Implemented java/lang/Throwable.fill_in_stacktrace

src/classfile.rs

@@ -375,6 +375,22 @@ impl JavaClassFile {
 
         return Ok((class_name, method_name, method_descriptor));
     }
+    
+    pub fn sourcefile(&self) -> Result<Option<&String>, Error> {
+        match self.attributes.into_iter()
+            .filter_map(|attribute| match &attribute.data {
+                AttributeData::SourceFile(data) => Some(data),
+                _ => None,
+            })
+            .next() {
+                None => Ok(None),
+                Some(data) => {
+                    let sourcefile_name = &self.pool_utf8_entry(data.source_file_index)?.utf8;
+
+                    Ok(Some(sourcefile_name))
+                },
+        }
+    }
 }
 
 #[derive(Debug)] 
@@ -953,6 +969,13 @@ impl AbstractTypeDescription {
         }
     }
 
+    pub fn class_type(class: &str) -> AbstractTypeDescription {
+        AbstractTypeDescription {
+            array_level: 0,
+            kind: AbstractTypeKind::Classname(class.to_string())
+        }
+    }
+
 }
 
 #[derive(Debug, Eq, PartialEq)] 
@@ -1078,6 +1101,23 @@ impl MethodInfo {
         )
     }
 
+    pub fn get_bytecode_linenumber(&self, bytecode_index: u16) -> Option<u16> {
+        let linenumbertable = match self.attributes
+            .into_iter()
+            .filter_map(|a| match &a.data {
+                AttributeData::LineNumberTable(data) => Some(data),
+                _ => None,
+            })
+            .next() {
+                Some(a) => a,
+                None => return None,
+        };
+        linenumbertable.entries.into_iter()
+            .take_while(|entry| entry.start_pc < bytecode_index)
+            .map(|entry| entry.line_number)
+            .last()
+    }
+
     pub fn get_code_attribute(&self) -> Option<&CodeAttributeData> {
         return if self.code_attribute_index != self.attributes.len() {
             match &self.attributes[self.code_attribute_index].data {

src/native_methods.rs

@@ -372,7 +372,93 @@ impl JavaLangSystem {
 struct JavaLangThrowable {}
 
 impl JavaLangThrowable {
+    pub fn fill_in_stacktrace(jvm: &mut JVM) -> Result<JVMCallbackOperation, Error> {
+        if ! jvm.class_store.have_class(&String::from("java/lang/StackTraceElement")) {
+            return Ok(JVMCallbackOperation::LoadClass(String::from("java/lang/StackTraceElement")));
+        }
+        if ! jvm.class_store.was_init(&String::from("java/lang/StackTraceElement")).unwrap() {
+            return Ok(JVMCallbackOperation::LoadClass(String::from("java/lang/StackTraceElement")));
+        }
 
+        let stackelement_class_index = jvm.class_store.class_idx_from_name(&String::from("java/lang/StackTraceElement")).unwrap();
+        let stackelement_class_ref = jvm.class_store.get_class_objectref_from_index(stackelement_class_index);
+        let stackelement_type = AbstractTypeDescription::class_type("java/lang/StackTraceElement");
+        let _ = match jvm.class_store.get_array_class_ref(&stackelement_type.array()) {
+            Some(r) => r,
+            None => return Ok(JVMCallbackOperation::MakeArrayClass(stackelement_class_ref, stackelement_type)),
+        };
+
+        let this = {
+            let frame = {
+                let frame_index = jvm.stack_frames.len() - 1;
+                &jvm.stack_frames[frame_index]
+            };
+            frame.load_local_reference(0).unwrap()
+        };
+
+        let stackelement_array = jvm.heap_area.make_empty_array(&jvm.class_store, AbstractTypeDescription::class_type("java/lang/StackTraceElement"), jvm.stack_frames.len());
+
+        jvm.heap_area.object_area.set_object_field(
+            this,
+            "stackTrace",
+            stackelement_array.into(),
+            stackelement_class_index,
+            &jvm.class_store
+        )?;
+
+        for (index, frame) in (&jvm.stack_frames).into_iter().enumerate() {
+            let class_file   = jvm.class_store.class_file_from_idx(frame.class_index).unwrap();
+            let method_info  = &class_file.methods[frame.method_index as usize];
+
+            let class_name   = class_file.get_classname()?;
+
+            let line_number = method_info.get_bytecode_linenumber(frame.instruction_pointer.try_into().unwrap());
+
+            let stackelement = jvm.heap_area.make_object(&jvm.class_store, stackelement_class_index);
+
+            let class_name_string = jvm.heap_area.make_handmade_string(class_name, &jvm.class_store);
+            let method_name_string = jvm.heap_area.make_handmade_string(&method_info.name, &jvm.class_store);
+
+            let sourcefile = class_file.sourcefile()?;
+            let sourcefile_string = match sourcefile {
+                Some(string) => jvm.heap_area.make_handmade_string(string, &jvm.class_store),
+                None => jvm.heap_area.static_area.get(&String::from("StackTraceElement"), &String::from("UNKNOWN_SOURCE"), AbstractTypeDescription::class_type("java/lang/String")).unwrap().expect_reference(),
+            };
+
+            jvm.heap_area.object_area.set_object_field(
+                stackelement,
+                "declaringClass",
+                FieldValue::Reference(class_name_string),
+                stackelement_class_index,
+                &jvm.class_store
+            )?;
+            jvm.heap_area.object_area.set_object_field(
+                stackelement,
+                "methodName",
+                FieldValue::Reference(method_name_string),
+                stackelement_class_index,
+                &jvm.class_store
+            )?;
+            jvm.heap_area.object_area.set_object_field(
+                stackelement,
+                "lineNumber",
+                FieldValue::Int(line_number.unwrap_or(1) as i32),
+                stackelement_class_index,
+                &jvm.class_store
+            )?;
+            jvm.heap_area.object_area.set_object_field(
+                stackelement,
+                "fileName",
+                FieldValue::Reference(sourcefile_string),
+                stackelement_class_index,
+                &jvm.class_store
+            )?;
+
+            jvm.heap_area.object_area.set_array_element(stackelement_array, index, stackelement.into());
+        }
+
+        Ok(JVMCallbackOperation::ReturnFrame(this.into()))
+    }
 }
 
 struct JdkInternalMiscUnsafe {}
@@ -2861,7 +2947,7 @@ pub fn function_for(class_name: &str, m: &crate::classfile::MethodInfo) -> Resul
                 ]),
                 return_type: AbstractTypeDescription { array_level: 0, kind: AbstractTypeKind::Classname("java/lang/Throwable".to_string())},
             },
-            JavaLangThrowable::fill_in_stacktrace()
+            JavaLangThrowable::fill_in_stacktrace
         ),
     ];