Sync upstream to r102410.

Re-turn on sdk.

Change-Id: I91a890863989a67243b4d2dfd1ae09b843ebaeaf

1 files changed, 36 insertions, 0 deletions

diff --git a/examples/OCaml-Kaleidoscope/Chapter6/ast.ml b/examples/OCaml-Kaleidoscope/Chapter6/ast.ml
new file mode 100644
index 0000000..99088cf
--- /dev/null
+++ b/examples/OCaml-Kaleidoscope/Chapter6/ast.ml
@@ -0,0 +1,36 @@
+(*===----------------------------------------------------------------------===
+ * Abstract Syntax Tree (aka Parse Tree)
+ *===----------------------------------------------------------------------===*)
+
+(* expr - Base type for all expression nodes. *)
+type expr =
+  (* variant for numeric literals like "1.0". *)
+  | Number of float
+
+  (* variant for referencing a variable, like "a". *)
+  | Variable of string
+
+  (* variant for a unary operator. *)
+  | Unary of char * expr
+
+  (* variant for a binary operator. *)
+  | Binary of char * expr * expr
+
+  (* variant for function calls. *)
+  | Call of string * expr array
+
+  (* variant for if/then/else. *)
+  | If of expr * expr * expr
+
+  (* variant for for/in. *)
+  | For of string * expr * expr * expr option * expr
+
+(* proto - This type represents the "prototype" for a function, which captures
+ * its name, and its argument names (thus implicitly the number of arguments the
+ * function takes). *)
+type proto =
+  | Prototype of string * string array
+  | BinOpPrototype of string * string array * int
+
+(* func - This type represents a function definition itself. *)
+type func = Function of proto * expr