# -*clang- Python -*-

import os
import platform
import re
import subprocess

import lit.formats
import lit.util

# Configuration file for the 'lit' test runner.

# name: The name of this test suite.
config.name = 'Polly'

# 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.
execute_external = platform.system() != 'Windows'
config.test_format = lit.formats.ShTest(execute_external)

# suffixes: A list of file extensions to treat as test files.
config.suffixes = ['.ll']

# test_source_root: The root path where tests are located.
config.test_source_root = os.path.dirname(__file__)

# test_exec_root: The root path where tests should be run.
polly_obj_root = getattr(config, 'polly_obj_root', None)
if polly_obj_root is not None:
    config.test_exec_root = os.path.join(polly_obj_root, 'test')

# Set llvm_{src,obj}_root for use by others.
config.llvm_src_root = getattr(config, 'llvm_src_root', None)
config.llvm_obj_root = getattr(config, 'llvm_obj_root', None)

# Tweak the PATH to include the tools dir and the scripts dir.
if polly_obj_root is not None:
    llvm_tools_dir = getattr(config, 'llvm_tools_dir', None)
    if not llvm_tools_dir:
        lit_config.fatal('No LLVM tools dir set!')
    extra_paths = getattr(config, 'extra_paths', [])
    base_paths = [llvm_tools_dir, config.environment['PATH']]
    path = os.path.pathsep.join(base_paths + extra_paths)
    config.environment['PATH'] = path

    llvm_libs_dir = getattr(config, 'llvm_libs_dir', None)
    if not llvm_libs_dir:
        lit_config.fatal('No LLVM libs dir set!')
    path = os.path.pathsep.join((llvm_libs_dir,
                                 config.environment.get('LD_LIBRARY_PATH','')))
    config.environment['LD_LIBRARY_PATH'] = path

###

# Check that the object root is known.
if config.test_exec_root is None:
    # Otherwise, we haven't loaded the site specific configuration (the user is
    # probably trying to run on a test file directly, and either the site
    # configuration hasn't been created by the build system, or we are in an
    # out-of-tree build situation).

    # Check for 'polly_site_config' user parameter, and use that if available.
    site_cfg = lit_config.params.get('polly_site_config', None)
    if site_cfg and os.path.exists(site_cfg):
        lit_config.load_config(config, site_cfg)
        raise SystemExit

    # Try to detect the situation where we are using an out-of-tree build by
    # looking for 'llvm-config'.
    #
    # FIXME: I debated (i.e., wrote and threw away) adding logic to
    # automagically generate the lit.site.cfg if we are in some kind of fresh
    # build situation. This means knowing how to invoke the build system though,
    # and I decided it was too much magic. We should solve this by just having
    # the .cfg files generated during the configuration step.

    llvm_config = lit.util.which('llvm-config', config.environment['PATH'])
    if not llvm_config:
        lit_config.fatal('No site specific configuration available!')

    # Get the source and object roots.
    llvm_src_root = subprocess.check_output(['llvm-config', '--src-root']).decode("utf-8").strip()
    llvm_obj_root = subprocess.check_output(['llvm-config', '--obj-root']).decode("utf-8").strip()

    polly_src_root = os.path.join(llvm_src_root, "tools", "polly")
    polly_obj_root = os.path.join(llvm_obj_root, "tools", "polly")

    # Validate that we got a tree which points to here, using the standard
    # tools/polly layout.
    this_src_root = os.path.dirname(config.test_source_root)
    if os.path.realpath(polly_src_root) != os.path.realpath(this_src_root):
        lit_config.fatal('No site specific configuration available!')

    # Check that the site specific configuration exists.
    site_cfg = os.path.join(polly_obj_root, 'test', 'lit.site.cfg')
    if not os.path.exists(site_cfg):
        lit_config.fatal('No site specific configuration available!')

    # Okay, that worked. Notify the user of the automagic, and reconfigure.
    lit_config.note('using out-of-tree build at %r' % polly_obj_root)
    lit_config.load_config(config, site_cfg)
    raise SystemExit

# opt knows whether it is compiled with -DNDEBUG.
import subprocess
try:
    opt_cmd = subprocess.Popen([os.path.join(llvm_tools_dir, 'opt'), '-version'],
                           stdout = subprocess.PIPE,
                           env=config.environment)
except OSError:
    print("Could not find opt in " + llvm_tools_dir)
    exit(42)

if re.search(r'with assertions', opt_cmd.stdout.read().decode('ascii')):
    config.available_features.add('asserts')
opt_cmd.wait()

try:
    llvm_config_cmd = subprocess.Popen([os.path.join(llvm_tools_dir,
                                                     'llvm-config'),
                                        '--targets-built'],
                                       stdout = subprocess.PIPE,
                                       env=config.environment)
except OSError:
    print("Could not find llvm-config in " + llvm_tools_dir)
    exit(42)

if re.search(r'NVPTX', llvm_config_cmd.stdout.read().decode('ascii')):
    config.available_features.add('nvptx-registered-target')
llvm_config_cmd.wait()