Event.java
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/*
* This file is part of LiteLoader.
* Copyright (C) 2012-16 Adam Mummery-Smith
* All Rights Reserved.
*/
package com.mumfrey.liteloader.transformers.event;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import org.spongepowered.asm.lib.Label;
import org.spongepowered.asm.lib.Opcodes;
import org.spongepowered.asm.lib.Type;
import org.spongepowered.asm.lib.tree.*;
import org.spongepowered.asm.util.Bytecode;
import com.mumfrey.liteloader.core.runtime.Obf;
import com.mumfrey.liteloader.util.log.LiteLoaderLogger;
/**
* An injectable "event". An event is like a regular callback except that it is
* more intelligent about where it can be injected in the bytecode and also
* supports conditional "cancellation", which is the ability to conditionally
* return from the containing method with a custom return value.
*
* @author Adam Mummery-Smith
*/
public class Event implements Comparable<Event>
{
/**
* Natural ordering of events, for use with sorting events which have the
* same priority.
*/
private static int eventOrder = 0;
/**
* All the events which exist and their registered listeners
*/
private static final Set<Event> events = new HashSet<Event>();
private static final List<Map<MethodNode, List<Event>>> proxyHandlerMethods = new ArrayList<Map<MethodNode, List<Event>>>();
private static int proxyInnerClassIndex = 1;
static
{
Event.resizeProxyList();
}
/**
* The name of this event
*/
protected final String name;
/**
* Whether this event is cancellable - if it is cancellable then the
* isCancelled() -> RETURN code will be injected.
*/
protected final boolean cancellable;
/**
* Natural order of this event, for sorting
*/
private final int order;
/**
* Priority of this event, for sorting
*/
private final int priority;
private Set<MethodInfo> listeners = new HashSet<MethodInfo>();
/**
* Method this event is currently "attached" to, we "attach" at the
* beginning of a method injection in order to save recalculating things
* like the return type and descriptor for each invocation, this means we
* need to calculate these things at most once for each method this event is
* injecting into.
*/
protected MethodNode method;
/**
* Descriptor for this event in the context of the attached method
*/
protected String eventDescriptor;
/**
* Method's original MAXS, used as a base to work out whether we need to
* increase the MAXS value.
*/
protected int methodMAXS = 0;
/**
* True if the attached method is static, used so that we know whether to
* push "this" onto the stack when constructing the EventInfo, or "null"
*/
protected boolean methodIsStatic;
/**
* Return type for the attached method, used to determine which EventInfo
* class to use and which method to invoke.
*/
protected Type methodReturnType;
protected String eventInfoClass;
protected Set<MethodInfo> pendingInjections;
private int injectionCount = 0;
protected boolean verbose;
protected Event(String name, boolean cancellable, int priority)
{
this.name = name.toLowerCase();
this.priority = priority;
this.order = Event.eventOrder++;
this.cancellable = cancellable;
this.verbose = true;
if (Event.events.contains(this))
{
throw new IllegalArgumentException("Event " + name + " is already defined");
}
Event.events.add(this);
}
/**
* Creates a new event with the specified name, if an event with the
* specified name already exists then the existing event is returned
* instead.
*
* @param name Event name (case insensitive)
* @return new Event instance or existing Event instance
*/
public static Event getOrCreate(String name)
{
return Event.getOrCreate(name, false, 1000, false);
}
/**
* Creates a new event with the specified name, if an event with the
* specified name already exists then the existing event is returned
* instead.
*
* @param name Event name (case insensitive)
* @param cancellable True if the event should be created as cancellable
* @return new Event instance or existing Event instance
*/
public static Event getOrCreate(String name, boolean cancellable)
{
return Event.getOrCreate(name, cancellable, 1000, true);
}
/**
* Creates a new event with the specified name, if an event with the
* specified name already exists then the existing event is returned
* instead.
