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 Sym
*sym_free_first
;
34 ST_DATA
void **sym_pools
;
35 ST_DATA
int nb_sym_pools
;
37 ST_DATA Sym
*global_stack
;
38 ST_DATA Sym
*local_stack
;
39 ST_DATA Sym
*define_stack
;
40 ST_DATA Sym
*global_label_stack
;
41 ST_DATA Sym
*local_label_stack
;
42 static int local_scope
;
44 static int section_sym
;
46 ST_DATA
int vlas_in_scope
; /* number of VLAs that are currently in scope */
47 ST_DATA
int vla_sp_root_loc
; /* vla_sp_loc for SP before any VLAs were pushed */
48 ST_DATA
int vla_sp_loc
; /* Pointer to variable holding location to store stack pointer on the stack when modifying stack pointer */
50 ST_DATA SValue __vstack
[1+VSTACK_SIZE
], *vtop
, *pvtop
;
52 ST_DATA
int const_wanted
; /* true if constant wanted */
53 ST_DATA
int nocode_wanted
; /* true if no code generation wanted for an expression */
54 ST_DATA
int global_expr
; /* true if compound literals must be allocated globally (used during initializers parsing */
55 ST_DATA CType func_vt
; /* current function return type (used by return instruction) */
56 ST_DATA
int func_var
; /* true if current function is variadic (used by return instruction) */
58 ST_DATA
int last_line_num
, last_ind
, func_ind
; /* debug last line number and pc */
59 ST_DATA
const char *funcname
;
61 ST_DATA CType char_pointer_type
, func_old_type
, int_type
, size_type
;
63 ST_DATA
struct switch_t
{
67 } **p
; int n
; /* list of case ranges */
68 int def_sym
; /* default symbol */
69 } *cur_switch
; /* current switch */
71 /* ------------------------------------------------------------------------- */
72 static void gen_cast(CType
*type
);
73 static inline CType
*pointed_type(CType
*type
);
74 static int is_compatible_types(CType
*type1
, CType
*type2
);
75 static int parse_btype(CType
*type
, AttributeDef
*ad
);
76 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
);
77 static void parse_expr_type(CType
*type
);
78 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
, int first
, int size_only
);
79 static void block(int *bsym
, int *csym
, int is_expr
);
80 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
, int has_init
, int v
, int scope
);
81 static int decl0(int l
, int is_for_loop_init
);
82 static void expr_eq(void);
83 static void expr_lor_const(void);
84 static void unary_type(CType
*type
);
85 static void vla_runtime_type_size(CType
*type
, int *a
);
86 static void vla_sp_restore(void);
87 static void vla_sp_restore_root(void);
88 static int is_compatible_parameter_types(CType
*type1
, CType
*type2
);
89 static void expr_type(CType
*type
);
90 static inline int64_t expr_const64(void);
91 ST_FUNC
void vpush64(int ty
, unsigned long long v
);
92 ST_FUNC
void vpush(CType
*type
);
93 ST_FUNC
int gvtst(int inv
, int t
);
94 ST_FUNC
int is_btype_size(int bt
);
95 static void gen_inline_functions(TCCState
*s
);
97 ST_INLN
int is_float(int t
)
101 return bt
== VT_LDOUBLE
|| bt
== VT_DOUBLE
|| bt
== VT_FLOAT
|| bt
== VT_QFLOAT
;
104 /* we use our own 'finite' function to avoid potential problems with
105 non standard math libs */
106 /* XXX: endianness dependent */
107 ST_FUNC
int ieee_finite(double d
)
110 memcpy(p
, &d
, sizeof(double));
111 return ((unsigned)((p
[1] | 0x800fffff) + 1)) >> 31;
114 ST_FUNC
void test_lvalue(void)
116 if (!(vtop
->r
& VT_LVAL
))
120 ST_FUNC
void check_vstack(void)
123 tcc_error("internal compiler error: vstack leak (%d)", vtop
- pvtop
);
126 /* ------------------------------------------------------------------------- */
127 /* vstack debugging aid */
130 void pv (const char *lbl
, int a
, int b
)
133 for (i
= a
; i
< a
+ b
; ++i
) {
134 SValue
*p
= &vtop
[-i
];
135 printf("%s vtop[-%d] : type.t:%04x r:%04x r2:%04x c.i:%d\n",
136 lbl
, i
, p
->type
.t
, p
->r
, p
->r2
, (int)p
->c
.i
);
141 /* ------------------------------------------------------------------------- */
142 ST_FUNC
void tccgen_start(TCCState
*s1
)
144 cur_text_section
= NULL
;
146 anon_sym
= SYM_FIRST_ANOM
;
150 /* define some often used types */
152 char_pointer_type
.t
= VT_BYTE
;
153 mk_pointer(&char_pointer_type
);
155 size_type
.t
= VT_INT
;
157 size_type
.t
= VT_LLONG
;
159 func_old_type
.t
= VT_FUNC
;
160 func_old_type
.ref
= sym_push(SYM_FIELD
, &int_type
, FUNC_CDECL
, FUNC_OLD
);
165 /* file info: full path + filename */
166 section_sym
= put_elf_sym(symtab_section
, 0, 0,
167 ELFW(ST_INFO
)(STB_LOCAL
, STT_SECTION
), 0,
168 text_section
->sh_num
, NULL
);
169 getcwd(buf
, sizeof(buf
));
171 normalize_slashes(buf
);
173 pstrcat(buf
, sizeof(buf
), "/");
174 put_stabs_r(buf
, N_SO
, 0, 0,
175 text_section
->data_offset
, text_section
, section_sym
);
176 put_stabs_r(file
->filename
, N_SO
, 0, 0,
177 text_section
->data_offset
, text_section
, section_sym
);
179 /* an elf symbol of type STT_FILE must be put so that STB_LOCAL
180 symbols can be safely used */
181 put_elf_sym(symtab_section
, 0, 0,
182 ELFW(ST_INFO
)(STB_LOCAL
, STT_FILE
), 0,
183 SHN_ABS
, file
->filename
);
185 #ifdef TCC_TARGET_ARM
190 ST_FUNC
void tccgen_end(TCCState
*s1
)
192 gen_inline_functions(s1
);
194 /* end of translation unit info */
196 put_stabs_r(NULL
, N_SO
, 0, 0,
197 text_section
->data_offset
, text_section
, section_sym
);
201 /* ------------------------------------------------------------------------- */
202 /* update sym->c so that it points to an external symbol in section
203 'section' with value 'value' */
205 ST_FUNC
void put_extern_sym2(Sym
*sym
, Section
*section
,
206 addr_t value
, unsigned long size
,
207 int can_add_underscore
)
209 int sym_type
, sym_bind
, sh_num
, info
, other
;
214 #ifdef CONFIG_TCC_BCHECK
220 else if (section
== SECTION_ABS
)
223 sh_num
= section
->sh_num
;
225 if ((sym
->type
.t
& VT_BTYPE
) == VT_FUNC
) {
227 } else if ((sym
->type
.t
& VT_BTYPE
) == VT_VOID
) {
228 sym_type
= STT_NOTYPE
;
230 sym_type
= STT_OBJECT
;
233 if (sym
->type
.t
& VT_STATIC
)
234 sym_bind
= STB_LOCAL
;
236 if (sym
->type
.t
& VT_WEAK
)
239 sym_bind
= STB_GLOBAL
;
243 name
= get_tok_str(sym
->v
, NULL
);
244 #ifdef CONFIG_TCC_BCHECK
245 if (tcc_state
->do_bounds_check
) {
246 /* XXX: avoid doing that for statics ? */
247 /* if bound checking is activated, we change some function
248 names by adding the "__bound" prefix */
251 /* XXX: we rely only on malloc hooks */
264 strcpy(buf
, "__bound_");
274 if (sym
->type
.t
& VT_EXPORT
)
275 other
|= ST_PE_EXPORT
;
276 if (sym_type
== STT_FUNC
&& sym
->type
.ref
) {
277 Sym
*ref
= sym
->type
.ref
;
278 if (ref
->a
.func_export
)
279 other
|= ST_PE_EXPORT
;
280 if (ref
->a
.func_call
== FUNC_STDCALL
&& can_add_underscore
) {
281 sprintf(buf1
, "_%s@%d", name
, ref
->a
.func_args
* PTR_SIZE
);
283 other
|= ST_PE_STDCALL
;
284 can_add_underscore
= 0;
287 if (find_elf_sym(tcc_state
->dynsymtab_section
, name
))
288 other
|= ST_PE_IMPORT
;
289 if (sym
->type
.t
& VT_IMPORT
)
290 other
|= ST_PE_IMPORT
;
293 if (! (sym
->type
.t
& VT_STATIC
))
294 other
= (sym
->type
.t
& VT_VIS_MASK
) >> VT_VIS_SHIFT
;
296 if (tcc_state
->leading_underscore
&& can_add_underscore
) {
298 pstrcpy(buf1
+ 1, sizeof(buf1
) - 1, name
);
301 if (sym
->asm_label
) {
302 name
= get_tok_str(sym
->asm_label
, NULL
);
304 info
= ELFW(ST_INFO
)(sym_bind
, sym_type
);
305 sym
->c
= set_elf_sym(symtab_section
, value
, size
, info
, other
, sh_num
, name
);
307 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
308 esym
->st_value
= value
;
309 esym
->st_size
= size
;
310 esym
->st_shndx
= sh_num
;
314 ST_FUNC
void put_extern_sym(Sym
*sym
, Section
*section
,
315 addr_t value
, unsigned long size
)
317 put_extern_sym2(sym
, section
, value
, size
, 1);
320 /* add a new relocation entry to symbol 'sym' in section 's' */
321 ST_FUNC
void greloca(Section
*s
, Sym
*sym
, unsigned long offset
, int type
,
327 put_extern_sym(sym
, NULL
, 0, 0);
330 /* now we can add ELF relocation info */
331 put_elf_reloca(symtab_section
, s
, offset
, type
, c
, addend
);
334 ST_FUNC
void greloc(Section
*s
, Sym
*sym
, unsigned long offset
, int type
)
336 greloca(s
, sym
, offset
, type
, 0);
339 /* ------------------------------------------------------------------------- */
340 /* symbol allocator */
341 static Sym
*__sym_malloc(void)
343 Sym
*sym_pool
, *sym
, *last_sym
;
346 sym_pool
= tcc_malloc(SYM_POOL_NB
* sizeof(Sym
));
347 dynarray_add(&sym_pools
, &nb_sym_pools
, sym_pool
);
349 last_sym
= sym_free_first
;
351 for(i
= 0; i
< SYM_POOL_NB
; i
++) {
352 sym
->next
= last_sym
;
356 sym_free_first
= last_sym
;
360 static inline Sym
*sym_malloc(void)
364 sym
= sym_free_first
;
366 sym
= __sym_malloc();
367 sym_free_first
= sym
->next
;
370 sym
= tcc_malloc(sizeof(Sym
));
375 ST_INLN
void sym_free(Sym
*sym
)
378 sym
->next
= sym_free_first
;
379 sym_free_first
= sym
;
385 /* push, without hashing */
386 ST_FUNC Sym
*sym_push2(Sym
**ps
, int v
, int t
, long c
)
406 /* find a symbol and return its associated structure. 's' is the top
407 of the symbol stack */
408 ST_FUNC Sym
*sym_find2(Sym
*s
, int v
)
420 /* structure lookup */
421 ST_INLN Sym
*struct_find(int v
)
424 if ((unsigned)v
>= (unsigned)(tok_ident
- TOK_IDENT
))
426 return table_ident
[v
]->sym_struct
;
429 /* find an identifier */
430 ST_INLN Sym
*sym_find(int v
)
433 if ((unsigned)v
>= (unsigned)(tok_ident
- TOK_IDENT
))
435 return table_ident
[v
]->sym_identifier
;
438 /* push a given symbol on the symbol stack */
439 ST_FUNC Sym
*sym_push(int v
, CType
*type
, int r
, long c
)
448 s
= sym_push2(ps
, v
, type
->t
, c
);
449 s
->type
.ref
= type
->ref
;
451 /* don't record fields or anonymous symbols */
453 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
454 /* record symbol in token array */
455 ts
= table_ident
[(v
& ~SYM_STRUCT
) - TOK_IDENT
];
457 ps
= &ts
->sym_struct
;
459 ps
= &ts
->sym_identifier
;
462 s
->scope
= local_scope
;
463 if (s
->prev_tok
&& s
->prev_tok
->scope
== s
->scope
)
464 tcc_error("redeclaration of '%s'",
465 get_tok_str(v
& ~SYM_STRUCT
, NULL
));
470 /* push a global identifier */
471 ST_FUNC Sym
*global_identifier_push(int v
, int t
, long c
)
474 s
= sym_push2(&global_stack
, v
, t
, c
);
475 /* don't record anonymous symbol */
476 if (v
< SYM_FIRST_ANOM
) {
477 ps
= &table_ident
[v
- TOK_IDENT
]->sym_identifier
;
478 /* modify the top most local identifier, so that
479 sym_identifier will point to 's' when popped */
481 ps
= &(*ps
)->prev_tok
;
488 /* pop symbols until top reaches 'b'. If KEEP is non-zero don't really
489 pop them yet from the list, but do remove them from the token array. */
490 ST_FUNC
void sym_pop(Sym
**ptop
, Sym
*b
, int keep
)
500 /* remove symbol in token array */
502 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
503 ts
= table_ident
[(v
& ~SYM_STRUCT
) - TOK_IDENT
];
505 ps
= &ts
->sym_struct
;
507 ps
= &ts
->sym_identifier
;
518 static void weaken_symbol(Sym
*sym
)
520 sym
->type
.t
|= VT_WEAK
;
525 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
526 esym_type
= ELFW(ST_TYPE
)(esym
->st_info
);
527 esym
->st_info
= ELFW(ST_INFO
)(STB_WEAK
, esym_type
);
531 static void apply_visibility(Sym
*sym
, CType
*type
)
533 int vis
= sym
->type
.t
& VT_VIS_MASK
;
534 int vis2
= type
->t
& VT_VIS_MASK
;
535 if (vis
== (STV_DEFAULT
<< VT_VIS_SHIFT
))
537 else if (vis2
== (STV_DEFAULT
<< VT_VIS_SHIFT
))
540 vis
= (vis
< vis2
) ? vis
: vis2
;
541 sym
->type
.t
&= ~VT_VIS_MASK
;
547 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
548 vis
>>= VT_VIS_SHIFT
;
549 esym
->st_other
= (esym
->st_other
& ~ELFW(ST_VISIBILITY
)(-1)) | vis
;
553 /* ------------------------------------------------------------------------- */
555 ST_FUNC
void swap(int *p
, int *q
)
563 static void vsetc(CType
*type
, int r
, CValue
*vc
)
567 if (vtop
>= vstack
+ (VSTACK_SIZE
- 1))
568 tcc_error("memory full (vstack)");
569 /* cannot let cpu flags if other instruction are generated. Also
570 avoid leaving VT_JMP anywhere except on the top of the stack
571 because it would complicate the code generator. */
572 if (vtop
>= vstack
) {
573 v
= vtop
->r
& VT_VALMASK
;
574 if (v
== VT_CMP
|| (v
& ~1) == VT_JMP
)
585 /* push constant of type "type" with useless value */
586 ST_FUNC
void vpush(CType
*type
)
589 vsetc(type
, VT_CONST
, &cval
);
592 /* push integer constant */
593 ST_FUNC
void vpushi(int v
)
597 vsetc(&int_type
, VT_CONST
, &cval
);
600 /* push a pointer sized constant */
601 static void vpushs(addr_t v
)
605 vsetc(&size_type
, VT_CONST
, &cval
);
608 /* push arbitrary 64bit constant */
609 ST_FUNC
void vpush64(int ty
, unsigned long long v
)
616 vsetc(&ctype
, VT_CONST
, &cval
);
619 /* push long long constant */
620 static inline void vpushll(long long v
)
622 vpush64(VT_LLONG
, v
);
625 /* push a symbol value of TYPE */
626 static inline void vpushsym(CType
*type
, Sym
*sym
)
630 vsetc(type
, VT_CONST
| VT_SYM
, &cval
);
634 /* Return a static symbol pointing to a section */
635 ST_FUNC Sym
*get_sym_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
641 sym
= global_identifier_push(v
, type
->t
| VT_STATIC
, 0);
642 sym
->type
.ref
= type
->ref
;
643 sym
->r
= VT_CONST
| VT_SYM
;
644 put_extern_sym(sym
, sec
, offset
, size
);
648 /* push a reference to a section offset by adding a dummy symbol */
649 static void vpush_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
651 vpushsym(type
, get_sym_ref(type
, sec
, offset
, size
));
654 /* define a new external reference to a symbol 'v' of type 'u' */
655 ST_FUNC Sym
*external_global_sym(int v
, CType
*type
, int r
)
661 /* push forward reference */
662 s
= global_identifier_push(v
, type
->t
| VT_EXTERN
, 0);
663 s
->type
.ref
= type
->ref
;
664 s
->r
= r
| VT_CONST
| VT_SYM
;
669 /* define a new external reference to a symbol 'v' */
670 static Sym
*external_sym(int v
, CType
*type
, int r
)
676 /* push forward reference */
677 s
= sym_push(v
, type
, r
| VT_CONST
| VT_SYM
, 0);
678 s
->type
.t
|= VT_EXTERN
;
679 } else if (s
->type
.ref
== func_old_type
.ref
) {
680 s
->type
.ref
= type
->ref
;
681 s
->r
= r
| VT_CONST
| VT_SYM
;
682 s
->type
.t
|= VT_EXTERN
;
683 } else if (!is_compatible_types(&s
->type
, type
)) {
684 tcc_error("incompatible types for redefinition of '%s'",
685 get_tok_str(v
, NULL
));
687 /* Merge some storage attributes. */
688 if (type
->t
& VT_WEAK
)
691 if (type
->t
& VT_VIS_MASK
)
692 apply_visibility(s
, type
);
697 /* push a reference to global symbol v */
698 ST_FUNC
void vpush_global_sym(CType
*type
, int v
)
700 vpushsym(type
, external_global_sym(v
, type
, 0));
703 ST_FUNC
void vset(CType
*type
, int r
, long v
)
708 vsetc(type
, r
, &cval
);
711 static void vseti(int r
, int v
)
719 ST_FUNC
void vswap(void)
722 /* cannot let cpu flags if other instruction are generated. Also
723 avoid leaving VT_JMP anywhere except on the top of the stack
724 because it would complicate the code generator. */
725 if (vtop
>= vstack
) {
726 int v
= vtop
->r
& VT_VALMASK
;
727 if (v
== VT_CMP
|| (v
& ~1) == VT_JMP
)
734 /* XXX: +2% overall speed possible with optimized memswap
736 * memswap(&vtop[0], &vtop[1], sizeof *vtop);
740 ST_FUNC
void vpushv(SValue
*v
)
742 if (vtop
>= vstack
+ (VSTACK_SIZE
- 1))
743 tcc_error("memory full (vstack)");
748 static void vdup(void)
753 /* save registers up to (vtop - n) stack entry */
754 ST_FUNC
void save_regs(int n
)
757 for(p
= vstack
, p1
= vtop
- n
; p
<= p1
; p
++)
761 /* save r to the memory stack, and mark it as being free */
762 ST_FUNC
void save_reg(int r
)
764 save_reg_upstack(r
, 0);
767 /* save r to the memory stack, and mark it as being free,
768 if seen up to (vtop - n) stack entry */
769 ST_FUNC
void save_reg_upstack(int r
, int n
)
771 int l
, saved
, size
, align
;
775 if ((r
&= VT_VALMASK
) >= VT_CONST
)
778 /* modify all stack values */
781 for(p
= vstack
, p1
= vtop
- n
; p
<= p1
; p
++) {
782 if ((p
->r
& VT_VALMASK
) == r
||
783 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& (p
->r2
& VT_VALMASK
) == r
)) {
784 /* must save value on stack if not already done */
786 /* NOTE: must reload 'r' because r might be equal to r2 */
787 r
= p
->r
& VT_VALMASK
;
788 /* store register in the stack */
790 if ((p
->r
& VT_LVAL
) ||
791 (!is_float(type
->t
) && (type
->t
& VT_BTYPE
) != VT_LLONG
))
792 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
793 type
= &char_pointer_type
;
797 size
= type_size(type
, &align
);
798 loc
= (loc
- size
) & -align
;
800 sv
.r
= VT_LOCAL
| VT_LVAL
;
803 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
804 /* x86 specific: need to pop fp register ST0 if saved */
806 o(0xd8dd); /* fstp %st(0) */
809 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
810 /* special long long case */
811 if ((type
->t
& VT_BTYPE
) == VT_LLONG
) {
819 /* mark that stack entry as being saved on the stack */
820 if (p
->r
& VT_LVAL
) {
821 /* also clear the bounded flag because the
822 relocation address of the function was stored in
824 p
->r
= (p
->r
& ~(VT_VALMASK
| VT_BOUNDED
)) | VT_LLOCAL
;
826 p
->r
= lvalue_type(p
->type
.t
) | VT_LOCAL
;
834 #ifdef TCC_TARGET_ARM
835 /* find a register of class 'rc2' with at most one reference on stack.
