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import re

import util

def FilterKnownValgrindTestFailures(tests):
  rc, output = util.getstatusoutput('valgrind --version')

  if rc != 0:
    util.abort('Failed to get the Valgrind version.')

  version = re.search('^valgrind-([0-9]+)\.([0-9]+)\.([0-9]+)', output)

  if not version:
    util.abort('Failed to get the Valgrind version.')

  major = int(version.group(1))
  minor = int(version.group(2))

  if major > 3 or (major == 3 and minor > 10):
    return tests

  reason = "Valgrind versions before 3.11 have issues with fused multiply-add, " \
           "so disable the affected tests."
  known_valgrind_test_failures = {
    'AARCH64_SIM_fmadd_d',
    'AARCH64_SIM_fmadd_s',
    'AARCH64_SIM_fmla_2D',
    'AARCH64_SIM_fmla_2D_2D_D',
    'AARCH64_SIM_fmla_2S',
    'AARCH64_SIM_fmla_2S_2S_S',
    'AARCH64_SIM_fmla_4S',
    'AARCH64_SIM_fmla_4S_4S_S',
    'AARCH64_SIM_fmla_D_D_D',
    'AARCH64_SIM_fmls_2D',
    'AARCH64_SIM_fmls_2D_2D_D',
    'AARCH64_SIM_fmls_2S',
    'AARCH64_SIM_fmls_2S_2S_S',
    'AARCH64_SIM_fmls_4S',
    'AARCH64_SIM_fmls_4S_4S_S',
    'AARCH64_SIM_fmls_D_D_D',
    'AARCH64_SIM_fmsub_d',
    'AARCH64_SIM_fmsub_s',
    'AARCH64_SIM_fnmadd_d',
    'AARCH64_SIM_fnmadd_s',
    'AARCH64_SIM_fnmsub_d',
    'AARCH64_SIM_fnmsub_s',
    'AARCH64_SIM_frecps_2D',
    'AARCH64_SIM_frecps_D',
    'AARCH64_SIM_frsqrts_2D',
    'AARCH64_SIM_frsqrts_D'
  }

  filtered_list = filter(lambda x: x not in known_valgrind_test_failures, tests)
  return (filtered_list, len(tests) - len(filtered_list), reason)

def FilterKnownTestFailures(tests, **env):
  skipped = []
  if env.get('under_valgrind'):
    tests, n_tests_skipped, reason = FilterKnownValgrindTestFailures(tests)
    skipped.append( (n_tests_skipped, reason) )

  return (tests, skipped)