2 * TCC - Tiny C Compiler
4 * Copyright (c) 2001-2004 Fabrice Bellard
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 /********************************************************/
24 /* global variables */
26 /* loc : local variable index
27 ind : output code index
29 anon_sym: anonymous symbol index
31 ST_DATA
int rsym
, anon_sym
, ind
, loc
;
33 ST_DATA Section
*text_section
, *data_section
, *bss_section
; /* predefined sections */
34 ST_DATA Section
*cur_text_section
; /* current section where function code is generated */
36 ST_DATA Section
*last_text_section
; /* to handle .previous asm directive */
38 #ifdef CONFIG_TCC_BCHECK
39 /* bound check related sections */
40 ST_DATA Section
*bounds_section
; /* contains global data bound description */
41 ST_DATA Section
*lbounds_section
; /* contains local data bound description */
44 ST_DATA Section
*symtab_section
, *strtab_section
;
46 ST_DATA Section
*stab_section
, *stabstr_section
;
47 ST_DATA Sym
*sym_free_first
;
48 ST_DATA
void **sym_pools
;
49 ST_DATA
int nb_sym_pools
;
51 ST_DATA Sym
*global_stack
;
52 ST_DATA Sym
*local_stack
;
53 ST_DATA Sym
*define_stack
;
54 ST_DATA Sym
*global_label_stack
;
55 ST_DATA Sym
*local_label_stack
;
57 ST_DATA SValue vstack
[VSTACK_SIZE
], *vtop
;
59 ST_DATA
int const_wanted
; /* true if constant wanted */
60 ST_DATA
int nocode_wanted
; /* true if no code generation wanted for an expression */
61 ST_DATA
int global_expr
; /* true if compound literals must be allocated globally (used during initializers parsing */
62 ST_DATA CType func_vt
; /* current function return type (used by return instruction) */
64 ST_DATA
int last_line_num
, last_ind
, func_ind
; /* debug last line number and pc */
65 ST_DATA
char *funcname
;
67 ST_DATA CType char_pointer_type
, func_old_type
, int_type
;
69 /* ------------------------------------------------------------------------- */
70 static void gen_cast(CType
*type
);
71 static inline CType
*pointed_type(CType
*type
);
72 static int is_compatible_types(CType
*type1
, CType
*type2
);
73 static int parse_btype(CType
*type
, AttributeDef
*ad
);
74 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
);
75 static void parse_expr_type(CType
*type
);
76 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
, int first
, int size_only
);
77 static void block(int *bsym
, int *csym
, int *case_sym
, int *def_sym
, int case_reg
, int is_expr
);
78 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
, int has_init
, int v
, char *asm_label
, int scope
);
79 static int decl0(int l
, int is_for_loop_init
);
80 static void expr_eq(void);
81 static void unary_type(CType
*type
);
82 static void vla_runtime_type_size(CType
*type
, int *a
);
83 static int is_compatible_parameter_types(CType
*type1
, CType
*type2
);
84 static void expr_type(CType
*type
);
86 ST_INLN
int is_float(int t
)
90 return bt
== VT_LDOUBLE
|| bt
== VT_DOUBLE
|| bt
== VT_FLOAT
;
93 /* we use our own 'finite' function to avoid potential problems with
94 non standard math libs */
95 /* XXX: endianness dependent */
96 ST_FUNC
int ieee_finite(double d
)
99 return ((unsigned)((p
[1] | 0x800fffff) + 1)) >> 31;
102 ST_FUNC
void test_lvalue(void)
104 if (!(vtop
->r
& VT_LVAL
))
108 /* ------------------------------------------------------------------------- */
109 /* symbol allocator */
110 static Sym
*__sym_malloc(void)
112 Sym
*sym_pool
, *sym
, *last_sym
;
115 sym_pool
= tcc_malloc(SYM_POOL_NB
* sizeof(Sym
));
116 dynarray_add(&sym_pools
, &nb_sym_pools
, sym_pool
);
118 last_sym
= sym_free_first
;
120 for(i
= 0; i
< SYM_POOL_NB
; i
++) {
121 sym
->next
= last_sym
;
125 sym_free_first
= last_sym
;
129 static inline Sym
*sym_malloc(void)
132 sym
= sym_free_first
;
134 sym
= __sym_malloc();
135 sym_free_first
= sym
->next
;
139 ST_INLN
void sym_free(Sym
*sym
)
141 sym
->next
= sym_free_first
;
142 tcc_free(sym
->asm_label
);
143 sym_free_first
= sym
;
146 /* push, without hashing */
147 ST_FUNC Sym
*sym_push2(Sym
**ps
, int v
, int t
, long c
)
166 /* find a symbol and return its associated structure. 's' is the top
167 of the symbol stack */
168 ST_FUNC Sym
*sym_find2(Sym
*s
, int v
)
178 /* structure lookup */
179 ST_INLN Sym
*struct_find(int v
)
182 if ((unsigned)v
>= (unsigned)(tok_ident
- TOK_IDENT
))
184 return table_ident
[v
]->sym_struct
;
187 /* find an identifier */
188 ST_INLN Sym
*sym_find(int v
)
191 if ((unsigned)v
>= (unsigned)(tok_ident
- TOK_IDENT
))
193 return table_ident
[v
]->sym_identifier
;
196 /* push a given symbol on the symbol stack */
197 ST_FUNC Sym
*sym_push(int v
, CType
*type
, int r
, int c
)
206 s
= sym_push2(ps
, v
, type
->t
, c
);
207 s
->type
.ref
= type
->ref
;
209 /* don't record fields or anonymous symbols */
211 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
212 /* record symbol in token array */
213 ts
= table_ident
[(v
& ~SYM_STRUCT
) - TOK_IDENT
];
215 ps
= &ts
->sym_struct
;
217 ps
= &ts
->sym_identifier
;
224 /* push a global identifier */
225 ST_FUNC Sym
*global_identifier_push(int v
, int t
, int c
)
228 s
= sym_push2(&global_stack
, v
, t
, c
);
229 /* don't record anonymous symbol */
230 if (v
< SYM_FIRST_ANOM
) {
231 ps
= &table_ident
[v
- TOK_IDENT
]->sym_identifier
;
232 /* modify the top most local identifier, so that
233 sym_identifier will point to 's' when popped */
235 ps
= &(*ps
)->prev_tok
;
242 /* pop symbols until top reaches 'b' */
243 ST_FUNC
void sym_pop(Sym
**ptop
, Sym
*b
)
253 /* remove symbol in token array */
255 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
256 ts
= table_ident
[(v
& ~SYM_STRUCT
) - TOK_IDENT
];
258 ps
= &ts
->sym_struct
;
260 ps
= &ts
->sym_identifier
;
269 static void weaken_symbol(Sym
*sym
)
271 sym
->type
.t
|= VT_WEAK
;
276 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
277 esym_type
= ELFW(ST_TYPE
)(esym
->st_info
);
278 esym
->st_info
= ELFW(ST_INFO
)(STB_WEAK
, esym_type
);
282 /* ------------------------------------------------------------------------- */
284 ST_FUNC
void swap(int *p
, int *q
)
292 static void vsetc(CType
*type
, int r
, CValue
*vc
)
296 if (vtop
>= vstack
+ (VSTACK_SIZE
- 1))
297 tcc_error("memory full");
298 /* cannot let cpu flags if other instruction are generated. Also
299 avoid leaving VT_JMP anywhere except on the top of the stack
300 because it would complicate the code generator. */
301 if (vtop
>= vstack
) {
302 v
= vtop
->r
& VT_VALMASK
;
303 if (v
== VT_CMP
|| (v
& ~1) == VT_JMP
)
313 /* push constant of type "type" with useless value */
314 void vpush(CType
*type
)
317 vsetc(type
, VT_CONST
, &cval
);
320 /* push integer constant */
321 ST_FUNC
void vpushi(int v
)
325 vsetc(&int_type
, VT_CONST
, &cval
);
328 /* push long long constant */
329 static void vpushll(long long v
)
336 vsetc(&ctype
, VT_CONST
, &cval
);
339 /* push arbitrary 64bit constant */
340 void vpush64(int ty
, unsigned long long v
)
346 vsetc(&ctype
, VT_CONST
, &cval
);
349 /* Return a static symbol pointing to a section */
350 ST_FUNC Sym
*get_sym_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
356 sym
= global_identifier_push(v
, type
->t
| VT_STATIC
, 0);
357 sym
->type
.ref
= type
->ref
;
358 sym
->r
= VT_CONST
| VT_SYM
;
359 put_extern_sym(sym
, sec
, offset
, size
);
363 /* push a reference to a section offset by adding a dummy symbol */
364 static void vpush_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
369 vsetc(type
, VT_CONST
| VT_SYM
, &cval
);
370 vtop
->sym
= get_sym_ref(type
, sec
, offset
, size
);
373 /* define a new external reference to a symbol 'v' of type 'u' */
374 ST_FUNC Sym
*external_global_sym(int v
, CType
*type
, int r
)
380 /* push forward reference */
381 s
= global_identifier_push(v
, type
->t
| VT_EXTERN
, 0);
382 s
->type
.ref
= type
->ref
;
383 s
->r
= r
| VT_CONST
| VT_SYM
;
388 /* define a new external reference to a symbol 'v' with alternate asm
389 name 'asm_label' of type 'u'. 'asm_label' is equal to NULL if there
390 is no alternate name (most cases) */
391 static Sym
*external_sym(int v
, CType
*type
, int r
, char *asm_label
)
397 /* push forward reference */
398 s
= sym_push(v
, type
, r
| VT_CONST
| VT_SYM
, 0);
399 s
->asm_label
= asm_label
;
400 s
->type
.t
|= VT_EXTERN
;
401 } else if (s
->type
.ref
== func_old_type
.ref
) {
402 s
->type
.ref
= type
->ref
;
403 s
->r
= r
| VT_CONST
| VT_SYM
;
404 s
->type
.t
|= VT_EXTERN
;
405 } else if (!is_compatible_types(&s
->type
, type
)) {
406 tcc_error("incompatible types for redefinition of '%s'",
407 get_tok_str(v
, NULL
));
412 /* push a reference to global symbol v */
413 ST_FUNC
void vpush_global_sym(CType
*type
, int v
)
418 sym
= external_global_sym(v
, type
, 0);
420 vsetc(type
, VT_CONST
| VT_SYM
, &cval
);
424 ST_FUNC
void vset(CType
*type
, int r
, int v
)
429 vsetc(type
, r
, &cval
);
432 static void vseti(int r
, int v
)
440 ST_FUNC
void vswap(void)
449 ST_FUNC
void vpushv(SValue
*v
)
451 if (vtop
>= vstack
+ (VSTACK_SIZE
- 1))
452 tcc_error("memory full");
457 static void vdup(void)
462 /* save r to the memory stack, and mark it as being free */
463 ST_FUNC
void save_reg(int r
)
465 int l
, saved
, size
, align
;
469 /* modify all stack values */
472 for(p
=vstack
;p
<=vtop
;p
++) {
473 if ((p
->r
& VT_VALMASK
) == r
||
474 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& (p
->r2
& VT_VALMASK
) == r
)) {
475 /* must save value on stack if not already done */
477 /* NOTE: must reload 'r' because r might be equal to r2 */
478 r
= p
->r
& VT_VALMASK
;
479 /* store register in the stack */
481 if ((p
->r
& VT_LVAL
) ||
482 (!is_float(type
->t
) && (type
->t
& VT_BTYPE
) != VT_LLONG
))
483 #ifdef TCC_TARGET_X86_64
484 type
= &char_pointer_type
;
488 size
= type_size(type
, &align
);
489 loc
= (loc
- size
) & -align
;
491 sv
.r
= VT_LOCAL
| VT_LVAL
;
494 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
495 /* x86 specific: need to pop fp register ST0 if saved */
497 o(0xd8dd); /* fstp %st(0) */
500 #ifndef TCC_TARGET_X86_64
501 /* special long long case */
502 if ((type
->t
& VT_BTYPE
) == VT_LLONG
) {
510 /* mark that stack entry as being saved on the stack */
511 if (p
->r
& VT_LVAL
) {
512 /* also clear the bounded flag because the
513 relocation address of the function was stored in
515 p
->r
= (p
->r
& ~(VT_VALMASK
| VT_BOUNDED
)) | VT_LLOCAL
;
517 p
->r
= lvalue_type(p
->type
.t
) | VT_LOCAL
;
525 #ifdef TCC_TARGET_ARM
526 /* find a register of class 'rc2' with at most one reference on stack.
