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 #if defined(TCC_TARGET_ARM64) || defined(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 #if !defined(TCC_TARGET_ARM64) && !defined(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 ST_FUNC
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
;
806 #ifndef TCC_TARGET_ARM64
809 #ifdef TCC_TARGET_X86_64
810 else if (rc
== RC_FRET
)
815 /* need to reload if:
817 - lvalue (need to dereference pointer)
818 - already a register, but not in the right class */
820 || (vtop
->r
& VT_LVAL
)
821 || !(reg_classes
[r
] & rc
)
822 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
823 || ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
&& !(reg_classes
[vtop
->r2
] & rc2
))
824 || ((vtop
->type
.t
& VT_BTYPE
) == VT_QFLOAT
&& !(reg_classes
[vtop
->r2
] & rc2
))
826 || ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
&& !(reg_classes
[vtop
->r2
] & rc2
))
831 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
832 if (((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) || ((vtop
->type
.t
& VT_BTYPE
) == VT_QFLOAT
)) {
833 int addr_type
= VT_LLONG
, load_size
= 8, load_type
= ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) ? VT_LLONG
: VT_DOUBLE
;
835 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
836 int addr_type
= VT_INT
, load_size
= 4, load_type
= VT_INT
;
837 unsigned long long ll
;
839 int r2
, original_type
;
840 original_type
= vtop
->type
.t
;
841 /* two register type load : expand to two words
843 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
844 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
847 vtop
->c
.ui
= ll
; /* first word */
849 vtop
->r
= r
; /* save register value */
850 vpushi(ll
>> 32); /* second word */
853 if (r
>= VT_CONST
|| /* XXX: test to VT_CONST incorrect ? */
854 (vtop
->r
& VT_LVAL
)) {
855 /* We do not want to modifier the long long
856 pointer here, so the safest (and less
857 efficient) is to save all the other registers
858 in the stack. XXX: totally inefficient. */
860 /* load from memory */
861 vtop
->type
.t
= load_type
;
864 vtop
[-1].r
= r
; /* save register value */
865 /* increment pointer to get second word */
866 vtop
->type
.t
= addr_type
;
871 vtop
->type
.t
= load_type
;
876 vtop
[-1].r
= r
; /* save register value */
877 vtop
->r
= vtop
[-1].r2
;
879 /* Allocate second register. Here we rely on the fact that
880 get_reg() tries first to free r2 of an SValue. */
884 /* write second register */
886 vtop
->type
.t
= original_type
;
887 } else if ((vtop
->r
& VT_LVAL
) && !is_float(vtop
->type
.t
)) {
889 /* lvalue of scalar type : need to use lvalue type
890 because of possible cast */
893 /* compute memory access type */
894 if (vtop
->r
& VT_REF
)
895 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
900 else if (vtop
->r
& VT_LVAL_BYTE
)
902 else if (vtop
->r
& VT_LVAL_SHORT
)
904 if (vtop
->r
& VT_LVAL_UNSIGNED
)
908 /* restore wanted type */
911 /* one register type load */
916 #ifdef TCC_TARGET_C67
917 /* uses register pairs for doubles */
918 if ((vtop
->type
.t
& VT_BTYPE
) == VT_DOUBLE
)
925 /* generate vtop[-1] and vtop[0] in resp. classes rc1 and rc2 */
926 ST_FUNC
void gv2(int rc1
, int rc2
)
930 /* generate more generic register first. But VT_JMP or VT_CMP
931 values must be generated first in all cases to avoid possible
933 v
= vtop
[0].r
& VT_VALMASK
;
934 if (v
!= VT_CMP
&& (v
& ~1) != VT_JMP
&& rc1
<= rc2
) {
939 /* test if reload is needed for first register */
940 if ((vtop
[-1].r
& VT_VALMASK
) >= VT_CONST
) {
950 /* test if reload is needed for first register */
951 if ((vtop
[0].r
& VT_VALMASK
) >= VT_CONST
) {
957 #ifndef TCC_TARGET_ARM64
958 /* wrapper around RC_FRET to return a register by type */
959 static int rc_fret(int t
)
961 #ifdef TCC_TARGET_X86_64
962 if (t
== VT_LDOUBLE
) {
970 /* wrapper around REG_FRET to return a register by type */
971 static int reg_fret(int t
)
973 #ifdef TCC_TARGET_X86_64
974 if (t
== VT_LDOUBLE
) {
981 /* expand long long on stack in two int registers */
982 static void lexpand(void)
986 u
= vtop
->type
.t
& (VT_DEFSIGN
| VT_UNSIGNED
);
989 vtop
[0].r
= vtop
[-1].r2
;
990 vtop
[0].r2
= VT_CONST
;
991 vtop
[-1].r2
= VT_CONST
;
992 vtop
[0].type
.t
= VT_INT
| u
;
993 vtop
[-1].type
.t
= VT_INT
| u
;
996 #ifdef TCC_TARGET_ARM
997 /* expand long long on stack */
998 ST_FUNC
void lexpand_nr(void)
1002 u
= vtop
->type
.t
& (VT_DEFSIGN
| VT_UNSIGNED
);
1004 vtop
->r2
= VT_CONST
;
1005 vtop
->type
.t
= VT_INT
| u
;
1006 v
=vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
);
1007 if (v
== VT_CONST
) {
1008 vtop
[-1].c
.ui
= vtop
->c
.ull
;
1009 vtop
->c
.ui
= vtop
->c
.ull
>> 32;
1011 } else if (v
== (VT_LVAL
|VT_CONST
) || v
== (VT_LVAL
|VT_LOCAL
)) {
1013 vtop
->r
= vtop
[-1].r
;
1014 } else if (v
> VT_CONST
) {
1018 vtop
->r
= vtop
[-1].r2
;
1019 vtop
[-1].r2
= VT_CONST
;
1020 vtop
[-1].type
.t
= VT_INT
| u
;
1024 /* build a long long from two ints */
1025 static void lbuild(int t
)
1027 gv2(RC_INT
, RC_INT
);
1028 vtop
[-1].r2
= vtop
[0].r
;
1029 vtop
[-1].type
.t
= t
;
1033 /* rotate n first stack elements to the bottom
1034 I1 ... In -> I2 ... In I1 [top is right]
1036 ST_FUNC
void vrotb(int n
)
1042 for(i
=-n
+1;i
!=0;i
++)
1043 vtop
[i
] = vtop
[i
+1];
1047 /* rotate the n elements before entry e towards the top
1048 I1 ... In ... -> In I1 ... I(n-1) ... [top is right]
1050 ST_FUNC
void vrote(SValue
*e
, int n
)
1056 for(i
= 0;i
< n
- 1; i
++)
1061 /* rotate n first stack elements to the top
1062 I1 ... In -> In I1 ... I(n-1) [top is right]
1064 ST_FUNC
void vrott(int n
)
1069 /* pop stack value */
1070 ST_FUNC
void vpop(void)
1073 v
= vtop
->r
& VT_VALMASK
;
1074 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
1075 /* for x86, we need to pop the FP stack */
1076 if (v
== TREG_ST0
&& !nocode_wanted
) {
1077 o(0xd8dd); /* fstp %st(0) */
1080 if (v
== VT_JMP
|| v
== VT_JMPI
) {
1081 /* need to put correct jump if && or || without test */
1087 /* convert stack entry to register and duplicate its value in another
1089 static void gv_dup(void)
1095 if ((t
& VT_BTYPE
) == VT_LLONG
) {
1102 /* stack: H L L1 H1 */
1110 /* duplicate value */
1115 #ifdef TCC_TARGET_X86_64
1116 if ((t
& VT_BTYPE
) == VT_LDOUBLE
) {
1126 load(r1
, &sv
); /* move r to r1 */
1128 /* duplicates value */
1134 /* Generate value test
1136 * Generate a test for any value (jump, comparison and integers) */
1137 ST_FUNC
int gvtst(int inv
, int t
)
1139 int v
= vtop
->r
& VT_VALMASK
;
1140 if (v
!= VT_CMP
&& v
!= VT_JMP
&& v
!= VT_JMPI
) {
1144 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
1145 /* constant jmp optimization */
1146 if ((vtop
->c
.i
!= 0) != inv
)
1151 return gtst(inv
, t
);
1154 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
1155 /* generate CPU independent (unsigned) long long operations */
1156 static void gen_opl(int op
)
1158 int t
, a
, b
, op1
, c
, i
;
1160 unsigned short reg_iret
= REG_IRET
;
1161 unsigned short reg_lret
= REG_LRET
;
1167 func
= TOK___divdi3
;
1170 func
= TOK___udivdi3
;
1173 func
= TOK___moddi3
;
1176 func
= TOK___umoddi3
;
1183 /* call generic long long function */
1184 vpush_global_sym(&func_old_type
, func
);
1189 vtop
->r2
= reg_lret
;
1202 /* stack: L1 H1 L2 H2 */
1207 vtop
[-2] = vtop
[-3];
1210 /* stack: H1 H2 L1 L2 */
1216 /* stack: H1 H2 L1 L2 ML MH */
1219 /* stack: ML MH H1 H2 L1 L2 */
1223 /* stack: ML MH H1 L2 H2 L1 */
1228 /* stack: ML MH M1 M2 */
1231 } else if (op
== '+' || op
== '-') {
1232 /* XXX: add non carry method too (for MIPS or alpha) */
1238 /* stack: H1 H2 (L1 op L2) */
1241 gen_op(op1
+ 1); /* TOK_xxxC2 */
1244 /* stack: H1 H2 (L1 op L2) */
1247 /* stack: (L1 op L2) H1 H2 */
1249 /* stack: (L1 op L2) (H1 op H2) */
1257 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
1258 t
= vtop
[-1].type
.t
;
1262 /* stack: L H shift */
1264 /* constant: simpler */
1265 /* NOTE: all comments are for SHL. the other cases are
1266 done by swaping words */
1277 if (op
!= TOK_SAR
) {
1310 /* XXX: should provide a faster fallback on x86 ? */
1313 func
= TOK___ashrdi3
;
1316 func
= TOK___lshrdi3
;
1319 func
= TOK___ashldi3
;
1325 /* compare operations */
1331 /* stack: L1 H1 L2 H2 */
1333 vtop
[-1] = vtop
[-2];
1335 /* stack: L1 L2 H1 H2 */
1338 /* when values are equal, we need to compare low words. since
1339 the jump is inverted, we invert the test too. */
1342 else if (op1
== TOK_GT
)
1344 else if (op1
== TOK_ULT
)
1346 else if (op1
== TOK_UGT
)
1351 if (op1
!= TOK_NE
) {
1355 /* generate non equal test */
1356 /* XXX: NOT PORTABLE yet */
1360 #if defined(TCC_TARGET_I386)
1361 b
= psym(0x850f, 0);
1362 #elif defined(TCC_TARGET_ARM)
1364 o(0x1A000000 | encbranch(ind
, 0, 1));
1365 #elif defined(TCC_TARGET_C67) || defined(TCC_TARGET_ARM64)
1366 tcc_error("not implemented");
1368 #error not supported
1372 /* compare low. Always unsigned */
1376 else if (op1
== TOK_LE
)
1378 else if (op1
== TOK_GT
)
1380 else if (op1
== TOK_GE
)
1391 /* handle integer constant optimizations and various machine
1393 static void gen_opic(int op
)
1395 int c1
, c2
, t1
, t2
, n
;
1398 typedef unsigned long long U
;
1402 t1
= v1
->type
.t
& VT_BTYPE
;
1403 t2
= v2
->type
.t
& VT_BTYPE
;
1407 else if (v1
->type
.t
& VT_UNSIGNED
)
1414 else if (v2
->type
.t
& VT_UNSIGNED
)
1419 /* currently, we cannot do computations with forward symbols */
1420 c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1421 c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1424 case '+': l1
+= l2
; break;
1425 case '-': l1
-= l2
; break;
1426 case '&': l1
&= l2
; break;
1427 case '^': l1
^= l2
; break;
1428 case '|': l1
|= l2
; break;
1429 case '*': l1
*= l2
; break;
1436 /* if division by zero, generate explicit division */
1439 tcc_error("division by zero in constant");
1443 default: l1
/= l2
; break;
1444 case '%': l1
%= l2
; break;
1445 case TOK_UDIV
: l1
= (U
)l1
/ l2
; break;
1446 case TOK_UMOD
: l1
= (U
)l1
% l2
; break;
1449 case TOK_SHL
: l1
<<= l2
; break;
1450 case TOK_SHR
: l1
= (U
)l1
>> l2
; break;
1451 case TOK_SAR
: l1
>>= l2
; break;
1453 case TOK_ULT
: l1
= (U
)l1
< (U
)l2
; break;
1454 case TOK_UGE
: l1
= (U
)l1
>= (U
)l2
; break;
1455 case TOK_EQ
: l1
= l1
== l2
; break;
1456 case TOK_NE
: l1
= l1
!= l2
; break;
1457 case TOK_ULE
: l1
= (U
)l1
<= (U
)l2
; break;
1458 case TOK_UGT
: l1
= (U
)l1
> (U
)l2
; break;
1459 case TOK_LT
: l1
= l1
< l2
; break;
1460 case TOK_GE
: l1
= l1
>= l2
; break;
1461 case TOK_LE
: l1
= l1
<= l2
; break;
1462 case TOK_GT
: l1
= l1
> l2
; break;
1464 case TOK_LAND
: l1
= l1
&& l2
; break;
1465 case TOK_LOR
: l1
= l1
|| l2
; break;
1472 /* if commutative ops, put c2 as constant */
1473 if (c1
&& (op
== '+' || op
== '&' || op
== '^' ||
1474 op
== '|' || op
== '*')) {
1476 c2
= c1
; //c = c1, c1 = c2, c2 = c;
1477 l2
= l1
; //l = l1, l1 = l2, l2 = l;
1479 /* Filter out NOP operations like x*1, x-0, x&-1... */
1480 if (c2
&& (((op
== '*' || op
== '/' || op
== TOK_UDIV
||
1483 ((op
== '+' || op
== '-' || op
== '|' || op
== '^' ||
1484 op
== TOK_SHL
|| op
== TOK_SHR
|| op
== TOK_SAR
) &&
1490 } else if (c2
&& (op
== '*' || op
== TOK_PDIV
|| op
== TOK_UDIV
)) {
1491 /* try to use shifts instead of muls or divs */
1492 if (l2
> 0 && (l2
& (l2
- 1)) == 0) {
1501 else if (op
== TOK_PDIV
)
1507 } else if (c2
&& (op
== '+' || op
== '-') &&
1508 (((vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
))
1509 || (vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
)) == VT_LOCAL
)) {
1510 /* symbol + constant case */
1517 if (!nocode_wanted
) {
1518 /* call low level op generator */
1519 if (t1
== VT_LLONG
|| t2
== VT_LLONG
||
1520 (PTR_SIZE
== 8 && (t1
== VT_PTR
|| t2
== VT_PTR
)))
1531 /* generate a floating point operation with constant propagation */
1532 static void gen_opif(int op
)
1540 /* currently, we cannot do computations with forward symbols */
1541 c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1542 c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1544 if (v1
->type
.t
== VT_FLOAT
) {
1547 } else if (v1
->type
.t
== VT_DOUBLE
) {
1555 /* NOTE: we only do constant propagation if finite number (not
1556 NaN or infinity) (ANSI spec) */
1557 if (!ieee_finite(f1
) || !ieee_finite(f2
))
1561 case '+': f1
+= f2
; break;
1562 case '-': f1
-= f2
; break;
1563 case '*': f1
*= f2
; break;
1567 tcc_error("division by zero in constant");
1572 /* XXX: also handles tests ? */
1576 /* XXX: overflow test ? */
1577 if (v1
->type
.t
== VT_FLOAT
) {
1579 } else if (v1
->type
.t
== VT_DOUBLE
) {
1587 if (!nocode_wanted
) {
1595 static int pointed_size(CType
*type
)
1598 return type_size(pointed_type(type
), &align
);
1601 static void vla_runtime_pointed_size(CType
*type
)
1604 vla_runtime_type_size(pointed_type(type
), &align
);
1607 static inline int is_null_pointer(SValue
*p
)
1609 if ((p
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
1611 return ((p
->type
.t
& VT_BTYPE
) == VT_INT
&& p
->c
.i
== 0) ||
1612 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& p
->c
.ll
== 0) ||
1613 ((p
->type
.t
& VT_BTYPE
) == VT_PTR
&& p
->c
.ptr_offset
== 0);
1616 static inline int is_integer_btype(int bt
)
1618 return (bt
== VT_BYTE
|| bt
== VT_SHORT
||
1619 bt
== VT_INT
|| bt
== VT_LLONG
);
1622 /* check types for comparison or subtraction of pointers */
1623 static void check_comparison_pointer_types(SValue
*p1
, SValue
*p2
, int op
)
1625 CType
*type1
, *type2
, tmp_type1
, tmp_type2
;
1628 /* null pointers are accepted for all comparisons as gcc */
