2 * X86 code generator for TCC
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
21 #ifdef TARGET_DEFS_ONLY
23 /* number of available registers */
26 #define CONFIG_TCC_ASM
28 /* a register can belong to several classes. The classes must be
29 sorted from more general to more precise (see gv2() code which does
30 assumptions on it). */
31 #define RC_INT 0x0001 /* generic integer register */
32 #define RC_FLOAT 0x0002 /* generic float register */
39 #define RC_IRET RC_EAX /* function return: integer register */
40 #define RC_LRET RC_EDX /* function return: second integer register */
41 #define RC_FRET RC_ST0 /* function return: float register */
43 /* pretty names for the registers */
53 /* return registers for function */
54 #define REG_IRET TREG_EAX /* single word int return register */
55 #define REG_LRET TREG_EDX /* second word return register (for long long) */
56 #define REG_FRET TREG_ST0 /* float return register */
58 /* defined if function parameters must be evaluated in reverse order */
59 #define INVERT_FUNC_PARAMS
61 /* defined if structures are passed as pointers. Otherwise structures
62 are directly pushed on stack. */
63 /* #define FUNC_STRUCT_PARAM_AS_PTR */
65 /* pointer size, in bytes */
68 /* long double size and alignment, in bytes */
69 #define LDOUBLE_SIZE 12
70 #define LDOUBLE_ALIGN 4
71 /* maximum alignment (for aligned attribute support) */
74 /******************************************************/
75 #else /* ! TARGET_DEFS_ONLY */
76 /******************************************************/
79 /* define to 1/0 to [not] have EBX as 4th register */
82 ST_DATA
const int reg_classes
[NB_REGS
] = {
83 /* eax */ RC_INT
| RC_EAX
,
84 /* ecx */ RC_INT
| RC_ECX
,
85 /* edx */ RC_INT
| RC_EDX
,
86 /* ebx */ (RC_INT
| RC_EBX
) * USE_EBX
,
87 /* st0 */ RC_FLOAT
| RC_ST0
,
90 static unsigned long func_sub_sp_offset
;
91 static int func_ret_sub
;
92 #ifdef CONFIG_TCC_BCHECK
93 static addr_t func_bound_offset
;
94 static unsigned long func_bound_ind
;
97 /* XXX: make it faster ? */
104 if (ind1
> cur_text_section
->data_allocated
)
105 section_realloc(cur_text_section
, ind1
);
106 cur_text_section
->data
[ind
] = c
;
110 ST_FUNC
void o(unsigned int c
)
118 ST_FUNC
void gen_le16(int v
)
124 ST_FUNC
void gen_le32(int c
)
132 /* output a symbol and patch all calls to it */
133 ST_FUNC
void gsym_addr(int t
, int a
)
136 unsigned char *ptr
= cur_text_section
->data
+ t
;
137 uint32_t n
= read32le(ptr
); /* next value */
138 write32le(ptr
, a
- t
- 4);
143 /* instruction + 4 bytes data. Return the address of the data */
144 static int oad(int c
, int s
)
155 ST_FUNC
void gen_fill_nops(int bytes
)
161 /* generate jmp to a label */
162 #define gjmp2(instr,lbl) oad(instr,lbl)
164 /* output constant with relocation if 'r & VT_SYM' is true */
165 ST_FUNC
void gen_addr32(int r
, Sym
*sym
, int c
)
168 greloc(cur_text_section
, sym
, ind
, R_386_32
);
172 ST_FUNC
void gen_addrpc32(int r
, Sym
*sym
, int c