527 * If none, call get_reg(rc) */
528 ST_FUNC
int get_reg_ex(int rc
, int rc2
)
533 for(r
=0;r
<NB_REGS
;r
++) {
534 if (reg_classes
[r
] & rc2
) {
537 for(p
= vstack
; p
<= vtop
; p
++) {
538 if ((p
->r
& VT_VALMASK
) == r
||
539 (p
->r2
& VT_VALMASK
) == r
)
550 /* find a free register of class 'rc'. If none, save one register */
551 ST_FUNC
int get_reg(int rc
)
556 /* find a free register */
557 for(r
=0;r
<NB_REGS
;r
++) {
558 if (reg_classes
[r
] & rc
) {
559 for(p
=vstack
;p
<=vtop
;p
++) {
560 if ((p
->r
& VT_VALMASK
) == r
||
561 (p
->r2
& VT_VALMASK
) == r
)
569 /* no register left : free the first one on the stack (VERY
570 IMPORTANT to start from the bottom to ensure that we don't
571 spill registers used in gen_opi()) */
572 for(p
=vstack
;p
<=vtop
;p
++) {
573 r
= p
->r
& VT_VALMASK
;
574 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
))
576 /* also look at second register (if long long) */
577 r
= p
->r2
& VT_VALMASK
;
578 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
)) {
584 /* Should never comes here */
588 /* save registers up to (vtop - n) stack entry */
589 ST_FUNC
void save_regs(int n
)
594 for(p
= vstack
;p
<= p1
; p
++) {
595 r
= p
->r
& VT_VALMASK
;
602 /* move register 's' to 'r', and flush previous value of r to memory
604 static void move_reg(int r
, int s
)
617 /* get address of vtop (vtop MUST BE an lvalue) */
618 static void gaddrof(void)
620 if (vtop
->r
& VT_REF
)
623 /* tricky: if saved lvalue, then we can go back to lvalue */
624 if ((vtop
->r
& VT_VALMASK
) == VT_LLOCAL
)
625 vtop
->r
= (vtop
->r
& ~(VT_VALMASK
| VT_LVAL_TYPE
)) | VT_LOCAL
| VT_LVAL
;
630 #ifdef CONFIG_TCC_BCHECK
631 /* generate lvalue bound code */
632 static void gbound(void)
637 vtop
->r
&= ~VT_MUSTBOUND
;
638 /* if lvalue, then use checking code before dereferencing */
639 if (vtop
->r
& VT_LVAL
) {
640 /* if not VT_BOUNDED value, then make one */
641 if (!(vtop
->r
& VT_BOUNDED
)) {
642 lval_type
= vtop
->r
& (VT_LVAL_TYPE
| VT_LVAL
);
643 /* must save type because we must set it to int to get pointer */
645 vtop
->type
.t
= VT_INT
;
648 gen_bounded_ptr_add();
649 vtop
->r
|= lval_type
;
652 /* then check for dereferencing */
653 gen_bounded_ptr_deref();
658 /* store vtop a register belonging to class 'rc'. lvalues are
659 converted to values. Cannot be used if cannot be converted to
660 register value (such as structures). */
661 ST_FUNC
int gv(int rc
)
663 int r
, bit_pos
, bit_size
, size
, align
, i
;
664 #ifndef TCC_TARGET_X86_64
668 /* NOTE: get_reg can modify vstack[] */
669 if (vtop
->type
.t
& VT_BITFIELD
) {
672 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
673 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
674 /* remove bit field info to avoid loops */
675 vtop
->type
.t
&= ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
));
676 /* cast to int to propagate signedness in following ops */
677 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
682 if((vtop
->type
.t
& VT_UNSIGNED
) ||
683 (vtop
->type
.t
& VT_BTYPE
) == VT_BOOL
)
684 type
.t
|= VT_UNSIGNED
;
686 /* generate shifts */
687 vpushi(bits
- (bit_pos
+ bit_size
));
689 vpushi(bits
- bit_size
);
690 /* NOTE: transformed to SHR if unsigned */
694 if (is_float(vtop
->type
.t
) &&
695 (vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
698 unsigned long offset
;
699 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
703 /* XXX: unify with initializers handling ? */
704 /* CPUs usually cannot use float constants, so we store them
705 generically in data segment */
706 size
= type_size(&vtop
->type
, &align
);
707 offset
= (data_section
->data_offset
+ align
- 1) & -align
;
708 data_section
->data_offset
= offset
;
709 /* XXX: not portable yet */
710 #if defined(__i386__) || defined(__x86_64__)
711 /* Zero pad x87 tenbyte long doubles */
712 if (size
== LDOUBLE_SIZE
) {
713 vtop
->c
.tab
[2] &= 0xffff;
714 #if LDOUBLE_SIZE == 16
719 ptr
= section_ptr_add(data_section
, size
);
721 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
725 ptr
[i
] = vtop
->c
.tab
[size
-1-i
];
729 ptr
[i
] = vtop
->c
.tab
[i
];
730 sym
= get_sym_ref(&vtop
->type
, data_section
, offset
, size
<< 2);
731 vtop
->r
|= VT_LVAL
| VT_SYM
;
735 #ifdef CONFIG_TCC_BCHECK
736 if (vtop
->r
& VT_MUSTBOUND
)
740 r
= vtop
->r
& VT_VALMASK
;
741 #ifndef TCC_TARGET_X86_64
746 /* need to reload if:
748 - lvalue (need to dereference pointer)
749 - already a register, but not in the right class */
751 || (vtop
->r
& VT_LVAL
)
752 || !(reg_classes
[r
] & rc
)
753 #ifndef TCC_TARGET_X86_64
754 || ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
&& !(reg_classes
[vtop
->r2
] & rc2
))
759 #ifndef TCC_TARGET_X86_64
760 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
762 unsigned long long ll
;
763 /* two register type load : expand to two words
765 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
768 vtop
->c
.ui
= ll
; /* first word */
770 vtop
->r
= r
; /* save register value */
771 vpushi(ll
>> 32); /* second word */
772 } else if (r
>= VT_CONST
|| /* XXX: test to VT_CONST incorrect ? */
773 (vtop
->r
& VT_LVAL
)) {
774 /* We do not want to modifier the long long
775 pointer here, so the safest (and less
776 efficient) is to save all the other registers
777 in the stack. XXX: totally inefficient. */
779 /* load from memory */
782 vtop
[-1].r
= r
; /* save register value */
783 /* increment pointer to get second word */
784 vtop
->type
.t
= VT_INT
;
793 vtop
[-1].r
= r
; /* save register value */
794 vtop
->r
= vtop
[-1].r2
;
796 /* allocate second register */
800 /* write second register */
804 if ((vtop
->r
& VT_LVAL
) && !is_float(vtop
->type
.t
)) {
806 /* lvalue of scalar type : need to use lvalue type
807 because of possible cast */
810 /* compute memory access type */
811 if (vtop
->r
& VT_LVAL_BYTE
)
813 else if (vtop
->r
& VT_LVAL_SHORT
)
815 if (vtop
->r
& VT_LVAL_UNSIGNED
)
819 /* restore wanted type */
822 /* one register type load */
827 #ifdef TCC_TARGET_C67
828 /* uses register pairs for doubles */
829 if ((vtop
->type
.t
& VT_BTYPE
) == VT_DOUBLE
)
836 /* generate vtop[-1] and vtop[0] in resp. classes rc1 and rc2 */
837 ST_FUNC
void gv2(int rc1
, int rc2
)
841 /* generate more generic register first. But VT_JMP or VT_CMP
842 values must be generated first in all cases to avoid possible
844 v
= vtop
[0].r
& VT_VALMASK
;
845 if (v
!= VT_CMP
&& (v
& ~1) != VT_JMP
&& rc1
<= rc2
) {
850 /* test if reload is needed for first register */
851 if ((vtop
[-1].r
& VT_VALMASK
) >= VT_CONST
) {
861 /* test if reload is needed for first register */
862 if ((vtop
[0].r
& VT_VALMASK
) >= VT_CONST
) {
868 /* wrapper around RC_FRET to return a register by type */
869 static int rc_fret(int t
)
871 #ifdef TCC_TARGET_X86_64
872 if (t
== VT_LDOUBLE
) {
879 /* wrapper around REG_FRET to return a register by type */
880 static int reg_fret(int t
)
882 #ifdef TCC_TARGET_X86_64
883 if (t
== VT_LDOUBLE
) {
890 /* expand long long on stack in two int registers */
891 static void lexpand(void)
895 u
= vtop
->type
.t
& VT_UNSIGNED
;
898 vtop
[0].r
= vtop
[-1].r2
;
899 vtop
[0].r2
= VT_CONST
;
900 vtop
[-1].r2
= VT_CONST
;
901 vtop
[0].type
.t
= VT_INT
| u
;
902 vtop
[-1].type
.t
= VT_INT
| u
;
905 #ifdef TCC_TARGET_ARM
906 /* expand long long on stack */
907 ST_FUNC
void lexpand_nr(void)
911 u
= vtop
->type
.t
& VT_UNSIGNED
;
914 vtop
->type
.t
= VT_INT
| u
;
915 v
=vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
);
917 vtop
[-1].c
.ui
= vtop
->c
.ull
;
918 vtop
->c
.ui
= vtop
->c
.ull
>> 32;
920 } else if (v
== (VT_LVAL
|VT_CONST
) || v
== (VT_LVAL
|VT_LOCAL
)) {
922 vtop
->r
= vtop
[-1].r
;
923 } else if (v
> VT_CONST
) {
927 vtop
->r
= vtop
[-1].r2
;
928 vtop
[-1].r2
= VT_CONST
;
929 vtop
[-1].type
.t
= VT_INT
| u
;
933 /* build a long long from two ints */
934 static void lbuild(int t
)
937 vtop
[-1].r2
= vtop
[0].r
;
942 /* rotate n first stack elements to the bottom
943 I1 ... In -> I2 ... In I1 [top is right]
945 static void vrotb(int n
)
956 /* rotate n first stack elements to the top
957 I1 ... In -> In I1 ... I(n-1) [top is right]
959 ST_FUNC
void vrott(int n
)
965 for(i
= 0;i
< n
- 1; i
++)
966 vtop
[-i
] = vtop
[-i
- 1];
970 /* pop stack value */
971 ST_FUNC
void vpop(void)
974 v
= vtop
->r
& VT_VALMASK
;
975 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
976 /* for x86, we need to pop the FP stack */
977 if (v
== TREG_ST0
&& !nocode_wanted
) {
978 o(0xd8dd); /* fstp %st(0) */
981 if (v
== VT_JMP
|| v
== VT_JMPI
) {
982 /* need to put correct jump if && or || without test */
988 /* convert stack entry to register and duplicate its value in another
990 static void gv_dup(void)
996 if ((t
& VT_BTYPE
) == VT_LLONG
) {
1003 /* stack: H L L1 H1 */
1011 /* duplicate value */
1016 #ifdef TCC_TARGET_X86_64
1017 if ((t
& VT_BTYPE
) == VT_LDOUBLE
) {
1027 load(r1
, &sv
); /* move r to r1 */
1029 /* duplicates value */
1035 #ifndef TCC_TARGET_X86_64
1036 /* generate CPU independent (unsigned) long long operations */
1037 static void gen_opl(int op
)
1039 int t
, a
, b
, op1
, c
, i
;
1041 unsigned short reg_iret
= REG_IRET
;
1042 unsigned short reg_lret
= REG_LRET
;
1048 func
= TOK___divdi3
;
1051 func
= TOK___udivdi3
;
1054 func
= TOK___moddi3
;
1057 func
= TOK___umoddi3
;
1064 /* call generic long long function */
1065 vpush_global_sym(&func_old_type
, func
);
1070 vtop
->r2
= reg_lret
;
1083 /* stack: L1 H1 L2 H2 */
1088 vtop
[-2] = vtop
[-3];
1091 /* stack: H1 H2 L1 L2 */
1097 /* stack: H1 H2 L1 L2 ML MH */
1100 /* stack: ML MH H1 H2 L1 L2 */
1104 /* stack: ML MH H1 L2 H2 L1 */
1109 /* stack: ML MH M1 M2 */
1112 } else if (op
== '+' || op
== '-') {
1113 /* XXX: add non carry method too (for MIPS or alpha) */
1119 /* stack: H1 H2 (L1 op L2) */
1122 gen_op(op1
+ 1); /* TOK_xxxC2 */
1125 /* stack: H1 H2 (L1 op L2) */
1128 /* stack: (L1 op L2) H1 H2 */
1130 /* stack: (L1 op L2) (H1 op H2) */
1138 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
1139 t
= vtop
[-1].type
.t
;
1143 /* stack: L H shift */
1145 /* constant: simpler */
1146 /* NOTE: all comments are for SHL. the other cases are
1147 done by swaping words */
1158 if (op
!= TOK_SAR
) {
1191 /* XXX: should provide a faster fallback on x86 ? */
1194 func
= TOK___ashrdi3
;
1197 func
= TOK___lshrdi3
;
1200 func
= TOK___ashldi3
;
1206 /* compare operations */
1212 /* stack: L1 H1 L2 H2 */
1214 vtop
[-1] = vtop
[-2];
1216 /* stack: L1 L2 H1 H2 */
1219 /* when values are equal, we need to compare low words. since
1220 the jump is inverted, we invert the test too. */
1223 else if (op1
== TOK_GT
)
1225 else if (op1
== TOK_ULT
)
1227 else if (op1
== TOK_UGT
)
1232 if (op1
!= TOK_NE
) {
1236 /* generate non equal test */
1237 /* XXX: NOT PORTABLE yet */
1241 #if defined(TCC_TARGET_I386)
1242 b
= psym(0x850f, 0);
1243 #elif defined(TCC_TARGET_ARM)
1245 o(0x1A000000 | encbranch(ind
, 0, 1));
1246 #elif defined(TCC_TARGET_C67)
1247 tcc_error("not implemented");
1249 #error not supported
1253 /* compare low. Always unsigned */
1257 else if (op1
== TOK_LE
)
1259 else if (op1
== TOK_GT
)
1261 else if (op1
== TOK_GE
)
1272 /* handle integer constant optimizations and various machine
1274 static void gen_opic(int op
)
1276 int c1
, c2
, t1
, t2
, n
;
1279 typedef unsigned long long U
;
1283 t1
= v1
->type
.t
& VT_BTYPE
;
1284 t2
= v2
->type
.t
& VT_BTYPE
;
1288 else if (v1
->type
.t
& VT_UNSIGNED
)
1295 else if (v2
->type
.t
& VT_UNSIGNED
)
1300 /* currently, we cannot do computations with forward symbols */
1301 c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1302 c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1305 case '+': l1
+= l2
; break;
1306 case '-': l1
-= l2
; break;
1307 case '&': l1
&= l2
; break;
1308 case '^': l1
^= l2
; break;
1309 case '|': l1
|= l2
; break;
1310 case '*': l1
*= l2
; break;
1317 /* if division by zero, generate explicit division */
1320 tcc_error("division by zero in constant");
1324 default: l1
/= l2
; break;
1325 case '%': l1
%= l2
; break;
1326 case TOK_UDIV
: l1
= (U
)l1
/ l2
; break;
1327 case TOK_UMOD
: l1
= (U
)l1
% l2
; break;
1330 case TOK_SHL
: l1
<<= l2
; break;
1331 case TOK_SHR
: l1
= (U
)l1
>> l2
; break;
1332 case TOK_SAR
: l1
>>= l2
; break;
1334 case TOK_ULT
: l1
= (U
)l1
< (U
)l2
; break;
1335 case TOK_UGE
: l1
= (U
)l1
>= (U
)l2
; break;
1336 case TOK_EQ
: l1
= l1
== l2
; break;
1337 case TOK_NE
: l1
= l1
!= l2
; break;
1338 case TOK_ULE
: l1
= (U
)l1
<= (U
)l2
; break;
1339 case TOK_UGT
: l1
= (U
)l1
> (U
)l2
; break;
1340 case TOK_LT
: l1
= l1
< l2
; break;
1341 case TOK_GE
: l1
= l1
>= l2
; break;
1342 case TOK_LE
: l1
= l1
<= l2
; break;
1343 case TOK_GT
: l1
= l1
> l2
; break;
1345 case TOK_LAND
: l1
= l1
&& l2
; break;
1346 case TOK_LOR
: l1
= l1
|| l2
; break;
1353 /* if commutative ops, put c2 as constant */
1354 if (c1
&& (op
== '+' || op
== '&' || op
== '^' ||
1355 op
== '|' || op
== '*')) {
1357 c2
= c1
; //c = c1, c1 = c2, c2 = c;
1358 l2
= l1
; //l = l1, l1 = l2, l2 = l;
1360 /* Filter out NOP operations like x*1, x-0, x&-1... */
1361 if (c2
&& (((op
== '*' || op
== '/' || op
== TOK_UDIV
||
1364 ((op
== '+' || op
== '-' || op
== '|' || op
== '^' ||
1365 op
== TOK_SHL
|| op
== TOK_SHR
|| op
== TOK_SAR
) &&
1371 } else if (c2
&& (op
== '*' || op
== TOK_PDIV
|| op
== TOK_UDIV
)) {
1372 /* try to use shifts instead of muls or divs */
1373 if (l2
> 0 && (l2
& (l2
- 1)) == 0) {
1382 else if (op
== TOK_PDIV
)
1388 } else if (c2
&& (op
== '+' || op
== '-') &&
1389 (((vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
))
1390 || (vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
)) == VT_LOCAL
)) {
1391 /* symbol + constant case */
1398 if (!nocode_wanted
) {
1399 /* call low level op generator */
1400 if (t1
== VT_LLONG
|| t2
== VT_LLONG
)
1411 /* generate a floating point operation with constant propagation */
1412 static void gen_opif(int op
)
1420 /* currently, we cannot do computations with forward symbols */
