2 * TCC - Tiny C Compiler
4 * Copyright (c) 2001-2004 Fabrice Bellard
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 /********************************************************/
24 /* global variables */
26 /* loc : local variable index
27 ind : output code index
29 anon_sym: anonymous symbol index
31 ST_DATA
int rsym
, anon_sym
, ind
, loc
;
33 ST_DATA Section
*text_section
, *data_section
, *bss_section
; /* predefined sections */
34 ST_DATA Section
*cur_text_section
; /* current section where function code is generated */
36 ST_DATA Section
*last_text_section
; /* to handle .previous asm directive */
38 #ifdef CONFIG_TCC_BCHECK
39 /* bound check related sections */
40 ST_DATA Section
*bounds_section
; /* contains global data bound description */
41 ST_DATA Section
*lbounds_section
; /* contains local data bound description */
44 ST_DATA Section
*symtab_section
, *strtab_section
;
46 ST_DATA Section
*stab_section
, *stabstr_section
;
47 ST_DATA Sym
*sym_free_first
;
48 ST_DATA
void **sym_pools
;
49 ST_DATA
int nb_sym_pools
;
51 ST_DATA Sym
*global_stack
;
52 ST_DATA Sym
*local_stack
;
53 ST_DATA Sym
*define_stack
;
54 ST_DATA Sym
*global_label_stack
;
55 ST_DATA Sym
*local_label_stack
;
57 ST_DATA SValue vstack
[VSTACK_SIZE
], *vtop
;
59 ST_DATA
int const_wanted
; /* true if constant wanted */
60 ST_DATA
int nocode_wanted
; /* true if no code generation wanted for an expression */
61 ST_DATA
int global_expr
; /* true if compound literals must be allocated globally (used during initializers parsing */
62 ST_DATA CType func_vt
; /* current function return type (used by return instruction) */
64 ST_DATA
int last_line_num
, last_ind
, func_ind
; /* debug last line number and pc */
65 ST_DATA
char *funcname
;
67 ST_DATA CType char_pointer_type
, func_old_type
, int_type
;
69 /* ------------------------------------------------------------------------- */
70 static void gen_cast(CType
*type
);
71 static inline CType
*pointed_type(CType
*type
);
72 static int is_compatible_types(CType
*type1
, CType
*type2
);
73 static int parse_btype(CType
*type
, AttributeDef
*ad
);
74 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
);
75 static void parse_expr_type(CType
*type
);
76 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
, int first
, int size_only
);
77 static void block(int *bsym
, int *csym
, int *case_sym
, int *def_sym
, int case_reg
, int is_expr
);
78 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
, int has_init
, int v
, char *asm_label
, int scope
);
79 static int decl0(int l
, int is_for_loop_init
);
80 static void expr_eq(void);
81 static void unary_type(CType
*type
);
82 static void vla_runtime_type_size(CType
*type
, int *a
);
83 static int is_compatible_parameter_types(CType
*type1
, CType
*type2
);
84 static void expr_type(CType
*type
);
86 ST_INLN
int is_float(int t
)
90 return bt
== VT_LDOUBLE
|| bt
== VT_DOUBLE
|| bt
== VT_FLOAT
;
93 /* we use our own 'finite' function to avoid potential problems with
94 non standard math libs */
95 /* XXX: endianness dependent */
96 ST_FUNC
int ieee_finite(double d
)
99 return ((unsigned)((p
[1] | 0x800fffff) + 1)) >> 31;
102 ST_FUNC
void test_lvalue(void)
104 if (!(vtop
->r
& VT_LVAL
))
108 /* ------------------------------------------------------------------------- */
109 /* symbol allocator */
110 static Sym
*__sym_malloc(void)
112 Sym
*sym_pool
, *sym
, *last_sym
;
115 sym_pool
= tcc_malloc(SYM_POOL_NB
* sizeof(Sym
));
116 dynarray_add(&sym_pools
, &nb_sym_pools
, sym_pool
);
118 last_sym
= sym_free_first
;
120 for(i
= 0; i
< SYM_POOL_NB
; i
++) {
121 sym
->next
= last_sym
;
125 sym_free_first
= last_sym
;
129 static inline Sym
*sym_malloc(void)
132 sym
= sym_free_first
;
134 sym
= __sym_malloc();
135 sym_free_first
= sym
->next
;
139 ST_INLN
void sym_free(Sym
*sym
)
141 sym
->next
= sym_free_first
;
142 tcc_free(sym
->asm_label
);
143 sym_free_first
= sym
;
146 /* push, without hashing */
147 ST_FUNC Sym
*sym_push2(Sym
**ps
, int v
, int t
, long c
)
166 /* find a symbol and return its associated structure. 's' is the top
167 of the symbol stack */
168 ST_FUNC Sym
*sym_find2(Sym
*s
, int v
)
178 /* structure lookup */
179 ST_INLN Sym
*struct_find(int v
)
182 if ((unsigned)v
>= (unsigned)(tok_ident
- TOK_IDENT
))
184 return table_ident
[v
]->sym_struct
;
187 /* find an identifier */
188 ST_INLN Sym
*sym_find(int v
)
191 if ((unsigned)v
>= (unsigned)(tok_ident
- TOK_IDENT
))
193 return table_ident
[v
]->sym_identifier
;
196 /* push a given symbol on the symbol stack */
197 ST_FUNC Sym
*sym_push(int v
, CType
*type
, int r
, int c
)
206 s
= sym_push2(ps
, v
, type
->t
, c
);
207 s
->type
.ref
= type
->ref
;
209 /* don't record fields or anonymous symbols */
211 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
212 /* record symbol in token array */
213 ts
= table_ident
[(v
& ~SYM_STRUCT
) - TOK_IDENT
];
215 ps
= &ts
->sym_struct
;
217 ps
= &ts
->sym_identifier
;
224 /* push a global identifier */
225 ST_FUNC Sym
*global_identifier_push(int v
, int t
, int c
)
228 s
= sym_push2(&global_stack
, v
, t
, c
);
229 /* don't record anonymous symbol */
230 if (v
< SYM_FIRST_ANOM
) {
231 ps
= &table_ident
[v
- TOK_IDENT
]->sym_identifier
;
232 /* modify the top most local identifier, so that
233 sym_identifier will point to 's' when popped */
235 ps
= &(*ps
)->prev_tok
;
242 /* pop symbols until top reaches 'b' */
243 ST_FUNC
void sym_pop(Sym
**ptop
, Sym
*b
)
253 /* remove symbol in token array */
255 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
256 ts
= table_ident
[(v
& ~SYM_STRUCT
) - TOK_IDENT
];
258 ps
= &ts
->sym_struct
;
260 ps
= &ts
->sym_identifier
;
269 static void weaken_symbol(Sym
*sym
)
271 sym
->type
.t
|= VT_WEAK
;
276 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
277 esym_type
= ELFW(ST_TYPE
)(esym
->st_info
);
278 esym
->st_info
= ELFW(ST_INFO
)(STB_WEAK
, esym_type
);
282 /* ------------------------------------------------------------------------- */
284 ST_FUNC
void swap(int *p
, int *q
)
292 static void vsetc(CType
*type
, int r
, CValue
*vc
)
296 if (vtop
>= vstack
+ (VSTACK_SIZE
- 1))
297 tcc_error("memory full");
298 /* cannot let cpu flags if other instruction are generated. Also
299 avoid leaving VT_JMP anywhere except on the top of the stack
300 because it would complicate the code generator. */
301 if (vtop
>= vstack
) {
302 v
= vtop
->r
& VT_VALMASK
;
303 if (v
== VT_CMP
|| (v
& ~1) == VT_JMP
)
313 /* push constant of type "type" with useless value */
314 void vpush(CType
*type
)
317 vsetc(type
, VT_CONST
, &cval
);
320 /* push integer constant */
321 ST_FUNC
void vpushi(int v
)
325 vsetc(&int_type
, VT_CONST
, &cval
);
328 /* push long long constant */
329 static void vpushll(long long v
)
336 vsetc(&ctype
, VT_CONST
, &cval
);
339 /* push arbitrary 64bit constant */
340 void vpush64(int ty
, unsigned long long v
)
346 vsetc(&ctype
, VT_CONST
, &cval
);
349 /* Return a static symbol pointing to a section */
350 ST_FUNC Sym
*get_sym_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
356 sym
= global_identifier_push(v
, type
->t
| VT_STATIC
, 0);
357 sym
->type
.ref
= type
->ref
;
358 sym
->r
= VT_CONST
| VT_SYM
;
359 put_extern_sym(sym
, sec
, offset
, size
);
363 /* push a reference to a section offset by adding a dummy symbol */
364 static void vpush_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
369 vsetc(type
, VT_CONST
| VT_SYM
, &cval
);
370 vtop
->sym
= get_sym_ref(type
, sec
, offset
, size
);
373 /* define a new external reference to a symbol 'v' of type 'u' */
374 ST_FUNC Sym
*external_global_sym(int v
, CType
*type
, int r
)
380 /* push forward reference */
381 s
= global_identifier_push(v
, type
->t
| VT_EXTERN
, 0);
382 s
->type
.ref
= type
->ref
;
383 s
->r
= r
| VT_CONST
| VT_SYM
;
388 /* define a new external reference to a symbol 'v' with alternate asm
389 name 'asm_label' of type 'u'. 'asm_label' is equal to NULL if there
390 is no alternate name (most cases) */
391 static Sym
*external_sym(int v
, CType
*type
, int r
, char *asm_label
)
397 /* push forward reference */
398 s
= sym_push(v
, type
, r
| VT_CONST
| VT_SYM
, 0);
399 s
->asm_label
= asm_label
;
400 s
->type
.t
|= VT_EXTERN
;
401 } else if (s
->type
.ref
== func_old_type
.ref
) {
402 s
->type
.ref
= type
->ref
;
403 s
->r
= r
| VT_CONST
| VT_SYM
;
404 s
->type
.t
|= VT_EXTERN
;
405 } else if (!is_compatible_types(&s
->type
, type
)) {
406 tcc_error("incompatible types for redefinition of '%s'",
407 get_tok_str(v
, NULL
));
412 /* push a reference to global symbol v */
413 ST_FUNC
void vpush_global_sym(CType
*type
, int v
)
418 sym
= external_global_sym(v
, type
, 0);
420 vsetc(type
, VT_CONST
| VT_SYM
, &cval
);
424 ST_FUNC
void vset(CType
*type
, int r
, int v
)
429 vsetc(type
, r
, &cval
);
432 static void vseti(int r
, int v
)
440 ST_FUNC
void vswap(void)
449 ST_FUNC
void vpushv(SValue
*v
)
451 if (vtop
>= vstack
+ (VSTACK_SIZE
- 1))
452 tcc_error("memory full");
457 static void vdup(void)
462 /* save r to the memory stack, and mark it as being free */
463 ST_FUNC
void save_reg(int r
)
465 int l
, saved
, size
, align
;
469 /* modify all stack values */
472 for(p
=vstack
;p
<=vtop
;p
++) {
473 if ((p
->r
& VT_VALMASK
) == r
||
474 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& (p
->r2
& VT_VALMASK
) == r
)) {
475 /* must save value on stack if not already done */
477 /* NOTE: must reload 'r' because r might be equal to r2 */
478 r
= p
->r
& VT_VALMASK
;
479 /* store register in the stack */
481 if ((p
->r
& VT_LVAL
) ||
482 (!is_float(type
->t
) && (type
->t
& VT_BTYPE
) != VT_LLONG
))
483 #ifdef TCC_TARGET_X86_64
484 type
= &char_pointer_type
;
488 size
= type_size(type
, &align
);
489 loc
= (loc
- size
) & -align
;
491 sv
.r
= VT_LOCAL
| VT_LVAL
;
494 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
495 /* x86 specific: need to pop fp register ST0 if saved */
497 o(0xd8dd); /* fstp %st(0) */
500 #ifndef TCC_TARGET_X86_64
501 /* special long long case */
502 if ((type
->t
& VT_BTYPE
) == VT_LLONG
) {
510 /* mark that stack entry as being saved on the stack */
511 if (p
->r
& VT_LVAL
) {
512 /* also clear the bounded flag because the
513 relocation address of the function was stored in
515 p
->r
= (p
->r
& ~(VT_VALMASK
| VT_BOUNDED
)) | VT_LLOCAL
;
517 p
->r
= lvalue_type(p
->type
.t
) | VT_LOCAL
;
525 #ifdef TCC_TARGET_ARM
526 /* find a register of class 'rc2' with at most one reference on stack.
