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Populate static receiver field for javasrc2cpg #5610

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Populate static receiver field for javasrc2cpg #5610

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a9ab450
Populate static receiver field for javasrc2cpg
johannescoetzee Jul 25, 2025
ceec5cc
Fix formatting
johannescoetzee Jul 28, 2025
3a46712
Add tests for static calls on an instance
johannescoetzee Jul 29, 2025
1092fe7
Merge branch 'master' into johannes/javasrc-static-receiver
johannescoetzee Aug 4, 2025
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1 change: 1 addition & 0 deletions build.sbt
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@ name := "joern"
ThisBuild / organization := "io.joern"
ThisBuild / scalaVersion := "3.6.4"


val cpgVersion = "1.7.46"

lazy val joerncli = Projects.joerncli
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4 changes: 3 additions & 1 deletion ...ain/scala/io/joern/javasrc2cpg/astcreation/expressions/AstForCallExpressionsCreator.scala
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Expand Up @@ -81,7 +81,8 @@ trait AstForCallExpressionsCreator { this: AstCreator =>
.toList
}

val receiverType = scopeAsts.rootType.filter(_ != TypeConstants.Any).orElse(receiverTypeOption)
val receiverType = scopeAsts.rootType.filter(_ != TypeConstants.Any).orElse(receiverTypeOption)
val staticReceiver = Option.when(dispatchType == DispatchTypes.STATIC_DISPATCH)(receiverType).flatten

val argumentsCode = getArgumentCodeString(call.getArguments)
val codePrefix = scopeAsts.headOption
Expand All @@ -103,6 +104,7 @@ trait AstForCallExpressionsCreator { this: AstCreator =>
.lineNumber(line(call))
.columnNumber(column(call))
.typeFullName(expressionTypeFullName.getOrElse(defaultTypeFallback()))
.staticReceiver(staticReceiver)

callAst(callRoot, argumentAsts, scopeAsts.headOption)
}
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132 changes: 130 additions & 2 deletions joern-cli/frontends/javasrc2cpg/src/test/scala/io/joern/javasrc2cpg/querying/CallTests.scala
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Expand Up @@ -62,7 +62,10 @@ class NewCallTests extends JavaSrcCode2CpgFixture {
|
|""".stripMargin)

cpg.call.name("valueOf").methodFullName.l shouldBe List("java.lang.String.valueOf:java.lang.String(boolean)")
inside(cpg.call.name("valueOf").l) { case List(valueOfCall) =>
valueOfCall.methodFullName shouldBe "java.lang.String.valueOf:java.lang.String(boolean)"
valueOfCall.staticReceiver shouldBe Some("java.lang.String")
}
}

"they are instance methods imported from java.lang.* should be resolved" in {
Expand Down Expand Up @@ -131,7 +134,132 @@ class NewCallTests extends JavaSrcCode2CpgFixture {
|}
|""".stripMargin)

cpg.call.name("foo").methodFullName.l shouldBe List("foo.Foo.foo:java.lang.String()")
inside(cpg.call.name("foo").l) { case List(fooCall) =>
fooCall.methodFullName shouldBe "foo.Foo.foo:java.lang.String()"
fooCall.staticReceiver shouldBe Some("foo.Foo")
}
}

"calls to inherited static methods" should {
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Please also add a test where the static method is called on an instance and not directly via the class name.

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Will do! I didn't know that was a thing in Java as well.

val cpg = code("""
|package foo;
|
|class Foo {
| public static String foo() {
| return "FOO";
| }
|}
|""".stripMargin)
.moreCode("""
|package bar;
|
|import foo.Foo;
|
|class Bar extends Foo { }
|""".stripMargin)
.moreCode("""
|package baz;
|
|import bar.Bar;
|
|class Baz {
| void test() {
| Bar.foo();
| }
|}
|""".stripMargin)

"have the correct staticReceiver set" in {
inside(cpg.call.name("foo").l) { case List(fooCall) =>
fooCall.methodFullName shouldBe "bar.Bar.foo:java.lang.String()"
fooCall.staticReceiver shouldBe Some("bar.Bar")
}
}
}

"calls to inherited static methods via an instance" should {
val cpg = code("""
|package foo;
|
|class Foo {
| public static String foo() {
| return "FOO";
| }
|}
|""".stripMargin)
.moreCode("""
|package bar;
|
|import foo.Foo;
|
|class Bar extends Foo {
| public static String foo() {
| return "BAR";
| }
|}
|""".stripMargin)
.moreCode("""
|package baz;
|
|import bar.Bar;
|
|class Baz {
| void test(Bar b) {
| b.foo();
| }
|}
|""".stripMargin)

"have the correct staticReceiver set" in {
inside(cpg.call.name("foo").l) { case List(fooCall) =>
fooCall.dispatchType shouldBe DispatchTypes.STATIC_DISPATCH
fooCall.methodFullName shouldBe "bar.Bar.foo:java.lang.String()"
fooCall.staticReceiver shouldBe Some("bar.Bar")
}
}
}

"calls to overridden static methods via an instance" should {
val cpg = code("""
|package foo;
|
|class Foo {
| public static String foo() {
| return "FOO";
| }
|}
|""".stripMargin)
.moreCode("""
|package bar;
|
|import foo.Foo;
|
|class Bar extends Foo {
| public static String foo() {
| return "BAR";
| }
|}
|""".stripMargin)
.moreCode("""
|package baz;
|
|import bar.Bar;
|import foo.Foo;
|
|class Baz {
| void test(Foo f) {
| f.foo();
| }
|}
|""".stripMargin)

"have the correct staticReceiver set" in {
inside(cpg.call.name("foo").l) { case List(fooCall) =>
fooCall.dispatchType shouldBe DispatchTypes.STATIC_DISPATCH
fooCall.methodFullName shouldBe "foo.Foo.foo:java.lang.String()"
fooCall.staticReceiver shouldBe Some("foo.Foo")
}
}
}

"calls with unresolved receivers should have the correct fullnames" in {
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