1421 c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1422 c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1424 if (v1
->type
.t
== VT_FLOAT
) {
1427 } else if (v1
->type
.t
== VT_DOUBLE
) {
1435 /* NOTE: we only do constant propagation if finite number (not
1436 NaN or infinity) (ANSI spec) */
1437 if (!ieee_finite(f1
) || !ieee_finite(f2
))
1441 case '+': f1
+= f2
; break;
1442 case '-': f1
-= f2
; break;
1443 case '*': f1
*= f2
; break;
1447 tcc_error("division by zero in constant");
1452 /* XXX: also handles tests ? */
1456 /* XXX: overflow test ? */
1457 if (v1
->type
.t
== VT_FLOAT
) {
1459 } else if (v1
->type
.t
== VT_DOUBLE
) {
1467 if (!nocode_wanted
) {
1475 static int pointed_size(CType
*type
)
1478 return type_size(pointed_type(type
), &align
);
1481 static void vla_runtime_pointed_size(CType
*type
)
1484 vla_runtime_type_size(pointed_type(type
), &align
);
1487 static inline int is_null_pointer(SValue
*p
)
1489 if ((p
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
1491 return ((p
->type
.t
& VT_BTYPE
) == VT_INT
&& p
->c
.i
== 0) ||
1492 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& p
->c
.ll
== 0) ||
1493 ((p
->type
.t
& VT_BTYPE
) == VT_PTR
&& p
->c
.ptr
== 0);
1496 static inline int is_integer_btype(int bt
)
1498 return (bt
== VT_BYTE
|| bt
== VT_SHORT
||
1499 bt
== VT_INT
|| bt
== VT_LLONG
);
1502 /* check types for comparison or substraction of pointers */
1503 static void check_comparison_pointer_types(SValue
*p1
, SValue
*p2
, int op
)
1505 CType
*type1
, *type2
, tmp_type1
, tmp_type2
;
1508 /* null pointers are accepted for all comparisons as gcc */
1509 if (is_null_pointer(p1
) || is_null_pointer(p2
))
1513 bt1
= type1
->t
& VT_BTYPE
;
1514 bt2
= type2
->t
& VT_BTYPE
;
1515 /* accept comparison between pointer and integer with a warning */
1516 if ((is_integer_btype(bt1
) || is_integer_btype(bt2
)) && op
!= '-') {
1517 if (op
!= TOK_LOR
&& op
!= TOK_LAND
)
1518 tcc_warning("comparison between pointer and integer");
1522 /* both must be pointers or implicit function pointers */
1523 if (bt1
== VT_PTR
) {
1524 type1
= pointed_type(type1
);
1525 } else if (bt1
!= VT_FUNC
)
1526 goto invalid_operands
;
1528 if (bt2
== VT_PTR
) {
1529 type2
= pointed_type(type2
);
1530 } else if (bt2
!= VT_FUNC
) {
1532 tcc_error("invalid operands to binary %s", get_tok_str(op
, NULL
));
1534 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
1535 (type2
->t
& VT_BTYPE
) == VT_VOID
)
1539 tmp_type1
.t
&= ~(VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1540 tmp_type2
.t
&= ~(VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1541 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
1542 /* gcc-like error if '-' is used */
1544 goto invalid_operands
;
1546 tcc_warning("comparison of distinct pointer types lacks a cast");
1550 /* generic gen_op: handles types problems */
1551 ST_FUNC
void gen_op(int op
)
1553 int u
, t1
, t2
, bt1
, bt2
, t
;
1556 t1
= vtop
[-1].type
.t
;
1557 t2
= vtop
[0].type
.t
;
1558 bt1
= t1
& VT_BTYPE
;
1559 bt2
= t2
& VT_BTYPE
;
1561 if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
1562 /* at least one operand is a pointer */
1563 /* relationnal op: must be both pointers */
1564 if (op
>= TOK_ULT
&& op
<= TOK_LOR
) {
1565 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1566 /* pointers are handled are unsigned */
1567 #ifdef TCC_TARGET_X86_64
1568 t
= VT_LLONG
| VT_UNSIGNED
;
1570 t
= VT_INT
| VT_UNSIGNED
;
1574 /* if both pointers, then it must be the '-' op */
1575 if (bt1
== VT_PTR
&& bt2
== VT_PTR
) {
1577 tcc_error("cannot use pointers here");
1578 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1579 /* XXX: check that types are compatible */
1580 if (vtop
[-1].type
.t
& VT_VLA
) {
1581 vla_runtime_pointed_size(&vtop
[-1].type
);
1583 vpushi(pointed_size(&vtop
[-1].type
));
1587 /* set to integer type */
1588 #ifdef TCC_TARGET_X86_64
1589 vtop
->type
.t
= VT_LLONG
;
1591 vtop
->type
.t
= VT_INT
;
1596 /* exactly one pointer : must be '+' or '-'. */
1597 if (op
!= '-' && op
!= '+')
1598 tcc_error("cannot use pointers here");
1599 /* Put pointer as first operand */
1600 if (bt2
== VT_PTR
) {
1604 type1
= vtop
[-1].type
;
1605 type1
.t
&= ~VT_ARRAY
;
1606 if (vtop
[-1].type
.t
& VT_VLA
)
1607 vla_runtime_pointed_size(&vtop
[-1].type
);
1609 u
= pointed_size(&vtop
[-1].type
);
1611 tcc_error("unknown array element size");
1612 #ifdef TCC_TARGET_X86_64
1615 /* XXX: cast to int ? (long long case) */
1620 #ifdef CONFIG_TCC_BCHECK
1621 /* if evaluating constant expression, no code should be
1622 generated, so no bound check */
1623 if (tcc_state
->do_bounds_check
&& !const_wanted
) {
1624 /* if bounded pointers, we generate a special code to
1631 gen_bounded_ptr_add();
1637 /* put again type if gen_opic() swaped operands */
1640 } else if (is_float(bt1
) || is_float(bt2
)) {
1641 /* compute bigger type and do implicit casts */
1642 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
1644 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
1649 /* floats can only be used for a few operations */
1650 if (op
!= '+' && op
!= '-' && op
!= '*' && op
!= '/' &&
1651 (op
< TOK_ULT
|| op
> TOK_GT
))
1652 tcc_error("invalid operands for binary operation");
1654 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
1655 /* cast to biggest op */
1657 /* convert to unsigned if it does not fit in a long long */
1658 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
1659 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
1663 /* integer operations */
1665 /* convert to unsigned if it does not fit in an integer */
1666 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
1667 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
1670 /* XXX: currently, some unsigned operations are explicit, so
1671 we modify them here */
1672 if (t
& VT_UNSIGNED
) {
1679 else if (op
== TOK_LT
)
1681 else if (op
== TOK_GT
)
1683 else if (op
== TOK_LE
)
1685 else if (op
== TOK_GE
)
1692 /* special case for shifts and long long: we keep the shift as
1694 if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
)
1701 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
1702 /* relationnal op: the result is an int */
1703 vtop
->type
.t
= VT_INT
;
1710 #ifndef TCC_TARGET_ARM
1711 /* generic itof for unsigned long long case */
1712 static void gen_cvt_itof1(int t
)
1714 if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
1715 (VT_LLONG
| VT_UNSIGNED
)) {
1718 vpush_global_sym(&func_old_type
, TOK___floatundisf
);
1719 #if LDOUBLE_SIZE != 8
1720 else if (t
== VT_LDOUBLE
)
1721 vpush_global_sym(&func_old_type
, TOK___floatundixf
);
1724 vpush_global_sym(&func_old_type
, TOK___floatundidf
);
1728 vtop
->r
= reg_fret(t
);
1735 /* generic ftoi for unsigned long long case */
1736 static void gen_cvt_ftoi1(int t
)
1740 if (t
== (VT_LLONG
| VT_UNSIGNED
)) {
1741 /* not handled natively */
1742 st
= vtop
->type
.t
& VT_BTYPE
;
1744 vpush_global_sym(&func_old_type
, TOK___fixunssfdi
);
1745 #if LDOUBLE_SIZE != 8
1746 else if (st
== VT_LDOUBLE
)
1747 vpush_global_sym(&func_old_type
, TOK___fixunsxfdi
);
1750 vpush_global_sym(&func_old_type
, TOK___fixunsdfdi
);
1755 vtop
->r2
= REG_LRET
;
1761 /* force char or short cast */
1762 static void force_charshort_cast(int t
)
1766 /* XXX: add optimization if lvalue : just change type and offset */
1771 if (t
& VT_UNSIGNED
) {
1772 vpushi((1 << bits
) - 1);
1778 /* result must be signed or the SAR is converted to an SHL
1779 This was not the case when "t" was a signed short
1780 and the last value on the stack was an unsigned int */
1781 vtop
->type
.t
&= ~VT_UNSIGNED
;
1787 /* cast 'vtop' to 'type'. Casting to bitfields is forbidden. */
1788 static void gen_cast(CType
*type
)
1790 int sbt
, dbt
, sf
, df
, c
, p
;
1792 /* special delayed cast for char/short */
1793 /* XXX: in some cases (multiple cascaded casts), it may still
1795 if (vtop
->r
& VT_MUSTCAST
) {
1796 vtop
->r
&= ~VT_MUSTCAST
;
1797 force_charshort_cast(vtop
->type
.t
);
1800 /* bitfields first get cast to ints */
1801 if (vtop
->type
.t
& VT_BITFIELD
) {
1805 dbt
= type
->t
& (VT_BTYPE
| VT_UNSIGNED
);
1806 sbt
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
1811 c
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1812 p
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
);
1814 /* constant case: we can do it now */
1815 /* XXX: in ISOC, cannot do it if error in convert */
1816 if (sbt
== VT_FLOAT
)
1817 vtop
->c
.ld
= vtop
->c
.f
;
1818 else if (sbt
== VT_DOUBLE
)
1819 vtop
->c
.ld
= vtop
->c
.d
;
1822 if ((sbt
& VT_BTYPE
) == VT_LLONG
) {
1823 if (sbt
& VT_UNSIGNED
)
1824 vtop
->c
.ld
= vtop
->c
.ull
;
1826 vtop
->c
.ld
= vtop
->c
.ll
;
1828 if (sbt
& VT_UNSIGNED
)
1829 vtop
->c
.ld
= vtop
->c
.ui
;
1831 vtop
->c
.ld
= vtop
->c
.i
;
1834 if (dbt
== VT_FLOAT
)
1835 vtop
->c
.f
= (float)vtop
->c
.ld
;
1836 else if (dbt
== VT_DOUBLE
)
1837 vtop
->c
.d
= (double)vtop
->c
.ld
;
1838 } else if (sf
&& dbt
== (VT_LLONG
|VT_UNSIGNED
)) {
1839 vtop
->c
.ull
= (unsigned long long)vtop
->c
.ld
;
1840 } else if (sf
&& dbt
== VT_BOOL
) {
1841 vtop
->c
.i
= (vtop
->c
.ld
!= 0);
1844 vtop
->c
.ll
= (long long)vtop
->c
.ld
;
1845 else if (sbt
== (VT_LLONG
|VT_UNSIGNED
))
1846 vtop
->c
.ll
= vtop
->c
.ull
;
1847 else if (sbt
& VT_UNSIGNED
)
1848 vtop
->c
.ll
= vtop
->c
.ui
;
1849 #ifdef TCC_TARGET_X86_64
1850 else if (sbt
== VT_PTR
)
1853 else if (sbt
!= VT_LLONG
)
1854 vtop
->c
.ll
= vtop
->c
.i
;
1856 if (dbt
== (VT_LLONG
|VT_UNSIGNED
))
1857 vtop
->c
.ull
= vtop
->c
.ll
;
1858 else if (dbt
== VT_BOOL
)
1859 vtop
->c
.i
= (vtop
->c
.ll
!= 0);
1860 else if (dbt
!= VT_LLONG
) {
1862 if ((dbt
& VT_BTYPE
) == VT_BYTE
)
1864 else if ((dbt
& VT_BTYPE
) == VT_SHORT
)
1867 if(dbt
& VT_UNSIGNED
)
1868 vtop
->c
.ui
= ((unsigned int)vtop
->c
.ll
<< s
) >> s
;
1870 vtop
->c
.i
= ((int)vtop
->c
.ll
<< s
) >> s
;
1873 } else if (p
&& dbt
== VT_BOOL
) {
1876 } else if (!nocode_wanted
) {
1877 /* non constant case: generate code */
1879 /* convert from fp to fp */
1882 /* convert int to fp */
1885 /* convert fp to int */
1886 if (dbt
== VT_BOOL
) {
1890 /* we handle char/short/etc... with generic code */
1891 if (dbt
!= (VT_INT
| VT_UNSIGNED
) &&
1892 dbt
!= (VT_LLONG
| VT_UNSIGNED
) &&
1896 if (dbt
== VT_INT
&& (type
->t
& (VT_BTYPE
| VT_UNSIGNED
)) != dbt
) {
1897 /* additional cast for char/short... */
1902 #ifndef TCC_TARGET_X86_64
1903 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
) {
1904 if ((sbt
& VT_BTYPE
) != VT_LLONG
) {
1905 /* scalar to long long */
1906 /* machine independent conversion */
1908 /* generate high word */
1909 if (sbt
== (VT_INT
| VT_UNSIGNED
)) {
1913 if (sbt
== VT_PTR
) {
1914 /* cast from pointer to int before we apply
1915 shift operation, which pointers don't support*/
1916 gen_cast(&int_type
);
1922 /* patch second register */
1923 vtop
[-1].r2
= vtop
->r
;
1927 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
||
1928 (dbt
& VT_BTYPE
) == VT_PTR
||
1929 (dbt
& VT_BTYPE
) == VT_FUNC
) {
1930 if ((sbt
& VT_BTYPE
) != VT_LLONG
&&
1931 (sbt
& VT_BTYPE
) != VT_PTR
&&
1932 (sbt
& VT_BTYPE
) != VT_FUNC
) {
1933 /* need to convert from 32bit to 64bit */
1935 if (sbt
!= (VT_INT
| VT_UNSIGNED
)) {
1936 /* x86_64 specific: movslq */
1938 o(0xc0 + (REG_VALUE(r
) << 3) + REG_VALUE(r
));
1942 } else if (dbt
== VT_BOOL
) {
1943 /* scalar to bool */
1946 } else if ((dbt
& VT_BTYPE
) == VT_BYTE
||
1947 (dbt
& VT_BTYPE
) == VT_SHORT
) {
1948 if (sbt
== VT_PTR
) {
1949 vtop
->type
.t
= VT_INT
;
1950 tcc_warning("nonportable conversion from pointer to char/short");
1952 force_charshort_cast(dbt
);
1953 } else if ((dbt
& VT_BTYPE
) == VT_INT
) {
1955 if (sbt
== VT_LLONG
) {
1956 /* from long long: just take low order word */
1960 /* if lvalue and single word type, nothing to do because
1961 the lvalue already contains the real type size (see
1962 VT_LVAL_xxx constants) */
1965 } else if ((dbt
& VT_BTYPE
) == VT_PTR
&& !(vtop
->r
& VT_LVAL
)) {
1966 /* if we are casting between pointer types,
1967 we must update the VT_LVAL_xxx size */
1968 vtop
->r
= (vtop
->r
& ~VT_LVAL_TYPE
)
1969 | (lvalue_type(type
->ref
->type
.t
) & VT_LVAL_TYPE
);
1974 /* return type size as known at compile time. Put alignment at 'a' */
1975 ST_FUNC
int type_size(CType
*type
, int *a
)
1980 bt
= type
->t
& VT_BTYPE
;
1981 if (bt
== VT_STRUCT
) {
1986 } else if (bt
== VT_PTR
) {
1987 if (type
->t
& VT_ARRAY
) {
1991 ts
= type_size(&s
->type
, a
);
1993 if (ts
< 0 && s
->c
< 0)
2001 } else if (bt
== VT_LDOUBLE
) {
2003 return LDOUBLE_SIZE
;
2004 } else if (bt
== VT_DOUBLE
|| bt
== VT_LLONG
) {
2005 #ifdef TCC_TARGET_I386
2006 #ifdef TCC_TARGET_PE
2011 #elif defined(TCC_TARGET_ARM)
2021 } else if (bt
== VT_INT
|| bt
== VT_ENUM
|| bt
== VT_FLOAT
) {
2024 } else if (bt
== VT_SHORT
) {
2028 /* char, void, function, _Bool */
2034 /* push type size as known at runtime time on top of value stack. Put
2036 ST_FUNC
void vla_runtime_type_size(CType
*type
, int *a
)
2038 if (type
->t
& VT_VLA
) {
2039 vset(&int_type
, VT_LOCAL
|VT_LVAL
, type
->ref
->c
);
2041 vpushi(type_size(type
, a
));
2045 /* return the pointed type of t */
2046 static inline CType
*pointed_type(CType
*type
)
2048 return &type
->ref
->type
;
2051 /* modify type so that its it is a pointer to type. */
2052 ST_FUNC
void mk_pointer(CType
*type
)
2055 s
= sym_push(SYM_FIELD
, type
, 0, -1);
2056 type
->t
= VT_PTR
| (type
->t
& ~VT_TYPE
);
2060 /* compare function types. OLD functions match any new functions */
2061 static int is_compatible_func(CType
*type1
, CType
*type2
)
2067 if (!is_compatible_types(&s1
->type
, &s2
->type
))
2069 /* check func_call */
2070 if (FUNC_CALL(s1
->r
) != FUNC_CALL(s2
->r
))
2072 /* XXX: not complete */
2073 if (s1
->c
== FUNC_OLD
|| s2
->c
== FUNC_OLD
)
2077 while (s1
!= NULL
) {
2080 if (!is_compatible_parameter_types(&s1
->type
, &s2
->type
))
2090 /* return true if type1 and type2 are the same. If unqualified is
2091 true, qualifiers on the types are ignored.
