vla_sp_restore(vla_sp_loc
);
2240 static void vla_sp_restore_root(void) {
2241 if (vlas_in_scope
) {
2242 gen_vla_sp_restore(vla_sp_root_loc
);
2246 /* return the pointed type of t */
2247 static inline CType
*pointed_type(CType
*type
)
2249 return &type
->ref
->type
;
2252 /* modify type so that its it is a pointer to type. */
2253 ST_FUNC
void mk_pointer(CType
*type
)
2256 s
= sym_push(SYM_FIELD
, type
, 0, -1);
2257 type
->t
= VT_PTR
| (type
->t
& ~VT_TYPE
);
2261 /* compare function types. OLD functions match any new functions */
2262 static int is_compatible_func(CType
*type1
, CType
*type2
)
2268 if (!is_compatible_types(&s1
->type
, &s2
->type
))
2270 /* check func_call */
2271 if (s1
->a
.func_call
!= s2
->a
.func_call
)
2273 /* XXX: not complete */
2274 if (s1
->c
== FUNC_OLD
|| s2
->c
== FUNC_OLD
)
2278 while (s1
!= NULL
) {
2281 if (!is_compatible_parameter_types(&s1
->type
, &s2
->type
))
2291 /* return true if type1 and type2 are the same. If unqualified is
2292 true, qualifiers on the types are ignored.
2294 - enums are not checked as gcc __builtin_types_compatible_p ()
2296 static int compare_types(CType
*type1
, CType
*type2
, int unqualified
)
2300 t1
= type1
->t
& VT_TYPE
;
2301 t2
= type2
->t
& VT_TYPE
;
2303 /* strip qualifiers before comparing */
2304 t1
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2305 t2
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2307 /* Default Vs explicit signedness only matters for char */
2308 if ((t1
& VT_BTYPE
) != VT_BYTE
) {
2312 /* XXX: bitfields ? */
2315 /* test more complicated cases */
2316 bt1
= t1
& VT_BTYPE
;
2317 if (bt1
== VT_PTR
) {
2318 type1
= pointed_type(type1
);
2319 type2
= pointed_type(type2
);
2320 return is_compatible_types(type1
, type2
);
2321 } else if (bt1
== VT_STRUCT
) {
2322 return (type1
->ref
== type2
->ref
);
2323 } else if (bt1
== VT_FUNC
) {
2324 return is_compatible_func(type1
, type2
);
2330 /* return true if type1 and type2 are exactly the same (including
2333 static int is_compatible_types(CType
*type1
, CType
*type2
)
2335 return compare_types(type1
,type2
,0);
2338 /* return true if type1 and type2 are the same (ignoring qualifiers).
2340 static int is_compatible_parameter_types(CType
*type1
, CType
*type2
)
2342 return compare_types(type1
,type2
,1);
2345 /* print a type. If 'varstr' is not NULL, then the variable is also
2346 printed in the type */
2348 /* XXX: add array and function pointers */
2349 static void type_to_str(char *buf
, int buf_size
,
2350 CType
*type
, const char *varstr
)
2357 t
= type
->t
& VT_TYPE
;
2360 if (t
& VT_CONSTANT
)
2361 pstrcat(buf
, buf_size
, "const ");
2362 if (t
& VT_VOLATILE
)
2363 pstrcat(buf
, buf_size
, "volatile ");
2364 if ((t
& (VT_DEFSIGN
| VT_UNSIGNED
)) == (VT_DEFSIGN
| VT_UNSIGNED
))
2365 pstrcat(buf
, buf_size
, "unsigned ");
2366 else if (t
& VT_DEFSIGN
)
2367 pstrcat(buf
, buf_size
, "signed ");
2397 tstr
= "long double";
2399 pstrcat(buf
, buf_size
, tstr
);
2403 if (bt
== VT_STRUCT
)
2407 pstrcat(buf
, buf_size
, tstr
);
2408 v
= type
->ref
->v
& ~SYM_STRUCT
;
2409 if (v
>= SYM_FIRST_ANOM
)
2410 pstrcat(buf
, buf_size
, "<anonymous>");
2412 pstrcat(buf
, buf_size
, get_tok_str(v
, NULL
));
2416 type_to_str(buf
, buf_size
, &s
->type
, varstr
);
2417 pstrcat(buf
, buf_size
, "(");
2419 while (sa
!= NULL
) {
2420 type_to_str(buf1
, sizeof(buf1
), &sa
->type
, NULL
);
2421 pstrcat(buf
, buf_size
, buf1
);
2424 pstrcat(buf
, buf_size
, ", ");
2426 pstrcat(buf
, buf_size
, ")");
2431 snprintf(buf1
, sizeof(buf1
), "%s[%ld]", varstr
? varstr
: "", s
->c
);
2432 type_to_str(buf
, buf_size
, &s
->type
, buf1
);
2435 pstrcpy(buf1
, sizeof(buf1
), "*");
2436 if (t
& VT_CONSTANT
)
2437 pstrcat(buf1
, buf_size
, "const ");
2438 if (t
& VT_VOLATILE
)
2439 pstrcat(buf1
, buf_size
, "volatile ");
2441 pstrcat(buf1
, sizeof(buf1
), varstr
);
2442 type_to_str(buf
, buf_size
, &s
->type
, buf1
);
2446 pstrcat(buf
, buf_size
, " ");
2447 pstrcat(buf
, buf_size
, varstr
);
2452 /* verify type compatibility to store vtop in 'dt' type, and generate
2454 static void gen_assign_cast(CType
*dt
)
2456 CType
*st
, *type1
, *type2
, tmp_type1
, tmp_type2
;
2457 char buf1
[256], buf2
[256];
2460 st
= &vtop
->type
; /* source type */
2461 dbt
= dt
->t
& VT_BTYPE
;
2462 sbt
= st
->t
& VT_BTYPE
;
2463 if (sbt
== VT_VOID
|| dbt
== VT_VOID
) {
2464 if (sbt
== VT_VOID
&& dbt
== VT_VOID
)
2466 It is Ok if both are void
2472 gcc accepts this program
2475 tcc_error("cannot cast from/to void");
2477 if (dt
->t
& VT_CONSTANT
)
2478 tcc_warning("assignment of read-only location");
2481 /* special cases for pointers */
2482 /* '0' can also be a pointer */
2483 if (is_null_pointer(vtop
))
2485 /* accept implicit pointer to integer cast with warning */
2486 if (is_integer_btype(sbt
)) {
2487 tcc_warning("assignment makes pointer from integer without a cast");
2490 type1
= pointed_type(dt
);
2491 /* a function is implicitely a function pointer */
2492 if (sbt
== VT_FUNC
) {
2493 if ((type1
->t
& VT_BTYPE
) != VT_VOID
&&
2494 !is_compatible_types(pointed_type(dt
), st
))
2495 tcc_warning("assignment from incompatible pointer type");
2500 type2
= pointed_type(st
);
2501 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
2502 (type2
->t
& VT_BTYPE
) == VT_VOID
) {
2503 /* void * can match anything */
2505 /* exact type match, except for unsigned */
2508 tmp_type1
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
|
2510 tmp_type2
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
|
2512 if (!is_compatible_types(&tmp_type1
, &tmp_type2
))
2513 tcc_warning("assignment from incompatible pointer type");
2515 /* check const and volatile */
2516 if ((!(type1
->t
& VT_CONSTANT
) && (type2
->t
& VT_CONSTANT
)) ||
2517 (!(type1
->t
& VT_VOLATILE
) && (type2
->t
& VT_VOLATILE
)))
2518 tcc_warning("assignment discards qualifiers from pointer target type");
2524 if (sbt
== VT_PTR
|| sbt
== VT_FUNC
) {
2525 tcc_warning("assignment makes integer from pointer without a cast");
2527 /* XXX: more tests */
2532 tmp_type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2533 tmp_type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2534 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
2536 type_to_str(buf1
, sizeof(buf1
), st
, NULL
);
2537 type_to_str(buf2
, sizeof(buf2
), dt
, NULL
);
2538 tcc_error("cannot cast '%s' to '%s'", buf1
, buf2
);
2546 /* store vtop in lvalue pushed on stack */
2547 ST_FUNC
void vstore(void)
2549 int sbt
, dbt
, ft
, r
, t
, size
, align
, bit_size
, bit_pos
, rc
, delayed_cast
;
2551 ft
= vtop
[-1].type
.t
;
2552 sbt
= vtop
->type
.t
& VT_BTYPE
;
2553 dbt
= ft
& VT_BTYPE
;
2554 if ((((sbt
== VT_INT
|| sbt
== VT_SHORT
) && dbt
== VT_BYTE
) ||
2555 (sbt
== VT_INT
&& dbt
== VT_SHORT
))
2556 && !(vtop
->type
.t
& VT_BITFIELD
)) {
2557 /* optimize char/short casts */
2558 delayed_cast
= VT_MUSTCAST
;
2559 vtop
->type
.t
= (ft
& VT_TYPE
& ~VT_BITFIELD
&
2560 ((1 << VT_STRUCT_SHIFT
) - 1));
2561 /* XXX: factorize */
2562 if (ft
& VT_CONSTANT
)
2563 tcc_warning("assignment of read-only location");
2566 if (!(ft
& VT_BITFIELD
))
2567 gen_assign_cast(&vtop
[-1].type
);
2570 if (sbt
== VT_STRUCT
) {
2571 /* if structure, only generate pointer */
2572 /* structure assignment : generate memcpy */
2573 /* XXX: optimize if small size */
2574 if (!nocode_wanted
) {
2575 size
= type_size(&vtop
->type
, &align
);
2579 vtop
->type
.t
= VT_PTR
;
2582 /* address of memcpy() */
2585 vpush_global_sym(&func_old_type
, TOK_memcpy8
);
2586 else if(!(align
& 3))
2587 vpush_global_sym(&func_old_type
, TOK_memcpy4
);
2590 /* Use memmove, rather than memcpy, as dest and src may be same: */
2591 vpush_global_sym(&func_old_type
, TOK_memmove
);
2596 vtop
->type
.t
= VT_PTR
;
2605 /* leave source on stack */
2606 } else if (ft
& VT_BITFIELD
) {
2607 /* bitfield store handling */
2609 /* save lvalue as expression result (example: s.b = s.a = n;) */
2610 vdup(), vtop
[-1] = vtop
[-2];
2612 bit_pos
= (ft
>> VT_STRUCT_SHIFT
) & 0x3f;
2613 bit_size
= (ft
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
2614 /* remove bit field info to avoid loops */
2615 vtop
[-1].type
.t
= ft
& ~VT_BITFIELD
& ((1 << VT_STRUCT_SHIFT
) - 1);
2617 if((ft
& VT_BTYPE
) == VT_BOOL
) {
2618 gen_cast(&vtop
[-1].type
);
2619 vtop
[-1].type
.t
= (vtop
[-1].type
.t
& ~VT_BTYPE
) | (VT_BYTE
| VT_UNSIGNED
);
2622 /* duplicate destination */
2624 vtop
[-1] = vtop
[-2];
2626 /* mask and shift source */
2627 if((ft
& VT_BTYPE
) != VT_BOOL
) {
2628 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2629 vpushll((1ULL << bit_size
) - 1ULL);
2631 vpushi((1 << bit_size
) - 1);
2637 /* load destination, mask and or with source */
2639 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2640 vpushll(~(((1ULL << bit_size
) - 1ULL) << bit_pos
));
2642 vpushi(~(((1 << bit_size
) - 1) << bit_pos
));
2648 /* ... and discard */
2652 if (!nocode_wanted
) {
2653 #ifdef CONFIG_TCC_BCHECK
2654 /* bound check case */
2655 if (vtop
[-1].r
& VT_MUSTBOUND
) {
2664 #ifdef TCC_TARGET_X86_64
2665 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
2667 } else if ((ft
& VT_BTYPE
) == VT_QFLOAT
) {
2672 r
= gv(rc
); /* generate value */
2673 /* if lvalue was saved on stack, must read it */
2674 if ((vtop
[-1].r
& VT_VALMASK
) == VT_LLOCAL
) {
2676 t
= get_reg(RC_INT
);
2677 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2682 sv
.r
= VT_LOCAL
| VT_LVAL
;
2683 sv
.c
.i
= vtop
[-1].c
.i
;
2685 vtop
[-1].r
= t
| VT_LVAL
;
2687 /* two word case handling : store second register at word + 4 (or +8 for x86-64) */
2688 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2689 if (((ft
& VT_BTYPE
) == VT_QLONG
) || ((ft
& VT_BTYPE
) == VT_QFLOAT
)) {
2690 int addr_type
= VT_LLONG
, load_size
= 8, load_type
= ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) ? VT_LLONG
: VT_DOUBLE
;
2692 if ((ft
& VT_BTYPE
) == VT_LLONG
) {
2693 int addr_type
= VT_INT
, load_size
= 4, load_type
= VT_INT
;
2695 vtop
[-1].type
.t
= load_type
;
2698 /* convert to int to increment easily */
2699 vtop
->type
.t
= addr_type
;
2705 vtop
[-1].type
.t
= load_type
;
2706 /* XXX: it works because r2 is spilled last ! */
2707 store(vtop
->r2
, vtop
- 1);
2713 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
2714 vtop
->r
|= delayed_cast
;
2718 /* post defines POST/PRE add. c is the token ++ or -- */
2719 ST_FUNC
void inc(int post
, int c
)
2722 vdup(); /* save lvalue */
2725 gv_dup(); /* duplicate value */
2727 vdup(); /* duplicate value */
2732 vpushi(c
- TOK_MID
);
2734 vstore(); /* store value */
2736 vpop(); /* if post op, return saved value */
2739 /* Parse GNUC __attribute__ extension. Currently, the following
2740 extensions are recognized:
2741 - aligned(n) : set data/function alignment.