1629 if (is_null_pointer(p1
) || is_null_pointer(p2
))
1633 bt1
= type1
->t
& VT_BTYPE
;
1634 bt2
= type2
->t
& VT_BTYPE
;
1635 /* accept comparison between pointer and integer with a warning */
1636 if ((is_integer_btype(bt1
) || is_integer_btype(bt2
)) && op
!= '-') {
1637 if (op
!= TOK_LOR
&& op
!= TOK_LAND
)
1638 tcc_warning("comparison between pointer and integer");
1642 /* both must be pointers or implicit function pointers */
1643 if (bt1
== VT_PTR
) {
1644 type1
= pointed_type(type1
);
1645 } else if (bt1
!= VT_FUNC
)
1646 goto invalid_operands
;
1648 if (bt2
== VT_PTR
) {
1649 type2
= pointed_type(type2
);
1650 } else if (bt2
!= VT_FUNC
) {
1652 tcc_error("invalid operands to binary %s", get_tok_str(op
, NULL
));
1654 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
1655 (type2
->t
& VT_BTYPE
) == VT_VOID
)
1659 tmp_type1
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1660 tmp_type2
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1661 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
1662 /* gcc-like error if '-' is used */
1664 goto invalid_operands
;
1666 tcc_warning("comparison of distinct pointer types lacks a cast");
1670 /* generic gen_op: handles types problems */
1671 ST_FUNC
void gen_op(int op
)
1673 int u
, t1
, t2
, bt1
, bt2
, t
;
1676 t1
= vtop
[-1].type
.t
;
1677 t2
= vtop
[0].type
.t
;
1678 bt1
= t1
& VT_BTYPE
;
1679 bt2
= t2
& VT_BTYPE
;
1681 if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
1682 /* at least one operand is a pointer */
1683 /* relationnal op: must be both pointers */
1684 if (op
>= TOK_ULT
&& op
<= TOK_LOR
) {
1685 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1686 /* pointers are handled are unsigned */
1687 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1688 t
= VT_LLONG
| VT_UNSIGNED
;
1690 t
= VT_INT
| VT_UNSIGNED
;
1694 /* if both pointers, then it must be the '-' op */
1695 if (bt1
== VT_PTR
&& bt2
== VT_PTR
) {
1697 tcc_error("cannot use pointers here");
1698 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1699 /* XXX: check that types are compatible */
1700 if (vtop
[-1].type
.t
& VT_VLA
) {
1701 vla_runtime_pointed_size(&vtop
[-1].type
);
1703 vpushi(pointed_size(&vtop
[-1].type
));
1707 /* set to integer type */
1708 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1709 vtop
->type
.t
= VT_LLONG
;
1711 vtop
->type
.t
= VT_INT
;
1716 /* exactly one pointer : must be '+' or '-'. */
1717 if (op
!= '-' && op
!= '+')
1718 tcc_error("cannot use pointers here");
1719 /* Put pointer as first operand */
1720 if (bt2
== VT_PTR
) {
1724 type1
= vtop
[-1].type
;
1725 type1
.t
&= ~VT_ARRAY
;
1726 if (vtop
[-1].type
.t
& VT_VLA
)
1727 vla_runtime_pointed_size(&vtop
[-1].type
);
1729 u
= pointed_size(&vtop
[-1].type
);
1731 tcc_error("unknown array element size");
1732 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1735 /* XXX: cast to int ? (long long case) */
1740 #ifdef CONFIG_TCC_BCHECK
1741 /* if evaluating constant expression, no code should be
1742 generated, so no bound check */
1743 if (tcc_state
->do_bounds_check
&& !const_wanted
) {
1744 /* if bounded pointers, we generate a special code to
1751 gen_bounded_ptr_add();
1757 /* put again type if gen_opic() swaped operands */
1760 } else if (is_float(bt1
) || is_float(bt2
)) {
1761 /* compute bigger type and do implicit casts */
1762 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
1764 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
1769 /* floats can only be used for a few operations */
1770 if (op
!= '+' && op
!= '-' && op
!= '*' && op
!= '/' &&
1771 (op
< TOK_ULT
|| op
> TOK_GT
))
1772 tcc_error("invalid operands for binary operation");
1774 } else if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
) {
1775 t
= bt1
== VT_LLONG
? VT_LLONG
: VT_INT
;
1776 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (t
| VT_UNSIGNED
))
1779 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
1780 /* cast to biggest op */
1782 /* convert to unsigned if it does not fit in a long long */
1783 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
1784 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
1787 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
1788 tcc_error("comparison of struct");
1790 /* integer operations */
1792 /* convert to unsigned if it does not fit in an integer */
1793 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
1794 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
1797 /* XXX: currently, some unsigned operations are explicit, so
1798 we modify them here */
1799 if (t
& VT_UNSIGNED
) {
1806 else if (op
== TOK_LT
)
1808 else if (op
== TOK_GT
)
1810 else if (op
== TOK_LE
)
1812 else if (op
== TOK_GE
)
1819 /* special case for shifts and long long: we keep the shift as
1821 if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
)
1828 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
1829 /* relationnal op: the result is an int */
1830 vtop
->type
.t
= VT_INT
;
1835 // Make sure that we have converted to an rvalue:
1836 if (vtop
->r
& VT_LVAL
)
1837 gv(is_float(vtop
->type
.t
& VT_BTYPE
) ? RC_FLOAT
: RC_INT
);
1840 #ifndef TCC_TARGET_ARM
1841 /* generic itof for unsigned long long case */
1842 static void gen_cvt_itof1(int t
)
1844 #ifdef TCC_TARGET_ARM64
1847 if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
1848 (VT_LLONG
| VT_UNSIGNED
)) {
1851 vpush_global_sym(&func_old_type
, TOK___floatundisf
);
1852 #if LDOUBLE_SIZE != 8
1853 else if (t
== VT_LDOUBLE
)
1854 vpush_global_sym(&func_old_type
, TOK___floatundixf
);
1857 vpush_global_sym(&func_old_type
, TOK___floatundidf
);
1861 vtop
->r
= reg_fret(t
);
1869 /* generic ftoi for unsigned long long case */
1870 static void gen_cvt_ftoi1(int t
)
1872 #ifdef TCC_TARGET_ARM64
1877 if (t
== (VT_LLONG
| VT_UNSIGNED
)) {
1878 /* not handled natively */
1879 st
= vtop
->type
.t
& VT_BTYPE
;
1881 vpush_global_sym(&func_old_type
, TOK___fixunssfdi
);
1882 #if LDOUBLE_SIZE != 8
1883 else if (st
== VT_LDOUBLE
)
1884 vpush_global_sym(&func_old_type
, TOK___fixunsxfdi
);
1887 vpush_global_sym(&func_old_type
, TOK___fixunsdfdi
);
1892 vtop
->r2
= REG_LRET
;
1899 /* force char or short cast */
1900 static void force_charshort_cast(int t
)
1904 /* XXX: add optimization if lvalue : just change type and offset */
1909 if (t
& VT_UNSIGNED
) {
1910 vpushi((1 << bits
) - 1);
1916 /* result must be signed or the SAR is converted to an SHL
1917 This was not the case when "t" was a signed short
1918 and the last value on the stack was an unsigned int */
1919 vtop
->type
.t
&= ~VT_UNSIGNED
;
1925 /* cast 'vtop' to 'type'. Casting to bitfields is forbidden. */
1926 static void gen_cast(CType
*type
)
1928 int sbt
, dbt
, sf
, df
, c
, p
;
1930 /* special delayed cast for char/short */
1931 /* XXX: in some cases (multiple cascaded casts), it may still
1933 if (vtop
->r
& VT_MUSTCAST
) {
1934 vtop
->r
&= ~VT_MUSTCAST
;
1935 force_charshort_cast(vtop
->type
.t
);
1938 /* bitfields first get cast to ints */
1939 if (vtop
->type
.t
& VT_BITFIELD
) {
1943 dbt
= type
->t
& (VT_BTYPE
| VT_UNSIGNED
);
1944 sbt
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
1949 c
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1950 p
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
);
1952 /* constant case: we can do it now */
1953 /* XXX: in ISOC, cannot do it if error in convert */
1954 if (sbt
== VT_FLOAT
)
1955 vtop
->c
.ld
= vtop
->c
.f
;
1956 else if (sbt
== VT_DOUBLE
)
1957 vtop
->c
.ld
= vtop
->c
.d
;
1960 if ((sbt
& VT_BTYPE
) == VT_LLONG
) {
1961 if (sbt
& VT_UNSIGNED
)
1962 vtop
->c
.ld
= vtop
->c
.ull
;
1964 vtop
->c
.ld
= vtop
->c
.ll
;
1966 if (sbt
& VT_UNSIGNED
)
1967 vtop
->c
.ld
= vtop
->c
.ui
;
1969 vtop
->c
.ld
= vtop
->c
.i
;
1972 if (dbt
== VT_FLOAT
)
1973 vtop
->c
.f
= (float)vtop
->c
.ld
;
1974 else if (dbt
== VT_DOUBLE
)
1975 vtop
->c
.d
= (double)vtop
->c
.ld
;
1976 } else if (sf
&& dbt
== (VT_LLONG
|VT_UNSIGNED
)) {
1977 vtop
->c
.ull
= (unsigned long long)vtop
->c
.ld
;
1978 } else if (sf
&& dbt
== VT_BOOL
) {
1979 vtop
->c
.i
= (vtop
->c
.ld
!= 0);
1982 vtop
->c
.ll
= (long long)vtop
->c
.ld
;
1983 else if (sbt
== (VT_LLONG
|VT_UNSIGNED
))
1984 vtop
->c
.ll
= vtop
->c
.ull
;
1985 else if (sbt
& VT_UNSIGNED
)
1986 vtop
->c
.ll
= vtop
->c
.ui
;
1987 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1988 else if (sbt
== VT_PTR
)
1991 else if (sbt
!= VT_LLONG
)
1992 vtop
->c
.ll
= vtop
->c
.i
;
1994 if (dbt
== (VT_LLONG
|VT_UNSIGNED
))
1995 vtop
->c
.ull
= vtop
->c
.ll
;
1996 else if (dbt
== VT_BOOL
)
1997 vtop
->c
.i
= (vtop
->c
.ll
!= 0);
1998 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1999 else if (dbt
== VT_PTR
)
2002 else if (dbt
!= VT_LLONG
) {
2004 if ((dbt
& VT_BTYPE
) == VT_BYTE
)
2006 else if ((dbt
& VT_BTYPE
) == VT_SHORT
)
2008 if(dbt
& VT_UNSIGNED
)
2009 vtop
->c
.ui
= ((unsigned int)vtop
->c
.ll
<< s
) >> s
;
2011 vtop
->c
.i
= ((int)vtop
->c
.ll
<< s
) >> s
;
2014 } else if (p
&& dbt
== VT_BOOL
) {
2017 } else if (!nocode_wanted
) {
2018 /* non constant case: generate code */
2020 /* convert from fp to fp */
2023 /* convert int to fp */
2026 /* convert fp to int */
2027 if (dbt
== VT_BOOL
) {
2031 /* we handle char/short/etc... with generic code */
2032 if (dbt
!= (VT_INT
| VT_UNSIGNED
) &&
2033 dbt
!= (VT_LLONG
| VT_UNSIGNED
) &&
2037 if (dbt
== VT_INT
&& (type
->t
& (VT_BTYPE
| VT_UNSIGNED
)) != dbt
) {
2038 /* additional cast for char/short... */
2043 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
2044 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
) {
2045 if ((sbt
& VT_BTYPE
) != VT_LLONG
) {
2046 /* scalar to long long */
2047 /* machine independent conversion */
2049 /* generate high word */
2050 if (sbt
== (VT_INT
| VT_UNSIGNED
)) {
2054 if (sbt
== VT_PTR
) {
2055 /* cast from pointer to int before we apply
2056 shift operation, which pointers don't support*/
2057 gen_cast(&int_type
);
2063 /* patch second register */
2064 vtop
[-1].r2
= vtop
->r
;
2068 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
||
2069 (dbt
& VT_BTYPE
) == VT_PTR
||
2070 (dbt
& VT_BTYPE
) == VT_FUNC
) {
2071 if ((sbt
& VT_BTYPE
) != VT_LLONG
&&
2072 (sbt
& VT_BTYPE
) != VT_PTR
&&
2073 (sbt
& VT_BTYPE
) != VT_FUNC
) {
2074 /* need to convert from 32bit to 64bit */
2076 if (sbt
!= (VT_INT
| VT_UNSIGNED
)) {
2077 #if defined(TCC_TARGET_ARM64)
2079 #elif defined(TCC_TARGET_X86_64)
2081 /* x86_64 specific: movslq */
2083 o(0xc0 + (REG_VALUE(r
) << 3) + REG_VALUE(r
));
2090 } else if (dbt
== VT_BOOL
) {
2091 /* scalar to bool */
2094 } else if ((dbt
& VT_BTYPE
) == VT_BYTE
||
2095 (dbt
& VT_BTYPE
) == VT_SHORT
) {
2096 if (sbt
== VT_PTR
) {
2097 vtop
->type
.t
= VT_INT
;
2098 tcc_warning("nonportable conversion from pointer to char/short");
2100 force_charshort_cast(dbt
);
2101 } else if ((dbt
& VT_BTYPE
) == VT_INT
) {
2103 if (sbt
== VT_LLONG
) {
2104 /* from long long: just take low order word */
2108 /* if lvalue and single word type, nothing to do because
2109 the lvalue already contains the real type size (see
2110 VT_LVAL_xxx constants) */
2113 } else if ((dbt
& VT_BTYPE
) == VT_PTR
&& !(vtop
->r
& VT_LVAL
)) {
2114 /* if we are casting between pointer types,
2115 we must update the VT_LVAL_xxx size */
2116 vtop
->r
= (vtop
->r
& ~VT_LVAL_TYPE
)
2117 | (lvalue_type(type
->ref
->type
.t
) & VT_LVAL_TYPE
);
2122 /* return type size as known at compile time. Put alignment at 'a' */
2123 ST_FUNC
int type_size(CType
*type
, int *a
)
2128 bt
= type
->t
& VT_BTYPE
;
2129 if (bt
== VT_STRUCT
) {
2134 } else if (bt
== VT_PTR
) {
2135 if (type
->t
& VT_ARRAY
) {
2139 ts
= type_size(&s
->type
, a
);
2141 if (ts
< 0 && s
->c
< 0)
2149 } else if (bt
== VT_LDOUBLE
) {
2151 return LDOUBLE_SIZE
;
2152 } else if (bt
== VT_DOUBLE
|| bt
== VT_LLONG
) {
2153 #ifdef TCC_TARGET_I386
2154 #ifdef TCC_TARGET_PE
2159 #elif defined(TCC_TARGET_ARM)
2169 } else if (bt
== VT_INT
|| bt
== VT_ENUM
|| bt
== VT_FLOAT
) {
2172 } else if (bt
== VT_SHORT
) {
2175 } else if (bt
== VT_QLONG
|| bt
== VT_QFLOAT
) {
2179 /* char, void, function, _Bool */
2185 /* push type size as known at runtime time on top of value stack. Put
2187 ST_FUNC
void vla_runtime_type_size(CType
*type
, int *a
)
2189 if (type
->t
& VT_VLA
) {
2190 vset(&int_type
, VT_LOCAL
|VT_LVAL
, type
->ref
->c
);
2192 vpushi(type_size(type
, a
));
2196 static void vla_sp_save(void) {
2197 if (!(vla_flags
& VLA_SP_LOC_SET
)) {
2198 *vla_sp_loc
= (loc
-= PTR_SIZE
);
2199 vla_flags
|= VLA_SP_LOC_SET
;
2201 if (!(vla_flags
& VLA_SP_SAVED
)) {
2202 gen_vla_sp_save(*vla_sp_loc
);
2203 vla_flags
|= VLA_SP_SAVED
;
2207 /* return the pointed type of t */
2208 static inline CType
*pointed_type(CType
*type
)
2210 return &type
->ref
->type
;
2213 /* modify type so that its it is a pointer to type. */
2214 ST_FUNC
void mk_pointer(CType
*type
)
2217 s
= sym_push(SYM_FIELD
, type
, 0, -1);
2218 type
->t
= VT_PTR
| (type
->t
& ~VT_TYPE
);
2222 /* compare function types. OLD functions match any new functions */
2223 static int is_compatible_func(CType
*type1
, CType
*type2
)
2229 if (!is_compatible_types(&s1
->type
, &s2
->type
))
2231 /* check func_call */
2232 if (s1
->a
.func_call
!= s2
->a
.func_call
)
2234 /* XXX: not complete */
2235 if (s1
->c
== FUNC_OLD
|| s2
->c
== FUNC_OLD
)
2239 while (s1
!= NULL
) {
2242 if (!is_compatible_parameter_types(&s1
->type
, &s2
->type
))
2252 /* return true if type1 and type2 are the same. If unqualified is
2253 true, qualifiers on the types are ignored.
