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[java] Fix #5293: Parse number of type parameters eagerly (#5309)

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This commit is contained in:
Juan Martín Sotuyo Dodero 2024-11-07 06:19:16 -06:00 committed by GitHub
commit fe88498ee8
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8 changed files with 240 additions and 19 deletions
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2
docs/pages/release_notes.md
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@ -17,6 +17,8 @@ This is a {{ site.pmd.release_type }} release.
### 🐛 Fixed Issues
* ant
* [#1860](https://github.com/pmd/pmd/issues/1860): \[ant] Reflective access warnings on java > 9 and java < 17
* java
* [#5293](https://github.com/pmd/pmd/issues/5293): \[java] Deadlock when executing PMD in multiple threads
### 🚨 API Changes

11
pmd-java/src/main/java/net/sourceforge/pmd/lang/java/symbols/internal/asm/ClassStub.java
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@ -84,12 +84,7 @@ final class ClassStub implements JClassSymbol, AsmStub, AnnotationOwner {
this.resolver = resolver;
this.names = new Names(internalName);
this.parseLock = new ParseLock() {
// note to devs: to debug the parsing logic you might have
// to replace the implementation of toString temporarily,
// otherwise an IDE could call toString just to show the item
// in the debugger view (which could cause parsing of the class file).
this.parseLock = new ParseLock("ClassStub:" + internalName) {
@Override
protected boolean doParse() throws IOException {
try (InputStream instream = loader.getInputStream()) {
@ -315,9 +310,9 @@ final class ClassStub implements JClassSymbol, AsmStub, AnnotationOwner {
}
@Override
public boolean isGeneric() {
public int getTypeParameterCount() {
parseLock.ensureParsed();
return signature.isGeneric();
return signature.getTypeParameterCount();
}
@Override

28
pmd-java/src/main/java/net/sourceforge/pmd/lang/java/symbols/internal/asm/GenericSigBase.java
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@ -46,9 +46,9 @@ abstract class GenericSigBase<T extends JTypeParameterOwnerSymbol & AsmStub> {
protected List<JTypeVar> typeParameters;
private final ParseLock lock;
protected GenericSigBase(T ctx) {
protected GenericSigBase(T ctx, String parseLockName) {
this.ctx = ctx;
this.lock = new ParseLock() {
this.lock = new ParseLock(parseLockName) {
@Override
protected boolean doParse() {
GenericSigBase.this.doParse();
@ -81,7 +81,11 @@ abstract class GenericSigBase<T extends JTypeParameterOwnerSymbol & AsmStub> {
protected abstract boolean postCondition();
protected abstract boolean isGeneric();
protected abstract int getTypeParameterCount();
protected boolean isGeneric() {
return getTypeParameterCount() > 0;
}
public void setTypeParams(List<JTypeVar> tvars) {
assert this.typeParameters == null : "Type params were already parsed for " + this;
@ -105,6 +109,7 @@ abstract class GenericSigBase<T extends JTypeParameterOwnerSymbol & AsmStub> {
private static final String OBJECT_BOUND = ":" + OBJECT_SIG;
private final @Nullable String signature;
private final int typeParameterCount;
private @Nullable JClassType superType;
private List<JClassType> superItfs;
@ -116,8 +121,9 @@ abstract class GenericSigBase<T extends JTypeParameterOwnerSymbol & AsmStub> {
@Nullable String signature, // null if doesn't use generics in header
@Nullable String superInternalName, // null if this is the Object class
String[] interfaces) {
super(ctx);
super(ctx, "LazyClassSignature:" + ctx.getInternalName() + "[" + signature + "]");
this.signature = signature;
