forked from OSchip/llvm-project
386 lines
12 KiB
Python
Executable File
386 lines
12 KiB
Python
Executable File
#!/usr/bin/env python
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#
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# Given a previous good compile narrow down miscompiles.
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# Expects two directories named "before" and "after" each containing a set of
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# assembly or object files where the "after" version is assumed to be broken.
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# You also have to provide a script called "link_test". It is called with a
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# list of files which should be linked together and result tested. "link_test"
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# should returns with exitcode 0 if the linking and testing succeeded.
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#
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# abtest.py operates by taking all files from the "before" directory and
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# in each step replacing one of them with a file from the "bad" directory.
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#
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# Additionally you can perform the same steps with a single .s file. In this
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# mode functions are identified by " -- Begin function FunctionName" and
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# " -- End function" markers. The abtest.py then takes all
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# function from the file in the "before" directory and replaces one function
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# with the corresponding function from the "bad" file in each step.
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#
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# Example usage to identify miscompiled files:
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# 1. Create a link_test script, make it executable. Simple Example:
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# clang "$@" -o /tmp/test && /tmp/test || echo "PROBLEM"
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# 2. Run the script to figure out which files are miscompiled:
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# > ./abtest.py
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# somefile.s: ok
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# someotherfile.s: skipped: same content
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# anotherfile.s: failed: './link_test' exitcode != 0
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# ...
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# Example usage to identify miscompiled functions inside a file:
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# 3. Run the tests on a single file (assuming before/file.s and
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# after/file.s exist)
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# > ./abtest.py file.s
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# funcname1 [0/XX]: ok
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# funcname2 [1/XX]: ok
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# funcname3 [2/XX]: skipped: same content
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# funcname4 [3/XX]: failed: './link_test' exitcode != 0
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# ...
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from fnmatch import filter
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from sys import stderr
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import argparse
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import filecmp
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import os
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import subprocess
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import sys
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LINKTEST = "./link_test"
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ESCAPE = "\033[%sm"
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BOLD = ESCAPE % "1"
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RED = ESCAPE % "31"
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NORMAL = ESCAPE % "0"
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FAILED = RED + "failed" + NORMAL
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def find(dir, file_filter=None):
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files = [
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walkdir[0]+"/"+file
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for walkdir in os.walk(dir)
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for file in walkdir[2]
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]
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if file_filter is not None:
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files = filter(files, file_filter)
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return sorted(files)
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def error(message):
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stderr.write("Error: %s\n" % (message,))
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def warn(message):
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stderr.write("Warning: %s\n" % (message,))
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def info(message):
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stderr.write("Info: %s\n" % (message,))
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def announce_test(name):
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stderr.write("%s%s%s: " % (BOLD, name, NORMAL))
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stderr.flush()
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def announce_result(result):
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stderr.write(result)
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stderr.write("\n")
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stderr.flush()
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def format_namelist(l):
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result = ", ".join(l[0:3])
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if len(l) > 3:
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result += "... (%d total)" % len(l)
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return result
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def check_sanity(choices, perform_test):
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announce_test("sanity check A")
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all_a = {name: a_b[0] for name, a_b in choices}
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res_a = perform_test(all_a)
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if res_a is not True:
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error("Picking all choices from A failed to pass the test")
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sys.exit(1)
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announce_test("sanity check B (expecting failure)")
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all_b = {name: a_b[1] for name, a_b in choices}
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res_b = perform_test(all_b)
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if res_b is not False:
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error("Picking all choices from B did unexpectedly pass the test")
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sys.exit(1)
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def check_sequentially(choices, perform_test):
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known_good = set()
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all_a = {name: a_b[0] for name, a_b in choices}
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n = 1
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for name, a_b in sorted(choices):
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picks = dict(all_a)
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picks[name] = a_b[1]
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announce_test("checking %s [%d/%d]" % (name, n, len(choices)))
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n += 1
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res = perform_test(picks)
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if res is True:
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known_good.add(name)
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return known_good
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def check_bisect(choices, perform_test):
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known_good = set()
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if len(choices) == 0:
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return known_good
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choice_map = dict(choices)
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all_a = {name: a_b[0] for name, a_b in choices}
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def test_partition(partition, upcoming_partition):
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# Compute the maximum number of checks we have to do in the worst case.
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max_remaining_steps = len(partition) * 2 - 1
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if upcoming_partition is not None:
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max_remaining_steps += len(upcoming_partition) * 2 - 1
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for x in partitions_to_split:
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max_remaining_steps += (len(x) - 1) * 2
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picks = dict(all_a)
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for x in partition:
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picks[x] = choice_map[x][1]
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announce_test("checking %s [<=%d remaining]" %
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(format_namelist(partition), max_remaining_steps))
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res = perform_test(picks)
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if res is True:
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known_good.update(partition)
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elif len(partition) > 1:
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partitions_to_split.insert(0, partition)
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# TODO:
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# - We could optimize based on the knowledge that when splitting a failed
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# partition into two and one side checks out okay then we can deduce that
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# the other partition must be a failure.
