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 (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
1682 /* cast to biggest op */
1684 /* convert to unsigned if it does not fit in a long long */
1685 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
1686 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
1690 /* integer operations */
1692 /* convert to unsigned if it does not fit in an integer */
1693 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
1694 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
1697 /* XXX: currently, some unsigned operations are explicit, so
1698 we modify them here */
1699 if (t
& VT_UNSIGNED
) {
1706 else if (op
== TOK_LT
)
1708 else if (op
== TOK_GT
)
1710 else if (op
== TOK_LE
)
1712 else if (op
== TOK_GE
)
1719 /* special case for shifts and long long: we keep the shift as
1721 if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
)
1728 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
1729 /* relationnal op: the result is an int */
1730 vtop
->type
.t
= VT_INT
;
1737 #ifndef TCC_TARGET_ARM
1738 /* generic itof for unsigned long long case */
1739 static void gen_cvt_itof1(int t
)
1741 if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
1742 (VT_LLONG
| VT_UNSIGNED
)) {
1745 vpush_global_sym(&func_old_type
, TOK___floatundisf
);
1746 #if LDOUBLE_SIZE != 8
1747 else if (t
== VT_LDOUBLE
)
1748 vpush_global_sym(&func_old_type
, TOK___floatundixf
);
1751 vpush_global_sym(&func_old_type
, TOK___floatundidf
);
1755 vtop
->r
= reg_fret(t
);
1762 /* generic ftoi for unsigned long long case */
1763 static void gen_cvt_ftoi1(int t
)
1767 if (t
== (VT_LLONG
| VT_UNSIGNED
)) {
1768 /* not handled natively */
1769 st
= vtop
->type
.t
& VT_BTYPE
;
1771 vpush_global_sym(&func_old_type
, TOK___fixunssfdi
);
1772 #if LDOUBLE_SIZE != 8
1773 else if (st
== VT_LDOUBLE
)
1774 vpush_global_sym(&func_old_type
, TOK___fixunsxfdi
);
1777 vpush_global_sym(&func_old_type
, TOK___fixunsdfdi
);
1782 vtop
->r2
= REG_LRET
;
1788 /* force char or short cast */
1789 static void force_charshort_cast(int t
)
1793 /* XXX: add optimization if lvalue : just change type and offset */
1798 if (t
& VT_UNSIGNED
) {
1799 vpushi((1 << bits
) - 1);
1805 /* result must be signed or the SAR is converted to an SHL
1806 This was not the case when "t" was a signed short
1807 and the last value on the stack was an unsigned int */
1808 vtop
->type
.t
&= ~VT_UNSIGNED
;
1814 /* cast 'vtop' to 'type'. Casting to bitfields is forbidden. */
1815 static void gen_cast(CType
*type
)
1817 int sbt
, dbt
, sf
, df
, c
, p
;
1819 /* special delayed cast for char/short */
1820 /* XXX: in some cases (multiple cascaded casts), it may still
1822 if (vtop
->r
& VT_MUSTCAST
) {
1823 vtop
->r
&= ~VT_MUSTCAST
;
1824 force_charshort_cast(vtop
->type
.t
);
1827 /* bitfields first get cast to ints */
1828 if (vtop
->type
.t
& VT_BITFIELD
) {
1832 dbt
= type
->t
& (VT_BTYPE
| VT_UNSIGNED
);
1833 sbt
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
1838 c
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1839 p
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
);
1841 /* constant case: we can do it now */
1842 /* XXX: in ISOC, cannot do it if error in convert */
1843 if (sbt
== VT_FLOAT
)
1844 vtop
->c
.ld
= vtop
->c
.f
;
1845 else if (sbt
== VT_DOUBLE
)
1846 vtop
->c
.ld
= vtop
->c
.d
;
1849 if ((sbt
& VT_BTYPE
) == VT_LLONG
) {
1850 if (sbt
& VT_UNSIGNED
)
1851 vtop
->c
.ld
= vtop
->c
.ull
;
1853 vtop
->c
.ld
= vtop
->c
.ll
;
1855 if (sbt
& VT_UNSIGNED
)
1856 vtop
->c
.ld
= vtop
->c
.ui
;
1858 vtop
->c
.ld
= vtop
->c
.i
;
1861 if (dbt
== VT_FLOAT
)
1862 vtop
->c
.f
= (float)vtop
->c
.ld
;
1863 else if (dbt
== VT_DOUBLE
)
1864 vtop
->c
.d
= (double)vtop
->c
.ld
;
1865 } else if (sf
&& dbt
== (VT_LLONG
|VT_UNSIGNED
)) {
1866 vtop
->c
.ull
= (unsigned long long)vtop
->c
.ld
;
1867 } else if (sf
&& dbt
== VT_BOOL
) {
1868 vtop
->c
.i
= (vtop
->c
.ld
!= 0);
1871 vtop
->c
.ll
= (long long)vtop
->c
.ld
;
1872 else if (sbt
== (VT_LLONG
|VT_UNSIGNED
))
1873 vtop
->c
.ll
= vtop
->c
.ull
;
1874 else if (sbt
& VT_UNSIGNED
)
1875 vtop
->c
.ll
= vtop
->c
.ui
;
1876 #ifdef TCC_TARGET_X86_64
1877 else if (sbt
== VT_PTR
)
1880 else if (sbt
!= VT_LLONG
)
1881 vtop
->c
.ll
= vtop
->c
.i
;
1883 if (dbt
== (VT_LLONG
|VT_UNSIGNED
))
1884 vtop
->c
.ull
= vtop
->c
.ll
;
1885 else if (dbt
== VT_BOOL
)
1886 vtop
->c
.i
= (vtop
->c
.ll
!= 0);
1887 else if (dbt
!= VT_LLONG
) {
1889 if ((dbt
& VT_BTYPE
) == VT_BYTE
)
1891 else if ((dbt
& VT_BTYPE
) == VT_SHORT
)
1894 if(dbt
& VT_UNSIGNED
)
1895 vtop
->c
.ui
= ((unsigned int)vtop
->c
.ll
<< s
) >> s
;
1897 vtop
->c
.i
= ((int)vtop
->c
.ll
<< s
) >> s
;
1900 } else if (p
&& dbt
== VT_BOOL
) {
1903 } else if (!nocode_wanted
) {
1904 /* non constant case: generate code */
1906 /* convert from fp to fp */
1909 /* convert int to fp */
1912 /* convert fp to int */
1913 if (dbt
== VT_BOOL
) {
1917 /* we handle char/short/etc... with generic code */
1918 if (dbt
!= (VT_INT
| VT_UNSIGNED
) &&
1919 dbt
!= (VT_LLONG
| VT_UNSIGNED
) &&
1923 if (dbt
== VT_INT
&& (type
->t
& (VT_BTYPE
| VT_UNSIGNED
)) != dbt
) {
1924 /* additional cast for char/short... */
1929 #ifndef TCC_TARGET_X86_64
1930 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
) {
1931 if ((sbt
& VT_BTYPE
) != VT_LLONG
) {
1932 /* scalar to long long */
1933 /* machine independent conversion */
1935 /* generate high word */
1936 if (sbt
== (VT_INT
| VT_UNSIGNED
)) {
1940 if (sbt
== VT_PTR
) {
1941 /* cast from pointer to int before we apply
1942 shift operation, which pointers don't support*/
1943 gen_cast(&int_type
);
1949 /* patch second register */
1950 vtop
[-1].r2
= vtop
->r
;
1954 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
||
1955 (dbt
& VT_BTYPE
) == VT_PTR
||
1956 (dbt
& VT_BTYPE
) == VT_FUNC
) {
1957 if ((sbt
& VT_BTYPE
) != VT_LLONG
&&
1958 (sbt
& VT_BTYPE
) != VT_PTR
&&
1959 (sbt
& VT_BTYPE
) != VT_FUNC
) {
1960 /* need to convert from 32bit to 64bit */
1962 if (sbt
!= (VT_INT
| VT_UNSIGNED
)) {
1963 /* x86_64 specific: movslq */
1965 o(0xc0 + (REG_VALUE(r
) << 3) + REG_VALUE(r
));
1969 } else if (dbt
== VT_BOOL
) {
1970 /* scalar to bool */
1973 } else if ((dbt
& VT_BTYPE
) == VT_BYTE
||
1974 (dbt
& VT_BTYPE
) == VT_SHORT
) {
1975 if (sbt
== VT_PTR
) {
1976 vtop
->type
.t
= VT_INT
;
1977 tcc_warning("nonportable conversion from pointer to char/short");
1979 force_charshort_cast(dbt
);
1980 } else if ((dbt
& VT_BTYPE
) == VT_INT
) {
1982 if (sbt
== VT_LLONG
) {
1983 /* from long long: just take low order word */
1987 /* if lvalue and single word type, nothing to do because
1988 the lvalue already contains the real type size (see
1989 VT_LVAL_xxx constants) */
1992 } else if ((dbt
& VT_BTYPE
) == VT_PTR
&& !(vtop
->r
& VT_LVAL
)) {
1993 /* if we are casting between pointer types,
1994 we must update the VT_LVAL_xxx size */
1995 vtop
->r
= (vtop
->r
& ~VT_LVAL_TYPE
)
1996 | (lvalue_type(type
->ref
->type
.t
) & VT_LVAL_TYPE
);
2001 /* return type size as known at compile time. Put alignment at 'a' */
2002 ST_FUNC
int type_size(CType
*type
, int *a
)
2007 bt
= type
->t
& VT_BTYPE
;
2008 if (bt
== VT_STRUCT
) {
2013 } else if (bt
== VT_PTR
) {
2014 if (type
->t
& VT_ARRAY
) {
2018 ts
= type_size(&s
->type
, a
);
2020 if (ts
< 0 && s
->c
< 0)
2028 } else if (bt
== VT_LDOUBLE
) {
2030 return LDOUBLE_SIZE
;
2031 } else if (bt
== VT_DOUBLE
|| bt
== VT_LLONG
) {
2032 #ifdef TCC_TARGET_I386
2033 #ifdef TCC_TARGET_PE
2038 #elif defined(TCC_TARGET_ARM)
2048 } else if (bt
== VT_INT
|| bt
== VT_ENUM
|| bt
== VT_FLOAT
) {
2051 } else if (bt
== VT_SHORT
) {
2055 /* char, void, function, _Bool */
2061 /* push type size as known at runtime time on top of value stack. Put
2063 ST_FUNC
void vla_runtime_type_size(CType
*type
, int *a
)
2065 if (type
->t
& VT_VLA
) {
2066 vset(&int_type
, VT_LOCAL
|VT_LVAL
, type
->ref
->c
);
2068 vpushi(type_size(type
, a
));
2072 /* return the pointed type of t */
2073 static inline CType
*pointed_type(CType
*type
)
2075 return &type
->ref
->type
;
2078 /* modify type so that its it is a pointer to type. */
2079 ST_FUNC
void mk_pointer(CType
*type
)
2082 s
= sym_push(SYM_FIELD
, type
, 0, -1);
2083 type
->t
= VT_PTR
| (type
->t
& ~VT_TYPE
);
2087 /* compare function types. OLD functions match any new functions */
2088 static int is_compatible_func(CType
*type1
, CType
*type2
)
2094 if (!is_compatible_types(&s1
->type
, &s2
->type
))
2096 /* check func_call */
2097 if (FUNC_CALL(s1
->r
) != FUNC_CALL(s2
->r
))
2099 /* XXX: not complete */
2100 if (s1
->c
== FUNC_OLD
|| s2
->c
== FUNC_OLD
)
2104 while (s1
!= NULL
) {
2107 if (!is_compatible_parameter_types(&s1
->type
, &s2
->type
))
2117 /* return true if type1 and type2 are the same. If unqualified is
2118 true, qualifiers on the types are ignored.
