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
*define_stack
;
54 ST_DATA Sym
*global_label_stack
;
55 ST_DATA Sym
*local_label_stack
;
56 static int local_scope
;
58 ST_DATA
int vlas_in_scope
; /* number of VLAs that are currently in scope */
59 ST_DATA
int vla_sp_root_loc
; /* vla_sp_loc for SP before any VLAs were pushed */
60 ST_DATA
int vla_sp_loc
; /* Pointer to variable holding location to store stack pointer on the stack when modifying stack pointer */
62 ST_DATA SValue __vstack
[1+VSTACK_SIZE
], *vtop
, *pvtop
;
64 ST_DATA
int const_wanted
; /* true if constant wanted */
65 ST_DATA
int nocode_wanted
; /* true if no code generation wanted for an expression */
66 ST_DATA
int global_expr
; /* true if compound literals must be allocated globally (used during initializers parsing */
67 ST_DATA CType func_vt
; /* current function return type (used by return instruction) */
68 ST_DATA
int func_var
; /* true if current function is variadic (used by return instruction) */
70 ST_DATA
int last_line_num
, last_ind
, func_ind
; /* debug last line number and pc */
71 ST_DATA
const char *funcname
;
73 ST_DATA CType char_pointer_type
, func_old_type
, int_type
, size_type
;
75 /* ------------------------------------------------------------------------- */
76 static void gen_cast(CType
*type
);
77 static inline CType
*pointed_type(CType
*type
);
78 static int is_compatible_types(CType
*type1
, CType
*type2
);
79 static int parse_btype(CType
*type
, AttributeDef
*ad
);
80 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
);
81 static void parse_expr_type(CType
*type
);
82 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
, int first
, int size_only
);
83 static void block(int *bsym
, int *csym
, int *case_sym
, int *def_sym
, int case_reg
, int is_expr
);
84 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
, int has_init
, int v
, int scope
);
85 static int decl0(int l
, int is_for_loop_init
);
86 static void expr_eq(void);
87 static void expr_lor_const(void);
88 static void unary_type(CType
*type
);
89 static void vla_runtime_type_size(CType
*type
, int *a
);
90 static void vla_sp_restore(void);
91 static void vla_sp_restore_root(void);
92 static int is_compatible_parameter_types(CType
*type1
, CType
*type2
);
93 static void expr_type(CType
*type
);
94 ST_FUNC
void vpush64(int ty
, unsigned long long v
);
95 ST_FUNC
void vpush(CType
*type
);
96 ST_FUNC
int gvtst(int inv
, int t
);
97 ST_FUNC
int is_btype_size(int bt
);
99 ST_INLN
int is_float(int t
)
103 return bt
== VT_LDOUBLE
|| bt
== VT_DOUBLE
|| bt
== VT_FLOAT
|| bt
== VT_QFLOAT
;
106 /* we use our own 'finite' function to avoid potential problems with
107 non standard math libs */
108 /* XXX: endianness dependent */
109 ST_FUNC
int ieee_finite(double d
)
112 memcpy(p
, &d
, sizeof(double));
113 return ((unsigned)((p
[1] | 0x800fffff) + 1)) >> 31;
116 ST_FUNC
void test_lvalue(void)
118 if (!(vtop
->r
& VT_LVAL
))
122 ST_FUNC
void check_vstack(void)
125 tcc_error("internal compiler error: vstack leak (%d)", vtop
- pvtop
);
128 /* ------------------------------------------------------------------------- */
129 /* symbol allocator */
130 static Sym
*__sym_malloc(void)
132 Sym
*sym_pool
, *sym
, *last_sym
;
135 sym_pool
= tcc_malloc(SYM_POOL_NB
* sizeof(Sym
));
136 dynarray_add(&sym_pools
, &nb_sym_pools
, sym_pool
);
138 last_sym
= sym_free_first
;
140 for(i
= 0; i
< SYM_POOL_NB
; i
++) {
141 sym
->next
= last_sym
;
145 sym_free_first
= last_sym
;
149 static inline Sym
*sym_malloc(void)
152 sym
= sym_free_first
;
154 sym
= __sym_malloc();
155 sym_free_first
= sym
->next
;
159 ST_INLN
void sym_free(Sym
*sym
)
161 sym
->next
= sym_free_first
;
162 sym_free_first
= sym
;
165 /* push, without hashing */
166 ST_FUNC Sym
*sym_push2(Sym
**ps
, int v
, int t
, long c
)
186 /* find a symbol and return its associated structure. 's' is the top
187 of the symbol stack */
188 ST_FUNC Sym
*sym_find2(Sym
*s
, int v
)
200 /* structure lookup */
201 ST_INLN Sym
*struct_find(int v
)
204 if ((unsigned)v
>= (unsigned)(tok_ident
- TOK_IDENT
))
206 return table_ident
[v
]->sym_struct
;
209 /* find an identifier */
210 ST_INLN Sym
*sym_find(int v
)
213 if ((unsigned)v
>= (unsigned)(tok_ident
- TOK_IDENT
))
215 return table_ident
[v
]->sym_identifier
;
218 /* push a given symbol on the symbol stack */
219 ST_FUNC Sym
*sym_push(int v
, CType
*type
, int r
, int c
)
228 s
= sym_push2(ps
, v
, type
->t
, c
);
229 s
->type
.ref
= type
->ref
;
231 /* don't record fields or anonymous symbols */
233 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
234 /* record symbol in token array */
235 ts
= table_ident
[(v
& ~SYM_STRUCT
) - TOK_IDENT
];
237 ps
= &ts
->sym_struct
;
239 ps
= &ts
->sym_identifier
;
242 s
->scope
= local_scope
;
243 if (s
->prev_tok
&& s
->prev_tok
->scope
== s
->scope
)
244 tcc_error("redeclaration of '%s'",
245 get_tok_str(v
& ~SYM_STRUCT
, NULL
));
250 /* push a global identifier */
251 ST_FUNC Sym
*global_identifier_push(int v
, int t
, int c
)
254 s
= sym_push2(&global_stack
, v
, t
, c
);
255 /* don't record anonymous symbol */
256 if (v
< SYM_FIRST_ANOM
) {
257 ps
= &table_ident
[v
- TOK_IDENT
]->sym_identifier
;
258 /* modify the top most local identifier, so that
259 sym_identifier will point to 's' when popped */
261 ps
= &(*ps
)->prev_tok
;
268 /* pop symbols until top reaches 'b' */
269 ST_FUNC
void sym_pop(Sym
**ptop
, Sym
*b
)
279 /* remove symbol in token array */
281 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
282 ts
= table_ident
[(v
& ~SYM_STRUCT
) - TOK_IDENT
];
284 ps
= &ts
->sym_struct
;
286 ps
= &ts
->sym_identifier
;
295 static void weaken_symbol(Sym
*sym
)
297 sym
->type
.t
|= VT_WEAK
;
302 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
303 esym_type
= ELFW(ST_TYPE
)(esym
->st_info
);
304 esym
->st_info
= ELFW(ST_INFO
)(STB_WEAK
, esym_type
);
308 static void apply_visibility(Sym
*sym
, CType
*type
)
310 int vis
= sym
->type
.t
& VT_VIS_MASK
;
311 int vis2
= type
->t
& VT_VIS_MASK
;
312 if (vis
== (STV_DEFAULT
<< VT_VIS_SHIFT
))
314 else if (vis2
== (STV_DEFAULT
<< VT_VIS_SHIFT
))
317 vis
= (vis
< vis2
) ? vis
: vis2
;
318 sym
->type
.t
&= ~VT_VIS_MASK
;
324 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
325 vis
>>= VT_VIS_SHIFT
;
326 esym
->st_other
= (esym
->st_other
& ~ELFW(ST_VISIBILITY
)(-1)) | vis
;
330 /* ------------------------------------------------------------------------- */
332 ST_FUNC
void swap(int *p
, int *q
)
340 static void vsetc(CType
*type
, int r
, CValue
*vc
)
344 if (vtop
>= vstack
+ (VSTACK_SIZE
- 1))
345 tcc_error("memory full (vstack)");
346 /* cannot let cpu flags if other instruction are generated. Also
347 avoid leaving VT_JMP anywhere except on the top of the stack
348 because it would complicate the code generator. */
349 if (vtop
>= vstack
) {
350 v
= vtop
->r
& VT_VALMASK
;
351 if (v
== VT_CMP
|| (v
& ~1) == VT_JMP
)
361 /* push constant of type "type" with useless value */
362 ST_FUNC
void vpush(CType
*type
)
365 vsetc(type
, VT_CONST
, &cval
);
368 /* push integer constant */
369 ST_FUNC
void vpushi(int v
)
373 vsetc(&int_type
, VT_CONST
, &cval
);
376 /* push a pointer sized constant */
377 static void vpushs(addr_t v
)
381 vsetc(&size_type
, VT_CONST
, &cval
);
384 /* push arbitrary 64bit constant */
385 ST_FUNC
void vpush64(int ty
, unsigned long long v
)
392 vsetc(&ctype
, VT_CONST
, &cval
);
395 /* push long long constant */
396 static inline void vpushll(long long v
)
398 vpush64(VT_LLONG
, v
);
401 /* push a symbol value of TYPE */
402 static inline void vpushsym(CType
*type
, Sym
*sym
)
406 vsetc(type
, VT_CONST
| VT_SYM
, &cval
);
410 /* Return a static symbol pointing to a section */
411 ST_FUNC Sym
*get_sym_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
417 sym
= global_identifier_push(v
, type
->t
| VT_STATIC
, 0);
418 sym
->type
.ref
= type
->ref
;
419 sym
->r
= VT_CONST
| VT_SYM
;
420 put_extern_sym(sym
, sec
, offset
, size
);
424 /* push a reference to a section offset by adding a dummy symbol */
425 static void vpush_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
427 vpushsym(type
, get_sym_ref(type
, sec
, offset
, size
));
430 /* define a new external reference to a symbol 'v' of type 'u' */
431 ST_FUNC Sym
*external_global_sym(int v
, CType
*type
, int r
)
437 /* push forward reference */
438 s
= global_identifier_push(v
, type
->t
| VT_EXTERN
, 0);
439 s
->type
.ref
= type
->ref
;
440 s
->r
= r
| VT_CONST
| VT_SYM
;
445 /* define a new external reference to a symbol 'v' */
446 static Sym
*external_sym(int v
, CType
*type
, int r
)
452 /* push forward reference */
453 s
= sym_push(v
, type
, r
| VT_CONST
| VT_SYM
, 0);
454 s
->type
.t
|= VT_EXTERN
;
455 } else if (s
->type
.ref
== func_old_type
.ref
) {
456 s
->type
.ref
= type
->ref
;
457 s
->r
= r
| VT_CONST
| VT_SYM
;
458 s
->type
.t
|= VT_EXTERN
;
459 } else if (!is_compatible_types(&s
->type
, type
)) {
460 tcc_error("incompatible types for redefinition of '%s'",
461 get_tok_str(v
, NULL
));
463 /* Merge some storage attributes. */
464 if (type
->t
& VT_WEAK
)
467 if (type
->t
& VT_VIS_MASK
)
468 apply_visibility(s
, type
);
473 /* push a reference to global symbol v */
474 ST_FUNC
void vpush_global_sym(CType
*type
, int v
)
476 vpushsym(type
, external_global_sym(v
, type
, 0));
479 ST_FUNC
void vset(CType
*type
, int r
, int v
)
484 vsetc(type
, r
, &cval
);
487 static void vseti(int r
, int v
)
495 ST_FUNC
void vswap(void)
498 /* cannot let cpu flags if other instruction are generated. Also
499 avoid leaving VT_JMP anywhere except on the top of the stack
500 because it would complicate the code generator. */
501 if (vtop
>= vstack
) {
502 int v
= vtop
->r
& VT_VALMASK
;
503 if (v
== VT_CMP
|| (v
& ~1) == VT_JMP
)
510 /* XXX: +2% overall speed possible with optimized memswap
512 * memswap(&vtop[0], &vtop[1], sizeof *vtop);
516 ST_FUNC
void vpushv(SValue
*v
)
518 if (vtop
>= vstack
+ (VSTACK_SIZE
- 1))
519 tcc_error("memory full (vstack)");
524 static void vdup(void)
529 /* save r to the memory stack, and mark it as being free */
530 ST_FUNC
void save_reg(int r
)
532 int l
, saved
, size
, align
;
536 /* modify all stack values */
539 for(p
=vstack
;p
<=vtop
;p
++) {
540 if ((p
->r
& VT_VALMASK
) == r
||
541 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& (p
->r2
& VT_VALMASK
) == r
)) {
542 /* must save value on stack if not already done */
544 /* NOTE: must reload 'r' because r might be equal to r2 */
545 r
= p
->r
& VT_VALMASK
;
546 /* store register in the stack */
548 if ((p
->r
& VT_LVAL
) ||
549 (!is_float(type
->t
) && (type
->t
& VT_BTYPE
) != VT_LLONG
))
550 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
551 type
= &char_pointer_type
;
555 size
= type_size(type
, &align
);
556 loc
= (loc
- size
) & -align
;
558 sv
.r
= VT_LOCAL
| VT_LVAL
;
561 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
562 /* x86 specific: need to pop fp register ST0 if saved */
564 o(0xd8dd); /* fstp %st(0) */
567 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
568 /* special long long case */
569 if ((type
->t
& VT_BTYPE
) == VT_LLONG
) {
577 /* mark that stack entry as being saved on the stack */
578 if (p
->r
& VT_LVAL
) {
579 /* also clear the bounded flag because the
580 relocation address of the function was stored in
582 p
->r
= (p
->r
& ~(VT_VALMASK
| VT_BOUNDED
)) | VT_LLOCAL
;
584 p
->r
= lvalue_type(p
->type
.t
) | VT_LOCAL
;
592 #ifdef TCC_TARGET_ARM
593 /* find a register of class 'rc2' with at most one reference on stack.
