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 vla_sp_loc_tmp
; /* vla_sp_loc is set to this when the value won't be needed later */
59 ST_DATA
int vla_sp_root_loc
; /* vla_sp_loc for SP before any VLAs were pushed */
60 ST_DATA
int *vla_sp_loc
; /* Pointer to variable holding location to store stack pointer on the stack when modifying stack pointer */
61 ST_DATA
int vla_flags
; /* VLA_* flags */
63 ST_DATA SValue __vstack
[1+VSTACK_SIZE
], *vtop
;
65 ST_DATA
int const_wanted
; /* true if constant wanted */
66 ST_DATA
int nocode_wanted
; /* true if no code generation wanted for an expression */
67 ST_DATA
int global_expr
; /* true if compound literals must be allocated globally (used during initializers parsing */
68 ST_DATA CType func_vt
; /* current function return type (used by return instruction) */
69 ST_DATA
int func_var
; /* true if current function is variadic (used by return instruction) */
71 ST_DATA
int last_line_num
, last_ind
, func_ind
; /* debug last line number and pc */
72 ST_DATA
char *funcname
;
74 ST_DATA CType char_pointer_type
, func_old_type
, int_type
, size_type
;
76 /* ------------------------------------------------------------------------- */
77 static void gen_cast(CType
*type
);
78 static inline CType
*pointed_type(CType
*type
);
79 static int is_compatible_types(CType
*type1
, CType
*type2
);
80 static int parse_btype(CType
*type
, AttributeDef
*ad
);
81 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
);
82 static void parse_expr_type(CType
*type
);
83 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
, int first
, int size_only
);
84 static void block(int *bsym
, int *csym
, int *case_sym
, int *def_sym
, int case_reg
, int is_expr
);
85 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
, int has_init
, int v
, char *asm_label
, int scope
);
86 static int decl0(int l
, int is_for_loop_init
);
87 static void expr_eq(void);
88 static void unary_type(CType
*type
);
89 static void vla_runtime_type_size(CType
*type
, int *a
);
90 static void vla_sp_save(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 /* ------------------------------------------------------------------------- */
122 /* symbol allocator */
123 static Sym
*__sym_malloc(void)
125 Sym
*sym_pool
, *sym
, *last_sym
;
128 sym_pool
= tcc_malloc(SYM_POOL_NB
* sizeof(Sym
));
129 dynarray_add(&sym_pools
, &nb_sym_pools
, sym_pool
);
131 last_sym
= sym_free_first
;
133 for(i
= 0; i
< SYM_POOL_NB
; i
++) {
134 sym
->next
= last_sym
;
138 sym_free_first
= last_sym
;
142 static inline Sym
*sym_malloc(void)
145 sym
= sym_free_first
;
147 sym
= __sym_malloc();
148 sym_free_first
= sym
->next
;
152 ST_INLN
void sym_free(Sym
*sym
)
154 sym
->next
= sym_free_first
;
155 tcc_free(sym
->asm_label
);
156 sym_free_first
= sym
;
159 /* push, without hashing */
160 ST_FUNC Sym
*sym_push2(Sym
**ps
, int v
, int t
, long c
)
163 if (ps
== &local_stack
) {
164 for (s
= *ps
; s
&& s
!= scope_stack_bottom
; s
= s
->prev
)
165 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
&& s
->v
== v
)
166 tcc_error("incompatible types for redefinition of '%s'",
167 get_tok_str(v
, NULL
));
185 /* find a symbol and return its associated structure. 's' is the top
186 of the symbol stack */
187 ST_FUNC Sym
*sym_find2(Sym
*s
, int v
)
199 /* structure lookup */
200 ST_INLN Sym
*struct_find(int v
)
203 if ((unsigned)v
>= (unsigned)(tok_ident
- TOK_IDENT
))
205 return table_ident
[v
]->sym_struct
;
208 /* find an identifier */
209 ST_INLN Sym
*sym_find(int v
)
212 if ((unsigned)v
>= (unsigned)(tok_ident
- TOK_IDENT
))
214 return table_ident
[v
]->sym_identifier
;
217 /* push a given symbol on the symbol stack */
218 ST_FUNC Sym
*sym_push(int v
, CType
*type
, int r
, int c
)
227 s
= sym_push2(ps
, v
, type
->t
, c
);
228 s
->type
.ref
= type
->ref
;
230 /* don't record fields or anonymous symbols */
232 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
233 /* record symbol in token array */
234 ts
= table_ident
[(v
& ~SYM_STRUCT
) - TOK_IDENT
];
236 ps
= &ts
->sym_struct
;
238 ps
= &ts
->sym_identifier
;
245 /* push a global identifier */
246 ST_FUNC Sym
*global_identifier_push(int v
, int t
, int c
)
249 s
= sym_push2(&global_stack
, v
, t
, c
);
250 /* don't record anonymous symbol */
251 if (v
< SYM_FIRST_ANOM
) {
252 ps
= &table_ident
[v
- TOK_IDENT
]->sym_identifier
;
253 /* modify the top most local identifier, so that
254 sym_identifier will point to 's' when popped */
256 ps
= &(*ps
)->prev_tok
;
263 /* pop symbols until top reaches 'b' */
264 ST_FUNC
void sym_pop(Sym
**ptop
, Sym
*b
)
274 /* remove symbol in token array */
276 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
277 ts
= table_ident
[(v
& ~SYM_STRUCT
) - TOK_IDENT
];
279 ps
= &ts
->sym_struct
;
281 ps
= &ts
->sym_identifier
;
290 static void weaken_symbol(Sym
*sym
)
292 sym
->type
.t
|= VT_WEAK
;
297 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
298 esym_type
= ELFW(ST_TYPE
)(esym
->st_info
);
299 esym
->st_info
= ELFW(ST_INFO
)(STB_WEAK
, esym_type
);
303 static void apply_visibility(Sym
*sym
, CType
*type
)
305 int vis
= sym
->type
.t
& VT_VIS_MASK
;
306 int vis2
= type
->t
& VT_VIS_MASK
;
307 if (vis
== (STV_DEFAULT
<< VT_VIS_SHIFT
))
309 else if (vis2
== (STV_DEFAULT
<< VT_VIS_SHIFT
))
312 vis
= (vis
< vis2
) ? vis
: vis2
;
313 sym
->type
.t
&= ~VT_VIS_MASK
;
319 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
320 vis
>>= VT_VIS_SHIFT
;
321 esym
->st_other
= (esym
->st_other
& ~ELFW(ST_VISIBILITY
)(-1)) | vis
;
325 /* ------------------------------------------------------------------------- */
327 ST_FUNC
void swap(int *p
, int *q
)
335 static void vsetc(CType
*type
, int r
, CValue
*vc
)
339 if (vtop
>= vstack
+ (VSTACK_SIZE
- 1))
340 tcc_error("memory full (vstack)");
341 /* cannot let cpu flags if other instruction are generated. Also
342 avoid leaving VT_JMP anywhere except on the top of the stack
343 because it would complicate the code generator. */
344 if (vtop
>= vstack
) {
345 v
= vtop
->r
& VT_VALMASK
;
346 if (v
== VT_CMP
|| (v
& ~1) == VT_JMP
)
356 /* push constant of type "type" with useless value */
357 ST_FUNC
void vpush(CType
*type
)
360 vsetc(type
, VT_CONST
, &cval
);
363 /* push integer constant */
364 ST_FUNC
void vpushi(int v
)
368 vsetc(&int_type
, VT_CONST
, &cval
);
371 /* push a pointer sized constant */
372 static void vpushs(addr_t v
)
376 vsetc(&size_type
, VT_CONST
, &cval
);
379 /* push arbitrary 64bit constant */
380 ST_FUNC
void vpush64(int ty
, unsigned long long v
)
387 vsetc(&ctype
, VT_CONST
, &cval
);
390 /* push long long constant */
391 static inline void vpushll(long long v
)
393 vpush64(VT_LLONG
, v
);
396 /* push a symbol value of TYPE */
397 static inline void vpushsym(CType
*type
, Sym
*sym
)
401 vsetc(type
, VT_CONST
| VT_SYM
, &cval
);
405 /* Return a static symbol pointing to a section */
406 ST_FUNC Sym
*get_sym_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
412 sym
= global_identifier_push(v
, type
->t
| VT_STATIC
, 0);
413 sym
->type
.ref
= type
->ref
;
414 sym
->r
= VT_CONST
| VT_SYM
;
415 put_extern_sym(sym
, sec
, offset
, size
);
419 /* push a reference to a section offset by adding a dummy symbol */
420 static void vpush_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
422 vpushsym(type
, get_sym_ref(type
, sec
, offset
, size
));
425 /* define a new external reference to a symbol 'v' of type 'u' */
426 ST_FUNC Sym
*external_global_sym(int v
, CType
*type
, int r
)
432 /* push forward reference */
433 s
= global_identifier_push(v
, type
->t
| VT_EXTERN
, 0);
434 s
->type
.ref
= type
->ref
;
435 s
->r
= r
| VT_CONST
| VT_SYM
;
440 /* define a new external reference to a symbol 'v' with alternate asm
441 name 'asm_label' of type 'u'. 'asm_label' is equal to NULL if there
442 is no alternate name (most cases) */
443 static Sym
*external_sym(int v
, CType
*type
, int r
, char *asm_label
)
449 /* push forward reference */
450 s
= sym_push(v
, type
, r
| VT_CONST
| VT_SYM
, 0);
451 s
->asm_label
= asm_label
;
452 s
->type
.t
|= VT_EXTERN
;
453 } else if (s
->type
.ref
== func_old_type
.ref
) {
454 s
->type
.ref
= type
->ref
;
455 s
->r
= r
| VT_CONST
| VT_SYM
;
456 s
->type
.t
|= VT_EXTERN
;
457 } else if (!is_compatible_types(&s
->type
, type
)) {
458 tcc_error("incompatible types for redefinition of '%s'",
459 get_tok_str(v
, NULL
));
461 /* Merge some storage attributes. */
462 if (type
->t
& VT_WEAK
)
465 if (type
->t
& VT_VIS_MASK
)
466 apply_visibility(s
, type
);
471 /* push a reference to global symbol v */
472 ST_FUNC
void vpush_global_sym(CType
*type
, int v
)
474 vpushsym(type
, external_global_sym(v
, type
, 0));
477 ST_FUNC
void vset(CType
*type
, int r
, int v
)
482 vsetc(type
, r
, &cval
);
485 static void vseti(int r
, int v
)
493 ST_FUNC
void vswap(void)
496 /* cannot let cpu flags if other instruction are generated. Also
497 avoid leaving VT_JMP anywhere except on the top of the stack
498 because it would complicate the code generator. */
499 if (vtop
>= vstack
) {
500 int v
= vtop
->r
& VT_VALMASK
;
501 if (v
== VT_CMP
|| (v
& ~1) == VT_JMP
)
508 /* XXX: +2% overall speed possible with optimized memswap
510 * memswap(&vtop[0], &vtop[1], sizeof *vtop);
514 ST_FUNC
void vpushv(SValue
*v
)
516 if (vtop
>= vstack
+ (VSTACK_SIZE
- 1))
517 tcc_error("memory full (vstack)");
522 static void vdup(void)
527 /* save r to the memory stack, and mark it as being free */
528 ST_FUNC
void save_reg(int r
)
530 int l
, saved
, size
, align
;
534 /* modify all stack values */
537 for(p
=vstack
;p
<=vtop
;p
++) {
538 if ((p
->r
& VT_VALMASK
) == r
||
539 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& (p
->r2
& VT_VALMASK
) == r
)) {
540 /* must save value on stack if not already done */
542 /* NOTE: must reload 'r' because r might be equal to r2 */
543 r
= p
->r
& VT_VALMASK
;
544 /* store register in the stack */
546 if ((p
->r
& VT_LVAL
) ||
547 (!is_float(type
->t
) && (type
->t
& VT_BTYPE
) != VT_LLONG
))
548 #ifdef TCC_TARGET_X86_64
549 type
= &char_pointer_type
;
553 size
= type_size(type
, &align
);
554 loc
= (loc
- size
) & -align
;
556 sv
.r
= VT_LOCAL
| VT_LVAL
;
559 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
560 /* x86 specific: need to pop fp register ST0 if saved */
562 o(0xd8dd); /* fstp %st(0) */
565 #ifndef TCC_TARGET_X86_64
566 /* special long long case */
567 if ((type
->t
& VT_BTYPE
) == VT_LLONG
) {
575 /* mark that stack entry as being saved on the stack */
576 if (p
->r
& VT_LVAL
) {
577 /* also clear the bounded flag because the
578 relocation address of the function was stored in
580 p
->r
= (p
->r
& ~(VT_VALMASK
| VT_BOUNDED
)) | VT_LLOCAL
;
582 p
->r
= lvalue_type(p
->type
.t
) | VT_LOCAL
;
590 #ifdef TCC_TARGET_ARM
591 /* find a register of class 'rc2' with at most one reference on stack.
