+++ /dev/null
-//! Printing logic for basic blocks of Rust-mapped code - parts of functions and declarations but
-//! not the full mapping logic.
-
-use std::fs::File;
-use std::io::Write;
-use proc_macro2::{TokenTree, Span};
-
-use crate::types::*;
-
-/// Writes out a C++ wrapper class for the given type, which contains various utilities to access
-/// the underlying C-mapped type safely avoiding some common memory management issues by handling
-/// resource-freeing and prevending accidental raw copies.
-pub fn write_cpp_wrapper(cpp_header_file: &mut File, ty: &str, has_destructor: bool) {
- writeln!(cpp_header_file, "class {} {{", ty).unwrap();
- writeln!(cpp_header_file, "private:").unwrap();
- writeln!(cpp_header_file, "\tLDK{} self;", ty).unwrap();
- writeln!(cpp_header_file, "public:").unwrap();
- writeln!(cpp_header_file, "\t{}(const {}&) = delete;", ty, ty).unwrap();
- writeln!(cpp_header_file, "\t{}({}&& o) : self(o.self) {{ memset(&o, 0, sizeof({})); }}", ty, ty, ty).unwrap();
- writeln!(cpp_header_file, "\t{}(LDK{}&& m_self) : self(m_self) {{ memset(&m_self, 0, sizeof(LDK{})); }}", ty, ty, ty).unwrap();
- writeln!(cpp_header_file, "\toperator LDK{}() && {{ LDK{} res = self; memset(&self, 0, sizeof(LDK{})); return res; }}", ty, ty, ty).unwrap();
- if has_destructor {
- writeln!(cpp_header_file, "\t~{}() {{ {}_free(self); }}", ty, ty).unwrap();
- writeln!(cpp_header_file, "\t{}& operator=({}&& o) {{ {}_free(self); self = o.self; memset(&o, 0, sizeof({})); return *this; }}", ty, ty, ty, ty).unwrap();
- } else {
- writeln!(cpp_header_file, "\t{}& operator=({}&& o) {{ self = o.self; memset(&o, 0, sizeof({})); return *this; }}", ty, ty, ty).unwrap();
- }
- writeln!(cpp_header_file, "\tLDK{}* operator &() {{ return &self; }}", ty).unwrap();
- writeln!(cpp_header_file, "\tLDK{}* operator ->() {{ return &self; }}", ty).unwrap();
- writeln!(cpp_header_file, "\tconst LDK{}* operator &() const {{ return &self; }}", ty).unwrap();
- writeln!(cpp_header_file, "\tconst LDK{}* operator ->() const {{ return &self; }}", ty).unwrap();
- writeln!(cpp_header_file, "}};").unwrap();
-}
-
-/// Writes out a C-callable concrete Result<A, B> struct and utility methods
-pub fn write_result_block<W: std::io::Write>(w: &mut W, mangled_container: &str, ok_type: &str, err_type: &str, clonable: bool) {
- writeln!(w, "#[repr(C)]").unwrap();
- writeln!(w, "pub union {}Ptr {{", mangled_container).unwrap();
- if ok_type != "()" {
- writeln!(w, "\tpub result: *mut {},", ok_type).unwrap();
- } else {
- writeln!(w, "\t/// Note that this value is always NULL, as there are no contents in the OK variant").unwrap();
- writeln!(w, "\tpub result: *mut std::ffi::c_void,").unwrap();
- }
- if err_type != "()" {
- writeln!(w, "\tpub err: *mut {},", err_type).unwrap();
- } else {
- writeln!(w, "\t/// Note that this value is always NULL, as there are no contents in the Err variant").unwrap();
- writeln!(w, "\tpub err: *mut std::ffi::c_void,").unwrap();
- }
- writeln!(w, "}}").unwrap();
- writeln!(w, "#[repr(C)]").unwrap();
- writeln!(w, "pub struct {} {{", mangled_container).unwrap();
- writeln!(w, "\tpub contents: {}Ptr,", mangled_container).unwrap();
