import lit.formats
import sys
import os

config.name = "LLVMFuzzer"
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 right now.
if sys.platform.startswith('darwin'):
  lit_config.note('lsan feature unavailable')
else:
  lit_config.note('lsan feature available')
  config.available_features.add('lsan')

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):
  compiler_cmd = config.c_compiler
  link_cmd = '-lc++' if 'darwin' in config.target_triple else '-lstdc++'
  std_cmd = '-std=c++11' if is_cpp else ''
  sanitizers = ['address']
  if fuzzer_enabled:
    sanitizers.append('fuzzer')
  sanitizers_cmd = ('-fsanitize=%s' % ','.join(sanitizers))
  isysroot_cmd = config.osx_sysroot_flag if config.osx_sysroot_flag else ''
  include_cmd = '-I%s' % libfuzzer_src_root
  return '%s %s %s -gline-tables-only %s %s %s' % (
      compiler_cmd, std_cmd, link_cmd, isysroot_cmd, sanitizers_cmd, include_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)
      ))