backend: handle deprecated attribute

Signed-off-by: Zixing Liu <liushuyu011@gmail.com>

3 files changed, 18 insertions, 1 deletions

diff --git a/gcc/rust/ast/rust-ast-full-test.cc b/gcc/rust/ast/rust-ast-full-test.cc
index 0d4d36b..8179113 100644
--- a/gcc/rust/ast/rust-ast-full-test.cc
+++ b/gcc/rust/ast/rust-ast-full-test.cc
@@ -20,10 +20,12 @@ along with GCC; see the file COPYING3.  If not see
 // FIXME: This does not work on Windows
 #include <string>
 #include <unistd.h>
+#include <memory>
 
 #include "rust-ast-full.h"
 #include "rust-diagnostics.h"
 #include "rust-ast-visitor.h"
+#include "rust-macro.h"
 #include "rust-session-manager.h"
 #include "rust-lex.h"
 #include "rust-parse.h"
@@ -3862,7 +3864,12 @@ MetaItemInner::~MetaItemInner () = default;
 std::unique_ptr<MetaNameValueStr>
 MetaItemInner::to_meta_name_value_str () const
 {
-  // TODO parse foo = bar
+  if (is_key_value_pair ())
+    {
+      auto converted_item = static_cast<const MetaNameValueStr *> (this);
+      return converted_item->to_meta_name_value_str ();
+    }
+  // TODO actually parse foo = bar
   return nullptr;
 }
 
diff --git a/gcc/rust/ast/rust-ast.h b/gcc/rust/ast/rust-ast.h
index 76324dc..51fe3c4 100644
--- a/gcc/rust/ast/rust-ast.h
+++ b/gcc/rust/ast/rust-ast.h
@@ -645,6 +645,8 @@ public:
   virtual Attribute to_attribute () const { return Attribute::create_empty (); }
 
   virtual bool check_cfg_predicate (const Session &session) const = 0;
+
+  virtual bool is_key_value_pair () const { return false; }
 };
 
 // Container used to store MetaItems as AttrInput (bridge-ish kinda thing)
diff --git a/gcc/rust/ast/rust-macro.h b/gcc/rust/ast/rust-macro.h
index 1bf8912..ce515db 100644
--- a/gcc/rust/ast/rust-macro.h
+++ b/gcc/rust/ast/rust-macro.h
@@ -21,6 +21,7 @@
 
 #include "rust-ast.h"
 #include "rust-location.h"
+#include <string>
 
 namespace Rust {
 namespace AST {
@@ -816,6 +817,13 @@ public:
 
   Attribute to_attribute () const override;
 
+  inline std::pair<Identifier, std::string> get_name_value_pair () const
+  {
+    return std::pair<Identifier, std::string> (ident, str);
+  }
+
+  bool is_key_value_pair () const override { return true; }
+
 protected:
   // Use covariance to implement clone function as returning this type
   MetaNameValueStr *clone_meta_item_inner_impl () const override