*
* @param name Event name (case insensitive)
* @param cancellable True if the event should be created as cancellable
* @param priority Priority for the event, only used when multiple events
* are being injected at the same instruction
* @return new Event instance or existing Event instance
*/
public static Event getOrCreate(String name, boolean cancellable, int priority)
{
return getOrCreate(name, cancellable, priority, true);
}
protected static Event getOrCreate(String name, boolean cancellable, int priority, boolean defining)
{
Event event = Event.getEvent(name);
if (event != null)
{
if (!event.cancellable && cancellable && defining)
{
throw new IllegalArgumentException("Attempted to define the event " + event.name + " with cancellable '"
+ cancellable + "' but the event is already defined with cancellable is '" + event.cancellable + "'");
}
return event;
}
return new Event(name, cancellable, priority);
}
/**
* Get the name of the event (all lowercase)
*/
public String getName()
{
return this.name;
}
/**
* Get whether this event is cancellable or not
*/
public boolean isCancellable()
{
return this.cancellable;
}
/**
* Get the event priority
*/
public int getPriority()
{
return this.priority;
}
/**
* Set whether to log at INFO or DEBUG
*/
public Event setVerbose(boolean verbose)
{
this.verbose = verbose;
return this;
}
/**
* Get whether to log at INFO or DEBUG
*/
public boolean isVerbose()
{
return this.verbose;
}
/**
* Get whether this event is currently attached to a method
*/
public boolean isAttached()
{
return this.method != null;
}
/**
* Attaches this event to a particular method, this occurs before injection
* in order to allow the event to configure its internal state appropriately
* for the method's signature. Since a single event may be injected into
* multiple target methods, and may also be injected at multiple points in
* the same method, this saves us recalculating this information for every
* injection, and instead just calculate once per method.
*
* @param method Method to attach to
*/
void attach(final MethodNode method)
{
if (this.method != null)
{
throw new IllegalStateException("Attempted to attach the event " + this.name + " to " + method.name
+ " but the event was already attached to " + this.method.name + "!");
}
this.method = method;
this.methodReturnType = Type.getReturnType(method.desc);
this.methodMAXS = method.maxStack;
this.methodIsStatic = (method.access & Opcodes.ACC_STATIC) == Opcodes.ACC_STATIC;
this.eventInfoClass = this.getEventInfoClassName();
this.eventDescriptor = String.format("(L%s;%s)V", this.eventInfoClass, method.desc.substring(1, method.desc.indexOf(')')));
}
/**
* Detach from the attached method, called once injection is completed for a
* particular method.
*/
void detach()
{
this.method = null;
}
void addPendingInjection(MethodInfo targetMethod)
{
if (this.pendingInjections == null)
{
this.pendingInjections = new HashSet<MethodInfo>();
}
this.pendingInjections.add(targetMethod);
}
void notifyInjected(String method, String desc, String className)
{
MethodInfo thisInjection = null;
if (this.pendingInjections != null)
{
for (MethodInfo pendingInjection : this.pendingInjections)
{
if (pendingInjection.matches(method, desc, className))
{
thisInjection = pendingInjection;
break;
}
}
}
if (thisInjection != null)
{
this.pendingInjections.remove(thisInjection);
}
}
int dumpInjectionState()
{
int uninjectedCount = 0;
int pendingInjectionCount = this.pendingInjections != null ? this.pendingInjections.size() : 0;
LiteLoaderLogger.debug(" Event: %-40s Injected: %d Pending: %d %s", this.name, this.injectionCount, pendingInjectionCount,
this.injectionCount == 0 ? " <<< NOT INJECTED >>>" : "");
if (pendingInjectionCount > 0)
{
for (MethodInfo pending : this.pendingInjections)
{
LiteLoaderLogger.debug(" Pending: %s.%s", pending.getOwners(), pending.toString());
uninjectedCount++;
}
}
return uninjectedCount;
}
/**
* Pre-flight check
*
* @param injectionPoint
* @param cancellable
* @param globalEventID
*/
protected void validate(final AbstractInsnNode injectionPoint, boolean cancellable, final int globalEventID)
{
if (this.method == null)
{
throw new IllegalStateException("Attempted to inject the event " + this.name + " but the event is not attached!");
}
}
/**
* Inject bytecode for this event into the currently attached method. When
* multiple events want to be injected into the same method at the same
* point only the first event is injected, subsequent events are simply
* added to the same handler delegate in the EventProxy class.
