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language.py
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# Copyright 2014-2015 The Alive authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import collections
from constants import *
from codegen import *
def getAllocSize(type):
# round to nearest byte boundary
return int((type.getSize() + 7) / 8) * 8
def alignSize(size, align):
if align == 0:
return size
assert align & (align-1) == 0
return (size + (align-1)) & ~(align-1)
def getPtrAlignCnstr(ptr, align):
if align == 0:
return BoolVal(True)
assert align & (align-1) == 0
return ptr & (align-1) == 0
def defined_align_access(state, defined, access_size, req_align, aptr):
must_access = []
for blck in state.ptrs:
ptr = blck.ptr
size = blck.size()
inbounds = And(UGE(aptr, ptr), UGE((size - access_size)/8, aptr - ptr))
if req_align != 0 and size >= access_size:
# overestimating the alignment is undefined behavior.
defined.append(Implies(inbounds, blck.align >= req_align))
if access_size <= size:
must_access.append(inbounds if blck.isAlloca() else BoolVal(True))
defined.append(mk_or(must_access))
################################
class MemInfo:
def __init__(self, ptr, mem, qvars, ty, block_size, num_elems, align):
self.ptr = ptr
self.mem = mem
self.qvars = qvars
self.ty = ty
self.block_size = block_size
self.num_elems = num_elems
self.align = align
def isAlloca(self):
return self.ty == 'alloca'
def size(self):
return self.block_size * self.num_elems
def __eq__(self, b):
return self.ptr.eq(b.ptr)
class State:
def __init__(self):
self.vars = collections.OrderedDict()
self.defined = [] # definedness so far in the BB
self.ptrs = []
self.bb_pres = {}
self.bb_mem = {}
def add(self, v, smt, defined, poison, qvars):
if v.getUniqueName() == '':
return
self.vars[v.getUniqueName()] = (smt, self.defined + defined, poison, qvars)
if isinstance(v, TerminatorInst):
for (bb,cond) in v.getSuccessors(self):
bb = bb[1:]
if bb not in self.bb_pres:
self.bb_pres[bb] = []
self.bb_mem[bb] = []
self.bb_pres[bb] += [cond]
self.bb_mem[bb].append((cond, self.mem))
def addAlloca(self, ptr, mem, block_size, num_elems, align):
self.ptrs.append(MemInfo(ptr, mem, [mem], 'alloca', block_size, num_elems,
align))
def addInputMem(self, ptr, mem, qvars, block_size, num_elems):
# precondition vcgen can call this function spuriously
if any(ptr.eq(blck.ptr) for blck in self.ptrs):
return
self.ptrs.append(MemInfo(ptr, mem, qvars, 'in', block_size, num_elems, 1))
def newBB(self, name):
if name in self.bb_pres:
self.defined = [mk_or(self.bb_pres[name])]
self.mem = fold_ite_list(self.bb_mem[name])
else:
self.defined = []
self.mem = Array('mem0', BitVecSort(get_ptr_size()), BitVecSort(8))
self.current_bb = name
def getAllocaConstraints(self):
# generate the following constraints:
# 1) Alloca ptrs are never null
# 2) Allocated regions do not overlap with each other and with input blocks
cnstr = []
for mem1 in self.ptrs:
if mem1.ty == 'in':
continue
ptr = mem1.ptr
size = mem1.size()
cnstr.append(ptr != 0)
for mem2 in self.ptrs:
if mem1 == mem2:
continue
cnstr.append(Or(UGE(mem2.ptr, ptr + size),
ULE(mem2.ptr + mem2.size(), ptr)))
return cnstr
def eval(self, v, defined, poison, qvars):
(smt, d, p, q) = self.vars[v.getUniqueName()]
defined += d
poison += p
qvars += q
return smt
def iteritems(self):
for k,v in self.vars.iteritems():
if k[0] != '%' and k[0] != 'C' and not k.startswith('ret_'):
continue
yield k,v
def has_key(self, k):
return self.vars.has_key(k)
def __getitem__(self, k):
return self.vars[k]
################################
class Instr(Value):
pass
################################
class CopyOperand(Instr):
def __init__(self, v, type):
self.v = v
self.type = type
assert isinstance(self.v, Value)
assert isinstance(self.type, Type)
def __repr__(self):
t = str(self.type)
if len(t) > 0:
t += ' '
return t + self.v.getName()
def toSMT(self, defined, poison, state, qvars):
return state.eval(self.v, defined, poison, qvars)
def getTypeConstraints(self):
return And(self.type == self.v.type,
self.type.getTypeConstraints())
def register_types(self, manager):
manager.register_type(self, self.type, UnknownType())
manager.unify(self, self.v)
