From 27ec5ed9b16b5fa6fa759d63eb8daea15f037639 Mon Sep 17 00:00:00 2001
From: Futago-za Ryuu <futagoza.ryuu@gmail.com>
Date: Tue, 16 Jan 2018 02:57:12 +0000
Subject: [PATCH] Ensure we are nearly always in fast mode on V8

See: https://stackoverflow.com/a/24989927/1518408
---
 lib/compiler/visitor.js |  3 ++-
 lib/util/objects.js     | 21 +++++++++++++++++++++
 src/parser.pegjs        |  2 +-
 3 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/lib/compiler/visitor.js b/lib/compiler/visitor.js
index 44d5214..af44280 100644
--- a/lib/compiler/visitor.js
+++ b/lib/compiler/visitor.js
@@ -18,8 +18,9 @@ class ASTVisitor {
     // Simple AST node visitor builder for PEG.js
     static build( functions ) {
 
-        const visitor = new ASTVisitor();
+        let visitor = new ASTVisitor();
         util.extend( visitor, functions );
+        visitor = util.enforceFastProperties( visitor );
         return visitor.visit.bind( visitor );
 
     }
diff --git a/lib/util/objects.js b/lib/util/objects.js
index 0cf8339..eddd5f1 100644
--- a/lib/util/objects.js
+++ b/lib/util/objects.js
@@ -109,6 +109,27 @@ const objects = {
 
     },
 
+    // Will ensure on V8 that that property access is always in fast mode
+    // See: https://stackoverflow.com/a/24989927/1518408
+    enforceFastProperties( o ) {
+
+        /* eslint no-unreachable: 0 */
+
+        function Sub() { }
+        Sub.prototype = o;
+        const receiver = new Sub();
+        function ic() {
+
+            return typeof receiver.foo;
+
+        }
+        ic();
+        ic();
+        return o;
+        eval( "o" + o );
+
+    },
+
 };
 
 module.exports = objects;
diff --git a/src/parser.pegjs b/src/parser.pegjs
index 3d9957c..895ae7b 100644
--- a/src/parser.pegjs
+++ b/src/parser.pegjs
@@ -93,7 +93,7 @@
   function createNode( type, details ) {
     const node = new ast.Node( type, location() );
     util.extend( node, details );
-    return node;
+    return util.enforceFastProperties( node );
   }
 }