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
, size_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 a pointer sized constant */
329 static void vpushs(long long v
)
336 vsetc(&size_type
, VT_CONST
, &cval
);
339 /* push long long constant */
340 static void vpushll(long long v
)
347 vsetc(&ctype
, VT_CONST
, &cval
);
350 /* push arbitrary 64bit constant */
351 void vpush64(int ty
, unsigned long long v
)
357 vsetc(&ctype
, VT_CONST
, &cval
);
360 /* Return a static symbol pointing to a section */
361 ST_FUNC Sym
*get_sym_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
367 sym
= global_identifier_push(v
, type
->t
| VT_STATIC
, 0);
368 sym
->type
.ref
= type
->ref
;
369 sym
->r
= VT_CONST
| VT_SYM
;
370 put_extern_sym(sym
, sec
, offset
, size
);
374 /* push a reference to a section offset by adding a dummy symbol */
375 static void vpush_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
380 vsetc(type
, VT_CONST
| VT_SYM
, &cval
);
381 vtop
->sym
= get_sym_ref(type
, sec
, offset
, size
);
384 /* define a new external reference to a symbol 'v' of type 'u' */
385 ST_FUNC Sym
*external_global_sym(int v
, CType
*type
, int r
)
391 /* push forward reference */
392 s
= global_identifier_push(v
, type
->t
| VT_EXTERN
, 0);
393 s
->type
.ref
= type
->ref
;
394 s
->r
= r
| VT_CONST
| VT_SYM
;
399 /* define a new external reference to a symbol 'v' with alternate asm
400 name 'asm_label' of type 'u'. 'asm_label' is equal to NULL if there
401 is no alternate name (most cases) */
402 static Sym
*external_sym(int v
, CType
*type
, int r
, char *asm_label
)
408 /* push forward reference */
409 s
= sym_push(v
, type
, r
| VT_CONST
| VT_SYM
, 0);
410 s
->asm_label
= asm_label
;
411 s
->type
.t
|= VT_EXTERN
;
412 } else if (s
->type
.ref
== func_old_type
.ref
) {
413 s
->type
.ref
= type
->ref
;
414 s
->r
= r
| VT_CONST
| VT_SYM
;
415 s
->type
.t
|= VT_EXTERN
;
416 } else if (!is_compatible_types(&s
->type
, type
)) {
417 tcc_error("incompatible types for redefinition of '%s'",
418 get_tok_str(v
, NULL
));
423 /* push a reference to global symbol v */
424 ST_FUNC
void vpush_global_sym(CType
*type
, int v
)
429 sym
= external_global_sym(v
, type
, 0);
431 vsetc(type
, VT_CONST
| VT_SYM
, &cval
);
435 ST_FUNC
void vset(CType
*type
, int r
, int v
)
440 vsetc(type
, r
, &cval
);
443 static void vseti(int r
, int v
)
451 ST_FUNC
void vswap(void)
455 /* cannot let cpu flags if other instruction are generated. Also
456 avoid leaving VT_JMP anywhere except on the top of the stack
457 because it would complicate the code generator. */
458 if (vtop
>= vstack
) {
459 int v
= vtop
->r
& VT_VALMASK
;
460 if (v
== VT_CMP
|| (v
& ~1) == VT_JMP
)
468 ST_FUNC
void vpushv(SValue
*v
)
470 if (vtop
>= vstack
+ (VSTACK_SIZE
- 1))
471 tcc_error("memory full");
476 static void vdup(void)
481 /* save r to the memory stack, and mark it as being free */
482 ST_FUNC
void save_reg(int r
)
484 int l
, saved
, size
, align
;
488 /* modify all stack values */
491 for(p
=vstack
;p
<=vtop
;p
++) {
492 if ((p
->r
& VT_VALMASK
) == r
||
493 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& (p
->r2
& VT_VALMASK
) == r
)) {
494 /* must save value on stack if not already done */
496 /* NOTE: must reload 'r' because r might be equal to r2 */
497 r
= p
->r
& VT_VALMASK
;
498 /* store register in the stack */
500 if ((p
->r
& VT_LVAL
) ||
501 (!is_float(type
->t
) && (type
->t
& VT_BTYPE
) != VT_LLONG
))
502 #ifdef TCC_TARGET_X86_64
503 type
= &char_pointer_type
;
507 size
= type_size(type
, &align
);
508 loc
= (loc
- size
) & -align
;
510 sv
.r
= VT_LOCAL
| VT_LVAL
;
513 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
514 /* x86 specific: need to pop fp register ST0 if saved */
516 o(0xd8dd); /* fstp %st(0) */
519 #ifndef TCC_TARGET_X86_64
520 /* special long long case */
521 if ((type
->t
& VT_BTYPE
) == VT_LLONG
) {
529 /* mark that stack entry as being saved on the stack */
530 if (p
->r
& VT_LVAL
) {
531 /* also clear the bounded flag because the
532 relocation address of the function was stored in
534 p
->r
= (p
->r
& ~(VT_VALMASK
| VT_BOUNDED
)) | VT_LLOCAL
;
536 p
->r
= lvalue_type(p
->type
.t
) | VT_LOCAL
;
544 #ifdef TCC_TARGET_ARM
545 /* find a register of class 'rc2' with at most one reference on stack.
546 * If none, call get_reg(rc) */
547 ST_FUNC
int get_reg_ex(int rc
, int rc2
)
552 for(r
=0;r
<NB_REGS
;r
++) {
553 if (reg_classes
[r
] & rc2
) {
556 for(p
= vstack
; p
<= vtop
; p
++) {
557 if ((p
->r
& VT_VALMASK
) == r
||
558 (p
->r2
& VT_VALMASK
) == r
)
569 /* find a free register of class 'rc'. If none, save one register */
570 ST_FUNC
int get_reg(int rc
)
575 /* find a free register */
576 for(r
=0;r
<NB_REGS
;r
++) {
577 if (reg_classes
[r
] & rc
) {
578 for(p
=vstack
;p
<=vtop
;p
++) {
579 if ((p
->r
& VT_VALMASK
) == r
||
580 (p
->r2
& VT_VALMASK
) == r
)
588 /* no register left : free the first one on the stack (VERY
589 IMPORTANT to start from the bottom to ensure that we don't
590 spill registers used in gen_opi()) */
591 for(p
=vstack
;p
<=vtop
;p
++) {
592 r
= p
->r
& VT_VALMASK
;
593 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
))
595 /* also look at second register (if long long) */
596 r
= p
->r2
& VT_VALMASK
;
597 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
)) {
603 /* Should never comes here */
607 /* save registers up to (vtop - n) stack entry */
608 ST_FUNC
void save_regs(int n
)
613 for(p
= vstack
;p
<= p1
; p
++) {
614 r
= p
->r
& VT_VALMASK
;
621 /* move register 's' to 'r', and flush previous value of r to memory
623 static void move_reg(int r
, int s
)
636 /* get address of vtop (vtop MUST BE an lvalue) */
637 static void gaddrof(void)
639 if (vtop
->r
& VT_REF
)
642 /* tricky: if saved lvalue, then we can go back to lvalue */
643 if ((vtop
->r
& VT_VALMASK
) == VT_LLOCAL
)
644 vtop
->r
= (vtop
->r
& ~(VT_VALMASK
| VT_LVAL_TYPE
)) | VT_LOCAL
| VT_LVAL
;
649 #ifdef CONFIG_TCC_BCHECK
650 /* generate lvalue bound code */
651 static void gbound(void)
656 vtop
->r
&= ~VT_MUSTBOUND
;
657 /* if lvalue, then use checking code before dereferencing */
658 if (vtop
->r
& VT_LVAL
) {
659 /* if not VT_BOUNDED value, then make one */
660 if (!(vtop
->r
& VT_BOUNDED
)) {
661 lval_type
= vtop
->r
& (VT_LVAL_TYPE
| VT_LVAL
);
662 /* must save type because we must set it to int to get pointer */
664 vtop
->type
.t
= VT_INT
;
667 gen_bounded_ptr_add();
668 vtop
->r
|= lval_type
;
671 /* then check for dereferencing */
672 gen_bounded_ptr_deref();
677 /* store vtop a register belonging to class 'rc'. lvalues are
678 converted to values. Cannot be used if cannot be converted to
679 register value (such as structures). */
680 ST_FUNC
int gv(int rc
)
682 int r
, bit_pos
, bit_size
, size
, align
, i
;
683 #ifndef TCC_TARGET_X86_64
687 /* NOTE: get_reg can modify vstack[] */
688 if (vtop
->type
.t
& VT_BITFIELD
) {
691 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
692 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
693 /* remove bit field info to avoid loops */
694 vtop
->type
.t
&= ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
));
695 /* cast to int to propagate signedness in following ops */
696 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
701 if((vtop
->type
.t
& VT_UNSIGNED
) ||
702 (vtop
->type
.t
& VT_BTYPE
) == VT_BOOL
)
703 type
.t
|= VT_UNSIGNED
;
705 /* generate shifts */
706 vpushi(bits
- (bit_pos
+ bit_size
));
708 vpushi(bits
- bit_size
);
709 /* NOTE: transformed to SHR if unsigned */
713 if (is_float(vtop
->type
.t
) &&
714 (vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
717 unsigned long offset
;
718 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
722 /* XXX: unify with initializers handling ? */
723 /* CPUs usually cannot use float constants, so we store them
724 generically in data segment */
725 size
= type_size(&vtop
->type
, &align
);
726 offset
= (data_section
->data_offset
+ align
- 1) & -align
;
727 data_section
->data_offset
= offset
;
728 /* XXX: not portable yet */
729 #if defined(__i386__) || defined(__x86_64__)
730 /* Zero pad x87 tenbyte long doubles */
731 if (size
== LDOUBLE_SIZE
) {
732 vtop
->c
.tab
[2] &= 0xffff;
733 #if LDOUBLE_SIZE == 16
738 ptr
= section_ptr_add(data_section
, size
);
740 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
744 ptr
[i
] = vtop
->c
.tab
[size
-1-i
];
748 ptr
[i
] = vtop
->c
.tab
[i
];
749 sym
= get_sym_ref(&vtop
->type
, data_section
, offset
, size
<< 2);
750 vtop
->r
|= VT_LVAL
| VT_SYM
;
754 #ifdef CONFIG_TCC_BCHECK
755 if (vtop
->r
& VT_MUSTBOUND
)
759 r
= vtop
->r
& VT_VALMASK
;
760 #ifndef TCC_TARGET_X86_64
765 /* need to reload if:
767 - lvalue (need to dereference pointer)
768 - already a register, but not in the right class */
770 || (vtop
->r
& VT_LVAL
)
771 || !(reg_classes
[r
] & rc
)
772 #ifndef TCC_TARGET_X86_64
773 || ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
&& !(reg_classes
[vtop
->r2
] & rc2
))
778 #ifndef TCC_TARGET_X86_64
779 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
781 unsigned long long ll
;
782 /* two register type load : expand to two words
784 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
787 vtop
->c
.ui
= ll
; /* first word */
789 vtop
->r
= r
; /* save register value */
790 vpushi(ll
>> 32); /* second word */
791 } else if (r
>= VT_CONST
|| /* XXX: test to VT_CONST incorrect ? */
792 (vtop
->r
& VT_LVAL
)) {
793 /* We do not want to modifier the long long
794 pointer here, so the safest (and less
795 efficient) is to save all the other registers
796 in the stack. XXX: totally inefficient. */
798 /* load from memory */
801 vtop
[-1].r
= r
; /* save register value */
802 /* increment pointer to get second word */
803 vtop
->type
.t
= VT_INT
;
812 vtop
[-1].r
= r
; /* save register value */
813 vtop
->r
= vtop
[-1].r2
;
815 /* allocate second register */
819 /* write second register */
823 if ((vtop
->r
& VT_LVAL
) && !is_float(vtop
->type
.t
)) {
825 /* lvalue of scalar type : need to use lvalue type
826 because of possible cast */
829 /* compute memory access type */
830 if (vtop
->r
& VT_LVAL_BYTE
)
832 else if (vtop
->r
& VT_LVAL_SHORT
)
834 if (vtop
->r
& VT_LVAL_UNSIGNED
)
838 /* restore wanted type */
841 /* one register type load */
846 #ifdef TCC_TARGET_C67
847 /* uses register pairs for doubles */
848 if ((vtop
->type
.t
& VT_BTYPE
) == VT_DOUBLE
)
855 /* generate vtop[-1] and vtop[0] in resp. classes rc1 and rc2 */
856 ST_FUNC
void gv2(int rc1
, int rc2
)
860 /* generate more generic register first. But VT_JMP or VT_CMP
861 values must be generated first in all cases to avoid possible
863 v
= vtop
[0].r
& VT_VALMASK
;
864 if (v
!= VT_CMP
&& (v
& ~1) != VT_JMP
&& rc1
<= rc2
) {
869 /* test if reload is needed for first register */
870 if ((vtop
[-1].r
& VT_VALMASK
) >= VT_CONST
) {
880 /* test if reload is needed for first register */
881 if ((vtop
[0].r
& VT_VALMASK
) >= VT_CONST
) {
887 /* wrapper around RC_FRET to return a register by type */
888 static int rc_fret(int t
)
890 #ifdef TCC_TARGET_X86_64
891 if (t
== VT_LDOUBLE
) {