2120 - enums are not checked as gcc __builtin_types_compatible_p ()
2122 static int compare_types(CType
*type1
, CType
*type2
, int unqualified
)
2126 t1
= type1
->t
& VT_TYPE
;
2127 t2
= type2
->t
& VT_TYPE
;
2129 /* strip qualifiers before comparing */
2130 t1
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2131 t2
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2133 /* XXX: bitfields ? */
2136 /* test more complicated cases */
2137 bt1
= t1
& VT_BTYPE
;
2138 if (bt1
== VT_PTR
) {
2139 type1
= pointed_type(type1
);
2140 type2
= pointed_type(type2
);
2141 return is_compatible_types(type1
, type2
);
2142 } else if (bt1
== VT_STRUCT
) {
2143 return (type1
->ref
== type2
->ref
);
2144 } else if (bt1
== VT_FUNC
) {
2145 return is_compatible_func(type1
, type2
);
2151 /* return true if type1 and type2 are exactly the same (including
2154 static int is_compatible_types(CType
*type1
, CType
*type2
)
2156 return compare_types(type1
,type2
,0);
2159 /* return true if type1 and type2 are the same (ignoring qualifiers).
2161 static int is_compatible_parameter_types(CType
*type1
, CType
*type2
)
2163 return compare_types(type1
,type2
,1);
2166 /* print a type. If 'varstr' is not NULL, then the variable is also
2167 printed in the type */
2169 /* XXX: add array and function pointers */
2170 static void type_to_str(char *buf
, int buf_size
,
2171 CType
*type
, const char *varstr
)
2178 t
= type
->t
& VT_TYPE
;
2181 if (t
& VT_CONSTANT
)
2182 pstrcat(buf
, buf_size
, "const ");
2183 if (t
& VT_VOLATILE
)
2184 pstrcat(buf
, buf_size
, "volatile ");
2185 if (t
& VT_UNSIGNED
)
2186 pstrcat(buf
, buf_size
, "unsigned ");
2216 tstr
= "long double";
2218 pstrcat(buf
, buf_size
, tstr
);
2222 if (bt
== VT_STRUCT
)
2226 pstrcat(buf
, buf_size
, tstr
);
2227 v
= type
->ref
->v
& ~SYM_STRUCT
;
2228 if (v
>= SYM_FIRST_ANOM
)
2229 pstrcat(buf
, buf_size
, "<anonymous>");
2231 pstrcat(buf
, buf_size
, get_tok_str(v
, NULL
));
2235 type_to_str(buf
, buf_size
, &s
->type
, varstr
);
2236 pstrcat(buf
, buf_size
, "(");
2238 while (sa
!= NULL
) {
2239 type_to_str(buf1
, sizeof(buf1
), &sa
->type
, NULL
);
2240 pstrcat(buf
, buf_size
, buf1
);
2243 pstrcat(buf
, buf_size
, ", ");
2245 pstrcat(buf
, buf_size
, ")");
2249 pstrcpy(buf1
, sizeof(buf1
), "*");
2251 pstrcat(buf1
, sizeof(buf1
), varstr
);
2252 type_to_str(buf
, buf_size
, &s
->type
, buf1
);
2256 pstrcat(buf
, buf_size
, " ");
2257 pstrcat(buf
, buf_size
, varstr
);
2262 /* verify type compatibility to store vtop in 'dt' type, and generate
2264 static void gen_assign_cast(CType
*dt
)
2266 CType
*st
, *type1
, *type2
, tmp_type1
, tmp_type2
;
2267 char buf1
[256], buf2
[256];
2270 st
= &vtop
->type
; /* source type */
2271 dbt
= dt
->t
& VT_BTYPE
;
2272 sbt
= st
->t
& VT_BTYPE
;
2274 tcc_error("Cannot assign void value");
2275 if (dt
->t
& VT_CONSTANT
)
2276 tcc_warning("assignment of read-only location");
2279 /* special cases for pointers */
2280 /* '0' can also be a pointer */
2281 if (is_null_pointer(vtop
))
2283 /* accept implicit pointer to integer cast with warning */
2284 if (is_integer_btype(sbt
)) {
2285 tcc_warning("assignment makes pointer from integer without a cast");
2288 type1
= pointed_type(dt
);
2289 /* a function is implicitely a function pointer */
2290 if (sbt
== VT_FUNC
) {
2291 if ((type1
->t
& VT_BTYPE
) != VT_VOID
&&
2292 !is_compatible_types(pointed_type(dt
), st
))
2293 tcc_warning("assignment from incompatible pointer type");
2298 type2
= pointed_type(st
);
2299 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
2300 (type2
->t
& VT_BTYPE
) == VT_VOID
) {
2301 /* void * can match anything */
2303 /* exact type match, except for unsigned */
2306 tmp_type1
.t
&= ~(VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
2307 tmp_type2
.t
&= ~(VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
2308 if (!is_compatible_types(&tmp_type1
, &tmp_type2
))
2309 tcc_warning("assignment from incompatible pointer type");
2311 /* check const and volatile */
2312 if ((!(type1
->t
& VT_CONSTANT
) && (type2
->t
& VT_CONSTANT
)) ||
2313 (!(type1
->t
& VT_VOLATILE
) && (type2
->t
& VT_VOLATILE
)))
2314 tcc_warning("assignment discards qualifiers from pointer target type");
2320 if (sbt
== VT_PTR
|| sbt
== VT_FUNC
) {
2321 tcc_warning("assignment makes integer from pointer without a cast");
2323 /* XXX: more tests */
2328 tmp_type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2329 tmp_type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2330 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
2332 type_to_str(buf1
, sizeof(buf1
), st
, NULL
);
2333 type_to_str(buf2
, sizeof(buf2
), dt
, NULL
);
2334 tcc_error("cannot cast '%s' to '%s'", buf1
, buf2
);
2342 /* store vtop in lvalue pushed on stack */
2343 ST_FUNC
void vstore(void)
2345 int sbt
, dbt
, ft
, r
, t
, size
, align
, bit_size
, bit_pos
, rc
, delayed_cast
;
2347 ft
= vtop
[-1].type
.t
;
2348 sbt
= vtop
->type
.t
& VT_BTYPE
;
2349 dbt
= ft
& VT_BTYPE
;
2350 if ((((sbt
== VT_INT
|| sbt
== VT_SHORT
) && dbt
== VT_BYTE
) ||
2351 (sbt
== VT_INT
&& dbt
== VT_SHORT
))
2352 && !(vtop
->type
.t
& VT_BITFIELD
)) {
2353 /* optimize char/short casts */
2354 delayed_cast
= VT_MUSTCAST
;
2355 vtop
->type
.t
= ft
& (VT_TYPE
& ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
)));
2356 /* XXX: factorize */
2357 if (ft
& VT_CONSTANT
)
2358 tcc_warning("assignment of read-only location");
2361 if (!(ft
& VT_BITFIELD
))
2362 gen_assign_cast(&vtop
[-1].type
);
2365 if (sbt
== VT_STRUCT
) {
2366 /* if structure, only generate pointer */
2367 /* structure assignment : generate memcpy */
2368 /* XXX: optimize if small size */
2369 if (!nocode_wanted
) {
2370 size
= type_size(&vtop
->type
, &align
);
2374 vtop
->type
.t
= VT_PTR
;
2377 /* address of memcpy() */
2380 vpush_global_sym(&func_old_type
, TOK_memcpy8
);
2381 else if(!(align
& 3))
2382 vpush_global_sym(&func_old_type
, TOK_memcpy4
);
2385 vpush_global_sym(&func_old_type
, TOK_memcpy
);
2390 vtop
->type
.t
= VT_PTR
;
2399 /* leave source on stack */
2400 } else if (ft
& VT_BITFIELD
) {
2401 /* bitfield store handling */
2402 bit_pos
= (ft
>> VT_STRUCT_SHIFT
) & 0x3f;
2403 bit_size
= (ft
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
2404 /* remove bit field info to avoid loops */
2405 vtop
[-1].type
.t
= ft
& ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
));
2407 /* duplicate source into other register */
2412 if((ft
& VT_BTYPE
) == VT_BOOL
) {
2413 gen_cast(&vtop
[-1].type
);
2414 vtop
[-1].type
.t
= (vtop
[-1].type
.t
& ~VT_BTYPE
) | (VT_BYTE
| VT_UNSIGNED
);
2417 /* duplicate destination */
2419 vtop
[-1] = vtop
[-2];
2421 /* mask and shift source */
2422 if((ft
& VT_BTYPE
) != VT_BOOL
) {
2423 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2424 vpushll((1ULL << bit_size
) - 1ULL);
2426 vpushi((1 << bit_size
) - 1);
2432 /* load destination, mask and or with source */
2434 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2435 vpushll(~(((1ULL << bit_size
) - 1ULL) << bit_pos
));
2437 vpushi(~(((1 << bit_size
) - 1) << bit_pos
));
2444 /* pop off shifted source from "duplicate source..." above */
2448 #ifdef CONFIG_TCC_BCHECK
2449 /* bound check case */
2450 if (vtop
[-1].r
& VT_MUSTBOUND
) {
2456 if (!nocode_wanted
) {
2460 #ifdef TCC_TARGET_X86_64
2461 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
2466 r
= gv(rc
); /* generate value */
2467 /* if lvalue was saved on stack, must read it */
2468 if ((vtop
[-1].r
& VT_VALMASK
) == VT_LLOCAL
) {
2470 t
= get_reg(RC_INT
);
2471 #ifdef TCC_TARGET_X86_64
2476 sv
.r
= VT_LOCAL
| VT_LVAL
;
2477 sv
.c
.ul
= vtop
[-1].c
.ul
;
2479 vtop
[-1].r
= t
| VT_LVAL
;
2482 #ifndef TCC_TARGET_X86_64
2483 /* two word case handling : store second register at word + 4 */
2484 if ((ft
& VT_BTYPE
) == VT_LLONG
) {
2486 /* convert to int to increment easily */
2487 vtop
->type
.t
= VT_INT
;
2493 /* XXX: it works because r2 is spilled last ! */
2494 store(vtop
->r2
, vtop
- 1);
2499 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
2500 vtop
->r
|= delayed_cast
;
2504 /* post defines POST/PRE add. c is the token ++ or -- */
2505 ST_FUNC
void inc(int post
, int c
)
2508 vdup(); /* save lvalue */
2510 gv_dup(); /* duplicate value */
2515 vpushi(c
- TOK_MID
);
2517 vstore(); /* store value */
2519 vpop(); /* if post op, return saved value */
2522 /* Parse GNUC __attribute__ extension. Currently, the following
2523 extensions are recognized:
2524 - aligned(n) : set data/function alignment.
