mirror of
https://github.com/topjohnwu/cxx.git
synced 2024-11-24 04:20:02 +00:00
648 lines
20 KiB
Rust
648 lines
20 KiB
Rust
use crate::gen::include;
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use crate::gen::out::OutFile;
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use crate::syntax::atom::Atom::{self, *};
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use crate::syntax::{Api, ExternFn, Struct, Type, Types, Var};
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use proc_macro2::Ident;
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pub(super) fn gen(namespace: Vec<String>, apis: &[Api], types: &Types, header: bool) -> OutFile {
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let mut out_file = OutFile::new(namespace.clone(), header);
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let out = &mut out_file;
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if header {
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writeln!(out, "#pragma once");
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}
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for api in apis {
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if let Api::Include(include) = api {
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out.include.insert(include.value());
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}
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}
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write_includes(out, types);
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write_include_cxxbridge(out, apis, types);
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out.next_section();
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for name in &namespace {
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writeln!(out, "namespace {} {{", name);
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}
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out.next_section();
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for api in apis {
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match api {
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Api::Struct(strct) => write_struct_decl(out, &strct.ident),
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Api::CxxType(ety) => write_struct_using(out, &ety.ident),
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Api::RustType(ety) => write_struct_decl(out, &ety.ident),
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_ => {}
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}
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}
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for api in apis {
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if let Api::Struct(strct) = api {
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out.next_section();
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write_struct(out, strct);
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}
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}
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if !header {
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out.begin_block("extern \"C\"");
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for api in apis {
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let (efn, write): (_, fn(_, _, _)) = match api {
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Api::CxxFunction(efn) => (efn, write_cxx_function_shim),
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Api::RustFunction(efn) => (efn, write_rust_function_decl),
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_ => continue,
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};
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out.next_section();
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write(out, efn, types);
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}
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out.end_block("extern \"C\"");
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}
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for api in apis {
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if let Api::RustFunction(efn) = api {
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out.next_section();
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write_rust_function_shim(out, efn, types);
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}
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}
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out.next_section();
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for name in namespace.iter().rev() {
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writeln!(out, "}} // namespace {}", name);
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}
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if !header {
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out.next_section();
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write_generic_instantiations(out, types);
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}
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out.prepend(out.include.to_string());
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out_file
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}
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fn write_includes(out: &mut OutFile, types: &Types) {
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for ty in types {
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match ty {
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Type::Ident(ident) => match Atom::from(ident) {
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Some(U8) | Some(U16) | Some(U32) | Some(U64) | Some(Usize) | Some(I8)
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| Some(I16) | Some(I32) | Some(I64) | Some(Isize) => out.include.cstdint = true,
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Some(CxxString) => out.include.string = true,
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Some(Bool) | Some(F32) | Some(F64) | Some(RustString) | None => {}
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},
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Type::RustBox(_) => out.include.type_traits = true,
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Type::UniquePtr(_) => out.include.memory = true,
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_ => {}
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}
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}
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}
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fn write_include_cxxbridge(out: &mut OutFile, apis: &[Api], types: &Types) {
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let mut needs_rust_box = false;
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for ty in types {
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if let Type::RustBox(_) = ty {
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needs_rust_box = true;
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break;
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}
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}
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let mut needs_manually_drop = false;
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let mut needs_maybe_uninit = false;
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for api in apis {
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if let Api::RustFunction(efn) = api {
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for arg in &efn.args {
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if arg.ty != RustString && types.needs_indirect_abi(&arg.ty) {
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needs_manually_drop = true;
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break;
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}
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}
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if let Some(ret) = &efn.ret {
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if types.needs_indirect_abi(ret) {
