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
*scope_stack_bottom
;
54 ST_DATA Sym
*define_stack
;
55 ST_DATA Sym
*global_label_stack
;
56 ST_DATA Sym
*local_label_stack
;
58 ST_DATA
int vla_sp_loc_tmp
; /* vla_sp_loc is set to this when the value won't be needed later */
59 ST_DATA
int vla_sp_root_loc
; /* vla_sp_loc for SP before any VLAs were pushed */
60 ST_DATA
int *vla_sp_loc
; /* Pointer to variable holding location to store stack pointer on the stack when modifying stack pointer */
61 ST_DATA
int vla_flags
; /* VLA_* flags */
63 ST_DATA SValue __vstack
[1+VSTACK_SIZE
], *vtop
;
65 ST_DATA
int const_wanted
; /* true if constant wanted */
66 ST_DATA
int nocode_wanted
; /* true if no code generation wanted for an expression */
67 ST_DATA
int global_expr
; /* true if compound literals must be allocated globally (used during initializers parsing */
68 ST_DATA CType func_vt
; /* current function return type (used by return instruction) */
69 ST_DATA
int func_var
; /* true if current function is variadic (used by return instruction) */
71 ST_DATA
int last_line_num
, last_ind
, func_ind
; /* debug last line number and pc */
72 ST_DATA
char *funcname
;
74 ST_DATA CType char_pointer_type
, func_old_type
, int_type
, size_type
;
76 /* ------------------------------------------------------------------------- */
77 static void gen_cast(CType
*type
);
78 static inline CType
*pointed_type(CType
*type
);
79 static int is_compatible_types(CType
*type1
, CType
*type2
);
80 static int parse_btype(CType
*type
, AttributeDef
*ad
);
81 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
);
82 static void parse_expr_type(CType
*type
);
83 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
, int first
, int size_only
);
84 static void block(int *bsym
, int *csym
, int *case_sym
, int *def_sym
, int case_reg
, int is_expr
);
85 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
, int has_init
, int v
, char *asm_label
, int scope
);
86 static int decl0(int l
, int is_for_loop_init
);
87 static void expr_eq(void);
88 static void unary_type(CType
*type
);
89 static void vla_runtime_type_size(CType
*type
, int *a
);
90 static void vla_sp_save(void);
91 static int is_compatible_parameter_types(CType
*type1
, CType
*type2
);
92 static void expr_type(CType
*type
);
94 ST_INLN
int is_float(int t
)
98 return bt
== VT_LDOUBLE
|| bt
== VT_DOUBLE
|| bt
== VT_FLOAT
|| bt
== VT_QFLOAT
;
101 /* we use our own 'finite' function to avoid potential problems with
102 non standard math libs */
103 /* XXX: endianness dependent */
104 ST_FUNC
int ieee_finite(double d
)
107 memcpy(p
, &d
, sizeof(double));
108 return ((unsigned)((p
[1] | 0x800fffff) + 1)) >> 31;
111 ST_FUNC
void test_lvalue(void)
113 if (!(vtop
->r
& VT_LVAL
))
117 /* ------------------------------------------------------------------------- */
118 /* symbol allocator */
119 static Sym
*__sym_malloc(void)
121 Sym
*sym_pool
, *sym
, *last_sym
;
124 sym_pool
= tcc_malloc(SYM_POOL_NB
* sizeof(Sym
));
125 dynarray_add(&sym_pools
, &nb_sym_pools
, sym_pool
);
127 last_sym
= sym_free_first
;
129 for(i
= 0; i
< SYM_POOL_NB
; i
++) {
130 sym
->next
= last_sym
;
134 sym_free_first
= last_sym
;
138 static inline Sym
*sym_malloc(void)
141 sym
= sym_free_first
;
143 sym
= __sym_malloc();
144 sym_free_first
= sym
->next
;
148 ST_INLN
void sym_free(Sym
*sym
)
150 sym
->next
= sym_free_first
;
151 tcc_free(sym
->asm_label
);
152 sym_free_first
= sym
;
155 /* push, without hashing */
156 ST_FUNC Sym
*sym_push2(Sym
**ps
, int v
, int t
, long c
)
159 if (ps
== &local_stack
) {
160 for (s
= *ps
; s
&& s
!= scope_stack_bottom
; s
= s
->prev
)
161 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
&& s
->v
== v
)
162 tcc_error("incompatible types for redefinition of '%s'",
163 get_tok_str(v
, NULL
));
182 /* find a symbol and return its associated structure. 's' is the top
183 of the symbol stack */
184 ST_FUNC Sym
*sym_find2(Sym
*s
, int v
)
194 /* structure lookup */
195 ST_INLN Sym
*struct_find(int v
)
198 if ((unsigned)v
>= (unsigned)(tok_ident
- TOK_IDENT
))
200 return table_ident
[v
]->sym_struct
;
203 /* find an identifier */
204 ST_INLN Sym
*sym_find(int v
)
207 if ((unsigned)v
>= (unsigned)(tok_ident
- TOK_IDENT
))
209 return table_ident
[v
]->sym_identifier
;
212 /* push a given symbol on the symbol stack */
213 ST_FUNC Sym
*sym_push(int v
, CType
*type
, int r
, int c
)
222 s
= sym_push2(ps
, v
, type
->t
, c
);
223 s
->type
.ref
= type
->ref
;
225 /* don't record fields or anonymous symbols */
227 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
228 /* record symbol in token array */
229 ts
= table_ident
[(v
& ~SYM_STRUCT
) - TOK_IDENT
];
231 ps
= &ts
->sym_struct
;
233 ps
= &ts
->sym_identifier
;
240 /* push a global identifier */
241 ST_FUNC Sym
*global_identifier_push(int v
, int t
, int c
)
244 s
= sym_push2(&global_stack
, v
, t
, c
);
245 /* don't record anonymous symbol */
246 if (v
< SYM_FIRST_ANOM
) {
247 ps
= &table_ident
[v
- TOK_IDENT
]->sym_identifier
;
248 /* modify the top most local identifier, so that
249 sym_identifier will point to 's' when popped */
251 ps
= &(*ps
)->prev_tok
;
258 /* pop symbols until top reaches 'b' */
259 ST_FUNC
void sym_pop(Sym
**ptop
, Sym
*b
)
269 /* remove symbol in token array */
271 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
272 ts
= table_ident
[(v
& ~SYM_STRUCT
) - TOK_IDENT
];
274 ps
= &ts
->sym_struct
;
276 ps
= &ts
->sym_identifier
;
285 static void weaken_symbol(Sym
*sym
)
287 sym
->type
.t
|= VT_WEAK
;
292 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
293 esym_type
= ELFW(ST_TYPE
)(esym
->st_info
);
294 esym
->st_info
= ELFW(ST_INFO
)(STB_WEAK
, esym_type
);
298 /* ------------------------------------------------------------------------- */
300 ST_FUNC
void swap(int *p
, int *q
)
308 static void vsetc(CType
*type
, int r
, CValue
*vc
)
312 if (vtop
>= vstack
+ (VSTACK_SIZE
- 1))
313 tcc_error("memory full (vstack)");
314 /* cannot let cpu flags if other instruction are generated. Also
315 avoid leaving VT_JMP anywhere except on the top of the stack
316 because it would complicate the code generator. */
317 if (vtop
>= vstack
) {
318 v
= vtop
->r
& VT_VALMASK
;
319 if (v
== VT_CMP
|| (v
& ~1) == VT_JMP
)
329 /* push constant of type "type" with useless value */
330 void vpush(CType
*type
)
333 vsetc(type
, VT_CONST
, &cval
);
336 /* push integer constant */
337 ST_FUNC
void vpushi(int v
)
341 vsetc(&int_type
, VT_CONST
, &cval
);
344 /* push a pointer sized constant */
345 static void vpushs(long long v
)
352 vsetc(&size_type
, VT_CONST
, &cval
);
355 /* push arbitrary 64bit constant */
356 void vpush64(int ty
, unsigned long long v
)
363 vsetc(&ctype
, VT_CONST
, &cval
);
366 /* push long long constant */
367 static inline void vpushll(long long v
)
369 vpush64(VT_LLONG
, v
);
372 /* Return a static symbol pointing to a section */
373 ST_FUNC Sym
*get_sym_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
379 sym
= global_identifier_push(v
, type
->t
| VT_STATIC
, 0);
380 sym
->type
.ref
= type
->ref
;
381 sym
->r
= VT_CONST
| VT_SYM
;
382 put_extern_sym(sym
, sec
, offset
, size
);
386 /* push a reference to a section offset by adding a dummy symbol */
387 static void vpush_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
392 vsetc(type
, VT_CONST
| VT_SYM
, &cval
);
393 vtop
->sym
= get_sym_ref(type
, sec
, offset
, size
);
396 /* define a new external reference to a symbol 'v' of type 'u' */
397 ST_FUNC Sym
*external_global_sym(int v
, CType
*type
, int r
)
403 /* push forward reference */
404 s
= global_identifier_push(v
, type
->t
| VT_EXTERN
, 0);
405 s
->type
.ref
= type
->ref
;
406 s
->r
= r
| VT_CONST
| VT_SYM
;
411 /* define a new external reference to a symbol 'v' with alternate asm
412 name 'asm_label' of type 'u'. 'asm_label' is equal to NULL if there
413 is no alternate name (most cases) */
414 static Sym
*external_sym(int v
, CType
*type
, int r
, char *asm_label
)
420 /* push forward reference */
421 s
= sym_push(v
, type
, r
| VT_CONST
| VT_SYM
, 0);
422 s
->asm_label
= asm_label
;
423 s
->type
.t
|= VT_EXTERN
;
424 } else if (s
->type
.ref
== func_old_type
.ref
) {
425 s
->type
.ref
= type
->ref
;
426 s
->r
= r
| VT_CONST
| VT_SYM
;
427 s
->type
.t
|= VT_EXTERN
;
428 } else if (!is_compatible_types(&s
->type
, type
)) {
429 tcc_error("incompatible types for redefinition of '%s'",
430 get_tok_str(v
, NULL
));
435 /* push a reference to global symbol v */
436 ST_FUNC
void vpush_global_sym(CType
*type
, int v
)
441 sym
= external_global_sym(v
, type
, 0);
443 vsetc(type
, VT_CONST
| VT_SYM
, &cval
);
447 ST_FUNC
void vset(CType
*type
, int r
, int v
)
452 vsetc(type
, r
, &cval
);
455 static void vseti(int r
, int v
)
463 ST_FUNC
void vswap(void)
466 /* cannot let cpu flags if other instruction are generated. Also
467 avoid leaving VT_JMP anywhere except on the top of the stack
468 because it would complicate the code generator. */
469 if (vtop
>= vstack
) {
470 int v
= vtop
->r
& VT_VALMASK
;
471 if (v
== VT_CMP
|| (v
& ~1) == VT_JMP
)
478 /* XXX: +2% overall speed possible with optimized memswap
480 * memswap(&vtop[0], &vtop[1], sizeof *vtop);
484 ST_FUNC
void vpushv(SValue
*v
)
486 if (vtop
>= vstack
+ (VSTACK_SIZE
- 1))
487 tcc_error("memory full (vstack)");
492 static void vdup(void)
497 /* save r to the memory stack, and mark it as being free */
498 ST_FUNC
void save_reg(int r
)
500 int l
, saved
, size
, align
;
504 /* modify all stack values */
507 for(p
=vstack
;p
<=vtop
;p
++) {
508 if ((p
->r
& VT_VALMASK
) == r
||
509 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& (p
->r2
& VT_VALMASK
) == r
)) {
510 /* must save value on stack if not already done */
512 /* NOTE: must reload 'r' because r might be equal to r2 */
513 r
= p
->r
& VT_VALMASK
;
514 /* store register in the stack */
516 if ((p
->r
& VT_LVAL
) ||
517 (!is_float(type
->t
) && (type
->t
& VT_BTYPE
) != VT_LLONG
))
518 #ifdef TCC_TARGET_X86_64
519 type
= &char_pointer_type
;
523 size
= type_size(type
, &align
);
524 loc
= (loc
- size
) & -align
;
526 sv
.r
= VT_LOCAL
| VT_LVAL
;
529 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
530 /* x86 specific: need to pop fp register ST0 if saved */
532 o(0xd8dd); /* fstp %st(0) */
535 #ifndef TCC_TARGET_X86_64
536 /* special long long case */
537 if ((type
->t
& VT_BTYPE
) == VT_LLONG
) {
545 /* mark that stack entry as being saved on the stack */
546 if (p
->r
& VT_LVAL
) {
547 /* also clear the bounded flag because the
548 relocation address of the function was stored in
550 p
->r
= (p
->r
& ~(VT_VALMASK
| VT_BOUNDED
)) | VT_LLOCAL
;
552 p
->r
= lvalue_type(p
->type
.t
) | VT_LOCAL
;
560 #ifdef TCC_TARGET_ARM
561 /* find a register of class 'rc2' with at most one reference on stack.
