[gjs/wip/ptomato/warnings: 8/10] build: Add all enum values to switch statements



commit 0adac15123022bcd397928cf4c68c0ab1cb2b467
Author: Philip Chimento <philip endlessm com>
Date:   Mon Oct 3 13:48:12 2016 -0700

    build: Add all enum values to switch statements
    
    It's become the recommended GNOME style to compile with -Wswitch-enum and
    -Wswitch-default; see AX_COMPILER_FLAGS.
    
    Per Philip Withnall, when purposely handling only a few possible enum
    values inside a switch statement, it's better to use if statements.
    
    On the other hand, when doing the much more common pattern of
    
        default:
            g_assert_not_reached();
    
    it's better to list exactly which cases should not be reached, as well as
    guard against invalid values with the default label.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=773297

 gi/arg.cpp                |  222 +++++++++++++++++++--------------------------
 gi/boxed.cpp              |   53 ++++++-----
 gi/function.cpp           |  110 +++++++++++-----------
 gi/object.cpp             |    2 +
 gi/repo.cpp               |   15 +++-
 gi/value.cpp              |   11 +--
 gjs/importer.cpp          |    3 +
 gjs/jsapi-private.cpp     |    3 +-
 modules/cairo-pattern.cpp |   11 +-
 modules/cairo-surface.cpp |   21 ++---
 10 files changed, 212 insertions(+), 239 deletions(-)
---
diff --git a/gi/arg.cpp b/gi/arg.cpp
index ff2b6c6..8f5b0bb 100644
--- a/gi/arg.cpp
+++ b/gi/arg.cpp
@@ -116,15 +116,11 @@ _gjs_enum_value_is_valid(JSContext  *context,
 static bool
 _gjs_enum_uses_signed_type (GIEnumInfo *enum_info)
 {
-    switch (g_enum_info_get_storage_type (enum_info)) {
-    case GI_TYPE_TAG_INT8:
-    case GI_TYPE_TAG_INT16:
-    case GI_TYPE_TAG_INT32:
-    case GI_TYPE_TAG_INT64:
-        return true;
-    default:
-        return false;
-    }
+    GITypeTag storage = g_enum_info_get_storage_type(enum_info);
+    return (storage == GI_TYPE_TAG_INT8 ||
+        storage == GI_TYPE_TAG_INT16 ||
+        storage == GI_TYPE_TAG_INT32 ||
+        storage == GI_TYPE_TAG_INT64);
 }
 
 /* This is hacky - g_function_info_invoke() and g_field_info_get/set_field() expect
@@ -159,16 +155,16 @@ static bool
 type_needs_release (GITypeInfo *type_info,
                     GITypeTag   type_tag)
 {
-    switch (type_tag) {
-    case GI_TYPE_TAG_UTF8:
-    case GI_TYPE_TAG_FILENAME:
-    case GI_TYPE_TAG_ARRAY:
-    case GI_TYPE_TAG_GLIST:
-    case GI_TYPE_TAG_GSLIST:
-    case GI_TYPE_TAG_GHASH:
-    case GI_TYPE_TAG_ERROR:
+    if (type_tag == GI_TYPE_TAG_UTF8 ||
+        type_tag == GI_TYPE_TAG_FILENAME ||
+        type_tag == GI_TYPE_TAG_ARRAY ||
+        type_tag == GI_TYPE_TAG_GLIST ||
+        type_tag == GI_TYPE_TAG_GSLIST ||
+        type_tag == GI_TYPE_TAG_GHASH ||
+        type_tag == GI_TYPE_TAG_ERROR)
         return true;
-    case GI_TYPE_TAG_INTERFACE: {
+
+    if (type_tag == GI_TYPE_TAG_INTERFACE) {
         GIBaseInfo* interface_info;
         GIInfoType interface_type;
         GType gtype;
@@ -179,30 +175,23 @@ type_needs_release (GITypeInfo *type_info,
 
         interface_type = g_base_info_get_type(interface_info);
 
-        switch(interface_type) {
-
-        case GI_INFO_TYPE_STRUCT:
-        case GI_INFO_TYPE_ENUM:
-        case GI_INFO_TYPE_FLAGS:
-        case GI_INFO_TYPE_OBJECT:
-        case GI_INFO_TYPE_INTERFACE:
-        case GI_INFO_TYPE_UNION:
-        case GI_INFO_TYPE_BOXED:
+        if (interface_type == GI_INFO_TYPE_STRUCT ||
+            interface_type == GI_INFO_TYPE_ENUM ||
+            interface_type == GI_INFO_TYPE_FLAGS ||
+            interface_type == GI_INFO_TYPE_OBJECT ||
+            interface_type == GI_INFO_TYPE_INTERFACE ||
+            interface_type == GI_INFO_TYPE_UNION ||
+            interface_type == GI_INFO_TYPE_BOXED) {
             /* These are subtypes of GIRegisteredTypeInfo for which the
              * cast is safe */
             gtype = g_registered_type_info_get_g_type
                 ((GIRegisteredTypeInfo*)interface_info);
-            break;
-
-        case GI_INFO_TYPE_VALUE:
+        } else if (interface_type == GI_INFO_TYPE_VALUE) {
             /* Special case for GValues */
             gtype = G_TYPE_VALUE;
-            break;
-
-        default:
+        } else {
             /* Everything else */
             gtype = G_TYPE_NONE;
-            break;
         }
 
