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) */
70 ST_DATA
int last_line_num
, last_ind
, func_ind
; /* debug last line number and pc */
71 ST_DATA
char *funcname
;
73 ST_DATA CType char_pointer_type
, func_old_type
, int_type
, size_type
;
75 /* ------------------------------------------------------------------------- */
76 static void gen_cast(CType
*type
);
77 static inline CType
*pointed_type(CType
*type
);
78 static int is_compatible_types(CType
*type1
, CType
*type2
);
79 static int parse_btype(CType
*type
, AttributeDef
*ad
);
80 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
);
81 static void parse_expr_type(CType
*type
);
82 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
, int first
, int size_only
);
83 static void block(int *bsym
, int *csym
, int *case_sym
, int *def_sym
, int case_reg
, int is_expr
);
84 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
, int has_init
, int v
, char *asm_label
, int scope
);
85 static int decl0(int l
, int is_for_loop_init
);
86 static void expr_eq(void);
87 static void unary_type(CType
*type
);
88 static void vla_runtime_type_size(CType
*type
, int *a
);
89 static void vla_sp_save(void);
90 static int is_compatible_parameter_types(CType
*type1
, CType
*type2
);
91 static void expr_type(CType
*type
);
93 ST_INLN
int is_float(int t
)
97 return bt
== VT_LDOUBLE
|| bt
== VT_DOUBLE
|| bt
== VT_FLOAT
|| bt
== VT_QFLOAT
;
100 /* we use our own 'finite' function to avoid potential problems with
101 non standard math libs */
102 /* XXX: endianness dependent */
103 ST_FUNC
int ieee_finite(double d
)
106 return ((unsigned)((p
[1] | 0x800fffff) + 1)) >> 31;
109 ST_FUNC
void test_lvalue(void)
111 if (!(vtop
->r
& VT_LVAL
))
115 /* ------------------------------------------------------------------------- */
116 /* symbol allocator */
117 static Sym
*__sym_malloc(void)
119 Sym
*sym_pool
, *sym
, *last_sym
;
122 sym_pool
= tcc_malloc(SYM_POOL_NB
* sizeof(Sym
));
123 dynarray_add(&sym_pools
, &nb_sym_pools
, sym_pool
);
125 last_sym
= sym_free_first
;
127 for(i
= 0; i
< SYM_POOL_NB
; i
++) {
128 sym
->next
= last_sym
;
132 sym_free_first
= last_sym
;
136 static inline Sym
*sym_malloc(void)
139 sym
= sym_free_first
;
141 sym
= __sym_malloc();
142 sym_free_first
= sym
->next
;
146 ST_INLN
void sym_free(Sym
*sym
)
148 sym
->next
= sym_free_first
;
149 tcc_free(sym
->asm_label
);
150 sym_free_first
= sym
;
153 /* push, without hashing */
154 ST_FUNC Sym
*sym_push2(Sym
**ps
, int v
, int t
, long c
)
157 if (ps
== &local_stack
) {
158 for (s
= *ps
; s
&& s
!= scope_stack_bottom
; s
= s
->prev
)
159 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
&& s
->v
== v
)
160 tcc_error("incompatible types for redefinition of '%s'",
161 get_tok_str(v
, NULL
));
180 /* find a symbol and return its associated structure. 's' is the top
181 of the symbol stack */
182 ST_FUNC Sym
*sym_find2(Sym
*s
, int v
)
192 /* structure lookup */
193 ST_INLN Sym
*struct_find(int v
)
196 if ((unsigned)v
>= (unsigned)(tok_ident
- TOK_IDENT
))
198 return table_ident
[v
]->sym_struct
;
201 /* find an identifier */
202 ST_INLN Sym
*sym_find(int v
)
205 if ((unsigned)v
>= (unsigned)(tok_ident
- TOK_IDENT
))
207 return table_ident
[v
]->sym_identifier
;
210 /* push a given symbol on the symbol stack */
211 ST_FUNC Sym
*sym_push(int v
, CType
*type
, int r
, int c
)
220 s
= sym_push2(ps
, v
, type
->t
, c
);
221 s
->type
.ref
= type
->ref
;
223 /* don't record fields or anonymous symbols */
225 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
226 /* record symbol in token array */
227 ts
= table_ident
[(v
& ~SYM_STRUCT
) - TOK_IDENT
];
229 ps
= &ts
->sym_struct
;
231 ps
= &ts
->sym_identifier
;
238 /* push a global identifier */
239 ST_FUNC Sym
*global_identifier_push(int v
, int t
, int c
)
242 s
= sym_push2(&global_stack
, v
, t
, c
);
243 /* don't record anonymous symbol */
244 if (v
< SYM_FIRST_ANOM
) {
245 ps
= &table_ident
[v
- TOK_IDENT
]->sym_identifier
;
246 /* modify the top most local identifier, so that
247 sym_identifier will point to 's' when popped */
249 ps
= &(*ps
)->prev_tok
;
256 /* pop symbols until top reaches 'b' */
257 ST_FUNC
void sym_pop(Sym
**ptop
, Sym
*b
)
267 /* remove symbol in token array */
269 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
270 ts
= table_ident
[(v
& ~SYM_STRUCT
) - TOK_IDENT
];
272 ps
= &ts
->sym_struct
;
274 ps
= &ts
->sym_identifier
;
283 static void weaken_symbol(Sym
*sym
)
285 sym
->type
.t
|= VT_WEAK
;
290 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
291 esym_type
= ELFW(ST_TYPE
)(esym
->st_info
);
292 esym
->st_info
= ELFW(ST_INFO
)(STB_WEAK
, esym_type
);
296 /* ------------------------------------------------------------------------- */
298 ST_FUNC
void swap(int *p
, int *q
)
306 static void vsetc(CType
*type
, int r
, CValue
*vc
)
310 if (vtop
>= vstack
+ (VSTACK_SIZE
- 1))
311 tcc_error("memory full");
312 /* cannot let cpu flags if other instruction are generated. Also
313 avoid leaving VT_JMP anywhere except on the top of the stack
314 because it would complicate the code generator. */
315 if (vtop
>= vstack
) {
316 v
= vtop
->r
& VT_VALMASK
;
317 if (v
== VT_CMP
|| (v
& ~1) == VT_JMP
)
327 /* push constant of type "type" with useless value */
328 void vpush(CType
*type
)
331 vsetc(type
, VT_CONST
, &cval
);
334 /* push integer constant */
335 ST_FUNC
void vpushi(int v
)
339 vsetc(&int_type
, VT_CONST
, &cval
);
342 /* push a pointer sized constant */
343 static void vpushs(long long v
)
350 vsetc(&size_type
, VT_CONST
, &cval
);
353 /* push arbitrary 64bit constant */
354 void vpush64(int ty
, unsigned long long v
)
361 vsetc(&ctype
, VT_CONST
, &cval
);
364 /* push long long constant */
365 static inline void vpushll(long long v
)
367 vpush64(VT_LLONG
, v
);
370 /* Return a static symbol pointing to a section */
371 ST_FUNC Sym
*get_sym_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
377 sym
= global_identifier_push(v
, type
->t
| VT_STATIC
, 0);
378 sym
->type
.ref
= type
->ref
;
379 sym
->r
= VT_CONST
| VT_SYM
;
380 put_extern_sym(sym
, sec
, offset
, size
);
384 /* push a reference to a section offset by adding a dummy symbol */
385 static void vpush_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
390 vsetc(type
, VT_CONST
| VT_SYM
, &cval
);
391 vtop
->sym
= get_sym_ref(type
, sec
, offset
, size
);
394 /* define a new external reference to a symbol 'v' of type 'u' */
395 ST_FUNC Sym
*external_global_sym(int v
, CType
*type
, int r
)
401 /* push forward reference */
402 s
= global_identifier_push(v
, type
->t
| VT_EXTERN
, 0);
403 s
->type
.ref
= type
->ref
;
404 s
->r
= r
| VT_CONST
| VT_SYM
;
409 /* define a new external reference to a symbol 'v' with alternate asm
410 name 'asm_label' of type 'u'. 'asm_label' is equal to NULL if there
411 is no alternate name (most cases) */
412 static Sym
*external_sym(int v
, CType
*type
, int r
, char *asm_label
)
418 /* push forward reference */
419 s
= sym_push(v
, type
, r
| VT_CONST
| VT_SYM
, 0);
420 s
->asm_label
= asm_label
;
421 s
->type
.t
|= VT_EXTERN
;
422 } else if (s
->type
.ref
== func_old_type
.ref
) {
423 s
->type
.ref
= type
->ref
;
424 s
->r
= r
| VT_CONST
| VT_SYM
;
425 s
->type
.t
|= VT_EXTERN
;
426 } else if (!is_compatible_types(&s
->type
, type
)) {
427 tcc_error("incompatible types for redefinition of '%s'",
428 get_tok_str(v
, NULL
));
433 /* push a reference to global symbol v */
434 ST_FUNC
void vpush_global_sym(CType
*type
, int v
)
439 sym
= external_global_sym(v
, type
, 0);
441 vsetc(type
, VT_CONST
| VT_SYM
, &cval
);
445 ST_FUNC
void vset(CType
*type
, int r
, int v
)
450 vsetc(type
, r
, &cval
);
453 static void vseti(int r
, int v
)
461 ST_FUNC
void vswap(void)
464 /* cannot let cpu flags if other instruction are generated. Also
465 avoid leaving VT_JMP anywhere except on the top of the stack
466 because it would complicate the code generator. */
467 if (vtop
>= vstack
) {
468 int v
= vtop
->r
& VT_VALMASK
;
469 if (v
== VT_CMP
|| (v
& ~1) == VT_JMP
)
476 /* XXX: +2% overall speed possible with optimized memswap
478 * memswap(&vtop[0], &vtop[1], sizeof *vtop);
482 ST_FUNC
void vpushv(SValue
*v
)
484 if (vtop
>= vstack
+ (VSTACK_SIZE
- 1))
485 tcc_error("memory full");
490 static void vdup(void)
495 /* save r to the memory stack, and mark it as being free */
496 ST_FUNC
void save_reg(int r
)
498 int l
, saved
, size
, align
;
502 /* modify all stack values */
505 for(p
=vstack
;p
<=vtop
;p
++) {
506 if ((p
->r
& VT_VALMASK
) == r
||
507 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& (p
->r2
& VT_VALMASK
) == r
)) {
508 /* must save value on stack if not already done */
510 /* NOTE: must reload 'r' because r might be equal to r2 */
511 r
= p
->r
& VT_VALMASK
;
512 /* store register in the stack */
514 if ((p
->r
& VT_LVAL
) ||
515 (!is_float(type
->t
) && (type
->t
& VT_BTYPE
) != VT_LLONG
))
516 #ifdef TCC_TARGET_X86_64
517 type
= &char_pointer_type
;
521 size
= type_size(type
, &align
);
522 loc
= (loc
- size
) & -align
;
524 sv
.r
= VT_LOCAL
| VT_LVAL
;
527 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
528 /* x86 specific: need to pop fp register ST0 if saved */
530 o(0xd8dd); /* fstp %st(0) */
533 #ifndef TCC_TARGET_X86_64
534 /* special long long case */
535 if ((type
->t
& VT_BTYPE
) == VT_LLONG
) {
543 /* mark that stack entry as being saved on the stack */
544 if (p
->r
& VT_LVAL
) {
545 /* also clear the bounded flag because the
546 relocation address of the function was stored in
548 p
->r
= (p
->r
& ~(VT_VALMASK
| VT_BOUNDED
)) | VT_LLOCAL
;
550 p
->r
= lvalue_type(p
->type
.t
) | VT_LOCAL
;
558 #ifdef TCC_TARGET_ARM
559 /* find a register of class 'rc2' with at most one reference on stack.
