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
) &&
3243 (s
->type
.t
& VT_BTYPE
) == VT_STRUCT
&&
3244 (s
->v
& ~SYM_FIELD
) >= SYM_FIRST_ANOM
) {
3245 Sym
*ret
= find_field (&s
->type
, v
);
3255 static void struct_add_offset (Sym
*s
, int offset
)
3257 while ((s
= s
->next
) != NULL
) {
3258 if ((s
->v
& SYM_FIELD
) &&
3259 (s
->type
.t
& VT_BTYPE
) == VT_STRUCT
&&
3260 (s
->v
& ~SYM_FIELD
) >= SYM_FIRST_ANOM
) {
3261 struct_add_offset(s
->type
.ref
, offset
);
3267 static void struct_layout(CType
*type
, AttributeDef
*ad
)
3269 int align
, maxalign
, offset
, c
, bit_pos
, bt
, prevbt
;
3272 maxalign
= ad
->a
.aligned
;
3278 prevbt
= VT_STRUCT
; /* make it never match */
3279 for (f
= type
->ref
->next
; f
; f
= f
->next
) {
3280 int extra_bytes
= 0;
3281 int typealign
, bit_size
;
3282 int size
= type_size(&f
->type
, &typealign
);
3283 int pcc
= !tcc_state
->ms_bitfields
;
3284 if (f
->type
.t
& VT_BITFIELD
) {
3285 bit_size
= (f
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
3286 /* without ms-bitfields, allocate the
3287 * minimum number of bytes necessary,
3288 * adding single bytes as needed */
3289 if (!tcc_state
->ms_bitfields
) {
3291 /* minimum bytes for new bitfield */
3292 size
= (bit_size
+ 7) / 8;
3294 /* enough spare bits already allocated? */
3295 int add_size
= (bit_pos
- 1) % 8 + 1 + bit_size
;
3296 if (add_size
> 8) /* doesn't fit */
3297 extra_bytes
= (add_size
- 1) / 8;
3302 if (bit_size
== 0 && pcc
) {
3303 /* Zero-width bit-fields in PCC mode aren't affected
3304 by any packing (attribute or pragma). */
3306 } else if (f
->r
> 1) {
3308 } else if (ad
->a
.packed
|| f
->r
== 1) {
3314 /*if (extra_bytes) c += extra_bytes;
3315 else*/ if (bit_size
< 0) {
3316 int addbytes
= pcc
? (bit_pos
+ 7) >> 3 : 0;
3317 if (type
->ref
->type
.t
== TOK_STRUCT
) {
3318 c
= (c
+ addbytes
+ align
- 1) & -align
;
3329 if (align
> maxalign
)
3334 /* A bit-field. Layout is more complicated. There are two
3335 options TCC implements: PCC compatible and MS compatible
3336 (PCC compatible is what GCC uses for almost all targets). */
3338 if (type
->ref
->type
.t
== TOK_STRUCT
) {
3339 /* Don't align c here. That's only to be done
3340 in certain cases. */
3347 /* In PCC layout a non-packed bit-field is placed adjacent
3348 to the preceding bit-fields, except if it would overflow
3349 its container (depending on base type) or it's a zero-width
3350 bit-field. Packed non-zero-width bit-fields always are
3352 if ((typealign
!= 1 &&
3353 bit_pos
+ bit_size
> size
* 8) ||
3355 c
= (c
+ ((bit_pos
+ 7) >> 3) + typealign
- 1) & -typealign
;
3359 /* In PCC layout named bit-fields influence the alignment
3360 of the containing struct using the base types alignment,
3361 except for packed fields or zero-width fields. */
3363 if (align
> maxalign
)
3365 if (typealign
> maxalign
)
3366 maxalign
= typealign
;
3369 bt
= f
->type
.t
& VT_BTYPE
;
3372 bit_pos
+ bit_size
> size
* 8) ||
3373 (bit_size
== 0 && prevbt
== bt
) ||
3374 (bit_size
> 0 && bt
!= prevbt
))) {
3375 c
= (c
+ typealign
- 1) & -typealign
;
3378 /* In MS bitfield mode a bit-field run always uses
3379 at least as many bits as the underlying type. */
3382 if (bit_size
> 0 || prevbt
== bt
) {
3383 if (align
> maxalign
)
3385 if (typealign
> maxalign
)
3386 maxalign
= typealign
;
3390 f
->type
.t
= (f
->type
.t
& ~(0x3f << VT_STRUCT_SHIFT
))
3391 | (bit_pos
<< VT_STRUCT_SHIFT
);
3392 bit_pos
+= bit_size
;
3393 if (pcc
&& bit_pos
>= size
* 8) {
3395 bit_pos
-= size
* 8;
3399 printf("set field %s offset=%d c=%d",
3400 get_tok_str(f
->v
& ~SYM_FIELD
, NULL
), offset
, c
);
3401 if (f
->type
.t
& VT_BITFIELD
) {
3402 printf(" pos=%d size=%d",
3403 (f
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f,
3404 (f
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f);
3409 if (f
->v
& SYM_FIRST_ANOM
&& (f
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
3411 /* An anonymous struct/union. Adjust member offsets
3412 to reflect the real offset of our containing struct.
3413 Also set the offset of this anon member inside
3414 the outer struct to be zero. Via this it
3415 works when accessing the field offset directly
3416 (from base object), as well as when recursing
3417 members in initializer handling. */
3418 int v2
= f
->type
.ref
->v
;
3419 if (!(v2
& SYM_FIELD
) &&
3420 (v2
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
3422 /* This happens only with MS extensions. The
3423 anon member has a named struct type, so it
3424 potentially is shared with other references.
3425 We need to unshare members so we can modify
3428 f
->type
.ref
= sym_push(anon_sym
++ | SYM_FIELD
,
3429 &f
->type
.ref
->type
, 0,
3431 pps
= &f
->type
.ref
->next
;
3432 while ((ass
= ass
->next
) != NULL
) {
3433 *pps
= sym_push(ass
->v
, &ass
->type
, 0, ass
->c
);
3434 pps
= &((*pps
)->next
);
3438 struct_add_offset(f
->type
.ref
, offset
);
3446 /* store size and alignment */
3447 type
->ref
->c
= (c
+ ((bit_pos
+ 7) >> 3) + maxalign
- 1) & -maxalign
;
3448 type
->ref
->r
= maxalign
;
3451 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
3452 static void struct_decl(CType
*type
, AttributeDef
*ad
, int u
)
3455 int a
, v
, size
, align
, flexible
, alignoverride
;
3457 int bit_size
, bit_pos
, bsize
, bt
, prevbt
;
3462 a
= tok
; /* save decl type */
3464 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3465 parse_attribute(ad
);
3469 /* struct already defined ? return it */
3471 expect("struct/union/enum name");
3473 if (s
&& (s
->scope
== local_scope
|| (tok
!= '{' && tok
!= ';'))) {
3475 tcc_error("redefinition of '%s'", get_tok_str(v
, NULL
));
3481 /* Record the original enum/struct/union token. */
3484 /* we put an undefined size for struct/union */
3485 s
= sym_push(v
| SYM_STRUCT
, &type1
, 0, -1);
3486 s
->r
= 0; /* default alignment is zero as gcc */
3487 /* put struct/union/enum name in type */
3495 tcc_error("struct/union/enum already defined");
3496 /* cannot be empty */
3498 /* non empty enums are not allowed */
3499 if (a
== TOK_ENUM
) {
3503 CType
*t
= &int_type
;
3506 expect("identifier");
3508 if (ss
&& !local_stack
)
3509 tcc_error("redefinition of enumerator '%s'",
3510 get_tok_str(v
, NULL
));
3514 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
3517 /* We really want to support long long enums
3518 on i386 as well, but the Sym structure only
3519 holds a 'long' for associated constants,
3520 and enlarging it would bump its size (no
3521 available padding). So punt for now. */
3527 if (c
!= (int)c
&& (unsigned long)c
!= (unsigned int)c
)
3528 seen_wide
= 1, t
= &size_type
;
3529 /* enum symbols have static storage */
3530 ss
= sym_push(v
, t
, VT_CONST
, c
);
3531 ss
->type
.t
|= VT_STATIC
;
3536 /* NOTE: we accept a trailing comma */
3541 s
->a
.unsigned_enum
= 1;
3542 s
->c
= type_size(seen_wide
? &size_type
: &int_type
, &align
);
3549 while (tok
!= '}') {
3550 if (!parse_btype(&btype
, &ad1
)) {
3557 tcc_error("flexible array member '%s' not at the end of struct",
3558 get_tok_str(v
, NULL
));
3563 type_decl(&type1
, &ad1
, &v
, TYPE_DIRECT
| TYPE_ABSTRACT
);
3565 if ((type1
.t
& VT_BTYPE
) != VT_STRUCT
)
3566 expect("identifier");
3568 int v
= btype
.ref
->v
;
3569 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
3570 if (tcc_state
->ms_extensions
== 0)
3571 expect("identifier");
3575 if (type_size(&type1
, &align
) < 0) {
3576 if ((a
== TOK_STRUCT
) && (type1
.t
& VT_ARRAY
) && c
)
3579 tcc_error("field '%s' has incomplete type",
3580 get_tok_str(v
, NULL
));
3582 if ((type1
.t
& VT_BTYPE
) == VT_FUNC
||
3583 (type1
.t
& (VT_TYPEDEF
| VT_STATIC
| VT_EXTERN
| VT_INLINE
)))
3584 tcc_error("invalid type for '%s'",
3585 get_tok_str(v
, NULL
));
3589 bit_size
= expr_const();
3590 /* XXX: handle v = 0 case for messages */
3592 tcc_error("negative width in bit-field '%s'",
3593 get_tok_str(v
, NULL
));
3594 if (v
&& bit_size
== 0)
3595 tcc_error("zero width for bit-field '%s'",
3596 get_tok_str(v
, NULL
));
3597 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3598 parse_attribute(&ad1
);
3600 size
= type_size(&type1
, &align
);
3601 /* Only remember non-default alignment. */
3603 if (ad1
.a
.aligned
) {
3604 if (align
< ad1
.a
.aligned
)
3605 alignoverride
= ad1
.a
.aligned
;
3606 } else if (ad1
.a
.packed
|| ad
->a
.packed
) {
3608 } else if (*tcc_state
->pack_stack_ptr
) {
3609 if (align
> *tcc_state
->pack_stack_ptr
)
3610 alignoverride
= *tcc_state
->pack_stack_ptr
;
3612 if (bit_size
>= 0) {
3613 bt
= type1
.t
& VT_BTYPE
;
3620 tcc_error("bitfields must have scalar type");
3622 if (bit_size
> bsize
) {
3623 tcc_error("width of '%s' exceeds its type",
3624 get_tok_str(v
, NULL
));
3625 } else if (bit_size
== bsize
) {
3626 /* no need for bit fields */
3629 /* if type change, union, or will overrun
3630 * allignment slot, start at a newly
3632 if ((bit_pos
+ bit_size
) > bsize
||
3633 bt
!= prevbt
|| a
== TOK_UNION
)
3635 /* XXX: handle LSB first */
3636 type1
.t
|= VT_BITFIELD
|
3637 (bit_pos
<< VT_STRUCT_SHIFT
) |
3638 (bit_size
<< (VT_STRUCT_SHIFT
+ 6));
3639 bit_pos
+= bit_size
;
3645 if (v
!= 0 || (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
3646 /* Remember we've seen a real field to check
3647 for placement of flexible array member. */
3650 if (v
== 0 && (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
3651 /* See struct_layout for special casing
3652 anonymous member of struct type. */
3655 if (v
== 0 && bit_size
>= 0) {
3656 /* Need to remember anon bit-fields as well.