# TODO: visit_source?
def visit_target(self, manager, use_builder=False):
instr = manager.get_cexp(self.v)
if use_builder:
isntr = CVariable('Builder').arr('Insert', [instr])
# TODO: this probably should use manager.get_ctype,
# but that currently doesn't distinguish source instructions (Value)
# from target instructions (Instruction)
if isinstance(self.v, Instr):
ctype = manager.PtrInstruction
else:
ctype = manager.PtrValue
return [CDefinition.init(
ctype,
manager.get_cexp(self),
instr)]
################################
class BinOp(Instr):
Add, Sub, Mul, UDiv, SDiv, URem, SRem, Shl, AShr, LShr, And, Or, Xor,\
Last = range(14)
opnames = {
Add: 'add',
Sub: 'sub',
Mul: 'mul',
UDiv: 'udiv',
SDiv: 'sdiv',
URem: 'urem',
SRem: 'srem',
Shl: 'shl',
AShr: 'ashr',
LShr: 'lshr',
And: 'and',
Or: 'or',
Xor: 'xor',
}
opids = {v:k for k, v in opnames.items()}
def __init__(self, op, type, v1, v2, flags = []):
assert isinstance(type, Type)
assert isinstance(v1, Value)
assert isinstance(v2, Value)
assert 0 <= op < self.Last
self.op = op
self.type = type
self.v1 = v1
self.v2 = v2
self.flags = list(flags)
self._check_op_flags()
def getOpName(self):
return self.opnames[self.op]
@staticmethod
def getOpId(name):
try:
return BinOp.opids[name]
except:
raise ParseError('Unknown binary instruction')
def __repr__(self):
t = str(self.type)
if len(t) > 0:
t = ' ' + t
flags = ' '.join(self.flags)
if len(flags) > 0:
flags = ' ' + flags
return '%s%s%s %s, %s' % (self.getOpName(), flags, t,
self.v1.getName(),
self.v2.getName())
def _check_op_flags(self):
allowed_flags = {
self.Add: ['nsw', 'nuw'],
self.Sub: ['nsw', 'nuw'],
self.Mul: ['nsw', 'nuw'],
self.UDiv: ['exact'],
self.SDiv: ['exact'],
self.URem: [],
self.SRem: [],
self.Shl: ['nsw', 'nuw'],
self.AShr: ['exact'],
self.LShr: ['exact'],
self.And: [],
self.Or: [],
self.Xor: [],
}[self.op]
for f in self.flags:
if f not in allowed_flags:
raise ParseError('Flag not supported by ' + self.getOpName(), f)
def _genSMTDefConds(self, v1, v2, poison):
bits = self.type.getSize()
poison_conds = {
self.Add: {'nsw': lambda a,b: SignExt(1,a)+SignExt(1,b) == SignExt(1,a+b),
'nuw': lambda a,b: ZeroExt(1,a)+ZeroExt(1,b) == ZeroExt(1,a+b),
},
self.Sub: {'nsw': lambda a,b: SignExt(1,a)-SignExt(1,b) == SignExt(1,a-b),
'nuw': lambda a,b: ZeroExt(1,a)-ZeroExt(1,b) == ZeroExt(1,a-b),
},
self.Mul: {'nsw': lambda a,b: no_overflow_smul(a, b),
'nuw': lambda a,b: no_overflow_umul(a, b),
},
self.UDiv:{'exact': lambda a,b: UDiv(a, b) * b == a,
},
self.SDiv:{'exact': lambda a,b: (a / b) * b == a,
},
self.URem:{},
self.SRem:{},
self.Shl: {'nsw': lambda a,b: (a << b) >> b == a,
'nuw': lambda a,b: LShR(a << b, b) == a,
},
self.AShr:{'exact': lambda a,b: (a >> b) << b == a,
},
self.LShr:{'exact': lambda a,b: LShR(a, b) << b == a,
},
self.And: {},
self.Or: {},
self.Xor: {},
}[self.op]
if do_infer_flags():
for flag,fn in poison_conds.iteritems():
bit = get_flag_var(flag, self.getName())
