Annotate function ID of functions that may be called via the internal dispatch.

Co-authored-by: Daniel <daniel@ekpyron.org>

Changelog.md

@@ -12,6 +12,10 @@ Compiler Features:
 Bugfixes:
 
 
+AST Changes:
+ * AST: add the ``internalFunctionID`` field to the AST nodes of functions that may be called via the internal dispatch. These IDs are always generated, but they are only used in via-IR code generation.
+
+
 ### 0.8.19 (2023-02-22)
 
 Language Features:

libsolidity/ast/ASTAnnotations.h

@@ -178,6 +178,7 @@ struct CallableDeclarationAnnotation: DeclarationAnnotation
 
 struct FunctionDefinitionAnnotation: CallableDeclarationAnnotation, StructurallyDocumentedAnnotation
 {
+	util::SetOnce<uint64_t> internalFunctionID;
 };
 
 struct EventDefinitionAnnotation: CallableDeclarationAnnotation, StructurallyDocumentedAnnotation

libsolidity/ast/ASTJsonExporter.cpp

@@ -468,6 +468,10 @@ bool ASTJsonExporter::visit(FunctionDefinition const& _node)
 		attributes.emplace_back("functionSelector", _node.externalIdentifierHex());
 	if (!_node.annotation().baseFunctions.empty())
 		attributes.emplace_back(make_pair("baseFunctions", getContainerIds(_node.annotation().baseFunctions, true)));
+
+	if (_node.annotation().internalFunctionID.set())
+		attributes.emplace_back("internalFunctionID", *_node.annotation().internalFunctionID);
+
 	setJsonNode(_node, "FunctionDefinition", std::move(attributes));
 	return false;
 }

libsolidity/codegen/ir/IRGenerationContext.cpp

@@ -177,17 +177,3 @@ ABIFunctions IRGenerationContext::abiFunctions()
 {
 	return ABIFunctions(m_evmVersion, m_revertStrings, m_functions);
 }
-
-uint64_t IRGenerationContext::internalFunctionID(FunctionDefinition const& _function, bool _requirePresent)
-{
-	auto [iterator, inserted] = m_functionIDs.try_emplace(_function.id(), m_functionIDs.size() + 1);
-	if (_requirePresent)
-			solAssert(!inserted, "");
-	return iterator->second;
-}
-
-void IRGenerationContext::copyFunctionIDsFrom(IRGenerationContext const& _other)
-{
-	solAssert(m_functionIDs.empty(), "");
-	m_functionIDs = _other.m_functionIDs;
-}

libsolidity/codegen/ir/IRGenerationContext.h

@@ -163,14 +163,6 @@ public:
 	bool memoryUnsafeInlineAssemblySeen() const { return m_memoryUnsafeInlineAssemblySeen; }
 	void setMemoryUnsafeInlineAssemblySeen() { m_memoryUnsafeInlineAssemblySeen = true; }
 
-	/// @returns the runtime ID to be used for the function in the dispatch routine
-	/// and for internal function pointers.
-	/// @param _requirePresent if false, generates a new ID if not yet done.
-	uint64_t internalFunctionID(FunctionDefinition const& _function, bool _requirePresent);
-	/// Copies the internal function IDs from the @a _other. For use in transferring
-	/// function IDs from constructor code to deployed code.
-	void copyFunctionIDsFrom(IRGenerationContext const& _other);
-
 	std::map<std::string, unsigned> const& sourceIndices() const { return m_sourceIndices; }
 	void markSourceUsed(std::string const& _name) { m_usedSourceNames.insert(_name); }
 	std::set<std::string> const& usedSourceNames() const { return m_usedSourceNames; }
@@ -219,8 +211,6 @@ private:
 	/// the code contains a call via a pointer even though a specific function is never assigned to it.
 	/// It will fail at runtime but the code must still compile.
 	InternalDispatchMap m_internalDispatchMap;
-	/// Map used by @a internalFunctionID.
-	std::map<int64_t, uint64_t> m_functionIDs;
 
 	std::set<ContractDefinition const*, ASTNode::CompareByID> m_subObjects;
 

libsolidity/codegen/ir/IRGenerator.cpp

@@ -313,7 +313,7 @@ InternalDispatchMap IRGenerator::generateInternalDispatchFunctions(ContractDefin
 				solAssert(m_context.functionCollector().contains(IRNames::function(*function)), "");
 
