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 vlas_in_scope
; /* number of VLAs that are currently in scope */
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 */
62 ST_DATA SValue __vstack
[1+VSTACK_SIZE
], *vtop
, *pvtop
;
64 ST_DATA
int const_wanted
; /* true if constant wanted */
65 ST_DATA
int nocode_wanted
; /* true if no code generation wanted for an expression */
66 ST_DATA
int global_expr
; /* true if compound literals must be allocated globally (used during initializers parsing */
67 ST_DATA CType func_vt
; /* current function return type (used by return instruction) */
68 ST_DATA
int func_var
; /* true if current function is variadic (used by return instruction) */
70 ST_DATA
int last_line_num
, last_ind
, func_ind
; /* debug last line number and pc */
71 ST_DATA
const 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_restore(void);
90 static void vla_sp_restore_root(void);
91 static int is_compatible_parameter_types(CType
*type1
, CType
*type2
);
92 static void expr_type(CType
*type
);
93 ST_FUNC
void vpush64(int ty
, unsigned long long v
);
94 ST_FUNC
void vpush(CType
*type
);
95 ST_FUNC
int gvtst(int inv
, int t
);
96 ST_FUNC
int is_btype_size(int bt
);
98 ST_INLN
int is_float(int t
)
102 return bt
== VT_LDOUBLE
|| bt
== VT_DOUBLE
|| bt
== VT_FLOAT
|| bt
== VT_QFLOAT
;
105 /* we use our own 'finite' function to avoid potential problems with
106 non standard math libs */
107 /* XXX: endianness dependent */
108 ST_FUNC
int ieee_finite(double d
)
111 memcpy(p
, &d
, sizeof(double));
112 return ((unsigned)((p
[1] | 0x800fffff) + 1)) >> 31;
115 ST_FUNC
void test_lvalue(void)
117 if (!(vtop
->r
& VT_LVAL
))
121 ST_FUNC
void check_vstack(void)
124 tcc_error("internal compiler error: vstack leak (%d)", vtop
- pvtop
);
127 /* ------------------------------------------------------------------------- */
128 /* symbol allocator */
129 static Sym
*__sym_malloc(void)
131 Sym
*sym_pool
, *sym
, *last_sym
;
134 sym_pool
= tcc_malloc(SYM_POOL_NB
* sizeof(Sym
));
135 dynarray_add(&sym_pools
, &nb_sym_pools
, sym_pool
);
137 last_sym
= sym_free_first
;
139 for(i
= 0; i
< SYM_POOL_NB
; i
++) {
140 sym
->next
= last_sym
;
144 sym_free_first
= last_sym
;
148 static inline Sym
*sym_malloc(void)
151 sym
= sym_free_first
;
153 sym
= __sym_malloc();
154 sym_free_first
= sym
->next
;
158 ST_INLN
void sym_free(Sym
*sym
)
160 sym
->next
= sym_free_first
;
161 tcc_free(sym
->asm_label
);
162 sym_free_first
= sym
;
165 /* push, without hashing */
166 ST_FUNC Sym
*sym_push2(Sym
**ps
, int v
, int t
, long c
)
169 if (ps
== &local_stack
) {
170 for (s
= *ps
; s
&& s
!= scope_stack_bottom
; s
= s
->prev
)
171 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
&& s
->v
== v
)
172 tcc_error("incompatible types for redefinition of '%s'",
173 get_tok_str(v
, NULL
));
191 /* find a symbol and return its associated structure. 's' is the top
192 of the symbol stack */
193 ST_FUNC Sym
*sym_find2(Sym
*s
, int v
)
205 /* structure lookup */
206 ST_INLN Sym
*struct_find(int v
)
209 if ((unsigned)v
>= (unsigned)(tok_ident
- TOK_IDENT
))
211 return table_ident
[v
]->sym_struct
;
214 /* find an identifier */
215 ST_INLN Sym
*sym_find(int v
)
218 if ((unsigned)v
>= (unsigned)(tok_ident
- TOK_IDENT
))
220 return table_ident
[v
]->sym_identifier
;
223 /* push a given symbol on the symbol stack */
224 ST_FUNC Sym
*sym_push(int v
, CType
*type
, int r
, int c
)
233 s
= sym_push2(ps
, v
, type
->t
, c
);
234 s
->type
.ref
= type
->ref
;
236 /* don't record fields or anonymous symbols */
238 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
239 /* record symbol in token array */
240 ts
= table_ident
[(v
& ~SYM_STRUCT
) - TOK_IDENT
];
242 ps
= &ts
->sym_struct
;
244 ps
= &ts
->sym_identifier
;
251 /* push a global identifier */
252 ST_FUNC Sym
*global_identifier_push(int v
, int t
, int c
)
255 s
= sym_push2(&global_stack
, v
, t
, c
);
256 /* don't record anonymous symbol */
257 if (v
< SYM_FIRST_ANOM
) {
258 ps
= &table_ident
[v
- TOK_IDENT
]->sym_identifier
;
259 /* modify the top most local identifier, so that
260 sym_identifier will point to 's' when popped */
262 ps
= &(*ps
)->prev_tok
;
269 /* pop symbols until top reaches 'b' */
270 ST_FUNC
void sym_pop(Sym
**ptop
, Sym
*b
)
280 /* remove symbol in token array */
282 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
283 ts
= table_ident
[(v
& ~SYM_STRUCT
) - TOK_IDENT
];
285 ps
= &ts
->sym_struct
;
287 ps
= &ts
->sym_identifier
;
296 static void weaken_symbol(Sym
*sym
)
298 sym
->type
.t
|= VT_WEAK
;
303 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
304 esym_type
= ELFW(ST_TYPE
)(esym
->st_info
);
305 esym
->st_info
= ELFW(ST_INFO
)(STB_WEAK
, esym_type
);
309 static void apply_visibility(Sym
*sym
, CType
*type
)
311 int vis
= sym
->type
.t
& VT_VIS_MASK
;
312 int vis2
= type
->t
& VT_VIS_MASK
;
313 if (vis
== (STV_DEFAULT
<< VT_VIS_SHIFT
))
315 else if (vis2
== (STV_DEFAULT
<< VT_VIS_SHIFT
))
318 vis
= (vis
< vis2
) ? vis
: vis2
;
319 sym
->type
.t
&= ~VT_VIS_MASK
;
325 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
326 vis
>>= VT_VIS_SHIFT
;
327 esym
->st_other
= (esym
->st_other
& ~ELFW(ST_VISIBILITY
)(-1)) | vis
;
331 /* ------------------------------------------------------------------------- */
333 ST_FUNC
void swap(int *p
, int *q
)
341 static void vsetc(CType
*type
, int r
, CValue
*vc
)
345 if (vtop
>= vstack
+ (VSTACK_SIZE
- 1))
346 tcc_error("memory full (vstack)");
347 /* cannot let cpu flags if other instruction are generated. Also
348 avoid leaving VT_JMP anywhere except on the top of the stack
349 because it would complicate the code generator. */
350 if (vtop
>= vstack
) {
351 v
= vtop
->r
& VT_VALMASK
;
352 if (v
== VT_CMP
|| (v
& ~1) == VT_JMP
)
362 /* push constant of type "type" with useless value */
363 ST_FUNC
void vpush(CType
*type
)
366 vsetc(type
, VT_CONST
, &cval
);
369 /* push integer constant */
370 ST_FUNC
void vpushi(int v
)
374 vsetc(&int_type
, VT_CONST
, &cval
);
377 /* push a pointer sized constant */
378 static void vpushs(addr_t v
)
382 vsetc(&size_type
, VT_CONST
, &cval
);
385 /* push arbitrary 64bit constant */
386 ST_FUNC
void vpush64(int ty
, unsigned long long v
)
393 vsetc(&ctype
, VT_CONST
, &cval
);
396 /* push long long constant */
397 static inline void vpushll(long long v
)
399 vpush64(VT_LLONG
, v
);
402 /* push a symbol value of TYPE */
403 static inline void vpushsym(CType
*type
, Sym
*sym
)
407 vsetc(type
, VT_CONST
| VT_SYM
, &cval
);
411 /* Return a static symbol pointing to a section */
412 ST_FUNC Sym
*get_sym_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
418 sym
= global_identifier_push(v
, type
->t
| VT_STATIC
, 0);
419 sym
->type
.ref
= type
->ref
;
420 sym
->r
= VT_CONST
| VT_SYM
;
421 put_extern_sym(sym
, sec
, offset
, size
);
425 /* push a reference to a section offset by adding a dummy symbol */
426 static void vpush_ref(CType
*type
, Section
*sec
, unsigned long offset
, unsigned long size
)
428 vpushsym(type
, get_sym_ref(type
, sec
, offset
, size
));
431 /* define a new external reference to a symbol 'v' of type 'u' */
432 ST_FUNC Sym
*external_global_sym(int v
, CType
*type
, int r
)
438 /* push forward reference */
439 s
= global_identifier_push(v
, type
->t
| VT_EXTERN
, 0);
440 s
->type
.ref
= type
->ref
;
441 s
->r
= r
| VT_CONST
| VT_SYM
;
446 /* define a new external reference to a symbol 'v' with alternate asm
447 name 'asm_label' of type 'u'. 'asm_label' is equal to NULL if there
448 is no alternate name (most cases) */
449 static Sym
*external_sym(int v
, CType
*type
, int r
, char *asm_label
)
455 /* push forward reference */
456 s
= sym_push(v
, type
, r
| VT_CONST
| VT_SYM
, 0);
457 s
->asm_label
= asm_label
;
458 s
->type
.t
|= VT_EXTERN
;
459 } else if (s
->type
.ref
== func_old_type
.ref
) {
460 s
->type
.ref
= type
->ref
;
461 s
->r
= r
| VT_CONST
| VT_SYM
;
462 s
->type
.t
|= VT_EXTERN
;
463 } else if (!is_compatible_types(&s
->type
, type
)) {
464 tcc_error("incompatible types for redefinition of '%s'",
465 get_tok_str(v
, NULL
));
467 /* Merge some storage attributes. */
468 if (type
->t
& VT_WEAK
)
471 if (type
->t
& VT_VIS_MASK
)
472 apply_visibility(s
, type
);
477 /* push a reference to global symbol v */
478 ST_FUNC
void vpush_global_sym(CType
*type
, int v
)
480 vpushsym(type
, external_global_sym(v
, type
, 0));
483 ST_FUNC
void vset(CType
*type
, int r
, int v
)
488 vsetc(type
, r
, &cval
);
491 static void vseti(int r
, int v
)
499 ST_FUNC
void vswap(void)
502 /* cannot let cpu flags if other instruction are generated. Also
503 avoid leaving VT_JMP anywhere except on the top of the stack
504 because it would complicate the code generator. */
505 if (vtop
>= vstack
) {
506 int v
= vtop
->r
& VT_VALMASK
;
507 if (v
== VT_CMP
|| (v
& ~1) == VT_JMP
)
514 /* XXX: +2% overall speed possible with optimized memswap
516 * memswap(&vtop[0], &vtop[1], sizeof *vtop);
520 ST_FUNC
void vpushv(SValue
*v
)
522 if (vtop
>= vstack
+ (VSTACK_SIZE
- 1))
523 tcc_error("memory full (vstack)");
528 static void vdup(void)
533 /* save r to the memory stack, and mark it as being free */
534 ST_FUNC
void save_reg(int r
)
536 int l
, saved
, size
, align
;
540 /* modify all stack values */
543 for(p
=vstack
;p
<=vtop
;p
++) {
544 if ((p
->r
& VT_VALMASK
) == r
||
545 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& (p
->r2
& VT_VALMASK
) == r
)) {
546 /* must save value on stack if not already done */
548 /* NOTE: must reload 'r' because r might be equal to r2 */
549 r
= p
->r
& VT_VALMASK
;
550 /* store register in the stack */
552 if ((p
->r
& VT_LVAL
) ||
553 (!is_float(type
->t
) && (type
->t
& VT_BTYPE
) != VT_LLONG
))
554 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
555 type
= &char_pointer_type
;
559 size
= type_size(type
, &align
);
560 loc
= (loc
- size
) & -align
;
562 sv
.r
= VT_LOCAL
| VT_LVAL
;
565 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
566 /* x86 specific: need to pop fp register ST0 if saved */
568 o(0xd8dd); /* fstp %st(0) */
571 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
572 /* special long long case */
573 if ((type
->t
& VT_BTYPE
) == VT_LLONG
) {
581 /* mark that stack entry as being saved on the stack */
582 if (p
->r
& VT_LVAL
) {
583 /* also clear the bounded flag because the
584 relocation address of the function was stored in
586 p
->r
= (p
->r
& ~(VT_VALMASK
| VT_BOUNDED
)) | VT_LLOCAL
;
588 p
->r
= lvalue_type(p
->type
.t
) | VT_LOCAL
;
596 #ifdef TCC_TARGET_ARM
597 /* find a register of class 'rc2' with at most one reference on stack.
598 * If none, call get_reg(rc) */
599 ST_FUNC
int get_reg_ex(int rc
, int rc2
)
604 for(r
=0;r
<NB_REGS
;r
++) {
605 if (reg_classes
[r
] & rc2
) {
608 for(p
= vstack
; p
<= vtop
; p
++) {
609 if ((p
->r
& VT_VALMASK
) == r
||
610 (p
->r2
& VT_VALMASK
) == r
)
621 /* find a free register of class 'rc'. If none, save one register */
622 ST_FUNC
int get_reg(int rc
)
627 /* find a free register */
628 for(r
=0;r
<NB_REGS
;r
++) {
629 if (reg_classes
[r
] & rc
) {
630 for(p
=vstack
;p
<=vtop
;p
++) {
631 if ((p
->r
& VT_VALMASK
) == r
||
632 (p
->r2
& VT_VALMASK
) == r
)
640 /* no register left : free the first one on the stack (VERY
641 IMPORTANT to start from the bottom to ensure that we don't
642 spill registers used in gen_opi()) */
643 for(p
=vstack
;p
<=vtop
;p
++) {
644 /* look at second register (if long long) */
645 r
= p
->r2
& VT_VALMASK
;
646 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
))
648 r
= p
->r
& VT_VALMASK
;
649 if (r
< VT_CONST
&& (reg_classes
[r
] & rc
)) {
655 /* Should never comes here */
659 /* save registers up to (vtop - n) stack entry */
660 ST_FUNC
void save_regs(int n
)
665 for(p
= vstack
;p
<= p1
; p
++) {
666 r
= p
->r
& VT_VALMASK
;
673 /* move register 's' (of type 't') to 'r', and flush previous value of r to memory
675 static void move_reg(int r
, int s
, int t
)
689 /* get address of vtop (vtop MUST BE an lvalue) */
690 ST_FUNC
void gaddrof(void)
692 if (vtop
->r
& VT_REF
&& !nocode_wanted
)
695 /* tricky: if saved lvalue, then we can go back to lvalue */
696 if ((vtop
->r
& VT_VALMASK
) == VT_LLOCAL
)
697 vtop
->r
= (vtop
->r
& ~(VT_VALMASK
| VT_LVAL_TYPE
)) | VT_LOCAL
| VT_LVAL
;
702 #ifdef CONFIG_TCC_BCHECK
703 /* generate lvalue bound code */
704 static void gbound(void)
709 vtop
->r
&= ~VT_MUSTBOUND
;
710 /* if lvalue, then use checking code before dereferencing */
711 if (vtop
->r
& VT_LVAL
) {
712 /* if not VT_BOUNDED value, then make one */
713 if (!(vtop
->r
& VT_BOUNDED
)) {
714 lval_type
= vtop
->r
& (VT_LVAL_TYPE
| VT_LVAL
);
715 /* must save type because we must set it to int to get pointer */
717 vtop
->type
.t
= VT_PTR
;
720 gen_bounded_ptr_add();
721 vtop
->r
|= lval_type
;
724 /* then check for dereferencing */
725 gen_bounded_ptr_deref();
730 /* store vtop a register belonging to class 'rc'. lvalues are
731 converted to values. Cannot be used if cannot be converted to
732 register value (such as structures). */
733 ST_FUNC
int gv(int rc
)
735 int r
, bit_pos
, bit_size
, size
, align
, i
;
738 /* NOTE: get_reg can modify vstack[] */
739 if (vtop
->type
.t
& VT_BITFIELD
) {
742 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
743 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
744 /* remove bit field info to avoid loops */
745 vtop
->type
.t
&= ~VT_BITFIELD
& ((1 << VT_STRUCT_SHIFT
) - 1);
746 /* cast to int to propagate signedness in following ops */
747 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
752 if((vtop
->type
.t
& VT_UNSIGNED
) ||
753 (vtop
->type
.t
& VT_BTYPE
) == VT_BOOL
)
754 type
.t
|= VT_UNSIGNED
;
756 /* generate shifts */
757 vpushi(bits
- (bit_pos
+ bit_size
));
759 vpushi(bits
- bit_size
);
760 /* NOTE: transformed to SHR if unsigned */
764 if (is_float(vtop
->type
.t
) &&
765 (vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
768 unsigned long offset
;
769 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
773 /* XXX: unify with initializers handling ? */
774 /* CPUs usually cannot use float constants, so we store them
775 generically in data segment */
776 size
= type_size(&vtop
->type
, &align
);
777 offset
= (data_section
->data_offset
+ align
- 1) & -align
;
778 data_section
->data_offset
= offset
;
779 /* XXX: not portable yet */
780 #if defined(__i386__) || defined(__x86_64__)
781 /* Zero pad x87 tenbyte long doubles */
782 if (size
== LDOUBLE_SIZE
) {
783 vtop
->c
.tab
[2] &= 0xffff;
784 #if LDOUBLE_SIZE == 16
789 ptr
= section_ptr_add(data_section
