-
Notifications
You must be signed in to change notification settings - Fork 732
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Add the DistinctVarargs BugChecker. This will generate warning when m…
…ethod expecting distinct varargs is invoked with same variable argument. PiperOrigin-RevId: 405668886
- Loading branch information
1 parent
122e512
commit cdfa8b8
Showing
4 changed files
with
373 additions
and
0 deletions.
There are no files selected for viewing
147 changes: 147 additions & 0 deletions
147
core/src/main/java/com/google/errorprone/bugpatterns/DistinctVarargsChecker.java
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,147 @@ | ||
| /* | ||
| * Copyright 2021 The Error Prone Authors. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| package com.google.errorprone.bugpatterns; | ||
|
|
||
| import static com.google.errorprone.BugPattern.SeverityLevel.WARNING; | ||
| import static com.google.errorprone.matchers.Matchers.anyOf; | ||
| import static com.google.errorprone.matchers.method.MethodMatchers.staticMethod; | ||
|
|
||
| import com.google.errorprone.BugPattern; | ||
| import com.google.errorprone.VisitorState; | ||
| import com.google.errorprone.bugpatterns.BugChecker.MethodInvocationTreeMatcher; | ||
| import com.google.errorprone.fixes.SuggestedFix; | ||
| import com.google.errorprone.matchers.Description; | ||
| import com.google.errorprone.matchers.Matcher; | ||
| import com.google.errorprone.util.ASTHelpers; | ||
| import com.sun.source.tree.ExpressionTree; | ||
| import com.sun.source.tree.MethodInvocationTree; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
|
|
||
| /** | ||
| * ErrorProne checker to generate warning when method expecting distinct varargs is invoked with | ||
| * same variable argument. | ||
| */ | ||
| @BugPattern( | ||
| name = "DistinctVarargsChecker", | ||
| summary = "Method expects distinct arguments at some/all positions", | ||
| severity = WARNING) | ||
| public final class DistinctVarargsChecker extends BugChecker | ||
| implements MethodInvocationTreeMatcher { | ||
|
|
||
| private static final Matcher<ExpressionTree> IMMUTABLE_SET_VARARGS_MATCHER = | ||
| anyOf( | ||
| staticMethod().onClass("com.google.common.collect.ImmutableSet").named("of"), | ||
| staticMethod().onClass("com.google.common.collect.ImmutableSortedSet").named("of")); | ||
| private static final Matcher<ExpressionTree> ALL_DISTINCT_ARG_MATCHER = | ||
| anyOf( | ||
| staticMethod() | ||
| .onClass("com.google.common.util.concurrent.Futures") | ||
| .withSignature( | ||
| "<V>whenAllSucceed(com.google.common.util.concurrent.ListenableFuture<? extends" | ||
| + " V>...)"), | ||
| staticMethod() | ||
| .onClass("com.google.common.util.concurrent.Futures") | ||
| .withSignature( | ||
| "<V>whenAllComplete(com.google.common.util.concurrent.ListenableFuture<? extends" | ||
| + " V>...)"), | ||
| staticMethod() | ||
| .onClass("com.google.common.collect.Ordering") | ||
| .withSignature("<T>explicit(T,T...)")); | ||
| private static final Matcher<ExpressionTree> EVEN_PARITY_DISTINCT_ARG_MATCHER = | ||
| anyOf( | ||
| staticMethod().onClass("com.google.common.collect.ImmutableMap").named("of"), | ||
| staticMethod().onClass("com.google.common.collect.ImmutableSortedMap").named("of")); | ||
| private static final Matcher<ExpressionTree> EVEN_AND_ODD_PARITY_DISTINCT_ARG_MATCHER = | ||
| staticMethod().onClass("com.google.common.collect.ImmutableBiMap").named("of"); | ||
|
|
||
| @Override | ||
| public Description matchMethodInvocation(MethodInvocationTree tree, VisitorState state) { | ||
| // For ImmutableSet and ImmutableSortedSet fix can be constructed. For all other methods, | ||
| // non-distinct arguments will result in the runtime exceptions. | ||
| if (IMMUTABLE_SET_VARARGS_MATCHER.matches(tree, state)) { | ||
