2 * TCC - Tiny C Compiler
4 * Copyright (c) 2001-2004 Fabrice Bellard
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 /********************************************************/
24 /* global variables */
26 /* loc : local variable index
27 ind : output code index
29 anon_sym: anonymous symbol index
31 ST_DATA
int rsym
, anon_sym
, ind
, loc
;
33 ST_DATA Sym
*sym_free_first
;
34 ST_DATA
void **sym_pools
;
35 ST_DATA
int nb_sym_pools
;
37 ST_DATA Sym
*global_stack
;
38 ST_DATA Sym
*local_stack
;
39 ST_DATA Sym
*define_stack
;
40 ST_DATA Sym
*global_label_stack
;
41 ST_DATA Sym
*local_label_stack
;
42 static int local_scope
;
44 static int section_sym
;
46 ST_DATA
int vlas_in_scope
; /* number of VLAs that are currently in scope */
47 ST_DATA
int vla_sp_root_loc
; /* vla_sp_loc for SP before any VLAs were pushed */
48 ST_DATA
int vla_sp_loc
; /* Pointer to variable holding location to store stack pointer on the stack when modifying stack pointer */
50 ST_DATA SValue __vstack
[1+VSTACK_SIZE
], *vtop
, *pvtop
;
52 ST_DATA
int const_wanted
; /* true if constant wanted */
53 ST_DATA
int nocode_wanted
; /* true if no code generation wanted for an expression */
54 ST_DATA
int global_expr
; /* true if compound literals must be allocated globally (used during initializers parsing */
55 ST_DATA CType func_vt
; /* current function return type (used by return instruction) */
56 ST_DATA
int func_var
; /* true if current function is variadic (used by return instruction) */
58 ST_DATA
int last_line_num
, last_ind
, func_ind
; /* debug last line number and pc */
59 ST_DATA
const char *funcname
;
61 ST_DATA CType char_pointer_type
, func_old_type
, int_type
, size_type
;
63 ST_DATA
struct switch_t
{
67 } **p
; int n
; /* list of case ranges */
68 int def_sym
; /* default symbol */
69 } *cur_switch
; /* current switch */
71 /* ------------------------------------------------------------------------- */
72 static void gen_cast(CType
*type
);
73 static inline CType
*pointed_type(CType
*type
);
74 static int is_compatible_types(CType
*type1
, CType
*type2
);
75 static int parse_btype(CType
*type
, AttributeDef
*ad
);
76 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
);
77 static void parse_expr_type(CType
*type
);
78 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
, int first
, int size_only
);
79 static void block(int *bsym
, int *csym
, int is_expr
);
80 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
, int has_init
, int v
, int scope
);
81 static int decl0(int l
, int is_for_loop_init
);
82 static void expr_eq(void);
83 static void expr_lor_const(void);
84 static void unary_type(CType
*type
);
85 static void vla_runtime_type_size(CType
*type
, int *a
);
86 static void vla_sp_restore(void);
87 static void vla_sp_restore_root(void);
88 static int is_compatible_parameter_types(CType
*type1
, CType
*type2
);
89 static void expr_type(CType
*type
);
90 static inline int64_t expr_const64(void);
91 ST_FUNC
void vpush64(int ty
, unsigned long long v
);
92 ST_FUNC
void vpush(CType
*type
);
93 ST_FUNC
int gvtst(int inv
, int t
);
94 ST_FUNC
int is_btype_size(int bt
);
95 static void gen_inline_functions(TCCState
*s
);
97 ST_INLN
int is_float(int t
)
101 return bt
== VT_LDOUBLE
|| bt
== VT_DOUBLE
|| bt
== VT_FLOAT
|| bt
== VT_QFLOAT
;
104 /* we use our own 'finite' function to avoid potential problems with
105 non standard math libs */
106 /* XXX: endianness dependent */
107 ST_FUNC
int ieee_finite(double d
)
110 memcpy(p
, &d
, sizeof(double));
111 return ((unsigned)((p
[1] | 0x800fffff) + 1)) >> 31;
114 ST_FUNC
void test_lvalue(void)
116 if (!(vtop
->r
& VT_LVAL
))
120 ST_FUNC
void check_vstack(void)
123 tcc_error("internal compiler error: vstack leak (%d)", vtop
- pvtop
);
126 /* ------------------------------------------------------------------------- */
127 /* vstack debugging aid */
130 void pv (const char *lbl
, int a
, int b
)
133 for (i
= a
; i
< a
+ b
; ++i
) {
134 SValue
*p
= &vtop
[-i
];
135 printf("%s vtop[-%d] : type.t:%04x r:%04x r2:%04x c.i:%d\n",
136 lbl
, i
, p
->type
.t
, p
->r
, p
->r2
, (int)p
->c
.i
);
141 /* ------------------------------------------------------------------------- */
142 ST_FUNC
void tccgen_start(TCCState
*s1
)
144 cur_text_section
= NULL
;
146 anon_sym
= SYM_FIRST_ANOM
;
150 /* define some often used types */
152 char_pointer_type
.t
= VT_BYTE
;
153 mk_pointer(&char_pointer_type
);
155 size_type
.t
= VT_INT
;
157 size_type
.t
= VT_LLONG
;
159 func_old_type
.t
= VT_FUNC
;
160 func_old_type
.ref
= sym_push(SYM_FIELD
, &int_type
, FUNC_CDECL
, FUNC_OLD
);
165 /* file info: full path + filename */
166 section_sym
= put_elf_sym(symtab_section
, 0, 0,
167 ELFW(ST_INFO
)(STB_LOCAL
, STT_SECTION
), 0,
168 text_section
->sh_num
, NULL
);
169 getcwd(buf
, sizeof(buf
));
171 normalize_slashes(buf
);
173 pstrcat(buf
, sizeof(buf
), "/");
174 put_stabs_r(buf
, N_SO
, 0, 0,
175 text_section
->data_offset
, text_section
, section_sym
);
176 put_stabs_r(file
->filename
, N_SO
, 0, 0,
177 text_section
->data_offset
, text_section
, section_sym
);
179 /* an elf symbol of type STT_FILE must be put so that STB_LOCAL
180 symbols can be safely used */
181 put_elf_sym(symtab_section
, 0, 0,
182 ELFW(ST_INFO
)(STB_LOCAL
, STT_FILE
), 0,
183 SHN_ABS
, file
->filename
);
185 #ifdef TCC_TARGET_ARM
190 ST_FUNC
void tccgen_end(TCCState
*s1
)
192 gen_inline_functions(s1
);
194 /* end of translation unit info */
196 put_stabs_r(NULL
, N_SO
, 0, 0,
197 text_section
->data_offset
, text_section
, section_sym
);
201 /* ------------------------------------------------------------------------- */
202 /* update sym->c so that it points to an external symbol in section
203 'section' with value 'value' */
205 ST_FUNC
void put_extern_sym2(Sym
*sym
, Section
*section
,
206 addr_t value
, unsigned long size
,
207 int can_add_underscore
)
209 int sym_type
, sym_bind
, sh_num
, info
, other
;
214 #ifdef CONFIG_TCC_BCHECK
220 else if (section
== SECTION_ABS
)
223 sh_num
= section
->sh_num
;
225 if ((sym
->type
.t
& VT_BTYPE
) == VT_FUNC
) {
227 } else if ((sym
->type
.t
& VT_BTYPE
) == VT_VOID
) {
228 sym_type
= STT_NOTYPE
;
230 sym_type
= STT_OBJECT
;
233 if (sym
->type
.t
& VT_STATIC
)
234 sym_bind
= STB_LOCAL
;
236 if (sym
->type
.t
& VT_WEAK
)
239 sym_bind
= STB_GLOBAL
;
243 name
= get_tok_str(sym
->v
, NULL
);
244 #ifdef CONFIG_TCC_BCHECK
245 if (tcc_state
->do_bounds_check
) {
246 /* XXX: avoid doing that for statics ? */
247 /* if bound checking is activated, we change some function
248 names by adding the "__bound" prefix */
251 /* XXX: we rely only on malloc hooks */
264 strcpy(buf
, "__bound_");
274 if (sym
->type
.t
& VT_EXPORT
)
275 other
|= ST_PE_EXPORT
;
276 if (sym_type
== STT_FUNC
&& sym
->type
.ref
) {
277 Sym
*ref
= sym
->type
.ref
;
278 if (ref
->a
.func_export
)
279 other
|= ST_PE_EXPORT
;
280 if (ref
->a
.func_call
== FUNC_STDCALL
&& can_add_underscore
) {
281 sprintf(buf1
, "_%s@%d", name
, ref
->a
.func_args
* PTR_SIZE
);
283 other
|= ST_PE_STDCALL
;
284 can_add_underscore
= 0;
287 if (find_elf_sym(tcc_state
->dynsymtab_section
, name
))
288 other
|= ST_PE_IMPORT
;
289 if (sym
->type
.t
& VT_IMPORT
)
290 other
|= ST_PE_IMPORT
;
293 if (! (sym
->type
.t
& VT_STATIC
))
294 other
= (sym
->type
.t
& VT_VIS_MASK
) >> VT_VIS_SHIFT
;
296 if (tcc_state
->leading_underscore
&& can_add_underscore
) {
298 pstrcpy(buf1
+ 1, sizeof(buf1
) - 1, name
);
301 if (sym
->asm_label
) {
302 name
= get_tok_str(sym
->asm_label
, NULL
);
304 info
= ELFW(ST_INFO
)(sym_bind
, sym_type
);
305 sym
->c
= set_elf_sym(symtab_section
, value
, size
, info
, other
, sh_num
, name
);
307 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
308 esym
->st_value
= value
;
309 esym
->st_size
= size
;
310 esym
->st_shndx
= sh_num
;
314 ST_FUNC
void put_extern_sym(Sym
*sym
, Section
*section
,
315 addr_t value
, unsigned long size
)
317 put_extern_sym2(sym
, section
, value
, size
, 1);
320 /* add a new relocation entry to symbol 'sym' in section 's' */
321 ST_FUNC
void greloca(Section
*s
, Sym
*sym
, unsigned long offset
, int type
,
327 put_extern_sym(sym
, NULL
, 0, 0);
330 /* now we can add ELF relocation info */
331 put_elf_reloca(symtab_section
, s
, offset
, type
, c
, addend
);
334 ST_FUNC
void greloc(Section
*s
, Sym
*sym
, unsigned long offset
, int type
)
336 greloca(s
, sym
, offset
, type
, 0);
339 /* ------------------------------------------------------------------------- */
340 /* symbol allocator */
341 static Sym
*__sym_malloc(void)
343 Sym
*sym_pool
, *sym
, *last_sym
;
346 sym_pool
= tcc_malloc(SYM_POOL_NB
* sizeof(Sym
));
347 dynarray_add(&sym_pools
, &nb_sym_pools
, sym_pool
);
349 last_sym
= sym_free_first
;
351 for(i
= 0; i
< SYM_POOL_NB
; i
++) {
352 sym
->next
= last_sym
;
356 sym_free_first
= last_sym
;
360 static inline Sym
*sym_malloc(void)
364 sym
= sym_free_first
;
366 sym
= __sym_malloc();
367 sym_free_first
= sym
->next
;
370 sym
= tcc_malloc(sizeof(Sym
));
375 ST_INLN
void sym_free(Sym
*sym
)
378 sym
->next
= sym_free_first
;
379 sym_free_first
= sym
;
385 /* push, without hashing */
386 ST_FUNC Sym
*sym_push2(Sym
**ps
, int v
, int t
, long c
)
406 /* find a symbol and return its associated structure. 's' is the top
407 of the symbol stack */
408 ST_FUNC Sym
*sym_find2(Sym
*s
, int v
)
420 /* structure lookup */
421 ST_INLN Sym
*struct_find(int v
)
424 if ((unsigned)v
>= (unsigned)(tok_ident
- TOK_IDENT
))
426 return table_ident
[v
]->sym_struct
;
429 /* find an identifier */
430 ST_INLN Sym
*sym_find(int v
)
433 if ((unsigned)v
>= (unsigned)(tok_ident
- TOK_IDENT
))
435 return table_ident
[v
]->sym_identifier
;
438 /* push a given symbol on the symbol stack */
439 ST_FUNC Sym
*sym_push(int v
, CType
*type
, int r
, long c
)
448 s
= sym_push2(ps
, v
, type
->t
, c
);
449 s
->type
.ref
= type
->ref
;
451 /* don't record fields or anonymous symbols */
453 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
454 /* record symbol in token array */
455 ts
= table_ident
[(v
& ~SYM_STRUCT
) - TOK_IDENT
];
457 ps
= &ts
->sym_struct
;
459 ps
= &ts
->sym_identifier
;
462 s
->scope
= local_scope
;
463 if (s
->prev_tok
&& s
->prev_tok
->scope
== s
->scope
)
464 tcc_error("redeclaration of '%s'",
465 get_tok_str(v
& ~SYM_STRUCT
, NULL
));
470 /* push a global identifier */
471 ST_FUNC Sym
*global_identifier_push(int v
, int t
, long c
)
474 s
= sym_push2(&global_stack
, v
, t
, c
);
475 /* don't record anonymous symbol */
476 if (v
< SYM_FIRST_ANOM
) {
477 ps
= &table_ident
[v
- TOK_IDENT
]->sym_identifier
;
478 /* modify the top most local identifier, so that
479 sym_identifier will point to 's' when popped */
481 ps
= &(*ps
)->prev_tok
;
488 /* pop symbols until top reaches 'b'. If KEEP is non-zero don't really
489 pop them yet from the list, but do remove them from the token array. */
490 ST_FUNC
void sym_pop(Sym
**ptop
, Sym
*b
, int keep
)
500 /* remove symbol in token array */
502 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
503 ts
= table_ident
[(v
& ~SYM_STRUCT
) - TOK_IDENT
];
505 ps
= &ts
->sym_struct
;
507 ps
= &ts
->sym_identifier
;
518 static void weaken_symbol(Sym
*sym
)
520 sym
->type
.t
|= VT_WEAK
;
525 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
526 esym_type
= ELFW(ST_TYPE
)(esym
->st_info
);
527 esym
->st_info
= ELFW(ST_INFO
)(STB_WEAK
, esym_type
);
531 static void apply_visibility(Sym
*sym
, CType
*type
)
533 int vis
= sym
->type
.t
& VT_VIS_MASK
;
534 int vis2
= type
->t
& VT_VIS_MASK
;
535 if (vis
== (STV_DEFAULT
<< VT_VIS_SHIFT
))
537 else if (vis2
== (STV_DEFAULT
<< VT_VIS_SHIFT
))
540 vis
= (vis
< vis2
) ? vis
: vis2
;
541 sym
->type
.t
&= ~VT_VIS_MASK
;
547 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
548 vis
>>= VT_VIS_SHIFT
;
549 esym
->st_other
= (esym
->st_other
& ~ELFW(ST_VISIBILITY
)(-1)) | vis
;
553 /* ------------------------------------------------------------------------- */
555 ST_FUNC
void swap(int *p
, int *q
)
563 static void vsetc(CType
*type
, int r
, CValue
*vc
)
567 if (vtop
>= vstack
+ (VSTACK_SIZE
- 1))
568 tcc_error("memory full (vstack)");
569 /* cannot let cpu flags if other instruction are generated. Also
570 avoid leaving VT_JMP anywhere except on the top of the stack
571 because it would complicate the code generator. */
572 if (vtop
>= vstack
) {
573 v
= vtop
->r
& VT_VALMASK
;
574 if (v
== VT_CMP
|| (v
& ~1) == VT_JMP
)
585 /* push constant of type "type" with useless value */
586 ST_FUNC
void vpush(CType
*type
)
589 vsetc(type
, VT_CONST
, &cval
);
592 /* push integer constant */
593 ST_FUNC
void vpushi(int v
)
597 vsetc(&int_type
, VT_CONST
, &cval
);
600 /* push a pointer sized constant */
601 static void vpushs(addr_t v
)
605 vsetc(&size_type
, VT_CONST
, &cval
);
608 /* push arbitrary 64bit constant */
609 ST_FUNC
void vpush64(int ty
, unsigned long long v
)
616 vsetc(&ctype
, VT_CONST
, &cval
);
619 /* push long long constant */
620 static inline void vpushll(long long v
)
622 vpush64(VT_LLONG
, v
);
625 /* push a symbol value of TYPE */
626 static inline void vpushsym(CType
*type
, Sym
*sym
)
630 vsetc(type
, VT_CONST
| VT_SYM
, &cval
);
634 /* Return a static symbol pointing to a section */
635 ST_FUNC Sym
*get_sym_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
641 sym
= global_identifier_push(v
, type
->t
| VT_STATIC
, 0);
642 sym
->type
.ref
= type
->ref
;
643 sym
->r
= VT_CONST
| VT_SYM
;
644 put_extern_sym(sym
, sec
, offset
, size
);
648 /* push a reference to a section offset by adding a dummy symbol */
649 static void vpush_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
651 vpushsym(type
, get_sym_ref(type
, sec
, offset
, size
));
654 /* define a new external reference to a symbol 'v' of type 'u' */
655 ST_FUNC Sym
*external_global_sym(int v
, CType
*type
, int r
)
661 /* push forward reference */
662 s
= global_identifier_push(v
, type
->t
| VT_EXTERN
, 0);
663 s
->type
.ref
= type
->ref
;
664 s
->r
= r
| VT_CONST
| VT_SYM
;
669 /* define a new external reference to a symbol 'v' */
670 static Sym
*external_sym(int v
, CType
*type
, int r
)
676 /* push forward reference */
677 s
= sym_push(v
, type
, r
| VT_CONST
| VT_SYM
, 0);
678 s
->type
.t
|= VT_EXTERN
;
679 } else if (s
->type
.ref
== func_old_type
.ref
) {
680 s
->type
.ref
= type
->ref
;
681 s
->r
= r
| VT_CONST
| VT_SYM
;
682 s
->type
.t
|= VT_EXTERN
;
683 } else if (!is_compatible_types(&s
->type
, type
)) {
684 tcc_error("incompatible types for redefinition of '%s'",
685 get_tok_str(v
, NULL
));
687 /* Merge some storage attributes. */
688 if (type
->t
& VT_WEAK
)
691 if (type
->t
& VT_VIS_MASK
)
692 apply_visibility(s
, type
);
697 /* push a reference to global symbol v */
698 ST_FUNC
void vpush_global_sym(CType
*type
, int v
)
700 vpushsym(type
, external_global_sym(v
, type
, 0));
703 ST_FUNC
void vset(CType
*type
, int r
, long v
)
708 vsetc(type
, r
, &cval
);
711 static void vseti(int r
, int v
)
719 ST_FUNC
void vswap(void)
722 /* cannot let cpu flags if other instruction are generated. Also
723 avoid leaving VT_JMP anywhere except on the top of the stack
724 because it would complicate the code generator. */
725 if (vtop
>= vstack
) {
726 int v
= vtop
->r
& VT_VALMASK
;
727 if (v
== VT_CMP
|| (v
& ~1) == VT_JMP
)
734 /* XXX: +2% overall speed possible with optimized memswap
736 * memswap(&vtop[0], &vtop[1], sizeof *vtop);
740 ST_FUNC
void vpushv(SValue
*v
)
742 if (vtop
>= vstack
+ (VSTACK_SIZE
- 1))
743 tcc_error("memory full (vstack)");
748 static void vdup(void)
753 /* save registers up to (vtop - n) stack entry */
754 ST_FUNC
void save_regs(int n
)
757 for(p
= vstack
, p1
= vtop
- n
; p
<= p1
; p
++)
761 /* save r to the memory stack, and mark it as being free */
762 ST_FUNC
void save_reg(int r
)
764 save_reg_upstack(r
, 0);
767 /* save r to the memory stack, and mark it as being free,
768 if seen up to (vtop - n) stack entry */
769 ST_FUNC
void save_reg_upstack(int r
, int n
)
771 int l
, saved
, size
, align
;
775 if ((r
&= VT_VALMASK
) >= VT_CONST
)
778 /* modify all stack values */
781 for(p
= vstack
, p1
= vtop
- n
; p
<= p1
; p
++) {
782 if ((p
->r
& VT_VALMASK
) == r
||
783 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& (p
->r2
& VT_VALMASK
) == r
)) {
784 /* must save value on stack if not already done */
786 /* NOTE: must reload 'r' because r might be equal to r2 */
787 r
= p
->r
& VT_VALMASK
;
788 /* store register in the stack */
790 if ((p
->r
& VT_LVAL
) ||
791 (!is_float(type
->t
) && (type
->t
& VT_BTYPE
) != VT_LLONG
))
792 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
793 type
= &char_pointer_type
;
797 size
= type_size(type
, &align
);
798 loc
= (loc
- size
) & -align
;
800 sv
.r
= VT_LOCAL
| VT_LVAL
;
803 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
804 /* x86 specific: need to pop fp register ST0 if saved */
806 o(0xd8dd); /* fstp %st(0) */
809 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
810 /* special long long case */
811 if ((type
->t
& VT_BTYPE
) == VT_LLONG
) {
819 /* mark that stack entry as being saved on the stack */
820 if (p
->r
& VT_LVAL
) {
821 /* also clear the bounded flag because the
822 relocation address of the function was stored in
824 p
->r
= (p
->r
& ~(VT_VALMASK
| VT_BOUNDED
)) | VT_LLOCAL
;
826 p
->r
= lvalue_type(p
->type
.t
) | VT_LOCAL
;
834 #ifdef TCC_TARGET_ARM
835 /* find a register of class 'rc2' with at most one reference on stack.