, size
);
791 #if defined(TCC_TARGET_ARM) && !defined(TCC_ARM_VFP)
795 ptr
[i
] = vtop
->c
.tab
[size
-1-i
];
799 ptr
[i
] = vtop
->c
.tab
[i
];
800 sym
= get_sym_ref(&vtop
->type
, data_section
, offset
, size
<< 2);
801 vtop
->r
|= VT_LVAL
| VT_SYM
;
803 vtop
->c
.ptr_offset
= 0;
805 #ifdef CONFIG_TCC_BCHECK
806 if (vtop
->r
& VT_MUSTBOUND
)
810 r
= vtop
->r
& VT_VALMASK
;
811 rc2
= (rc
& RC_FLOAT
) ? RC_FLOAT
: RC_INT
;
812 #ifndef TCC_TARGET_ARM64
815 #ifdef TCC_TARGET_X86_64
816 else if (rc
== RC_FRET
)
821 /* need to reload if:
823 - lvalue (need to dereference pointer)
824 - already a register, but not in the right class */
826 || (vtop
->r
& VT_LVAL
)
827 || !(reg_classes
[r
] & rc
)
828 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
829 || ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
&& !(reg_classes
[vtop
->r2
] & rc2
))
830 || ((vtop
->type
.t
& VT_BTYPE
) == VT_QFLOAT
&& !(reg_classes
[vtop
->r2
] & rc2
))
832 || ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
&& !(reg_classes
[vtop
->r2
] & rc2
))
837 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
838 if (((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) || ((vtop
->type
.t
& VT_BTYPE
) == VT_QFLOAT
)) {
839 int addr_type
= VT_LLONG
, load_size
= 8, load_type
= ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) ? VT_LLONG
: VT_DOUBLE
;
841 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
842 int addr_type
= VT_INT
, load_size
= 4, load_type
= VT_INT
;
843 unsigned long long ll
;
845 int r2
, original_type
;
846 original_type
= vtop
->type
.t
;
847 /* two register type load : expand to two words
849 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
850 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
853 vtop
->c
.ui
= ll
; /* first word */
855 vtop
->r
= r
; /* save register value */
856 vpushi(ll
>> 32); /* second word */
859 if (r
>= VT_CONST
|| /* XXX: test to VT_CONST incorrect ? */
860 (vtop
->r
& VT_LVAL
)) {
861 /* We do not want to modifier the long long
862 pointer here, so the safest (and less
863 efficient) is to save all the other registers
864 in the stack. XXX: totally inefficient. */
866 /* load from memory */
867 vtop
->type
.t
= load_type
;
870 vtop
[-1].r
= r
; /* save register value */
871 /* increment pointer to get second word */
872 vtop
->type
.t
= addr_type
;
877 vtop
->type
.t
= load_type
;
882 vtop
[-1].r
= r
; /* save register value */
883 vtop
->r
= vtop
[-1].r2
;
885 /* Allocate second register. Here we rely on the fact that
886 get_reg() tries first to free r2 of an SValue. */
890 /* write second register */
892 vtop
->type
.t
= original_type
;
893 } else if ((vtop
->r
& VT_LVAL
) && !is_float(vtop
->type
.t
)) {
895 /* lvalue of scalar type : need to use lvalue type
896 because of possible cast */
899 /* compute memory access type */
900 if (vtop
->r
& VT_REF
)
901 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
906 else if (vtop
->r
& VT_LVAL_BYTE
)
908 else if (vtop
->r
& VT_LVAL_SHORT
)
910 if (vtop
->r
& VT_LVAL_UNSIGNED
)
914 /* restore wanted type */
917 /* one register type load */
922 #ifdef TCC_TARGET_C67
923 /* uses register pairs for doubles */
924 if ((vtop
->type
.t
& VT_BTYPE
) == VT_DOUBLE
)
931 /* generate vtop[-1] and vtop[0] in resp. classes rc1 and rc2 */
932 ST_FUNC
void gv2(int rc1
, int rc2
)
936 /* generate more generic register first. But VT_JMP or VT_CMP
937 values must be generated first in all cases to avoid possible
939 v
= vtop
[0].r
& VT_VALMASK
;
940 if (v
!= VT_CMP
&& (v
& ~1) != VT_JMP
&& rc1
<= rc2
) {
945 /* test if reload is needed for first register */
946 if ((vtop
[-1].r
& VT_VALMASK
) >= VT_CONST
) {
956 /* test if reload is needed for first register */
957 if ((vtop
[0].r
& VT_VALMASK
) >= VT_CONST
) {
963 #ifndef TCC_TARGET_ARM64
964 /* wrapper around RC_FRET to return a register by type */
965 static int rc_fret(int t
)
967 #ifdef TCC_TARGET_X86_64
968 if (t
== VT_LDOUBLE
) {
976 /* wrapper around REG_FRET to return a register by type */
977 static int reg_fret(int t
)
979 #ifdef TCC_TARGET_X86_64
980 if (t
== VT_LDOUBLE
) {
987 /* expand long long on stack in two int registers */
988 static void lexpand(void)
992 u
= vtop
->type
.t
& (VT_DEFSIGN
| VT_UNSIGNED
);
995 vtop
[0].r
= vtop
[-1].r2
;
996 vtop
[0].r2
= VT_CONST
;
997 vtop
[-1].r2
= VT_CONST
;
998 vtop
[0].type
.t
= VT_INT
| u
;
999 vtop
[-1].type
.t
= VT_INT
| u
;
1002 #ifdef TCC_TARGET_ARM
1003 /* expand long long on stack */
1004 ST_FUNC
void lexpand_nr(void)
1008 u
= vtop
->type
.t
& (VT_DEFSIGN
| VT_UNSIGNED
);
1010 vtop
->r2
= VT_CONST
;
1011 vtop
->type
.t
= VT_INT
| u
;
1012 v
=vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
);
1013 if (v
== VT_CONST
) {
1014 vtop
[-1].c
.ui
= vtop
->c
.ull
;
1015 vtop
->c
.ui
= vtop
->c
.ull
>> 32;
1017 } else if (v
== (VT_LVAL
|VT_CONST
) || v
== (VT_LVAL
|VT_LOCAL
)) {
1019 vtop
->r
= vtop
[-1].r
;
1020 } else if (v
> VT_CONST
) {
1024 vtop
->r
= vtop
[-1].r2
;
1025 vtop
[-1].r2
= VT_CONST
;
1026 vtop
[-1].type
.t
= VT_INT
| u
;
1030 /* build a long long from two ints */
1031 static void lbuild(int t
)
1033 gv2(RC_INT
, RC_INT
);
1034 vtop
[-1].r2
= vtop
[0].r
;
1035 vtop
[-1].type
.t
= t
;
1039 /* rotate n first stack elements to the bottom
1040 I1 ... In -> I2 ... In I1 [top is right]
1042 ST_FUNC
void vrotb(int n
)
1048 for(i
=-n
+1;i
!=0;i
++)
1049 vtop
[i
] = vtop
[i
+1];
1053 /* rotate the n elements before entry e towards the top
1054 I1 ... In ... -> In I1 ... I(n-1) ... [top is right]
1056 ST_FUNC
void vrote(SValue
*e
, int n
)
1062 for(i
= 0;i
< n
- 1; i
++)
1067 /* rotate n first stack elements to the top
1068 I1 ... In -> In I1 ... I(n-1) [top is right]
1070 ST_FUNC
void vrott(int n
)
1075 /* pop stack value */
1076 ST_FUNC
void vpop(void)
1079 v
= vtop
->r
& VT_VALMASK
;
1080 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
1081 /* for x86, we need to pop the FP stack */
1082 if (v
== TREG_ST0
&& !nocode_wanted
) {
1083 o(0xd8dd); /* fstp %st(0) */
1086 if (v
== VT_JMP
|| v
== VT_JMPI
) {
1087 /* need to put correct jump if && or || without test */
1093 /* convert stack entry to register and duplicate its value in another
1095 static void gv_dup(void)
1101 if ((t
& VT_BTYPE
) == VT_LLONG
) {
1108 /* stack: H L L1 H1 */
1116 /* duplicate value */
1121 #ifdef TCC_TARGET_X86_64
1122 if ((t
& VT_BTYPE
) == VT_LDOUBLE
) {
1132 load(r1
, &sv
); /* move r to r1 */
1134 /* duplicates value */
1140 /* Generate value test
1142 * Generate a test for any value (jump, comparison and integers) */
1143 ST_FUNC
int gvtst(int inv
, int t
)
1145 int v
= vtop
->r
& VT_VALMASK
;
1146 if (v
!= VT_CMP
&& v
!= VT_JMP
&& v
!= VT_JMPI
) {
1150 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
1151 /* constant jmp optimization */
1152 if ((vtop
->c
.i
!= 0) != inv
)
1157 return gtst(inv
, t
);
1160 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
1161 /* generate CPU independent (unsigned) long long operations */
1162 static void gen_opl(int op
)
1164 int t
, a
, b
, op1
, c
, i
;
1166 unsigned short reg_iret
= REG_IRET
;
1167 unsigned short reg_lret
= REG_LRET
;
1173 func
= TOK___divdi3
;
1176 func
= TOK___udivdi3
;
1179 func
= TOK___moddi3
;
1182 func
= TOK___umoddi3
;
1189 /* call generic long long function */
1190 vpush_global_sym(&func_old_type
, func
);
1195 vtop
->r2
= reg_lret
;
1208 /* stack: L1 H1 L2 H2 */
1213 vtop
[-2] = vtop
[-3];
1216 /* stack: H1 H2 L1 L2 */
1222 /* stack: H1 H2 L1 L2 ML MH */
1225 /* stack: ML MH H1 H2 L1 L2 */
1229 /* stack: ML MH H1 L2 H2 L1 */
1234 /* stack: ML MH M1 M2 */
1237 } else if (op
== '+' || op
== '-') {
1238 /* XXX: add non carry method too (for MIPS or alpha) */
1244 /* stack: H1 H2 (L1 op L2) */
1247 gen_op(op1
+ 1); /* TOK_xxxC2 */
1250 /* stack: H1 H2 (L1 op L2) */
1253 /* stack: (L1 op L2) H1 H2 */
1255 /* stack: (L1 op L2) (H1 op H2) */
1263 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
1264 t
= vtop
[-1].type
.t
;
1268 /* stack: L H shift */
1270 /* constant: simpler */
1271 /* NOTE: all comments are for SHL. the other cases are
1272 done by swaping words */
1283 if (op
!= TOK_SAR
) {
1316 /* XXX: should provide a faster fallback on x86 ? */
1319 func
= TOK___ashrdi3
;
1322 func
= TOK___lshrdi3
;
1325 func
= TOK___ashldi3
;
1331 /* compare operations */
1337 /* stack: L1 H1 L2 H2 */
1339 vtop
[-1] = vtop
[-2];
1341 /* stack: L1 L2 H1 H2 */
1344 /* when values are equal, we need to compare low words. since
1345 the jump is inverted, we invert the test too. */
1348 else if (op1
== TOK_GT
)
1350 else if (op1
== TOK_ULT
)
1352 else if (op1
== TOK_UGT
)
1357 if (op1
!= TOK_NE
) {
1361 /* generate non equal test */
1362 /* XXX: NOT PORTABLE yet */
1366 #if defined(TCC_TARGET_I386)
1367 b
= psym(0x850f, 0);
1368 #elif defined(TCC_TARGET_ARM)
1370 o(0x1A000000 | encbranch(ind
, 0, 1));
1371 #elif defined(TCC_TARGET_C67) || defined(TCC_TARGET_ARM64)
1372 tcc_error("not implemented");
1374 #error not supported
1378 /* compare low. Always unsigned */
1382 else if (op1
== TOK_LE
)
1384 else if (op1
== TOK_GT
)
1386 else if (op1
== TOK_GE
)
1397 /* handle integer constant optimizations and various machine
1399 static void gen_opic(int op
)
1401 int c1
, c2
, t1
, t2
, n
;
1404 typedef unsigned long long U
;
1408 t1
= v1
->type
.t
& VT_BTYPE
;
1409 t2
= v2
->type
.t
& VT_BTYPE
;
1413 else if (v1
->type
.t
& VT_UNSIGNED
)
1420 else if (v2
->type
.t
& VT_UNSIGNED
)
1425 /* currently, we cannot do computations with forward symbols */
1426 c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1427 c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1430 case '+': l1
+= l2
; break;
1431 case '-': l1
-= l2
; break;
1432 case '&': l1
&= l2
; break;
1433 case '^': l1
^= l2
; break;
1434 case '|': l1
|= l2
; break;
1435 case '*': l1
*= l2
; break;
1442 /* if division by zero, generate explicit division */
1445 tcc_error("division by zero in constant");
1449 default: l1
/= l2
; break;
1450 case '%': l1
%= l2
; break;
1451 case TOK_UDIV
: l1
= (U
)l1
/ l2
; break;
1452 case TOK_UMOD
: l1
= (U
)l1
% l2
; break;
1455 case TOK_SHL
: l1
<<= l2
; break;
1456 case TOK_SHR
: l1
= (U
)l1
>> l2
; break;
1457 case TOK_SAR
: l1
>>= l2
; break;
1459 case TOK_ULT
: l1
= (U
)l1
< (U
)l2
; break;
1460 case TOK_UGE
: l1
= (U
)l1
>= (U
)l2
; break;
1461 case TOK_EQ
: l1
= l1
== l2
; break;
1462 case TOK_NE
: l1
= l1
!= l2
; break;
1463 case TOK_ULE
: l1
= (U
)l1
<= (U
)l2
; break;
1464 case TOK_UGT
: l1
= (U
)l1
> (U
)l2
; break;
1465 case TOK_LT
: l1
= l1
< l2
; break;
1466 case TOK_GE
: l1
= l1
>= l2
; break;
1467 case TOK_LE
: l1
= l1
<= l2
; break;
1468 case TOK_GT
: l1
= l1
> l2
; break;
1470 case TOK_LAND
: l1
= l1
&& l2
; break;
1471 case TOK_LOR
: l1
= l1
|| l2
; break;
1478 /* if commutative ops, put c2 as constant */
1479 if (c1
&& (op
== '+' || op
== '&' || op
== '^' ||
1480 op
== '|' || op
== '*')) {
1482 c2
= c1
; //c = c1, c1 = c2, c2 = c;
1483 l2
= l1
; //l = l1, l1 = l2, l2 = l;
1485 if (!const_wanted
&&
1487 (op
== TOK_SHL
|| op
== TOK_SHR
|| op
== TOK_SAR
)) ||
1488 (l1
== -1 && op
== TOK_SAR
))) {
1489 /* treat (0 << x), (0 >> x) and (-1 >> x) as constant */
1491 } else if (!const_wanted
&&
1492 c2
&& ((l2
== 0 && (op
== '&' || op
== '*')) ||
1493 (l2
== -1 && op
== '|') ||
1494 (l2
== 0xffffffff && t2
!= VT_LLONG
&& op
== '|') ||
1495 (l2
== 1 && (op
== '%' || op
== TOK_UMOD
)))) {
1496 /* treat (x & 0), (x * 0), (x | -1) and (x % 1) as constant */
1501 } else if (c2
&& (((op
== '*' || op
== '/' || op
== TOK_UDIV
||
1504 ((op
== '+' || op
== '-' || op
== '|' || op
== '^' ||
1505 op
== TOK_SHL
|| op
== TOK_SHR
|| op
== TOK_SAR
) &&
1509 /* filter out NOP operations like x*1, x-0, x&-1... */
1511 } else if (c2
&& (op
== '*' || op
== TOK_PDIV
|| op
== TOK_UDIV
)) {
1512 /* try to use shifts instead of muls or divs */
1513 if (l2
> 0 && (l2
& (l2
- 1)) == 0) {
1522 else if (op
== TOK_PDIV
)
1528 } else if (c2
&& (op
== '+' || op
== '-') &&
1529 (((vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
))
1530 || (vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
)) == VT_LOCAL
)) {
1531 /* symbol + constant case */
1538 if (!nocode_wanted
) {
1539 /* call low level op generator */
1540 if (t1
== VT_LLONG
|| t2
== VT_LLONG
||
1541 (PTR_SIZE
== 8 && (t1
== VT_PTR
|| t2
== VT_PTR
)))
1552 /* generate a floating point operation with constant propagation */
1553 static void gen_opif(int op
)
1561 /* currently, we cannot do computations with forward symbols */
1562 c1
= (v1
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1563 c2
= (v2
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1565 if (v1
->type
.t
== VT_FLOAT
) {
1568 } else if (v1
->type
.t
== VT_DOUBLE
) {
1576 /* NOTE: we only do constant propagation if finite number (not
1577 NaN or infinity) (ANSI spec) */
1578 if (!ieee_finite(f1
) || !ieee_finite(f2
))
1582 case '+': f1
+= f2
; break;
1583 case '-': f1
-= f2
; break;
1584 case '*': f1
*= f2
; break;
1588 tcc_error("division by zero in constant");
1593 /* XXX: also handles tests ? */
1597 /* XXX: overflow test ? */
1598 if (v1
->type
.t
== VT_FLOAT
) {
1600 } else if (v1
->type
.t
== VT_DOUBLE
) {
1608 if (!nocode_wanted
) {
1616 static int pointed_size(CType
*type
)
1619 return type_size(pointed_type(type
), &align
);
1622 static void vla_runtime_pointed_size(CType
*type
)
1625 vla_runtime_type_size(pointed_type(type
), &align
);
1628 static inline int is_null_pointer(SValue
*p
)
1630 if ((p
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
1632 return ((p
->type
.t
& VT_BTYPE
) == VT_INT
&& p
->c
.i
== 0) ||
1633 ((p
->type
.t
& VT_BTYPE
) == VT_LLONG
&& p
->c
.ll
== 0) ||
1634 ((p
->type
.t
& VT_BTYPE
) == VT_PTR
&& p
->c
.ptr_offset
== 0);
1637 static inline int is_integer_btype(int bt
)
1639 return (bt
== VT_BYTE
|| bt
== VT_SHORT
||
1640 bt
== VT_INT
|| bt
== VT_LLONG
);
1643 /* check types for comparison or subtraction of pointers */
1644 static void check_comparison_pointer_types(SValue
*p1
, SValue
*p2
, int op
)
1646 CType
*type1
, *type2
, tmp_type1
, tmp_type2
;
1649 /* null pointers are accepted for all comparisons as gcc */
1650 if (is_null_pointer(p1
) || is_null_pointer(p2
))
1654 bt1
= type1
->t
& VT_BTYPE
;
1655 bt2
= type2
->t
& VT_BTYPE
;
1656 /* accept comparison between pointer and integer with a warning */
1657 if ((is_integer_btype(bt1
) || is_integer_btype(bt2
)) && op
!= '-') {
1658 if (op
!= TOK_LOR
&& op
!= TOK_LAND
)
1659 tcc_warning("comparison between pointer and integer");
