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Gate codegen metadata output under metadata feature.

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This commit is contained in:
Stephen Chung 2021-03-26 10:59:34 +08:00
parent 8ea218f907
commit c443c3bb48
7 changed files with 189 additions and 92 deletions
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2
Cargo.toml
View File

@ -19,7 +19,7 @@ categories = ["no-std", "embedded", "wasm", "parser-implementations"]
smallvec = { version = "1.6", default-features = false, features = ["union"] }
ahash = { version = "0.7", default-features = false }
num-traits = { version = "0.2", default_features = false }
rhai_codegen = { version = "0.3.4", path = "codegen" }
rhai_codegen = { version = "0.3.4", path = "codegen", features = ["metadata"] }
[features]
default = []

4
codegen/Cargo.toml
View File

@ -11,6 +11,10 @@ license = "MIT OR Apache-2.0"
[lib]
proc-macro = true
[features]
default = []
metadata = []
[dev-dependencies]
rhai = { path = "..", version = "^0.19.15" }
trybuild = "1"

15
codegen/src/function.rs
View File

@ -650,6 +650,7 @@ impl ExportedFn {
let mut unpack_statements: Vec<syn::Stmt> = Vec::new();
let mut unpack_exprs: Vec<syn::Expr> = Vec::new();
#[cfg(feature = "metadata")]
let mut input_type_names: Vec<String> = Vec::new();
let mut input_type_exprs: Vec<syn::Expr> = Vec::new();
@ -671,6 +672,7 @@ impl ExportedFn {
let var = syn::Ident::new("arg0", proc_macro2::Span::call_site());
match first_arg {
syn::FnArg::Typed(syn::PatType { pat, ty, .. }) => {
#[cfg(feature = "metadata")]
let arg_name = format!("{}: {}", pat.to_token_stream(), print_type(ty));
let arg_type = match flatten_type_groups(ty.as_ref()) {
syn::Type::Reference(syn::TypeReference { ref elem, .. }) => elem.as_ref(),
@ -699,6 +701,7 @@ impl ExportedFn {
.unwrap(),
);
}
#[cfg(feature = "metadata")]
input_type_names.push(arg_name);
input_type_exprs.push(
syn::parse2::<syn::Expr>(quote_spanned!(arg_type.span() =>
@ -726,6 +729,7 @@ impl ExportedFn {
let is_ref;
match arg {
syn::FnArg::Typed(syn::PatType { pat, ty, .. }) => {
#[cfg(feature = "metadata")]
let arg_name = format!("{}: {}", pat.to_token_stream(), print_type(ty));
let arg_type = ty.as_ref();
let downcast_span = match flatten_type_groups(arg_type) {
@ -765,6 +769,7 @@ impl ExportedFn {
})
.unwrap(),
);
#[cfg(feature = "metadata")]
input_type_names.push(arg_name);
if !is_string {
input_type_exprs.push(
@ -817,9 +822,17 @@ impl ExportedFn {
};
let type_name = syn::Ident::new(on_type_name, proc_macro2::Span::call_site());
#[cfg(feature = "metadata")]
let param_names = quote! {
pub const PARAM_NAMES: &'static [&'static str] = &[#(#input_type_names,)* #return_type];
};
#[cfg(not(feature = "metadata"))]
let param_names = quote! {};
quote! {
impl #type_name {
pub const PARAM_NAMES: &'static [&'static str] = &[#(#input_type_names,)* #return_type];
#param_names
#[inline(always)] pub fn param_types() -> [TypeId; #arg_count] { [#(#input_type_exprs),*] }
}
impl PluginFunction for #type_name {

