bjoernager/rust
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Allow #[rustc_builtin_macro = "name"].

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This makes it possible to have both std::panic and core::panic as a
builtin macro, by using different builtin macro names for each.

Also removes SyntaxExtension::is_derive_copy, as the macro name (e.g.
sym::Copy) is now tracked and provides that information directly.
This commit is contained in:
Mara Bos 2021-01-09 16:48:58 +01:00
parent 1f9dc9a182
commit d651fa78ce
5 changed files with 11 additions and 15 deletions
Download patch file Download diff file Expand all files Collapse all files

4
compiler/rustc_resolve/src/lib.rs
View file

@ -1443,7 +1443,7 @@ impl<'a> Resolver<'a> {
}
fn is_builtin_macro(&mut self, res: Res) -> bool {
self.get_macro(res).map_or(false, |ext| ext.is_builtin)
self.get_macro(res).map_or(false, |ext| ext.builtin_name.is_some())
}
fn macro_def(&self, mut ctxt: SyntaxContext) -> DefId {
@ -2010,7 +2010,7 @@ impl<'a> Resolver<'a> {
// The macro is a proc macro derive
if let Some(def_id) = module.expansion.expn_data().macro_def_id {
let ext = self.get_macro_by_def_id(def_id);
if !ext.is_builtin
if ext.builtin_name.is_none()
&& ext.macro_kind() == MacroKind::Derive
&& parent.expansion.outer_expn_is_descendant_of(span.ctxt())
{

6
compiler/rustc_resolve/src/macros.rs
View file

@ -285,7 +285,7 @@ impl<'a> ResolverExpand for Resolver<'a> {
helper_attrs.extend(
ext.helper_attrs.iter().map(|name| Ident::new(*name, span)),
);
if ext.is_derive_copy {
if ext.builtin_name == Some(sym::Copy) {
self.containers_deriving_copy.insert(invoc_id);
}
ext
@ -1089,9 +1089,9 @@ impl<'a> Resolver<'a> {
edition,
);
if result.is_builtin {
if let Some(builtin_name) = result.builtin_name {
// The macro was marked with `#[rustc_builtin_macro]`.
if let Some(builtin_macro) = self.builtin_macros.get_mut(&item.ident.name) {
if let Some(builtin_macro) = self.builtin_macros.get_mut(&builtin_name) {
// The macro is a built-in, replace its expander function
// while still taking everything else from the source code.
// If we already loaded this builtin macro, give a better error message than 'no such builtin macro'.