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 if (!const_wanted
&&
1481 (op
== TOK_SHL
|| op
== TOK_SHR
|| op
== TOK_SAR
)) ||
1482 (l1
== -1 && op
== TOK_SAR
))) {
1483 /* treat (0 << x), (0 >> x) and (-1 >> x) as constant */
1485 } else if (!const_wanted
&&
1486 c2
&& ((l2
== 0 && (op
== '&' || op
== '*')) ||
1487 (l2
== -1 && op
== '|') ||
1488 (l2
== 0xffffffff && t2
!= VT_LLONG
&& op
== '|') ||
1489 (l2
== 1 && (op
== '%' || op
== TOK_UMOD
)))) {
1490 /* treat (x & 0), (x * 0), (x | -1) and (x % 1) as constant */
1495 } else if (c2
&& (((op
== '*' || op
== '/' || op
== TOK_UDIV
||
1498 ((op
== '+' || op
== '-' || op
== '|' || op
== '^' ||
1499 op
== TOK_SHL
|| op
== TOK_SHR
|| op
== TOK_SAR
) &&
1503 /* filter out NOP operations like x*1, x-0, x&-1... */
1505 } else if (c2
&& (op
== '*' || op
== TOK_PDIV
|| op
== TOK_UDIV
)) {
1506 /* try to use shifts instead of muls or divs */
1507 if (l2
> 0 && (l2
& (l2
- 1)) == 0) {
1516 else if (op
== TOK_PDIV
)
1522 } else if (c2
&& (op
== '+' || op
== '-') &&
1523 (((vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
))
1524 || (vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
)) == VT_LOCAL
)) {
1525 /* symbol + constant case */
1532 if (!nocode_wanted
) {
1533 /* call low level op generator */
1534 if (t1
== VT_LLONG
|| t2
== VT_LLONG
||
1535 (PTR_SIZE
== 8 && (t1
== VT_PTR
|| t2
== VT_PTR
)))
1546 /* generate a floating point operation with constant propagation */
1547 static void gen_opif(int op
)
1555 /* currently, we cannot do computations with forward symbols */
1556 c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1557 c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1559 if (v1
->type
.t
== VT_FLOAT
) {
1562 } else if (v1
->type
.t
== VT_DOUBLE
) {
1570 /* NOTE: we only do constant propagation if finite number (not
1571 NaN or infinity) (ANSI spec) */
1572 if (!ieee_finite(f1
) || !ieee_finite(f2
))
1576 case '+': f1
+= f2
; break;
1577 case '-': f1
-= f2
; break;
1578 case '*': f1
*= f2
; break;
1582 tcc_error("division by zero in constant");
1587 /* XXX: also handles tests ? */
1591 /* XXX: overflow test ? */
1592 if (v1
->type
.t
== VT_FLOAT
) {
1594 } else if (v1
->type
.t
== VT_DOUBLE
) {
1602 if (!nocode_wanted
) {
1610 static int pointed_size(CType
*type
)
1613 return type_size(pointed_type(type
), &align
);
1616 static void vla_runtime_pointed_size(CType
*type
)
1619 vla_runtime_type_size(pointed_type(type
), &align
);
1622 static inline int is_null_pointer(SValue
*p
)
1624 if ((p
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
1626 return ((p
->type
.t
& VT_BTYPE
) == VT_INT
&& p
->c
.i
== 0) ||
1627 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& p
->c
.ll
== 0) ||
1628 ((p
->type
.t
& VT_BTYPE
) == VT_PTR
&& p
->c
.ptr_offset
== 0);
1631 static inline int is_integer_btype(int bt
)
1633 return (bt
== VT_BYTE
|| bt
== VT_SHORT
||
1634 bt
== VT_INT
|| bt
== VT_LLONG
);
1637 /* check types for comparison or subtraction of pointers */
1638 static void check_comparison_pointer_types(SValue
*p1
, SValue
*p2
, int op
)
1640 CType
*type1
, *type2
, tmp_type1
, tmp_type2
;
1643 /* null pointers are accepted for all comparisons as gcc */
1644 if (is_null_pointer(p1
) || is_null_pointer(p2
))
1648 bt1
= type1
->t
& VT_BTYPE
;
1649 bt2
= type2
->t
& VT_BTYPE
;
1650 /* accept comparison between pointer and integer with a warning */
1651 if ((is_integer_btype(bt1
) || is_integer_btype(bt2
)) && op
!= '-') {
1652 if (op
!= TOK_LOR
&& op
!= TOK_LAND
)
1653 tcc_warning("comparison between pointer and integer");
1657 /* both must be pointers or implicit function pointers */
1658 if (bt1
== VT_PTR
) {
1659 type1
= pointed_type(type1
);
1660 } else if (bt1
!= VT_FUNC
)
1661 goto invalid_operands
;
1663 if (bt2
== VT_PTR
) {
1664 type2
= pointed_type(type2
);
1665 } else if (bt2
!= VT_FUNC
) {
1667 tcc_error("invalid operands to binary %s", get_tok_str(op
, NULL
));
1669 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
1670 (type2
->t
& VT_BTYPE
) == VT_VOID
)
1674 tmp_type1
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1675 tmp_type2
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1676 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
1677 /* gcc-like error if '-' is used */
1679 goto invalid_operands
;
1681 tcc_warning("comparison of distinct pointer types lacks a cast");
1685 /* generic gen_op: handles types problems */
1686 ST_FUNC
void gen_op(int op
)
1688 int u
, t1
, t2
, bt1
, bt2
, t
;
1691 t1
= vtop
[-1].type
.t
;
1692 t2
= vtop
[0].type
.t
;
1693 bt1
= t1
& VT_BTYPE
;
1694 bt2
= t2
& VT_BTYPE
;
1696 if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
1697 /* at least one operand is a pointer */
1698 /* relationnal op: must be both pointers */
1699 if (op
>= TOK_ULT
&& op
<= TOK_LOR
) {
1700 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1701 /* pointers are handled are unsigned */
1702 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1703 t
= VT_LLONG
| VT_UNSIGNED
;
1705 t
= VT_INT
| VT_UNSIGNED
;
1709 /* if both pointers, then it must be the '-' op */
1710 if (bt1
== VT_PTR
&& bt2
== VT_PTR
) {
1712 tcc_error("cannot use pointers here");
1713 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1714 /* XXX: check that types are compatible */
1715 if (vtop
[-1].type
.t
& VT_VLA
) {
1716 vla_runtime_pointed_size(&vtop
[-1].type
);
1718 vpushi(pointed_size(&vtop
[-1].type
));
1722 /* set to integer type */
1723 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1724 vtop
->type
.t
= VT_LLONG
;
1726 vtop
->type
.t
= VT_INT
;
1731 /* exactly one pointer : must be '+' or '-'. */
1732 if (op
!= '-' && op
!= '+')
1733 tcc_error("cannot use pointers here");
1734 /* Put pointer as first operand */
1735 if (bt2
== VT_PTR
) {
1739 type1
= vtop
[-1].type
;
1740 type1
.t
&= ~VT_ARRAY
;
1741 if (vtop
[-1].type
.t
& VT_VLA
)
1742 vla_runtime_pointed_size(&vtop
[-1].type
);
1744 u
= pointed_size(&vtop
[-1].type
);
1746 tcc_error("unknown array element size");
1747 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1750 /* XXX: cast to int ? (long long case) */
1755 #ifdef CONFIG_TCC_BCHECK
1756 /* if evaluating constant expression, no code should be
1757 generated, so no bound check */
1758 if (tcc_state
->do_bounds_check
&& !const_wanted
) {
1759 /* if bounded pointers, we generate a special code to
1766 gen_bounded_ptr_add();
1772 /* put again type if gen_opic() swaped operands */
1775 } else if (is_float(bt1
) || is_float(bt2
)) {
1776 /* compute bigger type and do implicit casts */
1777 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
1779 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
1784 /* floats can only be used for a few operations */
1785 if (op
!= '+' && op
!= '-' && op
!= '*' && op
!= '/' &&
1786 (op
< TOK_ULT
|| op
> TOK_GT
))
1787 tcc_error("invalid operands for binary operation");
1789 } else if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
) {
1790 t
= bt1
== VT_LLONG
? VT_LLONG
: VT_INT
;
1791 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (t
| VT_UNSIGNED
))
1794 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
1795 /* cast to biggest op */
1797 /* convert to unsigned if it does not fit in a long long */
1798 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
1799 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
1802 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
1803 tcc_error("comparison of struct");
1805 /* integer operations */
1807 /* convert to unsigned if it does not fit in an integer */
1808 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
1809 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
1812 /* XXX: currently, some unsigned operations are explicit, so
1813 we modify them here */
1814 if (t
& VT_UNSIGNED
) {
1821 else if (op
== TOK_LT
)
1823 else if (op
== TOK_GT
)
1825 else if (op
== TOK_LE
)
1827 else if (op
== TOK_GE
)
1834 /* special case for shifts and long long: we keep the shift as
1836 if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
)
1843 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
1844 /* relationnal op: the result is an int */
1845 vtop
->type
.t
= VT_INT
;
1850 // Make sure that we have converted to an rvalue:
1851 if (vtop
->r
& VT_LVAL
)
1852 gv(is_float(vtop
->type
.t
& VT_BTYPE
) ? RC_FLOAT
: RC_INT
);
1855 #ifndef TCC_TARGET_ARM
1856 /* generic itof for unsigned long long case */
1857 static void gen_cvt_itof1(int t
)
1859 #ifdef TCC_TARGET_ARM64
1862 if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
1863 (VT_LLONG
| VT_UNSIGNED
)) {
1866 vpush_global_sym(&func_old_type
, TOK___floatundisf
);
1867 #if LDOUBLE_SIZE != 8
1868 else if (t
== VT_LDOUBLE
)
1869 vpush_global_sym(&func_old_type
, TOK___floatundixf
);
1872 vpush_global_sym(&func_old_type
, TOK___floatundidf
);
1876 vtop
->r
= reg_fret(t
);
1884 /* generic ftoi for unsigned long long case */
1885 static void gen_cvt_ftoi1(int t
)
1887 #ifdef TCC_TARGET_ARM64
1892 if (t
== (VT_LLONG
| VT_UNSIGNED
)) {
1893 /* not handled natively */
1894 st
= vtop
->type
.t
& VT_BTYPE
;
1896 vpush_global_sym(&func_old_type
, TOK___fixunssfdi
);
1897 #if LDOUBLE_SIZE != 8
1898 else if (st
== VT_LDOUBLE
)
1899 vpush_global_sym(&func_old_type
, TOK___fixunsxfdi
);
1902 vpush_global_sym(&func_old_type
, TOK___fixunsdfdi
);
1907 vtop
->r2
= REG_LRET
;
1914 /* force char or short cast */
1915 static void force_charshort_cast(int t
)
1919 /* XXX: add optimization if lvalue : just change type and offset */
1924 if (t
& VT_UNSIGNED
) {
1925 vpushi((1 << bits
) - 1);
1931 /* result must be signed or the SAR is converted to an SHL
1932 This was not the case when "t" was a signed short
1933 and the last value on the stack was an unsigned int */
1934 vtop
->type
.t
&= ~VT_UNSIGNED
;
1940 /* cast 'vtop' to 'type'. Casting to bitfields is forbidden. */
1941 static void gen_cast(CType
*type
)
1943 int sbt
, dbt
, sf
, df
, c
, p
;
1945 /* special delayed cast for char/short */
1946 /* XXX: in some cases (multiple cascaded casts), it may still
1948 if (vtop
->r
& VT_MUSTCAST
) {
1949 vtop
->r
&= ~VT_MUSTCAST
;
1950 force_charshort_cast(vtop
->type
.t
);
1953 /* bitfields first get cast to ints */
1954 if (vtop
->type
.t
& VT_BITFIELD
) {
1958 dbt
= type
->t
& (VT_BTYPE
| VT_UNSIGNED
);
1959 sbt
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
1964 c
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1965 p
