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 /* optimize char/short casts */
2326 delayed_cast
= VT_MUSTCAST
;
2327 vtop
->type
.t
= ft
& (VT_TYPE
& ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
)));
2328 /* XXX: factorize */
2329 if (ft
& VT_CONSTANT
)
2330 tcc_warning("assignment of read-only location");
2333 if (!(ft
& VT_BITFIELD
))
2334 gen_assign_cast(&vtop
[-1].type
);
2337 if (sbt
== VT_STRUCT
) {
2338 /* if structure, only generate pointer */
2339 /* structure assignment : generate memcpy */
2340 /* XXX: optimize if small size */
2341 if (!nocode_wanted
) {
2342 size
= type_size(&vtop
->type
, &align
);
2346 vtop
->type
.t
= VT_PTR
;
2349 /* address of memcpy() */
2352 vpush_global_sym(&func_old_type
, TOK_memcpy8
);
2353 else if(!(align
& 3))
2354 vpush_global_sym(&func_old_type
, TOK_memcpy4
);
2357 vpush_global_sym(&func_old_type
, TOK_memcpy
);
2362 vtop
->type
.t
= VT_PTR
;
2371 /* leave source on stack */
2372 } else if (ft
& VT_BITFIELD
) {
2373 /* bitfield store handling */
2374 bit_pos
= (ft
>> VT_STRUCT_SHIFT
) & 0x3f;
2375 bit_size
= (ft
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
2376 /* remove bit field info to avoid loops */
2377 vtop
[-1].type
.t
= ft
& ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
));
2379 /* duplicate source into other register */
2384 if((ft
& VT_BTYPE
) == VT_BOOL
) {
2385 gen_cast(&vtop
[-1].type
);
2386 vtop
[-1].type
.t
= (vtop
[-1].type
.t
& ~VT_BTYPE
) | (VT_BYTE
| VT_UNSIGNED
);
2389 /* duplicate destination */
2391 vtop
[-1] = vtop
[-2];
2393 /* mask and shift source */
2394 if((ft
& VT_BTYPE
) != VT_BOOL
) {
2395 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2396 vpushll((1ULL << bit_size
) - 1ULL);
2398 vpushi((1 << bit_size
) - 1);
2404 /* load destination, mask and or with source */
2406 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2407 vpushll(~(((1ULL << bit_size
) - 1ULL) << bit_pos
));
2409 vpushi(~(((1 << bit_size
) - 1) << bit_pos
));
2416 /* pop off shifted source from "duplicate source..." above */
2420 #ifdef CONFIG_TCC_BCHECK
2421 /* bound check case */
2422 if (vtop
[-1].r
& VT_MUSTBOUND
) {
2428 if (!nocode_wanted
) {
2432 #ifdef TCC_TARGET_X86_64
2433 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
2438 r
= gv(rc
); /* generate value */
2439 /* if lvalue was saved on stack, must read it */
2440 if ((vtop
[-1].r
& VT_VALMASK
) == VT_LLOCAL
) {
2442 t
= get_reg(RC_INT
);
2443 #ifdef TCC_TARGET_X86_64
2448 sv
.r
= VT_LOCAL
| VT_LVAL
;
2449 sv
.c
.ul
= vtop
[-1].c
.ul
;
2451 vtop
[-1].r
= t
| VT_LVAL
;
2454 #ifndef TCC_TARGET_X86_64
2455 /* two word case handling : store second register at word + 4 */
2456 if ((ft
& VT_BTYPE
) == VT_LLONG
) {
2458 /* convert to int to increment easily */
2459 vtop
->type
.t
= VT_INT
;
2465 /* XXX: it works because r2 is spilled last ! */
2466 store(vtop
->r2
, vtop
- 1);
2471 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
2472 vtop
->r
|= delayed_cast
;
2476 /* post defines POST/PRE add. c is the token ++ or -- */
2477 ST_FUNC
void inc(int post
, int c
)
2480 vdup(); /* save lvalue */
2482 gv_dup(); /* duplicate value */
2487 vpushi(c
- TOK_MID
);
2489 vstore(); /* store value */
2491 vpop(); /* if post op, return saved value */
2494 /* Parse GNUC __attribute__ extension. Currently, the following
2495 extensions are recognized:
2496 - aligned(n) : set data/function alignment.
2497 - packed : force data alignment to 1
2498 - section(x) : generate data/code in this section.
2499 - unused : currently ignored, but may be used someday.
2500 - regparm(n) : pass function parameters in registers (i386 only)
2502 static void parse_attribute(AttributeDef
*ad
)
2506 while (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
) {
2510 while (tok
!= ')') {
2511 if (tok
< TOK_IDENT
)
2512 expect("attribute name");
2520 expect("section name");
2521 ad
->section
= find_section(tcc_state
, (char *)tokc
.cstr
->data
);
2529 expect("alias(\"target\")");
2530 ad
->alias_target
= /* save string as token, for later */
2531 tok_alloc((char*)tokc
.cstr
->data
, tokc
.cstr
->size
-1)->tok
;
2540 if (n
<= 0 || (n
& (n
- 1)) != 0)
2541 tcc_error("alignment must be a positive power of two");
2558 /* currently, no need to handle it because tcc does not
2559 track unused objects */
2563 /* currently, no need to handle it because tcc does not
2564 track unused objects */
2569 ad
->func_call
= FUNC_CDECL
;
2574 ad
->func_call
= FUNC_STDCALL
;
2576 #ifdef TCC_TARGET_I386
2586 ad
->func_call
= FUNC_FASTCALL1
+ n
- 1;
2592 ad
->func_call
= FUNC_FASTCALLW
;
2599 ad
->mode
= VT_LLONG
+ 1;
2602 ad
->mode
= VT_SHORT
+ 1;
2605 ad
->mode
= VT_INT
+ 1;
2608 tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok
, NULL
));
2615 ad
->func_export
= 1;
2618 ad
->func_import
= 1;
2621 if (tcc_state
->warn_unsupported
)
2622 tcc_warning("'%s' attribute ignored", get_tok_str(t
, NULL
));
2623 /* skip parameters */
2625 int parenthesis
= 0;
2629 else if (tok
== ')')
2632 } while (parenthesis
&& tok
!= -1);
2645 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
2646 static void struct_decl(CType
*type
, int u
)
2648 int a
, v
, size
, align
, maxalign
, c
, offset
;
2649 int bit_size
, bit_pos
, bsize
, bt
, lbit_pos
, prevbt
;
2650 Sym
*s
, *ss
, *ass
, **ps
;
2654 a
= tok
; /* save decl type */
2659 /* struct already defined ? return it */
2661 expect("struct/union/enum name");
2665 tcc_error("invalid type");
2672 /* we put an undefined size for struct/union */
2673 s
= sym_push(v
| SYM_STRUCT
, &type1
, 0, -1);
2674 s
->r
= 0; /* default alignment is zero as gcc */
2675 /* put struct/union/enum name in type */
2683 tcc_error("struct/union/enum already defined");
2684 /* cannot be empty */
2686 /* non empty enums are not allowed */
2687 if (a
== TOK_ENUM
) {
2691 expect("identifier");
2697 /* enum symbols have static storage */
2698 ss
= sym_push(v
, &int_type
, VT_CONST
, c
);
2699 ss
->type
.t
|= VT_STATIC
;
2704 /* NOTE: we accept a trailing comma */
2715 while (tok
!= '}') {
2716 parse_btype(&btype
, &ad
);
2722 type_decl(&type1
, &ad
, &v
, TYPE_DIRECT
| TYPE_ABSTRACT
);
2723 if (v
== 0 && (type1
.t
& VT_BTYPE
) != VT_STRUCT
)
2724 expect("identifier");
2725 if ((type1
.t
& VT_BTYPE
) == VT_FUNC
||
2726 (type1
.t
& (VT_TYPEDEF
| VT_STATIC
| VT_EXTERN
| VT_INLINE
)))
2727 tcc_error("invalid type for '%s'",
2728 get_tok_str(v
, NULL
));
2732 bit_size
= expr_const();
2733 /* XXX: handle v = 0 case for messages */
2735 tcc_error("negative width in bit-field '%s'",
2736 get_tok_str(v
, NULL
));
2737 if (v
&& bit_size
== 0)
2738 tcc_error("zero width for bit-field '%s'",
2739 get_tok_str(v
, NULL
));
2741 size
= type_size(&type1
, &align
);
2743 if (align
< ad
.aligned
)
2745 } else if (ad
.packed
) {
2747 } else if (*tcc_state
->pack_stack_ptr
) {
2748 if (align
> *tcc_state
->pack_stack_ptr
)
2749 align
= *tcc_state
->pack_stack_ptr
;
2752 if (bit_size
>= 0) {
2753 bt
= type1
.t
& VT_BTYPE
;
2760 tcc_error("bitfields must have scalar type");
2762 if (bit_size
> bsize
) {
2763 tcc_error("width of '%s' exceeds its type",
2764 get_tok_str(v
, NULL
));
2765 } else if (bit_size
== bsize
) {
2766 /* no need for bit fields */
2768 } else if (bit_size
== 0) {
2769 /* XXX: what to do if only padding in a
2771 /* zero size: means to pad */
2774 /* we do not have enough room ?