- writeln!(w, "\tpub result_ok: bool,").unwrap();
- writeln!(w, "}}").unwrap();
-
- writeln!(w, "#[no_mangle]").unwrap();
- if ok_type != "()" {
- writeln!(w, "pub extern \"C\" fn {}_ok(o: {}) -> {} {{", mangled_container, ok_type, mangled_container).unwrap();
- } else {
- writeln!(w, "pub extern \"C\" fn {}_ok() -> {} {{", mangled_container, mangled_container).unwrap();
- }
- writeln!(w, "\t{} {{", mangled_container).unwrap();
- writeln!(w, "\t\tcontents: {}Ptr {{", mangled_container).unwrap();
- if ok_type != "()" {
- writeln!(w, "\t\t\tresult: Box::into_raw(Box::new(o)),").unwrap();
- } else {
- writeln!(w, "\t\t\tresult: std::ptr::null_mut(),").unwrap();
- }
- writeln!(w, "\t\t}},").unwrap();
- writeln!(w, "\t\tresult_ok: true,").unwrap();
- writeln!(w, "\t}}").unwrap();
- writeln!(w, "}}").unwrap();
-
- writeln!(w, "#[no_mangle]").unwrap();
- if err_type != "()" {
- writeln!(w, "pub extern \"C\" fn {}_err(e: {}) -> {} {{", mangled_container, err_type, mangled_container).unwrap();
- } else {
- writeln!(w, "pub extern \"C\" fn {}_err() -> {} {{", mangled_container, mangled_container).unwrap();
- }
- writeln!(w, "\t{} {{", mangled_container).unwrap();
- writeln!(w, "\t\tcontents: {}Ptr {{", mangled_container).unwrap();
- if err_type != "()" {
- writeln!(w, "\t\t\terr: Box::into_raw(Box::new(e)),").unwrap();
- } else {
- writeln!(w, "\t\t\terr: std::ptr::null_mut(),").unwrap();
- }
- writeln!(w, "\t\t}},").unwrap();
- writeln!(w, "\t\tresult_ok: false,").unwrap();
- writeln!(w, "\t}}").unwrap();
- writeln!(w, "}}").unwrap();
-
- writeln!(w, "#[no_mangle]").unwrap();
- writeln!(w, "pub extern \"C\" fn {}_free(_res: {}) {{ }}", mangled_container, mangled_container).unwrap();
- writeln!(w, "impl Drop for {} {{", mangled_container).unwrap();
- writeln!(w, "\tfn drop(&mut self) {{").unwrap();
- writeln!(w, "\t\tif self.result_ok {{").unwrap();
- if ok_type != "()" {
- writeln!(w, "\t\t\tif unsafe {{ !(self.contents.result as *mut ()).is_null() }} {{").unwrap();
- writeln!(w, "\t\t\t\tlet _ = unsafe {{ Box::from_raw(self.contents.result) }};").unwrap();
- writeln!(w, "\t\t\t}}").unwrap();
- }
- writeln!(w, "\t\t}} else {{").unwrap();
- if err_type != "()" {
- writeln!(w, "\t\t\tif unsafe {{ !(self.contents.err as *mut ()).is_null() }} {{").unwrap();
- writeln!(w, "\t\t\t\tlet _ = unsafe {{ Box::from_raw(self.contents.err) }};").unwrap();
- writeln!(w, "\t\t\t}}").unwrap();
- }
- writeln!(w, "\t\t}}").unwrap();
- writeln!(w, "\t}}").unwrap();
- writeln!(w, "}}").unwrap();
-
- // TODO: Templates should use () now that they can, too
- let templ_ok_type = if ok_type != "()" { ok_type } else { "u8" };
- let templ_err_type = if err_type != "()" { err_type } else { "u8" };
-
- writeln!(w, "impl From<crate::c_types::CResultTempl<{}, {}>> for {} {{", templ_ok_type, templ_err_type, mangled_container).unwrap();
- writeln!(w, "\tfn from(mut o: crate::c_types::CResultTempl<{}, {}>) -> Self {{", templ_ok_type, templ_err_type).unwrap();
- writeln!(w, "\t\tlet contents = if o.result_ok {{").unwrap();
- if ok_type != "()" {
- writeln!(w, "\t\t\tlet result = unsafe {{ o.contents.result }};").unwrap();