| return checkDistinctArgumentsWithFix(tree, state); | ||
| } | ||
| if (ALL_DISTINCT_ARG_MATCHER.matches(tree, state)) { | ||
| return checkDistinctArguments(tree, tree.getArguments()); | ||
| } | ||
| if (EVEN_PARITY_DISTINCT_ARG_MATCHER.matches(tree, state)) { | ||
| List<ExpressionTree> arguments = new ArrayList<>(); | ||
| for (int index = 0; index < tree.getArguments().size(); index += 2) { | ||
| arguments.add(tree.getArguments().get(index)); | ||
| } | ||
| return checkDistinctArguments(tree, arguments); | ||
| } | ||
| if (EVEN_AND_ODD_PARITY_DISTINCT_ARG_MATCHER.matches(tree, state)) { | ||
| List<ExpressionTree> evenParityArguments = new ArrayList<>(); | ||
| List<ExpressionTree> oddParityArguments = new ArrayList<>(); | ||
| for (int index = 0; index < tree.getArguments().size(); index++) { | ||
| if (index % 2 == 0) { | ||
| evenParityArguments.add(tree.getArguments().get(index)); | ||
| } else { | ||
| oddParityArguments.add(tree.getArguments().get(index)); | ||
| } | ||
| } | ||
| return checkDistinctArguments(tree, evenParityArguments, oddParityArguments); | ||
| } | ||
| return Description.NO_MATCH; | ||
| } | ||
|
|
||
| private Description checkDistinctArgumentsWithFix(MethodInvocationTree tree, VisitorState state) { | ||
| SuggestedFix.Builder suggestedFix = SuggestedFix.builder(); | ||
| for (int index = 1; index < tree.getArguments().size(); index++) { | ||
| boolean isDistinctArgument = true; | ||
| for (int prevElementIndex = 0; prevElementIndex < index; prevElementIndex++) { | ||
| if (ASTHelpers.sameVariable( | ||
| tree.getArguments().get(index), tree.getArguments().get(prevElementIndex))) { | ||
| isDistinctArgument = false; | ||
| break; | ||
| } | ||
| } | ||
| if (!isDistinctArgument) { | ||
| suggestedFix.merge( | ||
| SuggestedFix.replace( | ||
| state.getEndPosition(tree.getArguments().get(index - 1)), | ||
| state.getEndPosition(tree.getArguments().get(index)), | ||
| "")); | ||
| } | ||
| } | ||
| if (suggestedFix.isEmpty()) { | ||
| return Description.NO_MATCH; | ||
| } | ||
| return describeMatch(tree, suggestedFix.build()); | ||
| } | ||
|
|
||
| private Description checkDistinctArguments( | ||
| MethodInvocationTree tree, List<? extends ExpressionTree>... argumentsList) { | ||
| for (List<? extends ExpressionTree> arguments : argumentsList) { | ||
| for (int firstArgumentIndex = 0; | ||
| firstArgumentIndex < arguments.size(); | ||
| firstArgumentIndex++) { | ||
| for (int secondArgumentIndex = firstArgumentIndex + 1; | ||
| secondArgumentIndex < arguments.size(); | ||
| secondArgumentIndex++) { | ||
| if (ASTHelpers.sameVariable( | ||
| arguments.get(firstArgumentIndex), arguments.get(secondArgumentIndex))) { | ||
| return describeMatch(tree); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| return Description.NO_MATCH; | ||
| } | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
206 changes: 206 additions & 0 deletions
206
core/src/test/java/com/google/errorprone/bugpatterns/DistinctVarargsCheckerTest.java
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,206 @@ | ||
| /* | ||
| * Copyright 2021 The Error Prone Authors. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| package com.google.errorprone.bugpatterns; | ||
|
|
||
| import com.google.errorprone.BugCheckerRefactoringTestHelper; | ||
| import com.google.errorprone.CompilationTestHelper; | ||
| import org.junit.Test; | ||
| import org.junit.runner.RunWith; | ||
| import org.junit.runners.JUnit4; | ||
|
|
||
| /** {@link DistinctVarargsChecker}Test */ | ||
| @RunWith(JUnit4.class) | ||
| public class DistinctVarargsCheckerTest { | ||
|
|
||
| private final CompilationTestHelper compilationHelper = | ||
| CompilationTestHelper.newInstance(DistinctVarargsChecker.class, getClass()); | ||
| private final BugCheckerRefactoringTestHelper refactoringHelper = | ||