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
);
1967 /* constant case: we can do it now */
1968 /* XXX: in ISOC, cannot do it if error in convert */
1969 if (sbt
== VT_FLOAT
)
1970 vtop
->c
.ld
= vtop
->c
.f
;
1971 else if (sbt
== VT_DOUBLE
)
1972 vtop
->c
.ld
= vtop
->c
.d
;
1975 if ((sbt
& VT_BTYPE
) == VT_LLONG
) {
1976 if (sbt
& VT_UNSIGNED
)
1977 vtop
->c
.ld
= vtop
->c
.ull
;
1979 vtop
->c
.ld
= vtop
->c
.ll
;
1981 if (sbt
& VT_UNSIGNED
)
1982 vtop
->c
.ld
= vtop
->c
.ui
;
1984 vtop
->c
.ld
= vtop
->c
.i
;
1987 if (dbt
== VT_FLOAT
)
1988 vtop
->c
.f
= (float)vtop
->c
.ld
;
1989 else if (dbt
== VT_DOUBLE
)
1990 vtop
->c
.d
= (double)vtop
->c
.ld
;
1991 } else if (sf
&& dbt
== (VT_LLONG
|VT_UNSIGNED
)) {
1992 vtop
->c
.ull
= (unsigned long long)vtop
->c
.ld
;
1993 } else if (sf
&& dbt
== VT_BOOL
) {
1994 vtop
->c
.i
= (vtop
->c
.ld
!= 0);
1997 vtop
->c
.ll
= (long long)vtop
->c
.ld
;
1998 else if (sbt
== (VT_LLONG
|VT_UNSIGNED
))
1999 vtop
->c
.ll
= vtop
->c
.ull
;
2000 else if (sbt
& VT_UNSIGNED
)
2001 vtop
->c
.ll
= vtop
->c
.ui
;
2002 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2003 else if (sbt
== VT_PTR
)
2006 else if (sbt
!= VT_LLONG
)
2007 vtop
->c
.ll
= vtop
->c
.i
;
2009 if (dbt
== (VT_LLONG
|VT_UNSIGNED
))
2010 vtop
->c
.ull
= vtop
->c
.ll
;
2011 else if (dbt
== VT_BOOL
)
2012 vtop
->c
.i
= (vtop
->c
.ll
!= 0);
2013 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2014 else if (dbt
== VT_PTR
)
2017 else if (dbt
!= VT_LLONG
) {
2019 if ((dbt
& VT_BTYPE
) == VT_BYTE
)
2021 else if ((dbt
& VT_BTYPE
) == VT_SHORT
)
2023 if(dbt
& VT_UNSIGNED
)
2024 vtop
->c
.ui
= ((unsigned int)vtop
->c
.ll
<< s
) >> s
;
2026 vtop
->c
.i
= ((int)vtop
->c
.ll
<< s
) >> s
;
2029 } else if (p
&& dbt
== VT_BOOL
) {
2032 } else if (!nocode_wanted
) {
2033 /* non constant case: generate code */
2035 /* convert from fp to fp */
2038 /* convert int to fp */
2041 /* convert fp to int */
2042 if (dbt
== VT_BOOL
) {
2046 /* we handle char/short/etc... with generic code */
2047 if (dbt
!= (VT_INT
| VT_UNSIGNED
) &&
2048 dbt
!= (VT_LLONG
| VT_UNSIGNED
) &&
2052 if (dbt
== VT_INT
&& (type
->t
& (VT_BTYPE
| VT_UNSIGNED
)) != dbt
) {
2053 /* additional cast for char/short... */
2058 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
2059 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
) {
2060 if ((sbt
& VT_BTYPE
) != VT_LLONG
) {
2061 /* scalar to long long */
2062 /* machine independent conversion */
2064 /* generate high word */
2065 if (sbt
== (VT_INT
| VT_UNSIGNED
)) {
2069 if (sbt
== VT_PTR
) {
2070 /* cast from pointer to int before we apply
2071 shift operation, which pointers don't support*/
2072 gen_cast(&int_type
);
2078 /* patch second register */
2079 vtop
[-1].r2
= vtop
->r
;
2083 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
||
2084 (dbt
& VT_BTYPE
) == VT_PTR
||
2085 (dbt
& VT_BTYPE
) == VT_FUNC
) {
2086 if ((sbt
& VT_BTYPE
) != VT_LLONG
&&
2087 (sbt
& VT_BTYPE
) != VT_PTR
&&
2088 (sbt
& VT_BTYPE
) != VT_FUNC
) {
2089 /* need to convert from 32bit to 64bit */
2091 if (sbt
!= (VT_INT
| VT_UNSIGNED
)) {
2092 #if defined(TCC_TARGET_ARM64)
2094 #elif defined(TCC_TARGET_X86_64)
2096 /* x86_64 specific: movslq */
2098 o(0xc0 + (REG_VALUE(r
) << 3) + REG_VALUE(r
));
2105 } else if (dbt
== VT_BOOL
) {
2106 /* scalar to bool */
2109 } else if ((dbt
& VT_BTYPE
) == VT_BYTE
||
2110 (dbt
& VT_BTYPE
) == VT_SHORT
) {
2111 if (sbt
== VT_PTR
) {
2112 vtop
->type
.t
= VT_INT
;
2113 tcc_warning("nonportable conversion from pointer to char/short");
2115 force_charshort_cast(dbt
);
2116 } else if ((dbt
& VT_BTYPE
) == VT_INT
) {
2118 if (sbt
== VT_LLONG
) {
2119 /* from long long: just take low order word */
2123 /* if lvalue and single word type, nothing to do because
2124 the lvalue already contains the real type size (see
2125 VT_LVAL_xxx constants) */
2128 } else if ((dbt
& VT_BTYPE
) == VT_PTR
&& !(vtop
->r
& VT_LVAL
)) {
2129 /* if we are casting between pointer types,
2130 we must update the VT_LVAL_xxx size */
2131 vtop
->r
= (vtop
->r
& ~VT_LVAL_TYPE
)
2132 | (lvalue_type(type
->ref
->type
.t
) & VT_LVAL_TYPE
);
2137 /* return type size as known at compile time. Put alignment at 'a' */
2138 ST_FUNC
int type_size(CType
*type
, int *a
)
2143 bt
= type
->t
& VT_BTYPE
;
2144 if (bt
== VT_STRUCT
) {
2149 } else if (bt
== VT_PTR
) {
2150 if (type
->t
& VT_ARRAY
) {
2154 ts
= type_size(&s
->type
, a
);
2156 if (ts
< 0 && s
->c
< 0)
2164 } else if (bt
== VT_LDOUBLE
) {
2166 return LDOUBLE_SIZE
;
2167 } else if (bt
== VT_DOUBLE
|| bt
== VT_LLONG
) {
2168 #ifdef TCC_TARGET_I386
2169 #ifdef TCC_TARGET_PE
2174 #elif defined(TCC_TARGET_ARM)
2184 } else if (bt
== VT_INT
|| bt
== VT_ENUM
|| bt
== VT_FLOAT
) {
2187 } else if (bt
== VT_SHORT
) {
2190 } else if (bt
== VT_QLONG
|| bt
== VT_QFLOAT
) {
2194 /* char, void, function, _Bool */
2200 /* push type size as known at runtime time on top of value stack. Put
2202 ST_FUNC
void vla_runtime_type_size(CType
*type
, int *a
)
2204 if (type
->t
& VT_VLA
) {
2205 vset(&int_type
, VT_LOCAL
|VT_LVAL
, type
->ref
->c
);
2207 vpushi(type_size(type
, a
));
2211 static void vla_sp_save(void) {
2212 if (!(vla_flags
& VLA_SP_LOC_SET
)) {
2213 *vla_sp_loc
= (loc
-= PTR_SIZE
);
2214 vla_flags
|= VLA_SP_LOC_SET
;
2216 if (!(vla_flags
& VLA_SP_SAVED
)) {
2217 gen_vla_sp_save(*vla_sp_loc
);
2218 vla_flags
|= VLA_SP_SAVED
;
2222 /* return the pointed type of t */
2223 static inline CType
*pointed_type(CType
*type
)
2225 return &type
->ref
->type
;
2228 /* modify type so that its it is a pointer to type. */
2229 ST_FUNC
void mk_pointer(CType
*type
)
2232 s
= sym_push(SYM_FIELD
, type
, 0, -1);
2233 type
->t
= VT_PTR
| (type
->t
& ~VT_TYPE
);
2237 /* compare function types. OLD functions match any new functions */
2238 static int is_compatible_func(CType
*type1
, CType
*type2
)
2244 if (!is_compatible_types(&s1
->type
, &s2
->type
))
2246 /* check func_call */
2247 if (s1
->a
.func_call
!= s2
->a
.func_call
)
2249 /* XXX: not complete */
2250 if (s1
->c
== FUNC_OLD
|| s2
->c
== FUNC_OLD
)
2254 while (s1
!= NULL
) {
2257 if (!is_compatible_parameter_types(&s1
->type
, &s2
->type
))
2267 /* return true if type1 and type2 are the same. If unqualified is
2268 true, qualifiers on the types are ignored.
2270 - enums are not checked as gcc __builtin_types_compatible_p ()
2272 static int compare_types(CType
*type1
, CType
*type2
, int unqualified
)
2276 t1
= type1
->t
& VT_TYPE
;
2277 t2
= type2
->t
& VT_TYPE
;
2279 /* strip qualifiers before comparing */
2280 t1
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2281 t2
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2283 /* Default Vs explicit signedness only matters for char */
2284 if ((t1
& VT_BTYPE
) != VT_BYTE
) {
2288 /* XXX: bitfields ? */
2291 /* test more complicated cases */
2292 bt1
= t1
& VT_BTYPE
;
2293 if (bt1
== VT_PTR
) {
2294 type1
= pointed_type(type1
);
2295 type2
= pointed_type(type2
);
2296 return is_compatible_types(type1
, type2
);
2297 } else if (bt1
== VT_STRUCT
) {
2298 return (type1
->ref
== type2
->ref
);
2299 } else if (bt1
== VT_FUNC
) {
2300 return is_compatible_func(type1
, type2
);
2306 /* return true if type1 and type2 are exactly the same (including
2309 static int is_compatible_types(CType
*type1
, CType
*type2
)
2311 return compare_types(type1
,type2
,0);
2314 /* return true if type1 and type2 are the same (ignoring qualifiers).
2316 static int is_compatible_parameter_types(CType
*type1
, CType
*type2
)
2318 return compare_types(type1
,type2
,1);
2321 /* print a type. If 'varstr' is not NULL, then the variable is also
2322 printed in the type */
2324 /* XXX: add array and function pointers */
2325 static void type_to_str(char *buf
, int buf_size
,
2326 CType
*type
, const char *varstr
)
2333 t
= type
->t
& VT_TYPE
;
2336 if (t
& VT_CONSTANT
)
2337 pstrcat(buf
, buf_size
, "const ");
2338 if (t
& VT_VOLATILE
)
2339 pstrcat(buf
, buf_size
, "volatile ");
2340 if ((t
& (VT_DEFSIGN
| VT_UNSIGNED
)) == (VT_DEFSIGN
| VT_UNSIGNED
))
2341 pstrcat(buf
, buf_size
, "unsigned ");
2342 else if (t
& VT_DEFSIGN
)
2343 pstrcat(buf
, buf_size
, "signed ");
2373 tstr
= "long double";
2375 pstrcat(buf
, buf_size
, tstr
);
2379 if (bt
== VT_STRUCT
)
2383 pstrcat(buf
, buf_size
, tstr
);
2384 v
= type
->ref
->v
& ~SYM_STRUCT
;
2385 if (v
>= SYM_FIRST_ANOM
)
2386 pstrcat(buf
, buf_size
, "<anonymous>");
2388 pstrcat(buf
, buf_size
, get_tok_str(v
, NULL
));
2392 type_to_str(buf
, buf_size
, &s
->type
, varstr
);
2393 pstrcat(buf
, buf_size
, "(");
2395 while (sa
!= NULL
) {
2396 type_to_str(buf1
, sizeof(buf1
), &sa
->type
, NULL
);
2397 pstrcat(buf
, buf_size
, buf1
);
2400 pstrcat(buf
, buf_size
, ", ");
2402 pstrcat(buf
, buf_size
, ")");
2406 pstrcpy(buf1
, sizeof(buf1
), "*");
2408 pstrcat(buf1
, sizeof(buf1
), varstr
);
2409 type_to_str(buf
, buf_size
, &s
->type
, buf1
);
2413 pstrcat(buf
, buf_size
, " ");
2414 pstrcat(buf
, buf_size
, varstr
);
2419 /* verify type compatibility to store vtop in 'dt' type, and generate
2421 static void gen_assign_cast(CType
*dt
)
2423 CType
*st
, *type1
, *type2
, tmp_type1
, tmp_type2
;
2424 char buf1
[256], buf2
[256];
2427 st
= &vtop
->type
; /* source type */
2428 dbt
= dt
->t
& VT_BTYPE
;
2429 sbt
= st
->t
& VT_BTYPE
;
2430 if (sbt
== VT_VOID
|| dbt
== VT_VOID
) {
2431 if (sbt
== VT_VOID
&& dbt
== VT_VOID
)
2433 It is Ok if both are void
2439 gcc accepts this program
2442 tcc_error("cannot cast from/to void");
2444 if (dt
->t
& VT_CONSTANT
)
2445 tcc_warning("assignment of read-only location");
2448 /* special cases for pointers */
2449 /* '0' can also be a pointer */
2450 if (is_null_pointer(vtop
))
2452 /* accept implicit pointer to integer cast with warning */
2453 if (is_integer_btype(sbt
)) {
2454 tcc_warning("assignment makes pointer from integer without a cast");
2457 type1
= pointed_type(dt
);
2458 /* a function is implicitely a function pointer */
2459 if (sbt
== VT_FUNC
) {
2460 if ((type1
->t
& VT_BTYPE
) != VT_VOID
&&
2461 !is_compatible_types(pointed_type(dt
), st
))
2462 tcc_warning("assignment from incompatible pointer type");
2467 type2
= pointed_type(st
);
2468 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
2469 (type2
->t
& VT_BTYPE
) == VT_VOID
) {
2470 /* void * can match anything */
2472 /* exact type match, except for unsigned */
2475 tmp_type1
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
