Use LLVM to JIT the code for one of the drawer functions

src/r_compiler/ssa/ssa_function.h

@@ -0,0 +1,30 @@
+
+#pragma once
+
+#include <string>
+#include <vector>
+
+namespace llvm { class Value; }
+namespace llvm { class Type; }
+namespace llvm { class Function; }
+
+class SSAInt;
+class SSAValue;
+
+class SSAFunction
+{
+public:
+	SSAFunction(const std::string name);
+	void set_return_type(llvm::Type *type);
+	void add_parameter(llvm::Type *type);
+	void create_public();
+	void create_private();
+	SSAValue parameter(int index);
+
+	llvm::Function *func;
+
+private:
+	std::string name;
+	llvm::Type *return_type;
+	std::vector<llvm::Type *> parameters;
+};