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rustc_builtin_macros: Share some more logic between derive and cfg_eval

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This commit is contained in:
Vadim Petrochenkov 2021-03-07 01:11:21 +03:00
parent 10ed08f5b6
commit 5d27728141
2 changed files with 14 additions and 26 deletions
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19
compiler/rustc_builtin_macros/src/cfg_eval.rs
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@ -14,27 +14,30 @@ crate fn expand(
ecx: &mut ExtCtxt<'_>,
_span: Span,
meta_item: &ast::MetaItem,
item: Annotatable,
annotatable: Annotatable,
) -> Vec<Annotatable> {
check_builtin_macro_attribute(ecx, meta_item, sym::cfg_eval);
cfg_eval(ecx, annotatable)
}
crate fn cfg_eval(ecx: &ExtCtxt<'_>, annotatable: Annotatable) -> Vec<Annotatable> {
let mut visitor = CfgEval {
cfg: StripUnconfigured { sess: ecx.sess, features: ecx.ecfg.features, modified: false },
};
let mut item = visitor.fully_configure(item);
let mut annotatable = visitor.configure_annotatable(annotatable);
if visitor.cfg.modified {
// Erase the tokens if cfg-stripping modified the item
// This will cause us to synthesize fake tokens
// when `nt_to_tokenstream` is called on this item.
if let Some(tokens) = item.tokens_mut() {
if let Some(tokens) = annotatable.tokens_mut() {
*tokens = None;
}
}
vec![item]
vec![annotatable]
}
crate struct CfgEval<'a> {
pub cfg: StripUnconfigured<'a>,
struct CfgEval<'a> {
cfg: StripUnconfigured<'a>,
}
impl CfgEval<'_> {
@ -42,10 +45,10 @@ impl CfgEval<'_> {
self.cfg.configure(node)
}
crate fn fully_configure(&mut self, item: Annotatable) -> Annotatable {
fn configure_annotatable(&mut self, annotatable: Annotatable) -> Annotatable {
// Since the item itself has already been configured by the InvocationCollector,
// we know that fold result vector will contain exactly one element
match item {
match annotatable {
Annotatable::Item(item) => Annotatable::Item(self.flat_map_item(item).pop().unwrap()),
Annotatable::TraitItem(item) => {
Annotatable::TraitItem(self.flat_map_trait_item(item).pop().unwrap())