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 vlas_in_scope
; /* number of VLAs that are currently in scope */
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 */
62 ST_DATA SValue __vstack
[1+VSTACK_SIZE
], *vtop
, *pvtop
;
64 ST_DATA
int const_wanted
; /* true if constant wanted */
65 ST_DATA
int nocode_wanted
; /* true if no code generation wanted for an expression */
66 ST_DATA
int global_expr
; /* true if compound literals must be allocated globally (used during initializers parsing */
67 ST_DATA CType func_vt
; /* current function return type (used by return instruction) */
68 ST_DATA
int func_var
; /* true if current function is variadic (used by return instruction) */
70 ST_DATA
int last_line_num
, last_ind
, func_ind
; /* debug last line number and pc */
71 ST_DATA
const char *funcname
;
73 ST_DATA CType char_pointer_type
, func_old_type
, int_type
, size_type
;
75 /* ------------------------------------------------------------------------- */
76 static void gen_cast(CType
*type
);
77 static inline CType
*pointed_type(CType
*type
);
78 static int is_compatible_types(CType
*type1
, CType
*type2
);
79 static int parse_btype(CType
*type
, AttributeDef
*ad
);
80 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
);
81 static void parse_expr_type(CType
*type
);
82 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
, int first
, int size_only
);
83 static void block(int *bsym
, int *csym
, int *case_sym
, int *def_sym
, int case_reg
, int is_expr
);
84 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
, int has_init
, int v
, int scope
);
85 static int decl0(int l
, int is_for_loop_init
);
86 static void expr_eq(void);
87 static void unary_type(CType
*type
);
88 static void vla_runtime_type_size(CType
*type
, int *a
);
89 static void vla_sp_restore(void);
90 static void vla_sp_restore_root(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 ST_FUNC
void check_vstack(void)
124 tcc_error("internal compiler error: vstack leak (%d)", vtop
- pvtop
);
127 /* ------------------------------------------------------------------------- */
128 /* symbol allocator */
129 static Sym
*__sym_malloc(void)
131 Sym
*sym_pool
, *sym
, *last_sym
;
134 sym_pool
= tcc_malloc(SYM_POOL_NB
* sizeof(Sym
));
135 dynarray_add(&sym_pools
, &nb_sym_pools
, sym_pool
);
137 last_sym
= sym_free_first
;
139 for(i
= 0; i
< SYM_POOL_NB
; i
++) {
140 sym
->next
= last_sym
;
144 sym_free_first
= last_sym
;
148 static inline Sym
*sym_malloc(void)
151 sym
= sym_free_first
;
153 sym
= __sym_malloc();
154 sym_free_first
= sym
->next
;
158 ST_INLN
void sym_free(Sym
*sym
)
160 sym
->next
= sym_free_first
;
161 sym_free_first
= sym
;
164 /* push, without hashing */
165 ST_FUNC Sym
*sym_push2(Sym
**ps
, int v
, int t
, long c
)
168 if (ps
== &local_stack
) {
169 for (s
= *ps
; s
&& s
!= scope_stack_bottom
; s
= s
->prev
)
170 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
&& s
->v
== v
)
171 tcc_error("incompatible types for redefinition of '%s'",
172 get_tok_str(v
, NULL
));
190 /* find a symbol and return its associated structure. 's' is the top
191 of the symbol stack */
192 ST_FUNC Sym
*sym_find2(Sym
*s
, int v
)
204 /* structure lookup */
205 ST_INLN Sym
*struct_find(int v
)
208 if ((unsigned)v
>= (unsigned)(tok_ident
- TOK_IDENT
))
210 return table_ident
[v
]->sym_struct
;
213 /* find an identifier */
214 ST_INLN Sym
*sym_find(int v
)
217 if ((unsigned)v
>= (unsigned)(tok_ident
- TOK_IDENT
))
219 return table_ident
[v
]->sym_identifier
;
222 /* push a given symbol on the symbol stack */
223 ST_FUNC Sym
*sym_push(int v
, CType
*type
, int r
, int c
)
232 s
= sym_push2(ps
, v
, type
->t
, c
);
233 s
->type
.ref
= type
->ref
;
235 /* don't record fields or anonymous symbols */
237 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
238 /* record symbol in token array */
239 ts
= table_ident
[(v
& ~SYM_STRUCT
) - TOK_IDENT
];
241 ps
= &ts
->sym_struct
;
243 ps
= &ts
->sym_identifier
;
250 /* push a global identifier */
251 ST_FUNC Sym
*global_identifier_push(int v
, int t
, int c
)
254 s
= sym_push2(&global_stack
, v
, t
, c
);
255 /* don't record anonymous symbol */
256 if (v
< SYM_FIRST_ANOM
) {
257 ps
= &table_ident
[v
- TOK_IDENT
]->sym_identifier
;
258 /* modify the top most local identifier, so that
259 sym_identifier will point to 's' when popped */
261 ps
= &(*ps
)->prev_tok
;
268 /* pop symbols until top reaches 'b' */
269 ST_FUNC
void sym_pop(Sym
**ptop
, Sym
*b
)
279 /* remove symbol in token array */
281 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
282 ts
= table_ident
[(v
& ~SYM_STRUCT
) - TOK_IDENT
];
284 ps
= &ts
->sym_struct
;
286 ps
= &ts
->sym_identifier
;
295 static void weaken_symbol(Sym
*sym
)
297 sym
->type
.t
|= VT_WEAK
;
302 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
303 esym_type
= ELFW(ST_TYPE
)(esym
->st_info
);
304 esym
->st_info
= ELFW(ST_INFO
)(STB_WEAK
, esym_type
);
308 static void apply_visibility(Sym
*sym
, CType
*type
)
310 int vis
= sym
->type
.t
& VT_VIS_MASK
;
311 int vis2
= type
->t
& VT_VIS_MASK
;
312 if (vis
== (STV_DEFAULT
<< VT_VIS_SHIFT
))
314 else if (vis2
== (STV_DEFAULT
<< VT_VIS_SHIFT
))
317 vis
= (vis
< vis2
) ? vis
: vis2
;
318 sym
->type
.t
&= ~VT_VIS_MASK
;
324 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
325 vis
>>= VT_VIS_SHIFT
;
326 esym
->st_other
= (esym
->st_other
& ~ELFW(ST_VISIBILITY
)(-1)) | vis
;
330 /* ------------------------------------------------------------------------- */
332 ST_FUNC
void swap(int *p
, int *q
)
340 static void vsetc(CType
*type
, int r
, CValue
*vc
)
344 if (vtop
>= vstack
+ (VSTACK_SIZE
- 1))
345 tcc_error("memory full (vstack)");
346 /* cannot let cpu flags if other instruction are generated. Also
347 avoid leaving VT_JMP anywhere except on the top of the stack
348 because it would complicate the code generator. */
349 if (vtop
>= vstack
) {
350 v
= vtop
->r
& VT_VALMASK
;
351 if (v
== VT_CMP
|| (v
& ~1) == VT_JMP
)
361 /* push constant of type "type" with useless value */
362 ST_FUNC
void vpush(CType
*type
)
365 vsetc(type
, VT_CONST
, &cval
);
368 /* push integer constant */
369 ST_FUNC
void vpushi(int v
)
373 vsetc(&int_type
, VT_CONST
, &cval
);
376 /* push a pointer sized constant */
377 static void vpushs(addr_t v
)
381 vsetc(&size_type
, VT_CONST
, &cval
);
384 /* push arbitrary 64bit constant */
385 ST_FUNC
void vpush64(int ty
, unsigned long long v
)
392 vsetc(&ctype
, VT_CONST
, &cval
);
395 /* push long long constant */
396 static inline void vpushll(long long v
)
398 vpush64(VT_LLONG
, v
);
401 /* push a symbol value of TYPE */
402 static inline void vpushsym(CType
*type
, Sym
*sym
)
406 vsetc(type
, VT_CONST
| VT_SYM
, &cval
);
410 /* Return a static symbol pointing to a section */
411 ST_FUNC Sym
*get_sym_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
417 sym
= global_identifier_push(v
, type
->t
| VT_STATIC
, 0);
418 sym
->type
.ref
= type
->ref
;
419 sym
->r
= VT_CONST
| VT_SYM
;
420 put_extern_sym(sym
, sec
, offset
, size
);
424 /* push a reference to a section offset by adding a dummy symbol */
425 static void vpush_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
427 vpushsym(type
, get_sym_ref(type
, sec
, offset
, size
));
430 /* define a new external reference to a symbol 'v' of type 'u' */
431 ST_FUNC Sym
*external_global_sym(int v
, CType
*type
, int r
)
437 /* push forward reference */
438 s
= global_identifier_push(v
, type
->t
| VT_EXTERN
, 0);
439 s
->type
.ref
= type
->ref
;
440 s
->r
= r
| VT_CONST
| VT_SYM
;
445 /* define a new external reference to a symbol 'v' */
446 static Sym
*external_sym(int v
, CType
*type
, int r
)
452 /* push forward reference */
453 s
= sym_push(v
, type
, r
| VT_CONST
| VT_SYM
, 0);
454 s
->type
.t
|= VT_EXTERN
;
455 } else if (s
->type
.ref
== func_old_type
.ref
) {
456 s
->type
.ref
= type
->ref
;
457 s
->r
= r
| VT_CONST
| VT_SYM
;
458 s
->type
.t
|= VT_EXTERN
;
459 } else if (!is_compatible_types(&s
->type
, type
)) {
460 tcc_error("incompatible types for redefinition of '%s'",
461 get_tok_str(v
, NULL
));
463 /* Merge some storage attributes. */
464 if (type
->t
& VT_WEAK
)
467 if (type
->t
& VT_VIS_MASK
)
468 apply_visibility(s
, type
);
473 /* push a reference to global symbol v */
474 ST_FUNC
void vpush_global_sym(CType
*type
, int v
)
476 vpushsym(type
, external_global_sym(v
, type
, 0));
479 ST_FUNC
void vset(CType
*type
, int r
, int v
)
484 vsetc(type
, r
, &cval
);
487 static void vseti(int r
, int v
)
495 ST_FUNC
void vswap(void)
498 /* cannot let cpu flags if other instruction are generated. Also
499 avoid leaving VT_JMP anywhere except on the top of the stack
500 because it would complicate the code generator. */
501 if (vtop
>= vstack
) {
502 int v
= vtop
->r
& VT_VALMASK
;
503 if (v
== VT_CMP
|| (v
& ~1) == VT_JMP
)
510 /* XXX: +2% overall speed possible with optimized memswap
512 * memswap(&vtop[0], &vtop[1], sizeof *vtop);
516 ST_FUNC
void vpushv(SValue
*v
)
518 if (vtop
>= vstack
+ (VSTACK_SIZE
- 1))
519 tcc_error("memory full (vstack)");
524 static void vdup(void)
529 /* save r to the memory stack, and mark it as being free */
530 ST_FUNC
void save_reg(int r
)
532 int l
, saved
, size
, align
;
536 /* modify all stack values */
539 for(p
=vstack
;p
<=vtop
;p
++) {
540 if ((p
->r
& VT_VALMASK
) == r
||
541 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& (p
->r2
& VT_VALMASK
) == r
)) {
542 /* must save value on stack if not already done */
544 /* NOTE: must reload 'r' because r might be equal to r2 */
545 r
= p
->r
& VT_VALMASK
;
546 /* store register in the stack */
548 if ((p
->r
& VT_LVAL
) ||
549 (!is_float(type
->t
) && (type
->t
& VT_BTYPE
) != VT_LLONG
))
550 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
551 type
= &char_pointer_type
;
555 size
= type_size(type
, &align
);
556 loc
= (loc
- size
) & -align
;
558 sv
.r
= VT_LOCAL
| VT_LVAL
;
561 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
562 /* x86 specific: need to pop fp register ST0 if saved */
564 o(0xd8dd); /* fstp %st(0) */
567 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
568 /* special long long case */
569 if ((type
->t
& VT_BTYPE
) == VT_LLONG
) {
577 /* mark that stack entry as being saved on the stack */
578 if (p
->r
& VT_LVAL
) {
579 /* also clear the bounded flag because the
580 relocation address of the function was stored in
582 p
->r
= (p
->r
& ~(VT_VALMASK
| VT_BOUNDED
)) | VT_LLOCAL
;
584 p
->r
= lvalue_type(p
->type
.t
) | VT_LOCAL
;
592 #ifdef TCC_TARGET_ARM
593 /* find a register of class 'rc2' with at most one reference on stack.
594 * If none, call get_reg(rc) */
595 ST_FUNC
int get_reg_ex(int rc
, int rc2
)
600 for(r
=0;r
<NB_REGS
;r
++) {
601 if (reg_classes
[r
] & rc2
) {
604 for(p
= vstack
; p
<= vtop
; p
++) {
605 if ((p
->r
& VT_VALMASK
) == r
||
606 (p
->r2
& VT_VALMASK
) == r
)
617 /* find a free register of class 'rc'. If none, save one register */
618 ST_FUNC
int get_reg(int rc
)
623 /* find a free register */
624 for(r
=0;r
<NB_REGS
;r
++) {
625 if (reg_classes
[r
] & rc
) {
626 for(p
=vstack
;p
<=vtop
;p
++) {
627 if ((p
->r
& VT_VALMASK
) == r
||
628 (p
->r2
& VT_VALMASK
) == r
)
636 /* no register left : free the first one on the stack (VERY
637 IMPORTANT to start from the bottom to ensure that we don't
638 spill registers used in gen_opi()) */
639 for(p
=vstack
;p
<=vtop
;p
++) {
640 /* look at second register (if long long) */
641 r
= p
->r2
& VT_VALMASK
;
642 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
))
644 r
= p
->r
& VT_VALMASK
;
645 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
)) {
651 /* Should never comes here */
655 /* save registers up to (vtop - n) stack entry */
656 ST_FUNC
void save_regs(int n
)
661 for(p
= vstack
;p
<= p1
; p
++) {
662 r
= p
->r
& VT_VALMASK
;
669 /* move register 's' (of type 't') to 'r', and flush previous value of r to memory
671 static void move_reg(int r
, int s
, int t
)
685 /* get address of vtop (vtop MUST BE an lvalue) */
686 ST_FUNC
void gaddrof(void)
688 if (vtop
->r
& VT_REF
&& !nocode_wanted
)
691 /* tricky: if saved lvalue, then we can go back to lvalue */
692 if ((vtop
->r
& VT_VALMASK
) == VT_LLOCAL
)
693 vtop
->r
= (vtop
->r
& ~(VT_VALMASK
| VT_LVAL_TYPE
)) | VT_LOCAL
| VT_LVAL
;
698 #ifdef CONFIG_TCC_BCHECK
699 /* generate lvalue bound code */
700 static void gbound(void)
705 vtop
->r
&= ~VT_MUSTBOUND
;
706 /* if lvalue, then use checking code before dereferencing */
707 if (vtop
->r
& VT_LVAL
) {
708 /* if not VT_BOUNDED value, then make one */
709 if (!(vtop
->r
& VT_BOUNDED
)) {
710 lval_type
= vtop
->r
& (VT_LVAL_TYPE
| VT_LVAL
);
711 /* must save type because we must set it to int to get pointer */
713 vtop
->type
.t
= VT_PTR
;
716 gen_bounded_ptr_add();
717 vtop
->r
|= lval_type
;
720 /* then check for dereferencing */
721 gen_bounded_ptr_deref();
726 /* store vtop a register belonging to class 'rc'. lvalues are
727 converted to values. Cannot be used if cannot be converted to
728 register value (such as structures). */
729 ST_FUNC
int gv(int rc
)
731 int r
, bit_pos
, bit_size
, size
, align
, i
;
734 /* NOTE: get_reg can modify vstack[] */
735 if (vtop
->type
.t
& VT_BITFIELD
) {
738 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
739 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
740 /* remove bit field info to avoid loops */
741 vtop
->type
.t
&= ~VT_BITFIELD
& ((1 << VT_STRUCT_SHIFT
) - 1);
742 /* cast to int to propagate signedness in following ops */
743 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
748 if((vtop
->type
.t
& VT_UNSIGNED
) ||
749 (vtop
->type
.t
& VT_BTYPE
) == VT_BOOL
)
750 type
.t
|= VT_UNSIGNED
;
752 /* generate shifts */
753 vpushi(bits
- (bit_pos
+ bit_size
));
755 vpushi(bits
- bit_size
);
756 /* NOTE: transformed to SHR if unsigned */
760 if (is_float(vtop
->type
.t
) &&
761 (vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
764 unsigned long offset
;
765 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
769 /* XXX: unify with initializers handling ? */
770 /* CPUs usually cannot use float constants, so we store them
771 generically in data segment */
772 size
= type_size(&vtop
->type
, &align
);
773 offset
= (data_section
->data_offset
+ align
- 1) & -align
;
774 data_section
->data_offset
= offset
;
775 /* XXX: not portable yet */
