WIP: rewrite C++ backend to be CHEADmaster

+ C allows for a bit more control, and we can manually handle closure
  contexts. For example `examples/fib.fwd` now works for effectively any
  `n`, pretty cool.

+ Fairly slow Fibonacci, I must admit. Initial profiling indicates it's
  mainly due to branch mispredictions, but I'll have to look into this a
  bit deeper.

+ The code is a bit hacked together, for now I'm more interested in
  getting things working, I'll worry about making things pretty later.

+ For testing, there's also initial support for modules, just so I can
  print stuff to the terminal

+ This commit is way too big, lol

1 files changed, 23 insertions, 0 deletions

diff --git a/examples/sum.fwd b/examples/sum.fwd
new file mode 100644
index 0000000..89a2d11
--- /dev/null
+++ b/examples/sum.fwd
@@ -0,0 +1,23 @@
+print_int(i64 a);
+print_nl();
+
+sum_inner(i64 s, i64 n, (i64) res)
+{
+	if n <= 0 {
+		res(s);
+	} else {
+		sum_inner(s + n, n - 1, res);
+	}
+}
+
+sum(i64 n, (i64) res)
+{
+	sum_inner(0, n, res);
+}
+
+main()
+{
+	sum(1000000000) => i64 s;
+	print_int(s);
+	print_nl();
+}