Merge pull request #5587 from ethereum/yulCodeBuiltins

Builtin functions to access Yul objects.

1 files changed, 76 insertions, 0 deletions

diff --git a/libyul/Dialect.cpp b/libyul/Dialect.cpp
new file mode 100644
index 00000000..99718787
--- /dev/null
+++ b/libyul/Dialect.cpp
@@ -0,0 +1,76 @@
+/*
+	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/>.
+*/
+/**
+ * Yul dialect.
+ */
+
+#include <libyul/Dialect.h>
+
+#include <map>
+
+using namespace yul;
+using namespace std;
+
+namespace
+{
+
+void addFunction(
+	map<YulString, BuiltinFunction>& _repository,
+	string const& _name,
+	size_t _params,
+	size_t _returns,
+	bool _movable
+)
+{
+	_repository[YulString{_name}] = BuiltinFunction{
+		YulString{_name},
+		vector<Type>(_params),
+		vector<Type>(_returns),
+		_movable
+	};
+}
+
+class GenericBuiltins: public Builtins
+{
+public:
+	GenericBuiltins(map<YulString, BuiltinFunction> const& _functions): m_functions(_functions) {}
+	BuiltinFunction const* query(YulString _name) const
+	{
+		auto it = m_functions.find(_name);
+		if (it != end(m_functions))
+			return &it->second;
+		else
+			return nullptr;
+	}
+private:
+	map<YulString, BuiltinFunction> const& m_functions;
+};
+
+}
+
+Dialect Dialect::strictAssemblyForEVMObjects()
+{
+	static map<YulString, BuiltinFunction> functions;
+	if (functions.empty())
+	{
+		addFunction(functions, "datasize", 1, 1, true);
+		addFunction(functions, "dataoffset", 1, 1, true);
+		addFunction(functions, "datacopy", 3, 0, false);
+	}
+	// The EVM instructions will be moved to builtins at some point.
+	return Dialect{AsmFlavour::Strict, std::make_shared<GenericBuiltins>(functions)};
+}