836 * If none, call get_reg(rc) */
837 ST_FUNC
int get_reg_ex(int rc
, int rc2
)
842 for(r
=0;r
<NB_REGS
;r
++) {
843 if (reg_classes
[r
] & rc2
) {
846 for(p
= vstack
; p
<= vtop
; p
++) {
847 if ((p
->r
& VT_VALMASK
) == r
||
848 (p
->r2
& VT_VALMASK
) == r
)
859 /* find a free register of class 'rc'. If none, save one register */
860 ST_FUNC
int get_reg(int rc
)
865 /* find a free register */
866 for(r
=0;r
<NB_REGS
;r
++) {
867 if (reg_classes
[r
] & rc
) {
868 for(p
=vstack
;p
<=vtop
;p
++) {
869 if ((p
->r
& VT_VALMASK
) == r
||
870 (p
->r2
& VT_VALMASK
) == r
)
878 /* no register left : free the first one on the stack (VERY
879 IMPORTANT to start from the bottom to ensure that we don't
880 spill registers used in gen_opi()) */
881 for(p
=vstack
;p
<=vtop
;p
++) {
882 /* look at second register (if long long) */
883 r
= p
->r2
& VT_VALMASK
;
884 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
))
886 r
= p
->r
& VT_VALMASK
;
887 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
)) {
893 /* Should never comes here */
897 /* move register 's' (of type 't') to 'r', and flush previous value of r to memory
899 static void move_reg(int r
, int s
, int t
)
913 /* get address of vtop (vtop MUST BE an lvalue) */
914 ST_FUNC
void gaddrof(void)
916 if (vtop
->r
& VT_REF
&& !nocode_wanted
)
919 /* tricky: if saved lvalue, then we can go back to lvalue */
920 if ((vtop
->r
& VT_VALMASK
) == VT_LLOCAL
)
921 vtop
->r
= (vtop
->r
& ~(VT_VALMASK
| VT_LVAL_TYPE
)) | VT_LOCAL
| VT_LVAL
;
926 #ifdef CONFIG_TCC_BCHECK
927 /* generate lvalue bound code */
928 static void gbound(void)
933 vtop
->r
&= ~VT_MUSTBOUND
;
934 /* if lvalue, then use checking code before dereferencing */
935 if (vtop
->r
& VT_LVAL
) {
936 /* if not VT_BOUNDED value, then make one */
937 if (!(vtop
->r
& VT_BOUNDED
)) {
938 lval_type
= vtop
->r
& (VT_LVAL_TYPE
| VT_LVAL
);
939 /* must save type because we must set it to int to get pointer */
941 vtop
->type
.t
= VT_PTR
;
944 gen_bounded_ptr_add();
945 vtop
->r
|= lval_type
;
948 /* then check for dereferencing */
949 gen_bounded_ptr_deref();
954 /* store vtop a register belonging to class 'rc'. lvalues are
955 converted to values. Cannot be used if cannot be converted to
956 register value (such as structures). */
957 ST_FUNC
int gv(int rc
)
959 int r
, bit_pos
, bit_size
, size
, align
, i
;
962 /* NOTE: get_reg can modify vstack[] */
963 if (vtop
->type
.t
& VT_BITFIELD
) {
966 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
967 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
968 /* remove bit field info to avoid loops */
969 vtop
->type
.t
&= ~VT_BITFIELD
& ((1 << VT_STRUCT_SHIFT
) - 1);
970 /* cast to int to propagate signedness in following ops */
971 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
976 if((vtop
->type
.t
& VT_UNSIGNED
) ||
977 (vtop
->type
.t
& VT_BTYPE
) == VT_BOOL
)
978 type
.t
|= VT_UNSIGNED
;
980 /* generate shifts */
981 vpushi(bits
- (bit_pos
+ bit_size
));
983 vpushi(bits
- bit_size
);
984 /* NOTE: transformed to SHR if unsigned */
988 if (is_float(vtop
->type
.t
) &&
989 (vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
992 unsigned long offset
;
993 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
997 /* XXX: unify with initializers handling ? */
998 /* CPUs usually cannot use float constants, so we store them
999 generically in data segment */
1000 size
= type_size(&vtop
->type
, &align
);
1001 offset
= (data_section
->data_offset
+ align
- 1) & -align
;
1002 data_section
->data_offset
= offset
;
1003 /* XXX: not portable yet */
1004 #if defined(__i386__) || defined(__x86_64__)
1005 /* Zero pad x87 tenbyte long doubles */
1006 if (size
== LDOUBLE_SIZE
) {
1007 vtop
->c
.tab
[2] &= 0xffff;
1008 #if LDOUBLE_SIZE == 16
1013 ptr
= section_ptr_add(data_section
, size
);
1015 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
1019 ptr
[i
] = vtop
->c
.tab
[size
-1-i
];
1023 ptr
[i
] = vtop
->c
.tab
[i
];
1024 sym
= get_sym_ref(&vtop
->type
, data_section
, offset
, size
<< 2);
1025 vtop
->r
|= VT_LVAL
| VT_SYM
;
1029 #ifdef CONFIG_TCC_BCHECK
1030 if (vtop
->r
& VT_MUSTBOUND
)
1034 r
= vtop
->r
& VT_VALMASK
;
1035 rc2
= (rc
& RC_FLOAT
) ? RC_FLOAT
: RC_INT
;
1036 #ifndef TCC_TARGET_ARM64
1039 #ifdef TCC_TARGET_X86_64
1040 else if (rc
== RC_FRET
)
1045 /* need to reload if:
1047 - lvalue (need to dereference pointer)
1048 - already a register, but not in the right class */
1050 || (vtop
->r
& VT_LVAL
)
1051 || !(reg_classes
[r
] & rc
)
1052 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1053 || ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
&& !(reg_classes
[vtop
->r2
] & rc2
))
1054 || ((vtop
->type
.t
& VT_BTYPE
) == VT_QFLOAT
&& !(reg_classes
[vtop
->r2
] & rc2
))
1056 || ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
&& !(reg_classes
[vtop
->r2
] & rc2
))
1061 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1062 if (((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) || ((vtop
->type
.t
& VT_BTYPE
) == VT_QFLOAT
)) {
1063 int addr_type
= VT_LLONG
, load_size
= 8, load_type
= ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) ? VT_LLONG
: VT_DOUBLE
;
1065 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
1066 int addr_type
= VT_INT
, load_size
= 4, load_type
= VT_INT
;
1067 unsigned long long ll
;
1069 int r2
, original_type
;
1070 original_type
= vtop
->type
.t
;
1071 /* two register type load : expand to two words
1073 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
1074 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
1077 vtop
->c
.i
= ll
; /* first word */
1079 vtop
->r
= r
; /* save register value */
1080 vpushi(ll
>> 32); /* second word */
1083 if (vtop
->r
& VT_LVAL
) {
1084 /* We do not want to modifier the long long
1085 pointer here, so the safest (and less
1086 efficient) is to save all the other registers
1087 in the stack. XXX: totally inefficient. */
1091 /* lvalue_save: save only if used further down the stack */
1092 save_reg_upstack(vtop
->r
, 1);
1094 /* load from memory */
1095 vtop
->type
.t
= load_type
;
1098 vtop
[-1].r
= r
; /* save register value */
1099 /* increment pointer to get second word */
1100 vtop
->type
.t
= addr_type
;
1105 vtop
->type
.t
= load_type
;
1107 /* move registers */
1110 vtop
[-1].r
= r
; /* save register value */
1111 vtop
->r
= vtop
[-1].r2
;
1113 /* Allocate second register. Here we rely on the fact that
1114 get_reg() tries first to free r2 of an SValue. */
1118 /* write second register */
1120 vtop
->type
.t
= original_type
;
1121 } else if ((vtop
->r
& VT_LVAL
) && !is_float(vtop
->type
.t
)) {
1123 /* lvalue of scalar type : need to use lvalue type
1124 because of possible cast */
1127 /* compute memory access type */
1128 if (vtop
->r
& VT_REF
)
1129 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1134 else if (vtop
->r
& VT_LVAL_BYTE
)
1136 else if (vtop
->r
& VT_LVAL_SHORT
)
1138 if (vtop
->r
& VT_LVAL_UNSIGNED
)
1142 /* restore wanted type */
1145 /* one register type load */
1150 #ifdef TCC_TARGET_C67
1151 /* uses register pairs for doubles */
1152 if ((vtop
->type
.t
& VT_BTYPE
) == VT_DOUBLE
)
1159 /* generate vtop[-1] and vtop[0] in resp. classes rc1 and rc2 */
1160 ST_FUNC
void gv2(int rc1
, int rc2
)
1164 /* generate more generic register first. But VT_JMP or VT_CMP
1165 values must be generated first in all cases to avoid possible
1167 v
= vtop
[0].r
& VT_VALMASK
;
1168 if (v
!= VT_CMP
&& (v
& ~1) != VT_JMP
&& rc1
<= rc2
) {
1173 /* test if reload is needed for first register */
1174 if ((vtop
[-1].r
& VT_VALMASK
) >= VT_CONST
) {
1184 /* test if reload is needed for first register */
1185 if ((vtop
[0].r
& VT_VALMASK
) >= VT_CONST
) {
1191 #ifndef TCC_TARGET_ARM64
1192 /* wrapper around RC_FRET to return a register by type */
1193 static int rc_fret(int t
)
1195 #ifdef TCC_TARGET_X86_64
1196 if (t
== VT_LDOUBLE
) {
1204 /* wrapper around REG_FRET to return a register by type */
1205 static int reg_fret(int t
)
1207 #ifdef TCC_TARGET_X86_64
1208 if (t
== VT_LDOUBLE
) {
1215 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
1216 /* expand 64bit on stack in two ints */
1217 static void lexpand(void)
1220 u
= vtop
->type
.t
& (VT_DEFSIGN
| VT_UNSIGNED
);
1221 v
= vtop
->r
& (VT_VALMASK
| VT_LVAL
);
1222 if (v
== VT_CONST
) {
1225 } else if (v
== (VT_LVAL
|VT_CONST
) || v
== (VT_LVAL
|VT_LOCAL
)) {
1231 vtop
[0].r
= vtop
[-1].r2
;
1232 vtop
[0].r2
= vtop
[-1].r2
= VT_CONST
;
1234 vtop
[0].type
.t
= vtop
[-1].type
.t
= VT_INT
| u
;
1238 #ifdef TCC_TARGET_ARM
1239 /* expand long long on stack */
1240 ST_FUNC
void lexpand_nr(void)
1244 u
= vtop
->type
.t
& (VT_DEFSIGN
| VT_UNSIGNED
);
1246 vtop
->r2
= VT_CONST
;
1247 vtop
->type
.t
= VT_INT
| u
;
1248 v
=vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
);
1249 if (v
== VT_CONST
) {
1250 vtop
[-1].c
.i
= vtop
->c
.i
;
1251 vtop
->c
.i
= vtop
->c
.i
>> 32;
1253 } else if (v
== (VT_LVAL
|VT_CONST
) || v
== (VT_LVAL
|VT_LOCAL
)) {
1255 vtop
->r
= vtop
[-1].r
;
1256 } else if (v
> VT_CONST
) {
1260 vtop
->r
= vtop
[-1].r2
;
1261 vtop
[-1].r2
= VT_CONST
;
1262 vtop
[-1].type
.t
= VT_INT
| u
;
1266 #if !defined(TCC_TARGET_X86_64) && !defined(TCC_TARGET_ARM64)
1267 /* build a long long from two ints */
1268 static void lbuild(int t
)
1270 gv2(RC_INT
, RC_INT
);
1271 vtop
[-1].r2
= vtop
[0].r
;
1272 vtop
[-1].type
.t
= t
;
1277 /* rotate n first stack elements to the bottom
1278 I1 ... In -> I2 ... In I1 [top is right]
1280 ST_FUNC
void vrotb(int n
)
1286 for(i
=-n
+1;i
!=0;i
++)
1287 vtop
[i
] = vtop
[i
+1];
1291 /* rotate the n elements before entry e towards the top
1292 I1 ... In ... -> In I1 ... I(n-1) ... [top is right]
1294 ST_FUNC
void vrote(SValue
*e
, int n
)
1300 for(i
= 0;i
< n
- 1; i
++)
1305 /* rotate n first stack elements to the top
1306 I1 ... In -> In I1 ... I(n-1) [top is right]
1308 ST_FUNC
void vrott(int n
)
1313 /* pop stack value */
1314 ST_FUNC
void vpop(void)
1317 v
= vtop
->r
& VT_VALMASK
;
1318 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
1319 /* for x86, we need to pop the FP stack */
1320 if (v
== TREG_ST0
&& !nocode_wanted
) {
1321 o(0xd8dd); /* fstp %st(0) */
1324 if (v
== VT_JMP
|| v
== VT_JMPI
) {
1325 /* need to put correct jump if && or || without test */
1331 /* convert stack entry to register and duplicate its value in another
1333 static void gv_dup(void)
1339 #if !defined(TCC_TARGET_X86_64) && !defined(TCC_TARGET_ARM64)
1340 if ((t
& VT_BTYPE
) == VT_LLONG
) {
1347 /* stack: H L L1 H1 */
1357 /* duplicate value */
1362 #ifdef TCC_TARGET_X86_64
1363 if ((t
& VT_BTYPE
) == VT_LDOUBLE
) {
1373 load(r1
, &sv
); /* move r to r1 */
1375 /* duplicates value */
1381 /* Generate value test
1383 * Generate a test for any value (jump, comparison and integers) */
1384 ST_FUNC
int gvtst(int inv
, int t
)
1386 int v
= vtop
->r
& VT_VALMASK
;
1387 if (v
!= VT_CMP
&& v
!= VT_JMP
&& v
!= VT_JMPI
) {
1391 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
1392 /* constant jmp optimization */
1393 if ((vtop
->c
.i
!= 0) != inv
)
1398 return gtst(inv
, t
);
1401 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
1402 /* generate CPU independent (unsigned) long long operations */
1403 static void gen_opl(int op
)
1405 int t
, a
, b
, op1
, c
, i
;
1407 unsigned short reg_iret
= REG_IRET
;
1408 unsigned short reg_lret
= REG_LRET
;
1414 func
= TOK___divdi3
;
1417 func
= TOK___udivdi3
;
1420 func
= TOK___moddi3
;
1423 func
= TOK___umoddi3
;
1430 /* call generic long long function */
1431 vpush_global_sym(&func_old_type
, func
);
1436 vtop
->r2
= reg_lret
;
1444 //pv("gen_opl A",0,2);
1450 /* stack: L1 H1 L2 H2 */
1455 vtop
[-2] = vtop
[-3];
1458 /* stack: H1 H2 L1 L2 */
1459 //pv("gen_opl B",0,4);
1465 /* stack: H1 H2 L1 L2 ML MH */
1468 /* stack: ML MH H1 H2 L1 L2 */
1472 /* stack: ML MH H1 L2 H2 L1 */
1477 /* stack: ML MH M1 M2 */
1480 } else if (op
== '+' || op
== '-') {
1481 /* XXX: add non carry method too (for MIPS or alpha) */
1487 /* stack: H1 H2 (L1 op L2) */
1490 gen_op(op1
+ 1); /* TOK_xxxC2 */
1493 /* stack: H1 H2 (L1 op L2) */
1496 /* stack: (L1 op L2) H1 H2 */
1498 /* stack: (L1 op L2) (H1 op H2) */
1506 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
1507 t
= vtop
[-1].type
.t
;
1511 /* stack: L H shift */
1513 /* constant: simpler */
1514 /* NOTE: all comments are for SHL. the other cases are
1515 done by swaping words */
1526 if (op
!= TOK_SAR
) {
1559 /* XXX: should provide a faster fallback on x86 ? */
1562 func
= TOK___ashrdi3
;
1565 func
= TOK___lshrdi3
;
1568 func
= TOK___ashldi3
;
1574 /* compare operations */
1580 /* stack: L1 H1 L2 H2 */
1582 vtop
[-1] = vtop
[-2];
1584 /* stack: L1 L2 H1 H2 */
1587 /* when values are equal, we need to compare low words. since
1588 the jump is inverted, we invert the test too. */
1591 else if (op1
== TOK_GT
)
1593 else if (op1
== TOK_ULT
)
1595 else if (op1
== TOK_UGT
)
1600 if (op1
!= TOK_NE
) {
1604 /* generate non equal test */
1605 /* XXX: NOT PORTABLE yet */
1609 #if defined(TCC_TARGET_I386)
1610 b
= psym(0x850f, 0);
1611 #elif defined(TCC_TARGET_ARM)
1613 o(0x1A000000 | encbranch(ind
, 0, 1));
1614 #elif defined(TCC_TARGET_C67) || defined(TCC_TARGET_ARM64)
1615 tcc_error("not implemented");
1617 #error not supported
1621 /* compare low. Always unsigned */
1625 else if (op1
== TOK_LE
)
1627 else if (op1
== TOK_GT
)
1629 else if (op1
== TOK_GE
)
1640 static uint64_t gen_opic_sdiv(uint64_t a
, uint64_t b
)
1642 uint64_t x
= (a
>> 63 ? -a
: a
) / (b
>> 63 ? -b
: b
);
1643 return (a
^ b
) >> 63 ? -x
: x
;
1646 static int gen_opic_lt(uint64_t a
, uint64_t b
)
1648 return (a
^ (uint64_t)1 << 63) < (b
^ (uint64_t)1 << 63);
1651 /* handle integer constant optimizations and various machine
1653 static void gen_opic(int op
)
1655 SValue
*v1
= vtop
- 1;
1657 int t1
= v1
->type
.t
& VT_BTYPE
;
1658 int t2
= v2
->type
.t
& VT_BTYPE
;
1659 int c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1660 int c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1661 uint64_t l1
= c1
? v1
->c
.i
: 0;
1662 uint64_t l2
= c2
? v2
->c
.i
: 0;
1663 int shm
= (t1
== VT_LLONG
) ? 63 : 31;
1665 if (t1
!= VT_LLONG
&& (PTR_SIZE
!= 8 || t1
!= VT_PTR
))
1666 l1
= ((uint32_t)l1
|
1667 (v1
->type
.t
& VT_UNSIGNED
? 0 : -(l1
& 0x80000000)));
1668 if (t2
!= VT_LLONG
&& (PTR_SIZE
!= 8 || t2
!= VT_PTR
))
1669 l2
= ((uint32_t)l2
|
1670 (v2
->type
.t
& VT_UNSIGNED
? 0 : -(l2
& 0x80000000)));
1674 case '+': l1
+= l2
; break;
1675 case '-': l1
-= l2
; break;
1676 case '&': l1
&= l2
; break;
1677 case '^': l1
^= l2
; break;
1678 case '|': l1
|= l2
; break;
1679 case '*': l1
*= l2
; break;
1686 /* if division by zero, generate explicit division */
1689 tcc_error("division by zero in constant");
1693 default: l1
= gen_opic_sdiv(l1
, l2
); break;
1694 case '%': l1
= l1
- l2
* gen_opic_sdiv(l1
, l2
); break;
1695 case TOK_UDIV
: l1
= l1
/ l2
; break;
1696 case TOK_UMOD
: l1
= l1
% l2
; break;
1699 case TOK_SHL
: l1
<<= (l2
& shm
); break;
1700 case TOK_SHR
: l1
>>= (l2
& shm
); break;
1702 l1
= (l1
>> 63) ? ~(~l1
>> (l2
& shm
)) : l1
>> (l2
& shm
);
1705 case TOK_ULT
: l1
= l1
< l2
; break;
1706 case TOK_UGE
: l1
= l1
>= l2
; break;
1707 case TOK_EQ
: l1
= l1
== l2
; break;
1708 case TOK_NE
: l1
= l1
!= l2
; break;
1709 case TOK_ULE
: l1
= l1
<= l2
; break;
1710 case TOK_UGT
: l1
= l1
> l2
; break;
1711 case TOK_LT
: l1
= gen_opic_lt(l1
, l2
); break;
1712 case TOK_GE
: l1
= !gen_opic_lt(l1
, l2
); break;
1713 case TOK_LE
: l1
= !gen_opic_lt(l2
, l1
); break;
1714 case TOK_GT
: l1
= gen_opic_lt(l2
, l1
); break;
1716 case TOK_LAND
: l1
= l1
&& l2
; break;
1717 case TOK_LOR
: l1
= l1
|| l2
; break;
1721 if (t1
!= VT_LLONG
&& (PTR_SIZE
!= 8 || t1
!= VT_PTR
))
1722 l1
= ((uint32_t)l1
|
1723 (v1
->type
.t
& VT_UNSIGNED
? 0 : -(l1
& 0x80000000)));
1727 /* if commutative ops, put c2 as constant */
1728 if (c1
&& (op
== '+' || op
== '&' || op
== '^' ||
1729 op
== '|' || op
== '*')) {
1731 c2
= c1
; //c = c1, c1 = c2, c2 = c;
1732 l2
= l1
; //l = l1, l1 = l2, l2 = l;
1734 if (!const_wanted
&&
1736 (op
== TOK_SHL
|| op
== TOK_SHR
|| op
== TOK_SAR
)) ||
1737 (l1
== -1 && op
== TOK_SAR
))) {
1738 /* treat (0 << x), (0 >> x) and (-1 >> x) as constant */
1740 } else if (!const_wanted
&&
1741 c2
&& ((l2
== 0 && (op
== '&' || op
== '*')) ||
1742 (l2
== -1 && op
== '|') ||
1743 (l2
== 0xffffffff && t2
!= VT_LLONG
&& op
== '|') ||
1744 (l2
== 1 && (op
== '%' || op
== TOK_UMOD
)))) {
1745 /* treat (x & 0), (x * 0), (x | -1) and (x % 1) as constant */
1750 } else if (c2
&& (((op
== '*' || op
== '/' || op
== TOK_UDIV
||
1753 ((op
== '+' || op
== '-' || op
== '|' || op
== '^' ||
1754 op
== TOK_SHL
|| op
== TOK_SHR
|| op
== TOK_SAR
) &&
1758 /* filter out NOP operations like x*1, x-0, x&-1... */
1760 } else if (c2
&& (op
== '*' || op
== TOK_PDIV
|| op
== TOK_UDIV
)) {
1761 /* try to use shifts instead of muls or divs */
1762 if (l2
> 0 && (l2
& (l2
- 1)) == 0) {
1771 else if (op
== TOK_PDIV
)
1777 } else if (c2
&& (op
== '+' || op
== '-') &&
1778 (((vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
))
1779 || (vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
)) == VT_LOCAL
)) {
1780 /* symbol + constant case */
1784 /* The backends can't always deal with addends to symbols
1785 larger than +-1<<31. Don't construct such. */
1792 if (!nocode_wanted
) {
1793 /* call low level op generator */
1794 if (t1
== VT_LLONG
|| t2
== VT_LLONG
||
1795 (PTR_SIZE
== 8 && (t1
== VT_PTR
|| t2
== VT_PTR
)))
1801 /* Ensure vtop isn't marked VT_CONST in case something
1802 up our callchain is interested in const-ness of the
1803 expression. Also make it a non-LVAL if it was,
1804 so that further code can't accidentally generate
1805 a deref (happen only for buggy uses of e.g.
