BaseTools: introduce !error statement

The DSC and FDF file can use `!error` statement. The argument of this
statement is an error message, it causes build tool to stop at the
location where the statement is encountered and error message following
the `!error` statement is output as a message.

Fixes: https://bugzilla.tianocore.org/show_bug.cgi?id=701
Cc: Liming Gao <liming.gao@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Yunhua Feng <yunhuax.feng@intel.com>
Reviewed-by: Yonghong Zhu <yonghong.zhu@intel.com>

BaseTools/Source/Python/Common/BuildToolError.py

@@ -89,6 +89,7 @@ PCD_VARIABLE_INFO_ERROR = 0xF016
 PCD_VARIABLE_ATTRIBUTES_CONFLICT_ERROR = 0xF013
 PCD_STRUCTURE_PCD_INVALID_FIELD_ERROR = 0xF014
 PCD_STRUCTURE_PCD_ERROR = 0xF015
+ERROR_STATEMENT = 0xFFFD
 ABORT_ERROR = 0xFFFE
 UNKNOWN_ERROR = 0xFFFF
 
@@ -151,6 +152,7 @@ gErrorMessage = {
     IO_TIMEOUT              :   "Timeout",
     IO_UNKNOWN_ERROR        :   "Unknown error in IO operation",
 
+    ERROR_STATEMENT         :   "!error statement",
     UNKNOWN_ERROR           :   "Unknown error",
 }
 

BaseTools/Source/Python/Common/DataType.py

@@ -471,7 +471,7 @@ TAB_ELSE = '!else'
 TAB_IF_DEF = '!ifdef'
 TAB_IF_N_DEF = '!ifndef'
 TAB_IF_EXIST = '!if exist'
-TAB_ERROR = '!ERROR'
+TAB_ERROR = '!error'
 
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