diff --git a/Changelog.md b/Changelog.md
index a6d9ab65f..e0d9a9fef 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -38,6 +38,7 @@ Language Features:
  * Introduce ``virtual`` and ``override`` keywords.
  * Modify ``push(element)`` for dynamic storage arrays such that it does not return the new length anymore.
  * Yul: Introduce ``leave`` statement that exits the current function.
+ * JSON AST: Add the function selector of each externally-visible FunctonDefinition to the AST JSON export.
 
 Compiler Features:
  * Allow revert strings to be stripped from the binary using the ``--revert-strings`` option or the ``settings.debug.revertStrings`` setting.
diff --git a/libsolidity/ast/AST.cpp b/libsolidity/ast/AST.cpp
index 34035d536..140fe7a99 100644
--- a/libsolidity/ast/AST.cpp
+++ b/libsolidity/ast/AST.cpp
@@ -368,6 +368,11 @@ string FunctionDefinition::externalSignature() const
 	return TypeProvider::function(*this)->externalSignature();
 }
 
+string FunctionDefinition::externalIdentifierHex() const
+{
+	return TypeProvider::function(*this)->externalIdentifierHex();
+}
+
 FunctionDefinitionAnnotation& FunctionDefinition::annotation() const
 {
 	if (!m_annotation)
@@ -596,6 +601,12 @@ set<VariableDeclaration::Location> VariableDeclaration::allowedDataLocations() c
 		return set<Location>{ Location::Unspecified };
 }
 
+string VariableDeclaration::externalIdentifierHex() const
+{
+	solAssert(isStateVariable() && isPublic(), "Can only be called for public state variables");
+	return TypeProvider::function(*this)->externalIdentifierHex();
+}
+
 TypePointer VariableDeclaration::type() const
 {
 	return annotation().type;
diff --git a/libsolidity/ast/AST.h b/libsolidity/ast/AST.h
index 7ca665890..f761fe7af 100644
--- a/libsolidity/ast/AST.h
+++ b/libsolidity/ast/AST.h
@@ -708,6 +708,9 @@ public:
 	/// arguments separated by commas all enclosed in parentheses without any spaces.
 	std::string externalSignature() const;
 
+	/// @returns the external identifier of this function (the hash of the signature) as a hex string.
+	std::string externalIdentifierHex() const;
+
 	ContractDefinition::ContractKind inContractKind() const;
 
 	TypePointer type() const override;
@@ -807,6 +810,9 @@ public:
 	/// @returns a set of allowed storage locations for the variable.
 	std::set<Location> allowedDataLocations() const;
 
+	/// @returns the external identifier of this variable (the hash of the signature) as a hex string (works only for public state variables).
+	std::string externalIdentifierHex() const;
+
 	TypePointer type() const override;
 
 	/// @param _internal false indicates external interface is concerned, true indicates internal interface is concerned.
diff --git a/libsolidity/ast/ASTJsonConverter.cpp b/libsolidity/ast/ASTJsonConverter.cpp
index 798b71b88..b7b8e9cbc 100644
--- a/libsolidity/ast/ASTJsonConverter.cpp
+++ b/libsolidity/ast/ASTJsonConverter.cpp
@@ -362,6 +362,8 @@ bool ASTJsonConverter::visit(FunctionDefinition const& _node)
 		make_pair("implemented", _node.isImplemented()),
 		make_pair("scope", idOrNull(_node.scope()))
 	};
+	if (_node.isPartOfExternalInterface())
+		attributes.emplace_back("functionSelector", _node.externalIdentifierHex());
 	if (!_node.annotation().baseFunctions.empty())
 		attributes.emplace_back(make_pair("baseFunctions", getContainerIds(_node.annotation().baseFunctions, true)));
 	if (m_legacy)
@@ -384,6 +386,8 @@ bool ASTJsonConverter::visit(VariableDeclaration const& _node)
 		make_pair("scope", idOrNull(_node.scope())),
 		make_pair("typeDescriptions", typePointerToJson(_node.annotation().type, true))
 	};
+	if (_node.isStateVariable() && _node.isPublic())
+		attributes.emplace_back("functionSelector", _node.externalIdentifierHex());
 	if (m_inEvent)
 		attributes.emplace_back("indexed", _node.isIndexed());
 	if (!_node.annotation().baseFunctions.empty())
diff --git a/libsolidity/ast/Types.cpp b/libsolidity/ast/Types.cpp
index bf407b112..b8228f121 100644
--- a/libsolidity/ast/Types.cpp
+++ b/libsolidity/ast/Types.cpp
@@ -3174,6 +3174,11 @@ u256 FunctionType::externalIdentifier() const
 	return FixedHash<4>::Arith(FixedHash<4>(dev::keccak256(externalSignature())));
 }
 
+string FunctionType::externalIdentifierHex() const
+{
+	return FixedHash<4>(dev::keccak256(externalSignature())).hex();
+}
+
 bool FunctionType::isPure() const
 {
 	// TODO: replace this with m_stateMutability == StateMutability::Pure once
diff --git a/libsolidity/ast/Types.h b/libsolidity/ast/Types.h
index 588e8b8cf..3bc2aa0ae 100644
--- a/libsolidity/ast/Types.h
+++ b/libsolidity/ast/Types.h
@@ -1190,6 +1190,8 @@ public:
 	std::string externalSignature() const;
 	/// @returns the external identifier of this function (the hash of the signature).
