Re: [PATCH] libxl: Introduce LIBXL_DOMAIN_TYPE_INVALID to make gcc happy

[Dario Faggioli <raistlin@linux.it>]

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On Wed, 2012-05-23 at 14:49 +0200, Dario Faggioli wrote:
> Problem arises
> with auto-generated code, e.g., in gentypes.py for build_info related
> functions. In this case, in fact, the libxl_domain_type enum is the key
> of the keyed-union. For those cases, I was thinking at something like
> the below:
> 
>     if isinstance(ty, idl.KeyedUnion):
>         if parent is None:
>             raise Exception("KeyedUnion type must have a parent")
>         s += "switch (%s) {\n" % (parent + ty.keyvar.name)
>         for f in ty.fields:
>             (nparent,fexpr) = ty.member(v, f, parent is None)
>             s += "case %s:\n" % f.enumname
>             s += libxl_C_type_dispose(f.type, fexpr, indent + "    ", nparent)
>             s += "    break;\n"
> +       s += "default:\n    break;\n";
>         s += "}\n"
> 
> Would it make sense?
> 
Like this thing below.

Christoph, this ended up extending what you sent at the very beginning
of this thread, so I think we should both sign-off-by it (and thus it
took the liberty going ahead and adding yours), do you agree?

<-----------------------

libxl: introduce LIBXL_DOMAIN_TYPE_INVALID

To avoid recent gcc complaining about:
libxl.c: In function ‘libxl_primary_console_exec’:
libxl.c:1233:9: error: case value ‘4294967295’ not in enumerated type ‘libxl_domain_type’ [-Werror=switch]

Adjust code pieces where -Wswitch makes it claim that
LIBXL_DOMAIN_TYPE_INVALID is not handled.

Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com>
Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>

diff -r 6dc80df50fa8 tools/libxl/gentest.py
--- a/tools/libxl/gentest.py	Tue May 22 16:30:11 2012 +0200
+++ b/tools/libxl/gentest.py	Wed May 23 15:05:20 2012 +0200
@@ -37,6 +37,8 @@ def gen_rand_init(ty, v, indent = "    "
             s += "case %s:\n" % f.enumname
             s += gen_rand_init(f.type, fexpr, indent + "    ", nparent)
             s += "    break;\n"
+        s += "default:\n";
+        s += "    break;\n";
         s += "}\n"
     elif isinstance(ty, idl.Struct) \
      and (parent is None or ty.json_fn is None):
diff -r 6dc80df50fa8 tools/libxl/gentypes.py
--- a/tools/libxl/gentypes.py	Tue May 22 16:30:11 2012 +0200
+++ b/tools/libxl/gentypes.py	Wed May 23 15:05:20 2012 +0200
@@ -65,6 +65,8 @@ def libxl_C_type_dispose(ty, v, indent =
             s += "case %s:\n" % f.enumname
             s += libxl_C_type_dispose(f.type, fexpr, indent + "    ", nparent)
             s += "    break;\n"
+        s += "default:\n";
+        s += "    break;\n";
         s += "}\n"
     elif isinstance(ty, idl.Struct) and (parent is None or ty.dispose_fn is None):
         for f in [f for f in ty.fields if not f.const]:
@@ -98,6 +100,8 @@ def _libxl_C_type_init(ty, v, indent = "
                 s += "case %s:\n" % f.enumname
                 s += _libxl_C_type_init(f.type, fexpr, "    ", nparent)
                 s += "    break;\n"
+            s += "default:\n";
+            s += "    break;\n";
             s += "}\n"
         else:
             if ty.keyvar.init_val:
@@ -177,6 +181,8 @@ def libxl_C_type_gen_json(ty, v, indent 
             s += "case %s:\n" % f.enumname
             s += libxl_C_type_gen_json(f.type, fexpr, indent + "    ", nparent)
             s += "    break;\n"
+        s += "default:\n";
+        s += "    break;\n";
         s += "}\n"
     elif isinstance(ty, idl.Struct) and (parent is None or ty.json_fn is None):
         s += "s = yajl_gen_map_open(hand);\n"
diff -r 6dc80df50fa8 tools/libxl/libxl.c
--- a/tools/libxl/libxl.c	Tue May 22 16:30:11 2012 +0200
+++ b/tools/libxl/libxl.c	Wed May 23 15:05:20 2012 +0200
@@ -1230,7 +1230,7 @@ int libxl_primary_console_exec(libxl_ctx
         case LIBXL_DOMAIN_TYPE_PV:
             rc = libxl_console_exec(ctx, domid_vm, 0, LIBXL_CONSOLE_TYPE_PV);
             break;
-        case -1:
+        case LIBXL_DOMAIN_TYPE_INVALID:
             LOG(ERROR,"unable to get domain type for domid=%"PRIu32,domid_vm);
             rc = ERROR_FAIL;
             break;
diff -r 6dc80df50fa8 tools/libxl/libxl_dm.c
--- a/tools/libxl/libxl_dm.c	Tue May 22 16:30:11 2012 +0200
+++ b/tools/libxl/libxl_dm.c	Wed May 23 15:05:20 2012 +0200
@@ -257,6 +257,8 @@ static char ** libxl__build_device_model
         for (i = 0; b_info->extra_hvm && b_info->extra_hvm[i] != NULL; i++)
             flexarray_append(dm_args, b_info->extra_hvm[i]);
         break;
+    case LIBXL_DOMAIN_TYPE_INVALID:
+        break;
     }
     flexarray_append(dm_args, NULL);
     return (char **) flexarray_contents(dm_args);
@@ -505,6 +507,8 @@ static char ** libxl__build_device_model
         for (i = 0; b_info->extra_hvm && b_info->extra_hvm[i] != NULL; i++)
             flexarray_append(dm_args, b_info->extra_hvm[i]);
         break;
+    case LIBXL_DOMAIN_TYPE_INVALID:
+        break;
     }
 
     ram_size = libxl__sizekb_to_mb(b_info->max_memkb - b_info->video_memkb);
diff -r 6dc80df50fa8 tools/libxl/libxl_dom.c
--- a/tools/libxl/libxl_dom.c	Tue May 22 16:30:11 2012 +0200
+++ b/tools/libxl/libxl_dom.c	Wed May 23 15:05:20 2012 +0200
@@ -33,9 +33,9 @@ libxl_domain_type libxl__domain_type(lib
 
     ret = xc_domain_getinfolist(ctx->xch, domid, 1, &info);
     if (ret != 1)
-        return -1;
+        return LIBXL_DOMAIN_TYPE_INVALID;
     if (info.domain != domid)
-        return -1;
+        return LIBXL_DOMAIN_TYPE_INVALID;
     if (info.flags & XEN_DOMINF_hvm_guest)
         return LIBXL_DOMAIN_TYPE_HVM;
     else
diff -r 6dc80df50fa8 tools/libxl/libxl_types.idl
--- a/tools/libxl/libxl_types.idl	Tue May 22 16:30:11 2012 +0200
+++ b/tools/libxl/libxl_types.idl	Wed May 23 15:05:20 2012 +0200
@@ -30,6 +30,7 @@ MemKB = UInt(64, init_val = "LIBXL_MEMKB
 #
 
 libxl_domain_type = Enumeration("domain_type", [
+    (-1, "INVALID"),
     (1, "HVM"),
     (2, "PV"),
     ])


-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://retis.sssup.it/people/faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)


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