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Stephan Brandauer
authored
Merge pull request github#14795 from github/kaeluka/skip-this-qualifier-ctor-candidates
Java: Automodel Extraction: Remove Qualifier Endpoints of Constructors
2 parents 30f0b8a + 84e58b7 commit 69ab389

8 files changed

+40
-21
lines changed

java/ql/automodel/src/AutomodelApplicationModeCharacteristics.qll

Lines changed: 3 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -30,7 +30,9 @@ newtype TApplicationModeEndpoint =
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arg.asExpr() = argExpr and call = argExpr.getCall() and not argExpr.isVararg()
3131
)
3232
} or
33-
TInstanceArgument(Call call, DataFlow::Node arg) { arg = DataFlow::getInstanceArgument(call) } or
33+
TInstanceArgument(Call call, DataFlow::Node arg) {
34+
arg = DataFlow::getInstanceArgument(call) and not call instanceof ConstructorCall
35+
} or
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TImplicitVarargsArray(Call call, DataFlow::Node arg, int idx) {
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exists(Argument argExpr |
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arg.asExpr() = argExpr and

java/ql/automodel/src/AutomodelFrameworkModeCharacteristics.qll

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -25,7 +25,7 @@ newtype JavaRelatedLocationType =
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2626
newtype TFrameworkModeEndpoint =
2727
TExplicitParameter(Parameter p) or
28-
TQualifier(Callable c) or
28+
TQualifier(Callable c) { not c instanceof Constructor } or
2929
TReturnValue(Callable c) or
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TOverridableParameter(Method m, Parameter p) {
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p.getCallable() = m and

java/ql/automodel/test/AutomodelApplicationModeExtraction/AutomodelApplicationModeExtractCandidates.expected