2255 - enums are not checked as gcc __builtin_types_compatible_p ()
2257 static int compare_types(CType
*type1
, CType
*type2
, int unqualified
)
2261 t1
= type1
->t
& VT_TYPE
;
2262 t2
= type2
->t
& VT_TYPE
;
2264 /* strip qualifiers before comparing */
2265 t1
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2266 t2
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2268 /* Default Vs explicit signedness only matters for char */
2269 if ((t1
& VT_BTYPE
) != VT_BYTE
) {
2273 /* XXX: bitfields ? */
2276 /* test more complicated cases */
2277 bt1
= t1
& VT_BTYPE
;
2278 if (bt1
== VT_PTR
) {
2279 type1
= pointed_type(type1
);
2280 type2
= pointed_type(type2
);
2281 return is_compatible_types(type1
, type2
);
2282 } else if (bt1
== VT_STRUCT
) {
2283 return (type1
->ref
== type2
->ref
);
2284 } else if (bt1
== VT_FUNC
) {
2285 return is_compatible_func(type1
, type2
);
2291 /* return true if type1 and type2 are exactly the same (including
2294 static int is_compatible_types(CType
*type1
, CType
*type2
)
2296 return compare_types(type1
,type2
,0);
2299 /* return true if type1 and type2 are the same (ignoring qualifiers).
2301 static int is_compatible_parameter_types(CType
*type1
, CType
*type2
)
2303 return compare_types(type1
,type2
,1);
2306 /* print a type. If 'varstr' is not NULL, then the variable is also
2307 printed in the type */
2309 /* XXX: add array and function pointers */
2310 static void type_to_str(char *buf
, int buf_size
,
2311 CType
*type
, const char *varstr
)
2318 t
= type
->t
& VT_TYPE
;
2321 if (t
& VT_CONSTANT
)
2322 pstrcat(buf
, buf_size
, "const ");
2323 if (t
& VT_VOLATILE
)
2324 pstrcat(buf
, buf_size
, "volatile ");
2325 if ((t
& (VT_DEFSIGN
| VT_UNSIGNED
)) == (VT_DEFSIGN
| VT_UNSIGNED
))
2326 pstrcat(buf
, buf_size
, "unsigned ");
2327 else if (t
& VT_DEFSIGN
)
2328 pstrcat(buf
, buf_size
, "signed ");
2358 tstr
= "long double";
2360 pstrcat(buf
, buf_size
, tstr
);
2364 if (bt
== VT_STRUCT
)
2368 pstrcat(buf
, buf_size
, tstr
);
2369 v
= type
->ref
->v
& ~SYM_STRUCT
;
2370 if (v
>= SYM_FIRST_ANOM
)
2371 pstrcat(buf
, buf_size
, "<anonymous>");
2373 pstrcat(buf
, buf_size
, get_tok_str(v
, NULL
));
2377 type_to_str(buf
, buf_size
, &s
->type
, varstr
);
2378 pstrcat(buf
, buf_size
, "(");
2380 while (sa
!= NULL
) {
2381 type_to_str(buf1
, sizeof(buf1
), &sa
->type
, NULL
);
2382 pstrcat(buf
, buf_size
, buf1
);
2385 pstrcat(buf
, buf_size
, ", ");
2387 pstrcat(buf
, buf_size
, ")");
2391 pstrcpy(buf1
, sizeof(buf1
), "*");
2393 pstrcat(buf1
, sizeof(buf1
), varstr
);
2394 type_to_str(buf
, buf_size
, &s
->type
, buf1
);
2398 pstrcat(buf
, buf_size
, " ");
2399 pstrcat(buf
, buf_size
, varstr
);
2404 /* verify type compatibility to store vtop in 'dt' type, and generate
2406 static void gen_assign_cast(CType
*dt
)
2408 CType
*st
, *type1
, *type2
, tmp_type1
, tmp_type2
;
2409 char buf1
[256], buf2
[256];
2412 st
= &vtop
->type
; /* source type */
2413 dbt
= dt
->t
& VT_BTYPE
;
2414 sbt
= st
->t
& VT_BTYPE
;
2415 if (sbt
== VT_VOID
|| dbt
== VT_VOID
)
2416 tcc_error("cannot cast from/to void");
2417 if (dt
->t
& VT_CONSTANT
)
2418 tcc_warning("assignment of read-only location");
2421 /* special cases for pointers */
2422 /* '0' can also be a pointer */
2423 if (is_null_pointer(vtop
))
2425 /* accept implicit pointer to integer cast with warning */
2426 if (is_integer_btype(sbt
)) {
2427 tcc_warning("assignment makes pointer from integer without a cast");
2430 type1
= pointed_type(dt
);
2431 /* a function is implicitely a function pointer */
2432 if (sbt
== VT_FUNC
) {
2433 if ((type1
->t
& VT_BTYPE
) != VT_VOID
&&
2434 !is_compatible_types(pointed_type(dt
), st
))
2435 tcc_warning("assignment from incompatible pointer type");
2440 type2
= pointed_type(st
);
2441 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
2442 (type2
->t
& VT_BTYPE
) == VT_VOID
) {
2443 /* void * can match anything */
2445 /* exact type match, except for unsigned */
2448 tmp_type1
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
|
2450 tmp_type2
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
|
2452 if (!is_compatible_types(&tmp_type1
, &tmp_type2
))
2453 tcc_warning("assignment from incompatible pointer type");
2455 /* check const and volatile */
2456 if ((!(type1
->t
& VT_CONSTANT
) && (type2
->t
& VT_CONSTANT
)) ||
2457 (!(type1
->t
& VT_VOLATILE
) && (type2
->t
& VT_VOLATILE
)))
2458 tcc_warning("assignment discards qualifiers from pointer target type");
2464 if (sbt
== VT_PTR
|| sbt
== VT_FUNC
) {
2465 tcc_warning("assignment makes integer from pointer without a cast");
2467 /* XXX: more tests */
2472 tmp_type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2473 tmp_type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2474 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
2476 type_to_str(buf1
, sizeof(buf1
), st
, NULL
);
2477 type_to_str(buf2
, sizeof(buf2
), dt
, NULL
);
2478 tcc_error("cannot cast '%s' to '%s'", buf1
, buf2
);
2486 /* store vtop in lvalue pushed on stack */
2487 ST_FUNC
void vstore(void)
2489 int sbt
, dbt
, ft
, r
, t
, size
, align
, bit_size
, bit_pos
, rc
, delayed_cast
;
2491 ft
= vtop
[-1].type
.t
;
2492 sbt
= vtop
->type
.t
& VT_BTYPE
;
2493 dbt
= ft
& VT_BTYPE
;
2494 if ((((sbt
== VT_INT
|| sbt
== VT_SHORT
) && dbt
== VT_BYTE
) ||
2495 (sbt
== VT_INT
&& dbt
== VT_SHORT
))
2496 && !(vtop
->type
.t
& VT_BITFIELD
)) {
2497 /* optimize char/short casts */
2498 delayed_cast
= VT_MUSTCAST
;
2499 vtop
->type
.t
= ft
& (VT_TYPE
& ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
)));
2500 /* XXX: factorize */
2501 if (ft
& VT_CONSTANT
)
2502 tcc_warning("assignment of read-only location");
2505 if (!(ft
& VT_BITFIELD
))
2506 gen_assign_cast(&vtop
[-1].type
);
2509 if (sbt
== VT_STRUCT
) {
2510 /* if structure, only generate pointer */
2511 /* structure assignment : generate memcpy */
2512 /* XXX: optimize if small size */
2513 if (!nocode_wanted
) {
2514 size
= type_size(&vtop
->type
, &align
);
2518 vtop
->type
.t
= VT_PTR
;
2521 /* address of memcpy() */
2524 vpush_global_sym(&func_old_type
, TOK_memcpy8
);
2525 else if(!(align
& 3))
2526 vpush_global_sym(&func_old_type
, TOK_memcpy4
);
2529 vpush_global_sym(&func_old_type
, TOK_memcpy
);
2534 vtop
->type
.t
= VT_PTR
;
2543 /* leave source on stack */
2544 } else if (ft
& VT_BITFIELD
) {
2545 /* bitfield store handling */
2547 /* save lvalue as expression result (example: s.b = s.a = n;) */
2548 vdup(), vtop
[-1] = vtop
[-2];
2550 bit_pos
= (ft
>> VT_STRUCT_SHIFT
) & 0x3f;
2551 bit_size
= (ft
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
2552 /* remove bit field info to avoid loops */
2553 vtop
[-1].type
.t
= ft
& ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
));
2555 if((ft
& VT_BTYPE
) == VT_BOOL
) {
2556 gen_cast(&vtop
[-1].type
);
2557 vtop
[-1].type
.t
= (vtop
[-1].type
.t
& ~VT_BTYPE
) | (VT_BYTE
| VT_UNSIGNED
);
2560 /* duplicate destination */
2562 vtop
[-1] = vtop
[-2];
2564 /* mask and shift source */
2565 if((ft
& VT_BTYPE
) != VT_BOOL
) {
2566 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2567 vpushll((1ULL << bit_size
) - 1ULL);
2569 vpushi((1 << bit_size
) - 1);
2575 /* load destination, mask and or with source */
2577 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2578 vpushll(~(((1ULL << bit_size
) - 1ULL) << bit_pos
));
2580 vpushi(~(((1 << bit_size
) - 1) << bit_pos
));
2586 /* ... and discard */
2590 #ifdef CONFIG_TCC_BCHECK
2591 /* bound check case */
2592 if (vtop
[-1].r
& VT_MUSTBOUND
) {
2598 if (!nocode_wanted
) {
2602 #ifdef TCC_TARGET_X86_64
2603 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
2605 } else if ((ft
& VT_BTYPE
) == VT_QFLOAT
) {
2610 r
= gv(rc
); /* generate value */
2611 /* if lvalue was saved on stack, must read it */
2612 if ((vtop
[-1].r
& VT_VALMASK
) == VT_LLOCAL
) {
2614 t
= get_reg(RC_INT
);
2615 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2620 sv
.r
= VT_LOCAL
| VT_LVAL
;
2621 sv
.c
.ul
= vtop
[-1].c
.ul
;
2623 vtop
[-1].r
= t
| VT_LVAL
;
2625 /* two word case handling : store second register at word + 4 (or +8 for x86-64) */
2626 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2627 if (((ft
& VT_BTYPE
) == VT_QLONG
) || ((ft
& VT_BTYPE
) == VT_QFLOAT
)) {
2628 int addr_type
= VT_LLONG
, load_size
= 8, load_type
= ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) ? VT_LLONG
: VT_DOUBLE
;
2630 if ((ft
& VT_BTYPE
) == VT_LLONG
) {
2631 int addr_type
= VT_INT
, load_size
= 4, load_type
= VT_INT
;
2633 vtop
[-1].type
.t
= load_type
;
2636 /* convert to int to increment easily */
2637 vtop
->type
.t
= addr_type
;
2643 vtop
[-1].type
.t
= load_type
;
2644 /* XXX: it works because r2 is spilled last ! */
2645 store(vtop
->r2
, vtop
- 1);
2651 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
2652 vtop
->r
|= delayed_cast
;
2656 /* post defines POST/PRE add. c is the token ++ or -- */
2657 ST_FUNC
void inc(int post
, int c
)
2660 vdup(); /* save lvalue */
2662 gv_dup(); /* duplicate value */
2667 vpushi(c
- TOK_MID
);
2669 vstore(); /* store value */
2671 vpop(); /* if post op, return saved value */
2674 /* Parse GNUC __attribute__ extension. Currently, the following
2675 extensions are recognized:
2676 - aligned(n) : set data/function alignment.
2677 - packed : force data alignment to 1
2678 - section(x) : generate data/code in this section.
2679 - unused : currently ignored, but may be used someday.