1806 gv() under nocode_wanted). */
1807 vtop
->r
&= ~(VT_VALMASK
| VT_LVAL
);
1813 /* generate a floating point operation with constant propagation */
1814 static void gen_opif(int op
)
1822 /* currently, we cannot do computations with forward symbols */
1823 c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1824 c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1826 if (v1
->type
.t
== VT_FLOAT
) {
1829 } else if (v1
->type
.t
== VT_DOUBLE
) {
1837 /* NOTE: we only do constant propagation if finite number (not
1838 NaN or infinity) (ANSI spec) */
1839 if (!ieee_finite(f1
) || !ieee_finite(f2
))
1843 case '+': f1
+= f2
; break;
1844 case '-': f1
-= f2
; break;
1845 case '*': f1
*= f2
; break;
1849 tcc_error("division by zero in constant");
1854 /* XXX: also handles tests ? */
1858 /* XXX: overflow test ? */
1859 if (v1
->type
.t
== VT_FLOAT
) {
1861 } else if (v1
->type
.t
== VT_DOUBLE
) {
1869 if (!nocode_wanted
) {
1877 static int pointed_size(CType
*type
)
1880 return type_size(pointed_type(type
), &align
);
1883 static void vla_runtime_pointed_size(CType
*type
)
1886 vla_runtime_type_size(pointed_type(type
), &align
);
1889 static inline int is_null_pointer(SValue
*p
)
1891 if ((p
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
1893 return ((p
->type
.t
& VT_BTYPE
) == VT_INT
&& (uint32_t)p
->c
.i
== 0) ||
1894 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& p
->c
.i
== 0) ||
1895 ((p
->type
.t
& VT_BTYPE
) == VT_PTR
&&
1896 (PTR_SIZE
== 4 ? (uint32_t)p
->c
.i
== 0 : p
->c
.i
== 0));
1899 static inline int is_integer_btype(int bt
)
1901 return (bt
== VT_BYTE
|| bt
== VT_SHORT
||
1902 bt
== VT_INT
|| bt
== VT_LLONG
);
1905 /* check types for comparison or subtraction of pointers */
1906 static void check_comparison_pointer_types(SValue
*p1
, SValue
*p2
, int op
)
1908 CType
*type1
, *type2
, tmp_type1
, tmp_type2
;
1911 /* null pointers are accepted for all comparisons as gcc */
1912 if (is_null_pointer(p1
) || is_null_pointer(p2
))
1916 bt1
= type1
->t
& VT_BTYPE
;
1917 bt2
= type2
->t
& VT_BTYPE
;
1918 /* accept comparison between pointer and integer with a warning */
1919 if ((is_integer_btype(bt1
) || is_integer_btype(bt2
)) && op
!= '-') {
1920 if (op
!= TOK_LOR
&& op
!= TOK_LAND
)
1921 tcc_warning("comparison between pointer and integer");
1925 /* both must be pointers or implicit function pointers */
1926 if (bt1
== VT_PTR
) {
1927 type1
= pointed_type(type1
);
1928 } else if (bt1
!= VT_FUNC
)
1929 goto invalid_operands
;
1931 if (bt2
== VT_PTR
) {
1932 type2
= pointed_type(type2
);
1933 } else if (bt2
!= VT_FUNC
) {
1935 tcc_error("invalid operands to binary %s", get_tok_str(op
, NULL
));
1937 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
1938 (type2
->t
& VT_BTYPE
) == VT_VOID
)
1942 tmp_type1
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1943 tmp_type2
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1944 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
1945 /* gcc-like error if '-' is used */
1947 goto invalid_operands
;
1949 tcc_warning("comparison of distinct pointer types lacks a cast");
1953 /* generic gen_op: handles types problems */
1954 ST_FUNC
void gen_op(int op
)
1956 int u
, t1
, t2
, bt1
, bt2
, t
;
1960 t1
= vtop
[-1].type
.t
;
1961 t2
= vtop
[0].type
.t
;
1962 bt1
= t1
& VT_BTYPE
;
1963 bt2
= t2
& VT_BTYPE
;
1965 if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
1966 tcc_error("operation on a struct");
1967 } else if (bt1
== VT_FUNC
|| bt2
== VT_FUNC
) {
1968 if (bt2
== VT_FUNC
) {
1969 mk_pointer(&vtop
->type
);
1972 if (bt1
== VT_FUNC
) {
1974 mk_pointer(&vtop
->type
);
1979 } else if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
1980 /* at least one operand is a pointer */
1981 /* relationnal op: must be both pointers */
1982 if (op
>= TOK_ULT
&& op
<= TOK_LOR
) {
1983 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1984 /* pointers are handled are unsigned */
1985 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1986 t
= VT_LLONG
| VT_UNSIGNED
;
1988 t
= VT_INT
| VT_UNSIGNED
;
1992 /* if both pointers, then it must be the '-' op */
1993 if (bt1
== VT_PTR
&& bt2
== VT_PTR
) {
1995 tcc_error("cannot use pointers here");
1996 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1997 /* XXX: check that types are compatible */
1998 if (vtop
[-1].type
.t
& VT_VLA
) {
1999 vla_runtime_pointed_size(&vtop
[-1].type
);
2001 vpushi(pointed_size(&vtop
[-1].type
));
2005 /* set to integer type */
2006 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2007 vtop
->type
.t
= VT_LLONG
;
2009 vtop
->type
.t
= VT_INT
;
2014 /* exactly one pointer : must be '+' or '-'. */
2015 if (op
!= '-' && op
!= '+')
2016 tcc_error("cannot use pointers here");
2017 /* Put pointer as first operand */
2018 if (bt2
== VT_PTR
) {
2023 if ((vtop
[0].type
.t
& VT_BTYPE
) == VT_LLONG
)
2024 /* XXX: truncate here because gen_opl can't handle ptr + long long */
2025 gen_cast(&int_type
);
2027 type1
= vtop
[-1].type
;
2028 type1
.t
&= ~VT_ARRAY
;
2029 if (vtop
[-1].type
.t
& VT_VLA
)
2030 vla_runtime_pointed_size(&vtop
[-1].type
);
2032 u
= pointed_size(&vtop
[-1].type
);
2034 tcc_error("unknown array element size");
2035 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2038 /* XXX: cast to int ? (long long case) */
2044 /* #ifdef CONFIG_TCC_BCHECK
2045 The main reason to removing this code:
2052 fprintf(stderr, "v+i-j = %p\n", v+i-j);
2053 fprintf(stderr, "v+(i-j) = %p\n", v+(i-j));
2055 When this code is on. then the output looks like
2057 v+(i-j) = 0xbff84000
2059 /* if evaluating constant expression, no code should be
2060 generated, so no bound check */
2061 if (tcc_state
->do_bounds_check
&& !const_wanted
) {
2062 /* if bounded pointers, we generate a special code to
2069 gen_bounded_ptr_add();
2075 /* put again type if gen_opic() swaped operands */
2078 } else if (is_float(bt1
) || is_float(bt2
)) {
2079 /* compute bigger type and do implicit casts */
2080 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
2082 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
2087 /* floats can only be used for a few operations */
2088 if (op
!= '+' && op
!= '-' && op
!= '*' && op
!= '/' &&
2089 (op
< TOK_ULT
|| op
> TOK_GT
))
2090 tcc_error("invalid operands for binary operation");
2092 } else if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
) {
2093 t
= bt1
== VT_LLONG
? VT_LLONG
: VT_INT
;
2094 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (t
| VT_UNSIGNED
))
2097 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
2098 /* cast to biggest op */
2100 /* convert to unsigned if it does not fit in a long long */
2101 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
2102 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
2106 /* integer operations */
2108 /* convert to unsigned if it does not fit in an integer */
2109 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
2110 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
2113 /* XXX: currently, some unsigned operations are explicit, so
2114 we modify them here */
2115 if (t
& VT_UNSIGNED
) {
2122 else if (op
== TOK_LT
)
2124 else if (op
== TOK_GT
)
2126 else if (op
== TOK_LE
)
2128 else if (op
== TOK_GE
)
2135 /* special case for shifts and long long: we keep the shift as
2137 if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
)
2144 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
2145 /* relationnal op: the result is an int */
2146 vtop
->type
.t
= VT_INT
;
2151 // Make sure that we have converted to an rvalue:
2152 if (vtop
->r
& VT_LVAL
&& !nocode_wanted
)
2153 gv(is_float(vtop
->type
.t
& VT_BTYPE
) ? RC_FLOAT
: RC_INT
);
2156 #ifndef TCC_TARGET_ARM
2157 /* generic itof for unsigned long long case */
2158 static void gen_cvt_itof1(int t
)
2160 #ifdef TCC_TARGET_ARM64
2163 if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
2164 (VT_LLONG
| VT_UNSIGNED
)) {
2167 vpush_global_sym(&func_old_type
, TOK___floatundisf
);
2168 #if LDOUBLE_SIZE != 8
2169 else if (t
== VT_LDOUBLE
)
2170 vpush_global_sym(&func_old_type
, TOK___floatundixf
);
2173 vpush_global_sym(&func_old_type
, TOK___floatundidf
);
2177 vtop
->r
= reg_fret(t
);
2185 /* generic ftoi for unsigned long long case */
2186 static void gen_cvt_ftoi1(int t
)
2188 #ifdef TCC_TARGET_ARM64
2193 if (t
== (VT_LLONG
| VT_UNSIGNED
)) {
2194 /* not handled natively */
2195 st
= vtop
->type
.t
& VT_BTYPE
;
2197 vpush_global_sym(&func_old_type
, TOK___fixunssfdi
);
2198 #if LDOUBLE_SIZE != 8
2199 else if (st
== VT_LDOUBLE
)
2200 vpush_global_sym(&func_old_type
, TOK___fixunsxfdi
);
2203 vpush_global_sym(&func_old_type
, TOK___fixunsdfdi
);
2208 vtop
->r2
= REG_LRET
;
2215 /* force char or short cast */
2216 static void force_charshort_cast(int t
)
2220 /* XXX: add optimization if lvalue : just change type and offset */
2225 if (t
& VT_UNSIGNED
) {
2226 vpushi((1 << bits
) - 1);
2229 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
)
2235 /* result must be signed or the SAR is converted to an SHL
2236 This was not the case when "t" was a signed short
2237 and the last value on the stack was an unsigned int */
2238 vtop
->type
.t
&= ~VT_UNSIGNED
;
2244 /* cast 'vtop' to 'type'. Casting to bitfields is forbidden. */
2245 static void gen_cast(CType
*type
)
2247 int sbt
, dbt
, sf
, df
, c
, p
;
2249 /* special delayed cast for char/short */
2250 /* XXX: in some cases (multiple cascaded casts), it may still
2252 if (vtop
->r
& VT_MUSTCAST
) {
2253 vtop
->r
&= ~VT_MUSTCAST
;
2254 force_charshort_cast(vtop
->type
.t
);
2257 /* bitfields first get cast to ints */
2258 if (vtop
->type
.t
& VT_BITFIELD
&& !nocode_wanted
) {
2262 dbt
= type
->t
& (VT_BTYPE
| VT_UNSIGNED
);
2263 sbt
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
2268 c
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
2269 p
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
);
2271 /* constant case: we can do it now */
2272 /* XXX: in ISOC, cannot do it if error in convert */
2273 if (sbt
== VT_FLOAT
)
2274 vtop
->c
.ld
= vtop
->c
.f
;
2275 else if (sbt
== VT_DOUBLE
)
2276 vtop
->c
.ld
= vtop
->c
.d
;
2279 if ((sbt
& VT_BTYPE
) == VT_LLONG
) {
2280 if ((sbt
& VT_UNSIGNED
) || !(vtop
->c
.i
>> 63))
2281 vtop
->c
.ld
= vtop
->c
.i
;
2283 vtop
->c
.ld
= -(long double)-vtop
->c
.i
;
2285 if ((sbt
& VT_UNSIGNED
) || !(vtop
->c
.i
>> 31))
2286 vtop
->c
.ld
= (uint32_t)vtop
->c
.i
;
2288 vtop
->c
.ld
= -(long double)-(uint32_t)vtop
->c
.i
;
2291 if (dbt
== VT_FLOAT
)
2292 vtop
->c
.f
= (float)vtop
->c
.ld
;
2293 else if (dbt
== VT_DOUBLE
)
2294 vtop
->c
.d
= (double)vtop
->c
.ld
;
2295 } else if (sf
&& dbt
== (VT_LLONG
|VT_UNSIGNED
)) {
2296 vtop
->c
.i
= vtop
->c
.ld
;
2297 } else if (sf
&& dbt
== VT_BOOL
) {
2298 vtop
->c
.i
= (vtop
->c
.ld
!= 0);
2301 vtop
->c
.i
= vtop
->c
.ld
;
2302 else if (sbt
== (VT_LLONG
|VT_UNSIGNED
))
2304 else if (sbt
& VT_UNSIGNED
)
2305 vtop
->c
.i
= (uint32_t)vtop
->c
.i
;
2306 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2307 else if (sbt
== VT_PTR
)
2310 else if (sbt
!= VT_LLONG
)
2311 vtop
->c
.i
= ((uint32_t)vtop
->c
.i
|
2312 -(vtop
->c
.i
& 0x80000000));
2314 if (dbt
== (VT_LLONG
|VT_UNSIGNED
))
2316 else if (dbt
== VT_BOOL
)
2317 vtop
->c
.i
= (vtop
->c
.i
!= 0);
2318 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2319 else if (dbt
== VT_PTR
)
2322 else if (dbt
!= VT_LLONG
) {
2323 uint32_t m
= ((dbt
& VT_BTYPE
) == VT_BYTE
? 0xff :
2324 (dbt
& VT_BTYPE
) == VT_SHORT
? 0xffff :
2327 if (!(dbt
& VT_UNSIGNED
))
2328 vtop
->c
.i
|= -(vtop
->c
.i
& ((m
>> 1) + 1));
2331 } else if (p
&& dbt
== VT_BOOL
) {
2334 } else if (!nocode_wanted
) {
2335 /* non constant case: generate code */
2337 /* convert from fp to fp */
2340 /* convert int to fp */
2343 /* convert fp to int */
2344 if (dbt
== VT_BOOL
) {
2348 /* we handle char/short/etc... with generic code */
2349 if (dbt
!= (VT_INT
| VT_UNSIGNED
) &&
2350 dbt
!= (VT_LLONG
| VT_UNSIGNED
) &&
2354 if (dbt
== VT_INT
&& (type
->t
& (VT_BTYPE
| VT_UNSIGNED
)) != dbt
) {
2355 /* additional cast for char/short... */
2360 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
2361 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
) {
2362 if ((sbt
& VT_BTYPE
) != VT_LLONG
) {
2363 /* scalar to long long */
2364 /* machine independent conversion */
2366 /* generate high word */
2367 if (sbt
== (VT_INT
| VT_UNSIGNED
)) {
2371 if (sbt
== VT_PTR
) {
2372 /* cast from pointer to int before we apply
2373 shift operation, which pointers don't support*/
2374 gen_cast(&int_type
);
2380 /* patch second register */
2381 vtop
[-1].r2
= vtop
->r
;
2385 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
||
2386 (dbt
& VT_BTYPE
) == VT_PTR
||
2387 (dbt
& VT_BTYPE
) == VT_FUNC
) {
2388 if ((sbt
& VT_BTYPE
) != VT_LLONG
&&
2389 (sbt
& VT_BTYPE
) != VT_PTR
&&
2390 (sbt
& VT_BTYPE
) != VT_FUNC
) {
2391 /* need to convert from 32bit to 64bit */
2393 if (sbt
!= (VT_INT
| VT_UNSIGNED
)) {
2394 #if defined(TCC_TARGET_ARM64)
2396 #elif defined(TCC_TARGET_X86_64)
2398 /* x86_64 specific: movslq */
2400 o(0xc0 + (REG_VALUE(r
) << 3) + REG_VALUE(r
));
2407 } else if (dbt
== VT_BOOL
) {
2408 /* scalar to bool */
2411 } else if ((dbt
& VT_BTYPE
) == VT_BYTE
||
2412 (dbt
& VT_BTYPE
) == VT_SHORT
) {
2413 if (sbt
== VT_PTR
) {
2414 vtop
->type
.t
= VT_INT
;
2415 tcc_warning("nonportable conversion from pointer to char/short");
2417 force_charshort_cast(dbt
);
2418 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
2419 } else if ((dbt
& VT_BTYPE
) == VT_INT
) {
2421 if ((sbt
& VT_BTYPE
) == VT_LLONG
) {
2422 /* from long long: just take low order word */
2426 /* if lvalue and single word type, nothing to do because
2427 the lvalue already contains the real type size (see
2428 VT_LVAL_xxx constants) */
2432 } else if ((dbt
& VT_BTYPE
) == VT_PTR
&& !(vtop
->r
& VT_LVAL
)) {
2433 /* if we are casting between pointer types,
2434 we must update the VT_LVAL_xxx size */
2435 vtop
->r
= (vtop
->r
& ~VT_LVAL_TYPE
)
2436 | (lvalue_type(type
->ref
->type
.t
) & VT_LVAL_TYPE
);
2441 /* return type size as known at compile time. Put alignment at 'a' */
2442 ST_FUNC
int type_size(CType
*type
, int *a
)
2447 bt
= type
->t
& VT_BTYPE
;
2448 if (bt
== VT_STRUCT
) {
2453 } else if (bt
== VT_PTR
) {
2454 if (type
->t
& VT_ARRAY
) {
2458 ts
= type_size(&s
->type
, a
);
2460 if (ts
< 0 && s
->c
< 0)
2468 } else if (bt
== VT_LDOUBLE
) {
2470 return LDOUBLE_SIZE
;
2471 } else if (bt
== VT_DOUBLE
|| bt
== VT_LLONG
) {
2472 #ifdef TCC_TARGET_I386
2473 #ifdef TCC_TARGET_PE
2478 #elif defined(TCC_TARGET_ARM)
2488 } else if (bt
== VT_INT
|| bt
== VT_FLOAT
) {
2491 } else if (bt
== VT_SHORT
) {
2494 } else if (bt
== VT_QLONG
|| bt
== VT_QFLOAT
) {
2497 } else if (bt
== VT_ENUM
) {
2499 /* Enums might be incomplete, so don't just return '4' here. */
2500 return type
->ref
->c
;
2502 /* char, void, function, _Bool */
2508 /* push type size as known at runtime time on top of value stack. Put
2510 ST_FUNC
void vla_runtime_type_size(CType
*type
, int *a
)
2512 if (type
->t
& VT_VLA
) {
2513 type_size(&type
->ref
->type
, a
);
2514 vset(&int_type
, VT_LOCAL
|VT_LVAL
, type
->ref
->c
);
2516 vpushi(type_size(type
, a
));
2520 static void vla_sp_restore(void) {
2521 if (vlas_in_scope
) {
2522 gen_vla_sp_restore(vla_sp_loc
);
2526 static void vla_sp_restore_root(void) {
2527 if (vlas_in_scope
) {
2528 gen_vla_sp_restore(vla_sp_root_loc
);
2532 /* return the pointed type of t */
2533 static inline CType
*pointed_type(CType
*type
)
2535 return &type
->ref
->type
;
2538 /* modify type so that its it is a pointer to type. */
2539 ST_FUNC
void mk_pointer(CType
*type
)
2542 s
= sym_push(SYM_FIELD
, type
, 0, -1);
2543 type
->t
= VT_PTR
| (type
->t
& ~VT_TYPE
);
2547 /* compare function types. OLD functions match any new functions */
2548 static int is_compatible_func(CType
*type1
, CType
*type2
)
2554 if (!is_compatible_types(&s1
->type
, &s2
->type
))
2556 /* check func_call */
2557 if (s1
->a
.func_call
!= s2
->a
.func_call
)
2559 /* XXX: not complete */
2560 if (s1
->c
== FUNC_OLD
|| s2
->c
== FUNC_OLD
)
2564 while (s1
!= NULL
) {
2567 if (!is_compatible_parameter_types(&s1
->type
, &s2
->type
))
2577 /* return true if type1 and type2 are the same. If unqualified is
2578 true, qualifiers on the types are ignored.
