feat: implement Value::TryInto and Reference::TryInto for class vec

classes/JDBC.java

@@ -0,0 +1,23 @@
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.ResultSet;
+import java.sql.Statement;
+
+public class JDBC {
+    public static void main(String ... args) throws Exception {
+        Class.forName("org.h2.Driver");
+        String url = "jdbc:h2:~/test";
+        String user = "sa";
+        String password = "";
+
+        try (Connection connection = DriverManager.getConnection(url, user, password);
+             Statement statement = connection.createStatement();
+             ResultSet resultSet = statement.executeQuery("SELECT H2VERSION()")) {
+
+            if (resultSet.next()) {
+                String version = resultSet.getString(1);
+                System.out.println("H2 Database Version: " + version);
+            }
+        }
+    }
+}

ristretto_classloader/src/reference.rs

@@ -479,6 +479,14 @@ impl TryInto<Vec<f64>> for Reference {
     }
 }
 
+impl TryInto<(Arc<Class>, Vec<Option<Reference>>)> for Reference {
+    type Error = crate::Error;
+
+    fn try_into(self) -> Result<(Arc<Class>, Vec<Option<Reference>>)> {
+        self.to_class_vec()
+    }
+}
+
 impl TryInto<bool> for Reference {
     type Error = crate::Error;
 
@@ -1391,8 +1399,8 @@ mod tests {
         let object = Object::new(class)?;
         object.set_value("value", Value::Int(42))?;
         let value = Value::from(object);
-        let original_value = vec![value];
-        let reference = Reference::try_from((original_class.clone(), original_value.clone()))?;
+        let original_values = vec![value];
+        let reference = Reference::try_from((original_class.clone(), original_values.clone()))?;
         assert!(matches!(reference, Reference::Array(_, _)));
         Ok(())
     }
@@ -1542,6 +1550,22 @@ mod tests {
         Ok(())
     }
 
+    #[tokio::test]
+    async fn test_try_into_class_vec() -> Result<()> {
+        let original_class = Arc::new(Class::new_named("[Ljava/lang/Object;")?);
+        let class_name = "java.lang.Integer";
+        let class = load_class(class_name).await?;
+        let object = Object::new(class.clone())?;
+        object.set_value("value", Value::Int(42))?;
+        let value = Value::from(object);
+        let original_values = vec![value];
+        let reference = Reference::try_from((original_class.clone(), original_values.clone()))?;
+        let (reference_class, reference_values) = reference.try_into()?;
+        assert_eq!(original_class.name(), reference_class.name());
+        assert_eq!(original_values.len(), reference_values.len());
+        Ok(())
+    }
+
     #[tokio::test]
     async fn test_try_into_bool() -> Result<()> {
         let class = load_class("java/lang/Boolean").await?;

ristretto_classloader/src/value.rs

@@ -441,6 +441,15 @@ impl TryInto<Vec<f64>> for Value {
     }
 }
 
+impl TryInto<(Arc<Class>, Vec<Option<Reference>>)> for Value {
+    type Error = crate::Error;
+
+    fn try_into(self) -> Result<(Arc<Class>, Vec<Option<Reference>>)> {
+        let reference: Reference = self.try_into()?;
+        reference.try_into()
+    }
+}
+
 impl TryInto<bool> for Value {
     type Error = crate::Error;
 
@@ -1009,8 +1018,8 @@ mod tests {
         let object = Object::new(class)?;
         object.set_value("value", Value::Int(42))?;
         let value = Value::from(object);
-        let original_value = vec![value];
-        let value = Value::try_from((original_class.clone(), original_value.clone()))?;
+        let original_values = vec![value];
+        let value = Value::try_from((original_class.clone(), original_values.clone()))?;
         assert!(matches!(value, Value::Object(Some(Reference::Array(_, _)))));
         Ok(())
     }
@@ -1170,6 +1179,22 @@ mod tests {
         Ok(())
     }
 
