From 6070faa2de1fe7b388eb048c70773b4c277cd438 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cyryl=20P=C5=82otnicki?= <cyplo@cyplo.net>
Date: Sat, 28 Nov 2020 13:28:00 +0000
Subject: [PATCH] Add perf

---
 .gitignore            |  3 +++
 Cargo.toml            |  2 ++
 scripts/rust-unmangle | 32 ++++++++++++++++++++++++++++++++
 shell.nix             |  1 +
 4 files changed, 38 insertions(+)
 create mode 100755 scripts/rust-unmangle

diff --git a/.gitignore b/.gitignore
index 332008f..b294bcd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,6 @@
 /target
 **/*.rs.bk
 .idea/
+
+perf*
+flame*
diff --git a/Cargo.toml b/Cargo.toml
index 6572266..a2fd139 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -35,3 +35,5 @@ version = "1"
 default-features = false
 features = ["run-for-all", "prepush-hook", "run-cargo-check", "run-cargo-test", "run-cargo-clippy", "run-cargo-fmt"]
 
+[profile.release]
+debug = 1
diff --git a/scripts/rust-unmangle b/scripts/rust-unmangle
new file mode 100755
index 0000000..96272a6
--- /dev/null
+++ b/scripts/rust-unmangle
@@ -0,0 +1,32 @@
+#!/usr/bin/env -S sed -rf
+# Unmangle Rust symbols
+# See https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/commit/?id=cae15db74999edb96dd9f5bbd4d55849391dd92b
+# Example, with [FlameGraph](https://github.com/brendangregg/FlameGraph):
+#     perf record -g target/debug/bin
+#     perf script | stackcollapse-perf | rust-unmangle | flamegraph > perf.svg
+
+# Remove hash and address offset
+s/::h[0-9a-f]{16}//g
+s/\+0x[0-9a-f]+//g
+
+# Convert special characters
+s/\$C\$/,/g
+s/\$SP\$/@/g
+s/\$BP\$/*/g
+s/\$RF\$/\&/g
+s/\$LT\$/</g
+s/\$GT\$/>/g
+s/\$LP\$/(/g
+s/\$RP\$/)/g
+s/\$u20\$/ /g
+s/\$u27\$/'/g
+s/\$u5b\$/[/g
+s/\$u5d\$/]/g
+s/\$u7b\$/{/g
+s/\$u7d\$/}/g
+s/\$u7e\$/~/g
+
+# Fix . and _
+s/\.\./::/g
+s/[^\.]\.[^\.]/./g
+s/([;:])_/\1/g
diff --git a/shell.nix b/shell.nix
index fe04ba8..a39f05d 100644
--- a/shell.nix
+++ b/shell.nix
@@ -8,6 +8,7 @@ in
     name = "bakare_shell";
     buildInputs = [
       channel.rust
+      linuxPackages.perf flamegraph cargo-flamegraph geeqie
       cacert openssl openssh zlib
       pkgconfig clang llvm
       git