1663 /* both must be pointers or implicit function pointers */
1664 if (bt1
== VT_PTR
) {
1665 type1
= pointed_type(type1
);
1666 } else if (bt1
!= VT_FUNC
)
1667 goto invalid_operands
;
1669 if (bt2
== VT_PTR
) {
1670 type2
= pointed_type(type2
);
1671 } else if (bt2
!= VT_FUNC
) {
1673 tcc_error("invalid operands to binary %s", get_tok_str(op
, NULL
));
1675 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
1676 (type2
->t
& VT_BTYPE
) == VT_VOID
)
1680 tmp_type1
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1681 tmp_type2
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
| VT_VOLATILE
);
1682 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
1683 /* gcc-like error if '-' is used */
1685 goto invalid_operands
;
1687 tcc_warning("comparison of distinct pointer types lacks a cast");
1691 /* generic gen_op: handles types problems */
1692 ST_FUNC
void gen_op(int op
)
1694 int u
, t1
, t2
, bt1
, bt2
, t
;
1697 t1
= vtop
[-1].type
.t
;
1698 t2
= vtop
[0].type
.t
;
1699 bt1
= t1
& VT_BTYPE
;
1700 bt2
= t2
& VT_BTYPE
;
1702 if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
1703 /* at least one operand is a pointer */
1704 /* relationnal op: must be both pointers */
1705 if (op
>= TOK_ULT
&& op
<= TOK_LOR
) {
1706 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1707 /* pointers are handled are unsigned */
1708 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1709 t
= VT_LLONG
| VT_UNSIGNED
;
1711 t
= VT_INT
| VT_UNSIGNED
;
1715 /* if both pointers, then it must be the '-' op */
1716 if (bt1
== VT_PTR
&& bt2
== VT_PTR
) {
1718 tcc_error("cannot use pointers here");
1719 check_comparison_pointer_types(vtop
- 1, vtop
, op
);
1720 /* XXX: check that types are compatible */
1721 if (vtop
[-1].type
.t
& VT_VLA
) {
1722 vla_runtime_pointed_size(&vtop
[-1].type
);
1724 vpushi(pointed_size(&vtop
[-1].type
));
1728 /* set to integer type */
1729 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1730 vtop
->type
.t
= VT_LLONG
;
1732 vtop
->type
.t
= VT_INT
;
1737 /* exactly one pointer : must be '+' or '-'. */
1738 if (op
!= '-' && op
!= '+')
1739 tcc_error("cannot use pointers here");
1740 /* Put pointer as first operand */
1741 if (bt2
== VT_PTR
) {
1745 type1
= vtop
[-1].type
;
1746 type1
.t
&= ~VT_ARRAY
;
1747 if (vtop
[-1].type
.t
& VT_VLA
)
1748 vla_runtime_pointed_size(&vtop
[-1].type
);
1750 u
= pointed_size(&vtop
[-1].type
);
1752 tcc_error("unknown array element size");
1753 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
1756 /* XXX: cast to int ? (long long case) */
1762 /* #ifdef CONFIG_TCC_BCHECK
1763 The main reason to removing this code:
1770 fprintf(stderr, "v+i-j = %p\n", v+i-j);
1771 fprintf(stderr, "v+(i-j) = %p\n", v+(i-j));
1773 When this code is on. then the output looks like
1775 v+(i-j) = 0xbff84000
1777 /* if evaluating constant expression, no code should be
1778 generated, so no bound check */
1779 if (tcc_state
->do_bounds_check
&& !const_wanted
) {
1780 /* if bounded pointers, we generate a special code to
1787 gen_bounded_ptr_add();
1793 /* put again type if gen_opic() swaped operands */
1796 } else if (is_float(bt1
) || is_float(bt2
)) {
1797 /* compute bigger type and do implicit casts */
1798 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
1800 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
1805 /* floats can only be used for a few operations */
1806 if (op
!= '+' && op
!= '-' && op
!= '*' && op
!= '/' &&
1807 (op
< TOK_ULT
|| op
> TOK_GT
))
1808 tcc_error("invalid operands for binary operation");
1810 } else if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
) {
1811 t
= bt1
== VT_LLONG
? VT_LLONG
: VT_INT
;
1812 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (t
| VT_UNSIGNED
))
1815 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
1816 /* cast to biggest op */
1818 /* convert to unsigned if it does not fit in a long long */
1819 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
1820 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
1823 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
1824 tcc_error("comparison of struct");
1826 /* integer operations */
1828 /* convert to unsigned if it does not fit in an integer */
1829 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
1830 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
1833 /* XXX: currently, some unsigned operations are explicit, so
1834 we modify them here */
1835 if (t
& VT_UNSIGNED
) {
1842 else if (op
== TOK_LT
)
1844 else if (op
== TOK_GT
)
1846 else if (op
== TOK_LE
)
1848 else if (op
== TOK_GE
)
1855 /* special case for shifts and long long: we keep the shift as
1857 if (op
== TOK_SHR
|| op
== TOK_SAR
|| op
== TOK_SHL
)
1864 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
1865 /* relationnal op: the result is an int */
1866 vtop
->type
.t
= VT_INT
;
1871 // Make sure that we have converted to an rvalue:
1872 if (vtop
->r
& VT_LVAL
&& !nocode_wanted
)
1873 gv(is_float(vtop
->type
.t
& VT_BTYPE
) ? RC_FLOAT
: RC_INT
);
1876 #ifndef TCC_TARGET_ARM
1877 /* generic itof for unsigned long long case */
1878 static void gen_cvt_itof1(int t
)
1880 #ifdef TCC_TARGET_ARM64
1883 if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
1884 (VT_LLONG
| VT_UNSIGNED
)) {
1887 vpush_global_sym(&func_old_type
, TOK___floatundisf
);
1888 #if LDOUBLE_SIZE != 8
1889 else if (t
== VT_LDOUBLE
)
1890 vpush_global_sym(&func_old_type
, TOK___floatundixf
);
1893 vpush_global_sym(&func_old_type
, TOK___floatundidf
);
1897 vtop
->r
= reg_fret(t
);
1905 /* generic ftoi for unsigned long long case */
1906 static void gen_cvt_ftoi1(int t
)
1908 #ifdef TCC_TARGET_ARM64
1913 if (t
== (VT_LLONG
| VT_UNSIGNED
)) {
1914 /* not handled natively */
1915 st
= vtop
->type
.t
& VT_BTYPE
;
1917 vpush_global_sym(&func_old_type
, TOK___fixunssfdi
);
1918 #if LDOUBLE_SIZE != 8
1919 else if (st
== VT_LDOUBLE
)
1920 vpush_global_sym(&func_old_type
, TOK___fixunsxfdi
);
1923 vpush_global_sym(&func_old_type
, TOK___fixunsdfdi
);
1928 vtop
->r2
= REG_LRET
;
1935 /* force char or short cast */
1936 static void force_charshort_cast(int t
)
1940 /* XXX: add optimization if lvalue : just change type and offset */
1945 if (t
& VT_UNSIGNED
) {
1946 vpushi((1 << bits
) - 1);
1952 /* result must be signed or the SAR is converted to an SHL
1953 This was not the case when "t" was a signed short
1954 and the last value on the stack was an unsigned int */
1955 vtop
->type
.t
&= ~VT_UNSIGNED
;
1961 /* cast 'vtop' to 'type'. Casting to bitfields is forbidden. */
1962 static void gen_cast(CType
*type
)
1964 int sbt
, dbt
, sf
, df
, c
, p
;
1966 /* special delayed cast for char/short */
1967 /* XXX: in some cases (multiple cascaded casts), it may still
1969 if (vtop
->r
& VT_MUSTCAST
) {
1970 vtop
->r
&= ~VT_MUSTCAST
;
1971 force_charshort_cast(vtop
->type
.t
);
1974 /* bitfields first get cast to ints */
1975 if (vtop
->type
.t
& VT_BITFIELD
&& !nocode_wanted
) {
1979 dbt
= type
->t
& (VT_BTYPE
| VT_UNSIGNED
);
1980 sbt
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
1985 c
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
1986 p
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == (VT_CONST
| VT_SYM
);
1988 /* constant case: we can do it now */
1989 /* XXX: in ISOC, cannot do it if error in convert */
1990 if (sbt
== VT_FLOAT
)
1991 vtop
->c
.ld
= vtop
->c
.f
;
1992 else if (sbt
== VT_DOUBLE
)
1993 vtop
->c
.ld
= vtop
->c
.d
;
1996 if ((sbt
& VT_BTYPE
) == VT_LLONG
) {
1997 if (sbt
& VT_UNSIGNED
)
1998 vtop
->c
.ld
= vtop
->c
.ull
;
2000 vtop
->c
.ld
= vtop
->c
.ll
;
2002 if (sbt
& VT_UNSIGNED
)
2003 vtop
->c
.ld
= vtop
->c
.ui
;
2005 vtop
->c
.ld
= vtop
->c
.i
;
2008 if (dbt
== VT_FLOAT
)
2009 vtop
->c
.f
= (float)vtop
->c
.ld
;
2010 else if (dbt
== VT_DOUBLE
)
2011 vtop
->c
.d
= (double)vtop
->c
.ld
;
2012 } else if (sf
&& dbt
== (VT_LLONG
|VT_UNSIGNED
)) {
2013 vtop
->c
.ull
= (unsigned long long)vtop
->c
.ld
;
2014 } else if (sf
&& dbt
== VT_BOOL
) {
2015 vtop
->c
.i
= (vtop
->c
.ld
!= 0);
2018 vtop
->c
.ll
= (long long)vtop
->c
.ld
;
2019 else if (sbt
== (VT_LLONG
|VT_UNSIGNED
))
2020 vtop
->c
.ll
= vtop
->c
.ull
;
2021 else if (sbt
& VT_UNSIGNED
)
2022 vtop
->c
.ll
= vtop
->c
.ui
;
2023 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2024 else if (sbt
== VT_PTR
)
2027 else if (sbt
!= VT_LLONG
)
2028 vtop
->c
.ll
= vtop
->c
.i
;
2030 if (dbt
== (VT_LLONG
|VT_UNSIGNED
))
2031 vtop
->c
.ull
= vtop
->c
.ll
;
2032 else if (dbt
== VT_BOOL
)
2033 vtop
->c
.i
= (vtop
->c
.ll
!= 0);
2034 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2035 else if (dbt
== VT_PTR
)
2038 else if (dbt
!= VT_LLONG
) {
2040 if ((dbt
& VT_BTYPE
) == VT_BYTE
)
2042 else if ((dbt
& VT_BTYPE
) == VT_SHORT
)
2044 if(dbt
& VT_UNSIGNED
)
2045 vtop
->c
.ui
= ((unsigned int)vtop
->c
.ll
<< s
) >> s
;
2047 vtop
->c
.i
= ((int)vtop
->c
.ll
<< s
) >> s
;
2050 } else if (p
&& dbt
== VT_BOOL
) {
2053 } else if (!nocode_wanted
) {
2054 /* non constant case: generate code */
2056 /* convert from fp to fp */
2059 /* convert int to fp */
2062 /* convert fp to int */
2063 if (dbt
== VT_BOOL
) {
2067 /* we handle char/short/etc... with generic code */
2068 if (dbt
!= (VT_INT
| VT_UNSIGNED
) &&
2069 dbt
!= (VT_LLONG
| VT_UNSIGNED
) &&
2073 if (dbt
== VT_INT
&& (type
->t
& (VT_BTYPE
| VT_UNSIGNED
)) != dbt
) {
2074 /* additional cast for char/short... */
2079 #if !defined(TCC_TARGET_ARM64) && !defined(TCC_TARGET_X86_64)
2080 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
) {
2081 if ((sbt
& VT_BTYPE
) != VT_LLONG
&& !nocode_wanted
) {
2082 /* scalar to long long */
2083 /* machine independent conversion */
2085 /* generate high word */
2086 if (sbt
== (VT_INT
| VT_UNSIGNED
)) {
2090 if (sbt
== VT_PTR
) {
2091 /* cast from pointer to int before we apply
2092 shift operation, which pointers don't support*/
2093 gen_cast(&int_type
);
2099 /* patch second register */
2100 vtop
[-1].r2
= vtop
->r
;
2104 } else if ((dbt
& VT_BTYPE
) == VT_LLONG
||
2105 (dbt
& VT_BTYPE
) == VT_PTR
||
2106 (dbt
& VT_BTYPE
) == VT_FUNC
) {
2107 if ((sbt
& VT_BTYPE
) != VT_LLONG
&&
2108 (sbt
& VT_BTYPE
) != VT_PTR
&&
2109 (sbt
& VT_BTYPE
) != VT_FUNC
&& !nocode_wanted
) {
2110 /* need to convert from 32bit to 64bit */
2112 if (sbt
!= (VT_INT
| VT_UNSIGNED
)) {
2113 #if defined(TCC_TARGET_ARM64)
2115 #elif defined(TCC_TARGET_X86_64)
2117 /* x86_64 specific: movslq */
2119 o(0xc0 + (REG_VALUE(r
) << 3) + REG_VALUE(r
));
2126 } else if (dbt
== VT_BOOL
) {
2127 /* scalar to bool */
2130 } else if ((dbt
& VT_BTYPE
) == VT_BYTE
||
2131 (dbt
& VT_BTYPE
) == VT_SHORT
) {
2132 if (sbt
== VT_PTR
) {
2133 vtop
->type
.t
= VT_INT
;
2134 tcc_warning("nonportable conversion from pointer to char/short");
2136 force_charshort_cast(dbt
);
2137 } else if ((dbt
& VT_BTYPE
) == VT_INT
) {
2139 if (sbt
== VT_LLONG
&& !nocode_wanted
) {
2140 /* from long long: just take low order word */
2144 /* if lvalue and single word type, nothing to do because
2145 the lvalue already contains the real type size (see
2146 VT_LVAL_xxx constants) */
2149 } else if ((dbt
& VT_BTYPE
) == VT_PTR
&& !(vtop
->r
& VT_LVAL
)) {
2150 /* if we are casting between pointer types,
2151 we must update the VT_LVAL_xxx size */
2152 vtop
->r
= (vtop
->r
& ~VT_LVAL_TYPE
)
2153 | (lvalue_type(type
->ref
->type
.t
) & VT_LVAL_TYPE
);
2158 /* return type size as known at compile time. Put alignment at 'a' */
2159 ST_FUNC
int type_size(CType
*type
, int *a
)
2164 bt
= type
->t
& VT_BTYPE
;
2165 if (bt
== VT_STRUCT
) {
2170 } else if (bt
== VT_PTR
) {
2171 if (type
->t
& VT_ARRAY
) {
2175 ts
= type_size(&s
->type
, a
);
2177 if (ts
< 0 && s
->c
< 0)
2185 } else if (bt
== VT_LDOUBLE
) {
2187 return LDOUBLE_SIZE
;
2188 } else if (bt
== VT_DOUBLE
|| bt
== VT_LLONG
) {
2189 #ifdef TCC_TARGET_I386
2190 #ifdef TCC_TARGET_PE
2195 #elif defined(TCC_TARGET_ARM)
2205 } else if (bt
== VT_INT
|| bt
== VT_ENUM
|| bt
== VT_FLOAT
) {
2208 } else if (bt
== VT_SHORT
) {
2211 } else if (bt
== VT_QLONG
|| bt
== VT_QFLOAT
) {
2215 /* char, void, function, _Bool */
2221 /* push type size as known at runtime time on top of value stack. Put
2223 ST_FUNC
void vla_runtime_type_size(CType
*type
, int *a
)
2225 if (type
->t
& VT_VLA
) {
2226 vset(&int_type
, VT_LOCAL
|VT_LVAL
, type
->ref
->c
);
2228 vpushi(type_size(type
, a
));
2232 static void vla_sp_restore(void) {
2233 if (vlas_in_scope
) {
2234 gen_vla_sp_restore(vla_sp_loc
);
2238 static void vla_sp_restore_root(void) {
2239 if (vlas_in_scope
) {
2240 gen_vla_sp_restore(vla_sp_root_loc
);
2244 /* return the pointed type of t */
2245 static inline CType
*pointed_type(CType
*type
)
2247 return &type
->ref
->type
;
2250 /* modify type so that its it is a pointer to type. */
2251 ST_FUNC
void mk_pointer(CType
*type
)
2254 s
= sym_push(SYM_FIELD
, type
, 0, -1);
2255 type
->t
= VT_PTR
| (type
->t
& ~VT_TYPE
);
2259 /* compare function types. OLD functions match any new functions */
2260 static int is_compatible_func(CType
*type1
, CType
*type2
)
2266 if (!is_compatible_types(&s1
->type
, &s2
->type
))
2268 /* check func_call */
2269 if (s1
->a
.func_call
!= s2
->a
.func_call
)
2271 /* XXX: not complete */
2272 if (s1
->c
== FUNC_OLD
|| s2
->c
== FUNC_OLD
)
2276 while (s1
!= NULL
) {
2279 if (!is_compatible_parameter_types(&s1
->type
, &s2
->type
))
2289 /* return true if type1 and type2 are the same. If unqualified is
2290 true, qualifiers on the types are ignored.
2292 - enums are not checked as gcc __builtin_types_compatible_p ()
2294 static int compare_types(CType
*type1
, CType
*type2
, int unqualified
)
2298 t1
= type1
->t
& VT_TYPE
;
2299 t2
= type2
->t
& VT_TYPE
;
2301 /* strip qualifiers before comparing */
2302 t1
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2303 t2
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2305 /* Default Vs explicit signedness only matters for char */
2306 if ((t1
& VT_BTYPE
) != VT_BYTE
) {
2310 /* XXX: bitfields ? */
2313 /* test more complicated cases */
2314 bt1
= t1
& VT_BTYPE
;
2315 if (bt1
== VT_PTR
) {
2316 type1
= pointed_type(type1
);
2317 type2
= pointed_type(type2
);
2318 return is_compatible_types(type1
, type2
);
2319 } else if (bt1
== VT_STRUCT
) {
2320 return (type1
->ref
== type2
->ref
);
2321 } else if (bt1
== VT_FUNC
) {
2322 return is_compatible_func(type1
, type2
);
2328 /* return true if type1 and type2 are exactly the same (including
2331 static int is_compatible_types(CType
*type1
, CType
*type2
)
2333 return compare_types(type1
,type2
,0);
2336 /* return true if type1 and type2 are the same (ignoring qualifiers).
