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"""Flexible enumeration of C types."""
from Enumeration import *
# TODO:
# - struct improvements (flexible arrays, packed &
# unpacked, alignment)
# - objective-c qualified id
# - anonymous / transparent unions
# - VLAs
# - block types
# - K&R functions
# - pass arguments of different types (test extension, transparent union)
# - varargs
###
# Actual type types
class Type:
def isBitField(self):
return False
def isPaddingBitField(self):
return False
class BuiltinType(Type):
def __init__(self, name, size, bitFieldSize=None):
self.name = name
self.size = size
self.bitFieldSize = bitFieldSize
def isBitField(self):
return self.bitFieldSize is not None
def isPaddingBitField(self):
return self.bitFieldSize is 0
def getBitFieldSize(self):
assert self.isBitField()
return self.bitFieldSize
def sizeof(self):
return self.size
def __str__(self):
return self.name
class RecordType(Type):
def __init__(self, index, isUnion, fields):
self.index = index
self.isUnion = isUnion
self.fields = fields
self.name = None
def __str__(self):
def getField(t):
if t.isBitField():
return "%s : %d;" % (t, t.getBitFieldSize())
else:
return "%s;" % t
return '%s { %s }'%(('struct','union')[self.isUnion],
' '.join(map(getField, self.fields)))
def getTypedefDef(self, name, printer):
def getField((i, t)):
if t.isBitField():
if t.isPaddingBitField():
return '%s : 0;'%(printer.getTypeName(t),)
else:
return '%s field%d : %d;'%(printer.getTypeName(t),i,
t.getBitFieldSize())
else:
return '%s field%d;'%(printer.getTypeName(t),i)
fields = map(getField, enumerate(self.fields))
# Name the struct for more readable LLVM IR.
return 'typedef %s %s { %s } %s;'%(('struct','union')[self.isUnion],
name, ' '.join(fields), name)
class ArrayType(Type):
def __init__(self, index, isVector, elementType, size):
if isVector:
# Note that for vectors, this is the size in bytes.
assert size > 0
else:
assert size is None or size >= 0
self.index = index
self.isVector = isVector
self.elementType = elementType
self.size = size
if isVector:
eltSize = self.elementType.sizeof()
assert not (self.size % eltSize)
self.numElements = self.size // eltSize
else:
self.numElements = self.size
def __str__(self):
if self.isVector:
return 'vector (%s)[%d]'%(self.elementType,self.size)
elif self.size is not None:
return '(%s)[%d]'%(self.elementType,self.size)
else:
return '(%s)[]'%(self.elementType,)
def getTypedefDef(self, name, printer):
elementName = printer.getTypeName(self.elementType)
if self.isVector:
return 'typedef %s %s __attribute__ ((vector_size (%d)));'%(elementName,
name,
self.size)
else:
if self.size is None:
sizeStr = ''
else:
sizeStr = str(self.size)
return 'typedef %s %s[%s];'%(elementName, name, sizeStr)
class ComplexType(Type):
def __init__(self, index, elementType):
self.index = index
self.elementType = elementType
def __str__(self):
return '_Complex (%s)'%(self.elementType)
def getTypedefDef(self, name, printer):
return 'typedef _Complex %s %s;'%(printer.getTypeName(self.elementType), name)
class FunctionType(Type):
def __init__(self, index, returnType, argTypes):
self.index = index
self.returnType = returnType
self.argTypes = argTypes
def __str__(self):
if self.returnType is None:
rt = 'void'
else:
rt = str(self.returnType)
if not self.argTypes:
at = 'void'
else:
at = ', '.join(map(str, self.argTypes))
return '%s (*)(%s)'%(rt, at)
def getTypedefDef(self, name, printer):
if self.returnType is None:
rt = 'void'
else:
rt = str(self.returnType)
if not self.argTypes:
at = 'void'
else:
at = ', '.join(map(str, self.argTypes))
return 'typedef %s (*%s)(%s);'%(rt, name, at)
###
# Type enumerators
class TypeGenerator(object):
def __init__(self):
self.cache = {}
def setCardinality(self):
abstract
def get(self, N):
T = self.cache.get(N)
if T is None:
assert 0 <= N < self.cardinality
T = self.cache[N] = self.generateType(N)
return T
def generateType(self, N):
abstract
class FixedTypeGenerator(TypeGenerator):
def __init__(self, types):
TypeGenerator.__init__(self)
self.types = types
self.setCardinality()
def setCardinality(self):
self.cardinality = len(self.types)
def generateType(self, N):
return self.types[N]
class ComplexTypeGenerator(TypeGenerator):
def __init__(self, typeGen):
TypeGenerator.__init__(self)
self.typeGen = typeGen
self.setCardinality()
def setCardinality(self):
self.cardinality = self.typeGen.cardinality
def generateType(self, N):
return ComplexType(N, self.typeGen.get(N))
class VectorTypeGenerator(TypeGenerator):
def __init__(self, typeGen, sizes):
TypeGenerator.__init__(self)