 				cases.emplace_back(map<string, string>{
-					{"funID", to_string(m_context.internalFunctionID(*function, true))},
+					{"funID", to_string(*function->annotation().internalFunctionID)},
 					{"name", IRNames::function(*function)}
 				});
 			}
@@ -1117,7 +1117,6 @@ void IRGenerator::resetContext(ContractDefinition const& _contract, ExecutionCon
 		m_context.debugInfoSelection(),
 		m_context.soliditySourceProvider()
 	);
-	newContext.copyFunctionIDsFrom(m_context);
 	m_context = std::move(newContext);
 
 	m_context.setMostDerivedContract(_contract);

libsolidity/codegen/ir/IRGeneratorForStatements.cpp

@@ -2807,7 +2807,7 @@ void IRGeneratorForStatements::assignInternalFunctionIDIfNotCalledDirectly(
 		return;
 
 	define(IRVariable(_expression).part("functionIdentifier")) <<
-		to_string(m_context.internalFunctionID(_referencedFunction, false)) <<
+		to_string(*_referencedFunction.annotation().internalFunctionID) <<
 		"\n";
 	m_context.addToInternalDispatch(_referencedFunction);
 }

libsolidity/interface/CompilerStack.cpp

@@ -526,6 +526,7 @@ bool CompilerStack::analyze()
 		if (noErrors)
 		{
 			createAndAssignCallGraphs();
+			annotateInternalFunctionIDs();
 			findAndReportCyclicContractDependencies();
 		}
 
@@ -1245,6 +1246,34 @@ void CompilerStack::storeContractDefinitions()
 			}
 }
 
+void CompilerStack::annotateInternalFunctionIDs()
+{
+	uint64_t internalFunctionID = 1;
+	for (Source const* source: m_sourceOrder)
+	{
+		if (!source->ast)
+			continue;
+
+		for (ContractDefinition const* contract: ASTNode::filteredNodes<ContractDefinition>(source->ast->nodes()))
+		{
+			ContractDefinitionAnnotation& annotation = contract->annotation();
+
+			if (auto const* deployTimeInternalDispatch = util::valueOrNullptr((*annotation.deployedCallGraph)->edges, CallGraph::SpecialNode::InternalDispatch))
+				for (auto const& node: *deployTimeInternalDispatch)
+					if (auto const* callable = get_if<CallableDeclaration const*>(&node))
+						if (auto const* function = dynamic_cast<FunctionDefinition const*>(*callable))
+							if (!function->annotation().internalFunctionID.set())
+								function->annotation().internalFunctionID = internalFunctionID++;
+			if (auto const* creationTimeInternalDispatch = util::valueOrNullptr((*annotation.creationCallGraph)->edges, CallGraph::SpecialNode::InternalDispatch))
+				for (auto const& node: *creationTimeInternalDispatch)
+					if (auto const* callable = get_if<CallableDeclaration const*>(&node))
+						if (auto const* function = dynamic_cast<FunctionDefinition const*>(*callable))
+							// Make sure the function already got an ID since it also occurs in the deploy-time internal dispatch.
+							solAssert(function->annotation().internalFunctionID.set());
+		}
+	}
+}
+
 namespace
 {
 bool onlySafeExperimentalFeaturesActivated(set<ExperimentalFeature> const& features)

libsolidity/interface/CompilerStack.h

@@ -415,6 +415,9 @@ private:
 	/// Store the contract definitions in m_contracts.
 	void storeContractDefinitions();
 
+	/// Annotate internal dispatch function Ids
+	void annotateInternalFunctionIDs();
+
 	/// @returns true if the source is requested to be compiled.
 	bool isRequestedSource(std::string const& _sourceName) const;
 

test/libsolidity/ASTJSON/ast_internal_function_id_export.sol

@@ -0,0 +1,48 @@
+function free1() {}
+function free2() {}
+function free3() {}
+library L {
+    function ext() external {}
+    function inr1() internal {}
+    function inr2() internal {}
+    function inr3() internal {}
+    function access() public {
+        free1;
+        inr1;
+        L.ext;
+    }
+    function expression() public {
+        (free2)();
+        (inr2)();
+    }
+}
+contract C {
+    function ext1() external {}
+    function ext2() external {}
+    function ext3() external {}
+    function inr1() internal {}
+    function inr2() internal {}
+    function inr3() internal {}
+    function access() public {
+        this.ext1;
+        inr1;
+        free1;
+        L.inr1;
+        L.ext;
+    }
+    function expression() public {
+        (this.ext2)();
+        (inr2)();
+        (free2)();
+        (L.inr2)();
+        (L.ext)();
+    }
+}
+contract D is C {
+    constructor() {
+        access();
+        expression();
+    }
+}
+
+// ----