- writeln!(w, "\t\t\tunsafe {{ o.contents.result = std::ptr::null_mut() }};").unwrap();
- writeln!(w, "\t\t\t{}Ptr {{ result }}", mangled_container).unwrap();
- } else {
- writeln!(w, "\t\t\tlet _ = unsafe {{ Box::from_raw(o.contents.result) }};").unwrap();
- writeln!(w, "\t\t\to.contents.result = std::ptr::null_mut();").unwrap();
- writeln!(w, "\t\t\t{}Ptr {{ result: std::ptr::null_mut() }}", mangled_container).unwrap();
- }
- writeln!(w, "\t\t}} else {{").unwrap();
- if err_type != "()" {
- writeln!(w, "\t\t\tlet err = unsafe {{ o.contents.err }};").unwrap();
- writeln!(w, "\t\t\tunsafe {{ o.contents.err = std::ptr::null_mut(); }}").unwrap();
- writeln!(w, "\t\t\t{}Ptr {{ err }}", mangled_container).unwrap();
- } else {
- writeln!(w, "\t\t\tlet _ = unsafe {{ Box::from_raw(o.contents.err) }};").unwrap();
- writeln!(w, "\t\t\to.contents.err = std::ptr::null_mut();").unwrap();
- writeln!(w, "\t\t\t{}Ptr {{ err: std::ptr::null_mut() }}", mangled_container).unwrap();
- }
- writeln!(w, "\t\t}};").unwrap();
- writeln!(w, "\t\tSelf {{").unwrap();
- writeln!(w, "\t\t\tcontents,").unwrap();
- writeln!(w, "\t\t\tresult_ok: o.result_ok,").unwrap();
- writeln!(w, "\t\t}}").unwrap();
- writeln!(w, "\t}}").unwrap();
- writeln!(w, "}}").unwrap();
-
- if clonable {
- writeln!(w, "impl Clone for {} {{", mangled_container).unwrap();
- writeln!(w, "\tfn clone(&self) -> Self {{").unwrap();
- writeln!(w, "\t\tif self.result_ok {{").unwrap();
- writeln!(w, "\t\t\tSelf {{ result_ok: true, contents: {}Ptr {{", mangled_container).unwrap();
- if ok_type != "()" {
- writeln!(w, "\t\t\t\tresult: Box::into_raw(Box::new(<{}>::clone(unsafe {{ &*self.contents.result }})))", ok_type).unwrap();
- } else {
- writeln!(w, "\t\t\t\tresult: std::ptr::null_mut()").unwrap();
- }
- writeln!(w, "\t\t\t}} }}").unwrap();
- writeln!(w, "\t\t}} else {{").unwrap();
- writeln!(w, "\t\t\tSelf {{ result_ok: false, contents: {}Ptr {{", mangled_container).unwrap();
- if err_type != "()" {
- writeln!(w, "\t\t\t\terr: Box::into_raw(Box::new(<{}>::clone(unsafe {{ &*self.contents.err }})))", err_type).unwrap();
- } else {
- writeln!(w, "\t\t\t\terr: std::ptr::null_mut()").unwrap();
- }
- writeln!(w, "\t\t\t}} }}").unwrap();
- writeln!(w, "\t\t}}").unwrap();
- writeln!(w, "\t}}").unwrap();
- writeln!(w, "}}").unwrap();
- writeln!(w, "#[no_mangle]").unwrap();
- writeln!(w, "pub extern \"C\" fn {}_clone(orig: &{}) -> {} {{ orig.clone() }}", mangled_container, mangled_container, mangled_container).unwrap();
- }
-}
-
-/// Writes out a C-callable concrete Vec<A> struct and utility methods
-pub fn write_vec_block<W: std::io::Write>(w: &mut W, mangled_container: &str, inner_type: &str, clonable: bool) {
- writeln!(w, "#[repr(C)]").unwrap();
- writeln!(w, "pub struct {} {{", mangled_container).unwrap();
- writeln!(w, "\tpub data: *mut {},", inner_type).unwrap();
- writeln!(w, "\tpub datalen: usize").unwrap();
- writeln!(w, "}}").unwrap();
-
- writeln!(w, "impl {} {{", mangled_container).unwrap();
- writeln!(w, "\t#[allow(unused)] pub(crate) fn into_rust(&mut self) -> Vec<{}> {{", inner_type).unwrap();
- writeln!(w, "\t\tif self.datalen == 0 {{ return Vec::new(); }}").unwrap();
