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 ST_FUNC
void vrotb(int n
)
975 /* rotate the n elements before entry e towards the top
976 I1 ... In ... -> In I1 ... I(n-1) ... [top is right]
978 ST_FUNC
void vrote(SValue
*e
, int n
)
984 for(i
= 0;i
< n
- 1; i
++)
989 /* rotate n first stack elements to the top
990 I1 ... In -> In I1 ... I(n-1) [top is right]
992 ST_FUNC
void vrott(int n
)
997 /* pop stack value */
998 ST_FUNC
void vpop(void)
1001 v
= vtop
->r
& VT_VALMASK
;
1002 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
1003 /* for x86, we need to pop the FP stack */
1004 if (v
== TREG_ST0
&& !nocode_wanted
) {
1005 o(0xd8dd); /* fstp %st(0) */
1008 if (v
== VT_JMP
|| v
== VT_JMPI
) {
1009 /* need to put correct jump if && or || without test */
1015 /* convert stack entry to register and duplicate its value in another
1017 static void gv_dup(void)
1023 if ((t
& VT_BTYPE
) == VT_LLONG
) {
1030 /* stack: H L L1 H1 */
1038 /* duplicate value */
1043 #ifdef TCC_TARGET_X86_64
1044 if ((t
& VT_BTYPE
) == VT_LDOUBLE
) {
1054 load(r1
, &sv
); /* move r to r1 */
1056 /* duplicates value */
1062 #ifndef TCC_TARGET_X86_64
1063 /* generate CPU independent (unsigned) long long operations */
1064 static void gen_opl(int op
)
1066 int t
, a
, b
, op1
, c
, i
;
1068 unsigned short reg_iret
= REG_IRET
;
1069 unsigned short reg_lret
= REG_LRET
;
1075 func
= TOK___divdi3
;
1078 func
= TOK___udivdi3
;
1081 func
= TOK___moddi3
;
1084 func
= TOK___umoddi3
;
1091 /* call generic long long function */
1092 vpush_global_sym(&func_old_type
, func
);
1097 vtop
->r2
= reg_lret
;
1110 /* stack: L1 H1 L2 H2 */
1115 vtop
[-2] = vtop
[-3];
1118 /* stack: H1 H2 L1 L2 */
1124 /* stack: H1 H2 L1 L2 ML MH */
1127 /* stack: ML MH H1 H2 L1 L2 */
1131 /* stack: ML MH H1 L2 H2 L1 */
1136 /* stack: ML MH M1 M2 */
1139 } else if (op
== '+' || op
== '-') {
1140 /* XXX: add non carry method too (for MIPS or alpha) */
1146 /* stack: H1 H2 (L1 op L2) */
1149 gen_op(op1
+ 1); /* TOK_xxxC2 */
1152 /* stack: H1 H2 (L1 op L2) */
1155 /* stack: (L1 op L2) H1 H2 */
1157 /* stack: (L1 op L2) (H1 op H2) */
1165 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
1166 t
= vtop
[-1].type
.t
;
1170 /* stack: L H shift */
1172 /* constant: simpler */
1173 /* NOTE: all comments are for SHL. the other cases are
1174 done by swaping words */
1185 if (op
!= TOK_SAR
) {
1218 /* XXX: should provide a faster fallback on x86 ? */
1221 func
= TOK___ashrdi3
;
1224 func
= TOK___lshrdi3
;
1227 func
= TOK___ashldi3
;
1233 /* compare operations */
1239 /* stack: L1 H1 L2 H2 */
1241 vtop
[-1] = vtop
[-2];
1243 /* stack: L1 L2 H1 H2 */
1246 /* when values are equal, we need to compare low words. since
1247 the jump is inverted, we invert the test too. */
1250 else if (op1
== TOK_GT
)
1252 else if (op1
== TOK_ULT
)
1254 else if (op1
== TOK_UGT
)
1259 if (op1
!= TOK_NE
) {
1263 /* generate non equal test */
1264 /* XXX: NOT PORTABLE yet */
1268 #if defined(TCC_TARGET_I386)
1269 b
= psym(0x850f, 0);
1270 #elif defined(TCC_TARGET_ARM)
1272 o(0x1A000000 | encbranch(ind
, 0, 1));
1273 #elif defined(TCC_TARGET_C67)
1274 tcc_error("not implemented");
1276 #error not supported
1280 /* compare low. Always unsigned */
1284 else if (op1
== TOK_LE
)
1286 else if (op1
== TOK_GT
)
1288 else if (op1
== TOK_GE
)
1299 /* handle integer constant optimizations and various machine
1301 static void gen_opic(int op
)
1303 int c1
, c2
, t1
, t2
, n
;
1306 typedef unsigned long long U
;
1310 t1
= v1
->type
.t
& VT_BTYPE
;
1311 t2
= v2
->type
.t
& VT_BTYPE
;
1315 else if (v1
->type
.t
& VT_UNSIGNED
)
1322 else if (v2
->type
.t
& VT_UNSIGNED
)
1327 /* currently, we cannot do computations with forward symbols */
1328 c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1329 c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1332 case '+': l1
+= l2
; break;
1333 case '-': l1
-= l2
; break;
1334 case '&': l1
&= l2
; break;
1335 case '^': l1
^= l2
; break;
1336 case '|': l1
|= l2
; break;
1337 case '*': l1
*= l2
; break;
1344 /* if division by zero, generate explicit division */
1347 tcc_error("division by zero in constant");
1351 default: l1
/= l2
; break;
1352 case '%': l1
%= l2
; break;
1353 case TOK_UDIV
: l1
= (U
)l1
/ l2
; break;
1354 case TOK_UMOD
: l1
= (U
)l1
% l2
; break;
1357 case TOK_SHL
: l1
<<= l2
; break;
1358 case TOK_SHR
: l1
= (U
)l1
>> l2
; break;
1359 case TOK_SAR
: l1
>>= l2
; break;
1361 case TOK_ULT
: l1
= (U
)l1
< (U
)l2
; break;
1362 case TOK_UGE
: l1
= (U
)l1
>= (U
)l2
; break;
1363 case TOK_EQ
: l1
= l1
== l2
; break;
1364 case TOK_NE
: l1
= l1
!= l2
; break;
1365 case TOK_ULE
: l1
= (U
)l1
<= (U
)l2
; break;
1366 case TOK_UGT
: l1
= (U
)l1
> (U
)l2
; break;
1367 case TOK_LT
: l1
= l1
< l2
; break;
1368 case TOK_GE
: l1
= l1
>= l2
; break;
1369 case TOK_LE
: l1
= l1
<= l2
; break;
1370 case TOK_GT
: l1
= l1
> l2
; break;
1372 case TOK_LAND
: l1
= l1
&& l2
; break;
1373 case TOK_LOR
: l1
= l1
|| l2
; break;
1380 /* if commutative ops, put c2 as constant */
1381 if (c1
&& (op
== '+' || op
== '&' || op
== '^' ||
1382 op
== '|' || op
== '*')) {
1384 c2
= c1
; //c = c1, c1 = c2, c2 = c;
1385 l2
= l1
; //l = l1, l1 = l2, l2 = l;
1387 /* Filter out NOP operations like x*1, x-0, x&-1... */
1388 if (c2
&& (((op
== '*' || op
== '/' || op
== TOK_UDIV
||
1391 ((op
== '+' || op
== '-' || op
== '|' || op
== '^' ||
1392 op
== TOK_SHL
|| op
== TOK_SHR
|| op
== TOK_SAR
) &&
1398 } else if (c2
&& (op
== '*' || op
== TOK_PDIV
|| op
== TOK_UDIV
)) {
1399 /* try to use shifts instead of muls or divs */
1400 if (l2
> 0 && (l2
& (l2
- 1)) == 0) {
1409 else if (op
== TOK_PDIV
)
1415 } else if (c2
&& (op
== '+' || op
== '-') &&
1416 (((vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
))
1417 || (vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
)) == VT_LOCAL
)) {
1418 /* symbol + constant case */
1425 if (!nocode_wanted
) {
1426 /* call low level op generator */
1427 if (t1
== VT_LLONG
|| t2
== VT_LLONG
)
1438 /* generate a floating point operation with constant propagation */
1439 static void gen_opif(int op
)
1447 /* currently, we cannot do computations with forward symbols */
1448 c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1449 c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1451 if (v1
->type
.t
== VT_FLOAT
) {
1454 } else if (v1
->type
.t
== VT_DOUBLE
) {
1462 /* NOTE: we only do constant propagation if finite number (not
1463 NaN or infinity) (ANSI spec) */
1464 if (!ieee_finite(f1
) || !ieee_finite(f2
))
1468 case '+': f1
+= f2
; break;
1469 case '-': f1
-= f2
; break;
1470 case '*': f1
*= f2
; break;
1474 tcc_error("division by zero in constant");
1479 /* XXX: also handles tests ? */
1483 /* XXX: overflow test ? */
1484 if (v1
->type
.t
== VT_FLOAT
) {
1486 } else if (v1
->type
.t
== VT_DOUBLE
) {
1494 if (!nocode_wanted
) {
1502 static int pointed_size(CType
*type
)
1505 return type_size(pointed_type(type
), &align
);
1508 static void vla_runtime_pointed_size(CType
*type
)
1511 vla_runtime_type_size(pointed_type(type
), &align
);
1514 static inline int is_null_pointer(SValue
*p
)
1516 if ((p
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
1518 return ((p
->type
.t
& VT_BTYPE
) == VT_INT
&& p
->c
.i
== 0) ||
1519 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& p
->c
.ll
== 0) ||
1520 ((p
->type
.t
& VT_BTYPE
) == VT_PTR
&& p
->c
.ptr
== 0);
1523 static inline int is_integer_btype(int bt
)
1525 return (bt
== VT_BYTE
|| bt
== VT_SHORT
||
1526 bt
== VT_INT
|| bt
== VT_LLONG
);
1529 /* check types for comparison or substraction of pointers */
1530 static void check_comparison_pointer_types(SValue
*p1
, SValue
*p2
, int op
)
1532 CType
*type1
, *type2
, tmp_type1
, tmp_type2
;
1535 /* null pointers are accepted for all comparisons as gcc */
1536 if (is_null_pointer(p1
) || is_null_pointer(p2
))
1540 bt1
= type1
->t
& VT_BTYPE
;
1541 bt2
= type2
->t
& VT_BTYPE
;
1542 /* accept comparison between pointer and integer with a warning */
1543 if ((is_integer_btype(bt1
) || is_integer_btype(bt2
)) && op
!= '-') {
1544 if (op
!= TOK_LOR
&& op
!= TOK_LAND
)
1545 tcc_warning("comparison between pointer and integer");
1549 /* both must be pointers or implicit function pointers */
1550 if (bt1
== VT_PTR
) {
1551 type1
= pointed_type(type1
);
1552 } else if (bt1
!= VT_FUNC
)
1553 goto invalid_operands
;
1555 if (bt2
== VT_PTR
) {
1556 type2
= pointed_type(type2
);
1557 } else if (bt2
!= VT_FUNC
) {
1559 tcc_error("invalid operands to binary %s", get_tok_str(op
, NULL
));
1561 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
1562 (type2
->t
& VT_BTYPE
) == VT_VOID
)
1566 tmp_type1
.t
&= ~(VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1567 tmp_type2
.t
&= ~(VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1568 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
1569 /* gcc-like error if '-' is used */
1571 goto invalid_operands
;
1573 tcc_warning("comparison of distinct pointer types lacks a cast");
1577 /* generic gen_op: handles types problems */
1578 ST_FUNC
void gen_op(int op
)
1580 int u
, t1
, t2
, bt1
, bt2
, t
;
1583 t1
= vtop
[-1].type
.t
;
1584 t2
= vtop
[0].type
.t
;
1585 bt1
= t1
& VT_BTYPE
;
1586 bt2
= t2
& VT_BTYPE
;
1588 if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
1589 /* at least one operand is a pointer */
1590 /* relationnal op: must be both pointers */
1591 if (op
>= TOK_ULT
&& op
<= TOK_LOR
) {
1592 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1593 /* pointers are handled are unsigned */
1594 #ifdef TCC_TARGET_X86_64
1595 t
= VT_LLONG
| VT_UNSIGNED
;
1597 t
= VT_INT
| VT_UNSIGNED
;
1601 /* if both pointers, then it must be the '-' op */
1602 if (bt1
== VT_PTR
&& bt2
== VT_PTR
) {
1604 tcc_error("cannot use pointers here");
1605 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1606 /* XXX: check that types are compatible */
1607 if (vtop
[-1].type
.t
& VT_VLA
) {
1608 vla_runtime_pointed_size(&vtop
[-1].type
);
1610 vpushi(pointed_size(&vtop
[-1].type
));
1614 /* set to integer type */
1615 #ifdef TCC_TARGET_X86_64
1616 vtop
->type
.t
= VT_LLONG
;
1618 vtop
->type
.t
= VT_INT
;
1623 /* exactly one pointer : must be '+' or '-'. */
