Debug API

Cargo.toml

@@ -10,3 +10,4 @@ edition = "2018"
 [features]
 default = [ "std" ]
 std = []
+debug = []

src/debug.rs

@@ -0,0 +1,10 @@
+/// The native debug interface exposed to the ewasm contract. These functions are for testing
+/// purposes only. On a live VM, any bytecode trying to import these symbols will be rejected.
+extern "C" {
+    pub fn debug_print32(value: u32);
+    pub fn debug_print64(value: u64);
+    pub fn debug_printMem(offset: *const u32, len: u32);
+    pub fn debug_printMemHex(offset: *const u32, len: u32);
+    pub fn debug_printStorage(pathOffset: *const u32);
+    pub fn debug_printStorageHex(pathOffset: *const u32);
+}

src/lib.rs

@@ -21,6 +21,9 @@
 mod native;
 pub mod types;
 
+#[cfg(feature = "debug")]
+pub mod debug;
+
 #[cfg(not(feature = "std"))]
 pub mod convert;