         if (g_type_is_a(gtype, G_TYPE_CLOSURE))
@@ -216,9 +205,8 @@ type_needs_release (GITypeInfo *type_info,
 
         return needs_release;
     }
-    default:
-        return false;
-    }
+
+    return false;
 }
 
 /* Check if an argument of the given needs to be released if we obtained it
@@ -228,47 +216,38 @@ static bool
 type_needs_out_release(GITypeInfo *type_info,
                        GITypeTag   type_tag)
 {
-    switch (type_tag) {
-    case GI_TYPE_TAG_UTF8:
-    case GI_TYPE_TAG_FILENAME:
-    case GI_TYPE_TAG_ARRAY:
-    case GI_TYPE_TAG_GLIST:
-    case GI_TYPE_TAG_GSLIST:
-    case GI_TYPE_TAG_GHASH:
-    case GI_TYPE_TAG_ERROR:
+    if (type_tag == GI_TYPE_TAG_UTF8 ||
+        type_tag == GI_TYPE_TAG_FILENAME ||
+        type_tag == GI_TYPE_TAG_ARRAY ||
+        type_tag == GI_TYPE_TAG_GLIST ||
+        type_tag == GI_TYPE_TAG_GSLIST ||
+        type_tag == GI_TYPE_TAG_GHASH ||
+        type_tag == GI_TYPE_TAG_ERROR)
         return true;
-    case GI_TYPE_TAG_INTERFACE: {
+
+    if (type_tag == GI_TYPE_TAG_INTERFACE) {
         GIBaseInfo* interface_info;
         GIInfoType interface_type;
-        bool needs_release;
+        bool needs_release = true;
 
         interface_info = g_type_info_get_interface(type_info);
         g_assert(interface_info != NULL);
 
         interface_type = g_base_info_get_type(interface_info);
 
-        switch(interface_type) {
-        case GI_INFO_TYPE_ENUM:
-        case GI_INFO_TYPE_FLAGS:
+        if (interface_type == GI_INFO_TYPE_ENUM ||
+            interface_type == GI_INFO_TYPE_FLAGS)
             needs_release = false;
-            break;
-
-        case GI_INFO_TYPE_STRUCT:
-        case GI_INFO_TYPE_UNION:
-            needs_release = g_type_info_is_pointer (type_info);
-            break;
-
-        default:
-            needs_release = true;
-        }
+        else if (interface_type == GI_INFO_TYPE_STRUCT ||
+            interface_type == GI_INFO_TYPE_UNION)
+            needs_release = g_type_info_is_pointer(type_info);
 
         g_base_info_unref(interface_info);
 
         return needs_release;
     }
-    default:
-        return false;
-    }
+
+    return false;
 }
 
 static bool
@@ -514,25 +493,23 @@ gjs_string_to_intarray(JSContext   *context,
 
     element_type = g_type_info_get_tag(param_info);
 
-    switch (element_type) {
-    case GI_TYPE_TAG_INT8:
-    case GI_TYPE_TAG_UINT8:
+    if (element_type == GI_TYPE_TAG_INT8 || element_type == GI_TYPE_TAG_UINT8) {
         if (!gjs_string_to_utf8(context, string_val, &result))
             return false;
         *arr_p = result;
         *length = strlen(result);
         return true;
+    }
 
-    case GI_TYPE_TAG_INT16:
-    case GI_TYPE_TAG_UINT16:
+    if (element_type == GI_TYPE_TAG_INT16 || element_type == GI_TYPE_TAG_UINT16) {
         if (!gjs_string_get_uint16_data(context, string_val,
                                         &result16, length))
             return false;
         *arr_p = result16;
         return true;
+    }
 
-    case GI_TYPE_TAG_UNICHAR:
-    {
+    if (element_type == GI_TYPE_TAG_UNICHAR) {
         gunichar *result_ucs4;
         JS::RootedValue root(context, string_val);
         if (!gjs_string_to_ucs4(context, root, &result_ucs4, length))
@@ -541,12 +518,10 @@ gjs_string_to_intarray(JSContext   *context,
         return true;
     }
 