527 * If none, call get_reg(rc) */
528 ST_FUNC
int get_reg_ex(int rc
, int rc2
)
533 for(r
=0;r
<NB_REGS
;r
++) {
534 if (reg_classes
[r
] & rc2
) {
537 for(p
= vstack
; p
<= vtop
; p
++) {
538 if ((p
->r
& VT_VALMASK
) == r
||
539 (p
->r2
& VT_VALMASK
) == r
)
550 /* find a free register of class 'rc'. If none, save one register */
551 ST_FUNC
int get_reg(int rc
)
556 /* find a free register */
557 for(r
=0;r
<NB_REGS
;r
++) {
558 if (reg_classes
[r
] & rc
) {
559 for(p
=vstack
;p
<=vtop
;p
++) {
560 if ((p
->r
& VT_VALMASK
) == r
||
561 (p
->r2
& VT_VALMASK
) == r
)
569 /* no register left : free the first one on the stack (VERY
570 IMPORTANT to start from the bottom to ensure that we don't
571 spill registers used in gen_opi()) */
572 for(p
=vstack
;p
<=vtop
;p
++) {
573 r
= p
->r
& VT_VALMASK
;
574 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
))
576 /* also look at second register (if long long) */
577 r
= p
->r2
& VT_VALMASK
;
578 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
)) {
584 /* Should never comes here */
588 /* save registers up to (vtop - n) stack entry */
589 ST_FUNC
void save_regs(int n
)
594 for(p
= vstack
;p
<= p1
; p
++) {
595 r
= p
->r
& VT_VALMASK
;
602 /* move register 's' to 'r', and flush previous value of r to memory
604 static void move_reg(int r
, int s
)
617 /* get address of vtop (vtop MUST BE an lvalue) */
618 static void gaddrof(void)
620 if (vtop
->r
& VT_REF
)
623 /* tricky: if saved lvalue, then we can go back to lvalue */
624 if ((vtop
->r
& VT_VALMASK
) == VT_LLOCAL
)
625 vtop
->r
= (vtop
->r
& ~(VT_VALMASK
| VT_LVAL_TYPE
)) | VT_LOCAL
| VT_LVAL
;
630 #ifdef CONFIG_TCC_BCHECK
631 /* generate lvalue bound code */
632 static void gbound(void)
637 vtop
->r
&= ~VT_MUSTBOUND
;
638 /* if lvalue, then use checking code before dereferencing */
639 if (vtop
->r
& VT_LVAL
) {
640 /* if not VT_BOUNDED value, then make one */
641 if (!(vtop
->r
& VT_BOUNDED
)) {
642 lval_type
= vtop
->r
& (VT_LVAL_TYPE
| VT_LVAL
);
643 /* must save type because we must set it to int to get pointer */
645 vtop
->type
.t
= VT_INT
;
648 gen_bounded_ptr_add();
649 vtop
->r
|= lval_type
;
652 /* then check for dereferencing */
653 gen_bounded_ptr_deref();
658 /* store vtop a register belonging to class 'rc'. lvalues are
659 converted to values. Cannot be used if cannot be converted to
660 register value (such as structures). */
661 ST_FUNC
int gv(int rc
)
663 int r
, bit_pos
, bit_size
, size
, align
, i
;
664 #ifndef TCC_TARGET_X86_64
668 /* NOTE: get_reg can modify vstack[] */
669 if (vtop
->type
.t
& VT_BITFIELD
) {
672 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
673 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
674 /* remove bit field info to avoid loops */
675 vtop
->type
.t
&= ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
));
676 /* cast to int to propagate signedness in following ops */
677 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
682 if((vtop
->type
.t
& VT_UNSIGNED
) ||
683 (vtop
->type
.t
& VT_BTYPE
) == VT_BOOL
)
684 type
.t
|= VT_UNSIGNED
;
686 /* generate shifts */
687 vpushi(bits
- (bit_pos
+ bit_size
));
689 vpushi(bits
- bit_size
);
690 /* NOTE: transformed to SHR if unsigned */
694 if (is_float(vtop
->type
.t
) &&
695 (vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
698 unsigned long offset
;
699 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
703 /* XXX: unify with initializers handling ? */
704 /* CPUs usually cannot use float constants, so we store them
705 generically in data segment */
706 size
= type_size(&vtop
->type
, &align
);
707 offset
= (data_section
->data_offset
+ align
- 1) & -align
;
708 data_section
->data_offset
= offset
;
709 /* XXX: not portable yet */
710 #if defined(__i386__) || defined(__x86_64__)
711 /* Zero pad x87 tenbyte long doubles */
712 if (size
== LDOUBLE_SIZE
) {
713 vtop
->c
.tab
[2] &= 0xffff;
714 #if LDOUBLE_SIZE == 16
719 ptr
= section_ptr_add(data_section
, size
);
721 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
725 ptr
[i
] = vtop
->c
.tab
[size
-1-i
];
729 ptr
[i
] = vtop
->c
.tab
[i
];
730 sym
= get_sym_ref(&vtop
->type
, data_section
, offset
, size
<< 2);
731 vtop
->r
|= VT_LVAL
| VT_SYM
;
735 #ifdef CONFIG_TCC_BCHECK
736 if (vtop
->r
& VT_MUSTBOUND
)
740 r
= vtop
->r
& VT_VALMASK
;
741 #ifndef TCC_TARGET_X86_64
746 /* need to reload if:
748 - lvalue (need to dereference pointer)
749 - already a register, but not in the right class */
751 || (vtop
->r
& VT_LVAL
)
752 || !(reg_classes
[r
] & rc
)
753 #ifndef TCC_TARGET_X86_64
754 || ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
&& !(reg_classes
[vtop
->r2
] & rc2
))
759 #ifndef TCC_TARGET_X86_64
760 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
762 unsigned long long ll
;
763 /* two register type load : expand to two words
765 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
768 vtop
->c
.ui
= ll
; /* first word */
770 vtop
->r
= r
; /* save register value */
771 vpushi(ll
>> 32); /* second word */
772 } else if (r
>= VT_CONST
|| /* XXX: test to VT_CONST incorrect ? */
773 (vtop
->r
& VT_LVAL
)) {
774 /* We do not want to modifier the long long
775 pointer here, so the safest (and less
776 efficient) is to save all the other registers
777 in the stack. XXX: totally inefficient. */
779 /* load from memory */
782 vtop
[-1].r
= r
; /* save register value */
783 /* increment pointer to get second word */
784 vtop
->type
.t
= VT_INT
;
793 vtop
[-1].r
= r
; /* save register value */
794 vtop
->r
= vtop
[-1].r2
;
796 /* allocate second register */
800 /* write second register */
804 if ((vtop
->r
& VT_LVAL
) && !is_float(vtop
->type
.t
)) {
806 /* lvalue of scalar type : need to use lvalue type
807 because of possible cast */
810 /* compute memory access type */
811 if (vtop
->r
& VT_LVAL_BYTE
)
813 else if (vtop
->r
& VT_LVAL_SHORT
)
815 if (vtop
->r
& VT_LVAL_UNSIGNED
)
819 /* restore wanted type */
822 /* one register type load */
827 #ifdef TCC_TARGET_C67
828 /* uses register pairs for doubles */
829 if ((vtop
->type
.t
& VT_BTYPE
) == VT_DOUBLE
)
836 /* generate vtop[-1] and vtop[0] in resp. classes rc1 and rc2 */
837 ST_FUNC
void gv2(int rc1
, int rc2
)
841 /* generate more generic register first. But VT_JMP or VT_CMP
842 values must be generated first in all cases to avoid possible
844 v
= vtop
[0].r
& VT_VALMASK
;
845 if (v
!= VT_CMP
&& (v
& ~1) != VT_JMP
&& rc1
<= rc2
) {
850 /* test if reload is needed for first register */
851 if ((vtop
[-1].r
& VT_VALMASK
) >= VT_CONST
) {
861 /* test if reload is needed for first register */
862 if ((vtop
[0].r
& VT_VALMASK
) >= VT_CONST
) {
868 /* wrapper around RC_FRET to return a register by type */
869 static int rc_fret(int t
)
871 #ifdef TCC_TARGET_X86_64
872 if (t
== VT_LDOUBLE
) {
879 /* wrapper around REG_FRET to return a register by type */
880 static int reg_fret(int t
)
882 #ifdef TCC_TARGET_X86_64
883 if (t
== VT_LDOUBLE
) {
890 /* expand long long on stack in two int registers */
891 static void lexpand(void)
895 u
= vtop
->type
.t
& VT_UNSIGNED
;
898 vtop
[0].r
= vtop
[-1].r2
;
899 vtop
[0].r2
= VT_CONST
;
900 vtop
[-1].r2
= VT_CONST
;
901 vtop
[0].type
.t
= VT_INT
| u
;
902 vtop
[-1].type
.t
= VT_INT
| u
;
905 #ifdef TCC_TARGET_ARM
906 /* expand long long on stack */
907 ST_FUNC
void lexpand_nr(void)
911 u
= vtop
->type
.t
& VT_UNSIGNED
;
914 vtop
->type
.t
= VT_INT
| u
;
915 v
=vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
);
917 vtop
[-1].c
.ui
= vtop
->c
.ull
;
918 vtop
->c
.ui
= vtop
->c
.ull
>> 32;
920 } else if (v
== (VT_LVAL
|VT_CONST
) || v
== (VT_LVAL
|VT_LOCAL
)) {
922 vtop
->r
= vtop
[-1].r
;
923 } else if (v
> VT_CONST
) {
927 vtop
->r
= vtop
[-1].r2
;
928 vtop
[-1].r2
= VT_CONST
;
929 vtop
[-1].type
.t
= VT_INT
| u
;
933 /* build a long long from two ints */
934 static void lbuild(int t
)
937 vtop
[-1].r2
= vtop
[0].r
;
942 /* rotate n first stack elements to the bottom
943 I1 ... In -> I2 ... In I1 [top is right]
945 static void vrotb(int n
)
956 /* rotate n first stack elements to the top
957 I1 ... In -> In I1 ... I(n-1) [top is right]
959 ST_FUNC
void vrott(int n
)
965 for(i
= 0;i
< n
- 1; i
++)
966 vtop
[-i
] = vtop
[-i
- 1];
970 /* pop stack value */
971 ST_FUNC
void vpop(void)
974 v
= vtop
->r
& VT_VALMASK
;
975 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
976 /* for x86, we need to pop the FP stack */
977 if (v
== TREG_ST0
&& !nocode_wanted
) {
978 o(0xd8dd); /* fstp %st(0) */
981 if (v
== VT_JMP
|| v
== VT_JMPI
) {
982 /* need to put correct jump if && or || without test */
988 /* convert stack entry to register and duplicate its value in another
990 static void gv_dup(void)
996 if ((t
& VT_BTYPE
) == VT_LLONG
) {
1003 /* stack: H L L1 H1 */
1011 /* duplicate value */
1016 #ifdef TCC_TARGET_X86_64
1017 if ((t
& VT_BTYPE
) == VT_LDOUBLE
) {
1027 load(r1
, &sv
); /* move r to r1 */
1029 /* duplicates value */
1035 #ifndef TCC_TARGET_X86_64
1036 /* generate CPU independent (unsigned) long long operations */
1037 static void gen_opl(int op
)
1039 int t
, a
, b
, op1
, c
, i
;
1041 unsigned short reg_iret
= REG_IRET
;
1042 unsigned short reg_lret
= REG_LRET
;
1048 func
= TOK___divdi3
;
1051 func
= TOK___udivdi3
;
1054 func
= TOK___moddi3
;
1057 func
= TOK___umoddi3
;
1064 /* call generic long long function */
1065 vpush_global_sym(&func_old_type
, func
);
1070 vtop
->r2
= reg_lret
;
1083 /* stack: L1 H1 L2 H2 */
1088 vtop
[-2] = vtop
[-3];
1091 /* stack: H1 H2 L1 L2 */
1097 /* stack: H1 H2 L1 L2 ML MH */
1100 /* stack: ML MH H1 H2 L1 L2 */
1104 /* stack: ML MH H1 L2 H2 L1 */
1109 /* stack: ML MH M1 M2 */
1112 } else if (op
== '+' || op
== '-') {
1113 /* XXX: add non carry method too (for MIPS or alpha) */
1119 /* stack: H1 H2 (L1 op L2) */
1122 gen_op(op1
+ 1); /* TOK_xxxC2 */
1125 /* stack: H1 H2 (L1 op L2) */
1128 /* stack: (L1 op L2) H1 H2 */
1130 /* stack: (L1 op L2) (H1 op H2) */
1138 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
1139 t
= vtop
[-1].type
.t
;
1143 /* stack: L H shift */
1145 /* constant: simpler */
1146 /* NOTE: all comments are for SHL. the other cases are
1147 done by swaping words */
1158 if (op
!= TOK_SAR
) {
1191 /* XXX: should provide a faster fallback on x86 ? */
1194 func
= TOK___ashrdi3
;
1197 func
= TOK___lshrdi3
;
1200 func
= TOK___ashldi3
;
1206 /* compare operations */
1212 /* stack: L1 H1 L2 H2 */
1214 vtop
[-1] = vtop
[-2];
1216 /* stack: L1 L2 H1 H2 */
1219 /* when values are equal, we need to compare low words. since
1220 the jump is inverted, we invert the test too. */
1223 else if (op1
== TOK_GT
)
1225 else if (op1
== TOK_ULT
)
1227 else if (op1
== TOK_UGT
)
1232 if (op1
!= TOK_NE
) {
1236 /* generate non equal test */
1237 /* XXX: NOT PORTABLE yet */
1241 #if defined(TCC_TARGET_I386)
1242 b
= psym(0x850f, 0);
1243 #elif defined(TCC_TARGET_ARM)
1245 o(0x1A000000 | encbranch(ind
, 0, 1));
1246 #elif defined(TCC_TARGET_C67)
1247 tcc_error("not implemented");
1249 #error not supported
1253 /* compare low. Always unsigned */
1257 else if (op1
== TOK_LE
)
1259 else if (op1
== TOK_GT
)
1261 else if (op1
== TOK_GE
)
1272 /* handle integer constant optimizations and various machine
1274 static void gen_opic(int op
)
1276 int c1
, c2
, t1
, t2
, n
;
1279 typedef unsigned long long U
;
1283 t1
= v1
->type
.t
& VT_BTYPE
;
1284 t2
= v2
->type
.t
& VT_BTYPE
;
1288 else if (v1
->type
.t
& VT_UNSIGNED
)
1295 else if (v2
->type
.t
& VT_UNSIGNED
)
1300 /* currently, we cannot do computations with forward symbols */
1301 c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1302 c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1305 case '+': l1
+= l2
; break;
1306 case '-': l1
-= l2
; break;
1307 case '&': l1
&= l2
; break;
1308 case '^': l1
^= l2
; break;
1309 case '|': l1
|= l2
; break;
1310 case '*': l1
*= l2
; break;
1317 /* if division by zero, generate explicit division */
1320 tcc_error("division by zero in constant");
1324 default: l1
/= l2
; break;
1325 case '%': l1
%= l2
; break;
1326 case TOK_UDIV
: l1
= (U
)l1
/ l2
; break;
1327 case TOK_UMOD
: l1
= (U
)l1
% l2
; break;
1330 case TOK_SHL
: l1
<<= l2
; break;
1331 case TOK_SHR
: l1
= (U
)l1
>> l2
; break;
1332 case TOK_SAR
: l1
>>= l2
; break;
1334 case TOK_ULT
: l1
= (U
)l1
< (U
)l2
; break;
1335 case TOK_UGE
: l1
= (U
)l1
>= (U
)l2
; break;
1336 case TOK_EQ
: l1
= l1
== l2
; break;
1337 case TOK_NE
: l1
= l1
!= l2
; break;
1338 case TOK_ULE
: l1
= (U
)l1
<= (U
)l2
; break;
1339 case TOK_UGT
: l1
= (U
)l1
> (U
)l2
; break;
1340 case TOK_LT
: l1
= l1
< l2
; break;
1341 case TOK_GE
: l1
= l1
>= l2
; break;
1342 case TOK_LE
: l1
= l1
<= l2
; break;
1343 case TOK_GT
: l1
= l1
> l2
; break;
1345 case TOK_LAND
: l1
= l1
&& l2
; break;
1346 case TOK_LOR
: l1
= l1
|| l2
; break;
1353 /* if commutative ops, put c2 as constant */
1354 if (c1
&& (op
== '+' || op
== '&' || op
== '^' ||
1355 op
== '|' || op
== '*')) {
1357 c2
= c1
; //c = c1, c1 = c2, c2 = c;
1358 l2
= l1
; //l = l1, l1 = l2, l2 = l;
1360 /* Filter out NOP operations like x*1, x-0, x&-1... */
1361 if (c2
&& (((op
== '*' || op
== '/' || op
== TOK_UDIV
||
1364 ((op
== '+' || op
== '-' || op
== '|' || op
== '^' ||
1365 op
== TOK_SHL
|| op
== TOK_SHR
|| op
== TOK_SAR
) &&
1371 } else if (c2
&& (op
== '*' || op
== TOK_PDIV
|| op
== TOK_UDIV
)) {
1372 /* try to use shifts instead of muls or divs */
1373 if (l2
> 0 && (l2
& (l2
- 1)) == 0) {
1382 else if (op
== TOK_PDIV
)
1388 } else if (c2
&& (op
== '+' || op
== '-') &&
1389 (((vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
))
1390 || (vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
)) == VT_LOCAL
)) {
1391 /* symbol + constant case */
1398 if (!nocode_wanted
) {
1399 /* call low level op generator */
1400 if (t1
== VT_LLONG
|| t2
== VT_LLONG
)
1411 /* generate a floating point operation with constant propagation */
1412 static void gen_opif(int op
)
1420 /* currently, we cannot do computations with forward symbols */