)
175 greloc(cur_text_section
, sym
, ind
, R_386_PC32
);
179 /* generate a modrm reference. 'op_reg' contains the additional 3
181 static void gen_modrm(int op_reg
, int r
, Sym
*sym
, int c
)
183 op_reg
= op_reg
<< 3;
184 if ((r
& VT_VALMASK
) == VT_CONST
) {
185 /* constant memory reference */
187 gen_addr32(r
, sym
, c
);
188 } else if ((r
& VT_VALMASK
) == VT_LOCAL
) {
189 /* currently, we use only ebp as base */
191 /* short reference */
195 oad(0x85 | op_reg
, c
);
198 g(0x00 | op_reg
| (r
& VT_VALMASK
));
202 /* load 'r' from value 'sv' */
203 ST_FUNC
void load(int r
, SValue
*sv
)
205 int v
, t
, ft
, fc
, fr
;
210 sv
= pe_getimport(sv
, &v2
);
214 ft
= sv
->type
.t
& ~VT_DEFSIGN
;
217 ft
&= ~(VT_VOLATILE
| VT_CONSTANT
);
221 if (v
== VT_LLOCAL
) {
223 v1
.r
= VT_LOCAL
| VT_LVAL
;
226 if (!(reg_classes
[fr
] & RC_INT
))
227 fr
= get_reg(RC_INT
);
230 if ((ft
& VT_BTYPE
) == VT_FLOAT
) {
233 } else if ((ft
& VT_BTYPE
) == VT_DOUBLE
) {
236 } else if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
239 } else if ((ft
& VT_TYPE
) == VT_BYTE
|| (ft
& VT_TYPE
) == VT_BOOL
) {
240 o(0xbe0f); /* movsbl */
241 } else if ((ft
& VT_TYPE
) == (VT_BYTE
| VT_UNSIGNED
)) {
242 o(0xb60f); /* movzbl */
243 } else if ((ft
& VT_TYPE
) == VT_SHORT
) {
244 o(0xbf0f); /* movswl */
245 } else if ((ft
& VT_TYPE
) == (VT_SHORT
| VT_UNSIGNED
)) {
246 o(0xb70f); /* movzwl */
250 gen_modrm(r
, fr
, sv
->sym
, fc
);
253 o(0xb8 + r
); /* mov $xx, r */
254 gen_addr32(fr
, sv
->sym
, fc
);
255 } else if (v
== VT_LOCAL
) {
257 o(0x8d); /* lea xxx(%ebp), r */
258 gen_modrm(r
, VT_LOCAL
, sv
->sym
, fc
);
261 o(0xe8 + r
); /* mov %ebp, r */
263 } else if (v
== VT_CMP
) {
264 o(0x0f); /* setxx %br */
267 o(0xc0b60f + r
* 0x90000); /* movzbl %al, %eax */
268 } else if (v
== VT_JMP
|| v
== VT_JMPI
) {
270 oad(0xb8 + r
, t
); /* mov $1, r */
271 o(0x05eb); /* jmp after */
273 oad(0xb8 + r
, t
^ 1); /* mov $0, r */
276 o(0xc0 + r
+ v
* 8); /* mov v, r */
281 /* store register 'r' in lvalue 'v' */
282 ST_FUNC
void store(int r
, SValue
*v
)
288 v
= pe_getimport(v
, &v2
);
293 fr
= v
->r
& VT_VALMASK
;
294 ft
&= ~(VT_VOLATILE
| VT_CONSTANT
);
296 /* XXX: incorrect if float reg to reg */
297 if (bt
== VT_FLOAT
) {
300 } else if (bt
== VT_DOUBLE
) {
303 } else if (bt
== VT_LDOUBLE
) {
304 o(0xc0d9); /* fld %st(0) */
310 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
315 if (fr
== VT_CONST
||
318 gen_modrm(r
, v
->r
, v
->sym
, fc
);
319 } else if (fr
!= r
) {
320 o(0xc0 + fr
+ r
* 8); /* mov r, fr */
324 static void gadd_sp(int val
)
326 if (val
== (char)val
) {
330 oad(0xc481, val
); /* add $xxx, %esp */
334 #if defined CONFIG_TCC_BCHECK || defined TCC_TARGET_PE
335 static void gen_static_call(int v
)
339 sym
= external_global_sym(v
, &func_old_type
);
341 greloc(cur_text_section
, sym
, ind
-4, R_386_PC32
);
345 /* 'is_jmp' is '1' if it is a jump */
346 static void gcall_or_jmp(int is_jmp
)
349 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