self.typeGen = typeGen
self.sizes = tuple(map(int,sizes))
self.setCardinality()
def setCardinality(self):
self.cardinality = len(self.sizes)*self.typeGen.cardinality
def generateType(self, N):
S,T = getNthPairBounded(N, len(self.sizes), self.typeGen.cardinality)
return ArrayType(N, True, self.typeGen.get(T), self.sizes[S])
class FixedArrayTypeGenerator(TypeGenerator):
def __init__(self, typeGen, sizes):
TypeGenerator.__init__(self)
self.typeGen = typeGen
self.sizes = tuple(size)
self.setCardinality()
def setCardinality(self):
self.cardinality = len(self.sizes)*self.typeGen.cardinality
def generateType(self, N):
S,T = getNthPairBounded(N, len(self.sizes), self.typeGen.cardinality)
return ArrayType(N, false, self.typeGen.get(T), self.sizes[S])
class ArrayTypeGenerator(TypeGenerator):
def __init__(self, typeGen, maxSize, useIncomplete=False, useZero=False):
TypeGenerator.__init__(self)
self.typeGen = typeGen
self.useIncomplete = useIncomplete
self.useZero = useZero
self.maxSize = int(maxSize)
self.W = useIncomplete + useZero + self.maxSize
self.setCardinality()
def setCardinality(self):
self.cardinality = self.W * self.typeGen.cardinality
def generateType(self, N):
S,T = getNthPairBounded(N, self.W, self.typeGen.cardinality)
if self.useIncomplete:
if S==0:
size = None
S = None
else:
S = S - 1
if S is not None:
if self.useZero:
size = S
else:
size = S + 1
return ArrayType(N, False, self.typeGen.get(T), size)
class RecordTypeGenerator(TypeGenerator):
def __init__(self, typeGen, useUnion, maxSize):
TypeGenerator.__init__(self)
self.typeGen = typeGen
self.useUnion = bool(useUnion)
self.maxSize = int(maxSize)
self.setCardinality()
def setCardinality(self):
M = 1 + self.useUnion
if self.maxSize is aleph0:
S = aleph0 * self.typeGen.cardinality
else:
S = 0
for i in range(self.maxSize+1):
S += M * (self.typeGen.cardinality ** i)
self.cardinality = S
def generateType(self, N):
isUnion,I = False,N
if self.useUnion:
isUnion,I = (I&1),I>>1
fields = map(self.typeGen.get,getNthTuple(I,self.maxSize,self.typeGen.cardinality))
return RecordType(N, isUnion, fields)
class FunctionTypeGenerator(TypeGenerator):
def __init__(self, typeGen, useReturn, maxSize):
TypeGenerator.__init__(self)
self.typeGen = typeGen
self.useReturn = useReturn
self.maxSize = maxSize
self.setCardinality()
def setCardinality(self):
if self.maxSize is aleph0:
S = aleph0 * self.typeGen.cardinality()
elif self.useReturn:
S = 0
for i in range(1,self.maxSize+1+1):
S += self.typeGen.cardinality ** i
else:
S = 0
for i in range(self.maxSize+1):
S += self.typeGen.cardinality ** i
self.cardinality = S
def generateType(self, N):
if self.useReturn:
# Skip the empty tuple
argIndices = getNthTuple(N+1, self.maxSize+1, self.typeGen.cardinality)
retIndex,argIndices = argIndices[0],argIndices[1:]
retTy = self.typeGen.get(retIndex)
else:
retTy = None
argIndices = getNthTuple(N, self.maxSize, self.typeGen.cardinality)
args = map(self.typeGen.get, argIndices)
return FunctionType(N, retTy, args)
class AnyTypeGenerator(TypeGenerator):
def __init__(self):
TypeGenerator.__init__(self)
self.generators = []
self.bounds = []
self.setCardinality()
self._cardinality = None
def getCardinality(self):
if self._cardinality is None:
return aleph0
else:
return self._cardinality
def setCardinality(self):
self.bounds = [g.cardinality for g in self.generators]
self._cardinality = sum(self.bounds)
cardinality = property(getCardinality, None)
def addGenerator(self, g):
self.generators.append(g)
for i in range(100):
prev = self._cardinality
self._cardinality = None
for g in self.generators:
g.setCardinality()
self.setCardinality()
if (self._cardinality is aleph0) or prev==self._cardinality:
break
else:
raise RuntimeError,"Infinite loop in setting cardinality"
def generateType(self, N):
index,M = getNthPairVariableBounds(N, self.bounds)
return self.generators[index].get(M)
def test():
fbtg = FixedTypeGenerator([BuiltinType('char', 4),
BuiltinType('char', 4, 0),
BuiltinType('int', 4, 5)])
fields1 = AnyTypeGenerator()
fields1.addGenerator( fbtg )
fields0 = AnyTypeGenerator()
fields0.addGenerator( fbtg )
# fields0.addGenerator( RecordTypeGenerator(fields1, False, 4) )
btg = FixedTypeGenerator([BuiltinType('char', 4),
BuiltinType('int', 4)])
atg = AnyTypeGenerator()
atg.addGenerator( btg )
atg.addGenerator( RecordTypeGenerator(fields0, False, 4) )
print 'Cardinality:',atg.cardinality
for i in range(100):
if i == atg.cardinality:
try:
atg.get(i)
raise RuntimeError,"Cardinality was wrong"
except AssertionError:
break
print '%4d: %s'%(i, atg.get(i))
if __name__ == '__main__':
test()
|