Split out compiler snapshot (#1566)

Speeds up startup time, reduces runtime heap size.

3 files changed, 21 insertions, 1 deletions

diff --git a/src/js_errors.rs b/src/js_errors.rs
index ea94f7c0a..73116d679 100644
--- a/src/js_errors.rs
+++ b/src/js_errors.rs
@@ -355,6 +355,14 @@ fn parse_map_string(
         include_str!(concat!(env!("GN_OUT_DIR"), "/gen/bundle/main.js.map"));
       SourceMap::from_json(s)
     }
+    #[cfg(not(feature = "check-only"))]
+    "gen/bundle/compiler.js" => {
+      let s = include_str!(concat!(
+        env!("GN_OUT_DIR"),
+        "/gen/bundle/compiler.js.map"
+      ));
+      SourceMap::from_json(s)
+    }
     _ => match getter.get_source_map(script_name) {
       None => None,
       Some(raw_source_map) => SourceMap::from_json(&raw_source_map),
diff --git a/src/snapshot.rs b/src/snapshot.rs
index 16a186c29..ac1648e0c 100644
--- a/src/snapshot.rs
+++ b/src/snapshot.rs
@@ -12,3 +12,15 @@ pub fn deno_snapshot() -> deno_buf {
 
   unsafe { deno_buf::from_raw_parts(data.as_ptr(), data.len()) }
 }
+
+pub fn compiler_snapshot() -> deno_buf {
+  #[cfg(not(feature = "check-only"))]
+  let data =
+    include_bytes!(concat!(env!("GN_OUT_DIR"), "/gen/snapshot_compiler.bin"));
+  // The snapshot blob is not available when the Rust Language Server runs
+  // 'cargo check'.
+  #[cfg(feature = "check-only")]
+  let data = vec![];
+
+  unsafe { deno_buf::from_raw_parts(data.as_ptr(), data.len()) }
+}
diff --git a/src/workers.rs b/src/workers.rs
index 279cc3cc9..5eb75ae13 100644
--- a/src/workers.rs
+++ b/src/workers.rs
@@ -34,7 +34,7 @@ impl Worker {
       Some(internal_channels),
     ));
 
-    let snapshot = snapshot::deno_snapshot();
+    let snapshot = snapshot::compiler_snapshot();
     let isolate = Isolate::new(snapshot, state, ops::dispatch);
 
     let worker = Worker { isolate };