2338 static int is_compatible_parameter_types(CType
*type1
, CType
*type2
)
2340 return compare_types(type1
,type2
,1);
2343 /* print a type. If 'varstr' is not NULL, then the variable is also
2344 printed in the type */
2346 /* XXX: add array and function pointers */
2347 static void type_to_str(char *buf
, int buf_size
,
2348 CType
*type
, const char *varstr
)
2355 t
= type
->t
& VT_TYPE
;
2358 if (t
& VT_CONSTANT
)
2359 pstrcat(buf
, buf_size
, "const ");
2360 if (t
& VT_VOLATILE
)
2361 pstrcat(buf
, buf_size
, "volatile ");
2362 if ((t
& (VT_DEFSIGN
| VT_UNSIGNED
)) == (VT_DEFSIGN
| VT_UNSIGNED
))
2363 pstrcat(buf
, buf_size
, "unsigned ");
2364 else if (t
& VT_DEFSIGN
)
2365 pstrcat(buf
, buf_size
, "signed ");
2395 tstr
= "long double";
2397 pstrcat(buf
, buf_size
, tstr
);
2401 if (bt
== VT_STRUCT
)
2405 pstrcat(buf
, buf_size
, tstr
);
2406 v
= type
->ref
->v
& ~SYM_STRUCT
;
2407 if (v
>= SYM_FIRST_ANOM
)
2408 pstrcat(buf
, buf_size
, "<anonymous>");
2410 pstrcat(buf
, buf_size
, get_tok_str(v
, NULL
));
2414 type_to_str(buf
, buf_size
, &s
->type
, varstr
);
2415 pstrcat(buf
, buf_size
, "(");
2417 while (sa
!= NULL
) {
2418 type_to_str(buf1
, sizeof(buf1
), &sa
->type
, NULL
);
2419 pstrcat(buf
, buf_size
, buf1
);
2422 pstrcat(buf
, buf_size
, ", ");
2424 pstrcat(buf
, buf_size
, ")");
2428 pstrcpy(buf1
, sizeof(buf1
), "*");
2430 pstrcat(buf1
, sizeof(buf1
), varstr
);
2431 type_to_str(buf
, buf_size
, &s
->type
, buf1
);
2435 pstrcat(buf
, buf_size
, " ");
2436 pstrcat(buf
, buf_size
, varstr
);
2441 /* verify type compatibility to store vtop in 'dt' type, and generate
2443 static void gen_assign_cast(CType
*dt
)
2445 CType
*st
, *type1
, *type2
, tmp_type1
, tmp_type2
;
2446 char buf1
[256], buf2
[256];
2449 st
= &vtop
->type
; /* source type */
2450 dbt
= dt
->t
& VT_BTYPE
;
2451 sbt
= st
->t
& VT_BTYPE
;
2452 if (sbt
== VT_VOID
|| dbt
== VT_VOID
) {
2453 if (sbt
== VT_VOID
&& dbt
== VT_VOID
)
2455 It is Ok if both are void
2461 gcc accepts this program
2464 tcc_error("cannot cast from/to void");
2466 if (dt
->t
& VT_CONSTANT
)
2467 tcc_warning("assignment of read-only location");
2470 /* special cases for pointers */
2471 /* '0' can also be a pointer */
2472 if (is_null_pointer(vtop
))
2474 /* accept implicit pointer to integer cast with warning */
2475 if (is_integer_btype(sbt
)) {
2476 tcc_warning("assignment makes pointer from integer without a cast");
2479 type1
= pointed_type(dt
);
2480 /* a function is implicitely a function pointer */
2481 if (sbt
== VT_FUNC
) {
2482 if ((type1
->t
& VT_BTYPE
) != VT_VOID
&&
2483 !is_compatible_types(pointed_type(dt
), st
))
2484 tcc_warning("assignment from incompatible pointer type");
2489 type2
= pointed_type(st
);
2490 if ((type1
->t
& VT_BTYPE
) == VT_VOID
||
2491 (type2
->t
& VT_BTYPE
) == VT_VOID
) {
2492 /* void * can match anything */
2494 /* exact type match, except for unsigned */
2497 tmp_type1
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
|
2499 tmp_type2
.t
&= ~(VT_DEFSIGN
| VT_UNSIGNED
| VT_CONSTANT
|
2501 if (!is_compatible_types(&tmp_type1
, &tmp_type2
))
2502 tcc_warning("assignment from incompatible pointer type");
2504 /* check const and volatile */
2505 if ((!(type1
->t
& VT_CONSTANT
) && (type2
->t
& VT_CONSTANT
)) ||
2506 (!(type1
->t
& VT_VOLATILE
) && (type2
->t
& VT_VOLATILE
)))
2507 tcc_warning("assignment discards qualifiers from pointer target type");
2513 if (sbt
== VT_PTR
|| sbt
== VT_FUNC
) {
2514 tcc_warning("assignment makes integer from pointer without a cast");
2516 /* XXX: more tests */
2521 tmp_type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2522 tmp_type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
2523 if (!is_compatible_types(&tmp_type1
, &tmp_type2
)) {
2525 type_to_str(buf1
, sizeof(buf1
), st
, NULL
);
2526 type_to_str(buf2
, sizeof(buf2
), dt
, NULL
);
2527 tcc_error("cannot cast '%s' to '%s'", buf1
, buf2
);
2535 /* store vtop in lvalue pushed on stack */
2536 ST_FUNC
void vstore(void)
2538 int sbt
, dbt
, ft
, r
, t
, size
, align
, bit_size
, bit_pos
, rc
, delayed_cast
;
2540 ft
= vtop
[-1].type
.t
;
2541 sbt
= vtop
->type
.t
& VT_BTYPE
;
2542 dbt
= ft
& VT_BTYPE
;
2543 if ((((sbt
== VT_INT
|| sbt
== VT_SHORT
) && dbt
== VT_BYTE
) ||
2544 (sbt
== VT_INT
&& dbt
== VT_SHORT
))
2545 && !(vtop
->type
.t
& VT_BITFIELD
)) {
2546 /* optimize char/short casts */
2547 delayed_cast
= VT_MUSTCAST
;
2548 vtop
->type
.t
= (ft
& VT_TYPE
& ~VT_BITFIELD
&
2549 ((1 << VT_STRUCT_SHIFT
) - 1));
2550 /* XXX: factorize */
2551 if (ft
& VT_CONSTANT
)
2552 tcc_warning("assignment of read-only location");
2555 if (!(ft
& VT_BITFIELD
))
2556 gen_assign_cast(&vtop
[-1].type
);
2559 if (sbt
== VT_STRUCT
) {
2560 /* if structure, only generate pointer */
2561 /* structure assignment : generate memcpy */
2562 /* XXX: optimize if small size */
2563 if (!nocode_wanted
) {
2564 size
= type_size(&vtop
->type
, &align
);
2568 vtop
->type
.t
= VT_PTR
;
2571 /* address of memcpy() */
2574 vpush_global_sym(&func_old_type
, TOK_memcpy8
);
2575 else if(!(align
& 3))
2576 vpush_global_sym(&func_old_type
, TOK_memcpy4
);
2579 vpush_global_sym(&func_old_type
, TOK_memcpy
);
2584 vtop
->type
.t
= VT_PTR
;
2593 /* leave source on stack */
2594 } else if (ft
& VT_BITFIELD
) {
2595 /* bitfield store handling */
2597 /* save lvalue as expression result (example: s.b = s.a = n;) */
2598 vdup(), vtop
[-1] = vtop
[-2];
2600 bit_pos
= (ft
>> VT_STRUCT_SHIFT
) & 0x3f;
2601 bit_size
= (ft
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
2602 /* remove bit field info to avoid loops */
2603 vtop
[-1].type
.t
= ft
& ~VT_BITFIELD
& ((1 << VT_STRUCT_SHIFT
) - 1);
2605 if((ft
& VT_BTYPE
) == VT_BOOL
) {
2606 gen_cast(&vtop
[-1].type
);
2607 vtop
[-1].type
.t
= (vtop
[-1].type
.t
& ~VT_BTYPE
) | (VT_BYTE
| VT_UNSIGNED
);
2610 /* duplicate destination */
2612 vtop
[-1] = vtop
[-2];
2614 /* mask and shift source */
2615 if((ft
& VT_BTYPE
) != VT_BOOL
) {
2616 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2617 vpushll((1ULL << bit_size
) - 1ULL);
2619 vpushi((1 << bit_size
) - 1);
2625 /* load destination, mask and or with source */
2627 if((ft
& VT_BTYPE
) == VT_LLONG
) {
2628 vpushll(~(((1ULL << bit_size
) - 1ULL) << bit_pos
));
2630 vpushi(~(((1 << bit_size
) - 1) << bit_pos
));
2636 /* ... and discard */
2640 if (!nocode_wanted
) {
2641 #ifdef CONFIG_TCC_BCHECK
2642 /* bound check case */
2643 if (vtop
[-1].r
& VT_MUSTBOUND
) {
2652 #ifdef TCC_TARGET_X86_64
2653 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
2655 } else if ((ft
& VT_BTYPE
) == VT_QFLOAT
) {
2660 r
= gv(rc
); /* generate value */
2661 /* if lvalue was saved on stack, must read it */
2662 if ((vtop
[-1].r
& VT_VALMASK
) == VT_LLOCAL
) {
2664 t
= get_reg(RC_INT
);
2665 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2670 sv
.r
= VT_LOCAL
| VT_LVAL
;
2671 sv
.c
.ul
= vtop
[-1].c
.ul
;
2673 vtop
[-1].r
= t
| VT_LVAL
;
2675 /* two word case handling : store second register at word + 4 (or +8 for x86-64) */
2676 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
2677 if (((ft
& VT_BTYPE
) == VT_QLONG
) || ((ft
& VT_BTYPE
) == VT_QFLOAT
)) {
2678 int addr_type
= VT_LLONG
, load_size
= 8, load_type
= ((vtop
->type
.t
& VT_BTYPE
) == VT_QLONG
) ? VT_LLONG
: VT_DOUBLE
;
2680 if ((ft
& VT_BTYPE
) == VT_LLONG
) {
2681 int addr_type
= VT_INT
, load_size
= 4, load_type
= VT_INT
;
2683 vtop
[-1].type
.t
= load_type
;
2686 /* convert to int to increment easily */
2687 vtop
->type
.t
= addr_type
;
2693 vtop
[-1].type
.t
= load_type
;
2694 /* XXX: it works because r2 is spilled last ! */
2695 store(vtop
->r2
, vtop
- 1);
2701 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
2702 vtop
->r
|= delayed_cast
;
2706 /* post defines POST/PRE add. c is the token ++ or -- */
2707 ST_FUNC
void inc(int post
, int c
)
2710 vdup(); /* save lvalue */
2713 gv_dup(); /* duplicate value */
2715 vdup(); /* duplicate value */
2720 vpushi(c
- TOK_MID
);
2722 vstore(); /* store value */
2724 vpop(); /* if post op, return saved value */
2727 /* Parse GNUC __attribute__ extension. Currently, the following
2728 extensions are recognized:
2729 - aligned(n) : set data/function alignment.
2730 - packed : force data alignment to 1
2731 - section(x) : generate data/code in this section.
2732 - unused : currently ignored, but may be used someday.
2733 - regparm(n) : pass function parameters in registers (i386 only)
2735 static void parse_attribute(AttributeDef
*ad
)
2739 while (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
) {
2743 while (tok
!= ')') {
2744 if (tok
< TOK_IDENT
)
2745 expect("attribute name");
2753 expect("section name");
2754 ad
->section
= find_section(tcc_state
, (char *)tokc
.cstr
->data
);
2762 expect("alias(\"target\")");
2763 ad
->alias_target
= /* save string as token, for later */
2764 tok_alloc((char*)tokc
.cstr
->data
, tokc
.cstr
->size
-1)->tok
;
2768 case TOK_VISIBILITY1
:
2769 case TOK_VISIBILITY2
:
2772 expect("visibility(\"default|hidden|internal|protected\")");
2773 if (!strcmp (tokc
.cstr
->data
, "default"))
2774 ad
->a
.visibility
= STV_DEFAULT
;
2775 else if (!strcmp (tokc
.cstr
->data
, "hidden"))
2776 ad
->a
.visibility
= STV_HIDDEN
;
2777 else if (!strcmp (tokc
.cstr
->data
, "internal"))
2778 ad
->a
.visibility
= STV_INTERNAL
;
2779 else if (!strcmp (tokc
.cstr
->data
, "protected"))
2780 ad
->a
.visibility
= STV_PROTECTED
;
2782 expect("visibility(\"default|hidden|internal|protected\")");
2791 if (n
<= 0 || (n
& (n
- 1)) != 0)
2792 tcc_error("alignment must be a positive power of two");
2809 /* currently, no need to handle it because tcc does not
2810 track unused objects */
2814 /* currently, no need to handle it because tcc does not
2815 track unused objects */
2820 ad
->a
.func_call
= FUNC_CDECL
;
2825 ad
->a
.func_call
= FUNC_STDCALL
;
2827 #ifdef TCC_TARGET_I386
2837 ad
->a
.func_call
= FUNC_FASTCALL1
+ n
- 1;
2843 ad
->a
.func_call
= FUNC_FASTCALLW
;
2850 ad
->a
.mode
= VT_LLONG
+ 1;
2853 ad
->a
.mode
= VT_SHORT
+ 1;
2856 ad
->a
.mode
= VT_INT
+ 1;
2859 tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok
, NULL
));
2866 ad
->a
.func_export
= 1;
2869 ad
->a
.func_import
= 1;
2872 if (tcc_state
->warn_unsupported
)
2873 tcc_warning("'%s' attribute ignored", get_tok_str(t
, NULL
));
2874 /* skip parameters */
2876 int parenthesis
= 0;
2880 else if (tok
== ')')
2883 } while (parenthesis
&& tok
!= -1);
2896 /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
2897 static void struct_decl(CType
*type
, int u
, int tdef
)
2899 int a
, v
, size
, align
, maxalign
, c
, offset
, flexible
;
2900 int bit_size
, bit_pos
, bsize
, bt
, lbit_pos
, prevbt
;
2901 Sym
*s
, *ss
, *ass
, **ps
;
2905 a
= tok
; /* save decl type */
2910 /* struct already defined ? return it */
2912 expect("struct/union/enum name");
2916 tcc_error("invalid type");
2918 } else if (tok
>= TOK_IDENT
&& !tdef
)
2919 tcc_error("unknown struct/union/enum");
2925 /* we put an undefined size for struct/union */
2926 s
= sym_push(v
| SYM_STRUCT
, &type1
, 0, -1);
2927 s
->r
= 0; /* default alignment is zero as gcc */
2928 /* put struct/union/enum name in type */
2936 tcc_error("struct/union/enum already defined");
2937 /* cannot be empty */
2939 /* non empty enums are not allowed */
2940 if (a
== TOK_ENUM
) {
2944 expect("identifier");
2946 if (ss
&& !local_stack
)
2947 tcc_error("redefinition of enumerator '%s'",
2948 get_tok_str(v
, NULL
));
2954 /* enum symbols have static storage */
2955 ss
= sym_push(v
, &int_type
, VT_CONST
, c
);
2956 ss
->type
.t
|= VT_STATIC
;
2961 /* NOTE: we accept a trailing comma */
2965 s
->c
= type_size(&int_type
, &align
);
2974 while (tok
!= '}') {
2975 parse_btype(&btype
, &ad
);
2978 tcc_error("flexible array member '%s' not at the end of struct",
2979 get_tok_str(v
, NULL
));
2984 type_decl(&type1
, &ad
, &v
, TYPE_DIRECT
| TYPE_ABSTRACT
);
2986 if ((type1
.t
& VT_BTYPE
) != VT_STRUCT
)
2987 expect("identifier");
2989 int v
= btype
.ref
->v
;
2990 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) < SYM_FIRST_ANOM
) {
2991 if (tcc_state
->ms_extensions
== 0)
2992 expect("identifier");
2996 if (type_size(&type1
, &align
) < 0) {
2997 if ((a
== TOK_STRUCT
) && (type1
.t
& VT_ARRAY
) && c
)
3000 tcc_error("field '%s' has incomplete type",
3001 get_tok_str(v
, NULL
));
3003 if ((type1
.t
& VT_BTYPE
) == VT_FUNC
||
3004 (type1
.t
& (VT_TYPEDEF
| VT_STATIC
| VT_EXTERN
| VT_INLINE
)))
3005 tcc_error("invalid type for '%s'",
3006 get_tok_str(v
, NULL
));
3010 bit_size
= expr_const();
3011 /* XXX: handle v = 0 case for messages */
3013 tcc_error("negative width in bit-field '%s'",
3014 get_tok_str(v
, NULL
));
3015 if (v
&& bit_size
== 0)
3016 tcc_error("zero width for bit-field '%s'",
3017 get_tok_str(v
, NULL
));
3019 size
= type_size(&type1
, &align
);
3021 if (align
< ad
.a
.aligned
)
3022 align
= ad
.a
.aligned
;
3023 } else if (ad
.a
.packed
) {
3025 } else if (*tcc_state
->pack_stack_ptr
) {
3026 if (align
> *tcc_state
->pack_stack_ptr
)
3027 align
= *tcc_state
->pack_stack_ptr
;
3030 if (bit_size
>= 0) {
3031 bt
= type1
.t
& VT_BTYPE
;
3038 tcc_error("bitfields must have scalar type");
3040 if (bit_size
> bsize
) {
3041 tcc_error("width of '%s' exceeds its type",
3042 get_tok_str(v
, NULL
));
3043 } else if (bit_size
== bsize
) {
3044 /* no need for bit fields */
3046 } else if (bit_size
== 0) {
3047 /* XXX: what to do if only padding in a
3049 /* zero size: means to pad */
3052 /* we do not have enough room ?
3053 did the type change?
