Add is_account_empty

Author: s1na

src/lib.rs

@@ -604,3 +604,12 @@ pub fn selfdestruct(address: &Address) -> ! {
         native::ethereum_selfDestruct(address.bytes.as_ptr() as *const u32);
     }
 }
+
+pub fn is_account_empty(address: &Address) -> bool {
+    let ret = unsafe { native::ethereum_isAccountEmpty(address.bytes.as_ptr() as *const u32) };
+    if ret != 0 && ret != 1 {
+        panic!();
+    }
+
+    ret == 1
+}

src/native.rs

@@ -74,4 +74,5 @@ extern "C" {
     pub fn ethereum_storageLoad(keyOffset: *const u32, resultOffset: *const u32);
     pub fn ethereum_storageStore(keyOffset: *const u32, valueOffset: *const u32);
     pub fn ethereum_selfDestruct(addressOffset: *const u32) -> !;
+    pub fn ethereum_isAccountEmpty(addressOffset: *const u32) -> u32;
 }