776 #if defined(__i386__) || defined(__x86_64__)
777 /* Zero pad x87 tenbyte long doubles */
778 if (size
== LDOUBLE_SIZE
) {
779 vtop
->c
.tab
[2] &= 0xffff;
780 #if LDOUBLE_SIZE == 16
785 ptr
= section_ptr_add(data_section
, size
);
787 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
791 ptr
[i
] = vtop
->c
.tab
[size
-1-i
];
795 ptr
[i
] = vtop
->c
.tab
[i
];
796 sym
= get_sym_ref(&vtop
->type
, data_section
, offset
, size
<< 2);
797 vtop
->r
|= VT_LVAL
| VT_SYM
;
801 #ifdef CONFIG_TCC_BCHECK
802 if (vtop
->r
& VT_MUSTBOUND
)
806 r
= vtop
->r
& VT_VALMASK
;
807 rc2
= (rc
& RC_FLOAT
) ? RC_FLOAT
: RC_INT
;
808 #ifndef TCC_TARGET_ARM64
811 #ifdef TCC_TARGET_X86_64
812 else if (rc
== RC_FRET
)
817 /* need to reload if:
819 - lvalue (need to dereference pointer)
820 - already a register, but not in the right class */
822 || (vtop
->r
& VT_LVAL
)
823 || !(reg_classes
[r
] & rc
)
824 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
825 || ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
&& !(reg_classes
[vtop
->r2
] & rc2
))
826 || ((vtop
->type
.t
& VT_BTYPE
) == VT_QFLOAT
&& !(reg_classes
[vtop
->r2
] & rc2
))
828 || ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
&& !(reg_classes
[vtop
->r2
] & rc2
))
833 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
834 if (((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) || ((vtop
->type
.t
& VT_BTYPE
) == VT_QFLOAT
)) {
835 int addr_type
= VT_LLONG
, load_size
= 8, load_type
= ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) ? VT_LLONG
: VT_DOUBLE
;
837 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
838 int addr_type
= VT_INT
, load_size
= 4, load_type
= VT_INT
;
839 unsigned long long ll
;
841 int r2
, original_type
;
842 original_type
= vtop
->type
.t
;
843 /* two register type load : expand to two words
845 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
846 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
849 vtop
->c
.i
= ll
; /* first word */
851 vtop
->r
= r
; /* save register value */
852 vpushi(ll
>> 32); /* second word */
855 if (r
>= VT_CONST
|| /* XXX: test to VT_CONST incorrect ? */
856 (vtop
->r
& VT_LVAL
)) {
857 /* We do not want to modifier the long long
858 pointer here, so the safest (and less
859 efficient) is to save all the other registers
860 in the stack. XXX: totally inefficient. */
862 /* load from memory */
863 vtop
->type
.t
= load_type
;
866 vtop
[-1].r
= r
; /* save register value */
867 /* increment pointer to get second word */
868 vtop
->type
.t
= addr_type
;
873 vtop
->type
.t
= load_type
;
878 vtop
[-1].r
= r
; /* save register value */
879 vtop
->r
= vtop
[-1].r2
;
881 /* Allocate second register. Here we rely on the fact that
882 get_reg() tries first to free r2 of an SValue. */
886 /* write second register */
888 vtop
->type
.t
= original_type
;
889 } else if ((vtop
->r
& VT_LVAL
) && !is_float(vtop
->type
.t
)) {
891 /* lvalue of scalar type : need to use lvalue type
892 because of possible cast */
895 /* compute memory access type */
896 if (vtop
->r
& VT_REF
)
897 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
902 else if (vtop
->r
& VT_LVAL_BYTE
)
904 else if (vtop
->r
& VT_LVAL_SHORT
)
906 if (vtop
->r
& VT_LVAL_UNSIGNED
)
910 /* restore wanted type */
913 /* one register type load */
918 #ifdef TCC_TARGET_C67
919 /* uses register pairs for doubles */
920 if ((vtop
->type
.t
& VT_BTYPE
) == VT_DOUBLE
)
927 /* generate vtop[-1] and vtop[0] in resp. classes rc1 and rc2 */
928 ST_FUNC
void gv2(int rc1
, int rc2
)
932 /* generate more generic register first. But VT_JMP or VT_CMP
933 values must be generated first in all cases to avoid possible
935 v
= vtop
[0].r
& VT_VALMASK
;
936 if (v
!= VT_CMP
&& (v
& ~1) != VT_JMP
&& rc1
<= rc2
) {
941 /* test if reload is needed for first register */
942 if ((vtop
[-1].r
& VT_VALMASK
) >= VT_CONST
) {
952 /* test if reload is needed for first register */
953 if ((vtop
[0].r
& VT_VALMASK
) >= VT_CONST
) {
959 #ifndef TCC_TARGET_ARM64
960 /* wrapper around RC_FRET to return a register by type */
961 static int rc_fret(int t
)
963 #ifdef TCC_TARGET_X86_64
964 if (t
== VT_LDOUBLE
) {
972 /* wrapper around REG_FRET to return a register by type */
973 static int reg_fret(int t
)
975 #ifdef TCC_TARGET_X86_64
976 if (t
== VT_LDOUBLE
) {
983 /* expand long long on stack in two int registers */
984 static void lexpand(void)
988 u
= vtop
->type
.t
& (VT_DEFSIGN
| VT_UNSIGNED
);
991 vtop
[0].r
= vtop
[-1].r2
;
992 vtop
[0].r2
= VT_CONST
;
993 vtop
[-1].r2
= VT_CONST
;
994 vtop
[0].type
.t
= VT_INT
| u
;
995 vtop
[-1].type
.t
= VT_INT
| u
;
998 #ifdef TCC_TARGET_ARM
999 /* expand long long on stack */
1000 ST_FUNC
void lexpand_nr(void)
1004 u
= vtop
->type
.t
& (VT_DEFSIGN
| VT_UNSIGNED
);
1006 vtop
->r2
= VT_CONST
;
1007 vtop
->type
.t
= VT_INT
| u
;
1008 v
=vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
);
1009 if (v
== VT_CONST
) {
1010 vtop
[-1].c
.i
= vtop
->c
.i
;
1011 vtop
->c
.i
= vtop
->c
.i
>> 32;
1013 } else if (v
== (VT_LVAL
|VT_CONST
) || v
== (VT_LVAL
|VT_LOCAL
)) {
1015 vtop
->r
= vtop
[-1].r
;
1016 } else if (v
> VT_CONST
) {
1020 vtop
->r
= vtop
[-1].r2
;
1021 vtop
[-1].r2
= VT_CONST
;
1022 vtop
[-1].type
.t
= VT_INT
| u
;
1026 /* build a long long from two ints */
1027 static void lbuild(int t
)
1029 gv2(RC_INT
, RC_INT
);
1030 vtop
[-1].r2
= vtop
[0].r
;
1031 vtop
[-1].type
.t
= t
;
1035 /* rotate n first stack elements to the bottom
1036 I1 ... In -> I2 ... In I1 [top is right]
1038 ST_FUNC
void vrotb(int n
)
1044 for(i
=-n
+1;i
!=0;i
++)
1045 vtop
[i
] = vtop
[i
+1];
1049 /* rotate the n elements before entry e towards the top
1050 I1 ... In ... -> In I1 ... I(n-1) ... [top is right]
1052 ST_FUNC
void vrote(SValue
*e
, int n
)
1058 for(i
= 0;i
< n
- 1; i
++)
1063 /* rotate n first stack elements to the top
1064 I1 ... In -> In I1 ... I(n-1) [top is right]
1066 ST_FUNC
void vrott(int n
)
1071 /* pop stack value */
1072 ST_FUNC
void vpop(void)
1075 v
= vtop
->r
& VT_VALMASK
;
1076 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
1077 /* for x86, we need to pop the FP stack */
1078 if (v
== TREG_ST0
&& !nocode_wanted
) {
1079 o(0xd8dd); /* fstp %st(0) */
1082 if (v
== VT_JMP
|| v
== VT_JMPI
) {
1083 /* need to put correct jump if && or || without test */
1089 /* convert stack entry to register and duplicate its value in another
1091 static void gv_dup(void)
1097 if ((t
& VT_BTYPE
) == VT_LLONG
) {
1104 /* stack: H L L1 H1 */
1112 /* duplicate value */
1117 #ifdef TCC_TARGET_X86_64
1118 if ((t
& VT_BTYPE
) == VT_LDOUBLE
) {
1128 load(r1
, &sv
); /* move r to r1 */
1130 /* duplicates value */
1136 /* Generate value test
1138 * Generate a test for any value (jump, comparison and integers) */
1139 ST_FUNC
int gvtst(int inv
, int t
)
1141 int v
= vtop
->r
& VT_VALMASK
;
1142 if (v
!= VT_CMP
&& v
!= VT_JMP
&& v
!= VT_JMPI
) {
1146 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
1147 /* constant jmp optimization */
1148 if ((vtop
->c
.i
!= 0) != inv
)
1153 return gtst(inv
, t
);
1156 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
1157 /* generate CPU independent (unsigned) long long operations */
1158 static void gen_opl(int op
)
1160 int t
, a
, b
, op1
, c
, i
;
1162 unsigned short reg_iret
= REG_IRET
;
1163 unsigned short reg_lret
= REG_LRET
;
1169 func
= TOK___divdi3
;
1172 func
= TOK___udivdi3
;
1175 func
= TOK___moddi3
;
1178 func
= TOK___umoddi3
;
1185 /* call generic long long function */
1186 vpush_global_sym(&func_old_type
, func
);
1191 vtop
->r2
= reg_lret
;
1204 /* stack: L1 H1 L2 H2 */
1209 vtop
[-2] = vtop
[-3];
1212 /* stack: H1 H2 L1 L2 */
1218 /* stack: H1 H2 L1 L2 ML MH */
1221 /* stack: ML MH H1 H2 L1 L2 */
1225 /* stack: ML MH H1 L2 H2 L1 */
1230 /* stack: ML MH M1 M2 */
1233 } else if (op
== '+' || op
== '-') {
1234 /* XXX: add non carry method too (for MIPS or alpha) */
1240 /* stack: H1 H2 (L1 op L2) */
1243 gen_op(op1
+ 1); /* TOK_xxxC2 */
1246 /* stack: H1 H2 (L1 op L2) */
1249 /* stack: (L1 op L2) H1 H2 */
1251 /* stack: (L1 op L2) (H1 op H2) */
1259 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
1260 t
= vtop
[-1].type
.t
;
1264 /* stack: L H shift */
1266 /* constant: simpler */
1267 /* NOTE: all comments are for SHL. the other cases are
1268 done by swaping words */
1279 if (op
!= TOK_SAR
) {
1312 /* XXX: should provide a faster fallback on x86 ? */
1315 func
= TOK___ashrdi3
;
1318 func
= TOK___lshrdi3
;
1321 func
= TOK___ashldi3
;
1327 /* compare operations */
1333 /* stack: L1 H1 L2 H2 */
1335 vtop
[-1] = vtop
[-2];
1337 /* stack: L1 L2 H1 H2 */
1340 /* when values are equal, we need to compare low words. since
1341 the jump is inverted, we invert the test too. */
1344 else if (op1
== TOK_GT
)
1346 else if (op1
== TOK_ULT
)
1348 else if (op1
== TOK_UGT
)
1353 if (op1
!= TOK_NE
) {
1357 /* generate non equal test */
1358 /* XXX: NOT PORTABLE yet */
1362 #if defined(TCC_TARGET_I386)
1363 b
= psym(0x850f, 0);
1364 #elif defined(TCC_TARGET_ARM)
1366 o(0x1A000000 | encbranch(ind
, 0, 1));
1367 #elif defined(TCC_TARGET_C67) || defined(TCC_TARGET_ARM64)
1368 tcc_error("not implemented");
1370 #error not supported
1374 /* compare low. Always unsigned */
1378 else if (op1
== TOK_LE
)
1380 else if (op1
== TOK_GT
)
1382 else if (op1
== TOK_GE
)
1393 static uint64_t gen_opic_sdiv(uint64_t a
, uint64_t b
)
1395 uint64_t x
= (a
>> 63 ? -a
: a
) / (b
>> 63 ? -b
: b
);
1396 return (a
^ b
) >> 63 ? -x
: x
;
1399 static int gen_opic_lt(uint64_t a
, uint64_t b
)
1401 return (a
^ (uint64_t)1 << 63) < (b
^ (uint64_t)1 << 63);
1404 /* handle integer constant optimizations and various machine
1406 static void gen_opic(int op
)
1408 SValue
*v1
= vtop
- 1;
1410 int t1
= v1
->type
.t
& VT_BTYPE
;
1411 int t2
= v2
->type
.t
& VT_BTYPE
;
1412 int c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1413 int c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1414 uint64_t l1
= c1
? v1
->c
.i
: 0;
1415 uint64_t l2
= c2
? v2
->c
.i
: 0;
1416 int shm
= (t1
== VT_LLONG
) ? 63 : 31;
1419 l1
= ((uint32_t)l1
|
1420 (v1
->type
.t
& VT_UNSIGNED
? 0 : -(l1
& 0x80000000)));
1422 l2
= ((uint32_t)l2
|
1423 (v2
->type
.t
& VT_UNSIGNED
? 0 : -(l2
& 0x80000000)));
1427 case '+': l1
+= l2
; break;
1428 case '-': l1
-= l2
; break;
1429 case '&': l1
&= l2
; break;
1430 case '^': l1
^= l2
; break;
1431 case '|': l1
|= l2
; break;
1432 case '*': l1
*= l2
; break;
1439 /* if division by zero, generate explicit division */
1442 tcc_error("division by zero in constant");
1446 default: l1
= gen_opic_sdiv(l1
, l2
); break;
1447 case '%': l1
= l1
- l2
* gen_opic_sdiv(l1
, l2
); break;
1448 case TOK_UDIV
: l1
= l1
/ l2
; break;
1449 case TOK_UMOD
: l1
= l1
% l2
; break;
1452 case TOK_SHL
: l1
<<= (l2
& shm
); break;
1453 case TOK_SHR
: l1
>>= (l2
& shm
); break;
1455 l1
= (l1
>> 63) ? ~(~l1
>> (l2
& shm
)) : l1
>> (l2
& shm
);
1458 case TOK_ULT
: l1
= l1
< l2
; break;
1459 case TOK_UGE
: l1
= l1
>= l2
; break;
1460 case TOK_EQ
: l1
= l1
== l2
; break;
1461 case TOK_NE
: l1
= l1
!= l2
; break;
1462 case TOK_ULE
: l1
= l1
<= l2
; break;
1463 case TOK_UGT
: l1
= l1
> l2
; break;
1464 case TOK_LT
: l1
= gen_opic_lt(l1
, l2
); break;
1465 case TOK_GE
: l1
= !gen_opic_lt(l1
, l2
); break;
1466 case TOK_LE
: l1
= !gen_opic_lt(l2
, l1
); break;
1467 case TOK_GT
: l1
= gen_opic_lt(l2
, l1
); break;
1469 case TOK_LAND
: l1
= l1
&& l2
; break;
1470 case TOK_LOR
: l1
= l1
|| l2
; break;
1477 /* if commutative ops, put c2 as constant */
1478 if (c1
&& (op
== '+' || op
== '&' || op
== '^' ||
1479 op
== '|' || op
== '*')) {
1481 c2
= c1
; //c = c1, c1 = c2, c2 = c;
1482 l2
= l1
; //l = l1, l1 = l2, l2 = l;
1484 if (!const_wanted
&&
1486 (op
== TOK_SHL
|| op
== TOK_SHR
|| op
== TOK_SAR
)) ||
1487 (l1
== -1 && op
== TOK_SAR
))) {
1488 /* treat (0 << x), (0 >> x) and (-1 >> x) as constant */
1490 } else if (!const_wanted
&&
1491 c2
&& ((l2
== 0 && (op
== '&' || op
== '*')) ||
1492 (l2
== -1 && op
== '|') ||
1493 (l2
== 0xffffffff && t2
!= VT_LLONG
&& op
== '|') ||
1494 (l2
== 1 && (op
== '%' || op
== TOK_UMOD
)))) {
1495 /* treat (x & 0), (x * 0), (x | -1) and (x % 1) as constant */
1500 } else if (c2
&& (((op
== '*' || op
== '/' || op
== TOK_UDIV
||
1503 ((op
== '+' || op
== '-' || op
== '|' || op
== '^' ||
1504 op
== TOK_SHL
|| op
== TOK_SHR
|| op
== TOK_SAR
) &&
1508 /* filter out NOP operations like x*1, x-0, x&-1... */
1510 } else if (c2
&& (op
== '*' || op
== TOK_PDIV
|| op
== TOK_UDIV
)) {
1511 /* try to use shifts instead of muls or divs */
1512 if (l2
> 0 && (l2
& (l2
- 1)) == 0) {
1521 else if (op
== TOK_PDIV
)
1527 } else if (c2
&& (op
== '+' || op
== '-') &&
1528 (((vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
))
1529 || (vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
)) == VT_LOCAL
)) {
1530 /* symbol + constant case */
1537 if (!nocode_wanted
) {
1538 /* call low level op generator */
1539 if (t1
== VT_LLONG
|| t2
== VT_LLONG
||
1540 (PTR_SIZE
== 8 && (t1
== VT_PTR
|| t2
== VT_PTR
)))
1551 /* generate a floating point operation with constant propagation */
1552 static void gen_opif(int op
)
1560 /* currently, we cannot do computations with forward symbols */
1561 c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1562 c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1564 if (v1
->type
.t
== VT_FLOAT
) {
1567 } else if (v1
->type
.t
== VT_DOUBLE
) {
1575 /* NOTE: we only do constant propagation if finite number (not
1576 NaN or infinity) (ANSI spec) */
1577 if (!ieee_finite(f1
) || !ieee_finite(f2
))
1581 case '+': f1
+= f2
; break;
1582 case '-': f1
-= f2
; break;
1583 case '*': f1
*= f2
; break;
1587 tcc_error("division by zero in constant");
1592 /* XXX: also handles tests ? */
1596 /* XXX: overflow test ? */
1597 if (v1
->type
.t
== VT_FLOAT
) {
1599 } else if (v1
->type
.t
== VT_DOUBLE
) {
1607 if (!nocode_wanted
) {
1615 static int pointed_size(CType
*type
)
1618 return type_size(pointed_type(type
), &align
);
1621 static void vla_runtime_pointed_size(CType
*type
)
1624 vla_runtime_type_size(pointed_type(type
), &align
);
1627 static inline int is_null_pointer(SValue
*p
)
1629 if ((p
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
1631 return ((p
->type
.t
& VT_BTYPE
) == VT_INT
&& (uint32_t)p
->c
.i
== 0) ||
1632 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& p
