6 files changed, 76 insertions, 262 deletions

diff --git a/crates/rust-analyzer/src/benchmarks.rs b/crates/rust-analyzer/src/benchmarks.rs
new file mode 100644
index 000000000..a6f997af8
--- /dev/null
+++ b/crates/rust-analyzer/src/benchmarks.rs
@@ -0,0 +1,69 @@
+//! Fully integrated benchmarks for rust-analyzer, which load real cargo
+//! projects.
+//!
+//! The benchmark here is used to debug specific performance regressions. If you
+//! notice that, eg, completion is slow in some specific case, you can  modify
+//! code here exercise this specific completion, and thus have a fast
+//! edit/compile/test cycle.
+//!
+//! Note that "Rust Analyzer: Run" action does not allow running a single test
+//! in release mode in VS Code. There's however "Rust Analyzer: Copy Run Command Line"
+//! which you can use to paste the command in terminal and add `--release` manually.
+
+use std::sync::Arc;
+
+use ide::Change;
+use test_utils::project_root;
+use vfs::{AbsPathBuf, VfsPath};
+
+use crate::cli::load_cargo::{load_workspace_at, LoadCargoConfig};
+
+#[test]
+fn benchmark_integrated_highlighting() {
+    // Don't run slow benchmark by default
+    if true {
+        return;
+    }
+
+    // Load rust-analyzer itself.
+    let workspace_to_load = project_root();
+    let file = "./crates/ide_db/src/apply_change.rs";
+
+    let cargo_config = Default::default();
+    let load_cargo_config =
+        LoadCargoConfig { load_out_dirs_from_check: true, with_proc_macro: false };
+
+    let (mut host, vfs, _proc_macro) = {
+        let _it = stdx::timeit("workspace loading");
+        load_workspace_at(&workspace_to_load, &cargo_config, &load_cargo_config, &|_| {}).unwrap()
+    };
+
+    let file_id = {
+        let file = workspace_to_load.join(file);
+        let path = VfsPath::from(AbsPathBuf::assert(file));
+        vfs.file_id(&path).unwrap_or_else(|| panic!("can't find virtual file for {}", path))
+    };
+
+    {
+        let _it = stdx::timeit("initial");
+        let analysis = host.analysis();
+        analysis.highlight_as_html(file_id, false).unwrap();
+    }
+
+    profile::init_from("*>100");
+
+    {
+        let _it = stdx::timeit("change");
+        let mut text = host.analysis().file_text(file_id).unwrap().to_string();
+        text.push_str("\npub fn _dummy() {}\n");
+        let mut change = Change::new();
+        change.change_file(file_id, Some(Arc::new(text)));
+        host.apply_change(change);
+    }
+
+    {
+        let _it = stdx::timeit("after change");
+        let analysis = host.analysis();
+        analysis.highlight_as_html(file_id, false).unwrap();
+    }
+}
diff --git a/crates/rust-analyzer/src/bin/flags.rs b/crates/rust-analyzer/src/bin/flags.rs
index d8987633d..b05fc00b9 100644
--- a/crates/rust-analyzer/src/bin/flags.rs
+++ b/crates/rust-analyzer/src/bin/flags.rs
@@ -1,10 +1,9 @@
 //! Grammar for the command-line arguments.
 #![allow(unreachable_pub)]
-use std::{env, path::PathBuf};
+use std::path::PathBuf;
 
 use ide_ssr::{SsrPattern, SsrRule};
-use rust_analyzer::cli::{BenchWhat, Position, Verbosity};
-use vfs::AbsPathBuf;
+use rust_analyzer::cli::Verbosity;
 
 xflags::xflags! {
     src "./src/bin/flags.rs"
@@ -74,27 +73,6 @@ xflags::xflags! {
             optional --with-proc-macro
         }
 