1624 if (op
!= '-' && op
!= '+')
1625 tcc_error("cannot use pointers here");
1626 /* Put pointer as first operand */
1627 if (bt2
== VT_PTR
) {
1631 type1
= vtop
[-1].type
;
1632 type1
.t
&= ~VT_ARRAY
;
1633 if (vtop
[-1].type
.t
& VT_VLA
)
1634 vla_runtime_pointed_size(&vtop
[-1].type
);
1636 u
= pointed_size(&vtop
[-1].type
);
1638 tcc_error("unknown array element size");
1639 #ifdef TCC_TARGET_X86_64
1642 /* XXX: cast to int ? (long long case) */
1647 #ifdef CONFIG_TCC_BCHECK
1648 /* if evaluating constant expression, no code should be
1649 generated, so no bound check */
1650 if (tcc_state
->do_bounds_check
&& !const_wanted
) {
1651 /* if bounded pointers, we generate a special code to
1658 gen_bounded_ptr_add();
1664 /* put again type if gen_opic() swaped operands */
1667 } else if (is_float(bt1
) || is_float(bt2
)) {
1668 /* compute bigger type and do implicit casts */
1669 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
1671 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
1676 /* floats can only be used for a few operations */
1677 if (op
!= '+' && op
!= '-' && op
!= '*' && op
!= '/' &&
1678 (op
< TOK_ULT
|| op
> TOK_GT
))
1679 tcc_error("invalid operands for binary operation");
1681 } else if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
) {
1682 t
= (bt1
== VT_LLONG
? VT_LLONG
: VT_INT
) | (t1
& VT_UNSIGNED
);
1684 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
1685 /* cast to biggest op */
1687 /* convert to unsigned if it does not fit in a long long */
1688 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
1689 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
1693 /* integer operations */
1695 /* convert to unsigned if it does not fit in an integer */
1696 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
1697 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
1700 /* XXX: currently, some unsigned operations are explicit, so
1701 we modify them here */
1702 if (t
& VT_UNSIGNED
) {
1709 else if (op
== TOK_LT
)
1711 else if (op
== TOK_GT
)
1713 else if (op
== TOK_LE
)
1715 else if (op
== TOK_GE
)
1722 /* special case for shifts and long long: we keep the shift as
1724 if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
)
1731 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
1732 /* relationnal op: the result is an int */
1733 vtop
->type
.t
= VT_INT
;
1740 #ifndef TCC_TARGET_ARM
1741 /* generic itof for unsigned long long case */
1742 static void gen_cvt_itof1(int t
)
1744 if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
1745 (VT_LLONG
| VT_UNSIGNED
)) {
1748 vpush_global_sym(&func_old_type
, TOK___floatundisf
);
1749 #if LDOUBLE_SIZE != 8
1750 else if (t
== VT_LDOUBLE
)
1751 vpush_global_sym(&func_old_type
, TOK___floatundixf
);
1754 vpush_global_sym(&func_old_type
, TOK___floatundidf
);
1758 vtop
->r
= reg_fret(t
);
1765 /* generic ftoi for unsigned long long case */
1766 static void gen_cvt_ftoi1(int t
)
1770 if (t
== (VT_LLONG
| VT_UNSIGNED
)) {
1771 /* not handled natively */
1772 st
= vtop
->type
.t
& VT_BTYPE
;
1774 vpush_global_sym(&func_old_type
, TOK___fixunssfdi
);
1775 #if LDOUBLE_SIZE != 8
1776 else if (st
== VT_LDOUBLE
)
1777 vpush_global_sym(&func_old_type
, TOK___fixunsxfdi
);
1780 vpush_global_sym(&func_old_type
, TOK___fixunsdfdi
);
1785 vtop
->r2
= REG_LRET
;
1791 /* force char or short cast */
1792 static void force_charshort_cast(int t
)
1796 /* XXX: add optimization if lvalue : just change type and offset */
1801 if (t
& VT_UNSIGNED
) {
1802 vpushi((1 << bits
) - 1);
1808 /* result must be signed or the SAR is converted to an SHL
1809 This was not the case when "t" was a signed short
1810 and the last value on the stack was an unsigned int */
1811 vtop
->type
.t
&= ~VT_UNSIGNED
;
1817 /* cast 'vtop' to 'type'. Casting to bitfields is forbidden. */
1818 static void gen_cast(CType
*type
)
1820 int sbt
, dbt
, sf
, df
, c
, p
;
1822 /* special delayed cast for char/short */
1823 /* XXX: in some cases (multiple cascaded casts), it may still
1825 if (vtop
->r
& VT_MUSTCAST
) {
1826 vtop
->r
&= ~VT_MUSTCAST
;
1827 force_charshort_cast(vtop
->type
.t
);
1830 /* bitfields first get cast to ints */
1831 if (vtop
->type
.t
& VT_BITFIELD
) {
1835 dbt
= type
->t
& (VT_BTYPE
| VT_UNSIGNED
);
1836 sbt
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
1841 c
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1842 p
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
);
1844 /* constant case: we can do it now */
1845 /* XXX: in ISOC, cannot do it if error in convert */
1846 if (sbt
== VT_FLOAT
)
1847 vtop
->c
.ld
= vtop
->c
.f
;
1848 else if (sbt
== VT_DOUBLE
)
1849 vtop
->c
.ld
= vtop
->c
.d
;
1852 if ((sbt
& VT_BTYPE
) == VT_LLONG
) {
1853 if (sbt
& VT_UNSIGNED
)
1854 vtop
->c
.ld
= vtop
->c
.ull
;
1856 vtop
->c
.ld
= vtop
->c
.ll
;
1858 if (sbt
& VT_UNSIGNED
)
1859 vtop
->c
.ld
= vtop
->c
.ui
;
1861 vtop
->c
.ld
= vtop
->c
.i
;
1864 if (dbt
== VT_FLOAT
)
1865 vtop
->c
.f
= (float)vtop
->c
.ld
;
1866 else if (dbt
== VT_DOUBLE
)
1867 vtop
->c
.d
= (double)vtop
->c
.ld
;
1868 } else if (sf
&& dbt
== (VT_LLONG
|VT_UNSIGNED
)) {
1869 vtop
->c
.ull
= (unsigned long long)vtop
->c
.ld
;
1870 } else if (sf
&& dbt
== VT_BOOL
) {
1871 vtop
->c
.i
= (vtop
->c
.ld
!= 0);
1874 vtop
->c
.ll
= (long long)vtop
->c
.ld
;
1875 else if (sbt
== (VT_LLONG
|VT_UNSIGNED
))
1876 vtop
->c
.ll
= vtop
->c
.ull
;
1877 else if (sbt
& VT_UNSIGNED
)
1878 vtop
->c
.ll
= vtop
->c
.ui
;
1879 #ifdef TCC_TARGET_X86_64
1880 else if (sbt
== VT_PTR
)
1883 else if (sbt
!= VT_LLONG
)
1884 vtop
->c
.ll
= vtop
->c
.i
;
1886 if (dbt
== (VT_LLONG
|VT_UNSIGNED
))
1887 vtop
->c
.ull
= vtop
->c
.ll
;
1888 else if (dbt
== VT_BOOL
)
1889 vtop
->c
.i
= (vtop
->c
.ll
!= 0);
1890 else if (dbt
!= VT_LLONG
) {
1892 if ((dbt
& VT_BTYPE
) == VT_BYTE
)
1894 else if ((dbt
& VT_BTYPE
) == VT_SHORT
)
1897 if(dbt
& VT_UNSIGNED
)
1898 vtop
->c
.ui
= ((unsigned int)vtop
->c
.ll
<< s
) >> s
;
1900 vtop
->c
.i
= ((int)vtop
->c
.ll
<< s
) >> s
;
1903 } else if (p
&& dbt
== VT_BOOL
) {
1906 } else if (!nocode_wanted
) {
1907 /* non constant case: generate code */
1909 /* convert from fp to fp */
1912 /* convert int to fp */
1915 /* convert fp to int */
1916 if (dbt
== VT_BOOL
) {
1920 /* we handle char/short/etc... with generic code */
1921 if (dbt
!= (VT_INT
| VT_UNSIGNED
) &&
1922 dbt
!= (VT_LLONG
| VT_UNSIGNED
) &&
1926 if (dbt
== VT_INT
&& (type
->t
& (VT_BTYPE
| VT_UNSIGNED
)) != dbt
) {
1927 /* additional cast for char/short... */
1932 #ifndef TCC_TARGET_X86_64
1933 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
) {
1934 if ((sbt
& VT_BTYPE
) != VT_LLONG
) {
1935 /* scalar to long long */
1936 /* machine independent conversion */
1938 /* generate high word */
1939 if (sbt
== (VT_INT
| VT_UNSIGNED
)) {
1943 if (sbt
== VT_PTR
) {
1944 /* cast from pointer to int before we apply
1945 shift operation, which pointers don't support*/
1946 gen_cast(&int_type
);
1952 /* patch second register */
1953 vtop
[-1].r2
= vtop
->r
;
1957 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
||
1958 (dbt
& VT_BTYPE
) == VT_PTR
||
1959 (dbt
& VT_BTYPE
) == VT_FUNC
) {
1960 if ((sbt
& VT_BTYPE
) != VT_LLONG
&&
1961 (sbt
& VT_BTYPE
) != VT_PTR
&&
1962 (sbt
& VT_BTYPE
) != VT_FUNC
) {
1963 /* need to convert from 32bit to 64bit */
1965 if (sbt
!= (VT_INT
| VT_UNSIGNED
)) {
1966 /* x86_64 specific: movslq */
1968 o(0xc0 + (REG_VALUE(r
) << 3) + REG_VALUE(r
));
1972 } else if (dbt
== VT_BOOL
) {
1973 /* scalar to bool */
1976 } else if ((dbt
& VT_BTYPE
) == VT_BYTE
||
1977 (dbt
& VT_BTYPE
) == VT_SHORT
) {
1978 if (sbt
== VT_PTR
) {
1979 vtop
->type
.t
= VT_INT
;
1980 tcc_warning("nonportable conversion from pointer to char/short");
1982 force_charshort_cast(dbt
);
1983 } else if ((dbt
& VT_BTYPE
) == VT_INT
) {
1985 if (sbt
== VT_LLONG
) {
1986 /* from long long: just take low order word */
1990 /* if lvalue and single word type, nothing to do because
1991 the lvalue already contains the real type size (see
1992 VT_LVAL_xxx constants) */
1995 } else if ((dbt
& VT_BTYPE
) == VT_PTR
&& !(vtop
->r
& VT_LVAL
)) {
1996 /* if we are casting between pointer types,
1997 we must update the VT_LVAL_xxx size */
1998 vtop
->r
= (vtop
->r
& ~VT_LVAL_TYPE
)
1999 | (lvalue_type(type
->ref
->type
.t
) & VT_LVAL_TYPE
);
2004 /* return type size as known at compile time. Put alignment at 'a' */
2005 ST_FUNC
int type_size(CType
*type
, int *a
)
2010 bt
= type
->t
& VT_BTYPE
;
2011 if (bt
== VT_STRUCT
) {
2016 } else if (bt
== VT_PTR
) {
2017 if (type
->t
& VT_ARRAY
) {
2021 ts
= type_size(&s
->type
, a
);
2023 if (ts
< 0 && s
->c
< 0)
2031 } else if (bt
== VT_LDOUBLE
) {
2033 return LDOUBLE_SIZE
;
2034 } else if (bt
== VT_DOUBLE
|| bt
== VT_LLONG
) {
2035 #ifdef TCC_TARGET_I386
2036 #ifdef TCC_TARGET_PE
2041 #elif defined(TCC_TARGET_ARM)
2051 } else if (bt
== VT_INT
|| bt
== VT_ENUM
|| bt
== VT_FLOAT
) {
2054 } else if (bt
== VT_SHORT
) {
2058 /* char, void, function, _Bool */
2064 /* push type size as known at runtime time on top of value stack. Put
2066 ST_FUNC
void vla_runtime_type_size(CType
*type
, int *a
)
2068 if (type
->t
& VT_VLA
) {
2069 vset(&int_type
, VT_LOCAL
|VT_LVAL
, type
->ref
->c
);
2071 vpushi(type_size(type
, a
));
2075 /* return the pointed type of t */
2076 static inline CType
*pointed_type(CType
*type
)
2078 return &type
->ref
->type
;
2081 /* modify type so that its it is a pointer to type. */
2082 ST_FUNC
void mk_pointer(CType
*type
)
2085 s
= sym_push(SYM_FIELD
, type
, 0, -1);
2086 type
->t
= VT_PTR
| (type
->t
& ~VT_TYPE
);
2090 /* compare function types. OLD functions match any new functions */
2091 static int is_compatible_func(CType
*type1
, CType
*type2
)
2097 if (!is_compatible_types(&s1
->type
, &s2
->type
))
2099 /* check func_call */
2100 if (FUNC_CALL(s1
->r
) != FUNC_CALL(s2
->r
))
2102 /* XXX: not complete */
2103 if (s1
->c
== FUNC_OLD
|| s2
->c
== FUNC_OLD
)
2107 while (s1
!= NULL
) {
2110 if (!is_compatible_parameter_types(&s1
->type
, &s2
->type
))
2120 /* return true if type1 and type2 are the same. If unqualified is
2121 true, qualifiers on the types are ignored.
