2 * TCC - Tiny C Compiler
4 * Copyright (c) 2001-2004 Fabrice Bellard
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 /********************************************************/
24 /* global variables */
26 /* loc : local variable index
27 ind : output code index
29 anon_sym: anonymous symbol index
31 ST_DATA
int rsym
, anon_sym
, ind
, loc
;
33 ST_DATA Section
*text_section
, *data_section
, *bss_section
; /* predefined sections */
34 ST_DATA Section
*cur_text_section
; /* current section where function code is generated */
36 ST_DATA Section
*last_text_section
; /* to handle .previous asm directive */
38 #ifdef CONFIG_TCC_BCHECK
39 /* bound check related sections */
40 ST_DATA Section
*bounds_section
; /* contains global data bound description */
41 ST_DATA Section
*lbounds_section
; /* contains local data bound description */
44 ST_DATA Section
*symtab_section
, *strtab_section
;
46 ST_DATA Section
*stab_section
, *stabstr_section
;
47 ST_DATA Sym
*sym_free_first
;
48 ST_DATA
void **sym_pools
;
49 ST_DATA
int nb_sym_pools
;
51 ST_DATA Sym
*global_stack
;
52 ST_DATA Sym
*local_stack
;
53 ST_DATA Sym
*scope_stack_bottom
;
54 ST_DATA Sym
*define_stack
;
55 ST_DATA Sym
*global_label_stack
;
56 ST_DATA Sym
*local_label_stack
;
58 ST_DATA
int vla_sp_loc_tmp
; /* vla_sp_loc is set to this when the value won't be needed later */
59 ST_DATA
int vla_sp_root_loc
; /* vla_sp_loc for SP before any VLAs were pushed */
60 ST_DATA
int *vla_sp_loc
; /* Pointer to variable holding location to store stack pointer on the stack when modifying stack pointer */
61 ST_DATA
int vla_flags
; /* VLA_* flags */
63 ST_DATA SValue __vstack
[1+VSTACK_SIZE
], *vtop
;
65 ST_DATA
int const_wanted
; /* true if constant wanted */
66 ST_DATA
int nocode_wanted
; /* true if no code generation wanted for an expression */
67 ST_DATA
int global_expr
; /* true if compound literals must be allocated globally (used during initializers parsing */
68 ST_DATA CType func_vt
; /* current function return type (used by return instruction) */
69 ST_DATA
int func_var
; /* true if current function is variadic (used by return instruction) */
71 ST_DATA
int last_line_num
, last_ind
, func_ind
; /* debug last line number and pc */
72 ST_DATA
char *funcname
;
74 ST_DATA CType char_pointer_type
, func_old_type
, int_type
, size_type
;
76 /* ------------------------------------------------------------------------- */
77 static void gen_cast(CType
*type
);
78 static inline CType
*pointed_type(CType
*type
);
79 static int is_compatible_types(CType
*type1
, CType
*type2
);
80 static int parse_btype(CType
*type
, AttributeDef
*ad
);
81 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
);
82 static void parse_expr_type(CType
*type
);
83 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
, int first
, int size_only
);
84 static void block(int *bsym
, int *csym
, int *case_sym
, int *def_sym
, int case_reg
, int is_expr
);
85 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
, int has_init
, int v
, char *asm_label
, int scope
);
86 static int decl0(int l
, int is_for_loop_init
);
87 static void expr_eq(void);
88 static void unary_type(CType
*type
);
89 static void vla_runtime_type_size(CType
*type
, int *a
);
90 static void vla_sp_save(void);
91 static int is_compatible_parameter_types(CType
*type1
, CType
*type2
);
92 static void expr_type(CType
*type
);
93 ST_FUNC
void vpush64(int ty
, unsigned long long v
);
94 ST_FUNC
void vpush(CType
*type
);
95 ST_FUNC
int gvtst(int inv
, int t
);
96 ST_FUNC
int is_btype_size(int bt
);
98 ST_INLN
int is_float(int t
)
102 return bt
== VT_LDOUBLE
|| bt
== VT_DOUBLE
|| bt
== VT_FLOAT
|| bt
== VT_QFLOAT
;
105 /* we use our own 'finite' function to avoid potential problems with
106 non standard math libs */
107 /* XXX: endianness dependent */
108 ST_FUNC
int ieee_finite(double d
)
111 memcpy(p
, &d
, sizeof(double));
112 return ((unsigned)((p
[1] | 0x800fffff) + 1)) >> 31;
115 ST_FUNC
void test_lvalue(void)
117 if (!(vtop
->r
& VT_LVAL
))
121 /* ------------------------------------------------------------------------- */
122 /* symbol allocator */
123 static Sym
*__sym_malloc(void)
125 Sym
*sym_pool
, *sym
, *last_sym
;
128 sym_pool
= tcc_malloc(SYM_POOL_NB
* sizeof(Sym
));
129 dynarray_add(&sym_pools
, &nb_sym_pools
, sym_pool
);
131 last_sym
= sym_free_first
;
133 for(i
= 0; i
< SYM_POOL_NB
; i
++) {
134 sym
->next
= last_sym
;
138 sym_free_first
= last_sym
;
142 static inline Sym
*sym_malloc(void)
145 sym
= sym_free_first
;
147 sym
= __sym_malloc();
148 sym_free_first
= sym
->next
;
152 ST_INLN
void sym_free(Sym
*sym
)
154 sym
->next
= sym_free_first
;
155 tcc_free(sym
->asm_label
);
156 sym_free_first
= sym
;
159 /* push, without hashing */
160 ST_FUNC Sym
*sym_push2(Sym
**ps
, int v
, int t
, long c
)
163 if (ps
== &local_stack
) {
164 for (s
= *ps
; s
&& s
!= scope_stack_bottom
; s
= s
->prev
)
165 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
&& s
->v
== v
)
166 tcc_error("incompatible types for redefinition of '%s'",
167 get_tok_str(v
, NULL
));
185 /* find a symbol and return its associated structure. 's' is the top
186 of the symbol stack */
187 ST_FUNC Sym
*sym_find2(Sym
*s
, int v
)
199 /* structure lookup */
200 ST_INLN Sym
*struct_find(int v
)
203 if ((unsigned)v
>= (unsigned)(tok_ident
- TOK_IDENT
))
205 return table_ident
[v
]->sym_struct
;
208 /* find an identifier */
209 ST_INLN Sym
*sym_find(int v
)
212 if ((unsigned)v
>= (unsigned)(tok_ident
- TOK_IDENT
))
214 return table_ident
[v
]->sym_identifier
;
217 /* push a given symbol on the symbol stack */
218 ST_FUNC Sym
*sym_push(int v
, CType
*type
, int r
, int c
)
227 s
= sym_push2(ps
, v
, type
->t
, c
);
228 s
->type
.ref
= type
->ref
;
230 /* don't record fields or anonymous symbols */
232 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
233 /* record symbol in token array */
234 ts
= table_ident
[(v
& ~SYM_STRUCT
) - TOK_IDENT
];
236 ps
= &ts
->sym_struct
;
238 ps
= &ts
->sym_identifier
;
245 /* push a global identifier */
246 ST_FUNC Sym
*global_identifier_push(int v
, int t
, int c
)
249 s
= sym_push2(&global_stack
, v
, t
, c
);
250 /* don't record anonymous symbol */
251 if (v
< SYM_FIRST_ANOM
) {
252 ps
= &table_ident
[v
- TOK_IDENT
]->sym_identifier
;
253 /* modify the top most local identifier, so that
254 sym_identifier will point to 's' when popped */
256 ps
= &(*ps
)->prev_tok
;
263 /* pop symbols until top reaches 'b' */
264 ST_FUNC
void sym_pop(Sym
**ptop
, Sym
*b
)
274 /* remove symbol in token array */
276 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
277 ts
= table_ident
[(v
& ~SYM_STRUCT
) - TOK_IDENT
];
279 ps
= &ts
->sym_struct
;
281 ps
= &ts
->sym_identifier
;
290 static void weaken_symbol(Sym
*sym
)
292 sym
->type
.t
|= VT_WEAK
;
297 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
298 esym_type
= ELFW(ST_TYPE
)(esym
->st_info
);
299 esym
->st_info
= ELFW(ST_INFO
)(STB_WEAK
, esym_type
);
303 static void apply_visibility(Sym
*sym
, CType
*type
)
305 int vis
= sym
->type
.t
& VT_VIS_MASK
;
306 int vis2
= type
->t
& VT_VIS_MASK
;
307 if (vis
== (STV_DEFAULT
<< VT_VIS_SHIFT
))
309 else if (vis2
== (STV_DEFAULT
<< VT_VIS_SHIFT
))
312 vis
= (vis
< vis2
) ? vis
: vis2
;
313 sym
->type
.t
&= ~VT_VIS_MASK
;
319 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
320 vis
>>= VT_VIS_SHIFT
;
321 esym
->st_other
= (esym
->st_other
& ~ELFW(ST_VISIBILITY
)(-1)) | vis
;
325 /* ------------------------------------------------------------------------- */
327 ST_FUNC
void swap(int *p
, int *q
)
335 static void vsetc(CType
*type
, int r
, CValue
*vc
)
339 if (vtop
>= vstack
+ (VSTACK_SIZE
- 1))
340 tcc_error("memory full (vstack)");
341 /* cannot let cpu flags if other instruction are generated. Also
342 avoid leaving VT_JMP anywhere except on the top of the stack
343 because it would complicate the code generator. */
344 if (vtop
>= vstack
) {
345 v
= vtop
->r
& VT_VALMASK
;
346 if (v
== VT_CMP
|| (v
& ~1) == VT_JMP
)
356 /* push constant of type "type" with useless value */
357 ST_FUNC
void vpush(CType
*type
)
360 vsetc(type
, VT_CONST
, &cval
);
363 /* push integer constant */
364 ST_FUNC
void vpushi(int v
)
368 vsetc(&int_type
, VT_CONST
, &cval
);
371 /* push a pointer sized constant */
372 static void vpushs(addr_t v
)
376 vsetc(&size_type
, VT_CONST
, &cval
);
379 /* push arbitrary 64bit constant */
380 ST_FUNC
void vpush64(int ty
, unsigned long long v
)
387 vsetc(&ctype
, VT_CONST
, &cval
);
390 /* push long long constant */
391 static inline void vpushll(long long v
)
393 vpush64(VT_LLONG
, v
);
396 /* push a symbol value of TYPE */
397 static inline void vpushsym(CType
*type
, Sym
*sym
)
401 vsetc(type
, VT_CONST
| VT_SYM
, &cval
);
405 /* Return a static symbol pointing to a section */
406 ST_FUNC Sym
*get_sym_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
412 sym
= global_identifier_push(v
, type
->t
| VT_STATIC
, 0);
413 sym
->type
.ref
= type
->ref
;
414 sym
->r
= VT_CONST
| VT_SYM
;
415 put_extern_sym(sym
, sec
, offset
, size
);
419 /* push a reference to a section offset by adding a dummy symbol */
420 static void vpush_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
422 vpushsym(type
, get_sym_ref(type
, sec
, offset
, size
));
425 /* define a new external reference to a symbol 'v' of type 'u' */
426 ST_FUNC Sym
*external_global_sym(int v
, CType
*type
, int r
)
432 /* push forward reference */
433 s
= global_identifier_push(v
, type
->t
| VT_EXTERN
, 0);
434 s
->type
.ref
= type
->ref
;
435 s
->r
= r
| VT_CONST
| VT_SYM
;
440 /* define a new external reference to a symbol 'v' with alternate asm
441 name 'asm_label' of type 'u'. 'asm_label' is equal to NULL if there
442 is no alternate name (most cases) */
443 static Sym
*external_sym(int v
, CType
*type
, int r
, char *asm_label
)
449 /* push forward reference */
450 s
= sym_push(v
, type
, r
| VT_CONST
| VT_SYM
, 0);
451 s
->asm_label
= asm_label
;
452 s
->type
.t
|= VT_EXTERN
;
453 } else if (s
->type
.ref
== func_old_type
.ref
) {
454 s
->type
.ref
= type
->ref
;
455 s
->r
= r
| VT_CONST
| VT_SYM
;
456 s
->type
.t
|= VT_EXTERN
;
457 } else if (!is_compatible_types(&s
->type
, type
)) {
458 tcc_error("incompatible types for redefinition of '%s'",
459 get_tok_str(v
, NULL
));
461 /* Merge some storage attributes. */
462 if (type
->t
& VT_WEAK
)
465 if (type
->t
& VT_VIS_MASK
)
466 apply_visibility(s
, type
);
471 /* push a reference to global symbol v */
472 ST_FUNC
void vpush_global_sym(CType
*type
, int v
)
474 vpushsym(type
, external_global_sym(v
, type
, 0));
477 ST_FUNC
void vset(CType
*type
, int r
, int v
)
482 vsetc(type
, r
, &cval
);
485 static void vseti(int r
, int v
)
493 ST_FUNC
void vswap(void)
496 /* cannot let cpu flags if other instruction are generated. Also
497 avoid leaving VT_JMP anywhere except on the top of the stack
498 because it would complicate the code generator. */
499 if (vtop
>= vstack
) {
500 int v
= vtop
->r
& VT_VALMASK
;
501 if (v
== VT_CMP
|| (v
& ~1) == VT_JMP
)
508 /* XXX: +2% overall speed possible with optimized memswap
510 * memswap(&vtop[0], &vtop[1], sizeof *vtop);
514 ST_FUNC
void vpushv(SValue
*v
)
516 if (vtop
>= vstack
+ (VSTACK_SIZE
- 1))
517 tcc_error("memory full (vstack)");
522 static void vdup(void)
527 /* save r to the memory stack, and mark it as being free */
528 ST_FUNC
void save_reg(int r
)
530 int l
, saved
, size
, align
;
534 /* modify all stack values */
537 for(p
=vstack
;p
<=vtop
;p
++) {
538 if ((p
->r
& VT_VALMASK
) == r
||
539 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& (p
->r2
& VT_VALMASK
) == r
)) {
540 /* must save value on stack if not already done */
542 /* NOTE: must reload 'r' because r might be equal to r2 */
543 r
= p
->r
& VT_VALMASK
;
544 /* store register in the stack */
546 if ((p
->r
& VT_LVAL
) ||
547 (!is_float(type
->t
) && (type
->t
& VT_BTYPE
) != VT_LLONG
))
548 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
549 type
= &char_pointer_type
;
553 size
= type_size(type
, &align
);
554 loc
= (loc
- size
) & -align
;
556 sv
.r
= VT_LOCAL
| VT_LVAL
;
559 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
560 /* x86 specific: need to pop fp register ST0 if saved */
562 o(0xd8dd); /* fstp %st(0) */
565 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
566 /* special long long case */
567 if ((type
->t
& VT_BTYPE
) == VT_LLONG
) {
575 /* mark that stack entry as being saved on the stack */
576 if (p
->r
& VT_LVAL
) {
577 /* also clear the bounded flag because the
578 relocation address of the function was stored in
580 p
->r
= (p
->r
& ~(VT_VALMASK
| VT_BOUNDED
)) | VT_LLOCAL
;
582 p
->r
= lvalue_type(p
->type
.t
) | VT_LOCAL
;
590 #ifdef TCC_TARGET_ARM
591 /* find a register of class 'rc2' with at most one reference on stack.