2775 did the type change?
2777 if ((bit_pos
+ bit_size
) > bsize
||
2778 bt
!= prevbt
|| a
== TOK_UNION
)
2781 /* XXX: handle LSB first */
2782 type1
.t
|= VT_BITFIELD
|
2783 (bit_pos
<< VT_STRUCT_SHIFT
) |
2784 (bit_size
<< (VT_STRUCT_SHIFT
+ 6));
2785 bit_pos
+= bit_size
;
2791 if (v
!= 0 || (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
2792 /* add new memory data only if starting
2794 if (lbit_pos
== 0) {
2795 if (a
== TOK_STRUCT
) {
2796 c
= (c
+ align
- 1) & -align
;
2805 if (align
> maxalign
)
2809 printf("add field %s offset=%d",
2810 get_tok_str(v
, NULL
), offset
);
2811 if (type1
.t
& VT_BITFIELD
) {
2812 printf(" pos=%d size=%d",
2813 (type1
.t
>> VT_STRUCT_SHIFT
) & 0x3f,
2814 (type1
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f);
2819 if (v
== 0 && (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
2821 while ((ass
= ass
->next
) != NULL
) {
2822 ss
= sym_push(ass
->v
, &ass
->type
, 0, offset
+ ass
->c
);
2827 ss
= sym_push(v
| SYM_FIELD
, &type1
, 0, offset
);
2831 if (tok
== ';' || tok
== TOK_EOF
)
2838 /* store size and alignment */
2839 s
->c
= (c
+ maxalign
- 1) & -maxalign
;
2845 /* return 0 if no type declaration. otherwise, return the basic type
2848 static int parse_btype(CType
*type
, AttributeDef
*ad
)
2850 int t
, u
, type_found
, typespec_found
, typedef_found
;
2854 memset(ad
, 0, sizeof(AttributeDef
));
2862 /* currently, we really ignore extension */
2872 if ((t
& VT_BTYPE
) != 0)
2873 tcc_error("too many basic types");
2889 if ((t
& VT_BTYPE
) == VT_DOUBLE
) {
2890 #ifndef TCC_TARGET_PE
2891 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
2893 } else if ((t
& VT_BTYPE
) == VT_LONG
) {
2894 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
2908 if ((t
& VT_BTYPE
) == VT_LONG
) {
2909 #ifdef TCC_TARGET_PE
2910 t
= (t
& ~VT_BTYPE
) | VT_DOUBLE
;
2912 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
2920 struct_decl(&type1
, VT_ENUM
);
2923 type
->ref
= type1
.ref
;
2927 struct_decl(&type1
, VT_STRUCT
);
2930 /* type modifiers */
2983 /* GNUC attribute */
2984 case TOK_ATTRIBUTE1
:
2985 case TOK_ATTRIBUTE2
:
2986 parse_attribute(ad
);
2989 t
= (t
& ~VT_BTYPE
) | u
;
2997 parse_expr_type(&type1
);
2998 /* remove all storage modifiers except typedef */
2999 type1
.t
&= ~(VT_STORAGE
&~VT_TYPEDEF
);
3002 if (typespec_found
|| typedef_found
)
3005 if (!s
|| !(s
->type
.t
& VT_TYPEDEF
))
3008 t
|= (s
->type
.t
& ~VT_TYPEDEF
);
3009 type
->ref
= s
->type
.ref
;
3011 /* get attributes from typedef */
3012 if (0 == ad
->aligned
)
3013 ad
->aligned
= FUNC_ALIGN(s
->r
);
3014 if (0 == ad
->func_call
)
3015 ad
->func_call
= FUNC_CALL(s
->r
);
3016 ad
->packed
|= FUNC_PACKED(s
->r
);
3025 if ((t
& (VT_SIGNED
|VT_UNSIGNED
)) == (VT_SIGNED
|VT_UNSIGNED
))
3026 tcc_error("signed and unsigned modifier");
3027 if (tcc_state
->char_is_unsigned
) {
3028 if ((t
& (VT_SIGNED
|VT_UNSIGNED
|VT_BTYPE
)) == VT_BYTE
)
3033 /* long is never used as type */
3034 if ((t
& VT_BTYPE
) == VT_LONG
)
3035 #if !defined TCC_TARGET_X86_64 || defined TCC_TARGET_PE
3036 t
= (t
& ~VT_BTYPE
) | VT_INT
;
3038 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3044 /* convert a function parameter type (array to pointer and function to
3045 function pointer) */
3046 static inline void convert_parameter_type(CType
*pt
)
3048 /* remove const and volatile qualifiers (XXX: const could be used
3049 to indicate a const function parameter */
3050 pt
->t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3051 /* array must be transformed to pointer according to ANSI C */
3053 if ((pt
->t
& VT_BTYPE
) == VT_FUNC
) {
3058 ST_FUNC
void parse_asm_str(CString
*astr
)
3061 /* read the string */
3063 expect("string constant");
3065 while (tok
== TOK_STR
) {
3066 /* XXX: add \0 handling too ? */
3067 cstr_cat(astr
, tokc
.cstr
->data
);
3070 cstr_ccat(astr
, '\0');
3073 /* Parse an asm label and return the label
3074 * Don't forget to free the CString in the caller! */
3075 static void asm_label_instr(CString
*astr
)
3078 parse_asm_str(astr
);
3081 printf("asm_alias: \"%s\"\n", (char *)astr
->data
);
3085 static void post_type(CType
*type
, AttributeDef
*ad
)
3087 int n
, l
, t1
, arg_size
, align
;
3088 Sym
**plast
, *s
, *first
;
3093 /* function declaration */
3101 /* read param name and compute offset */
3102 if (l
!= FUNC_OLD
) {
3103 if (!parse_btype(&pt
, &ad1
)) {
3105 tcc_error("invalid type");
3112 if ((pt
.t
& VT_BTYPE
) == VT_VOID
&& tok
== ')')
3114 type_decl(&pt
, &ad1
, &n
, TYPE_DIRECT
| TYPE_ABSTRACT
);
3115 if ((pt
.t
& VT_BTYPE
) == VT_VOID
)
3116 tcc_error("parameter declared as void");
3117 arg_size
+= (type_size(&pt
, &align
) + PTR_SIZE
- 1) / PTR_SIZE
;
3122 expect("identifier");
3126 convert_parameter_type(&pt
);
3127 s
= sym_push(n
| SYM_FIELD
, &pt
, 0, 0);
3133 if (l
== FUNC_NEW
&& tok
== TOK_DOTS
) {
3140 /* if no parameters, then old type prototype */
3144 /* NOTE: const is ignored in returned type as it has a special
3145 meaning in gcc / C++ */
3146 type
->t
&= ~VT_CONSTANT
;
3147 /* some ancient pre-K&R C allows a function to return an array
3148 and the array brackets to be put after the arguments, such
3149 that "int c()[]" means something like "int[] c()" */
3152 skip(']'); /* only handle simple "[]" */
3155 /* we push a anonymous symbol which will contain the function prototype */
3156 ad
->func_args
= arg_size
;
3157 s
= sym_push(SYM_FIELD
, type
, INT_ATTR(ad
), l
);
3161 } else if (tok
== '[') {
3162 /* array definition */
3164 if (tok
== TOK_RESTRICT1
)
3169 if (!local_stack
|| nocode_wanted
)
3170 vpushi(expr_const());
3172 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3175 tcc_error("invalid array size");
3177 if (!is_integer_btype(vtop
->type
.t
& VT_BTYPE
))
3178 tcc_error("size of variable length array should be an integer");
3183 /* parse next post type */
3184 post_type(type
, ad
);
3185 t1
|= type
->t
& VT_VLA
;
3188 loc
-= type_size(&int_type
, &align
);
3192 vla_runtime_type_size(type
, &align
);
3194 vset(&int_type
, VT_LOCAL
|VT_LVAL
, loc
);
3201 /* we push an anonymous symbol which will contain the array
3203 s
= sym_push(SYM_FIELD
, type
, 0, n
);
3204 type
->t
= (t1
? VT_VLA
: VT_ARRAY
) | VT_PTR
;
3209 /* Parse a type declaration (except basic type), and return the type
3210 in 'type'. 'td' is a bitmask indicating which kind of type decl is
3211 expected. 'type' should contain the basic type. 'ad' is the
3212 attribute definition of the basic type. It can be modified by
3215 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
)
3218 CType type1
, *type2
;
3219 int qualifiers
, storage
;
3221 while (tok
== '*') {
3229 qualifiers
|= VT_CONSTANT
;
3234 qualifiers
|= VT_VOLATILE
;
3242 type
->t
|= qualifiers
;
3245 /* XXX: clarify attribute handling */
3246 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3247 parse_attribute(ad
);
3249 /* recursive type */
3250 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
3251 type1
.t
= 0; /* XXX: same as int */
3254 /* XXX: this is not correct to modify 'ad' at this point, but
3255 the syntax is not clear */
3256 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3257 parse_attribute(ad
);
3258 type_decl(&type1
, ad
, v
, td
);
3261 /* type identifier */
3262 if (tok
>= TOK_IDENT
&& (td
& TYPE_DIRECT
)) {
3266 if (!(td
& TYPE_ABSTRACT
))
3267 expect("identifier");
3271 storage
= type
->t
& VT_STORAGE
;
3272 type
->t
&= ~VT_STORAGE
;
3273 post_type(type
, ad
);
3275 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3276 parse_attribute(ad
);
3280 /* append type at the end of type1 */
3293 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
3294 ST_FUNC
int lvalue_type(int t
)
3299 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