1421 c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1422 c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1424 if (v1
->type
.t
== VT_FLOAT
) {
1427 } else if (v1
->type
.t
== VT_DOUBLE
) {
1435 /* NOTE: we only do constant propagation if finite number (not
1436 NaN or infinity) (ANSI spec) */
1437 if (!ieee_finite(f1
) || !ieee_finite(f2
))
1441 case '+': f1
+= f2
; break;
1442 case '-': f1
-= f2
; break;
1443 case '*': f1
*= f2
; break;
1447 tcc_error("division by zero in constant");
1452 /* XXX: also handles tests ? */
1456 /* XXX: overflow test ? */
1457 if (v1
->type
.t
== VT_FLOAT
) {
1459 } else if (v1
->type
.t
== VT_DOUBLE
) {
1467 if (!nocode_wanted
) {
1475 static int pointed_size(CType
*type
)
1478 return type_size(pointed_type(type
), &align
);
1481 static void vla_runtime_pointed_size(CType
*type
)
1484 vla_runtime_type_size(pointed_type(type
), &align
);
1487 static inline int is_null_pointer(SValue
*p
)
1489 if ((p
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
1491 return ((p
->type
.t
& VT_BTYPE
) == VT_INT
&& p
->c
.i
== 0) ||
1492 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& p
->c
.ll
== 0);
1495 static inline int is_integer_btype(int bt
)
1497 return (bt
== VT_BYTE
|| bt
== VT_SHORT
||
1498 bt
== VT_INT
|| bt
== VT_LLONG
);
1501 /* check types for comparison or substraction of pointers */
1502 static void check_comparison_pointer_types(SValue
*p1
, SValue
*p2
, int op
)
1504 CType
*type1
, *type2
, tmp_type1
, tmp_type2
;
1507 /* null pointers are accepted for all comparisons as gcc */
1508 if (is_null_pointer(p1
) || is_null_pointer(p2
))
1512 bt1
= type1
->t
& VT_BTYPE
;
1513 bt2
= type2
->t
& VT_BTYPE
;
1514 /* accept comparison between pointer and integer with a warning */
1515 if ((is_integer_btype(bt1
) || is_integer_btype(bt2
)) && op
!= '-') {
1516 if (op
!= TOK_LOR
&& op
!= TOK_LAND
)
1517 tcc_warning("comparison between pointer and integer");
1521 /* both must be pointers or implicit function pointers */
1522 if (bt1
== VT_PTR
) {
1523 type1
= pointed_type(type1
);
1524 } else if (bt1
!= VT_FUNC
)
1525 goto invalid_operands
;
1527 if (bt2
== VT_PTR
) {
1528 type2
= pointed_type(type2
);
1529 } else if (bt2
!= VT_FUNC
) {
1531 tcc_error("invalid operands to binary %s", get_tok_str(op
, NULL
));
1533 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
1534 (type2
->t
& VT_BTYPE
) == VT_VOID
)
1538 tmp_type1
.t
&= ~(VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1539 tmp_type2
.t
&= ~(VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1540 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
1541 /* gcc-like error if '-' is used */
1543 goto invalid_operands
;
1545 tcc_warning("comparison of distinct pointer types lacks a cast");
1549 /* generic gen_op: handles types problems */
1550 ST_FUNC
void gen_op(int op
)
1552 int u
, t1
, t2
, bt1
, bt2
, t
;
1555 t1
= vtop
[-1].type
.t
;
1556 t2
= vtop
[0].type
.t
;
1557 bt1
= t1
& VT_BTYPE
;
1558 bt2
= t2
& VT_BTYPE
;
1560 if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
1561 /* at least one operand is a pointer */
1562 /* relationnal op: must be both pointers */
1563 if (op
>= TOK_ULT
&& op
<= TOK_LOR
) {
1564 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1565 /* pointers are handled are unsigned */
1566 #ifdef TCC_TARGET_X86_64
1567 t
= VT_LLONG
| VT_UNSIGNED
;
1569 t
= VT_INT
| VT_UNSIGNED
;
1573 /* if both pointers, then it must be the '-' op */
1574 if (bt1
== VT_PTR
&& bt2
== VT_PTR
) {
1576 tcc_error("cannot use pointers here");
1577 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1578 /* XXX: check that types are compatible */
1579 if (vtop
[-1].type
.t
& VT_VLA
) {
1580 vla_runtime_pointed_size(&vtop
[-1].type
);
1582 vpushi(pointed_size(&vtop
[-1].type
));
1586 /* set to integer type */
1587 #ifdef TCC_TARGET_X86_64
1588 vtop
->type
.t
= VT_LLONG
;
1590 vtop
->type
.t
= VT_INT
;
1595 /* exactly one pointer : must be '+' or '-'. */
1596 if (op
!= '-' && op
!= '+')
1597 tcc_error("cannot use pointers here");
1598 /* Put pointer as first operand */
1599 if (bt2
== VT_PTR
) {
1603 type1
= vtop
[-1].type
;
1604 type1
.t
&= ~VT_ARRAY
;
1605 if (vtop
[-1].type
.t
& VT_VLA
)
1606 vla_runtime_pointed_size(&vtop
[-1].type
);
1608 u
= pointed_size(&vtop
[-1].type
);
1610 tcc_error("unknown array element size");
1611 #ifdef TCC_TARGET_X86_64
1614 /* XXX: cast to int ? (long long case) */
1619 #ifdef CONFIG_TCC_BCHECK
1620 /* if evaluating constant expression, no code should be
1621 generated, so no bound check */
1622 if (tcc_state
->do_bounds_check
&& !const_wanted
) {
1623 /* if bounded pointers, we generate a special code to
1630 gen_bounded_ptr_add();
1636 /* put again type if gen_opic() swaped operands */
1639 } else if (is_float(bt1
) || is_float(bt2
)) {
1640 /* compute bigger type and do implicit casts */
1641 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
1643 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
1648 /* floats can only be used for a few operations */
1649 if (op
!= '+' && op
!= '-' && op
!= '*' && op
!= '/' &&
1650 (op
< TOK_ULT
|| op
> TOK_GT
))
1651 tcc_error("invalid operands for binary operation");
1653 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
1654 /* cast to biggest op */
1656 /* convert to unsigned if it does not fit in a long long */
1657 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
1658 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
1662 /* integer operations */
1664 /* convert to unsigned if it does not fit in an integer */
1665 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
1666 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
1669 /* XXX: currently, some unsigned operations are explicit, so
1670 we modify them here */
1671 if (t
& VT_UNSIGNED
) {
1678 else if (op
== TOK_LT
)
1680 else if (op
== TOK_GT
)
1682 else if (op
== TOK_LE
)
1684 else if (op
== TOK_GE
)
1691 /* special case for shifts and long long: we keep the shift as
1693 if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
)
1700 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
1701 /* relationnal op: the result is an int */
1702 vtop
->type
.t
= VT_INT
;
1709 #ifndef TCC_TARGET_ARM
1710 /* generic itof for unsigned long long case */
1711 static void gen_cvt_itof1(int t
)
1713 if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
1714 (VT_LLONG
| VT_UNSIGNED
)) {
1717 vpush_global_sym(&func_old_type
, TOK___floatundisf
);
1718 #if LDOUBLE_SIZE != 8
1719 else if (t
== VT_LDOUBLE
)
1720 vpush_global_sym(&func_old_type
, TOK___floatundixf
);
1723 vpush_global_sym(&func_old_type
, TOK___floatundidf
);
1727 vtop
->r
= reg_fret(t
);
1734 /* generic ftoi for unsigned long long case */
1735 static void gen_cvt_ftoi1(int t
)
1739 if (t
== (VT_LLONG
| VT_UNSIGNED
)) {
1740 /* not handled natively */
1741 st
= vtop
->type
.t
& VT_BTYPE
;
1743 vpush_global_sym(&func_old_type
, TOK___fixunssfdi
);
1744 #if LDOUBLE_SIZE != 8
1745 else if (st
== VT_LDOUBLE
)
1746 vpush_global_sym(&func_old_type
, TOK___fixunsxfdi
);
1749 vpush_global_sym(&func_old_type
, TOK___fixunsdfdi
);
1754 vtop
->r2
= REG_LRET
;
1760 /* force char or short cast */
1761 static void force_charshort_cast(int t
)
1765 /* XXX: add optimization if lvalue : just change type and offset */
1770 if (t
& VT_UNSIGNED
) {
1771 vpushi((1 << bits
) - 1);
1777 /* result must be signed or the SAR is converted to an SHL
1778 This was not the case when "t" was a signed short
1779 and the last value on the stack was an unsigned int */
1780 vtop
->type
.t
&= ~VT_UNSIGNED
;
1786 /* cast 'vtop' to 'type'. Casting to bitfields is forbidden. */
1787 static void gen_cast(CType
*type
)
1789 int sbt
, dbt
, sf
, df
, c
, p
;
1791 /* special delayed cast for char/short */
1792 /* XXX: in some cases (multiple cascaded casts), it may still
1794 if (vtop
->r
& VT_MUSTCAST
) {
1795 vtop
->r
&= ~VT_MUSTCAST
;
1796 force_charshort_cast(vtop
->type
.t
);
1799 /* bitfields first get cast to ints */
1800 if (vtop
->type
.t
& VT_BITFIELD
) {
1804 dbt
= type
->t
& (VT_BTYPE
| VT_UNSIGNED
);
1805 sbt
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
1810 c
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1811 p
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
);
1813 /* constant case: we can do it now */
1814 /* XXX: in ISOC, cannot do it if error in convert */
1815 if (sbt
== VT_FLOAT
)
1816 vtop
->c
.ld
= vtop
->c
.f
;
1817 else if (sbt
== VT_DOUBLE
)
1818 vtop
->c
.ld
= vtop
->c
.d
;
1821 if ((sbt
& VT_BTYPE
) == VT_LLONG
) {
1822 if (sbt
& VT_UNSIGNED
)
1823 vtop
->c
.ld
= vtop
->c
.ull
;
1825 vtop
->c
.ld
= vtop
->c
.ll
;
1827 if (sbt
& VT_UNSIGNED
)
1828 vtop
->c
.ld
= vtop
->c
.ui
;
1830 vtop
->c
.ld
= vtop
->c
.i
;
1833 if (dbt
== VT_FLOAT
)
1834 vtop
->c
.f
= (float)vtop
->c
.ld
;
1835 else if (dbt
== VT_DOUBLE
)
1836 vtop
->c
.d
= (double)vtop
->c
.ld
;
1837 } else if (sf
&& dbt
== (VT_LLONG
|VT_UNSIGNED
)) {
1838 vtop
->c
.ull
= (unsigned long long)vtop
->c
.ld
;
1839 } else if (sf
&& dbt
== VT_BOOL
) {
1840 vtop
->c
.i
= (vtop
->c
.ld
!= 0);
1843 vtop
->c
.ll
= (long long)vtop
->c
.ld
;
1844 else if (sbt
== (VT_LLONG
|VT_UNSIGNED
))
1845 vtop
->c
.ll
= vtop
->c
.ull
;
1846 else if (sbt
& VT_UNSIGNED
)
1847 vtop
->c
.ll
= vtop
->c
.ui
;
1848 #ifdef TCC_TARGET_X86_64
1849 else if (sbt
== VT_PTR
)
1852 else if (sbt
!= VT_LLONG
)
1853 vtop
->c
.ll
= vtop
->c
.i
;
1855 if (dbt
== (VT_LLONG
|VT_UNSIGNED
))
1856 vtop
->c
.ull
= vtop
->c
.ll
;
1857 else if (dbt
== VT_BOOL
)
1858 vtop
->c
.i
= (vtop
->c
.ll
!= 0);
1859 else if (dbt
!= VT_LLONG
) {
1861 if ((dbt
& VT_BTYPE
) == VT_BYTE
)
1863 else if ((dbt
& VT_BTYPE
) == VT_SHORT
)
1866 if(dbt
& VT_UNSIGNED
)
1867 vtop
->c
.ui
= ((unsigned int)vtop
->c
.ll
<< s
) >> s
;
1869 vtop
->c
.i
= ((int)vtop
->c
.ll
<< s
) >> s
;
1872 } else if (p
&& dbt
== VT_BOOL
) {
1875 } else if (!nocode_wanted
) {
1876 /* non constant case: generate code */
1878 /* convert from fp to fp */
1881 /* convert int to fp */
1884 /* convert fp to int */
1885 if (dbt
== VT_BOOL
) {
1889 /* we handle char/short/etc... with generic code */
1890 if (dbt
!= (VT_INT
| VT_UNSIGNED
) &&
1891 dbt
!= (VT_LLONG
| VT_UNSIGNED
) &&
1895 if (dbt
== VT_INT
&& (type
->t
& (VT_BTYPE
| VT_UNSIGNED
)) != dbt
) {
1896 /* additional cast for char/short... */
1901 #ifndef TCC_TARGET_X86_64
1902 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
) {
1903 if ((sbt
& VT_BTYPE
) != VT_LLONG
) {
1904 /* scalar to long long */
1905 /* machine independent conversion */
1907 /* generate high word */
1908 if (sbt
== (VT_INT
| VT_UNSIGNED
)) {
1912 if (sbt
== VT_PTR
) {
1913 /* cast from pointer to int before we apply
1914 shift operation, which pointers don't support*/
1915 gen_cast(&int_type
);
1921 /* patch second register */
1922 vtop
[-1].r2
= vtop
->r
;
1926 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
||
1927 (dbt
& VT_BTYPE
) == VT_PTR
||
1928 (dbt
& VT_BTYPE
) == VT_FUNC
) {
1929 if ((sbt
& VT_BTYPE
) != VT_LLONG
&&
1930 (sbt
& VT_BTYPE
) != VT_PTR
&&
1931 (sbt
& VT_BTYPE
) != VT_FUNC
) {
1932 /* need to convert from 32bit to 64bit */
1934 if (sbt
!= (VT_INT
| VT_UNSIGNED
)) {
1935 /* x86_64 specific: movslq */
1937 o(0xc0 + (REG_VALUE(r
) << 3) + REG_VALUE(r
));
1941 } else if (dbt
== VT_BOOL
) {
1942 /* scalar to bool */
1945 } else if ((dbt
& VT_BTYPE
) == VT_BYTE
||
1946 (dbt
& VT_BTYPE
) == VT_SHORT
) {
1947 if (sbt
== VT_PTR
) {
1948 vtop
->type
.t
= VT_INT
;
1949 tcc_warning("nonportable conversion from pointer to char/short");
1951 force_charshort_cast(dbt
);
1952 } else if ((dbt
& VT_BTYPE
) == VT_INT
) {
1954 if (sbt
== VT_LLONG
) {
1955 /* from long long: just take low order word */
1959 /* if lvalue and single word type, nothing to do because
1960 the lvalue already contains the real type size (see
1961 VT_LVAL_xxx constants) */
1964 } else if ((dbt
& VT_BTYPE
) == VT_PTR
&& !(vtop
->r
& VT_LVAL
)) {
1965 /* if we are casting between pointer types,
1966 we must update the VT_LVAL_xxx size */
1967 vtop
->r
= (vtop
->r
& ~VT_LVAL_TYPE
)
1968 | (lvalue_type(type
->ref
->type
.t
) & VT_LVAL_TYPE
);
1973 /* return type size as known at compile time. Put alignment at 'a' */
1974 ST_FUNC
int type_size(CType
*type
, int *a
)
1979 bt
= type
->t
& VT_BTYPE
;
1980 if (bt
== VT_STRUCT
) {
1985 } else if (bt
== VT_PTR
) {
1986 if (type
->t
& VT_ARRAY
) {
1990 ts
= type_size(&s
->type
, a
);
1992 if (ts
< 0 && s
->c
< 0)
2000 } else if (bt
== VT_LDOUBLE
) {
2002 return LDOUBLE_SIZE
;
2003 } else if (bt
== VT_DOUBLE
|| bt
== VT_LLONG
) {
2004 #ifdef TCC_TARGET_I386
2005 #ifdef TCC_TARGET_PE
2010 #elif defined(TCC_TARGET_ARM)
2020 } else if (bt
== VT_INT
|| bt
== VT_ENUM
|| bt
== VT_FLOAT
) {
2023 } else if (bt
== VT_SHORT
) {
2027 /* char, void, function, _Bool */
2033 /* push type size as known at runtime time on top of value stack. Put
2035 ST_FUNC
void vla_runtime_type_size(CType
*type
, int *a
)
2037 if (type
->t
& VT_VLA
) {
2038 vset(&int_type
, VT_LOCAL
|VT_LVAL
, type
->ref
->c
);
2040 vpushi(type_size(type
, a
));
2044 /* return the pointed type of t */
2045 static inline CType
*pointed_type(CType
*type
)
2047 return &type
->ref
->type
;
2050 /* modify type so that its it is a pointer to type. */
2051 ST_FUNC
void mk_pointer(CType
*type
)
2054 s
= sym_push(SYM_FIELD
, type
, 0, -1);
2055 type
->t
= VT_PTR
| (type
->t
& ~VT_TYPE
);
2059 /* compare function types. OLD functions match any new functions */
2060 static int is_compatible_func(CType
*type1
, CType
*type2
)
2066 if (!is_compatible_types(&s1
->type
, &s2
->type
))
2068 /* check func_call */
2069 if (FUNC_CALL(s1
->r
) != FUNC_CALL(s2
->r
))
2071 /* XXX: not complete */
2072 if (s1
->c
== FUNC_OLD
|| s2
->c
== FUNC_OLD
)
2076 while (s1
!= NULL
) {
2079 if (!is_compatible_parameter_types(&s1
->type
, &s2
->type
))
2089 /* return true if type1 and type2 are the same. If unqualified is
2090 true, qualifiers on the types are ignored.