2093 - enums are not checked as gcc __builtin_types_compatible_p ()
2095 static int compare_types(CType
*type1
, CType
*type2
, int unqualified
)
2099 t1
= type1
->t
& VT_TYPE
;
2100 t2
= type2
->t
& VT_TYPE
;
2102 /* strip qualifiers before comparing */
2103 t1
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2104 t2
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2106 /* XXX: bitfields ? */
2109 /* test more complicated cases */
2110 bt1
= t1
& VT_BTYPE
;
2111 if (bt1
== VT_PTR
) {
2112 type1
= pointed_type(type1
);
2113 type2
= pointed_type(type2
);
2114 return is_compatible_types(type1
, type2
);
2115 } else if (bt1
== VT_STRUCT
) {
2116 return (type1
->ref
== type2
->ref
);
2117 } else if (bt1
== VT_FUNC
) {
2118 return is_compatible_func(type1
, type2
);
2124 /* return true if type1 and type2 are exactly the same (including
2127 static int is_compatible_types(CType
*type1
, CType
*type2
)
2129 return compare_types(type1
,type2
,0);
2132 /* return true if type1 and type2 are the same (ignoring qualifiers).
2134 static int is_compatible_parameter_types(CType
*type1
, CType
*type2
)
2136 return compare_types(type1
,type2
,1);
2139 /* print a type. If 'varstr' is not NULL, then the variable is also
2140 printed in the type */
2142 /* XXX: add array and function pointers */
2143 static void type_to_str(char *buf
, int buf_size
,
2144 CType
*type
, const char *varstr
)
2151 t
= type
->t
& VT_TYPE
;
2154 if (t
& VT_CONSTANT
)
2155 pstrcat(buf
, buf_size
, "const ");
2156 if (t
& VT_VOLATILE
)
2157 pstrcat(buf
, buf_size
, "volatile ");
2158 if (t
& VT_UNSIGNED
)
2159 pstrcat(buf
, buf_size
, "unsigned ");
2189 tstr
= "long double";
2191 pstrcat(buf
, buf_size
, tstr
);
2195 if (bt
== VT_STRUCT
)
2199 pstrcat(buf
, buf_size
, tstr
);
2200 v
= type
->ref
->v
& ~SYM_STRUCT
;
2201 if (v
>= SYM_FIRST_ANOM
)
2202 pstrcat(buf
, buf_size
, "<anonymous>");
2204 pstrcat(buf
, buf_size
, get_tok_str(v
, NULL
));
2208 type_to_str(buf
, buf_size
, &s
->type
, varstr
);
2209 pstrcat(buf
, buf_size
, "(");
2211 while (sa
!= NULL
) {
2212 type_to_str(buf1
, sizeof(buf1
), &sa
->type
, NULL
);
2213 pstrcat(buf
, buf_size
, buf1
);
2216 pstrcat(buf
, buf_size
, ", ");
2218 pstrcat(buf
, buf_size
, ")");
2222 pstrcpy(buf1
, sizeof(buf1
), "*");
2224 pstrcat(buf1
, sizeof(buf1
), varstr
);
2225 type_to_str(buf
, buf_size
, &s
->type
, buf1
);
2229 pstrcat(buf
, buf_size
, " ");
2230 pstrcat(buf
, buf_size
, varstr
);
2235 /* verify type compatibility to store vtop in 'dt' type, and generate
2237 static void gen_assign_cast(CType
*dt
)
2239 CType
*st
, *type1
, *type2
, tmp_type1
, tmp_type2
;
2240 char buf1
[256], buf2
[256];
2243 st
= &vtop
->type
; /* source type */
2244 dbt
= dt
->t
& VT_BTYPE
;
2245 sbt
= st
->t
& VT_BTYPE
;
2247 tcc_error("Cannot assign void value");
2248 if (dt
->t
& VT_CONSTANT
)
2249 tcc_warning("assignment of read-only location");
2252 /* special cases for pointers */
2253 /* '0' can also be a pointer */
2254 if (is_null_pointer(vtop
))
2256 /* accept implicit pointer to integer cast with warning */
2257 if (is_integer_btype(sbt
)) {
2258 tcc_warning("assignment makes pointer from integer without a cast");
2261 type1
= pointed_type(dt
);
2262 /* a function is implicitely a function pointer */
2263 if (sbt
== VT_FUNC
) {
2264 if ((type1
->t
& VT_BTYPE
) != VT_VOID
&&
2265 !is_compatible_types(pointed_type(dt
), st
))
2266 tcc_warning("assignment from incompatible pointer type");
2271 type2
= pointed_type(st
);
2272 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
2273 (type2
->t
& VT_BTYPE
) == VT_VOID
) {
2274 /* void * can match anything */
2276 /* exact type match, except for unsigned */
2279 tmp_type1
.t
&= ~(VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
2280 tmp_type2
.t
&= ~(VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
2281 if (!is_compatible_types(&tmp_type1
, &tmp_type2
))
2282 tcc_warning("assignment from incompatible pointer type");
2284 /* check const and volatile */
2285 if ((!(type1
->t
& VT_CONSTANT
) && (type2
->t
& VT_CONSTANT
)) ||
2286 (!(type1
->t
& VT_VOLATILE
) && (type2
->t
& VT_VOLATILE
)))
2287 tcc_warning("assignment discards qualifiers from pointer target type");
2293 if (sbt
== VT_PTR
|| sbt
== VT_FUNC
) {
2294 tcc_warning("assignment makes integer from pointer without a cast");
2296 /* XXX: more tests */
2301 tmp_type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2302 tmp_type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2303 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
2305 type_to_str(buf1
, sizeof(buf1
), st
, NULL
);
2306 type_to_str(buf2
, sizeof(buf2
), dt
, NULL
);
2307 tcc_error("cannot cast '%s' to '%s'", buf1
, buf2
);
2315 /* store vtop in lvalue pushed on stack */
2316 ST_FUNC
void vstore(void)
2318 int sbt
, dbt
, ft
, r
, t
, size
, align
, bit_size
, bit_pos
, rc
, delayed_cast
;
2320 ft
= vtop
[-1].type
.t
;
2321 sbt
= vtop
->type
.t
& VT_BTYPE
;
2322 dbt
= ft
& VT_BTYPE
;
2323 if ((((sbt
== VT_INT
|| sbt
== VT_SHORT
) && dbt
== VT_BYTE
) ||
2324 (sbt
== VT_INT
&& dbt
== VT_SHORT
))
2325 && !(vtop
->type
.t
& VT_BITFIELD
)) {
2326 /* optimize char/short casts */
2327 delayed_cast
= VT_MUSTCAST
;
2328 vtop
->type
.t
= ft
& (VT_TYPE
& ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
)));
2329 /* XXX: factorize */
2330 if (ft
& VT_CONSTANT
)
2331 tcc_warning("assignment of read-only location");
2334 if (!(ft
& VT_BITFIELD
))
2335 gen_assign_cast(&vtop
[-1].type
);
2338 if (sbt
== VT_STRUCT
) {
2339 /* if structure, only generate pointer */
2340 /* structure assignment : generate memcpy */
2341 /* XXX: optimize if small size */
2342 if (!nocode_wanted
) {
2343 size
= type_size(&vtop
->type
, &align
);
2347 vtop
->type
.t
= VT_PTR
;
2350 /* address of memcpy() */
2353 vpush_global_sym(&func_old_type
, TOK_memcpy8
);
2354 else if(!(align
& 3))
2355 vpush_global_sym(&func_old_type
, TOK_memcpy4
);
2358 vpush_global_sym(&func_old_type
, TOK_memcpy
);
2363 vtop
->type
.t
= VT_PTR
;
2372 /* leave source on stack */
2373 } else if (ft
& VT_BITFIELD
) {
2374 /* bitfield store handling */
2375 bit_pos
= (ft
>> VT_STRUCT_SHIFT
) & 0x3f;
2376 bit_size
= (ft
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
2377 /* remove bit field info to avoid loops */
2378 vtop
[-1].type
.t
= ft
& ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
));
2380 /* duplicate source into other register */
2385 if((ft
& VT_BTYPE
) == VT_BOOL
) {
2386 gen_cast(&vtop
[-1].type
);
2387 vtop
[-1].type
.t
= (vtop
[-1].type
.t
& ~VT_BTYPE
) | (VT_BYTE
| VT_UNSIGNED
);
2390 /* duplicate destination */
2392 vtop
[-1] = vtop
[-2];
2394 /* mask and shift source */
2395 if((ft
& VT_BTYPE
) != VT_BOOL
) {
2396 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2397 vpushll((1ULL << bit_size
) - 1ULL);
2399 vpushi((1 << bit_size
) - 1);
2405 /* load destination, mask and or with source */
2407 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2408 vpushll(~(((1ULL << bit_size
) - 1ULL) << bit_pos
));
2410 vpushi(~(((1 << bit_size
) - 1) << bit_pos
));
2417 /* pop off shifted source from "duplicate source..." above */
2421 #ifdef CONFIG_TCC_BCHECK
2422 /* bound check case */
2423 if (vtop
[-1].r
& VT_MUSTBOUND
) {
2429 if (!nocode_wanted
) {
2433 #ifdef TCC_TARGET_X86_64
2434 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
2439 r
= gv(rc
); /* generate value */
2440 /* if lvalue was saved on stack, must read it */
2441 if ((vtop
[-1].r
& VT_VALMASK
) == VT_LLOCAL
) {
2443 t
= get_reg(RC_INT
);
2444 #ifdef TCC_TARGET_X86_64
2449 sv
.r
= VT_LOCAL
| VT_LVAL
;
2450 sv
.c
.ul
= vtop
[-1].c
.ul
;
2452 vtop
[-1].r
= t
| VT_LVAL
;
2455 #ifndef TCC_TARGET_X86_64
2456 /* two word case handling : store second register at word + 4 */
2457 if ((ft
& VT_BTYPE
) == VT_LLONG
) {
2459 /* convert to int to increment easily */
2460 vtop
->type
.t
= VT_INT
;
2466 /* XXX: it works because r2 is spilled last ! */
2467 store(vtop
->r2
, vtop
- 1);
2472 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
2473 vtop
->r
|= delayed_cast
;
2477 /* post defines POST/PRE add. c is the token ++ or -- */
2478 ST_FUNC
void inc(int post
, int c
)
2481 vdup(); /* save lvalue */
2483 gv_dup(); /* duplicate value */
2488 vpushi(c
- TOK_MID
);
2490 vstore(); /* store value */
2492 vpop(); /* if post op, return saved value */
2495 /* Parse GNUC __attribute__ extension. Currently, the following
2496 extensions are recognized:
2497 - aligned(n) : set data/function alignment.
2498 - packed : force data alignment to 1
2499 - section(x) : generate data/code in this section.
2500 - unused : currently ignored, but may be used someday.
2501 - regparm(n) : pass function parameters in registers (i386 only)
2503 static void parse_attribute(AttributeDef
*ad
)
2507 while (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
) {
2511 while (tok
!= ')') {
2512 if (tok
< TOK_IDENT
)
2513 expect("attribute name");
2521 expect("section name");
2522 ad
->section
= find_section(tcc_state
, (char *)tokc
.cstr
->data
);
2530 expect("alias(\"target\")");
2531 ad
->alias_target
= /* save string as token, for later */
2532 tok_alloc((char*)tokc
.cstr
->data
, tokc
.cstr
->size
-1)->tok
;
2541 if (n
<= 0 || (n
& (n
- 1)) != 0)
2542 tcc_error("alignment must be a positive power of two");
2559 /* currently, no need to handle it because tcc does not
2560 track unused objects */
2564 /* currently, no need to handle it because tcc does not
2565 track unused objects */
2570 ad
->func_call
= FUNC_CDECL
;
2575 ad
->func_call
= FUNC_STDCALL
;
2577 #ifdef TCC_TARGET_I386
2587 ad
->func_call
= FUNC_FASTCALL1
+ n
- 1;
2593 ad
->func_call
= FUNC_FASTCALLW
;
2600 ad
->mode
= VT_LLONG
+ 1;
2603 ad
->mode
= VT_SHORT
+ 1;
2606 ad
->mode
= VT_INT
+ 1;
2609 tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok
, NULL
));
2616 ad
->func_export
= 1;
2619 ad
->func_import
= 1;
2622 if (tcc_state
->warn_unsupported
)
2623 tcc_warning("'%s' attribute ignored", get_tok_str(t
, NULL
));
2624 /* skip parameters */
2626 int parenthesis
= 0;
2630 else if (tok
== ')')
2633 } while (parenthesis
&& tok
!= -1);
2646 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
2647 static void struct_decl(CType
*type
, int u
)
2649 int a
, v
, size
, align
, maxalign
, c
, offset
;
2650 int bit_size
, bit_pos
, bsize
, bt
, lbit_pos
, prevbt
;
2651 Sym
*s
, *ss
, *ass
, **ps
;
2655 a
= tok
; /* save decl type */
2660 /* struct already defined ? return it */
2662 expect("struct/union/enum name");
2666 tcc_error("invalid type");
2673 /* we put an undefined size for struct/union */
2674 s
= sym_push(v
| SYM_STRUCT
, &type1
, 0, -1);
2675 s
->r
= 0; /* default alignment is zero as gcc */
2676 /* put struct/union/enum name in type */
2684 tcc_error("struct/union/enum already defined");
2685 /* cannot be empty */
2687 /* non empty enums are not allowed */
2688 if (a
== TOK_ENUM
) {
2692 expect("identifier");
2698 /* enum symbols have static storage */
2699 ss
= sym_push(v
, &int_type
, VT_CONST
, c
);
2700 ss
->type
.t
|= VT_STATIC
;
2705 /* NOTE: we accept a trailing comma */
2716 while (tok
!= '}') {
2717 parse_btype(&btype
, &ad
);
2723 type_decl(&type1
, &ad
, &v
, TYPE_DIRECT
| TYPE_ABSTRACT
);
2724 if (v
== 0 && (type1
.t
& VT_BTYPE
) != VT_STRUCT
)
2725 expect("identifier");
2726 if ((type1
.t
& VT_BTYPE
) == VT_FUNC
||
2727 (type1
.t
& (VT_TYPEDEF
| VT_STATIC
| VT_EXTERN
| VT_INLINE
)))
2728 tcc_error("invalid type for '%s'",
2729 get_tok_str(v
, NULL
));
2733 bit_size
= expr_const();
2734 /* XXX: handle v = 0 case for messages */
2736 tcc_error("negative width in bit-field '%s'",
2737 get_tok_str(v
, NULL
));
2738 if (v
&& bit_size
== 0)
2739 tcc_error("zero width for bit-field '%s'",
2740 get_tok_str(v
, NULL
));
2742 size
= type_size(&type1
, &align
);
2744 if (align
< ad
.aligned
)
2746 } else if (ad
.packed
) {
2748 } else if (*tcc_state
->pack_stack_ptr
) {
2749 if (align
> *tcc_state
->pack_stack_ptr
)
2750 align
= *tcc_state
->pack_stack_ptr
;
2753 if (bit_size
>= 0) {
2754 bt
= type1
.t
& VT_BTYPE
;
2761 tcc_error("bitfields must have scalar type");
2763 if (bit_size
> bsize
) {
2764 tcc_error("width of '%s' exceeds its type",
2765 get_tok_str(v
, NULL
));
2766 } else if (bit_size
== bsize
) {
2767 /* no need for bit fields */
2769 } else if (bit_size
== 0) {
2770 /* XXX: what to do if only padding in a
2772 /* zero size: means to pad */
2775 /* we do not have enough room ?
