gccrs: Add proc macro top level discovery

Add mechanism to discover proc macros in loaded extern crates. In the
top level resolver.

gcc/rust/ChangeLog:

	* resolve/rust-toplevel-name-resolver-2.0.cc (TopLevel::go):
	Visit crate's newly stored proc macros.
	* rust-session-manager.cc (Session::load_extern_crate):
	Store proc macros in the parsed crate instead of a local
	variable to achieve mappings.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

1 files changed, 6 insertions, 13 deletions

diff --git a/gcc/rust/rust-session-manager.cc b/gcc/rust/rust-session-manager.cc
index 292506d..6f2657c 100644
--- a/gcc/rust/rust-session-manager.cc
+++ b/gcc/rust/rust-session-manager.cc
@@ -1053,34 +1053,27 @@ Session::load_extern_crate (const std::string &crate_name, location_t locus)
   Parser<Lexer> parser (lex);
   std::unique_ptr<AST::Crate> metadata_crate = parser.parse_crate ();
 
-  std::vector<ProcMacro::Attribute> attribute_macros;
-  std::vector<ProcMacro::CustomDerive> derive_macros;
-  std::vector<ProcMacro::Bang> bang_macros;
+  AST::Crate &parsed_crate
+    = mappings->insert_ast_crate (std::move (metadata_crate), crate_num);
+
   for (auto &macro : extern_crate.get_proc_macros ())
     {
       switch (macro.tag)
 	{
 	case ProcMacro::CUSTOM_DERIVE:
-	  derive_macros.push_back (macro.payload.custom_derive);
+	  parsed_crate.add_derive_macro (macro.payload.custom_derive);
 	  break;
 	case ProcMacro::ATTR:
-	  attribute_macros.push_back (macro.payload.attribute);
+	  parsed_crate.add_attribute_macro (macro.payload.attribute);
 	  break;
 	case ProcMacro::BANG:
-	  bang_macros.push_back (macro.payload.bang);
+	  parsed_crate.add_bang_macro (macro.payload.bang);
 	  break;
 	default:
 	  gcc_unreachable ();
 	}
     }
 
-  mappings->insert_attribute_proc_macros (crate_num, attribute_macros);
-  mappings->insert_derive_proc_macros (crate_num, derive_macros);
-  mappings->insert_bang_proc_macros (crate_num, bang_macros);
-
-  AST::Crate &parsed_crate
-    = mappings->insert_ast_crate (std::move (metadata_crate), crate_num);
-
   // name resolve it
   Resolver::NameResolution::Resolve (parsed_crate);