poison += [Implies(bit == 1, fn(v1, v2))]
else:
for f in self.flags:
poison += [poison_conds[f](v1, v2)]
# definedness of the instruction
return {
self.Add: lambda a,b: [],
self.Sub: lambda a,b: [],
self.Mul: lambda a,b: [],
self.UDiv: lambda a,b: [b != 0],
self.SDiv: lambda a,b: [b != 0, Or(a != (1 << (bits-1)), b != -1)],
self.URem: lambda a,b: [b != 0],
self.SRem: lambda a,b: [b != 0, Or(a != (1 << (bits-1)), b != -1)],
self.Shl: lambda a,b: [ULT(b, bits)],
self.AShr: lambda a,b: [ULT(b, bits)],
self.LShr: lambda a,b: [ULT(b, bits)],
self.And: lambda a,b: [],
self.Or: lambda a,b: [],
self.Xor: lambda a,b: [],
}[self.op](v1,v2)
def toSMT(self, defined, poison, state, qvars):
v1 = state.eval(self.v1, defined, poison, qvars)
v2 = state.eval(self.v2, defined, poison, qvars)
defined += self._genSMTDefConds(v1, v2, poison)
return {
self.Add: lambda a,b: a + b,
self.Sub: lambda a,b: a - b,
self.Mul: lambda a,b: a * b,
self.UDiv: lambda a,b: UDiv(a, b),
self.SDiv: lambda a,b: a / b,
self.URem: lambda a,b: URem(a, b),
self.SRem: lambda a,b: SRem(a, b),
self.Shl: lambda a,b: a << b,
self.AShr: lambda a,b: a >> b,
self.LShr: lambda a,b: LShR(a, b),
self.And: lambda a,b: a & b,
self.Or: lambda a,b: a | b,
self.Xor: lambda a,b: a ^ b,
}[self.op](v1, v2)
def getTypeConstraints(self):
return And(self.type == self.v1.type,
self.type == self.v2.type,
self.type.getTypeConstraints())
caps = {
Add: 'Add',
Sub: 'Sub',
Mul: 'Mul',
UDiv: 'UDiv',
SDiv: 'SDiv',
URem: 'URem',
SRem: 'SRem',
Shl: 'Shl',
AShr: 'AShr',
LShr: 'LShr',
And: 'And',
Or: 'Or',
Xor: 'Xor',
}
def register_types(self, manager):
manager.register_type(self, self.type, IntType())
manager.unify(self, self.v1, self.v2)
def visit_source(self, mb):
r1 = mb.subpattern(self.v1)
r2 = mb.subpattern(self.v2)
op = BinOp.caps[self.op]
if 'nsw' in self.flags and 'nuw' in self.flags:
return CFunctionCall('match',
mb.get_my_ref(),
CFunctionCall('m_CombineAnd',
CFunctionCall('m_NSW' + op, r1, r2),
CFunctionCall('m_NUW' + op,
CFunctionCall('m_Value'),
CFunctionCall('m_Value'))))
if 'nsw' in self.flags:
return mb.simple_match('m_NSW' + op, r1, r2)
if 'nuw' in self.flags:
return mb.simple_match('m_NUW' + op, r1, r2)
if 'exact' in self.flags:
return CFunctionCall('match',
mb.get_my_ref(),
CFunctionCall('m_Exact', CFunctionCall('m_' + op, r1, r2)))
return mb.simple_match('m_' + op, r1, r2)
def visit_target(self, manager, use_builder=False):
cons = CFunctionCall('BinaryOperator::Create' + self.caps[self.op],
manager.get_cexp(self.v1), manager.get_cexp(self.v2))
if use_builder:
cons = CVariable('Builder').arr('Insert', [cons])
gen = [CDefinition.init(CPtrType(CTypeName('BinaryOperator')), manager.get_cexp(self), cons)]
for f in self.flags:
setter = {'nsw': 'setHasNoSignedWrap', 'nuw': 'setHasNoUnsignedWrap', 'exact': 'setIsExact'}[f]
gen.append(manager.get_cexp(self).arr(setter, [CVariable('true')]))
return gen
################################