592 * If none, call get_reg(rc) */
593 ST_FUNC
int get_reg_ex(int rc
, int rc2
)
598 for(r
=0;r
<NB_REGS
;r
++) {
599 if (reg_classes
[r
] & rc2
) {
602 for(p
= vstack
; p
<= vtop
; p
++) {
603 if ((p
->r
& VT_VALMASK
) == r
||
604 (p
->r2
& VT_VALMASK
) == r
)
615 /* find a free register of class 'rc'. If none, save one register */
616 ST_FUNC
int get_reg(int rc
)
621 /* find a free register */
622 for(r
=0;r
<NB_REGS
;r
++) {
623 if (reg_classes
[r
] & rc
) {
624 for(p
=vstack
;p
<=vtop
;p
++) {
625 if ((p
->r
& VT_VALMASK
) == r
||
626 (p
->r2
& VT_VALMASK
) == r
)
634 /* no register left : free the first one on the stack (VERY
635 IMPORTANT to start from the bottom to ensure that we don't
636 spill registers used in gen_opi()) */
637 for(p
=vstack
;p
<=vtop
;p
++) {
638 /* look at second register (if long long) */
639 r
= p
->r2
& VT_VALMASK
;
640 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
))
642 r
= p
->r
& VT_VALMASK
;
643 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
)) {
649 /* Should never comes here */
653 /* save registers up to (vtop - n) stack entry */
654 ST_FUNC
void save_regs(int n
)
659 for(p
= vstack
;p
<= p1
; p
++) {
660 r
= p
->r
& VT_VALMASK
;
667 /* move register 's' (of type 't') to 'r', and flush previous value of r to memory
669 static void move_reg(int r
, int s
, int t
)
683 /* get address of vtop (vtop MUST BE an lvalue) */
684 ST_FUNC
void gaddrof(void)
686 if (vtop
->r
& VT_REF
&& !nocode_wanted
)
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
&& !nocode_wanted
)
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
&& !nocode_wanted
) {
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
&& !nocode_wanted
) {
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
&& !nocode_wanted
) {
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
&& !nocode_wanted
) {
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 if (!nocode_wanted
) {
2618 #ifdef CONFIG_TCC_BCHECK
2619 /* bound check case */
2620 if (vtop
[-1].r
& VT_MUSTBOUND
) {
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 */
2690 gv_dup(); /* duplicate value */
2692 vdup(); /* duplicate value */
2697 vpushi(c
- TOK_MID
);
2699 vstore(); /* store value */
2701 vpop(); /* if post op, return saved value */
2704 /* Parse GNUC __attribute__ extension. Currently, the following
2705 extensions are recognized:
2706 - aligned(n) : set data/function alignment.
2707 - packed : force data alignment to 1
2708 - section(x) : generate data/code in this section.
2709 - unused : currently ignored, but may be used someday.
2710 - regparm(n) : pass function parameters in registers (i386 only)
2712 static void parse_attribute(AttributeDef
*ad
)
2716 while (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
) {
2720 while (tok
!= ')') {
2721 if (tok
< TOK_IDENT
)
2722 expect("attribute name");
2730 expect("section name");
2731 ad
->section
= find_section(tcc_state
, (char *)tokc
.cstr
->data
);
2739 expect("alias(\"target\")");
2740 ad
->alias_target
= /* save string as token, for later */
2741 tok_alloc((char*)tokc
.cstr
->data
, tokc
.cstr
->size
-1)->tok
;
2745 case TOK_VISIBILITY1
:
2746 case TOK_VISIBILITY2
:
2749 expect("visibility(\"default|hidden|internal|protected\")");
2750 if (!strcmp (tokc
.cstr
->data
, "default"))
2751 ad
->a
.visibility
= STV_DEFAULT
;
2752 else if (!strcmp (tokc
.cstr
->data
, "hidden"))
2753 ad
->a
.visibility
= STV_HIDDEN
;
2754 else if (!strcmp (tokc
.cstr
->data
, "internal"))
2755 ad
->a
.visibility
= STV_INTERNAL
;
2756 else if (!strcmp (tokc
.cstr
->data
, "protected"))
2757 ad
->a
.visibility
= STV_PROTECTED
;
2759 expect("visibility(\"default|hidden|internal|protected\")");
2768 if (n
<= 0 || (n
& (n
- 1)) != 0)
2769 tcc_error("alignment must be a positive power of two");
2786 /* currently, no need to handle it because tcc does not
2787 track unused objects */
2791 /* currently, no need to handle it because tcc does not
2792 track unused objects */
2797 ad
->a
.func_call
= FUNC_CDECL
;
2802 ad
->a
.func_call
= FUNC_STDCALL
;
2804 #ifdef TCC_TARGET_I386
2814 ad
->a
.func_call
= FUNC_FASTCALL1
+ n
- 1;
2820 ad
->a
.func_call
= FUNC_FASTCALLW
;
2827 ad
->a
.mode
= VT_LLONG
+ 1;
2830 ad
->a
.mode
= VT_SHORT
+ 1;
2833 ad
->a
.mode
= VT_INT
+ 1;
2836 tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok
, NULL
));
2843 ad
->a
.func_export
= 1;
2846 ad
->a
.func_import
= 1;
2849 if (tcc_state
->warn_unsupported
)
2850 tcc_warning("'%s' attribute ignored", get_tok_str(t
, NULL
));
2851 /* skip parameters */
2853 int parenthesis
= 0;
2857 else if (tok
== ')')
2860 } while (parenthesis
&& tok
!= -1);
2873 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
2874 static void struct_decl(CType
*type
, int u
, int tdef
)
2876 int a
, v
, size
, align
, maxalign
, c
, offset
, flexible
;
2877 int bit_size
, bit_pos
, bsize
, bt
, lbit_pos
, prevbt
;
2878 Sym
*s
, *ss
, *ass
, **ps
;
2882 a
= tok
; /* save decl type */
2887 /* struct already defined ? return it */
2889 expect("struct/union/enum name");
2893 tcc_error("invalid type");
2895 } else if (tok
>= TOK_IDENT
&& !tdef
)
2896 tcc_error("unknown struct/union/enum");
2902 /* we put an undefined size for struct/union */
2903 s
= sym_push(v
| SYM_STRUCT
, &type1
, 0, -1);
2904 s
->r
= 0; /* default alignment is zero as gcc */
2905 /* put struct/union/enum name in type */
2913 tcc_error("struct/union/enum already defined");
2914 /* cannot be empty */
2916 /* non empty enums are not allowed */
2917 if (a
== TOK_ENUM
) {
2921 expect("identifier");
2923 if (ss
&& !local_stack
)
2924 tcc_error("redefinition of enumerator '%s'",
2925 get_tok_str(v
, NULL
));
2931 /* enum symbols have static storage */
2932 ss
= sym_push(v
, &int_type
, VT_CONST
, c
);
2933 ss
->type
.t
|= VT_STATIC
;
2938 /* NOTE: we accept a trailing comma */
2942 s
->c
= type_size(&int_type
, &align
);
2951 while (tok
!= '}') {
2952 parse_btype(&btype
, &ad
);
2955 tcc_error("flexible array member '%s' not at the end of struct",
2956 get_tok_str(v
, NULL
));
2961 type_decl(&type1
, &ad
, &v
, TYPE_DIRECT
| TYPE_ABSTRACT
);
2963 if ((type1
.t
& VT_BTYPE
) != VT_STRUCT
)
2964 expect("identifier");
2966 int v
= btype
.ref
->v
;
2967 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
2968 if (tcc_state
->ms_extensions
== 0)
2969 expect("identifier");
2973 if (type_size(&type1
, &align
) < 0) {
2974 if ((a
== TOK_STRUCT
) && (type1
.t
& VT_ARRAY
) && c
)
2977 tcc_error("field '%s' has incomplete type",
2978 get_tok_str(v
, NULL
));
2980 if ((type1
.t
& VT_BTYPE
) == VT_FUNC
||
2981 (type1
.t
& (VT_TYPEDEF
| VT_STATIC
| VT_EXTERN
| VT_INLINE
)))
2982 tcc_error("invalid type for '%s'",
2983 get_tok_str(v
, NULL
));
2987 bit_size
= expr_const();
2988 /* XXX: handle v = 0 case for messages */
2990 tcc_error("negative width in bit-field '%s'",
2991 get_tok_str(v
, NULL
));
2992 if (v
&& bit_size
== 0)
2993 tcc_error("zero width for bit-field '%s'",
2994 get_tok_str(v
, NULL
));
2996 size
= type_size(&type1
, &align
);
2998 if (align
< ad
.a
.aligned
)
2999 align
= ad
.a
.aligned
;
3000 } else if (ad
.a
.packed
) {
3002 } else if (*tcc_state
->pack_stack_ptr
) {
3003 if (align
> *tcc_state
->pack_stack_ptr
)
3004 align
= *tcc_state
->pack_stack_ptr
;
3007 if (bit_size
>= 0) {
3008 bt
= type1
.t
& VT_BTYPE
;
3015 tcc_error("bitfields must have scalar type");
3017 if (bit_size
> bsize
) {
3018 tcc_error("width of '%s' exceeds its type",
3019 get_tok_str(v
, NULL
));
3020 } else if (bit_size
== bsize
) {
3021 /* no need for bit fields */
3023 } else if (bit_size
== 0) {
3024 /* XXX: what to do if only padding in a
3026 /* zero size: means to pad */
3029 /* we do not have enough room ?
