Add is_account_empty as experimental method

Author: s1na

README.md

@@ -24,7 +24,7 @@ Other modules are available as well, outside of the prelude. Refer to the docume
 - `default`: Builds with `wee_alloc` as the global allocator and with the Rust standard library.
 - `qimalloc`: Builds with [qimalloc](https://github.com/wasmx/qimalloc) as the global allocator.
 - `debug`: Exposes the debugging interface.
-- `experimental`: Exposes the experimental bignum system library API.
+- `experimental`: Exposes the experimental APIs (bignum system library, evm2wasm EEI)
 
 Further documentation is available [here](https://docs.rs/ewasm_api/).
 

src/experimental.rs

@@ -0,0 +1,18 @@
+//! Experimental methods.
+
+use super::*;
+
+mod native {
+    extern "C" {
+        pub fn experimental_isAccountEmpty(addressOffset: *const u32) -> u32;
+    }
+}
+
+pub fn is_account_empty(address: &Address) -> bool {
+    let ret = unsafe { native::experimental_isAccountEmpty(address.bytes.as_ptr() as *const u32) };
+    if ret != 0 && ret != 1 {
+        panic!();
+    }
+
+    ret == 1
+}

src/lib.rs

@@ -11,7 +11,7 @@
 //! - `qimalloc`: Builds with [qimalloc](https://github.com/wasmx/qimalloc) as the global
 //! allocator.
 //! - `debug`: Exposes the debugging interface.
-//! - `experimental`: Exposes the experimental bignum system library API.
+//! - `experimental`: Exposes the experimental APIs (bignum system library, evm2wasm EEI)
 //!
 //! # Examples
 //! ```ignore
@@ -52,6 +52,7 @@ pub mod debug;
 
 #[cfg(feature = "experimental")]
 pub mod bignum;
+pub mod experimental;
 
 #[cfg(not(feature = "std"))]
 pub mod convert;
@@ -76,6 +77,7 @@ pub mod prelude {
 
     #[cfg(feature = "experimental")]
     pub use crate::bignum;
+    pub use crate::experimental;
 }
 
 /// Enum representing an error code for EEI calls. Currently used by `codeCopy`, `callDataCopy`,