-    default:
-        /* can't convert a string to this type */
-        gjs_throw(context, "Cannot convert string to array of '%s'",
-                  g_type_tag_to_string (element_type));
-        return false;
-    }
+    /* can't convert a string to this type */
+    gjs_throw(context, "Cannot convert string to array of '%s'",
+              g_type_tag_to_string (element_type));
+    return false;
 }
 
 static bool
@@ -850,28 +825,18 @@ static bool
 is_gvalue(GIBaseInfo *info,
           GIInfoType  info_type)
 {
-    bool result = false;
-
-    switch(info_type) {
-    case GI_INFO_TYPE_VALUE:
-        result = true;
-        break;
-    case GI_INFO_TYPE_STRUCT:
-    case GI_INFO_TYPE_OBJECT:
-    case GI_INFO_TYPE_INTERFACE:
-    case GI_INFO_TYPE_BOXED:
-        {
-            GType gtype;
-            gtype = g_registered_type_info_get_g_type((GIRegisteredTypeInfo *) info);
+    if (info_type == GI_INFO_TYPE_VALUE)
+        return true;
 
-            result = g_type_is_a(gtype, G_TYPE_VALUE);
-        }
-        break;
-    default:
-        break;
+    if (info_type == GI_INFO_TYPE_STRUCT ||
+        info_type == GI_INFO_TYPE_OBJECT ||
+        info_type == GI_INFO_TYPE_INTERFACE ||
+        info_type == GI_INFO_TYPE_BOXED) {
+        GType gtype = g_registered_type_info_get_g_type((GIRegisteredTypeInfo *) info);
+        return g_type_is_a(gtype, G_TYPE_VALUE);
     }
 
-    return result;
+    return false;
 }
 
 static bool
@@ -977,6 +942,7 @@ gjs_array_to_array(JSContext   *context,
                                      transfer == GI_TRANSFER_CONTAINER ? GI_TRANSFER_NOTHING : transfer,
                                      param_info,
                                      arr_p);
+    case GI_TYPE_TAG_VOID:
     default:
         gjs_throw(context,
                   "Unhandled array element type %d", element_type);
@@ -1047,6 +1013,7 @@ gjs_g_array_new_for_type(JSContext    *context,
     case GI_TYPE_TAG_ERROR:
       element_size = sizeof(gpointer);
       break;
+    case GI_TYPE_TAG_VOID:
     default:
         gjs_throw(context,
                   "Unhandled GArray element-type %d", element_type);
@@ -1073,9 +1040,9 @@ get_argument_display_name(const char     *arg_name,
         return g_strdup("Hash element");
     case GJS_ARGUMENT_ARRAY_ELEMENT:
         return g_strdup("Array element");
+    default:
+        g_assert_not_reached ();
     }
-
-    g_assert_not_reached ();
 }
 
 static const char *
@@ -1407,37 +1374,32 @@ gjs_value_to_g_argument(JSContext      *context,
                 expect_object = true;
             }
 
-            switch(interface_type) {
-            case GI_INFO_TYPE_STRUCT:
-                if (g_struct_info_is_foreign((GIStructInfo*)interface_info)) {
-                    bool ret;
-                    ret = gjs_struct_foreign_convert_to_g_argument(
-                            context, value, interface_info, arg_name,
-                            arg_type, transfer, may_be_null, arg);
-                    g_base_info_unref(interface_info);
-                    return ret;
-                }
-                /* fall through */
-            case GI_INFO_TYPE_ENUM:
-            case GI_INFO_TYPE_FLAGS:
-            case GI_INFO_TYPE_OBJECT:
-            case GI_INFO_TYPE_INTERFACE:
-            case GI_INFO_TYPE_UNION:
-            case GI_INFO_TYPE_BOXED:
+            if (interface_type == GI_INFO_TYPE_STRUCT &&
+                g_struct_info_is_foreign((GIStructInfo*)interface_info)) {
+                bool ret;
+                ret = gjs_struct_foreign_convert_to_g_argument(
+                        context, value, interface_info, arg_name,
+                        arg_type, transfer, may_be_null, arg);
+                g_base_info_unref(interface_info);
+                return ret;
+            }
+
+            if (interface_type == GI_INFO_TYPE_STRUCT ||
+                interface_type == GI_INFO_TYPE_ENUM ||
+                interface_type == GI_INFO_TYPE_FLAGS ||
+                interface_type == GI_INFO_TYPE_OBJECT ||
+                interface_type == GI_INFO_TYPE_INTERFACE ||
+                interface_type == GI_INFO_TYPE_UNION ||
+                interface_type == GI_INFO_TYPE_BOXED) {
                 /* These are subtypes of GIRegisteredTypeInfo for which the
                  * cast is safe */
                 gtype = g_registered_type_info_get_g_type
                     ((GIRegisteredTypeInfo*)interface_info);
-                break;
-            case GI_INFO_TYPE_VALUE:
+            } else if (interface_type == GI_INFO_TYPE_VALUE) {
                 /* Special case for GValues */
                 gtype = G_TYPE_VALUE;
-                break;
-
-            default:
-                /* Everything else */
+            } else {
                 gtype = G_TYPE_NONE;
-                break;
             }
 