2123 - enums are not checked as gcc __builtin_types_compatible_p ()
2125 static int compare_types(CType
*type1
, CType
*type2
, int unqualified
)
2129 t1
= type1
->t
& VT_TYPE
;
2130 t2
= type2
->t
& VT_TYPE
;
2132 /* strip qualifiers before comparing */
2133 t1
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2134 t2
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2136 /* XXX: bitfields ? */
2139 /* test more complicated cases */
2140 bt1
= t1
& VT_BTYPE
;
2141 if (bt1
== VT_PTR
) {
2142 type1
= pointed_type(type1
);
2143 type2
= pointed_type(type2
);
2144 return is_compatible_types(type1
, type2
);
2145 } else if (bt1
== VT_STRUCT
) {
2146 return (type1
->ref
== type2
->ref
);
2147 } else if (bt1
== VT_FUNC
) {
2148 return is_compatible_func(type1
, type2
);
2154 /* return true if type1 and type2 are exactly the same (including
2157 static int is_compatible_types(CType
*type1
, CType
*type2
)
2159 return compare_types(type1
,type2
,0);
2162 /* return true if type1 and type2 are the same (ignoring qualifiers).
2164 static int is_compatible_parameter_types(CType
*type1
, CType
*type2
)
2166 return compare_types(type1
,type2
,1);
2169 /* print a type. If 'varstr' is not NULL, then the variable is also
2170 printed in the type */
2172 /* XXX: add array and function pointers */
2173 static void type_to_str(char *buf
, int buf_size
,
2174 CType
*type
, const char *varstr
)
2181 t
= type
->t
& VT_TYPE
;
2184 if (t
& VT_CONSTANT
)
2185 pstrcat(buf
, buf_size
, "const ");
2186 if (t
& VT_VOLATILE
)
2187 pstrcat(buf
, buf_size
, "volatile ");
2188 if (t
& VT_UNSIGNED
)
2189 pstrcat(buf
, buf_size
, "unsigned ");
2219 tstr
= "long double";
2221 pstrcat(buf
, buf_size
, tstr
);
2225 if (bt
== VT_STRUCT
)
2229 pstrcat(buf
, buf_size
, tstr
);
2230 v
= type
->ref
->v
& ~SYM_STRUCT
;
2231 if (v
>= SYM_FIRST_ANOM
)
2232 pstrcat(buf
, buf_size
, "<anonymous>");
2234 pstrcat(buf
, buf_size
, get_tok_str(v
, NULL
));
2238 type_to_str(buf
, buf_size
, &s
->type
, varstr
);
2239 pstrcat(buf
, buf_size
, "(");
2241 while (sa
!= NULL
) {
2242 type_to_str(buf1
, sizeof(buf1
), &sa
->type
, NULL
);
2243 pstrcat(buf
, buf_size
, buf1
);
2246 pstrcat(buf
, buf_size
, ", ");
2248 pstrcat(buf
, buf_size
, ")");
2252 pstrcpy(buf1
, sizeof(buf1
), "*");
2254 pstrcat(buf1
, sizeof(buf1
), varstr
);
2255 type_to_str(buf
, buf_size
, &s
->type
, buf1
);
2259 pstrcat(buf
, buf_size
, " ");
2260 pstrcat(buf
, buf_size
, varstr
);
2265 /* verify type compatibility to store vtop in 'dt' type, and generate
2267 static void gen_assign_cast(CType
*dt
)
2269 CType
*st
, *type1
, *type2
, tmp_type1
, tmp_type2
;
2270 char buf1
[256], buf2
[256];
2273 st
= &vtop
->type
; /* source type */
2274 dbt
= dt
->t
& VT_BTYPE
;
2275 sbt
= st
->t
& VT_BTYPE
;
2277 tcc_error("Cannot assign void value");
2278 if (dt
->t
& VT_CONSTANT
)
2279 tcc_warning("assignment of read-only location");
2282 /* special cases for pointers */
2283 /* '0' can also be a pointer */
2284 if (is_null_pointer(vtop
))
2286 /* accept implicit pointer to integer cast with warning */
2287 if (is_integer_btype(sbt
)) {
2288 tcc_warning("assignment makes pointer from integer without a cast");
2291 type1
= pointed_type(dt
);
2292 /* a function is implicitely a function pointer */
2293 if (sbt
== VT_FUNC
) {
2294 if ((type1
->t
& VT_BTYPE
) != VT_VOID
&&
2295 !is_compatible_types(pointed_type(dt
), st
))
2296 tcc_warning("assignment from incompatible pointer type");
2301 type2
= pointed_type(st
);
2302 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
2303 (type2
->t
& VT_BTYPE
) == VT_VOID
) {
2304 /* void * can match anything */
2306 /* exact type match, except for unsigned */
2309 tmp_type1
.t
&= ~(VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
2310 tmp_type2
.t
&= ~(VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
2311 if (!is_compatible_types(&tmp_type1
, &tmp_type2
))
2312 tcc_warning("assignment from incompatible pointer type");
2314 /* check const and volatile */
2315 if ((!(type1
->t
& VT_CONSTANT
) && (type2
->t
& VT_CONSTANT
)) ||
2316 (!(type1
->t
& VT_VOLATILE
) && (type2
->t
& VT_VOLATILE
)))
2317 tcc_warning("assignment discards qualifiers from pointer target type");
2323 if (sbt
== VT_PTR
|| sbt
== VT_FUNC
) {
2324 tcc_warning("assignment makes integer from pointer without a cast");
2326 /* XXX: more tests */
2331 tmp_type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2332 tmp_type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2333 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
2335 type_to_str(buf1
, sizeof(buf1
), st
, NULL
);
2336 type_to_str(buf2
, sizeof(buf2
), dt
, NULL
);
2337 tcc_error("cannot cast '%s' to '%s'", buf1
, buf2
);
2345 /* store vtop in lvalue pushed on stack */
2346 ST_FUNC
void vstore(void)
2348 int sbt
, dbt
, ft
, r
, t
, size
, align
, bit_size
, bit_pos
, rc
, delayed_cast
;
2350 ft
= vtop
[-1].type
.t
;
2351 sbt
= vtop
->type
.t
& VT_BTYPE
;
2352 dbt
= ft
& VT_BTYPE
;
2353 if ((((sbt
== VT_INT
|| sbt
== VT_SHORT
) && dbt
== VT_BYTE
) ||
2354 (sbt
== VT_INT
&& dbt
== VT_SHORT
))
2355 && !(vtop
->type
.t
& VT_BITFIELD
)) {
2356 /* optimize char/short casts */
2357 delayed_cast
= VT_MUSTCAST
;
2358 vtop
->type
.t
= ft
& (VT_TYPE
& ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
)));
2359 /* XXX: factorize */
2360 if (ft
& VT_CONSTANT
)
2361 tcc_warning("assignment of read-only location");
2364 if (!(ft
& VT_BITFIELD
))
2365 gen_assign_cast(&vtop
[-1].type
);
2368 if (sbt
== VT_STRUCT
) {
2369 /* if structure, only generate pointer */
2370 /* structure assignment : generate memcpy */
2371 /* XXX: optimize if small size */
2372 if (!nocode_wanted
) {
2373 size
= type_size(&vtop
->type
, &align
);
2377 vtop
->type
.t
= VT_PTR
;
2380 /* address of memcpy() */
2383 vpush_global_sym(&func_old_type
, TOK_memcpy8
);
2384 else if(!(align
& 3))
2385 vpush_global_sym(&func_old_type
, TOK_memcpy4
);
2388 vpush_global_sym(&func_old_type
, TOK_memcpy
);
2393 vtop
->type
.t
= VT_PTR
;
2402 /* leave source on stack */
2403 } else if (ft
& VT_BITFIELD
) {
2404 /* bitfield store handling */
2405 bit_pos
= (ft
>> VT_STRUCT_SHIFT
) & 0x3f;
2406 bit_size
= (ft
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
2407 /* remove bit field info to avoid loops */
2408 vtop
[-1].type
.t
= ft
& ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
));
2410 /* duplicate source into other register */
2415 if((ft
& VT_BTYPE
) == VT_BOOL
) {
2416 gen_cast(&vtop
[-1].type
);
2417 vtop
[-1].type
.t
= (vtop
[-1].type
.t
& ~VT_BTYPE
) | (VT_BYTE
| VT_UNSIGNED
);
2420 /* duplicate destination */
2422 vtop
[-1] = vtop
[-2];
2424 /* mask and shift source */
2425 if((ft
& VT_BTYPE
) != VT_BOOL
) {
2426 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2427 vpushll((1ULL << bit_size
) - 1ULL);
2429 vpushi((1 << bit_size
) - 1);
2435 /* load destination, mask and or with source */
2437 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2438 vpushll(~(((1ULL << bit_size
) - 1ULL) << bit_pos
));
2440 vpushi(~(((1 << bit_size
) - 1) << bit_pos
));
2447 /* pop off shifted source from "duplicate source..." above */
2451 #ifdef CONFIG_TCC_BCHECK
2452 /* bound check case */
2453 if (vtop
[-1].r
& VT_MUSTBOUND
) {
2459 if (!nocode_wanted
) {
2463 #ifdef TCC_TARGET_X86_64
2464 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
2469 r
= gv(rc
); /* generate value */
2470 /* if lvalue was saved on stack, must read it */
2471 if ((vtop
[-1].r
& VT_VALMASK
) == VT_LLOCAL
) {
2473 t
= get_reg(RC_INT
);
2474 #ifdef TCC_TARGET_X86_64
2479 sv
.r
= VT_LOCAL
| VT_LVAL
;
2480 sv
.c
.ul
= vtop
[-1].c
.ul
;
2482 vtop
[-1].r
= t
| VT_LVAL
;
2485 #ifndef TCC_TARGET_X86_64
2486 /* two word case handling : store second register at word + 4 */
2487 if ((ft
& VT_BTYPE
) == VT_LLONG
) {
2489 /* convert to int to increment easily */
2490 vtop
->type
.t
= VT_INT
;
2496 /* XXX: it works because r2 is spilled last ! */
2497 store(vtop
->r2
, vtop
- 1);
2502 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
2503 vtop
->r
|= delayed_cast
;
2507 /* post defines POST/PRE add. c is the token ++ or -- */
2508 ST_FUNC
void inc(int post
, int c
)
2511 vdup(); /* save lvalue */
2513 gv_dup(); /* duplicate value */
2518 vpushi(c
- TOK_MID
);
2520 vstore(); /* store value */
2522 vpop(); /* if post op, return saved value */
2525 /* Parse GNUC __attribute__ extension. Currently, the following
2526 extensions are recognized:
2527 - aligned(n) : set data/function alignment.
2528 - packed : force data alignment to 1
2529 - section(x) : generate data/code in this section.
2530 - unused : currently ignored, but may be used someday.
