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//! The compiler code necessary to implement the `#[derive]` extensions.
use rustc_ast as ast;
use rustc_ast::ptr::P;
use rustc_ast::{GenericArg, MetaItem};
use rustc_expand::base::{Annotatable, ExpandResult, ExtCtxt, MultiItemModifier};
use rustc_span::symbol::{sym, Symbol};
use rustc_span::Span;
use thin_vec::{thin_vec, ThinVec};
macro path_local($x:ident) {
generic::ty::Path::new_local(sym::$x)
}
macro pathvec_std($($rest:ident)::+) {{
vec![ $( sym::$rest ),+ ]
}}
macro path_std($($x:tt)*) {
generic::ty::Path::new( pathvec_std!( $($x)* ) )
}
pub mod bounds;
pub mod clone;
pub mod debug;
pub mod decodable;
pub mod default;
pub mod encodable;
pub mod hash;
#[path = "cmp/eq.rs"]
pub mod eq;
#[path = "cmp/ord.rs"]
pub mod ord;
#[path = "cmp/partial_eq.rs"]
pub mod partial_eq;
#[path = "cmp/partial_ord.rs"]
pub mod partial_ord;
pub mod generic;
pub(crate) type BuiltinDeriveFn =
fn(&mut ExtCtxt<'_>, Span, &MetaItem, &Annotatable, &mut dyn FnMut(Annotatable), bool);
pub(crate) struct BuiltinDerive(pub(crate) BuiltinDeriveFn);
impl MultiItemModifier for BuiltinDerive {
fn expand(
&self,
ecx: &mut ExtCtxt<'_>,
span: Span,
meta_item: &MetaItem,
item: Annotatable,
is_derive_const: bool,
) -> ExpandResult<Vec<Annotatable>, Annotatable> {
// FIXME: Built-in derives often forget to give spans contexts,
// so we are doing it here in a centralized way.
let span = ecx.with_def_site_ctxt(span);
let mut items = Vec::new();
match item {
Annotatable::Stmt(stmt) => {
if let ast::StmtKind::Item(item) = stmt.into_inner().kind {
(self.0)(
ecx,
span,
meta_item,
&Annotatable::Item(item),
&mut |a| {
// Cannot use 'ecx.stmt_item' here, because we need to pass 'ecx'
// to the function
items.push(Annotatable::Stmt(P(ast::Stmt {
id: ast::DUMMY_NODE_ID,
kind: ast::StmtKind::Item(a.expect_item()),
span,
})));
},
is_derive_const,
);
} else {
unreachable!("should have already errored on non-item statement")
}
}
_ => {
(self.0)(ecx, span, meta_item, &item, &mut |a| items.push(a), is_derive_const);
}
}
ExpandResult::Ready(items)
}
}
/// Constructs an expression that calls an intrinsic
fn call_intrinsic(
cx: &ExtCtxt<'_>,
span: Span,
intrinsic: Symbol,
args: ThinVec<P<ast::Expr>>,
) -> P<ast::Expr> {
let span = cx.with_def_site_ctxt(span);
let path = cx.std_path(&[sym::intrinsics, intrinsic]);
cx.expr_call_global(span, path, args)
}
/// Constructs an expression that calls the `unreachable` intrinsic.
fn call_unreachable(cx: &ExtCtxt<'_>, span: Span) -> P<ast::Expr> {
let span = cx.with_def_site_ctxt(span);
let path = cx.std_path(&[sym::intrinsics, sym::unreachable]);
let call = cx.expr_call_global(span, path, ThinVec::new());
cx.expr_block(P(ast::Block {
stmts: thin_vec![cx.stmt_expr(call)],
id: ast::DUMMY_NODE_ID,
rules: ast::BlockCheckMode::Unsafe(ast::CompilerGenerated),
span,
tokens: None,
could_be_bare_literal: false,
}))
}
fn assert_ty_bounds(
cx: &mut ExtCtxt<'_>,
stmts: &mut ThinVec<ast::Stmt>,
ty: P<ast::Ty>,
span: Span,
assert_path: &[Symbol],
) {
// Generate statement `let _: assert_path<ty>;`.
let span = cx.with_def_site_ctxt(span);
let assert_path = cx.path_all(span, true, cx.std_path(assert_path), vec![GenericArg::Type(ty)]);
stmts.push(cx.stmt_let_type_only(span, cx.ty_path(assert_path)));
}
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