594 * If none, call get_reg(rc) */
595 ST_FUNC
int get_reg_ex(int rc
, int rc2
)
600 for(r
=0;r
<NB_REGS
;r
++) {
601 if (reg_classes
[r
] & rc2
) {
604 for(p
= vstack
; p
<= vtop
; p
++) {
605 if ((p
->r
& VT_VALMASK
) == r
||
606 (p
->r2
& VT_VALMASK
) == r
)
617 /* find a free register of class 'rc'. If none, save one register */
618 ST_FUNC
int get_reg(int rc
)
623 /* find a free register */
624 for(r
=0;r
<NB_REGS
;r
++) {
625 if (reg_classes
[r
] & rc
) {
626 for(p
=vstack
;p
<=vtop
;p
++) {
627 if ((p
->r
& VT_VALMASK
) == r
||
628 (p
->r2
& VT_VALMASK
) == r
)
636 /* no register left : free the first one on the stack (VERY
637 IMPORTANT to start from the bottom to ensure that we don't
638 spill registers used in gen_opi()) */
639 for(p
=vstack
;p
<=vtop
;p
++) {
640 /* look at second register (if long long) */
641 r
= p
->r2
& VT_VALMASK
;
642 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
))
644 r
= p
->r
& VT_VALMASK
;
645 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
)) {
651 /* Should never comes here */
655 /* save registers up to (vtop - n) stack entry */
656 ST_FUNC
void save_regs(int n
)
661 for(p
= vstack
;p
<= p1
; p
++) {
662 r
= p
->r
& VT_VALMASK
;
669 /* move register 's' (of type 't') to 'r', and flush previous value of r to memory
671 static void move_reg(int r
, int s
, int t
)
685 /* get address of vtop (vtop MUST BE an lvalue) */
686 ST_FUNC
void gaddrof(void)
688 if (vtop
->r
& VT_REF
&& !nocode_wanted
)
691 /* tricky: if saved lvalue, then we can go back to lvalue */
692 if ((vtop
->r
& VT_VALMASK
) == VT_LLOCAL
)
693 vtop
->r
= (vtop
->r
& ~(VT_VALMASK
| VT_LVAL_TYPE
)) | VT_LOCAL
| VT_LVAL
;
698 #ifdef CONFIG_TCC_BCHECK
699 /* generate lvalue bound code */
700 static void gbound(void)
705 vtop
->r
&= ~VT_MUSTBOUND
;
706 /* if lvalue, then use checking code before dereferencing */
707 if (vtop
->r
& VT_LVAL
) {
708 /* if not VT_BOUNDED value, then make one */
709 if (!(vtop
->r
& VT_BOUNDED
)) {
710 lval_type
= vtop
->r
& (VT_LVAL_TYPE
| VT_LVAL
);
711 /* must save type because we must set it to int to get pointer */
713 vtop
->type
.t
= VT_PTR
;
716 gen_bounded_ptr_add();
717 vtop
->r
|= lval_type
;
720 /* then check for dereferencing */
721 gen_bounded_ptr_deref();
726 /* store vtop a register belonging to class 'rc'. lvalues are
727 converted to values. Cannot be used if cannot be converted to
728 register value (such as structures). */
729 ST_FUNC
int gv(int rc
)
731 int r
, bit_pos
, bit_size
, size
, align
, i
;
734 /* NOTE: get_reg can modify vstack[] */
735 if (vtop
->type
.t
& VT_BITFIELD
) {
738 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
739 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
740 /* remove bit field info to avoid loops */
741 vtop
->type
.t
&= ~VT_BITFIELD
& ((1 << VT_STRUCT_SHIFT
) - 1);
742 /* cast to int to propagate signedness in following ops */
743 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
748 if((vtop
->type
.t
& VT_UNSIGNED
) ||
749 (vtop
->type
.t
& VT_BTYPE
) == VT_BOOL
)
750 type
.t
|= VT_UNSIGNED
;
752 /* generate shifts */
753 vpushi(bits
- (bit_pos
+ bit_size
));
755 vpushi(bits
- bit_size
);
756 /* NOTE: transformed to SHR if unsigned */
760 if (is_float(vtop
->type
.t
) &&
761 (vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
764 unsigned long offset
;
765 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
769 /* XXX: unify with initializers handling ? */
770 /* CPUs usually cannot use float constants, so we store them
771 generically in data segment */
772 size
= type_size(&vtop
->type
, &align
);
773 offset
= (data_section
->data_offset
+ align
- 1) & -align
;
774 data_section
->data_offset
= offset
;
775 /* XXX: not portable yet */
776 #if defined(__i386__) || defined(__x86_64__)
777 /* Zero pad x87 tenbyte long doubles */
778 if (size
== LDOUBLE_SIZE
) {
779 vtop
->c
.tab
[2] &= 0xffff;
780 #if LDOUBLE_SIZE == 16
785 ptr
= section_ptr_add(data_section
, size
);
787 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
791 ptr
[i
] = vtop
->c
.tab
[size
-1-i
];
795 ptr
[i
] = vtop
->c
.tab
[i
];
796 sym
= get_sym_ref(&vtop
->type
, data_section
, offset
, size
<< 2);
797 vtop
->r
|= VT_LVAL
| VT_SYM
;
801 #ifdef CONFIG_TCC_BCHECK
802 if (vtop
->r
& VT_MUSTBOUND
)
806 r
= vtop
->r
& VT_VALMASK
;
807 rc2
= (rc
& RC_FLOAT
) ? RC_FLOAT
: RC_INT
;
808 #ifndef TCC_TARGET_ARM64
811 #ifdef TCC_TARGET_X86_64
812 else if (rc
== RC_FRET
)
817 /* need to reload if:
819 - lvalue (need to dereference pointer)
820 - already a register, but not in the right class */
822 || (vtop
->r
& VT_LVAL
)
823 || !(reg_classes
[r
] & rc
)
824 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
825 || ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
&& !(reg_classes
[vtop
->r2
] & rc2
))
826 || ((vtop
->type
.t
& VT_BTYPE
) == VT_QFLOAT
&& !(reg_classes
[vtop
->r2
] & rc2
))
828 || ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
&& !(reg_classes
[vtop
->r2
] & rc2
))
833 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
834 if (((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) || ((vtop
->type
.t
& VT_BTYPE
) == VT_QFLOAT
)) {
835 int addr_type
= VT_LLONG
, load_size
= 8, load_type
= ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) ? VT_LLONG
: VT_DOUBLE
;
837 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
838 int addr_type
= VT_INT
, load_size
= 4, load_type
= VT_INT
;
839 unsigned long long ll
;
841 int r2
, original_type
;
842 original_type
= vtop
->type
.t
;
843 /* two register type load : expand to two words
845 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
846 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
849 vtop
->c
.i
= ll
; /* first word */
851 vtop
->r
= r
; /* save register value */
852 vpushi(ll
>> 32); /* second word */
855 if (r
>= VT_CONST
|| /* XXX: test to VT_CONST incorrect ? */
856 (vtop
->r
& VT_LVAL
)) {
857 /* We do not want to modifier the long long
858 pointer here, so the safest (and less
859 efficient) is to save all the other registers
860 in the stack. XXX: totally inefficient. */
862 /* load from memory */
863 vtop
->type
.t
= load_type
;
866 vtop
[-1].r
= r
; /* save register value */
867 /* increment pointer to get second word */
868 vtop
->type
.t
= addr_type
;
873 vtop
->type
.t
= load_type
;
878 vtop
[-1].r
= r
; /* save register value */
879 vtop
->r
= vtop
[-1].r2
;
881 /* Allocate second register. Here we rely on the fact that
882 get_reg() tries first to free r2 of an SValue. */
886 /* write second register */
888 vtop
->type
.t
= original_type
;
889 } else if ((vtop
->r
& VT_LVAL
) && !is_float(vtop
->type
.t
)) {
891 /* lvalue of scalar type : need to use lvalue type
892 because of possible cast */
895 /* compute memory access type */
896 if (vtop
->r
& VT_REF
)
897 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
902 else if (vtop
->r
& VT_LVAL_BYTE
)
904 else if (vtop
->r
& VT_LVAL_SHORT
)
906 if (vtop
->r
& VT_LVAL_UNSIGNED
)
910 /* restore wanted type */
913 /* one register type load */
918 #ifdef TCC_TARGET_C67
919 /* uses register pairs for doubles */
920 if ((vtop
->type
.t
& VT_BTYPE
) == VT_DOUBLE
)
927 /* generate vtop[-1] and vtop[0] in resp. classes rc1 and rc2 */
928 ST_FUNC
void gv2(int rc1
, int rc2
)
932 /* generate more generic register first. But VT_JMP or VT_CMP
933 values must be generated first in all cases to avoid possible
935 v
= vtop
[0].r
& VT_VALMASK
;
936 if (v
!= VT_CMP
&& (v
& ~1) != VT_JMP
&& rc1
<= rc2
) {
941 /* test if reload is needed for first register */
942 if ((vtop
[-1].r
& VT_VALMASK
) >= VT_CONST
) {
952 /* test if reload is needed for first register */
953 if ((vtop
[0].r
& VT_VALMASK
) >= VT_CONST
) {
959 #ifndef TCC_TARGET_ARM64
960 /* wrapper around RC_FRET to return a register by type */
961 static int rc_fret(int t
)
963 #ifdef TCC_TARGET_X86_64
964 if (t
== VT_LDOUBLE
) {
972 /* wrapper around REG_FRET to return a register by type */
973 static int reg_fret(int t
)
975 #ifdef TCC_TARGET_X86_64
976 if (t
== VT_LDOUBLE
) {
983 /* expand long long on stack in two int registers */
984 static void lexpand(void)
988 u
= vtop
->type
.t
& (VT_DEFSIGN
| VT_UNSIGNED
);
991 vtop
[0].r
= vtop
[-1].r2
;
992 vtop
[0].r2
= VT_CONST
;
993 vtop
[-1].r2
= VT_CONST
;
994 vtop
[0].type
.t
= VT_INT
| u
;
995 vtop
[-1].type
.t
= VT_INT
| u
;
998 #ifdef TCC_TARGET_ARM
999 /* expand long long on stack */
1000 ST_FUNC
void lexpand_nr(void)
1004 u
= vtop
->type
.t
& (VT_DEFSIGN
| VT_UNSIGNED
);
1006 vtop
->r2
= VT_CONST
;
1007 vtop
->type
.t
= VT_INT
| u
;
1008 v
=vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
);
1009 if (v
== VT_CONST
) {
1010 vtop
[-1].c
.i
= vtop
->c
.i
;
1011 vtop
->c
.i
= vtop
->c
.i
>> 32;
1013 } else if (v
== (VT_LVAL
|VT_CONST
) || v
== (VT_LVAL
|VT_LOCAL
)) {
1015 vtop
->r
= vtop
[-1].r
;
1016 } else if (v
> VT_CONST
) {
1020 vtop
->r
= vtop
[-1].r2
;
1021 vtop
[-1].r2
= VT_CONST
;
1022 vtop
[-1].type
.t
= VT_INT
| u
;
1026 /* build a long long from two ints */
1027 static void lbuild(int t
)
1029 gv2(RC_INT
, RC_INT
);
1030 vtop
[-1].r2
= vtop
[0].r
;
1031 vtop
[-1].type
.t
= t
;
1035 /* rotate n first stack elements to the bottom
1036 I1 ... In -> I2 ... In I1 [top is right]
1038 ST_FUNC
void vrotb(int n
)
1044 for(i
=-n
+1;i
!=0;i
++)
1045 vtop
[i
] = vtop
[i
+1];
1049 /* rotate the n elements before entry e towards the top
1050 I1 ... In ... -> In I1 ... I(n-1) ... [top is right]
1052 ST_FUNC
void vrote(SValue
*e
, int n
)
1058 for(i
= 0;i
< n
- 1; i
++)
1063 /* rotate n first stack elements to the top
1064 I1 ... In -> In I1 ... I(n-1) [top is right]
1066 ST_FUNC
void vrott(int n
)
1071 /* pop stack value */
1072 ST_FUNC
void vpop(void)
1075 v
= vtop
->r
& VT_VALMASK
;
1076 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
1077 /* for x86, we need to pop the FP stack */
1078 if (v
== TREG_ST0
&& !nocode_wanted
) {
1079 o(0xd8dd); /* fstp %st(0) */
1082 if (v
== VT_JMP
|| v
== VT_JMPI
) {
1083 /* need to put correct jump if && or || without test */
1089 /* convert stack entry to register and duplicate its value in another
1091 static void gv_dup(void)
1097 if ((t
& VT_BTYPE
) == VT_LLONG
) {
1104 /* stack: H L L1 H1 */
1112 /* duplicate value */
1117 #ifdef TCC_TARGET_X86_64
1118 if ((t
& VT_BTYPE
) == VT_LDOUBLE
) {
1128 load(r1
, &sv
); /* move r to r1 */
1130 /* duplicates value */
1136 /* Generate value test
1138 * Generate a test for any value (jump, comparison and integers) */
1139 ST_FUNC
int gvtst(int inv
, int t
)
1141 int v
= vtop
->r
& VT_VALMASK
;
1142 if (v
!= VT_CMP
&& v
!= VT_JMP
&& v
!= VT_JMPI
) {
1146 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
1147 /* constant jmp optimization */
1148 if ((vtop
->c
.i
!= 0) != inv
)
1153 return gtst(inv
, t
);
1156 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
1157 /* generate CPU independent (unsigned) long long operations */
1158 static void gen_opl(int op
)
1160 int t
, a
, b
, op1
, c
, i
;
1162 unsigned short reg_iret
= REG_IRET
;
1163 unsigned short reg_lret
= REG_LRET
;
1169 func
= TOK___divdi3
;
1172 func
= TOK___udivdi3
;
1175 func
= TOK___moddi3
;
1178 func
= TOK___umoddi3
;
1185 /* call generic long long function */
1186 vpush_global_sym(&func_old_type
, func
);
1191 vtop
->r2
= reg_lret
;
1204 /* stack: L1 H1 L2 H2 */
1209 vtop
[-2] = vtop
[-3];
1212 /* stack: H1 H2 L1 L2 */
1218 /* stack: H1 H2 L1 L2 ML MH */
1221 /* stack: ML MH H1 H2 L1 L2 */
1225 /* stack: ML MH H1 L2 H2 L1 */
1230 /* stack: ML MH M1 M2 */
1233 } else if (op
== '+' || op
== '-') {
1234 /* XXX: add non carry method too (for MIPS or alpha) */
1240 /* stack: H1 H2 (L1 op L2) */
1243 gen_op(op1
+ 1); /* TOK_xxxC2 */
1246 /* stack: H1 H2 (L1 op L2) */
1249 /* stack: (L1 op L2) H1 H2 */
1251 /* stack: (L1 op L2) (H1 op H2) */
1259 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
1260 t
= vtop
[-1].type
.t
;
1264 /* stack: L H shift */
1266 /* constant: simpler */
1267 /* NOTE: all comments are for SHL. the other cases are
1268 done by swaping words */
1279 if (op
!= TOK_SAR
) {
1312 /* XXX: should provide a faster fallback on x86 ? */
1315 func
= TOK___ashrdi3
;
1318 func
= TOK___lshrdi3
;
1321 func
= TOK___ashldi3
;
1327 /* compare operations */
1333 /* stack: L1 H1 L2 H2 */
1335 vtop
[-1] = vtop
[-2];
1337 /* stack: L1 L2 H1 H2 */
1340 /* when values are equal, we need to compare low words. since
1341 the jump is inverted, we invert the test too. */
1344 else if (op1
== TOK_GT
)
1346 else if (op1
== TOK_ULT
)
1348 else if (op1
== TOK_UGT
)
1353 if (op1
!= TOK_NE
) {
1357 /* generate non equal test */
1358 /* XXX: NOT PORTABLE yet */
1362 #if defined(TCC_TARGET_I386)
1363 b
= psym(0x850f, 0);
1364 #elif defined(TCC_TARGET_ARM)
1366 o(0x1A000000 | encbranch(ind
, 0, 1));
1367 #elif defined(TCC_TARGET_C67) || defined(TCC_TARGET_ARM64)
1368 tcc_error("not implemented");
1370 #error not supported
1374 /* compare low. Always unsigned */
1378 else if (op1
== TOK_LE
)
1380 else if (op1
== TOK_GT
)
1382 else if (op1
== TOK_GE
)
1393 static uint64_t gen_opic_sdiv(uint64_t a
, uint64_t b
)
1395 uint64_t x
= (a
>> 63 ? -a
: a
) / (b
>> 63 ? -b
: b
);
1396 return (a
^ b
) >> 63 ? -x
: x
;
1399 static int gen_opic_lt(uint64_t a
, uint64_t b
)
1401 return (a
^ (uint64_t)1 << 63) < (b
^ (uint64_t)1 << 63);
1404 /* handle integer constant optimizations and various machine
1406 static void gen_opic(int op
)
1408 SValue
*v1
= vtop
- 1;
1410 int t1
= v1
->type
.t
& VT_BTYPE
;
1411 int t2
= v2
->type
.t
& VT_BTYPE
;
1412 int c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1413 int c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1414 uint64_t l1
= c1
? v1
->c
.i
: 0;
1415 uint64_t l2
= c2
? v2
->c
.i
: 0;
1416 int shm
= (t1
== VT_LLONG
) ? 63 : 31;
1419 l1
= ((uint32_t)l1
|
1420 (v1
->type
.t
& VT_UNSIGNED
? 0 : -(l1
& 0x80000000)));
1422 l2
= ((uint32_t)l2
|
1423 (v2
->type
.t
& VT_UNSIGNED
? 0 : -(l2
& 0x80000000)));
1427 case '+': l1
+= l2
; break;
1428 case '-': l1
-= l2
; break;
1429 case '&': l1
&= l2
; break;
1430 case '^': l1
^= l2
; break;
1431 case '|': l1
|= l2
; break;
1432 case '*': l1
*= l2
; break;
1439 /* if division by zero, generate explicit division */
1442 tcc_error("division by zero in constant");
1446 default: l1
= gen_opic_sdiv(l1
, l2
); break;
1447 case '%': l1
= l1
- l2
* gen_opic_sdiv(l1
, l2
); break;
1448 case TOK_UDIV
: l1
= l1
/ l2
; break;
1449 case TOK_UMOD
: l1
= l1
% l2
; break;
1452 case TOK_SHL
: l1
<<= (l2
& shm
); break;
1453 case TOK_SHR
: l1
>>= (l2
& shm
); break;
1455 l1
= (l1
>> 63) ? ~(~l1
>> (l2
& shm
)) : l1
>> (l2
& shm
);
1458 case TOK_ULT
: l1
= l1
< l2
; break;
1459 case TOK_UGE
: l1
= l1
>= l2
; break;
1460 case TOK_EQ
: l1
= l1
== l2
; break;
1461 case TOK_NE
: l1
= l1
!= l2
; break;
1462 case TOK_ULE
: l1
= l1
<= l2
; break;
1463 case TOK_UGT
: l1
= l1
> l2
; break;
1464 case TOK_LT
: l1
= gen_opic_lt(l1
, l2
); break;
1465 case TOK_GE
: l1
= !gen_opic_lt(l1
, l2
); break;
1466 case TOK_LE
: l1
= !gen_opic_lt(l2
, l1
); break;
1467 case TOK_GT
: l1
= gen_opic_lt(l2
, l1
); break;
1469 case TOK_LAND
: l1
= l1
&& l2
; break;
1470 case TOK_LOR
: l1
= l1
|| l2
; break;
1477 /* if commutative ops, put c2 as constant */
1478 if (c1
&& (op
== '+' || op
== '&' || op
== '^' ||
1479 op
== '|' || op
== '*')) {
1481 c2
= c1
; //c = c1, c1 = c2, c2 = c;
1482 l2
= l1
; //l = l1, l1 = l2, l2 = l;
1484 if (!const_wanted
&&
1486 (op
== TOK_SHL
|| op
== TOK_SHR
|| op
== TOK_SAR
)) ||
1487 (l1
== -1 && op
== TOK_SAR
))) {
1488 /* treat (0 << x), (0 >> x) and (-1 >> x) as constant */
1490 } else if (!const_wanted
&&
1491 c2
&& ((l2
== 0 && (op
== '&' || op
== '*')) ||
1492 (l2
== -1 && op
== '|') ||
1493 (l2
== 0xffffffff && t2
!= VT_LLONG
&& op
== '|') ||
1494 (l2
== 1 && (op
== '%' || op
== TOK_UMOD
)))) {
1495 /* treat (x & 0), (x * 0), (x | -1) and (x % 1) as constant */
1500 } else if (c2
&& (((op
== '*' || op
== '/' || op
== TOK_UDIV
||
1503 ((op
== '+' || op
== '-' || op
== '|' || op
== '^' ||
1504 op
== TOK_SHL
|| op
== TOK_SHR
|| op
== TOK_SAR
) &&
1508 /* filter out NOP operations like x*1, x-0, x&-1... */
1510 } else if (c2
&& (op
== '*' || op
== TOK_PDIV
|| op
== TOK_UDIV
)) {
1511 /* try to use shifts instead of muls or divs */
