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Truffle is a multi-language framework for executing dynamic languages
that achieves high performance when combined with Graal.
/*
* Copyright (c) 2016, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* The Universal Permissive License (UPL), Version 1.0
*
* Subject to the condition set forth below, permission is hereby granted to any
* person obtaining a copy of this software, associated documentation and/or
* data (collectively the "Software"), free of charge and under any and all
* copyright rights in the Software, and any and all patent rights owned or
* freely licensable by each licensor hereunder covering either (i) the
* unmodified Software as contributed to or provided by such licensor, or (ii)
* the Larger Works (as defined below), to deal in both
*
* (a) the Software, and
*
* (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
* one is included with the Software each a "Larger Work" to which the Software
* is contributed by such licensors),
*
* without restriction, including without limitation the rights to copy, create
* derivative works of, display, perform, and distribute the Software and make,
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* Software and the Larger Work(s), and to sublicense the foregoing rights on
* either these or other terms.
*
* This license is subject to the following condition:
*
* The above copyright notice and either this complete permission notice or at a
* minimum a reference to the UPL must be included in all copies or substantial
* portions of the Software.
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package com.oracle.truffle.api.instrumentation;
import java.io.PrintStream;
import java.lang.ref.WeakReference;
import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.Set;
import java.util.concurrent.locks.Lock;
import com.oracle.truffle.api.Assumption;
import com.oracle.truffle.api.CompilerAsserts;
import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.Truffle;
import com.oracle.truffle.api.frame.FrameDescriptor;
import com.oracle.truffle.api.frame.FrameSlot;
import com.oracle.truffle.api.frame.FrameSlotTypeException;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.instrumentation.InstrumentableNode.WrapperNode;
import com.oracle.truffle.api.instrumentation.InstrumentationHandler.EngineInstrumenter;
import com.oracle.truffle.api.instrumentation.InstrumentationHandler.InstrumentClientInstrumenter;
import com.oracle.truffle.api.nodes.ExplodeLoop;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.nodes.NodeCost;
import com.oracle.truffle.api.nodes.NodeUtil;
import com.oracle.truffle.api.nodes.NodeVisitor;
import com.oracle.truffle.api.nodes.RootNode;
import com.oracle.truffle.api.source.SourceSection;
/**
*
* Represents an event sink for instrumentation events that is embedded in the AST using wrappers if
* needed. Instances of this class are provided by
* {@link InstrumentableNode#createWrapper(ProbeNode)} to notify the instrumentation API about
* execution events.
*
*
* It is strongly recommended to use {@link GenerateWrapper} to generate implementations of wrapper
* nodes. If needed to be done manually then the recommended implementation of an execute method
* looks as follows:
*
*
* @Override
* public Object execute(VirtualFrame frame) {
* Object returnValue;
* for (;;) {
* boolean wasOnReturnExecuted = false;
* try {
* probeNode.onEnter(frame);
* returnValue = delegateNode.executeGeneric(frame);
* wasOnReturnExecuted = true;
* probeNode.onReturnValue(frame, returnValue);
* break;
* } catch (Throwable t) {
* Object result = probeNode.onReturnExceptionalOrUnwind(frame, t, wasOnReturnExecuted);
* if (result == ProbeNode.UNWIND_ACTION_REENTER) {
* continue;
* } else if (result != null) {
* returnValue = result;
* break;
* }
* throw t;
* }
* }
* return returnValue;
* }
*
*
* @since 0.12
*/
public final class ProbeNode extends Node {
private static final int SEEN_UNWIND = 0b1;
private static final int SEEN_UNWIND_NEXT = 0b10;
private static final int SEEN_RETURN = 0b100;
private static final int SEEN_REENTER = 0b1000;
/**
* A constant that performs reenter of the current node when returned from
* {@link ExecutionEventListener#onUnwind(EventContext, VirtualFrame, Object)} or
* {@link ExecutionEventNode#onUnwind(VirtualFrame, Object)}.
*
* @since 0.31
*/
public static final Object UNWIND_ACTION_REENTER = new Object();
// returned from chain nodes whose bindings ignore the unwind
private static final Object UNWIND_ACTION_IGNORED = new Object();
static class RetiredNodeReference {
private final WeakReference node;
private final Set> materializeTags;
final RetiredNodeReference next;
RetiredNodeReference(Node node, Set> materializeTags, RetiredNodeReference next) {
this.node = new WeakReference<>(node);
this.materializeTags = materializeTags;
this.next = next;
}
Node getNode() {
return node.get();
}
}
private final InstrumentationHandler handler;
private volatile RetiredNodeReference retiredNodeReference;
@CompilationFinal private volatile EventContext context;
@Child private volatile ProbeNode.EventChainNode chain;
/*
* We cache to ensure that the instrumented tags and source sections are always compilation
* final for listeners and factories.
*/
@CompilationFinal private volatile Assumption version;
@CompilationFinal private volatile int seen = 0;
/** Instantiated by the instrumentation framework. */
ProbeNode(InstrumentationHandler handler, SourceSection sourceSection) {
this.handler = handler;
this.context = new EventContext(this, sourceSection);
}
RetiredNodeReference getRetiredNodeReference() {
return retiredNodeReference;
}
void clearRetiredNodeReference() {
retiredNodeReference = null;
}
private boolean hasNewTags(Node retiredNode, Set> materializeTags) {
Set> allSeenMaterializeTags = retiredNodeReference.next == null ? retiredNodeReference.materializeTags : new HashSet<>(retiredNodeReference.materializeTags);
RetiredNodeReference nodeRef = retiredNodeReference;
while (nodeRef != null) {
if (allSeenMaterializeTags != nodeRef.materializeTags) {
allSeenMaterializeTags.addAll(nodeRef.materializeTags);
}
Node nodeRefNode = nodeRef.getNode();
assert nodeRefNode == null || nodeRefNode != retiredNode : "The same retired node must not be set more than once!";
assert !nodeRef.materializeTags.equals(materializeTags) : "Retired node must be set at most once for the same set of tags!";
nodeRef = nodeRef.next;
}
return !allSeenMaterializeTags.containsAll(materializeTags);
}
void setRetiredNode(Node retiredNode, Set> materializeTags) {
if (retiredNodeReference == null) {
retiredNodeReference = new RetiredNodeReference(retiredNode, materializeTags, null);
} else {
/*
* The following check does not check all illegal materializations, because seen
* materialize tags are not recorded before the AST is first executed.
