From d12b039e1ad601622c6135e13f00fd14cb09bce1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bartek=20Iwa=C5=84czuk?= <biwanczuk@gmail.com>
Date: Tue, 7 Mar 2023 08:57:58 -0400
Subject: perf: disable snapshot compression (#18061)

This commit disables snapshot compression for the CLI snapshot.]

Decompressing the snapshot on startup takes ~2.5ms.
---
 cli/js.rs | 31 +++----------------------------
 1 file changed, 3 insertions(+), 28 deletions(-)

(limited to 'cli/js.rs')

diff --git a/cli/js.rs b/cli/js.rs
index 06a6a5fd9..f3c4fea68 100644
--- a/cli/js.rs
+++ b/cli/js.rs
@@ -1,37 +1,12 @@
 // Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
 
 use deno_core::Snapshot;
-use log::debug;
-use once_cell::sync::Lazy;
 
-pub static CLI_SNAPSHOT: Lazy<Box<[u8]>> = Lazy::new(
-  #[allow(clippy::uninit_vec)]
-  #[cold]
-  #[inline(never)]
-  || {
-    static COMPRESSED_CLI_SNAPSHOT: &[u8] =
-      include_bytes!(concat!(env!("OUT_DIR"), "/CLI_SNAPSHOT.bin"));
-
-    let size =
-      u32::from_le_bytes(COMPRESSED_CLI_SNAPSHOT[0..4].try_into().unwrap())
-        as usize;
-    let mut vec = Vec::with_capacity(size);
-
-    // SAFETY: vec is allocated with exact snapshot size (+ alignment)
-    // SAFETY: non zeroed bytes are overwritten with decompressed snapshot
-    unsafe {
-      vec.set_len(size);
-    }
-
-    lzzzz::lz4::decompress(&COMPRESSED_CLI_SNAPSHOT[4..], &mut vec).unwrap();
-
-    vec.into_boxed_slice()
-  },
-);
+static CLI_SNAPSHOT: &[u8] =
+  include_bytes!(concat!(env!("OUT_DIR"), "/CLI_SNAPSHOT.bin"));
 
 pub fn deno_isolate_init() -> Snapshot {
-  debug!("Deno isolate init with snapshots.");
-  Snapshot::Static(&CLI_SNAPSHOT)
+  Snapshot::Static(CLI_SNAPSHOT)
 }
 
 #[cfg(test)]
-- 
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