2531 - regparm(n) : pass function parameters in registers (i386 only)
2533 static void parse_attribute(AttributeDef
*ad
)
2537 while (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
) {
2541 while (tok
!= ')') {
2542 if (tok
< TOK_IDENT
)
2543 expect("attribute name");
2551 expect("section name");
2552 ad
->section
= find_section(tcc_state
, (char *)tokc
.cstr
->data
);
2560 expect("alias(\"target\")");
2561 ad
->alias_target
= /* save string as token, for later */
2562 tok_alloc((char*)tokc
.cstr
->data
, tokc
.cstr
->size
-1)->tok
;
2571 if (n
<= 0 || (n
& (n
- 1)) != 0)
2572 tcc_error("alignment must be a positive power of two");
2589 /* currently, no need to handle it because tcc does not
2590 track unused objects */
2594 /* currently, no need to handle it because tcc does not
2595 track unused objects */
2600 ad
->func_call
= FUNC_CDECL
;
2605 ad
->func_call
= FUNC_STDCALL
;
2607 #ifdef TCC_TARGET_I386
2617 ad
->func_call
= FUNC_FASTCALL1
+ n
- 1;
2623 ad
->func_call
= FUNC_FASTCALLW
;
2630 ad
->mode
= VT_LLONG
+ 1;
2633 ad
->mode
= VT_SHORT
+ 1;
2636 ad
->mode
= VT_INT
+ 1;
2639 tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok
, NULL
));
2646 ad
->func_export
= 1;
2649 ad
->func_import
= 1;
2652 if (tcc_state
->warn_unsupported
)
2653 tcc_warning("'%s' attribute ignored", get_tok_str(t
, NULL
));
2654 /* skip parameters */
2656 int parenthesis
= 0;
2660 else if (tok
== ')')
2663 } while (parenthesis
&& tok
!= -1);
2676 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
2677 static void struct_decl(CType
*type
, int u
)
2679 int a
, v
, size
, align
, maxalign
, c
, offset
;
2680 int bit_size
, bit_pos
, bsize
, bt
, lbit_pos
, prevbt
;
2681 Sym
*s
, *ss
, *ass
, **ps
;
2685 a
= tok
; /* save decl type */
2690 /* struct already defined ? return it */
2692 expect("struct/union/enum name");
2696 tcc_error("invalid type");
2703 /* we put an undefined size for struct/union */
2704 s
= sym_push(v
| SYM_STRUCT
, &type1
, 0, -1);
2705 s
->r
= 0; /* default alignment is zero as gcc */
2706 /* put struct/union/enum name in type */
2714 tcc_error("struct/union/enum already defined");
2715 /* cannot be empty */
2717 /* non empty enums are not allowed */
2718 if (a
== TOK_ENUM
) {
2722 expect("identifier");
2728 /* enum symbols have static storage */
2729 ss
= sym_push(v
, &int_type
, VT_CONST
, c
);
2730 ss
->type
.t
|= VT_STATIC
;
2735 /* NOTE: we accept a trailing comma */
2746 while (tok
!= '}') {
2747 parse_btype(&btype
, &ad
);
2753 type_decl(&type1
, &ad
, &v
, TYPE_DIRECT
| TYPE_ABSTRACT
);
2754 if (v
== 0 && (type1
.t
& VT_BTYPE
) != VT_STRUCT
)
2755 expect("identifier");
2756 if ((type1
.t
& VT_BTYPE
) == VT_FUNC
||
2757 (type1
.t
& (VT_TYPEDEF
| VT_STATIC
| VT_EXTERN
| VT_INLINE
)))
2758 tcc_error("invalid type for '%s'",
2759 get_tok_str(v
, NULL
));
2763 bit_size
= expr_const();
2764 /* XXX: handle v = 0 case for messages */
2766 tcc_error("negative width in bit-field '%s'",
2767 get_tok_str(v
, NULL
));
2768 if (v
&& bit_size
== 0)
2769 tcc_error("zero width for bit-field '%s'",
2770 get_tok_str(v
, NULL
));
2772 size
= type_size(&type1
, &align
);
2774 if (align
< ad
.aligned
)
2776 } else if (ad
.packed
) {
2778 } else if (*tcc_state
->pack_stack_ptr
) {
2779 if (align
> *tcc_state
->pack_stack_ptr
)
2780 align
= *tcc_state
->pack_stack_ptr
;
2783 if (bit_size
>= 0) {
2784 bt
= type1
.t
& VT_BTYPE
;
2791 tcc_error("bitfields must have scalar type");
2793 if (bit_size
> bsize
) {
2794 tcc_error("width of '%s' exceeds its type",
2795 get_tok_str(v
, NULL
));
2796 } else if (bit_size
== bsize
) {
2797 /* no need for bit fields */
2799 } else if (bit_size
== 0) {
2800 /* XXX: what to do if only padding in a
2802 /* zero size: means to pad */
2805 /* we do not have enough room ?
2806 did the type change?
2808 if ((bit_pos
+ bit_size
) > bsize
||
2809 bt
!= prevbt
|| a
== TOK_UNION
)
2812 /* XXX: handle LSB first */
2813 type1
.t
|= VT_BITFIELD
|
2814 (bit_pos
<< VT_STRUCT_SHIFT
) |
2815 (bit_size
<< (VT_STRUCT_SHIFT
+ 6));
2816 bit_pos
+= bit_size
;
2822 if (v
!= 0 || (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
2823 /* add new memory data only if starting
2825 if (lbit_pos
== 0) {
2826 if (a
== TOK_STRUCT
) {
2827 c
= (c
+ align
- 1) & -align
;
2836 if (align
> maxalign
)
2840 printf("add field %s offset=%d",
2841 get_tok_str(v
, NULL
), offset
);
2842 if (type1
.t
& VT_BITFIELD
) {
2843 printf(" pos=%d size=%d",
2844 (type1
.t
>> VT_STRUCT_SHIFT
) & 0x3f,
2845 (type1
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f);
2850 if (v
== 0 && (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
2852 while ((ass
= ass
->next
) != NULL
) {
2853 ss
= sym_push(ass
->v
, &ass
->type
, 0, offset
+ ass
->c
);
2858 ss
= sym_push(v
| SYM_FIELD
, &type1
, 0, offset
);
2862 if (tok
== ';' || tok
== TOK_EOF
)
2869 /* store size and alignment */
2870 s
->c
= (c
+ maxalign
- 1) & -maxalign
;
2876 /* return 0 if no type declaration. otherwise, return the basic type
2879 static int parse_btype(CType
*type
, AttributeDef
*ad
)
2881 int t
, u
, type_found
, typespec_found
, typedef_found
;
2885 memset(ad
, 0, sizeof(AttributeDef
));
2893 /* currently, we really ignore extension */
2903 if ((t
& VT_BTYPE
) != 0)
2904 tcc_error("too many basic types");
2920 if ((t
& VT_BTYPE
) == VT_DOUBLE
) {
2921 #ifndef TCC_TARGET_PE
2922 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
2924 } else if ((t
& VT_BTYPE
) == VT_LONG
) {
2925 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
2939 if ((t
& VT_BTYPE
) == VT_LONG
) {
2940 #ifdef TCC_TARGET_PE
2941 t
= (t
& ~VT_BTYPE
) | VT_DOUBLE
;
2943 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
2951 struct_decl(&type1
, VT_ENUM
);
2954 type
->ref
= type1
.ref
;
2958 struct_decl(&type1
, VT_STRUCT
);
2961 /* type modifiers */
3014 /* GNUC attribute */
3015 case TOK_ATTRIBUTE1
:
3016 case TOK_ATTRIBUTE2
:
3017 parse_attribute(ad
);
3020 t
= (t
& ~VT_BTYPE
) | u
;
3028 parse_expr_type(&type1
);
3029 /* remove all storage modifiers except typedef */
3030 type1
.t
&= ~(VT_STORAGE
&~VT_TYPEDEF
);
3033 if (typespec_found
|| typedef_found
)
3036 if (!s
|| !(s
->type
.t
& VT_TYPEDEF
))
3039 t
|= (s
->type
.t
& ~VT_TYPEDEF
);
3040 type
->ref
= s
->type
.ref
;
3042 /* get attributes from typedef */
3043 if (0 == ad
->aligned
)
3044 ad
->aligned
= FUNC_ALIGN(s
->r
);
3045 if (0 == ad
->func_call
)
3046 ad
->func_call
= FUNC_CALL(s
->r
);
3047 ad
->packed
|= FUNC_PACKED(s
->r
);
3056 if ((t
& (VT_SIGNED
|VT_UNSIGNED
)) == (VT_SIGNED
|VT_UNSIGNED
))
3057 tcc_error("signed and unsigned modifier");
3058 if (tcc_state
->char_is_unsigned
) {
3059 if ((t
& (VT_SIGNED
|VT_UNSIGNED
|VT_BTYPE
)) == VT_BYTE
)
3064 /* long is never used as type */
3065 if ((t
& VT_BTYPE
) == VT_LONG
)
3066 #if !defined TCC_TARGET_X86_64 || defined TCC_TARGET_PE
3067 t
= (t
& ~VT_BTYPE
) | VT_INT
;
3069 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3075 /* convert a function parameter type (array to pointer and function to
3076 function pointer) */
3077 static inline void convert_parameter_type(CType
*pt
)
3079 /* remove const and volatile qualifiers (XXX: const could be used
3080 to indicate a const function parameter */
3081 pt
->t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3082 /* array must be transformed to pointer according to ANSI C */
3084 if ((pt
->t
& VT_BTYPE
) == VT_FUNC
) {
3089 ST_FUNC
void parse_asm_str(CString
*astr
)
3092 /* read the string */
3094 expect("string constant");
3096 while (tok
== TOK_STR
) {
3097 /* XXX: add \0 handling too ? */
3098 cstr_cat(astr
, tokc
.cstr
->data
);
3101 cstr_ccat(astr
, '\0');
3104 /* Parse an asm label and return the label
3105 * Don't forget to free the CString in the caller! */
3106 static void asm_label_instr(CString
*astr
)
3109 parse_asm_str(astr
);
3112 printf("asm_alias: \"%s\"\n", (char *)astr
->data
);
3116 static void post_type(CType
*type
, AttributeDef
*ad
)
3118 int n
, l
, t1
, arg_size
, align
;
3119 Sym
**plast
, *s
, *first
;
3124 /* function declaration */
3132 /* read param name and compute offset */
3133 if (l
!= FUNC_OLD
) {
3134 if (!parse_btype(&pt
, &ad1
)) {
3136 tcc_error("invalid type");
3143 if ((pt
.t
& VT_BTYPE
) == VT_VOID
&& tok
== ')')
3145 type_decl(&pt
, &ad1
, &n
, TYPE_DIRECT
| TYPE_ABSTRACT
);
3146 if ((pt
.t
& VT_BTYPE
) == VT_VOID
)
3147 tcc_error("parameter declared as void");
3148 arg_size
+= (type_size(&pt
, &align
) + PTR_SIZE
- 1) / PTR_SIZE
;
3153 expect("identifier");
3157 convert_parameter_type(&pt
);
3158 s
= sym_push(n
| SYM_FIELD
, &pt
, 0, 0);
3164 if (l
== FUNC_NEW
&& tok
== TOK_DOTS
) {
3171 /* if no parameters, then old type prototype */
3175 /* NOTE: const is ignored in returned type as it has a special
3176 meaning in gcc / C++ */
3177 type
->t
&= ~VT_CONSTANT
;
3178 /* some ancient pre-K&R C allows a function to return an array
3179 and the array brackets to be put after the arguments, such
3180 that "int c()[]" means something like "int[] c()" */
3183 skip(']'); /* only handle simple "[]" */
3186 /* we push a anonymous symbol which will contain the function prototype */
3187 ad
->func_args
= arg_size
;
3188 s
= sym_push(SYM_FIELD
, type
, INT_ATTR(ad
), l
);
3192 } else if (tok
== '[') {
3193 /* array definition */
3195 if (tok
== TOK_RESTRICT1
)
3200 if (!local_stack
|| nocode_wanted
)
3201 vpushi(expr_const());
3203 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3206 tcc_error("invalid array size");
3208 if (!is_integer_btype(vtop
->type
.t
& VT_BTYPE
))
3209 tcc_error("size of variable length array should be an integer");
3214 /* parse next post type */
3215 post_type(type
, ad
);
3216 t1
|= type
->t
& VT_VLA
;
3219 loc
-= type_size(&int_type
, &align
);
3223 vla_runtime_type_size(type
, &align
);
3225 vset(&int_type
, VT_LOCAL
|VT_LVAL
, loc
);
3232 /* we push an anonymous symbol which will contain the array
3234 s
= sym_push(SYM_FIELD
, type
, 0, n
);
3235 type
->t
= (t1
? VT_VLA
: VT_ARRAY
) | VT_PTR
;
3240 /* Parse a type declaration (except basic type), and return the type
3241 in 'type'. 'td' is a bitmask indicating which kind of type decl is
3242 expected. 'type' should contain the basic type. 'ad' is the
3243 attribute definition of the basic type. It can be modified by
3246 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
)
3249 CType type1
, *type2
;
3250 int qualifiers
, storage
;
3252 while (tok
== '*') {
3260 qualifiers
|= VT_CONSTANT
;
3265 qualifiers
|= VT_VOLATILE
;
3273 type
->t
|= qualifiers
;
3276 /* XXX: clarify attribute handling */
3277 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3278 parse_attribute(ad
);
3280 /* recursive type */
3281 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
3282 type1
.t
= 0; /* XXX: same as int */
3285 /* XXX: this is not correct to modify 'ad' at this point, but
3286 the syntax is not clear */
3287 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3288 parse_attribute(ad
);
3289 type_decl(&type1
, ad
, v
, td
);
3292 /* type identifier */
3293 if (tok
>= TOK_IDENT
&& (td
& TYPE_DIRECT
)) {
3297 if (!(td
& TYPE_ABSTRACT
))
3298 expect("identifier");