this.typeParameterCount = GenericTypeParameterCounter.determineTypeParameterCount(this.signature);
this.rawItfs = CollectionUtil.map(interfaces, ctx.getResolver()::resolveFromInternalNameCannotFail);
this.rawSuper = ctx.getResolver().resolveFromInternalNameCannotFail(superInternalName);
@ -157,8 +163,9 @@ abstract class GenericSigBase<T extends JTypeParameterOwnerSymbol & AsmStub> {
}
@Override
protected boolean isGeneric() {
return signature != null && TypeParamsParser.hasTypeParams(signature);
protected int getTypeParameterCount() {
// note: no ensureParsed() needed, the type parameters are counted eagerly
return typeParameterCount;
}
@Override
@ -206,6 +213,7 @@ abstract class GenericSigBase<T extends JTypeParameterOwnerSymbol & AsmStub> {
static class LazyMethodType extends GenericSigBase<ExecutableStub> implements TypeAnnotationReceiver {
private final @NonNull String signature;
private final int typeParameterCount;
private @Nullable TypeAnnotationSet receiverAnnotations;
private List<JTypeMirror> parameterTypes;
@ -233,8 +241,9 @@ abstract class GenericSigBase<T extends JTypeParameterOwnerSymbol & AsmStub> {
@Nullable String genericSig,
@Nullable String[] exceptions,
boolean skipFirstParam) {
super(ctx);
super(ctx, "LazyMethodType:" + (genericSig != null ? genericSig : descriptor));
this.signature = genericSig != null ? genericSig : descriptor;
this.typeParameterCount = GenericTypeParameterCounter.determineTypeParameterCount(genericSig);
// generic signatures already omit the synthetic param
this.skipFirstParam = skipFirstParam && genericSig == null;
this.rawExceptions = exceptions;
@ -288,8 +297,9 @@ abstract class GenericSigBase<T extends JTypeParameterOwnerSymbol & AsmStub> {
@Override
protected boolean isGeneric() {
return TypeParamsParser.hasTypeParams(signature);
protected int getTypeParameterCount() {
// note: no ensureParsed() needed, the type parameters are counted eagerly
return typeParameterCount;
}
void setParameterTypes(List<JTypeMirror> params) {

36
pmd-java/src/main/java/net/sourceforge/pmd/lang/java/symbols/internal/asm/GenericTypeParameterCounter.java Normal file
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@ -0,0 +1,36 @@
/*
* BSD-style license; for more info see http://pmd.sourceforge.net/license.html
*/
package net.sourceforge.pmd.lang.java.symbols.internal.asm;
import org.objectweb.asm.signature.SignatureReader;
import org.objectweb.asm.signature.SignatureVisitor;
class GenericTypeParameterCounter extends SignatureVisitor {
private int count;
GenericTypeParameterCounter() {
super(AsmSymbolResolver.ASM_API_V);
}
@Override
public void visitFormalTypeParameter(String name) {
count++;
}
public int getCount() {
return count;
}
static int determineTypeParameterCount(String signature) {
if (signature == null) {
return 0;
}
SignatureReader signatureReader = new SignatureReader(signature);
GenericTypeParameterCounter counter = new GenericTypeParameterCounter();
signatureReader.accept(counter);
return counter.getCount();
}
}

2
pmd-java/src/main/java/net/sourceforge/pmd/lang/java/symbols/internal/asm/ModuleStub.java
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@ -35,7 +35,7 @@ class ModuleStub implements JModuleSymbol, AsmStub, AnnotationOwner {
this.resolver = resolver;
this.moduleName = moduleName;
this.parseLock = new ParseLock() {
this.parseLock = new ParseLock("ModuleStub:" + moduleName) {
@Override
protected boolean doParse() throws IOException {
try (InputStream instream = loader.getInputStream()) {

18
pmd-java/src/main/java/net/sourceforge/pmd/lang/java/symbols/internal/asm/ParseLock.java