560 * If none, call get_reg(rc) */
561 ST_FUNC
int get_reg_ex(int rc
, int rc2
)
566 for(r
=0;r
<NB_REGS
;r
++) {
567 if (reg_classes
[r
] & rc2
) {
570 for(p
= vstack
; p
<= vtop
; p
++) {
571 if ((p
->r
& VT_VALMASK
) == r
||
572 (p
->r2
& VT_VALMASK
) == r
)
583 /* find a free register of class 'rc'. If none, save one register */
584 ST_FUNC
int get_reg(int rc
)
589 /* find a free register */
590 for(r
=0;r
<NB_REGS
;r
++) {
591 if (reg_classes
[r
] & rc
) {
592 for(p
=vstack
;p
<=vtop
;p
++) {
593 if ((p
->r
& VT_VALMASK
) == r
||
594 (p
->r2
& VT_VALMASK
) == r
)
602 /* no register left : free the first one on the stack (VERY
603 IMPORTANT to start from the bottom to ensure that we don't
604 spill registers used in gen_opi()) */
605 for(p
=vstack
;p
<=vtop
;p
++) {
606 /* look at second register (if long long) */
607 r
= p
->r2
& VT_VALMASK
;
608 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
))
610 r
= p
->r
& VT_VALMASK
;
611 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
)) {
617 /* Should never comes here */
621 /* save registers up to (vtop - n) stack entry */
622 ST_FUNC
void save_regs(int n
)
627 for(p
= vstack
;p
<= p1
; p
++) {
628 r
= p
->r
& VT_VALMASK
;
635 /* move register 's' (of type 't') to 'r', and flush previous value of r to memory
637 static void move_reg(int r
, int s
, int t
)
651 /* get address of vtop (vtop MUST BE an lvalue) */
652 static void gaddrof(void)
654 if (vtop
->r
& VT_REF
)
657 /* tricky: if saved lvalue, then we can go back to lvalue */
658 if ((vtop
->r
& VT_VALMASK
) == VT_LLOCAL
)
659 vtop
->r
= (vtop
->r
& ~(VT_VALMASK
| VT_LVAL_TYPE
)) | VT_LOCAL
| VT_LVAL
;
664 #ifdef CONFIG_TCC_BCHECK
665 /* generate lvalue bound code */
666 static void gbound(void)
671 vtop
->r
&= ~VT_MUSTBOUND
;
672 /* if lvalue, then use checking code before dereferencing */
673 if (vtop
->r
& VT_LVAL
) {
674 /* if not VT_BOUNDED value, then make one */
675 if (!(vtop
->r
& VT_BOUNDED
)) {
676 lval_type
= vtop
->r
& (VT_LVAL_TYPE
| VT_LVAL
);
677 /* must save type because we must set it to int to get pointer */
679 vtop
->type
.t
= VT_INT
;
682 gen_bounded_ptr_add();
683 vtop
->r
|= lval_type
;
686 /* then check for dereferencing */
687 gen_bounded_ptr_deref();
692 /* store vtop a register belonging to class 'rc'. lvalues are
693 converted to values. Cannot be used if cannot be converted to
694 register value (such as structures). */
695 ST_FUNC
int gv(int rc
)
697 int r
, bit_pos
, bit_size
, size
, align
, i
;
700 /* NOTE: get_reg can modify vstack[] */
701 if (vtop
->type
.t
& VT_BITFIELD
) {
704 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
705 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
706 /* remove bit field info to avoid loops */
707 vtop
->type
.t
&= ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
));
708 /* cast to int to propagate signedness in following ops */
709 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
714 if((vtop
->type
.t
& VT_UNSIGNED
) ||
715 (vtop
->type
.t
& VT_BTYPE
) == VT_BOOL
)
716 type
.t
|= VT_UNSIGNED
;
718 /* generate shifts */
719 vpushi(bits
- (bit_pos
+ bit_size
));
721 vpushi(bits
- bit_size
);
722 /* NOTE: transformed to SHR if unsigned */
726 if (is_float(vtop
->type
.t
) &&
727 (vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
730 unsigned long offset
;
731 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
735 /* XXX: unify with initializers handling ? */
736 /* CPUs usually cannot use float constants, so we store them
737 generically in data segment */
738 size
= type_size(&vtop
->type
, &align
);
739 offset
= (data_section
->data_offset
+ align
- 1) & -align
;
740 data_section
->data_offset
= offset
;
741 /* XXX: not portable yet */
742 #if defined(__i386__) || defined(__x86_64__)
743 /* Zero pad x87 tenbyte long doubles */
744 if (size
== LDOUBLE_SIZE
) {
745 vtop
->c
.tab
[2] &= 0xffff;
746 #if LDOUBLE_SIZE == 16
751 ptr
= section_ptr_add(data_section
, size
);
753 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
757 ptr
[i
] = vtop
->c
.tab
[size
-1-i
];
761 ptr
[i
] = vtop
->c
.tab
[i
];
762 sym
= get_sym_ref(&vtop
->type
, data_section
, offset
, size
<< 2);
763 vtop
->r
|= VT_LVAL
| VT_SYM
;
767 #ifdef CONFIG_TCC_BCHECK
768 if (vtop
->r
& VT_MUSTBOUND
)
772 r
= vtop
->r
& VT_VALMASK
;
773 rc2
= (rc
& RC_FLOAT
) ? RC_FLOAT
: RC_INT
;
776 #ifdef TCC_TARGET_X86_64
777 else if (rc
== RC_FRET
)
781 /* need to reload if:
783 - lvalue (need to dereference pointer)
784 - already a register, but not in the right class */
786 || (vtop
->r
& VT_LVAL
)
787 || !(reg_classes
[r
] & rc
)
788 #ifdef TCC_TARGET_X86_64
789 || ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
&& !(reg_classes
[vtop
->r2
] & rc2
))
790 || ((vtop
->type
.t
& VT_BTYPE
) == VT_QFLOAT
&& !(reg_classes
[vtop
->r2
] & rc2
))
792 || ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
&& !(reg_classes
[vtop
->r2
] & rc2
))
797 #ifdef TCC_TARGET_X86_64
798 if (((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) || ((vtop
->type
.t
& VT_BTYPE
) == VT_QFLOAT
)) {
799 int addr_type
= VT_LLONG
, load_size
= 8, load_type
= ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) ? VT_LLONG
: VT_DOUBLE
;
801 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
802 int addr_type
= VT_INT
, load_size
= 4, load_type
= VT_INT
;
804 int r2
, original_type
;
805 unsigned long long ll
;
806 original_type
= vtop
->type
.t
;
807 /* two register type load : expand to two words
809 #ifndef TCC_TARGET_X86_64
810 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
813 vtop
->c
.ui
= ll
; /* first word */
815 vtop
->r
= r
; /* save register value */
816 vpushi(ll
>> 32); /* second word */
819 if (r
>= VT_CONST
|| /* XXX: test to VT_CONST incorrect ? */
820 (vtop
->r
& VT_LVAL
)) {
821 /* We do not want to modifier the long long
822 pointer here, so the safest (and less
823 efficient) is to save all the other registers
824 in the stack. XXX: totally inefficient. */
826 /* load from memory */
827 vtop
->type
.t
= load_type
;
830 vtop
[-1].r
= r
; /* save register value */
831 /* increment pointer to get second word */
832 vtop
->type
.t
= addr_type
;
837 vtop
->type
.t
= load_type
;
842 vtop
[-1].r
= r
; /* save register value */
843 vtop
->r
= vtop
[-1].r2
;
845 /* Allocate second register. Here we rely on the fact that
846 get_reg() tries first to free r2 of an SValue. */
850 /* write second register */
852 vtop
->type
.t
= original_type
;
853 } else if ((vtop
->r
& VT_LVAL
) && !is_float(vtop
->type
.t
)) {
855 /* lvalue of scalar type : need to use lvalue type
856 because of possible cast */
859 /* compute memory access type */
860 if (vtop
->r
& VT_REF
)
861 #ifdef TCC_TARGET_X86_64
866 else if (vtop
->r
& VT_LVAL_BYTE
)
868 else if (vtop
->r
& VT_LVAL_SHORT
)
870 if (vtop
->r
& VT_LVAL_UNSIGNED
)
874 /* restore wanted type */
877 /* one register type load */
882 #ifdef TCC_TARGET_C67
883 /* uses register pairs for doubles */
884 if ((vtop
->type
.t
& VT_BTYPE
) == VT_DOUBLE
)
891 /* generate vtop[-1] and vtop[0] in resp. classes rc1 and rc2 */
892 ST_FUNC
void gv2(int rc1
, int rc2
)
896 /* generate more generic register first. But VT_JMP or VT_CMP
897 values must be generated first in all cases to avoid possible
899 v
= vtop
[0].r
& VT_VALMASK
;
900 if (v
!= VT_CMP
&& (v
& ~1) != VT_JMP
&& rc1
<= rc2
) {
905 /* test if reload is needed for first register */
906 if ((vtop
[-1].r
& VT_VALMASK
) >= VT_CONST
) {
916 /* test if reload is needed for first register */
917 if ((vtop
[0].r
& VT_VALMASK
) >= VT_CONST
) {
923 /* wrapper around RC_FRET to return a register by type */
924 static int rc_fret(int t
)
926 #ifdef TCC_TARGET_X86_64
927 if (t
== VT_LDOUBLE
) {
934 /* wrapper around REG_FRET to return a register by type */
935 static int reg_fret(int t
)
937 #ifdef TCC_TARGET_X86_64
938 if (t
== VT_LDOUBLE
) {
945 /* expand long long on stack in two int registers */
946 static void lexpand(void)
950 u
= vtop
->type
.t
& VT_UNSIGNED
;
953 vtop
[0].r
= vtop
[-1].r2
;
954 vtop
[0].r2
= VT_CONST
;
955 vtop
[-1].r2
= VT_CONST
;
956 vtop
[0].type
.t
= VT_INT
| u
;
957 vtop
[-1].type
.t
= VT_INT
| u
;
960 #ifdef TCC_TARGET_ARM
961 /* expand long long on stack */
962 ST_FUNC
void lexpand_nr(void)
966 u
= vtop
->type
.t
& VT_UNSIGNED
;
969 vtop
->type
.t
= VT_INT
| u
;
970 v
=vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
);
972 vtop
[-1].c
.ui
= vtop
->c
.ull
;
973 vtop
->c
.ui
= vtop
->c
.ull
>> 32;
975 } else if (v
== (VT_LVAL
|VT_CONST
) || v
== (VT_LVAL
|VT_LOCAL
)) {
977 vtop
->r
= vtop
[-1].r
;
978 } else if (v
> VT_CONST
) {
982 vtop
->r
= vtop
[-1].r2
;
983 vtop
[-1].r2
= VT_CONST
;
984 vtop
[-1].type
.t
= VT_INT
| u
;
988 /* build a long long from two ints */
989 static void lbuild(int t
)
992 vtop
[-1].r2
= vtop
[0].r
;
997 /* rotate n first stack elements to the bottom
998 I1 ... In -> I2 ... In I1 [top is right]
1000 ST_FUNC
void vrotb(int n
)
1006 for(i
=-n
+1;i
!=0;i
++)
1007 vtop
[i
] = vtop
[i
+1];
1011 /* rotate the n elements before entry e towards the top
1012 I1 ... In ... -> In I1 ... I(n-1) ... [top is right]
1014 ST_FUNC
void vrote(SValue
*e
, int n
)
1020 for(i
= 0;i
< n
- 1; i
++)
1025 /* rotate n first stack elements to the top
1026 I1 ... In -> In I1 ... I(n-1) [top is right]
1028 ST_FUNC
void vrott(int n
)
1033 /* pop stack value */
1034 ST_FUNC
void vpop(void)
1037 v
= vtop
->r
& VT_VALMASK
;
1038 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
1039 /* for x86, we need to pop the FP stack */
1040 if (v
== TREG_ST0
&& !nocode_wanted
) {
1041 o(0xd8dd); /* fstp %st(0) */
1044 if (v
== VT_JMP
|| v
== VT_JMPI
) {
1045 /* need to put correct jump if && or || without test */
1051 /* convert stack entry to register and duplicate its value in another
1053 static void gv_dup(void)
1059 if ((t
& VT_BTYPE
) == VT_LLONG
) {
1066 /* stack: H L L1 H1 */
1074 /* duplicate value */
1079 #ifdef TCC_TARGET_X86_64
1080 if ((t
& VT_BTYPE
) == VT_LDOUBLE
) {
1090 load(r1
, &sv
); /* move r to r1 */
1092 /* duplicates value */
1098 #ifndef TCC_TARGET_X86_64
1099 /* generate CPU independent (unsigned) long long operations */
1100 static void gen_opl(int op
)
1102 int t
, a
, b
, op1
, c
, i
;
1104 unsigned short reg_iret
= REG_IRET
;
1105 unsigned short reg_lret
= REG_LRET
;
1111 func
= TOK___divdi3
;
1114 func
= TOK___udivdi3
;
1117 func
= TOK___moddi3
;
1120 func
= TOK___umoddi3
;
1127 /* call generic long long function */
1128 vpush_global_sym(&func_old_type
, func
);
1133 vtop
->r2
= reg_lret
;
1146 /* stack: L1 H1 L2 H2 */
1151 vtop
[-2] = vtop
[-3];
1154 /* stack: H1 H2 L1 L2 */
1160 /* stack: H1 H2 L1 L2 ML MH */
1163 /* stack: ML MH H1 H2 L1 L2 */
1167 /* stack: ML MH H1 L2 H2 L1 */
1172 /* stack: ML MH M1 M2 */
1175 } else if (op
== '+' || op
== '-') {
1176 /* XXX: add non carry method too (for MIPS or alpha) */
1182 /* stack: H1 H2 (L1 op L2) */
1185 gen_op(op1
+ 1); /* TOK_xxxC2 */
1188 /* stack: H1 H2 (L1 op L2) */
1191 /* stack: (L1 op L2) H1 H2 */
1193 /* stack: (L1 op L2) (H1 op H2) */
1201 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
1202 t
= vtop
[-1].type
.t
;
1206 /* stack: L H shift */
1208 /* constant: simpler */
1209 /* NOTE: all comments are for SHL. the other cases are
1210 done by swaping words */
1221 if (op
!= TOK_SAR
) {
1254 /* XXX: should provide a faster fallback on x86 ? */
1257 func
= TOK___ashrdi3
;
1260 func
= TOK___lshrdi3
;
1263 func
= TOK___ashldi3
;
1269 /* compare operations */
1275 /* stack: L1 H1 L2 H2 */
1277 vtop
[-1] = vtop
[-2];
1279 /* stack: L1 L2 H1 H2 */
1282 /* when values are equal, we need to compare low words. since
1283 the jump is inverted, we invert the test too. */
1286 else if (op1
== TOK_GT
)
1288 else if (op1
== TOK_ULT
)
1290 else if (op1
== TOK_UGT
)
1295 if (op1
!= TOK_NE
) {
1299 /* generate non equal test */
1300 /* XXX: NOT PORTABLE yet */
1304 #if defined(TCC_TARGET_I386)
1305 b
= psym(0x850f, 0);
1306 #elif defined(TCC_TARGET_ARM)
1308 o(0x1A000000 | encbranch(ind
, 0, 1));
1309 #elif defined(TCC_TARGET_C67)
1310 tcc_error("not implemented");
1312 #error not supported
1316 /* compare low. Always unsigned */
1320 else if (op1
== TOK_LE
)
1322 else if (op1
== TOK_GT
)
1324 else if (op1
== TOK_GE
)
1335 /* handle integer constant optimizations and various machine
1337 static void gen_opic(int op
)
1339 int c1
, c2
, t1
, t2
, n
;
1342 typedef unsigned long long U
;
1346 t1
= v1
->type
.t
& VT_BTYPE
;
1347 t2
= v2
->type
.t
& VT_BTYPE
;
1351 else if (v1
->type
.t
& VT_UNSIGNED
)
1358 else if (v2
->type
.t
& VT_UNSIGNED
)
1363 /* currently, we cannot do computations with forward symbols */
1364 c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1365 c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1368 case '+': l1
+= l2
; break;
1369 case '-': l1
-= l2
; break;
1370 case '&': l1
&= l2
; break;
1371 case '^': l1
^= l2
; break;
1372 case '|': l1
|= l2
; break;
1373 case '*': l1
*= l2
; break;
1380 /* if division by zero, generate explicit division */
1383 tcc_error("division by zero in constant");
1387 default: l1
/= l2
; break;
1388 case '%': l1
%= l2
; break;
1389 case TOK_UDIV
: l1
= (U
)l1
/ l2
; break;
1390 case TOK_UMOD
: l1
= (U
)l1
% l2
; break;
1393 case TOK_SHL
: l1
<<= l2
; break;
1394 case TOK_SHR
: l1
= (U
)l1
>> l2
; break;
1395 case TOK_SAR
: l1
>>= l2
; break;
1397 case TOK_ULT
: l1
= (U
)l1
< (U
)l2
; break;
1398 case TOK_UGE
: l1
= (U
)l1
>= (U
)l2
; break;
1399 case TOK_EQ
: l1
= l1
== l2
; break;
1400 case TOK_NE
: l1
= l1
!= l2
; break;
1401 case TOK_ULE
: l1
= (U
)l1
<= (U
)l2
; break;
1402 case TOK_UGT
: l1
= (U
)l1
> (U
)l2
; break;
1403 case TOK_LT
: l1
= l1
< l2
; break;
1404 case TOK_GE
: l1
= l1
>= l2
; break;
1405 case TOK_LE
: l1
= l1
<= l2
; break;
1406 case TOK_GT
: l1
= l1
> l2
; break;
1408 case TOK_LAND
: l1
= l1
&& l2
; break;
1409 case TOK_LOR
: l1
= l1
|| l2
; break;
1416 /* if commutative ops, put c2 as constant */
1417 if (c1
&& (op
== '+' || op
== '&' || op
== '^' ||
1418 op
== '|' || op
== '*')) {
1420 c2
= c1
; //c = c1, c1 = c2, c2 = c;
1421 l2
= l1
; //l = l1, l1 = l2, l2 = l;
1423 /* Filter out NOP operations like x*1, x-0, x&-1... */
1424 if (c2
&& (((op
== '*' || op
== '/' || op
== TOK_UDIV
||
1427 ((op
== '+' || op
== '-' || op
== '|' || op
== '^' ||
1428 op
== TOK_SHL
|| op
== TOK_SHR
|| op
== TOK_SAR
) &&
1434 } else if (c2
&& (op
== '*' || op
== TOK_PDIV
|| op
== TOK_UDIV
)) {
1435 /* try to use shifts instead of muls or divs */
1436 if (l2
> 0 && (l2
& (l2
- 1)) == 0) {
1445 else if (op
== TOK_PDIV
)
1451 } else if (c2
&& (op
== '+' || op
== '-') &&
1452 (((vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
))
1453 || (vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
)) == VT_LOCAL
)) {
1454 /* symbol + constant case */
1461 if (!nocode_wanted
) {
1462 /* call low level op generator */