2092 - enums are not checked as gcc __builtin_types_compatible_p ()
2094 static int compare_types(CType
*type1
, CType
*type2
, int unqualified
)
2098 t1
= type1
->t
& VT_TYPE
;
2099 t2
= type2
->t
& VT_TYPE
;
2101 /* strip qualifiers before comparing */
2102 t1
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2103 t2
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2105 /* XXX: bitfields ? */
2108 /* test more complicated cases */
2109 bt1
= t1
& VT_BTYPE
;
2110 if (bt1
== VT_PTR
) {
2111 type1
= pointed_type(type1
);
2112 type2
= pointed_type(type2
);
2113 return is_compatible_types(type1
, type2
);
2114 } else if (bt1
== VT_STRUCT
) {
2115 return (type1
->ref
== type2
->ref
);
2116 } else if (bt1
== VT_FUNC
) {
2117 return is_compatible_func(type1
, type2
);
2123 /* return true if type1 and type2 are exactly the same (including
2126 static int is_compatible_types(CType
*type1
, CType
*type2
)
2128 return compare_types(type1
,type2
,0);
2131 /* return true if type1 and type2 are the same (ignoring qualifiers).
2133 static int is_compatible_parameter_types(CType
*type1
, CType
*type2
)
2135 return compare_types(type1
,type2
,1);
2138 /* print a type. If 'varstr' is not NULL, then the variable is also
2139 printed in the type */
2141 /* XXX: add array and function pointers */
2142 static void type_to_str(char *buf
, int buf_size
,
2143 CType
*type
, const char *varstr
)
2150 t
= type
->t
& VT_TYPE
;
2153 if (t
& VT_CONSTANT
)
2154 pstrcat(buf
, buf_size
, "const ");
2155 if (t
& VT_VOLATILE
)
2156 pstrcat(buf
, buf_size
, "volatile ");
2157 if (t
& VT_UNSIGNED
)
2158 pstrcat(buf
, buf_size
, "unsigned ");
2188 tstr
= "long double";
2190 pstrcat(buf
, buf_size
, tstr
);
2194 if (bt
== VT_STRUCT
)
2198 pstrcat(buf
, buf_size
, tstr
);
2199 v
= type
->ref
->v
& ~SYM_STRUCT
;
2200 if (v
>= SYM_FIRST_ANOM
)
2201 pstrcat(buf
, buf_size
, "<anonymous>");
2203 pstrcat(buf
, buf_size
, get_tok_str(v
, NULL
));
2207 type_to_str(buf
, buf_size
, &s
->type
, varstr
);
2208 pstrcat(buf
, buf_size
, "(");
2210 while (sa
!= NULL
) {
2211 type_to_str(buf1
, sizeof(buf1
), &sa
->type
, NULL
);
2212 pstrcat(buf
, buf_size
, buf1
);
2215 pstrcat(buf
, buf_size
, ", ");
2217 pstrcat(buf
, buf_size
, ")");
2221 pstrcpy(buf1
, sizeof(buf1
), "*");
2223 pstrcat(buf1
, sizeof(buf1
), varstr
);
2224 type_to_str(buf
, buf_size
, &s
->type
, buf1
);
2228 pstrcat(buf
, buf_size
, " ");
2229 pstrcat(buf
, buf_size
, varstr
);
2234 /* verify type compatibility to store vtop in 'dt' type, and generate
2236 static void gen_assign_cast(CType
*dt
)
2238 CType
*st
, *type1
, *type2
, tmp_type1
, tmp_type2
;
2239 char buf1
[256], buf2
[256];
2242 st
= &vtop
->type
; /* source type */
2243 dbt
= dt
->t
& VT_BTYPE
;
2244 sbt
= st
->t
& VT_BTYPE
;
2246 tcc_error("Cannot assign void value");
2247 if (dt
->t
& VT_CONSTANT
)
2248 tcc_warning("assignment of read-only location");
2251 /* special cases for pointers */
2252 /* '0' can also be a pointer */
2253 if (is_null_pointer(vtop
))
2255 /* accept implicit pointer to integer cast with warning */
2256 if (is_integer_btype(sbt
)) {
2257 tcc_warning("assignment makes pointer from integer without a cast");
2260 type1
= pointed_type(dt
);
2261 /* a function is implicitely a function pointer */
2262 if (sbt
== VT_FUNC
) {
2263 if ((type1
->t
& VT_BTYPE
) != VT_VOID
&&
2264 !is_compatible_types(pointed_type(dt
), st
))
2265 tcc_warning("assignment from incompatible pointer type");
2270 type2
= pointed_type(st
);
2271 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
2272 (type2
->t
& VT_BTYPE
) == VT_VOID
) {
2273 /* void * can match anything */
2275 /* exact type match, except for unsigned */
2278 tmp_type1
.t
&= ~(VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
2279 tmp_type2
.t
&= ~(VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
2280 if (!is_compatible_types(&tmp_type1
, &tmp_type2
))
2281 tcc_warning("assignment from incompatible pointer type");
2283 /* check const and volatile */
2284 if ((!(type1
->t
& VT_CONSTANT
) && (type2
->t
& VT_CONSTANT
)) ||
2285 (!(type1
->t
& VT_VOLATILE
) && (type2
->t
& VT_VOLATILE
)))
2286 tcc_warning("assignment discards qualifiers from pointer target type");
2292 if (sbt
== VT_PTR
|| sbt
== VT_FUNC
) {
2293 tcc_warning("assignment makes integer from pointer without a cast");
2295 /* XXX: more tests */
2300 tmp_type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2301 tmp_type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2302 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
2304 type_to_str(buf1
, sizeof(buf1
), st
, NULL
);
2305 type_to_str(buf2
, sizeof(buf2
), dt
, NULL
);
2306 tcc_error("cannot cast '%s' to '%s'", buf1
, buf2
);
2314 /* store vtop in lvalue pushed on stack */
2315 ST_FUNC
void vstore(void)
2317 int sbt
, dbt
, ft
, r
, t
, size
, align
, bit_size
, bit_pos
, rc
, delayed_cast
;
2319 ft
= vtop
[-1].type
.t
;
2320 sbt
= vtop
->type
.t
& VT_BTYPE
;
2321 dbt
= ft
& VT_BTYPE
;
2322 if (((sbt
== VT_INT
|| sbt
== VT_SHORT
) && dbt
== VT_BYTE
) ||
2323 (sbt
== VT_INT
&& dbt
== VT_SHORT
)) {
2324 /* optimize char/short casts */
2325 delayed_cast
= VT_MUSTCAST
;
2326 vtop
->type
.t
= ft
& (VT_TYPE
& ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
)));
2327 /* XXX: factorize */
2328 if (ft
& VT_CONSTANT
)
2329 tcc_warning("assignment of read-only location");
2332 if (!(ft
& VT_BITFIELD
))
2333 gen_assign_cast(&vtop
[-1].type
);
2336 if (sbt
== VT_STRUCT
) {
2337 /* if structure, only generate pointer */
2338 /* structure assignment : generate memcpy */
2339 /* XXX: optimize if small size */
2340 if (!nocode_wanted
) {
2341 size
= type_size(&vtop
->type
, &align
);
2345 vtop
->type
.t
= VT_PTR
;
2348 /* address of memcpy() */
2351 vpush_global_sym(&func_old_type
, TOK_memcpy8
);
2352 else if(!(align
& 3))
2353 vpush_global_sym(&func_old_type
, TOK_memcpy4
);
2356 vpush_global_sym(&func_old_type
, TOK_memcpy
);
2361 vtop
->type
.t
= VT_PTR
;
2370 /* leave source on stack */
2371 } else if (ft
& VT_BITFIELD
) {
2372 /* bitfield store handling */
2373 bit_pos
= (ft
>> VT_STRUCT_SHIFT
) & 0x3f;
2374 bit_size
= (ft
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
2375 /* remove bit field info to avoid loops */
2376 vtop
[-1].type
.t
= ft
& ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
));
2378 /* duplicate source into other register */
2383 if((ft
& VT_BTYPE
) == VT_BOOL
) {
2384 gen_cast(&vtop
[-1].type
);
2385 vtop
[-1].type
.t
= (vtop
[-1].type
.t
& ~VT_BTYPE
) | (VT_BYTE
| VT_UNSIGNED
);
2388 /* duplicate destination */
2390 vtop
[-1] = vtop
[-2];
2392 /* mask and shift source */
2393 if((ft
& VT_BTYPE
) != VT_BOOL
) {
2394 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2395 vpushll((1ULL << bit_size
) - 1ULL);
2397 vpushi((1 << bit_size
) - 1);
2403 /* load destination, mask and or with source */
2405 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2406 vpushll(~(((1ULL << bit_size
) - 1ULL) << bit_pos
));
2408 vpushi(~(((1 << bit_size
) - 1) << bit_pos
));
2415 /* pop off shifted source from "duplicate source..." above */
2419 #ifdef CONFIG_TCC_BCHECK
2420 /* bound check case */
2421 if (vtop
[-1].r
& VT_MUSTBOUND
) {
2427 if (!nocode_wanted
) {
2431 #ifdef TCC_TARGET_X86_64
2432 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
2437 r
= gv(rc
); /* generate value */
2438 /* if lvalue was saved on stack, must read it */
2439 if ((vtop
[-1].r
& VT_VALMASK
) == VT_LLOCAL
) {
2441 t
= get_reg(RC_INT
);
2442 #ifdef TCC_TARGET_X86_64
2447 sv
.r
= VT_LOCAL
| VT_LVAL
;
2448 sv
.c
.ul
= vtop
[-1].c
.ul
;
2450 vtop
[-1].r
= t
| VT_LVAL
;
2453 #ifndef TCC_TARGET_X86_64
2454 /* two word case handling : store second register at word + 4 */
2455 if ((ft
& VT_BTYPE
) == VT_LLONG
) {
2457 /* convert to int to increment easily */
2458 vtop
->type
.t
= VT_INT
;
2464 /* XXX: it works because r2 is spilled last ! */
2465 store(vtop
->r2
, vtop
- 1);
2470 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
2471 vtop
->r
|= delayed_cast
;
2475 /* post defines POST/PRE add. c is the token ++ or -- */
2476 ST_FUNC
void inc(int post
, int c
)
2479 vdup(); /* save lvalue */
2481 gv_dup(); /* duplicate value */
2486 vpushi(c
- TOK_MID
);
2488 vstore(); /* store value */
2490 vpop(); /* if post op, return saved value */
2493 /* Parse GNUC __attribute__ extension. Currently, the following
2494 extensions are recognized:
2495 - aligned(n) : set data/function alignment.
2496 - packed : force data alignment to 1
2497 - section(x) : generate data/code in this section.
2498 - unused : currently ignored, but may be used someday.
2499 - regparm(n) : pass function parameters in registers (i386 only)
2501 static void parse_attribute(AttributeDef
*ad
)
2505 while (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
) {
2509 while (tok
!= ')') {
2510 if (tok
< TOK_IDENT
)
2511 expect("attribute name");
2519 expect("section name");
2520 ad
->section
= find_section(tcc_state
, (char *)tokc
.cstr
->data
);
2528 expect("alias(\"target\")");
2529 ad
->alias_target
= /* save string as token, for later */
2530 tok_alloc((char*)tokc
.cstr
->data
, tokc
.cstr
->size
-1)->tok
;
2539 if (n
<= 0 || (n
& (n
- 1)) != 0)
2540 tcc_error("alignment must be a positive power of two");
2557 /* currently, no need to handle it because tcc does not
2558 track unused objects */
2562 /* currently, no need to handle it because tcc does not
2563 track unused objects */
2568 ad
->func_call
= FUNC_CDECL
;
2573 ad
->func_call
= FUNC_STDCALL
;
2575 #ifdef TCC_TARGET_I386
2585 ad
->func_call
= FUNC_FASTCALL1
+ n
- 1;
2591 ad
->func_call
= FUNC_FASTCALLW
;
2598 ad
->mode
= VT_LLONG
+ 1;
2601 ad
->mode
= VT_SHORT
+ 1;
2604 ad
->mode
= VT_INT
+ 1;
2607 tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok
, NULL
));
2614 ad
->func_export
= 1;
2617 ad
->func_import
= 1;
2620 if (tcc_state
->warn_unsupported
)
2621 tcc_warning("'%s' attribute ignored", get_tok_str(t
, NULL
));
2622 /* skip parameters */
2624 int parenthesis
= 0;
2628 else if (tok
== ')')
2631 } while (parenthesis
&& tok
!= -1);
2644 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
2645 static void struct_decl(CType
*type
, int u
)
2647 int a
, v
, size
, align
, maxalign
, c
, offset
;
2648 int bit_size
, bit_pos
, bsize
, bt
, lbit_pos
, prevbt
;
2649 Sym
*s
, *ss
, *ass
, **ps
;
2653 a
= tok
; /* save decl type */
2658 /* struct already defined ? return it */
2660 expect("struct/union/enum name");
2664 tcc_error("invalid type");
2671 /* we put an undefined size for struct/union */
2672 s
= sym_push(v
| SYM_STRUCT
, &type1
, 0, -1);
2673 s
->r
= 0; /* default alignment is zero as gcc */
2674 /* put struct/union/enum name in type */
2682 tcc_error("struct/union/enum already defined");
2683 /* cannot be empty */
2685 /* non empty enums are not allowed */
2686 if (a
== TOK_ENUM
) {
2690 expect("identifier");
2696 /* enum symbols have static storage */
2697 ss
= sym_push(v
, &int_type
, VT_CONST
, c
);
2698 ss
->type
.t
|= VT_STATIC
;
2703 /* NOTE: we accept a trailing comma */
2714 while (tok
!= '}') {
2715 parse_btype(&btype
, &ad
);
2721 type_decl(&type1
, &ad
, &v
, TYPE_DIRECT
| TYPE_ABSTRACT
);
2722 if (v
== 0 && (type1
.t
& VT_BTYPE
) != VT_STRUCT
)
2723 expect("identifier");
2724 if ((type1
.t
& VT_BTYPE
) == VT_FUNC
||
2725 (type1
.t
& (VT_TYPEDEF
| VT_STATIC
| VT_EXTERN
| VT_INLINE
)))
2726 tcc_error("invalid type for '%s'",
2727 get_tok_str(v
, NULL
));
2731 bit_size
= expr_const();
2732 /* XXX: handle v = 0 case for messages */
2734 tcc_error("negative width in bit-field '%s'",
2735 get_tok_str(v
, NULL
));
2736 if (v
&& bit_size
== 0)
2737 tcc_error("zero width for bit-field '%s'",
2738 get_tok_str(v
, NULL
));
2740 size
= type_size(&type1
, &align
);
2742 if (align
< ad
.aligned
)
2744 } else if (ad
.packed
) {
2746 } else if (*tcc_state
->pack_stack_ptr
) {
2747 if (align
> *tcc_state
->pack_stack_ptr
)
2748 align
= *tcc_state
->pack_stack_ptr
;
2751 if (bit_size
>= 0) {
2752 bt
= type1
.t
& VT_BTYPE
;
2759 tcc_error("bitfields must have scalar type");
2761 if (bit_size
> bsize
) {
2762 tcc_error("width of '%s' exceeds its type",
2763 get_tok_str(v
, NULL
));
2764 } else if (bit_size
== bsize
) {
2765 /* no need for bit fields */
2767 } else if (bit_size
== 0) {
2768 /* XXX: what to do if only padding in a
2770 /* zero size: means to pad */
2773 /* we do not have enough room ?
