Emit loop initializer for repeat arrays

This commit changes how arrays of repeating elements, e.g. [5; 12] are
compiled. Rather than create a constructor which explicitly initializes
each element to the given value (which causes compiler OOM for large
arrays), we emit instructions to allocate the array then initialize the
elements in a loop.

However, we can only take this approach outside of const contexts -
const arrays must still use the old approach.

1 files changed, 4 insertions, 0 deletions

diff --git a/gcc/rust/rust-backend.h b/gcc/rust/rust-backend.h
index 6bfebe3..17b7bae 100644
--- a/gcc/rust/rust-backend.h
+++ b/gcc/rust/rust-backend.h
@@ -275,6 +275,10 @@ public:
 				const std::vector<tree> &vals, Location)
     = 0;
 
+  virtual tree array_initializer (tree, tree, tree, tree, tree, tree *,
+				  Location)
+    = 0;
+
   // Return an expression for ARRAY[INDEX] as an l-value.  ARRAY is a valid
   // fixed-length array, not a slice.
   virtual tree array_index_expression (tree array, tree index, Location) = 0;