use crate::gen::block::Block;
use crate::gen::ifndef;
use crate::gen::out::{Content, OutFile};
#[derive(Default, PartialEq)]
pub(crate) struct Builtins<'a> {
pub panic: bool,
pub rust_string: bool,
pub rust_str: bool,
pub rust_slice: bool,
pub rust_box: bool,
pub rust_vec: bool,
pub rust_fn: bool,
pub rust_isize: bool,
pub opaque: bool,
pub layout: bool,
pub unsafe_bitcopy: bool,
pub unsafe_bitcopy_t: bool,
pub rust_error: bool,
pub manually_drop: bool,
pub maybe_uninit: bool,
pub trycatch: bool,
pub ptr_len: bool,
pub repr_fat: bool,
pub rust_str_new_unchecked: bool,
pub rust_str_repr: bool,
pub rust_slice_new: bool,
pub rust_slice_repr: bool,
pub relocatable: bool,
pub relocatable_or_array: bool,
pub friend_impl: bool,
pub is_complete: bool,
pub destroy: bool,
pub deleter_if: bool,
pub content: Content<'a>,
}
impl<'a> Builtins<'a> {
pub(crate) fn new() -> Self {
Builtins::default()
}
}
pub(super) fn write(out: &mut OutFile) {
if out.builtin == Default::default() {
return;
}
let include = &mut out.include;
let builtin = &mut out.builtin;
let out = &mut builtin.content;
if builtin.rust_string {
include.array = true;
include.cstdint = true;
include.string = true;
}
if builtin.rust_str {
include.array = true;
include.cstdint = true;
include.string = true;
builtin.friend_impl = true;
}
if builtin.rust_vec {
include.algorithm = true;
include.array = true;
include.cassert = true;
include.cstddef = true;
include.cstdint = true;
include.initializer_list = true;
include.iterator = true;
include.new = true;
include.stdexcept = true;
include.type_traits = true;
include.utility = true;
builtin.panic = true;
builtin.rust_slice = true;
builtin.unsafe_bitcopy_t = true;
}
if builtin.rust_slice {
include.array = true;
include.cassert = true;
include.cstddef = true;
include.cstdint = true;
include.iterator = true;
include.stdexcept = true;
include.type_traits = true;
builtin.friend_impl = true;
builtin.layout = true;
builtin.panic = true;
}
if builtin.rust_box {
include.new = true;
include.type_traits = true;
include.utility = true;
}
if builtin.rust_fn {
include.utility = true;
}
if builtin.rust_error {
include.exception = true;
builtin.friend_impl = true;
}
if builtin.rust_isize {
include.basetsd = true;
include.sys_types = true;
}
if builtin.relocatable_or_array {
include.cstddef = true;
builtin.relocatable = true;
}
if builtin.relocatable {
include.type_traits = true;
}
if builtin.layout {
include.type_traits = true;
include.cstddef = true;
builtin.is_complete = true;
}
if builtin.is_complete {
include.cstddef = true;
include.type_traits = true;
}
if builtin.unsafe_bitcopy {
builtin.unsafe_bitcopy_t = true;
}
if builtin.trycatch {
builtin.ptr_len = true;
}
out.begin_block(Block::Namespace("rust"));
out.begin_block(Block::InlineNamespace("cxxbridge1"));
let cxx_header = include.has_cxx_header();
if !cxx_header {
writeln!(out, "// #include \"rust/cxx.h\"");
ifndef::write(out, builtin.panic, "CXXBRIDGE1_PANIC");
if builtin.rust_string {
out.next_section();
writeln!(out, "struct unsafe_bitcopy_t;");
}
if builtin.friend_impl {
out.begin_block(Block::AnonymousNamespace);
writeln!(out, "template <typename T>");
writeln!(out, "class impl;");
out.end_block(Block::AnonymousNamespace);
}
out.next_section();
if builtin.rust_str && !builtin.rust_string {
writeln!(out, "class String;");
}
if builtin.layout && !builtin.opaque {
writeln!(out, "class Opaque;");
}
if builtin.rust_slice {
out.next_section();
writeln!(out, "template <typename T>");
writeln!(out, "::std::size_t size_of();");
writeln!(out, "template <typename T>");