3030 did the type change?
3032 if ((bit_pos
+ bit_size
) > bsize
||
3033 bt
!= prevbt
|| a
== TOK_UNION
)
3036 /* XXX: handle LSB first */
3037 type1
.t
|= VT_BITFIELD
|
3038 (bit_pos
<< VT_STRUCT_SHIFT
) |
3039 (bit_size
<< (VT_STRUCT_SHIFT
+ 6));
3040 bit_pos
+= bit_size
;
3046 if (v
!= 0 || (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
3047 /* add new memory data only if starting
3049 if (lbit_pos
== 0) {
3050 if (a
== TOK_STRUCT
) {
3051 c
= (c
+ align
- 1) & -align
;
3060 if (align
> maxalign
)
3064 printf("add field %s offset=%d",
3065 get_tok_str(v
, NULL
), offset
);
3066 if (type1
.t
& VT_BITFIELD
) {
3067 printf(" pos=%d size=%d",
3068 (type1
.t
>> VT_STRUCT_SHIFT
) & 0x3f,
3069 (type1
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f);
3074 if (v
== 0 && (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
3076 while ((ass
= ass
->next
) != NULL
) {
3077 ss
= sym_push(ass
->v
, &ass
->type
, 0, offset
+ ass
->c
);
3082 ss
= sym_push(v
| SYM_FIELD
, &type1
, 0, offset
);
3086 if (tok
== ';' || tok
== TOK_EOF
)
3093 /* store size and alignment */
3094 s
->c
= (c
+ maxalign
- 1) & -maxalign
;
3100 /* return 1 if basic type is a type size (short, long, long long) */
3101 ST_FUNC
int is_btype_size(int bt
)
3103 return bt
== VT_SHORT
|| bt
== VT_LONG
|| bt
== VT_LLONG
;
3106 /* return 0 if no type declaration. otherwise, return the basic type
3109 static int parse_btype(CType
*type
, AttributeDef
*ad
)
3111 int t
, u
, bt_size
, complete
, type_found
, typespec_found
;
3115 memset(ad
, 0, sizeof(AttributeDef
));
3123 /* currently, we really ignore extension */
3134 tcc_error("too many basic types");
3136 bt_size
= is_btype_size (u
& VT_BTYPE
);
3137 if (u
== VT_INT
|| (!bt_size
&& !(t
& VT_TYPEDEF
)))
3152 if ((t
& VT_BTYPE
) == VT_DOUBLE
) {
3153 #ifndef TCC_TARGET_PE
3154 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3156 } else if ((t
& VT_BTYPE
) == VT_LONG
) {
3157 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3163 #ifdef TCC_TARGET_ARM64
3165 /* GCC's __uint128_t appears in some Linux header files. Make it a
3166 synonym for long double to get the size and alignment right. */
3178 if ((t
& VT_BTYPE
) == VT_LONG
) {
3179 #ifdef TCC_TARGET_PE
3180 t
= (t
& ~VT_BTYPE
) | VT_DOUBLE
;
3182 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3190 struct_decl(&type1
, VT_ENUM
, t
& (VT_TYPEDEF
| VT_EXTERN
));
3193 type
->ref
= type1
.ref
;
3197 struct_decl(&type1
, VT_STRUCT
, t
& (VT_TYPEDEF
| VT_EXTERN
));
3200 /* type modifiers */
3216 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == (VT_DEFSIGN
|VT_UNSIGNED
))
3217 tcc_error("signed and unsigned modifier");
3230 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == VT_DEFSIGN
)
3231 tcc_error("signed and unsigned modifier");
3232 t
|= VT_DEFSIGN
| VT_UNSIGNED
;
3257 /* GNUC attribute */
3258 case TOK_ATTRIBUTE1
:
3259 case TOK_ATTRIBUTE2
:
3260 parse_attribute(ad
);
3263 t
= (t
& ~VT_BTYPE
) | u
;
3271 parse_expr_type(&type1
);
3272 /* remove all storage modifiers except typedef */
3273 type1
.t
&= ~(VT_STORAGE
&~VT_TYPEDEF
);
3279 if (!s
|| !(s
->type
.t
& VT_TYPEDEF
))
3281 t
|= (s
->type
.t
& ~VT_TYPEDEF
);
3282 type
->ref
= s
->type
.ref
;
3284 /* get attributes from typedef */
3285 if (0 == ad
->a
.aligned
)
3286 ad
->a
.aligned
= s
->a
.aligned
;
3287 if (0 == ad
->a
.func_call
)
3288 ad
->a
.func_call
= s
->a
.func_call
;
3289 ad
->a
.packed
|= s
->a
.packed
;
3298 if (tcc_state
->char_is_unsigned
) {
3299 if ((t
& (VT_DEFSIGN
|VT_BTYPE
)) == VT_BYTE
)
3303 /* long is never used as type */
3304 if ((t
& VT_BTYPE
) == VT_LONG
)
3305 #if (!defined TCC_TARGET_X86_64 && !defined TCC_TARGET_ARM64) || \
3306 defined TCC_TARGET_PE
3307 t
= (t
& ~VT_BTYPE
) | VT_INT
;
3309 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3315 /* convert a function parameter type (array to pointer and function to
3316 function pointer) */
3317 static inline void convert_parameter_type(CType
*pt
)
3319 /* remove const and volatile qualifiers (XXX: const could be used
3320 to indicate a const function parameter */
3321 pt
->t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3322 /* array must be transformed to pointer according to ANSI C */
3324 if ((pt
->t
& VT_BTYPE
) == VT_FUNC
) {
3329 ST_FUNC
void parse_asm_str(CString
*astr
)
3332 /* read the string */
3334 expect("string constant");
3336 while (tok
== TOK_STR
) {
3337 /* XXX: add \0 handling too ? */
3338 cstr_cat(astr
, tokc
.cstr
->data
);
3341 cstr_ccat(astr
, '\0');
3344 /* Parse an asm label and return the label
3345 * Don't forget to free the CString in the caller! */
3346 static void asm_label_instr(CString
*astr
)
3349 parse_asm_str(astr
);
3352 printf("asm_alias: \"%s\"\n", (char *)astr
->data
);
3356 static void post_type(CType
*type
, AttributeDef
*ad
)
3358 int n
, l
, t1
, arg_size
, align
;
3359 Sym
**plast
, *s
, *first
;
3364 /* function declaration */
3372 /* read param name and compute offset */
3373 if (l
!= FUNC_OLD
) {
3374 if (!parse_btype(&pt
, &ad1
)) {
3376 tcc_error("invalid type");
3383 if ((pt
.t
& VT_BTYPE
) == VT_VOID
&& tok
== ')')
3385 type_decl(&pt
, &ad1
, &n
, TYPE_DIRECT
| TYPE_ABSTRACT
);
3386 if ((pt
.t
& VT_BTYPE
) == VT_VOID
)
3387 tcc_error("parameter declared as void");
3388 arg_size
+= (type_size(&pt
, &align
) + PTR_SIZE
- 1) / PTR_SIZE
;
3393 expect("identifier");
3397 convert_parameter_type(&pt
);
3398 s
= sym_push(n
| SYM_FIELD
, &pt
, 0, 0);
3404 if (l
== FUNC_NEW
&& tok
== TOK_DOTS
) {
3411 /* if no parameters, then old type prototype */
3415 /* NOTE: const is ignored in returned type as it has a special
3416 meaning in gcc / C++ */
3417 type
->t
&= ~VT_CONSTANT
;
3418 /* some ancient pre-K&R C allows a function to return an array
3419 and the array brackets to be put after the arguments, such
3420 that "int c()[]" means something like "int[] c()" */
3423 skip(']'); /* only handle simple "[]" */
3426 /* we push a anonymous symbol which will contain the function prototype */
3427 ad
->a
.func_args
= arg_size
;
3428 s
= sym_push(SYM_FIELD
, type
, 0, l
);
3433 } else if (tok
== '[') {
3434 /* array definition */
3436 if (tok
== TOK_RESTRICT1
)
3441 if (!local_stack
|| nocode_wanted
)
3442 vpushi(expr_const());
3444 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3447 tcc_error("invalid array size");
3449 if (!is_integer_btype(vtop
->type
.t
& VT_BTYPE
))
3450 tcc_error("size of variable length array should be an integer");
3455 /* parse next post type */
3456 post_type(type
, ad
);
3457 if (type
->t
== VT_FUNC
)
3458 tcc_error("declaration of an array of functions");
3459 t1
|= type
->t
& VT_VLA
;
3462 loc
-= type_size(&int_type
, &align
);
3466 vla_runtime_type_size(type
, &align
);
3468 vset(&int_type
, VT_LOCAL
|VT_LVAL
, loc
);
3475 /* we push an anonymous symbol which will contain the array
3477 s
= sym_push(SYM_FIELD
, type
, 0, n
);
3478 type
->t
= (t1
? VT_VLA
: VT_ARRAY
) | VT_PTR
;
3483 /* Parse a type declaration (except basic type), and return the type
3484 in 'type'. 'td' is a bitmask indicating which kind of type decl is
3485 expected. 'type' should contain the basic type. 'ad' is the
3486 attribute definition of the basic type. It can be modified by
3489 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
)
3492 CType type1
, *type2
;
3493 int qualifiers
, storage
;
3495 while (tok
== '*') {
3503 qualifiers
|= VT_CONSTANT
;
3508 qualifiers
|= VT_VOLATILE
;
3516 type
->t
|= qualifiers
;
3519 /* XXX: clarify attribute handling */
3520 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3521 parse_attribute(ad
);
3523 /* recursive type */
3524 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
3525 type1
.t
= 0; /* XXX: same as int */
3528 /* XXX: this is not correct to modify 'ad' at this point, but
3529 the syntax is not clear */
3530 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3531 parse_attribute(ad
);
3532 type_decl(&type1
, ad
, v
, td
);
3535 /* type identifier */
3536 if (tok
>= TOK_IDENT
&& (td
& TYPE_DIRECT
)) {
3540 if (!(td
& TYPE_ABSTRACT
))
3541 expect("identifier");
3545 storage
= type
->t
& VT_STORAGE
;
3546 type
->t
&= ~VT_STORAGE
;
3547 if (storage
& VT_STATIC
) {
3548 int saved_nocode_wanted
= nocode_wanted
;
3550 post_type(type
, ad
);
3551 nocode_wanted
= saved_nocode_wanted
;
3553 post_type(type
, ad
);
3555 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3556 parse_attribute(ad
);
3560 /* append type at the end of type1 */
3573 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
3574 ST_FUNC
int lvalue_type(int t
)
3579 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
3581 else if (bt
== VT_SHORT
)
3585 if (t
& VT_UNSIGNED
)
3586 r
|= VT_LVAL_UNSIGNED
;
3590 /* indirection with full error checking and bound check */
3591 ST_FUNC
void indir(void)
3593 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
) {
3594 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FUNC
)
3598 if ((vtop
->r
& VT_LVAL
) && !nocode_wanted
)
3600 vtop
->type
= *pointed_type(&vtop
->type
);
3601 /* Arrays and functions are never lvalues */
3602 if (!(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_VLA
)
3603 && (vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
3604 vtop
->r
|= lvalue_type(vtop
->type
.t
);
3605 /* if bound checking, the referenced pointer must be checked */
3606 #ifdef CONFIG_TCC_BCHECK
3607 if (tcc_state
->do_bounds_check
)
3608 vtop
->r
|= VT_MUSTBOUND
;
3613 /* pass a parameter to a function and do type checking and casting */
3614 static void gfunc_param_typed(Sym
*func
, Sym
*arg
)
3619 func_type
= func
->c
;
3620 if (func_type