3657 They influence layout. */
3661 ss
= sym_push(v
| SYM_FIELD
, &type1
, alignoverride
, extra_bytes
);
3665 if (tok
== ';' || tok
== TOK_EOF
)
3672 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3673 parse_attribute(ad
);
3674 struct_layout(type
, ad
);
3679 /* return 1 if basic type is a type size (short, long, long long) */
3680 ST_FUNC
int is_btype_size(int bt
)
3682 return bt
== VT_SHORT
|| bt
== VT_LONG
|| bt
== VT_LLONG
;
3685 /* Add type qualifiers to a type. If the type is an array then the qualifiers
3686 are added to the element type, copied because it could be a typedef. */
3687 static void parse_btype_qualify(CType
*type
, int qualifiers
)
3689 while (type
->t
& VT_ARRAY
) {
3690 type
->ref
= sym_push(SYM_FIELD
, &type
->ref
->type
, 0, type
->ref
->c
);
3691 type
= &type
->ref
->type
;
3693 type
->t
|= qualifiers
;
3696 /* return 0 if no type declaration. otherwise, return the basic type
3699 static int parse_btype(CType
*type
, AttributeDef
*ad
)
3701 int t
, u
, bt_size
, complete
, type_found
, typespec_found
;
3705 memset(ad
, 0, sizeof(AttributeDef
));
3713 /* currently, we really ignore extension */
3724 tcc_error("too many basic types");
3726 bt_size
= is_btype_size (u
& VT_BTYPE
);
3727 if (u
== VT_INT
|| (!bt_size
&& !(t
& VT_TYPEDEF
)))
3742 if ((t
& VT_BTYPE
) == VT_DOUBLE
) {
3743 #ifndef TCC_TARGET_PE
3744 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3746 } else if ((t
& VT_BTYPE
) == VT_LONG
) {
3747 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3753 #ifdef TCC_TARGET_ARM64
3755 /* GCC's __uint128_t appears in some Linux header files. Make it a
3756 synonym for long double to get the size and alignment right. */
3768 if ((t
& VT_BTYPE
) == VT_LONG
) {
3769 #ifdef TCC_TARGET_PE
3770 t
= (t
& ~VT_BTYPE
) | VT_DOUBLE
;
3772 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3780 struct_decl(&type1
, ad
, VT_ENUM
);
3783 type
->ref
= type1
.ref
;
3787 struct_decl(&type1
, ad
, VT_STRUCT
);
3790 /* type modifiers */
3795 parse_btype_qualify(type
, VT_CONSTANT
);
3803 parse_btype_qualify(type
, VT_VOLATILE
);
3810 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == (VT_DEFSIGN
|VT_UNSIGNED
))
3811 tcc_error("signed and unsigned modifier");
3824 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == VT_DEFSIGN
)
3825 tcc_error("signed and unsigned modifier");
3826 t
|= VT_DEFSIGN
| VT_UNSIGNED
;
3851 /* GNUC attribute */
3852 case TOK_ATTRIBUTE1
:
3853 case TOK_ATTRIBUTE2
:
3854 parse_attribute(ad
);
3857 t
= (t
& ~VT_BTYPE
) | u
;
3865 parse_expr_type(&type1
);
3866 /* remove all storage modifiers except typedef */
3867 type1
.t
&= ~(VT_STORAGE
&~VT_TYPEDEF
);
3873 if (!s
|| !(s
->type
.t
& VT_TYPEDEF
))
3876 type
->t
= ((s
->type
.t
& ~VT_TYPEDEF
) |
3877 (t
& ~(VT_CONSTANT
| VT_VOLATILE
)));
3878 type
->ref
= s
->type
.ref
;
3879 if (t
& (VT_CONSTANT
| VT_VOLATILE
))
3880 parse_btype_qualify(type
, t
& (VT_CONSTANT
| VT_VOLATILE
));
3884 /* get attributes from typedef */
3885 if (0 == ad
->a
.aligned
)
3886 ad
->a
.aligned
= s
->a
.aligned
;
3887 if (0 == ad
->a
.func_call
)
3888 ad
->a
.func_call
= s
->a
.func_call
;
3889 ad
->a
.packed
|= s
->a
.packed
;
3898 if (tcc_state
->char_is_unsigned
) {
3899 if ((t
& (VT_DEFSIGN
|VT_BTYPE
)) == VT_BYTE
)
3903 /* long is never used as type */
3904 if ((t
& VT_BTYPE
) == VT_LONG
)
3905 #if (!defined TCC_TARGET_X86_64 && !defined TCC_TARGET_ARM64) || \
3906 defined TCC_TARGET_PE
3907 t
= (t
& ~VT_BTYPE
) | VT_INT
;
3909 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3915 /* convert a function parameter type (array to pointer and function to
3916 function pointer) */
3917 static inline void convert_parameter_type(CType
*pt
)
3919 /* remove const and volatile qualifiers (XXX: const could be used
3920 to indicate a const function parameter */
3921 pt
->t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3922 /* array must be transformed to pointer according to ANSI C */
3924 if ((pt
->t
& VT_BTYPE
) == VT_FUNC
) {
3929 ST_FUNC
void parse_asm_str(CString
*astr
)
3932 parse_mult_str(astr
, "string constant");
3935 /* Parse an asm label and return the token */
3936 static int asm_label_instr(void)
3942 parse_asm_str(&astr
);
3945 printf("asm_alias: \"%s\"\n", (char *)astr
.data
);
3947 v
= tok_alloc(astr
.data
, astr
.size
- 1)->tok
;
3952 static void post_type(CType
*type
, AttributeDef
*ad
, int storage
)
3954 int n
, l
, t1
, arg_size
, align
;
3955 Sym
**plast
, *s
, *first
;
3960 /* function declaration */
3968 /* read param name and compute offset */
3969 if (l
!= FUNC_OLD
) {
3970 if (!parse_btype(&pt
, &ad1
)) {
3972 tcc_error("invalid type");
3979 if ((pt
.t
& VT_BTYPE
) == VT_VOID
&& tok
== ')')
3981 type_decl(&pt
, &ad1
, &n
, TYPE_DIRECT
| TYPE_ABSTRACT
);
3982 if ((pt
.t
& VT_BTYPE
) == VT_VOID
)
3983 tcc_error("parameter declared as void");
3984 arg_size
+= (type_size(&pt
, &align
) + PTR_SIZE
- 1) / PTR_SIZE
;
3989 expect("identifier");
3993 convert_parameter_type(&pt
);
3994 s
= sym_push(n
| SYM_FIELD
, &pt
, 0, 0);
4000 if (l
== FUNC_NEW
&& tok
== TOK_DOTS
) {
4007 /* if no parameters, then old type prototype */
4011 /* NOTE: const is ignored in returned type as it has a special
4012 meaning in gcc / C++ */
4013 type
->t
&= ~VT_CONSTANT
;
4014 /* some ancient pre-K&R C allows a function to return an array
4015 and the array brackets to be put after the arguments, such
4016 that "int c()[]" means something like "int[] c()" */
4019 skip(']'); /* only handle simple "[]" */
4022 /* we push a anonymous symbol which will contain the function prototype */
4023 ad
->a
.func_args
= arg_size
;
4024 s
= sym_push(SYM_FIELD
, type
, 0, l
);
4029 } else if (tok
== '[') {
4030 int saved_nocode_wanted
= nocode_wanted
;
4031 /* array definition */
4033 if (tok
== TOK_RESTRICT1
)
4038 if (!local_stack
|| (storage
& VT_STATIC
))
4039 vpushi(expr_const());
4041 /* VLAs (which can only happen with local_stack && !VT_STATIC)
4042 length must always be evaluated, even under nocode_wanted,
4043 so that its size slot is initialized (e.g. under sizeof
4048 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
4051 tcc_error("invalid array size");
4053 if (!is_integer_btype(vtop
->type
.t
& VT_BTYPE
))
4054 tcc_error("size of variable length array should be an integer");
4059 /* parse next post type */
4060 post_type(type
, ad
, storage
);
4061 if (type
->t
== VT_FUNC
)
4062 tcc_error("declaration of an array of functions");
4063 t1
|= type
->t
& VT_VLA
;
4066 loc
-= type_size(&int_type
, &align
);
4070 vla_runtime_type_size(type
, &align
);
4072 vset(&int_type
, VT_LOCAL
|VT_LVAL
, n
);
4078 nocode_wanted
= saved_nocode_wanted
;
4080 /* we push an anonymous symbol which will contain the array
4082 s
= sym_push(SYM_FIELD
, type
, 0, n
);
4083 type
->t
= (t1
? VT_VLA
: VT_ARRAY
) | VT_PTR
;
4088 /* Parse a type declaration (except basic type), and return the type
4089 in 'type'. 'td' is a bitmask indicating which kind of type decl is
4090 expected. 'type' should contain the basic type. 'ad' is the
4091 attribute definition of the basic type. It can be modified by
4094 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
)
4097 CType type1
, *type2
;
4098 int qualifiers
, storage
;
4100 while (tok
== '*') {
4108 qualifiers
|= VT_CONSTANT
;
4113 qualifiers
|= VT_VOLATILE
;
4119 /* XXX: clarify attribute handling */
4120 case TOK_ATTRIBUTE1
:
4121 case TOK_ATTRIBUTE2
:
4122 parse_attribute(ad
);
4126 type
->t
|= qualifiers
;
4129 /* recursive type */
4130 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
4131 type1
.t
= 0; /* XXX: same as int */
4134 /* XXX: this is not correct to modify 'ad' at this point, but
4135 the syntax is not clear */
4136 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
4137 parse_attribute(ad
);
4138 type_decl(&type1
, ad
, v
, td
);
4141 /* type identifier */
4142 if (tok
>= TOK_IDENT
&& (td
& TYPE_DIRECT
)) {
4146 if (!(td
& TYPE_ABSTRACT
))
4147 expect("identifier");
4151 storage
= type
->t
& VT_STORAGE
;
4152 type
->t
&= ~VT_STORAGE
;
4153 post_type(type
, ad
, storage
);
4155 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
4156 parse_attribute(ad
);
4160 /* append type at the end of type1 */
4173 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
4174 ST_FUNC
int lvalue_type(int t
)
4179 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
4181 else if (bt
== VT_SHORT
)
4185 if (t
& VT_UNSIGNED
)
4186 r
|= VT_LVAL_UNSIGNED
;
4190 /* indirection with full error checking and bound check */
4191 ST_FUNC
void indir(void)
4193 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
) {
4194 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FUNC