3055 if ((bit_pos
+ bit_size
) > bsize
||
3056 bt
!= prevbt
|| a
== TOK_UNION
)
3059 /* XXX: handle LSB first */
3060 type1
.t
|= VT_BITFIELD
|
3061 (bit_pos
<< VT_STRUCT_SHIFT
) |
3062 (bit_size
<< (VT_STRUCT_SHIFT
+ 6));
3063 bit_pos
+= bit_size
;
3069 if (v
!= 0 || (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
3070 /* add new memory data only if starting
3072 if (lbit_pos
== 0) {
3073 if (a
== TOK_STRUCT
) {
3074 c
= (c
+ align
- 1) & -align
;
3083 if (align
> maxalign
)
3087 printf("add field %s offset=%d",
3088 get_tok_str(v
, NULL
), offset
);
3089 if (type1
.t
& VT_BITFIELD
) {
3090 printf(" pos=%d size=%d",
3091 (type1
.t
>> VT_STRUCT_SHIFT
) & 0x3f,
3092 (type1
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f);
3097 if (v
== 0 && (type1
.t
& VT_BTYPE
) == VT_STRUCT
) {
3099 while ((ass
= ass
->next
) != NULL
) {
3100 ss
= sym_push(ass
->v
, &ass
->type
, 0, offset
+ ass
->c
);
3105 ss
= sym_push(v
| SYM_FIELD
, &type1
, 0, offset
);
3109 if (tok
== ';' || tok
== TOK_EOF
)
3116 /* store size and alignment */
3117 s
->c
= (c
+ maxalign
- 1) & -maxalign
;
3123 /* return 1 if basic type is a type size (short, long, long long) */
3124 ST_FUNC
int is_btype_size(int bt
)
3126 return bt
== VT_SHORT
|| bt
== VT_LONG
|| bt
== VT_LLONG
;
3129 /* return 0 if no type declaration. otherwise, return the basic type
3132 static int parse_btype(CType
*type
, AttributeDef
*ad
)
3134 int t
, u
, bt_size
, complete
, type_found
, typespec_found
;
3138 memset(ad
, 0, sizeof(AttributeDef
));
3146 /* currently, we really ignore extension */
3157 tcc_error("too many basic types");
3159 bt_size
= is_btype_size (u
& VT_BTYPE
);
3160 if (u
== VT_INT
|| (!bt_size
&& !(t
& VT_TYPEDEF
)))
3175 if ((t
& VT_BTYPE
) == VT_DOUBLE
) {
3176 #ifndef TCC_TARGET_PE
3177 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3179 } else if ((t
& VT_BTYPE
) == VT_LONG
) {
3180 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3186 #ifdef TCC_TARGET_ARM64
3188 /* GCC's __uint128_t appears in some Linux header files. Make it a
3189 synonym for long double to get the size and alignment right. */
3201 if ((t
& VT_BTYPE
) == VT_LONG
) {
3202 #ifdef TCC_TARGET_PE
3203 t
= (t
& ~VT_BTYPE
) | VT_DOUBLE
;
3205 t
= (t
& ~VT_BTYPE
) | VT_LDOUBLE
;
3213 struct_decl(&type1
, VT_ENUM
, t
& (VT_TYPEDEF
| VT_EXTERN
));
3216 type
->ref
= type1
.ref
;
3220 struct_decl(&type1
, VT_STRUCT
, t
& (VT_TYPEDEF
| VT_EXTERN
));
3223 /* type modifiers */
3239 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == (VT_DEFSIGN
|VT_UNSIGNED
))
3240 tcc_error("signed and unsigned modifier");
3253 if ((t
& (VT_DEFSIGN
|VT_UNSIGNED
)) == VT_DEFSIGN
)
3254 tcc_error("signed and unsigned modifier");
3255 t
|= VT_DEFSIGN
| VT_UNSIGNED
;
3280 /* GNUC attribute */
3281 case TOK_ATTRIBUTE1
:
3282 case TOK_ATTRIBUTE2
:
3283 parse_attribute(ad
);
3286 t
= (t
& ~VT_BTYPE
) | u
;
3294 parse_expr_type(&type1
);
3295 /* remove all storage modifiers except typedef */
3296 type1
.t
&= ~(VT_STORAGE
&~VT_TYPEDEF
);
3302 if (!s
|| !(s
->type
.t
& VT_TYPEDEF
))
3304 t
|= (s
->type
.t
& ~VT_TYPEDEF
);
3305 type
->ref
= s
->type
.ref
;
3307 /* get attributes from typedef */
3308 if (0 == ad
->a
.aligned
)
3309 ad
->a
.aligned
= s
->a
.aligned
;
3310 if (0 == ad
->a
.func_call
)
3311 ad
->a
.func_call
= s
->a
.func_call
;
3312 ad
->a
.packed
|= s
->a
.packed
;
3321 if (tcc_state
->char_is_unsigned
) {
3322 if ((t
& (VT_DEFSIGN
|VT_BTYPE
)) == VT_BYTE
)
3326 /* long is never used as type */
3327 if ((t
& VT_BTYPE
) == VT_LONG
)
3328 #if (!defined TCC_TARGET_X86_64 && !defined TCC_TARGET_ARM64) || \
3329 defined TCC_TARGET_PE
3330 t
= (t
& ~VT_BTYPE
) | VT_INT
;
3332 t
= (t
& ~VT_BTYPE
) | VT_LLONG
;
3338 /* convert a function parameter type (array to pointer and function to
3339 function pointer) */
3340 static inline void convert_parameter_type(CType
*pt
)
3342 /* remove const and volatile qualifiers (XXX: const could be used
3343 to indicate a const function parameter */
3344 pt
->t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3345 /* array must be transformed to pointer according to ANSI C */
3347 if ((pt
->t
& VT_BTYPE
) == VT_FUNC
) {
3352 ST_FUNC
void parse_asm_str(CString
*astr
)
3355 /* read the string */
3357 expect("string constant");
3359 while (tok
== TOK_STR
) {
3360 /* XXX: add \0 handling too ? */
3361 cstr_cat(astr
, tokc
.cstr
->data
);
3364 cstr_ccat(astr
, '\0');
3367 /* Parse an asm label and return the label
3368 * Don't forget to free the CString in the caller! */
3369 static void asm_label_instr(CString
*astr
)
3372 parse_asm_str(astr
);
3375 printf("asm_alias: \"%s\"\n", (char *)astr
->data
);
3379 static void post_type(CType
*type
, AttributeDef
*ad
)
3381 int n
, l
, t1
, arg_size
, align
;
3382 Sym
**plast
, *s
, *first
;
3387 /* function declaration */
3395 /* read param name and compute offset */
3396 if (l
!= FUNC_OLD
) {
3397 if (!parse_btype(&pt
, &ad1
)) {
3399 tcc_error("invalid type");
3406 if ((pt
.t
& VT_BTYPE
) == VT_VOID
&& tok
== ')')
3408 type_decl(&pt
, &ad1
, &n
, TYPE_DIRECT
| TYPE_ABSTRACT
);
3409 if ((pt
.t
& VT_BTYPE
) == VT_VOID
)
3410 tcc_error("parameter declared as void");
3411 arg_size
+= (type_size(&pt
, &align
) + PTR_SIZE
- 1) / PTR_SIZE
;
3416 expect("identifier");
3420 convert_parameter_type(&pt
);
3421 s
= sym_push(n
| SYM_FIELD
, &pt
, 0, 0);
3427 if (l
== FUNC_NEW
&& tok
== TOK_DOTS
) {
3434 /* if no parameters, then old type prototype */
3438 /* NOTE: const is ignored in returned type as it has a special
3439 meaning in gcc / C++ */
3440 type
->t
&= ~VT_CONSTANT
;
3441 /* some ancient pre-K&R C allows a function to return an array
3442 and the array brackets to be put after the arguments, such
3443 that "int c()[]" means something like "int[] c()" */
3446 skip(']'); /* only handle simple "[]" */
3449 /* we push a anonymous symbol which will contain the function prototype */
3450 ad
->a
.func_args
= arg_size
;
3451 s
= sym_push(SYM_FIELD
, type
, 0, l
);
3456 } else if (tok
== '[') {
3457 /* array definition */
3459 if (tok
== TOK_RESTRICT1
)
3464 if (!local_stack
|| nocode_wanted
)
3465 vpushi(expr_const());
3467 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3470 tcc_error("invalid array size");
3472 if (!is_integer_btype(vtop
->type
.t
& VT_BTYPE
))
3473 tcc_error("size of variable length array should be an integer");
3478 /* parse next post type */
3479 post_type(type
, ad
);
3480 if (type
->t
== VT_FUNC
)
3481 tcc_error("declaration of an array of functions");
3482 t1
|= type
->t
& VT_VLA
;
3485 loc
-= type_size(&int_type
, &align
);
3489 vla_runtime_type_size(type
, &align
);
3491 vset(&int_type
, VT_LOCAL
|VT_LVAL
, n
);
3498 /* we push an anonymous symbol which will contain the array
3500 s
= sym_push(SYM_FIELD
, type
, 0, n
);
3501 type
->t
= (t1
? VT_VLA
: VT_ARRAY
) | VT_PTR
;
3506 /* Parse a type declaration (except basic type), and return the type
3507 in 'type'. 'td' is a bitmask indicating which kind of type decl is
3508 expected. 'type' should contain the basic type. 'ad' is the
3509 attribute definition of the basic type. It can be modified by
3512 static void type_decl(CType
*type
, AttributeDef
*ad
, int *v
, int td
)
3515 CType type1
, *type2
;
3516 int qualifiers
, storage
;
3518 while (tok
== '*') {
3526 qualifiers
|= VT_CONSTANT
;
3531 qualifiers
|= VT_VOLATILE
;
3539 type
->t
|= qualifiers
;
3542 /* XXX: clarify attribute handling */
3543 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3544 parse_attribute(ad
);
3546 /* recursive type */
3547 /* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
3548 type1
.t
= 0; /* XXX: same as int */
3551 /* XXX: this is not correct to modify 'ad' at this point, but
3552 the syntax is not clear */
3553 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3554 parse_attribute(ad
);
3555 type_decl(&type1
, ad
, v
, td
);
3558 /* type identifier */
3559 if (tok
>= TOK_IDENT
&& (td
& TYPE_DIRECT
)) {
3563 if (!(td
& TYPE_ABSTRACT
))
3564 expect("identifier");
3568 storage
= type
->t
& VT_STORAGE
;
3569 type
->t
&= ~VT_STORAGE
;
3570 if (storage
& VT_STATIC
) {
3571 int saved_nocode_wanted
= nocode_wanted
;
3573 post_type(type
, ad
);
3574 nocode_wanted
= saved_nocode_wanted
;
3576 post_type(type
, ad
);
3578 if (tok
== TOK_ATTRIBUTE1
|| tok
== TOK_ATTRIBUTE2
)
3579 parse_attribute(ad
);
3583 /* append type at the end of type1 */
3596 /* compute the lvalue VT_LVAL_xxx needed to match type t. */
3597 ST_FUNC
int lvalue_type(int t
)
3602 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
3604 else if (bt
== VT_SHORT
)
3608 if (t
& VT_UNSIGNED
)
3609 r
|= VT_LVAL_UNSIGNED
;
3613 /* indirection with full error checking and bound check */
3614 ST_FUNC
void indir(void)
3616 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
) {
3617 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FUNC
)
3621 if ((vtop
->r
& VT_LVAL
) && !nocode_wanted
)
3623 vtop
->type
= *pointed_type(&vtop
->type
);
3624 /* Arrays and functions are never lvalues */
3625 if (!(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_VLA
)
3626 && (vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
3627 vtop
->r
|= lvalue_type(vtop
->type
.t
);
3628 /* if bound checking, the referenced pointer must be checked */
3629 #ifdef CONFIG_TCC_BCHECK
3630 if (tcc_state
->do_bounds_check
)
3631 vtop
->r
|= VT_MUSTBOUND
;
3636 /* pass a parameter to a function and do type checking and casting */
3637 static void gfunc_param_typed(Sym
*func
, Sym
*arg
)
3642 func_type
= func
->c
;
3643 if (func_type
== FUNC_OLD
||
3644 (func_type
== FUNC_ELLIPSIS
&& arg
== NULL
)) {
3645 /* default casting : only need to convert float to double */
3646 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
) {
3649 } else if (vtop
->type
.t
& VT_BITFIELD
) {
3650 type
.t
= vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
);
3653 } else if (arg
== NULL
) {
3654 tcc_error("too many arguments to function");
3657 type
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
3658 gen_assign_cast(&type
);
3662 /* parse an expression of the form '(type)' or '(expr)' and return its
3664 static void parse_expr_type(CType
*type
)
3670 if (parse_btype(type
, &ad
)) {
3671 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3678 static void parse_type(CType
*type
)
3683 if (!parse_btype(type
, &ad
)) {
3686 type_decl(type
, &ad
, &n
, TYPE_ABSTRACT
);
3689 static void vpush_tokc(int t
)
3694 vsetc(&type
, VT_CONST
, &tokc
);
3697 ST_FUNC
void unary(void)
3699 int n
, t
, align
, size
, r
, sizeof_caller
;
3703 static int in_sizeof
= 0;
3705 sizeof_caller
= in_sizeof
;
3707 /* XXX: GCC 2.95.3 does not generate a table although it should be
3721 vpush_tokc(VT_INT
| VT_UNSIGNED
);
3725 vpush_tokc(VT_LLONG
);
3729 vpush_tokc(VT_LLONG
| VT_UNSIGNED
);
3733 vpush_tokc(VT_FLOAT
);
3737 vpush_tokc(VT_DOUBLE
);
3741 vpush_tokc(VT_LDOUBLE
);
3744 case TOK___FUNCTION__
:
3746 goto tok_identifier
;
3752 /* special function name identifier */
3753 len
= strlen(funcname
) + 1;
3754 /* generate char[len] type */
3759 vpush_ref(&type
, data_section
, data_section
->data_offset
, len
);
3760 ptr
= section_ptr_add(data_section
, len
);
3761 memcpy(ptr
, funcname
, len
);
3766 #ifdef TCC_TARGET_PE
3767 t
= VT_SHORT
| VT_UNSIGNED
;
3773 /* string parsing */
3776 if (tcc_state
->warn_write_strings
)
3781 memset(&ad
, 0, sizeof(AttributeDef
));
3782 decl_initializer_alloc(&type
, &ad
, VT_CONST
, 2, 0, NULL
, 0);
3787 if (parse_btype(&type
, &ad
)) {
3788 type_decl(&type
, &ad
, &n
, TYPE_ABSTRACT
);
3790 /* check ISOC99 compound literal */
3792 /* data is allocated locally by default */
3797 /* all except arrays are lvalues */
3798 if (!(type
.t
& VT_ARRAY
))
3799 r
|= lvalue_type(type
.t
);
3800 memset(&ad
, 0, sizeof(AttributeDef
));
3801 decl_initializer_alloc(&type
, &ad
, r
, 1, 0, NULL
, 0);
3803 if (sizeof_caller
) {
3810 } else if (tok
== '{') {
3813 tcc_error("statement expression in global scope"); */
3814 /* this check breaks compilation of the linux 2.4.26 with the meesage:
3815 linux/include/net/tcp.h:945: error: statement expression in global scope */
3817 /* save all registers */
3819 /* statement expression : we do not accept break/continue
3820 inside as GCC does */
3821 block(NULL
, NULL
, NULL
, NULL
, 0, 1);
3836 /* functions names must be treated as function pointers,
3837 except for unary '&' and sizeof. Since we consider that
3838 functions are not lvalues, we only have to handle it
3839 there and in function calls. */
3840 /* arrays can also be used although they are not lvalues */
3841 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
&&
3842 !(vtop
->type
.t
& VT_ARRAY
) && !(vtop
->type
.t
& VT_LLOCAL
))
3844 mk_pointer(&vtop
->type
);
3850 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
3852 boolean
.t
= VT_BOOL
;
3854 vtop
->c
.i
= !vtop
->c
.i
;
3855 } else if ((vtop
->r
& VT_VALMASK
) == VT_CMP
)
3856 vtop
->c
.i
= vtop
->c
.i
^ 1;
3857 else if (!nocode_wanted
) {
3859 vseti(VT_JMP
, gvtst(1, 0));
3873 if ((vtop
->type
.t
& VT_BTYPE
) == VT_PTR
)
3874 tcc_error("pointer not accepted for unary plus");
3875 /* In order to force cast, we add zero, except for floating point
3876 where we really need an noop (otherwise -0.0 will be transformed
3878 if (!is_float(vtop
->type
.t
)) {
3889 unary_type(&type
); // Perform a in_sizeof = 0;
3890 size
= type_size(&type
, &align
);
3891 if (t
== TOK_SIZEOF
) {
3892 if (!(type
.t
& VT_VLA
)) {
3894 tcc_error("sizeof applied to an incomplete type");
3897 vla_runtime_type_size(&type
, &align
);
3902 vtop
->type
.t
|= VT_UNSIGNED
;
3905 case TOK_builtin_types_compatible_p
:
3914 type1
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3915 type2
.t
&= ~(VT_CONSTANT
| VT_VOLATILE
);
3916 vpushi(is_compatible_types(&type1
, &type2
));
3919 case TOK_builtin_constant_p
:
3921 int saved_nocode_wanted
, res
;
3924 saved_nocode_wanted
= nocode_wanted
;
3927 res
= (vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
;
3929 nocode_wanted
= saved_nocode_wanted
;
3934 case TOK_builtin_frame_address
:
3935 case TOK_builtin_return_address
:
3942 if (tok
!= TOK_CINT
|| tokc
.i
< 0) {
3943 tcc_error("%s only takes positive integers",
3944 tok1
== TOK_builtin_return_address
?
