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
;
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
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
, char *asm_label
, 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 /* ------------------------------------------------------------------------- */
122 /* symbol allocator */
123 static Sym
*__sym_malloc(void)
125 Sym
*sym_pool
, *sym
, *last_sym
;
128 sym_pool
= tcc_malloc(SYM_POOL_NB
* sizeof(Sym
));
129 dynarray_add(&sym_pools
, &nb_sym_pools
, sym_pool
);
131 last_sym
= sym_free_first
;
133 for(i
= 0; i
< SYM_POOL_NB
; i
++) {
134 sym
->next
= last_sym
;
138 sym_free_first
= last_sym
;
142 static inline Sym
*sym_malloc(void)
145 sym
= sym_free_first
;
147 sym
= __sym_malloc();
148 sym_free_first
= sym
->next
;
152 ST_INLN
void sym_free(Sym
*sym
)
154 sym
->next
= sym_free_first
;
155 tcc_free(sym
->asm_label
);
156 sym_free_first
= sym
;
159 /* push, without hashing */
160 ST_FUNC Sym
*sym_push2(Sym
**ps
, int v
, int t
, long c
)
163 if (ps
== &local_stack
) {
164 for (s
= *ps
; s
&& s
!= scope_stack_bottom
; s
= s
->prev
)
165 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
&& s
->v
== v
)
166 tcc_error("incompatible types for redefinition of '%s'",
167 get_tok_str(v
, NULL
));
185 /* find a symbol and return its associated structure. 's' is the top
186 of the symbol stack */
187 ST_FUNC Sym
*sym_find2(Sym
*s
, int v
)
199 /* structure lookup */
200 ST_INLN Sym
*struct_find(int v
)
203 if ((unsigned)v
>= (unsigned)(tok_ident
- TOK_IDENT
))
205 return table_ident
[v
]->sym_struct
;
208 /* find an identifier */
209 ST_INLN Sym
*sym_find(int v
)
212 if ((unsigned)v
>= (unsigned)(tok_ident
- TOK_IDENT
))
214 return table_ident
[v
]->sym_identifier
;
217 /* push a given symbol on the symbol stack */
218 ST_FUNC Sym
*sym_push(int v
, CType
*type
, int r
, int c
)
227 s
= sym_push2(ps
, v
, type
->t
, c
);
228 s
->type
.ref
= type
->ref
;
230 /* don't record fields or anonymous symbols */
232 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
233 /* record symbol in token array */
234 ts
= table_ident
[(v
& ~SYM_STRUCT
) - TOK_IDENT
];
236 ps
= &ts
->sym_struct
;
238 ps
= &ts
->sym_identifier
;
245 /* push a global identifier */
246 ST_FUNC Sym
*global_identifier_push(int v
, int t
, int c
)
249 s
= sym_push2(&global_stack
, v
, t
, c
);
250 /* don't record anonymous symbol */
251 if (v
< SYM_FIRST_ANOM
) {
252 ps
= &table_ident
[v
- TOK_IDENT
]->sym_identifier
;
253 /* modify the top most local identifier, so that
254 sym_identifier will point to 's' when popped */
256 ps
= &(*ps
)->prev_tok
;
263 /* pop symbols until top reaches 'b' */
264 ST_FUNC
void sym_pop(Sym
**ptop
, Sym
*b
)
274 /* remove symbol in token array */
276 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
277 ts
= table_ident
[(v
& ~SYM_STRUCT
) - TOK_IDENT
];
279 ps
= &ts
->sym_struct
;
281 ps
= &ts
->sym_identifier
;
290 static void weaken_symbol(Sym
*sym
)
292 sym
->type
.t
|= VT_WEAK
;
297 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
298 esym_type
= ELFW(ST_TYPE
)(esym
->st_info
);
299 esym
->st_info
= ELFW(ST_INFO
)(STB_WEAK
, esym_type
);
303 static void apply_visibility(Sym
*sym
, CType
*type
)
305 int vis
= sym
->type
.t
& VT_VIS_MASK
;
306 int vis2
= type
->t
& VT_VIS_MASK
;
307 if (vis
== (STV_DEFAULT
<< VT_VIS_SHIFT
))
309 else if (vis2
== (STV_DEFAULT
<< VT_VIS_SHIFT
))
312 vis
= (vis
< vis2
) ? vis
: vis2
;
313 sym
->type
.t
&= ~VT_VIS_MASK
;
319 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
320 vis
>>= VT_VIS_SHIFT
;
321 esym
->st_other
= (esym
->st_other
& ~ELFW(ST_VISIBILITY
)(-1)) | vis
;
325 /* ------------------------------------------------------------------------- */
327 ST_FUNC
void swap(int *p
, int *q
)
335 static void vsetc(CType
*type
, int r
, CValue
*vc
)
339 if (vtop
>= vstack
+ (VSTACK_SIZE
- 1))
340 tcc_error("memory full (vstack)");
341 /* cannot let cpu flags if other instruction are generated. Also
342 avoid leaving VT_JMP anywhere except on the top of the stack
343 because it would complicate the code generator. */
344 if (vtop
>= vstack
) {
345 v
= vtop
->r
& VT_VALMASK
;
346 if (v
== VT_CMP
|| (v
& ~1) == VT_JMP
)
356 /* push constant of type "type" with useless value */
357 ST_FUNC
void vpush(CType
*type
)
360 vsetc(type
, VT_CONST
, &cval
);
363 /* push integer constant */
364 ST_FUNC
void vpushi(int v
)
368 vsetc(&int_type
, VT_CONST
, &cval
);
371 /* push a pointer sized constant */
372 static void vpushs(addr_t v
)
376 vsetc(&size_type
, VT_CONST
, &cval
);
379 /* push arbitrary 64bit constant */
380 ST_FUNC
void vpush64(int ty
, unsigned long long v
)
387 vsetc(&ctype
, VT_CONST
, &cval
);
390 /* push long long constant */
391 static inline void vpushll(long long v
)
393 vpush64(VT_LLONG
, v
);
396 /* push a symbol value of TYPE */
397 static inline void vpushsym(CType
*type
, Sym
*sym
)
401 vsetc(type
, VT_CONST
| VT_SYM
, &cval
);
405 /* Return a static symbol pointing to a section */
406 ST_FUNC Sym
*get_sym_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
412 sym
= global_identifier_push(v
, type
->t
| VT_STATIC
, 0);
413 sym
->type
.ref
= type
->ref
;
414 sym
->r
= VT_CONST
| VT_SYM
;
415 put_extern_sym(sym
, sec
, offset
, size
);
419 /* push a reference to a section offset by adding a dummy symbol */
420 static void vpush_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
422 vpushsym(type
, get_sym_ref(type
, sec
, offset
, size
));
425 /* define a new external reference to a symbol 'v' of type 'u' */
426 ST_FUNC Sym
*external_global_sym(int v
, CType
*type
, int r
)
432 /* push forward reference */
433 s
= global_identifier_push(v
, type
->t
| VT_EXTERN
, 0);
434 s
->type
.ref
= type
->ref
;
435 s
->r
= r
| VT_CONST
| VT_SYM
;
440 /* define a new external reference to a symbol 'v' with alternate asm
441 name 'asm_label' of type 'u'. 'asm_label' is equal to NULL if there
442 is no alternate name (most cases) */
443 static Sym
*external_sym(int v
, CType
*type
, int r
, char *asm_label
)
449 /* push forward reference */
450 s
= sym_push(v
, type
, r
| VT_CONST
| VT_SYM
, 0);
451 s
->asm_label
= asm_label
;
452 s
->type
.t
|= VT_EXTERN
;
453 } else if (s
->type
.ref
== func_old_type
.ref
) {
454 s
->type
.ref
= type
->ref
;
455 s
->r
= r
| VT_CONST
| VT_SYM
;
456 s
->type
.t
|= VT_EXTERN
;
457 } else if (!is_compatible_types(&s
->type
, type
)) {
458 tcc_error("incompatible types for redefinition of '%s'",
459 get_tok_str(v
, NULL
));
461 /* Merge some storage attributes. */
462 if (type
->t
& VT_WEAK
)
465 if (type
->t
& VT_VIS_MASK
)
466 apply_visibility(s
, type
);
471 /* push a reference to global symbol v */
472 ST_FUNC
void vpush_global_sym(CType
*type
, int v
)
474 vpushsym(type
, external_global_sym(v
, type
, 0));
477 ST_FUNC
void vset(CType
*type
, int r
, int v
)
482 vsetc(type
, r
, &cval
);
485 static void vseti(int r
, int v
)
493 ST_FUNC
void vswap(void)
496 /* cannot let cpu flags if other instruction are generated. Also
497 avoid leaving VT_JMP anywhere except on the top of the stack
498 because it would complicate the code generator. */
499 if (vtop
>= vstack
) {
500 int v
= vtop
->r
& VT_VALMASK
;
501 if (v
== VT_CMP
|| (v
& ~1) == VT_JMP
)
508 /* XXX: +2% overall speed possible with optimized memswap
510 * memswap(&vtop[0], &vtop[1], sizeof *vtop);
514 ST_FUNC
void vpushv(SValue
*v
)
516 if (vtop
>= vstack
+ (VSTACK_SIZE
- 1))
517 tcc_error("memory full (vstack)");
522 static void vdup(void)
527 /* save r to the memory stack, and mark it as being free */
528 ST_FUNC
void save_reg(int r
)
530 int l
, saved
, size
, align
;
534 /* modify all stack values */
537 for(p
=vstack
;p
<=vtop
;p
++) {
538 if ((p
->r
& VT_VALMASK
) == r
||
539 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& (p
->r2
& VT_VALMASK
) == r
)) {
540 /* must save value on stack if not already done */
542 /* NOTE: must reload 'r' because r might be equal to r2 */
543 r
= p
->r
& VT_VALMASK
;
544 /* store register in the stack */
546 if ((p
->r
& VT_LVAL
) ||
547 (!is_float(type
->t
) && (type
->t
& VT_BTYPE
) != VT_LLONG
))
548 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
549 type
= &char_pointer_type
;
553 size
= type_size(type
, &align
);
554 loc
= (loc
- size
) & -align
;
556 sv
.r
= VT_LOCAL
| VT_LVAL
;
559 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
560 /* x86 specific: need to pop fp register ST0 if saved */
562 o(0xd8dd); /* fstp %st(0) */
565 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
566 /* special long long case */
567 if ((type
->t
& VT_BTYPE
) == VT_LLONG
) {
575 /* mark that stack entry as being saved on the stack */
576 if (p
->r
& VT_LVAL
) {
577 /* also clear the bounded flag because the
578 relocation address of the function was stored in
580 p
->r
= (p
->r
& ~(VT_VALMASK
| VT_BOUNDED
)) | VT_LLOCAL
;
582 p
->r
= lvalue_type(p
->type
.t
) | VT_LOCAL
;
590 #ifdef TCC_TARGET_ARM
591 /* find a register of class 'rc2' with at most one reference on stack.
592 * If none, call get_reg(rc) */
593 ST_FUNC
int get_reg_ex(int rc
, int rc2
)
598 for(r
=0;r
<NB_REGS
;r
++) {
599 if (reg_classes
[r
] & rc2
) {
602 for(p
= vstack
; p
<= vtop
; p
++) {
603 if ((p
->r
& VT_VALMASK
) == r
||
604 (p
->r2
& VT_VALMASK
) == r
)
615 /* find a free register of class 'rc'. If none, save one register */
616 ST_FUNC
int get_reg(int rc
)
621 /* find a free register */
622 for(r
=0;r
<NB_REGS
;r
++) {
623 if (reg_classes
[r
] & rc
) {
624 for(p
=vstack
;p
<=vtop
;p
++) {
625 if ((p
->r
& VT_VALMASK
) == r
||
626 (p
->r2
& VT_VALMASK
) == r
)
634 /* no register left : free the first one on the stack (VERY
635 IMPORTANT to start from the bottom to ensure that we don't
636 spill registers used in gen_opi()) */
637 for(p
=vstack
;p
<=vtop
;p
++) {
638 /* look at second register (if long long) */
639 r
= p
->r2
& VT_VALMASK
;
640 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
))
642 r
= p
->r
& VT_VALMASK
;
643 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
)) {
649 /* Should never comes here */
653 /* save registers up to (vtop - n) stack entry */
654 ST_FUNC
void save_regs(int n
)
659 for(p
= vstack
;p
<= p1
; p
++) {
660 r
= p
->r
& VT_VALMASK
;
667 /* move register 's' (of type 't') to 'r', and flush previous value of r to memory
669 static void move_reg(int r
, int s
, int t
)
683 /* get address of vtop (vtop MUST BE an lvalue) */
684 ST_FUNC
void gaddrof(void)
686 if (vtop
->r
& VT_REF
&& !nocode_wanted
)
689 /* tricky: if saved lvalue, then we can go back to lvalue */
690 if ((vtop
->r
& VT_VALMASK
) == VT_LLOCAL
)
691 vtop
->r
= (vtop
->r
& ~(VT_VALMASK
| VT_LVAL_TYPE
)) | VT_LOCAL
| VT_LVAL
;
696 #ifdef CONFIG_TCC_BCHECK
697 /* generate lvalue bound code */
698 static void gbound(void)
703 vtop
->r
&= ~VT_MUSTBOUND
;
704 /* if lvalue, then use checking code before dereferencing */
705 if (vtop
->r
& VT_LVAL
) {
706 /* if not VT_BOUNDED value, then make one */
707 if (!(vtop
->r
& VT_BOUNDED
)) {
708 lval_type
= vtop
->r
& (VT_LVAL_TYPE
| VT_LVAL
);
709 /* must save type because we must set it to int to get pointer */
711 vtop
->type
.t
= VT_PTR
;
714 gen_bounded_ptr_add();
715 vtop
->r
|= lval_type
;
718 /* then check for dereferencing */
719 gen_bounded_ptr_deref();
724 /* store vtop a register belonging to class 'rc'. lvalues are
725 converted to values. Cannot be used if cannot be converted to
726 register value (such as structures). */
727 ST_FUNC
int gv(int rc
)
729 int r
, bit_pos
, bit_size
, size
, align
, i
;
732 /* NOTE: get_reg can modify vstack[] */
733 if (vtop
->type
.t
& VT_BITFIELD
) {
736 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
737 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
738 /* remove bit field info to avoid loops */
739 vtop
->type
.t
&= ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
));
740 /* cast to int to propagate signedness in following ops */
741 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
746 if((vtop
->type
.t
& VT_UNSIGNED
) ||
747 (vtop
->type
.t
& VT_BTYPE
) == VT_BOOL
)
748 type
.t
|= VT_UNSIGNED
;
750 /* generate shifts */
751 vpushi(bits
- (bit_pos
+ bit_size
));
753 vpushi(bits
- bit_size
);
754 /* NOTE: transformed to SHR if unsigned */
758 if (is_float(vtop
->type
.t
) &&
759 (vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
762 unsigned long offset
;
763 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
767 /* XXX: unify with initializers handling ? */
768 /* CPUs usually cannot use float constants, so we store them
769 generically in data segment */
770 size
= type_size(&vtop
->type
, &align
);
771 offset
= (data_section
->data_offset
+ align
- 1) & -align
;
772 data_section
->data_offset
= offset
;
773 /* XXX: not portable yet */
774 #if defined(__i386__) || defined(__x86_64__)
775 /* Zero pad x87 tenbyte long doubles */
776 if (size
== LDOUBLE_SIZE
) {
777 vtop
->c
.tab
[2] &= 0xffff;
778 #if LDOUBLE_SIZE == 16
783 ptr
= section_ptr_add(data_section
, size
);
785 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
789 ptr
[i
] = vtop
->c
.tab
[size
-1-i
];
793 ptr
[i
] = vtop
->c
.tab
[i
];
794 sym
= get_sym_ref(&vtop
->type
, data_section
, offset
, size
<< 2);
795 vtop
->r
|= VT_LVAL
| VT_SYM
;
797 vtop
->c
.ptr_offset
= 0;
799 #ifdef CONFIG_TCC_BCHECK
800 if (vtop
->r
& VT_MUSTBOUND
)
804 r
= vtop
->r
& VT_VALMASK
;
805 rc2
= (rc
& RC_FLOAT
) ? RC_FLOAT
: RC_INT
;
806 #ifndef TCC_TARGET_ARM64
809 #ifdef TCC_TARGET_X86_64
810 else if (rc
== RC_FRET
)
815 /* need to reload if:
817 - lvalue (need to dereference pointer)
818 - already a register, but not in the right class */
820 || (vtop
->r
& VT_LVAL
)
821 || !(reg_classes
[r
] & rc
)
822 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
823 || ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
&& !(reg_classes
[vtop
->r2
] & rc2
))
824 || ((vtop
->type
.t
& VT_BTYPE
) == VT_QFLOAT
&& !(reg_classes
[vtop
->r2
] & rc2
))
826 || ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
