Bugfix int <-> long converting

tests/integration_test.rs

@@ -342,7 +342,10 @@ fn get_long(locals_opt: Option<Vec<i32>>) -> i64 {
     let low = two[0];
     let high = two[1];
 
-    ((high as i64) << 32) | (low as i64)
+    let high_i64 = (high as i64) << 32;
+    let low_i64 = low as u32 as i64;
+
+    high_i64 | low_i64
 }
 
 fn get_float(locals: Option<Vec<i32>>) -> f32 {

vm/src/execution_engine/engine.rs

@@ -728,13 +728,12 @@ impl Engine {
                     println!("IINC -> {current_val} + {const_val} = {new_val}");
                 }
                 I2L => {
-                    let low = stack_frame.pop();
+                    let value = stack_frame.pop() as i64;
 
-                    stack_frame.push(low);
-                    stack_frame.push(0);
+                    stack_frame.push_i64(value);
 
                     stack_frame.incr_pc();
-                    println!("I2L -> {low}L");
+                    println!("I2L -> {value}L");
                 }
                 I2F => {
                     let value = stack_frame.pop() as f32;

vm/src/system_native/system.rs

@@ -1,8 +1,8 @@
 pub(crate) fn current_time_millis_wrp(_args: &[i32]) -> Vec<i32> {
     let millis = current_time_millis();
 
-    let low = millis as i32;
-    let high = (millis >> 32) as i32;
+    let high = ((millis >> 32) & 0xFFFFFFFF) as i32;
+    let low = (millis & 0xFFFFFFFF) as i32;
 
     vec![high, low]
 }