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 /* If I is >= 1 and a power of two, returns log2(i)+1.
3066 If I is 0 returns 0. */
3067 static int exact_log2p1(int i
)
3072 for (ret
= 1; i
>= 1 << 8; ret
+= 8)
3083 /* Parse GNUC __attribute__ extension. Currently, the following
3084 extensions are recognized:
3085 - aligned(n) : set data/function alignment.
3086 - packed : force data alignment to 1
3087 - section(x) : generate data/code in this section.
3088 - unused : currently ignored, but may be used someday.
3089 - regparm(n) : pass function parameters in registers (i386 only)
3091 static void parse_attribute(AttributeDef
*ad
)
3096 while (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
) {
3100 while (tok
!= ')') {
3101 if (tok
< TOK_IDENT
)
3102 expect("attribute name");
3109 parse_mult_str(&astr
, "section name");
3110 ad
->section
= find_section(tcc_state
, (char *)astr
.data
);
3117 parse_mult_str(&astr
, "alias(\"target\")");
3118 ad
->alias_target
= /* save string as token, for later */
3119 tok_alloc((char*)astr
.data
, astr
.size
-1)->tok
;
3123 case TOK_VISIBILITY1
:
3124 case TOK_VISIBILITY2
:
3126 parse_mult_str(&astr
,
3127 "visibility(\"default|hidden|internal|protected\")");
3128 if (!strcmp (astr
.data
, "default"))
3129 ad
->a
.visibility
= STV_DEFAULT
;
3130 else if (!strcmp (astr
.data
, "hidden"))
3131 ad
->a
.visibility
= STV_HIDDEN
;
3132 else if (!strcmp (astr
.data
, "internal"))
3133 ad
->a
.visibility
= STV_INTERNAL
;
3134 else if (!strcmp (astr
.data
, "protected"))
3135 ad
->a
.visibility
= STV_PROTECTED
;
3137 expect("visibility(\"default|hidden|internal|protected\")");
3146 if (n
<= 0 || (n
& (n
- 1)) != 0)
3147 tcc_error("alignment must be a positive power of two");
3152 ad
->a
.aligned
= exact_log2p1(n
);
3153 if (n
!= 1 << (ad
->a
.aligned
- 1))
3154 tcc_error("alignment of %d is larger than implemented", n
);
3166 /* currently, no need to handle it because tcc does not
3167 track unused objects */
3171 /* currently, no need to handle it because tcc does not
3172 track unused objects */
3177 ad
->a
.func_call
= FUNC_CDECL
;
3182 ad
->a
.func_call
= FUNC_STDCALL
;
3184 #ifdef TCC_TARGET_I386
3194 ad
->a
.func_call
= FUNC_FASTCALL1
+ n
- 1;
3200 ad
->a
.func_call
= FUNC_FASTCALLW
;
3207 ad
->a
.mode
= VT_LLONG
+ 1;
3210 ad
->a
.mode
= VT_BYTE
+ 1;
3213 ad
->a
.mode
= VT_SHORT
+ 1;
3217 ad
->a
.mode
= VT_INT
+ 1;
3220 tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok
, NULL
));
3227 ad
->a
.func_export
= 1;
3230 ad
->a
.func_import
= 1;
3233 if (tcc_state
->warn_unsupported
)
3234 tcc_warning("'%s' attribute ignored", get_tok_str(t
, NULL
));
3235 /* skip parameters */
3237 int parenthesis
= 0;
3241 else if (tok
== ')')
3244 } while (parenthesis
&& tok
!= -1);
3257 static Sym
* find_field (CType
*type
, int v
)
3261 while ((s
= s
->next
) != NULL
) {
3262 if ((s
->v
& SYM_FIELD
) &&
3263 (s
->type
.t
& VT_BTYPE
) == VT_STRUCT
&&
3264 (s
->v
& ~SYM_FIELD
) >= SYM_FIRST_ANOM
) {
3265 Sym
*ret
= find_field (&s
->type
, v
);
3275 static void struct_add_offset (Sym
*s
, int offset
)
3277 while ((s
= s
->next
) != NULL
) {
3278 if ((s
->v
& SYM_FIELD
) &&
3279 (s
->type
.t
& VT_BTYPE
) == VT_STRUCT
&&
3280 (s
->v
& ~SYM_FIELD
) >= SYM_FIRST_ANOM
) {
3281 struct_add_offset(s
->type
.ref
, offset
);
3287 static void struct_layout(CType
*type
, AttributeDef
*ad
)
3289 int align
, maxalign
, offset
, c
, bit_pos
, bt
, prevbt
, prev_bit_size
;
3290 int pcc
= !tcc_state
->ms_bitfields
;
3293 maxalign
= 1 << (ad
->a
.aligned
- 1);
3299 prevbt
= VT_STRUCT
; /* make it never match */
3301 for (f
= type
->ref
->next
; f
; f
= f
->next
) {
3302 int typealign
, bit_size
;
3303 int size
= type_size(&f
->type
, &typealign
);
3304 if (f
->type
.t
& VT_BITFIELD
)
3305 bit_size
= (f
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
3308 if (bit_size
== 0 && pcc
) {
3309 /* Zero-width bit-fields in PCC mode aren't affected
3310 by any packing (attribute or pragma). */
3312 } else if (f
->r
> 1) {
3314 } else if (ad
->a
.packed
|| f
->r
== 1) {
3316 /* Packed fields or packed records don't let the base type
3317 influence the records type alignment. */
3322 if (type
->ref
->type
.t
!= TOK_STRUCT
) {
3323 if (pcc
&& bit_size
>= 0)
3324 size
= (bit_size
+ 7) >> 3;
3325 /* Bit position is already zero from our caller. */
3329 } else if (bit_size
< 0) {
3330 int addbytes
= pcc
? (bit_pos
+ 7) >> 3 : 0;
3333 c
= (c
+ addbytes
+ align
- 1) & -align
;
3339 /* A bit-field. Layout is more complicated. There are two
3340 options TCC implements: PCC compatible and MS compatible
3341 (PCC compatible is what GCC uses for almost all targets).
3342 In PCC layout the overall size of the struct (in c) is
3343 _excluding_ the current run of bit-fields (that is,
3344 there's at least additional bit_pos bits after c). In
3345 MS layout c does include the current run of bit-fields.
3347 This matters for calculating the natural alignment buckets
3350 /* 'align' will be used to influence records alignment,
3351 so it's the max of specified and type alignment, except
3352 in certain cases that depend on the mode. */
3353 if (align
< typealign
)
3356 /* In PCC layout a non-packed bit-field is placed adjacent
3357 to the preceding bit-fields, except if it would overflow
3358 its container (depending on base type) or it's a zero-width
3359 bit-field. Packed non-zero-width bit-fields always are
3361 int ofs
= (c
* 8 + bit_pos
) % (typealign
* 8);
3362 int ofs2
= ofs
+ bit_size
+ (typealign
* 8) - 1;
3363 if (bit_size
== 0 ||
3365 (ofs2
/ (typealign
* 8)) > (size
/typealign
))) {
3366 c
= (c
+ ((bit_pos
+ 7) >> 3) + typealign
- 1) & -typealign
;
3370 /* In PCC layout named bit-fields influence the alignment
3371 of the containing struct using the base types alignment,
3372 except for packed fields (which here have correct
3373 align/typealign). */
3374 if ((f
->v
& SYM_FIRST_ANOM
))
3377 bt
= f
->type
.t
& VT_BTYPE
;
3378 if ((bit_pos
+ bit_size
> size
* 8) ||
3379 (bit_size
> 0) == (bt
!= prevbt
)) {
3380 c
= (c
+ typealign
- 1) & -typealign
;
3383 /* In MS bitfield mode a bit-field run always uses
3384 at least as many bits as the underlying type.
3385 To start a new run it's also required that this
3386 or the last bit-field had non-zero width. */
3387 if (bit_size
|| prev_bit_size
)
3390 /* In MS layout the records alignment is normally
3391 influenced by the field, except for a zero-width
3392 field at the start of a run (but by further zero-width
3393 fields it is again). */
3394 if (bit_size
== 0 && prevbt
!= bt
)
3397 prev_bit_size
= bit_size
;
3399 f
->type
.t
= (f
->type
.t
& ~(0x3f << VT_STRUCT_SHIFT
))
3400 | (bit_pos
<< VT_STRUCT_SHIFT
);
3401 bit_pos
+= bit_size
;
3402 if (pcc
&& bit_pos
>= size
* 8) {
3404 bit_pos
-= size
* 8;
3407 if (align
> maxalign
)
3410 printf("set field %s offset=%d c=%d",
3411 get_tok_str(f
->v
& ~SYM_FIELD
, NULL
), offset
, c
);
3412 if (f
->type
.t
& VT_BITFIELD
) {
3413 printf(" pos=%d size=%d",
3414 (f
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f,
3415 (f
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f);
3420 if (f
->v
& SYM_FIRST_ANOM
&& (f
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
3422 /* An anonymous struct/union. Adjust member offsets
3423 to reflect the real offset of our containing struct.
3424 Also set the offset of this anon member inside
3425 the outer struct to be zero. Via this it
3426 works when accessing the field offset directly
3427 (from base object), as well as when recursing
3428 members in initializer handling. */
3429 int v2
= f
->type
.ref
->v
;
3430 if (!(v2
& SYM_FIELD
) &&
3431 (v2
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
3433 /* This happens only with MS extensions. The
3434 anon member has a named struct type, so it
3435 potentially is shared with other references.
