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
, int *par_count_p
);
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 if (sbt
== VT_VOID
&& dbt
== VT_VOID
)
2418 It is Ok if both are void
2424 gcc accepts this program
2427 tcc_error("cannot cast from/to void");
2429 if (dt
->t
& VT_CONSTANT
)
2430 tcc_warning("assignment of read-only location");
2433 /* special cases for pointers */
2434 /* '0' can also be a pointer */
2435 if (is_null_pointer(vtop
))
2437 /* accept implicit pointer to integer cast with warning */
2438 if (is_integer_btype(sbt
)) {
2439 tcc_warning("assignment makes pointer from integer without a cast");
2442 type1
= pointed_type(dt
);
2443 /* a function is implicitely a function pointer */
2444 if (sbt
== VT_FUNC
) {
2445 if ((type1
->t
& VT_BTYPE
) != VT_VOID
&&
2446 !is_compatible_types(pointed_type(dt
), st
))
2447 tcc_warning("assignment from incompatible pointer type");
2452 type2
= pointed_type(st
);
2453 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
2454 (type2
->t
& VT_BTYPE
) == VT_VOID
) {
2455 /* void * can match anything */
2457 /* exact type match, except for unsigned */
2460 tmp_type1
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
|
2462 tmp_type2
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
|
2464 if (!is_compatible_types(&tmp_type1
, &tmp_type2
))
2465 tcc_warning("assignment from incompatible pointer type");
2467 /* check const and volatile */
2468 if ((!(type1
->t
& VT_CONSTANT
) && (type2
->t
& VT_CONSTANT
)) ||
2469 (!(type1
->t
& VT_VOLATILE
) && (type2
->t
& VT_VOLATILE
)))
2470 tcc_warning("assignment discards qualifiers from pointer target type");
2476 if (sbt
== VT_PTR
|| sbt
== VT_FUNC
) {
2477 tcc_warning("assignment makes integer from pointer without a cast");
2479 /* XXX: more tests */
2484 tmp_type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2485 tmp_type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2486 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
2488 type_to_str(buf1
, sizeof(buf1
), st
, NULL
);
2489 type_to_str(buf2
, sizeof(buf2
), dt
, NULL
);
2490 tcc_error("cannot cast '%s' to '%s'", buf1
, buf2
);
2498 /* store vtop in lvalue pushed on stack */
2499 ST_FUNC
void vstore(void)
2501 int sbt
, dbt
, ft
, r
, t
, size
, align
, bit_size
, bit_pos
, rc
, delayed_cast
;
2503 ft
= vtop
[-1].type
.t
;
2504 sbt
= vtop
->type
.t
& VT_BTYPE
;
2505 dbt
= ft
& VT_BTYPE
;
2506 if ((((sbt
== VT_INT
|| sbt
== VT_SHORT
) && dbt
== VT_BYTE
) ||
2507 (sbt
== VT_INT
&& dbt
== VT_SHORT
))
2508 && !(vtop
->type
.t
& VT_BITFIELD
)) {
2509 /* optimize char/short casts */
2510 delayed_cast
= VT_MUSTCAST
;
2511 vtop
->type
.t
= ft
& (VT_TYPE
& ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
)));
2512 /* XXX: factorize */
2513 if (ft
& VT_CONSTANT
)
2514 tcc_warning("assignment of read-only location");
2517 if (!(ft
& VT_BITFIELD
))
2518 gen_assign_cast(&vtop
[-1].type
);
2521 if (sbt
== VT_STRUCT
) {
2522 /* if structure, only generate pointer */
2523 /* structure assignment : generate memcpy */
2524 /* XXX: optimize if small size */
2525 if (!nocode_wanted
) {
2526 size
= type_size(&vtop
->type
, &align
);
2530 vtop
->type
.t
= VT_PTR
;
2533 /* address of memcpy() */
2536 vpush_global_sym(&func_old_type
, TOK_memcpy8
);
2537 else if(!(align
& 3))
2538 vpush_global_sym(&func_old_type
, TOK_memcpy4
);
2541 vpush_global_sym(&func_old_type
, TOK_memcpy
);
2546 vtop
->type
.t
= VT_PTR
;
2555 /* leave source on stack */
2556 } else if (ft
& VT_BITFIELD
) {
2557 /* bitfield store handling */
2559 /* save lvalue as expression result (example: s.b = s.a = n;) */
2560 vdup(), vtop
[-1] = vtop
[-2];
2562 bit_pos
= (ft
>> VT_STRUCT_SHIFT
) & 0x3f;
2563 bit_size
= (ft
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
2564 /* remove bit field info to avoid loops */
2565 vtop
[-1].type
.t
= ft
& ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
));
2567 if((ft
& VT_BTYPE
) == VT_BOOL
) {
2568 gen_cast(&vtop
[-1].type
);
2569 vtop
[-1].type
.t
= (vtop
[-1].type
.t
& ~VT_BTYPE
) | (VT_BYTE
| VT_UNSIGNED
);
2572 /* duplicate destination */
2574 vtop
[-1] = vtop
[-2];
2576 /* mask and shift source */
2577 if((ft
& VT_BTYPE
) != VT_BOOL
) {
2578 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2579 vpushll((1ULL << bit_size
) - 1ULL);
2581 vpushi((1 << bit_size
) - 1);
2587 /* load destination, mask and or with source */
2589 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2590 vpushll(~(((1ULL << bit_size
) - 1ULL) << bit_pos
));
2592 vpushi(~(((1 << bit_size
) - 1) << bit_pos
));
2598 /* ... and discard */
2602 #ifdef CONFIG_TCC_BCHECK
2603 /* bound check case */
2604 if (vtop
[-1].r
& VT_MUSTBOUND
) {
2610 if (!nocode_wanted
) {
2614 #ifdef TCC_TARGET_X86_64
2615 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
2617 } else if ((ft
& VT_BTYPE
) == VT_QFLOAT
) {
2622 r
= gv(rc
); /* generate value */
2623 /* if lvalue was saved on stack, must read it */
2624 if ((vtop
[-1].r
& VT_VALMASK
) == VT_LLOCAL
) {
2626 t
= get_reg(RC_INT
);
2627 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2632 sv
.r
= VT_LOCAL
| VT_LVAL
;
2633 sv
.c
.ul
= vtop
[-1].c
.ul
;
2635 vtop
[-1].r
= t
| VT_LVAL
;
2637 /* two word case handling : store second register at word + 4 (or +8 for x86-64) */
2638 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2639 if (((ft
& VT_BTYPE
) == VT_QLONG
) || ((ft
& VT_BTYPE
) == VT_QFLOAT
)) {
2640 int addr_type
= VT_LLONG
, load_size
= 8, load_type
= ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) ? VT_LLONG
: VT_DOUBLE
;
2642 if ((ft
& VT_BTYPE
) == VT_LLONG
) {
2643 int addr_type
= VT_INT
, load_size
= 4, load_type
= VT_INT
;
2645 vtop
[-1].type
.t
= load_type
;
2648 /* convert to int to increment easily */
2649 vtop
->type
.t
= addr_type
;
2655 vtop
[-1].type
.t
= load_type
;
2656 /* XXX: it works because r2 is spilled last ! */
2657 store(vtop
->r2
, vtop
- 1);
2663 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
2664 vtop
->r
|= delayed_cast
;
2668 /* post defines POST/PRE add. c is the token ++ or -- */
2669 ST_FUNC
void inc(int post
, int c
)
2672 vdup(); /* save lvalue */
2674 gv_dup(); /* duplicate value */
2679 vpushi(c
- TOK_MID
);
2681 vstore(); /* store value */
2683 vpop(); /* if post op, return saved value */
2686 /* Parse GNUC __attribute__ extension. Currently, the following
2687 extensions are recognized:
2688 - aligned(n) : set data/function alignment.
2689 - packed : force data alignment to 1
2690 - section(x) : generate data/code in this section.
2691 - unused : currently ignored, but may be used someday.