class ConversionOp(Instr):
Trunc, ZExt, SExt, ZExtOrTrunc, Ptr2Int, Int2Ptr, Bitcast, Last = range(8)
opnames = {
Trunc: 'trunc',
ZExt: 'zext',
SExt: 'sext',
ZExtOrTrunc: 'ZExtOrTrunc',
Ptr2Int: 'ptrtoint',
Int2Ptr: 'inttoptr',
Bitcast: 'bitcast',
}
opids = {v:k for k, v in opnames.items()}
def __init__(self, op, stype, v, type):
assert isinstance(stype, Type)
assert isinstance(type, Type)
assert isinstance(v, Value)
assert 0 <= op < self.Last
self.op = op
self.stype = stype
self.v = v
self.type = type
def getOpName(self):
return self.opnames[self.op]
@staticmethod
def getOpId(name):
try:
return ConversionOp.opids[name]
except:
raise ParseError('Unknown conversion instruction')
@staticmethod
def enforceIntSrc(op):
return op == ConversionOp.Trunc or\
op == ConversionOp.ZExt or\
op == ConversionOp.SExt or\
op == ConversionOp.ZExtOrTrunc or\
op == ConversionOp.Int2Ptr
@staticmethod
def enforcePtrSrc(op):
return op == ConversionOp.Ptr2Int
@staticmethod
def enforceIntTgt(op):
return op == ConversionOp.Trunc or\
op == ConversionOp.ZExt or\
op == ConversionOp.SExt or\
op == ConversionOp.ZExtOrTrunc or\
op == ConversionOp.Ptr2Int
@staticmethod
def enforcePtrTgt(op):
return op == ConversionOp.Int2Ptr
def __repr__(self):
st = str(self.stype)
if len(st) > 0:
st = ' ' + st
tt = str(self.type)
if len(tt) > 0:
tt = ' to ' + tt
return '%s%s %s%s' % (self.getOpName(), st, self.v.getName(), tt)
def toSMT(self, defined, poison, state, qvars):
return {
self.Trunc: lambda v: Extract(self.type.getSize()-1, 0, v),
self.ZExt: lambda v: ZeroExt(self.type.getSize() -
self.stype.getSize(), v),
self.SExt: lambda v: SignExt(self.type.getSize() -
self.stype.getSize(), v),
self.ZExtOrTrunc: lambda v: truncateOrZExt(v, self.type.getSize()),
self.Ptr2Int: lambda v: truncateOrZExt(v, self.type.getSize()),
self.Int2Ptr: lambda v: truncateOrZExt(v, self.type.getSize()),
self.Bitcast: lambda v: v,
}[self.op](state.eval(self.v, defined, poison, qvars))
def getTypeConstraints(self):
cnstr = {
self.Trunc: lambda src,tgt: src > tgt,
self.ZExt: lambda src,tgt: src < tgt,
self.SExt: lambda src,tgt: src < tgt,
self.ZExtOrTrunc: lambda src,tgt: BoolVal(True),
self.Ptr2Int: lambda src,tgt: BoolVal(True),
self.Int2Ptr: lambda src,tgt: BoolVal(True),
self.Bitcast: lambda src,tgt: src.getSize() == tgt.getSize(),
} [self.op](self.stype, self.type)
return And(self.stype == self.v.type,
self.type.getTypeConstraints(),
self.stype.getTypeConstraints(),
cnstr)
matcher = {
Trunc: 'm_Trunc',
ZExt: 'm_ZExt',
SExt: 'm_SExt',
Ptr2Int: 'm_PtrToInt',
Bitcast: 'm_BitCast',
}
constr = {
Trunc: 'TruncInst',
ZExt: 'ZExtInst',
SExt: 'SExtInst',
Ptr2Int: 'PtrToIntInst',
Int2Ptr: 'IntToPtrInst',
Bitcast: 'BitCastInst',
}
def register_types(self, manager):
if self.enforceIntSrc(self.op):
manager.register_type(self.v, self.stype, IntType())
elif self.enforcePtrSrc(self.op):
manager.register_type(self.v, self.stype, PtrType())