 	u256 externalIdentifier() const;
+	/// @returns the external identifier of this function (the hash of the signature) as a hex string.
+	std::string externalIdentifierHex() const;
 	Declaration const& declaration() const
 	{
 		solAssert(m_declaration, "Requested declaration from a FunctionType that has none");
diff --git a/test/cmdlineTests/recovery_ast_constructor/output b/test/cmdlineTests/recovery_ast_constructor/output
index ce6a9c935..e7dd79791 100644
--- a/test/cmdlineTests/recovery_ast_constructor/output
+++ b/test/cmdlineTests/recovery_ast_constructor/output
@@ -123,6 +123,7 @@ JSON AST:
           "attributes":
           {
             "documentation": null,
+            "functionSelector": "af11c34c",
             "implemented": true,
             "isConstructor": false,
             "kind": "function",
diff --git a/test/cmdlineTests/standard_only_ast_requested/output.json b/test/cmdlineTests/standard_only_ast_requested/output.json
index d5622c85a..6ba921abf 100644
--- a/test/cmdlineTests/standard_only_ast_requested/output.json
+++ b/test/cmdlineTests/standard_only_ast_requested/output.json
@@ -1 +1 @@
-{"sources":{"A":{"ast":{"absolutePath":"A","exportedSymbols":{"C":[6]},"id":7,"nodeType":"SourceUnit","nodes":[{"id":1,"literals":["solidity",">=","0.0"],"nodeType":"PragmaDirective","src":"0:22:0"},{"abstract":false,"baseContracts":[],"contractDependencies":[],"contractKind":"contract","documentation":null,"fullyImplemented":true,"id":6,"linearizedBaseContracts":[6],"name":"C","nodeType":"ContractDefinition","nodes":[{"body":{"id":4,"nodeType":"Block","src":"61:2:0","statements":[]},"documentation":null,"id":5,"implemented":true,"kind":"function","modifiers":[],"name":"f","nodeType":"FunctionDefinition","overrides":null,"parameters":{"id":2,"nodeType":"ParameterList","parameters":[],"src":"46:2:0"},"returnParameters":{"id":3,"nodeType":"ParameterList","parameters":[],"src":"61:0:0"},"scope":6,"src":"36:27:0","stateMutability":"pure","virtual":false,"visibility":"public"}],"scope":7,"src":"23:42:0"}],"src":"0:65:0"},"id":0}}}
+{"sources":{"A":{"ast":{"absolutePath":"A","exportedSymbols":{"C":[6]},"id":7,"nodeType":"SourceUnit","nodes":[{"id":1,"literals":["solidity",">=","0.0"],"nodeType":"PragmaDirective","src":"0:22:0"},{"abstract":false,"baseContracts":[],"contractDependencies":[],"contractKind":"contract","documentation":null,"fullyImplemented":true,"id":6,"linearizedBaseContracts":[6],"name":"C","nodeType":"ContractDefinition","nodes":[{"body":{"id":4,"nodeType":"Block","src":"61:2:0","statements":[]},"documentation":null,"functionSelector":"26121ff0","id":5,"implemented":true,"kind":"function","modifiers":[],"name":"f","nodeType":"FunctionDefinition","overrides":null,"parameters":{"id":2,"nodeType":"ParameterList","parameters":[],"src":"46:2:0"},"returnParameters":{"id":3,"nodeType":"ParameterList","parameters":[],"src":"61:0:0"},"scope":6,"src":"36:27:0","stateMutability":"pure","virtual":false,"visibility":"public"}],"scope":7,"src":"23:42:0"}],"src":"0:65:0"},"id":0}}}
diff --git a/test/libsolidity/ASTJSON/address_payable.json b/test/libsolidity/ASTJSON/address_payable.json
index 88439df4a..fbab520af 100644
--- a/test/libsolidity/ASTJSON/address_payable.json
+++ b/test/libsolidity/ASTJSON/address_payable.json
@@ -29,6 +29,7 @@
       [
         {
           "constant": false,
+          "functionSelector": "97682884",
           "id": 4,
           "name": "m",
           "nodeType": "VariableDeclaration",
@@ -489,6 +490,7 @@
             ]
           },
           "documentation": null,
+          "functionSelector": "fc68521a",
           "id": 38,
           "implemented": true,
           "kind": "function",
diff --git a/test/libsolidity/ASTJSON/address_payable_legacy.json b/test/libsolidity/ASTJSON/address_payable_legacy.json
index 0b36e3ebd..b5f4cf2ff 100644
