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 */
27 /* a register can belong to several classes. The classes must be
28 sorted from more general to more precise (see gv2() code which does
29 assumptions on it). */
30 #define RC_INT 0x0001 /* generic integer register */
31 #define RC_FLOAT 0x0002 /* generic float register */
36 #define RC_IRET RC_EAX /* function return: integer register */
37 #define RC_LRET RC_EDX /* function return: second integer register */
38 #define RC_FRET RC_ST0 /* function return: float register */
40 /* pretty names for the registers */
49 /* return registers for function */
50 #define REG_IRET TREG_EAX /* single word int return register */
51 #define REG_LRET TREG_EDX /* second word return register (for long long) */
52 #define REG_FRET TREG_ST0 /* float return register */
54 /* defined if function parameters must be evaluated in reverse order */
55 #define INVERT_FUNC_PARAMS
57 /* defined if structures are passed as pointers. Otherwise structures
58 are directly pushed on stack. */
59 /* #define FUNC_STRUCT_PARAM_AS_PTR */
61 /* pointer size, in bytes */
64 /* long double size and alignment, in bytes */
65 #define LDOUBLE_SIZE 12
66 #define LDOUBLE_ALIGN 4
67 /* maximum alignment (for aligned attribute support) */
73 /******************************************************/
76 #define EM_TCC_TARGET EM_386
78 /* relocation type for 32 bit data relocation */
79 #define R_DATA_32 R_386_32
80 #define R_DATA_PTR R_386_32
81 #define R_JMP_SLOT R_386_JMP_SLOT
82 #define R_COPY R_386_COPY
84 #define ELF_START_ADDR 0x08048000
85 #define ELF_PAGE_SIZE 0x1000
87 /******************************************************/
88 #else /* ! TARGET_DEFS_ONLY */
89 /******************************************************/
92 ST_DATA
const int reg_classes
[NB_REGS
] = {
93 /* eax */ RC_INT
| RC_EAX
,
94 /* ecx */ RC_INT
| RC_ECX
,
95 /* edx */ RC_INT
| RC_EDX
,
96 /* st0 */ RC_FLOAT
| RC_ST0
,
99 static unsigned long func_sub_sp_offset
;
100 static int func_ret_sub
;
101 #ifdef CONFIG_TCC_BCHECK
102 static addr_t func_bound_offset
;
105 /* XXX: make it faster ? */
106 ST_FUNC
void g(int c
)
110 if (ind1
> cur_text_section
->data_allocated
)
111 section_realloc(cur_text_section
, ind1
);
112 cur_text_section
->data
[ind
] = c
;
116 ST_FUNC
void o(unsigned int c
)
124 ST_FUNC
void gen_le16(int v
)
130 ST_FUNC
void gen_le32(int c
)
138 /* output a symbol and patch all calls to it */
139 ST_FUNC
void gsym_addr(int t
, int a
)
142 unsigned char *ptr
= cur_text_section
->data
+ t
;
143 uint32_t n
= read32le(ptr
); /* next value */
144 write32le(ptr
, a
- t
- 4);
149 ST_FUNC
void gsym(int t
)
154 /* psym is used to put an instruction with a data field which is a
155 reference to a symbol. It is in fact the same as oad ! */
158 /* instruction + 4 bytes data. Return the address of the data */
159 ST_FUNC
int oad(int c
, int s
)
165 if (ind1
> cur_text_section
->data_allocated
)
166 section_realloc(cur_text_section
, ind1
);
167 write32le(cur_text_section
->data
+ ind
, s
);
173 /* output constant with relocation if 'r & VT_SYM' is true */
174 ST_FUNC
void gen_addr32(int r
, Sym
*sym
, int c
)
177 greloc(cur_text_section
, sym
, ind
, R_386_32
);
181 ST_FUNC
void gen_addrpc32(int r
, Sym
*sym
, int c
