Add a utility script to stress test the demangler.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@341120 91177308-0d34-0410-b5e6-96231b3b80d8

utils/demangle_tree.py

@@ -0,0 +1,226 @@
+# Given a path to llvm-objdump and a directory tree, spider the directory tree
+# dumping every object file encountered with correct options needed to demangle
+# symbols in the object file, and collect statistics about failed / crashed
+# demanglings.  Useful for stress testing the demangler against a large corpus
+# of inputs.
+
+import argparse
+import functools
+import os
+import re
+import sys
+import subprocess
+import traceback
+from multiprocessing import Pool
+import multiprocessing
+
+args = None
+
+def parse_line(line):
+    question = line.find('?')
+    if question == -1:
+        return None, None
+
+    open_paren = line.find('(', question)
+    if open_paren == -1:
+        return None, None
+    close_paren = line.rfind(')', open_paren)
+    if open_paren == -1:
+        return None, None
+    mangled = line[question : open_paren]
+    demangled = line[open_paren+1 : close_paren]
+    return mangled.strip(), demangled.strip()
+
+class Result(object):
+    def __init__(self):
+        self.crashed = []
+        self.file = None
+        self.nsymbols = 0
+        self.errors = set()
+        self.nfiles = 0
+
+class MapContext(object):
+    def __init__(self):
+        self.rincomplete = None
+        self.rcumulative = Result()
+        self.pending_objs = []
+        self.npending = 0
+
+def process_file(path, objdump):
+    r = Result()
+    r.file = path
+
+    popen_args = [objdump, '-t', '-demangle', path]
+    p = subprocess.Popen(popen_args, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    stdout, stderr = p.communicate()
+    if p.returncode != 0:
+        r.crashed = [r.file]
+        return r
+
+    output = stdout.decode('utf-8')
+
+    for line in output.splitlines():
+        mangled, demangled = parse_line(line)
+        if mangled is None:
+            continue
+        r.nsymbols += 1
+        if "invalid mangled name" in demangled:
+            r.errors.add(mangled)
+    return r
+
+def add_results(r1, r2):
+    r1.crashed.extend(r2.crashed)
+    r1.errors.update(r2.errors)
+    r1.nsymbols += r2.nsymbols
+    r1.nfiles += r2.nfiles
+
+def print_result_row(directory, result):
+    print("[{0} files, {1} crashes, {2} errors, {3} symbols]: '{4}'".format(
+        result.nfiles, len(result.crashed), len(result.errors), result.nsymbols, directory))
+
+def process_one_chunk(pool, chunk_size, objdump, context):
+    objs = []
+
+    incomplete = False
+    dir_results = {}
+    ordered_dirs = []
+    while context.npending > 0 and len(objs) < chunk_size:
+        this_dir = context.pending_objs[0][0]
+        ordered_dirs.append(this_dir)
+        re = Result()
+        if context.rincomplete is not None:
+            re = context.rincomplete
+            context.rincomplete = None
+
+        dir_results[this_dir] = re
+        re.file = this_dir
+
+        nneeded = chunk_size - len(objs)
+        objs_this_dir = context.pending_objs[0][1]
+        navail = len(objs_this_dir)
+        ntaken = min(nneeded, navail)
+        objs.extend(objs_this_dir[0:ntaken])
+        remaining_objs_this_dir = objs_this_dir[ntaken:]
+        context.pending_objs[0] = (context.pending_objs[0][0], remaining_objs_this_dir)
+        context.npending -= ntaken
+        if ntaken == navail:
+            context.pending_objs.pop(0)
+        else:
+            incomplete = True
+
+        re.nfiles += ntaken
+
+    assert(len(objs) == chunk_size or context.npending == 0)
+
+    copier = functools.partial(process_file, objdump=objdump)
+    mapped_results = list(pool.map(copier, objs))
+
+    for mr in mapped_results:
+        result_dir = os.path.dirname(mr.file)
+        result_entry = dir_results[result_dir]
+        add_results(result_entry, mr)
+
+    # It's only possible that a single item is incomplete, and it has to be the
+    # last item.