--- a/test/libsolidity/ASTJSON/address_payable_legacy.json
+++ b/test/libsolidity/ASTJSON/address_payable_legacy.json
@@ -40,6 +40,7 @@
           "attributes":
           {
             "constant": false,
+            "functionSelector": "97682884",
             "name": "m",
             "overrides": null,
             "scope": 39,
@@ -93,6 +94,7 @@
           "attributes":
           {
             "documentation": null,
+            "functionSelector": "fc68521a",
             "implemented": true,
             "isConstructor": false,
             "kind": "function",
diff --git a/test/libsolidity/ASTJSON/assembly/call.json b/test/libsolidity/ASTJSON/assembly/call.json
index 60b626076..25558da84 100644
--- a/test/libsolidity/ASTJSON/assembly/call.json
+++ b/test/libsolidity/ASTJSON/assembly/call.json
@@ -132,6 +132,7 @@
             ]
           },
           "documentation": null,
+          "functionSelector": "b582ec5f",
           "id": 5,
           "implemented": true,
           "kind": "function",
diff --git a/test/libsolidity/ASTJSON/assembly/call_legacy.json b/test/libsolidity/ASTJSON/assembly/call_legacy.json
index afb4690e7..478365834 100644
--- a/test/libsolidity/ASTJSON/assembly/call_legacy.json
+++ b/test/libsolidity/ASTJSON/assembly/call_legacy.json
@@ -40,6 +40,7 @@
           "attributes":
           {
             "documentation": null,
+            "functionSelector": "b582ec5f",
             "implemented": true,
             "isConstructor": false,
             "kind": "function",
diff --git a/test/libsolidity/ASTJSON/assembly/function.json b/test/libsolidity/ASTJSON/assembly/function.json
index 58ff22cf7..93a5be76a 100644
--- a/test/libsolidity/ASTJSON/assembly/function.json
+++ b/test/libsolidity/ASTJSON/assembly/function.json
@@ -119,6 +119,7 @@
             ]
           },
           "documentation": null,
+          "functionSelector": "b8c9d365",
           "id": 5,
           "implemented": true,
           "kind": "function",
diff --git a/test/libsolidity/ASTJSON/assembly/function_legacy.json b/test/libsolidity/ASTJSON/assembly/function_legacy.json
index ec13e011a..9af45691c 100644
--- a/test/libsolidity/ASTJSON/assembly/function_legacy.json
+++ b/test/libsolidity/ASTJSON/assembly/function_legacy.json
@@ -40,6 +40,7 @@
           "attributes":
           {
             "documentation": null,
+            "functionSelector": "b8c9d365",
             "implemented": true,
             "isConstructor": false,
             "kind": "function",
diff --git a/test/libsolidity/ASTJSON/assembly/leave.json b/test/libsolidity/ASTJSON/assembly/leave.json
index 625e2118a..0ccbab2cf 100644
--- a/test/libsolidity/ASTJSON/assembly/leave.json
+++ b/test/libsolidity/ASTJSON/assembly/leave.json
@@ -69,6 +69,7 @@
             ]
           },
           "documentation": null,
+          "functionSelector": "ece866b9",
           "id": 5,
           "implemented": true,
           "kind": "function",
diff --git a/test/libsolidity/ASTJSON/assembly/leave_legacy.json b/test/libsolidity/ASTJSON/assembly/leave_legacy.json
index 7b80029f2..a1a4f7591 100644
--- a/test/libsolidity/ASTJSON/assembly/leave_legacy.json
+++ b/test/libsolidity/ASTJSON/assembly/leave_legacy.json
@@ -40,6 +40,7 @@
           "attributes":
           {
             "documentation": null,
+            "functionSelector": "ece866b9",
             "implemented": true,
             "isConstructor": false,
             "kind": "function",
diff --git a/test/libsolidity/ASTJSON/assembly/loop.json b/test/libsolidity/ASTJSON/assembly/loop.json
index f10e8d371..9ad3f4f88 100644
--- a/test/libsolidity/ASTJSON/assembly/loop.json
+++ b/test/libsolidity/ASTJSON/assembly/loop.json
@@ -132,6 +132,7 @@
             ]
           },
           "documentation": null,
+          "functionSelector": "e2179b8e",
           "id": 5,