*/
assert hasNewTags(retiredNode, materializeTags) : "There should always be some new materialize tag!";
RetiredNodeReference previousRetiredNodeReference = retiredNodeReference;
RetiredNodeReference newRetiredNodeReference = new RetiredNodeReference(retiredNode, materializeTags, previousRetiredNodeReference);
retiredNodeReference = newRetiredNodeReference;
}
}
/**
* Should get invoked before the node is invoked.
*
* @param frame the current frame of the execution.
* @since 0.12
*/
public void onEnter(VirtualFrame frame) {
EventChainNode localChain = lazyUpdate(frame);
if (localChain != null) {
EventChainNode.onEnter(localChain, context, frame);
}
}
/**
* Should get invoked after the node is invoked successfully.
*
* @param result the result value of the operation, must be an interop type (i.e. either
* implementing TruffleObject or be a primitive value), or null.
* @param frame the current frame of the execution.
* @since 0.12
*/
public void onReturnValue(VirtualFrame frame, Object result) {
EventChainNode localChain = lazyUpdate(frame);
assert isNullOrInteropValue(result);
if (localChain != null) {
EventChainNode.onReturnValue(localChain, context, frame, result);
}
}
private boolean isNullOrInteropValue(Object result) {
if (!(context.getInstrumentedNode() instanceof InstrumentableNode)) {
// legacy support
return true;
}
if (result == null) {
return true;
}
InstrumentAccessor.interopAccess().checkInteropType(result);
return true;
}
/**
* Creates a shallow copy of this node.
*
* @return the new copy
* @since 0.31
*/
@Override
public Node copy() {
ProbeNode pn = (ProbeNode) super.copy();
pn.context = new EventContext(pn, context.getInstrumentedSourceSection());
return pn;
}
/**
* Should get invoked if the node did not complete successfully and handle a possible unwind.
* When a non-null value is returned, a change of the execution path was requested
* by an {@link EventContext#createUnwind(Object) unwind}.
*
* @param exception the exception that occurred during the execution
* @param frame the current frame of the execution.
* @param isReturnCalled true when {@link #onReturnValue(VirtualFrame, Object)} was
* called already for this node's execution, false otherwise. This helps
* to assure correct pairing of enter/return notifications.
* @return null to proceed to throw of the exception,
* {@link #UNWIND_ACTION_REENTER} to reenter the current node, or an interop value to
* return that value early from the current node (void nodes just return, ignoring the
* return value).
* @since 0.31
*/
public Object onReturnExceptionalOrUnwind(VirtualFrame frame, Throwable exception, boolean isReturnCalled) {
UnwindException unwind = null;
if (exception instanceof UnwindException) {
profileBranch(SEEN_UNWIND);
unwind = (UnwindException) exception;
} else if (exception instanceof ThreadDeath) {
throw (ThreadDeath) exception;
}
EventChainNode localChain = lazyUpdate(frame);
if (localChain != null) {
if (!isReturnCalled) {
try {
EventChainNode.onReturnExceptional(localChain, context, frame, exception);
} catch (UnwindException ex) {
profileBranch(SEEN_UNWIND);
if (unwind != null && unwind != ex) {
profileBranch(SEEN_UNWIND_NEXT);
unwind.addNext(ex);
} else {
unwind = ex;
}
}
}
if (unwind != null) { // seenUnwind must be true here
Object ret = EventChainNode.onUnwind(localChain, context, frame, unwind);
if (ret == UNWIND_ACTION_REENTER) {
profileBranch(SEEN_REENTER);
return UNWIND_ACTION_REENTER;
} else if (ret != null && ret != UNWIND_ACTION_IGNORED) {
profileBranch(SEEN_RETURN);
assert isNullOrInteropValue(ret);
return ret;
}
throw unwind;
}
}
return null;
}
private void profileBranch(int flag) {
if ((seen & flag) == 0) { // if not seen
CompilerDirectives.transferToInterpreterAndInvalidate();
seen = seen | flag;
}
}
void onInputValue(VirtualFrame frame, EventBinding targetBinding, EventContext inputContext, int inputIndex, Object inputValue) {
EventChainNode localChain = lazyUpdate(frame);
if (localChain != null) {
EventChainNode.onInputValue(localChain, context, frame, targetBinding, inputContext, inputIndex, inputValue);
}
}
EventContext getContext() {
return context;
}
WrapperNode findWrapper() throws AssertionError {
Node parent = getParent();
if (!(parent instanceof WrapperNode)) {
CompilerDirectives.transferToInterpreterAndInvalidate();
if (parent == null) {
throw new AssertionError("Probe node disconnected from AST.");
} else {
throw new AssertionError("ProbeNodes must have a parent Node that implements NodeWrapper.");
}
}
return (WrapperNode) parent;
}
synchronized void invalidate() {
Assumption localVersion = this.version;
if (localVersion != null) {
localVersion.invalidate();
}
}
EventChainNode lazyUpdate(VirtualFrame frame) {
Assumption localVersion = this.version;
if (localVersion == null || !localVersion.isValid()) {
CompilerDirectives.transferToInterpreterAndInvalidate();
// Ok to pass in the virtual frame as its instances are always materialized
return lazyUpdatedImpl(frame);
}
return this.chain;
}
private EventChainNode lazyUpdatedImpl(VirtualFrame frame) {
EventChainNode oldChain;
EventChainNode nextChain;
Lock lock = getLock();
lock.lock();
try {
Assumption localVersion = this.version;
if (localVersion != null && localVersion.isValid()) {
return this.chain;
}
EventBinding.Source[] executionBindingsSnapshot;
do {
executionBindingsSnapshot = handler.getExecutionBindingsSnapshot();
nextChain = handler.createBindings(frame, ProbeNode.this, executionBindingsSnapshot);
if (nextChain == null) {
// chain is null -> remove wrapper;
// Note: never set child nodes to null, can cause races
if (retiredNodeReference == null) {
InstrumentationHandler.removeWrapper(ProbeNode.this);
return null;
} else {
oldChain = this.chain;
this.chain = null;
}
} else {
oldChain = this.chain;
this.chain = insert(nextChain);
}
this.version = Truffle.getRuntime().createAssumption("Instruments unchanged");