             if (gtype != G_TYPE_NONE)
@@ -1956,19 +1918,14 @@ gjs_g_argument_init_default(JSContext      *context,
 
             interface_type = g_base_info_get_type(interface_info);
 
-            switch(interface_type) {
-            case GI_INFO_TYPE_ENUM:
-            case GI_INFO_TYPE_FLAGS:
+            if (interface_type == GI_INFO_TYPE_ENUM ||
+                interface_type == GI_INFO_TYPE_FLAGS)
                 arg->v_int = 0;
-                break;
-            case GI_INFO_TYPE_VALUE:
+            else if (interface_type == GI_INFO_TYPE_VALUE)
                 /* Better to use a non-NULL value holding NULL? */
                 arg->v_pointer = NULL;
-                break;
-            default:
+            else
                 arg->v_pointer = NULL;
-                break;
-            }
 
             g_base_info_unref( (GIBaseInfo*) interface_info);
         }
@@ -2220,6 +2177,7 @@ gjs_array_from_carray_internal (JSContext             *context,
         case GI_TYPE_TAG_ERROR:
           ITERATE(pointer);
           break;
+        case GI_TYPE_TAG_VOID:
         default:
           gjs_throw(context, "Unknown Array element-type %d", element_type);
           return false;
@@ -2302,6 +2260,7 @@ gjs_array_from_boxed_array (JSContext             *context,
         data = ptr_array->pdata;
         length = ptr_array->len;
         break;
+    case GI_ARRAY_TYPE_C: /* already checked in gjs_value_from_g_argument() */
     default:
         g_assert_not_reached();
     }
@@ -2409,6 +2368,7 @@ gjs_array_from_zero_terminated_c_array (JSContext             *context,
         case GI_TYPE_TAG_BOOLEAN:
             gjs_throw(context, "Boolean zero-terminated array not supported");
             return false;
+        case GI_TYPE_TAG_VOID:
         default:
           gjs_throw(context, "Unknown element-type %d", element_type);
           return false;
@@ -3181,6 +3141,7 @@ gjs_g_arg_release_internal(JSContext  *context,
                 g_free (arg->v_pointer);
                 break;
 
+            case GI_TYPE_TAG_VOID:
             default:
                 gjs_throw(context,
                           "Releasing a C array with explicit length, that was nested"
@@ -3243,6 +3204,7 @@ gjs_g_arg_release_internal(JSContext  *context,
 
                 break;
 
+            case GI_TYPE_TAG_VOID:
             default:
                 gjs_throw(context,
                           "Don't know how to release GArray element-type %d",
diff --git a/gi/boxed.cpp b/gi/boxed.cpp
index ccd6f9f..6191272 100644
--- a/gi/boxed.cpp
+++ b/gi/boxed.cpp
@@ -940,29 +940,6 @@ type_can_be_allocated_directly(GITypeInfo *type_info)
         }
     } else {
         switch (g_type_info_get_tag(type_info)) {
-        case GI_TYPE_TAG_BOOLEAN:
-        case GI_TYPE_TAG_INT8:
-        case GI_TYPE_TAG_UINT8:
-        case GI_TYPE_TAG_INT16:
-        case GI_TYPE_TAG_UINT16:
-        case GI_TYPE_TAG_INT32:
-        case GI_TYPE_TAG_UINT32:
-        case GI_TYPE_TAG_INT64:
-        case GI_TYPE_TAG_UINT64:
-        case GI_TYPE_TAG_FLOAT:
-        case GI_TYPE_TAG_DOUBLE:
-        case GI_TYPE_TAG_UNICHAR:
-            break;
-        case GI_TYPE_TAG_VOID:
-        case GI_TYPE_TAG_GTYPE:
-        case GI_TYPE_TAG_ERROR:
-        case GI_TYPE_TAG_UTF8:
-        case GI_TYPE_TAG_FILENAME:
-        case GI_TYPE_TAG_ARRAY:
-        case GI_TYPE_TAG_GLIST:
-        case GI_TYPE_TAG_GSLIST:
-        case GI_TYPE_TAG_GHASH:
-            break;
         case GI_TYPE_TAG_INTERFACE:
             {
                 GIBaseInfo *interface = g_type_info_get_interface(type_info);
@@ -976,9 +953,6 @@ type_can_be_allocated_directly(GITypeInfo *type_info)
                     /* FIXME: Need to implement */
                     is_simple = false;
                     break;
-                case GI_INFO_TYPE_ENUM:
-                case GI_INFO_TYPE_FLAGS:
-                    break;
                 case GI_INFO_TYPE_OBJECT:
                 case GI_INFO_TYPE_VFUNC:
                 case GI_INFO_TYPE_CALLBACK:
@@ -998,11 +972,38 @@ type_can_be_allocated_directly(GITypeInfo *type_info)
                 case GI_INFO_TYPE_INVALID_0:
                     g_assert_not_reached();
                     break;
+                case GI_INFO_TYPE_ENUM:
+                case GI_INFO_TYPE_FLAGS:
+                default:
+                    break;
                 }
 