           "implemented": true,
           "kind": "function",
diff --git a/test/libsolidity/ASTJSON/assembly/loop_legacy.json b/test/libsolidity/ASTJSON/assembly/loop_legacy.json
index fd67460c1..109962d01 100644
--- a/test/libsolidity/ASTJSON/assembly/loop_legacy.json
+++ b/test/libsolidity/ASTJSON/assembly/loop_legacy.json
@@ -40,6 +40,7 @@
           "attributes":
           {
             "documentation": null,
+            "functionSelector": "e2179b8e",
             "implemented": true,
             "isConstructor": false,
             "kind": "function",
diff --git a/test/libsolidity/ASTJSON/assembly/slot_offset.json b/test/libsolidity/ASTJSON/assembly/slot_offset.json
index fc02ed2e7..e7f4c6089 100644
--- a/test/libsolidity/ASTJSON/assembly/slot_offset.json
+++ b/test/libsolidity/ASTJSON/assembly/slot_offset.json
@@ -200,6 +200,7 @@
             ]
           },
           "documentation": null,
+          "functionSelector": "ffae15ba",
           "id": 10,
           "implemented": true,
           "kind": "function",
diff --git a/test/libsolidity/ASTJSON/assembly/slot_offset_legacy.json b/test/libsolidity/ASTJSON/assembly/slot_offset_legacy.json
index 5c677f0b2..51783a58b 100644
--- a/test/libsolidity/ASTJSON/assembly/slot_offset_legacy.json
+++ b/test/libsolidity/ASTJSON/assembly/slot_offset_legacy.json
@@ -117,6 +117,7 @@
           "attributes":
           {
             "documentation": null,
+            "functionSelector": "ffae15ba",
             "implemented": true,
             "isConstructor": false,
             "kind": "function",
diff --git a/test/libsolidity/ASTJSON/assembly/stringlit.json b/test/libsolidity/ASTJSON/assembly/stringlit.json
index 623c4c72b..1f328d970 100644
--- a/test/libsolidity/ASTJSON/assembly/stringlit.json
+++ b/test/libsolidity/ASTJSON/assembly/stringlit.json
@@ -73,6 +73,7 @@
             ]
           },
           "documentation": null,
+          "functionSelector": "5a2ee019",
           "id": 5,
           "implemented": true,
           "kind": "function",
diff --git a/test/libsolidity/ASTJSON/assembly/stringlit_legacy.json b/test/libsolidity/ASTJSON/assembly/stringlit_legacy.json
index 19d900525..549ed5b40 100644
--- a/test/libsolidity/ASTJSON/assembly/stringlit_legacy.json
+++ b/test/libsolidity/ASTJSON/assembly/stringlit_legacy.json
@@ -40,6 +40,7 @@
           "attributes":
           {
             "documentation": null,
+            "functionSelector": "5a2ee019",
             "implemented": true,
             "isConstructor": false,
             "kind": "function",
diff --git a/test/libsolidity/ASTJSON/assembly/switch.json b/test/libsolidity/ASTJSON/assembly/switch.json
index 0d09a23b4..b159fb8e4 100644
--- a/test/libsolidity/ASTJSON/assembly/switch.json
+++ b/test/libsolidity/ASTJSON/assembly/switch.json
@@ -165,6 +165,7 @@
             ]
           },
           "documentation": null,
+          "functionSelector": "26121ff0",
           "id": 5,
           "implemented": true,
           "kind": "function",
diff --git a/test/libsolidity/ASTJSON/assembly/switch_legacy.json b/test/libsolidity/ASTJSON/assembly/switch_legacy.json
index 50d37f6fd..ea3bfd3d1 100644
--- a/test/libsolidity/ASTJSON/assembly/switch_legacy.json
+++ b/test/libsolidity/ASTJSON/assembly/switch_legacy.json
@@ -40,6 +40,7 @@
           "attributes":
           {
             "documentation": null,
+            "functionSelector": "26121ff0",
             "implemented": true,
             "isConstructor": false,
             "kind": "function",
diff --git a/test/libsolidity/ASTJSON/assembly/var_access.json b/test/libsolidity/ASTJSON/assembly/var_access.json
index 246d15d09..d6f02aa7d 100644
--- a/test/libsolidity/ASTJSON/assembly/var_access.json
+++ b/test/libsolidity/ASTJSON/assembly/var_access.json
@@ -124,6 +124,7 @@
             ]
           },