|
2477 tmp_type2
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
|
2479 if (!is_compatible_types(&tmp_type1
, &tmp_type2
))
2480 tcc_warning("assignment from incompatible pointer type");
2482 /* check const and volatile */
2483 if ((!(type1
->t
& VT_CONSTANT
) && (type2
->t
& VT_CONSTANT
)) ||
2484 (!(type1
->t
& VT_VOLATILE
) && (type2
->t
& VT_VOLATILE
)))
2485 tcc_warning("assignment discards qualifiers from pointer target type");
2491 if (sbt
== VT_PTR
|| sbt
== VT_FUNC
) {
2492 tcc_warning("assignment makes integer from pointer without a cast");
2494 /* XXX: more tests */
2499 tmp_type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2500 tmp_type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2501 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
2503 type_to_str(buf1
, sizeof(buf1
), st
, NULL
);
2504 type_to_str(buf2
, sizeof(buf2
), dt
, NULL
);
2505 tcc_error("cannot cast '%s' to '%s'", buf1
, buf2
);
2513 /* store vtop in lvalue pushed on stack */
2514 ST_FUNC
void vstore(void)
2516 int sbt
, dbt
, ft
, r
, t
, size
, align
, bit_size
, bit_pos
, rc
, delayed_cast
;
2518 ft
= vtop
[-1].type
.t
;
2519 sbt
= vtop
->type
.t
& VT_BTYPE
;
2520 dbt
= ft
& VT_BTYPE
;
2521 if ((((sbt
== VT_INT
|| sbt
== VT_SHORT
) && dbt
== VT_BYTE
) ||
2522 (sbt
== VT_INT
&& dbt
== VT_SHORT
))
2523 && !(vtop
->type
.t
& VT_BITFIELD
)) {
2524 /* optimize char/short casts */
2525 delayed_cast
= VT_MUSTCAST
;
2526 vtop
->type
.t
= ft
& (VT_TYPE
& ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
)));
2527 /* XXX: factorize */
2528 if (ft
& VT_CONSTANT
)
2529 tcc_warning("assignment of read-only location");
2532 if (!(ft
& VT_BITFIELD
))
2533 gen_assign_cast(&vtop
[-1].type
);
2536 if (sbt
== VT_STRUCT
) {
2537 /* if structure, only generate pointer */
2538 /* structure assignment : generate memcpy */
2539 /* XXX: optimize if small size */
2540 if (!nocode_wanted
) {
2541 size
= type_size(&vtop
->type
, &align
);
2545 vtop
->type
.t
= VT_PTR
;
2548 /* address of memcpy() */
2551 vpush_global_sym(&func_old_type
, TOK_memcpy8
);
2552 else if(!(align
& 3))
2553 vpush_global_sym(&func_old_type
, TOK_memcpy4
);
2556 vpush_global_sym(&func_old_type
, TOK_memcpy
);
2561 vtop
->type
.t
= VT_PTR
;
2570 /* leave source on stack */
2571 } else if (ft
& VT_BITFIELD
) {
2572 /* bitfield store handling */
2574 /* save lvalue as expression result (example: s.b = s.a = n;) */
2575 vdup(), vtop
[-1] = vtop
[-2];
2577 bit_pos
= (ft
>> VT_STRUCT_SHIFT
) & 0x3f;
2578 bit_size
= (ft
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
2579 /* remove bit field info to avoid loops */
2580 vtop
[-1].type
.t
= ft
& ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
));
2582 if((ft
& VT_BTYPE
) == VT_BOOL
) {
2583 gen_cast(&vtop
[-1].type
);
2584 vtop
[-1].type
.t
= (vtop
[-1].type
.t
& ~VT_BTYPE
) | (VT_BYTE
| VT_UNSIGNED
);
2587 /* duplicate destination */
2589 vtop
[-1] = vtop
[-2];
2591 /* mask and shift source */
2592 if((ft
& VT_BTYPE
) != VT_BOOL
) {
2593 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2594 vpushll((1ULL << bit_size
) - 1ULL);
2596 vpushi((1 << bit_size
) - 1);
2602 /* load destination, mask and or with source */
2604 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2605 vpushll(~(((1ULL << bit_size
) - 1ULL) << bit_pos
));
2607 vpushi(~(((1 << bit_size
) - 1) << bit_pos
));
2613 /* ... and discard */
2617 #ifdef CONFIG_TCC_BCHECK
2618 /* bound check case */
2619 if (vtop
[-1].r
& VT_MUSTBOUND
) {
2625 if (!nocode_wanted
) {
2629 #ifdef TCC_TARGET_X86_64
2630 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
2632 } else if ((ft
& VT_BTYPE
) == VT_QFLOAT
) {
2637 r
= gv(rc
); /* generate value */
2638 /* if lvalue was saved on stack, must read it */
2639 if ((vtop
[-1].r
& VT_VALMASK
) == VT_LLOCAL
) {
2641 t
= get_reg(RC_INT
);
2642 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2647 sv
.r
= VT_LOCAL
| VT_LVAL
;
2648 sv
.c
.ul
= vtop
[-1].c
.ul
;
2650 vtop
[-1].r
= t
| VT_LVAL
;
2652 /* two word case handling : store second register at word + 4 (or +8 for x86-64) */
2653 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2654 if (((ft
& VT_BTYPE
) == VT_QLONG
) || ((ft
& VT_BTYPE
) == VT_QFLOAT
)) {
2655 int addr_type
= VT_LLONG
, load_size
= 8, load_type
= ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) ? VT_LLONG
: VT_DOUBLE
;
2657 if ((ft
& VT_BTYPE
) == VT_LLONG
) {
2658 int addr_type
= VT_INT
, load_size
= 4, load_type
= VT_INT
;
2660 vtop
[-1].type
.t
= load_type
;
2663 /* convert to int to increment easily */
2664 vtop
->type
.t
= addr_type
;
2670 vtop
[-1].type
.t
= load_type
;
2671 /* XXX: it works because r2 is spilled last ! */
2672 store(vtop
->r2
, vtop
- 1);
2678 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
2679 vtop
->r
|= delayed_cast
;
2683 /* post defines POST/PRE add. c is the token ++ or -- */
2684 ST_FUNC
void inc(int post
, int c
)
2687 vdup(); /* save lvalue */
2689 gv_dup(); /* duplicate value */
2694 vpushi(c
- TOK_MID
);
2696 vstore(); /* store value */
2698 vpop(); /* if post op, return saved value */
2701 /* Parse GNUC __attribute__ extension. Currently, the following
2702 extensions are recognized:
2703 - aligned(n) : set data/function alignment.
2704 - packed : force data alignment to 1
2705 - section(x) : generate data/code in this section.
2706 - unused : currently ignored, but may be used someday.
2707 - regparm(n) : pass function parameters in registers (i386 only)
2709 static void parse_attribute(AttributeDef
*ad
)
2713 while (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
) {
2717 while (tok
!= ')') {
2718 if (tok
< TOK_IDENT
)
2719 expect("attribute name");
2727 expect("section name");
2728 ad
->section
= find_section(tcc_state
, (char *)tokc
.cstr
->data
);
2736 expect("alias(\"target\")");
2737 ad
->alias_target
= /* save string as token, for later */
2738 tok_alloc((char*)tokc
.cstr
->data
, tokc
.cstr
->size
-1)->tok
;
2742 case TOK_VISIBILITY1
:
2743 case TOK_VISIBILITY2
:
2746 expect("visibility(\"default|hidden|internal|protected\")");
2747 if (!strcmp (tokc
.cstr
->data
, "default"))
2748 ad
->a
.visibility
= STV_DEFAULT
;
2749 else if (!strcmp (tokc
.cstr
->data
, "hidden"))
2750 ad
->a
.visibility
= STV_HIDDEN
;
2751 else if (!strcmp (tokc
.cstr
->data
, "internal"))
2752 ad
->a
.visibility
= STV_INTERNAL
;
2753 else if (!strcmp (tokc
.cstr
->data
, "protected"))
2754 ad
->a
.visibility
= STV_PROTECTED
;
2756 expect("visibility(\"default|hidden|internal|protected\")");
2765 if (n
<= 0 || (n
& (n
- 1)) != 0)
2766 tcc_error("alignment must be a positive power of two");
2783 /* currently, no need to handle it because tcc does not
2784 track unused objects */
2788 /* currently, no need to handle it because tcc does not
2789 track unused objects */
2794 ad
->a
.func_call
= FUNC_CDECL
;
2799 ad
->a
.func_call
= FUNC_STDCALL
;
2801 #ifdef TCC_TARGET_I386
2811 ad
->a
.func_call
= FUNC_FASTCALL1
+ n
- 1;
2817 ad
->a
.func_call
= FUNC_FASTCALLW
;
2824 ad
->a
.mode
= VT_LLONG
+ 1;
2827 ad
->a
.mode
= VT_SHORT
+ 1;
2830 ad
->a
.mode
= VT_INT
+ 1;
2833 tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok
, NULL
));
2840 ad
->a
.func_export
= 1;
2843 ad
->a
.func_import
= 1;
2846 if (tcc_state
->warn_unsupported
)
2847 tcc_warning("'%s' attribute ignored", get_tok_str(t
, NULL
));
2848 /* skip parameters */
2850 int parenthesis
= 0;
2854 else if (tok
== ')')
2857 } while (parenthesis
&& tok
!= -1);
2870 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
2871 static void struct_decl(CType
*type
, int u
, int tdef
)
2873 int a
, v
, size
, align
, maxalign
, c
, offset
, flexible
;
2874 int bit_size
, bit_pos
, bsize
, bt
, lbit_pos
, prevbt
;
2875 Sym
*s
, *ss
, *ass
, **ps
;
2879 a
= tok
; /* save decl type */
2884 /* struct already defined ? return it */
2886 expect("struct/union/enum name");
2890 tcc_error("invalid type");
2892 } else if (tok
>= TOK_IDENT
&& !tdef
)
2893 tcc_error("unknown struct/union/enum");
2899 /* we put an undefined size for struct/union */
2900 s
= sym_push(v
| SYM_STRUCT
, &type1
, 0, -1);
2901 s
->r
= 0; /* default alignment is zero as gcc */
2902 /* put struct/union/enum name in type */
2910 tcc_error("struct/union/enum already defined");
2911 /* cannot be empty */
2913 /* non empty enums are not allowed */
2914 if (a
== TOK_ENUM
) {
2918 expect("identifier");
2920 if (ss
&& !local_stack
)
2921 tcc_error("redefinition of enumerator '%s'",
2922 get_tok_str(v
, NULL
));
2928 /* enum symbols have static storage */
2929 ss
= sym_push(v
, &int_type
, VT_CONST
, c
);
2930 ss
->type
.t
|= VT_STATIC
;
2935 /* NOTE: we accept a trailing comma */
2939 s
->c
= type_size(&int_type
, &align
);
2948 while (tok
!= '}') {
2949 parse_btype(&btype
, &ad
);
2952 tcc_error("flexible array member '%s' not at the end of struct",
2953 get_tok_str(v
, NULL
));
2958 type_decl(&type1
, &ad
, &v
, TYPE_DIRECT
| TYPE_ABSTRACT
);
2959 if (v
== 0 && (type1
.t
& VT_BTYPE
) != VT_STRUCT
)
2960 expect("identifier");
2961 if (type_size(&type1
, &align
) < 0) {
2962 if ((a
== TOK_STRUCT
) && (type1
.t
& VT_ARRAY
) && c
)
2965 tcc_error("field '%s' has incomplete type",
2966 get_tok_str(v
, NULL
));
2968 if ((type1
.t
& VT_BTYPE
) == VT_FUNC
||
2969 (type1
.t
& (VT_TYPEDEF
| VT_STATIC
| VT_EXTERN
| VT_INLINE
)))
2970 tcc_error("invalid type for '%s'",
2971 get_tok_str(v
, NULL
));
2975 bit_size
= expr_const();
2976 /* XXX: handle v = 0 case for messages */
2978 tcc_error("negative width in bit-field '%s'",
2979 get_tok_str(v
, NULL
));
2980 if (v
&& bit_size
== 0)
2981 tcc_error("zero width for bit-field '%s'",
2982 get_tok_str(v
, NULL
));
2984 size
= type_size(&type1
, &align
);
2986 if (align
< ad
.a
.aligned
)
2987 align
= ad
.a
.aligned
;
2988 } else if (ad
.a
.packed
) {
2990 } else if (*tcc_state
->pack_stack_ptr
) {
2991 if (align
> *tcc_state
->pack_stack_ptr
)
2992 align
= *tcc_state
->pack_stack_ptr
;
2995 if (bit_size
>= 0) {
2996 bt
= type1
.t
& VT_BTYPE
;
3003 tcc_error("bitfields must have scalar type");
3005 if (bit_size
> bsize
) {
3006 tcc_error("width of '%s' exceeds its type",
3007 get_tok_str(v
, NULL
));
3008 } else if (bit_size
== bsize
) {
3009 /* no need for bit fields */
3011 } else if (bit_size
== 0) {
3012 /* XXX: what to do if only padding in a
3014 /* zero size: means to pad */
3017 /* we do not have enough room ?
3018 did the type change?