->c
.i
== 0) ||
1633 ((p
->type
.t
& VT_BTYPE
) == VT_PTR
&&
1634 (PTR_SIZE
== 4 ? (uint32_t)p
->c
.i
== 0 : p
->c
.i
== 0));
1637 static inline int is_integer_btype(int bt
)
1639 return (bt
== VT_BYTE
|| bt
== VT_SHORT
||
1640 bt
== VT_INT
|| bt
== VT_LLONG
);
1643 /* check types for comparison or subtraction of pointers */
1644 static void check_comparison_pointer_types(SValue
*p1
, SValue
*p2
, int op
)
1646 CType
*type1
, *type2
, tmp_type1
, tmp_type2
;
1649 /* null pointers are accepted for all comparisons as gcc */
1650 if (is_null_pointer(p1
) || is_null_pointer(p2
))
1654 bt1
= type1
->t
& VT_BTYPE
;
1655 bt2
= type2
->t
& VT_BTYPE
;
1656 /* accept comparison between pointer and integer with a warning */
1657 if ((is_integer_btype(bt1
) || is_integer_btype(bt2
)) && op
!= '-') {
1658 if (op
!= TOK_LOR
&& op
!= TOK_LAND
)
1659 tcc_warning("comparison between pointer and integer");
1663 /* both must be pointers or implicit function pointers */
1664 if (bt1
== VT_PTR
) {
1665 type1
= pointed_type(type1
);
1666 } else if (bt1
!= VT_FUNC
)
1667 goto invalid_operands
;
1669 if (bt2
== VT_PTR
) {
1670 type2
= pointed_type(type2
);
1671 } else if (bt2
!= VT_FUNC
) {
1673 tcc_error("invalid operands to binary %s", get_tok_str(op
, NULL
));
1675 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
1676 (type2
->t
& VT_BTYPE
) == VT_VOID
)
1680 tmp_type1
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1681 tmp_type2
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1682 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
1683 /* gcc-like error if '-' is used */
1685 goto invalid_operands
;
1687 tcc_warning("comparison of distinct pointer types lacks a cast");
1691 /* generic gen_op: handles types problems */
1692 ST_FUNC
void gen_op(int op
)
1694 int u
, t1
, t2
, bt1
, bt2
, t
;
1697 t1
= vtop
[-1].type
.t
;
1698 t2
= vtop
[0].type
.t
;
1699 bt1
= t1
& VT_BTYPE
;
1700 bt2
= t2
& VT_BTYPE
;
1702 if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
1703 /* at least one operand is a pointer */
1704 /* relationnal op: must be both pointers */
1705 if (op
>= TOK_ULT
&& op
<= TOK_LOR
) {
1706 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1707 /* pointers are handled are unsigned */
1708 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1709 t
= VT_LLONG
| VT_UNSIGNED
;
1711 t
= VT_INT
| VT_UNSIGNED
;
1715 /* if both pointers, then it must be the '-' op */
1716 if (bt1
== VT_PTR
&& bt2
== VT_PTR
) {
1718 tcc_error("cannot use pointers here");
1719 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1720 /* XXX: check that types are compatible */
1721 if (vtop
[-1].type
.t
& VT_VLA
) {
1722 vla_runtime_pointed_size(&vtop
[-1].type
);
1724 vpushi(pointed_size(&vtop
[-1].type
));
1728 /* set to integer type */
1729 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1730 vtop
->type
.t
= VT_LLONG
;
1732 vtop
->type
.t
= VT_INT
;
1737 /* exactly one pointer : must be '+' or '-'. */
1738 if (op
!= '-' && op
!= '+')
1739 tcc_error("cannot use pointers here");
1740 /* Put pointer as first operand */
1741 if (bt2
== VT_PTR
) {
1745 type1
= vtop
[-1].type
;
1746 type1
.t
&= ~VT_ARRAY
;
1747 if (vtop
[-1].type
.t
& VT_VLA
)
1748 vla_runtime_pointed_size(&vtop
[-1].type
);
1750 u
= pointed_size(&vtop
[-1].type
);
1752 tcc_error("unknown array element size");
1753 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1756 /* XXX: cast to int ? (long long case) */
1762 /* #ifdef CONFIG_TCC_BCHECK
1763 The main reason to removing this code:
1770 fprintf(stderr, "v+i-j = %p\n", v+i-j);
1771 fprintf(stderr, "v+(i-j) = %p\n", v+(i-j));
1773 When this code is on. then the output looks like
1775 v+(i-j) = 0xbff84000
1777 /* if evaluating constant expression, no code should be
1778 generated, so no bound check */
1779 if (tcc_state
->do_bounds_check
&& !const_wanted
) {
1780 /* if bounded pointers, we generate a special code to
1787 gen_bounded_ptr_add();
1793 /* put again type if gen_opic() swaped operands */
1796 } else if (is_float(bt1
) || is_float(bt2
)) {
1797 /* compute bigger type and do implicit casts */
1798 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
1800 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
1805 /* floats can only be used for a few operations */
1806 if (op
!= '+' && op
!= '-' && op
!= '*' && op
!= '/' &&
1807 (op
< TOK_ULT
|| op
> TOK_GT
))
1808 tcc_error("invalid operands for binary operation");
1810 } else if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
) {
1811 t
= bt1
== VT_LLONG
? VT_LLONG
: VT_INT
;
1812 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (t
| VT_UNSIGNED
))
1815 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
1816 /* cast to biggest op */
1818 /* convert to unsigned if it does not fit in a long long */
1819 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
1820 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
1823 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
1824 tcc_error("comparison of struct");
1826 /* integer operations */
1828 /* convert to unsigned if it does not fit in an integer */
1829 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
1830 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
1833 /* XXX: currently, some unsigned operations are explicit, so
1834 we modify them here */
1835 if (t
& VT_UNSIGNED
) {
1842 else if (op
== TOK_LT
)
1844 else if (op
== TOK_GT
)
1846 else if (op
== TOK_LE
)
1848 else if (op
== TOK_GE
)
1855 /* special case for shifts and long long: we keep the shift as
1857 if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
)
1864 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
1865 /* relationnal op: the result is an int */
1866 vtop
->type
.t
= VT_INT
;
1871 // Make sure that we have converted to an rvalue:
1872 if (vtop
->r
& VT_LVAL
&& !nocode_wanted
)
1873 gv(is_float(vtop
->type
.t
& VT_BTYPE
) ? RC_FLOAT
: RC_INT
);
1876 #ifndef TCC_TARGET_ARM
1877 /* generic itof for unsigned long long case */
1878 static void gen_cvt_itof1(int t
)
1880 #ifdef TCC_TARGET_ARM64
1883 if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
1884 (VT_LLONG
| VT_UNSIGNED
)) {
1887 vpush_global_sym(&func_old_type
, TOK___floatundisf
);
1888 #if LDOUBLE_SIZE != 8
1889 else if (t
== VT_LDOUBLE
)
1890 vpush_global_sym(&func_old_type
, TOK___floatundixf
);
1893 vpush_global_sym(&func_old_type
, TOK___floatundidf
);
1897 vtop
->r
= reg_fret(t
);
1905 /* generic ftoi for unsigned long long case */
1906 static void gen_cvt_ftoi1(int t
)
1908 #ifdef TCC_TARGET_ARM64
1913 if (t
== (VT_LLONG
| VT_UNSIGNED
)) {
1914 /* not handled natively */
1915 st
= vtop
->type
.t
& VT_BTYPE
;
1917 vpush_global_sym(&func_old_type
, TOK___fixunssfdi
);
1918 #if LDOUBLE_SIZE != 8
1919 else if (st
== VT_LDOUBLE
)
1920 vpush_global_sym(&func_old_type
, TOK___fixunsxfdi
);
1923 vpush_global_sym(&func_old_type
, TOK___fixunsdfdi
);
1928 vtop
->r2
= REG_LRET
;
1935 /* force char or short cast */
1936 static void force_charshort_cast(int t
)
1940 /* XXX: add optimization if lvalue : just change type and offset */
1945 if (t
& VT_UNSIGNED
) {
1946 vpushi((1 << bits
) - 1);
1952 /* result must be signed or the SAR is converted to an SHL
1953 This was not the case when "t" was a signed short
1954 and the last value on the stack was an unsigned int */
1955 vtop
->type
.t
&= ~VT_UNSIGNED
;
1961 /* cast 'vtop' to 'type'. Casting to bitfields is forbidden. */
1962 static void gen_cast(CType
*type
)
1964 int sbt
, dbt
, sf
, df
, c
, p
;
1966 /* special delayed cast for char/short */
1967 /* XXX: in some cases (multiple cascaded casts), it may still
1969 if (vtop
->r
& VT_MUSTCAST
) {
1970 vtop
->r
&= ~VT_MUSTCAST
;
1971 force_charshort_cast(vtop
->type
.t
);
1974 /* bitfields first get cast to ints */
1975 if (vtop
->type
.t
& VT_BITFIELD
&& !nocode_wanted
) {
1979 dbt
= type
->t
& (VT_BTYPE
| VT_UNSIGNED
);
1980 sbt
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
1985 c
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1986 p
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
);
1988 /* constant case: we can do it now */
1989 /* XXX: in ISOC, cannot do it if error in convert */
1990 if (sbt
== VT_FLOAT
)
1991 vtop
->c
.ld
= vtop
->c
.f
;
1992 else if (sbt
== VT_DOUBLE
)
1993 vtop
->c
.ld
= vtop
->c
.d
;
1996 if ((sbt
& VT_BTYPE
) == VT_LLONG
) {
1997 if ((sbt
& VT_UNSIGNED
) || !(vtop
->c
.i
>> 63))
1998 vtop
->c
.ld
= vtop
->c
.i
;
2000 vtop
->c
.ld
= -(long double)-vtop
->c
.i
;
2002 if ((sbt
& VT_UNSIGNED
) || !(vtop
->c
.i
>> 31))
2003 vtop
->c
.ld
= (uint32_t)vtop
->c
.i
;
2005 vtop
->c
.ld
= -(long double)-(uint32_t)vtop
->c
.i
;
2008 if (dbt
== VT_FLOAT
)
2009 vtop
->c
.f
= (float)vtop
->c
.ld
;
2010 else if (dbt
== VT_DOUBLE
)
2011 vtop
->c
.d
= (double)vtop
->c
.ld
;
2012 } else if (sf
&& dbt
== (VT_LLONG
|VT_UNSIGNED
)) {
2013 vtop
->c
.i
= vtop
->c
.ld
;
2014 } else if (sf
&& dbt
== VT_BOOL
) {
2015 vtop
->c
.i
= (vtop
->c
.ld
!= 0);
2018 vtop
->c
.i
= vtop
->c
.ld
;
2019 else if (sbt
== (VT_LLONG
|VT_UNSIGNED
))
2021 else if (sbt
& VT_UNSIGNED
)
2022 vtop
->c
.i
= (uint32_t)vtop
->c
.i
;
2023 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2024 else if (sbt
== VT_PTR
)
2027 else if (sbt
!= VT_LLONG
)
2028 vtop
->c
.i
= ((uint32_t)vtop
->c
.i
|
2029 -(vtop
->c
.i
& 0x80000000));
2031 if (dbt
== (VT_LLONG
|VT_UNSIGNED
))
2033 else if (dbt
== VT_BOOL
)
2034 vtop
->c
.i
= (vtop
->c
.i
!= 0);
2035 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2036 else if (dbt
== VT_PTR
)
2039 else if (dbt
!= VT_LLONG
) {
2040 uint32_t m
= ((dbt
& VT_BTYPE
) == VT_BYTE
? 0xff :
2041 (dbt
& VT_BTYPE
) == VT_SHORT
? 0xffff :
2044 if (!(dbt
& VT_UNSIGNED
))
2045 vtop
->c
.i
|= -(vtop
->c
.i
& ((m
>> 1) + 1));
2048 } else if (p
&& dbt
== VT_BOOL
) {
2051 } else if (!nocode_wanted
) {
2052 /* non constant case: generate code */
2054 /* convert from fp to fp */
2057 /* convert int to fp */
2060 /* convert fp to int */
2061 if (dbt
== VT_BOOL
) {
2065 /* we handle char/short/etc... with generic code */
2066 if (dbt
!= (VT_INT
| VT_UNSIGNED
) &&
2067 dbt
!= (VT_LLONG
| VT_UNSIGNED
) &&
2071 if (dbt
== VT_INT
&& (type
->t
& (VT_BTYPE
| VT_UNSIGNED
)) != dbt
) {
2072 /* additional cast for char/short... */
2077 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
2078 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
) {
2079 if ((sbt
& VT_BTYPE
) != VT_LLONG
&& !nocode_wanted
) {
2080 /* scalar to long long */
2081 /* machine independent conversion */
2083 /* generate high word */
2084 if (sbt
== (VT_INT
| VT_UNSIGNED
)) {
2088 if (sbt
== VT_PTR
) {
2089 /* cast from pointer to int before we apply
2090 shift operation, which pointers don't support*/
2091 gen_cast(&int_type
);
2097 /* patch second register */
2098 vtop
[-1].r2
= vtop
->r
;
2102 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
||
2103 (dbt
& VT_BTYPE
) == VT_PTR
||
2104 (dbt
& VT_BTYPE
) == VT_FUNC
) {
2105 if ((sbt
& VT_BTYPE
) != VT_LLONG
&&
2106 (sbt
& VT_BTYPE
) != VT_PTR
&&
2107 (sbt
& VT_BTYPE
) != VT_FUNC
&& !nocode_wanted
) {
2108 /* need to convert from 32bit to 64bit */
2110 if (sbt
!= (VT_INT
| VT_UNSIGNED
)) {
2111 #if defined(TCC_TARGET_ARM64)
2113 #elif defined(TCC_TARGET_X86_64)
2115 /* x86_64 specific: movslq */
2117 o(0xc0 + (REG_VALUE(r
) << 3) + REG_VALUE(r
));
2124 } else if (dbt
== VT_BOOL
) {
2125 /* scalar to bool */
2128 } else if ((dbt
& VT_BTYPE
) == VT_BYTE
||
2129 (dbt
& VT_BTYPE
) == VT_SHORT
) {
2130 if (sbt
== VT_PTR
) {
2131 vtop
->type
.t
= VT_INT
;
2132 tcc_warning("nonportable conversion from pointer to char/short");
2134 force_charshort_cast(dbt
);
2135 } else if ((dbt
& VT_BTYPE
) == VT_INT
) {
2137 if (sbt
== VT_LLONG
&& !nocode_wanted
) {
2138 /* from long long: just take low order word */
2142 /* if lvalue and single word type, nothing to do because
2143 the lvalue already contains the real type size (see
2144 VT_LVAL_xxx constants) */
2147 } else if ((dbt
& VT_BTYPE
) == VT_PTR
&& !(vtop
->r
& VT_LVAL
)) {
2148 /* if we are casting between pointer types,
2149 we must update the VT_LVAL_xxx size */
2150 vtop
->r
= (vtop
->r
& ~VT_LVAL_TYPE
)
2151 | (lvalue_type(type
->ref
->type
.t
) & VT_LVAL_TYPE
);
2156 /* return type size as known at compile time. Put alignment at 'a' */
2157 ST_FUNC
int type_size(CType
*type
, int *a
)
2162 bt
= type
->t
& VT_BTYPE
;
2163 if (bt
== VT_STRUCT
) {
2168 } else if (bt
== VT_PTR
) {
2169 if (type
->t
& VT_ARRAY
) {
2173 ts
= type_size(&s
->type
, a
);
2175 if (ts
< 0 && s
->c
< 0)
2183 } else if (bt
== VT_LDOUBLE
) {
2185 return LDOUBLE_SIZE
;
2186 } else if (bt
== VT_DOUBLE
|| bt
== VT_LLONG
) {
2187 #ifdef TCC_TARGET_I386
2188 #ifdef TCC_TARGET_PE
2193 #elif defined(TCC_TARGET_ARM)
2203 } else if (bt
== VT_INT
|| bt
== VT_ENUM
|| bt
== VT_FLOAT
) {
2206 } else if (bt
== VT_SHORT
) {
2209 } else if (bt
== VT_QLONG
|| bt
== VT_QFLOAT
) {
2213 /* char, void, function, _Bool */
2219 /* push type size as known at runtime time on top of value stack. Put
2221 ST_FUNC
void vla_runtime_type_size(CType
*type
, int *a
)
2223 if (type
->t
& VT_VLA
) {
2224 vset(&int_type
, VT_LOCAL
|VT_LVAL
, type
->ref
->c
);
2226 vpushi(type_size(type
, a
));
2230 static void vla_sp_restore(void) {
2231 if (vlas_in_scope
) {
2232 gen_vla_sp_restore(vla_sp_loc
);
2236 static void vla_sp_restore_root(void) {
2237 if (vlas_in_scope
) {
2238 gen_vla_sp_restore(vla_sp_root_loc
);
2242 /* return the pointed type of t */
2243 static inline CType
*pointed_type(CType
*type
)
2245 return &type
->ref
->type
;
2248 /* modify type so that its it is a pointer to type. */
2249 ST_FUNC
void mk_pointer(CType
*type
)
2252 s
= sym_push(SYM_FIELD
, type
, 0, -1);
2253 type
->t
= VT_PTR
| (type
->t
& ~VT_TYPE
);
2257 /* compare function types. OLD functions match any new functions */
2258 static int is_compatible_func(CType
*type1
, CType
*type2
)
2264 if (!is_compatible_types(&s1
->type
, &s2
->type
))
2266 /* check func_call */
2267 if (s1
->a
.func_call
!= s2
->a
.func_call
)
2269 /* XXX: not complete */
2270 if (s1
->c
== FUNC_OLD
|| s2
->c
== FUNC_OLD
)
2274 while (s1
!= NULL
) {
2277 if (!is_compatible_parameter_types(&s1
->type
, &s2
->type
))
2287 /* return true if type1 and type2 are the same. If unqualified is
2288 true, qualifiers on the types are ignored.