)
184 greloc(cur_text_section
, sym
, ind
, R_386_PC32
);
188 /* generate a modrm reference. 'op_reg' contains the addtionnal 3
190 static void gen_modrm(int op_reg
, int r
, Sym
*sym
, int c
)
192 op_reg
= op_reg
<< 3;
193 if ((r
& VT_VALMASK
) == VT_CONST
) {
194 /* constant memory reference */
196 gen_addr32(r
, sym
, c
);
197 } else if ((r
& VT_VALMASK
) == VT_LOCAL
) {
198 /* currently, we use only ebp as base */
200 /* short reference */
204 oad(0x85 | op_reg
, c
);
207 g(0x00 | op_reg
| (r
& VT_VALMASK
));
211 /* load 'r' from value 'sv' */
212 ST_FUNC
void load(int r
, SValue
*sv
)
214 int v
, t
, ft
, fc
, fr
;
219 sv
= pe_getimport(sv
, &v2
);
226 ft
&= ~(VT_VOLATILE
| VT_CONSTANT
);
230 if (v
== VT_LLOCAL
) {
232 v1
.r
= VT_LOCAL
| VT_LVAL
;
235 if (!(reg_classes
[fr
] & RC_INT
))
236 fr
= get_reg(RC_INT
);
239 if ((ft
& VT_BTYPE
) == VT_FLOAT
) {
242 } else if ((ft
& VT_BTYPE
) == VT_DOUBLE
) {
245 } else if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
248 } else if ((ft
& VT_TYPE
) == VT_BYTE
|| (ft
& VT_TYPE
) == VT_BOOL
) {
249 o(0xbe0f); /* movsbl */
250 } else if ((ft
& VT_TYPE
) == (VT_BYTE
| VT_UNSIGNED
)) {
251 o(0xb60f); /* movzbl */
252 } else if ((ft
& VT_TYPE
) == VT_SHORT
) {
253 o(0xbf0f); /* movswl */
254 } else if ((ft
& VT_TYPE
) == (VT_SHORT
| VT_UNSIGNED
)) {
255 o(0xb70f); /* movzwl */
259 gen_modrm(r
, fr
, sv
->sym
, fc
);
262 o(0xb8 + r
); /* mov $xx, r */
263 gen_addr32(fr
, sv
->sym
, fc
);
264 } else if (v
== VT_LOCAL
) {
266 o(0x8d); /* lea xxx(%ebp), r */
267 gen_modrm(r
, VT_LOCAL
, sv
->sym
, fc
);
270 o(0xe8 + r
); /* mov %ebp, r */
272 } else if (v
== VT_CMP
) {
273 oad(0xb8 + r
, 0); /* mov $0, r */
274 o(0x0f); /* setxx %br */
277 } else if (v
== VT_JMP
|| v
== VT_JMPI
) {
279 oad(0xb8 + r
, t
); /* mov $1, r */
280 o(0x05eb); /* jmp after */
282 oad(0xb8 + r
, t
^ 1); /* mov $0, r */
285 o(0xc0 + r
+ v
* 8); /* mov v, r */
290 /* store register 'r' in lvalue 'v' */
291 ST_FUNC
void store(int r
, SValue
*v
)
297 v
= pe_getimport(v
, &v2
);
302 fr
= v
->r
& VT_VALMASK
;
303 ft
&= ~(VT_VOLATILE
| VT_CONSTANT
);
305 /* XXX: incorrect if float reg to reg */
306 if (bt
== VT_FLOAT
) {
309 } else if (bt
== VT_DOUBLE
) {
312 } else if (bt
== VT_LDOUBLE
) {
313 o(0xc0d9); /* fld %st(0) */
319 if (bt
== VT_BYTE
|| bt
== VT_BOOL
)
324 if (fr
== VT_CONST
||
327 gen_modrm(r
, v
->r
, v
->sym
, fc
);
328 } else if (fr
!= r
) {
329 o(0xc0 + fr
+ r
* 8); /* mov r, fr */
333 static void gadd_sp(int val
)
335 if (val
== (char)val
) {
339 oad(0xc481, val
); /* add $xxx, %esp */
343 static void gen_static_call(int v
)
347 sym
= external_global_sym(v
, &func_old_type
, 0);
349 greloc(cur_text_section
, sym
, ind
-4, R_386_PC32
);
352 /* 'is_jmp' is '1' if it is a jump */
353 static void gcall_or_jmp(int is_jmp
)
356 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
)) == VT_CONST
) {
359 if (vtop
->r
& VT_SYM
) {
360 /* relocation case */
361 greloc(cur_text_section
, vtop
->sym
,
362 ind
+ 1, R_386_PC32
);
364 /* put an empty PC32 relocation */
365 put_elf_reloc(symtab_section
, cur_text_section
,
366 ind
+ 1, R_386_PC32
, 0);
368 oad(0xe8 + is_jmp
, vtop
->c
.i
- 4); /* call/jmp im */
369 /* extend the return value to the whole register if necessary