-        /// Benchmark specific analysis operation
-        cmd analysis-bench
-            /// Directory with Cargo.toml.
-            required path: PathBuf
-        {
-            /// Collect memory usage statistics.
-            optional --memory-usage
-
-            /// Compute syntax highlighting for this file
-            optional --highlight path: PathBuf
-            /// Compute completions at file:line:column location.
-            optional --complete location: Position
-            /// Compute goto definition at file:line:column location.
-            optional --goto-def location: Position
-
-            /// Load OUT_DIR values by running `cargo check` before analysis.
-            optional --load-output-dirs
-            /// Use proc-macro-srv for proc-macro expanding.
-            optional --with-proc-macro
-        }
-
         cmd diagnostics
             /// Directory with Cargo.toml.
             required path: PathBuf
@@ -142,7 +120,6 @@ pub enum RustAnalyzerCmd {
     Symbols(Symbols),
     Highlight(Highlight),
     AnalysisStats(AnalysisStats),
-    AnalysisBench(AnalysisBench),
     Diagnostics(Diagnostics),
     Ssr(Ssr),
     Search(Search),
@@ -184,18 +161,6 @@ pub struct AnalysisStats {
 }
 
 #[derive(Debug)]
-pub struct AnalysisBench {
-    pub path: PathBuf,
-
-    pub memory_usage: bool,
-    pub highlight: Option<PathBuf>,
-    pub complete: Option<Position>,
-    pub goto_def: Option<Position>,
-    pub load_output_dirs: bool,
-    pub with_proc_macro: bool,
-}
-
-#[derive(Debug)]
 pub struct Diagnostics {
     pub path: PathBuf,
 
@@ -239,17 +204,3 @@ impl RustAnalyzer {
         }
     }
 }
-
-impl AnalysisBench {
-    pub(crate) fn what(&self) -> BenchWhat {
-        match (&self.highlight, &self.complete, &self.goto_def) {
-            (Some(path), None, None) => {
-                let path = env::current_dir().unwrap().join(path);
-                BenchWhat::Highlight { path: AbsPathBuf::assert(path) }
-            }
-            (None, Some(position), None) => BenchWhat::Complete(position.clone()),
-            (None, None, Some(position)) => BenchWhat::GotoDef(position.clone()),
-            _ => panic!("exactly one of  `--highlight`, `--complete` or `--goto-def` must be set"),
-        }
-    }
-}
diff --git a/crates/rust-analyzer/src/bin/main.rs b/crates/rust-analyzer/src/bin/main.rs
index a0b611bff..ae99eefe3 100644
--- a/crates/rust-analyzer/src/bin/main.rs
+++ b/crates/rust-analyzer/src/bin/main.rs
@@ -9,7 +9,7 @@ use std::{convert::TryFrom, env, fs, path::Path, process};
 use lsp_server::Connection;
 use project_model::ProjectManifest;
 use rust_analyzer::{
-    cli::{self, AnalysisStatsCmd, BenchCmd},
+    cli::{self, AnalysisStatsCmd},
     config::Config,
     from_json,
     lsp_ext::supports_utf8,
@@ -80,17 +80,6 @@ fn try_main() -> Result<()> {
             with_proc_macro: cmd.with_proc_macro,
         }
         .run(verbosity)?,
-        flags::RustAnalyzerCmd::AnalysisBench(cmd) => {
-            let what = cmd.what();
-            BenchCmd {
-                memory_usage: cmd.memory_usage,
-                path: cmd.path,
-                load_output_dirs: cmd.load_output_dirs,
-                with_proc_macro: cmd.with_proc_macro,
-                what,
-            }
-            .run(verbosity)?
-        }
 
         flags::RustAnalyzerCmd::Diagnostics(cmd) => {
             cli::diagnostics(&cmd.path, cmd.load_output_dirs, cmd.with_proc_macro)?
diff --git a/crates/rust-analyzer/src/cli.rs b/crates/rust-analyzer/src/cli.rs
index ed732eb38..76b666dc2 100644
--- a/crates/rust-analyzer/src/cli.rs
+++ b/crates/rust-analyzer/src/cli.rs
@@ -1,8 +1,7 @@
 //! Various batch processing tasks, intended primarily for debugging.
 