1512 if (l2
> 0 && (l2
& (l2
- 1)) == 0) {
1521 else if (op
== TOK_PDIV
)
1527 } else if (c2
&& (op
== '+' || op
== '-') &&
1528 (((vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
))
1529 || (vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
)) == VT_LOCAL
)) {
1530 /* symbol + constant case */
1537 if (!nocode_wanted
) {
1538 /* call low level op generator */
1539 if (t1
== VT_LLONG
|| t2
== VT_LLONG
||
1540 (PTR_SIZE
== 8 && (t1
== VT_PTR
|| t2
== VT_PTR
)))
1551 /* generate a floating point operation with constant propagation */
1552 static void gen_opif(int op
)
1560 /* currently, we cannot do computations with forward symbols */
1561 c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1562 c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1564 if (v1
->type
.t
== VT_FLOAT
) {
1567 } else if (v1
->type
.t
== VT_DOUBLE
) {
1575 /* NOTE: we only do constant propagation if finite number (not
1576 NaN or infinity) (ANSI spec) */
1577 if (!ieee_finite(f1
) || !ieee_finite(f2
))
1581 case '+': f1
+= f2
; break;
1582 case '-': f1
-= f2
; break;
1583 case '*': f1
*= f2
; break;
1587 tcc_error("division by zero in constant");
1592 /* XXX: also handles tests ? */
1596 /* XXX: overflow test ? */
1597 if (v1
->type
.t
== VT_FLOAT
) {
1599 } else if (v1
->type
.t
== VT_DOUBLE
) {
1607 if (!nocode_wanted
) {
1615 static int pointed_size(CType
*type
)
1618 return type_size(pointed_type(type
), &align
);
1621 static void vla_runtime_pointed_size(CType
*type
)
1624 vla_runtime_type_size(pointed_type(type
), &align
);
1627 static inline int is_null_pointer(SValue
*p
)
1629 if ((p
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
1631 return ((p
->type
.t
& VT_BTYPE
) == VT_INT
&& (uint32_t)p
->c
.i
== 0) ||
1632 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& p
->c
.i
== 0) ||
1633 ((p
->type
.t
& VT_BTYPE
) == VT_PTR
&&
1634 (PTR_SIZE
== 4 ? (uint32_t)p
->c
.i
== 0 : p
->c
.i
== 0));
1637 static inline int is_integer_btype(int bt
)
1639 return (bt
== VT_BYTE
|| bt
== VT_SHORT
||
1640 bt
== VT_INT
|| bt
== VT_LLONG
);
1643 /* check types for comparison or subtraction of pointers */
1644 static void check_comparison_pointer_types(SValue
*p1
, SValue
*p2
, int op
)
1646 CType
*type1
, *type2
, tmp_type1
, tmp_type2
;
1649 /* null pointers are accepted for all comparisons as gcc */
1650 if (is_null_pointer(p1
) || is_null_pointer(p2
))
1654 bt1
= type1
->t
& VT_BTYPE
;
1655 bt2
= type2
->t
& VT_BTYPE
;
1656 /* accept comparison between pointer and integer with a warning */
1657 if ((is_integer_btype(bt1
) || is_integer_btype(bt2
)) && op
!= '-') {
1658 if (op
!= TOK_LOR
&& op
!= TOK_LAND
)
1659 tcc_warning("comparison between pointer and integer");
1663 /* both must be pointers or implicit function pointers */
1664 if (bt1
== VT_PTR
) {
1665 type1
= pointed_type(type1
);
1666 } else if (bt1
!= VT_FUNC
)
1667 goto invalid_operands
;
1669 if (bt2
== VT_PTR
) {
1670 type2
= pointed_type(type2
);
1671 } else if (bt2
!= VT_FUNC
) {
1673 tcc_error("invalid operands to binary %s", get_tok_str(op
, NULL
));
1675 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
1676 (type2
->t
& VT_BTYPE
) == VT_VOID
)
1680 tmp_type1
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1681 tmp_type2
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1682 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
1683 /* gcc-like error if '-' is used */
1685 goto invalid_operands
;
1687 tcc_warning("comparison of distinct pointer types lacks a cast");
1691 /* generic gen_op: handles types problems */
1692 ST_FUNC
void gen_op(int op
)
1694 int u
, t1
, t2
, bt1
, bt2
, t
;
1697 t1
= vtop
[-1].type
.t
;
1698 t2
= vtop
[0].type
.t
;
1699 bt1
= t1
& VT_BTYPE
;
1700 bt2
= t2
& VT_BTYPE
;
1702 if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
1703 /* at least one operand is a pointer */
1704 /* relationnal op: must be both pointers */
1705 if (op
>= TOK_ULT
&& op
<= TOK_LOR
) {
1706 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1707 /* pointers are handled are unsigned */
1708 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1709 t
= VT_LLONG
| VT_UNSIGNED
;
1711 t
= VT_INT
| VT_UNSIGNED
;
1715 /* if both pointers, then it must be the '-' op */
1716 if (bt1
== VT_PTR
&& bt2
== VT_PTR
) {
1718 tcc_error("cannot use pointers here");
1719 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1720 /* XXX: check that types are compatible */
1721 if (vtop
[-1].type
.t
& VT_VLA
) {
1722 vla_runtime_pointed_size(&vtop
[-1].type
);
1724 vpushi(pointed_size(&vtop
[-1].type
));
1728 /* set to integer type */
1729 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1730 vtop
->type
.t
= VT_LLONG
;
1732 vtop
->type
.t
= VT_INT
;
1737 /* exactly one pointer : must be '+' or '-'. */
1738 if (op
!= '-' && op
!= '+')
1739 tcc_error("cannot use pointers here");
1740 /* Put pointer as first operand */
1741 if (bt2
== VT_PTR
) {
1745 type1
= vtop
[-1].type
;
1746 type1
.t
&= ~VT_ARRAY
;
1747 if (vtop
[-1].type
.t
& VT_VLA
)
1748 vla_runtime_pointed_size(&vtop
[-1].type
);
1750 u
= pointed_size(&vtop
[-1].type
);
1752 tcc_error("unknown array element size");
1753 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1756 /* XXX: cast to int ? (long long case) */
1762 /* #ifdef CONFIG_TCC_BCHECK
1763 The main reason to removing this code:
1770 fprintf(stderr, "v+i-j = %p\n", v+i-j);
1771 fprintf(stderr, "v+(i-j) = %p\n", v+(i-j));
1773 When this code is on. then the output looks like
1775 v+(i-j) = 0xbff84000
1777 /* if evaluating constant expression, no code should be
1778 generated, so no bound check */
1779 if (tcc_state
->do_bounds_check
&& !const_wanted
) {
1780 /* if bounded pointers, we generate a special code to
1787 gen_bounded_ptr_add();
1793 /* put again type if gen_opic() swaped operands */
1796 } else if (is_float(bt1
) || is_float(bt2
)) {
1797 /* compute bigger type and do implicit casts */
1798 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
1800 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
1805 /* floats can only be used for a few operations */
1806 if (op
!= '+' && op
!= '-' && op
!= '*' && op
!= '/' &&
1807 (op
< TOK_ULT
|| op
> TOK_GT
))
1808 tcc_error("invalid operands for binary operation");
1810 } else if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
) {
1811 t
= bt1
== VT_LLONG
? VT_LLONG
: VT_INT
;
1812 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (t
| VT_UNSIGNED
))
1815 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
1816 /* cast to biggest op */
1818 /* convert to unsigned if it does not fit in a long long */
1819 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
1820 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
1823 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
1824 tcc_error("comparison of struct");
1826 /* integer operations */
1828 /* convert to unsigned if it does not fit in an integer */
1829 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
1830 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
1833 /* XXX: currently, some unsigned operations are explicit, so
1834 we modify them here */
1835 if (t
& VT_UNSIGNED
) {
1842 else if (op
== TOK_LT
)
1844 else if (op
== TOK_GT
)
1846 else if (op
== TOK_LE
)
1848 else if (op
== TOK_GE
)
1855 /* special case for shifts and long long: we keep the shift as
1857 if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
)
1864 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
1865 /* relationnal op: the result is an int */
1866 vtop
->type
.t
= VT_INT
;
1871 // Make sure that we have converted to an rvalue:
1872 if (vtop
->r
& VT_LVAL
&& !nocode_wanted
)
1873 gv(is_float(vtop
->type
.t
& VT_BTYPE
) ? RC_FLOAT
: RC_INT
);
1876 #ifndef TCC_TARGET_ARM
1877 /* generic itof for unsigned long long case */
1878 static void gen_cvt_itof1(int t
)
1880 #ifdef TCC_TARGET_ARM64
1883 if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
1884 (VT_LLONG
| VT_UNSIGNED
)) {
1887 vpush_global_sym(&func_old_type
, TOK___floatundisf
);
1888 #if LDOUBLE_SIZE != 8
1889 else if (t
== VT_LDOUBLE
)
1890 vpush_global_sym(&func_old_type
, TOK___floatundixf
);
1893 vpush_global_sym(&func_old_type
, TOK___floatundidf
);
1897 vtop
->r
= reg_fret(t
);
1905 /* generic ftoi for unsigned long long case */
1906 static void gen_cvt_ftoi1(int t
)
1908 #ifdef TCC_TARGET_ARM64
1913 if (t
== (VT_LLONG
| VT_UNSIGNED
)) {
1914 /* not handled natively */
1915 st
= vtop
->type
.t
& VT_BTYPE
;
1917 vpush_global_sym(&func_old_type
, TOK___fixunssfdi
);
1918 #if LDOUBLE_SIZE != 8
1919 else if (st
== VT_LDOUBLE
)
1920 vpush_global_sym(&func_old_type
, TOK___fixunsxfdi
);
1923 vpush_global_sym(&func_old_type
, TOK___fixunsdfdi
);
1928 vtop
->r2
= REG_LRET
;
1935 /* force char or short cast */
1936 static void force_charshort_cast(int t
)
1940 /* XXX: add optimization if lvalue : just change type and offset */
1945 if (t
& VT_UNSIGNED
) {
1946 vpushi((1 << bits
) - 1);
1952 /* result must be signed or the SAR is converted to an SHL
1953 This was not the case when "t" was a signed short
1954 and the last value on the stack was an unsigned int */
1955 vtop
->type
.t
&= ~VT_UNSIGNED
;
1961 /* cast 'vtop' to 'type'. Casting to bitfields is forbidden. */
1962 static void gen_cast(CType
*type
)
1964 int sbt
, dbt
, sf
, df
, c
, p
;
1966 /* special delayed cast for char/short */
1967 /* XXX: in some cases (multiple cascaded casts), it may still
1969 if (vtop
->r
& VT_MUSTCAST
) {
1970 vtop
->r
&= ~VT_MUSTCAST
;
1971 force_charshort_cast(vtop
->type
.t
);
1974 /* bitfields first get cast to ints */
1975 if (vtop
->type
.t
& VT_BITFIELD
&& !nocode_wanted
) {
1979 dbt
= type
->t
& (VT_BTYPE
| VT_UNSIGNED
);
1980 sbt
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
1985 c
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1986 p
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
);
1988 /* constant case: we can do it now */
1989 /* XXX: in ISOC, cannot do it if error in convert */
1990 if (sbt
== VT_FLOAT
)
1991 vtop
->c
.ld
= vtop
->c
.f
;
1992 else if (sbt
== VT_DOUBLE
)
1993 vtop
->c
.ld
= vtop
->c
.d
;
1996 if ((sbt
& VT_BTYPE
) == VT_LLONG
) {
1997 if ((sbt
& VT_UNSIGNED
) || !(vtop
->c
.i
>> 63))
1998 vtop
->c
.ld
= vtop
->c
.i
;
2000 vtop
->c
.ld
= -(long double)-vtop
->c
.i
;
2002 if ((sbt
& VT_UNSIGNED
) || !(vtop
->c
.i
>> 31))
2003 vtop
->c
.ld
= (uint32_t)vtop
->c
.i
;
2005 vtop
->c
.ld
= -(long double)-(uint32_t)vtop
->c
.i
;
2008 if (dbt
== VT_FLOAT
)
2009 vtop
->c
.f
= (float)vtop
->c
.ld
;
2010 else if (dbt
== VT_DOUBLE
)
2011 vtop
->c
.d
= (double)vtop
->c
.ld
;
2012 } else if (sf
&& dbt
== (VT_LLONG
|VT_UNSIGNED
)) {
2013 vtop
->c
.i
= vtop
->c
.ld
;
2014 } else if (sf
&& dbt
== VT_BOOL
) {
2015 vtop
->c
.i
= (vtop
->c
.ld
!= 0);
2018 vtop
->c
.i
= vtop
->c
.ld
;
2019 else if (sbt
== (VT_LLONG
|VT_UNSIGNED
))
2021 else if (sbt
& VT_UNSIGNED
)
2022 vtop
->c
.i
= (uint32_t)vtop
->c
.i
;
2023 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2024 else if (sbt
== VT_PTR
)
2027 else if (sbt
!= VT_LLONG
)
2028 vtop
->c
.i
= ((uint32_t)vtop
->c
.i
|
2029 -(vtop
->c
.i
& 0x80000000));
2031 if (dbt
== (VT_LLONG
|VT_UNSIGNED
))
2033 else if (dbt
== VT_BOOL
)
2034 vtop
->c
.i
= (vtop
->c
.i
!= 0);
2035 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2036 else if (dbt
== VT_PTR
)
2039 else if (dbt
!= VT_LLONG
) {
2040 uint32_t m
= ((dbt
& VT_BTYPE
) == VT_BYTE
? 0xff :
2041 (dbt
& VT_BTYPE
) == VT_SHORT
? 0xffff :
2044 if (!(dbt
& VT_UNSIGNED
))
2045 vtop
->c
.i
|= -(vtop
->c
.i
& ((m
>> 1) + 1));
2048 } else if (p
&& dbt
== VT_BOOL
) {
2051 } else if (!nocode_wanted
) {
2052 /* non constant case: generate code */
2054 /* convert from fp to fp */
2057 /* convert int to fp */
2060 /* convert fp to int */
2061 if (dbt
== VT_BOOL
) {
2065 /* we handle char/short/etc... with generic code */
2066 if (dbt
!= (VT_INT
| VT_UNSIGNED
) &&
2067 dbt
!= (VT_LLONG
| VT_UNSIGNED
) &&
2071 if (dbt
== VT_INT
&& (type
->t
& (VT_BTYPE
| VT_UNSIGNED
)) != dbt
) {
2072 /* additional cast for char/short... */
2077 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
2078 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
) {
2079 if ((sbt
& VT_BTYPE
) != VT_LLONG
&& !nocode_wanted
) {
2080 /* scalar to long long */
2081 /* machine independent conversion */
2083 /* generate high word */
2084 if (sbt
== (VT_INT
| VT_UNSIGNED
)) {
2088 if (sbt
== VT_PTR
) {
2089 /* cast from pointer to int before we apply
2090 shift operation, which pointers don't support*/
2091 gen_cast(&int_type
);
2097 /* patch second register */
2098 vtop
[-1].r2
= vtop
->r
;
2102 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
||
2103 (dbt
& VT_BTYPE
) == VT_PTR
||
2104 (dbt
& VT_BTYPE
) == VT_FUNC
) {
2105 if ((sbt
& VT_BTYPE
) != VT_LLONG
&&
2106 (sbt
& VT_BTYPE
) != VT_PTR
&&
2107 (sbt
& VT_BTYPE
) != VT_FUNC
&& !nocode_wanted
) {
2108 /* need to convert from 32bit to 64bit */
2110 if (sbt
!= (VT_INT
| VT_UNSIGNED
)) {
2111 #if defined(TCC_TARGET_ARM64)
2113 #elif defined(TCC_TARGET_X86_64)
2115 /* x86_64 specific: movslq */
2117 o(0xc0 + (REG_VALUE(r
) << 3) + REG_VALUE(r
));
2124 } else if (dbt
== VT_BOOL
) {
2125 /* scalar to bool */
2128 } else if ((dbt
& VT_BTYPE
) == VT_BYTE
||
2129 (dbt
& VT_BTYPE
) == VT_SHORT
) {
2130 if (sbt
== VT_PTR
) {
2131 vtop
->type
.t
= VT_INT
;
2132 tcc_warning("nonportable conversion from pointer to char/short");
2134 force_charshort_cast(dbt
);
2135 } else if ((dbt
& VT_BTYPE
) == VT_INT
) {
2137 if (sbt
== VT_LLONG
&& !nocode_wanted
) {
2138 /* from long long: just take low order word */
2142 /* if lvalue and single word type, nothing to do because
2143 the lvalue already contains the real type size (see
2144 VT_LVAL_xxx constants) */
2147 } else if ((dbt
& VT_BTYPE
) == VT_PTR
&& !(vtop
->r
& VT_LVAL
)) {
2148 /* if we are casting between pointer types,
2149 we must update the VT_LVAL_xxx size */
2150 vtop
->r
= (vtop
->r
& ~VT_LVAL_TYPE
)
2151 | (lvalue_type(type
->ref
->type
.t
) & VT_LVAL_TYPE
);
2156 /* return type size as known at compile time. Put alignment at 'a' */
2157 ST_FUNC
int type_size(CType
*type
, int *a
)
2162 bt
= type
->t
& VT_BTYPE
;
2163 if (bt
== VT_STRUCT
) {
2168 } else if (bt
== VT_PTR
) {
2169 if (type
->t
& VT_ARRAY
) {
2173 ts
= type_size(&s
->type
, a
);
2175 if (ts
< 0 && s
->c
< 0)
2183 } else if (bt
== VT_LDOUBLE
) {
2185 return LDOUBLE_SIZE
;
2186 } else if (bt
== VT_DOUBLE
|| bt
== VT_LLONG
) {
2187 #ifdef TCC_TARGET_I386
2188 #ifdef TCC_TARGET_PE
2193 #elif defined(TCC_TARGET_ARM)
2203 } else if (bt
== VT_INT
|| bt
== VT_FLOAT
) {
2206 } else if (bt
== VT_SHORT
) {
2209 } else if (bt
== VT_QLONG
|| bt
== VT_QFLOAT
) {
2212 } else if (bt
== VT_ENUM
) {
2214 /* Enums might be incomplete, so don't just return '4' here. */
2215 return type
->ref
->c
;
2217 /* char, void, function, _Bool */
2223 /* push type size as known at runtime time on top of value stack. Put
2225 ST_FUNC
void vla_runtime_type_size(CType
*type
, int *a
)
2227 if (type
->t
& VT_VLA
) {
2228 vset(&int_type
, VT_LOCAL
|VT_LVAL
, type
->ref
->c
);
2230 vpushi(type_size(type
, a
));
2234 static void vla_sp_restore(void) {
2235 if (vlas_in_scope
) {
2236 gen_vla_sp_restore(vla_sp_loc
);
2240 static void vla_sp_restore_root(void) {
2241 if (vlas_in_scope
) {
2242 gen_vla_sp_restore(vla_sp_root_loc
);
2246 /* return the pointed type of t */
2247 static inline CType
*pointed_type(CType
*type
)
2249 return &type
->ref
->type
;
2252 /* modify type so that its it is a pointer to type. */
2253 ST_FUNC
void mk_pointer(CType
*type
)
2256 s
= sym_push(SYM_FIELD
, type
, 0, -1);
2257 type
->t
= VT_PTR
| (type
->t
& ~VT_TYPE
);
2261 /* compare function types. OLD functions match any new functions */
2262 static int is_compatible_func(CType
*type1
, CType
*type2
)
2268 if (!is_compatible_types(&s1
->type
, &s2
->type
))
2270 /* check func_call */
2271 if (s1
->a
.func_call
!= s2
->a
.func_call
)
2273 /* XXX: not complete */
2274 if (s1
->c
== FUNC_OLD
|| s2
->c
== FUNC_OLD
)
2278 while (s1
!= NULL
) {
2281 if (!is_compatible_parameter_types(&s1
->type
, &s2
->type
))
2291 /* return true if type1 and type2 are the same. If unqualified is
2292 true, qualifiers on the types are ignored.