898 /* wrapper around REG_FRET to return a register by type */
899 static int reg_fret(int t
)
901 #ifdef TCC_TARGET_X86_64
902 if (t
== VT_LDOUBLE
) {
909 /* expand long long on stack in two int registers */
910 static void lexpand(void)
914 u
= vtop
->type
.t
& VT_UNSIGNED
;
917 vtop
[0].r
= vtop
[-1].r2
;
918 vtop
[0].r2
= VT_CONST
;
919 vtop
[-1].r2
= VT_CONST
;
920 vtop
[0].type
.t
= VT_INT
| u
;
921 vtop
[-1].type
.t
= VT_INT
| u
;
924 #ifdef TCC_TARGET_ARM
925 /* expand long long on stack */
926 ST_FUNC
void lexpand_nr(void)
930 u
= vtop
->type
.t
& VT_UNSIGNED
;
933 vtop
->type
.t
= VT_INT
| u
;
934 v
=vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
);
936 vtop
[-1].c
.ui
= vtop
->c
.ull
;
937 vtop
->c
.ui
= vtop
->c
.ull
>> 32;
939 } else if (v
== (VT_LVAL
|VT_CONST
) || v
== (VT_LVAL
|VT_LOCAL
)) {
941 vtop
->r
= vtop
[-1].r
;
942 } else if (v
> VT_CONST
) {
946 vtop
->r
= vtop
[-1].r2
;
947 vtop
[-1].r2
= VT_CONST
;
948 vtop
[-1].type
.t
= VT_INT
| u
;
952 /* build a long long from two ints */
953 static void lbuild(int t
)
956 vtop
[-1].r2
= vtop
[0].r
;
961 /* rotate n first stack elements to the bottom
962 I1 ... In -> I2 ... In I1 [top is right]
964 static void vrotb(int n
)
975 /* rotate n first stack elements to the top
976 I1 ... In -> In I1 ... I(n-1) [top is right]
978 ST_FUNC
void vrott(int n
)
984 for(i
= 0;i
< n
- 1; i
++)
985 vtop
[-i
] = vtop
[-i
- 1];
989 /* pop stack value */
990 ST_FUNC
void vpop(void)
993 v
= vtop
->r
& VT_VALMASK
;
994 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
995 /* for x86, we need to pop the FP stack */
996 if (v
== TREG_ST0
&& !nocode_wanted
) {
997 o(0xd8dd); /* fstp %st(0) */
1000 if (v
== VT_JMP
|| v
== VT_JMPI
) {
1001 /* need to put correct jump if && or || without test */
1007 /* convert stack entry to register and duplicate its value in another
1009 static void gv_dup(void)
1015 if ((t
& VT_BTYPE
) == VT_LLONG
) {
1022 /* stack: H L L1 H1 */
1030 /* duplicate value */
1035 #ifdef TCC_TARGET_X86_64
1036 if ((t
& VT_BTYPE
) == VT_LDOUBLE
) {
1046 load(r1
, &sv
); /* move r to r1 */
1048 /* duplicates value */
1054 #ifndef TCC_TARGET_X86_64
1055 /* generate CPU independent (unsigned) long long operations */
1056 static void gen_opl(int op
)
1058 int t
, a
, b
, op1
, c
, i
;
1060 unsigned short reg_iret
= REG_IRET
;
1061 unsigned short reg_lret
= REG_LRET
;
1067 func
= TOK___divdi3
;
1070 func
= TOK___udivdi3
;
1073 func
= TOK___moddi3
;
1076 func
= TOK___umoddi3
;
1083 /* call generic long long function */
1084 vpush_global_sym(&func_old_type
, func
);
1089 vtop
->r2
= reg_lret
;
1102 /* stack: L1 H1 L2 H2 */
1107 vtop
[-2] = vtop
[-3];
1110 /* stack: H1 H2 L1 L2 */
1116 /* stack: H1 H2 L1 L2 ML MH */
1119 /* stack: ML MH H1 H2 L1 L2 */
1123 /* stack: ML MH H1 L2 H2 L1 */
1128 /* stack: ML MH M1 M2 */
1131 } else if (op
== '+' || op
== '-') {
1132 /* XXX: add non carry method too (for MIPS or alpha) */
1138 /* stack: H1 H2 (L1 op L2) */
1141 gen_op(op1
+ 1); /* TOK_xxxC2 */
1144 /* stack: H1 H2 (L1 op L2) */
1147 /* stack: (L1 op L2) H1 H2 */
1149 /* stack: (L1 op L2) (H1 op H2) */
1157 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
1158 t
= vtop
[-1].type
.t
;
1162 /* stack: L H shift */
1164 /* constant: simpler */
1165 /* NOTE: all comments are for SHL. the other cases are
1166 done by swaping words */
1177 if (op
!= TOK_SAR
) {
1210 /* XXX: should provide a faster fallback on x86 ? */
1213 func
= TOK___ashrdi3
;
1216 func
= TOK___lshrdi3
;
1219 func
= TOK___ashldi3
;
1225 /* compare operations */
1231 /* stack: L1 H1 L2 H2 */
1233 vtop
[-1] = vtop
[-2];
1235 /* stack: L1 L2 H1 H2 */
1238 /* when values are equal, we need to compare low words. since
1239 the jump is inverted, we invert the test too. */
1242 else if (op1
== TOK_GT
)
1244 else if (op1
== TOK_ULT
)
1246 else if (op1
== TOK_UGT
)
1251 if (op1
!= TOK_NE
) {
1255 /* generate non equal test */
1256 /* XXX: NOT PORTABLE yet */
1260 #if defined(TCC_TARGET_I386)
1261 b
= psym(0x850f, 0);
1262 #elif defined(TCC_TARGET_ARM)
1264 o(0x1A000000 | encbranch(ind
, 0, 1));
1265 #elif defined(TCC_TARGET_C67)
1266 tcc_error("not implemented");
1268 #error not supported
1272 /* compare low. Always unsigned */
1276 else if (op1
== TOK_LE
)
1278 else if (op1
== TOK_GT
)
1280 else if (op1
== TOK_GE
)
1291 /* handle integer constant optimizations and various machine
1293 static void gen_opic(int op
)
1295 int c1
, c2
, t1
, t2
, n
;
1298 typedef unsigned long long U
;
1302 t1
= v1
->type
.t
& VT_BTYPE
;
1303 t2
= v2
->type
.t
& VT_BTYPE
;
1307 else if (v1
->type
.t
& VT_UNSIGNED
)
1314 else if (v2
->type
.t
& VT_UNSIGNED
)
1319 /* currently, we cannot do computations with forward symbols */
1320 c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1321 c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1324 case '+': l1
+= l2
; break;
1325 case '-': l1
-= l2
; break;
1326 case '&': l1
&= l2
; break;
1327 case '^': l1
^= l2
; break;
1328 case '|': l1
|= l2
; break;
1329 case '*': l1
*= l2
; break;
1336 /* if division by zero, generate explicit division */
1339 tcc_error("division by zero in constant");
1343 default: l1
/= l2
; break;
1344 case '%': l1
%= l2
; break;
1345 case TOK_UDIV
: l1
= (U
)l1
/ l2
; break;
1346 case TOK_UMOD
: l1
= (U
)l1
% l2
; break;
1349 case TOK_SHL
: l1
<<= l2
; break;
1350 case TOK_SHR
: l1
= (U
)l1
>> l2
; break;
1351 case TOK_SAR
: l1
>>= l2
; break;
1353 case TOK_ULT
: l1
= (U
)l1
< (U
)l2
; break;
1354 case TOK_UGE
: l1
= (U
)l1
>= (U
)l2
; break;
1355 case TOK_EQ
: l1
= l1
== l2
; break;
1356 case TOK_NE
: l1
= l1
!= l2
; break;
1357 case TOK_ULE
: l1
= (U
)l1
<= (U
)l2
; break;
1358 case TOK_UGT
: l1
= (U
)l1
> (U
)l2
; break;
1359 case TOK_LT
: l1
= l1
< l2
; break;
1360 case TOK_GE
: l1
= l1
>= l2
; break;
1361 case TOK_LE
: l1
= l1
<= l2
; break;
1362 case TOK_GT
: l1
= l1
> l2
; break;
1364 case TOK_LAND
: l1
= l1
&& l2
; break;
1365 case TOK_LOR
: l1
= l1
|| l2
; break;
1372 /* if commutative ops, put c2 as constant */
1373 if (c1
&& (op
== '+' || op
== '&' || op
== '^' ||
1374 op
== '|' || op
== '*')) {
1376 c2
= c1
; //c = c1, c1 = c2, c2 = c;
1377 l2
= l1
; //l = l1, l1 = l2, l2 = l;
1379 /* Filter out NOP operations like x*1, x-0, x&-1... */
1380 if (c2
&& (((op
== '*' || op
== '/' || op
== TOK_UDIV
||
1383 ((op
== '+' || op
== '-' || op
== '|' || op
== '^' ||
1384 op
== TOK_SHL
|| op
== TOK_SHR
|| op
== TOK_SAR
) &&
1390 } else if (c2
&& (op
== '*' || op
== TOK_PDIV
|| op
== TOK_UDIV
)) {
1391 /* try to use shifts instead of muls or divs */
1392 if (l2
> 0 && (l2
& (l2
- 1)) == 0) {
1401 else if (op
== TOK_PDIV
)
1407 } else if (c2
&& (op
== '+' || op
== '-') &&
1408 (((vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
))
1409 || (vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
)) == VT_LOCAL
)) {
1410 /* symbol + constant case */
1417 if (!nocode_wanted
) {
1418 /* call low level op generator */
1419 if (t1
== VT_LLONG
|| t2
== VT_LLONG
)
1430 /* generate a floating point operation with constant propagation */
1431 static void gen_opif(int op
)
1439 /* currently, we cannot do computations with forward symbols */
1440 c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1441 c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1443 if (v1
->type
.t
== VT_FLOAT
) {
1446 } else if (v1
->type
.t
== VT_DOUBLE
) {
1454 /* NOTE: we only do constant propagation if finite number (not
1455 NaN or infinity) (ANSI spec) */
1456 if (!ieee_finite(f1
) || !ieee_finite(f2
))
1460 case '+': f1
+= f2
; break;
1461 case '-': f1
-= f2
; break;
1462 case '*': f1
*= f2
; break;
1466 tcc_error("division by zero in constant");
1471 /* XXX: also handles tests ? */
1475 /* XXX: overflow test ? */
1476 if (v1
->type
.t
== VT_FLOAT
) {
1478 } else if (v1
->type
.t
== VT_DOUBLE
) {
1486 if (!nocode_wanted
) {
1494 static int pointed_size(CType
*type
)
1497 return type_size(pointed_type(type
), &align
);
1500 static void vla_runtime_pointed_size(CType
*type
)
1503 vla_runtime_type_size(pointed_type(type
), &align
);
1506 static inline int is_null_pointer(SValue
*p
)
1508 if ((p
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
1510 return ((p
->type
.t
& VT_BTYPE
) == VT_INT
&& p
->c
.i
== 0) ||
1511 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& p
->c
.ll
== 0) ||
1512 ((p
->type
.t
& VT_BTYPE
) == VT_PTR
&& p
->c
.ptr
== 0);
1515 static inline int is_integer_btype(int bt
)
1517 return (bt
== VT_BYTE
|| bt
== VT_SHORT
||
1518 bt
== VT_INT
|| bt
== VT_LLONG
);
1521 /* check types for comparison or substraction of pointers */
1522 static void check_comparison_pointer_types(SValue
*p1
, SValue
*p2
, int op
)
1524 CType
*type1
, *type2
, tmp_type1
, tmp_type2
;
1527 /* null pointers are accepted for all comparisons as gcc */
1528 if (is_null_pointer(p1
) || is_null_pointer(p2
))
1532 bt1
= type1
->t
& VT_BTYPE
;
1533 bt2
= type2
->t
& VT_BTYPE
;
1534 /* accept comparison between pointer and integer with a warning */
1535 if ((is_integer_btype(bt1
) || is_integer_btype(bt2
)) && op
!= '-') {
1536 if (op
!= TOK_LOR
&& op
!= TOK_LAND
)
1537 tcc_warning("comparison between pointer and integer");
1541 /* both must be pointers or implicit function pointers */
1542 if (bt1
== VT_PTR
) {
1543 type1
= pointed_type(type1
);
1544 } else if (bt1
!= VT_FUNC
)
1545 goto invalid_operands
;
1547 if (bt2
== VT_PTR
) {
1548 type2
= pointed_type(type2
);
1549 } else if (bt2
!= VT_FUNC
) {
1551 tcc_error("invalid operands to binary %s", get_tok_str(op
, NULL
));
1553 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
1554 (type2
->t
& VT_BTYPE
) == VT_VOID
)
1558 tmp_type1
.t
&= ~(VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1559 tmp_type2
.t
&= ~(VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1560 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
1561 /* gcc-like error if '-' is used */
1563 goto invalid_operands
;
1565 tcc_warning("comparison of distinct pointer types lacks a cast");
1569 /* generic gen_op: handles types problems */
1570 ST_FUNC
void gen_op(int op
)
1572 int u
, t1
, t2
, bt1
, bt2
, t
;
1575 t1
= vtop
[-1].type
.t
;
1576 t2
= vtop
[0].type
.t
;
1577 bt1
= t1
& VT_BTYPE
;
1578 bt2
= t2
& VT_BTYPE
;
1580 if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
1581 /* at least one operand is a pointer */
1582 /* relationnal op: must be both pointers */
1583 if (op
>= TOK_ULT
&& op
<= TOK_LOR
) {
1584 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1585 /* pointers are handled are unsigned */
1586 #ifdef TCC_TARGET_X86_64
1587 t
= VT_LLONG
| VT_UNSIGNED
;
1589 t
= VT_INT
| VT_UNSIGNED
;
1593 /* if both pointers, then it must be the '-' op */
1594 if (bt1
== VT_PTR
&& bt2
== VT_PTR
) {
1596 tcc_error("cannot use pointers here");
1597 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1598 /* XXX: check that types are compatible */
1599 if (vtop
[-1].type
.t
& VT_VLA
) {
1600 vla_runtime_pointed_size(&vtop
[-1].type
);
1602 vpushi(pointed_size(&vtop
[-1].type
));
1606 /* set to integer type */
1607 #ifdef TCC_TARGET_X86_64
1608 vtop
->type
.t
= VT_LLONG
;
1610 vtop