else:
manager.register_type(self.v, self.stype, UnknownType())
if self.enforceIntTgt(self.op):
manager.register_type(self, self.type, IntType())
elif self.enforcePtrTgt(self.op):
manager.register_type(self, self.type, PtrType())
else:
manager.register_type(self, self.type, UnknownType())
# TODO: inequalities for trunc/sext/zext
def visit_source(self, mb):
r = mb.subpattern(self.v)
if self.op == ConversionOp.ZExtOrTrunc:
return CFunctionCall('match',
mb.get_my_ref(),
CFunctionCall('m_CombineOr',
CFunctionCall('m_ZExt', r),
CFunctionCall('m_ZTrunc', r)))
return mb.simple_match(ConversionOp.matcher[self.op], r)
def visit_target(self, manager, use_builder=False):
if self.op == ConversionOp.ZExtOrTrunc:
assert use_builder #TODO: handle ZExtOrTrunk in root position
instr = CVariable('Builder').arr('CreateZExtOrTrunc',
[manager.get_cexp(self.v), manager.get_llvm_type(self)])
return [CDefinition.init(
manager.PtrValue,
manager.get_cexp(self),
instr)]
else:
instr = CFunctionCall('new ' + ConversionOp.constr[self.op],
manager.get_cexp(self.v), manager.get_llvm_type(self))
if use_builder:
instr = CVariable('Builder').arr('Insert', [instr])
return [CDefinition.init(
manager.PtrInstruction,
manager.get_cexp(self),
instr)]
################################
class Icmp(Instr):
EQ, NE, UGT, UGE, ULT, ULE, SGT, SGE, SLT, SLE, Var, Last = range(12)
opnames = {
EQ: 'eq',
NE: 'ne',
UGT: 'ugt',
UGE: 'uge',
ULT: 'ult',
ULE: 'ule',
SGT: 'sgt',
SGE: 'sge',
SLT: 'slt',
SLE: 'sle',
}
opids = {v:k for k, v in opnames.items()}
def __init__(self, op, type, v1, v2):
assert isinstance(type, Type)
assert isinstance(v1, Value)
assert isinstance(v2, Value)
self.op = self.getOpId(op)
if self.op == self.Var:
self.opname = op
self.type = IntType(1)
self.stype = type.ensureIntPtrOrVector()
self.v1 = v1
self.v2 = v2
def getOpName(self):
return 'icmp'
@staticmethod
def getOpId(name):
return Icmp.opids.get(name, Icmp.Var)
def __repr__(self):
op = self.opname if self.op == Icmp.Var else Icmp.opnames[self.op]
if len(op) > 0:
op = ' ' + op
t = str(self.stype)
if len(t) > 0:
t = ' ' + t
return 'icmp%s%s %s, %s' % (op, t, self.v1.getName(), self.v2.getName())
def opToSMT(self, op, a, b):
return {
self.EQ: lambda a,b: toBV(a == b),
self.NE: lambda a,b: toBV(a != b),
self.UGT: lambda a,b: toBV(UGT(a, b)),
self.UGE: lambda a,b: toBV(UGE(a, b)),
self.ULT: lambda a,b: toBV(ULT(a, b)),
self.ULE: lambda a,b: toBV(ULE(a, b)),
self.SGT: lambda a,b: toBV(a > b),
self.SGE: lambda a,b: toBV(a >= b),
self.SLT: lambda a,b: toBV(a < b),
self.SLE: lambda a,b: toBV(a <= b),
}[op](a, b)
def recurseSMT(self, ops, a, b, i):
if len(ops) == 1:
return self.opToSMT(ops[0], a, b)
opname = self.opname if self.opname != '' else self.getName()
var = BitVec('icmp_' + opname, 4)
assert 1 << 4 > self.Var
return If(var == i,
self.opToSMT(ops[0], a, b),
self.recurseSMT(ops[1:], a, b, i+1))
def toSMT(self, defined, poison, state, qvars):