&& (vtop
->r
& VT_SYM
)) {
350 /* constant and relocation case */
351 greloc(cur_text_section
, vtop
->sym
, ind
+ 1, R_386_PC32
);
352 oad(0xe8 + is_jmp
, vtop
->c
.i
- 4); /* call/jmp im */
354 /* otherwise, indirect call */
356 o(0xff); /* call/jmp *r */
357 o(0xd0 + r
+ (is_jmp
<< 4));
361 /* extend the return value to the whole register if necessary
362 visual studio and gcc do not always set the whole eax register
363 when assigning the return value of a function */
364 rt
= vtop
->type
.ref
->type
.t
;
365 switch (rt
& VT_BTYPE
) {
368 if (rt
& VT_UNSIGNED
) {
369 o(0xc0b60f); /* movzx %al, %eax */
372 o(0xc0be0f); /* movsx %al, %eax */
376 if (rt
& VT_UNSIGNED
) {
377 o(0xc0b70f); /* movzx %ax, %eax */
380 o(0xc0bf0f); /* movsx %ax, %eax */
389 static uint8_t fastcall_regs
[3] = { TREG_EAX
, TREG_EDX
, TREG_ECX
};
390 static uint8_t fastcallw_regs
[2] = { TREG_ECX
, TREG_EDX
};
392 /* Return the number of registers needed to return the struct, or 0 if
393 returning via struct pointer. */
394 ST_FUNC
int gfunc_sret(CType
*vt
, int variadic
, CType
*ret
, int *ret_align
, int *regsize
)
398 *ret_align
= 1; // Never have to re-align return values for x86
400 size
= type_size(vt
, &align
);
401 if (size
> 8 || (size
& (size
- 1)))
414 *ret_align
= 1; // Never have to re-align return values for x86
419 /* Generate function call. The function address is pushed first, then
420 all the parameters in call order. This functions pops all the
421 parameters and the function address. */
422 ST_FUNC
void gfunc_call(int nb_args
)
424 int size
, align
, r
, args_size
, i
, func_call
;
428 for(i
= 0;i
< nb_args
; i
++) {
429 if ((vtop
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
430 size
= type_size(&vtop
->type
, &align
);
431 /* align to stack align size */
432 size
= (size
+ 3) & ~3;
433 /* allocate the necessary size on stack */
434 oad(0xec81, size
); /* sub $xxx, %esp */
435 /* generate structure store */
437 o(0x89); /* mov %esp, r */
439 vset(&vtop
->type
, r
| VT_LVAL
, 0);
443 } else if (is_float(vtop
->type
.t
)) {
444 gv(RC_FLOAT
); /* only one float register */
445 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
)
447 else if ((vtop
->type
.t
& VT_BTYPE
) == VT_DOUBLE
)
451 oad(0xec81, size
); /* sub $xxx, %esp */
455 o(0x5cd9 + size
- 4); /* fstp[s|l] 0(%esp) */
460 /* simple type (currently always same size) */
461 /* XXX: implicit cast ? */
463 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
465 o(0x50 + vtop
->r2
); /* push r */
469 o(0x50 + r
); /* push r */
474 save_regs(0); /* save used temporary registers */
475 func_sym
= vtop
->type
.ref
;
476 func_call
= func_sym
->f
.func_call
;
478 if ((func_call
>= FUNC_FASTCALL1
&& func_call
<= FUNC_FASTCALL3
) ||
479 func_call
== FUNC_FASTCALLW
) {
480 int fastcall_nb_regs
;
481 uint8_t *fastcall_regs_ptr
;
482 if (func_call
== FUNC_FASTCALLW
) {
483 fastcall_regs_ptr
= fastcallw_regs
;
484 fastcall_nb_regs
= 2;
