From 3a9650d0fca0bbdda24ddc5c9ad093c676e5215b Mon Sep 17 00:00:00 2001
From: Denis Zharkov <denis.zharkov@jetbrains.com>
Date: Thu, 5 Oct 2017 19:07:30 +0300
Subject: [PATCH] Introduce cache for KotlinBuiltins::builtInClassesByName

There are a lot of places requesting nothing/any/.. instances
and just asking the scopes isn't very effecient:
see org.jetbrains.kotlin.builtins.KotlinBuiltIns#createPackage
having ChainedMemberScope and a `map` call
---
 .../org/jetbrains/kotlin/builtins/KotlinBuiltIns.java  | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/core/descriptors/src/org/jetbrains/kotlin/builtins/KotlinBuiltIns.java b/core/descriptors/src/org/jetbrains/kotlin/builtins/KotlinBuiltIns.java
index 6e40c4674f3..dc4f99d4bab 100644
--- a/core/descriptors/src/org/jetbrains/kotlin/builtins/KotlinBuiltIns.java
+++ b/core/descriptors/src/org/jetbrains/kotlin/builtins/KotlinBuiltIns.java
@@ -79,6 +79,7 @@ public abstract class KotlinBuiltIns {
     private final NotNullLazyValue<PackageFragments> packageFragments;
 
     private final MemoizedFunctionToNotNull<Integer, ClassDescriptor> suspendFunctionClasses;
+    private final MemoizedFunctionToNotNull<Name, ClassDescriptor> builtInClassesByName;
 
     private final StorageManager storageManager;
 
@@ -135,6 +136,13 @@ public abstract class KotlinBuiltIns {
                 );
             }
         });
+
+        this.builtInClassesByName = storageManager.createMemoizedFunction(new Function1<Name, ClassDescriptor>() {
+            @Override
+            public ClassDescriptor invoke(Name name) {
+                return getBuiltInClassByName(name, getBuiltInsPackageFragment());
+            }
+        });
     }
 
     protected void createBuiltInsModule() {
@@ -415,7 +423,7 @@ public abstract class KotlinBuiltIns {
 
     @NotNull
     public ClassDescriptor getBuiltInClassByName(@NotNull Name simpleName) {
-        return getBuiltInClassByName(simpleName, getBuiltInsPackageFragment());
+        return builtInClassesByName.invoke(simpleName);
     }
 
     @NotNull