== FUNC_OLD
||
3621 (func_type
== FUNC_ELLIPSIS
&& arg
== NULL
)) {
3622 /* default casting : only need to convert float to double */
3623 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
) {
3626 } else if (vtop
->type
.t
& VT_BITFIELD
) {
3627 type
.t
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
3630 } else if (arg
== NULL
) {
3631 tcc_error("too many arguments to function");
3634 type
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
3635 gen_assign_cast(&type
);
3639 /* parse an expression of the form '(type)' or '(expr)' and return its
3641 static void parse_expr_type(CType
*type
)
3647 if (parse_btype(type
, &ad
)) {
3648 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3655 static void parse_type(CType
*type
)
3660 if (!parse_btype(type
, &ad
)) {
3663 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3666 static void vpush_tokc(int t
)
3671 vsetc(&type
, VT_CONST
, &tokc
);
3674 ST_FUNC
void unary(void)
3676 int n
, t
, align
, size
, r
, sizeof_caller
;
3680 static int in_sizeof
= 0;
3682 sizeof_caller
= in_sizeof
;
3684 /* XXX: GCC 2.95.3 does not generate a table although it should be
3698 vpush_tokc(VT_INT
| VT_UNSIGNED
);
3702 vpush_tokc(VT_LLONG
);
3706 vpush_tokc(VT_LLONG
| VT_UNSIGNED
);
3710 vpush_tokc(VT_FLOAT
);
3714 vpush_tokc(VT_DOUBLE
);
3718 vpush_tokc(VT_LDOUBLE
);
3721 case TOK___FUNCTION__
:
3723 goto tok_identifier
;
3729 /* special function name identifier */
3730 len
= strlen(funcname
) + 1;
3731 /* generate char[len] type */
3736 vpush_ref(&type
, data_section
, data_section
->data_offset
, len
);
3737 ptr
= section_ptr_add(data_section
, len
);
3738 memcpy(ptr
, funcname
, len
);
3743 #ifdef TCC_TARGET_PE
3744 t
= VT_SHORT
| VT_UNSIGNED
;
3750 /* string parsing */
3753 if (tcc_state
->warn_write_strings
)
3758 memset(&ad
, 0, sizeof(AttributeDef
));
3759 decl_initializer_alloc(&type
, &ad
, VT_CONST
, 2, 0, NULL
, 0);
3764 if (parse_btype(&type
, &ad
)) {
3765 type_decl(&type
, &ad
, &n
, TYPE_ABSTRACT
);
3767 /* check ISOC99 compound literal */
3769 /* data is allocated locally by default */
3774 /* all except arrays are lvalues */
3775 if (!(type
.t
& VT_ARRAY
))
3776 r
|= lvalue_type(type
.t
);
3777 memset(&ad
, 0, sizeof(AttributeDef
));
3778 decl_initializer_alloc(&type
, &ad
, r
, 1, 0, NULL
, 0);
3780 if (sizeof_caller
) {
3787 } else if (tok
== '{') {
3790 tcc_error("statement expression in global scope"); */
3791 /* this check breaks compilation of the linux 2.4.26 with the meesage:
3792 linux/include/net/tcp.h:945: error: statement expression in global scope */
3794 /* save all registers */
3796 /* statement expression : we do not accept break/continue
3797 inside as GCC does */
3798 block(NULL
, NULL
, NULL
, NULL
, 0, 1);
3813 /* functions names must be treated as function pointers,
3814 except for unary '&' and sizeof. Since we consider that
3815 functions are not lvalues, we only have to handle it
3816 there and in function calls. */
3817 /* arrays can also be used although they are not lvalues */
3818 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
&&
3819 !(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_LLOCAL
))
3821 mk_pointer(&vtop
->type
);
3827 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3829 boolean
.t
= VT_BOOL
;
3831 vtop
->c
.i
= !vtop
->c
.i
;
3832 } else if ((vtop
->r
& VT_VALMASK
) == VT_CMP
)
3833 vtop
->c
.i
= vtop
->c
.i
^ 1;
3834 else if (!nocode_wanted
) {
3836 vseti(VT_JMP
, gvtst(1, 0));
3850 if ((vtop
->type
.t
& VT_BTYPE
) == VT_PTR
)
3851 tcc_error("pointer not accepted for unary plus");
3852 /* In order to force cast, we add zero, except for floating point
3853 where we really need an noop (otherwise -0.0 will be transformed
3855 if (!is_float(vtop
->type
.t
)) {
3866 unary_type(&type
); // Perform a in_sizeof = 0;
3867 size
= type_size(&type
, &align
);
3868 if (t
== TOK_SIZEOF
) {
3869 if (!(type
.t
& VT_VLA
)) {
3871 tcc_error("sizeof applied to an incomplete type");
3874 vla_runtime_type_size(&type
, &align
);
3879 vtop
->type
.t
|= VT_UNSIGNED
;
3882 case TOK_builtin_types_compatible_p
:
3891 type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3892 type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3893 vpushi(is_compatible_types(&type1
, &type2
));
3896 case TOK_builtin_constant_p
:
3898 int saved_nocode_wanted
, res
;
3901 saved_nocode_wanted
= nocode_wanted
;
3904 res
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
3906 nocode_wanted
= saved_nocode_wanted
;
3911 case TOK_builtin_frame_address
:
3912 case TOK_builtin_return_address
:
3919 if (tok
!= TOK_CINT
|| tokc
.i
< 0) {
3920 tcc_error("%s only takes positive integers",
3921 tok1
== TOK_builtin_return_address
?
3922 "__builtin_return_address" :
3923 "__builtin_frame_address");
3930 vset(&type
, VT_LOCAL
, 0); /* local frame */
3932 mk_pointer(&vtop
->type
);
3933 indir(); /* -> parent frame */
3935 if (tok1
== TOK_builtin_return_address
) {
3936 // assume return address is just above frame pointer on stack
3939 mk_pointer(&vtop
->type
);
3944 #ifdef TCC_TARGET_X86_64
3945 #ifdef TCC_TARGET_PE
3946 case TOK_builtin_va_start
:
3954 if ((vtop
->r
& VT_VALMASK
) != VT_LOCAL
)
3955 tcc_error("__builtin_va_start expects a local variable");
3956 vtop
->r
&= ~(VT_LVAL
| VT_REF
);
3957 vtop
->type
= char_pointer_type
;
3962 case TOK_builtin_va_arg_types
:
3969 vpushi(classify_x86_64_va_arg(&type
));
3975 #ifdef TCC_TARGET_ARM64
3976 case TOK___va_start
: {
3978 tcc_error("statement in global scope");
3988 vtop
->type
.t
= VT_VOID
;
3991 case TOK___va_arg
: {
3993 tcc_error("statement in global scope");
4006 case TOK___arm64_clear_cache
: {
4015 vtop
->type
.t
= VT_VOID
;
4019 /* pre operations */
4030 t
= vtop
->type
.t
& VT_BTYPE
;
4032 /* In IEEE negate(x) isn't subtract(0,x), but rather
4037 else if (t
== VT_DOUBLE
)
4048 goto tok_identifier
;
4050 /* allow to take the address of a label */
4051 if (tok
< TOK_UIDENT
)
4052 expect("label identifier");
4053 s
= label_find(tok
);
4055 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
4057 if (s
->r
== LABEL_DECLARED
)
4058 s
->r
= LABEL_FORWARD
;
4061 s
->type
.t
= VT_VOID
;
4062 mk_pointer(&s
->type
);
4063 s
->type
.t
|= VT_STATIC
;
4065 vpushsym(&s
->type
, s
);
4069 // special qnan , snan and infinity values
4071 vpush64(VT_DOUBLE
, 0x7ff8000000000000ULL
);
4075 vpush64(VT_DOUBLE
, 0x7ff0000000000001ULL
);
4079 vpush64(VT_DOUBLE
, 0x7ff0000000000000ULL
);
4088 expect("identifier");
4091 const char *name
= get_tok_str(t
, NULL
);
4093 tcc_error("'%s' undeclared", name
);
4094 /* for simple function calls, we tolerate undeclared
4095 external reference to int() function */
4096 if (tcc_state
->warn_implicit_function_declaration
4097 #ifdef TCC_TARGET_PE
4098 /* people must be warned about using undeclared WINAPI functions
4099 (which usually start with uppercase letter) */
4100 || (name
[0] >= 'A' && name
[0] <= 'Z')
4103 tcc_warning("implicit declaration of function '%s'", name
);
4104 s
= external_global_sym(t
, &func_old_type
, 0);
4106 if ((s
->type
.t
& (VT_STATIC
| VT_INLINE
| VT_BTYPE
)) ==
4107 (VT_STATIC
| VT_INLINE
| VT_FUNC
)) {
4108 /* if referencing an inline function, then we generate a
4109 symbol to it if not already done. It will have the
4110 effect to generate code for it at the end of the
4111 compilation unit. Inline function as always
4112 generated in the text section. */
4114 put_extern_sym(s
, text_section
, 0, 0);
4115 r
= VT_SYM
| VT_CONST
;
4119 vset(&s
->type
, r
, s
->c
);
4120 /* if forward reference, we must point to s */
4121 if (vtop
->r
& VT_SYM
) {
4123 vtop
->c
.ptr_offset
= 0;
4128 /* post operations */
4130 if (tok
== TOK_INC
|| tok
== TOK_DEC
) {
4133 } else if (tok
== '.' || tok
== TOK_ARROW
) {
4136 if (tok
== TOK_ARROW
)
4138 qualifiers
= vtop
->type
.t
& (VT_CONSTANT
| VT_VOLATILE
);
4142 /* expect pointer on structure */
4143 if ((vtop
->type
.t
& VT_BTYPE
) != VT_STRUCT
)
4144 expect("struct or union");
4148 while ((s
= s
->next
) != NULL
) {
4153 tcc_error("field not found: %s", get_tok_str(tok
& ~SYM_FIELD
, NULL
));
4154 /* add field offset to pointer */
4155 vtop
->type
= char_pointer_type
; /* change type to 'char *' */
4158 /* change type to field type, and set to lvalue */
4159 vtop
->type
= s
->type
;
4160 vtop
->type
.t
|= qualifiers
;
4161 /* an array is never an lvalue */
4162 if (!(vtop
->type
.t
& VT_ARRAY
)) {
4163 vtop
->r
|= lvalue_type(vtop
->type
.t
);
4164 #ifdef CONFIG_TCC_BCHECK
4165 /* if bound checking, the referenced pointer must be checked */
4166 if (tcc_state
->do_bounds_check
)
4167 vtop
->r
|= VT_MUSTBOUND
;
4171 } else if (tok
== '[') {
4177 } else if (tok
== '(') {
4180 int nb_args
, ret_nregs
, ret_align
, regsize
, variadic
;
4183 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
4184 /* pointer test (no array accepted) */
4185 if ((vtop
->type
.t
& (VT_BTYPE
| VT_ARRAY
)) == VT_PTR
) {
4186 vtop
->type
= *pointed_type(&vtop
->type
);
4187 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
)
4191 expect("function pointer");
4194 vtop
->r
&= ~VT_LVAL
; /* no lvalue */
4196 /* get return type */
4199 sa
= s
->next
; /* first parameter */
4202 /* compute first implicit argument if a structure is returned */
4203 if ((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
4204 variadic
= (s
->c
== FUNC_ELLIPSIS
);
4205 ret_nregs
= gfunc_sret(&s
->type
, variadic
, &ret
.type
,
4206 &ret_align
, ®size
);
4208 /* get some space for the returned structure */
4209 size
= type_size(&s
->type
, &align
);
4210 #ifdef TCC_TARGET_ARM64
4211 /* On arm64, a small struct is return in registers.
