added opcodes

src/main.rs

@@ -1,4 +1,5 @@
 use java_rs::vm::runtime::Vm;
+use std::cmp::Ordering::Equal;
 
 fn main() {
     let a = 0.0;

src/value.rs

@@ -1,4 +1,5 @@
 use crate::vm::object::ObjectRef;
+use std::ops::{Add, AddAssign};
 
 #[derive(Debug, Clone)]
 pub enum Value {
@@ -12,7 +13,7 @@ pub enum Value {
     F32(f32),
     F64(f64),
     BOOL(bool),
-    CHAR(char),
+    CHAR(i32),
     // objects and arrays
     Ref(ObjectRef),
     // special object
@@ -38,8 +39,7 @@ impl Value {
             | Value::CHAR(_)
             | Value::Ref(_)
             | Value::Utf8(_) => ComputationalType::C1,
-            Value::I64(_)
-            | Value::F64(_) => ComputationalType::C2
+            Value::I64(_) | Value::F64(_) => ComputationalType::C2,
         }
     }
 
@@ -83,4 +83,12 @@ impl Value {
             panic!();
         }
     }
+
+    pub fn into_utf8(self) -> String {
+        if let Value::Utf8(v) = self {
+            v
+        } else {
+            panic!();
+        }
+    }
 }

src/vm/array.rs

@@ -95,11 +95,11 @@ pub(crate) fn array_store(value: Value, index: Value, arrayref: Value) -> Result
                 }
                 CharArray(ref mut array) => {
                     if let I32(value) = value {
-                        array[index as usize] = char::from_u32(value as u32).unwrap();
+                        array[index as usize] = value
                     } else {
                         unreachable!()
                     }
-                },
+                }
                 LongArray(ref mut array) => {
                     if let I64(value) = value {
                         array[index as usize] = value;

src/vm/object.rs

@@ -16,7 +16,7 @@ pub enum ObjectRef {
     FloatArray(Vec<f32>),
     DoubleArray(Vec<f64>),
     BooleanArray(Vec<bool>),
-    CharArray(Vec<char>),
+    CharArray(Vec<i32>),
     StringArray(Vec<String>),
     ObjectArray(ClassId, Vec<ObjectRef>),
     Object(Rc<RefCell<Object>>),
@@ -86,7 +86,7 @@ impl ObjectRef {
             6 => FloatArray(vec![0.0; size]),
             7 => DoubleArray(vec![0.0; size]),
             4 => BooleanArray(vec![false; size]),
-            5 => CharArray(vec![0 as char; size]),
+            5 => CharArray(vec![0; size]),
             _ => unreachable!("impossible array type"),
         }
     }

src/vm/runtime.rs

@@ -421,19 +421,87 @@ impl Stackframe {
                         value1.into_i32() >> (value2.into_i32() & MASK_LOWER_5BITS)
                     ));
                 }
+                LCMP => {
+                    let value2 = self.pop().into_i64();
+                    let value1 = self.pop().into_i64();
+                    self.push(I32(compare(value1, value2)));
+                }
+                IINC(index8, const8) => {
+                    self.increment(*index8 as usize, *const8 as u16);
+                }
+                I2L => {
+                    let value = self.pop().into_i32() as i64;
+                    self.push(I64(value));
+                }
+                I2F => {
+                    let value = self.pop().into_i32() as f32;
+                    self.push(F32(value));
+                }
+                I2D => {
+                    let value = self.pop().into_i32() as f64;
+                    self.push(F64(value));
+                }
+                L2I => {
+                    let value = self.pop().into_i64() as i32;
+                    self.push(I32(value));
+                }
+                L2F => {
+                    let value = self.pop().into_i64() as f32;
+                    self.push(F32(value));
+                }
+                L2D => {
+                    let value = self.pop().into_i64() as f64;
+                    self.push(F64(value));
+                }
+                WIDE_IINC(index16, const16) => {
+                    self.increment(*index16 as usize, *const16);
+                }
+                F2I => {
+                    let value = self.pop().into_f32() as i32;
+                    self.push(I32(value));
+                }
+                F2L => {
+                    let value = self.pop().into_f32() as i64;
+                    self.push(I64(value));
+                }
+                F2D => {
+                    let value = self.pop().into_f32() as f64;
+                    self.push(F64(value));
+                }
+                D2I => {
+                    let value = self.pop().into_f64() as i32;
+                    self.push(I32(value));
+                }
+                D2L => {
+                    let value = self.pop().into_f64() as i64;
+                    self.push(I64(value));
+                }
+                D2F => {
+                    let value = self.pop().into_f64() as f32;
+                    self.push(F32(value));
+                }
+                I2B => {
+                    let value = self.pop().into_i32() as u8;
+                    self.push(I32(value as i32));
+                }
+                I2C => {
+                    let value = self.pop().into_i32();
+                    self.push(CHAR(value));
+                }
+                I2S => {
+                    let value = self.pop().into_i32() as i16; //semantics for narrowing seems same as java
+                    self.push(I32(value as i32));
+                }
                 FCMPG | FCMPL => {
                     let value2 = self.pop().into_f32();
                     let value1 = self.pop().into_f32();
-                    if value1 == value2 {
-                        self.push(I32(0))
-                    } else if value1 < value2 {
-                        self.push(I32(-1))
-                    } else if value1 > value2 {
-                        self.push(I32(1))
+                    self.push(I32(compare(value1, value2)));
                 }
-                    //TODO something with NaN
+                DCMPG | DCMPL => {
+                    let value2 = self.pop().into_f64();
+                    let value1 = self.pop().into_f64();
+                    self.push(I32(compare(value1, value2)));
                 }
-
                 IFEQ(jmp_to) | IFNE(jmp_to) | IFLT(jmp_to) | IFGE(jmp_to) | IFGT(jmp_to)
                 | IFLE(jmp_to) => {
                     let value = self.pop();
@@ -774,21 +842,11 @@ impl Stackframe {
                     let value = self.pop().into_f64();
                     self.push(F64(-value));
                 }
-                ISHL => {
-                    let value2 = self.pop().into_i32();
-                    let value1 = self.pop().into_i32();
-                    self.push(I32(value1 << value2));
-                }
                 LSHL => {
                     let value2 = self.pop().into_i64();
                     let value1 = self.pop().into_i64();
                     self.push(I64(value1 << value2));
                 }
-                ISHR => {
-                    let value2 = self.pop().into_i32();
-                    let value1 = self.pop().into_i32();
-                    self.push(I32(value1 >> value2));
-                }
                 LSHR => {
                     let value2 = self.pop().into_i64();
                     let value1 = self.pop().into_i64();
@@ -820,6 +878,16 @@ impl Stackframe {
         Void
     }
 
+    fn increment(&mut self, index: usize, inc: u16) {
+        match &mut self.locals[index] {
+            I32(l) => *l += (inc as i32),
+            I64(l) => *l += (inc as i64),
+            F32(l) => *l += (inc as f32),
+            F64(l) => *l += (inc as f64),
+            _ => {}
+        }
+    }
+
     fn store(&mut self, index: u8) -> Result<(), Error> {
         let index = index as usize;
         let value = self.pop();
@@ -933,3 +1001,10 @@ impl MethodSignature {
         MethodSignature { name, num_args }
     }
 }
+
+fn compare<T>(a: T, b: T) -> i32
+where
+    T: PartialOrd,
+{
+    a.partial_cmp(&b).unwrap() as i32
+}