From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: violetc <58360096+s-yh-china@users.noreply.github.com>
Date: Wed, 17 Aug 2022 10:48:18 +0800
Subject: [PATCH] Reduce entity allocations

This patch is Powered by Pufferfish(https://github.com/pufferfish-gg/Pufferfish)

diff --git a/src/main/java/net/minecraft/world/entity/ai/attributes/AttributeMap.java b/src/main/java/net/minecraft/world/entity/ai/attributes/AttributeMap.java
index 69992ebc999ea3ff9e47e4e049bcc514c01150ca..2118ad41e94e8f5e5fac50286ceb24ab70db88f2 100644
--- a/src/main/java/net/minecraft/world/entity/ai/attributes/AttributeMap.java
+++ b/src/main/java/net/minecraft/world/entity/ai/attributes/AttributeMap.java
@@ -23,9 +23,11 @@ public class AttributeMap {
     private final Set<AttributeInstance> attributesToSync = new ObjectOpenHashSet<>();
     private final Set<AttributeInstance> attributesToUpdate = new ObjectOpenHashSet<>();
     private final AttributeSupplier supplier;
+    private final java.util.function.Function<Holder<Attribute>, AttributeInstance> createInstance; // Leaves - reduce entity allocations
 
     public AttributeMap(AttributeSupplier defaultAttributes) {
         this.supplier = defaultAttributes;
+        this.createInstance = attribute -> this.supplier.createInstance(this::onAttributeModified, attribute);
     }
 
     private void onAttributeModified(AttributeInstance instance) {
@@ -49,7 +51,13 @@ public class AttributeMap {
 
     @Nullable
     public AttributeInstance getInstance(Holder<Attribute> attribute) {
-        return this.attributes.computeIfAbsent(attribute, attributex -> this.supplier.createInstance(this::onAttributeModified, attributex));
+        // Leaves start - cache lambda, as for some reason java allocates it anyways
+        if (org.leavesmc.leaves.LeavesConfig.reduceEntityAllocations) {
+            return this.attributes.computeIfAbsent(attribute, this.createInstance);
+        } else {
+            return this.attributes.computeIfAbsent(attribute, attributex -> this.supplier.createInstance(this::onAttributeModified, attributex));
+        }
+        // Leaves end - cache lambda, as for some reason java allocates it anyways
     }
 
     public boolean hasAttribute(Holder<Attribute> attribute) {