4212 It is much easier to write it to memory if we know
4213 that we are allowed to write some extra bytes, so
4214 round the allocated space up to a power of 2: */
4216 while (size
& (size
- 1))
4217 size
= (size
| (size
- 1)) + 1;
4219 loc
= (loc
- size
) & -align
;
4221 ret
.r
= VT_LOCAL
| VT_LVAL
;
4222 /* pass it as 'int' to avoid structure arg passing
4224 vseti(VT_LOCAL
, loc
);
4234 /* return in register */
4235 if (is_float(ret
.type
.t
)) {
4236 ret
.r
= reg_fret(ret
.type
.t
);
4237 #ifdef TCC_TARGET_X86_64
4238 if ((ret
.type
.t
& VT_BTYPE
) == VT_QFLOAT
)
4242 #ifndef TCC_TARGET_ARM64
4243 #ifdef TCC_TARGET_X86_64
4244 if ((ret
.type
.t
& VT_BTYPE
) == VT_QLONG
)
4246 if ((ret
.type
.t
& VT_BTYPE
) == VT_LLONG
)
4257 gfunc_param_typed(s
, sa
);
4267 tcc_error("too few arguments to function");
4269 if (!nocode_wanted
) {
4270 gfunc_call(nb_args
);
4272 vtop
-= (nb_args
+ 1);
4276 for (r
= ret
.r
+ ret_nregs
+ !ret_nregs
; r
-- > ret
.r
;) {
4277 vsetc(&ret
.type
, r
, &ret
.c
);
4278 vtop
->r2
= ret
.r2
; /* Loop only happens when r2 is VT_CONST */
4281 /* handle packed struct return */
4282 if (((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) && ret_nregs
) {
4285 size
= type_size(&s
->type
, &align
);
4286 /* We're writing whole regs often, make sure there's enough
4287 space. Assume register size is power of 2. */
4288 if (regsize
> align
)
4290 loc
= (loc
- size
) & -align
;
4294 vset(&ret
.type
, VT_LOCAL
| VT_LVAL
, addr
+ offset
);
4298 if (--ret_nregs
== 0)
4302 vset(&s
->type
, VT_LOCAL
| VT_LVAL
, addr
);
4310 ST_FUNC
void expr_prod(void)
4315 while (tok
== '*' || tok
== '/' || tok
== '%') {
4323 ST_FUNC
void expr_sum(void)
4328 while (tok
== '+' || tok
== '-') {
4336 static void expr_shift(void)
4341 while (tok
== TOK_SHL
|| tok
== TOK_SAR
) {
4349 static void expr_cmp(void)
4354 while ((tok
>= TOK_ULE
&& tok
<= TOK_GT
) ||
4355 tok
== TOK_ULT
|| tok
== TOK_UGE
) {
4363 static void expr_cmpeq(void)
4368 while (tok
== TOK_EQ
|| tok
== TOK_NE
) {
4376 static void expr_and(void)
4379 while (tok
== '&') {
4386 static void expr_xor(void)
4389 while (tok
== '^') {
4396 static void expr_or(void)
4399 while (tok
== '|') {
4406 /* XXX: fix this mess */
4407 static void expr_land_const(void)
4410 while (tok
== TOK_LAND
) {
4417 /* XXX: fix this mess */
4418 static void expr_lor_const(void)
4421 while (tok
== TOK_LOR
) {
4428 /* only used if non constant */
4429 static void expr_land(void)
4434 if (tok
== TOK_LAND
) {
4439 if (tok
!= TOK_LAND
) {
4449 static void expr_lor(void)
4454 if (tok
== TOK_LOR
) {
4459 if (tok
!= TOK_LOR
) {
4469 /* XXX: better constant handling */
4470 static void expr_cond(void)
4472 int tt
, u
, r1
, r2
, rc
, t1
, t2
, bt1
, bt2
;
4474 CType type
, type1
, type2
;
4481 boolean
.t
= VT_BOOL
;
4487 if (tok
!= ':' || !gnu_ext
) {
4502 if (vtop
!= vstack
) {
4503 /* needed to avoid having different registers saved in
4505 if (is_float(vtop
->type
.t
)) {
4507 #ifdef TCC_TARGET_X86_64
4508 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4518 if (tok
== ':' && gnu_ext
) {
4526 sv
= *vtop
; /* save value to handle it later */
4527 vtop
--; /* no vpop so that FP stack is not flushed */
4535 bt1
= t1
& VT_BTYPE
;
4537 bt2
= t2
& VT_BTYPE
;
4538 /* cast operands to correct type according to ISOC rules */
4539 if (is_float(bt1
) || is_float(bt2
)) {
4540 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
4541 type
.t
= VT_LDOUBLE
;
4542 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
4547 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
4548 /* cast to biggest op */
4550 /* convert to unsigned if it does not fit in a long long */
4551 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
4552 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
4553 type
.t
|= VT_UNSIGNED
;
4554 } else if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
4555 /* If one is a null ptr constant the result type
4557 if (is_null_pointer (vtop
))
4559 else if (is_null_pointer (&sv
))
4561 /* XXX: test pointer compatibility, C99 has more elaborate
4565 } else if (bt1
== VT_FUNC
|| bt2
== VT_FUNC
) {
4566 /* XXX: test function pointer compatibility */
4567 type
= bt1
== VT_FUNC
? type1
: type2
;
4568 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
4569 /* XXX: test structure compatibility */
4570 type
= bt1
== VT_STRUCT
? type1
: type2
;
4571 } else if (bt1
== VT_VOID
|| bt2
== VT_VOID
) {
4572 /* NOTE: as an extension, we accept void on only one side */
4575 /* integer operations */
4577 /* convert to unsigned if it does not fit in an integer */
4578 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
4579 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
4580 type
.t
|= VT_UNSIGNED
;
4583 /* now we convert second operand */
4585 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4588 if (is_float(type
.t
)) {
4590 #ifdef TCC_TARGET_X86_64
4591 if ((type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4595 } else if ((type
.t
& VT_BTYPE
) == VT_LLONG
) {
4596 /* for long longs, we use fixed registers to avoid having
4597 to handle a complicated move */
4602 /* this is horrible, but we must also convert first
4606 /* put again first value and cast it */
4609 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4612 move_reg(r2
, r1
, type
.t
);
4619 static void expr_eq(void)
4625 (tok
>= TOK_A_MOD
&& tok
<= TOK_A_DIV
) ||
4626 tok
== TOK_A_XOR
|| tok
== TOK_A_OR
||
4627 tok
== TOK_A_SHL
|| tok
== TOK_A_SAR
) {
4642 ST_FUNC
void gexpr(void)
4653 /* parse an expression and return its type without any side effect. */
4654 static void expr_type(CType
*type
)
4656 int saved_nocode_wanted
;
4658 saved_nocode_wanted
= nocode_wanted
;
4663 nocode_wanted
= saved_nocode_wanted
;
4666 /* parse a unary expression and return its type without any side
4668 static void unary_type(CType
*type
)
4680 /* parse a constant expression and return value in vtop. */
4681 static void expr_const1(void)
4690 /* parse an integer constant and return its value. */
4691 ST_FUNC
int expr_const(void)
4695 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
4696 expect("constant expression");
4702 /* return the label token if current token is a label, otherwise
4704 static int is_label(void)
4708 /* fast test first */
4709 if (tok
< TOK_UIDENT
)
4711 /* no need to save tokc because tok is an identifier */
4718 unget_tok(last_tok
);
4723 static void label_or_decl(int l
)
4727 /* fast test first */
4728 if (tok
>= TOK_UIDENT
)
4730 /* no need to save tokc because tok is an identifier */
4734 unget_tok(last_tok
);
4737 unget_tok(last_tok
);
4742 static void block(int *bsym
, int *csym
, int *case_sym
, int *def_sym
,
4743 int case_reg
, int is_expr
)
4746 Sym
*s
, *frame_bottom
;
4748 /* generate line number info */
4749 if (tcc_state
->do_debug
&&
4750 (last_line_num
!= file
->line_num
|| last_ind
!= ind
)) {
4751 put_stabn(N_SLINE
, 0, file
->line_num
, ind
- func_ind
);
4753 last_line_num
= file
->line_num
;
4757 /* default return value is (void) */
4759 vtop
->type
.t
= VT_VOID
;
4762 if (tok
== TOK_IF
) {
4769 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4771 if (c
== TOK_ELSE
) {
4775 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4776 gsym(d
); /* patch else jmp */
4779 } else if (tok
== TOK_WHILE
) {
4787 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4791 } else if (tok
== '{') {
4793 int block_vla_sp_loc
, *saved_vla_sp_loc
, saved_vla_flags
;
4796 /* record local declaration stack position */
4798 frame_bottom
= sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
4799 frame_bottom
->next
= scope_stack_bottom
;
4800 scope_stack_bottom
= frame_bottom
;
4801 llabel
= local_label_stack
;
4803 /* save VLA state */
4804 block_vla_sp_loc
= *(saved_vla_sp_loc
= vla_sp_loc
);
4805 if (saved_vla_sp_loc
!= &vla_sp_root_loc
)
4806 vla_sp_loc
= &block_vla_sp_loc
;
4808 saved_vla_flags
= vla_flags
;
4809 vla_flags
|= VLA_NEED_NEW_FRAME
;
4811 /* handle local labels declarations */
4812 if (tok
== TOK_LABEL
) {
4815 if (tok
< TOK_UIDENT
)
4816 expect("label identifier");
4817 label_push(&local_label_stack
, tok
, LABEL_DECLARED
);
4827 while (tok
!= '}') {
4828 label_or_decl(VT_LOCAL
);
4832 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
4835 /* pop locally defined labels */
4836 label_pop(&local_label_stack
, llabel
);
4838 /* XXX: this solution makes only valgrind happy...
