# -*- 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.py " % attr_name
        )
    return attr_value


# Setup config name.
config.name = "ThreadSanitizer" + config.name_suffix

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

# Setup environment variables for running ThreadSanitizer.
default_tsan_opts = "atexit_sleep_ms=0"

if config.host_os == "Darwin":
    # On Darwin, we default to `abort_on_error=1`, which would make tests run
    # much slower. Let's override this and run lit tests with 'abort_on_error=0'.
    default_tsan_opts += ":abort_on_error=0"
    # On Darwin, we default to ignore_noninstrumented_modules=1, which also
    # suppresses some races the tests are supposed to find. Let's run without this
    # setting, but turn it back on for Darwin tests (see Darwin/lit.local.cfg.py).
    default_tsan_opts += ":ignore_noninstrumented_modules=0"
    default_tsan_opts += ":ignore_interceptors_accesses=0"

# Platform-specific default TSAN_OPTIONS for lit tests.
if default_tsan_opts:
    config.environment["TSAN_OPTIONS"] = default_tsan_opts
    default_tsan_opts += ":"
config.substitutions.append(
    ("%env_tsan_opts=", "env TSAN_OPTIONS=" + default_tsan_opts)
)

# GCC driver doesn't add necessary compile/link flags with -fsanitize=thread.
if config.compiler_id == "GNU":
    extra_cflags = ["-fPIE", "-pthread", "-ldl", "-lrt", "-pie"]
else:
    extra_cflags = []

tsan_incdir = config.test_source_root + "/../"
# Setup default compiler flags used with -fsanitize=thread option.
clang_tsan_cflags = (
    ["-fsanitize=thread", "-Wall"]
    + [config.target_cflags]
    + config.debug_info_flags
    + extra_cflags
    + ["-I%s" % tsan_incdir]
)
clang_tsan_cxxflags = (
    config.cxx_mode_flags + clang_tsan_cflags + ["-std=c++11"] + ["-I%s" % tsan_incdir]
)
# Add additional flags if we're using instrumented libc++.
# Instrumented libcxx currently not supported on Darwin.
if config.has_libcxx and config.host_os != "Darwin":
    # FIXME: Dehardcode this path somehow.
    libcxx_path = os.path.join(
        config.compiler_rt_obj_root,
        "lib",
        "tsan",
        "libcxx_tsan_%s" % config.target_arch,
    )
    libcxx_incdir = os.path.join(libcxx_path, "include", "c++", "v1")
    libcxx_libdir = os.path.join(libcxx_path, "lib")
    libcxx_a = os.path.join(libcxx_libdir, "libc++.a")
    clang_tsan_cxxflags += ["-nostdinc++", "-I%s" % libcxx_incdir]
    config.substitutions.append(("%link_libcxx_tsan", libcxx_a))
else:
    config.substitutions.append(("%link_libcxx_tsan", ""))


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


config.substitutions.append(("%clang_tsan ", build_invocation(clang_tsan_cflags)))
config.substitutions.append(("%clangxx_tsan ", build_invocation(clang_tsan_cxxflags)))

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

config.substitutions.append(
    (
        "%deflake ",
        os.path.join(os.path.dirname(__file__), "deflake.bash")
        + " "
        + config.deflake_threshold
        + " ",
    )
)

# Default test suffixes.
config.suffixes = [".c", ".cpp", ".m", ".mm"]

if config.host_os not in ["FreeBSD", "Linux", "Darwin", "NetBSD"]:
    config.unsupported = True

if config.android:
    config.unsupported = True

if not config.parallelism_group:
    config.parallelism_group = "shadow-memory"

if config.host_os == "NetBSD":
    config.substitutions.insert(0, ("%run", config.netbsd_noaslr_prefix))