1 files changed, 10 insertions, 0 deletions
diff --git a/libyul/backends/evm/AbstractAssembly.h b/libyul/backends/evm/AbstractAssembly.h
index 97b1d305..1f224ded 100644
--- a/libyul/backends/evm/AbstractAssembly.h
+++ b/libyul/backends/evm/AbstractAssembly.h
@@ -26,6 +26,7 @@
 #include <libdevcore/CommonData.h>
 
 #include <functional>
+#include <memory>
 
 namespace langutil
 {
@@ -52,6 +53,7 @@ class AbstractAssembly
 {
 public:
 	using LabelID = size_t;
+	using SubID = size_t;
 
 	virtual ~AbstractAssembly() {}
 
@@ -98,6 +100,14 @@ public:
 
 	/// Append the assembled size as a constant.
 	virtual void appendAssemblySize() = 0;
+	/// Creates a new sub-assembly, which can be referenced using dataSize and dataOffset.
+	virtual std::pair<std::shared_ptr<AbstractAssembly>, SubID> createSubAssembly() = 0;
+	/// Appends the offset of the given sub-assembly or data.
+	virtual void appendDataOffset(SubID _sub) = 0;
+	/// Appends the size of the given sub-assembly or data.
+	virtual void appendDataSize(SubID _sub) = 0;
+	/// Appends the given data to the assembly and returns its ID.
+	virtual SubID appendData(dev::bytes const& _data) = 0;
 };
 
 enum class IdentifierContext { LValue, RValue };