} while (executionBindingsSnapshot != handler.getExecutionBindingsSnapshot());
assert context.validEventContextOnLazyUpdate();
} finally {
lock.unlock();
}
if (oldChain != null) {
EventChainNode.onDispose(oldChain, context, frame);
}
return nextChain;
}
ExecutionEventNode lookupExecutionEventNode(EventBinding binding) {
if (binding.isDisposed()) {
return null;
}
EventChainNode chainNode = this.chain;
while (chainNode != null) {
if (chainNode.binding == binding) {
if (chainNode instanceof EventProviderChainNode) {
return ((EventProviderChainNode) chainNode).eventNode;
}
}
chainNode = chainNode.next;
}
return null;
}
Iterator lookupExecutionEventNodes(Collection> bindings) {
return new Iterator() {
private EventChainNode chainNode = ProbeNode.this.chain;
private EventProviderChainNode nextNode;
@Override
public boolean hasNext() {
if (nextNode == null) {
while (chainNode != null) {
if (chainNode instanceof EventProviderChainNode && bindings.contains(chainNode.binding)) {
nextNode = (EventProviderChainNode) chainNode;
chainNode = chainNode.next;
break;
}
chainNode = chainNode.next;
}
}
return nextNode != null;
}
@Override
public ExecutionEventNode next() {
EventProviderChainNode node = nextNode;
if (node == null) {
throw new NoSuchElementException();
}
nextNode = null;
return node.eventNode;
}
};
}
EventChainNode createParentEventChainCallback(VirtualFrame frame, EventBinding.Source binding, RootNode rootNode, Set> providedTags) {
EventChainNode parent = findParentChain(frame, binding);
if (!(parent instanceof EventProviderWithInputChainNode)) {
// this event is unreachable because nobody is listening to it.
return null;
}
EventContext parentContext = parent.findProbe().getContext();
EventProviderWithInputChainNode parentChain = (EventProviderWithInputChainNode) parent;
int index = indexOfChild(binding, rootNode, providedTags, parentContext.getInstrumentedNode(), parentContext.getInstrumentedSourceSection(), context.getInstrumentedNode());
if (index < 0 || index >= parentChain.inputCount) {
// not found. a child got replaced?
// probe should have been notified about this with notifyInserted
assert throwIllegalASTAssertion(parentChain, parentContext, binding, rootNode, providedTags, index);
return null;
}
ProbeNode probe = parent.findProbe();
return new InputValueChainNode(binding, probe, context, index);
}
@SuppressWarnings("deprecation")
private static boolean throwIllegalASTAssertion(EventProviderWithInputChainNode parentChain, EventContext parentContext, EventBinding.Source binding, RootNode rootNode,
Set> providedTags, int index) {
StringBuilder msg = new StringBuilder();
try {
// number of additional children that will be looked up from the current index
// might not be enough depending on the violation.
final int lookupChildrenCount = 10;
SourceSection parentSourceSection = parentContext.getInstrumentedSourceSection();
EventContext[] contexts = findChildContexts(binding, rootNode, providedTags, parentContext.getInstrumentedNode(), parentContext.getInstrumentedSourceSection(),
Math.max(parentChain.inputCount, index + lookupChildrenCount));
int contextCount = 0;
for (int i = 0; i < contexts.length; i++) {
EventContext eventContext = contexts[i];
if (eventContext != null) {
contextCount++;
}
}
msg.append("Stable AST assumption violated. " + parentChain.inputCount + " children expected got " + contextCount);
msg.append("\n Parent: " + parentSourceSection);
for (int i = 0; i < contexts.length; i++) {
EventContext eventContext = contexts[i];
if (eventContext == null) {
continue;
}
msg.append("\nChild[" + i + "] = " + eventContext.getInstrumentedSourceSection());
Node node = eventContext.getInstrumentedNode();
String indent = " ";
while (node != null) {
msg.append("\n");
msg.append(indent);
if (node == parentContext.getInstrumentedNode()) {
msg.append("Parent");
break;
}
if (node.getParent() == null) {
msg.append("null parent = ");
} else {
String fieldName = NodeUtil.findChildField(node.getParent(), node).getName();
msg.append(node.getParent().getClass().getSimpleName() + "." + fieldName + " = ");
}
msg.append(node.getClass().getSimpleName() + "#" + System.identityHashCode(node));
indent += " ";
node = node.getParent();
}
}
} catch (Throwable e) {
// if assertion computation fails we need to fallback to some simplerm essage
AssertionError error = new AssertionError("Stable AST assumption violated");
error.addSuppressed(e);
throw error;
}
throw new AssertionError(msg.toString());
}
ProbeNode.EventChainNode createEventChainCallback(VirtualFrame frame, EventBinding.Source binding, RootNode rootNode, Set> providedTags, Node instrumentedNode,
SourceSection instrumentedNodeSourceSection) {
ProbeNode.EventChainNode next;
Object element = binding.getElement();
if (element instanceof ExecutionEventListener) {
next = new EventFilterChainNode(binding, (ExecutionEventListener) element);
} else {
assert element instanceof ExecutionEventNodeFactory;
ExecutionEventNode eventNode = createEventNode(binding, element);
if (eventNode == null) {
// error occurred creating the event node
return null;
}
if (binding.getInputFilter() != null) {
EventChainNode parent = findParentChain(frame, binding);
EventProviderWithInputChainNode parentChain = ((EventProviderWithInputChainNode) parent);
int baseInput;
if (parentChain == null) {
baseInput = 0;
} else {
EventContext parentContext = parentChain.findProbe().getContext();
int childIndex = indexOfChild(binding, rootNode, providedTags, parentContext.getInstrumentedNode(), parentContext.getInstrumentedSourceSection(), instrumentedNode);
int inputBaseIndex = parentChain.inputBaseIndex;
if (childIndex < 0) {
// be conservative if child could not be identified
baseInput = inputBaseIndex + parentChain.inputCount;
} else {
// we can reuse frame slots next silbing nodes for child nodes.