592 * If none, call get_reg(rc) */
593 ST_FUNC
int get_reg_ex(int rc
, int rc2
)
598 for(r
=0;r
<NB_REGS
;r
++) {
599 if (reg_classes
[r
] & rc2
) {
602 for(p
= vstack
; p
<= vtop
; p
++) {
603 if ((p
->r
& VT_VALMASK
) == r
||
604 (p
->r2
& VT_VALMASK
) == r
)
615 /* find a free register of class 'rc'. If none, save one register */
616 ST_FUNC
int get_reg(int rc
)
621 /* find a free register */
622 for(r
=0;r
<NB_REGS
;r
++) {
623 if (reg_classes
[r
] & rc
) {
624 for(p
=vstack
;p
<=vtop
;p
++) {
625 if ((p
->r
& VT_VALMASK
) == r
||
626 (p
->r2
& VT_VALMASK
) == r
)
634 /* no register left : free the first one on the stack (VERY
635 IMPORTANT to start from the bottom to ensure that we don't
636 spill registers used in gen_opi()) */
637 for(p
=vstack
;p
<=vtop
;p
++) {
638 /* look at second register (if long long) */
639 r
= p
->r2
& VT_VALMASK
;
640 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
))
642 r
= p
->r
& VT_VALMASK
;
643 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
)) {
649 /* Should never comes here */
653 /* save registers up to (vtop - n) stack entry */
654 ST_FUNC
void save_regs(int n
)
659 for(p
= vstack
;p
<= p1
; p
++) {
660 r
= p
->r
& VT_VALMASK
;
667 /* move register 's' (of type 't') to 'r', and flush previous value of r to memory
669 static void move_reg(int r
, int s
, int t
)
683 /* get address of vtop (vtop MUST BE an lvalue) */
684 static void gaddrof(void)
686 if (vtop
->r
& VT_REF
)
689 /* tricky: if saved lvalue, then we can go back to lvalue */
690 if ((vtop
->r
& VT_VALMASK
) == VT_LLOCAL
)
691 vtop
->r
= (vtop
->r
& ~(VT_VALMASK
| VT_LVAL_TYPE
)) | VT_LOCAL
| VT_LVAL
;
696 #ifdef CONFIG_TCC_BCHECK
697 /* generate lvalue bound code */
698 static void gbound(void)
703 vtop
->r
&= ~VT_MUSTBOUND
;
704 /* if lvalue, then use checking code before dereferencing */
705 if (vtop
->r
& VT_LVAL
) {
706 /* if not VT_BOUNDED value, then make one */
707 if (!(vtop
->r
& VT_BOUNDED
)) {
708 lval_type
= vtop
->r
& (VT_LVAL_TYPE
| VT_LVAL
);
709 /* must save type because we must set it to int to get pointer */
711 vtop
->type
.t
= VT_INT
;
714 gen_bounded_ptr_add();
715 vtop
->r
|= lval_type
;
718 /* then check for dereferencing */
719 gen_bounded_ptr_deref();
724 /* store vtop a register belonging to class 'rc'. lvalues are
725 converted to values. Cannot be used if cannot be converted to
726 register value (such as structures). */
727 ST_FUNC
int gv(int rc
)
729 int r
, bit_pos
, bit_size
, size
, align
, i
;
732 /* NOTE: get_reg can modify vstack[] */
733 if (vtop
->type
.t
& VT_BITFIELD
) {
736 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
737 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
738 /* remove bit field info to avoid loops */
739 vtop
->type
.t
&= ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
));
740 /* cast to int to propagate signedness in following ops */
741 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
746 if((vtop
->type
.t
& VT_UNSIGNED
) ||
747 (vtop
->type
.t
& VT_BTYPE
) == VT_BOOL
)
748 type
.t
|= VT_UNSIGNED
;
750 /* generate shifts */
751 vpushi(bits
- (bit_pos
+ bit_size
));
753 vpushi(bits
- bit_size
);
754 /* NOTE: transformed to SHR if unsigned */
758 if (is_float(vtop
->type
.t
) &&
759 (vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
762 unsigned long offset
;
763 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
767 /* XXX: unify with initializers handling ? */
768 /* CPUs usually cannot use float constants, so we store them
769 generically in data segment */
770 size
= type_size(&vtop
->type
, &align
);
771 offset
= (data_section
->data_offset
+ align
- 1) & -align
;
772 data_section
->data_offset
= offset
;
773 /* XXX: not portable yet */
774 #if defined(__i386__) || defined(__x86_64__)
775 /* Zero pad x87 tenbyte long doubles */
776 if (size
== LDOUBLE_SIZE
) {
777 vtop
->c
.tab
[2] &= 0xffff;
778 #if LDOUBLE_SIZE == 16
783 ptr
= section_ptr_add(data_section
, size
);
785 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
789 ptr
[i
] = vtop
->c
.tab
[size
-1-i
];
793 ptr
[i
] = vtop
->c
.tab
[i
];
794 sym
= get_sym_ref(&vtop
->type
, data_section
, offset
, size
<< 2);
795 vtop
->r
|= VT_LVAL
| VT_SYM
;
797 vtop
->c
.ptr_offset
= 0;
799 #ifdef CONFIG_TCC_BCHECK
800 if (vtop
->r
& VT_MUSTBOUND
)
804 r
= vtop
->r
& VT_VALMASK
;
805 rc2
= (rc
& RC_FLOAT
) ? RC_FLOAT
: RC_INT
;
808 #ifdef TCC_TARGET_X86_64
809 else if (rc
== RC_FRET
)
813 /* need to reload if:
815 - lvalue (need to dereference pointer)
816 - already a register, but not in the right class */
818 || (vtop
->r
& VT_LVAL
)
819 || !(reg_classes
[r
] & rc
)
820 #ifdef TCC_TARGET_X86_64
821 || ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
&& !(reg_classes
[vtop
->r2
] & rc2
))
822 || ((vtop
->type
.t
& VT_BTYPE
) == VT_QFLOAT
&& !(reg_classes
[vtop
->r2
] & rc2
))
824 || ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
&& !(reg_classes
[vtop
->r2
] & rc2
))
829 #ifdef TCC_TARGET_X86_64
830 if (((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) || ((vtop
->type
.t
& VT_BTYPE
) == VT_QFLOAT
)) {
831 int addr_type
= VT_LLONG
, load_size
= 8, load_type
= ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) ? VT_LLONG
: VT_DOUBLE
;
833 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
834 int addr_type
= VT_INT
, load_size
= 4, load_type
= VT_INT
;
835 unsigned long long ll
;
837 int r2
, original_type
;
838 original_type
= vtop
->type
.t
;
839 /* two register type load : expand to two words
841 #ifndef TCC_TARGET_X86_64
842 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
845 vtop
->c
.ui
= ll
; /* first word */
847 vtop
->r
= r
; /* save register value */
848 vpushi(ll
>> 32); /* second word */
851 if (r
>= VT_CONST
|| /* XXX: test to VT_CONST incorrect ? */
852 (vtop
->r
& VT_LVAL
)) {
853 /* We do not want to modifier the long long
854 pointer here, so the safest (and less
855 efficient) is to save all the other registers
856 in the stack. XXX: totally inefficient. */
858 /* load from memory */
859 vtop
->type
.t
= load_type
;
862 vtop
[-1].r
= r
; /* save register value */
863 /* increment pointer to get second word */
864 vtop
->type
.t
= addr_type
;
869 vtop
->type
.t
= load_type
;
874 vtop
[-1].r
= r
; /* save register value */
875 vtop
->r
= vtop
[-1].r2
;
877 /* Allocate second register. Here we rely on the fact that
878 get_reg() tries first to free r2 of an SValue. */
882 /* write second register */
884 vtop
->type
.t
= original_type
;
885 } else if ((vtop
->r
& VT_LVAL
) && !is_float(vtop
->type
.t
)) {
887 /* lvalue of scalar type : need to use lvalue type
888 because of possible cast */
891 /* compute memory access type */
892 if (vtop
->r
& VT_REF
)
893 #ifdef TCC_TARGET_X86_64
898 else if (vtop
->r
& VT_LVAL_BYTE
)
900 else if (vtop
->r
& VT_LVAL_SHORT
)
902 if (vtop
->r
& VT_LVAL_UNSIGNED
)
906 /* restore wanted type */
909 /* one register type load */
914 #ifdef TCC_TARGET_C67
915 /* uses register pairs for doubles */
916 if ((vtop
->type
.t
& VT_BTYPE
) == VT_DOUBLE
)
923 /* generate vtop[-1] and vtop[0] in resp. classes rc1 and rc2 */
924 ST_FUNC
void gv2(int rc1
, int rc2
)
928 /* generate more generic register first. But VT_JMP or VT_CMP
929 values must be generated first in all cases to avoid possible
931 v
= vtop
[0].r
& VT_VALMASK
;
932 if (v
!= VT_CMP
&& (v
& ~1) != VT_JMP
&& rc1
<= rc2
) {
937 /* test if reload is needed for first register */
938 if ((vtop
[-1].r
& VT_VALMASK
) >= VT_CONST
) {
948 /* test if reload is needed for first register */
949 if ((vtop
[0].r
& VT_VALMASK
) >= VT_CONST
) {
955 /* wrapper around RC_FRET to return a register by type */
956 static int rc_fret(int t
)
958 #ifdef TCC_TARGET_X86_64
959 if (t
== VT_LDOUBLE
) {
966 /* wrapper around REG_FRET to return a register by type */
967 static int reg_fret(int t
)
969 #ifdef TCC_TARGET_X86_64
970 if (t
== VT_LDOUBLE
) {
977 /* expand long long on stack in two int registers */
978 static void lexpand(void)
982 u
= vtop
->type
.t
& (VT_DEFSIGN
| VT_UNSIGNED
);
985 vtop
[0].r
= vtop
[-1].r2
;
986 vtop
[0].r2
= VT_CONST
;
987 vtop
[-1].r2
= VT_CONST
;
988 vtop
[0].type
.t
= VT_INT
| u
;
989 vtop
[-1].type
.t
= VT_INT
| u
;
992 #ifdef TCC_TARGET_ARM
993 /* expand long long on stack */
994 ST_FUNC
void lexpand_nr(void)
998 u
= vtop
->type
.t
& (VT_DEFSIGN
| VT_UNSIGNED
);
1000 vtop
->r2
= VT_CONST
;
1001 vtop
->type
.t
= VT_INT
| u
;
1002 v
=vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
);
1003 if (v
== VT_CONST
) {
1004 vtop
[-1].c
.ui
= vtop
->c
.ull
;
1005 vtop
->c
.ui
= vtop
->c
.ull
>> 32;
1007 } else if (v
== (VT_LVAL
|VT_CONST
) || v
== (VT_LVAL
|VT_LOCAL
)) {
1009 vtop
->r
= vtop
[-1].r
;
1010 } else if (v
> VT_CONST
) {
1014 vtop
->r
= vtop
[-1].r2
;
1015 vtop
[-1].r2
= VT_CONST
;
1016 vtop
[-1].type
.t
= VT_INT
| u
;
1020 /* build a long long from two ints */
1021 static void lbuild(int t
)
1023 gv2(RC_INT
, RC_INT
);
1024 vtop
[-1].r2
= vtop
[0].r
;
1025 vtop
[-1].type
.t
= t
;
1029 /* rotate n first stack elements to the bottom
1030 I1 ... In -> I2 ... In I1 [top is right]
1032 ST_FUNC
void vrotb(int n
)
1038 for(i
=-n
+1;i
!=0;i
++)
1039 vtop
[i
] = vtop
[i
+1];
1043 /* rotate the n elements before entry e towards the top
1044 I1 ... In ... -> In I1 ... I(n-1) ... [top is right]
1046 ST_FUNC
void vrote(SValue
*e
, int n
)
1052 for(i
= 0;i
< n
- 1; i
++)
1057 /* rotate n first stack elements to the top
1058 I1 ... In -> In I1 ... I(n-1) [top is right]
1060 ST_FUNC
void vrott(int n
)
1065 /* pop stack value */
1066 ST_FUNC
void vpop(void)
1069 v
= vtop
->r
& VT_VALMASK
;
1070 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
1071 /* for x86, we need to pop the FP stack */
1072 if (v
== TREG_ST0
&& !nocode_wanted
) {
1073 o(0xd8dd); /* fstp %st(0) */
1076 if (v
== VT_JMP
|| v
== VT_JMPI
) {
1077 /* need to put correct jump if && or || without test */
1083 /* convert stack entry to register and duplicate its value in another
1085 static void gv_dup(void)
1091 if ((t
& VT_BTYPE
) == VT_LLONG
) {
1098 /* stack: H L L1 H1 */
1106 /* duplicate value */
1111 #ifdef TCC_TARGET_X86_64
1112 if ((t
& VT_BTYPE
) == VT_LDOUBLE
) {
1122 load(r1
, &sv
); /* move r to r1 */
1124 /* duplicates value */
1130 /* Generate value test
1132 * Generate a test for any value (jump, comparison and integers) */
1133 ST_FUNC
int gvtst(int inv
, int t
)
1135 int v
= vtop
->r
& VT_VALMASK
;
1136 if (v
!= VT_CMP
&& v
!= VT_JMP
&& v
!= VT_JMPI
) {
1140 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
1141 /* constant jmp optimization */
1142 if ((vtop
->c
.i
!= 0) != inv
)
1147 return gtst(inv
, t
);
1150 #ifndef TCC_TARGET_X86_64
1151 /* generate CPU independent (unsigned) long long operations */
1152 static void gen_opl(int op
)
1154 int t
, a
, b
, op1
, c
, i
;
1156 unsigned short reg_iret
= REG_IRET
;
1157 unsigned short reg_lret
= REG_LRET
;
1163 func
= TOK___divdi3
;
1166 func
= TOK___udivdi3
;
1169 func
= TOK___moddi3
;
1172 func
= TOK___umoddi3
;
1179 /* call generic long long function */
1180 vpush_global_sym(&func_old_type
, func
);
1185 vtop
->r2
= reg_lret
;
1198 /* stack: L1 H1 L2 H2 */
1203 vtop
[-2] = vtop
[-3];
1206 /* stack: H1 H2 L1 L2 */
1212 /* stack: H1 H2 L1 L2 ML MH */
1215 /* stack: ML MH H1 H2 L1 L2 */
1219 /* stack: ML MH H1 L2 H2 L1 */
1224 /* stack: ML MH M1 M2 */
1227 } else if (op
== '+' || op
== '-') {
1228 /* XXX: add non carry method too (for MIPS or alpha) */
1234 /* stack: H1 H2 (L1 op L2) */
1237 gen_op(op1
+ 1); /* TOK_xxxC2 */
1240 /* stack: H1 H2 (L1 op L2) */
1243 /* stack: (L1 op L2) H1 H2 */
1245 /* stack: (L1 op L2) (H1 op H2) */
1253 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
1254 t
= vtop
[-1].type
.t
;
1258 /* stack: L H shift */
1260 /* constant: simpler */
1261 /* NOTE: all comments are for SHL. the other cases are
1262 done by swaping words */
1273 if (op
!= TOK_SAR
) {
1306 /* XXX: should provide a faster fallback on x86 ? */
1309 func
= TOK___ashrdi3
;
1312 func
= TOK___lshrdi3
;
1315 func
= TOK___ashldi3
;
1321 /* compare operations */
1327 /* stack: L1 H1 L2 H2 */
1329 vtop
[-1] = vtop
[-2];
1331 /* stack: L1 L2 H1 H2 */
1334 /* when values are equal, we need to compare low words. since
1335 the jump is inverted, we invert the test too. */
1338 else if (op1
== TOK_GT
)
1340 else if (op1
== TOK_ULT
)
1342 else if (op1
== TOK_UGT
)
1347 if (op1
!= TOK_NE
) {
1351 /* generate non equal test */
1352 /* XXX: NOT PORTABLE yet */
1356 #if defined(TCC_TARGET_I386)
1357 b
= psym(0x850f, 0);
1358 #elif defined(TCC_TARGET_ARM)
1360 o(0x1A000000 | encbranch(ind
, 0, 1));
1361 #elif defined(TCC_TARGET_C67)
1362 tcc_error("not implemented");
1364 #error not supported
1368 /* compare low. Always unsigned */
1372 else if (op1
== TOK_LE
)
1374 else if (op1
== TOK_GT
)
1376 else if (op1
== TOK_GE
)
1387 /* handle integer constant optimizations and various machine
1389 static void gen_opic(int op
)
1391 int c1
, c2
, t1
, t2
, n
;
1394 typedef unsigned long long U
;
1398 t1
= v1
->type
.t
& VT_BTYPE
;
1399 t2
= v2
->type
.t
& VT_BTYPE
;
1403 else if (v1
->type
.t
& VT_UNSIGNED
)
1410 else if (v2
->type
.t
& VT_UNSIGNED
)
1415 /* currently, we cannot do computations with forward symbols */
1416 c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1417 c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1420 case '+': l1
+= l2
; break;
1421 case '-': l1
-= l2
; break;
1422 case '&': l1
&= l2
; break;
1423 case '^': l1
^= l2
; break;
1424 case '|': l1
|= l2
; break;
1425 case '*': l1
*= l2
; break;
1432 /* if division by zero, generate explicit division */
1435 tcc_error("division by zero in constant");
1439 default: l1
/= l2
; break;
1440 case '%': l1
%= l2
; break;
1441 case TOK_UDIV
: l1
= (U
)l1
/ l2
; break;
1442 case TOK_UMOD
: l1
= (U
)l1
% l2
; break;
1445 case TOK_SHL
: l1
<<= l2
; break;
1446 case TOK_SHR
: l1
= (U
)l1
>> l2
; break;
1447 case TOK_SAR
: l1
>>= l2
; break;
1449 case TOK_ULT
: l1
= (U
)l1
< (U
)l2
; break;
1450 case TOK_UGE
: l1
= (U
)l1
>= (U
)l2
; break;
1451 case TOK_EQ
: l1
= l1
== l2
; break;
1452 case TOK_NE
: l1
= l1
!= l2
; break;
1453 case TOK_ULE
: l1
= (U
)l1
<= (U
)l2
; break;
1454 case TOK_UGT
: l1
= (U
)l1
> (U
)l2
; break;
1455 case TOK_LT
: l1
= l1
< l2
; break;
1456 case TOK_GE
: l1
= l1
>= l2
; break;
1457 case TOK_LE
: l1
= l1
<= l2
; break;
1458 case TOK_GT
: l1
= l1
> l2
; break;
1460 case TOK_LAND
: l1
= l1
&& l2
; break;
1461 case TOK_LOR
: l1
= l1
|| l2
; break;
1468 /* if commutative ops, put c2 as constant */
1469 if (c1
&& (op
== '+' || op
== '&' || op
== '^' ||
1470 op
== '|' || op
== '*')) {
1472 c2
= c1
; //c = c1, c1 = c2, c2 = c;
1473 l2
= l1
; //l = l1, l1 = l2, l2 = l;
1475 /* Filter out NOP operations like x*1, x-0, x&-1... */
1476 if (c2
&& (((op
== '*' || op
== '/' || op
== TOK_UDIV
||
1479 ((op
== '+' || op
== '-' || op
== '|' || op
== '^' ||
1480 op
== TOK_SHL
|| op
== TOK_SHR
|| op
== TOK_SAR
) &&
1486 } else if (c2
&& (op
== '*' || op
== TOK_PDIV
|| op
== TOK_UDIV
)) {
1487 /* try to use shifts instead of muls or divs */
1488 if (l2
> 0 && (l2
& (l2
- 1)) == 0) {
1497 else if (op
== TOK_PDIV
)
1503 } else if (c2
&& (op
