From: Siraaj Khandkar <siraaj@khandkar.net>
Date: Tue, 18 Sep 2018 20:55:25 +0000 (-0400)
Subject: Fix Symbol.new_of_string - it should not save
X-Git-Url: https://git.xandkar.net/?p=tiger.ml.git;a=commitdiff_plain;h=fd2204fa98928a900f303209818dce7f2bae3c8a

Fix Symbol.new_of_string - it should not save

also rename it to unique_of_string to clarify the main idea
---

diff --git a/compiler/src/lib/tiger/tiger_env.ml b/compiler/src/lib/tiger/tiger_env.ml
index 1e4cd1d..504e9bd 100644
--- a/compiler/src/lib/tiger/tiger_env.ml
+++ b/compiler/src/lib/tiger/tiger_env.ml
@@ -28,7 +28,7 @@ let set_val t k v =
   {t with vals = Map.set t.vals ~k ~v}
 
 let loop_begin t =
-  let loop = Sym.new_of_string "loop" in
+  let loop = Sym.unique_of_string "loop" in
   let t = {t with loop = Some loop} in
   (loop, t)
 
diff --git a/compiler/src/lib/tiger/tiger_symbol.ml b/compiler/src/lib/tiger/tiger_symbol.ml
index b5d895b..747cb03 100644
--- a/compiler/src/lib/tiger/tiger_symbol.ml
+++ b/compiler/src/lib/tiger/tiger_symbol.ml
@@ -9,20 +9,19 @@ let counter = ref 0
 
 let symbols = H.create 16
 
-let next name =
+let unique_of_string name =
   incr counter;
   let symbol = !counter in
   {name; symbol}
 
-let new_of_string name =
-  let t = next name in
-  H.replace symbols ~key:t.name ~data:t.symbol;
-  t
-
 let of_string name =
   match H.find_opt symbols name with
-  | Some s -> {name; symbol=s}
-  | None   -> new_of_string name
+  | Some symbol ->
+      {name; symbol}
+  | None ->
+      let t = unique_of_string name in
+      H.replace symbols ~key:t.name ~data:t.symbol;
+      t
 
 let to_string {name; _} =
   name
diff --git a/compiler/src/lib/tiger/tiger_symbol.mli b/compiler/src/lib/tiger/tiger_symbol.mli
index 1dd5acc..8b3f8ec 100644
--- a/compiler/src/lib/tiger/tiger_symbol.mli
+++ b/compiler/src/lib/tiger/tiger_symbol.mli
@@ -1,6 +1,6 @@
 type t
 
-val new_of_string : string -> t
+val unique_of_string : string -> t
 
 val of_string : string -> t