baseInput = inputBaseIndex + childIndex;
}
}
int inputCount = countChildren(binding, rootNode, providedTags, instrumentedNode, instrumentedNodeSourceSection);
next = new EventProviderWithInputChainNode(binding, eventNode, baseInput, inputCount);
} else {
next = new EventProviderChainNode(binding, eventNode);
}
}
return next;
}
static EventContext[] findChildContexts(EventBinding.Source binding, RootNode rootNode, Set> providedTags, Node instrumentedNode, SourceSection instrumentedNodeSourceSection,
int inputCount) {
InputChildContextLookup visitor = new InputChildContextLookup(binding, rootNode, providedTags, instrumentedNode, instrumentedNodeSourceSection, inputCount);
NodeUtil.forEachChild(instrumentedNode, visitor);
return visitor.foundContexts;
}
private static int indexOfChild(EventBinding.Source binding, RootNode rootNode, Set> providedTags, Node instrumentedNode, SourceSection instrumentedNodeSourceSection,
Node lookupChild) {
InputChildIndexLookup visitor = new InputChildIndexLookup(binding, rootNode, providedTags, instrumentedNode, instrumentedNodeSourceSection, lookupChild);
NodeUtil.forEachChild(instrumentedNode, visitor);
return visitor.found ? visitor.index : -1;
}
private static int countChildren(EventBinding.Source binding, RootNode rootNode, Set> providedTags, Node instrumentedNode, SourceSection instrumentedNodeSourceSection) {
InputChildIndexLookup visitor = new InputChildIndexLookup(binding, rootNode, providedTags, instrumentedNode, instrumentedNodeSourceSection, null);
NodeUtil.forEachChild(instrumentedNode, visitor);
return visitor.index;
}
private EventChainNode findParentChain(VirtualFrame frame, EventBinding binding) {
Node node = getParent().getParent();
while (node != null) {
if (node instanceof WrapperNode) {
ProbeNode probe = ((WrapperNode) node).getProbeNode();
EventChainNode c = probe.lazyUpdate(frame);
if (c != null) {
c = c.find(binding);
}
if (c != null) {
return c;
}
} else if (node instanceof RootNode) {
break;
}
node = node.getParent();
}
if (node == null) {
throw new IllegalStateException("The AST node is not yet adopted. ");
}
return null;
}
private ExecutionEventNode createEventNode(EventBinding.Source binding, Object element) {
ExecutionEventNode eventNode;
try {
eventNode = ((ExecutionEventNodeFactory) element).create(context);
if (eventNode != null && eventNode.getParent() != null) {
throw new IllegalStateException(String.format("Returned EventNode %s was already adopted by another AST.", eventNode));
}
} catch (Throwable t) {
if (t instanceof InstrumentException) {
CompilerDirectives.transferToInterpreterAndInvalidate();
throw new IllegalStateException(
String.format("Error propagation is not supported in %s.create(%s). "//
+ "Errors propagated in this method may result in an AST that never stabilizes. "//
+ "Propagate the error in one of the execution event node events like onEnter, onInputValue, onReturn or onReturnExceptional to resolve this problem.",
ExecutionEventNodeFactory.class.getSimpleName(),
EventContext.class.getSimpleName()));
}
exceptionEventForClientInstrument(binding, "ProbeNodeFactory.create", t);
return null;
}
return eventNode;
}
/**
* Handles exceptions from non-language instrumentation code that must not be allowed to alter
* guest language execution semantics. Normal response is to log and continue.
*/
@TruffleBoundary
static void exceptionEventForClientInstrument(EventBinding.Source b, String eventName, Throwable t) {
if (t instanceof ThreadDeath) {
// Terminates guest language execution immediately
throw (ThreadDeath) t;
}
final Object polyglotEngine = InstrumentAccessor.engineAccess().getCurrentPolyglotEngine();
if (b.getInstrumenter() instanceof EngineInstrumenter || (polyglotEngine != null && InstrumentAccessor.engineAccess().isInstrumentExceptionsAreThrown(polyglotEngine))) {
throw sthrow(RuntimeException.class, t);
}
// Exception is a failure in (non-language) instrumentation code; log and continue
InstrumentClientInstrumenter instrumenter = (InstrumentClientInstrumenter) b.getInstrumenter();
String message = String.format("Event %s failed for instrument class %s and listener/factory %s.", //
eventName, instrumenter.getInstrumentClassName(), b.getElement());
Exception exception = new Exception(message, t);
PrintStream stream = new PrintStream(instrumenter.getEnv().err());
exception.printStackTrace(stream);
}
/** @since 0.12 */
@Override
public NodeCost getCost() {
return NodeCost.NONE;
}
private static boolean checkInteropType(Object value, EventBinding.Source binding) {
if (value != null && value != UNWIND_ACTION_REENTER && value != UNWIND_ACTION_IGNORED && !InstrumentAccessor.ACCESSOR.isTruffleObject(value)) {
Class clazz = value.getClass();
if (!(clazz == Byte.class ||
clazz == Short.class ||
clazz == Integer.class ||
clazz == Long.class ||
clazz == Float.class ||
clazz == Double.class ||
clazz == Character.class ||
clazz == Boolean.class ||
clazz == String.class)) {
CompilerDirectives.transferToInterpreterAndInvalidate();
ClassCastException ccex = new ClassCastException(clazz.getName() + " isn't allowed Truffle interop type!");
if (binding.isLanguageBinding()) {
throw ccex;
} else {
exceptionEventForClientInstrument(binding, "onUnwind", ccex);
return false;
}
}
}
return true;
}
private static Object mergePostUnwindReturns(Object r1, Object r2) {
// Prefer unwind
if (r1 == null || r2 == null) {
return null;
}
if (r1 == UNWIND_ACTION_IGNORED) {
return r2;
}
if (r2 == UNWIND_ACTION_IGNORED) {
return r1;
}
// Prefer reenter over return
if (r1 == UNWIND_ACTION_REENTER || r2 == UNWIND_ACTION_REENTER) {
return UNWIND_ACTION_REENTER;