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needs_maybe_uninit = true;
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}
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}
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}
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}
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out.begin_block("namespace rust");
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out.begin_block("inline namespace cxxbridge02");
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if needs_rust_box || needs_manually_drop || needs_maybe_uninit {
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writeln!(out, "// #include \"rust/cxx.h\"");
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}
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if needs_rust_box {
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out.next_section();
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for line in include::get("CXXBRIDGE02_RUST_BOX").lines() {
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if !line.trim_start().starts_with("//") {
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writeln!(out, "{}", line);
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}
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}
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}
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if needs_manually_drop {
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out.next_section();
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writeln!(out, "template <typename T>");
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writeln!(out, "union ManuallyDrop {{");
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writeln!(out, " T value;");
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writeln!(
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out,
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" ManuallyDrop(T &&value) : value(::std::move(value)) {{}}",
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);
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writeln!(out, " ~ManuallyDrop() {{}}");
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writeln!(out, "}};");
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}
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if needs_maybe_uninit {
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out.next_section();
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writeln!(out, "template <typename T>");
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writeln!(out, "union MaybeUninit {{");
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writeln!(out, " T value;");
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writeln!(out, " MaybeUninit() {{}}");
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writeln!(out, " ~MaybeUninit() {{}}");
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writeln!(out, "}};");
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}
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out.end_block("namespace cxxbridge02");
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out.end_block("namespace rust");
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}
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fn write_struct(out: &mut OutFile, strct: &Struct) {
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for line in strct.doc.to_string().lines() {
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writeln!(out, "//{}", line);
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}
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writeln!(out, "struct {} final {{", strct.ident);
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for field in &strct.fields {
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write!(out, " ");
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write_type_space(out, &field.ty);
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writeln!(out, "{};", field.ident);
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}
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writeln!(out, "}};");
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}
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fn write_struct_decl(out: &mut OutFile, ident: &Ident) {
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writeln!(out, "struct {};", ident);
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}
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fn write_struct_using(out: &mut OutFile, ident: &Ident) {
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writeln!(out, "using {} = {};", ident, ident);
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}
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fn write_cxx_function_shim(out: &mut OutFile, efn: &ExternFn, types: &Types) {
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write_extern_return_type(out, &efn.ret, types);
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for name in out.namespace.clone() {
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write!(out, "{}$", name);
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}
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write!(out, "cxxbridge02${}(", efn.ident);
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for (i, arg) in efn.args.iter().enumerate() {
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if i > 0 {
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write!(out, ", ");
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}
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if arg.ty == RustString {
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write!(out, "const ");
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}
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write_extern_arg(out, arg, types);
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}
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let indirect_return = indirect_return(efn, types);
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if indirect_return {
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if !efn.args.is_empty() {
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write!(out, ", ");
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}
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write_return_type(out, &efn.ret);
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write!(out, "*return$");
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}
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writeln!(out, ") noexcept {{");
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write!(out, " ");
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write_return_type(out, &efn.ret);
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write!(out, "(*{}$)(", efn.ident);
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for (i, arg) in efn.args.iter().enumerate() {
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if i > 0 {
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write!(out, ", ");
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}
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write_type(out, &arg.ty);
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}
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writeln!(out, ") = {};", efn.ident);
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write!(out, " ");
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if indirect_return {
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write!(out, "new (return$) ");
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write_type(out, efn.ret.as_ref().unwrap());
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write!(out, "(");
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} else if let Some(ret) = &efn.ret {
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write!(out, "return ");
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match ret {
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Type::Ref(_) => write!(out, "&"),
