# vim: set filetype=python:

import re

# Testsuite configuration setup for GHC
#
# This file is Python source
#
config.compiler_always_flags = ghc_compiler_always_flags.split()

# By default, the 'normal' way is enabled. In addition, certain
# ways are enabled automatically if this GHC supports them. Ways that fall in
# this group are 'hpc', 'optasm', 'optllvm', 'profasm', 'threaded1', 'threaded2',
# 'profthreaded', 'ghci', and whichever of 'static/dyn' is not this GHC's
# default mode. Other ways should be set explicitly from .T files.
config.compile_ways       = ['normal']
config.run_ways           = ['normal']

# ways that are not enabled by default, but can always be invoked explicitly
config.other_ways         = ['hpc',
                             'prof', 'normal_h',
                             'prof_hc_hb','prof_hb',
                             'prof_hd','prof_hy','prof_hr',
                             'sanity',
                             'threaded1_ls', 'threaded2_hT', 'threaded2_sanity', 'debug_numa',
                             'llvm', 'debugllvm',
                             'profllvm', 'profoptllvm', 'profthreadedllvm',
                             'debug',
                             'ghci-ext', 'ghci-ext-prof',
                             'ext-interp',
                             'nonmoving',
                             'nonmoving_thr',
                             'nonmoving_thr_sanity',
                             'nonmoving_thr_ghc',
                             'compacting_gc',
                             ]


if ghc_with_native_codegen:
    config.compile_ways.append('optasm')
    config.run_ways.append('optasm')

if config.have_interp:
    config.run_ways.append('ghci')

# we read the 'Support SMP' setting from the ghcconfig file. This dictates
# whether the target supports smp
if config.ghc_with_threaded_rts:
    config.run_ways.append('threaded1')
    if target_with_smp:
        config.target_has_smp = True
        config.run_ways.append('threaded2')
        if config.speed == 0:
            config.run_ways.append('nonmoving_thr')
            config.run_ways.append('nonmoving_thr_sanity')

if ghc_with_dynamic_rts:
    config.supports_dynamic_libs = True
    config.run_ways.append('dyn')

if windows:
    config.supports_dynamic_hs = False

# WinIO I/O manager for Windows
if windows:
    winio_ways = ['winio', 'winio_threaded']
    if config.speed == 0:
        config.run_ways += winio_ways
    else:
        config.other_ways += winio_ways

# LLVM
if not config.unregisterised and not config.arch in {"wasm32", "javascript"} and config.have_llvm:
    config.compile_ways.append('optllvm')
    config.run_ways.append('optllvm')

# HPC
if not config.arch == "javascript":
    config.compile_ways.append('hpc')
    config.run_ways.append('hpc')

if config.arch == "wasm32":
    config.have_process = False
    config.supports_dynamic_libs = False

config.way_flags = {
    'normal'       : [],
    'normal_h'     : [],
    'g1'           : [],
    'nursery_chunks' : [],
    'debug_numa'   : ['-threaded', '-debug'],
    'optasm'       : ['-O', '-fasm'],
    'llvm'         : ['-fllvm'],
    'optllvm'      : ['-O', '-fllvm'],
    'debugllvm'    : ['-fllvm', '-keep-llvm-files'],
    'prof'         : ['-prof', '-static', '-fprof-auto', '-fasm'],
    'prof_no_auto' : ['-prof', '-static', '-fasm'],
    'profasm'      : ['-O', '-prof', '-static', '-fprof-auto'],
    'profthreaded' : ['-O', '-prof', '-static', '-fprof-auto', '-threaded'],
    'ghci'         : ['--interactive', '-v0', '-ignore-dot-ghci', '-fno-ghci-history', '+RTS', '-I0.1', '-RTS'] + (['-fghci-leak-check'] if not config.compiler_debugged else []),
    'sanity'       : ['-debug'],
    'threaded1'    : ['-threaded', '-debug'],
    'threaded1_ls' : ['-threaded', '-debug'],
    'threaded2'    : ['-O', '-threaded'],
    'threaded2_hT' : ['-O', '-threaded'],
    'threaded2_sanity': ['-O', '-threaded', '-debug'],
    'hpc'          : ['-O', '-fhpc'],
    'prof_hc_hb'   : ['-O', '-prof', '-static', '-fprof-auto'],
    'prof_hb'      : ['-O', '-prof', '-static', '-fprof-auto'],
    'prof_hd'      : ['-O', '-prof', '-static', '-fprof-auto'],
    'prof_hy'      : ['-O', '-prof', '-static', '-fprof-auto'],
    'prof_hr'      : ['-O', '-prof', '-static', '-fprof-auto'],
    'dyn'          : ['-O', '-dynamic'],
    'static'       : ['-O', '-static'],
    'debug'        : ['-O', '-g', '-dannot-lint'],
    # llvm variants...
    'profllvm'         : ['-prof', '-static', '-fprof-auto', '-fllvm'],
    'profoptllvm'      : ['-O', '-prof', '-static', '-fprof-auto', '-fllvm'],
    'profthreadedllvm' : ['-O', '-prof', '-static', '-fprof-auto', '-threaded', '-fllvm'],
    'ghci-ext'         : ['--interactive', '-v0', '-ignore-dot-ghci', '-fno-ghci-history', '-fexternal-interpreter', '+RTS', '-I0.1', '-RTS'],
    'ghci-ext-prof'    : ['--interactive', '-v0', '-ignore-dot-ghci', '-fno-ghci-history', '-fexternal-interpreter', '-prof', '+RTS', '-I0.1', '-RTS'],
    'ext-interp'   : ['-fexternal-interpreter'],
    'nonmoving'    : [],
    'nonmoving_thr': ['-threaded'],
    'nonmoving_thr_sanity': ['-threaded', '-debug'],
    'nonmoving_thr_ghc': ['+RTS', '-xn', '-N2', '-RTS', '-threaded'],
    'compacting_gc': [],
    'winio': [],
    'winio_threaded': ['-threaded'],
   }