370 visual studio and gcc do not always set the whole eax register
371 when assigning the return value of a function */
372 rt
= vtop
->type
.ref
->type
.t
;
373 switch (rt
& VT_BTYPE
) {
375 if (rt
& VT_UNSIGNED
) {
376 o(0xc0b60f); /* movzx %al, %eax */
379 o(0xc0be0f); /* movsx %al, %eax */
383 if (rt
& VT_UNSIGNED
) {
384 o(0xc0b70f); /* movzx %ax, %eax */
387 o(0xc0bf0f); /* movsx %ax, %eax */
394 /* otherwise, indirect call */
396 o(0xff); /* call/jmp *r */
397 o(0xd0 + r
+ (is_jmp
<< 4));
401 static uint8_t fastcall_regs
[3] = { TREG_EAX
, TREG_EDX
, TREG_ECX
};
402 static uint8_t fastcallw_regs
[2] = { TREG_ECX
, TREG_EDX
};
404 /* Return the number of registers needed to return the struct, or 0 if
405 returning via struct pointer. */
406 ST_FUNC
int gfunc_sret(CType
*vt
, int variadic
, CType
*ret
, int *ret_align
, int *regsize
)
411 *ret_align
= 1; // Never have to re-align return values for x86
413 size
= type_size(vt
, &align
);
416 } else if (size
> 4) {
426 *ret_align
= 1; // Never have to re-align return values for x86
431 /* Generate function call. The function address is pushed first, then
432 all the parameters in call order. This functions pops all the
433 parameters and the function address. */
434 ST_FUNC
void gfunc_call(int nb_args
)
436 int size
, align
, r
, args_size
, i
, func_call
;
440 for(i
= 0;i
< nb_args
; i
++) {
441 if ((vtop
->type
.t
& VT_BTYPE
) == VT_STRUCT
) {
442 size
= type_size(&vtop
->type
, &align
);
443 /* align to stack align size */
444 size
= (size
+ 3) & ~3;
445 /* allocate the necessary size on stack */
446 oad(0xec81, size
); /* sub $xxx, %esp */
447 /* generate structure store */
449 o(0x89); /* mov %esp, r */
451 vset(&vtop
->type
, r
| VT_LVAL
, 0);
455 } else if (is_float(vtop
->type
.t
)) {
456 gv(RC_FLOAT
); /* only one float register */
457 if ((vtop
->type
.t
& VT_BTYPE
) == VT_FLOAT
)
459 else if ((vtop
->type
.t
& VT_BTYPE
) == VT_DOUBLE
)
463 oad(0xec81, size
); /* sub $xxx, %esp */
467 o(0x5cd9 + size
- 4); /* fstp[s|l] 0(%esp) */
472 /* simple type (currently always same size) */
473 /* XXX: implicit cast ? */
475 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
477 o(0x50 + vtop
->r2
); /* push r */
481 o(0x50 + r
); /* push r */
486 save_regs(0); /* save used temporary registers */
487 func_sym
= vtop
->type
.ref
;
488 func_call
= func_sym
->a
.func_call
;
490 if ((func_call
>= FUNC_FASTCALL1
&& func_call
<= FUNC_FASTCALL3
) ||
491 func_call
== FUNC_FASTCALLW
) {
492 int fastcall_nb_regs
;
493 uint8_t *fastcall_regs_ptr
;
494 if (func_call
== FUNC_FASTCALLW
) {
495 fastcall_regs_ptr
= fastcallw_regs
;
496 fastcall_nb_regs
= 2;
498 fastcall_regs_ptr
= fastcall_regs
;
499 fastcall_nb_regs
= func_call
- FUNC_FASTCALL1
+ 1;
501 for(i
= 0;i
< fastcall_nb_regs
; i
++) {
504 o(0x58 + fastcall_regs_ptr
[i
]); /* pop r */
505 /* XXX: incorrect for struct/floats */
509 #ifndef TCC_TARGET_PE
510 else if ((vtop
->type
.ref
->type
.t
& VT_BTYPE
) == VT_STRUCT
)
515 if (args_size
&& func_call
!= FUNC_STDCALL
)
521 #define FUNC_PROLOG_SIZE 10
523 #define FUNC_PROLOG_SIZE 9
526 /* generate function prolog of type 't' */
527 ST_FUNC
void gfunc_prolog(CType
*func_type
)
529 int addr
, align
, size
, func_call
, fastcall_nb_regs
;
530 int param_index
, param_addr
;