28
codegen/src/lib.rs
View File

@ -330,11 +330,19 @@ pub fn set_exported_fn(args: proc_macro::TokenStream) -> proc_macro::TokenStream
match crate::register::parse_register_macro(args) {
Ok((module_expr, export_name, rust_mod_path)) => {
let gen_mod_path = crate::register::generated_module_path(&rust_mod_path);
#[cfg(feature = "metadata")]
let param_names = quote! {
Some(#gen_mod_path::Token::PARAM_NAMES)
};
#[cfg(not(feature = "metadata"))]
let param_names = quote! { None };
proc_macro::TokenStream::from(quote! {
#module_expr.set_fn(#export_name, FnNamespace::Internal, FnAccess::Public,
Some(#gen_mod_path::Token::PARAM_NAMES),
#module_expr.set_plugin_fn(#export_name, FnNamespace::Internal, FnAccess::Public,
#param_names,
&#gen_mod_path::Token::param_types(),
#gen_mod_path::Token().into());
#gen_mod_path::Token());
})
}
Err(e) => e.to_compile_error().into(),
@ -371,11 +379,19 @@ pub fn set_exported_global_fn(args: proc_macro::TokenStream) -> proc_macro::Toke
match crate::register::parse_register_macro(args) {
Ok((module_expr, export_name, rust_mod_path)) => {
let gen_mod_path = crate::register::generated_module_path(&rust_mod_path);
#[cfg(feature = "metadata")]
let param_names = quote! {
Some(#gen_mod_path::Token::PARAM_NAMES)
};
#[cfg(not(feature = "metadata"))]
let param_names = quote! { None };
proc_macro::TokenStream::from(quote! {
#module_expr.set_fn(#export_name, FnNamespace::Global, FnAccess::Public,
Some(#gen_mod_path::Token::PARAM_NAMES),
#module_expr.set_plugin_fn(#export_name, FnNamespace::Global, FnAccess::Public,
#param_names,
&#gen_mod_path::Token::param_types(),
#gen_mod_path::Token().into());
#gen_mod_path::Token());
})
}
Err(e) => e.to_compile_error().into(),

13
codegen/src/rhai_module.rs
View File

@ -154,11 +154,18 @@ pub fn generate_body(
},
fn_literal.span(),
);
#[cfg(feature = "metadata")]
let param_names = quote! {
Some(#fn_token_name::PARAM_NAMES)
};
#[cfg(not(feature = "metadata"))]
let param_names = quote! { None };
set_fn_statements.push(
syn::parse2::<syn::Stmt>(quote! {
m.set_fn(#fn_literal, FnNamespace::#ns_str, FnAccess::Public,
Some(#fn_token_name::PARAM_NAMES), &[#(#fn_input_types),*],
#fn_token_name().into());
m.set_plugin_fn(#fn_literal, FnNamespace::#ns_str, FnAccess::Public,
#param_names, &[#(#fn_input_types),*], #fn_token_name());
})
.unwrap(),
);