+    #[tokio::test]
+    async fn test_try_into_class_vec() -> Result<()> {
+        let original_class = Arc::new(Class::new_named("[Ljava/lang/Object;")?);
+        let class_name = "java/lang/Integer";
+        let class = load_class(class_name).await?;
+        let object = Object::new(class.clone())?;
+        object.set_value("value", Value::Int(42))?;
+        let value = Value::from(object);
+        let original_values = vec![value];
+        let value = Value::try_from((original_class.clone(), original_values.clone()))?;
+        let (reference_class, reference_values) = value.try_into()?;
+        assert_eq!(original_class.name(), reference_class.name());
+        assert_eq!(original_values.len(), reference_values.len());
+        Ok(())
+    }
+
     #[tokio::test]
     async fn test_try_into_bool() -> Result<()> {
         let value: bool = Value::Int(1).try_into()?;

ristretto_vm/src/native_methods/java/lang/class.rs

@@ -227,7 +227,7 @@ async fn desired_assertion_status_0(
     _thread: Arc<Thread>,
     _arguments: Arguments,
 ) -> Result<Option<Value>> {
-    Ok(Some(Value::Int(0)))
+    Ok(Some(Value::from(false)))
 }
 
 #[async_recursion(?Send)]
@@ -698,7 +698,8 @@ async fn get_name_0(thread: Arc<Thread>, mut arguments: Arguments) -> Result<Opt
     let object = arguments.pop_object()?;
     let class = get_class(&thread, &object).await?;
     let class_name = class.name().replace('/', ".");
-    let value = class_name.to_value();
+    let vm = thread.vm()?;
+    let value = class_name.to_object(&vm).await?;
     Ok(Some(value))
 }
 
@@ -720,18 +721,15 @@ async fn get_permitted_subclasses_0(
     let object = arguments.pop_object()?;
     let _class = get_class(&thread, &object).await?;
     // TODO: add support for sealed classes
-    Ok(None)
+    Ok(Some(Value::Object(None)))
 }
 
 #[async_recursion(?Send)]
 async fn get_primitive_class(
     thread: Arc<Thread>,
     mut arguments: Arguments,
 ) -> Result<Option<Value>> {
-    let Some(Reference::Object(primitive)) = arguments.pop_reference()? else {
-        return Err(InternalError("getPrimitiveClass: no arguments".to_string()));
-    };
-
+    let primitive: Object = arguments.pop_object()?;
     let class_name: String = primitive.try_into()?;
     let vm = thread.vm()?;
     let class = thread.class(class_name).await?;
@@ -944,6 +942,57 @@ mod tests {
         let _ = get_generic_signature_0(thread, Arguments::default()).await;
     }
 
+    #[tokio::test]
+    async fn test_get_interfaces_0() -> Result<()> {
+        let (vm, thread) = crate::test::thread().await?;
+        let class = thread.class("java.lang.String").await?;
+        let object = class.to_object(&vm).await?;
+        let arguments = Arguments::new(vec![object]);
+        let result = get_interfaces_0(thread, arguments).await?;
+        let (class, values) = result.expect("interfaces").try_into()?;
+        assert_eq!(class.name(), "[Ljava/lang/Class;");
+        let mut class_names = Vec::new();
+        for reference in values.into_iter().flatten() {
+            let object = reference.to_object()?;
+            let class_name = object.value("name")?;
+            let class_name: String = class_name.try_into()?;
+            class_names.push(class_name);
+        }
+        assert_eq!(
+            class_names,
+            vec![
+                "java.io.Serializable",
+                "java.lang.Comparable",
+                "java.lang.CharSequence",
+                "java.lang.constant.Constable",
+                "java.lang.constant.ConstantDesc"
+            ]
+        );
+        Ok(())
+    }
+
+    #[tokio::test]
+    async fn test_get_modifiers() -> Result<()> {
+        let (vm, thread) = crate::test::thread().await?;
+        let object = "foo".to_object(&vm).await?;
+        let arguments = Arguments::new(vec![object]);
+        let result = get_modifiers(thread, arguments).await?;
+        let modifiers: i32 = result.expect("modifiers").try_into()?;
+        assert_eq!(modifiers, 17);
+        Ok(())
+    }
+
+    #[tokio::test]
+    async fn test_get_name_0() -> Result<()> {
+        let (vm, thread) = crate::test::thread().await?;
+        let object = "foo".to_object(&vm).await?;
+        let arguments = Arguments::new(vec![object]);
+        let result = get_name_0(thread, arguments).await?;
+        let class_name: String = result.expect("object").try_into()?;
+        assert_eq!(class_name.as_str(), "java.lang.String");
+        Ok(())
+    }
+
     #[tokio::test]
     #[should_panic(
         expected = "not yet implemented: java.lang.Class.getNestHost0()Ljava/lang/Class;"
@@ -962,6 +1011,28 @@ mod tests {
         let _ = get_nest_members_0(thread, Arguments::default()).await;
     }
 