2525 - packed : force data alignment to 1
2526 - section(x) : generate data/code in this section.
2527 - unused : currently ignored, but may be used someday.
2528 - regparm(n) : pass function parameters in registers (i386 only)
2530 static void parse_attribute(AttributeDef
*ad
)
2534 while (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
) {
2538 while (tok
!= ')') {
2539 if (tok
< TOK_IDENT
)
2540 expect("attribute name");
2548 expect("section name");
2549 ad
->section
= find_section(tcc_state
, (char *)tokc
.cstr
->data
);
2557 expect("alias(\"target\")");
2558 ad
->alias_target
= /* save string as token, for later */
2559 tok_alloc((char*)tokc
.cstr
->data
, tokc
.cstr
->size
-1)->tok
;
2568 if (n
<= 0 || (n
& (n
- 1)) != 0)
2569 tcc_error("alignment must be a positive power of two");
2586 /* currently, no need to handle it because tcc does not
2587 track unused objects */
2591 /* currently, no need to handle it because tcc does not
2592 track unused objects */
2597 ad
->func_call
= FUNC_CDECL
;
2602 ad
->func_call
= FUNC_STDCALL
;
2604 #ifdef TCC_TARGET_I386
2614 ad
->func_call
= FUNC_FASTCALL1
+ n
- 1;
2620 ad
->func_call
= FUNC_FASTCALLW
;
2627 ad
->mode
= VT_LLONG
+ 1;
2630 ad
->mode
= VT_SHORT
+ 1;
2633 ad
->mode
= VT_INT
+ 1;
2636 tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok
, NULL
));
2643 ad
->func_export
= 1;
2646 ad
->func_import
= 1;
2649 if (tcc_state
->warn_unsupported
)
2650 tcc_warning("'%s' attribute ignored", get_tok_str(t
, NULL
));
2651 /* skip parameters */
2653 int parenthesis
= 0;
2657 else if (tok
== ')')
2660 } while (parenthesis
&& tok
!= -1);
2673 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
2674 static void struct_decl(CType
*type
, int u
)
2676 int a
, v
, size
, align
, maxalign
, c
, offset
;
2677 int bit_size
, bit_pos
, bsize
, bt
, lbit_pos
, prevbt
;
2678 Sym
*s
, *ss
, *ass
, **ps
;
2682 a
= tok
; /* save decl type */
2687 /* struct already defined ? return it */
2689 expect("struct/union/enum name");
2693 tcc_error("invalid type");
2700 /* we put an undefined size for struct/union */
2701 s
= sym_push(v
| SYM_STRUCT
, &type1
, 0, -1);
2702 s
->r
= 0; /* default alignment is zero as gcc */
2703 /* put struct/union/enum name in type */
2711 tcc_error("struct/union/enum already defined");
2712 /* cannot be empty */
2714 /* non empty enums are not allowed */
2715 if (a
== TOK_ENUM
) {
2719 expect("identifier");
2725 /* enum symbols have static storage */
2726 ss
= sym_push(v
, &int_type
, VT_CONST
, c
);
2727 ss
->type
.t
|= VT_STATIC
;
2732 /* NOTE: we accept a trailing comma */
2743 while (tok
!= '}') {
2744 parse_btype(&btype
, &ad
);
2750 type_decl(&type1
, &ad
, &v
, TYPE_DIRECT
| TYPE_ABSTRACT
);
2751 if (v
== 0 && (type1
.t
& VT_BTYPE
) != VT_STRUCT
)
2752 expect("identifier");
2753 if ((type1
.t
& VT_BTYPE
) == VT_FUNC
||
2754 (type1
.t
& (VT_TYPEDEF
| VT_STATIC
| VT_EXTERN
| VT_INLINE
)))
2755 tcc_error("invalid type for '%s'",
2756 get_tok_str(v
, NULL
));
2760 bit_size
= expr_const();
2761 /* XXX: handle v = 0 case for messages */
2763 tcc_error("negative width in bit-field '%s'",
2764 get_tok_str(v
, NULL
));
2765 if (v
&& bit_size
== 0)
2766 tcc_error("zero width for bit-field '%s'",
2767 get_tok_str(v
, NULL
));
2769 size
= type_size(&type1
, &align
);
2771 if (align
< ad
.aligned
)
2773 } else if (ad
.packed
) {
2775 } else if (*tcc_state
->pack_stack_ptr
) {
2776 if (align
> *tcc_state
->pack_stack_ptr
)
2777 align
= *tcc_state
->pack_stack_ptr
;
2780 if (bit_size
>= 0) {
2781 bt
= type1
.t
& VT_BTYPE
;
2788 tcc_error("bitfields must have scalar type");
2790 if (bit_size
> bsize
) {
2791 tcc_error("width of '%s' exceeds its type",
2792 get_tok_str(v
, NULL
));
2793 } else if (bit_size
== bsize
) {
2794 /* no need for bit fields */
2796 } else if (bit_size
== 0) {
2797 /* XXX: what to do if only padding in a
2799 /* zero size: means to pad */
2802 /* we do not have enough room ?
2803 did the type change?
2805 if ((bit_pos
+ bit_size
) > bsize
||
2806 bt
!= prevbt
|| a
== TOK_UNION
)
2809 /* XXX: handle LSB first */
2810 type1
.t
|= VT_BITFIELD
|
2811 (bit_pos
<< VT_STRUCT_SHIFT
) |
2812 (bit_size
<< (VT_STRUCT_SHIFT
+ 6));
2813 bit_pos
+= bit_size
;
2819 if (v
!= 0 || (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
2820 /* add new memory data only if starting
2822 if (lbit_pos
== 0) {
2823 if (a
== TOK_STRUCT
) {
2824 c
= (c
+ align
- 1) & -align
;
2833 if (align
> maxalign
)
2837 printf("add field %s offset=%d",
2838 get_tok_str(v
, NULL
), offset
);
2839 if (type1
.t
& VT_BITFIELD
) {
2840 printf(" pos=%d size=%d",
2841 (type1
.t
>> VT_STRUCT_SHIFT
) & 0x3f,
2842 (type1
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f);
2847 if (v
== 0 && (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
2849 while ((ass
= ass
->next
) != NULL
) {
2850 ss
= sym_push(ass
->v
, &ass
->type
, 0, offset
+ ass
->c
);
2855 ss
= sym_push(v
| SYM_FIELD
, &type1
, 0, offset
);
2859 if (tok
== ';' || tok
== TOK_EOF
)
2866 /* store size and alignment */
2867 s
->c
= (c
+ maxalign
- 1) & -maxalign
;
2873 /* return 0 if no type declaration. otherwise, return the basic type
2876 static int parse_btype(CType
*type
, AttributeDef
*ad
)
2878 int t
, u
, type_found
, typespec_found
, typedef_found
;
2882 memset(ad
, 0, sizeof(AttributeDef
));
2890 /* currently, we really ignore extension */
2900 if ((t
& VT_BTYPE
) != 0)
2901 tcc_error("too many basic types");
2917 if ((t
& VT_BTYPE
) == VT_DOUBLE
) {
2918 #ifndef TCC_TARGET_PE
2919 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
2921 } else if ((t
& VT_BTYPE
) == VT_LONG
) {
2922 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
2936 if ((t
& VT_BTYPE
) == VT_LONG
) {
2937 #ifdef TCC_TARGET_PE
2938 t
= (t
& ~VT_BTYPE
) | VT_DOUBLE
;
2940 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
2948 struct_decl(&type1
, VT_ENUM
);
2951 type
->ref
= type1
.ref
;
2955 struct_decl(&type1
, VT_STRUCT
);
2958 /* type modifiers */
3011 /* GNUC attribute */
3012 case TOK_ATTRIBUTE1
:
3013 case TOK_ATTRIBUTE2
:
3014 parse_attribute(ad
);
3017 t
= (t
& ~VT_BTYPE
) | u
;
3025 parse_expr_type(&type1
);
3026 /* remove all storage modifiers except typedef */
3027 type1
.t
&= ~(VT_STORAGE
&~VT_TYPEDEF
);
3030 if (typespec_found
|| typedef_found
)
3033 if (!s
|| !(s
->type
.t
& VT_TYPEDEF
))
3036 t
|= (s
->type
.t
& ~VT_TYPEDEF
);
3037 type
->ref
= s
->type
.ref
;
3039 /* get attributes from typedef */
3040 if (0 == ad
->aligned
)
3041 ad
->aligned
= FUNC_ALIGN(s
->r
);
3042 if (0 == ad
->func_call
)
3043 ad
->func_call
= FUNC_CALL(s
->r
);
3044 ad
->packed
|= FUNC_PACKED(s
->r
);
3053 if ((t
& (VT_SIGNED
|VT_UNSIGNED
)) == (VT_SIGNED
|VT_UNSIGNED
))
3054 tcc_error("signed and unsigned modifier");
3055 if (tcc_state
->char_is_unsigned
) {
3056 if ((t
& (VT_SIGNED
|VT_UNSIGNED
|VT_BTYPE
)) == VT_BYTE
)
3061 /* long is never used as type */
3062 if ((t
& VT_BTYPE
) == VT_LONG
)
3063 #if !defined TCC_TARGET_X86_64 || defined TCC_TARGET_PE
3064 t
= (t
& ~VT_BTYPE
) | VT_INT
;
3066 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3072 /* convert a function parameter type (array to pointer and function to
3073 function pointer) */
3074 static inline void convert_parameter_type(CType
*pt
)
3076 /* remove const and volatile qualifiers (XXX: const could be used
3077 to indicate a const function parameter */
3078 pt
->t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3079 /* array must be transformed to pointer according to ANSI C */
3081 if ((pt
->t
& VT_BTYPE
) == VT_FUNC
) {
3086 ST_FUNC
void parse_asm_str(CString
*astr
)
3089 /* read the string */
3091 expect("string constant");
3093 while (tok
== TOK_STR
) {
3094 /* XXX: add \0 handling too ? */
3095 cstr_cat(astr
, tokc
.cstr
->data
);
3098 cstr_ccat(astr
, '\0');
3101 /* Parse an asm label and return the label
3102 * Don't forget to free the CString in the caller! */
3103 static void asm_label_instr(CString
*astr
)
3106 parse_asm_str(astr
);
3109 printf("asm_alias: \"%s\"\n", (char *)astr
->data
);
3113 static void post_type(CType
*type
, AttributeDef
*ad
)
3115 int n
, l
, t1
, arg_size
, align
;
3116 Sym
**plast
, *s
, *first
;
3121 /* function declaration */
3129 /* read param name and compute offset */
3130 if (l
!= FUNC_OLD
) {
3131 if (!parse_btype(&pt
, &ad1
)) {
3133 tcc_error("invalid type");
3140 if ((pt
.t
& VT_BTYPE
) == VT_VOID
&& tok
== ')')
3142 type_decl(&pt
, &ad1
, &n
, TYPE_DIRECT
| TYPE_ABSTRACT
);
3143 if ((pt
.t
& VT_BTYPE
) == VT_VOID
)
3144 tcc_error("parameter declared as void");
3145 arg_size
+= (type_size(&pt
, &align
) + PTR_SIZE
- 1) / PTR_SIZE
;
3150 expect("identifier");
3154 convert_parameter_type(&pt
);
3155 s
= sym_push(n
| SYM_FIELD
, &pt
, 0, 0);
3161 if (l
== FUNC_NEW
&& tok
== TOK_DOTS
) {
3168 /* if no parameters, then old type prototype */
3172 /* NOTE: const is ignored in returned type as it has a special
3173 meaning in gcc / C++ */
3174 type
->t
&= ~VT_CONSTANT
;
3175 /* some ancient pre-K&R C allows a function to return an array
3176 and the array brackets to be put after the arguments, such
3177 that "int c()[]" means something like "int[] c()" */