}
return r1; // The first one wins
}
@SuppressWarnings({"unchecked", "unused"})
private static T sthrow(Class type, Throwable t) throws T {
throw (T) t;
}
private static class InputChildContextLookup extends InstrumentableChildVisitor {
EventContext[] foundContexts;
int index;
InputChildContextLookup(EventBinding.Source binding, RootNode rootNode, Set> providedTags, Node instrumentedNode, SourceSection instrumentedNodeSourceSection, int childrenCount) {
super(binding, rootNode, providedTags, instrumentedNode, instrumentedNodeSourceSection);
this.foundContexts = new EventContext[childrenCount];
}
@Override
protected boolean visitChild(Node child) {
Node parent = child.getParent();
if (parent instanceof WrapperNode) {
ProbeNode probe = ((WrapperNode) parent).getProbeNode();
if (index < foundContexts.length) {
foundContexts[index] = probe.context;
} else {
assert false;
foundContexts = null;
return false;
}
} else {
// not yet materialized
assert false;
foundContexts = null;
return false;
}
index++;
return true;
}
}
private static class InputChildIndexLookup extends InstrumentableChildVisitor {
private final Node lookupNode;
boolean found = false;
int index;
InputChildIndexLookup(EventBinding.Source binding, RootNode rootNode, Set> providedTags, Node instrumentedNode, SourceSection instrumentedNodeSourceSection, Node lookupNode) {
super(binding, rootNode, providedTags, instrumentedNode, instrumentedNodeSourceSection);
this.lookupNode = lookupNode;
}
@Override
protected boolean visitChild(Node child) {
if (found) {
return false;
}
if (lookupNode == child) {
found = true;
return false;
}
index++;
return true;
}
}
private abstract static class InstrumentableChildVisitor implements NodeVisitor {
private final EventBinding.Source binding;
private final Set> providedTags;
private final RootNode rootNode;
private final Node instrumentedNode;
private final SourceSection instrumentedNodeSourceSection;
InstrumentableChildVisitor(EventBinding.Source binding, RootNode rootNode, Set> providedTags, Node instrumentedNode, SourceSection instrumentedNodeSourceSection) {
this.binding = binding;
this.providedTags = providedTags;
this.rootNode = rootNode;
this.instrumentedNode = instrumentedNode;
this.instrumentedNodeSourceSection = instrumentedNodeSourceSection;
}
public final boolean visit(Node node) {
SourceSection sourceSection = node.getSourceSection();
if (InstrumentationHandler.isInstrumentableNode(node)) {
if (binding.isChildInstrumentedFull(providedTags, rootNode, instrumentedNode, instrumentedNodeSourceSection, node, sourceSection)) {
if (!visitChild(node)) {
return false;
}
}
return true;
}
NodeUtil.forEachChild(node, this);
return true;
}
protected abstract boolean visitChild(Node child);
}
abstract static class EventChainNode extends Node {
private static final int SEEN_EXCEPTION_ON_ENTER = 0b1;
private static final int SEEN_EXCEPTION_ON_RETURN = 0b10;
private static final int SEEN_EXCEPTION_ON_RETURN_EXCEPTIONAL = 0b100;
private static final int SEEN_EXCEPTION_ON_INPUT_VALUE = 0b1000;
private static final int SEEN_EXCEPTION_ON_UNWIND = 0b10000;
private static final int SEEN_EXCEPTION_HAS_NEXT = 0b100000;
private static final int SEEN_EXCEPTION_INSTRUMENT = 0b1000000;
private static final int SEEN_EXCEPTION_OTHER = 0b10000000;
private static final int SEEN_UNWIND_ON_ENTER = 0b100000000;
private static final int SEEN_UNWIND_ON_RETURN = 0b1000000000;
private static final int SEEN_UNWIND_ON_RETURN_EXCEPTIONAL = 0b10000000000;
private static final int SEEN_UNWIND_ON_INPUT_VALUE = 0b100000000000;
private static final int SEEN_UNWIND_HAS_NEXT = 0b1000000000000;
private final EventBinding.Source binding;
@Child private ProbeNode.EventChainNode next; // effectively final
@CompilationFinal private ProbeNode.EventChainNode previous; // effectively final
@CompilationFinal private int seen;
EventChainNode(EventBinding.Source binding) {
this.binding = binding;
}
final ProbeNode findProbe() {
Node parent = this;
while (parent != null && !(parent instanceof ProbeNode)) {
parent = parent.getParent();
}
return (ProbeNode) parent;
}
final void setNext(ProbeNode.EventChainNode next) {
this.next = insert(next);
next.previous = this;
}
EventBinding.Source getBinding() {
return binding;
}
ProbeNode.EventChainNode getNext() {
return next;
}
@Override
public final NodeCost getCost() {
return NodeCost.NONE;
}
final void profileBranch(int flag) {
if ((seen & flag) == 0) { // if not seen
CompilerDirectives.transferToInterpreterAndInvalidate();
seen = seen | flag;
}
}
static void onDispose(EventChainNode eventChain, EventContext context, VirtualFrame frame) {
CompilerAsserts.neverPartOfCompilation();
EventChainNode chainNode = eventChain;
RuntimeException prevError = null;
while (chainNode != null) {
try {
chainNode.innerOnDispose(context, frame);
} catch (Throwable t) {
// no profiling necessary
prevError = chainNode.handleError(context, "onDispose", prevError, t);
}
chainNode = chainNode.next;
}
if (prevError != null) {
throw prevError;
}
}
private RuntimeException handleError(EventContext context, String eventName, RuntimeException previousError, Throwable newError) {
if (binding.isLanguageBinding()) {
if (previousError != null) {
profileBranch(SEEN_EXCEPTION_HAS_NEXT);
addSuppressedException(previousError, newError);
return previousError;
}
return (RuntimeException) newError;
} else {
if (newError instanceof InstrumentException) {
profileBranch(SEEN_EXCEPTION_INSTRUMENT);
if (((InstrumentException) newError).context == context) {
RuntimeException unwrapped = ((InstrumentException) newError).delegate;
if (previousError != null) {
