Static object creation

src/accessmasks.rs

@@ -130,10 +130,34 @@ pub enum FieldAccessFlag {
     Enum      = 0x4000, // 	Declared as an element of an enum class. 
  }
 
+#[derive(Clone, Copy)]
 pub struct FieldAccessFlagMask {
     pub mask: u16
 }
 
+impl FieldAccessFlag {
+    pub fn discriminant(&self) -> u16 {
+        return match self {
+            Self::Public    => 0x0001,
+            Self::Private   => 0x0002,
+            Self::Protected => 0x0004,
+            Self::Static    => 0x0008,
+            Self::Final     => 0x0010,
+            Self::Volatile  => 0x0040,
+            Self::Transient => 0x0080,
+            Self::Synthetic => 0x1000,
+            Self::Enum      => 0x4000,
+        }
+    }
+}
+
+impl BitAnd<FieldAccessFlag> for FieldAccessFlagMask {
+    type Output=bool;
+    fn bitand(self, f: FieldAccessFlag) -> bool {
+        return (self.mask & f.discriminant()) != 0;
+    }
+}
+
 impl Debug for FieldAccessFlagMask {
     fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), std::fmt::Error> {
         let mut flag_vec = Vec::new();

src/classfile.rs

@@ -266,10 +266,10 @@ impl JavaClassFile {
 
 #[derive(Debug)] 
 pub struct FieldInfo {
-    access_flags: FieldAccessFlagMask,
+    pub access_flags: FieldAccessFlagMask,
-    name: String,
+    pub name: String,
-    descriptor: AbstractTypeDescription,
+    pub descriptor: AbstractTypeDescription,
-    attributes: Box<[AttributeInfo]>,
+    pub attributes: Box<[AttributeInfo]>,
 }
 
 impl FieldInfo {
@@ -535,11 +535,15 @@ impl NestMembersAttributeData {
 pub enum AttributeData {
     Code(CodeAttributeData),
     Signature(SignatureAttributeData),
+    Synthetic(),
+    Exceptions(ExceptionAttributeData),
     NestMembers(NestMembersAttributeData),
     SourceFile(SourceFileAttributeData),
     InnerClasses(InnerClassesAttributeData),
     ConstantValue(ConstantValueAttributeData),
+    DebugExtension(DebugExtensionAttributeData),
     LineNumberTable(LineNumberTableAttributeData),
+    EnclosingMethod(EnclosingMethodAttributeData),
     Unknown(UnknownAttributeData),
 }
 
@@ -564,7 +568,7 @@ impl AttributeInfo {
 
     fn from_reader(reader: &mut dyn Read, pool: &Box<[ConstantPoolInfo]>, allow_code_attr: bool) -> Result<Self, Error> {
         let attribute_name_index: u16   = read_u16(reader)? - 1;
-        let _attribute_byte_size: usize = read_u32(reader)?.try_into()?;
+        let attribute_byte_size: usize = read_u32(reader)?.try_into()?;
 
         let data = {
             let name_entry = &pool[attribute_name_index as usize];
@@ -600,9 +604,21 @@ impl AttributeInfo {
 
                 "NestMembers" => AttributeData::NestMembers(NestMembersAttributeData::from_reader(reader)?),
 
+                "Exceptions" => AttributeData::Exceptions(ExceptionAttributeData::from_reader(reader)?),
+
+                "EnclosingMethod" => AttributeData::EnclosingMethod(EnclosingMethodAttributeData {class_index: read_u16(reader)?, method_index: read_u16(reader)?}),
+
+                "Synthetic" => AttributeData::Synthetic(),
+
+                "DebugExtension" => AttributeData::DebugExtension(
+                    DebugExtensionAttributeData { 
+                        utf8: std::str::from_utf8(&(read_buffer(reader, attribute_byte_size)?))?.to_string(),
+                    }
+                ),
+
                 &_ => AttributeData::Unknown(
                     UnknownAttributeData {
-                        info: read_buffer(reader, _attribute_byte_size)?,
+                        info: read_buffer(reader, attribute_byte_size)?,
                     }
                 )
             }
@@ -617,8 +633,42 @@ impl AttributeInfo {
     }
 }
 
+#[derive(Debug)]
+pub struct DebugExtensionAttributeData {
+    utf8: String,
+}
+
+#[derive(Debug)]
+pub struct EnclosingMethodAttributeData {
+    class_index: u16,
+    method_index: u16,
+}
+
+// for use on methods, what exception can be thrown by this
+#[derive(Debug)]
+pub struct ExceptionAttributeData {
+    exception_indices: Box<[u16]>,
+}
+
+impl ExceptionAttributeData {
+    fn from_reader(reader: &mut dyn Read) -> Result<Self, Error> {
+        let length = read_u16(reader)?;
+        let mut exception_vector = Vec::with_capacity(length as usize);
+
+        for _ in 0..length {
+            exception_vector.push(read_u16(reader)?);
+        }
+
+        Ok(
+            ExceptionAttributeData {
+                exception_indices: exception_vector.into_boxed_slice()
+            }
+        )
+    }
+}
+
 #[repr(u8)]
-#[derive(Debug, Eq, PartialEq)]
+#[derive(Debug, Eq, PartialEq, Clone)]
 pub enum AbstractTypeKind {
     Void()              = b'V', // void
     Byte()              = b'B', //  signed byte
@@ -649,7 +699,7 @@ impl Into<String> for &AbstractTypeKind {
     }
 }
 
