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package com.oracle.truffle.api.instrumentation;
import java.lang.ref.Reference;
import java.lang.ref.WeakReference;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.function.Consumer;
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.TruffleLanguage;
import com.oracle.truffle.api.TruffleLanguage.Env;
import com.oracle.truffle.api.nodes.ExplodeLoop;
import com.oracle.truffle.api.nodes.LanguageInfo;
/**
* Reporter of guest language value allocations. Language implementation ought to use this class to
* report all allocations and re-allocations of guest language values. An instance of this class can
* be obtained from {@link Env#lookup(java.lang.Class) Env.lookup(AllocationReporter.class)}. If
* used from compiled code paths, then the allocation reporter must be stored in a compilation final
* or final field.
*
* Usage example: {@link AllocationReporterSnippets#example}
*
* @since 0.27
*/
public final class AllocationReporter {
/**
* Constant specifying an unknown size. Use it when it's not possible to estimate size of the
* memory being allocated.
*
* @since 0.27
*/
public static final long SIZE_UNKNOWN = Long.MIN_VALUE;
final LanguageInfo language;
private final List> activeListeners = new CopyOnWriteArrayList<>();
private final ThreadLocal>> valueCheck;
@CompilationFinal private volatile Assumption listenersNotChangedAssumption = Truffle.getRuntime().createAssumption();
@CompilationFinal(dimensions = 1) private volatile AllocationListener[] listeners = null;
AllocationReporter(LanguageInfo language) {
this.language = language;
boolean assertions = false;
assert (assertions = true) == true;
valueCheck = (assertions) ? new ThreadLocal<>() : null;
}
/**
* Add a listener that is notified when {@link #isActive() active} value of this reporter
* changes. The listener {@link Consumer#accept(Object) accept} method is called with the new
* value of {@link #isActive()}.
*
* @since 19.0
*/
public void addActiveListener(Consumer listener) {
activeListeners.add(listener);
}
/**
* Remove a listener that is notified when {@link #isActive() active} value of this reporter
* changes.
*
* @since 19.0
*/
public void removeActiveListener(Consumer listener) {
activeListeners.remove(listener);
}
/**
* Test if the reporter instance is actually doing some reporting when notify methods are
* called. Methods {@link #onEnter(java.lang.Object, long, long)} and
* {@link #onReturnValue(java.lang.Object, long, long)} have no effect when this method returns
* false. A listener can be {@link #addActiveListener(Consumer) added} to listen on changes of
* this value.
*
* @return true when there are some {@link AllocationListener}s attached,
* false otherwise.
* @since 0.27
*/
public boolean isActive() {
if (!listenersNotChangedAssumption.isValid()) {
CompilerDirectives.transferToInterpreterAndInvalidate();
}
return listeners != null;
}
void addListener(AllocationListener l) {
CompilerAsserts.neverPartOfCompilation();
boolean hadListeners;
synchronized (this) {
if (listeners == null) {
listeners = new AllocationListener[]{l};
hadListeners = false;
} else {
int index = listeners.length;
AllocationListener[] newListeners = Arrays.copyOf(listeners, index + 1);
newListeners[index] = l;
listeners = newListeners;
hadListeners = true;
}
Assumption assumption = listenersNotChangedAssumption;
listenersNotChangedAssumption = Truffle.getRuntime().createAssumption();
assumption.invalidate();
}
if (!hadListeners) {
for (Consumer listener : activeListeners) {
listener.accept(true);
}
}
}
void removeListener(AllocationListener l) {
CompilerAsserts.neverPartOfCompilation();
boolean hasListeners = true;
synchronized (this) {
final int len = listeners.length;
if (len == 1) {
if (listeners[0] == l) {
listeners = null;
hasListeners = false;
}
} else {
for (int i = 0; i < len; i++) {
if (listeners[i] == l) {
if (i == (len - 1)) {
listeners = Arrays.copyOf(listeners, i);
} else if (i == 0) {
listeners = Arrays.copyOfRange(listeners, 1, len);
} else {
AllocationListener[] newListeners = new AllocationListener[len - 1];
System.arraycopy(listeners, 0, newListeners, 0, i);
System.arraycopy(listeners, i + 1, newListeners, i, len - i - 1);
listeners = newListeners;
}
break;
}
}
}
Assumption assumption = listenersNotChangedAssumption;
listenersNotChangedAssumption = Truffle.getRuntime().createAssumption();
assumption.invalidate();
}
if (!hasListeners) {
for (Consumer listener : activeListeners) {
listener.accept(false);
}
}
}
/**
* Report an intent to allocate a new guest language value, or re-allocate an existing one. This
* method delegates to all registered listeners
* {@link AllocationListener#onEnter(com.oracle.truffle.api.instrumentation.AllocationEvent)}.
