Add parsing benchmark

crates/ide/src/syntax_highlighting/tests.rs

@@ -1,7 +1,8 @@
 use expect_test::{expect_file, ExpectFile};
+use ide_db::SymbolKind;
 use test_utils::{bench, bench_fixture, skip_slow_tests};
 
-use crate::{fixture, FileRange, TextRange};
+use crate::{fixture, FileRange, HlTag, TextRange};
 
 #[test]
 fn test_highlighting() {
@@ -226,7 +227,7 @@ fn bar() {
 }
 
 #[test]
-fn benchmark_syntax_highlighting() {
+fn benchmark_syntax_highlighting_long_struct() {
     if skip_slow_tests() {
         return;
     }
@@ -235,10 +236,36 @@ fn benchmark_syntax_highlighting() {
     let (analysis, file_id) = fixture::file(&fixture);
 
     let hash = {
-        let _pt = bench("syntax highlighting");
-        analysis.highlight(file_id).unwrap().len()
+        let _pt = bench("syntax highlighting long struct");
+        analysis
+            .highlight(file_id)
+            .unwrap()
+            .iter()
+            .filter(|it| it.highlight.tag == HlTag::Symbol(SymbolKind::Struct))
+            .count()
     };
-    assert_eq!(hash, 32009);
+    assert_eq!(hash, 2001);
+}
+
+#[test]
+fn benchmark_syntax_highlighting_parser() {
+    if skip_slow_tests() {
+        return;
+    }
+
+    let fixture = bench_fixture::glorious_old_parser();
+    let (analysis, file_id) = fixture::file(&fixture);
+
+    let hash = {
+        let _pt = bench("syntax highlighting parser");
+        analysis
+            .highlight(file_id)
+            .unwrap()
+            .iter()
+            .filter(|it| it.highlight.tag == HlTag::Symbol(SymbolKind::Function))
+            .count()
+    };
+    assert_eq!(hash, 1629);
 }
 
 #[test]

crates/syntax/src/tests.rs

@@ -4,11 +4,12 @@ use std::{
     path::{Path, PathBuf},
 };
 
+use ast::NameOwner;
 use expect_test::expect_file;
 use rayon::prelude::*;
-use test_utils::project_dir;
+use test_utils::{bench, bench_fixture, project_dir, skip_slow_tests};
 
-use crate::{fuzz, tokenize, SourceFile, SyntaxError, TextRange, TextSize, Token};
+use crate::{ast, fuzz, tokenize, AstNode, SourceFile, SyntaxError, TextRange, TextSize, Token};
 
 #[test]
 fn lexer_tests() {
@@ -41,6 +42,28 @@ fn main() {
     assert!(parse.ok().is_ok());
 }
 
+#[test]
+fn benchmark_parser() {
+    if skip_slow_tests() {
+        return;
+    }
+    let data = bench_fixture::glorious_old_parser();
+    let tree = {
+        let _b = bench("parsing");
+        let p = SourceFile::parse(&data);
+        assert!(p.errors.is_empty());
+        assert_eq!(p.tree().syntax.text_range().len(), 352474.into());
+        p.tree()
+    };
+
+    {
+        let _b = bench("tree traversal");
+        let fn_names =
+            tree.syntax().descendants().filter_map(ast::Fn::cast).filter_map(|f| f.name()).count();
+        assert_eq!(fn_names, 268);
+    }
+}
+
 #[test]
 fn parser_tests() {
     dir_tests(&test_data_dir(), &["parser/inline/ok", "parser/ok"], "rast", |text, path| {
@@ -128,7 +151,6 @@ fn reparse_fuzz_tests() {
 }
 
 /// Test that Rust-analyzer can parse and validate the rust-analyzer
-/// FIXME: Use this as a benchmark
 #[test]
 fn self_hosting_parsing() {
     let dir = project_dir().join("crates");

crates/test_utils/src/bench_fixture.rs

@@ -1,7 +1,11 @@
 //! Generates large snippets of Rust code for usage in the benchmarks.
 
+use std::fs;
+
 use stdx::format_to;
 
+use crate::project_dir;
+
 pub fn big_struct() -> String {
     let n = 1_000;
 
@@ -26,3 +30,8 @@ struct S{} {{
 
     buf
 }
+
+pub fn glorious_old_parser() -> String {
+    let path = project_dir().join("bench_data/glorious_old_parser");
+    fs::read_to_string(&path).unwrap()
+}