2580 - enums are not checked as gcc __builtin_types_compatible_p ()
2582 static int compare_types(CType
*type1
, CType
*type2
, int unqualified
)
2586 t1
= type1
->t
& VT_TYPE
;
2587 t2
= type2
->t
& VT_TYPE
;
2589 /* strip qualifiers before comparing */
2590 t1
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2591 t2
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2593 /* Default Vs explicit signedness only matters for char */
2594 if ((t1
& VT_BTYPE
) != VT_BYTE
) {
2598 /* An enum is compatible with (unsigned) int. Ideally we would
2599 store the enums signedness in type->ref.a.<some_bit> and
2600 only accept unsigned enums with unsigned int and vice versa.
2601 But one of our callers (gen_assign_cast) always strips VT_UNSIGNED
2602 from pointer target types, so we can't add it here either. */
2603 if ((t1
& VT_BTYPE
) == VT_ENUM
) {
2605 if (type1
->ref
->a
.unsigned_enum
)
2608 if ((t2
& VT_BTYPE
) == VT_ENUM
) {
2610 if (type2
->ref
->a
.unsigned_enum
)
2613 /* XXX: bitfields ? */
2616 /* test more complicated cases */
2617 bt1
= t1
& VT_BTYPE
;
2618 if (bt1
== VT_PTR
) {
2619 type1
= pointed_type(type1
);
2620 type2
= pointed_type(type2
);
2621 return is_compatible_types(type1
, type2
);
2622 } else if (bt1
== VT_STRUCT
) {
2623 return (type1
->ref
== type2
->ref
);
2624 } else if (bt1
== VT_FUNC
) {
2625 return is_compatible_func(type1
, type2
);
2631 /* return true if type1 and type2 are exactly the same (including
2634 static int is_compatible_types(CType
*type1
, CType
*type2
)
2636 return compare_types(type1
,type2
,0);
2639 /* return true if type1 and type2 are the same (ignoring qualifiers).
2641 static int is_compatible_parameter_types(CType
*type1
, CType
*type2
)
2643 return compare_types(type1
,type2
,1);
2646 /* print a type. If 'varstr' is not NULL, then the variable is also
2647 printed in the type */
2649 /* XXX: add array and function pointers */
2650 static void type_to_str(char *buf
, int buf_size
,
2651 CType
*type
, const char *varstr
)
2658 t
= type
->t
& VT_TYPE
;
2661 if (t
& VT_CONSTANT
)
2662 pstrcat(buf
, buf_size
, "const ");
2663 if (t
& VT_VOLATILE
)
2664 pstrcat(buf
, buf_size
, "volatile ");
2665 if ((t
& (VT_DEFSIGN
| VT_UNSIGNED
)) == (VT_DEFSIGN
| VT_UNSIGNED
))
2666 pstrcat(buf
, buf_size
, "unsigned ");
2667 else if (t
& VT_DEFSIGN
)
2668 pstrcat(buf
, buf_size
, "signed ");
2698 tstr
= "long double";
2700 pstrcat(buf
, buf_size
, tstr
);
2704 if (bt
== VT_STRUCT
)
2708 pstrcat(buf
, buf_size
, tstr
);
2709 v
= type
->ref
->v
& ~SYM_STRUCT
;
2710 if (v
>= SYM_FIRST_ANOM
)
2711 pstrcat(buf
, buf_size
, "<anonymous>");
2713 pstrcat(buf
, buf_size
, get_tok_str(v
, NULL
));
2717 type_to_str(buf
, buf_size
, &s
->type
, varstr
);
2718 pstrcat(buf
, buf_size
, "(");
2720 while (sa
!= NULL
) {
2721 type_to_str(buf1
, sizeof(buf1
), &sa
->type
, NULL
);
2722 pstrcat(buf
, buf_size
, buf1
);
2725 pstrcat(buf
, buf_size
, ", ");
2727 pstrcat(buf
, buf_size
, ")");
2732 snprintf(buf1
, sizeof(buf1
), "%s[%ld]", varstr
? varstr
: "", s
->c
);
2733 type_to_str(buf
, buf_size
, &s
->type
, buf1
);
2736 pstrcpy(buf1
, sizeof(buf1
), "*");
2737 if (t
& VT_CONSTANT
)
2738 pstrcat(buf1
, buf_size
, "const ");
2739 if (t
& VT_VOLATILE
)
2740 pstrcat(buf1
, buf_size
, "volatile ");
2742 pstrcat(buf1
, sizeof(buf1
), varstr
);
2743 type_to_str(buf
, buf_size
, &s
->type
, buf1
);
2747 pstrcat(buf
, buf_size
, " ");
2748 pstrcat(buf
, buf_size
, varstr
);
2753 /* verify type compatibility to store vtop in 'dt' type, and generate
2755 static void gen_assign_cast(CType
*dt
)
2757 CType
*st
, *type1
, *type2
, tmp_type1
, tmp_type2
;
2758 char buf1
[256], buf2
[256];
2761 st
= &vtop
->type
; /* source type */
2762 dbt
= dt
->t
& VT_BTYPE
;
2763 sbt
= st
->t
& VT_BTYPE
;
2764 if (sbt
== VT_VOID
|| dbt
== VT_VOID
) {
2765 if (sbt
== VT_VOID
&& dbt
== VT_VOID
)
2767 It is Ok if both are void
2773 gcc accepts this program
2776 tcc_error("cannot cast from/to void");
2778 if (dt
->t
& VT_CONSTANT
)
2779 tcc_warning("assignment of read-only location");
2782 /* special cases for pointers */
2783 /* '0' can also be a pointer */
2784 if (is_null_pointer(vtop
))
2786 /* accept implicit pointer to integer cast with warning */
2787 if (is_integer_btype(sbt
)) {
2788 tcc_warning("assignment makes pointer from integer without a cast");
2791 type1
= pointed_type(dt
);
2792 /* a function is implicitely a function pointer */
2793 if (sbt
== VT_FUNC
) {
2794 if ((type1
->t
& VT_BTYPE
) != VT_VOID
&&
2795 !is_compatible_types(pointed_type(dt
), st
))
2796 tcc_warning("assignment from incompatible pointer type");
2801 type2
= pointed_type(st
);
2802 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
2803 (type2
->t
& VT_BTYPE
) == VT_VOID
) {
2804 /* void * can match anything */
2806 /* exact type match, except for qualifiers */
2809 tmp_type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2810 tmp_type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2811 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
2812 /* Like GCC don't warn by default for merely changes
2813 in pointer target signedness. Do warn for different
2814 base types, though, in particular for unsigned enums
2815 and signed int targets. */
2816 if ((tmp_type1
.t
& (VT_DEFSIGN
| VT_UNSIGNED
)) !=
2817 (tmp_type2
.t
& (VT_DEFSIGN
| VT_UNSIGNED
)) &&
2818 (tmp_type1
.t
& VT_BTYPE
) == (tmp_type2
.t
& VT_BTYPE
))
2821 tcc_warning("assignment from incompatible pointer type");
2824 /* check const and volatile */
2825 if ((!(type1
->t
& VT_CONSTANT
) && (type2
->t
& VT_CONSTANT
)) ||
2826 (!(type1
->t
& VT_VOLATILE
) && (type2
->t
& VT_VOLATILE
)))
2827 tcc_warning("assignment discards qualifiers from pointer target type");
2833 if (sbt
== VT_PTR
|| sbt
== VT_FUNC
) {
2834 tcc_warning("assignment makes integer from pointer without a cast");
2835 } else if (sbt
== VT_STRUCT
) {
2836 goto case_VT_STRUCT
;
2838 /* XXX: more tests */
2844 tmp_type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2845 tmp_type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2846 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
2848 type_to_str(buf1
, sizeof(buf1
), st
, NULL
);
2849 type_to_str(buf2
, sizeof(buf2
), dt
, NULL
);
2850 tcc_error("cannot cast '%s' to '%s'", buf1
, buf2
);
2858 /* store vtop in lvalue pushed on stack */
2859 ST_FUNC
void vstore(void)
2861 int sbt
, dbt
, ft
, r
, t
, size
, align
, bit_size
, bit_pos
, rc
, delayed_cast
;
2863 ft
= vtop
[-1].type
.t
;
2864 sbt
= vtop
->type
.t
& VT_BTYPE
;
2865 dbt
= ft
& VT_BTYPE
;
2866 if ((((sbt
== VT_INT
|| sbt
== VT_SHORT
) && dbt
== VT_BYTE
) ||
2867 (sbt
== VT_INT
&& dbt
== VT_SHORT
))
2868 && !(vtop
->type
.t
& VT_BITFIELD
)) {
2869 /* optimize char/short casts */
2870 delayed_cast
= VT_MUSTCAST
;
2871 vtop
->type
.t
= (ft
& VT_TYPE
& ~VT_BITFIELD
&
2872 ((1 << VT_STRUCT_SHIFT
) - 1));
2873 /* XXX: factorize */
2874 if (ft
& VT_CONSTANT
)
2875 tcc_warning("assignment of read-only location");
2878 if (!(ft
& VT_BITFIELD
))
2879 gen_assign_cast(&vtop
[-1].type
);
2882 if (sbt
== VT_STRUCT
) {
2883 /* if structure, only generate pointer */
2884 /* structure assignment : generate memcpy */
2885 /* XXX: optimize if small size */
2886 if (!nocode_wanted
) {
2887 size
= type_size(&vtop
->type
, &align
);
2891 vtop
->type
.t
= VT_PTR
;
2894 /* address of memcpy() */
2897 vpush_global_sym(&func_old_type
, TOK_memcpy8
);
2898 else if(!(align
& 3))
2899 vpush_global_sym(&func_old_type
, TOK_memcpy4
);
2902 /* Use memmove, rather than memcpy, as dest and src may be same: */
2903 vpush_global_sym(&func_old_type
, TOK_memmove
);
2908 vtop
->type
.t
= VT_PTR
;
2917 /* leave source on stack */
2918 } else if (ft
& VT_BITFIELD
) {
2919 /* bitfield store handling */
2921 /* save lvalue as expression result (example: s.b = s.a = n;) */
2922 vdup(), vtop
[-1] = vtop
[-2];
2924 bit_pos
= (ft
>> VT_STRUCT_SHIFT
) & 0x3f;
2925 bit_size
= (ft
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
2926 /* remove bit field info to avoid loops */
2927 vtop
[-1].type
.t
= ft
& ~VT_BITFIELD
& ((1 << VT_STRUCT_SHIFT
) - 1);
2929 if((ft
& VT_BTYPE
) == VT_BOOL
) {
2930 gen_cast(&vtop
[-1].type
);
2931 vtop
[-1].type
.t
= (vtop
[-1].type
.t
& ~VT_BTYPE
) | (VT_BYTE
| VT_UNSIGNED
);
2934 /* duplicate destination */
2936 vtop
[-1] = vtop
[-2];
2938 /* mask and shift source */
2939 if((ft
& VT_BTYPE
) != VT_BOOL
) {
2940 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2941 vpushll((1ULL << bit_size
) - 1ULL);
2943 vpushi((1 << bit_size
) - 1);
2949 /* load destination, mask and or with source */
2951 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2952 vpushll(~(((1ULL << bit_size
) - 1ULL) << bit_pos
));
2954 vpushi(~(((1 << bit_size
) - 1) << bit_pos
));
2960 /* ... and discard */
2964 if (!nocode_wanted
) {
2965 #ifdef CONFIG_TCC_BCHECK
2966 /* bound check case */
2967 if (vtop
[-1].r
& VT_MUSTBOUND
) {
2976 #ifdef TCC_TARGET_X86_64
2977 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
2979 } else if ((ft
& VT_BTYPE
) == VT_QFLOAT
) {
2984 r
= gv(rc
); /* generate value */
2985 /* if lvalue was saved on stack, must read it */
2986 if ((vtop
[-1].r
& VT_VALMASK
) == VT_LLOCAL
) {
2988 t
= get_reg(RC_INT
);
2989 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2994 sv
.r
= VT_LOCAL
| VT_LVAL
;
2995 sv
.c
.i
= vtop
[-1].c
.i
;
2997 vtop
[-1].r
= t
| VT_LVAL
;
2999 /* two word case handling : store second register at word + 4 (or +8 for x86-64) */
3000 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
3001 if (((ft
& VT_BTYPE
) == VT_QLONG
) || ((ft
& VT_BTYPE
) == VT_QFLOAT
)) {
3002 int addr_type
= VT_LLONG
, load_size
= 8, load_type
= ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) ? VT_LLONG
: VT_DOUBLE
;
3004 if ((ft
& VT_BTYPE
) == VT_LLONG
) {
3005 int addr_type
= VT_INT
, load_size
= 4, load_type
= VT_INT
;
3007 vtop
[-1].type
.t
= load_type
;
3010 /* convert to int to increment easily */
3011 vtop
->type
.t
= addr_type
;
3017 vtop
[-1].type
.t
= load_type
;
3018 /* XXX: it works because r2 is spilled last ! */
3019 store(vtop
->r2
, vtop
- 1);
3025 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
3026 vtop
->r
|= delayed_cast
;
3030 /* post defines POST/PRE add. c is the token ++ or -- */
3031 ST_FUNC
void inc(int post
, int c
)
3034 vdup(); /* save lvalue */
3037 gv_dup(); /* duplicate value */
3039 vdup(); /* duplicate value */
3044 vpushi(c
- TOK_MID
);
3046 vstore(); /* store value */
3048 vpop(); /* if post op, return saved value */
3051 ST_FUNC
void parse_mult_str (CString
*astr
, const char *msg
)
3053 /* read the string */
3057 while (tok
== TOK_STR
) {
3058 /* XXX: add \0 handling too ? */
3059 cstr_cat(astr
, tokc
.str
.data
, -1);
3062 cstr_ccat(astr
, '\0');
3065 /* Parse GNUC __attribute__ extension. Currently, the following
3066 extensions are recognized:
3067 - aligned(n) : set data/function alignment.
3068 - packed : force data alignment to 1
3069 - section(x) : generate data/code in this section.
3070 - unused : currently ignored, but may be used someday.
3071 - regparm(n) : pass function parameters in registers (i386 only)
3073 static void parse_attribute(AttributeDef
*ad
)
3078 while (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
) {
3082 while (tok
!= ')') {
3083 if (tok
< TOK_IDENT
)
3084 expect("attribute name");
3091 parse_mult_str(&astr
, "section name");
3092 ad
->section
= find_section(tcc_state
, (char *)astr
.data
);
3099 parse_mult_str(&astr
, "alias(\"target\")");
3100 ad
->alias_target
= /* save string as token, for later */
3101 tok_alloc((char*)astr
.data
, astr
.size
-1)->tok
;
3105 case TOK_VISIBILITY1
:
3106 case TOK_VISIBILITY2
:
3108 parse_mult_str(&astr
,
3109 "visibility(\"default|hidden|internal|protected\")");
3110 if (!strcmp (astr
.data
, "default"))
3111 ad
->a
.visibility
= STV_DEFAULT
;
3112 else if (!strcmp (astr
.data
, "hidden"))
3113 ad
->a
.visibility
= STV_HIDDEN
;
3114 else if (!strcmp (astr
.data
, "internal"))
3115 ad
->a
.visibility
= STV_INTERNAL
;
3116 else if (!strcmp (astr
.data
, "protected"))
3117 ad
->a
.visibility
= STV_PROTECTED
;
3119 expect("visibility(\"default|hidden|internal|protected\")");
3128 if (n
<= 0 || (n
& (n
- 1)) != 0)
3129 tcc_error("alignment must be a positive power of two");
3146 /* currently, no need to handle it because tcc does not
3147 track unused objects */
3151 /* currently, no need to handle it because tcc does not
3152 track unused objects */
3157 ad
->a
.func_call
= FUNC_CDECL
;
3162 ad
->a
.func_call
= FUNC_STDCALL
;
3164 #ifdef TCC_TARGET_I386
3174 ad
->a
.func_call
= FUNC_FASTCALL1
+ n
- 1;
3180 ad
->a
.func_call
= FUNC_FASTCALLW
;
3187 ad
->a
.mode
= VT_LLONG
+ 1;
3190 ad
->a
.mode
= VT_BYTE
+ 1;
3193 ad
->a
.mode
= VT_SHORT
+ 1;
3197 ad
->a
.mode
= VT_INT
+ 1;
3200 tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok
, NULL
));
3207 ad
->a
.func_export
= 1;
3210 ad
->a
.func_import
= 1;
3213 if (tcc_state
->warn_unsupported
)
3214 tcc_warning("'%s' attribute ignored", get_tok_str(t
, NULL
));
3215 /* skip parameters */
3217 int parenthesis
= 0;
3221 else if (tok
== ')')
3224 } while (parenthesis
&& tok
!= -1);
3237 static Sym
* find_field (CType
*type
, int v
)
3241 while ((s
= s
->next
) != NULL
) {
3242 if ((s
->v
& SYM_FIELD
) && (s
->v
& ~SYM_FIELD
) >= SYM_FIRST_ANOM
) {
3243 Sym
*ret
= find_field (&s
->type
, v
);
3253 static void struct_layout(CType
*type
, AttributeDef
*ad
)
3255 int align
, maxalign
, offset
, c
;
3260 for (f
= type
->ref
->next
; f
; f
= f
->next
) {
3261 int extra_bytes
= f
->c
;
3263 int size
= type_size(&f
->type
, &align
);
3264 if (f
->type
.t
& VT_BITFIELD
)
3265 bit_pos
= (f
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
3270 } else if (ad
->a
.packed
) {
3273 if (extra_bytes
) c
+= extra_bytes
;
3274 else if (bit_pos
== 0) {
3275 if (type
->ref
->type
.t
== TOK_STRUCT
) {
3276 c
= (c
+ align
- 1) & -align
;
3285 if (align
> maxalign
)
3289 printf("set field %s offset=%d",
3290 get_tok_str(f
->v
& ~SYM_FIELD
, NULL
), offset
);
3291 if (f
->type
.t
& VT_BITFIELD
) {
3292 printf(" pos=%d size=%d",
3293 (f
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f,
3294 (f
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f);
3299 if (f
->v
& SYM_FIRST_ANOM
&& (f
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
3301 /* An anonymous struct/union. Adjust member offsets
3302 to reflect the real offset of our containing struct.
3303 Also set the offset of this anon member inside
3304 the outer struct to be zero. Via this it
3305 works when accessing the field offset directly
3306 (from base object), as well as when recursing
3307 members in initializer handling. */
3308 int v2
= f
->type
.ref
->v
;
3309 if (!(v2
& SYM_FIELD
) &&
3310 (v2
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
3312 /* This happens only with MS extensions. The
3313 anon member has a named struct type, so it
3314 potentially is shared with other references.
