[committed 069/103] gccrs: add lang item "phantom_data"

[arthur . cohen]

From: Raiki Tamura <tamaron1...@gmail.com>

gcc/rust/ChangeLog:

        * util/rust-lang-item.h: Add handling for `phantom_data` lang item.

gcc/testsuite/ChangeLog:

        * rust/compile/torture/phantom_data.rs: New test.
---
 gcc/rust/util/rust-lang-item.h                     |  9 +++++++++
 gcc/testsuite/rust/compile/torture/phantom_data.rs | 11 +++++++++++
 2 files changed, 20 insertions(+)
 create mode 100644 gcc/testsuite/rust/compile/torture/phantom_data.rs

diff --git a/gcc/rust/util/rust-lang-item.h b/gcc/rust/util/rust-lang-item.h
index 02eeaee60df..ea0c91aa5f2 100644
--- a/gcc/rust/util/rust-lang-item.h
+++ b/gcc/rust/util/rust-lang-item.h
@@ -73,6 +73,9 @@ public:
     MUT_PTR,
     CONST_SLICE_PTR,
 
+    // https://github.com/rust-lang/rust/blob/master/library/core/src/marker.rs
+    PHANTOM_DATA,
+
     // functions
     FN_ONCE,
     FN_ONCE_OUTPUT,
@@ -222,6 +225,10 @@ public:
       {
        return ItemType::CONST_SLICE_PTR;
       }
+    else if (item.compare ("phantom_data") == 0)
+      {
+       return ItemType::PHANTOM_DATA;
+      }
     else if (item.compare ("fn_once") == 0)
       {
        return ItemType::FN_ONCE;
@@ -308,6 +315,8 @@ public:
        return "mut_ptr";
       case CONST_SLICE_PTR:
        return "const_slice_ptr";
+      case PHANTOM_DATA:
+       return "phantom_data";
       case FN_ONCE:
        return "fn_once";
       case FN_ONCE_OUTPUT:
diff --git a/gcc/testsuite/rust/compile/torture/phantom_data.rs 
b/gcc/testsuite/rust/compile/torture/phantom_data.rs
new file mode 100644
index 00000000000..89e76aeb5eb
--- /dev/null
+++ b/gcc/testsuite/rust/compile/torture/phantom_data.rs
@@ -0,0 +1,11 @@
+// { dg-options "-w" }
+#[lang = "phantom_data"]
+struct PhantomData<T>;
+
+trait Hash {
+    fn hash<H>(&self, state: &mut H);
+}
+
+impl<T> Hash for PhantomData<T> {
+    fn hash<H>(&self, state: &mut H) {}
+}
-- 
2.39.1

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