Re: [edk2-devel] 回复: [PATCH] BaseTools: Should always define PCD TOKEN value as Zero for static PCD

["Bob Feng" <bob.c.feng@intel.com>]

Hi Liming,

So the PCD TOKEN is still useful for static PCD. 

For the sentence of "AutoGen.h will not be changed when PCD is added or removed.", 
I think if a user adds or deletes a dynamic PCD, the AutoGen.h will still change. This patch need update the commit message.

For the code, I think it would be better to write "#define PcdTokenName EFI_PCD_INVALID_TOKEN_NUMBER" to AutoGen.h and add some comments about the usage of EFI_PCD_INVALID_TOKEN_NUMBER.
Currently, PlatformAutoGen.PcdTokenNumber() still calculate the PCD TOKEN for static PCDs. I think that logic can also be deleted.

Thanks,
Bob

-----Original Message-----
From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of gaoliming
Sent: Wednesday, December 16, 2020 10:10 AM
To: Feng, Bob C <bob.c.feng@intel.com>; 'Yunhua Feng' <fengyunhua@byosoft.com.cn>; devel@edk2.groups.io
Cc: Chen, Christine <yuwei.chen@intel.com>
Subject: [edk2-devel] 回复: [PATCH] BaseTools: Should always define PCD TOKEN value as Zero for static PCD

Bob:
  Yes. Token value is designed for Dynamic and DynamicEx PCD. It is not used for static PCD. I propose to use EFI_PCD_INVALID_TOKEN_NUMBER (0) for the static PCD token value. If so, the consumer code can base on PcdToken value to know whether this PCD is dynamic or not.

Thanks
Liming
> -----邮件原件-----
> 发件人: Feng, Bob C <bob.c.feng@intel.com>
> 发送时间: 2020年12月16日 9:26
> 收件人: Yunhua Feng <fengyunhua@byosoft.com.cn>; devel@edk2.groups.io
> 抄送: Liming Gao <gaoliming@byosoft.com.cn>; Chen, Christine 
> <yuwei.chen@intel.com>
> 主题: RE: [PATCH] BaseTools: Should always define PCD TOKEN value as 
> Zero for static PCD
> 
> Yunhua, if FixedAtBuild, PatchableInModule and FeatureFlag PCD don't 
> use PCD TOKEN, maybe it's better to remove "#define PcdTokenName TOKEN"
> statement for those static PCD from AutoGen.h.
> 
> Thanks,
> Bob
> 
> -----Original Message-----
> From: Yunhua Feng <fengyunhua@byosoft.com.cn>
> Sent: Wednesday, December 16, 2020 9:03 AM
> To: devel@edk2.groups.io
> Cc: Feng, Bob C <bob.c.feng@intel.com>; Liming Gao 
> <gaoliming@byosoft.com.cn>; Chen, Christine <yuwei.chen@intel.com>
> Subject: [PATCH] BaseTools: Should always define PCD TOKEN value as 
> Zero for static PCD
> 
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3120
> FixedAtBuild, PatchableInModule and FeatureFlag PCD don't use PCD TOKEN.
> Their PCD TOKEN value can always be zero. If so, AutoGen.h will not be 
> changed when PCD is added or removed.
> 
> Cc: Bob Feng <bob.c.feng@intel.com>
> Cc: Liming Gao <gaoliming@byosoft.com.cn>
> Cc: Yuwei Chen <yuwei.chen@intel.com>
> Signed-off-by: Yunhua Feng <fengyunhua@byosoft.com.cn>
> ---
>  BaseTools/Source/Python/AutoGen/GenC.py | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/BaseTools/Source/Python/AutoGen/GenC.py
> b/BaseTools/Source/Python/AutoGen/GenC.py
> index a2053d5485..ac561ba82e 100755
> --- a/BaseTools/Source/Python/AutoGen/GenC.py
> +++ b/BaseTools/Source/Python/AutoGen/GenC.py
> @@ -913,6 +913,8 @@ def CreateModulePcdCode(Info, AutoGenC, AutoGenH, 
> Pcd):
>                                  ExtraData="[%s]" % str(Info))
>          else:
>              TokenNumber = PcdTokenNumber[Pcd.TokenCName, 
> Pcd.TokenSpaceGuidCName]
> +        if Pcd.Type not in PCD_DYNAMIC_TYPE_SET:
> +            TokenNumber = 0
>          AutoGenH.Append('\n#define %s  %dU\n' % (PcdTokenName,
> TokenNumber))
> 
>      EdkLogger.debug(EdkLogger.DEBUG_3, "Creating code for " + 
> TokenCName + "." + Pcd.TokenSpaceGuidCName)
> --
> 2.27.0.windows.1
>