com.github.fierioziy.asm.ServerConnectionASM Maven / Gradle / Ivy
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package com.github.fierioziy.asm;
import com.github.fierioziy.api.PlayerConnection;
import com.github.fierioziy.api.ServerConnection;
import org.objectweb.asm.*;
/**
* Class responsible for providing bytecode of ServerConnection
* and PlayerConnection classes.
*/
public class ServerConnectionASM extends BaseASM {
/**
* A Type object representing ServerConnection class.
*/
private Type serverConnType = Type.getType(ServerConnection.class);
/**
* A Type object representing PlayerConnection class.
*/
private Type playerConnType = Type.getType(PlayerConnection.class);
/**
* A Type object representing implementation
* of ServerConnection class.
*/
private Type serverConnTypeImpl = getTypeImpl(serverConnType);
/**
* A Type object representing implementation
* of PlayerConnection class.
*/
private Type playerConnTypeImpl = getTypeImpl(playerConnType);
public ServerConnectionASM(String version) {
super(version);
}
/**
* Gets a Type object representing an implementation
* of class represented by parameter Type object.
*
* @param superType a Type object associated
* with base class.
* @return a Type object representing class
* extending or implementing parameter's class represented
* by Type object.
*/
private Type getTypeImpl(Type superType) {
return getTypeImpl(superType, "_Impl");
}
/**
* Creates a bytecode of class implementing ServerConnection
* interface.
*
* @return a {@code byte[]} array containing bytecode of class
* implementing ServerConnection interface.
* @see ServerConnection
*/
public byte[] createServerConnection() {
ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
cw.visit(V1_7, ACC_PUBLIC + ACC_SUPER,
serverConnTypeImpl.getInternalName(), null,
"java/lang/Object", new String[] { serverConnType.getInternalName() });
/*
Generates default constructor.
*/
{
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
"",
"()V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL,
"java/lang/Object",
"",
"()V", false);
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
/*
Generates method that instantiates PlayerConnection interface implementation.
*/
{
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
"createPlayerConnection",
"(Lorg/bukkit/entity/Player;)" + playerConnType.getDescriptor(), null, null);
mv.visitCode();
mv.visitTypeInsn(NEW, playerConnTypeImpl.getInternalName());
mv.visitInsn(DUP);
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKESPECIAL,
playerConnTypeImpl.getInternalName(),
"",
"(Lorg/bukkit/entity/Player;)V", false);
mv.visitInsn(ARETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
/*
Generates method that extracts NMS PlayerConnection from Player and
sends packet object (cast from Object to Packet is performed).
*/
{
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
"sendPacket",
"(Lorg/bukkit/entity/Player;Ljava/lang/Object;)V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 1);
mv.visitTypeInsn(CHECKCAST, OBC + "/entity/CraftPlayer");
mv.visitMethodInsn(INVOKEVIRTUAL,
OBC + "/entity/CraftPlayer",
"getHandle",
"()" + desc(NMS + "/EntityPlayer"), false);
mv.visitFieldInsn(GETFIELD,
NMS + "/EntityPlayer",
"playerConnection",
desc(NMS + "/PlayerConnection"));
mv.visitVarInsn(ALOAD, 2);
mv.visitTypeInsn(CHECKCAST, NMS + "/Packet");
mv.visitMethodInsn(INVOKEVIRTUAL,
NMS + "/PlayerConnection",
"sendPacket",
"(" + desc(NMS + "/Packet") + ")V", false);
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
/*
Generates method that extracts NMS PlayerConnection from each Player and
sends packet object (cast from Object to Packet is performed before loop).