+    #[tokio::test]
+    async fn test_get_permitted_subclasses_0() -> Result<()> {
+        let (vm, thread) = crate::test::thread().await?;
+        let object = "foo".to_object(&vm).await?;
+        let arguments = Arguments::new(vec![object]);
+        let result = get_permitted_subclasses_0(thread, arguments).await?;
+        assert_eq!(result, Some(Value::Object(None)));
+        Ok(())
+    }
+
+    #[tokio::test]
+    async fn test_get_primitive_class() -> Result<()> {
+        let (vm, thread) = crate::test::thread().await?;
+        let object = "int".to_object(&vm).await?;
+        let arguments = Arguments::new(vec![object]);
+        let result = get_primitive_class(thread, arguments).await?;
+        let class_object: Object = result.expect("class").try_into()?;
+        let class_name: String = class_object.value("name")?.try_into()?;
+        assert_eq!(class_name.as_str(), "int");
+        Ok(())
+    }
+
     #[tokio::test]
     #[should_panic(
         expected = "not yet implemented: java.lang.Class.getProtectionDomain0()Ljava/security/ProtectionDomain;"
@@ -1002,6 +1073,38 @@ mod tests {
         Ok(())
     }
 
+    #[tokio::test]
+    async fn test_get_simple_binary_name_0() -> Result<()> {
+        let (_vm, thread) = crate::test::thread().await?;
+        let object = thread
+            .object(
+                "java.util.HashMap$Node",
+                "ILjava/lang/Object;Ljava/lang/Object;Ljava/util/HashMap$Node;",
+                vec![
+                    Value::Int(0),
+                    Value::Object(None),
+                    Value::Object(None),
+                    Value::Object(None),
+                ],
+            )
+            .await?;
+        let arguments = Arguments::new(vec![object]);
+        let result = get_simple_binary_name_0(thread, arguments).await?;
+        let result_object: String = result.expect("string").try_into()?;
+        assert_eq!(result_object.as_str(), "Node");
+        Ok(())
+    }
+
+    #[tokio::test]
+    async fn test_get_simple_binary_name_0_non_inner_class_returns_none() -> Result<()> {
+        let (vm, thread) = crate::test::thread().await?;
+        let object = "foo".to_object(&vm).await?;
+        let arguments = Arguments::new(vec![object]);
+        let result = get_simple_binary_name_0(thread, arguments).await?;
+        assert_eq!(result, Some(Value::Object(None)));
+        Ok(())
+    }
+
     #[tokio::test]
     async fn test_get_superclass() -> Result<()> {
         let (vm, thread) = crate::test::thread().await?;

ristretto_vm/src/thread.rs

@@ -376,7 +376,7 @@
         let class = self.class(class_name).await?;
         let Some(constructor) = class.method("<init>", descriptor) else {
             return Err(InternalError(format!(
-                "No constructor found: {class_name}.<init>({descriptor})"
+                "No constructor found: {class_name}.<init>{descriptor}"
             )));
         };
 

ristretto_vm/tests/jdbc.rs

@@ -0,0 +1,24 @@
+use ristretto_classloader::ClassPath;
+use ristretto_vm::{ConfigurationBuilder, VM};
+use std::path::PathBuf;
+
+#[tokio::test]
+async fn test_jdbc() -> ristretto_vm::Result<()> {
+    let cargo_manifest = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
+    let classes_directory = cargo_manifest.join("..").join("classes");
+    let class_path_entries = [
+        classes_directory.to_string_lossy().to_string(),
+        "https://repo1.maven.org/maven2/com/h2database/h2/2.3.232/h2-2.3.232.jar".to_string(),
+    ]
+    .join(":");
+    let class_path = ClassPath::from(&class_path_entries);
+    let configuration = ConfigurationBuilder::new()
+        .class_path(class_path)
+        .main_class("JDBC")
+        .build()?;
+    let _vm = VM::new(configuration).await?;
+    let _arguments: Vec<&str> = Vec::new();
+    // Temporarily disable this test because it requires the invokedynamic instruction.
+    // let result = vm.invoke_main(arguments).await?;
+    Ok(())
+}