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package com.oracle.truffle.api.dsl;
import java.io.File;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.ref.WeakReference;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.BitSet;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.IntSummaryStatistics;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
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.nodes.ExplodeLoop;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.source.SourceSection;
/**
* Represents a specialization statistics utiltiy that can be {@link #enter() entered} to collect
* additional statistics about Truffle DSL nodes. In order for the statistics to be useful the nodes
* need to be regenerated using the -Atruffle.dsl.GenerateSpecializationStatistics=true
* flag or using the {@link AlwaysEnabled} annotation.
*
* The easiest way to use this utility is to enable the
* --engine.SpecializationStatistics polyglot option. This should print the histogram
* when the engine is closed.
*
* See also the usage
* tutorial on the website.
*
* @since 20.3
*/
public final class SpecializationStatistics {
private static final ThreadLocal STATISTICS = new ThreadLocal<>();
private final Map, NodeClassStatistics> classStatistics = new HashMap<>();
private final Map uncachedStatistics = new HashMap<>();
SpecializationStatistics() {
}
/**
* Returns true if the statistics did collect any data, else false.
*
* @since 20.3
*/
public synchronized boolean hasData() {
for (NodeClassStatistics classStatistic : classStatistics.values()) {
if (classStatistic.createHistogram().getNodeStat().getSum() > 0) {
return true;
}
}
return false;
}
/**
* Prints the specialization histogram to the provided writer. Does not print anything if no
* {@link #hasData() data} was collected.
*
* @see #printHistogram(PrintWriter)
* @since 20.3
*/
public synchronized void printHistogram(PrintWriter writer) {
List histograms = new ArrayList<>();
long parentSum = 0;
long parentCount = 0;
for (NodeClassStatistics classStatistic : classStatistics.values()) {
NodeClassHistogram histogram = classStatistic.createHistogram();
histograms.add(histogram);
parentSum += histogram.getNodeStat().getSum();
parentCount += histogram.getNodeStat().getCount();
}
Collections.sort(histograms, new Comparator() {
public int compare(NodeClassHistogram o1, NodeClassHistogram o2) {
return Long.compare(o1.getNodeStat().getSum(), o2.getNodeStat().getSum());
}
});
int width = 0;
for (NodeClassHistogram histogram : histograms) {
if (histogram.getNodeStat().getSum() == 0) {
continue;
}
width = Math.max(histogram.getLabelWidth(), width);
}
width = Math.min(width, 80);
NodeClassHistogram.printLine(writer, " ", width);
for (NodeClassHistogram histogram : histograms) {
if (histogram.getNodeStat().getSum() == 0) {
continue;
}
histogram.print(writer, width, parentCount, parentSum);
}
}
/**
* Prints the specialization histogram to the provided stream. Does not print anything if no
* {@link #hasData() data} was collected.
*
* @see #printHistogram(PrintWriter)
* @since 20.3
*/
public synchronized void printHistogram(PrintStream stream) {
printHistogram(new PrintWriter(stream));
}
/**
* Creates a new specialization statistics instance. Note specialization statistics need to be
* {@link #enter() entered} to collect data on a thread.
*
* @since 20.3
*/
public static SpecializationStatistics create() {
return new SpecializationStatistics();
}
private synchronized NodeStatistics createCachedNodeStatistic(Node node, String[] specializations) {
NodeClassStatistics classStatistic = getClassStatistics(node.getClass(), specializations);
EnabledNodeStatistics stat = new EnabledNodeStatistics(node, classStatistic);
classStatistic.statistics.add(stat);
if (classStatistic.nodeCounter++ % 1024 == 0) {
/*
* In order to not crash for code load benchmarks we need to process collected nodes
* from time to time to clean them up.
*/
classStatistic.processCollectedStatistics();
}
return stat;
}
private NodeClassStatistics getClassStatistics(Class nodeClass, String[] specializations) {
assert Thread.holdsLock(this);
return this.classStatistics.computeIfAbsent(nodeClass, (c) -> new NodeClassStatistics(c, specializations));
}
private static NodeStatistics createUncachedNodeStatistic(Node node, String[] specializations) {
return new UncachedNodeStatistics(node, specializations);
}
/**
* Enters this specialization instance object on the current thread. After entering a
* specialization statistics instance will gather statistics for all nodes with
* {@link Specialization specializations} that were created on this entered thread. Multiple
* threads may be entered at the same time. The caller must make sure to
* {@link #leave(SpecializationStatistics)} the current statistics after entering in all cases.