2692 - regparm(n) : pass function parameters in registers (i386 only)
2694 static void parse_attribute(AttributeDef
*ad
)
2698 while (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
) {
2702 while (tok
!= ')') {
2703 if (tok
< TOK_IDENT
)
2704 expect("attribute name");
2712 expect("section name");
2713 ad
->section
= find_section(tcc_state
, (char *)tokc
.cstr
->data
);
2721 expect("alias(\"target\")");
2722 ad
->alias_target
= /* save string as token, for later */
2723 tok_alloc((char*)tokc
.cstr
->data
, tokc
.cstr
->size
-1)->tok
;
2727 case TOK_VISIBILITY1
:
2728 case TOK_VISIBILITY2
:
2731 expect("visibility(\"default|hidden|internal|protected\")");
2732 if (!strcmp (tokc
.cstr
->data
, "default"))
2733 ad
->a
.visibility
= STV_DEFAULT
;
2734 else if (!strcmp (tokc
.cstr
->data
, "hidden"))
2735 ad
->a
.visibility
= STV_HIDDEN
;
2736 else if (!strcmp (tokc
.cstr
->data
, "internal"))
2737 ad
->a
.visibility
= STV_INTERNAL
;
2738 else if (!strcmp (tokc
.cstr
->data
, "protected"))
2739 ad
->a
.visibility
= STV_PROTECTED
;
2741 expect("visibility(\"default|hidden|internal|protected\")");
2750 if (n
<= 0 || (n
& (n
- 1)) != 0)
2751 tcc_error("alignment must be a positive power of two");
2768 /* currently, no need to handle it because tcc does not
2769 track unused objects */
2773 /* currently, no need to handle it because tcc does not
2774 track unused objects */
2779 ad
->a
.func_call
= FUNC_CDECL
;
2784 ad
->a
.func_call
= FUNC_STDCALL
;
2786 #ifdef TCC_TARGET_I386
2796 ad
->a
.func_call
= FUNC_FASTCALL1
+ n
- 1;
2802 ad
->a
.func_call
= FUNC_FASTCALLW
;
2809 ad
->a
.mode
= VT_LLONG
+ 1;
2812 ad
->a
.mode
= VT_SHORT
+ 1;
2815 ad
->a
.mode
= VT_INT
+ 1;
2818 tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok
, NULL
));
2825 ad
->a
.func_export
= 1;
2828 ad
->a
.func_import
= 1;
2831 if (tcc_state
->warn_unsupported
)
2832 tcc_warning("'%s' attribute ignored", get_tok_str(t
, NULL
));
2833 /* skip parameters */
2835 int parenthesis
= 0;
2839 else if (tok
== ')')
2842 } while (parenthesis
&& tok
!= -1);
2855 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
2856 static void struct_decl(CType
*type
, int u
, int tdef
)
2858 int a
, v
, size
, align
, maxalign
, c
, offset
, flexible
;
2859 int bit_size
, bit_pos
, bsize
, bt
, lbit_pos
, prevbt
;
2860 Sym
*s
, *ss
, *ass
, **ps
;
2864 a
= tok
; /* save decl type */
2869 /* struct already defined ? return it */
2871 expect("struct/union/enum name");
2875 tcc_error("invalid type");
2877 } else if (tok
>= TOK_IDENT
&& !tdef
)
2878 tcc_error("unknown struct/union/enum");
2884 /* we put an undefined size for struct/union */
2885 s
= sym_push(v
| SYM_STRUCT
, &type1
, 0, -1);
2886 s
->r
= 0; /* default alignment is zero as gcc */
2887 /* put struct/union/enum name in type */
2895 tcc_error("struct/union/enum already defined");
2896 /* cannot be empty */
2898 /* non empty enums are not allowed */
2899 if (a
== TOK_ENUM
) {
2903 expect("identifier");
2905 if (ss
&& !local_stack
)
2906 tcc_error("redefinition of enumerator '%s'",
2907 get_tok_str(v
, NULL
));
2913 /* enum symbols have static storage */
2914 ss
= sym_push(v
, &int_type
, VT_CONST
, c
);
2915 ss
->type
.t
|= VT_STATIC
;
2920 /* NOTE: we accept a trailing comma */
2924 s
->c
= type_size(&int_type
, &align
);
2933 while (tok
!= '}') {
2934 parse_btype(&btype
, &ad
);
2937 tcc_error("flexible array member '%s' not at the end of struct",
2938 get_tok_str(v
, NULL
));
2943 type_decl(&type1
, &ad
, &v
, TYPE_DIRECT
| TYPE_ABSTRACT
);
2944 if (v
== 0 && (type1
.t
& VT_BTYPE
) != VT_STRUCT
)
2945 expect("identifier");
2946 if (type_size(&type1
, &align
) < 0) {
2947 if ((a
== TOK_STRUCT
) && (type1
.t
& VT_ARRAY
) && c
)
2950 tcc_error("field '%s' has incomplete type",
2951 get_tok_str(v
, NULL
));
2953 if ((type1
.t
& VT_BTYPE
) == VT_FUNC
||
2954 (type1
.t
& (VT_TYPEDEF
| VT_STATIC
| VT_EXTERN
| VT_INLINE
)))
2955 tcc_error("invalid type for '%s'",
2956 get_tok_str(v
, NULL
));
2960 bit_size
= expr_const();
2961 /* XXX: handle v = 0 case for messages */
2963 tcc_error("negative width in bit-field '%s'",
2964 get_tok_str(v
, NULL
));
2965 if (v
&& bit_size
== 0)
2966 tcc_error("zero width for bit-field '%s'",
2967 get_tok_str(v
, NULL
));
2969 size
= type_size(&type1
, &align
);
2971 if (align
< ad
.a
.aligned
)
2972 align
= ad
.a
.aligned
;
2973 } else if (ad
.a
.packed
) {
2975 } else if (*tcc_state
->pack_stack_ptr
) {
2976 if (align
> *tcc_state
->pack_stack_ptr
)
2977 align
= *tcc_state
->pack_stack_ptr
;
2980 if (bit_size
>= 0) {
2981 bt
= type1
.t
& VT_BTYPE
;
2988 tcc_error("bitfields must have scalar type");
2990 if (bit_size
> bsize
) {
2991 tcc_error("width of '%s' exceeds its type",
2992 get_tok_str(v
, NULL
));
2993 } else if (bit_size
== bsize
) {
2994 /* no need for bit fields */
2996 } else if (bit_size
== 0) {
2997 /* XXX: what to do if only padding in a
2999 /* zero size: means to pad */
3002 /* we do not have enough room ?
3003 did the type change?
3005 if ((bit_pos
+ bit_size
) > bsize
||
3006 bt
!= prevbt
|| a
== TOK_UNION
)
3009 /* XXX: handle LSB first */
3010 type1
.t
|= VT_BITFIELD
|
3011 (bit_pos
<< VT_STRUCT_SHIFT
) |
3012 (bit_size
<< (VT_STRUCT_SHIFT
+ 6));
3013 bit_pos
+= bit_size
;
3019 if (v
!= 0 || (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
3020 /* add new memory data only if starting
3022 if (lbit_pos
== 0) {
3023 if (a
== TOK_STRUCT
) {
3024 c
= (c
+ align
- 1) & -align
;
3033 if (align
> maxalign
)
3037 printf("add field %s offset=%d",
3038 get_tok_str(v
, NULL
), offset
);
3039 if (type1
.t
& VT_BITFIELD
) {
3040 printf(" pos=%d size=%d",
3041 (type1
.t
>> VT_STRUCT_SHIFT
) & 0x3f,
3042 (type1
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f);
3047 if (v
== 0 && (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
3049 while ((ass
= ass
->next
) != NULL
) {
3050 ss
= sym_push(ass
->v
, &ass
->type
, 0, offset
+ ass
->c
);
3055 ss
= sym_push(v
| SYM_FIELD
, &type1
, 0, offset
);
3059 if (tok
== ';' || tok
== TOK_EOF
)
3066 /* store size and alignment */
3067 s
->c
= (c
+ maxalign
- 1) & -maxalign
;
3073 /* return 1 if basic type is a type size (short, long, long long) */
3074 ST_FUNC
int is_btype_size(int bt
)
3076 return bt
== VT_SHORT
|| bt
== VT_LONG
|| bt
== VT_LLONG
;
3079 /* return 0 if no type declaration. otherwise, return the basic type
3082 static int parse_btype(CType
*type
, AttributeDef
*ad
)
3084 int t
, u
, bt_size
, complete
, type_found
, typespec_found
;
3088 memset(ad
, 0, sizeof(AttributeDef
));
3096 /* currently, we really ignore extension */
3107 tcc_error("too many basic types");
3109 bt_size
= is_btype_size (u
& VT_BTYPE
);
3110 if (u
== VT_INT
|| (!bt_size
&& !(t
& VT_TYPEDEF
)))
3125 if ((t
& VT_BTYPE
) == VT_DOUBLE
) {
3126 #ifndef TCC_TARGET_PE
3127 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3129 } else if ((t
& VT_BTYPE
) == VT_LONG
) {
3130 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3136 #ifdef TCC_TARGET_ARM64
3138 /* GCC's __uint128_t appears in some Linux header files. Make it a
3139 synonym for long double to get the size and alignment right. */
3151 if ((t
& VT_BTYPE
) == VT_LONG
) {
3152 #ifdef TCC_TARGET_PE
3153 t
= (t
& ~VT_BTYPE
) | VT_DOUBLE
;
3155 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3163 struct_decl(&type1
, VT_ENUM
, t
& (VT_TYPEDEF
| VT_EXTERN
));
3166 type
->ref
= type1
.ref
;
3170 struct_decl(&type1
, VT_STRUCT
, t
& (VT_TYPEDEF
| VT_EXTERN
));
3173 /* type modifiers */
3189 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == (VT_DEFSIGN
|VT_UNSIGNED
))
3190 tcc_error("signed and unsigned modifier");
3203 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == VT_DEFSIGN
)
3204 tcc_error("signed and unsigned modifier");
3205 t
|= VT_DEFSIGN
| VT_UNSIGNED
;
3230 /* GNUC attribute */
3231 case TOK_ATTRIBUTE1
:
3232 case TOK_ATTRIBUTE2
:
3233 parse_attribute(ad
);
3236 t
= (t
& ~VT_BTYPE
) | u
;
3244 parse_expr_type(&type1
);
3245 /* remove all storage modifiers except typedef */
3246 type1
.t
&= ~(VT_STORAGE
&~VT_TYPEDEF
);
3252 if (!s
|| !(s
->type
.t
& VT_TYPEDEF
))
3254 t
|= (s
->type
.t
& ~VT_TYPEDEF
);
3255 type
->ref
= s
->type
.ref
;
3257 /* get attributes from typedef */
3258 if (0 == ad
->a
.aligned
)
3259 ad
->a
.aligned
= s
->a
.aligned
;
3260 if (0 == ad
->a
.func_call
)
3261 ad
->a
.func_call
= s
->a
.func_call
;
3262 ad
->a
.packed
|= s
->a
.packed
;
3271 if (tcc_state
->char_is_unsigned
) {
3272 if ((t
& (VT_DEFSIGN
|VT_BTYPE
)) == VT_BYTE
)
3276 /* long is never used as type */
3277 if ((t
& VT_BTYPE
) == VT_LONG
)
3278 #if (!defined TCC_TARGET_X86_64 && !defined TCC_TARGET_ARM64) || \
3279 defined TCC_TARGET_PE
3280 t
= (t
& ~VT_BTYPE
) | VT_INT
;
3282 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3288 /* convert a function parameter type (array to pointer and function to
3289 function pointer) */
3290 static inline void convert_parameter_type(CType
*pt
)
3292 /* remove const and volatile qualifiers (XXX: const could be used
3293 to indicate a const function parameter */
3294 pt
->t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3295 /* array must be transformed to pointer according to ANSI C */
3297 if ((pt
->t
& VT_BTYPE
) == VT_FUNC
) {
3302 ST_FUNC
void parse_asm_str(CString
*astr
)
3305 /* read the string */
3307 expect("string constant");
3309 while (tok
== TOK_STR
) {
3310 /* XXX: add \0 handling too ? */
3311 cstr_cat(astr
, tokc
.cstr
->data
);
3314 cstr_ccat(astr
, '\0');
3317 /* Parse an asm label and return the label
