#!/usr/bin/env python
# Script checking that all symbols exported by libpython start with Py or _Py

import os.path
import subprocess
import sys
import sysconfig


ALLOWED_PREFIXES = ('Py', '_Py')
if sys.platform == 'darwin':
    ALLOWED_PREFIXES += ('__Py',)

IGNORED_EXTENSION = "_ctypes_test"
# Ignore constructor and destructor functions
IGNORED_SYMBOLS = {'_init', '_fini'}


def is_local_symbol_type(symtype):
    # Ignore local symbols.

    # If lowercase, the symbol is usually local; if uppercase, the symbol
    # is global (external).  There are however a few lowercase symbols that
    # are shown for special global symbols ("u", "v" and "w").
    if symtype.islower() and symtype not in "uvw":
        return True

    # Ignore the initialized data section (d and D) and the BSS data
    # section. For example, ignore "__bss_start (type: B)"
    # and "_edata (type: D)".
    if symtype in "bBdD":
        return True

    return False


def get_exported_symbols(library, dynamic=False):
    print(f"Check that {library} only exports symbols starting with Py or _Py")

    # Only look at dynamic symbols
    args = ['nm', '--no-sort']
    if dynamic:
        args.append('--dynamic')
    args.append(library)
    print("+ %s" % ' '.join(args))
    proc = subprocess.run(args, stdout=subprocess.PIPE, universal_newlines=True)
    if proc.returncode:
        sys.stdout.write(proc.stdout)
        sys.exit(proc.returncode)

    stdout = proc.stdout.rstrip()
    if not stdout:
        raise Exception("command output is empty")
    return stdout


def get_smelly_symbols(stdout):
    smelly_symbols = []
    python_symbols = []
    local_symbols = []

    for line in stdout.splitlines():
        # Split line '0000000000001b80 D PyTextIOWrapper_Type'
        if not line:
            continue

        parts = line.split(maxsplit=2)
        if len(parts) < 3:
            continue

        symtype = parts[1].strip()
        symbol = parts[-1]
        result = '%s (type: %s)' % (symbol, symtype)

        if symbol.startswith(ALLOWED_PREFIXES):
            python_symbols.append(result)
            continue

        if is_local_symbol_type(symtype):
            local_symbols.append(result)
        elif symbol in IGNORED_SYMBOLS:
            local_symbols.append(result)
        else:
            smelly_symbols.append(result)

    if local_symbols:
        print(f"Ignore {len(local_symbols)} local symbols")
    return smelly_symbols, python_symbols


def check_library(library, dynamic=False):
    nm_output = get_exported_symbols(library, dynamic)
    smelly_symbols, python_symbols = get_smelly_symbols(nm_output)

    if not smelly_symbols:
        print(f"OK: no smelly symbol found ({len(python_symbols)} Python symbols)")
        return 0

    print()
    smelly_symbols.sort()
    for symbol in smelly_symbols:
        print("Smelly symbol: %s" % symbol)

    print()
    print("ERROR: Found %s smelly symbols!" % len(smelly_symbols))
    return len(smelly_symbols)


def check_extensions():
    print(__file__)
    # This assumes pybuilddir.txt is in same directory as pyconfig.h.
    # In the case of out-of-tree builds, we can't assume pybuilddir.txt is
    # in the source folder.
    config_dir = os.path.dirname(sysconfig.get_config_h_filename())
    filename = os.path.join(config_dir, "pybuilddir.txt")
    try:
        with open(filename, encoding="utf-8") as fp:
            pybuilddir = fp.readline()
    except FileNotFoundError:
        print(f"Cannot check extensions because {filename} does not exist")
        return True

    print(f"Check extension modules from {pybuilddir} directory")
    builddir = os.path.join(config_dir, pybuilddir)
    nsymbol = 0
    for name in os.listdir(builddir):
        if not name.endswith(".so"):
            continue
        if IGNORED_EXTENSION in name:
            print()
            print(f"Ignore extension: {name}")
            continue

        print()
        filename = os.path.join(builddir, name)
        nsymbol += check_library(filename, dynamic=True)

    return nsymbol


def main():
    nsymbol = 0

    # static library
    LIBRARY = sysconfig.get_config_var('LIBRARY')
    if not LIBRARY:
        raise Exception("failed to get LIBRARY variable from sysconfig")
    if os.path.exists(LIBRARY):
        nsymbol += check_library(LIBRARY)

    # dynamic library
    LDLIBRARY = sysconfig.get_config_var('LDLIBRARY')
    if not LDLIBRARY:
        raise Exception("failed to get LDLIBRARY variable from sysconfig")
    if LDLIBRARY != LIBRARY:
        print()
        nsymbol += check_library(LDLIBRARY, dynamic=True)

    # Check extension modules like _ssl.cpython-310d-x86_64-linux-gnu.so
    nsymbol += check_extensions()

    if nsymbol:
        print()
        print(f"ERROR: Found {nsymbol} smelly symbols in total!")
        sys.exit(1)

    print()
    print(f"OK: all exported symbols of all libraries "
          f"are prefixed with {' or '.join(map(repr, ALLOWED_PREFIXES))}")


if __name__ == "__main__":
    main()

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