profileBranch(SEEN_EXCEPTION_HAS_NEXT);
addSuppressedException(previousError, unwrapped);
return previousError;
}
return unwrapped;
}
}
profileBranch(SEEN_EXCEPTION_OTHER);
exceptionEventForClientInstrument(binding, eventName, newError);
}
return previousError;
}
@TruffleBoundary
private static void addSuppressedException(Throwable prev, Throwable t) {
prev.addSuppressed(t);
}
protected abstract void innerOnDispose(EventContext context, VirtualFrame frame);
@ExplodeLoop
static void onEnter(EventChainNode eventChain, EventContext context, VirtualFrame frame) {
EventChainNode current = eventChain;
UnwindException unwind = null;
RuntimeException prevError = null;
while (current != null) {
try {
current.innerOnEnter(context, frame);
} catch (UnwindException ex) {
current.profileBranch(SEEN_UNWIND_ON_ENTER);
unwind = handleUnwind(current, unwind, ex);
} catch (Throwable t) {
current.profileBranch(SEEN_EXCEPTION_ON_ENTER);
prevError = current.handleError(context, "onEnter", prevError, t);
}
current = current.next;
}
if (prevError != null) {
throw prevError;
}
if (unwind != null) {
throw unwind;
}
}
protected abstract void innerOnEnter(EventContext context, VirtualFrame frame);
@ExplodeLoop
static void onInputValue(EventChainNode eventChain, EventContext context, VirtualFrame frame, EventBinding inputBinding, EventContext inputContext, int inputIndex, Object inputValue) {
EventChainNode current = eventChain.getLast();
UnwindException unwind = null;
RuntimeException prevError = null;
while (current != null) {
try {
if (current.binding == inputBinding) {
current.innerOnInputValue(context, frame, current.binding, inputContext, inputIndex, inputValue);
}
} catch (UnwindException ex) {
current.profileBranch(SEEN_UNWIND_ON_INPUT_VALUE);
unwind = handleUnwind(current, unwind, ex);
} catch (Throwable t) {
current.profileBranch(SEEN_EXCEPTION_ON_INPUT_VALUE);
prevError = current.handleError(context, "onInputValue", prevError, t);
}
current = current.previous;
}
if (prevError != null) {
throw prevError;
}
if (unwind != null) {
throw unwind;
}
}
private static UnwindException handleUnwind(EventChainNode current, UnwindException unwind, UnwindException ex) {
ex.thrownFromBinding(current.binding);
return current.mergeUnwind(unwind, ex);
}
private UnwindException mergeUnwind(UnwindException unwind, UnwindException other) {
if (unwind != null && unwind != other) {
profileBranch(SEEN_UNWIND_HAS_NEXT);
unwind.addNext(other);
return unwind;
} else {
return other;
}
}
protected abstract void innerOnInputValue(EventContext context, VirtualFrame frame, EventBinding targetBinding, EventContext inputContext, int inputIndex, Object inputValue);
@ExplodeLoop
private EventChainNode getLast() {
EventChainNode current = this;
while (current.next != null) {
current = current.next;
}
CompilerAsserts.partialEvaluationConstant(current);
return current;
}
@ExplodeLoop
static void onReturnValue(EventChainNode chain, EventContext context, VirtualFrame frame, Object result) {
EventChainNode current = chain.getLast();
UnwindException unwind = null;
RuntimeException prevError = null;
while (current != null) {
try {
current.innerOnReturnValue(context, frame, result);
} catch (UnwindException ex) {
current.profileBranch(SEEN_UNWIND_ON_RETURN);
unwind = handleUnwind(current, unwind, ex);
} catch (Throwable t) {
current.profileBranch(SEEN_EXCEPTION_ON_RETURN);
prevError = current.handleError(context, "onInputValue", prevError, t);
}
current = current.previous;
}
if (prevError != null) {
throw prevError;
}
if (unwind != null) {
throw unwind;
}
}
protected abstract void innerOnReturnValue(EventContext context, VirtualFrame frame, Object result);
@ExplodeLoop
static void onReturnExceptional(EventChainNode chainNode, EventContext context, VirtualFrame frame, Throwable exception) {
UnwindException unwind = null;
EventChainNode current = chainNode.getLast();
RuntimeException prevError = null;
while (current != null) {
try {
current.innerOnReturnExceptional(context, frame, exception);
} catch (UnwindException ex) {
current.profileBranch(SEEN_UNWIND_ON_RETURN_EXCEPTIONAL);
unwind = handleUnwind(current, unwind, ex);
} catch (Throwable t) {
current.profileBranch(SEEN_EXCEPTION_ON_RETURN_EXCEPTIONAL);
prevError = current.handleError(context, "onInputValue", prevError, t);
}
current = current.previous;
}
if (prevError != null) {
throw prevError;
}
if (unwind != null) {
throw unwind;
}
}
protected abstract void innerOnReturnExceptional(EventContext context, VirtualFrame frame, Throwable exception);
private boolean containsBinding(UnwindException unwind) {
if (unwind.getBinding() == binding) {
return true;
} else {
UnwindException nextUnwind = unwind.getNext();
if (nextUnwind != null) {
profileBranch(SEEN_UNWIND_HAS_NEXT);
return containsBindingBoundary(nextUnwind);
} else {
return false;
}
}
}
@TruffleBoundary
private boolean containsBindingBoundary(UnwindException unwind) {
return containsBinding(unwind);
}
private Object getInfo(UnwindException unwind) {
if (unwind.getBinding() == binding) {
return unwind.getInfo();
} else {
UnwindException nextUnwind = unwind.getNext();
if (nextUnwind != null) {
profileBranch(SEEN_UNWIND_HAS_NEXT);
return getInfoBoundary(nextUnwind);
} else {
return false;
}
}
}
@TruffleBoundary
private Object getInfoBoundary(UnwindException unwind) {
return getInfo(unwind);
}
private void reset(UnwindException unwind) {
if (unwind.getBinding() == binding) {
unwind.resetThread();
} else {
UnwindException nextUnwind = unwind.getNext();
if (nextUnwind != null) {
profileBranch(SEEN_UNWIND_HAS_NEXT);
unwind.resetBoundary(binding);
}
}
}
@ExplodeLoop