836 * If none, call get_reg(rc) */
837 ST_FUNC
int get_reg_ex(int rc
, int rc2
)
842 for(r
=0;r
<NB_REGS
;r
++) {
843 if (reg_classes
[r
] & rc2
) {
846 for(p
= vstack
; p
<= vtop
; p
++) {
847 if ((p
->r
& VT_VALMASK
) == r
||
848 (p
->r2
& VT_VALMASK
) == r
)
859 /* find a free register of class 'rc'. If none, save one register */
860 ST_FUNC
int get_reg(int rc
)
865 /* find a free register */
866 for(r
=0;r
<NB_REGS
;r
++) {
867 if (reg_classes
[r
] & rc
) {
868 for(p
=vstack
;p
<=vtop
;p
++) {
869 if ((p
->r
& VT_VALMASK
) == r
||
870 (p
->r2
& VT_VALMASK
) == r
)
878 /* no register left : free the first one on the stack (VERY
879 IMPORTANT to start from the bottom to ensure that we don't
880 spill registers used in gen_opi()) */
881 for(p
=vstack
;p
<=vtop
;p
++) {
882 /* look at second register (if long long) */
883 r
= p
->r2
& VT_VALMASK
;
884 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
))
886 r
= p
->r
& VT_VALMASK
;
887 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
)) {
893 /* Should never comes here */
897 /* move register 's' (of type 't') to 'r', and flush previous value of r to memory
899 static void move_reg(int r
, int s
, int t
)
913 /* get address of vtop (vtop MUST BE an lvalue) */
914 ST_FUNC
void gaddrof(void)
916 if (vtop
->r
& VT_REF
&& !nocode_wanted
)
919 /* tricky: if saved lvalue, then we can go back to lvalue */
920 if ((vtop
->r
& VT_VALMASK
) == VT_LLOCAL
)
921 vtop
->r
= (vtop
->r
& ~(VT_VALMASK
| VT_LVAL_TYPE
)) | VT_LOCAL
| VT_LVAL
;
926 #ifdef CONFIG_TCC_BCHECK
927 /* generate lvalue bound code */
928 static void gbound(void)
933 vtop
->r
&= ~VT_MUSTBOUND
;
934 /* if lvalue, then use checking code before dereferencing */
935 if (vtop
->r
& VT_LVAL
) {
936 /* if not VT_BOUNDED value, then make one */
937 if (!(vtop
->r
& VT_BOUNDED
)) {
938 lval_type
= vtop
->r
& (VT_LVAL_TYPE
| VT_LVAL
);
939 /* must save type because we must set it to int to get pointer */
941 vtop
->type
.t
= VT_PTR
;
944 gen_bounded_ptr_add();
945 vtop
->r
|= lval_type
;
948 /* then check for dereferencing */
949 gen_bounded_ptr_deref();
954 /* store vtop a register belonging to class 'rc'. lvalues are
955 converted to values. Cannot be used if cannot be converted to
956 register value (such as structures). */
957 ST_FUNC
int gv(int rc
)
959 int r
, bit_pos
, bit_size
, size
, align
, i
;
962 /* NOTE: get_reg can modify vstack[] */
963 if (vtop
->type
.t
& VT_BITFIELD
) {
966 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
967 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
968 /* remove bit field info to avoid loops */
969 vtop
->type
.t
&= ~VT_BITFIELD
& ((1 << VT_STRUCT_SHIFT
) - 1);
970 /* cast to int to propagate signedness in following ops */
971 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
976 if((vtop
->type
.t
& VT_UNSIGNED
) ||
977 (vtop
->type
.t
& VT_BTYPE
) == VT_BOOL
)
978 type
.t
|= VT_UNSIGNED
;
980 /* generate shifts */
981 vpushi(bits
- (bit_pos
+ bit_size
));
983 vpushi(bits
- bit_size
);
984 /* NOTE: transformed to SHR if unsigned */
988 if (is_float(vtop
->type
.t
) &&
989 (vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
992 unsigned long offset
;
993 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
997 /* XXX: unify with initializers handling ? */
998 /* CPUs usually cannot use float constants, so we store them
999 generically in data segment */
1000 size
= type_size(&vtop
->type
, &align
);
1001 offset
= (data_section
->data_offset
+ align
- 1) & -align
;
1002 data_section
->data_offset
= offset
;
1003 /* XXX: not portable yet */
1004 #if defined(__i386__) || defined(__x86_64__)
1005 /* Zero pad x87 tenbyte long doubles */
1006 if (size
== LDOUBLE_SIZE
) {
1007 vtop
->c
.tab
[2] &= 0xffff;
1008 #if LDOUBLE_SIZE == 16
1013 ptr
= section_ptr_add(data_section
, size
);
1015 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
1019 ptr
[i
] = vtop
->c
.tab
[size
-1-i
];
1023 ptr
[i
] = vtop
->c
.tab
[i
];
1024 sym
= get_sym_ref(&vtop
->type
, data_section
, offset
, size
<< 2);
1025 vtop
->r
|= VT_LVAL
| VT_SYM
;
1029 #ifdef CONFIG_TCC_BCHECK
1030 if (vtop
->r
& VT_MUSTBOUND
)
1034 r
= vtop
->r
& VT_VALMASK
;
1035 rc2
= (rc
& RC_FLOAT
) ? RC_FLOAT
: RC_INT
;
1036 #ifndef TCC_TARGET_ARM64
1039 #ifdef TCC_TARGET_X86_64
1040 else if (rc
== RC_FRET
)
1045 /* need to reload if:
1047 - lvalue (need to dereference pointer)
1048 - already a register, but not in the right class */
1050 || (vtop
->r
& VT_LVAL
)
1051 || !(reg_classes
[r
] & rc
)
1052 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1053 || ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
&& !(reg_classes
[vtop
->r2
] & rc2
))
1054 || ((vtop
->type
.t
& VT_BTYPE
) == VT_QFLOAT
&& !(reg_classes
[vtop
->r2
] & rc2
))
1056 || ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
&& !(reg_classes
[vtop
->r2
] & rc2
))
1061 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1062 if (((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) || ((vtop
->type
.t
& VT_BTYPE
) == VT_QFLOAT
)) {
1063 int addr_type
= VT_LLONG
, load_size
= 8, load_type
= ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) ? VT_LLONG
: VT_DOUBLE
;
1065 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
1066 int addr_type
= VT_INT
, load_size
= 4, load_type
= VT_INT
;
1067 unsigned long long ll
;
1069 int r2
, original_type
;
1070 original_type
= vtop
->type
.t
;
1071 /* two register type load : expand to two words
1073 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
1074 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
1077 vtop
->c
.i
= ll
; /* first word */
1079 vtop
->r
= r
; /* save register value */
1080 vpushi(ll
>> 32); /* second word */
1083 if (vtop
->r
& VT_LVAL
) {
1084 /* We do not want to modifier the long long
1085 pointer here, so the safest (and less
1086 efficient) is to save all the other registers
1087 in the stack. XXX: totally inefficient. */
1091 /* lvalue_save: save only if used further down the stack */
1092 save_reg_upstack(vtop
->r
, 1);
1094 /* load from memory */
1095 vtop
->type
.t
= load_type
;
1098 vtop
[-1].r
= r
; /* save register value */
1099 /* increment pointer to get second word */
1100 vtop
->type
.t
= addr_type
;
1105 vtop
->type
.t
= load_type
;
1107 /* move registers */
1110 vtop
[-1].r
= r
; /* save register value */
1111 vtop
->r
= vtop
[-1].r2
;
1113 /* Allocate second register. Here we rely on the fact that
1114 get_reg() tries first to free r2 of an SValue. */
1118 /* write second register */
1120 vtop
->type
.t
= original_type
;
1121 } else if ((vtop
->r
& VT_LVAL
) && !is_float(vtop
->type
.t
)) {
1123 /* lvalue of scalar type : need to use lvalue type
1124 because of possible cast */
1127 /* compute memory access type */
1128 if (vtop
->r
& VT_REF
)
1129 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1134 else if (vtop
->r
& VT_LVAL_BYTE
)
1136 else if (vtop
->r
& VT_LVAL_SHORT
)
1138 if (vtop
->r
& VT_LVAL_UNSIGNED
)
1142 /* restore wanted type */
1145 /* one register type load */
1150 #ifdef TCC_TARGET_C67
1151 /* uses register pairs for doubles */
1152 if ((vtop
->type
.t
& VT_BTYPE
) == VT_DOUBLE
)
1159 /* generate vtop[-1] and vtop[0] in resp. classes rc1 and rc2 */
1160 ST_FUNC
void gv2(int rc1
, int rc2
)
1164 /* generate more generic register first. But VT_JMP or VT_CMP
1165 values must be generated first in all cases to avoid possible
1167 v
= vtop
[0].r
& VT_VALMASK
;
1168 if (v
!= VT_CMP
&& (v
& ~1) != VT_JMP
&& rc1
<= rc2
) {
1173 /* test if reload is needed for first register */
1174 if ((vtop
[-1].r
& VT_VALMASK
) >= VT_CONST
) {
1184 /* test if reload is needed for first register */
1185 if ((vtop
[0].r
& VT_VALMASK
) >= VT_CONST
) {
1191 #ifndef TCC_TARGET_ARM64
1192 /* wrapper around RC_FRET to return a register by type */
1193 static int rc_fret(int t
)
1195 #ifdef TCC_TARGET_X86_64
1196 if (t
== VT_LDOUBLE
) {
1204 /* wrapper around REG_FRET to return a register by type */
1205 static int reg_fret(int t
)
1207 #ifdef TCC_TARGET_X86_64
1208 if (t
== VT_LDOUBLE
) {
1215 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
1216 /* expand 64bit on stack in two ints */
1217 static void lexpand(void)
1220 u
= vtop
->type
.t
& (VT_DEFSIGN
| VT_UNSIGNED
);
1221 v
= vtop
->r
& (VT_VALMASK
| VT_LVAL
);
1222 if (v
== VT_CONST
) {
1225 } else if (v
== (VT_LVAL
|VT_CONST
) || v
== (VT_LVAL
|VT_LOCAL
)) {
1231 vtop
[0].r
= vtop
[-1].r2
;
1232 vtop
[0].r2
= vtop
[-1].r2
= VT_CONST
;
1234 vtop
[0].type
.t
= vtop
[-1].type
.t
= VT_INT
| u
;
1238 #ifdef TCC_TARGET_ARM
1239 /* expand long long on stack */
1240 ST_FUNC
void lexpand_nr(void)
1244 u
= vtop
->type
.t
& (VT_DEFSIGN
| VT_UNSIGNED
);
1246 vtop
->r2
= VT_CONST
;
1247 vtop
->type
.t
= VT_INT
| u
;
1248 v
=vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
);
1249 if (v
== VT_CONST
) {
1250 vtop
[-1].c
.i
= vtop
->c
.i
;
1251 vtop
->c
.i
= vtop
->c
.i
>> 32;
1253 } else if (v
== (VT_LVAL
|VT_CONST
) || v
== (VT_LVAL
|VT_LOCAL
)) {
1255 vtop
->r
= vtop
[-1].r
;
1256 } else if (v
> VT_CONST
) {
1260 vtop
->r
= vtop
[-1].r2
;
1261 vtop
[-1].r2
= VT_CONST
;
1262 vtop
[-1].type
.t
= VT_INT
| u
;
1266 #if !defined(TCC_TARGET_X86_64) && !defined(TCC_TARGET_ARM64)
1267 /* build a long long from two ints */
1268 static void lbuild(int t
)
1270 gv2(RC_INT
, RC_INT
);
1271 vtop
[-1].r2
= vtop
[0].r
;
1272 vtop
[-1].type
.t
= t
;
1277 /* rotate n first stack elements to the bottom
1278 I1 ... In -> I2 ... In I1 [top is right]
1280 ST_FUNC
void vrotb(int n
)
1286 for(i
=-n
+1;i
!=0;i
++)
1287 vtop
[i
] = vtop
[i
+1];
1291 /* rotate the n elements before entry e towards the top
1292 I1 ... In ... -> In I1 ... I(n-1) ... [top is right]
1294 ST_FUNC
void vrote(SValue
*e
, int n
)
1300 for(i
= 0;i
< n
- 1; i
++)
1305 /* rotate n first stack elements to the top
1306 I1 ... In -> In I1 ... I(n-1) [top is right]
1308 ST_FUNC
void vrott(int n
)
1313 /* pop stack value */
1314 ST_FUNC
void vpop(void)
1317 v
= vtop
->r
& VT_VALMASK
;
1318 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
1319 /* for x86, we need to pop the FP stack */
1320 if (v
== TREG_ST0
&& !nocode_wanted
) {
1321 o(0xd8dd); /* fstp %st(0) */
1324 if (v
== VT_JMP
|| v
== VT_JMPI
) {
1325 /* need to put correct jump if && or || without test */
1331 /* convert stack entry to register and duplicate its value in another
1333 static void gv_dup(void)
1339 #if !defined(TCC_TARGET_X86_64) && !defined(TCC_TARGET_ARM64)
1340 if ((t
& VT_BTYPE
) == VT_LLONG
) {
1347 /* stack: H L L1 H1 */
1357 /* duplicate value */
1362 #ifdef TCC_TARGET_X86_64
1363 if ((t
& VT_BTYPE
) == VT_LDOUBLE
) {
1373 load(r1
, &sv
); /* move r to r1 */
1375 /* duplicates value */
1381 /* Generate value test
1383 * Generate a test for any value (jump, comparison and integers) */
1384 ST_FUNC
int gvtst(int inv
, int t
)
1386 int v
= vtop
->r
& VT_VALMASK
;
1387 if (v
!= VT_CMP
&& v
!= VT_JMP
&& v
!= VT_JMPI
) {
1391 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
1392 /* constant jmp optimization */
1393 if ((vtop
->c
.i
!= 0) != inv
)
1398 return gtst(inv
, t
);
1401 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
1402 /* generate CPU independent (unsigned) long long operations */
1403 static void gen_opl(int op
)
1405 int t
, a
, b
, op1
, c
, i
;
1407 unsigned short reg_iret
= REG_IRET
;
1408 unsigned short reg_lret
= REG_LRET
;
1414 func
= TOK___divdi3
;
1417 func
= TOK___udivdi3
;
1420 func
= TOK___moddi3
;
1423 func
= TOK___umoddi3
;
1430 /* call generic long long function */
1431 vpush_global_sym(&func_old_type
, func
);
1436 vtop
->r2
= reg_lret
;
1444 //pv("gen_opl A",0,2);
1450 /* stack: L1 H1 L2 H2 */
1455 vtop
[-2] = vtop
[-3];
1458 /* stack: H1 H2 L1 L2 */
1459 //pv("gen_opl B",0,4);
1465 /* stack: H1 H2 L1 L2 ML MH */
1468 /* stack: ML MH H1 H2 L1 L2 */
1472 /* stack: ML MH H1 L2 H2 L1 */
1477 /* stack: ML MH M1 M2 */
1480 } else if (op
== '+' || op
== '-') {
1481 /* XXX: add non carry method too (for MIPS or alpha) */
1487 /* stack: H1 H2 (L1 op L2) */
1490 gen_op(op1
+ 1); /* TOK_xxxC2 */
1493 /* stack: H1 H2 (L1 op L2) */
1496 /* stack: (L1 op L2) H1 H2 */
1498 /* stack: (L1 op L2) (H1 op H2) */
1506 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
1507 t
= vtop
[-1].type
.t
;
1511 /* stack: L H shift */
1513 /* constant: simpler */
1514 /* NOTE: all comments are for SHL. the other cases are
1515 done by swaping words */
1526 if (op
!= TOK_SAR
) {
1559 /* XXX: should provide a faster fallback on x86 ? */
1562 func
= TOK___ashrdi3
;
1565 func
= TOK___lshrdi3
;
1568 func
= TOK___ashldi3
;
1574 /* compare operations */
1580 /* stack: L1 H1 L2 H2 */
1582 vtop
[-1] = vtop
[-2];
1584 /* stack: L1 L2 H1 H2 */
1587 /* when values are equal, we need to compare low words. since
1588 the jump is inverted, we invert the test too. */
1591 else if (op1
== TOK_GT
)
1593 else if (op1
== TOK_ULT
)
1595 else if (op1
== TOK_UGT
)
1600 if (op1
!= TOK_NE
) {
1604 /* generate non equal test */
1605 /* XXX: NOT PORTABLE yet */
1609 #if defined(TCC_TARGET_I386)
1610 b
= psym(0x850f, 0);
1611 #elif defined(TCC_TARGET_ARM)
1613 o(0x1A000000 | encbranch(ind
, 0, 1));
1614 #elif defined(TCC_TARGET_C67) || defined(TCC_TARGET_ARM64)
1615 tcc_error("not implemented");
1617 #error not supported
1621 /* compare low. Always unsigned */
1625 else if (op1
== TOK_LE
)
1627 else if (op1
== TOK_GT
)
1629 else if (op1
== TOK_GE
)
1640 static uint64_t gen_opic_sdiv(uint64_t a
, uint64_t b
)
1642 uint64_t x
= (a
>> 63 ? -a
: a
) / (b
>> 63 ? -b
: b
);
1643 return (a
^ b
) >> 63 ? -x
: x
;
1646 static int gen_opic_lt(uint64_t a
, uint64_t b
)
1648 return (a
^ (uint64_t)1 << 63) < (b
^ (uint64_t)1 << 63);
1651 /* handle integer constant optimizations and various machine
1653 static void gen_opic(int op
)
1655 SValue
*v1
= vtop
- 1;
1657 int t1
= v1
->type
.t
& VT_BTYPE
;
1658 int t2
= v2
->type
.t
& VT_BTYPE
;
1659 int c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1660 int c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1661 uint64_t l1
= c1
? v1
->c
.i
: 0;
1662 uint64_t l2
= c2
? v2
->c
.i
: 0;
1663 int shm
= (t1
== VT_LLONG
) ? 63 : 31;
1665 if (t1
!= VT_LLONG
&& (PTR_SIZE
!= 8 || t1
!= VT_PTR
))
1666 l1
= ((uint32_t)l1
|
1667 (v1
->type
.t
& VT_UNSIGNED
? 0 : -(l1
& 0x80000000)));
1668 if (t2
!= VT_LLONG
&& (PTR_SIZE
!= 8 || t2
!= VT_PTR
))
1669 l2
= ((uint32_t)l2
|
1670 (v2
->type
.t
& VT_UNSIGNED
? 0 : -(l2
& 0x80000000)));
1674 case '+': l1
+= l2
; break;
1675 case '-': l1
-= l2
; break;
1676 case '&': l1
&= l2
; break;
1677 case '^': l1
^= l2
; break;
1678 case '|': l1
|= l2
; break;
1679 case '*': l1
*= l2
; break;
1686 /* if division by zero, generate explicit division */
1689 tcc_error("division by zero in constant");
1693 default: l1
= gen_opic_sdiv(l1
, l2
); break;
1694 case '%': l1
= l1
- l2
* gen_opic_sdiv(l1
, l2
); break;
1695 case TOK_UDIV
: l1
= l1
/ l2
; break;
1696 case TOK_UMOD
: l1
= l1
% l2
; break;
1699 case TOK_SHL
: l1
<<= (l2
& shm
); break;
1700 case TOK_SHR
: l1
>>= (l2
& shm
); break;
1702 l1
= (l1
>> 63) ? ~(~l1
>> (l2
& shm
)) : l1
>> (l2
& shm
);
1705 case TOK_ULT
: l1
= l1
< l2
; break;
1706 case TOK_UGE
: l1
= l1
>= l2
; break;
1707 case TOK_EQ
: l1
= l1
== l2
; break;
1708 case TOK_NE
: l1
= l1
!= l2
; break;
1709 case TOK_ULE
: l1
= l1
<= l2
; break;
1710 case TOK_UGT
: l1
= l1
> l2
; break;
1711 case TOK_LT
: l1
= gen_opic_lt(l1
, l2
); break;
1712 case TOK_GE
: l1
= !gen_opic_lt(l1
, l2
); break;
1713 case TOK_LE
: l1
= !gen_opic_lt(l2
, l1
); break;
1714 case TOK_GT
: l1
= gen_opic_lt(l2
, l1
); break;
1716 case TOK_LAND
: l1
= l1
&& l2
; break;
1717 case TOK_LOR
: l1
= l1
|| l2
; break;
1721 if (t1
!= VT_LLONG
&& (PTR_SIZE
!= 8 || t1
!= VT_PTR
))
1722 l1
= ((uint32_t)l1
|
1723 (v1
->type
.t
& VT_UNSIGNED
? 0 : -(l1
& 0x80000000)));
1727 /* if commutative ops, put c2 as constant */
1728 if (c1
&& (op
== '+' || op
== '&' || op
== '^' ||
1729 op
== '|' || op
== '*')) {
1731 c2
= c1
; //c = c1, c1 = c2, c2 = c;
1732 l2
= l1
; //l = l1, l1 = l2, l2 = l;
1734 if (!const_wanted
&&
1736 (op
== TOK_SHL
|| op
== TOK_SHR
|| op
== TOK_SAR
)) ||
1737 (l1
== -1 && op
== TOK_SAR
))) {
1738 /* treat (0 << x), (0 >> x) and (-1 >> x) as constant */
1740 } else if (!const_wanted
&&
1741 c2
&& ((l2
== 0 && (op
== '&' || op
== '*')) ||
1742 (l2
== -1 && op
== '|') ||
1743 (l2
== 0xffffffff && t2
!= VT_LLONG
&& op
== '|') ||
1744 (l2
== 1 && (op
== '%' || op
== TOK_UMOD
)))) {
1745 /* treat (x & 0), (x * 0), (x | -1) and (x % 1) as constant */
1750 } else if (c2
&& (((op
== '*' || op
== '/' || op
== TOK_UDIV
||
1753 ((op
== '+' || op
== '-' || op
== '|' || op
== '^' ||
1754 op
== TOK_SHL
|| op
== TOK_SHR
|| op
== TOK_SAR
) &&
1758 /* filter out NOP operations like x*1, x-0, x&-1... */
1760 } else if (c2
&& (op
== '*' || op
== TOK_PDIV
|| op
== TOK_UDIV
)) {
1761 /* try to use shifts instead of muls or divs */
1762 if (l2
> 0 && (l2
& (l2
- 1)) == 0) {
1771 else if (op
== TOK_PDIV
)
1777 } else if (c2
&& (op
== '+' || op
== '-') &&
1778 (((vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
))
1779 || (vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
)) == VT_LOCAL
)) {
1780 /* symbol + constant case */
1784 /* The backends can't always deal with addends to symbols
1785 larger than +-1<<31. Don't construct such. */
1792 if (!nocode_wanted
) {
1793 /* call low level op generator */
1794 if (t1
== VT_LLONG
|| t2
== VT_LLONG
||
1795 (PTR_SIZE
== 8 && (t1
== VT_PTR
|| t2
== VT_PTR
)))
1801 /* Ensure vtop isn't marked VT_CONST in case something
1802 up our callchain is interested in const-ness of the
1803 expression. Also make it a non-LVAL if it was,
1804 so that further code can't accidentally generate
1805 a deref (happen only for buggy uses of e.g.
