# -*- Python -*-

import os

def get_required_attr(config, attr_name):
  attr_value = getattr(config, attr_name, None)
  if not attr_value:
    lit_config.fatal(
      "No attribute %r in test configuration! You may need to run "
      "tests from your build directory or add this attribute "
      "to lit.site.cfg " % attr_name)
  return attr_value

# Setup config name.
config.name = 'AddressSanitizer' + config.name_suffix

# Setup source root.
config.test_source_root = os.path.dirname(__file__)

# GCC-ASan doesn't link in all the necessary libraries automatically, so
# we have to do it ourselves.
if config.compiler_id == 'GNU':
  extra_linkflags = ["-lpthread", "-lstdc++", "-ldl"]
else:
  extra_linkflags = []
# Setup default compiler flags used with -fsanitize=address option.
# FIXME: Review the set of required flags and check if it can be reduced.
target_cflags = [get_required_attr(config, "target_cflags")] + extra_linkflags
target_cxxflags = config.cxx_mode_flags + target_cflags
clang_asan_cflags = ["-fsanitize=address",
                     "-mno-omit-leaf-frame-pointer",
                     "-fno-omit-frame-pointer",
                     "-fno-optimize-sibling-calls",
                     "-g"] + target_cflags
clang_asan_cxxflags = config.cxx_mode_flags + clang_asan_cflags

asan_lit_source_dir = get_required_attr(config, "asan_lit_source_dir")
if config.android == "TRUE":
  config.available_features.add('android')
  clang_wrapper = os.path.join(asan_lit_source_dir,
                               "android_commands", "android_compile.py") + " "
else:
  clang_wrapper = ""

def build_invocation(compile_flags):
  return " " + " ".join([clang_wrapper, config.clang] + compile_flags) + " "

config.substitutions.append( ("%clang ", build_invocation(target_cflags)) )
config.substitutions.append( ("%clangxx ", build_invocation(target_cxxflags)) )
config.substitutions.append( ("%clang_asan ", build_invocation(clang_asan_cflags)) )
config.substitutions.append( ("%clangxx_asan ", build_invocation(clang_asan_cxxflags)) )

# FIXME: De-hardcode this path.
asan_source_dir = os.path.join(
  get_required_attr(config, "compiler_rt_src_root"), "lib", "asan")
# Setup path to asan_symbolize.py script.
asan_symbolize = os.path.join(asan_source_dir, "scripts", "asan_symbolize.py")
if not os.path.exists(asan_symbolize):
  lit_config.fatal("Can't find script on path %r" % asan_symbolize)
python_exec = get_required_attr(config, "python_executable")
config.substitutions.append( ("%asan_symbolize", python_exec + " " + asan_symbolize + " ") )

# Determine kernel bitness
if config.host_arch.find('64') != -1 and config.android != "TRUE":
  kernel_bits = '64'
else:
  kernel_bits = '32'

# Define CHECK-%os to check for OS-dependent output.
config.substitutions.append( ('CHECK-%os', ("CHECK-" + config.host_os)))
config.substitutions.append( ('CHECK-%kernel_bits', ("CHECK-kernel-" + kernel_bits + "-bits")))

config.available_features.add("asan-" + config.bits + "-bits")

# Turn on leak detection on 64-bit Linux.
if config.host_os == 'Linux' and config.bits == '64':
  config.environment['ASAN_OPTIONS'] = 'detect_leaks=1'

# GCC-ASan uses dynamic runtime by default, so we have to set LD_LIBRARY_PATH
# to pick it up properly.
if config.compiler_id == 'GNU':
  gcc_dir = os.path.dirname(config.clang)
  libasan_dir = os.path.join(gcc_dir, "..", "lib" + config.bits)
  new_ld_library_path = os.path.pathsep.join(
    (libasan_dir, config.environment['LD_LIBRARY_PATH']))
  config.environment['LD_LIBRARY_PATH'] = new_ld_library_path

# Default test suffixes.
config.suffixes = ['.c', '.cc', '.cpp']

if config.host_os == 'Darwin':
  config.suffixes.append('.mm')

# AddressSanitizer tests are currently supported on Linux and Darwin only.
if config.host_os not in ['Linux', 'Darwin']:
  config.unsupported = True