*
* @since 20.3
*/
@TruffleBoundary
public SpecializationStatistics enter() {
SpecializationStatistics prev = STATISTICS.get();
STATISTICS.set(this);
return prev;
}
/**
* Leaves the currently {@link #enter() entered} entered statistics. It is required to leave a
* statistics block after it was entered. It is recommended to use a finally block for this
* purpose.
*
* @since 20.3
*/
@SuppressWarnings("static-method")
@TruffleBoundary
public void leave(SpecializationStatistics prev) {
STATISTICS.set(prev);
}
/**
* Used on nodes to always enable specialization statistics. The Truffle DSL processor will not
* generate statistics code unless the
* -J-Dtruffle.dsl.GenerateSpecializationStatistics=true javac system property is
* set. This annotation can be used to annotate node types that want to force enable the
* statistics independent of the system property. This annotation is inherited by sub classes.
*
* @since 20.3
*/
@Retention(RetentionPolicy.CLASS)
@Target({ElementType.TYPE})
public @interface AlwaysEnabled {
}
static final class NodeClassStatistics {
private List statistics = new ArrayList<>();
/*
* Combines data from all collected nodes.
*/
private final NodeClassHistogram collectedHistogram;
private int nodeCounter;
NodeClassStatistics(Class nodeClass, String[] specializations) {
this.collectedHistogram = new NodeClassHistogram(nodeClass, specializations);
}
private void processCollectedStatistics() {
boolean found = false;
/*
* Most calls to processStatistics don't actually need to remove anything. But if
* something is removed it is typically more than one entry, so we do a first pass over
* the references to find out whether there is a removed node and then recreate the
* entire list.
*/
for (EnabledNodeStatistics statistic : this.statistics) {
if (statistic.isCollected()) {
found = true;
break;
}
}
if (found) {
List newStatistics = new ArrayList<>();
for (EnabledNodeStatistics statistic : this.statistics) {
if (statistic.isCollected()) {
collectedHistogram.accept(statistic);
} else {
newStatistics.add(statistic);
}
}
statistics = newStatistics;
}
}
public NodeClassHistogram createHistogram() {
NodeClassHistogram h = new NodeClassHistogram(collectedHistogram.getNodeClass(), collectedHistogram.getSpecializationNames());
h.combine(this.collectedHistogram);
for (EnabledNodeStatistics stat : statistics) {
h.accept(stat);
}
return h;
}
}
static final class IntStatistics extends IntSummaryStatistics {
private SourceSection maxSourceSection;
@Override
@Deprecated(since = "20.3")
public void accept(int value) {
throw new UnsupportedOperationException();
}
public void accept(int value, SourceSection sourceSection) {
if (value > getMax()) {
this.maxSourceSection = sourceSection;
}
super.accept(value);
}
public void combine(IntStatistics other) {
if (other.getMax() > this.getMax()) {
this.maxSourceSection = other.maxSourceSection;
}
super.combine(other);
}
@Override
@Deprecated(since = "20.3")
public void combine(IntSummaryStatistics other) {
throw new UnsupportedOperationException();
}
}
static final class NodeClassHistogram {
private final Class nodeClass;
private final String[] specializationNames;
private final IntStatistics nodeStat;
private final IntStatistics[] specializationStat;
private final List> typeCombinationStat;
private final Map specializationCombinationStat;
private final Map specializationCombinationSumStat;
@SuppressWarnings("unchecked")
NodeClassHistogram(Class nodeClass, String[] specializationNames) {
this.nodeClass = nodeClass;
this.specializationNames = specializationNames;
this.typeCombinationStat = new ArrayList<>(specializationNames.length);
this.specializationStat = new IntStatistics[specializationNames.length];
this.nodeStat = new IntStatistics();
for (int i = 0; i < specializationNames.length; i++) {
typeCombinationStat.add(new LinkedHashMap<>());
specializationStat[i] = new IntStatistics();
}
this.specializationCombinationStat = new HashMap<>();
