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Filter: Implement constant promotion for multiple dispatch methods

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This commit is contained in:
Ondrej Zajicek 2023-07-25 17:43:52 +02:00
parent e886959131
commit f0d1396073
3 changed files with 25 additions and 10 deletions
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9
filter/decl.m4
View File

@ -379,7 +379,8 @@ m4_undivert(102)m4_dnl
[[m4_dnl The one case in The Big Switch inside interpreter
case INST_NAME():
#define whati (&(what->i_]]INST_NAME()[[))
m4_ifelse(m4_eval(INST_INVAL() > 0), 1, [[if (fstk->vcnt < INST_INVAL()) runtime("Stack underflow"); fstk->vcnt -= INST_INVAL(); ]])
m4_ifelse(m4_eval(INST_INVAL() > 0), 1, [[if (fstk->vcnt < INST_INVAL()) runtime("Stack underflow");
fstk->vcnt -= INST_INVAL();]])
m4_undivert(108)m4_dnl
#undef whati
break;
@ -572,8 +573,8 @@ fi_constant(struct f_inst *what, struct f_val val)
return what;
}
static int
f_const_promotion(struct f_inst *arg, enum f_type want)
int
f_const_promotion_(struct f_inst *arg, enum f_type want, int update)
{
if (arg->fi_code != FI_CONSTANT)
return 0;
@ -581,6 +582,7 @@ f_const_promotion(struct f_inst *arg, enum f_type want)
struct f_val *c = &arg->i_FI_CONSTANT.val;
if ((c->type == T_IP) && ipa_is_ip4(c->val.ip) && (want == T_QUAD)) {
if (update)
*c = (struct f_val) {
.type = T_QUAD,
.val.i = ipa_to_u32(c->val.ip),
@ -589,6 +591,7 @@ f_const_promotion(struct f_inst *arg, enum f_type want)
}
else if ((c->type == T_SET) && (!c->val.t) && (want == T_PREFIX_SET)) {
if (update)
*c = f_const_empty_prefix_set;
return 1;
}

10
filter/f-inst.h
View File

@ -36,6 +36,16 @@ const char *f_instruction_name_(enum f_instruction_code fi);
static inline const char *f_instruction_name(enum f_instruction_code fi)
{ return f_instruction_name_(fi) + 3; }
int f_const_promotion_(struct f_inst *arg, enum f_type want, int update);
static inline int f_const_promotion(struct f_inst *arg, enum f_type want)
{ return f_const_promotion_(arg, want, 1); }
static inline int f_try_const_promotion(struct f_inst *arg, enum f_type want)
{ return f_const_promotion_(arg, want, 0); }
struct f_arg {
struct symbol *arg;
struct f_arg *next;

6
filter/f-util.c
View File

@ -48,7 +48,8 @@ f_match_signature(const struct f_method *dsc, struct f_inst *args)
int i, arg_num = (int) dsc->arg_num;
for (i = 1; args && (i < arg_num); args = args->next, i++)
if (dsc->args_type[i] && (args->type != dsc->args_type[i]))
if (dsc->args_type[i] && (args->type != dsc->args_type[i]) &&
!f_try_const_promotion(args, dsc->args_type[i]))
return 0;
return !args && !(i < arg_num);
@ -61,7 +62,8 @@ f_match_signature_err(const struct f_method *dsc, struct f_inst *args, int *pos,
int i, arg_num = (int) dsc->arg_num;
for (i = 1; args && (i < arg_num); args = args->next, i++)
if (dsc->args_type[i] && (args->type != dsc->args_type[i]))
if (dsc->args_type[i] && (args->type != dsc->args_type[i]) &&
!f_try_const_promotion(args, dsc->args_type[i]))
break;
*pos = i;