&& !(reg_classes
[vtop
->r2
] & rc2
))
831 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
832 if (((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) || ((vtop
->type
.t
& VT_BTYPE
) == VT_QFLOAT
)) {
833 int addr_type
= VT_LLONG
, load_size
= 8, load_type
= ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) ? VT_LLONG
: VT_DOUBLE
;
835 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
836 int addr_type
= VT_INT
, load_size
= 4, load_type
= VT_INT
;
837 unsigned long long ll
;
839 int r2
, original_type
;
840 original_type
= vtop
->type
.t
;
841 /* two register type load : expand to two words
843 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
844 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
847 vtop
->c
.ui
= ll
; /* first word */
849 vtop
->r
= r
; /* save register value */
850 vpushi(ll
>> 32); /* second word */
853 if (r
>= VT_CONST
|| /* XXX: test to VT_CONST incorrect ? */
854 (vtop
->r
& VT_LVAL
)) {
855 /* We do not want to modifier the long long
856 pointer here, so the safest (and less
857 efficient) is to save all the other registers
858 in the stack. XXX: totally inefficient. */
860 /* load from memory */
861 vtop
->type
.t
= load_type
;
864 vtop
[-1].r
= r
; /* save register value */
865 /* increment pointer to get second word */
866 vtop
->type
.t
= addr_type
;
871 vtop
->type
.t
= load_type
;
876 vtop
[-1].r
= r
; /* save register value */
877 vtop
->r
= vtop
[-1].r2
;
879 /* Allocate second register. Here we rely on the fact that
880 get_reg() tries first to free r2 of an SValue. */
884 /* write second register */
886 vtop
->type
.t
= original_type
;
887 } else if ((vtop
->r
& VT_LVAL
) && !is_float(vtop
->type
.t
)) {
889 /* lvalue of scalar type : need to use lvalue type
890 because of possible cast */
893 /* compute memory access type */
894 if (vtop
->r
& VT_REF
)
895 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
900 else if (vtop
->r
& VT_LVAL_BYTE
)
902 else if (vtop
->r
& VT_LVAL_SHORT
)
904 if (vtop
->r
& VT_LVAL_UNSIGNED
)
908 /* restore wanted type */
911 /* one register type load */
916 #ifdef TCC_TARGET_C67
917 /* uses register pairs for doubles */
918 if ((vtop
->type
.t
& VT_BTYPE
) == VT_DOUBLE
)
925 /* generate vtop[-1] and vtop[0] in resp. classes rc1 and rc2 */
926 ST_FUNC
void gv2(int rc1
, int rc2
)
930 /* generate more generic register first. But VT_JMP or VT_CMP
931 values must be generated first in all cases to avoid possible
933 v
= vtop
[0].r
& VT_VALMASK
;
934 if (v
!= VT_CMP
&& (v
& ~1) != VT_JMP
&& rc1
<= rc2
) {
939 /* test if reload is needed for first register */
940 if ((vtop
[-1].r
& VT_VALMASK
) >= VT_CONST
) {
950 /* test if reload is needed for first register */
951 if ((vtop
[0].r
& VT_VALMASK
) >= VT_CONST
) {
957 #ifndef TCC_TARGET_ARM64
958 /* wrapper around RC_FRET to return a register by type */
959 static int rc_fret(int t
)
961 #ifdef TCC_TARGET_X86_64
962 if (t
== VT_LDOUBLE
) {
970 /* wrapper around REG_FRET to return a register by type */
971 static int reg_fret(int t
)
973 #ifdef TCC_TARGET_X86_64
974 if (t
== VT_LDOUBLE
) {
981 /* expand long long on stack in two int registers */
982 static void lexpand(void)
986 u
= vtop
->type
.t
& (VT_DEFSIGN
| VT_UNSIGNED
);
989 vtop
[0].r
= vtop
[-1].r2
;
990 vtop
[0].r2
= VT_CONST
;
991 vtop
[-1].r2
= VT_CONST
;
992 vtop
[0].type
.t
= VT_INT
| u
;
993 vtop
[-1].type
.t
= VT_INT
| u
;
996 #ifdef TCC_TARGET_ARM
997 /* expand long long on stack */
998 ST_FUNC
void lexpand_nr(void)
1002 u
= vtop
->type
.t
& (VT_DEFSIGN
| VT_UNSIGNED
);
1004 vtop
->r2
= VT_CONST
;
1005 vtop
->type
.t
= VT_INT
| u
;
1006 v
=vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
);
1007 if (v
== VT_CONST
) {
1008 vtop
[-1].c
.ui
= vtop
->c
.ull
;
1009 vtop
->c
.ui
= vtop
->c
.ull
>> 32;
1011 } else if (v
== (VT_LVAL
|VT_CONST
) || v
== (VT_LVAL
|VT_LOCAL
)) {
1013 vtop
->r
= vtop
[-1].r
;
1014 } else if (v
> VT_CONST
) {
1018 vtop
->r
= vtop
[-1].r2
;
1019 vtop
[-1].r2
= VT_CONST
;
1020 vtop
[-1].type
.t
= VT_INT
| u
;
1024 /* build a long long from two ints */
1025 static void lbuild(int t
)
1027 gv2(RC_INT
, RC_INT
);
1028 vtop
[-1].r2
= vtop
[0].r
;
1029 vtop
[-1].type
.t
= t
;
1033 /* rotate n first stack elements to the bottom
1034 I1 ... In -> I2 ... In I1 [top is right]
1036 ST_FUNC
void vrotb(int n
)
1042 for(i
=-n
+1;i
!=0;i
++)
1043 vtop
[i
] = vtop
[i
+1];
1047 /* rotate the n elements before entry e towards the top
1048 I1 ... In ... -> In I1 ... I(n-1) ... [top is right]
1050 ST_FUNC
void vrote(SValue
*e
, int n
)
1056 for(i
= 0;i
< n
- 1; i
++)
1061 /* rotate n first stack elements to the top
1062 I1 ... In -> In I1 ... I(n-1) [top is right]
1064 ST_FUNC
void vrott(int n
)
1069 /* pop stack value */
1070 ST_FUNC
void vpop(void)
1073 v
= vtop
->r
& VT_VALMASK
;
1074 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
1075 /* for x86, we need to pop the FP stack */
1076 if (v
== TREG_ST0
&& !nocode_wanted
) {
1077 o(0xd8dd); /* fstp %st(0) */
1080 if (v
== VT_JMP
|| v
== VT_JMPI
) {
1081 /* need to put correct jump if && or || without test */
1087 /* convert stack entry to register and duplicate its value in another
1089 static void gv_dup(void)
1095 if ((t
& VT_BTYPE
) == VT_LLONG
) {
1102 /* stack: H L L1 H1 */
1110 /* duplicate value */
1115 #ifdef TCC_TARGET_X86_64
1116 if ((t
& VT_BTYPE
) == VT_LDOUBLE
) {
1126 load(r1
, &sv
); /* move r to r1 */
1128 /* duplicates value */
1134 /* Generate value test
1136 * Generate a test for any value (jump, comparison and integers) */
1137 ST_FUNC
int gvtst(int inv
, int t
)
1139 int v
= vtop
->r
& VT_VALMASK
;
1140 if (v
!= VT_CMP
&& v
!= VT_JMP
&& v
!= VT_JMPI
) {
1144 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
1145 /* constant jmp optimization */
1146 if ((vtop
->c
.i
!= 0) != inv
)
1151 return gtst(inv
, t
);
1154 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
1155 /* generate CPU independent (unsigned) long long operations */
1156 static void gen_opl(int op
)
1158 int t
, a
, b
, op1
, c
, i
;
1160 unsigned short reg_iret
= REG_IRET
;
1161 unsigned short reg_lret
= REG_LRET
;
1167 func
= TOK___divdi3
;
1170 func
= TOK___udivdi3
;
1173 func
= TOK___moddi3
;
1176 func
= TOK___umoddi3
;
1183 /* call generic long long function */
1184 vpush_global_sym(&func_old_type
, func
);
1189 vtop
->r2
= reg_lret
;
1202 /* stack: L1 H1 L2 H2 */
1207 vtop
[-2] = vtop
[-3];
1210 /* stack: H1 H2 L1 L2 */
1216 /* stack: H1 H2 L1 L2 ML MH */
1219 /* stack: ML MH H1 H2 L1 L2 */
1223 /* stack: ML MH H1 L2 H2 L1 */
1228 /* stack: ML MH M1 M2 */
1231 } else if (op
== '+' || op
== '-') {
1232 /* XXX: add non carry method too (for MIPS or alpha) */
1238 /* stack: H1 H2 (L1 op L2) */
1241 gen_op(op1
+ 1); /* TOK_xxxC2 */
1244 /* stack: H1 H2 (L1 op L2) */
1247 /* stack: (L1 op L2) H1 H2 */
1249 /* stack: (L1 op L2) (H1 op H2) */
1257 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
1258 t
= vtop
[-1].type
.t
;
1262 /* stack: L H shift */
1264 /* constant: simpler */
1265 /* NOTE: all comments are for SHL. the other cases are
1266 done by swaping words */
1277 if (op
!= TOK_SAR
) {
1310 /* XXX: should provide a faster fallback on x86 ? */
1313 func
= TOK___ashrdi3
;
1316 func
= TOK___lshrdi3
;
1319 func
= TOK___ashldi3
;
1325 /* compare operations */
1331 /* stack: L1 H1 L2 H2 */
1333 vtop
[-1] = vtop
[-2];
1335 /* stack: L1 L2 H1 H2 */
1338 /* when values are equal, we need to compare low words. since
1339 the jump is inverted, we invert the test too. */
1342 else if (op1
== TOK_GT
)
1344 else if (op1
== TOK_ULT
)
1346 else if (op1
== TOK_UGT
)
1351 if (op1
!= TOK_NE
) {
1355 /* generate non equal test */
1356 /* XXX: NOT PORTABLE yet */
1360 #if defined(TCC_TARGET_I386)
1361 b
= psym(0x850f, 0);
1362 #elif defined(TCC_TARGET_ARM)
1364 o(0x1A000000 | encbranch(ind
, 0, 1));
1365 #elif defined(TCC_TARGET_C67) || defined(TCC_TARGET_ARM64)
1366 tcc_error("not implemented");
1368 #error not supported
1372 /* compare low. Always unsigned */
1376 else if (op1
== TOK_LE
)
1378 else if (op1
== TOK_GT
)
1380 else if (op1
== TOK_GE
)
1391 /* handle integer constant optimizations and various machine
1393 static void gen_opic(int op
)
1395 int c1
, c2
, t1
, t2
, n
;
1398 typedef unsigned long long U
;
1402 t1
= v1
->type
.t
& VT_BTYPE
;
1403 t2
= v2
->type
.t
& VT_BTYPE
;
1407 else if (v1
->type
.t
& VT_UNSIGNED
)
1414 else if (v2
->type
.t
& VT_UNSIGNED
)
1419 /* currently, we cannot do computations with forward symbols */
1420 c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1421 c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1424 case '+': l1
+= l2
; break;
1425 case '-': l1
-= l2
; break;
1426 case '&': l1
&= l2
; break;
1427 case '^': l1
^= l2
; break;
1428 case '|': l1
|= l2
; break;
1429 case '*': l1
*= l2
; break;
1436 /* if division by zero, generate explicit division */
1439 tcc_error("division by zero in constant");
1443 default: l1
/= l2
; break;
1444 case '%': l1
%= l2
; break;
1445 case TOK_UDIV
: l1
= (U
)l1
/ l2
; break;
1446 case TOK_UMOD
: l1
= (U
)l1
% l2
; break;
1449 case TOK_SHL
: l1
<<= l2
; break;
1450 case TOK_SHR
: l1
= (U
)l1
>> l2
; break;
1451 case TOK_SAR
: l1
>>= l2
; break;
1453 case TOK_ULT
: l1
= (U
)l1
< (U
)l2
; break;
1454 case TOK_UGE
: l1
= (U
)l1
>= (U
)l2
; break;
1455 case TOK_EQ
: l1
= l1
== l2
; break;
1456 case TOK_NE
: l1
= l1
!= l2
; break;
1457 case TOK_ULE
: l1
= (U
)l1
<= (U
)l2
; break;
1458 case TOK_UGT
: l1
= (U
)l1
> (U
)l2
; break;
1459 case TOK_LT
: l1
= l1
< l2
; break;
1460 case TOK_GE
: l1
= l1
>= l2
; break;
1461 case TOK_LE
: l1
= l1
<= l2
; break;
1462 case TOK_GT
: l1
= l1
> l2
; break;
1464 case TOK_LAND
: l1
= l1
&& l2
; break;
1465 case TOK_LOR
: l1
= l1
|| l2
; break;
1472 /* if commutative ops, put c2 as constant */
1473 if (c1
&& (op
== '+' || op
== '&' || op
== '^' ||
1474 op
== '|' || op
== '*')) {
1476 c2
= c1
; //c = c1, c1 = c2, c2 = c;
1477 l2
= l1
; //l = l1, l1 = l2, l2 = l;
1479 if (!const_wanted
&&
1481 (op
== TOK_SHL
|| op
== TOK_SHR
|| op
== TOK_SAR
)) ||
1482 (l1
== -1 && op
== TOK_SAR
))) {
1483 /* treat (0 << x), (0 >> x) and (-1 >> x) as constant */
1485 } else if (!const_wanted
&&
1486 c2
&& ((l2
== 0 && (op
== '&' || op
== '*')) ||
1487 (l2
== -1 && op
== '|') ||
1488 (l2
== 0xffffffff && t2
!= VT_LLONG
&& op
== '|') ||
1489 (l2
== 1 && (op
== '%' || op
== TOK_UMOD
)))) {
1490 /* treat (x & 0), (x * 0), (x | -1) and (x % 1) as constant */
1495 } else if (c2
&& (((op
== '*' || op
== '/' || op
== TOK_UDIV
||
1498 ((op
== '+' || op
== '-' || op
== '|' || op
== '^' ||
1499 op
== TOK_SHL
|| op
== TOK_SHR
|| op
== TOK_SAR
) &&
1503 /* filter out NOP operations like x*1, x-0, x&-1... */
1505 } else if (c2
&& (op
== '*' || op
== TOK_PDIV
|| op
== TOK_UDIV
)) {
1506 /* try to use shifts instead of muls or divs */
1507 if (l2
> 0 && (l2
& (l2
- 1)) == 0) {
1516 else if (op
== TOK_PDIV
)
1522 } else if (c2
&& (op
== '+' || op
== '-') &&
1523 (((vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
))
1524 || (vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
)) == VT_LOCAL
)) {
1525 /* symbol + constant case */
1532 if (!nocode_wanted
) {
1533 /* call low level op generator */
1534 if (t1
== VT_LLONG
|| t2
== VT_LLONG
||
1535 (PTR_SIZE
== 8 && (t1
== VT_PTR
|| t2
== VT_PTR
)))
1546 /* generate a floating point operation with constant propagation */
1547 static void gen_opif(int op
)
1555 /* currently, we cannot do computations with forward symbols */
1556 c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1557 c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1559 if (v1
->type
.t
== VT_FLOAT
) {
1562 } else if (v1
->type
.t
== VT_DOUBLE
) {
1570 /* NOTE: we only do constant propagation if finite number (not
1571 NaN or infinity) (ANSI spec) */
1572 if (!ieee_finite(f1
) || !ieee_finite(f2
))
1576 case '+': f1
+= f2
; break;
1577 case '-': f1
-= f2
; break;
1578 case '*': f1
*= f2
; break;
1582 tcc_error("division by zero in constant");
1587 /* XXX: also handles tests ? */
1591 /* XXX: overflow test ? */
1592 if (v1
->type
.t
== VT_FLOAT
) {
1594 } else if (v1
->type
.t
== VT_DOUBLE
) {
1602 if (!nocode_wanted
) {
1610 static int pointed_size(CType
*type
)
1613 return type_size(pointed_type(type
), &align
);
1616 static void vla_runtime_pointed_size(CType
*type
)
1619 vla_runtime_type_size(pointed_type(type
), &align
);
1622 static inline int is_null_pointer(SValue
*p
)
1624 if ((p
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
1626 return ((p
->type
.t
& VT_BTYPE
) == VT_INT
&& p
->c
.i
== 0) ||
1627 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& p
->c
.ll
== 0) ||
1628 ((p
->type
.t
& VT_BTYPE
) == VT_PTR
&& p
->c
.ptr_offset
== 0);
1631 static inline int is_integer_btype(int bt
)
1633 return (bt
== VT_BYTE
|| bt
== VT_SHORT
||
1634 bt
== VT_INT
|| bt
== VT_LLONG
);
1637 /* check types for comparison or subtraction of pointers */
1638 static void check_comparison_pointer_types(SValue
*p1
, SValue
*p2
, int op
)
1640 CType
*type1
, *type2
, tmp_type1
, tmp_type2
;
1643 /* null pointers are accepted for all comparisons as gcc */
1644 if (is_null_pointer(p1
) || is_null_pointer(p2
))
1648 bt1
= type1
->t
& VT_BTYPE
;
1649 bt2
= type2
->t
& VT_BTYPE
;
1650 /* accept comparison between pointer and integer with a warning */
1651 if ((is_integer_btype(bt1
) || is_integer_btype(bt2
)) && op
!= '-') {
1652 if (op
!= TOK_LOR
&& op
!= TOK_LAND
)
1653 tcc_warning("comparison between pointer and integer");
1657 /* both must be pointers or implicit function pointers */
1658 if (bt1
== VT_PTR
) {
1659 type1
= pointed_type(type1
);
1660 } else if (bt1
!= VT_FUNC
)
1661 goto invalid_operands
;
1663 if (bt2
== VT_PTR
) {
1664 type2
= pointed_type(type2
);
1665 } else if (bt2
!= VT_FUNC
) {
1667 tcc_error("invalid operands to binary %s", get_tok_str(op
, NULL
));
1669 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
1670 (type2
->t
& VT_BTYPE
) == VT_VOID
)
1674 tmp_type1
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1675 tmp_type2