1806 gv() under nocode_wanted). */
1807 vtop
->r
&= ~(VT_VALMASK
| VT_LVAL
);
1813 /* generate a floating point operation with constant propagation */
1814 static void gen_opif(int op
)
1822 /* currently, we cannot do computations with forward symbols */
1823 c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1824 c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1826 if (v1
->type
.t
== VT_FLOAT
) {
1829 } else if (v1
->type
.t
== VT_DOUBLE
) {
1837 /* NOTE: we only do constant propagation if finite number (not
1838 NaN or infinity) (ANSI spec) */
1839 if (!ieee_finite(f1
) || !ieee_finite(f2
))
1843 case '+': f1
+= f2
; break;
1844 case '-': f1
-= f2
; break;
1845 case '*': f1
*= f2
; break;
1849 tcc_error("division by zero in constant");
1854 /* XXX: also handles tests ? */
1858 /* XXX: overflow test ? */
1859 if (v1
->type
.t
== VT_FLOAT
) {
1861 } else if (v1
->type
.t
== VT_DOUBLE
) {
1869 if (!nocode_wanted
) {
1877 static int pointed_size(CType
*type
)
1880 return type_size(pointed_type(type
), &align
);
1883 static void vla_runtime_pointed_size(CType
*type
)
1886 vla_runtime_type_size(pointed_type(type
), &align
);
1889 static inline int is_null_pointer(SValue
*p
)
1891 if ((p
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
1893 return ((p
->type
.t
& VT_BTYPE
) == VT_INT
&& (uint32_t)p
->c
.i
== 0) ||
1894 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& p
->c
.i
== 0) ||
1895 ((p
->type
.t
& VT_BTYPE
) == VT_PTR
&&
1896 (PTR_SIZE
== 4 ? (uint32_t)p
->c
.i
== 0 : p
->c
.i
== 0));
1899 static inline int is_integer_btype(int bt
)
1901 return (bt
== VT_BYTE
|| bt
== VT_SHORT
||
1902 bt
== VT_INT
|| bt
== VT_LLONG
);
1905 /* check types for comparison or subtraction of pointers */
1906 static void check_comparison_pointer_types(SValue
*p1
, SValue
*p2
, int op
)
1908 CType
*type1
, *type2
, tmp_type1
, tmp_type2
;
1911 /* null pointers are accepted for all comparisons as gcc */
1912 if (is_null_pointer(p1
) || is_null_pointer(p2
))
1916 bt1
= type1
->t
& VT_BTYPE
;
1917 bt2
= type2
->t
& VT_BTYPE
;
1918 /* accept comparison between pointer and integer with a warning */
1919 if ((is_integer_btype(bt1
) || is_integer_btype(bt2
)) && op
!= '-') {
1920 if (op
!= TOK_LOR
&& op
!= TOK_LAND
)
1921 tcc_warning("comparison between pointer and integer");
1925 /* both must be pointers or implicit function pointers */
1926 if (bt1
== VT_PTR
) {
1927 type1
= pointed_type(type1
);
1928 } else if (bt1
!= VT_FUNC
)
1929 goto invalid_operands
;
1931 if (bt2
== VT_PTR
) {
1932 type2
= pointed_type(type2
);
1933 } else if (bt2
!= VT_FUNC
) {
1935 tcc_error("invalid operands to binary %s", get_tok_str(op
, NULL
));
1937 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
1938 (type2
->t
& VT_BTYPE
) == VT_VOID
)
1942 tmp_type1
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1943 tmp_type2
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1944 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
1945 /* gcc-like error if '-' is used */
1947 goto invalid_operands
;
1949 tcc_warning("comparison of distinct pointer types lacks a cast");
1953 /* generic gen_op: handles types problems */
1954 ST_FUNC
void gen_op(int op
)
1956 int u
, t1
, t2
, bt1
, bt2
, t
;
1960 t1
= vtop
[-1].type
.t
;
1961 t2
= vtop
[0].type
.t
;
1962 bt1
= t1
& VT_BTYPE
;
1963 bt2
= t2
& VT_BTYPE
;
1965 if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
1966 tcc_error("operation on a struct");
1967 } else if (bt1
== VT_FUNC
|| bt2
== VT_FUNC
) {
1968 if (bt2
== VT_FUNC
) {
1969 mk_pointer(&vtop
->type
);
1972 if (bt1
== VT_FUNC
) {
1974 mk_pointer(&vtop
->type
);
1979 } else if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
1980 /* at least one operand is a pointer */
1981 /* relationnal op: must be both pointers */
1982 if (op
>= TOK_ULT
&& op
<= TOK_LOR
) {
1983 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1984 /* pointers are handled are unsigned */
1985 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1986 t
= VT_LLONG
| VT_UNSIGNED
;
1988 t
= VT_INT
| VT_UNSIGNED
;
1992 /* if both pointers, then it must be the '-' op */
1993 if (bt1
== VT_PTR
&& bt2
== VT_PTR
) {
1995 tcc_error("cannot use pointers here");
1996 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1997 /* XXX: check that types are compatible */
1998 if (vtop
[-1].type
.t
& VT_VLA
) {
1999 vla_runtime_pointed_size(&vtop
[-1].type
);
2001 vpushi(pointed_size(&vtop
[-1].type
));
2005 /* set to integer type */
2006 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2007 vtop
->type
.t
= VT_LLONG
;
2009 vtop
->type
.t
= VT_INT
;
2014 /* exactly one pointer : must be '+' or '-'. */
2015 if (op
!= '-' && op
!= '+')
2016 tcc_error("cannot use pointers here");
2017 /* Put pointer as first operand */
2018 if (bt2
== VT_PTR
) {
2023 if ((vtop
[0].type
.t
& VT_BTYPE
) == VT_LLONG
)
2024 /* XXX: truncate here because gen_opl can't handle ptr + long long */
2025 gen_cast(&int_type
);
2027 type1
= vtop
[-1].type
;
2028 type1
.t
&= ~VT_ARRAY
;
2029 if (vtop
[-1].type
.t
& VT_VLA
)
2030 vla_runtime_pointed_size(&vtop
[-1].type
);
2032 u
= pointed_size(&vtop
[-1].type
);
2034 tcc_error("unknown array element size");
2035 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2038 /* XXX: cast to int ? (long long case) */
2044 /* #ifdef CONFIG_TCC_BCHECK
2045 The main reason to removing this code:
2052 fprintf(stderr, "v+i-j = %p\n", v+i-j);
2053 fprintf(stderr, "v+(i-j) = %p\n", v+(i-j));
2055 When this code is on. then the output looks like
2057 v+(i-j) = 0xbff84000
2059 /* if evaluating constant expression, no code should be
2060 generated, so no bound check */
2061 if (tcc_state
->do_bounds_check
&& !const_wanted
) {
2062 /* if bounded pointers, we generate a special code to
2069 gen_bounded_ptr_add();
2075 /* put again type if gen_opic() swaped operands */
2078 } else if (is_float(bt1
) || is_float(bt2
)) {
2079 /* compute bigger type and do implicit casts */
2080 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
2082 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
2087 /* floats can only be used for a few operations */
2088 if (op
!= '+' && op
!= '-' && op
!= '*' && op
!= '/' &&
2089 (op
< TOK_ULT
|| op
> TOK_GT
))
2090 tcc_error("invalid operands for binary operation");
2092 } else if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
) {
2093 t
= bt1
== VT_LLONG
? VT_LLONG
: VT_INT
;
2094 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (t
| VT_UNSIGNED
))
2097 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
2098 /* cast to biggest op */
2100 /* convert to unsigned if it does not fit in a long long */
2101 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
2102 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
2106 /* integer operations */
2108 /* convert to unsigned if it does not fit in an integer */
2109 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
2110 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
2113 /* XXX: currently, some unsigned operations are explicit, so
2114 we modify them here */
2115 if (t
& VT_UNSIGNED
) {
2122 else if (op
== TOK_LT
)
2124 else if (op
== TOK_GT
)
2126 else if (op
== TOK_LE
)
2128 else if (op
== TOK_GE
)
2135 /* special case for shifts and long long: we keep the shift as
2137 if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
)
2144 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
2145 /* relationnal op: the result is an int */
2146 vtop
->type
.t
= VT_INT
;
2151 // Make sure that we have converted to an rvalue:
2152 if (vtop
->r
& VT_LVAL
&& !nocode_wanted
)
2153 gv(is_float(vtop
->type
.t
& VT_BTYPE
) ? RC_FLOAT
: RC_INT
);
2156 #ifndef TCC_TARGET_ARM
2157 /* generic itof for unsigned long long case */
2158 static void gen_cvt_itof1(int t
)
2160 #ifdef TCC_TARGET_ARM64
2163 if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
2164 (VT_LLONG
| VT_UNSIGNED
)) {
2167 vpush_global_sym(&func_old_type
, TOK___floatundisf
);
2168 #if LDOUBLE_SIZE != 8
2169 else if (t
== VT_LDOUBLE
)
2170 vpush_global_sym(&func_old_type
, TOK___floatundixf
);
2173 vpush_global_sym(&func_old_type
, TOK___floatundidf
);
2177 vtop
->r
= reg_fret(t
);
2185 /* generic ftoi for unsigned long long case */
2186 static void gen_cvt_ftoi1(int t
)
2188 #ifdef TCC_TARGET_ARM64
2193 if (t
== (VT_LLONG
| VT_UNSIGNED
)) {
2194 /* not handled natively */
2195 st
= vtop
->type
.t
& VT_BTYPE
;
2197 vpush_global_sym(&func_old_type
, TOK___fixunssfdi
);
2198 #if LDOUBLE_SIZE != 8
2199 else if (st
== VT_LDOUBLE
)
2200 vpush_global_sym(&func_old_type
, TOK___fixunsxfdi
);
2203 vpush_global_sym(&func_old_type
, TOK___fixunsdfdi
);
2208 vtop
->r2
= REG_LRET
;
2215 /* force char or short cast */
2216 static void force_charshort_cast(int t
)
2220 /* XXX: add optimization if lvalue : just change type and offset */
2225 if (t
& VT_UNSIGNED
) {
2226 vpushi((1 << bits
) - 1);
2229 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
)
2235 /* result must be signed or the SAR is converted to an SHL
2236 This was not the case when "t" was a signed short
2237 and the last value on the stack was an unsigned int */
2238 vtop
->type
.t
&= ~VT_UNSIGNED
;
2244 /* cast 'vtop' to 'type'. Casting to bitfields is forbidden. */
2245 static void gen_cast(CType
*type
)
2247 int sbt
, dbt
, sf
, df
, c
, p
;
2249 /* special delayed cast for char/short */
2250 /* XXX: in some cases (multiple cascaded casts), it may still
2252 if (vtop
->r
& VT_MUSTCAST
) {
2253 vtop
->r
&= ~VT_MUSTCAST
;
2254 force_charshort_cast(vtop
->type
.t
);
2257 /* bitfields first get cast to ints */
2258 if (vtop
->type
.t
& VT_BITFIELD
&& !nocode_wanted
) {
2262 dbt
= type
->t
& (VT_BTYPE
| VT_UNSIGNED
);
2263 sbt
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
2268 c
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
2269 p
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
);
2271 /* constant case: we can do it now */
2272 /* XXX: in ISOC, cannot do it if error in convert */
2273 if (sbt
== VT_FLOAT
)
2274 vtop
->c
.ld
= vtop
->c
.f
;
2275 else if (sbt
== VT_DOUBLE
)
2276 vtop
->c
.ld
= vtop
->c
.d
;
2279 if ((sbt
& VT_BTYPE
) == VT_LLONG
) {
2280 if ((sbt
& VT_UNSIGNED
) || !(vtop
->c
.i
>> 63))
2281 vtop
->c
.ld
= vtop
->c
.i
;
2283 vtop
->c
.ld
= -(long double)-vtop
->c
.i
;
2285 if ((sbt
& VT_UNSIGNED
) || !(vtop
->c
.i
>> 31))
2286 vtop
->c
.ld
= (uint32_t)vtop
->c
.i
;
2288 vtop
->c
.ld
= -(long double)-(uint32_t)vtop
->c
.i
;
2291 if (dbt
== VT_FLOAT
)
2292 vtop
->c
.f
= (float)vtop
->c
.ld
;
2293 else if (dbt
== VT_DOUBLE
)
2294 vtop
->c
.d
= (double)vtop
->c
.ld
;
2295 } else if (sf
&& dbt
== (VT_LLONG
|VT_UNSIGNED
)) {
2296 vtop
->c
.i
= vtop
->c
.ld
;
2297 } else if (sf
&& dbt
== VT_BOOL
) {
2298 vtop
->c
.i
= (vtop
->c
.ld
!= 0);
2301 vtop
->c
.i
= vtop
->c
.ld
;
2302 else if (sbt
== (VT_LLONG
|VT_UNSIGNED
))
2304 else if (sbt
& VT_UNSIGNED
)
2305 vtop
->c
.i
= (uint32_t)vtop
->c
.i
;
2306 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2307 else if (sbt
== VT_PTR
)
2310 else if (sbt
!= VT_LLONG
)
2311 vtop
->c
.i
= ((uint32_t)vtop
->c
.i
|
2312 -(vtop
->c
.i
& 0x80000000));
2314 if (dbt
== (VT_LLONG
|VT_UNSIGNED
))
2316 else if (dbt
== VT_BOOL
)
2317 vtop
->c
.i
= (vtop
->c
.i
!= 0);
2318 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2319 else if (dbt
== VT_PTR
)
2322 else if (dbt
!= VT_LLONG
) {
2323 uint32_t m
= ((dbt
& VT_BTYPE
) == VT_BYTE
? 0xff :
2324 (dbt
& VT_BTYPE
) == VT_SHORT
? 0xffff :
2327 if (!(dbt
& VT_UNSIGNED
))
2328 vtop
->c
.i
|= -(vtop
->c
.i
& ((m
>> 1) + 1));
2331 } else if (p
&& dbt
== VT_BOOL
) {
2334 } else if (!nocode_wanted
) {
2335 /* non constant case: generate code */
2337 /* convert from fp to fp */
2340 /* convert int to fp */
2343 /* convert fp to int */
2344 if (dbt
== VT_BOOL
) {
2348 /* we handle char/short/etc... with generic code */
2349 if (dbt
!= (VT_INT
| VT_UNSIGNED
) &&
2350 dbt
!= (VT_LLONG
| VT_UNSIGNED
) &&
2354 if (dbt
== VT_INT
&& (type
->t
& (VT_BTYPE
| VT_UNSIGNED
)) != dbt
) {
2355 /* additional cast for char/short... */
2360 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
2361 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
) {
2362 if ((sbt
& VT_BTYPE
) != VT_LLONG
) {
2363 /* scalar to long long */
2364 /* machine independent conversion */
2366 /* generate high word */
2367 if (sbt
== (VT_INT
| VT_UNSIGNED
)) {
2371 if (sbt
== VT_PTR
) {
2372 /* cast from pointer to int before we apply
2373 shift operation, which pointers don't support*/
2374 gen_cast(&int_type
);
2380 /* patch second register */
2381 vtop
[-1].r2
= vtop
->r
;
2385 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
||
2386 (dbt
& VT_BTYPE
) == VT_PTR
||
2387 (dbt
& VT_BTYPE
) == VT_FUNC
) {
2388 if ((sbt
& VT_BTYPE
) != VT_LLONG
&&
2389 (sbt
& VT_BTYPE
) != VT_PTR
&&
2390 (sbt
& VT_BTYPE
) != VT_FUNC
) {
2391 /* need to convert from 32bit to 64bit */
2393 if (sbt
!= (VT_INT
| VT_UNSIGNED
)) {
2394 #if defined(TCC_TARGET_ARM64)
2396 #elif defined(TCC_TARGET_X86_64)
2398 /* x86_64 specific: movslq */
2400 o(0xc0 + (REG_VALUE(r
) << 3) + REG_VALUE(r
));
2407 } else if (dbt
== VT_BOOL
) {
2408 /* scalar to bool */
2411 } else if ((dbt
& VT_BTYPE
) == VT_BYTE
||
2412 (dbt
& VT_BTYPE
) == VT_SHORT
) {
2413 if (sbt
== VT_PTR
) {
2414 vtop
->type
.t
= VT_INT
;
2415 tcc_warning("nonportable conversion from pointer to char/short");
2417 force_charshort_cast(dbt
);
2418 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
2419 } else if ((dbt
& VT_BTYPE
) == VT_INT
) {
2421 if ((sbt
& VT_BTYPE
) == VT_LLONG
) {
2422 /* from long long: just take low order word */
2426 /* if lvalue and single word type, nothing to do because
2427 the lvalue already contains the real type size (see
2428 VT_LVAL_xxx constants) */
2432 } else if ((dbt
& VT_BTYPE
) == VT_PTR
&& !(vtop
->r
& VT_LVAL
)) {
2433 /* if we are casting between pointer types,
2434 we must update the VT_LVAL_xxx size */
2435 vtop
->r
= (vtop
->r
& ~VT_LVAL_TYPE
)
2436 | (lvalue_type(type
->ref
->type
.t
) & VT_LVAL_TYPE
);
2441 /* return type size as known at compile time. Put alignment at 'a' */
2442 ST_FUNC
int type_size(CType
*type
, int *a
)
2447 bt
= type
->t
& VT_BTYPE
;
2448 if (bt
== VT_STRUCT
) {
2453 } else if (bt
== VT_PTR
) {
2454 if (type
->t
& VT_ARRAY
) {
2458 ts
= type_size(&s
->type
, a
);
2460 if (ts
< 0 && s
->c
< 0)
2468 } else if (bt
== VT_LDOUBLE
) {
2470 return LDOUBLE_SIZE
;
2471 } else if (bt
== VT_DOUBLE
|| bt
== VT_LLONG
) {
2472 #ifdef TCC_TARGET_I386
2473 #ifdef TCC_TARGET_PE
2478 #elif defined(TCC_TARGET_ARM)
2488 } else if (bt
== VT_INT
|| bt
== VT_FLOAT
) {
2491 } else if (bt
== VT_SHORT
) {
2494 } else if (bt
== VT_QLONG
|| bt
== VT_QFLOAT
) {
2497 } else if (bt
== VT_ENUM
) {
2499 /* Enums might be incomplete, so don't just return '4' here. */
2500 return type
->ref
->c
;
2502 /* char, void, function, _Bool */
2508 /* push type size as known at runtime time on top of value stack. Put
2510 ST_FUNC
void vla_runtime_type_size(CType
*type
, int *a
)
2512 if (type
->t
& VT_VLA
) {
2513 type_size(&type
->ref
->type
, a
);
2514 vset(&int_type
, VT_LOCAL
|VT_LVAL
, type
->ref
->c
);
2516 vpushi(type_size(type
, a
));
2520 static void vla_sp_restore(void) {
2521 if (vlas_in_scope
) {
2522 gen_vla_sp_restore(vla_sp_loc
);
2526 static void vla_sp_restore_root(void) {
2527 if (vlas_in_scope
) {
2528 gen_vla_sp_restore(vla_sp_root_loc
);
2532 /* return the pointed type of t */
2533 static inline CType
*pointed_type(CType
*type
)
2535 return &type
->ref
->type
;
2538 /* modify type so that its it is a pointer to type. */
2539 ST_FUNC
void mk_pointer(CType
*type
)
2542 s
= sym_push(SYM_FIELD
, type
, 0, -1);
2543 type
->t
= VT_PTR
| (type
->t
& ~VT_TYPE
);
2547 /* compare function types. OLD functions match any new functions */
2548 static int is_compatible_func(CType
*type1
, CType
*type2
)
2554 if (!is_compatible_types(&s1
->type
, &s2
->type
))
2556 /* check func_call */
2557 if (s1
->a
.func_call
!= s2
->a
.func_call
)
2559 /* XXX: not complete */
2560 if (s1
->c
== FUNC_OLD
|| s2
->c
== FUNC_OLD
)
2564 while (s1
!= NULL
) {
2567 if (!is_compatible_parameter_types(&s1
->type
, &s2
->type
))
2577 /* return true if type1 and type2 are the same. If unqualified is
2578 true, qualifiers on the types are ignored.