2680 - regparm(n) : pass function parameters in registers (i386 only)
2682 static void parse_attribute(AttributeDef
*ad
)
2686 while (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
) {
2690 while (tok
!= ')') {
2691 if (tok
< TOK_IDENT
)
2692 expect("attribute name");
2700 expect("section name");
2701 ad
->section
= find_section(tcc_state
, (char *)tokc
.cstr
->data
);
2709 expect("alias(\"target\")");
2710 ad
->alias_target
= /* save string as token, for later */
2711 tok_alloc((char*)tokc
.cstr
->data
, tokc
.cstr
->size
-1)->tok
;
2715 case TOK_VISIBILITY1
:
2716 case TOK_VISIBILITY2
:
2719 expect("visibility(\"default|hidden|internal|protected\")");
2720 if (!strcmp (tokc
.cstr
->data
, "default"))
2721 ad
->a
.visibility
= STV_DEFAULT
;
2722 else if (!strcmp (tokc
.cstr
->data
, "hidden"))
2723 ad
->a
.visibility
= STV_HIDDEN
;
2724 else if (!strcmp (tokc
.cstr
->data
, "internal"))
2725 ad
->a
.visibility
= STV_INTERNAL
;
2726 else if (!strcmp (tokc
.cstr
->data
, "protected"))
2727 ad
->a
.visibility
= STV_PROTECTED
;
2729 expect("visibility(\"default|hidden|internal|protected\")");
2738 if (n
<= 0 || (n
& (n
- 1)) != 0)
2739 tcc_error("alignment must be a positive power of two");
2756 /* currently, no need to handle it because tcc does not
2757 track unused objects */
2761 /* currently, no need to handle it because tcc does not
2762 track unused objects */
2767 ad
->a
.func_call
= FUNC_CDECL
;
2772 ad
->a
.func_call
= FUNC_STDCALL
;
2774 #ifdef TCC_TARGET_I386
2784 ad
->a
.func_call
= FUNC_FASTCALL1
+ n
- 1;
2790 ad
->a
.func_call
= FUNC_FASTCALLW
;
2797 ad
->a
.mode
= VT_LLONG
+ 1;
2800 ad
->a
.mode
= VT_SHORT
+ 1;
2803 ad
->a
.mode
= VT_INT
+ 1;
2806 tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok
, NULL
));
2813 ad
->a
.func_export
= 1;
2816 ad
->a
.func_import
= 1;
2819 if (tcc_state
->warn_unsupported
)
2820 tcc_warning("'%s' attribute ignored", get_tok_str(t
, NULL
));
2821 /* skip parameters */
2823 int parenthesis
= 0;
2827 else if (tok
== ')')
2830 } while (parenthesis
&& tok
!= -1);
2843 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
2844 static void struct_decl(CType
*type
, int u
, int tdef
)
2846 int a
, v
, size
, align
, maxalign
, c
, offset
, flexible
;
2847 int bit_size
, bit_pos
, bsize
, bt
, lbit_pos
, prevbt
;
2848 Sym
*s
, *ss
, *ass
, **ps
;
2852 a
= tok
; /* save decl type */
2857 /* struct already defined ? return it */
2859 expect("struct/union/enum name");
2863 tcc_error("invalid type");
2865 } else if (tok
>= TOK_IDENT
&& !tdef
)
2866 tcc_error("unknown struct/union/enum");
2872 /* we put an undefined size for struct/union */
2873 s
= sym_push(v
| SYM_STRUCT
, &type1
, 0, -1);
2874 s
->r
= 0; /* default alignment is zero as gcc */
2875 /* put struct/union/enum name in type */
2883 tcc_error("struct/union/enum already defined");
2884 /* cannot be empty */
2886 /* non empty enums are not allowed */
2887 if (a
== TOK_ENUM
) {
2891 expect("identifier");
2893 if (ss
&& !local_stack
)
2894 tcc_error("redefinition of enumerator '%s'",
2895 get_tok_str(v
, NULL
));
2901 /* enum symbols have static storage */
2902 ss
= sym_push(v
, &int_type
, VT_CONST
, c
);
2903 ss
->type
.t
|= VT_STATIC
;
2908 /* NOTE: we accept a trailing comma */
2912 s
->c
= type_size(&int_type
, &align
);
2921 while (tok
!= '}') {
2922 parse_btype(&btype
, &ad
);
2925 tcc_error("flexible array member '%s' not at the end of struct",
2926 get_tok_str(v
, NULL
));
2931 type_decl(&type1
, &ad
, &v
, TYPE_DIRECT
| TYPE_ABSTRACT
);
2932 if (v
== 0 && (type1
.t
& VT_BTYPE
) != VT_STRUCT
)
2933 expect("identifier");
2934 if (type_size(&type1
, &align
) < 0) {
2935 if ((a
== TOK_STRUCT
) && (type1
.t
& VT_ARRAY
) && c
)
2938 tcc_error("field '%s' has incomplete type",
2939 get_tok_str(v
, NULL
));
2941 if ((type1
.t
& VT_BTYPE
) == VT_FUNC
||
2942 (type1
.t
& (VT_TYPEDEF
| VT_STATIC
| VT_EXTERN
| VT_INLINE
)))
2943 tcc_error("invalid type for '%s'",
2944 get_tok_str(v
, NULL
));
2948 bit_size
= expr_const();
2949 /* XXX: handle v = 0 case for messages */
2951 tcc_error("negative width in bit-field '%s'",
2952 get_tok_str(v
, NULL
));
2953 if (v
&& bit_size
== 0)
2954 tcc_error("zero width for bit-field '%s'",
2955 get_tok_str(v
, NULL
));
2957 size
= type_size(&type1
, &align
);
2959 if (align
< ad
.a
.aligned
)
2960 align
= ad
.a
.aligned
;
2961 } else if (ad
.a
.packed
) {
2963 } else if (*tcc_state
->pack_stack_ptr
) {
2964 if (align
> *tcc_state
->pack_stack_ptr
)
2965 align
= *tcc_state
->pack_stack_ptr
;
2968 if (bit_size
>= 0) {
2969 bt
= type1
.t
& VT_BTYPE
;
2976 tcc_error("bitfields must have scalar type");
2978 if (bit_size
> bsize
) {
2979 tcc_error("width of '%s' exceeds its type",
2980 get_tok_str(v
, NULL
));
2981 } else if (bit_size
== bsize
) {
2982 /* no need for bit fields */
2984 } else if (bit_size
== 0) {
2985 /* XXX: what to do if only padding in a
2987 /* zero size: means to pad */
2990 /* we do not have enough room ?
2991 did the type change?
2993 if ((bit_pos
+ bit_size
) > bsize
||
2994 bt
!= prevbt
|| a
== TOK_UNION
)
2997 /* XXX: handle LSB first */
2998 type1
.t
|= VT_BITFIELD
|
2999 (bit_pos
<< VT_STRUCT_SHIFT
) |
3000 (bit_size
<< (VT_STRUCT_SHIFT
+ 6));
3001 bit_pos
+= bit_size
;
3007 if (v
!= 0 || (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
3008 /* add new memory data only if starting
3010 if (lbit_pos
== 0) {
3011 if (a
== TOK_STRUCT
) {
3012 c
= (c
+ align
- 1) & -align
;
3021 if (align
> maxalign
)
3025 printf("add field %s offset=%d",
3026 get_tok_str(v
, NULL
), offset
);
3027 if (type1
.t
& VT_BITFIELD
) {
3028 printf(" pos=%d size=%d",
3029 (type1
.t
>> VT_STRUCT_SHIFT
) & 0x3f,
3030 (type1
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f);
3035 if (v
== 0 && (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
3037 while ((ass
= ass
->next
) != NULL
) {
3038 ss
= sym_push(ass
->v
, &ass
->type
, 0, offset
+ ass
->c
);
3043 ss
= sym_push(v
| SYM_FIELD
, &type1
, 0, offset
);
3047 if (tok
== ';' || tok
== TOK_EOF
)
3054 /* store size and alignment */
3055 s
->c
= (c
+ maxalign
- 1) & -maxalign
;
3061 /* return 1 if basic type is a type size (short, long, long long) */
3062 ST_FUNC
int is_btype_size(int bt
)
3064 return bt
== VT_SHORT
|| bt
== VT_LONG
|| bt
== VT_LLONG
;
3067 /* return 0 if no type declaration. otherwise, return the basic type
3070 static int parse_btype(CType
*type
, AttributeDef
*ad
)
3072 int t
, u
, bt_size
, complete
, type_found
, typespec_found
;
3076 memset(ad
, 0, sizeof(AttributeDef
));
3084 /* currently, we really ignore extension */
3095 tcc_error("too many basic types");
3097 bt_size
= is_btype_size (u
& VT_BTYPE
);
3098 if (u
== VT_INT
|| (!bt_size
&& !(t
& VT_TYPEDEF
)))
3113 if ((t
& VT_BTYPE
) == VT_DOUBLE
) {
3114 #ifndef TCC_TARGET_PE
3115 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3117 } else if ((t
& VT_BTYPE
) == VT_LONG
) {
3118 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3124 #ifdef TCC_TARGET_ARM64
3126 /* GCC's __uint128_t appears in some Linux header files. Make it a
3127 synonym for long double to get the size and alignment right. */
3139 if ((t
& VT_BTYPE
) == VT_LONG
) {
3140 #ifdef TCC_TARGET_PE
3141 t
= (t
& ~VT_BTYPE
) | VT_DOUBLE
;
3143 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3151 struct_decl(&type1
, VT_ENUM
, t
& (VT_TYPEDEF
| VT_EXTERN
));
3154 type
->ref
= type1
.ref
;
3158 struct_decl(&type1
, VT_STRUCT
, t
& (VT_TYPEDEF
| VT_EXTERN
));
3161 /* type modifiers */
3177 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == (VT_DEFSIGN
|VT_UNSIGNED
))
3178 tcc_error("signed and unsigned modifier");
3191 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == VT_DEFSIGN
)
3192 tcc_error("signed and unsigned modifier");
3193 t
|= VT_DEFSIGN
| VT_UNSIGNED
;
3218 /* GNUC attribute */
3219 case TOK_ATTRIBUTE1
:
3220 case TOK_ATTRIBUTE2
:
3221 parse_attribute(ad
);
3224 t
= (t
& ~VT_BTYPE
) | u
;
3232 parse_expr_type(&type1
);
3233 /* remove all storage modifiers except typedef */
3234 type1
.t
&= ~(VT_STORAGE
&~VT_TYPEDEF
);
3240 if (!s
|| !(s
->type
.t
& VT_TYPEDEF
))
3242 t
|= (s
->type
.t
& ~VT_TYPEDEF
);
3243 type
->ref
= s
->type
.ref
;
3245 /* get attributes from typedef */
3246 if (0 == ad
->a
.aligned
)
3247 ad
->a
.aligned
= s
->a
.aligned
;
3248 if (0 == ad
->a
.func_call
)
3249 ad
->a
.func_call
= s
->a
.func_call
;
3250 ad
->a
.packed
|= s
->a
.packed
;
3259 if (tcc_state
->char_is_unsigned
) {
3260 if ((t
& (VT_DEFSIGN
|VT_BTYPE
)) == VT_BYTE
)
3264 /* long is never used as type */
3265 if ((t
& VT_BTYPE
) == VT_LONG
)
3266 #if (!defined TCC_TARGET_X86_64 && !defined TCC_TARGET_ARM64) || \
3267 defined TCC_TARGET_PE
3268 t
= (t
& ~VT_BTYPE
) | VT_INT
;
3270 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3276 /* convert a function parameter type (array to pointer and function to
3277 function pointer) */
3278 static inline void convert_parameter_type(CType
*pt
)
3280 /* remove const and volatile qualifiers (XXX: const could be used
3281 to indicate a const function parameter */
3282 pt
->t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3283 /* array must be transformed to pointer according to ANSI C */
3285 if ((pt
->t
& VT_BTYPE
) == VT_FUNC
) {
3290 ST_FUNC
void parse_asm_str(CString
*astr
)
3293 /* read the string */
3295 expect("string constant");
3297 while (tok
== TOK_STR
) {
3298 /* XXX: add \0 handling too ? */
3299 cstr_cat(astr
, tokc
.cstr
->data
);
3302 cstr_ccat(astr
, '\0');
3305 /* Parse an asm label and return the label
3306 * Don't forget to free the CString in the caller! */
3307 static void asm_label_instr(CString
*astr
)
3310 parse_asm_str(astr
);
3313 printf("asm_alias: \"%s\"\n", (char *)astr
->data
);
3317 static void post_type(CType
*type
, AttributeDef
*ad
)
3319 int n
, l
, t1
, arg_size
, align
;
3320 Sym
**plast
, *s
, *first
;
3325 /* function declaration */
3333 /* read param name and compute offset */
3334 if (l
!= FUNC_OLD
) {
3335 if (!parse_btype(&pt
, &ad1
)) {
3337 tcc_error("invalid type");
3344 if ((pt
.t
& VT_BTYPE
) == VT_VOID
&& tok
== ')')
3346 type_decl(&pt
, &ad1
, &n
, TYPE_DIRECT
| TYPE_ABSTRACT
);
3347 if ((pt
.t
& VT_BTYPE
) == VT_VOID
)
3348 tcc_error("parameter declared as void");
3349 arg_size
+= (type_size(&pt
, &align
) + PTR_SIZE
- 1) / PTR_SIZE
;
3354 expect("identifier");
3358 convert_parameter_type(&pt
);
3359 s
= sym_push(n
| SYM_FIELD
, &pt
, 0, 0);
3365 if (l
== FUNC_NEW
&& tok
== TOK_DOTS
) {
3372 /* if no parameters, then old type prototype */
3376 /* NOTE: const is ignored in returned type as it has a special
3377 meaning in gcc / C++ */
3378 type
->t
&= ~VT_CONSTANT
;
3379 /* some ancient pre-K&R C allows a function to return an array
3380 and the array brackets to be put after the arguments, such
3381 that "int c()[]" means something like "int[] c()" */
3384 skip(']'); /* only handle simple "[]" */
3387 /* we push a anonymous symbol which will contain the function prototype */
3388 ad
->a
.func_args
= arg_size
;
3389 s
= sym_push(SYM_FIELD
, type
, 0, l
);
3394 } else if (tok
== '[') {
3395 /* array definition */
3397 if (tok
== TOK_RESTRICT1
)
3402 if (!local_stack
|| nocode_wanted
)
3403 vpushi(expr_const());
3405 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3408 tcc_error("invalid array size");
3410 if (!is_integer_btype(vtop
->type
.t
& VT_BTYPE
))
3411 tcc_error("size of variable length array should be an integer");
3416 /* parse next post type */
3417 post_type(type
, ad
);
3418 if (type
->t
== VT_FUNC
)
3419 tcc_error("declaration of an array of functions");
3420 t1
|= type
->t
& VT_VLA
;
3423 loc
-= type_size(&int_type
, &align
);
3427 vla_runtime_type_size(type
, &align
);
3429 vset(&int_type
, VT_LOCAL
