701109b9b6
Fix llvm-bolt-wrapper to skip output file checks if llvm-bolt exits with error code. Test Plan: - checkout to revision with invalid NFC mismatch in `is-strip.s` test (e.g. 056af487831fb573e6895901d1e48f93922f9635~) - run `nfc-check-setup.py` - run `bin/llvm-lit -a tools/bolt/test/X86/is-strip.s` Reviewed By: #bolt, rafauler Differential Revision: https://reviews.llvm.org/D143614
402 lines
14 KiB
Python
Executable File
402 lines
14 KiB
Python
Executable File
#!/usr/bin/env python3
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import argparse
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import subprocess
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from typing import *
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import tempfile
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import copy
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import os
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import shutil
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import sys
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import re
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import configparser
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from types import SimpleNamespace
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from textwrap import dedent
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# USAGE:
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# 0. Prepare two BOLT build versions: base and compare.
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# 1. Create the config by invoking this script with required options.
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# Save the config as `llvm-bolt-wrapper.ini` next to the script or
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# in the testing directory.
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# In the base BOLT build directory:
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# 2. Rename `llvm-bolt` to `llvm-bolt.real`
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# 3. Create a symlink from this script to `llvm-bolt`
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# 4. Create `llvm-bolt-wrapper.ini` and fill it using the example below.
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#
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# This script will compare binaries produced by base and compare BOLT, and
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# report elapsed processing time and max RSS.
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# read options from config file llvm-bolt-wrapper.ini in script CWD
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#
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# [config]
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# # mandatory
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# base_bolt = /full/path/to/llvm-bolt.real
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# cmp_bolt = /full/path/to/other/llvm-bolt
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# # optional, default to False
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# verbose
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# keep_tmp
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# no_minimize
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# run_sequentially
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# compare_output
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# skip_binary_cmp
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# # optional, defaults to timing.log in CWD
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# timing_file = timing1.log
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def read_cfg():
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src_dir = os.path.dirname(os.path.abspath(__file__))
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cfg = configparser.ConfigParser(allow_no_value = True)
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cfgs = cfg.read("llvm-bolt-wrapper.ini")
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if not cfgs:
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cfgs = cfg.read(os.path.join(src_dir, "llvm-bolt-wrapper.ini"))
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assert cfgs, f"llvm-bolt-wrapper.ini is not found in {os.getcwd()}"
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def get_cfg(key):
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# if key is not present in config, assume False
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if key not in cfg['config']:
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return False
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# if key is present, but has no value, assume True
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if not cfg['config'][key]:
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return True
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# if key has associated value, interpret the value
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return cfg['config'].getboolean(key)
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d = {
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# BOLT binary locations
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'BASE_BOLT': cfg['config']['base_bolt'],
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'CMP_BOLT': cfg['config']['cmp_bolt'],
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# optional
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'VERBOSE': get_cfg('verbose'),
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'KEEP_TMP': get_cfg('keep_tmp'),
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'NO_MINIMIZE': get_cfg('no_minimize'),
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'RUN_SEQUENTIALLY': get_cfg('run_sequentially'),
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'COMPARE_OUTPUT': get_cfg('compare_output'),
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'SKIP_BINARY_CMP': get_cfg('skip_binary_cmp'),
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'TIMING_FILE': cfg['config'].get('timing_file', 'timing.log'),
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}
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if d['VERBOSE']:
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print(f"Using config {os.path.abspath(cfgs[0])}")
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return SimpleNamespace(**d)
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# perf2bolt mode
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PERF2BOLT_MODE = ['-aggregate-only', '-ignore-build-id']
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# boltdiff mode
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BOLTDIFF_MODE = ['-diff-only', '-o', '/dev/null']
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# options to suppress binary differences as much as possible
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MINIMIZE_DIFFS = ['-bolt-info=0']
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# bolt output options that need to be intercepted
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BOLT_OUTPUT_OPTS = {
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'-o': 'BOLT output binary',
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'-w': 'BOLT recorded profile',
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}
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# regex patterns to exclude the line from log comparison
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SKIP_MATCH = [
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'BOLT-INFO: BOLT version',
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r'^Args: ',