-mod load_cargo;
+pub(crate) mod load_cargo;
 mod analysis_stats;
-mod analysis_bench;
 mod diagnostics;
 mod progress_report;
 mod ssr;
@@ -15,7 +14,6 @@ use syntax::{AstNode, SourceFile};
 use vfs::Vfs;
 
 pub use self::{
-    analysis_bench::{BenchCmd, BenchWhat, Position},
     analysis_stats::AnalysisStatsCmd,
     diagnostics::diagnostics,
     load_cargo::{load_workspace, load_workspace_at, LoadCargoConfig},
diff --git a/crates/rust-analyzer/src/cli/analysis_bench.rs b/crates/rust-analyzer/src/cli/analysis_bench.rs
deleted file mode 100644
index 49994824f..000000000
--- a/crates/rust-analyzer/src/cli/analysis_bench.rs
+++ /dev/null
@@ -1,196 +0,0 @@
-//! Benchmark operations like highlighting or goto definition.
-
-use std::{env, path::PathBuf, str::FromStr, sync::Arc, time::Instant};
-
-use anyhow::{bail, format_err, Result};
-use hir::PrefixKind;
-use ide::{
-    Analysis, AnalysisHost, Change, CompletionConfig, DiagnosticsConfig, FilePosition, LineCol,
-};
-use ide_db::{
-    base_db::{
-        salsa::{Database, Durability},
-        FileId,
-    },
-    helpers::{insert_use::InsertUseConfig, SnippetCap},
-};
-use vfs::AbsPathBuf;
-
-use crate::cli::{
-    load_cargo::{load_workspace_at, LoadCargoConfig},
-    print_memory_usage, Verbosity,
-};
-
-pub struct BenchCmd {
-    pub path: PathBuf,
-    pub what: BenchWhat,
-    pub memory_usage: bool,
-    pub load_output_dirs: bool,
-    pub with_proc_macro: bool,
-}
-
-pub enum BenchWhat {
-    Highlight { path: AbsPathBuf },
-    Complete(Position),
-    GotoDef(Position),
-}
-
-#[derive(Debug, Clone)]
-pub struct Position {
-    pub path: AbsPathBuf,
-    pub line: u32,
-    pub column: u32,
-}
-
-impl FromStr for Position {
-    type Err = anyhow::Error;
-    fn from_str(s: &str) -> Result<Self> {
-        let mut split = s.rsplitn(3, ':');
-        match (split.next(), split.next(), split.next()) {
-            (Some(column), Some(line), Some(path)) => {
-                let path = env::current_dir().unwrap().join(path);
-                let path = AbsPathBuf::assert(path);
-                Ok(Position { path, line: line.parse()?, column: column.parse()? })
-            }
-            _ => bail!("position should be in file:line:column format: {:?}", s),
-        }
-    }
-}
-
-impl BenchCmd {
-    pub fn run(self, verbosity: Verbosity) -> Result<()> {
-        profile::init();
-
-        let start = Instant::now();
-        eprint!("loading: ");
-
-        let cargo_config = Default::default();
-        let load_cargo_config = LoadCargoConfig {
-            load_out_dirs_from_check: self.load_output_dirs,
-            with_proc_macro: self.with_proc_macro,
-        };
-        let (mut host, vfs, _proc_macro) =
-            load_workspace_at(&self.path, &cargo_config, &load_cargo_config, &|_| {})?;
-        eprintln!("{:?}\n", start.elapsed());
-
-        let file_id = {
-            let path = match &self.what {
-                BenchWhat::Highlight { path } => path,
-                BenchWhat::Complete(pos) | BenchWhat::GotoDef(pos) => &pos.path,
-            };
-            let path = path.clone().into();
-            vfs.file_id(&path).ok_or_else(|| format_err!("Can't find {}", path))?
-        };
-
-        match &self.what {
-            BenchWhat::Highlight { .. } => {
-                let res = do_work(&mut host, file_id, |analysis| {
-                    analysis.diagnostics(&DiagnosticsConfig::default(), file_id).unwrap();
-                    analysis.highlight_as_html(file_id, false).unwrap()
-                });
-                if verbosity.is_verbose() {
-                    println!("\n{}", res);
-                }
-            }
-            BenchWhat::Complete(pos) | BenchWhat::GotoDef(pos) => {
-                let is_completion = matches!(self.what, BenchWhat::Complete(..));
-
-                let offset = host