3302 storage
= type
->t
& VT_STORAGE
;
3303 type
->t
&= ~VT_STORAGE
;
3304 post_type(type
, ad
);
3306 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3307 parse_attribute(ad
);
3311 /* append type at the end of type1 */
3324 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
3325 ST_FUNC
int lvalue_type(int t
)
3330 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
3332 else if (bt
== VT_SHORT
)
3336 if (t
& VT_UNSIGNED
)
3337 r
|= VT_LVAL_UNSIGNED
;
3341 /* indirection with full error checking and bound check */
3342 ST_FUNC
void indir(void)
3344 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
) {
3345 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FUNC
)
3349 if ((vtop
->r
& VT_LVAL
) && !nocode_wanted
)
3351 vtop
->type
= *pointed_type(&vtop
->type
);
3352 /* Arrays and functions are never lvalues */
3353 if (!(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_VLA
)
3354 && (vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
3355 vtop
->r
|= lvalue_type(vtop
->type
.t
);
3356 /* if bound checking, the referenced pointer must be checked */
3357 #ifdef CONFIG_TCC_BCHECK
3358 if (tcc_state
->do_bounds_check
)
3359 vtop
->r
|= VT_MUSTBOUND
;
3364 /* pass a parameter to a function and do type checking and casting */
3365 static void gfunc_param_typed(Sym
*func
, Sym
*arg
)
3370 func_type
= func
->c
;
3371 if (func_type
== FUNC_OLD
||
3372 (func_type
== FUNC_ELLIPSIS
&& arg
== NULL
)) {
3373 /* default casting : only need to convert float to double */
3374 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
) {
3378 } else if (arg
== NULL
) {
3379 tcc_error("too many arguments to function");
3382 type
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
3383 gen_assign_cast(&type
);
3387 /* parse an expression of the form '(type)' or '(expr)' and return its
3389 static void parse_expr_type(CType
*type
)
3395 if (parse_btype(type
, &ad
)) {
3396 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3403 static void parse_type(CType
*type
)
3408 if (!parse_btype(type
, &ad
)) {
3411 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3414 static void vpush_tokc(int t
)
3419 vsetc(&type
, VT_CONST
, &tokc
);
3422 ST_FUNC
void unary(void)
3424 int n
, t
, align
, size
, r
, sizeof_caller
;
3428 static int in_sizeof
= 0;
3430 sizeof_caller
= in_sizeof
;
3432 /* XXX: GCC 2.95.3 does not generate a table although it should be
3446 vpush_tokc(VT_INT
| VT_UNSIGNED
);
3450 vpush_tokc(VT_LLONG
);
3454 vpush_tokc(VT_LLONG
| VT_UNSIGNED
);
3458 vpush_tokc(VT_FLOAT
);
3462 vpush_tokc(VT_DOUBLE
);
3466 vpush_tokc(VT_LDOUBLE
);
3469 case TOK___FUNCTION__
:
3471 goto tok_identifier
;
3477 /* special function name identifier */
3478 len
= strlen(funcname
) + 1;
3479 /* generate char[len] type */
3484 vpush_ref(&type
, data_section
, data_section
->data_offset
, len
);
3485 ptr
= section_ptr_add(data_section
, len
);
3486 memcpy(ptr
, funcname
, len
);
3491 #ifdef TCC_TARGET_PE
3492 t
= VT_SHORT
| VT_UNSIGNED
;
3498 /* string parsing */
3501 if (tcc_state
->warn_write_strings
)
3506 memset(&ad
, 0, sizeof(AttributeDef
));
3507 decl_initializer_alloc(&type
, &ad
, VT_CONST
, 2, 0, NULL
, 0);
3512 if (parse_btype(&type
, &ad
)) {
3513 type_decl(&type
, &ad
, &n
, TYPE_ABSTRACT
);
3515 /* check ISOC99 compound literal */
3517 /* data is allocated locally by default */
3522 /* all except arrays are lvalues */
3523 if (!(type
.t
& VT_ARRAY
))
3524 r
|= lvalue_type(type
.t
);
3525 memset(&ad
, 0, sizeof(AttributeDef
));
3526 decl_initializer_alloc(&type
, &ad
, r
, 1, 0, NULL
, 0);
3528 if (sizeof_caller
) {
3535 } else if (tok
== '{') {
3536 /* save all registers */
3538 /* statement expression : we do not accept break/continue
3539 inside as GCC does */
3540 block(NULL
, NULL
, NULL
, NULL
, 0, 1);
3555 /* functions names must be treated as function pointers,
3556 except for unary '&' and sizeof. Since we consider that
3557 functions are not lvalues, we only have to handle it
3558 there and in function calls. */
3559 /* arrays can also be used although they are not lvalues */
3560 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
&&
3561 !(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_LLOCAL
))
3563 mk_pointer(&vtop
->type
);
3569 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3571 boolean
.t
= VT_BOOL
;
3573 vtop
->c
.i
= !vtop
->c
.i
;
3574 } else if ((vtop
->r
& VT_VALMASK
) == VT_CMP
)
3575 vtop
->c
.i
= vtop
->c
.i
^ 1;
3578 vseti(VT_JMP
, gtst(1, 0));
3589 /* in order to force cast, we add zero */
3591 if ((vtop
->type
.t
& VT_BTYPE
) == VT_PTR
)
3592 tcc_error("pointer not accepted for unary plus");
3602 unary_type(&type
); // Perform a in_sizeof = 0;
3603 size
= type_size(&type
, &align
);
3604 if (t
== TOK_SIZEOF
) {
3605 if (!(type
.t
& VT_VLA
)) {
3607 tcc_error("sizeof applied to an incomplete type");
3610 vla_runtime_type_size(&type
, &align
);
3615 vtop
->type
.t
|= VT_UNSIGNED
;
3618 case TOK_builtin_types_compatible_p
:
3627 type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3628 type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3629 vpushi(is_compatible_types(&type1
, &type2
));
3632 case TOK_builtin_constant_p
:
3634 int saved_nocode_wanted
, res
;
3637 saved_nocode_wanted
= nocode_wanted
;
3640 res
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
3642 nocode_wanted
= saved_nocode_wanted
;
3647 case TOK_builtin_frame_address
:
3652 if (tok
!= TOK_CINT
) {
3653 tcc_error("__builtin_frame_address only takes integers");
3656 tcc_error("TCC only supports __builtin_frame_address(0)");
3662 vset(&type
, VT_LOCAL
, 0);
3665 #ifdef TCC_TARGET_X86_64
3666 case TOK_builtin_va_arg_types
:
3668 /* This definition must be synced with stdarg.h */
3669 enum __va_arg_type
{
3670 __va_gen_reg
, __va_float_reg
, __va_stack
3678 bt
= type
.t
& VT_BTYPE
;
3679 if (bt
== VT_STRUCT
|| bt
== VT_LDOUBLE
) {
3681 } else if (bt
== VT_FLOAT
|| bt
== VT_DOUBLE
) {
3682 vpushi(__va_float_reg
);
3684 vpushi(__va_gen_reg
);
3704 goto tok_identifier
;
3706 /* allow to take the address of a label */
3707 if (tok
< TOK_UIDENT
)
3708 expect("label identifier");
3709 s
= label_find(tok
);
3711 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
3713 if (s
->r
== LABEL_DECLARED
)
3714 s
->r
= LABEL_FORWARD
;
3717 s
->type
.t
= VT_VOID
;
3718 mk_pointer(&s
->type
);
3719 s
->type
.t
|= VT_STATIC
;
3721 vset(&s
->type
, VT_CONST
| VT_SYM
, 0);
3726 // special qnan , snan and infinity values
3728 vpush64(VT_DOUBLE
, 0x7ff8000000000000ULL
);
3732 vpush64(VT_DOUBLE
, 0x7ff0000000000001ULL
);
3736 vpush64(VT_DOUBLE
, 0x7ff0000000000000ULL
);
3745 expect("identifier");
3749 tcc_error("'%s' undeclared", get_tok_str(t
, NULL
));
3750 /* for simple function calls, we tolerate undeclared
3751 external reference to int() function */
3752 if (tcc_state
->warn_implicit_function_declaration
)
3753 tcc_warning("implicit declaration of function '%s'",
3754 get_tok_str(t
, NULL
));
3755 s
= external_global_sym(t
, &func_old_type
, 0);
3757 if ((s
->type
.t
& (VT_STATIC
| VT_INLINE
| VT_BTYPE
)) ==
3758 (VT_STATIC
| VT_INLINE
| VT_FUNC
)) {
3759 /* if referencing an inline function, then we generate a
3760 symbol to it if not already done. It will have the
3761 effect to generate code for it at the end of the
3762 compilation unit. Inline function as always
3763 generated in the text section. */
3765 put_extern_sym(s
, text_section
, 0, 0);
3766 r
= VT_SYM
| VT_CONST
;
3770 vset(&s
->type
, r
, s
->c
);
3771 /* if forward reference, we must point to s */
3772 if (vtop
->r
& VT_SYM
) {
3779 /* post operations */
3781 if (tok
== TOK_INC
|| tok
== TOK_DEC
) {
3784 } else if (tok
== '.' || tok
== TOK_ARROW
) {
3787 if (tok
== TOK_ARROW
)
3789 qualifiers
= vtop
->type
.t
& (VT_CONSTANT
| VT_VOLATILE
);
3793 /* expect pointer on structure */
3794 if ((vtop
->type
.t
& VT_BTYPE
) != VT_STRUCT
)
3795 expect("struct or union");
3799 while ((s
= s
->next
) != NULL
) {
3804 tcc_error("field not found: %s", get_tok_str(tok
& ~SYM_FIELD
, NULL
));
3805 /* add field offset to pointer */
3806 vtop
->type
= char_pointer_type
; /* change type to 'char *' */
3809 /* change type to field type, and set to lvalue */
3810 vtop
->type
= s
->type
;
3811 vtop
->type
.t
|= qualifiers
;
3812 /* an array is never an lvalue */
3813 if (!(vtop
->type
.t
& VT_ARRAY
)) {
3814 vtop
->r
|= lvalue_type(vtop
->type
.t
);
3815 #ifdef CONFIG_TCC_BCHECK
3816 /* if bound checking, the referenced pointer must be checked */
3817 if (tcc_state
->do_bounds_check
)
3818 vtop
->r
|= VT_MUSTBOUND
;
3822 } else if (tok
== '[') {
3828 } else if (tok
== '(') {
3834 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
3835 /* pointer test (no array accepted) */
3836 if ((vtop
->type
.t
& (VT_BTYPE
| VT_ARRAY
)) == VT_PTR
) {
3837 vtop
->type
= *pointed_type(&vtop
->type
);
3838 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
)
3842 expect("function pointer");
3845 vtop
->r
&= ~VT_LVAL
; /* no lvalue */
3847 /* get return type */
3850 sa
= s
->next
; /* first parameter */
3853 /* compute first implicit argument if a structure is returned */
3854 if ((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
3855 /* get some space for the returned structure */
3856 size
= type_size(&s
->type
, &align
);
3857 loc
= (loc
- size
) & -align
;
3859 ret
.r
= VT_LOCAL
| VT_LVAL
;
3860 /* pass it as 'int' to avoid structure arg passing
3862 vseti(VT_LOCAL
, loc
);
3867 /* return in register */
3868 if (is_float(ret
.type
.t
)) {
3869 ret
.r
= reg_fret(ret
.type
.t
);
3871 if ((ret
.type
.t
& VT_BTYPE
) == VT_LLONG
)
3880 gfunc_param_typed(s
, sa
);
3890 tcc_error("too few arguments to function");
3892 if (!nocode_wanted
) {
3893 gfunc_call(nb_args
);
3895 vtop
-= (nb_args
+ 1);
3898 vsetc(&ret
.type
, ret
.r
, &ret
.c
);
3906 ST_FUNC
void expr_prod(void)
3911 while (tok
== '*' || tok
== '/' || tok
== '%') {
3919 ST_FUNC
void expr_sum(void)
3924 while (tok
== '+' || tok
== '-') {
3932 static void expr_shift(void)
3937 while (tok
== TOK_SHL
|| tok
== TOK_SAR
) {
3945 static void expr_cmp(void)
3950 while ((tok
>= TOK_ULE
&& tok
<= TOK_GT
) ||
3951 tok
== TOK_ULT
|| tok
== TOK_UGE
) {
3959 static void expr_cmpeq(void)
3964 while (tok
== TOK_EQ
|| tok
== TOK_NE
) {
3972 static void expr_and(void)
3975 while (tok
== '&') {
3982 static void expr_xor(void)
3985 while (tok
== '^') {
3992 static void expr_or(void)
3995 while (tok
== '|') {
4002 /* XXX: fix this mess */
4003 static void expr_land_const(void)
4006 while (tok
== TOK_LAND
) {
4013 /* XXX: fix this mess */
4014 static void expr_lor_const(void)
4017 while (tok
== TOK_LOR
) {
4024 /* only used if non constant */
4025 static void expr_land(void)
4030 if (tok
== TOK_LAND
) {
4035 if (tok
!= TOK_LAND
) {
4045 static void expr_lor(void)
4050 if (tok
== TOK_LOR
) {
4055 if (tok
!= TOK_LOR
) {
4065 /* XXX: better constant handling */
4066 static void expr_cond(void)
4068 int tt
, u
, r1
, r2
, rc
, t1
, t2
, bt1
, bt2
;
4070 CType type
, type1
, type2
;
4077 boolean
.t
= VT_BOOL
;
4083 if (tok
!= ':' || !gnu_ext
) {
4098 if (vtop
!= vstack
) {
