add assembly-test: wasm-exceptions

tests/assembly/wasm_exceptions.rs

@@ -0,0 +1,60 @@
+// only-wasm32-bare
+// assembly-output: emit-asm
+// compile-flags: -C target-feature=+exception-handling
+// compile-flags: -C panic=unwind
+// compile-flags: -C llvm-args=-wasm-enable-eh
+
+#![crate_type = "lib"]
+#![feature(core_intrinsics)]
+#![feature(rustc_attrs)]
+
+extern {
+    fn may_panic();
+
+    #[rustc_nounwind]
+    fn log_number(number: usize);
+}
+
+struct LogOnDrop;
+
+impl Drop for LogOnDrop {
+    fn drop(&mut self) {
+        unsafe { log_number(0); }
+    }
+}
+
+// CHECK-LABEL: test_cleanup:
+#[no_mangle]
+pub fn test_cleanup() {
+    let _log_on_drop = LogOnDrop;
+    unsafe { may_panic(); }
+
+    // CHECK-NOT: call
+    // CHECK: try
+    // CHECK: call may_panic
+    // CHECK: catch_all
+    // CHECK: rethrow
+    // CHECK: end_try
+}
+
+// CHECK-LABEL: test_rtry:
+#[no_mangle]
+pub fn test_rtry() {
+    unsafe {
+        core::intrinsics::r#try(|_| {
+            may_panic();
+        }, core::ptr::null_mut(), |data, exception| {
+            log_number(data as usize);
+            log_number(exception as usize);
+        });
+    }
+
+    // CHECK-NOT: call
+    // CHECK: try
+    // CHECK: call may_panic
+    // CHECK: catch
+    // CHECK: call log_number
+    // CHECK: call log_number
+    // CHECK-NOT: rethrow
+    // CHECK: end_try
+}