* Only primitive types, String and {@link com.oracle.truffle.api.interop.TruffleObject} are
* accepted value types. The change in memory consumption caused by the allocation is going to
* be newSizeEstimate - oldSize when both old size and new size are known. The
* change can be either positive or negative.
*
* A call to this method needs to be followed by a call to
* {@link #onReturnValue(java.lang.Object, long, long)} with the actual allocated value, or with
* the same (re-allocated) value. Nested allocations are supported, several calls to
* onEnter prior every sub-value allocation can be followed by the appropriate
* number of onReturnValue calls after the sub-values are allocated, in the
* opposite order.
*
* @param valueToReallocate null in case of a new allocation, or the value that is
* to be re-allocated.
* @param oldSize 0 in case of a new allocation, or the size in bytes of value to
* be re-allocated. Can be {@link #SIZE_UNKNOWN} when the value size is not known.
* @param newSizeEstimate an estimate of the allocation size of the value which is to be created
* or re-allocated, in bytes. Can be {@link #SIZE_UNKNOWN} when the allocation size
* is not known.
* @since 0.27
*/
public void onEnter(Object valueToReallocate, long oldSize, long newSizeEstimate) {
if (valueCheck != null) {
onEnterCheck(valueToReallocate, oldSize, newSizeEstimate);
}
notifyAllocateOrReallocate(valueToReallocate, oldSize, newSizeEstimate);
}
@TruffleBoundary
private void onEnterCheck(Object valueToReallocate, long oldSize, long newSizeEstimate) {
enterSizeCheck(valueToReallocate, oldSize, newSizeEstimate);
if (valueToReallocate != null) {
allocateValueCheck(valueToReallocate);
}
setValueCheck(valueToReallocate);
}
@ExplodeLoop
private void notifyAllocateOrReallocate(Object value, long oldSize, long newSizeEstimate) {
CompilerAsserts.partialEvaluationConstant(this);
if (!listenersNotChangedAssumption.isValid()) {
CompilerDirectives.transferToInterpreterAndInvalidate();
}
AllocationListener[] ls = this.listeners;
if (ls != null) {
AllocationEvent event = new AllocationEvent(language, value, oldSize, newSizeEstimate);
for (AllocationListener l : ls) {
l.onEnter(event);
}
}
}
/**
* Report an allocation of a new one or re-allocation of an existing guest language value. This
* method notifies all registered listeners
* {@link AllocationListener#onReturnValue(com.oracle.truffle.api.instrumentation.AllocationEvent)}
* . Only primitive types, String and {@link com.oracle.truffle.api.interop.TruffleObject} are
* accepted value types. The change in memory consumption caused by the allocation is
* newSize - oldSize when both old size and new size are known. The change can be
* either positive or negative.
*
* A call to {@link #onEnter(java.lang.Object, long, long)} must precede this call. In case of
* re-allocation, the value object passed to {@link #onEnter(java.lang.Object, long, long)} must
* be the same instance as the value passed to this method.
*
* @param value the value that was newly allocated, or the re-allocated value. Must not be
* null.
* @param oldSize size in bytes of an old value, if any. Must be 0 for newly
* allocated values. In case of re-allocation it's the size of the original value
* before re-allocation. Can be {@link #SIZE_UNKNOWN} when not known.
* @param newSize the size of the allocated value in bytes. In case of re-allocation, it's the
* size of the object after re-allocation. The newSize may be less than
* oldSize when the object size shrinks. Can be {@link #SIZE_UNKNOWN}
* when not known.