2294 - enums are not checked as gcc __builtin_types_compatible_p ()
2296 static int compare_types(CType
*type1
, CType
*type2
, int unqualified
)
2300 t1
= type1
->t
& VT_TYPE
;
2301 t2
= type2
->t
& VT_TYPE
;
2303 /* strip qualifiers before comparing */
2304 t1
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2305 t2
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2307 /* Default Vs explicit signedness only matters for char */
2308 if ((t1
& VT_BTYPE
) != VT_BYTE
) {
2312 /* XXX: bitfields ? */
2315 /* test more complicated cases */
2316 bt1
= t1
& VT_BTYPE
;
2317 if (bt1
== VT_PTR
) {
2318 type1
= pointed_type(type1
);
2319 type2
= pointed_type(type2
);
2320 return is_compatible_types(type1
, type2
);
2321 } else if (bt1
== VT_STRUCT
) {
2322 return (type1
->ref
== type2
->ref
);
2323 } else if (bt1
== VT_FUNC
) {
2324 return is_compatible_func(type1
, type2
);
2330 /* return true if type1 and type2 are exactly the same (including
2333 static int is_compatible_types(CType
*type1
, CType
*type2
)
2335 return compare_types(type1
,type2
,0);
2338 /* return true if type1 and type2 are the same (ignoring qualifiers).
2340 static int is_compatible_parameter_types(CType
*type1
, CType
*type2
)
2342 return compare_types(type1
,type2
,1);
2345 /* print a type. If 'varstr' is not NULL, then the variable is also
2346 printed in the type */
2348 /* XXX: add array and function pointers */
2349 static void type_to_str(char *buf
, int buf_size
,
2350 CType
*type
, const char *varstr
)
2357 t
= type
->t
& VT_TYPE
;
2360 if (t
& VT_CONSTANT
)
2361 pstrcat(buf
, buf_size
, "const ");
2362 if (t
& VT_VOLATILE
)
2363 pstrcat(buf
, buf_size
, "volatile ");
2364 if ((t
& (VT_DEFSIGN
| VT_UNSIGNED
)) == (VT_DEFSIGN
| VT_UNSIGNED
))
2365 pstrcat(buf
, buf_size
, "unsigned ");
2366 else if (t
& VT_DEFSIGN
)
2367 pstrcat(buf
, buf_size
, "signed ");
2397 tstr
= "long double";
2399 pstrcat(buf
, buf_size
, tstr
);
2403 if (bt
== VT_STRUCT
)
2407 pstrcat(buf
, buf_size
, tstr
);
2408 v
= type
->ref
->v
& ~SYM_STRUCT
;
2409 if (v
>= SYM_FIRST_ANOM
)
2410 pstrcat(buf
, buf_size
, "<anonymous>");
2412 pstrcat(buf
, buf_size
, get_tok_str(v
, NULL
));
2416 type_to_str(buf
, buf_size
, &s
->type
, varstr
);
2417 pstrcat(buf
, buf_size
, "(");
2419 while (sa
!= NULL
) {
2420 type_to_str(buf1
, sizeof(buf1
), &sa
->type
, NULL
);
2421 pstrcat(buf
, buf_size
, buf1
);
2424 pstrcat(buf
, buf_size
, ", ");
2426 pstrcat(buf
, buf_size
, ")");
2431 snprintf(buf1
, sizeof(buf1
), "%s[%ld]", varstr
? varstr
: "", s
->c
);
2432 type_to_str(buf
, buf_size
, &s
->type
, buf1
);
2435 pstrcpy(buf1
, sizeof(buf1
), "*");
2436 if (t
& VT_CONSTANT
)
2437 pstrcat(buf1
, buf_size
, "const ");
2438 if (t
& VT_VOLATILE
)
2439 pstrcat(buf1
, buf_size
, "volatile ");
2441 pstrcat(buf1
, sizeof(buf1
), varstr
);
2442 type_to_str(buf
, buf_size
, &s
->type
, buf1
);
2446 pstrcat(buf
, buf_size
, " ");
2447 pstrcat(buf
, buf_size
, varstr
);
2452 /* verify type compatibility to store vtop in 'dt' type, and generate
2454 static void gen_assign_cast(CType
*dt
)
2456 CType
*st
, *type1
, *type2
, tmp_type1
, tmp_type2
;
2457 char buf1
[256], buf2
[256];
2460 st
= &vtop
->type
; /* source type */
2461 dbt
= dt
->t
& VT_BTYPE
;
2462 sbt
= st
->t
& VT_BTYPE
;
2463 if (sbt
== VT_VOID
|| dbt
== VT_VOID
) {
2464 if (sbt
== VT_VOID
&& dbt
== VT_VOID
)
2466 It is Ok if both are void
2472 gcc accepts this program
2475 tcc_error("cannot cast from/to void");
2477 if (dt
->t
& VT_CONSTANT
)
2478 tcc_warning("assignment of read-only location");
2481 /* special cases for pointers */
2482 /* '0' can also be a pointer */
2483 if (is_null_pointer(vtop
))
2485 /* accept implicit pointer to integer cast with warning */
2486 if (is_integer_btype(sbt
)) {
2487 tcc_warning("assignment makes pointer from integer without a cast");
2490 type1
= pointed_type(dt
);
2491 /* a function is implicitely a function pointer */
2492 if (sbt
== VT_FUNC
) {
2493 if ((type1
->t
& VT_BTYPE
) != VT_VOID
&&
2494 !is_compatible_types(pointed_type(dt
), st
))
2495 tcc_warning("assignment from incompatible pointer type");
2500 type2
= pointed_type(st
);
2501 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
2502 (type2
->t
& VT_BTYPE
) == VT_VOID
) {
2503 /* void * can match anything */
2505 /* exact type match, except for unsigned */
2508 tmp_type1
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
|
2510 tmp_type2
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
|
2512 if (!is_compatible_types(&tmp_type1
, &tmp_type2
))
2513 tcc_warning("assignment from incompatible pointer type");
2515 /* check const and volatile */
2516 if ((!(type1
->t
& VT_CONSTANT
) && (type2
->t
& VT_CONSTANT
)) ||
2517 (!(type1
->t
& VT_VOLATILE
) && (type2
->t
& VT_VOLATILE
)))
2518 tcc_warning("assignment discards qualifiers from pointer target type");
2524 if (sbt
== VT_PTR
|| sbt
== VT_FUNC
) {
2525 tcc_warning("assignment makes integer from pointer without a cast");
2527 /* XXX: more tests */
2532 tmp_type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2533 tmp_type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2534 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
2536 type_to_str(buf1
, sizeof(buf1
), st
, NULL
);
2537 type_to_str(buf2
, sizeof(buf2
), dt
, NULL
);
2538 tcc_error("cannot cast '%s' to '%s'", buf1
, buf2
);
2546 /* store vtop in lvalue pushed on stack */
2547 ST_FUNC
void vstore(void)
2549 int sbt
, dbt
, ft
, r
, t
, size
, align
, bit_size
, bit_pos
, rc
, delayed_cast
;
2551 ft
= vtop
[-1].type
.t
;
2552 sbt
= vtop
->type
.t
& VT_BTYPE
;
2553 dbt
= ft
& VT_BTYPE
;
2554 if ((((sbt
== VT_INT
|| sbt
== VT_SHORT
) && dbt
== VT_BYTE
) ||
2555 (sbt
== VT_INT
&& dbt
== VT_SHORT
))
2556 && !(vtop
->type
.t
& VT_BITFIELD
)) {
2557 /* optimize char/short casts */
2558 delayed_cast
= VT_MUSTCAST
;
2559 vtop
->type
.t
= (ft
& VT_TYPE
& ~VT_BITFIELD
&
2560 ((1 << VT_STRUCT_SHIFT
) - 1));
2561 /* XXX: factorize */
2562 if (ft
& VT_CONSTANT
)
2563 tcc_warning("assignment of read-only location");
2566 if (!(ft
& VT_BITFIELD
))
2567 gen_assign_cast(&vtop
[-1].type
);
2570 if (sbt
== VT_STRUCT
) {
2571 /* if structure, only generate pointer */
2572 /* structure assignment : generate memcpy */
2573 /* XXX: optimize if small size */
2574 if (!nocode_wanted
) {
2575 size
= type_size(&vtop
->type
, &align
);
2579 vtop
->type
.t
= VT_PTR
;
2582 /* address of memcpy() */
2585 vpush_global_sym(&func_old_type
, TOK_memcpy8
);
2586 else if(!(align
& 3))
2587 vpush_global_sym(&func_old_type
, TOK_memcpy4
);
2590 /* Use memmove, rather than memcpy, as dest and src may be same: */
2591 vpush_global_sym(&func_old_type
, TOK_memmove
);
2596 vtop
->type
.t
= VT_PTR
;
2605 /* leave source on stack */
2606 } else if (ft
& VT_BITFIELD
) {
2607 /* bitfield store handling */
2609 /* save lvalue as expression result (example: s.b = s.a = n;) */
2610 vdup(), vtop
[-1] = vtop
[-2];
2612 bit_pos
= (ft
>> VT_STRUCT_SHIFT
) & 0x3f;
2613 bit_size
= (ft
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
2614 /* remove bit field info to avoid loops */
2615 vtop
[-1].type
.t
= ft
& ~VT_BITFIELD
& ((1 << VT_STRUCT_SHIFT
) - 1);
2617 if((ft
& VT_BTYPE
) == VT_BOOL
) {
2618 gen_cast(&vtop
[-1].type
);
2619 vtop
[-1].type
.t
= (vtop
[-1].type
.t
& ~VT_BTYPE
) | (VT_BYTE
| VT_UNSIGNED
);
2622 /* duplicate destination */
2624 vtop
[-1] = vtop
[-2];
2626 /* mask and shift source */
2627 if((ft
& VT_BTYPE
) != VT_BOOL
) {
2628 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2629 vpushll((1ULL << bit_size
) - 1ULL);
2631 vpushi((1 << bit_size
) - 1);
2637 /* load destination, mask and or with source */
2639 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2640 vpushll(~(((1ULL << bit_size
) - 1ULL) << bit_pos
));
2642 vpushi(~(((1 << bit_size
) - 1) << bit_pos
));
2648 /* ... and discard */
2652 if (!nocode_wanted
) {
2653 #ifdef CONFIG_TCC_BCHECK
2654 /* bound check case */
2655 if (vtop
[-1].r
& VT_MUSTBOUND
) {
2664 #ifdef TCC_TARGET_X86_64
2665 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
2667 } else if ((ft
& VT_BTYPE
) == VT_QFLOAT
) {
2672 r
= gv(rc
); /* generate value */
2673 /* if lvalue was saved on stack, must read it */
2674 if ((vtop
[-1].r
& VT_VALMASK
) == VT_LLOCAL
) {
2676 t
= get_reg(RC_INT
);
2677 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2682 sv
.r
= VT_LOCAL
| VT_LVAL
;
2683 sv
.c
.i
= vtop
[-1].c
.i
;
2685 vtop
[-1].r
= t
| VT_LVAL
;
2687 /* two word case handling : store second register at word + 4 (or +8 for x86-64) */
2688 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2689 if (((ft
& VT_BTYPE
) == VT_QLONG
) || ((ft
& VT_BTYPE
) == VT_QFLOAT
)) {
2690 int addr_type
= VT_LLONG
, load_size
= 8, load_type
= ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) ? VT_LLONG
: VT_DOUBLE
;
2692 if ((ft
& VT_BTYPE
) == VT_LLONG
) {
2693 int addr_type
= VT_INT
, load_size
= 4, load_type
= VT_INT
;
2695 vtop
[-1].type
.t
= load_type
;
2698 /* convert to int to increment easily */
2699 vtop
->type
.t
= addr_type
;
2705 vtop
[-1].type
.t
= load_type
;
2706 /* XXX: it works because r2 is spilled last ! */
2707 store(vtop
->r2
, vtop
- 1);
2713 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
2714 vtop
->r
|= delayed_cast
;
2718 /* post defines POST/PRE add. c is the token ++ or -- */
2719 ST_FUNC
void inc(int post
, int c
)
2722 vdup(); /* save lvalue */
2725 gv_dup(); /* duplicate value */
2727 vdup(); /* duplicate value */
2732 vpushi(c
- TOK_MID
);
2734 vstore(); /* store value */
2736 vpop(); /* if post op, return saved value */
2739 /* Parse GNUC __attribute__ extension. Currently, the following
2740 extensions are recognized:
2741 - aligned(n) : set data/function alignment.
2742 - packed : force data alignment to 1
2743 - section(x) : generate data/code in this section.
2744 - unused : currently ignored, but may be used someday.
2745 - regparm(n) : pass function parameters in registers (i386 only)
2747 static void parse_attribute(AttributeDef
*ad
)
2751 while (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
) {
2755 while (tok
!= ')') {
2756 if (tok
< TOK_IDENT
)
2757 expect("attribute name");
2765 expect("section name");
2766 ad
->section
= find_section(tcc_state
, (char *)tokc
.str
.data
);
2774 expect("alias(\"target\")");
2775 ad
->alias_target
= /* save string as token, for later */
2776 tok_alloc((char*)tokc
.str
.data
, tokc
.str
.size
-1)->tok
;
2780 case TOK_VISIBILITY1
:
2781 case TOK_VISIBILITY2
:
2784 expect("visibility(\"default|hidden|internal|protected\")");
2785 if (!strcmp (tokc
.str
.data
, "default"))
2786 ad
->a
.visibility
= STV_DEFAULT
;
2787 else if (!strcmp (tokc
.str
.data
, "hidden"))
2788 ad
->a
.visibility
= STV_HIDDEN
;
2789 else if (!strcmp (tokc
.str
.data
, "internal"))
2790 ad
->a
.visibility
= STV_INTERNAL
;
2791 else if (!strcmp (tokc
.str
.data
, "protected"))
2792 ad
->a
.visibility
= STV_PROTECTED
;
2794 expect("visibility(\"default|hidden|internal|protected\")");
2803 if (n
<= 0 || (n
& (n
- 1)) != 0)
2804 tcc_error("alignment must be a positive power of two");
2821 /* currently, no need to handle it because tcc does not
2822 track unused objects */
2826 /* currently, no need to handle it because tcc does not
2827 track unused objects */
2832 ad
->a
.func_call
= FUNC_CDECL
;
2837 ad
->a
.func_call
= FUNC_STDCALL
;
2839 #ifdef TCC_TARGET_I386
2849 ad
->a
.func_call
= FUNC_FASTCALL1
+ n
- 1;
2855 ad
->a
.func_call
= FUNC_FASTCALLW
;
2862 ad
->a
.mode
= VT_LLONG
+ 1;
2865 ad
->a
.mode
= VT_SHORT
+ 1;
2868 ad
->a
.mode
= VT_INT
+ 1;
2871 tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok
, NULL
));
2878 ad
->a
.func_export
= 1;
2881 ad
->a
.func_import
= 1;
2884 if (tcc_state
->warn_unsupported
)
2885 tcc_warning("'%s' attribute ignored", get_tok_str(t
, NULL
));
2886 /* skip parameters */
2888 int parenthesis
= 0;
2892 else if (tok
== ')')
2895 } while (parenthesis
&& tok
!= -1);
2908 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
2909 static void struct_decl(CType
*type
, AttributeDef
*ad
, int u
)
2911 int a
, v
, size
, align
, maxalign
, c
, offset
, flexible
;
2912 int bit_size
, bit_pos
, bsize
, bt
, lbit_pos
, prevbt
;
2913 Sym
*s
, *ss
, *ass
, **ps
;
2917 a
= tok
; /* save decl type */
2919 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
) {
2920 parse_attribute(ad
);
2926 /* struct already defined ? return it */
2928 expect("struct/union/enum name");
2930 if (s
&& (s
->scope
== local_scope
|| (tok
!= '{' && tok
!= ';'))) {
2932 tcc_error("redefinition of '%s'", get_tok_str(v
, NULL
));
2940 /* we put an undefined size for struct/union */
2941 s
= sym_push(v
| SYM_STRUCT
, &type1
, 0, -1);
2942 s
->r
= 0; /* default alignment is zero as gcc */
2943 /* put struct/union/enum name in type */
2951 tcc_error("struct/union/enum already defined");
2952 /* cannot be empty */
2954 /* non empty enums are not allowed */
2955 if (a
== TOK_ENUM
) {
2959 expect("identifier");
2961 if (ss
&& !local_stack
)
2962 tcc_error("redefinition of enumerator '%s'",
2963 get_tok_str(v
, NULL
));
2969 /* enum symbols have static storage */
2970 ss
= sym_push(v
, &int_type
, VT_CONST
, c
);
2971 ss
->type
.t
|= VT_STATIC
;
2976 /* NOTE: we accept a trailing comma */
2980 s
->c
= type_size(&int_type
, &align
);
2989 while (tok
!= '}') {
2990 parse_btype(&btype
, &ad1
);
2993 tcc_error("flexible array member '%s' not at the end of struct",
2994 get_tok_str(v
, NULL
));
2999 type_decl(&type1
, &ad1
, &v
, TYPE_DIRECT
| TYPE_ABSTRACT
);
3001 if ((type1
.t
& VT_BTYPE
) != VT_STRUCT
)
3002 expect("identifier");
3004 int v
= btype
.ref
->v
;
3005 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
3006 if (tcc_state
->ms_extensions
== 0)
3007 expect("identifier");
3011 if (type_size(&type1
, &align
) < 0) {
3012 if ((a
== TOK_STRUCT
) && (type1
.t
& VT_ARRAY
) && c
)
3015 tcc_error("field '%s' has incomplete type",
3016 get_tok_str(v
, NULL
));
3018 if ((type1
.t
& VT_BTYPE
) == VT_FUNC
||
3019 (type1
.t
& (VT_TYPEDEF
| VT_STATIC
| VT_EXTERN
| VT_INLINE
)))
3020 tcc_error("invalid type for '%s'",
3021 get_tok_str(v
, NULL
));
3025 bit_size
= expr_const();
3026 /* XXX: handle v = 0 case for messages */
3028 tcc_error("negative width in bit-field '%s'",
3029 get_tok_str(v
, NULL
));
3030 if (v
&& bit_size
== 0)
3031 tcc_error("zero width for bit-field '%s'",
3032 get_tok_str(v
, NULL
));
3034 size
= type_size(&type1
, &align
);
3035 if (ad1
.a
.aligned
) {
3036 if (align
< ad1
.a
.aligned
)
3037 align
= ad1
.a
.aligned
;
3038 } else if (ad1
.a
.packed
) {
3040 } else if (*tcc_state
->pack_stack_ptr
) {
3041 if (align
> *tcc_state
->pack_stack_ptr
)
3042 align
= *tcc_state
->pack_stack_ptr
;
3045 if (bit_size
>= 0) {
3046 bt
= type1
.t
& VT_BTYPE
;
3053 tcc_error("bitfields must have scalar type");
3055 if (bit_size
> bsize
) {
3056 tcc_error("width of '%s' exceeds its type",
3057 get_tok_str(v
, NULL
));
3058 } else if (bit_size
== bsize
) {
3059 /* no need for bit fields */
3061 } else if (bit_size
== 0) {
3062 /* XXX: what to do if only padding in a
3064 /* zero size: means to pad */
3067 /* we do not have enough room ?
