chore: add more examples, refactoring

Signed-off-by: Henry Gressmann <mail@henrygressmann.de>

1 files changed, 41 insertions, 0 deletions

diff --git a/examples/linking.rs b/examples/linking.rs
new file mode 100644
index 0000000..f278266
--- /dev/null
+++ b/examples/linking.rs
@@ -0,0 +1,41 @@
+use color_eyre::eyre::Result;
+use tinywasm::{Module, Store};
+
+const WASM_ADD: &str = r#"
+(module
+  (func $add (param $lhs i32) (param $rhs i32) (result i32)
+    local.get $lhs
+    local.get $rhs
+    i32.add)
+  (export "add" (func $add)))
+"#;
+
+const WASM_IMPORT: &str = r#"
+(module
+  (import "adder" "add" (func $add (param i32 i32) (result i32)))
+  (func $main (result i32)
+    i32.const 1
+    i32.const 2
+    call $add)
+  (export "main" (func $main))
+)
+"#;
+
+fn main() -> Result<()> {
+    let wasm_add = wat::parse_str(WASM_ADD).expect("failed to parse wat");
+    let wasm_import = wat::parse_str(WASM_IMPORT).expect("failed to parse wat");
+
+    let add_module = Module::parse_bytes(&wasm_add)?;
+    let import_module = Module::parse_bytes(&wasm_import)?;
+
+    let mut store = Store::default();
+    let add_instance = add_module.instantiate(&mut store, None)?;
+
+    let mut imports = tinywasm::Imports::new();
+    imports.link_module("adder", add_instance.id())?;
+    let import_instance = import_module.instantiate(&mut store, Some(imports))?;
+
+    let main = import_instance.exported_func::<(), i32>(&store, "main")?;
+    assert_eq!(main.call(&mut store, ())?, 3);
+    Ok(())
+}