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Upstream has released updates that appear to apply and compile correctly. This update has not been tested by PaperMC and as with ANY update, please do your own testing Bukkit Changes: 1fc1020a PR-1049: Add MenuType API 8ae2e3be PR-1055: Expand riptiding API cac68bfb SPIGOT-7890: AttributeModifier#getUniqueId() doesn't match the UUID passed to its constructor 7004fcf2 SPIGOT-7886: Fix mistake in AttributeModifier UUID shim 1ac7f950 PR-1054: Add FireworkMeta#hasPower 4cfb565f SPIGOT-7873: Add powered state for skulls CraftBukkit Changes: bbb30e7a8 SPIGOT-7894: NPE when sending tile entity update ba21e9472 SPIGOT-7895: PlayerItemBreakEvent not firing 0fb24bbe0 SPIGOT-7875: Fix PlayerItemConsumeEvent cancellation causing client-side desync 815066449 SPIGOT-7891: Can't remove second ingredient of MerchantRecipe 45c206f2c PR-1458: Add MenuType API 19c8ef9ae SPIGOT-7867: Merchant instanceof AbstractVillager always returns false 4e006d28f PR-1468: Expand riptiding API bd8aded7d Ignore checks in CraftPlayerProfile for ResolvableProfile used in profile components 8679620b5 SPIGOT-7889: Fix tool component deserialisation without speed and/or correct-for-drops 8d5222691 SPIGOT-7882, PR-1467: Fix conversion of name in Profile Component to empty if it is missing 63f91669a SPIGOT-7887: Remove duplicate ProjectileHitEvent for fireballs 7070de8c8 SPIGOT-7878: Server#getLootTable does not return null on invalid loot table 060ee6cae SPIGOT-7876: Can't kick player or disconnect player in PlayerLoginEvent when checking for cookies 7ccb86cc0 PR-1465: Add FireworkMeta#hasPower 804ad6491 SPIGOT-7873: Add powered state for skulls f9610cdcb Improve minecart movement Spigot Changes: a759b629 Rebuild patches Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>
57 lines
3.3 KiB
Diff
57 lines
3.3 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: stonar96 <minecraft.stonar96@gmail.com>
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Date: Sun, 17 Jan 2021 01:11:36 +0100
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Subject: [PATCH] Optimize HashMapPalette
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HashMapPalette uses an instance of CrudeIncrementalIntIdentityHashBiMap
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internally. A Palette has a preset maximum size = 1 << bits.
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CrudeIncrementalIntIdentityHashBiMap has an initial size but is
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automatically resized. The CrudeIncrementalIntIdentityHashBiMap is created
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with the maximum size in the constructor of HashMapPalette, with the aim
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that it doesn't need to be resized anymore. However, there are two things
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that I think Mojang hasn't considered here:
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1) The CrudeIncrementalIntIdentityHashBiMap is resized, when its initial
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size is reached and not the next time, when a further object is added.
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2) HashMapPalette adds objects (unnecessarily) before checking if the
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initial size of CrudeIncrementalIntIdentityHashBiMap is reached.
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This means to actually avoid resize operations in
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CrudeIncrementalIntIdentityHashBiMap, one has to add 2 to the initial size
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or add 1 and check the size before adding objects. This commit implements
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the second approach. Note that this isn't only an optimization but also
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makes async reads of Palettes fail-safe. An async read while the
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CrudeIncrementalIntIdentityHashBiMap is resized is fatal and can even lead
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to corrupted data. This is also something that Anti-Xray is currently
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relying on.
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diff --git a/src/main/java/net/minecraft/world/level/chunk/HashMapPalette.java b/src/main/java/net/minecraft/world/level/chunk/HashMapPalette.java
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index f80cde264393f3606bc0c54ba2fd6a467f4bcb5a..c5e1040c239874dcf20b79472bf690ee7f0a9e5f 100644
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--- a/src/main/java/net/minecraft/world/level/chunk/HashMapPalette.java
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+++ b/src/main/java/net/minecraft/world/level/chunk/HashMapPalette.java
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@@ -20,7 +20,7 @@ public class HashMapPalette<T> implements Palette<T> {
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}
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public HashMapPalette(IdMap<T> idList, int indexBits, PaletteResize<T> listener) {
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- this(idList, indexBits, listener, CrudeIncrementalIntIdentityHashBiMap.create(1 << indexBits));
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+ this(idList, indexBits, listener, CrudeIncrementalIntIdentityHashBiMap.create((1 << indexBits) + 1)); // Paper - Perf: Avoid unnecessary resize operation in CrudeIncrementalIntIdentityHashBiMap
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}
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private HashMapPalette(IdMap<T> idList, int indexBits, PaletteResize<T> listener, CrudeIncrementalIntIdentityHashBiMap<T> map) {
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@@ -38,10 +38,16 @@ public class HashMapPalette<T> implements Palette<T> {
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public int idFor(T object) {
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int i = this.values.getId(object);
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if (i == -1) {
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- i = this.values.add(object);
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- if (i >= 1 << this.bits) {
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+ // Paper start - Perf: Avoid unnecessary resize operation in CrudeIncrementalIntIdentityHashBiMap and optimize
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+ // We use size() instead of the result from add(K)
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+ // This avoids adding another object unnecessarily
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+ // Without this change, + 2 would be required in the constructor
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+ if (this.values.size() >= 1 << this.bits) {
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i = this.resizeHandler.onResize(this.bits + 1, object);
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+ } else {
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+ i = this.values.add(object);
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}
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+ // Paper end - Perf: Avoid unnecessary resize operation in CrudeIncrementalIntIdentityHashBiMap and optimize
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}
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return i;
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