2742 - packed : force data alignment to 1
2743 - section(x) : generate data/code in this section.
2744 - unused : currently ignored, but may be used someday.
2745 - regparm(n) : pass function parameters in registers (i386 only)
2747 static void parse_attribute(AttributeDef
*ad
)
2751 while (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
) {
2755 while (tok
!= ')') {
2756 if (tok
< TOK_IDENT
)
2757 expect("attribute name");
2765 expect("section name");
2766 ad
->section
= find_section(tcc_state
, (char *)tokc
.str
.data
);
2774 expect("alias(\"target\")");
2775 ad
->alias_target
= /* save string as token, for later */
2776 tok_alloc((char*)tokc
.str
.data
, tokc
.str
.size
-1)->tok
;
2780 case TOK_VISIBILITY1
:
2781 case TOK_VISIBILITY2
:
2784 expect("visibility(\"default|hidden|internal|protected\")");
2785 if (!strcmp (tokc
.str
.data
, "default"))
2786 ad
->a
.visibility
= STV_DEFAULT
;
2787 else if (!strcmp (tokc
.str
.data
, "hidden"))
2788 ad
->a
.visibility
= STV_HIDDEN
;
2789 else if (!strcmp (tokc
.str
.data
, "internal"))
2790 ad
->a
.visibility
= STV_INTERNAL
;
2791 else if (!strcmp (tokc
.str
.data
, "protected"))
2792 ad
->a
.visibility
= STV_PROTECTED
;
2794 expect("visibility(\"default|hidden|internal|protected\")");
2803 if (n
<= 0 || (n
& (n
- 1)) != 0)
2804 tcc_error("alignment must be a positive power of two");
2821 /* currently, no need to handle it because tcc does not
2822 track unused objects */
2826 /* currently, no need to handle it because tcc does not
2827 track unused objects */
2832 ad
->a
.func_call
= FUNC_CDECL
;
2837 ad
->a
.func_call
= FUNC_STDCALL
;
2839 #ifdef TCC_TARGET_I386
2849 ad
->a
.func_call
= FUNC_FASTCALL1
+ n
- 1;
2855 ad
->a
.func_call
= FUNC_FASTCALLW
;
2862 ad
->a
.mode
= VT_LLONG
+ 1;
2865 ad
->a
.mode
= VT_SHORT
+ 1;
2868 ad
->a
.mode
= VT_INT
+ 1;
2871 tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok
, NULL
));
2878 ad
->a
.func_export
= 1;
2881 ad
->a
.func_import
= 1;
2884 if (tcc_state
->warn_unsupported
)
2885 tcc_warning("'%s' attribute ignored", get_tok_str(t
, NULL
));
2886 /* skip parameters */
2888 int parenthesis
= 0;
2892 else if (tok
== ')')
2895 } while (parenthesis
&& tok
!= -1);
2908 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
2909 static void struct_decl(CType
*type
, int u
)
2911 int a
, v
, size
, align
, maxalign
, c
, offset
, flexible
;
2912 int bit_size
, bit_pos
, bsize
, bt
, lbit_pos
, prevbt
;
2913 Sym
*s
, *ss
, *ass
, **ps
;
2917 a
= tok
; /* save decl type */
2922 /* struct already defined ? return it */
2924 expect("struct/union/enum name");
2928 tcc_error("invalid type");
2936 /* we put an undefined size for struct/union */
2937 s
= sym_push(v
| SYM_STRUCT
, &type1
, 0, -1);
2938 s
->r
= 0; /* default alignment is zero as gcc */
2939 /* put struct/union/enum name in type */
2947 tcc_error("struct/union/enum already defined");
2948 /* cannot be empty */
2950 /* non empty enums are not allowed */
2951 if (a
== TOK_ENUM
) {
2955 expect("identifier");
2957 if (ss
&& !local_stack
)
2958 tcc_error("redefinition of enumerator '%s'",
2959 get_tok_str(v
, NULL
));
2965 /* enum symbols have static storage */
2966 ss
= sym_push(v
, &int_type
, VT_CONST
, c
);
2967 ss
->type
.t
|= VT_STATIC
;
2972 /* NOTE: we accept a trailing comma */
2976 s
->c
= type_size(&int_type
, &align
);
2985 while (tok
!= '}') {
2986 parse_btype(&btype
, &ad
);
2989 tcc_error("flexible array member '%s' not at the end of struct",
2990 get_tok_str(v
, NULL
));
2995 type_decl(&type1
, &ad
, &v
, TYPE_DIRECT
| TYPE_ABSTRACT
);
2997 if ((type1
.t
& VT_BTYPE
) != VT_STRUCT
)
2998 expect("identifier");
3000 int v
= btype
.ref
->v
;
3001 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
3002 if (tcc_state
->ms_extensions
== 0)
3003 expect("identifier");
3007 if (type_size(&type1
, &align
) < 0) {
3008 if ((a
== TOK_STRUCT
) && (type1
.t
& VT_ARRAY
) && c
)
3011 tcc_error("field '%s' has incomplete type",
3012 get_tok_str(v
, NULL
));
3014 if ((type1
.t
& VT_BTYPE
) == VT_FUNC
||
3015 (type1
.t
& (VT_TYPEDEF
| VT_STATIC
| VT_EXTERN
| VT_INLINE
)))
3016 tcc_error("invalid type for '%s'",
3017 get_tok_str(v
, NULL
));
3021 bit_size
= expr_const();
3022 /* XXX: handle v = 0 case for messages */
3024 tcc_error("negative width in bit-field '%s'",
3025 get_tok_str(v
, NULL
));
3026 if (v
&& bit_size
== 0)
3027 tcc_error("zero width for bit-field '%s'",
3028 get_tok_str(v
, NULL
));
3030 size
= type_size(&type1
, &align
);
3032 if (align
< ad
.a
.aligned
)
3033 align
= ad
.a
.aligned
;
3034 } else if (ad
.a
.packed
) {
3036 } else if (*tcc_state
->pack_stack_ptr
) {
3037 if (align
> *tcc_state
->pack_stack_ptr
)
3038 align
= *tcc_state
->pack_stack_ptr
;
3041 if (bit_size
>= 0) {
3042 bt
= type1
.t
& VT_BTYPE
;
3049 tcc_error("bitfields must have scalar type");
3051 if (bit_size
> bsize
) {
3052 tcc_error("width of '%s' exceeds its type",
3053 get_tok_str(v
, NULL
));
3054 } else if (bit_size
== bsize
) {
3055 /* no need for bit fields */
3057 } else if (bit_size
== 0) {
3058 /* XXX: what to do if only padding in a
3060 /* zero size: means to pad */
3063 /* we do not have enough room ?
3064 did the type change?
