AppPkg/Applications/Python/Python-2.7.2/Tools/bgen/bgen/bgenStackBuffer.py

   1 """Buffers allocated on the stack."""
   2
   3
   4 from bgenBuffer import FixedInputBufferType, FixedOutputBufferType
   5
   6
   7 class StackOutputBufferType(FixedOutputBufferType):
   8
   9     """Fixed output buffer allocated on the stack -- passed as (buffer, size).
  10
  11     Instantiate with the buffer size as parameter.
  12     """
  13
  14     def passOutput(self, name):
  15         return "%s__out__, %s" % (name, self.size)
  16
  17
  18 class VarStackOutputBufferType(StackOutputBufferType):
  19
  20     """Output buffer allocated on the stack -- passed as (buffer, &size).
  21
  22     Instantiate with the buffer size as parameter.
  23     """
  24
  25     def getSizeDeclarations(self, name):
  26         return []
  27
  28     def getAuxDeclarations(self, name):
  29         return ["int %s__len__ = %s" % (name, self.size)]
  30
  31     def passOutput(self, name):
  32         return "%s__out__, &%s__len__" % (name, name)
  33
  34     def mkvalueArgs(self, name):
  35         return "%s__out__, (int)%s__len__" % (name, name)
  36
  37
  38 class VarVarStackOutputBufferType(VarStackOutputBufferType):
  39
  40     """Output buffer allocated on the stack -- passed as (buffer, size, &size).
  41
  42     Instantiate with the buffer size as parameter.
  43     """
  44
  45     def passOutput(self, name):
  46         return "%s__out__, %s__len__, &%s__len__" % (name, name, name)
  47
  48
  49 class ReturnVarStackOutputBufferType(VarStackOutputBufferType):
  50
  51     """Output buffer allocated on the stack -- passed as (buffer, size) -> size.
  52
  53     Instantiate with the buffer size as parameter.
  54     The function's return value is the size.
  55     (XXX Should have a way to suppress returning it separately, too.)
  56     """
  57
  58     def passOutput(self, name):
  59         return "%s__out__, %s__len__" % (name, name)
  60
  61     def mkvalueArgs(self, name):
  62         return "%s__out__, (int)_rv" % name