2290 - enums are not checked as gcc __builtin_types_compatible_p ()
2292 static int compare_types(CType
*type1
, CType
*type2
, int unqualified
)
2296 t1
= type1
->t
& VT_TYPE
;
2297 t2
= type2
->t
& VT_TYPE
;
2299 /* strip qualifiers before comparing */
2300 t1
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2301 t2
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2303 /* Default Vs explicit signedness only matters for char */
2304 if ((t1
& VT_BTYPE
) != VT_BYTE
) {
2308 /* XXX: bitfields ? */
2311 /* test more complicated cases */
2312 bt1
= t1
& VT_BTYPE
;
2313 if (bt1
== VT_PTR
) {
2314 type1
= pointed_type(type1
);
2315 type2
= pointed_type(type2
);
2316 return is_compatible_types(type1
, type2
);
2317 } else if (bt1
== VT_STRUCT
) {
2318 return (type1
->ref
== type2
->ref
);
2319 } else if (bt1
== VT_FUNC
) {
2320 return is_compatible_func(type1
, type2
);
2326 /* return true if type1 and type2 are exactly the same (including
2329 static int is_compatible_types(CType
*type1
, CType
*type2
)
2331 return compare_types(type1
,type2
,0);
2334 /* return true if type1 and type2 are the same (ignoring qualifiers).
2336 static int is_compatible_parameter_types(CType
*type1
, CType
*type2
)
2338 return compare_types(type1
,type2
,1);
2341 /* print a type. If 'varstr' is not NULL, then the variable is also
2342 printed in the type */
2344 /* XXX: add array and function pointers */
2345 static void type_to_str(char *buf
, int buf_size
,
2346 CType
*type
, const char *varstr
)
2353 t
= type
->t
& VT_TYPE
;
2356 if (t
& VT_CONSTANT
)
2357 pstrcat(buf
, buf_size
, "const ");
2358 if (t
& VT_VOLATILE
)
2359 pstrcat(buf
, buf_size
, "volatile ");
2360 if ((t
& (VT_DEFSIGN
| VT_UNSIGNED
)) == (VT_DEFSIGN
| VT_UNSIGNED
))
2361 pstrcat(buf
, buf_size
, "unsigned ");
2362 else if (t
& VT_DEFSIGN
)
2363 pstrcat(buf
, buf_size
, "signed ");
2393 tstr
= "long double";
2395 pstrcat(buf
, buf_size
, tstr
);
2399 if (bt
== VT_STRUCT
)
2403 pstrcat(buf
, buf_size
, tstr
);
2404 v
= type
->ref
->v
& ~SYM_STRUCT
;
2405 if (v
>= SYM_FIRST_ANOM
)
2406 pstrcat(buf
, buf_size
, "<anonymous>");
2408 pstrcat(buf
, buf_size
, get_tok_str(v
, NULL
));
2412 type_to_str(buf
, buf_size
, &s
->type
, varstr
);
2413 pstrcat(buf
, buf_size
, "(");
2415 while (sa
!= NULL
) {
2416 type_to_str(buf1
, sizeof(buf1
), &sa
->type
, NULL
);
2417 pstrcat(buf
, buf_size
, buf1
);
2420 pstrcat(buf
, buf_size
, ", ");
2422 pstrcat(buf
, buf_size
, ")");
2427 snprintf(buf1
, sizeof(buf1
), "%s[%ld]", varstr
? varstr
: "", s
->c
);
2428 type_to_str(buf
, buf_size
, &s
->type
, buf1
);
2431 pstrcpy(buf1
, sizeof(buf1
), "*");
2432 if (t
& VT_CONSTANT
)
2433 pstrcat(buf1
, buf_size
, "const ");
2434 if (t
& VT_VOLATILE
)
2435 pstrcat(buf1
, buf_size
, "volatile ");
2437 pstrcat(buf1
, sizeof(buf1
), varstr
);
2438 type_to_str(buf
, buf_size
, &s
->type
, buf1
);
2442 pstrcat(buf
, buf_size
, " ");
2443 pstrcat(buf
, buf_size
, varstr
);
2448 /* verify type compatibility to store vtop in 'dt' type, and generate
2450 static void gen_assign_cast(CType
*dt
)
2452 CType
*st
, *type1
, *type2
, tmp_type1
, tmp_type2
;
2453 char buf1
[256], buf2
[256];
2456 st
= &vtop
->type
; /* source type */
2457 dbt
= dt
->t
& VT_BTYPE
;
2458 sbt
= st
->t
& VT_BTYPE
;
2459 if (sbt
== VT_VOID
|| dbt
== VT_VOID
) {
2460 if (sbt
== VT_VOID
&& dbt
== VT_VOID
)
2462 It is Ok if both are void
2468 gcc accepts this program
2471 tcc_error("cannot cast from/to void");
2473 if (dt
->t
& VT_CONSTANT
)
2474 tcc_warning("assignment of read-only location");
2477 /* special cases for pointers */
2478 /* '0' can also be a pointer */
2479 if (is_null_pointer(vtop
))
2481 /* accept implicit pointer to integer cast with warning */
2482 if (is_integer_btype(sbt
)) {
2483 tcc_warning("assignment makes pointer from integer without a cast");
2486 type1
= pointed_type(dt
);
2487 /* a function is implicitely a function pointer */
2488 if (sbt
== VT_FUNC
) {
2489 if ((type1
->t
& VT_BTYPE
) != VT_VOID
&&
2490 !is_compatible_types(pointed_type(dt
), st
))
2491 tcc_warning("assignment from incompatible pointer type");
2496 type2
= pointed_type(st
);
2497 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
2498 (type2
->t
& VT_BTYPE
) == VT_VOID
) {
2499 /* void * can match anything */
2501 /* exact type match, except for unsigned */
2504 tmp_type1
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
|
2506 tmp_type2
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
|
2508 if (!is_compatible_types(&tmp_type1
, &tmp_type2
))
2509 tcc_warning("assignment from incompatible pointer type");
2511 /* check const and volatile */
2512 if ((!(type1
->t
& VT_CONSTANT
) && (type2
->t
& VT_CONSTANT
)) ||
2513 (!(type1
->t
& VT_VOLATILE
) && (type2
->t
& VT_VOLATILE
)))
2514 tcc_warning("assignment discards qualifiers from pointer target type");
2520 if (sbt
== VT_PTR
|| sbt
== VT_FUNC
) {
2521 tcc_warning("assignment makes integer from pointer without a cast");
2523 /* XXX: more tests */
2528 tmp_type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2529 tmp_type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2530 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
2532 type_to_str(buf1
, sizeof(buf1
), st
, NULL
);
2533 type_to_str(buf2
, sizeof(buf2
), dt
, NULL
);
2534 tcc_error("cannot cast '%s' to '%s'", buf1
, buf2
);
2542 /* store vtop in lvalue pushed on stack */
2543 ST_FUNC
void vstore(void)
2545 int sbt
, dbt
, ft
, r
, t
, size
, align
, bit_size
, bit_pos
, rc
, delayed_cast
;
2547 ft
= vtop
[-1].type
.t
;
2548 sbt
= vtop
->type
.t
& VT_BTYPE
;
2549 dbt
= ft
& VT_BTYPE
;
2550 if ((((sbt
== VT_INT
|| sbt
== VT_SHORT
) && dbt
== VT_BYTE
) ||
2551 (sbt
== VT_INT
&& dbt
== VT_SHORT
))
2552 && !(vtop
->type
.t
& VT_BITFIELD
)) {
2553 /* optimize char/short casts */
2554 delayed_cast
= VT_MUSTCAST
;
2555 vtop
->type
.t
= (ft
& VT_TYPE
& ~VT_BITFIELD
&
2556 ((1 << VT_STRUCT_SHIFT
) - 1));
2557 /* XXX: factorize */
2558 if (ft
& VT_CONSTANT
)
2559 tcc_warning("assignment of read-only location");
2562 if (!(ft
& VT_BITFIELD
))
2563 gen_assign_cast(&vtop
[-1].type
);
2566 if (sbt
== VT_STRUCT
) {
2567 /* if structure, only generate pointer */
2568 /* structure assignment : generate memcpy */
2569 /* XXX: optimize if small size */
2570 if (!nocode_wanted
) {
2571 size
= type_size(&vtop
->type
, &align
);
2575 vtop
->type
.t
= VT_PTR
;
2578 /* address of memcpy() */
2581 vpush_global_sym(&func_old_type
, TOK_memcpy8
);
2582 else if(!(align
& 3))
2583 vpush_global_sym(&func_old_type
, TOK_memcpy4
);
2586 /* Use memmove, rather than memcpy, as dest and src may be same: */
2587 vpush_global_sym(&func_old_type
, TOK_memmove
);
2592 vtop
->type
.t
= VT_PTR
;
2601 /* leave source on stack */
2602 } else if (ft
& VT_BITFIELD
) {
2603 /* bitfield store handling */
2605 /* save lvalue as expression result (example: s.b = s.a = n;) */
2606 vdup(), vtop
[-1] = vtop
[-2];
2608 bit_pos
= (ft
>> VT_STRUCT_SHIFT
) & 0x3f;
2609 bit_size
= (ft
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
2610 /* remove bit field info to avoid loops */
2611 vtop
[-1].type
.t
= ft
& ~VT_BITFIELD
& ((1 << VT_STRUCT_SHIFT
) - 1);
2613 if((ft
& VT_BTYPE
) == VT_BOOL
) {
2614 gen_cast(&vtop
[-1].type
);
2615 vtop
[-1].type
.t
= (vtop
[-1].type
.t
& ~VT_BTYPE
) | (VT_BYTE
| VT_UNSIGNED
);
2618 /* duplicate destination */
2620 vtop
[-1] = vtop
[-2];
2622 /* mask and shift source */
2623 if((ft
& VT_BTYPE
) != VT_BOOL
) {
2624 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2625 vpushll((1ULL << bit_size
) - 1ULL);
2627 vpushi((1 << bit_size
) - 1);
2633 /* load destination, mask and or with source */
2635 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2636 vpushll(~(((1ULL << bit_size
) - 1ULL) << bit_pos
));
2638 vpushi(~(((1 << bit_size
) - 1) << bit_pos
));
2644 /* ... and discard */
2648 if (!nocode_wanted
) {
2649 #ifdef CONFIG_TCC_BCHECK
2650 /* bound check case */
2651 if (vtop
[-1].r
& VT_MUSTBOUND
) {
2660 #ifdef TCC_TARGET_X86_64
2661 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
2663 } else if ((ft
& VT_BTYPE
) == VT_QFLOAT
) {
2668 r
= gv(rc
); /* generate value */
2669 /* if lvalue was saved on stack, must read it */
2670 if ((vtop
[-1].r
& VT_VALMASK
) == VT_LLOCAL
) {
2672 t
= get_reg(RC_INT
);
2673 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2678 sv
.r
= VT_LOCAL
| VT_LVAL
;
2679 sv
.c
.i
= vtop
[-1].c
.i
;
2681 vtop
[-1].r
= t
| VT_LVAL
;
2683 /* two word case handling : store second register at word + 4 (or +8 for x86-64) */
2684 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2685 if (((ft
& VT_BTYPE
) == VT_QLONG
) || ((ft
& VT_BTYPE
) == VT_QFLOAT
)) {
2686 int addr_type
= VT_LLONG
, load_size
= 8, load_type
= ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) ? VT_LLONG
: VT_DOUBLE
;
2688 if ((ft
& VT_BTYPE
) == VT_LLONG
) {
2689 int addr_type
= VT_INT
, load_size
= 4, load_type
= VT_INT
;
2691 vtop
[-1].type
.t
= load_type
;
2694 /* convert to int to increment easily */
2695 vtop
->type
.t
= addr_type
;
2701 vtop
[-1].type
.t
= load_type
;
2702 /* XXX: it works because r2 is spilled last ! */
2703 store(vtop
->r2
, vtop
- 1);
2709 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
2710 vtop
->r
|= delayed_cast
;
2714 /* post defines POST/PRE add. c is the token ++ or -- */
2715 ST_FUNC
void inc(int post
, int c
)
2718 vdup(); /* save lvalue */
2721 gv_dup(); /* duplicate value */
2723 vdup(); /* duplicate value */
2728 vpushi(c
- TOK_MID
);
2730 vstore(); /* store value */
2732 vpop(); /* if post op, return saved value */
2735 /* Parse GNUC __attribute__ extension. Currently, the following
2736 extensions are recognized:
2737 - aligned(n) : set data/function alignment.
2738 - packed : force data alignment to 1
2739 - section(x) : generate data/code in this section.
2740 - unused : currently ignored, but may be used someday.
2741 - regparm(n) : pass function parameters in registers (i386 only)
2743 static void parse_attribute(AttributeDef
*ad
)
2747 while (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
) {
2751 while (tok
!= ')') {
2752 if (tok
< TOK_IDENT
)
2753 expect("attribute name");
2761 expect("section name");
2762 ad
->section
= find_section(tcc_state
, (char *)tokc
.str
.data
);
2770 expect("alias(\"target\")");
2771 ad
->alias_target
= /* save string as token, for later */
2772 tok_alloc((char*)tokc
.str
.data
, tokc
.str
.size
-1)->tok
;
2776 case TOK_VISIBILITY1
:
2777 case TOK_VISIBILITY2
:
2780 expect("visibility(\"default|hidden|internal|protected\")");
2781 if (!strcmp (tokc
.str
.data
, "default"))
2782 ad
->a
.visibility
= STV_DEFAULT
;
2783 else if (!strcmp (tokc
.str
.data
, "hidden"))
2784 ad
->a
.visibility
= STV_HIDDEN
;
2785 else if (!strcmp (tokc
.str
.data
, "internal"))
2786 ad
->a
.visibility
= STV_INTERNAL
;
2787 else if (!strcmp (tokc
.str
.data
, "protected"))
2788 ad
->a
.visibility
= STV_PROTECTED
;
2790 expect("visibility(\"default|hidden|internal|protected\")");
2799 if (n
<= 0 || (n
& (n
- 1)) != 0)
2800 tcc_error("alignment must be a positive power of two");
2817 /* currently, no need to handle it because tcc does not
2818 track unused objects */
2822 /* currently, no need to handle it because tcc does not
2823 track unused objects */
2828 ad
->a
.func_call
= FUNC_CDECL
;
2833 ad
->a
.func_call
= FUNC_STDCALL
;
2835 #ifdef TCC_TARGET_I386
2845 ad
->a
.func_call
= FUNC_FASTCALL1
+ n
- 1;
2851 ad
->a
.func_call
= FUNC_FASTCALLW
;
2858 ad
->a
.mode
= VT_LLONG
+ 1;
2861 ad
->a
.mode
= VT_SHORT
+ 1;
2864 ad
->a
.mode
= VT_INT
+ 1;
2867 tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok
, NULL
));
2874 ad
->a
.func_export
= 1;
2877 ad
->a
.func_import
= 1;
2880 if (tcc_state
->warn_unsupported
)
2881 tcc_warning("'%s' attribute ignored", get_tok_str(t
, NULL
));
2882 /* skip parameters */
2884 int parenthesis
= 0;
2888 else if (tok
== ')')
2891 } while (parenthesis
&& tok
!= -1);
2904 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
2905 static void struct_decl(CType
*type
, int u
, int tdef
)
2907 int a
, v
, size
, align
, maxalign
, c
, offset
, flexible
;
2908 int bit_size
, bit_pos
, bsize
, bt
, lbit_pos
, prevbt
;
2909 Sym
*s
, *ss
, *ass
, **ps
;
2913 a
= tok
; /* save decl type */
2918 /* struct already defined ? return it */
2920 expect("struct/union/enum name");
2924 tcc_error("invalid type");
2926 } else if (tok
>= TOK_IDENT
&& !tdef
)
2927 tcc_error("unknown struct/union/enum");
2933 /* we put an undefined size for struct/union */
2934 s
= sym_push(v
| SYM_STRUCT
, &type1
, 0, -1);
2935 s
->r
= 0; /* default alignment is zero as gcc */
2936 /* put struct/union/enum name in type */
2944 tcc_error("struct/union/enum already defined");
2945 /* cannot be empty */
2947 /* non empty enums are not allowed */
2948 if (a
== TOK_ENUM
) {
2952 expect("identifier");
2954 if (ss
&& !local_stack
)
2955 tcc_error("redefinition of enumerator '%s'",
2956 get_tok_str(v
, NULL
));
2962 /* enum symbols have static storage */
2963 ss
= sym_push(v
, &int_type
, VT_CONST
, c
);
2964 ss
->type
.t
|= VT_STATIC
;
2969 /* NOTE: we accept a trailing comma */
2973 s
->c
= type_size(&int_type
, &align
);
2982 while (tok
!= '}') {
2983 parse_btype(&btype
, &ad
);
2986 tcc_error("flexible array member '%s' not at the end of struct",
2987 get_tok_str(v
, NULL
));
2992 type_decl(&type1
, &ad
, &v
, TYPE_DIRECT
| TYPE_ABSTRACT
);
2994 if ((type1
.t
& VT_BTYPE
) != VT_STRUCT
)
2995 expect("identifier");
2997 int v
= btype
.ref
->v
;
2998 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
2999 if (tcc_state
->ms_extensions
== 0)
3000 expect("identifier");
3004 if (type_size(&type1
, &align
) < 0) {
3005 if ((a
== TOK_STRUCT
) && (type1
.t
& VT_ARRAY
) && c
)
3008 tcc_error("field '%s' has incomplete type",
3009 get_tok_str(v
, NULL
));
3011 if ((type1
.t
& VT_BTYPE
) == VT_FUNC
||
3012 (type1
.t
& (VT_TYPEDEF
| VT_STATIC
| VT_EXTERN
| VT_INLINE
)))
3013 tcc_error("invalid type for '%s'",
3014 get_tok_str(v
, NULL
));
3018 bit_size
= expr_const();
3019 /* XXX: handle v = 0 case for messages */
3021 tcc_error("negative width in bit-field '%s'",
3022 get_tok_str(v
, NULL
));
3023 if (v
&& bit_size
== 0)
3024 tcc_error("zero width for bit-field '%s'",
3025 get_tok_str(v
, NULL
));
3027 size
= type_size(&type1
, &align
);
3029 if (align
< ad
.a
.aligned
)
3030 align
= ad
.a
.aligned
;
3031 } else if (ad
.a
.packed
) {
3033 } else if (*tcc_state
->pack_stack_ptr
) {
3034 if (align
> *tcc_state
->pack_stack_ptr
)
3035 align
= *tcc_state
->pack_stack_ptr
;
3038 if (bit_size
>= 0) {
3039 bt
= type1
.t
& VT_BTYPE
;
3046 tcc_error("bitfields must have scalar type");
3048 if (bit_size
> bsize
) {
3049 tcc_error("width of '%s' exceeds its type",
3050 get_tok_str(v
, NULL
));
3051 } else if (bit_size
== bsize
) {
3052 /* no need for bit fields */
3054 } else if (bit_size
== 0) {
3055 /* XXX: what to do if only padding in a
3057 /* zero size: means to pad */
3060 /* we do not have enough room ?