           "documentation": null,
+          "functionSelector": "26121ff0",
           "id": 8,
           "implemented": true,
           "kind": "function",
diff --git a/test/libsolidity/ASTJSON/assembly/var_access_legacy.json b/test/libsolidity/ASTJSON/assembly/var_access_legacy.json
index 2e6968be1..595da142b 100644
--- a/test/libsolidity/ASTJSON/assembly/var_access_legacy.json
+++ b/test/libsolidity/ASTJSON/assembly/var_access_legacy.json
@@ -40,6 +40,7 @@
           "attributes":
           {
             "documentation": null,
+            "functionSelector": "26121ff0",
             "implemented": true,
             "isConstructor": false,
             "kind": "function",
diff --git a/test/libsolidity/ASTJSON/documentation.json b/test/libsolidity/ASTJSON/documentation.json
index 4d4458470..8c700498c 100644
--- a/test/libsolidity/ASTJSON/documentation.json
+++ b/test/libsolidity/ASTJSON/documentation.json
@@ -150,6 +150,7 @@
             "statements": []
           },
           "documentation": "Some comment on fn.",
+          "functionSelector": "a4a2c40b",
           "id": 14,
           "implemented": true,
           "kind": "function",
diff --git a/test/libsolidity/ASTJSON/documentation_legacy.json b/test/libsolidity/ASTJSON/documentation_legacy.json
index 37698f287..cd8012d9c 100644
--- a/test/libsolidity/ASTJSON/documentation_legacy.json
+++ b/test/libsolidity/ASTJSON/documentation_legacy.json
@@ -109,6 +109,7 @@
           "attributes":
           {
             "documentation": "Some comment on fn.",
+            "functionSelector": "a4a2c40b",
             "implemented": true,
             "isConstructor": false,
             "kind": "function",
diff --git a/test/libsolidity/ASTJSON/function_type.json b/test/libsolidity/ASTJSON/function_type.json
index e95857853..33ba4b22a 100644
--- a/test/libsolidity/ASTJSON/function_type.json
+++ b/test/libsolidity/ASTJSON/function_type.json
@@ -36,6 +36,7 @@
             "statements": []
           },
           "documentation": null,
+          "functionSelector": "d6cd4974",
           "id": 16,
           "implemented": true,
           "kind": "function",
diff --git a/test/libsolidity/ASTJSON/function_type_legacy.json b/test/libsolidity/ASTJSON/function_type_legacy.json
index 83249e1dd..8fa58f9c9 100644
--- a/test/libsolidity/ASTJSON/function_type_legacy.json
+++ b/test/libsolidity/ASTJSON/function_type_legacy.json
@@ -40,6 +40,7 @@
           "attributes":
           {
             "documentation": null,
+            "functionSelector": "d6cd4974",
             "implemented": true,
             "isConstructor": false,
             "kind": "function",
diff --git a/test/libsolidity/ASTJSON/long_type_name_binary_operation.json b/test/libsolidity/ASTJSON/long_type_name_binary_operation.json
index 1e9ac7166..e6d8b4d20 100644
--- a/test/libsolidity/ASTJSON/long_type_name_binary_operation.json
+++ b/test/libsolidity/ASTJSON/long_type_name_binary_operation.json
@@ -142,6 +142,7 @@
             ]
           },
           "documentation": null,
+          "functionSelector": "26121ff0",
           "id": 10,
           "implemented": true,
           "kind": "function",
diff --git a/test/libsolidity/ASTJSON/long_type_name_binary_operation_legacy.json b/test/libsolidity/ASTJSON/long_type_name_binary_operation_legacy.json
index 25f88d840..977f783dd 100644
--- a/test/libsolidity/ASTJSON/long_type_name_binary_operation_legacy.json
+++ b/test/libsolidity/ASTJSON/long_type_name_binary_operation_legacy.json
@@ -40,6 +40,7 @@
           "attributes":
           {
             "documentation": null,
+            "functionSelector": "26121ff0",
             "implemented": true,
             "isConstructor": false,
             "kind": "function",
diff --git a/test/libsolidity/ASTJSON/long_type_name_identifier.json b/test/libsolidity/ASTJSON/long_type_name_identifier.json