3068 did the type change?
3070 if ((bit_pos
+ bit_size
) > bsize
||
3071 bt
!= prevbt
|| a
== TOK_UNION
)
3074 /* XXX: handle LSB first */
3075 type1
.t
|= VT_BITFIELD
|
3076 (bit_pos
<< VT_STRUCT_SHIFT
) |
3077 (bit_size
<< (VT_STRUCT_SHIFT
+ 6));
3078 bit_pos
+= bit_size
;
3084 if (v
!= 0 || (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
3085 /* add new memory data only if starting
3087 if (lbit_pos
== 0) {
3088 if (a
== TOK_STRUCT
) {
3089 c
= (c
+ align
- 1) & -align
;
3098 if (align
> maxalign
)
3102 printf("add field %s offset=%d",
3103 get_tok_str(v
, NULL
), offset
);
3104 if (type1
.t
& VT_BITFIELD
) {
3105 printf(" pos=%d size=%d",
3106 (type1
.t
>> VT_STRUCT_SHIFT
) & 0x3f,
3107 (type1
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f);
3112 if (v
== 0 && (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
3114 while ((ass
= ass
->next
) != NULL
) {
3115 ss
= sym_push(ass
->v
, &ass
->type
, 0, offset
+ ass
->c
);
3120 ss
= sym_push(v
| SYM_FIELD
, &type1
, 0, offset
);
3124 if (tok
== ';' || tok
== TOK_EOF
)
3131 /* store size and alignment */
3132 s
->c
= (c
+ maxalign
- 1) & -maxalign
;
3138 /* return 1 if basic type is a type size (short, long, long long) */
3139 ST_FUNC
int is_btype_size(int bt
)
3141 return bt
== VT_SHORT
|| bt
== VT_LONG
|| bt
== VT_LLONG
;
3144 /* Add type qualifiers to a type. If the type is an array then the qualifiers
3145 are added to the element type, copied because it could be a typedef. */
3146 static void parse_btype_qualify(CType
*type
, int qualifiers
)
3148 while (type
->t
& VT_ARRAY
) {
3149 type
->ref
= sym_push(SYM_FIELD
, &type
->ref
->type
, 0, type
->ref
->c
);
3150 type
= &type
->ref
->type
;
3152 type
->t
|= qualifiers
;
3155 /* return 0 if no type declaration. otherwise, return the basic type
3158 static int parse_btype(CType
*type
, AttributeDef
*ad
)
3160 int t
, u
, bt_size
, complete
, type_found
, typespec_found
;
3164 memset(ad
, 0, sizeof(AttributeDef
));
3172 /* currently, we really ignore extension */
3183 tcc_error("too many basic types");
3185 bt_size
= is_btype_size (u
& VT_BTYPE
);
3186 if (u
== VT_INT
|| (!bt_size
&& !(t
& VT_TYPEDEF
)))
3201 if ((t
& VT_BTYPE
) == VT_DOUBLE
) {
3202 #ifndef TCC_TARGET_PE
3203 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3205 } else if ((t
& VT_BTYPE
) == VT_LONG
) {
3206 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3212 #ifdef TCC_TARGET_ARM64
3214 /* GCC's __uint128_t appears in some Linux header files. Make it a
3215 synonym for long double to get the size and alignment right. */
3227 if ((t
& VT_BTYPE
) == VT_LONG
) {
3228 #ifdef TCC_TARGET_PE
3229 t
= (t
& ~VT_BTYPE
) | VT_DOUBLE
;
3231 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3239 struct_decl(&type1
, ad
, VT_ENUM
);
3242 type
->ref
= type1
.ref
;
3246 struct_decl(&type1
, ad
, VT_STRUCT
);
3249 /* type modifiers */
3254 parse_btype_qualify(type
, VT_CONSTANT
);
3262 parse_btype_qualify(type
, VT_VOLATILE
);
3269 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == (VT_DEFSIGN
|VT_UNSIGNED
))
3270 tcc_error("signed and unsigned modifier");
3283 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == VT_DEFSIGN
)
3284 tcc_error("signed and unsigned modifier");
3285 t
|= VT_DEFSIGN
| VT_UNSIGNED
;
3310 /* GNUC attribute */
3311 case TOK_ATTRIBUTE1
:
3312 case TOK_ATTRIBUTE2
:
3313 parse_attribute(ad
);
3316 t
= (t
& ~VT_BTYPE
) | u
;
3324 parse_expr_type(&type1
);
3325 /* remove all storage modifiers except typedef */
3326 type1
.t
&= ~(VT_STORAGE
&~VT_TYPEDEF
);
3332 if (!s
|| !(s
->type
.t
& VT_TYPEDEF
))
3335 type
->t
= ((s
->type
.t
& ~VT_TYPEDEF
) |
3336 (t
& ~(VT_CONSTANT
| VT_VOLATILE
)));
3337 type
->ref
= s
->type
.ref
;
3338 if (t
& (VT_CONSTANT
| VT_VOLATILE
))
3339 parse_btype_qualify(type
, t
& (VT_CONSTANT
| VT_VOLATILE
));
3343 /* get attributes from typedef */
3344 if (0 == ad
->a
.aligned
)
3345 ad
->a
.aligned
= s
->a
.aligned
;
3346 if (0 == ad
->a
.func_call
)
3347 ad
->a
.func_call
= s
->a
.func_call
;
3348 ad
->a
.packed
|= s
->a
.packed
;
3357 if (tcc_state
->char_is_unsigned
) {
3358 if ((t
& (VT_DEFSIGN
|VT_BTYPE
)) == VT_BYTE
)
3362 /* long is never used as type */
3363 if ((t
& VT_BTYPE
) == VT_LONG
)
3364 #if (!defined TCC_TARGET_X86_64 && !defined TCC_TARGET_ARM64) || \
3365 defined TCC_TARGET_PE
3366 t
= (t
& ~VT_BTYPE
) | VT_INT
;
3368 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3374 /* convert a function parameter type (array to pointer and function to
3375 function pointer) */
3376 static inline void convert_parameter_type(CType
*pt
)
3378 /* remove const and volatile qualifiers (XXX: const could be used
3379 to indicate a const function parameter */
3380 pt
->t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3381 /* array must be transformed to pointer according to ANSI C */
3383 if ((pt
->t
& VT_BTYPE
) == VT_FUNC
) {
3388 ST_FUNC
void parse_asm_str(CString
*astr
)
3391 /* read the string */
3393 expect("string constant");
3395 while (tok
== TOK_STR
) {
3396 /* XXX: add \0 handling too ? */
3397 cstr_cat(astr
, tokc
.str
.data
, -1);
3400 cstr_ccat(astr
, '\0');
3403 /* Parse an asm label and return the token */
3404 static int asm_label_instr(void)
3410 parse_asm_str(&astr
);
3413 printf("asm_alias: \"%s\"\n", (char *)astr
.data
);
3415 v
= tok_alloc(astr
.data
, astr
.size
- 1)->tok
;
3420 static void post_type(CType
*type
, AttributeDef
*ad
)
3422 int n
, l
, t1
, arg_size
, align
;
3423 Sym
**plast
, *s
, *first
;
3428 /* function declaration */
3436 /* read param name and compute offset */
3437 if (l
!= FUNC_OLD
) {
3438 if (!parse_btype(&pt
, &ad1
)) {
3440 tcc_error("invalid type");
3447 if ((pt
.t
& VT_BTYPE
) == VT_VOID
&& tok
== ')')
3449 type_decl(&pt
, &ad1
, &n
, TYPE_DIRECT
| TYPE_ABSTRACT
);
3450 if ((pt
.t
& VT_BTYPE
) == VT_VOID
)
3451 tcc_error("parameter declared as void");
3452 arg_size
+= (type_size(&pt
, &align
) + PTR_SIZE
- 1) / PTR_SIZE
;
3457 expect("identifier");
3461 convert_parameter_type(&pt
);
3462 s
= sym_push(n
| SYM_FIELD
, &pt
, 0, 0);
3468 if (l
== FUNC_NEW
&& tok
== TOK_DOTS
) {
3475 /* if no parameters, then old type prototype */
3479 /* NOTE: const is ignored in returned type as it has a special
3480 meaning in gcc / C++ */
3481 type
->t
&= ~VT_CONSTANT
;
3482 /* some ancient pre-K&R C allows a function to return an array
3483 and the array brackets to be put after the arguments, such
3484 that "int c()[]" means something like "int[] c()" */
3487 skip(']'); /* only handle simple "[]" */
3490 /* we push a anonymous symbol which will contain the function prototype */
3491 ad
->a
.func_args
= arg_size
;
3492 s
= sym_push(SYM_FIELD
, type
, 0, l
);
3497 } else if (tok
== '[') {
3498 /* array definition */
3500 if (tok
== TOK_RESTRICT1
)
3505 if (!local_stack
|| nocode_wanted
)
3506 vpushi(expr_const());
3508 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3511 tcc_error("invalid array size");
3513 if (!is_integer_btype(vtop
->type
.t
& VT_BTYPE
))
3514 tcc_error("size of variable length array should be an integer");
3519 /* parse next post type */
3520 post_type(type
, ad
);
3521 if (type
->t
== VT_FUNC
)
3522 tcc_error("declaration of an array of functions");
3523 t1
|= type
->t
& VT_VLA
;
3526 loc
-= type_size(&int_type
, &align
);
3530 vla_runtime_type_size(type
, &align
);
3532 vset(&int_type
, VT_LOCAL
|VT_LVAL
, n
);
3539 /* we push an anonymous symbol which will contain the array
3541 s
= sym_push(SYM_FIELD
, type
, 0, n
);
3542 type
->t
= (t1
? VT_VLA
: VT_ARRAY
) | VT_PTR
;
3547 /* Parse a type declaration (except basic type), and return the type
3548 in 'type'. 'td' is a bitmask indicating which kind of type decl is
3549 expected. 'type' should contain the basic type. 'ad' is the
3550 attribute definition of the basic type. It can be modified by
3553 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
)
3556 CType type1
, *type2
;
3557 int qualifiers
, storage
;
3559 while (tok
== '*') {
3567 qualifiers
|= VT_CONSTANT
;
3572 qualifiers
|= VT_VOLATILE
;
3580 type
->t
|= qualifiers
;
3583 /* XXX: clarify attribute handling */
3584 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3585 parse_attribute(ad
);
3587 /* recursive type */
3588 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
3589 type1
.t
= 0; /* XXX: same as int */
3592 /* XXX: this is not correct to modify 'ad' at this point, but
3593 the syntax is not clear */
3594 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3595 parse_attribute(ad
);
3596 type_decl(&type1
, ad
, v
, td
);
3599 /* type identifier */
3600 if (tok
>= TOK_IDENT
&& (td
& TYPE_DIRECT
)) {
3604 if (!(td
& TYPE_ABSTRACT
))
3605 expect("identifier");
3609 storage
= type
->t
& VT_STORAGE
;
3610 type
->t
&= ~VT_STORAGE
;
3611 if (storage
& VT_STATIC
) {
3612 int saved_nocode_wanted
= nocode_wanted
;
3614 post_type(type
, ad
);
3615 nocode_wanted
= saved_nocode_wanted
;
3617 post_type(type
, ad
);
3619 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3620 parse_attribute(ad
);
3624 /* append type at the end of type1 */
3637 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
3638 ST_FUNC
int lvalue_type(int t
)
3643 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
3645 else if (bt
== VT_SHORT
)
3649 if (t
& VT_UNSIGNED
)
3650 r
|= VT_LVAL_UNSIGNED
;
3654 /* indirection with full error checking and bound check */
3655 ST_FUNC
void indir(void)
3657 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
) {
3658 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FUNC
)
3662 if ((vtop
->r
& VT_LVAL
) && !nocode_wanted
)
3664 vtop
->type
= *pointed_type(&vtop
->type
);
3665 /* Arrays and functions are never lvalues */
3666 if (!(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_VLA
)
3667 && (vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
3668 vtop
->r
|= lvalue_type(vtop
->type
.t
);
3669 /* if bound checking, the referenced pointer must be checked */
3670 #ifdef CONFIG_TCC_BCHECK
3671 if (tcc_state
->do_bounds_check
)
3672 vtop
->r
|= VT_MUSTBOUND
;
3677 /* pass a parameter to a function and do type checking and casting */
3678 static void gfunc_param_typed(Sym
*func
, Sym
*arg
)
3683 func_type
= func
->c
;
3684 if (func_type
== FUNC_OLD
||
3685 (func_type
== FUNC_ELLIPSIS
&& arg
== NULL
)) {
3686 /* default casting : only need to convert float to double */
3687 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
) {
3690 } else if (vtop
->type
.t
& VT_BITFIELD
) {
3691 type
.t
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
3694 } else if (arg
== NULL
) {
3695 tcc_error("too many arguments to function");
3698 type
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
3699 gen_assign_cast(&type
);
3703 /* parse an expression of the form '(type)' or '(expr)' and return its
3705 static void parse_expr_type(CType
*type
)
3711 if (parse_btype(type
, &ad
)) {
3712 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3719 static void parse_type(CType
*type
)
3724 if (!parse_btype(type
, &ad
)) {
3727 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3730 static void vpush_tokc(int t
)
3735 vsetc(&type
, VT_CONST
, &tokc
);
3738 ST_FUNC
void unary(void)
3740 int n
, t
, align
, size
, r
, sizeof_caller
;
3744 static int in_sizeof
= 0;
3746 sizeof_caller
= in_sizeof
;
3748 /* XXX: GCC 2.95.3 does not generate a table although it should be
3762 vpush_tokc(VT_INT
| VT_UNSIGNED
);
3766 vpush_tokc(VT_LLONG
);
3770 vpush_tokc(VT_LLONG
| VT_UNSIGNED
);
3774 vpush_tokc(VT_FLOAT
);
3778 vpush_tokc(VT_DOUBLE
);
3782 vpush_tokc(VT_LDOUBLE
);
3785 case TOK___FUNCTION__
:
3787 goto tok_identifier
;
3793 /* special function name identifier */
3794 len
= strlen(funcname
) + 1;
3795 /* generate char[len] type */
3800 vpush_ref(&type
, data_section
, data_section
->data_offset
, len
);
3801 ptr
= section_ptr_add(data_section
, len
);
3802 memcpy(ptr
, funcname
, len
);
3807 #ifdef TCC_TARGET_PE
3808 t
= VT_SHORT
| VT_UNSIGNED
;
3814 /* string parsing */
3817 if (tcc_state
->warn_write_strings
)
3822 memset(&ad
, 0, sizeof(AttributeDef
));
3823 decl_initializer_alloc(&type
, &ad
, VT_CONST
, 2, 0, 0);
3828 if (parse_btype(&type
, &ad
)) {
3829 type_decl(&type
, &ad
, &n
, TYPE_ABSTRACT
);
3831 /* check ISOC99 compound literal */
3833 /* data is allocated locally by default */
3838 /* all except arrays are lvalues */
3839 if (!(type
.t
& VT_ARRAY
))
3840 r
|= lvalue_type(type
.t
);
3841 memset(&ad
, 0, sizeof(AttributeDef
));
3842 decl_initializer_alloc(&type
, &ad
, r
, 1, 0, 0);
3844 if (sizeof_caller
) {
3851 } else if (tok
== '{') {
3853 tcc_error("expected constant");
3854 /* save all registers */
3857 /* statement expression : we do not accept break/continue
3858 inside as GCC does */
3859 block(NULL
, NULL
, NULL
, NULL
, 0, 1);
3874 /* functions names must be treated as function pointers,
3875 except for unary '&' and sizeof. Since we consider that
3876 functions are not lvalues, we only have to handle it
3877 there and in function calls. */
3878 /* arrays can also be used although they are not lvalues */
3879 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
&&
3880 !(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_LLOCAL
))
3882 mk_pointer(&vtop
->type
);
3888 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3890 boolean
.t
= VT_BOOL
;
3892 vtop
->c
.i
= !vtop
->c
.i
;
3893 } else if ((vtop
->r
& VT_VALMASK
) == VT_CMP
)
3897 vseti(VT_JMP
, gvtst(1, 0));
3909 if ((vtop
->type
.t
& VT_BTYPE
) == VT_PTR
)
3910 tcc_error("pointer not accepted for unary plus");
3911 /* In order to force cast, we add zero, except for floating point
3912 where we really need an noop (otherwise -0.0 will be transformed
3914 if (!is_float(vtop
->type
.t
)) {
3925 unary_type(&type
); // Perform a in_sizeof = 0;
3926 size
= type_size(&type
, &align
);
3927 if (t
== TOK_SIZEOF
) {
3928 if (!(type
.t
& VT_VLA
)) {
3930 tcc_error("sizeof applied to an incomplete type");
3933 vla_runtime_type_size(&type
, &align
);
3938 vtop
->type
.t
|= VT_UNSIGNED
;
3941 case TOK_builtin_expect
:
3943 /* __builtin_expect is a no-op for now */
3944 int saved_nocode_wanted
;
3949 saved_nocode_wanted
= nocode_wanted
;
3953 nocode_wanted
= saved_nocode_wanted
;
3957 case TOK_builtin_types_compatible_p
:
3966 type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3967 type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3968 vpushi(is_compatible_types(&type1
, &type2
));
3971 case TOK_builtin_constant_p
:
3973 int saved_nocode_wanted
, res
;
3976 saved_nocode_wanted
= nocode_wanted
;
3979 res
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
3981 nocode_wanted
= saved_nocode_wanted
;
3986 case TOK_builtin_frame_address
:
3987 case TOK_builtin_return_address
:
3994 if (tok
!= TOK_CINT
) {
3995 tcc_error("%s only takes positive integers",
3996 tok1
== TOK_builtin_return_address
?