3061 did the type change?
3063 if ((bit_pos
+ bit_size
) > bsize
||
3064 bt
!= prevbt
|| a
== TOK_UNION
)
3067 /* XXX: handle LSB first */
3068 type1
.t
|= VT_BITFIELD
|
3069 (bit_pos
<< VT_STRUCT_SHIFT
) |
3070 (bit_size
<< (VT_STRUCT_SHIFT
+ 6));
3071 bit_pos
+= bit_size
;
3077 if (v
!= 0 || (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
3078 /* add new memory data only if starting
3080 if (lbit_pos
== 0) {
3081 if (a
== TOK_STRUCT
) {
3082 c
= (c
+ align
- 1) & -align
;
3091 if (align
> maxalign
)
3095 printf("add field %s offset=%d",
3096 get_tok_str(v
, NULL
), offset
);
3097 if (type1
.t
& VT_BITFIELD
) {
3098 printf(" pos=%d size=%d",
3099 (type1
.t
>> VT_STRUCT_SHIFT
) & 0x3f,
3100 (type1
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f);
3105 if (v
== 0 && (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
3107 while ((ass
= ass
->next
) != NULL
) {
3108 ss
= sym_push(ass
->v
, &ass
->type
, 0, offset
+ ass
->c
);
3113 ss
= sym_push(v
| SYM_FIELD
, &type1
, 0, offset
);
3117 if (tok
== ';' || tok
== TOK_EOF
)
3124 /* store size and alignment */
3125 s
->c
= (c
+ maxalign
- 1) & -maxalign
;
3131 /* return 1 if basic type is a type size (short, long, long long) */
3132 ST_FUNC
int is_btype_size(int bt
)
3134 return bt
== VT_SHORT
|| bt
== VT_LONG
|| bt
== VT_LLONG
;
3137 /* return 0 if no type declaration. otherwise, return the basic type
3140 static int parse_btype(CType
*type
, AttributeDef
*ad
)
3142 int t
, u
, bt_size
, complete
, type_found
, typespec_found
;
3146 memset(ad
, 0, sizeof(AttributeDef
));
3154 /* currently, we really ignore extension */
3165 tcc_error("too many basic types");
3167 bt_size
= is_btype_size (u
& VT_BTYPE
);
3168 if (u
== VT_INT
|| (!bt_size
&& !(t
& VT_TYPEDEF
)))
3183 if ((t
& VT_BTYPE
) == VT_DOUBLE
) {
3184 #ifndef TCC_TARGET_PE
3185 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3187 } else if ((t
& VT_BTYPE
) == VT_LONG
) {
3188 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3194 #ifdef TCC_TARGET_ARM64
3196 /* GCC's __uint128_t appears in some Linux header files. Make it a
3197 synonym for long double to get the size and alignment right. */
3209 if ((t
& VT_BTYPE
) == VT_LONG
) {
3210 #ifdef TCC_TARGET_PE
3211 t
= (t
& ~VT_BTYPE
) | VT_DOUBLE
;
3213 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3221 struct_decl(&type1
, VT_ENUM
, t
& (VT_TYPEDEF
| VT_EXTERN
));
3224 type
->ref
= type1
.ref
;
3228 struct_decl(&type1
, VT_STRUCT
, t
& (VT_TYPEDEF
| VT_EXTERN
));
3231 /* type modifiers */
3247 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == (VT_DEFSIGN
|VT_UNSIGNED
))
3248 tcc_error("signed and unsigned modifier");
3261 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == VT_DEFSIGN
)
3262 tcc_error("signed and unsigned modifier");
3263 t
|= VT_DEFSIGN
| VT_UNSIGNED
;
3288 /* GNUC attribute */
3289 case TOK_ATTRIBUTE1
:
3290 case TOK_ATTRIBUTE2
:
3291 parse_attribute(ad
);
3294 t
= (t
& ~VT_BTYPE
) | u
;
3302 parse_expr_type(&type1
);
3303 /* remove all storage modifiers except typedef */
3304 type1
.t
&= ~(VT_STORAGE
&~VT_TYPEDEF
);
3310 if (!s
|| !(s
->type
.t
& VT_TYPEDEF
))
3312 t
|= (s
->type
.t
& ~VT_TYPEDEF
);
3313 if ((t
& VT_ARRAY
) &&
3314 t
& (VT_CONSTANT
| VT_VOLATILE
) & ~s
->type
.ref
->type
.t
) {
3315 /* This is a case like "typedef int T[1]; const T x;"
3316 in which which we must make a copy of the typedef
3317 type so that we can add the type qualifiers to it. */
3318 type
->ref
= sym_push(SYM_FIELD
, &s
->type
.ref
->type
,
3320 type
->ref
->type
.t
|= t
& (VT_CONSTANT
| VT_VOLATILE
);
3323 type
->ref
= s
->type
.ref
;
3325 /* get attributes from typedef */
3326 if (0 == ad
->a
.aligned
)
3327 ad
->a
.aligned
= s
->a
.aligned
;
3328 if (0 == ad
->a
.func_call
)
3329 ad
->a
.func_call
= s
->a
.func_call
;
3330 ad
->a
.packed
|= s
->a
.packed
;
3339 if (tcc_state
->char_is_unsigned
) {
3340 if ((t
& (VT_DEFSIGN
|VT_BTYPE
)) == VT_BYTE
)
3344 /* long is never used as type */
3345 if ((t
& VT_BTYPE
) == VT_LONG
)
3346 #if (!defined TCC_TARGET_X86_64 && !defined TCC_TARGET_ARM64) || \
3347 defined TCC_TARGET_PE
3348 t
= (t
& ~VT_BTYPE
) | VT_INT
;
3350 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3356 /* convert a function parameter type (array to pointer and function to
3357 function pointer) */
3358 static inline void convert_parameter_type(CType
*pt
)
3360 /* remove const and volatile qualifiers (XXX: const could be used
3361 to indicate a const function parameter */
3362 pt
->t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3363 /* array must be transformed to pointer according to ANSI C */
3365 if ((pt
->t
& VT_BTYPE
) == VT_FUNC
) {
3370 ST_FUNC
void parse_asm_str(CString
*astr
)
3373 /* read the string */
3375 expect("string constant");
3377 while (tok
== TOK_STR
) {
3378 /* XXX: add \0 handling too ? */
3379 cstr_cat(astr
, tokc
.str
.data
);
3382 cstr_ccat(astr
, '\0');
3385 /* Parse an asm label and return the token */
3386 static int asm_label_instr(void)
3392 parse_asm_str(&astr
);
3395 printf("asm_alias: \"%s\"\n", (char *)astr
.data
);
3397 v
= tok_alloc(astr
.data
, astr
.size
- 1)->tok
;
3402 static void post_type(CType
*type
, AttributeDef
*ad
)
3404 int n
, l
, t1
, arg_size
, align
;
3405 Sym
**plast
, *s
, *first
;
3410 /* function declaration */
3418 /* read param name and compute offset */
3419 if (l
!= FUNC_OLD
) {
3420 if (!parse_btype(&pt
, &ad1
)) {
3422 tcc_error("invalid type");
3429 if ((pt
.t
& VT_BTYPE
) == VT_VOID
&& tok
== ')')
3431 type_decl(&pt
, &ad1
, &n
, TYPE_DIRECT
| TYPE_ABSTRACT
);
3432 if ((pt
.t
& VT_BTYPE
) == VT_VOID
)
3433 tcc_error("parameter declared as void");
3434 arg_size
+= (type_size(&pt
, &align
) + PTR_SIZE
- 1) / PTR_SIZE
;
3439 expect("identifier");
3443 convert_parameter_type(&pt
);
3444 s
= sym_push(n
| SYM_FIELD
, &pt
, 0, 0);
3450 if (l
== FUNC_NEW
&& tok
== TOK_DOTS
) {
3457 /* if no parameters, then old type prototype */
3461 /* NOTE: const is ignored in returned type as it has a special
3462 meaning in gcc / C++ */
3463 type
->t
&= ~VT_CONSTANT
;
3464 /* some ancient pre-K&R C allows a function to return an array
3465 and the array brackets to be put after the arguments, such
3466 that "int c()[]" means something like "int[] c()" */
3469 skip(']'); /* only handle simple "[]" */
3472 /* we push a anonymous symbol which will contain the function prototype */
3473 ad
->a
.func_args
= arg_size
;
3474 s
= sym_push(SYM_FIELD
, type
, 0, l
);
3479 } else if (tok
== '[') {
3480 /* array definition */
3482 if (tok
== TOK_RESTRICT1
)
3487 if (!local_stack
|| nocode_wanted
)
3488 vpushi(expr_const());
3490 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3493 tcc_error("invalid array size");
3495 if (!is_integer_btype(vtop
->type
.t
& VT_BTYPE
))
3496 tcc_error("size of variable length array should be an integer");
3501 /* parse next post type */
3502 post_type(type
, ad
);
3503 if (type
->t
== VT_FUNC
)
3504 tcc_error("declaration of an array of functions");
3505 t1
|= type
->t
& VT_VLA
;
3508 loc
-= type_size(&int_type
, &align
);
3512 vla_runtime_type_size(type
, &align
);
3514 vset(&int_type
, VT_LOCAL
|VT_LVAL
, n
);
3521 /* we push an anonymous symbol which will contain the array
3523 s
= sym_push(SYM_FIELD
, type
, 0, n
);
3524 type
->t
= (t1
? VT_VLA
: VT_ARRAY
) | VT_PTR
;
3529 /* Parse a type declaration (except basic type), and return the type
3530 in 'type'. 'td' is a bitmask indicating which kind of type decl is
3531 expected. 'type' should contain the basic type. 'ad' is the
3532 attribute definition of the basic type. It can be modified by
3535 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
)
3538 CType type1
, *type2
;
3539 int qualifiers
, storage
;
3541 while (tok
== '*') {
3549 qualifiers
|= VT_CONSTANT
;
3554 qualifiers
|= VT_VOLATILE
;
3562 type
->t
|= qualifiers
;
3565 /* XXX: clarify attribute handling */
3566 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3567 parse_attribute(ad
);
3569 /* recursive type */
3570 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
3571 type1
.t
= 0; /* XXX: same as int */
3574 /* XXX: this is not correct to modify 'ad' at this point, but
3575 the syntax is not clear */
3576 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3577 parse_attribute(ad
);
3578 type_decl(&type1
, ad
, v
, td
);
3581 /* type identifier */
3582 if (tok
>= TOK_IDENT
&& (td
& TYPE_DIRECT
)) {
3586 if (!(td
& TYPE_ABSTRACT
))
3587 expect("identifier");
3591 storage
= type
->t
& VT_STORAGE
;
3592 type
->t
&= ~VT_STORAGE
;
3593 if (storage
& VT_STATIC
) {
3594 int saved_nocode_wanted
= nocode_wanted
;
3596 post_type(type
, ad
);
3597 nocode_wanted
= saved_nocode_wanted
;
3599 post_type(type
, ad
);
3601 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3602 parse_attribute(ad
);
3606 /* append type at the end of type1 */
3619 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
3620 ST_FUNC
int lvalue_type(int t
)
3625 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
3627 else if (bt
== VT_SHORT
)
3631 if (t
& VT_UNSIGNED
)
3632 r
|= VT_LVAL_UNSIGNED
;
3636 /* indirection with full error checking and bound check */
3637 ST_FUNC
void indir(void)
3639 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
) {
3640 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FUNC
)
3644 if ((vtop
->r
& VT_LVAL
) && !nocode_wanted
)
3646 vtop
->type
= *pointed_type(&vtop
->type
);
3647 /* Arrays and functions are never lvalues */
3648 if (!(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_VLA
)
3649 && (vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
3650 vtop
->r
|= lvalue_type(vtop
->type
.t
);
3651 /* if bound checking, the referenced pointer must be checked */
3652 #ifdef CONFIG_TCC_BCHECK
3653 if (tcc_state
->do_bounds_check
)
3654 vtop
->r
|= VT_MUSTBOUND
;
3659 /* pass a parameter to a function and do type checking and casting */
3660 static void gfunc_param_typed(Sym
*func
, Sym
*arg
)
3665 func_type
= func
->c
;
3666 if (func_type
== FUNC_OLD
||
3667 (func_type
== FUNC_ELLIPSIS
&& arg
== NULL
)) {
3668 /* default casting : only need to convert float to double */
3669 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
) {
3672 } else if (vtop
->type
.t
& VT_BITFIELD
) {
3673 type
.t
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
3676 } else if (arg
== NULL
) {
3677 tcc_error("too many arguments to function");
3680 type
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
3681 gen_assign_cast(&type
);
3685 /* parse an expression of the form '(type)' or '(expr)' and return its
3687 static void parse_expr_type(CType
*type
)
3693 if (parse_btype(type
, &ad
)) {
3694 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3701 static void parse_type(CType
*type
)
3706 if (!parse_btype(type
, &ad
)) {
3709 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3712 static void vpush_tokc(int t
)
3717 vsetc(&type
, VT_CONST
, &tokc
);
3720 ST_FUNC
void unary(void)
3722 int n
, t
, align
, size
, r
, sizeof_caller
;
3726 static int in_sizeof
= 0;
3728 sizeof_caller
= in_sizeof
;
3730 /* XXX: GCC 2.95.3 does not generate a table although it should be
3744 vpush_tokc(VT_INT
| VT_UNSIGNED
);
3748 vpush_tokc(VT_LLONG
);
3752 vpush_tokc(VT_LLONG
| VT_UNSIGNED
);
3756 vpush_tokc(VT_FLOAT
);
3760 vpush_tokc(VT_DOUBLE
);
3764 vpush_tokc(VT_LDOUBLE
);
3767 case TOK___FUNCTION__
:
3769 goto tok_identifier
;
3775 /* special function name identifier */
3776 len
= strlen(funcname
) + 1;
3777 /* generate char[len] type */
3782 vpush_ref(&type
, data_section
, data_section
->data_offset
, len
);
3783 ptr
= section_ptr_add(data_section
, len
);
3784 memcpy(ptr
, funcname
, len
);
3789 #ifdef TCC_TARGET_PE
3790 t
= VT_SHORT
| VT_UNSIGNED
;
3796 /* string parsing */
3799 if (tcc_state
->warn_write_strings
)
3804 memset(&ad
, 0, sizeof(AttributeDef
));
3805 decl_initializer_alloc(&type
, &ad
, VT_CONST
, 2, 0, 0);
3810 if (parse_btype(&type
, &ad
)) {
3811 type_decl(&type
, &ad
, &n
, TYPE_ABSTRACT
);
3813 /* check ISOC99 compound literal */
3815 /* data is allocated locally by default */
3820 /* all except arrays are lvalues */
3821 if (!(type
.t
& VT_ARRAY
))
3822 r
|= lvalue_type(type
.t
);
3823 memset(&ad
, 0, sizeof(AttributeDef
));
3824 decl_initializer_alloc(&type
, &ad
, r
, 1, 0, 0);
3826 if (sizeof_caller
) {
3833 } else if (tok
== '{') {
3835 tcc_error("expected constant");
3836 /* save all registers */
3838 /* statement expression : we do not accept break/continue
3839 inside as GCC does */
3840 block(NULL
, NULL
, NULL
, NULL
, 0, 1);
3855 /* functions names must be treated as function pointers,
3856 except for unary '&' and sizeof. Since we consider that
3857 functions are not lvalues, we only have to handle it
3858 there and in function calls. */
3859 /* arrays can also be used although they are not lvalues */
3860 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
&&
3861 !(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_LLOCAL
))
3863 mk_pointer(&vtop
->type
);
3869 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3871 boolean
.t
= VT_BOOL
;
3873 vtop
->c
.i
= !vtop
->c
.i
;
3874 } else if ((vtop
->r
& VT_VALMASK
) == VT_CMP
)
3878 vseti(VT_JMP
, gvtst(1, 0));
3890 if ((vtop
->type
.t
& VT_BTYPE
) == VT_PTR
)
3891 tcc_error("pointer not accepted for unary plus");
3892 /* In order to force cast, we add zero, except for floating point
3893 where we really need an noop (otherwise -0.0 will be transformed
3895 if (!is_float(vtop
->type
.t
)) {
3906 unary_type(&type
); // Perform a in_sizeof = 0;
3907 size
= type_size(&type
, &align
);
3908 if (t
== TOK_SIZEOF
) {
3909 if (!(type
.t
& VT_VLA
)) {
3911 tcc_error("sizeof applied to an incomplete type");
3914 vla_runtime_type_size(&type
, &align
);
3919 vtop
->type
.t
|= VT_UNSIGNED
;
3922 case TOK_builtin_types_compatible_p
:
3931 type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3932 type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3933 vpushi(is_compatible_types(&type1
, &type2
));
3936 case TOK_builtin_constant_p
:
3938 int saved_nocode_wanted
, res
;
3941 saved_nocode_wanted
= nocode_wanted
;
3944 res
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
3946 nocode_wanted
= saved_nocode_wanted
;
3951 case TOK_builtin_frame_address
:
3952 case TOK_builtin_return_address
:
3959 if (tok
!= TOK_CINT
) {
3960 tcc_error("%s only takes positive integers",
3961 tok1
== TOK_builtin_return_address
?
