From d4e6b64e7f9e23aeb5d3c40665f18091575921ed Mon Sep 17 00:00:00 2001
From: Philip Herron <herron.philip@googlemail.com>
Date: Tue, 31 Jan 2023 14:39:29 +0000
Subject: [PATCH] gccrs: Add missing Sized, Copy and Clone lang item mappings

We need these lang items to be defined and later down the line the mappings
will be used to implement proper copy and clone logic.

Fixes #1786

Signed-off-by: Philip Herron <herron.philip@googlemail.com>

gcc/rust/ChangeLog:

	* util/rust-lang-item.h:

gcc/testsuite/ChangeLog:

	* rust/compile/issue-1786.rs: New test.
---
 gcc/rust/util/rust-lang-item.h           | 24 ++++++++++++++++++++++++
 gcc/testsuite/rust/compile/issue-1786.rs | 23 +++++++++++++++++++++++
 2 files changed, 47 insertions(+)
 create mode 100644 gcc/testsuite/rust/compile/issue-1786.rs

diff --git a/gcc/rust/util/rust-lang-item.h b/gcc/rust/util/rust-lang-item.h
index 52f53fa3f93d..5bad08ae7c10 100644
--- a/gcc/rust/util/rust-lang-item.h
+++ b/gcc/rust/util/rust-lang-item.h
@@ -80,6 +80,12 @@ public:
     FN_ONCE,
     FN_ONCE_OUTPUT,
 
+    // markers
+    COPY,
+    CLONE,
+    SIZED,
+
+    // delimiter
     UNKNOWN,
   };
 
@@ -237,6 +243,18 @@ public:
       {
 	return ItemType::FN_ONCE_OUTPUT;
       }
+    else if (item.compare ("copy") == 0)
+      {
+	return ItemType::COPY;
+      }
+    else if (item.compare ("clone") == 0)
+      {
+	return ItemType::CLONE;
+      }
+    else if (item.compare ("sized") == 0)
+      {
+	return ItemType::SIZED;
+      }
 
     return ItemType::UNKNOWN;
   }
@@ -321,6 +339,12 @@ public:
 	return "fn_once";
       case FN_ONCE_OUTPUT:
 	return "fn_once_output";
+      case COPY:
+	return "copy";
+      case CLONE:
+	return "clone";
+      case SIZED:
+	return "sized";
 
       case UNKNOWN:
 	return "<UNKNOWN>";
diff --git a/gcc/testsuite/rust/compile/issue-1786.rs b/gcc/testsuite/rust/compile/issue-1786.rs
new file mode 100644
index 000000000000..f73b63d0cb67
--- /dev/null
+++ b/gcc/testsuite/rust/compile/issue-1786.rs
@@ -0,0 +1,23 @@
+#[lang = "clone"]
+trait Clone {
+    fn clone(&self) -> Self;
+
+    fn clone_from(&mut self, source: &Self) {
+        *self = source.clone()
+    }
+}
+
+#[lang = "copy"]
+pub trait Copy: Clone {
+    // Empty.
+}
+
+mod impls {
+    use super::Clone;
+
+    impl Clone for char {
+        fn clone(&self) -> Self {
+            *self
+        }
+    }
+}
-- 
2.47.2