Merge #6830

6830: Avoid panic when collecting memory metrics r=jonas-schievink a=jonas-schievink

This is getting hit during metrics collection.

bors r+

Co-authored-by: Jonas Schievink <jonasschievink@gmail.com>

crates/rust-analyzer/src/cli.rs

@@ -10,8 +10,9 @@ mod ssr;
 use std::io::Read;
 
 use anyhow::Result;
-use ide::Analysis;
+use ide::{Analysis, AnalysisHost};
 use syntax::{AstNode, SourceFile};
+use vfs::Vfs;
 
 pub use self::{
     analysis_bench::{BenchCmd, BenchWhat, Position},
@@ -82,3 +83,23 @@ fn report_metric(metric: &str, value: u64, unit: &str) {
     }
     println!("METRIC:{}:{}:{}", metric, value, unit)
 }
+
+fn print_memory_usage(mut host: AnalysisHost, vfs: Vfs) {
+    let mut mem = host.per_query_memory_usage();
+
+    let before = profile::memory_usage();
+    drop(vfs);
+    let vfs = before.allocated - profile::memory_usage().allocated;
+    mem.push(("VFS".into(), vfs));
+
+    let before = profile::memory_usage();
+    drop(host);
+    mem.push(("Unaccounted".into(), before.allocated - profile::memory_usage().allocated));
+
+    mem.push(("Remaining".into(), profile::memory_usage().allocated));
+
+    for (name, bytes) in mem {
+        // NOTE: Not a debug print, so avoid going through the `eprintln` defined above.
+        eprintln!("{:>8} {}", bytes, name);
+    }
+}

crates/rust-analyzer/src/cli/analysis_bench.rs

@@ -12,10 +12,7 @@ use ide_db::base_db::{
 };
 use vfs::AbsPathBuf;
 
-use crate::{
-    cli::{load_cargo::load_cargo, Verbosity},
-    print_memory_usage,
-};
+use crate::cli::{load_cargo::load_cargo, print_memory_usage, Verbosity};
 
 pub struct BenchCmd {
     pub path: PathBuf,

crates/rust-analyzer/src/cli/analysis_stats.rs

@@ -23,11 +23,9 @@ use rustc_hash::FxHashSet;
 use stdx::format_to;
 use syntax::AstNode;
 
-use crate::{
-    cli::{
-        load_cargo::load_cargo, progress_report::ProgressReport, report_metric, Result, Verbosity,
-    },
-    print_memory_usage,
+use crate::cli::{
+    load_cargo::load_cargo, print_memory_usage, progress_report::ProgressReport, report_metric,
+    Result, Verbosity,
 };
 use profile::StopWatch;
 

crates/rust-analyzer/src/lib.rs

@@ -37,10 +37,8 @@ mod document;
 pub mod lsp_ext;
 pub mod config;
 
-use ide::AnalysisHost;
 use serde::de::DeserializeOwned;
 use std::fmt;
-use vfs::Vfs;
 
 pub use crate::{caps::server_capabilities, main_loop::main_loop};
 
@@ -72,22 +70,3 @@ impl fmt::Display for LspError {
 }
 
 impl std::error::Error for LspError {}
-
-fn print_memory_usage(mut host: AnalysisHost, vfs: Vfs) {
-    let mut mem = host.per_query_memory_usage();
-
-    let before = profile::memory_usage();
-    drop(vfs);
-    let vfs = before.allocated - profile::memory_usage().allocated;
-    mem.push(("VFS".into(), vfs));
-
-    let before = profile::memory_usage();
-    drop(host);
-    mem.push(("Unaccounted".into(), before.allocated - profile::memory_usage().allocated));
-
-    mem.push(("Remaining".into(), profile::memory_usage().allocated));
-
-    for (name, bytes) in mem {
-        eprintln!("{:>8} {}", bytes, name);
-    }
-}

xtask/src/metrics.rs

@@ -3,7 +3,6 @@ use std::{
     env,
     io::Write as _,
     path::Path,
-    process::{Command, Stdio},
     time::{Instant, SystemTime, UNIX_EPOCH},
 };
 
@@ -82,11 +81,9 @@ impl Metrics {
     }
     fn measure_analysis_stats_path(&mut self, name: &str, path: &str) -> Result<()> {
         eprintln!("\nMeasuring analysis-stats/{}", name);
-        let output = Command::new("./target/release/rust-analyzer")
-            .args(&["analysis-stats", "--quiet", "--memory-usage", path])
-            .stderr(Stdio::inherit())
-            .output()?;
-        let output = String::from_utf8(output.stdout)?;
+        let output =
+            cmd!("./target/release/rust-analyzer analysis-stats --quiet --memory-usage {path}")
+                .read()?;
         for (metric, value, unit) in parse_metrics(&output) {
             self.report(&format!("analysis-stats/{}/{}", name, metric), value, unit.into());
         }