reorganize the directories under src, and rescue the JavaScript interpreter from deprecated

src/runtime/c/gfcc-tree.h

@@ -0,0 +1,49 @@
+#ifndef GFCC_TREE_H
+#define GFCC_TREE_H
+
+typedef enum {
+	ATOM_STRING,
+	ATOM_INTEGER,
+	ATOM_DOUBLE,
+	ATOM_META,
+	ATOM_FIRST_FUN
+} atom_type;
+
+struct Tree_{
+	atom_type type;
+	union {
+		const char *string_value;
+		int integer_value;
+		double double_value;
+		int size;
+	} value;
+	struct Tree_ *args[0];
+};
+
+typedef struct Tree_ Tree;
+
+static inline Tree *tree_get_child(Tree *t, int n) {
+	return t->args[n];
+}
+
+static inline void tree_set_child(Tree *t, int n, Tree *a) {
+	t->args[n] = a;
+}
+
+extern int arity(Tree *t);
+
+
+extern Tree *tree_string(const char *s);
+
+extern Tree *tree_integer(int i);
+
+extern Tree *tree_double(double d);
+
+extern Tree *tree_meta();
+
+extern Tree *tree_fun(atom_type f, int n);
+
+
+extern void tree_free(Tree *t);
+
+#endif