|VT_LVAL
, loc
);
3436 /* we push an anonymous symbol which will contain the array
3438 s
= sym_push(SYM_FIELD
, type
, 0, n
);
3439 type
->t
= (t1
? VT_VLA
: VT_ARRAY
) | VT_PTR
;
3444 /* Parse a type declaration (except basic type), and return the type
3445 in 'type'. 'td' is a bitmask indicating which kind of type decl is
3446 expected. 'type' should contain the basic type. 'ad' is the
3447 attribute definition of the basic type. It can be modified by
3450 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
)
3453 CType type1
, *type2
;
3454 int qualifiers
, storage
;
3456 while (tok
== '*') {
3464 qualifiers
|= VT_CONSTANT
;
3469 qualifiers
|= VT_VOLATILE
;
3477 type
->t
|= qualifiers
;
3480 /* XXX: clarify attribute handling */
3481 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3482 parse_attribute(ad
);
3484 /* recursive type */
3485 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
3486 type1
.t
= 0; /* XXX: same as int */
3489 /* XXX: this is not correct to modify 'ad' at this point, but
3490 the syntax is not clear */
3491 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3492 parse_attribute(ad
);
3493 type_decl(&type1
, ad
, v
, td
);
3496 /* type identifier */
3497 if (tok
>= TOK_IDENT
&& (td
& TYPE_DIRECT
)) {
3501 if (!(td
& TYPE_ABSTRACT
))
3502 expect("identifier");
3506 storage
= type
->t
& VT_STORAGE
;
3507 type
->t
&= ~VT_STORAGE
;
3508 if (storage
& VT_STATIC
) {
3509 int saved_nocode_wanted
= nocode_wanted
;
3511 post_type(type
, ad
);
3512 nocode_wanted
= saved_nocode_wanted
;
3514 post_type(type
, ad
);
3516 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3517 parse_attribute(ad
);
3521 /* append type at the end of type1 */
3534 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
3535 ST_FUNC
int lvalue_type(int t
)
3540 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
3542 else if (bt
== VT_SHORT
)
3546 if (t
& VT_UNSIGNED
)
3547 r
|= VT_LVAL_UNSIGNED
;
3551 /* indirection with full error checking and bound check */
3552 ST_FUNC
void indir(void)
3554 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
) {
3555 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FUNC
)
3559 if ((vtop
->r
& VT_LVAL
) && !nocode_wanted
)
3561 vtop
->type
= *pointed_type(&vtop
->type
);
3562 /* Arrays and functions are never lvalues */
3563 if (!(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_VLA
)
3564 && (vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
3565 vtop
->r
|= lvalue_type(vtop
->type
.t
);
3566 /* if bound checking, the referenced pointer must be checked */
3567 #ifdef CONFIG_TCC_BCHECK
3568 if (tcc_state
->do_bounds_check
)
3569 vtop
->r
|= VT_MUSTBOUND
;
3574 /* pass a parameter to a function and do type checking and casting */
3575 static void gfunc_param_typed(Sym
*func
, Sym
*arg
)
3580 func_type
= func
->c
;
3581 if (func_type
== FUNC_OLD
||
3582 (func_type
== FUNC_ELLIPSIS
&& arg
== NULL
)) {
3583 /* default casting : only need to convert float to double */
3584 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
) {
3587 } else if (vtop
->type
.t
& VT_BITFIELD
) {
3588 type
.t
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
3591 } else if (arg
== NULL
) {
3592 tcc_error("too many arguments to function");
3595 type
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
3596 gen_assign_cast(&type
);
3600 /* parse an expression of the form '(type)' or '(expr)' and return its
3602 static void parse_expr_type(CType
*type
)
3608 if (parse_btype(type
, &ad
)) {
3609 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3616 static void parse_type(CType
*type
)
3621 if (!parse_btype(type
, &ad
)) {
3624 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3627 static void vpush_tokc(int t
)
3632 vsetc(&type
, VT_CONST
, &tokc
);
3635 ST_FUNC
void unary(void)
3637 int n
, t
, align
, size
, r
, sizeof_caller
;
3641 static int in_sizeof
= 0;
3643 sizeof_caller
= in_sizeof
;
3645 /* XXX: GCC 2.95.3 does not generate a table although it should be
3659 vpush_tokc(VT_INT
| VT_UNSIGNED
);
3663 vpush_tokc(VT_LLONG
);
3667 vpush_tokc(VT_LLONG
| VT_UNSIGNED
);
3671 vpush_tokc(VT_FLOAT
);
3675 vpush_tokc(VT_DOUBLE
);
3679 vpush_tokc(VT_LDOUBLE
);
3682 case TOK___FUNCTION__
:
3684 goto tok_identifier
;
3690 /* special function name identifier */
3691 len
= strlen(funcname
) + 1;
3692 /* generate char[len] type */
3697 vpush_ref(&type
, data_section
, data_section
->data_offset
, len
);
3698 ptr
= section_ptr_add(data_section
, len
);
3699 memcpy(ptr
, funcname
, len
);
3704 #ifdef TCC_TARGET_PE
3705 t
= VT_SHORT
| VT_UNSIGNED
;
3711 /* string parsing */
3714 if (tcc_state
->warn_write_strings
)
3719 memset(&ad
, 0, sizeof(AttributeDef
));
3720 decl_initializer_alloc(&type
, &ad
, VT_CONST
, 2, 0, NULL
, 0);
3725 if (parse_btype(&type
, &ad
)) {
3726 type_decl(&type
, &ad
, &n
, TYPE_ABSTRACT
);
3728 /* check ISOC99 compound literal */
3730 /* data is allocated locally by default */
3735 /* all except arrays are lvalues */
3736 if (!(type
.t
& VT_ARRAY
))
3737 r
|= lvalue_type(type
.t
);
3738 memset(&ad
, 0, sizeof(AttributeDef
));
3739 decl_initializer_alloc(&type
, &ad
, r
, 1, 0, NULL
, 0);
3741 if (sizeof_caller
) {
3748 } else if (tok
== '{') {
3749 /* save all registers */
3751 /* statement expression : we do not accept break/continue
3752 inside as GCC does */
3753 block(NULL
, NULL
, NULL
, NULL
, 0, 1);
3768 /* functions names must be treated as function pointers,
3769 except for unary '&' and sizeof. Since we consider that
3770 functions are not lvalues, we only have to handle it
3771 there and in function calls. */
3772 /* arrays can also be used although they are not lvalues */
3773 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
&&
3774 !(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_LLOCAL
))
3776 mk_pointer(&vtop
->type
);
3782 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3784 boolean
.t
= VT_BOOL
;
3786 vtop
->c
.i
= !vtop
->c
.i
;
3787 } else if ((vtop
->r
& VT_VALMASK
) == VT_CMP
)
3788 vtop
->c
.i
= vtop
->c
.i
^ 1;
3791 vseti(VT_JMP
, gvtst(1, 0));
3803 if ((vtop
->type
.t
& VT_BTYPE
) == VT_PTR
)
3804 tcc_error("pointer not accepted for unary plus");
3805 /* In order to force cast, we add zero, except for floating point
3806 where we really need an noop (otherwise -0.0 will be transformed
3808 if (!is_float(vtop
->type
.t
)) {
3819 unary_type(&type
); // Perform a in_sizeof = 0;
3820 size
= type_size(&type
, &align
);
3821 if (t
== TOK_SIZEOF
) {
3822 if (!(type
.t
& VT_VLA
)) {
3824 tcc_error("sizeof applied to an incomplete type");
3827 vla_runtime_type_size(&type
, &align
);
3832 vtop
->type
.t
|= VT_UNSIGNED
;
3835 case TOK_builtin_types_compatible_p
:
3844 type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3845 type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3846 vpushi(is_compatible_types(&type1
, &type2
));
3849 case TOK_builtin_constant_p
:
3851 int saved_nocode_wanted
, res
;
3854 saved_nocode_wanted
= nocode_wanted
;
3857 res
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
3859 nocode_wanted
= saved_nocode_wanted
;
3864 case TOK_builtin_frame_address
:
3870 if (tok
!= TOK_CINT
|| tokc
.i
< 0) {
3871 tcc_error("__builtin_frame_address only takes positive integers");
3878 vset(&type
, VT_LOCAL
, 0); /* local frame */
3880 mk_pointer(&vtop
->type
);
3881 indir(); /* -> parent frame */
3885 #ifdef TCC_TARGET_X86_64
3886 #ifdef TCC_TARGET_PE
3887 case TOK_builtin_va_start
:
3895 if ((vtop
->r
& VT_VALMASK
) != VT_LOCAL
)
3896 tcc_error("__builtin_va_start expects a local variable");
3897 vtop
->r
&= ~(VT_LVAL
| VT_REF
);
3898 vtop
->type
= char_pointer_type
;
3903 case TOK_builtin_va_arg_types
:
3910 vpushi(classify_x86_64_va_arg(&type
));
3916 #ifdef TCC_TARGET_ARM64
3917 case TOK___va_start
: {
3927 vtop
->type
.t
= VT_VOID
;
3930 case TOK___va_arg
: {
3955 t
= vtop
->type
.t
& VT_BTYPE
;
3957 /* In IEEE negate(x) isn't subtract(0,x), but rather
3962 else if (t
== VT_DOUBLE
)
3973 goto tok_identifier
;
3975 /* allow to take the address of a label */
3976 if (tok
< TOK_UIDENT
)
3977 expect("label identifier");
3978 s
= label_find(tok
);
3980 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
3982 if (s
->r
== LABEL_DECLARED
)
3983 s
->r
= LABEL_FORWARD
;
3986 s
->type
.t
= VT_VOID
;
3987 mk_pointer(&s
->type
);
3988 s
->type
.t
|= VT_STATIC
;
3990 vpushsym(&s
->type
, s
);
3994 // special qnan , snan and infinity values
3996 vpush64(VT_DOUBLE
, 0x7ff8000000000000ULL
);
4000 vpush64(VT_DOUBLE
, 0x7ff0000000000001ULL
);
4004 vpush64(VT_DOUBLE
, 0x7ff0000000000000ULL
);
4013 expect("identifier");
4016 const char *name
= get_tok_str(t
, NULL
);
4018 tcc_error("'%s' undeclared", name
);
4019 /* for simple function calls, we tolerate undeclared
4020 external reference to int() function */
4021 if (tcc_state
->warn_implicit_function_declaration
4022 #ifdef TCC_TARGET_PE
4023 /* people must be warned about using undeclared WINAPI functions
4024 (which usually start with uppercase letter) */
4025 || (name
[0] >= 'A' && name
[0] <= 'Z')
4028 tcc_warning("implicit declaration of function '%s'", name
);
4029 s
= external_global_sym(t
, &func_old_type
, 0);
4031 if ((s
->type
.t
& (VT_STATIC
| VT_INLINE
| VT_BTYPE
)) ==
4032 (VT_STATIC
| VT_INLINE
| VT_FUNC
)) {
4033 /* if referencing an inline function, then we generate a
4034 symbol to it if not already done. It will have the
4035 effect to generate code for it at the end of the
4036 compilation unit. Inline function as always
4037 generated in the text section. */
4039 put_extern_sym(s
, text_section
, 0, 0);
4040 r
= VT_SYM
| VT_CONST
;
4044 vset(&s
->type
, r
, s
->c
);
4045 /* if forward reference, we must point to s */
4046 if (vtop
->r
& VT_SYM
) {
4048 vtop
->c
.ptr_offset
= 0;
4053 /* post operations */
4055 if (tok
== TOK_INC
|| tok
== TOK_DEC
) {
4058 } else if (tok
== '.' || tok
== TOK_ARROW
) {
4061 if (tok
== TOK_ARROW
)
4063 qualifiers
= vtop
->type
.t
& (VT_CONSTANT
| VT_VOLATILE
);
4067 /* expect pointer on structure */
4068 if ((vtop
->type
.t
& VT_BTYPE
) != VT_STRUCT
)
4069 expect("struct or union");
4073 while ((s
= s
->next
) != NULL
) {
4078 tcc_error("field not found: %s", get_tok_str(tok
& ~SYM_FIELD
, NULL
));
4079 /* add field offset to pointer */
4080 vtop
->type
= char_pointer_type
; /* change type to 'char *' */
4083 /* change type to field type, and set to lvalue */
4084 vtop
->type
= s
->type
;
4085 vtop
->type
.t
|= qualifiers
;
4086 /* an array is never an lvalue */
4087 if (!(vtop
->type
.t
& VT_ARRAY
)) {
4088 vtop
->r
|= lvalue_type(vtop
->type
.t
);
4089 #ifdef CONFIG_TCC_BCHECK
4090 /* if bound checking, the referenced pointer must be checked */
4091 if (tcc_state
->do_bounds_check
)
4092 vtop
->r
|= VT_MUSTBOUND
;
4096 } else if (tok
== '[') {
4102 } else if (tok
== '(') {
4105 int nb_args
, ret_nregs
, ret_align
, variadic
;
4108 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
4109 /* pointer test (no array accepted) */
4110 if ((vtop
->type
.t
& (VT_BTYPE
| VT_ARRAY
)) == VT_PTR
) {
4111 vtop
->type
= *pointed_type(&vtop
->type
);
4112 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
)
4116 expect("function pointer");
4119 vtop
->r
&= ~VT_LVAL
; /* no lvalue */
4121 /* get return type */
4124 sa
= s
->next
; /* first parameter */
4127 /* compute first implicit argument if a structure is returned */
4128 if ((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
4129 variadic
= (s
->c
== FUNC_ELLIPSIS
);
4130 ret_nregs
= gfunc_sret(&s
->type
, variadic
, &ret
.type
,
4133 /* get some space for the returned structure */
4134 size
= type_size(&s
->type
, &align
);
4135 #ifdef TCC_TARGET_ARM64
4136 /* On arm64, a small struct is return in registers.
