From a3b620fff73ec762f2a77a077eb8389dddab4833 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Wed, 4 Dec 2024 08:57:27 +0100
Subject: rust: qemu-api-macros: extend error reporting facility to parse
 errors

Generalize the CompileError tuple to an enum, that can be either an error
message or a parse error from syn.

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 rust/qemu-api-macros/src/utils.rs | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 rust/qemu-api-macros/src/utils.rs

(limited to 'rust/qemu-api-macros/src/utils.rs')

diff --git a/rust/qemu-api-macros/src/utils.rs b/rust/qemu-api-macros/src/utils.rs
new file mode 100644
index 0000000000..02c91aed7f
--- /dev/null
+++ b/rust/qemu-api-macros/src/utils.rs
@@ -0,0 +1,26 @@
+// Procedural macro utilities.
+// Author(s): Paolo Bonzini <pbonzini@redhat.com>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+use proc_macro2::Span;
+use quote::quote_spanned;
+
+pub enum MacroError {
+    Message(String, Span),
+    ParseError(syn::Error),
+}
+
+impl From<syn::Error> for MacroError {
+    fn from(err: syn::Error) -> Self {
+        MacroError::ParseError(err)
+    }
+}
+
+impl From<MacroError> for proc_macro2::TokenStream {
+    fn from(err: MacroError) -> Self {
+        match err {
+            MacroError::Message(msg, span) => quote_spanned! { span => compile_error!(#msg); },
+            MacroError::ParseError(err) => err.into_compile_error(),
+        }
+    }
+}
-- 
cgit 1.4.1