2580 - enums are not checked as gcc __builtin_types_compatible_p ()
2582 static int compare_types(CType
*type1
, CType
*type2
, int unqualified
)
2586 t1
= type1
->t
& VT_TYPE
;
2587 t2
= type2
->t
& VT_TYPE
;
2589 /* strip qualifiers before comparing */
2590 t1
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2591 t2
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2593 /* Default Vs explicit signedness only matters for char */
2594 if ((t1
& VT_BTYPE
) != VT_BYTE
) {
2598 /* An enum is compatible with (unsigned) int. Ideally we would
2599 store the enums signedness in type->ref.a.<some_bit> and
2600 only accept unsigned enums with unsigned int and vice versa.
2601 But one of our callers (gen_assign_cast) always strips VT_UNSIGNED
2602 from pointer target types, so we can't add it here either. */
2603 if ((t1
& VT_BTYPE
) == VT_ENUM
) {
2605 if (type1
->ref
->a
.unsigned_enum
)
2608 if ((t2
& VT_BTYPE
) == VT_ENUM
) {
2610 if (type2
->ref
->a
.unsigned_enum
)
2613 /* XXX: bitfields ? */
2616 /* test more complicated cases */
2617 bt1
= t1
& VT_BTYPE
;
2618 if (bt1
== VT_PTR
) {
2619 type1
= pointed_type(type1
);
2620 type2
= pointed_type(type2
);
2621 return is_compatible_types(type1
, type2
);
2622 } else if (bt1
== VT_STRUCT
) {
2623 return (type1
->ref
== type2
->ref
);
2624 } else if (bt1
== VT_FUNC
) {
2625 return is_compatible_func(type1
, type2
);
2631 /* return true if type1 and type2 are exactly the same (including
2634 static int is_compatible_types(CType
*type1
, CType
*type2
)
2636 return compare_types(type1
,type2
,0);
2639 /* return true if type1 and type2 are the same (ignoring qualifiers).
2641 static int is_compatible_parameter_types(CType
*type1
, CType
*type2
)
2643 return compare_types(type1
,type2
,1);
2646 /* print a type. If 'varstr' is not NULL, then the variable is also
2647 printed in the type */
2649 /* XXX: add array and function pointers */
2650 static void type_to_str(char *buf
, int buf_size
,
2651 CType
*type
, const char *varstr
)
2658 t
= type
->t
& VT_TYPE
;
2661 if (t
& VT_CONSTANT
)
2662 pstrcat(buf
, buf_size
, "const ");
2663 if (t
& VT_VOLATILE
)
2664 pstrcat(buf
, buf_size
, "volatile ");
2665 if ((t
& (VT_DEFSIGN
| VT_UNSIGNED
)) == (VT_DEFSIGN
| VT_UNSIGNED
))
2666 pstrcat(buf
, buf_size
, "unsigned ");
2667 else if (t
& VT_DEFSIGN
)
2668 pstrcat(buf
, buf_size
, "signed ");
2698 tstr
= "long double";
2700 pstrcat(buf
, buf_size
, tstr
);
2704 if (bt
== VT_STRUCT
)
2708 pstrcat(buf
, buf_size
, tstr
);
2709 v
= type
->ref
->v
& ~SYM_STRUCT
;
2710 if (v
>= SYM_FIRST_ANOM
)
2711 pstrcat(buf
, buf_size
, "<anonymous>");
2713 pstrcat(buf
, buf_size
, get_tok_str(v
, NULL
));
2717 type_to_str(buf
, buf_size
, &s
->type
, varstr
);
2718 pstrcat(buf
, buf_size
, "(");
2720 while (sa
!= NULL
) {
2721 type_to_str(buf1
, sizeof(buf1
), &sa
->type
, NULL
);
2722 pstrcat(buf
, buf_size
, buf1
);
2725 pstrcat(buf
, buf_size
, ", ");
2727 pstrcat(buf
, buf_size
, ")");
2732 snprintf(buf1
, sizeof(buf1
), "%s[%ld]", varstr
? varstr
: "", s
->c
);
2733 type_to_str(buf
, buf_size
, &s
->type
, buf1
);
2736 pstrcpy(buf1
, sizeof(buf1
), "*");
2737 if (t
& VT_CONSTANT
)
2738 pstrcat(buf1
, buf_size
, "const ");
2739 if (t
& VT_VOLATILE
)
2740 pstrcat(buf1
, buf_size
, "volatile ");
2742 pstrcat(buf1
, sizeof(buf1
), varstr
);
2743 type_to_str(buf
, buf_size
, &s
->type
, buf1
);
2747 pstrcat(buf
, buf_size
, " ");
2748 pstrcat(buf
, buf_size
, varstr
);
2753 /* verify type compatibility to store vtop in 'dt' type, and generate
2755 static void gen_assign_cast(CType
*dt
)
2757 CType
*st
, *type1
, *type2
, tmp_type1
, tmp_type2
;
2758 char buf1
[256], buf2
[256];
2761 st
= &vtop
->type
; /* source type */
2762 dbt
= dt
->t
& VT_BTYPE
;
2763 sbt
= st
->t
& VT_BTYPE
;
2764 if (sbt
== VT_VOID
|| dbt
== VT_VOID
) {
2765 if (sbt
== VT_VOID
&& dbt
== VT_VOID
)
2767 It is Ok if both are void
2773 gcc accepts this program
2776 tcc_error("cannot cast from/to void");
2778 if (dt
->t
& VT_CONSTANT
)
2779 tcc_warning("assignment of read-only location");
2782 /* special cases for pointers */
2783 /* '0' can also be a pointer */
2784 if (is_null_pointer(vtop
))
2786 /* accept implicit pointer to integer cast with warning */
2787 if (is_integer_btype(sbt
)) {
2788 tcc_warning("assignment makes pointer from integer without a cast");
2791 type1
= pointed_type(dt
);
2792 /* a function is implicitely a function pointer */
2793 if (sbt
== VT_FUNC
) {
2794 if ((type1
->t
& VT_BTYPE
) != VT_VOID
&&
2795 !is_compatible_types(pointed_type(dt
), st
))
2796 tcc_warning("assignment from incompatible pointer type");
2801 type2
= pointed_type(st
);
2802 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
2803 (type2
->t
& VT_BTYPE
) == VT_VOID
) {
2804 /* void * can match anything */
2806 /* exact type match, except for qualifiers */
2809 tmp_type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2810 tmp_type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2811 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
2812 /* Like GCC don't warn by default for merely changes
2813 in pointer target signedness. Do warn for different
2814 base types, though, in particular for unsigned enums
2815 and signed int targets. */
2816 if ((tmp_type1
.t
& (VT_DEFSIGN
| VT_UNSIGNED
)) !=
2817 (tmp_type2
.t
& (VT_DEFSIGN
| VT_UNSIGNED
)) &&
2818 (tmp_type1
.t
& VT_BTYPE
) == (tmp_type2
.t
& VT_BTYPE
))
2821 tcc_warning("assignment from incompatible pointer type");
2824 /* check const and volatile */
2825 if ((!(type1
->t
& VT_CONSTANT
) && (type2
->t
& VT_CONSTANT
)) ||
2826 (!(type1
->t
& VT_VOLATILE
) && (type2
->t
& VT_VOLATILE
)))
2827 tcc_warning("assignment discards qualifiers from pointer target type");
2833 if (sbt
== VT_PTR
|| sbt
== VT_FUNC
) {
2834 tcc_warning("assignment makes integer from pointer without a cast");
2835 } else if (sbt
== VT_STRUCT
) {
2836 goto case_VT_STRUCT
;
2838 /* XXX: more tests */
2844 tmp_type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2845 tmp_type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2846 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
2848 type_to_str(buf1
, sizeof(buf1
), st
, NULL
);
2849 type_to_str(buf2
, sizeof(buf2
), dt
, NULL
);
2850 tcc_error("cannot cast '%s' to '%s'", buf1
, buf2
);
2858 /* store vtop in lvalue pushed on stack */
2859 ST_FUNC
void vstore(void)
2861 int sbt
, dbt
, ft
, r
, t
, size
, align
, bit_size
, bit_pos
, rc
, delayed_cast
;
2863 ft
= vtop
[-1].type
.t
;
2864 sbt
= vtop
->type
.t
& VT_BTYPE
;
2865 dbt
= ft
& VT_BTYPE
;
2866 if ((((sbt
== VT_INT
|| sbt
== VT_SHORT
) && dbt
== VT_BYTE
) ||
2867 (sbt
== VT_INT
&& dbt
== VT_SHORT
))
2868 && !(vtop
->type
.t
& VT_BITFIELD
)) {
2869 /* optimize char/short casts */
2870 delayed_cast
= VT_MUSTCAST
;
2871 vtop
->type
.t
= (ft
& VT_TYPE
& ~VT_BITFIELD
&
2872 ((1 << VT_STRUCT_SHIFT
) - 1));
2873 /* XXX: factorize */
2874 if (ft
& VT_CONSTANT
)
2875 tcc_warning("assignment of read-only location");
2878 if (!(ft
& VT_BITFIELD
))
2879 gen_assign_cast(&vtop
[-1].type
);
2882 if (sbt
== VT_STRUCT
) {
2883 /* if structure, only generate pointer */
2884 /* structure assignment : generate memcpy */
2885 /* XXX: optimize if small size */
2886 if (!nocode_wanted
) {
2887 size
= type_size(&vtop
->type
, &align
);
2891 vtop
->type
.t
= VT_PTR
;
2894 /* address of memcpy() */
2897 vpush_global_sym(&func_old_type
, TOK_memcpy8
);
2898 else if(!(align
& 3))
2899 vpush_global_sym(&func_old_type
, TOK_memcpy4
);
2902 /* Use memmove, rather than memcpy, as dest and src may be same: */
2903 vpush_global_sym(&func_old_type
, TOK_memmove
);
2908 vtop
->type
.t
= VT_PTR
;
2917 /* leave source on stack */
2918 } else if (ft
& VT_BITFIELD
) {
2919 /* bitfield store handling */
2921 /* save lvalue as expression result (example: s.b = s.a = n;) */
2922 vdup(), vtop
[-1] = vtop
[-2];
2924 bit_pos
= (ft
>> VT_STRUCT_SHIFT
) & 0x3f;
2925 bit_size
= (ft
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
2926 /* remove bit field info to avoid loops */
2927 vtop
[-1].type
.t
= ft
& ~VT_BITFIELD
& ((1 << VT_STRUCT_SHIFT
) - 1);
2929 if((ft
& VT_BTYPE
) == VT_BOOL
) {
2930 gen_cast(&vtop
[-1].type
);
2931 vtop
[-1].type
.t
= (vtop
[-1].type
.t
& ~VT_BTYPE
) | (VT_BYTE
| VT_UNSIGNED
);
2934 /* duplicate destination */
2936 vtop
[-1] = vtop
[-2];
2938 /* mask and shift source */
2939 if((ft
& VT_BTYPE
) != VT_BOOL
) {
2940 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2941 vpushll((1ULL << bit_size
) - 1ULL);
2943 vpushi((1 << bit_size
) - 1);
2949 /* load destination, mask and or with source */
2951 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2952 vpushll(~(((1ULL << bit_size
) - 1ULL) << bit_pos
));
2954 vpushi(~(((1 << bit_size
) - 1) << bit_pos
));
2960 /* ... and discard */
2964 if (!nocode_wanted
) {
2965 #ifdef CONFIG_TCC_BCHECK
2966 /* bound check case */
2967 if (vtop
[-1].r
& VT_MUSTBOUND
) {
2976 #ifdef TCC_TARGET_X86_64
2977 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
2979 } else if ((ft
& VT_BTYPE
) == VT_QFLOAT
) {
2984 r
= gv(rc
); /* generate value */
2985 /* if lvalue was saved on stack, must read it */
2986 if ((vtop
[-1].r
& VT_VALMASK
) == VT_LLOCAL
) {
2988 t
= get_reg(RC_INT
);
2989 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2994 sv
.r
= VT_LOCAL
| VT_LVAL
;
2995 sv
.c
.i
= vtop
[-1].c
.i
;
2997 vtop
[-1].r
= t
| VT_LVAL
;
2999 /* two word case handling : store second register at word + 4 (or +8 for x86-64) */
3000 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
3001 if (((ft
& VT_BTYPE
) == VT_QLONG
) || ((ft
& VT_BTYPE
) == VT_QFLOAT
)) {
3002 int addr_type
= VT_LLONG
, load_size
= 8, load_type
= ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) ? VT_LLONG
: VT_DOUBLE
;
3004 if ((ft
& VT_BTYPE
) == VT_LLONG
) {
3005 int addr_type
= VT_INT
, load_size
= 4, load_type
= VT_INT
;
3007 vtop
[-1].type
.t
= load_type
;
3010 /* convert to int to increment easily */
3011 vtop
->type
.t
= addr_type
;
3017 vtop
[-1].type
.t
= load_type
;
3018 /* XXX: it works because r2 is spilled last ! */
3019 store(vtop
->r2
, vtop
- 1);
3025 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
3026 vtop
->r
|= delayed_cast
;
3030 /* post defines POST/PRE add. c is the token ++ or -- */
3031 ST_FUNC
void inc(int post
, int c
)
3034 vdup(); /* save lvalue */
3037 gv_dup(); /* duplicate value */
3039 vdup(); /* duplicate value */
3044 vpushi(c
- TOK_MID
);
3046 vstore(); /* store value */
3048 vpop(); /* if post op, return saved value */
3051 ST_FUNC
void parse_mult_str (CString
*astr
, const char *msg
)
3053 /* read the string */
3057 while (tok
== TOK_STR
) {
3058 /* XXX: add \0 handling too ? */
3059 cstr_cat(astr
, tokc
.str
.data
, -1);
3062 cstr_ccat(astr
, '\0');
3065 /* Parse GNUC __attribute__ extension. Currently, the following
3066 extensions are recognized:
3067 - aligned(n) : set data/function alignment.
3068 - packed : force data alignment to 1
3069 - section(x) : generate data/code in this section.
3070 - unused : currently ignored, but may be used someday.
3071 - regparm(n) : pass function parameters in registers (i386 only)
3073 static void parse_attribute(AttributeDef
*ad
)
3078 while (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
) {
3082 while (tok
!= ')') {
3083 if (tok
< TOK_IDENT
)
3084 expect("attribute name");
3091 parse_mult_str(&astr
, "section name");
3092 ad
->section
= find_section(tcc_state
, (char *)astr
.data
);
3099 parse_mult_str(&astr
, "alias(\"target\")");
3100 ad
->alias_target
= /* save string as token, for later */
3101 tok_alloc((char*)astr
.data
, astr
.size
-1)->tok
;
3105 case TOK_VISIBILITY1
:
3106 case TOK_VISIBILITY2
:
3108 parse_mult_str(&astr
,
3109 "visibility(\"default|hidden|internal|protected\")");
3110 if (!strcmp (astr
.data
, "default"))
3111 ad
->a
.visibility
= STV_DEFAULT
;
3112 else if (!strcmp (astr
.data
, "hidden"))
3113 ad
->a
.visibility
= STV_HIDDEN
;
3114 else if (!strcmp (astr
.data
, "internal"))
3115 ad
->a
.visibility
= STV_INTERNAL
;
3116 else if (!strcmp (astr
.data
, "protected"))
3117 ad
->a
.visibility
= STV_PROTECTED
;
3119 expect("visibility(\"default|hidden|internal|protected\")");
3128 if (n
<= 0 || (n
& (n
- 1)) != 0)
3129 tcc_error("alignment must be a positive power of two");
3146 /* currently, no need to handle it because tcc does not
3147 track unused objects */
3151 /* currently, no need to handle it because tcc does not
3152 track unused objects */
3157 ad
->a
.func_call
= FUNC_CDECL
;
3162 ad
->a
.func_call
= FUNC_STDCALL
;
3164 #ifdef TCC_TARGET_I386
3174 ad
->a
.func_call
= FUNC_FASTCALL1
+ n
- 1;
3180 ad
->a
.func_call
= FUNC_FASTCALLW
;
3187 ad
->a
.mode
= VT_LLONG
+ 1;
3190 ad
->a
.mode
= VT_BYTE
+ 1;
3193 ad
->a
.mode
= VT_SHORT
+ 1;
3197 ad
->a
.mode
= VT_INT
+ 1;
3200 tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok
, NULL
));
3207 ad
->a
.func_export
= 1;
3210 ad
->a
.func_import
= 1;
3213 if (tcc_state
->warn_unsupported
)
3214 tcc_warning("'%s' attribute ignored", get_tok_str(t
, NULL
));
3215 /* skip parameters */
3217 int parenthesis
= 0;
3221 else if (tok
== ')')
3224 } while (parenthesis
&& tok
!= -1);
3237 static Sym
* find_field (CType
*type
, int v
)
3241 while ((s
= s
->next
) != NULL
) {
3242 if ((s
->v
& SYM_FIELD
) &&
3243 (s
->type
.t
& VT_BTYPE
) == VT_STRUCT
&&
3244 (s
->v
& ~SYM_FIELD
) >= SYM_FIRST_ANOM
) {
3245 Sym
*ret
= find_field (&s
->type
, v
);
3255 static void struct_add_offset (Sym
*s
, int offset
)
3257 while ((s
= s
->next
) != NULL
) {
3258 if ((s
->v
& SYM_FIELD
) &&
3259 (s
->type
.t
& VT_BTYPE
) == VT_STRUCT
&&
3260 (s
->v
& ~SYM_FIELD
) >= SYM_FIRST_ANOM
) {
3261 struct_add_offset(s
->type
.ref
, offset
);
3267 static void struct_layout(CType
*type
, AttributeDef
*ad
)
3269 int align
, maxalign
, offset
, c
, bit_pos
, bt
, prevbt
;
3270 int pcc
= !tcc_state
->ms_bitfields
;
3273 maxalign
= ad
->a
.aligned
;
3279 prevbt
= VT_STRUCT
; /* make it never match */
3280 for (f
= type
->ref
->next
; f
; f
= f
->next
) {
3281 int extra_bytes
= 0;
3282 int typealign
, bit_size
;
3283 int size
= type_size(&f
->type
, &typealign
);
3284 if (f
->type
.t
& VT_BITFIELD
) {
3285 bit_size
= (f
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
3286 /* without ms-bitfields, allocate the
3287 * minimum number of bytes necessary,
3288 * adding single bytes as needed */
3289 if (0 && !tcc_state
->ms_bitfields
) {
3291 /* minimum bytes for new bitfield */
3292 size
= (bit_size
+ 7) / 8;
3294 /* enough spare bits already allocated? */
3295 int add_size
= (bit_pos
- 1) % 8 + 1 + bit_size
;
3296 if (add_size
> 8) /* doesn't fit */
3297 extra_bytes
= (add_size
- 1) / 8;
3302 if (bit_size
== 0 && pcc
) {
3303 /* Zero-width bit-fields in PCC mode aren't affected
3304 by any packing (attribute or pragma). */
3306 } else if (f
->r
> 1) {
3308 } else if (ad
->a
.packed
|| f
->r
== 1) {
3314 if (extra_bytes
) c
+= extra_bytes
;
3315 else if (bit_size
< 0) {
3317 if (type
->ref
->type
.t
== TOK_STRUCT
) {
3318 int addbytes
= pcc
? (bit_pos
+ 7) >> 3 : 0;
3319 c
= (c
+ addbytes
+ align
- 1) & -align
;
3329 if (align
> maxalign
)
3332 } else if (type
->ref
->type
.t
!= TOK_STRUCT
) {
3334 size
= (bit_size
+ 7) >> 3;
3335 f
->type
.t
= (f
->type
.t
& ~(0x3f << VT_STRUCT_SHIFT
))
3336 | (0 << VT_STRUCT_SHIFT
);
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). */
3343 /* In PCC layout a non-packed bit-field is placed adjacent
3344 to the preceding bit-fields, except if it would overflow
3345 its container (depending on base type) or it's a zero-width
3346 bit-field. Packed non-zero-width bit-fields always are
3348 int ofs
= (c
* 8 + bit_pos
) % (typealign
* 8);
3349 int ofs2
= ofs
+ bit_size
+ (typealign
* 8) - 1;
3350 /*if ((typealign != 1 &&
3351 //bit_pos + bit_size > size * 8) ||
3352 (((c + ((bit_pos + 7) >> 3) + typealign - 1) & -typealign)
3353 != ((c + ((bit_pos + bit_size + 7) >> 3) + typealign - 1) & -typealign))) ||
3355 (bit_pos + bit_size > size * 8)
3357 if (bit_size
== 0 ||
3358 (typealign
!= 1 && (ofs2
/ (typealign
* 8)) > ((size
*8)/(typealign
*8)))) {
3359 c
= (c
+ ((bit_pos
+ 7) >> 3) + typealign
- 1) & -typealign
;
3363 /* In PCC layout named bit-fields influence the alignment
3364 of the containing struct using the base types alignment,
3365 except for packed fields or zero-width fields. */
3366 if (!(f
->v
& SYM_FIRST_ANOM
)) {
3367 if (align
> maxalign
)
3369 if (typealign
> maxalign
)
3370 maxalign
= typealign
;
3373 bt
= f
->type
.t
& VT_BTYPE
;
3376 bit_pos
+ bit_size
> size
* 8) ||
3377 (bit_size
== 0 && prevbt
== bt
) ||
3378 (bit_size
> 0 && bt
!= prevbt
))) {
3379 c
= (c
+ typealign
- 1) & -typealign
;
3382 /* In MS bitfield mode a bit-field run always uses
3383 at least as many bits as the underlying type. */
3386 if (bit_size
> 0 || prevbt
== bt
) {
3387 if (align
> maxalign
)
3389 if (typealign
> maxalign
)
3390 maxalign
= typealign
;
3394 f
->type
.t
= (f
->type
.t
& ~(0x3f << VT_STRUCT_SHIFT
))
3395 | (bit_pos
<< VT_STRUCT_SHIFT
);
3396 bit_pos
+= bit_size
;
3397 if (pcc
&& bit_pos
>= size
* 8) {
3399 bit_pos
-= size
* 8;
3403 printf("set field %s offset=%d c=%d",
3404 get_tok_str(f
->v
& ~SYM_FIELD
, NULL
), offset
, c
);
3405 if (f
->type
.t
& VT_BITFIELD
) {
3406 printf(" pos=%d size=%d",
3407 (f
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f,
3408 (f
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f);
3413 if (f
->v
& SYM_FIRST_ANOM
&& (f
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
3415 /* An anonymous struct/union. Adjust member offsets
3416 to reflect the real offset of our containing struct.
