[gcc r15-8624] gccrs: mappings: Add get_lang_item_node

[Arthur Cohen via Gcc-cvs]

https://gcc.gnu.org/g:4d0cfd5b6f179081ab5fa412a8dd1d7762e9403c

commit r15-8624-g4d0cfd5b6f179081ab5fa412a8dd1d7762e9403c
Author: Arthur Cohen <arthur.co...@embecosm.com>
Date:   Thu Dec 26 23:00:08 2024 +0000

    gccrs: mappings: Add get_lang_item_node
    
    This method errors out if the lang item has not been declared yet.
    
    gcc/rust/ChangeLog:
    
            * util/rust-hir-map.cc (Mappings::get_lang_item_node): New.
            * util/rust-hir-map.h: New function.

Diff:
---
 gcc/rust/util/rust-hir-map.cc | 10 ++++++++++
 gcc/rust/util/rust-hir-map.h  |  1 +
 2 files changed, 11 insertions(+)

diff --git a/gcc/rust/util/rust-hir-map.cc b/gcc/rust/util/rust-hir-map.cc
index f11a77954aef..b94591e014c4 100644
--- a/gcc/rust/util/rust-hir-map.cc
+++ b/gcc/rust/util/rust-hir-map.cc
@@ -1299,5 +1299,15 @@ Mappings::lookup_lang_item_node (LangItem::Kind 
item_type)
   return it->second;
 }
 
+NodeId
+Mappings::get_lang_item_node (LangItem::Kind item_type)
+{
+  if (auto lookup = lookup_lang_item_node (item_type))
+    return *lookup;
+
+  rust_fatal_error (UNKNOWN_LOCATION, "failed to find lang item %qs",
+                   LangItem::ToString (item_type).c_str ());
+}
+
 } // namespace Analysis
 } // namespace Rust
diff --git a/gcc/rust/util/rust-hir-map.h b/gcc/rust/util/rust-hir-map.h
index aba51be4827f..21e532812ff7 100644
--- a/gcc/rust/util/rust-hir-map.h
+++ b/gcc/rust/util/rust-hir-map.h
@@ -261,6 +261,7 @@ public:
 
   void insert_lang_item_node (LangItem::Kind item_type, NodeId node_id);
   tl::optional<NodeId &> lookup_lang_item_node (LangItem::Kind item_type);
+  NodeId get_lang_item_node (LangItem::Kind item_type);
 
   // This will fatal_error when this lang item does not exist
   DefId get_lang_item (LangItem::Kind item_type, location_t locus);