writeln!(out, "::std::size_t align_of();");
}
ifndef::write(out, builtin.rust_string, "CXXBRIDGE1_RUST_STRING");
ifndef::write(out, builtin.rust_str, "CXXBRIDGE1_RUST_STR");
ifndef::write(out, builtin.rust_slice, "CXXBRIDGE1_RUST_SLICE");
ifndef::write(out, builtin.rust_box, "CXXBRIDGE1_RUST_BOX");
ifndef::write(out, builtin.unsafe_bitcopy_t, "CXXBRIDGE1_RUST_BITCOPY_T");
ifndef::write(out, builtin.unsafe_bitcopy, "CXXBRIDGE1_RUST_BITCOPY");
ifndef::write(out, builtin.rust_vec, "CXXBRIDGE1_RUST_VEC");
ifndef::write(out, builtin.rust_fn, "CXXBRIDGE1_RUST_FN");
ifndef::write(out, builtin.rust_error, "CXXBRIDGE1_RUST_ERROR");
ifndef::write(out, builtin.rust_isize, "CXXBRIDGE1_RUST_ISIZE");
ifndef::write(out, builtin.opaque, "CXXBRIDGE1_RUST_OPAQUE");
ifndef::write(out, builtin.is_complete, "CXXBRIDGE1_IS_COMPLETE");
ifndef::write(out, builtin.layout, "CXXBRIDGE1_LAYOUT");
ifndef::write(out, builtin.relocatable, "CXXBRIDGE1_RELOCATABLE");
}
if builtin.rust_str_new_unchecked {
out.next_section();
writeln!(out, "class Str::uninit {{}};");
writeln!(out, "inline Str::Str(uninit) noexcept {{}}");
}
if builtin.rust_slice_new {
out.next_section();
writeln!(out, "template <typename T>");
writeln!(out, "class Slice<T>::uninit {{}};");
writeln!(out, "template <typename T>");
writeln!(out, "inline Slice<T>::Slice(uninit) noexcept {{}}");
}
out.begin_block(Block::Namespace("repr"));
if builtin.repr_fat {
include.array = true;
include.cstdint = true;
out.next_section();
writeln!(out, "using Fat = ::std::array<::std::uintptr_t, 2>;");
}
if builtin.ptr_len {
include.cstddef = true;
out.next_section();
writeln!(out, "struct PtrLen final {{");
writeln!(out, " void *ptr;");
writeln!(out, " ::std::size_t len;");
writeln!(out, "}};");
}
out.end_block(Block::Namespace("repr"));
out.begin_block(Block::Namespace("detail"));
if builtin.maybe_uninit {
include.cstddef = true;
include.new = true;
out.next_section();
writeln!(out, "template <typename T, typename = void *>");
writeln!(out, "struct operator_new {{");
writeln!(
out,
" void *operator()(::std::size_t sz) {{ return ::operator new(sz); }}",
);
writeln!(out, "}};");
out.next_section();
writeln!(out, "template <typename T>");
writeln!(
out,
"struct operator_new<T, decltype(T::operator new(sizeof(T)))> {{",
);
writeln!(
out,
" void *operator()(::std::size_t sz) {{ return T::operator new(sz); }}",
);
writeln!(out, "}};");
}
if builtin.trycatch {
include.string = true;
out.next_section();
writeln!(out, "class Fail final {{");
writeln!(out, " ::rust::repr::PtrLen &throw$;");
writeln!(out, "public:");
writeln!(
out,
" Fail(::rust::repr::PtrLen &throw$) noexcept : throw$(throw$) {{}}",
);
writeln!(out, " void operator()(char const *) noexcept;");
writeln!(out, " void operator()(std::string const &) noexcept;");
writeln!(out, "}};");
}
out.end_block(Block::Namespace("detail"));
if builtin.manually_drop {
out.next_section();
include.utility = true;
writeln!(out, "template <typename T>");
writeln!(out, "union ManuallyDrop {{");
writeln!(out, " T value;");
writeln!(
out,
" ManuallyDrop(T &&value) : value(::std::move(value)) {{}}",
);
writeln!(out, " ~ManuallyDrop() {{}}");
writeln!(out, "}};");
}
if builtin.maybe_uninit {
include.cstddef = true;
out.next_section();
writeln!(out, "template <typename T>");
writeln!(out, "union MaybeUninit {{");
writeln!(out, " T value;");
writeln!(
out,
" void *operator new(::std::size_t sz) {{ return detail::operator_new<T>{{}}(sz); }}",
);
writeln!(out, " MaybeUninit() {{}}");
writeln!(out, " ~MaybeUninit() {{}}");
