Hello
May I know why we do not support L"String" ?

My understanding is that L'String' is a string without NULL terminator, 
L"String" is a string with NULL terminator, right?

Thank you
Yao Jiewen

> -----Original Message-----
> From: edk2-devel [mailto:edk2-devel-boun...@lists.01.org] On Behalf Of Feng,
> YunhuaX
> Sent: Friday, February 2, 2018 5:02 PM
> To: edk2-devel@lists.01.org
> Cc: Gao, Liming <liming....@intel.com>
> Subject: [edk2] [PATCH] BaseTools: Update Expression.py for VOID* support L'a'
> and 'a'
> 
> Type VOID* support L'a' and 'a', the value transfer to c style value.
> L'a' --> {0x61, 0x00}
> L'ab' --> {0x61, 0x00, 0x62, 0x00}
> 'a'  --> {0x61}
> 'ab' --> {0x61, 0x62}
> 
> when the value is L'' or '', will report error
> 
> Cc: Liming Gao <liming....@intel.com>
> Cc: Yonghong Zhu <yonghong....@intel.com>
> Contributed-under: TianoCore Contribution Agreement 1.1
> Signed-off-by: Yunhua Feng <yunhuax.f...@intel.com>
> ---
>  BaseTools/Source/Python/Common/Expression.py | 19 ++++++++++++++++---
>  BaseTools/Source/Python/Common/Misc.py       |  4 ++++
>  2 files changed, 20 insertions(+), 3 deletions(-)
> 
> diff --git a/BaseTools/Source/Python/Common/Expression.py
> b/BaseTools/Source/Python/Common/Expression.py
> index b8c48460ff..6a1103df2c 100644
> --- a/BaseTools/Source/Python/Common/Expression.py
> +++ b/BaseTools/Source/Python/Common/Expression.py
> @@ -740,7 +740,12 @@ class ValueExpressionEx(ValueExpression):
>          try:
>              PcdValue = ValueExpression.__call__(self, RealValue, Depth)
>              if self.PcdType == 'VOID*' and (PcdValue.startswith("'") or
> PcdValue.startswith("L'")):
> -                raise BadExpression
> +                PcdValue, Size = ParseFieldValue(PcdValue)
> +                PcdValueList = []
> +                for I in range(Size):
> +                    PcdValueList.append('0x%02X'%(PcdValue & 0xff))
> +                    PcdValue = PcdValue >> 8
> +                PcdValue = '{' + ','.join(PcdValueList) + '}'
>              elif self.PcdType in ['UINT8', 'UINT16', 'UINT32', 'UINT64',
> 'BOOLEAN'] and (PcdValue.startswith("'") or \
>                        PcdValue.startswith('"') or PcdValue.startswith("L'")
> or PcdValue.startswith('L"') or PcdValue.startswith('{')):
>                  raise BadExpression
> @@ -755,6 +760,8 @@ class ValueExpressionEx(ValueExpression):
>                      TmpValue = 0
>                      Size = 0
>                      for Item in PcdValue:
> +                        if Item.startswith('UINT8'):
> +                            ItemSize = 1
>                          if Item.startswith('UINT16'):
>                              ItemSize = 2
>                          elif Item.startswith('UINT32'):
> @@ -776,7 +783,10 @@ class ValueExpressionEx(ValueExpression):
>                          TmpValue = (ItemValue << (Size * 8)) | TmpValue
>                          Size = Size + ItemSize
>                  else:
> -                    TmpValue, Size = ParseFieldValue(PcdValue)
> +                    try:
> +                        TmpValue, Size = ParseFieldValue(PcdValue)
> +                    except BadExpression:
> +                        raise BadExpression("Type: %s, Value: %s, format
> or value error" % (self.PcdType, PcdValue))
>                  if type(TmpValue) == type(''):
>                      TmpValue = int(TmpValue)
>                  else:
> @@ -858,7 +868,7 @@ class ValueExpressionEx(ValueExpression):
>                                      else:
>                                          raise BadExpression('%s not
> defined before use' % Offset)
>                                  ValueType = ""
> -                                if Item.startswith('UINT16'):
> +                                if Item.startswith('UINT8'):
>                                      ItemSize = 1
>                                      ValueType = "UINT8"
>                                  elif Item.startswith('UINT16'):
> @@ -887,6 +897,9 @@ class ValueExpressionEx(ValueExpression):
> 
>                              if Size > 0:
>                                  PcdValue = '{' + ValueStr[:-2] + '}'
> +                    else:
> +                        raise  BadExpression("Type: %s, Value: %s, format
> or value error"%(self.PcdType, PcdValue))
> +
>          if PcdValue == 'True':
>              PcdValue = '1'
>          if PcdValue == 'False':
> diff --git a/BaseTools/Source/Python/Common/Misc.py
> b/BaseTools/Source/Python/Common/Misc.py
> index b34cb4c3be..d80f645d2e 100644
> --- a/BaseTools/Source/Python/Common/Misc.py
> +++ b/BaseTools/Source/Python/Common/Misc.py
> @@ -1572,6 +1572,8 @@ def ParseFieldValue (Value):
>      if Value.startswith("L'") and Value.endswith("'"):
>          # Unicode Character Constant
>          List = list(Value[2:-1])
> +        if len(List) == 0:
> +            raise BadExpression('Length %s is %s' % (Value, len(List)))
>          List.reverse()
>          Value = 0
>          for Char in List:
> @@ -1580,6 +1582,8 @@ def ParseFieldValue (Value):
>      if Value.startswith("'") and Value.endswith("'"):
>          # Character constant
>          List = list(Value[1:-1])
> +        if len(List) == 0:
> +            raise BadExpression('Length %s is %s' % (Value, len(List)))
>          List.reverse()
>          Value = 0
>          for Char in List:
> --
> 2.12.2.windows.2
> 
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