Get basic G-machine compilation working.

src/gmachine.cpp

@@ -0,0 +1,89 @@
+#include "gmachine.hpp"
+#include <iostream>
+
+namespace lily {
+    std::ostream& operator<<(std::ostream& os, instruction& inst) {
+        inst.to_stream(os);
+        return os;
+    }
+
+    std::ostream& instruction_slide::to_stream(std::ostream& os) {
+        os << "slide(" << amount << ")";
+        return os;
+    }
+
+    std::ostream& instruction_alloc::to_stream(std::ostream& os) {
+        os << "alloc(" << amount << ")";
+        return os;
+    }
+
+    std::ostream& instruction_pop::to_stream(std::ostream& os) {
+        os << "pop(" << amount << ")";
+        return os;
+    }
+
+    std::ostream& instruction_unwind::to_stream(std::ostream& os) {
+        os << "unwind";
+        return os;
+    }
+
+    std::ostream& instruction_push_global::to_stream(std::ostream& os) {
+        os << "pushglobal(" << name << ")";
+        return os;
+    }
+
+    std::ostream& instruction_push_int::to_stream(std::ostream& os) {
+        os << "pushint(" << value << ")";
+        return os;
+    }
+
+    std::ostream& instruction_push_str::to_stream(std::ostream& os) {
+        os << "pushstr(" << str << ")";
+        return os;
+    }
+
+    std::ostream& instruction_push::to_stream(std::ostream& os) {
+        os << "push(" << offset << ")";
+        return os;
+    }
+
+    std::ostream& instruction_mkapp::to_stream(std::ostream& os) {
+        os << "mkapp";
+        return os;
+    }
+
+    std::ostream& instruction_eval::to_stream(std::ostream& os) {
+        os << "eval";
+        return os;
+    }
+
+    std::ostream& instruction_op::to_stream(std::ostream& os) {
+        os << "op(" << op_supercombinator(op) << ")";
+        return os;
+    }
+
+    std::ostream& instruction_cond::to_stream(std::ostream& os) {
+        os << "cond";
+        return os;
+    }
+
+    std::ostream& instruction_update::to_stream(std::ostream& os) {
+        os << "update(" << offset << ")";
+        return os;
+    }
+
+    std::ostream& instruction_pack::to_stream(std::ostream& os) {
+        os << "pack(" << constructor << ", " << arity << ")";
+        return os;
+    }
+
+    std::ostream& instruction_split::to_stream(std::ostream& os) {
+        os << "split(" << arity << ")";
+        return os;
+    }
+
+    std::ostream& instruction_jump::to_stream(std::ostream& os) {
+        os << "jump";
+        return os;
+    }
+}