- writeln!(w, "\t\tlet ret = unsafe {{ Box::from_raw(std::slice::from_raw_parts_mut(self.data, self.datalen)) }}.into();").unwrap();
- writeln!(w, "\t\tself.data = std::ptr::null_mut();").unwrap();
- writeln!(w, "\t\tself.datalen = 0;").unwrap();
- writeln!(w, "\t\tret").unwrap();
- writeln!(w, "\t}}").unwrap();
- writeln!(w, "\t#[allow(unused)] pub(crate) fn as_slice(&self) -> &[{}] {{", inner_type).unwrap();
- writeln!(w, "\t\tunsafe {{ std::slice::from_raw_parts_mut(self.data, self.datalen) }}").unwrap();
- writeln!(w, "\t}}").unwrap();
- writeln!(w, "}}").unwrap();
-
- writeln!(w, "impl From<Vec<{}>> for {} {{", inner_type, mangled_container).unwrap();
- writeln!(w, "\tfn from(v: Vec<{}>) -> Self {{", inner_type).unwrap();
- writeln!(w, "\t\tlet datalen = v.len();").unwrap();
- writeln!(w, "\t\tlet data = Box::into_raw(v.into_boxed_slice());").unwrap();
- writeln!(w, "\t\tSelf {{ datalen, data: unsafe {{ (*data).as_mut_ptr() }} }}").unwrap();
- writeln!(w, "\t}}").unwrap();
- writeln!(w, "}}").unwrap();
-
- writeln!(w, "#[no_mangle]").unwrap();
- writeln!(w, "pub extern \"C\" fn {}_free(_res: {}) {{ }}", mangled_container, mangled_container).unwrap();
- writeln!(w, "impl Drop for {} {{", mangled_container).unwrap();
- writeln!(w, "\tfn drop(&mut self) {{").unwrap();
- writeln!(w, "\t\tif self.datalen == 0 {{ return; }}").unwrap();
- writeln!(w, "\t\tunsafe {{ Box::from_raw(std::slice::from_raw_parts_mut(self.data, self.datalen)) }};").unwrap();
- writeln!(w, "\t}}").unwrap();
- writeln!(w, "}}").unwrap();
- if clonable {
- writeln!(w, "impl Clone for {} {{", mangled_container).unwrap();
- writeln!(w, "\tfn clone(&self) -> Self {{").unwrap();
- writeln!(w, "\t\tlet mut res = Vec::new();").unwrap();
- writeln!(w, "\t\tif self.datalen == 0 {{ return Self::from(res); }}").unwrap();
- writeln!(w, "\t\tres.extend_from_slice(unsafe {{ std::slice::from_raw_parts_mut(self.data, self.datalen) }});").unwrap();
- writeln!(w, "\t\tSelf::from(res)").unwrap();
- writeln!(w, "\t}}").unwrap();
- writeln!(w, "}}").unwrap();
- }
-}
-
-/// Writes out a C-callable concrete (A, B, ...) struct and utility methods
-pub fn write_tuple_block<W: std::io::Write>(w: &mut W, mangled_container: &str, types: &[String], clonable: bool) {
- writeln!(w, "#[repr(C)]").unwrap();
- writeln!(w, "pub struct {} {{", mangled_container).unwrap();
- for (idx, ty) in types.iter().enumerate() {
- writeln!(w, "\tpub {}: {},", ('a' as u8 + idx as u8) as char, ty).unwrap();
- }
- writeln!(w, "}}").unwrap();
-
- let mut tuple_str = "(".to_owned();
- for (idx, ty) in types.iter().enumerate() {
- if idx != 0 { tuple_str += ", "; }
- tuple_str += ty;
- }
- tuple_str += ")";
-
- writeln!(w, "impl From<{}> for {} {{", tuple_str, mangled_container).unwrap();
- writeln!(w, "\tfn from (tup: {}) -> Self {{", tuple_str).unwrap();
- writeln!(w, "\t\tSelf {{").unwrap();
- for idx in 0..types.len() {
- writeln!(w, "\t\t\t{}: tup.{},", ('a' as u8 + idx as u8) as char, idx).unwrap();
- }
- writeln!(w, "\t\t}}").unwrap();
- writeln!(w, "\t}}").unwrap();
- writeln!(w, "}}").unwrap();
- writeln!(w, "impl {} {{", mangled_container).unwrap();
