Add solidity generator

Co-authored-by: Kamil Śliwak <kamil.sliwak@codepoets.it>

test/tools/ossfuzz/SolidityCustomMutatorInterface.h

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+/*
+	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
+/**
+ * Implements libFuzzer's custom mutator interface.
+ */
+
+#pragma once
+
+#include <test/tools/ossfuzz/SolidityGenerator.h>
+
+#include <memory>
+
+namespace solidity::test::fuzzer
+{
+struct SolidityCustomMutatorInterface
+{
+	SolidityCustomMutatorInterface(uint8_t* _data, size_t _size, size_t _maxSize, unsigned _seed);
+	/// Generates Solidity test program, copies it into buffer
+	/// provided by libFuzzer and @returns size of the test program.
+	size_t generate();
+
+	/// Raw pointer to libFuzzer provided input
+	uint8_t* data;
+	/// Size of libFuzzer provided input
+	size_t size;
+	/// Maximum length of mutant specified by libFuzzer
+	size_t maxMutantSize;
+	/// Solidity generator handle
+	std::shared_ptr<SolidityGenerator> generator;
+};
+}