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papermc/Spigot-Server-Patches/0080-Optimize-isValidLocation-getType-and-getBlockData-fo.patch
Aikar 9dc4d6448b
Numerous fixes to entity related changes 
While it wasn't really "broken" before, if plugins use NMS
(which they really should't be) and mess with entity management
themselves, and get it wrong, they could ultimately corrupt our
state expectations.

I've been unable to reproduce any issues locally, but these changes
are the result of me analyzing the code pretty deeply and seeing
about how to make it more durable to abnormal usage.

Any servers seeing oddities, please run with -Ddebug.entities=true
and send me any logs triggered.
2019-04-05 23:08:45 -04:00

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From e97a654e918381c5b2eb07cf6d632fb55c457fa6 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Thu, 3 Mar 2016 02:07:55 -0600
Subject: [PATCH] Optimize isValidLocation, getType and getBlockData for inling
Hot methods, so reduce # of instructions for the method.
Move is valid location test to the BlockPosition class so that it can access local variables.
Replace all calls to the new place to the unnecessary forward.
Optimize getType and getBlockData to manually inline and optimize the calls
diff --git a/src/main/java/net/minecraft/server/BaseBlockPosition.java b/src/main/java/net/minecraft/server/BaseBlockPosition.java
index 5843ef65af..4c7793f86d 100644
--- a/src/main/java/net/minecraft/server/BaseBlockPosition.java
+++ b/src/main/java/net/minecraft/server/BaseBlockPosition.java
@@ -10,6 +10,14 @@ public class BaseBlockPosition implements Comparable<BaseBlockPosition> {
private final int a;
private final int b;
private final int c;
+ // Paper start
+ public boolean isValidLocation() {
+ return a >= -30000000 && c >= -30000000 && a < 30000000 && c < 30000000 && b >= 0 && b < 256;
+ }
+ public boolean isInvalidYLocation() {
+ return b < 0 || b >= 256;
+ }
+ // Paper end
public BaseBlockPosition(int i, int j, int k) {
this.a = i;
diff --git a/src/main/java/net/minecraft/server/BlockPosition.java b/src/main/java/net/minecraft/server/BlockPosition.java
index 9bb7c9c652..bc364ce371 100644
--- a/src/main/java/net/minecraft/server/BlockPosition.java
+++ b/src/main/java/net/minecraft/server/BlockPosition.java
@@ -300,6 +300,16 @@ public class BlockPosition extends BaseBlockPosition {
protected int b;
protected int c;
protected int d;
+ // Paper start
+ @Override
+ public boolean isValidLocation() {
+ return b >= -30000000 && d >= -30000000 && b < 30000000 && d < 30000000 && c >= 0 && c < 256;
+ }
+ @Override
+ public boolean isInvalidYLocation() {
+ return c < 0 || c >= 256;
+ }
+ // Paper end
public MutableBlockPosition() {
this(0, 0, 0);
diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
index 3f9de7e55a..b76c1579ea 100644
--- a/src/main/java/net/minecraft/server/Chunk.java
+++ b/src/main/java/net/minecraft/server/Chunk.java
@@ -425,12 +425,24 @@ public class Chunk implements IChunkAccess {
return this.getBlockData(i, j, k).b(this.world, new BlockPosition(i, j, k));
}
- public IBlockData getBlockData(BlockPosition blockposition) { return getType(blockposition); } // Paper
- public IBlockData getType(BlockPosition blockposition) {
+ // Paper start - Optimize getBlockData to reduce instructions
+ public final IBlockData getBlockData(BlockPosition pos) { return getBlockData(pos.getX(), pos.getY(), pos.getZ()); } // Paper
+ public final IBlockData getType(BlockPosition blockposition) {
return this.getBlockData(blockposition.getX(), blockposition.getY(), blockposition.getZ());
}
- public IBlockData getBlockData(int i, int j, int k) {
+ public final IBlockData getBlockData(final int x, final int y, final int z) {
+ // Method body / logic copied from below
+ final int i = y >> 4;
+ if (y >= 0 && i < this.sections.length && this.sections[i] != null) {
+ // Inlined ChunkSection.getType() and DataPaletteBlock.a(int,int,int)
+ return this.sections[i].blockIds.a((y & 15) << 8 | (z & 15) << 4 | x & 15);
+ }
+ return Blocks.AIR.getBlockData();
+ }
+
+ public IBlockData getBlockData_unused(int i, int j, int k) {
+ // Paper end
if (this.world.S() == WorldType.DEBUG_ALL_BLOCK_STATES) {
IBlockData iblockdata = null;
diff --git a/src/main/java/net/minecraft/server/ChunkSection.java b/src/main/java/net/minecraft/server/ChunkSection.java
index 3c5f10ad4d..621ed1fc53 100644
--- a/src/main/java/net/minecraft/server/ChunkSection.java
+++ b/src/main/java/net/minecraft/server/ChunkSection.java
@@ -7,7 +7,7 @@ public class ChunkSection {
private int nonEmptyBlockCount;
private int tickingBlockCount;
private int e;
- private final DataPaletteBlock<IBlockData> blockIds;
+ final DataPaletteBlock<IBlockData> blockIds; // Paper - package