3301 else if (bt
== VT_SHORT
)
3305 if (t
& VT_UNSIGNED
)
3306 r
|= VT_LVAL_UNSIGNED
;
3310 /* indirection with full error checking and bound check */
3311 ST_FUNC
void indir(void)
3313 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
) {
3314 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FUNC
)
3318 if ((vtop
->r
& VT_LVAL
) && !nocode_wanted
)
3320 vtop
->type
= *pointed_type(&vtop
->type
);
3321 /* Arrays and functions are never lvalues */
3322 if (!(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_VLA
)
3323 && (vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
3324 vtop
->r
|= lvalue_type(vtop
->type
.t
);
3325 /* if bound checking, the referenced pointer must be checked */
3326 #ifdef CONFIG_TCC_BCHECK
3327 if (tcc_state
->do_bounds_check
)
3328 vtop
->r
|= VT_MUSTBOUND
;
3333 /* pass a parameter to a function and do type checking and casting */
3334 static void gfunc_param_typed(Sym
*func
, Sym
*arg
)
3339 func_type
= func
->c
;
3340 if (func_type
== FUNC_OLD
||
3341 (func_type
== FUNC_ELLIPSIS
&& arg
== NULL
)) {
3342 /* default casting : only need to convert float to double */
3343 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
) {
3347 } else if (arg
== NULL
) {
3348 tcc_error("too many arguments to function");
3351 type
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
3352 gen_assign_cast(&type
);
3356 /* parse an expression of the form '(type)' or '(expr)' and return its
3358 static void parse_expr_type(CType
*type
)
3364 if (parse_btype(type
, &ad
)) {
3365 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3372 static void parse_type(CType
*type
)
3377 if (!parse_btype(type
, &ad
)) {
3380 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3383 static void vpush_tokc(int t
)
3388 vsetc(&type
, VT_CONST
, &tokc
);
3391 ST_FUNC
void unary(void)
3393 int n
, t
, align
, size
, r
, sizeof_caller
;
3397 static int in_sizeof
= 0;
3399 sizeof_caller
= in_sizeof
;
3401 /* XXX: GCC 2.95.3 does not generate a table although it should be
3415 vpush_tokc(VT_INT
| VT_UNSIGNED
);
3419 vpush_tokc(VT_LLONG
);
3423 vpush_tokc(VT_LLONG
| VT_UNSIGNED
);
3427 vpush_tokc(VT_FLOAT
);
3431 vpush_tokc(VT_DOUBLE
);
3435 vpush_tokc(VT_LDOUBLE
);
3438 case TOK___FUNCTION__
:
3440 goto tok_identifier
;
3446 /* special function name identifier */
3447 len
= strlen(funcname
) + 1;
3448 /* generate char[len] type */
3453 vpush_ref(&type
, data_section
, data_section
->data_offset
, len
);
3454 ptr
= section_ptr_add(data_section
, len
);
3455 memcpy(ptr
, funcname
, len
);
3460 #ifdef TCC_TARGET_PE
3461 t
= VT_SHORT
| VT_UNSIGNED
;
3467 /* string parsing */
3470 if (tcc_state
->warn_write_strings
)
3475 memset(&ad
, 0, sizeof(AttributeDef
));
3476 decl_initializer_alloc(&type
, &ad
, VT_CONST
, 2, 0, NULL
, 0);
3481 if (parse_btype(&type
, &ad
)) {
3482 type_decl(&type
, &ad
, &n
, TYPE_ABSTRACT
);
3484 /* check ISOC99 compound literal */
3486 /* data is allocated locally by default */
3491 /* all except arrays are lvalues */
3492 if (!(type
.t
& VT_ARRAY
))
3493 r
|= lvalue_type(type
.t
);
3494 memset(&ad
, 0, sizeof(AttributeDef
));
3495 decl_initializer_alloc(&type
, &ad
, r
, 1, 0, NULL
, 0);
3497 if (sizeof_caller
) {
3504 } else if (tok
== '{') {
3505 /* save all registers */
3507 /* statement expression : we do not accept break/continue
3508 inside as GCC does */
3509 block(NULL
, NULL
, NULL
, NULL
, 0, 1);
3524 /* functions names must be treated as function pointers,
3525 except for unary '&' and sizeof. Since we consider that
3526 functions are not lvalues, we only have to handle it
3527 there and in function calls. */
3528 /* arrays can also be used although they are not lvalues */
3529 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
&&
3530 !(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_LLOCAL
))
3532 mk_pointer(&vtop
->type
);
3538 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3540 boolean
.t
= VT_BOOL
;
3542 vtop
->c
.i
= !vtop
->c
.i
;
3543 } else if ((vtop
->r
& VT_VALMASK
) == VT_CMP
)
3544 vtop
->c
.i
= vtop
->c
.i
^ 1;
3547 vseti(VT_JMP
, gtst(1, 0));
3558 /* in order to force cast, we add zero */
3560 if ((vtop
->type
.t
& VT_BTYPE
) == VT_PTR
)
3561 tcc_error("pointer not accepted for unary plus");
3571 unary_type(&type
); // Perform a in_sizeof = 0;
3572 size
= type_size(&type
, &align
);
3573 if (t
== TOK_SIZEOF
) {
3574 if (!(type
.t
& VT_VLA
)) {
3576 tcc_error("sizeof applied to an incomplete type");
3579 vla_runtime_type_size(&type
, &align
);
3584 vtop
->type
.t
|= VT_UNSIGNED
;
3587 case TOK_builtin_types_compatible_p
:
3596 type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3597 type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3598 vpushi(is_compatible_types(&type1
, &type2
));
3601 case TOK_builtin_constant_p
:
3603 int saved_nocode_wanted
, res
;
3606 saved_nocode_wanted
= nocode_wanted
;
3609 res
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
3611 nocode_wanted
= saved_nocode_wanted
;
3616 case TOK_builtin_frame_address
:
3621 if (tok
!= TOK_CINT
) {
3622 tcc_error("__builtin_frame_address only takes integers");
3625 tcc_error("TCC only supports __builtin_frame_address(0)");
3631 vset(&type
, VT_LOCAL
, 0);
3634 #ifdef TCC_TARGET_X86_64
3635 case TOK_builtin_va_arg_types
:
3637 /* This definition must be synced with stdarg.h */
3638 enum __va_arg_type
{
3639 __va_gen_reg
, __va_float_reg
, __va_stack
3647 bt
= type
.t
& VT_BTYPE
;
3648 if (bt
== VT_STRUCT
|| bt
== VT_LDOUBLE
) {
3650 } else if (bt
== VT_FLOAT
|| bt
== VT_DOUBLE
) {
3651 vpushi(__va_float_reg
);
3653 vpushi(__va_gen_reg
);
3673 goto tok_identifier
;
3675 /* allow to take the address of a label */
3676 if (tok
< TOK_UIDENT
)
3677 expect("label identifier");
3678 s
= label_find(tok
);
3680 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
3682 if (s
->r
== LABEL_DECLARED
)
3683 s
->r
= LABEL_FORWARD
;
3686 s
->type
.t
= VT_VOID
;
3687 mk_pointer(&s
->type
);
3688 s
->type
.t
|= VT_STATIC
;
3690 vset(&s
->type
, VT_CONST
| VT_SYM
, 0);
3695 // special qnan , snan and infinity values
3697 vpush64(VT_DOUBLE
, 0x7ff8000000000000ULL
);
3701 vpush64(VT_DOUBLE
, 0x7ff0000000000001ULL
);
3705 vpush64(VT_DOUBLE
, 0x7ff0000000000000ULL
);
3714 expect("identifier");
3718 tcc_error("'%s' undeclared", get_tok_str(t
, NULL
));
3719 /* for simple function calls, we tolerate undeclared
3720 external reference to int() function */
3721 if (tcc_state
->warn_implicit_function_declaration
)
3722 tcc_warning("implicit declaration of function '%s'",
3723 get_tok_str(t
, NULL
));
3724 s
= external_global_sym(t
, &func_old_type
, 0);
3726 if ((s
->type
.t
& (VT_STATIC
| VT_INLINE
| VT_BTYPE
)) ==
3727 (VT_STATIC
| VT_INLINE
| VT_FUNC
)) {
3728 /* if referencing an inline function, then we generate a
3729 symbol to it if not already done. It will have the
3730 effect to generate code for it at the end of the
3731 compilation unit. Inline function as always
3732 generated in the text section. */
3734 put_extern_sym(s
, text_section
, 0, 0);
3735 r
= VT_SYM
| VT_CONST
;
3739 vset(&s
->type
, r
, s
->c
);
3740 /* if forward reference, we must point to s */
3741 if (vtop
->r
& VT_SYM
) {
3748 /* post operations */
3750 if (tok
== TOK_INC
|| tok
== TOK_DEC
) {
3753 } else if (tok
== '.' || tok
== TOK_ARROW
) {
3756 if (tok
== TOK_ARROW
)
3758 qualifiers
= vtop
->type
.t
& (VT_CONSTANT
| VT_VOLATILE
);
3762 /* expect pointer on structure */
3763 if ((vtop
->type
.t
& VT_BTYPE
) != VT_STRUCT
)
3764 expect("struct or union");
3768 while ((s
= s
->next
) != NULL
) {
3773 tcc_error("field not found: %s", get_tok_str(tok
& ~SYM_FIELD
, NULL
));
3774 /* add field offset to pointer */
3775 vtop
->type
= char_pointer_type
; /* change type to 'char *' */