1463 if (t1
== VT_LLONG
|| t2
== VT_LLONG
)
1474 /* generate a floating point operation with constant propagation */
1475 static void gen_opif(int op
)
1483 /* currently, we cannot do computations with forward symbols */
1484 c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1485 c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1487 if (v1
->type
.t
== VT_FLOAT
) {
1490 } else if (v1
->type
.t
== VT_DOUBLE
) {
1498 /* NOTE: we only do constant propagation if finite number (not
1499 NaN or infinity) (ANSI spec) */
1500 if (!ieee_finite(f1
) || !ieee_finite(f2
))
1504 case '+': f1
+= f2
; break;
1505 case '-': f1
-= f2
; break;
1506 case '*': f1
*= f2
; break;
1510 tcc_error("division by zero in constant");
1515 /* XXX: also handles tests ? */
1519 /* XXX: overflow test ? */
1520 if (v1
->type
.t
== VT_FLOAT
) {
1522 } else if (v1
->type
.t
== VT_DOUBLE
) {
1530 if (!nocode_wanted
) {
1538 static int pointed_size(CType
*type
)
1541 return type_size(pointed_type(type
), &align
);
1544 static void vla_runtime_pointed_size(CType
*type
)
1547 vla_runtime_type_size(pointed_type(type
), &align
);
1550 static inline int is_null_pointer(SValue
*p
)
1552 if ((p
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
1554 return ((p
->type
.t
& VT_BTYPE
) == VT_INT
&& p
->c
.i
== 0) ||
1555 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& p
->c
.ll
== 0) ||
1556 ((p
->type
.t
& VT_BTYPE
) == VT_PTR
&& p
->c
.ptr
== 0);
1559 static inline int is_integer_btype(int bt
)
1561 return (bt
== VT_BYTE
|| bt
== VT_SHORT
||
1562 bt
== VT_INT
|| bt
== VT_LLONG
);
1565 /* check types for comparison or substraction of pointers */
1566 static void check_comparison_pointer_types(SValue
*p1
, SValue
*p2
, int op
)
1568 CType
*type1
, *type2
, tmp_type1
, tmp_type2
;
1571 /* null pointers are accepted for all comparisons as gcc */
1572 if (is_null_pointer(p1
) || is_null_pointer(p2
))
1576 bt1
= type1
->t
& VT_BTYPE
;
1577 bt2
= type2
->t
& VT_BTYPE
;
1578 /* accept comparison between pointer and integer with a warning */
1579 if ((is_integer_btype(bt1
) || is_integer_btype(bt2
)) && op
!= '-') {
1580 if (op
!= TOK_LOR
&& op
!= TOK_LAND
)
1581 tcc_warning("comparison between pointer and integer");
1585 /* both must be pointers or implicit function pointers */
1586 if (bt1
== VT_PTR
) {
1587 type1
= pointed_type(type1
);
1588 } else if (bt1
!= VT_FUNC
)
1589 goto invalid_operands
;
1591 if (bt2
== VT_PTR
) {
1592 type2
= pointed_type(type2
);
1593 } else if (bt2
!= VT_FUNC
) {
1595 tcc_error("invalid operands to binary %s", get_tok_str(op
, NULL
));
1597 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
1598 (type2
->t
& VT_BTYPE
) == VT_VOID
)
1602 tmp_type1
.t
&= ~(VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1603 tmp_type2
.t
&= ~(VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1604 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
1605 /* gcc-like error if '-' is used */
1607 goto invalid_operands
;
1609 tcc_warning("comparison of distinct pointer types lacks a cast");
1613 /* generic gen_op: handles types problems */
1614 ST_FUNC
void gen_op(int op
)
1616 int u
, t1
, t2
, bt1
, bt2
, t
;
1619 t1
= vtop
[-1].type
.t
;
1620 t2
= vtop
[0].type
.t
;
1621 bt1
= t1
& VT_BTYPE
;
1622 bt2
= t2
& VT_BTYPE
;
1624 if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
1625 /* at least one operand is a pointer */
1626 /* relationnal op: must be both pointers */
1627 if (op
>= TOK_ULT
&& op
<= TOK_LOR
) {
1628 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1629 /* pointers are handled are unsigned */
1630 #ifdef TCC_TARGET_X86_64
1631 t
= VT_LLONG
| VT_UNSIGNED
;
1633 t
= VT_INT
| VT_UNSIGNED
;
1637 /* if both pointers, then it must be the '-' op */
1638 if (bt1
== VT_PTR
&& bt2
== VT_PTR
) {
1640 tcc_error("cannot use pointers here");
1641 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1642 /* XXX: check that types are compatible */
1643 if (vtop
[-1].type
.t
& VT_VLA
) {
1644 vla_runtime_pointed_size(&vtop
[-1].type
);
1646 vpushi(pointed_size(&vtop
[-1].type
));
1650 /* set to integer type */
1651 #ifdef TCC_TARGET_X86_64
1652 vtop
->type
.t
= VT_LLONG
;
1654 vtop
->type
.t
= VT_INT
;
1659 /* exactly one pointer : must be '+' or '-'. */
1660 if (op
!= '-' && op
!= '+')
1661 tcc_error("cannot use pointers here");
1662 /* Put pointer as first operand */
1663 if (bt2
== VT_PTR
) {
1667 type1
= vtop
[-1].type
;
1668 type1
.t
&= ~VT_ARRAY
;
1669 if (vtop
[-1].type
.t
& VT_VLA
)
1670 vla_runtime_pointed_size(&vtop
[-1].type
);
1672 u
= pointed_size(&vtop
[-1].type
);
1674 tcc_error("unknown array element size");
1675 #ifdef TCC_TARGET_X86_64
1678 /* XXX: cast to int ? (long long case) */
1683 #ifdef CONFIG_TCC_BCHECK
1684 /* if evaluating constant expression, no code should be
1685 generated, so no bound check */
1686 if (tcc_state
->do_bounds_check
&& !const_wanted
) {
1687 /* if bounded pointers, we generate a special code to
1694 gen_bounded_ptr_add();
1700 /* put again type if gen_opic() swaped operands */
1703 } else if (is_float(bt1
) || is_float(bt2
)) {
1704 /* compute bigger type and do implicit casts */
1705 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
1707 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
1712 /* floats can only be used for a few operations */
1713 if (op
!= '+' && op
!= '-' && op
!= '*' && op
!= '/' &&
1714 (op
< TOK_ULT
|| op
> TOK_GT
))
1715 tcc_error("invalid operands for binary operation");
1717 } else if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
) {
1718 t
= bt1
== VT_LLONG
? VT_LLONG
: VT_INT
;
1719 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (t
| VT_UNSIGNED
))
1722 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
1723 /* cast to biggest op */
1725 /* convert to unsigned if it does not fit in a long long */
1726 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
1727 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
1730 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
1731 tcc_error("comparison of struct");
1733 /* integer operations */
1735 /* convert to unsigned if it does not fit in an integer */
1736 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
1737 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
1740 /* XXX: currently, some unsigned operations are explicit, so
1741 we modify them here */
1742 if (t
& VT_UNSIGNED
) {
1749 else if (op
== TOK_LT
)
1751 else if (op
== TOK_GT
)
1753 else if (op
== TOK_LE
)
1755 else if (op
== TOK_GE
)
1762 /* special case for shifts and long long: we keep the shift as
1764 if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
)
1771 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
1772 /* relationnal op: the result is an int */
1773 vtop
->type
.t
= VT_INT
;
1780 #ifndef TCC_TARGET_ARM
1781 /* generic itof for unsigned long long case */
1782 static void gen_cvt_itof1(int t
)
1784 if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
1785 (VT_LLONG
| VT_UNSIGNED
)) {
1788 vpush_global_sym(&func_old_type
, TOK___floatundisf
);
1789 #if LDOUBLE_SIZE != 8
1790 else if (t
== VT_LDOUBLE
)
1791 vpush_global_sym(&func_old_type
, TOK___floatundixf
);
1794 vpush_global_sym(&func_old_type
, TOK___floatundidf
);
1798 vtop
->r
= reg_fret(t
);
1805 /* generic ftoi for unsigned long long case */
1806 static void gen_cvt_ftoi1(int t
)
1810 if (t
== (VT_LLONG
| VT_UNSIGNED
)) {
1811 /* not handled natively */
1812 st
= vtop
->type
.t
& VT_BTYPE
;
1814 vpush_global_sym(&func_old_type
, TOK___fixunssfdi
);
1815 #if LDOUBLE_SIZE != 8
1816 else if (st
== VT_LDOUBLE
)
1817 vpush_global_sym(&func_old_type
, TOK___fixunsxfdi
);
1820 vpush_global_sym(&func_old_type
, TOK___fixunsdfdi
);
1825 vtop
->r2
= REG_LRET
;
1831 /* force char or short cast */
1832 static void force_charshort_cast(int t
)
1836 /* XXX: add optimization if lvalue : just change type and offset */
1841 if (t
& VT_UNSIGNED
) {
1842 vpushi((1 << bits
) - 1);
1848 /* result must be signed or the SAR is converted to an SHL
1849 This was not the case when "t" was a signed short
1850 and the last value on the stack was an unsigned int */
1851 vtop
->type
.t
&= ~VT_UNSIGNED
;
1857 /* cast 'vtop' to 'type'. Casting to bitfields is forbidden. */
1858 static void gen_cast(CType
*type
)
1860 int sbt
, dbt
, sf
, df
, c
, p
;
1862 /* special delayed cast for char/short */
1863 /* XXX: in some cases (multiple cascaded casts), it may still
1865 if (vtop
->r
& VT_MUSTCAST
) {
1866 vtop
->r
&= ~VT_MUSTCAST
;
1867 force_charshort_cast(vtop
->type
.t
);
1870 /* bitfields first get cast to ints */
1871 if (vtop
->type
.t
& VT_BITFIELD
) {
1875 dbt
= type
->t
& (VT_BTYPE
| VT_UNSIGNED
);
1876 sbt
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
1881 c
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1882 p
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
);
1884 /* constant case: we can do it now */
1885 /* XXX: in ISOC, cannot do it if error in convert */
1886 if (sbt
== VT_FLOAT
)
1887 vtop
->c
.ld
= vtop
->c
.f
;
1888 else if (sbt
== VT_DOUBLE
)
1889 vtop
->c
.ld
= vtop
->c
.d
;
1892 if ((sbt
& VT_BTYPE
) == VT_LLONG
) {
1893 if (sbt
& VT_UNSIGNED
)
1894 vtop
->c
.ld
= vtop
->c
.ull
;
1896 vtop
->c
.ld
= vtop
->c
.ll
;
1898 if (sbt
& VT_UNSIGNED
)
1899 vtop
->c
.ld
= vtop
->c
.ui
;
1901 vtop
->c
.ld
= vtop
->c
.i
;
1904 if (dbt
== VT_FLOAT
)
1905 vtop
->c
.f
= (float)vtop
->c
.ld
;
1906 else if (dbt
== VT_DOUBLE
)
1907 vtop
->c
.d
= (double)vtop
->c
.ld
;
1908 } else if (sf
&& dbt
== (VT_LLONG
|VT_UNSIGNED
)) {
1909 vtop
->c
.ull
= (unsigned long long)vtop
->c
.ld
;
1910 } else if (sf
&& dbt
== VT_BOOL
) {
1911 vtop
->c
.i
= (vtop
->c
.ld
!= 0);
1914 vtop
->c
.ll
= (long long)vtop
->c
.ld
;
1915 else if (sbt
== (VT_LLONG
|VT_UNSIGNED
))
1916 vtop
->c
.ll
= vtop
->c
.ull
;
1917 else if (sbt
& VT_UNSIGNED
)
1918 vtop
->c
.ll
= vtop
->c
.ui
;
1919 #ifdef TCC_TARGET_X86_64
1920 else if (sbt
== VT_PTR
)
1923 else if (sbt
!= VT_LLONG
)
1924 vtop
->c
.ll
= vtop
->c
.i
;
1926 if (dbt
== (VT_LLONG
|VT_UNSIGNED
))
1927 vtop
->c
.ull
= vtop
->c
.ll
;
1928 else if (dbt
== VT_BOOL
)
1929 vtop
->c
.i
= (vtop
->c
.ll
!= 0);
1930 else if (dbt
!= VT_LLONG
) {
1932 if ((dbt
& VT_BTYPE
) == VT_BYTE
)
1934 else if ((dbt
& VT_BTYPE
) == VT_SHORT
)
1937 if(dbt
& VT_UNSIGNED
)
1938 vtop
->c
.ui
= ((unsigned int)vtop
->c
.ll
<< s
) >> s
;
1940 vtop
->c
.i
= ((int)vtop
->c
.ll
<< s
) >> s
;
1943 } else if (p
&& dbt
== VT_BOOL
) {
1946 } else if (!nocode_wanted
) {
1947 /* non constant case: generate code */
1949 /* convert from fp to fp */
1952 /* convert int to fp */
1955 /* convert fp to int */
1956 if (dbt
== VT_BOOL
) {
1960 /* we handle char/short/etc... with generic code */
1961 if (dbt
!= (VT_INT
| VT_UNSIGNED
) &&
1962 dbt
!= (VT_LLONG
| VT_UNSIGNED
) &&
1966 if (dbt
== VT_INT
&& (type
->t
& (VT_BTYPE
| VT_UNSIGNED
)) != dbt
) {
1967 /* additional cast for char/short... */
1972 #ifndef TCC_TARGET_X86_64
1973 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
) {
1974 if ((sbt
& VT_BTYPE
) != VT_LLONG
) {
1975 /* scalar to long long */
1976 /* machine independent conversion */
1978 /* generate high word */
1979 if (sbt
== (VT_INT
| VT_UNSIGNED
)) {
1983 if (sbt
== VT_PTR
) {
1984 /* cast from pointer to int before we apply
1985 shift operation, which pointers don't support*/
1986 gen_cast(&int_type
);
1992 /* patch second register */
1993 vtop
[-1].r2
= vtop
->r
;
1997 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
||
1998 (dbt
& VT_BTYPE
) == VT_PTR
||
1999 (dbt
& VT_BTYPE
) == VT_FUNC
) {
2000 if ((sbt
& VT_BTYPE
) != VT_LLONG
&&
2001 (sbt
& VT_BTYPE
) != VT_PTR
&&
2002 (sbt
& VT_BTYPE
) != VT_FUNC
) {
2003 /* need to convert from 32bit to 64bit */
2005 if (sbt
!= (VT_INT
| VT_UNSIGNED
)) {
2006 /* x86_64 specific: movslq */
2008 o(0xc0 + (REG_VALUE(r
) << 3) + REG_VALUE(r
));
2012 } else if (dbt
== VT_BOOL
) {
2013 /* scalar to bool */
2016 } else if ((dbt
& VT_BTYPE
) == VT_BYTE
||
2017 (dbt
& VT_BTYPE
) == VT_SHORT
) {
2018 if (sbt
== VT_PTR
) {
2019 vtop
->type
.t
= VT_INT
;
2020 tcc_warning("nonportable conversion from pointer to char/short");
2022 force_charshort_cast(dbt
);
2023 } else if ((dbt
& VT_BTYPE
) == VT_INT
) {
2025 if (sbt
== VT_LLONG
) {
2026 /* from long long: just take low order word */
2030 /* if lvalue and single word type, nothing to do because
2031 the lvalue already contains the real type size (see
2032 VT_LVAL_xxx constants) */
2035 } else if ((dbt
& VT_BTYPE
) == VT_PTR
&& !(vtop
->r
& VT_LVAL
)) {
2036 /* if we are casting between pointer types,
2037 we must update the VT_LVAL_xxx size */
2038 vtop
->r
= (vtop
->r
& ~VT_LVAL_TYPE
)
2039 | (lvalue_type(type
->ref
->type
.t
) & VT_LVAL_TYPE
);
2044 /* return type size as known at compile time. Put alignment at 'a' */
2045 ST_FUNC
int type_size(CType
*type
, int *a
)
2050 bt
= type
->t
& VT_BTYPE
;
2051 if (bt
== VT_STRUCT
) {
2056 } else if (bt
== VT_PTR
) {
2057 if (type
->t
& VT_ARRAY
) {
2061 ts
= type_size(&s
->type
, a
);
2063 if (ts
< 0 && s
->c
< 0)
2071 } else if (bt
== VT_LDOUBLE
) {
2073 return LDOUBLE_SIZE
;
2074 } else if (bt
== VT_DOUBLE
|| bt
== VT_LLONG
) {
2075 #ifdef TCC_TARGET_I386
2076 #ifdef TCC_TARGET_PE
2081 #elif defined(TCC_TARGET_ARM)
2091 } else if (bt
== VT_INT
|| bt
== VT_ENUM
|| bt
== VT_FLOAT
) {
2094 } else if (bt
== VT_SHORT
) {
2097 } else if (bt
== VT_QLONG
|| bt
== VT_QFLOAT
) {
2101 /* char, void, function, _Bool */
2107 /* push type size as known at runtime time on top of value stack. Put
2109 ST_FUNC
void vla_runtime_type_size(CType
*type
, int *a
)
2111 if (type
->t
& VT_VLA
) {
2112 vset(&int_type
, VT_LOCAL
|VT_LVAL
, type
->ref
->c
);
2114 vpushi(type_size(type
, a
));
2118 static void vla_sp_save(void) {
2119 if (!(vla_flags
& VLA_SP_LOC_SET
)) {
2120 *vla_sp_loc
= (loc
-= PTR_SIZE
);
2121 vla_flags
|= VLA_SP_LOC_SET
;
2123 if (!(vla_flags
& VLA_SP_SAVED
)) {
2124 gen_vla_sp_save(*vla_sp_loc
);
2125 vla_flags
|= VLA_SP_SAVED
;
2129 /* return the pointed type of t */
2130 static inline CType
*pointed_type(CType
*type
)
2132 return &type
->ref
->type
;
2135 /* modify type so that its it is a pointer to type. */
2136 ST_FUNC
void mk_pointer(CType
*type
)
2139 s
= sym_push(SYM_FIELD
, type
, 0, -1);
2140 type
->t
= VT_PTR
| (type
->t
& ~VT_TYPE
);
2144 /* compare function types. OLD functions match any new functions */
2145 static int is_compatible_func(CType
*type1
, CType
*type2
)
2151 if (!is_compatible_types(&s1
->type
, &s2
->type
))
2153 /* check func_call */
2154 if (FUNC_CALL(s1
->r
) != FUNC_CALL(s2
->r
))
2156 /* XXX: not complete */
2157 if (s1
->c
== FUNC_OLD
|| s2
->c
== FUNC_OLD
)
2161 while (s1
!= NULL
) {
2164 if (!is_compatible_parameter_types(&s1
->type
, &s2
->type
))
2174 /* return true if type1 and type2 are the same. If unqualified is
2175 true, qualifiers on the types are ignored.