112
codegen/src/test/module.rs
View File

@ -297,9 +297,9 @@ mod generate_tests {
}
#[allow(unused_mut)]
pub fn rhai_generate_into_module(m: &mut Module, flatten: bool) {
m.set_fn("get_mystic_number", FnNamespace::Internal, FnAccess::Public,
m.set_plugin_fn("get_mystic_number", FnNamespace::Internal, FnAccess::Public,
Some(get_mystic_number_token::PARAM_NAMES), &[],
get_mystic_number_token().into());
get_mystic_number_token());
if flatten {} else {}
}
#[allow(non_camel_case_types)]
@ -351,9 +351,9 @@ mod generate_tests {
}
#[allow(unused_mut)]
pub fn rhai_generate_into_module(m: &mut Module, flatten: bool) {
m.set_fn("add_one_to", FnNamespace::Global, FnAccess::Public,
m.set_plugin_fn("add_one_to", FnNamespace::Global, FnAccess::Public,
Some(add_one_to_token::PARAM_NAMES), &[TypeId::of::<INT>()],
add_one_to_token().into());
add_one_to_token());
if flatten {} else {}
}
#[allow(non_camel_case_types)]
@ -405,9 +405,9 @@ mod generate_tests {
}
#[allow(unused_mut)]
pub fn rhai_generate_into_module(m: &mut Module, flatten: bool) {
m.set_fn("add_one_to", FnNamespace::Internal, FnAccess::Public, Some(add_one_to_token::PARAM_NAMES),
m.set_plugin_fn("add_one_to", FnNamespace::Internal, FnAccess::Public, Some(add_one_to_token::PARAM_NAMES),
&[TypeId::of::<INT>()],
add_one_to_token().into());
add_one_to_token());
if flatten {} else {}
}
#[allow(non_camel_case_types)]
@ -470,12 +470,12 @@ mod generate_tests {
}
#[allow(unused_mut)]
pub fn rhai_generate_into_module(m: &mut Module, flatten: bool) {
m.set_fn("add_n", FnNamespace::Internal, FnAccess::Public, Some(add_one_to_token::PARAM_NAMES),
m.set_plugin_fn("add_n", FnNamespace::Internal, FnAccess::Public, Some(add_one_to_token::PARAM_NAMES),
&[TypeId::of::<INT>()],
add_one_to_token().into());
m.set_fn("add_n", FnNamespace::Internal, FnAccess::Public, Some(add_n_to_token::PARAM_NAMES),
add_one_to_token());
m.set_plugin_fn("add_n", FnNamespace::Internal, FnAccess::Public, Some(add_n_to_token::PARAM_NAMES),
&[TypeId::of::<INT>(), TypeId::of::<INT>()],
add_n_to_token().into());
add_n_to_token());
if flatten {} else {}
}
#[allow(non_camel_case_types)]
@ -545,9 +545,9 @@ mod generate_tests {
}
#[allow(unused_mut)]
pub fn rhai_generate_into_module(m: &mut Module, flatten: bool) {
m.set_fn("add_together", FnNamespace::Internal, FnAccess::Public, Some(add_together_token::PARAM_NAMES),
m.set_plugin_fn("add_together", FnNamespace::Internal, FnAccess::Public, Some(add_together_token::PARAM_NAMES),
&[TypeId::of::<INT>(), TypeId::of::<INT>()],
add_together_token().into());
add_together_token());
if flatten {} else {}
}
#[allow(non_camel_case_types)]
@ -601,15 +601,15 @@ mod generate_tests {
}
#[allow(unused_mut)]
pub fn rhai_generate_into_module(m: &mut Module, flatten: bool) {
m.set_fn("add", FnNamespace::Internal, FnAccess::Public, Some(add_together_token::PARAM_NAMES),
m.set_plugin_fn("add", FnNamespace::Internal, FnAccess::Public, Some(add_together_token::PARAM_NAMES),
&[TypeId::of::<INT>(), TypeId::of::<INT>()],
add_together_token().into());
m.set_fn("+", FnNamespace::Internal, FnAccess::Public, Some(add_together_token::PARAM_NAMES),
add_together_token());
m.set_plugin_fn("+", FnNamespace::Internal, FnAccess::Public, Some(add_together_token::PARAM_NAMES),
&[TypeId::of::<INT>(), TypeId::of::<INT>()],
add_together_token().into());
m.set_fn("add_together", FnNamespace::Internal, FnAccess::Public, Some(add_together_token::PARAM_NAMES),
add_together_token());
m.set_plugin_fn("add_together", FnNamespace::Internal, FnAccess::Public, Some(add_together_token::PARAM_NAMES),
&[TypeId::of::<INT>(), TypeId::of::<INT>()],
add_together_token().into());
add_together_token());
if flatten {} else {}
}
#[allow(non_camel_case_types)]
@ -844,9 +844,9 @@ mod generate_tests {
}
#[allow(unused_mut)]
pub fn rhai_generate_into_module(m: &mut Module, flatten: bool) {
m.set_fn("get_mystic_number", FnNamespace::Internal, FnAccess::Public,
m.set_plugin_fn("get_mystic_number", FnNamespace::Internal, FnAccess::Public,
Some(get_mystic_number_token::PARAM_NAMES), &[],