3778 /* change type to field type, and set to lvalue */
3779 vtop
->type
= s
->type
;
3780 vtop
->type
.t
|= qualifiers
;
3781 /* an array is never an lvalue */
3782 if (!(vtop
->type
.t
& VT_ARRAY
)) {
3783 vtop
->r
|= lvalue_type(vtop
->type
.t
);
3784 #ifdef CONFIG_TCC_BCHECK
3785 /* if bound checking, the referenced pointer must be checked */
3786 if (tcc_state
->do_bounds_check
)
3787 vtop
->r
|= VT_MUSTBOUND
;
3791 } else if (tok
== '[') {
3797 } else if (tok
== '(') {
3803 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
3804 /* pointer test (no array accepted) */
3805 if ((vtop
->type
.t
& (VT_BTYPE
| VT_ARRAY
)) == VT_PTR
) {
3806 vtop
->type
= *pointed_type(&vtop
->type
);
3807 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
)
3811 expect("function pointer");
3814 vtop
->r
&= ~VT_LVAL
; /* no lvalue */
3816 /* get return type */
3819 sa
= s
->next
; /* first parameter */
3822 /* compute first implicit argument if a structure is returned */
3823 if ((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
3824 /* get some space for the returned structure */
3825 size
= type_size(&s
->type
, &align
);
3826 loc
= (loc
- size
) & -align
;
3828 ret
.r
= VT_LOCAL
| VT_LVAL
;
3829 /* pass it as 'int' to avoid structure arg passing
3831 vseti(VT_LOCAL
, loc
);
3836 /* return in register */
3837 if (is_float(ret
.type
.t
)) {
3838 ret
.r
= reg_fret(ret
.type
.t
);
3840 if ((ret
.type
.t
& VT_BTYPE
) == VT_LLONG
)
3849 gfunc_param_typed(s
, sa
);
3859 tcc_error("too few arguments to function");
3861 if (!nocode_wanted
) {
3862 gfunc_call(nb_args
);
3864 vtop
-= (nb_args
+ 1);
3867 vsetc(&ret
.type
, ret
.r
, &ret
.c
);
3875 ST_FUNC
void expr_prod(void)
3880 while (tok
== '*' || tok
== '/' || tok
== '%') {
3888 ST_FUNC
void expr_sum(void)
3893 while (tok
== '+' || tok
== '-') {
3901 static void expr_shift(void)
3906 while (tok
== TOK_SHL
|| tok
== TOK_SAR
) {
3914 static void expr_cmp(void)
3919 while ((tok
>= TOK_ULE
&& tok
<= TOK_GT
) ||
3920 tok
== TOK_ULT
|| tok
== TOK_UGE
) {
3928 static void expr_cmpeq(void)
3933 while (tok
== TOK_EQ
|| tok
== TOK_NE
) {
3941 static void expr_and(void)
3944 while (tok
== '&') {
3951 static void expr_xor(void)
3954 while (tok
== '^') {
3961 static void expr_or(void)
3964 while (tok
== '|') {
3971 /* XXX: fix this mess */
3972 static void expr_land_const(void)
3975 while (tok
== TOK_LAND
) {
3982 /* XXX: fix this mess */
3983 static void expr_lor_const(void)
3986 while (tok
== TOK_LOR
) {
3993 /* only used if non constant */
3994 static void expr_land(void)
3999 if (tok
== TOK_LAND
) {
4004 if (tok
!= TOK_LAND
) {
4014 static void expr_lor(void)
4019 if (tok
== TOK_LOR
) {
4024 if (tok
!= TOK_LOR
) {
4034 /* XXX: better constant handling */
4035 static void expr_cond(void)
4037 int tt
, u
, r1
, r2
, rc
, t1
, t2
, bt1
, bt2
;
4039 CType type
, type1
, type2
;
4046 boolean
.t
= VT_BOOL
;
4052 if (tok
!= ':' || !gnu_ext
) {
4067 if (vtop
!= vstack
) {
4068 /* needed to avoid having different registers saved in
4070 if (is_float(vtop
->type
.t
)) {
4072 #ifdef TCC_TARGET_X86_64
4073 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4083 if (tok
== ':' && gnu_ext
) {
4091 sv
= *vtop
; /* save value to handle it later */
4092 vtop
--; /* no vpop so that FP stack is not flushed */
4100 bt1
= t1
& VT_BTYPE
;
4102 bt2
= t2
& VT_BTYPE
;
4103 /* cast operands to correct type according to ISOC rules */
4104 if (is_float(bt1
) || is_float(bt2
)) {
4105 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
4106 type
.t
= VT_LDOUBLE
;
4107 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
4112 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
4113 /* cast to biggest op */
4115 /* convert to unsigned if it does not fit in a long long */
4116 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
4117 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
4118 type
.t
|= VT_UNSIGNED
;
4119 } else if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
4120 /* If one is a null ptr constant the result type
4122 if (is_null_pointer (vtop
))
4124 else if (is_null_pointer (&sv
))
4126 /* XXX: test pointer compatibility, C99 has more elaborate
4130 } else if (bt1
== VT_FUNC
|| bt2
== VT_FUNC
) {
4131 /* XXX: test function pointer compatibility */
4132 type
= bt1
== VT_FUNC
? type1
: type2
;
4133 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
4134 /* XXX: test structure compatibility */
4135 type
= bt1
== VT_STRUCT
? type1
: type2
;
4136 } else if (bt1
== VT_VOID
|| bt2
== VT_VOID
) {
4137 /* NOTE: as an extension, we accept void on only one side */
4140 /* integer operations */
4142 /* convert to unsigned if it does not fit in an integer */
4143 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
4144 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
4145 type
.t
|= VT_UNSIGNED
;
4148 /* now we convert second operand */
4150 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4153 if (is_float(type
.t
)) {
4155 #ifdef TCC_TARGET_X86_64
4156 if ((type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4160 } else if ((type
.t
& VT_BTYPE
) == VT_LLONG
) {
4161 /* for long longs, we use fixed registers to avoid having
4162 to handle a complicated move */
4167 /* this is horrible, but we must also convert first
4171 /* put again first value and cast it */
4174 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4184 static void expr_eq(void)
4190 (tok
>= TOK_A_MOD
&& tok
<= TOK_A_DIV
) ||
4191 tok
== TOK_A_XOR
|| tok
== TOK_A_OR
||
4192 tok
== TOK_A_SHL
|| tok
== TOK_A_SAR
) {
4207 ST_FUNC
void gexpr(void)
4218 /* parse an expression and return its type without any side effect. */
4219 static void expr_type(CType
*type
)
4221 int saved_nocode_wanted
;
4223 saved_nocode_wanted
= nocode_wanted
;
4228 nocode_wanted
= saved_nocode_wanted
;
4231 /* parse a unary expression and return its type without any side
4233 static void unary_type(CType
*type
)
4245 /* parse a constant expression and return value in vtop. */
4246 static void expr_const1(void)
4255 /* parse an integer constant and return its value. */
4256 ST_FUNC
int expr_const(void)
4260 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
4261 expect("constant expression");
4267 /* return the label token if current token is a label, otherwise
4269 static int is_label(void)
4273 /* fast test first */
4274 if (tok
< TOK_UIDENT
)
4276 /* no need to save tokc because tok is an identifier */
4283 unget_tok(last_tok
);
4288 static void block(int *bsym
, int *csym
, int *case_sym
, int *def_sym
,
4289 int case_reg
, int is_expr
)
4294 /* generate line number info */
4295 if (tcc_state
->do_debug
&&
4296 (last_line_num
!= file
->line_num
|| last_ind
!= ind
)) {
4297 put_stabn(N_SLINE
, 0, file
->line_num
, ind
- func_ind
);
4299 last_line_num
= file
->line_num
;
4303 /* default return value is (void) */
4305 vtop
->type
.t
= VT_VOID
;
4308 if (tok
== TOK_IF
) {
4315 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4317 if (c
== TOK_ELSE
) {
4321 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4322 gsym(d
); /* patch else jmp */
4325 } else if (tok
== TOK_WHILE
) {
4333 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4337 } else if (tok
== '{') {
4341 /* record local declaration stack position */
4343 llabel
= local_label_stack
;
4344 /* handle local labels declarations */
4345 if (tok
== TOK_LABEL
) {
4348 if (tok
< TOK_UIDENT
)
4349 expect("label identifier");
4350 label_push(&local_label_stack
, tok
, LABEL_DECLARED
);
4360 while (tok
!= '}') {
4365 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
4368 /* pop locally defined labels */
4369 label_pop(&local_label_stack
, llabel
);
4371 /* XXX: this solution makes only valgrind happy...