2177 - enums are not checked as gcc __builtin_types_compatible_p ()
2179 static int compare_types(CType
*type1
, CType
*type2
, int unqualified
)
2183 t1
= type1
->t
& VT_TYPE
;
2184 t2
= type2
->t
& VT_TYPE
;
2186 /* strip qualifiers before comparing */
2187 t1
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2188 t2
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2190 /* XXX: bitfields ? */
2193 /* test more complicated cases */
2194 bt1
= t1
& VT_BTYPE
;
2195 if (bt1
== VT_PTR
) {
2196 type1
= pointed_type(type1
);
2197 type2
= pointed_type(type2
);
2198 return is_compatible_types(type1
, type2
);
2199 } else if (bt1
== VT_STRUCT
) {
2200 return (type1
->ref
== type2
->ref
);
2201 } else if (bt1
== VT_FUNC
) {
2202 return is_compatible_func(type1
, type2
);
2208 /* return true if type1 and type2 are exactly the same (including
2211 static int is_compatible_types(CType
*type1
, CType
*type2
)
2213 return compare_types(type1
,type2
,0);
2216 /* return true if type1 and type2 are the same (ignoring qualifiers).
2218 static int is_compatible_parameter_types(CType
*type1
, CType
*type2
)
2220 return compare_types(type1
,type2
,1);
2223 /* print a type. If 'varstr' is not NULL, then the variable is also
2224 printed in the type */
2226 /* XXX: add array and function pointers */
2227 static void type_to_str(char *buf
, int buf_size
,
2228 CType
*type
, const char *varstr
)
2235 t
= type
->t
& VT_TYPE
;
2238 if (t
& VT_CONSTANT
)
2239 pstrcat(buf
, buf_size
, "const ");
2240 if (t
& VT_VOLATILE
)
2241 pstrcat(buf
, buf_size
, "volatile ");
2242 if (t
& VT_UNSIGNED
)
2243 pstrcat(buf
, buf_size
, "unsigned ");
2273 tstr
= "long double";
2275 pstrcat(buf
, buf_size
, tstr
);
2279 if (bt
== VT_STRUCT
)
2283 pstrcat(buf
, buf_size
, tstr
);
2284 v
= type
->ref
->v
& ~SYM_STRUCT
;
2285 if (v
>= SYM_FIRST_ANOM
)
2286 pstrcat(buf
, buf_size
, "<anonymous>");
2288 pstrcat(buf
, buf_size
, get_tok_str(v
, NULL
));
2292 type_to_str(buf
, buf_size
, &s
->type
, varstr
);
2293 pstrcat(buf
, buf_size
, "(");
2295 while (sa
!= NULL
) {
2296 type_to_str(buf1
, sizeof(buf1
), &sa
->type
, NULL
);
2297 pstrcat(buf
, buf_size
, buf1
);
2300 pstrcat(buf
, buf_size
, ", ");
2302 pstrcat(buf
, buf_size
, ")");
2306 pstrcpy(buf1
, sizeof(buf1
), "*");
2308 pstrcat(buf1
, sizeof(buf1
), varstr
);
2309 type_to_str(buf
, buf_size
, &s
->type
, buf1
);
2313 pstrcat(buf
, buf_size
, " ");
2314 pstrcat(buf
, buf_size
, varstr
);
2319 /* verify type compatibility to store vtop in 'dt' type, and generate
2321 static void gen_assign_cast(CType
*dt
)
2323 CType
*st
, *type1
, *type2
, tmp_type1
, tmp_type2
;
2324 char buf1
[256], buf2
[256];
2327 st
= &vtop
->type
; /* source type */
2328 dbt
= dt
->t
& VT_BTYPE
;
2329 sbt
= st
->t
& VT_BTYPE
;
2331 tcc_error("Cannot assign void value");
2332 if (dt
->t
& VT_CONSTANT
)
2333 tcc_warning("assignment of read-only location");
2336 /* special cases for pointers */
2337 /* '0' can also be a pointer */
2338 if (is_null_pointer(vtop
))
2340 /* accept implicit pointer to integer cast with warning */
2341 if (is_integer_btype(sbt
)) {
2342 tcc_warning("assignment makes pointer from integer without a cast");
2345 type1
= pointed_type(dt
);
2346 /* a function is implicitely a function pointer */
2347 if (sbt
== VT_FUNC
) {
2348 if ((type1
->t
& VT_BTYPE
) != VT_VOID
&&
2349 !is_compatible_types(pointed_type(dt
), st
))
2350 tcc_warning("assignment from incompatible pointer type");
2355 type2
= pointed_type(st
);
2356 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
2357 (type2
->t
& VT_BTYPE
) == VT_VOID
) {
2358 /* void * can match anything */
2360 /* exact type match, except for unsigned */
2363 tmp_type1
.t
&= ~(VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
2364 tmp_type2
.t
&= ~(VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
2365 if (!is_compatible_types(&tmp_type1
, &tmp_type2
))
2366 tcc_warning("assignment from incompatible pointer type");
2368 /* check const and volatile */
2369 if ((!(type1
->t
& VT_CONSTANT
) && (type2
->t
& VT_CONSTANT
)) ||
2370 (!(type1
->t
& VT_VOLATILE
) && (type2
->t
& VT_VOLATILE
)))
2371 tcc_warning("assignment discards qualifiers from pointer target type");
2377 if (sbt
== VT_PTR
|| sbt
== VT_FUNC
) {
2378 tcc_warning("assignment makes integer from pointer without a cast");
2380 /* XXX: more tests */
2385 tmp_type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2386 tmp_type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2387 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
2389 type_to_str(buf1
, sizeof(buf1
), st
, NULL
);
2390 type_to_str(buf2
, sizeof(buf2
), dt
, NULL
);
2391 tcc_error("cannot cast '%s' to '%s'", buf1
, buf2
);
2399 /* store vtop in lvalue pushed on stack */
2400 ST_FUNC
void vstore(void)
2402 int sbt
, dbt
, ft
, r
, t
, size
, align
, bit_size
, bit_pos
, rc
, delayed_cast
;
2404 ft
= vtop
[-1].type
.t
;
2405 sbt
= vtop
->type
.t
& VT_BTYPE
;
2406 dbt
= ft
& VT_BTYPE
;
2407 if ((((sbt
== VT_INT
|| sbt
== VT_SHORT
) && dbt
== VT_BYTE
) ||
2408 (sbt
== VT_INT
&& dbt
== VT_SHORT
))
2409 && !(vtop
->type
.t
& VT_BITFIELD
)) {
2410 /* optimize char/short casts */
2411 delayed_cast
= VT_MUSTCAST
;
2412 vtop
->type
.t
= ft
& (VT_TYPE
& ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
)));
2413 /* XXX: factorize */
2414 if (ft
& VT_CONSTANT
)
2415 tcc_warning("assignment of read-only location");
2418 if (!(ft
& VT_BITFIELD
))
2419 gen_assign_cast(&vtop
[-1].type
);
2422 if (sbt
== VT_STRUCT
) {
2423 /* if structure, only generate pointer */
2424 /* structure assignment : generate memcpy */
2425 /* XXX: optimize if small size */
2426 if (!nocode_wanted
) {
2427 size
= type_size(&vtop
->type
, &align
);
2431 vtop
->type
.t
= VT_PTR
;
2434 /* address of memcpy() */
2437 vpush_global_sym(&func_old_type
, TOK_memcpy8
);
2438 else if(!(align
& 3))
2439 vpush_global_sym(&func_old_type
, TOK_memcpy4
);
2442 vpush_global_sym(&func_old_type
, TOK_memcpy
);
2447 vtop
->type
.t
= VT_PTR
;
2456 /* leave source on stack */
2457 } else if (ft
& VT_BITFIELD
) {
2458 /* bitfield store handling */
2459 bit_pos
= (ft
>> VT_STRUCT_SHIFT
) & 0x3f;
2460 bit_size
= (ft
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
2461 /* remove bit field info to avoid loops */
2462 vtop
[-1].type
.t
= ft
& ~(VT_BITFIELD
| (-1 << VT_STRUCT_SHIFT
));
2464 /* duplicate source into other register */
2469 if((ft
& VT_BTYPE
) == VT_BOOL
) {
2470 gen_cast(&vtop
[-1].type
);
2471 vtop
[-1].type
.t
= (vtop
[-1].type
.t
& ~VT_BTYPE
) | (VT_BYTE
| VT_UNSIGNED
);
2474 /* duplicate destination */
2476 vtop
[-1] = vtop
[-2];
2478 /* mask and shift source */
2479 if((ft
& VT_BTYPE
) != VT_BOOL
) {
2480 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2481 vpushll((1ULL << bit_size
) - 1ULL);
2483 vpushi((1 << bit_size
) - 1);
2489 /* load destination, mask and or with source */
2491 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2492 vpushll(~(((1ULL << bit_size
) - 1ULL) << bit_pos
));
2494 vpushi(~(((1 << bit_size
) - 1) << bit_pos
));
2501 /* pop off shifted source from "duplicate source..." above */
2505 #ifdef CONFIG_TCC_BCHECK
2506 /* bound check case */
2507 if (vtop
[-1].r
& VT_MUSTBOUND
) {
2513 if (!nocode_wanted
) {
2517 #ifdef TCC_TARGET_X86_64
2518 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
2520 } else if ((ft
& VT_BTYPE
) == VT_QFLOAT
) {
2525 r
= gv(rc
); /* generate value */
2526 /* if lvalue was saved on stack, must read it */
2527 if ((vtop
[-1].r
& VT_VALMASK
) == VT_LLOCAL
) {
2529 t
= get_reg(RC_INT
);
2530 #ifdef TCC_TARGET_X86_64
2535 sv
.r
= VT_LOCAL
| VT_LVAL
;
2536 sv
.c
.ul
= vtop
[-1].c
.ul
;
2538 vtop
[-1].r
= t
| VT_LVAL
;
2540 /* two word case handling : store second register at word + 4 (or +8 for x86-64) */
2541 #ifdef TCC_TARGET_X86_64
2542 if (((ft
& VT_BTYPE
) == VT_QLONG
) || ((ft
& VT_BTYPE
) == VT_QFLOAT
)) {
2543 int addr_type
= VT_LLONG
, load_size
= 8, load_type
= ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) ? VT_LLONG
: VT_DOUBLE
;
2545 if ((ft
& VT_BTYPE
) == VT_LLONG
) {
2546 int addr_type
= VT_INT
, load_size
= 4, load_type
= VT_INT
;
2548 vtop
[-1].type
.t
= load_type
;
2551 /* convert to int to increment easily */
2552 vtop
->type
.t
= addr_type
;
2558 vtop
[-1].type
.t
= load_type
;
2559 /* XXX: it works because r2 is spilled last ! */
2560 store(vtop
->r2
, vtop
- 1);
2566 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
2567 vtop
->r
|= delayed_cast
;
2571 /* post defines POST/PRE add. c is the token ++ or -- */
2572 ST_FUNC
void inc(int post
, int c
)
2575 vdup(); /* save lvalue */
2577 gv_dup(); /* duplicate value */
2582 vpushi(c
- TOK_MID
);
2584 vstore(); /* store value */
2586 vpop(); /* if post op, return saved value */
2589 /* Parse GNUC __attribute__ extension. Currently, the following
2590 extensions are recognized:
2591 - aligned(n) : set data/function alignment.
2592 - packed : force data alignment to 1
2593 - section(x) : generate data/code in this section.
2594 - unused : currently ignored, but may be used someday.
2595 - regparm(n) : pass function parameters in registers (i386 only)
2597 static void parse_attribute(AttributeDef
*ad
)
2601 while (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
) {
2605 while (tok
!= ')') {
2606 if (tok
< TOK_IDENT
)
2607 expect("attribute name");
2615 expect("section name");
2616 ad
->section
= find_section(tcc_state
, (char *)tokc
.cstr
->data
);
2624 expect("alias(\"target\")");
2625 ad
->alias_target
= /* save string as token, for later */
2626 tok_alloc((char*)tokc
.cstr
->data
, tokc
.cstr
->size
-1)->tok
;
2635 if (n
<= 0 || (n
& (n
- 1)) != 0)
2636 tcc_error("alignment must be a positive power of two");
2653 /* currently, no need to handle it because tcc does not
2654 track unused objects */
2658 /* currently, no need to handle it because tcc does not
2659 track unused objects */
2664 ad
->func_call
= FUNC_CDECL
;
2669 ad
->func_call
= FUNC_STDCALL
;
2671 #ifdef TCC_TARGET_I386
2681 ad
->func_call
= FUNC_FASTCALL1
+ n
- 1;
2687 ad
->func_call
= FUNC_FASTCALLW
;
2694 ad
->mode
= VT_LLONG
+ 1;
2697 ad
->mode
= VT_SHORT
+ 1;
2700 ad
->mode
= VT_INT
+ 1;
2703 tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok
, NULL
));
2710 ad
->func_export
= 1;
2713 ad
->func_import
= 1;
2716 if (tcc_state
->warn_unsupported
)
2717 tcc_warning("'%s' attribute ignored", get_tok_str(t
, NULL
));
2718 /* skip parameters */
2720 int parenthesis
= 0;
2724 else if (tok
== ')')
2727 } while (parenthesis
&& tok
!= -1);
2740 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
2741 static void struct_decl(CType
*type
, int u
, int tdef
)
2743 int a
, v
, size
, align
, maxalign
, c
, offset
;
2744 int bit_size
, bit_pos
, bsize
, bt
, lbit_pos
, prevbt
;
2745 Sym
*s
, *ss
, *ass
, **ps
;
2749 a
= tok
; /* save decl type */
2754 /* struct already defined ? return it */
2756 expect("struct/union/enum name");
2760 tcc_error("invalid type");
2762 } else if (tok
>= TOK_IDENT
&& !tdef
)
2763 tcc_error("unknown struct/union/enum");
2769 /* we put an undefined size for struct/union */
2770 s
= sym_push(v
| SYM_STRUCT
, &type1
, 0, -1);
2771 s
->r
= 0; /* default alignment is zero as gcc */
2772 /* put struct/union/enum name in type */
2780 tcc_error("struct/union/enum already defined");
2781 /* cannot be empty */
2783 /* non empty enums are not allowed */
2784 if (a
== TOK_ENUM
) {
2788 expect("identifier");
2794 /* enum symbols have static storage */
2795 ss
= sym_push(v
, &int_type
, VT_CONST
, c
);
2796 ss
->type
.t
|= VT_STATIC
;
2801 /* NOTE: we accept a trailing comma */
2805 s
->c
= type_size(&int_type
, &align
);
2813 while (tok
!= '}') {
2814 parse_btype(&btype
, &ad
);
2820 type_decl(&type1
, &ad
, &v
, TYPE_DIRECT
| TYPE_ABSTRACT
);
2821 if (v
== 0 && (type1
.t
& VT_BTYPE
) != VT_STRUCT
)
2822 expect("identifier");
2823 if ((type1
.t
& VT_BTYPE
) == VT_FUNC
||
2824 (type1
.t
& (VT_TYPEDEF
| VT_STATIC
| VT_EXTERN
| VT_INLINE
)))
2825 tcc_error("invalid type for '%s'",
2826 get_tok_str(v
, NULL
));
2830 bit_size
= expr_const();
2831 /* XXX: handle v = 0 case for messages */
2833 tcc_error("negative width in bit-field '%s'",
2834 get_tok_str(v
, NULL
));
2835 if (v
&& bit_size
== 0)
2836 tcc_error("zero width for bit-field '%s'",
2837 get_tok_str(v
, NULL
));
2839 size
= type_size(&type1
, &align
);
2841 if (align
< ad
.aligned
)
2843 } else if (ad
.packed
) {
2845 } else if (*tcc_state
->pack_stack_ptr
) {
2846 if (align
> *tcc_state
->pack_stack_ptr
)
2847 align
= *tcc_state
->pack_stack_ptr
;
2850 if (bit_size
>= 0) {
2851 bt
= type1
.t
& VT_BTYPE
;
2858 tcc_error("bitfields must have scalar type");
2860 if (bit_size
> bsize
) {
2861 tcc_error("width of '%s' exceeds its type",
2862 get_tok_str(v
, NULL
));
2863 } else if (bit_size
== bsize
) {
2864 /* no need for bit fields */
2866 } else if (bit_size
== 0) {
2867 /* XXX: what to do if only padding in a
2869 /* zero size: means to pad */
2872 /* we do not have enough room ?