4137 It is much easier to write it to memory if we know
4138 that we are allowed to write some extra bytes, so
4139 round the allocated space up to a power of 2: */
4141 while (size
& (size
- 1))
4142 size
= (size
| (size
- 1)) + 1;
4144 loc
= (loc
- size
) & -align
;
4146 ret
.r
= VT_LOCAL
| VT_LVAL
;
4147 /* pass it as 'int' to avoid structure arg passing
4149 vseti(VT_LOCAL
, loc
);
4159 /* return in register */
4160 if (is_float(ret
.type
.t
)) {
4161 ret
.r
= reg_fret(ret
.type
.t
);
4162 #ifdef TCC_TARGET_X86_64
4163 if ((ret
.type
.t
& VT_BTYPE
) == VT_QFLOAT
)
4167 #ifndef TCC_TARGET_ARM64
4168 #ifdef TCC_TARGET_X86_64
4169 if ((ret
.type
.t
& VT_BTYPE
) == VT_QLONG
)
4171 if ((ret
.type
.t
& VT_BTYPE
) == VT_LLONG
)
4182 gfunc_param_typed(s
, sa
);
4192 tcc_error("too few arguments to function");
4194 if (!nocode_wanted
) {
4195 gfunc_call(nb_args
);
4197 vtop
-= (nb_args
+ 1);
4201 for (r
= ret
.r
+ ret_nregs
+ !ret_nregs
; r
-- > ret
.r
;) {
4202 vsetc(&ret
.type
, r
, &ret
.c
);
4203 vtop
->r2
= ret
.r2
; /* Loop only happens when r2 is VT_CONST */
4206 /* handle packed struct return */
4207 if (((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) && ret_nregs
) {
4210 size
= type_size(&s
->type
, &align
);
4211 loc
= (loc
- size
) & -align
;
4215 vset(&ret
.type
, VT_LOCAL
| VT_LVAL
, addr
+ offset
);
4219 if (--ret_nregs
== 0)
4221 /* XXX: compatible with arm only: ret_align == register_size */
4222 offset
+= ret_align
;
4224 vset(&s
->type
, VT_LOCAL
| VT_LVAL
, addr
);
4232 ST_FUNC
void expr_prod(void)
4237 while (tok
== '*' || tok
== '/' || tok
== '%') {
4245 ST_FUNC
void expr_sum(void)
4250 while (tok
== '+' || tok
== '-') {
4258 static void expr_shift(void)
4263 while (tok
== TOK_SHL
|| tok
== TOK_SAR
) {
4271 static void expr_cmp(void)
4276 while ((tok
>= TOK_ULE
&& tok
<= TOK_GT
) ||
4277 tok
== TOK_ULT
|| tok
== TOK_UGE
) {
4285 static void expr_cmpeq(void)
4290 while (tok
== TOK_EQ
|| tok
== TOK_NE
) {
4298 static void expr_and(void)
4301 while (tok
== '&') {
4308 static void expr_xor(void)
4311 while (tok
== '^') {
4318 static void expr_or(void)
4321 while (tok
== '|') {
4328 /* XXX: fix this mess */
4329 static void expr_land_const(void)
4332 while (tok
== TOK_LAND
) {
4339 /* XXX: fix this mess */
4340 static void expr_lor_const(void)
4343 while (tok
== TOK_LOR
) {
4350 /* only used if non constant */
4351 static void expr_land(void)
4356 if (tok
== TOK_LAND
) {
4361 if (tok
!= TOK_LAND
) {
4371 static void expr_lor(void)
4376 if (tok
== TOK_LOR
) {
4381 if (tok
!= TOK_LOR
) {
4391 /* XXX: better constant handling */
4392 static void expr_cond(void)
4394 int tt
, u
, r1
, r2
, rc
, t1
, t2
, bt1
, bt2
;
4396 CType type
, type1
, type2
;
4403 boolean
.t
= VT_BOOL
;
4409 if (tok
!= ':' || !gnu_ext
) {
4424 if (vtop
!= vstack
) {
4425 /* needed to avoid having different registers saved in
4427 if (is_float(vtop
->type
.t
)) {
4429 #ifdef TCC_TARGET_X86_64
4430 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4440 if (tok
== ':' && gnu_ext
) {
4448 sv
= *vtop
; /* save value to handle it later */
4449 vtop
--; /* no vpop so that FP stack is not flushed */
4457 bt1
= t1
& VT_BTYPE
;
4459 bt2
= t2
& VT_BTYPE
;
4460 /* cast operands to correct type according to ISOC rules */
4461 if (is_float(bt1
) || is_float(bt2
)) {
4462 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
4463 type
.t
= VT_LDOUBLE
;
4464 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
4469 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
4470 /* cast to biggest op */
4472 /* convert to unsigned if it does not fit in a long long */
4473 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
4474 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
4475 type
.t
|= VT_UNSIGNED
;
4476 } else if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
4477 /* If one is a null ptr constant the result type
4479 if (is_null_pointer (vtop
))
4481 else if (is_null_pointer (&sv
))
4483 /* XXX: test pointer compatibility, C99 has more elaborate
4487 } else if (bt1
== VT_FUNC
|| bt2
== VT_FUNC
) {
4488 /* XXX: test function pointer compatibility */
4489 type
= bt1
== VT_FUNC
? type1
: type2
;
4490 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
4491 /* XXX: test structure compatibility */
4492 type
= bt1
== VT_STRUCT
? type1
: type2
;
4493 } else if (bt1
== VT_VOID
|| bt2
== VT_VOID
) {
4494 /* NOTE: as an extension, we accept void on only one side */
4497 /* integer operations */
4499 /* convert to unsigned if it does not fit in an integer */
4500 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
4501 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
4502 type
.t
|= VT_UNSIGNED
;
4505 /* now we convert second operand */
4507 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4510 if (is_float(type
.t
)) {
4512 #ifdef TCC_TARGET_X86_64
4513 if ((type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4517 } else if ((type
.t
& VT_BTYPE
) == VT_LLONG
) {
4518 /* for long longs, we use fixed registers to avoid having
4519 to handle a complicated move */
4524 /* this is horrible, but we must also convert first
4528 /* put again first value and cast it */
4531 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4534 move_reg(r2
, r1
, type
.t
);
4541 static void expr_eq(void)
4547 (tok
>= TOK_A_MOD
&& tok
<= TOK_A_DIV
) ||
4548 tok
== TOK_A_XOR
|| tok
== TOK_A_OR
||
4549 tok
== TOK_A_SHL
|| tok
== TOK_A_SAR
) {
4564 ST_FUNC
void gexpr(void)
4575 /* parse an expression and return its type without any side effect. */
4576 static void expr_type(CType
*type
)
4578 int saved_nocode_wanted
;
4580 saved_nocode_wanted
= nocode_wanted
;
4585 nocode_wanted
= saved_nocode_wanted
;
4588 /* parse a unary expression and return its type without any side
4590 static void unary_type(CType
*type
)
4602 /* parse a constant expression and return value in vtop. */
4603 static void expr_const1(void)
4612 /* parse an integer constant and return its value. */
4613 ST_FUNC
int expr_const(void)
4617 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
4618 expect("constant expression");
4624 /* return the label token if current token is a label, otherwise
4626 static int is_label(void)
4630 /* fast test first */
4631 if (tok
< TOK_UIDENT
)
4633 /* no need to save tokc because tok is an identifier */
4640 unget_tok(last_tok
);
4645 static void label_or_decl(int l
)
4649 /* fast test first */
4650 if (tok
>= TOK_UIDENT
)
4652 /* no need to save tokc because tok is an identifier */
4656 unget_tok(last_tok
);
4659 unget_tok(last_tok
);
4664 static void block(int *bsym
, int *csym
, int *case_sym
, int *def_sym
,
4665 int case_reg
, int is_expr
)
4668 Sym
*s
, *frame_bottom
;
4670 /* generate line number info */
4671 if (tcc_state
->do_debug
&&
4672 (last_line_num
!= file
->line_num
|| last_ind
!= ind
)) {
4673 put_stabn(N_SLINE
, 0, file
->line_num
, ind
- func_ind
);
4675 last_line_num
= file
->line_num
;
4679 /* default return value is (void) */
4681 vtop
->type
.t
= VT_VOID
;
4684 if (tok
== TOK_IF
) {
4691 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4693 if (c
== TOK_ELSE
) {
4697 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4698 gsym(d
); /* patch else jmp */
4701 } else if (tok
== TOK_WHILE
) {
4709 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4713 } else if (tok
== '{') {
4715 int block_vla_sp_loc
, *saved_vla_sp_loc
, saved_vla_flags
;
4718 /* record local declaration stack position */
4720 frame_bottom
= sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
4721 frame_bottom
->next
= scope_stack_bottom
;
4722 scope_stack_bottom
= frame_bottom
;
4723 llabel
= local_label_stack
;
4725 /* save VLA state */
4726 block_vla_sp_loc
= *(saved_vla_sp_loc
= vla_sp_loc
);
4727 if (saved_vla_sp_loc
!= &vla_sp_root_loc
)
4728 vla_sp_loc
= &block_vla_sp_loc
;
4730 saved_vla_flags
= vla_flags
;
4731 vla_flags
|= VLA_NEED_NEW_FRAME
;
4733 /* handle local labels declarations */
4734 if (tok
== TOK_LABEL
) {
4737 if (tok
< TOK_UIDENT
)
4738 expect("label identifier");
4739 label_push(&local_label_stack
, tok
, LABEL_DECLARED
);
4749 while (tok
!= '}') {
4750 label_or_decl(VT_LOCAL
);
4754 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
4757 /* pop locally defined labels */
4758 label_pop(&local_label_stack
, llabel
);
4760 /* XXX: this solution makes only valgrind happy...
4761 triggered by gcc.c-torture/execute/20000917-1.c */
4763 switch(vtop
->type
.t
& VT_BTYPE
) {
4765 /* this breaks a compilation of the linux kernel v2.4.26 */
4766 /* pmd_t *new = ({ __asm__ __volatile__("ud2\n") ; ((pmd_t *)1); }); */
4767 /* Look a commit a80acab: Display error on statement expressions with complex return type */
4768 /* A pointer is not a complex return type */
4772 for(p
=vtop
->type
.ref
;p
;p
=p
->prev
)
4774 tcc_error("unsupported expression type");
4777 /* pop locally defined symbols */
4778 scope_stack_bottom
= scope_stack_bottom
->next
;
4779 sym_pop(&local_stack
, s
);
4781 /* Pop VLA frames and restore stack pointer if required */
4782 if (saved_vla_sp_loc
!= &vla_sp_root_loc
)
4783 *saved_vla_sp_loc
= block_vla_sp_loc
;
4784 if (vla_sp_loc
!= (saved_vla_sp_loc
== &vla_sp_root_loc
? &vla_sp_root_loc
: &block_vla_sp_loc
)) {
4785 vla_sp_loc
= saved_vla_sp_loc
;
4786 gen_vla_sp_restore(*vla_sp_loc
);
4788 vla_flags
= (vla_flags
& ~VLA_SCOPE_FLAGS
) | (saved_vla_flags
& VLA_SCOPE_FLAGS
);
4791 } else if (tok
== TOK_RETURN
) {
4795 gen_assign_cast(&func_vt
);
4796 #ifdef TCC_TARGET_ARM64
4797 // Perhaps it would be better to use this for all backends:
4800 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
4801 CType type
, ret_type
;
4802 int ret_align
, ret_nregs
;
4803 ret_nregs
= gfunc_sret(&func_vt
, func_var
, &ret_type
,
4805 if (0 == ret_nregs
) {
4806 /* if returning structure, must copy it to implicit
4807 first pointer arg location */
4810 vset(&type
, VT_LOCAL
| VT_LVAL
, func_vc
);
4813 /* copy structure value to pointer */
4816 /* returning structure packed into registers */
4817 int r
, size
, addr
, align
;
4818 size
= type_size(&func_vt
,&align
);
4819 if ((vtop
->r
!= (VT_LOCAL
| VT_LVAL
) || (vtop
->c
.i
& (ret_align
-1)))
4820 && (align
& (ret_align
-1))) {
4821 loc
= (loc
- size
) & -align
;
4824 vset(&type
, VT_LOCAL
| VT_LVAL
, addr
);
4827 vset(&ret_type
, VT_LOCAL
| VT_LVAL
, addr
);
4829 vtop
->type
= ret_type
;
4830 if (is_float(ret_type
.t
))
4831 r
= rc_fret(ret_type
.t
);
4837 if (--ret_nregs
== 0)
4839 /* We assume that when a structure is returned in multiple
4840 registers, their classes are consecutive values of the
4843 /* XXX: compatible with arm only: ret_align == register_size */
4844 vtop
->c
.i
+= ret_align
;
4845 vtop
->r
= VT_LOCAL
| VT_LVAL
;
4848 } else if (is_float(func_vt
.t
)) {
4849 gv(rc_fret(func_vt
.t
));
4854 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
4857 rsym
= gjmp(rsym
); /* jmp */
4858 } else if (tok
== TOK_BREAK
) {
4861 tcc_error("cannot break");
4862 *bsym
= gjmp(*bsym
);
4865 } else if (tok
== TOK_CONTINUE
) {
4868 tcc_error("cannot continue");
4869 *csym
= gjmp(*csym
);
4872 } else if (tok
== TOK_FOR
) {
4877 frame_bottom
= sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
4878 frame_bottom
->next
= scope_stack_bottom
;
4879 scope_stack_bottom
= frame_bottom
;
4881 /* c99 for-loop init decl? */
4882 if (!decl0(VT_LOCAL
, 1)) {
4883 /* no, regular for-loop init expr */
4907 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4911 scope_stack_bottom
= scope_stack_bottom
->next
;
4912 sym_pop(&local_stack
, s
);
4914 if (tok
== TOK_DO
) {
4919 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4930 if (tok
== TOK_SWITCH
) {
4934 /* XXX: other types than integer */
4935 case_reg
= gv(RC_INT
);
4939 b
= gjmp(0); /* jump to first case */
4941 block(&a
, csym
, &b
, &c
, case_reg
, 0);
4942 /* if no default, jmp after switch */
4950 if (tok
== TOK_CASE
) {
4957 if (gnu_ext
&& tok
== TOK_DOTS
) {
4961 tcc_warning("empty case range");
4963 /* since a case is like a label, we must skip it with a jmp */
4971 *case_sym
= gtst(1, 0);
4974 *case_sym
= gtst(1, 0);
4978 *case_sym
= gtst(1, *case_sym
);
4980 case_reg
= gv(RC_INT
);
4985 goto block_after_label
;
4987 if (tok
== TOK_DEFAULT
) {
4993 tcc_error("too many 'default'");
4996 goto block_after_label
;
4998 if (tok
== TOK_GOTO
) {
5000 if (tok
== '*' && gnu_ext
) {
5004 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
)
5007 } else if (tok
>= TOK_UIDENT
) {
5008 s
= label_find(tok
);
5009 /* put forward definition if needed */
5011 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
