473 lines
17 KiB
Rust
473 lines
17 KiB
Rust
//! Implementation of find-usages functionality.
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//!
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//! It is based on the standard ide trick: first, we run a fast text search to
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//! get a super-set of matches. Then, we we confirm each match using precise
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//! name resolution.
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use std::{convert::TryInto, mem};
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use base_db::{FileId, FileRange, SourceDatabaseExt};
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use hir::{DefWithBody, HasSource, Module, ModuleSource, Semantics, Visibility};
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use once_cell::unsync::Lazy;
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use rustc_hash::FxHashMap;
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use syntax::{ast, match_ast, AstNode, TextRange, TextSize};
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use crate::defs::NameClass;
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use crate::{
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defs::{Definition, NameRefClass},
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RootDatabase,
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};
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#[derive(Debug, Default, Clone)]
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pub struct UsageSearchResult {
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pub references: FxHashMap<FileId, Vec<FileReference>>,
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}
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impl UsageSearchResult {
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pub fn is_empty(&self) -> bool {
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self.references.is_empty()
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}
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pub fn len(&self) -> usize {
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self.references.len()
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}
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pub fn iter(&self) -> impl Iterator<Item = (&FileId, &Vec<FileReference>)> + '_ {
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self.references.iter()
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}
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pub fn file_ranges(&self) -> impl Iterator<Item = FileRange> + '_ {
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self.references.iter().flat_map(|(&file_id, refs)| {
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refs.iter().map(move |&FileReference { range, .. }| FileRange { file_id, range })
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})
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}
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}
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impl IntoIterator for UsageSearchResult {
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type Item = (FileId, Vec<FileReference>);
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type IntoIter = <FxHashMap<FileId, Vec<FileReference>> as IntoIterator>::IntoIter;
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fn into_iter(self) -> Self::IntoIter {
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self.references.into_iter()
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}
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}
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#[derive(Debug, Clone)]
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pub struct FileReference {
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pub range: TextRange,
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pub name: ast::NameLike,
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pub access: Option<ReferenceAccess>,
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}
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#[derive(Debug, Copy, Clone, PartialEq)]
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pub enum ReferenceAccess {
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Read,
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Write,
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}
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/// Generally, `search_scope` returns files that might contain references for the element.
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/// For `pub(crate)` things it's a crate, for `pub` things it's a crate and dependant crates.
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/// In some cases, the location of the references is known to within a `TextRange`,
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/// e.g. for things like local variables.
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pub struct SearchScope {
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entries: FxHashMap<FileId, Option<TextRange>>,
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}
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impl SearchScope {
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fn new(entries: FxHashMap<FileId, Option<TextRange>>) -> SearchScope {
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SearchScope { entries }
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}
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pub fn empty() -> SearchScope {
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SearchScope::new(FxHashMap::default())
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}
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pub fn single_file(file: FileId) -> SearchScope {
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SearchScope::new(std::iter::once((file, None)).collect())
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}
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pub fn files(files: &[FileId]) -> SearchScope {
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SearchScope::new(files.iter().map(|f| (*f, None)).collect())
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}
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pub fn intersection(&self, other: &SearchScope) -> SearchScope {
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let (mut small, mut large) = (&self.entries, &other.entries);
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if small.len() > large.len() {
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mem::swap(&mut small, &mut large)
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}
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let res = small
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.iter()
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.filter_map(|(file_id, r1)| {
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let r2 = large.get(file_id)?;
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let r = intersect_ranges(*r1, *r2)?;
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Some((*file_id, r))
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})
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.collect();
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return SearchScope::new(res);
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fn intersect_ranges(
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r1: Option<TextRange>,
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r2: Option<TextRange>,
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) -> Option<Option<TextRange>> {
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match (r1, r2) {
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(None, r) | (r, None) => Some(r),
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(Some(r1), Some(r2)) => {
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let r = r1.intersect(r2)?;
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Some(Some(r))
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}
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}
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}
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}
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}
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impl IntoIterator for SearchScope {
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type Item = (FileId, Option<TextRange>);
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type IntoIter = std::collections::hash_map::IntoIter<FileId, Option<TextRange>>;
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fn into_iter(self) -> Self::IntoIter {
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self.entries.into_iter()
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}
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}
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impl Definition {
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fn search_scope(&self, db: &RootDatabase) -> SearchScope {
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let _p = profile::span("search_scope");
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let module = match self.module(db) {
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Some(it) => it,
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None => return SearchScope::empty(),
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};
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let module_src = module.definition_source(db);
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let file_id = module_src.file_id.original_file(db);
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if let Definition::Local(var) = self {
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let range = match var.parent(db) {
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DefWithBody::Function(f) => {
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f.source(db).and_then(|src| Some(src.value.syntax().text_range()))
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}
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DefWithBody::Const(c) => {
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c.source(db).and_then(|src| Some(src.value.syntax().text_range()))
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}
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DefWithBody::Static(s) => {
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s.source(db).and_then(|src| Some(src.value.syntax().text_range()))
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}
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};
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let mut res = FxHashMap::default();
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res.insert(file_id, range);
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return SearchScope::new(res);
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}
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if let Definition::GenericParam(hir::GenericParam::LifetimeParam(param)) = self {
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let range = match param.parent(db) {
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hir::GenericDef::Function(it) => {