-                    .analysis()
-                    .file_line_index(file_id)?
-                    .offset(LineCol { line: pos.line - 1, col: pos.column });
-                let file_position = FilePosition { file_id, offset };
-
-                if is_completion {
-                    let options = CompletionConfig {
-                        enable_postfix_completions: true,
-                        enable_imports_on_the_fly: true,
-                        add_call_parenthesis: true,
-                        add_call_argument_snippets: true,
-                        snippet_cap: SnippetCap::new(true),
-                        insert_use: InsertUseConfig {
-                            merge: None,
-                            prefix_kind: PrefixKind::Plain,
-                            group: true,
-                        },
-                    };
-                    let res = do_work(&mut host, file_id, |analysis| {
-                        analysis.completions(&options, file_position)
-                    });
-                    if verbosity.is_verbose() {
-                        println!("\n{:#?}", res);
-                    }
-                } else {
-                    let res = do_work(&mut host, file_id, |analysis| {
-                        analysis.goto_definition(file_position)
-                    });
-                    if verbosity.is_verbose() {
-                        println!("\n{:#?}", res);
-                    }
-                }
-            }
-        }
-
-        if self.memory_usage {
-            print_memory_usage(host, vfs);
-        }
-
-        Ok(())
-    }
-}
-
-fn do_work<F: Fn(&Analysis) -> T, T>(host: &mut AnalysisHost, file_id: FileId, work: F) -> T {
-    {
-        let start = Instant::now();
-        eprint!("from scratch:   ");
-        work(&host.analysis());
-        eprintln!("{:?}", start.elapsed());
-    }
-    {
-        let start = Instant::now();
-        eprint!("no change:      ");
-        work(&host.analysis());
-        eprintln!("{:?}", start.elapsed());
-    }
-    {
-        let start = Instant::now();
-        eprint!("trivial change: ");
-        host.raw_database_mut().salsa_runtime_mut().synthetic_write(Durability::LOW);
-        work(&host.analysis());
-        eprintln!("{:?}", start.elapsed());
-    }
-    {
-        let start = Instant::now();
-        eprint!("comment change: ");
-        {
-            let mut text = host.analysis().file_text(file_id).unwrap().to_string();
-            text.push_str("\n/* Hello world */\n");
-            let mut change = Change::new();
-            change.change_file(file_id, Some(Arc::new(text)));
-            host.apply_change(change);
-        }
-        work(&host.analysis());
-        eprintln!("{:?}", start.elapsed());
-    }
-    {
-        let start = Instant::now();
-        eprint!("item change:    ");
-        {
-            let mut text = host.analysis().file_text(file_id).unwrap().to_string();
-            text.push_str("\npub fn _dummy() {}\n");
-            let mut change = Change::new();
-            change.change_file(file_id, Some(Arc::new(text)));
-            host.apply_change(change);
-        }
-        work(&host.analysis());
-        eprintln!("{:?}", start.elapsed());
-    }
-    {
-        let start = Instant::now();
-        eprint!("const change:   ");
-        host.raw_database_mut().salsa_runtime_mut().synthetic_write(Durability::HIGH);
-        let res = work(&host.analysis());
-        eprintln!("{:?}", start.elapsed());
-        res
-    }
-}
diff --git a/crates/rust-analyzer/src/lib.rs b/crates/rust-analyzer/src/lib.rs
index 8b874239c..d9a5030a0 100644
--- a/crates/rust-analyzer/src/lib.rs
+++ b/crates/rust-analyzer/src/lib.rs
@@ -39,6 +39,9 @@ mod op_queue;
 pub mod lsp_ext;
 pub mod config;
 
+#[cfg(test)]
+mod benchmarks;
+
 use serde::de::DeserializeOwned;
 use std::fmt;