3180 skip(']'); /* only handle simple "[]" */
3183 /* we push a anonymous symbol which will contain the function prototype */
3184 ad
->func_args
= arg_size
;
3185 s
= sym_push(SYM_FIELD
, type
, INT_ATTR(ad
), l
);
3189 } else if (tok
== '[') {
3190 /* array definition */
3192 if (tok
== TOK_RESTRICT1
)
3197 if (!local_stack
|| nocode_wanted
)
3198 vpushi(expr_const());
3200 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3203 tcc_error("invalid array size");
3205 if (!is_integer_btype(vtop
->type
.t
& VT_BTYPE
))
3206 tcc_error("size of variable length array should be an integer");
3211 /* parse next post type */
3212 post_type(type
, ad
);
3213 t1
|= type
->t
& VT_VLA
;
3216 loc
-= type_size(&int_type
, &align
);
3220 vla_runtime_type_size(type
, &align
);
3222 vset(&int_type
, VT_LOCAL
|VT_LVAL
, loc
);
3229 /* we push an anonymous symbol which will contain the array
3231 s
= sym_push(SYM_FIELD
, type
, 0, n
);
3232 type
->t
= (t1
? VT_VLA
: VT_ARRAY
) | VT_PTR
;
3237 /* Parse a type declaration (except basic type), and return the type
3238 in 'type'. 'td' is a bitmask indicating which kind of type decl is
3239 expected. 'type' should contain the basic type. 'ad' is the
3240 attribute definition of the basic type. It can be modified by
3243 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
)
3246 CType type1
, *type2
;
3247 int qualifiers
, storage
;
3249 while (tok
== '*') {
3257 qualifiers
|= VT_CONSTANT
;
3262 qualifiers
|= VT_VOLATILE
;
3270 type
->t
|= qualifiers
;
3273 /* XXX: clarify attribute handling */
3274 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3275 parse_attribute(ad
);
3277 /* recursive type */
3278 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
3279 type1
.t
= 0; /* XXX: same as int */
3282 /* XXX: this is not correct to modify 'ad' at this point, but
3283 the syntax is not clear */
3284 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3285 parse_attribute(ad
);
3286 type_decl(&type1
, ad
, v
, td
);
3289 /* type identifier */
3290 if (tok
>= TOK_IDENT
&& (td
& TYPE_DIRECT
)) {
3294 if (!(td
& TYPE_ABSTRACT
))
3295 expect("identifier");
3299 storage
= type
->t
& VT_STORAGE
;
3300 type
->t
&= ~VT_STORAGE
;
3301 post_type(type
, ad
);
3303 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3304 parse_attribute(ad
);
3308 /* append type at the end of type1 */
3321 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
3322 ST_FUNC
int lvalue_type(int t
)
3327 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
3329 else if (bt
== VT_SHORT
)
3333 if (t
& VT_UNSIGNED
)
3334 r
|= VT_LVAL_UNSIGNED
;
3338 /* indirection with full error checking and bound check */
3339 ST_FUNC
void indir(void)
3341 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
) {
3342 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FUNC
)
3346 if ((vtop
->r
& VT_LVAL
) && !nocode_wanted
)
3348 vtop
->type
= *pointed_type(&vtop
->type
);
3349 /* Arrays and functions are never lvalues */
3350 if (!(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_VLA
)
3351 && (vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
3352 vtop
->r
|= lvalue_type(vtop
->type
.t
);
3353 /* if bound checking, the referenced pointer must be checked */
3354 #ifdef CONFIG_TCC_BCHECK
3355 if (tcc_state
->do_bounds_check
)
3356 vtop
->r
|= VT_MUSTBOUND
;
3361 /* pass a parameter to a function and do type checking and casting */
3362 static void gfunc_param_typed(Sym
*func
, Sym
*arg
)
3367 func_type
= func
->c
;
3368 if (func_type
== FUNC_OLD
||
3369 (func_type
== FUNC_ELLIPSIS
&& arg
== NULL
)) {
3370 /* default casting : only need to convert float to double */
3371 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
) {
3375 } else if (arg
== NULL
) {
3376 tcc_error("too many arguments to function");
3379 type
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
3380 gen_assign_cast(&type
);
3384 /* parse an expression of the form '(type)' or '(expr)' and return its
3386 static void parse_expr_type(CType
*type
)
3392 if (parse_btype(type
, &ad
)) {
3393 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3400 static void parse_type(CType
*type
)
3405 if (!parse_btype(type
, &ad
)) {
3408 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3411 static void vpush_tokc(int t
)
3416 vsetc(&type
, VT_CONST
, &tokc
);
3419 ST_FUNC
void unary(void)
3421 int n
, t
, align
, size
, r
, sizeof_caller
;
3425 static int in_sizeof
= 0;
3427 sizeof_caller
= in_sizeof
;
3429 /* XXX: GCC 2.95.3 does not generate a table although it should be
3443 vpush_tokc(VT_INT
| VT_UNSIGNED
);
3447 vpush_tokc(VT_LLONG
);
3451 vpush_tokc(VT_LLONG
| VT_UNSIGNED
);
3455 vpush_tokc(VT_FLOAT
);
3459 vpush_tokc(VT_DOUBLE
);
3463 vpush_tokc(VT_LDOUBLE
);
3466 case TOK___FUNCTION__
:
3468 goto tok_identifier
;
3474 /* special function name identifier */
3475 len
= strlen(funcname
) + 1;
3476 /* generate char[len] type */
3481 vpush_ref(&type
, data_section
, data_section
->data_offset
, len
);
3482 ptr
= section_ptr_add(data_section
, len
);
3483 memcpy(ptr
, funcname
, len
);
3488 #ifdef TCC_TARGET_PE
3489 t
= VT_SHORT
| VT_UNSIGNED
;
3495 /* string parsing */
3498 if (tcc_state
->warn_write_strings
)
3503 memset(&ad
, 0, sizeof(AttributeDef
));
3504 decl_initializer_alloc(&type
, &ad
, VT_CONST
, 2, 0, NULL
, 0);
3509 if (parse_btype(&type
, &ad
)) {
3510 type_decl(&type
, &ad
, &n
, TYPE_ABSTRACT
);
3512 /* check ISOC99 compound literal */
3514 /* data is allocated locally by default */
3519 /* all except arrays are lvalues */
3520 if (!(type
.t
& VT_ARRAY
))
3521 r
|= lvalue_type(type
.t
);
3522 memset(&ad
, 0, sizeof(AttributeDef
));
3523 decl_initializer_alloc(&type
, &ad
, r
, 1, 0, NULL
, 0);
3525 if (sizeof_caller
) {
3532 } else if (tok
== '{') {
3533 /* save all registers */
3535 /* statement expression : we do not accept break/continue
3536 inside as GCC does */
3537 block(NULL
, NULL
, NULL
, NULL
, 0, 1);
3552 /* functions names must be treated as function pointers,
3553 except for unary '&' and sizeof. Since we consider that
3554 functions are not lvalues, we only have to handle it
3555 there and in function calls. */
3556 /* arrays can also be used although they are not lvalues */
3557 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
&&
3558 !(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_LLOCAL
))
3560 mk_pointer(&vtop
->type
);
3566 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3568 boolean
.t
= VT_BOOL
;
3570 vtop
->c
.i
= !vtop
->c
.i
;
3571 } else if ((vtop
->r
& VT_VALMASK
) == VT_CMP
)
3572 vtop
->c
.i
= vtop
->c
.i
^ 1;
3575 vseti(VT_JMP
, gtst(1, 0));
3586 /* in order to force cast, we add zero */
3588 if ((vtop
->type
.t
& VT_BTYPE
) == VT_PTR
)
3589 tcc_error("pointer not accepted for unary plus");
3599 unary_type(&type
); // Perform a in_sizeof = 0;
3600 size
= type_size(&type
, &align
);
3601 if (t
== TOK_SIZEOF
) {
3602 if (!(type
.t
& VT_VLA
)) {
3604 tcc_error("sizeof applied to an incomplete type");
3607 vla_runtime_type_size(&type
, &align
);
3612 vtop
->type
.t
|= VT_UNSIGNED
;
3615 case TOK_builtin_types_compatible_p
:
3624 type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3625 type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3626 vpushi(is_compatible_types(&type1
, &type2
));
3629 case TOK_builtin_constant_p
:
3631 int saved_nocode_wanted
, res
;
3634 saved_nocode_wanted
= nocode_wanted
;
3637 res
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
3639 nocode_wanted
= saved_nocode_wanted
;
3644 case TOK_builtin_frame_address
:
3649 if (tok
!= TOK_CINT
) {
3650 tcc_error("__builtin_frame_address only takes integers");
3653 tcc_error("TCC only supports __builtin_frame_address(0)");
3659 vset(&type
, VT_LOCAL
, 0);
3662 #ifdef TCC_TARGET_X86_64
3663 case TOK_builtin_va_arg_types
:
3665 /* This definition must be synced with stdarg.h */
3666 enum __va_arg_type
{
3667 __va_gen_reg
, __va_float_reg
, __va_stack
3675 bt
= type
.t
& VT_BTYPE
;
3676 if (bt
== VT_STRUCT
|| bt
== VT_LDOUBLE
) {
3678 } else if (bt
== VT_FLOAT
|| bt
== VT_DOUBLE
) {
3679 vpushi(__va_float_reg
);
3681 vpushi(__va_gen_reg
);
3701 goto tok_identifier
;
3703 /* allow to take the address of a label */
3704 if (tok
< TOK_UIDENT
)
3705 expect("label identifier");
3706 s
= label_find(tok
);
3708 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
3710 if (s
->r
== LABEL_DECLARED
)
3711 s
->r
= LABEL_FORWARD
;
3714 s
->type
.t
= VT_VOID
;
3715 mk_pointer(&s
->type
);
3716 s
->type
.t
|= VT_STATIC
;
3718 vset(&s
->type
, VT_CONST
| VT_SYM
, 0);
3723 // special qnan , snan and infinity values
3725 vpush64(VT_DOUBLE
, 0x7ff8000000000000ULL
);
3729 vpush64(VT_DOUBLE
, 0x7ff0000000000001ULL
);
3733 vpush64(VT_DOUBLE
, 0x7ff0000000000000ULL
);
3742 expect("identifier");
3746 tcc_error("'%s' undeclared", get_tok_str(t
, NULL
));
3747 /* for simple function calls, we tolerate undeclared
3748 external reference to int() function */
3749 if (tcc_state
->warn_implicit_function_declaration
)
3750 tcc_warning("implicit declaration of function '%s'",
3751 get_tok_str(t
, NULL
));
3752 s