5013 if (s
->r
== LABEL_DECLARED
)
5014 s
->r
= LABEL_FORWARD
;
5016 /* label already defined */
5017 if (vla_flags
& VLA_IN_SCOPE
) {
5018 /* If VLAs are in use, save the current stack pointer and
5019 reset the stack pointer to what it was at function entry
5020 (label will restore stack pointer in inner scopes) */
5022 gen_vla_sp_restore(vla_sp_root_loc
);
5024 if (s
->r
& LABEL_FORWARD
)
5025 s
->jnext
= gjmp(s
->jnext
);
5027 gjmp_addr(s
->jnext
);
5030 expect("label identifier");
5033 } else if (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
) {
5039 if (vla_flags
& VLA_IN_SCOPE
) {
5040 /* save/restore stack pointer across label
5041 this is a no-op when combined with the load immediately
5042 after the label unless we arrive via goto */
5047 if (s
->r
== LABEL_DEFINED
)
5048 tcc_error("duplicate label '%s'", get_tok_str(s
->v
, NULL
));
5050 s
->r
= LABEL_DEFINED
;
5052 s
= label_push(&global_label_stack
, b
, LABEL_DEFINED
);
5055 if (vla_flags
& VLA_IN_SCOPE
) {
5056 gen_vla_sp_restore(*vla_sp_loc
);
5057 vla_flags
|= VLA_NEED_NEW_FRAME
;
5059 /* we accept this, but it is a mistake */
5062 tcc_warning("deprecated use of label at end of compound statement");
5066 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
5069 /* expression case */
5084 /* t is the array or struct type. c is the array or struct
5085 address. cur_index/cur_field is the pointer to the current
5086 value. 'size_only' is true if only size info is needed (only used
5088 static void decl_designator(CType
*type
, Section
*sec
, unsigned long c
,
5089 int *cur_index
, Sym
**cur_field
,
5093 int notfirst
, index
, index_last
, align
, l
, nb_elems
, elem_size
;
5099 if (gnu_ext
&& (l
= is_label()) != 0)
5101 while (tok
== '[' || tok
== '.') {
5103 if (!(type
->t
& VT_ARRAY
))
5104 expect("array type");
5107 index
= expr_const();
5108 if (index
< 0 || (s
->c
>= 0 && index
>= s
->c
))
5109 expect("invalid index");
5110 if (tok
== TOK_DOTS
&& gnu_ext
) {
5112 index_last
= expr_const();
5113 if (index_last
< 0 ||
5114 (s
->c
>= 0 && index_last
>= s
->c
) ||
5116 expect("invalid index");
5122 *cur_index
= index_last
;
5123 type
= pointed_type(type
);
5124 elem_size
= type_size(type
, &align
);
5125 c
+= index
* elem_size
;
5126 /* NOTE: we only support ranges for last designator */
5127 nb_elems
= index_last
- index
+ 1;
5128 if (nb_elems
!= 1) {
5137 if ((type
->t
& VT_BTYPE
) != VT_STRUCT
)
5138 expect("struct/union type");
5151 /* XXX: fix this mess by using explicit storage field */
5153 type1
.t
|= (type
->t
& ~VT_TYPE
);
5167 if (type
->t
& VT_ARRAY
) {
5169 type
= pointed_type(type
);
5170 c
+= index
* type_size(type
, &align
);
5174 tcc_error("too many field init");
5175 /* XXX: fix this mess by using explicit storage field */
5177 type1
.t
|= (type
->t
& ~VT_TYPE
);
5182 decl_initializer(type
, sec
, c
, 0, size_only
);
5184 /* XXX: make it more general */
5185 if (!size_only
&& nb_elems
> 1) {
5186 unsigned long c_end
;
5191 tcc_error("range init not supported yet for dynamic storage");
5192 c_end
= c
+ nb_elems
* elem_size
;
5193 if (c_end
> sec
->data_allocated
)
5194 section_realloc(sec
, c_end
);
5195 src
= sec
->data
+ c
;
5197 for(i
= 1; i
< nb_elems
; i
++) {
5199 memcpy(dst
, src
, elem_size
);
5205 #define EXPR_CONST 1
5208 /* store a value or an expression directly in global data or in local array */
5209 static void init_putv(CType
*type
, Section
*sec
, unsigned long c
,
5210 int v
, int expr_type
)
5212 int saved_global_expr
, bt
, bit_pos
, bit_size
;
5214 unsigned long long bit_mask
;
5222 /* compound literals must be allocated globally in this case */
5223 saved_global_expr
= global_expr
;
5226 global_expr
= saved_global_expr
;
5227 /* NOTE: symbols are accepted */
5228 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) != VT_CONST
)
5229 tcc_error("initializer element is not constant");
5237 dtype
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
5240 /* XXX: not portable */
5241 /* XXX: generate error if incorrect relocation */
5242 gen_assign_cast(&dtype
);
5243 bt
= type
->t
& VT_BTYPE
;
5244 /* we'll write at most 16 bytes */
5245 if (c
+ 16 > sec
->data_allocated
) {
5246 section_realloc(sec
, c
+ 16);
5248 ptr
= sec
->data
+ c
;
5249 /* XXX: make code faster ? */
5250 if (!(type
->t
& VT_BITFIELD
)) {
5255 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5256 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
5257 bit_mask
= (1LL << bit_size
) - 1;
5259 if ((vtop
->r
& VT_SYM
) &&
5265 (bt
== VT_INT
&& bit_size
!= 32)))
5266 tcc_error("initializer element is not computable at load time");
5268 /* XXX: when cross-compiling we assume that each type has the
5269 same representation on host and target, which is likely to
5270 be wrong in the case of long double */
5272 vtop
->c
.i
= (vtop
->c
.i
!= 0);
5274 *(char *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5277 *(short *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5280 *(double *)ptr
= vtop
->c
.d
;
5283 *(long double *)ptr
= vtop
->c
.ld
;
5286 *(long long *)ptr
|= (vtop
->c
.ll
& bit_mask
) << bit_pos
;
5289 addr_t val
= (vtop
->c
.ptr_offset
& bit_mask
) << bit_pos
;
5290 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
5291 if (vtop
->r
& VT_SYM
)
5292 greloca(sec
, vtop
->sym
, c
, R_DATA_PTR
, val
);
5294 *(addr_t
*)ptr
|= val
;
5296 if (vtop
->r
& VT_SYM
)
5297 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
5298 *(addr_t
*)ptr
|= val
;
5303 int val
= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5304 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
5305 if (vtop
->r
& VT_SYM
)
5306 greloca(sec
, vtop
->sym
, c
, R_DATA_PTR
, val
);
5310 if (vtop
->r
& VT_SYM
)
5311 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
5319 vset(&dtype
, VT_LOCAL
|VT_LVAL
, c
);
5326 /* put zeros for variable based init */
5327 static void init_putz(CType
*t
, Section
*sec
, unsigned long c
, int size
)
5330 /* nothing to do because globals are already set to zero */
5332 vpush_global_sym(&func_old_type
, TOK_memset
);
5334 #ifdef TCC_TARGET_ARM
5345 /* 't' contains the type and storage info. 'c' is the offset of the
5346 object in section 'sec'. If 'sec' is NULL, it means stack based
5347 allocation. 'first' is true if array '{' must be read (multi
5348 dimension implicit array init handling). 'size_only' is true if
5349 size only evaluation is wanted (only for arrays). */
5350 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
,
5351 int first
, int size_only
)
5353 int index
, array_length
, n
, no_oblock
, nb
, parlevel
, parlevel1
, i
;
5354 int size1
, align1
, expr_type
;
5358 if (type
->t
& VT_VLA
) {
5361 /* save current stack pointer */
5362 if (vla_flags
& VLA_NEED_NEW_FRAME
) {
5364 vla_flags
= VLA_IN_SCOPE
;
5365 vla_sp_loc
= &vla_sp_loc_tmp
;
5368 vla_runtime_type_size(type
, &a
);
5369 gen_vla_alloc(type
, a
);
5370 vset(type
, VT_LOCAL
|VT_LVAL
, c
);
5374 } else if (type
->t
& VT_ARRAY
) {
5378 t1
= pointed_type(type
);
5379 size1
= type_size(t1
, &align1
);
5382 if ((first
&& tok
!= TOK_LSTR
&& tok
!= TOK_STR
) ||
5385 tcc_error("character array initializer must be a literal,"
5386 " optionally enclosed in braces");
5391 /* only parse strings here if correct type (otherwise: handle
5392 them as ((w)char *) expressions */
5393 if ((tok
== TOK_LSTR
&&
5394 #ifdef TCC_TARGET_PE
5395 (t1
->t
& VT_BTYPE
) == VT_SHORT
&& (t1
->t
& VT_UNSIGNED
)
5397 (t1
->t
& VT_BTYPE
) == VT_INT
5399 ) || (tok
== TOK_STR
&& (t1
->t
& VT_BTYPE
) == VT_BYTE
)) {
5400 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5405 /* compute maximum number of chars wanted */
5407 cstr_len
= cstr
->size
;
5409 cstr_len
= cstr
->size
/ sizeof(nwchar_t
);
5412 if (n
>= 0 && nb
> (n
- array_length
))
5413 nb
= n
- array_length
;
5416 tcc_warning("initializer-string for array is too long");
5417 /* in order to go faster for common case (char
5418 string in global variable, we handle it
5420 if (sec
&& tok
== TOK_STR
&& size1
== 1) {
5421 memcpy(sec
->data
+ c
+ array_length
, cstr
->data
, nb
);
5425 ch
= ((unsigned char *)cstr
->data
)[i
];
5427 ch
= ((nwchar_t
*)cstr
->data
)[i
];
5428 init_putv(t1
, sec
, c
+ (array_length
+ i
) * size1
,
5436 /* only add trailing zero if enough storage (no
5437 warning in this case since it is standard) */
5438 if (n
< 0 || array_length
< n
) {
5440 init_putv(t1
, sec
, c
+ (array_length
* size1
), 0, EXPR_VAL
);
5446 while (tok
!= '}') {
5447 decl_designator(type
, sec
, c
, &index
, NULL
, size_only
);
5448 if (n
>= 0 && index
>= n
)
5449 tcc_error("index too large");
5450 /* must put zero in holes (note that doing it that way
5451 ensures that it even works with designators) */
5452 if (!size_only
&& array_length
< index
) {
5453 init_putz(t1
, sec
, c
+ array_length
* size1
,
5454 (index
- array_length
) * size1
);
5457 if (index
> array_length
)
5458 array_length
= index
;
5459 /* special test for multi dimensional arrays (may not
5460 be strictly correct if designators are used at the
5462 if (index
>= n
&& no_oblock
)
5471 /* put zeros at the end */
5472 if (!size_only
&& n
>= 0 && array_length
< n
) {
5473 init_putz(t1
, sec
, c
+ array_length
* size1
,
5474 (n
- array_length
) * size1
);
5476 /* patch type size if needed */
5478 s
->c
= array_length
;
5479 } else if ((type
->t
& VT_BTYPE
) == VT_STRUCT
&&
5480 (sec
|| !first
|| tok
== '{')) {
5483 /* NOTE: the previous test is a specific case for automatic
5484 struct/union init */
5485 /* XXX: union needs only one init */
5487 /* XXX: this test is incorrect for local initializers
5488 beginning with ( without {. It would be much more difficult
5489 to do it correctly (ideally, the expression parser should
5490 be used in all cases) */
5496 while (tok
== '(') {
5500 if (!parse_btype(&type1
, &ad1
))
5502 type_decl(&type1
, &ad1
, &n
, TYPE_ABSTRACT
);
5504 if (!is_assignable_types(type
, &type1
))
5505 tcc_error("invalid type for cast");
5510 if (first
|| tok
== '{') {
5519 while (tok
!= '}') {
5520 decl_designator(type
, sec
, c
, NULL
, &f
, size_only
);
5522 if (!size_only
&& array_length
< index
) {
5523 init_putz(type
, sec
, c
+ array_length
,
5524 index
- array_length
);
5526 index
= index
+ type_size(&f
->type
, &align1
);
5527 if (index
> array_length
)
5528 array_length
= index
;
5530 /* gr: skip fields from same union - ugly. */
5533 int f_size
= type_size(&f
->type
, &align
);
5534 int f_type
= (f
->type
.t
& VT_BTYPE
);
5536 ///printf("index: %2d %08x -- %2d %08x\n", f->c, f->type.t, f->next->c, f->next->type.t);
5537 /* test for same offset */
5538 if (f
->next
->c
!= f
->c
)
5540 if ((f_type
== VT_STRUCT
) && (f_size
== 0)) {
5542 Lets assume a structure of size 0 can't be a member of the union.
5543 This allow to compile the following code from a linux kernel v2.4.26
5544 typedef struct { } rwlock_t;
5550 struct fs_struct init_fs = { { (1) }, (rwlock_t) {}, 0022, };
5551 tcc-0.9.23 can succesfully compile this version of the kernel.
5552 gcc don't have problems with this code too.
5556 /* if yes, test for bitfield shift */
5557 if ((f
->type
.t
& VT_BITFIELD
) && (f
->next
->type
.t
& VT_BITFIELD
)) {
5558 int bit_pos_1
= (f
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5559 int bit_pos_2
= (f
->next
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5560 //printf("bitfield %d %d\n", bit_pos_1, bit_pos_2);
5561 if (bit_pos_1
!= bit_pos_2
)
5568 if (no_oblock
&& f
== NULL
)
5574 /* put zeros at the end */
5575 if (!size_only
&& array_length
< n
) {
5576 init_putz(type
, sec
, c
+ array_length
,
5585 } else if (tok
== '{') {
5587 decl_initializer(type
, sec
, c
, first
, size_only
);
5589 } else if (size_only
) {
5590 /* just skip expression */
5591 parlevel
= parlevel1
= 0;
5592 while ((parlevel
> 0 || parlevel1
> 0 ||
5593 (tok
!= '}' && tok
!= ',')) && tok
!= -1) {
5596 else if (tok
== ')')
5598 else if (tok
== '{')
5600 else if (tok
== '}')
5605 /* currently, we always use constant expression for globals
5606 (may change for scripting case) */
5607 expr_type
= EXPR_CONST
;
5609 expr_type
= EXPR_ANY
;
5610 init_putv(type
, sec
, c
, 0, expr_type
);
5614 /* parse an initializer for type 't' if 'has_init' is non zero, and
5615 allocate space in local or global data space ('r' is either
5616 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
5617 variable 'v' with an associated name represented by 'asm_label' of
5618 scope 'scope' is declared before initializers are parsed. If 'v' is
5619 zero, then a reference to the new object is put in the value stack.