get_mystic_number_token().into());
get_mystic_number_token());
if flatten {} else {}
}
#[allow(non_camel_case_types)]
@ -928,9 +928,9 @@ mod generate_tests {
}
#[allow(unused_mut)]
pub fn rhai_generate_into_module(m: &mut Module, flatten: bool) {
m.set_fn("print_out_to", FnNamespace::Internal, FnAccess::Public, Some(print_out_to_token::PARAM_NAMES),
m.set_plugin_fn("print_out_to", FnNamespace::Internal, FnAccess::Public, Some(print_out_to_token::PARAM_NAMES),
&[TypeId::of::<ImmutableString>()],
print_out_to_token().into());
print_out_to_token());
if flatten {} else {}
}
#[allow(non_camel_case_types)]
@ -982,9 +982,9 @@ mod generate_tests {
}
#[allow(unused_mut)]
pub fn rhai_generate_into_module(m: &mut Module, flatten: bool) {
m.set_fn("print_out_to", FnNamespace::Internal, FnAccess::Public, Some(print_out_to_token::PARAM_NAMES),
m.set_plugin_fn("print_out_to", FnNamespace::Internal, FnAccess::Public, Some(print_out_to_token::PARAM_NAMES),
&[TypeId::of::<ImmutableString>()],
print_out_to_token().into());
print_out_to_token());
if flatten {} else {}
}
#[allow(non_camel_case_types)]
@ -1037,9 +1037,9 @@ mod generate_tests {
}
#[allow(unused_mut)]
pub fn rhai_generate_into_module(m: &mut Module, flatten: bool) {
m.set_fn("foo", FnNamespace::Internal, FnAccess::Public, Some(foo_token::PARAM_NAMES),
m.set_plugin_fn("foo", FnNamespace::Internal, FnAccess::Public, Some(foo_token::PARAM_NAMES),
&[TypeId::of::<FLOAT>(), TypeId::of::<INT>()],
foo_token().into());
foo_token());
if flatten {} else {}
}
#[allow(non_camel_case_types)]
@ -1092,9 +1092,9 @@ mod generate_tests {
}
#[allow(unused_mut)]
pub fn rhai_generate_into_module(m: &mut Module, flatten: bool) {
m.set_fn("increment", FnNamespace::Internal, FnAccess::Public, Some(increment_token::PARAM_NAMES),
m.set_plugin_fn("increment", FnNamespace::Internal, FnAccess::Public, Some(increment_token::PARAM_NAMES),
&[TypeId::of::<FLOAT>()],
increment_token().into());
increment_token());
if flatten {} else {}
}
#[allow(non_camel_case_types)]
@ -1154,9 +1154,9 @@ mod generate_tests {
}
#[allow(unused_mut)]
pub fn rhai_generate_into_module(m: &mut Module, flatten: bool) {
m.set_fn("increment", FnNamespace::Internal, FnAccess::Public, Some(increment_token::PARAM_NAMES),
m.set_plugin_fn("increment", FnNamespace::Internal, FnAccess::Public, Some(increment_token::PARAM_NAMES),
&[TypeId::of::<FLOAT>()],
increment_token().into());
increment_token());
if flatten {} else {}
}
#[allow(non_camel_case_types)]
@ -1237,9 +1237,9 @@ mod generate_tests {
}
#[allow(unused_mut)]
pub fn rhai_generate_into_module(m: &mut Module, flatten: bool) {
m.set_fn("increment", FnNamespace::Internal, FnAccess::Public, Some(increment_token::PARAM_NAMES),
m.set_plugin_fn("increment", FnNamespace::Internal, FnAccess::Public, Some(increment_token::PARAM_NAMES),
&[TypeId::of::<FLOAT>()],
increment_token().into());
increment_token());
if flatten {} else {}
}
#[allow(non_camel_case_types)]
@ -1319,9 +1319,9 @@ mod generate_tests {
}
#[allow(unused_mut)]
pub fn rhai_generate_into_module(m: &mut Module, flatten: bool) {
m.set_fn("get$square", FnNamespace::Global, FnAccess::Public, Some(int_foo_token::PARAM_NAMES),
m.set_plugin_fn("get$square", FnNamespace::Global, FnAccess::Public, Some(int_foo_token::PARAM_NAMES),
&[TypeId::of::<u64>()],
int_foo_token().into());
int_foo_token());
if flatten {} else {}
}
#[allow(non_camel_case_types)]
@ -1379,12 +1379,12 @@ mod generate_tests {
}
#[allow(unused_mut)]
pub fn rhai_generate_into_module(m: &mut Module, flatten: bool) {
m.set_fn("square", FnNamespace::Internal, FnAccess::Public, Some(int_foo_token::PARAM_NAMES),
m.set_plugin_fn("square", FnNamespace::Internal, FnAccess::Public, Some(int_foo_token::PARAM_NAMES),
&[TypeId::of::<u64>()],
int_foo_token().into());
m.set_fn("get$square", FnNamespace::Global, FnAccess::Public, Some(int_foo_token::PARAM_NAMES),
int_foo_token());
m.set_plugin_fn("get$square", FnNamespace::Global, FnAccess::Public, Some(int_foo_token::PARAM_NAMES),
&[TypeId::of::<u64>()],