| BugCheckerRefactoringTestHelper.newInstance(DistinctVarargsChecker.class, getClass()); | ||
|
|
||
| @Test | ||
| public void distinctVarargsChecker_sameVariableInFuturesVaragsMethods_shouldFlag() { | ||
| compilationHelper | ||
| .addSourceLines( | ||
| "Test.java", | ||
| "import com.google.common.util.concurrent.Futures;", | ||
| "import com.google.common.util.concurrent.ListenableFuture;", | ||
| "public class Test {", | ||
| " void testFunction() {", | ||
| " ListenableFuture firstFuture = null, secondFuture = null;", | ||
| " // BUG: Diagnostic contains: DistinctVarargsChecker", | ||
| " Futures.whenAllSucceed(firstFuture, firstFuture);", | ||
| " // BUG: Diagnostic contains: DistinctVarargsChecker", | ||
| " Futures.whenAllSucceed(firstFuture, firstFuture, secondFuture);", | ||
| " // BUG: Diagnostic contains: DistinctVarargsChecker", | ||
| " Futures.whenAllComplete(firstFuture, firstFuture);", | ||
| " // BUG: Diagnostic contains: DistinctVarargsChecker", | ||
| " Futures.whenAllComplete(firstFuture, firstFuture, secondFuture);", | ||
| " }", | ||
| "}") | ||
| .doTest(); | ||
| } | ||
|
|
||
| @Test | ||
| public void distinctVarargsCheckerdifferentVariableInFuturesVaragsMethods_shouldNotFlag() { | ||
| compilationHelper | ||
| .addSourceLines( | ||
| "Test.java", | ||
| "import com.google.common.util.concurrent.Futures;", | ||
| "import com.google.common.util.concurrent.ListenableFuture;", | ||
| "public class Test {", | ||
| " void testFunction() {", | ||
| " ListenableFuture firstFuture = null, secondFuture = null;", | ||
| " Futures.whenAllComplete(firstFuture);", | ||
| " Futures.whenAllSucceed(firstFuture, secondFuture);", | ||
| " Futures.whenAllComplete(firstFuture);", | ||
| " Futures.whenAllComplete(firstFuture, secondFuture);", | ||
| " }", | ||
| "}") | ||
| .doTest(); | ||
| } | ||
|
|
||
| @Test | ||
| public void distinctVarargsChecker_sameVariableInGuavaVarargMethods_shouldFlag() { | ||
| compilationHelper | ||
| .addSourceLines( | ||
| "Test.java", | ||
| "import com.google.common.collect.Ordering;", | ||
| "import com.google.common.collect.ImmutableBiMap;", | ||
| "import com.google.common.collect.ImmutableMap;", | ||
| "import com.google.common.collect.ImmutableSortedMap;", | ||
| "import com.google.common.collect.ImmutableSet;", | ||
| "import com.google.common.collect.ImmutableSortedSet;", | ||
| "public class Test {", | ||
| " void testFunction() {", | ||
| " int first = 1, second = 2;", | ||
| " // BUG: Diagnostic contains: DistinctVarargsChecker", | ||
| " Ordering.explicit(first, first);", | ||
| " // BUG: Diagnostic contains: DistinctVarargsChecker", | ||
| " Ordering.explicit(first, first, second);", | ||
| " // BUG: Diagnostic contains: DistinctVarargsChecker", | ||
| " ImmutableMap.of(first, second, first, second);", | ||
| " // BUG: Diagnostic contains: DistinctVarargsChecker", | ||
| " ImmutableSortedMap.of(first, second, first, second);", | ||
| " // BUG: Diagnostic contains: DistinctVarargsChecker", | ||
| " ImmutableBiMap.of(first, second, first, second);", | ||
| " // BUG: Diagnostic contains: DistinctVarargsChecker", | ||
| " ImmutableBiMap.of(first, second, second, second);", | ||
| " // BUG: Diagnostic contains: DistinctVarargsChecker", | ||
| " ImmutableSet.of(first, first);", | ||
| " // BUG: Diagnostic contains: DistinctVarargsChecker", | ||
| " ImmutableSet.of(first, first, second);", | ||
| " // BUG: Diagnostic contains: DistinctVarargsChecker", | ||
| " ImmutableSortedSet.of(first, first);", | ||
| " // BUG: Diagnostic contains: DistinctVarargsChecker", | ||
| " ImmutableSortedSet.of(first, first, second);", | ||
| " }", | ||
| "}") | ||
| .doTest(); | ||
| } | ||
|
|
||
| @Test | ||
| public void distinctVarargsChecker_differentVariableInGuavaVarargMethods_shouldNotFlag() { | ||
