# -*- Python -*-

import os
import platform
import re
import subprocess
import sys

import lit.formats
import lit.util

from lit.llvm import llvm_config
from lit.llvm.subst import ToolSubst
from lit.llvm.subst import FindTool

# Configuration file for the 'lit' test runner.

# name: The name of this test suite.
config.name = "Flang"

# TODO: Consolidate the logic for turning on the internal shell by default for all LLVM test suites.
# See https://github.com/llvm/llvm-project/issues/106636 for more details.
#
# We prefer the lit internal shell which provides a better user experience on failures
# and is faster unless the user explicitly disables it with LIT_USE_INTERNAL_SHELL=0
# env var.
use_lit_shell = True
lit_shell_env = os.environ.get("LIT_USE_INTERNAL_SHELL")
if lit_shell_env:
    use_lit_shell = lit.util.pythonize_bool(lit_shell_env)

# 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=not use_lit_shell)

# suffixes: A list of file extensions to treat as test files.
config.suffixes = [
    ".c",
    ".cpp",
    ".f",
    ".F",
    ".ff",
    ".FOR",
    ".for",
    ".f77",
    ".f90",
    ".F90",
    ".ff90",
    ".f95",
    ".F95",
    ".ff95",
    ".fpp",
    ".FPP",
    ".cuf",
    ".CUF",
    ".f18",
    ".F18",
    ".f03",
    ".F03",
    ".f08",
    ".F08",
    ".ll",
    ".fir",
    ".mlir",
]

config.substitutions.append(("%PATH%", config.environment["PATH"]))
config.substitutions.append(("%llvmshlibdir", config.llvm_shlib_dir))
config.substitutions.append(("%pluginext", config.llvm_plugin_ext))

llvm_config.use_default_substitutions()

# ask llvm-config about asserts
llvm_config.feature_config([("--assertion-mode", {"ON": "asserts"})])

# Targets
config.targets = frozenset(config.targets_to_build.split())
for arch in config.targets_to_build.split():
    config.available_features.add(arch.lower() + "-registered-target")

# To modify the default target triple for flang tests.
if config.flang_test_triple:
    config.target_triple = config.flang_test_triple
    config.environment[config.llvm_target_triple_env] = config.flang_test_triple

# excludes: A list of directories to exclude from the testsuite. The 'Inputs'
# subdirectories contain auxiliary inputs for various tests in their parent
# directories.
config.excludes = ["Inputs", "CMakeLists.txt", "README.txt", "LICENSE.txt"]

# If the flang examples are built, add examples to the config
if config.flang_examples:
    config.available_features.add("examples")

# Plugins (loadable modules)
if config.has_plugins:
    config.available_features.add("plugins")

if config.linked_bye_extension:
    config.substitutions.append(("%loadbye", ""))
else:
    config.substitutions.append(
        (
            "%loadbye",
            "-fpass-plugin={}/Bye{}".format(
                config.llvm_shlib_dir, config.llvm_plugin_ext
            ),
        )
    )

# 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.
config.test_exec_root = os.path.join(config.flang_obj_root, "test")

# Tweak the PATH to include the tools dir.
llvm_config.with_environment("PATH", config.flang_tools_dir, append_path=True)
llvm_config.with_environment("PATH", config.llvm_tools_dir, append_path=True)

if config.flang_standalone_build:
    # For builds with FIR, set path for tco and enable related tests
    if config.flang_llvm_tools_dir != "":
        config.available_features.add("fir")
        if config.llvm_tools_dir != config.flang_llvm_tools_dir:
            llvm_config.with_environment(
                "PATH", config.flang_llvm_tools_dir, append_path=True
            )

# On MacOS, some tests need -isysroot to build binaries.
isysroot_flag = []
if config.osx_sysroot:
    isysroot_flag = ["-isysroot", config.osx_sysroot]
config.substitutions.append(("%isysroot", " ".join(isysroot_flag)))

# Check for DEFAULT_SYSROOT, because when it is set -isysroot has no effect.
if config.default_sysroot:
    config.available_features.add("default_sysroot")

# For each occurrence of a flang tool name, replace it with the full path to
# the build directory holding that tool.
tools = [
    ToolSubst(
        "%flang",
        command=FindTool("flang"),
        unresolved="fatal",
    ),
    ToolSubst(
        "%flang_fc1",
        command=FindTool("flang"),
        extra_args=["-fc1"],
        unresolved="fatal",
    ),
]

# Flang has several unimplemented features. TODO messages are used to mark
# and fail if these features are exercised. Some TODOs exit with a non-zero
# exit code, but others abort the execution in assert builds.
# To catch aborts, the `--crash` option for the `not` command has to be used.
tools.append(ToolSubst("%not_todo_cmd", command=FindTool("not"), unresolved="fatal"))
if "asserts" in config.available_features:
    tools.append(
        ToolSubst(
            "%not_todo_abort_cmd",
            command=FindTool("not"),
            extra_args=["--crash"],
            unresolved="fatal",
        )
    )
else:
    tools.append(
        ToolSubst("%not_todo_abort_cmd", command=FindTool("not"), unresolved="fatal")
    )

# Add all the tools and their substitutions (if applicable). Use the search paths provided for
# finding the tools.
if config.flang_standalone_build:
    llvm_config.add_tool_substitutions(
        tools, [config.flang_llvm_tools_dir, config.llvm_tools_dir]
    )
else:
    llvm_config.add_tool_substitutions(tools, config.llvm_tools_dir)

llvm_config.use_clang(required=False)

# Clang may need the include path for ISO_fortran_binding.h.
config.substitutions.append(("%flang_include", config.flang_headers_dir))

# Enable libpgmath testing
result = lit_config.params.get("LIBPGMATH")
if result:
    config.environment["LIBPGMATH"] = True

# Determine if OpenMP runtime was built (enable OpenMP tests via REQUIRES in test file)
openmp_flags_substitution = "-fopenmp"
if config.have_openmp_rtl:
    config.available_features.add("openmp_runtime")
    # For the enabled OpenMP tests, add a substitution that is needed in the tests to find
    # the omp_lib.{h,mod} files, depending on whether the OpenMP runtime was built as a
    # project or runtime.
    if config.openmp_module_dir:
        openmp_flags_substitution += f" -J {config.openmp_module_dir}"
config.substitutions.append(("%openmp_flags", openmp_flags_substitution))

# Add features and substitutions to test F128 math support.
# %f128-lib substitution may be used to generate check prefixes
# for LIT tests checking for F128 library support.
if config.flang_runtime_f128_math_lib or config.have_ldbl_mant_dig_113:
    config.available_features.add("flang-supports-f128-math")
if config.flang_runtime_f128_math_lib:
    config.available_features.add(
        "flang-f128-math-lib-" + config.flang_runtime_f128_math_lib
    )
    config.substitutions.append(
        ("%f128-lib", config.flang_runtime_f128_math_lib.upper())
    )
else:
    config.substitutions.append(("%f128-lib", "NONE"))