this.specializationCombinationSumStat = new HashMap<>();
}
Class getNodeClass() {
return nodeClass;
}
String[] getSpecializationNames() {
return specializationNames;
}
IntStatistics getNodeStat() {
return nodeStat;
}
void accept(EnabledNodeStatistics statistics) {
int nodeSum = 0;
SourceSection sourceSection = statistics.getSourceSection();
BitSet enabledBitSet = new BitSet();
for (int i = 0; i < statistics.specializations.length; i++) {
TypeCombination combination = statistics.specializations[i];
int specializationSum = 0;
while (combination != null) {
int count = combination.executionCount;
IntStatistics typeCombination = this.typeCombinationStat.get(i).computeIfAbsent(combination, (c) -> new IntStatistics());
typeCombination.accept(count, sourceSection);
combination = combination.next;
specializationSum += count;
}
nodeSum += specializationSum;
if (specializationSum != 0) {
enabledBitSet.set(i);
specializationStat[i].accept(specializationSum, sourceSection);
}
}
if (nodeSum == 0) {
// not actually executed
return;
}
IntStatistics combinationSumStat = specializationCombinationSumStat.computeIfAbsent(enabledBitSet, (b) -> new IntStatistics());
IntStatistics[] combinationSpecializations = specializationCombinationStat.computeIfAbsent(enabledBitSet, (b) -> new IntStatistics[specializationNames.length]);
int combinationSum = 0;
for (int i = 0; i < statistics.specializations.length; i++) {
TypeCombination combination = statistics.specializations[i];
int specializationSum = 0;
while (combination != null) {
specializationSum += combination.executionCount;
combination = combination.next;
}
if (specializationSum != 0) {
combinationSum += specializationSum;
if (combinationSpecializations[i] == null) {
combinationSpecializations[i] = new IntStatistics();
}
combinationSpecializations[i].accept(specializationSum, sourceSection);
}
}
combinationSumStat.accept(combinationSum, sourceSection);
if (nodeSum != 0) {
nodeStat.accept(nodeSum, sourceSection);
}
}
void combine(NodeClassHistogram nodeClassStatistics) {
for (int i = 0; i < typeCombinationStat.size(); i++) {
Map statistics = nodeClassStatistics.typeCombinationStat.get(i);
for (Entry executionStat : statistics.entrySet()) {
this.typeCombinationStat.get(i).computeIfAbsent(executionStat.getKey(), (c) -> new IntStatistics()).combine(executionStat.getValue());
}
for (int j = 0; j < specializationStat.length; j++) {
specializationStat[j].combine(nodeClassStatistics.specializationStat[i]);
}
nodeStat.combine(nodeClassStatistics.nodeStat);
}
}
void print(PrintWriter stream, int width, long parentCount, long parentSum) {
// we need 6 more characters to fit the maximum indent
if (nodeStat.getCount() == 0) {
return;
}
stream.printf("| %-" + width + "s Instances Executions Executions per instance %n", "Name");
printLine(stream, " ", width);
String className = getDisplayName();
printStats(stream, "| ", className, width, nodeStat, parentCount, parentSum);
for (int i = 0; i < specializationNames.length; i++) {
int size = typeCombinationStat.get(i).size();
String specializationLabel = specializationNames[i];
if (size == 1) {
specializationLabel += " " + typeCombinationStat.get(i).keySet().iterator().next().getDisplayName();
}
printStats(stream, "| ", specializationLabel, width, specializationStat[i], nodeStat.getCount(), nodeStat.getSum());
if (size > 1) {
for (Entry entry : typeCombinationStat.get(i).entrySet()) {
printStats(stream, "| ", entry.getKey().getDisplayName(), width, entry.getValue(), specializationStat[i].getCount(), specializationStat[i].getSum());
}
}
}
printLine(stream, "| ", width);
Set printedCombinations = new HashSet<>();
for (int specialization = 0; specialization < specializationNames.length; specialization++) {
for (BitSet specializations : specializationCombinationStat.keySet()) {
if (printedCombinations.contains(specializations)) {
continue;
}
// trying to order them by index. First print all combinations with the first
// specialization then all with the second and so on.