| compilationHelper | ||
| .addSourceLines( | ||
| "Test.java", | ||
| "import com.google.common.collect.Ordering;", | ||
| "import com.google.common.collect.ImmutableBiMap;", | ||
| "import com.google.common.collect.ImmutableMap;", | ||
| "import com.google.common.collect.ImmutableSortedMap;", | ||
| "import com.google.common.collect.ImmutableSet;", | ||
| "import com.google.common.collect.ImmutableSortedSet;", | ||
| "public class Test {", | ||
| " void testFunction() {", | ||
| " int first = 1, second = 2, third = 3, fourth = 4;", | ||
| " Ordering.explicit(first);", | ||
| " Ordering.explicit(first, second);", | ||
| " ImmutableMap.of(first, second);", | ||
| " ImmutableSortedMap.of(first, second);", | ||
| " ImmutableBiMap.of(first, second, third, fourth);", | ||
| " ImmutableSet.of(first);", | ||
| " ImmutableSet.of(first, second);", | ||
| " ImmutableSortedSet.of(first);", | ||
| " ImmutableSortedSet.of(first, second);", | ||
| " }", | ||
| "}") | ||
| .doTest(); | ||
| } | ||
|
|
||
| @Test | ||
| public void distinctVarargsChecker_sameVariableInImmutableSetVarargsMethod_shouldRefactor() { | ||
| refactoringHelper | ||
| .addInputLines( | ||
| "Test.java", | ||
| "import com.google.common.collect.ImmutableSet;", | ||
| "import com.google.common.collect.ImmutableSortedSet;", | ||
| "public class Test {", | ||
| " void testFunction() {", | ||
| " int first = 1, second = 2;", | ||
| " ImmutableSet.of(first, first);", | ||
| " ImmutableSet.of(first, first, second);", | ||
| " ImmutableSortedSet.of(first, first);", | ||
| " ImmutableSortedSet.of(first, first, second);", | ||
| " }", | ||
| "}") | ||
| .addOutputLines( | ||
| "Test.java", | ||
| "import com.google.common.collect.ImmutableSet;", | ||
| "import com.google.common.collect.ImmutableSortedSet;", | ||
| "public class Test {", | ||
| " void testFunction() {", | ||
| " int first = 1, second = 2;", | ||
| " ImmutableSet.of(first);", | ||
| " ImmutableSet.of(first, second);", | ||
| " ImmutableSortedSet.of(first);", | ||
| " ImmutableSortedSet.of(first, second);", | ||
| " }", | ||
| "}") | ||
| .doTest(); | ||
| } | ||
|
|
||
| @Test | ||
| public void distinctVarargsChecker_differentVarsInImmutableSetVarargsMethod_shouldNotRefactor() { | ||
| refactoringHelper | ||
| .addInputLines( | ||
| "Test.java", | ||
| "import com.google.common.collect.ImmutableSet;", | ||
| "import com.google.common.collect.ImmutableSortedSet;", | ||
| "public class Test {", | ||
| " void testFunction() {", | ||
| " int first = 1, second = 2;", | ||
| " ImmutableSet.of(first);", | ||
| " ImmutableSet.of(first, second);", | ||
| " ImmutableSortedSet.of(first);", | ||
| " ImmutableSortedSet.of(first, second);", | ||
| " }", | ||
| "}") | ||
| .addOutputLines( | ||
| "Test.java", | ||
| "import com.google.common.collect.ImmutableSet;", | ||
| "import com.google.common.collect.ImmutableSortedSet;", | ||
| "public class Test {", | ||
| " void testFunction() {", | ||
| " int first = 1, second = 2;", | ||
| " ImmutableSet.of(first);", | ||
| " ImmutableSet.of(first, second);", | ||
| " ImmutableSortedSet.of(first);", | ||
| " ImmutableSortedSet.of(first, second);", | ||
| " }", | ||
| "}") | ||
| .doTest(); | ||
| } | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,18 @@ | ||
| Various methods which take variable-length arguments throw the runtime | ||
| exceptions like `IllegalArgumentException` when the arguments are not distinct. | ||
|
|
||
| This checker warns on using the non-distinct parameters in various varargs | ||
| method when the usage is redundant or will either result in the runtime | ||
| exception. | ||
|
|
||
| Bad: | ||
|
|
||
| ```java | ||
| ImmutableSet.of(first, second, second, third); | ||
| ``` | ||
|
|
||
| Good: | ||
|
|
||
| ```java | ||
| ImmutableSet.of(first, second, third); | ||
| ``` |