== '+' || op
== '-') &&
1504 (((vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
))
1505 || (vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
)) == VT_LOCAL
)) {
1506 /* symbol + constant case */
1513 if (!nocode_wanted
) {
1514 /* call low level op generator */
1515 if (t1
== VT_LLONG
|| t2
== VT_LLONG
)
1526 /* generate a floating point operation with constant propagation */
1527 static void gen_opif(int op
)
1535 /* currently, we cannot do computations with forward symbols */
1536 c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1537 c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1539 if (v1
->type
.t
== VT_FLOAT
) {
1542 } else if (v1
->type
.t
== VT_DOUBLE
) {
1550 /* NOTE: we only do constant propagation if finite number (not
1551 NaN or infinity) (ANSI spec) */
1552 if (!ieee_finite(f1
) || !ieee_finite(f2
))
1556 case '+': f1
+= f2
; break;
1557 case '-': f1
-= f2
; break;
1558 case '*': f1
*= f2
; break;
1562 tcc_error("division by zero in constant");
1567 /* XXX: also handles tests ? */
1571 /* XXX: overflow test ? */
1572 if (v1
->type
.t
== VT_FLOAT
) {
1574 } else if (v1
->type
.t
== VT_DOUBLE
) {
1582 if (!nocode_wanted
) {
1590 static int pointed_size(CType
*type
)
1593 return type_size(pointed_type(type
), &align
);
1596 static void vla_runtime_pointed_size(CType
*type
)
1599 vla_runtime_type_size(pointed_type(type
), &align
);
1602 static inline int is_null_pointer(SValue
*p
)
1604 if ((p
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
1606 return ((p
->type
.t
& VT_BTYPE
) == VT_INT
&& p
->c
.i
== 0) ||
1607 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& p
->c
.ll
== 0) ||
1608 ((p
->type
.t
& VT_BTYPE
) == VT_PTR
&& p
->c
.ptr_offset
== 0);
1611 static inline int is_integer_btype(int bt
)
1613 return (bt
== VT_BYTE
|| bt
== VT_SHORT
||
1614 bt
== VT_INT
|| bt
== VT_LLONG
);
1617 /* check types for comparison or subtraction of pointers */
1618 static void check_comparison_pointer_types(SValue
*p1
, SValue
*p2
, int op
)
1620 CType
*type1
, *type2
, tmp_type1
, tmp_type2
;
1623 /* null pointers are accepted for all comparisons as gcc */
1624 if (is_null_pointer(p1
) || is_null_pointer(p2
))
1628 bt1
= type1
->t
& VT_BTYPE
;
1629 bt2
= type2
->t
& VT_BTYPE
;
1630 /* accept comparison between pointer and integer with a warning */
1631 if ((is_integer_btype(bt1
) || is_integer_btype(bt2
)) && op
!= '-') {
1632 if (op
!= TOK_LOR
&& op
!= TOK_LAND
)
1633 tcc_warning("comparison between pointer and integer");
1637 /* both must be pointers or implicit function pointers */
1638 if (bt1
== VT_PTR
) {
1639 type1
= pointed_type(type1
);
1640 } else if (bt1
!= VT_FUNC
)
1641 goto invalid_operands
;
1643 if (bt2
== VT_PTR
) {
1644 type2
= pointed_type(type2
);
1645 } else if (bt2
!= VT_FUNC
) {
1647 tcc_error("invalid operands to binary %s", get_tok_str(op
, NULL
));
1649 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
1650 (type2
->t
& VT_BTYPE
) == VT_VOID
)
1654 tmp_type1
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1655 tmp_type2
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1656 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
1657 /* gcc-like error if '-' is used */
1659 goto invalid_operands
;
1661 tcc_warning("comparison of distinct pointer types lacks a cast");
1665 /* generic gen_op: handles types problems */
1666 ST_FUNC
void gen_op(int op
)
1668 int u
, t1
, t2
, bt1
, bt2
, t
;
1671 t1
= vtop
[-1].type
.t
;
1672 t2
= vtop
[0].type
.t
;
1673 bt1
= t1
& VT_BTYPE
;
1674 bt2
= t2
& VT_BTYPE
;
1676 if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
1677 /* at least one operand is a pointer */
1678 /* relationnal op: must be both pointers */
1679 if (op
>= TOK_ULT
&& op
<= TOK_LOR
) {
1680 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1681 /* pointers are handled are unsigned */
1682 #ifdef TCC_TARGET_X86_64
1683 t
= VT_LLONG
| VT_UNSIGNED
;
1685 t
= VT_INT
| VT_UNSIGNED
;
1689 /* if both pointers, then it must be the '-' op */
1690 if (bt1
== VT_PTR
&& bt2
== VT_PTR
) {
1692 tcc_error("cannot use pointers here");
1693 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1694 /* XXX: check that types are compatible */
1695 if (vtop
[-1].type
.t
& VT_VLA
) {
1696 vla_runtime_pointed_size(&vtop
[-1].type
);
1698 vpushi(pointed_size(&vtop
[-1].type
));
1702 /* set to integer type */
1703 #ifdef TCC_TARGET_X86_64
1704 vtop
->type
.t
= VT_LLONG
;
1706 vtop
->type
.t
= VT_INT
;
1711 /* exactly one pointer : must be '+' or '-'. */
1712 if (op
!= '-' && op
!= '+')
1713 tcc_error("cannot use pointers here");
1714 /* Put pointer as first operand */
1715 if (bt2
== VT_PTR
) {
1719 type1
= vtop
[-1].type
;
1720 type1
.t
&= ~VT_ARRAY
;
1721 if (vtop
[-1].type
.t
& VT_VLA
)
1722 vla_runtime_pointed_size(&vtop
[-1].type
);
1724 u
= pointed_size(&vtop
[-1].type
);
1726 tcc_error("unknown array element size");
1727 #ifdef TCC_TARGET_X86_64
1730 /* XXX: cast to int ? (long long case) */
1735 #ifdef CONFIG_TCC_BCHECK
1736 /* if evaluating constant expression, no code should be
1737 generated, so no bound check */
1738 if (tcc_state
->do_bounds_check
&& !const_wanted
) {
1739 /* if bounded pointers, we generate a special code to
1746 gen_bounded_ptr_add();
1752 /* put again type if gen_opic() swaped operands */
1755 } else if (is_float(bt1
) || is_float(bt2
)) {
1756 /* compute bigger type and do implicit casts */
1757 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
1759 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
1764 /* floats can only be used for a few operations */
1765 if (op
!= '+' && op
!= '-' && op
!= '*' && op
!= '/' &&
1766 (op
< TOK_ULT
|| op
> TOK_GT
))
1767 tcc_error("invalid operands for binary operation");
1769 } else if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
) {
1770 t
= bt1
== VT_LLONG
? VT_LLONG
: VT_INT
;
1771 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (t
| VT_UNSIGNED
))
1774 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
1775 /* cast to biggest op */
1777 /* convert to unsigned if it does not fit in a long long */
1778 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
1779 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
1782 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
1783 tcc_error("comparison of struct");
1785 /* integer operations */
1787 /* convert to unsigned if it does not fit in an integer */
1788 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
1789 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
1792 /* XXX: currently, some unsigned operations are explicit, so
1793 we modify them here */
1794 if (t
& VT_UNSIGNED
) {
1801 else if (op
== TOK_LT
)
1803 else if (op
== TOK_GT
)
1805 else if (op
== TOK_LE
)
1807 else if (op
== TOK_GE
)
1814 /* special case for shifts and long long: we keep the shift as
1816 if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
)
1823 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
1824 /* relationnal op: the result is an int */
1825 vtop
->type
.t
= VT_INT
;
1832 #ifndef TCC_TARGET_ARM
1833 /* generic itof for unsigned long long case */
1834 static void gen_cvt_itof1(int t
)
1836 if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
1837 (VT_LLONG
| VT_UNSIGNED
)) {
1840 vpush_global_sym(&func_old_type
, TOK___floatundisf
);
1841 #if LDOUBLE_SIZE != 8
1842 else if (t
== VT_LDOUBLE
)
1843 vpush_global_sym(&func_old_type
, TOK___floatundixf
);
1846 vpush_global_sym(&func_old_type
, TOK___floatundidf
);
1850 vtop
->r
= reg_fret(t
);
1857 /* generic ftoi for unsigned long long case */
1858 static void gen_cvt_ftoi1(int t
)
1862 if (t
== (VT_LLONG
| VT_UNSIGNED
)) {
1863 /* not handled natively */
1864 st
= vtop
->type
.t
& VT_BTYPE
;
1866 vpush_global_sym(&func_old_type
, TOK___fixunssfdi
);
1867 #if LDOUBLE_SIZE != 8
1868 else if (st
== VT_LDOUBLE
)
1869 vpush_global_sym(&func_old_type
, TOK___fixunsxfdi
);
1872 vpush_global_sym(&func_old_type
, TOK___fixunsdfdi
);
1877 vtop
->r2
= REG_LRET
;
1883 /* force char or short cast */
1884 static void force_charshort_cast(int t
)
1888 /* XXX: add optimization if lvalue : just change type and offset */
1893 if (t
& VT_UNSIGNED
) {
1894 vpushi((1 << bits
) - 1);
1900 /* result must be signed or the SAR is converted to an SHL
1901 This was not the case when "t" was a signed short
1902 and the last value on the stack was an unsigned int */
1903 vtop
->type
.t
&= ~VT_UNSIGNED
;
1909 /* cast 'vtop' to 'type'. Casting to bitfields is forbidden. */
1910 static void gen_cast(CType
*type
)
1912 int sbt
, dbt
, sf
, df
, c
, p
;
1914 /* special delayed cast for char/short */
1915 /* XXX: in some cases (multiple cascaded casts), it may still
1917 if (vtop
->r
& VT_MUSTCAST
) {
1918 vtop
->r
&= ~VT_MUSTCAST
;
1919 force_charshort_cast(vtop
->type
.t
);
1922 /* bitfields first get cast to ints */
1923 if (vtop
->type
.t
& VT_BITFIELD
) {
1927 dbt
= type
->t
& (VT_BTYPE
| VT_UNSIGNED
);
1928 sbt
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
1933 c
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1934 p
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
);
1936 /* constant case: we can do it now */
1937 /* XXX: in ISOC, cannot do it if error in convert */
1938 if (sbt
== VT_FLOAT
)
1939 vtop
->c
.ld
= vtop
->c
.f
;
1940 else if (sbt
== VT_DOUBLE
)
1941 vtop
->c
.ld
= vtop
->c
.d
;
1944 if ((sbt
& VT_BTYPE
) == VT_LLONG
) {
1945 if (sbt
& VT_UNSIGNED
)
1946 vtop
->c
.ld
= vtop
->c
.ull
;
1948 vtop
->c
.ld
= vtop
->c
.ll
;
1950 if (sbt
& VT_UNSIGNED
)
1951 vtop
->c
.ld
= vtop
->c
.ui
;
1953 vtop
->c
.ld
= vtop
->c
.i
;
1956 if (dbt
== VT_FLOAT
)
1957 vtop
->c
.f
= (float)vtop
->c
.ld
;
1958 else if (dbt
== VT_DOUBLE
)
1959 vtop
->c
.d
= (double)vtop
->c
.ld
;
1960 } else if (sf
&& dbt
== (VT_LLONG
|VT_UNSIGNED
)) {
1961 vtop
->c
.ull
= (unsigned long long)vtop
->c
.ld
;
1962 } else if (sf
&& dbt
== VT_BOOL
) {
1963 vtop
->c
.i
= (vtop
->c
.ld
!= 0);
1966 vtop
->c
.ll
= (long long)vtop
->c
.ld
;
1967 else if (sbt
== (VT_LLONG
|VT_UNSIGNED
))
1968 vtop
->c
.ll
= vtop
->c
.ull
;
1969 else if (sbt
& VT_UNSIGNED
)
1970 vtop
->c
.ll
= vtop
->c
.ui
;
1971 #ifdef TCC_TARGET_X86_64
1972 else if (sbt
== VT_PTR
)
1975 else if (sbt
!= VT_LLONG
)
1976 vtop
->c
.ll
= vtop
->c
.i
;
1978 if (dbt
== (VT_LLONG
|VT_UNSIGNED
))
1979 vtop
->c
.ull
= vtop
->c
.ll
;
1980 else if (dbt
== VT_BOOL
)
1981 vtop
->c
.i
= (vtop
->c
.ll
!= 0);
1982 #ifdef TCC_TARGET_X86_64
1983 else if (dbt
== VT_PTR
)
1986 else if (dbt
!= VT_LLONG
) {
1988 if ((dbt
& VT_BTYPE
) == VT_BYTE
)
1990 else if ((dbt
& VT_BTYPE
) == VT_SHORT
)
1992 if(dbt
& VT_UNSIGNED
)
1993 vtop
->c
.ui
= ((unsigned int)vtop
->c
.ll
<< s
) >> s
;
1995 vtop
->c
.i
= ((int)vtop
->c
.ll
<< s
) >> s
;
1998 } else if (p
&& dbt
== VT_BOOL
) {
2001 } else if (!nocode_wanted
) {
2002 /* non constant case: generate code */
2004 /* convert from fp to fp */
2007 /* convert int to fp */
2010 /* convert fp to int */
2011 if (dbt
== VT_BOOL
) {
2015 /* we handle char/short/etc... with generic code */
2016 if (dbt
!= (VT_INT
| VT_UNSIGNED
) &&
2017 dbt
!= (VT_LLONG
| VT_UNSIGNED
) &&
2021 if (dbt
== VT_INT
&& (type
->t
& (VT_BTYPE
| VT_UNSIGNED
)) != dbt
) {
2022 /* additional cast for char/short... */
2027 #ifndef TCC_TARGET_X86_64
2028 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
) {
2029 if ((sbt
& VT_BTYPE
) != VT_LLONG
) {
2030 /* scalar to long long */
2031 /* machine independent conversion */
2033 /* generate high word */
2034 if (sbt
== (VT_INT
| VT_UNSIGNED
)) {
2038 if (sbt
== VT_PTR
) {
2039 /* cast from pointer to int before we apply
2040 shift operation, which pointers don't support*/
2041 gen_cast(&int_type
);
2047 /* patch second register */
2048 vtop
[-1].r2
= vtop
->r
;
2052 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
||
2053 (dbt
& VT_BTYPE
) == VT_PTR
||
2054 (dbt
& VT_BTYPE
) == VT_FUNC
) {
2055 if ((sbt
& VT_BTYPE
) != VT_LLONG
&&
2056 (sbt
& VT_BTYPE
) != VT_PTR
&&
2057 (sbt
& VT_BTYPE
) != VT_FUNC
) {
2058 /* need to convert from 32bit to 64bit */
2060 if (sbt
!= (VT_INT
| VT_UNSIGNED
)) {
2061 /* x86_64 specific: movslq */
2063 o(0xc0 + (REG_VALUE(r
) << 3) + REG_VALUE(r
));
2067 } else if (dbt
== VT_BOOL
) {
2068 /* scalar to bool */
2071 } else if ((dbt
& VT_BTYPE
) == VT_BYTE
||
2072 (dbt
& VT_BTYPE
) == VT_SHORT
) {
2073 if (sbt
== VT_PTR
) {
2074 vtop
->type
.t
= VT_INT
;
2075 tcc_warning("nonportable conversion from pointer to char/short");
2077 force_charshort_cast(dbt
);
2078 } else if ((dbt
& VT_BTYPE
) == VT_INT
) {
2080 if (sbt
== VT_LLONG
) {
2081 /* from long long: just take low order word */
2085 /* if lvalue and single word type, nothing to do because
2086 the lvalue already contains the real type size (see
2087 VT_LVAL_xxx constants) */
2090 } else if ((dbt
& VT_BTYPE
) == VT_PTR
&& !(vtop
->r
& VT_LVAL
)) {
2091 /* if we are casting between pointer types,
2092 we must update the VT_LVAL_xxx size */
2093 vtop
->r
= (vtop
->r
& ~VT_LVAL_TYPE
)
2094 | (lvalue_type(type
->ref
->type
.t
) & VT_LVAL_TYPE
);
2099 /* return type size as known at compile time. Put alignment at 'a' */
2100 ST_FUNC
int type_size(CType
*type
, int *a
)
2105 bt
= type
->t
& VT_BTYPE
;
2106 if (bt
== VT_STRUCT
) {
2111 } else if (bt
== VT_PTR
) {
2112 if (type
->t
& VT_ARRAY
) {
2116 ts
= type_size(&s
->type
, a
);
2118 if (ts
< 0 && s
->c
< 0)
2126 } else if (bt
== VT_LDOUBLE
) {
2128 return LDOUBLE_SIZE
;
2129 } else if (bt
== VT_DOUBLE
|| bt
== VT_LLONG
) {
2130 #ifdef TCC_TARGET_I386
2131 #ifdef TCC_TARGET_PE
2136 #elif defined(TCC_TARGET_ARM)
2146 } else if (bt
== VT_INT
|| bt
== VT_ENUM
|| bt
== VT_FLOAT
) {
2149 } else if (bt
== VT_SHORT
) {
2152 } else if (bt
== VT_QLONG
|| bt
== VT_QFLOAT
) {
2156 /* char, void, function, _Bool */
2162 /* push type size as known at runtime time on top of value stack. Put
2164 ST_FUNC
void vla_runtime_type_size(CType
*type
, int *a
)
2166 if (type
->t
& VT_VLA
) {
2167 vset(&int_type
, VT_LOCAL
|VT_LVAL
, type
->ref
->c
);
2169 vpushi(type_size(type
, a
));
2173 static void vla_sp_save(void) {
2174 if (!(vla_flags
& VLA_SP_LOC_SET
)) {
2175 *vla_sp_loc
= (loc
-= PTR_SIZE
);
2176 vla_flags
|= VLA_SP_LOC_SET
;
2178 if (!(vla_flags
& VLA_SP_SAVED
)) {
2179 gen_vla_sp_save(*vla_sp_loc
);
2180 vla_flags
|= VLA_SP_SAVED
;
2184 /* return the pointed type of t */
2185 static inline CType
*pointed_type(CType
*type
)
2187 return &type
->ref
->type
;
2190 /* modify type so that its it is a pointer to type. */
2191 ST_FUNC
void mk_pointer(CType
*type
)
2194 s
= sym_push(SYM_FIELD
, type
, 0, -1);
2195 type
->t
= VT_PTR
| (type
->t
& ~VT_TYPE
);
2199 /* compare function types. OLD functions match any new functions */
2200 static int is_compatible_func(CType
*type1
, CType
*type2
)
2206 if (!is_compatible_types(&s1
->type
, &s2
->type
))
2208 /* check func_call */
2209 if (s1
->a
.func_call
!= s2
->a
.func_call
)
2211 /* XXX: not complete */
2212 if (s1
->c
== FUNC_OLD
|| s2
->c
== FUNC_OLD
)
2216 while (s1
!= NULL
) {
2219 if (!is_compatible_parameter_types(&s1
->type
, &s2
->type
))
2229 /* return true if type1 and type2 are the same. If unqualified is
2230 true, qualifiers on the types are ignored.