3066 if ((bit_pos
+ bit_size
) > bsize
||
3067 bt
!= prevbt
|| a
== TOK_UNION
)
3070 /* XXX: handle LSB first */
3071 type1
.t
|= VT_BITFIELD
|
3072 (bit_pos
<< VT_STRUCT_SHIFT
) |
3073 (bit_size
<< (VT_STRUCT_SHIFT
+ 6));
3074 bit_pos
+= bit_size
;
3080 if (v
!= 0 || (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
3081 /* add new memory data only if starting
3083 if (lbit_pos
== 0) {
3084 if (a
== TOK_STRUCT
) {
3085 c
= (c
+ align
- 1) & -align
;
3094 if (align
> maxalign
)
3098 printf("add field %s offset=%d",
3099 get_tok_str(v
, NULL
), offset
);
3100 if (type1
.t
& VT_BITFIELD
) {
3101 printf(" pos=%d size=%d",
3102 (type1
.t
>> VT_STRUCT_SHIFT
) & 0x3f,
3103 (type1
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f);
3108 if (v
== 0 && (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
3110 while ((ass
= ass
->next
) != NULL
) {
3111 ss
= sym_push(ass
->v
, &ass
->type
, 0, offset
+ ass
->c
);
3116 ss
= sym_push(v
| SYM_FIELD
, &type1
, 0, offset
);
3120 if (tok
== ';' || tok
== TOK_EOF
)
3127 /* store size and alignment */
3128 s
->c
= (c
+ maxalign
- 1) & -maxalign
;
3134 /* return 1 if basic type is a type size (short, long, long long) */
3135 ST_FUNC
int is_btype_size(int bt
)
3137 return bt
== VT_SHORT
|| bt
== VT_LONG
|| bt
== VT_LLONG
;
3140 /* Add type qualifiers to a type. If the type is an array then the qualifiers
3141 are added to the element type, copied because it could be a typedef. */
3142 static void parse_btype_qualify(CType
*type
, int qualifiers
)
3144 while (type
->t
& VT_ARRAY
) {
3145 type
->ref
= sym_push(SYM_FIELD
, &type
->ref
->type
, 0, type
->ref
->c
);
3146 type
= &type
->ref
->type
;
3148 type
->t
|= qualifiers
;
3151 /* return 0 if no type declaration. otherwise, return the basic type
3154 static int parse_btype(CType
*type
, AttributeDef
*ad
)
3156 int t
, u
, bt_size
, complete
, type_found
, typespec_found
;
3160 memset(ad
, 0, sizeof(AttributeDef
));
3168 /* currently, we really ignore extension */
3179 tcc_error("too many basic types");
3181 bt_size
= is_btype_size (u
& VT_BTYPE
);
3182 if (u
== VT_INT
|| (!bt_size
&& !(t
& VT_TYPEDEF
)))
3197 if ((t
& VT_BTYPE
) == VT_DOUBLE
) {
3198 #ifndef TCC_TARGET_PE
3199 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3201 } else if ((t
& VT_BTYPE
) == VT_LONG
) {
3202 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3208 #ifdef TCC_TARGET_ARM64
3210 /* GCC's __uint128_t appears in some Linux header files. Make it a
3211 synonym for long double to get the size and alignment right. */
3223 if ((t
& VT_BTYPE
) == VT_LONG
) {
3224 #ifdef TCC_TARGET_PE
3225 t
= (t
& ~VT_BTYPE
) | VT_DOUBLE
;
3227 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3235 struct_decl(&type1
, VT_ENUM
);
3238 type
->ref
= type1
.ref
;
3242 struct_decl(&type1
, VT_STRUCT
);
3245 /* type modifiers */
3250 parse_btype_qualify(type
, VT_CONSTANT
);
3258 parse_btype_qualify(type
, VT_VOLATILE
);
3265 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == (VT_DEFSIGN
|VT_UNSIGNED
))
3266 tcc_error("signed and unsigned modifier");
3279 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == VT_DEFSIGN
)
3280 tcc_error("signed and unsigned modifier");
3281 t
|= VT_DEFSIGN
| VT_UNSIGNED
;
3306 /* GNUC attribute */
3307 case TOK_ATTRIBUTE1
:
3308 case TOK_ATTRIBUTE2
:
3309 parse_attribute(ad
);
3312 t
= (t
& ~VT_BTYPE
) | u
;
3320 parse_expr_type(&type1
);
3321 /* remove all storage modifiers except typedef */
3322 type1
.t
&= ~(VT_STORAGE
&~VT_TYPEDEF
);
3328 if (!s
|| !(s
->type
.t
& VT_TYPEDEF
))
3331 type
->t
= ((s
->type
.t
& ~VT_TYPEDEF
) |
3332 (t
& ~(VT_CONSTANT
| VT_VOLATILE
)));
3333 type
->ref
= s
->type
.ref
;
3334 if (t
& (VT_CONSTANT
| VT_VOLATILE
))
3335 parse_btype_qualify(type
, t
& (VT_CONSTANT
| VT_VOLATILE
));
3339 /* get attributes from typedef */
3340 if (0 == ad
->a
.aligned
)
3341 ad
->a
.aligned
= s
->a
.aligned
;
3342 if (0 == ad
->a
.func_call
)
3343 ad
->a
.func_call
= s
->a
.func_call
;
3344 ad
->a
.packed
|= s
->a
.packed
;
3353 if (tcc_state
->char_is_unsigned
) {
3354 if ((t
& (VT_DEFSIGN
|VT_BTYPE
)) == VT_BYTE
)
3358 /* long is never used as type */
3359 if ((t
& VT_BTYPE
) == VT_LONG
)
3360 #if (!defined TCC_TARGET_X86_64 && !defined TCC_TARGET_ARM64) || \
3361 defined TCC_TARGET_PE
3362 t
= (t
& ~VT_BTYPE
) | VT_INT
;
3364 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3370 /* convert a function parameter type (array to pointer and function to
3371 function pointer) */
3372 static inline void convert_parameter_type(CType
*pt
)
3374 /* remove const and volatile qualifiers (XXX: const could be used
3375 to indicate a const function parameter */
3376 pt
->t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3377 /* array must be transformed to pointer according to ANSI C */
3379 if ((pt
->t
& VT_BTYPE
) == VT_FUNC
) {
3384 ST_FUNC
void parse_asm_str(CString
*astr
)
3387 /* read the string */
3389 expect("string constant");
3391 while (tok
== TOK_STR
) {
3392 /* XXX: add \0 handling too ? */
3393 cstr_cat(astr
, tokc
.str
.data
);
3396 cstr_ccat(astr
, '\0');
3399 /* Parse an asm label and return the token */
3400 static int asm_label_instr(void)
3406 parse_asm_str(&astr
);
3409 printf("asm_alias: \"%s\"\n", (char *)astr
.data
);
3411 v
= tok_alloc(astr
.data
, astr
.size
- 1)->tok
;
3416 static void post_type(CType
*type
, AttributeDef
*ad
)
3418 int n
, l
, t1
, arg_size
, align
;
3419 Sym
**plast
, *s
, *first
;
3424 /* function declaration */
3432 /* read param name and compute offset */
3433 if (l
!= FUNC_OLD
) {
3434 if (!parse_btype(&pt
, &ad1
)) {
3436 tcc_error("invalid type");
3443 if ((pt
.t
& VT_BTYPE
) == VT_VOID
&& tok
== ')')
3445 type_decl(&pt
, &ad1
, &n
, TYPE_DIRECT
| TYPE_ABSTRACT
);
3446 if ((pt
.t
& VT_BTYPE
) == VT_VOID
)
3447 tcc_error("parameter declared as void");
3448 arg_size
+= (type_size(&pt
, &align
) + PTR_SIZE
- 1) / PTR_SIZE
;
3453 expect("identifier");
3457 convert_parameter_type(&pt
);
3458 s
= sym_push(n
| SYM_FIELD
, &pt
, 0, 0);
3464 if (l
== FUNC_NEW
&& tok
== TOK_DOTS
) {
3471 /* if no parameters, then old type prototype */
3475 /* NOTE: const is ignored in returned type as it has a special
3476 meaning in gcc / C++ */
3477 type
->t
&= ~VT_CONSTANT
;
3478 /* some ancient pre-K&R C allows a function to return an array
3479 and the array brackets to be put after the arguments, such
3480 that "int c()[]" means something like "int[] c()" */
3483 skip(']'); /* only handle simple "[]" */
3486 /* we push a anonymous symbol which will contain the function prototype */
3487 ad
->a
.func_args
= arg_size
;
3488 s
= sym_push(SYM_FIELD
, type
, 0, l
);
3493 } else if (tok
== '[') {
3494 /* array definition */
3496 if (tok
== TOK_RESTRICT1
)
3501 if (!local_stack
|| nocode_wanted
)
3502 vpushi(expr_const());
3504 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3507 tcc_error("invalid array size");
3509 if (!is_integer_btype(vtop
->type
.t
& VT_BTYPE
))
3510 tcc_error("size of variable length array should be an integer");
3515 /* parse next post type */
3516 post_type(type
, ad
);
3517 if (type
->t
== VT_FUNC
)
3518 tcc_error("declaration of an array of functions");
3519 t1
|= type
->t
& VT_VLA
;
3522 loc
-= type_size(&int_type
, &align
);
3526 vla_runtime_type_size(type
, &align
);
3528 vset(&int_type
, VT_LOCAL
|VT_LVAL
, n
);
3535 /* we push an anonymous symbol which will contain the array
3537 s
= sym_push(SYM_FIELD
, type
, 0, n
);
3538 type
->t
= (t1
? VT_VLA
: VT_ARRAY
) | VT_PTR
;
3543 /* Parse a type declaration (except basic type), and return the type
3544 in 'type'. 'td' is a bitmask indicating which kind of type decl is
3545 expected. 'type' should contain the basic type. 'ad' is the
3546 attribute definition of the basic type. It can be modified by
3549 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
)
3552 CType type1
, *type2
;
3553 int qualifiers
, storage
;
3555 while (tok
== '*') {
3563 qualifiers
|= VT_CONSTANT
;
3568 qualifiers
|= VT_VOLATILE
;
3576 type
->t
|= qualifiers
;
3579 /* XXX: clarify attribute handling */
3580 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3581 parse_attribute(ad
);
3583 /* recursive type */
3584 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
3585 type1
.t
= 0; /* XXX: same as int */
3588 /* XXX: this is not correct to modify 'ad' at this point, but
3589 the syntax is not clear */
3590 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3591 parse_attribute(ad
);
3592 type_decl(&type1
, ad
, v
, td
);
3595 /* type identifier */
3596 if (tok
>= TOK_IDENT
&& (td
& TYPE_DIRECT
)) {
3600 if (!(td
& TYPE_ABSTRACT
))
3601 expect("identifier");
3605 storage
= type
->t
& VT_STORAGE
;
3606 type
->t
&= ~VT_STORAGE
;
3607 if (storage
& VT_STATIC
) {
3608 int saved_nocode_wanted
= nocode_wanted
;
3610 post_type(type
, ad
);
3611 nocode_wanted
= saved_nocode_wanted
;
3613 post_type(type
, ad
);
3615 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3616 parse_attribute(ad
);
3620 /* append type at the end of type1 */
3633 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
3634 ST_FUNC
int lvalue_type(int t
)
3639 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
3641 else if (bt
== VT_SHORT
)
3645 if (t
& VT_UNSIGNED
)
3646 r
|= VT_LVAL_UNSIGNED
;
3650 /* indirection with full error checking and bound check */
3651 ST_FUNC
void indir(void)
3653 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
) {
3654 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FUNC
)
3658 if ((vtop
->r
& VT_LVAL
) && !nocode_wanted
)
3660 vtop
->type
= *pointed_type(&vtop
->type
);
3661 /* Arrays and functions are never lvalues */
3662 if (!(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_VLA
)
3663 && (vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
3664 vtop
->r
|= lvalue_type(vtop
->type
.t
);
3665 /* if bound checking, the referenced pointer must be checked */
3666 #ifdef CONFIG_TCC_BCHECK
3667 if (tcc_state
->do_bounds_check
)
3668 vtop
->r
|= VT_MUSTBOUND
;
3673 /* pass a parameter to a function and do type checking and casting */
3674 static void gfunc_param_typed(Sym
*func
, Sym
*arg
)
3679 func_type
= func
->c
;
3680 if (func_type
== FUNC_OLD
||
3681 (func_type
== FUNC_ELLIPSIS
&& arg
== NULL
)) {
3682 /* default casting : only need to convert float to double */
3683 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
) {
3686 } else if (vtop
->type
.t
& VT_BITFIELD
) {
3687 type
.t
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
3690 } else if (arg
== NULL
) {
3691 tcc_error("too many arguments to function");
3694 type
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
3695 gen_assign_cast(&type
);
3699 /* parse an expression of the form '(type)' or '(expr)' and return its
3701 static void parse_expr_type(CType
*type
)
3707 if (parse_btype(type
, &ad
)) {
3708 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3715 static void parse_type(CType
*type
)
3720 if (!parse_btype(type
, &ad
)) {
3723 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3726 static void vpush_tokc(int t
)
3731 vsetc(&type
, VT_CONST
, &tokc
);
3734 ST_FUNC
void unary(void)
3736 int n
, t
, align
, size
, r
, sizeof_caller
;
3740 static int in_sizeof
= 0;
3742 sizeof_caller
= in_sizeof
;
3744 /* XXX: GCC 2.95.3 does not generate a table although it should be
3758 vpush_tokc(VT_INT
| VT_UNSIGNED
);
3762 vpush_tokc(VT_LLONG
);
3766 vpush_tokc(VT_LLONG
| VT_UNSIGNED
);
3770 vpush_tokc(VT_FLOAT
);
3774 vpush_tokc(VT_DOUBLE
);
3778 vpush_tokc(VT_LDOUBLE
);
3781 case TOK___FUNCTION__
:
3783 goto tok_identifier
;
3789 /* special function name identifier */
3790 len
= strlen(funcname
) + 1;
3791 /* generate char[len] type */
3796 vpush_ref(&type
, data_section
, data_section
->data_offset
, len
);
3797 ptr
= section_ptr_add(data_section
, len
);
3798 memcpy(ptr
, funcname
, len
);
3803 #ifdef TCC_TARGET_PE
3804 t
= VT_SHORT
| VT_UNSIGNED
;
3810 /* string parsing */
3813 if (tcc_state
->warn_write_strings
)
3818 memset(&ad
, 0, sizeof(AttributeDef
));
3819 decl_initializer_alloc(&type
, &ad
, VT_CONST
, 2, 0, 0);
3824 if (parse_btype(&type
, &ad
)) {
3825 type_decl(&type
, &ad
, &n
, TYPE_ABSTRACT
);
3827 /* check ISOC99 compound literal */
3829 /* data is allocated locally by default */
3834 /* all except arrays are lvalues */
3835 if (!(type
.t
& VT_ARRAY
))
3836 r
|= lvalue_type(type
.t
);
3837 memset(&ad
, 0, sizeof(AttributeDef
));
3838 decl_initializer_alloc(&type
, &ad
, r
, 1, 0, 0);
3840 if (sizeof_caller
) {
3847 } else if (tok
== '{') {
3849 tcc_error("expected constant");
3850 /* save all registers */
3852 /* statement expression : we do not accept break/continue
3853 inside as GCC does */
3854 block(NULL
, NULL
, NULL
, NULL
, 0, 1);
3869 /* functions names must be treated as function pointers,
3870 except for unary '&' and sizeof. Since we consider that
3871 functions are not lvalues, we only have to handle it
3872 there and in function calls. */
3873 /* arrays can also be used although they are not lvalues */
3874 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
&&
3875 !(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_LLOCAL
))
3877 mk_pointer(&vtop
->type
);
3883 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3885 boolean
.t
= VT_BOOL
;
3887 vtop
->c
.i
= !vtop
->c
.i
;
3888 } else if ((vtop
->r
& VT_VALMASK
) == VT_CMP
)
3892 vseti(VT_JMP
, gvtst(1, 0));
3904 if ((vtop
->type
.t
& VT_BTYPE
) == VT_PTR
)
3905 tcc_error("pointer not accepted for unary plus");
3906 /* In order to force cast, we add zero, except for floating point
3907 where we really need an noop (otherwise -0.0 will be transformed
3909 if (!is_float(vtop
->type
.t
)) {
3920 unary_type(&type
); // Perform a in_sizeof = 0;
3921 size
= type_size(&type
, &align
);
3922 if (t
== TOK_SIZEOF
) {
3923 if (!(type
.t
& VT_VLA
)) {
3925 tcc_error("sizeof applied to an incomplete type");
3928 vla_runtime_type_size(&type
, &align
);
3933 vtop
->type
.t
|= VT_UNSIGNED
;
3936 case TOK_builtin_types_compatible_p
:
3945 type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3946 type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3947 vpushi(is_compatible_types(&type1
, &type2
));
3950 case TOK_builtin_constant_p
:
3952 int saved_nocode_wanted
, res
;
3955 saved_nocode_wanted
= nocode_wanted
;
3958 res
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
3960 nocode_wanted
= saved_nocode_wanted
;
3965 case TOK_builtin_frame_address
:
3966 case TOK_builtin_return_address
:
3973 if (tok
!= TOK_CINT
) {
3974 tcc_error("%s only takes positive integers",
3975 tok1
== TOK_builtin_return_address
?