*/
{
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
"sendPacket",
"(Ljava/util/Collection;Ljava/lang/Object;)V",
"(Ljava/util/Collection;Ljava/lang/Object;)V", null);
mv.visitCode();
// Packet nmsPacket = (Packet) packet;
mv.visitVarInsn(ALOAD, 2);
mv.visitTypeInsn(CHECKCAST, NMS + "/Packet");
mv.visitVarInsn(ASTORE, 3);
// int length = player.size();
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKEINTERFACE,
"java/util/Collection",
"size",
"()I", true);
mv.visitVarInsn(ISTORE, 4);
// Iterator it = players.iterator();
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKEINTERFACE,
"java/util/Collection",
"iterator",
"()Ljava/util/Iterator;", true);
mv.visitVarInsn(ASTORE, 5);
// for (int i = 0
mv.visitInsn(ICONST_0);
mv.visitVarInsn(ISTORE, 6);
Label loopBegin = new Label();
Label loopEnd = new Label();
// i < length
mv.visitLabel(loopBegin);
mv.visitVarInsn(ILOAD, 6);
mv.visitVarInsn(ILOAD, 4);
mv.visitJumpInsn(IF_ICMPGE, loopEnd);
// ((CraftPlayer) it.next()).getHandle()
mv.visitVarInsn(ALOAD, 5);
mv.visitMethodInsn(INVOKEINTERFACE,
"java/util/Iterator",
"next",
"()Ljava/lang/Object;", true);
mv.visitTypeInsn(CHECKCAST, OBC + "/entity/CraftPlayer");
mv.visitMethodInsn(INVOKEVIRTUAL,
OBC + "/entity/CraftPlayer",
"getHandle",
"()" + desc(NMS + "/EntityPlayer"), false);
// .playerConnection
mv.visitFieldInsn(GETFIELD,
NMS + "/EntityPlayer",
"playerConnection",
desc(NMS + "/PlayerConnection"));
// .sendPacket(nmsPacket);
mv.visitVarInsn(ALOAD, 3);
mv.visitMethodInsn(INVOKEVIRTUAL,
NMS + "/PlayerConnection",
"sendPacket",
"(" + desc(NMS + "/Packet") + ")V", false);
// ; ++i)
mv.visitIincInsn(6, 1);
mv.visitJumpInsn(GOTO, loopBegin);
mv.visitLabel(loopEnd);
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
/*
Generates method that iterates over players
from Location's world and checks, if player is within range.
A NMS PlayerConnection is then extracted and used
to send packet object (casted from Object to Packet before entering loop).
*/
{
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
"sendPacket",
"(Lorg/bukkit/Location;DLjava/lang/Object;)V", null, null);
mv.visitCode();
// radius *= radius;
mv.visitVarInsn(DLOAD, 2);
mv.visitVarInsn(DLOAD, 2);
mv.visitInsn(DMUL);
mv.visitVarInsn(DSTORE, 2);
// Packet nmsPacket = (Packet) packet;
mv.visitVarInsn(ALOAD, 4);
mv.visitTypeInsn(CHECKCAST, NMS + "/Packet");
mv.visitVarInsn(ASTORE, 5);
// double x = loc.getX();
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKEVIRTUAL,
"org/bukkit/Location",
"getX",
"()D", false);
mv.visitVarInsn(DSTORE, 6);
// double y = loc.getY();
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKEVIRTUAL,
"org/bukkit/Location",
"getY",
"()D", false);
mv.visitVarInsn(DSTORE, 8);
// double z = loc.getZ();
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKEVIRTUAL,
"org/bukkit/Location",
"getZ",
"()D", false);
mv.visitVarInsn(DSTORE, 10);
// 2x loc.getWorld().getPlayers()
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKEVIRTUAL,
"org/bukkit/Location",
"getWorld",
"()Lorg/bukkit/World;", false);
mv.visitMethodInsn(INVOKEINTERFACE,
"org/bukkit/World",
"getPlayers",
"()Ljava/util/List;", true);
mv.visitInsn(DUP);
// int length = players.size();
mv.visitMethodInsn(INVOKEINTERFACE,
"java/util/List",
"size",
"()I", true);
mv.visitVarInsn(ISTORE, 12);
// Iterator it = players.iterator();
mv.visitMethodInsn(INVOKEINTERFACE,
"java/util/List",
"iterator",
"()Ljava/util/Iterator;", true);
mv.visitVarInsn(ASTORE, 13);
// for (int i = 0
mv.visitInsn(ICONST_0);
mv.visitVarInsn(ISTORE, 14);
Label loopBegin = new Label();
Label loopEnd = new Label();
// i < length
mv.visitLabel(loopBegin);
mv.visitVarInsn(ILOAD, 14);
mv.visitVarInsn(ILOAD, 12);
mv.visitJumpInsn(IF_ICMPGE, loopEnd);
// CraftPlayer p = (CraftPlayer) it.next();
mv.visitVarInsn(ALOAD, 13);
mv.visitMethodInsn(INVOKEINTERFACE,
"java/util/Iterator",
"next",
"()Ljava/lang/Object;", true);