3436 We need to unshare members so we can modify
3439 f
->type
.ref
= sym_push(anon_sym
++ | SYM_FIELD
,
3440 &f
->type
.ref
->type
, 0,
3442 pps
= &f
->type
.ref
->next
;
3443 while ((ass
= ass
->next
) != NULL
) {
3444 *pps
= sym_push(ass
->v
, &ass
->type
, 0, ass
->c
);
3445 pps
= &((*pps
)->next
);
3449 struct_add_offset(f
->type
.ref
, offset
);
3457 /* store size and alignment */
3458 type
->ref
->c
= (c
+ (pcc
? (bit_pos
+ 7) >> 3 : 0)
3459 + maxalign
- 1) & -maxalign
;
3460 type
->ref
->r
= maxalign
;
3463 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
3464 static void struct_decl(CType
*type
, AttributeDef
*ad
, int u
)
3466 int a
, v
, size
, align
, flexible
, alignoverride
;
3468 int bit_size
, bsize
, bt
;
3473 a
= tok
; /* save decl type */
3475 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3476 parse_attribute(ad
);
3480 /* struct already defined ? return it */
3482 expect("struct/union/enum name");
3484 if (s
&& (s
->scope
== local_scope
|| (tok
!= '{' && tok
!= ';'))) {
3486 tcc_error("redefinition of '%s'", get_tok_str(v
, NULL
));
3492 /* Record the original enum/struct/union token. */
3495 /* we put an undefined size for struct/union */
3496 s
= sym_push(v
| SYM_STRUCT
, &type1
, 0, -1);
3497 s
->r
= 0; /* default alignment is zero as gcc */
3498 /* put struct/union/enum name in type */
3506 tcc_error("struct/union/enum already defined");
3507 /* cannot be empty */
3509 /* non empty enums are not allowed */
3510 if (a
== TOK_ENUM
) {
3514 CType
*t
= &int_type
;
3517 expect("identifier");
3519 if (ss
&& !local_stack
)
3520 tcc_error("redefinition of enumerator '%s'",
3521 get_tok_str(v
, NULL
));
3525 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
3528 /* We really want to support long long enums
3529 on i386 as well, but the Sym structure only
3530 holds a 'long' for associated constants,
3531 and enlarging it would bump its size (no
3532 available padding). So punt for now. */
3538 if (c
!= (int)c
&& (unsigned long)c
!= (unsigned int)c
)
3539 seen_wide
= 1, t
= &size_type
;
3540 /* enum symbols have static storage */
3541 ss
= sym_push(v
, t
, VT_CONST
, c
);
3542 ss
->type
.t
|= VT_STATIC
;
3547 /* NOTE: we accept a trailing comma */
3552 s
->a
.unsigned_enum
= 1;
3553 s
->c
= type_size(seen_wide
? &size_type
: &int_type
, &align
);
3558 while (tok
!= '}') {
3559 if (!parse_btype(&btype
, &ad1
)) {
3565 tcc_error("flexible array member '%s' not at the end of struct",
3566 get_tok_str(v
, NULL
));
3571 type_decl(&type1
, &ad1
, &v
, TYPE_DIRECT
| TYPE_ABSTRACT
);
3573 if ((type1
.t
& VT_BTYPE
) != VT_STRUCT
)
3574 expect("identifier");
3576 int v
= btype
.ref
->v
;
3577 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
3578 if (tcc_state
->ms_extensions
== 0)
3579 expect("identifier");
3583 if (type_size(&type1
, &align
) < 0) {
3584 if ((a
== TOK_STRUCT
) && (type1
.t
& VT_ARRAY
) && c
)
3587 tcc_error("field '%s' has incomplete type",
3588 get_tok_str(v
, NULL
));
3590 if ((type1
.t
& VT_BTYPE
) == VT_FUNC
||
3591 (type1
.t
& (VT_TYPEDEF
| VT_STATIC
| VT_EXTERN
| VT_INLINE
)))
3592 tcc_error("invalid type for '%s'",
3593 get_tok_str(v
, NULL
));
3597 bit_size
= expr_const();
3598 /* XXX: handle v = 0 case for messages */
3600 tcc_error("negative width in bit-field '%s'",
3601 get_tok_str(v
, NULL
));
3602 if (v
&& bit_size
== 0)
3603 tcc_error("zero width for bit-field '%s'",
3604 get_tok_str(v
, NULL
));
3605 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3606 parse_attribute(&ad1
);
3608 size
= type_size(&type1
, &align
);
3609 /* Only remember non-default alignment. */
3611 if (ad1
.a
.aligned
) {
3612 int speca
= 1 << (ad1
.a
.aligned
- 1);
3614 alignoverride
= speca
;
3615 } else if (ad1
.a
.packed
|| ad
->a
.packed
) {
3617 } else if (*tcc_state
->pack_stack_ptr
) {
3618 if (align
> *tcc_state
->pack_stack_ptr
)
3619 alignoverride
= *tcc_state
->pack_stack_ptr
;
3621 if (bit_size
>= 0) {
3622 bt
= type1
.t
& VT_BTYPE
;
3629 tcc_error("bitfields must have scalar type");
3631 if (bit_size
> bsize
) {
3632 tcc_error("width of '%s' exceeds its type",
3633 get_tok_str(v
, NULL
));
3634 } else if (bit_size
== bsize
) {
3635 /* no need for bit fields */
3638 type1
.t
|= VT_BITFIELD
|
3639 (0 << VT_STRUCT_SHIFT
) |
3640 (bit_size
<< (VT_STRUCT_SHIFT
+ 6));
3643 if (v
!= 0 || (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
3644 /* Remember we've seen a real field to check
3645 for placement of flexible array member. */
3648 /* If member is a struct or bit-field, enforce
3649 placing into the struct (as anonymous). */
3651 ((type1
.t
& VT_BTYPE
) == VT_STRUCT
||
3656 ss
= sym_push(v
| SYM_FIELD
, &type1
, alignoverride
, 0);
3660 if (tok
== ';' || tok
== TOK_EOF
)
3667 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3668 parse_attribute(ad
);
3669 struct_layout(type
, ad
);
3674 /* return 1 if basic type is a type size (short, long, long long) */
3675 ST_FUNC
int is_btype_size(int bt
)
3677 return bt
== VT_SHORT
|| bt
== VT_LONG
|| bt
== VT_LLONG
;
3680 /* Add type qualifiers to a type. If the type is an array then the qualifiers
3681 are added to the element type, copied because it could be a typedef. */
3682 static void parse_btype_qualify(CType
*type
, int qualifiers
)
3684 while (type
->t
& VT_ARRAY
) {
3685 type
->ref
= sym_push(SYM_FIELD
, &type
->ref
->type
, 0, type
->ref
->c
);
3686 type
= &type
->ref
->type
;
3688 type
->t
|= qualifiers
;
3691 /* return 0 if no type declaration. otherwise, return the basic type
3694 static int parse_btype(CType
*type
, AttributeDef
*ad
)
3696 int t
, u
, bt_size
, complete
, type_found
, typespec_found
;
3700 memset(ad
, 0, sizeof(AttributeDef
));
3708 /* currently, we really ignore extension */
3719 tcc_error("too many basic types");
3721 bt_size
= is_btype_size (u
& VT_BTYPE
);
3722 if (u
== VT_INT
|| (!bt_size
&& !(t
& VT_TYPEDEF
)))
3737 if ((t
& VT_BTYPE
) == VT_DOUBLE
) {
3738 #ifndef TCC_TARGET_PE
3739 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3741 } else if ((t
& VT_BTYPE
) == VT_LONG
) {
3742 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3748 #ifdef TCC_TARGET_ARM64
3750 /* GCC's __uint128_t appears in some Linux header files. Make it a
3751 synonym for long double to get the size and alignment right. */
3763 if ((t
& VT_BTYPE
) == VT_LONG
) {
3764 #ifdef TCC_TARGET_PE
3765 t
= (t
& ~VT_BTYPE
) | VT_DOUBLE
;
3767 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3775 struct_decl(&type1
, ad
, VT_ENUM
);
3778 type
->ref
= type1
.ref
;
3782 struct_decl(&type1
, ad
, VT_STRUCT
);
3785 /* type modifiers */
3790 parse_btype_qualify(type
, VT_CONSTANT
);
3798 parse_btype_qualify(type
, VT_VOLATILE
);
3805 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == (VT_DEFSIGN
|VT_UNSIGNED
))
3806 tcc_error("signed and unsigned modifier");
3819 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == VT_DEFSIGN
)
3820 tcc_error("signed and unsigned modifier");
3821 t
|= VT_DEFSIGN
| VT_UNSIGNED
;
3846 /* GNUC attribute */
3847 case TOK_ATTRIBUTE1
:
3848 case TOK_ATTRIBUTE2
:
3849 parse_attribute(ad
);
3852 t
= (t
& ~VT_BTYPE
) | u
;
3860 parse_expr_type(&type1
);
3861 /* remove all storage modifiers except typedef */
3862 type1
.t
&= ~(VT_STORAGE
&~VT_TYPEDEF
);
3868 if (!s
|| !(s
->type
.t
& VT_TYPEDEF
))
3871 type
->t
= ((s
->type
.t
& ~VT_TYPEDEF
) |
3872 (t
& ~(VT_CONSTANT
| VT_VOLATILE
)));
3873 type
->ref
= s
->type
.ref
;
3874 if (t
& (VT_CONSTANT
| VT_VOLATILE
))
3875 parse_btype_qualify(type
, t
& (VT_CONSTANT
| VT_VOLATILE
));
3879 /* get attributes from typedef */
3880 if (0 == ad
->a
.aligned
)
3881 ad
->a
.aligned
= s
->a
.aligned
;
3882 if (0 == ad
->a
.func_call
)
3883 ad
->a
.func_call
= s
->a
.func_call
;
3884 ad
->a
.packed
|= s
->a
.packed
;
3893 if (tcc_state
->char_is_unsigned
) {
3894 if ((t
& (VT_DEFSIGN
|VT_BTYPE
)) == VT_BYTE
)
3898 /* long is never used as type */
3899 if ((t
& VT_BTYPE
) == VT_LONG
)
3900 #if (!defined TCC_TARGET_X86_64 && !defined TCC_TARGET_ARM64) || \
3901 defined TCC_TARGET_PE
3902 t
= (t
& ~VT_BTYPE
) | VT_INT
;
3904 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3910 /* convert a function parameter type (array to pointer and function to
3911 function pointer) */
3912 static inline void convert_parameter_type(CType
*pt
)
3914 /* remove const and volatile qualifiers (XXX: const could be used
3915 to indicate a const function parameter */
3916 pt
->t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3917 /* array must be transformed to pointer according to ANSI C */
3919 if ((pt
->t
& VT_BTYPE
) == VT_FUNC
) {
3924 ST_FUNC
void parse_asm_str(CString
*astr
)
3927 parse_mult_str(astr
, "string constant");
3930 /* Parse an asm label and return the token */
3931 static int asm_label_instr(void)
3937 parse_asm_str(&astr
);
3940 printf("asm_alias: \"%s\"\n", (char *)astr
.data
);
3942 v
= tok_alloc(astr
.data
, astr
.size
- 1)->tok
;
3947 static void post_type(CType
*type
, AttributeDef
*ad
, int storage
)
3949 int n
, l
, t1
, arg_size
, align
;
3950 Sym
**plast
, *s
, *first
;
3955 /* function declaration */
3963 /* read param name and compute offset */
3964 if (l
!= FUNC_OLD
) {
3965 if (!parse_btype(&pt
, &ad1
)) {
3967 tcc_error("invalid type");
3974 if ((pt
.t
& VT_BTYPE
) == VT_VOID
&& tok
== ')')
3976 type_decl(&pt
, &ad1
, &n
, TYPE_DIRECT
| TYPE_ABSTRACT
);
3977 if ((pt
.t
& VT_BTYPE
) == VT_VOID
)
3978 tcc_error("parameter declared as void");
3979 arg_size
+= (type_size(&pt
, &align
) + PTR_SIZE
- 1) / PTR_SIZE
;
3984 expect("identifier");
3988 convert_parameter_type(&pt
);
3989 s
= sym_push(n
| SYM_FIELD
, &pt
, 0, 0);
3995 if (l
== FUNC_NEW
&& tok
== TOK_DOTS
) {
4002 /* if no parameters, then old type prototype */
4006 /* NOTE: const is ignored in returned type as it has a special
4007 meaning in gcc / C++ */
4008 type
->t
&= ~VT_CONSTANT
;
4009 /* some ancient pre-K&R C allows a function to return an array
4010 and the array brackets to be put after the arguments, such
4011 that "int c()[]" means something like "int[] c()" */
4014 skip(']'); /* only handle simple "[]" */
4017 /* we push a anonymous symbol which will contain the function prototype */
4018 ad
->a
.func_args
= arg_size
;
4019 s
= sym_push(SYM_FIELD
, type
, 0, l
);
4024 } else if (tok
== '[') {
4025 int saved_nocode_wanted
= nocode_wanted
;
4026 /* array definition */
4028 if (tok
== TOK_RESTRICT1
)
4033 if (!local_stack
|| (storage
& VT_STATIC
))
4034 vpushi(expr_const());
4036 /* VLAs (which can only happen with local_stack && !VT_STATIC)
4037 length must always be evaluated, even under nocode_wanted,
4038 so that its size slot is initialized (e.g. under sizeof
4043 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
4046 tcc_error("invalid array size");
4048 if (!is_integer_btype(vtop
->type
.t
& VT_BTYPE
))
4049 tcc_error("size of variable length array should be an integer");
4054 /* parse next post type */
4055 post_type(type
, ad
, storage
);
4056 if (type
