add windows exception handling in C (#175)

lib/win-exception-handler/src/exception_handling.rs

@@ -0,0 +1,55 @@
+use std::ffi::c_void;
+use wasmer_runtime_core::vm::{Ctx, Func};
+
+type Trampoline = unsafe extern "C" fn(*mut Ctx, *const Func, *const u64, *mut u64) -> c_void;
+type CallProtectedResult = Result<(), CallProtectedData>;
+
+#[repr(C)]
+pub struct CallProtectedData {
+    pub code: u64,
+    pub exceptionAddress: u64,
+    pub instructionPointer: u64,
+}
+
+extern "C" {
+    #[link_name = "callProtected"]
+    pub fn __call_protected(
+        trampoline: Trampoline,
+        ctx: *mut Ctx,
+        func: *const Func,
+        param_vec: *const u64,
+        return_vec: *mut u64,
+        out_result: *mut CallProtectedData,
+    ) -> u8;
+}
+
+pub fn _call_protected(
+    trampoline: Trampoline,
+    ctx: *mut Ctx,
+    func: *const Func,
+    param_vec: *const u64,
+    return_vec: *mut u64,
+) -> CallProtectedResult {
+    let mut out_result = CallProtectedData {
+        code: 0,
+        exceptionAddress: 0,
+        instructionPointer: 0,
+    };
+    let result = unsafe {
+        __call_protected(
+            trampoline,
+            ctx,
+            func,
+            param_vec,
+            return_vec,
+            &mut out_result,
+        )
+    };
+    println!("result from __call_protected: {}", result);
+    if result == 1 {
+        Ok(())
+    } else {
+        println!("returning error from _call_protected");
+        Err(out_result)
+    }
+}

lib/win-exception-handler/src/lib.rs

@@ -0,0 +1,5 @@
+#[cfg(windows)]
+mod exception_handling;
+
+#[cfg(windows)]
+pub use self::exception_handling::*;