2774 did the type change?
2776 if ((bit_pos
+ bit_size
) > bsize
||
2777 bt
!= prevbt
|| a
== TOK_UNION
)
2780 /* XXX: handle LSB first */
2781 type1
.t
|= VT_BITFIELD
|
2782 (bit_pos
<< VT_STRUCT_SHIFT
) |
2783 (bit_size
<< (VT_STRUCT_SHIFT
+ 6));
2784 bit_pos
+= bit_size
;
2790 if (v
!= 0 || (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
2791 /* add new memory data only if starting
2793 if (lbit_pos
== 0) {
2794 if (a
== TOK_STRUCT
) {
2795 c
= (c
+ align
- 1) & -align
;
2804 if (align
> maxalign
)
2808 printf("add field %s offset=%d",
2809 get_tok_str(v
, NULL
), offset
);
2810 if (type1
.t
& VT_BITFIELD
) {
2811 printf(" pos=%d size=%d",
2812 (type1
.t
>> VT_STRUCT_SHIFT
) & 0x3f,
2813 (type1
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f);
2818 if (v
== 0 && (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
2820 while ((ass
= ass
->next
) != NULL
) {
2821 ss
= sym_push(ass
->v
, &ass
->type
, 0, offset
+ ass
->c
);
2826 ss
= sym_push(v
| SYM_FIELD
, &type1
, 0, offset
);
2830 if (tok
== ';' || tok
== TOK_EOF
)
2837 /* store size and alignment */
2838 s
->c
= (c
+ maxalign
- 1) & -maxalign
;
2844 /* return 0 if no type declaration. otherwise, return the basic type
2847 static int parse_btype(CType
*type
, AttributeDef
*ad
)
2849 int t
, u
, type_found
, typespec_found
, typedef_found
;
2853 memset(ad
, 0, sizeof(AttributeDef
));
2861 /* currently, we really ignore extension */
2871 if ((t
& VT_BTYPE
) != 0)
2872 tcc_error("too many basic types");
2888 if ((t
& VT_BTYPE
) == VT_DOUBLE
) {
2889 #ifndef TCC_TARGET_PE
2890 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
2892 } else if ((t
& VT_BTYPE
) == VT_LONG
) {
2893 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
2907 if ((t
& VT_BTYPE
) == VT_LONG
) {
2908 #ifdef TCC_TARGET_PE
2909 t
= (t
& ~VT_BTYPE
) | VT_DOUBLE
;
2911 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
2919 struct_decl(&type1
, VT_ENUM
);
2922 type
->ref
= type1
.ref
;
2926 struct_decl(&type1
, VT_STRUCT
);
2929 /* type modifiers */
2982 /* GNUC attribute */
2983 case TOK_ATTRIBUTE1
:
2984 case TOK_ATTRIBUTE2
:
2985 parse_attribute(ad
);
2988 t
= (t
& ~VT_BTYPE
) | u
;
2996 parse_expr_type(&type1
);
2997 /* remove all storage modifiers except typedef */
2998 type1
.t
&= ~(VT_STORAGE
&~VT_TYPEDEF
);
3001 if (typespec_found
|| typedef_found
)
3004 if (!s
|| !(s
->type
.t
& VT_TYPEDEF
))
3007 t
|= (s
->type
.t
& ~VT_TYPEDEF
);
3008 type
->ref
= s
->type
.ref
;
3010 /* get attributes from typedef */
3011 if (0 == ad
->aligned
)
3012 ad
->aligned
= FUNC_ALIGN(s
->r
);
3013 if (0 == ad
->func_call
)
3014 ad
->func_call
= FUNC_CALL(s
->r
);
3015 ad
->packed
|= FUNC_PACKED(s
->r
);
3024 if ((t
& (VT_SIGNED
|VT_UNSIGNED
)) == (VT_SIGNED
|VT_UNSIGNED
))
3025 tcc_error("signed and unsigned modifier");
3026 if (tcc_state
->char_is_unsigned
) {
3027 if ((t
& (VT_SIGNED
|VT_UNSIGNED
|VT_BTYPE
)) == VT_BYTE
)
3032 /* long is never used as type */
3033 if ((t
& VT_BTYPE
) == VT_LONG
)
3034 #if !defined TCC_TARGET_X86_64 || defined TCC_TARGET_PE
3035 t
= (t
& ~VT_BTYPE
) | VT_INT
;
3037 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3043 /* convert a function parameter type (array to pointer and function to
3044 function pointer) */
3045 static inline void convert_parameter_type(CType
*pt
)
3047 /* remove const and volatile qualifiers (XXX: const could be used
3048 to indicate a const function parameter */
3049 pt
->t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3050 /* array must be transformed to pointer according to ANSI C */
3052 if ((pt
->t
& VT_BTYPE
) == VT_FUNC
) {
3057 ST_FUNC
void parse_asm_str(CString
*astr
)
3060 /* read the string */
3062 expect("string constant");
3064 while (tok
== TOK_STR
) {
3065 /* XXX: add \0 handling too ? */
3066 cstr_cat(astr
, tokc
.cstr
->data
);
3069 cstr_ccat(astr
, '\0');
3072 /* Parse an asm label and return the label
3073 * Don't forget to free the CString in the caller! */
3074 static void asm_label_instr(CString
*astr
)
3077 parse_asm_str(astr
);
3080 printf("asm_alias: \"%s\"\n", (char *)astr
->data
);
3084 static void post_type(CType
*type
, AttributeDef
*ad
)
3086 int n
, l
, t1
, arg_size
, align
;
3087 Sym
**plast
, *s
, *first
;
3092 /* function declaration */
3100 /* read param name and compute offset */
3101 if (l
!= FUNC_OLD
) {
3102 if (!parse_btype(&pt
, &ad1
)) {
3104 tcc_error("invalid type");
3111 if ((pt
.t
& VT_BTYPE
) == VT_VOID
&& tok
== ')')
3113 type_decl(&pt
, &ad1
, &n
, TYPE_DIRECT
| TYPE_ABSTRACT
);
3114 if ((pt
.t
& VT_BTYPE
) == VT_VOID
)
3115 tcc_error("parameter declared as void");
3116 arg_size
+= (type_size(&pt
, &align
) + PTR_SIZE
- 1) / PTR_SIZE
;
3121 expect("identifier");
3125 convert_parameter_type(&pt
);
3126 s
= sym_push(n
| SYM_FIELD
, &pt
, 0, 0);
3132 if (l
== FUNC_NEW
&& tok
== TOK_DOTS
) {
3139 /* if no parameters, then old type prototype */
3143 /* NOTE: const is ignored in returned type as it has a special
3144 meaning in gcc / C++ */
3145 type
->t
&= ~VT_CONSTANT
;
3146 /* some ancient pre-K&R C allows a function to return an array
3147 and the array brackets to be put after the arguments, such
3148 that "int c()[]" means something like "int[] c()" */
3151 skip(']'); /* only handle simple "[]" */
3154 /* we push a anonymous symbol which will contain the function prototype */
3155 ad
->func_args
= arg_size
;
3156 s
= sym_push(SYM_FIELD
, type
, INT_ATTR(ad
), l
);
3160 } else if (tok
== '[') {
3161 /* array definition */
3163 if (tok
== TOK_RESTRICT1
)
3168 if (!local_stack
|| nocode_wanted
)
3169 vpushi(expr_const());
3171 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3174 tcc_error("invalid array size");
3176 if (!is_integer_btype(vtop
->type
.t
& VT_BTYPE
))
3177 tcc_error("size of variable length array should be an integer");
3182 /* parse next post type */
3183 post_type(type
, ad
);
3184 t1
|= type
->t
& VT_VLA
;
3187 loc
-= type_size(&int_type
, &align
);
3191 vla_runtime_type_size(type
, &align
);
3193 vset(&int_type
, VT_LOCAL
|VT_LVAL
, loc
);
3200 /* we push an anonymous symbol which will contain the array
3202 s
= sym_push(SYM_FIELD
, type
, 0, n
);
3203 type
->t
= (t1
? VT_VLA
: VT_ARRAY
) | VT_PTR
;
3208 /* Parse a type declaration (except basic type), and return the type
3209 in 'type'. 'td' is a bitmask indicating which kind of type decl is
3210 expected. 'type' should contain the basic type. 'ad' is the
3211 attribute definition of the basic type. It can be modified by
3214 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
)
3217 CType type1
, *type2
;
3218 int qualifiers
, storage
;
3220 while (tok
== '*') {
3228 qualifiers
|= VT_CONSTANT
;
3233 qualifiers
|= VT_VOLATILE
;
3241 type
->t
|= qualifiers
;
3244 /* XXX: clarify attribute handling */
3245 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3246 parse_attribute(ad
);
3248 /* recursive type */
3249 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
3250 type1
.t
= 0; /* XXX: same as int */
3253 /* XXX: this is not correct to modify 'ad' at this point, but
3254 the syntax is not clear */
3255 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3256 parse_attribute(ad
);
3257 type_decl(&type1
, ad
, v
, td
);
3260 /* type identifier */
3261 if (tok
>= TOK_IDENT
&& (td
& TYPE_DIRECT
)) {
3265 if (!(td
& TYPE_ABSTRACT
))
3266 expect("identifier");
3270 storage
= type
->t
& VT_STORAGE
;
3271 type
->t
&= ~VT_STORAGE
;
3272 post_type(type
, ad
);
3274 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3275 parse_attribute(ad
);
3279 /* append type at the end of type1 */
3292 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
3293 ST_FUNC
int lvalue_type(int t
)
3298 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
3300 else if (bt
== VT_SHORT
)
3304 if (t
& VT_UNSIGNED
)
3305 r
|= VT_LVAL_UNSIGNED
;
3309 /* indirection with full error checking and bound check */
3310 ST_FUNC
void indir(void)
3312 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
) {
3313 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FUNC
)
3317 if ((vtop
->r
& VT_LVAL
) && !nocode_wanted
)
3319 vtop
->type
= *pointed_type(&vtop
->type
);
3320 /* Arrays and functions are never lvalues */
3321 if (!(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_VLA
)
3322 && (vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
3323 vtop
->r
|= lvalue_type(vtop
->type
.t
);
3324 /* if bound checking, the referenced pointer must be checked */
3325 #ifdef CONFIG_TCC_BCHECK
3326 if (tcc_state
->do_bounds_check
)
3327 vtop
->r
|= VT_MUSTBOUND
;
3332 /* pass a parameter to a function and do type checking and casting */
3333 static void gfunc_param_typed(Sym
*func
, Sym
*arg
)
3338 func_type
= func
->c
;
3339 if (func_type
== FUNC_OLD
||
3340 (func_type
== FUNC_ELLIPSIS
&& arg
== NULL
)) {
3341 /* default casting : only need to convert float to double */
3342 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
) {
3346 } else if (arg
== NULL
) {
3347 tcc_error("too many arguments to function");
3350 type
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
3351 gen_assign_cast(&type
);
3355 /* parse an expression of the form '(type)' or '(expr)' and return its
3357 static void parse_expr_type(CType
*type
)
3363 if (parse_btype(type
, &ad
)) {
3364 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3371 static void parse_type(CType
*type
)
3376 if (!parse_btype(type
, &ad
)) {
3379 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3382 static void vpush_tokc(int t
)
3387 vsetc(&type
, VT_CONST
, &tokc
);
3390 ST_FUNC
void unary(void)
3392 int n
, t
, align
, size
, r
, sizeof_caller
;
3396 static int in_sizeof
= 0;
3398 sizeof_caller
= in_sizeof
;
3400 /* XXX: GCC 2.95.3 does not generate a table although it should be
3414 vpush_tokc(VT_INT
| VT_UNSIGNED
);
3418 vpush_tokc(VT_LLONG
);
3422 vpush_tokc(VT_LLONG
| VT_UNSIGNED
);
3426 vpush_tokc(VT_FLOAT
);
3430 vpush_tokc(VT_DOUBLE
);
3434 vpush_tokc(VT_LDOUBLE
);
3437 case TOK___FUNCTION__
:
3439 goto tok_identifier
;
3445 /* special function name identifier */
3446 len
= strlen(funcname
) + 1;
3447 /* generate char[len] type */
3452 vpush_ref(&type
, data_section
, data_section
->data_offset
, len
);
3453 ptr
= section_ptr_add(data_section
, len
);
3454 memcpy(ptr
, funcname
, len
);
3459 #ifdef TCC_TARGET_PE
3460 t
= VT_SHORT
| VT_UNSIGNED
;
3466 /* string parsing */
3469 if (tcc_state
->warn_write_strings
)
3474 memset(&ad
, 0, sizeof(AttributeDef
));
3475 decl_initializer_alloc(&type
, &ad
, VT_CONST
, 2, 0, NULL
, 0);
3480 if (parse_btype(&type
, &ad
)) {
3481 type_decl(&type
, &ad
, &n
, TYPE_ABSTRACT
);
3483 /* check ISOC99 compound literal */
3485 /* data is allocated locally by default */
3490 /* all except arrays are lvalues */
3491 if (!(type
.t
& VT_ARRAY
))
3492 r
|= lvalue_type(type
.t
);
3493 memset(&ad
, 0, sizeof(AttributeDef
));
3494 decl_initializer_alloc(&type
, &ad
, r
, 1, 0, NULL
, 0);
3496 if (sizeof_caller
) {
3503 } else if (tok
== '{') {
3504 /* save all registers */
3506 /* statement expression : we do not accept break/continue
3507 inside as GCC does */
3508 block(NULL
, NULL
, NULL
, NULL
, 0, 1);
3523 /* functions names must be treated as function pointers,
3524 except for unary '&' and sizeof. Since we consider that
3525 functions are not lvalues, we only have to handle it
3526 there and in function calls. */
3527 /* arrays can also be used although they are not lvalues */
3528 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
