[Yul] Implements a pass to rewrite for-loop's pre block into the parent's Block.

1 files changed, 39 insertions, 0 deletions

diff --git a/libyul/optimiser/ForLoopInitRewriter.h b/libyul/optimiser/ForLoopInitRewriter.h
new file mode 100644
index 00000000..64f53711
--- /dev/null
+++ b/libyul/optimiser/ForLoopInitRewriter.h
@@ -0,0 +1,39 @@
+/*
+	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/>.
+*/
+#pragma once
+
+#include <libyul/optimiser/ASTWalker.h>
+
+namespace dev
+{
+namespace yul
+{
+
+/**
+ * Rewrites ForLoop by moving the pre statement block in front of the ForLoop.
+ * Requirements:
+ * - The Disambiguator must be run upfront.
+ */
+class ForLoopInitRewriter: public ASTModifier
+{
+public:
+	using ASTModifier::operator();
+	void operator()(Block& _block) override;
+};
+
+}
+}