[COMMITTED 32/40] ada: Exception-raising loop incorrectly eliminated

[Marc Poulhiès]

From: Steve Baird <ba...@adacore.com>

If the body of a loop includes a raise statement then the loop should not be
considered to be free of side-effects and therefore eligible for elimination
by the compiler.

gcc/ada/ChangeLog:

        * sem_util.adb
        (Side_Effect_Free_Statements): Return False if the statement list
        includes an explicit (i.e. Comes_From_Source) raise statement.

Tested on x86_64-pc-linux-gnu, committed on master.

---
 gcc/ada/sem_util.adb | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/gcc/ada/sem_util.adb b/gcc/ada/sem_util.adb
index ce54deaab85..97dc4c0af8b 100644
--- a/gcc/ada/sem_util.adb
+++ b/gcc/ada/sem_util.adb
@@ -12425,9 +12425,14 @@ package body Sem_Util is
 
       while Present (Node) loop
          case Nkind (Node) is
-            when N_Null_Statement | N_Call_Marker | N_Raise_xxx_Error =>
+            when N_Null_Statement | N_Call_Marker =>
                null;
 
+            when N_Raise_xxx_Error =>
+               if Comes_From_Source (Node) then
+                  return False;
+               end if;
+
             when N_Object_Declaration =>
                if Present (Expression (Node))
                  and then not Side_Effect_Free (Expression (Node))
-- 
2.43.0