)
4198 if ((vtop
->r
& VT_LVAL
) && !nocode_wanted
)
4200 vtop
->type
= *pointed_type(&vtop
->type
);
4201 /* Arrays and functions are never lvalues */
4202 if (!(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_VLA
)
4203 && (vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
4204 vtop
->r
|= lvalue_type(vtop
->type
.t
);
4205 /* if bound checking, the referenced pointer must be checked */
4206 #ifdef CONFIG_TCC_BCHECK
4207 if (tcc_state
->do_bounds_check
)
4208 vtop
->r
|= VT_MUSTBOUND
;
4213 /* pass a parameter to a function and do type checking and casting */
4214 static void gfunc_param_typed(Sym
*func
, Sym
*arg
)
4219 func_type
= func
->c
;
4220 if (func_type
== FUNC_OLD
||
4221 (func_type
== FUNC_ELLIPSIS
&& arg
== NULL
)) {
4222 /* default casting : only need to convert float to double */
4223 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
) {
4226 } else if (vtop
->type
.t
& VT_BITFIELD
) {
4227 type
.t
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
4228 type
.ref
= vtop
->type
.ref
;
4231 } else if (arg
== NULL
) {
4232 tcc_error("too many arguments to function");
4235 type
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
4236 gen_assign_cast(&type
);
4240 /* parse an expression of the form '(type)' or '(expr)' and return its
4242 static void parse_expr_type(CType
*type
)
4248 if (parse_btype(type
, &ad
)) {
4249 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
4256 static void parse_type(CType
*type
)
4261 if (!parse_btype(type
, &ad
)) {
4264 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
4267 static void vpush_tokc(int t
)
4272 vsetc(&type
, VT_CONST
, &tokc
);
4275 ST_FUNC
void unary(void)
4277 int n
, t
, align
, size
, r
, sizeof_caller
;
4282 sizeof_caller
= in_sizeof
;
4284 /* XXX: GCC 2.95.3 does not generate a table although it should be
4298 vpush_tokc(VT_INT
| VT_UNSIGNED
);
4302 vpush_tokc(VT_LLONG
);
4306 vpush_tokc(VT_LLONG
| VT_UNSIGNED
);
4310 vpush_tokc(VT_FLOAT
);
4314 vpush_tokc(VT_DOUBLE
);
4318 vpush_tokc(VT_LDOUBLE
);
4321 case TOK___FUNCTION__
:
4323 goto tok_identifier
;
4329 /* special function name identifier */
4330 len
= strlen(funcname
) + 1;
4331 /* generate char[len] type */
4336 vpush_ref(&type
, data_section
, data_section
->data_offset
, len
);
4337 ptr
= section_ptr_add(data_section
, len
);
4338 memcpy(ptr
, funcname
, len
);
4343 #ifdef TCC_TARGET_PE
4344 t
= VT_SHORT
| VT_UNSIGNED
;
4350 /* string parsing */
4353 if (tcc_state
->warn_write_strings
)
4358 memset(&ad
, 0, sizeof(AttributeDef
));
4359 decl_initializer_alloc(&type
, &ad
, VT_CONST
, 2, 0, 0);
4364 if (parse_btype(&type
, &ad
)) {
4365 type_decl(&type
, &ad
, &n
, TYPE_ABSTRACT
);
4367 /* check ISOC99 compound literal */
4369 /* data is allocated locally by default */
4374 /* all except arrays are lvalues */
4375 if (!(type
.t
& VT_ARRAY
))
4376 r
|= lvalue_type(type
.t
);
4377 memset(&ad
, 0, sizeof(AttributeDef
));
4378 decl_initializer_alloc(&type
, &ad
, r
, 1, 0, 0);
4380 if (sizeof_caller
) {
4387 } else if (tok
== '{') {
4389 tcc_error("expected constant");
4390 /* save all registers */
4393 /* statement expression : we do not accept break/continue
4394 inside as GCC does */
4395 block(NULL
, NULL
, 1);
4410 /* functions names must be treated as function pointers,
4411 except for unary '&' and sizeof. Since we consider that
4412 functions are not lvalues, we only have to handle it
4413 there and in function calls. */
4414 /* arrays can also be used although they are not lvalues */
4415 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
&&
4416 !(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_LLOCAL
))
4418 mk_pointer(&vtop
->type
);
4424 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
4426 boolean
.t
= VT_BOOL
;
4428 vtop
->c
.i
= !vtop
->c
.i
;
4429 } else if ((vtop
->r
& VT_VALMASK
) == VT_CMP
)
4433 vseti(VT_JMP
, gvtst(1, 0));
4445 if ((vtop
->type
.t
& VT_BTYPE
) == VT_PTR
)
4446 tcc_error("pointer not accepted for unary plus");
4447 /* In order to force cast, we add zero, except for floating point
4448 where we really need an noop (otherwise -0.0 will be transformed
4450 if (!is_float(vtop
->type
.t
)) {
4461 unary_type(&type
); // Perform a in_sizeof = 0;
4462 size
= type_size(&type
, &align
);
4463 if (t
== TOK_SIZEOF
) {
4464 if (!(type
.t
& VT_VLA
)) {
4466 tcc_error("sizeof applied to an incomplete type");
4469 vla_runtime_type_size(&type
, &align
);
4474 vtop
->type
.t
|= VT_UNSIGNED
;
4477 case TOK_builtin_expect
:
4479 /* __builtin_expect is a no-op for now */
4480 int saved_nocode_wanted
;
4485 saved_nocode_wanted
= nocode_wanted
;
4489 nocode_wanted
= saved_nocode_wanted
;
4493 case TOK_builtin_types_compatible_p
:
4502 type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
4503 type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
4504 vpushi(is_compatible_types(&type1
, &type2
));
4507 case TOK_builtin_choose_expr
:
4509 int saved_nocode_wanted
;
4516 saved_nocode_wanted
= nocode_wanted
;
4522 nocode_wanted
= saved_nocode_wanted
;
4526 saved_nocode_wanted
= nocode_wanted
;
4532 nocode_wanted
= saved_nocode_wanted
;
4537 case TOK_builtin_constant_p
:
4539 int saved_nocode_wanted
, res
;
4542 saved_nocode_wanted
= nocode_wanted
;
4545 res
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
4547 nocode_wanted
= saved_nocode_wanted
;
4552 case TOK_builtin_frame_address
:
4553 case TOK_builtin_return_address
:
4560 if (tok
!= TOK_CINT
) {
4561 tcc_error("%s only takes positive integers",
4562 tok1
== TOK_builtin_return_address
?
4563 "__builtin_return_address" :
4564 "__builtin_frame_address");
4566 level
= (uint32_t)tokc
.i
;
4571 vset(&type
, VT_LOCAL
, 0); /* local frame */
4573 mk_pointer(&vtop
->type
);
4574 indir(); /* -> parent frame */
4576 if (tok1
== TOK_builtin_return_address
) {
4577 // assume return address is just above frame pointer on stack
4580 mk_pointer(&vtop
->type
);
4585 #ifdef TCC_TARGET_X86_64
4586 #ifdef TCC_TARGET_PE
4587 case TOK_builtin_va_start
:
4595 if ((vtop
->r
& VT_VALMASK
) != VT_LOCAL
)
4596 tcc_error("__builtin_va_start expects a local variable");
4597 vtop
->r
&= ~(VT_LVAL
| VT_REF
);
4598 vtop
->type
= char_pointer_type
;
4604 case TOK_builtin_va_arg_types
:
4611 vpushi(classify_x86_64_va_arg(&type
));
4617 #ifdef TCC_TARGET_ARM64
4618 case TOK___va_start
: {
4620 tcc_error("statement in global scope");
4630 vtop
->type
.t
= VT_VOID
;
4633 case TOK___va_arg
: {
4636 tcc_error("statement in global scope");
4648 case TOK___arm64_clear_cache
: {
4657 vtop
->type
.t
= VT_VOID
;
4661 /* pre operations */
4672 t
= vtop
->type
.t
& VT_BTYPE
;
4674 /* In IEEE negate(x) isn't subtract(0,x), but rather
4679 else if (t
== VT_DOUBLE
)
4690 goto tok_identifier
;
4692 /* allow to take the address of a label */
4693 if (tok
< TOK_UIDENT
)
4694 expect("label identifier");
4695 s
= label_find(tok
);
4697 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
4699 if (s
->r
== LABEL_DECLARED
)
4700 s
->r
= LABEL_FORWARD
;
4703 s
->type
.t
= VT_VOID
;
4704 mk_pointer(&s
->type
);
4705 s
->type
.t
|= VT_STATIC
;
4707 vpushsym(&s
->type
, s
);
4711 // special qnan , snan and infinity values
4713 vpush64(VT_DOUBLE
, 0x7ff8000000000000ULL
);
4717 vpush64(VT_DOUBLE
, 0x7ff0000000000001ULL
);
4721 vpush64(VT_DOUBLE
, 0x7ff0000000000000ULL
);
4730 expect("identifier");
4733 const char *name
= get_tok_str(t
, NULL
);
4735 tcc_error("'%s' undeclared", name
);
4736 /* for simple function calls, we tolerate undeclared
4737 external reference to int() function */
4738 if (tcc_state
->warn_implicit_function_declaration
4739 #ifdef TCC_TARGET_PE
4740 /* people must be warned about using undeclared WINAPI functions
4741 (which usually start with uppercase letter) */
4742 || (name
[0] >= 'A' && name
[0] <= 'Z')
4745 tcc_warning("implicit declaration of function '%s'", name
);
4746 s
= external_global_sym(t
, &func_old_type
, 0);
4748 if ((s
->type
.t
& (VT_STATIC
| VT_INLINE
| VT_BTYPE
)) ==
4749 (VT_STATIC
| VT_INLINE
| VT_FUNC
)) {
4750 /* if referencing an inline function, then we generate a
4751 symbol to it if not already done. It will have the
4752 effect to generate code for it at the end of the
4753 compilation unit. Inline function as always
4754 generated in the text section. */
4755 if (!s
->c
&& !nocode_wanted
)
4756 put_extern_sym(s
, text_section
, 0, 0);
4757 r
= VT_SYM
| VT_CONST
;
4760 /* A symbol that has a register is a local register variable,
4761 which starts out as VT_LOCAL value. */
4762 if ((r
& VT_VALMASK
) < VT_CONST
)
4763 r
= (r
& ~VT_VALMASK
) | VT_LOCAL
;
4765 vset(&s
->type
, r
, s
->c
);
4766 /* Point to s as backpointer (even without r&VT_SYM).
