From 58f7a27ee0336423fa7dc76b8a160b78301bbdd2 Mon Sep 17 00:00:00 2001
From: Alex Beregszaszi <alex@rtfs.hu>
Date: Tue, 27 Jun 2017 10:25:36 +0100
Subject: Add sig member on function type

---
 libsolidity/ast/Types.cpp                  | 5 +++++
 libsolidity/codegen/ExpressionCompiler.cpp | 9 ++++++++-
 2 files changed, 13 insertions(+), 1 deletion(-)

(limited to 'libsolidity')

diff --git a/libsolidity/ast/Types.cpp b/libsolidity/ast/Types.cpp
index 10424858..5aa52383 100644
--- a/libsolidity/ast/Types.cpp
+++ b/libsolidity/ast/Types.cpp
@@ -2436,6 +2436,11 @@ MemberList::MemberMap FunctionType::nativeMembers(ContractDefinition const*) con
 	case Kind::BareDelegateCall:
 	{
 		MemberList::MemberMap members;
+		if (m_kind == Kind::External)
+			members.push_back(MemberList::Member(
+				"sig",
+				make_shared<FixedBytesType>(4)
+			));
 		if (m_kind != Kind::BareDelegateCall && m_kind != Kind::DelegateCall)
 		{
 			if (isPayable())
diff --git a/libsolidity/codegen/ExpressionCompiler.cpp b/libsolidity/codegen/ExpressionCompiler.cpp
index 5c9b743a..b7aadc12 100644
--- a/libsolidity/codegen/ExpressionCompiler.cpp
+++ b/libsolidity/codegen/ExpressionCompiler.cpp
@@ -1068,7 +1068,14 @@ bool ExpressionCompiler::visit(MemberAccess const& _memberAccess)
 			solAssert(false, "Invalid member access to integer");
 		break;
 	case Type::Category::Function:
-		solAssert(!!_memberAccess.expression().annotation().type->memberType(member),
+		if (member == "sig")
+		{
+			m_context << Instruction::SWAP1 << Instruction::POP;
+			/// need to store store it as bytes4
+			utils().leftShiftNumberOnStack(224);
+		}
+		else
+			solAssert(!!_memberAccess.expression().annotation().type->memberType(member),
 				 "Invalid member access to function.");
 		break;
 	case Type::Category::Magic:
-- 
cgit