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Filter: Better constant promotion

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We use constant promotion from IPv4 to Router-ID values, as they have
same literals. Instead of ad-hoc code in filter instructions, add
constant promotion code to parse-time typecheck code.
This commit is contained in:
Ondrej Zajicek (work) 2019-10-23 22:56:23 +02:00
parent 26194bd684
commit c00c20a799
1 changed files with 20 additions and 1 deletions
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21
filter/decl.m4
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@ -163,7 +163,7 @@ FID_HIC(,[[
m4_define(ARG, `ARG_ANY($1) ARG_TYPE($1,$2)')
m4_define(ARG_TYPE, `
FID_NEW_BODY()m4_dnl
if (f$1->type && (f$1->type != ($2)))
if (f$1->type && (f$1->type != ($2)) && !f_const_promotion(f$1, ($2)))
cf_error("Argument $1 of instruction %s must be of type $2, got 0x%02x", f_instruction_name(what->fi_code), f$1->type);
FID_INTERPRET_EXEC()m4_dnl
if (v$1.type != ($2))
@ -446,6 +446,25 @@ 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)
{
if (arg->fi_code != FI_CONSTANT)
return 0;
struct f_val *c = &arg->i_FI_CONSTANT.val;
if ((c->type == T_IP) && ipa_is_ip4(c->val.ip) && (want == T_QUAD)) {
*c = (struct f_val) {
.type = T_QUAD,
.val.i = ipa_to_u32(c->val.ip),
};
return 1;
}
return 0;
}
#define v1 whati->f1->i_FI_CONSTANT.val
#define v2 whati->f2->i_FI_CONSTANT.val
#define v3 whati->f3->i_FI_CONSTANT.val