&&
3529 !(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_LLOCAL
))
3531 mk_pointer(&vtop
->type
);
3537 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3539 boolean
.t
= VT_BOOL
;
3541 vtop
->c
.i
= !vtop
->c
.i
;
3542 } else if ((vtop
->r
& VT_VALMASK
) == VT_CMP
)
3543 vtop
->c
.i
= vtop
->c
.i
^ 1;
3546 vseti(VT_JMP
, gtst(1, 0));
3557 /* in order to force cast, we add zero */
3559 if ((vtop
->type
.t
& VT_BTYPE
) == VT_PTR
)
3560 tcc_error("pointer not accepted for unary plus");
3570 unary_type(&type
); // Perform a in_sizeof = 0;
3571 size
= type_size(&type
, &align
);
3572 if (t
== TOK_SIZEOF
) {
3573 if (!(type
.t
& VT_VLA
)) {
3575 tcc_error("sizeof applied to an incomplete type");
3578 vla_runtime_type_size(&type
, &align
);
3583 vtop
->type
.t
|= VT_UNSIGNED
;
3586 case TOK_builtin_types_compatible_p
:
3595 type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3596 type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3597 vpushi(is_compatible_types(&type1
, &type2
));
3600 case TOK_builtin_constant_p
:
3602 int saved_nocode_wanted
, res
;
3605 saved_nocode_wanted
= nocode_wanted
;
3608 res
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
3610 nocode_wanted
= saved_nocode_wanted
;
3615 case TOK_builtin_frame_address
:
3620 if (tok
!= TOK_CINT
) {
3621 tcc_error("__builtin_frame_address only takes integers");
3624 tcc_error("TCC only supports __builtin_frame_address(0)");
3630 vset(&type
, VT_LOCAL
, 0);
3633 #ifdef TCC_TARGET_X86_64
3634 case TOK_builtin_va_arg_types
:
3636 /* This definition must be synced with stdarg.h */
3637 enum __va_arg_type
{
3638 __va_gen_reg
, __va_float_reg
, __va_stack
3646 bt
= type
.t
& VT_BTYPE
;
3647 if (bt
== VT_STRUCT
|| bt
== VT_LDOUBLE
) {
3649 } else if (bt
== VT_FLOAT
|| bt
== VT_DOUBLE
) {
3650 vpushi(__va_float_reg
);
3652 vpushi(__va_gen_reg
);
3672 goto tok_identifier
;
3674 /* allow to take the address of a label */
3675 if (tok
< TOK_UIDENT
)
3676 expect("label identifier");
3677 s
= label_find(tok
);
3679 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
3681 if (s
->r
== LABEL_DECLARED
)
3682 s
->r
= LABEL_FORWARD
;
3685 s
->type
.t
= VT_VOID
;
3686 mk_pointer(&s
->type
);
3687 s
->type
.t
|= VT_STATIC
;
3689 vset(&s
->type
, VT_CONST
| VT_SYM
, 0);
3694 // special qnan , snan and infinity values
3696 vpush64(VT_DOUBLE
, 0x7ff8000000000000ULL
);
3700 vpush64(VT_DOUBLE
, 0x7ff0000000000001ULL
);
3704 vpush64(VT_DOUBLE
, 0x7ff0000000000000ULL
);
3713 expect("identifier");
3717 tcc_error("'%s' undeclared", get_tok_str(t
, NULL
));
3718 /* for simple function calls, we tolerate undeclared
3719 external reference to int() function */
3720 if (tcc_state
->warn_implicit_function_declaration
)
3721 tcc_warning("implicit declaration of function '%s'",
3722 get_tok_str(t
, NULL
));
3723 s
= external_global_sym(t
, &func_old_type
, 0);
3725 if ((s
->type
.t
& (VT_STATIC
| VT_INLINE
| VT_BTYPE
)) ==
3726 (VT_STATIC
| VT_INLINE
| VT_FUNC
)) {
3727 /* if referencing an inline function, then we generate a
3728 symbol to it if not already done. It will have the
3729 effect to generate code for it at the end of the
3730 compilation unit. Inline function as always
3731 generated in the text section. */
3733 put_extern_sym(s
, text_section
, 0, 0);
3734 r
= VT_SYM
| VT_CONST
;
3738 vset(&s
->type
, r
, s
->c
);
3739 /* if forward reference, we must point to s */
3740 if (vtop
->r
& VT_SYM
) {
3747 /* post operations */
3749 if (tok
== TOK_INC
|| tok
== TOK_DEC
) {
3752 } else if (tok
== '.' || tok
== TOK_ARROW
) {
3755 if (tok
== TOK_ARROW
)
3757 qualifiers
= vtop
->type
.t
& (VT_CONSTANT
| VT_VOLATILE
);
3761 /* expect pointer on structure */
3762 if ((vtop
->type
.t
& VT_BTYPE
) != VT_STRUCT
)
3763 expect("struct or union");
3767 while ((s
= s
->next
) != NULL
) {
3772 tcc_error("field not found: %s", get_tok_str(tok
& ~SYM_FIELD
, NULL
));
3773 /* add field offset to pointer */
3774 vtop
->type
= char_pointer_type
; /* change type to 'char *' */
3777 /* change type to field type, and set to lvalue */
3778 vtop
->type
= s
->type
;
3779 vtop
->type
.t
|= qualifiers
;
3780 /* an array is never an lvalue */
3781 if (!(vtop
->type
.t
& VT_ARRAY
)) {
3782 vtop
->r
|= lvalue_type(vtop
->type
.t
);
3783 #ifdef CONFIG_TCC_BCHECK
3784 /* if bound checking, the referenced pointer must be checked */
3785 if (tcc_state
->do_bounds_check
)
3786 vtop
->r
|= VT_MUSTBOUND
;
3790 } else if (tok
== '[') {
3796 } else if (tok
== '(') {
3802 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
3803 /* pointer test (no array accepted) */
3804 if ((vtop
->type
.t
& (VT_BTYPE
| VT_ARRAY
)) == VT_PTR
) {
3805 vtop
->type
= *pointed_type(&vtop
->type
);
3806 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
)
3810 expect("function pointer");
3813 vtop
->r
&= ~VT_LVAL
; /* no lvalue */
3815 /* get return type */
3818 sa
= s
->next
; /* first parameter */
3821 /* compute first implicit argument if a structure is returned */
3822 if ((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
3823 /* get some space for the returned structure */
3824 size
= type_size(&s
->type
, &align
);
3825 loc
= (loc
- size
) & -align
;
3827 ret
.r
= VT_LOCAL
| VT_LVAL
;
3828 /* pass it as 'int' to avoid structure arg passing
3830 vseti(VT_LOCAL
, loc
);
3835 /* return in register */
3836 if (is_float(ret
.type
.t
)) {
3837 ret
.r
= reg_fret(ret
.type
.t
);
3839 if ((ret
.type
.t
& VT_BTYPE
) == VT_LLONG
)
3848 gfunc_param_typed(s
, sa
);
3858 tcc_error("too few arguments to function");
3860 if (!nocode_wanted
) {
3861 gfunc_call(nb_args
);
3863 vtop
-= (nb_args
+ 1);
3866 vsetc(&ret
.type
, ret
.r
, &ret
.c
);
3874 ST_FUNC
void expr_prod(void)
3879 while (tok
== '*' || tok
== '/' || tok
== '%') {
3887 ST_FUNC
void expr_sum(void)
3892 while (tok
== '+' || tok
== '-') {
3900 static void expr_shift(void)
3905 while (tok
== TOK_SHL
|| tok
== TOK_SAR
) {
3913 static void expr_cmp(void)
3918 while ((tok
>= TOK_ULE
&& tok
<= TOK_GT
) ||
3919 tok
== TOK_ULT
|| tok
== TOK_UGE
) {
3927 static void expr_cmpeq(void)
3932 while (tok
== TOK_EQ
|| tok
== TOK_NE
) {
3940 static void expr_and(void)
3943 while (tok
== '&') {
3950 static void expr_xor(void)
3953 while (tok
== '^') {
3960 static void expr_or(void)
3963 while (tok
== '|') {
3970 /* XXX: fix this mess */
3971 static void expr_land_const(void)
3974 while (tok
== TOK_LAND
) {
3981 /* XXX: fix this mess */
3982 static void expr_lor_const(void)
3985 while (tok
== TOK_LOR
) {
3992 /* only used if non constant */
3993 static void expr_land(void)
3998 if (tok
== TOK_LAND
) {
4003 if (tok
!= TOK_LAND
) {
4013 static void expr_lor(void)
4018 if (tok
== TOK_LOR
) {
4023 if (tok
!= TOK_LOR
) {
4033 /* XXX: better constant handling */
4034 static void expr_cond(void)
4036 int tt
, u
, r1
, r2
, rc
, t1
, t2
, bt1
, bt2
;
4038 CType type
, type1
, type2
;
4045 boolean
.t
= VT_BOOL
;
4051 if (tok
!= ':' || !gnu_ext
) {
4066 if (vtop
!= vstack
) {
4067 /* needed to avoid having different registers saved in
4069 if (is_float(vtop
->type
.t
)) {
4071 #ifdef TCC_TARGET_X86_64
4072 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4082 if (tok
== ':' && gnu_ext
) {
4090 sv
= *vtop
; /* save value to handle it later */
4091 vtop
--; /* no vpop so that FP stack is not flushed */
4099 bt1
= t1
& VT_BTYPE
;
4101 bt2
= t2
& VT_BTYPE
;
4102 /* cast operands to correct type according to ISOC rules */
4103 if (is_float(bt1
) || is_float(bt2
)) {
4104 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
4105 type
.t
= VT_LDOUBLE
;
4106 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
4111 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
4112 /* cast to biggest op */
4114 /* convert to unsigned if it does not fit in a long long */
4115 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
4116 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
4117 type
.t
|= VT_UNSIGNED
;
4118 } else if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
4119 /* XXX: test pointer compatibility */
4121 } else if (bt1
== VT_FUNC
|| bt2
== VT_FUNC
) {
4122 /* XXX: test function pointer compatibility */
4124 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
4125 /* XXX: test structure compatibility */
4127 } else if (bt1
== VT_VOID
|| bt2
== VT_VOID
) {
4128 /* NOTE: as an extension, we accept void on only one side */
4131 /* integer operations */
4133 /* convert to unsigned if it does not fit in an integer */
4134 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
4135 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
4136 type
.t
|= VT_UNSIGNED
;
4139 /* now we convert second operand */
4141 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4144 if (is_float(type
.t
)) {
4146 #ifdef TCC_TARGET_X86_64
4147 if ((type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4151 } else if ((type
.t
& VT_BTYPE
) == VT_LLONG
) {
4152 /* for long longs, we use fixed registers to avoid having
4153 to handle a complicated move */
4158 /* this is horrible, but we must also convert first
4162 /* put again first value and cast it */
4165 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4175 static void expr_eq(void)
4181 (tok
>= TOK_A_MOD
&& tok
<= TOK_A_DIV
) ||
4182 tok
== TOK_A_XOR
|| tok
== TOK_A_OR
||
4183 tok
== TOK_A_SHL
|| tok
== TOK_A_SAR
) {
4198 ST_FUNC
void gexpr(void)
4209 /* parse an expression and return its type without any side effect. */
4210 static void expr_type(CType
*type
)
4212 int saved_nocode_wanted
;
4214 saved_nocode_wanted
= nocode_wanted
;
4219 nocode_wanted
= saved_nocode_wanted
;
4222 /* parse a unary expression and return its type without any side
4224 static void unary_type(CType
*type
)
4236 /* parse a constant expression and return value in vtop. */
4237 static void expr_const1(void)
4246 /* parse an integer constant and return its value. */
4247 ST_FUNC
int expr_const(void)
4251 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
4252 expect("constant expression");
4258 /* return the label token if current token is a label, otherwise
4260 static int is_label(void)
4264 /* fast test first */
4265 if (tok
< TOK_UIDENT
)
4267 /* no need to save tokc because tok is an identifier */
4274 unget_tok(last_tok
);
4279 static void block(int *bsym
, int *csym
, int *case_sym
, int *def_sym
,
4280 int case_reg
, int is_expr
)
4285 /* generate line number info */
4286 if (tcc_state
->do_debug
&&
4287 (last_line_num
!= file
->line_num
|| last_ind
!= ind
)) {
4288 put_stabn(N_SLINE
, 0, file
->line_num
, ind
- func_ind
);
4290 last_line_num
= file
->line_num
;
4294 /* default return value is (void) */
4296 vtop
->type
.t
= VT_VOID
;
4299 if (tok
== TOK_IF
) {
4306 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4308 if (c
== TOK_ELSE
) {
4312 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4313 gsym(d
); /* patch else jmp */
4316 } else if (tok
== TOK_WHILE
) {
4324 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4328 } else if (tok
== '{') {
4332 /* record local declaration stack position */
4334 llabel
= local_label_stack
;
4335 /* handle local labels declarations */
4336 if (tok
== TOK_LABEL
) {
4339 if (tok
< TOK_UIDENT
)
4340 expect("label identifier");
4341 label_push(&local_label_stack
, tok
, LABEL_DECLARED
);
4351 while (tok
!= '}') {
4356 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
4359 /* pop locally defined labels */
4360 label_pop(&local_label_stack
, llabel
);
4362 /* XXX: this solution makes only valgrind happy...