3020 if ((bit_pos
+ bit_size
) > bsize
||
3021 bt
!= prevbt
|| a
== TOK_UNION
)
3024 /* XXX: handle LSB first */
3025 type1
.t
|= VT_BITFIELD
|
3026 (bit_pos
<< VT_STRUCT_SHIFT
) |
3027 (bit_size
<< (VT_STRUCT_SHIFT
+ 6));
3028 bit_pos
+= bit_size
;
3034 if (v
!= 0 || (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
3035 /* add new memory data only if starting
3037 if (lbit_pos
== 0) {
3038 if (a
== TOK_STRUCT
) {
3039 c
= (c
+ align
- 1) & -align
;
3048 if (align
> maxalign
)
3052 printf("add field %s offset=%d",
3053 get_tok_str(v
, NULL
), offset
);
3054 if (type1
.t
& VT_BITFIELD
) {
3055 printf(" pos=%d size=%d",
3056 (type1
.t
>> VT_STRUCT_SHIFT
) & 0x3f,
3057 (type1
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f);
3062 if (v
== 0 && (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
3064 while ((ass
= ass
->next
) != NULL
) {
3065 ss
= sym_push(ass
->v
, &ass
->type
, 0, offset
+ ass
->c
);
3070 ss
= sym_push(v
| SYM_FIELD
, &type1
, 0, offset
);
3074 if (tok
== ';' || tok
== TOK_EOF
)
3081 /* store size and alignment */
3082 s
->c
= (c
+ maxalign
- 1) & -maxalign
;
3088 /* return 1 if basic type is a type size (short, long, long long) */
3089 ST_FUNC
int is_btype_size(int bt
)
3091 return bt
== VT_SHORT
|| bt
== VT_LONG
|| bt
== VT_LLONG
;
3094 /* return 0 if no type declaration. otherwise, return the basic type
3097 static int parse_btype(CType
*type
, AttributeDef
*ad
)
3099 int t
, u
, bt_size
, complete
, type_found
, typespec_found
;
3103 memset(ad
, 0, sizeof(AttributeDef
));
3111 /* currently, we really ignore extension */
3122 tcc_error("too many basic types");
3124 bt_size
= is_btype_size (u
& VT_BTYPE
);
3125 if (u
== VT_INT
|| (!bt_size
&& !(t
& VT_TYPEDEF
)))
3140 if ((t
& VT_BTYPE
) == VT_DOUBLE
) {
3141 #ifndef TCC_TARGET_PE
3142 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3144 } else if ((t
& VT_BTYPE
) == VT_LONG
) {
3145 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3151 #ifdef TCC_TARGET_ARM64
3153 /* GCC's __uint128_t appears in some Linux header files. Make it a
3154 synonym for long double to get the size and alignment right. */
3166 if ((t
& VT_BTYPE
) == VT_LONG
) {
3167 #ifdef TCC_TARGET_PE
3168 t
= (t
& ~VT_BTYPE
) | VT_DOUBLE
;
3170 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3178 struct_decl(&type1
, VT_ENUM
, t
& (VT_TYPEDEF
| VT_EXTERN
));
3181 type
->ref
= type1
.ref
;
3185 struct_decl(&type1
, VT_STRUCT
, t
& (VT_TYPEDEF
| VT_EXTERN
));
3188 /* type modifiers */
3204 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == (VT_DEFSIGN
|VT_UNSIGNED
))
3205 tcc_error("signed and unsigned modifier");
3218 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == VT_DEFSIGN
)
3219 tcc_error("signed and unsigned modifier");
3220 t
|= VT_DEFSIGN
| VT_UNSIGNED
;
3245 /* GNUC attribute */
3246 case TOK_ATTRIBUTE1
:
3247 case TOK_ATTRIBUTE2
:
3248 parse_attribute(ad
);
3251 t
= (t
& ~VT_BTYPE
) | u
;
3259 parse_expr_type(&type1
);
3260 /* remove all storage modifiers except typedef */
3261 type1
.t
&= ~(VT_STORAGE
&~VT_TYPEDEF
);
3267 if (!s
|| !(s
->type
.t
& VT_TYPEDEF
))
3269 t
|= (s
->type
.t
& ~VT_TYPEDEF
);
3270 type
->ref
= s
->type
.ref
;
3272 /* get attributes from typedef */
3273 if (0 == ad
->a
.aligned
)
3274 ad
->a
.aligned
= s
->a
.aligned
;
3275 if (0 == ad
->a
.func_call
)
3276 ad
->a
.func_call
= s
->a
.func_call
;
3277 ad
->a
.packed
|= s
->a
.packed
;
3286 if (tcc_state
->char_is_unsigned
) {
3287 if ((t
& (VT_DEFSIGN
|VT_BTYPE
)) == VT_BYTE
)
3291 /* long is never used as type */
3292 if ((t
& VT_BTYPE
) == VT_LONG
)
3293 #if (!defined TCC_TARGET_X86_64 && !defined TCC_TARGET_ARM64) || \
3294 defined TCC_TARGET_PE
3295 t
= (t
& ~VT_BTYPE
) | VT_INT
;
3297 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3303 /* convert a function parameter type (array to pointer and function to
3304 function pointer) */
3305 static inline void convert_parameter_type(CType
*pt
)
3307 /* remove const and volatile qualifiers (XXX: const could be used
3308 to indicate a const function parameter */
3309 pt
->t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3310 /* array must be transformed to pointer according to ANSI C */
3312 if ((pt
->t
& VT_BTYPE
) == VT_FUNC
) {
3317 ST_FUNC
void parse_asm_str(CString
*astr
)
3320 /* read the string */
3322 expect("string constant");
3324 while (tok
== TOK_STR
) {
3325 /* XXX: add \0 handling too ? */
3326 cstr_cat(astr
, tokc
.cstr
->data
);
3329 cstr_ccat(astr
, '\0');
3332 /* Parse an asm label and return the label
3333 * Don't forget to free the CString in the caller! */
3334 static void asm_label_instr(CString
*astr
)
3337 parse_asm_str(astr
);
3340 printf("asm_alias: \"%s\"\n", (char *)astr
->data
);
3344 static void post_type(CType
*type
, AttributeDef
*ad
)
3346 int n
, l
, t1
, arg_size
, align
;
3347 Sym
**plast
, *s
, *first
;
3352 /* function declaration */
3360 /* read param name and compute offset */
3361 if (l
!= FUNC_OLD
) {
3362 if (!parse_btype(&pt
, &ad1
)) {
3364 tcc_error("invalid type");
3371 if ((pt
.t
& VT_BTYPE
) == VT_VOID
&& tok
== ')')
3373 type_decl(&pt
, &ad1
, &n
, TYPE_DIRECT
| TYPE_ABSTRACT
);
3374 if ((pt
.t
& VT_BTYPE
) == VT_VOID
)
3375 tcc_error("parameter declared as void");
3376 arg_size
+= (type_size(&pt
, &align
) + PTR_SIZE
- 1) / PTR_SIZE
;
3381 expect("identifier");
3385 convert_parameter_type(&pt
);
3386 s
= sym_push(n
| SYM_FIELD
, &pt
, 0, 0);
3392 if (l
== FUNC_NEW
&& tok
== TOK_DOTS
) {
3399 /* if no parameters, then old type prototype */
3403 /* NOTE: const is ignored in returned type as it has a special
3404 meaning in gcc / C++ */
3405 type
->t
&= ~VT_CONSTANT
;
3406 /* some ancient pre-K&R C allows a function to return an array
3407 and the array brackets to be put after the arguments, such
3408 that "int c()[]" means something like "int[] c()" */
3411 skip(']'); /* only handle simple "[]" */
3414 /* we push a anonymous symbol which will contain the function prototype */
3415 ad
->a
.func_args
= arg_size
;
3416 s
= sym_push(SYM_FIELD
, type
, 0, l
);
3421 } else if (tok
== '[') {
3422 /* array definition */
3424 if (tok
== TOK_RESTRICT1
)
3429 if (!local_stack
|| nocode_wanted
)
3430 vpushi(expr_const());
3432 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3435 tcc_error("invalid array size");
3437 if (!is_integer_btype(vtop
->type
.t
& VT_BTYPE
))
3438 tcc_error("size of variable length array should be an integer");
3443 /* parse next post type */
3444 post_type(type
, ad
);
3445 if (type
->t
== VT_FUNC
)
3446 tcc_error("declaration of an array of functions");
3447 t1
|= type
->t
& VT_VLA
;
3450 loc
-= type_size(&int_type
, &align
);
3454 vla_runtime_type_size(type
, &align
);
3456 vset(&int_type
, VT_LOCAL
|VT_LVAL
, loc
);
3463 /* we push an anonymous symbol which will contain the array
3465 s
= sym_push(SYM_FIELD
, type
, 0, n
);
3466 type
->t
= (t1
? VT_VLA
: VT_ARRAY
) | VT_PTR
;
3471 /* Parse a type declaration (except basic type), and return the type
3472 in 'type'. 'td' is a bitmask indicating which kind of type decl is
3473 expected. 'type' should contain the basic type. 'ad' is the
3474 attribute definition of the basic type. It can be modified by
3477 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
)
3480 CType type1
, *type2
;
3481 int qualifiers
, storage
;
3483 while (tok
== '*') {
3491 qualifiers
|= VT_CONSTANT
;
3496 qualifiers
|= VT_VOLATILE
;
3504 type
->t
|= qualifiers
;
3507 /* XXX: clarify attribute handling */
3508 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3509 parse_attribute(ad
);
3511 /* recursive type */
3512 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
3513 type1
.t
= 0; /* XXX: same as int */
3516 /* XXX: this is not correct to modify 'ad' at this point, but
3517 the syntax is not clear */
3518 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3519 parse_attribute(ad
);
3520 type_decl(&type1
, ad
, v
, td
);
3523 /* type identifier */
3524 if (tok
>= TOK_IDENT
&& (td
& TYPE_DIRECT
)) {
3528 if (!(td
& TYPE_ABSTRACT
))
3529 expect("identifier");
3533 storage
= type
->t
& VT_STORAGE
;
3534 type
->t
&= ~VT_STORAGE
;
3535 if (storage
& VT_STATIC
) {
3536 int saved_nocode_wanted
= nocode_wanted
;
3538 post_type(type
, ad
);
3539 nocode_wanted
= saved_nocode_wanted
;
3541 post_type(type
, ad
);
3543 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3544 parse_attribute(ad
);
3548 /* append type at the end of type1 */
3561 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
3562 ST_FUNC
int lvalue_type(int t
)
3567 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
3569 else if (bt
== VT_SHORT
)
3573 if (t
& VT_UNSIGNED
)
3574 r
|= VT_LVAL_UNSIGNED
;
3578 /* indirection with full error checking and bound check */
3579 ST_FUNC
void indir(void)
3581 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
) {
3582 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FUNC
)
3586 if ((vtop
->r
& VT_LVAL
) && !nocode_wanted
)
3588 vtop
->type
= *pointed_type(&vtop
->type
);
3589 /* Arrays and functions are never lvalues */
3590 if (!(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_VLA
)
3591 && (vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
3592 vtop
->r
|= lvalue_type(vtop
->type
.t
);
3593 /* if bound checking, the referenced pointer must be checked */
3594 #ifdef CONFIG_TCC_BCHECK
3595 if (tcc_state
->do_bounds_check
)
3596 vtop
->r
|= VT_MUSTBOUND
;
3601 /* pass a parameter to a function and do type checking and casting */
3602 static void gfunc_param_typed(Sym
*func
, Sym
*arg
)
3607 func_type
= func
->c
;
3608 if (func_type
== FUNC_OLD
||
3609 (func_type
== FUNC_ELLIPSIS
&& arg
== NULL
)) {
3610 /* default casting : only need to convert float to double */
3611 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
) {
3614 } else if (vtop
->type
.t
& VT_BITFIELD
) {
3615 type
.t
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
3618 } else if (arg
== NULL
) {
3619 tcc_error("too many arguments to function");
3622 type
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
3623 gen_assign_cast(&type
);
3627 /* parse an expression of the form '(type)' or '(expr)' and return its
3629 static void parse_expr_type(CType
*type
)
3635 if (parse_btype(type
, &ad
)) {
3636 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3643 static void parse_type(CType
*type
)
3648 if (!parse_btype(type
, &ad
)) {
3651 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3654 static void vpush_tokc(int t
)
3659 vsetc(&type
, VT_CONST
, &tokc
);
3662 ST_FUNC
void unary(void)
3664 int n
, t
, align
, size
, r
, sizeof_caller
;
3668 static int in_sizeof
= 0;
3670 sizeof_caller
= in_sizeof
;
3672 /* XXX: GCC 2.95.3 does not generate a table although it should be
3686 vpush_tokc(VT_INT
| VT_UNSIGNED
);
3690 vpush_tokc(VT_LLONG
);
3694 vpush_tokc(VT_LLONG
| VT_UNSIGNED
);
3698 vpush_tokc(VT_FLOAT
);
3702 vpush_tokc(VT_DOUBLE
);
3706 vpush_tokc(VT_LDOUBLE
);
3709 case TOK___FUNCTION__
:
3711 goto tok_identifier
;
3717 /* special function name identifier */
3718 len
= strlen(funcname
) + 1;
3719 /* generate char[len] type */
3724 vpush_ref(&type
, data_section
, data_section
->data_offset
, len
);
3725 ptr
= section_ptr_add(data_section
, len
);
3726 memcpy(ptr
, funcname
, len
);
3731 #ifdef TCC_TARGET_PE
3732 t
= VT_SHORT
| VT_UNSIGNED
;
3738 /* string parsing */
3741 if (tcc_state
->warn_write_strings
)
3746 memset(&ad
, 0, sizeof(AttributeDef
));
3747 decl_initializer_alloc(&type
, &ad
, VT_CONST
, 2, 0, NULL
, 0);
3752 if (parse_btype(&type
, &ad
)) {
3753 type_decl(&type
, &ad
, &n
, TYPE_ABSTRACT
);
3755 /* check ISOC99 compound literal */
3757 /* data is allocated locally by default */
3762 /* all except arrays are lvalues */
3763 if (!(type
.t
& VT_ARRAY
))
3764 r
|= lvalue_type(type
.t
);
3765 memset(&ad
, 0, sizeof(AttributeDef
));
3766 decl_initializer_alloc(&type
, &ad
, r
, 1, 0, NULL
, 0);
3768 if (sizeof_caller
) {
3775 } else if (tok
== '{') {
3776 /* save all registers */
3778 /* statement expression : we do not accept break/continue
3779 inside as GCC does */
3780 block(NULL
, NULL
, NULL
, NULL
, 0, 1);
3795 /* functions names must be treated as function pointers,
3796 except for unary '&' and sizeof. Since we consider that
3797 functions are not lvalues, we only have to handle it
3798 there and in function calls. */
3799 /* arrays can also be used although they are not lvalues */
3800 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
&&
3801 !(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_LLOCAL
))
3803 mk_pointer(&vtop
->type
);
3809 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3811 boolean
.t
= VT_BOOL
;
3813 vtop
->c
.i
= !vtop
->c
.i
;
3814 } else if ((vtop
->r
& VT_VALMASK
) == VT_CMP
)
3815 vtop
->c
.i
= vtop
->c
.i
^ 1;
3818 vseti(VT_JMP
, gvtst(1, 0));
3830 if ((vtop
->type
.t
& VT_BTYPE
) == VT_PTR
)
3831 tcc_error("pointer not accepted for unary plus");
3832 /* In order to force cast, we add zero, except for floating point
3833 where we really need an noop (otherwise -0.0 will be transformed
3835 if (!is_float(vtop
->type
.t
)) {
3846 unary_type(&type
); // Perform a in_sizeof = 0;
3847 size
= type_size(&type
, &align
);
3848 if (t
== TOK_SIZEOF
) {
3849 if (!(type
.t
& VT_VLA
)) {
3851 tcc_error("sizeof applied to an incomplete type");
3854 vla_runtime_type_size(&type
, &align
);
3859 vtop
->type
.t
|= VT_UNSIGNED
;
3862 case TOK_builtin_types_compatible_p
:
3871 type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3872 type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3873 vpushi(is_compatible_types(&type1
, &type2
));
3876 case TOK_builtin_constant_p
:
3878 int saved_nocode_wanted
, res
;
3881 saved_nocode_wanted
= nocode_wanted
;
3884 res
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
3886 nocode_wanted
= saved_nocode_wanted
;
3891 case TOK_builtin_frame_address
:
3892 case TOK_builtin_return_address
:
3899 if (tok
!= TOK_CINT
|| tokc
.i
< 0) {
3900 tcc_error("%s only takes positive integers",
3901 tok1
== TOK_builtin_return_address
?