4372 triggered by gcc.c-torture/execute/20000917-1.c */
4374 switch(vtop
->type
.t
& VT_BTYPE
) {
4379 for(p
=vtop
->type
.ref
;p
;p
=p
->prev
)
4381 tcc_error("unsupported expression type");
4384 /* pop locally defined symbols */
4385 sym_pop(&local_stack
, s
);
4387 } else if (tok
== TOK_RETURN
) {
4391 gen_assign_cast(&func_vt
);
4392 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
4394 /* if returning structure, must copy it to implicit
4395 first pointer arg location */
4398 size
= type_size(&func_vt
,&align
);
4401 if((vtop
->r
!= (VT_LOCAL
| VT_LVAL
) || (vtop
->c
.i
& 3))
4405 loc
= (loc
- size
) & -4;
4408 vset(&type
, VT_LOCAL
| VT_LVAL
, addr
);
4411 vset(&int_type
, VT_LOCAL
| VT_LVAL
, addr
);
4413 vtop
->type
= int_type
;
4419 vset(&type
, VT_LOCAL
| VT_LVAL
, func_vc
);
4422 /* copy structure value to pointer */
4427 } else if (is_float(func_vt
.t
)) {
4428 gv(rc_fret(func_vt
.t
));
4432 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
4435 rsym
= gjmp(rsym
); /* jmp */
4436 } else if (tok
== TOK_BREAK
) {
4439 tcc_error("cannot break");
4440 *bsym
= gjmp(*bsym
);
4443 } else if (tok
== TOK_CONTINUE
) {
4446 tcc_error("cannot continue");
4447 *csym
= gjmp(*csym
);
4450 } else if (tok
== TOK_FOR
) {
4456 /* c99 for-loop init decl? */
4457 if (!decl0(VT_LOCAL
, 1)) {
4458 /* no, regular for-loop init expr */
4482 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4486 sym_pop(&local_stack
, s
);
4488 if (tok
== TOK_DO
) {
4493 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4504 if (tok
== TOK_SWITCH
) {
4508 /* XXX: other types than integer */
4509 case_reg
= gv(RC_INT
);
4513 b
= gjmp(0); /* jump to first case */
4515 block(&a
, csym
, &b
, &c
, case_reg
, 0);
4516 /* if no default, jmp after switch */
4524 if (tok
== TOK_CASE
) {
4531 if (gnu_ext
&& tok
== TOK_DOTS
) {
4535 tcc_warning("empty case range");
4537 /* since a case is like a label, we must skip it with a jmp */
4544 *case_sym
= gtst(1, 0);
4547 *case_sym
= gtst(1, 0);
4551 *case_sym
= gtst(1, *case_sym
);
4556 goto block_after_label
;
4558 if (tok
== TOK_DEFAULT
) {
4564 tcc_error("too many 'default'");
4567 goto block_after_label
;
4569 if (tok
== TOK_GOTO
) {
4571 if (tok
== '*' && gnu_ext
) {
4575 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
)
4578 } else if (tok
>= TOK_UIDENT
) {
4579 s
= label_find(tok
);
4580 /* put forward definition if needed */
4582 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
4584 if (s
->r
== LABEL_DECLARED
)
4585 s
->r
= LABEL_FORWARD
;
4587 /* label already defined */
4588 if (s
->r
& LABEL_FORWARD
)
4589 s
->jnext
= gjmp(s
->jnext
);
4591 gjmp_addr(s
->jnext
);
4594 expect("label identifier");
4597 } else if (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
) {
4605 if (s
->r
== LABEL_DEFINED
)
4606 tcc_error("duplicate label '%s'", get_tok_str(s
->v
, NULL
));
4608 s
->r
= LABEL_DEFINED
;
4610 s
= label_push(&global_label_stack
, b
, LABEL_DEFINED
);
4613 /* we accept this, but it is a mistake */
4616 tcc_warning("deprecated use of label at end of compound statement");
4620 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
4623 /* expression case */
4638 /* t is the array or struct type. c is the array or struct
4639 address. cur_index/cur_field is the pointer to the current
4640 value. 'size_only' is true if only size info is needed (only used
4642 static void decl_designator(CType
*type
, Section
*sec
, unsigned long c
,
4643 int *cur_index
, Sym
**cur_field
,
4647 int notfirst
, index
, index_last
, align
, l
, nb_elems
, elem_size
;
4653 if (gnu_ext
&& (l
= is_label()) != 0)
4655 while (tok
== '[' || tok
== '.') {
4657 if (!(type
->t
& VT_ARRAY
))
4658 expect("array type");
4661 index
= expr_const();
4662 if (index
< 0 || (s
->c
>= 0 && index
>= s
->c
))
4663 expect("invalid index");
4664 if (tok
== TOK_DOTS
&& gnu_ext
) {
4666 index_last
= expr_const();
4667 if (index_last
< 0 ||
4668 (s
->c
>= 0 && index_last
>= s
->c
) ||
4670 expect("invalid index");
4676 *cur_index
= index_last
;
4677 type
= pointed_type(type
);
4678 elem_size
= type_size(type
, &align
);
4679 c
+= index
* elem_size
;
4680 /* NOTE: we only support ranges for last designator */
4681 nb_elems
= index_last
- index
+ 1;
4682 if (nb_elems
!= 1) {
4691 if ((type
->t
& VT_BTYPE
) != VT_STRUCT
)
4692 expect("struct/union type");
4705 /* XXX: fix this mess by using explicit storage field */
4707 type1
.t
|= (type
->t
& ~VT_TYPE
);
4721 if (type
->t
& VT_ARRAY
) {
4723 type
= pointed_type(type
);
4724 c
+= index
* type_size(type
, &align
);
4728 tcc_error("too many field init");
4729 /* XXX: fix this mess by using explicit storage field */
4731 type1
.t
|= (type
->t
& ~VT_TYPE
);
4736 decl_initializer(type
, sec
, c
, 0, size_only
);
4738 /* XXX: make it more general */
4739 if (!size_only
&& nb_elems
> 1) {
4740 unsigned long c_end
;
4745 tcc_error("range init not supported yet for dynamic storage");
4746 c_end
= c
+ nb_elems
* elem_size
;
4747 if (c_end
> sec
->data_allocated
)
4748 section_realloc(sec
, c_end
);
4749 src
= sec
->data
+ c
;
4751 for(i
= 1; i
< nb_elems
; i
++) {
4753 memcpy(dst
, src
, elem_size
);
4759 #define EXPR_CONST 1
4762 /* store a value or an expression directly in global data or in local array */
4763 static void init_putv(CType
*type
, Section
*sec
, unsigned long c
,
4764 int v
, int expr_type
)
4766 int saved_global_expr
, bt
, bit_pos
, bit_size
;
4768 unsigned long long bit_mask
;
4776 /* compound literals must be allocated globally in this case */
4777 saved_global_expr
= global_expr
;
4780 global_expr
= saved_global_expr
;
4781 /* NOTE: symbols are accepted */
4782 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) != VT_CONST
)
4783 tcc_error("initializer element is not constant");
4791 dtype
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
4794 /* XXX: not portable */
4795 /* XXX: generate error if incorrect relocation */
4796 gen_assign_cast(&dtype
);
4797 bt
= type
->t
& VT_BTYPE
;
4798 /* we'll write at most 12 bytes */
4799 if (c
+ 12 > sec
->data_allocated
) {
4800 section_realloc(sec
, c
+ 12);
4802 ptr
= sec
->data
+ c
;
4803 /* XXX: make code faster ? */
4804 if (!(type
->t
& VT_BITFIELD
)) {
4809 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
4810 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
4811 bit_mask
= (1LL << bit_size
) - 1;
4813 if ((vtop
->r
& VT_SYM
) &&
4819 (bt
== VT_INT
&& bit_size
!= 32)))
4820 tcc_error("initializer element is not computable at load time");
4823 vtop
->c
.i
= (vtop
->c
.i
!= 0);
4825 *(char *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