2232 - enums are not checked as gcc __builtin_types_compatible_p ()
2234 static int compare_types(CType
*type1
, CType
*type2
, int unqualified
)
2238 t1
= type1
->t
& VT_TYPE
;
2239 t2
= type2
->t
& VT_TYPE
;
2241 /* strip qualifiers before comparing */
2242 t1
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2243 t2
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2245 /* Default Vs explicit signedness only matters for char */
2246 if ((t1
& VT_BTYPE
) != VT_BYTE
) {
2250 /* XXX: bitfields ? */
2253 /* test more complicated cases */
2254 bt1
= t1
& VT_BTYPE
;
2255 if (bt1
== VT_PTR
) {
2256 type1
= pointed_type(type1
);
2257 type2
= pointed_type(type2
);
2258 return is_compatible_types(type1
, type2
);
2259 } else if (bt1
== VT_STRUCT
) {
2260 return (type1
->ref
== type2
->ref
);
2261 } else if (bt1
== VT_FUNC
) {
2262 return is_compatible_func(type1
, type2
);
2268 /* return true if type1 and type2 are exactly the same (including
2271 static int is_compatible_types(CType
*type1
, CType
*type2
)
2273 return compare_types(type1
,type2
,0);
2276 /* return true if type1 and type2 are the same (ignoring qualifiers).
2278 static int is_compatible_parameter_types(CType
*type1
, CType
*type2
)
2280 return compare_types(type1
,type2
,1);
2283 /* print a type. If 'varstr' is not NULL, then the variable is also
2284 printed in the type */
2286 /* XXX: add array and function pointers */
2287 static void type_to_str(char *buf
, int buf_size
,
2288 CType
*type
, const char *varstr
)
2295 t
= type
->t
& VT_TYPE
;
2298 if (t
& VT_CONSTANT
)
2299 pstrcat(buf
, buf_size
, "const ");
2300 if (t
& VT_VOLATILE
)
2301 pstrcat(buf
, buf_size
, "volatile ");
2302 if ((t
& (VT_DEFSIGN
| VT_UNSIGNED
)) == (VT_DEFSIGN
| VT_UNSIGNED
))
2303 pstrcat(buf
, buf_size
, "unsigned ");
2304 else if (t
& VT_DEFSIGN
)
2305 pstrcat(buf
, buf_size
, "signed ");
2335 tstr
= "long double";
2337 pstrcat(buf
, buf_size
, tstr
);
2341 if (bt
== VT_STRUCT
)
2345 pstrcat(buf
, buf_size
, tstr
);
2346 v
= type
->ref
->v
& ~SYM_STRUCT
;
2347 if (v
>= SYM_FIRST_ANOM
)
2348 pstrcat(buf
, buf_size
, "<anonymous>");
2350 pstrcat(buf
, buf_size
, get_tok_str(v
, NULL
));
2354 type_to_str(buf
, buf_size
, &s
->type
, varstr
);
2355 pstrcat(buf
, buf_size
, "(");
2357 while (sa
!= NULL
) {
2358 type_to_str(buf1
, sizeof(buf1
), &sa
->type
, NULL
);
2359 pstrcat(buf
, buf_size
, buf1
);
2362 pstrcat(buf
, buf_size
, ", ");
2364 pstrcat(buf
, buf_size
, ")");
2368 pstrcpy(buf1
, sizeof(buf1
), "*");
2370 pstrcat(buf1
, sizeof(buf1
), varstr
);
2371 type_to_str(buf
, buf_size
, &s
->type
, buf1
);
2375 pstrcat(buf
, buf_size
, " ");
2376 pstrcat(buf
, buf_size
, varstr
);
2381 /* verify type compatibility to store vtop in 'dt' type, and generate
2383 static void gen_assign_cast(CType
*dt
)
2385 CType
*st
, *type1
, *type2
, tmp_type1
, tmp_type2
;
2386 char buf1
[256], buf2
[256];
2389 st
= &vtop
->type
; /* source type */
2390 dbt
= dt
->t
& VT_BTYPE
;
2391 sbt
= st
->t
& VT_BTYPE
;
2392 if (sbt
== VT_VOID
|| dbt
== VT_VOID
)
2393 tcc_error("cannot cast from/to void");
2394 if (dt
->t
& VT_CONSTANT
)
2395 tcc_warning("assignment of read-only location");
2398 /* special cases for pointers */
2399 /* '0' can also be a pointer */
2400 if (is_null_pointer(vtop
))
2402 /* accept implicit pointer to integer cast with warning */
2403 if (is_integer_btype(sbt
)) {
2404 tcc_warning("assignment makes pointer from integer without a cast");
2407 type1
= pointed_type(dt
);
2408 /* a function is implicitely a function pointer */
2409 if (sbt
== VT_FUNC
) {
2410 if ((type1
->t
& VT_BTYPE
) != VT_VOID
&&
2411 !is_compatible_types(pointed_type(dt
), st
))
2412 tcc_warning("assignment from incompatible pointer type");
2417 type2
= pointed_type(st
);
2418 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
2419 (type2
->t
& VT_BTYPE
) == VT_VOID
) {
2420 /* void * can match anything */
2422 /* exact type match, except for unsigned */
2425 tmp_type1
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
|
2427 tmp_type2
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
|
2429 if (!is_compatible_types(&tmp_type1
, &tmp_type2
))
2430 tcc_warning("assignment from incompatible pointer type");
2432 /* check const and volatile */
2433 if ((!(type1
->t
& VT_CONSTANT
) && (type2
->t
& VT_CONSTANT
)) ||
2434 (!(type1
->t
& VT_VOLATILE
) && (type2
->t
& VT_VOLATILE
)))
2435 tcc_warning("assignment discards qualifiers from pointer target type");
2441 if (sbt
== VT_PTR
|| sbt
== VT_FUNC
) {
2442 tcc_warning("assignment makes integer from pointer without a cast");
2444 /* XXX: more tests */
2449 tmp_type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2450 tmp_type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2451 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
2453 type_to_str(buf1
, sizeof(buf1
), st
, NULL
);
2454 type_to_str(buf2
, sizeof(buf2
), dt
, NULL
);
2455 tcc_error("cannot cast '%s' to '%s'", buf1
, buf2
);
2463 /* store vtop in lvalue pushed on stack */
2464 ST_FUNC
void vstore(void)
2466 int sbt
, dbt
, ft
, r
, t
, size
, align
, bit_size
, bit_pos
, rc
, delayed_cast
;
2468 ft
= vtop
[-1].type
.t
;
2469 sbt
= vtop
->type
.t
& VT_BTYPE
;
2470 dbt
= ft
& VT_BTYPE
;
2471 if ((((sbt
== VT_INT
|| sbt
== VT_SHORT
) && dbt
== VT_BYTE
) ||
2472 (sbt
== VT_INT
&& dbt
== VT_SHORT
))
2473 && !(vtop
->type
.t
& VT_BITFIELD
)) {
2474 /* optimize char/short casts */
2475 delayed_cast
= VT_MUSTCAST
;
2476 vtop
->type
.t
= ft
& (VT_TYPE
& ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
)));
2477 /* XXX: factorize */
2478 if (ft
& VT_CONSTANT
)
2479 tcc_warning("assignment of read-only location");
2482 if (!(ft
& VT_BITFIELD
))
2483 gen_assign_cast(&vtop
[-1].type
);
2486 if (sbt
== VT_STRUCT
) {
2487 /* if structure, only generate pointer */
2488 /* structure assignment : generate memcpy */
2489 /* XXX: optimize if small size */
2490 if (!nocode_wanted
) {
2491 size
= type_size(&vtop
->type
, &align
);
2495 vtop
->type
.t
= VT_PTR
;
2498 /* address of memcpy() */
2501 vpush_global_sym(&func_old_type
, TOK_memcpy8
);
2502 else if(!(align
& 3))
2503 vpush_global_sym(&func_old_type
, TOK_memcpy4
);
2506 vpush_global_sym(&func_old_type
, TOK_memcpy
);
2511 vtop
->type
.t
= VT_PTR
;
2520 /* leave source on stack */
2521 } else if (ft
& VT_BITFIELD
) {
2522 /* bitfield store handling */
2523 bit_pos
= (ft
>> VT_STRUCT_SHIFT
) & 0x3f;
2524 bit_size
= (ft
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
2525 /* remove bit field info to avoid loops */
2526 vtop
[-1].type
.t
= ft
& ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
));
2528 /* duplicate source into other register */
2533 if((ft
& VT_BTYPE
) == VT_BOOL
) {
2534 gen_cast(&vtop
[-1].type
);
2535 vtop
[-1].type
.t
= (vtop
[-1].type
.t
& ~VT_BTYPE
) | (VT_BYTE
| VT_UNSIGNED
);
2538 /* duplicate destination */
2540 vtop
[-1] = vtop
[-2];
2542 /* mask and shift source */
2543 if((ft
& VT_BTYPE
) != VT_BOOL
) {
2544 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2545 vpushll((1ULL << bit_size
) - 1ULL);
2547 vpushi((1 << bit_size
) - 1);
2553 /* load destination, mask and or with source */
2555 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2556 vpushll(~(((1ULL << bit_size
) - 1ULL) << bit_pos
));
2558 vpushi(~(((1 << bit_size
) - 1) << bit_pos
));
2565 /* pop off shifted source from "duplicate source..." above */
2569 #ifdef CONFIG_TCC_BCHECK
2570 /* bound check case */
2571 if (vtop
[-1].r
& VT_MUSTBOUND
) {
2577 if (!nocode_wanted
) {
2581 #ifdef TCC_TARGET_X86_64
2582 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
2584 } else if ((ft
& VT_BTYPE
) == VT_QFLOAT
) {
2589 r
= gv(rc
); /* generate value */
2590 /* if lvalue was saved on stack, must read it */
2591 if ((vtop
[-1].r
& VT_VALMASK
) == VT_LLOCAL
) {
2593 t
= get_reg(RC_INT
);
2594 #ifdef TCC_TARGET_X86_64
2599 sv
.r
= VT_LOCAL
| VT_LVAL
;
2600 sv
.c
.ul
= vtop
[-1].c
.ul
;
2602 vtop
[-1].r
= t
| VT_LVAL
;
2604 /* two word case handling : store second register at word + 4 (or +8 for x86-64) */
2605 #ifdef TCC_TARGET_X86_64
2606 if (((ft
& VT_BTYPE
) == VT_QLONG
) || ((ft
& VT_BTYPE
) == VT_QFLOAT
)) {
2607 int addr_type
= VT_LLONG
, load_size
= 8, load_type
= ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) ? VT_LLONG
: VT_DOUBLE
;
2609 if ((ft
& VT_BTYPE
) == VT_LLONG
) {
2610 int addr_type
= VT_INT
, load_size
= 4, load_type
= VT_INT
;
2612 vtop
[-1].type
.t
= load_type
;
2615 /* convert to int to increment easily */
2616 vtop
->type
.t
= addr_type
;
2622 vtop
[-1].type
.t
= load_type
;
2623 /* XXX: it works because r2 is spilled last ! */
2624 store(vtop
->r2
, vtop
- 1);
2630 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
2631 vtop
->r
|= delayed_cast
;
2635 /* post defines POST/PRE add. c is the token ++ or -- */
2636 ST_FUNC
void inc(int post
, int c
)
2639 vdup(); /* save lvalue */
2641 gv_dup(); /* duplicate value */
2646 vpushi(c
- TOK_MID
);
2648 vstore(); /* store value */
2650 vpop(); /* if post op, return saved value */
2653 /* Parse GNUC __attribute__ extension. Currently, the following
2654 extensions are recognized:
2655 - aligned(n) : set data/function alignment.
2656 - packed : force data alignment to 1
2657 - section(x) : generate data/code in this section.
2658 - unused : currently ignored, but may be used someday.
2659 - regparm(n) : pass function parameters in registers (i386 only)
2661 static void parse_attribute(AttributeDef
*ad
)
2665 while (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
) {
2669 while (tok
!= ')') {
2670 if (tok
< TOK_IDENT
)
2671 expect("attribute name");
2679 expect("section name");
2680 ad
->section
= find_section(tcc_state
, (char *)tokc
.cstr
->data
);
2688 expect("alias(\"target\")");
2689 ad
->alias_target
= /* save string as token, for later */
2690 tok_alloc((char*)tokc
.cstr
->data
, tokc
.cstr
->size
-1)->tok
;
2694 case TOK_VISIBILITY1
:
2695 case TOK_VISIBILITY2
:
2698 expect("visibility(\"default|hidden|internal|protected\")");
2699 if (!strcmp (tokc
.cstr
->data
, "default"))
2700 ad
->a
.visibility
= STV_DEFAULT
;
2701 else if (!strcmp (tokc
.cstr
->data
, "hidden"))
2702 ad
->a
.visibility
= STV_HIDDEN
;
2703 else if (!strcmp (tokc
.cstr
->data
, "internal"))
2704 ad
->a
.visibility
= STV_INTERNAL
;
2705 else if (!strcmp (tokc
.cstr
->data
, "protected"))
2706 ad
->a
.visibility
= STV_PROTECTED
;
2708 expect("visibility(\"default|hidden|internal|protected\")");
2717 if (n
<= 0 || (n
& (n
- 1)) != 0)
2718 tcc_error("alignment must be a positive power of two");
2735 /* currently, no need to handle it because tcc does not
2736 track unused objects */
2740 /* currently, no need to handle it because tcc does not
2741 track unused objects */
2746 ad
->a
.func_call
= FUNC_CDECL
;
2751 ad
->a
.func_call
= FUNC_STDCALL
;
2753 #ifdef TCC_TARGET_I386
2763 ad
->a
.func_call
= FUNC_FASTCALL1
+ n
- 1;
2769 ad
->a
.func_call
= FUNC_FASTCALLW
;
2776 ad
->a
.mode
= VT_LLONG
+ 1;
2779 ad
->a
.mode
= VT_SHORT
+ 1;
2782 ad
->a
.mode
= VT_INT
+ 1;
2785 tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok
, NULL
));
2792 ad
->a
.func_export
= 1;
2795 ad
->a
.func_import
= 1;
2798 if (tcc_state
->warn_unsupported
)
2799 tcc_warning("'%s' attribute ignored", get_tok_str(t
, NULL
));
2800 /* skip parameters */
2802 int parenthesis
= 0;
2806 else if (tok
== ')')
2809 } while (parenthesis
&& tok
!= -1);
2822 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
2823 static void struct_decl(CType
*type
, int u
, int tdef
)
2825 int a
, v
, size
, align
, maxalign
, c
, offset
, flexible
;
2826 int bit_size
, bit_pos
, bsize
, bt
, lbit_pos
, prevbt
;
2827 Sym
*s
, *ss
, *ass
, **ps
;
2831 a
= tok
; /* save decl type */
2836 /* struct already defined ? return it */
2838 expect("struct/union/enum name");
2842 tcc_error("invalid type");
2844 } else if (tok
>= TOK_IDENT
&& !tdef
)
2845 tcc_error("unknown struct/union/enum");
2851 /* we put an undefined size for struct/union */
2852 s
= sym_push(v
| SYM_STRUCT
, &type1
, 0, -1);
2853 s
->r
= 0; /* default alignment is zero as gcc */
2854 /* put struct/union/enum name in type */
2862 tcc_error("struct/union/enum already defined");
2863 /* cannot be empty */
2865 /* non empty enums are not allowed */
2866 if (a
== TOK_ENUM
) {
2870 expect("identifier");
2872 if (ss
&& !local_stack
)
2873 tcc_error("redefinition of enumerator '%s'",
2874 get_tok_str(v
, NULL
));
2880 /* enum symbols have static storage */
2881 ss
= sym_push(v
, &int_type
, VT_CONST
, c
);
2882 ss
->type
.t
|= VT_STATIC
;
2887 /* NOTE: we accept a trailing comma */
2891 s
->c
= type_size(&int_type
, &align
);
2900 while (tok
!= '}') {
2901 parse_btype(&btype
, &ad
);
2904 tcc_error("flexible array member '%s' not at the end of struct",
2905 get_tok_str(v
, NULL
));
2910 type_decl(&type1
, &ad
, &v
, TYPE_DIRECT
| TYPE_ABSTRACT
);
2911 if (v
== 0 && (type1
.t
& VT_BTYPE
) != VT_STRUCT
)
2912 expect("identifier");
2913 if (type_size(&type1
, &align
) < 0) {
2914 if ((a
== TOK_STRUCT
) && (type1
.t
& VT_ARRAY
) && c
)
2917 tcc_error("field '%s' has incomplete type",
2918 get_tok_str(v
, NULL
));
2920 if ((type1
.t
& VT_BTYPE
) == VT_FUNC
||
2921 (type1
.t
& (VT_TYPEDEF
| VT_STATIC
| VT_EXTERN
| VT_INLINE
)))
2922 tcc_error("invalid type for '%s'",
2923 get_tok_str(v
, NULL
));
2927 bit_size
= expr_const();
2928 /* XXX: handle v = 0 case for messages */
2930 tcc_error("negative width in bit-field '%s'",
2931 get_tok_str(v
, NULL
));
2932 if (v
&& bit_size
== 0)
2933 tcc_error("zero width for bit-field '%s'",
2934 get_tok_str(v
, NULL
));
2936 size
= type_size(&type1
, &align
);
2938 if (align
< ad
.a
.aligned
)
2939 align
= ad
.a
.aligned
;
2940 } else if (ad
.a
.packed
) {
2942 } else if (*tcc_state
->pack_stack_ptr
) {
2943 if (align
> *tcc_state
->pack_stack_ptr
)
2944 align
= *tcc_state
->pack_stack_ptr
;
2947 if (bit_size
>= 0) {
2948 bt
= type1
.t
& VT_BTYPE
;
2955 tcc_error("bitfields must have scalar type");
2957 if (bit_size
> bsize
) {
2958 tcc_error("width of '%s' exceeds its type",
2959 get_tok_str(v
, NULL
));
2960 } else if (bit_size
== bsize
) {
2961 /* no need for bit fields */
2963 } else if (bit_size
== 0) {
2964 /* XXX: what to do if only padding in a
2966 /* zero size: means to pad */
2969 /* we do not have enough room ?