4767 Will be used by at least the x86 inline asm parser for
4770 if (vtop
->r
& VT_SYM
) {
4776 /* post operations */
4778 if (tok
== TOK_INC
|| tok
== TOK_DEC
) {
4781 } else if (tok
== '.' || tok
== TOK_ARROW
|| tok
== TOK_CDOUBLE
) {
4784 if (tok
== TOK_ARROW
)
4786 qualifiers
= vtop
->type
.t
& (VT_CONSTANT
| VT_VOLATILE
);
4789 /* expect pointer on structure */
4790 if ((vtop
->type
.t
& VT_BTYPE
) != VT_STRUCT
)
4791 expect("struct or union");
4792 if (tok
== TOK_CDOUBLE
)
4793 expect("field name");
4795 if (tok
== TOK_CINT
|| tok
== TOK_CUINT
)
4796 expect("field name");
4797 s
= find_field(&vtop
->type
, tok
);
4799 tcc_error("field not found: %s", get_tok_str(tok
& ~SYM_FIELD
, &tokc
));
4800 /* add field offset to pointer */
4801 vtop
->type
= char_pointer_type
; /* change type to 'char *' */
4804 /* change type to field type, and set to lvalue */
4805 vtop
->type
= s
->type
;
4806 vtop
->type
.t
|= qualifiers
;
4807 /* an array is never an lvalue */
4808 if (!(vtop
->type
.t
& VT_ARRAY
)) {
4809 vtop
->r
|= lvalue_type(vtop
->type
.t
);
4810 #ifdef CONFIG_TCC_BCHECK
4811 /* if bound checking, the referenced pointer must be checked */
4812 if (tcc_state
->do_bounds_check
&& (vtop
->r
& VT_VALMASK
) != VT_LOCAL
)
4813 vtop
->r
|= VT_MUSTBOUND
;
4817 } else if (tok
== '[') {
4823 } else if (tok
== '(') {
4826 int nb_args
, ret_nregs
, ret_align
, regsize
, variadic
;
4829 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
4830 /* pointer test (no array accepted) */
4831 if ((vtop
->type
.t
& (VT_BTYPE
| VT_ARRAY
)) == VT_PTR
) {
4832 vtop
->type
= *pointed_type(&vtop
->type
);
4833 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
)
4837 expect("function pointer");
4840 vtop
->r
&= ~VT_LVAL
; /* no lvalue */
4842 /* get return type */
4845 sa
= s
->next
; /* first parameter */
4848 /* compute first implicit argument if a structure is returned */
4849 if ((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
4850 variadic
= (s
->c
== FUNC_ELLIPSIS
);
4851 ret_nregs
= gfunc_sret(&s
->type
, variadic
, &ret
.type
,
4852 &ret_align
, ®size
);
4854 /* get some space for the returned structure */
4855 size
= type_size(&s
->type
, &align
);
4856 #ifdef TCC_TARGET_ARM64
4857 /* On arm64, a small struct is return in registers.
4858 It is much easier to write it to memory if we know
4859 that we are allowed to write some extra bytes, so
4860 round the allocated space up to a power of 2: */
4862 while (size
& (size
- 1))
4863 size
= (size
| (size
- 1)) + 1;
4865 loc
= (loc
- size
) & -align
;
4867 ret
.r
= VT_LOCAL
| VT_LVAL
;
4868 /* pass it as 'int' to avoid structure arg passing
4870 vseti(VT_LOCAL
, loc
);
4880 /* return in register */
4881 if (is_float(ret
.type
.t
)) {
4882 ret
.r
= reg_fret(ret
.type
.t
);
4883 #ifdef TCC_TARGET_X86_64
4884 if ((ret
.type
.t
& VT_BTYPE
) == VT_QFLOAT
)
4888 #ifndef TCC_TARGET_ARM64
4889 #ifdef TCC_TARGET_X86_64
4890 if ((ret
.type
.t
& VT_BTYPE
) == VT_QLONG
)
4892 if ((ret
.type
.t
& VT_BTYPE
) == VT_LLONG
)
4903 gfunc_param_typed(s
, sa
);
4913 tcc_error("too few arguments to function");
4915 if (!nocode_wanted
) {
4916 gfunc_call(nb_args
);
4918 vtop
-= (nb_args
+ 1);
4922 for (r
= ret
.r
+ ret_nregs
+ !ret_nregs
; r
-- > ret
.r
;) {
4923 vsetc(&ret
.type
, r
, &ret
.c
);
4924 vtop
->r2
= ret
.r2
; /* Loop only happens when r2 is VT_CONST */
4927 /* handle packed struct return */
4928 if (((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) && ret_nregs
) {
4931 size
= type_size(&s
->type
, &align
);
4932 /* We're writing whole regs often, make sure there's enough
4933 space. Assume register size is power of 2. */
4934 if (regsize
> align
)
4936 loc
= (loc
- size
) & -align
;
4940 vset(&ret
.type
, VT_LOCAL
| VT_LVAL
, addr
+ offset
);
4944 if (--ret_nregs
== 0)
4948 vset(&s
->type
, VT_LOCAL
| VT_LVAL
, addr
);
4956 ST_FUNC
void expr_prod(void)
4961 while (tok
== '*' || tok
== '/' || tok
== '%') {
4969 ST_FUNC
void expr_sum(void)
4974 while (tok
== '+' || tok
== '-') {
4982 static void expr_shift(void)
4987 while (tok
== TOK_SHL
|| tok
== TOK_SAR
) {
4995 static void expr_cmp(void)
5000 while ((tok
>= TOK_ULE
&& tok
<= TOK_GT
) ||
5001 tok
== TOK_ULT
|| tok
== TOK_UGE
) {
5009 static void expr_cmpeq(void)
5014 while (tok
== TOK_EQ
|| tok
== TOK_NE
) {
5022 static void expr_and(void)
5025 while (tok
== '&') {
5032 static void expr_xor(void)
5035 while (tok
== '^') {
5042 static void expr_or(void)
5045 while (tok
== '|') {
5052 /* XXX: fix this mess */
5053 static void expr_land_const(void)
5056 while (tok
== TOK_LAND
) {
5062 static void expr_lor_const(void)
5065 while (tok
== TOK_LOR
) {
5072 static void expr_land(void)
5075 if (tok
== TOK_LAND
) {
5078 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
5085 int saved_nocode_wanted
= nocode_wanted
;
5087 while (tok
== TOK_LAND
) {
5094 nocode_wanted
= saved_nocode_wanted
;
5095 gen_cast(&int_type
);
5103 if (tok
!= TOK_LAND
) {
5116 static void expr_lor(void)
5119 if (tok
== TOK_LOR
) {
5122 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
5129 int saved_nocode_wanted
= nocode_wanted
;
5131 while (tok
== TOK_LOR
) {
5138 nocode_wanted
= saved_nocode_wanted
;
5139 gen_cast(&int_type
);
5147 if (tok
!= TOK_LOR
) {
5160 /* Assuming vtop is a value used in a conditional context
5161 (i.e. compared with zero) return 0 if it's false, 1 if
5162 true and -1 if it can't be statically determined. */
5163 static int condition_3way(void)
5166 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
&&
5167 (!(vtop
->r
& VT_SYM
) ||
5168 !(vtop
->sym
->type
.t
& VT_WEAK
))) {
5170 boolean
.t
= VT_BOOL
;
5179 static void expr_cond(void)
5181 int tt
, u
, r1
, r2
, rc
, t1
, t2
, bt1
, bt2
, islv
;
5184 CType type
, type1
, type2
;
5189 c
= condition_3way();
5191 int saved_nocode_wanted
= nocode_wanted
;
5193 if (tok
!= ':' || !gnu_ext
) {
5201 nocode_wanted
= saved_nocode_wanted
;
5204 if (tok
!= ':' || !gnu_ext
) {
5208 nocode_wanted
= saved_nocode_wanted
;
5215 /* XXX This doesn't handle nocode_wanted correctly at all.
5216 It unconditionally calls gv/gvtst and friends. That's
5217 the case for many of the expr_ routines. Currently
5218 that should generate only useless code, but depending
5219 on other operand handling this might also generate
5220 pointer derefs for lvalue conversions whose result
5221 is useless, but nevertheless can lead to segfault.
5223 Somewhen we need to overhaul the whole nocode_wanted
5225 if (vtop
!= vstack
) {
5226 /* needed to avoid having different registers saved in
5228 if (is_float(vtop
->type
.t
)) {
5230 #ifdef TCC_TARGET_X86_64
5231 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
5241 if (tok
== ':' && gnu_ext
) {
5249 sv
= *vtop
; /* save value to handle it later */
5250 vtop
--; /* no vpop so that FP stack is not flushed */
5258 bt1
= t1
& VT_BTYPE
;
5260 bt2
= t2
& VT_BTYPE
;
5261 /* cast operands to correct type according to ISOC rules */
5262 if (is_float(bt1
) || is_float(bt2
)) {
5263 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
5264 type
.t
= VT_LDOUBLE
;
5265 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
5270 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
5271 /* cast to biggest op */
5273 /* convert to unsigned if it does not fit in a long long */
5274 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
5275 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
5276 type
.t
|= VT_UNSIGNED
;
5277 } else if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
5278 /* If one is a null ptr constant the result type
5280 if (is_null_pointer (vtop
))
5282 else if (is_null_pointer (&sv
))
5284 /* XXX: test pointer compatibility, C99 has more elaborate
5288 } else if (bt1
== VT_FUNC
|| bt2
== VT_FUNC
) {
5289 /* XXX: test function pointer compatibility */
5290 type
= bt1
== VT_FUNC
? type1
: type2
;
5291 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
5292 /* XXX: test structure compatibility */
5293 type
= bt1
== VT_STRUCT
? type1
: type2
;
5294 } else if (bt1
== VT_VOID
|| bt2
== VT_VOID
) {
5295 /* NOTE: as an extension, we accept void on only one side */
5298 /* integer operations */
5300 /* convert to unsigned if it does not fit in an integer */
5301 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
5302 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
5303 type
.t
|= VT_UNSIGNED
;
5305 /* keep structs lvalue by transforming `(expr ? a : b)` to `*(expr ? &a : &b)` so
5306 that `(expr ? a : b).mem` does not error with "lvalue expected" */
5307 islv
= (vtop
->r
& VT_LVAL
) && (sv
.r
& VT_LVAL
) && VT_STRUCT
== (type
.t
& VT_BTYPE
);
5309 /* now we convert second operand */
5312 mk_pointer(&vtop
->type
);
5315 else if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
5318 if (is_float(type
.t
)) {
5320 #ifdef TCC_TARGET_X86_64
5321 if ((type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
5325 } else if ((type
.t
& VT_BTYPE
) == VT_LLONG
) {
5326 /* for long longs, we use fixed registers to avoid having
5327 to handle a complicated move */
5332 /* this is horrible, but we must also convert first
5336 /* put again first value and cast it */
5340 mk_pointer(&vtop
->type
);
5343 else if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
5346 move_reg(r2
, r1
, type
.t
);
5355 static void expr_eq(void)
5361 (tok
>= TOK_A_MOD
&& tok
<= TOK_A_DIV
) ||
5362 tok
== TOK_A_XOR
|| tok
== TOK_A_OR
||
5363 tok
== TOK_A_SHL
|| tok
== TOK_A_SAR
) {
5378 ST_FUNC
void gexpr(void)
5389 /* parse an expression and return its type without any side effect. */
5390 static void expr_type(CType
*type
)
5392 int saved_nocode_wanted
;
5394 saved_nocode_wanted
= nocode_wanted
;
5399 nocode_wanted
= saved_nocode_wanted
;
5402 /* parse a unary expression and return its type without any side
5404 static void unary_type(CType
*type
)
5416 /* parse a constant expression and return value in vtop. */
5417 static void expr_const1(void)
5426 /* parse an integer constant and return its value. */
5427 static inline int64_t expr_const64(void)
5431 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
5432 expect("constant expression");
5438 /* parse an integer constant and return its value.