int_foo_token().into());
int_foo_token());
if flatten {} else {}
}
#[allow(non_camel_case_types)]
@ -1442,9 +1442,9 @@ mod generate_tests {
}
#[allow(unused_mut)]
pub fn rhai_generate_into_module(m: &mut Module, flatten: bool) {
m.set_fn("set$squared", FnNamespace::Global, FnAccess::Public, Some(int_foo_token::PARAM_NAMES),
m.set_plugin_fn("set$squared", FnNamespace::Global, FnAccess::Public, Some(int_foo_token::PARAM_NAMES),
&[TypeId::of::<u64>(), TypeId::of::<u64>()],
int_foo_token().into());
int_foo_token());
if flatten {} else {}
}
#[allow(non_camel_case_types)]
@ -1503,12 +1503,12 @@ mod generate_tests {
}
#[allow(unused_mut)]
pub fn rhai_generate_into_module(m: &mut Module, flatten: bool) {
m.set_fn("set_sq", FnNamespace::Internal, FnAccess::Public, Some(int_foo_token::PARAM_NAMES),
m.set_plugin_fn("set_sq", FnNamespace::Internal, FnAccess::Public, Some(int_foo_token::PARAM_NAMES),
&[TypeId::of::<u64>(), TypeId::of::<u64>()],
int_foo_token().into());
m.set_fn("set$squared", FnNamespace::Global, FnAccess::Public, Some(int_foo_token::PARAM_NAMES),
int_foo_token());
m.set_plugin_fn("set$squared", FnNamespace::Global, FnAccess::Public, Some(int_foo_token::PARAM_NAMES),
&[TypeId::of::<u64>(), TypeId::of::<u64>()],
int_foo_token().into());
int_foo_token());
if flatten {} else {}
}
#[allow(non_camel_case_types)]
@ -1567,9 +1567,9 @@ mod generate_tests {
}
#[allow(unused_mut)]
pub fn rhai_generate_into_module(m: &mut Module, flatten: bool) {
m.set_fn("index$get$", FnNamespace::Global, FnAccess::Public, Some(get_by_index_token::PARAM_NAMES),
m.set_plugin_fn("index$get$", FnNamespace::Global, FnAccess::Public, Some(get_by_index_token::PARAM_NAMES),
&[TypeId::of::<MyCollection>(), TypeId::of::<u64>()],
get_by_index_token().into());
get_by_index_token());
if flatten {} else {}
}
#[allow(non_camel_case_types)]
@ -1628,12 +1628,12 @@ mod generate_tests {
}
#[allow(unused_mut)]
pub fn rhai_generate_into_module(m: &mut Module, flatten: bool) {
m.set_fn("get", FnNamespace::Internal, FnAccess::Public, Some(get_by_index_token::PARAM_NAMES),
m.set_plugin_fn("get", FnNamespace::Internal, FnAccess::Public, Some(get_by_index_token::PARAM_NAMES),
&[TypeId::of::<MyCollection>(), TypeId::of::<u64>()],
get_by_index_token().into());
m.set_fn("index$get$", FnNamespace::Global, FnAccess::Public, Some(get_by_index_token::PARAM_NAMES),
get_by_index_token());
m.set_plugin_fn("index$get$", FnNamespace::Global, FnAccess::Public, Some(get_by_index_token::PARAM_NAMES),
&[TypeId::of::<MyCollection>(), TypeId::of::<u64>()],
get_by_index_token().into());
get_by_index_token());
if flatten {} else {}
}
#[allow(non_camel_case_types)]
@ -1692,9 +1692,9 @@ mod generate_tests {
}
#[allow(unused_mut)]
pub fn rhai_generate_into_module(m: &mut Module, flatten: bool) {
m.set_fn("index$set$", FnNamespace::Global, FnAccess::Public, Some(set_by_index_token::PARAM_NAMES),
m.set_plugin_fn("index$set$", FnNamespace::Global, FnAccess::Public, Some(set_by_index_token::PARAM_NAMES),
&[TypeId::of::<MyCollection>(), TypeId::of::<u64>(), TypeId::of::<FLOAT>()],
set_by_index_token().into());
set_by_index_token());
if flatten {} else {}
}
#[allow(non_camel_case_types)]
@ -1754,12 +1754,12 @@ mod generate_tests {
}
#[allow(unused_mut)]
pub fn rhai_generate_into_module(m: &mut Module, flatten: bool) {
m.set_fn("set", FnNamespace::Internal, FnAccess::Public, Some(set_by_index_token::PARAM_NAMES),
m.set_plugin_fn("set", FnNamespace::Internal, FnAccess::Public, Some(set_by_index_token::PARAM_NAMES),
&[TypeId::of::<MyCollection>(), TypeId::of::<u64>(), TypeId::of::<FLOAT>()],
set_by_index_token().into());
m.set_fn("index$set$", FnNamespace::Global, FnAccess::Public, Some(set_by_index_token::PARAM_NAMES),
set_by_index_token());
m.set_plugin_fn("index$set$", FnNamespace::Global, FnAccess::Public, Some(set_by_index_token::PARAM_NAMES),
&[TypeId::of::<MyCollection>(), TypeId::of::<u64>(), TypeId::of::<FLOAT>()],
set_by_index_token().into());
set_by_index_token());
if flatten {} else {}
}
#[allow(non_camel_case_types)]