562 * If none, call get_reg(rc) */
563 ST_FUNC
int get_reg_ex(int rc
, int rc2
)
568 for(r
=0;r
<NB_REGS
;r
++) {
569 if (reg_classes
[r
] & rc2
) {
572 for(p
= vstack
; p
<= vtop
; p
++) {
573 if ((p
->r
& VT_VALMASK
) == r
||
574 (p
->r2
& VT_VALMASK
) == r
)
585 /* find a free register of class 'rc'. If none, save one register */
586 ST_FUNC
int get_reg(int rc
)
591 /* find a free register */
592 for(r
=0;r
<NB_REGS
;r
++) {
593 if (reg_classes
[r
] & rc
) {
594 for(p
=vstack
;p
<=vtop
;p
++) {
595 if ((p
->r
& VT_VALMASK
) == r
||
596 (p
->r2
& VT_VALMASK
) == r
)
604 /* no register left : free the first one on the stack (VERY
605 IMPORTANT to start from the bottom to ensure that we don't
606 spill registers used in gen_opi()) */
607 for(p
=vstack
;p
<=vtop
;p
++) {
608 /* look at second register (if long long) */
609 r
= p
->r2
& VT_VALMASK
;
610 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
))
612 r
= p
->r
& VT_VALMASK
;
613 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
)) {
619 /* Should never comes here */
623 /* save registers up to (vtop - n) stack entry */
624 ST_FUNC
void save_regs(int n
)
629 for(p
= vstack
;p
<= p1
; p
++) {
630 r
= p
->r
& VT_VALMASK
;
637 /* move register 's' (of type 't') to 'r', and flush previous value of r to memory
639 static void move_reg(int r
, int s
, int t
)
653 /* get address of vtop (vtop MUST BE an lvalue) */
654 static void gaddrof(void)
656 if (vtop
->r
& VT_REF
)
659 /* tricky: if saved lvalue, then we can go back to lvalue */
660 if ((vtop
->r
& VT_VALMASK
) == VT_LLOCAL
)
661 vtop
->r
= (vtop
->r
& ~(VT_VALMASK
| VT_LVAL_TYPE
)) | VT_LOCAL
| VT_LVAL
;
666 #ifdef CONFIG_TCC_BCHECK
667 /* generate lvalue bound code */
668 static void gbound(void)
673 vtop
->r
&= ~VT_MUSTBOUND
;
674 /* if lvalue, then use checking code before dereferencing */
675 if (vtop
->r
& VT_LVAL
) {
676 /* if not VT_BOUNDED value, then make one */
677 if (!(vtop
->r
& VT_BOUNDED
)) {
678 lval_type
= vtop
->r
& (VT_LVAL_TYPE
| VT_LVAL
);
679 /* must save type because we must set it to int to get pointer */
681 vtop
->type
.t
= VT_INT
;
684 gen_bounded_ptr_add();
685 vtop
->r
|= lval_type
;
688 /* then check for dereferencing */
689 gen_bounded_ptr_deref();
694 /* store vtop a register belonging to class 'rc'. lvalues are
695 converted to values. Cannot be used if cannot be converted to
696 register value (such as structures). */
697 ST_FUNC
int gv(int rc
)
699 int r
, bit_pos
, bit_size
, size
, align
, i
;
702 /* NOTE: get_reg can modify vstack[] */
703 if (vtop
->type
.t
& VT_BITFIELD
) {
706 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
707 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
708 /* remove bit field info to avoid loops */
709 vtop
->type
.t
&= ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
));
710 /* cast to int to propagate signedness in following ops */
711 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
716 if((vtop
->type
.t
& VT_UNSIGNED
) ||
717 (vtop
->type
.t
& VT_BTYPE
) == VT_BOOL
)
718 type
.t
|= VT_UNSIGNED
;
720 /* generate shifts */
721 vpushi(bits
- (bit_pos
+ bit_size
));
723 vpushi(bits
- bit_size
);
724 /* NOTE: transformed to SHR if unsigned */
728 if (is_float(vtop
->type
.t
) &&
729 (vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
732 unsigned long offset
;
733 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
737 /* XXX: unify with initializers handling ? */
738 /* CPUs usually cannot use float constants, so we store them
739 generically in data segment */
740 size
= type_size(&vtop
->type
, &align
);
741 offset
= (data_section
->data_offset
+ align
- 1) & -align
;
742 data_section
->data_offset
= offset
;
743 /* XXX: not portable yet */
744 #if defined(__i386__) || defined(__x86_64__)
745 /* Zero pad x87 tenbyte long doubles */
746 if (size
== LDOUBLE_SIZE
) {
747 vtop
->c
.tab
[2] &= 0xffff;
748 #if LDOUBLE_SIZE == 16
753 ptr
= section_ptr_add(data_section
, size
);
755 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
759 ptr
[i
] = vtop
->c
.tab
[size
-1-i
];
763 ptr
[i
] = vtop
->c
.tab
[i
];
764 sym
= get_sym_ref(&vtop
->type
, data_section
, offset
, size
<< 2);
765 vtop
->r
|= VT_LVAL
| VT_SYM
;
769 #ifdef CONFIG_TCC_BCHECK
770 if (vtop
->r
& VT_MUSTBOUND
)
774 r
= vtop
->r
& VT_VALMASK
;
775 rc2
= (rc
& RC_FLOAT
) ? RC_FLOAT
: RC_INT
;
778 #ifdef TCC_TARGET_X86_64
779 else if (rc
== RC_FRET
)
783 /* need to reload if:
785 - lvalue (need to dereference pointer)
786 - already a register, but not in the right class */
788 || (vtop
->r
& VT_LVAL
)
789 || !(reg_classes
[r
] & rc
)
790 #ifdef TCC_TARGET_X86_64
791 || ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
&& !(reg_classes
[vtop
->r2
] & rc2
))
792 || ((vtop
->type
.t
& VT_BTYPE
) == VT_QFLOAT
&& !(reg_classes
[vtop
->r2
] & rc2
))
794 || ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
&& !(reg_classes
[vtop
->r2
] & rc2
))
799 #ifdef TCC_TARGET_X86_64
800 if (((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) || ((vtop
->type
.t
& VT_BTYPE
) == VT_QFLOAT
)) {
801 int addr_type
= VT_LLONG
, load_size
= 8, load_type
= ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) ? VT_LLONG
: VT_DOUBLE
;
803 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
804 int addr_type
= VT_INT
, load_size
= 4, load_type
= VT_INT
;
805 unsigned long long ll
;
807 int r2
, original_type
;
808 original_type
= vtop
->type
.t
;
809 /* two register type load : expand to two words
811 #ifndef TCC_TARGET_X86_64
812 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
815 vtop
->c
.ui
= ll
; /* first word */
817 vtop
->r
= r
; /* save register value */
818 vpushi(ll
>> 32); /* second word */
821 if (r
>= VT_CONST
|| /* XXX: test to VT_CONST incorrect ? */
822 (vtop
->r
& VT_LVAL
)) {
823 /* We do not want to modifier the long long
824 pointer here, so the safest (and less
825 efficient) is to save all the other registers
826 in the stack. XXX: totally inefficient. */
828 /* load from memory */
829 vtop
->type
.t
= load_type
;
832 vtop
[-1].r
= r
; /* save register value */
833 /* increment pointer to get second word */
834 vtop
->type
.t
= addr_type
;
839 vtop
->type
.t
= load_type
;
844 vtop
[-1].r
= r
; /* save register value */
845 vtop
->r
= vtop
[-1].r2
;
847 /* Allocate second register. Here we rely on the fact that
848 get_reg() tries first to free r2 of an SValue. */
852 /* write second register */
854 vtop
->type
.t
= original_type
;
855 } else if ((vtop
->r
& VT_LVAL
) && !is_float(vtop
->type
.t
)) {
857 /* lvalue of scalar type : need to use lvalue type
858 because of possible cast */
861 /* compute memory access type */
862 if (vtop
->r
& VT_REF
)
863 #ifdef TCC_TARGET_X86_64
868 else if (vtop
->r
& VT_LVAL_BYTE
)
870 else if (vtop
->r
& VT_LVAL_SHORT
)
872 if (vtop
->r
& VT_LVAL_UNSIGNED
)
876 /* restore wanted type */
879 /* one register type load */
884 #ifdef TCC_TARGET_C67
885 /* uses register pairs for doubles */
886 if ((vtop
->type
.t
& VT_BTYPE
) == VT_DOUBLE
)
893 /* generate vtop[-1] and vtop[0] in resp. classes rc1 and rc2 */
894 ST_FUNC
void gv2(int rc1
, int rc2
)
898 /* generate more generic register first. But VT_JMP or VT_CMP
899 values must be generated first in all cases to avoid possible
901 v
= vtop
[0].r
& VT_VALMASK
;
902 if (v
!= VT_CMP
&& (v
& ~1) != VT_JMP
&& rc1
<= rc2
) {
907 /* test if reload is needed for first register */
908 if ((vtop
[-1].r
& VT_VALMASK
) >= VT_CONST
) {
918 /* test if reload is needed for first register */
919 if ((vtop
[0].r
& VT_VALMASK
) >= VT_CONST
) {
925 /* wrapper around RC_FRET to return a register by type */
926 static int rc_fret(int t
)
928 #ifdef TCC_TARGET_X86_64
929 if (t
== VT_LDOUBLE
) {
936 /* wrapper around REG_FRET to return a register by type */
937 static int reg_fret(int t
)
939 #ifdef TCC_TARGET_X86_64
940 if (t
== VT_LDOUBLE
) {
947 /* expand long long on stack in two int registers */
948 static void lexpand(void)
952 u
= vtop
->type
.t
& VT_UNSIGNED
;
955 vtop
[0].r
= vtop
[-1].r2
;
956 vtop
[0].r2
= VT_CONST
;
957 vtop
[-1].r2
= VT_CONST
;
958 vtop
[0].type
.t
= VT_INT
| u
;
959 vtop
[-1].type
.t
= VT_INT
| u
;
962 #ifdef TCC_TARGET_ARM
963 /* expand long long on stack */
964 ST_FUNC
void lexpand_nr(void)
968 u
= vtop
->type
.t
& VT_UNSIGNED
;
971 vtop
->type
.t
= VT_INT
| u
;
972 v
=vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
);
974 vtop
[-1].c
.ui
= vtop
->c
.ull
;
975 vtop
->c
.ui
= vtop
->c
.ull
>> 32;
977 } else if (v
== (VT_LVAL
|VT_CONST
) || v
== (VT_LVAL
|VT_LOCAL
)) {
979 vtop
->r
= vtop
[-1].r
;
980 } else if (v
> VT_CONST
) {
984 vtop
->r
= vtop
[-1].r2
;
985 vtop
[-1].r2
= VT_CONST
;
986 vtop
[-1].type
.t
= VT_INT
| u
;
990 /* build a long long from two ints */
991 static void lbuild(int t
)
994 vtop
[-1].r2
= vtop
[0].r
;
999 /* rotate n first stack elements to the bottom
1000 I1 ... In -> I2 ... In I1 [top is right]
1002 ST_FUNC
void vrotb(int n
)
1008 for(i
=-n
+1;i
!=0;i
++)
1009 vtop
[i
] = vtop
[i
+1];
1013 /* rotate the n elements before entry e towards the top
1014 I1 ... In ... -> In I1 ... I(n-1) ... [top is right]
1016 ST_FUNC
void vrote(SValue
*e
, int n
)
1022 for(i
= 0;i
< n
- 1; i
++)
1027 /* rotate n first stack elements to the top
1028 I1 ... In -> In I1 ... I(n-1) [top is right]
1030 ST_FUNC
void vrott(int n
)
1035 /* pop stack value */
1036 ST_FUNC
void vpop(void)
1039 v
= vtop
->r
& VT_VALMASK
;
1040 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
1041 /* for x86, we need to pop the FP stack */
1042 if (v
== TREG_ST0
&& !nocode_wanted
) {
1043 o(0xd8dd); /* fstp %st(0) */
1046 if (v
== VT_JMP
|| v
== VT_JMPI
) {
1047 /* need to put correct jump if && or || without test */
1053 /* convert stack entry to register and duplicate its value in another
1055 static void gv_dup(void)
1061 if ((t
& VT_BTYPE
) == VT_LLONG
) {
1068 /* stack: H L L1 H1 */
1076 /* duplicate value */
1081 #ifdef TCC_TARGET_X86_64
1082 if ((t
& VT_BTYPE
) == VT_LDOUBLE
) {
1092 load(r1
, &sv
); /* move r to r1 */
1094 /* duplicates value */
1100 /* Generate value test
1102 * Generate a test for any value (jump, comparison and integers) */
1103 int gvtst(int inv
, int t
)
1105 int v
= vtop
->r
& VT_VALMASK
;
1106 if (v
!= VT_CMP
&& v
!= VT_JMP
&& v
!= VT_JMPI
) {
1110 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
1111 /* constant jmp optimization */
1112 if ((vtop
->c
.i
!= 0) != inv
)
1117 return gtst(inv
, t
);
1120 #ifndef TCC_TARGET_X86_64
1121 /* generate CPU independent (unsigned) long long operations */
1122 static void gen_opl(int op
)
1124 int t
, a
, b
, op1
, c
, i
;
1126 unsigned short reg_iret
= REG_IRET
;
1127 unsigned short reg_lret
= REG_LRET
;
1133 func
= TOK___divdi3
;
1136 func
= TOK___udivdi3
;
1139 func
= TOK___moddi3
;
1142 func
= TOK___umoddi3
;
1149 /* call generic long long function */
1150 vpush_global_sym(&func_old_type
, func
);
1155 vtop
->r2
= reg_lret
;
1168 /* stack: L1 H1 L2 H2 */
1173 vtop
[-2] = vtop
[-3];
1176 /* stack: H1 H2 L1 L2 */
1182 /* stack: H1 H2 L1 L2 ML MH */
1185 /* stack: ML MH H1 H2 L1 L2 */
1189 /* stack: ML MH H1 L2 H2 L1 */
1194 /* stack: ML MH M1 M2 */
1197 } else if (op
== '+' || op
== '-') {
1198 /* XXX: add non carry method too (for MIPS or alpha) */
1204 /* stack: H1 H2 (L1 op L2) */
1207 gen_op(op1
+ 1); /* TOK_xxxC2 */
1210 /* stack: H1 H2 (L1 op L2) */
1213 /* stack: (L1 op L2) H1 H2 */
1215 /* stack: (L1 op L2) (H1 op H2) */
1223 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
1224 t
= vtop
[-1].type
.t
;
1228 /* stack: L H shift */
1230 /* constant: simpler */
1231 /* NOTE: all comments are for SHL. the other cases are
1232 done by swaping words */
1243 if (op
!= TOK_SAR
) {
1276 /* XXX: should provide a faster fallback on x86 ? */
1279 func
= TOK___ashrdi3
;
1282 func
= TOK___lshrdi3
;
1285 func
= TOK___ashldi3
;
1291 /* compare operations */
1297 /* stack: L1 H1 L2 H2 */
1299 vtop
[-1] = vtop
[-2];
1301 /* stack: L1 L2 H1 H2 */
1304 /* when values are equal, we need to compare low words. since
1305 the jump is inverted, we invert the test too. */
1308 else if (op1
== TOK_GT
)
1310 else if (op1
== TOK_ULT
)
1312 else if (op1
== TOK_UGT
)
1317 if (op1
!= TOK_NE
) {
1321 /* generate non equal test */
1322 /* XXX: NOT PORTABLE yet */
1326 #if defined(TCC_TARGET_I386)
1327 b
= psym(0x850f, 0);
1328 #elif defined(TCC_TARGET_ARM)
1330 o(0x1A000000 | encbranch(ind
, 0, 1));
1331 #elif defined(TCC_TARGET_C67)
1332 tcc_error("not implemented");
1334 #error not supported
1338 /* compare low. Always unsigned */
1342 else if (op1
== TOK_LE
)
1344 else if (op1
== TOK_GT
)
1346 else if (op1
== TOK_GE
)
1357 /* handle integer constant optimizations and various machine
1359 static void gen_opic(int op
)
1361 int c1
, c2
, t1
, t2
, n
;
1364 typedef unsigned long long U
;
1368 t1
= v1
->type
.t
& VT_BTYPE
;
1369 t2
= v2
->type
.t
& VT_BTYPE
;
1373 else if (v1
->type
.t
& VT_UNSIGNED
)
1380 else if (v2
->type
.t
& VT_UNSIGNED
)
1385 /* currently, we cannot do computations with forward symbols */
1386 c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1387 c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1390 case '+': l1
+= l2
; break;
1391 case '-': l1
-= l2
; break;
1392 case '&': l1
&= l2
; break;
1393 case '^': l1
^= l2
; break;
1394 case '|': l1
|= l2
; break;
1395 case '*': l1
*= l2
; break;
1402 /* if division by zero, generate explicit division */
1405 tcc_error("division by zero in constant");
1409 default: l1
/= l2
; break;
1410 case '%': l1
%= l2
; break;
1411 case TOK_UDIV
: l1
= (U
)l1
/ l2
; break;
1412 case TOK_UMOD
: l1
= (U
)l1
% l2
; break;
1415 case TOK_SHL
: l1
<<= l2
; break;
1416 case TOK_SHR
: l1
= (U
)l1
>> l2
; break;
1417 case TOK_SAR
: l1
>>= l2
; break;
1419 case TOK_ULT
: l1
= (U
)l1
< (U
)l2
; break;
1420 case TOK_UGE
: l1
= (U
)l1
>= (U
)l2
; break;
1421 case TOK_EQ
: l1
= l1
== l2
; break;
1422 case TOK_NE
: l1
= l1
!= l2
; break;
1423 case TOK_ULE
: l1
= (U
)l1
<= (U
)l2
; break;
1424 case TOK_UGT
: l1
= (U
)l1
> (U
)l2
; break;
1425 case TOK_LT
: l1
= l1
< l2
; break;
1426 case TOK_GE
: l1
= l1
>= l2
; break;
1427 case TOK_LE
: l1
= l1
<= l2
; break;
1428 case TOK_GT
: l1
= l1
> l2
; break;
1430 case TOK_LAND
: l1
= l1
&& l2
; break;
1431 case TOK_LOR
: l1
= l1
|| l2
; break;
1438 /* if commutative ops, put c2 as constant */
1439 if (c1
&& (op
== '+' || op
== '&' || op
== '^' ||
1440 op
== '|' || op
== '*')) {
1442 c2
= c1
; //c = c1, c1 = c2, c2 = c;
1443 l2
= l1
; //l = l1, l1 = l2, l2 = l;
1445 /* Filter out NOP operations like x*1, x-0, x&-1... */
1446 if (c2
&& (((op
== '*' || op
== '/' || op
== TOK_UDIV
||
1449 ((op
== '+' || op
== '-' || op
== '|' || op
== '^' ||
1450 op
== TOK_SHL
|| op
== TOK_SHR
|| op
== TOK_SAR
) &&
1456 } else if (c2
&& (op
== '*' || op
== TOK_PDIV
|| op
== TOK_UDIV
)) {
1457 /* try to use shifts instead of muls or divs */
1458 if (l2
> 0 && (l2
& (l2
- 1)) == 0) {
1467 else if (op
== TOK_PDIV
)
1473 } else if (c2
&& (op
== '+' || op
== '-') &&
1474 (((vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