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all_choice_names = [name for name, _ in choices]
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partitions_to_split = [all_choice_names]
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while len(partitions_to_split) > 0:
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partition = partitions_to_split.pop()
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middle = len(partition) // 2
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left = partition[0:middle]
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right = partition[middle:]
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if len(left) > 0:
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test_partition(left, right)
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assert len(right) > 0
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test_partition(right, None)
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return known_good
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def extract_functions(file):
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functions = []
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in_function = None
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for line in open(file):
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marker = line.find(" -- Begin function ")
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if marker != -1:
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if in_function is not None:
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warn("Missing end of function %s" % (in_function,))
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funcname = line[marker + 19:-1]
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in_function = funcname
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text = line
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continue
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marker = line.find(" -- End function")
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if marker != -1:
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text += line
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functions.append((in_function, text))
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in_function = None
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continue
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if in_function is not None:
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text += line
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return functions
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def replace_functions(source, dest, replacements):
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out = open(dest, "w")
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skip = False
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in_function = None
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for line in open(source):
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marker = line.find(" -- Begin function ")
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if marker != -1:
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if in_function is not None:
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warn("Missing end of function %s" % (in_function,))
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funcname = line[marker + 19:-1]
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in_function = funcname
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replacement = replacements.get(in_function)
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if replacement is not None:
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out.write(replacement)
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skip = True
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else:
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marker = line.find(" -- End function")
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if marker != -1:
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in_function = None
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if skip:
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skip = False
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continue
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if not skip:
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out.write(line)
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def testrun(files):
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linkline = "%s %s" % (LINKTEST, " ".join(files),)
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res = subprocess.call(linkline, shell=True)
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if res != 0:
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announce_result(FAILED + ": '%s' exitcode != 0" % LINKTEST)
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return False
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else:
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announce_result("ok")
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return True
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def prepare_files(gooddir, baddir):
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files_a = find(gooddir, "*")
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files_b = find(baddir, "*")
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basenames_a = set(map(os.path.basename, files_a))
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basenames_b = set(map(os.path.basename, files_b))
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for name in files_b:
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basename = os.path.basename(name)
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if basename not in basenames_a:
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warn("There is no corresponding file to '%s' in %s" %
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(name, gooddir))
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choices = []
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skipped = []
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for name in files_a:
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basename = os.path.basename(name)
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if basename not in basenames_b:
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warn("There is no corresponding file to '%s' in %s" %
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(name, baddir))
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file_a = gooddir + "/" + basename
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file_b = baddir + "/" + basename
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if filecmp.cmp(file_a, file_b):
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skipped.append(basename)
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continue
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choice = (basename, (file_a, file_b))
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choices.append(choice)
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if len(skipped) > 0:
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info("Skipped (same content): %s" % format_namelist(skipped))
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def perform_test(picks):
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files = []
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# Note that we iterate over files_a so we don't change the order
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# (cannot use `picks` as it is a dictionary without order)
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for x in files_a:
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basename = os.path.basename(x)
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picked = picks.get(basename)
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if picked is None:
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assert basename in skipped
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files.append(x)
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else:
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files.append(picked)
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return testrun(files)
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return perform_test, choices
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def prepare_functions(to_check, gooddir, goodfile, badfile):
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files_good = find(gooddir, "*")
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functions_a = extract_functions(goodfile)
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functions_a_map = dict(functions_a)
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functions_b_map = dict(extract_functions(badfile))
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for name in functions_b_map.keys():
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if name not in functions_a_map:
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warn("Function '%s' missing from good file" % name)
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choices = []
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skipped = []
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for name, candidate_a in functions_a:
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candidate_b = functions_b_map.get(name)
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if candidate_b is None:
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warn("Function '%s' missing from bad file" % name)
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continue
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if candidate_a == candidate_b:
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skipped.append(name)
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continue
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choice = name, (candidate_a, candidate_b)
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choices.append(choice)
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if len(skipped) > 0:
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info("Skipped (same content): %s" % format_namelist(skipped))
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combined_file = '/tmp/combined2.s'
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files = []
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found_good_file = False
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for c in files_good:
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if os.path.basename(c) == to_check:
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found_good_file = True
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files.append(combined_file)
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continue
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files.append(c)
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assert found_good_file
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def perform_test(picks):
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for name, x in picks.items():
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assert x == functions_a_map[name] or x == functions_b_map[name]
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replace_functions(goodfile, combined_file, picks)
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return testrun(files)
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return perform_test, choices
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def main():
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parser = argparse.ArgumentParser()
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parser.add_argument('--a', dest='dir_a', default='before')
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parser.add_argument('--b', dest='dir_b', default='after')
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parser.add_argument('--insane', help='Skip sanity check',
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action='store_true')
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parser.add_argument('--seq',
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help='Check sequentially instead of bisection',
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action='store_true')
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parser.add_argument('file', metavar='file', nargs='?')
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config = parser.parse_args()
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gooddir = config.dir_a
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baddir = config.dir_b
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# Preparation phase: Creates a dictionary mapping names to a list of two
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# choices each. The bisection algorithm will pick one choice for each name
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# and then run the perform_test function on it.
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if config.file is not None:
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goodfile = gooddir + "/" + config.file
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badfile = baddir + "/" + config.file
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perform_test, choices = prepare_functions(config.file, gooddir,
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goodfile, badfile)
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else:
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perform_test, choices = prepare_files(gooddir, baddir)
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info("%d bisection choices" % len(choices))
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# "Checking whether build environment is sane ..."
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if not config.insane:
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if not os.access(LINKTEST, os.X_OK):
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error("Expect '%s' to be present and executable" % (LINKTEST,))
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exit(1)
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check_sanity(choices, perform_test)
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if config.seq:
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known_good = check_sequentially(choices, perform_test)
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else:
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known_good = check_bisect(choices, perform_test)
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stderr.write("")
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if len(known_good) != len(choices):
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stderr.write("== Failing ==\n")
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for name, _ in choices:
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if name not in known_good:
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stderr.write("%s\n" % name)
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else:
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# This shouldn't happen when the sanity check works...
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# Maybe link_test isn't deterministic?
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stderr.write("Could not identify failing parts?!?")
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if __name__ == '__main__':
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main()
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