crates/rust-analyzer/src/integrated_benchmarks.rs

   1 //! Fully integrated benchmarks for rust-analyzer, which load real cargo
   2 //! projects.
   3 //!
   4 //! The benchmark here is used to debug specific performance regressions. If you
   5 //! notice that, eg, completion is slow in some specific case, you can  modify
   6 //! code here exercise this specific completion, and thus have a fast
   7 //! edit/compile/test cycle.
   8 //!
   9 //! Note that "Rust Analyzer: Run" action does not allow running a single test
  10 //! in release mode in VS Code. There's however "Rust Analyzer: Copy Run Command Line"
  11 //! which you can use to paste the command in terminal and add `--release` manually.
  12
  13 use std::{convert::TryFrom, sync::Arc};
  14
  15 use ide::{Change, CompletionConfig, FilePosition, TextSize};
  16 use ide_db::helpers::{
  17     insert_use::{ImportGranularity, InsertUseConfig},
  18     SnippetCap,
  19 };
  20 use test_utils::project_root;
  21 use vfs::{AbsPathBuf, VfsPath};
  22
  23 use crate::cli::load_cargo::{load_workspace_at, LoadCargoConfig};
  24
  25 #[test]
  26 fn integrated_highlighting_benchmark() {
  27     if std::env::var("RUN_SLOW_BENCHES").is_err() {
  28         return;
  29     }
  30
  31     // Load rust-analyzer itself.
  32     let workspace_to_load = project_root();
  33     let file = "./crates/ide_db/src/apply_change.rs";
  34
  35     let cargo_config = Default::default();
  36     let load_cargo_config = LoadCargoConfig {
  37         load_out_dirs_from_check: true,
  38         wrap_rustc: false,
  39         with_proc_macro: false,
  40     };
  41
  42     let (mut host, vfs, _proc_macro) = {
  43         let _it = stdx::timeit("workspace loading");
  44         load_workspace_at(&workspace_to_load, &cargo_config, &load_cargo_config, &|_| {}).unwrap()
  45     };
  46
  47     let file_id = {
  48         let file = workspace_to_load.join(file);
  49         let path = VfsPath::from(AbsPathBuf::assert(file));
  50         vfs.file_id(&path).unwrap_or_else(|| panic!("can't find virtual file for {}", path))
  51     };
  52
  53     {
  54         let _it = stdx::timeit("initial");
  55         let analysis = host.analysis();
  56         analysis.highlight_as_html(file_id, false).unwrap();
  57     }
  58
  59     profile::init_from("*>100");
  60     // let _s = profile::heartbeat_span();
  61
  62     {
  63         let _it = stdx::timeit("change");
  64         let mut text = host.analysis().file_text(file_id).unwrap().to_string();
  65         text.push_str("\npub fn _dummy() {}\n");
  66         let mut change = Change::new();
  67         change.change_file(file_id, Some(Arc::new(text)));
  68         host.apply_change(change);
  69     }
  70
  71     {
  72         let _it = stdx::timeit("after change");
  73         let _span = profile::cpu_span();
  74         let analysis = host.analysis();
  75         analysis.highlight_as_html(file_id, false).unwrap();
  76     }
  77 }
  78
  79 #[test]
  80 fn integrated_completion_benchmark() {
  81     if std::env::var("RUN_SLOW_BENCHES").is_err() {
  82         return;
  83     }
  84
  85     // Load rust-analyzer itself.
  86     let workspace_to_load = project_root();
  87     let file = "./crates/hir/src/lib.rs";
  88
  89     let cargo_config = Default::default();
  90     let load_cargo_config = LoadCargoConfig {
  91         load_out_dirs_from_check: true,
  92         wrap_rustc: false,
  93         with_proc_macro: false,
  94     };
  95
  96     let (mut host, vfs, _proc_macro) = {
  97         let _it = stdx::timeit("workspace loading");
  98         load_workspace_at(&workspace_to_load, &cargo_config, &load_cargo_config, &|_| {}).unwrap()
  99     };
 100
 101     let file_id = {
 102         let file = workspace_to_load.join(file);
 103         let path = VfsPath::from(AbsPathBuf::assert(file));
 104         vfs.file_id(&path).unwrap_or_else(|| panic!("can't find virtual file for {}", path))
 105     };
 106
 107     {
 108         let _it = stdx::timeit("initial");
 109         let analysis = host.analysis();
 110         analysis.highlight_as_html(file_id, false).unwrap();
 111     }
 112
 113     profile::init_from("*>5");
 114     // let _s = profile::heartbeat_span();
 115
 116     let completion_offset = {
 117         let _it = stdx::timeit("change");
 118         let mut text = host.analysis().file_text(file_id).unwrap().to_string();
 119         let completion_offset =
 120             patch(&mut text, "db.struct_data(self.id)", "sel;\ndb.struct_data(self.id)")
 121                 + "sel".len();
 122         let mut change = Change::new();
 123         change.change_file(file_id, Some(Arc::new(text)));
 124         host.apply_change(change);
 125         completion_offset
 126     };
 127
 128     {
 129         let _p = profile::span("unqualified path completion");
 130         let _span = profile::cpu_span();
 131         let analysis = host.analysis();
 132         let config = CompletionConfig {
 133             enable_postfix_completions: true,
 134             enable_imports_on_the_fly: true,
 135             add_call_parenthesis: true,
 136             add_call_argument_snippets: true,
 137             snippet_cap: SnippetCap::new(true),
 138             insert_use: InsertUseConfig {
 139                 granularity: ImportGranularity::Crate,
 140                 prefix_kind: hir::PrefixKind::ByCrate,
 141                 enforce_granularity: true,
 142                 group: true,
 143             },
 144         };
 145         let position =
 146             FilePosition { file_id, offset: TextSize::try_from(completion_offset).unwrap() };
 147         analysis.completions(&config, position).unwrap();
 148     }
 149
 150     let completion_offset = {
 151         let _it = stdx::timeit("change");
 152         let mut text = host.analysis().file_text(file_id).unwrap().to_string();
 153         let completion_offset =
 154             patch(&mut text, "sel;\ndb.struct_data(self.id)", "self.;\ndb.struct_data(self.id)")
 155                 + "self.".len();
 156         let mut change = Change::new();
 157         change.change_file(file_id, Some(Arc::new(text)));
 158         host.apply_change(change);
 159         completion_offset
 160     };
 161
 162     {
 163         let _p = profile::span("dot completion");
 164         let _span = profile::cpu_span();
 165         let analysis = host.analysis();
 166         let config = CompletionConfig {
 167             enable_postfix_completions: true,
 168             enable_imports_on_the_fly: true,
 169             add_call_parenthesis: true,
 170             add_call_argument_snippets: true,
 171             snippet_cap: SnippetCap::new(true),
 172             insert_use: InsertUseConfig {
 173                 granularity: ImportGranularity::Crate,
 174                 prefix_kind: hir::PrefixKind::ByCrate,
 175                 enforce_granularity: true,
 176                 group: true,
 177             },
 178         };
 179         let position =
 180             FilePosition { file_id, offset: TextSize::try_from(completion_offset).unwrap() };
 181         analysis.completions(&config, position).unwrap();
 182     }
 183 }
 184
 185 fn patch(what: &mut String, from: &str, to: &str) -> usize {
 186     let idx = what.find(from).unwrap();
 187     *what = what.replacen(from, to, 1);
 188     idx
 189 }