From b54273e37e38ec5b53c0aa7c142632bd8ad68288 Mon Sep 17 00:00:00 2001
From: Djordje Mijovic <djordje.mijovic@gmail.com>
Date: Thu, 10 Dec 2020 12:03:39 +0100
Subject: [PATCH] [Sol->Yul] Implementing read from storage for array types.

---
 libsolidity/codegen/YulUtilFunctions.cpp                     | 5 +++++
 .../semanticTests/structs/memory_structs_read_write.sol      | 3 ++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/libsolidity/codegen/YulUtilFunctions.cpp b/libsolidity/codegen/YulUtilFunctions.cpp
index 2407fa548..26314e4ad 100644
--- a/libsolidity/codegen/YulUtilFunctions.cpp
+++ b/libsolidity/codegen/YulUtilFunctions.cpp
@@ -2203,6 +2203,11 @@ string YulUtilFunctions::readFromStorageValueType(Type const& _type, optional<si
 
 string YulUtilFunctions::readFromStorageReferenceType(Type const& _type)
 {
+	if (auto const* arrayType = dynamic_cast<ArrayType const*>(&_type))
+		return copyArrayFromStorageToMemoryFunction(
+			dynamic_cast<ArrayType const&>(*arrayType->copyForLocation(DataLocation::Storage, false)),
+			*arrayType
+		);
 	solUnimplementedAssert(_type.category() == Type::Category::Struct, "");
 
 	string functionName = "read_from_storage_reference_type_" + _type.identifier();
diff --git a/test/libsolidity/semanticTests/structs/memory_structs_read_write.sol b/test/libsolidity/semanticTests/structs/memory_structs_read_write.sol
index 105f59909..9045a3076 100644
--- a/test/libsolidity/semanticTests/structs/memory_structs_read_write.sol
+++ b/test/libsolidity/semanticTests/structs/memory_structs_read_write.sol
@@ -49,7 +49,8 @@ contract Test {
         a = s.a[1];
     }
 }
-
+// ====
+// compileViaYul: also
 // ----
 // testInit() -> 0, 0, 0, 0, true
 // testCopyRead() -> 1, 2, 3, 4