4828 *(short *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
4831 *(double *)ptr
= vtop
->c
.d
;
4834 *(long double *)ptr
= vtop
->c
.ld
;
4837 *(long long *)ptr
|= (vtop
->c
.ll
& bit_mask
) << bit_pos
;
4840 if (vtop
->r
& VT_SYM
) {
4841 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
4843 *(int *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
4848 vset(&dtype
, VT_LOCAL
|VT_LVAL
, c
);
4855 /* put zeros for variable based init */
4856 static void init_putz(CType
*t
, Section
*sec
, unsigned long c
, int size
)
4859 /* nothing to do because globals are already set to zero */
4861 vpush_global_sym(&func_old_type
, TOK_memset
);
4869 /* 't' contains the type and storage info. 'c' is the offset of the
4870 object in section 'sec'. If 'sec' is NULL, it means stack based
4871 allocation. 'first' is true if array '{' must be read (multi
4872 dimension implicit array init handling). 'size_only' is true if
4873 size only evaluation is wanted (only for arrays). */
4874 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
,
4875 int first
, int size_only
)
4877 int index
, array_length
, n
, no_oblock
, nb
, parlevel
, parlevel1
, i
;
4878 int size1
, align1
, expr_type
;
4882 if (type
->t
& VT_VLA
) {
4883 #if defined TCC_TARGET_I386 || defined TCC_TARGET_X86_64
4887 vpush_global_sym(&func_old_type
, TOK_alloca
);
4888 vla_runtime_type_size(type
, &a
);
4893 vsetc(type
, REG_IRET
, &retcval
);
4894 vset(type
, VT_LOCAL
|VT_LVAL
, c
);
4899 tcc_error("variable length arrays unsupported for this target");
4901 } else if (type
->t
& VT_ARRAY
) {
4905 t1
= pointed_type(type
);
4906 size1
= type_size(t1
, &align1
);
4909 if ((first
&& tok
!= TOK_LSTR
&& tok
!= TOK_STR
) ||
4912 tcc_error("character array initializer must be a literal,"
4913 " optionally enclosed in braces");
4918 /* only parse strings here if correct type (otherwise: handle
4919 them as ((w)char *) expressions */
4920 if ((tok
== TOK_LSTR
&&
4921 #ifdef TCC_TARGET_PE
4922 (t1
->t
& VT_BTYPE
) == VT_SHORT
&& (t1
->t
& VT_UNSIGNED
)
4924 (t1
->t
& VT_BTYPE
) == VT_INT
4926 ) || (tok
== TOK_STR
&& (t1
->t
& VT_BTYPE
) == VT_BYTE
)) {
4927 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
4932 /* compute maximum number of chars wanted */
4934 cstr_len
= cstr
->size
;
4936 cstr_len
= cstr
->size
/ sizeof(nwchar_t
);
4939 if (n
>= 0 && nb
> (n
- array_length
))
4940 nb
= n
- array_length
;
4943 tcc_warning("initializer-string for array is too long");
4944 /* in order to go faster for common case (char
4945 string in global variable, we handle it
4947 if (sec
&& tok
== TOK_STR
&& size1
== 1) {
4948 memcpy(sec
->data
+ c
+ array_length
, cstr
->data
, nb
);
4952 ch
= ((unsigned char *)cstr
->data
)[i
];
4954 ch
= ((nwchar_t
*)cstr
->data
)[i
];
4955 init_putv(t1
, sec
, c
+ (array_length
+ i
) * size1
,
4963 /* only add trailing zero if enough storage (no
4964 warning in this case since it is standard) */
4965 if (n
< 0 || array_length
< n
) {
4967 init_putv(t1
, sec
, c
+ (array_length
* size1
), 0, EXPR_VAL
);
4973 while (tok
!= '}') {
4974 decl_designator(type
, sec
, c
, &index
, NULL
, size_only
);
4975 if (n
>= 0 && index
>= n
)
4976 tcc_error("index too large");
4977 /* must put zero in holes (note that doing it that way
4978 ensures that it even works with designators) */
4979 if (!size_only
&& array_length
< index
) {
4980 init_putz(t1
, sec
, c
+ array_length
* size1
,
4981 (index
- array_length
) * size1
);
4984 if (index
> array_length
)
4985 array_length
= index
;
4986 /* special test for multi dimensional arrays (may not
4987 be strictly correct if designators are used at the
4989 if (index
>= n
&& no_oblock
)
4998 /* put zeros at the end */
4999 if (!size_only
&& n
>= 0 && array_length
< n
) {
5000 init_putz(t1
, sec
, c
+ array_length
* size1
,
5001 (n
- array_length
) * size1
);
5003 /* patch type size if needed */
5005 s
->c
= array_length
;
5006 } else if ((type
->t
& VT_BTYPE
) == VT_STRUCT
&&
5007 (sec
|| !first
|| tok
== '{')) {
5010 /* NOTE: the previous test is a specific case for automatic
5011 struct/union init */
5012 /* XXX: union needs only one init */
5014 /* XXX: this test is incorrect for local initializers
5015 beginning with ( without {. It would be much more difficult
5016 to do it correctly (ideally, the expression parser should
5017 be used in all cases) */
5023 while (tok
== '(') {
5027 if (!parse_btype(&type1
, &ad1
))
5029 type_decl(&type1
, &ad1
, &n
, TYPE_ABSTRACT
);
5031 if (!is_assignable_types(type
, &type1
))
5032 tcc_error("invalid type for cast");
5037 if (first
|| tok
== '{') {
5046 while (tok
!= '}') {
5047 decl_designator(type
, sec
, c
, NULL
, &f
, size_only
);
5049 if (!size_only
&& array_length
< index
) {
5050 init_putz(type
, sec
, c
+ array_length
,
5051 index
- array_length
);
5053 index
= index
+ type_size(&f
->type
, &align1
);
5054 if (index
> array_length
)
5055 array_length
= index
;
5057 /* gr: skip fields from same union - ugly. */
5059 ///printf("index: %2d %08x -- %2d %08x\n", f->c, f->type.t, f->next->c, f->next->type.t);
5060 /* test for same offset */
5061 if (f
->next
->c
!= f
->c
)
5063 /* if yes, test for bitfield shift */
5064 if ((f
->type
.t
& VT_BITFIELD
) && (f
->next
->type
.t
& VT_BITFIELD
)) {
5065 int bit_pos_1
= (f
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5066 int bit_pos_2
= (f
->next
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5067 //printf("bitfield %d %d\n", bit_pos_1, bit_pos_2);
5068 if (bit_pos_1
!= bit_pos_2
)
5075 if (no_oblock
&& f
== NULL
)
5081 /* put zeros at the end */
5082 if (!size_only
&& array_length
< n
) {
5083 init_putz(type
, sec
, c
+ array_length
,
5092 } else if (tok
== '{') {
5094 decl_initializer(type
, sec
, c
, first
, size_only
);
5096 } else if (size_only
) {
5097 /* just skip expression */
5098 parlevel
= parlevel1
= 0;
5099 while ((parlevel
> 0 || parlevel1
> 0 ||
5100 (tok
!= '}' && tok
!= ',')) && tok
!= -1) {
5103 else if (tok
== ')')
5105 else if (tok
== '{')
5107 else if (tok
== '}')
5112 /* currently, we always use constant expression for globals
5113 (may change for scripting case) */
5114 expr_type
= EXPR_CONST
;
5116 expr_type
= EXPR_ANY
;
5117 init_putv(type
, sec
, c
, 0, expr_type
);
5121 /* parse an initializer for type 't' if 'has_init' is non zero, and
5122 allocate space in local or global data space ('r' is either
5123 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
5124 variable 'v' with an associated name represented by 'asm_label' of
5125 scope 'scope' is declared before initializers are parsed. If 'v' is
5126 zero, then a reference to the new object is put in the value stack.