mv.visitTypeInsn(CHECKCAST, OBC + "/entity/CraftPlayer");
mv.visitVarInsn(ASTORE, 15);
// Location pLoc = p.getLocation();
mv.visitVarInsn(ALOAD, 15);
mv.visitMethodInsn(INVOKEVIRTUAL,
OBC + "/entity/CraftPlayer",
"getLocation",
"()Lorg/bukkit/Location;", false);
mv.visitVarInsn(ASTORE, 16);
// radius if statement
// (pLoc.getX() - x)^2
mv.visitVarInsn(ALOAD, 16);
mv.visitMethodInsn(INVOKEVIRTUAL,
"org/bukkit/Location",
"getX",
"()D", false);
mv.visitVarInsn(DLOAD, 6);
mv.visitInsn(DSUB);
mv.visitInsn(DUP2);
mv.visitInsn(DMUL);
// + (pLoc.getY() - y)^2
mv.visitVarInsn(ALOAD, 16);
mv.visitMethodInsn(INVOKEVIRTUAL,
"org/bukkit/Location",
"getY",
"()D", false);
mv.visitVarInsn(DLOAD, 8);
mv.visitInsn(DSUB);
mv.visitInsn(DUP2);
mv.visitInsn(DMUL);
mv.visitInsn(DADD);
// + (pLoc.getZ() - z)^2)
mv.visitVarInsn(ALOAD, 16);
mv.visitMethodInsn(INVOKEVIRTUAL,
"org/bukkit/Location",
"getZ",
"()D", false);
mv.visitVarInsn(DLOAD, 10);
mv.visitInsn(DSUB);
mv.visitInsn(DUP2);
mv.visitInsn(DMUL);
mv.visitInsn(DADD);
// if (distSquared <= radius) {
mv.visitVarInsn(DLOAD, 2);
Label notSendLabel = new Label();
mv.visitInsn(DCMPL);
mv.visitJumpInsn(IFGT, notSendLabel);
// p.getHandle().playerConnection
mv.visitVarInsn(ALOAD, 15);
mv.visitMethodInsn(INVOKEVIRTUAL,
OBC + "/entity/CraftPlayer",
"getHandle",
"()" + desc(NMS + "/EntityPlayer"), false);
mv.visitFieldInsn(GETFIELD,
NMS + "/EntityPlayer",
"playerConnection",
desc(NMS + "/PlayerConnection"));
// .sendPacket(packet);
mv.visitVarInsn(ALOAD, 5);
mv.visitMethodInsn(INVOKEVIRTUAL,
NMS + "/PlayerConnection",
"sendPacket",
"(" + desc(NMS + "/Packet") + ")V", false);
// }
mv.visitLabel(notSendLabel);
// ; ++i)
mv.visitIincInsn(14, 1);
mv.visitJumpInsn(GOTO, loopBegin);
mv.visitLabel(loopEnd);
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
cw.visitEnd();
return cw.toByteArray();
}
/**
* Creates a bytecode of class implementing PlayerConnection
* interface.
*
* @return a {@code byte[]} array containing bytecode of class
* implementing PlayerConnection interface.
* @see PlayerConnection
*/
public byte[] createPlayerConnection() {
ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
cw.visit(V1_7, ACC_PUBLIC + ACC_SUPER,
playerConnTypeImpl.getInternalName(), null,
"java/lang/Object", new String[] { playerConnType.getInternalName() });
{
FieldVisitor fv = cw.visitField(ACC_PRIVATE,
"playerConnection",
desc(NMS + "/PlayerConnection"),
null, null);
fv.visitEnd();
}
/*
Generates constructor that extracts NMS PlayerConnection from player object
and stores it in field.
*/
{
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
"",
"(" + desc("org/bukkit/entity/Player") + ")V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL,
"java/lang/Object",
"",
"()V", false);
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.visitTypeInsn(CHECKCAST, OBC + "/entity/CraftPlayer");
mv.visitMethodInsn(INVOKEVIRTUAL,
OBC + "/entity/CraftPlayer",
"getHandle",
"()" + desc(NMS + "/EntityPlayer"), false);
mv.visitFieldInsn(GETFIELD,
NMS + "/EntityPlayer",
"playerConnection",
desc(NMS + "/PlayerConnection"));
mv.visitFieldInsn(PUTFIELD,
playerConnTypeImpl.getInternalName(),
"playerConnection",
desc(NMS + "/PlayerConnection"));
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
/*
Method that casts provided object to Packet and send it
using NMS PlayerConnection from field.
*/
{
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "sendPacket", "(Ljava/lang/Object;)V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD,
playerConnTypeImpl.getInternalName(),
"playerConnection",
desc(NMS + "/PlayerConnection"));
mv.visitVarInsn(ALOAD, 1);
mv.visitTypeInsn(CHECKCAST, NMS + "/Packet");
mv.visitMethodInsn(INVOKEVIRTUAL,
NMS + "/PlayerConnection",
"sendPacket",
"(" + desc(NMS + "/Packet") + ")V", false);
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
cw.visitEnd();
return cw.toByteArray();
}
}