2873 did the type change?
2875 if ((bit_pos
+ bit_size
) > bsize
||
2876 bt
!= prevbt
|| a
== TOK_UNION
)
2879 /* XXX: handle LSB first */
2880 type1
.t
|= VT_BITFIELD
|
2881 (bit_pos
<< VT_STRUCT_SHIFT
) |
2882 (bit_size
<< (VT_STRUCT_SHIFT
+ 6));
2883 bit_pos
+= bit_size
;
2889 if (v
!= 0 || (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
2890 /* add new memory data only if starting
2892 if (lbit_pos
== 0) {
2893 if (a
== TOK_STRUCT
) {
2894 c
= (c
+ align
- 1) & -align
;
2903 if (align
> maxalign
)
2907 printf("add field %s offset=%d",
2908 get_tok_str(v
, NULL
), offset
);
2909 if (type1
.t
& VT_BITFIELD
) {
2910 printf(" pos=%d size=%d",
2911 (type1
.t
>> VT_STRUCT_SHIFT
) & 0x3f,
2912 (type1
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f);
2917 if (v
== 0 && (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
2919 while ((ass
= ass
->next
) != NULL
) {
2920 ss
= sym_push(ass
->v
, &ass
->type
, 0, offset
+ ass
->c
);
2925 ss
= sym_push(v
| SYM_FIELD
, &type1
, 0, offset
);
2929 if (tok
== ';' || tok
== TOK_EOF
)
2936 /* store size and alignment */
2937 s
->c
= (c
+ maxalign
- 1) & -maxalign
;
2943 /* return 0 if no type declaration. otherwise, return the basic type
2946 static int parse_btype(CType
*type
, AttributeDef
*ad
)
2948 int t
, u
, type_found
, typespec_found
, typedef_found
;
2952 memset(ad
, 0, sizeof(AttributeDef
));
2960 /* currently, we really ignore extension */
2970 if ((t
& VT_BTYPE
) != 0)
2971 tcc_error("too many basic types");
2987 if ((t
& VT_BTYPE
) == VT_DOUBLE
) {
2988 #ifndef TCC_TARGET_PE
2989 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
2991 } else if ((t
& VT_BTYPE
) == VT_LONG
) {
2992 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3006 if ((t
& VT_BTYPE
) == VT_LONG
) {
3007 #ifdef TCC_TARGET_PE
3008 t
= (t
& ~VT_BTYPE
) | VT_DOUBLE
;
3010 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3018 struct_decl(&type1
, VT_ENUM
, t
& VT_TYPEDEF
);
3021 type
->ref
= type1
.ref
;
3025 struct_decl(&type1
, VT_STRUCT
, t
& VT_TYPEDEF
);
3028 /* type modifiers */
3081 /* GNUC attribute */
3082 case TOK_ATTRIBUTE1
:
3083 case TOK_ATTRIBUTE2
:
3084 parse_attribute(ad
);
3087 t
= (t
& ~VT_BTYPE
) | u
;
3095 parse_expr_type(&type1
);
3096 /* remove all storage modifiers except typedef */
3097 type1
.t
&= ~(VT_STORAGE
&~VT_TYPEDEF
);
3100 if (typespec_found
|| typedef_found
)
3103 if (!s
|| !(s
->type
.t
& VT_TYPEDEF
))
3106 t
|= (s
->type
.t
& ~VT_TYPEDEF
);
3107 type
->ref
= s
->type
.ref
;
3109 /* get attributes from typedef */
3110 if (0 == ad
->aligned
)
3111 ad
->aligned
= FUNC_ALIGN(s
->r
);
3112 if (0 == ad
->func_call
)
3113 ad
->func_call
= FUNC_CALL(s
->r
);
3114 ad
->packed
|= FUNC_PACKED(s
->r
);
3123 if ((t
& (VT_SIGNED
|VT_UNSIGNED
)) == (VT_SIGNED
|VT_UNSIGNED
))
3124 tcc_error("signed and unsigned modifier");
3125 if (tcc_state
->char_is_unsigned
) {
3126 if ((t
& (VT_SIGNED
|VT_UNSIGNED
|VT_BTYPE
)) == VT_BYTE
)
3131 /* long is never used as type */
3132 if ((t
& VT_BTYPE
) == VT_LONG
)
3133 #if !defined TCC_TARGET_X86_64 || defined TCC_TARGET_PE
3134 t
= (t
& ~VT_BTYPE
) | VT_INT
;
3136 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3142 /* convert a function parameter type (array to pointer and function to
3143 function pointer) */
3144 static inline void convert_parameter_type(CType
*pt
)
3146 /* remove const and volatile qualifiers (XXX: const could be used
3147 to indicate a const function parameter */
3148 pt
->t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3149 /* array must be transformed to pointer according to ANSI C */
3151 if ((pt
->t
& VT_BTYPE
) == VT_FUNC
) {
3156 ST_FUNC
void parse_asm_str(CString
*astr
)
3159 /* read the string */
3161 expect("string constant");
3163 while (tok
== TOK_STR
) {
3164 /* XXX: add \0 handling too ? */
3165 cstr_cat(astr
, tokc
.cstr
->data
);
3168 cstr_ccat(astr
, '\0');
3171 /* Parse an asm label and return the label
3172 * Don't forget to free the CString in the caller! */
3173 static void asm_label_instr(CString
*astr
)
3176 parse_asm_str(astr
);
3179 printf("asm_alias: \"%s\"\n", (char *)astr
->data
);
3183 static void post_type(CType
*type
, AttributeDef
*ad
)
3185 int n
, l
, t1
, arg_size
, align
;
3186 Sym
**plast
, *s
, *first
;
3191 /* function declaration */
3199 /* read param name and compute offset */
3200 if (l
!= FUNC_OLD
) {
3201 if (!parse_btype(&pt
, &ad1
)) {
3203 tcc_error("invalid type");
3210 if ((pt
.t
& VT_BTYPE
) == VT_VOID
&& tok
== ')')
3212 type_decl(&pt
, &ad1
, &n
, TYPE_DIRECT
| TYPE_ABSTRACT
);
3213 if ((pt
.t
& VT_BTYPE
) == VT_VOID
)
3214 tcc_error("parameter declared as void");
3215 arg_size
+= (type_size(&pt
, &align
) + PTR_SIZE
- 1) / PTR_SIZE
;
3220 expect("identifier");
3224 convert_parameter_type(&pt
);
3225 s
= sym_push(n
| SYM_FIELD
, &pt
, 0, 0);
3231 if (l
== FUNC_NEW
&& tok
== TOK_DOTS
) {
3238 /* if no parameters, then old type prototype */
3242 /* NOTE: const is ignored in returned type as it has a special
3243 meaning in gcc / C++ */
3244 type
->t
&= ~VT_CONSTANT
;
3245 /* some ancient pre-K&R C allows a function to return an array
3246 and the array brackets to be put after the arguments, such
3247 that "int c()[]" means something like "int[] c()" */
3250 skip(']'); /* only handle simple "[]" */
3253 /* we push a anonymous symbol which will contain the function prototype */
3254 ad
->func_args
= arg_size
;
3255 s
= sym_push(SYM_FIELD
, type
, INT_ATTR(ad
), l
);
3259 } else if (tok
== '[') {
3260 /* array definition */
3262 if (tok
== TOK_RESTRICT1
)
3267 if (!local_stack
|| nocode_wanted
)
3268 vpushi(expr_const());
3270 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3273 tcc_error("invalid array size");
3275 if (!is_integer_btype(vtop
->type
.t
& VT_BTYPE
))
3276 tcc_error("size of variable length array should be an integer");
3281 /* parse next post type */
3282 post_type(type
, ad
);
3283 if (type
->t
== VT_FUNC
)
3284 tcc_error("declaration of an array of functions");
3285 t1
|= type
->t
& VT_VLA
;
3288 loc
-= type_size(&int_type
, &align
);
3292 vla_runtime_type_size(type
, &align
);
3294 vset(&int_type
, VT_LOCAL
|VT_LVAL
, loc
);
3301 /* we push an anonymous symbol which will contain the array
3303 s
= sym_push(SYM_FIELD
, type
, 0, n
);
3304 type
->t
= (t1
? VT_VLA
: VT_ARRAY
) | VT_PTR
;
3309 /* Parse a type declaration (except basic type), and return the type
3310 in 'type'. 'td' is a bitmask indicating which kind of type decl is
3311 expected. 'type' should contain the basic type. 'ad' is the
3312 attribute definition of the basic type. It can be modified by
3315 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
)
3318 CType type1
, *type2
;
3319 int qualifiers
, storage
;
3321 while (tok
== '*') {
3329 qualifiers
|= VT_CONSTANT
;
3334 qualifiers
|= VT_VOLATILE
;
3342 type
->t
|= qualifiers
;
3345 /* XXX: clarify attribute handling */
3346 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3347 parse_attribute(ad
);
3349 /* recursive type */
3350 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
3351 type1
.t
= 0; /* XXX: same as int */
3354 /* XXX: this is not correct to modify 'ad' at this point, but
3355 the syntax is not clear */
3356 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3357 parse_attribute(ad
);
3358 type_decl(&type1
, ad
, v
, td
);
3361 /* type identifier */
3362 if (tok
>= TOK_IDENT
&& (td
& TYPE_DIRECT
)) {
3366 if (!(td
& TYPE_ABSTRACT
))
3367 expect("identifier");
3371 storage
= type
->t
& VT_STORAGE
;
3372 type
->t
&= ~VT_STORAGE
;
3373 if (storage
& VT_STATIC
) {
3374 int saved_nocode_wanted
= nocode_wanted
;
3376 post_type(type
, ad
);
3377 nocode_wanted
= saved_nocode_wanted
;
3379 post_type(type
, ad
);
3381 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3382 parse_attribute(ad
);
3386 /* append type at the end of type1 */
3399 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
3400 ST_FUNC
int lvalue_type(int t
)
3405 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
3407 else if (bt
== VT_SHORT
)
3411 if (t
& VT_UNSIGNED
)
3412 r
|= VT_LVAL_UNSIGNED
;
3416 /* indirection with full error checking and bound check */
3417 ST_FUNC
void indir(void)
3419 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
) {
3420 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FUNC
)
3424 if ((vtop
->r
& VT_LVAL
) && !nocode_wanted
)
3426 vtop
->type
= *pointed_type(&vtop
->type
);
3427 /* Arrays and functions are never lvalues */
3428 if (!(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_VLA
)
3429 && (vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
3430 vtop
->r
|= lvalue_type(vtop
->type
.t
);
3431 /* if bound checking, the referenced pointer must be checked */
3432 #ifdef CONFIG_TCC_BCHECK
3433 if (tcc_state
->do_bounds_check
)
3434 vtop
->r
|= VT_MUSTBOUND
;
3439 /* pass a parameter to a function and do type checking and casting */
3440 static void gfunc_param_typed(Sym
*func
, Sym
*arg
)
3445 func_type
= func
->c
;
3446 if (func_type
== FUNC_OLD
||
3447 (func_type
== FUNC_ELLIPSIS
&& arg
== NULL
)) {
3448 /* default casting : only need to convert float to double */
3449 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
) {
3453 } else if (arg
== NULL
) {
3454 tcc_error("too many arguments to function");
3457 type
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
3458 gen_assign_cast(&type
);
3462 /* parse an expression of the form '(type)' or '(expr)' and return its
3464 static void parse_expr_type(CType
*type
)
3470 if (parse_btype(type
, &ad
)) {
3471 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3478 static void parse_type(CType
*type
)
3483 if (!parse_btype(type
, &ad
)) {
3486 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3489 static void vpush_tokc(int t
)
3494 vsetc(&type
, VT_CONST
, &tokc
);
3497 ST_FUNC
void unary(void)
3499 int n
, t
, align
, size
, r
, sizeof_caller
;
3503 static int in_sizeof
= 0;
3505 sizeof_caller
= in_sizeof
;
3507 /* XXX: GCC 2.95.3 does not generate a table although it should be
3521 vpush_tokc(VT_INT
| VT_UNSIGNED
);
3525 vpush_tokc(VT_LLONG
);
3529 vpush_tokc(VT_LLONG
| VT_UNSIGNED
);
3533 vpush_tokc(VT_FLOAT
);
3537 vpush_tokc(VT_DOUBLE
);
3541 vpush_tokc(VT_LDOUBLE
);
3544 case TOK___FUNCTION__
:
3546 goto tok_identifier
;
3552 /* special function name identifier */
3553 len
= strlen(funcname
) + 1;
3554 /* generate char[len] type */
3559 vpush_ref(&type
, data_section
, data_section
->data_offset
, len
);
3560 ptr
= section_ptr_add(data_section
, len
);
3561 memcpy(ptr
, funcname
, len
);
3566 #ifdef TCC_TARGET_PE
3567 t
= VT_SHORT
| VT_UNSIGNED
;
3573 /* string parsing */
3576 if (tcc_state
->warn_write_strings
)
3581 memset(&ad
, 0, sizeof(AttributeDef
));
3582 decl_initializer_alloc(&type
, &ad
, VT_CONST
, 2, 0, NULL
, 0);
3587 if (parse_btype(&type
, &ad
)) {
3588 type_decl(&type
, &ad
, &n
, TYPE_ABSTRACT
);
3590 /* check ISOC99 compound literal */
3592 /* data is allocated locally by default */
3597 /* all except arrays are lvalues */
3598 if (!(type
.t
& VT_ARRAY
))
3599 r
|= lvalue_type(type
.t
);
3600 memset(&ad
, 0, sizeof(AttributeDef
));
3601 decl_initializer_alloc(&type
, &ad
, r
, 1, 0, NULL
, 0);
3603 if (sizeof_caller
) {
3610 } else if (tok
== '{') {
3611 /* save all registers */
3613 /* statement expression : we do not accept break/continue
3614 inside as GCC does */
3615 block(NULL
, NULL
, NULL
, NULL
, 0, 1);
3630 /* functions names must be treated as function pointers,
3631 except for unary '&' and sizeof. Since we consider that
3632 functions are not lvalues, we only have to handle it
3633 there and in function calls. */
3634 /* arrays can also be used although they are not lvalues */
3635 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
&&
3636 !(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_LLOCAL
))
3638 mk_pointer(&vtop
->type
);
3644 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3646 boolean
.t
= VT_BOOL
;
3648 vtop
->c
.i
= !vtop
->c
.i
;
3649 } else if ((vtop
->r
& VT_VALMASK
) == VT_CMP
)
3650 vtop
->c
.i
= vtop
->c
.i
^ 1;
3653 vseti(VT_JMP
, gtst(1, 0));
3664 /* in order to force cast, we add zero */
3666 if ((vtop
->type
.t
& VT_BTYPE
) == VT_PTR
)
3667 tcc_error("pointer not accepted for unary plus");
3677 unary_type(&type
); // Perform a in_sizeof = 0;
3678 size
= type_size(&type
, &align
);
3679 if (t
== TOK_SIZEOF
) {
3680 if (!(type
.t
