sh4: simplify superh_cpu_class_by_name()

currently for sh4 cpu_model argument for '-cpu' option
could be either 'cpu model' name or cpu_typename.

however typically '-cpu' takes 'cpu model' name and
cpu type for sh4 target isn't advertised publicly
('-cpu help' prints only 'cpu model' names) so we
shouldn't care about this use case (it's more of a bug).

1. Drop '-cpu cpu_typename' to align with the rest of
   targets.
2. Compose searched for typename from cpu model and use
   it with object_class_by_name() directly instead of
   over-complicated
       object_class_get_list()
       g_slist_find_custom() + superh_cpu_name_compare()

With #1 droped, #2 could be used for both lookups which
simplifies superh_cpu_class_by_name() quite a bit.
Signed-off-by: NIgor Mammedov <imammedo@redhat.com>
Acked-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <1507211474-188400-23-git-send-email-imammedo@redhat.com>
[ehabkost: Include fixup sent by Igor]
Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>

linux-user/main.c

@@ -4331,7 +4331,7 @@ int main(int argc, char **argv, char **envp)
         cpu_model = "750";
 # endif
 #elif defined TARGET_SH4
-        cpu_model = TYPE_SH7785_CPU;
+        cpu_model = "sh7785";
 #elif defined TARGET_S390X
         cpu_model = "qemu";
 #else

target/sh4/cpu.c

@@ -120,36 +120,26 @@ void sh4_cpu_list(FILE *f, fprintf_function cpu_fprintf)
     g_slist_free(list);
 }
 
-static gint superh_cpu_name_compare(gconstpointer a, gconstpointer b)
-{
-    const SuperHCPUClass *scc = SUPERH_CPU_CLASS(a);
-    const char *name = b;
-
-    return strcasecmp(scc->name, name);
-}
-
 static ObjectClass *superh_cpu_class_by_name(const char *cpu_model)
 {
     ObjectClass *oc;
-    GSList *list, *item;
+    char *s, *typename = NULL;
 
-    if (strcasecmp(cpu_model, "any") == 0) {
-        return object_class_by_name(TYPE_SH7750R_CPU);
+    s = g_ascii_strdown(cpu_model, -1);
+    if (strcmp(s, "any") == 0) {
+        oc = object_class_by_name(TYPE_SH7750R_CPU);
+        goto out;
     }
 
-    oc = object_class_by_name(cpu_model);
-    if (oc != NULL && object_class_dynamic_cast(oc, TYPE_SUPERH_CPU) != NULL
-        && !object_class_is_abstract(oc)) {
-        return oc;
+    typename = g_strdup_printf(SUPERH_CPU_TYPE_NAME("%s"), s);
+    oc = object_class_by_name(typename);
+    if (oc != NULL && object_class_is_abstract(oc)) {
+        oc = NULL;
     }
 
-    oc = NULL;
-    list = object_class_get_list(TYPE_SUPERH_CPU, false);
-    item = g_slist_find_custom(list, cpu_model, superh_cpu_name_compare);
-    if (item != NULL) {
-        oc = item->data;
-    }
-    g_slist_free(list);
+out:
+    g_free(s);
+    g_free(typename);
     return oc;
 }