5439 Complain if it doesn't fit 32bit (signed or unsigned). */
5440 ST_FUNC
int expr_const(void)
5443 int64_t wc
= expr_const64();
5445 if (c
!= wc
&& (unsigned)c
!= wc
)
5446 tcc_error("constant exceeds 32 bit");
5450 /* return the label token if current token is a label, otherwise
5452 static int is_label(void)
5456 /* fast test first */
5457 if (tok
< TOK_UIDENT
)
5459 /* no need to save tokc because tok is an identifier */
5466 unget_tok(last_tok
);
5471 static void label_or_decl(int l
)
5475 /* fast test first */
5476 if (tok
>= TOK_UIDENT
)
5478 /* no need to save tokc because tok is an identifier */
5482 unget_tok(last_tok
);
5485 unget_tok(last_tok
);
5490 static int case_cmp(const void *pa
, const void *pb
)
5492 int64_t a
= (*(struct case_t
**) pa
)->v1
;
5493 int64_t b
= (*(struct case_t
**) pb
)->v1
;
5494 return a
< b
? -1 : a
> b
;
5497 static void gcase(struct case_t
**base
, int len
, int *bsym
)
5501 int ll
= (vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
;
5519 gtst_addr(0, p
->sym
); /* v1 <= x <= v2 */
5521 gcase(base
, len
/2, bsym
);
5522 if (cur_switch
->def_sym
)
5523 gjmp_addr(cur_switch
->def_sym
);
5525 *bsym
= gjmp(*bsym
);
5529 base
+= e
; len
-= e
;
5539 if (p
->v1
== p
->v2
) {
5541 gtst_addr(0, p
->sym
);
5551 gtst_addr(0, p
->sym
);
5557 static void block(int *bsym
, int *csym
, int is_expr
)
5559 int a
, b
, c
, d
, cond
;
5562 /* generate line number info */
5563 if (tcc_state
->do_debug
&&
5564 (last_line_num
!= file
->line_num
|| last_ind
!= ind
)) {
5565 put_stabn(N_SLINE
, 0, file
->line_num
, ind
- func_ind
);
5567 last_line_num
= file
->line_num
;
5571 /* default return value is (void) */
5573 vtop
->type
.t
= VT_VOID
;
5576 if (tok
== TOK_IF
) {
5578 int saved_nocode_wanted
= nocode_wanted
;
5583 cond
= condition_3way();
5587 block(bsym
, csym
, 0);
5589 nocode_wanted
= saved_nocode_wanted
;
5591 if (c
== TOK_ELSE
) {
5597 block(bsym
, csym
, 0);
5598 gsym(d
); /* patch else jmp */
5600 nocode_wanted
= saved_nocode_wanted
;
5603 } else if (tok
== TOK_WHILE
) {
5604 int saved_nocode_wanted
;
5605 nocode_wanted
&= ~2;
5615 saved_nocode_wanted
= nocode_wanted
;
5617 nocode_wanted
= saved_nocode_wanted
;
5623 } else if (tok
== '{') {
5625 int block_vla_sp_loc
= vla_sp_loc
, saved_vlas_in_scope
= vlas_in_scope
;
5628 /* record local declaration stack position */
5630 llabel
= local_label_stack
;
5633 /* handle local labels declarations */
5634 if (tok
== TOK_LABEL
) {
5637 if (tok
< TOK_UIDENT
)
5638 expect("label identifier");
5639 label_push(&local_label_stack
, tok
, LABEL_DECLARED
);
5649 while (tok
!= '}') {
5650 label_or_decl(VT_LOCAL
);
5654 block(bsym
, csym
, is_expr
);
5657 /* pop locally defined labels */
5658 label_pop(&local_label_stack
, llabel
);
5659 /* pop locally defined symbols */
5661 /* In the is_expr case (a statement expression is finished here),
5662 vtop might refer to symbols on the local_stack. Either via the
5663 type or via vtop->sym. We can't pop those nor any that in turn
5664 might be referred to. To make it easier we don't roll back
5665 any symbols in that case; some upper level call to block() will
5666 do that. We do have to remove such symbols from the lookup
5667 tables, though. sym_pop will do that. */
5668 sym_pop(&local_stack
, s
, is_expr
);
5670 /* Pop VLA frames and restore stack pointer if required */
5671 if (vlas_in_scope
> saved_vlas_in_scope
) {
5672 vla_sp_loc
= saved_vlas_in_scope
? block_vla_sp_loc
: vla_sp_root_loc
;
5675 vlas_in_scope
= saved_vlas_in_scope
;
5678 } else if (tok
== TOK_RETURN
) {
5682 gen_assign_cast(&func_vt
);
5683 #ifdef TCC_TARGET_ARM64
5684 // Perhaps it would be better to use this for all backends:
5687 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
5688 CType type
, ret_type
;
5689 int ret_align
, ret_nregs
, regsize
;
5690 ret_nregs
= gfunc_sret(&func_vt
, func_var
, &ret_type
,
5691 &ret_align
, ®size
);
5692 if (0 == ret_nregs
) {
5693 /* if returning structure, must copy it to implicit
5694 first pointer arg location */
5697 vset(&type
, VT_LOCAL
| VT_LVAL
, func_vc
);
5700 /* copy structure value to pointer */
5703 /* returning structure packed into registers */
5704 int r
, size
, addr
, align
;
5705 size
= type_size(&func_vt
,&align
);
5706 if ((vtop
->r
!= (VT_LOCAL
| VT_LVAL
) ||
5707 (vtop
->c
.i
& (ret_align
-1)))
5708 && (align
& (ret_align
-1))) {
5709 loc
= (loc
- size
) & -ret_align
;
5712 vset(&type
, VT_LOCAL
| VT_LVAL
, addr
);
5716 vset(&ret_type
, VT_LOCAL
| VT_LVAL
, addr
);
5718 vtop
->type
= ret_type
;
5719 if (is_float(ret_type
.t
))
5720 r
= rc_fret(ret_type
.t
);
5731 if (--ret_nregs
== 0)
5733 /* We assume that when a structure is returned in multiple
5734 registers, their classes are consecutive values of the
5737 vtop
->c
.i
+= regsize
;
5741 } else if (is_float(func_vt
.t
)) {
5742 gv(rc_fret(func_vt
.t
));
5747 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
5750 /* jump unless last stmt in top-level block */
5751 if (tok
!= '}' || local_scope
!= 1)
5754 } else if (tok
== TOK_BREAK
) {
5757 tcc_error("cannot break");
5758 *bsym
= gjmp(*bsym
);
5762 } else if (tok
== TOK_CONTINUE
) {
5765 tcc_error("cannot continue");
5766 vla_sp_restore_root();
5767 *csym
= gjmp(*csym
);
5770 } else if (tok
== TOK_FOR
) {
5772 int saved_nocode_wanted
;
5773 nocode_wanted
&= ~2;
5779 /* c99 for-loop init decl? */
5780 if (!decl0(VT_LOCAL
, 1)) {
5781 /* no, regular for-loop init expr */
5807 saved_nocode_wanted
= nocode_wanted
;
5809 nocode_wanted
= saved_nocode_wanted
;
5815 sym_pop(&local_stack
, s
, 0);
5818 if (tok
== TOK_DO
) {
5819 int saved_nocode_wanted
;
5820 nocode_wanted
&= ~2;
5826 saved_nocode_wanted
= nocode_wanted
;
5828 nocode_wanted
= saved_nocode_wanted
;
5840 if (tok
== TOK_SWITCH
) {
5841 struct switch_t
*saved
, sw
;
5842 int saved_nocode_wanted
= nocode_wanted
;
5848 switchval
= *vtop
--;
5850 b
= gjmp(0); /* jump to first case */
5851 sw
.p
= NULL
; sw
.n
= 0; sw
.def_sym
= 0;
5855 nocode_wanted
= saved_nocode_wanted
;
5856 a
= gjmp(a
); /* add implicit break */
5859 if (!nocode_wanted
) {
5860 qsort(sw
.p
, sw
.n
, sizeof(void*), case_cmp
);
5861 for (b
= 1; b
< sw
.n
; b
++)
5862 if (sw
.p
[b
- 1]->v2
>= sw
.p
[b
]->v1
)
5863 tcc_error("duplicate case value");
5864 /* Our switch table sorting is signed, so the compared
5865 value needs to be as well when it's 64bit. */
5866 if ((switchval
.type
.t
& VT_BTYPE
) == VT_LLONG
)
5867 switchval
.type
.t
&= ~VT_UNSIGNED
;
5869 gcase(sw
.p
, sw
.n
, &a
);
5872 gjmp_addr(sw
.def_sym
);
5874 dynarray_reset(&sw
.p
, &sw
.n
);
5879 if (tok
== TOK_CASE
) {
5880 struct case_t
*cr
= tcc_malloc(sizeof(struct case_t
));
5883 nocode_wanted
&= ~2;
5885 cr
->v1
= cr
->v2
= expr_const64();
5886 if (gnu_ext
&& tok
== TOK_DOTS
) {
5888 cr
->v2
= expr_const64();
5889 if (cr
->v2
< cr
->v1
)
5890 tcc_warning("empty case range");
5893 dynarray_add((void***) &cur_switch
->p
, &cur_switch
->n
, cr
);
5896 goto block_after_label
;
5898 if (tok
== TOK_DEFAULT
) {
5903 if (cur_switch
->def_sym
)
5904 tcc_error("too many 'default'");
5905 cur_switch
->def_sym
= ind
;
5907 goto block_after_label
;
5909 if (tok
== TOK_GOTO
) {
5911 if (tok
== '*' && gnu_ext
) {
5915 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
)
5921 } else if (tok
>= TOK_UIDENT
) {
5922 s
= label_find(tok
);
5923 /* put forward definition if needed */
5925 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
5927 if (s
->r
== LABEL_DECLARED
)
5928 s
->r
= LABEL_FORWARD
;
5930 vla_sp_restore_root();
5933 else if (s
->r
& LABEL_FORWARD
)
5934 s
->jnext
= gjmp(s
->jnext
);
5936 gjmp_addr(s
->jnext
);
5939 expect("label identifier");
5942 } else if (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
) {
5950 if (s
->r
== LABEL_DEFINED
)
5951 tcc_error("duplicate label '%s'", get_tok_str(s
->v
, NULL
));
5953 s
->r
= LABEL_DEFINED
;
5955 s
= label_push(&global_label_stack
, b
, LABEL_DEFINED
);
5959 /* we accept this, but it is a mistake */
5961 nocode_wanted
&= ~2;
5963 tcc_warning("deprecated use of label at end of compound statement");
5967 block(bsym
, csym
, is_expr
);
5970 /* expression case */
5985 #define EXPR_CONST 1
5988 static void parse_init_elem(int expr_type
)
5990 int saved_global_expr
;
5993 /* compound literals must be allocated globally in this case */
5994 saved_global_expr
= global_expr
;
5997 global_expr
= saved_global_expr
;
5998 /* NOTE: symbols are accepted */
5999 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) != VT_CONST
)
6000 tcc_error("initializer element is not constant");
6008 /* t is the array or struct type. c is the array or struct
6009 address. cur_field is the pointer to the current
6010 value, for arrays the 'c' member contains the current start
6011 index and the 'r' contains the end index (in case of range init).