2776 did the type change?
2778 if ((bit_pos
+ bit_size
) > bsize
||
2779 bt
!= prevbt
|| a
== TOK_UNION
)
2782 /* XXX: handle LSB first */
2783 type1
.t
|= VT_BITFIELD
|
2784 (bit_pos
<< VT_STRUCT_SHIFT
) |
2785 (bit_size
<< (VT_STRUCT_SHIFT
+ 6));
2786 bit_pos
+= bit_size
;
2792 if (v
!= 0 || (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
2793 /* add new memory data only if starting
2795 if (lbit_pos
== 0) {
2796 if (a
== TOK_STRUCT
) {
2797 c
= (c
+ align
- 1) & -align
;
2806 if (align
> maxalign
)
2810 printf("add field %s offset=%d",
2811 get_tok_str(v
, NULL
), offset
);
2812 if (type1
.t
& VT_BITFIELD
) {
2813 printf(" pos=%d size=%d",
2814 (type1
.t
>> VT_STRUCT_SHIFT
) & 0x3f,
2815 (type1
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f);
2820 if (v
== 0 && (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
2822 while ((ass
= ass
->next
) != NULL
) {
2823 ss
= sym_push(ass
->v
, &ass
->type
, 0, offset
+ ass
->c
);
2828 ss
= sym_push(v
| SYM_FIELD
, &type1
, 0, offset
);
2832 if (tok
== ';' || tok
== TOK_EOF
)
2839 /* store size and alignment */
2840 s
->c
= (c
+ maxalign
- 1) & -maxalign
;
2846 /* return 0 if no type declaration. otherwise, return the basic type
2849 static int parse_btype(CType
*type
, AttributeDef
*ad
)
2851 int t
, u
, type_found
, typespec_found
, typedef_found
;
2855 memset(ad
, 0, sizeof(AttributeDef
));
2863 /* currently, we really ignore extension */
2873 if ((t
& VT_BTYPE
) != 0)
2874 tcc_error("too many basic types");
2890 if ((t
& VT_BTYPE
) == VT_DOUBLE
) {
2891 #ifndef TCC_TARGET_PE
2892 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
2894 } else if ((t
& VT_BTYPE
) == VT_LONG
) {
2895 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
2909 if ((t
& VT_BTYPE
) == VT_LONG
) {
2910 #ifdef TCC_TARGET_PE
2911 t
= (t
& ~VT_BTYPE
) | VT_DOUBLE
;
2913 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
2921 struct_decl(&type1
, VT_ENUM
);
2924 type
->ref
= type1
.ref
;
2928 struct_decl(&type1
, VT_STRUCT
);
2931 /* type modifiers */
2984 /* GNUC attribute */
2985 case TOK_ATTRIBUTE1
:
2986 case TOK_ATTRIBUTE2
:
2987 parse_attribute(ad
);
2990 t
= (t
& ~VT_BTYPE
) | u
;
2998 parse_expr_type(&type1
);
2999 /* remove all storage modifiers except typedef */
3000 type1
.t
&= ~(VT_STORAGE
&~VT_TYPEDEF
);
3003 if (typespec_found
|| typedef_found
)
3006 if (!s
|| !(s
->type
.t
& VT_TYPEDEF
))
3009 t
|= (s
->type
.t
& ~VT_TYPEDEF
);
3010 type
->ref
= s
->type
.ref
;
3012 /* get attributes from typedef */
3013 if (0 == ad
->aligned
)
3014 ad
->aligned
= FUNC_ALIGN(s
->r
);
3015 if (0 == ad
->func_call
)
3016 ad
->func_call
= FUNC_CALL(s
->r
);
3017 ad
->packed
|= FUNC_PACKED(s
->r
);
3026 if ((t
& (VT_SIGNED
|VT_UNSIGNED
)) == (VT_SIGNED
|VT_UNSIGNED
))
3027 tcc_error("signed and unsigned modifier");
3028 if (tcc_state
->char_is_unsigned
) {
3029 if ((t
& (VT_SIGNED
|VT_UNSIGNED
|VT_BTYPE
)) == VT_BYTE
)
3034 /* long is never used as type */
3035 if ((t
& VT_BTYPE
) == VT_LONG
)
3036 #if !defined TCC_TARGET_X86_64 || defined TCC_TARGET_PE
3037 t
= (t
& ~VT_BTYPE
) | VT_INT
;
3039 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3045 /* convert a function parameter type (array to pointer and function to
3046 function pointer) */
3047 static inline void convert_parameter_type(CType
*pt
)
3049 /* remove const and volatile qualifiers (XXX: const could be used
3050 to indicate a const function parameter */
3051 pt
->t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3052 /* array must be transformed to pointer according to ANSI C */
3054 if ((pt
->t
& VT_BTYPE
) == VT_FUNC
) {
3059 ST_FUNC
void parse_asm_str(CString
*astr
)
3062 /* read the string */
3064 expect("string constant");
3066 while (tok
== TOK_STR
) {
3067 /* XXX: add \0 handling too ? */
3068 cstr_cat(astr
, tokc
.cstr
->data
);
3071 cstr_ccat(astr
, '\0');
3074 /* Parse an asm label and return the label
3075 * Don't forget to free the CString in the caller! */
3076 static void asm_label_instr(CString
*astr
)
3079 parse_asm_str(astr
);
3082 printf("asm_alias: \"%s\"\n", (char *)astr
->data
);
3086 static void post_type(CType
*type
, AttributeDef
*ad
)
3088 int n
, l
, t1
, arg_size
, align
;
3089 Sym
**plast
, *s
, *first
;
3094 /* function declaration */
3102 /* read param name and compute offset */
3103 if (l
!= FUNC_OLD
) {
3104 if (!parse_btype(&pt
, &ad1
)) {
3106 tcc_error("invalid type");
3113 if ((pt
.t
& VT_BTYPE
) == VT_VOID
&& tok
== ')')
3115 type_decl(&pt
, &ad1
, &n
, TYPE_DIRECT
| TYPE_ABSTRACT
);
3116 if ((pt
.t
& VT_BTYPE
) == VT_VOID
)
3117 tcc_error("parameter declared as void");
3118 arg_size
+= (type_size(&pt
, &align
) + PTR_SIZE
- 1) / PTR_SIZE
;
3123 expect("identifier");
3127 convert_parameter_type(&pt
);
3128 s
= sym_push(n
| SYM_FIELD
, &pt
, 0, 0);
3134 if (l
== FUNC_NEW
&& tok
== TOK_DOTS
) {
3141 /* if no parameters, then old type prototype */
3145 /* NOTE: const is ignored in returned type as it has a special
3146 meaning in gcc / C++ */
3147 type
->t
&= ~VT_CONSTANT
;
3148 /* some ancient pre-K&R C allows a function to return an array
3149 and the array brackets to be put after the arguments, such
3150 that "int c()[]" means something like "int[] c()" */
3153 skip(']'); /* only handle simple "[]" */
3156 /* we push a anonymous symbol which will contain the function prototype */
3157 ad
->func_args
= arg_size
;
3158 s
= sym_push(SYM_FIELD
, type
, INT_ATTR(ad
), l
);
3162 } else if (tok
== '[') {
3163 /* array definition */
3165 if (tok
== TOK_RESTRICT1
)
3170 if (!local_stack
|| nocode_wanted
)
3171 vpushi(expr_const());
3173 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3176 tcc_error("invalid array size");
3178 if (!is_integer_btype(vtop
->type
.t
& VT_BTYPE
))
3179 tcc_error("size of variable length array should be an integer");
3184 /* parse next post type */
3185 post_type(type
, ad
);
3186 t1
|= type
->t
& VT_VLA
;
3189 loc
-= type_size(&int_type
, &align
);
3193 vla_runtime_type_size(type
, &align
);
3195 vset(&int_type
, VT_LOCAL
|VT_LVAL
, loc
);
3202 /* we push an anonymous symbol which will contain the array
3204 s
= sym_push(SYM_FIELD
, type
, 0, n
);
3205 type
->t
= (t1
? VT_VLA
: VT_ARRAY
) | VT_PTR
;
3210 /* Parse a type declaration (except basic type), and return the type
3211 in 'type'. 'td' is a bitmask indicating which kind of type decl is
3212 expected. 'type' should contain the basic type. 'ad' is the
3213 attribute definition of the basic type. It can be modified by
3216 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
)
3219 CType type1
, *type2
;
3220 int qualifiers
, storage
;
3222 while (tok
== '*') {
3230 qualifiers
|= VT_CONSTANT
;
3235 qualifiers
|= VT_VOLATILE
;
3243 type
->t
|= qualifiers
;
3246 /* XXX: clarify attribute handling */
3247 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3248 parse_attribute(ad
);
3250 /* recursive type */
3251 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
3252 type1
.t
= 0; /* XXX: same as int */
3255 /* XXX: this is not correct to modify 'ad' at this point, but
3256 the syntax is not clear */
3257 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3258 parse_attribute(ad
);
3259 type_decl(&type1
, ad
, v
, td
);
3262 /* type identifier */
3263 if (tok
>= TOK_IDENT
&& (td
& TYPE_DIRECT
)) {
3267 if (!(td
& TYPE_ABSTRACT
))
3268 expect("identifier");
3272 storage
= type
->t
& VT_STORAGE
;
3273 type
->t
&= ~VT_STORAGE
;
3274 post_type(type
, ad
);
3276 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3277 parse_attribute(ad
);
3281 /* append type at the end of type1 */
3294 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
3295 ST_FUNC
int lvalue_type(int t
)
3300 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
3302 else if (bt
== VT_SHORT
)
3306 if (t
& VT_UNSIGNED
)
3307 r
|= VT_LVAL_UNSIGNED
;
3311 /* indirection with full error checking and bound check */
3312 ST_FUNC
void indir(void)
3314 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
) {
3315 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FUNC
)
3319 if ((vtop
->r
& VT_LVAL
) && !nocode_wanted
)
3321 vtop
->type
= *pointed_type(&vtop
->type
);
3322 /* Arrays and functions are never lvalues */
3323 if (!(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_VLA
)
3324 && (vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
3325 vtop
->r
|= lvalue_type(vtop
->type
.t
);
3326 /* if bound checking, the referenced pointer must be checked */
3327 #ifdef CONFIG_TCC_BCHECK
3328 if (tcc_state
->do_bounds_check
)
3329 vtop
->r
|= VT_MUSTBOUND
;
3334 /* pass a parameter to a function and do type checking and casting */
3335 static void gfunc_param_typed(Sym
*func
, Sym
*arg
)
3340 func_type
= func
->c
;
3341 if (func_type
== FUNC_OLD
||
3342 (func_type
== FUNC_ELLIPSIS
&& arg
== NULL
)) {
3343 /* default casting : only need to convert float to double */
3344 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
) {
3348 } else if (arg
== NULL
) {
3349 tcc_error("too many arguments to function");
3352 type
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
3353 gen_assign_cast(&type
);
3357 /* parse an expression of the form '(type)' or '(expr)' and return its
3359 static void parse_expr_type(CType
*type
)
3365 if (parse_btype(type
, &ad
)) {
3366 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3373 static void parse_type(CType
*type
)
3378 if (!parse_btype(type
, &ad
)) {
3381 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3384 static void vpush_tokc(int t
)
3389 vsetc(&type
, VT_CONST
, &tokc
);
3392 ST_FUNC
void unary(void)
3394 int n
, t
, align
, size
, r
, sizeof_caller
;
3398 static int in_sizeof
= 0;
3400 sizeof_caller
= in_sizeof
;
3402 /* XXX: GCC 2.95.3 does not generate a table although it should be
3416 vpush_tokc(VT_INT
| VT_UNSIGNED
);
3420 vpush_tokc(VT_LLONG
);
3424 vpush_tokc(VT_LLONG
| VT_UNSIGNED
);
3428 vpush_tokc(VT_FLOAT
);
3432 vpush_tokc(VT_DOUBLE
);
3436 vpush_tokc(VT_LDOUBLE
);
3439 case TOK___FUNCTION__
:
3441 goto tok_identifier
;
3447 /* special function name identifier */
3448 len
= strlen(funcname
) + 1;
3449 /* generate char[len] type */
3454 vpush_ref(&type
, data_section
, data_section
->data_offset
, len
);
3455 ptr
= section_ptr_add(data_section
, len
);
3456 memcpy(ptr
, funcname
, len
);
3461 #ifdef TCC_TARGET_PE
3462 t
= VT_SHORT
| VT_UNSIGNED
;
3468 /* string parsing */
3471 if (tcc_state
->warn_write_strings
)
3476 memset(&ad
, 0, sizeof(AttributeDef
));
3477 decl_initializer_alloc(&type
, &ad
, VT_CONST
, 2, 0, NULL
, 0);
3482 if (parse_btype(&type
, &ad
)) {
3483 type_decl(&type
, &ad
, &n
, TYPE_ABSTRACT
);
3485 /* check ISOC99 compound literal */
3487 /* data is allocated locally by default */
3492 /* all except arrays are lvalues */
3493 if (!(type
.t
& VT_ARRAY
))
3494 r
|= lvalue_type(type
.t
);
3495 memset(&ad
, 0, sizeof(AttributeDef
));
3496 decl_initializer_alloc(&type
, &ad
, r
, 1, 0, NULL
, 0);
3498 if (sizeof_caller
) {
3505 } else if (tok
== '{') {
3506 /* save all registers */
3508 /* statement expression : we do not accept break/continue
3509 inside as GCC does */
3510 block(NULL
, NULL
, NULL
, NULL
, 0, 1);
3525 /* functions names must be treated as function pointers,
3526 except for unary '&' and sizeof. Since we consider that
3527 functions are not lvalues, we only have to handle it
3528 there and in function calls. */
3529 /* arrays can also be used although they are not lvalues */
3530 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
&&
3531 !(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_LLOCAL
))
3533 mk_pointer(&vtop
->type
);