= external_global_sym(t
, &func_old_type
, 0);
3754 if ((s
->type
.t
& (VT_STATIC
| VT_INLINE
| VT_BTYPE
)) ==
3755 (VT_STATIC
| VT_INLINE
| VT_FUNC
)) {
3756 /* if referencing an inline function, then we generate a
3757 symbol to it if not already done. It will have the
3758 effect to generate code for it at the end of the
3759 compilation unit. Inline function as always
3760 generated in the text section. */
3762 put_extern_sym(s
, text_section
, 0, 0);
3763 r
= VT_SYM
| VT_CONST
;
3767 vset(&s
->type
, r
, s
->c
);
3768 /* if forward reference, we must point to s */
3769 if (vtop
->r
& VT_SYM
) {
3776 /* post operations */
3778 if (tok
== TOK_INC
|| tok
== TOK_DEC
) {
3781 } else if (tok
== '.' || tok
== TOK_ARROW
) {
3784 if (tok
== TOK_ARROW
)
3786 qualifiers
= vtop
->type
.t
& (VT_CONSTANT
| VT_VOLATILE
);
3790 /* expect pointer on structure */
3791 if ((vtop
->type
.t
& VT_BTYPE
) != VT_STRUCT
)
3792 expect("struct or union");
3796 while ((s
= s
->next
) != NULL
) {
3801 tcc_error("field not found: %s", get_tok_str(tok
& ~SYM_FIELD
, NULL
));
3802 /* add field offset to pointer */
3803 vtop
->type
= char_pointer_type
; /* change type to 'char *' */
3806 /* change type to field type, and set to lvalue */
3807 vtop
->type
= s
->type
;
3808 vtop
->type
.t
|= qualifiers
;
3809 /* an array is never an lvalue */
3810 if (!(vtop
->type
.t
& VT_ARRAY
)) {
3811 vtop
->r
|= lvalue_type(vtop
->type
.t
);
3812 #ifdef CONFIG_TCC_BCHECK
3813 /* if bound checking, the referenced pointer must be checked */
3814 if (tcc_state
->do_bounds_check
)
3815 vtop
->r
|= VT_MUSTBOUND
;
3819 } else if (tok
== '[') {
3825 } else if (tok
== '(') {
3831 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
3832 /* pointer test (no array accepted) */
3833 if ((vtop
->type
.t
& (VT_BTYPE
| VT_ARRAY
)) == VT_PTR
) {
3834 vtop
->type
= *pointed_type(&vtop
->type
);
3835 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
)
3839 expect("function pointer");
3842 vtop
->r
&= ~VT_LVAL
; /* no lvalue */
3844 /* get return type */
3847 sa
= s
->next
; /* first parameter */
3850 /* compute first implicit argument if a structure is returned */
3851 if ((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
3852 /* get some space for the returned structure */
3853 size
= type_size(&s
->type
, &align
);
3854 loc
= (loc
- size
) & -align
;
3856 ret
.r
= VT_LOCAL
| VT_LVAL
;
3857 /* pass it as 'int' to avoid structure arg passing
3859 vseti(VT_LOCAL
, loc
);
3864 /* return in register */
3865 if (is_float(ret
.type
.t
)) {
3866 ret
.r
= reg_fret(ret
.type
.t
);
3868 if ((ret
.type
.t
& VT_BTYPE
) == VT_LLONG
)
3877 gfunc_param_typed(s
, sa
);
3887 tcc_error("too few arguments to function");
3889 if (!nocode_wanted
) {
3890 gfunc_call(nb_args
);
3892 vtop
-= (nb_args
+ 1);
3895 vsetc(&ret
.type
, ret
.r
, &ret
.c
);
3903 ST_FUNC
void expr_prod(void)
3908 while (tok
== '*' || tok
== '/' || tok
== '%') {
3916 ST_FUNC
void expr_sum(void)
3921 while (tok
== '+' || tok
== '-') {
3929 static void expr_shift(void)
3934 while (tok
== TOK_SHL
|| tok
== TOK_SAR
) {
3942 static void expr_cmp(void)
3947 while ((tok
>= TOK_ULE
&& tok
<= TOK_GT
) ||
3948 tok
== TOK_ULT
|| tok
== TOK_UGE
) {
3956 static void expr_cmpeq(void)
3961 while (tok
== TOK_EQ
|| tok
== TOK_NE
) {
3969 static void expr_and(void)
3972 while (tok
== '&') {
3979 static void expr_xor(void)
3982 while (tok
== '^') {
3989 static void expr_or(void)
3992 while (tok
== '|') {
3999 /* XXX: fix this mess */
4000 static void expr_land_const(void)
4003 while (tok
== TOK_LAND
) {
4010 /* XXX: fix this mess */
4011 static void expr_lor_const(void)
4014 while (tok
== TOK_LOR
) {
4021 /* only used if non constant */
4022 static void expr_land(void)
4027 if (tok
== TOK_LAND
) {
4032 if (tok
!= TOK_LAND
) {
4042 static void expr_lor(void)
4047 if (tok
== TOK_LOR
) {
4052 if (tok
!= TOK_LOR
) {
4062 /* XXX: better constant handling */
4063 static void expr_cond(void)
4065 int tt
, u
, r1
, r2
, rc
, t1
, t2
, bt1
, bt2
;
4067 CType type
, type1
, type2
;
4074 boolean
.t
= VT_BOOL
;
4080 if (tok
!= ':' || !gnu_ext
) {
4095 if (vtop
!= vstack
) {
4096 /* needed to avoid having different registers saved in
4098 if (is_float(vtop
->type
.t
)) {
4100 #ifdef TCC_TARGET_X86_64
4101 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4111 if (tok
== ':' && gnu_ext
) {
4119 sv
= *vtop
; /* save value to handle it later */
4120 vtop
--; /* no vpop so that FP stack is not flushed */
4128 bt1
= t1
& VT_BTYPE
;
4130 bt2
= t2
& VT_BTYPE
;
4131 /* cast operands to correct type according to ISOC rules */
4132 if (is_float(bt1
) || is_float(bt2
)) {
4133 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
4134 type
.t
= VT_LDOUBLE
;
4135 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
4140 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
4141 /* cast to biggest op */
4143 /* convert to unsigned if it does not fit in a long long */
4144 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
4145 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
4146 type
.t
|= VT_UNSIGNED
;
4147 } else if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
4148 /* If one is a null ptr constant the result type
4150 if (is_null_pointer (vtop
))
4152 else if (is_null_pointer (&sv
))
4154 /* XXX: test pointer compatibility, C99 has more elaborate
4158 } else if (bt1
== VT_FUNC
|| bt2
== VT_FUNC
) {
4159 /* XXX: test function pointer compatibility */
4160 type
= bt1
== VT_FUNC
? type1
: type2
;
4161 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
4162 /* XXX: test structure compatibility */
4163 type
= bt1
== VT_STRUCT
? type1
: type2
;
4164 } else if (bt1
== VT_VOID
|| bt2
== VT_VOID
) {
4165 /* NOTE: as an extension, we accept void on only one side */
4168 /* integer operations */
4170 /* convert to unsigned if it does not fit in an integer */
4171 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
4172 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
4173 type
.t
|= VT_UNSIGNED
;
4176 /* now we convert second operand */
4178 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4181 if (is_float(type
.t
)) {
4183 #ifdef TCC_TARGET_X86_64
4184 if ((type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4188 } else if ((type
.t
& VT_BTYPE
) == VT_LLONG
) {
4189 /* for long longs, we use fixed registers to avoid having
4190 to handle a complicated move */
4195 /* this is horrible, but we must also convert first
4199 /* put again first value and cast it */
4202 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4212 static void expr_eq(void)
4218 (tok
>= TOK_A_MOD
&& tok
<= TOK_A_DIV
) ||
4219 tok
== TOK_A_XOR
|| tok
== TOK_A_OR
||
4220 tok
== TOK_A_SHL
|| tok
== TOK_A_SAR
) {
4235 ST_FUNC
void gexpr(void)
4246 /* parse an expression and return its type without any side effect. */
4247 static void expr_type(CType
*type
)
4249 int saved_nocode_wanted
;
4251 saved_nocode_wanted
= nocode_wanted
;
4256 nocode_wanted
= saved_nocode_wanted
;
4259 /* parse a unary expression and return its type without any side
4261 static void unary_type(CType
*type
)
4273 /* parse a constant expression and return value in vtop. */
4274 static void expr_const1(void)
4283 /* parse an integer constant and return its value. */
4284 ST_FUNC
int expr_const(void)
4288 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
4289 expect("constant expression");
4295 /* return the label token if current token is a label, otherwise
4297 static int is_label(void)
4301 /* fast test first */
4302 if (tok
< TOK_UIDENT
)
4304 /* no need to save tokc because tok is an identifier */
4311 unget_tok(last_tok
);
4316 static void label_or_decl(int l
)
4320 /* fast test first */
4321 if (tok
>= TOK_UIDENT
)
4323 /* no need to save tokc because tok is an identifier */
4327 unget_tok(last_tok
);
4330 unget_tok(last_tok
);
4335 static void block(int *bsym
, int *csym
, int *case_sym
, int *def_sym
,
4336 int case_reg
, int is_expr
)
4341 /* generate line number info */
4342 if (tcc_state
->do_debug
&&
4343 (last_line_num
!= file
->line_num
|| last_ind
!= ind
)) {
4344 put_stabn(N_SLINE
, 0, file
->line_num
, ind
- func_ind
);
4346 last_line_num
= file
->line_num
;
4350 /* default return value is (void) */
4352 vtop
->type
.t
= VT_VOID
;
4355 if (tok
== TOK_IF
) {
4362 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4364 if (c
== TOK_ELSE
) {
4368 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4369 gsym(d
); /* patch else jmp */
4372 } else if (tok
== TOK_WHILE
) {
4380 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4384 } else if (tok
== '{') {
4388 /* record local declaration stack position */
4390 llabel
= local_label_stack
;
4391 /* handle local labels declarations */
4392 if (tok
== TOK_LABEL
) {
4395 if (tok
< TOK_UIDENT
)
4396 expect("label identifier");
4397 label_push(&local_label_stack
, tok
, LABEL_DECLARED
);
4407 while (tok
!= '}') {
4408 label_or_decl(VT_LOCAL
);
4412 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
4415 /* pop locally defined labels */
4416 label_pop(&local_label_stack
, llabel
);
4418 /* XXX: this solution makes only valgrind happy...