3315 We need to unshare members so we can modify
3318 f
->type
.ref
= sym_push(anon_sym
++ | SYM_FIELD
,
3319 &f
->type
.ref
->type
, 0,
3321 pps
= &f
->type
.ref
->next
;
3322 while ((ass
= ass
->next
) != NULL
) {
3323 *pps
= sym_push(ass
->v
, &ass
->type
, 0, ass
->c
);
3324 pps
= &((*pps
)->next
);
3329 while ((ass
= ass
->next
) != NULL
)
3338 /* store size and alignment */
3339 type
->ref
->c
= (c
+ maxalign
- 1) & -maxalign
;
3340 type
->ref
->r
= maxalign
;
3343 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
3344 static void struct_decl(CType
*type
, AttributeDef
*ad
, int u
)
3347 int a
, v
, size
, align
, flexible
, alignoverride
;
3349 int bit_size
, bit_pos
, bsize
, bt
, prevbt
;
3354 a
= tok
; /* save decl type */
3356 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3357 parse_attribute(ad
);
3361 /* struct already defined ? return it */
3363 expect("struct/union/enum name");
3365 if (s
&& (s
->scope
== local_scope
|| (tok
!= '{' && tok
!= ';'))) {
3367 tcc_error("redefinition of '%s'", get_tok_str(v
, NULL
));
3373 /* Record the original enum/struct/union token. */
3376 /* we put an undefined size for struct/union */
3377 s
= sym_push(v
| SYM_STRUCT
, &type1
, 0, -1);
3378 s
->r
= 0; /* default alignment is zero as gcc */
3379 /* put struct/union/enum name in type */
3387 tcc_error("struct/union/enum already defined");
3388 /* cannot be empty */
3390 /* non empty enums are not allowed */
3391 if (a
== TOK_ENUM
) {
3395 CType
*t
= &int_type
;
3398 expect("identifier");
3400 if (ss
&& !local_stack
)
3401 tcc_error("redefinition of enumerator '%s'",
3402 get_tok_str(v
, NULL
));
3406 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
3409 /* We really want to support long long enums
3410 on i386 as well, but the Sym structure only
3411 holds a 'long' for associated constants,
3412 and enlarging it would bump its size (no
3413 available padding). So punt for now. */
3419 if (c
!= (int)c
&& (unsigned long)c
!= (unsigned int)c
)
3420 seen_wide
= 1, t
= &size_type
;
3421 /* enum symbols have static storage */
3422 ss
= sym_push(v
, t
, VT_CONST
, c
);
3423 ss
->type
.t
|= VT_STATIC
;
3428 /* NOTE: we accept a trailing comma */
3433 s
->a
.unsigned_enum
= 1;
3434 s
->c
= type_size(seen_wide
? &size_type
: &int_type
, &align
);
3441 while (tok
!= '}') {
3442 if (!parse_btype(&btype
, &ad1
)) {
3449 tcc_error("flexible array member '%s' not at the end of struct",
3450 get_tok_str(v
, NULL
));
3455 type_decl(&type1
, &ad1
, &v
, TYPE_DIRECT
| TYPE_ABSTRACT
);
3457 if ((type1
.t
& VT_BTYPE
) != VT_STRUCT
)
3458 expect("identifier");
3460 int v
= btype
.ref
->v
;
3461 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
3462 if (tcc_state
->ms_extensions
== 0)
3463 expect("identifier");
3467 if (type_size(&type1
, &align
) < 0) {
3468 if ((a
== TOK_STRUCT
) && (type1
.t
& VT_ARRAY
) && c
)
3471 tcc_error("field '%s' has incomplete type",
3472 get_tok_str(v
, NULL
));
3474 if ((type1
.t
& VT_BTYPE
) == VT_FUNC
||
3475 (type1
.t
& (VT_TYPEDEF
| VT_STATIC
| VT_EXTERN
| VT_INLINE
)))
3476 tcc_error("invalid type for '%s'",
3477 get_tok_str(v
, NULL
));
3481 bit_size
= expr_const();
3482 /* XXX: handle v = 0 case for messages */
3484 tcc_error("negative width in bit-field '%s'",
3485 get_tok_str(v
, NULL
));
3486 if (v
&& bit_size
== 0)
3487 tcc_error("zero width for bit-field '%s'",
3488 get_tok_str(v
, NULL
));
3490 size
= type_size(&type1
, &align
);
3491 /* Only remember non-default alignment. */
3493 if (ad1
.a
.aligned
) {
3494 if (align
< ad1
.a
.aligned
)
3495 alignoverride
= ad1
.a
.aligned
;
3496 } else if (ad1
.a
.packed
|| ad
->a
.packed
) {
3498 } else if (*tcc_state
->pack_stack_ptr
) {
3499 if (align
> *tcc_state
->pack_stack_ptr
)
3500 alignoverride
= *tcc_state
->pack_stack_ptr
;
3502 if (bit_size
>= 0) {
3503 bt
= type1
.t
& VT_BTYPE
;
3510 tcc_error("bitfields must have scalar type");
3512 if (bit_size
> bsize
) {
3513 tcc_error("width of '%s' exceeds its type",
3514 get_tok_str(v
, NULL
));
3515 } else if (bit_size
== bsize
) {
3516 /* no need for bit fields */
3518 } else if (bit_size
== 0) {
3519 /* XXX: what to do if only padding in a
3521 /* zero size: means to pad */
3524 /* if type change, union, or will overrun
3525 * allignment slot, start at a newly
3527 if ((bit_pos
+ bit_size
) > bsize
||
3528 bt
!= prevbt
|| a
== TOK_UNION
)
3530 /* XXX: handle LSB first */
3531 type1
.t
|= VT_BITFIELD
|
3532 (bit_pos
<< VT_STRUCT_SHIFT
) |
3533 (bit_size
<< (VT_STRUCT_SHIFT
+ 6));
3534 /* without ms-bitfields, allocate the
3535 * minimum number of bytes necessary,
3536 * adding single bytes as needed */
3537 if (!tcc_state
->ms_bitfields
) {
3539 /* minimum bytes for new bitfield */
3540 size
= (bit_size
+ 7) / 8;
3542 /* enough spare bits already allocated? */
3543 int add_size
= (bit_pos
- 1) % 8 + 1 + bit_size
;
3544 if (add_size
> 8) /* doesn't fit */
3545 extra_bytes
= (add_size
- 1) / 8;
3548 bit_pos
+= bit_size
;
3554 if (v
!= 0 || (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
3555 /* Remember we've seen a real field to check
3556 for placement of flexible array member. */
3559 if (v
== 0 && (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
3560 /* See struct_layout for special casing
3561 anonymous member of struct type. */
3565 ss
= sym_push(v
| SYM_FIELD
, &type1
, alignoverride
, extra_bytes
);
3569 if (tok
== ';' || tok
== TOK_EOF
)
3576 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3577 parse_attribute(ad
);
3578 struct_layout(type
, ad
);
3583 /* return 1 if basic type is a type size (short, long, long long) */
3584 ST_FUNC
int is_btype_size(int bt
)
3586 return bt
== VT_SHORT
|| bt
== VT_LONG
|| bt
== VT_LLONG
;
3589 /* Add type qualifiers to a type. If the type is an array then the qualifiers
3590 are added to the element type, copied because it could be a typedef. */
3591 static void parse_btype_qualify(CType
*type
, int qualifiers
)
3593 while (type
->t
& VT_ARRAY
) {
3594 type
->ref
= sym_push(SYM_FIELD
, &type
->ref
->type
, 0, type
->ref
->c
);
3595 type
= &type
->ref
->type
;
3597 type
->t
|= qualifiers
;
3600 /* return 0 if no type declaration. otherwise, return the basic type
3603 static int parse_btype(CType
*type
, AttributeDef
*ad
)
3605 int t
, u
, bt_size
, complete
, type_found
, typespec_found
;
3609 memset(ad
, 0, sizeof(AttributeDef
));
3617 /* currently, we really ignore extension */
3628 tcc_error("too many basic types");
3630 bt_size
= is_btype_size (u
& VT_BTYPE
);
3631 if (u
== VT_INT
|| (!bt_size
&& !(t
& VT_TYPEDEF
)))
3646 if ((t
& VT_BTYPE
) == VT_DOUBLE
) {
3647 #ifndef TCC_TARGET_PE
3648 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3650 } else if ((t
& VT_BTYPE
) == VT_LONG
) {
3651 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3657 #ifdef TCC_TARGET_ARM64
3659 /* GCC's __uint128_t appears in some Linux header files. Make it a
3660 synonym for long double to get the size and alignment right. */
3672 if ((t
& VT_BTYPE
) == VT_LONG
) {
3673 #ifdef TCC_TARGET_PE
3674 t
= (t
& ~VT_BTYPE
) | VT_DOUBLE
;
3676 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3684 struct_decl(&type1
, ad
, VT_ENUM
);
3687 type
->ref
= type1
.ref
;
3691 struct_decl(&type1
, ad
, VT_STRUCT
);
3694 /* type modifiers */
3699 parse_btype_qualify(type
, VT_CONSTANT
);
3707 parse_btype_qualify(type
, VT_VOLATILE
);
3714 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == (VT_DEFSIGN
|VT_UNSIGNED
))
3715 tcc_error("signed and unsigned modifier");
3728 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == VT_DEFSIGN
)
3729 tcc_error("signed and unsigned modifier");
3730 t
|= VT_DEFSIGN
| VT_UNSIGNED
;
3755 /* GNUC attribute */
3756 case TOK_ATTRIBUTE1
:
3757 case TOK_ATTRIBUTE2
:
3758 parse_attribute(ad
);
3761 t
= (t
& ~VT_BTYPE
) | u
;
3769 parse_expr_type(&type1
);
3770 /* remove all storage modifiers except typedef */
3771 type1
.t
&= ~(VT_STORAGE
&~VT_TYPEDEF
);
3777 if (!s
|| !(s
->type
.t
& VT_TYPEDEF
))
3780 type
->t
= ((s
->type
.t
& ~VT_TYPEDEF
) |
3781 (t
& ~(VT_CONSTANT
| VT_VOLATILE
)));
3782 type
->ref
= s
->type
.ref
;
3783 if (t
& (VT_CONSTANT
| VT_VOLATILE
))
3784 parse_btype_qualify(type
, t
& (VT_CONSTANT
| VT_VOLATILE
));
3788 /* get attributes from typedef */
3789 if (0 == ad
->a
.aligned
)
3790 ad
->a
.aligned
= s
->a
.aligned
;
3791 if (0 == ad
->a
.func_call
)
3792 ad
->a
.func_call
= s
->a
.func_call
;
3793 ad
->a
.packed
|= s
->a
.packed
;
3802 if (tcc_state
->char_is_unsigned
) {
3803 if ((t
& (VT_DEFSIGN
|VT_BTYPE
)) == VT_BYTE
)
3807 /* long is never used as type */
3808 if ((t
& VT_BTYPE
) == VT_LONG
)
3809 #if (!defined TCC_TARGET_X86_64 && !defined TCC_TARGET_ARM64) || \
3810 defined TCC_TARGET_PE
3811 t
= (t
& ~VT_BTYPE
) | VT_INT
;
3813 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3819 /* convert a function parameter type (array to pointer and function to
3820 function pointer) */
3821 static inline void convert_parameter_type(CType
*pt
)
3823 /* remove const and volatile qualifiers (XXX: const could be used
3824 to indicate a const function parameter */
3825 pt
->t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3826 /* array must be transformed to pointer according to ANSI C */
3828 if ((pt
->t
& VT_BTYPE
) == VT_FUNC
) {
3833 ST_FUNC
void parse_asm_str(CString
*astr
)
3836 parse_mult_str(astr
, "string constant");
3839 /* Parse an asm label and return the token */
3840 static int asm_label_instr(void)
3846 parse_asm_str(&astr
);
3849 printf("asm_alias: \"%s\"\n", (char *)astr
.data
);
3851 v
= tok_alloc(astr
.data
, astr
.size
- 1)->tok
;
3856 static void post_type(CType
*type
, AttributeDef
*ad
, int storage
)
3858 int n
, l
, t1
, arg_size
, align
;
3859 Sym
**plast
, *s
, *first
;
3864 /* function declaration */
3872 /* read param name and compute offset */
3873 if (l
!= FUNC_OLD
) {
3874 if (!parse_btype(&pt
, &ad1
)) {
3876 tcc_error("invalid type");
3883 if ((pt
.t
& VT_BTYPE
) == VT_VOID
&& tok
== ')')
3885 type_decl(&pt
, &ad1
, &n
, TYPE_DIRECT
| TYPE_ABSTRACT
);
3886 if ((pt
.t
& VT_BTYPE
) == VT_VOID
)
3887 tcc_error("parameter declared as void");
3888 arg_size
+= (type_size(&pt
, &align
) + PTR_SIZE
- 1) / PTR_SIZE
;
3893 expect("identifier");
3897 convert_parameter_type(&pt
);
3898 s
= sym_push(n
| SYM_FIELD
, &pt
, 0, 0);
3904 if (l
== FUNC_NEW
&& tok
== TOK_DOTS
) {
3911 /* if no parameters, then old type prototype */
3915 /* NOTE: const is ignored in returned type as it has a special
3916 meaning in gcc / C++ */
3917 type
->t
&= ~VT_CONSTANT
;
3918 /* some ancient pre-K&R C allows a function to return an array
3919 and the array brackets to be put after the arguments, such
3920 that "int c()[]" means something like "int[] c()" */
3923 skip(']'); /* only handle simple "[]" */
3926 /* we push a anonymous symbol which will contain the function prototype */
3927 ad
->a
.func_args
= arg_size
;
3928 s
= sym_push(SYM_FIELD
, type
, 0, l
);
3933 } else if (tok
== '[') {
3934 int saved_nocode_wanted
= nocode_wanted
;
3935 /* array definition */
3937 if (tok
== TOK_RESTRICT1
)
3942 if (!local_stack
|| (storage
& VT_STATIC
))
3943 vpushi(expr_const());
3945 /* VLAs (which can only happen with local_stack && !VT_STATIC)
3946 length must always be evaluated, even under nocode_wanted,
3947 so that its size slot is initialized (e.g. under sizeof
3952 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3955 tcc_error("invalid array size");
3957 if (!is_integer_btype(vtop
->type
.t
& VT_BTYPE
))
3958 tcc_error("size of variable length array should be an integer");
3963 /* parse next post type */
3964 post_type(type
, ad
, storage
);
3965 if (type
->t
== VT_FUNC
)
3966 tcc_error("declaration of an array of functions");
3967 t1
|= type
->t
& VT_VLA
;
3970 loc
-= type_size(&int_type
, &align
);
3974 vla_runtime_type_size(type
, &align
);
3976 vset(&int_type
, VT_LOCAL
|VT_LVAL
, n
);
3982 nocode_wanted
= saved_nocode_wanted
;
3984 /* we push an anonymous symbol which will contain the array
3986 s
= sym_push(SYM_FIELD
, type
, 0, n
);
3987 type
->t
= (t1
? VT_VLA
: VT_ARRAY
) | VT_PTR
;
3992 /* Parse a type declaration (except basic type), and return the type
3993 in 'type'. 'td' is a bitmask indicating which kind of type decl is
3994 expected. 'type' should contain the basic type. 'ad' is the
3995 attribute definition of the basic type. It can be modified by
3998 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
)
4001 CType type1
, *type2
;
4002 int qualifiers
, storage
;
4004 while (tok
== '*') {
4012 qualifiers
|= VT_CONSTANT
;
4017 qualifiers
|= VT_VOLATILE
;
4023 /* XXX: clarify attribute handling */
4024 case TOK_ATTRIBUTE1
:
4025 case TOK_ATTRIBUTE2
:
4026 parse_attribute(ad
);
4030 type
->t
|= qualifiers
;
4033 /* recursive type */
4034 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
4035 type1
.t
= 0; /* XXX: same as int */
4038 /* XXX: this is not correct to modify 'ad' at this point, but
4039 the syntax is not clear */
4040 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
4041 parse_attribute(ad
);
4042 type_decl(&type1
, ad
, v
, td
);
4045 /* type identifier */
4046 if (tok
>= TOK_IDENT
&& (td
& TYPE_DIRECT
)) {
4050 if (!(td
& TYPE_ABSTRACT
))
4051 expect("identifier");
4055 storage
= type
->t
& VT_STORAGE
;
4056 type
->t
&= ~VT_STORAGE
;
4057 post_type(type
, ad
, storage
);
4059 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
4060 parse_attribute(ad
);
4064 /* append type at the end of type1 */
4077 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
4078 ST_FUNC
int lvalue_type(int t
)
4083 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
4085 else if (bt
== VT_SHORT
)
4089 if (t
& VT_UNSIGNED
)
4090 r
|= VT_LVAL_UNSIGNED
;
4094 /* indirection with full error checking and bound check */
4095 ST_FUNC
void indir(void)
4097 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
) {
4098 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FUNC
)
4102 if ((vtop
->r
& VT_LVAL
) && !nocode_wanted
)
4104 vtop
->type
= *pointed_type(&vtop
->type
);
4105 /* Arrays and functions are never lvalues */
4106 if (!(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_VLA
)
4107 && (vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
4108 vtop
->r
|= lvalue_type(vtop
->type
.t
);
4109 /* if bound checking, the referenced pointer must be checked */
4110 #ifdef CONFIG_TCC_BCHECK
4111 if (tcc_state
->do_bounds_check
)
4112 vtop
->r
|= VT_MUSTBOUND
;
4117 /* pass a parameter to a function and do type checking and casting */
4118 static void gfunc_param_typed(Sym
*func
, Sym
*arg
)
4123 func_type
= func
->c
;
4124 if (func_type
== FUNC_OLD
||
4125 (func_type
== FUNC_ELLIPSIS
&& arg
== NULL
)) {
4126 /* default casting : only need to convert float to double */
4127 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
) {
4130 } else if (vtop
->type
.t
& VT_BITFIELD
) {
4131 type
.t
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
4132 type
.ref
= vtop
->type
.ref
;
4135 } else if (arg
== NULL
) {
4136 tcc_error("too many arguments to function");
4139 type
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
4140 gen_assign_cast(&type
);
4144 /* parse an expression of the form '(type)' or '(expr)' and return its
4146 static void parse_expr_type(CType
*type
)
4152 if (parse_btype(type
, &ad
)) {
4153 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
4160 static void parse_type(CType
*type
)
4165 if (!parse_btype(type
, &ad
)) {
4168 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
4171 static void vpush_tokc(int t
)
4176 vsetc(&type
, VT_CONST
, &tokc
);
4179 ST_FUNC
void unary(void)
4181 int n
, t
, align
, size
, r
, sizeof_caller
;
4186 sizeof_caller
= in_sizeof
;
4188 /* XXX: GCC 2.95.3 does not generate a table although it should be
4202 vpush_tokc(VT_INT
| VT_UNSIGNED
);
4206 vpush_tokc(VT_LLONG
);
4210 vpush_tokc(VT_LLONG
| VT_UNSIGNED
);
4214 vpush_tokc(VT_FLOAT
);
4218 vpush_tokc(VT_DOUBLE
);
4222 vpush_tokc(VT_LDOUBLE
);
4225 case TOK___FUNCTION__
:
4227 goto tok_identifier
;
4233 /* special function name identifier */
4234 len
= strlen(funcname
) + 1;
4235 /* generate char[len] type */
4240 vpush_ref(&type
, data_section
, data_section
->data_offset
, len
);
4241 ptr
= section_ptr_add(data_section
, len
);
4242 memcpy(ptr
, funcname
, len
);
4247 #ifdef TCC_TARGET_PE
4248 t
= VT_SHORT
| VT_UNSIGNED
;
4254 /* string parsing */
4257 if (tcc_state
->warn_write_strings
)
4262 memset(&ad
, 0, sizeof(AttributeDef
));
4263 decl_initializer_alloc(&type
, &ad
, VT_CONST
, 2, 0, 0);
4268 if (parse_btype(&type
, &ad
)) {
4269 type_decl(&type
, &ad
, &n
, TYPE_ABSTRACT
);
4271 /* check ISOC99 compound literal */
4273 /* data is allocated locally by default */
4278 /* all except arrays are lvalues */
4279 if (!(type
.t
& VT_ARRAY
))
4280 r
|= lvalue_type(type
.t
);
4281 memset(&ad
, 0, sizeof(AttributeDef
));
4282 decl_initializer_alloc(&type
, &ad
, r
, 1, 0, 0);
4284 if (sizeof_caller
) {
4291 } else if (tok
== '{') {
4293 tcc_error("expected constant");
4294 /* save all registers */
4297 /* statement expression : we do not accept break/continue
4298 inside as GCC does */
4299 block(NULL
, NULL
, 1);
4314 /* functions names must be treated as function pointers,
4315 except for unary '&' and sizeof. Since we consider that
4316 functions are not lvalues, we only have to handle it
4317 there and in function calls. */
4318 /* arrays can also be used although they are not lvalues */
4319 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
&&
4320 !(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_LLOCAL
))
4322 mk_pointer(&vtop
->type
);
4328 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
4330 boolean
.t
= VT_BOOL
;
4332 vtop
->c
.i
= !vtop
->c
.i
;
4333 } else if ((vtop
->r
& VT_VALMASK
) == VT_CMP
)
4337 vseti(VT_JMP
, gvtst(1, 0));
4349 if ((vtop
->type
.t
& VT_BTYPE
) == VT_PTR
)
4350 tcc_error("pointer not accepted for unary plus");
4351 /* In order to force cast, we add zero, except for floating point
4352 where we really need an noop (otherwise -0.0 will be transformed
4354 if (!is_float(vtop
->type
.t
)) {
4365 unary_type(&type
); // Perform a in_sizeof = 0;
4366 size
= type_size(&type
, &align
);
4367 if (t
== TOK_SIZEOF
) {
4368 if (!(type
.t
& VT_VLA
)) {
4370 tcc_error("sizeof applied to an incomplete type");
4373 vla_runtime_type_size(&type
, &align
);
4378 vtop
->type
.t
|= VT_UNSIGNED
;
4381 case TOK_builtin_expect
:
4383 /* __builtin_expect is a no-op for now */
4384 int saved_nocode_wanted
;
4389 saved_nocode_wanted
= nocode_wanted
;
4393 nocode_wanted
= saved_nocode_wanted
;
4397 case TOK_builtin_types_compatible_p
:
4406 type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
4407 type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
4408 vpushi(is_compatible_types(&type1
, &type2
));
4411 case TOK_builtin_choose_expr
:
4413 int saved_nocode_wanted
;
4420 saved_nocode_wanted
= nocode_wanted
;
4426 nocode_wanted
= saved_nocode_wanted
;
4430 saved_nocode_wanted
= nocode_wanted
;
4436 nocode_wanted
= saved_nocode_wanted
;
4441 case TOK_builtin_constant_p
:
4443 int saved_nocode_wanted
, res
;
4446 saved_nocode_wanted
= nocode_wanted
;
4449 res
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
4451 nocode_wanted
= saved_nocode_wanted
;
4456 case TOK_builtin_frame_address
:
4457 case TOK_builtin_return_address
:
4464 if (tok
!= TOK_CINT
) {
4465 tcc_error("%s only takes positive integers",
4466 tok1
== TOK_builtin_return_address
?