- writeln!(w, "\t#[allow(unused)] pub(crate) fn to_rust(mut self) -> {} {{", tuple_str).unwrap();
- write!(w, "\t\t(").unwrap();
- for idx in 0..types.len() {
- write!(w, "{}self.{}", if idx != 0 {", "} else {""}, ('a' as u8 + idx as u8) as char).unwrap();
- }
- writeln!(w, ")").unwrap();
- writeln!(w, "\t}}").unwrap();
- writeln!(w, "}}").unwrap();
-
- if clonable {
- writeln!(w, "impl Clone for {} {{", mangled_container).unwrap();
- writeln!(w, "\tfn clone(&self) -> Self {{").unwrap();
- writeln!(w, "\t\tSelf {{").unwrap();
- for idx in 0..types.len() {
- writeln!(w, "\t\t\t{}: self.{}.clone(),", ('a' as u8 + idx as u8) as char, ('a' as u8 + idx as u8) as char).unwrap();
- }
- writeln!(w, "\t\t}}").unwrap();
- writeln!(w, "\t}}").unwrap();
- writeln!(w, "}}").unwrap();
- writeln!(w, "#[no_mangle]").unwrap();
- writeln!(w, "pub extern \"C\" fn {}_clone(orig: &{}) -> {} {{ orig.clone() }}", mangled_container, mangled_container, mangled_container).unwrap();
- }
-
- write!(w, "#[no_mangle]\npub extern \"C\" fn {}_new(", mangled_container).unwrap();
- for (idx, gen) in types.iter().enumerate() {
- write!(w, "{}{}: ", if idx != 0 { ", " } else { "" }, ('a' as u8 + idx as u8) as char).unwrap();
- //if !self.write_c_type_intern(&mut created_container, gen, generics, false, false, false) { return false; }
- write!(w, "{}", gen).unwrap();
- }
- writeln!(w, ") -> {} {{", mangled_container).unwrap();
- write!(w, "\t{} {{ ", mangled_container).unwrap();
- for idx in 0..types.len() {
- write!(w, "{}, ", ('a' as u8 + idx as u8) as char).unwrap();
- }
- writeln!(w, "}}\n}}\n").unwrap();
-
- writeln!(w, "#[no_mangle]").unwrap();
- writeln!(w, "pub extern \"C\" fn {}_free(_res: {}) {{ }}", mangled_container, mangled_container).unwrap();
-}
-
-/// Prints the docs from a given attribute list unless its tagged no export
-pub fn writeln_docs<W: std::io::Write>(w: &mut W, attrs: &[syn::Attribute], prefix: &str) {
- for attr in attrs.iter() {
- let tokens_clone = attr.tokens.clone();
- let mut token_iter = tokens_clone.into_iter();
- if let Some(token) = token_iter.next() {
- match token {
- TokenTree::Punct(c) if c.as_char() == '=' => {
- // syn gets '=' from '///' or '//!' as it is syntax for #[doc = ""]
- },
- TokenTree::Group(_) => continue, // eg #[derive()]
- _ => unimplemented!(),
- }
- } else { continue; }
- match attr.style {
- syn::AttrStyle::Inner(_) => {
- match token_iter.next().unwrap() {
- TokenTree::Literal(lit) => {
- // Drop the first and last chars from lit as they are always "
- let doc = format!("{}", lit);
- writeln!(w, "{}//!{}", prefix, &doc[1..doc.len() - 1]).unwrap();
- },
- _ => unimplemented!(),
- }
- },
- syn::AttrStyle::Outer => {
- match token_iter.next().unwrap() {
- TokenTree::Literal(lit) => {
- // Drop the first and last chars from lit as they are always "
- let doc = format!("{}", lit);
- writeln!(w, "{}///{}", prefix, &doc[1..doc.len() - 1]).unwrap();
- },
- _ => unimplemented!(),
- }
- },
- }
- }
-}
-
-/// Print the parameters in a method declaration, starting after the open parenthesis, through and
-/// including the closing parenthesis and return value, but not including the open bracket or any
-/// trailing semicolons.