3945 "__builtin_return_address" :
3946 "__builtin_frame_address");
3953 vset(&type
, VT_LOCAL
, 0); /* local frame */
3955 mk_pointer(&vtop
->type
);
3956 indir(); /* -> parent frame */
3958 if (tok1
== TOK_builtin_return_address
) {
3959 // assume return address is just above frame pointer on stack
3962 mk_pointer(&vtop
->type
);
3967 #ifdef TCC_TARGET_X86_64
3968 #ifdef TCC_TARGET_PE
3969 case TOK_builtin_va_start
:
3977 if ((vtop
->r
& VT_VALMASK
) != VT_LOCAL
)
3978 tcc_error("__builtin_va_start expects a local variable");
3979 vtop
->r
&= ~(VT_LVAL
| VT_REF
);
3980 vtop
->type
= char_pointer_type
;
3985 case TOK_builtin_va_arg_types
:
3992 vpushi(classify_x86_64_va_arg(&type
));
3998 #ifdef TCC_TARGET_ARM64
3999 case TOK___va_start
: {
4001 tcc_error("statement in global scope");
4011 vtop
->type
.t
= VT_VOID
;
4014 case TOK___va_arg
: {
4017 tcc_error("statement in global scope");
4029 case TOK___arm64_clear_cache
: {
4038 vtop
->type
.t
= VT_VOID
;
4042 /* pre operations */
4053 t
= vtop
->type
.t
& VT_BTYPE
;
4055 /* In IEEE negate(x) isn't subtract(0,x), but rather
4060 else if (t
== VT_DOUBLE
)
4071 goto tok_identifier
;
4073 /* allow to take the address of a label */
4074 if (tok
< TOK_UIDENT
)
4075 expect("label identifier");
4076 s
= label_find(tok
);
4078 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
4080 if (s
->r
== LABEL_DECLARED
)
4081 s
->r
= LABEL_FORWARD
;
4084 s
->type
.t
= VT_VOID
;
4085 mk_pointer(&s
->type
);
4086 s
->type
.t
|= VT_STATIC
;
4088 vpushsym(&s
->type
, s
);
4092 // special qnan , snan and infinity values
4094 vpush64(VT_DOUBLE
, 0x7ff8000000000000ULL
);
4098 vpush64(VT_DOUBLE
, 0x7ff0000000000001ULL
);
4102 vpush64(VT_DOUBLE
, 0x7ff0000000000000ULL
);
4111 expect("identifier");
4114 const char *name
= get_tok_str(t
, NULL
);
4116 tcc_error("'%s' undeclared", name
);
4117 /* for simple function calls, we tolerate undeclared
4118 external reference to int() function */
4119 if (tcc_state
->warn_implicit_function_declaration
4120 #ifdef TCC_TARGET_PE
4121 /* people must be warned about using undeclared WINAPI functions
4122 (which usually start with uppercase letter) */
4123 || (name
[0] >= 'A' && name
[0] <= 'Z')
4126 tcc_warning("implicit declaration of function '%s'", name
);
4127 s
= external_global_sym(t
, &func_old_type
, 0);
4129 if ((s
->type
.t
& (VT_STATIC
| VT_INLINE
| VT_BTYPE
)) ==
4130 (VT_STATIC
| VT_INLINE
| VT_FUNC
)) {
4131 /* if referencing an inline function, then we generate a
4132 symbol to it if not already done. It will have the
4133 effect to generate code for it at the end of the
4134 compilation unit. Inline function as always
4135 generated in the text section. */
4137 put_extern_sym(s
, text_section
, 0, 0);
4138 r
= VT_SYM
| VT_CONST
;
4142 vset(&s
->type
, r
, s
->c
);
4143 /* if forward reference, we must point to s */
4144 if (vtop
->r
& VT_SYM
) {
4146 vtop
->c
.ptr_offset
= 0;
4151 /* post operations */
4153 if (tok
== TOK_INC
|| tok
== TOK_DEC
) {
4156 } else if (tok
== '.' || tok
== TOK_ARROW
|| tok
== TOK_CDOUBLE
) {
4159 if (tok
== TOK_ARROW
)
4161 qualifiers
= vtop
->type
.t
& (VT_CONSTANT
| VT_VOLATILE
);
4164 /* expect pointer on structure */
4165 if ((vtop
->type
.t
& VT_BTYPE
) != VT_STRUCT
)
4166 expect("struct or union");
4167 if (tok
== TOK_CDOUBLE
)
4168 expect("field name");
4170 if (tok
== TOK_CINT
|| tok
== TOK_CUINT
)
4171 expect("field name");
4175 while ((s
= s
->next
) != NULL
) {
4180 tcc_error("field not found: %s", get_tok_str(tok
& ~SYM_FIELD
, NULL
));
4181 /* add field offset to pointer */
4182 vtop
->type
= char_pointer_type
; /* change type to 'char *' */
4185 /* change type to field type, and set to lvalue */
4186 vtop
->type
= s
->type
;
4187 vtop
->type
.t
|= qualifiers
;
4188 /* an array is never an lvalue */
4189 if (!(vtop
->type
.t
& VT_ARRAY
)) {
4190 vtop
->r
|= lvalue_type(vtop
->type
.t
);
4191 #ifdef CONFIG_TCC_BCHECK
4192 /* if bound checking, the referenced pointer must be checked */
4193 if (tcc_state
->do_bounds_check
)
4194 vtop
->r
|= VT_MUSTBOUND
;
4198 } else if (tok
== '[') {
4204 } else if (tok
== '(') {
4207 int nb_args
, ret_nregs
, ret_align
, regsize
, variadic
;
4210 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
) {
4211 /* pointer test (no array accepted) */
4212 if ((vtop
->type
.t
& (VT_BTYPE
| VT_ARRAY
)) == VT_PTR
) {
4213 vtop
->type
= *pointed_type(&vtop
->type
);
4214 if ((vtop
->type
.t
& VT_BTYPE
) != VT_FUNC
)
4218 expect("function pointer");
4221 vtop
->r
&= ~VT_LVAL
; /* no lvalue */
4223 /* get return type */
4226 sa
= s
->next
; /* first parameter */
4229 /* compute first implicit argument if a structure is returned */
4230 if ((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
4231 variadic
= (s
->c
== FUNC_ELLIPSIS
);
4232 ret_nregs
= gfunc_sret(&s
->type
, variadic
, &ret
.type
,
4233 &ret_align
, ®size
);
4235 /* get some space for the returned structure */
4236 size
= type_size(&s
->type
, &align
);
4237 #ifdef TCC_TARGET_ARM64
4238 /* On arm64, a small struct is return in registers.
4239 It is much easier to write it to memory if we know
4240 that we are allowed to write some extra bytes, so
4241 round the allocated space up to a power of 2: */
4243 while (size
& (size
- 1))
4244 size
= (size
| (size
- 1)) + 1;
4246 loc
= (loc
- size
) & -align
;
4248 ret
.r
= VT_LOCAL
| VT_LVAL
;
4249 /* pass it as 'int' to avoid structure arg passing
4251 vseti(VT_LOCAL
, loc
);
4261 /* return in register */
4262 if (is_float(ret
.type
.t
)) {
4263 ret
.r
= reg_fret(ret
.type
.t
);
4264 #ifdef TCC_TARGET_X86_64
4265 if ((ret
.type
.t
& VT_BTYPE
) == VT_QFLOAT
)
4269 #ifndef TCC_TARGET_ARM64
4270 #ifdef TCC_TARGET_X86_64
4271 if ((ret
.type
.t
& VT_BTYPE
) == VT_QLONG
)
4273 if ((ret
.type
.t
& VT_BTYPE
) == VT_LLONG
)
4284 gfunc_param_typed(s
, sa
);
4294 tcc_error("too few arguments to function");
4296 if (!nocode_wanted
) {
4297 gfunc_call(nb_args
);
4299 vtop
-= (nb_args
+ 1);
4303 for (r
= ret
.r
+ ret_nregs
+ !ret_nregs
; r
-- > ret
.r
;) {
4304 vsetc(&ret
.type
, r
, &ret
.c
);
4305 vtop
->r2
= ret
.r2
; /* Loop only happens when r2 is VT_CONST */
4308 /* handle packed struct return */
4309 if (((s
->type
.t
& VT_BTYPE
) == VT_STRUCT
) && ret_nregs
) {
4312 size
= type_size(&s
->type
, &align
);
4313 /* We're writing whole regs often, make sure there's enough
4314 space. Assume register size is power of 2. */
4315 if (regsize
> align
)
4317 loc
= (loc
- size
) & -align
;
4321 vset(&ret
.type
, VT_LOCAL
| VT_LVAL
, addr
+ offset
);
4325 if (--ret_nregs
== 0)
4329 vset(&s
->type
, VT_LOCAL
| VT_LVAL
, addr
);
4337 ST_FUNC
void expr_prod(void)
4342 while (tok
== '*' || tok
== '/' || tok
== '%') {
4350 ST_FUNC
void expr_sum(void)
4355 while (tok
== '+' || tok
== '-') {
4363 static void expr_shift(void)
4368 while (tok
== TOK_SHL
|| tok
== TOK_SAR
) {
4376 static void expr_cmp(void)
4381 while ((tok
>= TOK_ULE
&& tok
<= TOK_GT
) ||
4382 tok
== TOK_ULT
|| tok
== TOK_UGE
) {
4390 static void expr_cmpeq(void)
4395 while (tok
== TOK_EQ
|| tok
== TOK_NE
) {
4403 static void expr_and(void)
4406 while (tok
== '&') {
4413 static void expr_xor(void)
4416 while (tok
== '^') {
4423 static void expr_or(void)
4426 while (tok
== '|') {
4433 /* XXX: fix this mess */
4434 static void expr_land_const(void)
4437 while (tok
== TOK_LAND
) {
4444 /* XXX: fix this mess */
4445 static void expr_lor_const(void)
4448 while (tok
== TOK_LOR
) {
4455 /* only used if non constant */
4456 static void expr_land(void)
4461 if (tok
== TOK_LAND
) {
4466 if (tok
!= TOK_LAND
) {
4476 static void expr_lor(void)
4481 if (tok
== TOK_LOR
) {
4486 if (tok
!= TOK_LOR
) {
4496 /* XXX: better constant handling */
4497 static void expr_cond(void)
4499 int tt
, u
, r1
, r2
, rc
, t1
, t2
, bt1
, bt2
;
4501 CType type
, type1
, type2
;
4508 boolean
.t
= VT_BOOL
;
4514 if (tok
!= ':' || !gnu_ext
) {
4529 if (vtop
!= vstack
) {
4530 /* needed to avoid having different registers saved in
4532 if (is_float(vtop
->type
.t
)) {
4534 #ifdef TCC_TARGET_X86_64
4535 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4545 if (tok
== ':' && gnu_ext
) {
4553 sv
= *vtop
; /* save value to handle it later */
4554 vtop
--; /* no vpop so that FP stack is not flushed */
4562 bt1
= t1
& VT_BTYPE
;
4564 bt2
= t2
& VT_BTYPE
;
4565 /* cast operands to correct type according to ISOC rules */
4566 if (is_float(bt1
) || is_float(bt2
)) {
4567 if (bt1
== VT_LDOUBLE
|| bt2
== VT_LDOUBLE
) {
4568 type
.t
= VT_LDOUBLE
;
4569 } else if (bt1
== VT_DOUBLE
|| bt2
== VT_DOUBLE
) {
4574 } else if (bt1
== VT_LLONG
|| bt2
== VT_LLONG
) {
4575 /* cast to biggest op */
4577 /* convert to unsigned if it does not fit in a long long */
4578 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
) ||
4579 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_LLONG
| VT_UNSIGNED
))
4580 type
.t
|= VT_UNSIGNED
;
4581 } else if (bt1
== VT_PTR
|| bt2
== VT_PTR
) {
4582 /* If one is a null ptr constant the result type
4584 if (is_null_pointer (vtop
))
4586 else if (is_null_pointer (&sv
))
4588 /* XXX: test pointer compatibility, C99 has more elaborate
4592 } else if (bt1
== VT_FUNC
|| bt2
== VT_FUNC
) {
4593 /* XXX: test function pointer compatibility */
4594 type
= bt1
== VT_FUNC
? type1
: type2
;
4595 } else if (bt1
== VT_STRUCT
|| bt2
== VT_STRUCT
) {
4596 /* XXX: test structure compatibility */
4597 type
= bt1
== VT_STRUCT
? type1
: type2
;
4598 } else if (bt1
== VT_VOID
|| bt2
== VT_VOID
) {
4599 /* NOTE: as an extension, we accept void on only one side */
4602 /* integer operations */
4604 /* convert to unsigned if it does not fit in an integer */
4605 if ((t1
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
) ||
4606 (t2
& (VT_BTYPE
| VT_UNSIGNED
)) == (VT_INT
| VT_UNSIGNED
))
4607 type
.t
|= VT_UNSIGNED
;
4610 /* now we convert second operand */
4612 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4615 if (is_float(type
.t
)) {
4617 #ifdef TCC_TARGET_X86_64
4618 if ((type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
4622 } else if ((type
.t
& VT_BTYPE
) == VT_LLONG
) {
4623 /* for long longs, we use fixed registers to avoid having
4624 to handle a complicated move */
4629 /* this is horrible, but we must also convert first
4633 /* put again first value and cast it */
4636 if (VT_STRUCT
== (vtop
->type
.t
& VT_BTYPE
))
4639 move_reg(r2
, r1
, type
.t
);
4646 static void expr_eq(void)
4652 (tok
>= TOK_A_MOD
&& tok
<= TOK_A_DIV
) ||
4653 tok
== TOK_A_XOR
|| tok
== TOK_A_OR
||
4654 tok
== TOK_A_SHL
|| tok
== TOK_A_SAR
) {
4669 ST_FUNC
void gexpr(void)
4680 /* parse an expression and return its type without any side effect. */
4681 static void expr_type(CType
*type
)
4683 int saved_nocode_wanted
;
4685 saved_nocode_wanted
= nocode_wanted
;
4690 nocode_wanted
= saved_nocode_wanted
;
4693 /* parse a unary expression and return its type without any side
4695 static void unary_type(CType
*type
)
4707 /* parse a constant expression and return value in vtop. */
4708 static void expr_const1(void)
4717 /* parse an integer constant and return its value. */
4718 ST_FUNC
int expr_const(void)
4722 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) != VT_CONST
)
4723 expect("constant expression");
4729 /* return the label token if current token is a label, otherwise
4731 static int is_label(void)
4735 /* fast test first */
4736 if (tok
< TOK_UIDENT
)
4738 /* no need to save tokc because tok is an identifier */
4745 unget_tok(last_tok
);
4750 static void label_or_decl(int l
)
4754 /* fast test first */
4755 if (tok
>= TOK_UIDENT
)
4757 /* no need to save tokc because tok is an identifier */
4761 unget_tok(last_tok
);
4764 unget_tok(last_tok
);
4769 static void block(int *bsym
, int *csym
, int *case_sym
, int *def_sym
,
4770 int case_reg
, int is_expr
)
4773 Sym
*s
, *frame_bottom
;
4775 /* generate line number info */
4776 if (tcc_state
->do_debug
&&
4777 (last_line_num
!= file
->line_num
|| last_ind
!= ind
)) {
4778 put_stabn(N_SLINE
, 0, file
->line_num
, ind
- func_ind
);
4780 last_line_num
= file
->line_num
;
4784 /* default return value is (void) */
4786 vtop
->type
.t
= VT_VOID
;
4789 if (tok
== TOK_IF
) {
4796 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4798 if (c
== TOK_ELSE
) {
4802 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, 0);
4803 gsym(d
); /* patch else jmp */
4806 } else if (tok
== TOK_WHILE
) {
4815 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
4819 } else if (tok
== '{') {
4821 int block_vla_sp_loc
= vla_sp_loc
, saved_vlas_in_scope
= vlas_in_scope
;
4824 /* record local declaration stack position */
4826 frame_bottom
= sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
4827 frame_bottom
->next
= scope_stack_bottom
;
4828 scope_stack_bottom
= frame_bottom
;
4829 llabel
= local_label_stack
;
4831 /* handle local labels declarations */
4832 if (tok
== TOK_LABEL
) {
4835 if (tok
< TOK_UIDENT
)
4836 expect("label identifier");
4837 label_push(&local_label_stack
, tok
, LABEL_DECLARED
);
4847 while (tok
!= '}') {
4848 label_or_decl(VT_LOCAL
);
4852 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
4855 /* pop locally defined labels */
4856 label_pop(&local_label_stack
, llabel
);
4858 /* XXX: this solution makes only valgrind happy...