->t
== VT_FUNC
)
4057 tcc_error("declaration of an array of functions");
4058 t1
|= type
->t
& VT_VLA
;
4061 loc
-= type_size(&int_type
, &align
);
4065 vla_runtime_type_size(type
, &align
);
4067 vset(&int_type
, VT_LOCAL
|VT_LVAL
, n
);
4073 nocode_wanted
= saved_nocode_wanted
;
4075 /* we push an anonymous symbol which will contain the array
4077 s
= sym_push(SYM_FIELD
, type
, 0, n
);
4078 type
->t
= (t1
? VT_VLA
: VT_ARRAY
) | VT_PTR
;
4083 /* Parse a type declaration (except basic type), and return the type
4084 in 'type'. 'td' is a bitmask indicating which kind of type decl is
4085 expected. 'type' should contain the basic type. 'ad' is the
4086 attribute definition of the basic type. It can be modified by
4089 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
)
4092 CType type1
, *type2
;
4093 int qualifiers
, storage
;
4095 while (tok
== '*') {
4103 qualifiers
|= VT_CONSTANT
;
4108 qualifiers
|= VT_VOLATILE
;
4114 /* XXX: clarify attribute handling */
4115 case TOK_ATTRIBUTE1
:
4116 case TOK_ATTRIBUTE2
:
4117 parse_attribute(ad
);
4121 type
->t
|= qualifiers
;
4124 /* recursive type */
4125 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
4126 type1
.t
= 0; /* XXX: same as int */
4129 /* XXX: this is not correct to modify 'ad' at this point, but
4130 the syntax is not clear */
4131 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
4132 parse_attribute(ad
);
4133 type_decl(&type1
, ad
, v
, td
);
4136 /* type identifier */
4137 if (tok
>= TOK_IDENT
&& (td
& TYPE_DIRECT
)) {
4141 if (!(td
& TYPE_ABSTRACT
))
4142 expect("identifier");
4146 storage
= type
->t
& VT_STORAGE
;
4147 type
->t
&= ~VT_STORAGE
;
4148 post_type(type
, ad
, storage
);
4150 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
4151 parse_attribute(ad
);
4155 /* append type at the end of type1 */
4168 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
4169 ST_FUNC
int lvalue_type(int t
)
4174 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
4176 else if (bt
== VT_SHORT
)
4180 if (t
& VT_UNSIGNED
)
4181 r
|= VT_LVAL_UNSIGNED
;
4185 /* indirection with full error checking and bound check */
4186 ST_FUNC
void indir(void)
4188 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
) {
4189 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FUNC
)
4193 if ((vtop
->r
& VT_LVAL
) && !nocode_wanted
)
4195 vtop
->type
= *pointed_type(&vtop
->type
);
4196 /* Arrays and functions are never lvalues */
4197 if (!(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_VLA
)
4198 && (vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
4199 vtop
->r
|= lvalue_type(vtop
->type
.t
);
4200 /* if bound checking, the referenced pointer must be checked */
4201 #ifdef CONFIG_TCC_BCHECK
4202 if (tcc_state
->do_bounds_check
)
4203 vtop
->r
|= VT_MUSTBOUND
;
4208 /* pass a parameter to a function and do type checking and casting */
4209 static void gfunc_param_typed(Sym
*func
, Sym
*arg
)
4214 func_type
= func
->c
;
4215 if (func_type
== FUNC_OLD
||
4216 (func_type
== FUNC_ELLIPSIS
&& arg
== NULL
)) {
4217 /* default casting : only need to convert float to double */
4218 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
) {
4221 } else if (vtop
->type
.t
& VT_BITFIELD
) {
4222 type
.t
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
4223 type
.ref
= vtop
->type
.ref
;
4226 } else if (arg
== NULL
) {
4227 tcc_error("too many arguments to function");
4230 type
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
4231 gen_assign_cast(&type
);
4235 /* parse an expression of the form '(type)' or '(expr)' and return its
4237 static void parse_expr_type(CType
*type
)
4243 if (parse_btype(type
, &ad
)) {
4244 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
4251 static void parse_type(CType
*type
)
4256 if (!parse_btype(type
, &ad
)) {
4259 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
4262 static void vpush_tokc(int t
)
4267 vsetc(&type
, VT_CONST
, &tokc
);
4270 ST_FUNC
void unary(void)
4272 int n
, t
, align
, size
, r
, sizeof_caller
;
4277 sizeof_caller
= in_sizeof
;
4279 /* XXX: GCC 2.95.3 does not generate a table although it should be
4293 vpush_tokc(VT_INT
| VT_UNSIGNED
);
4297 vpush_tokc(VT_LLONG
);
4301 vpush_tokc(VT_LLONG
| VT_UNSIGNED
);
4305 vpush_tokc(VT_FLOAT
);
4309 vpush_tokc(VT_DOUBLE
);
4313 vpush_tokc(VT_LDOUBLE
);
4316 case TOK___FUNCTION__
:
4318 goto tok_identifier
;
4324 /* special function name identifier */
4325 len
= strlen(funcname
) + 1;
4326 /* generate char[len] type */
4331 vpush_ref(&type
, data_section
, data_section
->data_offset
, len
);
4332 ptr
= section_ptr_add(data_section
, len
);
4333 memcpy(ptr
, funcname
, len
);
4338 #ifdef TCC_TARGET_PE
4339 t
= VT_SHORT
| VT_UNSIGNED
;
4345 /* string parsing */
4348 if (tcc_state
->warn_write_strings
)
4353 memset(&ad
, 0, sizeof(AttributeDef
));
4354 decl_initializer_alloc(&type
, &ad
, VT_CONST
, 2, 0, 0);
4359 if (parse_btype(&type
, &ad
)) {
4360 type_decl(&type
, &ad
, &n
, TYPE_ABSTRACT
);
4362 /* check ISOC99 compound literal */
4364 /* data is allocated locally by default */
4369 /* all except arrays are lvalues */
4370 if (!(type
.t
& VT_ARRAY
))
4371 r
|= lvalue_type(type
.t
);
4372 memset(&ad
, 0, sizeof(AttributeDef
));
4373 decl_initializer_alloc(&type
, &ad
, r
, 1, 0, 0);
4375 if (sizeof_caller
) {
4382 } else if (tok
== '{') {
4384 tcc_error("expected constant");
4385 /* save all registers */
4388 /* statement expression : we do not accept break/continue
4389 inside as GCC does */
4390 block(NULL
, NULL
, 1);
4405 /* functions names must be treated as function pointers,
4406 except for unary '&' and sizeof. Since we consider that
4407 functions are not lvalues, we only have to handle it
4408 there and in function calls. */
4409 /* arrays can also be used although they are not lvalues */
4410 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
&&
4411 !(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_LLOCAL
))
4413 mk_pointer(&vtop
->type
);
4419 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
4421 boolean
.t
= VT_BOOL
;
4423 vtop
->c
.i
= !vtop
->c
.i
;
4424 } else if ((vtop
->r
& VT_VALMASK
) == VT_CMP
)
4428 vseti(VT_JMP
, gvtst(1, 0));
4440 if ((vtop
->type
.t
& VT_BTYPE
) == VT_PTR
)
4441 tcc_error("pointer not accepted for unary plus");
4442 /* In order to force cast, we add zero, except for floating point
4443 where we really need an noop (otherwise -0.0 will be transformed
4445 if (!is_float(vtop
->type
.t
)) {
4456 unary_type(&type
); // Perform a in_sizeof = 0;
4457 size
= type_size(&type
, &align
);
4458 if (t
== TOK_SIZEOF
) {
4459 if (!(type
.t
& VT_VLA
)) {
4461 tcc_error("sizeof applied to an incomplete type");
4464 vla_runtime_type_size(&type
, &align
);
4469 vtop
->type
.t
|= VT_UNSIGNED
;
4472 case TOK_builtin_expect
:
4474 /* __builtin_expect is a no-op for now */
4475 int saved_nocode_wanted
;
4480 saved_nocode_wanted
= nocode_wanted
;
4484 nocode_wanted
= saved_nocode_wanted
;
4488 case TOK_builtin_types_compatible_p
:
4497 type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
4498 type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
4499 vpushi(is_compatible_types(&type1
, &type2
));
4502 case TOK_builtin_choose_expr
:
4504 int saved_nocode_wanted
;
4511 saved_nocode_wanted
= nocode_wanted
;
4517 nocode_wanted
= saved_nocode_wanted
;
4521 saved_nocode_wanted
= nocode_wanted
;
4527 nocode_wanted
= saved_nocode_wanted
;
4532 case TOK_builtin_constant_p
:
4534 int saved_nocode_wanted
, res
;
4537 saved_nocode_wanted
= nocode_wanted
;
4540 res
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
4542 nocode_wanted
= saved_nocode_wanted
;
4547 case TOK_builtin_frame_address
:
4548 case TOK_builtin_return_address
:
4555 if (tok
!= TOK_CINT
) {
4556 tcc_error("%s only takes positive integers",
4557 tok1
== TOK_builtin_return_address
?
4558 "__builtin_return_address" :
4559 "__builtin_frame_address");
4561 level
= (uint32_t)tokc
.i
;
4566 vset(&type
, VT_LOCAL
, 0); /* local frame */
4568 mk_pointer(&vtop
->type
);
4569 indir(); /* -> parent frame */
4571 if (tok1
== TOK_builtin_return_address
) {
4572 // assume return address is just above frame pointer on stack
4575 mk_pointer(&vtop
->type
);
4580 #ifdef TCC_TARGET_X86_64
4581 #ifdef TCC_TARGET_PE
4582 case TOK_builtin_va_start
:
4590 if ((vtop
->r
& VT_VALMASK
) != VT_LOCAL
)
4591 tcc_error("__builtin_va_start expects a local variable");
4592 vtop
->r
&= ~(VT_LVAL
| VT_REF
);
4593 vtop
->type
= char_pointer_type
;
4599 case TOK_builtin_va_arg_types
:
4606 vpushi(classify_x86_64_va_arg(&type
));
4612 #ifdef TCC_TARGET_ARM64
4613 case TOK___va_start
: {
4615 tcc_error("statement in global scope");
4625 vtop
->type
.t
= VT_VOID
;
4628 case TOK___va_arg
: {
4631 tcc_error("statement in global scope");
4643 case TOK___arm64_clear_cache
: {
4652 vtop
->type
.t
= VT_VOID
;
4656 /* pre operations */
4667 t
= vtop
->type
.t
& VT_BTYPE
;
4669 /* In IEEE negate(x) isn't subtract(0,x), but rather
4674 else if (t
== VT_DOUBLE
)
4685 goto tok_identifier
;
4687 /* allow to take the address of a label */
4688 if (tok
< TOK_UIDENT
)
4689 expect("label identifier");
4690 s
= label_find(tok
);
4692 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
4694 if (s
->r
== LABEL_DECLARED
)
4695 s
->r
= LABEL_FORWARD
;
4698 s
->type
.t
= VT_VOID
;
4699 mk_pointer(&s
->type
);
4700 s
->type
.t
|= VT_STATIC
;
4702 vpushsym(&s
->type
, s
);
4706 // special qnan , snan and infinity values
4708 vpush64(VT_DOUBLE
, 0x7ff8000000000000ULL
);
4712 vpush64(VT_DOUBLE
, 0x7ff0000000000001ULL
);
4716 vpush64(VT_DOUBLE
, 0x7ff0000000000000ULL
);
4725 expect("identifier");
4728 const char *name
= get_tok_str(t
, NULL
);
4730 tcc_error("'%s' undeclared", name
);
4731 /* for simple function calls, we tolerate undeclared
4732 external reference to int() function */
4733 if (tcc_state
->warn_implicit_function_declaration
4734 #ifdef TCC_TARGET_PE
4735 /* people must be warned about using undeclared WINAPI functions
4736 (which usually start with uppercase letter) */
4737 || (name
[0] >= 'A' && name
[0] <= 'Z')
4740 tcc_warning("implicit declaration of function '%s'", name
);
4741 s
= external_global_sym(t
, &func_old_type
, 0);
4743 if ((s
->type
.t
& (VT_STATIC
| VT_INLINE
| VT_BTYPE
)) ==
4744 (VT_STATIC
| VT_INLINE
| VT_FUNC
)) {
4745 /* if referencing an inline function, then we generate a
4746 symbol to it if not already done. It will have the
4747 effect to generate code for it at the end of the
4748 compilation unit. Inline function as always
4749 generated in the text section. */
4750 if (!s
->c
&& !nocode_wanted
)
4751 put_extern_sym(s
, text_section
, 0, 0);
4752 r
= VT_SYM
| VT_CONST
;
4755 /* A symbol that has a register is a local register variable,
4756 which starts out as VT_LOCAL value. */
4757 if ((r
& VT_VALMASK
) < VT_CONST
)
4758 r
= (r
& ~VT_VALMASK
) | VT_LOCAL
;
4760 vset(&s
->type
, r
, s
->c
);
4761 /* Point to s as backpointer (even without r&VT_SYM).