4363 triggered by gcc.c-torture/execute/20000917-1.c */
4365 switch(vtop
->type
.t
& VT_BTYPE
) {
4370 for(p
=vtop
->type
.ref
;p
;p
=p
->prev
)
4372 tcc_error("unsupported expression type");
4375 /* pop locally defined symbols */
4376 sym_pop(&local_stack
, s
);
4378 } else if (tok
== TOK_RETURN
) {
4382 gen_assign_cast(&func_vt
);
4383 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
4385 /* if returning structure, must copy it to implicit
4386 first pointer arg location */
4389 size
= type_size(&func_vt
,&align
);
4392 if((vtop
->r
!= (VT_LOCAL
| VT_LVAL
) || (vtop
->c
.i
& 3))
4396 loc
= (loc
- size
) & -4;
4399 vset(&type
, VT_LOCAL
| VT_LVAL
, addr
);
4402 vset(&int_type
, VT_LOCAL
| VT_LVAL
, addr
);
4404 vtop
->type
= int_type
;
4410 vset(&type
, VT_LOCAL
| VT_LVAL
, func_vc
);
4413 /* copy structure value to pointer */
4418 } else if (is_float(func_vt
.t
)) {
4419 gv(rc_fret(func_vt
.t
));
4423 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
4426 rsym
= gjmp(rsym
); /* jmp */
4427 } else if (tok
== TOK_BREAK
) {
4430 tcc_error("cannot break");
4431 *bsym
= gjmp(*bsym
);
4434 } else if (tok
== TOK_CONTINUE
) {
4437 tcc_error("cannot continue");
4438 *csym
= gjmp(*csym
);
4441 } else if (tok
== TOK_FOR
) {
4447 /* c99 for-loop init decl? */
4448 if (!decl0(VT_LOCAL
, 1)) {
4449 /* no, regular for-loop init expr */
4473 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4477 sym_pop(&local_stack
, s
);
4479 if (tok
== TOK_DO
) {
4484 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4495 if (tok
== TOK_SWITCH
) {
4499 /* XXX: other types than integer */
4500 case_reg
= gv(RC_INT
);
4504 b
= gjmp(0); /* jump to first case */
4506 block(&a
, csym
, &b
, &c
, case_reg
, 0);
4507 /* if no default, jmp after switch */
4515 if (tok
== TOK_CASE
) {
4522 if (gnu_ext
&& tok
== TOK_DOTS
) {
4526 tcc_warning("empty case range");
4528 /* since a case is like a label, we must skip it with a jmp */
4535 *case_sym
= gtst(1, 0);
4538 *case_sym
= gtst(1, 0);
4542 *case_sym
= gtst(1, *case_sym
);
4547 goto block_after_label
;
4549 if (tok
== TOK_DEFAULT
) {
4555 tcc_error("too many 'default'");
4558 goto block_after_label
;
4560 if (tok
== TOK_GOTO
) {
4562 if (tok
== '*' && gnu_ext
) {
4566 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
)
4569 } else if (tok
>= TOK_UIDENT
) {
4570 s
= label_find(tok
);
4571 /* put forward definition if needed */
4573 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
4575 if (s
->r
== LABEL_DECLARED
)
4576 s
->r
= LABEL_FORWARD
;
4578 /* label already defined */
4579 if (s
->r
& LABEL_FORWARD
)
4580 s
->jnext
= gjmp(s
->jnext
);
4582 gjmp_addr(s
->jnext
);
4585 expect("label identifier");
4588 } else if (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
) {
4596 if (s
->r
== LABEL_DEFINED
)
4597 tcc_error("duplicate label '%s'", get_tok_str(s
->v
, NULL
));
4599 s
->r
= LABEL_DEFINED
;
4601 s
= label_push(&global_label_stack
, b
, LABEL_DEFINED
);
4604 /* we accept this, but it is a mistake */
4607 tcc_warning("deprecated use of label at end of compound statement");
4611 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
4614 /* expression case */
4629 /* t is the array or struct type. c is the array or struct
4630 address. cur_index/cur_field is the pointer to the current
4631 value. 'size_only' is true if only size info is needed (only used
4633 static void decl_designator(CType
*type
, Section
*sec
, unsigned long c
,
4634 int *cur_index
, Sym
**cur_field
,
4638 int notfirst
, index
, index_last
, align
, l
, nb_elems
, elem_size
;
4644 if (gnu_ext
&& (l
= is_label()) != 0)
4646 while (tok
== '[' || tok
== '.') {
4648 if (!(type
->t
& VT_ARRAY
))
4649 expect("array type");
4652 index
= expr_const();
4653 if (index
< 0 || (s
->c
>= 0 && index
>= s
->c
))
4654 expect("invalid index");
4655 if (tok
== TOK_DOTS
&& gnu_ext
) {
4657 index_last
= expr_const();
4658 if (index_last
< 0 ||
4659 (s
->c
>= 0 && index_last
>= s
->c
) ||
4661 expect("invalid index");
4667 *cur_index
= index_last
;
4668 type
= pointed_type(type
);
4669 elem_size
= type_size(type
, &align
);
4670 c
+= index
* elem_size
;
4671 /* NOTE: we only support ranges for last designator */
4672 nb_elems
= index_last
- index
+ 1;
4673 if (nb_elems
!= 1) {
4682 if ((type
->t
& VT_BTYPE
) != VT_STRUCT
)
4683 expect("struct/union type");
4696 /* XXX: fix this mess by using explicit storage field */
4698 type1
.t
|= (type
->t
& ~VT_TYPE
);
4712 if (type
->t
& VT_ARRAY
) {
4714 type
= pointed_type(type
);
4715 c
+= index
* type_size(type
, &align
);
4719 tcc_error("too many field init");
4720 /* XXX: fix this mess by using explicit storage field */
4722 type1
.t
|= (type
->t
& ~VT_TYPE
);
4727 decl_initializer(type
, sec
, c
, 0, size_only
);
4729 /* XXX: make it more general */
4730 if (!size_only
&& nb_elems
> 1) {
4731 unsigned long c_end
;
4736 tcc_error("range init not supported yet for dynamic storage");
4737 c_end
= c
+ nb_elems
* elem_size
;
4738 if (c_end
> sec
->data_allocated
)
4739 section_realloc(sec
, c_end
);
4740 src
= sec
->data
+ c
;
4742 for(i
= 1; i
< nb_elems
; i
++) {
4744 memcpy(dst
, src
, elem_size
);
4750 #define EXPR_CONST 1
4753 /* store a value or an expression directly in global data or in local array */
4754 static void init_putv(CType
*type
, Section
*sec
, unsigned long c
,
4755 int v
, int expr_type
)
4757 int saved_global_expr
, bt
, bit_pos
, bit_size
;
4759 unsigned long long bit_mask
;
4767 /* compound literals must be allocated globally in this case */
4768 saved_global_expr
= global_expr
;
4771 global_expr
= saved_global_expr
;
4772 /* NOTE: symbols are accepted */
4773 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) != VT_CONST
)
4774 tcc_error("initializer element is not constant");
4782 dtype
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
4785 /* XXX: not portable */
4786 /* XXX: generate error if incorrect relocation */
4787 gen_assign_cast(&dtype
);
4788 bt
= type
->t
& VT_BTYPE
;
4789 /* we'll write at most 12 bytes */
4790 if (c
+ 12 > sec
->data_allocated
) {
4791 section_realloc(sec
, c
+ 12);
4793 ptr
= sec
->data
+ c
;
4794 /* XXX: make code faster ? */
4795 if (!(type
->t
& VT_BITFIELD
)) {
4800 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
4801 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
4802 bit_mask
= (1LL << bit_size
) - 1;
4804 if ((vtop
->r
& VT_SYM
) &&
4810 (bt
== VT_INT
&& bit_size
!= 32)))
4811 tcc_error("initializer element is not computable at load time");
4814 vtop
->c
.i
= (vtop
->c
.i
!= 0);
4816 *(char *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
4819 *(short *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
4822 *(double *)ptr
= vtop
->c
.d
;
4825 *(long double *)ptr
= vtop
->c
.ld
;
4828 *(long long *)ptr
|= (vtop
->c
.ll
& bit_mask
) << bit_pos
;
4831 if (vtop
->r
& VT_SYM
) {
4832 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
4834 *(int *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
4839 vset(&dtype
, VT_LOCAL
|VT_LVAL
, c
);
4846 /* put zeros for variable based init */
4847 static void init_putz(CType
*t
, Section
*sec
, unsigned long c
, int size
)
4850 /* nothing to do because globals are already set to zero */
4852 vpush_global_sym(&func_old_type
, TOK_memset
);
4860 /* 't' contains the type and storage info. 'c' is the offset of the
4861 object in section 'sec'. If 'sec' is NULL, it means stack based
4862 allocation. 'first' is true if array '{' must be read (multi
4863 dimension implicit array init handling). 'size_only' is true if
4864 size only evaluation is wanted (only for arrays). */
4865 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
,
4866 int first
, int size_only
)
4868 int index
, array_length
, n
, no_oblock
, nb
, parlevel
, parlevel1
, i
;
4869 int size1
, align1
, expr_type
;
4873 if (type
->t
& VT_VLA
) {
4874 #if defined TCC_TARGET_I386 || defined TCC_TARGET_X86_64
4878 vpush_global_sym(&func_old_type
, TOK_alloca
);
4879 vla_runtime_type_size(type
, &a
);
4884 vsetc(type
, REG_IRET
, &retcval
);
4885 vset(type
, VT_LOCAL
|VT_LVAL
, c
);
4890 tcc_error("variable length arrays unsupported for this target");
4892 } else if (type
->t
& VT_ARRAY
) {
4896 t1
= pointed_type(type
);
4897 size1
= type_size(t1
, &align1
);
4900 if ((first
&& tok
!= TOK_LSTR
&& tok
!= TOK_STR
) ||
4903 tcc_error("character array initializer must be a literal,"
4904 " optionally enclosed in braces");
4909 /* only parse strings here if correct type (otherwise: handle
4910 them as ((w)char *) expressions */
4911 if ((tok
== TOK_LSTR
&&
4912 #ifdef TCC_TARGET_PE
4913 (t1
->t
& VT_BTYPE
) == VT_SHORT
&& (t1
->t
& VT_UNSIGNED
)
4915 (t1
->t
& VT_BTYPE
) == VT_INT
4917 ) || (tok
== TOK_STR
&& (t1
->t
& VT_BTYPE
) == VT_BYTE
)) {
4918 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
4923 /* compute maximum number of chars wanted */
4925 cstr_len
= cstr
->size
;
4927 cstr_len
= cstr
->size
/ sizeof(nwchar_t
);
4930 if (n
>= 0 && nb
> (n
- array_length
))
4931 nb
= n
- array_length
;
4934 tcc_warning("initializer-string for array is too long");
4935 /* in order to go faster for common case (char
4936 string in global variable, we handle it
4938 if (sec
&& tok
== TOK_STR
&& size1
== 1) {
4939 memcpy(sec
->data
+ c
+ array_length
, cstr
->data
, nb
);
4943 ch
= ((unsigned char *)cstr
->data
)[i
];
4945 ch
= ((nwchar_t
*)cstr
->data
)[i
];
4946 init_putv(t1
, sec
, c
+ (array_length
+ i
) * size1
,
4954 /* only add trailing zero if enough storage (no
4955 warning in this case since it is standard) */
4956 if (n
< 0 || array_length
< n
) {
4958 init_putv(t1
, sec
, c
+ (array_length
* size1
), 0, EXPR_VAL
);
4964 while (tok
!= '}') {
4965 decl_designator(type
, sec
, c
, &index
, NULL
, size_only
);
4966 if (n
>= 0 && index
>= n
)
4967 tcc_error("index too large");
4968 /* must put zero in holes (note that doing it that way
4969 ensures that it even works with designators) */
4970 if (!size_only
&& array_length
< index
) {
4971 init_putz(t1
, sec
, c
+ array_length
* size1
,
4972 (index
- array_length
) * size1
);
4975 if (index
> array_length
)
4976 array_length
= index
;
4977 /* special test for multi dimensional arrays (may not
4978 be strictly correct if designators are used at the
4980 if (index
>= n
&& no_oblock
)
4989 /* put zeros at the end */
4990 if (!size_only
&& n
>= 0 && array_length
< n
) {
4991 init_putz(t1
, sec
, c
+ array_length
* size1
,
4992 (n
- array_length
) * size1
);
4994 /* patch type size if needed */
4996 s
->c
= array_length
;
4997 } else if ((type
->t
& VT_BTYPE
) == VT_STRUCT
&&
4998 (sec
|| !first
|| tok
== '{')) {
5001 /* NOTE: the previous test is a specific case for automatic
5002 struct/union init */
5003 /* XXX: union needs only one init */
5005 /* XXX: this test is incorrect for local initializers
5006 beginning with ( without {. It would be much more difficult
5007 to do it correctly (ideally, the expression parser should
5008 be used in all cases) */
5014 while (tok
== '(') {
5018 if (!parse_btype(&type1
, &ad1
))
5020 type_decl(&type1
, &ad1
, &n
, TYPE_ABSTRACT
);
5022 if (!is_assignable_types(type
, &type1
))
5023 tcc_error("invalid type for cast");
5028 if (first
|| tok
== '{') {
5037 while (tok
!= '}') {
5038 decl_designator(type
, sec
, c
, NULL
, &f
, size_only
);
5040 if (!size_only
&& array_length
< index
) {
5041 init_putz(type
, sec
, c
+ array_length
,
5042 index
- array_length
);
5044 index
= index
+ type_size(&f
->type
, &align1
);
5045 if (index
> array_length
)
5046 array_length
= index
;
5048 /* gr: skip fields from same union - ugly. */
5050 ///printf("index: %2d %08x -- %2d %08x\n", f->c, f->type.t, f->next->c, f->next->type.t);
5051 /* test for same offset */
5052 if (f
->next
->c
!= f
->c
)
5054 /* if yes, test for bitfield shift */
5055 if ((f
->type
.t
& VT_BITFIELD
) && (f
->next
->type
.t
& VT_BITFIELD
)) {
5056 int bit_pos_1
= (f
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5057 int bit_pos_2
= (f
->next
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5058 //printf("bitfield %d %d\n", bit_pos_1, bit_pos_2);
5059 if (bit_pos_1
!= bit_pos_2
)
5066 if (no_oblock
&& f
== NULL
)
5072 /* put zeros at the end */
5073 if (!size_only
&& array_length
< n
) {
5074 init_putz(type
, sec
, c
+ array_length
,
5083 } else if (tok
== '{') {
5085 decl_initializer(type
, sec
, c
, first
, size_only
);
5087 } else if (size_only
) {
5088 /* just skip expression */
5089 parlevel
= parlevel1
= 0;
5090 while ((parlevel
> 0 || parlevel1
> 0 ||
5091 (tok
!= '}' && tok
!= ',')) && tok
!= -1) {
5094 else if (tok
== ')')
5096 else if (tok
== '{')
5098 else if (tok
== '}')
5103 /* currently, we always use constant expression for globals
5104 (may change for scripting case) */
5105 expr_type
= EXPR_CONST
;
5107 expr_type
= EXPR_ANY
;
5108 init_putv(type
, sec
, c
, 0, expr_type
);
5112 /* parse an initializer for type 't' if 'has_init' is non zero, and
5113 allocate space in local or global data space ('r' is either
5114 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
5115 variable 'v' with an associated name represented by 'asm_label' of
5116 scope 'scope' is declared before initializers are parsed. If 'v' is
5117 zero, then a reference to the new object is put in the value stack.