-///
-/// Usable both for a function definition and declaration.
-///
-/// this_param is used when returning Self or accepting a self parameter, and should be the
-/// concrete, mapped type.
-pub fn write_method_params<W: std::io::Write>(w: &mut W, sig: &syn::Signature, this_param: &str, types: &mut TypeResolver, generics: Option<&GenericTypes>, self_ptr: bool, fn_decl: bool) {
- if sig.constness.is_some() || sig.asyncness.is_some() || sig.unsafety.is_some() ||
- sig.abi.is_some() || sig.variadic.is_some() {
- unimplemented!();
- }
- if sig.generics.lt_token.is_some() {
- for generic in sig.generics.params.iter() {
- match generic {
- syn::GenericParam::Type(_)|syn::GenericParam::Lifetime(_) => {
- // We ignore these, if they're not on skipped args, we'll blow up
- // later, and lifetimes we just hope the C client enforces.
- },
- _ => unimplemented!(),
- }
- }
- }
-
- let mut first_arg = true;
- let mut num_unused = 0;
- for inp in sig.inputs.iter() {
- match inp {
- syn::FnArg::Receiver(recv) => {
- if !recv.attrs.is_empty() || recv.reference.is_none() { unimplemented!(); }
- write!(w, "this_arg: {}{}",
- match (self_ptr, recv.mutability.is_some()) {
- (true, true) => "*mut ",
- (true, false) => "*const ",
- (false, true) => "&mut ",
- (false, false) => "&",
- }, this_param).unwrap();
- assert!(first_arg);
- first_arg = false;
- },
- syn::FnArg::Typed(arg) => {
- if types.skip_arg(&*arg.ty, generics) { continue; }
- if !arg.attrs.is_empty() { unimplemented!(); }
- // First get the c type so that we can check if it ends up being a reference:
- let mut c_type = Vec::new();
- types.write_c_type(&mut c_type, &*arg.ty, generics, false);
- match &*arg.pat {
- syn::Pat::Ident(ident) => {
- if !ident.attrs.is_empty() || ident.subpat.is_some() {
- unimplemented!();
- }
- write!(w, "{}{}{}: ", if first_arg { "" } else { ", " }, if !fn_decl || c_type[0] == '&' as u8 || c_type[0] == '*' as u8 { "" } else { "mut " }, ident.ident).unwrap();
- first_arg = false;
- },
- syn::Pat::Wild(wild) => {
- if !wild.attrs.is_empty() { unimplemented!(); }
- write!(w, "{}unused_{}: ", if first_arg { "" } else { ", " }, num_unused).unwrap();
- num_unused += 1;
- },
- _ => unimplemented!(),
- }
- w.write(&c_type).unwrap();
- }
- }
- }
- write!(w, ")").unwrap();
- match &sig.output {
- syn::ReturnType::Type(_, rtype) => {
- write!(w, " -> ").unwrap();
- if let Some(mut remaining_path) = first_seg_self(&*rtype) {
- if remaining_path.next().is_none() {
- write!(w, "{}", this_param).unwrap();
- return;
- }
- }
- if let syn::Type::Reference(r) = &**rtype {
- // We can't return a reference, cause we allocate things on the stack.