3976 "__builtin_return_address" :
3977 "__builtin_frame_address");
3979 level
= (uint32_t)tokc
.i
;
3984 vset(&type
, VT_LOCAL
, 0); /* local frame */
3986 mk_pointer(&vtop
->type
);
3987 indir(); /* -> parent frame */
3989 if (tok1
== TOK_builtin_return_address
) {
3990 // assume return address is just above frame pointer on stack
3993 mk_pointer(&vtop
->type
);
3998 #ifdef TCC_TARGET_X86_64
3999 #ifdef TCC_TARGET_PE
4000 case TOK_builtin_va_start
:
4008 if ((vtop
->r
& VT_VALMASK
) != VT_LOCAL
)
4009 tcc_error("__builtin_va_start expects a local variable");
4010 vtop
->r
&= ~(VT_LVAL
| VT_REF
);
4011 vtop
->type
= char_pointer_type
;
4016 case TOK_builtin_va_arg_types
:
4023 vpushi(classify_x86_64_va_arg(&type
));
4029 #ifdef TCC_TARGET_ARM64
4030 case TOK___va_start
: {
4032 tcc_error("statement in global scope");
4042 vtop
->type
.t
= VT_VOID
;
4045 case TOK___va_arg
: {
4048 tcc_error("statement in global scope");
4060 case TOK___arm64_clear_cache
: {
4069 vtop
->type
.t
= VT_VOID
;
4073 /* pre operations */
4084 t
= vtop
->type
.t
& VT_BTYPE
;
4086 /* In IEEE negate(x) isn't subtract(0,x), but rather
4091 else if (t
== VT_DOUBLE
)
4102 goto tok_identifier
;
4104 /* allow to take the address of a label */
4105 if (tok
< TOK_UIDENT
)
4106 expect("label identifier");
4107 s
= label_find(tok
);
4109 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
4111 if (s
->r
== LABEL_DECLARED
)
4112 s
->r
= LABEL_FORWARD
;
4115 s
->type
.t
= VT_VOID
;
4116 mk_pointer(&s
->type
);
4117 s
->type
.t
|= VT_STATIC
;
4119 vpushsym(&s
->type
, s
);
4123 // special qnan , snan and infinity values
4125 vpush64(VT_DOUBLE
, 0x7ff8000000000000ULL
);
4129 vpush64(VT_DOUBLE
, 0x7ff0000000000001ULL
);
4133 vpush64(VT_DOUBLE
, 0x7ff0000000000000ULL
);
4142 expect("identifier");
4145 const char *name
= get_tok_str(t
, NULL
);
4147 tcc_error("'%s' undeclared", name
);
4148 /* for simple function calls, we tolerate undeclared
4149 external reference to int() function */
4150 if (tcc_state
->warn_implicit_function_declaration
4151 #ifdef TCC_TARGET_PE
4152 /* people must be warned about using undeclared WINAPI functions
4153 (which usually start with uppercase letter) */
4154 || (name
[0] >= 'A' && name
[0] <= 'Z')
4157 tcc_warning("implicit declaration of function '%s'", name
);
4158 s
= external_global_sym(t
, &func_old_type
, 0);
4160 if ((s
->type
.t
& (VT_STATIC
| VT_INLINE
| VT_BTYPE
)) ==
4161 (VT_STATIC
| VT_INLINE
| VT_FUNC
)) {
4162 /* if referencing an inline function, then we generate a
4163 symbol to it if not already done. It will have the
4164 effect to generate code for it at the end of the
4165 compilation unit. Inline function as always
4166 generated in the text section. */
4168 put_extern_sym(s
, text_section
, 0, 0);
4169 r
= VT_SYM
| VT_CONST
;
4173 vset(&s
->type
, r
, s
->c
);
4174 /* if forward reference, we must point to s */
4175 if (vtop
->r
& VT_SYM
) {
4182 /* post operations */
4184 if (tok
== TOK_INC
|| tok
== TOK_DEC
) {
4187 } else if (tok
== '.' || tok
== TOK_ARROW
|| tok
== TOK_CDOUBLE
) {
4190 if (tok
== TOK_ARROW
)
4192 qualifiers
= vtop
->type
.t
& (VT_CONSTANT
| VT_VOLATILE
);
4195 /* expect pointer on structure */
4196 if ((vtop
->type
.t
& VT_BTYPE
) != VT_STRUCT
)
4197 expect("struct or union");
4198 if (tok
== TOK_CDOUBLE
)
4199 expect("field name");
4201 if (tok
== TOK_CINT
|| tok
== TOK_CUINT
)
4202 expect("field name");
4206 while ((s
= s
->next
) != NULL
) {
4211 tcc_error("field not found: %s", get_tok_str(tok
& ~SYM_FIELD
, &tokc
));
4212 /* add field offset to pointer */
4213 vtop
->type
= char_pointer_type
; /* change type to 'char *' */
4216 /* change type to field type, and set to lvalue */
4217 vtop
->type
= s
->type
;
4218 vtop
->type
.t
|= qualifiers
;
4219 /* an array is never an lvalue */
4220 if (!(vtop
->type
.t
& VT_ARRAY
)) {
4221 vtop
->r
|= lvalue_type(vtop
->type
.t
);
4222 #ifdef CONFIG_TCC_BCHECK
4223 /* if bound checking, the referenced pointer must be checked */
4224 if (tcc_state
->do_bounds_check
)
4225 vtop
->r
|= VT_MUSTBOUND
;
4229 } else if (tok
== '[') {
4235 } else if (tok
== '(') {
4238 int nb_args
, ret_nregs
, ret_align
, regsize
, variadic
;
4241 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
4242 /* pointer test (no array accepted) */
4243 if ((vtop
->type
.t
& (VT_BTYPE
| VT_ARRAY
)) == VT_PTR
) {
4244 vtop
->type
= *pointed_type(&vtop
->type
);
4245 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
)
4249 expect("function pointer");
4252 vtop
->r
&= ~VT_LVAL
; /* no lvalue */
4254 /* get return type */
4257 sa
= s
->next
; /* first parameter */
4260 /* compute first implicit argument if a structure is returned */
4261 if ((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
4262 variadic
= (s
->c
== FUNC_ELLIPSIS
);
4263 ret_nregs
= gfunc_sret(&s
->type
, variadic
, &ret
.type
,
4264 &ret_align
, ®size
);
4266 /* get some space for the returned structure */
4267 size
= type_size(&s
->type
, &align
);
4268 #ifdef TCC_TARGET_ARM64
4269 /* On arm64, a small struct is return in registers.