486 fastcall_regs_ptr
= fastcall_regs
;
487 fastcall_nb_regs
= func_call
- FUNC_FASTCALL1
+ 1;
489 for(i
= 0;i
< fastcall_nb_regs
; i
++) {
492 o(0x58 + fastcall_regs_ptr
[i
]); /* pop r */
493 /* XXX: incorrect for struct/floats */
497 #ifndef TCC_TARGET_PE
498 else if ((vtop
->type
.ref
->type
.t
& VT_BTYPE
) == VT_STRUCT
)
503 if (args_size
&& func_call
!= FUNC_STDCALL
&& func_call
!= FUNC_FASTCALLW
)
509 #define FUNC_PROLOG_SIZE (10 + USE_EBX)
511 #define FUNC_PROLOG_SIZE (9 + USE_EBX)
514 /* generate function prolog of type 't' */
515 ST_FUNC
void gfunc_prolog(CType
*func_type
)
517 int addr
, align
, size
, func_call
, fastcall_nb_regs
;
518 int param_index
, param_addr
;
519 uint8_t *fastcall_regs_ptr
;
523 sym
= func_type
->ref
;
524 func_call
= sym
->f
.func_call
;
529 if (func_call
>= FUNC_FASTCALL1
&& func_call
<= FUNC_FASTCALL3
) {
530 fastcall_nb_regs
= func_call
- FUNC_FASTCALL1
+ 1;
531 fastcall_regs_ptr
= fastcall_regs
;
532 } else if (func_call
== FUNC_FASTCALLW
) {
533 fastcall_nb_regs
= 2;
534 fastcall_regs_ptr
= fastcallw_regs
;
536 fastcall_nb_regs
= 0;
537 fastcall_regs_ptr
= NULL
;
541 ind
+= FUNC_PROLOG_SIZE
;
542 func_sub_sp_offset
= ind
;
543 /* if the function returns a structure, then add an
544 implicit pointer parameter */
546 func_var
= (sym
->f
.func_type
== FUNC_ELLIPSIS
);
548 size
= type_size(&func_vt
,&align
);
549 if (((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
)
550 && (size
> 8 || (size
& (size
- 1)))) {
552 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
554 /* XXX: fastcall case ? */
559 /* define parameters */
560 while ((sym
= sym
->next
) != NULL
) {
562 size
= type_size(type
, &align
);
563 size
= (size
+ 3) & ~3;
564 #ifdef FUNC_STRUCT_PARAM_AS_PTR
565 /* structs are passed as pointer */
566 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
570 if (param_index
< fastcall_nb_regs
) {
571 /* save FASTCALL register */
574 gen_modrm(fastcall_regs_ptr
[param_index
], VT_LOCAL
, NULL
, loc
);
580 sym_push(sym
->v
& ~SYM_FIELD
, type
,
581 VT_LOCAL
| lvalue_type(type
->t
), param_addr
);
585 /* pascal type call or fastcall ? */
586 if (func_call
== FUNC_STDCALL
|| func_call
== FUNC_FASTCALLW
)
587 func_ret_sub
= addr
- 8;
588 #ifndef TCC_TARGET_PE
593 #ifdef CONFIG_TCC_BCHECK
594 /* leave some room for bound checking code */
595 if (tcc_state
->do_bounds_check
) {
596 func_bound_offset
= lbounds_section
->data_offset
;
597 func_bound_ind
= ind
;
598 oad(0xb8, 0); /* lbound section pointer */
599 oad(0xb8, 0); /* call to function */
604 /* generate function epilog */
605 ST_FUNC
void gfunc_epilog(void)
609 #ifdef CONFIG_TCC_BCHECK
610 if (tcc_state
->do_bounds_check
611 && func_bound_offset
!= lbounds_section
->data_offset
) {
616 /* add end of table info */
617 bounds_ptr
= section_ptr_add(lbounds_section
, sizeof(addr_t
));
620 /* generate bound local allocation */
622 ind
= func_bound_ind
;
623 sym_data
= get_sym_ref(&char_pointer_type