))
1475 || (vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
)) == VT_LOCAL
)) {
1476 /* symbol + constant case */
1483 if (!nocode_wanted
) {
1484 /* call low level op generator */
1485 if (t1
== VT_LLONG
|| t2
== VT_LLONG
)
1496 /* generate a floating point operation with constant propagation */
1497 static void gen_opif(int op
)
1505 /* currently, we cannot do computations with forward symbols */
1506 c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1507 c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1509 if (v1
->type
.t
== VT_FLOAT
) {
1512 } else if (v1
->type
.t
== VT_DOUBLE
) {
1520 /* NOTE: we only do constant propagation if finite number (not
1521 NaN or infinity) (ANSI spec) */
1522 if (!ieee_finite(f1
) || !ieee_finite(f2
))
1526 case '+': f1
+= f2
; break;
1527 case '-': f1
-= f2
; break;
1528 case '*': f1
*= f2
; break;
1532 tcc_error("division by zero in constant");
1537 /* XXX: also handles tests ? */
1541 /* XXX: overflow test ? */
1542 if (v1
->type
.t
== VT_FLOAT
) {
1544 } else if (v1
->type
.t
== VT_DOUBLE
) {
1552 if (!nocode_wanted
) {
1560 static int pointed_size(CType
*type
)
1563 return type_size(pointed_type(type
), &align
);
1566 static void vla_runtime_pointed_size(CType
*type
)
1569 vla_runtime_type_size(pointed_type(type
), &align
);
1572 static inline int is_null_pointer(SValue
*p
)
1574 if ((p
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
1576 return ((p
->type
.t
& VT_BTYPE
) == VT_INT
&& p
->c
.i
== 0) ||
1577 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& p
->c
.ll
== 0) ||
1578 ((p
->type
.t
& VT_BTYPE
) == VT_PTR
&& p
->c
.ptr
== 0);
1581 static inline int is_integer_btype(int bt
)
1583 return (bt
== VT_BYTE
|| bt
== VT_SHORT
||
1584 bt
== VT_INT
|| bt
== VT_LLONG
);
1587 /* check types for comparison or substraction of pointers */
1588 static void check_comparison_pointer_types(SValue
*p1
, SValue
*p2
, int op
)
1590 CType
*type1
, *type2
, tmp_type1
, tmp_type2
;
1593 /* null pointers are accepted for all comparisons as gcc */
1594 if (is_null_pointer(p1
) || is_null_pointer(p2
))
1598 bt1
= type1
->t
& VT_BTYPE
;
1599 bt2
= type2
->t
& VT_BTYPE
;
1600 /* accept comparison between pointer and integer with a warning */
1601 if ((is_integer_btype(bt1
) || is_integer_btype(bt2
)) && op
!= '-') {
1602 if (op
!= TOK_LOR
&& op
!= TOK_LAND
)
1603 tcc_warning("comparison between pointer and integer");
1607 /* both must be pointers or implicit function pointers */
1608 if (bt1
== VT_PTR
) {
1609 type1
= pointed_type(type1
);
1610 } else if (bt1
!= VT_FUNC
)
1611 goto invalid_operands
;
1613 if (bt2
== VT_PTR
) {
1614 type2
= pointed_type(type2
);
1615 } else if (bt2
!= VT_FUNC
) {
1617 tcc_error("invalid operands to binary %s", get_tok_str(op
, NULL
));
1619 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
1620 (type2
->t
& VT_BTYPE
) == VT_VOID
)
1624 tmp_type1
.t
&= ~(VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1625 tmp_type2
.t
&= ~(VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1626 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
1627 /* gcc-like error if '-' is used */
1629 goto invalid_operands
;
1631 tcc_warning("comparison of distinct pointer types lacks a cast");
1635 /* generic gen_op: handles types problems */
1636 ST_FUNC
void gen_op(int op
)
1638 int u
, t1
, t2
, bt1
, bt2
, t
;
1641 t1
= vtop
[-1].type
.t
;
1642 t2
= vtop
[0].type
.t
;
1643 bt1
= t1
& VT_BTYPE
;
1644 bt2
= t2
& VT_BTYPE
;
1646 if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
1647 /* at least one operand is a pointer */
1648 /* relationnal op: must be both pointers */
1649 if (op
>= TOK_ULT
&& op
<= TOK_LOR
) {
1650 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1651 /* pointers are handled are unsigned */
1652 #ifdef TCC_TARGET_X86_64
1653 t
= VT_LLONG
| VT_UNSIGNED
;
1655 t
= VT_INT
| VT_UNSIGNED
;
1659 /* if both pointers, then it must be the '-' op */
1660 if (bt1
== VT_PTR
&& bt2
== VT_PTR
) {
1662 tcc_error("cannot use pointers here");
1663 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1664 /* XXX: check that types are compatible */
1665 if (vtop
[-1].type
.t
& VT_VLA
) {
1666 vla_runtime_pointed_size(&vtop
[-1].type
);
1668 vpushi(pointed_size(&vtop
[-1].type
));
1672 /* set to integer type */
1673 #ifdef TCC_TARGET_X86_64
1674 vtop
->type
.t
= VT_LLONG
;
1676 vtop
->type
.t
= VT_INT
;
1681 /* exactly one pointer : must be '+' or '-'. */
1682 if (op
!= '-' && op
!= '+')
1683 tcc_error("cannot use pointers here");
1684 /* Put pointer as first operand */
1685 if (bt2
== VT_PTR
) {
1689 type1
= vtop
[-1].type
;
1690 type1
.t
&= ~VT_ARRAY
;
1691 if (vtop
[-1].type
.t
& VT_VLA
)
1692 vla_runtime_pointed_size(&vtop
[-1].type
);
1694 u
= pointed_size(&vtop
[-1].type
);
1696 tcc_error("unknown array element size");
1697 #ifdef TCC_TARGET_X86_64
1700 /* XXX: cast to int ? (long long case) */
1705 #ifdef CONFIG_TCC_BCHECK
1706 /* if evaluating constant expression, no code should be
1707 generated, so no bound check */
1708 if (tcc_state
->do_bounds_check
&& !const_wanted
) {
1709 /* if bounded pointers, we generate a special code to
1716 gen_bounded_ptr_add();
1722 /* put again type if gen_opic() swaped operands */
1725 } else if (is_float(bt1
) || is_float(bt2
)) {
1726 /* compute bigger type and do implicit casts */
1727 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
1729 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
1734 /* floats can only be used for a few operations */
1735 if (op
!= '+' && op
!= '-' && op
!= '*' && op
!= '/' &&
1736 (op
< TOK_ULT
|| op
> TOK_GT
))
1737 tcc_error("invalid operands for binary operation");
1739 } else if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
) {
1740 t
= bt1
== VT_LLONG
? VT_LLONG
: VT_INT
;
1741 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (t
| VT_UNSIGNED
))
1744 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
1745 /* cast to biggest op */
1747 /* convert to unsigned if it does not fit in a long long */
1748 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
1749 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
1752 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
1753 tcc_error("comparison of struct");
1755 /* integer operations */
1757 /* convert to unsigned if it does not fit in an integer */
1758 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
1759 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
1762 /* XXX: currently, some unsigned operations are explicit, so
1763 we modify them here */
1764 if (t
& VT_UNSIGNED
) {
1771 else if (op
== TOK_LT
)
1773 else if (op
== TOK_GT
)
1775 else if (op
== TOK_LE
)
1777 else if (op
== TOK_GE
)
1784 /* special case for shifts and long long: we keep the shift as
1786 if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
)
1793 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
1794 /* relationnal op: the result is an int */
1795 vtop
->type
.t
= VT_INT
;
1802 #ifndef TCC_TARGET_ARM
1803 /* generic itof for unsigned long long case */
1804 static void gen_cvt_itof1(int t
)
1806 if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
1807 (VT_LLONG
| VT_UNSIGNED
)) {
1810 vpush_global_sym(&func_old_type
, TOK___floatundisf
);
1811 #if LDOUBLE_SIZE != 8
1812 else if (t
== VT_LDOUBLE
)
1813 vpush_global_sym(&func_old_type
, TOK___floatundixf
);
1816 vpush_global_sym(&func_old_type
, TOK___floatundidf
);
1820 vtop
->r
= reg_fret(t
);
1827 /* generic ftoi for unsigned long long case */
1828 static void gen_cvt_ftoi1(int t
)
1832 if (t
== (VT_LLONG
| VT_UNSIGNED
)) {
1833 /* not handled natively */
1834 st
= vtop
->type
.t
& VT_BTYPE
;
1836 vpush_global_sym(&func_old_type
, TOK___fixunssfdi
);
1837 #if LDOUBLE_SIZE != 8
1838 else if (st
== VT_LDOUBLE
)
1839 vpush_global_sym(&func_old_type
, TOK___fixunsxfdi
);
1842 vpush_global_sym(&func_old_type
, TOK___fixunsdfdi
);
1847 vtop
->r2
= REG_LRET
;
1853 /* force char or short cast */
1854 static void force_charshort_cast(int t
)
1858 /* XXX: add optimization if lvalue : just change type and offset */
1863 if (t
& VT_UNSIGNED
) {
1864 vpushi((1 << bits
) - 1);
1870 /* result must be signed or the SAR is converted to an SHL
1871 This was not the case when "t" was a signed short
1872 and the last value on the stack was an unsigned int */
1873 vtop
->type
.t
&= ~VT_UNSIGNED
;
1879 /* cast 'vtop' to 'type'. Casting to bitfields is forbidden. */
1880 static void gen_cast(CType
*type
)
1882 int sbt
, dbt
, sf
, df
, c
, p
;
1884 /* special delayed cast for char/short */
1885 /* XXX: in some cases (multiple cascaded casts), it may still
1887 if (vtop
->r
& VT_MUSTCAST
) {
1888 vtop
->r
&= ~VT_MUSTCAST
;
1889 force_charshort_cast(vtop
->type
.t
);
1892 /* bitfields first get cast to ints */
1893 if (vtop
->type
.t
& VT_BITFIELD
) {
1897 dbt
= type
->t
& (VT_BTYPE
| VT_UNSIGNED
);
1898 sbt
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
1903 c
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1904 p
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
);
1906 /* constant case: we can do it now */
1907 /* XXX: in ISOC, cannot do it if error in convert */
1908 if (sbt
== VT_FLOAT
)
1909 vtop
->c
.ld
= vtop
->c
.f
;
1910 else if (sbt
== VT_DOUBLE
)
1911 vtop
->c
.ld
= vtop
->c
.d
;
1914 if ((sbt
& VT_BTYPE
) == VT_LLONG
) {
1915 if (sbt
& VT_UNSIGNED
)
1916 vtop
->c
.ld
= vtop
->c
.ull
;
1918 vtop
->c
.ld
= vtop
->c
.ll
;
1920 if (sbt
& VT_UNSIGNED
)
1921 vtop
->c
.ld
= vtop
->c
.ui
;
1923 vtop
->c
.ld
= vtop
->c
.i
;
1926 if (dbt
== VT_FLOAT
)
1927 vtop
->c
.f
= (float)vtop
->c
.ld
;
1928 else if (dbt
== VT_DOUBLE
)
1929 vtop
->c
.d
= (double)vtop
->c
.ld
;
1930 } else if (sf
&& dbt
== (VT_LLONG
|VT_UNSIGNED
)) {
1931 vtop
->c
.ull
= (unsigned long long)vtop
->c
.ld
;
1932 } else if (sf
&& dbt
== VT_BOOL
) {
1933 vtop
->c
.i
= (vtop
->c
.ld
!= 0);
1936 vtop
->c
.ll
= (long long)vtop
->c
.ld
;
1937 else if (sbt
== (VT_LLONG
|VT_UNSIGNED
))
1938 vtop
->c
.ll
= vtop
->c
.ull
;
1939 else if (sbt
& VT_UNSIGNED
)
1940 vtop
->c
.ll
= vtop
->c
.ui
;
1941 #ifdef TCC_TARGET_X86_64
1942 else if (sbt
== VT_PTR
)
1945 else if (sbt
!= VT_LLONG
)
1946 vtop
->c
.ll
= vtop
->c
.i
;
1948 if (dbt
== (VT_LLONG
|VT_UNSIGNED
))
1949 vtop
->c
.ull
= vtop
->c
.ll
;
1950 else if (dbt
== VT_BOOL
)
1951 vtop
->c
.i
= (vtop
->c
.ll
!= 0);
1952 else if (dbt
!= VT_LLONG
) {
1954 if ((dbt
& VT_BTYPE
) == VT_BYTE
)
1956 else if ((dbt
& VT_BTYPE
) == VT_SHORT
)
1959 if(dbt
& VT_UNSIGNED
)
1960 vtop
->c
.ui
= ((unsigned int)vtop
->c
.ll
<< s
) >> s
;
1962 vtop
->c
.i
= ((int)vtop
->c
.ll
<< s
) >> s
;
1965 } else if (p
&& dbt
== VT_BOOL
) {
1968 } else if (!nocode_wanted
) {
1969 /* non constant case: generate code */
1971 /* convert from fp to fp */
1974 /* convert int to fp */
1977 /* convert fp to int */
1978 if (dbt
== VT_BOOL
) {
1982 /* we handle char/short/etc... with generic code */
1983 if (dbt
!= (VT_INT
| VT_UNSIGNED
) &&
1984 dbt
!= (VT_LLONG
| VT_UNSIGNED
) &&
1988 if (dbt
== VT_INT
&& (type
->t
& (VT_BTYPE
| VT_UNSIGNED
)) != dbt
) {
1989 /* additional cast for char/short... */
1994 #ifndef TCC_TARGET_X86_64
1995 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
) {
1996 if ((sbt
& VT_BTYPE
) != VT_LLONG
) {
1997 /* scalar to long long */
1998 /* machine independent conversion */
2000 /* generate high word */
2001 if (sbt
== (VT_INT
| VT_UNSIGNED
)) {
2005 if (sbt
== VT_PTR
) {
2006 /* cast from pointer to int before we apply
2007 shift operation, which pointers don't support*/
2008 gen_cast(&int_type
);
2014 /* patch second register */
2015 vtop
[-1].r2
= vtop
->r
;
2019 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
||
2020 (dbt
& VT_BTYPE
) == VT_PTR
||
2021 (dbt
& VT_BTYPE
) == VT_FUNC
) {
2022 if ((sbt
& VT_BTYPE
) != VT_LLONG
&&
2023 (sbt
& VT_BTYPE
) != VT_PTR
&&
2024 (sbt
& VT_BTYPE
) != VT_FUNC
) {
2025 /* need to convert from 32bit to 64bit */
2027 if (sbt
!= (VT_INT
| VT_UNSIGNED
)) {
2028 /* x86_64 specific: movslq */
2030 o(0xc0 + (REG_VALUE(r
) << 3) + REG_VALUE(r
));
2034 } else if (dbt
== VT_BOOL
) {
2035 /* scalar to bool */
2038 } else if ((dbt
& VT_BTYPE
) == VT_BYTE
||
2039 (dbt
& VT_BTYPE
) == VT_SHORT
) {
2040 if (sbt
== VT_PTR
) {
2041 vtop
->type
.t
= VT_INT
;
2042 tcc_warning("nonportable conversion from pointer to char/short");
2044 force_charshort_cast(dbt
);
2045 } else if ((dbt
& VT_BTYPE
) == VT_INT
) {
2047 if (sbt
== VT_LLONG
) {
2048 /* from long long: just take low order word */
2052 /* if lvalue and single word type, nothing to do because
2053 the lvalue already contains the real type size (see
2054 VT_LVAL_xxx constants) */
2057 } else if ((dbt
& VT_BTYPE
) == VT_PTR
&& !(vtop
->r
& VT_LVAL
)) {
2058 /* if we are casting between pointer types,
2059 we must update the VT_LVAL_xxx size */
2060 vtop
->r
= (vtop
->r
& ~VT_LVAL_TYPE
)
2061 | (lvalue_type(type
->ref
->type
.t
) & VT_LVAL_TYPE
);
2066 /* return type size as known at compile time. Put alignment at 'a' */
2067 ST_FUNC
int type_size(CType
*type
, int *a
)
2072 bt
= type
->t
& VT_BTYPE
;
2073 if (bt
== VT_STRUCT
) {
2078 } else if (bt
== VT_PTR
) {
2079 if (type
->t
& VT_ARRAY
) {
2083 ts
= type_size(&s
->type
, a
);
2085 if (ts
< 0 && s
->c
< 0)
2093 } else if (bt
== VT_LDOUBLE
) {
2095 return LDOUBLE_SIZE
;
2096 } else if (bt
== VT_DOUBLE
|| bt
== VT_LLONG
) {
2097 #ifdef TCC_TARGET_I386
2098 #ifdef TCC_TARGET_PE
2103 #elif defined(TCC_TARGET_ARM)
2113 } else if (bt
== VT_INT
|| bt
== VT_ENUM
|| bt
== VT_FLOAT
) {
2116 } else if (bt
== VT_SHORT
) {
2119 } else if (bt
== VT_QLONG
|| bt
== VT_QFLOAT
) {
2123 /* char, void, function, _Bool */
2129 /* push type size as known at runtime time on top of value stack. Put
2131 ST_FUNC
void vla_runtime_type_size(CType
*type
, int *a
)
2133 if (type
->t
& VT_VLA
) {
2134 vset(&int_type
, VT_LOCAL
|VT_LVAL
, type
->ref
->c
);
2136 vpushi(type_size(type
, a
));
2140 static void vla_sp_save(void) {
2141 if (!(vla_flags
& VLA_SP_LOC_SET
)) {
2142 *vla_sp_loc
= (loc
-= PTR_SIZE
);
2143 vla_flags
|= VLA_SP_LOC_SET
;
2145 if (!(vla_flags
& VLA_SP_SAVED
)) {
2146 gen_vla_sp_save(*vla_sp_loc
);
2147 vla_flags
|= VLA_SP_SAVED
;
2151 /* return the pointed type of t */
2152 static inline CType
*pointed_type(CType
*type
)
2154 return &type
->ref
->type
;
2157 /* modify type so that its it is a pointer to type. */
2158 ST_FUNC
void mk_pointer(CType
*type
)
2161 s
= sym_push(SYM_FIELD
, type
, 0, -1);
2162 type
->t
= VT_PTR
| (type
->t
& ~VT_TYPE
);
2166 /* compare function types. OLD functions match any new functions */
2167 static int is_compatible_func(CType
*type1
, CType
*type2
)
2173 if (!is_compatible_types(&s1
->type
, &s2
->type
))
2175 /* check func_call */
2176 if (s1
->a
.func_call
!= s2
->a
.func_call
)
2178 /* XXX: not complete */
2179 if (s1
->c
== FUNC_OLD
|| s2
->c
== FUNC_OLD
)
2183 while (s1
!= NULL
) {
2186 if (!is_compatible_parameter_types(&s1
->type
, &s2
->type
))
2196 /* return true if type1 and type2 are the same. If unqualified is
2197 true, qualifiers on the types are ignored.
