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Move helper functions into chelper mod
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| use std::ptr::{self, null_mut}; | ||
|
|
||
| use libffi::{low, middle::Type, raw}; | ||
| use lune_utils::fmt::{pretty_format_value, ValueFormatConfig}; | ||
| use mlua::prelude::*; | ||
|
|
||
| use crate::carr::CArr; | ||
| use crate::cptr::CPtr; | ||
| use crate::cstruct::CStruct; | ||
| use crate::ctype::CType; | ||
| use crate::FFI_STATUS_NAMES; | ||
|
|
||
| // get Vec<libffi_type> from table(array) of c-types userdata | ||
| pub fn type_list_from_table(table: &LuaTable) -> LuaResult<Vec<Type>> { | ||
| let len: usize = table.raw_len(); | ||
| let mut fields = Vec::with_capacity(len); | ||
|
|
||
| for i in 0..len { | ||
| // Test required | ||
| let value = table.raw_get(i + 1)?; | ||
| match value { | ||
| LuaValue::UserData(field_type) => { | ||
| fields.push(type_from_userdata(&field_type)?); | ||
| } | ||
| _ => { | ||
| return Err(LuaError::external(format!( | ||
| "Unexpected field. CStruct, CType or CArr is required for element but got {}", | ||
| pretty_format_value(&value, &ValueFormatConfig::new()) | ||
| ))); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| Ok(fields) | ||
| } | ||
|
|
||
| // get libffi_type from any c-type userdata | ||
| pub fn type_from_userdata(userdata: &LuaAnyUserData) -> LuaResult<Type> { | ||
| if userdata.is::<CStruct>() { | ||
| Ok(userdata.borrow::<CStruct>()?.get_type()) | ||
| } else if userdata.is::<CType>() { | ||
| Ok(userdata.borrow::<CType>()?.get_type()) | ||
| } else if userdata.is::<CArr>() { | ||
| Ok(userdata.borrow::<CArr>()?.get_type()) | ||
| } else if userdata.is::<CPtr>() { | ||
| Ok(CPtr::get_type()) | ||
| } else { | ||
| Err(LuaError::external(format!( | ||
| "Unexpected field. CStruct, CType, CString or CArr is required for element but got {}", | ||
| pretty_format_value( | ||
| // Since the data is in the Lua location, | ||
| // there is no problem with the clone. | ||
| &LuaValue::UserData(userdata.to_owned()), | ||
| &ValueFormatConfig::new() | ||
| ) | ||
| ))) | ||
| } | ||
| } | ||
|
|
||
| // stringify any c-type userdata (for recursive) | ||
| pub fn stringify_userdata(userdata: &LuaAnyUserData) -> LuaResult<String> { | ||
| if userdata.is::<CType>() { | ||
| let name = userdata.borrow::<CType>()?.stringify(); | ||
| Ok(name) | ||
| } else if userdata.is::<CStruct>() { | ||
| let name = CStruct::stringify(userdata)?; | ||
| Ok(name) | ||
| } else if userdata.is::<CArr>() { | ||
| let name = CArr::stringify(userdata)?; | ||
| Ok(name) | ||
| } else if userdata.is::<CPtr>() { | ||
| let name: String = CPtr::stringify(userdata)?; | ||
| Ok(name) | ||
| } else { | ||
| Ok(String::from("unnamed")) | ||
| } | ||
| } | ||
|
|
||
| // get name tag for any c-type userdata | ||
| pub fn name_from_userdata(userdata: &LuaAnyUserData) -> String { | ||
| if userdata.is::<CStruct>() { | ||
| String::from("CStruct") | ||
| } else if userdata.is::<CType>() { | ||
| String::from("CType") | ||
| } else if userdata.is::<CArr>() { | ||
| String::from("CArr") | ||
| } else if userdata.is::<CPtr>() { | ||
| String::from("CPtr") | ||
| } else { | ||
| String::from("unnamed") | ||
| } | ||
| } | ||
|
|
||
| // Ensure sizeof c-type (raw::libffi_type) | ||
| // See: http://www.chiark.greenend.org.uk/doc/libffi-dev/html/Size-and-Alignment.html | ||
| pub fn get_ensured_size(ffi_type: *mut raw::ffi_type) -> LuaResult<usize> { | ||
| let mut cif = low::ffi_cif::default(); | ||
| let result = unsafe { | ||
| raw::ffi_prep_cif( | ||
| ptr::from_mut(&mut cif), | ||
| raw::ffi_abi_FFI_DEFAULT_ABI, | ||
| 0, | ||
| ffi_type, | ||
| null_mut(), | ||
| ) | ||
| }; | ||
|
|
||
| if result != raw::ffi_status_FFI_OK { | ||
| return Err(LuaError::external(format!( | ||
| "ffi_get_struct_offsets failed. expected result {}, got {}", | ||
| FFI_STATUS_NAMES[0], FFI_STATUS_NAMES[result as usize] | ||
| ))); | ||
| } | ||
| unsafe { Ok((*ffi_type).size) } | ||
| } |
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