103
src/module/mod.rs
View File

@ -4,6 +4,7 @@ use crate::ast::{FnAccess, Ident};
use crate::dynamic::Variant;
use crate::fn_native::{shared_take_or_clone, CallableFunction, FnCallArgs, IteratorFn, SendSync};
use crate::fn_register::RegisterNativeFunction;
use crate::plugin::PluginFunction;
use crate::stdlib::{
any::TypeId,
boxed::Box,
@ -644,6 +645,24 @@ impl Module {
self
}
/// Remap type ID.
#[inline(always)]
fn map_type(map: bool, type_id: TypeId) -> TypeId {
if !map {
return type_id;
}
if type_id == TypeId::of::<&str>() {
// Map &str to ImmutableString
return TypeId::of::<ImmutableString>();
}
if type_id == TypeId::of::<String>() {
// Map String to ImmutableString
return TypeId::of::<ImmutableString>();
}
type_id
}
/// Set a Rust function into the [`Module`], returning a hash key.
///
/// If there is an existing Rust function of the same hash, it is replaced.
@ -663,31 +682,12 @@ impl Module {
) -> u64 {
let is_method = func.is_method();
let param_types = arg_types
let param_types: StaticVec<_> = arg_types
.iter()
.cloned()
.enumerate()
.map(|(i, type_id)| {
if !is_method || i > 0 {
if type_id == TypeId::of::<&str>() {
// Map &str to ImmutableString
TypeId::of::<ImmutableString>()
} else if type_id == TypeId::of::<String>() {
// Map String to ImmutableString
TypeId::of::<ImmutableString>()
} else {
type_id
}
} else {
// Do not map &mut parameter
type_id
}
})
.collect::<StaticVec<_>>();
let hash_fn = calc_native_fn_hash(empty(), &name, &param_types);
let name = self.interned_strings.get(name);
.map(|(i, type_id)| Self::map_type(!is_method || i > 0, type_id))
.collect();
#[cfg(feature = "metadata")]
let param_names = _arg_names
@ -696,10 +696,67 @@ impl Module {
.map(|&arg| self.interned_strings.get(arg))
.collect();
let hash_fn = calc_native_fn_hash(empty(), &name, &param_types);
self.functions.insert(
hash_fn,
Box::new(FuncInfo {
name,
name: self.interned_strings.get(name),
namespace,
access,
params: param_types.len(),
param_types,
#[cfg(feature = "metadata")]
param_names,
func,
}),
);
self.indexed = false;
self.contains_indexed_global_functions = false;
hash_fn
}
/// Set a plugin function into the [`Module`], returning a hash key.
///
/// If there is an existing Rust function of the same hash, it is replaced.
///
/// # WARNING - Low Level API
///
/// This function is very low level. It is intended for plugins system use only.
#[inline(always)]
pub fn set_plugin_fn(
&mut self,
name: impl AsRef<str> + Into<ImmutableString>,
namespace: FnNamespace,
access: FnAccess,
_arg_names: Option<&[&str]>,
arg_types: &[TypeId],
func: impl PluginFunction + 'static,
) -> u64 {
let is_method = func.is_method_call();
let param_types: StaticVec<_> = arg_types
.iter()
.cloned()
.enumerate()
.map(|(i, type_id)| Self::map_type(!is_method || i > 0, type_id))
.collect();
#[cfg(feature = "metadata")]
let param_names = _arg_names
.iter()
.flat_map(|p| p.iter())
.map(|&arg| self.interned_strings.get(arg))
.collect();
let hash_fn = calc_native_fn_hash(empty(), &name, &param_types);
self.functions.insert(
hash_fn,
Box::new(FuncInfo {
name: self.interned_strings.get(name),
namespace,
access,
params: param_types.len(),