3539 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3541 boolean
.t
= VT_BOOL
;
3543 vtop
->c
.i
= !vtop
->c
.i
;
3544 } else if ((vtop
->r
& VT_VALMASK
) == VT_CMP
)
3545 vtop
->c
.i
= vtop
->c
.i
^ 1;
3548 vseti(VT_JMP
, gtst(1, 0));
3559 /* in order to force cast, we add zero */
3561 if ((vtop
->type
.t
& VT_BTYPE
) == VT_PTR
)
3562 tcc_error("pointer not accepted for unary plus");
3572 unary_type(&type
); // Perform a in_sizeof = 0;
3573 size
= type_size(&type
, &align
);
3574 if (t
== TOK_SIZEOF
) {
3575 if (!(type
.t
& VT_VLA
)) {
3577 tcc_error("sizeof applied to an incomplete type");
3580 vla_runtime_type_size(&type
, &align
);
3585 vtop
->type
.t
|= VT_UNSIGNED
;
3588 case TOK_builtin_types_compatible_p
:
3597 type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3598 type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3599 vpushi(is_compatible_types(&type1
, &type2
));
3602 case TOK_builtin_constant_p
:
3604 int saved_nocode_wanted
, res
;
3607 saved_nocode_wanted
= nocode_wanted
;
3610 res
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
3612 nocode_wanted
= saved_nocode_wanted
;
3617 case TOK_builtin_frame_address
:
3622 if (tok
!= TOK_CINT
) {
3623 tcc_error("__builtin_frame_address only takes integers");
3626 tcc_error("TCC only supports __builtin_frame_address(0)");
3632 vset(&type
, VT_LOCAL
, 0);
3635 #ifdef TCC_TARGET_X86_64
3636 case TOK_builtin_va_arg_types
:
3638 /* This definition must be synced with stdarg.h */
3639 enum __va_arg_type
{
3640 __va_gen_reg
, __va_float_reg
, __va_stack
3648 bt
= type
.t
& VT_BTYPE
;
3649 if (bt
== VT_STRUCT
|| bt
== VT_LDOUBLE
) {
3651 } else if (bt
== VT_FLOAT
|| bt
== VT_DOUBLE
) {
3652 vpushi(__va_float_reg
);
3654 vpushi(__va_gen_reg
);
3674 goto tok_identifier
;
3676 /* allow to take the address of a label */
3677 if (tok
< TOK_UIDENT
)
3678 expect("label identifier");
3679 s
= label_find(tok
);
3681 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
3683 if (s
->r
== LABEL_DECLARED
)
3684 s
->r
= LABEL_FORWARD
;
3687 s
->type
.t
= VT_VOID
;
3688 mk_pointer(&s
->type
);
3689 s
->type
.t
|= VT_STATIC
;
3691 vset(&s
->type
, VT_CONST
| VT_SYM
, 0);
3696 // special qnan , snan and infinity values
3698 vpush64(VT_DOUBLE
, 0x7ff8000000000000ULL
);
3702 vpush64(VT_DOUBLE
, 0x7ff0000000000001ULL
);
3706 vpush64(VT_DOUBLE
, 0x7ff0000000000000ULL
);
3715 expect("identifier");
3719 tcc_error("'%s' undeclared", get_tok_str(t
, NULL
));
3720 /* for simple function calls, we tolerate undeclared
3721 external reference to int() function */
3722 if (tcc_state
->warn_implicit_function_declaration
)
3723 tcc_warning("implicit declaration of function '%s'",
3724 get_tok_str(t
, NULL
));
3725 s
= external_global_sym(t
, &func_old_type
, 0);
3727 if ((s
->type
.t
& (VT_STATIC
| VT_INLINE
| VT_BTYPE
)) ==
3728 (VT_STATIC
| VT_INLINE
| VT_FUNC
)) {
3729 /* if referencing an inline function, then we generate a
3730 symbol to it if not already done. It will have the
3731 effect to generate code for it at the end of the
3732 compilation unit. Inline function as always
3733 generated in the text section. */
3735 put_extern_sym(s
, text_section
, 0, 0);
3736 r
= VT_SYM
| VT_CONST
;
3740 vset(&s
->type
, r
, s
->c
);
3741 /* if forward reference, we must point to s */
3742 if (vtop
->r
& VT_SYM
) {
3749 /* post operations */
3751 if (tok
== TOK_INC
|| tok
== TOK_DEC
) {
3754 } else if (tok
== '.' || tok
== TOK_ARROW
) {
3757 if (tok
== TOK_ARROW
)
3759 qualifiers
= vtop
->type
.t
& (VT_CONSTANT
| VT_VOLATILE
);
3763 /* expect pointer on structure */
3764 if ((vtop
->type
.t
& VT_BTYPE
) != VT_STRUCT
)
3765 expect("struct or union");
3769 while ((s
= s
->next
) != NULL
) {
3774 tcc_error("field not found: %s", get_tok_str(tok
& ~SYM_FIELD
, NULL
));
3775 /* add field offset to pointer */
3776 vtop
->type
= char_pointer_type
; /* change type to 'char *' */
3779 /* change type to field type, and set to lvalue */
3780 vtop
->type
= s
->type
;
3781 vtop
->type
.t
|= qualifiers
;
3782 /* an array is never an lvalue */
3783 if (!(vtop
->type
.t
& VT_ARRAY
)) {
3784 vtop
->r
|= lvalue_type(vtop
->type
.t
);
3785 #ifdef CONFIG_TCC_BCHECK
3786 /* if bound checking, the referenced pointer must be checked */
3787 if (tcc_state
->do_bounds_check
)
3788 vtop
->r
|= VT_MUSTBOUND
;
3792 } else if (tok
== '[') {
3798 } else if (tok
== '(') {
3804 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
3805 /* pointer test (no array accepted) */
3806 if ((vtop
->type
.t
& (VT_BTYPE
| VT_ARRAY
)) == VT_PTR
) {
3807 vtop
->type
= *pointed_type(&vtop
->type
);
3808 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
)
3812 expect("function pointer");
3815 vtop
->r
&= ~VT_LVAL
; /* no lvalue */
3817 /* get return type */
3820 sa
= s
->next
; /* first parameter */
3823 /* compute first implicit argument if a structure is returned */
3824 if ((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
3825 /* get some space for the returned structure */
3826 size
= type_size(&s
->type
, &align
);
3827 loc
= (loc
- size
) & -align
;
3829 ret
.r
= VT_LOCAL
| VT_LVAL
;
3830 /* pass it as 'int' to avoid structure arg passing
3832 vseti(VT_LOCAL
, loc
);
3837 /* return in register */
3838 if (is_float(ret
.type
.t
)) {
3839 ret
.r
= reg_fret(ret
.type
.t
);
3841 if ((ret
.type
.t
& VT_BTYPE
) == VT_LLONG
)
3850 gfunc_param_typed(s
, sa
);
3860 tcc_error("too few arguments to function");
3862 if (!nocode_wanted
) {
3863 gfunc_call(nb_args
);
3865 vtop
-= (nb_args
+ 1);
3868 vsetc(&ret
.type
, ret
.r
, &ret
.c
);
3876 ST_FUNC
void expr_prod(void)
3881 while (tok
== '*' || tok
== '/' || tok
== '%') {
3889 ST_FUNC
void expr_sum(void)
3894 while (tok
== '+' || tok
== '-') {
3902 static void expr_shift(void)
3907 while (tok
== TOK_SHL
|| tok
== TOK_SAR
) {
3915 static void expr_cmp(void)
3920 while ((tok
>= TOK_ULE
&& tok
<= TOK_GT
) ||
3921 tok
== TOK_ULT
|| tok
== TOK_UGE
) {
3929 static void expr_cmpeq(void)
3934 while (tok
== TOK_EQ
|| tok
== TOK_NE
) {
3942 static void expr_and(void)
3945 while (tok
== '&') {
3952 static void expr_xor(void)
3955 while (tok
== '^') {
3962 static void expr_or(void)
3965 while (tok
== '|') {
3972 /* XXX: fix this mess */
3973 static void expr_land_const(void)
3976 while (tok
== TOK_LAND
) {
3983 /* XXX: fix this mess */
3984 static void expr_lor_const(void)
3987 while (tok
== TOK_LOR
) {
3994 /* only used if non constant */
3995 static void expr_land(void)
4000 if (tok
== TOK_LAND
) {
4005 if (tok
!= TOK_LAND
) {
4015 static void expr_lor(void)
4020 if (tok
== TOK_LOR
) {
4025 if (tok
!= TOK_LOR
) {
4035 /* XXX: better constant handling */
4036 static void expr_cond(void)
4038 int tt
, u
, r1
, r2
, rc
, t1
, t2
, bt1
, bt2
;
4040 CType type
, type1
, type2
;
4047 boolean
.t
= VT_BOOL
;
4053 if (tok
!= ':' || !gnu_ext
) {
4068 if (vtop
!= vstack
) {
4069 /* needed to avoid having different registers saved in
4071 if (is_float(vtop
->type
.t
)) {
4073 #ifdef TCC_TARGET_X86_64
4074 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4084 if (tok
== ':' && gnu_ext
) {
4092 sv
= *vtop
; /* save value to handle it later */
4093 vtop
--; /* no vpop so that FP stack is not flushed */
4101 bt1
= t1
& VT_BTYPE
;
4103 bt2
= t2
& VT_BTYPE
;
4104 /* cast operands to correct type according to ISOC rules */
4105 if (is_float(bt1
) || is_float(bt2
)) {
4106 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
4107 type
.t
= VT_LDOUBLE
;
4108 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
4113 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
4114 /* cast to biggest op */
4116 /* convert to unsigned if it does not fit in a long long */
4117 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
4118 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
4119 type
.t
|= VT_UNSIGNED
;
4120 } else if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
4121 /* If one is a null ptr constant the result type
4123 if (is_null_pointer (vtop
))
4125 else if (is_null_pointer (&sv
))
4127 /* XXX: test pointer compatibility, C99 has more elaborate
4131 } else if (bt1
== VT_FUNC
|| bt2
== VT_FUNC
) {
4132 /* XXX: test function pointer compatibility */
4133 type
= bt1
== VT_FUNC
? type1
: type2
;
4134 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
4135 /* XXX: test structure compatibility */
4136 type
= bt1
== VT_STRUCT
? type1
: type2
;
4137 } else if (bt1
== VT_VOID
|| bt2
== VT_VOID
) {
4138 /* NOTE: as an extension, we accept void on only one side */
4141 /* integer operations */
4143 /* convert to unsigned if it does not fit in an integer */
4144 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
4145 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
4146 type
.t
|= VT_UNSIGNED
;
4149 /* now we convert second operand */
4151 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4154 if (is_float(type
.t
)) {
4156 #ifdef TCC_TARGET_X86_64
4157 if ((type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4161 } else if ((type
.t
& VT_BTYPE
) == VT_LLONG
) {
4162 /* for long longs, we use fixed registers to avoid having
4163 to handle a complicated move */
4168 /* this is horrible, but we must also convert first
4172 /* put again first value and cast it */
4175 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4185 static void expr_eq(void)
4191 (tok
>= TOK_A_MOD
&& tok
<= TOK_A_DIV
) ||
4192 tok
== TOK_A_XOR
|| tok
== TOK_A_OR
||
4193 tok
== TOK_A_SHL
|| tok
== TOK_A_SAR
) {
4208 ST_FUNC
void gexpr(void)
4219 /* parse an expression and return its type without any side effect. */
4220 static void expr_type(CType
*type
)
4222 int saved_nocode_wanted
;
4224 saved_nocode_wanted
= nocode_wanted
;
4229 nocode_wanted
= saved_nocode_wanted
;
4232 /* parse a unary expression and return its type without any side
4234 static void unary_type(CType
*type
)
4246 /* parse a constant expression and return value in vtop. */
4247 static void expr_const1(void)
4256 /* parse an integer constant and return its value. */
4257 ST_FUNC
int expr_const(void)
4261 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
4262 expect("constant expression");
4268 /* return the label token if current token is a label, otherwise
4270 static int is_label(void)
4274 /* fast test first */
4275 if (tok
< TOK_UIDENT
)
4277 /* no need to save tokc because tok is an identifier */
4284 unget_tok(last_tok
);
4289 static void block(int *bsym
, int *csym
, int *case_sym
, int *def_sym
,
4290 int case_reg
, int is_expr
)
4295 /* generate line number info */
4296 if (tcc_state
->do_debug
&&
4297 (last_line_num
!= file
->line_num
|| last_ind
!= ind
)) {
4298 put_stabn(N_SLINE
, 0, file
->line_num
, ind
- func_ind
);
4300 last_line_num
= file
->line_num
;
4304 /* default return value is (void) */
4306 vtop
->type
.t
= VT_VOID
;
4309 if (tok
== TOK_IF
) {
4316 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4318 if (c
== TOK_ELSE
) {
4322 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4323 gsym(d
); /* patch else jmp */
4326 } else if (tok
== TOK_WHILE
) {
4334 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4338 } else if (tok
== '{') {
4342 /* record local declaration stack position */
4344 llabel
= local_label_stack
;
4345 /* handle local labels declarations */
4346 if (tok
== TOK_LABEL
) {
4349 if (tok
< TOK_UIDENT
)
4350 expect("label identifier");
4351 label_push(&local_label_stack
, tok
, LABEL_DECLARED
);
4361 while (tok
!= '}') {
4366 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
4369 /* pop locally defined labels */
4370 label_pop(&local_label_stack
, llabel
);
4372 /* XXX: this solution makes only valgrind happy...