4467 "__builtin_return_address" :
4468 "__builtin_frame_address");
4470 level
= (uint32_t)tokc
.i
;
4475 vset(&type
, VT_LOCAL
, 0); /* local frame */
4477 mk_pointer(&vtop
->type
);
4478 indir(); /* -> parent frame */
4480 if (tok1
== TOK_builtin_return_address
) {
4481 // assume return address is just above frame pointer on stack
4484 mk_pointer(&vtop
->type
);
4489 #ifdef TCC_TARGET_X86_64
4490 #ifdef TCC_TARGET_PE
4491 case TOK_builtin_va_start
:
4499 if ((vtop
->r
& VT_VALMASK
) != VT_LOCAL
)
4500 tcc_error("__builtin_va_start expects a local variable");
4501 vtop
->r
&= ~(VT_LVAL
| VT_REF
);
4502 vtop
->type
= char_pointer_type
;
4508 case TOK_builtin_va_arg_types
:
4515 vpushi(classify_x86_64_va_arg(&type
));
4521 #ifdef TCC_TARGET_ARM64
4522 case TOK___va_start
: {
4524 tcc_error("statement in global scope");
4534 vtop
->type
.t
= VT_VOID
;
4537 case TOK___va_arg
: {
4540 tcc_error("statement in global scope");
4552 case TOK___arm64_clear_cache
: {
4561 vtop
->type
.t
= VT_VOID
;
4565 /* pre operations */
4576 t
= vtop
->type
.t
& VT_BTYPE
;
4578 /* In IEEE negate(x) isn't subtract(0,x), but rather
4583 else if (t
== VT_DOUBLE
)
4594 goto tok_identifier
;
4596 /* allow to take the address of a label */
4597 if (tok
< TOK_UIDENT
)
4598 expect("label identifier");
4599 s
= label_find(tok
);
4601 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
4603 if (s
->r
== LABEL_DECLARED
)
4604 s
->r
= LABEL_FORWARD
;
4607 s
->type
.t
= VT_VOID
;
4608 mk_pointer(&s
->type
);
4609 s
->type
.t
|= VT_STATIC
;
4611 vpushsym(&s
->type
, s
);
4615 // special qnan , snan and infinity values
4617 vpush64(VT_DOUBLE
, 0x7ff8000000000000ULL
);
4621 vpush64(VT_DOUBLE
, 0x7ff0000000000001ULL
);
4625 vpush64(VT_DOUBLE
, 0x7ff0000000000000ULL
);
4634 expect("identifier");
4637 const char *name
= get_tok_str(t
, NULL
);
4639 tcc_error("'%s' undeclared", name
);
4640 /* for simple function calls, we tolerate undeclared
4641 external reference to int() function */
4642 if (tcc_state
->warn_implicit_function_declaration
4643 #ifdef TCC_TARGET_PE
4644 /* people must be warned about using undeclared WINAPI functions
4645 (which usually start with uppercase letter) */
4646 || (name
[0] >= 'A' && name
[0] <= 'Z')
4649 tcc_warning("implicit declaration of function '%s'", name
);
4650 s
= external_global_sym(t
, &func_old_type
, 0);
4652 if ((s
->type
.t
& (VT_STATIC
| VT_INLINE
| VT_BTYPE
)) ==
4653 (VT_STATIC
| VT_INLINE
| VT_FUNC
)) {
4654 /* if referencing an inline function, then we generate a
4655 symbol to it if not already done. It will have the
4656 effect to generate code for it at the end of the
4657 compilation unit. Inline function as always
4658 generated in the text section. */
4659 if (!s
->c
&& !nocode_wanted
)
4660 put_extern_sym(s
, text_section
, 0, 0);
4661 r
= VT_SYM
| VT_CONST
;
4664 /* A symbol that has a register is a local register variable,
4665 which starts out as VT_LOCAL value. */
4666 if ((r
& VT_VALMASK
) < VT_CONST
)
4667 r
= (r
& ~VT_VALMASK
) | VT_LOCAL
;
4669 vset(&s
->type
, r
, s
->c
);
4670 /* Point to s as backpointer (even without r&VT_SYM).
4671 Will be used by at least the x86 inline asm parser for
4674 if (vtop
->r
& VT_SYM
) {
4680 /* post operations */
4682 if (tok
== TOK_INC
|| tok
== TOK_DEC
) {
4685 } else if (tok
== '.' || tok
== TOK_ARROW
|| tok
== TOK_CDOUBLE
) {
4688 if (tok
== TOK_ARROW
)
4690 qualifiers
= vtop
->type
.t
& (VT_CONSTANT
| VT_VOLATILE
);
4693 /* expect pointer on structure */
4694 if ((vtop
->type
.t
& VT_BTYPE
) != VT_STRUCT
)
4695 expect("struct or union");
4696 if (tok
== TOK_CDOUBLE
)
4697 expect("field name");
4699 if (tok
== TOK_CINT
|| tok
== TOK_CUINT
)
4700 expect("field name");
4701 s
= find_field(&vtop
->type
, tok
);
4703 tcc_error("field not found: %s", get_tok_str(tok
& ~SYM_FIELD
, &tokc
));
4704 /* add field offset to pointer */
4705 vtop
->type
= char_pointer_type
; /* change type to 'char *' */
4708 /* change type to field type, and set to lvalue */
4709 vtop
->type
= s
->type
;
4710 vtop
->type
.t
|= qualifiers
;
4711 /* an array is never an lvalue */
4712 if (!(vtop
->type
.t
& VT_ARRAY
)) {
4713 vtop
->r
|= lvalue_type(vtop
->type
.t
);
4714 #ifdef CONFIG_TCC_BCHECK
4715 /* if bound checking, the referenced pointer must be checked */
4716 if (tcc_state
->do_bounds_check
&& (vtop
->r
& VT_VALMASK
) != VT_LOCAL
)
4717 vtop
->r
|= VT_MUSTBOUND
;
4721 } else if (tok
== '[') {
4727 } else if (tok
== '(') {
4730 int nb_args
, ret_nregs
, ret_align
, regsize
, variadic
;
4733 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
4734 /* pointer test (no array accepted) */
4735 if ((vtop
->type
.t
& (VT_BTYPE
| VT_ARRAY
)) == VT_PTR
) {
4736 vtop
->type
= *pointed_type(&vtop
->type
);
4737 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
)
4741 expect("function pointer");
4744 vtop
->r
&= ~VT_LVAL
; /* no lvalue */
4746 /* get return type */
4749 sa
= s
->next
; /* first parameter */
4752 /* compute first implicit argument if a structure is returned */
4753 if ((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
4754 variadic
= (s
->c
== FUNC_ELLIPSIS
);
4755 ret_nregs
= gfunc_sret(&s
->type
, variadic
, &ret
.type
,
4756 &ret_align
, ®size
);
4758 /* get some space for the returned structure */
4759 size
= type_size(&s
->type
, &align
);
4760 #ifdef TCC_TARGET_ARM64
4761 /* On arm64, a small struct is return in registers.
4762 It is much easier to write it to memory if we know
4763 that we are allowed to write some extra bytes, so
4764 round the allocated space up to a power of 2: */
4766 while (size
& (size
- 1))
4767 size
= (size
| (size
- 1)) + 1;
4769 loc
= (loc
- size
) & -align
;
4771 ret
.r
= VT_LOCAL
| VT_LVAL
;
4772 /* pass it as 'int' to avoid structure arg passing
4774 vseti(VT_LOCAL
, loc
);
4784 /* return in register */
4785 if (is_float(ret
.type
.t
)) {
4786 ret
.r
= reg_fret(ret
.type
.t
);
4787 #ifdef TCC_TARGET_X86_64
4788 if ((ret
.type
.t
& VT_BTYPE
) == VT_QFLOAT
)
4792 #ifndef TCC_TARGET_ARM64
4793 #ifdef TCC_TARGET_X86_64
4794 if ((ret
.type
.t
& VT_BTYPE
) == VT_QLONG
)
4796 if ((ret
.type
.t
& VT_BTYPE
) == VT_LLONG
)
4807 gfunc_param_typed(s
, sa
);
4817 tcc_error("too few arguments to function");
4819 if (!nocode_wanted
) {
4820 gfunc_call(nb_args
);
4822 vtop
-= (nb_args
+ 1);
4826 for (r
= ret
.r
+ ret_nregs
+ !ret_nregs
; r
-- > ret
.r
;) {
4827 vsetc(&ret
.type
, r
, &ret
.c
);
4828 vtop
->r2
= ret
.r2
; /* Loop only happens when r2 is VT_CONST */
4831 /* handle packed struct return */
4832 if (((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) && ret_nregs
) {
4835 size
= type_size(&s
->type
, &align
);
4836 /* We're writing whole regs often, make sure there's enough
4837 space. Assume register size is power of 2. */
4838 if (regsize
> align
)
4840 loc
= (loc
- size
) & -align
;
4844 vset(&ret
.type
, VT_LOCAL
| VT_LVAL
, addr
+ offset
);
4848 if (--ret_nregs
== 0)
4852 vset(&s
->type
, VT_LOCAL
| VT_LVAL
, addr
);
4860 ST_FUNC
void expr_prod(void)
4865 while (tok
== '*' || tok
== '/' || tok
== '%') {
4873 ST_FUNC
void expr_sum(void)
4878 while (tok
== '+' || tok
== '-') {
4886 static void expr_shift(void)
4891 while (tok
== TOK_SHL
|| tok
== TOK_SAR
) {
4899 static void expr_cmp(void)
4904 while ((tok
>= TOK_ULE
&& tok
<= TOK_GT
) ||
4905 tok
== TOK_ULT
|| tok
== TOK_UGE
) {
4913 static void expr_cmpeq(void)
4918 while (tok
== TOK_EQ
|| tok
== TOK_NE
) {
4926 static void expr_and(void)
4929 while (tok
== '&') {
4936 static void expr_xor(void)
4939 while (tok
== '^') {
4946 static void expr_or(void)
4949 while (tok
== '|') {
4956 /* XXX: fix this mess */
4957 static void expr_land_const(void)
4960 while (tok
== TOK_LAND
) {
4966 static void expr_lor_const(void)
4969 while (tok
== TOK_LOR
) {
4976 static void expr_land(void)
4979 if (tok
== TOK_LAND
) {
4982 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
4989 int saved_nocode_wanted
= nocode_wanted
;
4991 while (tok
== TOK_LAND
) {
4998 nocode_wanted
= saved_nocode_wanted
;
4999 gen_cast(&int_type
);
5007 if (tok
!= TOK_LAND
) {
5020 static void expr_lor(void)
5023 if (tok
== TOK_LOR
) {
5026 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
5033 int saved_nocode_wanted
= nocode_wanted
;
5035 while (tok
== TOK_LOR
) {
5042 nocode_wanted
= saved_nocode_wanted
;
5043 gen_cast(&int_type
);
5051 if (tok
!= TOK_LOR
) {
5064 /* Assuming vtop is a value used in a conditional context
5065 (i.e. compared with zero) return 0 if it's false, 1 if
5066 true and -1 if it can't be statically determined. */
5067 static int condition_3way(void)
5070 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
&&
5071 (!(vtop
->r
& VT_SYM
) ||
5072 !(vtop
->sym
->type
.t
& VT_WEAK
))) {
5074 boolean
.t
= VT_BOOL
;
5083 static void expr_cond(void)
5085 int tt
, u
, r1
, r2
, rc
, t1
, t2
, bt1
, bt2
, islv
;
5088 CType type
, type1
, type2
;
5093 c
= condition_3way();
5095 int saved_nocode_wanted
= nocode_wanted
;
5097 if (tok
!= ':' || !gnu_ext
) {
5105 nocode_wanted
= saved_nocode_wanted
;
5108 if (tok
!= ':' || !gnu_ext
) {
5112 nocode_wanted
= saved_nocode_wanted
;
5119 /* XXX This doesn't handle nocode_wanted correctly at all.
5120 It unconditionally calls gv/gvtst and friends. That's
5121 the case for many of the expr_ routines. Currently
5122 that should generate only useless code, but depending
5123 on other operand handling this might also generate
5124 pointer derefs for lvalue conversions whose result
5125 is useless, but nevertheless can lead to segfault.
5127 Somewhen we need to overhaul the whole nocode_wanted
5129 if (vtop
!= vstack
) {
5130 /* needed to avoid having different registers saved in
5132 if (is_float(vtop
->type
.t
)) {
5134 #ifdef TCC_TARGET_X86_64
5135 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
5145 if (tok
== ':' && gnu_ext
) {
5153 sv
= *vtop
; /* save value to handle it later */
5154 vtop
--; /* no vpop so that FP stack is not flushed */
5162 bt1
= t1
& VT_BTYPE
;
5164 bt2
= t2
& VT_BTYPE
;
5165 /* cast operands to correct type according to ISOC rules */
5166 if (is_float(bt1
) || is_float(bt2
)) {
5167 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
5168 type
.t
= VT_LDOUBLE
;
5169 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
5174 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
5175 /* cast to biggest op */
5177 /* convert to unsigned if it does not fit in a long long */
5178 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
5179 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
5180 type
.t
|= VT_UNSIGNED
;
5181 } else if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
5182 /* If one is a null ptr constant the result type
5184 if (is_null_pointer (vtop
))
5186 else if (is_null_pointer (&sv
))
5188 /* XXX: test pointer compatibility, C99 has more elaborate
5192 } else if (bt1
== VT_FUNC
|| bt2
== VT_FUNC
) {
5193 /* XXX: test function pointer compatibility */
5194 type
= bt1
== VT_FUNC
? type1
: type2
;
5195 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
5196 /* XXX: test structure compatibility */
5197 type
= bt1
== VT_STRUCT
? type1
: type2
;
5198 } else if (bt1
== VT_VOID
|| bt2
== VT_VOID
) {
5199 /* NOTE: as an extension, we accept void on only one side */
5202 /* integer operations */
5204 /* convert to unsigned if it does not fit in an integer */
5205 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
5206 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
5207 type
.t
|= VT_UNSIGNED
;
5209 /* keep structs lvalue by transforming `(expr ? a : b)` to `*(expr ? &a : &b)` so
5210 that `(expr ? a : b).mem` does not error with "lvalue expected" */
5211 islv
= (vtop
->r
& VT_LVAL
) && (sv
.r
& VT_LVAL
) && VT_STRUCT
== (type
.t
& VT_BTYPE
);
5213 /* now we convert second operand */
5216 mk_pointer(&vtop
->type
);
5219 else if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
5222 if (is_float(type
.t
)) {
5224 #ifdef TCC_TARGET_X86_64
5225 if ((type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
5229 } else if ((type
.t
& VT_BTYPE
) == VT_LLONG
) {
5230 /* for long longs, we use fixed registers to avoid having
5231 to handle a complicated move */
5236 /* this is horrible, but we must also convert first
5240 /* put again first value and cast it */
5244 mk_pointer(&vtop
->type
);
5247 else if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
5250 move_reg(r2
, r1
, type
.t
);
5259 static void expr_eq(void)
5265 (tok
>= TOK_A_MOD
&& tok
<= TOK_A_DIV
) ||
5266 tok
== TOK_A_XOR
|| tok
== TOK_A_OR
||
5267 tok
== TOK_A_SHL
|| tok
== TOK_A_SAR
) {
5282 ST_FUNC
void gexpr(void)
5293 /* parse an expression and return its type without any side effect. */
5294 static void expr_type(CType
*type
)
5296 int saved_nocode_wanted
;
5298 saved_nocode_wanted
= nocode_wanted
;
5303 nocode_wanted
= saved_nocode_wanted
;
5306 /* parse a unary expression and return its type without any side
5308 static void unary_type(CType
*type
)
5320 /* parse a constant expression and return value in vtop. */
5321 static void expr_const1(void)
5330 /* parse an integer constant and return its value. */
5331 static inline int64_t expr_const64(void)
5335 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
5336 expect("constant expression");
5342 /* parse an integer constant and return its value.