if (!specializations.get(specialization)) {
continue;
}
IntStatistics statistics = specializationCombinationSumStat.get(specializations);
IntStatistics[] specializationStatistics = specializationCombinationStat.get(specializations);
int specializationIndex = 0;
StringBuilder label = new StringBuilder("[");
String sep = "";
int bits = 0;
while ((specializationIndex = specializations.nextSetBit(specializationIndex)) != -1) {
label.append(sep);
label.append(specializationNames[specializationIndex]);
sep = ", ";
specializationIndex++; // exclude previous bit.
bits++;
}
label.append("]");
printStats(stream, "| ", label.toString(), width, statistics, nodeStat.getCount(), nodeStat.getSum());
if (bits > 1) {
specializationIndex = 0;
while ((specializationIndex = specializations.nextSetBit(specializationIndex)) != -1) {
printStats(stream, "| ", specializationNames[specializationIndex], width, specializationStatistics[specializationIndex], statistics.getCount(), statistics.getSum());
specializationIndex++; // exclude previous bit.
}
}
printedCombinations.add(specializations);
}
}
printLine(stream, " ", width);
}
static void printLine(PrintWriter stream, String indent, int width) {
stream.print(indent);
for (int i = 0; i < width + 100 - indent.length(); i++) {
stream.print('-');
}
stream.print(System.lineSeparator());
}
private String getDisplayName() {
String className = nodeClass.getSimpleName();
if (className.equals("Uncached")) {
Class enclosing = nodeClass.getEnclosingClass();
if (enclosing != null) {
className = enclosing.getSimpleName() + "." + className;
}
}
return className;
}
private int getLabelWidth() {
int width = 0;
width = Math.max(getDisplayName().length(), width);
for (String name : specializationNames) {
width = Math.max(name.length(), width);
}
for (Map executionStat : typeCombinationStat) {
for (TypeCombination combination : executionStat.keySet()) {
width = Math.max(combination.getDisplayName().length(), width);
}
}
return width;
}
private static void printStats(PrintWriter stream, String indent, String label, int labelWidth, IntStatistics nodeStats, long parentCount, long parentSum) {
String countPercent = String.format("(%.0f%%)", ((double) nodeStats.getCount() / (double) parentCount) * 100);
String sumPercent = String.format("(%.0f%%)", ((double) nodeStats.getSum() / (double) parentSum) * 100);
stream.printf("%s%-" + labelWidth + "s %8d %-6s %12d %-6s Min=%10d Avg=%12.2f Max= %10d MaxNode= %s %n",
indent, label,
nodeStats.getCount(), countPercent,
nodeStats.getSum(), sumPercent,
nodeStats.getMin() == Integer.MAX_VALUE ? 0 : nodeStats.getMin(),
nodeStats.getAverage(), nodeStats.getMax() == Integer.MIN_VALUE ? 0 : nodeStats.getMax(),
formatSourceSection(nodeStats, nodeStats.maxSourceSection));
}
// custom version of SourceSection#getShortDescription
private static String formatSourceSection(IntStatistics stats, SourceSection s) {
if (s == null) {
if (stats.getCount() > 0) {
return "N/A";
} else {
return " - ";
}
}
StringBuilder b = new StringBuilder();
if (s.getSource().getPath() == null) {
b.append(s.getSource().getName());
} else {
Path pathAbsolute = Paths.get(s.getSource().getPath());
Path pathBase = new File("").getAbsoluteFile().toPath();
try {
Path pathRelative = pathBase.relativize(pathAbsolute);
b.append(pathRelative.toFile());
} catch (IllegalArgumentException e) {
b.append(s.getSource().getName());
}
}
b.append("~");
formatIndices(b, s);
return b.toString();
}
private static void formatIndices(StringBuilder b, SourceSection s) {
boolean singleLine = s.getStartLine() == s.getEndLine();
if (singleLine) {
b.append(s.getStartLine());
} else {
b.append(s.getStartLine()).append("-").append(s.getEndLine());
}
b.append(":");
if (s.getCharLength() <= 1) {
b.append(s.getCharIndex());
} else {
b.append(s.getCharIndex()).append("-").append(s.getCharIndex() + s.getCharLength() - 1);
}
}
}
static final class TypeCombination {