->type
.t
= VT_INT
;
1615 /* exactly one pointer : must be '+' or '-'. */
1616 if (op
!= '-' && op
!= '+')
1617 tcc_error("cannot use pointers here");
1618 /* Put pointer as first operand */
1619 if (bt2
== VT_PTR
) {
1623 type1
= vtop
[-1].type
;
1624 type1
.t
&= ~VT_ARRAY
;
1625 if (vtop
[-1].type
.t
& VT_VLA
)
1626 vla_runtime_pointed_size(&vtop
[-1].type
);
1628 u
= pointed_size(&vtop
[-1].type
);
1630 tcc_error("unknown array element size");
1631 #ifdef TCC_TARGET_X86_64
1634 /* XXX: cast to int ? (long long case) */
1639 #ifdef CONFIG_TCC_BCHECK
1640 /* if evaluating constant expression, no code should be
1641 generated, so no bound check */
1642 if (tcc_state
->do_bounds_check
&& !const_wanted
) {
1643 /* if bounded pointers, we generate a special code to
1650 gen_bounded_ptr_add();
1656 /* put again type if gen_opic() swaped operands */
1659 } else if (is_float(bt1
) || is_float(bt2
)) {
1660 /* compute bigger type and do implicit casts */
1661 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
1663 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
1668 /* floats can only be used for a few operations */
1669 if (op
!= '+' && op
!= '-' && op
!= '*' && op
!= '/' &&
1670 (op
< TOK_ULT
|| op
> TOK_GT
))
1671 tcc_error("invalid operands for binary operation");
1673 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
1674 /* cast to biggest op */
1676 /* convert to unsigned if it does not fit in a long long */
1677 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
1678 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
1682 /* integer operations */
1684 /* convert to unsigned if it does not fit in an integer */
1685 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
1686 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
1689 /* XXX: currently, some unsigned operations are explicit, so
1690 we modify them here */
1691 if (t
& VT_UNSIGNED
) {
1698 else if (op
== TOK_LT
)
1700 else if (op
== TOK_GT
)
1702 else if (op
== TOK_LE
)
1704 else if (op
== TOK_GE
)
1711 /* special case for shifts and long long: we keep the shift as
1713 if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
)
1720 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
1721 /* relationnal op: the result is an int */
1722 vtop
->type
.t
= VT_INT
;
1729 #ifndef TCC_TARGET_ARM
1730 /* generic itof for unsigned long long case */
1731 static void gen_cvt_itof1(int t
)
1733 if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
1734 (VT_LLONG
| VT_UNSIGNED
)) {
1737 vpush_global_sym(&func_old_type
, TOK___floatundisf
);
1738 #if LDOUBLE_SIZE != 8
1739 else if (t
== VT_LDOUBLE
)
1740 vpush_global_sym(&func_old_type
, TOK___floatundixf
);
1743 vpush_global_sym(&func_old_type
, TOK___floatundidf
);
1747 vtop
->r
= reg_fret(t
);
1754 /* generic ftoi for unsigned long long case */
1755 static void gen_cvt_ftoi1(int t
)
1759 if (t
== (VT_LLONG
| VT_UNSIGNED
)) {
1760 /* not handled natively */
1761 st
= vtop
->type
.t
& VT_BTYPE
;
1763 vpush_global_sym(&func_old_type
, TOK___fixunssfdi
);
1764 #if LDOUBLE_SIZE != 8
1765 else if (st
== VT_LDOUBLE
)
1766 vpush_global_sym(&func_old_type
, TOK___fixunsxfdi
);
1769 vpush_global_sym(&func_old_type
, TOK___fixunsdfdi
);
1774 vtop
->r2
= REG_LRET
;
1780 /* force char or short cast */
1781 static void force_charshort_cast(int t
)
1785 /* XXX: add optimization if lvalue : just change type and offset */
1790 if (t
& VT_UNSIGNED
) {
1791 vpushi((1 << bits
) - 1);
1797 /* result must be signed or the SAR is converted to an SHL
1798 This was not the case when "t" was a signed short
1799 and the last value on the stack was an unsigned int */
1800 vtop
->type
.t
&= ~VT_UNSIGNED
;
1806 /* cast 'vtop' to 'type'. Casting to bitfields is forbidden. */
1807 static void gen_cast(CType
*type
)
1809 int sbt
, dbt
, sf
, df
, c
, p
;
1811 /* special delayed cast for char/short */
1812 /* XXX: in some cases (multiple cascaded casts), it may still
1814 if (vtop
->r
& VT_MUSTCAST
) {
1815 vtop
->r
&= ~VT_MUSTCAST
;
1816 force_charshort_cast(vtop
->type
.t
);
1819 /* bitfields first get cast to ints */
1820 if (vtop
->type
.t
& VT_BITFIELD
) {
1824 dbt
= type
->t
& (VT_BTYPE
| VT_UNSIGNED
);
1825 sbt
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
1830 c
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1831 p
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
);
1833 /* constant case: we can do it now */
1834 /* XXX: in ISOC, cannot do it if error in convert */
1835 if (sbt
== VT_FLOAT
)
1836 vtop
->c
.ld
= vtop
->c
.f
;
1837 else if (sbt
== VT_DOUBLE
)
1838 vtop
->c
.ld
= vtop
->c
.d
;
1841 if ((sbt
& VT_BTYPE
) == VT_LLONG
) {
1842 if (sbt
& VT_UNSIGNED
)
1843 vtop
->c
.ld
= vtop
->c
.ull
;
1845 vtop
->c
.ld
= vtop
->c
.ll
;
1847 if (sbt
& VT_UNSIGNED
)
1848 vtop
->c
.ld
= vtop
->c
.ui
;
1850 vtop
->c
.ld
= vtop
->c
.i
;
1853 if (dbt
== VT_FLOAT
)
1854 vtop
->c
.f
= (float)vtop
->c
.ld
;
1855 else if (dbt
== VT_DOUBLE
)
1856 vtop
->c
.d
= (double)vtop
->c
.ld
;
1857 } else if (sf
&& dbt
== (VT_LLONG
|VT_UNSIGNED
)) {
1858 vtop
->c
.ull
= (unsigned long long)vtop
->c
.ld
;
1859 } else if (sf
&& dbt
== VT_BOOL
) {
1860 vtop
->c
.i
= (vtop
->c
.ld
!= 0);
1863 vtop
->c
.ll
= (long long)vtop
->c
.ld
;
1864 else if (sbt
== (VT_LLONG
|VT_UNSIGNED
))
1865 vtop
->c
.ll
= vtop
->c
.ull
;
1866 else if (sbt
& VT_UNSIGNED
)
1867 vtop
->c
.ll
= vtop
->c
.ui
;
1868 #ifdef TCC_TARGET_X86_64
1869 else if (sbt
== VT_PTR
)
1872 else if (sbt
!= VT_LLONG
)
1873 vtop
->c
.ll
= vtop
->c
.i
;
1875 if (dbt
== (VT_LLONG
|VT_UNSIGNED
))
1876 vtop
->c
.ull
= vtop
->c
.ll
;
1877 else if (dbt
== VT_BOOL
)
1878 vtop
->c
.i
= (vtop
->c
.ll
!= 0);
1879 else if (dbt
!= VT_LLONG
) {
1881 if ((dbt
& VT_BTYPE
) == VT_BYTE
)
1883 else if ((dbt
& VT_BTYPE
) == VT_SHORT
)
1886 if(dbt
& VT_UNSIGNED
)
1887 vtop
->c
.ui
= ((unsigned int)vtop
->c
.ll
<< s
) >> s
;
1889 vtop
->c
.i
= ((int)vtop
->c
.ll
<< s
) >> s
;
1892 } else if (p
&& dbt
== VT_BOOL
) {
1895 } else if (!nocode_wanted
) {
1896 /* non constant case: generate code */
1898 /* convert from fp to fp */
1901 /* convert int to fp */
1904 /* convert fp to int */
1905 if (dbt
== VT_BOOL
) {
1909 /* we handle char/short/etc... with generic code */
1910 if (dbt
!= (VT_INT
| VT_UNSIGNED
) &&
1911 dbt
!= (VT_LLONG
| VT_UNSIGNED
) &&
1915 if (dbt
== VT_INT
&& (type
->t
& (VT_BTYPE
| VT_UNSIGNED
)) != dbt
) {
1916 /* additional cast for char/short... */
1921 #ifndef TCC_TARGET_X86_64
1922 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
) {
1923 if ((sbt
& VT_BTYPE
) != VT_LLONG
) {
1924 /* scalar to long long */
1925 /* machine independent conversion */
1927 /* generate high word */
1928 if (sbt
== (VT_INT
| VT_UNSIGNED
)) {
1932 if (sbt
== VT_PTR
) {
1933 /* cast from pointer to int before we apply
1934 shift operation, which pointers don't support*/
1935 gen_cast(&int_type
);
1941 /* patch second register */
1942 vtop
[-1].r2
= vtop
->r
;
1946 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
||
1947 (dbt
& VT_BTYPE
) == VT_PTR
||
1948 (dbt
& VT_BTYPE
) == VT_FUNC
) {
1949 if ((sbt
& VT_BTYPE
) != VT_LLONG
&&
1950 (sbt
& VT_BTYPE
) != VT_PTR
&&
1951 (sbt
& VT_BTYPE
) != VT_FUNC
) {
1952 /* need to convert from 32bit to 64bit */
1954 if (sbt
!= (VT_INT
| VT_UNSIGNED
)) {
1955 /* x86_64 specific: movslq */
1957 o(0xc0 + (REG_VALUE(r
) << 3) + REG_VALUE(r
));
1961 } else if (dbt
== VT_BOOL
) {
1962 /* scalar to bool */
1965 } else if ((dbt
& VT_BTYPE
) == VT_BYTE
||
1966 (dbt
& VT_BTYPE
) == VT_SHORT
) {
1967 if (sbt
== VT_PTR
) {
1968 vtop
->type
.t
= VT_INT
;
1969 tcc_warning("nonportable conversion from pointer to char/short");
1971 force_charshort_cast(dbt
);
1972 } else if ((dbt
& VT_BTYPE
) == VT_INT
) {
1974 if (sbt
== VT_LLONG
) {
1975 /* from long long: just take low order word */
1979 /* if lvalue and single word type, nothing to do because
1980 the lvalue already contains the real type size (see
1981 VT_LVAL_xxx constants) */
1984 } else if ((dbt
& VT_BTYPE
) == VT_PTR
&& !(vtop
->r
& VT_LVAL
)) {
1985 /* if we are casting between pointer types,
1986 we must update the VT_LVAL_xxx size */
1987 vtop
->r
= (vtop
->r
& ~VT_LVAL_TYPE
)
1988 | (lvalue_type(type
->ref
->type
.t
) & VT_LVAL_TYPE
);
1993 /* return type size as known at compile time. Put alignment at 'a' */
1994 ST_FUNC
int type_size(CType
*type
, int *a
)
1999 bt
= type
->t
& VT_BTYPE
;
2000 if (bt
== VT_STRUCT
) {
2005 } else if (bt
== VT_PTR
) {
2006 if (type
->t
& VT_ARRAY
) {
2010 ts
= type_size(&s
->type
, a
);
2012 if (ts
< 0 && s
->c
< 0)
2020 } else if (bt
== VT_LDOUBLE
) {
2022 return LDOUBLE_SIZE
;
2023 } else if (bt
== VT_DOUBLE
|| bt
== VT_LLONG
) {
2024 #ifdef TCC_TARGET_I386
2025 #ifdef TCC_TARGET_PE
2030 #elif defined(TCC_TARGET_ARM)
2040 } else if (bt
== VT_INT
|| bt
== VT_ENUM
|| bt
== VT_FLOAT
) {
2043 } else if (bt
== VT_SHORT
) {
2047 /* char, void, function, _Bool */
2053 /* push type size as known at runtime time on top of value stack. Put
2055 ST_FUNC
void vla_runtime_type_size(CType
*type
, int *a
)
2057 if (type
->t
& VT_VLA
) {
2058 vset(&int_type
, VT_LOCAL
|VT_LVAL
, type
->ref
->c
);
2060 vpushi(type_size(type
, a
));
2064 /* return the pointed type of t */
2065 static inline CType
*pointed_type(CType
*type
)
2067 return &type
->ref
->type
;
2070 /* modify type so that its it is a pointer to type. */
2071 ST_FUNC
void mk_pointer(CType
*type
)
2074 s
= sym_push(SYM_FIELD
, type
, 0, -1);
2075 type
->t
= VT_PTR
| (type
->t
& ~VT_TYPE
);
2079 /* compare function types. OLD functions match any new functions */
2080 static int is_compatible_func(CType
*type1
, CType
*type2
)
2086 if (!is_compatible_types(&s1
->type
, &s2
->type
))
2088 /* check func_call */
2089 if (FUNC_CALL(s1
->r
) != FUNC_CALL(s2
->r
))
2091 /* XXX: not complete */
2092 if (s1
->c
== FUNC_OLD
|| s2
->c
== FUNC_OLD
)
2096 while (s1
!= NULL
) {
2099 if (!is_compatible_parameter_types(&s1
->type
, &s2
->type
))
2109 /* return true if type1 and type2 are the same. If unqualified is
2110 true, qualifiers on the types are ignored.
2112 - enums are not checked as gcc __builtin_types_compatible_p ()
2114 static int compare_types(CType
*type1
, CType
*type2
, int unqualified
)
2118 t1
= type1
->t
& VT_TYPE
;
2119 t2
= type2
->t
& VT_TYPE
;
2121 /* strip qualifiers before comparing */
2122 t1
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2123 t2
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2125 /* XXX: bitfields ? */
2128 /* test more complicated cases */
2129 bt1
= t1
& VT_BTYPE
;
2130 if (bt1
== VT_PTR
) {
2131 type1
= pointed_type(type1
);
2132 type2
= pointed_type(type2
);
2133 return is_compatible_types(type1
, type2
);
2134 } else if (bt1
== VT_STRUCT
) {
2135 return (type1
->ref
== type2
->ref
);
2136 } else if (bt1
== VT_FUNC
) {
2137 return is_compatible_func(type1
, type2
);
2143 /* return true if type1 and type2 are exactly the same (including
2146 static int is_compatible_types(CType
*type1
, CType
*type2
)
2148 return compare_types(type1
,type2
,0);
2151 /* return true if type1 and type2 are the same (ignoring qualifiers).