3902 "__builtin_return_address" :
3903 "__builtin_frame_address");
3910 vset(&type
, VT_LOCAL
, 0); /* local frame */
3912 mk_pointer(&vtop
->type
);
3913 indir(); /* -> parent frame */
3915 if (tok1
== TOK_builtin_return_address
) {
3916 // assume return address is just above frame pointer on stack
3919 mk_pointer(&vtop
->type
);
3924 #ifdef TCC_TARGET_X86_64
3925 #ifdef TCC_TARGET_PE
3926 case TOK_builtin_va_start
:
3934 if ((vtop
->r
& VT_VALMASK
) != VT_LOCAL
)
3935 tcc_error("__builtin_va_start expects a local variable");
3936 vtop
->r
&= ~(VT_LVAL
| VT_REF
);
3937 vtop
->type
= char_pointer_type
;
3942 case TOK_builtin_va_arg_types
:
3949 vpushi(classify_x86_64_va_arg(&type
));
3955 #ifdef TCC_TARGET_ARM64
3956 case TOK___va_start
: {
3966 vtop
->type
.t
= VT_VOID
;
3969 case TOK___va_arg
: {
3982 case TOK___arm64_clear_cache
: {
3991 vtop
->type
.t
= VT_VOID
;
4006 t
= vtop
->type
.t
& VT_BTYPE
;
4008 /* In IEEE negate(x) isn't subtract(0,x), but rather
4013 else if (t
== VT_DOUBLE
)
4024 goto tok_identifier
;
4026 /* allow to take the address of a label */
4027 if (tok
< TOK_UIDENT
)
4028 expect("label identifier");
4029 s
= label_find(tok
);
4031 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
4033 if (s
->r
== LABEL_DECLARED
)
4034 s
->r
= LABEL_FORWARD
;
4037 s
->type
.t
= VT_VOID
;
4038 mk_pointer(&s
->type
);
4039 s
->type
.t
|= VT_STATIC
;
4041 vpushsym(&s
->type
, s
);
4045 // special qnan , snan and infinity values
4047 vpush64(VT_DOUBLE
, 0x7ff8000000000000ULL
);
4051 vpush64(VT_DOUBLE
, 0x7ff0000000000001ULL
);
4055 vpush64(VT_DOUBLE
, 0x7ff0000000000000ULL
);
4064 expect("identifier");
4067 const char *name
= get_tok_str(t
, NULL
);
4069 tcc_error("'%s' undeclared", name
);
4070 /* for simple function calls, we tolerate undeclared
4071 external reference to int() function */
4072 if (tcc_state
->warn_implicit_function_declaration
4073 #ifdef TCC_TARGET_PE
4074 /* people must be warned about using undeclared WINAPI functions
4075 (which usually start with uppercase letter) */
4076 || (name
[0] >= 'A' && name
[0] <= 'Z')
4079 tcc_warning("implicit declaration of function '%s'", name
);
4080 s
= external_global_sym(t
, &func_old_type
, 0);
4082 if ((s
->type
.t
& (VT_STATIC
| VT_INLINE
| VT_BTYPE
)) ==
4083 (VT_STATIC
| VT_INLINE
| VT_FUNC
)) {
4084 /* if referencing an inline function, then we generate a
4085 symbol to it if not already done. It will have the
4086 effect to generate code for it at the end of the
4087 compilation unit. Inline function as always
4088 generated in the text section. */
4090 put_extern_sym(s
, text_section
, 0, 0);
4091 r
= VT_SYM
| VT_CONST
;
4095 vset(&s
->type
, r
, s
->c
);
4096 /* if forward reference, we must point to s */
4097 if (vtop
->r
& VT_SYM
) {
4099 vtop
->c
.ptr_offset
= 0;
4104 /* post operations */
4106 if (tok
== TOK_INC
|| tok
== TOK_DEC
) {
4109 } else if (tok
== '.' || tok
== TOK_ARROW
) {
4112 if (tok
== TOK_ARROW
)
4114 qualifiers
= vtop
->type
.t
& (VT_CONSTANT
| VT_VOLATILE
);
4118 /* expect pointer on structure */
4119 if ((vtop
->type
.t
& VT_BTYPE
) != VT_STRUCT
)
4120 expect("struct or union");
4124 while ((s
= s
->next
) != NULL
) {
4129 tcc_error("field not found: %s", get_tok_str(tok
& ~SYM_FIELD
, NULL
));
4130 /* add field offset to pointer */
4131 vtop
->type
= char_pointer_type
; /* change type to 'char *' */
4134 /* change type to field type, and set to lvalue */
4135 vtop
->type
= s
->type
;
4136 vtop
->type
.t
|= qualifiers
;
4137 /* an array is never an lvalue */
4138 if (!(vtop
->type
.t
& VT_ARRAY
)) {
4139 vtop
->r
|= lvalue_type(vtop
->type
.t
);
4140 #ifdef CONFIG_TCC_BCHECK
4141 /* if bound checking, the referenced pointer must be checked */
4142 if (tcc_state
->do_bounds_check
)
4143 vtop
->r
|= VT_MUSTBOUND
;
4147 } else if (tok
== '[') {
4153 } else if (tok
== '(') {
4156 int nb_args
, ret_nregs
, ret_align
, regsize
, variadic
;
4159 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
4160 /* pointer test (no array accepted) */
4161 if ((vtop
->type
.t
& (VT_BTYPE
| VT_ARRAY
)) == VT_PTR
) {
4162 vtop
->type
= *pointed_type(&vtop
->type
);
4163 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
)
4167 expect("function pointer");
4170 vtop
->r
&= ~VT_LVAL
; /* no lvalue */
4172 /* get return type */
4175 sa
= s
->next
; /* first parameter */
4178 /* compute first implicit argument if a structure is returned */
4179 if ((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
4180 variadic
= (s
->c
== FUNC_ELLIPSIS
);
4181 ret_nregs
= gfunc_sret(&s
->type
, variadic
, &ret
.type
,
4182 &ret_align
, ®size
);
4184 /* get some space for the returned structure */
4185 size
= type_size(&s
->type
, &align
);
4186 #ifdef TCC_TARGET_ARM64
4187 /* On arm64, a small struct is return in registers.
4188 It is much easier to write it to memory if we know
4189 that we are allowed to write some extra bytes, so
4190 round the allocated space up to a power of 2: */
4192 while (size
& (size
- 1))
4193 size
= (size
| (size
- 1)) + 1;
4195 loc
= (loc
- size
) & -align
;
4197 ret
.r
= VT_LOCAL
| VT_LVAL
;
4198 /* pass it as 'int' to avoid structure arg passing
4200 vseti(VT_LOCAL
, loc
);
4210 /* return in register */
4211 if (is_float(ret
.type
.t
)) {
4212 ret
.r
= reg_fret(ret
.type
.t
);
4213 #ifdef TCC_TARGET_X86_64
4214 if ((ret
.type
.t
& VT_BTYPE
) == VT_QFLOAT
)
4218 #ifndef TCC_TARGET_ARM64
4219 #ifdef TCC_TARGET_X86_64
4220 if ((ret
.type
.t
& VT_BTYPE
) == VT_QLONG
)
4222 if ((ret
.type
.t
& VT_BTYPE
) == VT_LLONG
)
4233 gfunc_param_typed(s
, sa
);
4243 tcc_error("too few arguments to function");
4245 if (!nocode_wanted
) {
4246 gfunc_call(nb_args
);
4248 vtop
-= (nb_args
+ 1);
4252 for (r
= ret
.r
+ ret_nregs
+ !ret_nregs
; r
-- > ret
.r
;) {
4253 vsetc(&ret
.type
, r
, &ret
.c
);
4254 vtop
->r2
= ret
.r2
; /* Loop only happens when r2 is VT_CONST */
4257 /* handle packed struct return */
4258 if (((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) && ret_nregs
) {
4261 size
= type_size(&s
->type
, &align
);
4262 /* We're writing whole regs often, make sure there's enough
4263 space. Assume register size is power of 2. */
4264 if (regsize
> align
)
4266 loc
= (loc
- size
) & -align
;
4270 vset(&ret
.type
, VT_LOCAL
| VT_LVAL
, addr
+ offset
);
4274 if (--ret_nregs
== 0)
4278 vset(&s
->type
, VT_LOCAL
| VT_LVAL
, addr
);
4286 ST_FUNC
void expr_prod(void)
4291 while (tok
== '*' || tok
== '/' || tok
== '%') {
4299 ST_FUNC
void expr_sum(void)
4304 while (tok
== '+' || tok
== '-') {
4312 static void expr_shift(void)
4317 while (tok
== TOK_SHL
|| tok
== TOK_SAR
) {
4325 static void expr_cmp(void)
4330 while ((tok
>= TOK_ULE
&& tok
<= TOK_GT
) ||
4331 tok
== TOK_ULT
|| tok
== TOK_UGE
) {
4339 static void expr_cmpeq(void)
4344 while (tok
== TOK_EQ
|| tok
== TOK_NE
) {
4352 static void expr_and(void)
4355 while (tok
== '&') {
4362 static void expr_xor(void)
4365 while (tok
== '^') {
4372 static void expr_or(void)
4375 while (tok
== '|') {
4382 /* XXX: fix this mess */
4383 static void expr_land_const(void)
4386 while (tok
== TOK_LAND
) {
4393 /* XXX: fix this mess */
4394 static void expr_lor_const(void)
4397 while (tok
== TOK_LOR
) {
4404 /* only used if non constant */
4405 static void expr_land(void)
4410 if (tok
== TOK_LAND
) {
4415 if (tok
!= TOK_LAND
) {
4425 static void expr_lor(void)
4430 if (tok
== TOK_LOR
) {
4435 if (tok
!= TOK_LOR
) {
4445 /* XXX: better constant handling */
4446 static void expr_cond(void)
4448 int tt
, u
, r1
, r2
, rc
, t1
, t2
, bt1
, bt2
;
4450 CType type
, type1
, type2
;
4457 boolean
.t
= VT_BOOL
;
4463 if (tok
!= ':' || !gnu_ext
) {
4478 if (vtop
!= vstack
) {
4479 /* needed to avoid having different registers saved in
4481 if (is_float(vtop
->type
.t
)) {
4483 #ifdef TCC_TARGET_X86_64
4484 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4494 if (tok
== ':' && gnu_ext
) {
4502 sv
= *vtop
; /* save value to handle it later */
4503 vtop
--; /* no vpop so that FP stack is not flushed */
4511 bt1
= t1
& VT_BTYPE
;
4513 bt2
= t2
& VT_BTYPE
;
4514 /* cast operands to correct type according to ISOC rules */
4515 if (is_float(bt1
) || is_float(bt2
)) {
4516 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
4517 type
.t
= VT_LDOUBLE
;
4518 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
4523 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
4524 /* cast to biggest op */
4526 /* convert to unsigned if it does not fit in a long long */
4527 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
4528 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
4529 type
.t
|= VT_UNSIGNED
;
4530 } else if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
4531 /* If one is a null ptr constant the result type
4533 if (is_null_pointer (vtop
))
4535 else if (is_null_pointer (&sv
))
4537 /* XXX: test pointer compatibility, C99 has more elaborate
4541 } else if (bt1
== VT_FUNC
|| bt2
== VT_FUNC
) {
4542 /* XXX: test function pointer compatibility */
4543 type
= bt1
== VT_FUNC
? type1
: type2
;
4544 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
4545 /* XXX: test structure compatibility */
4546 type
= bt1
== VT_STRUCT
? type1
: type2
;
4547 } else if (bt1
== VT_VOID
|| bt2
== VT_VOID
) {
4548 /* NOTE: as an extension, we accept void on only one side */
4551 /* integer operations */
4553 /* convert to unsigned if it does not fit in an integer */
4554 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
4555 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
4556 type
.t
|= VT_UNSIGNED
;
4559 /* now we convert second operand */
4561 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4564 if (is_float(type
.t
)) {
4566 #ifdef TCC_TARGET_X86_64
4567 if ((type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4571 } else if ((type
.t
& VT_BTYPE
) == VT_LLONG
) {
4572 /* for long longs, we use fixed registers to avoid having
4573 to handle a complicated move */
4578 /* this is horrible, but we must also convert first
4582 /* put again first value and cast it */
4585 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4588 move_reg(r2
, r1
, type
.t
);
4595 static void expr_eq(void)
4601 (tok
>= TOK_A_MOD
&& tok
<= TOK_A_DIV
) ||
4602 tok
== TOK_A_XOR
|| tok
== TOK_A_OR
||
4603 tok
== TOK_A_SHL
|| tok
== TOK_A_SAR
) {
4618 ST_FUNC
void gexpr(void)
4629 /* parse an expression and return its type without any side effect. */
4630 static void expr_type(CType
*type
)
4632 int saved_nocode_wanted
;
4634 saved_nocode_wanted
= nocode_wanted
;
4639 nocode_wanted
= saved_nocode_wanted
;
4642 /* parse a unary expression and return its type without any side
4644 static void unary_type(CType
*type
)
4656 /* parse a constant expression and return value in vtop. */
4657 static void expr_const1(void)
4666 /* parse an integer constant and return its value. */
4667 ST_FUNC
int expr_const(void)
4671 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
4672 expect("constant expression");
4678 /* return the label token if current token is a label, otherwise
4680 static int is_label(void)
4684 /* fast test first */
4685 if (tok
< TOK_UIDENT
)
4687 /* no need to save tokc because tok is an identifier */
4694 unget_tok(last_tok
);
4699 static void label_or_decl(int l
)
4703 /* fast test first */
4704 if (tok
>= TOK_UIDENT
)
4706 /* no need to save tokc because tok is an identifier */
4710 unget_tok(last_tok
);
4713 unget_tok(last_tok
);
4718 static void block(int *bsym
, int *csym
, int *case_sym
, int *def_sym
,
4719 int case_reg
, int is_expr
)
4722 Sym
*s
, *frame_bottom
;
4724 /* generate line number info */
4725 if (tcc_state
->do_debug
&&
4726 (last_line_num
!= file
->line_num
|| last_ind
!= ind
)) {
4727 put_stabn(N_SLINE
, 0, file
->line_num
, ind
- func_ind
);
4729 last_line_num
= file
->line_num
;
4733 /* default return value is (void) */
4735 vtop
->type
.t
= VT_VOID
;
4738 if (tok
== TOK_IF
) {
4745 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4747 if (c
== TOK_ELSE
) {
4751 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4752 gsym(d
); /* patch else jmp */
4755 } else if (tok
== TOK_WHILE
) {
4763 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4767 } else if (tok
== '{') {
4769 int block_vla_sp_loc
, *saved_vla_sp_loc
, saved_vla_flags
;
4772 /* record local declaration stack position */
4774 frame_bottom
= sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
4775 frame_bottom
->next
= scope_stack_bottom
;
4776 scope_stack_bottom
= frame_bottom
;
4777 llabel
= local_label_stack
;
4779 /* save VLA state */
4780 block_vla_sp_loc
= *(saved_vla_sp_loc
= vla_sp_loc
);
4781 if (saved_vla_sp_loc
!= &vla_sp_root_loc
)
4782 vla_sp_loc
= &block_vla_sp_loc
;
4784 saved_vla_flags
= vla_flags
;
4785 vla_flags
|= VLA_NEED_NEW_FRAME
;
4787 /* handle local labels declarations */
4788 if (tok
== TOK_LABEL
) {
4791 if (tok
< TOK_UIDENT
)
4792 expect("label identifier");
4793 label_push(&local_label_stack
, tok
, LABEL_DECLARED
);
4803 while (tok
!= '}') {
4804 label_or_decl(VT_LOCAL
);
4808 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
4811 /* pop locally defined labels */
4812 label_pop(&local_label_stack
, llabel
);
4814 /* XXX: this solution makes only valgrind happy...