final TypeCombination next;
final Class[] types;
int executionCount;
TypeCombination(TypeCombination next, Class[] types) {
this.next = next;
this.types = types;
}
String getDisplayName() {
if (types.length == 0) {
return "";
}
StringBuilder b = new StringBuilder();
b.append("<");
String sep = "";
for (int i = 0; i < types.length; i++) {
b.append(sep);
b.append(types[i].getSimpleName());
sep = " ";
}
b.append(">");
return b.toString();
}
@Override
public int hashCode() {
return Arrays.hashCode(types);
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof TypeCombination)) {
return false;
}
return Arrays.equals(types, ((TypeCombination) obj).types);
}
}
static final class DisabledNodeStatistics extends NodeStatistics {
static final DisabledNodeStatistics INSTANCE = new DisabledNodeStatistics();
@Override
public void acceptExecute(int specializationIndex, Class arg0) {
}
@Override
public void acceptExecute(int specializationIndex, Class arg0, Class arg1) {
}
@Override
public void acceptExecute(int specializationIndex, Class... args) {
}
@Override
public Class resolveValueClass(Object value) {
return null;
}
}
static final class UncachedNodeStatistics extends NodeStatistics {
final Node node;
final String[] specializationNames;
UncachedNodeStatistics(Node node, String[] specializations) {
this.node = node;
this.specializationNames = specializations;
}
@Override
@TruffleBoundary
public void acceptExecute(int specializationIndex, Class arg0) {
lookup().acceptExecute(specializationIndex, arg0);
}
@Override
@TruffleBoundary
public void acceptExecute(int specializationIndex, Class arg0, Class arg1) {
lookup().acceptExecute(specializationIndex, arg0, arg1);
}
@Override
@TruffleBoundary
public void acceptExecute(int specializationIndex, Class... args) {
lookup().acceptExecute(specializationIndex, args);
}
@Override
public Class resolveValueClass(Object value) {
if (value == null) {
return void.class;
} else {
return value.getClass();
}
}
private NodeStatistics lookup() {
SpecializationStatistics statistics = STATISTICS.get();
if (statistics != null) {
synchronized (statistics) {
return statistics.uncachedStatistics.computeIfAbsent(node, (n) -> createUncachedStatistic(statistics, n));
}
} else {
return DisabledNodeStatistics.INSTANCE;
}
}
private EnabledNodeStatistics createUncachedStatistic(SpecializationStatistics statistics, Node n) {
NodeClassStatistics classStat = statistics.getClassStatistics(this.node.getClass(), specializationNames);
EnabledNodeStatistics nodeStatistic = new EnabledNodeStatistics(n, classStat);
classStat.statistics.add(nodeStatistic);
return nodeStatistic;
}
}
static final class EnabledNodeStatistics extends NodeStatistics {
private static final Object UNDEFINED_SOURCE_SECTION = new Object();
@CompilationFinal(dimensions = 1) final TypeCombination[] specializations;
final WeakReference nodeRef;
private Object sourceSection = UNDEFINED_SOURCE_SECTION;
EnabledNodeStatistics(Node node, NodeClassStatistics statistics) {
this.nodeRef = new WeakReference<>(node);
this.specializations = new TypeCombination[statistics.collectedHistogram.getSpecializationNames().length];
}
SourceSection getSourceSection() {
if (sourceSection == UNDEFINED_SOURCE_SECTION) {
return null;
}
return (SourceSection) sourceSection;
}
boolean isCollected() {
return nodeRef.get() == null;
}
@Override
@ExplodeLoop
public void acceptExecute(int specializationIndex, Class arg0) {
CompilerAsserts.partialEvaluationConstant(this);
TypeCombination combination = specializations[specializationIndex];
while (combination != null) {
if (combination.types.length == 1) {
if (combination.types[0] == arg0) {
combination.executionCount++;
return;
}
}
combination = combination.next;
}
CompilerDirectives.transferToInterpreterAndInvalidate();
insertCombination(specializationIndex, arg0).executionCount++;
}
@Override
@ExplodeLoop
public void acceptExecute(int specializationIndex, Class arg0, Class arg1) {
