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c5a10665b8
Spigot still maintains some partial implementation of "tick skipping", a practice in which the MinecraftServer.currentTick field is updated not by an increment of one per actual tick, but instead set to System.currentTimeMillis() / 50. This behaviour means that the tracked tick may "skip" a tick value in case a previous tick took more than the expected 50ms. To compensate for this in important paths, spigot/craftbukkit implements "wall-time". Instead of incrementing/decrementing ticks on block entities/entities by one for each call to their tick() method, they instead increment/decrement important values, like an ItemEntity's age or pickupDelay, by the difference of `currentTick - lastTick`, where `lastTick` is the value of `currentTick` during the last tick() call. These "fixes" however do not play nicely with minecraft's simulation distance as entities/block entities implementing the above behaviour would "catch up" their values when moving from a non-ticking chunk to a ticking one as their `lastTick` value remains stuck on the last tick in a ticking chunk and hence lead to a large "catch up" once ticked again. Paper completely removes the "tick skipping" behaviour (See patch "Further-improve-server-tick-loop"), making the above precautions completely unnecessary, which also rids paper of the previous described incompatibility with non-ticking chunks.
117 lines
8 KiB
Diff
117 lines
8 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Jake Potrebic <jake.m.potrebic@gmail.com>
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Date: Sat, 29 Oct 2022 17:02:42 -0700
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Subject: [PATCH] Fix possible StackOverflowError for some dispenses
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For saddles, carpets, horse armor, and chests for horse-likes
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a BlockDispenseEvent handler that always mutated the item without
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changing the type would result in a SO error because when it went
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to find the replacement dispense behavior (since the item "changed")
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it didn't properly handle if the replacement was the same instance
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of dispense behavior.
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Additionally equippable mob heads, wither skulls, and carved pumpkins
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are subject to the same possible error.
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diff --git a/src/main/java/net/minecraft/core/dispenser/DispenseItemBehavior.java b/src/main/java/net/minecraft/core/dispenser/DispenseItemBehavior.java
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index 7826e2a52da47914aca39fef958b8f398a2ff937..0c0b8a49b3342cd015381c6a93fab23c32cd32e6 100644
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--- a/src/main/java/net/minecraft/core/dispenser/DispenseItemBehavior.java
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+++ b/src/main/java/net/minecraft/core/dispenser/DispenseItemBehavior.java
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@@ -239,7 +239,7 @@ public interface DispenseItemBehavior {
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// Chain to handler for new item
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ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
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DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
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- if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != ArmorItem.DISPENSE_ITEM_BEHAVIOR) {
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+ if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != this) { // Paper - fix possible StackOverflowError
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idispensebehavior.dispense(pointer, eventStack);
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return stack;
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}
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@@ -295,7 +295,7 @@ public interface DispenseItemBehavior {
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// Chain to handler for new item
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ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
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DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
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- if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != ArmorItem.DISPENSE_ITEM_BEHAVIOR) {
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+ if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != this) { // Paper - fix possible StackOverflowError
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idispensebehavior.dispense(pointer, eventStack);
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return stack;
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}
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@@ -369,7 +369,7 @@ public interface DispenseItemBehavior {
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// Chain to handler for new item
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ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
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DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
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- if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != ArmorItem.DISPENSE_ITEM_BEHAVIOR) {
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+ if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != this) { // Paper - fix possible StackOverflowError
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idispensebehavior.dispense(pointer, eventStack);
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return stack;
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}
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@@ -690,7 +690,7 @@ public interface DispenseItemBehavior {
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OptionalDispenseItemBehavior dispensebehaviormaybe1 = new OptionalDispenseItemBehavior() {
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@Override
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protected ItemStack execute(BlockSource pointer, ItemStack stack) {
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- this.setSuccess(ArmorItem.dispenseArmor(pointer, stack));
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+ this.setSuccess(ArmorItem.dispenseArmor(pointer, stack, this)); // Paper - fix possible StackOverflowError
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return stack;
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}
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};
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@@ -744,7 +744,7 @@ public interface DispenseItemBehavior {
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stack.shrink(1);
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this.setSuccess(true);
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} else {
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- this.setSuccess(ArmorItem.dispenseArmor(pointer, stack));
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+ this.setSuccess(ArmorItem.dispenseArmor(pointer, stack, this)); // Paper - fix possible StackOverflowError
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}
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return stack;
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@@ -790,7 +790,7 @@ public interface DispenseItemBehavior {
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stack.shrink(1);
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this.setSuccess(true);
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} else {
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- this.setSuccess(ArmorItem.dispenseArmor(pointer, stack));
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+ this.setSuccess(ArmorItem.dispenseArmor(pointer, stack, this)); // Paper - fix possible StackOverflowError
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}
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return stack;
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@@ -918,7 +918,7 @@ public interface DispenseItemBehavior {
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// Chain to handler for new item
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ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
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DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
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- if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != ArmorItem.DISPENSE_ITEM_BEHAVIOR) {
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+ if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != this) { // Paper - fix possible StackOverflowError
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idispensebehavior.dispense(pointer, eventStack);
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return stack;
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}
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diff --git a/src/main/java/net/minecraft/world/item/ArmorItem.java b/src/main/java/net/minecraft/world/item/ArmorItem.java
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index fb518f87cc4ccd810fb32cade2fdd7e09ab0abfc..647a4601deace52f8d855f512a73671f82b4762a 100644
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--- a/src/main/java/net/minecraft/world/item/ArmorItem.java
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+++ b/src/main/java/net/minecraft/world/item/ArmorItem.java
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@@ -39,14 +39,20 @@ public class ArmorItem extends Item implements Equipable {
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public static final DispenseItemBehavior DISPENSE_ITEM_BEHAVIOR = new DefaultDispenseItemBehavior() {
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@Override
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protected ItemStack execute(BlockSource pointer, ItemStack stack) {
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- return ArmorItem.dispenseArmor(pointer, stack) ? stack : super.execute(pointer, stack);
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+ return ArmorItem.dispenseArmor(pointer, stack, this) ? stack : super.execute(pointer, stack); // Paper - fix possible StackOverflowError
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}
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};
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protected final ArmorItem.Type type;
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protected final Holder<ArmorMaterial> material;
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private final Supplier<ItemAttributeModifiers> defaultModifiers;
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+ @Deprecated @io.papermc.paper.annotation.DoNotUse // Paper
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public static boolean dispenseArmor(BlockSource pointer, ItemStack armor) {
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+ // Paper start
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+ return dispenseArmor(pointer, armor, null);
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+ }
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+ public static boolean dispenseArmor(BlockSource pointer, ItemStack armor, @javax.annotation.Nullable DispenseItemBehavior currentBehavior) {
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+ // Paper end
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BlockPos blockposition = pointer.pos().relative((Direction) pointer.state().getValue(DispenserBlock.FACING));
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List<LivingEntity> list = pointer.level().getEntitiesOfClass(LivingEntity.class, new AABB(blockposition), EntitySelector.NO_SPECTATORS.and(new EntitySelector.MobCanWearArmorEntitySelector(armor)));
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@@ -77,7 +83,7 @@ public class ArmorItem extends Item implements Equipable {
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// Chain to handler for new item
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ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
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DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
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- if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != ArmorItem.DISPENSE_ITEM_BEHAVIOR) {
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+ if (idispensebehavior != DispenseItemBehavior.NOOP && (currentBehavior == null || idispensebehavior != currentBehavior)) { // Paper - fix possible StackOverflowError
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idispensebehavior.dispense(pointer, eventStack);
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return true;
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}
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