hpvm_installer.py

#!/usr/bin/env python3
from pathlib import Path
from argparse import ArgumentParser, Namespace
from subprocess import check_call
from os import makedirs, chdir, environ

VERSION = "9.0.0"
URL = "http://releases.llvm.org"
WGET = "wget"
CLANG_DIR = f"cfe-{VERSION}.src"
CLANG_TARBALL = f"{CLANG_DIR}.tar.xz"
LLVM_DIR = f"llvm-{VERSION}.src"
LLVM_TARBALL = f"{LLVM_DIR}.tar.xz"

ROOT_DIR = Path.cwd()
BUILD_DIR = ROOT_DIR / "build"
TEST_DIR = ROOT_DIR / "test"
LLVM_LIT = BUILD_DIR / "bin/llvm-lit"

LINKS = [
    "CMakeLists.txt",
    "cmake",
    "include",
    "lib",
    "projects",
    "test",
    "tools",
]
MAKE_TARGETS = ["approxhpvm.py"]
MAKE_TEST_TARGETS = ["hpvm-check"]


def parse_args():
    parser = ArgumentParser(
        "hpvm_installer", description="Script for automatic HPVM installation."
    )
    parser.add_argument(
        "-m",
        "--no-build",
        action="store_true",
        help="Configure but don't build HPVM. "
        "This will require you to install HPVM manually using cmake and make. "
        "For more details, refer to README.md. Default: False.",
    )
    parser.add_argument(
        "-j",
        "--parallel",
        type=int,
        default=2,
        help="How many threads to build with. This argument is relayed on to 'make'. Default: 2",
    )
    parser.add_argument(
        "-t",
        "--targets",
        type=str,
        default="all",
        help="Build target(s) for LLVM such as X86, ARM. "
        'Use semicolon to separate multiple targets such as "X86;ARM". '
        'Defaults to "all" which is to build all supported targets. '
        "Supported targets: AArch64, AMDGPU, ARM, BPF, Hexagon, Mips, MSP430, NVPTX, PowerPC, "
        "Sparc, SystemZ, X86, XCore.",
    )
    parser.add_argument(
        "-r", "--run-tests", action="store_true", help="Build and run test cases"
    )
    return parser.parse_args()


def prompt_args():
    def parse_yn(s: str):
        table = {"y": True, "n": False}
        return table.get(s)

    def parse_int(s: str):
        try:
            v = int(s)
            return v
        except ValueError:
            return None
        if v <= 0:
            return None

    def parse_targets(s: str):
        if " " in s:
            return None
        return s

    print("No Flags found. Using command line prompts.")
    print("Alternatively, please call this script with -h for all available options.")
    auto_build = input_with_check(
        "Build and install HPVM automatically? [y/n]: ", parse_yn, "Please enter y or n"
    )
    if not auto_build:
        # Just stuff something in the other fields. We won't need them.
        return Namespace(no_build=True, parallel="", targets="", run_tests=False)
    threads = input_with_check(
        "Number of threads: ", parse_int, "Please enter a positive integer"
    )
    print(
        "These build targets are supported: AArch64, AMDGPU, ARM, BPF, Hexagon, "
        "Mips, MSP430, NVPTX, PowerPC, Sparc, SystemZ, X86, XCore.\n"
        "If building for multiple targets, seperate options with semicolon:\n"
        "e.g. X86;ARM"
    )
    targets = input_with_check(
        "Build target: ", parse_targets, "Input shouldn't contain space"
    )

    run_tests = input_with_check(
        "Build and run tests? [y/n]: ", parse_yn, "Please enter y or n"
    )
    return Namespace(
        no_build=not auto_build, parallel=threads, targets=targets, run_tests=run_tests
    )


def print_args(args):
    print("Running with the following options:")
    print(f"  Automated: {not args.no_build}")
    print(f"  Threads: {args.parallel}")
    print(f"  Targets: {args.targets}")
    print(f"  Run tests: {args.run_tests}")