3318 * Don't forget to free the CString in the caller! */
3319 static void asm_label_instr(CString
*astr
)
3322 parse_asm_str(astr
);
3325 printf("asm_alias: \"%s\"\n", (char *)astr
->data
);
3329 static void post_type(CType
*type
, AttributeDef
*ad
)
3331 int n
, l
, t1
, arg_size
, align
;
3332 Sym
**plast
, *s
, *first
;
3337 /* function declaration */
3345 /* read param name and compute offset */
3346 if (l
!= FUNC_OLD
) {
3347 if (!parse_btype(&pt
, &ad1
)) {
3349 tcc_error("invalid type");
3356 if ((pt
.t
& VT_BTYPE
) == VT_VOID
&& tok
== ')')
3358 type_decl(&pt
, &ad1
, &n
, TYPE_DIRECT
| TYPE_ABSTRACT
);
3359 if ((pt
.t
& VT_BTYPE
) == VT_VOID
)
3360 tcc_error("parameter declared as void");
3361 arg_size
+= (type_size(&pt
, &align
) + PTR_SIZE
- 1) / PTR_SIZE
;
3366 expect("identifier");
3370 convert_parameter_type(&pt
);
3371 s
= sym_push(n
| SYM_FIELD
, &pt
, 0, 0);
3377 if (l
== FUNC_NEW
&& tok
== TOK_DOTS
) {
3384 /* if no parameters, then old type prototype */
3388 /* NOTE: const is ignored in returned type as it has a special
3389 meaning in gcc / C++ */
3390 type
->t
&= ~VT_CONSTANT
;
3391 /* some ancient pre-K&R C allows a function to return an array
3392 and the array brackets to be put after the arguments, such
3393 that "int c()[]" means something like "int[] c()" */
3396 skip(']'); /* only handle simple "[]" */
3399 /* we push a anonymous symbol which will contain the function prototype */
3400 ad
->a
.func_args
= arg_size
;
3401 s
= sym_push(SYM_FIELD
, type
, 0, l
);
3406 } else if (tok
== '[') {
3407 /* array definition */
3409 if (tok
== TOK_RESTRICT1
)
3414 if (!local_stack
|| nocode_wanted
)
3415 vpushi(expr_const());
3417 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3420 tcc_error("invalid array size");
3422 if (!is_integer_btype(vtop
->type
.t
& VT_BTYPE
))
3423 tcc_error("size of variable length array should be an integer");
3428 /* parse next post type */
3429 post_type(type
, ad
);
3430 if (type
->t
== VT_FUNC
)
3431 tcc_error("declaration of an array of functions");
3432 t1
|= type
->t
& VT_VLA
;
3435 loc
-= type_size(&int_type
, &align
);
3439 vla_runtime_type_size(type
, &align
);
3441 vset(&int_type
, VT_LOCAL
|VT_LVAL
, loc
);
3448 /* we push an anonymous symbol which will contain the array
3450 s
= sym_push(SYM_FIELD
, type
, 0, n
);
3451 type
->t
= (t1
? VT_VLA
: VT_ARRAY
) | VT_PTR
;
3456 /* Parse a type declaration (except basic type), and return the type
3457 in 'type'. 'td' is a bitmask indicating which kind of type decl is
3458 expected. 'type' should contain the basic type. 'ad' is the
3459 attribute definition of the basic type. It can be modified by
3462 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
)
3465 CType type1
, *type2
;
3466 int qualifiers
, storage
;
3468 while (tok
== '*') {
3476 qualifiers
|= VT_CONSTANT
;
3481 qualifiers
|= VT_VOLATILE
;
3489 type
->t
|= qualifiers
;
3492 /* XXX: clarify attribute handling */
3493 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3494 parse_attribute(ad
);
3496 /* recursive type */
3497 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
3498 type1
.t
= 0; /* XXX: same as int */
3501 /* XXX: this is not correct to modify 'ad' at this point, but
3502 the syntax is not clear */
3503 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3504 parse_attribute(ad
);
3505 type_decl(&type1
, ad
, v
, td
);
3508 /* type identifier */
3509 if (tok
>= TOK_IDENT
&& (td
& TYPE_DIRECT
)) {
3513 if (!(td
& TYPE_ABSTRACT
))
3514 expect("identifier");
3518 storage
= type
->t
& VT_STORAGE
;
3519 type
->t
&= ~VT_STORAGE
;
3520 if (storage
& VT_STATIC
) {
3521 int saved_nocode_wanted
= nocode_wanted
;
3523 post_type(type
, ad
);
3524 nocode_wanted
= saved_nocode_wanted
;
3526 post_type(type
, ad
);
3528 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3529 parse_attribute(ad
);
3533 /* append type at the end of type1 */
3546 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
3547 ST_FUNC
int lvalue_type(int t
)
3552 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
3554 else if (bt
== VT_SHORT
)
3558 if (t
& VT_UNSIGNED
)
3559 r
|= VT_LVAL_UNSIGNED
;
3563 /* indirection with full error checking and bound check */
3564 ST_FUNC
void indir(void)
3566 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
) {
3567 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FUNC
)
3571 if ((vtop
->r
& VT_LVAL
) && !nocode_wanted
)
3573 vtop
->type
= *pointed_type(&vtop
->type
);
3574 /* Arrays and functions are never lvalues */
3575 if (!(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_VLA
)
3576 && (vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
3577 vtop
->r
|= lvalue_type(vtop
->type
.t
);
3578 /* if bound checking, the referenced pointer must be checked */
3579 #ifdef CONFIG_TCC_BCHECK
3580 if (tcc_state
->do_bounds_check
)
3581 vtop
->r
|= VT_MUSTBOUND
;
3586 /* pass a parameter to a function and do type checking and casting */
3587 static void gfunc_param_typed(Sym
*func
, Sym
*arg
)
3592 func_type
= func
->c
;
3593 if (func_type
== FUNC_OLD
||
3594 (func_type
== FUNC_ELLIPSIS
&& arg
== NULL
)) {
3595 /* default casting : only need to convert float to double */
3596 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
) {
3599 } else if (vtop
->type
.t
& VT_BITFIELD
) {
3600 type
.t
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
3603 } else if (arg
== NULL
) {
3604 tcc_error("too many arguments to function");
3607 type
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
3608 gen_assign_cast(&type
);
3612 /* parse an expression of the form '(type)' or '(expr)' and return its
3614 static void parse_expr_type(CType
*type
)
3620 if (parse_btype(type
, &ad
)) {
3621 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3628 static void parse_type(CType
*type
)
3633 if (!parse_btype(type
, &ad
)) {
3636 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3639 static void vpush_tokc(int t
)
3644 vsetc(&type
, VT_CONST
, &tokc
);
3647 ST_FUNC
void unary(void)
3649 int n
, t
, align
, size
, r
, sizeof_caller
;
3653 static int in_sizeof
= 0;
3655 sizeof_caller
= in_sizeof
;
3657 /* XXX: GCC 2.95.3 does not generate a table although it should be
3671 vpush_tokc(VT_INT
| VT_UNSIGNED
);
3675 vpush_tokc(VT_LLONG
);
3679 vpush_tokc(VT_LLONG
| VT_UNSIGNED
);
3683 vpush_tokc(VT_FLOAT
);
3687 vpush_tokc(VT_DOUBLE
);
3691 vpush_tokc(VT_LDOUBLE
);
3694 case TOK___FUNCTION__
:
3696 goto tok_identifier
;
3702 /* special function name identifier */
3703 len
= strlen(funcname
) + 1;
3704 /* generate char[len] type */
3709 vpush_ref(&type
, data_section
, data_section
->data_offset
, len
);
3710 ptr
= section_ptr_add(data_section
, len
);
3711 memcpy(ptr
, funcname
, len
);
3716 #ifdef TCC_TARGET_PE
3717 t
= VT_SHORT
| VT_UNSIGNED
;
3723 /* string parsing */
3726 if (tcc_state
->warn_write_strings
)
3731 memset(&ad
, 0, sizeof(AttributeDef
));
3732 decl_initializer_alloc(&type
, &ad
, VT_CONST
, 2, 0, NULL
, 0);
3737 if (parse_btype(&type
, &ad
)) {
3738 type_decl(&type
, &ad
, &n
, TYPE_ABSTRACT
);
3740 /* check ISOC99 compound literal */
3742 /* data is allocated locally by default */
3747 /* all except arrays are lvalues */
3748 if (!(type
.t
& VT_ARRAY
))
3749 r
|= lvalue_type(type
.t
);
3750 memset(&ad
, 0, sizeof(AttributeDef
));
3751 decl_initializer_alloc(&type
, &ad
, r
, 1, 0, NULL
, 0);
3753 if (sizeof_caller
) {
3760 } else if (tok
== '{') {
3761 /* save all registers */
3763 /* statement expression : we do not accept break/continue
3764 inside as GCC does */
3765 block(NULL
, NULL
, NULL
, NULL
, 0, 1);
3780 /* functions names must be treated as function pointers,
3781 except for unary '&' and sizeof. Since we consider that
3782 functions are not lvalues, we only have to handle it
3783 there and in function calls. */
3784 /* arrays can also be used although they are not lvalues */
3785 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
&&
3786 !(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_LLOCAL
))
3788 mk_pointer(&vtop
->type
);
3794 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3796 boolean
.t
= VT_BOOL
;
3798 vtop
->c
.i
= !vtop
->c
.i
;
3799 } else if ((vtop
->r
& VT_VALMASK
) == VT_CMP
)
3800 vtop
->c
.i
= vtop
->c
.i
^ 1;
3803 vseti(VT_JMP
, gvtst(1, 0));
3815 if ((vtop
->type
.t
& VT_BTYPE
) == VT_PTR
)
3816 tcc_error("pointer not accepted for unary plus");
3817 /* In order to force cast, we add zero, except for floating point
3818 where we really need an noop (otherwise -0.0 will be transformed
3820 if (!is_float(vtop
->type
.t
)) {
3831 unary_type(&type
); // Perform a in_sizeof = 0;
3832 size
= type_size(&type
, &align
);
3833 if (t
== TOK_SIZEOF
) {
3834 if (!(type
.t
& VT_VLA
)) {
3836 tcc_error("sizeof applied to an incomplete type");
3839 vla_runtime_type_size(&type
, &align
);
3844 vtop
->type
.t
|= VT_UNSIGNED
;
3847 case TOK_builtin_types_compatible_p
:
3856 type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3857 type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3858 vpushi(is_compatible_types(&type1
, &type2
));
3861 case TOK_builtin_constant_p
:
3863 int saved_nocode_wanted
, res
;
3866 saved_nocode_wanted
= nocode_wanted
;
3869 res
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
3871 nocode_wanted
= saved_nocode_wanted
;
3876 case TOK_builtin_frame_address
:
3877 case TOK_builtin_return_address
:
3884 if (tok
!= TOK_CINT
|| tokc
.i
< 0) {
3885 tcc_error("%s only takes positive integers",
3886 tok1
== TOK_builtin_return_address
?