, lbounds_section
,
624 func_bound_offset
, lbounds_section
->data_offset
);
625 greloc(cur_text_section
, sym_data
,
627 oad(0xb8, 0); /* mov %eax, xxx */
628 gen_static_call(TOK___bound_local_new
);
631 /* generate bound check local freeing */
632 o(0x5250); /* save returned value, if any */
633 greloc(cur_text_section
, sym_data
, ind
+ 1, R_386_32
);
634 oad(0xb8, 0); /* mov %eax, xxx */
635 gen_static_call(TOK___bound_local_delete
);
636 o(0x585a); /* restore returned value, if any */
640 /* align local size to word & save local variables */
645 gen_modrm(TREG_EBX
, VT_LOCAL
, NULL
, -(v
+4));
649 if (func_ret_sub
== 0) {
654 g(func_ret_sub
>> 8);
657 ind
= func_sub_sp_offset
- FUNC_PROLOG_SIZE
;
660 oad(0xb8, v
); /* mov stacksize, %eax */
661 gen_static_call(TOK___chkstk
); /* call __chkstk, (does the stackframe too) */
665 o(0xe58955); /* push %ebp, mov %esp, %ebp */
666 o(0xec81); /* sub esp, stacksize */
669 o(0x90); /* adjust to FUNC_PROLOG_SIZE */
672 o(0x53 * USE_EBX
); /* push ebx */
676 /* generate a jump to a label */
677 ST_FUNC
int gjmp(int t
)
679 return gjmp2(0xe9, t
);
682 /* generate a jump to a fixed address */
683 ST_FUNC
void gjmp_addr(int a
)
691 oad(0xe9, a
- ind
- 5);
696 /* generate a jump to a fixed address */
697 ST_FUNC
void gjmp_cond_addr(int a
, int op
)
703 g(0x0f), gjmp2(op
- 16, r
- 4);
707 ST_FUNC
int gjmp_append(int n
, int t
)
710 /* insert vtop->c jump list in t */
713 while ((n2
= read32le(p
= cur_text_section
->data
+ n1
)))
721 ST_FUNC
int gjmp_cond(int op
, int t
)
724 t
= gjmp2(op
- 16, t
);
728 ST_FUNC
void gen_opi(int op
)
734 case TOK_ADDC1
: /* add with carry generation */
737 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
744 /* generate inc and dec for smaller code */
745 if ((c
== 1 || c
== -1) && (op
== '+' || op
== '-')) {
746 opc
= (c
== 1) ^ (op
== '+');
747 o (0x40 | (opc
<< 3) | r
); // inc,dec
750 o(0xc0 | (opc
<< 3) | r
);
755 oad(0xc0 | (opc
<< 3) | r
, c
);
761 o((opc
<< 3) | 0x01);
762 o(0xc0 + r
+ fr
* 8);
765 if (op
>= TOK_ULT
&& op
<= TOK_GT
)
769 case TOK_SUBC1
: /* sub with carry generation */
772 case TOK_ADDC2
: /* add with carry use */
775 case TOK_SUBC2
: /* sub with carry use */
792 o(0xaf0f); /* imul fr, r */
793 o(0xc0 + fr
+ r
* 8);
804 opc
= 0xc0 | (opc
<< 3);
805 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
810 c
= vtop
->c
.i
& 0x1f;
811 o(0xc1); /* shl/shr/sar $xxx, r */
815 /* we generate the shift in ecx */
818 o(0xd3); /* shl/shr/sar %cl, r */
829 /* first operand must be in eax */
830 /* XXX: need better constraint for second operand */
836 /* save EAX too if used otherwise */
837 save_reg_upstack(TREG_EAX
, 1);
838 if (op
== TOK_UMULL
) {
839 o(0xf7); /* mul fr */
844 if (op
== TOK_UDIV
|| op
== TOK_UMOD
) {
845 o(0xf7d231); /* xor %edx, %edx, div fr, %eax */
848 o(0xf799); /* cltd, idiv fr, %eax */
851 if (op
== '%' || op
== TOK_UMOD
)
864 /* generate a floating point operation 'v = t1 op t2' instruction. The