Lines changed: 11 additions & 11 deletions
Large diffs are not rendered by default.
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,3 @@
1-
| Test.java:47:10:49:3 | compareTo(...) | known sanitizer\nrelated locations: $@, $@, $@.\nmetadata: $@, $@, $@, $@, $@, $@, $@, $@, $@. | Test.java:47:10:49:3 | compareTo(...) | CallContext | Test.java:47:10:49:3 | compareTo(...) | MethodDoc | Test.java:47:10:49:3 | compareTo(...) | ClassDoc | file://java.io:1:1:1:1 | java.io | package | file://File:1:1:1:1 | File | type | file://true:1:1:1:1 | true | subtypes | file://compareTo:1:1:1:1 | compareTo | name | file://(File):1:1:1:1 | (File) | signature | file://:1:1:1:1 | | input | file://ReturnValue:1:1:1:1 | ReturnValue | output | file://false:1:1:1:1 | false | isVarargsArray | file://sourceModel:1:1:1:1 | sourceModel | extensibleType |
2-
| Test.java:48:4:48:5 | f2 | known non-sink\nrelated locations: $@, $@, $@.\nmetadata: $@, $@, $@, $@, $@, $@, $@, $@, $@. | Test.java:47:10:49:3 | compareTo(...) | CallContext | Test.java:48:4:48:5 | f2 | MethodDoc | Test.java:48:4:48:5 | f2 | ClassDoc | file://java.io:1:1:1:1 | java.io | package | file://File:1:1:1:1 | File | type | file://true:1:1:1:1 | true | subtypes | file://compareTo:1:1:1:1 | compareTo | name | file://(File):1:1:1:1 | (File) | signature | file://Argument[0]:1:1:1:1 | Argument[0] | input | file://:1:1:1:1 | | output | file://false:1:1:1:1 | false | isVarargsArray | file://sinkModel:1:1:1:1 | sinkModel | extensibleType |
3-
| Test.java:54:4:54:4 | p | taint step\nrelated locations: $@, $@, $@.\nmetadata: $@, $@, $@, $@, $@, $@, $@, $@, $@. | Test.java:53:3:58:3 | walk(...) | CallContext | Test.java:54:4:54:4 | p | MethodDoc | Test.java:54:4:54:4 | p | ClassDoc | file://java.nio.file:1:1:1:1 | java.nio.file | package | file://Files:1:1:1:1 | Files | type | file://false:1:1:1:1 | false | subtypes | file://walk:1:1:1:1 | walk | name | file://(Path,FileVisitOption[]):1:1:1:1 | (Path,FileVisitOption[]) | signature | file://Argument[0]:1:1:1:1 | Argument[0] | input | file://:1:1:1:1 | | output | file://false:1:1:1:1 | false | isVarargsArray | file://sinkModel:1:1:1:1 | sinkModel | extensibleType |
4-
| Test.java:66:7:66:18 | this <constr(this)> | exception\nrelated locations: $@, $@, $@.\nmetadata: $@, $@, $@, $@, $@, $@, $@, $@, $@. | Test.java:66:7:66:18 | super(...) | CallContext | Test.java:66:7:66:18 | super(...) | MethodDoc | Test.java:66:7:66:18 | super(...) | ClassDoc | file://java.lang:1:1:1:1 | java.lang | package | file://Exception:1:1:1:1 | Exception | type | file://true:1:1:1:1 | true | subtypes | file://Exception:1:1:1:1 | Exception | name | file://():1:1:1:1 | () | signature | file://Argument[this]:1:1:1:1 | Argument[this] | input | file://:1:1:1:1 | | output | file://false:1:1:1:1 | false | isVarargsArray | file://sinkModel:1:1:1:1 | sinkModel | extensibleType |
1+
| Test.java:48:10:50:3 | compareTo(...) | known sanitizer\nrelated locations: $@, $@, $@.\nmetadata: $@, $@, $@, $@, $@, $@, $@, $@, $@. | Test.java:48:10:50:3 | compareTo(...) | CallContext | Test.java:48:10:50:3 | compareTo(...) | MethodDoc | Test.java:48:10:50:3 | compareTo(...) | ClassDoc | file://java.io:1:1:1:1 | java.io | package | file://File:1:1:1:1 | File | type | file://true:1:1:1:1 | true | subtypes | file://compareTo:1:1:1:1 | compareTo | name | file://(File):1:1:1:1 | (File) | signature | file://:1:1:1:1 | | input | file://ReturnValue:1:1:1:1 | ReturnValue | output | file://false:1:1:1:1 | false | isVarargsArray | file://sourceModel:1:1:1:1 | sourceModel | extensibleType |
