Implemented some more native methods

src/classfile.rs

@@ -854,6 +854,24 @@ impl Into<String> for &AbstractTypeDescription {
 
 impl AbstractTypeDescription {
 
+    pub fn storage_size(&self) -> u8 {
+        match self.array_level {
+            0 => match self.kind {
+                AbstractTypeKind::Void() => 0,
+                AbstractTypeKind::Byte() => 1,
+                AbstractTypeKind::Char() => 2,
+                AbstractTypeKind::Double() => 8,
+                AbstractTypeKind::Float() => 4,
+                AbstractTypeKind::Int() => 4,
+                AbstractTypeKind::Long() => 8,
+                AbstractTypeKind::Short() => 2,
+                AbstractTypeKind::Boolean() => 1,
+                AbstractTypeKind::Classname(_) => 8
+            }
+            _ => 8
+        }
+    }
+
     pub fn super_component(&self) -> Self {
         AbstractTypeDescription {
             array_level: 0,
@@ -927,6 +945,14 @@ impl AbstractTypeDescription {
             kind: AbstractTypeKind::Classname(name.to_string()),
         }
     }
+
+    pub fn extract_class_name(&self) -> &String {
+        match self.kind {
+            AbstractTypeKind::Classname(ref name) => name,
+            _ => unreachable!()
+        }
+    }
+
 }
 
 #[derive(Debug, Eq, PartialEq)] 

src/classstore.rs

@@ -261,6 +261,13 @@ impl ClassStore {
         return self.array_classes.get(type_desc).copied();
     }
 
+    pub fn class_index_for_type(&self, r#type: AbstractTypeDescription) -> Option<usize> {
+        match (r#type.array_level, &r#type.kind) {
+            (0, AbstractTypeKind::Classname(ref name)) => Some(self.class_idx_from_name(name).unwrap()),
+            _ => None
+        }
+    }
+
     pub fn class_ref_for_type(&self, r#type: AbstractTypeDescription) -> Option<ObjectReference> {
         match (r#type.array_level, &r#type.kind) {
             (0, AbstractTypeKind::Classname(ref name)) => {

src/heap_area.rs

@@ -62,6 +62,24 @@ impl HeapArea {
         array_ref
     }
 
+    pub fn decode_java_string(&mut self, string_ref: ObjectReference, class_store: &ClassStore) -> String {
+        let byte_array_reference = self.object_area.get_object_field(string_ref, "value", self.object_area.get_object_class_index(string_ref), class_store).unwrap().expect_reference();
+        let byte_array_length = self.object_area.get_array_length(byte_array_reference);
+
+        let mut utf16_bytes = Vec::with_capacity(byte_array_length / 2);
+        for index in 0..byte_array_length/2 {
+            let i0 = self.object_area.get_array_element(byte_array_reference, (index * 2) as i32).expect_byte();
+            let i1 = self.object_area.get_array_element(byte_array_reference, (index * 2 + 1) as i32).expect_byte();
+
+            let u0 = u8::from_ne_bytes(i0.to_ne_bytes());
+            let u1 = u8::from_ne_bytes(i1.to_ne_bytes());
+
+            utf16_bytes.push(u16::from_ne_bytes([u0, u1]));
+        }
+
+        String::from_utf16(&utf16_bytes).unwrap()
+    }
+
     pub fn make_handmade_string(&mut self, s: &String, class_store: &ClassStore) -> ObjectReference {
         let utf16_bytes = {
             let utf16 = s.encode_utf16();
@@ -713,6 +731,20 @@ impl FieldValue {
         }
     }
 
+    fn expect_reference(&self) -> ObjectReference {
+        match self {
+            Self::Reference(r) => *r,
+            _ => unreachable!()
+        }
+    }
+
+    fn expect_byte(&self) -> i8 {
+        match self {
+            Self::Byte(b) => *b,
+            _ => unreachable!()
+        }
+    }
+
     fn default_for(t: &AbstractTypeDescription) -> Self {
         if t.array_level != 0 {
             return Self::Reference(ObjectReference::NULL);

src/jvm.rs

@@ -474,8 +474,7 @@ impl JVM {
             let class_name = waiting_queue.pop_front().unwrap();
 
             if ! self.class_store.have_class(&class_name) {
-                println!("Loading Class {class_name}");
-                self.load_class(&class_name)?;
+                let new_class_index = self.load_class(&class_name)?;
                 let (file, _) = self.class_store.get_class(&class_name).unwrap();
                 if file.has_super_class() {
                     waiting_queue.push_back(file.get_super_class_name()?.to_string());
@@ -485,6 +484,7 @@ impl JVM {
                     let interface_name = file.gather_class(*interface_index)?;
                     waiting_queue.push_back(interface_name.to_string());
                 }
+                println!("Loaded Class {class_name} ({new_class_index})");
             }
         }
 