3962 "__builtin_return_address" :
3963 "__builtin_frame_address");
3965 level
= (uint32_t)tokc
.i
;
3970 vset(&type
, VT_LOCAL
, 0); /* local frame */
3972 mk_pointer(&vtop
->type
);
3973 indir(); /* -> parent frame */
3975 if (tok1
== TOK_builtin_return_address
) {
3976 // assume return address is just above frame pointer on stack
3979 mk_pointer(&vtop
->type
);
3984 #ifdef TCC_TARGET_X86_64
3985 #ifdef TCC_TARGET_PE
3986 case TOK_builtin_va_start
:
3994 if ((vtop
->r
& VT_VALMASK
) != VT_LOCAL
)
3995 tcc_error("__builtin_va_start expects a local variable");
3996 vtop
->r
&= ~(VT_LVAL
| VT_REF
);
3997 vtop
->type
= char_pointer_type
;
4002 case TOK_builtin_va_arg_types
:
4009 vpushi(classify_x86_64_va_arg(&type
));
4015 #ifdef TCC_TARGET_ARM64
4016 case TOK___va_start
: {
4018 tcc_error("statement in global scope");
4028 vtop
->type
.t
= VT_VOID
;
4031 case TOK___va_arg
: {
4034 tcc_error("statement in global scope");
4046 case TOK___arm64_clear_cache
: {
4055 vtop
->type
.t
= VT_VOID
;
4059 /* pre operations */
4070 t
= vtop
->type
.t
& VT_BTYPE
;
4072 /* In IEEE negate(x) isn't subtract(0,x), but rather
4077 else if (t
== VT_DOUBLE
)
4088 goto tok_identifier
;
4090 /* allow to take the address of a label */
4091 if (tok
< TOK_UIDENT
)
4092 expect("label identifier");
4093 s
= label_find(tok
);
4095 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
4097 if (s
->r
== LABEL_DECLARED
)
4098 s
->r
= LABEL_FORWARD
;
4101 s
->type
.t
= VT_VOID
;
4102 mk_pointer(&s
->type
);
4103 s
->type
.t
|= VT_STATIC
;
4105 vpushsym(&s
->type
, s
);
4109 // special qnan , snan and infinity values
4111 vpush64(VT_DOUBLE
, 0x7ff8000000000000ULL
);
4115 vpush64(VT_DOUBLE
, 0x7ff0000000000001ULL
);
4119 vpush64(VT_DOUBLE
, 0x7ff0000000000000ULL
);
4128 expect("identifier");
4131 const char *name
= get_tok_str(t
, NULL
);
4133 tcc_error("'%s' undeclared", name
);
4134 /* for simple function calls, we tolerate undeclared
4135 external reference to int() function */
4136 if (tcc_state
->warn_implicit_function_declaration
4137 #ifdef TCC_TARGET_PE
4138 /* people must be warned about using undeclared WINAPI functions
4139 (which usually start with uppercase letter) */
4140 || (name
[0] >= 'A' && name
[0] <= 'Z')
4143 tcc_warning("implicit declaration of function '%s'", name
);
4144 s
= external_global_sym(t
, &func_old_type
, 0);
4146 if ((s
->type
.t
& (VT_STATIC
| VT_INLINE
| VT_BTYPE
)) ==
4147 (VT_STATIC
| VT_INLINE
| VT_FUNC
)) {
4148 /* if referencing an inline function, then we generate a
4149 symbol to it if not already done. It will have the
4150 effect to generate code for it at the end of the
4151 compilation unit. Inline function as always
4152 generated in the text section. */
4154 put_extern_sym(s
, text_section
, 0, 0);
4155 r
= VT_SYM
| VT_CONST
;
4159 vset(&s
->type
, r
, s
->c
);
4160 /* if forward reference, we must point to s */
4161 if (vtop
->r
& VT_SYM
) {
4168 /* post operations */
4170 if (tok
== TOK_INC
|| tok
== TOK_DEC
) {
4173 } else if (tok
== '.' || tok
== TOK_ARROW
|| tok
== TOK_CDOUBLE
) {
4176 if (tok
== TOK_ARROW
)
4178 qualifiers
= vtop
->type
.t
& (VT_CONSTANT
| VT_VOLATILE
);
4181 /* expect pointer on structure */
4182 if ((vtop
->type
.t
& VT_BTYPE
) != VT_STRUCT
)
4183 expect("struct or union");
4184 if (tok
== TOK_CDOUBLE
)
4185 expect("field name");
4187 if (tok
== TOK_CINT
|| tok
== TOK_CUINT
)
4188 expect("field name");
4192 while ((s
= s
->next
) != NULL
) {
4197 tcc_error("field not found: %s", get_tok_str(tok
& ~SYM_FIELD
, &tokc
));
4198 /* add field offset to pointer */
4199 vtop
->type
= char_pointer_type
; /* change type to 'char *' */
4202 /* change type to field type, and set to lvalue */
4203 vtop
->type
= s
->type
;
4204 vtop
->type
.t
|= qualifiers
;
4205 /* an array is never an lvalue */
4206 if (!(vtop
->type
.t
& VT_ARRAY
)) {
4207 vtop
->r
|= lvalue_type(vtop
->type
.t
);
4208 #ifdef CONFIG_TCC_BCHECK
4209 /* if bound checking, the referenced pointer must be checked */
4210 if (tcc_state
->do_bounds_check
)
4211 vtop
->r
|= VT_MUSTBOUND
;
4215 } else if (tok
== '[') {
4221 } else if (tok
== '(') {
4224 int nb_args
, ret_nregs
, ret_align
, regsize
, variadic
;
4227 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
4228 /* pointer test (no array accepted) */
4229 if ((vtop
->type
.t
& (VT_BTYPE
| VT_ARRAY
)) == VT_PTR
) {
4230 vtop
->type
= *pointed_type(&vtop
->type
);
4231 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
)
4235 expect("function pointer");
4238 vtop
->r
&= ~VT_LVAL
; /* no lvalue */
4240 /* get return type */
4243 sa
= s
->next
; /* first parameter */
4246 /* compute first implicit argument if a structure is returned */
4247 if ((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
4248 variadic
= (s
->c
== FUNC_ELLIPSIS
);
4249 ret_nregs
= gfunc_sret(&s
->type
, variadic
, &ret
.type
,
4250 &ret_align
, ®size
);
4252 /* get some space for the returned structure */
4253 size
= type_size(&s
->type
, &align
);
4254 #ifdef TCC_TARGET_ARM64
4255 /* On arm64, a small struct is return in registers.
4256 It is much easier to write it to memory if we know
4257 that we are allowed to write some extra bytes, so
4258 round the allocated space up to a power of 2: */
4260 while (size
& (size
- 1))
4261 size
= (size
| (size
- 1)) + 1;
4263 loc
= (loc
- size
) & -align
;
4265 ret
.r
= VT_LOCAL
| VT_LVAL
;
4266 /* pass it as 'int' to avoid structure arg passing
4268 vseti(VT_LOCAL
, loc
);
4278 /* return in register */
4279 if (is_float(ret
.type
.t
)) {
4280 ret
.r
= reg_fret(ret
.type
.t
);
4281 #ifdef TCC_TARGET_X86_64
4282 if ((ret
.type
.t
& VT_BTYPE
) == VT_QFLOAT
)
4286 #ifndef TCC_TARGET_ARM64
4287 #ifdef TCC_TARGET_X86_64
4288 if ((ret
.type
.t
& VT_BTYPE
) == VT_QLONG
)
4290 if ((ret
.type
.t
& VT_BTYPE
) == VT_LLONG
)
4301 gfunc_param_typed(s
, sa
);
4311 tcc_error("too few arguments to function");
4313 if (!nocode_wanted
) {
4314 gfunc_call(nb_args
);
4316 vtop
-= (nb_args
+ 1);
4320 for (r
= ret
.r
+ ret_nregs
+ !ret_nregs
; r
-- > ret
.r
;) {
4321 vsetc(&ret
.type
, r
, &ret
.c
);
4322 vtop
->r2
= ret
.r2
; /* Loop only happens when r2 is VT_CONST */
4325 /* handle packed struct return */
4326 if (((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) && ret_nregs
) {
4329 size
= type_size(&s
->type
, &align
);
4330 /* We're writing whole regs often, make sure there's enough
4331 space. Assume register size is power of 2. */
4332 if (regsize
> align
)
4334 loc
= (loc
- size
) & -align
;
4338 vset(&ret
.type
, VT_LOCAL
| VT_LVAL
, addr
+ offset
);
4342 if (--ret_nregs
== 0)
4346 vset(&s
->type
, VT_LOCAL
| VT_LVAL
, addr
);
4354 ST_FUNC
void expr_prod(void)
4359 while (tok
== '*' || tok
== '/' || tok
== '%') {
4367 ST_FUNC
void expr_sum(void)
4372 while (tok
== '+' || tok
== '-') {
4380 static void expr_shift(void)
4385 while (tok
== TOK_SHL
|| tok
== TOK_SAR
) {
4393 static void expr_cmp(void)
4398 while ((tok
>= TOK_ULE
&& tok
<= TOK_GT
) ||
4399 tok
== TOK_ULT
|| tok
== TOK_UGE
) {
4407 static void expr_cmpeq(void)
4412 while (tok
== TOK_EQ
|| tok
== TOK_NE
) {
4420 static void expr_and(void)
4423 while (tok
== '&') {
4430 static void expr_xor(void)
4433 while (tok
== '^') {
4440 static void expr_or(void)
4443 while (tok
== '|') {
4450 static void expr_land(void)
4453 if (tok
== TOK_LAND
) {
4454 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
4465 int saved_nocode_wanted
= nocode_wanted
;
4469 nocode_wanted
= saved_nocode_wanted
;
4477 if (tok
!= TOK_LAND
) {
4488 static void expr_lor(void)
4491 if (tok
== TOK_LOR
) {
4492 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
4499 int saved_nocode_wanted
= nocode_wanted
;
4503 nocode_wanted
= saved_nocode_wanted
;
4515 if (tok
!= TOK_LOR
) {
4526 static void expr_cond(void)
4528 int tt
, u
, r1
, r2
, rc
, t1
, t2
, bt1
, bt2
;
4530 CType type
, type1
, type2
;
4535 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
4536 int saved_nocode_wanted
= nocode_wanted
;
4539 boolean
.t
= VT_BOOL
;
4545 if (tok
!= ':' || !gnu_ext
) {
4553 nocode_wanted
= saved_nocode_wanted
;
4556 if (tok
!= ':' || !gnu_ext
) {
4560 nocode_wanted
= saved_nocode_wanted
;
4567 if (vtop
!= vstack
) {
4568 /* needed to avoid having different registers saved in
4570 if (is_float(vtop
->type
.t
)) {
4572 #ifdef TCC_TARGET_X86_64
4573 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4583 if (tok
== ':' && gnu_ext
) {
4591 sv
= *vtop
; /* save value to handle it later */
4592 vtop
--; /* no vpop so that FP stack is not flushed */
4600 bt1
= t1
& VT_BTYPE
;
4602 bt2
= t2
& VT_BTYPE
;
4603 /* cast operands to correct type according to ISOC rules */
4604 if (is_float(bt1
) || is_float(bt2
)) {
4605 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
4606 type
.t
= VT_LDOUBLE
;
4607 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
4612 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
4613 /* cast to biggest op */
4615 /* convert to unsigned if it does not fit in a long long */
4616 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
4617 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
4618 type
.t
|= VT_UNSIGNED
;
4619 } else if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
4620 /* If one is a null ptr constant the result type
4622 if (is_null_pointer (vtop
))
4624 else if (is_null_pointer (&sv
))
4626 /* XXX: test pointer compatibility, C99 has more elaborate
4630 } else if (bt1
== VT_FUNC
|| bt2
== VT_FUNC
) {
4631 /* XXX: test function pointer compatibility */
4632 type
= bt1
== VT_FUNC
? type1
: type2
;
4633 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
4634 /* XXX: test structure compatibility */
4635 type
= bt1
== VT_STRUCT
? type1
: type2
;
4636 } else if (bt1
== VT_VOID
|| bt2
== VT_VOID
) {
4637 /* NOTE: as an extension, we accept void on only one side */
4640 /* integer operations */
4642 /* convert to unsigned if it does not fit in an integer */
4643 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
4644 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
4645 type
.t
|= VT_UNSIGNED
;
4648 /* now we convert second operand */
4650 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4653 if (is_float(type
.t
)) {
4655 #ifdef TCC_TARGET_X86_64
4656 if ((type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4660 } else if ((type
.t
& VT_BTYPE
) == VT_LLONG
) {
4661 /* for long longs, we use fixed registers to avoid having
4662 to handle a complicated move */
4667 /* this is horrible, but we must also convert first
4671 /* put again first value and cast it */
4674 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4677 move_reg(r2
, r1
, type
.t
);
4684 static void expr_eq(void)
4690 (tok
>= TOK_A_MOD
&& tok
<= TOK_A_DIV
) ||
4691 tok
== TOK_A_XOR
|| tok
== TOK_A_OR
||
4692 tok
== TOK_A_SHL
|| tok
== TOK_A_SAR
) {
4707 ST_FUNC
void gexpr(void)
4718 /* parse an expression and return its type without any side effect. */
4719 static void expr_type(CType
*type
)
4721 int saved_nocode_wanted
;
4723 saved_nocode_wanted
= nocode_wanted
;
4728 nocode_wanted
= saved_nocode_wanted
;
4731 /* parse a unary expression and return its type without any side
4733 static void unary_type(CType
*type
)
4745 /* parse a constant expression and return value in vtop. */
4746 static void expr_const1(void)
4755 /* parse an integer constant and return its value. */
4756 ST_FUNC
int expr_const(void)
4760 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
4761 expect("constant expression");
4767 /* return the label token if current token is a label, otherwise
4769 static int is_label(void)
4773 /* fast test first */
4774 if (tok
< TOK_UIDENT
)
4776 /* no need to save tokc because tok is an identifier */
4783 unget_tok(last_tok
);
4788 static void label_or_decl(int l
)
4792 /* fast test first */
4793 if (tok
>= TOK_UIDENT
)
4795 /* no need to save tokc because tok is an identifier */
4799 unget_tok(last_tok
);
4802 unget_tok(last_tok
);
4807 static void block(int *bsym
, int *csym
, int *case_sym
, int *def_sym
,
4808 int case_reg
, int is_expr
)
4811 Sym
*s
, *frame_bottom
;
4813 /* generate line number info */
4814 if (tcc_state
->do_debug
&&
4815 (last_line_num
!= file
->line_num
|| last_ind
!= ind
)) {
4816 put_stabn(N_SLINE
, 0, file
->line_num
, ind
- func_ind
);
4818 last_line_num
= file
->line_num
;
4822 /* default return value is (void) */
4824 vtop
->type
.t
= VT_VOID
;
4827 if (tok
== TOK_IF
) {
4834 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4836 if (c
== TOK_ELSE
) {
4840 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4841 gsym(d
); /* patch else jmp */
4844 } else if (tok
== TOK_WHILE
) {
4853 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4857 } else if (tok
== '{') {
4859 int block_vla_sp_loc
= vla_sp_loc
, saved_vlas_in_scope
= vlas_in_scope
;
4862 /* record local declaration stack position */
4864 frame_bottom
= sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
4865 frame_bottom
->next
= scope_stack_bottom
;
4866 scope_stack_bottom
= frame_bottom
;
4867 llabel
= local_label_stack
;
4869 /* handle local labels declarations */
4870 if (tok
== TOK_LABEL
) {
4873 if (tok
< TOK_UIDENT
)
4874 expect("label identifier");
4875 label_push(&local_label_stack
, tok
, LABEL_DECLARED
);
4885 while (tok
!= '}') {
4886 label_or_decl(VT_LOCAL
);
4890 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
4893 /* pop locally defined labels */
4894 label_pop(&local_label_stack
, llabel
);
4896 /* XXX: this solution makes only valgrind happy...
