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package com.oracle.truffle.polyglot;
import java.util.function.Consumer;
import java.util.function.Predicate;
import org.graalvm.polyglot.ResourceLimitEvent;
import org.graalvm.polyglot.ResourceLimits;
import org.graalvm.polyglot.Source;
import com.oracle.truffle.api.Assumption;
import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
import com.oracle.truffle.api.Truffle;
import com.oracle.truffle.api.TruffleSafepoint;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.instrumentation.EventBinding;
import com.oracle.truffle.api.instrumentation.EventContext;
import com.oracle.truffle.api.instrumentation.ExecutionEventNode;
import com.oracle.truffle.api.instrumentation.ExecutionEventNodeFactory;
import com.oracle.truffle.api.instrumentation.Instrumenter;
import com.oracle.truffle.api.instrumentation.SourceSectionFilter;
import com.oracle.truffle.api.instrumentation.SourceSectionFilter.SourcePredicate;
import com.oracle.truffle.api.instrumentation.StandardTags.StatementTag;
/**
* Limits objects that backs the {@link ResourceLimits} API object.
*/
final class PolyglotLimits {
final long statementLimit;
final Predicate statementLimitSourcePredicate;
final Consumer onEvent;
PolyglotLimits(long statementLimit, Predicate statementLimitSourcePredicate, Consumer onEvent) {
this.statementLimit = statementLimit;
this.statementLimitSourcePredicate = statementLimitSourcePredicate;
this.onEvent = onEvent;
}
static void reset(PolyglotContextImpl context) {
synchronized (context) {
context.statementCounter = context.statementLimit;
context.volatileStatementCounter.set(context.statementLimit);
}
}
static final Object CACHED_CONTEXT = new Object() {
@Override
public String toString() {
return "$$$cached_context$$$";
}
};
static final class StatementIncrementNode extends ExecutionEventNode {
final EngineLimits limits;
final EventContext eventContext;
final PolyglotEngineImpl engine;
@CompilationFinal private boolean seenInnerContext;
StatementIncrementNode(EventContext context, EngineLimits limits) {
this.limits = limits;
this.eventContext = context;
this.engine = limits.engine;
}
@Override
protected void onEnter(VirtualFrame frame) {
PolyglotContextImpl currentContext = getLimitContext();
long count;
if (engine.singleThreadPerContext.isValid()) {
count = --currentContext.statementCounter;
} else {
count = currentContext.volatileStatementCounter.decrementAndGet();
}
if (count < 0) { // overflowed
CompilerDirectives.transferToInterpreterAndInvalidate();
notifyStatementLimitReached(currentContext, currentContext.statementLimit - count, currentContext.statementLimit);
}
}
private PolyglotContextImpl getLimitContext() {
PolyglotContextImpl context = PolyglotFastThreadLocals.getContextWithEngine(engine);
if (engine.noInnerContexts.isValid() || context.parent == null) {
// fast path for no inner contexts
return context;
}
if (!seenInnerContext) {
CompilerDirectives.transferToInterpreterAndInvalidate();
seenInnerContext = true;
}
while (context.parent != null) {
context = context.parent;
}
return context;
}
private void notifyStatementLimitReached(PolyglotContextImpl context, long actualCount, long limit) {
boolean limitReached = false;
synchronized (context) {
// reset statement counter
if (limits.engine.singleThreadPerContext.isValid()) {
if (context.statementCounter < 0) {
context.statementCounter = limit;
limitReached = true;
}
} else {
if (context.volatileStatementCounter.get() < 0) {
context.volatileStatementCounter.set(limit);
limitReached = true;
}
}
}
if (limitReached) {
context.cancel(true, String.format("Statement count limit of %s exceeded. Statements executed %s.", limit, actualCount));
RuntimeException e = limits.notifyEvent(context);
if (e != null) {
throw e;
}
TruffleSafepoint.pollHere(eventContext.getInstrumentedNode());
}
}
}
/**
* Resource limit related data for each engine. Lazily constructed.
*/
static final class EngineLimits {
private static final Predicate NO_PREDICATE = new Predicate<>() {
public boolean test(Source t) {
return true;
}
};
final PolyglotEngineImpl engine;
@CompilationFinal long statementLimit = -1;
@CompilationFinal Assumption sameStatementLimit;
@CompilationFinal Predicate statementLimitSourcePredicate;
EventBinding statementLimitBinding;
EngineLimits(PolyglotEngineImpl engine) {
this.engine = engine;
}
void validate(PolyglotLimits limits) {
if (limits != null && limits.statementLimit != 0) {
Predicate newPredicate = limits.statementLimitSourcePredicate;
if (newPredicate == null) {
newPredicate = NO_PREDICATE;
}
if (this.statementLimitSourcePredicate != null && newPredicate != statementLimitSourcePredicate) {
throw PolyglotEngineException.illegalArgument("Using multiple source predicates per engine is not supported. " +
"The same statement limit source predicate must be used for all polyglot contexts that are assigned to the same engine. " +
"Resolve this by using the same predicate instance when constructing the limits object with ResourceLimits.Builder.statementLimit(long, Predicate).");
}
}
}
void initialize(PolyglotLimits limits, PolyglotContextImpl context) {
assert Thread.holdsLock(engine.lock);
if (limits.statementLimit != 0) {
Predicate newPredicate = limits.statementLimitSourcePredicate;
if (newPredicate == null) {
newPredicate = NO_PREDICATE;
}
if (this.statementLimitSourcePredicate == null) {
this.statementLimitSourcePredicate = newPredicate;
}
// ensured by validate
assert this.statementLimitSourcePredicate == newPredicate;
Assumption sameLimit = this.sameStatementLimit;
if (sameLimit != null && sameLimit.isValid() && limits.statementLimit != statementLimit) {
sameLimit.invalidate();
} else if (sameLimit == null) {
this.sameStatementLimit = Truffle.getRuntime().createAssumption("Same statement limit.");
this.statementLimit = limits.statementLimit;
}
if (statementLimitBinding == null) {
Instrumenter instrumenter = (Instrumenter) EngineAccessor.INSTRUMENT.getEngineInstrumenter(engine.instrumentationHandler);
SourceSectionFilter.Builder filter = SourceSectionFilter.newBuilder().tagIs(StatementTag.class);
if (statementLimitSourcePredicate != null) {
filter.sourceIs(new SourcePredicate() {
@Override
public boolean test(com.oracle.truffle.api.source.Source s) {
try {
return statementLimitSourcePredicate.test(PolyglotImpl.getOrCreatePolyglotSource(engine.getImpl(), s));
} catch (Throwable e) {
throw context.engine.host.toHostException(context.getHostContextImpl(), e);
}
}
});
}
statementLimitBinding = instrumenter.attachExecutionEventFactory(filter.build(), new ExecutionEventNodeFactory() {
public ExecutionEventNode create(EventContext eventContext) {
return new StatementIncrementNode(eventContext, EngineLimits.this);
}
});
}
}
reset(context);
}
long getStatementLimit() {
return statementLimit;
}
RuntimeException notifyEvent(PolyglotContextImpl context) {
PolyglotLimits limits = context.config.limits;
if (limits == null) {
return null;
}
Consumer onEvent = limits.onEvent;
if (onEvent == null) {
return null;
}
ResourceLimitEvent event = engine.getImpl().getAPIAccess().newResourceLimitsEvent(context.api);
try {
onEvent.accept(event);
} catch (Throwable t) {
throw context.engine.host.toHostException(context.getHostContextImpl(), t);
}
return null;
}
}
}