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Type::Str(_) => write!(out, "::rust::Str::Repr("),
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_ => {}
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}
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}
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write!(out, "{}$(", efn.ident);
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for (i, arg) in efn.args.iter().enumerate() {
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if i > 0 {
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write!(out, ", ");
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}
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if let Type::RustBox(_) = &arg.ty {
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write_type(out, &arg.ty);
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write!(out, "::from_raw({})", arg.ident);
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} else if let Type::UniquePtr(_) = &arg.ty {
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write_type(out, &arg.ty);
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write!(out, "({})", arg.ident);
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} else if arg.ty == RustString {
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write!(
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out,
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"::rust::String(::rust::unsafe_bitcopy, *{})",
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arg.ident,
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);
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} else if types.needs_indirect_abi(&arg.ty) {
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write!(out, "::std::move(*{})", arg.ident);
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} else {
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write!(out, "{}", arg.ident);
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}
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}
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write!(out, ")");
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match &efn.ret {
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Some(Type::RustBox(_)) => write!(out, ".into_raw()"),
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Some(Type::UniquePtr(_)) => write!(out, ".release()"),
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Some(Type::Str(_)) => write!(out, ")"),
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_ => {}
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}
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if indirect_return {
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write!(out, ")");
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}
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writeln!(out, ";");
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writeln!(out, "}}");
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}
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fn write_rust_function_decl(out: &mut OutFile, efn: &ExternFn, types: &Types) {
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if efn.throws {
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write!(out, "::rust::Str::Repr ");
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} else {
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write_extern_return_type(out, &efn.ret, types);
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}
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for name in out.namespace.clone() {
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write!(out, "{}$", name);
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}
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write!(out, "cxxbridge02${}(", efn.ident);
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for (i, arg) in efn.args.iter().enumerate() {
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if i > 0 {
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write!(out, ", ");
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}
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write_extern_arg(out, arg, types);
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}
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if indirect_return(efn, types) {
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if !efn.args.is_empty() {
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write!(out, ", ");
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}
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write_return_type(out, &efn.ret);
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write!(out, "*return$");
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}
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writeln!(out, ") noexcept;");
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}
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fn write_rust_function_shim(out: &mut OutFile, efn: &ExternFn, types: &Types) {
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for line in efn.doc.to_string().lines() {
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writeln!(out, "//{}", line);
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}
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write_return_type(out, &efn.ret);
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write!(out, "{}(", efn.ident);
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for (i, arg) in efn.args.iter().enumerate() {
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if i > 0 {
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write!(out, ", ");
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}
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write_type_space(out, &arg.ty);
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write!(out, "{}", arg.ident);
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}
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write!(out, ")");
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if !efn.throws {
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write!(out, " noexcept");
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}
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if out.header {
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writeln!(out, ";");
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} else {
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writeln!(out, " {{");
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for arg in &efn.args {
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if arg.ty != RustString && types.needs_indirect_abi(&arg.ty) {
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write!(out, " ::rust::ManuallyDrop<");
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write_type(out, &arg.ty);
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writeln!(out, "> {}$(::std::move({0}));", arg.ident);
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}
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}
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write!(out, " ");
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let indirect_return = indirect_return(efn, types);
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if indirect_return {
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write!(out, "::rust::MaybeUninit<");
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write_type(out, efn.ret.as_ref().unwrap());
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writeln!(out, "> return$;");
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write!(out, " ");
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} else if let Some(ret) = &efn.ret {
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write!(out, "return ");
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match ret {
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Type::RustBox(_) => {
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write_type(out, ret);
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write!(out, "::from_raw(");