4270 It is much easier to write it to memory if we know
4271 that we are allowed to write some extra bytes, so
4272 round the allocated space up to a power of 2: */
4274 while (size
& (size
- 1))
4275 size
= (size
| (size
- 1)) + 1;
4277 loc
= (loc
- size
) & -align
;
4279 ret
.r
= VT_LOCAL
| VT_LVAL
;
4280 /* pass it as 'int' to avoid structure arg passing
4282 vseti(VT_LOCAL
, loc
);
4292 /* return in register */
4293 if (is_float(ret
.type
.t
)) {
4294 ret
.r
= reg_fret(ret
.type
.t
);
4295 #ifdef TCC_TARGET_X86_64
4296 if ((ret
.type
.t
& VT_BTYPE
) == VT_QFLOAT
)
4300 #ifndef TCC_TARGET_ARM64
4301 #ifdef TCC_TARGET_X86_64
4302 if ((ret
.type
.t
& VT_BTYPE
) == VT_QLONG
)
4304 if ((ret
.type
.t
& VT_BTYPE
) == VT_LLONG
)
4315 gfunc_param_typed(s
, sa
);
4325 tcc_error("too few arguments to function");
4327 if (!nocode_wanted
) {
4328 gfunc_call(nb_args
);
4330 vtop
-= (nb_args
+ 1);
4334 for (r
= ret
.r
+ ret_nregs
+ !ret_nregs
; r
-- > ret
.r
;) {
4335 vsetc(&ret
.type
, r
, &ret
.c
);
4336 vtop
->r2
= ret
.r2
; /* Loop only happens when r2 is VT_CONST */
4339 /* handle packed struct return */
4340 if (((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) && ret_nregs
) {
4343 size
= type_size(&s
->type
, &align
);
4344 /* We're writing whole regs often, make sure there's enough
4345 space. Assume register size is power of 2. */
4346 if (regsize
> align
)
4348 loc
= (loc
- size
) & -align
;
4352 vset(&ret
.type
, VT_LOCAL
| VT_LVAL
, addr
+ offset
);
4356 if (--ret_nregs
== 0)
4360 vset(&s
->type
, VT_LOCAL
| VT_LVAL
, addr
);
4368 ST_FUNC
void expr_prod(void)
4373 while (tok
== '*' || tok
== '/' || tok
== '%') {
4381 ST_FUNC
void expr_sum(void)
4386 while (tok
== '+' || tok
== '-') {
4394 static void expr_shift(void)
4399 while (tok
== TOK_SHL
|| tok
== TOK_SAR
) {
4407 static void expr_cmp(void)
4412 while ((tok
>= TOK_ULE
&& tok
<= TOK_GT
) ||
4413 tok
== TOK_ULT
|| tok
== TOK_UGE
) {
4421 static void expr_cmpeq(void)
4426 while (tok
== TOK_EQ
|| tok
== TOK_NE
) {
4434 static void expr_and(void)
4437 while (tok
== '&') {
4444 static void expr_xor(void)
4447 while (tok
== '^') {
4454 static void expr_or(void)
4457 while (tok
== '|') {
4464 static void expr_land(void)
4467 if (tok
== TOK_LAND
) {
4468 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
4479 int saved_nocode_wanted
= nocode_wanted
;
4483 nocode_wanted
= saved_nocode_wanted
;
4491 if (tok
!= TOK_LAND
) {
4502 static void expr_lor(void)
4505 if (tok
== TOK_LOR
) {
4506 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
4513 int saved_nocode_wanted
= nocode_wanted
;
4517 nocode_wanted
= saved_nocode_wanted
;
4529 if (tok
!= TOK_LOR
) {
4540 static void expr_cond(void)
4542 int tt
, u
, r1
, r2
, rc
, t1
, t2
, bt1
, bt2
, islv
;
4544 CType type
, type1
, type2
;
4549 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
4550 int saved_nocode_wanted
= nocode_wanted
;
4553 boolean
.t
= VT_BOOL
;
4559 if (tok
!= ':' || !gnu_ext
) {
4567 nocode_wanted
= saved_nocode_wanted
;
4570 if (tok
!= ':' || !gnu_ext
) {
4574 nocode_wanted
= saved_nocode_wanted
;
4581 if (vtop
!= vstack
) {
4582 /* needed to avoid having different registers saved in
4584 if (is_float(vtop
->type
.t
)) {
4586 #ifdef TCC_TARGET_X86_64
4587 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4597 if (tok
== ':' && gnu_ext
) {
4605 sv
= *vtop
; /* save value to handle it later */
4606 vtop
--; /* no vpop so that FP stack is not flushed */
4614 bt1
= t1
& VT_BTYPE
;
4616 bt2
= t2
& VT_BTYPE
;
4617 /* cast operands to correct type according to ISOC rules */
4618 if (is_float(bt1
) || is_float(bt2
)) {
4619 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
4620 type
.t
= VT_LDOUBLE
;
4621 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
4626 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
4627 /* cast to biggest op */
4629 /* convert to unsigned if it does not fit in a long long */
4630 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
4631 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
4632 type
.t
|= VT_UNSIGNED
;
4633 } else if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
4634 /* If one is a null ptr constant the result type
4636 if (is_null_pointer (vtop
))
4638 else if (is_null_pointer (&sv
))
4640 /* XXX: test pointer compatibility, C99 has more elaborate
4644 } else if (bt1
== VT_FUNC
|| bt2
== VT_FUNC
) {
4645 /* XXX: test function pointer compatibility */
4646 type
= bt1
== VT_FUNC
? type1
: type2
;
4647 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
4648 /* XXX: test structure compatibility */
4649 type
= bt1
== VT_STRUCT
? type1
: type2
;
4650 } else if (bt1
== VT_VOID
|| bt2
== VT_VOID
) {
4651 /* NOTE: as an extension, we accept void on only one side */
4654 /* integer operations */
4656 /* convert to unsigned if it does not fit in an integer */
4657 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
4658 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
4659 type
.t
|= VT_UNSIGNED
;
4661 /* keep structs lvalue by transforming `(expr ? a : b)` to `*(expr ? &a : &b)` so
4662 that `(expr ? a : b).mem` does not error with "lvalue expected" */
4663 islv
= (vtop
->r
& VT_LVAL
) && (sv
.r
& VT_LVAL
) && VT_STRUCT
== (type
.t
& VT_BTYPE
);
4665 /* now we convert second operand */
4668 mk_pointer(&vtop
->type
);
4671 else if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4674 if (is_float(type
.t
)) {
4676 #ifdef TCC_TARGET_X86_64
4677 if ((type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4681 } else if ((type
.t
& VT_BTYPE
) == VT_LLONG
) {
4682 /* for long longs, we use fixed registers to avoid having
4683 to handle a complicated move */
4688 /* this is horrible, but we must also convert first
4692 /* put again first value and cast it */
4696 mk_pointer(&vtop
->type
);
4699 else if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4702 move_reg(r2
, r1
, type
.t
);
4711 static void expr_eq(void)
4717 (tok
>= TOK_A_MOD
&& tok
<= TOK_A_DIV
) ||
4718 tok
== TOK_A_XOR
|| tok
== TOK_A_OR
||
4719 tok
== TOK_A_SHL
|| tok
== TOK_A_SAR
) {
4734 ST_FUNC
void gexpr(void)
4745 /* parse an expression and return its type without any side effect. */
4746 static void expr_type(CType
*type
)
4748 int saved_nocode_wanted
;
4750 saved_nocode_wanted
= nocode_wanted
;
4755 nocode_wanted
= saved_nocode_wanted
;
4758 /* parse a unary expression and return its type without any side
4760 static void unary_type(CType
*type
)
4772 /* parse a constant expression and return value in vtop. */
4773 static void expr_const1(void)
4782 /* parse an integer constant and return its value. */
4783 ST_FUNC
int expr_const(void)
4787 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
4788 expect("constant expression");
4794 /* return the label token if current token is a label, otherwise
4796 static int is_label(void)
4800 /* fast test first */
4801 if (tok
< TOK_UIDENT
)
4803 /* no need to save tokc because tok is an identifier */
4810 unget_tok(last_tok
);
4815 static void label_or_decl(int l
)
4819 /* fast test first */
4820 if (tok
>= TOK_UIDENT
)
4822 /* no need to save tokc because tok is an identifier */
4826 unget_tok(last_tok
);
4829 unget_tok(last_tok
);
4834 static void block(int *bsym
, int *csym
, int *case_sym
, int *def_sym
,
4835 int case_reg
, int is_expr
)
4838 Sym
*s
, *frame_bottom
;
4840 /* generate line number info */
4841 if (tcc_state
->do_debug
&&
4842 (last_line_num
!= file
->line_num
|| last_ind
!= ind
)) {
4843 put_stabn(N_SLINE
, 0, file
->line_num
, ind
- func_ind
);
4845 last_line_num
= file
->line_num
;
4849 /* default return value is (void) */
4851 vtop
->type
.t
= VT_VOID
;
4854 if (tok
== TOK_IF
) {
4861 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4863 if (c
== TOK_ELSE
) {
4867 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4868 gsym(d
); /* patch else jmp */
4871 } else if (tok
== TOK_WHILE
) {
4880 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4884 } else if (tok
== '{') {
4886 int block_vla_sp_loc
= vla_sp_loc
, saved_vlas_in_scope
= vlas_in_scope
;
4889 /* record local declaration stack position */
4891 frame_bottom
= sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
4892 frame_bottom
->next
= scope_stack_bottom
;
4893 scope_stack_bottom
= frame_bottom
;
4894 llabel
= local_label_stack
;
4896 /* handle local labels declarations */
4897 if (tok
== TOK_LABEL
) {
4900 if (tok
< TOK_UIDENT
)
4901 expect("label identifier");
4902 label_push(&local_label_stack
, tok
, LABEL_DECLARED
);
4912 while (tok
!= '}') {
4913 label_or_decl(VT_LOCAL
);
4917 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
4920 /* pop locally defined labels */
4921 label_pop(&local_label_stack
, llabel
);
4923 /* XXX: this solution makes only valgrind happy...
4924 triggered by gcc.c-torture/execute/20000917-1.c */
4926 switch(vtop
->type
.t
& VT_BTYPE
) {
4928 /* this breaks a compilation of the linux kernel v2.4.26 */
4929 /* pmd_t *new = ({ __asm__ __volatile__("ud2\n") ; ((pmd_t *)1); }); */
4930 /* Look a commit a80acab: Display error on statement expressions with complex return type */
4931 /* A pointer is not a complex return type */
4935 for(p
=vtop
->type
.ref
;p
;p
=p
->prev
)
4937 tcc_error("unsupported expression type");
4940 /* pop locally defined symbols */
4941 scope_stack_bottom
= scope_stack_bottom
->next
;
4942 sym_pop(&local_stack
, s
);
4944 /* Pop VLA frames and restore stack pointer if required */
4945 if (vlas_in_scope
> saved_vlas_in_scope
) {
4946 vla_sp_loc
= saved_vlas_in_scope
? block_vla_sp_loc
: vla_sp_root_loc
;
4949 vlas_in_scope
= saved_vlas_in_scope
;
4952 } else if (tok
== TOK_RETURN
) {
4956 gen_assign_cast(&func_vt
);
4957 #ifdef TCC_TARGET_ARM64
4958 // Perhaps it would be better to use this for all backends:
4961 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
4962 CType type
, ret_type
;
4963 int ret_align
, ret_nregs
, regsize
;
4964 ret_nregs
= gfunc_sret(&func_vt
, func_var
, &ret_type
,
4965 &ret_align
, ®size
);
4966 if (0 == ret_nregs
) {
4967 /* if returning structure, must copy it to implicit
4968 first pointer arg location */
4971 vset(&type
, VT_LOCAL
| VT_LVAL
, func_vc
);
4974 /* copy structure value to pointer */
4977 /* returning structure packed into registers */
4978 int r
, size
, addr
, align
;
4979 size
= type_size(&func_vt
,&align
);
4980 if ((vtop
->r
!= (VT_LOCAL
| VT_LVAL
) ||
4981 (vtop
->c
.i
& (ret_align
-1)))
4982 && (align
& (ret_align
-1))) {
4983 loc
= (loc
- size
) & -ret_align
;
4986 vset(&type
, VT_LOCAL
| VT_LVAL
, addr
);
4990 vset(&ret_type
, VT_LOCAL
| VT_LVAL
, addr
);
4992 vtop
->type
= ret_type
;
4993 if (is_float(ret_type
.t
))
4994 r
= rc_fret(ret_type
.t
);
5000 if (--ret_nregs
== 0)
5002 /* We assume that when a structure is returned in multiple
5003 registers, their classes are consecutive values of the
5006 vtop
->c
.i
+= regsize
;
5007 vtop
->r
= VT_LOCAL
| VT_LVAL
;
5010 } else if (is_float(func_vt