3887 "__builtin_return_address" :
3888 "__builtin_frame_address");
3895 vset(&type
, VT_LOCAL
, 0); /* local frame */
3897 mk_pointer(&vtop
->type
);
3898 indir(); /* -> parent frame */
3900 if (tok1
== TOK_builtin_return_address
) {
3901 // assume return address is just above frame pointer on stack
3904 mk_pointer(&vtop
->type
);
3909 #ifdef TCC_TARGET_X86_64
3910 #ifdef TCC_TARGET_PE
3911 case TOK_builtin_va_start
:
3919 if ((vtop
->r
& VT_VALMASK
) != VT_LOCAL
)
3920 tcc_error("__builtin_va_start expects a local variable");
3921 vtop
->r
&= ~(VT_LVAL
| VT_REF
);
3922 vtop
->type
= char_pointer_type
;
3927 case TOK_builtin_va_arg_types
:
3934 vpushi(classify_x86_64_va_arg(&type
));
3940 #ifdef TCC_TARGET_ARM64
3941 case TOK___va_start
: {
3951 vtop
->type
.t
= VT_VOID
;
3954 case TOK___va_arg
: {
3979 t
= vtop
->type
.t
& VT_BTYPE
;
3981 /* In IEEE negate(x) isn't subtract(0,x), but rather
3986 else if (t
== VT_DOUBLE
)
3997 goto tok_identifier
;
3999 /* allow to take the address of a label */
4000 if (tok
< TOK_UIDENT
)
4001 expect("label identifier");
4002 s
= label_find(tok
);
4004 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
4006 if (s
->r
== LABEL_DECLARED
)
4007 s
->r
= LABEL_FORWARD
;
4010 s
->type
.t
= VT_VOID
;
4011 mk_pointer(&s
->type
);
4012 s
->type
.t
|= VT_STATIC
;
4014 vpushsym(&s
->type
, s
);
4018 // special qnan , snan and infinity values
4020 vpush64(VT_DOUBLE
, 0x7ff8000000000000ULL
);
4024 vpush64(VT_DOUBLE
, 0x7ff0000000000001ULL
);
4028 vpush64(VT_DOUBLE
, 0x7ff0000000000000ULL
);
4037 expect("identifier");
4040 const char *name
= get_tok_str(t
, NULL
);
4042 tcc_error("'%s' undeclared", name
);
4043 /* for simple function calls, we tolerate undeclared
4044 external reference to int() function */
4045 if (tcc_state
->warn_implicit_function_declaration
4046 #ifdef TCC_TARGET_PE
4047 /* people must be warned about using undeclared WINAPI functions
4048 (which usually start with uppercase letter) */
4049 || (name
[0] >= 'A' && name
[0] <= 'Z')
4052 tcc_warning("implicit declaration of function '%s'", name
);
4053 s
= external_global_sym(t
, &func_old_type
, 0);
4055 if ((s
->type
.t
& (VT_STATIC
| VT_INLINE
| VT_BTYPE
)) ==
4056 (VT_STATIC
| VT_INLINE
| VT_FUNC
)) {
4057 /* if referencing an inline function, then we generate a
4058 symbol to it if not already done. It will have the
4059 effect to generate code for it at the end of the
4060 compilation unit. Inline function as always
4061 generated in the text section. */
4063 put_extern_sym(s
, text_section
, 0, 0);
4064 r
= VT_SYM
| VT_CONST
;
4068 vset(&s
->type
, r
, s
->c
);
4069 /* if forward reference, we must point to s */
4070 if (vtop
->r
& VT_SYM
) {
4072 vtop
->c
.ptr_offset
= 0;
4077 /* post operations */
4079 if (tok
== TOK_INC
|| tok
== TOK_DEC
) {
4082 } else if (tok
== '.' || tok
== TOK_ARROW
) {
4085 if (tok
== TOK_ARROW
)
4087 qualifiers
= vtop
->type
.t
& (VT_CONSTANT
| VT_VOLATILE
);
4091 /* expect pointer on structure */
4092 if ((vtop
->type
.t
& VT_BTYPE
) != VT_STRUCT
)
4093 expect("struct or union");
4097 while ((s
= s
->next
) != NULL
) {
4102 tcc_error("field not found: %s", get_tok_str(tok
& ~SYM_FIELD
, NULL
));
4103 /* add field offset to pointer */
4104 vtop
->type
= char_pointer_type
; /* change type to 'char *' */
4107 /* change type to field type, and set to lvalue */
4108 vtop
->type
= s
->type
;
4109 vtop
->type
.t
|= qualifiers
;
4110 /* an array is never an lvalue */
4111 if (!(vtop
->type
.t
& VT_ARRAY
)) {
4112 vtop
->r
|= lvalue_type(vtop
->type
.t
);
4113 #ifdef CONFIG_TCC_BCHECK
4114 /* if bound checking, the referenced pointer must be checked */
4115 if (tcc_state
->do_bounds_check
)
4116 vtop
->r
|= VT_MUSTBOUND
;
4120 } else if (tok
== '[') {
4126 } else if (tok
== '(') {
4129 int nb_args
, ret_nregs
, ret_align
, variadic
;
4132 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
4133 /* pointer test (no array accepted) */
4134 if ((vtop
->type
.t
& (VT_BTYPE
| VT_ARRAY
)) == VT_PTR
) {
4135 vtop
->type
= *pointed_type(&vtop
->type
);
4136 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
)
4140 expect("function pointer");
4143 vtop
->r
&= ~VT_LVAL
; /* no lvalue */
4145 /* get return type */
4148 sa
= s
->next
; /* first parameter */
4151 /* compute first implicit argument if a structure is returned */
4152 if ((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
4153 variadic
= (s
->c
== FUNC_ELLIPSIS
);
4154 ret_nregs
= gfunc_sret(&s
->type
, variadic
, &ret
.type
,
4157 /* get some space for the returned structure */
4158 size
= type_size(&s
->type
, &align
);
4159 #ifdef TCC_TARGET_ARM64
4160 /* On arm64, a small struct is return in registers.
4161 It is much easier to write it to memory if we know
4162 that we are allowed to write some extra bytes, so
4163 round the allocated space up to a power of 2: */
4165 while (size
& (size
- 1))
4166 size
= (size
| (size
- 1)) + 1;
4168 loc
= (loc
- size
) & -align
;
4170 ret
.r
= VT_LOCAL
| VT_LVAL
;
4171 /* pass it as 'int' to avoid structure arg passing
4173 vseti(VT_LOCAL
, loc
);
4183 /* return in register */
4184 if (is_float(ret
.type
.t
)) {
4185 ret
.r
= reg_fret(ret
.type
.t
);
4186 #ifdef TCC_TARGET_X86_64
4187 if ((ret
.type
.t
& VT_BTYPE
) == VT_QFLOAT
)
4191 #ifndef TCC_TARGET_ARM64
4192 #ifdef TCC_TARGET_X86_64
4193 if ((ret
.type
.t
& VT_BTYPE
) == VT_QLONG
)
4195 if ((ret
.type
.t
& VT_BTYPE
) == VT_LLONG
)
4206 gfunc_param_typed(s
, sa
);
4216 tcc_error("too few arguments to function");
4218 if (!nocode_wanted
) {
4219 gfunc_call(nb_args
);
4221 vtop
-= (nb_args
+ 1);
4225 for (r
= ret
.r
+ ret_nregs
+ !ret_nregs
; r
-- > ret
.r
;) {
4226 vsetc(&ret
.type
, r
, &ret
.c
);
4227 vtop
->r2
= ret
.r2
; /* Loop only happens when r2 is VT_CONST */
4230 /* handle packed struct return */
4231 if (((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) && ret_nregs
) {
4234 size
= type_size(&s
->type
, &align
);
4235 loc
= (loc
- size
) & -align
;
4239 vset(&ret
.type
, VT_LOCAL
| VT_LVAL
, addr
+ offset
);
4243 if (--ret_nregs
== 0)
4245 /* XXX: compatible with arm only: ret_align == register_size */
4246 offset
+= ret_align
;
4248 vset(&s
->type
, VT_LOCAL
| VT_LVAL
, addr
);
4256 ST_FUNC
void expr_prod(void)
4261 while (tok
== '*' || tok
== '/' || tok
== '%') {
4269 ST_FUNC
void expr_sum(void)
4274 while (tok
== '+' || tok
== '-') {
4282 static void expr_shift(void)
4287 while (tok
== TOK_SHL
|| tok
== TOK_SAR
) {
4295 static void expr_cmp(void)
4300 while ((tok
>= TOK_ULE
&& tok
<= TOK_GT
) ||
4301 tok
== TOK_ULT
|| tok
== TOK_UGE
) {
4309 static void expr_cmpeq(void)
4314 while (tok
== TOK_EQ
|| tok
== TOK_NE
) {
4322 static void expr_and(void)
4325 while (tok
== '&') {
4332 static void expr_xor(void)
4335 while (tok
== '^') {
4342 static void expr_or(void)
4345 while (tok
== '|') {
4352 /* XXX: fix this mess */
4353 static void expr_land_const(void)
4356 while (tok
== TOK_LAND
) {
4363 /* XXX: fix this mess */
4364 static void expr_lor_const(void)
4367 while (tok
== TOK_LOR
) {
4374 /* only used if non constant */
4375 static void expr_land(void)
4380 if (tok
== TOK_LAND
) {
4385 if (tok
!= TOK_LAND
) {
4395 static void expr_lor(void)
4400 if (tok
== TOK_LOR
) {
4405 if (tok
!= TOK_LOR
) {
4415 /* XXX: better constant handling */
4416 static void expr_cond(void)
4418 int tt
, u
, r1
, r2
, rc
, t1
, t2
, bt1
, bt2
;
4420 CType type
, type1
, type2
;
4427 boolean
.t
= VT_BOOL
;
4433 if (tok
!= ':' || !gnu_ext
) {
4448 if (vtop
!= vstack
) {
4449 /* needed to avoid having different registers saved in
4451 if (is_float(vtop
->type
.t
)) {
4453 #ifdef TCC_TARGET_X86_64
4454 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4464 if (tok
== ':' && gnu_ext
) {
4472 sv
= *vtop
; /* save value to handle it later */
4473 vtop
--; /* no vpop so that FP stack is not flushed */
4481 bt1
= t1
& VT_BTYPE
;
4483 bt2
= t2
& VT_BTYPE
;
4484 /* cast operands to correct type according to ISOC rules */
4485 if (is_float(bt1
) || is_float(bt2
)) {
4486 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
4487 type
.t
= VT_LDOUBLE
;
4488 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
4493 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
4494 /* cast to biggest op */
4496 /* convert to unsigned if it does not fit in a long long */
4497 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
4498 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
4499 type
.t
|= VT_UNSIGNED
;
4500 } else if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
4501 /* If one is a null ptr constant the result type
4503 if (is_null_pointer (vtop
))
4505 else if (is_null_pointer (&sv
))
4507 /* XXX: test pointer compatibility, C99 has more elaborate
4511 } else if (bt1
== VT_FUNC
|| bt2
== VT_FUNC
) {
4512 /* XXX: test function pointer compatibility */
4513 type
= bt1
== VT_FUNC
? type1
: type2
;
4514 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
4515 /* XXX: test structure compatibility */
4516 type
= bt1
== VT_STRUCT
? type1
: type2
;
4517 } else if (bt1
== VT_VOID
|| bt2
== VT_VOID
) {
4518 /* NOTE: as an extension, we accept void on only one side */
4521 /* integer operations */
4523 /* convert to unsigned if it does not fit in an integer */
4524 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
4525 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
4526 type
.t
|= VT_UNSIGNED
;
4529 /* now we convert second operand */
4531 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4534 if (is_float(type