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it.source(db).and_then(|src| Some(src.value.syntax().text_range()))
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}
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hir::GenericDef::Adt(it) => match it {
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hir::Adt::Struct(it) => {
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it.source(db).and_then(|src| Some(src.value.syntax().text_range()))
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}
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hir::Adt::Union(it) => {
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it.source(db).and_then(|src| Some(src.value.syntax().text_range()))
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}
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hir::Adt::Enum(it) => {
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it.source(db).and_then(|src| Some(src.value.syntax().text_range()))
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}
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},
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hir::GenericDef::Trait(it) => {
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it.source(db).and_then(|src| Some(src.value.syntax().text_range()))
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}
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hir::GenericDef::TypeAlias(it) => {
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it.source(db).and_then(|src| Some(src.value.syntax().text_range()))
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}
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hir::GenericDef::Impl(it) => {
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it.source(db).and_then(|src| Some(src.value.syntax().text_range()))
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}
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hir::GenericDef::Variant(it) => {
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it.source(db).and_then(|src| Some(src.value.syntax().text_range()))
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}
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hir::GenericDef::Const(it) => {
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it.source(db).and_then(|src| Some(src.value.syntax().text_range()))
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}
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};
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let mut res = FxHashMap::default();
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res.insert(file_id, range);
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return SearchScope::new(res);
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}
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let vis = self.visibility(db);
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if let Some(Visibility::Module(module)) = vis.and_then(|it| it.into()) {
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let module: Module = module.into();
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let mut res = FxHashMap::default();
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let mut to_visit = vec![module];
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let mut is_first = true;
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while let Some(module) = to_visit.pop() {
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let src = module.definition_source(db);
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let file_id = src.file_id.original_file(db);
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match src.value {
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ModuleSource::Module(m) => {
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if is_first {
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let range = Some(m.syntax().text_range());
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res.insert(file_id, range);
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} else {
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// We have already added the enclosing file to the search scope,
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// so do nothing.
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}
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}
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ModuleSource::BlockExpr(b) => {
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if is_first {
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let range = Some(b.syntax().text_range());
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res.insert(file_id, range);
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} else {
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// We have already added the enclosing file to the search scope,
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// so do nothing.
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}
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}
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ModuleSource::SourceFile(_) => {
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res.insert(file_id, None);
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}
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};
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is_first = false;
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to_visit.extend(module.children(db));
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}
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return SearchScope::new(res);
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}
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if let Some(Visibility::Public) = vis {
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let source_root_id = db.file_source_root(file_id);
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let source_root = db.source_root(source_root_id);
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let mut res = source_root.iter().map(|id| (id, None)).collect::<FxHashMap<_, _>>();
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let krate = module.krate();
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for rev_dep in krate.reverse_dependencies(db) {
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let root_file = rev_dep.root_file(db);
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let source_root_id = db.file_source_root(root_file);
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let source_root = db.source_root(source_root_id);
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res.extend(source_root.iter().map(|id| (id, None)));
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}
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return SearchScope::new(res);
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}
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let mut res = FxHashMap::default();
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let range = match module_src.value {
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ModuleSource::Module(m) => Some(m.syntax().text_range()),
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ModuleSource::BlockExpr(b) => Some(b.syntax().text_range()),
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ModuleSource::SourceFile(_) => None,
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};
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res.insert(file_id, range);
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SearchScope::new(res)
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}
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pub fn usages<'a>(&'a self, sema: &'a Semantics<RootDatabase>) -> FindUsages<'a> {
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FindUsages { def: self, sema, scope: None }
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}
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}
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pub struct FindUsages<'a> {
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def: &'a Definition,
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sema: &'a Semantics<'a, RootDatabase>,
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scope: Option<SearchScope>,
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}
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impl<'a> FindUsages<'a> {
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pub fn in_scope(self, scope: SearchScope) -> FindUsages<'a> {
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self.set_scope(Some(scope))
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}
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pub fn set_scope(mut self, scope: Option<SearchScope>) -> FindUsages<'a> {
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assert!(self.scope.is_none());
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self.scope = scope;
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self
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}
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pub fn at_least_one(self) -> bool {
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let mut found = false;
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self.search(&mut |_, _| {
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found = true;
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true
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});
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found
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}
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pub fn all(self) -> UsageSearchResult {
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let mut res = UsageSearchResult::default();
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self.search(&mut |file_id, reference| {
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res.references.entry(file_id).or_default().push(reference);
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false
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});
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res
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}
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fn search(self, sink: &mut dyn FnMut(FileId, FileReference) -> bool) {
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let _p = profile::span("FindUsages:search");
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let sema = self.sema;
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let search_scope = {
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let base = self.def.search_scope(sema.db);
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match &self.scope {
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None => base,
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Some(scope) => base.intersection(scope),
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}
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};
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let name = match self.def.name(sema.db) {
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Some(it) => it.to_string(),
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None => return,
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};
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let pat = name.as_str();
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for (file_id, search_range) in search_scope {