3997 "__builtin_return_address" :
3998 "__builtin_frame_address");
4000 level
= (uint32_t)tokc
.i
;
4005 vset(&type
, VT_LOCAL
, 0); /* local frame */
4007 mk_pointer(&vtop
->type
);
4008 indir(); /* -> parent frame */
4010 if (tok1
== TOK_builtin_return_address
) {
4011 // assume return address is just above frame pointer on stack
4014 mk_pointer(&vtop
->type
);
4019 #ifdef TCC_TARGET_X86_64
4020 #ifdef TCC_TARGET_PE
4021 case TOK_builtin_va_start
:
4029 if ((vtop
->r
& VT_VALMASK
) != VT_LOCAL
)
4030 tcc_error("__builtin_va_start expects a local variable");
4031 vtop
->r
&= ~(VT_LVAL
| VT_REF
);
4032 vtop
->type
= char_pointer_type
;
4037 case TOK_builtin_va_arg_types
:
4044 vpushi(classify_x86_64_va_arg(&type
));
4050 #ifdef TCC_TARGET_ARM64
4051 case TOK___va_start
: {
4053 tcc_error("statement in global scope");
4063 vtop
->type
.t
= VT_VOID
;
4066 case TOK___va_arg
: {
4069 tcc_error("statement in global scope");
4081 case TOK___arm64_clear_cache
: {
4090 vtop
->type
.t
= VT_VOID
;
4094 /* pre operations */
4105 t
= vtop
->type
.t
& VT_BTYPE
;
4107 /* In IEEE negate(x) isn't subtract(0,x), but rather
4112 else if (t
== VT_DOUBLE
)
4123 goto tok_identifier
;
4125 /* allow to take the address of a label */
4126 if (tok
< TOK_UIDENT
)
4127 expect("label identifier");
4128 s
= label_find(tok
);
4130 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
4132 if (s
->r
== LABEL_DECLARED
)
4133 s
->r
= LABEL_FORWARD
;
4136 s
->type
.t
= VT_VOID
;
4137 mk_pointer(&s
->type
);
4138 s
->type
.t
|= VT_STATIC
;
4140 vpushsym(&s
->type
, s
);
4144 // special qnan , snan and infinity values
4146 vpush64(VT_DOUBLE
, 0x7ff8000000000000ULL
);
4150 vpush64(VT_DOUBLE
, 0x7ff0000000000001ULL
);
4154 vpush64(VT_DOUBLE
, 0x7ff0000000000000ULL
);
4163 expect("identifier");
4166 const char *name
= get_tok_str(t
, NULL
);
4168 tcc_error("'%s' undeclared", name
);
4169 /* for simple function calls, we tolerate undeclared
4170 external reference to int() function */
4171 if (tcc_state
->warn_implicit_function_declaration
4172 #ifdef TCC_TARGET_PE
4173 /* people must be warned about using undeclared WINAPI functions
4174 (which usually start with uppercase letter) */
4175 || (name
[0] >= 'A' && name
[0] <= 'Z')
4178 tcc_warning("implicit declaration of function '%s'", name
);
4179 s
= external_global_sym(t
, &func_old_type
, 0);
4181 if ((s
->type
.t
& (VT_STATIC
| VT_INLINE
| VT_BTYPE
)) ==
4182 (VT_STATIC
| VT_INLINE
| VT_FUNC
)) {
4183 /* if referencing an inline function, then we generate a
4184 symbol to it if not already done. It will have the
4185 effect to generate code for it at the end of the
4186 compilation unit. Inline function as always
4187 generated in the text section. */
4189 put_extern_sym(s
, text_section
, 0, 0);
4190 r
= VT_SYM
| VT_CONST
;
4194 vset(&s
->type
, r
, s
->c
);
4195 /* if forward reference, we must point to s */
4196 if (vtop
->r
& VT_SYM
) {
4203 /* post operations */
4205 if (tok
== TOK_INC
|| tok
== TOK_DEC
) {
4208 } else if (tok
== '.' || tok
== TOK_ARROW
|| tok
== TOK_CDOUBLE
) {
4211 if (tok
== TOK_ARROW
)
4213 qualifiers
= vtop
->type
.t
& (VT_CONSTANT
| VT_VOLATILE
);
4216 /* expect pointer on structure */
4217 if ((vtop
->type
.t
& VT_BTYPE
) != VT_STRUCT
)
4218 expect("struct or union");
4219 if (tok
== TOK_CDOUBLE
)
4220 expect("field name");
4222 if (tok
== TOK_CINT
|| tok
== TOK_CUINT
)
4223 expect("field name");
4227 while ((s
= s
->next
) != NULL
) {
4232 tcc_error("field not found: %s", get_tok_str(tok
& ~SYM_FIELD
, &tokc
));
4233 /* add field offset to pointer */
4234 vtop
->type
= char_pointer_type
; /* change type to 'char *' */
4237 /* change type to field type, and set to lvalue */
4238 vtop
->type
= s
->type
;
4239 vtop
->type
.t
|= qualifiers
;
4240 /* an array is never an lvalue */
4241 if (!(vtop
->type
.t
& VT_ARRAY
)) {
4242 vtop
->r
|= lvalue_type(vtop
->type
.t
);
4243 #ifdef CONFIG_TCC_BCHECK
4244 /* if bound checking, the referenced pointer must be checked */
4245 if (tcc_state
->do_bounds_check
)
4246 vtop
->r
|= VT_MUSTBOUND
;
4250 } else if (tok
== '[') {
4256 } else if (tok
== '(') {
4259 int nb_args
, ret_nregs
, ret_align
, regsize
, variadic
;
4262 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
4263 /* pointer test (no array accepted) */
4264 if ((vtop
->type
.t
& (VT_BTYPE
| VT_ARRAY
)) == VT_PTR
) {
4265 vtop
->type
= *pointed_type(&vtop
->type
);
4266 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
)
4270 expect("function pointer");
4273 vtop
->r
&= ~VT_LVAL
; /* no lvalue */
4275 /* get return type */
4278 sa
= s
->next
; /* first parameter */
4281 /* compute first implicit argument if a structure is returned */
4282 if ((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
4283 variadic
= (s
->c
== FUNC_ELLIPSIS
);
4284 ret_nregs
= gfunc_sret(&s
->type
, variadic
, &ret
.type
,
4285 &ret_align
, ®size
);
4287 /* get some space for the returned structure */
4288 size
= type_size(&s
->type
, &align
);
4289 #ifdef TCC_TARGET_ARM64
4290 /* On arm64, a small struct is return in registers.
4291 It is much easier to write it to memory if we know
4292 that we are allowed to write some extra bytes, so
4293 round the allocated space up to a power of 2: */
4295 while (size
& (size
- 1))
4296 size
= (size
| (size
- 1)) + 1;
4298 loc
= (loc
- size
) & -align
;
4300 ret
.r
= VT_LOCAL
| VT_LVAL
;
4301 /* pass it as 'int' to avoid structure arg passing
4303 vseti(VT_LOCAL
, loc
);
4313 /* return in register */
4314 if (is_float(ret
.type
.t
)) {
4315 ret
.r
= reg_fret(ret
.type
.t
);
4316 #ifdef TCC_TARGET_X86_64
4317 if ((ret
.type
.t
& VT_BTYPE
) == VT_QFLOAT
)
4321 #ifndef TCC_TARGET_ARM64
4322 #ifdef TCC_TARGET_X86_64
4323 if ((ret
.type
.t
& VT_BTYPE
) == VT_QLONG
)
4325 if ((ret
.type
.t
& VT_BTYPE
) == VT_LLONG
)
4336 gfunc_param_typed(s
, sa
);
4346 tcc_error("too few arguments to function");
4348 if (!nocode_wanted
) {
4349 gfunc_call(nb_args
);
4351 vtop
-= (nb_args
+ 1);
4355 for (r
= ret
.r
+ ret_nregs
+ !ret_nregs
; r
-- > ret
.r
;) {
4356 vsetc(&ret
.type
, r
, &ret
.c
);
4357 vtop
->r2
= ret
.r2
; /* Loop only happens when r2 is VT_CONST */
4360 /* handle packed struct return */
4361 if (((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) && ret_nregs
) {
4364 size
= type_size(&s
->type
, &align
);
4365 /* We're writing whole regs often, make sure there's enough
4366 space. Assume register size is power of 2. */
4367 if (regsize
> align
)
4369 loc
= (loc
- size
) & -align
;
4373 vset(&ret
.type
, VT_LOCAL
| VT_LVAL
, addr
+ offset
);
4377 if (--ret_nregs
== 0)
4381 vset(&s
->type
, VT_LOCAL
| VT_LVAL
, addr
);
4389 ST_FUNC
void expr_prod(void)
4394 while (tok
== '*' || tok
== '/' || tok
== '%') {
4402 ST_FUNC
void expr_sum(void)
4407 while (tok
== '+' || tok
== '-') {
4415 static void expr_shift(void)
4420 while (tok
== TOK_SHL
|| tok
== TOK_SAR
) {
4428 static void expr_cmp(void)
4433 while ((tok
>= TOK_ULE
&& tok
<= TOK_GT
) ||
4434 tok
== TOK_ULT
|| tok
== TOK_UGE
) {
4442 static void expr_cmpeq(void)
4447 while (tok
== TOK_EQ
|| tok
== TOK_NE
) {
4455 static void expr_and(void)
4458 while (tok
== '&') {
4465 static void expr_xor(void)
4468 while (tok
== '^') {
4475 static void expr_or(void)
4478 while (tok
== '|') {
4485 /* XXX: fix this mess */
4486 static void expr_land_const(void)
4489 while (tok
== TOK_LAND
) {
4495 static void expr_lor_const(void)
4498 while (tok
== TOK_LOR
) {
4505 static void expr_land(void)
4508 if (tok
== TOK_LAND
) {
4509 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
4520 int saved_nocode_wanted
= nocode_wanted
;
4524 nocode_wanted
= saved_nocode_wanted
;
4532 if (tok
!= TOK_LAND
) {
4543 static void expr_lor(void)
4546 if (tok
== TOK_LOR
) {
4547 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
4554 int saved_nocode_wanted
= nocode_wanted
;
4558 nocode_wanted
= saved_nocode_wanted
;
4570 if (tok
!= TOK_LOR
) {
4581 static void expr_cond(void)
4583 int tt
, u
, r1
, r2
, rc
, t1
, t2
, bt1
, bt2
, islv
;
4585 CType type
, type1
, type2
;
4590 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
4591 int saved_nocode_wanted
= nocode_wanted
;
4594 boolean
.t
= VT_BOOL
;
4600 if (tok
!= ':' || !gnu_ext
) {
4608 nocode_wanted
= saved_nocode_wanted
;
4611 if (tok
!= ':' || !gnu_ext
) {
4615 nocode_wanted
= saved_nocode_wanted
;
4622 if (vtop
!= vstack
) {
4623 /* needed to avoid having different registers saved in
4625 if (is_float(vtop
->type
.t
)) {
4627 #ifdef TCC_TARGET_X86_64
4628 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4638 if (tok
== ':' && gnu_ext
) {
4646 sv
= *vtop
; /* save value to handle it later */
4647 vtop
--; /* no vpop so that FP stack is not flushed */
4655 bt1
= t1
& VT_BTYPE
;
4657 bt2
= t2
& VT_BTYPE
;
4658 /* cast operands to correct type according to ISOC rules */
4659 if (is_float(bt1
) || is_float(bt2
)) {
4660 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
4661 type
.t
= VT_LDOUBLE
;
4662 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
4667 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
4668 /* cast to biggest op */
4670 /* convert to unsigned if it does not fit in a long long */
4671 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
4672 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
4673 type
.t
|= VT_UNSIGNED
;
4674 } else if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
4675 /* If one is a null ptr constant the result type
4677 if (is_null_pointer (vtop
))
4679 else if (is_null_pointer (&sv
))
4681 /* XXX: test pointer compatibility, C99 has more elaborate
4685 } else if (bt1
== VT_FUNC
|| bt2
== VT_FUNC
) {
4686 /* XXX: test function pointer compatibility */
4687 type
= bt1
== VT_FUNC
? type1
: type2
;
4688 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
4689 /* XXX: test structure compatibility */
4690 type
= bt1
== VT_STRUCT
? type1
: type2
;
4691 } else if (bt1
== VT_VOID
|| bt2
== VT_VOID
) {
4692 /* NOTE: as an extension, we accept void on only one side */
4695 /* integer operations */
4697 /* convert to unsigned if it does not fit in an integer */
4698 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
4699 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
4700 type
.t
|= VT_UNSIGNED
;
4702 /* keep structs lvalue by transforming `(expr ? a : b)` to `*(expr ? &a : &b)` so
4703 that `(expr ? a : b).mem` does not error with "lvalue expected" */
4704 islv
= (vtop
->r
& VT_LVAL
) && (sv
.r
& VT_LVAL
) && VT_STRUCT
== (type
.t
& VT_BTYPE
);
4706 /* now we convert second operand */
4709 mk_pointer(&vtop
->type
);
4712 else if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4715 if (is_float(type
.t
)) {
4717 #ifdef TCC_TARGET_X86_64
4718 if ((type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4722 } else if ((type
.t
& VT_BTYPE
) == VT_LLONG
) {
4723 /* for long longs, we use fixed registers to avoid having
4724 to handle a complicated move */
4729 /* this is horrible, but we must also convert first
4733 /* put again first value and cast it */
4737 mk_pointer(&vtop
->type
);
4740 else if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4743 move_reg(r2
, r1
, type
.t
);
4752 static void expr_eq(void)
4758 (tok
>= TOK_A_MOD
&& tok
<= TOK_A_DIV
) ||
4759 tok
== TOK_A_XOR
|| tok
== TOK_A_OR
||
4760 tok
== TOK_A_SHL
|| tok
== TOK_A_SAR
) {
4775 ST_FUNC
void gexpr(void)
4786 /* parse an expression and return its type without any side effect. */
4787 static void expr_type(CType
*type
)
4789 int saved_nocode_wanted
;
4791 saved_nocode_wanted
= nocode_wanted
;
4796 nocode_wanted
= saved_nocode_wanted
;
4799 /* parse a unary expression and return its type without any side
4801 static void unary_type(CType
*type
)
4813 /* parse a constant expression and return value in vtop. */
4814 static void expr_const1(void)
4823 /* parse an integer constant and return its value. */
4824 ST_FUNC
int expr_const(void)
4828 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
4829 expect("constant expression");
4835 /* return the label token if current token is a label, otherwise
4837 static int is_label(void)
4841 /* fast test first */
4842 if (tok
< TOK_UIDENT
)
4844 /* no need to save tokc because tok is an identifier */
4851 unget_tok(last_tok
);
4856 static void label_or_decl(int l
)
4860 /* fast test first */
4861 if (tok
>= TOK_UIDENT
)
4863 /* no need to save tokc because tok is an identifier */
4867 unget_tok(last_tok
);
4870 unget_tok(last_tok
);
4875 static void block(int *bsym
, int *csym
, int *case_sym
, int *def_sym
,
4876 int case_reg
, int is_expr
)
4881 /* generate line number info */
4882 if (tcc_state
->do_debug
&&
4883 (last_line_num
!= file
->line_num
|| last_ind
!= ind
)) {
4884 put_stabn(N_SLINE
, 0, file
->line_num
, ind
- func_ind
);
4886 last_line_num
= file
->line_num
;
4890 /* default return value is (void) */
4892 vtop
->type
.t
= VT_VOID
;
4895 if (tok
== TOK_IF
) {
4902 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4904 if (c
== TOK_ELSE
) {
4908 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4909 gsym(d
); /* patch else jmp */
4912 } else if (tok
== TOK_WHILE
) {
4921 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4926 } else if (tok
== '{') {
4928 int block_vla_sp_loc
= vla_sp_loc
, saved_vlas_in_scope
= vlas_in_scope
;
4931 /* record local declaration stack position */
4933 llabel
= local_label_stack
;
4936 /* handle local labels declarations */
4937 if (tok
== TOK_LABEL
) {
4940 if (tok
< TOK_UIDENT
)
4941 expect("label identifier");
4942 label_push(&local_label_stack
, tok
, LABEL_DECLARED
);
4952 while (tok
!= '}') {
4953 label_or_decl(VT_LOCAL
);
4957 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
4960 /* pop locally defined labels */
4961 label_pop(&local_label_stack
, llabel
);
4963 /* XXX: this solution makes only valgrind happy...