.t
)) {
4536 #ifdef TCC_TARGET_X86_64
4537 if ((type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4541 } else if ((type
.t
& VT_BTYPE
) == VT_LLONG
) {
4542 /* for long longs, we use fixed registers to avoid having
4543 to handle a complicated move */
4548 /* this is horrible, but we must also convert first
4552 /* put again first value and cast it */
4555 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4558 move_reg(r2
, r1
, type
.t
);
4565 static void expr_eq(void)
4571 (tok
>= TOK_A_MOD
&& tok
<= TOK_A_DIV
) ||
4572 tok
== TOK_A_XOR
|| tok
== TOK_A_OR
||
4573 tok
== TOK_A_SHL
|| tok
== TOK_A_SAR
) {
4588 ST_FUNC
void gexpr(void)
4599 /* parse an expression and return its type without any side effect. */
4600 static void expr_type(CType
*type
)
4602 int saved_nocode_wanted
;
4604 saved_nocode_wanted
= nocode_wanted
;
4609 nocode_wanted
= saved_nocode_wanted
;
4612 /* parse a unary expression and return its type without any side
4614 static void unary_type(CType
*type
)
4626 /* parse a constant expression and return value in vtop. */
4627 static void expr_const1(void)
4636 /* parse an integer constant and return its value. */
4637 ST_FUNC
int expr_const(void)
4641 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
4642 expect("constant expression");
4648 /* return the label token if current token is a label, otherwise
4650 static int is_label(void)
4654 /* fast test first */
4655 if (tok
< TOK_UIDENT
)
4657 /* no need to save tokc because tok is an identifier */
4664 unget_tok(last_tok
);
4669 static void label_or_decl(int l
)
4673 /* fast test first */
4674 if (tok
>= TOK_UIDENT
)
4676 /* no need to save tokc because tok is an identifier */
4680 unget_tok(last_tok
);
4683 unget_tok(last_tok
);
4688 static void block(int *bsym
, int *csym
, int *case_sym
, int *def_sym
,
4689 int case_reg
, int is_expr
)
4692 Sym
*s
, *frame_bottom
;
4694 /* generate line number info */
4695 if (tcc_state
->do_debug
&&
4696 (last_line_num
!= file
->line_num
|| last_ind
!= ind
)) {
4697 put_stabn(N_SLINE
, 0, file
->line_num
, ind
- func_ind
);
4699 last_line_num
= file
->line_num
;
4703 /* default return value is (void) */
4705 vtop
->type
.t
= VT_VOID
;
4708 if (tok
== TOK_IF
) {
4715 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4717 if (c
== TOK_ELSE
) {
4721 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4722 gsym(d
); /* patch else jmp */
4725 } else if (tok
== TOK_WHILE
) {
4733 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4737 } else if (tok
== '{') {
4739 int block_vla_sp_loc
, *saved_vla_sp_loc
, saved_vla_flags
;
4742 /* record local declaration stack position */
4744 frame_bottom
= sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
4745 frame_bottom
->next
= scope_stack_bottom
;
4746 scope_stack_bottom
= frame_bottom
;
4747 llabel
= local_label_stack
;
4749 /* save VLA state */
4750 block_vla_sp_loc
= *(saved_vla_sp_loc
= vla_sp_loc
);
4751 if (saved_vla_sp_loc
!= &vla_sp_root_loc
)
4752 vla_sp_loc
= &block_vla_sp_loc
;
4754 saved_vla_flags
= vla_flags
;
4755 vla_flags
|= VLA_NEED_NEW_FRAME
;
4757 /* handle local labels declarations */
4758 if (tok
== TOK_LABEL
) {
4761 if (tok
< TOK_UIDENT
)
4762 expect("label identifier");
4763 label_push(&local_label_stack
, tok
, LABEL_DECLARED
);
4773 while (tok
!= '}') {
4774 label_or_decl(VT_LOCAL
);
4778 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
4781 /* pop locally defined labels */
4782 label_pop(&local_label_stack
, llabel
);
4784 /* XXX: this solution makes only valgrind happy...
4785 triggered by gcc.c-torture/execute/20000917-1.c */
4787 switch(vtop
->type
.t
& VT_BTYPE
) {
4789 /* this breaks a compilation of the linux kernel v2.4.26 */
4790 /* pmd_t *new = ({ __asm__ __volatile__("ud2\n") ; ((pmd_t *)1); }); */
4791 /* Look a commit a80acab: Display error on statement expressions with complex return type */
4792 /* A pointer is not a complex return type */
4796 for(p
=vtop
->type
.ref
;p
;p
=p
->prev
)
4798 tcc_error("unsupported expression type");
4801 /* pop locally defined symbols */
4802 scope_stack_bottom
= scope_stack_bottom
->next
;
4803 sym_pop(&local_stack
, s
);
4805 /* Pop VLA frames and restore stack pointer if required */
4806 if (saved_vla_sp_loc
!= &vla_sp_root_loc
)
4807 *saved_vla_sp_loc
= block_vla_sp_loc
;
4808 if (vla_sp_loc
!= (saved_vla_sp_loc
== &vla_sp_root_loc
? &vla_sp_root_loc
: &block_vla_sp_loc
)) {
4809 vla_sp_loc
= saved_vla_sp_loc
;
4810 gen_vla_sp_restore(*vla_sp_loc
);
4812 vla_flags
= (vla_flags
& ~VLA_SCOPE_FLAGS
) | (saved_vla_flags
& VLA_SCOPE_FLAGS
);
4815 } else if (tok
== TOK_RETURN
) {
4819 gen_assign_cast(&func_vt
);
4820 #ifdef TCC_TARGET_ARM64
4821 // Perhaps it would be better to use this for all backends:
4824 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
4825 CType type
, ret_type
;
4826 int ret_align
, ret_nregs
;
4827 ret_nregs
= gfunc_sret(&func_vt
, func_var
, &ret_type
,
4829 if (0 == ret_nregs
) {
4830 /* if returning structure, must copy it to implicit
4831 first pointer arg location */
4834 vset(&type
, VT_LOCAL
| VT_LVAL
, func_vc
);
4837 /* copy structure value to pointer */
4840 /* returning structure packed into registers */
4841 int r
, size
, addr
, align
;
4842 size
= type_size(&func_vt
,&align
);
4843 if ((vtop
->r
!= (VT_LOCAL
| VT_LVAL
) || (vtop
->c
.i
& (ret_align
-1)))
4844 && (align
& (ret_align
-1))) {
4845 loc
= (loc
- size
) & -align
;
4848 vset(&type
, VT_LOCAL
| VT_LVAL
, addr
);
4851 vset(&ret_type
, VT_LOCAL
| VT_LVAL
, addr
);
4853 vtop
->type
= ret_type
;
4854 if (is_float(ret_type
.t
))
4855 r
= rc_fret(ret_type
.t
);
4861 if (--ret_nregs
== 0)
4863 /* We assume that when a structure is returned in multiple
4864 registers, their classes are consecutive values of the
4867 /* XXX: compatible with arm only: ret_align == register_size */
4868 vtop
->c
.i
+= ret_align
;
4869 vtop
->r
= VT_LOCAL
| VT_LVAL
;
4872 } else if (is_float(func_vt
.t
)) {
4873 gv(rc_fret(func_vt
.t
));
4878 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
4881 rsym
= gjmp(rsym
); /* jmp */
4882 } else if (tok
== TOK_BREAK
) {
4885 tcc_error("cannot break");
4886 *bsym
= gjmp(*bsym
);
4889 } else if (tok
== TOK_CONTINUE
) {
4892 tcc_error("cannot continue");
4893 *csym
= gjmp(*csym
);
4896 } else if (tok
== TOK_FOR
) {
4901 frame_bottom
= sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
4902 frame_bottom
->next
= scope_stack_bottom
;
4903 scope_stack_bottom
= frame_bottom
;
4905 /* c99 for-loop init decl? */
4906 if (!decl0(VT_LOCAL
, 1)) {
4907 /* no, regular for-loop init expr */
4931 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4935 scope_stack_bottom
= scope_stack_bottom
->next
;
4936 sym_pop(&local_stack
, s
);
4938 if (tok
== TOK_DO
) {
4943 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4954 if (tok
== TOK_SWITCH
) {
4958 /* XXX: other types than integer */
4959 case_reg
= gv(RC_INT
);
4963 b
= gjmp(0); /* jump to first case */
4965 block(&a
, csym
, &b
, &c
, case_reg
, 0);
4966 /* if no default, jmp after switch */
4974 if (tok
== TOK_CASE
) {
4981 if (gnu_ext
&& tok
== TOK_DOTS
) {
4985 tcc_warning("empty case range");
4987 /* since a case is like a label, we must skip it with a jmp */
4995 *case_sym
= gtst(1, 0);
4998 *case_sym
= gtst(1, 0);
5002 *case_sym
= gtst(1, *case_sym
);
5004 case_reg
= gv(RC_INT
);
5009 goto block_after_label
;
5011 if (tok
== TOK_DEFAULT
) {
5017 tcc_error("too many 'default'");
5020 goto block_after_label
;
5022 if (tok
== TOK_GOTO
) {
5024 if (tok
== '*' && gnu_ext
) {
5028 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
)
5031 } else if (tok
>= TOK_UIDENT
) {
5032 s
= label_find(tok
);
5033 /* put forward definition if needed */
5035 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
5037 if (s
->r
== LABEL_DECLARED
)
5038 s
->r
= LABEL_FORWARD
;
5040 /* label already defined */
5041 if (vla_flags
& VLA_IN_SCOPE
) {
5042 /* If VLAs are in use, save the current stack pointer and
5043 reset the stack pointer to what it was at function entry
5044 (label will restore stack pointer in inner scopes) */
5046 gen_vla_sp_restore(vla_sp_root_loc
);
5048 if (s
->r
& LABEL_FORWARD
)
5049 s
->jnext
= gjmp(s
->jnext
);
5051 gjmp_addr(s
->jnext
);
5054 expect("label identifier");
5057 } else if (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
) {
5063 if (vla_flags
& VLA_IN_SCOPE
) {
5064 /* save/restore stack pointer across label
5065 this is a no-op when combined with the load immediately
5066 after the label unless we arrive via goto */
5071 if (s
->r
== LABEL_DEFINED
)
5072 tcc_error("duplicate label '%s'", get_tok_str(s
->v
, NULL
));
5074 s
->r
= LABEL_DEFINED
;
5076 s
= label_push(&global_label_stack
, b
, LABEL_DEFINED
);
5079 if (vla_flags
& VLA_IN_SCOPE
) {
5080 gen_vla_sp_restore(*vla_sp_loc
);
5081 vla_flags
|= VLA_NEED_NEW_FRAME
;
5083 /* we accept this, but it is a mistake */
5086 tcc_warning("deprecated use of label at end of compound statement");
5090 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
5093 /* expression case */
5108 /* t is the array or struct type. c is the array or struct
5109 address. cur_index/cur_field is the pointer to the current
5110 value. 'size_only' is true if only size info is needed (only used
5112 static void decl_designator(CType
*type
, Section
*sec
, unsigned long c
,
5113 int *cur_index
, Sym
**cur_field
,
5114 int size_only
, int *par_count_p
)
5117 int notfirst
