core: Add initial codegen sources

Signed-off-by: Ian Moffett <ian@mirocom.org>

core/codegen.c

@@ -0,0 +1,42 @@
+#include <stdint.h>
+#include <stddef.h>
+#include "rifle/codegen.h"
+#include "rifle/trace.h"
+#include "rifle/mu.h"
+
+static int
+resolve_func(struct rifle_state *state, struct ast_node *root)
+{
+    struct symbol *symbol;
+
+    if (state == NULL || root == NULL) {
+        return -1;
+    }
+
+    if ((symbol = root->symbol) == NULL) {
+        trace_error(state, "internal: no symbol associated with func node\n");
+        return -1;
+    }
+
+    return mu_gen_label(state, symbol->name);
+}
+
+int
+cg_resolve_node(struct rifle_state *state, struct ast_node *root)
+{
+    if (state == NULL || root == NULL) {
+        return -1;
+    }
+
+    switch (root->type) {
+    case AST_FUNC:
+        if (resolve_func(state, root) < 0) {
+            return -1;
+        }
+
+        break;
+    default:
+        trace_error(state, "unknown ast node %d\n", root->type);
+        break;
+    }
+}