4964 triggered by gcc.c-torture/execute/20000917-1.c */
4966 switch(vtop
->type
.t
& VT_BTYPE
) {
4968 /* this breaks a compilation of the linux kernel v2.4.26 */
4969 /* pmd_t *new = ({ __asm__ __volatile__("ud2\n") ; ((pmd_t *)1); }); */
4970 /* Look a commit a80acab: Display error on statement expressions with complex return type */
4971 /* A pointer is not a complex return type */
4975 for(p
=vtop
->type
.ref
;p
;p
=p
->prev
)
4977 tcc_error("unsupported expression type");
4980 /* pop locally defined symbols */
4982 sym_pop(&local_stack
, s
);
4984 /* Pop VLA frames and restore stack pointer if required */
4985 if (vlas_in_scope
> saved_vlas_in_scope
) {
4986 vla_sp_loc
= saved_vlas_in_scope
? block_vla_sp_loc
: vla_sp_root_loc
;
4989 vlas_in_scope
= saved_vlas_in_scope
;
4992 } else if (tok
== TOK_RETURN
) {
4996 gen_assign_cast(&func_vt
);
4997 #ifdef TCC_TARGET_ARM64
4998 // Perhaps it would be better to use this for all backends:
5001 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
5002 CType type
, ret_type
;
5003 int ret_align
, ret_nregs
, regsize
;
5004 ret_nregs
= gfunc_sret(&func_vt
, func_var
, &ret_type
,
5005 &ret_align
, ®size
);
5006 if (0 == ret_nregs
) {
5007 /* if returning structure, must copy it to implicit
5008 first pointer arg location */
5011 vset(&type
, VT_LOCAL
| VT_LVAL
, func_vc
);
5014 /* copy structure value to pointer */
5017 /* returning structure packed into registers */
5018 int r
, size
, addr
, align
;
5019 size
= type_size(&func_vt
,&align
);
5020 if ((vtop
->r
!= (VT_LOCAL
| VT_LVAL
) ||
5021 (vtop
->c
.i
& (ret_align
-1)))
5022 && (align
& (ret_align
-1))) {
5023 loc
= (loc
- size
) & -ret_align
;
5026 vset(&type
, VT_LOCAL
| VT_LVAL
, addr
);
5030 vset(&ret_type
, VT_LOCAL
| VT_LVAL
, addr
);
5032 vtop
->type
= ret_type
;
5033 if (is_float(ret_type
.t
))
5034 r
= rc_fret(ret_type
.t
);
5040 if (--ret_nregs
== 0)
5042 /* We assume that when a structure is returned in multiple
5043 registers, their classes are consecutive values of the
5046 vtop
->c
.i
+= regsize
;
5047 vtop
->r
= VT_LOCAL
| VT_LVAL
;
5050 } else if (is_float(func_vt
.t
)) {
5051 gv(rc_fret(func_vt
.t
));
5056 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
5059 rsym
= gjmp(rsym
); /* jmp */
5060 } else if (tok
== TOK_BREAK
) {
5063 tcc_error("cannot break");
5064 *bsym
= gjmp(*bsym
);
5067 } else if (tok
== TOK_CONTINUE
) {
5070 tcc_error("cannot continue");
5071 vla_sp_restore_root();
5072 *csym
= gjmp(*csym
);
5075 } else if (tok
== TOK_FOR
) {
5082 /* c99 for-loop init decl? */
5083 if (!decl0(VT_LOCAL
, 1)) {
5084 /* no, regular for-loop init expr */
5110 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
5116 sym_pop(&local_stack
, s
);
5119 if (tok
== TOK_DO
) {
5125 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
5136 if (tok
== TOK_SWITCH
) {
5140 /* XXX: other types than integer */
5141 case_reg
= gv(RC_INT
);
5145 b
= gjmp(0); /* jump to first case */
5147 block(&a
, csym
, &b
, &c
, case_reg
, 0);
5148 /* if no default, jmp after switch */
5156 if (tok
== TOK_CASE
) {
5163 if (gnu_ext
&& tok
== TOK_DOTS
) {
5167 tcc_warning("empty case range");
5169 /* since a case is like a label, we must skip it with a jmp */
5177 *case_sym
= gtst(1, 0);
5180 *case_sym
= gtst(1, 0);
5184 *case_sym
= gtst(1, *case_sym
);
5186 case_reg
= gv(RC_INT
);
5191 goto block_after_label
;
5193 if (tok
== TOK_DEFAULT
) {
5199 tcc_error("too many 'default'");
5202 goto block_after_label
;
5204 if (tok
== TOK_GOTO
) {
5206 if (tok
== '*' && gnu_ext
) {
5210 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
)
5213 } else if (tok
>= TOK_UIDENT
) {
5214 s
= label_find(tok
);
5215 /* put forward definition if needed */
5217 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
5219 if (s
->r
== LABEL_DECLARED
)
5220 s
->r
= LABEL_FORWARD
;
5222 vla_sp_restore_root();
5223 if (s
->r
& LABEL_FORWARD
)
5224 s
->jnext
= gjmp(s
->jnext
);
5226 gjmp_addr(s
->jnext
);
5229 expect("label identifier");
5232 } else if (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
) {
5240 if (s
->r
== LABEL_DEFINED
)
5241 tcc_error("duplicate label '%s'", get_tok_str(s
->v
, NULL
));
5243 s
->r
= LABEL_DEFINED
;
5245 s
= label_push(&global_label_stack
, b
, LABEL_DEFINED
);
5249 /* we accept this, but it is a mistake */
5252 tcc_warning("deprecated use of label at end of compound statement");
5256 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
5259 /* expression case */
5274 /* t is the array or struct type. c is the array or struct
5275 address. cur_index/cur_field is the pointer to the current
5276 value. 'size_only' is true if only size info is needed (only used
5278 static void decl_designator(CType
*type
, Section
*sec
, unsigned long c
,
5279 int *cur_index
, Sym
**cur_field
,
5283 int notfirst
, index
, index_last
, align
, l
, nb_elems
, elem_size
;
5289 if (gnu_ext
&& (l
= is_label()) != 0)
5291 while (tok
== '[' || tok
== '.') {
5293 if (!(type
->t
& VT_ARRAY
))
5294 expect("array type");
5297 index
= expr_const();
5298 if (index
< 0 || (s
->c
>= 0 && index
>= s
->c
))
5299 expect("invalid index");
5300 if (tok
== TOK_DOTS
&& gnu_ext
) {
5302 index_last
= expr_const();
5303 if (index_last
< 0 ||
5304 (s
->c
>= 0 && index_last
>= s
->c
) ||
5306 expect("invalid index");
5312 *cur_index
= index_last
;
5313 type
= pointed_type(type
);
5314 elem_size
= type_size(type
, &align
);
5315 c
+= index
* elem_size
;
5316 /* NOTE: we only support ranges for last designator */
5317 nb_elems
= index_last
- index
+ 1;
5318 if (nb_elems
!= 1) {
5327 if ((type
->t
& VT_BTYPE
) != VT_STRUCT
)
5328 expect("struct/union type");
5341 /* XXX: fix this mess by using explicit storage field */
5343 type1
.t
|= (type
->t
& ~VT_TYPE
);
5357 if (type
->t
& VT_ARRAY
) {
5359 type
= pointed_type(type
);
5360 c
+= index
* type_size(type
, &align
);
5364 tcc_error("too many field init");
5365 /* XXX: fix this mess by using explicit storage field */
5367 type1
.t
|= (type
->t
& ~VT_TYPE
);
5372 decl_initializer(type
, sec
, c
, 0, size_only
);
5374 /* XXX: make it more general */
5375 if (!size_only
&& nb_elems
> 1) {
5376 unsigned long c_end
;
5381 tcc_error("range init not supported yet for dynamic storage");
5382 c_end
= c
+ nb_elems
* elem_size
;
5383 if (c_end
> sec
->data_allocated
)
5384 section_realloc(sec
, c_end
);
5385 src
= sec
->data
+ c
;
5387 for(i
= 1; i
< nb_elems
; i
++) {
5389 memcpy(dst
, src
, elem_size
);
5395 #define EXPR_CONST 1
5398 /* store a value or an expression directly in global data or in local array */
5399 static void init_putv(CType
*type
, Section
*sec
, unsigned long c
,
5400 int v
, int expr_type
)
5402 int saved_global_expr
, bt
, bit_pos
, bit_size
;
5404 unsigned long long bit_mask
;
5412 /* compound literals must be allocated globally in this case */
5413 saved_global_expr
= global_expr
;
5416 global_expr
= saved_global_expr
;
5417 /* NOTE: symbols are accepted */
5418 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) != VT_CONST
)
5419 tcc_error("initializer element is not constant");
5427 dtype
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
5430 /* XXX: not portable */
5431 /* XXX: generate error if incorrect relocation */
5432 gen_assign_cast(&dtype
);
5433 bt
= type
->t
& VT_BTYPE
;
5434 /* we'll write at most 16 bytes */
5435 if (c
+ 16 > sec
->data_allocated
) {
5436 section_realloc(sec
, c
+ 16);
5438 ptr
= sec
->data
+ c
;
5439 /* XXX: make code faster ? */
5440 if (!(type
->t
& VT_BITFIELD
)) {
5445 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5446 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
5447 bit_mask
= (1LL << bit_size
) - 1;
5449 if ((vtop
->r
& VT_SYM
) &&
5455 (bt
== VT_INT
&& bit_size
!= 32)))
5456 tcc_error("initializer element is not computable at load time");
5458 /* XXX: when cross-compiling we assume that each type has the
5459 same representation on host and target, which is likely to
5460 be wrong in the case of long double */
5462 vtop
->c
.i
= (vtop
->c
.i
!= 0);
5464 *(char *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5467 *(short *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5470 *(double *)ptr
= vtop
->c
.d
;
5473 *(long double *)ptr
= vtop
->c
.ld
;
5476 *(long long *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5479 addr_t val
= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5480 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
5481 if (vtop
->r
& VT_SYM
)
5482 greloca(sec
, vtop
->sym
, c
, R_DATA_PTR
, val
);
5484 *(addr_t
*)ptr
|= val
;
5486 if (vtop
->r
& VT_SYM
)
5487 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
5488 *(addr_t
*)ptr
|= val
;
5493 int val
= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5494 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
5495 if (vtop
->r
& VT_SYM
)
5496 greloca(sec
, vtop
->sym
, c
, R_DATA_PTR
, val
);
5500 if (vtop
->r
& VT_SYM
)
5501 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
5509 vset(&dtype
, VT_LOCAL
|VT_LVAL
, c
);
5516 /* put zeros for variable based init */
5517 static void init_putz(CType
*t
, Section
*sec
, unsigned long c
, int size
)
5520 /* nothing to do because globals are already set to zero */
5522 vpush_global_sym(&func_old_type
, TOK_memset
);
5524 #ifdef TCC_TARGET_ARM
5535 /* 't' contains the type and storage info. 'c' is the offset of the
5536 object in section 'sec'. If 'sec' is NULL, it means stack based
5537 allocation. 'first' is true if array '{' must be read (multi
5538 dimension implicit array init handling). 'size_only' is true if
5539 size only evaluation is wanted (only for arrays). */
5540 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
,
5541 int first
, int size_only
)
5543 int index
, array_length
, n
, no_oblock
, nb
, parlevel
, parlevel1
, i
;
5544 int size1
, align1
, expr_type
;
5548 if (type
->t
& VT_VLA
) {
5551 /* save current stack pointer */
5552 if (vlas_in_scope
== 0) {
5553 if (vla_sp_root_loc
== -1)
5554 vla_sp_root_loc
= (loc
-= PTR_SIZE
);
5555 gen_vla_sp_save(vla_sp_root_loc
);
5558 vla_runtime_type_size(type
, &a
);
5559 gen_vla_alloc(type
, a
);
5563 } else if (type
->t
& VT_ARRAY
) {
5567 t1
= pointed_type(type
);
5568 size1
= type_size(t1
, &align1
);
5571 if ((first
&& tok
!= TOK_LSTR
&& tok
!= TOK_STR
) ||
5574 tcc_error("character array initializer must be a literal,"
5575 " optionally enclosed in braces");
5580 /* only parse strings here if correct type (otherwise: handle
5581 them as ((w)char *) expressions */
5582 if ((tok
== TOK_LSTR
&&
5583 #ifdef TCC_TARGET_PE
5584 (t1
->t
& VT_BTYPE
) == VT_SHORT
&& (t1
->t
& VT_UNSIGNED
)
5586 (t1
->t
& VT_BTYPE
) == VT_INT
5588 ) || (tok
== TOK_STR
&& (t1
->t
& VT_BTYPE
) == VT_BYTE
)) {
5589 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5592 /* compute maximum number of chars wanted */
5594 cstr_len
= tokc
.str
.size
;
5596 cstr_len
= tokc
.str
.size
/ sizeof(nwchar_t
);
5599 if (n
>= 0 && nb
> (n
- array_length
))
5600 nb
= n
- array_length
;
5603 tcc_warning("initializer-string for array is too long");
5604 /* in order to go faster for common case (char
5605 string in global variable, we handle it
5607 if (sec
&& tok
== TOK_STR
&& size1
== 1) {
5608 memcpy(sec
->data
+ c
+ array_length
, tokc
.str
.data
, nb
);
5612 ch
= ((unsigned char *)tokc
.str
.data
)[i
];
5614 ch
= ((nwchar_t
*)tokc
.str
.data
)[i
];
5615 init_putv(t1
, sec
, c
+ (array_length
+ i
) * size1
,
5623 /* only add trailing zero if enough storage (no
5624 warning in this case since it is standard) */
5625 if (n
< 0 || array_length
< n
) {
5627 init_putv(t1
, sec
, c
+ (array_length
* size1
), 0, EXPR_VAL
);
5633 while (tok
!= '}') {
5634 decl_designator(type
, sec
, c
, &index
, NULL
, size_only
);
5635 if (n
>= 0 && index
>= n
)
5636 tcc_error("index too large");
5637 /* must put zero in holes (note that doing it that way
5638 ensures that it even works with designators) */
5639 if (!size_only
&& array_length
< index
) {
5640 init_putz(t1
, sec
, c
+ array_length
* size1
,
5641 (index
- array_length
) * size1
);
5644 if (index
> array_length
)
5645 array_length
= index
;
5646 /* special test for multi dimensional arrays (may not
5647 be strictly correct if designators are used at the
5649 if (index
>= n
&& no_oblock
)
5658 /* put zeros at the end */
5659 if (!size_only
&& n
>= 0 && array_length
< n
) {
5660 init_putz(t1
, sec
, c
+ array_length
* size1
,
5661 (n
- array_length
) * size1
);
5663 /* patch type size if needed */
5665 s
->c
= array_length
;
5666 } else if ((type
->t
& VT_BTYPE
) == VT_STRUCT
&&
5667 (sec
|| !first
|| tok
== '{')) {
5669 /* NOTE: the previous test is a specific case for automatic
5670 struct/union init */
5671 /* XXX: union needs only one init */
5678 if (tcc_state
->old_struct_init_code
) {
5679 /* an old version of struct initialization.
5680 It have a problems. But with a new version
5681 linux 2.4.26 can't load ramdisk.
5683 while (tok
== '(') {
5687 if (!parse_btype(&type1
, &ad1
))
5689 type_decl(&type1
, &ad1
, &n
, TYPE_ABSTRACT
);
5691 if (!is_assignable_types(type
, &type1
))
5692 tcc_error("invalid type for cast");
5699 if (!parse_btype(&type1
, &ad1
))
5701 type_decl(&type1
, &ad1
, &n
, TYPE_ABSTRACT
);
5703 if (!is_assignable_types(type
, &type1
))
5704 tcc_error("invalid type for cast");
5713 if (first
|| tok
== '{') {
5722 while (tok
!= '}') {
5723 decl_designator(type
, sec
, c
, NULL
, &f
, size_only
);
5725 if (!size_only
&& array_length
< index
) {
5726 init_putz(type
, sec
, c
+ array_length
,
5727 index
- array_length
);
5729 index
= index
+ type_size(&f
->type
, &align1
);
5730 if (index
> array_length
)
5731 array_length
= index
;
5733 /* gr: skip fields from same union - ugly. */
5736 int f_size
= type_size(&f
->type
, &align
);
5737 int f_type
= (f
->type
.t
& VT_BTYPE
);
5739 ///printf("index: %2d %08x -- %2d %08x\n", f->c, f->type.t, f->next->c, f->next->type.t);
5740 /* test for same offset */
5741 if (f
->next
->c
!= f
->c
)
5743 if ((f_type
== VT_STRUCT
) && (f_size
== 0)) {
5745 Lets assume a structure of size 0 can't be a member of the union.
5746 This allow to compile the following code from a linux kernel v2.4.26
5747 typedef struct { } rwlock_t;
5753 struct fs_struct init_fs = { { (1) }, (rwlock_t) {}, 0022, };
5754 tcc-0.9.23 can succesfully compile this version of the kernel.
5755 gcc don't have problems with this code too.