* @since 0.27
*/
public void onReturnValue(Object value, long oldSize, long newSize) {
if (valueCheck != null) {
onReturnValueCheck(value, oldSize, newSize);
}
notifyAllocated(value, oldSize, newSize);
}
@TruffleBoundary
private void onReturnValueCheck(Object value, long oldSize, long newSize) {
allocateValueCheck(value);
allocatedCheck(value, oldSize, newSize);
}
@ExplodeLoop
private void notifyAllocated(Object value, long oldSize, long newSize) {
CompilerAsserts.partialEvaluationConstant(this);
if (!listenersNotChangedAssumption.isValid()) {
CompilerDirectives.transferToInterpreterAndInvalidate();
}
AllocationListener[] ls = this.listeners;
if (ls != null) {
AllocationEvent event = new AllocationEvent(language, value, oldSize, newSize);
for (AllocationListener l : ls) {
l.onReturnValue(event);
}
}
}
private static void enterSizeCheck(Object valueToReallocate, long oldSize, long newSizeEstimate) {
CompilerAsserts.neverPartOfCompilation();
assert (newSizeEstimate == SIZE_UNKNOWN || newSizeEstimate > 0) : "Wrong new size estimate = " + newSizeEstimate;
assert valueToReallocate != null || oldSize == 0 : "Old size must be 0 for new allocations. Was: " + oldSize;
assert valueToReallocate == null || (oldSize > 0 || oldSize == SIZE_UNKNOWN) : "Old size of a re-allocated value must be positive or unknown. Was: " + oldSize;
}
private boolean setValueCheck(Object value) {
CompilerAsserts.neverPartOfCompilation();
LinkedList> list = valueCheck.get();
if (list == null) {
list = new LinkedList<>();
valueCheck.set(list);
}
list.add(new WeakReference<>(value));
return true;
}
private static void allocateValueCheck(Object value) {
CompilerAsserts.neverPartOfCompilation();
if (value == null) {
throw new NullPointerException("No allocated value.");
}
// Strings are O.K.
if (value instanceof String) {
return;
}
// Primitive types are O.K.
if (value instanceof Boolean || value instanceof Byte || value instanceof Character ||
value instanceof Short || value instanceof Integer || value instanceof Long ||
value instanceof Float || value instanceof Double) {
return;
}
// TruffleObject is O.K.
boolean isTO = InstrumentAccessor.ACCESSOR.isTruffleObject(value);
assert isTO : "Wrong value class, TruffleObject is required. Was: " + value.getClass().getName();
}
private void allocatedCheck(Object value, long oldSize, long newSize) {
CompilerAsserts.neverPartOfCompilation();
assert value != null : "Allocated value must not be null.";
LinkedList> list = valueCheck.get();
assert list != null && !list.isEmpty() : "onEnter() was not called";
Object orig = list.removeLast().get();
assert orig == null || orig == value : "A different reallocated value. Was: " + orig + " now is: " + value;
assert orig == null && oldSize == 0 || orig != null : "Old size must be 0 for new allocations. Was: " + oldSize;
assert orig != null && (oldSize > 0 || oldSize == SIZE_UNKNOWN) || orig == null : "Old size of a re-allocated value must be positive or unknown. Was: " + oldSize;
assert newSize == SIZE_UNKNOWN || newSize > 0 : "New value size must be positive or unknown. Was: " + newSize;
}
}
class AllocationReporterSnippets extends TruffleLanguage {
void example() {
}
static ContextObject getCurrentContext() {
return getCurrentContext(AllocationReporterSnippets.class);
}
// @formatter:off
// BEGIN: AllocationReporterSnippets#example
@Override
protected ContextObject createContext(Env env) {
AllocationReporter reporter = env.lookup(AllocationReporter.class);
return new ContextObject(reporter);
}
Object allocateNew() {
AllocationReporter reporter = getCurrentContext().getReporter();
// Test if the reporter is active, we should compute the size estimate
if (reporter.isActive()) {
long size = findSizeEstimate();
reporter.onEnter(null, 0, size);
}
// Do the allocation itself
Object newObject = new MyTruffleObject();
// Test if the reporter is active,
// we should compute the allocated object size
if (reporter.isActive()) {
long size = findSize(newObject);
reporter.onReturnValue(newObject, 0, size);
}
return newObject;
}
Object allocateComplex() {
AllocationReporter reporter = getCurrentContext().getReporter();
// If the allocated size is a constant, onEnter() and onReturnValue()
// can be called without a fast-path performance penalty when not active
reporter.onEnter(null, 0, 16);
// Do the allocation itself
Object newObject = createComplexObject();
// Report the allocation
reporter.onReturnValue(newObject, 0, 16);
return newObject;
}
// END: AllocationReporterSnippets#example
// @formatter:on
private static long findSizeEstimate() {
return 0L;
}
private static long findSize(Object newObject) {
assert newObject != null;
return 0L;
}
private static Object createComplexObject() {
return null;
}
private static class MyTruffleObject {
}
}
class ContextObject {
private final AllocationReporter reporter;
ContextObject(AllocationReporter reporter) {
this.reporter = reporter;
}
public AllocationReporter getReporter() {
return reporter;
}
}