6012 'size_only' is true if only size info is needed (only used
6014 static void decl_designator(CType
*type
, Section
*sec
, unsigned long c
,
6015 Sym
**cur_field
, int size_only
)
6018 int notfirst
, index
, index_last
, align
, l
, nb_elems
, elem_size
;
6024 if (gnu_ext
&& (l
= is_label()) != 0)
6026 while (tok
== '[' || tok
== '.') {
6028 if (!(type
->t
& VT_ARRAY
))
6029 expect("array type");
6032 index
= expr_const();
6033 if (index
< 0 || (s
->c
>= 0 && index
>= s
->c
))
6034 tcc_error("invalid index");
6035 if (tok
== TOK_DOTS
&& gnu_ext
) {
6037 index_last
= expr_const();
6038 if (index_last
< 0 ||
6039 (s
->c
>= 0 && index_last
>= s
->c
) ||
6041 tcc_error("invalid index");
6047 (*cur_field
)->c
= index
;
6048 (*cur_field
)->r
= index_last
;
6050 type
= pointed_type(type
);
6051 elem_size
= type_size(type
, &align
);
6052 c
+= index
* elem_size
;
6053 /* NOTE: we only support ranges for last designator */
6054 nb_elems
= index_last
- index
+ 1;
6055 if (nb_elems
!= 1) {
6064 if ((type
->t
& VT_BTYPE
) != VT_STRUCT
)
6065 expect("struct/union type");
6066 f
= find_field(type
, l
);
6071 /* XXX: fix this mess by using explicit storage field */
6073 type1
.t
|= (type
->t
& ~VT_TYPE
);
6087 if (type
->t
& VT_ARRAY
) {
6088 index
= (*cur_field
)->c
;
6089 if (type
->ref
->c
>= 0 && index
>= type
->ref
->c
)
6090 tcc_error("index too large");
6091 type
= pointed_type(type
);
6092 c
+= index
* type_size(type
, &align
);
6096 tcc_error("too many field init");
6097 /* XXX: fix this mess by using explicit storage field */
6099 type1
.t
|= (type
->t
& ~VT_TYPE
);
6104 decl_initializer(type
, sec
, c
, 0, size_only
);
6106 /* XXX: make it more general */
6107 if (!size_only
&& nb_elems
> 1) {
6108 unsigned long c_end
;
6113 vset(type
, VT_LOCAL
|VT_LVAL
, c
);
6114 for (i
= 1; i
< nb_elems
; i
++) {
6115 vset(type
, VT_LOCAL
|VT_LVAL
, c
+ elem_size
* i
);
6121 c_end
= c
+ nb_elems
* elem_size
;
6122 if (c_end
> sec
->data_allocated
)
6123 section_realloc(sec
, c_end
);
6124 src
= sec
->data
+ c
;
6126 for(i
= 1; i
< nb_elems
; i
++) {
6128 memcpy(dst
, src
, elem_size
);
6134 /* store a value or an expression directly in global data or in local array */
6135 static void init_putv(CType
*type
, Section
*sec
, unsigned long c
)
6137 int bt
, bit_pos
, bit_size
;
6139 unsigned long long bit_mask
;
6143 dtype
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
6147 /* XXX: not portable */
6148 /* XXX: generate error if incorrect relocation */
6149 gen_assign_cast(&dtype
);
6150 bt
= type
->t
& VT_BTYPE
;
6151 size
= type_size(type
, &align
);
6152 if (c
+ size
> sec
->data_allocated
) {
6153 section_realloc(sec
, c
+ size
);
6155 ptr
= sec
->data
+ c
;
6156 /* XXX: make code faster ? */
6157 if (!(type
->t
& VT_BITFIELD
)) {
6159 bit_size
= PTR_SIZE
* 8;
6162 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
6163 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
6164 bit_mask
= (1LL << bit_size
) - 1;
6166 if ((vtop
->r
& (VT_SYM
|VT_CONST
)) == (VT_SYM
|VT_CONST
) &&
6167 vtop
->sym
->v
>= SYM_FIRST_ANOM
&&
6168 /* XXX This rejects compount literals like
6169 '(void *){ptr}'. The problem is that '&sym' is
6170 represented the same way, which would be ruled out
6171 by the SYM_FIRST_ANOM check above, but also '"string"'
6172 in 'char *p = "string"' is represented the same
6173 with the type being VT_PTR and the symbol being an
6174 anonymous one. That is, there's no difference in vtop
6175 between '(void *){x}' and '&(void *){x}'. Ignore
6176 pointer typed entities here. Hopefully no real code
6177 will every use compound literals with scalar type. */
6178 (vtop
->type
.t
& VT_BTYPE
) != VT_PTR
) {
6179 /* These come from compound literals, memcpy stuff over. */
6183 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[vtop
->sym
->c
];
6184 ssec
= tcc_state
->sections
[esym
->st_shndx
];
6185 memmove (ptr
, ssec
->data
+ esym
->st_value
, size
);
6187 /* We need to copy over all memory contents, and that
6188 includes relocations. Use the fact that relocs are
6189 created it order, so look from the end of relocs
6190 until we hit one before the copied region. */
6191 int num_relocs
= ssec
->reloc
->data_offset
/ sizeof(*rel
);
6192 rel
= (ElfW_Rel
*)(ssec
->reloc
->data
+ ssec
->reloc
->data_offset
);
6193 while (num_relocs
--) {
6195 if (rel
->r_offset
>= esym
->st_value
+ size
)
6197 if (rel
->r_offset
< esym
->st_value
)
6199 /* Note: if the same fields are initialized multiple
6200 times (possible with designators) then we possibly
6201 add multiple relocations for the same offset here.
6202 That would lead to wrong code, the last reloc needs
6203 to win. We clean this up later after the whole
6204 initializer is parsed. */
6205 put_elf_reloca(symtab_section
, sec
,
6206 c
+ rel
->r_offset
- esym
->st_value
,
6207 ELFW(R_TYPE
)(rel
->r_info
),
6208 ELFW(R_SYM
)(rel
->r_info
),
6209 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
6218 if ((vtop
->r
& VT_SYM
) &&
6224 (bt
== VT_LLONG
&& bit_size
!= 64) ||
6228 (bt
== VT_INT
&& bit_size
!= 32)
6231 tcc_error("initializer element is not computable at load time");
6233 /* XXX: when cross-compiling we assume that each type has the
6234 same representation on host and target, which is likely to
6235 be wrong in the case of long double */
6237 vtop
->c
.i
= (vtop
->c
.i
!= 0);
6239 *(char *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
6242 *(short *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
6245 *(double *)ptr
= vtop
->c
.d
;
6248 if (sizeof(long double) == LDOUBLE_SIZE
)
6249 *(long double *)ptr
= vtop
->c
.ld
;
6250 else if (sizeof(double) == LDOUBLE_SIZE
)
6251 *(double *)ptr
= vtop
->c
.ld
;
6253 tcc_error("can't cross compile long double constants");
6257 *(long long *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
6264 addr_t val
= (vtop
->c
.i
& bit_mask
) << bit_pos
;
6265 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
6266 if (vtop
->r
& VT_SYM
)
6267 greloca(sec
, vtop
->sym
, c
, R_DATA_PTR
, val
);
6269 *(addr_t
*)ptr
|= val
;
6271 if (vtop
->r
& VT_SYM
)
6272 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
6273 *(addr_t
*)ptr
|= val
;
6279 int val
= (vtop
->c
.i
& bit_mask
) << bit_pos
;
6280 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
6281 if (vtop
->r
& VT_SYM
)
6282 greloca(sec
, vtop
->sym
, c
, R_DATA_PTR
, val
);
6286 if (vtop
->r
& VT_SYM
)
6287 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
6296 vset(&dtype
, VT_LOCAL
|VT_LVAL
, c
);
6303 /* put zeros for variable based init */
6304 static void init_putz(Section
*sec
, unsigned long c
, int size
)
6307 /* nothing to do because globals are already set to zero */
6309 vpush_global_sym(&func_old_type
, TOK_memset
);
6311 #ifdef TCC_TARGET_ARM
6322 /* 't' contains the type and storage info. 'c' is the offset of the
6323 object in section 'sec'. If 'sec' is NULL, it means stack based
6324 allocation. 'first' is true if array '{' must be read (multi
6325 dimension implicit array init handling). 'size_only' is true if
6326 size only evaluation is wanted (only for arrays). */
6327 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
,
6328 int first
, int size_only
)
6330 int index
, array_length
, n
, no_oblock
, nb
, parlevel
, parlevel1
, i
;
6337 /* If we currently are at an '}' or ',' we have read an initializer
6338 element in one of our callers, and not yet consumed it. */
6339 have_elem
= tok
== '}' || tok
== ',';
6340 if (!have_elem
&& tok
!= '{' &&
6341 /* In case of strings we have special handling for arrays, so
6342 don't consume them as initializer value (which would commit them
6343 to some anonymous symbol). */
6344 tok
!= TOK_LSTR
&& tok
!= TOK_STR
&&
6346 parse_init_elem(!sec
? EXPR_ANY
: EXPR_CONST
);
6351 !(type
->t
& VT_ARRAY
) &&
6352 /* Use i_c_parameter_t, to strip toplevel qualifiers.
6353 The source type might have VT_CONSTANT set, which is
6354 of course assignable to non-const elements. */
6355 is_compatible_parameter_types(type
, &vtop
->type
)) {
6356 init_putv(type
, sec
, c
);
6357 } else if (type
->t
& VT_ARRAY
) {
6361 t1
= pointed_type(type
);
6362 size1
= type_size(t1
, &align1
);
6365 if ((first
&& tok
!= TOK_LSTR
&& tok
!= TOK_STR
) ||
6368 tcc_error("character array initializer must be a literal,"
6369 " optionally enclosed in braces");
6374 /* only parse strings here if correct type (otherwise: handle
6375 them as ((w)char *) expressions */
6376 if ((tok
== TOK_LSTR
&&
6377 #ifdef TCC_TARGET_PE
6378 (t1
->t
& VT_BTYPE
) == VT_SHORT
&& (t1
->t
& VT_UNSIGNED
)
6380 (t1
->t
& VT_BTYPE
) == VT_INT
6382 ) || (tok
== TOK_STR
&& (t1
->t
& VT_BTYPE
) == VT_BYTE
)) {
6383 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
6386 /* compute maximum number of chars wanted */
6388 cstr_len
= tokc
.str
.size
;
6390 cstr_len
= tokc
.str
.size
/ sizeof(nwchar_t
);
6393 if (n
>= 0 && nb
> (n
- array_length
))
6394 nb
= n
- array_length
;
6397 tcc_warning("initializer-string for array is too long");
6398 /* in order to go faster for common case (char
6399 string in global variable, we handle it
6401 if (sec
&& tok
== TOK_STR
&& size1
== 1) {
6402 memcpy(sec
->data
+ c
+ array_length
, tokc
.str
.data
, nb
);
6406 ch
= ((unsigned char *)tokc
.str
.data
)[i
];
6408 ch
= ((nwchar_t
*)tokc
.str
.data
)[i
];
6410 init_putv(t1
, sec
, c
+ (array_length
+ i
) * size1
);
6417 /* only add trailing zero if enough storage (no
6418 warning in this case since it is standard) */
6419 if (n
< 0 || array_length
< n
) {
6422 init_putv(t1
, sec
, c
+ (array_length
* size1
));
6432 while (tok
!= '}' || have_elem
) {
6433 decl_designator(type
, sec
, c
, &f
, size_only
);
6436 /* must put zero in holes (note that doing it that way
6437 ensures that it even works with designators) */
6438 if (!size_only
&& array_length
< index
) {
6439 init_putz(sec
, c
+ array_length
* size1
,
6440 (index
- array_length
) * size1
);
6442 if (type
->t
& VT_ARRAY
) {
6443 index
= indexsym
.c
= ++indexsym
.r
;
6445 index
= index
+ type_size(&f
->type
, &align1
);
6446 if (s
->type
.t
== TOK_UNION
)
6451 if (index
> array_length
)
6452 array_length
= index
;
6454 if (type
->t
& VT_ARRAY
) {
6455 /* special test for multi dimensional arrays (may not
6456 be strictly correct if designators are used at the
6458 if (no_oblock
&& index
>= n
)
6461 if (no_oblock
&& f
== NULL
)
6469 /* put zeros at the end */
6470 if (!size_only
&& array_length
< n
) {
6471 init_putz(sec
, c
+ array_length
* size1
,
6472 (n
- array_length
) * size1
);
6476 /* patch type size if needed, which happens only for array types */
6478 s
->c
= array_length
;
6479 } else if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
6482 if (first
|| tok
== '{') {
6491 } else if (tok
== '{') {
6493 decl_initializer(type
, sec
, c
, first
, size_only
);
6495 } else if (size_only
) {
6496 /* If we supported only ISO C we wouldn't have to accept calling
6497 this on anything than an array size_only==1 (and even then
6498 only on the outermost level, so no recursion would be needed),
6499 because initializing a flex array member isn't supported.