4419 triggered by gcc.c-torture/execute/20000917-1.c */
4421 switch(vtop
->type
.t
& VT_BTYPE
) {
4426 for(p
=vtop
->type
.ref
;p
;p
=p
->prev
)
4428 tcc_error("unsupported expression type");
4431 /* pop locally defined symbols */
4432 sym_pop(&local_stack
, s
);
4434 } else if (tok
== TOK_RETURN
) {
4438 gen_assign_cast(&func_vt
);
4439 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
4441 /* if returning structure, must copy it to implicit
4442 first pointer arg location */
4445 size
= type_size(&func_vt
,&align
);
4448 if((vtop
->r
!= (VT_LOCAL
| VT_LVAL
) || (vtop
->c
.i
& 3))
4452 loc
= (loc
- size
) & -4;
4455 vset(&type
, VT_LOCAL
| VT_LVAL
, addr
);
4458 vset(&int_type
, VT_LOCAL
| VT_LVAL
, addr
);
4460 vtop
->type
= int_type
;
4466 vset(&type
, VT_LOCAL
| VT_LVAL
, func_vc
);
4469 /* copy structure value to pointer */
4474 } else if (is_float(func_vt
.t
)) {
4475 gv(rc_fret(func_vt
.t
));
4479 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
4482 rsym
= gjmp(rsym
); /* jmp */
4483 } else if (tok
== TOK_BREAK
) {
4486 tcc_error("cannot break");
4487 *bsym
= gjmp(*bsym
);
4490 } else if (tok
== TOK_CONTINUE
) {
4493 tcc_error("cannot continue");
4494 *csym
= gjmp(*csym
);
4497 } else if (tok
== TOK_FOR
) {
4503 /* c99 for-loop init decl? */
4504 if (!decl0(VT_LOCAL
, 1)) {
4505 /* no, regular for-loop init expr */
4529 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4533 sym_pop(&local_stack
, s
);
4535 if (tok
== TOK_DO
) {
4540 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4551 if (tok
== TOK_SWITCH
) {
4555 /* XXX: other types than integer */
4556 case_reg
= gv(RC_INT
);
4560 b
= gjmp(0); /* jump to first case */
4562 block(&a
, csym
, &b
, &c
, case_reg
, 0);
4563 /* if no default, jmp after switch */
4571 if (tok
== TOK_CASE
) {
4578 if (gnu_ext
&& tok
== TOK_DOTS
) {
4582 tcc_warning("empty case range");
4584 /* since a case is like a label, we must skip it with a jmp */
4591 *case_sym
= gtst(1, 0);
4594 *case_sym
= gtst(1, 0);
4598 *case_sym
= gtst(1, *case_sym
);
4603 goto block_after_label
;
4605 if (tok
== TOK_DEFAULT
) {
4611 tcc_error("too many 'default'");
4614 goto block_after_label
;
4616 if (tok
== TOK_GOTO
) {
4618 if (tok
== '*' && gnu_ext
) {
4622 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
)
4625 } else if (tok
>= TOK_UIDENT
) {
4626 s
= label_find(tok
);
4627 /* put forward definition if needed */
4629 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
4631 if (s
->r
== LABEL_DECLARED
)
4632 s
->r
= LABEL_FORWARD
;
4634 /* label already defined */
4635 if (s
->r
& LABEL_FORWARD
)
4636 s
->jnext
= gjmp(s
->jnext
);
4638 gjmp_addr(s
->jnext
);
4641 expect("label identifier");
4644 } else if (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
) {
4652 if (s
->r
== LABEL_DEFINED
)
4653 tcc_error("duplicate label '%s'", get_tok_str(s
->v
, NULL
));
4655 s
->r
= LABEL_DEFINED
;
4657 s
= label_push(&global_label_stack
, b
, LABEL_DEFINED
);
4660 /* we accept this, but it is a mistake */
4663 tcc_warning("deprecated use of label at end of compound statement");
4667 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
4670 /* expression case */
4685 /* t is the array or struct type. c is the array or struct
4686 address. cur_index/cur_field is the pointer to the current
4687 value. 'size_only' is true if only size info is needed (only used
4689 static void decl_designator(CType
*type
, Section
*sec
, unsigned long c
,
4690 int *cur_index
, Sym
**cur_field
,
4694 int notfirst
, index
, index_last
, align
, l
, nb_elems
, elem_size
;
4700 if (gnu_ext
&& (l
= is_label()) != 0)
4702 while (tok
== '[' || tok
== '.') {
4704 if (!(type
->t
& VT_ARRAY
))
4705 expect("array type");
4708 index
= expr_const();
4709 if (index
< 0 || (s
->c
>= 0 && index
>= s
->c
))
4710 expect("invalid index");
4711 if (tok
== TOK_DOTS
&& gnu_ext
) {
4713 index_last
= expr_const();
4714 if (index_last
< 0 ||
4715 (s
->c
>= 0 && index_last
>= s
->c
) ||
4717 expect("invalid index");
4723 *cur_index
= index_last
;
4724 type
= pointed_type(type
);
4725 elem_size
= type_size(type
, &align
);
4726 c
+= index
* elem_size
;
4727 /* NOTE: we only support ranges for last designator */
4728 nb_elems
= index_last
- index
+ 1;
4729 if (nb_elems
!= 1) {
4738 if ((type
->t
& VT_BTYPE
) != VT_STRUCT
)
4739 expect("struct/union type");
4752 /* XXX: fix this mess by using explicit storage field */
4754 type1
.t
|= (type
->t
& ~VT_TYPE
);
4768 if (type
->t
& VT_ARRAY
) {
4770 type
= pointed_type(type
);
4771 c
+= index
* type_size(type
, &align
);
4775 tcc_error("too many field init");
4776 /* XXX: fix this mess by using explicit storage field */
4778 type1
.t
|= (type
->t
& ~VT_TYPE
);
4783 decl_initializer(type
, sec
, c
, 0, size_only
);
4785 /* XXX: make it more general */
4786 if (!size_only
&& nb_elems
> 1) {
4787 unsigned long c_end
;
4792 tcc_error("range init not supported yet for dynamic storage");
4793 c_end
= c
+ nb_elems
* elem_size
;
4794 if (c_end
> sec
->data_allocated
)
4795 section_realloc(sec
, c_end
);
4796 src
= sec
->data
+ c
;
4798 for(i
= 1; i
< nb_elems
; i
++) {
4800 memcpy(dst
, src
, elem_size
);
4806 #define EXPR_CONST 1
4809 /* store a value or an expression directly in global data or in local array */
4810 static void init_putv(CType
*type
, Section
*sec
, unsigned long c
,
4811 int v
, int expr_type
)
4813 int saved_global_expr
, bt
, bit_pos
, bit_size
;
4815 unsigned long long bit_mask
;
4823 /* compound literals must be allocated globally in this case */
4824 saved_global_expr
= global_expr
;
4827 global_expr
= saved_global_expr
;
4828 /* NOTE: symbols are accepted */
4829 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) != VT_CONST
)
4830 tcc_error("initializer element is not constant");
4838 dtype
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
4841 /* XXX: not portable */
4842 /* XXX: generate error if incorrect relocation */
4843 gen_assign_cast(&dtype
);
4844 bt
= type
->t
& VT_BTYPE
;
4845 /* we'll write at most 12 bytes */
4846 if (c
+ 12 > sec
->data_allocated
) {
4847 section_realloc(sec
, c
+ 12);
4849 ptr
= sec
->data
+ c
;
4850 /* XXX: make code faster ? */
4851 if (!(type
->t
& VT_BITFIELD
)) {
4856 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
4857 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
4858 bit_mask
= (1LL << bit_size
) - 1;
4860 if ((vtop
->r
& VT_SYM
) &&
4866 (bt
== VT_INT
&& bit_size
!= 32)))
4867 tcc_error("initializer element is not computable at load time");
4870 vtop
->c
.i
= (vtop
->c
.i
!= 0);
4872 *(char *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
4875 *(short *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
4878 *(double *)ptr
= vtop
->c
.d
;
4881 *(long double *)ptr
= vtop
->c
.ld
;
4884 *(long long *)ptr
|= (vtop
->c
.ll
& bit_mask
) << bit_pos
;
4887 if (vtop
->r
& VT_SYM
) {
4888 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
4890 *(int *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
4895 vset(&dtype
, VT_LOCAL
|VT_LVAL
, c
);
4902 /* put zeros for variable based init */
4903 static void init_putz(CType
*t
, Section
*sec
, unsigned long c
, int size
)
4906 /* nothing to do because globals are already set to zero */
4908 vpush_global_sym(&func_old_type
, TOK_memset
);
4916 /* 't' contains the type and storage info. 'c' is the offset of the
4917 object in section 'sec'. If 'sec' is NULL, it means stack based
4918 allocation. 'first' is true if array '{' must be read (multi
4919 dimension implicit array init handling). 'size_only' is true if
4920 size only evaluation is wanted (only for arrays). */
4921 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
,
4922 int first
, int size_only
)
4924 int index
, array_length
, n
, no_oblock
, nb
, parlevel
, parlevel1
, i
;
4925 int size1
, align1
, expr_type
;
4929 if (type
->t
& VT_VLA
) {
4930 #if defined TCC_TARGET_I386 || defined TCC_TARGET_X86_64
4934 vpush_global_sym(&func_old_type
, TOK_alloca
);
4935 vla_runtime_type_size(type
, &a
);
4940 vsetc(type
, REG_IRET
, &retcval
);
4941 vset(type
, VT_LOCAL
|VT_LVAL
, c
);
4946 tcc_error("variable length arrays unsupported for this target");
4948 } else if (type
->t
& VT_ARRAY
) {
4952 t1
= pointed_type(type
);
4953 size1
= type_size(t1
, &align1
);
4956 if ((first
&& tok
!= TOK_LSTR
&& tok
!= TOK_STR
) ||
4959 tcc_error("character array initializer must be a literal,"
4960 " optionally enclosed in braces");
4965 /* only parse strings here if correct type (otherwise: handle
4966 them as ((w)char *) expressions */
4967 if ((tok
== TOK_LSTR
&&
4968 #ifdef TCC_TARGET_PE
4969 (t1
->t
& VT_BTYPE
) == VT_SHORT
&& (t1
->t
& VT_UNSIGNED
)
4971 (t1
->t
& VT_BTYPE
) == VT_INT
4973 ) || (tok
== TOK_STR
&& (t1
->t
& VT_BTYPE
) == VT_BYTE
)) {
4974 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
4979 /* compute maximum number of chars wanted */
4981 cstr_len
= cstr
->size
;
4983 cstr_len
= cstr
->size
/ sizeof(nwchar_t
);
4986 if (n
>= 0 && nb
> (n
- array_length
))
4987 nb
= n
- array_length
;
4990 tcc_warning("initializer-string for array is too long");
4991 /* in order to go faster for common case (char
4992 string in global variable, we handle it
4994 if (sec
&& tok
== TOK_STR
&& size1
== 1) {
4995 memcpy(sec
->data
+ c
+ array_length
, cstr
->data
, nb
);
4999 ch
= ((unsigned char *)cstr
->data
)[i
];
5001 ch
= ((nwchar_t
*)cstr
->data
)[i
];
5002 init_putv(t1
, sec
, c
+ (array_length
+ i
) * size1
,