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1676 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
1677 /* gcc-like error if '-' is used */
1679 goto invalid_operands
;
1681 tcc_warning("comparison of distinct pointer types lacks a cast");
1685 /* generic gen_op: handles types problems */
1686 ST_FUNC
void gen_op(int op
)
1688 int u
, t1
, t2
, bt1
, bt2
, t
;
1691 t1
= vtop
[-1].type
.t
;
1692 t2
= vtop
[0].type
.t
;
1693 bt1
= t1
& VT_BTYPE
;
1694 bt2
= t2
& VT_BTYPE
;
1696 if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
1697 /* at least one operand is a pointer */
1698 /* relationnal op: must be both pointers */
1699 if (op
>= TOK_ULT
&& op
<= TOK_LOR
) {
1700 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1701 /* pointers are handled are unsigned */
1702 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1703 t
= VT_LLONG
| VT_UNSIGNED
;
1705 t
= VT_INT
| VT_UNSIGNED
;
1709 /* if both pointers, then it must be the '-' op */
1710 if (bt1
== VT_PTR
&& bt2
== VT_PTR
) {
1712 tcc_error("cannot use pointers here");
1713 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1714 /* XXX: check that types are compatible */
1715 if (vtop
[-1].type
.t
& VT_VLA
) {
1716 vla_runtime_pointed_size(&vtop
[-1].type
);
1718 vpushi(pointed_size(&vtop
[-1].type
));
1722 /* set to integer type */
1723 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1724 vtop
->type
.t
= VT_LLONG
;
1726 vtop
->type
.t
= VT_INT
;
1731 /* exactly one pointer : must be '+' or '-'. */
1732 if (op
!= '-' && op
!= '+')
1733 tcc_error("cannot use pointers here");
1734 /* Put pointer as first operand */
1735 if (bt2
== VT_PTR
) {
1739 type1
= vtop
[-1].type
;
1740 type1
.t
&= ~VT_ARRAY
;
1741 if (vtop
[-1].type
.t
& VT_VLA
)
1742 vla_runtime_pointed_size(&vtop
[-1].type
);
1744 u
= pointed_size(&vtop
[-1].type
);
1746 tcc_error("unknown array element size");
1747 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1750 /* XXX: cast to int ? (long long case) */
1756 /* #ifdef CONFIG_TCC_BCHECK
1757 The main reason to removing this code:
1764 fprintf(stderr, "v+i-j = %p\n", v+i-j);
1765 fprintf(stderr, "v+(i-j) = %p\n", v+(i-j));
1767 When this code is on. then the output looks like
1769 v+(i-j) = 0xbff84000
1771 /* if evaluating constant expression, no code should be
1772 generated, so no bound check */
1773 if (tcc_state
->do_bounds_check
&& !const_wanted
) {
1774 /* if bounded pointers, we generate a special code to
1781 gen_bounded_ptr_add();
1787 /* put again type if gen_opic() swaped operands */
1790 } else if (is_float(bt1
) || is_float(bt2
)) {
1791 /* compute bigger type and do implicit casts */
1792 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
1794 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
1799 /* floats can only be used for a few operations */
1800 if (op
!= '+' && op
!= '-' && op
!= '*' && op
!= '/' &&
1801 (op
< TOK_ULT
|| op
> TOK_GT
))
1802 tcc_error("invalid operands for binary operation");
1804 } else if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
) {
1805 t
= bt1
== VT_LLONG
? VT_LLONG
: VT_INT
;
1806 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (t
| VT_UNSIGNED
))
1809 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
1810 /* cast to biggest op */
1812 /* convert to unsigned if it does not fit in a long long */
1813 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
1814 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
1817 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
1818 tcc_error("comparison of struct");
1820 /* integer operations */
1822 /* convert to unsigned if it does not fit in an integer */
1823 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
1824 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
1827 /* XXX: currently, some unsigned operations are explicit, so
1828 we modify them here */
1829 if (t
& VT_UNSIGNED
) {
1836 else if (op
== TOK_LT
)
1838 else if (op
== TOK_GT
)
1840 else if (op
== TOK_LE
)
1842 else if (op
== TOK_GE
)
1849 /* special case for shifts and long long: we keep the shift as
1851 if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
)
1858 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
1859 /* relationnal op: the result is an int */
1860 vtop
->type
.t
= VT_INT
;
1865 // Make sure that we have converted to an rvalue:
1866 if (vtop
->r
& VT_LVAL
&& !nocode_wanted
)
1867 gv(is_float(vtop
->type
.t
& VT_BTYPE
) ? RC_FLOAT
: RC_INT
);
1870 #ifndef TCC_TARGET_ARM
1871 /* generic itof for unsigned long long case */
1872 static void gen_cvt_itof1(int t
)
1874 #ifdef TCC_TARGET_ARM64
1877 if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
1878 (VT_LLONG
| VT_UNSIGNED
)) {
1881 vpush_global_sym(&func_old_type
, TOK___floatundisf
);
1882 #if LDOUBLE_SIZE != 8
1883 else if (t
== VT_LDOUBLE
)
1884 vpush_global_sym(&func_old_type
, TOK___floatundixf
);
1887 vpush_global_sym(&func_old_type
, TOK___floatundidf
);
1891 vtop
->r
= reg_fret(t
);
1899 /* generic ftoi for unsigned long long case */
1900 static void gen_cvt_ftoi1(int t
)
1902 #ifdef TCC_TARGET_ARM64
1907 if (t
== (VT_LLONG
| VT_UNSIGNED
)) {
1908 /* not handled natively */
1909 st
= vtop
->type
.t
& VT_BTYPE
;
1911 vpush_global_sym(&func_old_type
, TOK___fixunssfdi
);
1912 #if LDOUBLE_SIZE != 8
1913 else if (st
== VT_LDOUBLE
)
1914 vpush_global_sym(&func_old_type
, TOK___fixunsxfdi
);
1917 vpush_global_sym(&func_old_type
, TOK___fixunsdfdi
);
1922 vtop
->r2
= REG_LRET
;
1929 /* force char or short cast */
1930 static void force_charshort_cast(int t
)
1934 /* XXX: add optimization if lvalue : just change type and offset */
1939 if (t
& VT_UNSIGNED
) {
1940 vpushi((1 << bits
) - 1);
1946 /* result must be signed or the SAR is converted to an SHL
1947 This was not the case when "t" was a signed short
1948 and the last value on the stack was an unsigned int */
1949 vtop
->type
.t
&= ~VT_UNSIGNED
;
1955 /* cast 'vtop' to 'type'. Casting to bitfields is forbidden. */
1956 static void gen_cast(CType
*type
)
1958 int sbt
, dbt
, sf
, df
, c
, p
;
1960 /* special delayed cast for char/short */
1961 /* XXX: in some cases (multiple cascaded casts), it may still
1963 if (vtop
->r
& VT_MUSTCAST
) {
1964 vtop
->r
&= ~VT_MUSTCAST
;
1965 force_charshort_cast(vtop
->type
.t
);
1968 /* bitfields first get cast to ints */
1969 if (vtop
->type
.t
& VT_BITFIELD
&& !nocode_wanted
) {
1973 dbt
= type
->t
& (VT_BTYPE
| VT_UNSIGNED
);
1974 sbt
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
1979 c
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1980 p
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
);
1982 /* constant case: we can do it now */
1983 /* XXX: in ISOC, cannot do it if error in convert */
1984 if (sbt
== VT_FLOAT
)
1985 vtop
->c
.ld
= vtop
->c
.f
;
1986 else if (sbt
== VT_DOUBLE
)
1987 vtop
->c
.ld
= vtop
->c
.d
;
1990 if ((sbt
& VT_BTYPE
) == VT_LLONG
) {
1991 if (sbt
& VT_UNSIGNED
)
1992 vtop
->c
.ld
= vtop
->c
.ull
;
1994 vtop
->c
.ld
= vtop
->c
.ll
;
1996 if (sbt
& VT_UNSIGNED
)
1997 vtop
->c
.ld
= vtop
->c
.ui
;
1999 vtop
->c
.ld
= vtop
->c
.i
;
2002 if (dbt
== VT_FLOAT
)
2003 vtop
->c
.f
= (float)vtop
->c
.ld
;
2004 else if (dbt
== VT_DOUBLE
)
2005 vtop
->c
.d
= (double)vtop
->c
.ld
;
2006 } else if (sf
&& dbt
== (VT_LLONG
|VT_UNSIGNED
)) {
2007 vtop
->c
.ull
= (unsigned long long)vtop
->c
.ld
;
2008 } else if (sf
&& dbt
== VT_BOOL
) {
2009 vtop
->c
.i
= (vtop
->c
.ld
!= 0);
2012 vtop
->c
.ll
= (long long)vtop
->c
.ld
;
2013 else if (sbt
== (VT_LLONG
|VT_UNSIGNED
))
2014 vtop
->c
.ll
= vtop
->c
.ull
;
2015 else if (sbt
& VT_UNSIGNED
)
2016 vtop
->c
.ll
= vtop
->c
.ui
;
2017 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2018 else if (sbt
== VT_PTR
)
2021 else if (sbt
!= VT_LLONG
)
2022 vtop
->c
.ll
= vtop
->c
.i
;
2024 if (dbt
== (VT_LLONG
|VT_UNSIGNED
))
2025 vtop
->c
.ull
= vtop
->c
.ll
;
2026 else if (dbt
== VT_BOOL
)
2027 vtop
->c
.i
= (vtop
->c
.ll
!= 0);
2028 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2029 else if (dbt
== VT_PTR
)
2032 else if (dbt
!= VT_LLONG
) {
2034 if ((dbt
& VT_BTYPE
) == VT_BYTE
)
2036 else if ((dbt
& VT_BTYPE
) == VT_SHORT
)
2038 if(dbt
& VT_UNSIGNED
)
2039 vtop
->c
.ui
= ((unsigned int)vtop
->c
.ll
<< s
) >> s
;
2041 vtop
->c
.i
= ((int)vtop
->c
.ll
<< s
) >> s
;
2044 } else if (p
&& dbt
== VT_BOOL
) {
2047 } else if (!nocode_wanted
) {
2048 /* non constant case: generate code */
2050 /* convert from fp to fp */
2053 /* convert int to fp */
2056 /* convert fp to int */
2057 if (dbt
== VT_BOOL
) {
2061 /* we handle char/short/etc... with generic code */
2062 if (dbt
!= (VT_INT
| VT_UNSIGNED
) &&
2063 dbt
!= (VT_LLONG
| VT_UNSIGNED
) &&
2067 if (dbt
== VT_INT
&& (type
->t
& (VT_BTYPE
| VT_UNSIGNED
)) != dbt
) {
2068 /* additional cast for char/short... */
2073 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
2074 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
) {
2075 if ((sbt
& VT_BTYPE
) != VT_LLONG
&& !nocode_wanted
) {
2076 /* scalar to long long */
2077 /* machine independent conversion */
2079 /* generate high word */
2080 if (sbt
== (VT_INT
| VT_UNSIGNED
)) {
2084 if (sbt
== VT_PTR
) {
2085 /* cast from pointer to int before we apply
2086 shift operation, which pointers don't support*/
2087 gen_cast(&int_type
);
2093 /* patch second register */
2094 vtop
[-1].r2
= vtop
->r
;
2098 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
||
2099 (dbt
& VT_BTYPE
) == VT_PTR
||
2100 (dbt
& VT_BTYPE
) == VT_FUNC
) {
2101 if ((sbt
& VT_BTYPE
) != VT_LLONG
&&
2102 (sbt
& VT_BTYPE
) != VT_PTR
&&
2103 (sbt
& VT_BTYPE
) != VT_FUNC
&& !nocode_wanted
) {
2104 /* need to convert from 32bit to 64bit */
2106 if (sbt
!= (VT_INT
| VT_UNSIGNED
)) {
2107 #if defined(TCC_TARGET_ARM64)
2109 #elif defined(TCC_TARGET_X86_64)
2111 /* x86_64 specific: movslq */
2113 o(0xc0 + (REG_VALUE(r
) << 3) + REG_VALUE(r
));
2120 } else if (dbt
== VT_BOOL
) {
2121 /* scalar to bool */
2124 } else if ((dbt
& VT_BTYPE
) == VT_BYTE
||
2125 (dbt
& VT_BTYPE
) == VT_SHORT
) {
2126 if (sbt
== VT_PTR
) {
2127 vtop
->type
.t
= VT_INT
;
2128 tcc_warning("nonportable conversion from pointer to char/short");
2130 force_charshort_cast(dbt
);
2131 } else if ((dbt
& VT_BTYPE
) == VT_INT
) {
2133 if (sbt
== VT_LLONG
&& !nocode_wanted
) {
2134 /* from long long: just take low order word */
2138 /* if lvalue and single word type, nothing to do because
2139 the lvalue already contains the real type size (see
2140 VT_LVAL_xxx constants) */
2143 } else if ((dbt
& VT_BTYPE
) == VT_PTR
&& !(vtop
->r
& VT_LVAL
)) {
2144 /* if we are casting between pointer types,
2145 we must update the VT_LVAL_xxx size */
2146 vtop
->r
= (vtop
->r
& ~VT_LVAL_TYPE
)
2147 | (lvalue_type(type
->ref
->type
.t
) & VT_LVAL_TYPE
);
2152 /* return type size as known at compile time. Put alignment at 'a' */
2153 ST_FUNC
int type_size(CType
*type
, int *a
)
2158 bt
= type
->t
& VT_BTYPE
;
2159 if (bt
== VT_STRUCT
) {
2164 } else if (bt
== VT_PTR
) {
2165 if (type
->t
& VT_ARRAY
) {
2169 ts
= type_size(&s
->type
, a
);
2171 if (ts
< 0 && s
->c
< 0)
2179 } else if (bt
== VT_LDOUBLE
) {
2181 return LDOUBLE_SIZE
;
2182 } else if (bt
== VT_DOUBLE
|| bt
== VT_LLONG
) {
2183 #ifdef TCC_TARGET_I386
2184 #ifdef TCC_TARGET_PE
2189 #elif defined(TCC_TARGET_ARM)
2199 } else if (bt
== VT_INT
|| bt
== VT_ENUM
|| bt
== VT_FLOAT
) {
2202 } else if (bt
== VT_SHORT
) {
2205 } else if (bt
== VT_QLONG
|| bt
== VT_QFLOAT
) {
2209 /* char, void, function, _Bool */
2215 /* push type size as known at runtime time on top of value stack. Put
2217 ST_FUNC
void vla_runtime_type_size(CType
*type
, int *a
)
2219 if (type
->t
& VT_VLA
) {
2220 vset(&int_type
, VT_LOCAL
|VT_LVAL
, type
->ref
->c
);
2222 vpushi(type_size(type
, a
));
2226 static void vla_sp_restore(void) {
2227 if (vlas_in_scope
) {
2228 gen_vla_sp_restore(vla_sp_loc
);
2232 static void vla_sp_restore_root(void) {
2233 if (vlas_in_scope
) {
2234 gen_vla_sp_restore(vla_sp_root_loc
);
2238 /* return the pointed type of t */
2239 static inline CType
*pointed_type(CType
*type
)
2241 return &type
->ref
->type
;
2244 /* modify type so that its it is a pointer to type. */
2245 ST_FUNC
void mk_pointer(CType
*type
)
2248 s
= sym_push(SYM_FIELD
, type
, 0, -1);
2249 type
->t
= VT_PTR
| (type
->t
& ~VT_TYPE
);
2253 /* compare function types. OLD functions match any new functions */
2254 static int is_compatible_func(CType
*type1
, CType
*type2
)
2260 if (!is_compatible_types(&s1
->type
, &s2
->type
))
2262 /* check func_call */
2263 if (s1
->a
.func_call
!= s2
->a
.func_call
)
2265 /* XXX: not complete */
2266 if (s1
->c
== FUNC_OLD
|| s2
->c
== FUNC_OLD
)
2270 while (s1
!= NULL
) {
2273 if (!is_compatible_parameter_types(&s1
->type
, &s2
->type
))
2283 /* return true if type1 and type2 are the same. If unqualified is
2284 true, qualifiers on the types are ignored.
2286 - enums are not checked as gcc __builtin_types_compatible_p ()
2288 static int compare_types(CType
*type1
, CType
*type2
, int unqualified
)
2292 t1
= type1
->t
& VT_TYPE
;
2293 t2
= type2
->t
& VT_TYPE
;
2295 /* strip qualifiers before comparing */
2296 t1
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2297 t2
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2299 /* Default Vs explicit signedness only matters for char */
2300 if ((t1
& VT_BTYPE
) != VT_BYTE
) {
2304 /* XXX: bitfields ? */
2307 /* test more complicated cases */
2308 bt1
= t1
& VT_BTYPE
;
2309 if (bt1
== VT_PTR
) {
2310 type1
= pointed_type(type1
);
2311 type2
= pointed_type(type2
);
2312 return is_compatible_types(type1
, type2
);
2313 } else if (bt1
== VT_STRUCT
) {
2314 return (type1
->ref
== type2
->ref
);
2315 } else if (bt1
== VT_FUNC
) {
2316 return is_compatible_func(type1
, type2
);
2322 /* return true if type1 and type2 are exactly the same (including
2325 static int is_compatible_types(CType
*type1
, CType
*type2
)
2327 return compare_types(type1
,type2
,0);
2330 /* return true if type1 and type2 are the same (ignoring qualifiers).