# Generate all possible comparisons if icmp is generic. Set of comparisons
# can be restricted in the precondition.
ops = [self.op] if self.op != self.Var else range(self.Var)
return self.recurseSMT(ops, state.eval(self.v1, defined, poison, qvars),
state.eval(self.v2, defined, poison, qvars), 0)
def getTypeConstraints(self):
return And(self.stype == self.v1.type,
self.stype == self.v2.type,
self.type.getTypeConstraints(),
self.stype.getTypeConstraints())
op_enum = {
EQ: 'ICmpInst::ICMP_EQ',
NE: 'ICmpInst::ICMP_NE',
UGT: 'ICmpInst::ICMP_UGT',
UGE: 'ICmpInst::ICMP_UGE',
ULT: 'ICmpInst::ICMP_ULT',
ULE: 'ICmpInst::ICMP_ULE',
SGT: 'ICmpInst::ICMP_SGT',
SGE: 'ICmpInst::ICMP_SGE',
SLT: 'ICmpInst::ICMP_SLT',
SLE: 'ICmpInst::ICMP_SLE',
}
def register_types(self, manager):
manager.register_type(self, self.type, IntType(1))
manager.register_type(self.v1, self.stype, UnknownType().ensureIntPtrOrVector())
manager.unify(self.v1, self.v2)
PredType = CTypeName('CmpInst::Predicate')
def visit_source(self, mb):
r1 = mb.subpattern(self.v1)
r2 = mb.subpattern(self.v2)
if self.op == Icmp.Var:
opname = self.opname if self.opname else 'Pred ' + self.name
name = mb.manager.get_key_name(opname) #FIXME: call via mb?
rp = mb.binding(name, self.PredType)
return mb.simple_match('m_ICmp', rp, r1, r2)
pvar = mb.new_name('P')
rp = mb.binding(pvar, self.PredType)
return CBinExpr('&&',
mb.simple_match('m_ICmp', rp, r1, r2),
CBinExpr('==', CVariable(pvar), CVariable(Icmp.op_enum[self.op])))
def visit_target(self, manager, use_builder=False):
# determine the predicate
if self.op == Icmp.Var:
key = self.opname if self.opname else 'Pred ' + self.name
opname = manager.get_key_name(key)
assert manager.bound(opname)
# TODO: confirm type
else:
opname = Icmp.op_enum[self.op]
instr = CFunctionCall('new ICmpInst', CVariable(opname),
manager.get_cexp(self.v1),
manager.get_cexp(self.v2))
if use_builder:
instr = CVariable('Builder').arr('Insert', [instr])
return [
CDefinition.init(manager.PtrInstruction, manager.get_cexp(self), instr)]
################################
class Select(Instr):
def __init__(self, type, c, v1, v2):
assert isinstance(type, Type)
assert isinstance(c, Value)
#assert isinstance(c.type, IntType)
assert isinstance(v1, Value)
assert isinstance(v2, Value)
self.type = type.ensureFirstClass()
self.c = c
self.v1 = v1
self.v2 = v2
def __repr__(self):
t = str(self.type)
if len(t) > 0:
t = t + ' '
return 'select i1 %s, %s%s, %s%s' % (self.c.getName(), t, self.v1.getName(),
t, self.v2.getName())
def getOpName(self):
return 'select'
def toSMT(self, defined, poison, state, qvars):
return If(state.eval(self.c, defined, poison, qvars) == 1,
state.eval(self.v1, defined, poison, qvars),
state.eval(self.v2, defined, poison, qvars))
def getTypeConstraints(self):
return And(self.type == self.v1.type,
self.type == self.v2.type,
self.c.type == 1,
self.type.getTypeConstraints())
def register_types(self, manager):
manager.register_type(self, self.type, UnknownType().ensureFirstClass())