5010 /* only add trailing zero if enough storage (no
5011 warning in this case since it is standard) */
5012 if (n
< 0 || array_length
< n
) {
5014 init_putv(t1
, sec
, c
+ (array_length
* size1
), 0, EXPR_VAL
);
5020 while (tok
!= '}') {
5021 decl_designator(type
, sec
, c
, &index
, NULL
, size_only
);
5022 if (n
>= 0 && index
>= n
)
5023 tcc_error("index too large");
5024 /* must put zero in holes (note that doing it that way
5025 ensures that it even works with designators) */
5026 if (!size_only
&& array_length
< index
) {
5027 init_putz(t1
, sec
, c
+ array_length
* size1
,
5028 (index
- array_length
) * size1
);
5031 if (index
> array_length
)
5032 array_length
= index
;
5033 /* special test for multi dimensional arrays (may not
5034 be strictly correct if designators are used at the
5036 if (index
>= n
&& no_oblock
)
5045 /* put zeros at the end */
5046 if (!size_only
&& n
>= 0 && array_length
< n
) {
5047 init_putz(t1
, sec
, c
+ array_length
* size1
,
5048 (n
- array_length
) * size1
);
5050 /* patch type size if needed */
5052 s
->c
= array_length
;
5053 } else if ((type
->t
& VT_BTYPE
) == VT_STRUCT
&&
5054 (sec
|| !first
|| tok
== '{')) {
5057 /* NOTE: the previous test is a specific case for automatic
5058 struct/union init */
5059 /* XXX: union needs only one init */
5061 /* XXX: this test is incorrect for local initializers
5062 beginning with ( without {. It would be much more difficult
5063 to do it correctly (ideally, the expression parser should
5064 be used in all cases) */
5070 while (tok
== '(') {
5074 if (!parse_btype(&type1
, &ad1
))
5076 type_decl(&type1
, &ad1
, &n
, TYPE_ABSTRACT
);
5078 if (!is_assignable_types(type
, &type1
))
5079 tcc_error("invalid type for cast");
5084 if (first
|| tok
== '{') {
5093 while (tok
!= '}') {
5094 decl_designator(type
, sec
, c
, NULL
, &f
, size_only
);
5096 if (!size_only
&& array_length
< index
) {
5097 init_putz(type
, sec
, c
+ array_length
,
5098 index
- array_length
);
5100 index
= index
+ type_size(&f
->type
, &align1
);
5101 if (index
> array_length
)
5102 array_length
= index
;
5104 /* gr: skip fields from same union - ugly. */
5106 ///printf("index: %2d %08x -- %2d %08x\n", f->c, f->type.t, f->next->c, f->next->type.t);
5107 /* test for same offset */
5108 if (f
->next
->c
!= f
->c
)
5110 /* if yes, test for bitfield shift */
5111 if ((f
->type
.t
& VT_BITFIELD
) && (f
->next
->type
.t
& VT_BITFIELD
)) {
5112 int bit_pos_1
= (f
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5113 int bit_pos_2
= (f
->next
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5114 //printf("bitfield %d %d\n", bit_pos_1, bit_pos_2);
5115 if (bit_pos_1
!= bit_pos_2
)
5122 if (no_oblock
&& f
== NULL
)
5128 /* put zeros at the end */
5129 if (!size_only
&& array_length
< n
) {
5130 init_putz(type
, sec
, c
+ array_length
,
5139 } else if (tok
== '{') {
5141 decl_initializer(type
, sec
, c
, first
, size_only
);
5143 } else if (size_only
) {
5144 /* just skip expression */
5145 parlevel
= parlevel1
= 0;
5146 while ((parlevel
> 0 || parlevel1
> 0 ||
5147 (tok
!= '}' && tok
!= ',')) && tok
!= -1) {
5150 else if (tok
== ')')
5152 else if (tok
== '{')
5154 else if (tok
== '}')
5159 /* currently, we always use constant expression for globals
5160 (may change for scripting case) */
5161 expr_type
= EXPR_CONST
;
5163 expr_type
= EXPR_ANY
;
5164 init_putv(type
, sec
, c
, 0, expr_type
);
5168 /* parse an initializer for type 't' if 'has_init' is non zero, and
5169 allocate space in local or global data space ('r' is either
5170 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
5171 variable 'v' with an associated name represented by 'asm_label' of
5172 scope 'scope' is declared before initializers are parsed. If 'v' is
5173 zero, then a reference to the new object is put in the value stack.
5174 If 'has_init' is 2, a special parsing is done to handle string
5176 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
,
5177 int has_init
, int v
, char *asm_label
,
5180 int size
, align
, addr
, data_offset
;
5182 ParseState saved_parse_state
= {0};
5183 TokenString init_str
;
5185 Sym
*flexible_array
;
5187 flexible_array
= NULL
;
5188 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
5191 while (field
&& field
->next
)
5192 field
= field
->next
;
5193 if (field
->type
.t
& VT_ARRAY
&& field
->type
.ref
->c
< 0)
5194 flexible_array
= field
;
5197 size
= type_size(type
, &align
);
5198 /* If unknown size, we must evaluate it before
5199 evaluating initializers because
5200 initializers can generate global data too
5201 (e.g. string pointers or ISOC99 compound
5202 literals). It also simplifies local
5203 initializers handling */
5204 tok_str_new(&init_str
);
5205 if (size
< 0 || (flexible_array
&& has_init
)) {
5207 tcc_error("unknown type size");
5208 /* get all init string */
5209 if (has_init
== 2) {
5210 /* only get strings */
5211 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5212 tok_str_add_tok(&init_str
);
5217 while (level
> 0 || (tok
!= ',' && tok
!= ';')) {
5219 tcc_error("unexpected end of file in initializer");
5220 tok_str_add_tok(&init_str
);
5223 else if (tok
== '}') {
5233 tok_str_add(&init_str
, -1);
5234 tok_str_add(&init_str
, 0);
5237 save_parse_state(&saved_parse_state
);
5239 macro_ptr
= init_str
.str
;
5241 decl_initializer(type
, NULL
, 0, 1, 1);
5242 /* prepare second initializer parsing */
5243 macro_ptr
= init_str
.str
;
5246 /* if still unknown size, error */
5247 size
= type_size(type
, &align
);
5249 tcc_error("unknown type size");
5252 size
+= flexible_array
->type
.ref
->c
* pointed_size(&flexible_array
->type
);
5253 /* take into account specified alignment if bigger */
5255 if (ad
->aligned
> align
)
5256 align
= ad
->aligned
;
5257 } else if (ad
->packed
) {
5260 if ((r
& VT_VALMASK
) == VT_LOCAL
) {
5262 #ifdef CONFIG_TCC_BCHECK
5263 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5267 loc
= (loc
- size
) & -align
;
5269 #ifdef CONFIG_TCC_BCHECK
5270 /* handles bounds */
5271 /* XXX: currently, since we do only one pass, we cannot track
5272 '&' operators, so we add only arrays */
5273 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5274 unsigned long *bounds_ptr
;
5275 /* add padding between regions */
5277 /* then add local bound info */
5278 bounds_ptr
= section_ptr_add(lbounds_section
, 2 * sizeof(unsigned long));
5279 bounds_ptr
[0] = addr
;
5280 bounds_ptr
[1] = size
;
5284 /* local variable */
5285 sym_push(v
, type
, r
, addr
);
5287 /* push local reference */
5288 vset(type
, r
, addr
);
5294 if (v
&& scope
== VT_CONST
) {
5295 /* see if the symbol was already defined */
5298 if (!is_compatible_types(&sym
->type
, type
))
5299 tcc_error("incompatible types for redefinition of '%s'",
5300 get_tok_str(v
, NULL
));
5301 if (sym
->type
.t
& VT_EXTERN
) {
5302 /* if the variable is extern, it was not allocated */
5303 sym
->type
.t
&= ~VT_EXTERN
;
5304 /* set array size if it was ommited in extern
5306 if ((sym
->type
.t
& VT_ARRAY
) &&
5307 sym
->type
.ref
->c
< 0 &&
5309 sym
->type
.ref
->c
= type
->ref
->c
;
5311 /* we accept several definitions of the same
5312 global variable. this is tricky, because we
5313 must play with the SHN_COMMON type of the symbol */
5314 /* XXX: should check if the variable was already
5315 initialized. It is incorrect to initialized it
5317 /* no init data, we won't add more to the symbol */
5324 /* allocate symbol in corresponding section */
5329 else if (tcc_state
->nocommon
)
5333 data_offset
= sec
->data_offset
;
5334 data_offset
= (data_offset
+ align
- 1) & -align
;
5336 /* very important to increment global pointer at this time
5337 because initializers themselves can create new initializers */
5338 data_offset
+= size
;
5339 #ifdef CONFIG_TCC_BCHECK
5340 /* add padding if bound check */
5341 if (tcc_state
->do_bounds_check
)
5344 sec
->data_offset
= data_offset
;
5345 /* allocate section space to put the data */
5346 if (sec
->sh_type
!= SHT_NOBITS
&&
5347 data_offset
> sec
->data_allocated
)
5348 section_realloc(sec
, data_offset
);
5349 /* align section if needed */
5350 if (align
> sec
->sh_addralign
)
5351 sec
->sh_addralign
= align
;
5353 addr
= 0; /* avoid warning */
5357 if (scope
!= VT_CONST
|| !sym
) {
5358 sym
= sym_push(v
, type
, r
| VT_SYM
, 0);
5359 sym
->asm_label
= asm_label
;
5361 /* update symbol definition */
5363 put_extern_sym(sym
, sec
, addr
, size
);
5366 /* put a common area */
5367 put_extern_sym(sym
, NULL
, align
, size
);
5368 /* XXX: find a nicer way */
5369 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
5370 esym
->st_shndx
= SHN_COMMON
;
5375 /* push global reference */
5376 sym
= get_sym_ref(type
, sec
, addr
, size
);
5378 vsetc(type
, VT_CONST
| VT_SYM
, &cval
);
5381 /* patch symbol weakness */
5382 if (type
->t
& VT_WEAK
)
5384 #ifdef CONFIG_TCC_BCHECK
5385 /* handles bounds now because the symbol must be defined
5386 before for the relocation */
5387 if (tcc_state
->do_bounds_check
) {
5388 unsigned long *bounds_ptr
;
5390 greloc(bounds_section
, sym
, bounds_section
->data_offset
, R_DATA_PTR
);
5391 /* then add global bound info */
5392 bounds_ptr
= section_ptr_add(bounds_section
, 2 * sizeof(long));
5393 bounds_ptr
[0] = 0; /* relocated */
5394 bounds_ptr
[1] = size
;
5398 if (has_init
|| (type
->t
& VT_VLA
)) {
5399 decl_initializer(type
, sec
, addr
, 1, 0);
5400 /* restore parse state if needed */
5402 tok_str_free(init_str
.str
);
5403 restore_parse_state(&saved_parse_state