, index
, index_last
, align
, l
, nb_elems
, elem_size
;
5123 if (gnu_ext
&& (l
= is_label()) != 0)
5125 while (tok
== '[' || tok
== '.') {
5127 if (!(type
->t
& VT_ARRAY
))
5128 expect("array type");
5131 index
= expr_const();
5132 if (index
< 0 || (s
->c
>= 0 && index
>= s
->c
))
5133 expect("invalid index");
5134 if (tok
== TOK_DOTS
&& gnu_ext
) {
5136 index_last
= expr_const();
5137 if (index_last
< 0 ||
5138 (s
->c
>= 0 && index_last
>= s
->c
) ||
5140 expect("invalid index");
5146 *cur_index
= index_last
;
5147 type
= pointed_type(type
);
5148 elem_size
= type_size(type
, &align
);
5149 c
+= index
* elem_size
;
5150 /* NOTE: we only support ranges for last designator */
5151 nb_elems
= index_last
- index
+ 1;
5152 if (nb_elems
!= 1) {
5161 if ((type
->t
& VT_BTYPE
) != VT_STRUCT
)
5162 expect("struct/union type");
5175 /* XXX: fix this mess by using explicit storage field */
5177 type1
.t
|= (type
->t
& ~VT_TYPE
);
5191 if (type
->t
& VT_ARRAY
) {
5193 type
= pointed_type(type
);
5194 c
+= index
* type_size(type
, &align
);
5198 tcc_error("too many field init");
5199 /* XXX: fix this mess by using explicit storage field */
5201 type1
.t
|= (type
->t
& ~VT_TYPE
);
5206 decl_initializer(type
, sec
, c
, 0, size_only
, par_count_p
);
5208 /* XXX: make it more general */
5209 if (!size_only
&& nb_elems
> 1) {
5210 unsigned long c_end
;
5215 tcc_error("range init not supported yet for dynamic storage");
5216 c_end
= c
+ nb_elems
* elem_size
;
5217 if (c_end
> sec
->data_allocated
)
5218 section_realloc(sec
, c_end
);
5219 src
= sec
->data
+ c
;
5221 for(i
= 1; i
< nb_elems
; i
++) {
5223 memcpy(dst
, src
, elem_size
);
5229 #define EXPR_CONST 1
5232 /* store a value or an expression directly in global data or in local array */
5233 static void init_putv(CType
*type
, Section
*sec
, unsigned long c
,
5234 int v
, int expr_type
)
5236 int saved_global_expr
, bt
, bit_pos
, bit_size
;
5238 unsigned long long bit_mask
;
5246 /* compound literals must be allocated globally in this case */
5247 saved_global_expr
= global_expr
;
5250 global_expr
= saved_global_expr
;
5251 /* NOTE: symbols are accepted */
5252 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) != VT_CONST
)
5253 tcc_error("initializer element is not constant");
5261 dtype
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
5264 /* XXX: not portable */
5265 /* XXX: generate error if incorrect relocation */
5266 gen_assign_cast(&dtype
);
5267 bt
= type
->t
& VT_BTYPE
;
5268 /* we'll write at most 16 bytes */
5269 if (c
+ 16 > sec
->data_allocated
) {
5270 section_realloc(sec
, c
+ 16);
5272 ptr
= sec
->data
+ c
;
5273 /* XXX: make code faster ? */
5274 if (!(type
->t
& VT_BITFIELD
)) {
5279 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5280 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
5281 bit_mask
= (1LL << bit_size
) - 1;
5283 if ((vtop
->r
& VT_SYM
) &&
5289 (bt
== VT_INT
&& bit_size
!= 32)))
5290 tcc_error("initializer element is not computable at load time");
5292 /* XXX: when cross-compiling we assume that each type has the
5293 same representation on host and target, which is likely to
5294 be wrong in the case of long double */
5296 vtop
->c
.i
= (vtop
->c
.i
!= 0);
5298 *(char *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5301 *(short *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5304 *(double *)ptr
= vtop
->c
.d
;
5307 *(long double *)ptr
= vtop
->c
.ld
;
5310 *(long long *)ptr
|= (vtop
->c
.ll
& bit_mask
) << bit_pos
;
5313 addr_t val
= (vtop
->c
.ptr_offset
& bit_mask
) << bit_pos
;
5314 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
5315 if (vtop
->r
& VT_SYM
)
5316 greloca(sec
, vtop
->sym
, c
, R_DATA_PTR
, val
);
5318 *(addr_t
*)ptr
|= val
;
5320 if (vtop
->r
& VT_SYM
)
5321 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
5322 *(addr_t
*)ptr
|= val
;
5327 int val
= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5328 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
5329 if (vtop
->r
& VT_SYM
)
5330 greloca(sec
, vtop
->sym
, c
, R_DATA_PTR
, val
);
5334 if (vtop
->r
& VT_SYM
)
5335 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
5343 vset(&dtype
, VT_LOCAL
|VT_LVAL
, c
);
5350 /* put zeros for variable based init */
5351 static void init_putz(CType
*t
, Section
*sec
, unsigned long c
, int size
)
5354 /* nothing to do because globals are already set to zero */
5356 vpush_global_sym(&func_old_type
, TOK_memset
);
5358 #ifdef TCC_TARGET_ARM
5369 /* 't' contains the type and storage info. 'c' is the offset of the
5370 object in section 'sec'. If 'sec' is NULL, it means stack based
5371 allocation. 'first' is true if array '{' must be read (multi
5372 dimension implicit array init handling). 'size_only' is true if
5373 size only evaluation is wanted (only for arrays). */
5374 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
,
5375 int first
, int size_only
, int *par_count_p
)
5377 int index
, array_length
, n
, no_oblock
, nb
, parlevel
, parlevel1
, i
;
5378 int size1
, align1
, expr_type
;
5382 if (type
->t
& VT_VLA
) {
5385 /* save current stack pointer */
5386 if (vla_flags
& VLA_NEED_NEW_FRAME
) {
5388 vla_flags
= VLA_IN_SCOPE
;
5389 vla_sp_loc
= &vla_sp_loc_tmp
;
5392 vla_runtime_type_size(type
, &a
);
5393 gen_vla_alloc(type
, a
);
5394 vset(type
, VT_LOCAL
|VT_LVAL
, c
);
5398 } else if (type
->t
& VT_ARRAY
) {
5402 t1
= pointed_type(type
);
5403 size1
= type_size(t1
, &align1
);
5406 if ((first
&& tok
!= TOK_LSTR
&& tok
!= TOK_STR
) ||
5409 tcc_error("character array initializer must be a literal,"
5410 " optionally enclosed in braces");
5415 /* only parse strings here if correct type (otherwise: handle
5416 them as ((w)char *) expressions */
5417 if ((tok
== TOK_LSTR
&&
5418 #ifdef TCC_TARGET_PE
5419 (t1
->t
& VT_BTYPE
) == VT_SHORT
&& (t1
->t
& VT_UNSIGNED
)
5421 (t1
->t
& VT_BTYPE
) == VT_INT
5423 ) || (tok
== TOK_STR
&& (t1
->t
& VT_BTYPE
) == VT_BYTE
)) {
5424 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5429 /* compute maximum number of chars wanted */
5431 cstr_len
= cstr
->size
;
5433 cstr_len
= cstr
->size
/ sizeof(nwchar_t
);
5436 if (n
>= 0 && nb
> (n
- array_length
))
5437 nb
= n
- array_length
;
5440 tcc_warning("initializer-string for array is too long");
5441 /* in order to go faster for common case (char
5442 string in global variable, we handle it
5444 if (sec
&& tok
== TOK_STR
&& size1
== 1) {
5445 memcpy(sec
->data
+ c
+ array_length
, cstr
->data
, nb
);
5449 ch
= ((unsigned char *)cstr
->data
)[i
];
5451 ch
= ((nwchar_t
*)cstr
->data
)[i
];
5452 init_putv(t1
, sec
, c
+ (array_length
+ i
) * size1
,
5460 /* only add trailing zero if enough storage (no
5461 warning in this case since it is standard) */
5462 if (n
< 0 || array_length
< n
) {
5464 init_putv(t1
, sec
, c
+ (array_length
* size1
), 0, EXPR_VAL
);
5470 while (tok
!= '}') {
5471 decl_designator(type
, sec
, c
, &index
, NULL
, size_only
, par_count_p
);
5472 if (n
>= 0 && index
>= n
)
5473 tcc_error("index too large");
5474 /* must put zero in holes (note that doing it that way
5475 ensures that it even works with designators) */
5476 if (!size_only
&& array_length
< index
) {
5477 init_putz(t1
, sec
, c
+ array_length
* size1
,
5478 (index
- array_length
) * size1
);
5481 if (index
> array_length
)
5482 array_length
= index
;
5483 /* special test for multi dimensional arrays (may not
5484 be strictly correct if designators are used at the
5486 if (index
>= n
&& no_oblock
)
5488 if (*par_count_p
!= 0 && tok
== ')') {
5499 /* put zeros at the end */
5500 if (!size_only
&& n
>= 0 && array_length
< n
) {
5501 init_putz(t1
, sec
, c
+ array_length
* size1
,
5502 (n
- array_length
) * size1
);
5504 /* patch type size if needed */
5506 s
->c
= array_length
;
5507 } else if ((type
->t
& VT_BTYPE
) == VT_STRUCT
&&
5508 (sec
|| !first
|| tok
== '{')) {
5511 /* NOTE: the previous test is a specific case for automatic
5512 struct/union init */
5513 /* XXX: union needs only one init */
5515 /* XXX: this test is incorrect for local initializers
5516 beginning with ( without {. It would be much more difficult
5517 to do it correctly (ideally, the expression parser should
5518 be used in all cases) */
5524 while (tok
== '(') {
5528 if (!parse_btype(&type1
, &ad1
))
5530 type_decl(&type1
, &ad1
, &n
, TYPE_ABSTRACT
);
5532 if (!is_assignable_types(type
, &type1
))
5533 tcc_error("invalid type for cast");
5538 if (first
|| tok
== '{') {
5547 while (tok
!= '}') {
5548 decl_designator(type
, sec
, c
, NULL
, &f
, size_only
, &par_count
);
5550 if (!size_only
&& array_length
< index
) {
5551 init_putz(type
, sec
, c
+ array_length
,
5552 index
- array_length
);
5554 index
= index
+ type_size(&f
->type
, &align1
);
5555 if (index
> array_length
)
5556 array_length
= index
;
5558 /* gr: skip fields from same union - ugly. */
5561 int f_size
= type_size(&f
->type
, &align
);
5562 int f_type
= (f
->type
.t
& VT_BTYPE
);
5564 ///printf("index: %2d %08x -- %2d %08x\n", f->c, f->type.t, f->next->c, f->next->type.t);
5565 /* test for same offset */
5566 if (f
->next
->c
!= f
->c
)
5568 if ((f_type
== VT_STRUCT
) && (f_size
== 0)) {
5570 Lets assume a structure of size 0 can't be a member of the union.
5571 This allow to compile the following code from a linux kernel v2.4.26
5572 typedef struct { } rwlock_t;
5578 struct fs_struct init_fs = { { (1) }, (rwlock_t) {}, 0022, };
5579 tcc-0.9.23 can succesfully compile this version of the kernel.