                 g_base_info_unref(interface);
                 break;
             }
+        case GI_TYPE_TAG_BOOLEAN:
+        case GI_TYPE_TAG_INT8:
+        case GI_TYPE_TAG_UINT8:
+        case GI_TYPE_TAG_INT16:
+        case GI_TYPE_TAG_UINT16:
+        case GI_TYPE_TAG_INT32:
+        case GI_TYPE_TAG_UINT32:
+        case GI_TYPE_TAG_INT64:
+        case GI_TYPE_TAG_UINT64:
+        case GI_TYPE_TAG_FLOAT:
+        case GI_TYPE_TAG_DOUBLE:
+        case GI_TYPE_TAG_UNICHAR:
+        case GI_TYPE_TAG_VOID:
+        case GI_TYPE_TAG_GTYPE:
+        case GI_TYPE_TAG_ERROR:
+        case GI_TYPE_TAG_UTF8:
+        case GI_TYPE_TAG_FILENAME:
+        case GI_TYPE_TAG_ARRAY:
+        case GI_TYPE_TAG_GLIST:
+        case GI_TYPE_TAG_GSLIST:
+        case GI_TYPE_TAG_GHASH:
+        default:
+            break;
         }
     }
     return is_simple;
diff --git a/gi/function.cpp b/gi/function.cpp
index ce542d2..3bd2030 100644
--- a/gi/function.cpp
+++ b/gi/function.cpp
@@ -104,6 +104,8 @@ set_return_ffi_arg_from_giargument (GITypeInfo  *ret_type,
                                     GIArgument  *return_value)
 {
     switch (g_type_info_get_tag(ret_type)) {
+    case GI_TYPE_TAG_VOID:
+        g_assert_not_reached();
     case GI_TYPE_TAG_INT8:
         *(ffi_sarg *) result = return_value->v_int8;
         break;
@@ -128,9 +130,6 @@ set_return_ffi_arg_from_giargument (GITypeInfo  *ret_type,
     case GI_TYPE_TAG_INT64:
         *(ffi_sarg *) result = return_value->v_int64;
         break;
-    case GI_TYPE_TAG_UINT64:
-        *(ffi_arg *) result = return_value->v_uint64;
-        break;
     case GI_TYPE_TAG_INTERFACE:
         {
             GIBaseInfo* interface_info;
@@ -139,18 +138,26 @@ set_return_ffi_arg_from_giargument (GITypeInfo  *ret_type,
             interface_info = g_type_info_get_interface(ret_type);
             interface_type = g_base_info_get_type(interface_info);
 
-            switch (interface_type) {
-            case GI_INFO_TYPE_ENUM:
-            case GI_INFO_TYPE_FLAGS:
+            if (interface_type == GI_INFO_TYPE_ENUM ||
+                interface_type == GI_INFO_TYPE_FLAGS)
                 *(ffi_sarg *) result = return_value->v_long;
-                break;
-            default:
+            else
                 *(ffi_arg *) result = (ffi_arg) return_value->v_pointer;
-                break;
-            }
 