2153 static int is_compatible_parameter_types(CType
*type1
, CType
*type2
)
2155 return compare_types(type1
,type2
,1);
2158 /* print a type. If 'varstr' is not NULL, then the variable is also
2159 printed in the type */
2161 /* XXX: add array and function pointers */
2162 static void type_to_str(char *buf
, int buf_size
,
2163 CType
*type
, const char *varstr
)
2170 t
= type
->t
& VT_TYPE
;
2173 if (t
& VT_CONSTANT
)
2174 pstrcat(buf
, buf_size
, "const ");
2175 if (t
& VT_VOLATILE
)
2176 pstrcat(buf
, buf_size
, "volatile ");
2177 if (t
& VT_UNSIGNED
)
2178 pstrcat(buf
, buf_size
, "unsigned ");
2208 tstr
= "long double";
2210 pstrcat(buf
, buf_size
, tstr
);
2214 if (bt
== VT_STRUCT
)
2218 pstrcat(buf
, buf_size
, tstr
);
2219 v
= type
->ref
->v
& ~SYM_STRUCT
;
2220 if (v
>= SYM_FIRST_ANOM
)
2221 pstrcat(buf
, buf_size
, "<anonymous>");
2223 pstrcat(buf
, buf_size
, get_tok_str(v
, NULL
));
2227 type_to_str(buf
, buf_size
, &s
->type
, varstr
);
2228 pstrcat(buf
, buf_size
, "(");
2230 while (sa
!= NULL
) {
2231 type_to_str(buf1
, sizeof(buf1
), &sa
->type
, NULL
);
2232 pstrcat(buf
, buf_size
, buf1
);
2235 pstrcat(buf
, buf_size
, ", ");
2237 pstrcat(buf
, buf_size
, ")");
2241 pstrcpy(buf1
, sizeof(buf1
), "*");
2243 pstrcat(buf1
, sizeof(buf1
), varstr
);
2244 type_to_str(buf
, buf_size
, &s
->type
, buf1
);
2248 pstrcat(buf
, buf_size
, " ");
2249 pstrcat(buf
, buf_size
, varstr
);
2254 /* verify type compatibility to store vtop in 'dt' type, and generate
2256 static void gen_assign_cast(CType
*dt
)
2258 CType
*st
, *type1
, *type2
, tmp_type1
, tmp_type2
;
2259 char buf1
[256], buf2
[256];
2262 st
= &vtop
->type
; /* source type */
2263 dbt
= dt
->t
& VT_BTYPE
;
2264 sbt
= st
->t
& VT_BTYPE
;
2266 tcc_error("Cannot assign void value");
2267 if (dt
->t
& VT_CONSTANT
)
2268 tcc_warning("assignment of read-only location");
2271 /* special cases for pointers */
2272 /* '0' can also be a pointer */
2273 if (is_null_pointer(vtop
))
2275 /* accept implicit pointer to integer cast with warning */
2276 if (is_integer_btype(sbt
)) {
2277 tcc_warning("assignment makes pointer from integer without a cast");
2280 type1
= pointed_type(dt
);
2281 /* a function is implicitely a function pointer */
2282 if (sbt
== VT_FUNC
) {
2283 if ((type1
->t
& VT_BTYPE
) != VT_VOID
&&
2284 !is_compatible_types(pointed_type(dt
), st
))
2285 tcc_warning("assignment from incompatible pointer type");
2290 type2
= pointed_type(st
);
2291 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
2292 (type2
->t
& VT_BTYPE
) == VT_VOID
) {
2293 /* void * can match anything */
2295 /* exact type match, except for unsigned */
2298 tmp_type1
.t
&= ~(VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
2299 tmp_type2
.t
&= ~(VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
2300 if (!is_compatible_types(&tmp_type1
, &tmp_type2
))
2301 tcc_warning("assignment from incompatible pointer type");
2303 /* check const and volatile */
2304 if ((!(type1
->t
& VT_CONSTANT
) && (type2
->t
& VT_CONSTANT
)) ||
2305 (!(type1
->t
& VT_VOLATILE
) && (type2
->t
& VT_VOLATILE
)))
2306 tcc_warning("assignment discards qualifiers from pointer target type");
2312 if (sbt
== VT_PTR
|| sbt
== VT_FUNC
) {
2313 tcc_warning("assignment makes integer from pointer without a cast");
2315 /* XXX: more tests */
2320 tmp_type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2321 tmp_type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2322 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
2324 type_to_str(buf1
, sizeof(buf1
), st
, NULL
);
2325 type_to_str(buf2
, sizeof(buf2
), dt
, NULL
);
2326 tcc_error("cannot cast '%s' to '%s'", buf1
, buf2
);
2334 /* store vtop in lvalue pushed on stack */
2335 ST_FUNC
void vstore(void)
2337 int sbt
, dbt
, ft
, r
, t
, size
, align
, bit_size
, bit_pos
, rc
, delayed_cast
;
2339 ft
= vtop
[-1].type
.t
;
2340 sbt
= vtop
->type
.t
& VT_BTYPE
;
2341 dbt
= ft
& VT_BTYPE
;
2342 if ((((sbt
== VT_INT
|| sbt
== VT_SHORT
) && dbt
== VT_BYTE
) ||
2343 (sbt
== VT_INT
&& dbt
== VT_SHORT
))
2344 && !(vtop
->type
.t
& VT_BITFIELD
)) {
2345 /* optimize char/short casts */
2346 delayed_cast
= VT_MUSTCAST
;
2347 vtop
->type
.t
= ft
& (VT_TYPE
& ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
)));
2348 /* XXX: factorize */
2349 if (ft
& VT_CONSTANT
)
2350 tcc_warning("assignment of read-only location");
2353 if (!(ft
& VT_BITFIELD
))
2354 gen_assign_cast(&vtop
[-1].type
);
2357 if (sbt
== VT_STRUCT
) {
2358 /* if structure, only generate pointer */
2359 /* structure assignment : generate memcpy */
2360 /* XXX: optimize if small size */
2361 if (!nocode_wanted
) {
2362 size
= type_size(&vtop
->type
, &align
);
2366 vtop
->type
.t
= VT_PTR
;
2369 /* address of memcpy() */
2372 vpush_global_sym(&func_old_type
, TOK_memcpy8
);
2373 else if(!(align
& 3))
2374 vpush_global_sym(&func_old_type
, TOK_memcpy4
);
2377 vpush_global_sym(&func_old_type
, TOK_memcpy
);
2382 vtop
->type
.t
= VT_PTR
;
2391 /* leave source on stack */
2392 } else if (ft
& VT_BITFIELD
) {
2393 /* bitfield store handling */
2394 bit_pos
= (ft
>> VT_STRUCT_SHIFT
) & 0x3f;
2395 bit_size
= (ft
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
2396 /* remove bit field info to avoid loops */
2397 vtop
[-1].type
.t
= ft
& ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
));
2399 /* duplicate source into other register */
2404 if((ft
& VT_BTYPE
) == VT_BOOL
) {
2405 gen_cast(&vtop
[-1].type
);
2406 vtop
[-1].type
.t
= (vtop
[-1].type
.t
& ~VT_BTYPE
) | (VT_BYTE
| VT_UNSIGNED
);
2409 /* duplicate destination */
2411 vtop
[-1] = vtop
[-2];
2413 /* mask and shift source */
2414 if((ft
& VT_BTYPE
) != VT_BOOL
) {
2415 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2416 vpushll((1ULL << bit_size
) - 1ULL);
2418 vpushi((1 << bit_size
) - 1);
2424 /* load destination, mask and or with source */
2426 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2427 vpushll(~(((1ULL << bit_size
) - 1ULL) << bit_pos
));
2429 vpushi(~(((1 << bit_size
) - 1) << bit_pos
));
2436 /* pop off shifted source from "duplicate source..." above */
2440 #ifdef CONFIG_TCC_BCHECK
2441 /* bound check case */
2442 if (vtop
[-1].r
& VT_MUSTBOUND
) {
2448 if (!nocode_wanted
) {
2452 #ifdef TCC_TARGET_X86_64
2453 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
2458 r
= gv(rc
); /* generate value */
2459 /* if lvalue was saved on stack, must read it */
2460 if ((vtop
[-1].r
& VT_VALMASK
) == VT_LLOCAL
) {
2462 t
= get_reg(RC_INT
);
2463 #ifdef TCC_TARGET_X86_64
2468 sv
.r
= VT_LOCAL
| VT_LVAL
;
2469 sv
.c
.ul
= vtop
[-1].c
.ul
;
2471 vtop
[-1].r
= t
| VT_LVAL
;
2474 #ifndef TCC_TARGET_X86_64
2475 /* two word case handling : store second register at word + 4 */
2476 if ((ft
& VT_BTYPE
) == VT_LLONG
) {
2478 /* convert to int to increment easily */
2479 vtop
->type
.t
= VT_INT
;
2485 /* XXX: it works because r2 is spilled last ! */
2486 store(vtop
->r2
, vtop
- 1);
2491 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
2492 vtop
->r
|= delayed_cast
;
2496 /* post defines POST/PRE add. c is the token ++ or -- */
2497 ST_FUNC
void inc(int post
, int c
)
2500 vdup(); /* save lvalue */
2502 gv_dup(); /* duplicate value */
2507 vpushi(c
- TOK_MID
);
2509 vstore(); /* store value */
2511 vpop(); /* if post op, return saved value */
2514 /* Parse GNUC __attribute__ extension. Currently, the following
2515 extensions are recognized:
2516 - aligned(n) : set data/function alignment.
2517 - packed : force data alignment to 1
2518 - section(x) : generate data/code in this section.
2519 - unused : currently ignored, but may be used someday.
2520 - regparm(n) : pass function parameters in registers (i386 only)
2522 static void parse_attribute(AttributeDef
*ad
)
2526 while (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
) {
2530 while (tok
!= ')') {
2531 if (tok
< TOK_IDENT
)
2532 expect("attribute name");
2540 expect("section name");
2541 ad
->section
= find_section(tcc_state
, (char *)tokc
.cstr
->data
);
2549 expect("alias(\"target\")");
2550 ad
->alias_target
= /* save string as token, for later */
2551 tok_alloc((char*)tokc
.cstr
->data
, tokc
.cstr
->size
-1)->tok
;
2560 if (n
<= 0 || (n
& (n
- 1)) != 0)
2561 tcc_error("alignment must be a positive power of two");
2578 /* currently, no need to handle it because tcc does not
2579 track unused objects */
2583 /* currently, no need to handle it because tcc does not
2584 track unused objects */
2589 ad
->func_call
= FUNC_CDECL
;
2594 ad
->func_call
= FUNC_STDCALL
;
2596 #ifdef TCC_TARGET_I386
2606 ad
->func_call
= FUNC_FASTCALL1
+ n
- 1;
2612 ad
->func_call
= FUNC_FASTCALLW
;
2619 ad
->mode
= VT_LLONG
+ 1;
2622 ad
->mode
= VT_SHORT
+ 1;
2625 ad
->mode
= VT_INT
+ 1;
2628 tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok
, NULL
));
2635 ad
->func_export
= 1;
2638 ad
->func_import
= 1;
2641 if (tcc_state
->warn_unsupported
)
2642 tcc_warning("'%s' attribute ignored", get_tok_str(t
, NULL
));
2643 /* skip parameters */
2645 int parenthesis
= 0;
2649 else if (tok
== ')')
2652 } while (parenthesis
&& tok
!= -1);
2665 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
2666 static void struct_decl(CType
*type
, int u
)
2668 int a
, v
, size
, align
, maxalign
, c
, offset
;
2669 int bit_size
, bit_pos
, bsize
, bt
, lbit_pos
, prevbt
;
2670 Sym
*s
, *ss
, *ass
, **ps
;
2674 a
= tok
; /* save decl type */
2679 /* struct already defined ? return it */
2681 expect("struct/union/enum name");
2685 tcc_error("invalid type");
2692 /* we put an undefined size for struct/union */
2693 s
= sym_push(v
| SYM_STRUCT
, &type1
, 0, -1);
2694 s
->r
= 0; /* default alignment is zero as gcc */
2695 /* put struct/union/enum name in type */
2703 tcc_error("struct/union/enum already defined");
2704 /* cannot be empty */
2706 /* non empty enums are not allowed */
2707 if (a
== TOK_ENUM
) {
2711 expect("identifier");
2717 /* enum symbols have static storage */
2718 ss
= sym_push(v
, &int_type
, VT_CONST
, c
);
2719 ss
->type
.t
|= VT_STATIC
;
2724 /* NOTE: we accept a trailing comma */
2735 while (tok
!= '}') {
2736 parse_btype(&btype
, &ad
);
2742 type_decl(&type1
, &ad
, &v
, TYPE_DIRECT
| TYPE_ABSTRACT
);
2743 if (v
== 0 && (type1
.t
& VT_BTYPE
) != VT_STRUCT
)
2744 expect("identifier");
2745 if ((type1
.t
& VT_BTYPE
) == VT_FUNC
||
2746 (type1
.t
& (VT_TYPEDEF
| VT_STATIC
| VT_EXTERN
| VT_INLINE
)))
2747 tcc_error("invalid type for '%s'",
2748 get_tok_str(v
, NULL
));
2752 bit_size
= expr_const();
2753 /* XXX: handle v = 0 case for messages */
2755 tcc_error("negative width in bit-field '%s'",
2756 get_tok_str(v
, NULL
));
2757 if (v
&& bit_size
== 0)
2758 tcc_error("zero width for bit-field '%s'",
2759 get_tok_str(v
, NULL
));
2761 size
= type_size(&type1
, &align
);
2763 if (align
< ad
.aligned
)
2765 } else if (ad
.packed
) {
2767 } else if (*tcc_state
->pack_stack_ptr
) {
2768 if (align
> *tcc_state
->pack_stack_ptr
)
2769 align
= *tcc_state
->pack_stack_ptr
;
2772 if (bit_size
>= 0) {
2773 bt
= type1
.t
& VT_BTYPE
;
2780 tcc_error("bitfields must have scalar type");
2782 if (bit_size
> bsize
) {
2783 tcc_error("width of '%s' exceeds its type",
2784 get_tok_str(v
, NULL
));
2785 } else if (bit_size
== bsize
) {
2786 /* no need for bit fields */
2788 } else if (bit_size
== 0) {
2789 /* XXX: what to do if only padding in a
2791 /* zero size: means to pad */
2794 /* we do not have enough room ?
2795 did the type change?
