Implementing instantiate and call

lib/runtime-c-api/src/lib.rs

@@ -1,8 +1,9 @@
 extern crate wasmer_runtime;
 
-use std::os::raw::c_char;
-
-use wasmer_runtime::ImportObject;
+use libc::{c_char, c_int, uint32_t, uint8_t};
+use std::ffi::CStr;
+use std::str;
+use wasmer_runtime::{Instance, ImportObject, Value};
 
 #[allow(non_camel_case_types)]
 pub struct wasmer_import_object_t();
@@ -18,6 +19,14 @@ pub enum wasmer_compile_result_t {
     WASMER_COMPILE_ERROR = 2,
 }
 
+#[allow(non_camel_case_types)]
+#[no_mangle]
+#[repr(C)]
+pub enum wasmer_call_result_t {
+    WASMER_CALL_OK = 1,
+    WASMER_CALL_ERROR = 2,
+}
+
 #[no_mangle]
 pub extern "C" fn wasmer_import_object_new() -> *mut wasmer_import_object_t {
     Box::into_raw(Box::new(ImportObject::new())) as *mut wasmer_import_object_t
@@ -35,16 +44,61 @@ pub extern "C" fn wasmer_import_object_destroy(import_object: *mut wasmer_import
 #[no_mangle]
 pub extern "C" fn wasmer_instantiate(
     mut instance: *mut wasmer_instance_t,
-    bytes: *const c_char,
+    wasm_bytes: *mut uint8_t,
+    wasm_bytes_len: uint32_t,
     import_object: *mut wasmer_import_object_t,
 ) -> wasmer_compile_result_t {
     let import_object = unsafe { Box::from_raw(import_object as *mut ImportObject) };
-    let bytes = &[];
+    if wasm_bytes.is_null() {
+        return wasmer_compile_result_t::WASMER_COMPILE_ERROR
+    }
+    let bytes: &[u8] = unsafe { ::std::slice::from_raw_parts_mut(wasm_bytes, wasm_bytes_len as usize) };
     let result = wasmer_runtime::instantiate(bytes, *import_object);
     let new_instance = match result {
         Ok(instance) => instance,
-        Err(error) => return wasmer_compile_result_t::WASMER_COMPILE_ERROR,
+        Err(error) => {
+            println!("Err: {:?}", error);
+            return wasmer_compile_result_t::WASMER_COMPILE_ERROR
+        },
     };
     instance = Box::into_raw(Box::new(new_instance)) as *mut wasmer_instance_t;
     wasmer_compile_result_t::WASMER_COMPILE_OK
 }
+
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub extern "C" fn wasmer_instance_call(instance: *mut wasmer_instance_t,
+                                       name: *const c_char) -> wasmer_call_result_t {
+    // TODO handle params and results
+    if instance.is_null(){
+        println!("Instance null");
+        return wasmer_call_result_t::WASMER_CALL_ERROR;
+    }
+    if name.is_null(){
+        println!("Name null");
+        return wasmer_call_result_t::WASMER_CALL_ERROR;
+    }
+    let func_name_c = unsafe {
+        CStr::from_ptr(name)
+    };
+    let func_name_r = func_name_c.to_str().unwrap();
+    let instance = unsafe { Box::from_raw(instance as *mut Instance) };
+    let result = instance.call(func_name_r, &[Value::I32(1), Value::I32(2)]);
+    match result {
+        Ok(res) => {
+            wasmer_call_result_t::WASMER_CALL_OK
+        },
+        Err(err) => {
+            println!("Err: {:?}", err);
+            wasmer_call_result_t::WASMER_CALL_ERROR
+        }
+    }
+}
+
+#[allow(clippy::cast_ptr_alignment)]
+#[no_mangle]
+pub extern "C" fn wasmer_instance_destroy(instance: *mut wasmer_instance_t) {
+    if !instance.is_null() {
+        drop(unsafe { Box::from_raw(instance as *mut Instance) });
+    }
+}