import lit.formats
import sys
import os

config.name = "libFuzzer" + config.name_suffix
config.test_format = lit.formats.ShTest(True)
config.suffixes = ['.test']
config.test_source_root = os.path.dirname(__file__)

# Choose between lit's internal shell pipeline runner and a real shell.  If
# LIT_USE_INTERNAL_SHELL is in the environment, we use that as an override.
use_lit_shell = os.environ.get("LIT_USE_INTERNAL_SHELL")
if use_lit_shell:
    # 0 is external, "" is default, and everything else is internal.
    execute_external = (use_lit_shell == "0")
else:
    # Otherwise we default to internal on Windows and external elsewhere, as
    # bash on Windows is usually very slow.
    execute_external = (not sys.platform in ['win32'])

# testFormat: The test format to use to interpret tests.
#
# For now we require '&&' between commands, until they get globally killed and
# the test runner updated.
config.test_format = lit.formats.ShTest(execute_external)

# LeakSanitizer is not supported on OSX or Windows right now.
if (sys.platform.startswith('darwin') or
    sys.platform.startswith('freebsd') or
    sys.platform.startswith('netbsd') or
    sys.platform.startswith('win')):
  lit_config.note('lsan feature unavailable')
else:
  lit_config.note('lsan feature available')
  config.available_features.add('lsan')

# MemorySanitizer is not supported on OSX or Windows right now
if sys.platform.startswith('darwin') or sys.platform.startswith('win'):
  lit_config.note('msan feature unavailable')
  assert 'msan' not in config.available_features
else:
  lit_config.note('msan feature available')
  config.available_features.add('msan')

if sys.platform.startswith('win') or sys.platform.startswith('cygwin'):
  config.available_features.add('windows')

if sys.platform.startswith('darwin'):
  config.available_features.add('darwin')

if sys.platform.startswith('linux'):
  # Note the value of ``sys.platform`` is not consistent
  # between python 2 and 3, hence the use of ``.startswith()``.
  lit_config.note('linux feature available')
  config.available_features.add('linux')
else:
  lit_config.note('linux feature unavailable')

config.substitutions.append(('%build_dir', config.cmake_binary_dir))
libfuzzer_src_root = os.path.join(config.compiler_rt_src_root, "lib", "fuzzer")
config.substitutions.append(('%libfuzzer_src', libfuzzer_src_root))

def generate_compiler_cmd(is_cpp=True, fuzzer_enabled=True, msan_enabled=False):
  compiler_cmd = config.clang
  extra_cmd = config.target_flags
  if config.clang and config.stdlib == 'libc++':
    link_cmd = '-stdlib=libc++ -Wl,-rpath=%s' % config.runtime_library_dir
  elif config.clang and config.stdlib == 'static-libc++':
    link_cmd = '-stdlib=libc++ -lc++abi -static-libstdc++ -Wl,-rpath=%s' % (
        config.runtime_library_dir)
  elif any(x in config.target_triple for x in ('darwin', 'freebsd')):
    link_cmd = '-lc++'
  elif 'windows-msvc' in config.target_triple:
    link_cmd = ''
  else:
    link_cmd = '-lstdc++'

  if is_cpp and 'windows-msvc' in config.target_triple:
    std_cmd = '--driver-mode=cl'
  elif is_cpp:
    std_cmd = '--driver-mode=g++ -std=c++11'
  else:
    std_cmd = ''

  if msan_enabled:
    sanitizers = ['memory']
  else:
    sanitizers = ['address']
  if fuzzer_enabled:
    sanitizers.append('fuzzer')
  sanitizers_cmd = ('-fsanitize=%s' % ','.join(sanitizers))
  return " ".join([
    compiler_cmd,
    std_cmd,
    link_cmd,
    "-O2 -gline-tables-only",
    sanitizers_cmd,
    "-I%s" % libfuzzer_src_root,
    extra_cmd
  ])

config.substitutions.append(('%cpp_compiler',
      generate_compiler_cmd(is_cpp=True, fuzzer_enabled=True)
      ))

config.substitutions.append(('%c_compiler',
      generate_compiler_cmd(is_cpp=False, fuzzer_enabled=True)
      ))

config.substitutions.append(('%no_fuzzer_cpp_compiler',
      generate_compiler_cmd(is_cpp=True, fuzzer_enabled=False)
      ))

config.substitutions.append(('%no_fuzzer_c_compiler',
      generate_compiler_cmd(is_cpp=False, fuzzer_enabled=False)
      ))

config.substitutions.append(('%msan_compiler',
      generate_compiler_cmd(is_cpp=True, fuzzer_enabled=True, msan_enabled=True)
      ))

if config.host_os == 'Darwin':
  if config.target_arch in ["x86_64", "x86_64h"]:
    config.parallelism_group = "darwin-64bit-sanitizer"
  elif config.apple_platform != "osx" and not config.apple_platform.endswith("sim"):
    config.parallelism_group = "darwin-ios-device-sanitizer"