5759 /* if yes, test for bitfield shift */
5760 if ((f
->type
.t
& VT_BITFIELD
) && (f
->next
->type
.t
& VT_BITFIELD
)) {
5761 int bit_pos_1
= (f
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5762 int bit_pos_2
= (f
->next
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5763 //printf("bitfield %d %d\n", bit_pos_1, bit_pos_2);
5764 if (bit_pos_1
!= bit_pos_2
)
5771 if (no_oblock
&& f
== NULL
)
5777 /* put zeros at the end */
5778 if (!size_only
&& array_length
< n
) {
5779 init_putz(type
, sec
, c
+ array_length
,
5788 } else if (tok
== '{') {
5790 decl_initializer(type
, sec
, c
, first
, size_only
);
5792 } else if (size_only
) {
5793 /* just skip expression */
5794 parlevel
= parlevel1
= 0;
5795 while ((parlevel
> 0 || parlevel1
> 0 ||
5796 (tok
!= '}' && tok
!= ',')) && tok
!= -1) {
5799 else if (tok
== ')') {
5800 if (parlevel
== 0 && parlevel1
== 0)
5804 else if (tok
== '{')
5806 else if (tok
== '}') {
5807 if (parlevel
== 0 && parlevel1
== 0)
5814 /* currently, we always use constant expression for globals
5815 (may change for scripting case) */
5816 expr_type
= EXPR_CONST
;
5818 expr_type
= EXPR_ANY
;
5819 init_putv(type
, sec
, c
, 0, expr_type
);
5823 /* parse an initializer for type 't' if 'has_init' is non zero, and
5824 allocate space in local or global data space ('r' is either
5825 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
5826 variable 'v' of scope 'scope' is declared before initializers
5827 are parsed. If 'v' is zero, then a reference to the new object
5828 is put in the value stack. If 'has_init' is 2, a special parsing
5829 is done to handle string constants. */
5830 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
,
5831 int has_init
, int v
, int scope
)
5833 int size
, align
, addr
, data_offset
;
5835 ParseState saved_parse_state
= {0};
5836 TokenString init_str
;
5838 Sym
*flexible_array
;
5840 flexible_array
= NULL
;
5841 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
5842 Sym
*field
= type
->ref
->next
;
5845 field
= field
->next
;
5846 if (field
->type
.t
& VT_ARRAY
&& field
->type
.ref
->c
< 0)
5847 flexible_array
= field
;
5851 size
= type_size(type
, &align
);
5852 /* If unknown size, we must evaluate it before
5853 evaluating initializers because
5854 initializers can generate global data too
5855 (e.g. string pointers or ISOC99 compound
5856 literals). It also simplifies local
5857 initializers handling */
5858 tok_str_new(&init_str
);
5859 if (size
< 0 || (flexible_array
&& has_init
)) {
5861 tcc_error("unknown type size");
5862 /* get all init string */
5863 if (has_init
== 2) {
5864 /* only get strings */
5865 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5866 tok_str_add_tok(&init_str
);
5871 while (level
> 0 || (tok
!= ',' && tok
!= ';')) {
5873 tcc_error("unexpected end of file in initializer");
5874 tok_str_add_tok(&init_str
);
5877 else if (tok
== '}') {
5887 tok_str_add(&init_str
, -1);
5888 tok_str_add(&init_str
, 0);
5891 save_parse_state(&saved_parse_state
);
5893 begin_macro(&init_str
, 0);
5895 decl_initializer(type
, NULL
, 0, 1, 1);
5896 /* prepare second initializer parsing */
5897 macro_ptr
= init_str
.str
;
5900 /* if still unknown size, error */
5901 size
= type_size(type
, &align
);
5903 tcc_error("unknown type size");
5905 /* If there's a flex member and it was used in the initializer
5907 if (flexible_array
&&
5908 flexible_array
->type
.ref
->c
> 0)
5909 size
+= flexible_array
->type
.ref
->c
5910 * pointed_size(&flexible_array
->type
);
5911 /* take into account specified alignment if bigger */
5912 if (ad
->a
.aligned
) {
5913 if (ad
->a
.aligned
> align
)
5914 align
= ad
->a
.aligned
;
5915 } else if (ad
->a
.packed
) {
5918 if ((r
& VT_VALMASK
) == VT_LOCAL
) {
5920 #ifdef CONFIG_TCC_BCHECK
5921 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5925 loc
= (loc
- size
) & -align
;
5927 #ifdef CONFIG_TCC_BCHECK
5928 /* handles bounds */
5929 /* XXX: currently, since we do only one pass, we cannot track
5930 '&' operators, so we add only arrays */
5931 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5933 /* add padding between regions */
5935 /* then add local bound info */
5936 bounds_ptr
= section_ptr_add(lbounds_section
, 2 * sizeof(addr_t
));
5937 bounds_ptr
[0] = addr
;
5938 bounds_ptr
[1] = size
;
5942 /* local variable */
5943 sym_push(v
, type
, r
, addr
);
5945 /* push local reference */
5946 vset(type
, r
, addr
);
5952 if (v
&& scope
== VT_CONST
) {
5953 /* see if the symbol was already defined */
5956 if (!is_compatible_types(&sym
->type
, type
))
5957 tcc_error("incompatible types for redefinition of '%s'",
5958 get_tok_str(v
, NULL
));
5959 if (sym
->type
.t
& VT_EXTERN
) {
5960 /* if the variable is extern, it was not allocated */
5961 sym
->type
.t
&= ~VT_EXTERN
;
5962 /* set array size if it was omitted in extern
5964 if ((sym
->type
.t
& VT_ARRAY
) &&
5965 sym
->type
.ref
->c
< 0 &&
5967 sym
->type
.ref
->c
= type
->ref
->c
;
5969 /* we accept several definitions of the same
5970 global variable. this is tricky, because we
5971 must play with the SHN_COMMON type of the symbol */
5972 /* XXX: should check if the variable was already
5973 initialized. It is incorrect to initialized it
5975 /* no init data, we won't add more to the symbol */
5982 /* allocate symbol in corresponding section */
5987 else if (tcc_state
->nocommon
)
5991 data_offset
= sec
->data_offset
;
5992 data_offset
= (data_offset
+ align
- 1) & -align
;
5994 /* very important to increment global pointer at this time
5995 because initializers themselves can create new initializers */
5996 data_offset
+= size
;
5997 #ifdef CONFIG_TCC_BCHECK
5998 /* add padding if bound check */
5999 if (tcc_state
->do_bounds_check
)
6002 sec
->data_offset
= data_offset
;
6003 /* allocate section space to put the data */
6004 if (sec
->sh_type
!= SHT_NOBITS
&&
6005 data_offset
> sec
->data_allocated
)
6006 section_realloc(sec
, data_offset
);
6007 /* align section if needed */
6008 if (align
> sec
->sh_addralign
)
6009 sec
->sh_addralign
= align
;
6011 addr
= 0; /* avoid warning */
6015 if (scope
!= VT_CONST
|| !sym
) {
6016 sym
= sym_push(v
, type
, r
| VT_SYM
, 0);
6017 sym
->asm_label
= ad
->asm_label
;
6019 /* update symbol definition */
6021 put_extern_sym(sym
, sec
, addr
, size
);
6024 /* put a common area */
6025 put_extern_sym(sym
, NULL
, align
, size
);
6026 /* XXX: find a nicer way */
6027 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
6028 esym
->st_shndx
= SHN_COMMON
;
6031 /* push global reference */
6032 sym
= get_sym_ref(type
, sec
, addr
, size
);
6033 vpushsym(type
, sym
);
6035 /* patch symbol weakness */
6036 if (type
->t
& VT_WEAK
)
6038 apply_visibility(sym
, type
);
6039 #ifdef CONFIG_TCC_BCHECK
6040 /* handles bounds now because the symbol must be defined
6041 before for the relocation */
6042 if (tcc_state
->do_bounds_check
) {
6045 greloc(bounds_section
, sym
, bounds_section
->data_offset
, R_DATA_PTR
);
6046 /* then add global bound info */
6047 bounds_ptr
= section_ptr_add(bounds_section
, 2 * sizeof(addr_t
));
6048 bounds_ptr
[0] = 0; /* relocated */
6049 bounds_ptr
[1] = size
;
6053 if (has_init
|| (type
->t
& VT_VLA
)) {
6054 decl_initializer(type
, sec
, addr
, 1, 0);
6055 /* restore parse state if needed */
6058 restore_parse_state(&saved_parse_state
);
6060 /* patch flexible array member size back to -1, */
6061 /* for possible subsequent similar declarations */
6063 flexible_array
->type
.ref
->c
= -1;
6068 static void put_func_debug(Sym
*sym
)
6073 /* XXX: we put here a dummy type */
6074 snprintf(buf
, sizeof(buf
), "%s:%c1",
6075 funcname
, sym
->type
.t
& VT_STATIC
? 'f' : 'F');
6076 put_stabs_r(buf
, N_FUN
, 0, file
->line_num
, 0,
6077 cur_text_section
, sym
->c
);
6078 /* //gr gdb wants a line at the function */
6079 put_stabn(N_SLINE
, 0, file
->line_num
, 0);
6084 /* parse an old style function declaration list */
6085 /* XXX: check multiple parameter */
6086 static void func_decl_list(Sym
*func_sym
)
6093 /* parse each declaration */
6094 while (tok
!= '{' && tok
!= ';' && tok
!= ',' && tok
!= TOK_EOF
&&
6095 tok
!= TOK_ASM1
&& tok
!= TOK_ASM2
&& tok
!= TOK_ASM3
) {
6096 if (!parse_btype(&btype
, &ad
))
6097 expect("declaration list");
6098 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
6099 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
6101 /* we accept no variable after */
6105 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
6106 /* find parameter in function parameter list */
6109 if ((s
->v
& ~SYM_FIELD
) == v
)
6113 tcc_error("declaration for parameter '%s' but no such parameter",
6114 get_tok_str(v
, NULL
));
6116 /* check that no storage specifier except 'register' was given */
6117 if (type
.t
& VT_STORAGE
)
6118 tcc_error("storage class specified for '%s'", get_tok_str(v
, NULL
));
6119 convert_parameter_type(&type
);
6120 /* we can add the type (NOTE: it could be local to the function) */
6122 /* accept other parameters */
6133 /* parse a function defined by symbol 'sym' and generate its code in
6134 'cur_text_section' */
6135 static void gen_function(Sym
*sym
)
6137 int saved_nocode_wanted
= nocode_wanted
;
6140 ind
= cur_text_section
->data_offset
;
6141 /* NOTE: we patch the symbol size later */
6142 put_extern_sym(sym
, cur_text_section
, ind
, 0);
6143 funcname
= get_tok_str(sym
->v
, NULL
);
6145 /* Initialize VLA state */
6147 vla_sp_root_loc
= -1;
6148 /* put debug symbol */
6149 if (tcc_state
->do_debug
)
6150 put_func_debug(sym
);
6152 /* push a dummy symbol to enable local sym storage */
6153 sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
6154 local_scope
= 1; /* for function parameters */
6155 gfunc_prolog(&sym
->type
);
6158 #ifdef CONFIG_TCC_BCHECK
6159 if (tcc_state
->do_bounds_check
&& !strcmp(funcname
, "main")) {
6162 for (i
= 0, sym
= local_stack
; i
< 2; i
++, sym
= sym
->prev
) {
6163 if (sym
->v
& SYM_FIELD
|| sym
->prev
->v
& SYM_FIELD
)
6165 vpush_global_sym(&func_old_type
, TOK___bound_main_arg
);
6166 vset(&sym
->type
, sym
->r
, sym
->c
);
6172 block(NULL
, NULL
, NULL
, NULL
, 0, 0);
6175 cur_text_section
->data_offset
= ind
;
6176 label_pop(&global_label_stack
, NULL
);
6177 /* reset local stack */
6179 sym_pop(&local_stack
, NULL
);
6180 /* end of function */
6181 /* patch symbol size */
6182 ((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
].st_size
=
6184 /* patch symbol weakness (this definition overrules any prototype) */
6185 if (sym
->type
.t
& VT_WEAK
)
6187 apply_visibility(sym
, &sym
->type
);
6188 if (tcc_state
->do_debug
) {
6189 put_stabn(N_FUN
, 0, 0, ind
- func_ind
);
6191 /* It's better to crash than to generate wrong code */
6192 cur_text_section
= NULL
;
6193 funcname
= ""; /* for safety */
6194 func_vt
.t
= VT_VOID
; /* for safety */
6195 func_var
= 0; /* for safety */
6196 ind
= 0; /* for safety */
6197 nocode_wanted
= saved_nocode_wanted
;
6201 ST_FUNC
void gen_inline_functions(void)
6204 int inline_generated
, i
, ln
;
6205 struct InlineFunc
*fn
;
6207 ln
= file
->line_num
;
6208 /* iterate while inline function are referenced */
6210 inline_generated
= 0;
6211 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
6212 fn
= tcc_state
->inline_fns
[i
];
6214 if (sym
&& sym
->c
) {
6215 /* the function was used: generate its code and
6216 convert it to a normal function */
6219 pstrcpy(file
->filename
, sizeof file
->filename
, fn
->filename
);
6220 sym
->r
= VT_SYM
| VT_CONST
;
6221 sym
->type
.t
&= ~VT_INLINE
;
6223 begin_macro(&fn
->func_str
, 0);
6225 cur_text_section
= text_section
;
6229 inline_generated
= 1;
6232 if (!inline_generated
)
6235 file
->line_num
= ln
;
6236 /* free tokens of unused inline functions */
6237 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
6238 fn
= tcc_state
->inline_fns
[i
];
6240 tok_str_free(fn
->func_str
.str
);
6242 dynarray_reset(&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
);
6245 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
6246 static int decl0(int l
, int is_for_loop_init
)
6254 if (!parse_btype(&btype
, &ad
)) {
6255 if (is_for_loop_init
)
6257 /* skip redundant ';' */
6258 /* XXX: find more elegant solution */
6263 if (l
== VT_CONST
&&
6264 (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
6265 /* global asm block */
6269 /* special test for old K&R protos without explicit int
6270 type. Only accepted when defining global data */
6271 if (l
== VT_LOCAL
|| tok
< TOK_DEFINE
)
6275 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
6276 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
6278 if ((btype
.t
& VT_BTYPE
) == VT_STRUCT
) {
6279 int v
= btype
.ref
->v
;
6280 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) >= SYM_FIRST_ANOM
)
6281 tcc_warning("unnamed struct/union that defines no instances");
6286 while (1) { /* iterate thru each declaration */
6288 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
6292 type_to_str(buf
, sizeof(buf
), t
, get_tok_str(v
, NULL
));
6293 printf("type = '%s'\n", buf
);
6296 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
6297 if ((type
.t
& VT_STATIC
) && (l
== VT_LOCAL
)) {
6298 tcc_error("function without file scope cannot be static");
6300 /* if old style function prototype, we accept a
6303 if (sym
->c
== FUNC_OLD
)
6304 func_decl_list(sym
);
6307 if (gnu_ext
&& (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
6308 ad
.asm_label
= asm_label_instr();
6309 /* parse one last attribute list, after asm label */
6310 parse_attribute(&ad
);
6317 #ifdef TCC_TARGET_PE
6318 if (ad
.a
.func_import
)
6319 type
.t
|= VT_IMPORT
;
6320 if (ad
.a
.func_export
)
6321 type
.t
|= VT_EXPORT
;
6323 type
.t
|= ad
.a
.visibility
<< VT_VIS_SHIFT
;
6327 tcc_error("cannot use local functions");
6328 if ((type
.t
& VT_BTYPE
) != VT_FUNC
)
6329 expect("function definition");
6331 /* reject abstract declarators in function definition */
6333 while ((sym
= sym
->next
) != NULL
)
6334 if (!(sym
->v
& ~SYM_FIELD
))
6335 expect("identifier");
6337 /* XXX: cannot do better now: convert extern line to static inline */
6338 if ((type
.t
& (VT_EXTERN
| VT_INLINE
)) == (VT_EXTERN
| VT_INLINE
))
6339 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
6344 if ((sym
->type
.t
& VT_BTYPE
) != VT_FUNC
)
6347 ref
= sym
->type
.ref
;
6348 if (0 == ref
->a
.func_proto
)
6349 tcc_error("redefinition of '%s'", get_tok_str(v
, NULL
));
6351 /* use func_call from prototype if not defined */
6352 if (ref
->a
.func_call
!= FUNC_CDECL
6353 && type
.ref
->a
.func_call
== FUNC_CDECL
)
6354 type
.ref
->a
.func_call
= ref
->a
.func_call
;
6356 /* use export from prototype */
6357 if (ref
->a
.func_export
)
6358 type
.ref
->a
.func_export
= 1;
6360 /* use static from prototype */
6361 if (sym
->type
.t
& VT_STATIC
)
6362 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
6364 /* If the definition has no visibility use the
6365 one from prototype. */
6366 if (! (type
.t
& VT_VIS_MASK
))
6367 type
.t
|= sym
->type
.t
& VT_VIS_MASK
;
6369 if (!is_compatible_types(&sym
->type
, &type
)) {
6371 tcc_error("incompatible types for redefinition of '%s'",
6372 get_tok_str(v
, NULL
));
6374 type
.ref
->a
.func_proto
= 0;
6375 /* if symbol is already defined, then put complete type */
6378 /* put function symbol */
6379 sym
= global_identifier_push(v
, type
.t
, 0);
6380 sym
->type
.ref
= type
.ref
;
6383 /* static inline functions are just recorded as a kind
6384 of macro. Their code will be emitted at the end of
6385 the compilation unit only if they are used */
6386 if ((type
.t
& (VT_INLINE
| VT_STATIC
)) ==
6387 (VT_INLINE
| VT_STATIC
)) {
6389 struct InlineFunc
*fn
;
6390 const char *filename
;
6392 filename
= file
? file
->filename
: "";
6393 fn
= tcc_malloc(sizeof *fn
+ strlen(filename
));
6394 strcpy(fn
->filename
, filename
);
6396 tok_str_new(&fn
->func_str
);
6402 tcc_error("unexpected end of file");
6403 tok_str_add_tok(&fn
->func_str
);
6408 } else if (t
== '}') {
6410 if (block_level
== 0)
6414 tok_str_add(&fn
->func_str
, -1);
6415 tok_str_add(&fn
->func_str
, 0);
6416 dynarray_add((void ***)&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
, fn
);
6419 /* compute text section */
6420 cur_text_section
= ad
.section
;
6421 if (!cur_text_section
)
6422 cur_text_section
= text_section
;
6423 sym
->r
= VT_SYM
| VT_CONST
;
6428 if (btype
.t
& VT_TYPEDEF
) {
6429 /* save typedefed type */
6430 /* XXX: test storage specifiers ? */
6432 if (sym
&& sym
->scope
== local_scope
) {
6433 if (!is_compatible_types(&sym
->type
, &type
)
6434 || !(sym
->type
.t
& VT_TYPEDEF
))
6435 tcc_error("incompatible redefinition of '%s'",
6436 get_tok_str(v
, NULL
));
6439 sym
= sym_push(v
, &type
, 0, 0);
6442 sym
->type
.t
|= VT_TYPEDEF
;
6445 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
6446 /* external function definition */
6447 /* specific case for func_call attribute */
6448 ad
.a
.func_proto
= 1;
6450 } else if (!(type
.t
& VT_ARRAY
)) {
6451 /* not lvalue if array */
6452 r
|= lvalue_type(type
.t
);
6454 has_init
= (tok
== '=');
6455 if (has_init
&& (type
.t
& VT_VLA
))
6456 tcc_error("Variable length array cannot be initialized");
6457 if ((btype
.t
& VT_EXTERN
) || ((type
.t
& VT_BTYPE
) == VT_FUNC
) ||
6458 ((type
.t
& VT_ARRAY
) && (type
.t
& VT_STATIC
) &&
6459 !has_init
&& l
== VT_CONST
&& type
.ref
->c
< 0)) {
6460 /* external variable or function */
6461 /* NOTE: as GCC, uninitialized global static
6462 arrays of null size are considered as
6464 sym
= external_sym(v
, &type
, r
);
6465 sym
->asm_label
= ad
.asm_label
;
6467 if (ad
.alias_target
) {
6472 alias_target
= sym_find(ad
.alias_target
);
6473 if (!alias_target
|| !alias_target
->c
)
6474 tcc_error("unsupported forward __alias__ attribute");
6475 esym
= &((Elf32_Sym
*)symtab_section
->data
)[alias_target
->c
];
6476 tsec
.sh_num
= esym
->st_shndx
;
6477 put_extern_sym2(sym
, &tsec
, esym
->st_value
, esym
->st_size
, 0);
6480 type
.t
|= (btype
.t
& VT_STATIC
); /* Retain "static". */
6481 if (type
.t
& VT_STATIC
)
6487 decl_initializer_alloc(&type
, &ad
, r
, has_init
, v
, l
);
6491 if (is_for_loop_init
)
6504 ST_FUNC
void decl(int l
)