2199 - enums are not checked as gcc __builtin_types_compatible_p ()
2201 static int compare_types(CType
*type1
, CType
*type2
, int unqualified
)
2205 t1
= type1
->t
& VT_TYPE
;
2206 t2
= type2
->t
& VT_TYPE
;
2208 /* strip qualifiers before comparing */
2209 t1
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2210 t2
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2212 /* XXX: bitfields ? */
2215 /* test more complicated cases */
2216 bt1
= t1
& VT_BTYPE
;
2217 if (bt1
== VT_PTR
) {
2218 type1
= pointed_type(type1
);
2219 type2
= pointed_type(type2
);
2220 return is_compatible_types(type1
, type2
);
2221 } else if (bt1
== VT_STRUCT
) {
2222 return (type1
->ref
== type2
->ref
);
2223 } else if (bt1
== VT_FUNC
) {
2224 return is_compatible_func(type1
, type2
);
2230 /* return true if type1 and type2 are exactly the same (including
2233 static int is_compatible_types(CType
*type1
, CType
*type2
)
2235 return compare_types(type1
,type2
,0);
2238 /* return true if type1 and type2 are the same (ignoring qualifiers).
2240 static int is_compatible_parameter_types(CType
*type1
, CType
*type2
)
2242 return compare_types(type1
,type2
,1);
2245 /* print a type. If 'varstr' is not NULL, then the variable is also
2246 printed in the type */
2248 /* XXX: add array and function pointers */
2249 static void type_to_str(char *buf
, int buf_size
,
2250 CType
*type
, const char *varstr
)
2257 t
= type
->t
& VT_TYPE
;
2260 if (t
& VT_CONSTANT
)
2261 pstrcat(buf
, buf_size
, "const ");
2262 if (t
& VT_VOLATILE
)
2263 pstrcat(buf
, buf_size
, "volatile ");
2264 if (t
& VT_UNSIGNED
)
2265 pstrcat(buf
, buf_size
, "unsigned ");
2295 tstr
= "long double";
2297 pstrcat(buf
, buf_size
, tstr
);
2301 if (bt
== VT_STRUCT
)
2305 pstrcat(buf
, buf_size
, tstr
);
2306 v
= type
->ref
->v
& ~SYM_STRUCT
;
2307 if (v
>= SYM_FIRST_ANOM
)
2308 pstrcat(buf
, buf_size
, "<anonymous>");
2310 pstrcat(buf
, buf_size
, get_tok_str(v
, NULL
));
2314 type_to_str(buf
, buf_size
, &s
->type
, varstr
);
2315 pstrcat(buf
, buf_size
, "(");
2317 while (sa
!= NULL
) {
2318 type_to_str(buf1
, sizeof(buf1
), &sa
->type
, NULL
);
2319 pstrcat(buf
, buf_size
, buf1
);
2322 pstrcat(buf
, buf_size
, ", ");
2324 pstrcat(buf
, buf_size
, ")");
2328 pstrcpy(buf1
, sizeof(buf1
), "*");
2330 pstrcat(buf1
, sizeof(buf1
), varstr
);
2331 type_to_str(buf
, buf_size
, &s
->type
, buf1
);
2335 pstrcat(buf
, buf_size
, " ");
2336 pstrcat(buf
, buf_size
, varstr
);
2341 /* verify type compatibility to store vtop in 'dt' type, and generate
2343 static void gen_assign_cast(CType
*dt
)
2345 CType
*st
, *type1
, *type2
, tmp_type1
, tmp_type2
;
2346 char buf1
[256], buf2
[256];
2349 st
= &vtop
->type
; /* source type */
2350 dbt
= dt
->t
& VT_BTYPE
;
2351 sbt
= st
->t
& VT_BTYPE
;
2352 if (sbt
== VT_VOID
|| dbt
== VT_VOID
)
2353 tcc_error("cannot cast from/to void");
2354 if (dt
->t
& VT_CONSTANT
)
2355 tcc_warning("assignment of read-only location");
2358 /* special cases for pointers */
2359 /* '0' can also be a pointer */
2360 if (is_null_pointer(vtop
))
2362 /* accept implicit pointer to integer cast with warning */
2363 if (is_integer_btype(sbt
)) {
2364 tcc_warning("assignment makes pointer from integer without a cast");
2367 type1
= pointed_type(dt
);
2368 /* a function is implicitely a function pointer */
2369 if (sbt
== VT_FUNC
) {
2370 if ((type1
->t
& VT_BTYPE
) != VT_VOID
&&
2371 !is_compatible_types(pointed_type(dt
), st
))
2372 tcc_warning("assignment from incompatible pointer type");
2377 type2
= pointed_type(st
);
2378 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
2379 (type2
->t
& VT_BTYPE
) == VT_VOID
) {
2380 /* void * can match anything */
2382 /* exact type match, except for unsigned */
2385 tmp_type1
.t
&= ~(VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
2386 tmp_type2
.t
&= ~(VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
2387 if (!is_compatible_types(&tmp_type1
, &tmp_type2
))
2388 tcc_warning("assignment from incompatible pointer type");
2390 /* check const and volatile */
2391 if ((!(type1
->t
& VT_CONSTANT
) && (type2
->t
& VT_CONSTANT
)) ||
2392 (!(type1
->t
& VT_VOLATILE
) && (type2
->t
& VT_VOLATILE
)))
2393 tcc_warning("assignment discards qualifiers from pointer target type");
2399 if (sbt
== VT_PTR
|| sbt
== VT_FUNC
) {
2400 tcc_warning("assignment makes integer from pointer without a cast");
2402 /* XXX: more tests */
2407 tmp_type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2408 tmp_type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2409 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
2411 type_to_str(buf1
, sizeof(buf1
), st
, NULL
);
2412 type_to_str(buf2
, sizeof(buf2
), dt
, NULL
);
2413 tcc_error("cannot cast '%s' to '%s'", buf1
, buf2
);
2421 /* store vtop in lvalue pushed on stack */
2422 ST_FUNC
void vstore(void)
2424 int sbt
, dbt
, ft
, r
, t
, size
, align
, bit_size
, bit_pos
, rc
, delayed_cast
;
2426 ft
= vtop
[-1].type
.t
;
2427 sbt
= vtop
->type
.t
& VT_BTYPE
;
2428 dbt
= ft
& VT_BTYPE
;
2429 if ((((sbt
== VT_INT
|| sbt
== VT_SHORT
) && dbt
== VT_BYTE
) ||
2430 (sbt
== VT_INT
&& dbt
== VT_SHORT
))
2431 && !(vtop
->type
.t
& VT_BITFIELD
)) {
2432 /* optimize char/short casts */
2433 delayed_cast
= VT_MUSTCAST
;
2434 vtop
->type
.t
= ft
& (VT_TYPE
& ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
)));
2435 /* XXX: factorize */
2436 if (ft
& VT_CONSTANT
)
2437 tcc_warning("assignment of read-only location");
2440 if (!(ft
& VT_BITFIELD
))
2441 gen_assign_cast(&vtop
[-1].type
);
2444 if (sbt
== VT_STRUCT
) {
2445 /* if structure, only generate pointer */
2446 /* structure assignment : generate memcpy */
2447 /* XXX: optimize if small size */
2448 if (!nocode_wanted
) {
2449 size
= type_size(&vtop
->type
, &align
);
2453 vtop
->type
.t
= VT_PTR
;
2456 /* address of memcpy() */
2459 vpush_global_sym(&func_old_type
, TOK_memcpy8
);
2460 else if(!(align
& 3))
2461 vpush_global_sym(&func_old_type
, TOK_memcpy4
);
2464 vpush_global_sym(&func_old_type
, TOK_memcpy
);
2469 vtop
->type
.t
= VT_PTR
;
2478 /* leave source on stack */
2479 } else if (ft
& VT_BITFIELD
) {
2480 /* bitfield store handling */
2481 bit_pos
= (ft
>> VT_STRUCT_SHIFT
) & 0x3f;
2482 bit_size
= (ft
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
2483 /* remove bit field info to avoid loops */
2484 vtop
[-1].type
.t
= ft
& ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
));
2486 /* duplicate source into other register */
2491 if((ft
& VT_BTYPE
) == VT_BOOL
) {
2492 gen_cast(&vtop
[-1].type
);
2493 vtop
[-1].type
.t
= (vtop
[-1].type
.t
& ~VT_BTYPE
) | (VT_BYTE
| VT_UNSIGNED
);
2496 /* duplicate destination */
2498 vtop
[-1] = vtop
[-2];
2500 /* mask and shift source */
2501 if((ft
& VT_BTYPE
) != VT_BOOL
) {
2502 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2503 vpushll((1ULL << bit_size
) - 1ULL);
2505 vpushi((1 << bit_size
) - 1);
2511 /* load destination, mask and or with source */
2513 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2514 vpushll(~(((1ULL << bit_size
) - 1ULL) << bit_pos
));
2516 vpushi(~(((1 << bit_size
) - 1) << bit_pos
));
2523 /* pop off shifted source from "duplicate source..." above */
2527 #ifdef CONFIG_TCC_BCHECK
2528 /* bound check case */
2529 if (vtop
[-1].r
& VT_MUSTBOUND
) {
2535 if (!nocode_wanted
) {
2539 #ifdef TCC_TARGET_X86_64
2540 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
2542 } else if ((ft
& VT_BTYPE
) == VT_QFLOAT
) {
2547 r
= gv(rc
); /* generate value */
2548 /* if lvalue was saved on stack, must read it */
2549 if ((vtop
[-1].r
& VT_VALMASK
) == VT_LLOCAL
) {
2551 t
= get_reg(RC_INT
);
2552 #ifdef TCC_TARGET_X86_64
2557 sv
.r
= VT_LOCAL
| VT_LVAL
;
2558 sv
.c
.ul
= vtop
[-1].c
.ul
;
2560 vtop
[-1].r
= t
| VT_LVAL
;
2562 /* two word case handling : store second register at word + 4 (or +8 for x86-64) */
2563 #ifdef TCC_TARGET_X86_64
2564 if (((ft
& VT_BTYPE
) == VT_QLONG
) || ((ft
& VT_BTYPE
) == VT_QFLOAT
)) {
2565 int addr_type
= VT_LLONG
, load_size
= 8, load_type
= ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) ? VT_LLONG
: VT_DOUBLE
;
2567 if ((ft
& VT_BTYPE
) == VT_LLONG
) {
2568 int addr_type
= VT_INT
, load_size
= 4, load_type
= VT_INT
;
2570 vtop
[-1].type
.t
= load_type
;
2573 /* convert to int to increment easily */
2574 vtop
->type
.t
= addr_type
;
2580 vtop
[-1].type
.t
= load_type
;
2581 /* XXX: it works because r2 is spilled last ! */
2582 store(vtop
->r2
, vtop
- 1);
2588 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
2589 vtop
->r
|= delayed_cast
;
2593 /* post defines POST/PRE add. c is the token ++ or -- */
2594 ST_FUNC
void inc(int post
, int c
)
2597 vdup(); /* save lvalue */
2599 gv_dup(); /* duplicate value */
2604 vpushi(c
- TOK_MID
);
2606 vstore(); /* store value */
2608 vpop(); /* if post op, return saved value */
2611 /* Parse GNUC __attribute__ extension. Currently, the following
2612 extensions are recognized:
2613 - aligned(n) : set data/function alignment.
2614 - packed : force data alignment to 1
2615 - section(x) : generate data/code in this section.
2616 - unused : currently ignored, but may be used someday.
2617 - regparm(n) : pass function parameters in registers (i386 only)
2619 static void parse_attribute(AttributeDef
*ad
)
2623 while (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
) {
2627 while (tok
!= ')') {
2628 if (tok
< TOK_IDENT
)
2629 expect("attribute name");
2637 expect("section name");
2638 ad
->section
= find_section(tcc_state
, (char *)tokc
.cstr
->data
);
2646 expect("alias(\"target\")");
2647 ad
->alias_target
= /* save string as token, for later */
2648 tok_alloc((char*)tokc
.cstr
->data
, tokc
.cstr
->size
-1)->tok
;
2657 if (n
<= 0 || (n
& (n
- 1)) != 0)
2658 tcc_error("alignment must be a positive power of two");
2675 /* currently, no need to handle it because tcc does not
2676 track unused objects */
2680 /* currently, no need to handle it because tcc does not
2681 track unused objects */
2686 ad
->a
.func_call
= FUNC_CDECL
;
2691 ad
->a
.func_call
= FUNC_STDCALL
;
2693 #ifdef TCC_TARGET_I386
2703 ad
->a
.func_call
= FUNC_FASTCALL1
+ n
- 1;
2709 ad
->a
.func_call
= FUNC_FASTCALLW
;
2716 ad
->a
.mode
= VT_LLONG
+ 1;
2719 ad
->a
.mode
= VT_SHORT
+ 1;
2722 ad
->a
.mode
= VT_INT
+ 1;
2725 tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok
, NULL
));
2732 ad
->a
.func_export
= 1;
2735 ad
->a
.func_import
= 1;
2738 if (tcc_state
->warn_unsupported
)
2739 tcc_warning("'%s' attribute ignored", get_tok_str(t
, NULL
));
2740 /* skip parameters */
2742 int parenthesis
= 0;
2746 else if (tok
== ')')
2749 } while (parenthesis
&& tok
!= -1);
2762 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
2763 static void struct_decl(CType
*type
, int u
, int tdef
)
2765 int a
, v
, size
, align
, maxalign
, c
, offset
, flexible
;
2766 int bit_size
, bit_pos
, bsize
, bt
, lbit_pos
, prevbt
;
2767 Sym
*s
, *ss
, *ass
, **ps
;
2771 a
= tok
; /* save decl type */
2776 /* struct already defined ? return it */
2778 expect("struct/union/enum name");
2782 tcc_error("invalid type");
2784 } else if (tok
>= TOK_IDENT
&& !tdef
)
2785 tcc_error("unknown struct/union/enum");
2791 /* we put an undefined size for struct/union */
2792 s
= sym_push(v
| SYM_STRUCT
, &type1
, 0, -1);
2793 s
->r
= 0; /* default alignment is zero as gcc */
2794 /* put struct/union/enum name in type */
2802 tcc_error("struct/union/enum already defined");
2803 /* cannot be empty */
2805 /* non empty enums are not allowed */
2806 if (a
== TOK_ENUM
) {
2810 expect("identifier");
2813 tcc_error("redefinition of enumerator '%s'",
2814 get_tok_str(v
, NULL
));
2820 /* enum symbols have static storage */
2821 ss
= sym_push(v
, &int_type
, VT_CONST
, c
);
2822 ss
->type
.t
|= VT_STATIC
;
2827 /* NOTE: we accept a trailing comma */
2831 s
->c
= type_size(&int_type
, &align
);
2840 while (tok
!= '}') {
2841 parse_btype(&btype
, &ad
);
2844 tcc_error("flexible array member '%s' not at the end of struct",
2845 get_tok_str(v
, NULL
));
2850 type_decl(&type1
, &ad
, &v
, TYPE_DIRECT
| TYPE_ABSTRACT
);
2851 if (v
== 0 && (type1
.t
& VT_BTYPE
) != VT_STRUCT
)
2852 expect("identifier");
2853 if (type_size(&type1
, &align
) < 0) {
2854 if ((a
== TOK_STRUCT
) && (type1
.t
& VT_ARRAY
) && c
)
2857 tcc_error("field '%s' has incomplete type",
2858 get_tok_str(v
, NULL
));
2860 if ((type1
.t
& VT_BTYPE
) == VT_FUNC
||
2861 (type1
.t
& (VT_TYPEDEF
| VT_STATIC
| VT_EXTERN
| VT_INLINE
)))
2862 tcc_error("invalid type for '%s'",
2863 get_tok_str(v
, NULL
));
2867 bit_size
= expr_const();
2868 /* XXX: handle v = 0 case for messages */
2870 tcc_error("negative width in bit-field '%s'",
2871 get_tok_str(v
, NULL
));
2872 if (v
&& bit_size
== 0)
2873 tcc_error("zero width for bit-field '%s'",
2874 get_tok_str(v
, NULL
));
2876 size
= type_size(&type1
, &align
);
2878 if (align
< ad
.a
.aligned
)
2879 align
= ad
.a
.aligned
;
2880 } else if (ad
.a
.packed
) {
2882 } else if (*tcc_state
->pack_stack_ptr
) {
2883 if (align
> *tcc_state
->pack_stack_ptr
)
2884 align
= *tcc_state
->pack_stack_ptr
;
2887 if (bit_size
>= 0) {
2888 bt
= type1
.t
& VT_BTYPE
;
2895 tcc_error("bitfields must have scalar type");
2897 if (bit_size
> bsize
) {
2898 tcc_error("width of '%s' exceeds its type",
2899 get_tok_str(v
, NULL
));
2900 } else if (bit_size
== bsize
) {
2901 /* no need for bit fields */
2903 } else if (bit_size
== 0) {
2904 /* XXX: what to do if only padding in a
2906 /* zero size: means to pad */
2909 /* we do not have enough room ?