2797 if ((bit_pos
+ bit_size
) > bsize
||
2798 bt
!= prevbt
|| a
== TOK_UNION
)
2801 /* XXX: handle LSB first */
2802 type1
.t
|= VT_BITFIELD
|
2803 (bit_pos
<< VT_STRUCT_SHIFT
) |
2804 (bit_size
<< (VT_STRUCT_SHIFT
+ 6));
2805 bit_pos
+= bit_size
;
2811 if (v
!= 0 || (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
2812 /* add new memory data only if starting
2814 if (lbit_pos
== 0) {
2815 if (a
== TOK_STRUCT
) {
2816 c
= (c
+ align
- 1) & -align
;
2825 if (align
> maxalign
)
2829 printf("add field %s offset=%d",
2830 get_tok_str(v
, NULL
), offset
);
2831 if (type1
.t
& VT_BITFIELD
) {
2832 printf(" pos=%d size=%d",
2833 (type1
.t
>> VT_STRUCT_SHIFT
) & 0x3f,
2834 (type1
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f);
2839 if (v
== 0 && (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
2841 while ((ass
= ass
->next
) != NULL
) {
2842 ss
= sym_push(ass
->v
, &ass
->type
, 0, offset
+ ass
->c
);
2847 ss
= sym_push(v
| SYM_FIELD
, &type1
, 0, offset
);
2851 if (tok
== ';' || tok
== TOK_EOF
)
2858 /* store size and alignment */
2859 s
->c
= (c
+ maxalign
- 1) & -maxalign
;
2865 /* return 0 if no type declaration. otherwise, return the basic type
2868 static int parse_btype(CType
*type
, AttributeDef
*ad
)
2870 int t
, u
, type_found
, typespec_found
, typedef_found
;
2874 memset(ad
, 0, sizeof(AttributeDef
));
2882 /* currently, we really ignore extension */
2892 if ((t
& VT_BTYPE
) != 0)
2893 tcc_error("too many basic types");
2909 if ((t
& VT_BTYPE
) == VT_DOUBLE
) {
2910 #ifndef TCC_TARGET_PE
2911 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
2913 } else if ((t
& VT_BTYPE
) == VT_LONG
) {
2914 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
2928 if ((t
& VT_BTYPE
) == VT_LONG
) {
2929 #ifdef TCC_TARGET_PE
2930 t
= (t
& ~VT_BTYPE
) | VT_DOUBLE
;
2932 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
2940 struct_decl(&type1
, VT_ENUM
);
2943 type
->ref
= type1
.ref
;
2947 struct_decl(&type1
, VT_STRUCT
);
2950 /* type modifiers */
3003 /* GNUC attribute */
3004 case TOK_ATTRIBUTE1
:
3005 case TOK_ATTRIBUTE2
:
3006 parse_attribute(ad
);
3009 t
= (t
& ~VT_BTYPE
) | u
;
3017 parse_expr_type(&type1
);
3018 /* remove all storage modifiers except typedef */
3019 type1
.t
&= ~(VT_STORAGE
&~VT_TYPEDEF
);
3022 if (typespec_found
|| typedef_found
)
3025 if (!s
|| !(s
->type
.t
& VT_TYPEDEF
))
3028 t
|= (s
->type
.t
& ~VT_TYPEDEF
);
3029 type
->ref
= s
->type
.ref
;
3031 /* get attributes from typedef */
3032 if (0 == ad
->aligned
)
3033 ad
->aligned
= FUNC_ALIGN(s
->r
);
3034 if (0 == ad
->func_call
)
3035 ad
->func_call
= FUNC_CALL(s
->r
);
3036 ad
->packed
|= FUNC_PACKED(s
->r
);
3045 if ((t
& (VT_SIGNED
|VT_UNSIGNED
)) == (VT_SIGNED
|VT_UNSIGNED
))
3046 tcc_error("signed and unsigned modifier");
3047 if (tcc_state
->char_is_unsigned
) {
3048 if ((t
& (VT_SIGNED
|VT_UNSIGNED
|VT_BTYPE
)) == VT_BYTE
)
3053 /* long is never used as type */
3054 if ((t
& VT_BTYPE
) == VT_LONG
)
3055 #if !defined TCC_TARGET_X86_64 || defined TCC_TARGET_PE
3056 t
= (t
& ~VT_BTYPE
) | VT_INT
;
3058 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3064 /* convert a function parameter type (array to pointer and function to
3065 function pointer) */
3066 static inline void convert_parameter_type(CType
*pt
)
3068 /* remove const and volatile qualifiers (XXX: const could be used
3069 to indicate a const function parameter */
3070 pt
->t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3071 /* array must be transformed to pointer according to ANSI C */
3073 if ((pt
->t
& VT_BTYPE
) == VT_FUNC
) {
3078 ST_FUNC
void parse_asm_str(CString
*astr
)
3081 /* read the string */
3083 expect("string constant");
3085 while (tok
== TOK_STR
) {
3086 /* XXX: add \0 handling too ? */
3087 cstr_cat(astr
, tokc
.cstr
->data
);
3090 cstr_ccat(astr
, '\0');
3093 /* Parse an asm label and return the label
3094 * Don't forget to free the CString in the caller! */
3095 static void asm_label_instr(CString
*astr
)
3098 parse_asm_str(astr
);
3101 printf("asm_alias: \"%s\"\n", (char *)astr
->data
);
3105 static void post_type(CType
*type
, AttributeDef
*ad
)
3107 int n
, l
, t1
, arg_size
, align
;
3108 Sym
**plast
, *s
, *first
;
3113 /* function declaration */
3121 /* read param name and compute offset */
3122 if (l
!= FUNC_OLD
) {
3123 if (!parse_btype(&pt
, &ad1
)) {
3125 tcc_error("invalid type");
3132 if ((pt
.t
& VT_BTYPE
) == VT_VOID
&& tok
== ')')
3134 type_decl(&pt
, &ad1
, &n
, TYPE_DIRECT
| TYPE_ABSTRACT
);
3135 if ((pt
.t
& VT_BTYPE
) == VT_VOID
)
3136 tcc_error("parameter declared as void");
3137 arg_size
+= (type_size(&pt
, &align
) + PTR_SIZE
- 1) / PTR_SIZE
;
3142 expect("identifier");
3146 convert_parameter_type(&pt
);
3147 s
= sym_push(n
| SYM_FIELD
, &pt
, 0, 0);
3153 if (l
== FUNC_NEW
&& tok
== TOK_DOTS
) {
3160 /* if no parameters, then old type prototype */
3164 /* NOTE: const is ignored in returned type as it has a special
3165 meaning in gcc / C++ */
3166 type
->t
&= ~VT_CONSTANT
;
3167 /* some ancient pre-K&R C allows a function to return an array
3168 and the array brackets to be put after the arguments, such
3169 that "int c()[]" means something like "int[] c()" */
3172 skip(']'); /* only handle simple "[]" */
3175 /* we push a anonymous symbol which will contain the function prototype */
3176 ad
->func_args
= arg_size
;
3177 s
= sym_push(SYM_FIELD
, type
, INT_ATTR(ad
), l
);
3181 } else if (tok
== '[') {
3182 /* array definition */
3184 if (tok
== TOK_RESTRICT1
)
3189 if (!local_stack
|| nocode_wanted
)
3190 vpushi(expr_const());
3192 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3195 tcc_error("invalid array size");
3197 if (!is_integer_btype(vtop
->type
.t
& VT_BTYPE
))
3198 tcc_error("size of variable length array should be an integer");
3203 /* parse next post type */
3204 post_type(type
, ad
);
3205 t1
|= type
->t
& VT_VLA
;
3208 loc
-= type_size(&int_type
, &align
);
3212 vla_runtime_type_size(type
, &align
);
3214 vset(&int_type
, VT_LOCAL
|VT_LVAL
, loc
);
3221 /* we push an anonymous symbol which will contain the array
3223 s
= sym_push(SYM_FIELD
, type
, 0, n
);
3224 type
->t
= (t1
? VT_VLA
: VT_ARRAY
) | VT_PTR
;
3229 /* Parse a type declaration (except basic type), and return the type
3230 in 'type'. 'td' is a bitmask indicating which kind of type decl is
3231 expected. 'type' should contain the basic type. 'ad' is the
3232 attribute definition of the basic type. It can be modified by
3235 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
)
3238 CType type1
, *type2
;
3239 int qualifiers
, storage
;
3241 while (tok
== '*') {
3249 qualifiers
|= VT_CONSTANT
;
3254 qualifiers
|= VT_VOLATILE
;
3262 type
->t
|= qualifiers
;
3265 /* XXX: clarify attribute handling */
3266 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3267 parse_attribute(ad
);
3269 /* recursive type */
3270 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
3271 type1
.t
= 0; /* XXX: same as int */
3274 /* XXX: this is not correct to modify 'ad' at this point, but
3275 the syntax is not clear */
3276 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3277 parse_attribute(ad
);
3278 type_decl(&type1
, ad
, v
, td
);
3281 /* type identifier */
3282 if (tok
>= TOK_IDENT
&& (td
& TYPE_DIRECT
)) {
3286 if (!(td
& TYPE_ABSTRACT
))
3287 expect("identifier");
3291 storage
= type
->t
& VT_STORAGE
;
3292 type
->t
&= ~VT_STORAGE
;
3293 post_type(type
, ad
);
3295 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3296 parse_attribute(ad
);
3300 /* append type at the end of type1 */
3313 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
3314 ST_FUNC
int lvalue_type(int t
)
3319 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
3321 else if (bt
== VT_SHORT
)
3325 if (t
& VT_UNSIGNED
)
3326 r
|= VT_LVAL_UNSIGNED
;
3330 /* indirection with full error checking and bound check */
3331 ST_FUNC
void indir(void)
3333 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
) {
3334 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FUNC
)
3338 if ((vtop
->r
& VT_LVAL
) && !nocode_wanted
)
3340 vtop
->type
= *pointed_type(&vtop
->type
);
3341 /* Arrays and functions are never lvalues */
3342 if (!(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_VLA
)
3343 && (vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
3344 vtop
->r
|= lvalue_type(vtop
->type
.t
);
3345 /* if bound checking, the referenced pointer must be checked */
3346 #ifdef CONFIG_TCC_BCHECK
3347 if (tcc_state
->do_bounds_check
)
3348 vtop
->r
|= VT_MUSTBOUND
;
3353 /* pass a parameter to a function and do type checking and casting */
3354 static void gfunc_param_typed(Sym
*func
, Sym
*arg
)
3359 func_type
= func
->c
;
3360 if (func_type
== FUNC_OLD
||
3361 (func_type
== FUNC_ELLIPSIS
&& arg
== NULL
)) {
3362 /* default casting : only need to convert float to double */
3363 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
) {
3367 } else if (arg
== NULL
) {
3368 tcc_error("too many arguments to function");
3371 type
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
3372 gen_assign_cast(&type
);
3376 /* parse an expression of the form '(type)' or '(expr)' and return its
3378 static void parse_expr_type(CType
*type
)
3384 if (parse_btype(type
, &ad
)) {
3385 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3392 static void parse_type(CType
*type
)
3397 if (!parse_btype(type
, &ad
)) {
3400 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3403 static void vpush_tokc(int t
)
3408 vsetc(&type
, VT_CONST
, &tokc
);
3411 ST_FUNC
void unary(void)
3413 int n
, t
, align
, size
, r
, sizeof_caller
;
3417 static int in_sizeof
= 0;
3419 sizeof_caller
= in_sizeof
;
3421 /* XXX: GCC 2.95.3 does not generate a table although it should be
3435 vpush_tokc(VT_INT
| VT_UNSIGNED
);
3439 vpush_tokc(VT_LLONG
);
3443 vpush_tokc(VT_LLONG
| VT_UNSIGNED
);
3447 vpush_tokc(VT_FLOAT
);
3451 vpush_tokc(VT_DOUBLE
);
3455 vpush_tokc(VT_LDOUBLE
);
3458 case TOK___FUNCTION__
:
3460 goto tok_identifier
;
3466 /* special function name identifier */
3467 len
= strlen(funcname
) + 1;
3468 /* generate char[len] type */
3473 vpush_ref(&type
, data_section
, data_section
->data_offset
, len
);
3474 ptr
= section_ptr_add(data_section
, len
);
3475 memcpy(ptr
, funcname
, len
);
3480 #ifdef TCC_TARGET_PE
3481 t
= VT_SHORT
| VT_UNSIGNED
;
3487 /* string parsing */
3490 if (tcc_state
->warn_write_strings
)
3495 memset(&ad
, 0, sizeof(AttributeDef
));
3496 decl_initializer_alloc(&type
, &ad
, VT_CONST
, 2, 0, NULL
, 0);
3501 if (parse_btype(&type
, &ad
)) {
3502 type_decl(&type
, &ad
, &n
, TYPE_ABSTRACT
);
3504 /* check ISOC99 compound literal */
3506 /* data is allocated locally by default */
3511 /* all except arrays are lvalues */
3512 if (!(type
.t
& VT_ARRAY
))
3513 r
|= lvalue_type(type
.t
);
3514 memset(&ad
, 0, sizeof(AttributeDef
));
3515 decl_initializer_alloc(&type
, &ad
, r
, 1, 0, NULL
, 0);
3517 if (sizeof_caller
) {
3524 } else if (tok
== '{') {
3525 /* save all registers */
3527 /* statement expression : we do not accept break/continue
3528 inside as GCC does */
3529 block(NULL
, NULL
, NULL
, NULL
, 0, 1);
3544 /* functions names must be treated as function pointers,
3545 except for unary '&' and sizeof. Since we consider that
3546 functions are not lvalues, we only have to handle it
3547 there and in function calls. */
3548 /* arrays can also be used although they are not lvalues */
3549 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
&&
3550 !(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_LLOCAL
))
3552 mk_pointer(&vtop
->type
);
3558 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3560 boolean
.t
= VT_BOOL
;
3562 vtop
->c
.i
= !vtop
->c
.i
;
3563 } else if ((vtop
->r
