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Implement callable and closure (#243)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| use core::ffi::c_void; | ||
| use std::cell::Ref; | ||
| // use std::ptr; | ||
|
|
||
| use libffi::{ | ||
| // low::{closure_alloc, ffi_cif, CodePtr, RawCallback}, | ||
| low::{ffi_cif, CodePtr}, | ||
| // middle::Cif, | ||
| // raw::ffi_prep_closure_loc, | ||
| }; | ||
| use mlua::prelude::*; | ||
|
|
||
| use super::{ | ||
| bit_mask::u8_test_not, ffi_native::NativeArgInfo, FfiRef, FfiRefFlag, GetNativeData, | ||
| NativeConvert, NativeData, | ||
| }; | ||
|
|
||
| // unsafe extern "C" fn callback() { | ||
| // _cif: ffi_cif, | ||
| // result: &mut | ||
| // } | ||
|
|
||
| // pub type RawCallback = unsafe extern "C" fn(cif: *mut ffi_cif, result: *mut c_void, args: *mut *mut c_void, userdata: *mut c_void); | ||
| // pub unsafe extern "C" fn ffi_prep_raw_closure( | ||
| // arg1: *mut ffi_raw_closure, | ||
| // cif: *mut ffi_cif, | ||
| // fun: Option<unsafe extern "C" fn(_: *mut ffi_cif, _: *mut c_void, _: *mut ffi_raw, _: *mut c_void)>, | ||
| // user_data: *mut c_void | ||
| // ) -> u32 | ||
|
|
||
| // pub fn ffi_prep_raw_closure_loc( | ||
| // arg1: *mut ffi_raw_closure, | ||
| // cif: *mut ffi_cif, | ||
| // fun: Option< | ||
| // unsafe extern "C" fn( | ||
| // arg1: *mut ffi_cif, | ||
| // arg2: *mut c_void, | ||
| // arg3: *mut ffi_raw, | ||
| // arg4: *mut c_void, | ||
| // ), | ||
| // >, | ||
| // user_data: *mut c_void, | ||
| // codeloc: *mut c_void, | ||
| // ) -> ffi_status; | ||
|
|
||
| pub struct FfiCallable { | ||
| cif: *mut ffi_cif, | ||
| arg_type_list: Vec<NativeArgInfo>, | ||
| result_size: usize, | ||
| code: CodePtr, | ||
| } | ||
|
|
||
| impl FfiCallable { | ||
| pub unsafe fn new( | ||
| cif: *mut ffi_cif, | ||
| arg_type_list: Vec<NativeArgInfo>, | ||
| result_size: usize, | ||
| function_ref: FfiRef, | ||
| ) -> LuaResult<Self> { | ||
| if u8_test_not(function_ref.flags, FfiRefFlag::Function.value()) { | ||
| return Err(LuaError::external("ref is not function pointer")); | ||
| } | ||
| Ok(Self { | ||
| cif, | ||
| arg_type_list, | ||
| result_size, | ||
| code: CodePtr::from_ptr(function_ref.get_pointer(0).cast::<c_void>()), | ||
| }) | ||
| } | ||
|
|
||
| pub unsafe fn call(&self, result: &Ref<dyn NativeData>, args: LuaMultiValue) -> LuaResult<()> { | ||
| result | ||
| .check_boundary(0, self.result_size) | ||
| .then_some(()) | ||
| .ok_or_else(|| LuaError::external("result boundary check failed")) | ||
| } | ||
| // pub fn new_from_lua_table(lua: &Lua, args: LuaTable, ret: LuaAnyUserData) -> LuaResult<Self> { | ||
| // let args_types = libffi_type_list_from_table(lua, &args)?; | ||
| // let ret_type = libffi_type_from_userdata(lua, &ret)?; | ||
|
|
||
| // Ok(Self::new( | ||
| // args_types, | ||
| // ret_type, | ||
| // unsafe { get_conv_list_from_table(&args)? }, | ||
| // unsafe { get_conv(&ret)? }, | ||
| // )) | ||
| // } | ||
| // pub fn call() { | ||
|
|
||
| // } | ||
| } | ||
|
|
||
| impl LuaUserData for FfiCallable { | ||
| fn add_methods<'lua, M: LuaUserDataMethods<'lua, Self>>(methods: &mut M) { | ||
| methods.add_method( | ||
| "call", | ||
| |_lua, this: &FfiCallable, mut args: LuaMultiValue| { | ||
| let LuaValue::UserData(result) = args.pop_front().ok_or_else(|| { | ||
| LuaError::external("first argument must be result data handle") | ||
| })? | ||
| else { | ||
| return Err(LuaError::external("")); | ||
| }; | ||
| let call_result = unsafe { this.call(&result.get_data_handle()?, args) }; | ||
| call_result | ||
| }, | ||
| ) | ||
| } | ||
| } |
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