6500 But GNU C supports it, so we need to recurse even into
6501 subfields of structs and arrays when size_only is set. */
6502 /* just skip expression */
6503 parlevel
= parlevel1
= 0;
6504 while ((parlevel
> 0 || parlevel1
> 0 ||
6505 (tok
!= '}' && tok
!= ',')) && tok
!= -1) {
6508 else if (tok
== ')') {
6509 if (parlevel
== 0 && parlevel1
== 0)
6513 else if (tok
== '{')
6515 else if (tok
== '}') {
6516 if (parlevel
== 0 && parlevel1
== 0)
6524 /* This should happen only when we haven't parsed
6525 the init element above for fear of committing a
6526 string constant to memory too early. */
6527 if (tok
!= TOK_STR
&& tok
!= TOK_LSTR
)
6528 expect("string constant");
6529 parse_init_elem(!sec
? EXPR_ANY
: EXPR_CONST
);
6531 init_putv(type
, sec
, c
);
6535 /* parse an initializer for type 't' if 'has_init' is non zero, and
6536 allocate space in local or global data space ('r' is either
6537 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
6538 variable 'v' of scope 'scope' is declared before initializers
6539 are parsed. If 'v' is zero, then a reference to the new object
6540 is put in the value stack. If 'has_init' is 2, a special parsing
6541 is done to handle string constants. */
6542 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
,
6543 int has_init
, int v
, int scope
)
6545 int size
, align
, addr
, data_offset
;
6547 ParseState saved_parse_state
= {0};
6548 TokenString
*init_str
= NULL
;
6550 Sym
*flexible_array
;
6552 flexible_array
= NULL
;
6553 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
6554 Sym
*field
= type
->ref
->next
;
6557 field
= field
->next
;
6558 if (field
->type
.t
& VT_ARRAY
&& field
->type
.ref
->c
< 0)
6559 flexible_array
= field
;
6563 size
= type_size(type
, &align
);
6564 /* If unknown size, we must evaluate it before
6565 evaluating initializers because
6566 initializers can generate global data too
6567 (e.g. string pointers or ISOC99 compound
6568 literals). It also simplifies local
6569 initializers handling */
6570 if (size
< 0 || (flexible_array
&& has_init
)) {
6572 tcc_error("unknown type size");
6573 /* get all init string */
6574 init_str
= tok_str_alloc();
6575 if (has_init
== 2) {
6576 /* only get strings */
6577 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
6578 tok_str_add_tok(init_str
);
6583 while (level
> 0 || (tok
!= ',' && tok
!= ';')) {
6585 tcc_error("unexpected end of file in initializer");
6586 tok_str_add_tok(init_str
);
6589 else if (tok
== '}') {
6599 tok_str_add(init_str
, -1);
6600 tok_str_add(init_str
, 0);
6603 save_parse_state(&saved_parse_state
);
6605 begin_macro(init_str
, 1);
6607 decl_initializer(type
, NULL
, 0, 1, 1);
6608 /* prepare second initializer parsing */
6609 macro_ptr
= init_str
->str
;
6612 /* if still unknown size, error */
6613 size
= type_size(type
, &align
);
6615 tcc_error("unknown type size");
6617 /* If there's a flex member and it was used in the initializer
6619 if (flexible_array
&&
6620 flexible_array
->type
.ref
->c
> 0)
6621 size
+= flexible_array
->type
.ref
->c
6622 * pointed_size(&flexible_array
->type
);
6623 /* take into account specified alignment if bigger */
6624 if (ad
->a
.aligned
) {
6625 if (ad
->a
.aligned
> align
)
6626 align
= ad
->a
.aligned
;
6627 } else if (ad
->a
.packed
) {
6630 if ((r
& VT_VALMASK
) == VT_LOCAL
) {
6632 #ifdef CONFIG_TCC_BCHECK
6633 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
6637 loc
= (loc
- size
) & -align
;
6639 #ifdef CONFIG_TCC_BCHECK
6640 /* handles bounds */
6641 /* XXX: currently, since we do only one pass, we cannot track
6642 '&' operators, so we add only arrays */
6643 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
6645 /* add padding between regions */
6647 /* then add local bound info */
6648 bounds_ptr
= section_ptr_add(lbounds_section
, 2 * sizeof(addr_t
));
6649 bounds_ptr
[0] = addr
;
6650 bounds_ptr
[1] = size
;
6654 /* local variable */
6655 #ifdef CONFIG_TCC_ASM
6656 if (ad
->asm_label
) {
6657 int reg
= asm_parse_regvar(ad
->asm_label
);
6659 r
= (r
& ~VT_VALMASK
) | reg
;
6662 sym_push(v
, type
, r
, addr
);
6664 /* push local reference */
6665 vset(type
, r
, addr
);
6671 if (v
&& scope
== VT_CONST
) {
6672 /* see if the symbol was already defined */
6675 if (!is_compatible_types(&sym
->type
, type
))
6676 tcc_error("incompatible types for redefinition of '%s'",
6677 get_tok_str(v
, NULL
));
6678 if (sym
->type
.t
& VT_EXTERN
) {
6679 /* if the variable is extern, it was not allocated */
6680 sym
->type
.t
&= ~VT_EXTERN
;
6681 /* set array size if it was omitted in extern
6683 if ((sym
->type
.t
& VT_ARRAY
) &&
6684 sym
->type
.ref
->c
< 0 &&
6686 sym
->type
.ref
->c
= type
->ref
->c
;
6688 /* we accept several definitions of the same
6689 global variable. this is tricky, because we
6690 must play with the SHN_COMMON type of the symbol */
6691 /* XXX: should check if the variable was already
6692 initialized. It is incorrect to initialized it
6694 /* no init data, we won't add more to the symbol */
6701 /* allocate symbol in corresponding section */
6706 else if (tcc_state
->nocommon
)
6710 data_offset
= sec
->data_offset
;
6711 data_offset
= (data_offset
+ align
- 1) & -align
;
6713 /* very important to increment global pointer at this time
6714 because initializers themselves can create new initializers */
6715 data_offset
+= size
;
6716 #ifdef CONFIG_TCC_BCHECK
6717 /* add padding if bound check */
6718 if (tcc_state
->do_bounds_check
)
6721 sec
->data_offset
= data_offset
;
6722 /* allocate section space to put the data */
6723 if (sec
->sh_type
!= SHT_NOBITS
&&
6724 data_offset
> sec
->data_allocated
)
6725 section_realloc(sec
, data_offset
);
6726 /* align section if needed */
6727 if (align
> sec
->sh_addralign
)
6728 sec
->sh_addralign
= align
;
6730 addr
= 0; /* avoid warning */
6734 if (scope
!= VT_CONST
|| !sym
) {
6735 sym
= sym_push(v
, type
, r
| VT_SYM
, 0);
6736 sym
->asm_label
= ad
->asm_label
;
6738 /* update symbol definition */
6740 put_extern_sym(sym
, sec
, addr
, size
);
6743 /* put a common area */
6744 put_extern_sym(sym
, NULL
, align
, size
);
6745 /* XXX: find a nicer way */
6746 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
6747 esym
->st_shndx
= SHN_COMMON
;
6750 /* push global reference */
6751 sym
= get_sym_ref(type
, sec
, addr
, size
);
6752 vpushsym(type
, sym
);
6754 /* patch symbol weakness */
6755 if (type
->t
& VT_WEAK
)
6757 apply_visibility(sym
, type
);
6758 #ifdef CONFIG_TCC_BCHECK
6759 /* handles bounds now because the symbol must be defined
6760 before for the relocation */
6761 if (tcc_state
->do_bounds_check
) {
6764 greloc(bounds_section
, sym
, bounds_section
->data_offset
, R_DATA_PTR
);
6765 /* then add global bound info */
6766 bounds_ptr
= section_ptr_add(bounds_section
, 2 * sizeof(addr_t
));
6767 bounds_ptr
[0] = 0; /* relocated */
6768 bounds_ptr
[1] = size
;
6772 if (type
->t
& VT_VLA
) {
6775 /* save current stack pointer */
6776 if (vlas_in_scope
== 0) {
6777 if (vla_sp_root_loc
== -1)
6778 vla_sp_root_loc
= (loc
-= PTR_SIZE
);
6779 gen_vla_sp_save(vla_sp_root_loc
);
6782 vla_runtime_type_size(type
, &a
);
6783 gen_vla_alloc(type
, a
);
6784 gen_vla_sp_save(addr
);
6787 } else if (has_init
) {
6788 size_t oldreloc_offset
= 0;
6789 if (sec
&& sec
->reloc
)
6790 oldreloc_offset
= sec
->reloc
->data_offset
;
6791 decl_initializer(type
, sec
, addr
, 1, 0);
6792 if (sec
&& sec
->reloc
)
6793 squeeze_multi_relocs(sec
, oldreloc_offset
);
6794 /* patch flexible array member size back to -1, */
6795 /* for possible subsequent similar declarations */
6797 flexible_array
->type
.ref
->c
= -1;
6800 /* restore parse state if needed */
6803 restore_parse_state(&saved_parse_state
);
6807 static void put_func_debug(Sym
*sym
)
6812 /* XXX: we put here a dummy type */
6813 snprintf(buf
, sizeof(buf
), "%s:%c1",
6814 funcname
, sym
->type
.t
& VT_STATIC
? 'f' : 'F');
6815 put_stabs_r(buf
, N_FUN
, 0, file
->line_num
, 0,
6816 cur_text_section
, sym
->c
);
6817 /* //gr gdb wants a line at the function */
6818 put_stabn(N_SLINE
, 0, file
->line_num
, 0);
6823 /* parse an old style function declaration list */
6824 /* XXX: check multiple parameter */
6825 static void func_decl_list(Sym
*func_sym
)
6832 /* parse each declaration */
6833 while (tok
!= '{' && tok
!= ';' && tok
!= ',' && tok
!= TOK_EOF
&&
6834 tok
!= TOK_ASM1
&& tok
!= TOK_ASM2
&& tok
!= TOK_ASM3
) {
6835 if (!parse_btype(&btype
, &ad
))
6836 expect("declaration list");
6837 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
6838 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
6840 /* we accept no variable after */
6844 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
6845 /* find parameter in function parameter list */
6848 if ((s
->v
& ~SYM_FIELD
) == v
)
6852 tcc_error("declaration for parameter '%s' but no such parameter",
6853 get_tok_str(v
, NULL
));
6855 /* check that no storage specifier except 'register' was given */
6856 if (type
.t
& VT_STORAGE
)
6857 tcc_error("storage class specified for '%s'", get_tok_str(v
, NULL
));
6858 convert_parameter_type(&type
);
6859 /* we can add the type (NOTE: it could be local to the function) */
6861 /* accept other parameters */
6872 /* parse a function defined by symbol 'sym' and generate its code in