*
* @param injectionPoint Point to inject code, new instructions will be
* injected directly ahead of the specifed insn
* @param cancellable Cancellable flag, if true then the cancellation code
* (conditional return) will be injected as well
* @param globalEventID Global event ID, used to map a callback to the
* relevant event handler delegate method in EventProxy
*
* @return MethodNode for the event handler delegate
*/
final MethodNode inject(final AbstractInsnNode injectionPoint, boolean cancellable, final int globalEventID, final boolean captureLocals,
final Type[] locals)
{
// Pre-flight checks
this.validate(injectionPoint, cancellable, globalEventID);
Type[] arguments = Type.getArgumentTypes(this.method.desc);
int initialFrameSize = Bytecode.getFirstNonArgLocalIndex(arguments, !this.methodIsStatic);
boolean doCaptureLocals = captureLocals && locals != null && locals.length > initialFrameSize;
String eventDescriptor = this.generateEventDescriptor(doCaptureLocals, locals, arguments, initialFrameSize);
// Create the handler delegate method
MethodNode handler = new MethodNode(Opcodes.ACC_PUBLIC | Opcodes.ACC_STATIC | Opcodes.ACC_SYNTHETIC, Event.getHandlerName(globalEventID),
eventDescriptor, null, null);
Event.addMethodToActiveProxy(handler);
LiteLoaderLogger.debug("Event %s is spawning handler %s in class %s", this.name, handler.name, Event.getActiveProxyRef());
int ctorMAXS = 0, invokeMAXS = arguments.length + (doCaptureLocals ? locals.length - initialFrameSize : 0);
int marshallVar = this.method.maxLocals++;
InsnList insns = new InsnList();
boolean pushReturnValue = false;
// If this is a ReturnEventInfo AND we are right before a RETURN opcode (so we can expect the *original* return
// value to be on the stack, then we dup the return value into a local var so we can push it later when we invoke
// the ReturnEventInfo ctor
if (injectionPoint instanceof InsnNode && injectionPoint.getOpcode() >= Opcodes.IRETURN && injectionPoint.getOpcode() < Opcodes.RETURN)
{
pushReturnValue = true;
insns.add(new InsnNode(Opcodes.DUP));
insns.add(new VarInsnNode(this.methodReturnType.getOpcode(Opcodes.ISTORE), marshallVar));
}
// Instance the EventInfo for this event
insns.add(new TypeInsnNode(Opcodes.NEW, this.eventInfoClass)); ctorMAXS++;
insns.add(new InsnNode(Opcodes.DUP)); ctorMAXS++; invokeMAXS++;
ctorMAXS += this.invokeEventInfoConstructor(insns, cancellable, pushReturnValue, marshallVar);
insns.add(new VarInsnNode(Opcodes.ASTORE, marshallVar));
// Call the event handler method in the proxy
insns.add(new VarInsnNode(Opcodes.ALOAD, marshallVar));
Bytecode.loadArgs(arguments, insns, this.methodIsStatic ? 0 : 1);
if (doCaptureLocals)
{
Bytecode.loadArgs(locals, insns, initialFrameSize);
}
insns.add(new MethodInsnNode(Opcodes.INVOKESTATIC, Event.getActiveProxyRef(), handler.name, handler.desc, false));
if (cancellable)
{
// Inject the if (e.isCancelled()) return e.getReturnValue();
this.injectCancellationCode(insns, injectionPoint, marshallVar);
}
// Inject our generated code into the method
this.method.instructions.insertBefore(injectionPoint, insns);
this.method.maxStack = Math.max(this.method.maxStack, Math.max(this.methodMAXS + ctorMAXS, this.methodMAXS + invokeMAXS));
return handler;
}
private String generateEventDescriptor(final boolean captureLocals, final Type[] locals, Type[] argumentTypes, int startIndex)
{
if (!captureLocals) return this.eventDescriptor;
String eventDescriptor = this.eventDescriptor.substring(0, this.eventDescriptor.indexOf(')'));
for (int l = startIndex; l < locals.length; l++)
{
if (locals[l] != null) eventDescriptor += locals[l].getDescriptor();
}
return eventDescriptor + ")V";
}
protected int invokeEventInfoConstructor(InsnList insns, boolean cancellable, boolean pushReturnValue, int marshallVar)
{
int ctorMAXS = 0;
insns.add(new LdcInsnNode(this.name)); ctorMAXS++;