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}
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Type::UniquePtr(_) => {
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write_type(out, ret);
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write!(out, "(");
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}
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Type::Ref(_) => write!(out, "*"),
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_ => {}
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}
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}
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if efn.throws {
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write!(out, "::rust::Str::Repr error$ = ");
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}
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for name in out.namespace.clone() {
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write!(out, "{}$", name);
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}
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write!(out, "cxxbridge02${}(", efn.ident);
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for (i, arg) in efn.args.iter().enumerate() {
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if i > 0 {
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write!(out, ", ");
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}
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match &arg.ty {
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Type::Str(_) => write!(out, "::rust::Str::Repr("),
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ty if types.needs_indirect_abi(ty) => write!(out, "&"),
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_ => {}
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}
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write!(out, "{}", arg.ident);
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match &arg.ty {
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Type::RustBox(_) => write!(out, ".into_raw()"),
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Type::UniquePtr(_) => write!(out, ".release()"),
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Type::Str(_) => write!(out, ")"),
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ty if ty != RustString && types.needs_indirect_abi(ty) => write!(out, "$.value"),
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_ => {}
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}
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}
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if indirect_return {
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if !efn.args.is_empty() {
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write!(out, ", ");
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}
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write!(out, "&return$.value");
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}
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write!(out, ")");
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if let Some(ret) = &efn.ret {
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if let Type::RustBox(_) | Type::UniquePtr(_) = ret {
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write!(out, ")");
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}
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}
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writeln!(out, ";");
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if efn.throws {
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writeln!(out, " if (error$.ptr) {{");
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writeln!(out, " throw ::rust::Error(error$);");
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writeln!(out, " }}");
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}
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if indirect_return {
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writeln!(out, " return ::std::move(return$.value);");
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}
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writeln!(out, "}}");
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}
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}
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fn write_return_type(out: &mut OutFile, ty: &Option<Type>) {
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match ty {
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None => write!(out, "void "),
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Some(ty) => write_type_space(out, ty),
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}
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}
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fn indirect_return(efn: &ExternFn, types: &Types) -> bool {
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efn.ret
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.as_ref()
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.map_or(false, |ret| efn.throws || types.needs_indirect_abi(ret))
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}
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fn write_extern_return_type(out: &mut OutFile, ty: &Option<Type>, types: &Types) {
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match ty {
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Some(Type::RustBox(ty)) | Some(Type::UniquePtr(ty)) => {
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write_type_space(out, &ty.inner);
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write!(out, "*");
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}
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Some(Type::Ref(ty)) => {
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if ty.mutability.is_none() {
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write!(out, "const ");
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}
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write_type(out, &ty.inner);
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write!(out, " *");
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}
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Some(Type::Str(_)) => write!(out, "::rust::Str::Repr "),
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Some(ty) if types.needs_indirect_abi(ty) => write!(out, "void "),
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_ => write_return_type(out, ty),
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}
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}
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fn write_extern_arg(out: &mut OutFile, arg: &Var, types: &Types) {
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match &arg.ty {
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Type::RustBox(ty) | Type::UniquePtr(ty) => {
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write_type_space(out, &ty.inner);
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write!(out, "*");
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}
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Type::Str(_) => write!(out, "::rust::Str::Repr "),
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_ => write_type_space(out, &arg.ty),
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}
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if types.needs_indirect_abi(&arg.ty) {
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write!(out, "*");
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}
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write!(out, "{}", arg.ident);
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}
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fn write_type(out: &mut OutFile, ty: &Type) {
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match ty {
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Type::Ident(ident) => match Atom::from(ident) {
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Some(Bool) => write!(out, "bool"),
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Some(U8) => write!(out, "uint8_t"),
