feat(c-api) Move all types into their own modules.

lib/c-api/src/wasm_c_api/trap.rs

@@ -0,0 +1,48 @@
+use super::types::wasm_byte_vec_t;
+use std::mem;
+use std::ptr::NonNull;
+use wasmer::RuntimeError;
+
+// opaque type which is a `RuntimeError`
+#[repr(C)]
+pub struct wasm_trap_t {}
+
+#[no_mangle]
+pub unsafe extern "C" fn wasm_trap_delete(trap: Option<NonNull<wasm_trap_t>>) {
+    if let Some(t_inner) = trap {
+        let _ = Box::from_raw(t_inner.cast::<RuntimeError>().as_ptr());
+    }
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn wasm_trap_message(
+    trap: *const wasm_trap_t,
+    out_ptr: *mut wasm_byte_vec_t,
+) {
+    let re = &*(trap as *const RuntimeError);
+    // this code assumes no nul bytes appear in the message
+    let mut message = format!("{}\0", re);
+    message.shrink_to_fit();
+
+    // TODO use `String::into_raw_parts` when it gets stabilized
+    (*out_ptr).size = message.as_bytes().len();
+    (*out_ptr).data = message.as_mut_ptr();
+    mem::forget(message);
+}
+
+// in trap/RuntimeError we need to store
+// 1. message
+// 2. origin (frame); frame contains:
+//    1. func index
+//    2. func offset
+//    3. module offset
+//    4. which instance this was apart of
+
+/*#[no_mangle]
+pub unsafe extern "C" fn wasm_trap_trace(trap: *const wasm_trap_t, out_ptr: *mut wasm_frame_vec_t) {
+    let re = &*(trap as *const RuntimeError);
+    todo!()
+}*/
+
+//wasm_declare_ref!(trap);
+//wasm_declare_ref!(foreign);