TVMPODValue macro

Author: nhynes

rust/common/Cargo.toml

@@ -3,6 +3,7 @@ name = "tvm-common"
 version = "0.1.0"
 authors = ["TVM Contributors"]
 license = "Apache-2.0"
+edition = "2018"
 
 [features]
 bindings = []

rust/common/src/errors.rs

@@ -1,47 +1,11 @@
-use std::fmt;
-
-static TYPE_CODE_STRS: [&str; 15] = [
-    "int",
-    "uint",
-    "float",
-    "handle",
-    "null",
-    "TVMType",
-    "TVMContext",
-    "ArrayHandle",
-    "NodeHandle",
-    "ModuleHandle",
-    "FuncHandle",
-    "str",
-    "bytes",
-    "NDArrayContainer",
-    "ExtBegin",
-];
-
 #[derive(Debug, Fail)]
+#[fail(
+    display = "Could not downcast `{}` into `{}`",
+    expected_type, actual_type
+)]
 pub struct ValueDowncastError {
-    actual_type_code: i64,
-    expected_type_code: i64,
-}
-
-impl ValueDowncastError {
-    pub fn new(actual_type_code: i64, expected_type_code: i64) -> Self {
-        Self {
-            actual_type_code,
-            expected_type_code,
-        }
-    }
-}
-
-impl fmt::Display for ValueDowncastError {
-    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(
-            formatter,
-            "Could not downcast TVMValue: expected `{}` but was {}",
-            TYPE_CODE_STRS[self.actual_type_code as usize],
-            TYPE_CODE_STRS[self.expected_type_code as usize]
-        )
-    }
+    pub actual_type: String,
+    pub expected_type: &'static str,
 }
 
 #[derive(Debug, Fail)]
@@ -62,18 +26,3 @@ impl FuncCallError {
         }
     }
 }
-
-// error_chain! {
-//     errors {
-//         TryFromTVMRetValueError(expected_type: String, actual_type_code: i64) {
-//             description("mismatched types while downcasting TVMRetValue")
-//             display("invalid downcast: expected `{}` but was `{}`",
-//                     expected_type, type_code_to_string(actual_type_code))
-//         }
-//     }
-//     foreign_links {
-//         IntoString(std::ffi::IntoStringError);
-//         ParseInt(std::num::ParseIntError);
-//         Utf8(std::str::Utf8Error);
-//     }
-// }

rust/common/src/lib.rs

@@ -1,7 +1,7 @@
 //! This crate contains the refactored basic components required
 //! for `runtime` and `frontend` TVM crates.
 
-#![feature(box_syntax, trait_alias)]
+#![feature(box_syntax, type_alias_enum_variants, trait_alias)]
 
 #[macro_use]
 extern crate failure;