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@ -17,15 +17,30 @@ abstract class ParseLock {
private static final Logger LOG = LoggerFactory.getLogger(ParseLock.class);
private volatile ParseStatus status = ParseStatus.NOT_PARSED;
private final String name;
protected ParseLock(String name) {
this.name = name;
}
public void ensureParsed() {
getFinalStatus();
}
private void logParseLockTrace(String prefix) {
if (LOG.isTraceEnabled()) {
LOG.trace("{} {}: {}", Thread.currentThread().getName(), String.format("%-15s", prefix), this);
}
}
private ParseStatus getFinalStatus() {
ParseStatus status = this.status;
if (!status.isFinished) {
logParseLockTrace("waiting on");
synchronized (this) {
logParseLockTrace("locked");
status = this.status;
if (status == ParseStatus.NOT_PARSED) {
this.status = ParseStatus.BEING_PARSED;
@ -54,6 +69,7 @@ abstract class ParseLock {
throw new IllegalStateException("Thread is reentering the parse lock");
}
}
logParseLockTrace("released");
}
return status;
}
@ -85,7 +101,7 @@ abstract class ParseLock {
@Override
public String toString() {
return "ParseLock{status=" + status + '}';
return "ParseLock{name=" + name + ",status=" + status + '}';
}
private enum ParseStatus {

157
pmd-java/src/test/java/net/sourceforge/pmd/lang/java/symbols/DeadlockTest.java Normal file
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@ -0,0 +1,157 @@
/*
* BSD-style license; for more info see http://pmd.sourceforge.net/license.html
*/
package net.sourceforge.pmd.lang.java.symbols;
import static org.junit.jupiter.api.Assertions.assertAll;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertNull;
import java.util.ArrayList;
import java.util.List;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.Timeout;
import net.sourceforge.pmd.lang.java.JavaParsingHelper;
import net.sourceforge.pmd.lang.java.ast.ASTClassType;
import net.sourceforge.pmd.lang.java.ast.ASTCompilationUnit;
/**
* Tests to help analyze [java] Deadlock when executing PMD in multiple threads #5293.
*
* @see <a href="https://github.com/pmd/pmd/issues/5293">[java] Deadlock when executing PMD in multiple threads #5293</a>
*/
class DeadlockTest {
abstract static class Outer<T> implements GenericInterface<Outer<T>, GenericClass<T>> {
// must be a nested class, that is reusing the type param T of the outer class
abstract static class Inner<T> {
Inner(Outer<T> grid) { }
}
}
static class GenericBaseClass<T> { }
interface GenericInterface<T, S> { }
abstract static class GenericClass<T> extends GenericBaseClass<Outer.Inner<T>> { }
@Test
@Timeout(2)
void parseWithoutDeadlock() throws InterruptedException {
/*
Deadlock:
t1 -> locks parse for Outer.Inner and waits for parse lock for Outer
├─ t1 waiting on : ParseLock{name=LazyClassSignature:net/sourceforge/pmd/lang/java/symbols/DeadlockTest$Outer$Inner[<T:Ljava/lang/Object;>Ljava/lang/Object;],status=NOT_PARSED}
└─ t1 locked : ParseLock{name=LazyClassSignature:net/sourceforge/pmd/lang/java/symbols/DeadlockTest$Outer$Inner[<T:Ljava/lang/Object;>Ljava/lang/Object;],status=NOT_PARSED}
└─ t1 waiting on : ParseLock{name=LazyClassSignature:net/sourceforge/pmd/lang/java/symbols/DeadlockTest$Outer[<T:Ljava/lang/Object;>Ljava/lang/Object;Lnet/sourceforge/pmd/lang/java/symbols/DeadlockTest$GenericInterface<Lnet/sourceforge/pmd/lang/java/symbols/DeadlockTest$Outer<TT;>;Lnet/sourceforge/pmd/lang/java/symbols/DeadlockTest$GenericClass<TT;>;>;],status=BEING_PARSED}
t2 -> locks parse for Outer, locks parse for GenericInterface and then waits for parse lock for Outer.Inner
