Function reference resolver.

libyul/FunctionReferenceResolver.cpp

@@ -0,0 +1,60 @@
+/*
+	This file is part of solidity.
+
+	solidity is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	solidity is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
+*/
+// SPDX-License-Identifier: GPL-3.0
+
+#include <libyul/FunctionReferenceResolver.h>
+
+#include <libyul/AST.h>
+#include <libsolutil/CommonData.h>
+
+#include <range/v3/view/reverse.hpp>
+
+using namespace std;
+using namespace solidity::yul;
+using namespace solidity::util;
+
+FunctionReferenceResolver::FunctionReferenceResolver(Block const& _ast)
+{
+	(*this)(_ast);
+	yulAssert(m_scopes.empty());
+}
+
+void FunctionReferenceResolver::operator()(FunctionCall const& _functionCall)
+{
+	for (auto&& scope: m_scopes | ranges::views::reverse)
+		if (FunctionDefinition const** function = util::valueOrNullptr(scope, _functionCall.functionName.name))
+		{
+			m_functionReferences[&_functionCall] = *function;
+			break;
+		}
+
+	// If we did not find anything, it was a builtin call.
+
+	ASTWalker::operator()(_functionCall);
+}
+
+void FunctionReferenceResolver::operator()(Block const& _block)
+{
+	m_scopes.emplace_back();
+	for (auto const& statement: _block.statements)
+		if (auto const* function = get_if<FunctionDefinition>(&statement))
+			m_scopes.back()[function->name] = function;
+
+	ASTWalker::operator()(_block);
+
+	m_scopes.pop_back();
+}