405 lines
13 KiB
Python
Executable file
405 lines
13 KiB
Python
Executable file
#!/usr/bin/env python3
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#
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# Copyright (C) 2019 The Android Open Source Project
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in
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# the documentation and/or other materials provided with the
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# distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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# Generate a benchmark using a JSON dump of ELF file symbols and relocations.
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import argparse
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import codecs
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import json
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import math
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import os
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import re
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import shlex
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import shutil
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import subprocess
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import sys
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import tempfile
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import textwrap
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import typing
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from enum import Enum
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from typing import Dict, List, Optional, Set
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from subprocess import PIPE, DEVNULL
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from pathlib import Path
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from common_types import LoadedLibrary, SymbolRef, SymKind, bfs_walk, json_to_elf_tree
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g_obfuscate = True
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g_benchmark_name = 'linker_reloc_bench'
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kBionicSonames: Set[str] = set([
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'libc.so',
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'libdl.so',
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'libdl_android.so',
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'libm.so',
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'ld-android.so',
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])
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# Skip these symbols so the benchmark runs on multiple C libraries (glibc, Bionic, musl).
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kBionicIgnoredSymbols: Set[str] = set([
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'__FD_ISSET_chk',
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'__FD_SET_chk',
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'__assert',
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'__assert2',
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'__b64_ntop',
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'__cmsg_nxthdr',
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'__cxa_thread_atexit_impl',
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'__errno',
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'__gnu_basename',
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'__gnu_strerror_r',
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'__memcpy_chk',
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'__memmove_chk',
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'__memset_chk',
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'__open_2',
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'__openat_2',
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'__pread64_chk',
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'__pread_chk',
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'__read_chk',
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'__readlink_chk',
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'__register_atfork',
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'__sF',
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'__strcat_chk',
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'__strchr_chk',
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'__strcpy_chk',
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'__strlcat_chk',
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'__strlcpy_chk',
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'__strlen_chk',
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'__strncat_chk',
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'__strncpy_chk',
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'__strncpy_chk2',
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'__strrchr_chk',
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'__system_property_area_serial',
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'__system_property_find',
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'__system_property_foreach',
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'__system_property_get',
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'__system_property_read',
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'__system_property_serial',
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'__system_property_set',
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'__umask_chk',
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'__vsnprintf_chk',
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'__vsprintf_chk',
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'android_dlopen_ext',
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'android_set_abort_message',
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'arc4random_buf',
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'dl_unwind_find_exidx',
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'fts_close',
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'fts_open',
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'fts_read',
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'fts_set',
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'getprogname',
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'gettid',
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'isnanf',
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'mallinfo',
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'malloc_info',
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'pthread_gettid_np',
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'res_mkquery',
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'strlcpy',
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'strtoll_l',
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'strtoull_l',
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'tgkill',
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])
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Definitions = Dict[str, LoadedLibrary]
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def build_symbol_index(lib: LoadedLibrary) -> Definitions:
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defs: Dict[str, LoadedLibrary] = {}
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for lib in bfs_walk(lib):
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for sym in lib.syms.values():
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if not sym.defined: continue
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defs.setdefault(sym.name, lib)
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return defs
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def check_rels(root: LoadedLibrary, defs: Definitions) -> None:
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# Find every symbol for every relocation in the load group.
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has_missing = False
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for lib in bfs_walk(root):
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rels = lib.rels
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for sym in rels.got + rels.jump_slots + [sym for off, sym in rels.symbolic]:
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if sym.name not in defs:
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if sym.is_weak:
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pass # print('info: weak undefined', lib.soname, r)
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else:
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print(f'error: {lib.soname}: unresolved relocation to {sym.name}')
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has_missing = True
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if has_missing: sys.exit('error: had unresolved relocations')
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# Obscure names to avoid polluting Android code search.
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def rot13(text: str) -> str:
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if g_obfuscate:
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result = codecs.getencoder("rot-13")(text)[0]
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assert isinstance(result, str)
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return result
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else:
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return text
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def make_asm_file(lib: LoadedLibrary, is_main: bool, out_filename: Path, map_out_filename: Path,
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defs: Definitions) -> bool:
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def trans_sym(name: str, ver: Optional[str]) -> Optional[str]:
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nonlocal defs
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d = defs.get(name)
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if d is not None and d.soname in kBionicSonames:
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if name in kBionicIgnoredSymbols: return None
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# Discard relocations to newer Bionic symbols, because there aren't many of them, and
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# they would limit where the benchmark can run.