4099 /* needed to avoid having different registers saved in
4101 if (is_float(vtop
->type
.t
)) {
4103 #ifdef TCC_TARGET_X86_64
4104 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4114 if (tok
== ':' && gnu_ext
) {
4122 sv
= *vtop
; /* save value to handle it later */
4123 vtop
--; /* no vpop so that FP stack is not flushed */
4131 bt1
= t1
& VT_BTYPE
;
4133 bt2
= t2
& VT_BTYPE
;
4134 /* cast operands to correct type according to ISOC rules */
4135 if (is_float(bt1
) || is_float(bt2
)) {
4136 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
4137 type
.t
= VT_LDOUBLE
;
4138 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
4143 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
4144 /* cast to biggest op */
4146 /* convert to unsigned if it does not fit in a long long */
4147 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
4148 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
4149 type
.t
|= VT_UNSIGNED
;
4150 } else if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
4151 /* If one is a null ptr constant the result type
4153 if (is_null_pointer (vtop
))
4155 else if (is_null_pointer (&sv
))
4157 /* XXX: test pointer compatibility, C99 has more elaborate
4161 } else if (bt1
== VT_FUNC
|| bt2
== VT_FUNC
) {
4162 /* XXX: test function pointer compatibility */
4163 type
= bt1
== VT_FUNC
? type1
: type2
;
4164 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
4165 /* XXX: test structure compatibility */
4166 type
= bt1
== VT_STRUCT
? type1
: type2
;
4167 } else if (bt1
== VT_VOID
|| bt2
== VT_VOID
) {
4168 /* NOTE: as an extension, we accept void on only one side */
4171 /* integer operations */
4173 /* convert to unsigned if it does not fit in an integer */
4174 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
4175 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
4176 type
.t
|= VT_UNSIGNED
;
4179 /* now we convert second operand */
4181 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4184 if (is_float(type
.t
)) {
4186 #ifdef TCC_TARGET_X86_64
4187 if ((type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4191 } else if ((type
.t
& VT_BTYPE
) == VT_LLONG
) {
4192 /* for long longs, we use fixed registers to avoid having
4193 to handle a complicated move */
4198 /* this is horrible, but we must also convert first
4202 /* put again first value and cast it */
4205 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4215 static void expr_eq(void)
4221 (tok
>= TOK_A_MOD
&& tok
<= TOK_A_DIV
) ||
4222 tok
== TOK_A_XOR
|| tok
== TOK_A_OR
||
4223 tok
== TOK_A_SHL
|| tok
== TOK_A_SAR
) {
4238 ST_FUNC
void gexpr(void)
4249 /* parse an expression and return its type without any side effect. */
4250 static void expr_type(CType
*type
)
4252 int saved_nocode_wanted
;
4254 saved_nocode_wanted
= nocode_wanted
;
4259 nocode_wanted
= saved_nocode_wanted
;
4262 /* parse a unary expression and return its type without any side
4264 static void unary_type(CType
*type
)
4276 /* parse a constant expression and return value in vtop. */
4277 static void expr_const1(void)
4286 /* parse an integer constant and return its value. */
4287 ST_FUNC
int expr_const(void)
4291 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
4292 expect("constant expression");
4298 /* return the label token if current token is a label, otherwise
4300 static int is_label(void)
4304 /* fast test first */
4305 if (tok
< TOK_UIDENT
)
4307 /* no need to save tokc because tok is an identifier */
4314 unget_tok(last_tok
);
4319 static void label_or_decl(int l
)
4323 /* fast test first */
4324 if (tok
>= TOK_UIDENT
)
4326 /* no need to save tokc because tok is an identifier */
4330 unget_tok(last_tok
);
4333 unget_tok(last_tok
);
4338 static void block(int *bsym
, int *csym
, int *case_sym
, int *def_sym
,
4339 int case_reg
, int is_expr
)
4344 /* generate line number info */
4345 if (tcc_state
->do_debug
&&
4346 (last_line_num
!= file
->line_num
|| last_ind
!= ind
)) {
4347 put_stabn(N_SLINE
, 0, file
->line_num
, ind
- func_ind
);
4349 last_line_num
= file
->line_num
;
4353 /* default return value is (void) */
4355 vtop
->type
.t
= VT_VOID
;
4358 if (tok
== TOK_IF
) {
4365 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4367 if (c
== TOK_ELSE
) {
4371 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4372 gsym(d
); /* patch else jmp */
4375 } else if (tok
== TOK_WHILE
) {
4383 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4387 } else if (tok
== '{') {
4391 /* record local declaration stack position */
4393 llabel
= local_label_stack
;
4394 /* handle local labels declarations */
4395 if (tok
== TOK_LABEL
) {
4398 if (tok
< TOK_UIDENT
)
4399 expect("label identifier");
4400 label_push(&local_label_stack
, tok
, LABEL_DECLARED
);
4410 while (tok
!= '}') {
4411 label_or_decl(VT_LOCAL
);
4415 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
4418 /* pop locally defined labels */
4419 label_pop(&local_label_stack
, llabel
);
4421 /* XXX: this solution makes only valgrind happy...
4422 triggered by gcc.c-torture/execute/20000917-1.c */
4424 switch(vtop
->type
.t
& VT_BTYPE
) {
4429 for(p
=vtop
->type
.ref
;p
;p
=p
->prev
)
4431 tcc_error("unsupported expression type");
4434 /* pop locally defined symbols */
4435 sym_pop(&local_stack
, s
);
4437 } else if (tok
== TOK_RETURN
) {
4441 gen_assign_cast(&func_vt
);
4442 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
4444 /* if returning structure, must copy it to implicit
4445 first pointer arg location */
4448 size
= type_size(&func_vt
,&align
);
4451 if((vtop
->r
!= (VT_LOCAL
| VT_LVAL
) || (vtop
->c
.i
& 3))
4455 loc
= (loc
- size
) & -4;
4458 vset(&type
, VT_LOCAL
| VT_LVAL
, addr
);
4461 vset(&int_type
, VT_LOCAL
| VT_LVAL
, addr
);
4463 vtop
->type
= int_type
;
4469 vset(&type
, VT_LOCAL
| VT_LVAL
, func_vc
);
4472 /* copy structure value to pointer */
4477 } else if (is_float(func_vt
.t
)) {
4478 gv(rc_fret(func_vt
.t
));
4482 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
4485 rsym
= gjmp(rsym
); /* jmp */
4486 } else if (tok
== TOK_BREAK
) {
4489 tcc_error("cannot break");
4490 *bsym
= gjmp(*bsym
);
4493 } else if (tok
== TOK_CONTINUE
) {
4496 tcc_error("cannot continue");
4497 *csym
= gjmp(*csym
);
4500 } else if (tok
== TOK_FOR
) {
4506 /* c99 for-loop init decl? */
4507 if (!decl0(VT_LOCAL
, 1)) {
4508 /* no, regular for-loop init expr */
4532 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4536 sym_pop(&local_stack
, s
);
4538 if (tok
== TOK_DO
) {
4543 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4554 if (tok
== TOK_SWITCH
) {
4558 /* XXX: other types than integer */
4559 case_reg
= gv(RC_INT
);
4563 b
= gjmp(0); /* jump to first case */
4565 block(&a
, csym
, &b
, &c
, case_reg
, 0);
4566 /* if no default, jmp after switch */
4574 if (tok
== TOK_CASE
) {
4581 if (gnu_ext
&& tok
== TOK_DOTS
) {
4585 tcc_warning("empty case range");
4587 /* since a case is like a label, we must skip it with a jmp */
4594 *case_sym
= gtst(1, 0);
4597 *case_sym
= gtst(1, 0);
4601 *case_sym
= gtst(1, *case_sym
);
4606 goto block_after_label
;
4608 if (tok
== TOK_DEFAULT
) {
4614 tcc_error("too many 'default'");
4617 goto block_after_label
;
4619 if (tok
== TOK_GOTO
) {
4621 if (tok
== '*' && gnu_ext
) {
4625 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
)
4628 } else if (tok
>= TOK_UIDENT
) {
4629 s
= label_find(tok
);
4630 /* put forward definition if needed */
4632 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
4634 if (s
->r
== LABEL_DECLARED
)
4635 s
->r
= LABEL_FORWARD
;
4637 /* label already defined */
4638 if (s
->r
& LABEL_FORWARD
)
4639 s
->jnext
= gjmp(s
->jnext
);
4641 gjmp_addr(s
->jnext
);
4644 expect("label identifier");
4647 } else if (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
) {
4655 if (s
->r
== LABEL_DEFINED
)
4656 tcc_error("duplicate label '%s'", get_tok_str(s
->v
, NULL
));
4658 s
->r
= LABEL_DEFINED
;
4660 s
= label_push(&global_label_stack
, b
, LABEL_DEFINED
);
4663 /* we accept this, but it is a mistake */
4666 tcc_warning("deprecated use of label at end of compound statement");
4670 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
4673 /* expression case */
4688 /* t is the array or struct type. c is the array or struct
4689 address. cur_index/cur_field is the pointer to the current
4690 value. 'size_only' is true if only size info is needed (only used
4692 static void decl_designator(CType
*type
, Section
*sec
, unsigned long c
,
4693 int *cur_index
, Sym
**cur_field
,
4697 int notfirst
, index
, index_last
, align
, l
, nb_elems
, elem_size
;
4703 if (gnu_ext
&& (l
= is_label()) != 0)
4705 while (tok
== '[' || tok
== '.') {
4707 if (!(type
->t
& VT_ARRAY
))
4708 expect("array type");
4711 index
= expr_const();
4712 if (index
< 0 || (s
->c
>= 0 && index
>= s
->c
))
4713 expect("invalid index");
4714 if (tok
== TOK_DOTS
&& gnu_ext
) {
4716 index_last
= expr_const();
4717 if (index_last
< 0 ||
4718 (s
->c
>= 0 && index_last
>= s
->c
) ||
4720 expect("invalid index");
4726 *cur_index
= index_last
;
4727 type
= pointed_type(type
);
4728 elem_size
= type_size(type
, &align
);
4729 c
+= index
* elem_size
;
4730 /* NOTE: we only support ranges for last designator */
4731 nb_elems
= index_last
- index
+ 1;
4732 if (nb_elems
!= 1) {
4741 if ((type
->t
& VT_BTYPE
) != VT_STRUCT
)
4742 expect("struct/union type");
4755 /* XXX: fix this mess by using explicit storage field */
4757 type1
.t
|= (type
->t
& ~VT_TYPE
);
4771 if (type
->t
& VT_ARRAY
) {
4773 type
= pointed_type(type
);
4774 c
+= index
* type_size(type
, &align
);
4778 tcc_error("too many field init");
4779 /* XXX: fix this mess by using explicit storage field */
4781 type1
.t
|= (type
->t
& ~VT_TYPE
);
4786 decl_initializer(type
, sec
, c
, 0, size_only
);
4788 /* XXX: make it more general */
4789 if (!size_only
&& nb_elems
> 1) {
4790 unsigned long c_end
;
4795 tcc_error("range init not supported yet for dynamic storage");
4796 c_end
= c
+ nb_elems
* elem_size
;
4797 if (c_end
> sec
->data_allocated
)
4798 section_realloc(sec
, c_end
);
4799 src
= sec
->data
+ c
;
4801 for(i
= 1; i
< nb_elems
; i
++) {
4803 memcpy(dst
, src
, elem_size
);
4809 #define EXPR_CONST 1
4812 /* store a value or an expression directly in global data or in local array */
4813 static void init_putv(CType
*type
, Section
*sec
, unsigned long c
,
4814 int v
, int expr_type
)
4816 int saved_global_expr
, bt
, bit_pos
, bit_size
;
4818 unsigned long long bit_mask
;
4826 /* compound literals must be allocated globally in this case */
4827 saved_global_expr
= global_expr
;
4830 global_expr
= saved_global_expr
;
4831 /* NOTE: symbols are accepted */
4832 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) != VT_CONST
)
4833 tcc_error("initializer element is not constant");
4841 dtype
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
4844 /* XXX: not portable */
4845 /* XXX: generate error if incorrect relocation */
4846 gen_assign_cast(&dtype
);
4847 bt
= type
->t
& VT_BTYPE
;
4848 /* we'll write at most 12 bytes */
4849 if (c
+ 12 > sec
->data_allocated
) {
4850 section_realloc(sec
, c
+ 12);
4852 ptr
= sec
->data
+ c
;