writeln!(out, "}};");
}
out.begin_block(Block::AnonymousNamespace);
if builtin.rust_str_new_unchecked || builtin.rust_str_repr {
out.next_section();
writeln!(out, "template <>");
writeln!(out, "class impl<Str> final {{");
writeln!(out, "public:");
if builtin.rust_str_new_unchecked {
writeln!(
out,
" static Str new_unchecked(repr::Fat repr) noexcept {{",
);
writeln!(out, " Str str = Str::uninit{{}};");
writeln!(out, " str.repr = repr;");
writeln!(out, " return str;");
writeln!(out, " }}");
}
if builtin.rust_str_repr {
writeln!(out, " static repr::Fat repr(Str str) noexcept {{");
writeln!(out, " return str.repr;");
writeln!(out, " }}");
}
writeln!(out, "}};");
}
if builtin.rust_slice_new || builtin.rust_slice_repr {
out.next_section();
writeln!(out, "template <typename T>");
writeln!(out, "class impl<Slice<T>> final {{");
writeln!(out, "public:");
if builtin.rust_slice_new {
writeln!(out, " static Slice<T> slice(repr::Fat repr) noexcept {{");
writeln!(out, " Slice<T> slice = typename Slice<T>::uninit{{}};");
writeln!(out, " slice.repr = repr;");
writeln!(out, " return slice;");
writeln!(out, " }}");
}
if builtin.rust_slice_repr {
writeln!(out, " static repr::Fat repr(Slice<T> slice) noexcept {{");
writeln!(out, " return slice.repr;");
writeln!(out, " }}");
}
writeln!(out, "}};");
}
if builtin.rust_error {
out.next_section();
writeln!(out, "template <>");
writeln!(out, "class impl<Error> final {{");
writeln!(out, "public:");
writeln!(out, " static Error error(repr::PtrLen repr) noexcept {{");
writeln!(out, " Error error;");
writeln!(out, " error.msg = static_cast<char const *>(repr.ptr);");
writeln!(out, " error.len = repr.len;");
writeln!(out, " return error;");
writeln!(out, " }}");
writeln!(out, "}};");
}
if builtin.destroy {
out.next_section();
writeln!(out, "template <typename T>");
writeln!(out, "void destroy(T *ptr) {{");
writeln!(out, " ptr->~T();");
writeln!(out, "}}");
}
if builtin.deleter_if {
out.next_section();
writeln!(out, "template <bool> struct deleter_if {{");
writeln!(out, " template <typename T> void operator()(T *) {{}}");
writeln!(out, "}};");
out.next_section();
writeln!(out, "template <> struct deleter_if<true> {{");
writeln!(
out,
" template <typename T> void operator()(T *ptr) {{ ptr->~T(); }}",
);
writeln!(out, "}};");
}
if builtin.relocatable_or_array {
out.next_section();
writeln!(out, "template <typename T>");
writeln!(out, "struct IsRelocatableOrArray : IsRelocatable<T> {{}};");
writeln!(out, "template <typename T, ::std::size_t N>");
writeln!(
out,
"struct IsRelocatableOrArray<T[N]> : IsRelocatableOrArray<T> {{}};",
);
}
out.end_block(Block::AnonymousNamespace);
out.end_block(Block::InlineNamespace("cxxbridge1"));
if builtin.trycatch {
out.begin_block(Block::Namespace("behavior"));
include.exception = true;
include.type_traits = true;
include.utility = true;
writeln!(out, "class missing {{}};");
writeln!(out, "missing trycatch(...);");
writeln!(out);
writeln!(out, "template <typename Try, typename Fail>");
writeln!(out, "static typename ::std::enable_if<");
writeln!(
out,
" ::std::is_same<decltype(trycatch(::std::declval<Try>(), ::std::declval<Fail>())),",
);
writeln!(out, " missing>::value>::type");
writeln!(out, "trycatch(Try &&func, Fail &&fail) noexcept try {{");
writeln!(out, " func();");
writeln!(out, "}} catch (::std::exception const &e) {{");
writeln!(out, " fail(e.what());");
writeln!(out, "}}");
out.end_block(Block::Namespace("behavior"));
}
out.end_block(Block::Namespace("rust"));
}
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