2910 did the type change?
2912 if ((bit_pos
+ bit_size
) > bsize
||
2913 bt
!= prevbt
|| a
== TOK_UNION
)
2916 /* XXX: handle LSB first */
2917 type1
.t
|= VT_BITFIELD
|
2918 (bit_pos
<< VT_STRUCT_SHIFT
) |
2919 (bit_size
<< (VT_STRUCT_SHIFT
+ 6));
2920 bit_pos
+= bit_size
;
2926 if (v
!= 0 || (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
2927 /* add new memory data only if starting
2929 if (lbit_pos
== 0) {
2930 if (a
== TOK_STRUCT
) {
2931 c
= (c
+ align
- 1) & -align
;
2940 if (align
> maxalign
)
2944 printf("add field %s offset=%d",
2945 get_tok_str(v
, NULL
), offset
);
2946 if (type1
.t
& VT_BITFIELD
) {
2947 printf(" pos=%d size=%d",
2948 (type1
.t
>> VT_STRUCT_SHIFT
) & 0x3f,
2949 (type1
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f);
2954 if (v
== 0 && (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
2956 while ((ass
= ass
->next
) != NULL
) {
2957 ss
= sym_push(ass
->v
, &ass
->type
, 0, offset
+ ass
->c
);
2962 ss
= sym_push(v
| SYM_FIELD
, &type1
, 0, offset
);
2966 if (tok
== ';' || tok
== TOK_EOF
)
2973 /* store size and alignment */
2974 s
->c
= (c
+ maxalign
- 1) & -maxalign
;
2980 /* return 0 if no type declaration. otherwise, return the basic type
2983 static int parse_btype(CType
*type
, AttributeDef
*ad
)
2985 int t
, u
, type_found
, typespec_found
, typedef_found
;
2989 memset(ad
, 0, sizeof(AttributeDef
));
2997 /* currently, we really ignore extension */
3007 if ((t
& VT_BTYPE
) != 0)
3008 tcc_error("too many basic types");
3024 if ((t
& VT_BTYPE
) == VT_DOUBLE
) {
3025 #ifndef TCC_TARGET_PE
3026 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3028 } else if ((t
& VT_BTYPE
) == VT_LONG
) {
3029 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3043 if ((t
& VT_BTYPE
) == VT_LONG
) {
3044 #ifdef TCC_TARGET_PE
3045 t
= (t
& ~VT_BTYPE
) | VT_DOUBLE
;
3047 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3055 struct_decl(&type1
, VT_ENUM
, t
& VT_TYPEDEF
);
3058 type
->ref
= type1
.ref
;
3062 struct_decl(&type1
, VT_STRUCT
, t
& VT_TYPEDEF
);
3065 /* type modifiers */
3118 /* GNUC attribute */
3119 case TOK_ATTRIBUTE1
:
3120 case TOK_ATTRIBUTE2
:
3121 parse_attribute(ad
);
3124 t
= (t
& ~VT_BTYPE
) | u
;
3132 parse_expr_type(&type1
);
3133 /* remove all storage modifiers except typedef */
3134 type1
.t
&= ~(VT_STORAGE
&~VT_TYPEDEF
);
3137 if (typespec_found
|| typedef_found
)
3140 if (!s
|| !(s
->type
.t
& VT_TYPEDEF
))
3143 t
|= (s
->type
.t
& ~VT_TYPEDEF
);
3144 type
->ref
= s
->type
.ref
;
3146 /* get attributes from typedef */
3147 if (0 == ad
->a
.aligned
)
3148 ad
->a
.aligned
= s
->a
.aligned
;
3149 if (0 == ad
->a
.func_call
)
3150 ad
->a
.func_call
= s
->a
.func_call
;
3151 ad
->a
.packed
|= s
->a
.packed
;
3160 if ((t
& (VT_SIGNED
|VT_UNSIGNED
)) == (VT_SIGNED
|VT_UNSIGNED
))
3161 tcc_error("signed and unsigned modifier");
3162 if (tcc_state
->char_is_unsigned
) {
3163 if ((t
& (VT_SIGNED
|VT_UNSIGNED
|VT_BTYPE
)) == VT_BYTE
)
3168 /* long is never used as type */
3169 if ((t
& VT_BTYPE
) == VT_LONG
)
3170 #if !defined TCC_TARGET_X86_64 || defined TCC_TARGET_PE
3171 t
= (t
& ~VT_BTYPE
) | VT_INT
;
3173 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3179 /* convert a function parameter type (array to pointer and function to
3180 function pointer) */
3181 static inline void convert_parameter_type(CType
*pt
)
3183 /* remove const and volatile qualifiers (XXX: const could be used
3184 to indicate a const function parameter */
3185 pt
->t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3186 /* array must be transformed to pointer according to ANSI C */
3188 if ((pt
->t
& VT_BTYPE
) == VT_FUNC
) {
3193 ST_FUNC
void parse_asm_str(CString
*astr
)
3196 /* read the string */
3198 expect("string constant");
3200 while (tok
== TOK_STR
) {
3201 /* XXX: add \0 handling too ? */
3202 cstr_cat(astr
, tokc
.cstr
->data
);
3205 cstr_ccat(astr
, '\0');
3208 /* Parse an asm label and return the label
3209 * Don't forget to free the CString in the caller! */
3210 static void asm_label_instr(CString
*astr
)
3213 parse_asm_str(astr
);
3216 printf("asm_alias: \"%s\"\n", (char *)astr
->data
);
3220 static void post_type(CType
*type
, AttributeDef
*ad
)
3222 int n
, l
, t1
, arg_size
, align
;
3223 Sym
**plast
, *s
, *first
;
3228 /* function declaration */
3236 /* read param name and compute offset */
3237 if (l
!= FUNC_OLD
) {
3238 if (!parse_btype(&pt
, &ad1
)) {
3240 tcc_error("invalid type");
3247 if ((pt
.t
& VT_BTYPE
) == VT_VOID
&& tok
== ')')
3249 type_decl(&pt
, &ad1
, &n
, TYPE_DIRECT
| TYPE_ABSTRACT
);
3250 if ((pt
.t
& VT_BTYPE
) == VT_VOID
)
3251 tcc_error("parameter declared as void");
3252 arg_size
+= (type_size(&pt
, &align
) + PTR_SIZE
- 1) / PTR_SIZE
;
3257 expect("identifier");
3261 convert_parameter_type(&pt
);
3262 s
= sym_push(n
| SYM_FIELD
, &pt
, 0, 0);
3268 if (l
== FUNC_NEW
&& tok
== TOK_DOTS
) {
3275 /* if no parameters, then old type prototype */
3279 /* NOTE: const is ignored in returned type as it has a special
3280 meaning in gcc / C++ */
3281 type
->t
&= ~VT_CONSTANT
;
3282 /* some ancient pre-K&R C allows a function to return an array
3283 and the array brackets to be put after the arguments, such
3284 that "int c()[]" means something like "int[] c()" */
3287 skip(']'); /* only handle simple "[]" */
3290 /* we push a anonymous symbol which will contain the function prototype */
3291 ad
->a
.func_args
= arg_size
;
3292 s
= sym_push(SYM_FIELD
, type
, 0, l
);
3297 } else if (tok
== '[') {
3298 /* array definition */
3300 if (tok
== TOK_RESTRICT1
)
3305 if (!local_stack
|| nocode_wanted
)
3306 vpushi(expr_const());
3308 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3311 tcc_error("invalid array size");
3313 if (!is_integer_btype(vtop
->type
.t
& VT_BTYPE
))
3314 tcc_error("size of variable length array should be an integer");
3319 /* parse next post type */
3320 post_type(type
, ad
);
3321 if (type
->t
== VT_FUNC
)
3322 tcc_error("declaration of an array of functions");
3323 t1
|= type
->t
& VT_VLA
;
3326 loc
-= type_size(&int_type
, &align
);
3330 vla_runtime_type_size(type
, &align
);
3332 vset(&int_type
, VT_LOCAL
|VT_LVAL
, loc
);
3339 /* we push an anonymous symbol which will contain the array
3341 s
= sym_push(SYM_FIELD
, type
, 0, n
);
3342 type
->t
= (t1
? VT_VLA
: VT_ARRAY
) | VT_PTR
;
3347 /* Parse a type declaration (except basic type), and return the type
3348 in 'type'. 'td' is a bitmask indicating which kind of type decl is
3349 expected. 'type' should contain the basic type. 'ad' is the
3350 attribute definition of the basic type. It can be modified by
3353 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
)
3356 CType type1
, *type2
;
3357 int qualifiers
, storage
;
3359 while (tok
== '*') {
3367 qualifiers
|= VT_CONSTANT
;
3372 qualifiers
|= VT_VOLATILE
;
3380 type
->t
|= qualifiers
;
3383 /* XXX: clarify attribute handling */
3384 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3385 parse_attribute(ad
);
3387 /* recursive type */
3388 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
3389 type1
.t
= 0; /* XXX: same as int */
3392 /* XXX: this is not correct to modify 'ad' at this point, but
3393 the syntax is not clear */
3394 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3395 parse_attribute(ad
);
3396 type_decl(&type1
, ad
, v
, td
);
3399 /* type identifier */
3400 if (tok
>= TOK_IDENT
&& (td
& TYPE_DIRECT
)) {
3404 if (!(td
& TYPE_ABSTRACT
))
3405 expect("identifier");
3409 storage
= type
->t
& VT_STORAGE
;
3410 type
->t
&= ~VT_STORAGE
;
3411 if (storage
& VT_STATIC
) {
3412 int saved_nocode_wanted
= nocode_wanted
;
3414 post_type(type
, ad
);
3415 nocode_wanted
= saved_nocode_wanted
;
3417 post_type(type
, ad
);
3419 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3420 parse_attribute(ad
);
3424 /* append type at the end of type1 */
3437 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
3438 ST_FUNC
int lvalue_type(int t
)
3443 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
3445 else if (bt
== VT_SHORT
)
3449 if (t
& VT_UNSIGNED
)
3450 r
|= VT_LVAL_UNSIGNED
;
3454 /* indirection with full error checking and bound check */
3455 ST_FUNC
void indir(void)
3457 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
) {
3458 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FUNC
)
3462 if ((vtop
->r
& VT_LVAL
) && !nocode_wanted
)
3464 vtop
->type
= *pointed_type(&vtop
->type
);
3465 /* Arrays and functions are never lvalues */
3466 if (!(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_VLA
)
3467 && (vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
3468 vtop
->r
|= lvalue_type(vtop
->type
.t
);
3469 /* if bound checking, the referenced pointer must be checked */
3470 #ifdef CONFIG_TCC_BCHECK
3471 if (tcc_state
->do_bounds_check
)
3472 vtop
->r
|= VT_MUSTBOUND
;
3477 /* pass a parameter to a function and do type checking and casting */
3478 static void gfunc_param_typed(Sym
*func
, Sym
*arg
)
3483 func_type
= func
->c
;
3484 if (func_type
== FUNC_OLD
||
3485 (func_type
== FUNC_ELLIPSIS
&& arg
== NULL
)) {
3486 /* default casting : only need to convert float to double */
3487 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
) {
3491 } else if (arg
== NULL
) {
3492 tcc_error("too many arguments to function");
3495 type
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
3496 gen_assign_cast(&type
);
3500 /* parse an expression of the form '(type)' or '(expr)' and return its
3502 static void parse_expr_type(CType
*type
)
3508 if (parse_btype(type
, &ad
)) {
3509 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3516 static void parse_type(CType
*type
)
3521 if (!parse_btype(type
, &ad
)) {
3524 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3527 static void vpush_tokc(int t
)
3532 vsetc(&type
, VT_CONST
, &tokc
);
3535 ST_FUNC
void unary(void)
3537 int n
, t
, align
, size
, r
, sizeof_caller
;
3541 static int in_sizeof
= 0;
3543 sizeof_caller
= in_sizeof
;
3545 /* XXX: GCC 2.95.3 does not generate a table although it should be
3559 vpush_tokc(VT_INT
| VT_UNSIGNED
);
3563 vpush_tokc(VT_LLONG
);
3567 vpush_tokc(VT_LLONG
| VT_UNSIGNED
);
3571 vpush_tokc(VT_FLOAT
);
3575 vpush_tokc(VT_DOUBLE
);
3579 vpush_tokc(VT_LDOUBLE
);
3582 case TOK___FUNCTION__
:
3584 goto tok_identifier
;
3590 /* special function name identifier */
3591 len
= strlen(funcname
) + 1;
3592 /* generate char[len] type */
3597 vpush_ref(&type
, data_section
, data_section
->data_offset
, len
);
3598 ptr
= section_ptr_add(data_section
, len
);
3599 memcpy(ptr
, funcname
, len
);
3604 #ifdef TCC_TARGET_PE
3605 t
= VT_SHORT
| VT_UNSIGNED
;
3611 /* string parsing */
3614 if (tcc_state
->warn_write_strings
)
3619 memset(&ad
, 0, sizeof(AttributeDef
));
3620 decl_initializer_alloc(&type
, &ad
, VT_CONST
, 2, 0, NULL
, 0);
3625 if (parse_btype(&type
, &ad
)) {
3626 type_decl(&type
, &ad
, &n
, TYPE_ABSTRACT
);
3628 /* check ISOC99 compound literal */
3630 /* data is allocated locally by default */
3635 /* all except arrays are lvalues */
3636 if (!(type
.t
& VT_ARRAY
))
3637 r
|= lvalue_type(type
.t
);
3638 memset(&ad
, 0, sizeof(AttributeDef
));
3639 decl_initializer_alloc(&type
, &ad
, r
, 1, 0, NULL
, 0);
3641 if (sizeof_caller
) {
3648 } else if (tok
== '{') {
3649 /* save all registers */
3651 /* statement expression : we do not accept break/continue
3652 inside as GCC does */
3653 block(NULL
, NULL
, NULL
, NULL
, 0, 1);
3668 /* functions names must be treated as function pointers,
3669 except for unary '&' and sizeof. Since we consider that
3670 functions are not lvalues, we only have to handle it
3671 there and in function calls. */
3672 /* arrays can also be used although they are not lvalues */
3673 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
&&
3674 !(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_LLOCAL
))
3676 mk_pointer(&vtop
->type
);
3682 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3684 boolean
.t
= VT_BOOL
;
3686 vtop
->c
.i
= !vtop
->c
.i
;
3687 } else if ((vtop
->r
& VT_VALMASK
) == VT_CMP
)
3688 vtop
->c
.i
= vtop
->c
.i
^ 1;
3691 vseti(VT_JMP
, gvtst(1, 0));
3702 /* in order to force cast, we add zero */
3704 if ((vtop
->type
.t
& VT_BTYPE
) == VT_PTR
)
3705 tcc_error("pointer not accepted for unary plus");
3715 unary_type(&type
); // Perform a in_sizeof = 0;
3716 size
= type_size(&type
, &align
);
3717 if (t
== TOK_SIZEOF
) {
3718 if (!(type
.t
& VT_VLA
)) {
3720 tcc_error("sizeof applied to an incomplete type");
3723 vla_runtime_type_size(&type
, &align
);
3728 vtop
->type
.t
|= VT_UNSIGNED
;
3731 case TOK_builtin_types_compatible_p
:
3740 type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3741 type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3742 vpushi(is_compatible_types(&type1
