[hwasan] support python3 in hwasan_sanitize

[fmayer]

Summary

Verified no diff exist between previous version, new version python 2, and python 3 for an example stack.

[fmayer]

nits

[fmayer]

restore py2 unicode supp

[fmayer]

formatting

[eugenis]

LGTM

compiler-rt/lib/hwasan/scripts/hwasan_symbolize

 #!/usr/bin/env python
 #===- lib/hwasan/scripts/hwasan_symbolize ----------------------------------===#
 #
 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 # See https:#llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===------------------------------------------------------------------------===#
 #
 # HWAddressSanitizer offline symbolization script.
 #
 #===------------------------------------------------------------------------===#
+
+from __future__ import print_function
+from __future__ import unicode_literals
+
 import glob
 import os
 import re
 import sys
 import string
 import subprocess
 import argparse
 
+if sys.version_info.major < 3:
+  # Simulate Python 3.x behaviour of defaulting to UTF-8 for print. This is
+  # important in case any symbols are non-ASCII.
+  import codecs
+  sys.stdout = codecs.getwriter("utf-8")(sys.stdout)
+
 last_access_address = None
 last_access_tag = None
 
 class Symbolizer:
   def __init__(self, path, binary_prefixes, paths_to_cut):
     self.__pipe = None
     self.__path = path
     self.__binary_prefixes = binary_prefixes
     self.__paths_to_cut = paths_to_cut
     self.__log = False
     self.__warnings = set()
 
   def enable_logging(self, enable):
     self.__log = enable
 
   def __open_pipe(self):
     if not self.__pipe:
+      opt = {}
+      if sys.version_info.major > 2:
+        opt['encoding'] = 'utf-8'
       self.__pipe = subprocess.Popen([self.__path, "--inlining", "--functions"],
-                                     stdin=subprocess.PIPE, stdout=subprocess.PIPE)
+                                     stdin=subprocess.PIPE, stdout=subprocess.PIPE,
+                                     **opt)
 
-  class __EOF:
+  class __EOF(Exception):
     pass
 
   def __write(self, s):
-    print >>self.__pipe.stdin, s
+    print(s, file=self.__pipe.stdin)
+    self.__pipe.stdin.flush()
     if self.__log:
-      print >>sys.stderr, ("#>>  |%s|" % (s,))
+      print("#>>  |%s|" % (s,), file=sys.stderr)
 
   def __read(self):
     s = self.__pipe.stdout.readline().rstrip()
     if self.__log:
-      print >>sys.stderr, ("# << |%s|" % (s,))
+      print("# << |%s|" % (s,), file=sys.stderr)
     if s == '':
       raise Symbolizer.__EOF
     return s
 
   def __process_source_path(self, file_name):
     for path_to_cut in self.__paths_to_cut:
       file_name = re.sub(".*" + path_to_cut, "", file_name)
     file_name = re.sub(".*hwasan_[a-z_]*.(cc|h):[0-9]*", "[hwasan_rtl]", file_name)
for p in self.__binary_prefixes:
       if os.path.exists(full_path):
         return full_path
     # Try stripping extra path components as the last resort.
     for p in self.__binary_prefixes:
       full_path = os.path.join(p, os.path.basename(name))
       if os.path.exists(full_path):
         return full_path
     if name not in self.__warnings:
-      print >>sys.stderr, "Could not find symbols for", name
+      print("Could not find symbols for", name, file=sys.stderr)
       self.__warnings.add(name)
     return None
 
   def iter_locals(self, binary, addr):
     self.__open_pipe()
     p = self.__pipe
     binary = self.__process_binary_name(binary)
     if not binary:
def symbolize_line(line, symbolizer_path):
   if match:
     frameno = match.group(2)
     binary = match.group(5)
     addr = int(match.group(6), 16)
 
     frames = list(symbolizer.iter_call_stack(binary, addr))
 
     if len(frames) > 0:
-      print "%s#%s%s%s in %s" % (match.group(1).encode('utf-8'), match.group(2).encode('utf-8'),
-                                 match.group(3).encode('utf-8'), frames[0][0], frames[0][1])
+      print("%s#%s%s%s in %s" % (match.group(1), match.group(2),
+                                 match.group(3), frames[0][0], frames[0][1]))
       for i in range(1, len(frames)):
         space1 = ' ' * match.end(1)
         space2 = ' ' * (match.start(4) - match.end(1) - 2)
-        print "%s->%s%s in %s" % (space1, space2, frames[i][0], frames[i][1])
+        print("%s->%s%s in %s" % (space1, space2, frames[i][0], frames[i][1]))
     else:
-      print line.rstrip().encode('utf-8')
+      print(line.rstrip())
   else:
-    print line.rstrip().encode('utf-8')
+    print(line.rstrip())
 
