Add dart to rust example

dart-to-rust/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "dart-to-rust"
+version = "0.1.0"
+authors = ["Zmant <zmant724@aliyun.com"]
+
+[lib]
+name = "rust_add"
+crate-type = ["cdylib"]

dart-to-rust/Makefile

@@ -0,0 +1,18 @@
+ifeq ($(shell uname),Darwin)
+    LDFLAGS := -Wl,-dead_strip
+else
+    LDFLAGS := -Wl,--gc-sections -lpthread -ldl
+endif
+
+all: target/debug/librust_add.so
+	dart src/main.dart
+
+target/debug/librust_add.so: src/lib.rs Cargo.toml
+	cargo build
+
+target/main.o: src/main.c | target
+	$(CC) -o $@ -c $<
+
+clean:
+	rm -rf target
+	rm -rf Cargo.lock

dart-to-rust/src/lib.rs

@@ -0,0 +1,5 @@
+
+#[no_mangle]
+pub extern fn rust_add(a: i32, b: i32) -> i32 {
+    a + b
+}

dart-to-rust/src/main.dart

@@ -0,0 +1,12 @@
+
+import 'dart:ffi' as ffi;
+
+typedef NativeRustAddFunction = ffi.Int32 Function(ffi.Int32, ffi.Int32);
+typedef NativeAddFunction = int Function(int, int);
+
+main() {
+  ffi.DynamicLibrary dl = ffi.DynamicLibrary.open("target/debug/librust_add.so");
+  var add = dl.lookupFunction<NativeRustAddFunction, NativeAddFunction>("rust_add");
+  var number = add(12,13);
+  print("call rust function add(12,13)=$number");
+}