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primitive fastcall functions support

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This commit is contained in:
bellard 2004-10-18 00:14:40 +00:00
parent 4d9f6d2bcf
commit 72a88fbab0
1 changed files with 46 additions and 9 deletions
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53
i386-gen.c
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@ -320,12 +320,14 @@ static void gcall_or_jmp(int is_jmp)
} }
} }
static uint8_t fastcall_regs[3] = { TREG_EAX, TREG_EDX, TREG_ECX };
/* Generate function call. The function address is pushed first, then /* Generate function call. The function address is pushed first, then
all the parameters in call order. This functions pops all the all the parameters in call order. This functions pops all the
parameters and the function address. */ parameters and the function address. */
void gfunc_call(int nb_args) void gfunc_call(int nb_args)
{ {
int size, align, r, args_size, i; int size, align, r, args_size, i, func_call;
Sym *func_sym; Sym *func_sym;
args_size = 0; args_size = 0;
@ -377,8 +379,21 @@ void gfunc_call(int nb_args)
} }
save_regs(0); /* save used temporary registers */ save_regs(0); /* save used temporary registers */
func_sym = vtop->type.ref; func_sym = vtop->type.ref;
func_call = func_sym->r;
/* fast call case */
if (func_call >= FUNC_FASTCALL1 && func_call <= FUNC_FASTCALL3) {
int fastcall_nb_regs;
fastcall_nb_regs = func_call - FUNC_FASTCALL1 + 1;
for(i = 0;i < fastcall_nb_regs; i++) {
if (args_size <= 0)
break;
o(0x58 + fastcall_regs[i]); /* pop r */
/* XXX: incorrect for struct/floats */
args_size -= 4;
}
}
gcall_or_jmp(0); gcall_or_jmp(0);
if (args_size && func_sym->r == FUNC_CDECL) if (args_size && func_sym->r != FUNC_STDCALL)
gadd_sp(args_size); gadd_sp(args_size);
vtop--; vtop--;
} }
@ -386,25 +401,37 @@ void gfunc_call(int nb_args)
/* generate function prolog of type 't' */ /* generate function prolog of type 't' */
void gfunc_prolog(CType *func_type) void gfunc_prolog(CType *func_type)
{ {
int addr, align, size, func_call; int addr, align, size, func_call, fastcall_nb_regs;
int param_index, param_addr;
Sym *sym; Sym *sym;
CType *type; CType *type;
sym = func_type->ref; sym = func_type->ref;
func_call = sym->r; func_call = sym->r;
addr = 8; addr = 8;
loc = 0;
if (func_call >= FUNC_FASTCALL1 && func_call <= FUNC_FASTCALL3) {
fastcall_nb_regs = func_call - FUNC_FASTCALL1 + 1;
} else {
fastcall_nb_regs = 0;
}
param_index = 0;
o(0xe58955); /* push %ebp, mov %esp, %ebp */
func_sub_sp_offset = oad(0xec81, 0); /* sub $xxx, %esp */
/* if the function returns a structure, then add an /* if the function returns a structure, then add an
implicit pointer parameter */ implicit pointer parameter */
func_vt = sym->type; func_vt = sym->type;
if ((func_vt.t & VT_BTYPE) == VT_STRUCT) { if ((func_vt.t & VT_BTYPE) == VT_STRUCT) {
/* XXX: fastcall case ? */
func_vc = addr; func_vc = addr;
addr += 4; addr += 4;
param_index++;
} }
/* define parameters */ /* define parameters */
while ((sym = sym->next) != NULL) { while ((sym = sym->next) != NULL) {
type = &sym->type; type = &sym->type;
sym_push(sym->v & ~SYM_FIELD, type,
VT_LOCAL | VT_LVAL, addr);
size = type_size(type, &align); size = type_size(type, &align);
size = (size + 3) & ~3; size = (size + 3) & ~3;
#ifdef FUNC_STRUCT_PARAM_AS_PTR #ifdef FUNC_STRUCT_PARAM_AS_PTR
@ -413,21 +440,31 @@ void gfunc_prolog(CType *func_type)
size = 4; size = 4;
} }
#endif #endif
if (param_index < fastcall_nb_regs) {
/* save FASTCALL register */
loc -= 4;
o(0x89); /* movl */
gen_modrm(fastcall_regs[param_index], VT_LOCAL, NULL, loc);
param_addr = loc;
} else {
param_addr = addr;
addr += size; addr += size;
} }
sym_push(sym->v & ~SYM_FIELD, type,
VT_LOCAL | VT_LVAL, param_addr);
param_index++;
}
func_ret_sub = 0; func_ret_sub = 0;
/* pascal type call ? */ /* pascal type call ? */
if (func_call == FUNC_STDCALL) if (func_call == FUNC_STDCALL)
func_ret_sub = addr - 8; func_ret_sub = addr - 8;
o(0xe58955); /* push %ebp, mov %esp, %ebp */
func_sub_sp_offset = oad(0xec81, 0); /* sub $xxx, %esp */
/* leave some room for bound checking code */ /* leave some room for bound checking code */
if (do_bounds_check) { if (do_bounds_check) {
oad(0xb8, 0); /* lbound section pointer */ oad(0xb8, 0); /* lbound section pointer */
oad(0xb8, 0); /* call to function */ oad(0xb8, 0); /* call to function */
func_bound_offset = lbounds_section->data_offset; func_bound_offset = lbounds_section->data_offset;
} }
loc = 0;
} }
/* generate function epilog */ /* generate function epilog */