config.way_rts_flags = {
    'normal'       : [],
    'normal_h'     : ['-hT'], # works without -prof
    'g1'           : ['-G1'],
    'nursery_chunks' : ['-n32k'],
    'debug_numa'   : ['-N2', '--debug-numa=2'],
    'optasm'       : [],
    'llvm'         : [],
    'optllvm'      : [],
    'debugllvm'    : [],
    'prof'         : ['-p'],
    'prof_no_auto' : ['-p'],
    'profasm'      : ['-hc', '-p'], # test heap profiling too
    'profthreaded' : ['-p'],
    'ghci'         : [],
    'sanity'       : ['-DS'],
    'threaded1'    : [],
    'threaded1_ls' : ['-ls'],
    'threaded2'    : ['-N2', '-ls'],
    'threaded2_hT' : ['-N2', '-hT'],
    'threaded2_sanity' : ['-N2', '-DS'],
    'hpc'          : [],
    'prof_hc_hb'   : ['-hc', '-hbvoid'],
    'prof_hb'      : ['-hb'],
    'prof_hd'      : ['-hd'],
    'prof_hy'      : ['-hy'],
    'prof_hr'      : ['-hr'],
    'dyn'          : [],
    'static'       : [],
    'debug'        : [],
    # llvm variants...
    'profllvm'         : ['-p'],
    'profoptllvm'      : ['-hc', '-p'],
    'profthreadedllvm' : ['-p'],
    'ghci-ext'         : [],
    'ghci-ext-prof'    : [],
    'ext-interp'       : [],
    'nonmoving'        : ['-xn'],
    'nonmoving_thr'    : ['-xn', '-N2'],
    'nonmoving_thr_sanity'    : ['-xn', '-N2', '-DS'],
    'nonmoving_thr_ghc': ['-xn', '-N2'],
    'compacting_gc': ['-c'],
    'winio': ['--io-manager=native'],
    'winio_threaded': ['--io-manager=native'],
   }

# Useful classes of ways that can be used with only_ways(), omit_ways() and
# expect_broken_for().

prof_ways     = [x[0] for x in config.way_flags.items()
                      if '-prof' in x[1]]

debug_ways     = [x[0] for x in config.way_flags.items()
                      if '-debug' in x[1]]

threaded_ways = [x[0] for x in config.way_flags.items()
                      if '-threaded' in x[1] or 'ghci' == x[0]]

# Ways which run with multiple capabilities
concurrent_ways = [name for name, flags in config.way_flags.items()
                        if '-threaded' in flags or 'ghci' == name
                        if '-N2' in config.way_rts_flags.get(name, [])]

opt_ways      = [x[0] for x in config.way_flags.items()
                      if '-O' in x[1]]

llvm_ways     = [x[0] for x in config.way_flags.items()
                      if '-fllvm' in x[1]]

def get_compiler_info():