4859 triggered by gcc.c-torture/execute/20000917-1.c */
4861 switch(vtop
->type
.t
& VT_BTYPE
) {
4863 /* this breaks a compilation of the linux kernel v2.4.26 */
4864 /* pmd_t *new = ({ __asm__ __volatile__("ud2\n") ; ((pmd_t *)1); }); */
4865 /* Look a commit a80acab: Display error on statement expressions with complex return type */
4866 /* A pointer is not a complex return type */
4870 for(p
=vtop
->type
.ref
;p
;p
=p
->prev
)
4872 tcc_error("unsupported expression type");
4875 /* pop locally defined symbols */
4876 scope_stack_bottom
= scope_stack_bottom
->next
;
4877 sym_pop(&local_stack
, s
);
4879 /* Pop VLA frames and restore stack pointer if required */
4880 if (vlas_in_scope
> saved_vlas_in_scope
) {
4881 vla_sp_loc
= saved_vlas_in_scope
? block_vla_sp_loc
: vla_sp_root_loc
;
4884 vlas_in_scope
= saved_vlas_in_scope
;
4887 } else if (tok
== TOK_RETURN
) {
4891 gen_assign_cast(&func_vt
);
4892 #ifdef TCC_TARGET_ARM64
4893 // Perhaps it would be better to use this for all backends:
4896 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
4897 CType type
, ret_type
;
4898 int ret_align
, ret_nregs
, regsize
;
4899 ret_nregs
= gfunc_sret(&func_vt
, func_var
, &ret_type
,
4900 &ret_align
, ®size
);
4901 if (0 == ret_nregs
) {
4902 /* if returning structure, must copy it to implicit
4903 first pointer arg location */
4906 vset(&type
, VT_LOCAL
| VT_LVAL
, func_vc
);
4909 /* copy structure value to pointer */
4912 /* returning structure packed into registers */
4913 int r
, size
, addr
, align
;
4914 size
= type_size(&func_vt
,&align
);
4915 if ((vtop
->r
!= (VT_LOCAL
| VT_LVAL
) || (vtop
->c
.i
& (ret_align
-1)))
4916 && (align
& (ret_align
-1))) {
4917 loc
= (loc
- size
) & -ret_align
;
4920 vset(&type
, VT_LOCAL
| VT_LVAL
, addr
);
4924 vset(&ret_type
, VT_LOCAL
| VT_LVAL
, addr
);
4926 vtop
->type
= ret_type
;
4927 if (is_float(ret_type
.t
))
4928 r
= rc_fret(ret_type
.t
);
4934 if (--ret_nregs
== 0)
4936 /* We assume that when a structure is returned in multiple
4937 registers, their classes are consecutive values of the
4940 vtop
->c
.i
+= regsize
;
4941 vtop
->r
= VT_LOCAL
| VT_LVAL
;
4944 } else if (is_float(func_vt
.t
)) {
4945 gv(rc_fret(func_vt
.t
));
4950 vtop
--; /* NOT vpop() because on x86 it would flush the fp stack */
4953 rsym
= gjmp(rsym
); /* jmp */
4954 } else if (tok
== TOK_BREAK
) {
4957 tcc_error("cannot break");
4958 *bsym
= gjmp(*bsym
);
4961 } else if (tok
== TOK_CONTINUE
) {
4964 tcc_error("cannot continue");
4965 vla_sp_restore_root();
4966 *csym
= gjmp(*csym
);
4969 } else if (tok
== TOK_FOR
) {
4974 frame_bottom
= sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
4975 frame_bottom
->next
= scope_stack_bottom
;
4976 scope_stack_bottom
= frame_bottom
;
4978 /* c99 for-loop init decl? */
4979 if (!decl0(VT_LOCAL
, 1)) {
4980 /* no, regular for-loop init expr */
5006 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
5010 scope_stack_bottom
= scope_stack_bottom
->next
;
5011 sym_pop(&local_stack
, s
);
5013 if (tok
== TOK_DO
) {
5019 block(&a
, &b
, case_sym
, def_sym
, case_reg
, 0);
5030 if (tok
== TOK_SWITCH
) {
5034 /* XXX: other types than integer */
5035 case_reg
= gv(RC_INT
);
5039 b
= gjmp(0); /* jump to first case */
5041 block(&a
, csym
, &b
, &c
, case_reg
, 0);
5042 /* if no default, jmp after switch */
5050 if (tok
== TOK_CASE
) {
5057 if (gnu_ext
&& tok
== TOK_DOTS
) {
5061 tcc_warning("empty case range");
5063 /* since a case is like a label, we must skip it with a jmp */
5071 *case_sym
= gtst(1, 0);
5074 *case_sym
= gtst(1, 0);
5078 *case_sym
= gtst(1, *case_sym
);
5080 case_reg
= gv(RC_INT
);
5085 goto block_after_label
;
5087 if (tok
== TOK_DEFAULT
) {
5093 tcc_error("too many 'default'");
5096 goto block_after_label
;
5098 if (tok
== TOK_GOTO
) {
5100 if (tok
== '*' && gnu_ext
) {
5104 if ((vtop
->type
.t
& VT_BTYPE
) != VT_PTR
)
5107 } else if (tok
>= TOK_UIDENT
) {
5108 s
= label_find(tok
);
5109 /* put forward definition if needed */
5111 s
= label_push(&global_label_stack
, tok
, LABEL_FORWARD
);
5113 if (s
->r
== LABEL_DECLARED
)
5114 s
->r
= LABEL_FORWARD
;
5116 vla_sp_restore_root();
5117 if (s
->r
& LABEL_FORWARD
)
5118 s
->jnext
= gjmp(s
->jnext
);
5120 gjmp_addr(s
->jnext
);
5123 expect("label identifier");
5126 } else if (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
) {
5134 if (s
->r
== LABEL_DEFINED
)
5135 tcc_error("duplicate label '%s'", get_tok_str(s
->v
, NULL
));
5137 s
->r
= LABEL_DEFINED
;
5139 s
= label_push(&global_label_stack
, b
, LABEL_DEFINED
);
5143 /* we accept this, but it is a mistake */
5146 tcc_warning("deprecated use of label at end of compound statement");
5150 block(bsym
, csym
, case_sym
, def_sym
, case_reg
, is_expr
);
5153 /* expression case */
5168 /* t is the array or struct type. c is the array or struct
5169 address. cur_index/cur_field is the pointer to the current
5170 value. 'size_only' is true if only size info is needed (only used
5172 static void decl_designator(CType
*type
, Section
*sec
, unsigned long c
,
5173 int *cur_index
, Sym
**cur_field
,
5177 int notfirst
, index
, index_last
, align
, l
, nb_elems
, elem_size
;
5183 if (gnu_ext
&& (l
= is_label()) != 0)
5185 while (tok
== '[' || tok
== '.') {
5187 if (!(type
->t
& VT_ARRAY
))
5188 expect("array type");
5191 index
= expr_const();
5192 if (index
< 0 || (s
->c
>= 0 && index
>= s
->c
))
5193 expect("invalid index");
5194 if (tok
== TOK_DOTS
&& gnu_ext
) {
5196 index_last
= expr_const();
5197 if (index_last
< 0 ||
5198 (s
->c
>= 0 && index_last
>= s
->c
) ||
5200 expect("invalid index");
5206 *cur_index
= index_last
;
5207 type
= pointed_type(type
);
5208 elem_size
= type_size(type
, &align
);
5209 c
+= index
* elem_size
;
5210 /* NOTE: we only support ranges for last designator */
5211 nb_elems
= index_last
- index
+ 1;
5212 if (nb_elems
!= 1) {
5221 if ((type
->t
& VT_BTYPE
) != VT_STRUCT
)
5222 expect("struct/union type");
5235 /* XXX: fix this mess by using explicit storage field */
5237 type1
.t
|= (type
->t
& ~VT_TYPE
);
5251 if (type
->t
& VT_ARRAY
) {
5253 type
= pointed_type(type
);
5254 c
+= index
* type_size(type
, &align
);
5258 tcc_error("too many field init");
5259 /* XXX: fix this mess by using explicit storage field */
5261 type1
.t
|= (type
->t
& ~VT_TYPE
);
5266 decl_initializer(type
, sec
, c
, 0, size_only
);
5268 /* XXX: make it more general */
5269 if (!size_only
&& nb_elems
> 1) {
5270 unsigned long c_end
;
5275 tcc_error("range init not supported yet for dynamic storage");
5276 c_end
= c
+ nb_elems
* elem_size
;
5277 if (c_end
> sec
->data_allocated
)
5278 section_realloc(sec
, c_end
);
5279 src
= sec
->data
+ c
;
5281 for(i
= 1; i
< nb_elems
; i
++) {
5283 memcpy(dst
, src
, elem_size
);
5289 #define EXPR_CONST 1
5292 /* store a value or an expression directly in global data or in local array */
5293 static void init_putv(CType
*type
, Section
*sec
, unsigned long c
,
5294 int v
, int expr_type
)
5296 int saved_global_expr
, bt
, bit_pos
, bit_size
;
5298 unsigned long long bit_mask
;
5306 /* compound literals must be allocated globally in this case */
5307 saved_global_expr
= global_expr
;
5310 global_expr
= saved_global_expr
;
5311 /* NOTE: symbols are accepted */
5312 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) != VT_CONST
)
5313 tcc_error("initializer element is not constant");
5321 dtype
.t
&= ~VT_CONSTANT
; /* need to do that to avoid false warning */
5324 /* XXX: not portable */
5325 /* XXX: generate error if incorrect relocation */
5326 gen_assign_cast(&dtype
);
5327 bt
= type
->t
& VT_BTYPE
;
5328 /* we'll write at most 16 bytes */
5329 if (c
+ 16 > sec
->data_allocated
) {
5330 section_realloc(sec
, c
+ 16);
5332 ptr
= sec
->data
+ c
;
5333 /* XXX: make code faster ? */
5334 if (!(type
->t
& VT_BITFIELD
)) {
5339 bit_pos
= (vtop
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5340 bit_size
= (vtop
->type
.t
>> (VT_STRUCT_SHIFT
+ 6)) & 0x3f;
5341 bit_mask
= (1LL << bit_size
) - 1;
5343 if ((vtop
->r
& VT_SYM
) &&
5349 (bt
== VT_INT
&& bit_size
!= 32)))
5350 tcc_error("initializer element is not computable at load time");
5352 /* XXX: when cross-compiling we assume that each type has the
5353 same representation on host and target, which is likely to
5354 be wrong in the case of long double */
5356 vtop
->c
.i
= (vtop
->c
.i
!= 0);
5358 *(char *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5361 *(short *)ptr
|= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5364 *(double *)ptr
= vtop
->c
.d
;
5367 *(long double *)ptr
= vtop
->c
.ld
;
5370 *(long long *)ptr
|= (vtop
->c
.ll
& bit_mask
) << bit_pos
;
5373 addr_t val
= (vtop
->c
.ptr_offset
& bit_mask
) << bit_pos
;
5374 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
5375 if (vtop
->r
& VT_SYM
)
5376 greloca(sec
, vtop
->sym
, c
, R_DATA_PTR
, val
);
5378 *(addr_t
*)ptr
|= val
;
5380 if (vtop
->r
& VT_SYM
)
5381 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
5382 *(addr_t
*)ptr
|= val
;
5387 int val
= (vtop
->c
.i
& bit_mask
) << bit_pos
;
5388 #if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
5389 if (vtop
->r
& VT_SYM
)
5390 greloca(sec
, vtop
->sym
, c
, R_DATA_PTR
, val
);
5394 if (vtop
->r
& VT_SYM
)
5395 greloc(sec
, vtop
->sym
, c
, R_DATA_PTR
);
5403 vset(&dtype
, VT_LOCAL
|VT_LVAL
, c
);
5410 /* put zeros for variable based init */
5411 static void init_putz(CType
*t
, Section
*sec
, unsigned long c
, int size
)
5414 /* nothing to do because globals are already set to zero */
5416 vpush_global_sym(&func_old_type
, TOK_memset
);
5418 #ifdef TCC_TARGET_ARM
5429 /* 't' contains the type and storage info. 'c' is the offset of the
5430 object in section 'sec'. If 'sec' is NULL, it means stack based
5431 allocation. 'first' is true if array '{' must be read (multi
5432 dimension implicit array init handling). 'size_only' is true if
5433 size only evaluation is wanted (only for arrays). */
5434 static void decl_initializer(CType
*type
, Section
*sec
, unsigned long c
,
5435 int first
, int size_only
)
5437 int index
, array_length
, n
, no_oblock
, nb
, parlevel
, parlevel1
, i
;
5438 int size1
, align1
, expr_type
;
5442 if (type
->t
& VT_VLA
) {
5445 /* save current stack pointer */
5446 if (vlas_in_scope
== 0) {
5447 if (vla_sp_root_loc
== -1)
5448 vla_sp_root_loc
= (loc
-= PTR_SIZE
);
5449 gen_vla_sp_save(vla_sp_root_loc
);
5452 vla_runtime_type_size(type
, &a
);
5453 gen_vla_alloc(type
, a
);
5457 } else if (type
->t
& VT_ARRAY
) {
5461 t1
= pointed_type(type
);
5462 size1
= type_size(t1
, &align1
);
5465 if ((first
&& tok
!= TOK_LSTR
&& tok
!= TOK_STR
) ||
5468 tcc_error("character array initializer must be a literal,"
5469 " optionally enclosed in braces");
5474 /* only parse strings here if correct type (otherwise: handle
5475 them as ((w)char *) expressions */
5476 if ((tok
== TOK_LSTR
&&
5477 #ifdef TCC_TARGET_PE
5478 (t1
->t
& VT_BTYPE
) == VT_SHORT
&& (t1
->t
& VT_UNSIGNED
)
5480 (t1
->t
& VT_BTYPE
) == VT_INT
5482 ) || (tok
== TOK_STR
&& (t1
->t
& VT_BTYPE
) == VT_BYTE
)) {
5483 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5488 /* compute maximum number of chars wanted */
5490 cstr_len
= cstr
->size
;
5492 cstr_len
= cstr
->size
/ sizeof(nwchar_t
);
5495 if (n
>= 0 && nb
> (n
- array_length
))
5496 nb
= n
- array_length
;
5499 tcc_warning("initializer-string for array is too long");
5500 /* in order to go faster for common case (char
5501 string in global variable, we handle it
5503 if (sec
&& tok
== TOK_STR
&& size1
== 1) {
5504 memcpy(sec
->data
+ c
+ array_length
, cstr
->data
, nb
);
5508 ch
= ((unsigned char *)cstr
->data
)[i
];
5510 ch
= ((nwchar_t
*)cstr
->data
)[i
];
5511 init_putv(t1
, sec
, c
+ (array_length
+ i
) * size1
,
5519 /* only add trailing zero if enough storage (no
5520 warning in this case since it is standard) */
5521 if (n
< 0 || array_length
< n
) {
5523 init_putv(t1
, sec
, c
+ (array_length
* size1
), 0, EXPR_VAL
);
5529 while (tok
!= '}') {
5530 decl_designator(type
, sec
, c
, &index
, NULL
, size_only
);
5531 if (n
>= 0 && index
>= n
)
5532 tcc_error("index too large");
5533 /* must put zero in holes (note that doing it that way
5534 ensures that it even works with designators) */
5535 if (!size_only
&& array_length
< index
) {
5536 init_putz(t1
, sec
, c
+ array_length
* size1
,
5537 (index
- array_length
) * size1
);
5540 if (index
> array_length
)
5541 array_length
= index
;
5542 /* special test for multi dimensional arrays (may not
5543 be strictly correct if designators are used at the
5545 if (index
>= n
&& no_oblock
)
5554 /* put zeros at the end */
5555 if (!size_only
&& n
>= 0 && array_length
< n
) {
5556 init_putz(t1
, sec
, c
+ array_length
* size1
,
5557 (n
- array_length
) * size1
);
5559 /* patch type size if needed */
5561 s
->c
= array_length
;
5562 } else if ((type
->t
& VT_BTYPE
) == VT_STRUCT
&&
5563 (sec
|| !first
|| tok
== '{')) {
5565 /* NOTE: the previous test is a specific case for automatic
5566 struct/union init */
5567 /* XXX: union needs only one init */
5574 if (tcc_state
->old_struct_init_code
) {
5575 /* an old version of struct initialization.
5576 It have a problems. But with a new version
5577 linux 2.4.26 can't load ramdisk.
5579 while (tok
== '(') {
5583 if (!parse_btype(&type1
, &ad1
))
5585 type_decl(&type1
, &ad1
, &n
, TYPE_ABSTRACT
);
5587 if (!is_assignable_types(type
, &type1
))
5588 tcc_error("invalid type for cast");
5595 if (!parse_btype(&type1
, &ad1
))
5597 type_decl(&type1
, &ad1
, &n
, TYPE_ABSTRACT
);
5599 if (!is_assignable_types(type
, &type1
))
5600 tcc_error("invalid type for cast");
5609 if (first
|| tok
== '{') {
5618 while (tok
!= '}') {
5619 decl_designator(type
, sec
, c
, NULL
, &f
, size_only
);
5621 if (!size_only
&& array_length
< index
) {
5622 init_putz(type
, sec
, c
+ array_length
,
5623 index
- array_length
);
5625 index
= index
+ type_size(&f
->type
, &align1
);
5626 if (index
> array_length
)
5627 array_length
= index
;
5629 /* gr: skip fields from same union - ugly. */
5632 int f_size
= type_size(&f
->type
, &align
);
5633 int f_type
= (f
->type
.t
& VT_BTYPE
);
5635 ///printf("index: %2d %08x -- %2d %08x\n", f->c, f->type.t, f->next->c, f->next->type.t);
5636 /* test for same offset */
5637 if (f
->next
->c
!= f
->c
)
5639 if ((f_type
== VT_STRUCT
) && (f_size
== 0)) {
5641 Lets assume a structure of size 0 can't be a member of the union.
5642 This allow to compile the following code from a linux kernel v2.4.26
5643 typedef struct { } rwlock_t;
5649 struct fs_struct init_fs = { { (1) }, (rwlock_t) {}, 0022, };
5650 tcc-0.9.23 can succesfully compile this version of the kernel.
5651 gcc don't have problems with this code too.
5655 /* if yes, test for bitfield shift */
5656 if ((f
->type
.t
& VT_BITFIELD
) && (f
->next
->type
.t
& VT_BITFIELD
)) {
5657 int bit_pos_1
= (f
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5658 int bit_pos_2
= (f
->next
->type
.t
>> VT_STRUCT_SHIFT
) & 0x3f;
5659 //printf("bitfield %d %d\n", bit_pos_1, bit_pos_2);
5660 if (bit_pos_1
!= bit_pos_2
)
5667 if (no_oblock
&& f
== NULL
)
5673 /* put zeros at the end */
5674 if (!size_only
&& array_length
< n
) {
5675 init_putz(type
, sec
, c
+ array_length
,
5684 } else if (tok
== '{') {
5686 decl_initializer(type
, sec
, c
, first
, size_only
);
5688 } else if (size_only
) {
5689 /* just skip expression */
5690 parlevel
= parlevel1
= 0;
5691 while ((parlevel
> 0 || parlevel1
> 0 ||
5692 (tok
!= '}' && tok
!= ',')) && tok
!= -1) {
5695 else if (tok
== ')') {
5696 if (parlevel
== 0 && parlevel1
== 0)
5700 else if (tok
== '{')
5702 else if (tok
== '}') {
5703 if (parlevel
== 0 && parlevel1
== 0)
5710 /* currently, we always use constant expression for globals
5711 (may change for scripting case) */
5712 expr_type
= EXPR_CONST
;
5714 expr_type
= EXPR_ANY
;
5715 init_putv(type
, sec
, c
, 0, expr_type
);
5719 /* parse an initializer for type 't' if 'has_init' is non zero, and
5720 allocate space in local or global data space ('r' is either
5721 VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
5722 variable 'v' with an associated name represented by 'asm_label' of
5723 scope 'scope' is declared before initializers are parsed. If 'v' is
5724 zero, then a reference to the new object is put in the value stack.