+    if incomplete:
+        context.rincomplete = dir_results[ordered_dirs[-1]]
+        ordered_dirs.pop()
+
+    # Now ordered_dirs contains a list of all directories which *did* complete.
+    for c in ordered_dirs:
+        re = dir_results[c]
+        add_results(context.rcumulative, re)
+        print_result_row(c, re)
+
+def process_pending_files(pool, chunk_size, objdump, context):
+    while context.npending >= chunk_size:
+        process_one_chunk(pool, chunk_size, objdump, context)
+
+def go():
+    global args
+
+    obj_dir = args.dir
+    extensions = args.extensions.split(',')
+    extensions = [x if x[0] == '.' else '.' + x for x in extensions]
+
+
+    pool_size = 48
+    pool = Pool(processes=pool_size)
+
+    try:
+        nfiles = 0
+        context = MapContext()
+
+        for root, dirs, files in os.walk(obj_dir):
+            root = os.path.normpath(root)
+            pending = []
+            for f in files:
+                file, ext = os.path.splitext(f)
+                if not ext in extensions:
+                    continue
+
+                nfiles += 1
+                full_path = os.path.join(root, f)
+                full_path = os.path.normpath(full_path)
+                pending.append(full_path)
+
+            # If this directory had no object files, just print a default
+            # status line and continue with the next dir
+            if len(pending) == 0:
+                print_result_row(root, Result())
+                continue
+
+            context.npending += len(pending)
+            context.pending_objs.append((root, pending))
+            # Drain the tasks, `pool_size` at a time, until we have less than
+            # `pool_size` tasks remaining.
+            process_pending_files(pool, pool_size, args.objdump, context)
+
+        assert(context.npending < pool_size);
+        process_one_chunk(pool, pool_size, args.objdump, context)
+
+        total = context.rcumulative
+        nfailed = len(total.errors)
+        nsuccess = total.nsymbols - nfailed
+        ncrashed = len(total.crashed)
+
+        if (nfailed > 0):
+            print("Failures:")
+            for m in sorted(total.errors):
+                print("  " + m)
+        if (ncrashed > 0):
+            print("Crashes:")
+            for f in sorted(total.crashed):
+                print("  " + f)
+        print("Summary:")
+        spct = float(nsuccess)/float(total.nsymbols)
+        fpct = float(nfailed)/float(total.nsymbols)
+        cpct = float(ncrashed)/float(nfiles)
+        print("Processed {0} object files.".format(nfiles))
+        print("{0}/{1} symbols successfully demangled ({2:.4%})".format(nsuccess, total.nsymbols, spct))
+        print("{0} symbols could not be demangled ({1:.4%})".format(nfailed, fpct))
+        print("{0} files crashed while demangling ({1:.4%})".format(ncrashed, cpct))
+            
+    except:
+        traceback.print_exc()
+
+    pool.close()
+    pool.join()
+
+if __name__ == "__main__":
+    def_obj = 'obj' if sys.platform == 'win32' else 'o'
+
+    parser = argparse.ArgumentParser(description='Demangle all symbols in a tree of object files, looking for failures.')
+    parser.add_argument('dir', type=str, help='the root directory at which to start crawling')
+    parser.add_argument('--objdump', type=str, help='path to llvm-objdump.  If not specified ' +
+                        'the tool is located as if by `which llvm-objdump`.')
+    parser.add_argument('--extensions', type=str, default=def_obj,
+                        help='comma separated list of extensions to demangle (e.g. `o,obj`).  ' +
+                        'By default this will be `obj` on Windows and `o` otherwise.')
+
+    args = parser.parse_args()
+
+
+    multiprocessing.freeze_support()
+    go()
+