    # Whether GHC itself was built using the LLVM backend. We need to know this
    # since some tests in ext-interp fail when stage2 ghc is built using
    # LLVM. See #16087.
    #
    # The condition here is a bit approximate: we assume that if stage2 doesn't
    # have the NCG and isn't unregisterised then it must be using the LLVM
    # backend by default.
    config.ghc_built_by_llvm = not config.have_ncg and not config.unregisterised

    # external interpreter needs RTS linker support
    # If the field is not present (GHC 8.0 and earlier), assume we don't
    # have -fexternal-interpreter (though GHC 8.0 actually does)
    # so we can still run most tests.
    config.have_ext_interp = config.have_RTS_linker

    # See Note [Replacing backward slashes in config.libdir].
    config.libdir = config.libdir.replace('\\', '/')

    def test_compile(flags):
        """
        Check whether GHC can compile in the given way. This is used as a
        proxy to determine, e.g., whether profiled libraries were built, or
        whether the host RTS supports smp.
        """
        import tempfile
        import textwrap

        res = False

        with tempfile.TemporaryDirectory() as d:
            src = Path(d) / 'test.hs'
            src.write_text(textwrap.dedent('''
                module Main where
                main = putStrLn "Hello World!"
            '''))
            try:
                p = subprocess.run(
                    '{} -v0 {} -o test '.format(config.compiler, src) + ' '.join(flags),
                    shell=True,
                    cwd=d,
                    stderr=None if config.verbose >= 3 else subprocess.DEVNULL
                    )

            except Exception as err:
                print("Exception thrown in testsuite/config/ghc.get_compiler_info: %s", err)

            else:
                res = p.returncode == 0

        return res

    def compiler_supports_way(flags):
        return test_compile(flags)

    # Test the Host RTS to determine if it supports SMP. For cross compilers the
    # Host /= Target, so we cannot determine from the ghcconfig file if the host
    # itself supports smp. To support smp the host must be linked with an RTS
    # built with 'defined(THREADED_RTS) && !defined(NO_SMP)'. Thus we directly
    # query the RTS the host is linked with.
    config.ghc_has_smp    = test_compile(["+RTS", "-N"])

    config.have_vanilla   = compiler_supports_way([])
    config.have_dynamic   = compiler_supports_way(['-dynamic'])
    config.have_profiling = compiler_supports_way(['-prof'])

    if config.have_profiling:
        config.compile_ways.append('profasm')
        config.run_ways.append('profasm')

    if config.have_profiling and config.ghc_with_threaded_rts:
        config.run_ways.append('profthreaded')
        ghc_env['HAVE_PROFILING'] = 'YES'

    # See Note [WayFlags]
    if config.ghc_dynamic:
        config.ghc_th_way_flags = "-dynamic"
        config.ghci_way_flags   = "-dynamic"
        config.plugin_way_flags = "-dynamic"
        config.ghc_th_way       = "dyn"
    elif config.compiler_profiled:
        config.ghc_th_way_flags = "-prof"
        config.ghci_way_flags   = "-prof"
        config.plugin_way_flags = "-prof"
        config.ghc_th_way       = "prof"
    else:
        config.ghc_th_way_flags = "-static"
        config.ghci_way_flags   = "-static"
        config.plugin_way_flags = "-static"
        config.ghc_th_way       = "normal"

# Note [Replacing backward slashes in config.libdir]
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#
# We *do* need to replace backslashes in config.libdir, for the following
# reason:
#
# * Tests use config.libdir as follows:
#
#     extra_run_opts('"' + config.libdir + '"')
#
#   The double quotes are there because config.libdir might contain
#   spaces.
#
# * This string is then written /as is/ to <testname>.genscript in
#   testlib.interpreter_run:
#
#     script.write(':set args ' + opts.extra_run_opts + '\n')
#
# * But GHCi expects the arguments to ':set args' to be proper Haskell
#   strings (when they are quoted), with backslashes escaped. Since
#   config.libdir contains single backslash characters, tests such as T5313
#   will fail for WAY=ghci with "Pattern match failure in do expression".
#
# Arguably the above code for writing `:set args` should be smarter. This
# is tricky to get right though, because in GHCI `:set args foo\bar` (no
# double quotes) works perfectly fine, and is interpreted as the Haskell
# string "foo\\bar". Therefore, simply escaping all backward slashes in
# opts.extra_run_opts before concatenating it with ':set args' is not right
# either.
#
# Replacing backslashes to forward slashes in config.libdir works around the
# problem.