& VT_VLA
)) {
3682 tcc_error("sizeof applied to an incomplete type");
3685 vla_runtime_type_size(&type
, &align
);
3690 vtop
->type
.t
|= VT_UNSIGNED
;
3693 case TOK_builtin_types_compatible_p
:
3702 type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3703 type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3704 vpushi(is_compatible_types(&type1
, &type2
));
3707 case TOK_builtin_constant_p
:
3709 int saved_nocode_wanted
, res
;
3712 saved_nocode_wanted
= nocode_wanted
;
3715 res
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
3717 nocode_wanted
= saved_nocode_wanted
;
3722 case TOK_builtin_frame_address
:
3728 if (tok
!= TOK_CINT
|| tokc
.i
< 0) {
3729 tcc_error("__builtin_frame_address only takes positive integers");
3736 vset(&type
, VT_LOCAL
, 0); /* local frame */
3738 mk_pointer(&vtop
->type
);
3739 indir(); /* -> parent frame */
3743 #ifdef TCC_TARGET_X86_64
3744 #ifdef TCC_TARGET_PE
3745 case TOK_builtin_va_start
:
3753 if ((vtop
->r
& VT_VALMASK
) != VT_LOCAL
)
3754 tcc_error("__builtin_va_start expects a local variable");
3755 vtop
->r
&= ~(VT_LVAL
| VT_REF
);
3756 vtop
->type
= char_pointer_type
;
3761 case TOK_builtin_va_arg_types
:
3769 vpushi(classify_x86_64_va_arg(&type
));
3789 goto tok_identifier
;
3791 /* allow to take the address of a label */
3792 if (tok
< TOK_UIDENT
)
3793 expect("label identifier");
3794 s
= label_find(tok
);
3796 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
3798 if (s
->r
== LABEL_DECLARED
)
3799 s
->r
= LABEL_FORWARD
;
3802 s
->type
.t
= VT_VOID
;
3803 mk_pointer(&s
->type
);
3804 s
->type
.t
|= VT_STATIC
;
3806 vset(&s
->type
, VT_CONST
| VT_SYM
, 0);
3811 // special qnan , snan and infinity values
3813 vpush64(VT_DOUBLE
, 0x7ff8000000000000ULL
);
3817 vpush64(VT_DOUBLE
, 0x7ff0000000000001ULL
);
3821 vpush64(VT_DOUBLE
, 0x7ff0000000000000ULL
);
3830 expect("identifier");
3834 tcc_error("'%s' undeclared", get_tok_str(t
, NULL
));
3835 /* for simple function calls, we tolerate undeclared
3836 external reference to int() function */
3837 if (tcc_state
->warn_implicit_function_declaration
)
3838 tcc_warning("implicit declaration of function '%s'",
3839 get_tok_str(t
, NULL
));
3840 s
= external_global_sym(t
, &func_old_type
, 0);
3842 if ((s
->type
.t
& (VT_STATIC
| VT_INLINE
| VT_BTYPE
)) ==
3843 (VT_STATIC
| VT_INLINE
| VT_FUNC
)) {
3844 /* if referencing an inline function, then we generate a
3845 symbol to it if not already done. It will have the
3846 effect to generate code for it at the end of the
3847 compilation unit. Inline function as always
3848 generated in the text section. */
3850 put_extern_sym(s
, text_section
, 0, 0);
3851 r
= VT_SYM
| VT_CONST
;
3855 vset(&s
->type
, r
, s
->c
);
3856 /* if forward reference, we must point to s */
3857 if (vtop
->r
& VT_SYM
) {
3864 /* post operations */
3866 if (tok
== TOK_INC
|| tok
== TOK_DEC
) {
3869 } else if (tok
== '.' || tok
== TOK_ARROW
) {
3872 if (tok
== TOK_ARROW
)
3874 qualifiers
= vtop
->type
.t
& (VT_CONSTANT
| VT_VOLATILE
);
3878 /* expect pointer on structure */
3879 if ((vtop
->type
.t
& VT_BTYPE
) != VT_STRUCT
)
3880 expect("struct or union");
3884 while ((s
= s
->next
) != NULL
) {
3889 tcc_error("field not found: %s", get_tok_str(tok
& ~SYM_FIELD
, NULL
));
3890 /* add field offset to pointer */
3891 vtop
->type
= char_pointer_type
; /* change type to 'char *' */
3894 /* change type to field type, and set to lvalue */
3895 vtop
->type
= s
->type
;
3896 vtop
->type
.t
|= qualifiers
;
3897 /* an array is never an lvalue */
3898 if (!(vtop
->type
.t
& VT_ARRAY
)) {
3899 vtop
->r
|= lvalue_type(vtop
->type
.t
);
3900 #ifdef CONFIG_TCC_BCHECK
3901 /* if bound checking, the referenced pointer must be checked */
3902 if (tcc_state
->do_bounds_check
)
3903 vtop
->r
|= VT_MUSTBOUND
;
3907 } else if (tok
== '[') {
3913 } else if (tok
== '(') {
3919 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
3920 /* pointer test (no array accepted) */
3921 if ((vtop
->type
.t
& (VT_BTYPE
| VT_ARRAY
)) == VT_PTR
) {
3922 vtop
->type
= *pointed_type(&vtop
->type
);
3923 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
)
3927 expect("function pointer");
3930 vtop
->r
&= ~VT_LVAL
; /* no lvalue */
3932 /* get return type */
3935 sa
= s
->next
; /* first parameter */
3938 /* compute first implicit argument if a structure is returned */
3939 if ((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
3941 sret
= gfunc_sret(&s
->type
, &ret
.type
, &ret_align
);
3943 /* get some space for the returned structure */
3944 size
= type_size(&s
->type
, &align
);
3945 loc
= (loc
- size
) & -align
;
3947 ret
.r
= VT_LOCAL
| VT_LVAL
;
3948 /* pass it as 'int' to avoid structure arg passing
3950 vseti(VT_LOCAL
, loc
);
3960 /* return in register */
3961 if (is_float(ret
.type
.t
)) {
3962 ret
.r
= reg_fret(ret
.type
.t
);
3963 #ifdef TCC_TARGET_X86_64
3964 if ((ret
.type
.t
& VT_BTYPE
) == VT_QFLOAT
)
3968 #ifdef TCC_TARGET_X86_64
3969 if ((ret
.type
.t
& VT_BTYPE
) == VT_QLONG
)
3971 if ((ret
.type
.t
& VT_BTYPE
) == VT_LLONG
)
3981 gfunc_param_typed(s
, sa
);
3991 tcc_error("too few arguments to function");
3993 if (!nocode_wanted
) {
3994 gfunc_call(nb_args
);
3996 vtop
-= (nb_args
+ 1);
3999 vsetc(&ret
.type
, ret
.r
, &ret
.c
);
4001 /* handle packed struct return */
4002 if (((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) && !sret
) {
4004 size
= type_size(&s
->type
, &align
);
4005 loc
= (loc
- size
) & -align
;
4007 vset(&ret
.type
, VT_LOCAL
| VT_LVAL
, addr
);
4011 vset(&s
->type
, VT_LOCAL
| VT_LVAL
, addr
);
4019 ST_FUNC
void expr_prod(void)
4024 while (tok
== '*' || tok
== '/' || tok
== '%') {
4032 ST_FUNC
void expr_sum(void)
4037 while (tok
== '+' || tok
== '-') {
4045 static void expr_shift(void)
4050 while (tok
== TOK_SHL
|| tok
== TOK_SAR
) {
4058 static void expr_cmp(void)
4063 while ((tok
>= TOK_ULE
&& tok
<= TOK_GT
) ||
4064 tok
== TOK_ULT
|| tok
== TOK_UGE
) {
4072 static void expr_cmpeq(void)
4077 while (tok
== TOK_EQ
|| tok
== TOK_NE
) {
4085 static void expr_and(void)
4088 while (tok
== '&') {
4095 static void expr_xor(void)
4098 while (tok
== '^') {
4105 static void expr_or(void)
4108 while (tok
== '|') {
4115 /* XXX: fix this mess */
4116 static void expr_land_const(void)
4119 while (tok
== TOK_LAND
) {
4126 /* XXX: fix this mess */
4127 static void expr_lor_const(void)
4130 while (tok
== TOK_LOR
) {
4137 /* only used if non constant */
4138 static void expr_land(void)
4143 if (tok
== TOK_LAND
) {
4148 if (tok
!= TOK_LAND
) {
4158 static void expr_lor(void)
4163 if (tok
== TOK_LOR
) {
4168 if (tok
!= TOK_LOR
) {
4178 /* XXX: better constant handling */
4179 static void expr_cond(void)
4181 int tt
, u
, r1
, r2
, rc
, t1
, t2
, bt1
, bt2
;
4183 CType type
, type1
, type2
;
4190 boolean
.t
= VT_BOOL
;
4196 if (tok
!= ':' || !gnu_ext
) {
4211 if (vtop
!= vstack
) {
4212 /* needed to avoid having different registers saved in
4214 if (is_float(vtop
->type
.t
)) {
4216 #ifdef TCC_TARGET_X86_64
4217 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4227 if (tok
== ':' && gnu_ext
) {
4235 sv
= *vtop
; /* save value to handle it later */
4236 vtop
--; /* no vpop so that FP stack is not flushed */
4244 bt1
= t1
& VT_BTYPE
;
4246 bt2
= t2
& VT_BTYPE
;
4247 /* cast operands to correct type according to ISOC rules */
4248 if (is_float(bt1
) || is_float(bt2
)) {
4249 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
4250 type
.t
= VT_LDOUBLE
;
4251 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
4256 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
4257 /* cast to biggest op */
4259 /* convert to unsigned if it does not fit in a long long */
4260 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
4261 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
4262 type
.t
|= VT_UNSIGNED
;
4263 } else if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
4264 /* If one is a null ptr constant the result type
4266 if (is_null_pointer (vtop
))
4268 else if (is_null_pointer (&sv
))
4270 /* XXX: test pointer compatibility, C99 has more elaborate
4274 } else if (bt1
== VT_FUNC
|| bt2
== VT_FUNC
) {
4275 /* XXX: test function pointer compatibility */
4276 type
= bt1
== VT_FUNC
? type1
: type2
;
4277 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
4278 /* XXX: test structure compatibility */
4279 type
= bt1
== VT_STRUCT
? type1
: type2
;
4280 } else if (bt1
== VT_VOID
|| bt2
== VT_VOID
) {
4281 /* NOTE: as an extension, we accept void on only one side */
4284 /* integer operations */
4286 /* convert to unsigned if it does not fit in an integer */
4287 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
4288 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
4289 type
.t
|= VT_UNSIGNED
;
4292 /* now we convert second operand */
4294 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4297 if (is_float(type
.t
)) {
4299 #ifdef TCC_TARGET_X86_64
4300 if ((type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4304 } else if ((type
.t
& VT_BTYPE
) == VT_LLONG
) {
4305 /* for long longs, we use fixed registers to avoid having
4306 to handle a complicated move */
4311 /* this is horrible, but we must also convert first
4315 /* put again first value and cast it */
4318 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4321 move_reg(r2
, r1
, type
.t
);
4328 static void expr_eq(void)
4334 (tok
>= TOK_A_MOD
&& tok
<= TOK_A_DIV
) ||
4335 tok
== TOK_A_XOR
|| tok
== TOK_A_OR
||
4336 tok
== TOK_A_SHL
|| tok
== TOK_A_SAR
) {
4351 ST_FUNC
void gexpr(void)
4362 /* parse an expression and return its type without any side effect. */
4363 static void expr_type(CType
*type
)
4365 int saved_nocode_wanted
;
4367 saved_nocode_wanted
= nocode_wanted
;
4372 nocode_wanted
= saved_nocode_wanted
;
4375 /* parse a unary expression and return its type without any side
4377 static void unary_type(CType
*type
)
4389 /* parse a constant expression and return value in vtop. */
4390 static void expr_const1(void)
4399 /* parse an integer constant and return its value. */
4400 ST_FUNC
int expr_const(void)
4404 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
4405 expect("constant expression");
4411 /* return the label token if current token is a label, otherwise
4413 static int is_label(void)
4417 /* fast test first */
4418 if (tok
< TOK_UIDENT
)
4420 /* no need to save tokc because tok is an identifier */
4427 unget_tok(last_tok
);
4432 static void label_or_decl(int l
)
4436 /* fast test first */
4437 if (tok
>= TOK_UIDENT
)
4439 /* no need to save tokc because tok is an identifier */
4443 unget_tok(last_tok
);
4446 unget_tok(last_tok
);
4451 static void block(int *bsym
, int *csym
, int *case_sym
, int *def_sym
,
4452 int case_reg
, int is_expr
)
4455 Sym
*s
, *frame_bottom
;
4457 /* generate line number info */
4458 if (tcc_state
->do_debug
&&
4459 (last_line_num
!= file
->line_num
|| last_ind
!= ind
)) {
4460 put_stabn(N_SLINE
, 0, file
->line_num
, ind
- func_ind
);
4462 last_line_num
= file
->line_num
;
4466 /* default return value is (void) */
4468 vtop
->type
.t
= VT_VOID
;
4471 if (tok
== TOK_IF
) {
4478 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4480 if (c
== TOK_ELSE
) {
4484 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4485 gsym(d
); /* patch else jmp */
4488 } else if (tok
== TOK_WHILE
) {
4496 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4500 } else if (tok
== '{') {
4502 int block_vla_sp_loc
, *saved_vla_sp_loc
, saved_vla_flags
;
4505 /* record local declaration stack position */
4507 frame_bottom
= sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
4508 frame_bottom
->next
= scope_stack_bottom
;
4509 scope_stack_bottom
= frame_bottom
;
4510 llabel
= local_label_stack
;
4512 /* save VLA state */
4513 block_vla_sp_loc
= *(saved_vla_sp_loc
= vla_sp_loc
);
4514 if (saved_vla_sp_loc
!= &vla_sp_root_loc
)
4515 vla_sp_loc
= &block_vla_sp_loc
;
4517 saved_vla_flags
= vla_flags
;
4518 vla_flags
|= VLA_NEED_NEW_FRAME
;
4520 /* handle local labels declarations */
4521 if (tok
== TOK_LABEL
) {
4524 if (tok
< TOK_UIDENT
)
4525 expect("label identifier");
4526 label_push(&local_label_stack
, tok
, LABEL_DECLARED
);
4536 while (tok
!= '}') {
4537 label_or_decl(VT_LOCAL
);
4541 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
4544 /* pop locally defined labels */
4545 label_pop(&local_label_stack
, llabel
);
4547 /* XXX: this solution makes only valgrind happy...