& VT_VALMASK
) == VT_CMP
)
3564 vtop
->c
.i
= vtop
->c
.i
^ 1;
3567 vseti(VT_JMP
, gtst(1, 0));
3578 /* in order to force cast, we add zero */
3580 if ((vtop
->type
.t
& VT_BTYPE
) == VT_PTR
)
3581 tcc_error("pointer not accepted for unary plus");
3591 unary_type(&type
); // Perform a in_sizeof = 0;
3592 size
= type_size(&type
, &align
);
3593 if (t
== TOK_SIZEOF
) {
3594 if (!(type
.t
& VT_VLA
)) {
3596 tcc_error("sizeof applied to an incomplete type");
3599 vla_runtime_type_size(&type
, &align
);
3604 vtop
->type
.t
|= VT_UNSIGNED
;
3607 case TOK_builtin_types_compatible_p
:
3616 type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3617 type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3618 vpushi(is_compatible_types(&type1
, &type2
));
3621 case TOK_builtin_constant_p
:
3623 int saved_nocode_wanted
, res
;
3626 saved_nocode_wanted
= nocode_wanted
;
3629 res
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
3631 nocode_wanted
= saved_nocode_wanted
;
3636 case TOK_builtin_frame_address
:
3641 if (tok
!= TOK_CINT
) {
3642 tcc_error("__builtin_frame_address only takes integers");
3645 tcc_error("TCC only supports __builtin_frame_address(0)");
3651 vset(&type
, VT_LOCAL
, 0);
3654 #ifdef TCC_TARGET_X86_64
3655 case TOK_builtin_va_arg_types
:
3657 /* This definition must be synced with stdarg.h */
3658 enum __va_arg_type
{
3659 __va_gen_reg
, __va_float_reg
, __va_stack
3667 bt
= type
.t
& VT_BTYPE
;
3668 if (bt
== VT_STRUCT
|| bt
== VT_LDOUBLE
) {
3670 } else if (bt
== VT_FLOAT
|| bt
== VT_DOUBLE
) {
3671 vpushi(__va_float_reg
);
3673 vpushi(__va_gen_reg
);
3693 goto tok_identifier
;
3695 /* allow to take the address of a label */
3696 if (tok
< TOK_UIDENT
)
3697 expect("label identifier");
3698 s
= label_find(tok
);
3700 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
3702 if (s
->r
== LABEL_DECLARED
)
3703 s
->r
= LABEL_FORWARD
;
3706 s
->type
.t
= VT_VOID
;
3707 mk_pointer(&s
->type
);
3708 s
->type
.t
|= VT_STATIC
;
3710 vset(&s
->type
, VT_CONST
| VT_SYM
, 0);
3715 // special qnan , snan and infinity values
3717 vpush64(VT_DOUBLE
, 0x7ff8000000000000ULL
);
3721 vpush64(VT_DOUBLE
, 0x7ff0000000000001ULL
);
3725 vpush64(VT_DOUBLE
, 0x7ff0000000000000ULL
);
3734 expect("identifier");
3738 tcc_error("'%s' undeclared", get_tok_str(t
, NULL
));
3739 /* for simple function calls, we tolerate undeclared
3740 external reference to int() function */
3741 if (tcc_state
->warn_implicit_function_declaration
)
3742 tcc_warning("implicit declaration of function '%s'",
3743 get_tok_str(t
, NULL
));
3744 s
= external_global_sym(t
, &func_old_type
, 0);
3746 if ((s
->type
.t
& (VT_STATIC
| VT_INLINE
| VT_BTYPE
)) ==
3747 (VT_STATIC
| VT_INLINE
| VT_FUNC
)) {
3748 /* if referencing an inline function, then we generate a
3749 symbol to it if not already done. It will have the
3750 effect to generate code for it at the end of the
3751 compilation unit. Inline function as always
3752 generated in the text section. */
3754 put_extern_sym(s
, text_section
, 0, 0);
3755 r
= VT_SYM
| VT_CONST
;
3759 vset(&s
->type
, r
, s
->c
);
3760 /* if forward reference, we must point to s */
3761 if (vtop
->r
& VT_SYM
) {
3768 /* post operations */
3770 if (tok
== TOK_INC
|| tok
== TOK_DEC
) {
3773 } else if (tok
== '.' || tok
== TOK_ARROW
) {
3776 if (tok
== TOK_ARROW
)
3778 qualifiers
= vtop
->type
.t
& (VT_CONSTANT
| VT_VOLATILE
);
3782 /* expect pointer on structure */
3783 if ((vtop
->type
.t
& VT_BTYPE
) != VT_STRUCT
)
3784 expect("struct or union");
3788 while ((s
= s
->next
) != NULL
) {
3793 tcc_error("field not found: %s", get_tok_str(tok
& ~SYM_FIELD
, NULL
));
3794 /* add field offset to pointer */
3795 vtop
->type
= char_pointer_type
; /* change type to 'char *' */
3798 /* change type to field type, and set to lvalue */
3799 vtop
->type
= s
->type
;
3800 vtop
->type
.t
|= qualifiers
;
3801 /* an array is never an lvalue */
3802 if (!(vtop
->type
.t
& VT_ARRAY
)) {
3803 vtop
->r
|= lvalue_type(vtop
->type
.t
);
3804 #ifdef CONFIG_TCC_BCHECK
3805 /* if bound checking, the referenced pointer must be checked */
3806 if (tcc_state
->do_bounds_check
)
3807 vtop
->r
|= VT_MUSTBOUND
;
3811 } else if (tok
== '[') {
3817 } else if (tok
== '(') {
3823 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
3824 /* pointer test (no array accepted) */
3825 if ((vtop
->type
.t
& (VT_BTYPE
| VT_ARRAY
)) == VT_PTR
) {
3826 vtop
->type
= *pointed_type(&vtop
->type
);
3827 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
)
3831 expect("function pointer");
3834 vtop
->r
&= ~VT_LVAL
; /* no lvalue */
3836 /* get return type */
3839 sa
= s
->next
; /* first parameter */
3842 /* compute first implicit argument if a structure is returned */
3843 if ((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
3844 /* get some space for the returned structure */
3845 size
= type_size(&s
->type
, &align
);
3846 loc
= (loc
- size
) & -align
;
3848 ret
.r
= VT_LOCAL
| VT_LVAL
;
3849 /* pass it as 'int' to avoid structure arg passing
3851 vseti(VT_LOCAL
, loc
);
3856 /* return in register */
3857 if (is_float(ret
.type
.t
)) {
3858 ret
.r
= reg_fret(ret
.type
.t
);
3860 if ((ret
.type
.t
& VT_BTYPE
) == VT_LLONG
)
3869 gfunc_param_typed(s
, sa
);
3879 tcc_error("too few arguments to function");
3881 if (!nocode_wanted
) {
3882 gfunc_call(nb_args
);
3884 vtop
-= (nb_args
+ 1);
3887 vsetc(&ret
.type
, ret
.r
, &ret
.c
);
3895 ST_FUNC
void expr_prod(void)
3900 while (tok
== '*' || tok
== '/' || tok
== '%') {
3908 ST_FUNC
void expr_sum(void)
3913 while (tok
== '+' || tok
== '-') {
3921 static void expr_shift(void)
3926 while (tok
== TOK_SHL
|| tok
== TOK_SAR
) {
3934 static void expr_cmp(void)
3939 while ((tok
>= TOK_ULE
&& tok
<= TOK_GT
) ||
3940 tok
== TOK_ULT
|| tok
== TOK_UGE
) {
3948 static void expr_cmpeq(void)
3953 while (tok
== TOK_EQ
|| tok
== TOK_NE
) {
3961 static void expr_and(void)
3964 while (tok
== '&') {
3971 static void expr_xor(void)
3974 while (tok
== '^') {
3981 static void expr_or(void)
3984 while (tok
== '|') {
3991 /* XXX: fix this mess */
3992 static void expr_land_const(void)
3995 while (tok
== TOK_LAND
) {
4002 /* XXX: fix this mess */
4003 static void expr_lor_const(void)
4006 while (tok
== TOK_LOR
) {
4013 /* only used if non constant */
4014 static void expr_land(void)
4019 if (tok
== TOK_LAND
) {
4024 if (tok
!= TOK_LAND
) {
4034 static void expr_lor(void)
4039 if (tok
== TOK_LOR
) {
4044 if (tok
!= TOK_LOR
) {
4054 /* XXX: better constant handling */
4055 static void expr_cond(void)
4057 int tt
, u
, r1
, r2
, rc
, t1
, t2
, bt1
, bt2
;
4059 CType type
, type1
, type2
;
4066 boolean
.t
= VT_BOOL
;
4072 if (tok
!= ':' || !gnu_ext
) {
4087 if (vtop
!= vstack
) {
4088 /* needed to avoid having different registers saved in
4090 if (is_float(vtop
->type
.t
)) {
4092 #ifdef TCC_TARGET_X86_64
4093 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4103 if (tok
== ':' && gnu_ext
) {
4111 sv
= *vtop
; /* save value to handle it later */
4112 vtop
--; /* no vpop so that FP stack is not flushed */
4120 bt1
= t1
& VT_BTYPE
;
4122 bt2
= t2
& VT_BTYPE
;
4123 /* cast operands to correct type according to ISOC rules */
4124 if (is_float(bt1
) || is_float(bt2
)) {
4125 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
4126 type
.t
= VT_LDOUBLE
;
4127 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
4132 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
4133 /* cast to biggest op */
4135 /* convert to unsigned if it does not fit in a long long */
4136 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
4137 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
4138 type
.t
|= VT_UNSIGNED
;
4139 } else if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
4140 /* If one is a null ptr constant the result type
4142 if (is_null_pointer (vtop
))
4144 else if (is_null_pointer (&sv
))
4146 /* XXX: test pointer compatibility, C99 has more elaborate
4150 } else if (bt1
== VT_FUNC
|| bt2
== VT_FUNC
) {
4151 /* XXX: test function pointer compatibility */
4152 type
= bt1
== VT_FUNC
? type1
: type2
;
4153 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
4154 /* XXX: test structure compatibility */
4155 type
= bt1
== VT_STRUCT
? type1
: type2
;
4156 } else if (bt1
== VT_VOID
|| bt2
== VT_VOID
) {
4157 /* NOTE: as an extension, we accept void on only one side */
4160 /* integer operations */
4162 /* convert to unsigned if it does not fit in an integer */
4163 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
4164 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
4165 type
.t
|= VT_UNSIGNED
;
4168 /* now we convert second operand */
4170 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4173 if (is_float(type
.t
)) {
4175 #ifdef TCC_TARGET_X86_64
4176 if ((type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4180 } else if ((type
.t
& VT_BTYPE
) == VT_LLONG
) {
4181 /* for long longs, we use fixed registers to avoid having
4182 to handle a complicated move */
4187 /* this is horrible, but we must also convert first
4191 /* put again first value and cast it */
4194 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4204 static void expr_eq(void)
4210 (tok
>= TOK_A_MOD
&& tok
<= TOK_A_DIV
) ||
4211 tok
== TOK_A_XOR
|| tok
== TOK_A_OR
||
4212 tok
== TOK_A_SHL
|| tok
== TOK_A_SAR
) {
4227 ST_FUNC
void gexpr(void)
4238 /* parse an expression and return its type without any side effect. */
4239 static void expr_type(CType
*type
)
4241 int saved_nocode_wanted
;
4243 saved_nocode_wanted
= nocode_wanted
;
4248 nocode_wanted
= saved_nocode_wanted
;
4251 /* parse a unary expression and return its type without any side
4253 static void unary_type(CType
*type
)
4265 /* parse a constant expression and return value in vtop. */
4266 static void expr_const1(void)
4275 /* parse an integer constant and return its value. */
4276 ST_FUNC
int expr_const(void)
4280 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
4281 expect("constant expression");
4287 /* return the label token if current token is a label, otherwise
4289 static int is_label(void)
4293 /* fast test first */
4294 if (tok
< TOK_UIDENT
)
4296 /* no need to save tokc because tok is an identifier */
4303 unget_tok(last_tok
);
4308 static void label_or_decl(int l
)
4312 /* fast test first */
4313 if (tok
>= TOK_UIDENT
)
4315 /* no need to save tokc because tok is an identifier */
4319 unget_tok(last_tok
);
4322 unget_tok(last_tok
);
4327 static void block(int *bsym
, int *csym
, int *case_sym
, int *def_sym
,
4328 int case_reg
, int is_expr
)
4333 /* generate line number info */
4334 if (tcc_state
->do_debug
&&
4335 (last_line_num
!= file
->line_num
|| last_ind
!= ind
)) {
4336 put_stabn(N_SLINE
, 0, file
->line_num
, ind
- func_ind
);
4338 last_line_num
= file
->line_num
;
4342 /* default return value is (void) */
4344 vtop
->type
.t
= VT_VOID
;
4347 if (tok
== TOK_IF
) {
4354 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4356 if (c
== TOK_ELSE
) {
4360 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4361 gsym(d
); /* patch else jmp */
4364 } else if (tok
== TOK_WHILE
) {
4372 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4376 } else if (tok
== '{') {
4380 /* record local declaration stack position */
4382 llabel
= local_label_stack
;
4383 /* handle local labels declarations */
4384 if (tok
== TOK_LABEL
) {
4387 if (tok
< TOK_UIDENT
)
4388 expect("label identifier");
4389 label_push(&local_label_stack
, tok
, LABEL_DECLARED
);
4399 while (tok
!= '}') {
4400 label_or_decl(VT_LOCAL
);
4404 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
4407 /* pop locally defined labels */
4408 label_pop(&local_label_stack
, llabel
);
4410 /* XXX: this solution makes only valgrind happy...