4815 triggered by gcc.c-torture/execute/20000917-1.c */
4817 switch(vtop
->type
.t
& VT_BTYPE
) {
4819 /* this breaks a compilation of the linux kernel v2.4.26 */
4820 /* pmd_t *new = ({ __asm__ __volatile__("ud2\n") ; ((pmd_t *)1); }); */
4821 /* Look a commit a80acab: Display error on statement expressions with complex return type */
4822 /* A pointer is not a complex return type */
4826 for(p
=vtop
->type
.ref
;p
;p
=p
->prev
)
4828 tcc_error("unsupported expression type");
4831 /* pop locally defined symbols */
4832 scope_stack_bottom
= scope_stack_bottom
->next
;
4833 sym_pop(&local_stack
, s
);
4835 /* Pop VLA frames and restore stack pointer if required */
4836 if (saved_vla_sp_loc
!= &vla_sp_root_loc
)
4837 *saved_vla_sp_loc
= block_vla_sp_loc
;
4838 if (vla_sp_loc
!= (saved_vla_sp_loc
== &vla_sp_root_loc
? &vla_sp_root_loc
: &block_vla_sp_loc
)) {
4839 vla_sp_loc
= saved_vla_sp_loc
;
4840 gen_vla_sp_restore(*vla_sp_loc
);
4842 vla_flags
= (vla_flags
& ~VLA_SCOPE_FLAGS
) | (saved_vla_flags
& VLA_SCOPE_FLAGS
);
4845 } else if (tok
== TOK_RETURN
) {
4849 gen_assign_cast(&func_vt
);
4850 #ifdef TCC_TARGET_ARM64
4851 // Perhaps it would be better to use this for all backends:
4854 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
4855 CType type
, ret_type
;
4856 int ret_align
, ret_nregs
, regsize
;
4857 ret_nregs
= gfunc_sret(&func_vt
, func_var
, &ret_type
,
4858 &ret_align
, ®size
);
4859 if (0 == ret_nregs
) {
4860 /* if returning structure, must copy it to implicit
4861 first pointer arg location */
4864 vset(&type
, VT_LOCAL
| VT_LVAL
, func_vc
);
4867 /* copy structure value to pointer */
4870 /* returning structure packed into registers */
4871 int r
, size
, addr
, align
;
4872 size
= type_size(&func_vt
,&align
);
4873 if ((vtop
->r
!= (VT_LOCAL
| VT_LVAL
) || (vtop
->c
.i
& (ret_align
-1)))
4874 && (align
& (ret_align
-1))) {
4875 loc
= (loc
- size
) & -align
;
4878 vset(&type
, VT_LOCAL
| VT_LVAL
, addr
);
4881 vset(&ret_type
, VT_LOCAL
| VT_LVAL
, addr
);
4883 vtop
->type
= ret_type
;
4884 if (is_float(ret_type
.t
))
4885 r
= rc_fret(ret_type
.t
);
4891 if (--ret_nregs
== 0)
4893 /* We assume that when a structure is returned in multiple
4894 registers, their classes are consecutive values of the
4896 /* XXX This seems confused, if r == 0, this never
4899 vtop
->c
.i
+= regsize
;
4900 vtop
->r
= VT_LOCAL
| VT_LVAL
;
4903 } else if (is_float(func_vt
.t
)) {
4904 gv(rc_fret(func_vt
.t
));
4909 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
4912 rsym
= gjmp(rsym
); /* jmp */
4913 } else if (tok
== TOK_BREAK
) {
4916 tcc_error("cannot break");
4917 *bsym
= gjmp(*bsym
);
4920 } else if (tok
== TOK_CONTINUE
) {
4923 tcc_error("cannot continue");
4924 *csym
= gjmp(*csym
);
4927 } else if (tok
== TOK_FOR
) {
4932 frame_bottom
= sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
4933 frame_bottom
->next
= scope_stack_bottom
;
4934 scope_stack_bottom
= frame_bottom
;
4936 /* c99 for-loop init decl? */
4937 if (!decl0(VT_LOCAL
, 1)) {
4938 /* no, regular for-loop init expr */
4962 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4966 scope_stack_bottom
= scope_stack_bottom
->next
;
4967 sym_pop(&local_stack
, s
);
4969 if (tok
== TOK_DO
) {
4974 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4985 if (tok
== TOK_SWITCH
) {
4989 /* XXX: other types than integer */
4990 case_reg
= gv(RC_INT
);
4994 b
= gjmp(0); /* jump to first case */
4996 block(&a
, csym
, &b
, &c
, case_reg
, 0);
4997 /* if no default, jmp after switch */
5005 if (tok
== TOK_CASE
) {
5012 if (gnu_ext
&& tok
== TOK_DOTS
) {
5016 tcc_warning("empty case range");
5018 /* since a case is like a label, we must skip it with a jmp */
5026 *case_sym
= gtst(1, 0);
5029 *case_sym
= gtst(1, 0);
5033 *case_sym
= gtst(1, *case_sym
);
5035 case_reg
= gv(RC_INT
);
5040 goto block_after_label
;
5042 if (tok
== TOK_DEFAULT
) {
5048 tcc_error("too many 'default'");
5051 goto block_after_label
;
5053 if (tok
== TOK_GOTO
) {
5055 if (tok
== '*' && gnu_ext
) {
5059 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
)
5062 } else if (tok
>= TOK_UIDENT
) {
5063 s
= label_find(tok
);
5064 /* put forward definition if needed */
5066 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
5068 if (s
->r
== LABEL_DECLARED
)
5069 s
->r
= LABEL_FORWARD
;
5071 /* label already defined */
5072 if (vla_flags
& VLA_IN_SCOPE
) {
5073 /* If VLAs are in use, save the current stack pointer and
5074 reset the stack pointer to what it was at function entry
5075 (label will restore stack pointer in inner scopes) */
5077 gen_vla_sp_restore(vla_sp_root_loc
);
5079 if (s
->r
& LABEL_FORWARD
)
5080 s
->jnext
= gjmp(s
->jnext
);
5082 gjmp_addr(s
->jnext
);
5085 expect("label identifier");
5088 } else if (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
) {
5094 if (vla_flags
& VLA_IN_SCOPE
) {
5095 /* save/restore stack pointer across label
5096 this is a no-op when combined with the load immediately
5097 after the label unless we arrive via goto */
5102 if (s
->r
== LABEL_DEFINED
)
5103 tcc_error("duplicate label '%s'", get_tok_str(s
->v
, NULL
));
5105 s
->r
= LABEL_DEFINED
;
5107 s
= label_push(&global_label_stack
, b
, LABEL_DEFINED
);
5110 if (vla_flags
& VLA_IN_SCOPE
) {
5111 gen_vla_sp_restore(*vla_sp_loc
);
5112 vla_flags
|= VLA_NEED_NEW_FRAME
;
5114 /* we accept this, but it is a mistake */
5117 tcc_warning("deprecated use of label at end of compound statement");
5121 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
5124 /* expression case */
5139 /* t is the array or struct type. c is the array or struct
5140 address. cur_index/cur_field is the pointer to the current
5141 value. 'size_only' is true if only size info is needed (only used
5143 static void decl_designator(CType
*type
, Section
*sec
, unsigned long c
,
5144 int *cur_index
, Sym
**cur_field
,
5145 int size_only
, int *par_count_p
)
5148 int notfirst
, index
, index_last
, align
, l
, nb_elems
, elem_size
;
5154 if (gnu_ext
&& (l
= is_label()) != 0)
5156 while (tok
== '[' || tok
== '.') {
5158 if (!(type
->t
& VT_ARRAY
))
5159 expect("array type");
5162 index
= expr_const();
5163 if (index
< 0 || (s
->c
>= 0 && index
>= s
->c
))
5164 expect("invalid index");
5165 if (tok
== TOK_DOTS
&& gnu_ext
) {
5167 index_last
= expr_const();
5168 if (index_last
< 0 ||
5169 (s
->c
>= 0 && index_last
>= s
->c
) ||
5171 expect("invalid index");
5177 *cur_index
= index_last
;
5178 type
= pointed_type(type
);
5179 elem_size
= type_size(type
, &align
);
5180 c
+= index
* elem_size
;
5181 /* NOTE: we only support ranges for last designator */
5182 nb_elems
= index_last
- index
+ 1;
5183 if (nb_elems
!= 1) {
5192 if ((type
->t
& VT_BTYPE
) != VT_STRUCT
)
5193 expect("struct/union type");
5206 /* XXX: fix this mess by using explicit storage field */
5208 type1
.t
|= (type
->t
& ~VT_TYPE
);
5222 if (type
->t
& VT_ARRAY
) {
5224 type
= pointed_type(type
);
5225 c
+= index
* type_size(type
, &align
);
5229 tcc_error("too many field init");
5230 /* XXX: fix this mess by using explicit storage field */
5232 type1
.t
|= (type
->t
& ~VT_TYPE
);
5237 decl_initializer(type
, sec
, c
, 0, size_only
, par_count_p
);
5239 /* XXX: make it more general */
5240 if (!size_only
&& nb_elems
> 1) {
5241 unsigned long c_end
;
5246 tcc_error("range init not supported yet for dynamic storage");
5247 c_end
= c
+ nb_elems
* elem_size
;
5248 if (c_end
> sec
->data_allocated
)
5249 section_realloc(sec
, c_end
);
5250 src
= sec
->data
+ c
;
5252 for(i
= 1; i
< nb_elems
; i
++) {
5254 memcpy(dst
, src
, elem_size
);
5260 #define EXPR_CONST 1
5263 /* store a value or an expression directly in global data or in local array */
5264 static void init_putv(CType
*type
, Section
*sec
, unsigned long c
,
5265 int v
, int expr_type
)
5267 int saved_global_expr
, bt
, bit_pos
, bit_size
;
5269 unsigned long long bit_mask
;
5277 /* compound literals must be allocated globally in this case */
5278 saved_global_expr
= global_expr
;
5281 global_expr
= saved_global_expr
;
5282 /* NOTE: symbols are accepted */
5283 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) != VT_CONST
)
5284 tcc_error("initializer element is not constant");
5292 dtype
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
5295 /* XXX: not portable */
5296 /* XXX: generate error if incorrect relocation */
5297 gen_assign_cast(&dtype
);
5298 bt
= type
->t
& VT_BTYPE
;
5299 /* we'll write at most 16 bytes */
5300 if (c
+ 16 > sec
->data_allocated
) {
5301 section_realloc(sec
, c
+ 16);
5303 ptr
= sec
->data
+ c
;
5304 /* XXX: make code faster ? */
5305 if (!(type
->t
& VT_BITFIELD
)) {
5310 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5311 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
5312 bit_mask
= (1LL << bit_size
) - 1;
5314 if ((vtop
->r
& VT_SYM
) &&
5320 (bt
== VT_INT
&& bit_size
!= 32)))
5321 tcc_error("initializer element is not computable at load time");
5323 /* XXX: when cross-compiling we assume that each type has the
5324 same representation on host and target, which is likely to
5325 be wrong in the case of long double */
5327 vtop
->c
.i
= (vtop
->c
.i
!= 0);
5329 *(char *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5332 *(short *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5335 *(double *)ptr
= vtop
->c
.d
;
5338 *(long double *)ptr
= vtop
->c
.ld
;
5341 *(long long *)ptr
|= (vtop
->c
.ll
& bit_mask
) << bit_pos
;
5344 addr_t val
= (vtop
->c
.ptr_offset
& bit_mask
) << bit_pos
;
5345 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
5346 if (vtop
->r
& VT_SYM
)
5347 greloca(sec
, vtop
->sym
, c
, R_DATA_PTR
, val
);
5349 *(addr_t
*)ptr
|= val
;
5351 if (vtop
->r
& VT_SYM
)
5352 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
5353 *(addr_t
*)ptr
|= val
;
5358 int val
= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5359 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
5360 if (vtop
->r
& VT_SYM
)
5361 greloca(sec
, vtop
->sym
, c
, R_DATA_PTR
, val
);
5365 if (vtop
->r
& VT_SYM
)
5366 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
5374 vset(&dtype
, VT_LOCAL
|VT_LVAL
, c
);
5381 /* put zeros for variable based init */
5382 static void init_putz(CType
*t
, Section
*sec
, unsigned long c
, int size
)
5385 /* nothing to do because globals are already set to zero */
5387 vpush_global_sym(&func_old_type
, TOK_memset
);
5389 #ifdef TCC_TARGET_ARM
5400 /* 't' contains the type and storage info. 'c' is the offset of the
5401 object in section 'sec'. If 'sec' is NULL, it means stack based
5402 allocation. 'first' is true if array '{' must be read (multi
5403 dimension implicit array init handling). 'size_only' is true if
5404 size only evaluation is wanted (only for arrays). */
5405 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
,
5406 int first
, int size_only
, int *par_count_p
)
5408 int index
, array_length
, n
, no_oblock
, nb
, parlevel
, parlevel1
, i
;
5409 int size1
, align1
, expr_type
;
5413 if (type
->t
& VT_VLA
) {
5416 /* save current stack pointer */
5417 if (vla_flags
& VLA_NEED_NEW_FRAME
) {
5419 vla_flags
