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+// Copyright 2021 Benjamin Barenblat
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License. You may obtain a copy of
+// the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations under
+// the License.
+
+// Built-in functions.
+
+#ifndef EC_SRC_BUILTIN_H_
+#define EC_SRC_BUILTIN_H_
+
+#include <memory>
+#include <string>
+
+#include "src/language.h"
+#include "third_party/abseil/absl/container/flat_hash_map.h"
+
+namespace ec {
+
+// The initial environment.
+absl::flat_hash_map<std::string, std::shared_ptr<const Term>>
+BuiltinEnvironment() noexcept;
+
+// Stack operations.
+void BuiltinDup(State&);
+void BuiltinDrop(State&);
+void BuiltinSwap(State&);
+
+// Basic unary operations.
+void BuiltinNeg(State&);
+void BuiltinInv(State&);
+void BuiltinSq(State&);
+void BuiltinSqrt(State&);
+void BuiltinAlog(State&);
+void BuiltinLog(State&);
+void BuiltinExp(State&);
+void BuiltinLn(State&);
+void BuiltinSin(State&);
+void BuiltinCos(State&);
+void BuiltinTan(State&);
+void BuiltinAsin(State&);
+void BuiltinAcos(State&);
+void BuiltinAtan(State&);
+void BuiltinAbs(State&);
+
+// Basic binary operations.
+void BuiltinAdd(State&);
+void BuiltinSub(State&);
+void BuiltinMul(State&);
+void BuiltinDiv(State&);
+void BuiltinPow(State&);
+void BuiltinXroot(State&);
+
+}  // namespace ec
+
+#endif  // EC_SRC_BUILTIN_H_