             g_base_info_unref(interface_info);
         }
+    case GI_TYPE_TAG_UINT64:
+    /* Other primitive and pointer types need to squeeze into 64-bit ffi_arg too */
+    case GI_TYPE_TAG_FLOAT:
+    case GI_TYPE_TAG_DOUBLE:
+    case GI_TYPE_TAG_GTYPE:
+    case GI_TYPE_TAG_UTF8:
+    case GI_TYPE_TAG_FILENAME:
+    case GI_TYPE_TAG_ARRAY:
+    case GI_TYPE_TAG_GLIST:
+    case GI_TYPE_TAG_GSLIST:
+    case GI_TYPE_TAG_GHASH:
+    case GI_TYPE_TAG_ERROR:
     default:
         *(ffi_arg *) result = (ffi_arg) return_value->v_uint64;
         break;
@@ -265,6 +272,9 @@ gjs_callback_closure(ffi_cif *cif,
                                                (GArgument *) args[i], false))
                     goto out;
                 break;
+            case PARAM_CALLBACK:
+                /* Callbacks that accept another callback as a parameter are not
+                 * supported, see gjs_callback_trampoline_new() */
             default:
                 g_assert_not_reached();
         }
@@ -517,26 +527,23 @@ gjs_callback_trampoline_new(JSContext      *context,
 static unsigned long
 get_length_from_arg (GArgument *arg, GITypeTag tag)
 {
-    switch (tag) {
-    case GI_TYPE_TAG_INT8:
+    if (tag == GI_TYPE_TAG_INT8)
         return arg->v_int8;
-    case GI_TYPE_TAG_UINT8:
+    if (tag == GI_TYPE_TAG_UINT8)
         return arg->v_uint8;
-    case GI_TYPE_TAG_INT16:
+    if (tag == GI_TYPE_TAG_INT16)
         return arg->v_int16;
-    case GI_TYPE_TAG_UINT16:
+    if (tag == GI_TYPE_TAG_UINT16)
         return arg->v_uint16;
-    case GI_TYPE_TAG_INT32:
+    if (tag == GI_TYPE_TAG_INT32)
         return arg->v_int32;
-    case GI_TYPE_TAG_UINT32:
+    if (tag == GI_TYPE_TAG_UINT32)
         return arg->v_uint32;
-    case GI_TYPE_TAG_INT64:
+    if (tag == GI_TYPE_TAG_INT64)
         return arg->v_int64;
-    case GI_TYPE_TAG_UINT64:
+    if (tag == GI_TYPE_TAG_UINT64)
         return arg->v_uint64;
-    default:
-        g_assert_not_reached ();
-    }
+    g_assert_not_reached();
 }
 
 static bool
@@ -550,9 +557,7 @@ gjs_fill_method_instance(JSContext       *context,
     GType gtype = g_registered_type_info_get_g_type ((GIRegisteredTypeInfo *)container);
     GITransfer transfer = g_callable_info_get_instance_ownership_transfer (function->info);
 
-    switch (type) {
-    case GI_INFO_TYPE_STRUCT:
-    case GI_INFO_TYPE_BOXED:
+    if (type == GI_INFO_TYPE_STRUCT || type == GI_INFO_TYPE_BOXED) {
         /* GError must be special cased */
         if (g_type_is_a(gtype, G_TYPE_ERROR)) {
             if (!gjs_typecheck_gerror(context, obj, true))
@@ -600,19 +605,16 @@ gjs_fill_method_instance(JSContext       *context,
                 }
             }
         }
-        break;
 
-    case GI_INFO_TYPE_UNION:
+    } else if (type == GI_INFO_TYPE_UNION) {
         if (!gjs_typecheck_union(context, obj, container, gtype, true))
             return false;
 
         out_arg->v_pointer = gjs_c_union_from_union(context, obj);
         if (transfer == GI_TRANSFER_EVERYTHING)
             out_arg->v_pointer = g_boxed_copy (gtype, out_arg->v_pointer);
-        break;
 
-    case GI_INFO_TYPE_OBJECT:
-    case GI_INFO_TYPE_INTERFACE:
+    } else if (type == GI_INFO_TYPE_OBJECT || type == GI_INFO_TYPE_INTERFACE) {
         if (g_type_is_a(gtype, G_TYPE_OBJECT)) {
             if (!gjs_typecheck_object(context, obj, gtype, true))
                 return false;
@@ -652,9 +654,8 @@ gjs_fill_method_instance(JSContext       *context,
                              g_base_info_get_name(container));
             return false;
         }
-        break;
 
-    default:
+    } else {
         g_assert_not_reached();
     }
 
@@ -795,35 +796,31 @@ gjs_invoke_c_function(JSContext       *context,
                 g_arg_info_load_type(&arg_info, &ainfo);
                 type_tag = g_type_info_get_tag(&ainfo);
 
-                switch (type_tag) {
-                case GI_TYPE_TAG_INTERFACE:
-                    {
-                        GIBaseInfo* interface_info;
-                        GIInfoType interface_type;
-                        gsize size;
+                if (type_tag == GI_TYPE_TAG_INTERFACE) {
+                    GIBaseInfo* interface_info;
+                    GIInfoType interface_type;
+                    gsize size;
 
-                        interface_info = g_type_info_get_interface(&ainfo);
-                        g_assert(interface_info != NULL);
+                    interface_info = g_type_info_get_interface(&ainfo);
+                    g_assert(interface_info != NULL);
 
