cpu: Call object_class_dynamic_cast() once in cpu_class_by_name()

For all targets, the CPU class returned from CPUClass::class_by_name()
and object_class_dynamic_cast(oc, CPU_RESOLVING_TYPE) need to be
compatible. Lets apply the check in cpu_class_by_name() for once,
instead of having the check in CPUClass::class_by_name() for individual
target.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Gavin Shan <gshan@redhat.com>
Message-ID: <20231114235628.534334-4-gshan@redhat.com>

hw/core/cpu-common.c

@@ -154,10 +154,12 @@ ObjectClass *cpu_class_by_name(const char *typename, const char *cpu_model)
     assert(cc->class_by_name);
     assert(cpu_model);
     oc = cc->class_by_name(cpu_model);
-    if (oc == NULL || object_class_is_abstract(oc)) {
-        return NULL;
+    if (object_class_dynamic_cast(oc, typename) &&
+        !object_class_is_abstract(oc)) {
+        return oc;
     }
-    return oc;
+
+    return NULL;
 }
 
 static void cpu_common_parse_features(const char *typename, char *features,

target/alpha/cpu.c

@@ -141,9 +141,6 @@ static ObjectClass *alpha_cpu_class_by_name(const char *cpu_model)
     typename = g_strdup_printf(ALPHA_CPU_TYPE_NAME("%s"), cpu_model);
     oc = object_class_by_name(typename);
     g_free(typename);
-    if (!oc || !object_class_dynamic_cast(oc, TYPE_ALPHA_CPU)) {
-        return NULL;
-    }
 
     return oc;
 }

target/arm/cpu.c

@@ -2411,9 +2411,7 @@ static ObjectClass *arm_cpu_class_by_name(const char *cpu_model)
     oc = object_class_by_name(typename);
     g_strfreev(cpuname);
     g_free(typename);
-    if (!oc || !object_class_dynamic_cast(oc, TYPE_ARM_CPU)) {
-        return NULL;
-    }
+
     return oc;
 }
 

target/avr/cpu.c

@@ -160,13 +160,7 @@ static Property avr_cpu_properties[] = {
 
 static ObjectClass *avr_cpu_class_by_name(const char *cpu_model)
 {
-    ObjectClass *oc;
-
-    oc = object_class_by_name(cpu_model);
-    if (object_class_dynamic_cast(oc, TYPE_AVR_CPU) == NULL) {
-        oc = NULL;
-    }
-    return oc;
+    return object_class_by_name(cpu_model);
 }
 
 static void avr_cpu_dump_state(CPUState *cs, FILE *f, int flags)

target/cris/cpu.c

@@ -95,9 +95,7 @@ static ObjectClass *cris_cpu_class_by_name(const char *cpu_model)
     typename = g_strdup_printf(CRIS_CPU_TYPE_NAME("%s"), cpu_model);
     oc = object_class_by_name(typename);
     g_free(typename);
-    if (oc != NULL && !object_class_dynamic_cast(oc, TYPE_CRIS_CPU)) {
-        oc = NULL;
-    }
+
     return oc;
 }
 

target/hexagon/cpu.c

@@ -63,9 +63,7 @@ static ObjectClass *hexagon_cpu_class_by_name(const char *cpu_model)
     oc = object_class_by_name(typename);
     g_strfreev(cpuname);
     g_free(typename);
-    if (!oc || !object_class_dynamic_cast(oc, TYPE_HEXAGON_CPU)) {
-        return NULL;
-    }
+
     return oc;
 }
 

target/hppa/cpu.c

@@ -160,12 +160,8 @@ static void hppa_cpu_initfn(Object *obj)
 static ObjectClass *hppa_cpu_class_by_name(const char *cpu_model)
 {
     g_autofree char *typename = g_strconcat(cpu_model, "-cpu", NULL);
-    ObjectClass *oc = object_class_by_name(typename);
 
-    if (oc && object_class_dynamic_cast(oc, TYPE_HPPA_CPU)) {
-        return oc;
-    }
-    return NULL;
+    return object_class_by_name(typename);
 }
 
 static void hppa_cpu_list_entry(gpointer data, gpointer user_data)

target/loongarch/cpu.c

@@ -718,15 +718,9 @@ static ObjectClass *loongarch_cpu_class_by_name(const char *cpu_model)
         g_autofree char *typename
             = g_strdup_printf(LOONGARCH_CPU_TYPE_NAME("%s"), cpu_model);
         oc = object_class_by_name(typename);
-        if (!oc) {
-            return NULL;
-        }
     }
 
-    if (object_class_dynamic_cast(oc, TYPE_LOONGARCH_CPU)) {
-        return oc;
-    }
-    return NULL;
+    return oc;
 }
 
 void loongarch_cpu_dump_state(CPUState *cs, FILE *f, int flags)

target/m68k/cpu.c

@@ -111,9 +111,7 @@ static ObjectClass *m68k_cpu_class_by_name(const char *cpu_model)
     typename = g_strdup_printf(M68K_CPU_TYPE_NAME("%s"), cpu_model);
     oc = object_class_by_name(typename);
     g_free(typename);
-    if (oc != NULL && object_class_dynamic_cast(oc, TYPE_M68K_CPU) == NULL) {
-        return NULL;
-    }
+
     return oc;
 }
 

target/openrisc/cpu.c

@@ -164,9 +164,7 @@ static ObjectClass *openrisc_cpu_class_by_name(const char *cpu_model)
     typename = g_strdup_printf(OPENRISC_CPU_TYPE_NAME("%s"), cpu_model);
     oc = object_class_by_name(typename);
     g_free(typename);
-    if (oc != NULL && !object_class_dynamic_cast(oc, TYPE_OPENRISC_CPU)) {
-        return NULL;
-    }
+
     return oc;
 }
 

target/riscv/cpu.c

@@ -646,9 +646,7 @@ static ObjectClass *riscv_cpu_class_by_name(const char *cpu_model)
     oc = object_class_by_name(typename);
     g_strfreev(cpuname);
     g_free(typename);
-    if (!oc || !object_class_dynamic_cast(oc, TYPE_RISCV_CPU)) {
-        return NULL;
-    }
+
     return oc;
 }
 

target/tricore/cpu.c

@@ -132,9 +132,7 @@ static ObjectClass *tricore_cpu_class_by_name(const char *cpu_model)
     typename = g_strdup_printf(TRICORE_CPU_TYPE_NAME("%s"), cpu_model);
     oc = object_class_by_name(typename);
     g_free(typename);
-    if (!oc || !object_class_dynamic_cast(oc, TYPE_TRICORE_CPU)) {
-        return NULL;
-    }
+
     return oc;
 }
 

target/xtensa/cpu.c

@@ -141,9 +141,7 @@ static ObjectClass *xtensa_cpu_class_by_name(const char *cpu_model)
     typename = g_strdup_printf(XTENSA_CPU_TYPE_NAME("%s"), cpu_model);
     oc = object_class_by_name(typename);
     g_free(typename);
-    if (oc == NULL || !object_class_dynamic_cast(oc, TYPE_XTENSA_CPU)) {
-        return NULL;
-    }
+
     return oc;
 }