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Expansion stack scaffold

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This commit is contained in:
Aleksey Kladov 2019-11-14 09:52:03 +03:00
parent c89010df2d
commit e7880db1d0
2 changed files with 38 additions and 8 deletions
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37
crates/ra_hir_def/src/body.rs
View file

@ -3,7 +3,7 @@ mod lower;
use std::{ops::Index, sync::Arc};
use hir_expand::{either::Either, HirFileId, MacroDefId, Source};
use hir_expand::{either::Either, hygiene::Hygiene, HirFileId, MacroDefId, Source};
use ra_arena::{map::ArenaMap, Arena};
use ra_syntax::{ast, AstPtr};
use rustc_hash::FxHashMap;
@ -20,13 +20,34 @@ pub struct Expander {
crate_def_map: Arc<CrateDefMap>,
original_file_id: HirFileId,
current_file_id: HirFileId,
hygiene: Hygiene,
module: ModuleId,
}
impl Expander {
pub fn new(db: &impl DefDatabase2, current_file_id: HirFileId, module: ModuleId) -> Expander {
let crate_def_map = db.crate_def_map(module.krate);
Expander { crate_def_map, original_file_id: current_file_id, current_file_id, module }
let hygiene = Hygiene::new(db, current_file_id);
Expander {
crate_def_map,
original_file_id: current_file_id,
current_file_id,
hygiene,
module,
}
}
fn enter(&mut self, db: &impl DefDatabase2, file_id: HirFileId) -> Mark {
let mark = Mark { file_id: self.current_file_id };
self.hygiene = Hygiene::new(db, file_id);
self.current_file_id = file_id;
mark
}
fn exit(&mut self, db: &impl DefDatabase2, mark: Mark) {
self.hygiene = Hygiene::new(db, mark.file_id);
self.current_file_id = mark.file_id;
std::mem::forget(mark);
}
// FIXME: remove this.
@ -43,6 +64,18 @@ impl Expander {
}
}
struct Mark {
file_id: HirFileId,
}
impl Drop for Mark {
fn drop(&mut self) {
if !std::thread::panicking() {
panic!("dropped mark")
}
}
}
/// The body of an item (function, const etc.).
#[derive(Debug, Eq, PartialEq)]
pub struct Body {

9
crates/ra_hir_def/src/body/lower.rs
View file

@ -2,7 +2,6 @@
use hir_expand::{
either::Either,
hygiene::Hygiene,
name::{self, AsName, Name},
AstId, MacroCallLoc, MacroFileKind,
};
@ -447,10 +446,9 @@ where
if let Some(node) = self.db.parse_or_expand(file_id) {
if let Some(expr) = ast::Expr::cast(node) {
log::debug!("macro expansion {:#?}", expr.syntax());
let old_file_id =
std::mem::replace(&mut self.expander.current_file_id, file_id);
let mark = self.expander.enter(self.db, file_id);
let id = self.collect_expr(expr);
self.expander.current_file_id = old_file_id;
self.expander.exit(self.db, mark);
return id;
}
}
@ -572,8 +570,7 @@ where
}
fn parse_path(&mut self, path: ast::Path) -> Option<Path> {
let hygiene = Hygiene::new(self.db, self.expander.current_file_id);
Path::from_src(path, &hygiene)
Path::from_src(path, &self.expander.hygiene)
}
}