def check_download_llvm_clang():
    if Path("llvm/").is_dir():
        print("Found LLVM, not extracting it again.")
    else:
        if Path(LLVM_TARBALL).is_file():
            print(f"Found {LLVM_TARBALL}, not downloading it again.")
        else:
            print(f"Downloading {LLVM_TARBALL}...")
            print(f"=============================")
            check_call([WGET, f"{URL}/{VERSION}/{LLVM_TARBALL}"])
        check_call(["tar", "xf", LLVM_TARBALL])
        check_call(["mv", LLVM_DIR, "llvm"])
    tools = Path("llvm/tools")
    assert tools.is_dir(), "Problem with LLVM download. Exiting!"
    if Path(LLVM_TARBALL).is_file():
        Path(LLVM_TARBALL).unlink()  # Remove tarball
    environ["LLVM_SRC_ROOT"] = str(ROOT_DIR / "llvm")

    if (tools / "clang/").is_dir():
        print("Found clang, not downloading it again.")
        return
    chdir(tools)
    print(f"Downloading {CLANG_TARBALL}...")
    print(f"=============================")
    check_call([WGET, f"{URL}/{VERSION}/{CLANG_TARBALL}"])
    check_call(["tar", "xf", CLANG_TARBALL])
    check_call(["mv", CLANG_DIR, "clang"])
    assert Path("clang/").is_dir(), "Problem with clang download. Exiting!"
    if Path(CLANG_TARBALL).is_file():
        Path(CLANG_TARBALL).unlink()
    chdir(ROOT_DIR)


def link_and_patch():
    from os import symlink

    hpvm = ROOT_DIR / "llvm/tools/hpvm"
    print("Adding HPVM sources to tree...")
    makedirs(hpvm, exist_ok=True)
    for link in LINKS:
        if not (hpvm / link).exists():
            print(ROOT_DIR / link, hpvm / link)
            symlink(ROOT_DIR / link, hpvm / link)
    print("Applying HPVM patches...")
    chdir("llvm_patches")
    check_call(["bash", "./construct_patch.sh"])
    check_call(["bash", "./apply_patch.sh"])
    print("Patches applied.")
    chdir("..")


def maybe_build(build: bool, nthreads: int, targets: str, build_test_targets: bool):
    if not build:
        print(
            """
HPVM not installed.
To complete installation, follow these instructions:
- Create and navigate to a folder "./build" 
- Run "cmake ../llvm [options]". Find potential options in README.md.
- Run "make -j<number of threads> approxhpvm.py" and then "make install"
For more details refer to README.md.
"""
        )
        return
    print("Now building...")
    print(f"Using {nthreads} threads to build HPVM.")
    makedirs(BUILD_DIR, exist_ok=True)

    chdir(BUILD_DIR)
    cmake_args = [
        "cmake",
        "../llvm",
        "-DCMAKE_C_COMPILER=gcc",
        "-DCMAKE_CXX_COMPILER=g++",
        f"-DLLVM_TARGETS_TO_BUILD={targets}",
    ]
    print(f"CMake: {' '.join(cmake_args)}")
    print(f"=============================")
    check_call(cmake_args)
    make_args = ["make", f"-j{nthreads}", *MAKE_TARGETS]
    if build_test_targets:
        make_args += MAKE_TEST_TARGETS
    print(f"Make: {' '.join(make_args)}")
    print(f"=============================")
    check_call(make_args)
    chdir(ROOT_DIR)


def run_tests():
    chdir(BUILD_DIR)
    # Run regression tests
    check_call([LLVM_LIT, "-v", TEST_DIR / "regressionTests"])
    # Run unit tests
    check_call([LLVM_LIT, "-v", TEST_DIR / "unitTests"])


def input_with_check(prompt: str, parse, prompt_when_invalid: str):
    input_str = input(prompt)
    value = parse(input_str)
    while value is None:
        print(f"{prompt_when_invalid}; got {input_str}")
        input_str = input(prompt)
        value = parse(input_str)
    return value


def main():
    from sys import argv

    # Don't parse args if no args given -- use prompt mode
    args = prompt_args() if len(argv) == 1 else parse_args()
    print_args(args)
    check_download_llvm_clang()
    link_and_patch()
    maybe_build(not args.no_build, args.parallel, args.targets, args.run_tests)
    if args.run_tests:
        run_tests()
    else:
        print("Skipping tests.")


if __name__ == "__main__":
    main()