From 8649f7a923acf62a478349328c31ec9abb15038b Mon Sep 17 00:00:00 2001
From: Jan Nieuwenhuizen <janneke@gnu.org>
Date: Fri, 25 Aug 2017 06:58:15 +0200
Subject: [PATCH] mescc: Tinycc support: pointer arithmetic with &variable.

* module/language/c99/compiler.mes (expr->pointer): Handle ref.
* scaffold/tests/76-pointer-arithmetic.c: Test it.
---
 module/language/c99/compiler.mes       | 1 +
 scaffold/tests/76-pointer-arithmetic.c | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/module/language/c99/compiler.mes b/module/language/c99/compiler.mes
index cbc7ca92..c64429b7 100644
--- a/module/language/c99/compiler.mes
+++ b/module/language/c99/compiler.mes
@@ -1736,6 +1736,7 @@
     ((pre-dec ,a) (expr->pointer info a))
     ((post-inc ,a) (expr->pointer info a))
     ((post-dec ,a) (expr->pointer info a))
+    ((ref-to ,expr) (1+ (expr->pointer info expr)))
     ((array-ref ,index ,array)
      (1- (expr->pointer info array)))
 
diff --git a/scaffold/tests/76-pointer-arithmetic.c b/scaffold/tests/76-pointer-arithmetic.c
index 2edb00a4..39469d43 100644
--- a/scaffold/tests/76-pointer-arithmetic.c
+++ b/scaffold/tests/76-pointer-arithmetic.c
@@ -75,6 +75,7 @@ test ()
   if (pfoo != 12) return 17;
 
   int one = 1;
+  int two = 2;
   pfoo = pfoo - one;
   eputs ("pfoo="); eputs (itoa (pfoo)); eputs ("\n");
   if (pfoo) return 18;
@@ -91,5 +92,7 @@ test ()
   eputs ("pfoo="); eputs (itoa (pfoo)); eputs ("\n");
   if (pfoo != 12) return 21;
 
+  if (&one - 1 != &two) return 22;
+
   return 0;
 }