├─ t2 waiting on : ParseLock{name=LazyClassSignature:net/sourceforge/pmd/lang/java/symbols/DeadlockTest$Outer[<T:Ljava/lang/Object;>Ljava/lang/Object;Lnet/sourceforge/pmd/lang/java/symbols/DeadlockTest$GenericInterface<Lnet/sourceforge/pmd/lang/java/symbols/DeadlockTest$Outer<TT;>;Lnet/sourceforge/pmd/lang/java/symbols/DeadlockTest$GenericClass<TT;>;>;],status=NOT_PARSED}
└─ t2 locked : ParseLock{name=LazyClassSignature:net/sourceforge/pmd/lang/java/symbols/DeadlockTest$Outer[<T:Ljava/lang/Object;>Ljava/lang/Object;Lnet/sourceforge/pmd/lang/java/symbols/DeadlockTest$GenericInterface<Lnet/sourceforge/pmd/lang/java/symbols/DeadlockTest$Outer<TT;>;Lnet/sourceforge/pmd/lang/java/symbols/DeadlockTest$GenericClass<TT;>;>;],status=NOT_PARSED}
├─ t2 waiting on : ParseLock{name=LazyClassSignature:net/sourceforge/pmd/lang/java/symbols/DeadlockTest[null],status=NOT_PARSED}
├─ t2 locked : ParseLock{name=LazyClassSignature:net/sourceforge/pmd/lang/java/symbols/DeadlockTest[null],status=NOT_PARSED}
├─ t2 released : ParseLock{name=LazyClassSignature:net/sourceforge/pmd/lang/java/symbols/DeadlockTest[null],status=FULL}
├─ t2 waiting on : ParseLock{name=LazyClassSignature:net/sourceforge/pmd/lang/java/symbols/DeadlockTest$Outer[<T:Ljava/lang/Object;>Ljava/lang/Object;Lnet/sourceforge/pmd/lang/java/symbols/DeadlockTest$GenericInterface<Lnet/sourceforge/pmd/lang/java/symbols/DeadlockTest$Outer<TT;>;Lnet/sourceforge/pmd/lang/java/symbols/DeadlockTest$GenericClass<TT;>;>;],status=BEING_PARSED}
├─ t2 locked : ParseLock{name=LazyClassSignature:net/sourceforge/pmd/lang/java/symbols/DeadlockTest$Outer[<T:Ljava/lang/Object;>Ljava/lang/Object;Lnet/sourceforge/pmd/lang/java/symbols/DeadlockTest$GenericInterface<Lnet/sourceforge/pmd/lang/java/symbols/DeadlockTest$Outer<TT;>;Lnet/sourceforge/pmd/lang/java/symbols/DeadlockTest$GenericClass<TT;>;>;],status=BEING_PARSED}
├─ t2 released : ParseLock{name=LazyClassSignature:net/sourceforge/pmd/lang/java/symbols/DeadlockTest$Outer[<T:Ljava/lang/Object;>Ljava/lang/Object;Lnet/sourceforge/pmd/lang/java/symbols/DeadlockTest$GenericInterface<Lnet/sourceforge/pmd/lang/java/symbols/DeadlockTest$Outer<TT;>;Lnet/sourceforge/pmd/lang/java/symbols/DeadlockTest$GenericClass<TT;>;>;],status=BEING_PARSED}
└─ t2 waiting on : ParseLock{name=LazyClassSignature:net/sourceforge/pmd/lang/java/symbols/DeadlockTest$GenericClass[<T:Ljava/lang/Object;>Lnet/sourceforge/pmd/lang/java/symbols/DeadlockTest$GenericBaseClass<Lnet/sourceforge/pmd/lang/java/symbols/DeadlockTest$Outer$Inner<TT;>;>;],status=NOT_PARSED}
├─ t2 locked : ParseLock{name=LazyClassSignature:net/sourceforge/pmd/lang/java/symbols/DeadlockTest$GenericClass[<T:Ljava/lang/Object;>Lnet/sourceforge/pmd/lang/java/symbols/DeadlockTest$GenericBaseClass<Lnet/sourceforge/pmd/lang/java/symbols/DeadlockTest$Outer$Inner<TT;>;>;],status=NOT_PARSED}
└─ t2 waiting on : ParseLock{name=LazyClassSignature:net/sourceforge/pmd/lang/java/symbols/DeadlockTest$Outer$Inner[<T:Ljava/lang/Object;>Ljava/lang/Object;],status=NOT_PARSED}
In order to reproduce the deadlock reliably, add the following piece into ParseLock, just at the beginning
of the synchronized block (line 42):
// t1 needs to wait after having the lock, so that t2 can go on and wait on the same lock
if (Thread.currentThread().getName().equals("t1") && this.toString().contains("LazyClassSignature:net/sourceforge/pmd/lang/java/symbols/DeadlockTest$Outer$Inner[<T:L")) {
try {
Thread.sleep(500);
} catch (InterruptedException ignored) {
}
}
And then, introduce a bug again. One way to make the test fail is:
Comment out the method "public int getTypeParameterCount()", so that it is inherited again.