4897 triggered by gcc.c-torture/execute/20000917-1.c */
4899 switch(vtop
->type
.t
& VT_BTYPE
) {
4901 /* this breaks a compilation of the linux kernel v2.4.26 */
4902 /* pmd_t *new = ({ __asm__ __volatile__("ud2\n") ; ((pmd_t *)1); }); */
4903 /* Look a commit a80acab: Display error on statement expressions with complex return type */
4904 /* A pointer is not a complex return type */
4908 for(p
=vtop
->type
.ref
;p
;p
=p
->prev
)
4910 tcc_error("unsupported expression type");
4913 /* pop locally defined symbols */
4914 scope_stack_bottom
= scope_stack_bottom
->next
;
4915 sym_pop(&local_stack
, s
);
4917 /* Pop VLA frames and restore stack pointer if required */
4918 if (vlas_in_scope
> saved_vlas_in_scope
) {
4919 vla_sp_loc
= saved_vlas_in_scope
? block_vla_sp_loc
: vla_sp_root_loc
;
4922 vlas_in_scope
= saved_vlas_in_scope
;
4925 } else if (tok
== TOK_RETURN
) {
4929 gen_assign_cast(&func_vt
);
4930 #ifdef TCC_TARGET_ARM64
4931 // Perhaps it would be better to use this for all backends:
4934 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
4935 CType type
, ret_type
;
4936 int ret_align
, ret_nregs
, regsize
;
4937 ret_nregs
= gfunc_sret(&func_vt
, func_var
, &ret_type
,
4938 &ret_align
, ®size
);
4939 if (0 == ret_nregs
) {
4940 /* if returning structure, must copy it to implicit
4941 first pointer arg location */
4944 vset(&type
, VT_LOCAL
| VT_LVAL
, func_vc
);
4947 /* copy structure value to pointer */
4950 /* returning structure packed into registers */
4951 int r
, size
, addr
, align
;
4952 size
= type_size(&func_vt
,&align
);
4953 if ((vtop
->r
!= (VT_LOCAL
| VT_LVAL
) ||
4954 (vtop
->c
.i
& (ret_align
-1)))
4955 && (align
& (ret_align
-1))) {
4956 loc
= (loc
- size
) & -ret_align
;
4959 vset(&type
, VT_LOCAL
| VT_LVAL
, addr
);
4963 vset(&ret_type
, VT_LOCAL
| VT_LVAL
, addr
);
4965 vtop
->type
= ret_type
;
4966 if (is_float(ret_type
.t
))
4967 r
= rc_fret(ret_type
.t
);
4973 if (--ret_nregs
== 0)
4975 /* We assume that when a structure is returned in multiple
4976 registers, their classes are consecutive values of the
4979 vtop
->c
.i
+= regsize
;
4980 vtop
->r
= VT_LOCAL
| VT_LVAL
;
4983 } else if (is_float(func_vt
.t
)) {
4984 gv(rc_fret(func_vt
.t
));
4989 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
4992 rsym
= gjmp(rsym
); /* jmp */
4993 } else if (tok
== TOK_BREAK
) {
4996 tcc_error("cannot break");
4997 *bsym
= gjmp(*bsym
);
5000 } else if (tok
== TOK_CONTINUE
) {
5003 tcc_error("cannot continue");
5004 vla_sp_restore_root();
5005 *csym
= gjmp(*csym
);
5008 } else if (tok
== TOK_FOR
) {
5013 frame_bottom
= sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
5014 frame_bottom
->next
= scope_stack_bottom
;
5015 scope_stack_bottom
= frame_bottom
;
5017 /* c99 for-loop init decl? */
5018 if (!decl0(VT_LOCAL
, 1)) {
5019 /* no, regular for-loop init expr */
5045 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
5049 scope_stack_bottom
= scope_stack_bottom
->next
;
5050 sym_pop(&local_stack
, s
);
5052 if (tok
== TOK_DO
) {
5058 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
5069 if (tok
== TOK_SWITCH
) {
5073 /* XXX: other types than integer */
5074 case_reg
= gv(RC_INT
);
5078 b
= gjmp(0); /* jump to first case */
5080 block(&a
, csym
, &b
, &c
, case_reg
, 0);
5081 /* if no default, jmp after switch */
5089 if (tok
== TOK_CASE
) {
5096 if (gnu_ext
&& tok
== TOK_DOTS
) {
5100 tcc_warning("empty case range");
5102 /* since a case is like a label, we must skip it with a jmp */
5110 *case_sym
= gtst(1, 0);
5113 *case_sym
= gtst(1, 0);
5117 *case_sym
= gtst(1, *case_sym
);
5119 case_reg
= gv(RC_INT
);
5124 goto block_after_label
;
5126 if (tok
== TOK_DEFAULT
) {
5132 tcc_error("too many 'default'");
5135 goto block_after_label
;
5137 if (tok
== TOK_GOTO
) {
5139 if (tok
== '*' && gnu_ext
) {
5143 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
)
5146 } else if (tok
>= TOK_UIDENT
) {
5147 s
= label_find(tok
);
5148 /* put forward definition if needed */
5150 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
5152 if (s
->r
== LABEL_DECLARED
)
5153 s
->r
= LABEL_FORWARD
;
5155 vla_sp_restore_root();
5156 if (s
->r
& LABEL_FORWARD
)
5157 s
->jnext
= gjmp(s
->jnext
);
5159 gjmp_addr(s
->jnext
);
5162 expect("label identifier");
5165 } else if (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
) {
5173 if (s
->r
== LABEL_DEFINED
)
5174 tcc_error("duplicate label '%s'", get_tok_str(s
->v
, NULL
));
5176 s
->r
= LABEL_DEFINED
;
5178 s
= label_push(&global_label_stack
, b
, LABEL_DEFINED
);
5182 /* we accept this, but it is a mistake */
5185 tcc_warning("deprecated use of label at end of compound statement");
5189 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
5192 /* expression case */
5207 /* t is the array or struct type. c is the array or struct
5208 address. cur_index/cur_field is the pointer to the current
5209 value. 'size_only' is true if only size info is needed (only used
5211 static void decl_designator(CType
*type
, Section
*sec
, unsigned long c
,
5212 int *cur_index
, Sym
**cur_field
,
5216 int notfirst
, index
, index_last
, align
, l
, nb_elems
, elem_size
;
5222 if (gnu_ext
&& (l
= is_label()) != 0)
5224 while (tok
== '[' || tok
== '.') {
5226 if (!(type
->t
& VT_ARRAY
))
5227 expect("array type");
5230 index
= expr_const();
5231 if (index
< 0 || (s
->c
>= 0 && index
>= s
->c
))
5232 expect("invalid index");
5233 if (tok
== TOK_DOTS
&& gnu_ext
) {
5235 index_last
= expr_const();
5236 if (index_last
< 0 ||
5237 (s
->c
>= 0 && index_last
>= s
->c
) ||
5239 expect("invalid index");
5245 *cur_index
= index_last
;
5246 type
= pointed_type(type
);
5247 elem_size
= type_size(type
, &align
);
5248 c
+= index
* elem_size
;
5249 /* NOTE: we only support ranges for last designator */
5250 nb_elems
= index_last
- index
+ 1;
5251 if (nb_elems
!= 1) {
5260 if ((type
->t
& VT_BTYPE
) != VT_STRUCT
)
5261 expect("struct/union type");
5274 /* XXX: fix this mess by using explicit storage field */
5276 type1
.t
|= (type
->t
& ~VT_TYPE
);
5290 if (type
->t
& VT_ARRAY
) {
5292 type
= pointed_type(type
);
5293 c
+= index
* type_size(type
, &align
);
5297 tcc_error("too many field init");
5298 /* XXX: fix this mess by using explicit storage field */
5300 type1
.t
|= (type
->t
& ~VT_TYPE
);
5305 decl_initializer(type
, sec
, c
, 0, size_only
);
5307 /* XXX: make it more general */
5308 if (!size_only
&& nb_elems
> 1) {
5309 unsigned long c_end
;
5314 tcc_error("range init not supported yet for dynamic storage");
5315 c_end
= c
+ nb_elems
* elem_size
;
5316 if (c_end
> sec
->data_allocated
)
5317 section_realloc(sec
, c_end
);
5318 src
= sec
->data
+ c
;
5320 for(i
= 1; i
< nb_elems
; i
++) {
5322 memcpy(dst
, src
, elem_size
);
5328 #define EXPR_CONST 1
5331 /* store a value or an expression directly in global data or in local array */
5332 static void init_putv(CType
*type
, Section
*sec
, unsigned long c
,
5333 int v
, int expr_type
)
5335 int saved_global_expr
, bt
, bit_pos
, bit_size
;
5337 unsigned long long bit_mask
;
5345 /* compound literals must be allocated globally in this case */
5346 saved_global_expr
= global_expr
;
5349 global_expr
= saved_global_expr
;
5350 /* NOTE: symbols are accepted */
5351 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) != VT_CONST
)
5352 tcc_error("initializer element is not constant");
5360 dtype
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
5363 /* XXX: not portable */
5364 /* XXX: generate error if incorrect relocation */
5365 gen_assign_cast(&dtype
);
5366 bt
= type
->t
& VT_BTYPE
;
5367 /* we'll write at most 16 bytes */
5368 if (c
+ 16 > sec
->data_allocated
) {
5369 section_realloc(sec
, c
+ 16);
5371 ptr
= sec
->data
+ c
;
5372 /* XXX: make code faster ? */
5373 if (!(type
->t
& VT_BITFIELD
)) {
5378 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5379 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
5380 bit_mask
= (1LL << bit_size
) - 1;
5382 if ((vtop
->r
& VT_SYM
) &&
5388 (bt
== VT_INT
&& bit_size
!= 32)))
5389 tcc_error("initializer element is not computable at load time");
5391 /* XXX: when cross-compiling we assume that each type has the
5392 same representation on host and target, which is likely to
5393 be wrong in the case of long double */
5395 vtop
->c
.i
= (vtop
->c
.i
!= 0);
5397 *(char *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5400 *(short *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5403 *(double *)ptr
= vtop
->c
.d
;
5406 *(long double *)ptr
= vtop
->c
.ld
;
5409 *(long long *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5412 addr_t val
= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5413 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
5414 if (vtop
->r
& VT_SYM
)
5415 greloca(sec
, vtop
->sym
, c
, R_DATA_PTR
, val
);
5417 *(addr_t
*)ptr
|= val
;
5419 if (vtop
->r
& VT_SYM
)
5420 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
5421 *(addr_t
*)ptr
|= val
;
5426 int val
= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5427 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
5428 if (vtop
->r
& VT_SYM
)
5429 greloca(sec
, vtop
->sym
, c
, R_DATA_PTR
, val
);
5433 if (vtop
->r
& VT_SYM
)
5434 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
5442 vset(&dtype
, VT_LOCAL
|VT_LVAL
, c
);
5449 /* put zeros for variable based init */
5450 static void init_putz(CType
*t
, Section
*sec
, unsigned long c
, int size
)
5453 /* nothing to do because globals are already set to zero */
5455 vpush_global_sym(&func_old_type
, TOK_memset
);
5457 #ifdef TCC_TARGET_ARM
5468 /* 't' contains the type and storage info. 'c' is the offset of the
5469 object in section 'sec'. If 'sec' is NULL, it means stack based
5470 allocation. 'first' is true if array '{' must be read (multi
5471 dimension implicit array init handling). 'size_only' is true if
5472 size only evaluation is wanted (only for arrays). */
5473 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
,
5474 int first
, int size_only
)
5476 int index
, array_length
, n
, no_oblock
, nb
, parlevel
, parlevel1
, i
;
5477 int size1
, align1
, expr_type
;
5481 if (type
->t
& VT_VLA
) {
5484 /* save current stack pointer */
5485 if (vlas_in_scope
== 0) {
5486 if (vla_sp_root_loc
== -1)
5487 vla_sp_root_loc
= (loc
-= PTR_SIZE
);
5488 gen_vla_sp_save(vla_sp_root_loc
);
5491 vla_runtime_type_size(type
, &a
);
5492 gen_vla_alloc(type
, a
);
5496 } else if (type
->t
& VT_ARRAY
) {
5500 t1
= pointed_type(type
);
5501 size1
= type_size(t1
, &align1
);
5504 if ((first
&& tok
!= TOK_LSTR
&& tok
!= TOK_STR
) ||
5507 tcc_error("character array initializer must be a literal,"
5508 " optionally enclosed in braces");
5513 /* only parse strings here if correct type (otherwise: handle
5514 them as ((w)char *) expressions */
5515 if ((tok
== TOK_LSTR
&&
5516 #ifdef TCC_TARGET_PE
5517 (t1
->t
& VT_BTYPE
) == VT_SHORT
&& (t1
->t
& VT_UNSIGNED
)
5519 (t1
->t
& VT_BTYPE
) == VT_INT
5521 ) || (tok
== TOK_STR
&& (t1
->t
& VT_BTYPE
) == VT_BYTE
)) {
5522 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5525 /* compute maximum number of chars wanted */
5527 cstr_len
= tokc
.str
.size
;
5529 cstr_len
= tokc
.str
.size
/ sizeof(nwchar_t
);
5532 if (n
>= 0 && nb
> (n
- array_length
))
5533 nb
= n
- array_length
;
5536 tcc_warning("initializer-string for array is too long");
5537 /* in order to go faster for common case (char
5538 string in global variable, we handle it
5540 if (sec
&& tok
== TOK_STR
&& size1
== 1) {
5541 memcpy(sec
->data
+ c
+ array_length
, tokc
.str
.data
, nb
);
5545 ch
= ((unsigned char *)tokc
.str
.data
)[i
];
5547 ch
= ((nwchar_t
*)tokc
.str
.data
)[i
];
5548 init_putv(t1
, sec
, c
+ (array_length
+ i
) * size1
,
5556 /* only add trailing zero if enough storage (no
5557 warning in this case since it is standard) */
5558 if (n
< 0 || array_length
< n
) {
5560 init_putv(t1
, sec
, c
+ (array_length
* size1
), 0, EXPR_VAL
);
5566 while (tok
!= '}') {
5567 decl_designator(type
, sec
, c
, &index
, NULL
, size_only
);
5568 if (n
>= 0 && index
>= n
)
5569 tcc_error("index too large");
5570 /* must put zero in holes (note that doing it that way
5571 ensures that it even works with designators) */
5572 if (!size_only
&& array_length
< index
) {
5573 init_putz(t1
, sec
, c
+ array_length
* size1
,
5574 (index
- array_length
) * size1
);
5577 if (index
> array_length
)
5578 array_length
= index
;
5579 /* special test for multi dimensional arrays (may not
5580 be strictly correct if designators are used at the
5582 if (index
>= n
&& no_oblock
)
5591 /* put zeros at the end */
5592 if (!size_only
&& n
>= 0 && array_length
< n
) {
5593 init_putz(t1
, sec
, c
+ array_length
* size1
,
5594 (n
- array_length
) * size1
);
5596 /* patch type size if needed */
5598 s
->c
= array_length
;
5599 } else if ((type
->t
& VT_BTYPE
) == VT_STRUCT
&&
5600 (sec
|| !first
|| tok
== '{')) {
5602 /* NOTE: the previous test is a specific case for automatic
5603 struct/union init */
5604 /* XXX: union needs only one init */
5611 if (tcc_state
->old_struct_init_code
) {
5612 /* an old version of struct initialization.
5613 It have a problems. But with a new version
5614 linux 2.4.26 can't load ramdisk.
5616 while (tok
== '(') {
5620 if (!parse_btype(&type1
, &ad1
))
5622 type_decl(&type1
, &ad1
, &n
, TYPE_ABSTRACT
);
5624 if (!is_assignable_types(type
, &type1
))
5625 tcc_error("invalid type for cast");
5632 if (!parse_btype(&type1
, &ad1
))
5634 type_decl(&type1
, &ad1
, &n
, TYPE_ABSTRACT
);
5636 if (!is_assignable_types(type
, &type1
))
5637 tcc_error("invalid type for cast");
5646 if (first
|| tok
== '{') {
5655 while (tok
!= '}') {
5656 decl_designator(type
, sec
, c
, NULL
, &f
, size_only
);
5658 if (!size_only
&& array_length
< index
) {
5659 init_putz(type
, sec
, c
+ array_length
,
5660 index
- array_length
);
5662 index
= index
+ type_size(&f
->type
, &align1
);
5663 if (index
> array_length
)
5664 array_length
= index
;
5666 /* gr: skip fields from same union - ugly. */
5669 int f_size
= type_size(&f
->type
, &align
);
5670 int f_type
= (f
->type
.t
& VT_BTYPE
);
5672 ///printf("index: %2d %08x -- %2d %08x\n", f->c, f->type.t, f->next->c, f->next->type.t);
5673 /* test for same offset */
5674 if (f
->next
->c
!= f
->c
)
5676 if ((f_type
== VT_STRUCT
) && (f_size
== 0)) {
5678 Lets assume a structure of size 0 can't be a member of the union.
5679 This allow to compile the following code from a linux kernel v2.4.26
5680 typedef struct { } rwlock_t;
5686 struct fs_struct init_fs = { { (1) }, (rwlock_t) {}, 0022, };
5687 tcc-0.9.23 can succesfully compile this version of the kernel.
5688 gcc don't have problems with this code too.