private NibbleArray emittedLight;
private NibbleArray skyLight;
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index fd45090685..f4e91db7c6 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -257,11 +257,11 @@ public abstract class World implements IEntityAccess, GeneratorAccess, IIBlockAc
}
public static boolean isValidLocation(BlockPosition blockposition) {
- return !k(blockposition) && blockposition.getX() >= -30000000 && blockposition.getZ() >= -30000000 && blockposition.getX() < 30000000 && blockposition.getZ() < 30000000;
+ return blockposition.isValidLocation(); // Paper
}
public static boolean k(BlockPosition blockposition) {
- return blockposition.getY() < 0 || blockposition.getY() >= 256;
+ return blockposition.isInvalidYLocation(); // Paper
}
public boolean isEmpty(BlockPosition blockposition) {
@@ -278,7 +278,7 @@ public abstract class World implements IEntityAccess, GeneratorAccess, IIBlockAc
// test if meets light level, return faster
// logic copied from below
public boolean isLightLevel(BlockPosition blockposition, int level) {
- if (isValidLocation(blockposition)) {
+ if (blockposition.isValidLocation()) {
if (this.getType(blockposition).c(this, blockposition)) {
int sky = getSkylightSubtracted();
if (this.getLightLevel(blockposition.up(), sky) >= level) {
@@ -325,7 +325,7 @@ public abstract class World implements IEntityAccess, GeneratorAccess, IIBlockAc
// CraftBukkit end
Chunk chunk = this.getChunkIfLoaded(blockposition);
if (chunk != null) {
- return isValidLocation(blockposition) ? chunk.getBlockData(blockposition) : Blocks.AIR.getBlockData();
+ return blockposition.isValidLocation() ? chunk.getBlockData(blockposition) : Blocks.AIR.getBlockData(); // Paper
}
return null;
}
@@ -380,7 +380,7 @@ public abstract class World implements IEntityAccess, GeneratorAccess, IIBlockAc
return true;
}
// CraftBukkit end
- if (k(blockposition)) {
+ if (blockposition.isInvalidYLocation()) { // Paper
return false;
} else if (!this.isClientSide && this.worldData.getType() == WorldType.DEBUG_ALL_BLOCK_STATES) {
return false;
@@ -707,11 +707,11 @@ public abstract class World implements IEntityAccess, GeneratorAccess, IIBlockAc
blockposition = new BlockPosition(blockposition.getX(), 0, blockposition.getZ());
}
- return !isValidLocation(blockposition) ? enumskyblock.c : (!this.isLoaded(blockposition) ? enumskyblock.c : this.getChunkAtWorldCoords(blockposition).getBrightness(enumskyblock, blockposition));
+ return !blockposition.isValidLocation() ? enumskyblock.c : (!this.isLoaded(blockposition) ? enumskyblock.c : this.getChunkAtWorldCoords(blockposition).getBrightness(enumskyblock, blockposition)); // Paper
}
public void a(EnumSkyBlock enumskyblock, BlockPosition blockposition, int i) {
- if (isValidLocation(blockposition)) {
+ if (blockposition.isValidLocation()) { // Paper
if (this.isLoaded(blockposition)) {
this.getChunkAtWorldCoords(blockposition).a(enumskyblock, blockposition, i);
this.m(blockposition);
@@ -738,7 +738,7 @@ public abstract class World implements IEntityAccess, GeneratorAccess, IIBlockAc
}
}
// CraftBukkit end
- if (k(blockposition)) {
+ if (blockposition.isInvalidYLocation()) { // Paper
return Blocks.VOID_AIR.getBlockData();
} else {
Chunk chunk = this.getChunkAtWorldCoords(blockposition);
@@ -748,7 +748,7 @@ public abstract class World implements IEntityAccess, GeneratorAccess, IIBlockAc
}
public Fluid getFluid(BlockPosition blockposition) {
- if (k(blockposition)) {
+ if (blockposition.isInvalidYLocation()) { // Paper
return FluidTypes.EMPTY.i();
} else {
Chunk chunk = this.getChunkAtWorldCoords(blockposition);
@@ -1767,7 +1767,7 @@ public abstract class World implements IEntityAccess, GeneratorAccess, IIBlockAc
public Map<BlockPosition, TileEntity> capturedTileEntities = Maps.newHashMap();
@Nullable
public TileEntity getTileEntity(BlockPosition blockposition) {
- if (k(blockposition)) {
+ if (blockposition.isInvalidYLocation()) { // Paper
return null;
} else {
// CraftBukkit start
@@ -1808,7 +1808,7 @@ public abstract class World implements IEntityAccess, GeneratorAccess, IIBlockAc
}
public void setTileEntity(BlockPosition blockposition, @Nullable TileEntity tileentity) {
- if (!k(blockposition)) {
+ if (!blockposition.isInvalidYLocation()) { // Paper
if (tileentity != null && !tileentity.x()) {
// CraftBukkit start
if (captureBlockStates) {
@@ -1869,7 +1869,7 @@ public abstract class World implements IEntityAccess, GeneratorAccess, IIBlockAc
}
public boolean p(BlockPosition blockposition) {
- if (k(blockposition)) {
+ if (blockposition.isInvalidYLocation()) { // Paper
return false;
} else {
Chunk chunk = this.chunkProvider.getChunkAt(blockposition.getX() >> 4, blockposition.getZ() >> 4, false, false);
--
2.21.0
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