Add the following method:
@Override
public boolean isGeneric() {
parseLock.ensureParsed();
return signature.isGeneric();
}
*/
List<Throwable> exceptions = new ArrayList<>();
Thread.UncaughtExceptionHandler exceptionHandler = (t, e) -> {
exceptions.add(e);
e.printStackTrace();
};
Thread t1 = new Thread(() -> {
ASTCompilationUnit class1 = JavaParsingHelper.DEFAULT.parse(
"package net.sourceforge.pmd.lang.java.symbols;\n"
+ "import net.sourceforge.pmd.lang.java.symbols.DeadlockTest.Outer;\n"
+ " class Class1 {\n"
+ " public static <X> Outer.Inner<X> newInner(Outer<X> grid) {\n"
+ " return null;\n"
+ " }\n"
+ " }\n"
);
assertNotNull(class1);
// Outer.Inner<X> = return type of method "newInner"
List<ASTClassType> classTypes = class1.descendants(ASTClassType.class).toList();
ASTClassType outerInner = classTypes.get(0);
assertGenericClassType(outerInner, "Inner", "X", "T");
// Outer = qualifier of Outer.Inner<X>
ASTClassType outer = classTypes.get(1);
assertEquals("Outer", outer.getSimpleName());
assertNull(outer.getTypeArguments());
// Outer<X> = formal parameter type of method newInner
ASTClassType outerFormalParam = classTypes.get(3);
assertGenericClassType(outerFormalParam, "Outer", "X", "T");
}, "t1");
t1.setUncaughtExceptionHandler(exceptionHandler);
Thread t2 = new Thread(() -> {
ASTCompilationUnit class2 = JavaParsingHelper.DEFAULT.parse(
"package net.sourceforge.pmd.lang.java.symbols;\n"
+ "import net.sourceforge.pmd.lang.java.symbols.DeadlockTest.Outer;\n"
+ " class Class2<M> {\n"
+ " protected Outer<M> theOuter;\n"
+ " }\n"
);
assertNotNull(class2);
// Outer<M> = type of field "theOuter"
ASTClassType firstClassType = class2.descendants(ASTClassType.class).first();
assertNotNull(firstClassType);
assertGenericClassType(firstClassType, "Outer", "M", "T");
}, "t2");
t2.setUncaughtExceptionHandler(exceptionHandler);
t1.start();
t2.start();
t1.join();
t2.join();
assertAll(exceptions.stream()
.map(e -> () -> {
throw e;
}));
}
private static void assertGenericClassType(ASTClassType classType, String simpleName, String actualTypeParamName, String originalTypeParamName) {
assertEquals(simpleName, classType.getSimpleName());
assertEquals(1, classType.getTypeArguments().size());
assertEquals(actualTypeParamName, ((ASTClassType) classType.getTypeArguments().get(0)).getSimpleName());
JTypeParameterOwnerSymbol symbol = (JTypeParameterOwnerSymbol) classType.getTypeMirror().getSymbol();
assertEquals(1, symbol.getTypeParameterCount());
assertEquals(originalTypeParamName, symbol.getTypeParameters().get(0).getName());
}
}

5
pmd-java/src/test/resources/simplelogger.properties Normal file
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@ -0,0 +1,5 @@
#
# BSD-style license; for more info see http://pmd.sourceforge.net/license.html
#
#org.slf4j.simpleLogger.log.net.sourceforge.pmd.lang.java.symbols.internal.asm.ParseLock=trace