2332 static int is_compatible_parameter_types(CType
*type1
, CType
*type2
)
2334 return compare_types(type1
,type2
,1);
2337 /* print a type. If 'varstr' is not NULL, then the variable is also
2338 printed in the type */
2340 /* XXX: add array and function pointers */
2341 static void type_to_str(char *buf
, int buf_size
,
2342 CType
*type
, const char *varstr
)
2349 t
= type
->t
& VT_TYPE
;
2352 if (t
& VT_CONSTANT
)
2353 pstrcat(buf
, buf_size
, "const ");
2354 if (t
& VT_VOLATILE
)
2355 pstrcat(buf
, buf_size
, "volatile ");
2356 if ((t
& (VT_DEFSIGN
| VT_UNSIGNED
)) == (VT_DEFSIGN
| VT_UNSIGNED
))
2357 pstrcat(buf
, buf_size
, "unsigned ");
2358 else if (t
& VT_DEFSIGN
)
2359 pstrcat(buf
, buf_size
, "signed ");
2389 tstr
= "long double";
2391 pstrcat(buf
, buf_size
, tstr
);
2395 if (bt
== VT_STRUCT
)
2399 pstrcat(buf
, buf_size
, tstr
);
2400 v
= type
->ref
->v
& ~SYM_STRUCT
;
2401 if (v
>= SYM_FIRST_ANOM
)
2402 pstrcat(buf
, buf_size
, "<anonymous>");
2404 pstrcat(buf
, buf_size
, get_tok_str(v
, NULL
));
2408 type_to_str(buf
, buf_size
, &s
->type
, varstr
);
2409 pstrcat(buf
, buf_size
, "(");
2411 while (sa
!= NULL
) {
2412 type_to_str(buf1
, sizeof(buf1
), &sa
->type
, NULL
);
2413 pstrcat(buf
, buf_size
, buf1
);
2416 pstrcat(buf
, buf_size
, ", ");
2418 pstrcat(buf
, buf_size
, ")");
2422 pstrcpy(buf1
, sizeof(buf1
), "*");
2424 pstrcat(buf1
, sizeof(buf1
), varstr
);
2425 type_to_str(buf
, buf_size
, &s
->type
, buf1
);
2429 pstrcat(buf
, buf_size
, " ");
2430 pstrcat(buf
, buf_size
, varstr
);
2435 /* verify type compatibility to store vtop in 'dt' type, and generate
2437 static void gen_assign_cast(CType
*dt
)
2439 CType
*st
, *type1
, *type2
, tmp_type1
, tmp_type2
;
2440 char buf1
[256], buf2
[256];
2443 st
= &vtop
->type
; /* source type */
2444 dbt
= dt
->t
& VT_BTYPE
;
2445 sbt
= st
->t
& VT_BTYPE
;
2446 if (sbt
== VT_VOID
|| dbt
== VT_VOID
) {
2447 if (sbt
== VT_VOID
&& dbt
== VT_VOID
)
2449 It is Ok if both are void
2455 gcc accepts this program
2458 tcc_error("cannot cast from/to void");
2460 if (dt
->t
& VT_CONSTANT
)
2461 tcc_warning("assignment of read-only location");
2464 /* special cases for pointers */
2465 /* '0' can also be a pointer */
2466 if (is_null_pointer(vtop
))
2468 /* accept implicit pointer to integer cast with warning */
2469 if (is_integer_btype(sbt
)) {
2470 tcc_warning("assignment makes pointer from integer without a cast");
2473 type1
= pointed_type(dt
);
2474 /* a function is implicitely a function pointer */
2475 if (sbt
== VT_FUNC
) {
2476 if ((type1
->t
& VT_BTYPE
) != VT_VOID
&&
2477 !is_compatible_types(pointed_type(dt
), st
))
2478 tcc_warning("assignment from incompatible pointer type");
2483 type2
= pointed_type(st
);
2484 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
2485 (type2
->t
& VT_BTYPE
) == VT_VOID
) {
2486 /* void * can match anything */
2488 /* exact type match, except for unsigned */
2491 tmp_type1
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
|
2493 tmp_type2
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
|
2495 if (!is_compatible_types(&tmp_type1
, &tmp_type2
))
2496 tcc_warning("assignment from incompatible pointer type");
2498 /* check const and volatile */
2499 if ((!(type1
->t
& VT_CONSTANT
) && (type2
->t
& VT_CONSTANT
)) ||
2500 (!(type1
->t
& VT_VOLATILE
) && (type2
->t
& VT_VOLATILE
)))
2501 tcc_warning("assignment discards qualifiers from pointer target type");
2507 if (sbt
== VT_PTR
|| sbt
== VT_FUNC
) {
2508 tcc_warning("assignment makes integer from pointer without a cast");
2510 /* XXX: more tests */
2515 tmp_type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2516 tmp_type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2517 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
2519 type_to_str(buf1
, sizeof(buf1
), st
, NULL
);
2520 type_to_str(buf2
, sizeof(buf2
), dt
, NULL
);
2521 tcc_error("cannot cast '%s' to '%s'", buf1
, buf2
);
2529 /* store vtop in lvalue pushed on stack */
2530 ST_FUNC
void vstore(void)
2532 int sbt
, dbt
, ft
, r
, t
, size
, align
, bit_size
, bit_pos
, rc
, delayed_cast
;
2534 ft
= vtop
[-1].type
.t
;
2535 sbt
= vtop
->type
.t
& VT_BTYPE
;
2536 dbt
= ft
& VT_BTYPE
;
2537 if ((((sbt
== VT_INT
|| sbt
== VT_SHORT
) && dbt
== VT_BYTE
) ||
2538 (sbt
== VT_INT
&& dbt
== VT_SHORT
))
2539 && !(vtop
->type
.t
& VT_BITFIELD
)) {
2540 /* optimize char/short casts */
2541 delayed_cast
= VT_MUSTCAST
;
2542 vtop
->type
.t
= ft
& (VT_TYPE
& ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
)));
2543 /* XXX: factorize */
2544 if (ft
& VT_CONSTANT
)
2545 tcc_warning("assignment of read-only location");
2548 if (!(ft
& VT_BITFIELD
))
2549 gen_assign_cast(&vtop
[-1].type
);
2552 if (sbt
== VT_STRUCT
) {
2553 /* if structure, only generate pointer */
2554 /* structure assignment : generate memcpy */
2555 /* XXX: optimize if small size */
2556 if (!nocode_wanted
) {
2557 size
= type_size(&vtop
->type
, &align
);
2561 vtop
->type
.t
= VT_PTR
;
2564 /* address of memcpy() */
2567 vpush_global_sym(&func_old_type
, TOK_memcpy8
);
2568 else if(!(align
& 3))
2569 vpush_global_sym(&func_old_type
, TOK_memcpy4
);
2572 vpush_global_sym(&func_old_type
, TOK_memcpy
);
2577 vtop
->type
.t
= VT_PTR
;
2586 /* leave source on stack */
2587 } else if (ft
& VT_BITFIELD
) {
2588 /* bitfield store handling */
2590 /* save lvalue as expression result (example: s.b = s.a = n;) */
2591 vdup(), vtop
[-1] = vtop
[-2];
2593 bit_pos
= (ft
>> VT_STRUCT_SHIFT
) & 0x3f;
2594 bit_size
= (ft
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
2595 /* remove bit field info to avoid loops */
2596 vtop
[-1].type
.t
= ft
& ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
));
2598 if((ft
& VT_BTYPE
) == VT_BOOL
) {
2599 gen_cast(&vtop
[-1].type
);
2600 vtop
[-1].type
.t
= (vtop
[-1].type
.t
& ~VT_BTYPE
) | (VT_BYTE
| VT_UNSIGNED
);
2603 /* duplicate destination */
2605 vtop
[-1] = vtop
[-2];
2607 /* mask and shift source */
2608 if((ft
& VT_BTYPE
) != VT_BOOL
) {
2609 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2610 vpushll((1ULL << bit_size
) - 1ULL);
2612 vpushi((1 << bit_size
) - 1);
2618 /* load destination, mask and or with source */
2620 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2621 vpushll(~(((1ULL << bit_size
) - 1ULL) << bit_pos
));
2623 vpushi(~(((1 << bit_size
) - 1) << bit_pos
));
2629 /* ... and discard */
2633 if (!nocode_wanted
) {
2634 #ifdef CONFIG_TCC_BCHECK
2635 /* bound check case */
2636 if (vtop
[-1].r
& VT_MUSTBOUND
) {
2645 #ifdef TCC_TARGET_X86_64
2646 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
2648 } else if ((ft
& VT_BTYPE
) == VT_QFLOAT
) {
2653 r
= gv(rc
); /* generate value */
2654 /* if lvalue was saved on stack, must read it */
2655 if ((vtop
[-1].r
& VT_VALMASK
) == VT_LLOCAL
) {
2657 t
= get_reg(RC_INT
);
2658 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2663 sv
.r
= VT_LOCAL
| VT_LVAL
;
2664 sv
.c
.ul
= vtop
[-1].c
.ul
;
2666 vtop
[-1].r
= t
| VT_LVAL
;
2668 /* two word case handling : store second register at word + 4 (or +8 for x86-64) */
2669 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2670 if (((ft
& VT_BTYPE
) == VT_QLONG
) || ((ft
& VT_BTYPE
) == VT_QFLOAT
)) {
2671 int addr_type
= VT_LLONG
, load_size
= 8, load_type
= ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) ? VT_LLONG
: VT_DOUBLE
;
2673 if ((ft
& VT_BTYPE
) == VT_LLONG
) {
2674 int addr_type
= VT_INT
, load_size
= 4, load_type
= VT_INT
;
2676 vtop
[-1].type
.t
= load_type
;
2679 /* convert to int to increment easily */
2680 vtop
->type
.t
= addr_type
;
2686 vtop
[-1].type
.t
= load_type
;
2687 /* XXX: it works because r2 is spilled last ! */
2688 store(vtop
->r2
, vtop
- 1);
2694 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
2695 vtop
->r
|= delayed_cast
;
2699 /* post defines POST/PRE add. c is the token ++ or -- */
2700 ST_FUNC
void inc(int post
, int c
)
2703 vdup(); /* save lvalue */
2706 gv_dup(); /* duplicate value */
2708 vdup(); /* duplicate value */
2713 vpushi(c
- TOK_MID
);
2715 vstore(); /* store value */
2717 vpop(); /* if post op, return saved value */
2720 /* Parse GNUC __attribute__ extension. Currently, the following
2721 extensions are recognized:
2722 - aligned(n) : set data/function alignment.
2723 - packed : force data alignment to 1
2724 - section(x) : generate data/code in this section.
2725 - unused : currently ignored, but may be used someday.
2726 - regparm(n) : pass function parameters in registers (i386 only)
2728 static void parse_attribute(AttributeDef
*ad
)
2732 while (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
) {
2736 while (tok
!= ')') {
2737 if (tok
< TOK_IDENT
)
2738 expect("attribute name");
2746 expect("section name");
2747 ad
->section
= find_section(tcc_state
, (char *)tokc
.cstr
->data
);
2755 expect("alias(\"target\")");
2756 ad
->alias_target
= /* save string as token, for later */
2757 tok_alloc((char*)tokc
.cstr
->data
, tokc
.cstr
->size
-1)->tok
;
2761 case TOK_VISIBILITY1
:
2762 case TOK_VISIBILITY2
:
2765 expect("visibility(\"default|hidden|internal|protected\")");
2766 if (!strcmp (tokc
.cstr
->data
, "default"))
2767 ad
->a
.visibility
= STV_DEFAULT
;
2768 else if (!strcmp (tokc
.cstr
->data
, "hidden"))
2769 ad
->a
.visibility
= STV_HIDDEN
;
2770 else if (!strcmp (tokc
.cstr
->data
, "internal"))
2771 ad
->a
.visibility
= STV_INTERNAL
;
2772 else if (!strcmp (tokc
.cstr
->data
, "protected"))
2773 ad
->a
.visibility
= STV_PROTECTED
;
2775 expect("visibility(\"default|hidden|internal|protected\")");
2784 if (n
<= 0 || (n
& (n
- 1)) != 0)
2785 tcc_error("alignment must be a positive power of two");
2802 /* currently, no need to handle it because tcc does not
2803 track unused objects */
2807 /* currently, no need to handle it because tcc does not
2808 track unused objects */
2813 ad
->a
.func_call
= FUNC_CDECL
;
2818 ad
->a
.func_call
= FUNC_STDCALL
;
2820 #ifdef TCC_TARGET_I386
2830 ad
->a
.func_call
= FUNC_FASTCALL1
+ n
- 1;
2836 ad
->a
.func_call
= FUNC_FASTCALLW
;
2843 ad
->a
.mode
= VT_LLONG
+ 1;
2846 ad
->a
.mode
= VT_SHORT
+ 1;
2849 ad
->a
.mode
= VT_INT
+ 1;
2852 tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok
, NULL
));
2859 ad
->a
.func_export
= 1;
2862 ad
->a
.func_import
= 1;
2865 if (tcc_state
->warn_unsupported
)
2866 tcc_warning("'%s' attribute ignored", get_tok_str(t
, NULL
));
2867 /* skip parameters */
2869 int parenthesis
= 0;
2873 else if (tok
== ')')
2876 } while (parenthesis
&& tok
!= -1);
2889 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
2890 static void struct_decl(CType
*type
, int u
, int tdef
)
2892 int a
, v
, size
, align
, maxalign
, c
, offset
, flexible
;
2893 int bit_size
, bit_pos
, bsize
, bt
, lbit_pos
, prevbt
;
2894 Sym
*s
, *ss
, *ass
, **ps
;
2898 a
= tok
; /* save decl type */
2903 /* struct already defined ? return it */
2905 expect("struct/union/enum name");
2909 tcc_error("invalid type");
2911 } else if (tok
>= TOK_IDENT
&& !tdef
)
2912 tcc_error("unknown struct/union/enum");
2918 /* we put an undefined size for struct/union */
2919 s
= sym_push(v
| SYM_STRUCT
, &type1
, 0, -1);
2920 s
->r
= 0; /* default alignment is zero as gcc */
2921 /* put struct/union/enum name in type */
2929 tcc_error("struct/union/enum already defined");
2930 /* cannot be empty */
2932 /* non empty enums are not allowed */
2933 if (a
== TOK_ENUM
) {
2937 expect("identifier");
2939 if (ss
&& !local_stack
)
2940 tcc_error("redefinition of enumerator '%s'",
2941 get_tok_str(v
, NULL
));
2947 /* enum symbols have static storage */
2948 ss
= sym_push(v
, &int_type
, VT_CONST
, c
);
2949 ss
->type
.t
|= VT_STATIC
;
2954 /* NOTE: we accept a trailing comma */
2958 s
->c
= type_size(&int_type
, &align
);
2967 while (tok
!= '}') {
2968 parse_btype(&btype
, &ad
);
2971 tcc_error("flexible array member '%s' not at the end of struct",
2972 get_tok_str(v
, NULL
));
2977 type_decl(&type1
, &ad
, &v
, TYPE_DIRECT
| TYPE_ABSTRACT
);
2979 if ((type1
.t
& VT_BTYPE
) != VT_STRUCT
)
2980 expect("identifier");
2982 int v
= btype
.ref
->v
;
2983 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
2984 if (tcc_state
->ms_extensions
== 0)
2985 expect("identifier");
2989 if (type_size(&type1
, &align
) < 0) {
2990 if ((a
== TOK_STRUCT
) && (type1
.t
& VT_ARRAY
) && c
)
2993 tcc_error("field '%s' has incomplete type",
2994 get_tok_str(v
, NULL
));
2996 if ((type1
.t
& VT_BTYPE
) == VT_FUNC
||
2997 (type1
.t
& (VT_TYPEDEF
| VT_STATIC
| VT_EXTERN
| VT_INLINE
)))
2998 tcc_error("invalid type for '%s'",
2999 get_tok_str(v
, NULL
));
3003 bit_size
= expr_const();
3004 /* XXX: handle v = 0 case for messages */
3006 tcc_error("negative width in bit-field '%s'",
3007 get_tok_str(v
, NULL
));
3008 if (v
&& bit_size
== 0)
3009 tcc_error("zero width for bit-field '%s'",
3010 get_tok_str(v
, NULL
));
3012 size
= type_size(&type1
, &align
);
3014 if (align
< ad
.a
.aligned
)
3015 align
= ad
.a
.aligned
;
3016 } else if (ad
.a
.packed
) {
3018 } else if (*tcc_state
->pack_stack_ptr
) {
3019 if (align
> *tcc_state
->pack_stack_ptr
)
3020 align
= *tcc_state
->pack_stack_ptr
;
3023 if (bit_size
>= 0) {
3024 bt
= type1
.t
& VT_BTYPE
;
3031 tcc_error("bitfields must have scalar type");
3033 if (bit_size
> bsize
) {
3034 tcc_error("width of '%s' exceeds its type",
3035 get_tok_str(v
, NULL
));
3036 } else if (bit_size
== bsize
) {
3037 /* no need for bit fields */
3039 } else if (bit_size
== 0) {
3040 /* XXX: what to do if only padding in a
3042 /* zero size: means to pad */
3045 /* we do not have enough room ?
3046 did the type change?