5580 gcc don't have problems with this code too.
5584 /* if yes, test for bitfield shift */
5585 if ((f
->type
.t
& VT_BITFIELD
) && (f
->next
->type
.t
& VT_BITFIELD
)) {
5586 int bit_pos_1
= (f
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5587 int bit_pos_2
= (f
->next
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5588 //printf("bitfield %d %d\n", bit_pos_1, bit_pos_2);
5589 if (bit_pos_1
!= bit_pos_2
)
5596 if (no_oblock
&& f
== NULL
)
5602 /* put zeros at the end */
5603 if (!size_only
&& array_length
< n
) {
5604 init_putz(type
, sec
, c
+ array_length
,
5613 } else if (tok
== '{') {
5616 decl_initializer(type
, sec
, c
, first
, size_only
, &par_count
);
5618 } else if (size_only
) {
5619 /* just skip expression */
5620 parlevel
= parlevel1
= 0;
5621 while ((parlevel
> 0 || parlevel1
> 0 ||
5622 (tok
!= '}' && tok
!= ',')) && tok
!= -1) {
5625 else if (tok
== ')') {
5626 if (parlevel
== 0 && parlevel1
== 0)
5630 else if (tok
== '{')
5632 else if (tok
== '}') {
5633 if (parlevel
== 0 && parlevel1
== 0)
5640 /* currently, we always use constant expression for globals
5641 (may change for scripting case) */
5642 expr_type
= EXPR_CONST
;
5644 expr_type
= EXPR_ANY
;
5645 init_putv(type
, sec
, c
, 0, expr_type
);
5649 /* parse an initializer for type 't' if 'has_init' is non zero, and
5650 allocate space in local or global data space ('r' is either
5651 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
5652 variable 'v' with an associated name represented by 'asm_label' of
5653 scope 'scope' is declared before initializers are parsed. If 'v' is
5654 zero, then a reference to the new object is put in the value stack.
5655 If 'has_init' is 2, a special parsing is done to handle string
5657 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
,
5658 int has_init
, int v
, char *asm_label
,
5661 int size
, align
, addr
, data_offset
;
5663 ParseState saved_parse_state
= {0};
5664 TokenString init_str
;
5666 Sym
*flexible_array
;
5668 flexible_array
= NULL
;
5669 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
5670 Sym
*field
= type
->ref
->next
;
5673 field
= field
->next
;
5674 if (field
->type
.t
& VT_ARRAY
&& field
->type
.ref
->c
< 0)
5675 flexible_array
= field
;
5679 size
= type_size(type
, &align
);
5680 /* If unknown size, we must evaluate it before
5681 evaluating initializers because
5682 initializers can generate global data too
5683 (e.g. string pointers or ISOC99 compound
5684 literals). It also simplifies local
5685 initializers handling */
5686 tok_str_new(&init_str
);
5687 if (size
< 0 || (flexible_array
&& has_init
)) {
5690 tcc_error("unknown type size");
5691 /* get all init string */
5692 if (has_init
== 2) {
5693 /* only get strings */
5694 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5695 tok_str_add_tok(&init_str
);
5700 while (level
> 0 || (tok
!= ',' && tok
!= ';')) {
5702 tcc_error("unexpected end of file in initializer");
5703 tok_str_add_tok(&init_str
);
5706 else if (tok
== '}') {
5716 tok_str_add(&init_str
, -1);
5717 tok_str_add(&init_str
, 0);
5720 save_parse_state(&saved_parse_state
);
5722 macro_ptr
= init_str
.str
;
5724 decl_initializer(type
, NULL
, 0, 1, 1, &par_count
);
5725 /* prepare second initializer parsing */
5726 macro_ptr
= init_str
.str
;
5729 /* if still unknown size, error */
5730 size
= type_size(type
, &align
);
5732 tcc_error("unknown type size");
5735 size
+= flexible_array
->type
.ref
->c
* pointed_size(&flexible_array
->type
);
5736 /* take into account specified alignment if bigger */
5737 if (ad
->a
.aligned
) {
5738 if (ad
->a
.aligned
> align
)
5739 align
= ad
->a
.aligned
;
5740 } else if (ad
->a
.packed
) {
5743 if ((r
& VT_VALMASK
) == VT_LOCAL
) {
5745 #ifdef CONFIG_TCC_BCHECK
5746 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5750 loc
= (loc
- size
) & -align
;
5752 #ifdef CONFIG_TCC_BCHECK
5753 /* handles bounds */
5754 /* XXX: currently, since we do only one pass, we cannot track
5755 '&' operators, so we add only arrays */
5756 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5757 unsigned long *bounds_ptr
;
5758 /* add padding between regions */
5760 /* then add local bound info */
5761 bounds_ptr
= section_ptr_add(lbounds_section
, 2 * sizeof(unsigned long));
5762 bounds_ptr
[0] = addr
;
5763 bounds_ptr
[1] = size
;
5767 /* local variable */
5768 sym_push(v
, type
, r
, addr
);
5770 /* push local reference */
5771 vset(type
, r
, addr
);
5777 if (v
&& scope
== VT_CONST
) {
5778 /* see if the symbol was already defined */
5781 if (!is_compatible_types(&sym
->type
, type
))
5782 tcc_error("incompatible types for redefinition of '%s'",
5783 get_tok_str(v
, NULL
));
5784 if (sym
->type
.t
& VT_EXTERN
) {
5785 /* if the variable is extern, it was not allocated */
5786 sym
->type
.t
&= ~VT_EXTERN
;
5787 /* set array size if it was omitted in extern
5789 if ((sym
->type
.t
& VT_ARRAY
) &&
5790 sym
->type
.ref
->c
< 0 &&
5792 sym
->type
.ref
->c
= type
->ref
->c
;
5794 /* we accept several definitions of the same
5795 global variable. this is tricky, because we
5796 must play with the SHN_COMMON type of the symbol */
5797 /* XXX: should check if the variable was already
5798 initialized. It is incorrect to initialized it
5800 /* no init data, we won't add more to the symbol */
5807 /* allocate symbol in corresponding section */
5812 else if (tcc_state
->nocommon
)
5816 data_offset
= sec
->data_offset
;
5817 data_offset
= (data_offset
+ align
- 1) & -align
;
5819 /* very important to increment global pointer at this time
5820 because initializers themselves can create new initializers */
5821 data_offset
+= size
;
5822 #ifdef CONFIG_TCC_BCHECK
5823 /* add padding if bound check */
5824 if (tcc_state
->do_bounds_check
)
5827 sec
->data_offset
= data_offset
;
5828 /* allocate section space to put the data */
5829 if (sec
->sh_type
!= SHT_NOBITS
&&
5830 data_offset
> sec
->data_allocated
)
5831 section_realloc(sec
, data_offset
);
5832 /* align section if needed */
5833 if (align
> sec
->sh_addralign
)
5834 sec
->sh_addralign
= align
;
5836 addr
= 0; /* avoid warning */
5840 if (scope
!= VT_CONST
|| !sym
) {
5841 sym
= sym_push(v
, type
, r
| VT_SYM
, 0);
5842 sym
->asm_label
= asm_label
;
5844 /* update symbol definition */
5846 put_extern_sym(sym
, sec
, addr
, size
);
5849 /* put a common area */
5850 put_extern_sym(sym
, NULL
, align
, size
);
5851 /* XXX: find a nicer way */
5852 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
5853 esym
->st_shndx
= SHN_COMMON
;
5856 /* push global reference */
5857 sym
= get_sym_ref(type
, sec
, addr
, size
);
5858 vpushsym(type
, sym
);
5860 /* patch symbol weakness */
5861 if (type
->t
& VT_WEAK
)
5863 apply_visibility(sym
, type
);
5864 #ifdef CONFIG_TCC_BCHECK
5865 /* handles bounds now because the symbol must be defined
5866 before for the relocation */
5867 if (tcc_state
->do_bounds_check
) {
5868 unsigned long *bounds_ptr
;
5870 greloc(bounds_section
, sym
, bounds_section
->data_offset
, R_DATA_PTR
);
5871 /* then add global bound info */
5872 bounds_ptr
= section_ptr_add(bounds_section
, 2 * sizeof(long));
5873 bounds_ptr
[0] = 0; /* relocated */
5874 bounds_ptr
[1] = size
;
5878 if (has_init
|| (type
->t
& VT_VLA
)) {
5880 decl_initializer(type
, sec
, addr
, 1, 0, &par_count
);
5881 /* restore parse state if needed */
5883 tok_str_free(init_str
.str
);
5884 restore_parse_state(&saved_parse_state
);
5886 /* patch flexible array member size back to -1, */
5887 /* for possible subsequent similar declarations */
5889 flexible_array
->type
.ref
->c
= -1;
5894 static void put_func_debug(Sym
*sym
)
5899 /* XXX: we put here a dummy type */
5900 snprintf(buf
, sizeof(buf
), "%s:%c1",
5901 funcname
, sym
->type
.t
& VT_STATIC
? 'f' : 'F');
5902 put_stabs_r(buf
, N_FUN
, 0, file
->line_num
, 0,
5903 cur_text_section
, sym
->c
);
5904 /* //gr gdb wants a line at the function */
5905 put_stabn(N_SLINE
, 0, file
->line_num
, 0);
5910 /* parse an old style function declaration list */
5911 /* XXX: check multiple parameter */
5912 static void func_decl_list(Sym
*func_sym
)
5919 /* parse each declaration */
5920 while (tok
!= '{' && tok
!= ';' && tok
!= ',' && tok
!= TOK_EOF
&&
5921 tok
!= TOK_ASM1
&& tok
!= TOK_ASM2
&& tok
!= TOK_ASM3
) {
5922 if (!parse_btype(&btype
, &ad
))
5923 expect("declaration list");
5924 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
5925 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
5927 /* we accept no variable after */
5931 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
5932 /* find parameter in function parameter list */
5935 if ((s
->v
& ~SYM_FIELD
) == v
)
5939 tcc_error("declaration for parameter '%s' but no such parameter",
5940 get_tok_str(v
, NULL
));
5942 /* check that no storage specifier except 'register' was given */
5943 if (type
.t
& VT_STORAGE
)
5944 tcc_error("storage class specified for '%s'", get_tok_str(v
, NULL
));