5127 If 'has_init' is 2, a special parsing is done to handle string
5129 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
,
5130 int has_init
, int v
, char *asm_label
,
5133 int size
, align
, addr
, data_offset
;
5135 ParseState saved_parse_state
= {0};
5136 TokenString init_str
;
5138 Sym
*flexible_array
;
5140 flexible_array
= NULL
;
5141 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
5144 while (field
&& field
->next
)
5145 field
= field
->next
;
5146 if (field
->type
.t
& VT_ARRAY
&& field
->type
.ref
->c
< 0)
5147 flexible_array
= field
;
5150 size
= type_size(type
, &align
);
5151 /* If unknown size, we must evaluate it before
5152 evaluating initializers because
5153 initializers can generate global data too
5154 (e.g. string pointers or ISOC99 compound
5155 literals). It also simplifies local
5156 initializers handling */
5157 tok_str_new(&init_str
);
5158 if (size
< 0 || (flexible_array
&& has_init
)) {
5160 tcc_error("unknown type size");
5161 /* get all init string */
5162 if (has_init
== 2) {
5163 /* only get strings */
5164 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5165 tok_str_add_tok(&init_str
);
5170 while (level
> 0 || (tok
!= ',' && tok
!= ';')) {
5172 tcc_error("unexpected end of file in initializer");
5173 tok_str_add_tok(&init_str
);
5176 else if (tok
== '}') {
5186 tok_str_add(&init_str
, -1);
5187 tok_str_add(&init_str
, 0);
5190 save_parse_state(&saved_parse_state
);
5192 macro_ptr
= init_str
.str
;
5194 decl_initializer(type
, NULL
, 0, 1, 1);
5195 /* prepare second initializer parsing */
5196 macro_ptr
= init_str
.str
;
5199 /* if still unknown size, error */
5200 size
= type_size(type
, &align
);
5202 tcc_error("unknown type size");
5205 size
+= flexible_array
->type
.ref
->c
* pointed_size(&flexible_array
->type
);
5206 /* take into account specified alignment if bigger */
5208 if (ad
->aligned
> align
)
5209 align
= ad
->aligned
;
5210 } else if (ad
->packed
) {
5213 if ((r
& VT_VALMASK
) == VT_LOCAL
) {
5215 #ifdef CONFIG_TCC_BCHECK
5216 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5220 loc
= (loc
- size
) & -align
;
5222 #ifdef CONFIG_TCC_BCHECK
5223 /* handles bounds */
5224 /* XXX: currently, since we do only one pass, we cannot track
5225 '&' operators, so we add only arrays */
5226 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5227 unsigned long *bounds_ptr
;
5228 /* add padding between regions */
5230 /* then add local bound info */
5231 bounds_ptr
= section_ptr_add(lbounds_section
, 2 * sizeof(unsigned long));
5232 bounds_ptr
[0] = addr
;
5233 bounds_ptr
[1] = size
;
5237 /* local variable */
5238 sym_push(v
, type
, r
, addr
);
5240 /* push local reference */
5241 vset(type
, r
, addr
);
5247 if (v
&& scope
== VT_CONST
) {
5248 /* see if the symbol was already defined */
5251 if (!is_compatible_types(&sym
->type
, type
))
5252 tcc_error("incompatible types for redefinition of '%s'",
5253 get_tok_str(v
, NULL
));
5254 if (sym
->type
.t
& VT_EXTERN
) {
5255 /* if the variable is extern, it was not allocated */
5256 sym
->type
.t
&= ~VT_EXTERN
;
5257 /* set array size if it was ommited in extern
5259 if ((sym
->type
.t
& VT_ARRAY
) &&
5260 sym
->type
.ref
->c
< 0 &&
5262 sym
->type
.ref
->c
= type
->ref
->c
;
5264 /* we accept several definitions of the same
5265 global variable. this is tricky, because we
5266 must play with the SHN_COMMON type of the symbol */
5267 /* XXX: should check if the variable was already
5268 initialized. It is incorrect to initialized it
5270 /* no init data, we won't add more to the symbol */
5277 /* allocate symbol in corresponding section */
5282 else if (tcc_state
->nocommon
)
5286 data_offset
= sec
->data_offset
;
5287 data_offset
= (data_offset
+ align
- 1) & -align
;
5289 /* very important to increment global pointer at this time
5290 because initializers themselves can create new initializers */
5291 data_offset
+= size
;
5292 #ifdef CONFIG_TCC_BCHECK
5293 /* add padding if bound check */
5294 if (tcc_state
->do_bounds_check
)
5297 sec
->data_offset
= data_offset
;
5298 /* allocate section space to put the data */
5299 if (sec
->sh_type
!= SHT_NOBITS
&&
5300 data_offset
> sec
->data_allocated
)
5301 section_realloc(sec
, data_offset
);
5302 /* align section if needed */
5303 if (align
> sec
->sh_addralign
)
5304 sec
->sh_addralign
= align
;
5306 addr
= 0; /* avoid warning */
5310 if (scope
!= VT_CONST
|| !sym
) {
5311 sym
= sym_push(v
, type
, r
| VT_SYM
, 0);
5312 sym
->asm_label
= asm_label
;
5314 /* update symbol definition */
5316 put_extern_sym(sym
, sec
, addr
, size
);
5319 /* put a common area */
5320 put_extern_sym(sym
, NULL
, align
, size
);
5321 /* XXX: find a nicer way */
5322 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
5323 esym
->st_shndx
= SHN_COMMON
;
5328 /* push global reference */
5329 sym
= get_sym_ref(type
, sec
, addr
, size
);
5331 vsetc(type
, VT_CONST
| VT_SYM
, &cval
);
5334 /* patch symbol weakness */
5335 if (type
->t
& VT_WEAK
)
5337 #ifdef CONFIG_TCC_BCHECK
5338 /* handles bounds now because the symbol must be defined
5339 before for the relocation */
5340 if (tcc_state
->do_bounds_check
) {
5341 unsigned long *bounds_ptr
;
5343 greloc(bounds_section
, sym
, bounds_section
->data_offset
, R_DATA_PTR
);
5344 /* then add global bound info */
5345 bounds_ptr
= section_ptr_add(bounds_section
, 2 * sizeof(long));
5346 bounds_ptr
[0] = 0; /* relocated */
5347 bounds_ptr
[1] = size
;
5351 if (has_init
|| (type
->t
& VT_VLA
)) {
5352 decl_initializer(type
, sec
, addr
, 1, 0);
5353 /* restore parse state if needed */
5355 tok_str_free(init_str
.str
);
5356 restore_parse_state(&saved_parse_state
);
5358 /* patch flexible array member size back to -1, */
5359 /* for possible subsequent similar declarations */
5361 flexible_array
->type
.ref
->c
= -1;
5366 static void put_func_debug(Sym
*sym
)
5371 /* XXX: we put here a dummy type */
5372 snprintf(buf
, sizeof(buf
), "%s:%c1",
5373 funcname
, sym
->type
.t
& VT_STATIC
? 'f' : 'F');
5374 put_stabs_r(buf
, N_FUN
, 0, file
->line_num
, 0,
5375 cur_text_section
, sym
->c
);
5376 /* //gr gdb wants a line at the function */
5377 put_stabn(N_SLINE
, 0, file
->line_num
, 0);
5382 /* parse an old style function declaration list */
5383 /* XXX: check multiple parameter */
5384 static void func_decl_list(Sym
*func_sym
)
5391 /* parse each declaration */
5392 while (tok
!= '{' && tok
!= ';' && tok
!= ',' && tok
!= TOK_EOF
&&
5393 tok
!= TOK_ASM1
&& tok
!= TOK_ASM2
&& tok
!= TOK_ASM3
) {
5394 if (!parse_btype(&btype
, &ad
))
5395 expect("declaration list");
5396 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
5397 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
5399 /* we accept no variable after */
5403 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
5404 /* find parameter in function parameter list */
5407 if ((s
->v
& ~SYM_FIELD
) == v
)
5411 tcc_error("declaration for parameter '%s' but no such parameter",
5412 get_tok_str(v
, NULL
));
5414 /* check that no storage specifier except 'register' was given */
5415 if (type
.t
& VT_STORAGE
)
5416 tcc_error("storage class specified for '%s'", get_tok_str(v
, NULL
));
5417 convert_parameter_type(&type
);
5418 /* we can add the type (NOTE: it could be local to the function) */
5420 /* accept other parameters */
5431 /* parse a function defined by symbol 'sym' and generate its code in
5432 'cur_text_section' */
5433 static void gen_function(Sym
*sym
)
5435 int saved_nocode_wanted
= nocode_wanted
;
5437 ind
= cur_text_section
->data_offset
;
