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Allow lambdas and method references referencing subclasses #4438

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Allow lambdas and method references referencing subclasses #4438

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d9daedd
Add tests
tkindy Jun 14, 2024
48b95a7
Ignore member refs and lambdas
tkindy Jun 14, 2024
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12 changes: 12 additions & 0 deletions core/src/main/java/com/google/errorprone/bugpatterns/ClassInitializationDeadlock.java
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,8 @@
import com.sun.source.tree.ClassTree;
import com.sun.source.tree.ExpressionTree;
import com.sun.source.tree.IdentifierTree;
import com.sun.source.tree.LambdaExpressionTree;
import com.sun.source.tree.MemberReferenceTree;
import com.sun.source.tree.MemberSelectTree;
import com.sun.source.tree.MethodTree;
import com.sun.source.tree.Tree;
Expand Down Expand Up @@ -112,6 +114,16 @@ public Void visitMethod(MethodTree node, Void unused) {
return null;
}

@Override
public Void visitMemberReference(MemberReferenceTree node, Void unused) {
return null;
}

@Override
public Void visitLambdaExpression(LambdaExpressionTree node, Void unused) {
return null;
}

@Override
public Void visitMemberSelect(MemberSelectTree tree, Void unused) {
if (ASTHelpers.constValue(tree) != null) {
Expand Down
60 changes: 60 additions & 0 deletions core/src/test/java/com/google/errorprone/bugpatterns/ClassInitializationDeadlockTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@

import com.google.auto.value.processor.AutoValueProcessor;
import com.google.errorprone.CompilationTestHelper;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
Expand Down Expand Up @@ -309,4 +310,63 @@ public void nonNestedSubclass() {
"class B extends A {}")
.doTest();
}

@Test
public void simpleSubclassMethodReference() {
testHelper
.addSourceLines(
"Foo.java",
"import java.util.function.Supplier;",
"class A {",
" static Supplier<B> supplier = B::new;",
"}",
"class B extends A {}")
.doTest();
}

@Test
public void compoundSubclassMethodReference() {
testHelper
.addSourceLines(
"Foo.java",
"import java.util.Comparator;",
"class A {",
" static Comparator<B> comparator = Comparator.comparing(B::value);",
"}",
"class B extends A {",
" int value;",
" int value() {",
" return value;",
" }",
"}")
.doTest();
}

@Test
public void lambda() {
testHelper
.addSourceLines(
"Foo.java",
"import java.util.function.Supplier;",
"class A {",
" static Supplier<B> supplier = () -> new B();",
"}",
"class B extends A {}")
.doTest();
}

@Test
public void subclassStaticMethod() {
testHelper
.addSourceLines(
"Foo.java",
"class A {",
" // BUG: Diagnostic contains:",
" static int value = B.value(); ",
"}",
"class B extends A {",
" static int value() { return 0; }",
"}")
.doTest();
}
Comment on lines +358 to +371
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The check's treatment of this situation is unchanged with this PR. I just noticed it wasn't tested and wanted to make sure it was still catching this usage while working on the check.

}
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