, &type2
));
3745 case TOK_builtin_constant_p
:
3747 int saved_nocode_wanted
, res
;
3750 saved_nocode_wanted
= nocode_wanted
;
3753 res
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
3755 nocode_wanted
= saved_nocode_wanted
;
3760 case TOK_builtin_frame_address
:
3766 if (tok
!= TOK_CINT
|| tokc
.i
< 0) {
3767 tcc_error("__builtin_frame_address only takes positive integers");
3774 vset(&type
, VT_LOCAL
, 0); /* local frame */
3776 mk_pointer(&vtop
->type
);
3777 indir(); /* -> parent frame */
3781 #ifdef TCC_TARGET_X86_64
3782 #ifdef TCC_TARGET_PE
3783 case TOK_builtin_va_start
:
3791 if ((vtop
->r
& VT_VALMASK
) != VT_LOCAL
)
3792 tcc_error("__builtin_va_start expects a local variable");
3793 vtop
->r
&= ~(VT_LVAL
| VT_REF
);
3794 vtop
->type
= char_pointer_type
;
3799 case TOK_builtin_va_arg_types
:
3806 vpushi(classify_x86_64_va_arg(&type
));
3821 t
= vtop
->type
.t
& VT_BTYPE
;
3823 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
&&
3826 vtop
->c
.f
= -vtop
->c
.f
;
3827 else if (t
== VT_DOUBLE
)
3828 vtop
->c
.d
= -vtop
->c
.d
;
3830 vtop
->c
.ld
= -vtop
->c
.ld
;
3839 goto tok_identifier
;
3841 /* allow to take the address of a label */
3842 if (tok
< TOK_UIDENT
)
3843 expect("label identifier");
3844 s
= label_find(tok
);
3846 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
3848 if (s
->r
== LABEL_DECLARED
)
3849 s
->r
= LABEL_FORWARD
;
3852 s
->type
.t
= VT_VOID
;
3853 mk_pointer(&s
->type
);
3854 s
->type
.t
|= VT_STATIC
;
3856 vset(&s
->type
, VT_CONST
| VT_SYM
, 0);
3861 // special qnan , snan and infinity values
3863 vpush64(VT_DOUBLE
, 0x7ff8000000000000ULL
);
3867 vpush64(VT_DOUBLE
, 0x7ff0000000000001ULL
);
3871 vpush64(VT_DOUBLE
, 0x7ff0000000000000ULL
);
3880 expect("identifier");
3884 tcc_error("'%s' undeclared", get_tok_str(t
, NULL
));
3885 /* for simple function calls, we tolerate undeclared
3886 external reference to int() function */
3887 if (tcc_state
->warn_implicit_function_declaration
)
3888 tcc_warning("implicit declaration of function '%s'",
3889 get_tok_str(t
, NULL
));
3890 s
= external_global_sym(t
, &func_old_type
, 0);
3892 if ((s
->type
.t
& (VT_STATIC
| VT_INLINE
| VT_BTYPE
)) ==
3893 (VT_STATIC
| VT_INLINE
| VT_FUNC
)) {
3894 /* if referencing an inline function, then we generate a
3895 symbol to it if not already done. It will have the
3896 effect to generate code for it at the end of the
3897 compilation unit. Inline function as always
3898 generated in the text section. */
3900 put_extern_sym(s
, text_section
, 0, 0);
3901 r
= VT_SYM
| VT_CONST
;
3905 vset(&s
->type
, r
, s
->c
);
3906 /* if forward reference, we must point to s */
3907 if (vtop
->r
& VT_SYM
) {
3914 /* post operations */
3916 if (tok
== TOK_INC
|| tok
== TOK_DEC
) {
3919 } else if (tok
== '.' || tok
== TOK_ARROW
) {
3922 if (tok
== TOK_ARROW
)
3924 qualifiers
= vtop
->type
.t
& (VT_CONSTANT
| VT_VOLATILE
);
3928 /* expect pointer on structure */
3929 if ((vtop
->type
.t
& VT_BTYPE
) != VT_STRUCT
)
3930 expect("struct or union");
3934 while ((s
= s
->next
) != NULL
) {
3939 tcc_error("field not found: %s", get_tok_str(tok
& ~SYM_FIELD
, NULL
));
3940 /* add field offset to pointer */
3941 vtop
->type
= char_pointer_type
; /* change type to 'char *' */
3944 /* change type to field type, and set to lvalue */
3945 vtop
->type
= s
->type
;
3946 vtop
->type
.t
|= qualifiers
;
3947 /* an array is never an lvalue */
3948 if (!(vtop
->type
.t
& VT_ARRAY
)) {
3949 vtop
->r
|= lvalue_type(vtop
->type
.t
);
3950 #ifdef CONFIG_TCC_BCHECK
3951 /* if bound checking, the referenced pointer must be checked */
3952 if (tcc_state
->do_bounds_check
)
3953 vtop
->r
|= VT_MUSTBOUND
;
3957 } else if (tok
== '[') {
3963 } else if (tok
== '(') {
3966 int nb_args
, ret_nregs
, ret_align
, variadic
;
3969 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
3970 /* pointer test (no array accepted) */
3971 if ((vtop
->type
.t
& (VT_BTYPE
| VT_ARRAY
)) == VT_PTR
) {
3972 vtop
->type
= *pointed_type(&vtop
->type
);
3973 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
)
3977 expect("function pointer");
3980 vtop
->r
&= ~VT_LVAL
; /* no lvalue */
3982 /* get return type */
3985 sa
= s
->next
; /* first parameter */
3988 /* compute first implicit argument if a structure is returned */
3989 if ((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
3990 variadic
= (s
->c
== FUNC_ELLIPSIS
);
3991 ret_nregs
= gfunc_sret(&s
->type
, variadic
, &ret
.type
,
3994 /* get some space for the returned structure */
3995 size
= type_size(&s
->type
, &align
);
3996 loc
= (loc
- size
) & -align
;
3998 ret
.r
= VT_LOCAL
| VT_LVAL
;
3999 /* pass it as 'int' to avoid structure arg passing
4001 vseti(VT_LOCAL
, loc
);
4011 /* return in register */
4012 if (is_float(ret
.type
.t
)) {
4013 ret
.r
= reg_fret(ret
.type
.t
);
4014 #ifdef TCC_TARGET_X86_64
4015 if ((ret
.type
.t
& VT_BTYPE
) == VT_QFLOAT
)
4019 #ifdef TCC_TARGET_X86_64
4020 if ((ret
.type
.t
& VT_BTYPE
) == VT_QLONG
)
4022 if ((ret
.type
.t
& VT_BTYPE
) == VT_LLONG
)
4032 gfunc_param_typed(s
, sa
);
4042 tcc_error("too few arguments to function");
4044 if (!nocode_wanted
) {
4045 gfunc_call(nb_args
);
4047 vtop
-= (nb_args
+ 1);
4051 for (r
= ret
.r
+ ret_nregs
+ !ret_nregs
; r
-- > ret
.r
;) {
4052 vsetc(&ret
.type
, r
, &ret
.c
);
4053 vtop
->r2
= ret
.r2
; /* Loop only happens when r2 is VT_CONST */
4056 /* handle packed struct return */
4057 if (((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) && ret_nregs
) {
4060 size
= type_size(&s
->type
, &align
);
4061 loc
= (loc
- size
) & -align
;
4065 vset(&ret
.type
, VT_LOCAL
| VT_LVAL
, addr
+ offset
);
4069 if (--ret_nregs
== 0)
4071 /* XXX: compatible with arm only: ret_align == register_size */
4072 offset
+= ret_align
;
4074 vset(&s
->type
, VT_LOCAL
| VT_LVAL
, addr
);
4082 ST_FUNC
void expr_prod(void)
4087 while (tok
== '*' || tok
== '/' || tok
== '%') {
4095 ST_FUNC
void expr_sum(void)
4100 while (tok
== '+' || tok
== '-') {
4108 static void expr_shift(void)
4113 while (tok
== TOK_SHL
|| tok
== TOK_SAR
) {
4121 static void expr_cmp(void)
4126 while ((tok
>= TOK_ULE
&& tok
<= TOK_GT
) ||
4127 tok
== TOK_ULT
|| tok
== TOK_UGE
) {
4135 static void expr_cmpeq(void)
4140 while (tok
== TOK_EQ
|| tok
== TOK_NE
) {
4148 static void expr_and(void)
4151 while (tok
== '&') {
4158 static void expr_xor(void)
4161 while (tok
== '^') {
4168 static void expr_or(void)
4171 while (tok
== '|') {
4178 /* XXX: fix this mess */
4179 static void expr_land_const(void)
4182 while (tok
== TOK_LAND
) {
4189 /* XXX: fix this mess */
4190 static void expr_lor_const(void)
4193 while (tok
== TOK_LOR
) {
4200 /* only used if non constant */
4201 static void expr_land(void)
4206 if (tok
== TOK_LAND
) {
4211 if (tok
!= TOK_LAND
) {
4221 static void expr_lor(void)
4226 if (tok
== TOK_LOR
) {
4231 if (tok
!= TOK_LOR
) {
4241 /* XXX: better constant handling */
4242 static void expr_cond(void)
4244 int tt
, u
, r1
, r2
, rc
, t1
, t2
, bt1
, bt2
;
4246 CType type
, type1
, type2
;
4253 boolean
.t
= VT_BOOL
;
4259 if (tok
!= ':' || !gnu_ext
) {
4274 if (vtop
!= vstack
) {
4275 /* needed to avoid having different registers saved in
4277 if (is_float(vtop
->type
.t
)) {
4279 #ifdef TCC_TARGET_X86_64
4280 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4290 if (tok
== ':' && gnu_ext
) {
4298 sv
= *vtop
; /* save value to handle it later */
4299 vtop
--; /* no vpop so that FP stack is not flushed */
4307 bt1
= t1
& VT_BTYPE
;
4309 bt2
= t2
& VT_BTYPE
;
4310 /* cast operands to correct type according to ISOC rules */
4311 if (is_float(bt1
) || is_float(bt2
)) {
4312 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
4313 type
.t
= VT_LDOUBLE
;
4314 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
4319 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
4320 /* cast to biggest op */
4322 /* convert to unsigned if it does not fit in a long long */
4323 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
4324 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
4325 type
.t
|= VT_UNSIGNED
;
4326 } else if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
4327 /* If one is a null ptr constant the result type
4329 if (is_null_pointer (vtop
))
4331 else if (is_null_pointer (&sv
))
4333 /* XXX: test pointer compatibility, C99 has more elaborate
4337 } else if (bt1
== VT_FUNC
|| bt2
== VT_FUNC
) {
4338 /* XXX: test function pointer compatibility */
4339 type
= bt1
== VT_FUNC
? type1
: type2
;
4340 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
4341 /* XXX: test structure compatibility */
4342 type
= bt1
== VT_STRUCT
? type1
: type2
;
4343 } else if (bt1
== VT_VOID
|| bt2
== VT_VOID
) {
4344 /* NOTE: as an extension, we accept void on only one side */
4347 /* integer operations */
4349 /* convert to unsigned if it does not fit in an integer */
4350 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
4351 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
4352 type
.t
|= VT_UNSIGNED
;
4355 /* now we convert second operand */
4357 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4360 if (is_float(type
.t
)) {
4362 #ifdef TCC_TARGET_X86_64
4363 if ((type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4367 } else if ((type
.t
& VT_BTYPE
) == VT_LLONG
) {
4368 /* for long longs, we use fixed registers to avoid having
4369 to handle a complicated move */
4374 /* this is horrible, but we must also convert first
4378 /* put again first value and cast it */
4381 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4384 move_reg(r2
, r1
, type
.t
);
4391 static void expr_eq(void)
4397 (tok
>= TOK_A_MOD
&& tok
<= TOK_A_DIV
) ||
4398 tok
== TOK_A_XOR
|| tok
== TOK_A_OR
||
4399 tok
== TOK_A_SHL
|| tok
== TOK_A_SAR
) {
4414 ST_FUNC
void gexpr(void)
4425 /* parse an expression and return its type without any side effect. */
4426 static void expr_type(CType
*type
)
4428 int saved_nocode_wanted
;
4430 saved_nocode_wanted
= nocode_wanted
;
4435 nocode_wanted
= saved_nocode_wanted
;
4438 /* parse a unary expression and return its type without any side
4440 static void unary_type(CType
*type
)
4452 /* parse a constant expression and return value in vtop. */
4453 static void expr_const1(void)
4462 /* parse an integer constant and return its value. */
4463 ST_FUNC
int expr_const(void)
4467 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
4468 expect("constant expression");
4474 /* return the label token if current token is a label, otherwise
4476 static int is_label(void)
4480 /* fast test first */
4481 if (tok
< TOK_UIDENT
)
4483 /* no need to save tokc because tok is an identifier */
4490 unget_tok(last_tok
);
4495 static void label_or_decl(int l
)
4499 /* fast test first */
4500 if (tok
>= TOK_UIDENT
)
4502 /* no need to save tokc because tok is an identifier */
4506 unget_tok(last_tok
);
4509 unget_tok(last_tok
);
4514 static void block(int *bsym
, int *csym
, int *case_sym
, int *def_sym
,
4515 int case_reg
, int is_expr
)
4518 Sym
*s
, *frame_bottom
;
4520 /* generate line number info */
4521 if (tcc_state
->do_debug
&&
4522 (last_line_num
!= file
->line_num
|| last_ind
!= ind
)) {
4523 put_stabn(N_SLINE
, 0, file
->line_num
, ind
- func_ind
);
4525 last_line_num
= file
->line_num
;
4529 /* default return value is (void) */
4531 vtop
->type
.t
= VT_VOID
;
4534 if (tok
== TOK_IF
) {
4541 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4543 if (c
== TOK_ELSE
) {
4547 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4548 gsym(d
); /* patch else jmp */
4551 } else if (tok
== TOK_WHILE
) {
4559 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4563 } else if (tok
== '{') {
4565 int block_vla_sp_loc
, *saved_vla_sp_loc
, saved_vla_flags
;
4568 /* record local declaration stack position */
4570 frame_bottom
= sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
4571 frame_bottom
->next
= scope_stack_bottom
;
4572 scope_stack_bottom
= frame_bottom
;
4573 llabel
= local_label_stack
;
4575 /* save VLA state */
4576 block_vla_sp_loc
= *(saved_vla_sp_loc
= vla_sp_loc
);
4577 if (saved_vla_sp_loc
!= &vla_sp_root_loc
)
4578 vla_sp_loc
= &block_vla_sp_loc
;
4580 saved_vla_flags
= vla_flags
;
4581 vla_flags
|= VLA_NEED_NEW_FRAME
;
4583 /* handle local labels declarations */
4584 if (tok
== TOK_LABEL
) {
4587 if (tok
< TOK_UIDENT
)
4588 expect("label identifier");
4589 label_push(&local_label_stack
, tok
, LABEL_DECLARED
);
4599 while (tok
!= '}') {
4600 label_or_decl(VT_LOCAL
);
4604 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
4607 /* pop locally defined labels */
4608 label_pop(&local_label_stack
, llabel
);
4610 /* XXX: this solution makes only valgrind happy...