3048 if ((bit_pos
+ bit_size
) > bsize
||
3049 bt
!= prevbt
|| a
== TOK_UNION
)
3052 /* XXX: handle LSB first */
3053 type1
.t
|= VT_BITFIELD
|
3054 (bit_pos
<< VT_STRUCT_SHIFT
) |
3055 (bit_size
<< (VT_STRUCT_SHIFT
+ 6));
3056 bit_pos
+= bit_size
;
3062 if (v
!= 0 || (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
3063 /* add new memory data only if starting
3065 if (lbit_pos
== 0) {
3066 if (a
== TOK_STRUCT
) {
3067 c
= (c
+ align
- 1) & -align
;
3076 if (align
> maxalign
)
3080 printf("add field %s offset=%d",
3081 get_tok_str(v
, NULL
), offset
);
3082 if (type1
.t
& VT_BITFIELD
) {
3083 printf(" pos=%d size=%d",
3084 (type1
.t
>> VT_STRUCT_SHIFT
) & 0x3f,
3085 (type1
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f);
3090 if (v
== 0 && (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
3092 while ((ass
= ass
->next
) != NULL
) {
3093 ss
= sym_push(ass
->v
, &ass
->type
, 0, offset
+ ass
->c
);
3098 ss
= sym_push(v
| SYM_FIELD
, &type1
, 0, offset
);
3102 if (tok
== ';' || tok
== TOK_EOF
)
3109 /* store size and alignment */
3110 s
->c
= (c
+ maxalign
- 1) & -maxalign
;
3116 /* return 1 if basic type is a type size (short, long, long long) */
3117 ST_FUNC
int is_btype_size(int bt
)
3119 return bt
== VT_SHORT
|| bt
== VT_LONG
|| bt
== VT_LLONG
;
3122 /* return 0 if no type declaration. otherwise, return the basic type
3125 static int parse_btype(CType
*type
, AttributeDef
*ad
)
3127 int t
, u
, bt_size
, complete
, type_found
, typespec_found
;
3131 memset(ad
, 0, sizeof(AttributeDef
));
3139 /* currently, we really ignore extension */
3150 tcc_error("too many basic types");
3152 bt_size
= is_btype_size (u
& VT_BTYPE
);
3153 if (u
== VT_INT
|| (!bt_size
&& !(t
& VT_TYPEDEF
)))
3168 if ((t
& VT_BTYPE
) == VT_DOUBLE
) {
3169 #ifndef TCC_TARGET_PE
3170 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3172 } else if ((t
& VT_BTYPE
) == VT_LONG
) {
3173 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3179 #ifdef TCC_TARGET_ARM64
3181 /* GCC's __uint128_t appears in some Linux header files. Make it a
3182 synonym for long double to get the size and alignment right. */
3194 if ((t
& VT_BTYPE
) == VT_LONG
) {
3195 #ifdef TCC_TARGET_PE
3196 t
= (t
& ~VT_BTYPE
) | VT_DOUBLE
;
3198 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3206 struct_decl(&type1
, VT_ENUM
, t
& (VT_TYPEDEF
| VT_EXTERN
));
3209 type
->ref
= type1
.ref
;
3213 struct_decl(&type1
, VT_STRUCT
, t
& (VT_TYPEDEF
| VT_EXTERN
));
3216 /* type modifiers */
3232 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == (VT_DEFSIGN
|VT_UNSIGNED
))
3233 tcc_error("signed and unsigned modifier");
3246 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == VT_DEFSIGN
)
3247 tcc_error("signed and unsigned modifier");
3248 t
|= VT_DEFSIGN
| VT_UNSIGNED
;
3273 /* GNUC attribute */
3274 case TOK_ATTRIBUTE1
:
3275 case TOK_ATTRIBUTE2
:
3276 parse_attribute(ad
);
3279 t
= (t
& ~VT_BTYPE
) | u
;
3287 parse_expr_type(&type1
);
3288 /* remove all storage modifiers except typedef */
3289 type1
.t
&= ~(VT_STORAGE
&~VT_TYPEDEF
);
3295 if (!s
|| !(s
->type
.t
& VT_TYPEDEF
))
3297 t
|= (s
->type
.t
& ~VT_TYPEDEF
);
3298 type
->ref
= s
->type
.ref
;
3300 /* get attributes from typedef */
3301 if (0 == ad
->a
.aligned
)
3302 ad
->a
.aligned
= s
->a
.aligned
;
3303 if (0 == ad
->a
.func_call
)
3304 ad
->a
.func_call
= s
->a
.func_call
;
3305 ad
->a
.packed
|= s
->a
.packed
;
3314 if (tcc_state
->char_is_unsigned
) {
3315 if ((t
& (VT_DEFSIGN
|VT_BTYPE
)) == VT_BYTE
)
3319 /* long is never used as type */
3320 if ((t
& VT_BTYPE
) == VT_LONG
)
3321 #if (!defined TCC_TARGET_X86_64 && !defined TCC_TARGET_ARM64) || \
3322 defined TCC_TARGET_PE
3323 t
= (t
& ~VT_BTYPE
) | VT_INT
;
3325 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3331 /* convert a function parameter type (array to pointer and function to
3332 function pointer) */
3333 static inline void convert_parameter_type(CType
*pt
)
3335 /* remove const and volatile qualifiers (XXX: const could be used
3336 to indicate a const function parameter */
3337 pt
->t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3338 /* array must be transformed to pointer according to ANSI C */
3340 if ((pt
->t
& VT_BTYPE
) == VT_FUNC
) {
3345 ST_FUNC
void parse_asm_str(CString
*astr
)
3348 /* read the string */
3350 expect("string constant");
3352 while (tok
== TOK_STR
) {
3353 /* XXX: add \0 handling too ? */
3354 cstr_cat(astr
, tokc
.cstr
->data
);
3357 cstr_ccat(astr
, '\0');
3360 /* Parse an asm label and return the label
3361 * Don't forget to free the CString in the caller! */
3362 static void asm_label_instr(CString
*astr
)
3365 parse_asm_str(astr
);
3368 printf("asm_alias: \"%s\"\n", (char *)astr
->data
);
3372 static void post_type(CType
*type
, AttributeDef
*ad
)
3374 int n
, l
, t1
, arg_size
, align
;
3375 Sym
**plast
, *s
, *first
;
3380 /* function declaration */
3388 /* read param name and compute offset */
3389 if (l
!= FUNC_OLD
) {
3390 if (!parse_btype(&pt
, &ad1
)) {
3392 tcc_error("invalid type");
3399 if ((pt
.t
& VT_BTYPE
) == VT_VOID
&& tok
== ')')
3401 type_decl(&pt
, &ad1
, &n
, TYPE_DIRECT
| TYPE_ABSTRACT
);
3402 if ((pt
.t
& VT_BTYPE
) == VT_VOID
)
3403 tcc_error("parameter declared as void");
3404 arg_size
+= (type_size(&pt
, &align
) + PTR_SIZE
- 1) / PTR_SIZE
;
3409 expect("identifier");
3413 convert_parameter_type(&pt
);
3414 s
= sym_push(n
| SYM_FIELD
, &pt
, 0, 0);
3420 if (l
== FUNC_NEW
&& tok
== TOK_DOTS
) {
3427 /* if no parameters, then old type prototype */
3431 /* NOTE: const is ignored in returned type as it has a special
3432 meaning in gcc / C++ */
3433 type
->t
&= ~VT_CONSTANT
;
3434 /* some ancient pre-K&R C allows a function to return an array
3435 and the array brackets to be put after the arguments, such
3436 that "int c()[]" means something like "int[] c()" */
3439 skip(']'); /* only handle simple "[]" */
3442 /* we push a anonymous symbol which will contain the function prototype */
3443 ad
->a
.func_args
= arg_size
;
3444 s
= sym_push(SYM_FIELD
, type
, 0, l
);
3449 } else if (tok
== '[') {
3450 /* array definition */
3452 if (tok
== TOK_RESTRICT1
)
3457 if (!local_stack
|| nocode_wanted
)
3458 vpushi(expr_const());
3460 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3463 tcc_error("invalid array size");
3465 if (!is_integer_btype(vtop
->type
.t
& VT_BTYPE
))
3466 tcc_error("size of variable length array should be an integer");
3471 /* parse next post type */
3472 post_type(type
, ad
);
3473 if (type
->t
== VT_FUNC
)
3474 tcc_error("declaration of an array of functions");
3475 t1
|= type
->t
& VT_VLA
;
3478 loc
-= type_size(&int_type
, &align
);
3482 vla_runtime_type_size(type
, &align
);
3484 vset(&int_type
, VT_LOCAL
|VT_LVAL
, n
);
3491 /* we push an anonymous symbol which will contain the array
3493 s
= sym_push(SYM_FIELD
, type
, 0, n
);
3494 type
->t
= (t1
? VT_VLA
: VT_ARRAY
) | VT_PTR
;
3499 /* Parse a type declaration (except basic type), and return the type
3500 in 'type'. 'td' is a bitmask indicating which kind of type decl is
3501 expected. 'type' should contain the basic type. 'ad' is the
3502 attribute definition of the basic type. It can be modified by
3505 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
)
3508 CType type1
, *type2
;
3509 int qualifiers
, storage
;
3511 while (tok
== '*') {
3519 qualifiers
|= VT_CONSTANT
;
3524 qualifiers
|= VT_VOLATILE
;
3532 type
->t
|= qualifiers
;
3535 /* XXX: clarify attribute handling */
3536 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3537 parse_attribute(ad
);
3539 /* recursive type */
3540 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
3541 type1
.t
= 0; /* XXX: same as int */
3544 /* XXX: this is not correct to modify 'ad' at this point, but
3545 the syntax is not clear */
3546 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3547 parse_attribute(ad
);
3548 type_decl(&type1
, ad
, v
, td
);
3551 /* type identifier */
3552 if (tok
>= TOK_IDENT
&& (td
& TYPE_DIRECT
)) {
3556 if (!(td
& TYPE_ABSTRACT
))
3557 expect("identifier");
3561 storage
= type
->t
& VT_STORAGE
;
3562 type
->t
&= ~VT_STORAGE
;
3563 if (storage
& VT_STATIC
) {
3564 int saved_nocode_wanted
= nocode_wanted
;
3566 post_type(type
, ad
);
3567 nocode_wanted
= saved_nocode_wanted
;
3569 post_type(type
, ad
);
3571 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3572 parse_attribute(ad
);
3576 /* append type at the end of type1 */
3589 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
3590 ST_FUNC
int lvalue_type(int t
)
3595 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
3597 else if (bt
== VT_SHORT
)
3601 if (t
& VT_UNSIGNED
)
3602 r
|= VT_LVAL_UNSIGNED
;
3606 /* indirection with full error checking and bound check */
3607 ST_FUNC
void indir(void)
3609 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
) {
3610 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FUNC
)
3614 if ((vtop
->r
& VT_LVAL
) && !nocode_wanted
)
3616 vtop
->type
= *pointed_type(&vtop
->type
);
3617 /* Arrays and functions are never lvalues */
3618 if (!(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_VLA
)
3619 && (vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
3620 vtop
->r
|= lvalue_type(vtop
->type
.t
);
3621 /* if bound checking, the referenced pointer must be checked */
3622 #ifdef CONFIG_TCC_BCHECK
3623 if (tcc_state
->do_bounds_check
)
3624 vtop
->r
|= VT_MUSTBOUND
;
3629 /* pass a parameter to a function and do type checking and casting */
3630 static void gfunc_param_typed(Sym
*func
, Sym
*arg
)
3635 func_type
= func
->c
;
3636 if (func_type
== FUNC_OLD
||
3637 (func_type
== FUNC_ELLIPSIS
&& arg
== NULL
)) {
3638 /* default casting : only need to convert float to double */
3639 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
) {
3642 } else if (vtop
->type
.t
& VT_BITFIELD
) {
3643 type
.t
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
3646 } else if (arg
== NULL
) {
3647 tcc_error("too many arguments to function");
3650 type
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
3651 gen_assign_cast(&type
);
3655 /* parse an expression of the form '(type)' or '(expr)' and return its
3657 static void parse_expr_type(CType
*type
)
3663 if (parse_btype(type
, &ad
)) {
3664 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3671 static void parse_type(CType
*type
)
3676 if (!parse_btype(type
, &ad
)) {
3679 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3682 static void vpush_tokc(int t
)
3687 vsetc(&type
, VT_CONST
, &tokc
);
3690 ST_FUNC
void unary(void)
3692 int n
, t
, align
, size
, r
, sizeof_caller
;
3696 static int in_sizeof
= 0;
3698 sizeof_caller
= in_sizeof
;
3700 /* XXX: GCC 2.95.3 does not generate a table although it should be
3714 vpush_tokc(VT_INT
| VT_UNSIGNED
);
3718 vpush_tokc(VT_LLONG
);
3722 vpush_tokc(VT_LLONG
| VT_UNSIGNED
);
3726 vpush_tokc(VT_FLOAT
);
3730 vpush_tokc(VT_DOUBLE
);
3734 vpush_tokc(VT_LDOUBLE
);
3737 case TOK___FUNCTION__
:
3739 goto tok_identifier
;
3745 /* special function name identifier */
3746 len
= strlen(funcname
) + 1;
3747 /* generate char[len] type */
3752 vpush_ref(&type
, data_section
, data_section
->data_offset
, len
);
3753 ptr
= section_ptr_add(data_section
, len
);
3754 memcpy(ptr
, funcname
, len
);
3759 #ifdef TCC_TARGET_PE
3760 t
= VT_SHORT
| VT_UNSIGNED
;
3766 /* string parsing */
3769 if (tcc_state
->warn_write_strings
)
3774 memset(&ad
, 0, sizeof(AttributeDef
));
3775 decl_initializer_alloc(&type
, &ad
, VT_CONST
, 2, 0, NULL
, 0);
3780 if (parse_btype(&type
, &ad
)) {
3781 type_decl(&type
, &ad
, &n
, TYPE_ABSTRACT
);
3783 /* check ISOC99 compound literal */
3785 /* data is allocated locally by default */
3790 /* all except arrays are lvalues */
3791 if (!(type
.t
& VT_ARRAY
))
3792 r
|= lvalue_type(type
.t
);
3793 memset(&ad
, 0, sizeof(AttributeDef
));
3794 decl_initializer_alloc(&type
, &ad
, r
, 1, 0, NULL
, 0);
3796 if (sizeof_caller
) {
3803 } else if (tok
== '{') {
3806 tcc_error("statement expression in global scope"); */
3807 /* this check breaks compilation of the linux 2.4.26 with the meesage:
3808 linux/include/net/tcp.h:945: error: statement expression in global scope */
3810 /* save all registers */
3812 /* statement expression : we do not accept break/continue
3813 inside as GCC does */
3814 block(NULL
, NULL
, NULL
, NULL
, 0, 1);
3829 /* functions names must be treated as function pointers,
3830 except for unary '&' and sizeof. Since we consider that
3831 functions are not lvalues, we only have to handle it
3832 there and in function calls. */
3833 /* arrays can also be used although they are not lvalues */
3834 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
&&
3835 !(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_LLOCAL
))
3837 mk_pointer(&vtop
->type
);
3843 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3845 boolean
.t
= VT_BOOL
;
3847 vtop
->c
.i
= !vtop
->c
.i
;
3848 } else if ((vtop
->r
& VT_VALMASK
) == VT_CMP
)
3849 vtop
->c
.i
= vtop
->c
.i
^ 1;
3850 else if (!nocode_wanted
) {
3852 vseti(VT_JMP
, gvtst(1, 0));
3866 if ((vtop
->type
.t
& VT_BTYPE
) == VT_PTR
)
3867 tcc_error("pointer not accepted for unary plus");
3868 /* In order to force cast, we add zero, except for floating point
3869 where we really need an noop (otherwise -0.0 will be transformed
3871 if (!is_float(vtop
->type
.t
)) {
3882 unary_type(&type
); // Perform a in_sizeof = 0;
3883 size
= type_size(&type
, &align
);
3884 if (t
== TOK_SIZEOF
) {
3885 if (!(type
.t
& VT_VLA
)) {
3887 tcc_error("sizeof applied to an incomplete type");
3890 vla_runtime_type_size(&type
, &align
);
3895 vtop
->type
.t
|= VT_UNSIGNED
;
3898 case TOK_builtin_types_compatible_p
:
3907 type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3908 type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3909 vpushi(is_compatible_types(&type1
, &type2
));
3912 case TOK_builtin_constant_p
:
3914 int saved_nocode_wanted
, res
;
3917 saved_nocode_wanted
= nocode_wanted
;
3920 res
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
3922 nocode_wanted
= saved_nocode_wanted
;
3927 case TOK_builtin_frame_address
:
3928 case TOK_builtin_return_address
:
3935 if (tok
!= TOK_CINT
|| tokc
.i
< 0) {
3936 tcc_error("%s only takes positive integers",
3937 tok1
== TOK_builtin_return_address
?