);
5405 /* patch flexible array member size back to -1, */
5406 /* for possible subsequent similar declarations */
5408 flexible_array
->type
.ref
->c
= -1;
5413 static void put_func_debug(Sym
*sym
)
5418 /* XXX: we put here a dummy type */
5419 snprintf(buf
, sizeof(buf
), "%s:%c1",
5420 funcname
, sym
->type
.t
& VT_STATIC
? 'f' : 'F');
5421 put_stabs_r(buf
, N_FUN
, 0, file
->line_num
, 0,
5422 cur_text_section
, sym
->c
);
5423 /* //gr gdb wants a line at the function */
5424 put_stabn(N_SLINE
, 0, file
->line_num
, 0);
5429 /* parse an old style function declaration list */
5430 /* XXX: check multiple parameter */
5431 static void func_decl_list(Sym
*func_sym
)
5438 /* parse each declaration */
5439 while (tok
!= '{' && tok
!= ';' && tok
!= ',' && tok
!= TOK_EOF
&&
5440 tok
!= TOK_ASM1
&& tok
!= TOK_ASM2
&& tok
!= TOK_ASM3
) {
5441 if (!parse_btype(&btype
, &ad
))
5442 expect("declaration list");
5443 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
5444 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
5446 /* we accept no variable after */
5450 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
5451 /* find parameter in function parameter list */
5454 if ((s
->v
& ~SYM_FIELD
) == v
)
5458 tcc_error("declaration for parameter '%s' but no such parameter",
5459 get_tok_str(v
, NULL
));
5461 /* check that no storage specifier except 'register' was given */
5462 if (type
.t
& VT_STORAGE
)
5463 tcc_error("storage class specified for '%s'", get_tok_str(v
, NULL
));
5464 convert_parameter_type(&type
);
5465 /* we can add the type (NOTE: it could be local to the function) */
5467 /* accept other parameters */
5478 /* parse a function defined by symbol 'sym' and generate its code in
5479 'cur_text_section' */
5480 static void gen_function(Sym
*sym
)
5482 int saved_nocode_wanted
= nocode_wanted
;
5484 ind
= cur_text_section
->data_offset
;
5485 /* NOTE: we patch the symbol size later */
5486 put_extern_sym(sym
, cur_text_section
, ind
, 0);
5487 funcname
= get_tok_str(sym
->v
, NULL
);
5489 /* put debug symbol */
5490 if (tcc_state
->do_debug
)
5491 put_func_debug(sym
);
5492 /* push a dummy symbol to enable local sym storage */
5493 sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
5494 gfunc_prolog(&sym
->type
);
5496 block(NULL
, NULL
, NULL
, NULL
, 0, 0);
5499 cur_text_section
->data_offset
= ind
;
5500 label_pop(&global_label_stack
, NULL
);
5501 sym_pop(&local_stack
, NULL
); /* reset local stack */
5502 /* end of function */
5503 /* patch symbol size */
5504 ((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
].st_size
=
5506 /* patch symbol weakness (this definition overrules any prototype) */
5507 if (sym
->type
.t
& VT_WEAK
)
5509 if (tcc_state
->do_debug
) {
5510 put_stabn(N_FUN
, 0, 0, ind
- func_ind
);
5512 /* It's better to crash than to generate wrong code */
5513 cur_text_section
= NULL
;
5514 funcname
= ""; /* for safety */
5515 func_vt
.t
= VT_VOID
; /* for safety */
5516 ind
= 0; /* for safety */
5517 nocode_wanted
= saved_nocode_wanted
;
5520 ST_FUNC
void gen_inline_functions(void)
5523 int *str
, inline_generated
, i
;
5524 struct InlineFunc
*fn
;
5526 /* iterate while inline function are referenced */
5528 inline_generated
= 0;
5529 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
5530 fn
= tcc_state
->inline_fns
[i
];
5532 if (sym
&& sym
->c
) {
5533 /* the function was used: generate its code and
5534 convert it to a normal function */
5535 str
= fn
->token_str
;
5538 strcpy(file
->filename
, fn
->filename
);
5539 sym
->r
= VT_SYM
| VT_CONST
;
5540 sym
->type
.t
&= ~VT_INLINE
;
5544 cur_text_section
= text_section
;
5546 macro_ptr
= NULL
; /* fail safe */
5548 inline_generated
= 1;
5551 if (!inline_generated
)
5554 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
5555 fn
= tcc_state
->inline_fns
[i
];
5556 str
= fn
->token_str
;
5559 dynarray_reset(&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
);
5562 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
5563 static int decl0(int l
, int is_for_loop_init
)
5571 if (!parse_btype(&btype
, &ad
)) {
5572 if (is_for_loop_init
)
5574 /* skip redundant ';' */
5575 /* XXX: find more elegant solution */
5580 if (l
== VT_CONST
&&
5581 (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
5582 /* global asm block */
5586 /* special test for old K&R protos without explicit int
5587 type. Only accepted when defining global data */
5588 if (l
== VT_LOCAL
|| tok
< TOK_DEFINE
)
5592 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
5593 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
5595 /* we accept no variable after */
5599 while (1) { /* iterate thru each declaration */
5600 char *asm_label
; // associated asm label
5602 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
5606 type_to_str(buf
, sizeof(buf
), t
, get_tok_str(v
, NULL
));
5607 printf("type = '%s'\n", buf
);
5610 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
5611 if ((type
.t
& VT_STATIC
) && (l
== VT_LOCAL
)) {
5612 tcc_error("function without file scope cannot be static");
5614 /* if old style function prototype, we accept a
5617 if (sym
->c
== FUNC_OLD
)
5618 func_decl_list(sym
);
5622 if (gnu_ext
&& (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
5625 asm_label_instr(&astr
);
5626 asm_label
= tcc_strdup(astr
.data
);
5629 /* parse one last attribute list, after asm label */
5630 parse_attribute(&ad
);
5635 #ifdef TCC_TARGET_PE
5637 type
.t
|= VT_IMPORT
;
5639 type
.t
|= VT_EXPORT
;
5643 tcc_error("cannot use local functions");
5644 if ((type
.t
& VT_BTYPE
) != VT_FUNC
)
5645 expect("function definition");
5647 /* reject abstract declarators in function definition */
5649 while ((sym
= sym
->next
) != NULL
)
5650 if (!(sym
->v
& ~SYM_FIELD
))
5651 expect("identifier");
5653 /* XXX: cannot do better now: convert extern line to static inline */
5654 if ((type
.t
& (VT_EXTERN
| VT_INLINE
)) == (VT_EXTERN
| VT_INLINE
))
5655 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
5659 if ((sym
->type
.t
& VT_BTYPE
) != VT_FUNC
)
5662 r
= sym
->type
.ref
->r
;
5663 /* use func_call from prototype if not defined */
5664 if (FUNC_CALL(r
) != FUNC_CDECL
5665 && FUNC_CALL(type
.ref
->r
) == FUNC_CDECL
)
5666 FUNC_CALL(type
.ref
->r
) = FUNC_CALL(r
);
5668 /* use export from prototype */
5670 FUNC_EXPORT(type
.ref
->r
) = 1;
5672 /* use static from prototype */
5673 if (sym
->type
.t
& VT_STATIC
)
5674 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
5676 if (!is_compatible_types(&sym
->type
, &type
)) {
5678 tcc_error("incompatible types for redefinition of '%s'",
5679 get_tok_str(v
, NULL
));
5681 /* if symbol is already defined, then put complete type */
5684 /* put function symbol */
5685 sym
= global_identifier_push(v
, type
.t
, 0);
5686 sym
->type
.ref
= type
.ref
;
5689 /* static inline functions are just recorded as a kind
5690 of macro. Their code will be emitted at the end of
5691 the compilation unit only if they are used */
5692 if ((type
.t
& (VT_INLINE
| VT_STATIC
)) ==
5693 (VT_INLINE
| VT_STATIC
)) {
5694 TokenString func_str
;
5696 struct InlineFunc
*fn
;
5697 const char *filename
;
5699 tok_str_new(&func_str
);
5705 tcc_error("unexpected end of file");
5706 tok_str_add_tok(&func_str
);
5711 } else if (t
== '}') {
5713 if (block_level
== 0)
5717 tok_str_add(&func_str
, -1);
5718 tok_str_add(&func_str
, 0);
5719 filename
= file
? file
->filename
: "";
5720 fn
= tcc_malloc(sizeof *fn
+ strlen(filename
));
5721 strcpy(fn
->filename
, filename
);
5723 fn
->token_str
= func_str
.str
;
5724 dynarray_add((void ***)&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
, fn
);
5727 /* compute text section */
5728 cur_text_section
= ad
.section
;
5729 if (!cur_text_section
)
5730 cur_text_section
= text_section
;
5731 sym
->r
= VT_SYM
| VT_CONST
;
5736 if (btype
.t
& VT_TYPEDEF
) {
5737 /* save typedefed type */
5738 /* XXX: test storage specifiers ? */
5739 sym
= sym_push(v
, &type
, INT_ATTR(&ad
), 0);
5740 sym
->type
.t
|= VT_TYPEDEF
;
5743 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
5744 /* external function definition */
5745 /* specific case for func_call attribute */
5746 type
.ref
->r
= INT_ATTR(&ad
);
5747 } else if (!(type
.t
& VT_ARRAY
)) {
5748 /* not lvalue if array */
5749 r
|= lvalue_type(type
.t
);
5751 has_init
= (tok
== '=');
5752 if (has_init
&& (type
.t
& VT_VLA
))
5753 tcc_error("Variable length array cannot be initialized");
5754 if ((btype
.t
& VT_EXTERN
) || ((type
.t
& VT_BTYPE
) == VT_FUNC
) ||
5755 ((type
.t
& VT_ARRAY
) && (type
.t
& VT_STATIC
) &&
5756 !has_init
&& l
== VT_CONST
&& type
.ref
->c
< 0)) {
5757 /* external variable or function */
5758 /* NOTE: as GCC, uninitialized global static
5759 arrays of null size are considered as
5761 sym
= external_sym(v
, &type
, r
, asm_label
);
5763 if (type
.t
& VT_WEAK
)
5766 if (ad
.alias_target
) {
5771 alias_target
= sym_find(ad
.alias_target
);
5772 if (!alias_target
|| !alias_target
->c
)
5773 tcc_error("unsupported forward __alias__ attribute");
5774 esym
= &((Elf32_Sym
*)symtab_section
->data
)[alias_target
->c
];
5775 tsec
.sh_num
= esym
->st_shndx
;
5776 put_extern_sym2(sym
, &tsec
, esym
->st_value
, esym
->st_size
, 0);
5779 type
.t
|= (btype
.t
& VT_STATIC
); /* Retain "static". */
5780 if (type
.t
& VT_STATIC
)
5786 decl_initializer_alloc(&type
, &ad
, r
, has_init
, v
, asm_label
, l
);
5790 if (is_for_loop_init
)
5803 ST_FUNC
void decl(int l
)