6873 'cur_text_section' */
6874 static void gen_function(Sym
*sym
)
6876 int saved_nocode_wanted
= nocode_wanted
;
6879 ind
= cur_text_section
->data_offset
;
6880 /* NOTE: we patch the symbol size later */
6881 put_extern_sym(sym
, cur_text_section
, ind
, 0);
6882 funcname
= get_tok_str(sym
->v
, NULL
);
6884 /* Initialize VLA state */
6886 vla_sp_root_loc
= -1;
6887 /* put debug symbol */
6888 if (tcc_state
->do_debug
)
6889 put_func_debug(sym
);
6891 /* push a dummy symbol to enable local sym storage */
6892 sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
6893 local_scope
= 1; /* for function parameters */
6894 gfunc_prolog(&sym
->type
);
6898 block(NULL
, NULL
, 0);
6901 cur_text_section
->data_offset
= ind
;
6902 label_pop(&global_label_stack
, NULL
);
6903 /* reset local stack */
6905 sym_pop(&local_stack
, NULL
, 0);
6906 /* end of function */
6907 /* patch symbol size */
6908 ((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
].st_size
=
6910 /* patch symbol weakness (this definition overrules any prototype) */
6911 if (sym
->type
.t
& VT_WEAK
)
6913 apply_visibility(sym
, &sym
->type
);
6914 if (tcc_state
->do_debug
) {
6915 put_stabn(N_FUN
, 0, 0, ind
- func_ind
);
6917 /* It's better to crash than to generate wrong code */
6918 cur_text_section
= NULL
;
6919 funcname
= ""; /* for safety */
6920 func_vt
.t
= VT_VOID
; /* for safety */
6921 func_var
= 0; /* for safety */
6922 ind
= 0; /* for safety */
6923 nocode_wanted
= saved_nocode_wanted
;
6927 static void gen_inline_functions(TCCState
*s
)
6930 int inline_generated
, i
, ln
;
6931 struct InlineFunc
*fn
;
6933 ln
= file
->line_num
;
6934 /* iterate while inline function are referenced */
6936 inline_generated
= 0;
6937 for (i
= 0; i
< s
->nb_inline_fns
; ++i
) {
6938 fn
= s
->inline_fns
[i
];
6940 if (sym
&& sym
->c
) {
6941 /* the function was used: generate its code and
6942 convert it to a normal function */
6945 pstrcpy(file
->filename
, sizeof file
->filename
, fn
->filename
);
6946 sym
->r
= VT_SYM
| VT_CONST
;
6947 sym
->type
.t
&= ~VT_INLINE
;
6949 begin_macro(fn
->func_str
, 1);
6951 cur_text_section
= text_section
;
6955 inline_generated
= 1;
6958 if (!inline_generated
)
6961 file
->line_num
= ln
;
6964 ST_FUNC
void free_inline_functions(TCCState
*s
)
6967 /* free tokens of unused inline functions */
6968 for (i
= 0; i
< s
->nb_inline_fns
; ++i
) {
6969 struct InlineFunc
*fn
= s
->inline_fns
[i
];
6971 tok_str_free(fn
->func_str
);
6973 dynarray_reset(&s
->inline_fns
, &s
->nb_inline_fns
);
6976 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
6977 static int decl0(int l
, int is_for_loop_init
)
6985 if (!parse_btype(&btype
, &ad
)) {
6986 if (is_for_loop_init
)
6988 /* skip redundant ';' */
6989 /* XXX: find more elegant solution */
6994 if (l
== VT_CONST
&&
6995 (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
6996 /* global asm block */
7000 /* special test for old K&R protos without explicit int
7001 type. Only accepted when defining global data */
7002 if (l
== VT_LOCAL
|| tok
< TOK_UIDENT
)
7006 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
7007 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
7009 if ((btype
.t
& VT_BTYPE
) == VT_STRUCT
) {
7010 int v
= btype
.ref
->v
;
7011 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) >= SYM_FIRST_ANOM
)
7012 tcc_warning("unnamed struct/union that defines no instances");
7017 while (1) { /* iterate thru each declaration */
7019 /* If the base type itself was an array type of unspecified
7020 size (like in 'typedef int arr[]; arr x = {1};') then
7021 we will overwrite the unknown size by the real one for
7022 this decl. We need to unshare the ref symbol holding
7024 if ((type
.t
& VT_ARRAY
) && type
.ref
->c
< 0) {
7025 type
.ref
= sym_push(SYM_FIELD
, &type
.ref
->type
, 0, type
.ref
->c
);
7027 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
7031 type_to_str(buf
, sizeof(buf
), t
, get_tok_str(v
, NULL
));
7032 printf("type = '%s'\n", buf
);
7035 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
7036 if ((type
.t
& VT_STATIC
) && (l
== VT_LOCAL
)) {
7037 tcc_error("function without file scope cannot be static");
7039 /* if old style function prototype, we accept a
7042 if (sym
->c
== FUNC_OLD
)
7043 func_decl_list(sym
);
7046 if (gnu_ext
&& (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
7047 ad
.asm_label
= asm_label_instr();
7048 /* parse one last attribute list, after asm label */
7049 parse_attribute(&ad
);
7056 #ifdef TCC_TARGET_PE
7057 if (ad
.a
.func_import
)
7058 type
.t
|= VT_IMPORT
;
7059 if (ad
.a
.func_export
)
7060 type
.t
|= VT_EXPORT
;
7062 type
.t
|= ad
.a
.visibility
<< VT_VIS_SHIFT
;
7066 tcc_error("cannot use local functions");
7067 if ((type
.t
& VT_BTYPE
) != VT_FUNC
)
7068 expect("function definition");
7070 /* reject abstract declarators in function definition */
7072 while ((sym
= sym
->next
) != NULL
)
7073 if (!(sym
->v
& ~SYM_FIELD
))
7074 expect("identifier");
7076 /* XXX: cannot do better now: convert extern line to static inline */
7077 if ((type
.t
& (VT_EXTERN
| VT_INLINE
)) == (VT_EXTERN
| VT_INLINE
))
7078 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
7083 if ((sym
->type
.t
& VT_BTYPE
) != VT_FUNC
)
7086 ref
= sym
->type
.ref
;
7087 if (0 == ref
->a
.func_proto
)
7088 tcc_error("redefinition of '%s'", get_tok_str(v
, NULL
));
7090 /* use func_call from prototype if not defined */
7091 if (ref
->a
.func_call
!= FUNC_CDECL
7092 && type
.ref
->a
.func_call
== FUNC_CDECL
)
7093 type
.ref
->a
.func_call
= ref
->a
.func_call
;
7095 /* use export from prototype */
7096 if (ref
->a
.func_export
)
7097 type
.ref
->a
.func_export
= 1;
7099 /* use static from prototype */
7100 if (sym
->type
.t
& VT_STATIC
)
7101 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
7103 /* If the definition has no visibility use the
7104 one from prototype. */
7105 if (! (type
.t
& VT_VIS_MASK
))
7106 type
.t
|= sym
->type
.t
& VT_VIS_MASK
;
7108 if (!is_compatible_types(&sym
->type
, &type
)) {
7110 tcc_error("incompatible types for redefinition of '%s'",
7111 get_tok_str(v
, NULL
));
7113 type
.ref
->a
.func_proto
= 0;
7114 /* if symbol is already defined, then put complete type */
7117 /* put function symbol */
7118 sym
= global_identifier_push(v
, type
.t
, 0);
7119 sym
->type
.ref
= type
.ref
;
7122 /* static inline functions are just recorded as a kind
7123 of macro. Their code will be emitted at the end of
7124 the compilation unit only if they are used */
7125 if ((type
.t
& (VT_INLINE
| VT_STATIC
)) ==
7126 (VT_INLINE
| VT_STATIC
)) {
7128 struct InlineFunc
*fn
;
7129 const char *filename
;
7131 filename
= file
? file
->filename
: "";
7132 fn
= tcc_malloc(sizeof *fn
+ strlen(filename
));
7133 strcpy(fn
->filename
, filename
);
7135 fn
->func_str
= tok_str_alloc();
7141 tcc_error("unexpected end of file");
7142 tok_str_add_tok(fn
->func_str
);
7147 } else if (t
== '}') {
7149 if (block_level
== 0)
7153 tok_str_add(fn
->func_str
, -1);
7154 tok_str_add(fn
->func_str
, 0);
7155 dynarray_add((void ***)&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
, fn
);
7158 /* compute text section */
7159 cur_text_section
= ad
.section
;
7160 if (!cur_text_section
)
7161 cur_text_section
= text_section
;
7162 sym
->r
= VT_SYM
| VT_CONST
;
7167 if (btype
.t
& VT_TYPEDEF
) {
7168 /* save typedefed type */
7169 /* XXX: test storage specifiers ? */
7171 if (sym
&& sym
->scope
== local_scope
) {
7172 if (!is_compatible_types(&sym
->type
, &type
)
7173 || !(sym
->type
.t
& VT_TYPEDEF
))
7174 tcc_error("incompatible redefinition of '%s'",
7175 get_tok_str(v
, NULL
));
7178 sym
= sym_push(v
, &type
, 0, 0);
7181 sym
->type
.t
|= VT_TYPEDEF
;
7184 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
7185 /* external function definition */
7186 /* specific case for func_call attribute */
7187 ad
.a
.func_proto
= 1;
7189 } else if (!(type
.t
& VT_ARRAY
)) {
7190 /* not lvalue if array */
7191 r
|= lvalue_type(type
.t
);
7193 has_init
= (tok
== '=');
7194 if (has_init
&& (type
.t
& VT_VLA
))
7195 tcc_error("variable length array cannot be initialized");
7196 if ((btype
.t
& VT_EXTERN
) || ((type
.t
& VT_BTYPE
) == VT_FUNC
) ||
7197 ((type
.t
& VT_ARRAY
) && (type
.t
& VT_STATIC
) &&
7198 !has_init
&& l
== VT_CONST
&& type
.ref
->c
< 0)) {
7199 /* external variable or function */
7200 /* NOTE: as GCC, uninitialized global static
7201 arrays of null size are considered as
7203 sym
= external_sym(v
, &type
, r
);
7204 sym
->asm_label
= ad
.asm_label
;
7206 if (ad
.alias_target
) {
7211 alias_target
= sym_find(ad
.alias_target
);
7212 if (!alias_target
|| !alias_target
->c
)
7213 tcc_error("unsupported forward __alias__ attribute");
7214 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[alias_target
->c
];
7215 tsec
.sh_num
= esym
->st_shndx
;
7216 put_extern_sym2(sym
, &tsec
, esym
->st_value
, esym
->st_size
, 0);
7219 type
.t
|= (btype
.t
& VT_STATIC
); /* Retain "static". */
7220 if (type
.t
& VT_STATIC
)
7226 decl_initializer_alloc(&type
, &ad
, r
, has_init
, v
, l
);
7230 if (is_for_loop_init
)
7243 ST_FUNC
void decl(int l
)
7248 /* ------------------------------------------------------------------------- */