4762 Will be used by at least the x86 inline asm parser for
4765 if (vtop
->r
& VT_SYM
) {
4771 /* post operations */
4773 if (tok
== TOK_INC
|| tok
== TOK_DEC
) {
4776 } else if (tok
== '.' || tok
== TOK_ARROW
|| tok
== TOK_CDOUBLE
) {
4779 if (tok
== TOK_ARROW
)
4781 qualifiers
= vtop
->type
.t
& (VT_CONSTANT
| VT_VOLATILE
);
4784 /* expect pointer on structure */
4785 if ((vtop
->type
.t
& VT_BTYPE
) != VT_STRUCT
)
4786 expect("struct or union");
4787 if (tok
== TOK_CDOUBLE
)
4788 expect("field name");
4790 if (tok
== TOK_CINT
|| tok
== TOK_CUINT
)
4791 expect("field name");
4792 s
= find_field(&vtop
->type
, tok
);
4794 tcc_error("field not found: %s", get_tok_str(tok
& ~SYM_FIELD
, &tokc
));
4795 /* add field offset to pointer */
4796 vtop
->type
= char_pointer_type
; /* change type to 'char *' */
4799 /* change type to field type, and set to lvalue */
4800 vtop
->type
= s
->type
;
4801 vtop
->type
.t
|= qualifiers
;
4802 /* an array is never an lvalue */
4803 if (!(vtop
->type
.t
& VT_ARRAY
)) {
4804 vtop
->r
|= lvalue_type(vtop
->type
.t
);
4805 #ifdef CONFIG_TCC_BCHECK
4806 /* if bound checking, the referenced pointer must be checked */
4807 if (tcc_state
->do_bounds_check
&& (vtop
->r
& VT_VALMASK
) != VT_LOCAL
)
4808 vtop
->r
|= VT_MUSTBOUND
;
4812 } else if (tok
== '[') {
4818 } else if (tok
== '(') {
4821 int nb_args
, ret_nregs
, ret_align
, regsize
, variadic
;
4824 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
4825 /* pointer test (no array accepted) */
4826 if ((vtop
->type
.t
& (VT_BTYPE
| VT_ARRAY
)) == VT_PTR
) {
4827 vtop
->type
= *pointed_type(&vtop
->type
);
4828 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
)
4832 expect("function pointer");
4835 vtop
->r
&= ~VT_LVAL
; /* no lvalue */
4837 /* get return type */
4840 sa
= s
->next
; /* first parameter */
4843 /* compute first implicit argument if a structure is returned */
4844 if ((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
4845 variadic
= (s
->c
== FUNC_ELLIPSIS
);
4846 ret_nregs
= gfunc_sret(&s
->type
, variadic
, &ret
.type
,
4847 &ret_align
, ®size
);
4849 /* get some space for the returned structure */
4850 size
= type_size(&s
->type
, &align
);
4851 #ifdef TCC_TARGET_ARM64
4852 /* On arm64, a small struct is return in registers.
4853 It is much easier to write it to memory if we know
4854 that we are allowed to write some extra bytes, so
4855 round the allocated space up to a power of 2: */
4857 while (size
& (size
- 1))
4858 size
= (size
| (size
- 1)) + 1;
4860 loc
= (loc
- size
) & -align
;
4862 ret
.r
= VT_LOCAL
| VT_LVAL
;
4863 /* pass it as 'int' to avoid structure arg passing
4865 vseti(VT_LOCAL
, loc
);
4875 /* return in register */
4876 if (is_float(ret
.type
.t
)) {
4877 ret
.r
= reg_fret(ret
.type
.t
);
4878 #ifdef TCC_TARGET_X86_64
4879 if ((ret
.type
.t
& VT_BTYPE
) == VT_QFLOAT
)
4883 #ifndef TCC_TARGET_ARM64
4884 #ifdef TCC_TARGET_X86_64
4885 if ((ret
.type
.t
& VT_BTYPE
) == VT_QLONG
)
4887 if ((ret
.type
.t
& VT_BTYPE
) == VT_LLONG
)
4898 gfunc_param_typed(s
, sa
);
4908 tcc_error("too few arguments to function");
4910 if (!nocode_wanted
) {
4911 gfunc_call(nb_args
);
4913 vtop
-= (nb_args
+ 1);
4917 for (r
= ret
.r
+ ret_nregs
+ !ret_nregs
; r
-- > ret
.r
;) {
4918 vsetc(&ret
.type
, r
, &ret
.c
);
4919 vtop
->r2
= ret
.r2
; /* Loop only happens when r2 is VT_CONST */
4922 /* handle packed struct return */
4923 if (((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) && ret_nregs
) {
4926 size
= type_size(&s
->type
, &align
);
4927 /* We're writing whole regs often, make sure there's enough
4928 space. Assume register size is power of 2. */
4929 if (regsize
> align
)
4931 loc
= (loc
- size
) & -align
;
4935 vset(&ret
.type
, VT_LOCAL
| VT_LVAL
, addr
+ offset
);
4939 if (--ret_nregs
== 0)
4943 vset(&s
->type
, VT_LOCAL
| VT_LVAL
, addr
);
4951 ST_FUNC
void expr_prod(void)
4956 while (tok
== '*' || tok
== '/' || tok
== '%') {
4964 ST_FUNC
void expr_sum(void)
4969 while (tok
== '+' || tok
== '-') {
4977 static void expr_shift(void)
4982 while (tok
== TOK_SHL
|| tok
== TOK_SAR
) {
4990 static void expr_cmp(void)
4995 while ((tok
>= TOK_ULE
&& tok
<= TOK_GT
) ||
4996 tok
== TOK_ULT
|| tok
== TOK_UGE
) {
5004 static void expr_cmpeq(void)
5009 while (tok
== TOK_EQ
|| tok
== TOK_NE
) {
5017 static void expr_and(void)
5020 while (tok
== '&') {
5027 static void expr_xor(void)
5030 while (tok
== '^') {
5037 static void expr_or(void)
5040 while (tok
== '|') {
5047 /* XXX: fix this mess */
5048 static void expr_land_const(void)
5051 while (tok
== TOK_LAND
) {
5057 static void expr_lor_const(void)
5060 while (tok
== TOK_LOR
) {
5067 static void expr_land(void)
5070 if (tok
== TOK_LAND
) {
5073 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
5080 int saved_nocode_wanted
= nocode_wanted
;
5082 while (tok
== TOK_LAND
) {
5089 nocode_wanted
= saved_nocode_wanted
;
5090 gen_cast(&int_type
);
5098 if (tok
!= TOK_LAND
) {
5111 static void expr_lor(void)
5114 if (tok
== TOK_LOR
) {
5117 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
5124 int saved_nocode_wanted
= nocode_wanted
;
5126 while (tok
== TOK_LOR
) {
5133 nocode_wanted
= saved_nocode_wanted
;
5134 gen_cast(&int_type
);
5142 if (tok
!= TOK_LOR
) {
5155 /* Assuming vtop is a value used in a conditional context
5156 (i.e. compared with zero) return 0 if it's false, 1 if
5157 true and -1 if it can't be statically determined. */
5158 static int condition_3way(void)
5161 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
&&
5162 (!(vtop
->r
& VT_SYM
) ||
5163 !(vtop
->sym
->type
.t
& VT_WEAK
))) {
5165 boolean
.t
= VT_BOOL
;
5174 static void expr_cond(void)
5176 int tt
, u
, r1
, r2
, rc
, t1
, t2
, bt1
, bt2
, islv
;
5179 CType type
, type1
, type2
;
5184 c
= condition_3way();
5186 int saved_nocode_wanted
= nocode_wanted
;
5188 if (tok
!= ':' || !gnu_ext
) {
5196 nocode_wanted
= saved_nocode_wanted
;
5199 if (tok
!= ':' || !gnu_ext
) {
5203 nocode_wanted
= saved_nocode_wanted
;
5210 /* XXX This doesn't handle nocode_wanted correctly at all.
5211 It unconditionally calls gv/gvtst and friends. That's
5212 the case for many of the expr_ routines. Currently
5213 that should generate only useless code, but depending
5214 on other operand handling this might also generate
5215 pointer derefs for lvalue conversions whose result
5216 is useless, but nevertheless can lead to segfault.
5218 Somewhen we need to overhaul the whole nocode_wanted
5220 if (vtop
!= vstack
) {
5221 /* needed to avoid having different registers saved in
5223 if (is_float(vtop
->type
.t
)) {
5225 #ifdef TCC_TARGET_X86_64
5226 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
5236 if (tok
== ':' && gnu_ext
) {
5244 sv
= *vtop
; /* save value to handle it later */
5245 vtop
--; /* no vpop so that FP stack is not flushed */
5253 bt1
= t1
& VT_BTYPE
;
5255 bt2
= t2
& VT_BTYPE
;
5256 /* cast operands to correct type according to ISOC rules */
5257 if (is_float(bt1
) || is_float(bt2
)) {
5258 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
5259 type
.t
= VT_LDOUBLE
;
5260 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
5265 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
5266 /* cast to biggest op */
5268 /* convert to unsigned if it does not fit in a long long */
5269 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
5270 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
5271 type
.t
|= VT_UNSIGNED
;
5272 } else if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
5273 /* If one is a null ptr constant the result type
5275 if (is_null_pointer (vtop
))
5277 else if (is_null_pointer (&sv
))
5279 /* XXX: test pointer compatibility, C99 has more elaborate
5283 } else if (bt1
== VT_FUNC
|| bt2
== VT_FUNC
) {
5284 /* XXX: test function pointer compatibility */
5285 type
= bt1
== VT_FUNC
? type1
: type2
;
5286 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
5287 /* XXX: test structure compatibility */
5288 type
= bt1
== VT_STRUCT
? type1
: type2
;
5289 } else if (bt1
== VT_VOID
|| bt2
== VT_VOID
) {
5290 /* NOTE: as an extension, we accept void on only one side */
5293 /* integer operations */
5295 /* convert to unsigned if it does not fit in an integer */
5296 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
5297 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
5298 type
.t
|= VT_UNSIGNED
;
5300 /* keep structs lvalue by transforming `(expr ? a : b)` to `*(expr ? &a : &b)` so
5301 that `(expr ? a : b).mem` does not error with "lvalue expected" */
5302 islv
= (vtop
->r
& VT_LVAL
) && (sv
.r
& VT_LVAL
) && VT_STRUCT
== (type
.t
& VT_BTYPE
);
5304 /* now we convert second operand */
5307 mk_pointer(&vtop
->type
);
5310 else if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
5313 if (is_float(type
.t
)) {
5315 #ifdef TCC_TARGET_X86_64
5316 if ((type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
5320 } else if ((type
.t
& VT_BTYPE
) == VT_LLONG
) {
5321 /* for long longs, we use fixed registers to avoid having
5322 to handle a complicated move */
5327 /* this is horrible, but we must also convert first
5331 /* put again first value and cast it */
5335 mk_pointer(&vtop
->type
);
5338 else if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
5341 move_reg(r2
, r1
, type
.t
);
5350 static void expr_eq(void)
5356 (tok
>= TOK_A_MOD
&& tok
<= TOK_A_DIV
) ||
5357 tok
== TOK_A_XOR
|| tok
== TOK_A_OR
||
5358 tok
== TOK_A_SHL
|| tok
== TOK_A_SAR
) {
5373 ST_FUNC
void gexpr(void)
5384 /* parse an expression and return its type without any side effect. */
5385 static void expr_type(CType
*type
)
5387 int saved_nocode_wanted
;
5389 saved_nocode_wanted
= nocode_wanted
;
5394 nocode_wanted
= saved_nocode_wanted
;
5397 /* parse a unary expression and return its type without any side
5399 static void unary_type(CType
*type
)
5411 /* parse a constant expression and return value in vtop. */
5412 static void expr_const1(void)
5421 /* parse an integer constant and return its value. */
5422 static inline int64_t expr_const64(void)
5426 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
5427 expect("constant expression");
5433 /* parse an integer constant and return its value.