4411 triggered by gcc.c-torture/execute/20000917-1.c */
4413 switch(vtop
->type
.t
& VT_BTYPE
) {
4418 for(p
=vtop
->type
.ref
;p
;p
=p
->prev
)
4420 tcc_error("unsupported expression type");
4423 /* pop locally defined symbols */
4424 sym_pop(&local_stack
, s
);
4426 } else if (tok
== TOK_RETURN
) {
4430 gen_assign_cast(&func_vt
);
4431 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
4433 /* if returning structure, must copy it to implicit
4434 first pointer arg location */
4437 size
= type_size(&func_vt
,&align
);
4440 if((vtop
->r
!= (VT_LOCAL
| VT_LVAL
) || (vtop
->c
.i
& 3))
4444 loc
= (loc
- size
) & -4;
4447 vset(&type
, VT_LOCAL
| VT_LVAL
, addr
);
4450 vset(&int_type
, VT_LOCAL
| VT_LVAL
, addr
);
4452 vtop
->type
= int_type
;
4458 vset(&type
, VT_LOCAL
| VT_LVAL
, func_vc
);
4461 /* copy structure value to pointer */
4466 } else if (is_float(func_vt
.t
)) {
4467 gv(rc_fret(func_vt
.t
));
4471 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
4474 rsym
= gjmp(rsym
); /* jmp */
4475 } else if (tok
== TOK_BREAK
) {
4478 tcc_error("cannot break");
4479 *bsym
= gjmp(*bsym
);
4482 } else if (tok
== TOK_CONTINUE
) {
4485 tcc_error("cannot continue");
4486 *csym
= gjmp(*csym
);
4489 } else if (tok
== TOK_FOR
) {
4495 /* c99 for-loop init decl? */
4496 if (!decl0(VT_LOCAL
, 1)) {
4497 /* no, regular for-loop init expr */
4521 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4525 sym_pop(&local_stack
, s
);
4527 if (tok
== TOK_DO
) {
4532 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4543 if (tok
== TOK_SWITCH
) {
4547 /* XXX: other types than integer */
4548 case_reg
= gv(RC_INT
);
4552 b
= gjmp(0); /* jump to first case */
4554 block(&a
, csym
, &b
, &c
, case_reg
, 0);
4555 /* if no default, jmp after switch */
4563 if (tok
== TOK_CASE
) {
4570 if (gnu_ext
&& tok
== TOK_DOTS
) {
4574 tcc_warning("empty case range");
4576 /* since a case is like a label, we must skip it with a jmp */
4583 *case_sym
= gtst(1, 0);
4586 *case_sym
= gtst(1, 0);
4590 *case_sym
= gtst(1, *case_sym
);
4595 goto block_after_label
;
4597 if (tok
== TOK_DEFAULT
) {
4603 tcc_error("too many 'default'");
4606 goto block_after_label
;
4608 if (tok
== TOK_GOTO
) {
4610 if (tok
== '*' && gnu_ext
) {
4614 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
)
4617 } else if (tok
>= TOK_UIDENT
) {
4618 s
= label_find(tok
);
4619 /* put forward definition if needed */
4621 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
4623 if (s
->r
== LABEL_DECLARED
)
4624 s
->r
= LABEL_FORWARD
;
4626 /* label already defined */
4627 if (s
->r
& LABEL_FORWARD
)
4628 s
->jnext
= gjmp(s
->jnext
);
4630 gjmp_addr(s
->jnext
);
4633 expect("label identifier");
4636 } else if (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
) {
4644 if (s
->r
== LABEL_DEFINED
)
4645 tcc_error("duplicate label '%s'", get_tok_str(s
->v
, NULL
));
4647 s
->r
= LABEL_DEFINED
;
4649 s
= label_push(&global_label_stack
, b
, LABEL_DEFINED
);
4652 /* we accept this, but it is a mistake */
4655 tcc_warning("deprecated use of label at end of compound statement");
4659 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
4662 /* expression case */
4677 /* t is the array or struct type. c is the array or struct
4678 address. cur_index/cur_field is the pointer to the current
4679 value. 'size_only' is true if only size info is needed (only used
4681 static void decl_designator(CType
*type
, Section
*sec
, unsigned long c
,
4682 int *cur_index
, Sym
**cur_field
,
4686 int notfirst
, index
, index_last
, align
, l
, nb_elems
, elem_size
;
4692 if (gnu_ext
&& (l
= is_label()) != 0)
4694 while (tok
== '[' || tok
== '.') {
4696 if (!(type
->t
& VT_ARRAY
))
4697 expect("array type");
4700 index
= expr_const();
4701 if (index
< 0 || (s
->c
>= 0 && index
>= s
->c
))
4702 expect("invalid index");
4703 if (tok
== TOK_DOTS
&& gnu_ext
) {
4705 index_last
= expr_const();
4706 if (index_last
< 0 ||
4707 (s
->c
>= 0 && index_last
>= s
->c
) ||
4709 expect("invalid index");
4715 *cur_index
= index_last
;
4716 type
= pointed_type(type
);
4717 elem_size
= type_size(type
, &align
);
4718 c
+= index
* elem_size
;
4719 /* NOTE: we only support ranges for last designator */
4720 nb_elems
= index_last
- index
+ 1;
4721 if (nb_elems
!= 1) {
4730 if ((type
->t
& VT_BTYPE
) != VT_STRUCT
)
4731 expect("struct/union type");
4744 /* XXX: fix this mess by using explicit storage field */
4746 type1
.t
|= (type
->t
& ~VT_TYPE
);
4760 if (type
->t
& VT_ARRAY
) {
4762 type
= pointed_type(type
);
4763 c
+= index
* type_size(type
, &align
);
4767 tcc_error("too many field init");
4768 /* XXX: fix this mess by using explicit storage field */
4770 type1
.t
|= (type
->t
& ~VT_TYPE
);
4775 decl_initializer(type
, sec
, c
, 0, size_only
);
4777 /* XXX: make it more general */
4778 if (!size_only
&& nb_elems
> 1) {
4779 unsigned long c_end
;
4784 tcc_error("range init not supported yet for dynamic storage");
4785 c_end
= c
+ nb_elems
* elem_size
;
4786 if (c_end
> sec
->data_allocated
)
4787 section_realloc(sec
, c_end
);
4788 src
= sec
->data
+ c
;
4790 for(i
= 1; i
< nb_elems
; i
++) {
4792 memcpy(dst
, src
, elem_size
);
4798 #define EXPR_CONST 1
4801 /* store a value or an expression directly in global data or in local array */
4802 static void init_putv(CType
*type
, Section
*sec
, unsigned long c
,
4803 int v
, int expr_type
)
4805 int saved_global_expr
, bt
, bit_pos
, bit_size
;
4807 unsigned long long bit_mask
;
4815 /* compound literals must be allocated globally in this case */
4816 saved_global_expr
= global_expr
;
4819 global_expr
= saved_global_expr
;
4820 /* NOTE: symbols are accepted */
4821 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) != VT_CONST
)
4822 tcc_error("initializer element is not constant");
4830 dtype
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
4833 /* XXX: not portable */
4834 /* XXX: generate error if incorrect relocation */
4835 gen_assign_cast(&dtype
);
4836 bt
= type
->t
& VT_BTYPE
;
4837 /* we'll write at most 12 bytes */
4838 if (c
+ 12 > sec
->data_allocated
) {
4839 section_realloc(sec
, c
+ 12);
4841 ptr
= sec
->data
+ c
;
4842 /* XXX: make code faster ? */
4843 if (!(type
->t
& VT_BITFIELD
)) {
4848 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
4849 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
4850 bit_mask
= (1LL << bit_size
) - 1;
4852 if ((vtop
->r
& VT_SYM
) &&
4858 (bt
== VT_INT
&& bit_size
!= 32)))
4859 tcc_error("initializer element is not computable at load time");
4862 vtop
->c
.i
= (vtop
->c
.i
!= 0);
4864 *(char *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
4867 *(short *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
4870 *(double *)ptr
= vtop
->c
.d
;
4873 *(long double *)ptr
= vtop
->c
.ld
;
4876 *(long long *)ptr
|= (vtop
->c
.ll
& bit_mask
) << bit_pos
;
4879 if (vtop
->r
& VT_SYM
) {
4880 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
4882 *(int *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
4887 vset(&dtype
, VT_LOCAL
|VT_LVAL
, c
);
4894 /* put zeros for variable based init */
4895 static void init_putz(CType
*t
, Section
*sec
, unsigned long c
, int size
)
4898 /* nothing to do because globals are already set to zero */
4900 vpush_global_sym(&func_old_type
, TOK_memset
);
4908 /* 't' contains the type and storage info. 'c' is the offset of the
4909 object in section 'sec'. If 'sec' is NULL, it means stack based
4910 allocation. 'first' is true if array '{' must be read (multi
4911 dimension implicit array init handling). 'size_only' is true if
4912 size only evaluation is wanted (only for arrays). */
4913 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
,
4914 int first
, int size_only
)
4916 int index
, array_length
, n
, no_oblock
, nb
, parlevel
, parlevel1
, i
;
4917 int size1
, align1
, expr_type
;
4921 if (type
->t
& VT_VLA
) {
4922 #if defined TCC_TARGET_I386 || defined TCC_TARGET_X86_64
4926 vpush_global_sym(&func_old_type
, TOK_alloca
);
4927 vla_runtime_type_size(type
, &a
);
4932 vsetc(type
, REG_IRET
, &retcval
);
4933 vset(type
, VT_LOCAL
|VT_LVAL
, c
);
4938 tcc_error("variable length arrays unsupported for this target");
4940 } else if (type
->t
& VT_ARRAY
) {
4944 t1
= pointed_type(type
);
4945 size1
= type_size(t1
, &align1
);
4948 if ((first
&& tok
!= TOK_LSTR
&& tok
!= TOK_STR
) ||
4951 tcc_error("character array initializer must be a literal,"
4952 " optionally enclosed in braces");
4957 /* only parse strings here if correct type (otherwise: handle
4958 them as ((w)char *) expressions */
4959 if ((tok
== TOK_LSTR
&&
4960 #ifdef TCC_TARGET_PE
4961 (t1
->t
& VT_BTYPE
) == VT_SHORT
&& (t1
->t
& VT_UNSIGNED
)
4963 (t1
->t
& VT_BTYPE
) == VT_INT
4965 ) || (tok
== TOK_STR
&& (t1
->t
& VT_BTYPE
) == VT_BYTE
)) {
4966 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
4971 /* compute maximum number of chars wanted */
4973 cstr_len
= cstr
->size
;
4975 cstr_len
= cstr
->size
/ sizeof(nwchar_t
);
4978 if (n
>= 0 && nb
> (n
- array_length
))
4979 nb
= n
- array_length
;
4982 tcc_warning("initializer-string for array is too long");
4983 /* in order to go faster for common case (char
4984 string in global variable, we handle it
4986 if (sec
&& tok
== TOK_STR
&& size1
== 1) {
4987 memcpy(sec
->data
+ c
+ array_length
, cstr
->data
, nb
);
4991 ch
= ((unsigned char *)cstr
->data
)[i
];
4993 ch
= ((nwchar_t
*)cstr
->data
)[i
];
4994 init_putv(t1
, sec
, c
+ (array_length
+ i
) * size1
,
5002 /* only add trailing zero if enough storage (no
5003 warning in this case since it is standard) */
5004 if (n
< 0 || array_length
< n
) {
5006 init_putv(t1
, sec
, c
+ (array_length
* size1
), 0, EXPR_VAL
);
5012 while (tok
!= '}') {
5013 decl_designator(type
, sec
, c
, &index
, NULL
, size_only
);
5014 if (n
>= 0 && index
>= n
)
5015 tcc_error("index too large");
5016 /* must put zero in holes (note that doing it that way
5017 ensures that it even works with designators) */
5018 if (!size_only
&& array_length
< index
) {
5019 init_putz(t1
, sec
, c
+ array_length
* size1
,
5020 (index
- array_length
) * size1
);
5023 if (index
> array_length
)
5024 array_length
= index
;
5025 /* special test for multi dimensional arrays (may not
5026 be strictly correct if designators are used at the
5028 if (index
>= n
&& no_oblock
)
5037 /* put zeros at the end */
5038 if (!size_only
&& n
>= 0 && array_length
< n
) {
5039 init_putz(t1
, sec
, c
+ array_length
* size1
,
5040 (n
- array_length
) * size1
);
5042 /* patch type size if needed */
5044 s
->c
= array_length
;
5045 } else if ((type
->t
& VT_BTYPE
) == VT_STRUCT
&&
5046 (sec
|| !first
|| tok
== '{')) {
5049 /* NOTE: the previous test is a specific case for automatic
5050 struct/union init */
5051 /* XXX: union needs only one init */
5053 /* XXX: this test is incorrect for local initializers
5054 beginning with ( without {. It would be much more difficult
5055 to do it correctly (ideally, the expression parser should
5056 be used in all cases) */
5062 while (tok
== '(') {
5066 if (!parse_btype(&type1
, &ad1
))
5068 type_decl(&type1
, &ad1
, &n
, TYPE_ABSTRACT
);
5070 if (!is_assignable_types(type
, &type1
))
5071 tcc_error("invalid type for cast");
5076 if (first
|| tok
== '{') {
5085 while (tok
!= '}') {
5086 decl_designator(type
, sec
, c
, NULL
, &f
, size_only
);
5088 if (!size_only
&& array_length
< index
) {
5089 init_putz(type
, sec
, c
+ array_length
,
5090 index
- array_length
);
5092 index
= index
+ type_size(&f
->type
, &align1
);
5093 if (index
> array_length
)
5094 array_length
= index
;
5096 /* gr: skip fields from same union - ugly. */
5098 ///printf("index: %2d %08x -- %2d %08x\n", f->c, f->type.t, f->next->c, f->next->type.t);
5099 /* test for same offset */
5100 if (f
->next
->c
!= f
->c
)
5102 /* if yes, test for bitfield shift */
5103 if ((f
->type
.t
& VT_BITFIELD
) && (f
->next
->type
.t
& VT_BITFIELD
)) {
5104 int bit_pos_1
= (f
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5105 int bit_pos_2
= (f
->next
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5106 //printf("bitfield %d %d\n", bit_pos_1, bit_pos_2);
5107 if (bit_pos_1
!= bit_pos_2
)
5114 if (no_oblock
&& f
== NULL
)
5120 /* put zeros at the end */
5121 if (!size_only
&& array_length
< n
) {
5122 init_putz(type
, sec
, c
+ array_length
,
5131 } else if (tok
== '{') {
5133 decl_initializer(type
, sec
, c
, first
, size_only
);
5135 } else if (size_only
) {
5136 /* just skip expression */
5137 parlevel
= parlevel1
= 0;
5138 while ((parlevel
> 0 || parlevel1
> 0 ||
5139 (tok
!= '}' && tok
!= ',')) && tok
!= -1) {
5142 else if (tok
== ')')
5144 else if (tok
== '{')
5146 else if (tok
== '}')
5151 /* currently, we always use constant expression for globals
5152 (may change for scripting case) */
5153 expr_type
= EXPR_CONST
;
5155 expr_type
= EXPR_ANY
;
5156 init_putv(type
, sec
, c
, 0, expr_type
);
5160 /* parse an initializer for type 't' if 'has_init' is non zero, and
5161 allocate space in local or global data space ('r' is either
5162 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
5163 variable 'v' with an associated name represented by 'asm_label' of
5164 scope 'scope' is declared before initializers are parsed. If 'v' is
5165 zero, then a reference to the new object is put in the value stack.