insns.add(this.methodIsStatic ? new InsnNode(Opcodes.ACONST_NULL) : new VarInsnNode(Opcodes.ALOAD, 0)); ctorMAXS++;
insns.add(new InsnNode(cancellable ? Opcodes.ICONST_1 : Opcodes.ICONST_0)); ctorMAXS++;
if (pushReturnValue)
{
insns.add(new VarInsnNode(this.methodReturnType.getOpcode(Opcodes.ILOAD), marshallVar));
insns.add(new MethodInsnNode(Opcodes.INVOKESPECIAL, this.eventInfoClass, Obf.constructor.name,
EventInfo.getConstructorDescriptor(this.methodReturnType), false));
}
else
{
insns.add(new MethodInsnNode(Opcodes.INVOKESPECIAL, this.eventInfoClass, Obf.constructor.name,
EventInfo.getConstructorDescriptor(), false));
}
return ctorMAXS;
}
protected String getEventInfoClassName()
{
return EventInfo.getEventInfoClassName(this.methodReturnType).replace('.', '/');
}
/**
* if (e.isCancelled()) return e.getReturnValue();
*
* @param insns
* @param injectionPoint
* @param marshallVar
*/
protected void injectCancellationCode(final InsnList insns, final AbstractInsnNode injectionPoint, int marshallVar)
{
insns.add(new VarInsnNode(Opcodes.ALOAD, marshallVar));
insns.add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL, this.eventInfoClass, EventInfo.getIsCancelledMethodName(),
EventInfo.getIsCancelledMethodSig(), false));
LabelNode notCancelled = new LabelNode();
insns.add(new JumpInsnNode(Opcodes.IFEQ, notCancelled));
// If this is a void method, just injects a RETURN opcode, otherwise we need to get the return value from the EventInfo
this.injectReturnCode(insns, injectionPoint, marshallVar);
insns.add(notCancelled);
}
/**
* Inject the appropriate return code for the method type
*
* @param insns
* @param injectionPoint
* @param eventInfoVar
*/
protected void injectReturnCode(final InsnList insns, final AbstractInsnNode injectionPoint, int eventInfoVar)
{
if (this.methodReturnType.equals(Type.VOID_TYPE))
{
// Void method, so just return void
insns.add(new InsnNode(Opcodes.RETURN));
}
else
{
// Non-void method, so work out which accessor to call to get the return value, and return it
insns.add(new VarInsnNode(Opcodes.ALOAD, eventInfoVar));
String accessor = ReturnEventInfo.getReturnAccessor(this.methodReturnType);
String descriptor = ReturnEventInfo.getReturnDescriptor(this.methodReturnType);
insns.add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL, this.eventInfoClass, accessor, descriptor, false));
if (this.methodReturnType.getSort() == Type.OBJECT)
{
insns.add(new TypeInsnNode(Opcodes.CHECKCAST, this.methodReturnType.getInternalName()));
}
insns.add(new InsnNode(this.methodReturnType.getOpcode(Opcodes.IRETURN)));
}
}
/**
* Add this event to the specified handler
*
* @param handler
*/
void addToHandler(MethodNode handler)
{
LiteLoaderLogger.debug("Adding event %s to handler %s", this.name, handler.name);
Event.getEventsForHandlerMethod(handler).add(this);
this.injectionCount++;
}
/**
* Add a listener for this event, the listener
*
* @param listener
* @return fluent interface
*/
public Event addListener(MethodInfo listener)
{
if (listener.hasDesc())
{
throw new IllegalArgumentException("Descriptor is not allowed for listener methods");
}
if (this.pendingInjections != null && this.pendingInjections.size() == 0)
{
throw new EventAlreadyInjectedException("The event " + this.name
+ " was already injected and has 0 pending injections, addListener() is not allowed at this point");
}
this.listeners.add(listener);
return this;
}
/**
* Get currently registered listeners for this event
*/
public Set<MethodInfo> getListeners()
{
return Collections.<MethodInfo>unmodifiableSet(this.listeners);
}
/**
* Get an event by name (case insensitive)
*
* @param eventName
*/
static Event getEvent(String eventName)
{
for (Event event : Event.events)
{
if (event.name.equalsIgnoreCase(eventName))
{
return event;
}
}
return null;
}
/**
* Populates the event proxy class with delegating methods for all injected
* events.