5434 Complain if it doesn't fit 32bit (signed or unsigned). */
5435 ST_FUNC
int expr_const(void)
5438 int64_t wc
= expr_const64();
5440 if (c
!= wc
&& (unsigned)c
!= wc
)
5441 tcc_error("constant exceeds 32 bit");
5445 /* return the label token if current token is a label, otherwise
5447 static int is_label(void)
5451 /* fast test first */
5452 if (tok
< TOK_UIDENT
)
5454 /* no need to save tokc because tok is an identifier */
5461 unget_tok(last_tok
);
5466 static void label_or_decl(int l
)
5470 /* fast test first */
5471 if (tok
>= TOK_UIDENT
)
5473 /* no need to save tokc because tok is an identifier */
5477 unget_tok(last_tok
);
5480 unget_tok(last_tok
);
5485 static int case_cmp(const void *pa
, const void *pb
)
5487 int64_t a
= (*(struct case_t
**) pa
)->v1
;
5488 int64_t b
= (*(struct case_t
**) pb
)->v1
;
5489 return a
< b
? -1 : a
> b
;
5492 static void gcase(struct case_t
**base
, int len
, int *bsym
)
5496 int ll
= (vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
;
5514 gtst_addr(0, p
->sym
); /* v1 <= x <= v2 */
5516 gcase(base
, len
/2, bsym
);
5517 if (cur_switch
->def_sym
)
5518 gjmp_addr(cur_switch
->def_sym
);
5520 *bsym
= gjmp(*bsym
);
5524 base
+= e
; len
-= e
;
5534 if (p
->v1
== p
->v2
) {
5536 gtst_addr(0, p
->sym
);
5546 gtst_addr(0, p
->sym
);
5552 static void block(int *bsym
, int *csym
, int is_expr
)
5554 int a
, b
, c
, d
, cond
;
5557 /* generate line number info */
5558 if (tcc_state
->do_debug
&&
5559 (last_line_num
!= file
->line_num
|| last_ind
!= ind
)) {
5560 put_stabn(N_SLINE
, 0, file
->line_num
, ind
- func_ind
);
5562 last_line_num
= file
->line_num
;
5566 /* default return value is (void) */
5568 vtop
->type
.t
= VT_VOID
;
5571 if (tok
== TOK_IF
) {
5573 int saved_nocode_wanted
= nocode_wanted
;
5578 cond
= condition_3way();
5582 block(bsym
, csym
, 0);
5584 nocode_wanted
= saved_nocode_wanted
;
5586 if (c
== TOK_ELSE
) {
5592 block(bsym
, csym
, 0);
5593 gsym(d
); /* patch else jmp */
5595 nocode_wanted
= saved_nocode_wanted
;
5598 } else if (tok
== TOK_WHILE
) {
5599 int saved_nocode_wanted
;
5600 nocode_wanted
&= ~2;
5610 saved_nocode_wanted
= nocode_wanted
;
5612 nocode_wanted
= saved_nocode_wanted
;
5618 } else if (tok
== '{') {
5620 int block_vla_sp_loc
= vla_sp_loc
, saved_vlas_in_scope
= vlas_in_scope
;
5623 /* record local declaration stack position */
5625 llabel
= local_label_stack
;
5628 /* handle local labels declarations */
5629 if (tok
== TOK_LABEL
) {
5632 if (tok
< TOK_UIDENT
)
5633 expect("label identifier");
5634 label_push(&local_label_stack
, tok
, LABEL_DECLARED
);
5644 while (tok
!= '}') {
5645 label_or_decl(VT_LOCAL
);
5649 block(bsym
, csym
, is_expr
);
5652 /* pop locally defined labels */
5653 label_pop(&local_label_stack
, llabel
);
5654 /* pop locally defined symbols */
5656 /* In the is_expr case (a statement expression is finished here),
5657 vtop might refer to symbols on the local_stack. Either via the
5658 type or via vtop->sym. We can't pop those nor any that in turn
5659 might be referred to. To make it easier we don't roll back
5660 any symbols in that case; some upper level call to block() will
5661 do that. We do have to remove such symbols from the lookup
5662 tables, though. sym_pop will do that. */
5663 sym_pop(&local_stack
, s
, is_expr
);
5665 /* Pop VLA frames and restore stack pointer if required */
5666 if (vlas_in_scope
> saved_vlas_in_scope
) {
5667 vla_sp_loc
= saved_vlas_in_scope
? block_vla_sp_loc
: vla_sp_root_loc
;
5670 vlas_in_scope
= saved_vlas_in_scope
;
5673 } else if (tok
== TOK_RETURN
) {
5677 gen_assign_cast(&func_vt
);
5678 #ifdef TCC_TARGET_ARM64
5679 // Perhaps it would be better to use this for all backends:
5682 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
5683 CType type
, ret_type
;
5684 int ret_align
, ret_nregs
, regsize
;
5685 ret_nregs
= gfunc_sret(&func_vt
, func_var
, &ret_type
,
5686 &ret_align
, ®size
);
5687 if (0 == ret_nregs
) {
5688 /* if returning structure, must copy it to implicit
5689 first pointer arg location */
5692 vset(&type
, VT_LOCAL
| VT_LVAL
, func_vc
);
5695 /* copy structure value to pointer */
5698 /* returning structure packed into registers */
5699 int r
, size
, addr
, align
;
5700 size
= type_size(&func_vt
,&align
);
5701 if ((vtop
->r
!= (VT_LOCAL
| VT_LVAL
) ||
5702 (vtop
->c
.i
& (ret_align
-1)))
5703 && (align
& (ret_align
-1))) {
5704 loc
= (loc
- size
) & -ret_align
;
5707 vset(&type
, VT_LOCAL
| VT_LVAL
, addr
);
5711 vset(&ret_type
, VT_LOCAL
| VT_LVAL
, addr
);
5713 vtop
->type
= ret_type
;
5714 if (is_float(ret_type
.t
))
5715 r
= rc_fret(ret_type
.t
);
5726 if (--ret_nregs
== 0)
5728 /* We assume that when a structure is returned in multiple
5729 registers, their classes are consecutive values of the
5732 vtop
->c
.i
+= regsize
;
5736 } else if (is_float(func_vt
.t
)) {
5737 gv(rc_fret(func_vt
.t
));
5742 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
5745 /* jump unless last stmt in top-level block */
5746 if (tok
!= '}' || local_scope
!= 1)
5749 } else if (tok
== TOK_BREAK
) {
5752 tcc_error("cannot break");
5753 *bsym
= gjmp(*bsym
);
5757 } else if (tok
== TOK_CONTINUE
) {
5760 tcc_error("cannot continue");
5761 vla_sp_restore_root();
5762 *csym
= gjmp(*csym
);
5765 } else if (tok
== TOK_FOR
) {
5767 int saved_nocode_wanted
;
5768 nocode_wanted
&= ~2;
5774 /* c99 for-loop init decl? */
5775 if (!decl0(VT_LOCAL
, 1)) {
5776 /* no, regular for-loop init expr */
5802 saved_nocode_wanted
= nocode_wanted
;
5804 nocode_wanted
= saved_nocode_wanted
;
5810 sym_pop(&local_stack
, s
, 0);
5813 if (tok
== TOK_DO
) {
5814 int saved_nocode_wanted
;
5815 nocode_wanted
&= ~2;
5821 saved_nocode_wanted
= nocode_wanted
;
5823 nocode_wanted
= saved_nocode_wanted
;
5835 if (tok
== TOK_SWITCH
) {
5836 struct switch_t
*saved
, sw
;
5837 int saved_nocode_wanted
= nocode_wanted
;
5843 switchval
= *vtop
--;
5845 b
= gjmp(0); /* jump to first case */
5846 sw
.p
= NULL
; sw
.n
= 0; sw
.def_sym
= 0;
5850 nocode_wanted
= saved_nocode_wanted
;
5851 a
= gjmp(a
); /* add implicit break */
5854 if (!nocode_wanted
) {
5855 qsort(sw
.p
, sw
.n
, sizeof(void*), case_cmp
);
5856 for (b
= 1; b
< sw
.n
; b
++)
5857 if (sw
.p
[b
- 1]->v2
>= sw
.p
[b
]->v1
)
5858 tcc_error("duplicate case value");
5859 /* Our switch table sorting is signed, so the compared
5860 value needs to be as well when it's 64bit. */
5861 if ((switchval
.type
.t
& VT_BTYPE
) == VT_LLONG
)
5862 switchval
.type
.t
&= ~VT_UNSIGNED
;
5864 gcase(sw
.p
, sw
.n
, &a
);
5867 gjmp_addr(sw
.def_sym
);
5869 dynarray_reset(&sw
.p
, &sw
.n
);
5874 if (tok
== TOK_CASE
) {
5875 struct case_t
*cr
= tcc_malloc(sizeof(struct case_t
));
5878 nocode_wanted
&= ~2;
5880 cr
->v1
= cr
->v2
= expr_const64();
5881 if (gnu_ext
&& tok
== TOK_DOTS
) {
5883 cr
->v2
= expr_const64();
5884 if (cr
->v2
< cr
->v1
)
5885 tcc_warning("empty case range");
5888 dynarray_add((void***) &cur_switch
->p
, &cur_switch
->n
, cr
);
5891 goto block_after_label
;
5893 if (tok
== TOK_DEFAULT
) {
5898 if (cur_switch
->def_sym
)
5899 tcc_error("too many 'default'");
5900 cur_switch
->def_sym
= ind
;
5902 goto block_after_label
;
5904 if (tok
== TOK_GOTO
) {
5906 if (tok
== '*' && gnu_ext
) {
5910 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
)
5916 } else if (tok
>= TOK_UIDENT
) {
5917 s
= label_find(tok
);
5918 /* put forward definition if needed */
5920 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
5922 if (s
->r
== LABEL_DECLARED
)
5923 s
->r
= LABEL_FORWARD
;
5925 vla_sp_restore_root();
5928 else if (s
->r
& LABEL_FORWARD
)
5929 s
->jnext
= gjmp(s
->jnext
);
5931 gjmp_addr(s
->jnext
);
5934 expect("label identifier");
5937 } else if (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
) {
5945 if (s
->r
== LABEL_DEFINED
)
5946 tcc_error("duplicate label '%s'", get_tok_str(s
->v
, NULL
));
5948 s
->r
= LABEL_DEFINED
;
5950 s
= label_push(&global_label_stack
, b
, LABEL_DEFINED
);
5954 /* we accept this, but it is a mistake */
5956 nocode_wanted
&= ~2;
5958 tcc_warning("deprecated use of label at end of compound statement");
5962 block(bsym
, csym
, is_expr
);
5965 /* expression case */
5980 #define EXPR_CONST 1
5983 static void parse_init_elem(int expr_type
)
5985 int saved_global_expr
;
5988 /* compound literals must be allocated globally in this case */
5989 saved_global_expr
= global_expr
;
5992 global_expr
= saved_global_expr
;
5993 /* NOTE: symbols are accepted */
5994 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) != VT_CONST
)
5995 tcc_error("initializer element is not constant");
6003 /* t is the array or struct type. c is the array or struct
6004 address. cur_field is the pointer to the current
6005 value, for arrays the 'c' member contains the current start
6006 index and the 'r' contains the end index (in case of range init).