2+
| Test.java:49:4:49:5 | f2 | known non-sink\nrelated locations: $@, $@, $@.\nmetadata: $@, $@, $@, $@, $@, $@, $@, $@, $@. | Test.java:48:10:50:3 | compareTo(...) | CallContext | Test.java:49:4:49:5 | f2 | MethodDoc | Test.java:49:4:49:5 | f2 | ClassDoc | file://java.io:1:1:1:1 | java.io | package | file://File:1:1:1:1 | File | type | file://true:1:1:1:1 | true | subtypes | file://compareTo:1:1:1:1 | compareTo | name | file://(File):1:1:1:1 | (File) | signature | file://Argument[0]:1:1:1:1 | Argument[0] | input | file://:1:1:1:1 | | output | file://false:1:1:1:1 | false | isVarargsArray | file://sinkModel:1:1:1:1 | sinkModel | extensibleType |
3+
| Test.java:55:4:55:4 | p | taint step\nrelated locations: $@, $@, $@.\nmetadata: $@, $@, $@, $@, $@, $@, $@, $@, $@. | Test.java:54:3:59:3 | walk(...) | CallContext | Test.java:55:4:55:4 | p | MethodDoc | Test.java:55:4:55:4 | p | ClassDoc | file://java.nio.file:1:1:1:1 | java.nio.file | package | file://Files:1:1:1:1 | Files | type | file://false:1:1:1:1 | false | subtypes | file://walk:1:1:1:1 | walk | name | file://(Path,FileVisitOption[]):1:1:1:1 | (Path,FileVisitOption[]) | signature | file://Argument[0]:1:1:1:1 | Argument[0] | input | file://:1:1:1:1 | | output | file://false:1:1:1:1 | false | isVarargsArray | file://sinkModel:1:1:1:1 | sinkModel | extensibleType |
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
| Test.java:28:4:28:9 | source | path-injection\nrelated locations: $@, $@, $@.\nmetadata: $@, $@, $@, $@, $@, $@, $@, $@, $@. | Test.java:27:3:31:3 | copy(...) | CallContext | Test.java:28:4:28:9 | source | MethodDoc | Test.java:28:4:28:9 | source | ClassDoc | file://java.nio.file:1:1:1:1 | java.nio.file | package | file://Files:1:1:1:1 | Files | type | file://false:1:1:1:1 | false | subtypes | file://copy:1:1:1:1 | copy | name | file://(Path,Path,CopyOption[]):1:1:1:1 | (Path,Path,CopyOption[]) | signature | file://Argument[0]:1:1:1:1 | Argument[0] | input | file://:1:1:1:1 | | output | file://false:1:1:1:1 | false | isVarargsArray | file://sinkModel:1:1:1:1 | sinkModel | extensibleType |
2-
| Test.java:29:4:29:9 | target | path-injection\nrelated locations: $@, $@, $@.\nmetadata: $@, $@, $@, $@, $@, $@, $@, $@, $@. | Test.java:27:3:31:3 | copy(...) | CallContext | Test.java:29:4:29:9 | target | MethodDoc | Test.java:29:4:29:9 | target | ClassDoc | file://java.nio.file:1:1:1:1 | java.nio.file | package | file://Files:1:1:1:1 | Files | type | file://false:1:1:1:1 | false | subtypes | file://copy:1:1:1:1 | copy | name | file://(Path,Path,CopyOption[]):1:1:1:1 | (Path,Path,CopyOption[]) | signature | file://Argument[1]:1:1:1:1 | Argument[1] | input | file://:1:1:1:1 | | output | file://false:1:1:1:1 | false | isVarargsArray | file://sinkModel:1:1:1:1 | sinkModel | extensibleType |
3-
| Test.java:36:4:36:11 | openPath | path-injection\nrelated locations: $@, $@, $@.\nmetadata: $@, $@, $@, $@, $@, $@, $@, $@, $@. | Test.java:35:10:37:3 | newInputStream(...) | CallContext | Test.java:36:4:36:11 | openPath | MethodDoc | Test.java:36:4:36:11 | openPath | ClassDoc | file://java.nio.file:1:1:1:1 | java.nio.file | package | file://Files:1:1:1:1 | Files | type | file://false:1:1:1:1 | false | subtypes | file://newInputStream:1:1:1:1 | newInputStream | name | file://(Path,OpenOption[]):1:1:1:1 | (Path,OpenOption[]) | signature | file://Argument[0]:1:1:1:1 | Argument[0] | input | file://:1:1:1:1 | | output | file://false:1:1:1:1 | false | isVarargsArray | file://sinkModel:1:1:1:1 | sinkModel | extensibleType |
4-