4373 triggered by gcc.c-torture/execute/20000917-1.c */
4375 switch(vtop
->type
.t
& VT_BTYPE
) {
4380 for(p
=vtop
->type
.ref
;p
;p
=p
->prev
)
4382 tcc_error("unsupported expression type");
4385 /* pop locally defined symbols */
4386 sym_pop(&local_stack
, s
);
4388 } else if (tok
== TOK_RETURN
) {
4392 gen_assign_cast(&func_vt
);
4393 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
4395 /* if returning structure, must copy it to implicit
4396 first pointer arg location */
4399 size
= type_size(&func_vt
,&align
);
4402 if((vtop
->r
!= (VT_LOCAL
| VT_LVAL
) || (vtop
->c
.i
& 3))
4406 loc
= (loc
- size
) & -4;
4409 vset(&type
, VT_LOCAL
| VT_LVAL
, addr
);
4412 vset(&int_type
, VT_LOCAL
| VT_LVAL
, addr
);
4414 vtop
->type
= int_type
;
4420 vset(&type
, VT_LOCAL
| VT_LVAL
, func_vc
);
4423 /* copy structure value to pointer */
4428 } else if (is_float(func_vt
.t
)) {
4429 gv(rc_fret(func_vt
.t
));
4433 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
4436 rsym
= gjmp(rsym
); /* jmp */
4437 } else if (tok
== TOK_BREAK
) {
4440 tcc_error("cannot break");
4441 *bsym
= gjmp(*bsym
);
4444 } else if (tok
== TOK_CONTINUE
) {
4447 tcc_error("cannot continue");
4448 *csym
= gjmp(*csym
);
4451 } else if (tok
== TOK_FOR
) {
4457 /* c99 for-loop init decl? */
4458 if (!decl0(VT_LOCAL
, 1)) {
4459 /* no, regular for-loop init expr */
4483 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4487 sym_pop(&local_stack
, s
);
4489 if (tok
== TOK_DO
) {
4494 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4505 if (tok
== TOK_SWITCH
) {
4509 /* XXX: other types than integer */
4510 case_reg
= gv(RC_INT
);
4514 b
= gjmp(0); /* jump to first case */
4516 block(&a
, csym
, &b
, &c
, case_reg
, 0);
4517 /* if no default, jmp after switch */
4525 if (tok
== TOK_CASE
) {
4532 if (gnu_ext
&& tok
== TOK_DOTS
) {
4536 tcc_warning("empty case range");
4538 /* since a case is like a label, we must skip it with a jmp */
4545 *case_sym
= gtst(1, 0);
4548 *case_sym
= gtst(1, 0);
4552 *case_sym
= gtst(1, *case_sym
);
4557 goto block_after_label
;
4559 if (tok
== TOK_DEFAULT
) {
4565 tcc_error("too many 'default'");
4568 goto block_after_label
;
4570 if (tok
== TOK_GOTO
) {
4572 if (tok
== '*' && gnu_ext
) {
4576 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
)
4579 } else if (tok
>= TOK_UIDENT
) {
4580 s
= label_find(tok
);
4581 /* put forward definition if needed */
4583 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
4585 if (s
->r
== LABEL_DECLARED
)
4586 s
->r
= LABEL_FORWARD
;
4588 /* label already defined */
4589 if (s
->r
& LABEL_FORWARD
)
4590 s
->jnext
= gjmp(s
->jnext
);
4592 gjmp_addr(s
->jnext
);
4595 expect("label identifier");
4598 } else if (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
) {
4606 if (s
->r
== LABEL_DEFINED
)
4607 tcc_error("duplicate label '%s'", get_tok_str(s
->v
, NULL
));
4609 s
->r
= LABEL_DEFINED
;
4611 s
= label_push(&global_label_stack
, b
, LABEL_DEFINED
);
4614 /* we accept this, but it is a mistake */
4617 tcc_warning("deprecated use of label at end of compound statement");
4621 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
4624 /* expression case */
4639 /* t is the array or struct type. c is the array or struct
4640 address. cur_index/cur_field is the pointer to the current
4641 value. 'size_only' is true if only size info is needed (only used
4643 static void decl_designator(CType
*type
, Section
*sec
, unsigned long c
,
4644 int *cur_index
, Sym
**cur_field
,
4648 int notfirst
, index
, index_last
, align
, l
, nb_elems
, elem_size
;
4654 if (gnu_ext
&& (l
= is_label()) != 0)
4656 while (tok
== '[' || tok
== '.') {
4658 if (!(type
->t
& VT_ARRAY
))
4659 expect("array type");
4662 index
= expr_const();
4663 if (index
< 0 || (s
->c
>= 0 && index
>= s
->c
))
4664 expect("invalid index");
4665 if (tok
== TOK_DOTS
&& gnu_ext
) {
4667 index_last
= expr_const();
4668 if (index_last
< 0 ||
4669 (s
->c
>= 0 && index_last
>= s
->c
) ||
4671 expect("invalid index");
4677 *cur_index
= index_last
;
4678 type
= pointed_type(type
);
4679 elem_size
= type_size(type
, &align
);
4680 c
+= index
* elem_size
;
4681 /* NOTE: we only support ranges for last designator */
4682 nb_elems
= index_last
- index
+ 1;
4683 if (nb_elems
!= 1) {
4692 if ((type
->t
& VT_BTYPE
) != VT_STRUCT
)
4693 expect("struct/union type");
4706 /* XXX: fix this mess by using explicit storage field */
4708 type1
.t
|= (type
->t
& ~VT_TYPE
);
4722 if (type
->t
& VT_ARRAY
) {
4724 type
= pointed_type(type
);
4725 c
+= index
* type_size(type
, &align
);
4729 tcc_error("too many field init");
4730 /* XXX: fix this mess by using explicit storage field */
4732 type1
.t
|= (type
->t
& ~VT_TYPE
);
4737 decl_initializer(type
, sec
, c
, 0, size_only
);
4739 /* XXX: make it more general */
4740 if (!size_only
&& nb_elems
> 1) {
4741 unsigned long c_end
;
4746 tcc_error("range init not supported yet for dynamic storage");
4747 c_end
= c
+ nb_elems
* elem_size
;
4748 if (c_end
> sec
->data_allocated
)
4749 section_realloc(sec
, c_end
);
4750 src
= sec
->data
+ c
;
4752 for(i
= 1; i
< nb_elems
; i
++) {
4754 memcpy(dst
, src
, elem_size
);
4760 #define EXPR_CONST 1
4763 /* store a value or an expression directly in global data or in local array */
4764 static void init_putv(CType
*type
, Section
*sec
, unsigned long c
,
4765 int v
, int expr_type
)
4767 int saved_global_expr
, bt
, bit_pos
, bit_size
;
4769 unsigned long long bit_mask
;
4777 /* compound literals must be allocated globally in this case */
4778 saved_global_expr
= global_expr
;
4781 global_expr
= saved_global_expr
;
4782 /* NOTE: symbols are accepted */
4783 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) != VT_CONST
)
4784 tcc_error("initializer element is not constant");
4792 dtype
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
4795 /* XXX: not portable */
4796 /* XXX: generate error if incorrect relocation */
4797 gen_assign_cast(&dtype
);
4798 bt
= type
->t
& VT_BTYPE
;
4799 /* we'll write at most 12 bytes */
4800 if (c
+ 12 > sec
->data_allocated
) {
4801 section_realloc(sec
, c
+ 12);
4803 ptr
= sec
->data
+ c
;
4804 /* XXX: make code faster ? */
4805 if (!(type
->t
& VT_BITFIELD
)) {
4810 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
4811 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
4812 bit_mask
= (1LL << bit_size
) - 1;
4814 if ((vtop
->r
& VT_SYM
) &&
4820 (bt
== VT_INT
&& bit_size
!= 32)))
4821 tcc_error("initializer element is not computable at load time");
4824 vtop
->c
.i
= (vtop
->c
.i
!= 0);
4826 *(char *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
4829 *(short *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
4832 *(double *)ptr
= vtop
->c
.d
;
4835 *(long double *)ptr
= vtop
->c
.ld
;
4838 *(long long *)ptr
|= (vtop
->c
.ll
& bit_mask
) << bit_pos
;
4841 if (vtop
->r
& VT_SYM
) {
4842 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
4844 *(int *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
4849 vset(&dtype
, VT_LOCAL
|VT_LVAL
, c
);
4856 /* put zeros for variable based init */
4857 static void init_putz(CType
*t
, Section
*sec
, unsigned long c
, int size
)
4860 /* nothing to do because globals are already set to zero */
4862 vpush_global_sym(&func_old_type
, TOK_memset
);
4870 /* 't' contains the type and storage info. 'c' is the offset of the
4871 object in section 'sec'. If 'sec' is NULL, it means stack based
4872 allocation. 'first' is true if array '{' must be read (multi
4873 dimension implicit array init handling). 'size_only' is true if
4874 size only evaluation is wanted (only for arrays). */
4875 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
,
4876 int first
, int size_only
)
4878 int index
, array_length
, n
, no_oblock
, nb
, parlevel
, parlevel1
, i
;
4879 int size1
, align1
, expr_type
;
4883 if (type
->t
& VT_VLA
) {
4884 #if defined TCC_TARGET_I386 || defined TCC_TARGET_X86_64
4888 vpush_global_sym(&func_old_type
, TOK_alloca
);
4889 vla_runtime_type_size(type
, &a
);
4894 vsetc(type
, REG_IRET
, &retcval
);
4895 vset(type
, VT_LOCAL
|VT_LVAL
, c
);
4900 tcc_error("variable length arrays unsupported for this target");
4902 } else if (type
->t
& VT_ARRAY
) {
4906 t1
= pointed_type(type
);
4907 size1
= type_size(t1
, &align1
);
4910 if ((first
&& tok
!= TOK_LSTR
&& tok
!= TOK_STR
) ||
4913 tcc_error("character array initializer must be a literal,"
4914 " optionally enclosed in braces");
4919 /* only parse strings here if correct type (otherwise: handle
4920 them as ((w)char *) expressions */
4921 if ((tok
== TOK_LSTR
&&
4922 #ifdef TCC_TARGET_PE
4923 (t1
->t
& VT_BTYPE
) == VT_SHORT
&& (t1
->t
& VT_UNSIGNED
)
4925 (t1
->t
& VT_BTYPE
) == VT_INT
4927 ) || (tok
== TOK_STR
&& (t1
->t
& VT_BTYPE
) == VT_BYTE
)) {
4928 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
4933 /* compute maximum number of chars wanted */
4935 cstr_len
= cstr
->size
;
4937 cstr_len
= cstr
->size
/ sizeof(nwchar_t
);
4940 if (n
>= 0 && nb
> (n
- array_length
))
4941 nb
= n
- array_length
;
4944 tcc_warning("initializer-string for array is too long");
4945 /* in order to go faster for common case (char
4946 string in global variable, we handle it
4948 if (sec
&& tok
== TOK_STR
&& size1
== 1) {
4949 memcpy(sec
->data
+ c
+ array_length
, cstr
->data
, nb
);
4953 ch
= ((unsigned char *)cstr
->data
)[i
];
4955 ch
= ((nwchar_t
*)cstr
->data
)[i
];
4956 init_putv(t1
, sec
, c
+ (array_length
+ i
) * size1
,
4964 /* only add trailing zero if enough storage (no
4965 warning in this case since it is standard) */
4966 if (n
< 0 || array_length
< n
) {
4968 init_putv(t1
, sec
, c
+ (array_length
* size1
), 0, EXPR_VAL
);
4974 while (tok
!= '}') {
4975 decl_designator(type
, sec
, c
, &index
, NULL
, size_only
);
4976 if (n
>= 0 && index
>= n
)
4977 tcc_error("index too large");
4978 /* must put zero in holes (note that doing it that way
4979 ensures that it even works with designators) */
4980 if (!size_only
&& array_length
< index
) {
4981 init_putz(t1
, sec
, c
+ array_length
* size1
,
4982 (index
- array_length
) * size1
);
4985 if (index
> array_length
)
4986 array_length
= index
;
4987 /* special test for multi dimensional arrays (may not
4988 be strictly correct if designators are used at the
4990 if (index
>= n
&& no_oblock
)
4999 /* put zeros at the end */
5000 if (!size_only
&& n
>= 0 && array_length
< n
) {
5001 init_putz(t1
, sec
, c
+ array_length
* size1
,
5002 (n
- array_length
) * size1
);
5004 /* patch type size if needed */
5006 s
->c
= array_length
;
5007 } else if ((type
->t
& VT_BTYPE
) == VT_STRUCT
&&
5008 (sec
|| !first
|| tok
== '{')) {
5011 /* NOTE: the previous test is a specific case for automatic
5012 struct/union init */
5013 /* XXX: union needs only one init */
5015 /* XXX: this test is incorrect for local initializers
5016 beginning with ( without {. It would be much more difficult
5017 to do it correctly (ideally, the expression parser should
5018 be used in all cases) */
5024 while (tok
== '(') {
5028 if (!parse_btype(&type1
, &ad1
))
5030 type_decl(&type1
, &ad1
, &n
, TYPE_ABSTRACT
);
5032 if (!is_assignable_types(type
, &type1
))
5033 tcc_error("invalid type for cast");
5038 if (first
|| tok
== '{') {
5047 while (tok
!= '}') {
5048 decl_designator(type
, sec
, c
, NULL
, &f
, size_only
);
5050 if (!size_only
&& array_length
< index
) {
5051 init_putz(type
, sec
, c
+ array_length
,
5052 index
- array_length
);
5054 index
= index
+ type_size(&f
->type
, &align1
);
5055 if (index
> array_length
)
5056 array_length
= index
;
5058 /* gr: skip fields from same union - ugly. */
5060 ///printf("index: %2d %08x -- %2d %08x\n", f->c, f->type.t, f->next->c, f->next->type.t);
5061 /* test for same offset */
5062 if (f
->next
->c
!= f
->c
)
5064 /* if yes, test for bitfield shift */
5065 if ((f
->type
.t
& VT_BITFIELD
) && (f
->next
->type
.t
& VT_BITFIELD
)) {
5066 int bit_pos_1
= (f
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5067 int bit_pos_2
= (f
->next
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5068 //printf("bitfield %d %d\n", bit_pos_1, bit_pos_2);
5069 if (bit_pos_1
!= bit_pos_2
)
5076 if (no_oblock
&& f
== NULL
)
5082 /* put zeros at the end */
5083 if (!size_only
&& array_length
< n
) {
5084 init_putz(type
, sec
, c
+ array_length
,
5093 } else if (tok
== '{') {
5095 decl_initializer(type
, sec
, c
, first
, size_only
);
5097 } else if (size_only
) {
5098 /* just skip expression */
5099 parlevel
= parlevel1
= 0;
5100 while ((parlevel
> 0 || parlevel1
> 0 ||
5101 (tok
!= '}' && tok
!= ',')) && tok
!= -1) {
5104 else if (tok
== ')')
5106 else if (tok
== '{')
5108 else if (tok
== '}')
5113 /* currently, we always use constant expression for globals
5114 (may change for scripting case) */
5115 expr_type
= EXPR_CONST
;
5117 expr_type
= EXPR_ANY
;
5118 init_putv(type
, sec
, c
, 0, expr_type
);
5122 /* parse an initializer for type 't' if 'has_init' is non zero, and
5123 allocate space in local or global data space ('r' is either
5124 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
5125 variable 'v' with an associated name represented by 'asm_label' of
5126 scope 'scope' is declared before initializers are parsed. If 'v' is
5127 zero, then a reference to the new object is put in the value stack.