-#[derive(Debug, Eq, PartialEq)]
+#[derive(Debug, Eq, PartialEq, Clone)]
 pub struct AbstractTypeDescription {
     pub array_level: u8,
     pub kind: AbstractTypeKind,

src/heap_area.rs

@@ -1,7 +1,8 @@
 use std::collections::HashMap;
 
+use crate::accessmasks::FieldAccessFlag;
 use crate::stackframe::Value;
-use crate::classfile::{ AbstractTypeDescription, MethodInfo };
+use crate::classfile::{ JavaClassFile, AbstractTypeDescription, MethodInfo };
 
 #[derive(Debug)]
 pub struct HeapArea {
@@ -54,13 +55,46 @@ pub struct StaticArea {
     static_objects: HashMap<String, StaticObject>,
 }
 
+impl StaticArea {
+    pub fn make(&mut self, class: &JavaClassFile, class_index: usize) {
+        let mut fields = Vec::new();
+
+        for field in &class.fields {
+            if field.access_flags & FieldAccessFlag::Static {
+                fields.push(
+                    StaticField {
+                        name: field.name.clone(),
+                        type_description: field.descriptor.clone(),
+                        value: Value::default_for(field.descriptor),
+                    }
+                )
+            }
+        }
+
+        let new_object = StaticObject {
+            class_index,
+            fields: fields.into_boxed_slice(),
+            methods: Box::new([]),
+        };
+
+        let _ = self.static_objects.insert(class.get_classname().unwrap(), new_object);
+    }
+}
+
 #[derive(Debug)]
 pub struct StaticObject {
     pub class_index: usize,
-    pub fields: Box<[ObjectField]>,
+    pub fields: Box<[StaticField]>,
     pub methods: Box<[MethodInfo]>,
 }
 
+#[derive(Debug)]
+pub struct StaticField {
+    pub name: String,
+    pub type_description: AbstractTypeDescription,
+    pub value: Value,
+}
+
 #[derive(Debug)]
 pub struct ObjectField {
     pub type_description: AbstractTypeDescription,

src/jvm.rs

@@ -161,7 +161,7 @@ impl JVM {
                 },
 
                 JVMCallbackOperation::InitClass(name) => {
-                    self.init_class(*self.class_store.class_idx_from_name(&name).unwrap());
+                    self.init_class(*self.class_store.class_idx_from_name(&name).unwrap())?;
                 }
             }
         }
@@ -169,14 +169,19 @@ impl JVM {
         Ok(())
     }
 
-    pub fn init_class(&mut self, class_idx: usize) {
+    pub fn init_class(&mut self, class_idx: usize) -> Result<(), Error> {
         let class_file = self.class_store.class_file_from_idx(class_idx).unwrap();
         let clinit_idx = class_file.find_method_index(&"<clinit>".to_string());
 
-        // TODO: ConstantValue Attributes (final)
         // TODO: Static Stuff
+        self.heap_area.static_area.make(class_file, class_idx);
+
+        // TODO: ConstantValue Attributes (final)
+        // TODO: Push clinit function
 
         self.class_store.set_init(class_idx, true);
+
+        Ok(())
     }
 
     fn prepare_invoke_static(&mut self, class_index: usize, method_name: &String, arguments: &[Value]) -> Result<(), Error> {

src/main.rs

@@ -26,5 +26,6 @@ fn main() {
         Err(e) => println!("{:#?}", e),
     };
 
-    println!("{:#?}", jvm.stack_frames);
+    println!("{:#?}", jvm);
+    //println!("{:#?}", JavaClassFile::new(&mut File::open("java/Class.class").unwrap()));
 }

src/stackframe.rs

@@ -1,4 +1,4 @@
-use crate::classfile::{ JavaClassFile, AttributeData };
+use crate::classfile::{ JavaClassFile, AttributeData, AbstractTypeDescription };
 use crate::heap_area::ObjectReference;
 
 #[derive(Copy, Clone, Debug)]
@@ -18,6 +18,23 @@ pub enum Value {
     Empty(),
 }
 
+impl Value {
+    fn default_for(t: AbstractTypeDescription) -> Self {
+        match t {
+            AbstractTypeDescription::Void()            => unreachable!(),
+            AbstractTypeDescription::Byte()            => Value::Byte(0),
+            AbstractTypeDescription::Char()            => Value::Char(0),
+            AbstractTypeDescription::Double()          => Value::Double(0),
+            AbstractTypeDescription::Float()           => ,
+            AbstractTypeDescription::Int()             => ,
+            AbstractTypeDescription::Long()            => ,
+            AbstractTypeDescription::Classname(String) => ,
+            AbstractTypeDescription::Short()           => ,
+            AbstractTypeDescription::Boolean()         => ,
+        }
+    }
+}
+
 #[derive(Debug)]
 pub struct OperandStack {
     stack: Box<[Value]>,