5438 /* NOTE: we patch the symbol size later */
5439 put_extern_sym(sym
, cur_text_section
, ind
, 0);
5440 funcname
= get_tok_str(sym
->v
, NULL
);
5442 /* put debug symbol */
5443 if (tcc_state
->do_debug
)
5444 put_func_debug(sym
);
5445 /* push a dummy symbol to enable local sym storage */
5446 sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
5447 gfunc_prolog(&sym
->type
);
5449 block(NULL
, NULL
, NULL
, NULL
, 0, 0);
5452 cur_text_section
->data_offset
= ind
;
5453 label_pop(&global_label_stack
, NULL
);
5454 sym_pop(&local_stack
, NULL
); /* reset local stack */
5455 /* end of function */
5456 /* patch symbol size */
5457 ((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
].st_size
=
5459 /* patch symbol weakness (this definition overrules any prototype) */
5460 if (sym
->type
.t
& VT_WEAK
)
5462 if (tcc_state
->do_debug
) {
5463 put_stabn(N_FUN
, 0, 0, ind
- func_ind
);
5465 /* It's better to crash than to generate wrong code */
5466 cur_text_section
= NULL
;
5467 funcname
= ""; /* for safety */
5468 func_vt
.t
= VT_VOID
; /* for safety */
5469 ind
= 0; /* for safety */
5470 nocode_wanted
= saved_nocode_wanted
;
5473 ST_FUNC
void gen_inline_functions(void)
5476 int *str
, inline_generated
, i
;
5477 struct InlineFunc
*fn
;
5479 /* iterate while inline function are referenced */
5481 inline_generated
= 0;
5482 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
5483 fn
= tcc_state
->inline_fns
[i
];
5485 if (sym
&& sym
->c
) {
5486 /* the function was used: generate its code and
5487 convert it to a normal function */
5488 str
= fn
->token_str
;
5491 strcpy(file
->filename
, fn
->filename
);
5492 sym
->r
= VT_SYM
| VT_CONST
;
5493 sym
->type
.t
&= ~VT_INLINE
;
5497 cur_text_section
= text_section
;
5499 macro_ptr
= NULL
; /* fail safe */
5501 inline_generated
= 1;
5504 if (!inline_generated
)
5507 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
5508 fn
= tcc_state
->inline_fns
[i
];
5509 str
= fn
->token_str
;
5512 dynarray_reset(&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
);
5515 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
5516 static int decl0(int l
, int is_for_loop_init
)
5524 if (!parse_btype(&btype
, &ad
)) {
5525 if (is_for_loop_init
)
5527 /* skip redundant ';' */
5528 /* XXX: find more elegant solution */
5533 if (l
== VT_CONST
&&
5534 (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
5535 /* global asm block */
5539 /* special test for old K&R protos without explicit int
5540 type. Only accepted when defining global data */
5541 if (l
== VT_LOCAL
|| tok
< TOK_DEFINE
)
5545 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
5546 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
5548 /* we accept no variable after */
5552 while (1) { /* iterate thru each declaration */
5553 char *asm_label
; // associated asm label
5555 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
5559 type_to_str(buf
, sizeof(buf
), t
, get_tok_str(v
, NULL
));
5560 printf("type = '%s'\n", buf
);
5563 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
5564 if ((type
.t
& VT_STATIC
) && (l
== VT_LOCAL
)) {
5565 tcc_error("function without file scope cannot be static");
5567 /* if old style function prototype, we accept a
5570 if (sym
->c
== FUNC_OLD
)
5571 func_decl_list(sym
);
5575 if (gnu_ext
&& (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
5578 asm_label_instr(&astr
);
5579 asm_label
= tcc_strdup(astr
.data
);
5582 /* parse one last attribute list, after asm label */
5583 parse_attribute(&ad
);
5588 #ifdef TCC_TARGET_PE
5590 type
.t
|= VT_IMPORT
;
5592 type
.t
|= VT_EXPORT
;
5596 tcc_error("cannot use local functions");
5597 if ((type
.t
& VT_BTYPE
) != VT_FUNC
)
5598 expect("function definition");
5600 /* reject abstract declarators in function definition */
5602 while ((sym
= sym
->next
) != NULL
)
5603 if (!(sym
->v
& ~SYM_FIELD
))
5604 expect("identifier");
5606 /* XXX: cannot do better now: convert extern line to static inline */
5607 if ((type
.t
& (VT_EXTERN
| VT_INLINE
)) == (VT_EXTERN
| VT_INLINE
))
5608 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
5612 if ((sym
->type
.t
& VT_BTYPE
) != VT_FUNC
)
5615 r
= sym
->type
.ref
->r
;
5616 /* use func_call from prototype if not defined */
5617 if (FUNC_CALL(r
) != FUNC_CDECL
5618 && FUNC_CALL(type
.ref
->r
) == FUNC_CDECL
)
5619 FUNC_CALL(type
.ref
->r
) = FUNC_CALL(r
);
5621 /* use export from prototype */
5623 FUNC_EXPORT(type
.ref
->r
) = 1;
5625 /* use static from prototype */
5626 if (sym
->type
.t
& VT_STATIC
)
5627 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
5629 if (!is_compatible_types(&sym
->type
, &type
)) {
5631 tcc_error("incompatible types for redefinition of '%s'",
5632 get_tok_str(v
, NULL
));
5634 /* if symbol is already defined, then put complete type */
5637 /* put function symbol */
5638 sym
= global_identifier_push(v
, type
.t
, 0);
5639 sym
->type
.ref
= type
.ref
;
5642 /* static inline functions are just recorded as a kind
5643 of macro. Their code will be emitted at the end of
5644 the compilation unit only if they are used */
5645 if ((type
.t
& (VT_INLINE
| VT_STATIC
)) ==
5646 (VT_INLINE
| VT_STATIC
)) {
5647 TokenString func_str
;
5649 struct InlineFunc
*fn
;
5650 const char *filename
;
5652 tok_str_new(&func_str
);
5658 tcc_error("unexpected end of file");
5659 tok_str_add_tok(&func_str
);
5664 } else if (t
== '}') {
5666 if (block_level
== 0)
5670 tok_str_add(&func_str
, -1);
5671 tok_str_add(&func_str
, 0);
5672 filename
= file
? file
->filename
: "";
5673 fn
= tcc_malloc(sizeof *fn
+ strlen(filename
));
5674 strcpy(fn
->filename
, filename
);
5676 fn
->token_str
= func_str
.str
;
5677 dynarray_add((void ***)&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
, fn
);
5680 /* compute text section */
5681 cur_text_section
= ad
.section
;
5682 if (!cur_text_section
)
5683 cur_text_section
= text_section
;
5684 sym
->r
= VT_SYM
| VT_CONST
;
5689 if (btype
.t
& VT_TYPEDEF
) {
5690 /* save typedefed type */
5691 /* XXX: test storage specifiers ? */
5692 sym
= sym_push(v
, &type
, INT_ATTR(&ad
), 0);
5693 sym
->type
.t
|= VT_TYPEDEF
;
5696 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
5697 /* external function definition */
5698 /* specific case for func_call attribute */
5699 type
.ref
->r
= INT_ATTR(&ad
);
5700 } else if (!(type
.t
& VT_ARRAY
)) {
5701 /* not lvalue if array */
5702 r
|= lvalue_type(type
.t
);
5704 has_init
= (tok
== '=');
5705 if (has_init
&& (type
.t
& VT_VLA
))
5706 tcc_error("Variable length array cannot be initialized");
5707 if ((btype
.t
& VT_EXTERN
) || ((type
.t
& VT_BTYPE
) == VT_FUNC
) ||
5708 ((type
.t
& VT_ARRAY
) && (type
.t
& VT_STATIC
) &&
5709 !has_init
&& l
== VT_CONST
&& type
.ref
->c
< 0)) {
5710 /* external variable or function */
5711 /* NOTE: as GCC, uninitialized global static
5712 arrays of null size are considered as
5714 sym
= external_sym(v
, &type
, r
, asm_label
);
5716 if (type
.t
& VT_WEAK
)
5719 if (ad
.alias_target
) {
5724 alias_target
= sym_find(ad
.alias_target
);
5725 if (!alias_target
|| !alias_target
->c
)
5726 tcc_error("unsupported forward __alias__ attribute");
5727 esym
= &((Elf32_Sym
*)symtab_section
->data
)[alias_target
->c
];
5728 tsec
.sh_num
= esym
->st_shndx
;
5729 put_extern_sym2(sym
, &tsec
, esym
->st_value
, esym
->st_size
, 0);
5732 type
.t
|= (btype
.t
& VT_STATIC
); /* Retain "static". */
5733 if (type
.t
& VT_STATIC
)
5739 decl_initializer_alloc(&type
, &ad
, r
, has_init
, v
, asm_label
, l
);
5743 if (is_for_loop_init
)
5756 ST_FUNC
void decl(int l
)