2970 did the type change?
2972 if ((bit_pos
+ bit_size
) > bsize
||
2973 bt
!= prevbt
|| a
== TOK_UNION
)
2976 /* XXX: handle LSB first */
2977 type1
.t
|= VT_BITFIELD
|
2978 (bit_pos
<< VT_STRUCT_SHIFT
) |
2979 (bit_size
<< (VT_STRUCT_SHIFT
+ 6));
2980 bit_pos
+= bit_size
;
2986 if (v
!= 0 || (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
2987 /* add new memory data only if starting
2989 if (lbit_pos
== 0) {
2990 if (a
== TOK_STRUCT
) {
2991 c
= (c
+ align
- 1) & -align
;
3000 if (align
> maxalign
)
3004 printf("add field %s offset=%d",
3005 get_tok_str(v
, NULL
), offset
);
3006 if (type1
.t
& VT_BITFIELD
) {
3007 printf(" pos=%d size=%d",
3008 (type1
.t
>> VT_STRUCT_SHIFT
) & 0x3f,
3009 (type1
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f);
3014 if (v
== 0 && (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
3016 while ((ass
= ass
->next
) != NULL
) {
3017 ss
= sym_push(ass
->v
, &ass
->type
, 0, offset
+ ass
->c
);
3022 ss
= sym_push(v
| SYM_FIELD
, &type1
, 0, offset
);
3026 if (tok
== ';' || tok
== TOK_EOF
)
3033 /* store size and alignment */
3034 s
->c
= (c
+ maxalign
- 1) & -maxalign
;
3040 /* return 1 if basic type is a type size (short, long, long long) */
3041 ST_FUNC
int is_btype_size(int bt
)
3043 return bt
== VT_SHORT
|| bt
== VT_LONG
|| bt
== VT_LLONG
;
3046 /* return 0 if no type declaration. otherwise, return the basic type
3049 static int parse_btype(CType
*type
, AttributeDef
*ad
)
3051 int t
, u
, bt_size
, complete
, type_found
, typespec_found
;
3055 memset(ad
, 0, sizeof(AttributeDef
));
3063 /* currently, we really ignore extension */
3074 tcc_error("too many basic types");
3076 bt_size
= is_btype_size (u
& VT_BTYPE
);
3077 if (u
== VT_INT
|| (!bt_size
&& !(t
& VT_TYPEDEF
)))
3092 if ((t
& VT_BTYPE
) == VT_DOUBLE
) {
3093 #ifndef TCC_TARGET_PE
3094 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3096 } else if ((t
& VT_BTYPE
) == VT_LONG
) {
3097 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3111 if ((t
& VT_BTYPE
) == VT_LONG
) {
3112 #ifdef TCC_TARGET_PE
3113 t
= (t
& ~VT_BTYPE
) | VT_DOUBLE
;
3115 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3123 struct_decl(&type1
, VT_ENUM
, t
& VT_TYPEDEF
);
3126 type
->ref
= type1
.ref
;
3130 struct_decl(&type1
, VT_STRUCT
, t
& VT_TYPEDEF
);
3133 /* type modifiers */
3149 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == (VT_DEFSIGN
|VT_UNSIGNED
))
3150 tcc_error("signed and unsigned modifier");
3163 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == VT_DEFSIGN
)
3164 tcc_error("signed and unsigned modifier");
3165 t
|= VT_DEFSIGN
| VT_UNSIGNED
;
3190 /* GNUC attribute */
3191 case TOK_ATTRIBUTE1
:
3192 case TOK_ATTRIBUTE2
:
3193 parse_attribute(ad
);
3196 t
= (t
& ~VT_BTYPE
) | u
;
3204 parse_expr_type(&type1
);
3205 /* remove all storage modifiers except typedef */
3206 type1
.t
&= ~(VT_STORAGE
&~VT_TYPEDEF
);
3212 if (!s
|| !(s
->type
.t
& VT_TYPEDEF
))
3214 t
|= (s
->type
.t
& ~VT_TYPEDEF
);
3215 type
->ref
= s
->type
.ref
;
3217 /* get attributes from typedef */
3218 if (0 == ad
->a
.aligned
)
3219 ad
->a
.aligned
= s
->a
.aligned
;
3220 if (0 == ad
->a
.func_call
)
3221 ad
->a
.func_call
= s
->a
.func_call
;
3222 ad
->a
.packed
|= s
->a
.packed
;
3231 if (tcc_state
->char_is_unsigned
) {
3232 if ((t
& (VT_DEFSIGN
|VT_BTYPE
)) == VT_BYTE
)
3236 /* long is never used as type */
3237 if ((t
& VT_BTYPE
) == VT_LONG
)
3238 #if !defined TCC_TARGET_X86_64 || defined TCC_TARGET_PE
3239 t
= (t
& ~VT_BTYPE
) | VT_INT
;
3241 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3247 /* convert a function parameter type (array to pointer and function to
3248 function pointer) */
3249 static inline void convert_parameter_type(CType
*pt
)
3251 /* remove const and volatile qualifiers (XXX: const could be used
3252 to indicate a const function parameter */
3253 pt
->t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3254 /* array must be transformed to pointer according to ANSI C */
3256 if ((pt
->t
& VT_BTYPE
) == VT_FUNC
) {
3261 ST_FUNC
void parse_asm_str(CString
*astr
)
3264 /* read the string */
3266 expect("string constant");
3268 while (tok
== TOK_STR
) {
3269 /* XXX: add \0 handling too ? */
3270 cstr_cat(astr
, tokc
.cstr
->data
);
3273 cstr_ccat(astr
, '\0');
3276 /* Parse an asm label and return the label
3277 * Don't forget to free the CString in the caller! */
3278 static void asm_label_instr(CString
*astr
)
3281 parse_asm_str(astr
);
3284 printf("asm_alias: \"%s\"\n", (char *)astr
->data
);
3288 static void post_type(CType
*type
, AttributeDef
*ad
)
3290 int n
, l
, t1
, arg_size
, align
;
3291 Sym
**plast
, *s
, *first
;
3296 /* function declaration */
3304 /* read param name and compute offset */
3305 if (l
!= FUNC_OLD
) {
3306 if (!parse_btype(&pt
, &ad1
)) {
3308 tcc_error("invalid type");
3315 if ((pt
.t
& VT_BTYPE
) == VT_VOID
&& tok
== ')')
3317 type_decl(&pt
, &ad1
, &n
, TYPE_DIRECT
| TYPE_ABSTRACT
);
3318 if ((pt
.t
& VT_BTYPE
) == VT_VOID
)
3319 tcc_error("parameter declared as void");
3320 arg_size
+= (type_size(&pt
, &align
) + PTR_SIZE
- 1) / PTR_SIZE
;
3325 expect("identifier");
3329 convert_parameter_type(&pt
);
3330 s
= sym_push(n
| SYM_FIELD
, &pt
, 0, 0);
3336 if (l
== FUNC_NEW
&& tok
== TOK_DOTS
) {
3343 /* if no parameters, then old type prototype */
3347 /* NOTE: const is ignored in returned type as it has a special
3348 meaning in gcc / C++ */
3349 type
->t
&= ~VT_CONSTANT
;
3350 /* some ancient pre-K&R C allows a function to return an array
3351 and the array brackets to be put after the arguments, such
3352 that "int c()[]" means something like "int[] c()" */
3355 skip(']'); /* only handle simple "[]" */
3358 /* we push a anonymous symbol which will contain the function prototype */
3359 ad
->a
.func_args
= arg_size
;
3360 s
= sym_push(SYM_FIELD
, type
, 0, l
);
3365 } else if (tok
== '[') {
3366 /* array definition */
3368 if (tok
== TOK_RESTRICT1
)
3373 if (!local_stack
|| nocode_wanted
)
3374 vpushi(expr_const());
3376 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3379 tcc_error("invalid array size");
3381 if (!is_integer_btype(vtop
->type
.t
& VT_BTYPE
))
3382 tcc_error("size of variable length array should be an integer");
3387 /* parse next post type */
3388 post_type(type
, ad
);
3389 if (type
->t
== VT_FUNC
)
3390 tcc_error("declaration of an array of functions");
3391 t1
|= type
->t
& VT_VLA
;
3394 loc
-= type_size(&int_type
, &align
);
3398 vla_runtime_type_size(type
, &align
);
3400 vset(&int_type
, VT_LOCAL
|VT_LVAL
, loc
);
3407 /* we push an anonymous symbol which will contain the array
3409 s
= sym_push(SYM_FIELD
, type
, 0, n
);
3410 type
->t
= (t1
? VT_VLA
: VT_ARRAY
) | VT_PTR
;
3415 /* Parse a type declaration (except basic type), and return the type
3416 in 'type'. 'td' is a bitmask indicating which kind of type decl is
3417 expected. 'type' should contain the basic type. 'ad' is the
3418 attribute definition of the basic type. It can be modified by
3421 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
)
3424 CType type1
, *type2
;
3425 int qualifiers
, storage
;
3427 while (tok
== '*') {
3435 qualifiers
|= VT_CONSTANT
;
3440 qualifiers
|= VT_VOLATILE
;
3448 type
->t
|= qualifiers
;
3451 /* XXX: clarify attribute handling */
3452 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3453 parse_attribute(ad
);
3455 /* recursive type */
3456 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
3457 type1
.t
= 0; /* XXX: same as int */
3460 /* XXX: this is not correct to modify 'ad' at this point, but
3461 the syntax is not clear */
3462 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3463 parse_attribute(ad
);
3464 type_decl(&type1
, ad
, v
, td
);
3467 /* type identifier */
3468 if (tok
>= TOK_IDENT
&& (td
& TYPE_DIRECT
)) {
3472 if (!(td
& TYPE_ABSTRACT
))
3473 expect("identifier");
3477 storage
= type
->t
& VT_STORAGE
;
3478 type
->t
&= ~VT_STORAGE
;
3479 if (storage
& VT_STATIC
) {
3480 int saved_nocode_wanted
= nocode_wanted
;
3482 post_type(type
, ad
);
3483 nocode_wanted
= saved_nocode_wanted
;
3485 post_type(type
, ad
);
3487 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3488 parse_attribute(ad
);
3492 /* append type at the end of type1 */
3505 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
3506 ST_FUNC
int lvalue_type(int t
)
3511 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
3513 else if (bt
== VT_SHORT
)
3517 if (t
& VT_UNSIGNED
)
3518 r
|= VT_LVAL_UNSIGNED
;
3522 /* indirection with full error checking and bound check */
3523 ST_FUNC
void indir(void)
3525 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
) {
3526 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FUNC
)
3530 if ((vtop
->r
& VT_LVAL
) && !nocode_wanted
)
3532 vtop
->type
= *pointed_type(&vtop
->type
);
3533 /* Arrays and functions are never lvalues */
3534 if (!(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_VLA
)
3535 && (vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
3536 vtop
->r
|= lvalue_type(vtop
->type
.t
);
3537 /* if bound checking, the referenced pointer must be checked */
3538 #ifdef CONFIG_TCC_BCHECK
3539 if (tcc_state
->do_bounds_check
)
3540 vtop
->r
|= VT_MUSTBOUND
;
3545 /* pass a parameter to a function and do type checking and casting */
3546 static void gfunc_param_typed(Sym
*func
, Sym
*arg
)
3551 func_type
= func
->c
;
3552 if (func_type
== FUNC_OLD
||
3553 (func_type
== FUNC_ELLIPSIS
&& arg
== NULL
)) {
3554 /* default casting : only need to convert float to double */
3555 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
) {
3558 } else if (vtop
->type
.t
& VT_BITFIELD
) {
3559 type
.t
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
3562 } else if (arg
== NULL
) {
3563 tcc_error("too many arguments to function");
3566 type
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
3567 gen_assign_cast(&type
);
3571 /* parse an expression of the form '(type)' or '(expr)' and return its
3573 static void parse_expr_type(CType
*type
)
3579 if (parse_btype(type
, &ad
)) {
3580 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3587 static void parse_type(CType
*type
)
3592 if (!parse_btype(type
, &ad
)) {
3595 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3598 static void vpush_tokc(int t
)
3603 vsetc(&type
, VT_CONST
, &tokc
);
3606 ST_FUNC
void unary(void)
3608 int n
, t
, align
, size
, r
, sizeof_caller
;
3612 static int in_sizeof
= 0;
3614 sizeof_caller
= in_sizeof
;
3616 /* XXX: GCC 2.95.3 does not generate a table although it should be
3630 vpush_tokc(VT_INT
| VT_UNSIGNED
);
3634 vpush_tokc(VT_LLONG
);
3638 vpush_tokc(VT_LLONG
| VT_UNSIGNED
);
3642 vpush_tokc(VT_FLOAT
);
3646 vpush_tokc(VT_DOUBLE
);
3650 vpush_tokc(VT_LDOUBLE
);
3653 case TOK___FUNCTION__
:
3655 goto tok_identifier
;
3661 /* special function name identifier */
3662 len
= strlen(funcname
) + 1;
3663 /* generate char[len] type */
3668 vpush_ref(&type
, data_section
, data_section
->data_offset
, len
);
3669 ptr
= section_ptr_add(data_section
, len
);
3670 memcpy(ptr
, funcname
, len
);
3675 #ifdef TCC_TARGET_PE
3676 t
= VT_SHORT
| VT_UNSIGNED
;
3682 /* string parsing */
3685 if (tcc_state
->warn_write_strings
)
3690 memset(&ad
, 0, sizeof(AttributeDef
));
3691 decl_initializer_alloc(&type
, &ad
, VT_CONST
, 2, 0, NULL
, 0);
3696 if (parse_btype(&type
, &ad
)) {
3697 type_decl(&type
, &ad
, &n
, TYPE_ABSTRACT
);
3699 /* check ISOC99 compound literal */
3701 /* data is allocated locally by default */
3706 /* all except arrays are lvalues */
3707 if (!(type
.t
& VT_ARRAY
))
3708 r
|= lvalue_type(type
.t
);
3709 memset(&ad
, 0, sizeof(AttributeDef
));
3710 decl_initializer_alloc(&type
, &ad
, r
, 1, 0, NULL
, 0);
3712 if (sizeof_caller
) {
3719 } else if (tok
== '{') {
3720 /* save all registers */
3722 /* statement expression : we do not accept break/continue
3723 inside as GCC does */
3724 block(NULL
, NULL
, NULL
, NULL
, 0, 1);
3739 /* functions names must be treated as function pointers,
3740 except for unary '&' and sizeof. Since we consider that
3741 functions are not lvalues, we only have to handle it
3742 there and in function calls. */
3743 /* arrays can also be used although they are not lvalues */
3744 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
&&
3745 !(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_LLOCAL
))
3747 mk_pointer(&vtop
->type
);
3753 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3755 boolean
.t
= VT_BOOL
;
3757 vtop
->c
.i
= !vtop
->c
.i
;
3758 } else if ((vtop
->r
& VT_VALMASK
) == VT_CMP
)
3759 vtop
->c
.i
= vtop
->c
.i
^ 1;
3762 vseti(VT_JMP
, gvtst(1, 0));
3774 if ((vtop
->type
.t
& VT_BTYPE
) == VT_PTR
)
3775 tcc_error("pointer not accepted for unary plus");
3776 /* In order to force cast, we add zero, except for floating point
3777 where we really need an noop (otherwise -0.0 will be transformed
3779 if (!is_float(vtop
->type
.t
)) {
3790 unary_type(&type
); // Perform a in_sizeof = 0;
3791 size
= type_size(&type
, &align
);
3792 if (t
== TOK_SIZEOF
) {
3793 if (!(type
.t
& VT_VLA
)) {
3795 tcc_error("sizeof applied to an incomplete type");