static Object onUnwind(EventChainNode eventChain, EventContext context, VirtualFrame frame, UnwindException unwind) {
EventChainNode current = eventChain;
RuntimeException prevError = null;
Object ret = null;
while (current != null) {
Object nextRet = null;
if (current.containsBinding(unwind)) {
try {
nextRet = current.innerOnUnwind(context, frame, current.getInfo(unwind));
} catch (Throwable t) {
current.profileBranch(SEEN_EXCEPTION_ON_UNWIND);
prevError = current.handleError(context, "onUnwind", prevError, t);
}
if (nextRet != null) {
assert checkInteropType(nextRet, current.binding);
current.reset(unwind);
}
} else {
nextRet = UNWIND_ACTION_IGNORED;
}
if (current == eventChain) {
// first event chain
ret = nextRet;
} else {
ret = mergePostUnwindReturns(ret, nextRet);
}
current = current.next;
}
if (prevError != null) {
throw prevError;
}
return ret;
}
protected abstract Object innerOnUnwind(EventContext context, VirtualFrame frame, Object info);
EventChainNode find(EventBinding b) {
if (binding == b) {
assert next == null || next.find(b) == null : "only one chain entry per binding allowed";
return this;
}
return next != null ? next.find(b) : null;
}
}
private static class EventFilterChainNode extends ProbeNode.EventChainNode {
private final ExecutionEventListener listener;
EventFilterChainNode(EventBinding.Source binding, ExecutionEventListener listener) {
super(binding);
this.listener = listener;
}
@Override
protected void innerOnInputValue(EventContext context, VirtualFrame frame, EventBinding binding, EventContext inputContext, int inputIndex, Object inputValue) {
}
@Override
protected void innerOnEnter(EventContext context, VirtualFrame frame) {
listener.onEnter(context, frame);
}
@Override
protected void innerOnReturnExceptional(EventContext context, VirtualFrame frame, Throwable exception) {
listener.onReturnExceptional(context, frame, exception);
}
@Override
protected void innerOnReturnValue(EventContext context, VirtualFrame frame, Object result) {
listener.onReturnValue(context, frame, result);
}
@Override
protected Object innerOnUnwind(EventContext context, VirtualFrame frame, Object info) {
return listener.onUnwind(context, frame, info);
}
@Override
protected void innerOnDispose(EventContext context, VirtualFrame frame) {
}
}
static class EventProviderWithInputChainNode extends EventProviderChainNode {
static final Object[] EMPTY_ARRAY = new Object[0];
@CompilationFinal(dimensions = 1) private volatile FrameSlot[] inputSlots;
@CompilationFinal private volatile FrameDescriptor sourceFrameDescriptor;
final int inputBaseIndex;
final int inputCount;
@CompilationFinal(dimensions = 1) volatile EventContext[] inputContexts;
EventProviderWithInputChainNode(EventBinding.Source binding, ExecutionEventNode eventNode, int inputBaseIndex, int inputCount) {
super(binding, eventNode);
this.inputBaseIndex = inputBaseIndex;
this.inputCount = inputCount;
}
final int getInputCount() {
return inputCount;
}
final EventContext getInputContext(int index) {
EventContext[] contexts = inputContexts;
if (contexts == null) {
CompilerDirectives.transferToInterpreterAndInvalidate();
ProbeNode probe = findProbe();
EventContext thisContext = probe.context;
RootNode rootNode = getRootNode();
Set> providedTags = probe.handler.getProvidedTags(rootNode);
inputContexts = contexts = findChildContexts(getBinding(), rootNode, providedTags, thisContext.getInstrumentedNode(), thisContext.getInstrumentedSourceSection(), inputCount);
}
if (contexts == null) {
CompilerDirectives.transferToInterpreterAndInvalidate();
throw new IllegalStateException("Input event context not yet available. They are only available during event notifications.");
}
return contexts[index];
}
final void saveInputValue(VirtualFrame frame, int inputIndex, Object value) {
verifyIndex(inputIndex);
if (inputSlots == null) {
CompilerDirectives.transferToInterpreterAndInvalidate();
initializeSlots(frame);
}
assert sourceFrameDescriptor == frame.getFrameDescriptor() : "Unstable frame descriptor used by the language.";
frame.setObject(inputSlots[inputIndex], value);
}
private void initializeSlots(VirtualFrame frame) {
Lock lock = getLock();
lock.lock();
try {
if (this.inputSlots == null) {
if (InstrumentationHandler.TRACE) {
InstrumentationHandler.trace("SLOTS: Adding %s save slots for binding %s%n", inputCount, getBinding().getElement());
}
FrameDescriptor frameDescriptor = frame.getFrameDescriptor();
FrameSlot[] slots = new FrameSlot[inputCount];
for (int i = 0; i < inputCount; i++) {
int slotIndex = inputBaseIndex + i;
slots[i] = frameDescriptor.findOrAddFrameSlot(new SavedInputValueID(getBinding(), slotIndex));
}
this.sourceFrameDescriptor = frameDescriptor;
this.inputSlots = slots;
}
} finally {
lock.unlock();
}
}
private void verifyIndex(int inputIndex) {
if (inputIndex >= inputCount || inputIndex < 0) {
CompilerDirectives.transferToInterpreter();
throw new IllegalArgumentException("Invalid input index.");
}
}
@Override
protected void innerOnDispose(EventContext context, VirtualFrame frame) {
Lock lock = getLock();
lock.lock();
try {
if (inputSlots != null) {
FrameSlot[] slots = inputSlots;
inputSlots = null;
RootNode rootNode = context.getInstrumentedNode().getRootNode();
if (rootNode == null) {
return;
}
FrameDescriptor descriptor = rootNode.getFrameDescriptor();
assert descriptor != null;
for (FrameSlot slot : slots) {
FrameSlot resolvedSlot = descriptor.findFrameSlot(slot.getIdentifier());
if (resolvedSlot != null) {
descriptor.removeFrameSlot(slot.getIdentifier());
} else {
// slot might be shared and already removed by another event provider
// node.