index 9e13dc887..5c8951d29 100644
--- a/test/libsolidity/ASTJSON/long_type_name_identifier.json
+++ b/test/libsolidity/ASTJSON/long_type_name_identifier.json
@@ -149,6 +149,7 @@
             ]
           },
           "documentation": null,
+          "functionSelector": "26121ff0",
           "id": 14,
           "implemented": true,
           "kind": "function",
diff --git a/test/libsolidity/ASTJSON/long_type_name_identifier_legacy.json b/test/libsolidity/ASTJSON/long_type_name_identifier_legacy.json
index ffcbd47a9..caf807c24 100644
--- a/test/libsolidity/ASTJSON/long_type_name_identifier_legacy.json
+++ b/test/libsolidity/ASTJSON/long_type_name_identifier_legacy.json
@@ -83,6 +83,7 @@
           "attributes":
           {
             "documentation": null,
+            "functionSelector": "26121ff0",
             "implemented": true,
             "isConstructor": false,
             "kind": "function",
diff --git a/test/libsolidity/ASTJSON/modifier_definition.json b/test/libsolidity/ASTJSON/modifier_definition.json
index 9b1a0ff98..19f7ed184 100644
--- a/test/libsolidity/ASTJSON/modifier_definition.json
+++ b/test/libsolidity/ASTJSON/modifier_definition.json
@@ -99,6 +99,7 @@
             "statements": []
           },
           "documentation": null,
+          "functionSelector": "28811f59",
           "id": 13,
           "implemented": true,
           "kind": "function",
diff --git a/test/libsolidity/ASTJSON/modifier_definition_legacy.json b/test/libsolidity/ASTJSON/modifier_definition_legacy.json
index 8d47ded4f..8f028a474 100644
--- a/test/libsolidity/ASTJSON/modifier_definition_legacy.json
+++ b/test/libsolidity/ASTJSON/modifier_definition_legacy.json
@@ -107,6 +107,7 @@
           "attributes":
           {
             "documentation": null,
+            "functionSelector": "28811f59",
             "implemented": true,
             "isConstructor": false,
             "kind": "function",
diff --git a/test/libsolidity/ASTJSON/modifier_invocation.json b/test/libsolidity/ASTJSON/modifier_invocation.json
index 9b1a0ff98..19f7ed184 100644
--- a/test/libsolidity/ASTJSON/modifier_invocation.json
+++ b/test/libsolidity/ASTJSON/modifier_invocation.json
@@ -99,6 +99,7 @@
             "statements": []
           },
           "documentation": null,
+          "functionSelector": "28811f59",
           "id": 13,
           "implemented": true,
           "kind": "function",
diff --git a/test/libsolidity/ASTJSON/modifier_invocation_legacy.json b/test/libsolidity/ASTJSON/modifier_invocation_legacy.json
index 8d47ded4f..8f028a474 100644
--- a/test/libsolidity/ASTJSON/modifier_invocation_legacy.json
+++ b/test/libsolidity/ASTJSON/modifier_invocation_legacy.json
@@ -107,6 +107,7 @@
           "attributes":
           {
             "documentation": null,
+            "functionSelector": "28811f59",
             "implemented": true,
             "isConstructor": false,
             "kind": "function",
diff --git a/test/libsolidity/ASTJSON/non_utf8.json b/test/libsolidity/ASTJSON/non_utf8.json
index 8c2a27e1a..18f6b12dc 100644
--- a/test/libsolidity/ASTJSON/non_utf8.json
+++ b/test/libsolidity/ASTJSON/non_utf8.json
@@ -89,6 +89,7 @@
             ]
           },
           "documentation": null,
+          "functionSelector": "26121ff0",
           "id": 7,
           "implemented": true,
           "kind": "function",
diff --git a/test/libsolidity/ASTJSON/non_utf8_legacy.json b/test/libsolidity/ASTJSON/non_utf8_legacy.json
index 5c0260cf2..9f7933020 100644
--- a/test/libsolidity/ASTJSON/non_utf8_legacy.json
+++ b/test/libsolidity/ASTJSON/non_utf8_legacy.json
@@ -40,6 +40,7 @@
           "attributes":
           {
             "documentation": null,
+            "functionSelector": "26121ff0",
             "implemented": true,
             "isConstructor": false,