6007 'size_only' is true if only size info is needed (only used
6009 static void decl_designator(CType
*type
, Section
*sec
, unsigned long c
,
6010 Sym
**cur_field
, int size_only
)
6013 int notfirst
, index
, index_last
, align
, l
, nb_elems
, elem_size
;
6019 if (gnu_ext
&& (l
= is_label()) != 0)
6021 while (tok
== '[' || tok
== '.') {
6023 if (!(type
->t
& VT_ARRAY
))
6024 expect("array type");
6027 index
= expr_const();
6028 if (index
< 0 || (s
->c
>= 0 && index
>= s
->c
))
6029 tcc_error("invalid index");
6030 if (tok
== TOK_DOTS
&& gnu_ext
) {
6032 index_last
= expr_const();
6033 if (index_last
< 0 ||
6034 (s
->c
>= 0 && index_last
>= s
->c
) ||
6036 tcc_error("invalid index");
6042 (*cur_field
)->c
= index
;
6043 (*cur_field
)->r
= index_last
;
6045 type
= pointed_type(type
);
6046 elem_size
= type_size(type
, &align
);
6047 c
+= index
* elem_size
;
6048 /* NOTE: we only support ranges for last designator */
6049 nb_elems
= index_last
- index
+ 1;
6050 if (nb_elems
!= 1) {
6059 if ((type
->t
& VT_BTYPE
) != VT_STRUCT
)
6060 expect("struct/union type");
6061 f
= find_field(type
, l
);
6066 /* XXX: fix this mess by using explicit storage field */
6068 type1
.t
|= (type
->t
& ~VT_TYPE
);
6082 if (type
->t
& VT_ARRAY
) {
6083 index
= (*cur_field
)->c
;
6084 if (type
->ref
->c
>= 0 && index
>= type
->ref
->c
)
6085 tcc_error("index too large");
6086 type
= pointed_type(type
);
6087 c
+= index
* type_size(type
, &align
);
6091 tcc_error("too many field init");
6092 /* XXX: fix this mess by using explicit storage field */
6094 type1
.t
|= (type
->t
& ~VT_TYPE
);
6099 decl_initializer(type
, sec
, c
, 0, size_only
);
6101 /* XXX: make it more general */
6102 if (!size_only
&& nb_elems
> 1) {
6103 unsigned long c_end
;
6108 vset(type
, VT_LOCAL
|VT_LVAL
, c
);
6109 for (i
= 1; i
< nb_elems
; i
++) {
6110 vset(type
, VT_LOCAL
|VT_LVAL
, c
+ elem_size
* i
);
6116 c_end
= c
+ nb_elems
* elem_size
;
6117 if (c_end
> sec
->data_allocated
)
6118 section_realloc(sec
, c_end
);
6119 src
= sec
->data
+ c
;
6121 for(i
= 1; i
< nb_elems
; i
++) {
6123 memcpy(dst
, src
, elem_size
);
6129 /* store a value or an expression directly in global data or in local array */
6130 static void init_putv(CType
*type
, Section
*sec
, unsigned long c
)
6132 int bt
, bit_pos
, bit_size
;
6134 unsigned long long bit_mask
;
6138 dtype
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
6142 /* XXX: not portable */
6143 /* XXX: generate error if incorrect relocation */
6144 gen_assign_cast(&dtype
);
6145 bt
= type
->t
& VT_BTYPE
;
6146 size
= type_size(type
, &align
);
6147 if (c
+ size
> sec
->data_allocated
) {
6148 section_realloc(sec
, c
+ size
);
6150 ptr
= sec
->data
+ c
;
6151 /* XXX: make code faster ? */
6152 if (!(type
->t
& VT_BITFIELD
)) {
6154 bit_size
= PTR_SIZE
* 8;
6157 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
6158 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
6159 bit_mask
= (1LL << bit_size
) - 1;
6161 if ((vtop
->r
& (VT_SYM
|VT_CONST
)) == (VT_SYM
|VT_CONST
) &&
6162 vtop
->sym
->v
>= SYM_FIRST_ANOM
&&
6163 /* XXX This rejects compount literals like
6164 '(void *){ptr}'. The problem is that '&sym' is
6165 represented the same way, which would be ruled out
6166 by the SYM_FIRST_ANOM check above, but also '"string"'
6167 in 'char *p = "string"' is represented the same
6168 with the type being VT_PTR and the symbol being an
6169 anonymous one. That is, there's no difference in vtop
6170 between '(void *){x}' and '&(void *){x}'. Ignore
6171 pointer typed entities here. Hopefully no real code
6172 will every use compound literals with scalar type. */
6173 (vtop
->type
.t
& VT_BTYPE
) != VT_PTR
) {
6174 /* These come from compound literals, memcpy stuff over. */
6178 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[vtop
->sym
->c
];
6179 ssec
= tcc_state
->sections
[esym
->st_shndx
];
6180 memmove (ptr
, ssec
->data
+ esym
->st_value
, size
);
6182 /* We need to copy over all memory contents, and that
6183 includes relocations. Use the fact that relocs are
6184 created it order, so look from the end of relocs
6185 until we hit one before the copied region. */
6186 int num_relocs
= ssec
->reloc
->data_offset
/ sizeof(*rel
);
6187 rel
= (ElfW_Rel
*)(ssec
->reloc
->data
+ ssec
->reloc
->data_offset
);
6188 while (num_relocs
--) {
6190 if (rel
->r_offset
>= esym
->st_value
+ size
)
6192 if (rel
->r_offset
< esym
->st_value
)
6194 /* Note: if the same fields are initialized multiple
6195 times (possible with designators) then we possibly
6196 add multiple relocations for the same offset here.
6197 That would lead to wrong code, the last reloc needs
6198 to win. We clean this up later after the whole
6199 initializer is parsed. */
6200 put_elf_reloca(symtab_section
, sec
,
6201 c
+ rel
->r_offset
- esym
->st_value
,
6202 ELFW(R_TYPE
)(rel
->r_info
),
6203 ELFW(R_SYM
)(rel
->r_info
),
6204 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
6213 if ((vtop
->r
& VT_SYM
) &&
6219 (bt
== VT_LLONG
&& bit_size
!= 64) ||
6223 (bt
== VT_INT
&& bit_size
!= 32)
6226 tcc_error("initializer element is not computable at load time");
6228 /* XXX: when cross-compiling we assume that each type has the
6229 same representation on host and target, which is likely to
6230 be wrong in the case of long double */
6232 vtop
->c
.i
= (vtop
->c
.i
!= 0);
6234 *(char *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
6237 *(short *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
6240 *(double *)ptr
= vtop
->c
.d
;
6243 if (sizeof(long double) == LDOUBLE_SIZE
)
6244 *(long double *)ptr
= vtop
->c
.ld
;
6245 else if (sizeof(double) == LDOUBLE_SIZE
)
6246 *(double *)ptr
= vtop
->c
.ld
;
6248 tcc_error("can't cross compile long double constants");
6252 *(long long *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
6259 addr_t val
= (vtop
->c
.i
& bit_mask
) << bit_pos
;
6260 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
6261 if (vtop
->r
& VT_SYM
)
6262 greloca(sec
, vtop
->sym
, c
, R_DATA_PTR
, val
);
6264 *(addr_t
*)ptr
|= val
;
6266 if (vtop
->r
& VT_SYM
)
6267 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
6268 *(addr_t
*)ptr
|= val
;
6274 int val
= (vtop
->c
.i
& bit_mask
) << bit_pos
;
6275 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
6276 if (vtop
->r
& VT_SYM
)
6277 greloca(sec
, vtop
->sym
, c
, R_DATA_PTR
, val
);
6281 if (vtop
->r
& VT_SYM
)
6282 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
6291 vset(&dtype
, VT_LOCAL
|VT_LVAL
, c
);
6298 /* put zeros for variable based init */
6299 static void init_putz(Section
*sec
, unsigned long c
, int size
)
6302 /* nothing to do because globals are already set to zero */
6304 vpush_global_sym(&func_old_type
, TOK_memset
);
6306 #ifdef TCC_TARGET_ARM
6317 /* 't' contains the type and storage info. 'c' is the offset of the
6318 object in section 'sec'. If 'sec' is NULL, it means stack based
6319 allocation. 'first' is true if array '{' must be read (multi
6320 dimension implicit array init handling). 'size_only' is true if
6321 size only evaluation is wanted (only for arrays). */
6322 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
,
6323 int first
, int size_only
)
6325 int index
, array_length
, n
, no_oblock
, nb
, parlevel
, parlevel1
, i
;
6332 /* If we currently are at an '}' or ',' we have read an initializer
6333 element in one of our callers, and not yet consumed it. */
6334 have_elem
= tok
== '}' || tok
== ',';
6335 if (!have_elem
&& tok
!= '{' &&
6336 /* In case of strings we have special handling for arrays, so
6337 don't consume them as initializer value (which would commit them
6338 to some anonymous symbol). */
6339 tok
!= TOK_LSTR
&& tok
!= TOK_STR
&&
6341 parse_init_elem(!sec
? EXPR_ANY
: EXPR_CONST
);
6346 !(type
->t
& VT_ARRAY
) &&
6347 /* Use i_c_parameter_t, to strip toplevel qualifiers.
6348 The source type might have VT_CONSTANT set, which is
6349 of course assignable to non-const elements. */
6350 is_compatible_parameter_types(type
, &vtop
->type
)) {
6351 init_putv(type
, sec
, c
);
6352 } else if (type
->t
& VT_ARRAY
) {
6356 t1
= pointed_type(type
);
6357 size1
= type_size(t1
, &align1
);
6360 if ((first
&& tok
!= TOK_LSTR
&& tok
!= TOK_STR
) ||
6363 tcc_error("character array initializer must be a literal,"
6364 " optionally enclosed in braces");
6369 /* only parse strings here if correct type (otherwise: handle
6370 them as ((w)char *) expressions */
6371 if ((tok
== TOK_LSTR
&&
6372 #ifdef TCC_TARGET_PE
6373 (t1
->t
& VT_BTYPE
) == VT_SHORT
&& (t1
->t
& VT_UNSIGNED
)
6375 (t1
->t
& VT_BTYPE
) == VT_INT
6377 ) || (tok
== TOK_STR
&& (t1
->t
& VT_BTYPE
) == VT_BYTE
)) {
6378 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
6381 /* compute maximum number of chars wanted */
6383 cstr_len
= tokc
.str
.size
;
6385 cstr_len
= tokc
.str
.size
/ sizeof(nwchar_t
);
6388 if (n
>= 0 && nb
> (n
- array_length
))
6389 nb
= n
- array_length
;
6392 tcc_warning("initializer-string for array is too long");
6393 /* in order to go faster for common case (char
6394 string in global variable, we handle it
6396 if (sec
&& tok
== TOK_STR
&& size1
== 1) {
6397 memcpy(sec
->data
+ c
+ array_length
, tokc
.str
.data
, nb
);
6401 ch
= ((unsigned char *)tokc
.str
.data
)[i
];
6403 ch
= ((nwchar_t
*)tokc
.str
.data
)[i
];
6405 init_putv(t1
, sec
, c
+ (array_length
+ i
) * size1
);
6412 /* only add trailing zero if enough storage (no
6413 warning in this case since it is standard) */
6414 if (n
< 0 || array_length
< n
) {
6417 init_putv(t1
, sec
, c
+ (array_length
* size1
));
6427 while (tok
!= '}' || have_elem
) {
6428 decl_designator(type
, sec
, c
, &f
, size_only
);
6431 /* must put zero in holes (note that doing it that way
6432 ensures that it even works with designators) */
6433 if (!size_only
&& array_length
< index
) {
6434 init_putz(sec
, c
+ array_length
* size1
,
6435 (index
- array_length
) * size1
);
6437 if (type
->t
& VT_ARRAY
) {
6438 index
= indexsym
.c
= ++indexsym
.r
;
6440 index
= index
+ type_size(&f
->type
, &align1
);
6441 if (s
->type
.t
== TOK_UNION
)
6446 if (index
> array_length
)
6447 array_length
= index
;
6449 if (type
->t
& VT_ARRAY
) {
6450 /* special test for multi dimensional arrays (may not
6451 be strictly correct if designators are used at the
6453 if (no_oblock
&& index
>= n
)
6456 if (no_oblock
&& f
== NULL
)
6464 /* put zeros at the end */
6465 if (!size_only
&& array_length
< n
) {
6466 init_putz(sec
, c
+ array_length
* size1
,
6467 (n
- array_length
) * size1
);
6471 /* patch type size if needed, which happens only for array types */
6473 s
->c
= array_length
;
6474 } else if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
6477 if (first
|| tok
== '{') {
6486 } else if (tok
== '{') {
6488 decl_initializer(type
, sec
, c
, first
, size_only
);
6490 } else if (size_only
) {
6491 /* If we supported only ISO C we wouldn't have to accept calling
6492 this on anything than an array size_only==1 (and even then
6493 only on the outermost level, so no recursion would be needed),
6494 because initializing a flex array member isn't supported.