3938 "__builtin_return_address" :
3939 "__builtin_frame_address");
3946 vset(&type
, VT_LOCAL
, 0); /* local frame */
3948 mk_pointer(&vtop
->type
);
3949 indir(); /* -> parent frame */
3951 if (tok1
== TOK_builtin_return_address
) {
3952 // assume return address is just above frame pointer on stack
3955 mk_pointer(&vtop
->type
);
3960 #ifdef TCC_TARGET_X86_64
3961 #ifdef TCC_TARGET_PE
3962 case TOK_builtin_va_start
:
3970 if ((vtop
->r
& VT_VALMASK
) != VT_LOCAL
)
3971 tcc_error("__builtin_va_start expects a local variable");
3972 vtop
->r
&= ~(VT_LVAL
| VT_REF
);
3973 vtop
->type
= char_pointer_type
;
3978 case TOK_builtin_va_arg_types
:
3985 vpushi(classify_x86_64_va_arg(&type
));
3991 #ifdef TCC_TARGET_ARM64
3992 case TOK___va_start
: {
3994 tcc_error("statement in global scope");
4004 vtop
->type
.t
= VT_VOID
;
4007 case TOK___va_arg
: {
4009 tcc_error("statement in global scope");
4022 case TOK___arm64_clear_cache
: {
4031 vtop
->type
.t
= VT_VOID
;
4035 /* pre operations */
4046 t
= vtop
->type
.t
& VT_BTYPE
;
4048 /* In IEEE negate(x) isn't subtract(0,x), but rather
4053 else if (t
== VT_DOUBLE
)
4064 goto tok_identifier
;
4066 /* allow to take the address of a label */
4067 if (tok
< TOK_UIDENT
)
4068 expect("label identifier");
4069 s
= label_find(tok
);
4071 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
4073 if (s
->r
== LABEL_DECLARED
)
4074 s
->r
= LABEL_FORWARD
;
4077 s
->type
.t
= VT_VOID
;
4078 mk_pointer(&s
->type
);
4079 s
->type
.t
|= VT_STATIC
;
4081 vpushsym(&s
->type
, s
);
4085 // special qnan , snan and infinity values
4087 vpush64(VT_DOUBLE
, 0x7ff8000000000000ULL
);
4091 vpush64(VT_DOUBLE
, 0x7ff0000000000001ULL
);
4095 vpush64(VT_DOUBLE
, 0x7ff0000000000000ULL
);
4104 expect("identifier");
4107 const char *name
= get_tok_str(t
, NULL
);
4109 tcc_error("'%s' undeclared", name
);
4110 /* for simple function calls, we tolerate undeclared
4111 external reference to int() function */
4112 if (tcc_state
->warn_implicit_function_declaration
4113 #ifdef TCC_TARGET_PE
4114 /* people must be warned about using undeclared WINAPI functions
4115 (which usually start with uppercase letter) */
4116 || (name
[0] >= 'A' && name
[0] <= 'Z')
4119 tcc_warning("implicit declaration of function '%s'", name
);
4120 s
= external_global_sym(t
, &func_old_type
, 0);
4122 if ((s
->type
.t
& (VT_STATIC
| VT_INLINE
| VT_BTYPE
)) ==
4123 (VT_STATIC
| VT_INLINE
| VT_FUNC
)) {
4124 /* if referencing an inline function, then we generate a
4125 symbol to it if not already done. It will have the
4126 effect to generate code for it at the end of the
4127 compilation unit. Inline function as always
4128 generated in the text section. */
4130 put_extern_sym(s
, text_section
, 0, 0);
4131 r
= VT_SYM
| VT_CONST
;
4135 vset(&s
->type
, r
, s
->c
);
4136 /* if forward reference, we must point to s */
4137 if (vtop
->r
& VT_SYM
) {
4139 vtop
->c
.ptr_offset
= 0;
4144 /* post operations */
4146 if (tok
== TOK_INC
|| tok
== TOK_DEC
) {
4149 } else if (tok
== '.' || tok
== TOK_ARROW
) {
4152 if (tok
== TOK_ARROW
)
4154 qualifiers
= vtop
->type
.t
& (VT_CONSTANT
| VT_VOLATILE
);
4158 /* expect pointer on structure */
4159 if ((vtop
->type
.t
& VT_BTYPE
) != VT_STRUCT
)
4160 expect("struct or union");
4164 while ((s
= s
->next
) != NULL
) {
4169 tcc_error("field not found: %s", get_tok_str(tok
& ~SYM_FIELD
, NULL
));
4170 /* add field offset to pointer */
4171 vtop
->type
= char_pointer_type
; /* change type to 'char *' */
4174 /* change type to field type, and set to lvalue */
4175 vtop
->type
= s
->type
;
4176 vtop
->type
.t
|= qualifiers
;
4177 /* an array is never an lvalue */
4178 if (!(vtop
->type
.t
& VT_ARRAY
)) {
4179 vtop
->r
|= lvalue_type(vtop
->type
.t
);
4180 #ifdef CONFIG_TCC_BCHECK
4181 /* if bound checking, the referenced pointer must be checked */
4182 if (tcc_state
->do_bounds_check
)
4183 vtop
->r
|= VT_MUSTBOUND
;
4187 } else if (tok
== '[') {
4193 } else if (tok
== '(') {
4196 int nb_args
, ret_nregs
, ret_align
, regsize
, variadic
;
4199 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
4200 /* pointer test (no array accepted) */
4201 if ((vtop
->type
.t
& (VT_BTYPE
| VT_ARRAY
)) == VT_PTR
) {
4202 vtop
->type
= *pointed_type(&vtop
->type
);
4203 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
)
4207 expect("function pointer");
4210 vtop
->r
&= ~VT_LVAL
; /* no lvalue */
4212 /* get return type */
4215 sa
= s
->next
; /* first parameter */
4218 /* compute first implicit argument if a structure is returned */
4219 if ((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
4220 variadic
= (s
->c
== FUNC_ELLIPSIS
);
4221 ret_nregs
= gfunc_sret(&s
->type
, variadic
, &ret
.type
,
4222 &ret_align
, ®size
);
4224 /* get some space for the returned structure */
4225 size
= type_size(&s
->type
, &align
);
4226 #ifdef TCC_TARGET_ARM64
4227 /* On arm64, a small struct is return in registers.
4228 It is much easier to write it to memory if we know
4229 that we are allowed to write some extra bytes, so
4230 round the allocated space up to a power of 2: */
4232 while (size
& (size
- 1))
4233 size
= (size
| (size
- 1)) + 1;
4235 loc
= (loc
- size
) & -align
;
4237 ret
.r
= VT_LOCAL
| VT_LVAL
;
4238 /* pass it as 'int' to avoid structure arg passing
4240 vseti(VT_LOCAL
, loc
);
4250 /* return in register */
4251 if (is_float(ret
.type
.t
)) {
4252 ret
.r
= reg_fret(ret
.type
.t
);
4253 #ifdef TCC_TARGET_X86_64
4254 if ((ret
.type
.t
& VT_BTYPE
) == VT_QFLOAT
)
4258 #ifndef TCC_TARGET_ARM64
4259 #ifdef TCC_TARGET_X86_64
4260 if ((ret
.type
.t
& VT_BTYPE
) == VT_QLONG
)
4262 if ((ret
.type
.t
& VT_BTYPE
) == VT_LLONG
)
4273 gfunc_param_typed(s
, sa
);
4283 tcc_error("too few arguments to function");
4285 if (!nocode_wanted
) {
4286 gfunc_call(nb_args
);
4288 vtop
-= (nb_args
+ 1);
4292 for (r
= ret
.r
+ ret_nregs
+ !ret_nregs
; r
-- > ret
.r
;) {
4293 vsetc(&ret
.type
, r
, &ret
.c
);
4294 vtop
->r2
= ret
.r2
; /* Loop only happens when r2 is VT_CONST */
4297 /* handle packed struct return */
4298 if (((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) && ret_nregs
) {
4301 size
= type_size(&s
->type
, &align
);
4302 /* We're writing whole regs often, make sure there's enough
4303 space. Assume register size is power of 2. */
4304 if (regsize
> align
)
4306 loc
= (loc
- size
) & -align
;
4310 vset(&ret
.type
, VT_LOCAL
| VT_LVAL
, addr
+ offset
);
4314 if (--ret_nregs
== 0)
4318 vset(&s
->type
, VT_LOCAL
| VT_LVAL
, addr
);
4326 ST_FUNC
void expr_prod(void)
4331 while (tok
== '*' || tok
== '/' || tok
== '%') {
4339 ST_FUNC
void expr_sum(void)
4344 while (tok
== '+' || tok
== '-') {
4352 static void expr_shift(void)
4357 while (tok
== TOK_SHL
|| tok
== TOK_SAR
) {
4365 static void expr_cmp(void)
4370 while ((tok
>= TOK_ULE
&& tok
<= TOK_GT
) ||
4371 tok
== TOK_ULT
|| tok
== TOK_UGE
) {
4379 static void expr_cmpeq(void)
4384 while (tok
== TOK_EQ
|| tok
== TOK_NE
) {
4392 static void expr_and(void)
4395 while (tok
== '&') {
4402 static void expr_xor(void)
4405 while (tok
== '^') {
4412 static void expr_or(void)
4415 while (tok
== '|') {
4422 /* XXX: fix this mess */
4423 static void expr_land_const(void)
4426 while (tok
== TOK_LAND
) {
4433 /* XXX: fix this mess */
4434 static void expr_lor_const(void)
4437 while (tok
== TOK_LOR
) {
4444 /* only used if non constant */
4445 static void expr_land(void)
4450 if (tok
== TOK_LAND
) {
4455 if (tok
!= TOK_LAND
) {
4465 static void expr_lor(void)
4470 if (tok
== TOK_LOR
) {
4475 if (tok
!= TOK_LOR
) {
4485 /* XXX: better constant handling */
4486 static void expr_cond(void)
4488 int tt
, u
, r1
, r2
, rc
, t1
, t2
, bt1
, bt2
;
4490 CType type
, type1
, type2
;
4497 boolean
.t
= VT_BOOL
;
4503 if (tok
!= ':' || !gnu_ext
) {
4518 if (vtop
!= vstack
) {
4519 /* needed to avoid having different registers saved in
4521 if (is_float(vtop
->type
.t
)) {
4523 #ifdef TCC_TARGET_X86_64
4524 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4534 if (tok
== ':' && gnu_ext
) {
4542 sv
= *vtop
; /* save value to handle it later */
4543 vtop
--; /* no vpop so that FP stack is not flushed */
4551 bt1
= t1
& VT_BTYPE
;
4553 bt2
= t2
& VT_BTYPE
;
4554 /* cast operands to correct type according to ISOC rules */
4555 if (is_float(bt1
) || is_float(bt2
)) {
4556 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
4557 type
.t
= VT_LDOUBLE
;
4558 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
4563 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
4564 /* cast to biggest op */
4566 /* convert to unsigned if it does not fit in a long long */
4567 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
4568 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
4569 type
.t
|= VT_UNSIGNED
;
4570 } else if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
4571 /* If one is a null ptr constant the result type
4573 if (is_null_pointer (vtop
))
4575 else if (is_null_pointer (&sv
))
4577 /* XXX: test pointer compatibility, C99 has more elaborate
4581 } else if (bt1
== VT_FUNC
|| bt2
== VT_FUNC
) {
4582 /* XXX: test function pointer compatibility */
4583 type
= bt1
== VT_FUNC
? type1
: type2
;
4584 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
4585 /* XXX: test structure compatibility */
4586 type
= bt1
== VT_STRUCT
? type1
: type2
;
4587 } else if (bt1
== VT_VOID
|| bt2
== VT_VOID
) {
4588 /* NOTE: as an extension, we accept void on only one side */
4591 /* integer operations */
4593 /* convert to unsigned if it does not fit in an integer */
4594 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
4595 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
4596 type
.t
|= VT_UNSIGNED
;
4599 /* now we convert second operand */
4601 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4604 if (is_float(type
.t
)) {
4606 #ifdef TCC_TARGET_X86_64
4607 if ((type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4611 } else if ((type
.t
& VT_BTYPE
) == VT_LLONG
) {
4612 /* for long longs, we use fixed registers to avoid having
4613 to handle a complicated move */
4618 /* this is horrible, but we must also convert first
4622 /* put again first value and cast it */
4625 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4628 move_reg(r2
, r1
, type
.t
);
4635 static void expr_eq(void)
4641 (tok
>= TOK_A_MOD
&& tok
<= TOK_A_DIV
) ||
4642 tok
== TOK_A_XOR
|| tok
== TOK_A_OR
||
4643 tok
== TOK_A_SHL
|| tok
== TOK_A_SAR
) {
4658 ST_FUNC
void gexpr(void)
4669 /* parse an expression and return its type without any side effect. */
4670 static void expr_type(CType
*type
)
4672 int saved_nocode_wanted
;
4674 saved_nocode_wanted
= nocode_wanted
;
4679 nocode_wanted
= saved_nocode_wanted
;
4682 /* parse a unary expression and return its type without any side
4684 static void unary_type(CType
*type
)
4696 /* parse a constant expression and return value in vtop. */
4697 static void expr_const1(void)
4706 /* parse an integer constant and return its value. */
4707 ST_FUNC
int expr_const(void)
4711 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
4712 expect("constant expression");
4718 /* return the label token if current token is a label, otherwise
4720 static int is_label(void)
4724 /* fast test first */
4725 if (tok
< TOK_UIDENT
)
4727 /* no need to save tokc because tok is an identifier */
4734 unget_tok(last_tok
);
4739 static void label_or_decl(int l
)
4743 /* fast test first */
4744 if (tok
>= TOK_UIDENT
)
4746 /* no need to save tokc because tok is an identifier */
4750 unget_tok(last_tok
);
4753 unget_tok(last_tok
);
4758 static void block(int *bsym
, int *csym
, int *case_sym
, int *def_sym
,
4759 int case_reg
, int is_expr
)
4762 Sym
*s
, *frame_bottom
;
4764 /* generate line number info */
4765 if (tcc_state
->do_debug
&&
4766 (last_line_num
!= file
->line_num
|| last_ind
!= ind
)) {
4767 put_stabn(N_SLINE
, 0, file
->line_num
, ind
- func_ind
);
4769 last_line_num
= file
->line_num
;
4773 /* default return value is (void) */
4775 vtop
->type
.t
= VT_VOID
;
4778 if (tok
== TOK_IF
) {
4785 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4787 if (c
== TOK_ELSE
) {
4791 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4792 gsym(d
); /* patch else jmp */
4795 } else if (tok
== TOK_WHILE
) {
4804 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4808 } else if (tok
== '{') {
4810 int block_vla_sp_loc
= vla_sp_loc
, saved_vlas_in_scope
= vlas_in_scope
;
4813 /* record local declaration stack position */
4815 frame_bottom
= sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
4816 frame_bottom
->next
= scope_stack_bottom
;
4817 scope_stack_bottom
= frame_bottom
;
4818 llabel
= local_label_stack
;
4820 /* handle local labels declarations */
4821 if (tok
== TOK_LABEL
) {
4824 if (tok
< TOK_UIDENT
)
4825 expect("label identifier");
4826 label_push(&local_label_stack
, tok
, LABEL_DECLARED
);
4836 while (tok
!= '}') {
4837 label_or_decl(VT_LOCAL
);
4841 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
4844 /* pop locally defined labels */
4845 label_pop(&local_label_stack
, llabel
);
4847 /* XXX: this solution makes only valgrind happy...