@@ -672,7 +672,7 @@ impl JVM {
             let (instruction, offset) = bytecode.next_instruction(frame.instruction_pointer as usize);
             frame.instruction_pointer += offset as u32;
 
-            //println!("{} locals: {:?}", "    ".repeat(frame_index), frame.locals);
+            println!("{} locals: {:?}", "    ".repeat(frame_index), frame.locals);
             println!("{} stack: {:?}", "    ".repeat(frame_index), frame.operand_stack);
             println!("{}{}.{}:{:<10}{instruction:?}\n", "    ".repeat(frame_index), class.get_classname().unwrap(), method.name, frame.instruction_pointer);
 
@@ -1484,6 +1484,19 @@ impl JVM {
                                     array_ref
                                 } else {
                                     let mut test_type = array_type_desc.super_component();
+
+                                    if component_name.len() != 1 {
+                                        let base_type_name = test_type.extract_class_name();
+                                        if ! self.class_store.have_class(base_type_name) {
+                                            frame.instruction_pointer -= offset as u32;
+                                            return Ok(JVMCallbackOperation::LoadClass(base_type_name.to_string()));
+                                        }
+                                        if ! self.class_store.was_init(base_type_name).unwrap() {
+                                            frame.instruction_pointer -= offset as u32;
+                                            return Ok(JVMCallbackOperation::InitClass(base_type_name.to_string()));
+                                        }
+                                    }
+
                                     let mut test_object_ref = self.class_store.class_ref_for_type(test_type.clone()).unwrap();
 
                                     while let Some(new_test_object_ref) = self.class_store.class_ref_for_type(test_type.array()) {
@@ -1844,7 +1857,12 @@ impl JVM {
                     let value = match expected_field_descriptor.as_str() {
                         "J" | "D" => wrap_stackframe_error(class, method, frame.operand_stack.pop_computational_2(0))?,
                         _ => match wrap_stackframe_error(class, method, frame.operand_stack.pop_computational_1(0))? {
-                            StackValue::Int(i) => FieldValue::Int(i),
+                            StackValue::Int(i) => {
+                                match expected_field_descriptor.as_str() {
+                                    "Z" => FieldValue::Boolean(i != 0),
+                                    _ => FieldValue::Int(i)
+                                }
+                            }
                             StackValue::Reference(r) => FieldValue::Reference(r),
                             StackValue::Float(f) => FieldValue::Float(f),
                             StackValue::Byte(b) => FieldValue::Byte(b),

src/native_methods.rs

@@ -1,9 +1,9 @@
-
 use crate::stackframe::StackFrame;
 use crate::heap_area::ObjectReference;
 use crate::heap_area::FieldValue;
 use crate::jvm::wrap_stackframe_error;
 use crate::stackframe::StackValue;
+use crate::iterators::ClassFieldIterator;
 use crate::classfile::{ AbstractTypeDescription, AbstractTypeKind, MethodDescriptor };
 use crate::native_registry::NativeMethodCallable;
 use crate::jvm::JVM;
@@ -328,6 +328,14 @@ impl JavaLangDouble {
     }
 }
 
+struct JavaLangRuntime {}
+
+impl JavaLangRuntime {
+    pub fn available_processors(_jvm: &mut JVM) -> Result<JVMCallbackOperation, Error> {
+        Ok(JVMCallbackOperation::ReturnFrame(FieldValue::Int(1)))
+    }
+}
+
 struct JavaLangStringUTF16 {}
 
 impl JavaLangStringUTF16 {
@@ -339,6 +347,29 @@ impl JavaLangStringUTF16 {
 struct JdkInternalMiscUnsafe {}
 
 impl JdkInternalMiscUnsafe {
+
+    pub fn object_field_offset_1(jvm: &mut JVM) -> Result<JVMCallbackOperation, Error> {
+        // args: Class class, String fieldName
+        let frame     = {
+            let frame_index = jvm.stack_frames.len() - 1;
+            &mut jvm.stack_frames[frame_index]
+        };
+
+        let class_object_reference = frame.load_local_reference(1).unwrap();
+        let class_descriptor = jvm.heap_area.object_area.get_class_ref_native_class_name(class_object_reference, &jvm.class_store);
+        let class_index = jvm.class_store.class_index_for_type(AbstractTypeDescription::parse_full(class_descriptor).unwrap()).unwrap();
+        let field_name_string_reference = frame.load_local_reference(2).unwrap();
+
+        let rust_field_name_string = jvm.heap_area.decode_java_string(field_name_string_reference, &jvm.class_store);
+
+        let byte_offset: i64 = ClassFieldIterator::new(class_index as usize, &jvm.class_store)
+            .take_while(|f| f.name != rust_field_name_string)
+            .map(|f| f.descriptor.storage_size() as i64)
+            .sum();
+
+        Ok(JVMCallbackOperation::ReturnFrame(FieldValue::Long(byte_offset)))
+    }
+
     pub fn array_index_scale_0(jvm: &mut JVM) -> Result<JVMCallbackOperation, Error> {
         let frame     = {
             let frame_index = jvm.stack_frames.len() - 1;
@@ -1127,6 +1158,71 @@ pub fn function_for(class_name: &str, m: &crate::classfile::MethodInfo) -> Resul
             Ok(todo_call)
         }
 