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r'^BOLT-DEBUG:',
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r'BOLT-INFO:.*data.*output data',
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'WARNING: reading perf data directly',
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]
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def run_cmd(cmd, out_f, cfg):
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if cfg.VERBOSE:
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print(' '.join(cmd))
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return subprocess.Popen(cmd, stdout=out_f, stderr=subprocess.STDOUT)
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def run_bolt(bolt_path, bolt_args, out_f, cfg):
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p2b = os.path.basename(sys.argv[0]) == 'perf2bolt' # perf2bolt mode
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bd = os.path.basename(sys.argv[0]) == 'llvm-boltdiff' # boltdiff mode
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hm = sys.argv[1] == 'heatmap' # heatmap mode
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cmd = ['/usr/bin/time', '-f', '%e %M', bolt_path] + bolt_args
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if p2b:
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# -ignore-build-id can occur at most once, hence remove it from cmd
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if '-ignore-build-id' in cmd:
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cmd.remove('-ignore-build-id')
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cmd += PERF2BOLT_MODE
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elif bd:
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cmd += BOLTDIFF_MODE
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elif not cfg.NO_MINIMIZE and not hm:
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cmd += MINIMIZE_DIFFS
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return run_cmd(cmd, out_f, cfg)
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def prepend_dash(args: Mapping[AnyStr, AnyStr]) -> Sequence[AnyStr]:
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'''
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Accepts parsed arguments and returns flat list with dash prepended to
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the option.
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Example: Namespace(o='test.tmp') -> ['-o', 'test.tmp']
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'''
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dashed = [('-'+key,value) for (key,value) in args.items()]
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flattened = list(sum(dashed, ()))
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return flattened
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def replace_cmp_path(tmp: AnyStr, args: Mapping[AnyStr, AnyStr]) -> Sequence[AnyStr]:
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'''
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Keeps file names, but replaces the path to a temp folder.
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Example: Namespace(o='abc/test.tmp') -> Namespace(o='/tmp/tmpf9un/test.tmp')
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Except preserve /dev/null.
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'''
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replace_path = lambda x: os.path.join(tmp, os.path.basename(x)) if x != '/dev/null' else '/dev/null'
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new_args = {key: replace_path(value) for key, value in args.items()}
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return prepend_dash(new_args)
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def preprocess_args(args: argparse.Namespace) -> Mapping[AnyStr, AnyStr]:
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'''
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Drop options that weren't parsed (e.g. -w), convert to a dict
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'''
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return {key: value for key, value in vars(args).items() if value}
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def write_to(txt, filename, mode='w'):
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with open(filename, mode) as f:
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f.write(txt)
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def wait(proc, fdesc):
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proc.wait()
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fdesc.close()
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return open(fdesc.name)
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def compare_logs(main, cmp, skip_begin=0, skip_end=0, str_input=True):
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'''
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Compares logs but allows for certain lines to be excluded from comparison.
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If str_input is True (default), the input it assumed to be a string,
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which is split into lines. Otherwise the input is assumed to be a file.
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Returns None on success, mismatch otherwise.
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'''
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main_inp = main.splitlines() if str_input else main.readlines()
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cmp_inp = cmp.splitlines() if str_input else cmp.readlines()
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# rewind logs after consumption
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if not str_input:
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main.seek(0)
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cmp.seek(0)
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for lhs, rhs in list(zip(main_inp, cmp_inp))[skip_begin:-skip_end or None]:
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if lhs != rhs:
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# check skip patterns
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for skip in SKIP_MATCH:
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# both lines must contain the pattern
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if re.search(skip, lhs) and re.search(skip, rhs):
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break
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# otherwise return mismatching lines
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else:
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return (lhs, rhs)
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return None
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def fmt_cmp(cmp_tuple):
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if not cmp_tuple:
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return ''
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return f'main:\n{cmp_tuple[0]}\ncmp:\n{cmp_tuple[1]}\n'
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def compare_with(lhs, rhs, cmd, skip_begin=0, skip_end=0):
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'''
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Runs cmd on both lhs and rhs and compares stdout.
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Returns tuple (mismatch, lhs_stdout):
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- if stdout matches between two files, mismatch is None,
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- otherwise mismatch is a tuple of mismatching lines.