4611 triggered by gcc.c-torture/execute/20000917-1.c */
4613 switch(vtop
->type
.t
& VT_BTYPE
) {
4618 for(p
=vtop
->type
.ref
;p
;p
=p
->prev
)
4620 tcc_error("unsupported expression type");
4623 /* pop locally defined symbols */
4624 scope_stack_bottom
= scope_stack_bottom
->next
;
4625 sym_pop(&local_stack
, s
);
4627 /* Pop VLA frames and restore stack pointer if required */
4628 if (saved_vla_sp_loc
!= &vla_sp_root_loc
)
4629 *saved_vla_sp_loc
= block_vla_sp_loc
;
4630 if (vla_sp_loc
!= (saved_vla_sp_loc
== &vla_sp_root_loc
? &vla_sp_root_loc
: &block_vla_sp_loc
)) {
4631 vla_sp_loc
= saved_vla_sp_loc
;
4632 gen_vla_sp_restore(*vla_sp_loc
);
4634 vla_flags
= (vla_flags
& ~VLA_SCOPE_FLAGS
) | (saved_vla_flags
& VLA_SCOPE_FLAGS
);
4637 } else if (tok
== TOK_RETURN
) {
4641 gen_assign_cast(&func_vt
);
4642 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
4643 CType type
, ret_type
;
4644 int ret_align
, ret_nregs
;
4645 ret_nregs
= gfunc_sret(&func_vt
, func_var
, &ret_type
,
4647 if (0 == ret_nregs
) {
4648 /* if returning structure, must copy it to implicit
4649 first pointer arg location */
4652 vset(&type
, VT_LOCAL
| VT_LVAL
, func_vc
);
4655 /* copy structure value to pointer */
4658 /* returning structure packed into registers */
4659 int r
, size
, addr
, align
;
4660 size
= type_size(&func_vt
,&align
);
4661 if ((vtop
->r
!= (VT_LOCAL
| VT_LVAL
) || (vtop
->c
.i
& (ret_align
-1)))
4662 && (align
& (ret_align
-1))) {
4663 loc
= (loc
- size
) & -align
;
4666 vset(&type
, VT_LOCAL
| VT_LVAL
, addr
);
4669 vset(&ret_type
, VT_LOCAL
| VT_LVAL
, addr
);
4671 vtop
->type
= ret_type
;
4672 if (is_float(ret_type
.t
))
4673 r
= rc_fret(ret_type
.t
);
4679 if (--ret_nregs
== 0)
4681 /* We assume that when a structure is returned in multiple
4682 registers, their classes are consecutive values of the
4685 /* XXX: compatible with arm only: ret_align == register_size */
4686 vtop
->c
.i
+= ret_align
;
4687 vtop
->r
= VT_LOCAL
| VT_LVAL
;
4690 } else if (is_float(func_vt
.t
)) {
4691 gv(rc_fret(func_vt
.t
));
4695 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
4698 rsym
= gjmp(rsym
); /* jmp */
4699 } else if (tok
== TOK_BREAK
) {
4702 tcc_error("cannot break");
4703 *bsym
= gjmp(*bsym
);
4706 } else if (tok
== TOK_CONTINUE
) {
4709 tcc_error("cannot continue");
4710 *csym
= gjmp(*csym
);
4713 } else if (tok
== TOK_FOR
) {
4718 frame_bottom
= sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
4719 frame_bottom
->next
= scope_stack_bottom
;
4720 scope_stack_bottom
= frame_bottom
;
4722 /* c99 for-loop init decl? */
4723 if (!decl0(VT_LOCAL
, 1)) {
4724 /* no, regular for-loop init expr */
4748 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4752 scope_stack_bottom
= scope_stack_bottom
->next
;
4753 sym_pop(&local_stack
, s
);
4755 if (tok
== TOK_DO
) {
4760 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4771 if (tok
== TOK_SWITCH
) {
4775 /* XXX: other types than integer */
4776 case_reg
= gv(RC_INT
);
4780 b
= gjmp(0); /* jump to first case */
4782 block(&a
, csym
, &b
, &c
, case_reg
, 0);
4783 /* if no default, jmp after switch */
4791 if (tok
== TOK_CASE
) {
4798 if (gnu_ext
&& tok
== TOK_DOTS
) {
4802 tcc_warning("empty case range");
4804 /* since a case is like a label, we must skip it with a jmp */
4811 *case_sym
= gtst(1, 0);
4814 *case_sym
= gtst(1, 0);
4818 *case_sym
= gtst(1, *case_sym
);
4823 goto block_after_label
;
4825 if (tok
== TOK_DEFAULT
) {
4831 tcc_error("too many 'default'");
4834 goto block_after_label
;
4836 if (tok
== TOK_GOTO
) {
4838 if (tok
== '*' && gnu_ext
) {
4842 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
)
4845 } else if (tok
>= TOK_UIDENT
) {
4846 s
= label_find(tok
);
4847 /* put forward definition if needed */
4849 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
4851 if (s
->r
== LABEL_DECLARED
)
4852 s
->r
= LABEL_FORWARD
;
4854 /* label already defined */
4855 if (vla_flags
& VLA_IN_SCOPE
) {
4856 /* If VLAs are in use, save the current stack pointer and
4857 reset the stack pointer to what it was at function entry
4858 (label will restore stack pointer in inner scopes) */
4860 gen_vla_sp_restore(vla_sp_root_loc
);
4862 if (s
->r
& LABEL_FORWARD
)
4863 s
->jnext
= gjmp(s
->jnext
);
4865 gjmp_addr(s
->jnext
);
4868 expect("label identifier");
4871 } else if (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
) {
4877 if (vla_flags
& VLA_IN_SCOPE
) {
4878 /* save/restore stack pointer across label
4879 this is a no-op when combined with the load immediately
4880 after the label unless we arrive via goto */
4885 if (s
->r
== LABEL_DEFINED
)
4886 tcc_error("duplicate label '%s'", get_tok_str(s
->v
, NULL
));
4888 s
->r
= LABEL_DEFINED
;
4890 s
= label_push(&global_label_stack
, b
, LABEL_DEFINED
);
4893 if (vla_flags
& VLA_IN_SCOPE
) {
4894 gen_vla_sp_restore(*vla_sp_loc
);
4895 vla_flags
|= VLA_NEED_NEW_FRAME
;
4897 /* we accept this, but it is a mistake */
4900 tcc_warning("deprecated use of label at end of compound statement");
4904 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
4907 /* expression case */
4922 /* t is the array or struct type. c is the array or struct
4923 address. cur_index/cur_field is the pointer to the current
4924 value. 'size_only' is true if only size info is needed (only used
4926 static void decl_designator(CType
*type
, Section
*sec
, unsigned long c
,
4927 int *cur_index
, Sym
**cur_field
,
4931 int notfirst
, index
, index_last
, align
, l
, nb_elems
, elem_size
;
4937 if (gnu_ext
&& (l
= is_label()) != 0)
4939 while (tok
== '[' || tok
== '.') {
4941 if (!(type
->t
& VT_ARRAY
))
4942 expect("array type");
4945 index
= expr_const();
4946 if (index
< 0 || (s
->c
>= 0 && index
>= s
->c
))
4947 expect("invalid index");
4948 if (tok
== TOK_DOTS
&& gnu_ext
) {
4950 index_last
= expr_const();
4951 if (index_last
< 0 ||
4952 (s
->c
>= 0 && index_last
>= s
->c
) ||
4954 expect("invalid index");
4960 *cur_index
= index_last
;
4961 type
= pointed_type(type
);
4962 elem_size
= type_size(type
, &align
);
4963 c
+= index
* elem_size
;
4964 /* NOTE: we only support ranges for last designator */
4965 nb_elems
= index_last
- index
+ 1;
4966 if (nb_elems
!= 1) {
4975 if ((type
->t
& VT_BTYPE
) != VT_STRUCT
)
4976 expect("struct/union type");
4989 /* XXX: fix this mess by using explicit storage field */
4991 type1
.t
|= (type
->t
& ~VT_TYPE
);
5005 if (type
->t
& VT_ARRAY
) {
5007 type
= pointed_type(type
);
5008 c
+= index
* type_size(type
, &align
);
5012 tcc_error("too many field init");
5013 /* XXX: fix this mess by using explicit storage field */
5015 type1
.t
|= (type
->t
& ~VT_TYPE
);
5020 decl_initializer(type
, sec
, c
, 0, size_only
);
5022 /* XXX: make it more general */
5023 if (!size_only
&& nb_elems
> 1) {
5024 unsigned long c_end
;
5029 tcc_error("range init not supported yet for dynamic storage");
5030 c_end
= c
+ nb_elems
* elem_size
;
5031 if (c_end
> sec
->data_allocated
)
5032 section_realloc(sec
, c_end
);
5033 src
= sec
->data
+ c
;
5035 for(i
= 1; i
< nb_elems
; i
++) {
5037 memcpy(dst
, src
, elem_size
);
5043 #define EXPR_CONST 1
5046 /* store a value or an expression directly in global data or in local array */
5047 static void init_putv(CType
*type
, Section
*sec
, unsigned long c
,
5048 int v
, int expr_type
)
5050 int saved_global_expr
, bt
, bit_pos
, bit_size
;
5052 unsigned long long bit_mask
;
5060 /* compound literals must be allocated globally in this case */
5061 saved_global_expr
= global_expr
;
5064 global_expr
= saved_global_expr
;
5065 /* NOTE: symbols are accepted */
5066 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) != VT_CONST
)
5067 tcc_error("initializer element is not constant");
5075 dtype
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
5078 /* XXX: not portable */
5079 /* XXX: generate error if incorrect relocation */
5080 gen_assign_cast(&dtype
);
5081 bt
= type
->t
& VT_BTYPE
;
5082 /* we'll write at most 12 bytes */
5083 if (c
+ 12 > sec
->data_allocated
) {
5084 section_realloc(sec
, c
+ 12);
5086 ptr
= sec
->data
+ c
;
5087 /* XXX: make code faster ? */
5088 if (!(type
->t
& VT_BITFIELD
)) {
5093 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5094 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
5095 bit_mask
= (1LL << bit_size
) - 1;
5097 if ((vtop
->r
& VT_SYM
) &&
5103 (bt
== VT_INT
&& bit_size
!= 32)))
5104 tcc_error("initializer element is not computable at load time");
5107 vtop
->c
.i
= (vtop
->c
.i
!= 0);
5109 *(char *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5112 *(short *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5115 *(double *)ptr
= vtop
->c
.d
;
5118 *(long double *)ptr
= vtop
->c
.ld
;
5121 *(long long *)ptr
|= (vtop
->c
.ll
& bit_mask
) << bit_pos
;
5124 if (vtop
->r
& VT_SYM
) {
5125 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
5127 *(int *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5132 vset(&dtype
, VT_LOCAL
|VT_LVAL
, c
);
5139 /* put zeros for variable based init */
5140 static void init_putz(CType
*t
, Section
*sec
, unsigned long c
, int size
)
5143 /* nothing to do because globals are already set to zero */
5145 vpush_global_sym(&func_old_type
, TOK_memset
);
5153 /* 't' contains the type and storage info. 'c' is the offset of the
5154 object in section 'sec'. If 'sec' is NULL, it means stack based
5155 allocation. 'first' is true if array '{' must be read (multi
5156 dimension implicit array init handling). 'size_only' is true if
5157 size only evaluation is wanted (only for arrays). */
5158 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
,
5159 int first
, int size_only
)
5161 int index
, array_length
, n
, no_oblock
, nb
, parlevel
, parlevel1
, i
;
5162 int size1
, align1
, expr_type
;
5166 if (type
->t
& VT_VLA
) {
5169 /* save current stack pointer */
5170 if (vla_flags
& VLA_NEED_NEW_FRAME
) {
5172 vla_flags
= VLA_IN_SCOPE
;
5173 vla_sp_loc
= &vla_sp_loc_tmp
;
5176 vla_runtime_type_size(type
, &a
);
5177 gen_vla_alloc(type
, a
);
5178 vset(type
, VT_LOCAL
|VT_LVAL
, c
);
5182 } else if (type
->t
& VT_ARRAY
) {
5186 t1
= pointed_type(type
);
5187 size1
= type_size(t1
, &align1
);
5190 if ((first
&& tok
!= TOK_LSTR
&& tok
!= TOK_STR
) ||
5193 tcc_error("character array initializer must be a literal,"
5194 " optionally enclosed in braces");
5199 /* only parse strings here if correct type (otherwise: handle
5200 them as ((w)char *) expressions */
5201 if ((tok
== TOK_LSTR
&&
5202 #ifdef TCC_TARGET_PE
5203 (t1
->t
& VT_BTYPE
) == VT_SHORT
&& (t1
->t
& VT_UNSIGNED
)
5205 (t1
->t
& VT_BTYPE
) == VT_INT
5207 ) || (tok
== TOK_STR
&& (t1
->t
& VT_BTYPE
) == VT_BYTE
)) {
5208 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5213 /* compute maximum number of chars wanted */
5215 cstr_len
= cstr
->size
;
5217 cstr_len
= cstr
->size
/ sizeof(nwchar_t
);
5220 if (n
>= 0 && nb
> (n
- array_length
))
5221 nb
= n
- array_length
;
5224 tcc_warning("initializer-string for array is too long");
5225 /* in order to go faster for common case (char
5226 string in global variable, we handle it
5228 if (sec
&& tok
== TOK_STR
&& size1
== 1) {
5229 memcpy(sec
->data
+ c
+ array_length
, cstr
->data
, nb
);
5233 ch
= ((unsigned char *)cstr
->data
)[i
];
5235 ch
= ((nwchar_t
*)cstr
->data
)[i
];
5236 init_putv(t1
, sec
, c
+ (array_length
+ i
) * size1
,
5244 /* only add trailing zero if enough storage (no
5245 warning in this case since it is standard) */
5246 if (n
< 0 || array_length
< n
) {
5248 init_putv(t1
, sec
, c
+ (array_length
* size1
), 0, EXPR_VAL
);
5254 while (tok
!= '}') {
5255 decl_designator(type
, sec
, c
, &index
, NULL
, size_only
);
5256 if (n
>= 0 && index
>= n
)
5257 tcc_error("index too large");
5258 /* must put zero in holes (note that doing it that way
5259 ensures that it even works with designators) */
5260 if (!size_only
&& array_length
< index
) {
5261 init_putz(t1
, sec
, c
+ array_length
* size1
,
5262 (index
- array_length
) * size1
);
5265 if (index
> array_length
)
5266 array_length
= index
;
5267 /* special test for multi dimensional arrays (may not
5268 be strictly correct if designators are used at the
5270 if (index
>= n
&& no_oblock
)
5279 /* put zeros at the end */
5280 if (!size_only
&& n
>= 0 && array_length
< n
) {
5281 init_putz(t1
, sec
, c
+ array_length
* size1
,
5282 (n
- array_length
) * size1
);
5284 /* patch type size if needed */
5286 s
->c
= array_length
;
5287 } else if ((type
->t
& VT_BTYPE
) == VT_STRUCT
&&
5288 (sec
|| !first
|| tok
== '{')) {
5291 /* NOTE: the previous test is a specific case for automatic
5292 struct/union init */
5293 /* XXX: union needs only one init */
5295 /* XXX: this test is incorrect for local initializers
5296 beginning with ( without {. It would be much more difficult
5297 to do it correctly (ideally, the expression parser should
5298 be used in all cases) */
5304 while (tok
== '(') {
5308 if (!parse_btype(&type1
, &ad1
))
5310 type_decl(&type1
, &ad1
, &n
, TYPE_ABSTRACT
);
5312 if (!is_assignable_types(type
, &type1
))
5313 tcc_error("invalid type for cast");
5318 if (first
|| tok
== '{') {
5327 while (tok
!= '}') {
5328 decl_designator(type
, sec
, c
, NULL
, &f
, size_only
);
5330 if (!size_only
&& array_length
< index
) {
5331 init_putz(type
, sec
, c
+ array_length
,
5332 index
- array_length
);
5334 index
= index
+ type_size(&f
->type
, &align1
);
5335 if (index
> array_length
)
5336 array_length
= index
;
5338 /* gr: skip fields from same union - ugly. */
5340 ///printf("index: %2d %08x -- %2d %08x\n", f->c, f->type.t, f->next->c, f->next->type.t);
5341 /* test for same offset */
5342 if (f
->next
->c
!= f
->c
)
5344 /* if yes, test for bitfield shift */
5345 if ((f
->type
.t
& VT_BITFIELD
) && (f
->next
->type
.t
& VT_BITFIELD
)) {
5346 int bit_pos_1
= (f
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5347 int bit_pos_2
= (f
->next
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5348 //printf("bitfield %d %d\n", bit_pos_1, bit_pos_2);
5349 if (bit_pos_1
!= bit_pos_2
)
5356 if (no_oblock
&& f
== NULL
)
5362 /* put zeros at the end */
5363 if (!size_only
&& array_length
< n
) {
5364 init_putz(type
, sec
, c
+ array_length
,
5373 } else if (tok
== '{') {
5375 decl_initializer(type
, sec
, c
, first
, size_only
);
5377 } else if (size_only
) {
5378 /* just skip expression */
5379 parlevel
= parlevel1
= 0;
5380 while ((parlevel
> 0 || parlevel1
> 0 ||
5381 (tok
!= '}' && tok
!= ',')) && tok
!= -1) {
5384 else if (tok
== ')')
5386 else if (tok
== '{')
5388 else if (tok
== '}')
5393 /* currently, we always use constant expression for globals
5394 (may change for scripting case) */
5395 expr_type
= EXPR_CONST
;
5397 expr_type
= EXPR_ANY
;
5398 init_putv(type
, sec
, c
, 0, expr_type
);
5402 /* parse an initializer for type 't' if 'has_init' is non zero, and
5403 allocate space in local or global data space ('r' is either
5404 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
5405 variable 'v' with an associated name represented by 'asm_label' of
5406 scope 'scope' is declared before initializers are parsed. If 'v' is
5407 zero, then a reference to the new object is put in the value stack.