5118 If 'has_init' is 2, a special parsing is done to handle string
5120 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
,
5121 int has_init
, int v
, char *asm_label
,
5124 int size
, align
, addr
, data_offset
;
5126 ParseState saved_parse_state
= {0};
5127 TokenString init_str
;
5129 Sym
*flexible_array
;
5131 flexible_array
= NULL
;
5132 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
5135 while (field
&& field
->next
)
5136 field
= field
->next
;
5137 if (field
->type
.t
& VT_ARRAY
&& field
->type
.ref
->c
< 0)
5138 flexible_array
= field
;
5141 size
= type_size(type
, &align
);
5142 /* If unknown size, we must evaluate it before
5143 evaluating initializers because
5144 initializers can generate global data too
5145 (e.g. string pointers or ISOC99 compound
5146 literals). It also simplifies local
5147 initializers handling */
5148 tok_str_new(&init_str
);
5149 if (size
< 0 || (flexible_array
&& has_init
)) {
5151 tcc_error("unknown type size");
5152 /* get all init string */
5153 if (has_init
== 2) {
5154 /* only get strings */
5155 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5156 tok_str_add_tok(&init_str
);
5161 while (level
> 0 || (tok
!= ',' && tok
!= ';')) {
5163 tcc_error("unexpected end of file in initializer");
5164 tok_str_add_tok(&init_str
);
5167 else if (tok
== '}') {
5177 tok_str_add(&init_str
, -1);
5178 tok_str_add(&init_str
, 0);
5181 save_parse_state(&saved_parse_state
);
5183 macro_ptr
= init_str
.str
;
5185 decl_initializer(type
, NULL
, 0, 1, 1);
5186 /* prepare second initializer parsing */
5187 macro_ptr
= init_str
.str
;
5190 /* if still unknown size, error */
5191 size
= type_size(type
, &align
);
5193 tcc_error("unknown type size");
5196 size
+= flexible_array
->type
.ref
->c
* pointed_size(&flexible_array
->type
);
5197 /* take into account specified alignment if bigger */
5199 if (ad
->aligned
> align
)
5200 align
= ad
->aligned
;
5201 } else if (ad
->packed
) {
5204 if ((r
& VT_VALMASK
) == VT_LOCAL
) {
5206 #ifdef CONFIG_TCC_BCHECK
5207 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5211 loc
= (loc
- size
) & -align
;
5213 #ifdef CONFIG_TCC_BCHECK
5214 /* handles bounds */
5215 /* XXX: currently, since we do only one pass, we cannot track
5216 '&' operators, so we add only arrays */
5217 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5218 unsigned long *bounds_ptr
;
5219 /* add padding between regions */
5221 /* then add local bound info */
5222 bounds_ptr
= section_ptr_add(lbounds_section
, 2 * sizeof(unsigned long));
5223 bounds_ptr
[0] = addr
;
5224 bounds_ptr
[1] = size
;
5228 /* local variable */
5229 sym_push(v
, type
, r
, addr
);
5231 /* push local reference */
5232 vset(type
, r
, addr
);
5238 if (v
&& scope
== VT_CONST
) {
5239 /* see if the symbol was already defined */
5242 if (!is_compatible_types(&sym
->type
, type
))
5243 tcc_error("incompatible types for redefinition of '%s'",
5244 get_tok_str(v
, NULL
));
5245 if (sym
->type
.t
& VT_EXTERN
) {
5246 /* if the variable is extern, it was not allocated */
5247 sym
->type
.t
&= ~VT_EXTERN
;
5248 /* set array size if it was ommited in extern
5250 if ((sym
->type
.t
& VT_ARRAY
) &&
5251 sym
->type
.ref
->c
< 0 &&
5253 sym
->type
.ref
->c
= type
->ref
->c
;
5255 /* we accept several definitions of the same
5256 global variable. this is tricky, because we
5257 must play with the SHN_COMMON type of the symbol */
5258 /* XXX: should check if the variable was already
5259 initialized. It is incorrect to initialized it
5261 /* no init data, we won't add more to the symbol */
5268 /* allocate symbol in corresponding section */
5273 else if (tcc_state
->nocommon
)
5277 data_offset
= sec
->data_offset
;
5278 data_offset
= (data_offset
+ align
- 1) & -align
;
5280 /* very important to increment global pointer at this time
5281 because initializers themselves can create new initializers */
5282 data_offset
+= size
;
5283 #ifdef CONFIG_TCC_BCHECK
5284 /* add padding if bound check */
5285 if (tcc_state
->do_bounds_check
)
5288 sec
->data_offset
= data_offset
;
5289 /* allocate section space to put the data */
5290 if (sec
->sh_type
!= SHT_NOBITS
&&
5291 data_offset
> sec
->data_allocated
)
5292 section_realloc(sec
, data_offset
);
5293 /* align section if needed */
5294 if (align
> sec
->sh_addralign
)
5295 sec
->sh_addralign
= align
;
5297 addr
= 0; /* avoid warning */
5301 if (scope
!= VT_CONST
|| !sym
) {
5302 sym
= sym_push(v
, type
, r
| VT_SYM
, 0);
5303 sym
->asm_label
= asm_label
;
5305 /* update symbol definition */
5307 put_extern_sym(sym
, sec
, addr
, size
);
5310 /* put a common area */
5311 put_extern_sym(sym
, NULL
, align
, size
);
5312 /* XXX: find a nicer way */
5313 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
5314 esym
->st_shndx
= SHN_COMMON
;
5319 /* push global reference */
5320 sym
= get_sym_ref(type
, sec
, addr
, size
);
5322 vsetc(type
, VT_CONST
| VT_SYM
, &cval
);
5325 /* patch symbol weakness */
5326 if (type
->t
& VT_WEAK
)
5328 #ifdef CONFIG_TCC_BCHECK
5329 /* handles bounds now because the symbol must be defined
5330 before for the relocation */
5331 if (tcc_state
->do_bounds_check
) {
5332 unsigned long *bounds_ptr
;
5334 greloc(bounds_section
, sym
, bounds_section
->data_offset
, R_DATA_PTR
);
5335 /* then add global bound info */
5336 bounds_ptr
= section_ptr_add(bounds_section
, 2 * sizeof(long));
5337 bounds_ptr
[0] = 0; /* relocated */
5338 bounds_ptr
[1] = size
;
5342 if (has_init
|| (type
->t
& VT_VLA
)) {
5343 decl_initializer(type
, sec
, addr
, 1, 0);
5344 /* restore parse state if needed */
5346 tok_str_free(init_str
.str
);
5347 restore_parse_state(&saved_parse_state
);
5349 /* patch flexible array member size back to -1, */
5350 /* for possible subsequent similar declarations */
5352 flexible_array
->type
.ref
->c
= -1;
5357 static void put_func_debug(Sym
*sym
)
5362 /* XXX: we put here a dummy type */
5363 snprintf(buf
, sizeof(buf
), "%s:%c1",
5364 funcname
, sym
->type
.t
& VT_STATIC
? 'f' : 'F');
5365 put_stabs_r(buf
, N_FUN
, 0, file
->line_num
, 0,
5366 cur_text_section
, sym
->c
);
5367 /* //gr gdb wants a line at the function */
5368 put_stabn(N_SLINE
, 0, file
->line_num
, 0);
5373 /* parse an old style function declaration list */
5374 /* XXX: check multiple parameter */
5375 static void func_decl_list(Sym
*func_sym
)
5382 /* parse each declaration */
5383 while (tok
!= '{' && tok
!= ';' && tok
!= ',' && tok
!= TOK_EOF
&&
5384 tok
!= TOK_ASM1
&& tok
!= TOK_ASM2
&& tok
!= TOK_ASM3
) {
5385 if (!parse_btype(&btype
, &ad
))
5386 expect("declaration list");
5387 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
5388 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
5390 /* we accept no variable after */
5394 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
5395 /* find parameter in function parameter list */
5398 if ((s
->v
& ~SYM_FIELD
) == v
)
5402 tcc_error("declaration for parameter '%s' but no such parameter",
5403 get_tok_str(v
, NULL
));
5405 /* check that no storage specifier except 'register' was given */
5406 if (type
.t
& VT_STORAGE
)
5407 tcc_error("storage class specified for '%s'", get_tok_str(v
, NULL
));
5408 convert_parameter_type(&type
);
5409 /* we can add the type (NOTE: it could be local to the function) */
5411 /* accept other parameters */
5422 /* parse a function defined by symbol 'sym' and generate its code in
5423 'cur_text_section' */
5424 static void gen_function(Sym
*sym
)
5426 int saved_nocode_wanted
= nocode_wanted
;
5428 ind
= cur_text_section
->data_offset
;
5429 /* NOTE: we patch the symbol size later */
5430 put_extern_sym(sym
, cur_text_section
, ind
, 0);
5431 funcname
= get_tok_str(sym
->v
, NULL
);
5433 /* put debug symbol */
5434 if (tcc_state
->do_debug
)
5435 put_func_debug(sym
);
5436 /* push a dummy symbol to enable local sym storage */
5437 sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
5438 gfunc_prolog(&sym
->type
);
5440 block(NULL
, NULL
, NULL
, NULL
, 0, 0);
5443 cur_text_section
->data_offset
= ind
;
5444 label_pop(&global_label_stack
, NULL
);
5445 sym_pop(&local_stack
, NULL
); /* reset local stack */
5446 /* end of function */
5447 /* patch symbol size */
5448 ((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
].st_size
=
5450 /* patch symbol weakness (this definition overrules any prototype) */
5451 if (sym
->type
.t
& VT_WEAK
)
5453 if (tcc_state
->do_debug
) {
5454 put_stabn(N_FUN
, 0, 0, ind
- func_ind
);
5456 /* It's better to crash than to generate wrong code */
5457 cur_text_section
= NULL
;
5458 funcname
= ""; /* for safety */
5459 func_vt
.t
= VT_VOID
; /* for safety */
5460 ind
= 0; /* for safety */
5461 nocode_wanted
= saved_nocode_wanted
;
5464 ST_FUNC
void gen_inline_functions(void)
5467 int *str
, inline_generated
, i
;
5468 struct InlineFunc
*fn
;
5470 /* iterate while inline function are referenced */
5472 inline_generated
= 0;
5473 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
5474 fn
= tcc_state
->inline_fns
[i
];
5476 if (sym
&& sym
->c
) {
5477 /* the function was used: generate its code and
5478 convert it to a normal function */
5479 str
= fn
->token_str
;
5482 strcpy(file
->filename
, fn
->filename
);
5483 sym
->r
= VT_SYM
| VT_CONST
;
5484 sym
->type
.t
&= ~VT_INLINE
;
5488 cur_text_section
= text_section
;
5490 macro_ptr
= NULL
; /* fail safe */
5492 inline_generated
= 1;
5495 if (!inline_generated
)
5498 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
5499 fn
= tcc_state
->inline_fns
[i
];
5500 str
= fn
->token_str
;
5503 dynarray_reset(&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
);
5506 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
5507 static int decl0(int l
, int is_for_loop_init
)
5515 if (!parse_btype(&btype
, &ad
)) {
5516 if (is_for_loop_init
)
5518 /* skip redundant ';' */
5519 /* XXX: find more elegant solution */
5524 if (l
== VT_CONST
&&
5525 (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
5526 /* global asm block */
5530 /* special test for old K&R protos without explicit int
5531 type. Only accepted when defining global data */
5532 if (l
== VT_LOCAL
|| tok
< TOK_DEFINE
)
5536 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
5537 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
5539 /* we accept no variable after */
5543 while (1) { /* iterate thru each declaration */
5544 char *asm_label
; // associated asm label
5546 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
5550 type_to_str(buf
, sizeof(buf
), t
, get_tok_str(v
, NULL
));
5551 printf("type = '%s'\n", buf
);
5554 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
5555 if ((type
.t
& VT_STATIC
) && (l
== VT_LOCAL
)) {
5556 tcc_error("function without file scope cannot be static");
5558 /* if old style function prototype, we accept a
5561 if (sym
->c
== FUNC_OLD
)
5562 func_decl_list(sym
);
5566 if (gnu_ext
&& (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
5569 asm_label_instr(&astr
);
5570 asm_label
= tcc_strdup(astr
.data
);
5573 /* parse one last attribute list, after asm label */
5574 parse_attribute(&ad
);
5579 #ifdef TCC_TARGET_PE
5581 type
.t
|= VT_IMPORT
;
5583 type
.t
|= VT_EXPORT
;
5587 tcc_error("cannot use local functions");
5588 if ((type
.t
& VT_BTYPE
) != VT_FUNC
)
5589 expect("function definition");
5591 /* reject abstract declarators in function definition */
5593 while ((sym
= sym
->next
) != NULL
)
5594 if (!(sym
->v
& ~SYM_FIELD
))
5595 expect("identifier");
5597 /* XXX: cannot do better now: convert extern line to static inline */
5598 if ((type
.t
& (VT_EXTERN
| VT_INLINE
)) == (VT_EXTERN
| VT_INLINE
))
5599 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
5603 if ((sym
->type
.t
& VT_BTYPE
) != VT_FUNC
)
5606 r
= sym
->type
.ref
->r
;
5607 /* use func_call from prototype if not defined */
5608 if (FUNC_CALL(r
) != FUNC_CDECL
5609 && FUNC_CALL(type
.ref
->r
) == FUNC_CDECL
)
5610 FUNC_CALL(type
.ref
->r
) = FUNC_CALL(r
);
5612 /* use export from prototype */
5614 FUNC_EXPORT(type
.ref
->r
) = 1;
5616 /* use static from prototype */
5617 if (sym
->type
.t
& VT_STATIC
)
5618 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
5620 if (!is_compatible_types(&sym
->type
, &type
)) {
5622 tcc_error("incompatible types for redefinition of '%s'",
5623 get_tok_str(v
, NULL
));
5625 /* if symbol is already defined, then put complete type */
5628 /* put function symbol */
5629 sym
= global_identifier_push(v
, type
.t
, 0);
5630 sym
->type
.ref
= type
.ref
;
5633 /* static inline functions are just recorded as a kind
5634 of macro. Their code will be emitted at the end of
5635 the compilation unit only if they are used */
5636 if ((type
.t
& (VT_INLINE
| VT_STATIC
)) ==
5637 (VT_INLINE
| VT_STATIC
)) {
5638 TokenString func_str
;
5640 struct InlineFunc
*fn
;
5641 const char *filename
;
5643 tok_str_new(&func_str
);
5649 tcc_error("unexpected end of file");
5650 tok_str_add_tok(&func_str
);
5655 } else if (t
== '}') {
5657 if (block_level
== 0)
5661 tok_str_add(&func_str
, -1);
5662 tok_str_add(&func_str
, 0);
5663 filename
= file
? file
->filename
: "";
5664 fn
= tcc_malloc(sizeof *fn
+ strlen(filename
));
5665 strcpy(fn
->filename
, filename
);
5667 fn
->token_str
= func_str
.str
;
5668 dynarray_add((void ***)&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
, fn
);
5671 /* compute text section */
5672 cur_text_section
= ad
.section
;
5673 if (!cur_text_section
)
5674 cur_text_section
= text_section
;
5675 sym
->r
= VT_SYM
| VT_CONST
;
5680 if (btype
.t
& VT_TYPEDEF
) {
5681 /* save typedefed type */
5682 /* XXX: test storage specifiers ? */
5683 sym
= sym_push(v
, &type
, INT_ATTR(&ad
), 0);
5684 sym
->type
.t
|= VT_TYPEDEF
;
5687 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
5688 /* external function definition */
5689 /* specific case for func_call attribute */
5690 type
.ref
->r
= INT_ATTR(&ad
);
5691 } else if (!(type
.t
& VT_ARRAY
)) {
5692 /* not lvalue if array */
5693 r
|= lvalue_type(type
.t
);
5695 has_init
= (tok
== '=');
5696 if (has_init
&& (type
.t
& VT_VLA
))
5697 tcc_error("Variable length array cannot be initialized");
5698 if ((btype
.t
& VT_EXTERN
) || ((type
.t
& VT_BTYPE
) == VT_FUNC
) ||
5699 ((type
.t
& VT_ARRAY
) && (type
.t
& VT_STATIC
) &&
5700 !has_init
&& l
== VT_CONST
&& type
.ref
->c
< 0)) {
5701 /* external variable or function */
5702 /* NOTE: as GCC, uninitialized global static
5703 arrays of null size are considered as
5705 sym
= external_sym(v
, &type
, r
, asm_label
);
5707 if (type
.t
& VT_WEAK
)
5710 if (ad
.alias_target
) {
5715 alias_target
= sym_find(ad
.alias_target
);
5716 if (!alias_target
|| !alias_target
->c
)
5717 tcc_error("unsupported forward __alias__ attribute");
5718 esym
= &((Elf32_Sym
*)symtab_section
->data
)[alias_target
->c
];
5719 tsec
.sh_num
= esym
->st_shndx
;
5720 put_extern_sym2(sym
, &tsec
, esym
->st_value
, esym
->st_size
, 0);
5723 type
.t
|= (btype
.t
& VT_STATIC
); /* Retain "static". */
5724 if (type
.t
& VT_STATIC
)
5730 decl_initializer_alloc(&type
, &ad
, r
, has_init
, v
, asm_label
, l
);
5734 if (is_for_loop_init
)
5747 ST_FUNC
void decl(int l
)