Re: [Qemu-devel] [PATCH v1 RFC 05/34] qom: make enum string tables const-correct

[Paolo Bonzini <pbonzini@redhat.com>]

On 17/04/2015 16:22, Daniel P. Berrange wrote:
> The enum string table parameters in various QOM/QAPI methods
> are declared 'const char *strings[]'. This results in const
> warnings if passed a variable that was declared as
> 
>    static const char * const strings[] = { .... };
> 
> Add the extra const annotation to the parameters, since
> neither the string elements, nor the array itself should
> ever be modified.
> 
> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
> ---
>  include/hw/qdev-core.h      | 2 +-
>  include/qapi/util.h         | 2 +-
>  include/qapi/visitor-impl.h | 6 +++---
>  include/qapi/visitor.h      | 2 +-
>  include/qom/object.h        | 2 +-
>  qapi/qapi-dealloc-visitor.c | 3 ++-
>  qapi/qapi-util.c            | 2 +-
>  qapi/qapi-visit-core.c      | 6 +++---
>  qom/object.c                | 2 +-
>  scripts/qapi-types.py       | 4 ++--
>  10 files changed, 16 insertions(+), 15 deletions(-)
> 
> diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h
> index 4e673f9..913963e 100644
> --- a/include/hw/qdev-core.h
> +++ b/include/hw/qdev-core.h
> @@ -236,7 +236,7 @@ struct Property {
>  struct PropertyInfo {
>      const char *name;
>      const char *description;
> -    const char **enum_table;
> +    const char * const *enum_table;
>      int (*print)(DeviceState *dev, Property *prop, char *dest, size_t len);
>      ObjectPropertyAccessor *get;
>      ObjectPropertyAccessor *set;
> diff --git a/include/qapi/util.h b/include/qapi/util.h
> index de9238b..7ad26c0 100644
> --- a/include/qapi/util.h
> +++ b/include/qapi/util.h
> @@ -11,7 +11,7 @@
>  #ifndef QAPI_UTIL_H
>  #define QAPI_UTIL_H
>  
> -int qapi_enum_parse(const char *lookup[], const char *buf,
> +int qapi_enum_parse(const char * const lookup[], const char *buf,
>                      int max, int def, Error **errp);
>  
>  #endif
> diff --git a/include/qapi/visitor-impl.h b/include/qapi/visitor-impl.h
> index 09bb0fd..f4a2f74 100644
> --- a/include/qapi/visitor-impl.h
> +++ b/include/qapi/visitor-impl.h
> @@ -30,7 +30,7 @@ struct Visitor
>      GenericList *(*next_list)(Visitor *v, GenericList **list, Error **errp);
>      void (*end_list)(Visitor *v, Error **errp);
>  
> -    void (*type_enum)(Visitor *v, int *obj, const char *strings[],
> +    void (*type_enum)(Visitor *v, int *obj, const char * const strings[],
>                        const char *kind, const char *name, Error **errp);
>      void (*get_next_type)(Visitor *v, int *kind, const int *qobjects,
>                            const char *name, Error **errp);
> @@ -59,9 +59,9 @@ struct Visitor
>      void (*end_union)(Visitor *v, bool data_present, Error **errp);
>  };
>  
> -void input_type_enum(Visitor *v, int *obj, const char *strings[],
> +void input_type_enum(Visitor *v, int *obj, const char * const strings[],
>                       const char *kind, const char *name, Error **errp);
> -void output_type_enum(Visitor *v, int *obj, const char *strings[],
> +void output_type_enum(Visitor *v, int *obj, const char * const strings[],
>                        const char *kind, const char *name, Error **errp);
>  
>  #endif
> diff --git a/include/qapi/visitor.h b/include/qapi/visitor.h
> index 5934f59..00ba104 100644
> --- a/include/qapi/visitor.h
> +++ b/include/qapi/visitor.h
> @@ -43,7 +43,7 @@ void visit_optional(Visitor *v, bool *present, const char *name,
>                      Error **errp);
>  void visit_get_next_type(Visitor *v, int *obj, const int *qtypes,
>                           const char *name, Error **errp);
> -void visit_type_enum(Visitor *v, int *obj, const char *strings[],
> +void visit_type_enum(Visitor *v, int *obj, const char * const strings[],
>                       const char *kind, const char *name, Error **errp);
>  void visit_type_int(Visitor *v, int64_t *obj, const char *name, Error **errp);
>  void visit_type_uint8(Visitor *v, uint8_t *obj, const char *name, Error **errp);
> diff --git a/include/qom/object.h b/include/qom/object.h