531 uint8_t *fastcall_regs_ptr
;
535 sym
= func_type
->ref
;
536 func_call
= sym
->a
.func_call
;
541 if (func_call
>= FUNC_FASTCALL1
&& func_call
<= FUNC_FASTCALL3
) {
542 fastcall_nb_regs
= func_call
- FUNC_FASTCALL1
+ 1;
543 fastcall_regs_ptr
= fastcall_regs
;
544 } else if (func_call
== FUNC_FASTCALLW
) {
545 fastcall_nb_regs
= 2;
546 fastcall_regs_ptr
= fastcallw_regs
;
548 fastcall_nb_regs
= 0;
549 fastcall_regs_ptr
= NULL
;
553 ind
+= FUNC_PROLOG_SIZE
;
554 func_sub_sp_offset
= ind
;
555 /* if the function returns a structure, then add an
556 implicit pointer parameter */
558 func_var
= (sym
->c
== FUNC_ELLIPSIS
);
560 size
= type_size(&func_vt
,&align
);
561 if (((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) && (size
> 8)) {
563 if ((func_vt
.t
& VT_BTYPE
) == VT_STRUCT
) {
565 /* XXX: fastcall case ? */
570 /* define parameters */
571 while ((sym
= sym
->next
) != NULL
) {
573 size
= type_size(type
, &align
);
574 size
= (size
+ 3) & ~3;
575 #ifdef FUNC_STRUCT_PARAM_AS_PTR
576 /* structs are passed as pointer */
577 if ((type
->t
& VT_BTYPE
) == VT_STRUCT
) {
581 if (param_index
< fastcall_nb_regs
) {
582 /* save FASTCALL register */
585 gen_modrm(fastcall_regs_ptr
[param_index
], VT_LOCAL
, NULL
, loc
);
591 sym_push(sym
->v
& ~SYM_FIELD
, type
,
592 VT_LOCAL
| lvalue_type(type
->t
), param_addr
);
596 /* pascal type call ? */
597 if (func_call
== FUNC_STDCALL
)
598 func_ret_sub
= addr
- 8;
599 #ifndef TCC_TARGET_PE
604 #ifdef CONFIG_TCC_BCHECK
605 /* leave some room for bound checking code */
606 if (tcc_state
->do_bounds_check
) {
607 oad(0xb8, 0); /* lbound section pointer */
608 oad(0xb8, 0); /* call to function */
609 func_bound_offset
= lbounds_section
->data_offset
;
614 /* generate function epilog */
615 ST_FUNC
void gfunc_epilog(void)
619 #ifdef CONFIG_TCC_BCHECK
620 if (tcc_state
->do_bounds_check
621 && func_bound_offset
!= lbounds_section
->data_offset
) {
625 /* add end of table info */
626 bounds_ptr
= section_ptr_add(lbounds_section
, sizeof(addr_t
));
628 /* generate bound local allocation */
630 ind
= func_sub_sp_offset
;
631 sym_data
= get_sym_ref(&char_pointer_type
, lbounds_section
,
632 func_bound_offset
, lbounds_section
->data_offset
);
633 greloc(cur_text_section
, sym_data
,
635 oad(0xb8, 0); /* mov %eax, xxx */
636 gen_static_call(TOK___bound_local_new
);
639 /* generate bound check local freeing */
640 o(0x5250); /* save returned value, if any */
641 greloc(cur_text_section
, sym_data
,
643 oad(0xb8, 0); /* mov %eax, xxx */
644 gen_static_call(TOK___bound_local_delete
);
646 o(0x585a); /* restore returned value, if any */
650 if (func_ret_sub
== 0) {
655 g(func_ret_sub
>> 8);
657 /* align local size to word & save local variables */
661 ind
= func_sub_sp_offset
- FUNC_PROLOG_SIZE
;
664 oad(0xb8, v
); /* mov stacksize, %eax */
665 gen_static_call(TOK___chkstk
); /* call __chkstk, (does the stackframe too) */
669 o(0xe58955); /* push %ebp, mov %esp, %ebp */
670 o(0xec81); /* sub esp, stacksize */
672 #if FUNC_PROLOG_SIZE == 10
673 o(0x90); /* adjust to FUNC_PROLOG_SIZE */
679 /* generate a jump to a label */
680 ST_FUNC
int gjmp(int t
)
682 return psym(0xe9, t
);
685 /* generate a jump to a fixed address */
686 ST_FUNC
void gjmp_addr(int a
)
694 oad(0xe9, a