- types.write_c_type(w, &*r.elem, generics, true);
- } else {
- types.write_c_type(w, &*rtype, generics, true);
- }
- },
- _ => {},
- }
-}
-
-/// Print the main part of a method declaration body, starting with a newline after the function
-/// open bracket and converting each function parameter to or from C-mapped types. Ends with "let
-/// mut ret = " assuming the next print will be the unmapped Rust function to call followed by the
-/// parameters we mapped to/from C here.
-pub fn write_method_var_decl_body<W: std::io::Write>(w: &mut W, sig: &syn::Signature, extra_indent: &str, types: &TypeResolver, generics: Option<&GenericTypes>, to_c: bool) {
- let mut num_unused = 0;
- for inp in sig.inputs.iter() {
- match inp {
- syn::FnArg::Receiver(_) => {},
- syn::FnArg::Typed(arg) => {
- if types.skip_arg(&*arg.ty, generics) { continue; }
- if !arg.attrs.is_empty() { unimplemented!(); }
- macro_rules! write_new_var {
- ($ident: expr, $ty: expr) => {
- if to_c {
- if types.write_to_c_conversion_new_var(w, &$ident, &$ty, generics, false) {
- write!(w, "\n\t{}", extra_indent).unwrap();
- }
- } else {
- if types.write_from_c_conversion_new_var(w, &$ident, &$ty, generics) {
- write!(w, "\n\t{}", extra_indent).unwrap();
- }
- }
- }
- }
- match &*arg.pat {
- syn::Pat::Ident(ident) => {
- if !ident.attrs.is_empty() || ident.subpat.is_some() {
- unimplemented!();
- }
- write_new_var!(ident.ident, *arg.ty);
- },
- syn::Pat::Wild(w) => {
- if !w.attrs.is_empty() { unimplemented!(); }
- write_new_var!(syn::Ident::new(&format!("unused_{}", num_unused), Span::call_site()), *arg.ty);
- num_unused += 1;
- },
- _ => unimplemented!(),
- }
- }
- }
- }
- match &sig.output {
- syn::ReturnType::Type(_, _) => {
- write!(w, "let mut ret = ").unwrap();
- },
- _ => {},
- }
-}
-
-/// Prints the parameters in a method call, starting after the open parenthesis and ending with a
-/// final return statement returning the method's result. Should be followed by a single closing
-/// bracket.
-///
-/// The return value is expected to be bound to a variable named `ret` which is available after a
-/// method-call-ending semicolon.
-pub fn write_method_call_params<W: std::io::Write>(w: &mut W, sig: &syn::Signature, extra_indent: &str, types: &TypeResolver, generics: Option<&GenericTypes>, this_type: &str, to_c: bool) {
- let mut first_arg = true;
- let mut num_unused = 0;
- for inp in sig.inputs.iter() {
- match inp {
- syn::FnArg::Receiver(recv) => {
- if !recv.attrs.is_empty() || recv.reference.is_none() { unimplemented!(); }
- if to_c {
- write!(w, "self.this_arg").unwrap();
- first_arg = false;
- }
- },
- syn::FnArg::Typed(arg) => {
- if types.skip_arg(&*arg.ty, generics) {
- if !to_c {
- if !first_arg {
- write!(w, ", ").unwrap();
- }
- first_arg = false;
- types.no_arg_to_rust(w, &*arg.ty, generics);
- }
- continue;
- }
- if !arg.attrs.is_empty() { unimplemented!(); }
- macro_rules! write_ident {
- ($ident: expr) => {
- if !first_arg {
- write!(w, ", ").unwrap();
- }
- first_arg = false;
- if to_c {
- types.write_to_c_conversion_inline_prefix(w, &*arg.ty, generics, false);
- write!(w, "{}", $ident).unwrap();
- types.write_to_c_conversion_inline_suffix(w, &*arg.ty, generics, false);
- } else {
- types.write_from_c_conversion_prefix(w, &*arg.ty, generics);
- write!(w, "{}", $ident).unwrap();
- types.write_from_c_conversion_suffix(w, &*arg.ty, generics);
- }
- }
- }
- match &*arg.pat {
- syn::Pat::Ident(ident) => {
- if !ident.attrs.is_empty() || ident.subpat.is_some() {
- unimplemented!();
- }
- write_ident!(ident.ident);
- },
- syn::Pat::Wild(w) => {
- if !w.attrs.is_empty() { unimplemented!(); }
- write_ident!(format!("unused_{}", num_unused));
- num_unused += 1;
- },
- _ => unimplemented!(),
- }
- }
- }
- }
- write!(w, ")").unwrap();
- match &sig.output {
- syn::ReturnType::Type(_, rtype) => {
- write!(w, ";\n\t{}", extra_indent).unwrap();
-
- let self_segs_iter = first_seg_self(&*rtype);
- if to_c && first_seg_self(&*rtype).is_some() {
- // Assume rather blindly that we're returning an associated trait from a C fn call to a Rust trait object.