3417 Also set the offset of this anon member inside
3418 the outer struct to be zero. Via this it
3419 works when accessing the field offset directly
3420 (from base object), as well as when recursing
3421 members in initializer handling. */
3422 int v2
= f
->type
.ref
->v
;
3423 if (!(v2
& SYM_FIELD
) &&
3424 (v2
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
3426 /* This happens only with MS extensions. The
3427 anon member has a named struct type, so it
3428 potentially is shared with other references.
3429 We need to unshare members so we can modify
3432 f
->type
.ref
= sym_push(anon_sym
++ | SYM_FIELD
,
3433 &f
->type
.ref
->type
, 0,
3435 pps
= &f
->type
.ref
->next
;
3436 while ((ass
= ass
->next
) != NULL
) {
3437 *pps
= sym_push(ass
->v
, &ass
->type
, 0, ass
->c
);
3438 pps
= &((*pps
)->next
);
3442 struct_add_offset(f
->type
.ref
, offset
);
3450 /* store size and alignment */
3451 type
->ref
->c
= (c
+ (pcc
? (bit_pos
+ 7) >> 3 : 0)
3452 + maxalign
- 1) & -maxalign
;
3453 type
->ref
->r
= maxalign
;
3456 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
3457 static void struct_decl(CType
*type
, AttributeDef
*ad
, int u
)
3460 int a
, v
, size
, align
, flexible
, alignoverride
;
3462 int bit_size
, bit_pos
, bsize
, bt
, prevbt
;
3467 a
= tok
; /* save decl type */
3469 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3470 parse_attribute(ad
);
3474 /* struct already defined ? return it */
3476 expect("struct/union/enum name");
3478 if (s
&& (s
->scope
== local_scope
|| (tok
!= '{' && tok
!= ';'))) {
3480 tcc_error("redefinition of '%s'", get_tok_str(v
, NULL
));
3486 /* Record the original enum/struct/union token. */
3489 /* we put an undefined size for struct/union */
3490 s
= sym_push(v
| SYM_STRUCT
, &type1
, 0, -1);
3491 s
->r
= 0; /* default alignment is zero as gcc */
3492 /* put struct/union/enum name in type */
3500 tcc_error("struct/union/enum already defined");
3501 /* cannot be empty */
3503 /* non empty enums are not allowed */
3504 if (a
== TOK_ENUM
) {
3508 CType
*t
= &int_type
;
3511 expect("identifier");
3513 if (ss
&& !local_stack
)
3514 tcc_error("redefinition of enumerator '%s'",
3515 get_tok_str(v
, NULL
));
3519 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
3522 /* We really want to support long long enums
3523 on i386 as well, but the Sym structure only
3524 holds a 'long' for associated constants,
3525 and enlarging it would bump its size (no
3526 available padding). So punt for now. */
3532 if (c
!= (int)c
&& (unsigned long)c
!= (unsigned int)c
)
3533 seen_wide
= 1, t
= &size_type
;
3534 /* enum symbols have static storage */
3535 ss
= sym_push(v
, t
, VT_CONST
, c
);
3536 ss
->type
.t
|= VT_STATIC
;
3541 /* NOTE: we accept a trailing comma */
3546 s
->a
.unsigned_enum
= 1;
3547 s
->c
= type_size(seen_wide
? &size_type
: &int_type
, &align
);
3554 while (tok
!= '}') {
3555 if (!parse_btype(&btype
, &ad1
)) {
3562 tcc_error("flexible array member '%s' not at the end of struct",
3563 get_tok_str(v
, NULL
));
3568 type_decl(&type1
, &ad1
, &v
, TYPE_DIRECT
| TYPE_ABSTRACT
);
3570 if ((type1
.t
& VT_BTYPE
) != VT_STRUCT
)
3571 expect("identifier");
3573 int v
= btype
.ref
->v
;
3574 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
3575 if (tcc_state
->ms_extensions
== 0)
3576 expect("identifier");
3580 if (type_size(&type1
, &align
) < 0) {
3581 if ((a
== TOK_STRUCT
) && (type1
.t
& VT_ARRAY
) && c
)
3584 tcc_error("field '%s' has incomplete type",
3585 get_tok_str(v
, NULL
));
3587 if ((type1
.t
& VT_BTYPE
) == VT_FUNC
||
3588 (type1
.t
& (VT_TYPEDEF
| VT_STATIC
| VT_EXTERN
| VT_INLINE
)))
3589 tcc_error("invalid type for '%s'",
3590 get_tok_str(v
, NULL
));
3594 bit_size
= expr_const();
3595 /* XXX: handle v = 0 case for messages */
3597 tcc_error("negative width in bit-field '%s'",
3598 get_tok_str(v
, NULL
));
3599 if (v
&& bit_size
== 0)
3600 tcc_error("zero width for bit-field '%s'",
3601 get_tok_str(v
, NULL
));
3602 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3603 parse_attribute(&ad1
);
3605 size
= type_size(&type1
, &align
);
3606 /* Only remember non-default alignment. */
3608 if (ad1
.a
.aligned
) {
3609 if (align
< ad1
.a
.aligned
)
3610 alignoverride
= ad1
.a
.aligned
;
3611 } else if (ad1
.a
.packed
|| ad
->a
.packed
) {
3613 } else if (*tcc_state
->pack_stack_ptr
) {
3614 if (align
> *tcc_state
->pack_stack_ptr
)
3615 alignoverride
= *tcc_state
->pack_stack_ptr
;
3617 if (bit_size
>= 0) {
3618 bt
= type1
.t
& VT_BTYPE
;
3625 tcc_error("bitfields must have scalar type");
3627 if (bit_size
> bsize
) {
3628 tcc_error("width of '%s' exceeds its type",
3629 get_tok_str(v
, NULL
));
3630 } else if (bit_size
== bsize
) {
3631 /* no need for bit fields */
3634 /* if type change, union, or will overrun
3635 * allignment slot, start at a newly
3637 if ((bit_pos
+ bit_size
) > bsize
||
3638 bt
!= prevbt
|| a
== TOK_UNION
)
3640 /* XXX: handle LSB first */
3641 type1
.t
|= VT_BITFIELD
|
3642 (bit_pos
<< VT_STRUCT_SHIFT
) |
3643 (bit_size
<< (VT_STRUCT_SHIFT
+ 6));
3644 bit_pos
+= bit_size
;
3650 if (v
!= 0 || (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
3651 /* Remember we've seen a real field to check
3652 for placement of flexible array member. */
3655 if (v
== 0 && (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
3656 /* See struct_layout for special casing
3657 anonymous member of struct type. */
3660 if (v
== 0 && bit_size
>= 0) {
3661 /* Need to remember anon bit-fields as well.
3662 They influence layout. */
3666 ss
= sym_push(v
| SYM_FIELD
, &type1
, alignoverride
, extra_bytes
);
3670 if (tok
== ';' || tok
== TOK_EOF
)
3677 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3678 parse_attribute(ad
);
3679 struct_layout(type
, ad
);
3684 /* return 1 if basic type is a type size (short, long, long long) */
3685 ST_FUNC
int is_btype_size(int bt
)
3687 return bt
== VT_SHORT
|| bt
== VT_LONG
|| bt
== VT_LLONG
;
3690 /* Add type qualifiers to a type. If the type is an array then the qualifiers
3691 are added to the element type, copied because it could be a typedef. */
3692 static void parse_btype_qualify(CType
*type
, int qualifiers
)
3694 while (type
->t
& VT_ARRAY
) {
3695 type
->ref
= sym_push(SYM_FIELD
, &type
->ref
->type
, 0, type
->ref
->c
);
3696 type
= &type
->ref
->type
;
3698 type
->t
|= qualifiers
;
3701 /* return 0 if no type declaration. otherwise, return the basic type
3704 static int parse_btype(CType
*type
, AttributeDef
*ad
)
3706 int t
, u
, bt_size
, complete
, type_found
, typespec_found
;
3710 memset(ad
, 0, sizeof(AttributeDef
));
3718 /* currently, we really ignore extension */
3729 tcc_error("too many basic types");
3731 bt_size
= is_btype_size (u
& VT_BTYPE
);
3732 if (u
== VT_INT
|| (!bt_size
&& !(t
& VT_TYPEDEF
)))
3747 if ((t
& VT_BTYPE
) == VT_DOUBLE
) {
3748 #ifndef TCC_TARGET_PE
3749 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3751 } else if ((t
& VT_BTYPE
) == VT_LONG
) {
3752 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3758 #ifdef TCC_TARGET_ARM64
3760 /* GCC's __uint128_t appears in some Linux header files. Make it a
3761 synonym for long double to get the size and alignment right. */
3773 if ((t
& VT_BTYPE
) == VT_LONG
) {
3774 #ifdef TCC_TARGET_PE
3775 t
= (t
& ~VT_BTYPE
) | VT_DOUBLE
;
3777 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3785 struct_decl(&type1
, ad
, VT_ENUM
);
3788 type
->ref
= type1
.ref
;
3792 struct_decl(&type1
, ad
, VT_STRUCT
);
3795 /* type modifiers */
3800 parse_btype_qualify(type
, VT_CONSTANT
);
3808 parse_btype_qualify(type
, VT_VOLATILE
);
3815 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == (VT_DEFSIGN
|VT_UNSIGNED
))
3816 tcc_error("signed and unsigned modifier");
3829 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == VT_DEFSIGN
)
3830 tcc_error("signed and unsigned modifier");
3831 t
|= VT_DEFSIGN
| VT_UNSIGNED
;
3856 /* GNUC attribute */
3857 case TOK_ATTRIBUTE1
:
3858 case TOK_ATTRIBUTE2
:
3859 parse_attribute(ad
);
3862 t
= (t
& ~VT_BTYPE
) | u
;
3870 parse_expr_type(&type1
);
3871 /* remove all storage modifiers except typedef */
3872 type1
.t
&= ~(VT_STORAGE
&~VT_TYPEDEF
);
3878 if (!s
|| !(s
->type
.t
& VT_TYPEDEF
))
3881 type
->t
= ((s
->type
.t
& ~VT_TYPEDEF
) |
3882 (t
& ~(VT_CONSTANT
| VT_VOLATILE
)));
3883 type
->ref
= s
->type
.ref
;
3884 if (t
& (VT_CONSTANT
| VT_VOLATILE
))
3885 parse_btype_qualify(type
, t
& (VT_CONSTANT
| VT_VOLATILE
));
3889 /* get attributes from typedef */
3890 if (0 == ad
->a
.aligned
)
3891 ad
->a
.aligned
= s
->a
.aligned
;
3892 if (0 == ad
->a
.func_call
)
3893 ad
->a
.func_call
= s
->a
.func_call
;
3894 ad
->a
.packed
|= s
->a
.packed
;
3903 if (tcc_state
->char_is_unsigned
) {
3904 if ((t
& (VT_DEFSIGN
|VT_BTYPE
)) == VT_BYTE
)
3908 /* long is never used as type */
3909 if ((t
& VT_BTYPE
) == VT_LONG
)
3910 #if (!defined TCC_TARGET_X86_64 && !defined TCC_TARGET_ARM64) || \
3911 defined TCC_TARGET_PE
3912 t
= (t
& ~VT_BTYPE
) | VT_INT
;
3914 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3920 /* convert a function parameter type (array to pointer and function to
3921 function pointer) */
3922 static inline void convert_parameter_type(CType
*pt
)
3924 /* remove const and volatile qualifiers (XXX: const could be used
3925 to indicate a const function parameter */
3926 pt
->t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3927 /* array must be transformed to pointer according to ANSI C */
3929 if ((pt
->t
& VT_BTYPE
) == VT_FUNC
) {
3934 ST_FUNC
void parse_asm_str(CString
*astr
)
3937 parse_mult_str(astr
, "string constant");
3940 /* Parse an asm label and return the token */
3941 static int asm_label_instr(void)
3947 parse_asm_str(&astr
);
3950 printf("asm_alias: \"%s\"\n", (char *)astr
.data
);
3952 v
= tok_alloc(astr
.data
, astr
.size
- 1)->tok
;
3957 static void post_type(CType
*type
, AttributeDef
*ad
, int storage
)
3959 int n
, l
, t1
, arg_size
, align
;
3960 Sym
**plast
, *s
, *first
;
3965 /* function declaration */
3973 /* read param name and compute offset */
3974 if (l
!= FUNC_OLD
) {
3975 if (!parse_btype(&pt
, &ad1
)) {
3977 tcc_error("invalid type");
3984 if ((pt
.t
& VT_BTYPE
) == VT_VOID
&& tok
== ')')
3986 type_decl(&pt
, &ad1
, &n
, TYPE_DIRECT
| TYPE_ABSTRACT
);
3987 if ((pt
.t
& VT_BTYPE
) == VT_VOID
)
3988 tcc_error("parameter declared as void");
3989 arg_size
+= (type_size(&pt
, &align
) + PTR_SIZE
- 1) / PTR_SIZE
;
3994 expect("identifier");
3998 convert_parameter_type(&pt
);
3999 s
= sym_push(n
| SYM_FIELD
, &pt
, 0, 0);
4005 if (l
== FUNC_NEW
&& tok
== TOK_DOTS
) {
4012 /* if no parameters, then old type prototype */
4016 /* NOTE: const is ignored in returned type as it has a special
4017 meaning in gcc / C++ */
4018 type
->t
&= ~VT_CONSTANT
;
4019 /* some ancient pre-K&R C allows a function to return an array
4020 and the array brackets to be put after the arguments, such
4021 that "int c()[]" means something like "int[] c()" */
4024 skip(']'); /* only handle simple "[]" */
4027 /* we push a anonymous symbol which will contain the function prototype */
4028 ad
->a
.func_args
= arg_size
;
4029 s
= sym_push(SYM_FIELD
, type
, 0, l
);
4034 } else if (tok
== '[') {
4035 int saved_nocode_wanted
= nocode_wanted
;
4036 /* array definition */
4038 if (tok
== TOK_RESTRICT1
)
4043 if (!local_stack
|| (storage
& VT_STATIC
))
4044 vpushi(expr_const());
4046 /* VLAs (which can only happen with local_stack && !VT_STATIC)
4047 length must always be evaluated, even under nocode_wanted,
4048 so that its size slot is initialized (e.g. under sizeof
4053 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
4056 tcc_error("invalid array size");
4058 if (!is_integer_btype(vtop
->type
.t
& VT_BTYPE
))
4059 tcc_error("size of variable length array should be an integer");
4064 /* parse next post type */
4065 post_type(type
, ad
, storage
);
4066 if (type
->t
== VT_FUNC
)
4067 tcc_error("declaration of an array of functions");
4068 t1
|= type
->t
& VT_VLA
;
4071 loc
-= type_size(&int_type
, &align
);
4075 vla_runtime_type_size(type
, &align
);
4077 vset(&int_type
, VT_LOCAL
|VT_LVAL
, n
);
4083 nocode_wanted
= saved_nocode_wanted
;
4085 /* we push an anonymous symbol which will contain the array
4087 s
= sym_push(SYM_FIELD
, type
, 0, n
);
4088 type
->t
= (t1
? VT_VLA
: VT_ARRAY
) | VT_PTR
;
4093 /* Parse a type declaration (except basic type), and return the type
4094 in 'type'. 'td' is a bitmask indicating which kind of type decl is
4095 expected. 'type' should contain the basic type. 'ad' is the
4096 attribute definition of the basic type. It can be modified by
4099 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
)
4102 CType type1
, *type2
;
4103 int qualifiers
, storage
;
4105 while (tok
== '*') {
4113 qualifiers
|= VT_CONSTANT
;
4118 qualifiers
|= VT_VOLATILE
;
4124 /* XXX: clarify attribute handling */
4125 case TOK_ATTRIBUTE1
:
4126 case TOK_ATTRIBUTE2
:
4127 parse_attribute(ad
);
4131 type
->t
|= qualifiers
;
4134 /* recursive type */
4135 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
4136 type1
.t
= 0; /* XXX: same as int */
4139 /* XXX: this is not correct to modify 'ad' at this point, but
4140 the syntax is not clear */
4141 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
4142 parse_attribute(ad
);
4143 type_decl(&type1
, ad
, v
, td
);
4146 /* type identifier */
4147 if (tok
>= TOK_IDENT
&& (td
& TYPE_DIRECT
)) {
4151 if (!(td
& TYPE_ABSTRACT
))
4152 expect("identifier");
4156 storage
= type
->t
& VT_STORAGE
;
4157 type
->t
&= ~VT_STORAGE
;
4158 post_type(type
, ad
, storage
);
4160 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
4161 parse_attribute(ad
);
4165 /* append type at the end of type1 */
4178 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
4179 ST_FUNC
int lvalue_type(int t
)
4184 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
4186 else if (bt
== VT_SHORT
)
4190 if (t
& VT_UNSIGNED
)
4191 r
|= VT_LVAL_UNSIGNED
;
4195 /* indirection with full error checking and bound check */
4196 ST_FUNC
void indir(void)
4198 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
) {
4199 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FUNC
)
4203 if ((vtop
->r
& VT_LVAL
) && !nocode_wanted
)
4205 vtop
->type
= *pointed_type(&vtop
->type
);
4206 /* Arrays and functions are never lvalues */
4207 if (!(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_VLA
)
4208 && (vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
4209 vtop
->r
|= lvalue_type(vtop
->type
.t
);
4210 /* if bound checking, the referenced pointer must be checked */
4211 #ifdef CONFIG_TCC_BCHECK
4212 if (tcc_state
->do_bounds_check
)
4213 vtop
->r
|= VT_MUSTBOUND
;
4218 /* pass a parameter to a function and do type checking and casting */
4219 static void gfunc_param_typed(Sym
*func
, Sym
*arg
)
4224 func_type
= func
->c
;
4225 if (func_type
== FUNC_OLD
||
4226 (func_type
== FUNC_ELLIPSIS
&& arg
== NULL
)) {
4227 /* default casting : only need to convert float to double */
4228 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
) {
4231 } else if (vtop
->type
.t
& VT_BITFIELD
) {
4232 type
.t
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
4233 type
.ref
= vtop
->type
.ref
;
4236 } else if (arg
== NULL
) {
4237 tcc_error("too many arguments to function");
4240 type
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
4241 gen_assign_cast(&type
);
4245 /* parse an expression of the form '(type)' or '(expr)' and return its
4247 static void parse_expr_type(CType
*type
)
4253 if (parse_btype(type
, &ad
)) {
4254 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
4261 static void parse_type(CType
*type
)
4266 if (!parse_btype(type
, &ad
)) {
4269 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
4272 static void vpush_tokc(int t
)
4277 vsetc(&type
, VT_CONST
, &tokc
);
4280 ST_FUNC
void unary(void)
4282 int n
, t
, align
, size
, r
, sizeof_caller
;
4287 sizeof_caller
= in_sizeof
;
4289 /* XXX: GCC 2.95.3 does not generate a table although it should be
4303 vpush_tokc(VT_INT
| VT_UNSIGNED
);
4307 vpush_tokc(VT_LLONG
);
4311 vpush_tokc(VT_LLONG
| VT_UNSIGNED
);
4315 vpush_tokc(VT_FLOAT
);
4319 vpush_tokc(VT_DOUBLE
);
4323 vpush_tokc(VT_LDOUBLE
);
4326 case TOK___FUNCTION__
:
4328 goto tok_identifier
;
4334 /* special function name identifier */
4335 len
= strlen(funcname
) + 1;
4336 /* generate char[len] type */
4341 vpush_ref(&type
, data_section
, data_section
->data_offset
, len
);
4342 ptr
= section_ptr_add(data_section
, len
);
4343 memcpy(ptr
, funcname
, len
);
4348 #ifdef TCC_TARGET_PE
4349 t
= VT_SHORT
| VT_UNSIGNED
;
4355 /* string parsing */
4358 if (tcc_state
->warn_write_strings
)
4363 memset(&ad
, 0, sizeof(AttributeDef
));
4364 decl_initializer_alloc(&type
, &ad
, VT_CONST
, 2, 0, 0);
4369 if (parse_btype(&type
, &ad
)) {
4370 type_decl(&type
, &ad
, &n
, TYPE_ABSTRACT
);
4372 /* check ISOC99 compound literal */
4374 /* data is allocated locally by default */
4379 /* all except arrays are lvalues */
4380 if (!(type
.t
& VT_ARRAY
))
4381 r
|= lvalue_type(type
.t
);
4382 memset(&ad
, 0, sizeof(AttributeDef
));
4383 decl_initializer_alloc(&type
, &ad
, r
, 1, 0, 0);
4385 if (sizeof_caller
) {
4392 } else if (tok
== '{') {
4394 tcc_error("expected constant");
4395 /* save all registers */
4398 /* statement expression : we do not accept break/continue
4399 inside as GCC does */
4400 block(NULL
, NULL
, 1);
4415 /* functions names must be treated as function pointers,
4416 except for unary '&' and sizeof. Since we consider that
4417 functions are not lvalues, we only have to handle it
4418 there and in function calls. */
4419 /* arrays can also be used although they are not lvalues */
4420 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
&&
4421 !(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_LLOCAL
))
4423 mk_pointer(&vtop
->type
);
4429 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
4431 boolean
.t
= VT_BOOL
;
4433 vtop
->c
.i
= !vtop
->c
.i
;
4434 } else if ((vtop
->r
& VT_VALMASK
) == VT_CMP
)
4438 vseti(VT_JMP
, gvtst(1, 0));
4450 if ((vtop
->type
.t
& VT_BTYPE
) == VT_PTR
)
4451 tcc_error("pointer not accepted for unary plus");
4452 /* In order to force cast, we add zero, except for floating point
4453 where we really need an noop (otherwise -0.0 will be transformed
4455 if (!is_float(vtop
->type
.t
)) {
4466 unary_type(&type
); // Perform a in_sizeof = 0;
4467 size
= type_size(&type
, &align
);
4468 if (t
== TOK_SIZEOF
) {
4469 if (!(type
.t
& VT_VLA
)) {
4471 tcc_error("sizeof applied to an incomplete type");
4474 vla_runtime_type_size(&type
, &align
);
4479 vtop
->type
.t
|= VT_UNSIGNED
;
4482 case TOK_builtin_expect
:
4484 /* __builtin_expect is a no-op for now */
4485 int saved_nocode_wanted
;
4490 saved_nocode_wanted
= nocode_wanted
;
4494 nocode_wanted
= saved_nocode_wanted
;
4498 case TOK_builtin_types_compatible_p
:
4507 type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
4508 type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
4509 vpushi(is_compatible_types(&type1
, &type2
));
4512 case TOK_builtin_choose_expr
:
4514 int saved_nocode_wanted
;
4521 saved_nocode_wanted
= nocode_wanted
;
4527 nocode_wanted
= saved_nocode_wanted
;
4531 saved_nocode_wanted
= nocode_wanted
;
4537 nocode_wanted
= saved_nocode_wanted
;
4542 case TOK_builtin_constant_p
:
4544 int saved_nocode_wanted
, res
;
4547 saved_nocode_wanted
= nocode_wanted
;
4550 res
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
4552 nocode_wanted
= saved_nocode_wanted
;
4557 case TOK_builtin_frame_address
:
4558 case TOK_builtin_return_address
:
4565 if (tok
!= TOK_CINT
) {
4566 tcc_error("%s only takes positive integers",
4567 tok1
== TOK_builtin_return_address
?
