Add documentation and fix makefile for Compcert

1 files changed, 43 insertions, 36 deletions

diff --git a/src/common/Show.v b/src/common/Show.v
index 8f9ec36..c994df3 100644
--- a/src/common/Show.v
+++ b/src/common/Show.v
@@ -19,43 +19,50 @@
 From Coq Require Import
     Strings.String
     Bool.Bool
-    Arith.Arith.
+    Arith.Arith
+    ZArith.ZArith.
 
 Local Open Scope string.
 
-Module Show.
-  Class Show A : Type :=
-    {
-      show : A -> string
-    }.
-
-  Instance showBool : Show bool :=
-    {
-      show := fun b:bool => if b then "true" else "false"
-    }.
-
-  Fixpoint string_of_nat_aux (time n : nat) (acc : string) : string :=
-    let d := match n mod 10 with
-             | 0 => "0" | 1 => "1" | 2 => "2" | 3 => "3" | 4 => "4" | 5 => "5"
-             | 6 => "6" | 7 => "7" | 8 => "8" | _ => "9"
-             end in
-    let acc' := d ++ acc in
-    match time with
+Class Show A : Type :=
+  {
+  show : A -> string
+  }.
+
+Instance showBool : Show bool :=
+  {
+  show := fun b:bool => if b then "true" else "false"
+  }.
+
+Fixpoint string_of_nat_aux (time n : nat) (acc : string) : string :=
+  let d := match n mod 10 with
+           | 0 => "0" | 1 => "1" | 2 => "2" | 3 => "3" | 4 => "4" | 5 => "5"
+           | 6 => "6" | 7 => "7" | 8 => "8" | _ => "9"
+           end in
+  let acc' := d ++ acc in
+  match time with
+  | 0 => acc'
+  | S time' =>
+    match n / 10 with
     | 0 => acc'
-    | S time' =>
-      match n / 10 with
-      | 0 => acc'
-      | n' => string_of_nat_aux time' n' acc'
-      end
-    end.
-
-  Definition string_of_nat (n : nat) : string :=
-    string_of_nat_aux n n "".
-
-  Instance showNat : Show nat :=
-    {
-      show := string_of_nat
-    }.
-
-End Show.
-Export Show.
+    | n' => string_of_nat_aux time' n' acc'
+    end
+  end.
+
+Definition string_of_nat (n : nat) : string :=
+  string_of_nat_aux n n "".
+
+Instance showNat : Show nat :=
+  {
+  show := string_of_nat
+  }.
+
+Instance showZ : Show Z :=
+  {
+  show a := show (Z.to_nat a)
+  }.
+
+Instance showPositive : Show positive :=
+  {
+  show a := show (Zpos a)
+  }.