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'''
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run = lambda binary: subprocess.run(cmd.split() + [binary],
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text=True, check=True,
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capture_output=True).stdout
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run_lhs = run(lhs)
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run_rhs = run(rhs)
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cmp = compare_logs(run_lhs, run_rhs, skip_begin, skip_end)
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return cmp, run_lhs
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def parse_cmp_offset(cmp_out):
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'''
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Extracts byte number from cmp output:
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file1 file2 differ: byte X, line Y
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'''
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return int(re.search(r'byte (\d+),', cmp_out).groups()[0])
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def report_real_time(binary, main_err, cmp_err, cfg):
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'''
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Extracts real time from stderr and appends it to TIMING FILE it as csv:
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"output binary; base bolt; cmp bolt"
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'''
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def get_real_from_stderr(logline):
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return '; '.join(logline.split())
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for line in main_err:
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pass
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main = get_real_from_stderr(line)
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for line in cmp_err:
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pass
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cmp = get_real_from_stderr(line)
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write_to(f"{binary}; {main}; {cmp}\n", cfg.TIMING_FILE, 'a')
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# rewind logs after consumption
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main_err.seek(0)
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cmp_err.seek(0)
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def clean_exit(tmp, out, exitcode, cfg):
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# temp files are only cleaned on success
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if not cfg.KEEP_TMP:
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shutil.rmtree(tmp)
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# report stdout and stderr from the main process
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shutil.copyfileobj(out, sys.stdout)
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sys.exit(exitcode)
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def find_section(offset, readelf_hdr):
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hdr = readelf_hdr.split('\n')
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section = None
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# extract sections table (parse objdump -hw output)
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for line in hdr[5:-1]:
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cols = line.strip().split()
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# extract section offset
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file_offset = int(cols[5], 16)
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# section size
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size = int(cols[2], 16)
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if offset >= file_offset and offset <= file_offset + size:
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if sys.stdout.isatty(): # terminal supports colors
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print(f"\033[1m{line}\033[0m")
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else:
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print(f">{line}")
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section = cols[1]
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else:
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print(line)
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return section
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def main_config_generator():
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parser = argparse.ArgumentParser()
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parser.add_argument('base_bolt', help='Full path to base llvm-bolt binary')
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parser.add_argument('cmp_bolt', help='Full path to cmp llvm-bolt binary')
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parser.add_argument('--verbose', action='store_true',
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help='Print subprocess invocation cmdline (default False)')
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parser.add_argument('--keep_tmp', action='store_true',
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help = 'Preserve tmp folder on a clean exit '
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'(tmp directory is preserved on crash by default)')
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parser.add_argument('--no_minimize', action='store_true',
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help=f'Do not add `{MINIMIZE_DIFFS}` that is used '
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'by default to reduce binary differences')
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parser.add_argument('--run_sequentially', action='store_true',
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help='Run both binaries sequentially (default '
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'in parallel). Use for timing comparison')
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parser.add_argument('--compare_output', action='store_true',
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help = 'Compare bolt stdout/stderr (disabled by default)')
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parser.add_argument('--skip_binary_cmp', action='store_true',
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help = 'Disable output comparison')
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parser.add_argument('--timing_file', help = 'Override path to timing log '
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'file (default `timing.log` in CWD)')
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args = parser.parse_args()
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print(dedent(f'''\
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[config]
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# mandatory
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base_bolt = {args.base_bolt}
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cmp_bolt = {args.cmp_bolt}'''))
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del args.base_bolt
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del args.cmp_bolt
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d = vars(args)
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if any(d.values()):
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print("# optional")
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for key, value in d.items():
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if value:
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print(key)
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def main():
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cfg = read_cfg()
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# intercept output arguments
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parser = argparse.ArgumentParser(add_help=False)