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let text = sema.db.file_text(file_id);
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let search_range =
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search_range.unwrap_or_else(|| TextRange::up_to(TextSize::of(text.as_str())));
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let tree = Lazy::new(|| sema.parse(file_id).syntax().clone());
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for (idx, _) in text.match_indices(pat) {
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let offset: TextSize = idx.try_into().unwrap();
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if !search_range.contains_inclusive(offset) {
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continue;
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}
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if let Some(name) = sema.find_node_at_offset_with_descend(&tree, offset) {
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match name {
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ast::NameLike::NameRef(name_ref) => {
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if self.found_name_ref(&name_ref, sink) {
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return;
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}
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}
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ast::NameLike::Name(name) => {
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if self.found_name(&name, sink) {
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return;
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}
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}
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ast::NameLike::Lifetime(lifetime) => {
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if self.found_lifetime(&lifetime, sink) {
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return;
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}
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}
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}
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}
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}
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}
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}
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fn found_lifetime(
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&self,
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lifetime: &ast::Lifetime,
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sink: &mut dyn FnMut(FileId, FileReference) -> bool,
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) -> bool {
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match NameRefClass::classify_lifetime(self.sema, lifetime) {
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Some(NameRefClass::Definition(def)) if &def == self.def => {
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let FileRange { file_id, range } = self.sema.original_range(lifetime.syntax());
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let reference = FileReference {
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range,
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name: ast::NameLike::Lifetime(lifetime.clone()),
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access: None,
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};
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sink(file_id, reference)
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}
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_ => false, // not a usage
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}
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}
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fn found_name_ref(
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&self,
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name_ref: &ast::NameRef,
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sink: &mut dyn FnMut(FileId, FileReference) -> bool,
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) -> bool {
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match NameRefClass::classify(self.sema, &name_ref) {
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Some(NameRefClass::Definition(def)) if &def == self.def => {
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let FileRange { file_id, range } = self.sema.original_range(name_ref.syntax());
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let reference = FileReference {
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range,
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name: ast::NameLike::NameRef(name_ref.clone()),
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access: reference_access(&def, &name_ref),
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};
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sink(file_id, reference)
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}
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Some(NameRefClass::FieldShorthand { local_ref: local, field_ref: field }) => {
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let FileRange { file_id, range } = self.sema.original_range(name_ref.syntax());
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let reference = match self.def {
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Definition::Field(_) if &field == self.def => FileReference {
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range,
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name: ast::NameLike::NameRef(name_ref.clone()),
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access: reference_access(&field, &name_ref),
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},
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Definition::Local(l) if &local == l => FileReference {
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range,
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name: ast::NameLike::NameRef(name_ref.clone()),
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access: reference_access(&Definition::Local(local), &name_ref),
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},
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_ => return false, // not a usage
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};
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sink(file_id, reference)
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}
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_ => false, // not a usage
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}
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}
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fn found_name(
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&self,
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name: &ast::Name,
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sink: &mut dyn FnMut(FileId, FileReference) -> bool,
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) -> bool {
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match NameClass::classify(self.sema, name) {
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Some(NameClass::PatFieldShorthand { local_def: _, field_ref })
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if matches!(
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self.def, Definition::Field(_) if &field_ref == self.def
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) =>
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{
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let FileRange { file_id, range } = self.sema.original_range(name.syntax());
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let reference = FileReference {
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range,
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name: ast::NameLike::Name(name.clone()),
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// FIXME: mutable patterns should have `Write` access
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access: Some(ReferenceAccess::Read),
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};
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sink(file_id, reference)
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}
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Some(NameClass::ConstReference(def)) if *self.def == def => {
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let FileRange { file_id, range } = self.sema.original_range(name.syntax());
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let reference =
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FileReference { range, name: ast::NameLike::Name(name.clone()), access: None };
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sink(file_id, reference)
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}
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_ => false, // not a usage
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}
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}
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}
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fn reference_access(def: &Definition, name_ref: &ast::NameRef) -> Option<ReferenceAccess> {
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// Only Locals and Fields have accesses for now.
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if !matches!(def, Definition::Local(_) | Definition::Field(_)) {
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return None;
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}
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let mode = name_ref.syntax().ancestors().find_map(|node| {
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match_ast! {
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match (node) {
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ast::BinExpr(expr) => {
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if expr.op_kind()?.is_assignment() {
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// If the variable or field ends on the LHS's end then it's a Write (covers fields and locals).
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// FIXME: This is not terribly accurate.
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if let Some(lhs) = expr.lhs() {
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if lhs.syntax().text_range().end() == name_ref.syntax().text_range().end() {
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return Some(ReferenceAccess::Write);
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}
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}
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}
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Some(ReferenceAccess::Read)
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},
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_ => None
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}
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}
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});
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// Default Locals and Fields to read
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mode.or(Some(ReferenceAccess::Read))
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}
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