= VLA_IN_SCOPE
;
5420 vla_sp_loc
= &vla_sp_loc_tmp
;
5423 vla_runtime_type_size(type
, &a
);
5424 gen_vla_alloc(type
, a
);
5425 vset(type
, VT_LOCAL
|VT_LVAL
, c
);
5429 } else if (type
->t
& VT_ARRAY
) {
5433 t1
= pointed_type(type
);
5434 size1
= type_size(t1
, &align1
);
5437 if ((first
&& tok
!= TOK_LSTR
&& tok
!= TOK_STR
) ||
5440 tcc_error("character array initializer must be a literal,"
5441 " optionally enclosed in braces");
5446 /* only parse strings here if correct type (otherwise: handle
5447 them as ((w)char *) expressions */
5448 if ((tok
== TOK_LSTR
&&
5449 #ifdef TCC_TARGET_PE
5450 (t1
->t
& VT_BTYPE
) == VT_SHORT
&& (t1
->t
& VT_UNSIGNED
)
5452 (t1
->t
& VT_BTYPE
) == VT_INT
5454 ) || (tok
== TOK_STR
&& (t1
->t
& VT_BTYPE
) == VT_BYTE
)) {
5455 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5460 /* compute maximum number of chars wanted */
5462 cstr_len
= cstr
->size
;
5464 cstr_len
= cstr
->size
/ sizeof(nwchar_t
);
5467 if (n
>= 0 && nb
> (n
- array_length
))
5468 nb
= n
- array_length
;
5471 tcc_warning("initializer-string for array is too long");
5472 /* in order to go faster for common case (char
5473 string in global variable, we handle it
5475 if (sec
&& tok
== TOK_STR
&& size1
== 1) {
5476 memcpy(sec
->data
+ c
+ array_length
, cstr
->data
, nb
);
5480 ch
= ((unsigned char *)cstr
->data
)[i
];
5482 ch
= ((nwchar_t
*)cstr
->data
)[i
];
5483 init_putv(t1
, sec
, c
+ (array_length
+ i
) * size1
,
5491 /* only add trailing zero if enough storage (no
5492 warning in this case since it is standard) */
5493 if (n
< 0 || array_length
< n
) {
5495 init_putv(t1
, sec
, c
+ (array_length
* size1
), 0, EXPR_VAL
);
5501 while (tok
!= '}') {
5502 decl_designator(type
, sec
, c
, &index
, NULL
, size_only
, par_count_p
);
5503 if (n
>= 0 && index
>= n
)
5504 tcc_error("index too large");
5505 /* must put zero in holes (note that doing it that way
5506 ensures that it even works with designators) */
5507 if (!size_only
&& array_length
< index
) {
5508 init_putz(t1
, sec
, c
+ array_length
* size1
,
5509 (index
- array_length
) * size1
);
5512 if (index
> array_length
)
5513 array_length
= index
;
5514 /* special test for multi dimensional arrays (may not
5515 be strictly correct if designators are used at the
5517 if (index
>= n
&& no_oblock
)
5519 if (*par_count_p
!= 0 && tok
== ')') {
5530 /* put zeros at the end */
5531 if (!size_only
&& n
>= 0 && array_length
< n
) {
5532 init_putz(t1
, sec
, c
+ array_length
* size1
,
5533 (n
- array_length
) * size1
);
5535 /* patch type size if needed */
5537 s
->c
= array_length
;
5538 } else if ((type
->t
& VT_BTYPE
) == VT_STRUCT
&&
5539 (sec
|| !first
|| tok
== '{')) {
5542 /* NOTE: the previous test is a specific case for automatic
5543 struct/union init */
5544 /* XXX: union needs only one init */
5546 /* XXX: this test is incorrect for local initializers
5547 beginning with ( without {. It would be much more difficult
5548 to do it correctly (ideally, the expression parser should
5549 be used in all cases) */
5555 while (tok
== '(') {
5559 if (!parse_btype(&type1
, &ad1
))
5561 type_decl(&type1
, &ad1
, &n
, TYPE_ABSTRACT
);
5563 if (!is_assignable_types(type
, &type1
))
5564 tcc_error("invalid type for cast");
5569 if (first
|| tok
== '{') {
5578 while (tok
!= '}') {
5579 decl_designator(type
, sec
, c
, NULL
, &f
, size_only
, &par_count
);
5581 if (!size_only
&& array_length
< index
) {
5582 init_putz(type
, sec
, c
+ array_length
,
5583 index
- array_length
);
5585 index
= index
+ type_size(&f
->type
, &align1
);
5586 if (index
> array_length
)
5587 array_length
= index
;
5589 /* gr: skip fields from same union - ugly. */
5592 int f_size
= type_size(&f
->type
, &align
);
5593 int f_type
= (f
->type
.t
& VT_BTYPE
);
5595 ///printf("index: %2d %08x -- %2d %08x\n", f->c, f->type.t, f->next->c, f->next->type.t);
5596 /* test for same offset */
5597 if (f
->next
->c
!= f
->c
)
5599 if ((f_type
== VT_STRUCT
) && (f_size
== 0)) {
5601 Lets assume a structure of size 0 can't be a member of the union.
5602 This allow to compile the following code from a linux kernel v2.4.26
5603 typedef struct { } rwlock_t;
5609 struct fs_struct init_fs = { { (1) }, (rwlock_t) {}, 0022, };
5610 tcc-0.9.23 can succesfully compile this version of the kernel.
5611 gcc don't have problems with this code too.
5615 /* if yes, test for bitfield shift */
5616 if ((f
->type
.t
& VT_BITFIELD
) && (f
->next
->type
.t
& VT_BITFIELD
)) {
5617 int bit_pos_1
= (f
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5618 int bit_pos_2
= (f
->next
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5619 //printf("bitfield %d %d\n", bit_pos_1, bit_pos_2);
5620 if (bit_pos_1
!= bit_pos_2
)
5627 if (no_oblock
&& f
== NULL
)
5633 /* put zeros at the end */
5634 if (!size_only
&& array_length
< n
) {
5635 init_putz(type
, sec
, c
+ array_length
,
5644 } else if (tok
== '{') {
5647 decl_initializer(type
, sec
, c
, first
, size_only
, &par_count
);
5649 } else if (size_only
) {
5650 /* just skip expression */
5651 parlevel
= parlevel1
= 0;
5652 while ((parlevel
> 0 || parlevel1
> 0 ||
5653 (tok
!= '}' && tok
!= ',')) && tok
!= -1) {
5656 else if (tok
== ')') {
5657 if (parlevel
== 0 && parlevel1
== 0)
5661 else if (tok
== '{')
5663 else if (tok
== '}') {
5664 if (parlevel
== 0 && parlevel1
== 0)
5671 /* currently, we always use constant expression for globals
5672 (may change for scripting case) */
5673 expr_type
= EXPR_CONST
;
5675 expr_type
= EXPR_ANY
;
5676 init_putv(type
, sec
, c
, 0, expr_type
);
5680 /* parse an initializer for type 't' if 'has_init' is non zero, and
5681 allocate space in local or global data space ('r' is either
5682 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
5683 variable 'v' with an associated name represented by 'asm_label' of
5684 scope 'scope' is declared before initializers are parsed. If 'v' is
5685 zero, then a reference to the new object is put in the value stack.
5686 If 'has_init' is 2, a special parsing is done to handle string
5688 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
,
5689 int has_init
, int v
, char *asm_label
,
5692 int size
, align
, addr
, data_offset
;
5694 ParseState saved_parse_state
= {0};
5695 TokenString init_str
;
5697 Sym
*flexible_array
;
5699 flexible_array
= NULL
;
5700 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
5701 Sym
*field
= type
->ref
->next
;
5704 field
= field
->next
;
5705 if (field
->type
.t
& VT_ARRAY
&& field
->type
.ref
->c
< 0)
5706 flexible_array
= field
;
5710 size
= type_size(type
, &align
);
5711 /* If unknown size, we must evaluate it before
5712 evaluating initializers because
5713 initializers can generate global data too
5714 (e.g. string pointers or ISOC99 compound
5715 literals). It also simplifies local
5716 initializers handling */
5717 tok_str_new(&init_str
);
5718 if (size
< 0 || (flexible_array
&& has_init
)) {
5721 tcc_error("unknown type size");
5722 /* get all init string */
5723 if (has_init
== 2) {
5724 /* only get strings */
5725 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5726 tok_str_add_tok(&init_str
);
5731 while (level
> 0 || (tok
!= ',' && tok
!= ';')) {
5733 tcc_error("unexpected end of file in initializer");
5734 tok_str_add_tok(&init_str
);
5737 else if (tok
== '}') {
5747 tok_str_add(&init_str
, -1);
5748 tok_str_add(&init_str
, 0);
5751 save_parse_state(&saved_parse_state
);
5753 macro_ptr
= init_str
.str
;
5755 decl_initializer(type
, NULL
, 0, 1, 1, &par_count
);
5756 /* prepare second initializer parsing */
5757 macro_ptr
= init_str
.str
;
5760 /* if still unknown size, error */
5761 size
= type_size(type
, &align
);
5763 tcc_error("unknown type size");
5766 size
+= flexible_array
->type
.ref
->c
* pointed_size(&flexible_array
->type
);
5767 /* take into account specified alignment if bigger */
5768 if (ad
->a
.aligned
) {
5769 if (ad
->a
.aligned
> align
)
5770 align
= ad
->a
.aligned
;
5771 } else if (ad
->a
.packed
) {
5774 if ((r
& VT_VALMASK
) == VT_LOCAL
) {
5776 #ifdef CONFIG_TCC_BCHECK
5777 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5781 loc
= (loc
- size
) & -align
;
5783 #ifdef CONFIG_TCC_BCHECK
5784 /* handles bounds */
5785 /* XXX: currently, since we do only one pass, we cannot track
5786 '&' operators, so we add only arrays */
5787 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5788 unsigned long *bounds_ptr
;
5789 /* add padding between regions */
5791 /* then add local bound info */
5792 bounds_ptr
= section_ptr_add(lbounds_section
, 2 * sizeof(unsigned long));
5793 bounds_ptr
[0] = addr
;
5794 bounds_ptr
[1] = size
;
5798 /* local variable */
5799 sym_push(v
, type
, r
, addr
);
5801 /* push local reference */
5802 vset(type
, r
, addr
);
5808 if (v
&& scope
== VT_CONST
) {
5809 /* see if the symbol was already defined */
5812 if (!is_compatible_types(&sym
->type
, type
))
5813 tcc_error("incompatible types for redefinition of '%s'",
5814 get_tok_str(v
, NULL
));
5815 if (sym
->type
.t
& VT_EXTERN
) {
5816 /* if the variable is extern, it was not allocated */
5817 sym
->type
.t
&= ~VT_EXTERN
;
5818 /* set array size if it was omitted in extern
5820 if ((sym
->type
.t
& VT_ARRAY
) &&
5821 sym
->type
.ref
->c
< 0 &&
5823 sym
->type
.ref
->c
= type
->ref
->c
;
5825 /* we accept several definitions of the same
5826 global variable. this is tricky, because we
5827 must play with the SHN_COMMON type of the symbol */
5828 /* XXX: should check if the variable was already
5829 initialized. It is incorrect to initialized it
5831 /* no init data, we won't add more to the symbol */
5838 /* allocate symbol in corresponding section */
5843 else if (tcc_state
->nocommon
)
5847 data_offset
= sec
->data_offset
;
5848 data_offset
= (data_offset
+ align
- 1) & -align
;
5850 /* very important to increment global pointer at this time
5851 because initializers themselves can create new initializers */
5852 data_offset
+= size
;
5853 #ifdef CONFIG_TCC_BCHECK
5854 /* add padding if bound check */
5855 if (tcc_state
->do_bounds_check
)
5858 sec
->data_offset
= data_offset
;
5859 /* allocate section space to put the data */
5860 if (sec
->sh_type
!= SHT_NOBITS
&&
5861 data_offset
> sec
->data_allocated
)
5862 section_realloc(sec
, data_offset
);
5863 /* align section if needed */
5864 if (align
> sec
->sh_addralign
)
5865 sec
->sh_addralign
= align
;
5867 addr
= 0; /* avoid warning */
5871 if (scope
!= VT_CONST
|| !sym
) {
5872 sym
= sym_push(v
, type
, r
| VT_SYM
, 0);
5873 sym
->asm_label
= asm_label
;
5875 /* update symbol definition */
5877 put_extern_sym(sym
, sec
, addr
, size
);
5880 /* put a common area */
5881 put_extern_sym(sym
, NULL
, align
, size
);
5882 /* XXX: find a nicer way */
5883 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
5884 esym
->st_shndx
= SHN_COMMON
;
5887 /* push global reference */
5888 sym
= get_sym_ref(type
, sec
, addr
, size
);
5889 vpushsym(type
, sym
);
5891 /* patch symbol weakness */
5892 if (type
->t
& VT_WEAK
)
5894 apply_visibility(sym
, type
);
5895 #ifdef CONFIG_TCC_BCHECK
5896 /* handles bounds now because the symbol must be defined