865 two operands are guaranteed to have the same floating point type */
866 /* XXX: need to use ST1 too */
867 ST_FUNC
void gen_opf(int op
)
869 int a
, ft
, fc
, swapped
, r
;
871 /* convert constants to memory references */
872 if ((vtop
[-1].r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
877 if ((vtop
[0].r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
)
880 /* must put at least one value in the floating point register */
881 if ((vtop
[-1].r
& VT_LVAL
) &&
882 (vtop
[0].r
& VT_LVAL
)) {
888 /* swap the stack if needed so that t1 is the register and t2 is
889 the memory reference */
890 if (vtop
[-1].r
& VT_LVAL
) {
894 if (op
>= TOK_ULT
&& op
<= TOK_GT
) {
895 /* load on stack second operand */
896 load(TREG_ST0
, vtop
);
897 save_reg(TREG_EAX
); /* eax is used by FP comparison code */
898 if (op
== TOK_GE
|| op
== TOK_GT
)
900 else if (op
== TOK_EQ
|| op
== TOK_NE
)
903 o(0xc9d9); /* fxch %st(1) */
904 if (op
== TOK_EQ
|| op
== TOK_NE
)
905 o(0xe9da); /* fucompp */
907 o(0xd9de); /* fcompp */
908 o(0xe0df); /* fnstsw %ax */
910 o(0x45e480); /* and $0x45, %ah */
911 o(0x40fC80); /* cmp $0x40, %ah */
912 } else if (op
== TOK_NE
) {
913 o(0x45e480); /* and $0x45, %ah */
914 o(0x40f480); /* xor $0x40, %ah */
916 } else if (op
== TOK_GE
|| op
== TOK_LE
) {
917 o(0x05c4f6); /* test $0x05, %ah */
920 o(0x45c4f6); /* test $0x45, %ah */
926 /* no memory reference possible for long double operations */
927 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
928 load(TREG_ST0
, vtop
);
953 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
954 o(0xde); /* fxxxp %st, %st(1) */
957 /* if saved lvalue, then we must reload it */
959 if ((r
& VT_VALMASK
) == VT_LLOCAL
) {
963 v1
.r
= VT_LOCAL
| VT_LVAL
;
969 if ((ft
& VT_BTYPE
) == VT_DOUBLE
)
973 gen_modrm(a
, r
, vtop
->sym
, fc
);
979 /* convert integers to fp 't' type. Must handle 'int', 'unsigned int'
980 and 'long long' cases. */
981 ST_FUNC
void gen_cvt_itof(int t
)
985 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
986 /* signed long long to float/double/long double (unsigned case
987 is handled generically) */
988 o(0x50 + vtop
->r2
); /* push r2 */
989 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
990 o(0x242cdf); /* fildll (%esp) */
991 o(0x08c483); /* add $8, %esp */
992 } else if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
993 (VT_INT
| VT_UNSIGNED
)) {
994 /* unsigned int to float/double/long double */
995 o(0x6a); /* push $0 */
997 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
998 o(0x242cdf); /* fildll (%esp) */
999 o(0x08c483); /* add $8, %esp */
1001 /* int to float/double/long double */
1002 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
1003 o(0x2404db); /* fildl (%esp) */
1004 o(0x04c483); /* add $4, %esp */
1009 /* convert fp to int 't' type */
1010 ST_FUNC
void gen_cvt_ftoi(int t
)
1012 int bt
= vtop
->type
.t
& VT_BTYPE
;
1014 vpush_global_sym(&func_old_type
, TOK___fixsfdi
);
1015 else if (bt