3798 vla_runtime_type_size(&type
, &align
);
3803 vtop
->type
.t
|= VT_UNSIGNED
;
3806 case TOK_builtin_types_compatible_p
:
3815 type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3816 type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3817 vpushi(is_compatible_types(&type1
, &type2
));
3820 case TOK_builtin_constant_p
:
3822 int saved_nocode_wanted
, res
;
3825 saved_nocode_wanted
= nocode_wanted
;
3828 res
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
3830 nocode_wanted
= saved_nocode_wanted
;
3835 case TOK_builtin_frame_address
:
3841 if (tok
!= TOK_CINT
|| tokc
.i
< 0) {
3842 tcc_error("__builtin_frame_address only takes positive integers");
3849 vset(&type
, VT_LOCAL
, 0); /* local frame */
3851 mk_pointer(&vtop
->type
);
3852 indir(); /* -> parent frame */
3856 #ifdef TCC_TARGET_X86_64
3857 #ifdef TCC_TARGET_PE
3858 case TOK_builtin_va_start
:
3866 if ((vtop
->r
& VT_VALMASK
) != VT_LOCAL
)
3867 tcc_error("__builtin_va_start expects a local variable");
3868 vtop
->r
&= ~(VT_LVAL
| VT_REF
);
3869 vtop
->type
= char_pointer_type
;
3874 case TOK_builtin_va_arg_types
:
3881 vpushi(classify_x86_64_va_arg(&type
));
3896 t
= vtop
->type
.t
& VT_BTYPE
;
3898 /* In IEEE negate(x) isn't subtract(0,x), but rather
3903 else if (t
== VT_DOUBLE
)
3914 goto tok_identifier
;
3916 /* allow to take the address of a label */
3917 if (tok
< TOK_UIDENT
)
3918 expect("label identifier");
3919 s
= label_find(tok
);
3921 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
3923 if (s
->r
== LABEL_DECLARED
)
3924 s
->r
= LABEL_FORWARD
;
3927 s
->type
.t
= VT_VOID
;
3928 mk_pointer(&s
->type
);
3929 s
->type
.t
|= VT_STATIC
;
3931 vpushsym(&s
->type
, s
);
3935 // special qnan , snan and infinity values
3937 vpush64(VT_DOUBLE
, 0x7ff8000000000000ULL
);
3941 vpush64(VT_DOUBLE
, 0x7ff0000000000001ULL
);
3945 vpush64(VT_DOUBLE
, 0x7ff0000000000000ULL
);
3954 expect("identifier");
3957 const char *name
= get_tok_str(t
, NULL
);
3959 tcc_error("'%s' undeclared", name
);
3960 /* for simple function calls, we tolerate undeclared
3961 external reference to int() function */
3962 if (tcc_state
->warn_implicit_function_declaration
3963 #ifdef TCC_TARGET_PE
3964 /* people must be warned about using undeclared WINAPI functions
3965 (which usually start with uppercase letter) */
3966 || (name
[0] >= 'A' && name
[0] <= 'Z')
3969 tcc_warning("implicit declaration of function '%s'", name
);
3970 s
= external_global_sym(t
, &func_old_type
, 0);
3972 if ((s
->type
.t
& (VT_STATIC
| VT_INLINE
| VT_BTYPE
)) ==
3973 (VT_STATIC
| VT_INLINE
| VT_FUNC
)) {
3974 /* if referencing an inline function, then we generate a
3975 symbol to it if not already done. It will have the
3976 effect to generate code for it at the end of the
3977 compilation unit. Inline function as always
3978 generated in the text section. */
3980 put_extern_sym(s
, text_section
, 0, 0);
3981 r
= VT_SYM
| VT_CONST
;
3985 vset(&s
->type
, r
, s
->c
);
3986 /* if forward reference, we must point to s */
3987 if (vtop
->r
& VT_SYM
) {
3989 vtop
->c
.ptr_offset
= 0;
3994 /* post operations */
3996 if (tok
== TOK_INC
|| tok
== TOK_DEC
) {
3999 } else if (tok
== '.' || tok
== TOK_ARROW
) {
4002 if (tok
== TOK_ARROW
)
4004 qualifiers
= vtop
->type
.t
& (VT_CONSTANT
| VT_VOLATILE
);
4008 /* expect pointer on structure */
4009 if ((vtop
->type
.t
& VT_BTYPE
) != VT_STRUCT
)
4010 expect("struct or union");
4014 while ((s
= s
->next
) != NULL
) {
4019 tcc_error("field not found: %s", get_tok_str(tok
& ~SYM_FIELD
, NULL
));
4020 /* add field offset to pointer */
4021 vtop
->type
= char_pointer_type
; /* change type to 'char *' */
4024 /* change type to field type, and set to lvalue */
4025 vtop
->type
= s
->type
;
4026 vtop
->type
.t
|= qualifiers
;
4027 /* an array is never an lvalue */
4028 if (!(vtop
->type
.t
& VT_ARRAY
)) {
4029 vtop
->r
|= lvalue_type(vtop
->type
.t
);
4030 #ifdef CONFIG_TCC_BCHECK
4031 /* if bound checking, the referenced pointer must be checked */
4032 if (tcc_state
->do_bounds_check
)
4033 vtop
->r
|= VT_MUSTBOUND
;
4037 } else if (tok
== '[') {
4043 } else if (tok
== '(') {
4046 int nb_args
, ret_nregs
, ret_align
, variadic
;
4049 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
4050 /* pointer test (no array accepted) */
4051 if ((vtop
->type
.t
& (VT_BTYPE
| VT_ARRAY
)) == VT_PTR
) {
4052 vtop
->type
= *pointed_type(&vtop
->type
);
4053 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
)
4057 expect("function pointer");
4060 vtop
->r
&= ~VT_LVAL
; /* no lvalue */
4062 /* get return type */
4065 sa
= s
->next
; /* first parameter */
4068 /* compute first implicit argument if a structure is returned */
4069 if ((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
4070 variadic
= (s
->c
== FUNC_ELLIPSIS
);
4071 ret_nregs
= gfunc_sret(&s
->type
, variadic
, &ret
.type
,
4074 /* get some space for the returned structure */
4075 size
= type_size(&s
->type
, &align
);
4076 loc
= (loc
- size
) & -align
;
4078 ret
.r
= VT_LOCAL
| VT_LVAL
;
4079 /* pass it as 'int' to avoid structure arg passing
4081 vseti(VT_LOCAL
, loc
);
4091 /* return in register */
4092 if (is_float(ret
.type
.t
)) {
4093 ret
.r
= reg_fret(ret
.type
.t
);
4094 #ifdef TCC_TARGET_X86_64
4095 if ((ret
.type
.t
& VT_BTYPE
) == VT_QFLOAT
)
4099 #ifdef TCC_TARGET_X86_64
4100 if ((ret
.type
.t
& VT_BTYPE
) == VT_QLONG
)
4102 if ((ret
.type
.t
& VT_BTYPE
) == VT_LLONG
)
4112 gfunc_param_typed(s
, sa
);
4122 tcc_error("too few arguments to function");
4124 if (!nocode_wanted
) {
4125 gfunc_call(nb_args
);
4127 vtop
-= (nb_args
+ 1);
4131 for (r
= ret
.r
+ ret_nregs
+ !ret_nregs
; r
-- > ret
.r
;) {
4132 vsetc(&ret
.type
, r
, &ret
.c
);
4133 vtop
->r2
= ret
.r2
; /* Loop only happens when r2 is VT_CONST */
4136 /* handle packed struct return */
4137 if (((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) && ret_nregs
) {
4140 size
= type_size(&s
->type
, &align
);
4141 loc
= (loc
- size
) & -align
;
4145 vset(&ret
.type
, VT_LOCAL
| VT_LVAL
, addr
+ offset
);
4149 if (--ret_nregs
== 0)
4151 /* XXX: compatible with arm only: ret_align == register_size */
4152 offset
+= ret_align
;
4154 vset(&s
->type
, VT_LOCAL
| VT_LVAL
, addr
);
4162 ST_FUNC
void expr_prod(void)
4167 while (tok
== '*' || tok
== '/' || tok
== '%') {
4175 ST_FUNC
void expr_sum(void)
4180 while (tok
== '+' || tok
== '-') {
4188 static void expr_shift(void)
4193 while (tok
== TOK_SHL
|| tok
== TOK_SAR
) {
4201 static void expr_cmp(void)
4206 while ((tok
>= TOK_ULE
&& tok
<= TOK_GT
) ||
4207 tok
== TOK_ULT
|| tok
== TOK_UGE
) {
4215 static void expr_cmpeq(void)
4220 while (tok
== TOK_EQ
|| tok
== TOK_NE
) {
4228 static void expr_and(void)
4231 while (tok
== '&') {
4238 static void expr_xor(void)
4241 while (tok
== '^') {
4248 static void expr_or(void)
4251 while (tok
== '|') {
4258 /* XXX: fix this mess */
4259 static void expr_land_const(void)
4262 while (tok
== TOK_LAND
) {
4269 /* XXX: fix this mess */
4270 static void expr_lor_const(void)
4273 while (tok
== TOK_LOR
) {
4280 /* only used if non constant */
4281 static void expr_land(void)
4286 if (tok
== TOK_LAND
) {
4291 if (tok
!= TOK_LAND
) {
4301 static void expr_lor(void)
4306 if (tok
== TOK_LOR
) {
4311 if (tok
!= TOK_LOR
) {
4321 /* XXX: better constant handling */
4322 static void expr_cond(void)
4324 int tt
, u
, r1
, r2
, rc
, t1
, t2
, bt1
, bt2
;
4326 CType type
, type1
, type2
;
4333 boolean
.t
= VT_BOOL
;
4339 if (tok
!= ':' || !gnu_ext
) {
4354 if (vtop
!= vstack
) {
4355 /* needed to avoid having different registers saved in
4357 if (is_float(vtop
->type
.t
)) {
4359 #ifdef TCC_TARGET_X86_64
4360 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4370 if (tok
== ':' && gnu_ext
) {
4378 sv
= *vtop
; /* save value to handle it later */
4379 vtop
--; /* no vpop so that FP stack is not flushed */
4387 bt1
= t1
& VT_BTYPE
;
4389 bt2
= t2
& VT_BTYPE
;
4390 /* cast operands to correct type according to ISOC rules */
4391 if (is_float(bt1
) || is_float(bt2
)) {
4392 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
4393 type
.t
= VT_LDOUBLE
;
4394 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
4399 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
4400 /* cast to biggest op */
4402 /* convert to unsigned if it does not fit in a long long */
4403 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
4404 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
4405 type
.t
|= VT_UNSIGNED
;
4406 } else if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
4407 /* If one is a null ptr constant the result type
4409 if (is_null_pointer (vtop
))
4411 else if (is_null_pointer (&sv
))
4413 /* XXX: test pointer compatibility, C99 has more elaborate
4417 } else if (bt1
== VT_FUNC
|| bt2
== VT_FUNC
) {
4418 /* XXX: test function pointer compatibility */
4419 type
= bt1
== VT_FUNC
? type1
: type2
;
4420 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
4421 /* XXX: test structure compatibility */
4422 type
= bt1
== VT_STRUCT
? type1
: type2
;
4423 } else if (bt1
== VT_VOID
|| bt2
== VT_VOID
) {
4424 /* NOTE: as an extension, we accept void on only one side */
4427 /* integer operations */
4429 /* convert to unsigned if it does not fit in an integer */
4430 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
4431 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
4432 type
.t
|= VT_UNSIGNED
;
4435 /* now we convert second operand */
4437 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4440 if (is_float(type
.t
)) {
4442 #ifdef TCC_TARGET_X86_64
4443 if ((type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4447 } else if ((type
.t
& VT_BTYPE
) == VT_LLONG
) {
4448 /* for long longs, we use fixed registers to avoid having
4449 to handle a complicated move */
4454 /* this is horrible, but we must also convert first
4458 /* put again first value and cast it */
4461 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4464 move_reg(r2
, r1
, type
.t
);
4471 static void expr_eq(void)
4477 (tok
>= TOK_A_MOD
&& tok
<= TOK_A_DIV
) ||
4478 tok
== TOK_A_XOR
|| tok
== TOK_A_OR
||
4479 tok
== TOK_A_SHL
|| tok
== TOK_A_SAR
) {
4494 ST_FUNC
void gexpr(void)
4505 /* parse an expression and return its type without any side effect. */
4506 static void expr_type(CType
*type
)
4508 int saved_nocode_wanted
;
4510 saved_nocode_wanted
= nocode_wanted
;
4515 nocode_wanted
= saved_nocode_wanted
;
4518 /* parse a unary expression and return its type without any side
4520 static void unary_type(CType
*type
)
4532 /* parse a constant expression and return value in vtop. */
4533 static void expr_const1(void)
4542 /* parse an integer constant and return its value. */
4543 ST_FUNC
int expr_const(void)
4547 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
4548 expect("constant expression");
4554 /* return the label token if current token is a label, otherwise
4556 static int is_label(void)
4560 /* fast test first */
4561 if (tok
< TOK_UIDENT
)
4563 /* no need to save tokc because tok is an identifier */
4570 unget_tok(last_tok
);
4575 static void label_or_decl(int l
)
4579 /* fast test first */
4580 if (tok
>= TOK_UIDENT
)
4582 /* no need to save tokc because tok is an identifier */
4586 unget_tok(last_tok
);
4589 unget_tok(last_tok
);
4594 static void block(int *bsym
, int *csym
, int *case_sym
, int *def_sym
,
4595 int case_reg
, int is_expr
)
4598 Sym
*s
, *frame_bottom
;
4600 /* generate line number info */
4601 if (tcc_state
->do_debug
&&
4602 (last_line_num
!= file
->line_num
|| last_ind
!= ind
)) {
4603 put_stabn(N_SLINE
, 0, file
->line_num
, ind
- func_ind
);
4605 last_line_num
= file
->line_num
;
4609 /* default return value is (void) */
4611 vtop
->type
.t
= VT_VOID
;
4614 if (tok
== TOK_IF
) {
4621 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4623 if (c
== TOK_ELSE
) {
4627 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4628 gsym(d
); /* patch else jmp */
4631 } else if (tok
== TOK_WHILE
) {
4639 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4643 } else if (tok
== '{') {
4645 int block_vla_sp_loc
, *saved_vla_sp_loc
, saved_vla_flags
;
4648 /* record local declaration stack position */
4650 frame_bottom
= sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
4651 frame_bottom
->next
= scope_stack_bottom
;
4652 scope_stack_bottom
= frame_bottom
;
4653 llabel
= local_label_stack
;
4655 /* save VLA state */
4656 block_vla_sp_loc
= *(saved_vla_sp_loc
= vla_sp_loc
);
4657 if (saved_vla_sp_loc
!= &vla_sp_root_loc
)
4658 vla_sp_loc
= &block_vla_sp_loc
;
4660 saved_vla_flags
= vla_flags
;
4661 vla_flags
|= VLA_NEED_NEW_FRAME
;
4663 /* handle local labels declarations */
4664 if (tok
== TOK_LABEL
) {
4667 if (tok
< TOK_UIDENT
)
4668 expect("label identifier");
4669 label_push(&local_label_stack
, tok
, LABEL_DECLARED
);
4679 while (tok
!= '}') {
4680 label_or_decl(VT_LOCAL
);
4684 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
4687 /* pop locally defined labels */
4688 label_pop(&local_label_stack
, llabel
);
4690 /* XXX: this solution makes only valgrind happy...