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if ver == 'LIBC': return name
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return None
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return 'b_' + rot13(name)
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versions: Dict[Optional[str], List[str]] = {}
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with open(out_filename, 'w') as out:
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out.write(f'// AUTO-GENERATED BY {os.path.basename(__file__)} -- do not edit manually\n')
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out.write(f'#include "{g_benchmark_name}_asm.h"\n')
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out.write('.data\n')
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out.write('.p2align 4\n')
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if is_main:
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out.write('.text\n' 'MAIN\n')
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for d in lib.syms.values():
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if not d.defined: continue
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sym = trans_sym(d.name, None)
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if sym is None: continue
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if d.kind == SymKind.Func:
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out.write('.text\n'
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f'.globl {sym}\n'
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f'.type {sym},%function\n'
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f'{sym}:\n'
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'nop\n')
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else: # SymKind.Var
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out.write('.data\n'
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f'.globl {sym}\n'
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f'.type {sym},%object\n'
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f'{sym}:\n'
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f'.space __SIZEOF_POINTER__\n')
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versions.setdefault(d.ver_name, []).append(sym)
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out.write('.text\n')
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for r in lib.rels.jump_slots:
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sym = trans_sym(r.name, r.ver)
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if sym is None: continue
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if r.is_weak: out.write(f'.weak {sym}\n')
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out.write(f'CALL({sym})\n')
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out.write('.text\n')
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for r in lib.rels.got:
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sym = trans_sym(r.name, r.ver)
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if sym is None: continue
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if r.is_weak: out.write(f'.weak {sym}\n')
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out.write(f'GOT_RELOC({sym})\n')
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out.write('.data\n')
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out.write('local_label:\n')
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image = []
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for off in lib.rels.relative:
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image.append((off, f'DATA_WORD(local_label)\n'))
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for off, r in lib.rels.symbolic:
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sym = trans_sym(r.name, r.ver)
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if sym is None: continue
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text = f'DATA_WORD({sym})\n'
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if r.is_weak: text += f'.weak {sym}\n'
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image.append((off, text))
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image.sort()
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cur_off = 0
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for off, text in image:
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if cur_off < off:
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out.write(f'.space (__SIZEOF_POINTER__ * {off - cur_off})\n')
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cur_off = off
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out.write(text)
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cur_off += 1
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has_map_file = False
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if len(versions) > 0 and list(versions.keys()) != [None]:
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has_map_file = True
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with open(map_out_filename, 'w') as out:
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if None in versions:
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print(f'error: {out_filename} has both unversioned and versioned symbols')
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print(versions.keys())
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sys.exit(1)
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for ver in sorted(versions.keys()):
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assert ver is not None
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out.write(f'{rot13(ver)} {{\n')
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if len(versions[ver]) > 0:
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out.write(' global:\n')
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out.write(''.join(f' {x};\n' for x in versions[ver]))
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out.write(f'}};\n')
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return has_map_file
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class LibNames:
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def __init__(self, root: LoadedLibrary):
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self._root = root
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self._names: Dict[LoadedLibrary, str] = {}
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all_libs = [x for x in bfs_walk(root) if x is not root and x.soname not in kBionicSonames]
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num_digits = math.ceil(math.log10(len(all_libs) + 1))
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if g_obfuscate:
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self._names = {x : f'{i:0{num_digits}}' for i, x in enumerate(all_libs)}
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else:
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self._names = {x : re.sub(r'\.so$', '', x.soname) for x in all_libs}
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def name(self, lib: LoadedLibrary) -> str:
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if lib is self._root:
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return f'{g_benchmark_name}_main'
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else:
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return f'lib{g_benchmark_name}_{self._names[lib]}'
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# Generate a ninja file directly that builds the benchmark using a C compiler driver and ninja.
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# Using a driver directly can be faster than building with Soong, and it allows testing
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# configurations that Soong can't target, like musl.
