Re: [Qemu-devel] [PATCH v4 16/20] hw/acpi/aml-build: Add aml_else() term

[Igor Mammedov <imammedo@redhat.com>]

On Tue, 14 Apr 2015 14:38:18 +0800
Shannon Zhao <zhaoshenglong@huawei.com> wrote:

> On 2015/4/14 13:56, Michael S. Tsirkin wrote:
> > On Mon, Apr 13, 2015 at 04:55:13PM +0100, Alex Bennée wrote:
> >>
> >> Shannon Zhao <zhaoshenglong@huawei.com> writes:
> >>
> >>> From: Shannon Zhao <shannon.zhao@linaro.org>
> >>>
> >>> Signed-off-by: Shannon Zhao <zhaoshenglong@huawei.com>
> >>> Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
> >>
> >> I was considering if the magic numbers should be defined somewhere
> >> but I guess that is the point of the stub functions.
> > 
> > I don't think so: wrappers make sure each is used
> > only once.  enums would just obfuscate code.
> > comments are better in that they match the language
> > used in the acpi spec, exactly.
> > 
> 
> I think this has nothing to do with the Opcode used once or other.
> Maybe the Opcodes should be defined at one place, then have a whole
> scope of the Opcodes and drop the magic numbers.
I agree with Michael,
With one off usage, It's easier to read code with magic numbers and
comments, without having to jump around to find out what define or enum
equals.
 
> 
> >> Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
> > 
> >>
> >>> ---
> >>>  hw/acpi/aml-build.c         | 7 +++++++
> >>>  include/hw/acpi/aml-build.h | 1 +
> >>>  2 files changed, 8 insertions(+)
> >>>
> >>> diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
> >>> index 4f936f7..9b8b422 100644
> >>> --- a/hw/acpi/aml-build.c
> >>> +++ b/hw/acpi/aml-build.c
> >>> @@ -626,6 +626,13 @@ Aml *aml_if(Aml *predicate)
> >>>      return var;
> >>>  }
> >>>  
> >>> +/* ACPI 1.0: 16.2.3 Operators: DefElse */
> >>> +Aml *aml_else(void)
> >>> +{
> >>> +    Aml *var = aml_bundle(0xA1 /* ElseOp */, AML_PACKAGE);
> >>> +    return var;
> >>> +}
> >>> +
> >>>  /* ACPI 1.0b: 16.2.5.2 Named Objects Encoding: DefMethod */
> >>>  Aml *aml_method(const char *name, int arg_count)
> >>>  {
> >>> diff --git a/include/hw/acpi/aml-build.h
> >>> b/include/hw/acpi/aml-build.h index 6b407d5..3901515 100644
> >>> --- a/include/hw/acpi/aml-build.h
> >>> +++ b/include/hw/acpi/aml-build.h
> >>> @@ -206,6 +206,7 @@ Aml *aml_scope(const char *name_format, ...)
> >>> GCC_FMT_ATTR(1, 2); Aml *aml_device(const char *name_format, ...)
> >>> GCC_FMT_ATTR(1, 2); Aml *aml_method(const char *name, int
> >>> arg_count); Aml *aml_if(Aml *predicate);
> >>> +Aml *aml_else(void);
> >>>  Aml *aml_package(uint8_t num_elements);
> >>>  Aml *aml_buffer(void);
> >>>  Aml *aml_resource_template(void);
> >>
> >> -- 
> >> Alex Bennée
> > 
> > 
> > .
> > 
> 
> 
>