From d621533f15871ce233e3a1dcc0fb10a631090678 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Wed, 26 Jun 2019 11:11:28 +0300
Subject: add cpuprofile to ra_prof

Now, one can use `let _p = ra_prof::cpu_profiler()` to capture profile
of a block of code.

This is not an out of the box experience, as that relies on gperfools

See the docs on https://github.com/AtheMathmo/cpuprofiler for more!
---
 crates/ra_batch/Cargo.toml |  4 ++++
 crates/ra_prof/Cargo.toml  |  1 +
 crates/ra_prof/src/lib.rs  | 33 +++++++++++++++++++++++++++++++++
 3 files changed, 38 insertions(+)

(limited to 'crates')

diff --git a/crates/ra_batch/Cargo.toml b/crates/ra_batch/Cargo.toml
index 7d8837fc3..f521937c5 100644
--- a/crates/ra_batch/Cargo.toml
+++ b/crates/ra_batch/Cargo.toml
@@ -15,5 +15,9 @@ ra_ide_api = { path = "../ra_ide_api" }
 ra_hir = { path = "../ra_hir" }
 ra_project_model = { path = "../ra_project_model" }
 
+[dependencies.ra_prof]
+path = "../ra_prof"
+# features = [ "cpuprofiler" ]
+
 [dev-dependencies]
 test_utils = { path = "../test_utils" }
diff --git a/crates/ra_prof/Cargo.toml b/crates/ra_prof/Cargo.toml
index d55af18f5..787e18385 100644
--- a/crates/ra_prof/Cargo.toml
+++ b/crates/ra_prof/Cargo.toml
@@ -9,3 +9,4 @@ publish = false
 once_cell = "0.2.0"
 itertools = "0.8.0"
 backtrace = "0.3.28"
+cpuprofiler = { version = "0.0.3", optional = true }
diff --git a/crates/ra_prof/src/lib.rs b/crates/ra_prof/src/lib.rs
index de67b4031..1e8d780ab 100644
--- a/crates/ra_prof/src/lib.rs
+++ b/crates/ra_prof/src/lib.rs
@@ -255,6 +255,39 @@ impl Drop for Scope {
     }
 }
 
+/// A wrapper around https://github.com/AtheMathmo/cpuprofiler
+///
+/// It can be used to capture sampling profiles of sections of code.
+/// It is not exactly out-of-the-box, as it relies on gperftools.
+/// See the docs for the crate for more!
+#[derive(Debug)]
+pub struct CpuProfiler {
+    _private: (),
+}
+
+pub fn cpu_profiler() -> CpuProfiler {
+    #[cfg(feature = "cpuprofiler")]
+    {
+        cpuprofiler::PROFILER.lock().unwrap().start("./out.profile").unwrap();
+    }
+
+    #[cfg(not(feature = "cpuprofiler"))]
+    {
+        eprintln!("cpuprofiler feature is disabled")
+    }
+
+    CpuProfiler { _private: () }
+}
+
+impl Drop for CpuProfiler {
+    fn drop(&mut self) {
+        #[cfg(feature = "cpuprofiler")]
+        {
+            cpuprofiler::PROFILER.lock().unwrap().stop().unwrap();
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
-- 
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