- ind
- 5);
698 /* generate a test. set 'inv' to invert test. Stack entry is popped */
699 ST_FUNC
int gtst(int inv
, int t
)
701 int v
= vtop
->r
& VT_VALMASK
;
703 /* fast case : can jump directly since flags are set */
705 t
= psym((vtop
->c
.i
- 16) ^ inv
, t
);
706 } else if (v
== VT_JMP
|| v
== VT_JMPI
) {
707 /* && or || optimization */
708 if ((v
& 1) == inv
) {
709 /* insert vtop->c jump list in t */
710 uint32_t n1
, n
= vtop
->c
.i
;
712 while ((n1
= read32le(cur_text_section
->data
+ n
)))
714 write32le(cur_text_section
->data
+ n
, t
);
726 /* generate an integer binary operation */
727 ST_FUNC
void gen_opi(int op
)
733 case TOK_ADDC1
: /* add with carry generation */
736 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
743 /* generate inc and dec for smaller code */
744 if (c
==1 && opc
==0) {
746 } else if (c
==1 && opc
==5) {
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
) {
771 case TOK_SUBC1
: /* sub with carry generation */
774 case TOK_ADDC2
: /* add with carry use */
777 case TOK_SUBC2
: /* sub with carry use */
794 o(0xaf0f); /* imul fr, r */
795 o(0xc0 + fr
+ r
* 8);
806 opc
= 0xc0 | (opc
<< 3);
807 if ((vtop
->r
& (VT_VALMASK
| VT_LVAL
| VT_SYM
)) == VT_CONST
) {
812 c
= vtop
->c
.i
& 0x1f;
813 o(0xc1); /* shl/shr/sar $xxx, r */
817 /* we generate the shift in ecx */
820 o(0xd3); /* shl/shr/sar %cl, r */
831 /* first operand must be in eax */
832 /* XXX: need better constraint for second operand */
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 guaranted 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 */
927 /* no memory reference possible for long double operations */
928 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LDOUBLE
) {
929 load(TREG_ST0
, vtop
);
954 if ((ft
& VT_BTYPE
) == VT_LDOUBLE
) {
955 o(0xde); /* fxxxp %st, %st(1) */
958 /* if saved lvalue, then we must reload it */
960 if ((r
& VT_VALMASK
) == VT_LLOCAL
) {
964 v1
.r
= VT_LOCAL
| VT_LVAL
;
970 if ((ft
& VT_BTYPE
) == VT_DOUBLE
)
974 gen_modrm(a
, r
, vtop
->sym
, fc
);
980 /* convert integers to fp 't' type. Must handle 'int', 'unsigned int'
981 and 'long long' cases. */
982 ST_FUNC
void gen_cvt_itof(int t
)
986 if ((vtop
->type
.t
& VT_BTYPE
) == VT_LLONG
) {
987 /* signed long long to float/double/long double (unsigned case
988 is handled generically) */
989 o(0x50 + vtop
->r2
); /* push r2 */
990 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
991 o(0x242cdf); /* fildll (%esp) */
992 o(0x08c483); /* add $8, %esp */
993 } else if ((vtop
->type
.t
& (VT_BTYPE
| VT_UNSIGNED
)) ==
994 (VT_INT
| VT_UNSIGNED
)) {
995 /* unsigned int to float/double/long double */
996 o(0x6a); /* push $0 */
998 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
999 o(0x242cdf); /* fildll (%esp) */
1000 o(0x08c483); /* add $8, %esp */
1002 /* int to float/double/long double */
1003 o(0x50 + (vtop
->r
& VT_VALMASK
)); /* push r */
1004 o(0x2404db); /* fildl (%esp) */
1005 o(0x04c483); /* add $4, %esp */
1010 /* convert fp to int 't' type */
1011 ST_FUNC
void gen_cvt_ftoi(int t
)
1013 #ifndef COMMIT_4ad186c5ef61_IS_FIXED
1014 /* a good version but it takes a more time to execute */
1018 gen_static_call(TOK___tcc_cvt_ftol
);
1019 vtop
->r
= TREG_EAX
; /* mark reg as used */
1021 vtop
->r2