}
}
}
} finally {
lock.unlock();
}
super.innerOnDispose(context, frame);
}
@Override
protected void innerOnReturnExceptional(EventContext context, VirtualFrame frame, Throwable exception) {
super.innerOnReturnExceptional(context, frame, exception);
clearSlots(frame);
}
@Override
protected void innerOnReturnValue(EventContext context, VirtualFrame frame, Object result) {
super.innerOnReturnValue(context, frame, result);
clearSlots(frame);
}
@ExplodeLoop
private void clearSlots(VirtualFrame frame) {
FrameSlot[] slots = inputSlots;
if (slots != null) {
if (frame.getFrameDescriptor() == sourceFrameDescriptor) {
for (int i = 0; i < slots.length; i++) {
frame.setObject(slots[i], null);
}
}
}
}
protected final Object getSavedInputValue(VirtualFrame frame, int inputIndex) {
try {
verifyIndex(inputIndex);
if (inputSlots == null) {
// never saved any value
return null;
}
return frame.getObject(inputSlots[inputIndex]);
} catch (FrameSlotTypeException e) {
CompilerDirectives.transferToInterpreter();
throw new AssertionError(e);
}
}
@ExplodeLoop
protected final Object[] getSavedInputValues(VirtualFrame frame) {
FrameSlot[] slots = inputSlots;
if (slots == null) {
return EMPTY_ARRAY;
}
Object[] inputValues;
if (frame.getFrameDescriptor() == sourceFrameDescriptor) {
inputValues = new Object[slots.length];
for (int i = 0; i < slots.length; i++) {
try {
inputValues[i] = frame.getObject(slots[i]);
} catch (FrameSlotTypeException e) {
CompilerDirectives.transferToInterpreter();
throw new AssertionError(e);
}
}
} else {
inputValues = new Object[inputSlots.length];
}
return inputValues;
}
static final class SavedInputValueID {
private final EventBinding binding;
private final int index;
SavedInputValueID(EventBinding binding, int index) {
this.binding = binding;
this.index = index;
}
@Override
public int hashCode() {
return (31 * binding.hashCode()) * 31 + index;
}
@Override
public String toString() {
return "SavedInputValue(binding=" + binding.hashCode() + ":" + index + ")";
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
} else if (obj == null || getClass() != obj.getClass()) {
return false;
}
SavedInputValueID other = (SavedInputValueID) obj;
return binding == other.binding && index == other.index;
}
}
}
static class EventProviderChainNode extends ProbeNode.EventChainNode {
@Child private ExecutionEventNode eventNode;
EventProviderChainNode(EventBinding.Source binding, ExecutionEventNode eventNode) {
super(binding);
this.eventNode = eventNode;
}
@Override
protected final void innerOnInputValue(EventContext context, VirtualFrame frame, EventBinding binding, EventContext inputContext, int inputIndex, Object inputValue) {
eventNode.onInputValue(frame, inputContext, inputIndex, inputValue);
}
@Override
protected final void innerOnEnter(EventContext context, VirtualFrame frame) {
eventNode.onEnter(frame);
}
@Override
protected void innerOnReturnExceptional(EventContext context, VirtualFrame frame, Throwable exception) {
eventNode.onReturnExceptional(frame, exception);
}
@Override
protected void innerOnReturnValue(EventContext context, VirtualFrame frame, Object result) {
eventNode.onReturnValue(frame, result);
}
@Override
protected Object innerOnUnwind(EventContext context, VirtualFrame frame, Object info) {
return eventNode.onUnwind(frame, info);
}
@Override
protected void innerOnDispose(EventContext context, VirtualFrame frame) {
eventNode.onDispose(frame);
}
}
private static class InputValueChainNode extends ProbeNode.EventChainNode {
private final EventBinding targetBinding;
private final ProbeNode parentProbe;
private final int inputIndex;
private final EventContext inputContext;
InputValueChainNode(EventBinding.Source binding, ProbeNode parentProbe, EventContext inputContext, int inputIndex) {
super(binding);
this.targetBinding = binding;
this.parentProbe = parentProbe;
this.inputContext = inputContext;
this.inputIndex = inputIndex;
}
@Override
EventChainNode find(EventBinding b) {
EventChainNode next = getNext();
if (next == null) {
return null;
} else {
return next.find(b);
}
}
@Override
protected Object innerOnUnwind(EventContext context, VirtualFrame frame, Object info) {
return UNWIND_ACTION_IGNORED;
}
@Override
@SuppressWarnings("hiding")
protected void innerOnInputValue(EventContext context, VirtualFrame frame, EventBinding binding, EventContext inputContext, int inputIndex, Object inputValue) {
}
@Override
protected void innerOnEnter(EventContext context, VirtualFrame frame) {
}
@Override
protected void innerOnDispose(EventContext context, VirtualFrame frame) {
}
@Override
protected void innerOnReturnValue(EventContext context, VirtualFrame frame, Object result) {
parentProbe.onInputValue(frame, targetBinding, inputContext, inputIndex, result);
}
@Override
protected void innerOnReturnExceptional(EventContext context, VirtualFrame frame, Throwable exception) {
}
}
}