4568 "__builtin_return_address" :
4569 "__builtin_frame_address");
4571 level
= (uint32_t)tokc
.i
;
4576 vset(&type
, VT_LOCAL
, 0); /* local frame */
4578 mk_pointer(&vtop
->type
);
4579 indir(); /* -> parent frame */
4581 if (tok1
== TOK_builtin_return_address
) {
4582 // assume return address is just above frame pointer on stack
4585 mk_pointer(&vtop
->type
);
4590 #ifdef TCC_TARGET_X86_64
4591 #ifdef TCC_TARGET_PE
4592 case TOK_builtin_va_start
:
4600 if ((vtop
->r
& VT_VALMASK
) != VT_LOCAL
)
4601 tcc_error("__builtin_va_start expects a local variable");
4602 vtop
->r
&= ~(VT_LVAL
| VT_REF
);
4603 vtop
->type
= char_pointer_type
;
4609 case TOK_builtin_va_arg_types
:
4616 vpushi(classify_x86_64_va_arg(&type
));
4622 #ifdef TCC_TARGET_ARM64
4623 case TOK___va_start
: {
4625 tcc_error("statement in global scope");
4635 vtop
->type
.t
= VT_VOID
;
4638 case TOK___va_arg
: {
4641 tcc_error("statement in global scope");
4653 case TOK___arm64_clear_cache
: {
4662 vtop
->type
.t
= VT_VOID
;
4666 /* pre operations */
4677 t
= vtop
->type
.t
& VT_BTYPE
;
4679 /* In IEEE negate(x) isn't subtract(0,x), but rather
4684 else if (t
== VT_DOUBLE
)
4695 goto tok_identifier
;
4697 /* allow to take the address of a label */
4698 if (tok
< TOK_UIDENT
)
4699 expect("label identifier");
4700 s
= label_find(tok
);
4702 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
4704 if (s
->r
== LABEL_DECLARED
)
4705 s
->r
= LABEL_FORWARD
;
4708 s
->type
.t
= VT_VOID
;
4709 mk_pointer(&s
->type
);
4710 s
->type
.t
|= VT_STATIC
;
4712 vpushsym(&s
->type
, s
);
4716 // special qnan , snan and infinity values
4718 vpush64(VT_DOUBLE
, 0x7ff8000000000000ULL
);
4722 vpush64(VT_DOUBLE
, 0x7ff0000000000001ULL
);
4726 vpush64(VT_DOUBLE
, 0x7ff0000000000000ULL
);
4735 expect("identifier");
4738 const char *name
= get_tok_str(t
, NULL
);
4740 tcc_error("'%s' undeclared", name
);
4741 /* for simple function calls, we tolerate undeclared
4742 external reference to int() function */
4743 if (tcc_state
->warn_implicit_function_declaration
4744 #ifdef TCC_TARGET_PE
4745 /* people must be warned about using undeclared WINAPI functions
4746 (which usually start with uppercase letter) */
4747 || (name
[0] >= 'A' && name
[0] <= 'Z')
4750 tcc_warning("implicit declaration of function '%s'", name
);
4751 s
= external_global_sym(t
, &func_old_type
, 0);
4753 if ((s
->type
.t
& (VT_STATIC
| VT_INLINE
| VT_BTYPE
)) ==
4754 (VT_STATIC
| VT_INLINE
| VT_FUNC
)) {
4755 /* if referencing an inline function, then we generate a
4756 symbol to it if not already done. It will have the
4757 effect to generate code for it at the end of the
4758 compilation unit. Inline function as always
4759 generated in the text section. */
4760 if (!s
->c
&& !nocode_wanted
)
4761 put_extern_sym(s
, text_section
, 0, 0);
4762 r
= VT_SYM
| VT_CONST
;
4765 /* A symbol that has a register is a local register variable,
4766 which starts out as VT_LOCAL value. */
4767 if ((r
& VT_VALMASK
) < VT_CONST
)
4768 r
= (r
& ~VT_VALMASK
) | VT_LOCAL
;
4770 vset(&s
->type
, r
, s
->c
);
4771 /* Point to s as backpointer (even without r&VT_SYM).
4772 Will be used by at least the x86 inline asm parser for
4775 if (vtop
->r
& VT_SYM
) {
4781 /* post operations */
4783 if (tok
== TOK_INC
|| tok
== TOK_DEC
) {
4786 } else if (tok
== '.' || tok
== TOK_ARROW
|| tok
== TOK_CDOUBLE
) {
4789 if (tok
== TOK_ARROW
)
4791 qualifiers
= vtop
->type
.t
& (VT_CONSTANT
| VT_VOLATILE
);
4794 /* expect pointer on structure */
4795 if ((vtop
->type
.t
& VT_BTYPE
) != VT_STRUCT
)
4796 expect("struct or union");
4797 if (tok
== TOK_CDOUBLE
)
4798 expect("field name");
4800 if (tok
== TOK_CINT
|| tok
== TOK_CUINT
)
4801 expect("field name");
4802 s
= find_field(&vtop
->type
, tok
);
4804 tcc_error("field not found: %s", get_tok_str(tok
& ~SYM_FIELD
, &tokc
));
4805 /* add field offset to pointer */
4806 vtop
->type
= char_pointer_type
; /* change type to 'char *' */
4809 /* change type to field type, and set to lvalue */
4810 vtop
->type
= s
->type
;
4811 vtop
->type
.t
|= qualifiers
;
4812 /* an array is never an lvalue */
4813 if (!(vtop
->type
.t
& VT_ARRAY
)) {
4814 vtop
->r
|= lvalue_type(vtop
->type
.t
);
4815 #ifdef CONFIG_TCC_BCHECK
4816 /* if bound checking, the referenced pointer must be checked */
4817 if (tcc_state
->do_bounds_check
&& (vtop
->r
& VT_VALMASK
) != VT_LOCAL
)
4818 vtop
->r
|= VT_MUSTBOUND
;
4822 } else if (tok
== '[') {
4828 } else if (tok
== '(') {
4831 int nb_args
, ret_nregs
, ret_align
, regsize
, variadic
;
4834 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
4835 /* pointer test (no array accepted) */
4836 if ((vtop
->type
.t
& (VT_BTYPE
| VT_ARRAY
)) == VT_PTR
) {
4837 vtop
->type
= *pointed_type(&vtop
->type
);
4838 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
)
4842 expect("function pointer");
4845 vtop
->r
&= ~VT_LVAL
; /* no lvalue */
4847 /* get return type */
4850 sa
= s
->next
; /* first parameter */
4853 /* compute first implicit argument if a structure is returned */
4854 if ((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
4855 variadic
= (s
->c
== FUNC_ELLIPSIS
);
4856 ret_nregs
= gfunc_sret(&s
->type
, variadic
, &ret
.type
,
4857 &ret_align
, ®size
);
4859 /* get some space for the returned structure */
4860 size
= type_size(&s
->type
, &align
);
4861 #ifdef TCC_TARGET_ARM64
4862 /* On arm64, a small struct is return in registers.
4863 It is much easier to write it to memory if we know
4864 that we are allowed to write some extra bytes, so
4865 round the allocated space up to a power of 2: */
4867 while (size
& (size
- 1))
4868 size
= (size
| (size
- 1)) + 1;
4870 loc
= (loc
- size
) & -align
;
4872 ret
.r
= VT_LOCAL
| VT_LVAL
;
4873 /* pass it as 'int' to avoid structure arg passing
4875 vseti(VT_LOCAL
, loc
);
4885 /* return in register */
4886 if (is_float(ret
.type
.t
)) {
4887 ret
.r
= reg_fret(ret
.type
.t
);
4888 #ifdef TCC_TARGET_X86_64
4889 if ((ret
.type
.t
& VT_BTYPE
) == VT_QFLOAT
)
4893 #ifndef TCC_TARGET_ARM64
4894 #ifdef TCC_TARGET_X86_64
4895 if ((ret
.type
.t
& VT_BTYPE
) == VT_QLONG
)
4897 if ((ret
.type
.t
& VT_BTYPE
) == VT_LLONG
)
4908 gfunc_param_typed(s
, sa
);
4918 tcc_error("too few arguments to function");
4920 if (!nocode_wanted
) {
4921 gfunc_call(nb_args
);
4923 vtop
-= (nb_args
+ 1);
4927 for (r
= ret
.r
+ ret_nregs
+ !ret_nregs
; r
-- > ret
.r
;) {
4928 vsetc(&ret
.type
, r
, &ret
.c
);
4929 vtop
->r2
= ret
.r2
; /* Loop only happens when r2 is VT_CONST */
4932 /* handle packed struct return */
4933 if (((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) && ret_nregs
) {
4936 size
= type_size(&s
->type
, &align
);
4937 /* We're writing whole regs often, make sure there's enough
4938 space. Assume register size is power of 2. */
4939 if (regsize
> align
)
4941 loc
= (loc
- size
) & -align
;
4945 vset(&ret
.type
, VT_LOCAL
| VT_LVAL
, addr
+ offset
);
4949 if (--ret_nregs
== 0)
4953 vset(&s
->type
, VT_LOCAL
| VT_LVAL
, addr
);
4961 ST_FUNC
void expr_prod(void)
4966 while (tok
== '*' || tok
== '/' || tok
== '%') {
4974 ST_FUNC
void expr_sum(void)
4979 while (tok
== '+' || tok
== '-') {
4987 static void expr_shift(void)
4992 while (tok
== TOK_SHL
|| tok
== TOK_SAR
) {
5000 static void expr_cmp(void)
5005 while ((tok
>= TOK_ULE
&& tok
<= TOK_GT
) ||
5006 tok
== TOK_ULT
|| tok
== TOK_UGE
) {
5014 static void expr_cmpeq(void)
5019 while (tok
== TOK_EQ
|| tok
== TOK_NE
) {
5027 static void expr_and(void)
5030 while (tok
== '&') {
5037 static void expr_xor(void)
5040 while (tok
== '^') {
5047 static void expr_or(void)
5050 while (tok
== '|') {
5057 /* XXX: fix this mess */
5058 static void expr_land_const(void)
5061 while (tok
== TOK_LAND
) {
5067 static void expr_lor_const(void)
5070 while (tok
== TOK_LOR
) {
5077 static void expr_land(void)
5080 if (tok
== TOK_LAND
) {
5083 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
5090 int saved_nocode_wanted
= nocode_wanted
;
5092 while (tok
== TOK_LAND
) {
5099 nocode_wanted
= saved_nocode_wanted
;
5100 gen_cast(&int_type
);
5108 if (tok
!= TOK_LAND
) {
5121 static void expr_lor(void)
5124 if (tok
== TOK_LOR
) {
5127 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
5134 int saved_nocode_wanted
= nocode_wanted
;
5136 while (tok
== TOK_LOR
) {
5143 nocode_wanted
= saved_nocode_wanted
;
5144 gen_cast(&int_type
);
5152 if (tok
!= TOK_LOR
) {
5165 /* Assuming vtop is a value used in a conditional context
5166 (i.e. compared with zero) return 0 if it's false, 1 if
5167 true and -1 if it can't be statically determined. */
5168 static int condition_3way(void)
5171 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
&&
5172 (!(vtop
->r
& VT_SYM
) ||
5173 !(vtop
->sym
->type
.t
& VT_WEAK
))) {
5175 boolean
.t
= VT_BOOL
;
5184 static void expr_cond(void)
5186 int tt
, u
, r1
, r2
, rc
, t1
, t2
, bt1
, bt2
, islv
;
5189 CType type
, type1
, type2
;
5194 c
= condition_3way();
5196 int saved_nocode_wanted
= nocode_wanted
;
5198 if (tok
!= ':' || !gnu_ext
) {
5206 nocode_wanted
= saved_nocode_wanted
;
5209 if (tok
!= ':' || !gnu_ext
) {
5213 nocode_wanted
= saved_nocode_wanted
;
5220 /* XXX This doesn't handle nocode_wanted correctly at all.
5221 It unconditionally calls gv/gvtst and friends. That's
5222 the case for many of the expr_ routines. Currently
5223 that should generate only useless code, but depending
5224 on other operand handling this might also generate
5225 pointer derefs for lvalue conversions whose result
5226 is useless, but nevertheless can lead to segfault.
5228 Somewhen we need to overhaul the whole nocode_wanted
5230 if (vtop
!= vstack
) {
5231 /* needed to avoid having different registers saved in
5233 if (is_float(vtop
->type
.t
)) {
5235 #ifdef TCC_TARGET_X86_64
5236 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
5246 if (tok
== ':' && gnu_ext
) {
5254 sv
= *vtop
; /* save value to handle it later */
5255 vtop
--; /* no vpop so that FP stack is not flushed */
5263 bt1
= t1
& VT_BTYPE
;
5265 bt2
= t2
& VT_BTYPE
;
5266 /* cast operands to correct type according to ISOC rules */
5267 if (is_float(bt1
) || is_float(bt2
)) {
5268 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
5269 type
.t
= VT_LDOUBLE
;
5270 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
5275 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
5276 /* cast to biggest op */
5278 /* convert to unsigned if it does not fit in a long long */
5279 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
5280 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
5281 type
.t
|= VT_UNSIGNED
;
5282 } else if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
5283 /* If one is a null ptr constant the result type
5285 if (is_null_pointer (vtop
))
5287 else if (is_null_pointer (&sv
))
5289 /* XXX: test pointer compatibility, C99 has more elaborate
5293 } else if (bt1
== VT_FUNC
|| bt2
== VT_FUNC
) {
5294 /* XXX: test function pointer compatibility */
5295 type
= bt1
== VT_FUNC
? type1
: type2
;
5296 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
5297 /* XXX: test structure compatibility */
5298 type
= bt1
== VT_STRUCT
? type1
: type2
;
5299 } else if (bt1
== VT_VOID
|| bt2
== VT_VOID
) {
5300 /* NOTE: as an extension, we accept void on only one side */
5303 /* integer operations */
5305 /* convert to unsigned if it does not fit in an integer */
5306 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
5307 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
5308 type
.t
|= VT_UNSIGNED
;
5310 /* keep structs lvalue by transforming `(expr ? a : b)` to `*(expr ? &a : &b)` so
5311 that `(expr ? a : b).mem` does not error with "lvalue expected" */
5312 islv
= (vtop
->r
& VT_LVAL
) && (sv
.r
& VT_LVAL
) && VT_STRUCT
== (type
.t
& VT_BTYPE
);
5314 /* now we convert second operand */
5317 mk_pointer(&vtop
->type
);
5320 else if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
5323 if (is_float(type
.t
)) {
5325 #ifdef TCC_TARGET_X86_64
5326 if ((type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
5330 } else if ((type
.t
& VT_BTYPE
) == VT_LLONG
) {
5331 /* for long longs, we use fixed registers to avoid having
5332 to handle a complicated move */
5337 /* this is horrible, but we must also convert first
5341 /* put again first value and cast it */
5345 mk_pointer(&vtop
->type
);
5348 else if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
5351 move_reg(r2
, r1
, type
.t
);
5360 static void expr_eq(void)
5366 (tok
>= TOK_A_MOD
&& tok
<= TOK_A_DIV
) ||
5367 tok
== TOK_A_XOR
|| tok
== TOK_A_OR
||
5368 tok
== TOK_A_SHL
|| tok
== TOK_A_SAR
) {
5383 ST_FUNC
void gexpr(void)
5394 /* parse an expression and return its type without any side effect. */
5395 static void expr_type(CType
*type
)
5397 int saved_nocode_wanted
;
5399 saved_nocode_wanted
= nocode_wanted
;
5404 nocode_wanted
= saved_nocode_wanted
;
5407 /* parse a unary expression and return its type without any side
5409 static void unary_type(CType
*type
)
5421 /* parse a constant expression and return value in vtop. */
5422 static void expr_const1(void)
5431 /* parse an integer constant and return its value. */
5432 static inline int64_t expr_const64(void)
5436 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
5437 expect("constant expression");
5443 /* parse an integer constant and return its value.