= TREG_EDX
;
1023 /* a new version with a bug: t2a = 44100312 */
1029 int t2a = (int)(t1 * f); // must be 44100313
1030 int t2b = (int)(t1 * (float)0.25f);
1031 printf("t2a=%d t2b=%d \n",t2a,t2b);
1035 int bt
= vtop
->type
.t
& VT_BTYPE
;
1037 vpush_global_sym(&func_old_type
, TOK___fixsfdi
);
1038 else if (bt
== VT_LDOUBLE
)
1039 vpush_global_sym(&func_old_type
, TOK___fixxfdi
);
1041 vpush_global_sym(&func_old_type
, TOK___fixdfdi
);
1046 vtop
->r2
= REG_LRET
;
1050 /* convert from one floating point type to another */
1051 ST_FUNC
void gen_cvt_ftof(int t
)
1053 /* all we have to do on i386 is to put the float in a register */
1057 /* computed goto support */
1058 ST_FUNC
void ggoto(void)
1064 /* bound check support functions */
1065 #ifdef CONFIG_TCC_BCHECK
1067 /* generate a bounded pointer addition */
1068 ST_FUNC
void gen_bounded_ptr_add(void)
1070 /* prepare fast i386 function call (args in eax and edx) */
1071 gv2(RC_EAX
, RC_EDX
);
1072 /* save all temporary registers */
1075 /* do a fast function call */
1076 gen_static_call(TOK___bound_ptr_add
);
1077 /* returned pointer is in eax */
1079 vtop
->r
= TREG_EAX
| VT_BOUNDED
;
1080 /* address of bounding function call point */
1081 vtop
->c
.i
= (cur_text_section
->reloc
->data_offset
- sizeof(Elf32_Rel
));
1084 /* patch pointer addition in vtop so that pointer dereferencing is
1086 ST_FUNC
void gen_bounded_ptr_deref(void)
1094 /* XXX: put that code in generic part of tcc */
1095 if (!is_float(vtop
->type
.t
)) {
1096 if (vtop
->r
& VT_LVAL_BYTE
)
1098 else if (vtop
->r
& VT_LVAL_SHORT
)
1102 size
= type_size(&vtop
->type
, &align
);
1104 case 1: func
= TOK___bound_ptr_indir1
; break;
1105 case 2: func
= TOK___bound_ptr_indir2
; break;
1106 case 4: func
= TOK___bound_ptr_indir4
; break;
1107 case 8: func
= TOK___bound_ptr_indir8
; break;
1108 case 12: func
= TOK___bound_ptr_indir12
; break;
1109 case 16: func
= TOK___bound_ptr_indir16
; break;
1111 tcc_error("unhandled size when dereferencing bounded pointer");
1116 /* patch relocation */
1117 /* XXX: find a better solution ? */
1118 rel
= (Elf32_Rel
*)(cur_text_section
->reloc
->data
+ vtop
->c
.i
);
1119 sym
= external_global_sym(func
, &func_old_type
, 0);
1121 put_extern_sym(sym
, NULL
, 0, 0);
1122 rel
->r_info
= ELF32_R_INFO(sym
->c
, ELF32_R_TYPE(rel
->r_info
));
1126 /* Save the stack pointer onto the stack */
1127 ST_FUNC
void gen_vla_sp_save(int addr
) {
1128 /* mov %esp,addr(%ebp)*/
1130 gen_modrm(TREG_ESP
, VT_LOCAL
, NULL
, addr
);
1133 /* Restore the SP from a location on the stack */
1134 ST_FUNC
void gen_vla_sp_restore(int addr
) {
1136 gen_modrm(TREG_ESP
, VT_LOCAL
, NULL
, addr
);
1139 /* Subtract from the stack pointer, and push the resulting value onto the stack */
1140 ST_FUNC
void gen_vla_alloc(CType
*type
, int align
) {
1141 #ifdef TCC_TARGET_PE
1142 /* alloca does more than just adjust %rsp on Windows */
1143 vpush_global_sym(&func_old_type
, TOK_alloca
);
1144 vswap(); /* Move alloca ref past allocation size */
1148 r
= gv(RC_INT
); /* allocation size */
1152 /* We align to 16 bytes rather than align */
1159 /* end of X86 code generator */
1160 /*************************************************************/
1162 /*************************************************************/