manager.register_type(self.c, self.c.type, IntType(1))
manager.unify(self, self.v1, self.v2)
def visit_source(self, mb):
c = mb.subpattern(self.c)
v1 = mb.subpattern(self.v1)
v2 = mb.subpattern(self.v2)
return mb.simple_match('m_Select', c, v1, v2)
def visit_target(self, manager, use_builder=False):
instr = CFunctionCall('SelectInst::Create',
manager.get_cexp(self.c),
manager.get_cexp(self.v1),
manager.get_cexp(self.v2))
if use_builder:
instr = CVariable('Builder').arr('Insert', [instr])
return [CDefinition.init(manager.PtrInstruction, manager.get_cexp(self), instr)]
################################
class Alloca(Instr):
def __init__(self, type, elemsType, numElems, align):
assert isinstance(elemsType, IntType)
assert isinstance(align, int)
self.type = PtrType(type)
self.elemsType = elemsType
self.numElems = TypeFixedValue(numElems, 1, 16)
self.align = align
def __repr__(self):
elems = self.numElems.getName()
if elems == '1':
elems = ''
else:
t = str(self.elemsType)
if len(t) > 0:
t += ' '
elems = ', ' + t + elems
align = ', align %d' % self.align if self.align != 0 else ''
return 'alloca %s%s%s' % (str(self.type.type), elems, align)
def getOpName(self):
return 'alloca'
def toSMT(self, defined, poison, state, qvars):
self.numElems.toSMT(defined, poison, state, qvars)
ptr = BitVec(self.getName(), self.type.getSize())
block_size = getAllocSize(self.type.type)
num_elems = self.numElems.getValue()
size = num_elems * block_size
if size == 0:
qvars.append(ptr)
return ptr
if size > 8:
defined.append(ULT(ptr, ptr + ((size >> 3) - 1)))
defined += [ptr != 0,
getPtrAlignCnstr(ptr, self.align)]
mem = freshBV('alloca' + self.getName(), size)
state.addAlloca(ptr, mem, block_size, num_elems, self.align)
if use_array_theory():
for i in range(0, size/8):
idx = 8*i
state.mem = Update(state.mem, ptr + i, Extract(idx+7, idx, mem))
return ptr
def getTypeConstraints(self):
return And(self.numElems.getType() == self.elemsType,
self.type.getTypeConstraints(),
self.elemsType.getTypeConstraints(),
self.numElems.getTypeConstraints())
################################
class GEP(Instr):
def __init__(self, type, ptr, idxs, inbounds):
assert isinstance(type, PtrType)
assert isinstance(ptr, Value)
assert isinstance(idxs, list)
assert isinstance(inbounds, bool)
for i in range(len(idxs)):
assert isinstance(idxs[i], IntType if (i & 1) == 0 else Value)
self.type = type
self.ptr = ptr
self.idxs = idxs[1:len(idxs):2]
self.inbounds = inbounds
def __repr__(self):
inb = 'inbounds ' if self.inbounds else ''
idxs = ''
for i in range(len(self.idxs)):
t = str(self.idxs[i].type)
if len(t) > 0:
t += ' '
idxs += ', %s%s' % (t, self.idxs[i].getName())
return 'getelementptr %s%s %s%s' % (inb, self.type, self.ptr.getName(),
idxs)
def getOpName(self):
return 'getelementptr'
def toSMT(self, defined, poison, state, qvars):
ptr = state.eval(self.ptr, defined, poison, qvars)
type = self.type
for i in range(len(self.idxs)):
idx = truncateOrSExt(state.eval(self.idxs[i], defined, poison, qvars),ptr)
