feat: Start on x86-64 JIT backend

This change adds the fundamentals for a x86-64 JIT backend which
translates the Brainfuck instruction list onto x86-64 instructions.

See #61

CMakeLists.txt

@@ -13,7 +13,7 @@ option(ENABLE_EDITLINE "Enable GNU readline functionality provided by the editli
 
 include_directories(include/)
 add_definitions("-Wall -Wextra -O2 -std=c89")
-add_executable(brainfuck src/main.c src/brainfuck.c)
+add_executable(brainfuck include/brainfuck.h include/jit.h src/main.c src/brainfuck.c src/jit/x86_64.c)
 install(TARGETS brainfuck RUNTIME DESTINATION bin)
 install(FILES include/brainfuck.h DESTINATION "include")
 install(FILES man/brainfuck.1 DESTINATION "share/man/man1")

include/jit.h

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2016 Fabian Mastenbroek
+ *
+ * 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
+ *
+ *     http://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.
+ */
+#ifndef JIT_H
+#define JIT_H
+
+#define BRAINFUCK_EUNAVAILABLE 2 /**< Feature not implemented or unavailable */
+
+/**
+ * Execute the given list of instructions using a Just-in-Time compiler.
+ *
+ * @param root The first in the list of instructions.
+ * @param context The context within the execution takes place.
+ * @return A negative non-zero integer to indicate a failure, zero on success.
+ */
+int brainfuck_execute_jit(struct BrainfuckInstruction *,
+						  struct BrainfuckExecutionContext *);
+
+#endif /* JIT_H */

src/jit/stub.c

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2016 Fabian Mastenbroek
+ *
+ * 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
+ *
+ *     http://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.
+ */
+
+#include <jit.h>
+
+/**
+ * Execute the given list of instructions using a Just-in-Time compiler.
+ *
+ * @param root The first in the list of instructions.
+ * @param context The context within the execution takes place.
+ * @return A negative non-zero integer to indicate a failure, zero on success.
+ */
+int brainfuck_execute_jit(BrainfuckInstruction *root,
+                          BrainfuckExecutionContext *context)
+{
+    return BRAINFUCK_EUNAVAILABLE;
+}