4839 triggered by gcc.c-torture/execute/20000917-1.c */
4841 switch(vtop
->type
.t
& VT_BTYPE
) {
4843 /* this breaks a compilation of the linux kernel v2.4.26 */
4844 /* pmd_t *new = ({ __asm__ __volatile__("ud2\n") ; ((pmd_t *)1); }); */
4845 /* Look a commit a80acab: Display error on statement expressions with complex return type */
4846 /* A pointer is not a complex return type */
4850 for(p
=vtop
->type
.ref
;p
;p
=p
->prev
)
4852 tcc_error("unsupported expression type");
4855 /* pop locally defined symbols */
4856 scope_stack_bottom
= scope_stack_bottom
->next
;
4857 sym_pop(&local_stack
, s
);
4859 /* Pop VLA frames and restore stack pointer if required */
4860 if (saved_vla_sp_loc
!= &vla_sp_root_loc
)
4861 *saved_vla_sp_loc
= block_vla_sp_loc
;
4862 if (vla_sp_loc
!= (saved_vla_sp_loc
== &vla_sp_root_loc
? &vla_sp_root_loc
: &block_vla_sp_loc
)) {
4863 vla_sp_loc
= saved_vla_sp_loc
;
4864 gen_vla_sp_restore(*vla_sp_loc
);
4866 vla_flags
= (vla_flags
& ~VLA_SCOPE_FLAGS
) | (saved_vla_flags
& VLA_SCOPE_FLAGS
);
4869 } else if (tok
== TOK_RETURN
) {
4873 gen_assign_cast(&func_vt
);
4874 #ifdef TCC_TARGET_ARM64
4875 // Perhaps it would be better to use this for all backends:
4878 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
4879 CType type
, ret_type
;
4880 int ret_align
, ret_nregs
, regsize
;
4881 ret_nregs
= gfunc_sret(&func_vt
, func_var
, &ret_type
,
4882 &ret_align
, ®size
);
4883 if (0 == ret_nregs
) {
4884 /* if returning structure, must copy it to implicit
4885 first pointer arg location */
4888 vset(&type
, VT_LOCAL
| VT_LVAL
, func_vc
);
4891 /* copy structure value to pointer */
4894 /* returning structure packed into registers */
4895 int r
, size
, addr
, align
;
4896 size
= type_size(&func_vt
,&align
);
4897 if ((vtop
->r
!= (VT_LOCAL
| VT_LVAL
) || (vtop
->c
.i
& (ret_align
-1)))
4898 && (align
& (ret_align
-1))) {
4899 loc
= (loc
- size
) & -align
;
4902 vset(&type
, VT_LOCAL
| VT_LVAL
, addr
);
4905 vset(&ret_type
, VT_LOCAL
| VT_LVAL
, addr
);
4907 vtop
->type
= ret_type
;
4908 if (is_float(ret_type
.t
))
4909 r
= rc_fret(ret_type
.t
);
4915 if (--ret_nregs
== 0)
4917 /* We assume that when a structure is returned in multiple
4918 registers, their classes are consecutive values of the
4921 vtop
->c
.i
+= regsize
;
4922 vtop
->r
= VT_LOCAL
| VT_LVAL
;
4925 } else if (is_float(func_vt
.t
)) {
4926 gv(rc_fret(func_vt
.t
));
4931 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
4934 rsym
= gjmp(rsym
); /* jmp */
4935 } else if (tok
== TOK_BREAK
) {
4938 tcc_error("cannot break");
4939 *bsym
= gjmp(*bsym
);
4942 } else if (tok
== TOK_CONTINUE
) {
4945 tcc_error("cannot continue");
4946 *csym
= gjmp(*csym
);
4949 } else if (tok
== TOK_FOR
) {
4954 frame_bottom
= sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
4955 frame_bottom
->next
= scope_stack_bottom
;
4956 scope_stack_bottom
= frame_bottom
;
4958 /* c99 for-loop init decl? */
4959 if (!decl0(VT_LOCAL
, 1)) {
4960 /* no, regular for-loop init expr */
4984 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4988 scope_stack_bottom
= scope_stack_bottom
->next
;
4989 sym_pop(&local_stack
, s
);
4991 if (tok
== TOK_DO
) {
4996 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
5007 if (tok
== TOK_SWITCH
) {
5011 /* XXX: other types than integer */
5012 case_reg
= gv(RC_INT
);
5016 b
= gjmp(0); /* jump to first case */
5018 block(&a
, csym
, &b
, &c
, case_reg
, 0);
5019 /* if no default, jmp after switch */
5027 if (tok
== TOK_CASE
) {
5034 if (gnu_ext
&& tok
== TOK_DOTS
) {
5038 tcc_warning("empty case range");
5040 /* since a case is like a label, we must skip it with a jmp */
5048 *case_sym
= gtst(1, 0);
5051 *case_sym
= gtst(1, 0);
5055 *case_sym
= gtst(1, *case_sym
);
5057 case_reg
= gv(RC_INT
);
5062 goto block_after_label
;
5064 if (tok
== TOK_DEFAULT
) {
5070 tcc_error("too many 'default'");
5073 goto block_after_label
;
5075 if (tok
== TOK_GOTO
) {
5077 if (tok
== '*' && gnu_ext
) {
5081 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
)
5084 } else if (tok
>= TOK_UIDENT
) {
5085 s
= label_find(tok
);
5086 /* put forward definition if needed */
5088 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
5090 if (s
->r
== LABEL_DECLARED
)
5091 s
->r
= LABEL_FORWARD
;
5093 /* label already defined */
5094 if (vla_flags
& VLA_IN_SCOPE
) {
5095 /* If VLAs are in use, save the current stack pointer and
5096 reset the stack pointer to what it was at function entry
5097 (label will restore stack pointer in inner scopes) */
5099 gen_vla_sp_restore(vla_sp_root_loc
);
5101 if (s
->r
& LABEL_FORWARD
)
5102 s
->jnext
= gjmp(s
->jnext
);
5104 gjmp_addr(s
->jnext
);
5107 expect("label identifier");
5110 } else if (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
) {
5116 if (vla_flags
& VLA_IN_SCOPE
) {
5117 /* save/restore stack pointer across label
5118 this is a no-op when combined with the load immediately
5119 after the label unless we arrive via goto */
5124 if (s
->r
== LABEL_DEFINED
)
5125 tcc_error("duplicate label '%s'", get_tok_str(s
->v
, NULL
));
5127 s
->r
= LABEL_DEFINED
;
5129 s
= label_push(&global_label_stack
, b
, LABEL_DEFINED
);
5132 if (vla_flags
& VLA_IN_SCOPE
) {
5133 gen_vla_sp_restore(*vla_sp_loc
);
5134 vla_flags
|= VLA_NEED_NEW_FRAME
;
5136 /* we accept this, but it is a mistake */
5139 tcc_warning("deprecated use of label at end of compound statement");
5143 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
5146 /* expression case */
5161 /* t is the array or struct type. c is the array or struct
5162 address. cur_index/cur_field is the pointer to the current
5163 value. 'size_only' is true if only size info is needed (only used
5165 static void decl_designator(CType
*type
, Section
*sec
, unsigned long c
,
5166 int *cur_index
, Sym
**cur_field
,
5170 int notfirst
, index
, index_last
, align
, l
, nb_elems
, elem_size
;
5176 if (gnu_ext
&& (l
= is_label()) != 0)
5178 while (tok
== '[' || tok
== '.') {
5180 if (!(type
->t
& VT_ARRAY
))
5181 expect("array type");
5184 index
= expr_const();
5185 if (index
< 0 || (s
->c
>= 0 && index
>= s
->c
))
5186 expect("invalid index");
5187 if (tok
== TOK_DOTS
&& gnu_ext
) {
5189 index_last
= expr_const();
5190 if (index_last
< 0 ||
5191 (s
->c
>= 0 && index_last
>= s
->c
) ||
5193 expect("invalid index");
5199 *cur_index
= index_last
;
5200 type
= pointed_type(type
);
5201 elem_size
= type_size(type
, &align
);
5202 c
+= index
* elem_size
;
5203 /* NOTE: we only support ranges for last designator */
5204 nb_elems
= index_last
- index
+ 1;
5205 if (nb_elems
!= 1) {
5214 if ((type
->t
& VT_BTYPE
) != VT_STRUCT
)
5215 expect("struct/union type");
5228 /* XXX: fix this mess by using explicit storage field */
5230 type1
.t
|= (type
->t
& ~VT_TYPE
);
5244 if (type
->t
& VT_ARRAY
) {
5246 type
= pointed_type(type
);
5247 c
+= index
* type_size(type
, &align
);
5251 tcc_error("too many field init");
5252 /* XXX: fix this mess by using explicit storage field */
5254 type1
.t
|= (type
->t
& ~VT_TYPE
);
5259 decl_initializer(type
, sec
, c
, 0, size_only
);
5261 /* XXX: make it more general */
5262 if (!size_only
&& nb_elems
> 1) {
5263 unsigned long c_end
;
5268 tcc_error("range init not supported yet for dynamic storage");
5269 c_end
= c
+ nb_elems
* elem_size
;
5270 if (c_end
> sec
->data_allocated
)
5271 section_realloc(sec
, c_end
);
5272 src
= sec
->data
+ c
;
5274 for(i
= 1; i
< nb_elems
; i
++) {
5276 memcpy(dst
, src
, elem_size
);
5282 #define EXPR_CONST 1
5285 /* store a value or an expression directly in global data or in local array */
5286 static void init_putv(CType
*type
, Section
*sec
, unsigned long c
,
5287 int v
, int expr_type
)
5289 int saved_global_expr
, bt
, bit_pos
, bit_size
;
5291 unsigned long long bit_mask
;
5299 /* compound literals must be allocated globally in this case */
5300 saved_global_expr
= global_expr
;
5303 global_expr
= saved_global_expr
;
5304 /* NOTE: symbols are accepted */
5305 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) != VT_CONST
)
5306 tcc_error("initializer element is not constant");
5314 dtype
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
5317 /* XXX: not portable */
5318 /* XXX: generate error if incorrect relocation */
5319 gen_assign_cast(&dtype
);
5320 bt
= type
->t
& VT_BTYPE
;
5321 /* we'll write at most 16 bytes */
5322 if (c
+ 16 > sec
->data_allocated
) {
5323 section_realloc(sec
, c
+ 16);
5325 ptr
= sec
->data
+ c
;
5326 /* XXX: make code faster ? */
5327 if (!(type
->t
& VT_BITFIELD
)) {
5332 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5333 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
5334 bit_mask
= (1LL << bit_size
) - 1;
5336 if ((vtop
->r
& VT_SYM
) &&
5342 (bt
== VT_INT
&& bit_size
!= 32)))
5343 tcc_error("initializer element is not computable at load time");
5345 /* XXX: when cross-compiling we assume that each type has the
5346 same representation on host and target, which is likely to
5347 be wrong in the case of long double */
5349 vtop
->c
.i
= (vtop
->c
.i
!= 0);
5351 *(char *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5354 *(short *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5357 *(double *)ptr
= vtop
->c
.d
;
5360 *(long double *)ptr
= vtop
->c
.ld
;
5363 *(long long *)ptr
|= (vtop
->c
.ll
& bit_mask
) << bit_pos
;
5366 addr_t val
= (vtop
->c
.ptr_offset
& bit_mask
) << bit_pos
;
5367 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
5368 if (vtop
->r
& VT_SYM
)
5369 greloca(sec
, vtop
->sym
, c
, R_DATA_PTR
, val
);
5371 *(addr_t
*)ptr
|= val
;
5373 if (vtop
->r
& VT_SYM
)
5374 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
5375 *(addr_t
*)ptr
|= val
;
5380 int val
= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5381 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
5382 if (vtop
->r
& VT_SYM
)
5383 greloca(sec
, vtop
->sym
, c
, R_DATA_PTR
, val
);
5387 if (vtop
->r
& VT_SYM
)
5388 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
5396 vset(&dtype
, VT_LOCAL
|VT_LVAL
, c
);
5403 /* put zeros for variable based init */
5404 static void init_putz(CType
*t
, Section
*sec
, unsigned long c
, int size
)
5407 /* nothing to do because globals are already set to zero */
5409 vpush_global_sym(&func_old_type
, TOK_memset
);
5411 #ifdef TCC_TARGET_ARM
5422 /* 't' contains the type and storage info. 'c' is the offset of the
5423 object in section 'sec'. If 'sec' is NULL, it means stack based
5424 allocation. 'first' is true if array '{' must be read (multi
5425 dimension implicit array init handling). 'size_only' is true if
5426 size only evaluation is wanted (only for arrays). */
5427 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
,
5428 int first
, int size_only
)
5430 int index
, array_length
, n
, no_oblock
, nb
, parlevel
, parlevel1
, i
;
5431 int size1
, align1
, expr_type
;
5435 if (type
->t
& VT_VLA
) {
5438 /* save current stack pointer */
5439 if (vla_flags
& VLA_NEED_NEW_FRAME
) {
5441 vla_flags
= VLA_IN_SCOPE
;
5442 vla_sp_loc
= &vla_sp_loc_tmp
;
5445 vla_runtime_type_size(type
, &a
);
5446 gen_vla_alloc(type
, a
);
5447 vset(type
, VT_LOCAL
|VT_LVAL
, c
);
5451 } else if (type
->t
& VT_ARRAY
) {
5455 t1
= pointed_type(type
);
5456 size1
= type_size(t1
, &align1
);
5459 if ((first
&& tok
!= TOK_LSTR
&& tok
!= TOK_STR
) ||
5462 tcc_error("character array initializer must be a literal,"
5463 " optionally enclosed in braces");
5468 /* only parse strings here if correct type (otherwise: handle
5469 them as ((w)char *) expressions */
5470 if ((tok
== TOK_LSTR
&&
5471 #ifdef TCC_TARGET_PE
5472 (t1
->t
& VT_BTYPE
) == VT_SHORT
&& (t1
->t
& VT_UNSIGNED
)
5474 (t1
->t
& VT_BTYPE
) == VT_INT
5476 ) || (tok
== TOK_STR
&& (t1
->t
& VT_BTYPE
) == VT_BYTE
)) {
5477 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5482 /* compute maximum number of chars wanted */
5484 cstr_len
= cstr
->size
;
5486 cstr_len
= cstr
->size
/ sizeof(nwchar_t
);
5489 if (n
>= 0 && nb
> (n
- array_length
))
5490 nb
= n
- array_length
;
5493 tcc_warning("initializer-string for array is too long");
5494 /* in order to go faster for common case (char
5495 string in global variable, we handle it
5497 if (sec
&& tok
== TOK_STR
&& size1
== 1) {
5498 memcpy(sec
->data
+ c
+ array_length
, cstr
->data
, nb
);
5502 ch
= ((unsigned char *)cstr
->data
)[i
];
5504 ch
= ((nwchar_t
*)cstr
->data
)[i
];
5505 init_putv(t1
, sec
, c
+ (array_length
+ i
) * size1
,
5513 /* only add trailing zero if enough storage (no
5514 warning in this case since it is standard) */
5515 if (n
< 0 || array_length
< n
) {
5517 init_putv(t1
, sec
, c
+ (array_length
* size1
), 0, EXPR_VAL
);
5523 while (tok
!= '}') {
5524 decl_designator(type
, sec
, c
, &index
, NULL
, size_only
);
5525 if (n
>= 0 && index
>= n
)
5526 tcc_error("index too large");
5527 /* must put zero in holes (note that doing it that way
5528 ensures that it even works with designators) */
5529 if (!size_only
&& array_length
< index
) {
5530 init_putz(t1
, sec
, c
+ array_length
* size1
,
5531 (index
- array_length
) * size1
);
5534 if (index
> array_length
)
5535 array_length
= index
;
5536 /* special test for multi dimensional arrays (may not
5537 be strictly correct if designators are used at the
5539 if (index
>= n
&& no_oblock
)
5548 /* put zeros at the end */
5549 if (!size_only
&& n
>= 0 && array_length
< n
) {
5550 init_putz(t1
, sec
, c
+ array_length
* size1
,
5551 (n
- array_length
) * size1
);
5553 /* patch type size if needed */
5555 s
->c
= array_length
;
5556 } else if ((type
->t
& VT_BTYPE
) == VT_STRUCT
&&
5557 (sec
|| !first
|| tok
== '{')) {
5559 /* NOTE: the previous test is a specific case for automatic
5560 struct/union init */
5561 /* XXX: union needs only one init */
5568 if (!parse_btype(&type1
, &ad1
))
5570 type_decl(&type1
, &ad1
, &n
, TYPE_ABSTRACT
);
5572 if (!is_assignable_types(type
, &type1
))
5573 tcc_error("invalid type for cast");
5580 if (first
|| tok
== '{') {
5589 while (tok
!= '}') {
5590 decl_designator(type
, sec
, c
, NULL
, &f
, size_only
);
5592 if (!size_only
&& array_length
< index
) {
5593 init_putz(type
, sec
, c
+ array_length
,
5594 index
- array_length
);
5596 index
= index
+ type_size(&f
->type
, &align1
);
5597 if (index
> array_length
)
5598 array_length
= index
;
5600 /* gr: skip fields from same union - ugly. */
5603 int f_size
= type_size(&f
->type
, &align
);
5604 int f_type
= (f
->type
.t
& VT_BTYPE
);
5606 ///printf("index: %2d %08x -- %2d %08x\n", f->c, f->type.t, f->next->c, f->next->type.t);
5607 /* test for same offset */
5608 if (f
->next
->c
!= f
->c
)
