Change proc macro definition lookup to optionals

Continue changing the api to use optionals instead of bools and double
pointers.

gcc/rust/ChangeLog:

	* util/rust-hir-map.cc (Mappings::lookup_derive_proc_macro_def):
	Update function to accomodate new signature.
	(Mappings::lookup_bang_proc_macro_def): Likewise.
	(Mappings::lookup_attribute_proc_macro_def): Likewise.
	* util/rust-hir-map.h: Update function signatures.

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

2 files changed, 17 insertions, 18 deletions

diff --git a/gcc/rust/util/rust-hir-map.cc b/gcc/rust/util/rust-hir-map.cc
index 03b5773..20b9d93 100644
--- a/gcc/rust/util/rust-hir-map.cc
+++ b/gcc/rust/util/rust-hir-map.cc
@@ -1029,37 +1029,34 @@ Mappings::insert_attribute_proc_macro_def (NodeId id, AttributeProcMacro macro)
   procmacroAttributeMappings[id] = macro;
 }
 
-bool
-Mappings::lookup_derive_proc_macro_def (NodeId id, CustomDeriveProcMacro &macro)
+tl::optional<CustomDeriveProcMacro &>
+Mappings::lookup_derive_proc_macro_def (NodeId id)
 {
   auto it = procmacroDeriveMappings.find (id);
   if (it == procmacroDeriveMappings.end ())
-    return false;
+    return tl::nullopt;
 
-  macro = it->second;
-  return true;
+  return it->second;
 }
 
-bool
-Mappings::lookup_bang_proc_macro_def (NodeId id, BangProcMacro &macro)
+tl::optional<BangProcMacro &>
+Mappings::lookup_bang_proc_macro_def (NodeId id)
 {
   auto it = procmacroBangMappings.find (id);
   if (it == procmacroBangMappings.end ())
-    return false;
+    return tl::nullopt;
 
-  macro = it->second;
-  return true;
+  return it->second;
 }
 
-bool
-Mappings::lookup_attribute_proc_macro_def (NodeId id, AttributeProcMacro &macro)
+tl::optional<AttributeProcMacro &>
+Mappings::lookup_attribute_proc_macro_def (NodeId id)
 {
   auto it = procmacroAttributeMappings.find (id);
   if (it == procmacroAttributeMappings.end ())
-    return false;
+    return tl::nullopt;
 
-  macro = it->second;
-  return true;
+  return it->second;
 }
 
 void
diff --git a/gcc/rust/util/rust-hir-map.h b/gcc/rust/util/rust-hir-map.h
index f1a8f70..3e6b93f 100644
--- a/gcc/rust/util/rust-hir-map.h
+++ b/gcc/rust/util/rust-hir-map.h
@@ -306,9 +306,11 @@ public:
   void insert_bang_proc_macro_def (NodeId id, BangProcMacro macro);
   void insert_attribute_proc_macro_def (NodeId id, AttributeProcMacro macro);
 
-  bool lookup_derive_proc_macro_def (NodeId id, CustomDeriveProcMacro &macro);
-  bool lookup_bang_proc_macro_def (NodeId id, BangProcMacro &macro);
-  bool lookup_attribute_proc_macro_def (NodeId id, AttributeProcMacro &macro);
+  tl::optional<CustomDeriveProcMacro &>
+  lookup_derive_proc_macro_def (NodeId id);
+  tl::optional<BangProcMacro &> lookup_bang_proc_macro_def (NodeId id);
+  tl::optional<AttributeProcMacro &>
+  lookup_attribute_proc_macro_def (NodeId id);
 
   tl::optional<CustomDeriveProcMacro &>
   lookup_derive_proc_macro_invocation (AST::SimplePath &invoc);