5620 If 'has_init' is 2, a special parsing is done to handle string
5622 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
,
5623 int has_init
, int v
, char *asm_label
,
5626 int size
, align
, addr
, data_offset
;
5628 ParseState saved_parse_state
= {0};
5629 TokenString init_str
;
5631 Sym
*flexible_array
;
5633 flexible_array
= NULL
;
5634 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
5635 Sym
*field
= type
->ref
->next
;
5638 field
= field
->next
;
5639 if (field
->type
.t
& VT_ARRAY
&& field
->type
.ref
->c
< 0)
5640 flexible_array
= field
;
5644 size
= type_size(type
, &align
);
5645 /* If unknown size, we must evaluate it before
5646 evaluating initializers because
5647 initializers can generate global data too
5648 (e.g. string pointers or ISOC99 compound
5649 literals). It also simplifies local
5650 initializers handling */
5651 tok_str_new(&init_str
);
5652 if ((size
< 0 || flexible_array
) && has_init
) {
5653 /* get all init string */
5654 if (has_init
== 2) {
5655 /* only get strings */
5656 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5657 tok_str_add_tok(&init_str
);
5662 while (level
> 0 || (tok
!= ',' && tok
!= ';')) {
5664 tcc_error("unexpected end of file in initializer");
5665 tok_str_add_tok(&init_str
);
5668 else if (tok
== '}') {
5678 tok_str_add(&init_str
, -1);
5679 tok_str_add(&init_str
, 0);
5682 save_parse_state(&saved_parse_state
);
5684 macro_ptr
= init_str
.str
;
5686 decl_initializer(type
, NULL
, 0, 1, 1);
5687 /* prepare second initializer parsing */
5688 macro_ptr
= init_str
.str
;
5691 size
= type_size(type
, &align
);
5694 /* if still unknown size, error */
5696 tcc_error("unknown type size");
5698 if (nocode_wanted
) {
5699 //tcc_warning("nocode_wanted set for decl_initializer_alloc");
5705 size
+= flexible_array
->type
.ref
->c
* pointed_size(&flexible_array
->type
);
5706 /* take into account specified alignment if bigger */
5707 if (ad
->a
.aligned
) {
5708 if (ad
->a
.aligned
> align
)
5709 align
= ad
->a
.aligned
;
5710 } else if (ad
->a
.packed
) {
5713 if ((r
& VT_VALMASK
) == VT_LOCAL
) {
5715 #ifdef CONFIG_TCC_BCHECK
5716 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5720 loc
= (loc
- size
) & -align
;
5722 #ifdef CONFIG_TCC_BCHECK
5723 /* handles bounds */
5724 /* XXX: currently, since we do only one pass, we cannot track
5725 '&' operators, so we add only arrays */
5726 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5727 unsigned long *bounds_ptr
;
5728 /* add padding between regions */
5730 /* then add local bound info */
5731 bounds_ptr
= section_ptr_add(lbounds_section
, 2 * sizeof(unsigned long));
5732 bounds_ptr
[0] = addr
;
5733 bounds_ptr
[1] = size
;
5737 /* local variable */
5738 sym_push(v
, type
, r
, addr
);
5740 /* push local reference */
5741 vset(type
, r
, addr
);
5747 if (v
&& scope
== VT_CONST
) {
5748 /* see if the symbol was already defined */
5751 if (!is_compatible_types(&sym
->type
, type
))
5752 tcc_error("incompatible types for redefinition of '%s'",
5753 get_tok_str(v
, NULL
));
5754 if (sym
->type
.t
& VT_EXTERN
) {
5755 /* if the variable is extern, it was not allocated */
5756 sym
->type
.t
&= ~VT_EXTERN
;
5757 /* set array size if it was omitted in extern
5759 if ((sym
->type
.t
& VT_ARRAY
) &&
5760 sym
->type
.ref
->c
< 0 &&
5762 sym
->type
.ref
->c
= type
->ref
->c
;
5764 /* we accept several definitions of the same
5765 global variable. this is tricky, because we
5766 must play with the SHN_COMMON type of the symbol */
5767 /* XXX: should check if the variable was already
5768 initialized. It is incorrect to initialized it
5770 /* no init data, we won't add more to the symbol */
5777 /* allocate symbol in corresponding section */
5782 else if (tcc_state
->nocommon
)
5786 data_offset
= sec
->data_offset
;
5787 data_offset
= (data_offset
+ align
- 1) & -align
;
5789 /* very important to increment global pointer at this time
5790 because initializers themselves can create new initializers */
5791 data_offset
+= size
;
5792 #ifdef CONFIG_TCC_BCHECK
5793 /* add padding if bound check */
5794 if (tcc_state
->do_bounds_check
)
5797 sec
->data_offset
= data_offset
;
5798 /* allocate section space to put the data */
5799 if (sec
->sh_type
!= SHT_NOBITS
&&
5800 data_offset
> sec
->data_allocated
)
5801 section_realloc(sec
, data_offset
);
5802 /* align section if needed */
5803 if (align
> sec
->sh_addralign
)
5804 sec
->sh_addralign
= align
;
5806 addr
= 0; /* avoid warning */
5810 if (scope
!= VT_CONST
|| !sym
) {
5811 sym
= sym_push(v
, type
, r
| VT_SYM
, 0);
5812 sym
->asm_label
= asm_label
;
5814 /* update symbol definition */
5816 put_extern_sym(sym
, sec
, addr
, size
);
5819 /* put a common area */
5820 put_extern_sym(sym
, NULL
, align
, size
);
5821 /* XXX: find a nicer way */
5822 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
5823 esym
->st_shndx
= SHN_COMMON
;
5826 /* push global reference */
5827 sym
= get_sym_ref(type
, sec
, addr
, size
);
5828 vpushsym(type
, sym
);
5830 /* patch symbol weakness */
5831 if (type
->t
& VT_WEAK
)
5833 apply_visibility(sym
, type
);
5834 #ifdef CONFIG_TCC_BCHECK
5835 /* handles bounds now because the symbol must be defined
5836 before for the relocation */
5837 if (tcc_state
->do_bounds_check
) {
5838 unsigned long *bounds_ptr
;
5840 greloc(bounds_section
, sym
, bounds_section
->data_offset
, R_DATA_PTR
);
5841 /* then add global bound info */
5842 bounds_ptr
= section_ptr_add(bounds_section
, 2 * sizeof(long));
5843 bounds_ptr
[0] = 0; /* relocated */
5844 bounds_ptr
[1] = size
;
5848 if (has_init
|| (type
->t
& VT_VLA
)) {
5849 decl_initializer(type
, sec
, addr
, 1, 0);
5850 /* patch flexible array member size back to -1, */
5851 /* for possible subsequent similar declarations */
5853 flexible_array
->type
.ref
->c
= -1;
5856 /* restore parse state if needed */
5858 tok_str_free(init_str
.str
);
5859 restore_parse_state(&saved_parse_state
);
5863 static void put_func_debug(Sym
*sym
)
5868 /* XXX: we put here a dummy type */
5869 snprintf(buf
, sizeof(buf
), "%s:%c1",
5870 funcname
, sym
->type
.t
& VT_STATIC
? 'f' : 'F');
5871 put_stabs_r(buf
, N_FUN
, 0, file
->line_num
, 0,
5872 cur_text_section
, sym
->c
);
5873 /* //gr gdb wants a line at the function */
5874 put_stabn(N_SLINE
, 0, file
->line_num
, 0);
5879 /* parse an old style function declaration list */
5880 /* XXX: check multiple parameter */
5881 static void func_decl_list(Sym
*func_sym
)
5888 /* parse each declaration */
5889 while (tok
!= '{' && tok
!= ';' && tok
!= ',' && tok
!= TOK_EOF
&&
5890 tok
!= TOK_ASM1
&& tok
!= TOK_ASM2
&& tok
!= TOK_ASM3
) {
5891 if (!parse_btype(&btype
, &ad
))
5892 expect("declaration list");
5893 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
5894 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
5896 /* we accept no variable after */
5900 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
5901 /* find parameter in function parameter list */
5904 if ((s
->v
& ~SYM_FIELD
) == v
)
5908 tcc_error("declaration for parameter '%s' but no such parameter",
5909 get_tok_str(v
, NULL
));
5911 /* check that no storage specifier except 'register' was given */
5912 if (type
.t
& VT_STORAGE
)
5913 tcc_error("storage class specified for '%s'", get_tok_str(v
, NULL
));
5914 convert_parameter_type(&type
);
5915 /* we can add the type (NOTE: it could be local to the function) */
5917 /* accept other parameters */
5928 /* parse a function defined by symbol 'sym' and generate its code in
5929 'cur_text_section' */
5930 static void gen_function(Sym
*sym
)
5932 ind
= cur_text_section
->data_offset
;
5933 /* NOTE: we patch the symbol size later */
5934 put_extern_sym(sym
, cur_text_section
, ind
, 0);
5935 funcname
= get_tok_str(sym
->v
, NULL
);
5937 /* Initialize VLA state */
5938 vla_sp_loc
= &vla_sp_root_loc
;
5939 vla_flags
= VLA_NEED_NEW_FRAME
;
5940 /* put debug symbol */
5941 if (tcc_state
->do_debug
)
5942 put_func_debug(sym
);
5943 /* push a dummy symbol to enable local sym storage */
5944 sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
5945 gfunc_prolog(&sym
->type
);
5946 #ifdef CONFIG_TCC_BCHECK
5947 if (tcc_state
->do_bounds_check
5948 && !strcmp(get_tok_str(sym
->v
, NULL
), "main")) {
5952 for (i
= 0, sym
= local_stack
; i
< 2; i
++, sym
= sym
->prev
) {
5953 if (sym
->v
& SYM_FIELD
|| sym
->prev
->v
& SYM_FIELD
)
5955 vpush_global_sym(&func_old_type
, TOK___bound_main_arg
);
5956 vset(&sym
->type
, sym
->r
, sym
->c
);
5962 block(NULL
, NULL
, NULL
, NULL
, 0, 0);
5965 cur_text_section
->data_offset
= ind
;
5966 label_pop(&global_label_stack
, NULL
);
5967 /* reset local stack */
5968 scope_stack_bottom
= NULL
;
5969 sym_pop(&local_stack
, NULL
);
5970 /* end of function */
5971 /* patch symbol size */
5972 ((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
].st_size
=
5974 /* patch symbol weakness (this definition overrules any prototype) */
5975 if (sym
->type
.t
& VT_WEAK
)
5977 apply_visibility(sym
, &sym
->type
);
5978 if (tcc_state
->do_debug
) {
5979 put_stabn(N_FUN
, 0, 0, ind
- func_ind
);
5981 /* It's better to crash than to generate wrong code */
5982 cur_text_section
= NULL
;
5983 funcname
= ""; /* for safety */
5984 func_vt
.t
= VT_VOID
; /* for safety */
5985 func_var
= 0; /* for safety */
5986 ind
= 0; /* for safety */
5989 ST_FUNC
void gen_inline_functions(void)
5992 int *str
, inline_generated
, i
;
5993 struct InlineFunc
*fn
;
5995 /* iterate while inline function are referenced */
5997 inline_generated
= 0;
5998 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
5999 fn
= tcc_state
->inline_fns
[i
];
6001 if (sym
&& sym
->c
) {
6002 /* the function was used: generate its code and
6003 convert it to a normal function */
6004 str
= fn
->token_str
;
6007 pstrcpy(file
->filename
, sizeof file
->filename
, fn
->filename
);
6008 sym
->r
= VT_SYM
| VT_CONST
;
6009 sym
->type
.t
&= ~VT_INLINE
;
6013 cur_text_section
= text_section
;
6015 macro_ptr
= NULL
; /* fail safe */
6017 inline_generated
= 1;
6020 if (!inline_generated
)
6023 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
6024 fn
= tcc_state
->inline_fns
[i
];
6025 str
= fn
->token_str
;
6028 dynarray_reset(&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
);
6031 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
6032 static int decl0(int l
, int is_for_loop_init
)
6040 if (!parse_btype(&btype
, &ad
)) {
6041 if (is_for_loop_init
)
6043 /* skip redundant ';' */
6044 /* XXX: find more elegant solution */
6049 if (l
== VT_CONST
&&
6050 (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
6051 /* global asm block */
6055 /* special test for old K&R protos without explicit int
6056 type. Only accepted when defining global data */
6057 if (l
== VT_LOCAL
|| tok
< TOK_DEFINE
)
6061 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
6062 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
6064 /* we accept no variable after */
6068 while (1) { /* iterate thru each declaration */
6069 char *asm_label
; // associated asm label
6071 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
6075 type_to_str(buf
, sizeof(buf
), t
, get_tok_str(v
, NULL
));
6076 printf("type = '%s'\n", buf
);
6079 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
6080 if ((type
.t
& VT_STATIC
) && (l
== VT_LOCAL
)) {
6081 tcc_error("function without file scope cannot be static");
6083 /* if old style function prototype, we accept a
6086 if (sym
->c
== FUNC_OLD
)
6087 func_decl_list(sym
);
6091 if (gnu_ext
&& (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
6094 asm_label_instr(&astr
);
6095 asm_label
= tcc_strdup(astr
.data
);
6098 /* parse one last attribute list, after asm label */
6099 parse_attribute(&ad
);
6104 #ifdef TCC_TARGET_PE
6105 if (ad
.a
.func_import
)
6106 type
.t
|= VT_IMPORT
;
6107 if (ad
.a
.func_export
)
6108 type
.t
|= VT_EXPORT
;
6110 type
.t
|= ad
.a
.visibility
<< VT_VIS_SHIFT
;
6114 tcc_error("cannot use local functions");
6115 if ((type
.t
& VT_BTYPE
) != VT_FUNC
)
6116 expect("function definition");
6118 /* reject abstract declarators in function definition */
6120 while ((sym
= sym
->next
) != NULL
)
6121 if (!(sym
->v
& ~SYM_FIELD
))
6122 expect("identifier");
6124 /* XXX: cannot do better now: convert extern line to static inline */
6125 if ((type
.t
& (VT_EXTERN
| VT_INLINE
)) == (VT_EXTERN
| VT_INLINE
))
6126 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
6131 if ((sym
->type
.t
& VT_BTYPE
) != VT_FUNC
)
6134 ref
= sym
->type
.ref
;
6135 if (0 == ref
->a
.func_proto
)
6136 tcc_error("redefinition of '%s'", get_tok_str(v
, NULL
));
6138 /* use func_call from prototype if not defined */
6139 if (ref
->a
.func_call
!= FUNC_CDECL
6140 && type
.ref
->a
.func_call
== FUNC_CDECL
)
6141 type
.ref
->a
.func_call
= ref
->a
.func_call
;
6143 /* use export from prototype */
6144 if (ref
->a
.func_export
)
6145 type
.ref
->a
.func_export
= 1;
6147 /* use static from prototype */
6148 if (sym
->type
.t
& VT_STATIC
)
6149 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
6151 /* If the definition has no visibility use the
6152 one from prototype. */
6153 if (! (type
.t
& VT_VIS_MASK
))
6154 type
.t
|= sym
->type
.t
& VT_VIS_MASK
;
6156 if (!is_compatible_types(&sym
->type
, &type
)) {
6158 tcc_error("incompatible types for redefinition of '%s'",
6159 get_tok_str(v
, NULL
));
6161 type
.ref
->a
.func_proto
= 0;
6162 /* if symbol is already defined, then put complete type */
6165 /* put function symbol */
6166 sym
= global_identifier_push(v
, type
.t
, 0);
6167 sym
->type
.ref
= type
.ref
;
6170 /* static inline functions are just recorded as a kind
6171 of macro. Their code will be emitted at the end of
6172 the compilation unit only if they are used */
6173 if ((type
.t
& (VT_INLINE
| VT_STATIC
)) ==
6174 (VT_INLINE
| VT_STATIC
)) {
6175 TokenString func_str
;
6177 struct InlineFunc
*fn
;
6178 const char *filename
;
6180 tok_str_new(&func_str
);
6186 tcc_error("unexpected end of file");
6187 tok_str_add_tok(&func_str
);
6192 } else if (t
== '}') {
6194 if (block_level
== 0)
6198 tok_str_add(&func_str
, -1);
6199 tok_str_add(&func_str
, 0);
6200 filename
= file
? file
->filename
: "";
6201 fn
= tcc_malloc(sizeof *fn
+ strlen(filename
));
6202 strcpy(fn
->filename
, filename
);
6204 fn
->token_str
= func_str
.str
;
6205 dynarray_add((void ***)&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
, fn
);
6208 /* compute text section */
6209 cur_text_section
= ad
.section
;
6210 if (!cur_text_section
)
6211 cur_text_section
= text_section
;
6212 sym
->r
= VT_SYM
| VT_CONST
;
6217 if (btype
.t
& VT_TYPEDEF
) {
6218 /* save typedefed type */
6219 /* XXX: test storage specifiers ? */
6220 sym
= sym_push(v
, &type
, 0, 0);
6222 sym
->type
.t
|= VT_TYPEDEF
;
6225 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
6226 /* external function definition */
6227 /* specific case for func_call attribute */
6228 ad
.a
.func_proto
= 1;
6230 } else if (!(type
.t
& VT_ARRAY
)) {
6231 /* not lvalue if array */
6232 r
|= lvalue_type(type
.t
);
6234 has_init
= (tok
== '=');
6235 if (has_init
&& (type
.t
& VT_VLA
))
6236 tcc_error("Variable length array cannot be initialized");
6237 if ((btype
.t
& VT_EXTERN
) || ((type
.t
& VT_BTYPE
) == VT_FUNC
) ||
6238 ((type
.t
& VT_ARRAY
) && (type
.t
& VT_STATIC
) &&
6239 !has_init
&& l
== VT_CONST
&& type
.ref
->c
< 0)) {
6240 /* external variable or function */
6241 /* NOTE: as GCC, uninitialized global static
6242 arrays of null size are considered as
6244 sym
= external_sym(v
, &type
, r
, asm_label
);
6246 if (ad
.alias_target
) {
6251 alias_target
= sym_find(ad
.alias_target
);
6252 if (!alias_target
|| !alias_target
->c
)
6253 tcc_error("unsupported forward __alias__ attribute");
6254 esym
= &((Elf32_Sym
*)symtab_section
->data
)[alias_target
->c
];
6255 tsec
.sh_num
= esym
->st_shndx
;
6256 put_extern_sym2(sym
, &tsec
, esym
->st_value
, esym
->st_size
, 0);
6259 type
.t
|= (btype
.t
& VT_STATIC
); /* Retain "static". */
6260 if (type
.t
& VT_STATIC
)
6266 decl_initializer_alloc(&type
, &ad
, r
, has_init
, v
, asm_label
, l
);
6270 if (is_for_loop_init
)
6283 ST_FUNC
void decl(int l
)