 def save_access_address(line):
   global last_access_address, last_access_tag
   match = re.match(r'^(.*?)HWAddressSanitizer: tag-mismatch on address (0x[0-9a-f]+) ', line, re.UNICODE)
   if match:
     last_access_address = int(match.group(2), 16)
   match = re.match(r'^(.*?) of size [0-9]+ at 0x[0-9a-f]* tags: ([0-9a-f]+)/[0-9a-f]+ \(ptr/mem\)', line, re.UNICODE)
   if match:
for local in symbolizer.iter_locals(binary, addr):
       if frame_offset is None or size is None:
         continue
       obj_offset = (last_access_address - fp - frame_offset) & fp_mask
       if obj_offset >= size:
         continue
       tag_offset = local[5]
       if not ignore_tags and (tag_offset is None or base_tag ^ tag_offset != last_access_tag):
         continue
-      print ''
-      print 'Potentially referenced stack object:'
-      print '  %d bytes inside variable "%s" in stack frame of function "%s"' % (obj_offset, local[2], local[0])
-      print '  at %s' % (local[1],)
+      print('')
+      print('Potentially referenced stack object:')
+      print('  %d bytes inside variable "%s" in stack frame of function "%s"' % (obj_offset, local[2], local[0]))
+      print('  at %s' % (local[1],))
     return True
   return False
 
 parser = argparse.ArgumentParser()
 parser.add_argument('-d', action='store_true')
 parser.add_argument('-v', action='store_true')
 parser.add_argument('--ignore-tags', action='store_true')
 parser.add_argument('--symbols', action='append')
 parser.add_argument('--source', action='append')
 parser.add_argument('--symbolizer')
 parser.add_argument('args', nargs=argparse.REMAINDER)
 args = parser.parse_args()
 
 # Unstripped binaries location.
 binary_prefixes = args.symbols or []
 if not binary_prefixes:
   if 'ANDROID_PRODUCT_OUT' in os.environ:
     product_out = os.path.join(os.environ['ANDROID_PRODUCT_OUT'], 'symbols')
     binary_prefixes.append(product_out)
   binary_prefixes.append('/')
 
 for p in binary_prefixes:
   if not os.path.isdir(p):
-    print >>sys.stderr, "Symbols path does not exist or is not a directory:", p
+    print("Symbols path does not exist or is not a directory:", p, file=sys.stderr)
     sys.exit(1)
 
 # Source location.
 paths_to_cut = args.source or []
 if not paths_to_cut:
   paths_to_cut.append(os.getcwd() + '/')
   if 'ANDROID_BUILD_TOP' in os.environ:
     paths_to_cut.append(os.environ['ANDROID_BUILD_TOP'] + '/')
if not symbolizer_path:
   for path in os.environ["PATH"].split(os.pathsep):
     candidates = glob.glob(os.path.join(path, 'llvm-symbolizer-*'))
     if len(candidates) > 0:
       candidates.sort(key = extract_version, reverse = True)
       symbolizer_path = candidates[0]
       break
 
 if not os.path.exists(symbolizer_path):
-  print >>sys.stderr, "Symbolizer path does not exist:", symbolizer_path
+  print("Symbolizer path does not exist:", symbolizer_path, file=sys.stderr)
   sys.exit(1)
 
 if args.v:
-  print "Looking for symbols in:"
+  print("Looking for symbols in:")
   for s in binary_prefixes:
-    print "  %s" % (s,)
-  print "Stripping source path prefixes:"
+    print("  %s" % (s,))
+  print("Stripping source path prefixes:")
   for s in paths_to_cut:
-    print "  %s" % (s,)
-  print "Using llvm-symbolizer binary in:\n  %s" % (symbolizer_path,)
-  print
+    print("  %s" % (s,))
+  print("Using llvm-symbolizer binary in:\n  %s" % (symbolizer_path,))
+  print()
 
 symbolizer = Symbolizer(symbolizer_path, binary_prefixes, paths_to_cut)
 symbolizer.enable_logging(args.d)
 
 for line in sys.stdin:
+  if sys.version_info.major < 3:
     line = line.decode('utf-8')
   save_access_address(line)
   if process_stack_history(line, symbolizer, ignore_tags=args.ignore_tags):
     continue
   symbolize_line(line, symbolizer_path)