5610 if ((f_type
== VT_STRUCT
) && (f_size
== 0)) {
5612 Lets assume a structure of size 0 can't be a member of the union.
5613 This allow to compile the following code from a linux kernel v2.4.26
5614 typedef struct { } rwlock_t;
5620 struct fs_struct init_fs = { { (1) }, (rwlock_t) {}, 0022, };
5621 tcc-0.9.23 can succesfully compile this version of the kernel.
5622 gcc don't have problems with this code too.
5626 /* if yes, test for bitfield shift */
5627 if ((f
->type
.t
& VT_BITFIELD
) && (f
->next
->type
.t
& VT_BITFIELD
)) {
5628 int bit_pos_1
= (f
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5629 int bit_pos_2
= (f
->next
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5630 //printf("bitfield %d %d\n", bit_pos_1, bit_pos_2);
5631 if (bit_pos_1
!= bit_pos_2
)
5638 if (no_oblock
&& f
== NULL
)
5644 /* put zeros at the end */
5645 if (!size_only
&& array_length
< n
) {
5646 init_putz(type
, sec
, c
+ array_length
,
5651 } else if (tok
== '{') {
5653 decl_initializer(type
, sec
, c
, first
, size_only
);
5655 } else if (size_only
) {
5656 /* just skip expression */
5657 parlevel
= parlevel1
= 0;
5658 while ((parlevel
> 0 || parlevel1
> 0 ||
5659 (tok
!= '}' && tok
!= ',')) && tok
!= -1) {
5662 else if (tok
== ')') {
5663 if (parlevel
== 0 && parlevel1
== 0)
5667 else if (tok
== '{')
5669 else if (tok
== '}') {
5670 if (parlevel
== 0 && parlevel1
== 0)
5677 /* currently, we always use constant expression for globals
5678 (may change for scripting case) */
5679 expr_type
= EXPR_CONST
;
5681 expr_type
= EXPR_ANY
;
5682 init_putv(type
, sec
, c
, 0, expr_type
);
5686 /* parse an initializer for type 't' if 'has_init' is non zero, and
5687 allocate space in local or global data space ('r' is either
5688 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
5689 variable 'v' with an associated name represented by 'asm_label' of
5690 scope 'scope' is declared before initializers are parsed. If 'v' is
5691 zero, then a reference to the new object is put in the value stack.
5692 If 'has_init' is 2, a special parsing is done to handle string
5694 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
,
5695 int has_init
, int v
, char *asm_label
,
5698 int size
, align
, addr
, data_offset
;
5700 ParseState saved_parse_state
= {0};
5701 TokenString init_str
;
5703 Sym
*flexible_array
;
5705 flexible_array
= NULL
;
5706 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
5707 Sym
*field
= type
->ref
->next
;
5710 field
= field
->next
;
5711 if (field
->type
.t
& VT_ARRAY
&& field
->type
.ref
->c
< 0)
5712 flexible_array
= field
;
5716 size
= type_size(type
, &align
);
5717 /* If unknown size, we must evaluate it before
5718 evaluating initializers because
5719 initializers can generate global data too
5720 (e.g. string pointers or ISOC99 compound
5721 literals). It also simplifies local
5722 initializers handling */
5723 tok_str_new(&init_str
);
5724 if (size
< 0 || (flexible_array
&& has_init
)) {
5726 tcc_error("unknown type size");
5727 /* get all init string */
5728 if (has_init
== 2) {
5729 /* only get strings */
5730 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5731 tok_str_add_tok(&init_str
);
5736 while (level
> 0 || (tok
!= ',' && tok
!= ';')) {
5738 tcc_error("unexpected end of file in initializer");
5739 tok_str_add_tok(&init_str
);
5742 else if (tok
== '}') {
5752 tok_str_add(&init_str
, -1);
5753 tok_str_add(&init_str
, 0);
5756 save_parse_state(&saved_parse_state
);
5758 macro_ptr
= init_str
.str
;
5760 decl_initializer(type
, NULL
, 0, 1, 1);
5761 /* prepare second initializer parsing */
5762 macro_ptr
= init_str
.str
;
5765 /* if still unknown size, error */
5766 size
= type_size(type
, &align
);
5768 tcc_error("unknown type size");
5771 size
+= flexible_array
->type
.ref
->c
* pointed_size(&flexible_array
->type
);
5772 /* take into account specified alignment if bigger */
5773 if (ad
->a
.aligned
) {
5774 if (ad
->a
.aligned
> align
)
5775 align
= ad
->a
.aligned
;
5776 } else if (ad
->a
.packed
) {
5779 if ((r
& VT_VALMASK
) == VT_LOCAL
) {
5781 #ifdef CONFIG_TCC_BCHECK
5782 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5786 loc
= (loc
- size
) & -align
;
5788 #ifdef CONFIG_TCC_BCHECK
5789 /* handles bounds */
5790 /* XXX: currently, since we do only one pass, we cannot track
5791 '&' operators, so we add only arrays */
5792 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5794 /* add padding between regions */
5796 /* then add local bound info */
5797 bounds_ptr
= section_ptr_add(lbounds_section
, 2 * sizeof(addr_t
));
5798 bounds_ptr
[0] = addr
;
5799 bounds_ptr
[1] = size
;
5803 /* local variable */
5804 sym_push(v
, type
, r
, addr
);
5806 /* push local reference */
5807 vset(type
, r
, addr
);
5813 if (v
&& scope
== VT_CONST
) {
5814 /* see if the symbol was already defined */
5817 if (!is_compatible_types(&sym
->type
, type
))
5818 tcc_error("incompatible types for redefinition of '%s'",
5819 get_tok_str(v
, NULL
));
5820 if (sym
->type
.t
& VT_EXTERN
) {
5821 /* if the variable is extern, it was not allocated */
5822 sym
->type
.t
&= ~VT_EXTERN
;
5823 /* set array size if it was omitted in extern
5825 if ((sym
->type
.t
& VT_ARRAY
) &&
5826 sym
->type
.ref
->c
< 0 &&
5828 sym
->type
.ref
->c
= type
->ref
->c
;
5830 /* we accept several definitions of the same
5831 global variable. this is tricky, because we
5832 must play with the SHN_COMMON type of the symbol */
5833 /* XXX: should check if the variable was already
5834 initialized. It is incorrect to initialized it
5836 /* no init data, we won't add more to the symbol */
5843 /* allocate symbol in corresponding section */
5848 else if (tcc_state
->nocommon
)
5852 data_offset
= sec
->data_offset
;
5853 data_offset
= (data_offset
+ align
- 1) & -align
;
5855 /* very important to increment global pointer at this time
5856 because initializers themselves can create new initializers */
5857 data_offset
+= size
;
5858 #ifdef CONFIG_TCC_BCHECK
5859 /* add padding if bound check */
5860 if (tcc_state
->do_bounds_check
)
5863 sec
->data_offset
= data_offset
;
5864 /* allocate section space to put the data */
5865 if (sec
->sh_type
!= SHT_NOBITS
&&
5866 data_offset
> sec
->data_allocated
)
5867 section_realloc(sec
, data_offset
);
5868 /* align section if needed */
5869 if (align
> sec
->sh_addralign
)
5870 sec
->sh_addralign
= align
;
5872 addr
= 0; /* avoid warning */
5876 if (scope
!= VT_CONST
|| !sym
) {
5877 sym
= sym_push(v
, type
, r
| VT_SYM
, 0);
5878 sym
->asm_label
= asm_label
;
5880 /* update symbol definition */
5882 put_extern_sym(sym
, sec
, addr
, size
);
5885 /* put a common area */
5886 put_extern_sym(sym
, NULL
, align
, size
);
5887 /* XXX: find a nicer way */
5888 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
5889 esym
->st_shndx
= SHN_COMMON
;
5892 /* push global reference */
5893 sym
= get_sym_ref(type
, sec
, addr
, size
);
5894 vpushsym(type
, sym
);
5896 /* patch symbol weakness */
5897 if (type
->t
& VT_WEAK
)
5899 apply_visibility(sym
, type
);
5900 #ifdef CONFIG_TCC_BCHECK
5901 /* handles bounds now because the symbol must be defined
5902 before for the relocation */
5903 if (tcc_state
->do_bounds_check
) {
5906 greloc(bounds_section
, sym
, bounds_section
->data_offset
, R_DATA_PTR
);
5907 /* then add global bound info */
5908 bounds_ptr
= section_ptr_add(bounds_section
, 2 * sizeof(addr_t
));
5909 bounds_ptr
[0] = 0; /* relocated */
5910 bounds_ptr
[1] = size
;
5914 if (has_init
|| (type
->t
& VT_VLA
)) {
5915 decl_initializer(type
, sec
, addr
, 1, 0);
5916 /* restore parse state if needed */
5918 tok_str_free(init_str
.str
);
5919 restore_parse_state(&saved_parse_state
);
5921 /* patch flexible array member size back to -1, */
5922 /* for possible subsequent similar declarations */
5924 flexible_array
->type
.ref
->c
= -1;
5929 static void put_func_debug(Sym
*sym
)
5934 /* XXX: we put here a dummy type */
5935 snprintf(buf
, sizeof(buf
), "%s:%c1",
5936 funcname
, sym
->type
.t
& VT_STATIC
? 'f' : 'F');
5937 put_stabs_r(buf
, N_FUN
, 0, file
->line_num
, 0,
5938 cur_text_section
, sym
->c
);
5939 /* //gr gdb wants a line at the function */
5940 put_stabn(N_SLINE
, 0, file
->line_num
, 0);
5945 /* parse an old style function declaration list */
5946 /* XXX: check multiple parameter */
5947 static void func_decl_list(Sym
*func_sym
)
5954 /* parse each declaration */
5955 while (tok
!= '{' && tok
!= ';' && tok
!= ',' && tok
!= TOK_EOF
&&
5956 tok
!= TOK_ASM1
&& tok
!= TOK_ASM2
&& tok
!= TOK_ASM3
) {
5957 if (!parse_btype(&btype
, &ad
))
5958 expect("declaration list");
5959 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
5960 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
5962 /* we accept no variable after */
5966 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
5967 /* find parameter in function parameter list */
5970 if ((s
->v
& ~SYM_FIELD
) == v
)
5974 tcc_error("declaration for parameter '%s' but no such parameter",
5975 get_tok_str(v
, NULL
));
5977 /* check that no storage specifier except 'register' was given */
5978 if (type
.t
& VT_STORAGE
)
5979 tcc_error("storage class specified for '%s'", get_tok_str(v