ptr += getAllocSize(type.getPointeeType())/8 * idx
if i + 1 != len(self.idxs):
type = type.getUnderlyingType()
# TODO: handle inbounds
return ptr
def getTypeConstraints(self):
return And(self.type.ensureTypeDepth(len(self.idxs)),
Instr.getTypeConstraints(self))
################################
class Load(Instr):
def __init__(self, stype, v, align):
assert isinstance(stype, PtrType)
assert isinstance(v, Value)
assert isinstance(align, int)
self.stype = stype
stype.type = stype.type.ensureFirstClass()
self.type = stype.type
self.v = v
self.align = align
def __repr__(self):
align = ', align %d' % self.align if self.align != 0 else ''
return 'load %s %s%s' % (str(self.stype), self.v.getName(), align)
def getOpName(self):
return 'load'
def extractBV(self, BV, offset, size):
old_size = BV.size()
BV = BV << offset
return Extract(old_size - 1, old_size - size, BV)
def _mkBVLoad(self, l, v, defined, qvars):
if len(l) == 0:
return None
blck = l[0]
mem = blck.mem
ptr = blck.ptr
size = blck.size()
read_size = self.type.getSize()
if size > read_size:
offset = truncateOrZExt((v - ptr) << 3, mem)
mem = self.extractBV(mem, offset, read_size)
elif size < read_size:
# undef behavior; skip this block
return self._mkBVLoad(l[1:], v, defined, mustload, qvars)
inbounds = And(UGE(v, ptr), UGE((size - read_size)/8, v - ptr))
qvars += blck.qvars
mem2 = self._mkBVLoad(l[1:], v, defined, qvars)
return mem if mem2 is None else If(inbounds, mem, mem2)
def _mkArrayLoad(self, state, ptr, sz, qvars):
for blck in state.ptrs:
qvars += blck.qvars
bytes = []
rem = sz % 8
if rem != 0:
sz = sz - rem
bytes = [Extract(rem-1, 0, state.mem[ptr])]
ptr += 1
for i in range(0, sz/8):
# FIXME: assumes little-endian
bytes = [state.mem[ptr + i]] + bytes
return mk_concat(bytes)
def toSMT(self, defined, poison, state, qvars):
v = state.eval(self.v, defined, poison, qvars)
defined.append(v != 0)
access_sz = getAllocSize(self.type)
defined_align_access(state, defined, access_sz, self.align, v)
if use_array_theory():
val = self._mkArrayLoad(state, v, self.type.getSize(), qvars)
else:
val = self._mkBVLoad(state.ptrs, v, defined, qvars)
if val is None:
defined.append(BoolVal(False))
return BitVecVal(0, self.type.getSize())
return val
def getTypeConstraints(self):
return And(self.stype == self.v.type,
self.type == self.v.type.getPointeeType(),
self.type.getTypeConstraints())
################################
class Store(Instr):
def __init__(self, stype, src, type, dst, align):
assert isinstance(stype, Type)
assert isinstance(src, Value)
assert isinstance(type, PtrType)
assert isinstance(dst, Value)
assert isinstance(align, int)
self.stype = stype.ensureFirstClass()
self.src = src
self.type = type
self.dst = dst
self.align = align
self.setName('store')
self.id = mk_unique_id()
self.type.setName(self.getUniqueName())
def getUniqueName(self):
return self.getName() + '_' + self.id
def getOpName(self):
return 'store'
def __repr__(self):
t = str(self.stype)