5725 If 'has_init' is 2, a special parsing is done to handle string
5727 static void decl_initializer_alloc(CType
*type
, AttributeDef
*ad
, int r
,
5728 int has_init
, int v
, char *asm_label
,
5731 int size
, align
, addr
, data_offset
;
5733 ParseState saved_parse_state
= {0};
5734 TokenString init_str
;
5736 Sym
*flexible_array
;
5738 flexible_array
= NULL
;
5739 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
5740 Sym
*field
= type
->ref
->next
;
5743 field
= field
->next
;
5744 if (field
->type
.t
& VT_ARRAY
&& field
->type
.ref
->c
< 0)
5745 flexible_array
= field
;
5749 size
= type_size(type
, &align
);
5750 /* If unknown size, we must evaluate it before
5751 evaluating initializers because
5752 initializers can generate global data too
5753 (e.g. string pointers or ISOC99 compound
5754 literals). It also simplifies local
5755 initializers handling */
5756 tok_str_new(&init_str
);
5757 if (size
< 0 || (flexible_array
&& has_init
)) {
5759 tcc_error("unknown type size");
5760 /* get all init string */
5761 if (has_init
== 2) {
5762 /* only get strings */
5763 while (tok
== TOK_STR
|| tok
== TOK_LSTR
) {
5764 tok_str_add_tok(&init_str
);
5769 while (level
> 0 || (tok
!= ',' && tok
!= ';')) {
5771 tcc_error("unexpected end of file in initializer");
5772 tok_str_add_tok(&init_str
);
5775 else if (tok
== '}') {
5785 tok_str_add(&init_str
, -1);
5786 tok_str_add(&init_str
, 0);
5789 save_parse_state(&saved_parse_state
);
5791 begin_macro(&init_str
, 0);
5793 decl_initializer(type
, NULL
, 0, 1, 1);
5794 /* prepare second initializer parsing */
5795 macro_ptr
= init_str
.str
;
5798 /* if still unknown size, error */
5799 size
= type_size(type
, &align
);
5801 tcc_error("unknown type size");
5804 size
+= flexible_array
->type
.ref
->c
* pointed_size(&flexible_array
->type
);
5805 /* take into account specified alignment if bigger */
5806 if (ad
->a
.aligned
) {
5807 if (ad
->a
.aligned
> align
)
5808 align
= ad
->a
.aligned
;
5809 } else if (ad
->a
.packed
) {
5812 if ((r
& VT_VALMASK
) == VT_LOCAL
) {
5814 #ifdef CONFIG_TCC_BCHECK
5815 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5819 loc
= (loc
- size
) & -align
;
5821 #ifdef CONFIG_TCC_BCHECK
5822 /* handles bounds */
5823 /* XXX: currently, since we do only one pass, we cannot track
5824 '&' operators, so we add only arrays */
5825 if (tcc_state
->do_bounds_check
&& (type
->t
& VT_ARRAY
)) {
5827 /* add padding between regions */
5829 /* then add local bound info */
5830 bounds_ptr
= section_ptr_add(lbounds_section
, 2 * sizeof(addr_t
));
5831 bounds_ptr
[0] = addr
;
5832 bounds_ptr
[1] = size
;
5836 /* local variable */
5837 sym_push(v
, type
, r
, addr
);
5839 /* push local reference */
5840 vset(type
, r
, addr
);
5846 if (v
&& scope
== VT_CONST
) {
5847 /* see if the symbol was already defined */
5850 if (!is_compatible_types(&sym
->type
, type
))
5851 tcc_error("incompatible types for redefinition of '%s'",
5852 get_tok_str(v
, NULL
));
5853 if (sym
->type
.t
& VT_EXTERN
) {
5854 /* if the variable is extern, it was not allocated */
5855 sym
->type
.t
&= ~VT_EXTERN
;
5856 /* set array size if it was omitted in extern
5858 if ((sym
->type
.t
& VT_ARRAY
) &&
5859 sym
->type
.ref
->c
< 0 &&
5861 sym
->type
.ref
->c
= type
->ref
->c
;
5863 /* we accept several definitions of the same
5864 global variable. this is tricky, because we
5865 must play with the SHN_COMMON type of the symbol */
5866 /* XXX: should check if the variable was already
5867 initialized. It is incorrect to initialized it
5869 /* no init data, we won't add more to the symbol */
5876 /* allocate symbol in corresponding section */
5881 else if (tcc_state
->nocommon
)
5885 data_offset
= sec
->data_offset
;
5886 data_offset
= (data_offset
+ align
- 1) & -align
;
5888 /* very important to increment global pointer at this time
5889 because initializers themselves can create new initializers */
5890 data_offset
+= size
;
5891 #ifdef CONFIG_TCC_BCHECK
5892 /* add padding if bound check */
5893 if (tcc_state
->do_bounds_check
)
5896 sec
->data_offset
= data_offset
;
5897 /* allocate section space to put the data */
5898 if (sec
->sh_type
!= SHT_NOBITS
&&
5899 data_offset
> sec
->data_allocated
)
5900 section_realloc(sec
, data_offset
);
5901 /* align section if needed */
5902 if (align
> sec
->sh_addralign
)
5903 sec
->sh_addralign
= align
;
5905 addr
= 0; /* avoid warning */
5909 if (scope
!= VT_CONST
|| !sym
) {
5910 sym
= sym_push(v
, type
, r
| VT_SYM
, 0);
5911 sym
->asm_label
= asm_label
;
5913 /* update symbol definition */
5915 put_extern_sym(sym
, sec
, addr
, size
);
5918 /* put a common area */
5919 put_extern_sym(sym
, NULL
, align
, size
);
5920 /* XXX: find a nicer way */
5921 esym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
];
5922 esym
->st_shndx
= SHN_COMMON
;
5925 /* push global reference */
5926 sym
= get_sym_ref(type
, sec
, addr
, size
);
5927 vpushsym(type
, sym
);
5929 /* patch symbol weakness */
5930 if (type
->t
& VT_WEAK
)
5932 apply_visibility(sym
, type
);
5933 #ifdef CONFIG_TCC_BCHECK
5934 /* handles bounds now because the symbol must be defined
5935 before for the relocation */
5936 if (tcc_state
->do_bounds_check
) {
5939 greloc(bounds_section
, sym
, bounds_section
->data_offset
, R_DATA_PTR
);
5940 /* then add global bound info */
5941 bounds_ptr
= section_ptr_add(bounds_section
, 2 * sizeof(addr_t
));
5942 bounds_ptr
[0] = 0; /* relocated */
5943 bounds_ptr
[1] = size
;
5947 if (has_init
|| (type
->t
& VT_VLA
)) {
5948 decl_initializer(type
, sec
, addr
, 1, 0);
5949 /* restore parse state if needed */
5952 restore_parse_state(&saved_parse_state
);
5954 /* patch flexible array member size back to -1, */
5955 /* for possible subsequent similar declarations */
5957 flexible_array
->type
.ref
->c
= -1;
5962 static void put_func_debug(Sym
*sym
)
5967 /* XXX: we put here a dummy type */
5968 snprintf(buf
, sizeof(buf
), "%s:%c1",
5969 funcname
, sym
->type
.t
& VT_STATIC
? 'f' : 'F');
5970 put_stabs_r(buf
, N_FUN
, 0, file
->line_num
, 0,
5971 cur_text_section
, sym
->c
);
5972 /* //gr gdb wants a line at the function */
5973 put_stabn(N_SLINE
, 0, file
->line_num
, 0);
5978 /* parse an old style function declaration list */
5979 /* XXX: check multiple parameter */
5980 static void func_decl_list(Sym
*func_sym
)
5987 /* parse each declaration */
5988 while (tok
!= '{' && tok
!= ';' && tok
!= ',' && tok
!= TOK_EOF
&&
5989 tok
!= TOK_ASM1
&& tok
!= TOK_ASM2
&& tok
!= TOK_ASM3
) {
5990 if (!parse_btype(&btype
, &ad
))
5991 expect("declaration list");
5992 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
5993 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
5995 /* we accept no variable after */
5999 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
6000 /* find parameter in function parameter list */
6003 if ((s
->v
& ~SYM_FIELD
) == v
)
6007 tcc_error("declaration for parameter '%s' but no such parameter",
6008 get_tok_str(v
, NULL
));
6010 /* check that no storage specifier except 'register' was given */
6011 if (type
.t
& VT_STORAGE
)
6012 tcc_error("storage class specified for '%s'", get_tok_str(v
, NULL
));
6013 convert_parameter_type(&type
);
6014 /* we can add the type (NOTE: it could be local to the function) */
6016 /* accept other parameters */
6027 /* parse a function defined by symbol 'sym' and generate its code in
6028 'cur_text_section' */
6029 static void gen_function(Sym
*sym
)
6031 int saved_nocode_wanted
= nocode_wanted
;
6034 ind
= cur_text_section
->data_offset
;
6035 /* NOTE: we patch the symbol size later */
6036 put_extern_sym(sym
, cur_text_section
, ind
, 0);
6037 funcname
= get_tok_str(sym
->v
, NULL
);
6039 /* Initialize VLA state */
6041 vla_sp_root_loc
= -1;
6042 /* put debug symbol */
6043 if (tcc_state
->do_debug
)
6044 put_func_debug(sym
);
6045 /* push a dummy symbol to enable local sym storage */
6046 sym_push2(&local_stack
, SYM_FIELD
, 0, 0);
6047 gfunc_prolog(&sym
->type
);
6048 #ifdef CONFIG_TCC_BCHECK
6049 if (tcc_state
->do_bounds_check
&& !strcmp(funcname
, "main")) {
6052 for (i
= 0, sym
= local_stack
; i
< 2; i
++, sym
= sym
->prev
) {
6053 if (sym
->v
& SYM_FIELD
|| sym
->prev
->v
& SYM_FIELD
)
6055 vpush_global_sym(&func_old_type
, TOK___bound_main_arg
);
6056 vset(&sym
->type
, sym
->r
, sym
->c
);
6062 block(NULL
, NULL
, NULL
, NULL
, 0, 0);
6065 cur_text_section
->data_offset
= ind
;
6066 label_pop(&global_label_stack
, NULL
);
6067 /* reset local stack */
6068 scope_stack_bottom
= NULL
;
6069 sym_pop(&local_stack
, NULL
);
6070 /* end of function */
6071 /* patch symbol size */
6072 ((ElfW(Sym
) *)symtab_section
->data
)[sym
->c
].st_size
=
6074 /* patch symbol weakness (this definition overrules any prototype) */
6075 if (sym
->type
.t
& VT_WEAK
)
6077 apply_visibility(sym
, &sym
->type
);
6078 if (tcc_state
->do_debug
) {
6079 put_stabn(N_FUN
, 0, 0, ind
- func_ind
);
6081 /* It's better to crash than to generate wrong code */
6082 cur_text_section
= NULL
;
6083 funcname
= ""; /* for safety */
6084 func_vt
.t
= VT_VOID
; /* for safety */
6085 func_var
= 0; /* for safety */
6086 ind
= 0; /* for safety */
6087 nocode_wanted
= saved_nocode_wanted
;
6091 ST_FUNC
void gen_inline_functions(void)
6094 int inline_generated
, i
, ln
;
6095 struct InlineFunc
*fn
;
6097 ln
= file
->line_num
;
6098 /* iterate while inline function are referenced */
6100 inline_generated
= 0;
6101 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
6102 fn
= tcc_state
->inline_fns
[i
];
6104 if (sym
&& sym
->c
) {
6105 /* the function was used: generate its code and
6106 convert it to a normal function */
6109 pstrcpy(file
->filename
, sizeof file
->filename
, fn
->filename
);
6110 sym
->r
= VT_SYM
| VT_CONST
;
6111 sym
->type
.t
&= ~VT_INLINE
;
6113 begin_macro(&fn
->func_str
, 0);
6115 cur_text_section
= text_section
;
6119 inline_generated
= 1;
6122 if (!inline_generated
)
6125 file
->line_num
= ln
;
6126 /* free tokens of unused inline functions */
6127 for (i
= 0; i
< tcc_state
->nb_inline_fns
; ++i
) {
6128 fn
= tcc_state
->inline_fns
[i
];
6130 tok_str_free(fn
->func_str
.str
);
6132 dynarray_reset(&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
);
6135 /* 'l' is VT_LOCAL or VT_CONST to define default storage type */
6136 static int decl0(int l
, int is_for_loop_init
)
6144 if (!parse_btype(&btype
, &ad
)) {
6145 if (is_for_loop_init
)
6147 /* skip redundant ';' */
6148 /* XXX: find more elegant solution */
6153 if (l
== VT_CONST
&&
6154 (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
6155 /* global asm block */
6159 /* special test for old K&R protos without explicit int
6160 type. Only accepted when defining global data */
6161 if (l
== VT_LOCAL
|| tok
< TOK_DEFINE
)
6165 if (((btype
.t
& VT_BTYPE
) == VT_ENUM
||
6166 (btype
.t
& VT_BTYPE
) == VT_STRUCT
) &&
6168 if ((btype
.t
& VT_BTYPE
) == VT_STRUCT
) {
6169 int v
= btype
.ref
->v
;
6170 if (!(v
& SYM_FIELD
) && (v
& ~SYM_STRUCT
) >= SYM_FIRST_ANOM
)
6171 tcc_warning("unnamed struct/union that defines no instances");
6176 while (1) { /* iterate thru each declaration */
6177 char *asm_label
; // associated asm label
6179 type_decl(&type
, &ad
, &v
, TYPE_DIRECT
);
6183 type_to_str(buf
, sizeof(buf
), t
, get_tok_str(v
, NULL
));
6184 printf("type = '%s'\n", buf
);
6187 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
6188 if ((type
.t
& VT_STATIC
) && (l
== VT_LOCAL
)) {
6189 tcc_error("function without file scope cannot be static");
6191 /* if old style function prototype, we accept a
6194 if (sym
->c
== FUNC_OLD
)
6195 func_decl_list(sym
);
6199 if (gnu_ext
&& (tok
== TOK_ASM1
|| tok
== TOK_ASM2
|| tok
== TOK_ASM3
)) {
6202 asm_label_instr(&astr
);
6203 asm_label
= tcc_strdup(astr
.data
);
6206 /* parse one last attribute list, after asm label */
6207 parse_attribute(&ad
);
6212 #ifdef TCC_TARGET_PE
6213 if (ad
.a
.func_import
)
6214 type
.t
|= VT_IMPORT
;
6215 if (ad
.a
.func_export
)
6216 type
.t
|= VT_EXPORT
;
6218 type
.t
|= ad
.a
.visibility
<< VT_VIS_SHIFT
;
6222 tcc_error("cannot use local functions");
6223 if ((type
.t
& VT_BTYPE
) != VT_FUNC
)
6224 expect("function definition");
6226 /* reject abstract declarators in function definition */
6228 while ((sym
= sym
->next
) != NULL
)
6229 if (!(sym
->v
& ~SYM_FIELD
))
6230 expect("identifier");
6232 /* XXX: cannot do better now: convert extern line to static inline */
6233 if ((type
.t
& (VT_EXTERN
| VT_INLINE
)) == (VT_EXTERN
| VT_INLINE
))
6234 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
6239 if ((sym
->type
.t
& VT_BTYPE
) != VT_FUNC
)
6242 ref
= sym
->type
.ref
;
6243 if (0 == ref
->a
.func_proto
)
6244 tcc_error("redefinition of '%s'", get_tok_str(v
, NULL
));
6246 /* use func_call from prototype if not defined */
6247 if (ref
->a
.func_call
!= FUNC_CDECL
6248 && type
.ref
->a
.func_call
== FUNC_CDECL
)
6249 type
.ref
->a
.func_call
= ref
->a
.func_call
;
6251 /* use export from prototype */
6252 if (ref
->a
.func_export
)
6253 type
.ref
->a
.func_export
= 1;
6255 /* use static from prototype */
6256 if (sym
->type
.t
& VT_STATIC
)
6257 type
.t
= (type
.t
& ~VT_EXTERN
) | VT_STATIC
;
6259 /* If the definition has no visibility use the
6260 one from prototype. */
6261 if (! (type
.t
& VT_VIS_MASK
))
6262 type
.t
|= sym
->type
.t
& VT_VIS_MASK
;
6264 if (!is_compatible_types(&sym
->type
, &type
)) {
6266 tcc_error("incompatible types for redefinition of '%s'",
6267 get_tok_str(v
, NULL
));
6269 type
.ref
->a
.func_proto
= 0;
6270 /* if symbol is already defined, then put complete type */
6273 /* put function symbol */
6274 sym
= global_identifier_push(v
, type
.t
, 0);
6275 sym
->type
.ref
= type
.ref
;
6278 /* static inline functions are just recorded as a kind
6279 of macro. Their code will be emitted at the end of
6280 the compilation unit only if they are used */
6281 if ((type
.t
& (VT_INLINE
| VT_STATIC
)) ==
6282 (VT_INLINE
| VT_STATIC
)) {
6284 struct InlineFunc
*fn
;
6285 const char *filename
;
6287 filename
= file
? file
->filename
: "";
6288 fn
= tcc_malloc(sizeof *fn
+ strlen(filename
));
6289 strcpy(fn
->filename
, filename
);
6291 tok_str_new(&fn
->func_str
);
6297 tcc_error("unexpected end of file");
6298 tok_str_add_tok(&fn
->func_str
);
6303 } else if (t
== '}') {
6305 if (block_level
== 0)
6309 tok_str_add(&fn
->func_str
, -1);
6310 tok_str_add(&fn
->func_str
, 0);
6311 dynarray_add((void ***)&tcc_state
->inline_fns
, &tcc_state
->nb_inline_fns
, fn
);
6314 /* compute text section */
6315 cur_text_section
= ad
.section
;
6316 if (!cur_text_section
)
6317 cur_text_section
= text_section
;
6318 sym
->r
= VT_SYM
| VT_CONST
;
6323 if (btype
.t
& VT_TYPEDEF
) {
6324 /* save typedefed type */
6325 /* XXX: test storage specifiers ? */
6326 sym
= sym_push(v
, &type
, 0, 0);
6328 sym
->type
.t
|= VT_TYPEDEF
;
6331 if ((type
.t
& VT_BTYPE
) == VT_FUNC
) {
6332 /* external function definition */
6333 /* specific case for func_call attribute */
6334 ad
.a
.func_proto
= 1;
6336 } else if (!(type
.t
& VT_ARRAY
)) {
6337 /* not lvalue if array */
6338 r
|= lvalue_type(type
.t
);
6340 has_init
= (tok
== '=');
6341 if (has_init
&& (type
.t
& VT_VLA
))
6342 tcc_error("Variable length array cannot be initialized");
6343 if ((btype
.t
& VT_EXTERN
) || ((type
.t
& VT_BTYPE
) == VT_FUNC
) ||
6344 ((type
.t
& VT_ARRAY
) && (type
.t
& VT_STATIC
) &&
6345 !has_init
&& l
== VT_CONST
&& type
.ref
->c
< 0)) {
6346 /* external variable or function */
6347 /* NOTE: as GCC, uninitialized global static
6348 arrays of null size are considered as
6350 sym
= external_sym(v
, &type
, r
, asm_label
);
6352 if (ad
.alias_target
) {
6357 alias_target
= sym_find(ad
.alias_target
);
6358 if (!alias_target
|| !alias_target
->c
)
6359 tcc_error("unsupported forward __alias__ attribute");
6360 esym
= &((Elf32_Sym
*)symtab_section
->data
)[alias_target
->c
];
6361 tsec
.sh_num
= esym
->st_shndx
;
6362 put_extern_sym2(sym
, &tsec
, esym
->st_value
, esym
->st_size
, 0);
6365 type
.t
|= (btype
.t
& VT_STATIC
); /* Retain "static". */
6366 if (type
.t
& VT_STATIC
)
6372 decl_initializer_alloc(&type
, &ad
, r
, has_init
, v
, asm_label
, l
);
6376 if (is_for_loop_init
)
6389 ST_FUNC
void decl(int l
)