5692 /* if yes, test for bitfield shift */
5693 if ((f
->type
.t
& VT_BITFIELD
) && (f
->next
->type
.t
& VT_BITFIELD
)) {
5694 int bit_pos_1
= (f
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5695 int bit_pos_2
= (f
->next
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5696 //printf("bitfield %d %d\n", bit_pos_1, bit_pos_2);
5697 if (bit_pos_1
!= bit_pos_2
)
5704 if (no_oblock
&& f
== NULL
)
5710 /* put zeros at the end */
5711 if (!size_only
&& array_length
< n
) {
5712 init_putz(type
, sec
, c
+ array_length
,
5721 } else if (tok
== '{') {
5723 decl_initializer(type
, sec
, c
, first
, size_only
);
5725 } else if (size_only
) {
5726 /* just skip expression */
5727 parlevel
= parlevel1
= 0;
5728 while ((parlevel
> 0 || parlevel1
> 0 ||
5729 (tok
!= '}' && tok
!= ',')) && tok
!= -1) {
5732 else if (tok
== ')') {
5733 if (parlevel
== 0 && parlevel1
== 0)
5737 else if (tok
== '{')
5739 else if (tok
== '}') {
5740 if (parlevel
== 0 && parlevel1
== 0)
5747 /* currently, we always use constant expression for globals
5748 (may change for scripting case) */
5749 expr_type
= EXPR_CONST
;
5751 expr_type
= EXPR_ANY
;
5752 init_putv(type
, sec
, c
, 0, expr_type
);
5756 /* parse an initializer for type 't' if 'has_init' is non zero, and
5757 allocate space in local or global data space ('r' is either
5758 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
5759 variable 'v' of scope 'scope' is declared before initializers
5760 are parsed. If 'v' is zero, then a reference to the new object
5761 is put in the value stack. If 'has_init' is 2, a special parsing
5762 is done to handle string constants. */
5763 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
,
5764 int has_init
, int v
, int scope
)
5766 int size
, align
, addr
, data_offset
;
5768 ParseState saved_parse_state
= {0};
5769 TokenString init_str
;
5771 Sym
*flexible_array
;
5773 flexible_array
= NULL
;
5774 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
5775 Sym
*field
= type
->ref
->next
;
5778 field
= field
->next
;
5779 if (field
->type
.t
& VT_ARRAY
&& field
->type
.ref
->c
< 0)
5780 flexible_array
= field
;
5784 size
= type_size(type
, &align
);
5785 /* If unknown size, we must evaluate it before
5786 evaluating initializers because
5787 initializers can generate global data too
5788 (e.g. string pointers or ISOC99 compound
5789 literals). It also simplifies local
5790 initializers handling */
5791 tok_str_new(&init_str
);
5792 if (size
< 0 || (flexible_array
&& has_init
)) {
5794 tcc_error("unknown type size");
5795 /* get all init string */
5796 if (has_init
== 2) {
5797 /* only get strings */
5798 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5799 tok_str_add_tok(&init_str
);
5804 while (level
> 0 || (tok
!= ',' && tok
!= ';')) {
5806 tcc_error("unexpected end of file in initializer");
5807 tok_str_add_tok(&init_str
);
5810 else if (tok
== '}') {
5820 tok_str_add(&init_str
, -1);
5821 tok_str_add(&init_str
, 0);
5824 save_parse_state(&saved_parse_state
);
5826 begin_macro(&init_str
, 0);
5828 decl_initializer(type
, NULL
, 0, 1, 1);
5829 /* prepare second initializer parsing */
5830 macro_ptr
= init_str
.str
;
5833 /* if still unknown size, error */
5834 size
= type_size(type
, &align
);
5836 tcc_error("unknown type size");
5839 size
+= flexible_array
->type
.ref
->c
* pointed_size(&flexible_array
->type
);
5840 /* take into account specified alignment if bigger */
5841 if (ad
->a
.aligned
) {
5842 if (ad
->a
.aligned
> align
)
5843 align
= ad
->a
.aligned
;
5844 } else if (ad
->a
.packed
) {
5847 if ((r
& VT_VALMASK
) == VT_LOCAL
) {
5849 #ifdef CONFIG_TCC_BCHECK
5850 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5854 loc
= (loc
- size
) & -align
;
5856 #ifdef CONFIG_TCC_BCHECK
5857 /* handles bounds */
5858 /* XXX: currently, since we do only one pass, we cannot track
5859 '&' operators, so we add only arrays */
5860 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5862 /* add padding between regions */
5864 /* then add local bound info */
5865 bounds_ptr
= section_ptr_add(lbounds_section
, 2 * sizeof(addr_t
));
5866 bounds_ptr
[0] = addr
;
5867 bounds_ptr
[1] = size
;
5871 /* local variable */
5872 sym_push(v
, type
, r
, addr
);
5874 /* push local reference */
5875 vset(type
, r
, addr
);
5881 if (v
&& scope
== VT_CONST
) {
5882 /* see if the symbol was already defined */
5885 if (!is_compatible_types(&sym
->type
, type
))
5886 tcc_error("incompatible types for redefinition of '%s'",
5887 get_tok_str(v
, NULL
));
5888 if (sym
->type
.t
& VT_EXTERN
) {
5889 /* if the variable is extern, it was not allocated */
5890 sym
->type
.t
&= ~VT_EXTERN
;
5891 /* set array size if it was omitted in extern
5893 if ((sym
->type
.t
& VT_ARRAY
) &&
5894 sym
->type
.ref
->c
< 0 &&
5896 sym
->type
.ref
->c
= type
->ref
->c
;
5898 /* we accept several definitions of the same
5899 global variable. this is tricky, because we
5900 must play with the SHN_COMMON type of the symbol */
5901 /* XXX: should check if the variable was already
5902 initialized. It is incorrect to initialized it
5904 /* no init data, we won't add more to the symbol */
5911 /* allocate symbol in corresponding section */
5916 else if (tcc_state
->nocommon
)
5920 data_offset
= sec
->data_offset
;
5921 data_offset
= (data_offset
+ align
- 1) & -align
;
5923 /* very important to increment global pointer at this time
5924 because initializers themselves can create new initializers */
5925 data_offset
+= size
;
5926 #ifdef CONFIG_TCC_BCHECK
5927 /* add padding if bound check */
5928 if (tcc_state
->do_bounds_check
)
5931 sec
->data_offset
= data_offset
;
5932 /* allocate section space to put the data */
5933 if (sec
->sh_type
!= SHT_NOBITS
&&
5934 data_offset
> sec
->data_allocated
)
5935 section_realloc(sec
, data_offset
);
5936 /* align section if needed */
5937 if (align
> sec
->sh_addralign
)
5938 sec
->sh_addralign
= align
;
5940 addr
= 0; /* avoid warning */
5944 if (scope
!= VT_CONST
|| !sym
) {
5945 sym
= sym_push(v
, type
, r
| VT_SYM
, 0);
5946 sym
->asm_label
= ad
->asm_label
;
5948 /* update symbol definition */
5950 put_extern_sym(sym
, sec
, addr
, size
);
5953 /* put a common area */
5954 put_extern_sym(sym
, NULL
, align
, size
);
5955 /* XXX: find a nicer way */
5956 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
5957 esym
->st_shndx
= SHN_COMMON
;
5960 /* push global reference */
5961 sym
= get_sym_ref(type
, sec
, addr
, size
);
5962 vpushsym(type
, sym
);
5964 /* patch symbol weakness */
5965 if (type
->t
& VT_WEAK
)
5967 apply_visibility(sym
, type
);
5968 #ifdef CONFIG_TCC_BCHECK
5969 /* handles bounds now because the symbol must be defined
5970 before for the relocation */
5971 if (tcc_state
->do_bounds_check
) {
5974 greloc(bounds_section
, sym
, bounds_section
->data_offset
, R_DATA_PTR
);
5975 /* then add global bound info */
5976 bounds_ptr
= section_ptr_add(bounds_section
, 2 * sizeof(addr_t
));
5977 bounds_ptr
[0] = 0; /* relocated */
5978 bounds_ptr
[1] = size
;
5982 if (has_init
|| (type
->t
& VT_VLA
)) {
5983 decl_initializer(type
, sec
, addr
, 1, 0);
5984 /* restore parse state if needed */
5987 restore_parse_state(&saved_parse_state
);
5989 /* patch flexible array member size back to -1, */
5990 /* for possible subsequent similar declarations */
5992 flexible_array
->type
.ref
->c
= -1;
5997 static void put_func_debug(Sym
*sym
)
6002 /* XXX: we put here a dummy type */
6003 snprintf(buf
, sizeof(buf
), "%s:%c1",
6004 funcname
, sym
->type
.t
& VT_STATIC
? 'f' : 'F');
6005 put_stabs_r(buf
, N_FUN
, 0, file
->line_num
, 0,
6006 cur_text_section
, sym
->c
);
6007 /* //gr gdb wants a line at the function */
6008 put_stabn(N_SLINE
, 0, file
->line_num
, 0);
6013 /* parse an old style function declaration list */
6014 /* XXX: check multiple parameter */
6015 static void func_decl_list(Sym
*func_sym
)
6022 /* parse each declaration */
6023 while (tok
!= '{' && tok
!= ';' && tok
!= ',' && tok
!= TOK_EOF
&&
6024 tok
!= TOK_ASM1
&& tok
!= TOK_ASM2
&& tok
!= TOK_ASM3
) {
6025 if (!parse_btype(&btype
, &ad
))
6026 expect("declaration list");
6027 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
6028 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
6030 /* we accept no variable after */
6034 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
6035 /* find parameter in function parameter list */
6038 if ((s
->v
& ~SYM_FIELD
) == v
)
6042 tcc_error("declaration for parameter '%s' but no such parameter",
6043 get_tok_str(v
, NULL
));
6045 /* check that no storage specifier except 'register' was given */
6046 if (type
.t
& VT_STORAGE
)
6047 tcc_error("storage class specified for '%s'", get_tok_str(v
, NULL
));
6048 convert_parameter_type(&type
);
6049 /* we can add the type (NOTE: it could be local to the function) */
6051 /* accept other parameters */
6062 /* parse a function defined by symbol 'sym' and generate its code in
6063 'cur_text_section' */
6064 static void gen_function(Sym
*sym
)
6066 int saved_nocode_wanted
= nocode_wanted
;
6069 ind
= cur_text_section
->data_offset
;
6070 /* NOTE: we patch the symbol size later */
6071 put_extern_sym(sym
, cur_text_section
, ind
, 0);
6072 funcname
= get_tok_str(sym
->v
, NULL
);
6074 /* Initialize VLA state */
6076 vla_sp_root_loc
= -1;
6077 /* put debug symbol */
6078 if (tcc_state
->do_debug
)
6079 put_func_debug(sym
);
6080 /* push a dummy symbol to enable local sym storage */
6081 sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
6082 gfunc_prolog(&sym
->type
);
6083 #ifdef CONFIG_TCC_BCHECK
6084 if (tcc_state
->do_bounds_check
&& !strcmp(funcname
, "main")) {
6087 for (i
= 0, sym
= local_stack
; i
< 2; i
++, sym
= sym
->prev
) {
6088 if (sym
->v
& SYM_FIELD
|| sym
->prev
->v
& SYM_FIELD
)
6090 vpush_global_sym(&func_old_type
, TOK___bound_main_arg
);
6091 vset(&sym
->type
, sym
->r
, sym
->c
);
6097 block(NULL
, NULL
, NULL
, NULL
, 0, 0);
6100 cur_text_section
->data_offset
= ind
;
6101 label_pop(&global_label_stack
, NULL
);
6102 /* reset local stack */
6103 scope_stack_bottom
= NULL
;
6104 sym_pop(&local_stack
, NULL
);
6105 /* end of function */
6106 /* patch symbol size */
6107 ((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
].st_size
=
6109 /* patch symbol weakness (this definition overrules any prototype) */
6110 if (sym
->type
.t
& VT_WEAK
)
6112 apply_visibility(sym
, &sym
->type
);
6113 if (tcc_state
->do_debug
) {
6114 put_stabn(N_FUN
, 0, 0, ind
- func_ind
);
6116 /* It's better to crash than to generate wrong code */
6117 cur_text_section
= NULL
;
6118 funcname
= ""; /* for safety */
6119 func_vt
.t
= VT_VOID
; /* for safety */
6120 func_var
= 0; /* for safety */
6121 ind
= 0; /* for safety */
6122 nocode_wanted
= saved_nocode_wanted
;
6126 ST_FUNC
void gen_inline_functions(void)
6129 int inline_generated
, i
, ln
;
6130 struct InlineFunc
*fn
;
6132 ln
= file
->line_num
;
6133 /* iterate while inline function are referenced */
6135 inline_generated
= 0;
6136 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
6137 fn
= tcc_state
->inline_fns
[i
];
6139 if (sym
&& sym
->c
) {
6140 /* the function was used: generate its code and
6141 convert it to a normal function */
6144 pstrcpy(file
->filename
, sizeof file
->filename
, fn
->filename
);
6145 sym
->r
= VT_SYM
| VT_CONST
;
6146 sym
->type
.t
&= ~VT_INLINE
;
6148 begin_macro(&fn
->func_str
, 0);
6150 cur_text_section
= text_section
;
6154 inline_generated
= 1;
6157 if (!inline_generated
)
6160 file
->line_num
= ln
;
6161 /* free tokens of unused inline functions */
6162 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
6163 fn
= tcc_state
->inline_fns
[i
];
6165 tok_str_free(fn
->func_str
.str
);
6167 dynarray_reset(&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
);
6170 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
6171 static int decl0(int l
, int is_for_loop_init
)
6179 if (!parse_btype(&btype
, &ad
)) {
6180 if (is_for_loop_init
)
6182 /* skip redundant ';' */
6183 /* XXX: find more elegant solution */
6188 if (l
== VT_CONST
&&
6189 (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
6190 /* global asm block */
6194 /* special test for old K&R protos without explicit int
6195 type. Only accepted when defining global data */
6196 if (l
== VT_LOCAL
|| tok
< TOK_DEFINE
)
6200 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
6201 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
6203 if ((btype
.t
& VT_BTYPE
) == VT_STRUCT
) {
6204 int v
= btype
.ref
->v
;
6205 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) >= SYM_FIRST_ANOM
)
6206 tcc_warning("unnamed struct/union that defines no instances");
6211 while (1) { /* iterate thru each declaration */
6213 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
6217 type_to_str(buf
, sizeof(buf
), t
, get_tok_str(v
, NULL
));
6218 printf("type = '%s'\n", buf
);
6221 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
6222 if ((type
.t
& VT_STATIC
) && (l
== VT_LOCAL
)) {
6223 tcc_error("function without file scope cannot be static");
6225 /* if old style function prototype, we accept a
6228 if (sym
->c
== FUNC_OLD
)
6229 func_decl_list(sym
);
6232 if (gnu_ext
&& (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
6233 ad
.asm_label
= asm_label_instr();
6234 /* parse one last attribute list, after asm label */
6235 parse_attribute(&ad
);
6242 #ifdef TCC_TARGET_PE
6243 if (ad
.a
.func_import
)
6244 type
.t
|= VT_IMPORT
;
6245 if (ad
.a
.func_export
)
6246 type
.t
|= VT_EXPORT
;
6248 type
.t
|= ad
.a
.visibility
<< VT_VIS_SHIFT
;
6252 tcc_error("cannot use local functions");
6253 if ((type
.t
& VT_BTYPE
) != VT_FUNC
)
6254 expect("function definition");
6256 /* reject abstract declarators in function definition */
6258 while ((sym
= sym
->next
) != NULL
)
6259 if (!(sym
->v
& ~SYM_FIELD
))
6260 expect("identifier");
6262 /* XXX: cannot do better now: convert extern line to static inline */
6263 if ((type
.t
& (VT_EXTERN
| VT_INLINE
)) == (VT_EXTERN
| VT_INLINE
))
6264 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
6269 if ((sym
->type
.t
& VT_BTYPE
) != VT_FUNC
)
6272 ref
= sym
->type
.ref
;
6273 if (0 == ref
->a
.func_proto
)
6274 tcc_error("redefinition of '%s'", get_tok_str(v
, NULL
));
6276 /* use func_call from prototype if not defined */
6277 if (ref
->a
.func_call
!= FUNC_CDECL
6278 && type
.ref
->a
.func_call
== FUNC_CDECL
)
6279 type
.ref
->a
.func_call
= ref
->a
.func_call
;
6281 /* use export from prototype */
6282 if (ref
->a
.func_export
)
6283 type
.ref
->a
.func_export
= 1;
6285 /* use static from prototype */
6286 if (sym
->type
.t
& VT_STATIC
)
6287 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
6289 /* If the definition has no visibility use the
6290 one from prototype. */
6291 if (! (type
.t
& VT_VIS_MASK
))
6292 type
.t
|= sym
->type
.t
& VT_VIS_MASK
;
6294 if (!is_compatible_types(&sym
->type
, &type
)) {
6296 tcc_error("incompatible types for redefinition of '%s'",
6297 get_tok_str(v
, NULL
));
6299 type
.ref
->a
.func_proto
= 0;
6300 /* if symbol is already defined, then put complete type */
6303 /* put function symbol */
6304 sym
= global_identifier_push(v
, type
.t
, 0);
6305 sym
->type
.ref
= type
.ref
;
6308 /* static inline functions are just recorded as a kind
6309 of macro. Their code will be emitted at the end of
6310 the compilation unit only if they are used */
6311 if ((type
.t
& (VT_INLINE
| VT_STATIC
)) ==
6312 (VT_INLINE
| VT_STATIC
)) {
6314 struct InlineFunc
*fn
;
6315 const char *filename
;
6317 filename
= file
? file
->filename
: "";
6318 fn
= tcc_malloc(sizeof *fn
+ strlen(filename
));
6319 strcpy(fn
->filename
, filename
);
6321 tok_str_new(&fn
->func_str
);
6327 tcc_error("unexpected end of file");
6328 tok_str_add_tok(&fn
->func_str
);
6333 } else if (t
== '}') {
6335 if (block_level
== 0)
6339 tok_str_add(&fn
->func_str
, -1);
6340 tok_str_add(&fn
->func_str
, 0);
6341 dynarray_add((void ***)&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
, fn
);
6344 /* compute text section */
6345 cur_text_section
= ad
.section
;
6346 if (!cur_text_section
)
6347 cur_text_section
= text_section
;
6348 sym
->r
= VT_SYM
| VT_CONST
;
6353 if (btype
.t
& VT_TYPEDEF
) {
6354 /* save typedefed type */
6355 /* XXX: test storage specifiers ? */
6356 sym
= sym_push(v
, &type
, 0, 0);
6358 sym
->type
.t
|= VT_TYPEDEF
;
6361 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
6362 /* external function definition */
6363 /* specific case for func_call attribute */
6364 ad
.a
.func_proto
= 1;
6366 } else if (!(type
.t
& VT_ARRAY
)) {
6367 /* not lvalue if array */
6368 r
|= lvalue_type(type
.t
);
6370 has_init
= (tok
== '=');
6371 if (has_init
&& (type
.t
& VT_VLA
))
6372 tcc_error("Variable length array cannot be initialized");
6373 if ((btype
.t
& VT_EXTERN
) || ((type
.t
& VT_BTYPE
) == VT_FUNC
) ||
6374 ((type
.t
& VT_ARRAY
) && (type
.t
& VT_STATIC
) &&
6375 !has_init
&& l
== VT_CONST
&& type
.ref
->c
< 0)) {
6376 /* external variable or function */
6377 /* NOTE: as GCC, uninitialized global static
6378 arrays of null size are considered as
6380 sym
= external_sym(v
, &type
, r
);
6381 sym
->asm_label
= ad
.asm_label
;
6383 if (ad
.alias_target
) {
6388 alias_target
= sym_find(ad
.alias_target
);
6389 if (!alias_target
|| !alias_target
->c
)
6390 tcc_error("unsupported forward __alias__ attribute");
6391 esym
= &((Elf32_Sym
*)symtab_section
->data
)[alias_target
->c
];
6392 tsec
.sh_num
= esym
->st_shndx
;
6393 put_extern_sym2(sym
, &tsec
, esym
->st_value
, esym
->st_size
, 0);
6396 type
.t
|= (btype
.t
& VT_STATIC
); /* Retain "static". */
6397 if (type
.t
& VT_STATIC
)
6403 decl_initializer_alloc(&type
, &ad
, r
, has_init
, v
, l
);
6407 if (is_for_loop_init
)
6420 ST_FUNC
void decl(int l
)