def testCfaChange(self):
parser = PushOrSubSpParser()
match = parser.GetBreakpadInstructionsRegex().search('.cfa: sp 4 +')
self.assertIsNotNone(match)
address_unwind, new_cfa_sp_offset = parser.ParseFromMatch(
address_offset=20, cfa_sp_offset=0, match=match)
self.assertEqual(4, new_cfa_sp_offset)
self.assertEqual(
AddressUnwind(
address_offset=20,
unwind_type=UnwindType.UPDATE_SP_AND_OR_POP_REGISTERS,
sp_offset=4,
registers=()), address_unwind)
def testRegistersOrdering(self):
parser = PushOrSubSpParser()
match = parser.GetBreakpadInstructionsRegex().search(
'r10: .cfa -8 + ^ r7: .cfa -4 + ^')
self.assertIsNotNone(match)
address_unwind, new_cfa_sp_offset = parser.ParseFromMatch(
address_offset=20, cfa_sp_offset=0, match=match)
self.assertEqual(0, new_cfa_sp_offset)
self.assertEqual(
AddressUnwind(
address_offset=20,
unwind_type=UnwindType.UPDATE_SP_AND_OR_POP_REGISTERS,
sp_offset=0,
registers=(7, 10)), address_unwind)
def testCfaAndRaAndRegistersChangePopAndSpUpdate(self):
parser = PushOrSubSpParser()
match = parser.GetBreakpadInstructionsRegex().search(
'.cfa: sp 16 + .ra: .cfa -4 + ^ r4: .cfa -12 + ^ r7: .cfa -8 + ^')
self.assertIsNotNone(match)
address_unwind, new_cfa_sp_offset = parser.ParseFromMatch(
address_offset=20, cfa_sp_offset=0, match=match)
self.assertEqual(16, new_cfa_sp_offset)
self.assertEqual(
AddressUnwind(
address_offset=20,
unwind_type=UnwindType.UPDATE_SP_AND_OR_POP_REGISTERS,
sp_offset=4,
registers=(4, 7, 14)), address_unwind)
def testPoppingCallerSaveRegisters(self):
"""Regression test for pop unwinds that encode caller-save registers.
Callee-save registers: r0 ~ r3.
"""
parser = PushOrSubSpParser()
match = parser.GetBreakpadInstructionsRegex().search(
'.cfa: sp 16 + .ra: .cfa -4 + ^ '
'r3: .cfa -16 + ^ r4: .cfa -12 + ^ r5: .cfa -8 + ^')
self.assertIsNotNone(match)
address_unwind, new_cfa_sp_offset = parser.ParseFromMatch(
address_offset=20, cfa_sp_offset=0, match=match)
self.assertEqual(16, new_cfa_sp_offset)
self.assertEqual(
AddressUnwind(
address_offset=20,
unwind_type=UnwindType.UPDATE_SP_AND_OR_POP_REGISTERS,
sp_offset=4,
registers=(4, 5, 14)), address_unwind)