             "kind": "function",
diff --git a/test/libsolidity/ASTJSON/override.json b/test/libsolidity/ASTJSON/override.json
index a80070ad7..cb3d0268b 100644
--- a/test/libsolidity/ASTJSON/override.json
+++ b/test/libsolidity/ASTJSON/override.json
@@ -44,6 +44,7 @@
             "statements": []
           },
           "documentation": null,
+          "functionSelector": "a399b6a2",
           "id": 4,
           "implemented": true,
           "kind": "function",
@@ -120,6 +121,7 @@
         {
           "body": null,
           "documentation": null,
+          "functionSelector": "c2985578",
           "id": 10,
           "implemented": false,
           "kind": "function",
@@ -160,6 +162,7 @@
             "statements": []
           },
           "documentation": null,
+          "functionSelector": "a399b6a2",
           "id": 15,
           "implemented": true,
           "kind": "function",
@@ -254,6 +257,7 @@
             "statements": []
           },
           "documentation": null,
+          "functionSelector": "c2985578",
           "id": 23,
           "implemented": true,
           "kind": "function",
@@ -300,6 +304,7 @@
             "statements": []
           },
           "documentation": null,
+          "functionSelector": "a399b6a2",
           "id": 30,
           "implemented": true,
           "kind": "function",
diff --git a/test/libsolidity/ASTJSON/override_legacy.json b/test/libsolidity/ASTJSON/override_legacy.json
index 5a594d9f8..a9bece4ac 100644
--- a/test/libsolidity/ASTJSON/override_legacy.json
+++ b/test/libsolidity/ASTJSON/override_legacy.json
@@ -48,6 +48,7 @@
           "attributes":
           {
             "documentation": null,
+            "functionSelector": "a399b6a2",
             "implemented": true,
             "isConstructor": false,
             "kind": "function",
@@ -163,6 +164,7 @@
           {
             "body": null,
             "documentation": null,
+            "functionSelector": "c2985578",
             "implemented": false,
             "isConstructor": false,
             "kind": "function",
@@ -218,6 +220,7 @@
               4
             ],
             "documentation": null,
+            "functionSelector": "a399b6a2",
             "implemented": true,
             "isConstructor": false,
             "kind": "function",
@@ -349,6 +352,7 @@
               10
             ],
             "documentation": null,
+            "functionSelector": "c2985578",
             "implemented": true,
             "isConstructor": false,
             "kind": "function",
@@ -428,6 +432,7 @@
               15
             ],
             "documentation": null,
+            "functionSelector": "a399b6a2",
             "implemented": true,
             "isConstructor": false,
             "kind": "function",
diff --git a/test/libsolidity/ASTJSON/short_type_name.json b/test/libsolidity/ASTJSON/short_type_name.json
index a21e2d8d7..887f29a1d 100644
--- a/test/libsolidity/ASTJSON/short_type_name.json
+++ b/test/libsolidity/ASTJSON/short_type_name.json
@@ -93,6 +93,7 @@
             ]
           },
           "documentation": null,
+          "functionSelector": "26121ff0",
           "id": 10,
           "implemented": true,
           "kind": "function",
diff --git a/test/libsolidity/ASTJSON/short_type_name_legacy.json b/test/libsolidity/ASTJSON/short_type_name_legacy.json
index 99d2f3eee..4d1de106b 100644
--- a/test/libsolidity/ASTJSON/short_type_name_legacy.json
+++ b/test/libsolidity/ASTJSON/short_type_name_legacy.json
@@ -40,6 +40,7 @@
           "attributes":
           {
             "documentation": null,
+            "functionSelector": "26121ff0",
             "implemented": true,
             "isConstructor": false,
             "kind": "function",