-                        interface_type = g_base_info_get_type(interface_info);
+                    interface_type = g_base_info_get_type(interface_info);
 
-                        if (interface_type == GI_INFO_TYPE_STRUCT) {
-                            size = g_struct_info_get_size((GIStructInfo*)interface_info);
-                        } else if (interface_type == GI_INFO_TYPE_UNION) {
-                            size = g_union_info_get_size((GIUnionInfo*)interface_info);
-                        } else {
-                            failed = true;
-                        }
+                    if (interface_type == GI_INFO_TYPE_STRUCT) {
+                        size = g_struct_info_get_size((GIStructInfo*)interface_info);
+                    } else if (interface_type == GI_INFO_TYPE_UNION) {
+                        size = g_union_info_get_size((GIUnionInfo*)interface_info);
+                    } else {
+                        failed = true;
+                    }
 
-                        g_base_info_unref((GIBaseInfo*)interface_info);
+                    g_base_info_unref((GIBaseInfo*)interface_info);
 
-                        if (!failed) {
-                            in_arg_cvalues[c_arg_pos].v_pointer = g_slice_alloc0(size);
-                            out_arg_cvalues[c_arg_pos].v_pointer = in_arg_cvalues[c_arg_pos].v_pointer;
-                        }
-                        break;
+                    if (!failed) {
+                        in_arg_cvalues[c_arg_pos].v_pointer = g_slice_alloc0(size);
+                        out_arg_cvalues[c_arg_pos].v_pointer = in_arg_cvalues[c_arg_pos].v_pointer;
                     }
-                default:
+                } else {
                     failed = true;
                 }
                 if (failed)
@@ -945,6 +942,9 @@ gjs_invoke_c_function(JSContext       *context,
                     failed = true;
                     break;
                 }
+
+            default:
+                ;
             }
 
             if (direction == GI_DIRECTION_INOUT && !arg_removed && !failed) {
diff --git a/gi/object.cpp b/gi/object.cpp
index d993442..d2adc47 100644
--- a/gi/object.cpp
+++ b/gi/object.cpp
@@ -359,6 +359,7 @@ object_instance_set_prop(JSContext              *context,
     case NO_SUCH_G_PROPERTY:
         goto out;
     case VALUE_WAS_SET:
+    default:
         break;
     }
 
@@ -721,6 +722,7 @@ object_instance_props_to_g_parameters(JSContext               *context,
             g_free(name);
             goto free_array_and_fail;
         case VALUE_WAS_SET:
+        default:
             break;
         }
 
diff --git a/gi/repo.cpp b/gi/repo.cpp
index 82d68bf..d6e30f0 100644
--- a/gi/repo.cpp
+++ b/gi/repo.cpp
@@ -525,6 +525,17 @@ gjs_define_info(JSContext  *context,
                                    g_registered_type_info_get_g_type((GIRegisteredTypeInfo *) info),
                                    NULL);
         break;
+    case GI_INFO_TYPE_INVALID:
+    case GI_INFO_TYPE_INVALID_0:
+    case GI_INFO_TYPE_CALLBACK:
+    case GI_INFO_TYPE_VALUE:
+    case GI_INFO_TYPE_SIGNAL:
+    case GI_INFO_TYPE_VFUNC:
+    case GI_INFO_TYPE_PROPERTY:
+    case GI_INFO_TYPE_FIELD:
+    case GI_INFO_TYPE_ARG:
+    case GI_INFO_TYPE_TYPE:
+    case GI_INFO_TYPE_UNRESOLVED:
     default:
         gjs_throw(context, "API of type %s not implemented, cannot define %s.%s",
                   gjs_info_type_name(g_base_info_get_type(info)),
@@ -703,9 +714,9 @@ gjs_info_type_name(GIInfoType type)
     case GI_INFO_TYPE_INVALID_0:
         g_assert_not_reached();
         break;
+    default:
+      return "???";
     }
-
-    return "???";
 }
 
 char*
diff --git a/gi/value.cpp b/gi/value.cpp
index c2114c7..a3da3fc 100644
--- a/gi/value.cpp
+++ b/gi/value.cpp
@@ -890,17 +890,14 @@ gjs_value_from_g_value_internal(JSContext             *context,
             return ret;
         }
 