6495 But GNU C supports it, so we need to recurse even into
6496 subfields of structs and arrays when size_only is set. */
6497 /* just skip expression */
6498 parlevel
= parlevel1
= 0;
6499 while ((parlevel
> 0 || parlevel1
> 0 ||
6500 (tok
!= '}' && tok
!= ',')) && tok
!= -1) {
6503 else if (tok
== ')') {
6504 if (parlevel
== 0 && parlevel1
== 0)
6508 else if (tok
== '{')
6510 else if (tok
== '}') {
6511 if (parlevel
== 0 && parlevel1
== 0)
6519 /* This should happen only when we haven't parsed
6520 the init element above for fear of committing a
6521 string constant to memory too early. */
6522 if (tok
!= TOK_STR
&& tok
!= TOK_LSTR
)
6523 expect("string constant");
6524 parse_init_elem(!sec
? EXPR_ANY
: EXPR_CONST
);
6526 init_putv(type
, sec
, c
);
6530 /* parse an initializer for type 't' if 'has_init' is non zero, and
6531 allocate space in local or global data space ('r' is either
6532 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
6533 variable 'v' of scope 'scope' is declared before initializers
6534 are parsed. If 'v' is zero, then a reference to the new object
6535 is put in the value stack. If 'has_init' is 2, a special parsing
6536 is done to handle string constants. */
6537 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
,
6538 int has_init
, int v
, int scope
)
6540 int size
, align
, addr
, data_offset
;
6542 ParseState saved_parse_state
= {0};
6543 TokenString
*init_str
= NULL
;
6545 Sym
*flexible_array
;
6547 flexible_array
= NULL
;
6548 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
6549 Sym
*field
= type
->ref
->next
;
6552 field
= field
->next
;
6553 if (field
->type
.t
& VT_ARRAY
&& field
->type
.ref
->c
< 0)
6554 flexible_array
= field
;
6558 size
= type_size(type
, &align
);
6559 /* If unknown size, we must evaluate it before
6560 evaluating initializers because
6561 initializers can generate global data too
6562 (e.g. string pointers or ISOC99 compound
6563 literals). It also simplifies local
6564 initializers handling */
6565 if (size
< 0 || (flexible_array
&& has_init
)) {
6567 tcc_error("unknown type size");
6568 /* get all init string */
6569 init_str
= tok_str_alloc();
6570 if (has_init
== 2) {
6571 /* only get strings */
6572 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
6573 tok_str_add_tok(init_str
);
6578 while (level
> 0 || (tok
!= ',' && tok
!= ';')) {
6580 tcc_error("unexpected end of file in initializer");
6581 tok_str_add_tok(init_str
);
6584 else if (tok
== '}') {
6594 tok_str_add(init_str
, -1);
6595 tok_str_add(init_str
, 0);
6598 save_parse_state(&saved_parse_state
);
6600 begin_macro(init_str
, 1);
6602 decl_initializer(type
, NULL
, 0, 1, 1);
6603 /* prepare second initializer parsing */
6604 macro_ptr
= init_str
->str
;
6607 /* if still unknown size, error */
6608 size
= type_size(type
, &align
);
6610 tcc_error("unknown type size");
6612 /* If there's a flex member and it was used in the initializer
6614 if (flexible_array
&&
6615 flexible_array
->type
.ref
->c
> 0)
6616 size
+= flexible_array
->type
.ref
->c
6617 * pointed_size(&flexible_array
->type
);
6618 /* take into account specified alignment if bigger */
6619 if (ad
->a
.aligned
) {
6620 int speca
= 1 << (ad
->a
.aligned
- 1);
6623 } else if (ad
->a
.packed
) {
6626 if ((r
& VT_VALMASK
) == VT_LOCAL
) {
6628 #ifdef CONFIG_TCC_BCHECK
6629 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
6633 loc
= (loc
- size
) & -align
;
6635 #ifdef CONFIG_TCC_BCHECK
6636 /* handles bounds */
6637 /* XXX: currently, since we do only one pass, we cannot track
6638 '&' operators, so we add only arrays */
6639 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
6641 /* add padding between regions */
6643 /* then add local bound info */
6644 bounds_ptr
= section_ptr_add(lbounds_section
, 2 * sizeof(addr_t
));
6645 bounds_ptr
[0] = addr
;
6646 bounds_ptr
[1] = size
;
6650 /* local variable */
6651 #ifdef CONFIG_TCC_ASM
6652 if (ad
->asm_label
) {
6653 int reg
= asm_parse_regvar(ad
->asm_label
);
6655 r
= (r
& ~VT_VALMASK
) | reg
;
6658 sym_push(v
, type
, r
, addr
);
6660 /* push local reference */
6661 vset(type
, r
, addr
);
6667 if (v
&& scope
== VT_CONST
) {
6668 /* see if the symbol was already defined */
6671 if (!is_compatible_types(&sym
->type
, type
))
6672 tcc_error("incompatible types for redefinition of '%s'",
6673 get_tok_str(v
, NULL
));
6674 if (sym
->type
.t
& VT_EXTERN
) {
6675 /* if the variable is extern, it was not allocated */
6676 sym
->type
.t
&= ~VT_EXTERN
;
6677 /* set array size if it was omitted in extern
6679 if ((sym
->type
.t
& VT_ARRAY
) &&
6680 sym
->type
.ref
->c
< 0 &&
6682 sym
->type
.ref
->c
= type
->ref
->c
;
6684 /* we accept several definitions of the same
6685 global variable. this is tricky, because we
6686 must play with the SHN_COMMON type of the symbol */
6687 /* XXX: should check if the variable was already
6688 initialized. It is incorrect to initialized it
6690 /* no init data, we won't add more to the symbol */
6697 /* allocate symbol in corresponding section */
6702 else if (tcc_state
->nocommon
)
6706 data_offset
= sec
->data_offset
;
6707 data_offset
= (data_offset
+ align
- 1) & -align
;
6709 /* very important to increment global pointer at this time
6710 because initializers themselves can create new initializers */
6711 data_offset
+= size
;
6712 #ifdef CONFIG_TCC_BCHECK
6713 /* add padding if bound check */
6714 if (tcc_state
->do_bounds_check
)
6717 sec
->data_offset
= data_offset
;
6718 /* allocate section space to put the data */
6719 if (sec
->sh_type
!= SHT_NOBITS
&&
6720 data_offset
> sec
->data_allocated
)
6721 section_realloc(sec
, data_offset
);
6722 /* align section if needed */
6723 if (align
> sec
->sh_addralign
)
6724 sec
->sh_addralign
= align
;
6726 addr
= 0; /* avoid warning */
6730 if (scope
!= VT_CONST
|| !sym
) {
6731 sym
= sym_push(v
, type
, r
| VT_SYM
, 0);
6732 sym
->asm_label
= ad
->asm_label
;
6734 /* update symbol definition */
6736 put_extern_sym(sym
, sec
, addr
, size
);
6739 /* put a common area */
6740 put_extern_sym(sym
, NULL
, align
, size
);
6741 /* XXX: find a nicer way */
6742 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
6743 esym
->st_shndx
= SHN_COMMON
;
6746 /* push global reference */
6747 sym
= get_sym_ref(type
, sec
, addr
, size
);
6748 vpushsym(type
, sym
);
6750 /* patch symbol weakness */
6751 if (type
->t
& VT_WEAK
)
6753 apply_visibility(sym
, type
);
6754 #ifdef CONFIG_TCC_BCHECK
6755 /* handles bounds now because the symbol must be defined
6756 before for the relocation */
6757 if (tcc_state
->do_bounds_check
) {
6760 greloc(bounds_section
, sym
, bounds_section
->data_offset
, R_DATA_PTR
);
6761 /* then add global bound info */
6762 bounds_ptr
= section_ptr_add(bounds_section
, 2 * sizeof(addr_t
));
6763 bounds_ptr
[0] = 0; /* relocated */
6764 bounds_ptr
[1] = size
;
6768 if (type
->t
& VT_VLA
) {
6771 /* save current stack pointer */
6772 if (vlas_in_scope
== 0) {
6773 if (vla_sp_root_loc
== -1)
6774 vla_sp_root_loc
= (loc
-= PTR_SIZE
);
6775 gen_vla_sp_save(vla_sp_root_loc
);
6778 vla_runtime_type_size(type
, &a
);
6779 gen_vla_alloc(type
, a
);
6780 gen_vla_sp_save(addr
);
6783 } else if (has_init
) {
6784 size_t oldreloc_offset
= 0;
6785 if (sec
&& sec
->reloc
)
6786 oldreloc_offset
= sec
->reloc
->data_offset
;
6787 decl_initializer(type
, sec
, addr
, 1, 0);
6788 if (sec
&& sec
->reloc
)
6789 squeeze_multi_relocs(sec
, oldreloc_offset
);
6790 /* patch flexible array member size back to -1, */
6791 /* for possible subsequent similar declarations */
6793 flexible_array
->type
.ref
->c
= -1;
6796 /* restore parse state if needed */
6799 restore_parse_state(&saved_parse_state
);
6803 static void put_func_debug(Sym
*sym
)
6808 /* XXX: we put here a dummy type */
6809 snprintf(buf
, sizeof(buf
), "%s:%c1",
6810 funcname
, sym
->type
.t
& VT_STATIC
? 'f' : 'F');
6811 put_stabs_r(buf
, N_FUN
, 0, file
->line_num
, 0,
6812 cur_text_section
, sym
->c
);
6813 /* //gr gdb wants a line at the function */
6814 put_stabn(N_SLINE
, 0, file
->line_num
, 0);
6819 /* parse an old style function declaration list */
6820 /* XXX: check multiple parameter */
6821 static void func_decl_list(Sym
*func_sym
)
6828 /* parse each declaration */
6829 while (tok
!= '{' && tok
!= ';' && tok
!= ',' && tok
!= TOK_EOF
&&
6830 tok
!= TOK_ASM1
&& tok
!= TOK_ASM2
&& tok
!= TOK_ASM3
) {
6831 if (!parse_btype(&btype
, &ad
))
6832 expect("declaration list");
6833 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
6834 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
6836 /* we accept no variable after */
6840 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
6841 /* find parameter in function parameter list */
6844 if ((s
->v
& ~SYM_FIELD
) == v
)
6848 tcc_error("declaration for parameter '%s' but no such parameter",
6849 get_tok_str(v
, NULL
));
6851 /* check that no storage specifier except 'register' was given */
6852 if (type
.t
& VT_STORAGE
)
6853 tcc_error("storage class specified for '%s'", get_tok_str(v
, NULL
));
6854 convert_parameter_type(&type
);
6855 /* we can add the type (NOTE: it could be local to the function) */
6857 /* accept other parameters */
6868 /* parse a function defined by symbol 'sym' and generate its code in