+        ("java/lang/Runtime", "availableProcessors") => {
+            let expected_descriptor = MethodDescriptor {
+                argument_types: Box::new([]),
+                return_type: AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Int()},
+            };
+
+            if m.descriptor != expected_descriptor {
+                return Err(Error::RunTimeError(format!("Native descriptor mismatch for method '{class_name}.{method_name}': found '{}' but expected '{}'", m.descriptor.source_string(), expected_descriptor.source_string())));
+            }
+
+            Ok(JavaLangRuntime::available_processors)
+        }
+
+        ("java/lang/Runtime", "freeMemory") => {
+            let expected_descriptor = MethodDescriptor {
+                argument_types: Box::new([]),
+                return_type: AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Long()},
+            };
+
+            if m.descriptor != expected_descriptor {
+                return Err(Error::RunTimeError(format!("Native descriptor mismatch for method '{class_name}.{method_name}': found '{}' but expected '{}'", m.descriptor.source_string(), expected_descriptor.source_string())));
+            }
+
+            Ok(todo_call)
+        }
+
+        ("java/lang/Runtime", "gc") => {
+            let expected_descriptor = MethodDescriptor {
+                argument_types: Box::new([]),
+                return_type: AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Void()},
+            };
+
+            if m.descriptor != expected_descriptor {
+                return Err(Error::RunTimeError(format!("Native descriptor mismatch for method '{class_name}.{method_name}': found '{}' but expected '{}'", m.descriptor.source_string(), expected_descriptor.source_string())));
+            }
+
+            Ok(todo_call)
+        }
+
+        ("java/lang/Runtime", "maxMemory") => {
+            let expected_descriptor = MethodDescriptor {
+                argument_types: Box::new([]),
+                return_type: AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Long()},
+            };
+
+            if m.descriptor != expected_descriptor {
+                return Err(Error::RunTimeError(format!("Native descriptor mismatch for method '{class_name}.{method_name}': found '{}' but expected '{}'", m.descriptor.source_string(), expected_descriptor.source_string())));
+            }
+
+            Ok(todo_call)
+        }
+
+        ("java/lang/Runtime", "totalMemory") => {
+            let expected_descriptor = MethodDescriptor {
+                argument_types: Box::new([]),
+                return_type: AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Long()},
+            };
+
+            if m.descriptor != expected_descriptor {
+                return Err(Error::RunTimeError(format!("Native descriptor mismatch for method '{class_name}.{method_name}': found '{}' but expected '{}'", m.descriptor.source_string(), expected_descriptor.source_string())));
+            }
+
+            Ok(todo_call)
+        }
+
         ("java/lang/System", "arraycopy") => {
             let expected_descriptor = MethodDescriptor {
                 argument_types: Box::new([
@@ -1263,6 +1359,19 @@ pub fn function_for(class_name: &str, m: &crate::classfile::MethodInfo) -> Resul
             Ok(todo_call)
         }
 
+        ("java/lang/Thread", "registerNatives") => {
+            let expected_descriptor = MethodDescriptor {
+                argument_types: Box::new([]),
+                return_type: AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Void()},
+            };
+
+            if m.descriptor != expected_descriptor {
+                return Err(Error::RunTimeError(format!("Native descriptor mismatch for method '{class_name}.{method_name}': found '{}' but expected '{}'", m.descriptor.source_string(), expected_descriptor.source_string())));
+            }
+
+            Ok(ignore_call)
+        }
+
         ("jdk/internal/misc/Unsafe", "arrayBaseOffset0") => {
             let expected_descriptor = MethodDescriptor {
                 argument_types: Box::new([
@@ -2149,7 +2258,7 @@ pub fn function_for(class_name: &str, m: &crate::classfile::MethodInfo) -> Resul
                 return Err(Error::RunTimeError(format!("Native descriptor mismatch for method '{class_name}.{method_name}': found '{}' but expected '{}'", m.descriptor.source_string(), expected_descriptor.source_string())));
             }
 
-            Ok(todo_call)
+            Ok(JdkInternalMiscUnsafe::object_field_offset_1)
         }
 
         ("jdk/internal/misc/Unsafe", "registerNatives") => {