5945 convert_parameter_type(&type
);
5946 /* we can add the type (NOTE: it could be local to the function) */
5948 /* accept other parameters */
5959 /* parse a function defined by symbol 'sym' and generate its code in
5960 'cur_text_section' */
5961 static void gen_function(Sym
*sym
)
5963 int saved_nocode_wanted
= nocode_wanted
;
5965 ind
= cur_text_section
->data_offset
;
5966 /* NOTE: we patch the symbol size later */
5967 put_extern_sym(sym
, cur_text_section
, ind
, 0);
5968 funcname
= get_tok_str(sym
->v
, NULL
);
5970 /* Initialize VLA state */
5971 vla_sp_loc
= &vla_sp_root_loc
;
5972 vla_flags
= VLA_NEED_NEW_FRAME
;
5973 /* put debug symbol */
5974 if (tcc_state
->do_debug
)
5975 put_func_debug(sym
);
5976 /* push a dummy symbol to enable local sym storage */
5977 sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
5978 gfunc_prolog(&sym
->type
);
5979 #ifdef CONFIG_TCC_BCHECK
5980 if (tcc_state
->do_bounds_check
5981 && !strcmp(get_tok_str(sym
->v
, NULL
), "main")) {
5985 for (i
= 0, sym
= local_stack
; i
< 2; i
++, sym
= sym
->prev
) {
5986 if (sym
->v
& SYM_FIELD
|| sym
->prev
->v
& SYM_FIELD
)
5988 vpush_global_sym(&func_old_type
, TOK___bound_main_arg
);
5989 vset(&sym
->type
, sym
->r
, sym
->c
);
5995 block(NULL
, NULL
, NULL
, NULL
, 0, 0);
5998 cur_text_section
->data_offset
= ind
;
5999 label_pop(&global_label_stack
, NULL
);
6000 /* reset local stack */
6001 scope_stack_bottom
= NULL
;
6002 sym_pop(&local_stack
, NULL
);
6003 /* end of function */
6004 /* patch symbol size */
6005 ((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
].st_size
=
6007 /* patch symbol weakness (this definition overrules any prototype) */
6008 if (sym
->type
.t
& VT_WEAK
)
6010 apply_visibility(sym
, &sym
->type
);
6011 if (tcc_state
->do_debug
) {
6012 put_stabn(N_FUN
, 0, 0, ind
- func_ind
);
6014 /* It's better to crash than to generate wrong code */
6015 cur_text_section
= NULL
;
6016 funcname
= ""; /* for safety */
6017 func_vt
.t
= VT_VOID
; /* for safety */
6018 func_var
= 0; /* for safety */
6019 ind
= 0; /* for safety */
6020 nocode_wanted
= saved_nocode_wanted
;
6023 ST_FUNC
void gen_inline_functions(void)
6026 int *str
, inline_generated
, i
;
6027 struct InlineFunc
*fn
;
6029 /* iterate while inline function are referenced */
6031 inline_generated
= 0;
6032 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
6033 fn
= tcc_state
->inline_fns
[i
];
6035 if (sym
&& sym
->c
) {
6036 /* the function was used: generate its code and
6037 convert it to a normal function */
6038 str
= fn
->token_str
;
6041 pstrcpy(file
->filename
, sizeof file
->filename
, fn
->filename
);
6042 sym
->r
= VT_SYM
| VT_CONST
;
6043 sym
->type
.t
&= ~VT_INLINE
;
6047 cur_text_section
= text_section
;
6049 macro_ptr
= NULL
; /* fail safe */
6051 inline_generated
= 1;
6054 if (!inline_generated
)
6057 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
6058 fn
= tcc_state
->inline_fns
[i
];
6059 str
= fn
->token_str
;
6062 dynarray_reset(&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
);
6065 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
6066 static int decl0(int l
, int is_for_loop_init
)
6074 if (!parse_btype(&btype
, &ad
)) {
6075 if (is_for_loop_init
)
6077 /* skip redundant ';' */
6078 /* XXX: find more elegant solution */
6083 if (l
== VT_CONST
&&
6084 (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
6085 /* global asm block */
6089 /* special test for old K&R protos without explicit int
6090 type. Only accepted when defining global data */
6091 if (l
== VT_LOCAL
|| tok
< TOK_DEFINE
)
6095 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
6096 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
6098 /* we accept no variable after */
6102 while (1) { /* iterate thru each declaration */
6103 char *asm_label
; // associated asm label
6105 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
6109 type_to_str(buf
, sizeof(buf
), t
, get_tok_str(v
, NULL
));
6110 printf("type = '%s'\n", buf
);
6113 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
6114 if ((type
.t
& VT_STATIC
) && (l
== VT_LOCAL
)) {
6115 tcc_error("function without file scope cannot be static");
6117 /* if old style function prototype, we accept a
6120 if (sym
->c
== FUNC_OLD
)
6121 func_decl_list(sym
);
6125 if (gnu_ext
&& (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
6128 asm_label_instr(&astr
);
6129 asm_label
= tcc_strdup(astr
.data
);
6132 /* parse one last attribute list, after asm label */
6133 parse_attribute(&ad
);
6138 #ifdef TCC_TARGET_PE
6139 if (ad
.a
.func_import
)
6140 type
.t
|= VT_IMPORT
;
6141 if (ad
.a
.func_export
)
6142 type
.t
|= VT_EXPORT
;
6144 type
.t
|= ad
.a
.visibility
<< VT_VIS_SHIFT
;
6148 tcc_error("cannot use local functions");
6149 if ((type
.t
& VT_BTYPE
) != VT_FUNC
)
6150 expect("function definition");
6152 /* reject abstract declarators in function definition */
6154 while ((sym
= sym
->next
) != NULL
)
6155 if (!(sym
->v
& ~SYM_FIELD
))
6156 expect("identifier");
6158 /* XXX: cannot do better now: convert extern line to static inline */
6159 if ((type
.t
& (VT_EXTERN
| VT_INLINE
)) == (VT_EXTERN
| VT_INLINE
))
6160 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
6165 if ((sym
->type
.t
& VT_BTYPE
) != VT_FUNC
)
6168 ref
= sym
->type
.ref
;
6169 if (0 == ref
->a
.func_proto
)
6170 tcc_error("redefinition of '%s'", get_tok_str(v
, NULL
));
6172 /* use func_call from prototype if not defined */
6173 if (ref
->a
.func_call
!= FUNC_CDECL
6174 && type
.ref
->a
.func_call
== FUNC_CDECL
)
6175 type
.ref
->a
.func_call
= ref
->a
.func_call
;
6177 /* use export from prototype */
6178 if (ref
->a
.func_export
)
6179 type
.ref
->a
.func_export
= 1;
6181 /* use static from prototype */
6182 if (sym
->type
.t
& VT_STATIC
)
6183 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
6185 /* If the definition has no visibility use the
6186 one from prototype. */
6187 if (! (type
.t
& VT_VIS_MASK
))
6188 type
.t
|= sym
->type
.t
& VT_VIS_MASK
;
6190 if (!is_compatible_types(&sym
->type
, &type
)) {
6192 tcc_error("incompatible types for redefinition of '%s'",
6193 get_tok_str(v
, NULL
));
6195 type
.ref
->a
.func_proto
= 0;
6196 /* if symbol is already defined, then put complete type */
6199 /* put function symbol */
6200 sym
= global_identifier_push(v
, type
.t
, 0);
6201 sym
->type
.ref
= type
.ref
;
6204 /* static inline functions are just recorded as a kind
6205 of macro. Their code will be emitted at the end of
6206 the compilation unit only if they are used */
6207 if ((type
.t
& (VT_INLINE
| VT_STATIC
)) ==
6208 (VT_INLINE
| VT_STATIC
)) {
6209 TokenString func_str
;
6211 struct InlineFunc
*fn
;
6212 const char *filename
;
6214 tok_str_new(&func_str
);
6220 tcc_error("unexpected end of file");
6221 tok_str_add_tok(&func_str
);
6226 } else if (t
== '}') {
6228 if (block_level
== 0)
6232 tok_str_add(&func_str
, -1);
6233 tok_str_add(&func_str
, 0);
6234 filename
= file
? file
->filename
: "";
6235 fn
= tcc_malloc(sizeof *fn
+ strlen(filename
));
6236 strcpy(fn
->filename
, filename
);
6238 fn
->token_str
= func_str
.str
;
6239 dynarray_add((void ***)&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
, fn
);
6242 /* compute text section */
6243 cur_text_section
= ad
.section
;
6244 if (!cur_text_section
)
6245 cur_text_section
= text_section
;
6246 sym
->r
= VT_SYM
| VT_CONST
;
6251 if (btype
.t
& VT_TYPEDEF
) {
6252 /* save typedefed type */
6253 /* XXX: test storage specifiers ? */
6254 sym
= sym_push(v
, &type
, 0, 0);
6256 sym
->type
.t
|= VT_TYPEDEF
;
6259 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
6260 /* external function definition */
6261 /* specific case for func_call attribute */
6262 ad
.a
.func_proto
= 1;
6264 } else if (!(type
.t
& VT_ARRAY
)) {
6265 /* not lvalue if array */
6266 r
|= lvalue_type(type
.t
);
6268 has_init
= (tok
== '=');
6269 if (has_init
&& (type
.t
& VT_VLA
))
6270 tcc_error("Variable length array cannot be initialized");
6271 if ((btype
.t
& VT_EXTERN
) || ((type
.t
& VT_BTYPE
) == VT_FUNC
) ||
6272 ((type
.t
& VT_ARRAY
) && (type
.t
& VT_STATIC
) &&
6273 !has_init
&& l
== VT_CONST
&& type
.ref
->c
< 0)) {
6274 /* external variable or function */
6275 /* NOTE: as GCC, uninitialized global static
6276 arrays of null size are considered as
6278 sym
= external_sym(v
, &type
, r
, asm_label
);
6280 if (ad
.alias_target
) {
6285 alias_target
= sym_find(ad
.alias_target
);
6286 if (!alias_target
|| !alias_target
->c
)
6287 tcc_error("unsupported forward __alias__ attribute");
6288 esym
= &((Elf32_Sym
*)symtab_section
->data
)[alias_target
->c
];
6289 tsec
.sh_num
= esym
->st_shndx
;
6290 put_extern_sym2(sym
, &tsec
, esym
->st_value
, esym
->st_size
, 0);
6293 type
.t
|= (btype
.t
& VT_STATIC
); /* Retain "static". */
6294 if (type
.t
& VT_STATIC
)
6300 decl_initializer_alloc(&type
, &ad
, r
, has_init
, v
, asm_label
, l
);
6304 if (is_for_loop_init
)
6317 ST_FUNC
void decl(int l
)