5166 If 'has_init' is 2, a special parsing is done to handle string
5168 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
,
5169 int has_init
, int v
, char *asm_label
,
5172 int size
, align
, addr
, data_offset
;
5174 ParseState saved_parse_state
= {0};
5175 TokenString init_str
;
5177 Sym
*flexible_array
;
5179 flexible_array
= NULL
;
5180 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
5183 while (field
&& field
->next
)
5184 field
= field
->next
;
5185 if (field
->type
.t
& VT_ARRAY
&& field
->type
.ref
->c
< 0)
5186 flexible_array
= field
;
5189 size
= type_size(type
, &align
);
5190 /* If unknown size, we must evaluate it before
5191 evaluating initializers because
5192 initializers can generate global data too
5193 (e.g. string pointers or ISOC99 compound
5194 literals). It also simplifies local
5195 initializers handling */
5196 tok_str_new(&init_str
);
5197 if (size
< 0 || (flexible_array
&& has_init
)) {
5199 tcc_error("unknown type size");
5200 /* get all init string */
5201 if (has_init
== 2) {
5202 /* only get strings */
5203 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5204 tok_str_add_tok(&init_str
);
5209 while (level
> 0 || (tok
!= ',' && tok
!= ';')) {
5211 tcc_error("unexpected end of file in initializer");
5212 tok_str_add_tok(&init_str
);
5215 else if (tok
== '}') {
5225 tok_str_add(&init_str
, -1);
5226 tok_str_add(&init_str
, 0);
5229 save_parse_state(&saved_parse_state
);
5231 macro_ptr
= init_str
.str
;
5233 decl_initializer(type
, NULL
, 0, 1, 1);
5234 /* prepare second initializer parsing */
5235 macro_ptr
= init_str
.str
;
5238 /* if still unknown size, error */
5239 size
= type_size(type
, &align
);
5241 tcc_error("unknown type size");
5244 size
+= flexible_array
->type
.ref
->c
* pointed_size(&flexible_array
->type
);
5245 /* take into account specified alignment if bigger */
5247 if (ad
->aligned
> align
)
5248 align
= ad
->aligned
;
5249 } else if (ad
->packed
) {
5252 if ((r
& VT_VALMASK
) == VT_LOCAL
) {
5254 #ifdef CONFIG_TCC_BCHECK
5255 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5259 loc
= (loc
- size
) & -align
;
5261 #ifdef CONFIG_TCC_BCHECK
5262 /* handles bounds */
5263 /* XXX: currently, since we do only one pass, we cannot track
5264 '&' operators, so we add only arrays */
5265 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5266 unsigned long *bounds_ptr
;
5267 /* add padding between regions */
5269 /* then add local bound info */
5270 bounds_ptr
= section_ptr_add(lbounds_section
, 2 * sizeof(unsigned long));
5271 bounds_ptr
[0] = addr
;
5272 bounds_ptr
[1] = size
;
5276 /* local variable */
5277 sym_push(v
, type
, r
, addr
);
5279 /* push local reference */
5280 vset(type
, r
, addr
);
5286 if (v
&& scope
== VT_CONST
) {
5287 /* see if the symbol was already defined */
5290 if (!is_compatible_types(&sym
->type
, type
))
5291 tcc_error("incompatible types for redefinition of '%s'",
5292 get_tok_str(v
, NULL
));
5293 if (sym
->type
.t
& VT_EXTERN
) {
5294 /* if the variable is extern, it was not allocated */
5295 sym
->type
.t
&= ~VT_EXTERN
;
5296 /* set array size if it was ommited in extern
5298 if ((sym
->type
.t
& VT_ARRAY
) &&
5299 sym
->type
.ref
->c
< 0 &&
5301 sym
->type
.ref
->c
= type
->ref
->c
;
5303 /* we accept several definitions of the same
5304 global variable. this is tricky, because we
5305 must play with the SHN_COMMON type of the symbol */
5306 /* XXX: should check if the variable was already
5307 initialized. It is incorrect to initialized it
5309 /* no init data, we won't add more to the symbol */
5316 /* allocate symbol in corresponding section */
5321 else if (tcc_state
->nocommon
)
5325 data_offset
= sec
->data_offset
;
5326 data_offset
= (data_offset
+ align
- 1) & -align
;
5328 /* very important to increment global pointer at this time
5329 because initializers themselves can create new initializers */
5330 data_offset
+= size
;
5331 #ifdef CONFIG_TCC_BCHECK
5332 /* add padding if bound check */
5333 if (tcc_state
->do_bounds_check
)
5336 sec
->data_offset
= data_offset
;
5337 /* allocate section space to put the data */
5338 if (sec
->sh_type
!= SHT_NOBITS
&&
5339 data_offset
> sec
->data_allocated
)
5340 section_realloc(sec
, data_offset
);
5341 /* align section if needed */
5342 if (align
> sec
->sh_addralign
)
5343 sec
->sh_addralign
= align
;
5345 addr
= 0; /* avoid warning */
5349 if (scope
!= VT_CONST
|| !sym
) {
5350 sym
= sym_push(v
, type
, r
| VT_SYM
, 0);
5351 sym
->asm_label
= asm_label
;
5353 /* update symbol definition */
5355 put_extern_sym(sym
, sec
, addr
, size
);
5358 /* put a common area */
5359 put_extern_sym(sym
, NULL
, align
, size
);
5360 /* XXX: find a nicer way */
5361 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
5362 esym
->st_shndx
= SHN_COMMON
;
5367 /* push global reference */
5368 sym
= get_sym_ref(type
, sec
, addr
, size
);
5370 vsetc(type
, VT_CONST
| VT_SYM
, &cval
);
5373 /* patch symbol weakness */
5374 if (type
->t
& VT_WEAK
)
5376 #ifdef CONFIG_TCC_BCHECK
5377 /* handles bounds now because the symbol must be defined
5378 before for the relocation */
5379 if (tcc_state
->do_bounds_check
) {
5380 unsigned long *bounds_ptr
;
5382 greloc(bounds_section
, sym
, bounds_section
->data_offset
, R_DATA_PTR
);
5383 /* then add global bound info */
5384 bounds_ptr
= section_ptr_add(bounds_section
, 2 * sizeof(long));
5385 bounds_ptr
[0] = 0; /* relocated */
5386 bounds_ptr
[1] = size
;
5390 if (has_init
|| (type
->t
& VT_VLA
)) {
5391 decl_initializer(type
, sec
, addr
, 1, 0);
5392 /* restore parse state if needed */
5394 tok_str_free(init_str
.str
);
5395 restore_parse_state(&saved_parse_state
);
5397 /* patch flexible array member size back to -1, */
5398 /* for possible subsequent similar declarations */
5400 flexible_array
->type
.ref
->c
= -1;
5405 static void put_func_debug(Sym
*sym
)
5410 /* XXX: we put here a dummy type */
5411 snprintf(buf
, sizeof(buf
), "%s:%c1",
5412 funcname
, sym
->type
.t
& VT_STATIC
? 'f' : 'F');
5413 put_stabs_r(buf
, N_FUN
, 0, file
->line_num
, 0,
5414 cur_text_section
, sym
->c
);
5415 /* //gr gdb wants a line at the function */
5416 put_stabn(N_SLINE
, 0, file
->line_num
, 0);
5421 /* parse an old style function declaration list */
5422 /* XXX: check multiple parameter */
5423 static void func_decl_list(Sym
*func_sym
)
5430 /* parse each declaration */
5431 while (tok
!= '{' && tok
!= ';' && tok
!= ',' && tok
!= TOK_EOF
&&
5432 tok
!= TOK_ASM1
&& tok
!= TOK_ASM2
&& tok
!= TOK_ASM3
) {
5433 if (!parse_btype(&btype
, &ad
))
5434 expect("declaration list");
5435 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
5436 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
5438 /* we accept no variable after */
5442 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
5443 /* find parameter in function parameter list */
5446 if ((s
->v
& ~SYM_FIELD
) == v
)
5450 tcc_error("declaration for parameter '%s' but no such parameter",
5451 get_tok_str(v
, NULL
));
5453 /* check that no storage specifier except 'register' was given */
5454 if (type
.t
& VT_STORAGE
)
5455 tcc_error("storage class specified for '%s'", get_tok_str(v
, NULL
));
5456 convert_parameter_type(&type
);
5457 /* we can add the type (NOTE: it could be local to the function) */
5459 /* accept other parameters */
5470 /* parse a function defined by symbol 'sym' and generate its code in
5471 'cur_text_section' */
5472 static void gen_function(Sym
*sym
)
5474 int saved_nocode_wanted
= nocode_wanted
;
5476 ind
= cur_text_section
->data_offset
;
5477 /* NOTE: we patch the symbol size later */
5478 put_extern_sym(sym
, cur_text_section
, ind
, 0);
5479 funcname
= get_tok_str(sym
->v
, NULL
);
5481 /* put debug symbol */
5482 if (tcc_state
->do_debug
)
5483 put_func_debug(sym
);
5484 /* push a dummy symbol to enable local sym storage */
5485 sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
5486 gfunc_prolog(&sym
->type
);
5488 block(NULL
, NULL
, NULL
, NULL
, 0, 0);
5491 cur_text_section
->data_offset
= ind
;
5492 label_pop(&global_label_stack
, NULL
);
5493 sym_pop(&local_stack
, NULL
); /* reset local stack */
5494 /* end of function */
5495 /* patch symbol size */
5496 ((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
].st_size
=
5498 /* patch symbol weakness (this definition overrules any prototype) */
5499 if (sym
->type
.t
& VT_WEAK
)
5501 if (tcc_state
->do_debug
) {
5502 put_stabn(N_FUN
, 0, 0, ind
- func_ind
);
5504 /* It's better to crash than to generate wrong code */
5505 cur_text_section
= NULL
;
5506 funcname
= ""; /* for safety */
5507 func_vt
.t
= VT_VOID
; /* for safety */
5508 ind
= 0; /* for safety */
5509 nocode_wanted
= saved_nocode_wanted
;
5512 ST_FUNC
void gen_inline_functions(void)
5515 int *str
, inline_generated
, i
;
5516 struct InlineFunc
*fn
;
5518 /* iterate while inline function are referenced */
5520 inline_generated
= 0;
5521 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
5522 fn
= tcc_state
->inline_fns
[i
];
5524 if (sym
&& sym
->c
) {
5525 /* the function was used: generate its code and
5526 convert it to a normal function */
5527 str
= fn
->token_str
;
5530 strcpy(file
->filename
, fn
->filename
);
5531 sym
->r
= VT_SYM
| VT_CONST
;
5532 sym
->type
.t
&= ~VT_INLINE
;
5536 cur_text_section
= text_section
;
5538 macro_ptr
= NULL
; /* fail safe */
5540 inline_generated
= 1;
5543 if (!inline_generated
)
5546 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
5547 fn
= tcc_state
->inline_fns
[i
];
5548 str
= fn
->token_str
;
5551 dynarray_reset(&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
);
5554 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
5555 static int decl0(int l
, int is_for_loop_init
)
5563 if (!parse_btype(&btype
, &ad
)) {
5564 if (is_for_loop_init
)
5566 /* skip redundant ';' */
5567 /* XXX: find more elegant solution */
5572 if (l
== VT_CONST
&&
5573 (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
5574 /* global asm block */
5578 /* special test for old K&R protos without explicit int
5579 type. Only accepted when defining global data */
5580 if (l
== VT_LOCAL
|| tok
< TOK_DEFINE
)
5584 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
5585 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
5587 /* we accept no variable after */
5591 while (1) { /* iterate thru each declaration */
5592 char *asm_label
; // associated asm label
5594 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
5598 type_to_str(buf
, sizeof(buf
), t
, get_tok_str(v
, NULL
));
5599 printf("type = '%s'\n", buf
);
5602 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
5603 if ((type
.t
& VT_STATIC
) && (l
== VT_LOCAL
)) {
5604 tcc_error("function without file scope cannot be static");
5606 /* if old style function prototype, we accept a
5609 if (sym
->c
== FUNC_OLD
)
5610 func_decl_list(sym
);
5614 if (gnu_ext
&& (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
5617 asm_label_instr(&astr
);
5618 asm_label
= tcc_strdup(astr
.data
);
5621 /* parse one last attribute list, after asm label */
5622 parse_attribute(&ad
);
5627 #ifdef TCC_TARGET_PE
5629 type
.t
|= VT_IMPORT
;
5631 type
.t
|= VT_EXPORT
;
5635 tcc_error("cannot use local functions");
5636 if ((type
.t
& VT_BTYPE
) != VT_FUNC
)
5637 expect("function definition");
5639 /* reject abstract declarators in function definition */
5641 while ((sym
= sym
->next
) != NULL
)
5642 if (!(sym
->v
& ~SYM_FIELD
))
5643 expect("identifier");
5645 /* XXX: cannot do better now: convert extern line to static inline */
5646 if ((type
.t
& (VT_EXTERN
| VT_INLINE
)) == (VT_EXTERN
| VT_INLINE
))
5647 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
5651 if ((sym
->type
.t
& VT_BTYPE
) != VT_FUNC
)
5654 r
= sym
->type
.ref
->r
;
5655 /* use func_call from prototype if not defined */
5656 if (FUNC_CALL(r
) != FUNC_CDECL
5657 && FUNC_CALL(type
.ref
->r
) == FUNC_CDECL
)
5658 FUNC_CALL(type
.ref
->r
) = FUNC_CALL(r
);
5660 /* use export from prototype */
5662 FUNC_EXPORT(type
.ref
->r
) = 1;
5664 /* use static from prototype */
5665 if (sym
->type
.t
& VT_STATIC
)
5666 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
5668 if (!is_compatible_types(&sym
->type
, &type
)) {
5670 tcc_error("incompatible types for redefinition of '%s'",
5671 get_tok_str(v
, NULL
));
5673 /* if symbol is already defined, then put complete type */
5676 /* put function symbol */
5677 sym
= global_identifier_push(v
, type
.t
, 0);
5678 sym
->type
.ref
= type
.ref
;
5681 /* static inline functions are just recorded as a kind
5682 of macro. Their code will be emitted at the end of
5683 the compilation unit only if they are used */
5684 if ((type
.t
& (VT_INLINE
| VT_STATIC
)) ==
5685 (VT_INLINE
| VT_STATIC
)) {
5686 TokenString func_str
;
5688 struct InlineFunc
*fn
;
5689 const char *filename
;
5691 tok_str_new(&func_str
);
5697 tcc_error("unexpected end of file");
5698 tok_str_add_tok(&func_str
);
5703 } else if (t
== '}') {
5705 if (block_level
== 0)
5709 tok_str_add(&func_str
, -1);
5710 tok_str_add(&func_str
, 0);
5711 filename
= file
? file
->filename
: "";
5712 fn
= tcc_malloc(sizeof *fn
+ strlen(filename
));
5713 strcpy(fn
->filename
, filename
);
5715 fn
->token_str
= func_str
.str
;
5716 dynarray_add((void ***)&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
, fn
);
5719 /* compute text section */
5720 cur_text_section
= ad
.section
;
5721 if (!cur_text_section
)
5722 cur_text_section
= text_section
;
5723 sym
->r
= VT_SYM
| VT_CONST
;
5728 if (btype
.t
& VT_TYPEDEF
) {
5729 /* save typedefed type */
5730 /* XXX: test storage specifiers ? */
5731 sym
= sym_push(v
, &type
, INT_ATTR(&ad
), 0);
5732 sym
->type
.t
|= VT_TYPEDEF
;
5735 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
5736 /* external function definition */
5737 /* specific case for func_call attribute */
5738 type
.ref
->r
= INT_ATTR(&ad
);
5739 } else if (!(type
.t
& VT_ARRAY
)) {
5740 /* not lvalue if array */
5741 r
|= lvalue_type(type
.t
);
5743 has_init
= (tok
== '=');
5744 if (has_init
&& (type
.t
& VT_VLA
))
5745 tcc_error("Variable length array cannot be initialized");
5746 if ((btype
.t
& VT_EXTERN
) || ((type
.t
& VT_BTYPE
) == VT_FUNC
) ||
5747 ((type
.t
& VT_ARRAY
) && (type
.t
& VT_STATIC
) &&
5748 !has_init
&& l
== VT_CONST
&& type
.ref
->c
< 0)) {
5749 /* external variable or function */
5750 /* NOTE: as GCC, uninitialized global static
5751 arrays of null size are considered as
5753 sym
= external_sym(v
, &type
, r
, asm_label
);
5755 if (type
.t
& VT_WEAK
)
5758 if (ad
.alias_target
) {
5763 alias_target
= sym_find(ad
.alias_target
);
5764 if (!alias_target
|| !alias_target
->c
)
5765 tcc_error("unsupported forward __alias__ attribute");
5766 esym
= &((Elf32_Sym
*)symtab_section
->data
)[alias_target
->c
];
5767 tsec
.sh_num
= esym
->st_shndx
;
5768 put_extern_sym2(sym
, &tsec
, esym
->st_value
, esym
->st_size
, 0);
5771 type
.t
|= (btype
.t
& VT_STATIC
); /* Retain "static". */
5772 if (type
.t
& VT_STATIC
)
5778 decl_initializer_alloc(&type
, &ad
, r
, has_init
, v
, asm_label
, l
);
5782 if (is_for_loop_init
)
5795 ST_FUNC
void decl(int l
)