rust: Procedural macro for automatic VM declaration

.bumpversion.cfg

@@ -31,6 +31,12 @@ search = version = \"{current_version}\"
 [bumpversion:file:bindings/rust/evmc-vm/Cargo.toml]
 search = version = \"{current_version}\"
 
+[bumpversion:file:bindings/rust/evmc-declare/Cargo.toml]
+search = version = \"{current_version}\"
+
+[bumpversion:file:bindings/rust/evmc-declare-tests/Cargo.toml]
+search = version = \"{current_version}\"
+
 [bumpversion:file:docs/EVMC.md]
 serialize = {major}
 search = ABI version {current_version}

Cargo.toml

@@ -2,5 +2,7 @@
 members = [
     "bindings/rust/evmc-sys",
     "bindings/rust/evmc-vm",
+    "bindings/rust/evmc-declare",
+    "bindings/rust/evmc-declare-tests",
     "examples/example-rust-vm"
 ]

bindings/rust/evmc-declare-tests/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "evmc-declare-tests"
+version = "6.3.0-dev"
+authors = ["Jake Lang <jak3lang@gmail.com>"]
+edition = "2018"
+
+[dependencies]
+evmc-declare = { path = "../evmc-declare" }
+evmc-sys = { path = "../evmc-sys" }
+evmc-vm = { path = "../evmc-vm" }

bindings/rust/evmc-declare-tests/src/lib.rs

@@ -0,0 +1,20 @@
+use evmc_vm::EvmcVm;
+use evmc_vm::ExecutionContext;
+use evmc_vm::ExecutionResult;
+#[macro_use]
+use evmc_declare::evmc_declare_vm;
+
+#[evmc_declare_vm("Foo VM", "ewasm")]
+pub struct FooVM {
+    a: i32,
+}
+
+impl EvmcVm for FooVM {
+    fn init() -> Self {
+        FooVM { a: 105023 }
+    }
+
+    fn execute(&self, code: &[u8], context: &ExecutionContext) -> ExecutionResult {
+        ExecutionResult::new(evmc_sys::evmc_status_code::EVMC_SUCCESS, 235117, None)
+    }
+}

bindings/rust/evmc-declare/Cargo.toml

@@ -0,0 +1,20 @@
+[package]
+name = "evmc-declare"
+version = "6.3.0-dev"
+authors = ["Jake Lang <jak3lang@gmail.com>"]
+edition = "2018"
+
+[dependencies]
+quote = "0.6.12"
+heck = "0.3.1"
+proc-macro2 = "0.4.29"
+
+# For documentation examples
+evmc-vm = { path = "../evmc-vm" }
+
+[dependencies.syn]
+version = "0.15.33"
+features = ["full"]
+
+[lib]
+proc-macro = true