5128 If 'has_init' is 2, a special parsing is done to handle string
5130 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
,
5131 int has_init
, int v
, char *asm_label
,
5134 int size
, align
, addr
, data_offset
;
5136 ParseState saved_parse_state
= {0};
5137 TokenString init_str
;
5139 Sym
*flexible_array
;
5141 flexible_array
= NULL
;
5142 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
5145 while (field
&& field
->next
)
5146 field
= field
->next
;
5147 if (field
->type
.t
& VT_ARRAY
&& field
->type
.ref
->c
< 0)
5148 flexible_array
= field
;
5151 size
= type_size(type
, &align
);
5152 /* If unknown size, we must evaluate it before
5153 evaluating initializers because
5154 initializers can generate global data too
5155 (e.g. string pointers or ISOC99 compound
5156 literals). It also simplifies local
5157 initializers handling */
5158 tok_str_new(&init_str
);
5159 if (size
< 0 || (flexible_array
&& has_init
)) {
5161 tcc_error("unknown type size");
5162 /* get all init string */
5163 if (has_init
== 2) {
5164 /* only get strings */
5165 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5166 tok_str_add_tok(&init_str
);
5171 while (level
> 0 || (tok
!= ',' && tok
!= ';')) {
5173 tcc_error("unexpected end of file in initializer");
5174 tok_str_add_tok(&init_str
);
5177 else if (tok
== '}') {
5187 tok_str_add(&init_str
, -1);
5188 tok_str_add(&init_str
, 0);
5191 save_parse_state(&saved_parse_state
);
5193 macro_ptr
= init_str
.str
;
5195 decl_initializer(type
, NULL
, 0, 1, 1);
5196 /* prepare second initializer parsing */
5197 macro_ptr
= init_str
.str
;
5200 /* if still unknown size, error */
5201 size
= type_size(type
, &align
);
5203 tcc_error("unknown type size");
5206 size
+= flexible_array
->type
.ref
->c
* pointed_size(&flexible_array
->type
);
5207 /* take into account specified alignment if bigger */
5209 if (ad
->aligned
> align
)
5210 align
= ad
->aligned
;
5211 } else if (ad
->packed
) {
5214 if ((r
& VT_VALMASK
) == VT_LOCAL
) {
5216 #ifdef CONFIG_TCC_BCHECK
5217 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5221 loc
= (loc
- size
) & -align
;
5223 #ifdef CONFIG_TCC_BCHECK
5224 /* handles bounds */
5225 /* XXX: currently, since we do only one pass, we cannot track
5226 '&' operators, so we add only arrays */
5227 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5228 unsigned long *bounds_ptr
;
5229 /* add padding between regions */
5231 /* then add local bound info */
5232 bounds_ptr
= section_ptr_add(lbounds_section
, 2 * sizeof(unsigned long));
5233 bounds_ptr
[0] = addr
;
5234 bounds_ptr
[1] = size
;
5238 /* local variable */
5239 sym_push(v
, type
, r
, addr
);
5241 /* push local reference */
5242 vset(type
, r
, addr
);
5248 if (v
&& scope
== VT_CONST
) {
5249 /* see if the symbol was already defined */
5252 if (!is_compatible_types(&sym
->type
, type
))
5253 tcc_error("incompatible types for redefinition of '%s'",
5254 get_tok_str(v
, NULL
));
5255 if (sym
->type
.t
& VT_EXTERN
) {
5256 /* if the variable is extern, it was not allocated */
5257 sym
->type
.t
&= ~VT_EXTERN
;
5258 /* set array size if it was ommited in extern
5260 if ((sym
->type
.t
& VT_ARRAY
) &&
5261 sym
->type
.ref
->c
< 0 &&
5263 sym
->type
.ref
->c
= type
->ref
->c
;
5265 /* we accept several definitions of the same
5266 global variable. this is tricky, because we
5267 must play with the SHN_COMMON type of the symbol */
5268 /* XXX: should check if the variable was already
5269 initialized. It is incorrect to initialized it
5271 /* no init data, we won't add more to the symbol */
5278 /* allocate symbol in corresponding section */
5283 else if (tcc_state
->nocommon
)
5287 data_offset
= sec
->data_offset
;
5288 data_offset
= (data_offset
+ align
- 1) & -align
;
5290 /* very important to increment global pointer at this time
5291 because initializers themselves can create new initializers */
5292 data_offset
+= size
;
5293 #ifdef CONFIG_TCC_BCHECK
5294 /* add padding if bound check */
5295 if (tcc_state
->do_bounds_check
)
5298 sec
->data_offset
= data_offset
;
5299 /* allocate section space to put the data */
5300 if (sec
->sh_type
!= SHT_NOBITS
&&
5301 data_offset
> sec
->data_allocated
)
5302 section_realloc(sec
, data_offset
);
5303 /* align section if needed */
5304 if (align
> sec
->sh_addralign
)
5305 sec
->sh_addralign
= align
;
5307 addr
= 0; /* avoid warning */
5311 if (scope
!= VT_CONST
|| !sym
) {
5312 sym
= sym_push(v
, type
, r
| VT_SYM
, 0);
5313 sym
->asm_label
= asm_label
;
5315 /* update symbol definition */
5317 put_extern_sym(sym
, sec
, addr
, size
);
5320 /* put a common area */
5321 put_extern_sym(sym
, NULL
, align
, size
);
5322 /* XXX: find a nicer way */
5323 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
5324 esym
->st_shndx
= SHN_COMMON
;
5329 /* push global reference */
5330 sym
= get_sym_ref(type
, sec
, addr
, size
);
5332 vsetc(type
, VT_CONST
| VT_SYM
, &cval
);
5335 /* patch symbol weakness */
5336 if (type
->t
& VT_WEAK
)
5338 #ifdef CONFIG_TCC_BCHECK
5339 /* handles bounds now because the symbol must be defined
5340 before for the relocation */
5341 if (tcc_state
->do_bounds_check
) {
5342 unsigned long *bounds_ptr
;
5344 greloc(bounds_section
, sym
, bounds_section
->data_offset
, R_DATA_PTR
);
5345 /* then add global bound info */
5346 bounds_ptr
= section_ptr_add(bounds_section
, 2 * sizeof(long));
5347 bounds_ptr
[0] = 0; /* relocated */
5348 bounds_ptr
[1] = size
;
5352 if (has_init
|| (type
->t
& VT_VLA
)) {
5353 decl_initializer(type
, sec
, addr
, 1, 0);
5354 /* restore parse state if needed */
5356 tok_str_free(init_str
.str
);
5357 restore_parse_state(&saved_parse_state
);
5359 /* patch flexible array member size back to -1, */
5360 /* for possible subsequent similar declarations */
5362 flexible_array
->type
.ref
->c
= -1;
5367 static void put_func_debug(Sym
*sym
)
5372 /* XXX: we put here a dummy type */
5373 snprintf(buf
, sizeof(buf
), "%s:%c1",
5374 funcname
, sym
->type
.t
& VT_STATIC
? 'f' : 'F');
5375 put_stabs_r(buf
, N_FUN
, 0, file
->line_num
, 0,
5376 cur_text_section
, sym
->c
);
5377 /* //gr gdb wants a line at the function */
5378 put_stabn(N_SLINE
, 0, file
->line_num
, 0);
5383 /* parse an old style function declaration list */
5384 /* XXX: check multiple parameter */
5385 static void func_decl_list(Sym
*func_sym
)
5392 /* parse each declaration */
5393 while (tok
!= '{' && tok
!= ';' && tok
!= ',' && tok
!= TOK_EOF
&&
5394 tok
!= TOK_ASM1
&& tok
!= TOK_ASM2
&& tok
!= TOK_ASM3
) {
5395 if (!parse_btype(&btype
, &ad
))
5396 expect("declaration list");
5397 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
5398 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
5400 /* we accept no variable after */
5404 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
5405 /* find parameter in function parameter list */
5408 if ((s
->v
& ~SYM_FIELD
) == v
)
5412 tcc_error("declaration for parameter '%s' but no such parameter",
5413 get_tok_str(v
, NULL
));
5415 /* check that no storage specifier except 'register' was given */
5416 if (type
.t
& VT_STORAGE
)
5417 tcc_error("storage class specified for '%s'", get_tok_str(v
, NULL
));
5418 convert_parameter_type(&type
);
5419 /* we can add the type (NOTE: it could be local to the function) */
5421 /* accept other parameters */
5432 /* parse a function defined by symbol 'sym' and generate its code in
5433 'cur_text_section' */
5434 static void gen_function(Sym
*sym
)
5436 int saved_nocode_wanted
= nocode_wanted
;
5438 ind
= cur_text_section
->data_offset
;
5439 /* NOTE: we patch the symbol size later */
5440 put_extern_sym(sym
, cur_text_section
, ind
, 0);
5441 funcname
= get_tok_str(sym
->v
, NULL
);
5443 /* put debug symbol */
5444 if (tcc_state
->do_debug
)
5445 put_func_debug(sym
);
5446 /* push a dummy symbol to enable local sym storage */
5447 sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
5448 gfunc_prolog(&sym
->type
);
5450 block(NULL
, NULL
, NULL
, NULL
, 0, 0);
5453 cur_text_section
->data_offset
= ind
;
5454 label_pop(&global_label_stack
, NULL
);
5455 sym_pop(&local_stack
, NULL
); /* reset local stack */
5456 /* end of function */
5457 /* patch symbol size */
5458 ((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
].st_size
=
5460 /* patch symbol weakness (this definition overrules any prototype) */
5461 if (sym
->type
.t
& VT_WEAK
)
5463 if (tcc_state
->do_debug
) {
5464 put_stabn(N_FUN
, 0, 0, ind
- func_ind
);
5466 /* It's better to crash than to generate wrong code */
5467 cur_text_section
= NULL
;
5468 funcname
= ""; /* for safety */
5469 func_vt
.t
= VT_VOID
; /* for safety */
5470 ind
= 0; /* for safety */
5471 nocode_wanted
= saved_nocode_wanted
;
5474 ST_FUNC
void gen_inline_functions(void)
5477 int *str
, inline_generated
, i
;
5478 struct InlineFunc
*fn
;
5480 /* iterate while inline function are referenced */
5482 inline_generated
= 0;
5483 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
5484 fn
= tcc_state
->inline_fns
[i
];
5486 if (sym
&& sym
->c
) {
5487 /* the function was used: generate its code and
5488 convert it to a normal function */
5489 str
= fn
->token_str
;
5492 strcpy(file
->filename
, fn
->filename
);
5493 sym
->r
= VT_SYM
| VT_CONST
;
5494 sym
->type
.t
&= ~VT_INLINE
;
5498 cur_text_section
= text_section
;
5500 macro_ptr
= NULL
; /* fail safe */
5502 inline_generated
= 1;
5505 if (!inline_generated
)
5508 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
5509 fn
= tcc_state
->inline_fns
[i
];
5510 str
= fn
->token_str
;
5513 dynarray_reset(&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
);
5516 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
5517 static int decl0(int l
, int is_for_loop_init
)
5525 if (!parse_btype(&btype
, &ad
)) {
5526 if (is_for_loop_init
)
5528 /* skip redundant ';' */
5529 /* XXX: find more elegant solution */
5534 if (l
== VT_CONST
&&
5535 (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
5536 /* global asm block */
5540 /* special test for old K&R protos without explicit int
5541 type. Only accepted when defining global data */
5542 if (l
== VT_LOCAL
|| tok
< TOK_DEFINE
)
5546 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
5547 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
5549 /* we accept no variable after */
5553 while (1) { /* iterate thru each declaration */
5554 char *asm_label
; // associated asm label
5556 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
5560 type_to_str(buf
, sizeof(buf
), t
, get_tok_str(v
, NULL
));
5561 printf("type = '%s'\n", buf
);
5564 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
5565 if ((type
.t
& VT_STATIC
) && (l
== VT_LOCAL
)) {
5566 tcc_error("function without file scope cannot be static");
5568 /* if old style function prototype, we accept a
5571 if (sym
->c
== FUNC_OLD
)
5572 func_decl_list(sym
);
5576 if (gnu_ext
&& (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
5579 asm_label_instr(&astr
);
5580 asm_label
= tcc_strdup(astr
.data
);
5583 /* parse one last attribute list, after asm label */
5584 parse_attribute(&ad
);
5589 #ifdef TCC_TARGET_PE
5591 type
.t
|= VT_IMPORT
;
5593 type
.t
|= VT_EXPORT
;
5597 tcc_error("cannot use local functions");
5598 if ((type
.t
& VT_BTYPE
) != VT_FUNC
)
5599 expect("function definition");
5601 /* reject abstract declarators in function definition */
5603 while ((sym
= sym
->next
) != NULL
)
5604 if (!(sym
->v
& ~SYM_FIELD
))
5605 expect("identifier");
5607 /* XXX: cannot do better now: convert extern line to static inline */
5608 if ((type
.t
& (VT_EXTERN
| VT_INLINE
)) == (VT_EXTERN
| VT_INLINE
))
5609 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
5613 if ((sym
->type
.t
& VT_BTYPE
) != VT_FUNC
)
5616 r
= sym
->type
.ref
->r
;
5617 /* use func_call from prototype if not defined */
5618 if (FUNC_CALL(r
) != FUNC_CDECL
5619 && FUNC_CALL(type
.ref
->r
) == FUNC_CDECL
)
5620 FUNC_CALL(type
.ref
->r
) = FUNC_CALL(r
);
5622 /* use export from prototype */
5624 FUNC_EXPORT(type
.ref
->r
) = 1;
5626 /* use static from prototype */
5627 if (sym
->type
.t
& VT_STATIC
)
5628 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
5630 if (!is_compatible_types(&sym
->type
, &type
)) {
5632 tcc_error("incompatible types for redefinition of '%s'",
5633 get_tok_str(v
, NULL
));
5635 /* if symbol is already defined, then put complete type */
5638 /* put function symbol */
5639 sym
= global_identifier_push(v
, type
.t
, 0);
5640 sym
->type
.ref
= type
.ref
;
5643 /* static inline functions are just recorded as a kind
5644 of macro. Their code will be emitted at the end of
5645 the compilation unit only if they are used */
5646 if ((type
.t
& (VT_INLINE
| VT_STATIC
)) ==
5647 (VT_INLINE
| VT_STATIC
)) {
5648 TokenString func_str
;
5650 struct InlineFunc
*fn
;
5651 const char *filename
;
5653 tok_str_new(&func_str
);
5659 tcc_error("unexpected end of file");
5660 tok_str_add_tok(&func_str
);
5665 } else if (t
== '}') {
5667 if (block_level
== 0)
5671 tok_str_add(&func_str
, -1);
5672 tok_str_add(&func_str
, 0);
5673 filename
= file
? file
->filename
: "";
5674 fn
= tcc_malloc(sizeof *fn
+ strlen(filename
));
5675 strcpy(fn
->filename
, filename
);
5677 fn
->token_str
= func_str
.str
;
5678 dynarray_add((void ***)&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
, fn
);
5681 /* compute text section */
5682 cur_text_section
= ad
.section
;
5683 if (!cur_text_section
)
5684 cur_text_section
= text_section
;
5685 sym
->r
= VT_SYM
| VT_CONST
;
5690 if (btype
.t
& VT_TYPEDEF
) {
5691 /* save typedefed type */
5692 /* XXX: test storage specifiers ? */
5693 sym
= sym_push(v
, &type
, INT_ATTR(&ad
), 0);
5694 sym
->type
.t
|= VT_TYPEDEF
;
5697 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
5698 /* external function definition */
5699 /* specific case for func_call attribute */
5700 type
.ref
->r
= INT_ATTR(&ad
);
5701 } else if (!(type
.t
& VT_ARRAY
)) {
5702 /* not lvalue if array */
5703 r
|= lvalue_type(type
.t
);
5705 has_init
= (tok
== '=');
5706 if (has_init
&& (type
.t
& VT_VLA
))
5707 tcc_error("Variable length array cannot be initialized");
5708 if ((btype
.t
& VT_EXTERN
) || ((type
.t
& VT_BTYPE
) == VT_FUNC
) ||
5709 ((type
.t
& VT_ARRAY
) && (type
.t
& VT_STATIC
) &&
5710 !has_init
&& l
== VT_CONST
&& type
.ref
->c
< 0)) {
5711 /* external variable or function */
5712 /* NOTE: as GCC, uninitialized global static
5713 arrays of null size are considered as
5715 sym
= external_sym(v
, &type
, r
, asm_label
);
5717 if (type
.t
& VT_WEAK
)
5720 if (ad
.alias_target
) {
5725 alias_target
= sym_find(ad
.alias_target
);
5726 if (!alias_target
|| !alias_target
->c
)
5727 tcc_error("unsupported forward __alias__ attribute");
5728 esym
= &((Elf32_Sym
*)symtab_section
->data
)[alias_target
->c
];
5729 tsec
.sh_num
= esym
->st_shndx
;
5730 put_extern_sym2(sym
, &tsec
, esym
->st_value
, esym
->st_size
, 0);
5733 type
.t
|= (btype
.t
& VT_STATIC
); /* Retain "static". */
5734 if (type
.t
& VT_STATIC
)
5740 decl_initializer_alloc(&type
, &ad
, r
, has_init
, v
, asm_label
, l
);
5744 if (is_for_loop_init
)
5757 ST_FUNC
void decl(int l
)