5408 If 'has_init' is 2, a special parsing is done to handle string
5410 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
,
5411 int has_init
, int v
, char *asm_label
,
5414 int size
, align
, addr
, data_offset
;
5416 ParseState saved_parse_state
= {0};
5417 TokenString init_str
;
5419 Sym
*flexible_array
;
5421 flexible_array
= NULL
;
5422 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
5423 Sym
*field
= type
->ref
->next
;
5426 field
= field
->next
;
5427 if (field
->type
.t
& VT_ARRAY
&& field
->type
.ref
->c
< 0)
5428 flexible_array
= field
;
5432 size
= type_size(type
, &align
);
5433 /* If unknown size, we must evaluate it before
5434 evaluating initializers because
5435 initializers can generate global data too
5436 (e.g. string pointers or ISOC99 compound
5437 literals). It also simplifies local
5438 initializers handling */
5439 tok_str_new(&init_str
);
5440 if (size
< 0 || (flexible_array
&& has_init
)) {
5442 tcc_error("unknown type size");
5443 /* get all init string */
5444 if (has_init
== 2) {
5445 /* only get strings */
5446 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5447 tok_str_add_tok(&init_str
);
5452 while (level
> 0 || (tok
!= ',' && tok
!= ';')) {
5454 tcc_error("unexpected end of file in initializer");
5455 tok_str_add_tok(&init_str
);
5458 else if (tok
== '}') {
5468 tok_str_add(&init_str
, -1);
5469 tok_str_add(&init_str
, 0);
5472 save_parse_state(&saved_parse_state
);
5474 macro_ptr
= init_str
.str
;
5476 decl_initializer(type
, NULL
, 0, 1, 1);
5477 /* prepare second initializer parsing */
5478 macro_ptr
= init_str
.str
;
5481 /* if still unknown size, error */
5482 size
= type_size(type
, &align
);
5484 tcc_error("unknown type size");
5487 size
+= flexible_array
->type
.ref
->c
* pointed_size(&flexible_array
->type
);
5488 /* take into account specified alignment if bigger */
5489 if (ad
->a
.aligned
) {
5490 if (ad
->a
.aligned
> align
)
5491 align
= ad
->a
.aligned
;
5492 } else if (ad
->a
.packed
) {
5495 if ((r
& VT_VALMASK
) == VT_LOCAL
) {
5497 #ifdef CONFIG_TCC_BCHECK
5498 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5502 loc
= (loc
- size
) & -align
;
5504 #ifdef CONFIG_TCC_BCHECK
5505 /* handles bounds */
5506 /* XXX: currently, since we do only one pass, we cannot track
5507 '&' operators, so we add only arrays */
5508 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5509 unsigned long *bounds_ptr
;
5510 /* add padding between regions */
5512 /* then add local bound info */
5513 bounds_ptr
= section_ptr_add(lbounds_section
, 2 * sizeof(unsigned long));
5514 bounds_ptr
[0] = addr
;
5515 bounds_ptr
[1] = size
;
5519 /* local variable */
5520 sym_push(v
, type
, r
, addr
);
5522 /* push local reference */
5523 vset(type
, r
, addr
);
5529 if (v
&& scope
== VT_CONST
) {
5530 /* see if the symbol was already defined */
5533 if (!is_compatible_types(&sym
->type
, type
))
5534 tcc_error("incompatible types for redefinition of '%s'",
5535 get_tok_str(v
, NULL
));
5536 if (sym
->type
.t
& VT_EXTERN
) {
5537 /* if the variable is extern, it was not allocated */
5538 sym
->type
.t
&= ~VT_EXTERN
;
5539 /* set array size if it was ommited in extern
5541 if ((sym
->type
.t
& VT_ARRAY
) &&
5542 sym
->type
.ref
->c
< 0 &&
5544 sym
->type
.ref
->c
= type
->ref
->c
;
5546 /* we accept several definitions of the same
5547 global variable. this is tricky, because we
5548 must play with the SHN_COMMON type of the symbol */
5549 /* XXX: should check if the variable was already
5550 initialized. It is incorrect to initialized it
5552 /* no init data, we won't add more to the symbol */
5559 /* allocate symbol in corresponding section */
5564 else if (tcc_state
->nocommon
)
5568 data_offset
= sec
->data_offset
;
5569 data_offset
= (data_offset
+ align
- 1) & -align
;
5571 /* very important to increment global pointer at this time
5572 because initializers themselves can create new initializers */
5573 data_offset
+= size
;
5574 #ifdef CONFIG_TCC_BCHECK
5575 /* add padding if bound check */
5576 if (tcc_state
->do_bounds_check
)
5579 sec
->data_offset
= data_offset
;
5580 /* allocate section space to put the data */
5581 if (sec
->sh_type
!= SHT_NOBITS
&&
5582 data_offset
> sec
->data_allocated
)
5583 section_realloc(sec
, data_offset
);
5584 /* align section if needed */
5585 if (align
> sec
->sh_addralign
)
5586 sec
->sh_addralign
= align
;
5588 addr
= 0; /* avoid warning */
5592 if (scope
!= VT_CONST
|| !sym
) {
5593 sym
= sym_push(v
, type
, r
| VT_SYM
, 0);
5594 sym
->asm_label
= asm_label
;
5596 /* update symbol definition */
5598 put_extern_sym(sym
, sec
, addr
, size
);
5601 /* put a common area */
5602 put_extern_sym(sym
, NULL
, align
, size
);
5603 /* XXX: find a nicer way */
5604 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
5605 esym
->st_shndx
= SHN_COMMON
;
5610 /* push global reference */
5611 sym
= get_sym_ref(type
, sec
, addr
, size
);
5613 vsetc(type
, VT_CONST
| VT_SYM
, &cval
);
5616 /* patch symbol weakness */
5617 if (type
->t
& VT_WEAK
)
5619 #ifdef CONFIG_TCC_BCHECK
5620 /* handles bounds now because the symbol must be defined
5621 before for the relocation */
5622 if (tcc_state
->do_bounds_check
) {
5623 unsigned long *bounds_ptr
;
5625 greloc(bounds_section
, sym
, bounds_section
->data_offset
, R_DATA_PTR
);
5626 /* then add global bound info */
5627 bounds_ptr
= section_ptr_add(bounds_section
, 2 * sizeof(long));
5628 bounds_ptr
[0] = 0; /* relocated */
5629 bounds_ptr
[1] = size
;
5633 if (has_init
|| (type
->t
& VT_VLA
)) {
5634 decl_initializer(type
, sec
, addr
, 1, 0);
5635 /* restore parse state if needed */
5637 tok_str_free(init_str
.str
);
5638 restore_parse_state(&saved_parse_state
);
5640 /* patch flexible array member size back to -1, */
5641 /* for possible subsequent similar declarations */
5643 flexible_array
->type
.ref
->c
= -1;
5648 static void put_func_debug(Sym
*sym
)
5653 /* XXX: we put here a dummy type */
5654 snprintf(buf
, sizeof(buf
), "%s:%c1",
5655 funcname
, sym
->type
.t
& VT_STATIC
? 'f' : 'F');
5656 put_stabs_r(buf
, N_FUN
, 0, file
->line_num
, 0,
5657 cur_text_section
, sym
->c
);
5658 /* //gr gdb wants a line at the function */
5659 put_stabn(N_SLINE
, 0, file
->line_num
, 0);
5664 /* parse an old style function declaration list */
5665 /* XXX: check multiple parameter */
5666 static void func_decl_list(Sym
*func_sym
)
5673 /* parse each declaration */
5674 while (tok
!= '{' && tok
!= ';' && tok
!= ',' && tok
!= TOK_EOF
&&
5675 tok
!= TOK_ASM1
&& tok
!= TOK_ASM2
&& tok
!= TOK_ASM3
) {
5676 if (!parse_btype(&btype
, &ad
))
5677 expect("declaration list");
5678 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
5679 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
5681 /* we accept no variable after */
5685 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
5686 /* find parameter in function parameter list */
5689 if ((s
->v
& ~SYM_FIELD
) == v
)
5693 tcc_error("declaration for parameter '%s' but no such parameter",
5694 get_tok_str(v
, NULL
));
5696 /* check that no storage specifier except 'register' was given */
5697 if (type
.t
& VT_STORAGE
)
5698 tcc_error("storage class specified for '%s'", get_tok_str(v
, NULL
));
5699 convert_parameter_type(&type
);
5700 /* we can add the type (NOTE: it could be local to the function) */
5702 /* accept other parameters */
5713 /* parse a function defined by symbol 'sym' and generate its code in
5714 'cur_text_section' */
5715 static void gen_function(Sym
*sym
)
5717 int saved_nocode_wanted
= nocode_wanted
;
5719 ind
= cur_text_section
->data_offset
;
5720 /* NOTE: we patch the symbol size later */
5721 put_extern_sym(sym
, cur_text_section
, ind
, 0);
5722 funcname
= get_tok_str(sym
->v
, NULL
);
5724 /* Initialize VLA state */
5725 vla_sp_loc
= &vla_sp_root_loc
;
5726 vla_flags
= VLA_NEED_NEW_FRAME
;
5727 /* put debug symbol */
5728 if (tcc_state
->do_debug
)
5729 put_func_debug(sym
);
5730 /* push a dummy symbol to enable local sym storage */
5731 sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
5732 gfunc_prolog(&sym
->type
);
5734 block(NULL
, NULL
, NULL
, NULL
, 0, 0);
5737 cur_text_section
->data_offset
= ind
;
5738 label_pop(&global_label_stack
, NULL
);
5739 /* reset local stack */
5740 scope_stack_bottom
= NULL
;
5741 sym_pop(&local_stack
, NULL
);
5742 /* end of function */
5743 /* patch symbol size */
5744 ((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
].st_size
=
5746 /* patch symbol weakness (this definition overrules any prototype) */
5747 if (sym
->type
.t
& VT_WEAK
)
5749 if (tcc_state
->do_debug
) {
5750 put_stabn(N_FUN
, 0, 0, ind
- func_ind
);
5752 /* It's better to crash than to generate wrong code */
5753 cur_text_section
= NULL
;
5754 funcname
= ""; /* for safety */
5755 func_vt
.t
= VT_VOID
; /* for safety */
5756 func_var
= 0; /* for safety */
5757 ind
= 0; /* for safety */
5758 nocode_wanted
= saved_nocode_wanted
;
5761 ST_FUNC
void gen_inline_functions(void)
5764 int *str
, inline_generated
, i
;
5765 struct InlineFunc
*fn
;
5767 /* iterate while inline function are referenced */
5769 inline_generated
= 0;
5770 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
5771 fn
= tcc_state
->inline_fns
[i
];
5773 if (sym
&& sym
->c
) {
5774 /* the function was used: generate its code and
5775 convert it to a normal function */
5776 str
= fn
->token_str
;
5779 pstrcpy(file
->filename
, sizeof file
->filename
, fn
->filename
);
5780 sym
->r
= VT_SYM
| VT_CONST
;
5781 sym
->type
.t
&= ~VT_INLINE
;
5785 cur_text_section
= text_section
;
5787 macro_ptr
= NULL
; /* fail safe */
5789 inline_generated
= 1;
5792 if (!inline_generated
)
5795 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
5796 fn
= tcc_state
->inline_fns
[i
];
5797 str
= fn
->token_str
;
5800 dynarray_reset(&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
);
5803 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
5804 static int decl0(int l
, int is_for_loop_init
)
5812 if (!parse_btype(&btype
, &ad
)) {
5813 if (is_for_loop_init
)
5815 /* skip redundant ';' */
5816 /* XXX: find more elegant solution */
5821 if (l
== VT_CONST
&&
5822 (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
5823 /* global asm block */
5827 /* special test for old K&R protos without explicit int
5828 type. Only accepted when defining global data */
5829 if (l
== VT_LOCAL
|| tok
< TOK_DEFINE
)
5833 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
5834 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
5836 /* we accept no variable after */
5840 while (1) { /* iterate thru each declaration */
5841 char *asm_label
; // associated asm label
5843 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
5847 type_to_str(buf
, sizeof(buf
), t
, get_tok_str(v
, NULL
));
5848 printf("type = '%s'\n", buf
);
5851 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
5852 if ((type
.t
& VT_STATIC
) && (l
== VT_LOCAL
)) {
5853 tcc_error("function without file scope cannot be static");
5855 /* if old style function prototype, we accept a
5858 if (sym
->c
== FUNC_OLD
)
5859 func_decl_list(sym
);
5863 if (gnu_ext
&& (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
5866 asm_label_instr(&astr
);
5867 asm_label
= tcc_strdup(astr
.data
);
5870 /* parse one last attribute list, after asm label */
5871 parse_attribute(&ad
);
5876 #ifdef TCC_TARGET_PE
5877 if (ad
.a
.func_import
)
5878 type
.t
|= VT_IMPORT
;
5879 if (ad
.a
.func_export
)
5880 type
.t
|= VT_EXPORT
;
5884 tcc_error("cannot use local functions");
5885 if ((type
.t
& VT_BTYPE
) != VT_FUNC
)
5886 expect("function definition");
5888 /* reject abstract declarators in function definition */
5890 while ((sym
= sym
->next
) != NULL
)
5891 if (!(sym
->v
& ~SYM_FIELD
))
5892 expect("identifier");
5894 /* XXX: cannot do better now: convert extern line to static inline */
5895 if ((type
.t
& (VT_EXTERN
| VT_INLINE
)) == (VT_EXTERN
| VT_INLINE
))
5896 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
5901 if ((sym
->type
.t
& VT_BTYPE
) != VT_FUNC
)
5904 ref
= sym
->type
.ref
;
5905 if (0 == ref
->a
.func_proto
)
5906 tcc_error("redefinition of '%s'", get_tok_str(v
, NULL
));
5908 /* use func_call from prototype if not defined */
5909 if (ref
->a
.func_call
!= FUNC_CDECL
5910 && type
.ref
->a
.func_call
== FUNC_CDECL
)
5911 type
.ref
->a
.func_call
= ref
->a
.func_call
;
5913 /* use export from prototype */
5914 if (ref
->a
.func_export
)
5915 type
.ref
->a
.func_export
= 1;
5917 /* use static from prototype */
5918 if (sym
->type
.t
& VT_STATIC
)
5919 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
5921 if (!is_compatible_types(&sym
->type
, &type
)) {
5923 tcc_error("incompatible types for redefinition of '%s'",
5924 get_tok_str(v
, NULL
));
5926 type
.ref
->a
.func_proto
= 0;
5927 /* if symbol is already defined, then put complete type */
5930 /* put function symbol */
5931 sym
= global_identifier_push(v
, type
.t
, 0);
5932 sym
->type
.ref
= type
.ref
;
5935 /* static inline functions are just recorded as a kind
5936 of macro. Their code will be emitted at the end of
5937 the compilation unit only if they are used */
5938 if ((type
.t
& (VT_INLINE
| VT_STATIC
)) ==
5939 (VT_INLINE
| VT_STATIC
)) {
5940 TokenString func_str
;
5942 struct InlineFunc
*fn
;
5943 const char *filename
;
5945 tok_str_new(&func_str
);
5951 tcc_error("unexpected end of file");
5952 tok_str_add_tok(&func_str
);
5957 } else if (t
== '}') {
5959 if (block_level
== 0)
5963 tok_str_add(&func_str
, -1);
5964 tok_str_add(&func_str
, 0);
5965 filename
= file
? file
->filename
: "";
5966 fn
= tcc_malloc(sizeof *fn
+ strlen(filename
));
5967 strcpy(fn
->filename
, filename
);
5969 fn
->token_str
= func_str
.str
;
5970 dynarray_add((void ***)&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
, fn
);
5973 /* compute text section */
5974 cur_text_section
= ad
.section
;
5975 if (!cur_text_section
)
5976 cur_text_section
= text_section
;
5977 sym
->r
= VT_SYM
| VT_CONST
;
5982 if (btype
.t
& VT_TYPEDEF
) {
5983 /* save typedefed type */
5984 /* XXX: test storage specifiers ? */
5985 sym
= sym_push(v
, &type
, 0, 0);
5987 sym
->type
.t
|= VT_TYPEDEF
;
5990 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
5991 /* external function definition */
5992 /* specific case for func_call attribute */
5993 ad
.a
.func_proto
= 1;
5995 } else if (!(type
.t
& VT_ARRAY
)) {
5996 /* not lvalue if array */
5997 r
|= lvalue_type(type
.t
);
5999 has_init
= (tok
== '=');
6000 if (has_init
&& (type
.t
& VT_VLA
))
6001 tcc_error("Variable length array cannot be initialized");
6002 if ((btype
.t
& VT_EXTERN
) || ((type
.t
& VT_BTYPE
) == VT_FUNC
) ||
6003 ((type
.t
& VT_ARRAY
) && (type
.t
& VT_STATIC
) &&
6004 !has_init
&& l
== VT_CONST
&& type
.ref
->c
< 0)) {
6005 /* external variable or function */
6006 /* NOTE: as GCC, uninitialized global static
6007 arrays of null size are considered as
6009 sym
= external_sym(v
, &type
, r
, asm_label
);
6011 if (type
.t
& VT_WEAK
)
6014 if (ad
.alias_target
) {
6019 alias_target
= sym_find(ad
.alias_target
);
6020 if (!alias_target
|| !alias_target
->c
)
6021 tcc_error("unsupported forward __alias__ attribute");
6022 esym
= &((Elf32_Sym
*)symtab_section
->data
)[alias_target
->c
];
6023 tsec
.sh_num
= esym
->st_shndx
;
6024 put_extern_sym2(sym
, &tsec
, esym
->st_value
, esym
->st_size
, 0);
6027 type
.t
|= (btype
.t
& VT_STATIC
); /* Retain "static". */
6028 if (type
.t
& VT_STATIC
)
6034 decl_initializer_alloc(&type
, &ad
, r
, has_init
, v
, asm_label
, l
);
6038 if (is_for_loop_init
)
6051 ST_FUNC
void decl(int l
)