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for option, help in BOLT_OUTPUT_OPTS.items():
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parser.add_argument(option, help=help)
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args, unknownargs = parser.parse_known_args()
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args = preprocess_args(args)
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cmp_args = copy.deepcopy(args)
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tmp = tempfile.mkdtemp()
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cmp_args = replace_cmp_path(tmp, cmp_args)
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# reconstruct output arguments: prepend dash
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args = prepend_dash(args)
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# run both BOLT binaries
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main_f = open(os.path.join(tmp, 'main_bolt.stdout'), 'w')
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cmp_f = open(os.path.join(tmp, 'cmp_bolt.stdout'), 'w')
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main_bolt = run_bolt(cfg.BASE_BOLT, unknownargs + args, main_f, cfg)
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if cfg.RUN_SEQUENTIALLY:
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main_out = wait(main_bolt, main_f)
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cmp_bolt = run_bolt(cfg.CMP_BOLT, unknownargs + cmp_args, cmp_f, cfg)
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else:
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cmp_bolt = run_bolt(cfg.CMP_BOLT, unknownargs + cmp_args, cmp_f, cfg)
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main_out = wait(main_bolt, main_f)
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cmp_out = wait(cmp_bolt, cmp_f)
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# check exit code
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if main_bolt.returncode != cmp_bolt.returncode:
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print(tmp)
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exit("exitcode mismatch")
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# don't compare output upon unsuccessful exit
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if main_bolt.returncode != 0:
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cfg.SKIP_BINARY_CMP = True
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# compare logs, skip_end=1 skips the line with time
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out = compare_logs(main_out, cmp_out, skip_end=1, str_input=False) if cfg.COMPARE_OUTPUT else None
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if out:
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print(tmp)
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print(fmt_cmp(out))
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write_to(fmt_cmp(out), os.path.join(tmp, 'summary.txt'))
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exit("logs mismatch")
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if os.path.basename(sys.argv[0]) == 'llvm-boltdiff': # boltdiff mode
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# no output binary to compare, so just exit
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clean_exit(tmp, main_out, main_bolt.returncode, cfg)
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# compare binaries (using cmp)
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main_binary = args[args.index('-o')+1]
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cmp_binary = cmp_args[cmp_args.index('-o')+1]
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if main_binary == '/dev/null':
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assert cmp_binary == '/dev/null'
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cfg.SKIP_BINARY_CMP = True
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# report binary timing as csv: output binary; base bolt real; cmp bolt real
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report_real_time(main_binary, main_out, cmp_out, cfg)
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if not cfg.SKIP_BINARY_CMP:
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# check if files exist
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main_exists = os.path.exists(main_binary)
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cmp_exists = os.path.exists(cmp_binary)
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if main_exists and cmp_exists:
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# proceed to comparison
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pass
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elif not main_exists and not cmp_exists:
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# both don't exist, assume it's intended, skip comparison
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clean_exit(tmp, main_out, main_bolt.returncode, cfg)
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elif main_exists:
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assert not cmp_exists
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exit(f"{cmp_binary} doesn't exist")
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else:
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assert not main_exists
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exit(f"{main_binary} doesn't exist")
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cmp_proc = subprocess.run(['cmp', '-b', main_binary, cmp_binary],
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capture_output=True, text=True)
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if cmp_proc.returncode:
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# check if output is an ELF file (magic bytes)
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with open(main_binary, 'rb') as f:
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magic = f.read(4)
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if magic != b'\x7fELF':
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exit("output mismatch")
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# check if ELF headers match
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mismatch, _ = compare_with(main_binary, cmp_binary, 'readelf -We')
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if mismatch:
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print(fmt_cmp(mismatch))
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write_to(fmt_cmp(mismatch), os.path.join(tmp, 'headers.txt'))
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exit("headers mismatch")
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# if headers match, compare sections (skip line with filename)
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mismatch, hdr = compare_with(main_binary, cmp_binary, 'objdump -hw',
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skip_begin=2)
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assert not mismatch
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# check which section has the first mismatch
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mismatch_offset = parse_cmp_offset(cmp_proc.stdout)
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section = find_section(mismatch_offset, hdr)
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exit(f"binary mismatch @{hex(mismatch_offset)} ({section})")
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clean_exit(tmp, main_out, main_bolt.returncode, cfg)
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if __name__ == "__main__":
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# config generator mode if the script is launched as is
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if os.path.basename(__file__) == "llvm-bolt-wrapper.py":
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main_config_generator()
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else:
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# llvm-bolt interceptor mode otherwise
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main()
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