.t
)) {
5011 gv(rc_fret(func_vt
.t
));
5016 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
5019 rsym
= gjmp(rsym
); /* jmp */
5020 } else if (tok
== TOK_BREAK
) {
5023 tcc_error("cannot break");
5024 *bsym
= gjmp(*bsym
);
5027 } else if (tok
== TOK_CONTINUE
) {
5030 tcc_error("cannot continue");
5031 vla_sp_restore_root();
5032 *csym
= gjmp(*csym
);
5035 } else if (tok
== TOK_FOR
) {
5040 frame_bottom
= sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
5041 frame_bottom
->next
= scope_stack_bottom
;
5042 scope_stack_bottom
= frame_bottom
;
5044 /* c99 for-loop init decl? */
5045 if (!decl0(VT_LOCAL
, 1)) {
5046 /* no, regular for-loop init expr */
5072 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
5076 scope_stack_bottom
= scope_stack_bottom
->next
;
5077 sym_pop(&local_stack
, s
);
5079 if (tok
== TOK_DO
) {
5085 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
5096 if (tok
== TOK_SWITCH
) {
5100 /* XXX: other types than integer */
5101 case_reg
= gv(RC_INT
);
5105 b
= gjmp(0); /* jump to first case */
5107 block(&a
, csym
, &b
, &c
, case_reg
, 0);
5108 /* if no default, jmp after switch */
5116 if (tok
== TOK_CASE
) {
5123 if (gnu_ext
&& tok
== TOK_DOTS
) {
5127 tcc_warning("empty case range");
5129 /* since a case is like a label, we must skip it with a jmp */
5137 *case_sym
= gtst(1, 0);
5140 *case_sym
= gtst(1, 0);
5144 *case_sym
= gtst(1, *case_sym
);
5146 case_reg
= gv(RC_INT
);
5151 goto block_after_label
;
5153 if (tok
== TOK_DEFAULT
) {
5159 tcc_error("too many 'default'");
5162 goto block_after_label
;
5164 if (tok
== TOK_GOTO
) {
5166 if (tok
== '*' && gnu_ext
) {
5170 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
)
5173 } else if (tok
>= TOK_UIDENT
) {
5174 s
= label_find(tok
);
5175 /* put forward definition if needed */
5177 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
5179 if (s
->r
== LABEL_DECLARED
)
5180 s
->r
= LABEL_FORWARD
;
5182 vla_sp_restore_root();
5183 if (s
->r
& LABEL_FORWARD
)
5184 s
->jnext
= gjmp(s
->jnext
);
5186 gjmp_addr(s
->jnext
);
5189 expect("label identifier");
5192 } else if (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
) {
5200 if (s
->r
== LABEL_DEFINED
)
5201 tcc_error("duplicate label '%s'", get_tok_str(s
->v
, NULL
));
5203 s
->r
= LABEL_DEFINED
;
5205 s
= label_push(&global_label_stack
, b
, LABEL_DEFINED
);
5209 /* we accept this, but it is a mistake */
5212 tcc_warning("deprecated use of label at end of compound statement");
5216 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
5219 /* expression case */
5234 /* t is the array or struct type. c is the array or struct
5235 address. cur_index/cur_field is the pointer to the current
5236 value. 'size_only' is true if only size info is needed (only used
5238 static void decl_designator(CType
*type
, Section
*sec
, unsigned long c
,
5239 int *cur_index
, Sym
**cur_field
,
5243 int notfirst
, index
, index_last
, align
, l
, nb_elems
, elem_size
;
5249 if (gnu_ext
&& (l
= is_label()) != 0)
5251 while (tok
== '[' || tok
== '.') {
5253 if (!(type
->t
& VT_ARRAY
))
5254 expect("array type");
5257 index
= expr_const();
5258 if (index
< 0 || (s
->c
>= 0 && index
>= s
->c
))
5259 expect("invalid index");
5260 if (tok
== TOK_DOTS
&& gnu_ext
) {
5262 index_last
= expr_const();
5263 if (index_last
< 0 ||
5264 (s
->c
>= 0 && index_last
>= s
->c
) ||
5266 expect("invalid index");
5272 *cur_index
= index_last
;
5273 type
= pointed_type(type
);
5274 elem_size
= type_size(type
, &align
);
5275 c
+= index
* elem_size
;
5276 /* NOTE: we only support ranges for last designator */
5277 nb_elems
= index_last
- index
+ 1;
5278 if (nb_elems
!= 1) {
5287 if ((type
->t
& VT_BTYPE
) != VT_STRUCT
)
5288 expect("struct/union type");
5301 /* XXX: fix this mess by using explicit storage field */
5303 type1
.t
|= (type
->t
& ~VT_TYPE
);
5317 if (type
->t
& VT_ARRAY
) {
5319 type
= pointed_type(type
);
5320 c
+= index
* type_size(type
, &align
);
5324 tcc_error("too many field init");
5325 /* XXX: fix this mess by using explicit storage field */
5327 type1
.t
|= (type
->t
& ~VT_TYPE
);
5332 decl_initializer(type
, sec
, c
, 0, size_only
);
5334 /* XXX: make it more general */
5335 if (!size_only
&& nb_elems
> 1) {
5336 unsigned long c_end
;
5341 tcc_error("range init not supported yet for dynamic storage");
5342 c_end
= c
+ nb_elems
* elem_size
;
5343 if (c_end
> sec
->data_allocated
)
5344 section_realloc(sec
, c_end
);
5345 src
= sec
->data
+ c
;
5347 for(i
= 1; i
< nb_elems
; i
++) {
5349 memcpy(dst
, src
, elem_size
);
5355 #define EXPR_CONST 1
5358 /* store a value or an expression directly in global data or in local array */
5359 static void init_putv(CType
*type
, Section
*sec
, unsigned long c
,
5360 int v
, int expr_type
)
5362 int saved_global_expr
, bt
, bit_pos
, bit_size
;
5364 unsigned long long bit_mask
;
5372 /* compound literals must be allocated globally in this case */
5373 saved_global_expr
= global_expr
;
5376 global_expr
= saved_global_expr
;
5377 /* NOTE: symbols are accepted */
5378 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) != VT_CONST
)
5379 tcc_error("initializer element is not constant");
5387 dtype
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
5390 /* XXX: not portable */
5391 /* XXX: generate error if incorrect relocation */
5392 gen_assign_cast(&dtype
);
5393 bt
= type
->t
& VT_BTYPE
;
5394 /* we'll write at most 16 bytes */
5395 if (c
+ 16 > sec
->data_allocated
) {
5396 section_realloc(sec
, c
+ 16);
5398 ptr
= sec
->data
+ c
;
5399 /* XXX: make code faster ? */
5400 if (!(type
->t
& VT_BITFIELD
)) {
5405 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5406 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
5407 bit_mask
= (1LL << bit_size
) - 1;
5409 if ((vtop
->r
& VT_SYM
) &&
5415 (bt
== VT_INT
&& bit_size
!= 32)))
5416 tcc_error("initializer element is not computable at load time");
5418 /* XXX: when cross-compiling we assume that each type has the
5419 same representation on host and target, which is likely to
5420 be wrong in the case of long double */
5422 vtop
->c
.i
= (vtop
->c
.i
!= 0);
5424 *(char *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5427 *(short *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5430 *(double *)ptr
= vtop
->c
.d
;
5433 *(long double *)ptr
= vtop
->c
.ld
;
5436 *(long long *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5439 addr_t val
= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5440 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
5441 if (vtop
->r
& VT_SYM
)
5442 greloca(sec
, vtop
->sym
, c
, R_DATA_PTR
, val
);
5444 *(addr_t
*)ptr
|= val
;
5446 if (vtop
->r
& VT_SYM
)
5447 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
5448 *(addr_t
*)ptr
|= val
;
5453 int val
= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5454 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
5455 if (vtop
->r
& VT_SYM
)
5456 greloca(sec
, vtop
->sym
, c
, R_DATA_PTR
, val
);
5460 if (vtop
->r
& VT_SYM
)
5461 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
5469 vset(&dtype
, VT_LOCAL
|VT_LVAL
, c
);
5476 /* put zeros for variable based init */
5477 static void init_putz(CType
*t
, Section
*sec
, unsigned long c
, int size
)
5480 /* nothing to do because globals are already set to zero */
5482 vpush_global_sym(&func_old_type
, TOK_memset
);
5484 #ifdef TCC_TARGET_ARM
5495 /* 't' contains the type and storage info. 'c' is the offset of the
5496 object in section 'sec'. If 'sec' is NULL, it means stack based
5497 allocation. 'first' is true if array '{' must be read (multi
5498 dimension implicit array init handling). 'size_only' is true if
5499 size only evaluation is wanted (only for arrays). */
5500 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
,
5501 int first
, int size_only
)
5503 int index
, array_length
, n
, no_oblock
, nb
, parlevel
, parlevel1
, i
;
5504 int size1
, align1
, expr_type
;
5508 if (type
->t
& VT_VLA
) {
5511 /* save current stack pointer */
5512 if (vlas_in_scope
== 0) {
5513 if (vla_sp_root_loc
== -1)
5514 vla_sp_root_loc
= (loc
-= PTR_SIZE
);
5515 gen_vla_sp_save(vla_sp_root_loc
);
5518 vla_runtime_type_size(type
, &a
);
5519 gen_vla_alloc(type
, a
);
5523 } else if (type
->t
& VT_ARRAY
) {
5527 t1
= pointed_type(type
);
5528 size1
= type_size(t1
, &align1
);
5531 if ((first
&& tok
!= TOK_LSTR
&& tok
!= TOK_STR
) ||
5534 tcc_error("character array initializer must be a literal,"
5535 " optionally enclosed in braces");
5540 /* only parse strings here if correct type (otherwise: handle
5541 them as ((w)char *) expressions */
5542 if ((tok
== TOK_LSTR
&&
5543 #ifdef TCC_TARGET_PE
5544 (t1
->t
& VT_BTYPE
) == VT_SHORT
&& (t1
->t
& VT_UNSIGNED
)
5546 (t1
->t
& VT_BTYPE
) == VT_INT
5548 ) || (tok
== TOK_STR
&& (t1
->t
& VT_BTYPE
) == VT_BYTE
)) {
5549 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5552 /* compute maximum number of chars wanted */
5554 cstr_len
= tokc
.str
.size
;
5556 cstr_len
= tokc
.str
.size
/ sizeof(nwchar_t
);
5559 if (n
>= 0 && nb
> (n
- array_length
))
5560 nb
= n
- array_length
;
5563 tcc_warning("initializer-string for array is too long");
5564 /* in order to go faster for common case (char
5565 string in global variable, we handle it
5567 if (sec
&& tok
== TOK_STR
&& size1
== 1) {
5568 memcpy(sec
->data
+ c
+ array_length
, tokc
.str
.data
, nb
);
5572 ch
= ((unsigned char *)tokc
.str
.data
)[i
];
5574 ch
= ((nwchar_t
*)tokc
.str
.data
)[i
];
5575 init_putv(t1
, sec
, c
+ (array_length
+ i
) * size1
,
5583 /* only add trailing zero if enough storage (no
5584 warning in this case since it is standard) */
5585 if (n
< 0 || array_length
< n
) {
5587 init_putv(t1
, sec
, c
+ (array_length
* size1
), 0, EXPR_VAL
);
5593 while (tok
!= '}') {
5594 decl_designator(type
, sec
, c
, &index
, NULL
, size_only
);
5595 if (n
>= 0 && index
>= n
)
5596 tcc_error("index too large");
5597 /* must put zero in holes (note that doing it that way
5598 ensures that it even works with designators) */
5599 if (!size_only
&& array_length
< index
) {
5600 init_putz(t1
, sec
, c
+ array_length
* size1
,
5601 (index
- array_length
) * size1
);
5604 if (index
> array_length
)
5605 array_length
= index
;
5606 /* special test for multi dimensional arrays (may not
5607 be strictly correct if designators are used at the
5609 if (index
>= n
&& no_oblock
)
5618 /* put zeros at the end */
5619 if (!size_only
&& n
>= 0 && array_length
< n
) {
5620 init_putz(t1
, sec
, c
+ array_length
* size1
,
5621 (n
- array_length
) * size1
);
5623 /* patch type size if needed */
5625 s
->c
= array_length
;
5626 } else if ((type
->t
& VT_BTYPE
) == VT_STRUCT
&&
5627 (sec
|| !first
|| tok
== '{')) {
5629 /* NOTE: the previous test is a specific case for automatic
5630 struct/union init */
5631 /* XXX: union needs only one init */
5638 if (tcc_state
->old_struct_init_code
) {
5639 /* an old version of struct initialization.
