implement java main

src/class.rs

@@ -2,6 +2,7 @@ use std::collections::HashMap;
 use std::fmt;
 use std::rc::Rc;
 use std::sync::Arc;
+use anyhow::{anyhow, Error};
 use crate::classloader::CpEntry;
 use crate::heap::Object;
 
@@ -27,13 +28,8 @@ impl Class {
         (self.major_version, self.minor_version)
     }
 
-    // pub fn execute(&self, method_name: &str) -> Value {
-    //     let m = self.methods.get(method_name).unwrap();
-    //     execute(m).unwrap() //TODO
-    // }
-
-    pub fn get_method(&self, name: &str) -> &Method {
-        self.methods.get(name).expect("ClassNountFoundException")
+    pub fn get_method(&self, name: &str) -> Result<&Method, Error> {
+        self.methods.get(name).ok_or(anyhow!("Method {} not found", name))
     }
 }
 unsafe impl Send for Class {}

src/main.rs

@@ -1,15 +1,10 @@
-use regex::Regex;
+use std::io::Error;
+use classfile_reader::vm::Vm;
 
-fn main() {
-    // if let Some(class) = classfile_reader::get_class(classfile_reader::io::read_class_file("./Dummy.class")){
-    //     println!("{:?}", class);
-    //     let ret = class.execute("public static get()D");
-    //     println!("{:?}", ret);
-    // }
-
-    let pattern = Regex::new(".*/(.+)").unwrap();
-    let c = pattern.captures("java/lang/String").unwrap().get(1);
-    println!("{}", c.unwrap().as_str());
+fn main() -> Result<(), Error> {
+    let mut vm = Vm::new("tests");
+    vm.execute("Main","public static main([Ljava/lang/String;)V", None).unwrap();
+    Ok(())
 }
 
 

src/vm.rs

@@ -34,6 +34,7 @@ pub struct Vm {
     classes: HashMap<String, Arc<Class>>,
     //TODO implement classloader
     heap: Heap,
+    pub exitcode: i32,
 }
 
 impl Vm {
@@ -42,13 +43,14 @@ impl Vm {
             classpath: classpath.split(':').map(|s| s.to_owned()).collect(),
             classes: HashMap::new(),
             heap: Heap::new(),
+            exitcode: 0,
         }
     }
 
     pub fn get_class(&mut self, class_name: &str) -> Result<Arc<Class>, Error> {
         let entry = self.classes.entry(class_name.into());
         let entry = entry.or_insert_with(|| {
-            let resolved_path = find_class(&self.classpath, class_name).unwrap();
+            let resolved_path = find_class(&self.classpath, class_name).expect("Class not found");
             let bytecode = read_class_file(resolved_path).unwrap();
             Arc::new(load_class(bytecode).unwrap())
         });
@@ -77,7 +79,7 @@ impl Vm {
 
     pub fn execute(&mut self, class_name: &str, method_name: &str, instance: Option<Arc<Object>>) -> Result<Arc<Value>, Error> {
         let class = self.get_class(class_name)?;
-        let method = class.get_method(method_name);
+        let method = class.get_method(method_name)?;
         if let AttributeType::Code(code) = method.attributes.get("Code").unwrap() {
             let mut stack = StackFrame::new();
             let mut pc: usize = 0;

tests/Float.java

@@ -1,14 +0,0 @@
-public class Float {
-
-   private final static float f =42.0F;
-
-   private float f2;
-
-   public static float getF() {
-       return f;
-   }
-
-   public float getF2(){
-       return f2;
-   }
-}

tests/FloatBean.java

@@ -0,0 +1,10 @@
+public class FloatBean {
+
+   private final static float f =42.0F;
+
+   private float value;
+
+   public float getValue(){
+       return value;
+   }
+}

tests/Main.java

@@ -0,0 +1,6 @@
+public class Main {
+
+   public static void main(String[] args){
+        new FloatBean().getValue();
+   }
+}