| Test.java:62:3:62:20 | getInputStream(...) | remote\nrelated locations: $@, $@, $@.\nmetadata: $@, $@, $@, $@, $@, $@, $@, $@, $@. | Test.java:62:3:62:20 | getInputStream(...) | CallContext | Test.java:62:3:62:20 | getInputStream(...) | MethodDoc | Test.java:62:3:62:20 | getInputStream(...) | ClassDoc | file://java.net:1:1:1:1 | java.net | package | file://URLConnection:1:1:1:1 | URLConnection | type | file://true:1:1:1:1 | true | subtypes | file://getInputStream:1:1:1:1 | getInputStream | name | file://():1:1:1:1 | () | signature | file://:1:1:1:1 | | input | file://ReturnValue:1:1:1:1 | ReturnValue | output | file://false:1:1:1:1 | false | isVarargsArray | file://sourceModel:1:1:1:1 | sourceModel | extensibleType |
1+
| Test.java:29:4:29:9 | source | path-injection\nrelated locations: $@, $@, $@.\nmetadata: $@, $@, $@, $@, $@, $@, $@, $@, $@. | Test.java:28:3:32:3 | copy(...) | CallContext | Test.java:29:4:29:9 | source | MethodDoc | Test.java:29:4:29:9 | source | ClassDoc | file://java.nio.file:1:1:1:1 | java.nio.file | package | file://Files:1:1:1:1 | Files | type | file://false:1:1:1:1 | false | subtypes | file://copy:1:1:1:1 | copy | name | file://(Path,Path,CopyOption[]):1:1:1:1 | (Path,Path,CopyOption[]) | signature | file://Argument[0]:1:1:1:1 | Argument[0] | input | file://:1:1:1:1 | | output | file://false:1:1:1:1 | false | isVarargsArray | file://sinkModel:1:1:1:1 | sinkModel | extensibleType |
2+
| Test.java:30:4:30:9 | target | path-injection\nrelated locations: $@, $@, $@.\nmetadata: $@, $@, $@, $@, $@, $@, $@, $@, $@. | Test.java:28:3:32:3 | copy(...) | CallContext | Test.java:30:4:30:9 | target | MethodDoc | Test.java:30:4:30:9 | target | ClassDoc | file://java.nio.file:1:1:1:1 | java.nio.file | package | file://Files:1:1:1:1 | Files | type | file://false:1:1:1:1 | false | subtypes | file://copy:1:1:1:1 | copy | name | file://(Path,Path,CopyOption[]):1:1:1:1 | (Path,Path,CopyOption[]) | signature | file://Argument[1]:1:1:1:1 | Argument[1] | input | file://:1:1:1:1 | | output | file://false:1:1:1:1 | false | isVarargsArray | file://sinkModel:1:1:1:1 | sinkModel | extensibleType |
3+
| Test.java:37:4:37:11 | openPath | path-injection\nrelated locations: $@, $@, $@.\nmetadata: $@, $@, $@, $@, $@, $@, $@, $@, $@. | Test.java:36:10:38:3 | newInputStream(...) | CallContext | Test.java:37:4:37:11 | openPath | MethodDoc | Test.java:37:4:37:11 | openPath | ClassDoc | file://java.nio.file:1:1:1:1 | java.nio.file | package | file://Files:1:1:1:1 | Files | type | file://false:1:1:1:1 | false | subtypes | file://newInputStream:1:1:1:1 | newInputStream | name | file://(Path,OpenOption[]):1:1:1:1 | (Path,OpenOption[]) | signature | file://Argument[0]:1:1:1:1 | Argument[0] | input | file://:1:1:1:1 | | output | file://false:1:1:1:1 | false | isVarargsArray | file://sinkModel:1:1:1:1 | sinkModel | extensibleType |
4+
| Test.java:63:3:63:20 | getInputStream(...) | remote\nrelated locations: $@, $@, $@.\nmetadata: $@, $@, $@, $@, $@, $@, $@, $@, $@. | Test.java:63:3:63:20 | getInputStream(...) | CallContext | Test.java:63:3:63:20 | getInputStream(...) | MethodDoc | Test.java:63:3:63:20 | getInputStream(...) | ClassDoc | file://java.net:1:1:1:1 | java.net | package | file://URLConnection:1:1:1:1 | URLConnection | type | file://true:1:1:1:1 | true | subtypes | file://getInputStream:1:1:1:1 | getInputStream | name | file://():1:1:1:1 | () | signature | file://:1:1:1:1 | | input | file://ReturnValue:1:1:1:1 | ReturnValue | output | file://false:1:1:1:1 | false | isVarargsArray | file://sourceModel:1:1:1:1 | sourceModel | extensibleType |