4848 triggered by gcc.c-torture/execute/20000917-1.c */
4850 switch(vtop
->type
.t
& VT_BTYPE
) {
4852 /* this breaks a compilation of the linux kernel v2.4.26 */
4853 /* pmd_t *new = ({ __asm__ __volatile__("ud2\n") ; ((pmd_t *)1); }); */
4854 /* Look a commit a80acab: Display error on statement expressions with complex return type */
4855 /* A pointer is not a complex return type */
4859 for(p
=vtop
->type
.ref
;p
;p
=p
->prev
)
4861 tcc_error("unsupported expression type");
4864 /* pop locally defined symbols */
4865 scope_stack_bottom
= scope_stack_bottom
->next
;
4866 sym_pop(&local_stack
, s
);
4868 /* Pop VLA frames and restore stack pointer if required */
4869 if (vlas_in_scope
> saved_vlas_in_scope
) {
4870 vla_sp_loc
= saved_vlas_in_scope
? block_vla_sp_loc
: vla_sp_root_loc
;
4873 vlas_in_scope
= saved_vlas_in_scope
;
4876 } else if (tok
== TOK_RETURN
) {
4880 gen_assign_cast(&func_vt
);
4881 #ifdef TCC_TARGET_ARM64
4882 // Perhaps it would be better to use this for all backends:
4885 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
4886 CType type
, ret_type
;
4887 int ret_align
, ret_nregs
, regsize
;
4888 ret_nregs
= gfunc_sret(&func_vt
, func_var
, &ret_type
,
4889 &ret_align
, ®size
);
4890 if (0 == ret_nregs
) {
4891 /* if returning structure, must copy it to implicit
4892 first pointer arg location */
4895 vset(&type
, VT_LOCAL
| VT_LVAL
, func_vc
);
4898 /* copy structure value to pointer */
4901 /* returning structure packed into registers */
4902 int r
, size
, addr
, align
;
4903 size
= type_size(&func_vt
,&align
);
4904 if ((vtop
->r
!= (VT_LOCAL
| VT_LVAL
) || (vtop
->c
.i
& (ret_align
-1)))
4905 && (align
& (ret_align
-1))) {
4906 loc
= (loc
- size
) & -ret_align
;
4909 vset(&type
, VT_LOCAL
| VT_LVAL
, addr
);
4913 vset(&ret_type
, VT_LOCAL
| VT_LVAL
, addr
);
4915 vtop
->type
= ret_type
;
4916 if (is_float(ret_type
.t
))
4917 r
= rc_fret(ret_type
.t
);
4923 if (--ret_nregs
== 0)
4925 /* We assume that when a structure is returned in multiple
4926 registers, their classes are consecutive values of the
4929 vtop
->c
.i
+= regsize
;
4930 vtop
->r
= VT_LOCAL
| VT_LVAL
;
4933 } else if (is_float(func_vt
.t
)) {
4934 gv(rc_fret(func_vt
.t
));
4939 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
4942 rsym
= gjmp(rsym
); /* jmp */
4943 } else if (tok
== TOK_BREAK
) {
4946 tcc_error("cannot break");
4947 *bsym
= gjmp(*bsym
);
4950 } else if (tok
== TOK_CONTINUE
) {
4953 tcc_error("cannot continue");
4954 vla_sp_restore_root();
4955 *csym
= gjmp(*csym
);
4958 } else if (tok
== TOK_FOR
) {
4963 frame_bottom
= sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
4964 frame_bottom
->next
= scope_stack_bottom
;
4965 scope_stack_bottom
= frame_bottom
;
4967 /* c99 for-loop init decl? */
4968 if (!decl0(VT_LOCAL
, 1)) {
4969 /* no, regular for-loop init expr */
4995 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4999 scope_stack_bottom
= scope_stack_bottom
->next
;
5000 sym_pop(&local_stack
, s
);
5002 if (tok
== TOK_DO
) {
5008 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
5019 if (tok
== TOK_SWITCH
) {
5023 /* XXX: other types than integer */
5024 case_reg
= gv(RC_INT
);
5028 b
= gjmp(0); /* jump to first case */
5030 block(&a
, csym
, &b
, &c
, case_reg
, 0);
5031 /* if no default, jmp after switch */
5039 if (tok
== TOK_CASE
) {
5046 if (gnu_ext
&& tok
== TOK_DOTS
) {
5050 tcc_warning("empty case range");
5052 /* since a case is like a label, we must skip it with a jmp */
5060 *case_sym
= gtst(1, 0);
5063 *case_sym
= gtst(1, 0);
5067 *case_sym
= gtst(1, *case_sym
);
5069 case_reg
= gv(RC_INT
);
5074 goto block_after_label
;
5076 if (tok
== TOK_DEFAULT
) {
5082 tcc_error("too many 'default'");
5085 goto block_after_label
;
5087 if (tok
== TOK_GOTO
) {
5089 if (tok
== '*' && gnu_ext
) {
5093 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
)
5096 } else if (tok
>= TOK_UIDENT
) {
5097 s
= label_find(tok
);
5098 /* put forward definition if needed */
5100 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
5102 if (s
->r
== LABEL_DECLARED
)
5103 s
->r
= LABEL_FORWARD
;
5105 vla_sp_restore_root();
5106 if (s
->r
& LABEL_FORWARD
)
5107 s
->jnext
= gjmp(s
->jnext
);
5109 gjmp_addr(s
->jnext
);
5112 expect("label identifier");
5115 } else if (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
) {
5123 if (s
->r
== LABEL_DEFINED
)
5124 tcc_error("duplicate label '%s'", get_tok_str(s
->v
, NULL
));
5126 s
->r
= LABEL_DEFINED
;
5128 s
= label_push(&global_label_stack
, b
, LABEL_DEFINED
);
5132 /* we accept this, but it is a mistake */
5135 tcc_warning("deprecated use of label at end of compound statement");
5139 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
5142 /* expression case */
5157 /* t is the array or struct type. c is the array or struct
5158 address. cur_index/cur_field is the pointer to the current
5159 value. 'size_only' is true if only size info is needed (only used
5161 static void decl_designator(CType
*type
, Section
*sec
, unsigned long c
,
5162 int *cur_index
, Sym
**cur_field
,
5166 int notfirst
, index
, index_last
, align
, l
, nb_elems
, elem_size
;
5172 if (gnu_ext
&& (l
= is_label()) != 0)
5174 while (tok
== '[' || tok
== '.') {
5176 if (!(type
->t
& VT_ARRAY
))
5177 expect("array type");
5180 index
= expr_const();
5181 if (index
< 0 || (s
->c
>= 0 && index
>= s
->c
))
5182 expect("invalid index");
5183 if (tok
== TOK_DOTS
&& gnu_ext
) {
5185 index_last
= expr_const();
5186 if (index_last
< 0 ||
5187 (s
->c
>= 0 && index_last
>= s
->c
) ||
5189 expect("invalid index");
5195 *cur_index
= index_last
;
5196 type
= pointed_type(type
);
5197 elem_size
= type_size(type
, &align
);
5198 c
+= index
* elem_size
;
5199 /* NOTE: we only support ranges for last designator */
5200 nb_elems
= index_last
- index
+ 1;
5201 if (nb_elems
!= 1) {
5210 if ((type
->t
& VT_BTYPE
) != VT_STRUCT
)
5211 expect("struct/union type");
5224 /* XXX: fix this mess by using explicit storage field */
5226 type1
.t
|= (type
->t
& ~VT_TYPE
);
5240 if (type
->t
& VT_ARRAY
) {
5242 type
= pointed_type(type
);
5243 c
+= index
* type_size(type
, &align
);
5247 tcc_error("too many field init");
5248 /* XXX: fix this mess by using explicit storage field */
5250 type1
.t
|= (type
->t
& ~VT_TYPE
);
5255 decl_initializer(type
, sec
, c
, 0, size_only
);
5257 /* XXX: make it more general */
5258 if (!size_only
&& nb_elems
> 1) {
5259 unsigned long c_end
;
5264 tcc_error("range init not supported yet for dynamic storage");
5265 c_end
= c
+ nb_elems
* elem_size
;
5266 if (c_end
> sec
->data_allocated
)
5267 section_realloc(sec
, c_end
);
5268 src
= sec
->data
+ c
;
5270 for(i
= 1; i
< nb_elems
; i
++) {
5272 memcpy(dst
, src
, elem_size
);
5278 #define EXPR_CONST 1
5281 /* store a value or an expression directly in global data or in local array */
5282 static void init_putv(CType
*type
, Section
*sec
, unsigned long c
,
5283 int v
, int expr_type
)
5285 int saved_global_expr
, bt
, bit_pos
, bit_size
;
5287 unsigned long long bit_mask
;
5295 /* compound literals must be allocated globally in this case */
5296 saved_global_expr
= global_expr
;
5299 global_expr
= saved_global_expr
;
5300 /* NOTE: symbols are accepted */
5301 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) != VT_CONST
)
5302 tcc_error("initializer element is not constant");
5310 dtype
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
5313 /* XXX: not portable */
5314 /* XXX: generate error if incorrect relocation */
5315 gen_assign_cast(&dtype
);
5316 bt
= type
->t
& VT_BTYPE
;
5317 /* we'll write at most 16 bytes */
5318 if (c
+ 16 > sec
->data_allocated
) {
5319 section_realloc(sec
, c
+ 16);
5321 ptr
= sec
->data
+ c
;
5322 /* XXX: make code faster ? */
5323 if (!(type
->t
& VT_BITFIELD
)) {
5328 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5329 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
5330 bit_mask
= (1LL << bit_size
) - 1;
5332 if ((vtop
->r
& VT_SYM
) &&
5338 (bt
== VT_INT
&& bit_size
!= 32)))
5339 tcc_error("initializer element is not computable at load time");
5341 /* XXX: when cross-compiling we assume that each type has the
5342 same representation on host and target, which is likely to
5343 be wrong in the case of long double */
5345 vtop
->c
.i
= (vtop
->c
.i
!= 0);
5347 *(char *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5350 *(short *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5353 *(double *)ptr
= vtop
->c
.d
;
5356 *(long double *)ptr
= vtop
->c
.ld
;
5359 *(long long *)ptr
|= (vtop
->c
.ll
& bit_mask
) << bit_pos
;
5362 addr_t val
= (vtop
->c
.ptr_offset
& bit_mask
) << bit_pos
;
5363 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
5364 if (vtop
->r
& VT_SYM
)
5365 greloca(sec
, vtop
->sym
, c
, R_DATA_PTR
, val
);
5367 *(addr_t
*)ptr
|= val
;
5369 if (vtop
->r
& VT_SYM
)
5370 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
5371 *(addr_t
*)ptr
|= val
;
5376 int val
= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5377 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
5378 if (vtop
->r
& VT_SYM
)
5379 greloca(sec
, vtop
->sym
, c
, R_DATA_PTR
, val
);
5383 if (vtop
->r
& VT_SYM
)
5384 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
5392 vset(&dtype
, VT_LOCAL
|VT_LVAL
, c
);
5399 /* put zeros for variable based init */
5400 static void init_putz(CType
*t
, Section
*sec
, unsigned long c
, int size
)
5403 /* nothing to do because globals are already set to zero */
5405 vpush_global_sym(&func_old_type
, TOK_memset
);
5407 #ifdef TCC_TARGET_ARM
5418 /* 't' contains the type and storage info. 'c' is the offset of the
5419 object in section 'sec'. If 'sec' is NULL, it means stack based
5420 allocation. 'first' is true if array '{' must be read (multi
5421 dimension implicit array init handling). 'size_only' is true if
5422 size only evaluation is wanted (only for arrays). */
5423 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
,
5424 int first
, int size_only
)
5426 int index
, array_length
, n
, no_oblock
, nb
, parlevel
, parlevel1
, i
;
5427 int size1
, align1
, expr_type
;
5431 if (type
->t
& VT_VLA
) {
5434 /* save current stack pointer */
5435 if (vlas_in_scope
== 0) {
5436 if (vla_sp_root_loc
== -1)
5437 vla_sp_root_loc
= (loc
-= PTR_SIZE
);
5438 gen_vla_sp_save(vla_sp_root_loc
);
5441 vla_runtime_type_size(type
, &a
);
5442 gen_vla_alloc(type
, a
);
5446 } else if (type
->t
& VT_ARRAY
) {
5450 t1
= pointed_type(type
);
5451 size1
= type_size(t1
, &align1
);
5454 if ((first
&& tok
!= TOK_LSTR
&& tok
!= TOK_STR
) ||
5457 tcc_error("character array initializer must be a literal,"
5458 " optionally enclosed in braces");
5463 /* only parse strings here if correct type (otherwise: handle
5464 them as ((w)char *) expressions */
5465 if ((tok
== TOK_LSTR
&&
5466 #ifdef TCC_TARGET_PE
5467 (t1
->t
& VT_BTYPE
) == VT_SHORT
&& (t1
->t
& VT_UNSIGNED
)
5469 (t1
->t
& VT_BTYPE
) == VT_INT
5471 ) || (tok
== TOK_STR
&& (t1
->t
& VT_BTYPE
) == VT_BYTE
)) {
5472 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5477 /* compute maximum number of chars wanted */
5479 cstr_len
= cstr
->size
;
5481 cstr_len
= cstr
->size
/ sizeof(nwchar_t
);
5484 if (n
>= 0 && nb
> (n
- array_length
))
5485 nb
= n
- array_length
;
5488 tcc_warning("initializer-string for array is too long");
5489 /* in order to go faster for common case (char
5490 string in global variable, we handle it
5492 if (sec
&& tok
== TOK_STR
&& size1
== 1) {
5493 memcpy(sec
->data
+ c
+ array_length
, cstr
->data
, nb
);
5497 ch
= ((unsigned char *)cstr
->data
)[i
];
5499 ch
= ((nwchar_t
*)cstr
->data
)[i
];
5500 init_putv(t1
, sec
, c
+ (array_length
+ i
) * size1
,
5508 /* only add trailing zero if enough storage (no
5509 warning in this case since it is standard) */
5510 if (n
< 0 || array_length
< n
) {
5512 init_putv(t1
, sec
, c
+ (array_length
* size1
), 0, EXPR_VAL
);
5518 while (tok
!= '}') {
5519 decl_designator(type
, sec
, c
, &index
, NULL
, size_only
);
5520 if (n
>= 0 && index
>= n
)
5521 tcc_error("index too large");
5522 /* must put zero in holes (note that doing it that way
5523 ensures that it even works with designators) */
5524 if (!size_only
&& array_length
< index
) {
5525 init_putz(t1
, sec
, c
+ array_length
* size1
,
5526 (index
- array_length
) * size1
);
5529 if (index
> array_length
)
5530 array_length
= index
;
5531 /* special test for multi dimensional arrays (may not
5532 be strictly correct if designators are used at the
5534 if (index
>= n
&& no_oblock
)
5543 /* put zeros at the end */
5544 if (!size_only
&& n
>= 0 && array_length
< n
) {
5545 init_putz(t1
, sec
, c
+ array_length
* size1
,
5546 (n
- array_length
) * size1
);
5548 /* patch type size if needed */
5550 s
->c
= array_length
;
5551 } else if ((type
->t
& VT_BTYPE
) == VT_STRUCT
&&
5552 (sec
|| !first
|| tok
== '{')) {
5554 /* NOTE: the previous test is a specific case for automatic
5555 struct/union init */
5556 /* XXX: union needs only one init */
5563 if (tcc_state
->old_struct_init_code
) {
5564 /* an old version of struct initialization.
5565 It have a problems. But with a new version
5566 linux 2.4.26 can't load ramdisk.
5568 while (tok
== '(') {
5572 if (!parse_btype(&type1
, &ad1
))
5574 type_decl(&type1
, &ad1
, &n
, TYPE_ABSTRACT
);
5576 if (!is_assignable_types(type
, &type1
))
5577 tcc_error("invalid type for cast");
5584 if (!parse_btype(&type1
, &ad1
))
5586 type_decl(&type1
, &ad1
, &n
, TYPE_ABSTRACT
);
5588 if (!is_assignable_types(type
, &type1
))
5589 tcc_error("invalid type for cast");
5598 if (first
|| tok
== '{') {
5607 while (tok
!= '}') {
5608 decl_designator(type
, sec
, c
, NULL
, &f
, size_only
);
5610 if (!size_only
&& array_length
< index
) {
5611 init_putz(type
, sec
, c
+ array_length
,
5612 index
- array_length
);
5614 index
= index
+ type_size(&f
->type
, &align1
);
5615 if (index
> array_length
)
5616 array_length
= index
;
5618 /* gr: skip fields from same union - ugly. */
5621 int f_size
= type_size(&f
->type
, &align
);
5622 int f_type
= (f
->type
.t
& VT_BTYPE
);
5624 ///printf("index: %2d %08x -- %2d %08x\n", f->c, f->type.t, f->next->c, f->next->type.t);
5625 /* test for same offset */
5626 if (f
->next
->c
!= f
->c
)
5628 if ((f_type
== VT_STRUCT
) && (f_size
== 0)) {
5630 Lets assume a structure of size 0 can't be a member of the union.
5631 This allow to compile the following code from a linux kernel v2.4.26
5632 typedef struct { } rwlock_t;
5638 struct fs_struct init_fs = { { (1) }, (rwlock_t) {}, 0022, };
5639 tcc-0.9.23 can succesfully compile this version of the kernel.
5640 gcc don't have problems with this code too.
5644 /* if yes, test for bitfield shift */
5645 if ((f
->type
.t
& VT_BITFIELD
) && (f
->next
->type
.t
& VT_BITFIELD
)) {
5646 int bit_pos_1
= (f
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5647 int bit_pos_2
= (f
->next
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5648 //printf("bitfield %d %d\n", bit_pos_1, bit_pos_2);
5649 if (bit_pos_1
!= bit_pos_2
)
5656 if (no_oblock
&& f
== NULL
)
5662 /* put zeros at the end */
5663 if (!size_only
&& array_length
< n
) {
5664 init_putz(type
, sec
, c
+ array_length
,
5673 } else if (tok
== '{') {
5675 decl_initializer(type
, sec
, c
, first
, size_only
);
5677 } else if (size_only
) {
5678 /* just skip expression */
5679 parlevel
= parlevel1
= 0;
5680 while ((parlevel
> 0 || parlevel1
> 0 ||
5681 (tok
!= '}' && tok
!= ',')) && tok
!= -1) {
5684 else if (tok
== ')') {
5685 if (parlevel
== 0 && parlevel1
== 0)
5689 else if (tok
== '{')
5691 else if (tok
== '}') {
5692 if (parlevel
== 0 && parlevel1
== 0)
5699 /* currently, we always use constant expression for globals
5700 (may change for scripting case) */
5701 expr_type
= EXPR_CONST
;
5703 expr_type
= EXPR_ANY
;
5704 init_putv(type
, sec
, c
, 0, expr_type
);
5708 /* parse an initializer for type 't' if 'has_init' is non zero, and
5709 allocate space in local or global data space ('r' is either
5710 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
5711 variable 'v' with an associated name represented by 'asm_label' of
5712 scope 'scope' is declared before initializers are parsed. If 'v' is
5713 zero, then a reference to the new object is put in the value stack.