4853 /* XXX: make code faster ? */
4854 if (!(type
->t
& VT_BITFIELD
)) {
4859 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
4860 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
4861 bit_mask
= (1LL << bit_size
) - 1;
4863 if ((vtop
->r
& VT_SYM
) &&
4869 (bt
== VT_INT
&& bit_size
!= 32)))
4870 tcc_error("initializer element is not computable at load time");
4873 vtop
->c
.i
= (vtop
->c
.i
!= 0);
4875 *(char *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
4878 *(short *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
4881 *(double *)ptr
= vtop
->c
.d
;
4884 *(long double *)ptr
= vtop
->c
.ld
;
4887 *(long long *)ptr
|= (vtop
->c
.ll
& bit_mask
) << bit_pos
;
4890 if (vtop
->r
& VT_SYM
) {
4891 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
4893 *(int *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
4898 vset(&dtype
, VT_LOCAL
|VT_LVAL
, c
);
4905 /* put zeros for variable based init */
4906 static void init_putz(CType
*t
, Section
*sec
, unsigned long c
, int size
)
4909 /* nothing to do because globals are already set to zero */
4911 vpush_global_sym(&func_old_type
, TOK_memset
);
4919 /* 't' contains the type and storage info. 'c' is the offset of the
4920 object in section 'sec'. If 'sec' is NULL, it means stack based
4921 allocation. 'first' is true if array '{' must be read (multi
4922 dimension implicit array init handling). 'size_only' is true if
4923 size only evaluation is wanted (only for arrays). */
4924 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
,
4925 int first
, int size_only
)
4927 int index
, array_length
, n
, no_oblock
, nb
, parlevel
, parlevel1
, i
;
4928 int size1
, align1
, expr_type
;
4932 if (type
->t
& VT_VLA
) {
4933 #if defined TCC_TARGET_I386 || defined TCC_TARGET_X86_64
4937 vpush_global_sym(&func_old_type
, TOK_alloca
);
4938 vla_runtime_type_size(type
, &a
);
4943 vsetc(type
, REG_IRET
, &retcval
);
4944 vset(type
, VT_LOCAL
|VT_LVAL
, c
);
4949 tcc_error("variable length arrays unsupported for this target");
4951 } else if (type
->t
& VT_ARRAY
) {
4955 t1
= pointed_type(type
);
4956 size1
= type_size(t1
, &align1
);
4959 if ((first
&& tok
!= TOK_LSTR
&& tok
!= TOK_STR
) ||
4962 tcc_error("character array initializer must be a literal,"
4963 " optionally enclosed in braces");
4968 /* only parse strings here if correct type (otherwise: handle
4969 them as ((w)char *) expressions */
4970 if ((tok
== TOK_LSTR
&&
4971 #ifdef TCC_TARGET_PE
4972 (t1
->t
& VT_BTYPE
) == VT_SHORT
&& (t1
->t
& VT_UNSIGNED
)
4974 (t1
->t
& VT_BTYPE
) == VT_INT
4976 ) || (tok
== TOK_STR
&& (t1
->t
& VT_BTYPE
) == VT_BYTE
)) {
4977 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
4982 /* compute maximum number of chars wanted */
4984 cstr_len
= cstr
->size
;
4986 cstr_len
= cstr
->size
/ sizeof(nwchar_t
);
4989 if (n
>= 0 && nb
> (n
- array_length
))
4990 nb
= n
- array_length
;
4993 tcc_warning("initializer-string for array is too long");
4994 /* in order to go faster for common case (char
4995 string in global variable, we handle it
4997 if (sec
&& tok
== TOK_STR
&& size1
== 1) {
4998 memcpy(sec
->data
+ c
+ array_length
, cstr
->data
, nb
);
5002 ch
= ((unsigned char *)cstr
->data
)[i
];
5004 ch
= ((nwchar_t
*)cstr
->data
)[i
];
5005 init_putv(t1
, sec
, c
+ (array_length
+ i
) * size1
,
5013 /* only add trailing zero if enough storage (no
5014 warning in this case since it is standard) */
5015 if (n
< 0 || array_length
< n
) {
5017 init_putv(t1
, sec
, c
+ (array_length
* size1
), 0, EXPR_VAL
);
5023 while (tok
!= '}') {
5024 decl_designator(type
, sec
, c
, &index
, NULL
, size_only
);
5025 if (n
>= 0 && index
>= n
)
5026 tcc_error("index too large");
5027 /* must put zero in holes (note that doing it that way
5028 ensures that it even works with designators) */
5029 if (!size_only
&& array_length
< index
) {
5030 init_putz(t1
, sec
, c
+ array_length
* size1
,
5031 (index
- array_length
) * size1
);
5034 if (index
> array_length
)
5035 array_length
= index
;
5036 /* special test for multi dimensional arrays (may not
5037 be strictly correct if designators are used at the
5039 if (index
>= n
&& no_oblock
)
5048 /* put zeros at the end */
5049 if (!size_only
&& n
>= 0 && array_length
< n
) {
5050 init_putz(t1
, sec
, c
+ array_length
* size1
,
5051 (n
- array_length
) * size1
);
5053 /* patch type size if needed */
5055 s
->c
= array_length
;
5056 } else if ((type
->t
& VT_BTYPE
) == VT_STRUCT
&&
5057 (sec
|| !first
|| tok
== '{')) {
5060 /* NOTE: the previous test is a specific case for automatic
5061 struct/union init */
5062 /* XXX: union needs only one init */
5064 /* XXX: this test is incorrect for local initializers
5065 beginning with ( without {. It would be much more difficult
5066 to do it correctly (ideally, the expression parser should
5067 be used in all cases) */
5073 while (tok
== '(') {
5077 if (!parse_btype(&type1
, &ad1
))
5079 type_decl(&type1
, &ad1
, &n
, TYPE_ABSTRACT
);
5081 if (!is_assignable_types(type
, &type1
))
5082 tcc_error("invalid type for cast");
5087 if (first
|| tok
== '{') {
5096 while (tok
!= '}') {
5097 decl_designator(type
, sec
, c
, NULL
, &f
, size_only
);
5099 if (!size_only
&& array_length
< index
) {
5100 init_putz(type
, sec
, c
+ array_length
,
5101 index
- array_length
);
5103 index
= index
+ type_size(&f
->type
, &align1
);
5104 if (index
> array_length
)
5105 array_length
= index
;
5107 /* gr: skip fields from same union - ugly. */
5109 ///printf("index: %2d %08x -- %2d %08x\n", f->c, f->type.t, f->next->c, f->next->type.t);
5110 /* test for same offset */
5111 if (f
->next
->c
!= f
->c
)
5113 /* if yes, test for bitfield shift */
5114 if ((f
->type
.t
& VT_BITFIELD
) && (f
->next
->type
.t
& VT_BITFIELD
)) {
5115 int bit_pos_1
= (f
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5116 int bit_pos_2
= (f
->next
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5117 //printf("bitfield %d %d\n", bit_pos_1, bit_pos_2);
5118 if (bit_pos_1
!= bit_pos_2
)
5125 if (no_oblock
&& f
== NULL
)
5131 /* put zeros at the end */
5132 if (!size_only
&& array_length
< n
) {
5133 init_putz(type
, sec
, c
+ array_length
,
5142 } else if (tok
== '{') {
5144 decl_initializer(type
, sec
, c
, first
, size_only
);
5146 } else if (size_only
) {
5147 /* just skip expression */
5148 parlevel
= parlevel1
= 0;
5149 while ((parlevel
> 0 || parlevel1
> 0 ||
5150 (tok
!= '}' && tok
!= ',')) && tok
!= -1) {
5153 else if (tok
== ')')
5155 else if (tok
== '{')
5157 else if (tok
== '}')
5162 /* currently, we always use constant expression for globals
5163 (may change for scripting case) */
5164 expr_type
= EXPR_CONST
;
5166 expr_type
= EXPR_ANY
;
5167 init_putv(type
, sec
, c
, 0, expr_type
);
5171 /* parse an initializer for type 't' if 'has_init' is non zero, and
5172 allocate space in local or global data space ('r' is either
5173 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
5174 variable 'v' with an associated name represented by 'asm_label' of
5175 scope 'scope' is declared before initializers are parsed. If 'v' is
5176 zero, then a reference to the new object is put in the value stack.
5177 If 'has_init' is 2, a special parsing is done to handle string
5179 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
,
5180 int has_init
, int v
, char *asm_label
,
5183 int size
, align
, addr
, data_offset
;
5185 ParseState saved_parse_state
= {0};
5186 TokenString init_str
;
5188 Sym
*flexible_array
;
5190 flexible_array
= NULL
;
5191 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
5194 while (field
&& field
->next
)
5195 field
= field
->next
;
5196 if (field
->type
.t
& VT_ARRAY
&& field
->type
.ref
->c
< 0)
5197 flexible_array
= field
;
5200 size
= type_size(type
, &align
);
5201 /* If unknown size, we must evaluate it before
5202 evaluating initializers because
5203 initializers can generate global data too
5204 (e.g. string pointers or ISOC99 compound
5205 literals). It also simplifies local
5206 initializers handling */
5207 tok_str_new(&init_str
);
5208 if (size
< 0 || (flexible_array
&& has_init
)) {
5210 tcc_error("unknown type size");
5211 /* get all init string */
5212 if (has_init
== 2) {
5213 /* only get strings */
5214 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5215 tok_str_add_tok(&init_str
);
5220 while (level
> 0 || (tok
!= ',' && tok
!= ';')) {
5222 tcc_error("unexpected end of file in initializer");
5223 tok_str_add_tok(&init_str
);
5226 else if (tok
== '}') {
5236 tok_str_add(&init_str
, -1);
5237 tok_str_add(&init_str
, 0);
5240 save_parse_state(&saved_parse_state
);
5242 macro_ptr
= init_str
.str
;
5244 decl_initializer(type
, NULL
, 0, 1, 1);
5245 /* prepare second initializer parsing */
5246 macro_ptr
= init_str
.str
;
5249 /* if still unknown size, error */
5250 size
= type_size(type
, &align
);
5252 tcc_error("unknown type size");
5255 size
+= flexible_array
->type
.ref
->c
* pointed_size(&flexible_array
->type
);
5256 /* take into account specified alignment if bigger */
5258 if (ad
->aligned
> align
)
5259 align
= ad
->aligned
;
5260 } else if (ad
->packed
) {
5263 if ((r
& VT_VALMASK
) == VT_LOCAL
) {
5265 #ifdef CONFIG_TCC_BCHECK
5266 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5270 loc
= (loc
- size
) & -align
;
5272 #ifdef CONFIG_TCC_BCHECK
5273 /* handles bounds */
5274 /* XXX: currently, since we do only one pass, we cannot track
5275 '&' operators, so we add only arrays */
5276 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5277 unsigned long *bounds_ptr
;
5278 /* add padding between regions */
5280 /* then add local bound info */
5281 bounds_ptr
= section_ptr_add(lbounds_section
, 2 * sizeof(unsigned long));
5282 bounds_ptr
[0] = addr
;
5283 bounds_ptr
[1] = size
;
5287 /* local variable */
5288 sym_push(v
, type
, r
, addr
);
5290 /* push local reference */
5291 vset(type
, r
, addr
);
5297 if (v
&& scope
== VT_CONST
) {
5298 /* see if the symbol was already defined */
5301 if (!is_compatible_types(&sym
->type
, type
))
5302 tcc_error("incompatible types for redefinition of '%s'",
5303 get_tok_str(v
, NULL
));
5304 if (sym
->type
.t
& VT_EXTERN
) {
5305 /* if the variable is extern, it was not allocated */
5306 sym
->type
.t
&= ~VT_EXTERN
;
5307 /* set array size if it was ommited in extern
5309 if ((sym
->type
.t
& VT_ARRAY
) &&
5310 sym
->type
.ref
->c
< 0 &&
5312 sym
->type
.ref
->c
= type
->ref
->c
;
5314 /* we accept several definitions of the same
5315 global variable. this is tricky, because we
5316 must play with the SHN_COMMON type of the symbol */
5317 /* XXX: should check if the variable was already
5318 initialized. It is incorrect to initialized it
5320 /* no init data, we won't add more to the symbol */
5327 /* allocate symbol in corresponding section */
5332 else if (tcc_state
->nocommon
)
5336 data_offset
= sec
->data_offset
;
5337 data_offset
= (data_offset
+ align
- 1) & -align
;
5339 /* very important to increment global pointer at this time
5340 because initializers themselves can create new initializers */
5341 data_offset
+= size
;
5342 #ifdef CONFIG_TCC_BCHECK
5343 /* add padding if bound check */