5444 Complain if it doesn't fit 32bit (signed or unsigned). */
5445 ST_FUNC
int expr_const(void)
5448 int64_t wc
= expr_const64();
5450 if (c
!= wc
&& (unsigned)c
!= wc
)
5451 tcc_error("constant exceeds 32 bit");
5455 /* return the label token if current token is a label, otherwise
5457 static int is_label(void)
5461 /* fast test first */
5462 if (tok
< TOK_UIDENT
)
5464 /* no need to save tokc because tok is an identifier */
5471 unget_tok(last_tok
);
5476 static void label_or_decl(int l
)
5480 /* fast test first */
5481 if (tok
>= TOK_UIDENT
)
5483 /* no need to save tokc because tok is an identifier */
5487 unget_tok(last_tok
);
5490 unget_tok(last_tok
);
5495 static int case_cmp(const void *pa
, const void *pb
)
5497 int64_t a
= (*(struct case_t
**) pa
)->v1
;
5498 int64_t b
= (*(struct case_t
**) pb
)->v1
;
5499 return a
< b
? -1 : a
> b
;
5502 static void gcase(struct case_t
**base
, int len
, int *bsym
)
5506 int ll
= (vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
;
5524 gtst_addr(0, p
->sym
); /* v1 <= x <= v2 */
5526 gcase(base
, len
/2, bsym
);
5527 if (cur_switch
->def_sym
)
5528 gjmp_addr(cur_switch
->def_sym
);
5530 *bsym
= gjmp(*bsym
);
5534 base
+= e
; len
-= e
;
5544 if (p
->v1
== p
->v2
) {
5546 gtst_addr(0, p
->sym
);
5556 gtst_addr(0, p
->sym
);
5562 static void block(int *bsym
, int *csym
, int is_expr
)
5564 int a
, b
, c
, d
, cond
;
5567 /* generate line number info */
5568 if (tcc_state
->do_debug
&&
5569 (last_line_num
!= file
->line_num
|| last_ind
!= ind
)) {
5570 put_stabn(N_SLINE
, 0, file
->line_num
, ind
- func_ind
);
5572 last_line_num
= file
->line_num
;
5576 /* default return value is (void) */
5578 vtop
->type
.t
= VT_VOID
;
5581 if (tok
== TOK_IF
) {
5583 int saved_nocode_wanted
= nocode_wanted
;
5588 cond
= condition_3way();
5592 block(bsym
, csym
, 0);
5594 nocode_wanted
= saved_nocode_wanted
;
5596 if (c
== TOK_ELSE
) {
5602 block(bsym
, csym
, 0);
5603 gsym(d
); /* patch else jmp */
5605 nocode_wanted
= saved_nocode_wanted
;
5608 } else if (tok
== TOK_WHILE
) {
5609 int saved_nocode_wanted
;
5610 nocode_wanted
&= ~2;
5620 saved_nocode_wanted
= nocode_wanted
;
5622 nocode_wanted
= saved_nocode_wanted
;
5628 } else if (tok
== '{') {
5630 int block_vla_sp_loc
= vla_sp_loc
, saved_vlas_in_scope
= vlas_in_scope
;
5633 /* record local declaration stack position */
5635 llabel
= local_label_stack
;
5638 /* handle local labels declarations */
5639 if (tok
== TOK_LABEL
) {
5642 if (tok
< TOK_UIDENT
)
5643 expect("label identifier");
5644 label_push(&local_label_stack
, tok
, LABEL_DECLARED
);
5654 while (tok
!= '}') {
5655 label_or_decl(VT_LOCAL
);
5659 block(bsym
, csym
, is_expr
);
5662 /* pop locally defined labels */
5663 label_pop(&local_label_stack
, llabel
);
5664 /* pop locally defined symbols */
5666 /* In the is_expr case (a statement expression is finished here),
5667 vtop might refer to symbols on the local_stack. Either via the
5668 type or via vtop->sym. We can't pop those nor any that in turn
5669 might be referred to. To make it easier we don't roll back
5670 any symbols in that case; some upper level call to block() will
5671 do that. We do have to remove such symbols from the lookup
5672 tables, though. sym_pop will do that. */
5673 sym_pop(&local_stack
, s
, is_expr
);
5675 /* Pop VLA frames and restore stack pointer if required */
5676 if (vlas_in_scope
> saved_vlas_in_scope
) {
5677 vla_sp_loc
= saved_vlas_in_scope
? block_vla_sp_loc
: vla_sp_root_loc
;
5680 vlas_in_scope
= saved_vlas_in_scope
;
5683 } else if (tok
== TOK_RETURN
) {
5687 gen_assign_cast(&func_vt
);
5688 #ifdef TCC_TARGET_ARM64
5689 // Perhaps it would be better to use this for all backends:
5692 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
5693 CType type
, ret_type
;
5694 int ret_align
, ret_nregs
, regsize
;
5695 ret_nregs
= gfunc_sret(&func_vt
, func_var
, &ret_type
,
5696 &ret_align
, ®size
);
5697 if (0 == ret_nregs
) {
5698 /* if returning structure, must copy it to implicit
5699 first pointer arg location */
5702 vset(&type
, VT_LOCAL
| VT_LVAL
, func_vc
);
5705 /* copy structure value to pointer */
5708 /* returning structure packed into registers */
5709 int r
, size
, addr
, align
;
5710 size
= type_size(&func_vt
,&align
);
5711 if ((vtop
->r
!= (VT_LOCAL
| VT_LVAL
) ||
5712 (vtop
->c
.i
& (ret_align
-1)))
5713 && (align
& (ret_align
-1))) {
5714 loc
= (loc
- size
) & -ret_align
;
5717 vset(&type
, VT_LOCAL
| VT_LVAL
, addr
);
5721 vset(&ret_type
, VT_LOCAL
| VT_LVAL
, addr
);
5723 vtop
->type
= ret_type
;
5724 if (is_float(ret_type
.t
))
5725 r
= rc_fret(ret_type
.t
);
5736 if (--ret_nregs
== 0)
5738 /* We assume that when a structure is returned in multiple
5739 registers, their classes are consecutive values of the
5742 vtop
->c
.i
+= regsize
;
5746 } else if (is_float(func_vt
.t
)) {
5747 gv(rc_fret(func_vt
.t
));
5752 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
5755 /* jump unless last stmt in top-level block */
5756 if (tok
!= '}' || local_scope
!= 1)
5759 } else if (tok
== TOK_BREAK
) {
5762 tcc_error("cannot break");
5763 *bsym
= gjmp(*bsym
);
5767 } else if (tok
== TOK_CONTINUE
) {
5770 tcc_error("cannot continue");
5771 vla_sp_restore_root();
5772 *csym
= gjmp(*csym
);
5775 } else if (tok
== TOK_FOR
) {
5777 int saved_nocode_wanted
;
5778 nocode_wanted
&= ~2;
5784 /* c99 for-loop init decl? */
5785 if (!decl0(VT_LOCAL
, 1)) {
5786 /* no, regular for-loop init expr */
5812 saved_nocode_wanted
= nocode_wanted
;
5814 nocode_wanted
= saved_nocode_wanted
;
5820 sym_pop(&local_stack
, s
, 0);
5823 if (tok
== TOK_DO
) {
5824 int saved_nocode_wanted
;
5825 nocode_wanted
&= ~2;
5831 saved_nocode_wanted
= nocode_wanted
;
5833 nocode_wanted
= saved_nocode_wanted
;
5845 if (tok
== TOK_SWITCH
) {
5846 struct switch_t
*saved
, sw
;
5847 int saved_nocode_wanted
= nocode_wanted
;
5853 switchval
= *vtop
--;
5855 b
= gjmp(0); /* jump to first case */
5856 sw
.p
= NULL
; sw
.n
= 0; sw
.def_sym
= 0;
5860 nocode_wanted
= saved_nocode_wanted
;
5861 a
= gjmp(a
); /* add implicit break */
5864 if (!nocode_wanted
) {
5865 qsort(sw
.p
, sw
.n
, sizeof(void*), case_cmp
);
5866 for (b
= 1; b
< sw
.n
; b
++)
5867 if (sw
.p
[b
- 1]->v2
>= sw
.p
[b
]->v1
)
5868 tcc_error("duplicate case value");
5869 /* Our switch table sorting is signed, so the compared
5870 value needs to be as well when it's 64bit. */
5871 if ((switchval
.type
.t
& VT_BTYPE
) == VT_LLONG
)
5872 switchval
.type
.t
&= ~VT_UNSIGNED
;
5874 gcase(sw
.p
, sw
.n
, &a
);
5877 gjmp_addr(sw
.def_sym
);
5879 dynarray_reset(&sw
.p
, &sw
.n
);
5884 if (tok
== TOK_CASE
) {
5885 struct case_t
*cr
= tcc_malloc(sizeof(struct case_t
));
5888 nocode_wanted
&= ~2;
5890 cr
->v1
= cr
->v2
= expr_const64();
5891 if (gnu_ext
&& tok
== TOK_DOTS
) {
5893 cr
->v2
= expr_const64();
5894 if (cr
->v2
< cr
->v1
)
5895 tcc_warning("empty case range");
5898 dynarray_add((void***) &cur_switch
->p
, &cur_switch
->n
, cr
);
5901 goto block_after_label
;
5903 if (tok
== TOK_DEFAULT
) {
5908 if (cur_switch
->def_sym
)
5909 tcc_error("too many 'default'");
5910 cur_switch
->def_sym
= ind
;
5912 goto block_after_label
;
5914 if (tok
== TOK_GOTO
) {
5916 if (tok
== '*' && gnu_ext
) {
5920 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
)
5926 } else if (tok
>= TOK_UIDENT
) {
5927 s
= label_find(tok
);
5928 /* put forward definition if needed */
5930 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
5932 if (s
->r
== LABEL_DECLARED
)
5933 s
->r
= LABEL_FORWARD
;
5935 vla_sp_restore_root();
5938 else if (s
->r
& LABEL_FORWARD
)
5939 s
->jnext
= gjmp(s
->jnext
);
5941 gjmp_addr(s
->jnext
);
5944 expect("label identifier");
5947 } else if (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
) {
5955 if (s
->r
== LABEL_DEFINED
)
5956 tcc_error("duplicate label '%s'", get_tok_str(s
->v
, NULL
));
5958 s
->r
= LABEL_DEFINED
;
5960 s
= label_push(&global_label_stack
, b
, LABEL_DEFINED
);
5964 /* we accept this, but it is a mistake */
5966 nocode_wanted
&= ~2;
5968 tcc_warning("deprecated use of label at end of compound statement");
5972 block(bsym
, csym
, is_expr
);
5975 /* expression case */
5990 #define EXPR_CONST 1
5993 static void parse_init_elem(int expr_type
)
5995 int saved_global_expr
;
5998 /* compound literals must be allocated globally in this case */
5999 saved_global_expr
= global_expr
;
6002 global_expr
= saved_global_expr
;
6003 /* NOTE: symbols are accepted */
6004 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) != VT_CONST
)
6005 tcc_error("initializer element is not constant");
6013 /* t is the array or struct type. c is the array or struct
6014 address. cur_field is the pointer to the current
6015 value, for arrays the 'c' member contains the current start
6016 index and the 'r' contains the end index (in case of range init).
6017 'size_only' is true if only size info is needed (only used
6019 static void decl_designator(CType
*type
, Section
*sec
, unsigned long c
,
6020 Sym
**cur_field
, int size_only
)
6023 int notfirst
, index
, index_last
, align
, l
, nb_elems
, elem_size
;
6029 if (gnu_ext
&& (l
= is_label()) != 0)
6031 while (tok
== '[' || tok
== '.') {
6033 if (!(type
->t
& VT_ARRAY
))
6034 expect("array type");
6037 index
= expr_const();
6038 if (index
< 0 || (s
->c
>= 0 && index
>= s
->c
))
6039 tcc_error("invalid index");
6040 if (tok
== TOK_DOTS
&& gnu_ext
) {
6042 index_last
= expr_const();
6043 if (index_last
< 0 ||
6044 (s
->c
>= 0 && index_last
>= s
->c
) ||
6046 tcc_error("invalid index");
6052 (*cur_field
)->c
= index
;
6053 (*cur_field
)->r
= index_last
;
6055 type
= pointed_type(type
);
6056 elem_size
= type_size(type
, &align
);
6057 c
+= index
* elem_size
;
6058 /* NOTE: we only support ranges for last designator */
6059 nb_elems
= index_last
- index
+ 1;
6060 if (nb_elems
!= 1) {
6069 if ((type
->t
& VT_BTYPE
) != VT_STRUCT
)
6070 expect("struct/union type");
6071 f
= find_field(type
, l
);
6076 /* XXX: fix this mess by using explicit storage field */
6078 type1
.t
|= (type
->t
& ~VT_TYPE
);
6092 if (type
->t
& VT_ARRAY
) {
6093 index
= (*cur_field
)->c
;
6094 if (type
->ref
->c
>= 0 && index
>= type
->ref
->c
)
6095 tcc_error("index too large");
6096 type
= pointed_type(type
);
6097 c
+= index
* type_size(type
, &align
);
6101 tcc_error("too many field init");
6102 /* XXX: fix this mess by using explicit storage field */
6104 type1
.t
|= (type
->t
& ~VT_TYPE
);
6109 decl_initializer(type
, sec
, c
, 0, size_only
);
6111 /* XXX: make it more general */
6112 if (!size_only
&& nb_elems
> 1) {
6113 unsigned long c_end
;
6118 vset(type
, VT_LOCAL
|VT_LVAL
, c
);
6119 for (i
= 1; i
< nb_elems
; i
++) {
6120 vset(type
, VT_LOCAL
|VT_LVAL
, c
+ elem_size
* i
);
6126 c_end
= c
+ nb_elems
* elem_size
;
6127 if (c_end
> sec
->data_allocated
)
6128 section_realloc(sec
, c_end
);
6129 src
= sec
->data
+ c
;
6131 for(i
= 1; i
< nb_elems
; i
++) {
6133 memcpy(dst
, src
, elem_size
);
6139 /* store a value or an expression directly in global data or in local array */
6140 static void init_putv(CType
*type
, Section
*sec
, unsigned long c
)
6142 int bt
, bit_pos
, bit_size
;
6144 unsigned long long bit_mask
;
6148 dtype
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
6152 /* XXX: not portable */
6153 /* XXX: generate error if incorrect relocation */
6154 gen_assign_cast(&dtype
);
6155 bt
= type
->t
& VT_BTYPE
;
6156 size
= type_size(type
, &align
);
6157 if (c
+ size
> sec
->data_allocated
) {
6158 section_realloc(sec
, c
+ size
);
6160 ptr
= sec
->data
+ c
;
6161 /* XXX: make code faster ? */
6162 if (!(type
->t
& VT_BITFIELD
)) {
6164 bit_size
= PTR_SIZE
* 8;
6167 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
6168 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
6169 bit_mask
= (1LL << bit_size
) - 1;
6171 if ((vtop
->r
& (VT_SYM
|VT_CONST
)) == (VT_SYM
|VT_CONST
) &&
6172 vtop
->sym
->v
>= SYM_FIRST_ANOM
&&
6173 /* XXX This rejects compount literals like
6174 '(void *){ptr}'. The problem is that '&sym' is
6175 represented the same way, which would be ruled out
6176 by the SYM_FIRST_ANOM check above, but also '"string"'
6177 in 'char *p = "string"' is represented the same
6178 with the type being VT_PTR and the symbol being an
6179 anonymous one. That is, there's no difference in vtop
6180 between '(void *){x}' and '&(void *){x}'. Ignore
6181 pointer typed entities here. Hopefully no real code
6182 will every use compound literals with scalar type. */
6183 (vtop
->type
.t
& VT_BTYPE
) != VT_PTR
) {
6184 /* These come from compound literals, memcpy stuff over. */
6188 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[vtop
->sym
->c
];
6189 ssec
= tcc_state
->sections
[esym
->st_shndx
];
6190 memmove (ptr
, ssec
->data
+ esym
->st_value
, size
);
6192 /* We need to copy over all memory contents, and that
6193 includes relocations. Use the fact that relocs are
6194 created it order, so look from the end of relocs
6195 until we hit one before the copied region. */
6196 int num_relocs
= ssec
->reloc
->data_offset
/ sizeof(*rel
);
6197 rel
= (ElfW_Rel
*)(ssec
->reloc
->data
+ ssec
->reloc
->data_offset
);
6198 while (num_relocs
--) {
6200 if (rel
->r_offset
>= esym
->st_value
+ size
)
6202 if (rel
->r_offset
< esym
->st_value
)
6204 /* Note: if the same fields are initialized multiple
6205 times (possible with designators) then we possibly
6206 add multiple relocations for the same offset here.
6207 That would lead to wrong code, the last reloc needs
6208 to win. We clean this up later after the whole
6209 initializer is parsed. */
6210 put_elf_reloca(symtab_section
, sec
,
6211 c
+ rel
->r_offset
- esym
->st_value
,
6212 ELFW(R_TYPE
)(rel
->r_info
),
6213 ELFW(R_SYM
)(rel
->r_info
),
6214 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
6223 if ((vtop
->r
& VT_SYM
) &&
6229 (bt
== VT_LLONG
&& bit_size
!= 64) ||
6233 (bt
== VT_INT
&& bit_size
!= 32)
6236 tcc_error("initializer element is not computable at load time");
6238 /* XXX: when cross-compiling we assume that each type has the
6239 same representation on host and target, which is likely to
6240 be wrong in the case of long double */
6242 vtop
->c
.i
= (vtop
->c
.i
!= 0);
6244 *(char *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
6247 *(short *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
6250 *(double *)ptr
= vtop
->c
.d
;
6253 if (sizeof(long double) == LDOUBLE_SIZE
)
6254 *(long double *)ptr
= vtop
->c
.ld
;
6255 else if (sizeof(double) == LDOUBLE_SIZE
)
6256 *(double *)ptr
= vtop
->c
.ld
;
6258 tcc_error("can't cross compile long double constants");
6262 *(long long *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
6269 addr_t val
= (vtop
->c
.i
& bit_mask
) << bit_pos
;
6270 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
6271 if (vtop
->r
& VT_SYM
)
6272 greloca(sec
, vtop
->sym
, c
, R_DATA_PTR
, val
);
6274 *(addr_t
*)ptr
|= val
;
6276 if (vtop
->r
& VT_SYM
)
6277 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
6278 *(addr_t
*)ptr
|= val
;
6284 int val
= (vtop
->c
.i
& bit_mask
) << bit_pos
;
6285 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
6286 if (vtop
->r
& VT_SYM
)
6287 greloca(sec
, vtop
->sym
, c
, R_DATA_PTR
, val
);
6291 if (vtop
->r
& VT_SYM
)
6292 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
6301 vset(&dtype
, VT_LOCAL
|VT_LVAL
, c
);
6308 /* put zeros for variable based init */
6309 static void init_putz(Section
*sec
, unsigned long c
, int size
)
6312 /* nothing to do because globals are already set to zero */
6314 vpush_global_sym(&func_old_type
, TOK_memset
);
6316 #ifdef TCC_TARGET_ARM
6327 /* 't' contains the type and storage info. 'c' is the offset of the
6328 object in section 'sec'. If 'sec' is NULL, it means stack based
6329 allocation. 'first' is true if array '{' must be read (multi
6330 dimension implicit array init handling). 'size_only' is true if
6331 size only evaluation is wanted (only for arrays). */
6332 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
,
6333 int first
, int size_only
)
6335 int index
, array_length
, n
, no_oblock
, nb
, parlevel
, parlevel1
, i
;
6342 /* If we currently are at an '}' or ',' we have read an initializer
6343 element in one of our callers, and not yet consumed it. */
6344 have_elem
= tok
== '}' || tok
== ',';
6345 if (!have_elem
&& tok
!= '{' &&
6346 /* In case of strings we have special handling for arrays, so
6347 don't consume them as initializer value (which would commit them
6348 to some anonymous symbol). */
6349 tok
!= TOK_LSTR
&& tok
!= TOK_STR
&&
6351 parse_init_elem(!sec
? EXPR_ANY
: EXPR_CONST
);
6356 !(type
->t
& VT_ARRAY
) &&
6357 /* Use i_c_parameter_t, to strip toplevel qualifiers.
6358 The source type might have VT_CONSTANT set, which is
6359 of course assignable to non-const elements. */
6360 is_compatible_parameter_types(type
, &vtop
->type
)) {
6361 init_putv(type
, sec
, c
);
6362 } else if (type
->t
& VT_ARRAY
) {
6366 t1
= pointed_type(type
);
6367 size1
= type_size(t1
, &align1
);
6370 if ((first
&& tok
!= TOK_LSTR
&& tok
!= TOK_STR
) ||
6373 tcc_error("character array initializer must be a literal,"
6374 " optionally enclosed in braces");
6379 /* only parse strings here if correct type (otherwise: handle
6380 them as ((w)char *) expressions */
6381 if ((tok
== TOK_LSTR
&&
6382 #ifdef TCC_TARGET_PE
6383 (t1
->t
& VT_BTYPE
) == VT_SHORT
&& (t1
->t
& VT_UNSIGNED
)
6385 (t1
->t
& VT_BTYPE
) == VT_INT
6387 ) || (tok
== TOK_STR
&& (t1
->t
& VT_BTYPE
) == VT_BYTE
)) {
6388 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
6391 /* compute maximum number of chars wanted */
6393 cstr_len
= tokc
.str
.size
;
6395 cstr_len
= tokc
.str
.size
/ sizeof(nwchar_t
);
6398 if (n
>= 0 && nb
> (n
- array_length
))
6399 nb
= n
- array_length
;
6402 tcc_warning("initializer-string for array is too long");
6403 /* in order to go faster for common case (char
6404 string in global variable, we handle it
6406 if (sec
&& tok
== TOK_STR
&& size1
== 1) {
6407 memcpy(sec
->data
+ c
+ array_length
, tokc
.str
.data
, nb
);
6411 ch
= ((unsigned char *)tokc
.str
.data
)[i
];
6413 ch
= ((nwchar_t
*)tokc
.str
.data
)[i
];
6415 init_putv(t1
, sec
, c
+ (array_length
+ i
) * size1
);
6422 /* only add trailing zero if enough storage (no
6423 warning in this case since it is standard) */
6424 if (n
< 0 || array_length
< n
) {
6427 init_putv(t1
, sec
, c
+ (array_length
* size1
));
6437 while (tok
!= '}' || have_elem
) {
6438 decl_designator(type
, sec
, c
, &f
, size_only
);
6441 /* must put zero in holes (note that doing it that way
6442 ensures that it even works with designators) */
6443 if (!size_only
&& array_length
< index
) {
6444 init_putz(sec
, c
+ array_length
* size1
,
6445 (index
- array_length
) * size1
);
6447 if (type
->t
& VT_ARRAY
) {
6448 index
= indexsym
.c
= ++indexsym
.r
;
6450 index
= index
+ type_size(&f
->type
, &align1
);
6451 if (s
->type
.t
== TOK_UNION
)
6456 if (index
> array_length
)
6457 array_length
= index
;
6459 if (type
->t
& VT_ARRAY
) {
6460 /* special test for multi dimensional arrays (may not
6461 be strictly correct if designators are used at the
6463 if (no_oblock
&& index
>= n
)
6466 if (no_oblock
&& f
== NULL
)
6474 /* put zeros at the end */
6475 if (!size_only
&& array_length
< n
) {
6476 init_putz(sec
, c
+ array_length
* size1
,
6477 (n
- array_length
) * size1
);
6481 /* patch type size if needed, which happens only for array types */
6483 s
->c
= array_length
;
6484 } else if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
6487 if (first
|| tok
== '{') {
6496 } else if (tok
== '{') {
6498 decl_initializer(type
, sec
, c
, first
, size_only
);
6500 } else if (size_only
) {
6501 /* If we supported only ISO C we wouldn't have to accept calling
6502 this on anything than an array size_only==1 (and even then
6503 only on the outermost level, so no recursion would be needed),
6504 because initializing a flex array member isn't supported.