diff --git a/test/libsolidity/ASTJSON/short_type_name_ref.json b/test/libsolidity/ASTJSON/short_type_name_ref.json
index a53ec783d..0aa3d2984 100644
--- a/test/libsolidity/ASTJSON/short_type_name_ref.json
+++ b/test/libsolidity/ASTJSON/short_type_name_ref.json
@@ -105,6 +105,7 @@
             ]
           },
           "documentation": null,
+          "functionSelector": "26121ff0",
           "id": 11,
           "implemented": true,
           "kind": "function",
diff --git a/test/libsolidity/ASTJSON/short_type_name_ref_legacy.json b/test/libsolidity/ASTJSON/short_type_name_ref_legacy.json
index 6811d0014..4eec368b6 100644
--- a/test/libsolidity/ASTJSON/short_type_name_ref_legacy.json
+++ b/test/libsolidity/ASTJSON/short_type_name_ref_legacy.json
@@ -40,6 +40,7 @@
           "attributes":
           {
             "documentation": null,
+            "functionSelector": "26121ff0",
             "implemented": true,
             "isConstructor": false,
             "kind": "function",
diff --git a/test/libsolidity/ASTJSON/source_location.json b/test/libsolidity/ASTJSON/source_location.json
index 6b32a51cf..cc6dd33c9 100644
--- a/test/libsolidity/ASTJSON/source_location.json
+++ b/test/libsolidity/ASTJSON/source_location.json
@@ -127,6 +127,7 @@
             ]
           },
           "documentation": null,
+          "functionSelector": "26121ff0",
           "id": 10,
           "implemented": true,
           "kind": "function",
diff --git a/test/libsolidity/ASTJSON/source_location_legacy.json b/test/libsolidity/ASTJSON/source_location_legacy.json
index 36b939504..dfde18975 100644
--- a/test/libsolidity/ASTJSON/source_location_legacy.json
+++ b/test/libsolidity/ASTJSON/source_location_legacy.json
@@ -40,6 +40,7 @@
           "attributes":
           {
             "documentation": null,
+            "functionSelector": "26121ff0",
             "implemented": true,
             "isConstructor": false,
             "kind": "function",
diff --git a/test/libsolidity/ASTJSON/two_base_functions.json b/test/libsolidity/ASTJSON/two_base_functions.json
index 95a4cb142..7e6e15395 100644
--- a/test/libsolidity/ASTJSON/two_base_functions.json
+++ b/test/libsolidity/ASTJSON/two_base_functions.json
@@ -44,6 +44,7 @@
             "statements": []
           },
           "documentation": null,
+          "functionSelector": "26121ff0",
           "id": 4,
           "implemented": true,
           "kind": "function",
@@ -100,6 +101,7 @@
             "statements": []
           },
           "documentation": null,
+          "functionSelector": "26121ff0",
           "id": 9,
           "implemented": true,
           "kind": "function",
@@ -209,6 +211,7 @@
             "statements": []
           },
           "documentation": null,
+          "functionSelector": "26121ff0",
           "id": 21,
           "implemented": true,
           "kind": "function",
diff --git a/test/libsolidity/ASTJSON/two_base_functions_legacy.json b/test/libsolidity/ASTJSON/two_base_functions_legacy.json
index f12a8b995..bc9e4545c 100644
--- a/test/libsolidity/ASTJSON/two_base_functions_legacy.json
+++ b/test/libsolidity/ASTJSON/two_base_functions_legacy.json
@@ -48,6 +48,7 @@
           "attributes":
           {
             "documentation": null,
+            "functionSelector": "26121ff0",
             "implemented": true,
             "isConstructor": false,
             "kind": "function",
@@ -141,6 +142,7 @@
           "attributes":
           {
             "documentation": null,
+            "functionSelector": "26121ff0",
             "implemented": true,
             "isConstructor": false,
             "kind": "function",
@@ -286,6 +288,7 @@
               9
             ],
             "documentation": null,
+            "functionSelector": "26121ff0",
             "implemented": true,
             "isConstructor": false,
             "kind": "function",