5897 before for the relocation */
5898 if (tcc_state
->do_bounds_check
) {
5899 unsigned long *bounds_ptr
;
5901 greloc(bounds_section
, sym
, bounds_section
->data_offset
, R_DATA_PTR
);
5902 /* then add global bound info */
5903 bounds_ptr
= section_ptr_add(bounds_section
, 2 * sizeof(long));
5904 bounds_ptr
[0] = 0; /* relocated */
5905 bounds_ptr
[1] = size
;
5909 if (has_init
|| (type
->t
& VT_VLA
)) {
5911 decl_initializer(type
, sec
, addr
, 1, 0, &par_count
);
5912 /* restore parse state if needed */
5914 tok_str_free(init_str
.str
);
5915 restore_parse_state(&saved_parse_state
);
5917 /* patch flexible array member size back to -1, */
5918 /* for possible subsequent similar declarations */
5920 flexible_array
->type
.ref
->c
= -1;
5925 static void put_func_debug(Sym
*sym
)
5930 /* XXX: we put here a dummy type */
5931 snprintf(buf
, sizeof(buf
), "%s:%c1",
5932 funcname
, sym
->type
.t
& VT_STATIC
? 'f' : 'F');
5933 put_stabs_r(buf
, N_FUN
, 0, file
->line_num
, 0,
5934 cur_text_section
, sym
->c
);
5935 /* //gr gdb wants a line at the function */
5936 put_stabn(N_SLINE
, 0, file
->line_num
, 0);
5941 /* parse an old style function declaration list */
5942 /* XXX: check multiple parameter */
5943 static void func_decl_list(Sym
*func_sym
)
5950 /* parse each declaration */
5951 while (tok
!= '{' && tok
!= ';' && tok
!= ',' && tok
!= TOK_EOF
&&
5952 tok
!= TOK_ASM1
&& tok
!= TOK_ASM2
&& tok
!= TOK_ASM3
) {
5953 if (!parse_btype(&btype
, &ad
))
5954 expect("declaration list");
5955 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
5956 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
5958 /* we accept no variable after */
5962 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
5963 /* find parameter in function parameter list */
5966 if ((s
->v
& ~SYM_FIELD
) == v
)
5970 tcc_error("declaration for parameter '%s' but no such parameter",
5971 get_tok_str(v
, NULL
));
5973 /* check that no storage specifier except 'register' was given */
5974 if (type
.t
& VT_STORAGE
)
5975 tcc_error("storage class specified for '%s'", get_tok_str(v
, NULL
));
5976 convert_parameter_type(&type
);
5977 /* we can add the type (NOTE: it could be local to the function) */
5979 /* accept other parameters */
5990 /* parse a function defined by symbol 'sym' and generate its code in
5991 'cur_text_section' */
5992 static void gen_function(Sym
*sym
)
5994 int saved_nocode_wanted
= nocode_wanted
;
5996 ind
= cur_text_section
->data_offset
;
5997 /* NOTE: we patch the symbol size later */
5998 put_extern_sym(sym
, cur_text_section
, ind
, 0);
5999 funcname
= get_tok_str(sym
->v
, NULL
);
6001 /* Initialize VLA state */
6002 vla_sp_loc
= &vla_sp_root_loc
;
6003 vla_flags
= VLA_NEED_NEW_FRAME
;
6004 /* put debug symbol */
6005 if (tcc_state
->do_debug
)
6006 put_func_debug(sym
);
6007 /* push a dummy symbol to enable local sym storage */
6008 sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
6009 gfunc_prolog(&sym
->type
);
6010 #ifdef CONFIG_TCC_BCHECK
6011 if (tcc_state
->do_bounds_check
6012 && !strcmp(get_tok_str(sym
->v
, NULL
), "main")) {
6016 for (i
= 0, sym
= local_stack
; i
< 2; i
++, sym
= sym
->prev
) {
6017 if (sym
->v
& SYM_FIELD
|| sym
->prev
->v
& SYM_FIELD
)
6019 vpush_global_sym(&func_old_type
, TOK___bound_main_arg
);
6020 vset(&sym
->type
, sym
->r
, sym
->c
);
6026 block(NULL
, NULL
, NULL
, NULL
, 0, 0);
6029 cur_text_section
->data_offset
= ind
;
6030 label_pop(&global_label_stack
, NULL
);
6031 /* reset local stack */
6032 scope_stack_bottom
= NULL
;
6033 sym_pop(&local_stack
, NULL
);
6034 /* end of function */
6035 /* patch symbol size */
6036 ((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
].st_size
=
6038 /* patch symbol weakness (this definition overrules any prototype) */
6039 if (sym
->type
.t
& VT_WEAK
)
6041 apply_visibility(sym
, &sym
->type
);
6042 if (tcc_state
->do_debug
) {
6043 put_stabn(N_FUN
, 0, 0, ind
- func_ind
);
6045 /* It's better to crash than to generate wrong code */
6046 cur_text_section
= NULL
;
6047 funcname
= ""; /* for safety */
6048 func_vt
.t
= VT_VOID
; /* for safety */
6049 func_var
= 0; /* for safety */
6050 ind
= 0; /* for safety */
6051 nocode_wanted
= saved_nocode_wanted
;
6054 ST_FUNC
void gen_inline_functions(void)
6057 int *str
, inline_generated
, i
;
6058 struct InlineFunc
*fn
;
6060 /* iterate while inline function are referenced */
6062 inline_generated
= 0;
6063 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
6064 fn
= tcc_state
->inline_fns
[i
];
6066 if (sym
&& sym
->c
) {
6067 /* the function was used: generate its code and
6068 convert it to a normal function */
6069 str
= fn
->token_str
;
6072 pstrcpy(file
->filename
, sizeof file
->filename
, fn
->filename
);
6073 sym
->r
= VT_SYM
| VT_CONST
;
6074 sym
->type
.t
&= ~VT_INLINE
;
6078 cur_text_section
= text_section
;
6080 macro_ptr
= NULL
; /* fail safe */
6082 inline_generated
= 1;
6085 if (!inline_generated
)
6088 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
6089 fn
= tcc_state
->inline_fns
[i
];
6090 str
= fn
->token_str
;
6093 dynarray_reset(&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
);
6096 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
6097 static int decl0(int l
, int is_for_loop_init
)
6105 if (!parse_btype(&btype
, &ad
)) {
6106 if (is_for_loop_init
)
6108 /* skip redundant ';' */
6109 /* XXX: find more elegant solution */
6114 if (l
== VT_CONST
&&
6115 (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
6116 /* global asm block */
6120 /* special test for old K&R protos without explicit int
6121 type. Only accepted when defining global data */
6122 if (l
== VT_LOCAL
|| tok
< TOK_DEFINE
)
6126 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
6127 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
6129 /* we accept no variable after */
6133 while (1) { /* iterate thru each declaration */
6134 char *asm_label
; // associated asm label
6136 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
6140 type_to_str(buf
, sizeof(buf
), t
, get_tok_str(v
, NULL
));
6141 printf("type = '%s'\n", buf
);
6144 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
6145 if ((type
.t
& VT_STATIC
) && (l
== VT_LOCAL
)) {
6146 tcc_error("function without file scope cannot be static");
6148 /* if old style function prototype, we accept a
6151 if (sym
->c
== FUNC_OLD
)
6152 func_decl_list(sym
);
6156 if (gnu_ext
&& (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
6159 asm_label_instr(&astr
);
6160 asm_label
= tcc_strdup(astr
.data
);
6163 /* parse one last attribute list, after asm label */
6164 parse_attribute(&ad
);
6169 #ifdef TCC_TARGET_PE
6170 if (ad
.a
.func_import
)
6171 type
.t
|= VT_IMPORT
;
6172 if (ad
.a
.func_export
)
6173 type
.t
|= VT_EXPORT
;
6175 type
.t
|= ad
.a
.visibility
<< VT_VIS_SHIFT
;
6179 tcc_error("cannot use local functions");
6180 if ((type
.t
& VT_BTYPE
) != VT_FUNC
)
6181 expect("function definition");
6183 /* reject abstract declarators in function definition */
6185 while ((sym
= sym
->next
) != NULL
)
6186 if (!(sym
->v
& ~SYM_FIELD
))
6187 expect("identifier");
6189 /* XXX: cannot do better now: convert extern line to static inline */
6190 if ((type
.t
& (VT_EXTERN
| VT_INLINE
)) == (VT_EXTERN
| VT_INLINE
))
6191 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
6196 if ((sym
->type
.t
& VT_BTYPE
) != VT_FUNC
)
6199 ref
= sym
->type
.ref
;
6200 if (0 == ref
->a
.func_proto
)
6201 tcc_error("redefinition of '%s'", get_tok_str(v
, NULL
));
6203 /* use func_call from prototype if not defined */
6204 if (ref
->a
.func_call
!= FUNC_CDECL
6205 && type
.ref
->a
.func_call
== FUNC_CDECL
)
6206 type
.ref
->a
.func_call
= ref
->a
.func_call
;
6208 /* use export from prototype */
6209 if (ref
->a
.func_export
)
6210 type
.ref
->a
.func_export
= 1;
6212 /* use static from prototype */
6213 if (sym
->type
.t
& VT_STATIC
)
6214 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
6216 /* If the definition has no visibility use the
6217 one from prototype. */
6218 if (! (type
.t
& VT_VIS_MASK
))
6219 type
.t
|= sym
->type
.t
& VT_VIS_MASK
;
6221 if (!is_compatible_types(&sym
->type
, &type
)) {
6223 tcc_error("incompatible types for redefinition of '%s'",
6224 get_tok_str(v
, NULL
));
6226 type
.ref
->a
.func_proto
= 0;
6227 /* if symbol is already defined, then put complete type */
6230 /* put function symbol */
6231 sym
= global_identifier_push(v
, type
.t
, 0);
6232 sym
->type
.ref
= type
.ref
;
6235 /* static inline functions are just recorded as a kind
6236 of macro. Their code will be emitted at the end of
6237 the compilation unit only if they are used */
6238 if ((type
.t
& (VT_INLINE
| VT_STATIC
)) ==
6239 (VT_INLINE
| VT_STATIC
)) {
6240 TokenString func_str
;
6242 struct InlineFunc
*fn
;
6243 const char *filename
;
6245 tok_str_new(&func_str
);
6251 tcc_error("unexpected end of file");
6252 tok_str_add_tok(&func_str
);
6257 } else if (t
== '}') {
6259 if (block_level
== 0)
6263 tok_str_add(&func_str
, -1);
6264 tok_str_add(&func_str
, 0);
6265 filename
= file
? file
->filename
: "";
6266 fn
= tcc_malloc(sizeof *fn
+ strlen(filename
));
6267 strcpy(fn
->filename
, filename
);
6269 fn
->token_str
= func_str
.str
;
6270 dynarray_add((void ***)&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
, fn
);
6273 /* compute text section */
6274 cur_text_section
= ad
.section
;
6275 if (!cur_text_section
)
6276 cur_text_section
= text_section
;
6277 sym
->r
= VT_SYM
| VT_CONST
;
6282 if (btype
.t
& VT_TYPEDEF
) {
6283 /* save typedefed type */
6284 /* XXX: test storage specifiers ? */
6285 sym
= sym_push(v
, &type
, 0, 0);
6287 sym
->type
.t
|= VT_TYPEDEF
;
6290 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
6291 /* external function definition */
6292 /* specific case for func_call attribute */
6293 ad
.a
.func_proto
= 1;
6295 } else if (!(type
.t
& VT_ARRAY
)) {
6296 /* not lvalue if array */
6297 r
|= lvalue_type(type
.t
);
6299 has_init
= (tok
== '=');
6300 if (has_init
&& (type
.t
& VT_VLA
))
6301 tcc_error("Variable length array cannot be initialized");
6302 if ((btype
.t
& VT_EXTERN
) || ((type
.t
& VT_BTYPE
) == VT_FUNC
) ||
6303 ((type
.t
& VT_ARRAY
) && (type
.t
& VT_STATIC
) &&
6304 !has_init
&& l
== VT_CONST
&& type
.ref
->c
< 0)) {
6305 /* external variable or function */
6306 /* NOTE: as GCC, uninitialized global static
6307 arrays of null size are considered as
6309 sym
= external_sym(v
, &type
, r
, asm_label
);
6311 if (ad
.alias_target
) {
6316 alias_target
= sym_find(ad
.alias_target
);
6317 if (!alias_target
|| !alias_target
->c
)
6318 tcc_error("unsupported forward __alias__ attribute");
6319 esym
= &((Elf32_Sym
*)symtab_section
->data
)[alias_target
->c
];
6320 tsec
.sh_num
= esym
->st_shndx
;
6321 put_extern_sym2(sym
, &tsec
, esym
->st_value
, esym
->st_size
, 0);
6324 type
.t
|= (btype
.t
& VT_STATIC
); /* Retain "static". */
6325 if (type
.t
& VT_STATIC
)
6331 decl_initializer_alloc(&type
, &ad
, r
, has_init
, v
, asm_label
, l
);
6335 if (is_for_loop_init
)
6348 ST_FUNC
void decl(int l
)