bjoernager/rust
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rustc_interface: Add a new query pre_configure

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It partially expands crate attributes before the main expansion pass (without modifying the crate), and the produced preliminary crate attribute list is used for querying a few attributes that are required very early.

Crate-level cfg attributes are then expanded normally during the main expansion pass, like attributes on any other nodes.
This commit is contained in:
Vadim Petrochenkov 2023-03-14 16:53:04 +04:00
parent f26da39e04
commit aca1b1e0b3
12 changed files with 108 additions and 84 deletions
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17
compiler/rustc_builtin_macros/src/standard_library_imports.rs
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@ -8,14 +8,20 @@ use rustc_span::symbol::{kw, sym, Ident, Symbol};
use rustc_span::DUMMY_SP;
use thin_vec::thin_vec;
pub fn inject(krate: &mut ast::Crate, resolver: &mut dyn ResolverExpand, sess: &Session) {
pub fn inject(
krate: &mut ast::Crate,
pre_configured_attrs: &[ast::Attribute],
resolver: &mut dyn ResolverExpand,
sess: &Session,
) -> usize {
let orig_num_items = krate.items.len();
let edition = sess.parse_sess.edition;
// the first name in this list is the crate name of the crate with the prelude
let names: &[Symbol] = if attr::contains_name(&krate.attrs, sym::no_core) {
return;
} else if attr::contains_name(&krate.attrs, sym::no_std) {
if attr::contains_name(&krate.attrs, sym::compiler_builtins) {
let names: &[Symbol] = if attr::contains_name(pre_configured_attrs, sym::no_core) {
return 0;
} else if attr::contains_name(pre_configured_attrs, sym::no_std) {
if attr::contains_name(pre_configured_attrs, sym::compiler_builtins) {
&[sym::core]
} else {
&[sym::core, sym::compiler_builtins]
@ -84,4 +90,5 @@ pub fn inject(krate: &mut ast::Crate, resolver: &mut dyn ResolverExpand, sess: &
);
krate.items.insert(0, use_item);
krate.items.len() - orig_num_items
}