-        switch (g_base_info_get_type(info)) {
-        case GI_INFO_TYPE_BOXED:
-        case GI_INFO_TYPE_STRUCT:
+        GIInfoType type = g_base_info_get_type(info);
+        if (type == GI_INFO_TYPE_BOXED || type == GI_INFO_TYPE_STRUCT) {
             if (no_copy)
                 boxed_flags = (GjsBoxedCreationFlags) (boxed_flags | GJS_BOXED_CREATION_NO_COPY);
             obj = gjs_boxed_from_c_struct(context, (GIStructInfo *)info, gboxed, boxed_flags);
-            break;
-        case GI_INFO_TYPE_UNION:
+        } else if (type == GI_INFO_TYPE_UNION) {
             obj = gjs_union_from_c_union(context, (GIUnionInfo *)info, gboxed);
-            break;
-        default:
+        } else {
             gjs_throw(context,
                       "Unexpected introspection type %d for %s",
                       g_base_info_get_type(info),
diff --git a/gjs/importer.cpp b/gjs/importer.cpp
index dff706e..39428e8 100644
--- a/gjs/importer.cpp
+++ b/gjs/importer.cpp
@@ -824,6 +824,9 @@ importer_new_enumerate(JSContext  *context,
             statep.setNull();
         }
     }
+
+    default:
+        ;
     }
 
     return true;
diff --git a/gjs/jsapi-private.cpp b/gjs/jsapi-private.cpp
index 6469c82..36a83d6 100644
--- a/gjs/jsapi-private.cpp
+++ b/gjs/jsapi-private.cpp
@@ -59,13 +59,12 @@ gjs_error_reporter(JSContext     *context,
         level = G_LOG_LEVEL_MESSAGE;
 
         /* suppress bogus warnings. See mozilla/js/src/js.msg */
-        switch (report->errorNumber) {
+        if (report->errorNumber == 162) {
             /* 162, JSMSG_UNDEFINED_PROP: warns every time a lazy property
              * is resolved, since the property starts out
              * undefined. When this is a real bug it should usually
              * fail somewhere else anyhow.
              */
-        case 162:
             return;
         }
     } else {
diff --git a/modules/cairo-pattern.cpp b/modules/cairo-pattern.cpp
index cab1a09..7d00ffe 100644
--- a/modules/cairo-pattern.cpp
+++ b/modules/cairo-pattern.cpp
@@ -167,13 +167,14 @@ gjs_cairo_pattern_from_pattern(JSContext       *context,
             return gjs_cairo_linear_gradient_from_pattern(context, pattern);
         case CAIRO_PATTERN_TYPE_RADIAL:
             return gjs_cairo_radial_gradient_from_pattern(context, pattern);
+        case CAIRO_PATTERN_TYPE_MESH:
+        case CAIRO_PATTERN_TYPE_RASTER_SOURCE:
         default:
-            break;
+            gjs_throw(context,
+                      "failed to create pattern, unsupported pattern type %d",
+                      cairo_pattern_get_type(pattern));
+            return NULL;
     }
-
-    gjs_throw(context, "failed to create pattern, unsupported pattern type %d",
-              cairo_pattern_get_type(pattern));
-    return NULL;
 }
 
 /**
diff --git a/modules/cairo-surface.cpp b/modules/cairo-surface.cpp
index e1a43ed..2eb8614 100644
--- a/modules/cairo-surface.cpp
+++ b/modules/cairo-surface.cpp
@@ -195,18 +195,15 @@ gjs_cairo_surface_from_surface(JSContext       *context,
     g_return_val_if_fail(context != NULL, NULL);
     g_return_val_if_fail(surface != NULL, NULL);
 
-    switch (cairo_surface_get_type(surface)) {
-        case CAIRO_SURFACE_TYPE_IMAGE:
-            return gjs_cairo_image_surface_from_surface(context, surface);
-        case CAIRO_SURFACE_TYPE_PDF:
-            return gjs_cairo_pdf_surface_from_surface(context, surface);
-        case CAIRO_SURFACE_TYPE_PS:
-            return gjs_cairo_ps_surface_from_surface(context, surface);
-        case CAIRO_SURFACE_TYPE_SVG:
-            return gjs_cairo_svg_surface_from_surface(context, surface);
-        default:
-            break;
-    }
+    cairo_surface_type_t type = cairo_surface_get_type(surface);
+    if (type == CAIRO_SURFACE_TYPE_IMAGE)
+        return gjs_cairo_image_surface_from_surface(context, surface);
+    if (type == CAIRO_SURFACE_TYPE_PDF)
+        return gjs_cairo_pdf_surface_from_surface(context, surface);
+    if (type == CAIRO_SURFACE_TYPE_PS)
+        return gjs_cairo_ps_surface_from_surface(context, surface);
+    if (type == CAIRO_SURFACE_TYPE_SVG)
+        return gjs_cairo_svg_surface_from_surface(context, surface);
 
     JS::RootedObject object(context,
                             JS_NewObject(context, &gjs_cairo_surface_class, NULL, NULL));


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