5640 It have a problems. But with a new version
5641 linux 2.4.26 can't load ramdisk.
5643 while (tok
== '(') {
5647 if (!parse_btype(&type1
, &ad1
))
5649 type_decl(&type1
, &ad1
, &n
, TYPE_ABSTRACT
);
5651 if (!is_assignable_types(type
, &type1
))
5652 tcc_error("invalid type for cast");
5659 if (!parse_btype(&type1
, &ad1
))
5661 type_decl(&type1
, &ad1
, &n
, TYPE_ABSTRACT
);
5663 if (!is_assignable_types(type
, &type1
))
5664 tcc_error("invalid type for cast");
5673 if (first
|| tok
== '{') {
5682 while (tok
!= '}') {
5683 decl_designator(type
, sec
, c
, NULL
, &f
, size_only
);
5685 if (!size_only
&& array_length
< index
) {
5686 init_putz(type
, sec
, c
+ array_length
,
5687 index
- array_length
);
5689 index
= index
+ type_size(&f
->type
, &align1
);
5690 if (index
> array_length
)
5691 array_length
= index
;
5693 /* gr: skip fields from same union - ugly. */
5696 int f_size
= type_size(&f
->type
, &align
);
5697 int f_type
= (f
->type
.t
& VT_BTYPE
);
5699 ///printf("index: %2d %08x -- %2d %08x\n", f->c, f->type.t, f->next->c, f->next->type.t);
5700 /* test for same offset */
5701 if (f
->next
->c
!= f
->c
)
5703 if ((f_type
== VT_STRUCT
) && (f_size
== 0)) {
5705 Lets assume a structure of size 0 can't be a member of the union.
5706 This allow to compile the following code from a linux kernel v2.4.26
5707 typedef struct { } rwlock_t;
5713 struct fs_struct init_fs = { { (1) }, (rwlock_t) {}, 0022, };
5714 tcc-0.9.23 can succesfully compile this version of the kernel.
5715 gcc don't have problems with this code too.
5719 /* if yes, test for bitfield shift */
5720 if ((f
->type
.t
& VT_BITFIELD
) && (f
->next
->type
.t
& VT_BITFIELD
)) {
5721 int bit_pos_1
= (f
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5722 int bit_pos_2
= (f
->next
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5723 //printf("bitfield %d %d\n", bit_pos_1, bit_pos_2);
5724 if (bit_pos_1
!= bit_pos_2
)
5731 if (no_oblock
&& f
== NULL
)
5737 /* put zeros at the end */
5738 if (!size_only
&& array_length
< n
) {
5739 init_putz(type
, sec
, c
+ array_length
,
5748 } else if (tok
== '{') {
5750 decl_initializer(type
, sec
, c
, first
, size_only
);
5752 } else if (size_only
) {
5753 /* just skip expression */
5754 parlevel
= parlevel1
= 0;
5755 while ((parlevel
> 0 || parlevel1
> 0 ||
5756 (tok
!= '}' && tok
!= ',')) && tok
!= -1) {
5759 else if (tok
== ')') {
5760 if (parlevel
== 0 && parlevel1
== 0)
5764 else if (tok
== '{')
5766 else if (tok
== '}') {
5767 if (parlevel
== 0 && parlevel1
== 0)
5774 /* currently, we always use constant expression for globals
5775 (may change for scripting case) */
5776 expr_type
= EXPR_CONST
;
5778 expr_type
= EXPR_ANY
;
5779 init_putv(type
, sec
, c
, 0, expr_type
);
5783 /* parse an initializer for type 't' if 'has_init' is non zero, and
5784 allocate space in local or global data space ('r' is either
5785 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
5786 variable 'v' of scope 'scope' is declared before initializers
5787 are parsed. If 'v' is zero, then a reference to the new object
5788 is put in the value stack. If 'has_init' is 2, a special parsing
5789 is done to handle string constants. */
5790 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
,
5791 int has_init
, int v
, int scope
)
5793 int size
, align
, addr
, data_offset
;
5795 ParseState saved_parse_state
= {0};
5796 TokenString init_str
;
5798 Sym
*flexible_array
;
5800 flexible_array
= NULL
;
5801 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
5802 Sym
*field
= type
->ref
->next
;
5805 field
= field
->next
;
5806 if (field
->type
.t
& VT_ARRAY
&& field
->type
.ref
->c
< 0)
5807 flexible_array
= field
;
5811 size
= type_size(type
, &align
);
5812 /* If unknown size, we must evaluate it before
5813 evaluating initializers because
5814 initializers can generate global data too
5815 (e.g. string pointers or ISOC99 compound
5816 literals). It also simplifies local
5817 initializers handling */
5818 tok_str_new(&init_str
);
5819 if (size
< 0 || (flexible_array
&& has_init
)) {
5821 tcc_error("unknown type size");
5822 /* get all init string */
5823 if (has_init
== 2) {
5824 /* only get strings */
5825 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5826 tok_str_add_tok(&init_str
);
5831 while (level
> 0 || (tok
!= ',' && tok
!= ';')) {
5833 tcc_error("unexpected end of file in initializer");
5834 tok_str_add_tok(&init_str
);
5837 else if (tok
== '}') {
5847 tok_str_add(&init_str
, -1);
5848 tok_str_add(&init_str
, 0);
5851 save_parse_state(&saved_parse_state
);
5853 begin_macro(&init_str
, 0);
5855 decl_initializer(type
, NULL
, 0, 1, 1);
5856 /* prepare second initializer parsing */
5857 macro_ptr
= init_str
.str
;
5860 /* if still unknown size, error */
5861 size
= type_size(type
, &align
);
5863 tcc_error("unknown type size");
5865 /* If there's a flex member and it was used in the initializer
5867 if (flexible_array
&&
5868 flexible_array
->type
.ref
->c
> 0)
5869 size
+= flexible_array
->type
.ref
->c
5870 * pointed_size(&flexible_array
->type
);
5871 /* take into account specified alignment if bigger */
5872 if (ad
->a
.aligned
) {
5873 if (ad
->a
.aligned
> align
)
5874 align
= ad
->a
.aligned
;
5875 } else if (ad
->a
.packed
) {
5878 if ((r
& VT_VALMASK
) == VT_LOCAL
) {
5880 #ifdef CONFIG_TCC_BCHECK
5881 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5885 loc
= (loc
- size
) & -align
;
5887 #ifdef CONFIG_TCC_BCHECK
5888 /* handles bounds */
5889 /* XXX: currently, since we do only one pass, we cannot track
5890 '&' operators, so we add only arrays */
5891 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5893 /* add padding between regions */
5895 /* then add local bound info */
5896 bounds_ptr
= section_ptr_add(lbounds_section
, 2 * sizeof(addr_t
));
5897 bounds_ptr
[0] = addr
;
5898 bounds_ptr
[1] = size
;
5902 /* local variable */
5903 sym_push(v
, type
, r
, addr
);
5905 /* push local reference */
5906 vset(type
, r
, addr
);
5912 if (v
&& scope
== VT_CONST
) {
5913 /* see if the symbol was already defined */
5916 if (!is_compatible_types(&sym
->type
, type
))
5917 tcc_error("incompatible types for redefinition of '%s'",
5918 get_tok_str(v
, NULL
));
5919 if (sym
->type
.t
& VT_EXTERN
) {
5920 /* if the variable is extern, it was not allocated */
5921 sym
->type
.t
&= ~VT_EXTERN
;
5922 /* set array size if it was omitted in extern
5924 if ((sym
->type
.t
& VT_ARRAY
) &&
5925 sym
->type
.ref
->c
< 0 &&
5927 sym
->type
.ref
->c
= type
->ref
->c
;
5929 /* we accept several definitions of the same
5930 global variable. this is tricky, because we
5931 must play with the SHN_COMMON type of the symbol */
5932 /* XXX: should check if the variable was already
5933 initialized. It is incorrect to initialized it
5935 /* no init data, we won't add more to the symbol */
5942 /* allocate symbol in corresponding section */
5947 else if (tcc_state
->nocommon
)
5951 data_offset
= sec
->data_offset
;
5952 data_offset
= (data_offset
+ align
- 1) & -align
;
5954 /* very important to increment global pointer at this time
5955 because initializers themselves can create new initializers */
5956 data_offset
+= size
;
5957 #ifdef CONFIG_TCC_BCHECK
5958 /* add padding if bound check */
5959 if (tcc_state
->do_bounds_check
)
5962 sec
->data_offset
= data_offset
;
5963 /* allocate section space to put the data */
5964 if (sec
->sh_type
!= SHT_NOBITS
&&
5965 data_offset
> sec
->data_allocated
)
5966 section_realloc(sec
, data_offset
);
5967 /* align section if needed */
5968 if (align
> sec
->sh_addralign
)
5969 sec
->sh_addralign
= align
;
5971 addr
= 0; /* avoid warning */
5975 if (scope
!= VT_CONST
|| !sym
) {
5976 sym
= sym_push(v
, type
, r
| VT_SYM
, 0);
5977 sym
->asm_label
= ad
->asm_label
;
5979 /* update symbol definition */
5981 put_extern_sym(sym
, sec
, addr
, size
);
5984 /* put a common area */
5985 put_extern_sym(sym
, NULL
, align
, size
);
5986 /* XXX: find a nicer way */
5987 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
5988 esym
->st_shndx
= SHN_COMMON
;
5991 /* push global reference */
5992 sym
= get_sym_ref(type
, sec
, addr
, size
);
5993 vpushsym(type
, sym
);
5995 /* patch symbol weakness */
5996 if (type
->t
& VT_WEAK
)
5998 apply_visibility(sym
, type
);
5999 #ifdef CONFIG_TCC_BCHECK
6000 /* handles bounds now because the symbol must be defined
6001 before for the relocation */
6002 if (tcc_state
->do_bounds_check
) {
6005 greloc(bounds_section
, sym
, bounds_section
->data_offset
, R_DATA_PTR
);
6006 /* then add global bound info */
6007 bounds_ptr
= section_ptr_add(bounds_section
, 2 * sizeof(addr_t
));
6008 bounds_ptr
[0] = 0; /* relocated */
6009 bounds_ptr
[1] = size
;
6013 if (has_init
|| (type
->t
& VT_VLA
)) {
6014 decl_initializer(type
, sec
, addr
, 1, 0);
6015 /* restore parse state if needed */
6018 restore_parse_state(&saved_parse_state
);
6020 /* patch flexible array member size back to -1, */
6021 /* for possible subsequent similar declarations */
6023 flexible_array
->type
.ref
->c
= -1;
6028 static void put_func_debug(Sym
*sym
)
6033 /* XXX: we put here a dummy type */
6034 snprintf(buf
, sizeof(buf
), "%s:%c1",
6035 funcname
, sym
->type
.t
& VT_STATIC
? 'f' : 'F');
6036 put_stabs_r(buf
, N_FUN
, 0, file
->line_num
, 0,
6037 cur_text_section
, sym
->c
);
6038 /* //gr gdb wants a line at the function */
6039 put_stabn(N_SLINE
, 0, file
->line_num
, 0);
6044 /* parse an old style function declaration list */
6045 /* XXX: check multiple parameter */
6046 static void func_decl_list(Sym
*func_sym
)
6053 /* parse each declaration */
6054 while (tok
!= '{' && tok
!= ';' && tok
!= ',' && tok
!= TOK_EOF
&&
6055 tok
!= TOK_ASM1
&& tok
!= TOK_ASM2
&& tok