*
* @param classNode
* @param proxyIndex
*/
static ClassNode populateProxy(final ClassNode classNode, int proxyIndex)
{
int handlerCount = 0;
int invokeCount = 0;
int lineNumber = proxyIndex < 2 ? 210 : 10; // From EventProxy.java, this really is only to try and make stack traces a bit easier to read
LiteLoaderLogger.info("Generating new Event Handler Proxy Class %s", classNode.name.replace('/', '.'));
Map<MethodNode, List<Event>> handlerMethods = Event.proxyHandlerMethods.get(Event.proxyInnerClassIndex);
Event.proxyInnerClassIndex++;
// Loop through all handlers and inject a method for each one
for (Entry<MethodNode, List<Event>> handler : handlerMethods.entrySet())
{
MethodNode handlerMethod = handler.getKey();
List<Event> handlerEvents = handler.getValue();
// Args is used to inject appropriate LOAD opcodes to put the method arguments on the stack for each handler invocation
Type[] args = Type.getArgumentTypes(handlerMethod.desc);
// Add our generated method to the the class
classNode.methods.add(handlerMethod);
handlerCount++;
InsnList insns = handlerMethod.instructions;
for (Event event : handlerEvents)
{
Set<MethodInfo> listeners = event.listeners;
if (listeners.size() > 0)
{
LabelNode tryCatchStart = new LabelNode();
LabelNode tryCatchEnd = new LabelNode();
LabelNode tryCatchHandler1 = new LabelNode();
LabelNode tryCatchHandler2 = new LabelNode();
LabelNode tryCatchExit = new LabelNode();
handlerMethod.tryCatchBlocks.add(new TryCatchBlockNode(tryCatchStart, tryCatchEnd,
tryCatchHandler1, "java/lang/NoSuchMethodError"));
handlerMethod.tryCatchBlocks.add(new TryCatchBlockNode(tryCatchStart, tryCatchEnd,
tryCatchHandler2, "java/lang/NoClassDefFoundError"));
insns.add(tryCatchStart); // try {
for (MethodInfo listener : listeners)
{
invokeCount++;
LabelNode lineNumberLabel = new LabelNode(new Label());
insns.add(lineNumberLabel);
insns.add(new LineNumberNode(++lineNumber, lineNumberLabel));
Bytecode.loadArgs(args, insns, 0);
insns.add(new MethodInsnNode(Opcodes.INVOKESTATIC, listener.ownerRef, listener.getOrInflectName(event.name),
handlerMethod.desc, false));
}
insns.add(tryCatchEnd); // }
insns.add(new JumpInsnNode(Opcodes.GOTO, tryCatchExit));
insns.add(tryCatchHandler1); // catch (NoSuchMethodError err) {
insns.add(new VarInsnNode(Opcodes.ALOAD, 0));
insns.add(new MethodInsnNode(Opcodes.INVOKESTATIC, Obf.EventProxy.ref, "onMissingHandler",
"(Ljava/lang/Error;Lcom/mumfrey/liteloader/transformers/event/EventInfo;)V", false));
insns.add(new JumpInsnNode(Opcodes.GOTO, tryCatchExit));
insns.add(tryCatchHandler2); // } catch (NoClassDefFoundError err) {
insns.add(new VarInsnNode(Opcodes.ALOAD, 0));
insns.add(new MethodInsnNode(Opcodes.INVOKESTATIC, Obf.EventProxy.ref, "onMissingClass",
"(Ljava/lang/Error;Lcom/mumfrey/liteloader/transformers/event/EventInfo;)V", false));
insns.add(new JumpInsnNode(Opcodes.GOTO, tryCatchExit));
insns.add(tryCatchExit); // }
}
}
insns.add(new InsnNode(Opcodes.RETURN));
}
LiteLoaderLogger.info("Successfully generated event handler proxy class with %d handlers(s) and %d total invocations",
handlerCount, invokeCount);
return classNode;
}
private static List<Event> addMethodToActiveProxy(MethodNode handlerMethod)
{
Event.resizeProxyList();
ArrayList<Event> events = new ArrayList<Event>();
Event.proxyHandlerMethods.get(Event.proxyInnerClassIndex).put(handlerMethod, events);
return events;
}
private static void resizeProxyList()
{
while (Event.proxyHandlerMethods.size() < Event.proxyInnerClassIndex + 1)
{
Event.proxyHandlerMethods.add(new LinkedHashMap<MethodNode, List<Event>>());
}
}
private static List<Event> getEventsForHandlerMethod(MethodNode handlerMethod)
{
for (Map<MethodNode, List<Event>> handlers : Event.proxyHandlerMethods)
{
List<Event> events = handlers.get(handlerMethod);
if (events != null) return events;
}
return Event.addMethodToActiveProxy(handlerMethod);
}
private static String getHandlerName(int globalEventID)
{
return String.format("$event%05x", globalEventID);
}
private static String getActiveProxyRef()
{
return Obf.EventProxy.ref + (Event.proxyInnerClassIndex > 1 ? "$" + Event.proxyInnerClassIndex : "");
}
@Override
public int compareTo(Event other)
{
if (other == null) return 0;
if (other.priority == this.priority) return this.order - other.order;
return (this.priority - other.priority);
}
@Override
public int hashCode()
{
return this.name.hashCode();
}
@Override
public boolean equals(Object other)
{
if (other == this) return true;
if (other instanceof Event) return ((Event)other).name.equals(this.name);
return false;
}
@Override
public String toString()
{
return this.name;
}
}