java/ql/automodel/test/AutomodelApplicationModeExtraction/Test.java

Lines changed: 12 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -11,6 +11,7 @@
1111
import java.io.File;
1212
import java.nio.file.FileVisitOption;
1313
import java.net.URLConnection;
14+
import java.util.concurrent.FutureTask;
1415

1516
class Test {
1617
public static void main(String[] args) throws Exception {
@@ -67,4 +68,15 @@ class OverrideTest extends Exception {
6768
public void printStackTrace(PrintWriter writer) { // writer is a source candidate because it overrides an existing method
6869
return;
6970
}
71+
72+
}
73+
74+
class TaskUtils {
75+
public FutureTask getTask() {
76+
FutureTask ft = new FutureTask(() -> {
77+
// ^-- no sink candidate for the `this` qualifier of a constructor
78+
return 42;
79+
});
80+
return ft;
81+
}
7082
}

java/ql/automodel/test/AutomodelFrameworkModeExtraction/AutomodelFrameworkModeExtractCandidates.expected

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -10,6 +10,8 @@
1010
| com/github/codeql/test/PublicClass.java:13:18:13:31 | nonPublicStuff | Related locations: $@, $@.\nmetadata: $@, $@, $@, $@, $@, $@, $@, $@, $@, $@. | com/github/codeql/test/PublicClass.java:13:18:13:31 | nonPublicStuff | MethodDoc | com/github/codeql/test/PublicClass.java:13:18:13:31 | nonPublicStuff | ClassDoc | file://com.github.codeql.test:1:1:1:1 | com.github.codeql.test | package | file://PublicClass:1:1:1:1 | PublicClass | type | file://true:1:1:1:1 | true | subtypes | file://nonPublicStuff:1:1:1:1 | nonPublicStuff | name | file://(String):1:1:1:1 | (String) | signature | file://Argument[this]:1:1:1:1 | Argument[this] | input | file://:1:1:1:1 | | output | file://this:1:1:1:1 | this | parameterName | file://:1:1:1:1 | | alreadyAiModeled | file://sinkModel:1:1:1:1 | sinkModel | extensibleType |
1111
| com/github/codeql/test/PublicClass.java:13:33:13:42 | arg | Related locations: $@, $@.\nmetadata: $@, $@, $@, $@, $@, $@, $@, $@, $@, $@. | com/github/codeql/test/PublicClass.java:13:33:13:42 | arg | MethodDoc | com/github/codeql/test/PublicClass.java:13:33:13:42 | arg | ClassDoc | file://com.github.codeql.test:1:1:1:1 | com.github.codeql.test | package | file://PublicClass:1:1:1:1 | PublicClass | type | file://true:1:1:1:1 | true | subtypes | file://nonPublicStuff:1:1:1:1 | nonPublicStuff | name | file://(String):1:1:1:1 | (String) | signature | file://:1:1:1:1 | | input | file://Parameter[0]:1:1:1:1 | Parameter[0] | output | file://arg:1:1:1:1 | arg | parameterName | file://:1:1:1:1 | | alreadyAiModeled | file://sourceModel:1:1:1:1 | sourceModel | extensibleType |
1212
| com/github/codeql/test/PublicClass.java:13:33:13:42 | arg | Related locations: $@, $@.\nmetadata: $@, $@, $@, $@, $@, $@, $@, $@, $@, $@. | com/github/codeql/test/PublicClass.java:13:33:13:42 | arg | MethodDoc | com/github/codeql/test/PublicClass.java:13:33:13:42 | arg | ClassDoc | file://com.github.codeql.test:1:1:1:1 | com.github.codeql.test | package | file://PublicClass:1:1:1:1 | PublicClass | type | file://true:1:1:1:1 | true | subtypes | file://nonPublicStuff:1:1:1:1 | nonPublicStuff | name | file://(String):1:1:1:1 | (String) | signature | file://Argument[0]:1:1:1:1 | Argument[0] | input | file://:1:1:1:1 | | output | file://arg:1:1:1:1 | arg | parameterName | file://:1:1:1:1 | | alreadyAiModeled | file://sinkModel:1:1:1:1 | sinkModel | extensibleType |
13+
| com/github/codeql/test/PublicClass.java:22:10:22:20 | PublicClass | Related locations: $@, $@.\nmetadata: $@, $@, $@, $@, $@, $@, $@, $@, $@, $@. | com/github/codeql/test/PublicClass.java:22:10:22:20 | PublicClass | MethodDoc | com/github/codeql/test/PublicClass.java:22:10:22:20 | PublicClass | ClassDoc | file://com.github.codeql.test:1:1:1:1 | com.github.codeql.test | package | file://PublicClass:1:1:1:1 | PublicClass | type | file://true:1:1:1:1 | true | subtypes | file://PublicClass:1:1:1:1 | PublicClass | name | file://(Object):1:1:1:1 | (Object) | signature | file://:1:1:1:1 | | input | file://ReturnValue:1:1:1:1 | ReturnValue | output | file://:1:1:1:1 | | parameterName | file://:1:1:1:1 | | alreadyAiModeled | file://sourceModel:1:1:1:1 | sourceModel | extensibleType |