5714 If 'has_init' is 2, a special parsing is done to handle string
5716 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
,
5717 int has_init
, int v
, char *asm_label
,
5720 int size
, align
, addr
, data_offset
;
5722 ParseState saved_parse_state
= {0};
5723 TokenString init_str
;
5725 Sym
*flexible_array
;
5727 flexible_array
= NULL
;
5728 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
5729 Sym
*field
= type
->ref
->next
;
5732 field
= field
->next
;
5733 if (field
->type
.t
& VT_ARRAY
&& field
->type
.ref
->c
< 0)
5734 flexible_array
= field
;
5738 size
= type_size(type
, &align
);
5739 /* If unknown size, we must evaluate it before
5740 evaluating initializers because
5741 initializers can generate global data too
5742 (e.g. string pointers or ISOC99 compound
5743 literals). It also simplifies local
5744 initializers handling */
5745 tok_str_new(&init_str
);
5746 if (size
< 0 || (flexible_array
&& has_init
)) {
5748 tcc_error("unknown type size");
5749 /* get all init string */
5750 if (has_init
== 2) {
5751 /* only get strings */
5752 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5753 tok_str_add_tok(&init_str
);
5758 while (level
> 0 || (tok
!= ',' && tok
!= ';')) {
5760 tcc_error("unexpected end of file in initializer");
5761 tok_str_add_tok(&init_str
);
5764 else if (tok
== '}') {
5774 tok_str_add(&init_str
, -1);
5775 tok_str_add(&init_str
, 0);
5778 save_parse_state(&saved_parse_state
);
5780 macro_ptr
= init_str
.str
;
5782 decl_initializer(type
, NULL
, 0, 1, 1);
5783 /* prepare second initializer parsing */
5784 macro_ptr
= init_str
.str
;
5787 /* if still unknown size, error */
5788 size
= type_size(type
, &align
);
5790 tcc_error("unknown type size");
5793 size
+= flexible_array
->type
.ref
->c
* pointed_size(&flexible_array
->type
);
5794 /* take into account specified alignment if bigger */
5795 if (ad
->a
.aligned
) {
5796 if (ad
->a
.aligned
> align
)
5797 align
= ad
->a
.aligned
;
5798 } else if (ad
->a
.packed
) {
5801 if ((r
& VT_VALMASK
) == VT_LOCAL
) {
5803 #ifdef CONFIG_TCC_BCHECK
5804 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5808 loc
= (loc
- size
) & -align
;
5810 #ifdef CONFIG_TCC_BCHECK
5811 /* handles bounds */
5812 /* XXX: currently, since we do only one pass, we cannot track
5813 '&' operators, so we add only arrays */
5814 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5816 /* add padding between regions */
5818 /* then add local bound info */
5819 bounds_ptr
= section_ptr_add(lbounds_section
, 2 * sizeof(addr_t
));
5820 bounds_ptr
[0] = addr
;
5821 bounds_ptr
[1] = size
;
5825 /* local variable */
5826 sym_push(v
, type
, r
, addr
);
5828 /* push local reference */
5829 vset(type
, r
, addr
);
5835 if (v
&& scope
== VT_CONST
) {
5836 /* see if the symbol was already defined */
5839 if (!is_compatible_types(&sym
->type
, type
))
5840 tcc_error("incompatible types for redefinition of '%s'",
5841 get_tok_str(v
, NULL
));
5842 if (sym
->type
.t
& VT_EXTERN
) {
5843 /* if the variable is extern, it was not allocated */
5844 sym
->type
.t
&= ~VT_EXTERN
;
5845 /* set array size if it was omitted in extern
5847 if ((sym
->type
.t
& VT_ARRAY
) &&
5848 sym
->type
.ref
->c
< 0 &&
5850 sym
->type
.ref
->c
= type
->ref
->c
;
5852 /* we accept several definitions of the same
5853 global variable. this is tricky, because we
5854 must play with the SHN_COMMON type of the symbol */
5855 /* XXX: should check if the variable was already
5856 initialized. It is incorrect to initialized it
5858 /* no init data, we won't add more to the symbol */
5865 /* allocate symbol in corresponding section */
5870 else if (tcc_state
->nocommon
)
5874 data_offset
= sec
->data_offset
;
5875 data_offset
= (data_offset
+ align
- 1) & -align
;
5877 /* very important to increment global pointer at this time
5878 because initializers themselves can create new initializers */
5879 data_offset
+= size
;
5880 #ifdef CONFIG_TCC_BCHECK
5881 /* add padding if bound check */
5882 if (tcc_state
->do_bounds_check
)
5885 sec
->data_offset
= data_offset
;
5886 /* allocate section space to put the data */
5887 if (sec
->sh_type
!= SHT_NOBITS
&&
5888 data_offset
> sec
->data_allocated
)
5889 section_realloc(sec
, data_offset
);
5890 /* align section if needed */
5891 if (align
> sec
->sh_addralign
)
5892 sec
->sh_addralign
= align
;
5894 addr
= 0; /* avoid warning */
5898 if (scope
!= VT_CONST
|| !sym
) {
5899 sym
= sym_push(v
, type
, r
| VT_SYM
, 0);
5900 sym
->asm_label
= asm_label
;
5902 /* update symbol definition */
5904 put_extern_sym(sym
, sec
, addr
, size
);
5907 /* put a common area */
5908 put_extern_sym(sym
, NULL
, align
, size
);
5909 /* XXX: find a nicer way */
5910 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
5911 esym
->st_shndx
= SHN_COMMON
;
5914 /* push global reference */
5915 sym
= get_sym_ref(type
, sec
, addr
, size
);
5916 vpushsym(type
, sym
);
5918 /* patch symbol weakness */
5919 if (type
->t
& VT_WEAK
)
5921 apply_visibility(sym
, type
);
5922 #ifdef CONFIG_TCC_BCHECK
5923 /* handles bounds now because the symbol must be defined
5924 before for the relocation */
5925 if (tcc_state
->do_bounds_check
) {
5928 greloc(bounds_section
, sym
, bounds_section
->data_offset
, R_DATA_PTR
);
5929 /* then add global bound info */
5930 bounds_ptr
= section_ptr_add(bounds_section
, 2 * sizeof(addr_t
));
5931 bounds_ptr
[0] = 0; /* relocated */
5932 bounds_ptr
[1] = size
;
5936 if (has_init
|| (type
->t
& VT_VLA
)) {
5937 decl_initializer(type
, sec
, addr
, 1, 0);
5938 /* restore parse state if needed */
5940 tok_str_free(init_str
.str
);
5941 restore_parse_state(&saved_parse_state
);
5943 /* patch flexible array member size back to -1, */
5944 /* for possible subsequent similar declarations */
5946 flexible_array
->type
.ref
->c
= -1;
5951 static void put_func_debug(Sym
*sym
)
5956 /* XXX: we put here a dummy type */
5957 snprintf(buf
, sizeof(buf
), "%s:%c1",
5958 funcname
, sym
->type
.t
& VT_STATIC
? 'f' : 'F');
5959 put_stabs_r(buf
, N_FUN
, 0, file
->line_num
, 0,
5960 cur_text_section
, sym
->c
);
5961 /* //gr gdb wants a line at the function */
5962 put_stabn(N_SLINE
, 0, file
->line_num
, 0);
5967 /* parse an old style function declaration list */
5968 /* XXX: check multiple parameter */
5969 static void func_decl_list(Sym
*func_sym
)
5976 /* parse each declaration */
5977 while (tok
!= '{' && tok
!= ';' && tok
!= ',' && tok
!= TOK_EOF
&&
5978 tok
!= TOK_ASM1
&& tok
!= TOK_ASM2
&& tok
!= TOK_ASM3
) {
5979 if (!parse_btype(&btype
, &ad
))
5980 expect("declaration list");
5981 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
5982 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
5984 /* we accept no variable after */
5988 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
5989 /* find parameter in function parameter list */
5992 if ((s
->v
& ~SYM_FIELD
) == v
)
5996 tcc_error("declaration for parameter '%s' but no such parameter",
5997 get_tok_str(v
, NULL
));
5999 /* check that no storage specifier except 'register' was given */
6000 if (type
.t
& VT_STORAGE
)
6001 tcc_error("storage class specified for '%s'", get_tok_str(v
, NULL
));
6002 convert_parameter_type(&type
);
6003 /* we can add the type (NOTE: it could be local to the function) */
6005 /* accept other parameters */
6016 /* parse a function defined by symbol 'sym' and generate its code in
6017 'cur_text_section' */
6018 static void gen_function(Sym
*sym
)
6020 int saved_nocode_wanted
= nocode_wanted
;
6022 ind
= cur_text_section
->data_offset
;
6023 /* NOTE: we patch the symbol size later */
6024 put_extern_sym(sym
, cur_text_section
, ind
, 0);
6025 funcname
= get_tok_str(sym
->v
, NULL
);
6027 /* Initialize VLA state */
6029 vla_sp_root_loc
= -1;
6030 /* put debug symbol */
6031 if (tcc_state
->do_debug
)
6032 put_func_debug(sym
);
6033 /* push a dummy symbol to enable local sym storage */
6034 sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
6035 gfunc_prolog(&sym
->type
);
6036 #ifdef CONFIG_TCC_BCHECK
6037 if (tcc_state
->do_bounds_check
6038 && !strcmp(get_tok_str(sym
->v
, NULL
), "main")) {
6042 for (i
= 0, sym
= local_stack
; i
< 2; i
++, sym
= sym
->prev
) {
6043 if (sym
->v
& SYM_FIELD
|| sym
->prev
->v
& SYM_FIELD
)
6045 vpush_global_sym(&func_old_type
, TOK___bound_main_arg
);
6046 vset(&sym
->type
, sym
->r
, sym
->c
);
6052 block(NULL
, NULL
, NULL
, NULL
, 0, 0);
6055 cur_text_section
->data_offset
= ind
;
6056 label_pop(&global_label_stack
, NULL
);
6057 /* reset local stack */
6058 scope_stack_bottom
= NULL
;
6059 sym_pop(&local_stack
, NULL
);
6060 /* end of function */
6061 /* patch symbol size */
6062 ((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
].st_size
=
6064 /* patch symbol weakness (this definition overrules any prototype) */
6065 if (sym
->type
.t
& VT_WEAK
)
6067 apply_visibility(sym
, &sym
->type
);
6068 if (tcc_state
->do_debug
) {
6069 put_stabn(N_FUN
, 0, 0, ind
- func_ind
);
6071 /* It's better to crash than to generate wrong code */
6072 cur_text_section
= NULL
;
6073 funcname
= ""; /* for safety */
6074 func_vt
.t
= VT_VOID
; /* for safety */
6075 func_var
= 0; /* for safety */
6076 ind
= 0; /* for safety */
6077 nocode_wanted
= saved_nocode_wanted
;
6080 ST_FUNC
void gen_inline_functions(void)
6083 int *str
, inline_generated
, i
;
6084 struct InlineFunc
*fn
;
6086 /* iterate while inline function are referenced */
6088 inline_generated
= 0;
6089 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
6090 fn
= tcc_state
->inline_fns
[i
];
6092 if (sym
&& sym
->c
) {
6093 /* the function was used: generate its code and
6094 convert it to a normal function */
6095 str
= fn
->token_str
;
6098 pstrcpy(file
->filename
, sizeof file
->filename
, fn
->filename
);
6099 sym
->r
= VT_SYM
| VT_CONST
;
6100 sym
->type
.t
&= ~VT_INLINE
;
6104 cur_text_section
= text_section
;
6106 macro_ptr
= NULL
; /* fail safe */
6108 inline_generated
= 1;
6111 if (!inline_generated
)
6114 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
6115 fn
= tcc_state
->inline_fns
[i
];
6116 str
= fn
->token_str
;
6119 dynarray_reset(&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
);
6122 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
6123 static int decl0(int l
, int is_for_loop_init
)
6131 if (!parse_btype(&btype
, &ad
)) {
6132 if (is_for_loop_init
)
6134 /* skip redundant ';' */
6135 /* XXX: find more elegant solution */
6140 if (l
== VT_CONST
&&
6141 (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
6142 /* global asm block */
6146 /* special test for old K&R protos without explicit int
6147 type. Only accepted when defining global data */
6148 if (l
== VT_LOCAL
|| tok
< TOK_DEFINE
)
6152 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
6153 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
6155 if ((btype
.t
& VT_BTYPE
) == VT_STRUCT
) {
6156 int v
= btype
.ref
->v
;
6157 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) >= SYM_FIRST_ANOM
)
6158 tcc_warning("unnamed struct/union that defines no instances");
6163 while (1) { /* iterate thru each declaration */
6164 char *asm_label
; // associated asm label
6166 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
6170 type_to_str(buf
, sizeof(buf
), t
, get_tok_str(v
, NULL
));
6171 printf("type = '%s'\n", buf
);
6174 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
6175 if ((type
.t
& VT_STATIC
) && (l
== VT_LOCAL
)) {
6176 tcc_error("function without file scope cannot be static");
6178 /* if old style function prototype, we accept a
6181 if (sym
->c
== FUNC_OLD
)
6182 func_decl_list(sym
);
6186 if (gnu_ext
&& (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
6189 asm_label_instr(&astr
);
6190 asm_label
= tcc_strdup(astr
.data
);
6193 /* parse one last attribute list, after asm label */
6194 parse_attribute(&ad
);
6199 #ifdef TCC_TARGET_PE
6200 if (ad
.a
.func_import
)
6201 type
.t
|= VT_IMPORT
;
6202 if (ad
.a
.func_export
)
6203 type
.t
|= VT_EXPORT
;
6205 type
.t
|= ad
.a
.visibility
<< VT_VIS_SHIFT
;
6209 tcc_error("cannot use local functions");
6210 if ((type
.t
& VT_BTYPE
) != VT_FUNC
)
6211 expect("function definition");
6213 /* reject abstract declarators in function definition */
6215 while ((sym
= sym
->next
) != NULL
)
6216 if (!(sym
->v
& ~SYM_FIELD
))
6217 expect("identifier");
6219 /* XXX: cannot do better now: convert extern line to static inline */
6220 if ((type
.t
& (VT_EXTERN
| VT_INLINE
)) == (VT_EXTERN
| VT_INLINE
))
6221 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
6226 if ((sym
->type
.t
& VT_BTYPE
) != VT_FUNC
)
6229 ref
= sym
->type
.ref
;
6230 if (0 == ref
->a
.func_proto
)
6231 tcc_error("redefinition of '%s'", get_tok_str(v
, NULL
));
6233 /* use func_call from prototype if not defined */
6234 if (ref
->a
.func_call
!= FUNC_CDECL
6235 && type
.ref
->a
.func_call
== FUNC_CDECL
)
6236 type
.ref
->a
.func_call
= ref
->a
.func_call
;
6238 /* use export from prototype */
6239 if (ref
->a
.func_export
)
6240 type
.ref
->a
.func_export
= 1;
6242 /* use static from prototype */
6243 if (sym
->type
.t
& VT_STATIC
)
6244 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
6246 /* If the definition has no visibility use the
6247 one from prototype. */
6248 if (! (type
.t
& VT_VIS_MASK
))
6249 type
.t
|= sym
->type
.t
& VT_VIS_MASK
;
6251 if (!is_compatible_types(&sym
->type
, &type
)) {
6253 tcc_error("incompatible types for redefinition of '%s'",
6254 get_tok_str(v
, NULL
));
6256 type
.ref
->a
.func_proto
= 0;
6257 /* if symbol is already defined, then put complete type */
6260 /* put function symbol */
6261 sym
= global_identifier_push(v
, type
.t
, 0);
6262 sym
->type
.ref
= type
.ref
;
6265 /* static inline functions are just recorded as a kind
6266 of macro. Their code will be emitted at the end of
6267 the compilation unit only if they are used */
6268 if ((type
.t
& (VT_INLINE
| VT_STATIC
)) ==
6269 (VT_INLINE
| VT_STATIC
)) {
6270 TokenString func_str
;
6272 struct InlineFunc
*fn
;
6273 const char *filename
;
6275 tok_str_new(&func_str
);
6281 tcc_error("unexpected end of file");
6282 tok_str_add_tok(&func_str
);
6287 } else if (t
== '}') {
6289 if (block_level
== 0)
6293 tok_str_add(&func_str
, -1);
6294 tok_str_add(&func_str
, 0);
6295 filename
= file
? file
->filename
: "";
6296 fn
= tcc_malloc(sizeof *fn
+ strlen(filename
));
6297 strcpy(fn
->filename
, filename
);
6299 fn
->token_str
= func_str
.str
;
6300 dynarray_add((void ***)&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
, fn
);
6303 /* compute text section */
6304 cur_text_section
= ad
.section
;
6305 if (!cur_text_section
)
6306 cur_text_section
= text_section
;
6307 sym
->r
= VT_SYM
| VT_CONST
;
6312 if (btype
.t
& VT_TYPEDEF
) {
6313 /* save typedefed type */
6314 /* XXX: test storage specifiers ? */
6315 sym
= sym_push(v
, &type
, 0, 0);
6317 sym
->type
.t
|= VT_TYPEDEF
;
6320 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
6321 /* external function definition */
6322 /* specific case for func_call attribute */
6323 ad
.a
.func_proto
= 1;
6325 } else if (!(type
.t
& VT_ARRAY
)) {
6326 /* not lvalue if array */
6327 r
|= lvalue_type(type
.t
);
6329 has_init
= (tok
== '=');
6330 if (has_init
&& (type
.t
& VT_VLA
))
6331 tcc_error("Variable length array cannot be initialized");
6332 if ((btype
.t
& VT_EXTERN
) || ((type
.t
& VT_BTYPE
) == VT_FUNC
) ||
6333 ((type
.t
& VT_ARRAY
) && (type
.t
& VT_STATIC
) &&
6334 !has_init
&& l
== VT_CONST
&& type
.ref
->c
< 0)) {
6335 /* external variable or function */
6336 /* NOTE: as GCC, uninitialized global static
6337 arrays of null size are considered as
6339 sym
= external_sym(v
, &type
, r
, asm_label
);
6341 if (ad
.alias_target
) {
6346 alias_target
= sym_find(ad
.alias_target
);
6347 if (!alias_target
|| !alias_target
->c
)
6348 tcc_error("unsupported forward __alias__ attribute");
6349 esym
= &((Elf32_Sym
*)symtab_section
->data
)[alias_target
->c
];
6350 tsec
.sh_num
= esym
->st_shndx
;
6351 put_extern_sym2(sym
, &tsec
, esym
->st_value
, esym
->st_size
, 0);
6354 type
.t
|= (btype
.t
& VT_STATIC
); /* Retain "static". */
6355 if (type
.t
& VT_STATIC
)
6361 decl_initializer_alloc(&type
, &ad
, r
, has_init
, v
, asm_label
, l
);
6365 if (is_for_loop_init
)
6378 ST_FUNC
void decl(int l
)