# Copyright (c) 2012 ARM Limited
# All rights reserved
#
# The license below extends only to copyright in the software and shall
# not be construed as granting a license to any other intellectual
# property including but not limited to intellectual property relating
# to a hardware implementation of the functionality of the software
# licensed hereunder.  You may use the software subject to the license
# terms below provided that you ensure that this notice is replicated
# unmodified and in its entirety in all distributions of the software,
# modified or unmodified, in source code or in binary form.
#
# Copyright (c) 2006-2007 The Regents of The University of Michigan
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer;
# redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
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# neither the name of the copyright holders nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

import os
import sys
import re
import string

from os.path import join as joinpath
import os.path
import os

import m5


def skip_test(reason=""):
    """Signal that a test should be skipped and optionally print why.

    Keyword arguments:
      reason -- Reason why the test failed. Output is omitted if empty.
    """

    if reason:
        print(f"Skipping test: {reason}")
    sys.exit(2)


def has_sim_object(name):
    """Test if a SimObject exists in the simulator.

    Arguments:
      name -- Name of SimObject (string)

    Returns: True if the object exists, False otherwise.
    """

    try:
        cls = getattr(m5.objects, name)
        return issubclass(cls, m5.objects.SimObject)
    except AttributeError:
        return False


def require_sim_object(name, fatal=False):
    """Test if a SimObject exists and abort/skip test if not.

    Arguments:
      name -- Name of SimObject (string)

    Keyword arguments:
      fatal -- Set to True to indicate that the test should fail
               instead of being skipped.
    """

    if has_sim_object(name):
        return
    else:
        msg = f"Test requires the '{name}' SimObject."
        if fatal:
            m5.fatal(msg)
        else:
            skip_test(msg)


def require_file(path, fatal=False, mode=os.F_OK):
    """Test if a file exists and abort/skip test if not.

    Arguments:
      path -- File to test for.

    Keyword arguments:
      fatal -- Set to True to indicate that the test should fail
               instead of being skipped.
      modes -- Mode to test for, default to existence. See the
               Python documentation for os.access().
    """

    if os.access(path, mode):
        return
    else:
        msg = f"Test requires '{path}'"
        if not os.path.exists(path):
            msg += " which does not exist."
        else:
            msg += " which has incorrect permissions."

        if fatal:
            m5.fatal(msg)
        else:
            skip_test(msg)


def require_kvm(kvm_dev="/dev/kvm", fatal=False):
    """Test if KVM is available.

    Keyword arguments:
      kvm_dev -- Device to test (normally /dev/kvm)
      fatal -- Set to True to indicate that the test should fail
               instead of being skipped.
    """

    require_sim_object("BaseKvmCPU", fatal=fatal)
    require_file(kvm_dev, fatal=fatal, mode=os.R_OK | os.W_OK)


def run_test(root):
    """Default run_test implementations. Scripts can override it."""

    # instantiate configuration
    m5.instantiate()

    # simulate until program terminates
    exit_event = m5.simulate(maxtick)
    print("Exiting @ tick", m5.curTick(), "because", exit_event.getCause())


# Since we're in batch mode, dont allow tcp socket connections
m5.disableAllListeners()

# single "path" arg encodes everything we need to know about test
(category, mode, name, isa, opsys, config) = sys.argv[1].split("/")[-6:]

# find path to directory containing this file
tests_root = os.path.dirname(__file__)
test_progs = os.environ.get("M5_TEST_PROGS", "/dist/m5/regression/test-progs")
if not os.path.isdir(test_progs):
    test_progs = joinpath(tests_root, "test-progs")

# generate path to binary file
def binpath(app, file=None):
    # executable has same name as app unless specified otherwise
    if not file:
        file = app
    return joinpath(test_progs, app, "bin", isa, opsys, file)


# generate path to input file
def inputpath(app, file=None):
    # input file has same name as app unless specified otherwise
    if not file:
        file = app
    return joinpath(test_progs, app, "input", file)


def srcpath(path):
    """Path to file in gem5's source tree"""
    return joinpath(os.path.dirname(__file__), "..", path)


def run_config(config, argv=None):
    """Execute a configuration script that is external to the test system"""

    src_root = os.path.abspath(os.path.join(os.path.dirname(__file__), "../"))
    abs_path = joinpath(src_root, config)

    code = compile(open(abs_path, "r").read(), abs_path, "exec")
    scope = {"__file__": config, "__name__": "__m5_main__"}

    # Set the working directory in case we are executing from
    # outside gem5's source tree
    os.chdir(src_root)

    # gem5 normally adds the script's directory to the path to make
    # script-relative imports work.
    sys.path = [os.path.dirname(abs_path)] + sys.path

    if argv is None:
        sys.argv = [config]
    else:
        sys.argv = argv
    exec(code, scope)


# build configuration
sys.path.append(joinpath(tests_root, "configs"))
test_filename = config
# for ruby configurations, remove the protocol name from the test filename
if re.search("-ruby", test_filename):
    test_filename = test_filename.split("-ruby")[0] + "-ruby"
exec(
    compile(
        open(joinpath(tests_root, "configs", test_filename + ".py")).read(),
        joinpath(tests_root, "configs", test_filename + ".py"),
        "exec",
    )
)

# set default maxtick... script can override
# -1 means run forever
maxtick = m5.MaxTick

# tweak configuration for specific test
sys.path.append(joinpath(tests_root, category, mode, name))
exec(
    compile(
        open(joinpath(tests_root, category, mode, name, "test.py")).read(),
        joinpath(tests_root, category, mode, name, "test.py"),
        "exec",
    )
)

# Initialize all CPUs in a system
def initCPUs(sys):
    def initCPU(cpu):
        # We might actually have a MemTest object or something similar
        # here that just pretends to be a CPU.
        try:
            cpu.createThreads()
        except:
            pass

    # The CPU attribute doesn't exist in some cases, e.g. the Ruby
    # testers.
    if not hasattr(sys, "cpu"):
        return

    # The CPU can either be a list of CPUs or a single object.
    if isinstance(sys.cpu, list):
        [initCPU(cpu) for cpu in sys.cpu]
    else:
        initCPU(sys.cpu)


# We might be creating a single system or a dual system. Try
# initializing the CPUs in all known system attributes.
for sysattr in ["system", "testsys", "drivesys"]:
    if hasattr(root, sysattr):
        initCPUs(getattr(root, sysattr))

run_test(root)