4691 triggered by gcc.c-torture/execute/20000917-1.c */
4693 switch(vtop
->type
.t
& VT_BTYPE
) {
4698 for(p
=vtop
->type
.ref
;p
;p
=p
->prev
)
4700 tcc_error("unsupported expression type");
4703 /* pop locally defined symbols */
4704 scope_stack_bottom
= scope_stack_bottom
->next
;
4705 sym_pop(&local_stack
, s
);
4707 /* Pop VLA frames and restore stack pointer if required */
4708 if (saved_vla_sp_loc
!= &vla_sp_root_loc
)
4709 *saved_vla_sp_loc
= block_vla_sp_loc
;
4710 if (vla_sp_loc
!= (saved_vla_sp_loc
== &vla_sp_root_loc
? &vla_sp_root_loc
: &block_vla_sp_loc
)) {
4711 vla_sp_loc
= saved_vla_sp_loc
;
4712 gen_vla_sp_restore(*vla_sp_loc
);
4714 vla_flags
= (vla_flags
& ~VLA_SCOPE_FLAGS
) | (saved_vla_flags
& VLA_SCOPE_FLAGS
);
4717 } else if (tok
== TOK_RETURN
) {
4721 gen_assign_cast(&func_vt
);
4722 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
4723 CType type
, ret_type
;
4724 int ret_align
, ret_nregs
;
4725 ret_nregs
= gfunc_sret(&func_vt
, func_var
, &ret_type
,
4727 if (0 == ret_nregs
) {
4728 /* if returning structure, must copy it to implicit
4729 first pointer arg location */
4732 vset(&type
, VT_LOCAL
| VT_LVAL
, func_vc
);
4735 /* copy structure value to pointer */
4738 /* returning structure packed into registers */
4739 int r
, size
, addr
, align
;
4740 size
= type_size(&func_vt
,&align
);
4741 if ((vtop
->r
!= (VT_LOCAL
| VT_LVAL
) || (vtop
->c
.i
& (ret_align
-1)))
4742 && (align
& (ret_align
-1))) {
4743 loc
= (loc
- size
) & -align
;
4746 vset(&type
, VT_LOCAL
| VT_LVAL
, addr
);
4749 vset(&ret_type
, VT_LOCAL
| VT_LVAL
, addr
);
4751 vtop
->type
= ret_type
;
4752 if (is_float(ret_type
.t
))
4753 r
= rc_fret(ret_type
.t
);
4759 if (--ret_nregs
== 0)
4761 /* We assume that when a structure is returned in multiple
4762 registers, their classes are consecutive values of the
4765 /* XXX: compatible with arm only: ret_align == register_size */
4766 vtop
->c
.i
+= ret_align
;
4767 vtop
->r
= VT_LOCAL
| VT_LVAL
;
4770 } else if (is_float(func_vt
.t
)) {
4771 gv(rc_fret(func_vt
.t
));
4775 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
4778 rsym
= gjmp(rsym
); /* jmp */
4779 } else if (tok
== TOK_BREAK
) {
4782 tcc_error("cannot break");
4783 *bsym
= gjmp(*bsym
);
4786 } else if (tok
== TOK_CONTINUE
) {
4789 tcc_error("cannot continue");
4790 *csym
= gjmp(*csym
);
4793 } else if (tok
== TOK_FOR
) {
4798 frame_bottom
= sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
4799 frame_bottom
->next
= scope_stack_bottom
;
4800 scope_stack_bottom
= frame_bottom
;
4802 /* c99 for-loop init decl? */
4803 if (!decl0(VT_LOCAL
, 1)) {
4804 /* no, regular for-loop init expr */
4828 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4832 scope_stack_bottom
= scope_stack_bottom
->next
;
4833 sym_pop(&local_stack
, s
);
4835 if (tok
== TOK_DO
) {
4840 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4851 if (tok
== TOK_SWITCH
) {
4855 /* XXX: other types than integer */
4856 case_reg
= gv(RC_INT
);
4860 b
= gjmp(0); /* jump to first case */
4862 block(&a
, csym
, &b
, &c
, case_reg
, 0);
4863 /* if no default, jmp after switch */
4871 if (tok
== TOK_CASE
) {
4878 if (gnu_ext
&& tok
== TOK_DOTS
) {
4882 tcc_warning("empty case range");
4884 /* since a case is like a label, we must skip it with a jmp */
4891 *case_sym
= gtst(1, 0);
4894 *case_sym
= gtst(1, 0);
4898 *case_sym
= gtst(1, *case_sym
);
4903 goto block_after_label
;
4905 if (tok
== TOK_DEFAULT
) {
4911 tcc_error("too many 'default'");
4914 goto block_after_label
;
4916 if (tok
== TOK_GOTO
) {
4918 if (tok
== '*' && gnu_ext
) {
4922 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
)
4925 } else if (tok
>= TOK_UIDENT
) {
4926 s
= label_find(tok
);
4927 /* put forward definition if needed */
4929 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
4931 if (s
->r
== LABEL_DECLARED
)
4932 s
->r
= LABEL_FORWARD
;
4934 /* label already defined */
4935 if (vla_flags
& VLA_IN_SCOPE
) {
4936 /* If VLAs are in use, save the current stack pointer and
4937 reset the stack pointer to what it was at function entry
4938 (label will restore stack pointer in inner scopes) */
4940 gen_vla_sp_restore(vla_sp_root_loc
);
4942 if (s
->r
& LABEL_FORWARD
)
4943 s
->jnext
= gjmp(s
->jnext
);
4945 gjmp_addr(s
->jnext
);
4948 expect("label identifier");
4951 } else if (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
) {
4957 if (vla_flags
& VLA_IN_SCOPE
) {
4958 /* save/restore stack pointer across label
4959 this is a no-op when combined with the load immediately
4960 after the label unless we arrive via goto */
4965 if (s
->r
== LABEL_DEFINED
)
4966 tcc_error("duplicate label '%s'", get_tok_str(s
->v
, NULL
));
4968 s
->r
= LABEL_DEFINED
;
4970 s
= label_push(&global_label_stack
, b
, LABEL_DEFINED
);
4973 if (vla_flags
& VLA_IN_SCOPE
) {
4974 gen_vla_sp_restore(*vla_sp_loc
);
4975 vla_flags
|= VLA_NEED_NEW_FRAME
;
4977 /* we accept this, but it is a mistake */
4980 tcc_warning("deprecated use of label at end of compound statement");
4984 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
4987 /* expression case */
5002 /* t is the array or struct type. c is the array or struct
5003 address. cur_index/cur_field is the pointer to the current
5004 value. 'size_only' is true if only size info is needed (only used
5006 static void decl_designator(CType
*type
, Section
*sec
, unsigned long c
,
5007 int *cur_index
, Sym
**cur_field
,
5011 int notfirst
, index
, index_last
, align
, l
, nb_elems
, elem_size
;
5017 if (gnu_ext
&& (l
= is_label()) != 0)
5019 while (tok
== '[' || tok
== '.') {
5021 if (!(type
->t
& VT_ARRAY
))
5022 expect("array type");
5025 index
= expr_const();
5026 if (index
< 0 || (s
->c
>= 0 && index
>= s
->c
))
5027 expect("invalid index");
5028 if (tok
== TOK_DOTS
&& gnu_ext
) {
5030 index_last
= expr_const();
5031 if (index_last
< 0 ||
5032 (s
->c
>= 0 && index_last
>= s
->c
) ||
5034 expect("invalid index");
5040 *cur_index
= index_last
;
5041 type
= pointed_type(type
);
5042 elem_size
= type_size(type
, &align
);
5043 c
+= index
* elem_size
;
5044 /* NOTE: we only support ranges for last designator */
5045 nb_elems
= index_last
- index
+ 1;
5046 if (nb_elems
!= 1) {
5055 if ((type
->t
& VT_BTYPE
) != VT_STRUCT
)
5056 expect("struct/union type");
5069 /* XXX: fix this mess by using explicit storage field */
5071 type1
.t
|= (type
->t
& ~VT_TYPE
);
5085 if (type
->t
& VT_ARRAY
) {
5087 type
= pointed_type(type
);
5088 c
+= index
* type_size(type
, &align
);
5092 tcc_error("too many field init");
5093 /* XXX: fix this mess by using explicit storage field */
5095 type1
.t
|= (type
->t
& ~VT_TYPE
);
5100 decl_initializer(type
, sec
, c
, 0, size_only
);
5102 /* XXX: make it more general */
5103 if (!size_only
&& nb_elems
> 1) {
5104 unsigned long c_end
;
5109 tcc_error("range init not supported yet for dynamic storage");
5110 c_end
= c
+ nb_elems
* elem_size
;
5111 if (c_end
> sec
->data_allocated
)
5112 section_realloc(sec
, c_end
);
5113 src
= sec
->data
+ c
;
5115 for(i
= 1; i
< nb_elems
; i
++) {
5117 memcpy(dst
, src
, elem_size
);
5123 #define EXPR_CONST 1
5126 /* store a value or an expression directly in global data or in local array */
5127 static void init_putv(CType
*type
, Section
*sec
, unsigned long c
,
5128 int v
, int expr_type
)
5130 int saved_global_expr
, bt
, bit_pos
, bit_size
;
5132 unsigned long long bit_mask
;
5140 /* compound literals must be allocated globally in this case */
5141 saved_global_expr
= global_expr
;
5144 global_expr
= saved_global_expr
;
5145 /* NOTE: symbols are accepted */
5146 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) != VT_CONST
)
5147 tcc_error("initializer element is not constant");
5155 dtype
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
5158 /* XXX: not portable */
5159 /* XXX: generate error if incorrect relocation */
5160 gen_assign_cast(&dtype
);
5161 bt
= type
->t
& VT_BTYPE
;
5162 /* we'll write at most 12 bytes */
5163 if (c
+ 12 > sec
->data_allocated
) {
5164 section_realloc(sec
, c
+ 12);
5166 ptr
= sec
->data
+ c
;
5167 /* XXX: make code faster ? */
5168 if (!(type
->t
& VT_BITFIELD
)) {
5173 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5174 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
5175 bit_mask
= (1LL << bit_size
) - 1;
5177 if ((vtop
->r
& VT_SYM
) &&
5183 (bt
== VT_INT
&& bit_size
!= 32)))
5184 tcc_error("initializer element is not computable at load time");
5187 vtop
->c
.i
= (vtop
->c
.i
!= 0);
5189 *(char *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5192 *(short *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5195 *(double *)ptr
= vtop
->c
.d
;
5198 *(long double *)ptr
= vtop
->c
.ld
;
5201 *(long long *)ptr
|= (vtop
->c
.ll
& bit_mask
) << bit_pos
;
5204 if (vtop
->r
& VT_SYM
) {
5205 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
5207 *(addr_t
*)ptr
|= (vtop
->c
.ptr_offset
& bit_mask
) << bit_pos
;
5210 if (vtop
->r
& VT_SYM
) {
5211 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
5213 *(int *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5218 vset(&dtype
, VT_LOCAL
|VT_LVAL
, c
);
5225 /* put zeros for variable based init */
5226 static void init_putz(CType
*t
, Section
*sec
, unsigned long c
, int size
)
5229 /* nothing to do because globals are already set to zero */
5231 vpush_global_sym(&func_old_type
, TOK_memset
);
5233 #ifdef TCC_TARGET_ARM
5244 /* 't' contains the type and storage info. 'c' is the offset of the
5245 object in section 'sec'. If 'sec' is NULL, it means stack based
5246 allocation. 'first' is true if array '{' must be read (multi
5247 dimension implicit array init handling). 'size_only' is true if
5248 size only evaluation is wanted (only for arrays). */
5249 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
,
5250 int first
, int size_only
)
5252 int index
, array_length
, n
, no_oblock
, nb
, parlevel
, parlevel1
, i
;
5253 int size1
, align1
, expr_type
;
5257 if (type
->t
& VT_VLA
) {
5260 /* save current stack pointer */
5261 if (vla_flags
& VLA_NEED_NEW_FRAME
) {
5263 vla_flags
= VLA_IN_SCOPE
;
5264 vla_sp_loc
= &vla_sp_loc_tmp
;
5267 vla_runtime_type_size(type
, &a
);
5268 gen_vla_alloc(type
, a
);
5269 vset(type
, VT_LOCAL
|VT_LVAL
, c
);
5273 } else if (type
->t
& VT_ARRAY
) {
5277 t1
= pointed_type(type
);
5278 size1
= type_size(t1
, &align1
);
5281 if ((first
&& tok
!= TOK_LSTR
&& tok
!= TOK_STR
) ||
5284 tcc_error("character array initializer must be a literal,"
5285 " optionally enclosed in braces");
5290 /* only parse strings here if correct type (otherwise: handle
5291 them as ((w)char *) expressions */
5292 if ((tok
== TOK_LSTR
&&
5293 #ifdef TCC_TARGET_PE
5294 (t1
->t
& VT_BTYPE
) == VT_SHORT
&& (t1
->t
& VT_UNSIGNED
)
5296 (t1
->t
& VT_BTYPE
) == VT_INT
5298 ) || (tok
== TOK_STR
&& (t1
->t
& VT_BTYPE
) == VT_BYTE
)) {
5299 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5304 /* compute maximum number of chars wanted */
5306 cstr_len
= cstr
->size
;
5308 cstr_len
= cstr
->size
/ sizeof(nwchar_t
);
5311 if (n
>= 0 && nb
> (n
- array_length
))
5312 nb
= n
- array_length
;
5315 tcc_warning("initializer-string for array is too long");
5316 /* in order to go faster for common case (char
5317 string in global variable, we handle it
5319 if (sec
&& tok
== TOK_STR
&& size1
== 1) {
5320 memcpy(sec
->data
+ c
+ array_length
, cstr
->data
, nb
);
5324 ch
= ((unsigned char *)cstr
->data
)[i
];
5326 ch
= ((nwchar_t
*)cstr
->data
)[i
];
5327 init_putv(t1
, sec
, c
+ (array_length
+ i
) * size1
,
5335 /* only add trailing zero if enough storage (no
5336 warning in this case since it is standard) */
5337 if (n
< 0 || array_length
< n
) {
5339 init_putv(t1
, sec
, c
+ (array_length
* size1
), 0, EXPR_VAL
);
5345 while (tok
!= '}') {
5346 decl_designator(type
, sec
, c
, &index
, NULL
, size_only
);
5347 if (n
>= 0 && index
>= n
)
5348 tcc_error("index too large");
5349 /* must put zero in holes (note that doing it that way
5350 ensures that it even works with designators) */
5351 if (!size_only
&& array_length
< index
) {
5352 init_putz(t1
, sec
, c
+ array_length
* size1
,
5353 (index
- array_length
) * size1
);
5356 if (index
> array_length
)
5357 array_length
= index
;
5358 /* special test for multi dimensional arrays (may not
5359 be strictly correct if designators are used at the
5361 if (index
>= n
&& no_oblock
)
5370 /* put zeros at the end */
5371 if (!size_only
&& n
>= 0 && array_length
< n
) {
5372 init_putz(t1
, sec
, c
+ array_length
* size1
,
5373 (n
- array_length
) * size1
);
5375 /* patch type size if needed */
5377 s
->c
= array_length
;
5378 } else if ((type
->t
& VT_BTYPE
) == VT_STRUCT
&&
5379 (sec
|| !first
|| tok
== '{')) {
5382 /* NOTE: the previous test is a specific case for automatic
5383 struct/union init */
5384 /* XXX: union needs only one init */
5386 /* XXX: this test is incorrect for local initializers
5387 beginning with ( without {. It would be much more difficult
5388 to do it correctly (ideally, the expression parser should
5389 be used in all cases) */
5395 while (tok
== '(') {
5399 if (!parse_btype(&type1
, &ad1
))
5401 type_decl(&type1
, &ad1
, &n
, TYPE_ABSTRACT
);
5403 if (!is_assignable_types(type
, &type1
))
5404 tcc_error("invalid type for cast");
5409 if (first
|| tok
== '{') {
5418 while (tok
!= '}') {
5419 decl_designator(type
, sec
, c
, NULL
, &f
, size_only
);
5421 if (!size_only
&& array_length
< index
) {
5422 init_putz(type
, sec
, c
+ array_length
,
5423 index
- array_length
);
5425 index
= index
+ type_size(&f
->type
, &align1
);
5426 if (index
> array_length
)
5427 array_length
= index
;
5429 /* gr: skip fields from same union - ugly. */
5431 ///printf("index: %2d %08x -- %2d %08x\n", f->c, f->type.t, f->next->c, f->next->type.t);
5432 /* test for same offset */
5433 if (f
->next
->c
!= f
->c
)
5435 /* if yes, test for bitfield shift */
5436 if ((f
->type
.t
& VT_BITFIELD
) && (f
->next
->type
.t
& VT_BITFIELD
)) {
5437 int bit_pos_1
= (f
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5438 int bit_pos_2
= (f
->next
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5439 //printf("bitfield %d %d\n", bit_pos_1, bit_pos_2);
5440 if (bit_pos_1
!= bit_pos_2
)
5447 if (no_oblock
&& f
== NULL
)
5453 /* put zeros at the end */
5454 if (!size_only
&& array_length
< n
) {
5455 init_putz(type
, sec
, c
+ array_length
,
5464 } else if (tok
== '{') {
5466 decl_initializer(type
, sec
, c
, first
, size_only
);
5468 } else if (size_only
) {
5469 /* just skip expression */
5470 parlevel
= parlevel1
= 0;
5471 while ((parlevel
> 0 || parlevel1
> 0 ||
5472 (tok
!= '}' && tok
!= ',')) && tok
!= -1) {
5475 else if (tok
== ')')
5477 else if (tok
== '{')
5479 else if (tok
== '}')
5484 /* currently, we always use constant expression for globals
5485 (may change for scripting case) */
5486 expr_type
= EXPR_CONST
;
5488 expr_type
= EXPR_ANY
;
5489 init_putv(type
, sec
, c
, 0, expr_type
);
5493 /* parse an initializer for type 't' if 'has_init' is non zero, and
5494 allocate space in local or global data space ('r' is either
5495 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
5496 variable 'v' with an associated name represented by 'asm_label' of
5497 scope 'scope' is declared before initializers are parsed. If 'v' is
5498 zero, then a reference to the new object is put in the value stack.