4548 triggered by gcc.c-torture/execute/20000917-1.c */
4550 switch(vtop
->type
.t
& VT_BTYPE
) {
4555 for(p
=vtop
->type
.ref
;p
;p
=p
->prev
)
4557 tcc_error("unsupported expression type");
4560 /* pop locally defined symbols */
4561 scope_stack_bottom
= scope_stack_bottom
->next
;
4562 sym_pop(&local_stack
, s
);
4564 /* Pop VLA frames and restore stack pointer if required */
4565 if (saved_vla_sp_loc
!= &vla_sp_root_loc
)
4566 *saved_vla_sp_loc
= block_vla_sp_loc
;
4567 if (vla_sp_loc
!= (saved_vla_sp_loc
== &vla_sp_root_loc
? &vla_sp_root_loc
: &block_vla_sp_loc
)) {
4568 vla_sp_loc
= saved_vla_sp_loc
;
4569 gen_vla_sp_restore(*vla_sp_loc
);
4571 vla_flags
= (vla_flags
& ~VLA_SCOPE_FLAGS
) | (saved_vla_flags
& VLA_SCOPE_FLAGS
);
4574 } else if (tok
== TOK_RETURN
) {
4578 gen_assign_cast(&func_vt
);
4579 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
4580 CType type
, ret_type
;
4582 if (gfunc_sret(&func_vt
, &ret_type
, &ret_align
)) {
4583 /* if returning structure, must copy it to implicit
4584 first pointer arg location */
4587 vset(&type
, VT_LOCAL
| VT_LVAL
, func_vc
);
4590 /* copy structure value to pointer */
4593 /* returning structure packed into registers */
4594 int size
, addr
, align
;
4595 size
= type_size(&func_vt
,&align
);
4596 if ((vtop
->r
!= (VT_LOCAL
| VT_LVAL
) || (vtop
->c
.i
& (ret_align
-1)))
4597 && (align
& (ret_align
-1))) {
4598 loc
= (loc
- size
) & -align
;
4601 vset(&type
, VT_LOCAL
| VT_LVAL
, addr
);
4604 vset(&ret_type
, VT_LOCAL
| VT_LVAL
, addr
);
4606 vtop
->type
= ret_type
;
4607 if (is_float(ret_type
.t
))
4608 gv(rc_fret(ret_type
.t
));
4612 } else if (is_float(func_vt
.t
)) {
4613 gv(rc_fret(func_vt
.t
));
4617 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
4620 rsym
= gjmp(rsym
); /* jmp */
4621 } else if (tok
== TOK_BREAK
) {
4624 tcc_error("cannot break");
4625 *bsym
= gjmp(*bsym
);
4628 } else if (tok
== TOK_CONTINUE
) {
4631 tcc_error("cannot continue");
4632 *csym
= gjmp(*csym
);
4635 } else if (tok
== TOK_FOR
) {
4640 frame_bottom
= sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
4641 frame_bottom
->next
= scope_stack_bottom
;
4642 scope_stack_bottom
= frame_bottom
;
4644 /* c99 for-loop init decl? */
4645 if (!decl0(VT_LOCAL
, 1)) {
4646 /* no, regular for-loop init expr */
4670 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4674 scope_stack_bottom
= scope_stack_bottom
->next
;
4675 sym_pop(&local_stack
, s
);
4677 if (tok
== TOK_DO
) {
4682 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4693 if (tok
== TOK_SWITCH
) {
4697 /* XXX: other types than integer */
4698 case_reg
= gv(RC_INT
);
4702 b
= gjmp(0); /* jump to first case */
4704 block(&a
, csym
, &b
, &c
, case_reg
, 0);
4705 /* if no default, jmp after switch */
4713 if (tok
== TOK_CASE
) {
4720 if (gnu_ext
&& tok
== TOK_DOTS
) {
4724 tcc_warning("empty case range");
4726 /* since a case is like a label, we must skip it with a jmp */
4733 *case_sym
= gtst(1, 0);
4736 *case_sym
= gtst(1, 0);
4740 *case_sym
= gtst(1, *case_sym
);
4745 goto block_after_label
;
4747 if (tok
== TOK_DEFAULT
) {
4753 tcc_error("too many 'default'");
4756 goto block_after_label
;
4758 if (tok
== TOK_GOTO
) {
4760 if (tok
== '*' && gnu_ext
) {
4764 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
)
4767 } else if (tok
>= TOK_UIDENT
) {
4768 s
= label_find(tok
);
4769 /* put forward definition if needed */
4771 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
4773 if (s
->r
== LABEL_DECLARED
)
4774 s
->r
= LABEL_FORWARD
;
4776 /* label already defined */
4777 if (vla_flags
& VLA_IN_SCOPE
) {
4778 /* If VLAs are in use, save the current stack pointer and
4779 reset the stack pointer to what it was at function entry
4780 (label will restore stack pointer in inner scopes) */
4782 gen_vla_sp_restore(vla_sp_root_loc
);
4784 if (s
->r
& LABEL_FORWARD
)
4785 s
->jnext
= gjmp(s
->jnext
);
4787 gjmp_addr(s
->jnext
);
4790 expect("label identifier");
4793 } else if (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
) {
4799 if (vla_flags
& VLA_IN_SCOPE
) {
4800 /* save/restore stack pointer across label
4801 this is a no-op when combined with the load immediately
4802 after the label unless we arrive via goto */
4807 if (s
->r
== LABEL_DEFINED
)
4808 tcc_error("duplicate label '%s'", get_tok_str(s
->v
, NULL
));
4810 s
->r
= LABEL_DEFINED
;
4812 s
= label_push(&global_label_stack
, b
, LABEL_DEFINED
);
4815 if (vla_flags
& VLA_IN_SCOPE
) {
4816 gen_vla_sp_restore(*vla_sp_loc
);
4817 vla_flags
|= VLA_NEED_NEW_FRAME
;
4819 /* we accept this, but it is a mistake */
4822 tcc_warning("deprecated use of label at end of compound statement");
4826 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
4829 /* expression case */
4844 /* t is the array or struct type. c is the array or struct
4845 address. cur_index/cur_field is the pointer to the current
4846 value. 'size_only' is true if only size info is needed (only used
4848 static void decl_designator(CType
*type
, Section
*sec
, unsigned long c
,
4849 int *cur_index
, Sym
**cur_field
,
4853 int notfirst
, index
, index_last
, align
, l
, nb_elems
, elem_size
;
4859 if (gnu_ext
&& (l
= is_label()) != 0)
4861 while (tok
== '[' || tok
== '.') {
4863 if (!(type
->t
& VT_ARRAY
))
4864 expect("array type");
4867 index
= expr_const();
4868 if (index
< 0 || (s
->c
>= 0 && index
>= s
->c
))
4869 expect("invalid index");
4870 if (tok
== TOK_DOTS
&& gnu_ext
) {
4872 index_last
= expr_const();
4873 if (index_last
< 0 ||
4874 (s
->c
>= 0 && index_last
>= s
->c
) ||
4876 expect("invalid index");
4882 *cur_index
= index_last
;
4883 type
= pointed_type(type
);
4884 elem_size
= type_size(type
, &align
);
4885 c
+= index
* elem_size
;
4886 /* NOTE: we only support ranges for last designator */
4887 nb_elems
= index_last
- index
+ 1;
4888 if (nb_elems
!= 1) {
4897 if ((type
->t
& VT_BTYPE
) != VT_STRUCT
)
4898 expect("struct/union type");
4911 /* XXX: fix this mess by using explicit storage field */
4913 type1
.t
|= (type
->t
& ~VT_TYPE
);
4927 if (type
->t
& VT_ARRAY
) {
4929 type
= pointed_type(type
);
4930 c
+= index
* type_size(type
, &align
);
4934 tcc_error("too many field init");
4935 /* XXX: fix this mess by using explicit storage field */
4937 type1
.t
|= (type
->t
& ~VT_TYPE
);
4942 decl_initializer(type
, sec
, c
, 0, size_only
);
4944 /* XXX: make it more general */
4945 if (!size_only
&& nb_elems
> 1) {
4946 unsigned long c_end
;
4951 tcc_error("range init not supported yet for dynamic storage");
4952 c_end
= c
+ nb_elems
* elem_size
;
4953 if (c_end
> sec
->data_allocated
)
4954 section_realloc(sec
, c_end
);
4955 src
= sec
->data
+ c
;
4957 for(i
= 1; i
< nb_elems
; i
++) {
4959 memcpy(dst
, src
, elem_size
);
4965 #define EXPR_CONST 1
4968 /* store a value or an expression directly in global data or in local array */
4969 static void init_putv(CType
*type
, Section
*sec
, unsigned long c
,
4970 int v
, int expr_type
)
4972 int saved_global_expr
, bt
, bit_pos
, bit_size
;
4974 unsigned long long bit_mask
;
4982 /* compound literals must be allocated globally in this case */
4983 saved_global_expr
= global_expr
;
4986 global_expr
= saved_global_expr
;
4987 /* NOTE: symbols are accepted */
4988 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) != VT_CONST
)
4989 tcc_error("initializer element is not constant");
4997 dtype
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
5000 /* XXX: not portable */
5001 /* XXX: generate error if incorrect relocation */
5002 gen_assign_cast(&dtype
);
5003 bt
= type
->t
& VT_BTYPE
;
5004 /* we'll write at most 12 bytes */
5005 if (c
+ 12 > sec
->data_allocated
) {
5006 section_realloc(sec
, c
+ 12);
5008 ptr
= sec
->data
+ c
;
5009 /* XXX: make code faster ? */
5010 if (!(type
->t
& VT_BITFIELD
)) {
5015 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5016 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
5017 bit_mask
= (1LL << bit_size
) - 1;
5019 if ((vtop
->r
& VT_SYM
) &&
5025 (bt
== VT_INT
&& bit_size
!= 32)))
5026 tcc_error("initializer element is not computable at load time");
5029 vtop
->c
.i
= (vtop
->c
.i
!= 0);
5031 *(char *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5034 *(short *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5037 *(double *)ptr
= vtop
->c
.d
;
5040 *(long double *)ptr
= vtop
->c
.ld
;
5043 *(long long *)ptr
|= (vtop
->c
.ll
& bit_mask
) << bit_pos
;
5046 if (vtop
->r
& VT_SYM
) {
5047 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
5049 *(int *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5054 vset(&dtype
, VT_LOCAL
|VT_LVAL
, c
);
5061 /* put zeros for variable based init */
5062 static void init_putz(CType
*t
, Section
*sec
, unsigned long c
, int size
)
5065 /* nothing to do because globals are already set to zero */
5067 vpush_global_sym(&func_old_type
, TOK_memset
);
5075 /* 't' contains the type and storage info. 'c' is the offset of the
5076 object in section 'sec'. If 'sec' is NULL, it means stack based
5077 allocation. 'first' is true if array '{' must be read (multi
5078 dimension implicit array init handling). 'size_only' is true if
5079 size only evaluation is wanted (only for arrays). */
5080 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
,
5081 int first
, int size_only
)
5083 int index
, array_length
, n
, no_oblock
, nb
, parlevel
, parlevel1
, i
;
5084 int size1
, align1
, expr_type
;
5088 if (type
->t
& VT_VLA
) {
5091 /* save current stack pointer */
5092 if (vla_flags
& VLA_NEED_NEW_FRAME
) {
5094 vla_flags
= VLA_IN_SCOPE
;
5095 vla_sp_loc
= &vla_sp_loc_tmp
;
5098 vla_runtime_type_size(type
, &a
);
5099 gen_vla_alloc(type
, a
);
5100 vset(type
, VT_LOCAL
|VT_LVAL
, c
);
5104 } else if (type
->t
& VT_ARRAY
) {
5108 t1
= pointed_type(type
);
5109 size1
= type_size(t1
, &align1
);
5112 if ((first
&& tok
!= TOK_LSTR
&& tok
!= TOK_STR
) ||
5115 tcc_error("character array initializer must be a literal,"
5116 " optionally enclosed in braces");
5121 /* only parse strings here if correct type (otherwise: handle
5122 them as ((w)char *) expressions */
5123 if ((tok
== TOK_LSTR
&&
5124 #ifdef TCC_TARGET_PE
5125 (t1
->t
& VT_BTYPE
) == VT_SHORT
&& (t1
->t
& VT_UNSIGNED
)
5127 (t1
->t
& VT_BTYPE
) == VT_INT
5129 ) || (tok
== TOK_STR
&& (t1
->t
& VT_BTYPE
) == VT_BYTE
)) {
5130 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5135 /* compute maximum number of chars wanted */
5137 cstr_len
= cstr
->size
;
5139 cstr_len
= cstr
->size
/ sizeof(nwchar_t
);
5142 if (n
>= 0 && nb
> (n
- array_length
))
5143 nb
= n
- array_length
;
5146 tcc_warning("initializer-string for array is too long");
5147 /* in order to go faster for common case (char
5148 string in global variable, we handle it
5150 if (sec
&& tok
== TOK_STR
&& size1
== 1) {
5151 memcpy(sec
->data
+ c
+ array_length
, cstr
->data
, nb
);
5155 ch
= ((unsigned char *)cstr
->data
)[i
];
5157 ch
= ((nwchar_t
*)cstr
->data
)[i
];
5158 init_putv(t1
, sec
, c
+ (array_length
+ i
) * size1
,
5166 /* only add trailing zero if enough storage (no
5167 warning in this case since it is standard) */
5168 if (n
< 0 || array_length
< n
) {
5170 init_putv(t1
, sec
, c
+ (array_length
* size1
), 0, EXPR_VAL
);
5176 while (tok
!= '}') {
5177 decl_designator(type
, sec
, c
, &index
, NULL
, size_only
);
5178 if (n
>= 0 && index
>= n
)
5179 tcc_error("index too large");
5180 /* must put zero in holes (note that doing it that way
5181 ensures that it even works with designators) */
5182 if (!size_only
&& array_length
< index
) {
5183 init_putz(t1
, sec
, c
+ array_length
* size1
,
5184 (index
- array_length
) * size1
);
5187 if (index
> array_length
)
5188 array_length
= index
;
5189 /* special test for multi dimensional arrays (may not
5190 be strictly correct if designators are used at the
5192 if (index
>= n
&& no_oblock
)
5201 /* put zeros at the end */
5202 if (!size_only
&& n
>= 0 && array_length
< n
) {
5203 init_putz(t1
, sec
, c
+ array_length
* size1
,
5204 (n
- array_length
) * size1
);
5206 /* patch type size if needed */
5208 s
->c
= array_length
;
5209 } else if ((type
->t
& VT_BTYPE
) == VT_STRUCT
&&
5210 (sec
|| !first
|| tok
== '{')) {
5213 /* NOTE: the previous test is a specific case for automatic
5214 struct/union init */
5215 /* XXX: union needs only one init */
5217 /* XXX: this test is incorrect for local initializers
5218 beginning with ( without {. It would be much more difficult
5219 to do it correctly (ideally, the expression parser should
5220 be used in all cases) */
5226 while (tok
== '(') {
5230 if (!parse_btype(&type1
, &ad1
))
5232 type_decl(&type1
, &ad1
, &n
, TYPE_ABSTRACT
);
5234 if (!is_assignable_types(type
, &type1
))
5235 tcc_error("invalid type for cast");
5240 if (first
|| tok
== '{') {
5249 while (tok
!= '}') {
5250 decl_designator(type
, sec
, c
, NULL
, &f
, size_only
);
5252 if (!size_only
&& array_length
< index
) {
5253 init_putz(type
, sec
, c
+ array_length
,
5254 index
- array_length
);
5256 index
= index
+ type_size(&f
->type
, &align1
);
5257 if (index
> array_length
)
5258 array_length
= index
;
5260 /* gr: skip fields from same union - ugly. */
5262 ///printf("index: %2d %08x -- %2d %08x\n", f->c, f->type.t, f->next->c, f->next->type.t);
5263 /* test for same offset */
5264 if (f
->next
->c
!= f
->c
)
5266 /* if yes, test for bitfield shift */
5267 if ((f
->type
.t
& VT_BITFIELD
) && (f
->next
->type
.t
& VT_BITFIELD
)) {
5268 int bit_pos_1
= (f
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5269 int bit_pos_2
= (f
->next
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5270 //printf("bitfield %d %d\n", bit_pos_1, bit_pos_2);
5271 if (bit_pos_1
!= bit_pos_2
)
5278 if (no_oblock
&& f
== NULL
)
5284 /* put zeros at the end */
5285 if (!size_only
&& array_length
< n
) {
5286 init_putz(type
, sec
, c
+ array_length
,
5295 } else if (tok
== '{') {
5297 decl_initializer(type
, sec
, c
, first
, size_only
);
5299 } else if (size_only
) {
5300 /* just skip expression */
5301 parlevel
= parlevel1
= 0;
5302 while ((parlevel
> 0 || parlevel1
> 0 ||
5303 (tok
!= '}' && tok
!= ',')) && tok
!= -1) {
5306 else if (tok
== ')')
5308 else if (tok
== '{')
5310 else if (tok
== '}')
5315 /* currently, we always use constant expression for globals
5316 (may change for scripting case) */
5317 expr_type
= EXPR_CONST
;
5319 expr_type
= EXPR_ANY
;
5320 init_putv(type
, sec
, c
, 0, expr_type
);
5324 /* parse an initializer for type 't' if 'has_init' is non zero, and
5325 allocate space in local or global data space ('r' is either
5326 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
5327 variable 'v' with an associated name represented by 'asm_label' of
5328 scope 'scope' is declared before initializers are parsed. If 'v' is
5329 zero, then a reference to the new object is put in the value stack.