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Some(U16) => write!(out, "uint16_t"),
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Some(U32) => write!(out, "uint32_t"),
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Some(U64) => write!(out, "uint64_t"),
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Some(Usize) => write!(out, "size_t"),
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Some(I8) => write!(out, "int8_t"),
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Some(I16) => write!(out, "int16_t"),
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Some(I32) => write!(out, "int32_t"),
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Some(I64) => write!(out, "int64_t"),
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Some(Isize) => write!(out, "ssize_t"),
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Some(F32) => write!(out, "float"),
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Some(F64) => write!(out, "double"),
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Some(CxxString) => write!(out, "::std::string"),
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Some(RustString) => write!(out, "::rust::String"),
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None => write!(out, "{}", ident),
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},
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Type::RustBox(ty) => {
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write!(out, "::rust::Box<");
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write_type(out, &ty.inner);
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write!(out, ">");
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}
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Type::UniquePtr(ptr) => {
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write!(out, "::std::unique_ptr<");
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write_type(out, &ptr.inner);
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write!(out, ">");
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}
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Type::Ref(r) => {
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if r.mutability.is_none() {
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write!(out, "const ");
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}
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write_type(out, &r.inner);
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write!(out, " &");
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}
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Type::Str(_) => {
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write!(out, "::rust::Str");
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}
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Type::Void(_) => unreachable!(),
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}
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}
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fn write_type_space(out: &mut OutFile, ty: &Type) {
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write_type(out, ty);
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match ty {
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Type::Ident(_) | Type::RustBox(_) | Type::UniquePtr(_) | Type::Str(_) => write!(out, " "),
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Type::Ref(_) => {}
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Type::Void(_) => unreachable!(),
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}
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}
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|
|
fn write_generic_instantiations(out: &mut OutFile, types: &Types) {
|
|
fn allow_unique_ptr(ident: &Ident) -> bool {
|
|
Atom::from(ident).is_none()
|
|
}
|
|
|
|
out.begin_block("extern \"C\"");
|
|
for ty in types {
|
|
if let Type::RustBox(ty) = ty {
|
|
if let Type::Ident(inner) = &ty.inner {
|
|
out.next_section();
|
|
write_rust_box_extern(out, inner);
|
|
}
|
|
} else if let Type::UniquePtr(ptr) = ty {
|
|
if let Type::Ident(inner) = &ptr.inner {
|
|
if allow_unique_ptr(inner) {
|
|
out.next_section();
|
|
write_unique_ptr(out, inner);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
out.end_block("extern \"C\"");
|
|
|
|
out.begin_block("namespace rust");
|
|
out.begin_block("inline namespace cxxbridge02");
|
|
for ty in types {
|
|
if let Type::RustBox(ty) = ty {
|
|
if let Type::Ident(inner) = &ty.inner {
|
|
write_rust_box_impl(out, inner);
|
|
}
|
|
}
|
|
}
|
|
out.end_block("namespace cxxbridge02");
|
|
out.end_block("namespace rust");
|
|
}
|
|
|
|
fn write_rust_box_extern(out: &mut OutFile, ident: &Ident) {
|
|
let mut inner = String::new();
|
|
for name in &out.namespace {
|
|
inner += name;
|
|
inner += "::";
|
|
}
|
|
inner += &ident.to_string();
|
|
let instance = inner.replace("::", "$");
|
|
|
|
writeln!(out, "#ifndef CXXBRIDGE02_RUST_BOX_{}", instance);
|
|
writeln!(out, "#define CXXBRIDGE02_RUST_BOX_{}", instance);
|
|
writeln!(
|
|
out,
|
|
"void cxxbridge02$box${}$uninit(::rust::Box<{}> *ptr) noexcept;",
|
|
instance, inner,
|
|
);
|
|
writeln!(
|
|
out,
|
|
"void cxxbridge02$box${}$drop(::rust::Box<{}> *ptr) noexcept;",
|
|
instance, inner,
|
|
);
|
|
writeln!(out, "#endif // CXXBRIDGE02_RUST_BOX_{}", instance);
|
|
}
|
|
|
|
fn write_rust_box_impl(out: &mut OutFile, ident: &Ident) {
|
|
let mut inner = String::new();
|
|
for name in &out.namespace {
|
|
inner += name;
|
|
inner += "::";
|
|
}
|
|
inner += &ident.to_string();
|
|
let instance = inner.replace("::", "$");
|
|
|
|
writeln!(out, "template <>");
|
|
writeln!(out, "void Box<{}>::uninit() noexcept {{", inner);
|
|
writeln!(out, " return cxxbridge02$box${}$uninit(this);", instance);
|
|
writeln!(out, "}}");
|
|
|
|
writeln!(out, "template <>");
|
|
writeln!(out, "void Box<{}>::drop() noexcept {{", inner);
|
|
writeln!(out, " return cxxbridge02$box${}$drop(this);", instance);
|
|
writeln!(out, "}}");
|
|
}
|
|
|
|
fn write_unique_ptr(out: &mut OutFile, ident: &Ident) {
|
|
let mut inner = String::new();
|
|
for name in &out.namespace {
|
|
inner += name;
|
|
inner += "::";
|
|
}
|
|
inner += &ident.to_string();
|
|
let instance = inner.replace("::", "$");
|
|
|
|
writeln!(out, "#ifndef CXXBRIDGE02_UNIQUE_PTR_{}", instance);
|
|
writeln!(out, "#define CXXBRIDGE02_UNIQUE_PTR_{}", instance);
|
|
writeln!(
|
|
out,
|
|
"static_assert(sizeof(::std::unique_ptr<{}>) == sizeof(void *), \"\");",
|
|
inner,
|
|
);
|
|
writeln!(
|
|
out,
|
|
"static_assert(alignof(::std::unique_ptr<{}>) == alignof(void *), \"\");",
|
|
inner,
|
|
);
|
|
writeln!(
|
|
out,
|
|
"void cxxbridge02$unique_ptr${}$null(::std::unique_ptr<{}> *ptr) noexcept {{",
|
|
instance, inner,
|
|
);
|
|
writeln!(out, " new (ptr) ::std::unique_ptr<{}>();", inner);
|
|
writeln!(out, "}}");
|
|
writeln!(
|
|
out,
|
|
"void cxxbridge02$unique_ptr${}$new(::std::unique_ptr<{}> *ptr, {} *value) noexcept {{",
|
|
instance, inner, inner,
|
|
);
|
|
writeln!(
|
|
out,
|
|
" new (ptr) ::std::unique_ptr<{}>(new {}(::std::move(*value)));",
|
|
inner, inner,
|
|
);
|
|
writeln!(out, "}}");
|
|
writeln!(
|
|
out,
|
|
"void cxxbridge02$unique_ptr${}$raw(::std::unique_ptr<{}> *ptr, {} *raw) noexcept {{",
|
|
instance, inner, inner,
|
|
);
|
|
writeln!(out, " new (ptr) ::std::unique_ptr<{}>(raw);", inner);
|
|
writeln!(out, "}}");
|
|
writeln!(
|
|
out,
|
|
"const {} *cxxbridge02$unique_ptr${}$get(const ::std::unique_ptr<{}>& ptr) noexcept {{",
|
|
inner, instance, inner,
|
|
);
|
|
writeln!(out, " return ptr.get();");
|
|
writeln!(out, "}}");
|
|
writeln!(
|
|
out,
|
|
"{} *cxxbridge02$unique_ptr${}$release(::std::unique_ptr<{}>& ptr) noexcept {{",
|
|
inner, instance, inner,
|
|
);
|
|
writeln!(out, " return ptr.release();");
|
|
writeln!(out, "}}");
|
|
writeln!(
|
|
out,
|
|
"void cxxbridge02$unique_ptr${}$drop(::std::unique_ptr<{}> *ptr) noexcept {{",
|
|
instance, inner,
|
|
);
|
|
writeln!(out, " ptr->~unique_ptr();");
|
|
writeln!(out, "}}");
|
|
writeln!(out, "#endif // CXXBRIDGE02_UNIQUE_PTR_{}", instance);
|
|
}
|