!= TOK_ASM3
) {
6056 if (!parse_btype(&btype
, &ad
))
6057 expect("declaration list");
6058 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
6059 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
6061 /* we accept no variable after */
6065 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
6066 /* find parameter in function parameter list */
6069 if ((s
->v
& ~SYM_FIELD
) == v
)
6073 tcc_error("declaration for parameter '%s' but no such parameter",
6074 get_tok_str(v
, NULL
));
6076 /* check that no storage specifier except 'register' was given */
6077 if (type
.t
& VT_STORAGE
)
6078 tcc_error("storage class specified for '%s'", get_tok_str(v
, NULL
));
6079 convert_parameter_type(&type
);
6080 /* we can add the type (NOTE: it could be local to the function) */
6082 /* accept other parameters */
6093 /* parse a function defined by symbol 'sym' and generate its code in
6094 'cur_text_section' */
6095 static void gen_function(Sym
*sym
)
6097 int saved_nocode_wanted
= nocode_wanted
;
6100 ind
= cur_text_section
->data_offset
;
6101 /* NOTE: we patch the symbol size later */
6102 put_extern_sym(sym
, cur_text_section
, ind
, 0);
6103 funcname
= get_tok_str(sym
->v
, NULL
);
6105 /* Initialize VLA state */
6107 vla_sp_root_loc
= -1;
6108 /* put debug symbol */
6109 if (tcc_state
->do_debug
)
6110 put_func_debug(sym
);
6111 /* push a dummy symbol to enable local sym storage */
6112 sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
6113 gfunc_prolog(&sym
->type
);
6114 #ifdef CONFIG_TCC_BCHECK
6115 if (tcc_state
->do_bounds_check
&& !strcmp(funcname
, "main")) {
6118 for (i
= 0, sym
= local_stack
; i
< 2; i
++, sym
= sym
->prev
) {
6119 if (sym
->v
& SYM_FIELD
|| sym
->prev
->v
& SYM_FIELD
)
6121 vpush_global_sym(&func_old_type
, TOK___bound_main_arg
);
6122 vset(&sym
->type
, sym
->r
, sym
->c
);
6128 block(NULL
, NULL
, NULL
, NULL
, 0, 0);
6131 cur_text_section
->data_offset
= ind
;
6132 label_pop(&global_label_stack
, NULL
);
6133 /* reset local stack */
6134 scope_stack_bottom
= NULL
;
6135 sym_pop(&local_stack
, NULL
);
6136 /* end of function */
6137 /* patch symbol size */
6138 ((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
].st_size
=
6140 /* patch symbol weakness (this definition overrules any prototype) */
6141 if (sym
->type
.t
& VT_WEAK
)
6143 apply_visibility(sym
, &sym
->type
);
6144 if (tcc_state
->do_debug
) {
6145 put_stabn(N_FUN
, 0, 0, ind
- func_ind
);
6147 /* It's better to crash than to generate wrong code */
6148 cur_text_section
= NULL
;
6149 funcname
= ""; /* for safety */
6150 func_vt
.t
= VT_VOID
; /* for safety */
6151 func_var
= 0; /* for safety */
6152 ind
= 0; /* for safety */
6153 nocode_wanted
= saved_nocode_wanted
;
6157 ST_FUNC
void gen_inline_functions(void)
6160 int inline_generated
, i
, ln
;
6161 struct InlineFunc
*fn
;
6163 ln
= file
->line_num
;
6164 /* iterate while inline function are referenced */
6166 inline_generated
= 0;
6167 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
6168 fn
= tcc_state
->inline_fns
[i
];
6170 if (sym
&& sym
->c
) {
6171 /* the function was used: generate its code and
6172 convert it to a normal function */
6175 pstrcpy(file
->filename
, sizeof file
->filename
, fn
->filename
);
6176 sym
->r
= VT_SYM
| VT_CONST
;
6177 sym
->type
.t
&= ~VT_INLINE
;
6179 begin_macro(&fn
->func_str
, 0);
6181 cur_text_section
= text_section
;
6185 inline_generated
= 1;
6188 if (!inline_generated
)
6191 file
->line_num
= ln
;
6192 /* free tokens of unused inline functions */
6193 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
6194 fn
= tcc_state
->inline_fns
[i
];
6196 tok_str_free(fn
->func_str
.str
);
6198 dynarray_reset(&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
);
6201 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
6202 static int decl0(int l
, int is_for_loop_init
)
6210 if (!parse_btype(&btype
, &ad
)) {
6211 if (is_for_loop_init
)
6213 /* skip redundant ';' */
6214 /* XXX: find more elegant solution */
6219 if (l
== VT_CONST
&&
6220 (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
6221 /* global asm block */
6225 /* special test for old K&R protos without explicit int
6226 type. Only accepted when defining global data */
6227 if (l
== VT_LOCAL
|| tok
< TOK_DEFINE
)
6231 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
6232 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
6234 if ((btype
.t
& VT_BTYPE
) == VT_STRUCT
) {
6235 int v
= btype
.ref
->v
;
6236 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) >= SYM_FIRST_ANOM
)
6237 tcc_warning("unnamed struct/union that defines no instances");
6242 while (1) { /* iterate thru each declaration */
6244 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
6248 type_to_str(buf
, sizeof(buf
), t
, get_tok_str(v
, NULL
));
6249 printf("type = '%s'\n", buf
);
6252 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
6253 if ((type
.t
& VT_STATIC
) && (l
== VT_LOCAL
)) {
6254 tcc_error("function without file scope cannot be static");
6256 /* if old style function prototype, we accept a
6259 if (sym
->c
== FUNC_OLD
)
6260 func_decl_list(sym
);
6263 if (gnu_ext
&& (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
6264 ad
.asm_label
= asm_label_instr();
6265 /* parse one last attribute list, after asm label */
6266 parse_attribute(&ad
);
6273 #ifdef TCC_TARGET_PE
6274 if (ad
.a
.func_import
)
6275 type
.t
|= VT_IMPORT
;
6276 if (ad
.a
.func_export
)
6277 type
.t
|= VT_EXPORT
;
6279 type
.t
|= ad
.a
.visibility
<< VT_VIS_SHIFT
;
6283 tcc_error("cannot use local functions");
6284 if ((type
.t
& VT_BTYPE
) != VT_FUNC
)
6285 expect("function definition");
6287 /* reject abstract declarators in function definition */
6289 while ((sym
= sym
->next
) != NULL
)
6290 if (!(sym
->v
& ~SYM_FIELD
))
6291 expect("identifier");
6293 /* XXX: cannot do better now: convert extern line to static inline */
6294 if ((type
.t
& (VT_EXTERN
| VT_INLINE
)) == (VT_EXTERN
| VT_INLINE
))
6295 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
6300 if ((sym
->type
.t
& VT_BTYPE
) != VT_FUNC
)
6303 ref
= sym
->type
.ref
;
6304 if (0 == ref
->a
.func_proto
)
6305 tcc_error("redefinition of '%s'", get_tok_str(v
, NULL
));
6307 /* use func_call from prototype if not defined */
6308 if (ref
->a
.func_call
!= FUNC_CDECL
6309 && type
.ref
->a
.func_call
== FUNC_CDECL
)
6310 type
.ref
->a
.func_call
= ref
->a
.func_call
;
6312 /* use export from prototype */
6313 if (ref
->a
.func_export
)
6314 type
.ref
->a
.func_export
= 1;
6316 /* use static from prototype */
6317 if (sym
->type
.t
& VT_STATIC
)
6318 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
6320 /* If the definition has no visibility use the
6321 one from prototype. */
6322 if (! (type
.t
& VT_VIS_MASK
))
6323 type
.t
|= sym
->type
.t
& VT_VIS_MASK
;
6325 if (!is_compatible_types(&sym
->type
, &type
)) {
6327 tcc_error("incompatible types for redefinition of '%s'",
6328 get_tok_str(v
, NULL
));
6330 type
.ref
->a
.func_proto
= 0;
6331 /* if symbol is already defined, then put complete type */
6334 /* put function symbol */
6335 sym
= global_identifier_push(v
, type
.t
, 0);
6336 sym
->type
.ref
= type
.ref
;
6339 /* static inline functions are just recorded as a kind
6340 of macro. Their code will be emitted at the end of
6341 the compilation unit only if they are used */
6342 if ((type
.t
& (VT_INLINE
| VT_STATIC
)) ==
6343 (VT_INLINE
| VT_STATIC
)) {
6345 struct InlineFunc
*fn
;
6346 const char *filename
;
6348 filename
= file
? file
->filename
: "";
6349 fn
= tcc_malloc(sizeof *fn
+ strlen(filename
));
6350 strcpy(fn
->filename
, filename
);
6352 tok_str_new(&fn
->func_str
);
6358 tcc_error("unexpected end of file");
6359 tok_str_add_tok(&fn
->func_str
);
6364 } else if (t
== '}') {
6366 if (block_level
== 0)
6370 tok_str_add(&fn
->func_str
, -1);
6371 tok_str_add(&fn
->func_str
, 0);
6372 dynarray_add((void ***)&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
, fn
);
6375 /* compute text section */
6376 cur_text_section
= ad
.section
;
6377 if (!cur_text_section
)
6378 cur_text_section
= text_section
;
6379 sym
->r
= VT_SYM
| VT_CONST
;
6384 if (btype
.t
& VT_TYPEDEF
) {
6385 /* save typedefed type */
6386 /* XXX: test storage specifiers ? */
6387 sym
= sym_push(v
, &type
, 0, 0);
6389 sym
->type
.t
|= VT_TYPEDEF
;
6392 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
6393 /* external function definition */
6394 /* specific case for func_call attribute */
6395 ad
.a
.func_proto
= 1;
6397 } else if (!(type
.t
& VT_ARRAY
)) {
6398 /* not lvalue if array */
6399 r
|= lvalue_type(type
.t
);
6401 has_init
= (tok
== '=');
6402 if (has_init
&& (type
.t
& VT_VLA
))
6403 tcc_error("Variable length array cannot be initialized");
6404 if ((btype
.t
& VT_EXTERN
) || ((type
.t
& VT_BTYPE
) == VT_FUNC
) ||
6405 ((type
.t
& VT_ARRAY
) && (type
.t
& VT_STATIC
) &&
6406 !has_init
&& l
== VT_CONST
&& type
.ref
->c
< 0)) {
6407 /* external variable or function */
6408 /* NOTE: as GCC, uninitialized global static
6409 arrays of null size are considered as
6411 sym
= external_sym(v
, &type
, r
);
6412 sym
->asm_label
= ad
.asm_label
;
6414 if (ad
.alias_target
) {
6419 alias_target
= sym_find(ad
.alias_target
);
6420 if (!alias_target
|| !alias_target
->c
)
6421 tcc_error("unsupported forward __alias__ attribute");
6422 esym
= &((Elf32_Sym
*)symtab_section
->data
)[alias_target
->c
];
6423 tsec
.sh_num
= esym
->st_shndx
;
6424 put_extern_sym2(sym
, &tsec
, esym
->st_value
, esym
->st_size
, 0);
6427 type
.t
|= (btype
.t
& VT_STATIC
); /* Retain "static". */
6428 if (type
.t
& VT_STATIC
)
6434 decl_initializer_alloc(&type
, &ad
, r
, has_init
, v
, l
);
6438 if (is_for_loop_init
)
6451 ST_FUNC
void decl(int l
)