Handle nested member expression

cpg-core/src/main/kotlin/de/fraunhofer/aisec/cpg/passes/VariableUsageResolver.kt

@@ -310,6 +310,14 @@ open class VariableUsageResolver(ctx: TranslationContext) : SymbolResolverPass(c
     }
 
     protected fun resolveBase(reference: DeclaredReferenceExpression): Declaration? {
+        // We need to check, whether we first need to resolve our own base
+        if (reference is MemberExpression) {
+            val base = reference.base
+            if (base is DeclaredReferenceExpression && base.refersTo == null) {
+                base.refersTo = resolveBase(base)
+            }
+        }
+
         val declaration = scopeManager.resolveReference(reference)
         if (declaration != null) {
             return declaration

cpg-language-go/src/test/kotlin/de/fraunhofer/aisec/cpg/frontends/golang/GoLanguageFrontendTest.kt

@@ -971,4 +971,34 @@ class GoLanguageFrontendTest : BaseTest() {
         assertNotNull(call)
         assertInvokes(call, doInterface)
     }
+
+    @Test
+    fun testFuncOptions() {
+        val topLevel = Path.of("src", "test", "resources", "golang", "options")
+        val result =
+            analyze(
+                listOf(
+                    topLevel.resolve("srv.go").toFile(),
+                    topLevel.resolve("srv_option.go").toFile()
+                ),
+                topLevel,
+                true
+            ) {
+                it.registerLanguage<GoLanguage>()
+            }
+        assertNotNull(result)
+
+        val inner = result.records["inner"]
+        assertNotNull(inner)
+
+        val field = inner.fields["field"]
+        assertNotNull(field)
+
+        val assign = result.assignments.firstOrNull()
+        assertNotNull(assign)
+
+        val mce = assign.target
+        assertIs<MemberExpression>(mce)
+        assertRefersTo(mce, field)
+    }
 }

cpg-language-go/src/test/resources/golang/options/srv.go

@@ -0,0 +1,9 @@
+package options
+
+type srv struct {
+	inner inner
+}
+
+type inner struct {
+	field int
+}

cpg-language-go/src/test/resources/golang/options/srv_option.go

@@ -0,0 +1,9 @@
+package options
+
+type Option func(*srv)
+
+func WithField(a int) Option {
+	return func(s *srv) {
+		s.inner.field = a
+	}
+}