5343 Complain if it doesn't fit 32bit (signed or unsigned). */
5344 ST_FUNC
int expr_const(void)
5347 int64_t wc
= expr_const64();
5349 if (c
!= wc
&& (unsigned)c
!= wc
)
5350 tcc_error("constant exceeds 32 bit");
5354 /* return the label token if current token is a label, otherwise
5356 static int is_label(void)
5360 /* fast test first */
5361 if (tok
< TOK_UIDENT
)
5363 /* no need to save tokc because tok is an identifier */
5370 unget_tok(last_tok
);
5375 static void label_or_decl(int l
)
5379 /* fast test first */
5380 if (tok
>= TOK_UIDENT
)
5382 /* no need to save tokc because tok is an identifier */
5386 unget_tok(last_tok
);
5389 unget_tok(last_tok
);
5394 static int case_cmp(const void *pa
, const void *pb
)
5396 int64_t a
= (*(struct case_t
**) pa
)->v1
;
5397 int64_t b
= (*(struct case_t
**) pb
)->v1
;
5398 return a
< b
? -1 : a
> b
;
5401 static void gcase(struct case_t
**base
, int len
, int *bsym
)
5405 int ll
= (vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
;
5423 gtst_addr(0, p
->sym
); /* v1 <= x <= v2 */
5425 gcase(base
, len
/2, bsym
);
5426 if (cur_switch
->def_sym
)
5427 gjmp_addr(cur_switch
->def_sym
);
5429 *bsym
= gjmp(*bsym
);
5433 base
+= e
; len
-= e
;
5443 if (p
->v1
== p
->v2
) {
5445 gtst_addr(0, p
->sym
);
5455 gtst_addr(0, p
->sym
);
5461 static void block(int *bsym
, int *csym
, int is_expr
)
5463 int a
, b
, c
, d
, cond
;
5466 /* generate line number info */
5467 if (tcc_state
->do_debug
&&
5468 (last_line_num
!= file
->line_num
|| last_ind
!= ind
)) {
5469 put_stabn(N_SLINE
, 0, file
->line_num
, ind
- func_ind
);
5471 last_line_num
= file
->line_num
;
5475 /* default return value is (void) */
5477 vtop
->type
.t
= VT_VOID
;
5480 if (tok
== TOK_IF
) {
5482 int saved_nocode_wanted
= nocode_wanted
;
5487 cond
= condition_3way();
5491 block(bsym
, csym
, 0);
5493 nocode_wanted
= saved_nocode_wanted
;
5495 if (c
== TOK_ELSE
) {
5501 block(bsym
, csym
, 0);
5502 gsym(d
); /* patch else jmp */
5504 nocode_wanted
= saved_nocode_wanted
;
5507 } else if (tok
== TOK_WHILE
) {
5508 int saved_nocode_wanted
;
5509 nocode_wanted
&= ~2;
5519 saved_nocode_wanted
= nocode_wanted
;
5521 nocode_wanted
= saved_nocode_wanted
;
5527 } else if (tok
== '{') {
5529 int block_vla_sp_loc
= vla_sp_loc
, saved_vlas_in_scope
= vlas_in_scope
;
5532 /* record local declaration stack position */
5534 llabel
= local_label_stack
;
5537 /* handle local labels declarations */
5538 if (tok
== TOK_LABEL
) {
5541 if (tok
< TOK_UIDENT
)
5542 expect("label identifier");
5543 label_push(&local_label_stack
, tok
, LABEL_DECLARED
);
5553 while (tok
!= '}') {
5554 label_or_decl(VT_LOCAL
);
5558 block(bsym
, csym
, is_expr
);
5561 /* pop locally defined labels */
5562 label_pop(&local_label_stack
, llabel
);
5563 /* pop locally defined symbols */
5565 /* In the is_expr case (a statement expression is finished here),
5566 vtop might refer to symbols on the local_stack. Either via the
5567 type or via vtop->sym. We can't pop those nor any that in turn
5568 might be referred to. To make it easier we don't roll back
5569 any symbols in that case; some upper level call to block() will
5570 do that. We do have to remove such symbols from the lookup
5571 tables, though. sym_pop will do that. */
5572 sym_pop(&local_stack
, s
, is_expr
);
5574 /* Pop VLA frames and restore stack pointer if required */
5575 if (vlas_in_scope
> saved_vlas_in_scope
) {
5576 vla_sp_loc
= saved_vlas_in_scope
? block_vla_sp_loc
: vla_sp_root_loc
;
5579 vlas_in_scope
= saved_vlas_in_scope
;
5582 } else if (tok
== TOK_RETURN
) {
5586 gen_assign_cast(&func_vt
);
5587 #ifdef TCC_TARGET_ARM64
5588 // Perhaps it would be better to use this for all backends:
5591 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
5592 CType type
, ret_type
;
5593 int ret_align
, ret_nregs
, regsize
;
5594 ret_nregs
= gfunc_sret(&func_vt
, func_var
, &ret_type
,
5595 &ret_align
, ®size
);
5596 if (0 == ret_nregs
) {
5597 /* if returning structure, must copy it to implicit
5598 first pointer arg location */
5601 vset(&type
, VT_LOCAL
| VT_LVAL
, func_vc
);
5604 /* copy structure value to pointer */
5607 /* returning structure packed into registers */
5608 int r
, size
, addr
, align
;
5609 size
= type_size(&func_vt
,&align
);
5610 if ((vtop
->r
!= (VT_LOCAL
| VT_LVAL
) ||
5611 (vtop
->c
.i
& (ret_align
-1)))
5612 && (align
& (ret_align
-1))) {
5613 loc
= (loc
- size
) & -ret_align
;
5616 vset(&type
, VT_LOCAL
| VT_LVAL
, addr
);
5620 vset(&ret_type
, VT_LOCAL
| VT_LVAL
, addr
);
5622 vtop
->type
= ret_type
;
5623 if (is_float(ret_type
.t
))
5624 r
= rc_fret(ret_type
.t
);
5635 if (--ret_nregs
== 0)
5637 /* We assume that when a structure is returned in multiple
5638 registers, their classes are consecutive values of the
5641 vtop
->c
.i
+= regsize
;
5645 } else if (is_float(func_vt
.t
)) {
5646 gv(rc_fret(func_vt
.t
));
5651 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
5654 /* jump unless last stmt in top-level block */
5655 if (tok
!= '}' || local_scope
!= 1)
5658 } else if (tok
== TOK_BREAK
) {
5661 tcc_error("cannot break");
5662 *bsym
= gjmp(*bsym
);
5666 } else if (tok
== TOK_CONTINUE
) {
5669 tcc_error("cannot continue");
5670 vla_sp_restore_root();
5671 *csym
= gjmp(*csym
);
5674 } else if (tok
== TOK_FOR
) {
5676 int saved_nocode_wanted
;
5677 nocode_wanted
&= ~2;
5683 /* c99 for-loop init decl? */
5684 if (!decl0(VT_LOCAL
, 1)) {
5685 /* no, regular for-loop init expr */
5711 saved_nocode_wanted
= nocode_wanted
;
5713 nocode_wanted
= saved_nocode_wanted
;
5719 sym_pop(&local_stack
, s
, 0);
5722 if (tok
== TOK_DO
) {
5723 int saved_nocode_wanted
;
5724 nocode_wanted
&= ~2;
5730 saved_nocode_wanted
= nocode_wanted
;
5732 nocode_wanted
= saved_nocode_wanted
;
5744 if (tok
== TOK_SWITCH
) {
5745 struct switch_t
*saved
, sw
;
5746 int saved_nocode_wanted
= nocode_wanted
;
5752 switchval
= *vtop
--;
5754 b
= gjmp(0); /* jump to first case */
5755 sw
.p
= NULL
; sw
.n
= 0; sw
.def_sym
= 0;
5759 nocode_wanted
= saved_nocode_wanted
;
5760 a
= gjmp(a
); /* add implicit break */
5763 if (!nocode_wanted
) {
5764 qsort(sw
.p
, sw
.n
, sizeof(void*), case_cmp
);
5765 for (b
= 1; b
< sw
.n
; b
++)
5766 if (sw
.p
[b
- 1]->v2
>= sw
.p
[b
]->v1
)
5767 tcc_error("duplicate case value");
5768 /* Our switch table sorting is signed, so the compared
5769 value needs to be as well when it's 64bit. */
5770 if ((switchval
.type
.t
& VT_BTYPE
) == VT_LLONG
)
5771 switchval
.type
.t
&= ~VT_UNSIGNED
;
5773 gcase(sw
.p
, sw
.n
, &a
);
5776 gjmp_addr(sw
.def_sym
);
5778 dynarray_reset(&sw
.p
, &sw
.n
);
5783 if (tok
== TOK_CASE
) {
5784 struct case_t
*cr
= tcc_malloc(sizeof(struct case_t
));
5787 nocode_wanted
&= ~2;
5789 cr
->v1
= cr
->v2
= expr_const64();
5790 if (gnu_ext
&& tok
== TOK_DOTS
) {
5792 cr
->v2
= expr_const64();
5793 if (cr
->v2
< cr
->v1
)
5794 tcc_warning("empty case range");
5797 dynarray_add((void***) &cur_switch
->p
, &cur_switch
->n
, cr
);
5800 goto block_after_label
;
5802 if (tok
== TOK_DEFAULT
) {
5807 if (cur_switch
->def_sym
)
5808 tcc_error("too many 'default'");
5809 cur_switch
->def_sym
= ind
;
5811 goto block_after_label
;
5813 if (tok
== TOK_GOTO
) {
5815 if (tok
== '*' && gnu_ext
) {
5819 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
)
5825 } else if (tok
>= TOK_UIDENT
) {
5826 s
= label_find(tok
);
5827 /* put forward definition if needed */
5829 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
5831 if (s
->r
== LABEL_DECLARED
)
5832 s
->r
= LABEL_FORWARD
;
5834 vla_sp_restore_root();
5837 else if (s
->r
& LABEL_FORWARD
)
5838 s
->jnext
= gjmp(s
->jnext
);
5840 gjmp_addr(s
->jnext
);
5843 expect("label identifier");
5846 } else if (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
) {
5854 if (s
->r
== LABEL_DEFINED
)
5855 tcc_error("duplicate label '%s'", get_tok_str(s
->v
, NULL
));
5857 s
->r
= LABEL_DEFINED
;
5859 s
= label_push(&global_label_stack
, b
, LABEL_DEFINED
);
5863 /* we accept this, but it is a mistake */
5865 nocode_wanted
&= ~2;
5867 tcc_warning("deprecated use of label at end of compound statement");
5871 block(bsym
, csym
, is_expr
);
5874 /* expression case */
5889 #define EXPR_CONST 1
5892 static void parse_init_elem(int expr_type
)
5894 int saved_global_expr
;
5897 /* compound literals must be allocated globally in this case */
5898 saved_global_expr
= global_expr
;
5901 global_expr
= saved_global_expr
;
5902 /* NOTE: symbols are accepted */
5903 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) != VT_CONST
)
5904 tcc_error("initializer element is not constant");
5912 /* t is the array or struct type. c is the array or struct
5913 address. cur_field is the pointer to the current
5914 value, for arrays the 'c' member contains the current start
5915 index and the 'r' contains the end index (in case of range init).
5916 'size_only' is true if only size info is needed (only used
5918 static void decl_designator(CType
*type
, Section
*sec
, unsigned long c
,
5919 Sym
**cur_field
, int size_only
)
5922 int notfirst
, index
, index_last
, align
, l
, nb_elems
, elem_size
;
5928 if (gnu_ext
&& (l
= is_label()) != 0)
5930 while (tok
== '[' || tok
== '.') {
5932 if (!(type
->t
& VT_ARRAY
))
5933 expect("array type");
5936 index
= expr_const();
5937 if (index
< 0 || (s
->c
>= 0 && index
>= s
->c
))
5938 tcc_error("invalid index");
5939 if (tok
== TOK_DOTS
&& gnu_ext
) {
5941 index_last
= expr_const();
5942 if (index_last
< 0 ||
5943 (s
->c
>= 0 && index_last
>= s
->c
) ||
5945 tcc_error("invalid index");
5951 (*cur_field
)->c
= index
;
5952 (*cur_field
)->r
= index_last
;
5954 type
= pointed_type(type
);
5955 elem_size
= type_size(type
, &align
);
5956 c
+= index
* elem_size
;
5957 /* NOTE: we only support ranges for last designator */
5958 nb_elems
= index_last
- index
+ 1;
5959 if (nb_elems
!= 1) {
5968 if ((type
->t
& VT_BTYPE
) != VT_STRUCT
)
5969 expect("struct/union type");
5970 f
= find_field(type
, l
);
5975 /* XXX: fix this mess by using explicit storage field */
5977 type1
.t
|= (type
->t
& ~VT_TYPE
);
5991 if (type
->t
& VT_ARRAY
) {
5992 index
= (*cur_field
)->c
;
5993 if (type
->ref
->c
>= 0 && index
>= type
->ref
->c
)
5994 tcc_error("index too large");
5995 type
= pointed_type(type
);
5996 c
+= index
* type_size(type
, &align
);
6000 tcc_error("too many field init");
6001 /* XXX: fix this mess by using explicit storage field */
6003 type1
.t
|= (type
->t
& ~VT_TYPE
);
6008 decl_initializer(type
, sec
, c
, 0, size_only
);
6010 /* XXX: make it more general */
6011 if (!size_only
&& nb_elems
> 1) {
6012 unsigned long c_end
;
6017 vset(type
, VT_LOCAL
|VT_LVAL
, c
);
6018 for (i
= 1; i
< nb_elems
; i
++) {
6019 vset(type
, VT_LOCAL
|VT_LVAL
, c
+ elem_size
* i
);
6025 c_end
= c
+ nb_elems
* elem_size
;
6026 if (c_end
> sec
->data_allocated
)
6027 section_realloc(sec
, c_end
);
6028 src
= sec
->data
+ c
;
6030 for(i
= 1; i
< nb_elems
; i
++) {
6032 memcpy(dst
, src
, elem_size
);
6038 /* store a value or an expression directly in global data or in local array */
6039 static void init_putv(CType
*type
, Section
*sec
, unsigned long c
)
6041 int bt
, bit_pos
, bit_size
;
6043 unsigned long long bit_mask
;
6047 dtype
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
6051 /* XXX: not portable */
6052 /* XXX: generate error if incorrect relocation */
6053 gen_assign_cast(&dtype
);
6054 bt
= type
->t
& VT_BTYPE
;
6055 size
= type_size(type
, &align
);
6056 if (c
+ size
> sec
->data_allocated
) {
6057 section_realloc(sec
, c
+ size
);
6059 ptr
= sec
->data
+ c
;
6060 /* XXX: make code faster ? */
6061 if (!(type
->t
& VT_BITFIELD
)) {
6063 bit_size
= PTR_SIZE
* 8;
6066 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
6067 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
6068 bit_mask
= (1LL << bit_size
) - 1;
6070 if ((vtop
->r
& (VT_SYM
|VT_CONST
)) == (VT_SYM
|VT_CONST
) &&
6071 vtop
->sym
->v
>= SYM_FIRST_ANOM
&&
6072 /* XXX This rejects compount literals like
6073 '(void *){ptr}'. The problem is that '&sym' is
6074 represented the same way, which would be ruled out
6075 by the SYM_FIRST_ANOM check above, but also '"string"'
6076 in 'char *p = "string"' is represented the same
6077 with the type being VT_PTR and the symbol being an
6078 anonymous one. That is, there's no difference in vtop
6079 between '(void *){x}' and '&(void *){x}'. Ignore
6080 pointer typed entities here. Hopefully no real code
6081 will every use compound literals with scalar type. */
6082 (vtop
->type
.t
& VT_BTYPE
) != VT_PTR
) {
6083 /* These come from compound literals, memcpy stuff over. */
6087 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[vtop
->sym
->c
];
6088 ssec
= tcc_state
->sections
[esym
->st_shndx
];
6089 memmove (ptr
, ssec
->data
+ esym
->st_value
, size
);
6091 /* We need to copy over all memory contents, and that
6092 includes relocations. Use the fact that relocs are
6093 created it order, so look from the end of relocs
6094 until we hit one before the copied region. */
6095 int num_relocs
= ssec
->reloc
->data_offset
/ sizeof(*rel
);
6096 rel
= (ElfW_Rel
*)(ssec
->reloc
->data
+ ssec
->reloc
->data_offset
);
6097 while (num_relocs
--) {
6099 if (rel
->r_offset
>= esym
->st_value
+ size
)
6101 if (rel
->r_offset
< esym
->st_value
)
6103 /* Note: if the same fields are initialized multiple
6104 times (possible with designators) then we possibly
6105 add multiple relocations for the same offset here.
6106 That would lead to wrong code, the last reloc needs
6107 to win. We clean this up later after the whole
6108 initializer is parsed. */
6109 put_elf_reloca(symtab_section
, sec
,
6110 c
+ rel
->r_offset
- esym
->st_value
,
6111 ELFW(R_TYPE
)(rel
->r_info
),
6112 ELFW(R_SYM
)(rel
->r_info
),
6113 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
6122 if ((vtop
->r
& VT_SYM
) &&
6128 (bt
== VT_LLONG
&& bit_size
!= 64) ||
6132 (bt
== VT_INT
&& bit_size
!= 32)
6135 tcc_error("initializer element is not computable at load time");
6137 /* XXX: when cross-compiling we assume that each type has the
6138 same representation on host and target, which is likely to
6139 be wrong in the case of long double */
6141 vtop
->c
.i
= (vtop
->c
.i
!= 0);
6143 *(char *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
6146 *(short *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
6149 *(double *)ptr
= vtop
->c
.d
;
6152 if (sizeof(long double) == LDOUBLE_SIZE
)
6153 *(long double *)ptr
= vtop
->c
.ld
;
6154 else if (sizeof(double) == LDOUBLE_SIZE
)
6155 *(double *)ptr
= vtop
->c
.ld
;
6157 tcc_error("can't cross compile long double constants");
6161 *(long long *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
6168 addr_t val
= (vtop
->c
.i
& bit_mask
) << bit_pos
;
6169 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
6170 if (vtop
->r
& VT_SYM
)
6171 greloca(sec
, vtop
->sym
, c
, R_DATA_PTR
, val
);
6173 *(addr_t
*)ptr
|= val
;
6175 if (vtop
->r
& VT_SYM
)
6176 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
6177 *(addr_t
*)ptr
|= val
;
6183 int val
= (vtop
->c
.i
& bit_mask
) << bit_pos
;
6184 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
6185 if (vtop
->r
& VT_SYM
)
6186 greloca(sec
, vtop
->sym
, c
, R_DATA_PTR
, val
);
6190 if (vtop
->r
& VT_SYM
)
6191 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
6200 vset(&dtype
, VT_LOCAL
|VT_LVAL
, c
);
6207 /* put zeros for variable based init */
6208 static void init_putz(Section
*sec
, unsigned long c
, int size
)
6211 /* nothing to do because globals are already set to zero */
6213 vpush_global_sym(&func_old_type
, TOK_memset
);
6215 #ifdef TCC_TARGET_ARM
6226 /* 't' contains the type and storage info. 'c' is the offset of the
6227 object in section 'sec'. If 'sec' is NULL, it means stack based
6228 allocation. 'first' is true if array '{' must be read (multi
6229 dimension implicit array init handling). 'size_only' is true if
6230 size only evaluation is wanted (only for arrays). */
6231 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
,
6232 int first
, int size_only
)
6234 int index
, array_length
, n
, no_oblock
, nb
, parlevel
, parlevel1
, i
;
6241 /* If we currently are at an '}' or ',' we have read an initializer
6242 element in one of our callers, and not yet consumed it. */
6243 have_elem
= tok
== '}' || tok
== ',';
6244 if (!have_elem
&& tok
!= '{' &&
6245 /* In case of strings we have special handling for arrays, so
6246 don't consume them as initializer value (which would commit them
6247 to some anonymous symbol). */
6248 tok
!= TOK_LSTR
&& tok
!= TOK_STR
&&
6250 parse_init_elem(!sec
? EXPR_ANY
: EXPR_CONST
);
6255 !(type
->t
& VT_ARRAY
) &&
6256 /* Use i_c_parameter_t, to strip toplevel qualifiers.
6257 The source type might have VT_CONSTANT set, which is
6258 of course assignable to non-const elements. */
6259 is_compatible_parameter_types(type
, &vtop
->type
)) {
6260 init_putv(type
, sec
, c
);
6261 } else if (type
->t
& VT_ARRAY
) {
6265 t1
= pointed_type(type
);
6266 size1
= type_size(t1
, &align1
);
6269 if ((first
&& tok
!= TOK_LSTR
&& tok
!= TOK_STR
) ||
6272 tcc_error("character array initializer must be a literal,"
6273 " optionally enclosed in braces");
6278 /* only parse strings here if correct type (otherwise: handle
6279 them as ((w)char *) expressions */
6280 if ((tok
== TOK_LSTR
&&
6281 #ifdef TCC_TARGET_PE
6282 (t1
->t
& VT_BTYPE
) == VT_SHORT
&& (t1
->t
& VT_UNSIGNED
)
6284 (t1
->t
& VT_BTYPE
) == VT_INT
6286 ) || (tok
== TOK_STR
&& (t1
->t
& VT_BTYPE
) == VT_BYTE
)) {
6287 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
6290 /* compute maximum number of chars wanted */
6292 cstr_len
= tokc
.str
.size
;
6294 cstr_len
= tokc
.str
.size
/ sizeof(nwchar_t
);
6297 if (n
>= 0 && nb
> (n
- array_length
))
6298 nb
= n
- array_length
;
6301 tcc_warning("initializer-string for array is too long");
6302 /* in order to go faster for common case (char
6303 string in global variable, we handle it
6305 if (sec
&& tok
== TOK_STR
&& size1
== 1) {
6306 memcpy(sec
->data
+ c
+ array_length
, tokc
.str
.data
, nb
);
6310 ch
= ((unsigned char *)tokc
.str
.data
)[i
];
6312 ch
= ((nwchar_t
*)tokc
.str
.data
)[i
];
6314 init_putv(t1
, sec
, c
+ (array_length
+ i
) * size1
);
6321 /* only add trailing zero if enough storage (no
6322 warning in this case since it is standard) */
6323 if (n
< 0 || array_length
< n
) {
6326 init_putv(t1
, sec
, c
+ (array_length
* size1
));
6336 while (tok
!= '}' || have_elem
) {
6337 decl_designator(type
, sec
, c
, &f
, size_only
);
6340 /* must put zero in holes (note that doing it that way
6341 ensures that it even works with designators) */
6342 if (!size_only
&& array_length
< index
) {
6343 init_putz(sec
, c
+ array_length
* size1
,
6344 (index
- array_length
) * size1
);
6346 if (type
->t
& VT_ARRAY
) {
6347 index
= indexsym
.c
= ++indexsym
.r
;
6349 index
= index
+ type_size(&f
->type
, &align1
);
6350 if (s
->type
.t
== TOK_UNION
)
6355 if (index
> array_length
)
6356 array_length
= index
;
6358 if (type
->t
& VT_ARRAY
) {
6359 /* special test for multi dimensional arrays (may not
6360 be strictly correct if designators are used at the
6362 if (no_oblock
&& index
>= n
)
6365 if (no_oblock
&& f
== NULL
)
6373 /* put zeros at the end */
6374 if (!size_only
&& array_length
< n
) {
6375 init_putz(sec
, c
+ array_length
* size1
,
6376 (n
- array_length
) * size1
);
6380 /* patch type size if needed, which happens only for array types */
6382 s
->c
= array_length
;
6383 } else if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
6386 if (first
|| tok
== '{') {
6395 } else if (tok
== '{') {
6397 decl_initializer(type
, sec
, c
, first
, size_only
);
6399 } else if (size_only
) {
6400 /* If we supported only ISO C we wouldn't have to accept calling
6401 this on anything than an array size_only==1 (and even then
6402 only on the outermost level, so no recursion would be needed),
6403 because initializing a flex array member isn't supported.