5344 if (tcc_state
->do_bounds_check
)
5347 sec
->data_offset
= data_offset
;
5348 /* allocate section space to put the data */
5349 if (sec
->sh_type
!= SHT_NOBITS
&&
5350 data_offset
> sec
->data_allocated
)
5351 section_realloc(sec
, data_offset
);
5352 /* align section if needed */
5353 if (align
> sec
->sh_addralign
)
5354 sec
->sh_addralign
= align
;
5356 addr
= 0; /* avoid warning */
5360 if (scope
!= VT_CONST
|| !sym
) {
5361 sym
= sym_push(v
, type
, r
| VT_SYM
, 0);
5362 sym
->asm_label
= asm_label
;
5364 /* update symbol definition */
5366 put_extern_sym(sym
, sec
, addr
, size
);
5369 /* put a common area */
5370 put_extern_sym(sym
, NULL
, align
, size
);
5371 /* XXX: find a nicer way */
5372 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
5373 esym
->st_shndx
= SHN_COMMON
;
5378 /* push global reference */
5379 sym
= get_sym_ref(type
, sec
, addr
, size
);
5381 vsetc(type
, VT_CONST
| VT_SYM
, &cval
);
5384 /* patch symbol weakness */
5385 if (type
->t
& VT_WEAK
)
5387 #ifdef CONFIG_TCC_BCHECK
5388 /* handles bounds now because the symbol must be defined
5389 before for the relocation */
5390 if (tcc_state
->do_bounds_check
) {
5391 unsigned long *bounds_ptr
;
5393 greloc(bounds_section
, sym
, bounds_section
->data_offset
, R_DATA_PTR
);
5394 /* then add global bound info */
5395 bounds_ptr
= section_ptr_add(bounds_section
, 2 * sizeof(long));
5396 bounds_ptr
[0] = 0; /* relocated */
5397 bounds_ptr
[1] = size
;
5401 if (has_init
|| (type
->t
& VT_VLA
)) {
5402 decl_initializer(type
, sec
, addr
, 1, 0);
5403 /* restore parse state if needed */
5405 tok_str_free(init_str
.str
);
5406 restore_parse_state(&saved_parse_state
);
5408 /* patch flexible array member size back to -1, */
5409 /* for possible subsequent similar declarations */
5411 flexible_array
->type
.ref
->c
= -1;
5416 static void put_func_debug(Sym
*sym
)
5421 /* XXX: we put here a dummy type */
5422 snprintf(buf
, sizeof(buf
), "%s:%c1",
5423 funcname
, sym
->type
.t
& VT_STATIC
? 'f' : 'F');
5424 put_stabs_r(buf
, N_FUN
, 0, file
->line_num
, 0,
5425 cur_text_section
, sym
->c
);
5426 /* //gr gdb wants a line at the function */
5427 put_stabn(N_SLINE
, 0, file
->line_num
, 0);
5432 /* parse an old style function declaration list */
5433 /* XXX: check multiple parameter */
5434 static void func_decl_list(Sym
*func_sym
)
5441 /* parse each declaration */
5442 while (tok
!= '{' && tok
!= ';' && tok
!= ',' && tok
!= TOK_EOF
&&
5443 tok
!= TOK_ASM1
&& tok
!= TOK_ASM2
&& tok
!= TOK_ASM3
) {
5444 if (!parse_btype(&btype
, &ad
))
5445 expect("declaration list");
5446 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
5447 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
5449 /* we accept no variable after */
5453 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
5454 /* find parameter in function parameter list */
5457 if ((s
->v
& ~SYM_FIELD
) == v
)
5461 tcc_error("declaration for parameter '%s' but no such parameter",
5462 get_tok_str(v
, NULL
));
5464 /* check that no storage specifier except 'register' was given */
5465 if (type
.t
& VT_STORAGE
)
5466 tcc_error("storage class specified for '%s'", get_tok_str(v
, NULL
));
5467 convert_parameter_type(&type
);
5468 /* we can add the type (NOTE: it could be local to the function) */
5470 /* accept other parameters */
5481 /* parse a function defined by symbol 'sym' and generate its code in
5482 'cur_text_section' */
5483 static void gen_function(Sym
*sym
)
5485 int saved_nocode_wanted
= nocode_wanted
;
5487 ind
= cur_text_section
->data_offset
;
5488 /* NOTE: we patch the symbol size later */
5489 put_extern_sym(sym
, cur_text_section
, ind
, 0);
5490 funcname
= get_tok_str(sym
->v
, NULL
);
5492 /* put debug symbol */
5493 if (tcc_state
->do_debug
)
5494 put_func_debug(sym
);
5495 /* push a dummy symbol to enable local sym storage */
5496 sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
5497 gfunc_prolog(&sym
->type
);
5499 block(NULL
, NULL
, NULL
, NULL
, 0, 0);
5502 cur_text_section
->data_offset
= ind
;
5503 label_pop(&global_label_stack
, NULL
);
5504 sym_pop(&local_stack
, NULL
); /* reset local stack */
5505 /* end of function */
5506 /* patch symbol size */
5507 ((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
].st_size
=
5509 /* patch symbol weakness (this definition overrules any prototype) */
5510 if (sym
->type
.t
& VT_WEAK
)
5512 if (tcc_state
->do_debug
) {
5513 put_stabn(N_FUN
, 0, 0, ind
- func_ind
);
5515 /* It's better to crash than to generate wrong code */
5516 cur_text_section
= NULL
;
5517 funcname
= ""; /* for safety */
5518 func_vt
.t
= VT_VOID
; /* for safety */
5519 ind
= 0; /* for safety */
5520 nocode_wanted
= saved_nocode_wanted
;
5523 ST_FUNC
void gen_inline_functions(void)
5526 int *str
, inline_generated
, i
;
5527 struct InlineFunc
*fn
;
5529 /* iterate while inline function are referenced */
5531 inline_generated
= 0;
5532 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
5533 fn
= tcc_state
->inline_fns
[i
];
5535 if (sym
&& sym
->c
) {
5536 /* the function was used: generate its code and
5537 convert it to a normal function */
5538 str
= fn
->token_str
;
5541 strcpy(file
->filename
, fn
->filename
);
5542 sym
->r
= VT_SYM
| VT_CONST
;
5543 sym
->type
.t
&= ~VT_INLINE
;
5547 cur_text_section
= text_section
;
5549 macro_ptr
= NULL
; /* fail safe */
5551 inline_generated
= 1;
5554 if (!inline_generated
)
5557 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
5558 fn
= tcc_state
->inline_fns
[i
];
5559 str
= fn
->token_str
;
5562 dynarray_reset(&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
);
5565 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
5566 static int decl0(int l
, int is_for_loop_init
)
5574 if (!parse_btype(&btype
, &ad
)) {
5575 if (is_for_loop_init
)
5577 /* skip redundant ';' */
5578 /* XXX: find more elegant solution */
5583 if (l
== VT_CONST
&&
5584 (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
5585 /* global asm block */
5589 /* special test for old K&R protos without explicit int
5590 type. Only accepted when defining global data */
5591 if (l
== VT_LOCAL
|| tok
< TOK_DEFINE
)
5595 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
5596 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
5598 /* we accept no variable after */
5602 while (1) { /* iterate thru each declaration */
5603 char *asm_label
; // associated asm label
5605 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
5609 type_to_str(buf
, sizeof(buf
), t
, get_tok_str(v
, NULL
));
5610 printf("type = '%s'\n", buf
);
5613 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
5614 if ((type
.t
& VT_STATIC
) && (l
== VT_LOCAL
)) {
5615 tcc_error("function without file scope cannot be static");
5617 /* if old style function prototype, we accept a
5620 if (sym
->c
== FUNC_OLD
)
5621 func_decl_list(sym
);
5625 if (gnu_ext
&& (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
5628 asm_label_instr(&astr
);
5629 asm_label
= tcc_strdup(astr
.data
);
5632 /* parse one last attribute list, after asm label */
5633 parse_attribute(&ad
);
5638 #ifdef TCC_TARGET_PE
5640 type
.t
|= VT_IMPORT
;
5642 type
.t
|= VT_EXPORT
;
5646 tcc_error("cannot use local functions");
5647 if ((type
.t
& VT_BTYPE
) != VT_FUNC
)
5648 expect("function definition");
5650 /* reject abstract declarators in function definition */
5652 while ((sym
= sym
->next
) != NULL
)
5653 if (!(sym
->v
& ~SYM_FIELD
))
5654 expect("identifier");
5656 /* XXX: cannot do better now: convert extern line to static inline */
5657 if ((type
.t
& (VT_EXTERN
| VT_INLINE
)) == (VT_EXTERN
| VT_INLINE
))
5658 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
5662 if ((sym
->type
.t
& VT_BTYPE
) != VT_FUNC
)
5665 r
= sym
->type
.ref
->r
;
5666 /* use func_call from prototype if not defined */
5667 if (FUNC_CALL(r
) != FUNC_CDECL
5668 && FUNC_CALL(type
.ref
->r
) == FUNC_CDECL
)
5669 FUNC_CALL(type
.ref
->r
) = FUNC_CALL(r
);
5671 /* use export from prototype */
5673 FUNC_EXPORT(type
.ref
->r
) = 1;
5675 /* use static from prototype */
5676 if (sym
->type
.t
& VT_STATIC
)
5677 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
5679 if (!is_compatible_types(&sym
->type
, &type
)) {
5681 tcc_error("incompatible types for redefinition of '%s'",
5682 get_tok_str(v
, NULL
));
5684 /* if symbol is already defined, then put complete type */
5687 /* put function symbol */
5688 sym
= global_identifier_push(v
, type
.t
, 0);
5689 sym
->type
.ref
= type
.ref
;
5692 /* static inline functions are just recorded as a kind
5693 of macro. Their code will be emitted at the end of
5694 the compilation unit only if they are used */
5695 if ((type
.t
& (VT_INLINE
| VT_STATIC
)) ==
5696 (VT_INLINE
| VT_STATIC
)) {
5697 TokenString func_str
;
5699 struct InlineFunc
*fn
;
5700 const char *filename
;
5702 tok_str_new(&func_str
);
5708 tcc_error("unexpected end of file");
5709 tok_str_add_tok(&func_str
);
5714 } else if (t
== '}') {
5716 if (block_level
== 0)
5720 tok_str_add(&func_str
, -1);
5721 tok_str_add(&func_str
, 0);
5722 filename
= file
? file
->filename
: "";
5723 fn
= tcc_malloc(sizeof *fn
+ strlen(filename
));
5724 strcpy(fn
->filename
, filename
);
5726 fn
->token_str
= func_str
.str
;
5727 dynarray_add((void ***)&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
, fn
);
5730 /* compute text section */
5731 cur_text_section
= ad
.section
;
5732 if (!cur_text_section
)
5733 cur_text_section
= text_section
;
5734 sym
->r
= VT_SYM
| VT_CONST
;
5739 if (btype
.t
& VT_TYPEDEF
) {
5740 /* save typedefed type */
5741 /* XXX: test storage specifiers ? */
5742 sym
= sym_push(v
, &type
, INT_ATTR(&ad
), 0);
5743 sym
->type
.t
|= VT_TYPEDEF
;
5746 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
5747 /* external function definition */
5748 /* specific case for func_call attribute */
5749 type
.ref
->r
= INT_ATTR(&ad
);
5750 } else if (!(type
.t
& VT_ARRAY
)) {
5751 /* not lvalue if array */
5752 r
|= lvalue_type(type
.t
);
5754 has_init
= (tok
== '=');
5755 if (has_init
&& (type
.t
& VT_VLA
))
5756 tcc_error("Variable length array cannot be initialized");
5757 if ((btype
.t
& VT_EXTERN
) || ((type
.t
& VT_BTYPE
) == VT_FUNC
) ||
5758 ((type
.t
& VT_ARRAY
) && (type
.t
& VT_STATIC
) &&
5759 !has_init
&& l
== VT_CONST
&& type
.ref
->c
< 0)) {
5760 /* external variable or function */
5761 /* NOTE: as GCC, uninitialized global static
5762 arrays of null size are considered as
5764 sym
= external_sym(v
, &type
, r
, asm_label
);
5766 if (type
.t
& VT_WEAK
)
5769 if (ad
.alias_target
) {
5774 alias_target
= sym_find(ad
.alias_target
);
5775 if (!alias_target
|| !alias_target
->c
)
5776 tcc_error("unsupported forward __alias__ attribute");
5777 esym
= &((Elf32_Sym
*)symtab_section
->data
)[alias_target
->c
];
5778 tsec
.sh_num
= esym
->st_shndx
;
5779 put_extern_sym2(sym
, &tsec
, esym
->st_value
, esym
->st_size
, 0);
5782 type
.t
|= (btype
.t
& VT_STATIC
); /* Retain "static". */
5783 if (type
.t
& VT_STATIC
)
5789 decl_initializer_alloc(&type
, &ad
, r
, has_init
, v
, asm_label
, l
);
5793 if (is_for_loop_init
)
5806 ST_FUNC
void decl(int l
)