14+
| com/github/codeql/test/PublicClass.java:22:22:22:33 | input | Related locations: $@, $@.\nmetadata: $@, $@, $@, $@, $@, $@, $@, $@, $@, $@. | com/github/codeql/test/PublicClass.java:22:22:22:33 | input | MethodDoc | com/github/codeql/test/PublicClass.java:22:22:22:33 | input | ClassDoc | file://com.github.codeql.test:1:1:1:1 | com.github.codeql.test | package | file://PublicClass:1:1:1:1 | PublicClass | type | file://true:1:1:1:1 | true | subtypes | file://PublicClass:1:1:1:1 | PublicClass | name | file://(Object):1:1:1:1 | (Object) | signature | file://Argument[0]:1:1:1:1 | Argument[0] | input | file://:1:1:1:1 | | output | file://input:1:1:1:1 | input | parameterName | file://:1:1:1:1 | | alreadyAiModeled | file://sinkModel:1:1:1:1 | sinkModel | extensibleType |
1315
| com/github/codeql/test/PublicInterface.java:4:17:4:21 | stuff | Related locations: $@, $@.\nmetadata: $@, $@, $@, $@, $@, $@, $@, $@, $@, $@. | com/github/codeql/test/PublicInterface.java:4:17:4:21 | stuff | MethodDoc | com/github/codeql/test/PublicInterface.java:4:17:4:21 | stuff | ClassDoc | file://com.github.codeql.test:1:1:1:1 | com.github.codeql.test | package | file://PublicInterface:1:1:1:1 | PublicInterface | type | file://true:1:1:1:1 | true | subtypes | file://stuff:1:1:1:1 | stuff | name | file://(String):1:1:1:1 | (String) | signature | file://:1:1:1:1 | | input | file://Parameter[this]:1:1:1:1 | Parameter[this] | output | file://this:1:1:1:1 | this | parameterName | file://:1:1:1:1 | | alreadyAiModeled | file://sourceModel:1:1:1:1 | sourceModel | extensibleType |
1416
| com/github/codeql/test/PublicInterface.java:4:17:4:21 | stuff | Related locations: $@, $@.\nmetadata: $@, $@, $@, $@, $@, $@, $@, $@, $@, $@. | com/github/codeql/test/PublicInterface.java:4:17:4:21 | stuff | MethodDoc | com/github/codeql/test/PublicInterface.java:4:17:4:21 | stuff | ClassDoc | file://com.github.codeql.test:1:1:1:1 | com.github.codeql.test | package | file://PublicInterface:1:1:1:1 | PublicInterface | type | file://true:1:1:1:1 | true | subtypes | file://stuff:1:1:1:1 | stuff | name | file://(String):1:1:1:1 | (String) | signature | file://:1:1:1:1 | | input | file://ReturnValue:1:1:1:1 | ReturnValue | output | file://:1:1:1:1 | | parameterName | file://:1:1:1:1 | | alreadyAiModeled | file://sourceModel:1:1:1:1 | sourceModel | extensibleType |
1517
| com/github/codeql/test/PublicInterface.java:4:17:4:21 | stuff | Related locations: $@, $@.\nmetadata: $@, $@, $@, $@, $@, $@, $@, $@, $@, $@. | com/github/codeql/test/PublicInterface.java:4:17:4:21 | stuff | MethodDoc | com/github/codeql/test/PublicInterface.java:4:17:4:21 | stuff | ClassDoc | file://com.github.codeql.test:1:1:1:1 | com.github.codeql.test | package | file://PublicInterface:1:1:1:1 | PublicInterface | type | file://true:1:1:1:1 | true | subtypes | file://stuff:1:1:1:1 | stuff | name | file://(String):1:1:1:1 | (String) | signature | file://Argument[this]:1:1:1:1 | Argument[this] | input | file://:1:1:1:1 | | output | file://this:1:1:1:1 | this | parameterName | file://:1:1:1:1 | | alreadyAiModeled | file://sinkModel:1:1:1:1 | sinkModel | extensibleType |

java/ql/automodel/test/AutomodelFrameworkModeExtraction/com/github/codeql/test/PublicClass.java

Lines changed: 4 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -18,4 +18,8 @@ protected void nonPublicStuff(String arg) {
1818
void packagePrivateStuff(String arg) {
1919
System.out.println(arg);
2020
}
21+
22+
public PublicClass(Object input) {
23+
// the `this` qualifier is not a candidate
24+
}
2125
}

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