6869 'cur_text_section' */
6870 static void gen_function(Sym
*sym
)
6872 int saved_nocode_wanted
= nocode_wanted
;
6875 ind
= cur_text_section
->data_offset
;
6876 /* NOTE: we patch the symbol size later */
6877 put_extern_sym(sym
, cur_text_section
, ind
, 0);
6878 funcname
= get_tok_str(sym
->v
, NULL
);
6880 /* Initialize VLA state */
6882 vla_sp_root_loc
= -1;
6883 /* put debug symbol */
6884 if (tcc_state
->do_debug
)
6885 put_func_debug(sym
);
6887 /* push a dummy symbol to enable local sym storage */
6888 sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
6889 local_scope
= 1; /* for function parameters */
6890 gfunc_prolog(&sym
->type
);
6894 block(NULL
, NULL
, 0);
6897 cur_text_section
->data_offset
= ind
;
6898 label_pop(&global_label_stack
, NULL
);
6899 /* reset local stack */
6901 sym_pop(&local_stack
, NULL
, 0);
6902 /* end of function */
6903 /* patch symbol size */
6904 ((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
].st_size
=
6906 /* patch symbol weakness (this definition overrules any prototype) */
6907 if (sym
->type
.t
& VT_WEAK
)
6909 apply_visibility(sym
, &sym
->type
);
6910 if (tcc_state
->do_debug
) {
6911 put_stabn(N_FUN
, 0, 0, ind
- func_ind
);
6913 /* It's better to crash than to generate wrong code */
6914 cur_text_section
= NULL
;
6915 funcname
= ""; /* for safety */
6916 func_vt
.t
= VT_VOID
; /* for safety */
6917 func_var
= 0; /* for safety */
6918 ind
= 0; /* for safety */
6919 nocode_wanted
= saved_nocode_wanted
;
6923 static void gen_inline_functions(TCCState
*s
)
6926 int inline_generated
, i
, ln
;
6927 struct InlineFunc
*fn
;
6929 ln
= file
->line_num
;
6930 /* iterate while inline function are referenced */
6932 inline_generated
= 0;
6933 for (i
= 0; i
< s
->nb_inline_fns
; ++i
) {
6934 fn
= s
->inline_fns
[i
];
6936 if (sym
&& sym
->c
) {
6937 /* the function was used: generate its code and
6938 convert it to a normal function */
6941 pstrcpy(file
->filename
, sizeof file
->filename
, fn
->filename
);
6942 sym
->r
= VT_SYM
| VT_CONST
;
6943 sym
->type
.t
&= ~VT_INLINE
;
6945 begin_macro(fn
->func_str
, 1);
6947 cur_text_section
= text_section
;
6951 inline_generated
= 1;
6954 if (!inline_generated
)
6957 file
->line_num
= ln
;
6960 ST_FUNC
void free_inline_functions(TCCState
*s
)
6963 /* free tokens of unused inline functions */
6964 for (i
= 0; i
< s
->nb_inline_fns
; ++i
) {
6965 struct InlineFunc
*fn
= s
->inline_fns
[i
];
6967 tok_str_free(fn
->func_str
);
6969 dynarray_reset(&s
->inline_fns
, &s
->nb_inline_fns
);
6972 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
6973 static int decl0(int l
, int is_for_loop_init
)
6981 if (!parse_btype(&btype
, &ad
)) {
6982 if (is_for_loop_init
)
6984 /* skip redundant ';' */
6985 /* XXX: find more elegant solution */
6990 if (l
== VT_CONST
&&
6991 (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
6992 /* global asm block */
6996 /* special test for old K&R protos without explicit int
6997 type. Only accepted when defining global data */
6998 if (l
== VT_LOCAL
|| tok
< TOK_UIDENT
)
7002 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
7003 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
7005 if ((btype
.t
& VT_BTYPE
) == VT_STRUCT
) {
7006 int v
= btype
.ref
->v
;
7007 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) >= SYM_FIRST_ANOM
)
7008 tcc_warning("unnamed struct/union that defines no instances");
7013 while (1) { /* iterate thru each declaration */
7015 /* If the base type itself was an array type of unspecified
7016 size (like in 'typedef int arr[]; arr x = {1};') then
7017 we will overwrite the unknown size by the real one for
7018 this decl. We need to unshare the ref symbol holding
7020 if ((type
.t
& VT_ARRAY
) && type
.ref
->c
< 0) {
7021 type
.ref
= sym_push(SYM_FIELD
, &type
.ref
->type
, 0, type
.ref
->c
);
7023 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
7027 type_to_str(buf
, sizeof(buf
), t
, get_tok_str(v
, NULL
));
7028 printf("type = '%s'\n", buf
);
7031 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
7032 if ((type
.t
& VT_STATIC
) && (l
== VT_LOCAL
)) {
7033 tcc_error("function without file scope cannot be static");
7035 /* if old style function prototype, we accept a
7038 if (sym
->c
== FUNC_OLD
)
7039 func_decl_list(sym
);
7042 if (gnu_ext
&& (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
7043 ad
.asm_label
= asm_label_instr();
7044 /* parse one last attribute list, after asm label */
7045 parse_attribute(&ad
);
7052 #ifdef TCC_TARGET_PE
7053 if (ad
.a
.func_import
)
7054 type
.t
|= VT_IMPORT
;
7055 if (ad
.a
.func_export
)
7056 type
.t
|= VT_EXPORT
;
7058 type
.t
|= ad
.a
.visibility
<< VT_VIS_SHIFT
;
7062 tcc_error("cannot use local functions");
7063 if ((type
.t
& VT_BTYPE
) != VT_FUNC
)
7064 expect("function definition");
7066 /* reject abstract declarators in function definition */
7068 while ((sym
= sym
->next
) != NULL
)
7069 if (!(sym
->v
& ~SYM_FIELD
))
7070 expect("identifier");
7072 /* XXX: cannot do better now: convert extern line to static inline */
7073 if ((type
.t
& (VT_EXTERN
| VT_INLINE
)) == (VT_EXTERN
| VT_INLINE
))
7074 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
7079 if ((sym
->type
.t
& VT_BTYPE
) != VT_FUNC
)
7082 ref
= sym
->type
.ref
;
7083 if (0 == ref
->a
.func_proto
)
7084 tcc_error("redefinition of '%s'", get_tok_str(v
, NULL
));
7086 /* use func_call from prototype if not defined */
7087 if (ref
->a
.func_call
!= FUNC_CDECL
7088 && type
.ref
->a
.func_call
== FUNC_CDECL
)
7089 type
.ref
->a
.func_call
= ref
->a
.func_call
;
7091 /* use export from prototype */
7092 if (ref
->a
.func_export
)
7093 type
.ref
->a
.func_export
= 1;
7095 /* use static from prototype */
7096 if (sym
->type
.t
& VT_STATIC
)
7097 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
7099 /* If the definition has no visibility use the
7100 one from prototype. */
7101 if (! (type
.t
& VT_VIS_MASK
))
7102 type
.t
|= sym
->type
.t
& VT_VIS_MASK
;
7104 if (!is_compatible_types(&sym
->type
, &type
)) {
7106 tcc_error("incompatible types for redefinition of '%s'",
7107 get_tok_str(v
, NULL
));
7109 type
.ref
->a
.func_proto
= 0;
7110 /* if symbol is already defined, then put complete type */
7113 /* put function symbol */
7114 sym
= global_identifier_push(v
, type
.t
, 0);
7115 sym
->type
.ref
= type
.ref
;
7118 /* static inline functions are just recorded as a kind
7119 of macro. Their code will be emitted at the end of
7120 the compilation unit only if they are used */
7121 if ((type
.t
& (VT_INLINE
| VT_STATIC
)) ==
7122 (VT_INLINE
| VT_STATIC
)) {
7124 struct InlineFunc
*fn
;
7125 const char *filename
;
7127 filename
= file
? file
->filename
: "";
7128 fn
= tcc_malloc(sizeof *fn
+ strlen(filename
));
7129 strcpy(fn
->filename
, filename
);
7131 fn
->func_str
= tok_str_alloc();
7137 tcc_error("unexpected end of file");
7138 tok_str_add_tok(fn
->func_str
);
7143 } else if (t
== '}') {
7145 if (block_level
== 0)
7149 tok_str_add(fn
->func_str
, -1);
7150 tok_str_add(fn
->func_str
, 0);
7151 dynarray_add((void ***)&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
, fn
);
7154 /* compute text section */
7155 cur_text_section
= ad
.section
;
7156 if (!cur_text_section
)
7157 cur_text_section
= text_section
;
7158 sym
->r
= VT_SYM
| VT_CONST
;
7163 if (btype
.t
& VT_TYPEDEF
) {
7164 /* save typedefed type */
7165 /* XXX: test storage specifiers ? */
7167 if (sym
&& sym
->scope
== local_scope
) {
7168 if (!is_compatible_types(&sym
->type
, &type
)
7169 || !(sym
->type
.t
& VT_TYPEDEF
))
7170 tcc_error("incompatible redefinition of '%s'",
7171 get_tok_str(v
, NULL
));
7174 sym
= sym_push(v
, &type
, 0, 0);
7177 sym
->type
.t
|= VT_TYPEDEF
;
7180 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
7181 /* external function definition */
7182 /* specific case for func_call attribute */
7183 ad
.a
.func_proto
= 1;
7185 } else if (!(type
.t
& VT_ARRAY
)) {
7186 /* not lvalue if array */
7187 r
|= lvalue_type(type
.t
);
7189 has_init
= (tok
== '=');
7190 if (has_init
&& (type
.t
& VT_VLA
))
7191 tcc_error("variable length array cannot be initialized");
7192 if ((btype
.t
& VT_EXTERN
) || ((type
.t
& VT_BTYPE
) == VT_FUNC
) ||
7193 ((type
.t
& VT_ARRAY
) && (type
.t
& VT_STATIC
) &&
7194 !has_init
&& l
== VT_CONST
&& type
.ref
->c
< 0)) {
7195 /* external variable or function */
7196 /* NOTE: as GCC, uninitialized global static
7197 arrays of null size are considered as
7199 sym
= external_sym(v
, &type
, r
);
7200 sym
->asm_label
= ad
.asm_label
;
7202 if (ad
.alias_target
) {
7207 alias_target
= sym_find(ad
.alias_target
);
7208 if (!alias_target
|| !alias_target
->c
)
7209 tcc_error("unsupported forward __alias__ attribute");
7210 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[alias_target
->c
];
7211 tsec
.sh_num
= esym
->st_shndx
;
7212 put_extern_sym2(sym
, &tsec
, esym
->st_value
, esym
->st_size
, 0);
7215 type
.t
|= (btype
.t
& VT_STATIC
); /* Retain "static". */
7216 if (type
.t
& VT_STATIC
)
7222 decl_initializer_alloc(&type
, &ad
, r
, has_init
, v
, l
);
7226 if (is_for_loop_init
)
7239 ST_FUNC
void decl(int l
)
7244 /* ------------------------------------------------------------------------- */