6404 But GNU C supports it, so we need to recurse even into
6405 subfields of structs and arrays when size_only is set. */
6406 /* just skip expression */
6407 parlevel
= parlevel1
= 0;
6408 while ((parlevel
> 0 || parlevel1
> 0 ||
6409 (tok
!= '}' && tok
!= ',')) && tok
!= -1) {
6412 else if (tok
== ')') {
6413 if (parlevel
== 0 && parlevel1
== 0)
6417 else if (tok
== '{')
6419 else if (tok
== '}') {
6420 if (parlevel
== 0 && parlevel1
== 0)
6428 /* This should happen only when we haven't parsed
6429 the init element above for fear of committing a
6430 string constant to memory too early. */
6431 if (tok
!= TOK_STR
&& tok
!= TOK_LSTR
)
6432 expect("string constant");
6433 parse_init_elem(!sec
? EXPR_ANY
: EXPR_CONST
);
6435 init_putv(type
, sec
, c
);
6439 /* parse an initializer for type 't' if 'has_init' is non zero, and
6440 allocate space in local or global data space ('r' is either
6441 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
6442 variable 'v' of scope 'scope' is declared before initializers
6443 are parsed. If 'v' is zero, then a reference to the new object
6444 is put in the value stack. If 'has_init' is 2, a special parsing
6445 is done to handle string constants. */
6446 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
,
6447 int has_init
, int v
, int scope
)
6449 int size
, align
, addr
, data_offset
;
6451 ParseState saved_parse_state
= {0};
6452 TokenString
*init_str
= NULL
;
6454 Sym
*flexible_array
;
6456 flexible_array
= NULL
;
6457 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
6458 Sym
*field
= type
->ref
->next
;
6461 field
= field
->next
;
6462 if (field
->type
.t
& VT_ARRAY
&& field
->type
.ref
->c
< 0)
6463 flexible_array
= field
;
6467 size
= type_size(type
, &align
);
6468 /* If unknown size, we must evaluate it before
6469 evaluating initializers because
6470 initializers can generate global data too
6471 (e.g. string pointers or ISOC99 compound
6472 literals). It also simplifies local
6473 initializers handling */
6474 if (size
< 0 || (flexible_array
&& has_init
)) {
6476 tcc_error("unknown type size");
6477 /* get all init string */
6478 init_str
= tok_str_alloc();
6479 if (has_init
== 2) {
6480 /* only get strings */
6481 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
6482 tok_str_add_tok(init_str
);
6487 while (level
> 0 || (tok
!= ',' && tok
!= ';')) {
6489 tcc_error("unexpected end of file in initializer");
6490 tok_str_add_tok(init_str
);
6493 else if (tok
== '}') {
6503 tok_str_add(init_str
, -1);
6504 tok_str_add(init_str
, 0);
6507 save_parse_state(&saved_parse_state
);
6509 begin_macro(init_str
, 1);
6511 decl_initializer(type
, NULL
, 0, 1, 1);
6512 /* prepare second initializer parsing */
6513 macro_ptr
= init_str
->str
;
6516 /* if still unknown size, error */
6517 size
= type_size(type
, &align
);
6519 tcc_error("unknown type size");
6521 /* If there's a flex member and it was used in the initializer
6523 if (flexible_array
&&
6524 flexible_array
->type
.ref
->c
> 0)
6525 size
+= flexible_array
->type
.ref
->c
6526 * pointed_size(&flexible_array
->type
);
6527 /* take into account specified alignment if bigger */
6528 if (ad
->a
.aligned
) {
6529 if (ad
->a
.aligned
> align
)
6530 align
= ad
->a
.aligned
;
6531 } else if (ad
->a
.packed
) {
6534 if ((r
& VT_VALMASK
) == VT_LOCAL
) {
6536 #ifdef CONFIG_TCC_BCHECK
6537 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
6541 loc
= (loc
- size
) & -align
;
6543 #ifdef CONFIG_TCC_BCHECK
6544 /* handles bounds */
6545 /* XXX: currently, since we do only one pass, we cannot track
6546 '&' operators, so we add only arrays */
6547 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
6549 /* add padding between regions */
6551 /* then add local bound info */
6552 bounds_ptr
= section_ptr_add(lbounds_section
, 2 * sizeof(addr_t
));
6553 bounds_ptr
[0] = addr
;
6554 bounds_ptr
[1] = size
;
6558 /* local variable */
6559 #ifdef CONFIG_TCC_ASM
6560 if (ad
->asm_label
) {
6561 int reg
= asm_parse_regvar(ad
->asm_label
);
6563 r
= (r
& ~VT_VALMASK
) | reg
;
6566 sym_push(v
, type
, r
, addr
);
6568 /* push local reference */
6569 vset(type
, r
, addr
);
6575 if (v
&& scope
== VT_CONST
) {
6576 /* see if the symbol was already defined */
6579 if (!is_compatible_types(&sym
->type
, type
))
6580 tcc_error("incompatible types for redefinition of '%s'",
6581 get_tok_str(v
, NULL
));
6582 if (sym
->type
.t
& VT_EXTERN
) {
6583 /* if the variable is extern, it was not allocated */
6584 sym
->type
.t
&= ~VT_EXTERN
;
6585 /* set array size if it was omitted in extern
6587 if ((sym
->type
.t
& VT_ARRAY
) &&
6588 sym
->type
.ref
->c
< 0 &&
6590 sym
->type
.ref
->c
= type
->ref
->c
;
6592 /* we accept several definitions of the same
6593 global variable. this is tricky, because we
6594 must play with the SHN_COMMON type of the symbol */
6595 /* XXX: should check if the variable was already
6596 initialized. It is incorrect to initialized it
6598 /* no init data, we won't add more to the symbol */
6605 /* allocate symbol in corresponding section */
6610 else if (tcc_state
->nocommon
)
6614 data_offset
= sec
->data_offset
;
6615 data_offset
= (data_offset
+ align
- 1) & -align
;
6617 /* very important to increment global pointer at this time
6618 because initializers themselves can create new initializers */
6619 data_offset
+= size
;
6620 #ifdef CONFIG_TCC_BCHECK
6621 /* add padding if bound check */
6622 if (tcc_state
->do_bounds_check
)
6625 sec
->data_offset
= data_offset
;
6626 /* allocate section space to put the data */
6627 if (sec
->sh_type
!= SHT_NOBITS
&&
6628 data_offset
> sec
->data_allocated
)
6629 section_realloc(sec
, data_offset
);
6630 /* align section if needed */
6631 if (align
> sec
->sh_addralign
)
6632 sec
->sh_addralign
= align
;
6634 addr
= 0; /* avoid warning */
6638 if (scope
!= VT_CONST
|| !sym
) {
6639 sym
= sym_push(v
, type
, r
| VT_SYM
, 0);
6640 sym
->asm_label
= ad
->asm_label
;
6642 /* update symbol definition */
6644 put_extern_sym(sym
, sec
, addr
, size
);
6647 /* put a common area */
6648 put_extern_sym(sym
, NULL
, align
, size
);
6649 /* XXX: find a nicer way */
6650 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
6651 esym
->st_shndx
= SHN_COMMON
;
6654 /* push global reference */
6655 sym
= get_sym_ref(type
, sec
, addr
, size
);
6656 vpushsym(type
, sym
);
6658 /* patch symbol weakness */
6659 if (type
->t
& VT_WEAK
)
6661 apply_visibility(sym
, type
);
6662 #ifdef CONFIG_TCC_BCHECK
6663 /* handles bounds now because the symbol must be defined
6664 before for the relocation */
6665 if (tcc_state
->do_bounds_check
) {
6668 greloc(bounds_section
, sym
, bounds_section
->data_offset
, R_DATA_PTR
);
6669 /* then add global bound info */
6670 bounds_ptr
= section_ptr_add(bounds_section
, 2 * sizeof(addr_t
));
6671 bounds_ptr
[0] = 0; /* relocated */
6672 bounds_ptr
[1] = size
;
6676 if (type
->t
& VT_VLA
) {
6679 /* save current stack pointer */
6680 if (vlas_in_scope
== 0) {
6681 if (vla_sp_root_loc
== -1)
6682 vla_sp_root_loc
= (loc
-= PTR_SIZE
);
6683 gen_vla_sp_save(vla_sp_root_loc
);
6686 vla_runtime_type_size(type
, &a
);
6687 gen_vla_alloc(type
, a
);
6688 gen_vla_sp_save(addr
);
6691 } else if (has_init
) {
6692 size_t oldreloc_offset
= 0;
6693 if (sec
&& sec
->reloc
)
6694 oldreloc_offset
= sec
->reloc
->data_offset
;
6695 decl_initializer(type
, sec
, addr
, 1, 0);
6696 if (sec
&& sec
->reloc
)
6697 squeeze_multi_relocs(sec
, oldreloc_offset
);
6698 /* patch flexible array member size back to -1, */
6699 /* for possible subsequent similar declarations */
6701 flexible_array
->type
.ref
->c
= -1;
6704 /* restore parse state if needed */
6707 restore_parse_state(&saved_parse_state
);
6711 static void put_func_debug(Sym
*sym
)
6716 /* XXX: we put here a dummy type */
6717 snprintf(buf
, sizeof(buf
), "%s:%c1",
6718 funcname
, sym
->type
.t
& VT_STATIC
? 'f' : 'F');
6719 put_stabs_r(buf
, N_FUN
, 0, file
->line_num
, 0,
6720 cur_text_section
, sym
->c
);
6721 /* //gr gdb wants a line at the function */
6722 put_stabn(N_SLINE
, 0, file
->line_num
, 0);
6727 /* parse an old style function declaration list */
6728 /* XXX: check multiple parameter */
6729 static void func_decl_list(Sym
*func_sym
)
6736 /* parse each declaration */
6737 while (tok
!= '{' && tok
!= ';' && tok
!= ',' && tok
!= TOK_EOF
&&
6738 tok
!= TOK_ASM1
&& tok
!= TOK_ASM2
&& tok
!= TOK_ASM3
) {
6739 if (!parse_btype(&btype
, &ad
))
6740 expect("declaration list");
6741 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
6742 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
6744 /* we accept no variable after */
6748 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
6749 /* find parameter in function parameter list */
6752 if ((s
->v
& ~SYM_FIELD
) == v
)
6756 tcc_error("declaration for parameter '%s' but no such parameter",
6757 get_tok_str(v
, NULL
));
6759 /* check that no storage specifier except 'register' was given */
6760 if (type
.t
& VT_STORAGE
)
6761 tcc_error("storage class specified for '%s'", get_tok_str(v
, NULL
));
6762 convert_parameter_type(&type
);
6763 /* we can add the type (NOTE: it could be local to the function) */
6765 /* accept other parameters */
6776 /* parse a function defined by symbol 'sym' and generate its code in
6777 'cur_text_section' */
6778 static void gen_function(Sym
*sym
)
6780 int saved_nocode_wanted
= nocode_wanted
;
6783 ind
= cur_text_section
->data_offset
;
6784 /* NOTE: we patch the symbol size later */
6785 put_extern_sym(sym
, cur_text_section
, ind
, 0);
6786 funcname
= get_tok_str(sym
->v
, NULL
);
6788 /* Initialize VLA state */
6790 vla_sp_root_loc
= -1;
6791 /* put debug symbol */
6792 if (tcc_state
->do_debug
)
6793 put_func_debug(sym
);
6795 /* push a dummy symbol to enable local sym storage */
6796 sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
6797 local_scope
= 1; /* for function parameters */
6798 gfunc_prolog(&sym
->type
);
6802 block(NULL
, NULL
, 0);
6805 cur_text_section
->data_offset
= ind
;
6806 label_pop(&global_label_stack
, NULL
);
6807 /* reset local stack */
6809 sym_pop(&local_stack
, NULL
, 0);
6810 /* end of function */
6811 /* patch symbol size */
6812 ((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
].st_size
=
6814 /* patch symbol weakness (this definition overrules any prototype) */
6815 if (sym
->type
.t
& VT_WEAK
)
6817 apply_visibility(sym
, &sym
->type
);
6818 if (tcc_state
->do_debug
) {
6819 put_stabn(N_FUN
, 0, 0, ind
- func_ind
);
6821 /* It's better to crash than to generate wrong code */
6822 cur_text_section
= NULL
;
6823 funcname
= ""; /* for safety */
6824 func_vt
.t
= VT_VOID
; /* for safety */
6825 func_var
= 0; /* for safety */
6826 ind
= 0; /* for safety */
6827 nocode_wanted
= saved_nocode_wanted
;
6831 static void gen_inline_functions(TCCState
*s
)
6834 int inline_generated
, i
, ln
;
6835 struct InlineFunc
*fn
;
6837 ln
= file
->line_num
;
6838 /* iterate while inline function are referenced */
6840 inline_generated
= 0;
6841 for (i
= 0; i
< s
->nb_inline_fns
; ++i
) {
6842 fn
= s
->inline_fns
[i
];
6844 if (sym
&& sym
->c
) {
6845 /* the function was used: generate its code and
6846 convert it to a normal function */
6849 pstrcpy(file
->filename
, sizeof file
->filename
, fn
->filename
);
6850 sym
->r
= VT_SYM
| VT_CONST
;
6851 sym
->type
.t
&= ~VT_INLINE
;
6853 begin_macro(fn
->func_str
, 1);
6855 cur_text_section
= text_section
;
6859 inline_generated
= 1;
6862 if (!inline_generated
)
6865 file
->line_num
= ln
;
6868 ST_FUNC
void free_inline_functions(TCCState
*s
)
6871 /* free tokens of unused inline functions */
6872 for (i
= 0; i
< s
->nb_inline_fns
; ++i
) {
6873 struct InlineFunc
*fn
= s
->inline_fns
[i
];
6875 tok_str_free(fn
->func_str
);
6877 dynarray_reset(&s
->inline_fns
, &s
->nb_inline_fns
);
6880 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
6881 static int decl0(int l
, int is_for_loop_init
)
6889 if (!parse_btype(&btype
, &ad
)) {
6890 if (is_for_loop_init
)
6892 /* skip redundant ';' */
6893 /* XXX: find more elegant solution */
6898 if (l
== VT_CONST
&&
6899 (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
6900 /* global asm block */
6904 /* special test for old K&R protos without explicit int
6905 type. Only accepted when defining global data */
6906 if (l
== VT_LOCAL
|| tok
< TOK_UIDENT
)
6910 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
6911 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
6913 if ((btype
.t
& VT_BTYPE
) == VT_STRUCT
) {
6914 int v
= btype
.ref
->v
;
6915 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) >= SYM_FIRST_ANOM
)
6916 tcc_warning("unnamed struct/union that defines no instances");
6921 while (1) { /* iterate thru each declaration */
6923 /* If the base type itself was an array type of unspecified
6924 size (like in 'typedef int arr[]; arr x = {1};') then
6925 we will overwrite the unknown size by the real one for
6926 this decl. We need to unshare the ref symbol holding
6928 if ((type
.t
& VT_ARRAY
) && type
.ref
->c
< 0) {
6929 type
.ref
= sym_push(SYM_FIELD
, &type
.ref
->type
, 0, type
.ref
->c
);
6931 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
6935 type_to_str(buf
, sizeof(buf
), t
, get_tok_str(v
, NULL
));
6936 printf("type = '%s'\n", buf
);
6939 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
6940 if ((type
.t
& VT_STATIC
) && (l
== VT_LOCAL
)) {
6941 tcc_error("function without file scope cannot be static");
6943 /* if old style function prototype, we accept a
6946 if (sym
->c
== FUNC_OLD
)
6947 func_decl_list(sym
);
6950 if (gnu_ext
&& (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
6951 ad
.asm_label
= asm_label_instr();
6952 /* parse one last attribute list, after asm label */
6953 parse_attribute(&ad
);
6960 #ifdef TCC_TARGET_PE
6961 if (ad
.a
.func_import
)
6962 type
.t
|= VT_IMPORT
;
6963 if (ad
.a
.func_export
)
6964 type
.t
|= VT_EXPORT
;
6966 type
.t
|= ad
.a
.visibility
<< VT_VIS_SHIFT
;
6970 tcc_error("cannot use local functions");
6971 if ((type
.t
& VT_BTYPE
) != VT_FUNC
)
6972 expect("function definition");
6974 /* reject abstract declarators in function definition */
6976 while ((sym
= sym
->next
) != NULL
)
6977 if (!(sym
->v
& ~SYM_FIELD
))
6978 expect("identifier");
6980 /* XXX: cannot do better now: convert extern line to static inline */
6981 if ((type
.t
& (VT_EXTERN
| VT_INLINE
)) == (VT_EXTERN
| VT_INLINE
))
6982 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
6987 if ((sym
->type
.t
& VT_BTYPE
) != VT_FUNC
)
6990 ref
= sym
->type
.ref
;
6991 if (0 == ref
->a
.func_proto
)
6992 tcc_error("redefinition of '%s'", get_tok_str(v
, NULL
));
6994 /* use func_call from prototype if not defined */
6995 if (ref
->a
.func_call
!= FUNC_CDECL
6996 && type
.ref
->a
.func_call
== FUNC_CDECL
)
6997 type
.ref
->a
.func_call
= ref
->a
.func_call
;
6999 /* use export from prototype */
7000 if (ref
->a
.func_export
)
7001 type
.ref
->a
.func_export
= 1;
7003 /* use static from prototype */
7004 if (sym
->type
.t
& VT_STATIC
)
7005 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
7007 /* If the definition has no visibility use the
7008 one from prototype. */
7009 if (! (type
.t
& VT_VIS_MASK
))
7010 type
.t
|= sym
->type
.t
& VT_VIS_MASK
;
7012 if (!is_compatible_types(&sym
->type
, &type
)) {
7014 tcc_error("incompatible types for redefinition of '%s'",
7015 get_tok_str(v
, NULL
));
7017 type
.ref
->a
.func_proto
= 0;
7018 /* if symbol is already defined, then put complete type */
7021 /* put function symbol */
7022 sym
= global_identifier_push(v
, type
.t
, 0);
7023 sym
->type
.ref
= type
.ref
;
7026 /* static inline functions are just recorded as a kind
7027 of macro. Their code will be emitted at the end of
7028 the compilation unit only if they are used */
7029 if ((type
.t
& (VT_INLINE
| VT_STATIC
)) ==
7030 (VT_INLINE
| VT_STATIC
)) {
7032 struct InlineFunc
*fn
;
7033 const char *filename
;
7035 filename
= file
? file
->filename
: "";
7036 fn
= tcc_malloc(sizeof *fn
+ strlen(filename
));
7037 strcpy(fn
->filename
, filename
);
7039 fn
->func_str
= tok_str_alloc();
7045 tcc_error("unexpected end of file");
7046 tok_str_add_tok(fn
->func_str
);
7051 } else if (t
== '}') {
7053 if (block_level
== 0)
7057 tok_str_add(fn
->func_str
, -1);
7058 tok_str_add(fn
->func_str
, 0);
7059 dynarray_add((void ***)&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
, fn
);
7062 /* compute text section */
7063 cur_text_section
= ad
.section
;
7064 if (!cur_text_section
)
7065 cur_text_section
= text_section
;
7066 sym
->r
= VT_SYM
| VT_CONST
;
7071 if (btype
.t
& VT_TYPEDEF
) {
7072 /* save typedefed type */
7073 /* XXX: test storage specifiers ? */
7075 if (sym
&& sym
->scope
== local_scope
) {
7076 if (!is_compatible_types(&sym
->type
, &type
)
7077 || !(sym
->type
.t
& VT_TYPEDEF
))
7078 tcc_error("incompatible redefinition of '%s'",
7079 get_tok_str(v
, NULL
));
7082 sym
= sym_push(v
, &type
, 0, 0);
7085 sym
->type
.t
|= VT_TYPEDEF
;
7088 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
7089 /* external function definition */
7090 /* specific case for func_call attribute */
7091 ad
.a
.func_proto
= 1;
7093 } else if (!(type
.t
& VT_ARRAY
)) {
7094 /* not lvalue if array */
7095 r
|= lvalue_type(type
.t
);
7097 has_init
= (tok
== '=');
7098 if (has_init
&& (type
.t
& VT_VLA
))
7099 tcc_error("variable length array cannot be initialized");
7100 if ((btype
.t
& VT_EXTERN
) || ((type
.t
& VT_BTYPE
) == VT_FUNC
) ||
7101 ((type
.t
& VT_ARRAY
) && (type
.t
& VT_STATIC
) &&
7102 !has_init
&& l
== VT_CONST
&& type
.ref
->c
< 0)) {
7103 /* external variable or function */
7104 /* NOTE: as GCC, uninitialized global static
7105 arrays of null size are considered as
7107 sym
= external_sym(v
, &type
, r
);
7108 sym
->asm_label
= ad
.asm_label
;
7110 if (ad
.alias_target
) {
7115 alias_target
= sym_find(ad
.alias_target
);
7116 if (!alias_target
|| !alias_target
->c
)
7117 tcc_error("unsupported forward __alias__ attribute");
7118 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[alias_target
->c
];
7119 tsec
.sh_num
= esym
->st_shndx
;
7120 put_extern_sym2(sym
, &tsec
, esym
->st_value
, esym
->st_size
, 0);
7123 type
.t
|= (btype
.t
& VT_STATIC
); /* Retain "static". */
7124 if (type
.t
& VT_STATIC
)
7130 decl_initializer_alloc(&type
, &ad
, r
, has_init
, v
, l
);
7134 if (is_for_loop_init
)
7147 ST_FUNC
void decl(int l
)
7152 /* ------------------------------------------------------------------------- */