6505 But GNU C supports it, so we need to recurse even into
6506 subfields of structs and arrays when size_only is set. */
6507 /* just skip expression */
6508 parlevel
= parlevel1
= 0;
6509 while ((parlevel
> 0 || parlevel1
> 0 ||
6510 (tok
!= '}' && tok
!= ',')) && tok
!= -1) {
6513 else if (tok
== ')') {
6514 if (parlevel
== 0 && parlevel1
== 0)
6518 else if (tok
== '{')
6520 else if (tok
== '}') {
6521 if (parlevel
== 0 && parlevel1
== 0)
6529 /* This should happen only when we haven't parsed
6530 the init element above for fear of committing a
6531 string constant to memory too early. */
6532 if (tok
!= TOK_STR
&& tok
!= TOK_LSTR
)
6533 expect("string constant");
6534 parse_init_elem(!sec
? EXPR_ANY
: EXPR_CONST
);
6536 init_putv(type
, sec
, c
);
6540 /* parse an initializer for type 't' if 'has_init' is non zero, and
6541 allocate space in local or global data space ('r' is either
6542 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
6543 variable 'v' of scope 'scope' is declared before initializers
6544 are parsed. If 'v' is zero, then a reference to the new object
6545 is put in the value stack. If 'has_init' is 2, a special parsing
6546 is done to handle string constants. */
6547 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
,
6548 int has_init
, int v
, int scope
)
6550 int size
, align
, addr
, data_offset
;
6552 ParseState saved_parse_state
= {0};
6553 TokenString
*init_str
= NULL
;
6555 Sym
*flexible_array
;
6557 flexible_array
= NULL
;
6558 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
6559 Sym
*field
= type
->ref
->next
;
6562 field
= field
->next
;
6563 if (field
->type
.t
& VT_ARRAY
&& field
->type
.ref
->c
< 0)
6564 flexible_array
= field
;
6568 size
= type_size(type
, &align
);
6569 /* If unknown size, we must evaluate it before
6570 evaluating initializers because
6571 initializers can generate global data too
6572 (e.g. string pointers or ISOC99 compound
6573 literals). It also simplifies local
6574 initializers handling */
6575 if (size
< 0 || (flexible_array
&& has_init
)) {
6577 tcc_error("unknown type size");
6578 /* get all init string */
6579 init_str
= tok_str_alloc();
6580 if (has_init
== 2) {
6581 /* only get strings */
6582 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
6583 tok_str_add_tok(init_str
);
6588 while (level
> 0 || (tok
!= ',' && tok
!= ';')) {
6590 tcc_error("unexpected end of file in initializer");
6591 tok_str_add_tok(init_str
);
6594 else if (tok
== '}') {
6604 tok_str_add(init_str
, -1);
6605 tok_str_add(init_str
, 0);
6608 save_parse_state(&saved_parse_state
);
6610 begin_macro(init_str
, 1);
6612 decl_initializer(type
, NULL
, 0, 1, 1);
6613 /* prepare second initializer parsing */
6614 macro_ptr
= init_str
->str
;
6617 /* if still unknown size, error */
6618 size
= type_size(type
, &align
);
6620 tcc_error("unknown type size");
6622 /* If there's a flex member and it was used in the initializer
6624 if (flexible_array
&&
6625 flexible_array
->type
.ref
->c
> 0)
6626 size
+= flexible_array
->type
.ref
->c
6627 * pointed_size(&flexible_array
->type
);
6628 /* take into account specified alignment if bigger */
6629 if (ad
->a
.aligned
) {
6630 if (ad
->a
.aligned
> align
)
6631 align
= ad
->a
.aligned
;
6632 } else if (ad
->a
.packed
) {
6635 if ((r
& VT_VALMASK
) == VT_LOCAL
) {
6637 #ifdef CONFIG_TCC_BCHECK
6638 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
6642 loc
= (loc
- size
) & -align
;
6644 #ifdef CONFIG_TCC_BCHECK
6645 /* handles bounds */
6646 /* XXX: currently, since we do only one pass, we cannot track
6647 '&' operators, so we add only arrays */
6648 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
6650 /* add padding between regions */
6652 /* then add local bound info */
6653 bounds_ptr
= section_ptr_add(lbounds_section
, 2 * sizeof(addr_t
));
6654 bounds_ptr
[0] = addr
;
6655 bounds_ptr
[1] = size
;
6659 /* local variable */
6660 #ifdef CONFIG_TCC_ASM
6661 if (ad
->asm_label
) {
6662 int reg
= asm_parse_regvar(ad
->asm_label
);
6664 r
= (r
& ~VT_VALMASK
) | reg
;
6667 sym_push(v
, type
, r
, addr
);
6669 /* push local reference */
6670 vset(type
, r
, addr
);
6676 if (v
&& scope
== VT_CONST
) {
6677 /* see if the symbol was already defined */
6680 if (!is_compatible_types(&sym
->type
, type
))
6681 tcc_error("incompatible types for redefinition of '%s'",
6682 get_tok_str(v
, NULL
));
6683 if (sym
->type
.t
& VT_EXTERN
) {
6684 /* if the variable is extern, it was not allocated */
6685 sym
->type
.t
&= ~VT_EXTERN
;
6686 /* set array size if it was omitted in extern
6688 if ((sym
->type
.t
& VT_ARRAY
) &&
6689 sym
->type
.ref
->c
< 0 &&
6691 sym
->type
.ref
->c
= type
->ref
->c
;
6693 /* we accept several definitions of the same
6694 global variable. this is tricky, because we
6695 must play with the SHN_COMMON type of the symbol */
6696 /* XXX: should check if the variable was already
6697 initialized. It is incorrect to initialized it
6699 /* no init data, we won't add more to the symbol */
6706 /* allocate symbol in corresponding section */
6711 else if (tcc_state
->nocommon
)
6715 data_offset
= sec
->data_offset
;
6716 data_offset
= (data_offset
+ align
- 1) & -align
;
6718 /* very important to increment global pointer at this time
6719 because initializers themselves can create new initializers */
6720 data_offset
+= size
;
6721 #ifdef CONFIG_TCC_BCHECK
6722 /* add padding if bound check */
6723 if (tcc_state
->do_bounds_check
)
6726 sec
->data_offset
= data_offset
;
6727 /* allocate section space to put the data */
6728 if (sec
->sh_type
!= SHT_NOBITS
&&
6729 data_offset
> sec
->data_allocated
)
6730 section_realloc(sec
, data_offset
);
6731 /* align section if needed */
6732 if (align
> sec
->sh_addralign
)
6733 sec
->sh_addralign
= align
;
6735 addr
= 0; /* avoid warning */
6739 if (scope
!= VT_CONST
|| !sym
) {
6740 sym
= sym_push(v
, type
, r
| VT_SYM
, 0);
6741 sym
->asm_label
= ad
->asm_label
;
6743 /* update symbol definition */
6745 put_extern_sym(sym
, sec
, addr
, size
);
6748 /* put a common area */
6749 put_extern_sym(sym
, NULL
, align
, size
);
6750 /* XXX: find a nicer way */
6751 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
6752 esym
->st_shndx
= SHN_COMMON
;
6755 /* push global reference */
6756 sym
= get_sym_ref(type
, sec
, addr
, size
);
6757 vpushsym(type
, sym
);
6759 /* patch symbol weakness */
6760 if (type
->t
& VT_WEAK
)
6762 apply_visibility(sym
, type
);
6763 #ifdef CONFIG_TCC_BCHECK
6764 /* handles bounds now because the symbol must be defined
6765 before for the relocation */
6766 if (tcc_state
->do_bounds_check
) {
6769 greloc(bounds_section
, sym
, bounds_section
->data_offset
, R_DATA_PTR
);
6770 /* then add global bound info */
6771 bounds_ptr
= section_ptr_add(bounds_section
, 2 * sizeof(addr_t
));
6772 bounds_ptr
[0] = 0; /* relocated */
6773 bounds_ptr
[1] = size
;
6777 if (type
->t
& VT_VLA
) {
6780 /* save current stack pointer */
6781 if (vlas_in_scope
== 0) {
6782 if (vla_sp_root_loc
== -1)
6783 vla_sp_root_loc
= (loc
-= PTR_SIZE
);
6784 gen_vla_sp_save(vla_sp_root_loc
);
6787 vla_runtime_type_size(type
, &a
);
6788 gen_vla_alloc(type
, a
);
6789 gen_vla_sp_save(addr
);
6792 } else if (has_init
) {
6793 size_t oldreloc_offset
= 0;
6794 if (sec
&& sec
->reloc
)
6795 oldreloc_offset
= sec
->reloc
->data_offset
;
6796 decl_initializer(type
, sec
, addr
, 1, 0);
6797 if (sec
&& sec
->reloc
)
6798 squeeze_multi_relocs(sec
, oldreloc_offset
);
6799 /* patch flexible array member size back to -1, */
6800 /* for possible subsequent similar declarations */
6802 flexible_array
->type
.ref
->c
= -1;
6805 /* restore parse state if needed */
6808 restore_parse_state(&saved_parse_state
);
6812 static void put_func_debug(Sym
*sym
)
6817 /* XXX: we put here a dummy type */
6818 snprintf(buf
, sizeof(buf
), "%s:%c1",
6819 funcname
, sym
->type
.t
& VT_STATIC
? 'f' : 'F');
6820 put_stabs_r(buf
, N_FUN
, 0, file
->line_num
, 0,
6821 cur_text_section
, sym
->c
);
6822 /* //gr gdb wants a line at the function */
6823 put_stabn(N_SLINE
, 0, file
->line_num
, 0);
6828 /* parse an old style function declaration list */
6829 /* XXX: check multiple parameter */
6830 static void func_decl_list(Sym
*func_sym
)
6837 /* parse each declaration */
6838 while (tok
!= '{' && tok
!= ';' && tok
!= ',' && tok
!= TOK_EOF
&&
6839 tok
!= TOK_ASM1
&& tok
!= TOK_ASM2
&& tok
!= TOK_ASM3
) {
6840 if (!parse_btype(&btype
, &ad
))
6841 expect("declaration list");
6842 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
6843 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
6845 /* we accept no variable after */
6849 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
6850 /* find parameter in function parameter list */
6853 if ((s
->v
& ~SYM_FIELD
) == v
)
6857 tcc_error("declaration for parameter '%s' but no such parameter",
6858 get_tok_str(v
, NULL
));
6860 /* check that no storage specifier except 'register' was given */
6861 if (type
.t
& VT_STORAGE
)
6862 tcc_error("storage class specified for '%s'", get_tok_str(v
, NULL
));
6863 convert_parameter_type(&type
);
6864 /* we can add the type (NOTE: it could be local to the function) */
6866 /* accept other parameters */
6877 /* parse a function defined by symbol 'sym' and generate its code in
6878 'cur_text_section' */
6879 static void gen_function(Sym
*sym
)
6881 int saved_nocode_wanted
= nocode_wanted
;
6884 ind
= cur_text_section
->data_offset
;
6885 /* NOTE: we patch the symbol size later */
6886 put_extern_sym(sym
, cur_text_section
, ind
, 0);
6887 funcname
= get_tok_str(sym
->v
, NULL
);
6889 /* Initialize VLA state */
6891 vla_sp_root_loc
= -1;
6892 /* put debug symbol */
6893 if (tcc_state
->do_debug
)
6894 put_func_debug(sym
);
6896 /* push a dummy symbol to enable local sym storage */
6897 sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
6898 local_scope
= 1; /* for function parameters */
6899 gfunc_prolog(&sym
->type
);
6903 block(NULL
, NULL
, 0);
6906 cur_text_section
->data_offset
= ind
;
6907 label_pop(&global_label_stack
, NULL
);
6908 /* reset local stack */
6910 sym_pop(&local_stack
, NULL
, 0);
6911 /* end of function */
6912 /* patch symbol size */
6913 ((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
].st_size
=
6915 /* patch symbol weakness (this definition overrules any prototype) */
6916 if (sym
->type
.t
& VT_WEAK
)
6918 apply_visibility(sym
, &sym
->type
);
6919 if (tcc_state
->do_debug
) {
6920 put_stabn(N_FUN
, 0, 0, ind
- func_ind
);
6922 /* It's better to crash than to generate wrong code */
6923 cur_text_section
= NULL
;
6924 funcname
= ""; /* for safety */
6925 func_vt
.t
= VT_VOID
; /* for safety */
6926 func_var
= 0; /* for safety */
6927 ind
= 0; /* for safety */
6928 nocode_wanted
= saved_nocode_wanted
;
6932 static void gen_inline_functions(TCCState
*s
)
6935 int inline_generated
, i
, ln
;
6936 struct InlineFunc
*fn
;
6938 ln
= file
->line_num
;
6939 /* iterate while inline function are referenced */
6941 inline_generated
= 0;
6942 for (i
= 0; i
< s
->nb_inline_fns
; ++i
) {
6943 fn
= s
->inline_fns
[i
];
6945 if (sym
&& sym
->c
) {
6946 /* the function was used: generate its code and
6947 convert it to a normal function */
6950 pstrcpy(file
->filename
, sizeof file
->filename
, fn
->filename
);
6951 sym
->r
= VT_SYM
| VT_CONST
;
6952 sym
->type
.t
&= ~VT_INLINE
;
6954 begin_macro(fn
->func_str
, 1);
6956 cur_text_section
= text_section
;
6960 inline_generated
= 1;
6963 if (!inline_generated
)
6966 file
->line_num
= ln
;
6969 ST_FUNC
void free_inline_functions(TCCState
*s
)
6972 /* free tokens of unused inline functions */
6973 for (i
= 0; i
< s
->nb_inline_fns
; ++i
) {
6974 struct InlineFunc
*fn
= s
->inline_fns
[i
];
6976 tok_str_free(fn
->func_str
);
6978 dynarray_reset(&s
->inline_fns
, &s
->nb_inline_fns
);
6981 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
6982 static int decl0(int l
, int is_for_loop_init
)
6990 if (!parse_btype(&btype
, &ad
)) {
6991 if (is_for_loop_init
)
6993 /* skip redundant ';' */
6994 /* XXX: find more elegant solution */
6999 if (l
== VT_CONST
&&
7000 (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
7001 /* global asm block */
7005 /* special test for old K&R protos without explicit int
7006 type. Only accepted when defining global data */
7007 if (l
== VT_LOCAL
|| tok
< TOK_UIDENT
)
7011 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
7012 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
7014 if ((btype
.t
& VT_BTYPE
) == VT_STRUCT
) {
7015 int v
= btype
.ref
->v
;
7016 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) >= SYM_FIRST_ANOM
)
7017 tcc_warning("unnamed struct/union that defines no instances");
7022 while (1) { /* iterate thru each declaration */
7024 /* If the base type itself was an array type of unspecified
7025 size (like in 'typedef int arr[]; arr x = {1};') then
7026 we will overwrite the unknown size by the real one for
7027 this decl. We need to unshare the ref symbol holding
7029 if ((type
.t
& VT_ARRAY
) && type
.ref
->c
< 0) {
7030 type
.ref
= sym_push(SYM_FIELD
, &type
.ref
->type
, 0, type
.ref
->c
);
7032 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
7036 type_to_str(buf
, sizeof(buf
), t
, get_tok_str(v
, NULL
));
7037 printf("type = '%s'\n", buf
);
7040 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
7041 if ((type
.t
& VT_STATIC
) && (l
== VT_LOCAL
)) {
7042 tcc_error("function without file scope cannot be static");
7044 /* if old style function prototype, we accept a
7047 if (sym
->c
== FUNC_OLD
)
7048 func_decl_list(sym
);
7051 if (gnu_ext
&& (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
7052 ad
.asm_label
= asm_label_instr();
7053 /* parse one last attribute list, after asm label */
7054 parse_attribute(&ad
);
7061 #ifdef TCC_TARGET_PE
7062 if (ad
.a
.func_import
)
7063 type
.t
|= VT_IMPORT
;
7064 if (ad
.a
.func_export
)
7065 type
.t
|= VT_EXPORT
;
7067 type
.t
|= ad
.a
.visibility
<< VT_VIS_SHIFT
;
7071 tcc_error("cannot use local functions");
7072 if ((type
.t
& VT_BTYPE
) != VT_FUNC
)
7073 expect("function definition");
7075 /* reject abstract declarators in function definition */
7077 while ((sym
= sym
->next
) != NULL
)
7078 if (!(sym
->v
& ~SYM_FIELD
))
7079 expect("identifier");
7081 /* XXX: cannot do better now: convert extern line to static inline */
7082 if ((type
.t
& (VT_EXTERN
| VT_INLINE
)) == (VT_EXTERN
| VT_INLINE
))
7083 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
7088 if ((sym
->type
.t
& VT_BTYPE
) != VT_FUNC
)
7091 ref
= sym
->type
.ref
;
7092 if (0 == ref
->a
.func_proto
)
7093 tcc_error("redefinition of '%s'", get_tok_str(v
, NULL
));
7095 /* use func_call from prototype if not defined */
7096 if (ref
->a
.func_call
!= FUNC_CDECL
7097 && type
.ref
->a
.func_call
== FUNC_CDECL
)
7098 type
.ref
->a
.func_call
= ref
->a
.func_call
;
7100 /* use export from prototype */
7101 if (ref
->a
.func_export
)
7102 type
.ref
->a
.func_export
= 1;
7104 /* use static from prototype */
7105 if (sym
->type
.t
& VT_STATIC
)
7106 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
7108 /* If the definition has no visibility use the
7109 one from prototype. */
7110 if (! (type
.t
& VT_VIS_MASK
))
7111 type
.t
|= sym
->type
.t
& VT_VIS_MASK
;
7113 if (!is_compatible_types(&sym
->type
, &type
)) {
7115 tcc_error("incompatible types for redefinition of '%s'",
7116 get_tok_str(v
, NULL
));
7118 type
.ref
->a
.func_proto
= 0;
7119 /* if symbol is already defined, then put complete type */
7122 /* put function symbol */
7123 sym
= global_identifier_push(v
, type
.t
, 0);
7124 sym
->type
.ref
= type
.ref
;
7127 /* static inline functions are just recorded as a kind
7128 of macro. Their code will be emitted at the end of
7129 the compilation unit only if they are used */
7130 if ((type
.t
& (VT_INLINE
| VT_STATIC
)) ==
7131 (VT_INLINE
| VT_STATIC
)) {
7133 struct InlineFunc
*fn
;
7134 const char *filename
;
7136 filename
= file
? file
->filename
: "";
7137 fn
= tcc_malloc(sizeof *fn
+ strlen(filename
));
7138 strcpy(fn
->filename
, filename
);
7140 fn
->func_str
= tok_str_alloc();
7146 tcc_error("unexpected end of file");
7147 tok_str_add_tok(fn
->func_str
);
7152 } else if (t
== '}') {
7154 if (block_level
== 0)
7158 tok_str_add(fn
->func_str
, -1);
7159 tok_str_add(fn
->func_str
, 0);
7160 dynarray_add((void ***)&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
, fn
);
7163 /* compute text section */
7164 cur_text_section
= ad
.section
;
7165 if (!cur_text_section
)
7166 cur_text_section
= text_section
;
7167 sym
->r
= VT_SYM
| VT_CONST
;
7172 if (btype
.t
& VT_TYPEDEF
) {
7173 /* save typedefed type */
7174 /* XXX: test storage specifiers ? */
7176 if (sym
&& sym
->scope
== local_scope
) {
7177 if (!is_compatible_types(&sym
->type
, &type
)
7178 || !(sym
->type
.t
& VT_TYPEDEF
))
7179 tcc_error("incompatible redefinition of '%s'",
7180 get_tok_str(v
, NULL
));
7183 sym
= sym_push(v
, &type
, 0, 0);
7186 sym
->type
.t
|= VT_TYPEDEF
;
7189 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
7190 /* external function definition */
7191 /* specific case for func_call attribute */
7192 ad
.a
.func_proto
= 1;
7194 } else if (!(type
.t
& VT_ARRAY
)) {
7195 /* not lvalue if array */
7196 r
|= lvalue_type(type
.t
);
7198 has_init
= (tok
== '=');
7199 if (has_init
&& (type
.t
& VT_VLA
))
7200 tcc_error("variable length array cannot be initialized");
7201 if ((btype
.t
& VT_EXTERN
) || ((type
.t
& VT_BTYPE
) == VT_FUNC
) ||
7202 ((type
.t
& VT_ARRAY
) && (type
.t
& VT_STATIC
) &&
7203 !has_init
&& l
== VT_CONST
&& type
.ref
->c
< 0)) {
7204 /* external variable or function */
7205 /* NOTE: as GCC, uninitialized global static
7206 arrays of null size are considered as
7208 sym
= external_sym(v
, &type
, r
);
7209 sym
->asm_label
= ad
.asm_label
;
7211 if (ad
.alias_target
) {
7216 alias_target
= sym_find(ad
.alias_target
);
7217 if (!alias_target
|| !alias_target
->c
)
7218 tcc_error("unsupported forward __alias__ attribute");
7219 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[alias_target
->c
];
7220 tsec
.sh_num
= esym
->st_shndx
;
7221 put_extern_sym2(sym
, &tsec
, esym
->st_value
, esym
->st_size
, 0);
7224 type
.t
|= (btype
.t
& VT_STATIC
); /* Retain "static". */
7225 if (type
.t
& VT_STATIC
)
7231 decl_initializer_alloc(&type
, &ad
, r
, has_init
, v
, l
);
7235 if (is_for_loop_init
)
7248 ST_FUNC
void decl(int l
)
7253 /* ------------------------------------------------------------------------- */