2 files changed, 130 insertions, 33 deletions

diff --git a/crates/ra_ide_api/src/status.rs b/crates/ra_ide_api/src/status.rs
index c184ca892..717537fcd 100644
--- a/crates/ra_ide_api/src/status.rs
+++ b/crates/ra_ide_api/src/status.rs
@@ -1,61 +1,149 @@
-use std::fmt;
+use std::{
+    fmt,
+    iter::FromIterator,
+    sync::Arc,
+};
 
-use ra_syntax::AstNode;
+use ra_syntax::{AstNode, TreeArc, SourceFile};
 use ra_db::{
-    SourceFileQuery,
-    salsa::{Database, debug::DebugQueryTable},
+    SourceFileQuery, FileTextQuery, SourceRootId,
+    salsa::{Database, debug::{DebugQueryTable, TableEntry}},
 };
 
-use crate::db::RootDatabase;
+use crate::{
+    FileId, db::RootDatabase,
+    symbol_index::{SymbolIndex, LibrarySymbolsQuery},
+};
 
 pub(crate) fn status(db: &RootDatabase) -> String {
-    let file_stats = {
-        let mut stats = FilesStats::default();
-        for entry in db.query(SourceFileQuery).entries::<Vec<_>>() {
-            stats.total += 1;
-            if let Some(value) = entry.value {
-                stats.retained += 1;
-                stats.retained_size = stats
-                    .retained_size
-                    .checked_add(value.syntax().memory_size_of_subtree())
-                    .unwrap();
-            }
-        }
-        stats
-    };
+    let files_stats = db.query(FileTextQuery).entries::<FilesStats>();
+    let syntax_tree_stats = db.query(SourceFileQuery).entries::<SyntaxTreeStats>();
+    let symbols_stats = db
+        .query(LibrarySymbolsQuery)
+        .entries::<LibrarySymbolsStats>();
     let n_defs = {
         let interner: &hir::HirInterner = db.as_ref();
         interner.len()
     };
-    format!("{}\nn_defs {}\n", file_stats, n_defs)
+    format!(
+        "{}\n{}\n{}\nn_defs {}\n",
+        files_stats, symbols_stats, syntax_tree_stats, n_defs
+    )
 }
 
 #[derive(Default)]
 struct FilesStats {
     total: usize,
-    retained: usize,
-    retained_size: usize,
+    size: Bytes,
 }
 
 impl fmt::Display for FilesStats {
     fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-        let (size, suff) = human_bytes(self.retained_size);
+        write!(fmt, "{} ({}) files", self.total, self.size)
+    }
+}
+
+impl FromIterator<TableEntry<FileId, Arc<String>>> for FilesStats {
+    fn from_iter<T>(iter: T) -> FilesStats
+    where
+        T: IntoIterator<Item = TableEntry<FileId, Arc<String>>>,
+    {
+        let mut res = FilesStats::default();
+        for entry in iter {
+            res.total += 1;
+            res.size += entry.value.unwrap().len();
+        }
+        res
+    }
+}
+
+#[derive(Default)]
+struct SyntaxTreeStats {
+    total: usize,
+    retained: usize,
+    retained_size: Bytes,
+}
+
+impl fmt::Display for SyntaxTreeStats {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
         write!(
             fmt,
-            "{} parsed_files, {} ({}{}) retained",
-            self.total, self.retained, size, suff
+            "{} trees, {} ({}) retained",
+            self.total, self.retained, self.retained_size,
         )
     }
 }
 
-fn human_bytes(bytes: usize) -> (usize, &'static str) {
-    if bytes < 4096 {
-        return (bytes, " bytes");
+impl FromIterator<TableEntry<FileId, TreeArc<SourceFile>>> for SyntaxTreeStats {
+    fn from_iter<T>(iter: T) -> SyntaxTreeStats
+    where
+        T: IntoIterator<Item = TableEntry<FileId, TreeArc<SourceFile>>>,
+    {
+        let mut res = SyntaxTreeStats::default();
+        for entry in iter {
+            res.total += 1;
+            if let Some(value) = entry.value {
+                res.retained += 1;
+                res.retained_size += value.syntax().memory_size_of_subtree();
+            }
+        }
+        res
     }
-    let kb = bytes / 1024;
-    if kb < 4096 {
-        return (kb, "kb");
+}
+
+#[derive(Default)]
+struct LibrarySymbolsStats {
+    total: usize,
+    fst_size: Bytes,
+    symbols_size: Bytes,
+}
+
+impl fmt::Display for LibrarySymbolsStats {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        write!(
+            fmt,
+            "{} ({} + {}) symbols",
+            self.total, self.fst_size, self.symbols_size
+        )
+    }
+}
+
+impl FromIterator<TableEntry<SourceRootId, Arc<SymbolIndex>>> for LibrarySymbolsStats {
+    fn from_iter<T>(iter: T) -> LibrarySymbolsStats
+    where
+        T: IntoIterator<Item = TableEntry<SourceRootId, Arc<SymbolIndex>>>,
+    {
+        let mut res = LibrarySymbolsStats::default();
+        for entry in iter {
+            let value = entry.value.unwrap();
+            res.total += value.len();
+            res.fst_size += value.fst_size();
+            res.symbols_size += value.symbols_size();
+        }
+        res
+    }
+}
+
+#[derive(Default)]
+struct Bytes(usize);
+
+impl fmt::Display for Bytes {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        let bytes = self.0;
+        if bytes < 4096 {
+            return write!(f, "{} bytes", bytes);
+        }
+        let kb = bytes / 1024;
+        if kb < 4096 {
+            return write!(f, "{}kb", kb);
+        }
+        let mb = kb / 1024;
+        write!(f, "{}mb", mb)
+    }
+}
+
+impl std::ops::AddAssign<usize> for Bytes {
+    fn add_assign(&mut self, x: usize) {
+        self.0 += x;
     }
-    let mb = kb / 1024;
-    (mb, "mb")
 }
diff --git a/crates/ra_ide_api/src/symbol_index.rs b/crates/ra_ide_api/src/symbol_index.rs
index 1b5d1eb1d..69a669b8d 100644
--- a/crates/ra_ide_api/src/symbol_index.rs
+++ b/crates/ra_ide_api/src/symbol_index.rs
@@ -23,6 +23,7 @@ use std::{
     cmp::Ordering,
     hash::{Hash, Hasher},
     sync::Arc,
+    mem,
 };
 
 use fst::{self, Streamer};
@@ -136,6 +137,14 @@ impl SymbolIndex {
         self.symbols.len()
     }
 
+    pub(crate) fn fst_size(&self) -> usize {
+        self.map.as_fst().size()
+    }
+
+    pub(crate) fn symbols_size(&self) -> usize {
+        self.symbols.len() * mem::size_of::<FileSymbol>()
+    }
+
     pub(crate) fn for_files(
         files: impl ParallelIterator<Item = (FileId, TreeArc<SourceFile>)>,
     ) -> SymbolIndex {