5499 If 'has_init' is 2, a special parsing is done to handle string
5501 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
,
5502 int has_init
, int v
, char *asm_label
,
5505 int size
, align
, addr
, data_offset
;
5507 ParseState saved_parse_state
= {0};
5508 TokenString init_str
;
5510 Sym
*flexible_array
;
5512 flexible_array
= NULL
;
5513 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
5514 Sym
*field
= type
->ref
->next
;
5517 field
= field
->next
;
5518 if (field
->type
.t
& VT_ARRAY
&& field
->type
.ref
->c
< 0)
5519 flexible_array
= field
;
5523 size
= type_size(type
, &align
);
5524 /* If unknown size, we must evaluate it before
5525 evaluating initializers because
5526 initializers can generate global data too
5527 (e.g. string pointers or ISOC99 compound
5528 literals). It also simplifies local
5529 initializers handling */
5530 tok_str_new(&init_str
);
5531 if (size
< 0 || (flexible_array
&& has_init
)) {
5533 tcc_error("unknown type size");
5534 /* get all init string */
5535 if (has_init
== 2) {
5536 /* only get strings */
5537 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5538 tok_str_add_tok(&init_str
);
5543 while (level
> 0 || (tok
!= ',' && tok
!= ';')) {
5545 tcc_error("unexpected end of file in initializer");
5546 tok_str_add_tok(&init_str
);
5549 else if (tok
== '}') {
5559 tok_str_add(&init_str
, -1);
5560 tok_str_add(&init_str
, 0);
5563 save_parse_state(&saved_parse_state
);
5565 macro_ptr
= init_str
.str
;
5567 decl_initializer(type
, NULL
, 0, 1, 1);
5568 /* prepare second initializer parsing */
5569 macro_ptr
= init_str
.str
;
5572 /* if still unknown size, error */
5573 size
= type_size(type
, &align
);
5575 tcc_error("unknown type size");
5578 size
+= flexible_array
->type
.ref
->c
* pointed_size(&flexible_array
->type
);
5579 /* take into account specified alignment if bigger */
5580 if (ad
->a
.aligned
) {
5581 if (ad
->a
.aligned
> align
)
5582 align
= ad
->a
.aligned
;
5583 } else if (ad
->a
.packed
) {
5586 if ((r
& VT_VALMASK
) == VT_LOCAL
) {
5588 #ifdef CONFIG_TCC_BCHECK
5589 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5593 loc
= (loc
- size
) & -align
;
5595 #ifdef CONFIG_TCC_BCHECK
5596 /* handles bounds */
5597 /* XXX: currently, since we do only one pass, we cannot track
5598 '&' operators, so we add only arrays */
5599 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5600 unsigned long *bounds_ptr
;
5601 /* add padding between regions */
5603 /* then add local bound info */
5604 bounds_ptr
= section_ptr_add(lbounds_section
, 2 * sizeof(unsigned long));
5605 bounds_ptr
[0] = addr
;
5606 bounds_ptr
[1] = size
;
5610 /* local variable */
5611 sym_push(v
, type
, r
, addr
);
5613 /* push local reference */
5614 vset(type
, r
, addr
);
5620 if (v
&& scope
== VT_CONST
) {
5621 /* see if the symbol was already defined */
5624 if (!is_compatible_types(&sym
->type
, type
))
5625 tcc_error("incompatible types for redefinition of '%s'",
5626 get_tok_str(v
, NULL
));
5627 if (sym
->type
.t
& VT_EXTERN
) {
5628 /* if the variable is extern, it was not allocated */
5629 sym
->type
.t
&= ~VT_EXTERN
;
5630 /* set array size if it was omitted in extern
5632 if ((sym
->type
.t
& VT_ARRAY
) &&
5633 sym
->type
.ref
->c
< 0 &&
5635 sym
->type
.ref
->c
= type
->ref
->c
;
5637 /* we accept several definitions of the same
5638 global variable. this is tricky, because we
5639 must play with the SHN_COMMON type of the symbol */
5640 /* XXX: should check if the variable was already
5641 initialized. It is incorrect to initialized it
5643 /* no init data, we won't add more to the symbol */
5650 /* allocate symbol in corresponding section */
5655 else if (tcc_state
->nocommon
)
5659 data_offset
= sec
->data_offset
;
5660 data_offset
= (data_offset
+ align
- 1) & -align
;
5662 /* very important to increment global pointer at this time
5663 because initializers themselves can create new initializers */
5664 data_offset
+= size
;
5665 #ifdef CONFIG_TCC_BCHECK
5666 /* add padding if bound check */
5667 if (tcc_state
->do_bounds_check
)
5670 sec
->data_offset
= data_offset
;
5671 /* allocate section space to put the data */
5672 if (sec
->sh_type
!= SHT_NOBITS
&&
5673 data_offset
> sec
->data_allocated
)
5674 section_realloc(sec
, data_offset
);
5675 /* align section if needed */
5676 if (align
> sec
->sh_addralign
)
5677 sec
->sh_addralign
= align
;
5679 addr
= 0; /* avoid warning */
5683 if (scope
!= VT_CONST
|| !sym
) {
5684 sym
= sym_push(v
, type
, r
| VT_SYM
, 0);
5685 sym
->asm_label
= asm_label
;
5687 /* update symbol definition */
5689 put_extern_sym(sym
, sec
, addr
, size
);
5692 /* put a common area */
5693 put_extern_sym(sym
, NULL
, align
, size
);
5694 /* XXX: find a nicer way */
5695 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
5696 esym
->st_shndx
= SHN_COMMON
;
5699 /* push global reference */
5700 sym
= get_sym_ref(type
, sec
, addr
, size
);
5701 vpushsym(type
, sym
);
5703 /* patch symbol weakness */
5704 if (type
->t
& VT_WEAK
)
5706 apply_visibility(sym
, type
);
5707 #ifdef CONFIG_TCC_BCHECK
5708 /* handles bounds now because the symbol must be defined
5709 before for the relocation */
5710 if (tcc_state
->do_bounds_check
) {
5711 unsigned long *bounds_ptr
;
5713 greloc(bounds_section
, sym
, bounds_section
->data_offset
, R_DATA_PTR
);
5714 /* then add global bound info */
5715 bounds_ptr
= section_ptr_add(bounds_section
, 2 * sizeof(long));
5716 bounds_ptr
[0] = 0; /* relocated */
5717 bounds_ptr
[1] = size
;
5721 if (has_init
|| (type
->t
& VT_VLA
)) {
5722 decl_initializer(type
, sec
, addr
, 1, 0);
5723 /* restore parse state if needed */
5725 tok_str_free(init_str
.str
);
5726 restore_parse_state(&saved_parse_state
);
5728 /* patch flexible array member size back to -1, */
5729 /* for possible subsequent similar declarations */
5731 flexible_array
->type
.ref
->c
= -1;
5736 static void put_func_debug(Sym
*sym
)
5741 /* XXX: we put here a dummy type */
5742 snprintf(buf
, sizeof(buf
), "%s:%c1",
5743 funcname
, sym
->type
.t
& VT_STATIC
? 'f' : 'F');
5744 put_stabs_r(buf
, N_FUN
, 0, file
->line_num
, 0,
5745 cur_text_section
, sym
->c
);
5746 /* //gr gdb wants a line at the function */
5747 put_stabn(N_SLINE
, 0, file
->line_num
, 0);
5752 /* parse an old style function declaration list */
5753 /* XXX: check multiple parameter */
5754 static void func_decl_list(Sym
*func_sym
)
5761 /* parse each declaration */
5762 while (tok
!= '{' && tok
!= ';' && tok
!= ',' && tok
!= TOK_EOF
&&
5763 tok
!= TOK_ASM1
&& tok
!= TOK_ASM2
&& tok
!= TOK_ASM3
) {
5764 if (!parse_btype(&btype
, &ad
))
5765 expect("declaration list");
5766 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
5767 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
5769 /* we accept no variable after */
5773 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
5774 /* find parameter in function parameter list */
5777 if ((s
->v
& ~SYM_FIELD
) == v
)
5781 tcc_error("declaration for parameter '%s' but no such parameter",
5782 get_tok_str(v
, NULL
));
5784 /* check that no storage specifier except 'register' was given */
5785 if (type
.t
& VT_STORAGE
)
5786 tcc_error("storage class specified for '%s'", get_tok_str(v
, NULL
));
5787 convert_parameter_type(&type
);
5788 /* we can add the type (NOTE: it could be local to the function) */
5790 /* accept other parameters */
5801 /* parse a function defined by symbol 'sym' and generate its code in
5802 'cur_text_section' */
5803 static void gen_function(Sym
*sym
)
5805 int saved_nocode_wanted
= nocode_wanted
;
5807 ind
= cur_text_section
->data_offset
;
5808 /* NOTE: we patch the symbol size later */
5809 put_extern_sym(sym
, cur_text_section
, ind
, 0);
5810 funcname
= get_tok_str(sym
->v
, NULL
);
5812 /* Initialize VLA state */
5813 vla_sp_loc
= &vla_sp_root_loc
;
5814 vla_flags
= VLA_NEED_NEW_FRAME
;
5815 /* put debug symbol */
5816 if (tcc_state
->do_debug
)
5817 put_func_debug(sym
);
5818 /* push a dummy symbol to enable local sym storage */
5819 sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
5820 gfunc_prolog(&sym
->type
);
5821 #ifdef CONFIG_TCC_BCHECK
5822 if (tcc_state
->do_bounds_check
5823 && !strcmp(get_tok_str(sym
->v
, NULL
), "main")) {
5827 for (i
= 0, sym
= local_stack
; i
< 2; i
++, sym
= sym
->prev
) {
5828 if (sym
->v
& SYM_FIELD
|| sym
->prev
->v
& SYM_FIELD
)
5830 vpush_global_sym(&func_old_type
, TOK___bound_main_arg
);
5831 vset(&sym
->type
, sym
->r
, sym
->c
);
5837 block(NULL
, NULL
, NULL
, NULL
, 0, 0);
5840 cur_text_section
->data_offset
= ind
;
5841 label_pop(&global_label_stack
, NULL
);
5842 /* reset local stack */
5843 scope_stack_bottom
= NULL
;
5844 sym_pop(&local_stack
, NULL
);
5845 /* end of function */
5846 /* patch symbol size */
5847 ((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
].st_size
=
5849 /* patch symbol weakness (this definition overrules any prototype) */
5850 if (sym
->type
.t
& VT_WEAK
)
5852 apply_visibility(sym
, &sym
->type
);
5853 if (tcc_state
->do_debug
) {
5854 put_stabn(N_FUN
, 0, 0, ind
- func_ind
);
5856 /* It's better to crash than to generate wrong code */
5857 cur_text_section
= NULL
;
5858 funcname
= ""; /* for safety */
5859 func_vt
.t
= VT_VOID
; /* for safety */
5860 func_var
= 0; /* for safety */
5861 ind
= 0; /* for safety */
5862 nocode_wanted
= saved_nocode_wanted
;
5865 ST_FUNC
void gen_inline_functions(void)
5868 int *str
, inline_generated
, i
;
5869 struct InlineFunc
*fn
;
5871 /* iterate while inline function are referenced */
5873 inline_generated
= 0;
5874 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
5875 fn
= tcc_state
->inline_fns
[i
];
5877 if (sym
&& sym
->c
) {
5878 /* the function was used: generate its code and
5879 convert it to a normal function */
5880 str
= fn
->token_str
;
5883 pstrcpy(file
->filename
, sizeof file
->filename
, fn
->filename
);
5884 sym
->r
= VT_SYM
| VT_CONST
;
5885 sym
->type
.t
&= ~VT_INLINE
;
5889 cur_text_section
= text_section
;
5891 macro_ptr
= NULL
; /* fail safe */
5893 inline_generated
= 1;
5896 if (!inline_generated
)
5899 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
5900 fn
= tcc_state
->inline_fns
[i
];
5901 str
= fn
->token_str
;
5904 dynarray_reset(&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
);
5907 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
5908 static int decl0(int l
, int is_for_loop_init
)
5916 if (!parse_btype(&btype
, &ad
)) {
5917 if (is_for_loop_init
)
5919 /* skip redundant ';' */
5920 /* XXX: find more elegant solution */
5925 if (l
== VT_CONST
&&
5926 (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
5927 /* global asm block */
5931 /* special test for old K&R protos without explicit int
5932 type. Only accepted when defining global data */
5933 if (l
== VT_LOCAL
|| tok
< TOK_DEFINE
)
5937 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
5938 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
5940 /* we accept no variable after */
5944 while (1) { /* iterate thru each declaration */
5945 char *asm_label
; // associated asm label
5947 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
5951 type_to_str(buf
, sizeof(buf
), t
, get_tok_str(v
, NULL
));
5952 printf("type = '%s'\n", buf
);
5955 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
5956 if ((type
.t
& VT_STATIC
) && (l
== VT_LOCAL
)) {
5957 tcc_error("function without file scope cannot be static");
5959 /* if old style function prototype, we accept a
5962 if (sym
->c
== FUNC_OLD
)
5963 func_decl_list(sym
);
5967 if (gnu_ext
&& (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
5970 asm_label_instr(&astr
);
5971 asm_label
= tcc_strdup(astr
.data
);
5974 /* parse one last attribute list, after asm label */
5975 parse_attribute(&ad
);
5980 #ifdef TCC_TARGET_PE
5981 if (ad
.a
.func_import
)
5982 type
.t
|= VT_IMPORT
;
5983 if (ad
.a
.func_export
)
5984 type
.t
|= VT_EXPORT
;
5986 type
.t
|= ad
.a
.visibility
<< VT_VIS_SHIFT
;
5990 tcc_error("cannot use local functions");
5991 if ((type
.t
& VT_BTYPE
) != VT_FUNC
)
5992 expect("function definition");
5994 /* reject abstract declarators in function definition */
5996 while ((sym
= sym
->next
) != NULL
)
5997 if (!(sym
->v
& ~SYM_FIELD
))
5998 expect("identifier");
6000 /* XXX: cannot do better now: convert extern line to static inline */
6001 if ((type
.t
& (VT_EXTERN
| VT_INLINE
)) == (VT_EXTERN
| VT_INLINE
))
6002 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
6007 if ((sym
->type
.t
& VT_BTYPE
) != VT_FUNC
)
6010 ref
= sym
->type
.ref
;
6011 if (0 == ref
->a
.func_proto
)
6012 tcc_error("redefinition of '%s'", get_tok_str(v
, NULL
));
6014 /* use func_call from prototype if not defined */
6015 if (ref
->a
.func_call
!= FUNC_CDECL
6016 && type
.ref
->a
.func_call
== FUNC_CDECL
)
6017 type
.ref
->a
.func_call
= ref
->a
.func_call
;
6019 /* use export from prototype */
6020 if (ref
->a
.func_export
)
6021 type
.ref
->a
.func_export
= 1;
6023 /* use static from prototype */
6024 if (sym
->type
.t
& VT_STATIC
)
6025 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
6027 /* If the definition has no visibility use the
6028 one from prototype. */
6029 if (! (type
.t
& VT_VIS_MASK
))
6030 type
.t
|= sym
->type
.t
& VT_VIS_MASK
;
6032 if (!is_compatible_types(&sym
->type
, &type
)) {
6034 tcc_error("incompatible types for redefinition of '%s'",
6035 get_tok_str(v
, NULL
));
6037 type
.ref
->a
.func_proto
= 0;
6038 /* if symbol is already defined, then put complete type */
6041 /* put function symbol */
6042 sym
= global_identifier_push(v
, type
.t
, 0);
6043 sym
->type
.ref
= type
.ref
;
6046 /* static inline functions are just recorded as a kind
6047 of macro. Their code will be emitted at the end of
6048 the compilation unit only if they are used */
6049 if ((type
.t
& (VT_INLINE
| VT_STATIC
)) ==
6050 (VT_INLINE
| VT_STATIC
)) {
6051 TokenString func_str
;
6053 struct InlineFunc
*fn
;
6054 const char *filename
;
6056 tok_str_new(&func_str
);
6062 tcc_error("unexpected end of file");
6063 tok_str_add_tok(&func_str
);
6068 } else if (t
== '}') {
6070 if (block_level
== 0)
6074 tok_str_add(&func_str
, -1);
6075 tok_str_add(&func_str
, 0);
6076 filename
= file
? file
->filename
: "";
6077 fn
= tcc_malloc(sizeof *fn
+ strlen(filename
));
6078 strcpy(fn
->filename
, filename
);
6080 fn
->token_str
= func_str
.str
;
6081 dynarray_add((void ***)&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
, fn
);
6084 /* compute text section */
6085 cur_text_section
= ad
.section
;
6086 if (!cur_text_section
)
6087 cur_text_section
= text_section
;
6088 sym
->r
= VT_SYM
| VT_CONST
;
6093 if (btype
.t
& VT_TYPEDEF
) {
6094 /* save typedefed type */
6095 /* XXX: test storage specifiers ? */
6096 sym
= sym_push(v
, &type
, 0, 0);
6098 sym
->type
.t
|= VT_TYPEDEF
;
6101 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
6102 /* external function definition */
6103 /* specific case for func_call attribute */
6104 ad
.a
.func_proto
= 1;
6106 } else if (!(type
.t
& VT_ARRAY
)) {
6107 /* not lvalue if array */
6108 r
|= lvalue_type(type
.t
);
6110 has_init
= (tok
== '=');
6111 if (has_init
&& (type
.t
& VT_VLA
))
6112 tcc_error("Variable length array cannot be initialized");
6113 if ((btype
.t
& VT_EXTERN
) || ((type
.t
& VT_BTYPE
) == VT_FUNC
) ||
6114 ((type
.t
& VT_ARRAY
) && (type
.t
& VT_STATIC
) &&
6115 !has_init
&& l
== VT_CONST
&& type
.ref
->c
< 0)) {
6116 /* external variable or function */
6117 /* NOTE: as GCC, uninitialized global static
6118 arrays of null size are considered as
6120 sym
= external_sym(v
, &type
, r
, asm_label
);
6122 if (ad
.alias_target
) {
6127 alias_target
= sym_find(ad
.alias_target
);
6128 if (!alias_target
|| !alias_target
->c
)
6129 tcc_error("unsupported forward __alias__ attribute");
6130 esym
= &((Elf32_Sym
*)symtab_section
->data
)[alias_target
->c
];
6131 tsec
.sh_num
= esym
->st_shndx
;
6132 put_extern_sym2(sym
, &tsec
, esym
->st_value
, esym
->st_size
, 0);
6135 type
.t
|= (btype
.t
& VT_STATIC
); /* Retain "static". */
6136 if (type
.t
& VT_STATIC
)
6142 decl_initializer_alloc(&type
, &ad
, r
, has_init
, v
, asm_label
, l
);
6146 if (is_for_loop_init
)
6159 ST_FUNC
void decl(int l
)