, NULL
));
5980 convert_parameter_type(&type
);
5981 /* we can add the type (NOTE: it could be local to the function) */
5983 /* accept other parameters */
5994 /* parse a function defined by symbol 'sym' and generate its code in
5995 'cur_text_section' */
5996 static void gen_function(Sym
*sym
)
5998 int saved_nocode_wanted
= nocode_wanted
;
6000 ind
= cur_text_section
->data_offset
;
6001 /* NOTE: we patch the symbol size later */
6002 put_extern_sym(sym
, cur_text_section
, ind
, 0);
6003 funcname
= get_tok_str(sym
->v
, NULL
);
6005 /* Initialize VLA state */
6006 vla_sp_loc
= &vla_sp_root_loc
;
6007 vla_flags
= VLA_NEED_NEW_FRAME
;
6008 /* put debug symbol */
6009 if (tcc_state
->do_debug
)
6010 put_func_debug(sym
);
6011 /* push a dummy symbol to enable local sym storage */
6012 sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
6013 gfunc_prolog(&sym
->type
);
6014 #ifdef CONFIG_TCC_BCHECK
6015 if (tcc_state
->do_bounds_check
6016 && !strcmp(get_tok_str(sym
->v
, NULL
), "main")) {
6020 for (i
= 0, sym
= local_stack
; i
< 2; i
++, sym
= sym
->prev
) {
6021 if (sym
->v
& SYM_FIELD
|| sym
->prev
->v
& SYM_FIELD
)
6023 vpush_global_sym(&func_old_type
, TOK___bound_main_arg
);
6024 vset(&sym
->type
, sym
->r
, sym
->c
);
6030 block(NULL
, NULL
, NULL
, NULL
, 0, 0);
6033 cur_text_section
->data_offset
= ind
;
6034 label_pop(&global_label_stack
, NULL
);
6035 /* reset local stack */
6036 scope_stack_bottom
= NULL
;
6037 sym_pop(&local_stack
, NULL
);
6038 /* end of function */
6039 /* patch symbol size */
6040 ((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
].st_size
=
6042 /* patch symbol weakness (this definition overrules any prototype) */
6043 if (sym
->type
.t
& VT_WEAK
)
6045 apply_visibility(sym
, &sym
->type
);
6046 if (tcc_state
->do_debug
) {
6047 put_stabn(N_FUN
, 0, 0, ind
- func_ind
);
6049 /* It's better to crash than to generate wrong code */
6050 cur_text_section
= NULL
;
6051 funcname
= ""; /* for safety */
6052 func_vt
.t
= VT_VOID
; /* for safety */
6053 func_var
= 0; /* for safety */
6054 ind
= 0; /* for safety */
6055 nocode_wanted
= saved_nocode_wanted
;
6058 ST_FUNC
void gen_inline_functions(void)
6061 int *str
, inline_generated
, i
;
6062 struct InlineFunc
*fn
;
6064 /* iterate while inline function are referenced */
6066 inline_generated
= 0;
6067 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
6068 fn
= tcc_state
->inline_fns
[i
];
6070 if (sym
&& sym
->c
) {
6071 /* the function was used: generate its code and
6072 convert it to a normal function */
6073 str
= fn
->token_str
;
6076 pstrcpy(file
->filename
, sizeof file
->filename
, fn
->filename
);
6077 sym
->r
= VT_SYM
| VT_CONST
;
6078 sym
->type
.t
&= ~VT_INLINE
;
6082 cur_text_section
= text_section
;
6084 macro_ptr
= NULL
; /* fail safe */
6086 inline_generated
= 1;
6089 if (!inline_generated
)
6092 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
6093 fn
= tcc_state
->inline_fns
[i
];
6094 str
= fn
->token_str
;
6097 dynarray_reset(&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
);
6100 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
6101 static int decl0(int l
, int is_for_loop_init
)
6109 if (!parse_btype(&btype
, &ad
)) {
6110 if (is_for_loop_init
)
6112 /* skip redundant ';' */
6113 /* XXX: find more elegant solution */
6118 if (l
== VT_CONST
&&
6119 (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
6120 /* global asm block */
6124 /* special test for old K&R protos without explicit int
6125 type. Only accepted when defining global data */
6126 if (l
== VT_LOCAL
|| tok
< TOK_DEFINE
)
6130 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
6131 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
6133 if ((btype
.t
& VT_BTYPE
) == VT_STRUCT
) {
6134 int v
= btype
.ref
->v
;
6135 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) >= SYM_FIRST_ANOM
)
6136 tcc_warning("unnamed struct/union that defines no instances");
6141 while (1) { /* iterate thru each declaration */
6142 char *asm_label
; // associated asm label
6144 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
6148 type_to_str(buf
, sizeof(buf
), t
, get_tok_str(v
, NULL
));
6149 printf("type = '%s'\n", buf
);
6152 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
6153 if ((type
.t
& VT_STATIC
) && (l
== VT_LOCAL
)) {
6154 tcc_error("function without file scope cannot be static");
6156 /* if old style function prototype, we accept a
6159 if (sym
->c
== FUNC_OLD
)
6160 func_decl_list(sym
);
6164 if (gnu_ext
&& (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
6167 asm_label_instr(&astr
);
6168 asm_label
= tcc_strdup(astr
.data
);
6171 /* parse one last attribute list, after asm label */
6172 parse_attribute(&ad
);
6177 #ifdef TCC_TARGET_PE
6178 if (ad
.a
.func_import
)
6179 type
.t
|= VT_IMPORT
;
6180 if (ad
.a
.func_export
)
6181 type
.t
|= VT_EXPORT
;
6183 type
.t
|= ad
.a
.visibility
<< VT_VIS_SHIFT
;
6187 tcc_error("cannot use local functions");
6188 if ((type
.t
& VT_BTYPE
) != VT_FUNC
)
6189 expect("function definition");
6191 /* reject abstract declarators in function definition */
6193 while ((sym
= sym
->next
) != NULL
)
6194 if (!(sym
->v
& ~SYM_FIELD
))
6195 expect("identifier");
6197 /* XXX: cannot do better now: convert extern line to static inline */
6198 if ((type
.t
& (VT_EXTERN
| VT_INLINE
)) == (VT_EXTERN
| VT_INLINE
))
6199 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
6204 if ((sym
->type
.t
& VT_BTYPE
) != VT_FUNC
)
6207 ref
= sym
->type
.ref
;
6208 if (0 == ref
->a
.func_proto
)
6209 tcc_error("redefinition of '%s'", get_tok_str(v
, NULL
));
6211 /* use func_call from prototype if not defined */
6212 if (ref
->a
.func_call
!= FUNC_CDECL
6213 && type
.ref
->a
.func_call
== FUNC_CDECL
)
6214 type
.ref
->a
.func_call
= ref
->a
.func_call
;
6216 /* use export from prototype */
6217 if (ref
->a
.func_export
)
6218 type
.ref
->a
.func_export
= 1;
6220 /* use static from prototype */
6221 if (sym
->type
.t
& VT_STATIC
)
6222 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
6224 /* If the definition has no visibility use the
6225 one from prototype. */
6226 if (! (type
.t
& VT_VIS_MASK
))
6227 type
.t
|= sym
->type
.t
& VT_VIS_MASK
;
6229 if (!is_compatible_types(&sym
->type
, &type
)) {
6231 tcc_error("incompatible types for redefinition of '%s'",
6232 get_tok_str(v
, NULL
));
6234 type
.ref
->a
.func_proto
= 0;
6235 /* if symbol is already defined, then put complete type */
6238 /* put function symbol */
6239 sym
= global_identifier_push(v
, type
.t
, 0);
6240 sym
->type
.ref
= type
.ref
;
6243 /* static inline functions are just recorded as a kind
6244 of macro. Their code will be emitted at the end of
6245 the compilation unit only if they are used */
6246 if ((type
.t
& (VT_INLINE
| VT_STATIC
)) ==
6247 (VT_INLINE
| VT_STATIC
)) {
6248 TokenString func_str
;
6250 struct InlineFunc
*fn
;
6251 const char *filename
;
6253 tok_str_new(&func_str
);
6259 tcc_error("unexpected end of file");
6260 tok_str_add_tok(&func_str
);
6265 } else if (t
== '}') {
6267 if (block_level
== 0)
6271 tok_str_add(&func_str
, -1);
6272 tok_str_add(&func_str
, 0);
6273 filename
= file
? file
->filename
: "";
6274 fn
= tcc_malloc(sizeof *fn
+ strlen(filename
));
6275 strcpy(fn
->filename
, filename
);
6277 fn
->token_str
= func_str
.str
;
6278 dynarray_add((void ***)&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
, fn
);
6281 /* compute text section */
6282 cur_text_section
= ad
.section
;
6283 if (!cur_text_section
)
6284 cur_text_section
= text_section
;
6285 sym
->r
= VT_SYM
| VT_CONST
;
6290 if (btype
.t
& VT_TYPEDEF
) {
6291 /* save typedefed type */
6292 /* XXX: test storage specifiers ? */
6293 sym
= sym_push(v
, &type
, 0, 0);
6295 sym
->type
.t
|= VT_TYPEDEF
;
6298 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
6299 /* external function definition */
6300 /* specific case for func_call attribute */
6301 ad
.a
.func_proto
= 1;
6303 } else if (!(type
.t
& VT_ARRAY
)) {
6304 /* not lvalue if array */
6305 r
|= lvalue_type(type
.t
);
6307 has_init
= (tok
== '=');
6308 if (has_init
&& (type
.t
& VT_VLA
))
6309 tcc_error("Variable length array cannot be initialized");
6310 if ((btype
.t
& VT_EXTERN
) || ((type
.t
& VT_BTYPE
) == VT_FUNC
) ||
6311 ((type
.t
& VT_ARRAY
) && (type
.t
& VT_STATIC
) &&
6312 !has_init
&& l
== VT_CONST
&& type
.ref
->c
< 0)) {
6313 /* external variable or function */
6314 /* NOTE: as GCC, uninitialized global static
6315 arrays of null size are considered as
6317 sym
= external_sym(v
, &type
, r
, asm_label
);
6319 if (ad
.alias_target
) {
6324 alias_target
= sym_find(ad
.alias_target
);
6325 if (!alias_target
|| !alias_target
->c
)
6326 tcc_error("unsupported forward __alias__ attribute");
6327 esym
= &((Elf32_Sym
*)symtab_section
->data
)[alias_target
->c
];
6328 tsec
.sh_num
= esym
->st_shndx
;
6329 put_extern_sym2(sym
, &tsec
, esym
->st_value
, esym
->st_size
, 0);
6332 type
.t
|= (btype
.t
& VT_STATIC
); /* Retain "static". */
6333 if (type
.t
& VT_STATIC
)
6339 decl_initializer_alloc(&type
, &ad
, r
, has_init
, v
, asm_label
, l
);
6343 if (is_for_loop_init
)
6356 ST_FUNC
void decl(int l
)