- write!(w, "ret").unwrap();
- } else if !to_c && self_segs_iter.is_some() && self_segs_iter.unwrap().next().is_none() {
- // If we're returning "Self" (and not "Self::X"), just do it manually
- write!(w, "{} {{ inner: Box::into_raw(Box::new(ret)), is_owned: true }}", this_type).unwrap();
- } else if to_c {
- let new_var = types.write_from_c_conversion_new_var(w, &syn::Ident::new("ret", Span::call_site()), rtype, generics);
- if new_var {
- write!(w, "\n\t{}", extra_indent).unwrap();
- }
- types.write_from_c_conversion_prefix(w, &*rtype, generics);
- write!(w, "ret").unwrap();
- types.write_from_c_conversion_suffix(w, &*rtype, generics);
- } else {
- let ret_returned = if let syn::Type::Reference(_) = &**rtype { true } else { false };
- let new_var = types.write_to_c_conversion_new_var(w, &syn::Ident::new("ret", Span::call_site()), &rtype, generics, true);
- if new_var {
- write!(w, "\n\t{}", extra_indent).unwrap();
- }
- types.write_to_c_conversion_inline_prefix(w, &rtype, generics, true);
- write!(w, "{}ret", if ret_returned && !new_var { "*" } else { "" }).unwrap();
- types.write_to_c_conversion_inline_suffix(w, &rtype, generics, true);
- }
- }
- _ => {},
- }
-}
-
-/// Prints concrete generic parameters for a struct/trait/function, including the less-than and
-/// greater-than symbols, if any generic parameters are defined.
-pub fn maybe_write_generics<W: std::io::Write>(w: &mut W, generics: &syn::Generics, types: &TypeResolver, concrete_lifetimes: bool) {
- let mut gen_types = GenericTypes::new();
- assert!(gen_types.learn_generics(generics, types));
- if !generics.params.is_empty() {
- write!(w, "<").unwrap();
- for (idx, generic) in generics.params.iter().enumerate() {
- match generic {
- syn::GenericParam::Type(type_param) => {
- let mut printed_param = false;
- for bound in type_param.bounds.iter() {
- if let syn::TypeParamBound::Trait(trait_bound) = bound {
- assert_simple_bound(&trait_bound);
- write!(w, "{}{}", if idx != 0 { ", " } else { "" }, gen_types.maybe_resolve_ident(&type_param.ident).unwrap()).unwrap();
- if printed_param {
- unimplemented!("Can't print generic params that have multiple non-lifetime bounds");
- }
- printed_param = true;
- }
- }
- },
- syn::GenericParam::Lifetime(lt) => {
- if concrete_lifetimes {
- write!(w, "'static").unwrap();
- } else {
- write!(w, "{}'{}", if idx != 0 { ", " } else { "" }, lt.lifetime.ident).unwrap();
- }
- },
- _ => unimplemented!(),
- }
- }
- write!(w, ">").unwrap();
- }
-}
-
-
projects / rust-lightning / blobdiff