5330 If 'has_init' is 2, a special parsing is done to handle string
5332 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
,
5333 int has_init
, int v
, char *asm_label
,
5336 int size
, align
, addr
, data_offset
;
5338 ParseState saved_parse_state
= {0};
5339 TokenString init_str
;
5341 Sym
*flexible_array
;
5343 flexible_array
= NULL
;
5344 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
5345 Sym
*field
= type
->ref
->next
;
5348 field
= field
->next
;
5349 if (field
->type
.t
& VT_ARRAY
&& field
->type
.ref
->c
< 0)
5350 flexible_array
= field
;
5354 size
= type_size(type
, &align
);
5355 /* If unknown size, we must evaluate it before
5356 evaluating initializers because
5357 initializers can generate global data too
5358 (e.g. string pointers or ISOC99 compound
5359 literals). It also simplifies local
5360 initializers handling */
5361 tok_str_new(&init_str
);
5362 if (size
< 0 || (flexible_array
&& has_init
)) {
5364 tcc_error("unknown type size");
5365 /* get all init string */
5366 if (has_init
== 2) {
5367 /* only get strings */
5368 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5369 tok_str_add_tok(&init_str
);
5374 while (level
> 0 || (tok
!= ',' && tok
!= ';')) {
5376 tcc_error("unexpected end of file in initializer");
5377 tok_str_add_tok(&init_str
);
5380 else if (tok
== '}') {
5390 tok_str_add(&init_str
, -1);
5391 tok_str_add(&init_str
, 0);
5394 save_parse_state(&saved_parse_state
);
5396 macro_ptr
= init_str
.str
;
5398 decl_initializer(type
, NULL
, 0, 1, 1);
5399 /* prepare second initializer parsing */
5400 macro_ptr
= init_str
.str
;
5403 /* if still unknown size, error */
5404 size
= type_size(type
, &align
);
5406 tcc_error("unknown type size");
5409 size
+= flexible_array
->type
.ref
->c
* pointed_size(&flexible_array
->type
);
5410 /* take into account specified alignment if bigger */
5412 if (ad
->aligned
> align
)
5413 align
= ad
->aligned
;
5414 } else if (ad
->packed
) {
5417 if ((r
& VT_VALMASK
) == VT_LOCAL
) {
5419 #ifdef CONFIG_TCC_BCHECK
5420 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5424 loc
= (loc
- size
) & -align
;
5426 #ifdef CONFIG_TCC_BCHECK
5427 /* handles bounds */
5428 /* XXX: currently, since we do only one pass, we cannot track
5429 '&' operators, so we add only arrays */
5430 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5431 unsigned long *bounds_ptr
;
5432 /* add padding between regions */
5434 /* then add local bound info */
5435 bounds_ptr
= section_ptr_add(lbounds_section
, 2 * sizeof(unsigned long));
5436 bounds_ptr
[0] = addr
;
5437 bounds_ptr
[1] = size
;
5441 /* local variable */
5442 sym_push(v
, type
, r
, addr
);
5444 /* push local reference */
5445 vset(type
, r
, addr
);
5451 if (v
&& scope
== VT_CONST
) {
5452 /* see if the symbol was already defined */
5455 if (!is_compatible_types(&sym
->type
, type
))
5456 tcc_error("incompatible types for redefinition of '%s'",
5457 get_tok_str(v
, NULL
));
5458 if (sym
->type
.t
& VT_EXTERN
) {
5459 /* if the variable is extern, it was not allocated */
5460 sym
->type
.t
&= ~VT_EXTERN
;
5461 /* set array size if it was ommited in extern
5463 if ((sym
->type
.t
& VT_ARRAY
) &&
5464 sym
->type
.ref
->c
< 0 &&
5466 sym
->type
.ref
->c
= type
->ref
->c
;
5468 /* we accept several definitions of the same
5469 global variable. this is tricky, because we
5470 must play with the SHN_COMMON type of the symbol */
5471 /* XXX: should check if the variable was already
5472 initialized. It is incorrect to initialized it
5474 /* no init data, we won't add more to the symbol */
5481 /* allocate symbol in corresponding section */
5486 else if (tcc_state
->nocommon
)
5490 data_offset
= sec
->data_offset
;
5491 data_offset
= (data_offset
+ align
- 1) & -align
;
5493 /* very important to increment global pointer at this time
5494 because initializers themselves can create new initializers */
5495 data_offset
+= size
;
5496 #ifdef CONFIG_TCC_BCHECK
5497 /* add padding if bound check */
5498 if (tcc_state
->do_bounds_check
)
5501 sec
->data_offset
= data_offset
;
5502 /* allocate section space to put the data */
5503 if (sec
->sh_type
!= SHT_NOBITS
&&
5504 data_offset
> sec
->data_allocated
)
5505 section_realloc(sec
, data_offset
);
5506 /* align section if needed */
5507 if (align
> sec
->sh_addralign
)
5508 sec
->sh_addralign
= align
;
5510 addr
= 0; /* avoid warning */
5514 if (scope
!= VT_CONST
|| !sym
) {
5515 sym
= sym_push(v
, type
, r
| VT_SYM
, 0);
5516 sym
->asm_label
= asm_label
;
5518 /* update symbol definition */
5520 put_extern_sym(sym
, sec
, addr
, size
);
5523 /* put a common area */
5524 put_extern_sym(sym
, NULL
, align
, size
);
5525 /* XXX: find a nicer way */
5526 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
5527 esym
->st_shndx
= SHN_COMMON
;
5532 /* push global reference */
5533 sym
= get_sym_ref(type
, sec
, addr
, size
);
5535 vsetc(type
, VT_CONST
| VT_SYM
, &cval
);
5538 /* patch symbol weakness */
5539 if (type
->t
& VT_WEAK
)
5541 #ifdef CONFIG_TCC_BCHECK
5542 /* handles bounds now because the symbol must be defined
5543 before for the relocation */
5544 if (tcc_state
->do_bounds_check
) {
5545 unsigned long *bounds_ptr
;
5547 greloc(bounds_section
, sym
, bounds_section
->data_offset
, R_DATA_PTR
);
5548 /* then add global bound info */
5549 bounds_ptr
= section_ptr_add(bounds_section
, 2 * sizeof(long));
5550 bounds_ptr
[0] = 0; /* relocated */
5551 bounds_ptr
[1] = size
;
5555 if (has_init
|| (type
->t
& VT_VLA
)) {
5556 decl_initializer(type
, sec
, addr
, 1, 0);
5557 /* restore parse state if needed */
5559 tok_str_free(init_str
.str
);
5560 restore_parse_state(&saved_parse_state
);
5562 /* patch flexible array member size back to -1, */
5563 /* for possible subsequent similar declarations */
5565 flexible_array
->type
.ref
->c
= -1;
5570 static void put_func_debug(Sym
*sym
)
5575 /* XXX: we put here a dummy type */
5576 snprintf(buf
, sizeof(buf
), "%s:%c1",
5577 funcname
, sym
->type
.t
& VT_STATIC
? 'f' : 'F');
5578 put_stabs_r(buf
, N_FUN
, 0, file
->line_num
, 0,
5579 cur_text_section
, sym
->c
);
5580 /* //gr gdb wants a line at the function */
5581 put_stabn(N_SLINE
, 0, file
->line_num
, 0);
5586 /* parse an old style function declaration list */
5587 /* XXX: check multiple parameter */
5588 static void func_decl_list(Sym
*func_sym
)
5595 /* parse each declaration */
5596 while (tok
!= '{' && tok
!= ';' && tok
!= ',' && tok
!= TOK_EOF
&&
5597 tok
!= TOK_ASM1
&& tok
!= TOK_ASM2
&& tok
!= TOK_ASM3
) {
5598 if (!parse_btype(&btype
, &ad
))
5599 expect("declaration list");
5600 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
5601 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
5603 /* we accept no variable after */
5607 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
5608 /* find parameter in function parameter list */
5611 if ((s
->v
& ~SYM_FIELD
) == v
)
5615 tcc_error("declaration for parameter '%s' but no such parameter",
5616 get_tok_str(v
, NULL
));
5618 /* check that no storage specifier except 'register' was given */
5619 if (type
.t
& VT_STORAGE
)
5620 tcc_error("storage class specified for '%s'", get_tok_str(v
, NULL
));
5621 convert_parameter_type(&type
);
5622 /* we can add the type (NOTE: it could be local to the function) */
5624 /* accept other parameters */
5635 /* parse a function defined by symbol 'sym' and generate its code in
5636 'cur_text_section' */
5637 static void gen_function(Sym
*sym
)
5639 int saved_nocode_wanted
= nocode_wanted
;
5641 ind
= cur_text_section
->data_offset
;
5642 /* NOTE: we patch the symbol size later */
5643 put_extern_sym(sym
, cur_text_section
, ind
, 0);
5644 funcname
= get_tok_str(sym
->v
, NULL
);
5646 /* Initialize VLA state */
5647 vla_sp_loc
= &vla_sp_root_loc
;
5648 vla_flags
= VLA_NEED_NEW_FRAME
;
5649 /* put debug symbol */
5650 if (tcc_state
->do_debug
)
5651 put_func_debug(sym
);
5652 /* push a dummy symbol to enable local sym storage */
5653 sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
5654 gfunc_prolog(&sym
->type
);
5656 block(NULL
, NULL
, NULL
, NULL
, 0, 0);
5659 cur_text_section
->data_offset
= ind
;
5660 label_pop(&global_label_stack
, NULL
);
5661 /* reset local stack */
5662 scope_stack_bottom
= NULL
;
5663 sym_pop(&local_stack
, NULL
);
5664 /* end of function */
5665 /* patch symbol size */
5666 ((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
].st_size
=
5668 /* patch symbol weakness (this definition overrules any prototype) */
5669 if (sym
->type
.t
& VT_WEAK
)
5671 if (tcc_state
->do_debug
) {
5672 put_stabn(N_FUN
, 0, 0, ind
- func_ind
);
5674 /* It's better to crash than to generate wrong code */
5675 cur_text_section
= NULL
;
5676 funcname
= ""; /* for safety */
5677 func_vt
.t
= VT_VOID
; /* for safety */
5678 ind
= 0; /* for safety */
5679 nocode_wanted
= saved_nocode_wanted
;
5682 ST_FUNC
void gen_inline_functions(void)
5685 int *str
, inline_generated
, i
;
5686 struct InlineFunc
*fn
;
5688 /* iterate while inline function are referenced */
5690 inline_generated
= 0;
5691 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
5692 fn
= tcc_state
->inline_fns
[i
];
5694 if (sym
&& sym
->c
) {
5695 /* the function was used: generate its code and
5696 convert it to a normal function */
5697 str
= fn
->token_str
;
5700 pstrcpy(file
->filename
, sizeof file
->filename
, fn
->filename
);
5701 sym
->r
= VT_SYM
| VT_CONST
;
5702 sym
->type
.t
&= ~VT_INLINE
;
5706 cur_text_section
= text_section
;
5708 macro_ptr
= NULL
; /* fail safe */
5710 inline_generated
= 1;
5713 if (!inline_generated
)
5716 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
5717 fn
= tcc_state
->inline_fns
[i
];
5718 str
= fn
->token_str
;
5721 dynarray_reset(&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
);
5724 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
5725 static int decl0(int l
, int is_for_loop_init
)
5733 if (!parse_btype(&btype
, &ad
)) {
5734 if (is_for_loop_init
)
5736 /* skip redundant ';' */
5737 /* XXX: find more elegant solution */
5742 if (l
== VT_CONST
&&
5743 (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
5744 /* global asm block */
5748 /* special test for old K&R protos without explicit int
5749 type. Only accepted when defining global data */
5750 if (l
== VT_LOCAL
|| tok
< TOK_DEFINE
)
5754 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
5755 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
5757 /* we accept no variable after */
5761 while (1) { /* iterate thru each declaration */
5762 char *asm_label
; // associated asm label
5764 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
5768 type_to_str(buf
, sizeof(buf
), t
, get_tok_str(v
, NULL
));
5769 printf("type = '%s'\n", buf
);
5772 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
5773 if ((type
.t
& VT_STATIC
) && (l
== VT_LOCAL
)) {
5774 tcc_error("function without file scope cannot be static");
5776 /* if old style function prototype, we accept a
5779 if (sym
->c
== FUNC_OLD
)
5780 func_decl_list(sym
);
5784 if (gnu_ext
&& (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
5787 asm_label_instr(&astr
);
5788 asm_label
= tcc_strdup(astr
.data
);
5791 /* parse one last attribute list, after asm label */
5792 parse_attribute(&ad
);
5797 #ifdef TCC_TARGET_PE
5799 type
.t
|= VT_IMPORT
;
5801 type
.t
|= VT_EXPORT
;
5805 tcc_error("cannot use local functions");
5806 if ((type
.t
& VT_BTYPE
) != VT_FUNC
)
5807 expect("function definition");
5809 /* reject abstract declarators in function definition */
5811 while ((sym
= sym
->next
) != NULL
)
5812 if (!(sym
->v
& ~SYM_FIELD
))
5813 expect("identifier");
5815 /* XXX: cannot do better now: convert extern line to static inline */
5816 if ((type
.t
& (VT_EXTERN
| VT_INLINE
)) == (VT_EXTERN
| VT_INLINE
))
5817 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
5821 if ((sym
->type
.t
& VT_BTYPE
) != VT_FUNC
)
5824 r
= sym
->type
.ref
->r
;
5827 tcc_error("redefinition of '%s'", get_tok_str(v
, NULL
));
5829 /* use func_call from prototype if not defined */
5830 if (FUNC_CALL(r
) != FUNC_CDECL
5831 && FUNC_CALL(type
.ref
->r
) == FUNC_CDECL
)
5832 FUNC_CALL(type
.ref
->r
) = FUNC_CALL(r
);
5834 /* use export from prototype */
5836 FUNC_EXPORT(type
.ref
->r
) = 1;
5838 /* use static from prototype */
5839 if (sym
->type
.t
& VT_STATIC
)
5840 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
5842 if (!is_compatible_types(&sym
->type
, &type
)) {
5844 tcc_error("incompatible types for redefinition of '%s'",
5845 get_tok_str(v
, NULL
));
5847 FUNC_PROTO(type
.ref
->r
) = 0;
5848 /* if symbol is already defined, then put complete type */
5851 /* put function symbol */
5852 sym
= global_identifier_push(v
, type
.t
, 0);
5853 sym
->type
.ref
= type
.ref
;
5856 /* static inline functions are just recorded as a kind
5857 of macro. Their code will be emitted at the end of
5858 the compilation unit only if they are used */
5859 if ((type
.t
& (VT_INLINE
| VT_STATIC
)) ==
5860 (VT_INLINE
| VT_STATIC
)) {
5861 TokenString func_str
;
5863 struct InlineFunc
*fn
;
5864 const char *filename
;
5866 tok_str_new(&func_str
);
5872 tcc_error("unexpected end of file");
5873 tok_str_add_tok(&func_str
);
5878 } else if (t
== '}') {
5880 if (block_level
== 0)
5884 tok_str_add(&func_str
, -1);
5885 tok_str_add(&func_str
, 0);
5886 filename
= file
? file
->filename
: "";
5887 fn
= tcc_malloc(sizeof *fn
+ strlen(filename
));
5888 strcpy(fn
->filename
, filename
);
5890 fn
->token_str
= func_str
.str
;
5891 dynarray_add((void ***)&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
, fn
);
5894 /* compute text section */
5895 cur_text_section
= ad
.section
;
5896 if (!cur_text_section
)
5897 cur_text_section
= text_section
;
5898 sym
->r
= VT_SYM
| VT_CONST
;
5903 if (btype
.t
& VT_TYPEDEF
) {
5904 /* save typedefed type */
5905 /* XXX: test storage specifiers ? */
5906 sym
= sym_push(v
, &type
, INT_ATTR(&ad
), 0);
5907 sym
->type
.t
|= VT_TYPEDEF
;
5910 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
5911 /* external function definition */
5912 /* specific case for func_call attribute */
5914 type
.ref
->r
= INT_ATTR(&ad
);
5915 } else if (!(type
.t
& VT_ARRAY
)) {
5916 /* not lvalue if array */
5917 r
|= lvalue_type(type
.t
);
5919 has_init
= (tok
== '=');
5920 if (has_init
&& (type
.t
& VT_VLA
))
5921 tcc_error("Variable length array cannot be initialized");
5922 if ((btype
.t
& VT_EXTERN
) || ((type
.t
& VT_BTYPE
) == VT_FUNC
) ||
5923 ((type
.t
& VT_ARRAY
) && (type
.t
& VT_STATIC
) &&
5924 !has_init
&& l
== VT_CONST
&& type
.ref
->c
< 0)) {
5925 /* external variable or function */
5926 /* NOTE: as GCC, uninitialized global static
5927 arrays of null size are considered as
5929 sym
= external_sym(v
, &type
, r
, asm_label
);
5931 if (type
.t
& VT_WEAK
)
5934 if (ad
.alias_target
) {
5939 alias_target
= sym_find(ad
.alias_target
);
5940 if (!alias_target
|| !alias_target
->c
)
5941 tcc_error("unsupported forward __alias__ attribute");
5942 esym
= &((Elf32_Sym
*)symtab_section
->data
)[alias_target
->c
];
5943 tsec
.sh_num
= esym
->st_shndx
;
5944 put_extern_sym2(sym
, &tsec
, esym
->st_value
, esym
->st_size
, 0);
5947 type
.t
|= (btype
.t
& VT_STATIC
); /* Retain "static". */
5948 if (type
.t
& VT_STATIC
)
5954 decl_initializer_alloc(&type
, &ad
, r
, has_init
, v
, asm_label
, l
);
5958 if (is_for_loop_init
)
5971 ST_FUNC
void decl(int l
)