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def make_ninja_benchmark(root: LoadedLibrary, defs: Definitions, cc: str, out: Path) -> None:
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lib_names = LibNames(root)
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def lib_dso_name(lib: LoadedLibrary) -> str:
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return lib_names.name(lib) + '.so'
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ninja = open(out / 'build.ninja', 'w')
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include_path = os.path.relpath(os.path.dirname(__file__) + '/../include', out)
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common_flags = f"-Wl,-rpath-link,. -lm -I{include_path}"
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ninja.write(textwrap.dedent(f'''\
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rule exe
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command = {cc} -fpie -pie $in -o $out {common_flags} $extra_args
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rule dso
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command = {cc} -fpic -shared $in -o $out -Wl,-soname,$out {common_flags} $extra_args
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'''))
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for lib in bfs_walk(root):
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if lib.soname in kBionicSonames: continue
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lib_base_name = lib_names.name(lib)
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asm_name = lib_base_name + '.S'
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map_name = lib_base_name + '.map'
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asm_path = out / asm_name
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map_path = out / map_name
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has_map_file = make_asm_file(lib, lib is root, asm_path, map_path, defs)
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needed = ' '.join([lib_dso_name(x) for x in lib.needed if x.soname not in kBionicSonames])
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if lib is root:
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ninja.write(f'build {lib_base_name}: exe {asm_name} {needed}\n')
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else:
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ninja.write(f'build {lib_dso_name(lib)}: dso {asm_name} {needed}\n')
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if has_map_file:
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ninja.write(f' extra_args = -Wl,--version-script={map_name}\n')
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ninja.close()
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subprocess.run(['ninja', '-C', str(out), lib_names.name(root)], check=True)
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def make_soong_benchmark(root: LoadedLibrary, defs: Definitions, out: Path) -> None:
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lib_names = LibNames(root)
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bp = open(out / 'Android.bp', 'w')
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bp.write(f'// AUTO-GENERATED BY {os.path.basename(__file__)} -- do not edit\n')
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bp.write(f'package {{ default_applicable_licenses: ["bionic_benchmarks_license"], }}\n')
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bp.write(f'cc_defaults {{\n')
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bp.write(f' name: "{g_benchmark_name}_all_libs",\n')
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bp.write(f' runtime_libs: [\n')
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for lib in bfs_walk(root):
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if lib.soname in kBionicSonames: continue
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if lib is root: continue
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bp.write(f' "{lib_names.name(lib)}",\n')
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bp.write(f' ],\n')
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bp.write(f'}}\n')
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for lib in bfs_walk(root):
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if lib.soname in kBionicSonames: continue
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lib_base_name = lib_names.name(lib)
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asm_name = lib_base_name + '.S'
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map_name = lib_base_name + '.map'
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asm_path = out / asm_name
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map_path = out / map_name
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has_map_file = make_asm_file(lib, lib is root, asm_path, map_path, defs)
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if lib is root:
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bp.write(f'cc_binary {{\n')
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bp.write(f' defaults: ["{g_benchmark_name}_binary"],\n')
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else:
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bp.write(f'cc_test_library {{\n')
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bp.write(f' defaults: ["{g_benchmark_name}_library"],\n')
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bp.write(f' name: "{lib_base_name}",\n')
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bp.write(f' srcs: ["{asm_name}"],\n')
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bp.write(f' shared_libs: [\n')
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for need in lib.needed:
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if need.soname in kBionicSonames: continue
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bp.write(f' "{lib_names.name(need)}",\n')
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bp.write(f' ],\n')
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if has_map_file:
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bp.write(f' version_script: "{map_name}",\n')
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bp.write('}\n')
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bp.close()
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def main() -> None:
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parser = argparse.ArgumentParser()
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parser.add_argument('input', type=str)
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parser.add_argument('out_dir', type=str)
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parser.add_argument('--ninja', action='store_true',
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help='Generate a benchmark using a compiler and ninja rather than Soong')
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parser.add_argument('--cc',
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help='For --ninja, a target-specific C clang driver and flags (e.g. "'
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'$NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android29-clang'
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' -fuse-ld=lld")')
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args = parser.parse_args()
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if args.ninja:
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if args.cc is None: sys.exit('error: --cc required with --ninja')
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out = Path(args.out_dir)
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with open(Path(args.input)) as f:
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root = json_to_elf_tree(json.load(f))
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defs = build_symbol_index(root)
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check_rels(root, defs)
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if out.exists(): shutil.rmtree(out)
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os.makedirs(str(out))
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if args.ninja:
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make_ninja_benchmark(root, defs, args.cc, out)
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else:
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make_soong_benchmark(root, defs, out)
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if __name__ == '__main__':
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main()
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