CompilerAsserts.partialEvaluationConstant(this);
TypeCombination combination = specializations[specializationIndex];
while (combination != null) {
if (combination.types.length == 2) {
if (combination.types[0] == arg0 && combination.types[1] == arg1) {
combination.executionCount++;
return;
}
}
combination = combination.next;
}
CompilerDirectives.transferToInterpreterAndInvalidate();
insertCombination(specializationIndex, arg0, arg1).executionCount++;
}
@Override
@ExplodeLoop
public void acceptExecute(int specializationIndex, Class... args) {
CompilerAsserts.partialEvaluationConstant(this);
TypeCombination combination = findCombination(specializationIndex, args);
if (combination != null) {
combination.executionCount++;
return;
}
CompilerDirectives.transferToInterpreterAndInvalidate();
insertCombination(specializationIndex, args).executionCount++;
}
@Override
@SuppressWarnings("static-method")
public Class resolveValueClass(Object value) {
if (value == null) {
return void.class;
} else {
return value.getClass();
}
}
@ExplodeLoop
private TypeCombination findCombination(int specializationIndex, Class... args) {
TypeCombination combination = specializations[specializationIndex];
while (combination != null) {
if (combination.types.length == args.length) {
boolean valid = true;
for (int i = 0; i < combination.types.length; i++) {
if (combination.types[i] != args[i]) {
valid = false;
break;
}
}
if (valid) {
return combination;
}
}
combination = combination.next;
}
return null;
}
private synchronized TypeCombination insertCombination(int specializationIndex, Class... args) {
if (this.sourceSection == UNDEFINED_SOURCE_SECTION) {
Node node = nodeRef.get();
if (node != null) {
this.sourceSection = node.getEncapsulatingSourceSection();
} else {
// this should not happen, but there is no guarantee
this.sourceSection = null;
}
}
TypeCombination combination = findCombination(specializationIndex, args);
if (combination != null) {
return combination;
}
specializations[specializationIndex] = combination = new TypeCombination(specializations[specializationIndex], args);
return combination;
}
}
/**
* Class to collect statistics information per node. This class is intended to be used by
* Truffle DSL generated code only. Do not use directly.
*
* @since 20.3
*/
public abstract static class NodeStatistics {
NodeStatistics() {
}
/**
* Called when a node specialization was executed. This method is intended to be used by
* Truffle DSL generated code only. Do not use directly.
*
* @since 20.3
*/
public abstract void acceptExecute(int specializationIndex, Class arg0);
/**
* Called when a node specialization was executed. This method is intended to be used by
* Truffle DSL generated code only. Do not use directly.
*
* @since 20.3
*/
public abstract void acceptExecute(int specializationIndex, Class arg0, Class arg1);
/**
* Called when a node specialization was executed. This method is intended to be used by
* Truffle DSL generated code only. Do not use directly.
*
* @since 20.3
*/
public abstract void acceptExecute(int specializationIndex, Class... args);
/**
* Called to resolve the class of a value provided in {@link #acceptExecute(int, Class)}.
* This method is intended to be used by Truffle DSL generated code only. Do not use
* directly.
*
* @since 20.3
*/
public abstract Class resolveValueClass(Object value);
/**
* Called when a new node statistics object is created. This method is intended to be used
* by Truffle DSL generated code only. Do not use directly.
*
* @since 20.3
*/
public static NodeStatistics create(Node node, String[] specializations) {
if (node.isAdoptable()) {
SpecializationStatistics stat = STATISTICS.get();
if (stat == null) {
return DisabledNodeStatistics.INSTANCE;
}
return stat.createCachedNodeStatistic(node, specializations);
} else {
return SpecializationStatistics.createUncachedNodeStatistic(node, specializations);
}
}
}
}