> index 223b577..dfdba2f 100644
> --- a/include/qom/object.h
> +++ b/include/qom/object.h
> @@ -1011,7 +1011,7 @@ int64_t object_property_get_int(Object *obj, const char *name,
>   * an enum).
>   */
>  int object_property_get_enum(Object *obj, const char *name,
> -                             const char *strings[], Error **errp);
> +                             const char * const strings[], Error **errp);
>  
>  /**
>   * object_property_get_uint16List:
> diff --git a/qapi/qapi-dealloc-visitor.c b/qapi/qapi-dealloc-visitor.c
> index a14a1c7..d7f92c5 100644
> --- a/qapi/qapi-dealloc-visitor.c
> +++ b/qapi/qapi-dealloc-visitor.c
> @@ -156,7 +156,8 @@ static void qapi_dealloc_type_size(Visitor *v, uint64_t *obj, const char *name,
>  {
>  }
>  
> -static void qapi_dealloc_type_enum(Visitor *v, int *obj, const char *strings[],
> +static void qapi_dealloc_type_enum(Visitor *v, int *obj,
> +                                   const char * const strings[],
>                                     const char *kind, const char *name,
>                                     Error **errp)
>  {
> diff --git a/qapi/qapi-util.c b/qapi/qapi-util.c
> index 1d8fb96..bcdc94d 100644
> --- a/qapi/qapi-util.c
> +++ b/qapi/qapi-util.c
> @@ -14,7 +14,7 @@
>  #include "qapi/error.h"
>  #include "qapi/util.h"
>  
> -int qapi_enum_parse(const char *lookup[], const char *buf,
> +int qapi_enum_parse(const char * const lookup[], const char *buf,
>                      int max, int def, Error **errp)
>  {
>      int i;
> diff --git a/qapi/qapi-visit-core.c b/qapi/qapi-visit-core.c
> index b66b93a..a18ba16 100644
> --- a/qapi/qapi-visit-core.c
> +++ b/qapi/qapi-visit-core.c
> @@ -89,7 +89,7 @@ void visit_get_next_type(Visitor *v, int *obj, const int *qtypes,
>      }
>  }
>  
> -void visit_type_enum(Visitor *v, int *obj, const char *strings[],
> +void visit_type_enum(Visitor *v, int *obj, const char * const strings[],
>                       const char *kind, const char *name, Error **errp)
>  {
>      v->type_enum(v, obj, strings, kind, name, errp);
> @@ -260,7 +260,7 @@ void visit_type_number(Visitor *v, double *obj, const char *name, Error **errp)
>      v->type_number(v, obj, name, errp);
>  }
>  
> -void output_type_enum(Visitor *v, int *obj, const char *strings[],
> +void output_type_enum(Visitor *v, int *obj, const char * const strings[],
>                        const char *kind, const char *name,
>                        Error **errp)
>  {
> @@ -279,7 +279,7 @@ void output_type_enum(Visitor *v, int *obj, const char *strings[],
>      visit_type_str(v, &enum_str, name, errp);
>  }
>  
> -void input_type_enum(Visitor *v, int *obj, const char *strings[],
> +void input_type_enum(Visitor *v, int *obj, const char * const strings[],
>                       const char *kind, const char *name,
>                       Error **errp)
>  {
> diff --git a/qom/object.c b/qom/object.c
> index 29c7aea..2534398 100644
> --- a/qom/object.c
> +++ b/qom/object.c
> @@ -1025,7 +1025,7 @@ int64_t object_property_get_int(Object *obj, const char *name,
>  }
>  
>  int object_property_get_enum(Object *obj, const char *name,
> -                             const char *strings[], Error **errp)
> +                             const char * const strings[], Error **errp)
>  {
>      StringOutputVisitor *sov;
>      StringInputVisitor *siv;
> diff --git a/scripts/qapi-types.py b/scripts/qapi-types.py
> index db87218..c8d6db6 100644
> --- a/scripts/qapi-types.py
> +++ b/scripts/qapi-types.py
> @@ -118,7 +118,7 @@ struct %(name)s
>  
>  def generate_enum_lookup(name, values):
>      ret = mcgen('''
> -const char *%(name)s_lookup[] = {
> +const char * const %(name)s_lookup[] = {
>  ''',
>                           name=name)
>      i = 0
> @@ -140,7 +140,7 @@ const char *%(name)s_lookup[] = {
>  
>  def generate_enum(name, values):
>      lookup_decl = mcgen('''
> -extern const char *%(name)s_lookup[];
> +extern const char * const %(name)s_lookup[];
>  ''',
>                  name=name)
>  
> 

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>