== VT_LDOUBLE
)
1016 vpush_global_sym(&func_old_type
, TOK___fixxfdi
);
1018 vpush_global_sym(&func_old_type
, TOK___fixdfdi
);
1023 vtop
->r2
= REG_LRET
;
1026 /* convert from one floating point type to another */
1027 ST_FUNC
void gen_cvt_ftof(int t
)
1029 /* all we have to do on i386 is to put the float in a register */
1033 /* computed goto support */
1034 ST_FUNC
void ggoto(void)
1040 /* bound check support functions */
1041 #ifdef CONFIG_TCC_BCHECK
1043 /* generate a bounded pointer addition */
1044 ST_FUNC
void gen_bounded_ptr_add(void)
1046 /* prepare fast i386 function call (args in eax and edx) */
1047 gv2(RC_EAX
, RC_EDX
);
1048 /* save all temporary registers */
1051 /* do a fast function call */
1052 gen_static_call(TOK___bound_ptr_add
);
1053 /* returned pointer is in eax */
1055 vtop
->r
= TREG_EAX
| VT_BOUNDED
;
1056 /* address of bounding function call point */
1057 vtop
->c
.i
= (cur_text_section
->reloc
->data_offset
- sizeof(Elf32_Rel
));
1060 /* patch pointer addition in vtop so that pointer dereferencing is
1062 ST_FUNC
void gen_bounded_ptr_deref(void)
1070 /* XXX: put that code in generic part of tcc */
1071 if (!is_float(vtop
->type
.t
)) {
1072 if (vtop
->r
& VT_LVAL_BYTE
)
1074 else if (vtop
->r
& VT_LVAL_SHORT
)
1078 size
= type_size(&vtop
->type
, &align
);
1080 case 1: func
= TOK___bound_ptr_indir1
; break;
1081 case 2: func
= TOK___bound_ptr_indir2
; break;
1082 case 4: func
= TOK___bound_ptr_indir4
; break;
1083 case 8: func
= TOK___bound_ptr_indir8
; break;
1084 case 12: func
= TOK___bound_ptr_indir12
; break;
1085 case 16: func
= TOK___bound_ptr_indir16
; break;
1087 tcc_error("unhandled size when dereferencing bounded pointer");
1092 /* patch relocation */
1093 /* XXX: find a better solution ? */
1094 rel
= (Elf32_Rel
*)(cur_text_section
->reloc
->data
+ vtop
->c
.i
);
1095 sym
= external_global_sym(func
, &func_old_type
);
1097 put_extern_sym(sym
, NULL
, 0, 0);
1098 rel
->r_info
= ELF32_R_INFO(sym
->c
, ELF32_R_TYPE(rel
->r_info
));
1102 /* Save the stack pointer onto the stack */
1103 ST_FUNC
void gen_vla_sp_save(int addr
) {
1104 /* mov %esp,addr(%ebp)*/
1106 gen_modrm(TREG_ESP
, VT_LOCAL
, NULL
, addr
);
1109 /* Restore the SP from a location on the stack */
1110 ST_FUNC
void gen_vla_sp_restore(int addr
) {
1112 gen_modrm(TREG_ESP
, VT_LOCAL
, NULL
, addr
);
1115 /* Subtract from the stack pointer, and push the resulting value onto the stack */
1116 ST_FUNC
void gen_vla_alloc(CType
*type
, int align
) {
1117 #ifdef TCC_TARGET_PE
1118 /* alloca does more than just adjust %rsp on Windows */
1119 vpush_global_sym(&func_old_type
, TOK_alloca
);
1120 vswap(); /* Move alloca ref past allocation size */
1124 r
= gv(RC_INT
); /* allocation size */
1128 /* We align to 16 bytes rather than align */
1135 /* end of X86 code generator */
1136 /*************************************************************/
1138 /*************************************************************/