| #!/usr/bin/env python |
| |
| # Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. |
| # |
| # Use of this source code is governed by a BSD-style license |
| # that can be found in the LICENSE file in the root of the source |
| # tree. An additional intellectual property rights grant can be found |
| # in the file PATENTS. All contributing project authors may |
| # be found in the AUTHORS file in the root of the source tree. |
| |
| """Given the output of -t commands from a ninja build for a gyp and GN generated |
| build, report on differences between the command lines. |
| |
| |
| When invoked from the command line, this script assumes that the GN and GYP |
| targets have been generated in the specified folders. It is meant to be used as |
| follows: |
| $ python tools/gyp_flag_compare.py gyp_dir gn_dir target |
| |
| When the GN and GYP target names differ, it should be called invoked as follows: |
| $ python tools/gyp_flag_compare.py gyp_dir gn_dir gyp_target gn_target |
| |
| |
| This script can also be used interactively. Then ConfigureBuild can optionally |
| be used to generate ninja files with GYP and GN. |
| Here's an example setup. Note that the current working directory must be the |
| project root: |
| $ PYTHONPATH=tools python |
| >>> import sys |
| >>> import pprint |
| >>> sys.displayhook = pprint.pprint |
| >>> import gyp_flag_compare as fc |
| >>> fc.ConfigureBuild(['gyp_define=1', 'define=2'], ['gn_arg=1', 'arg=2']) |
| >>> modules_unittests = fc.Comparison('modules_unittests') |
| |
| The above starts interactive Python, sets up the output to be pretty-printed |
| (useful for making lists, dicts, and sets readable), configures the build with |
| GN arguments and GYP defines, and then generates a comparison for that build |
| configuration for the "modules_unittests" target. |
| |
| After that, the |modules_unittests| object can be used to investigate |
| differences in the build. |
| |
| To configure an official build, use this configuration. Disabling NaCl produces |
| a more meaningful comparison, as certain files need to get compiled twice |
| for the IRT build, which uses different flags: |
| >>> fc.ConfigureBuild( |
| ['disable_nacl=1', 'buildtype=Official', 'branding=Chrome'], |
| ['enable_nacl=false', 'is_official_build=true', |
| 'is_chrome_branded=true']) |
| """ |
| |
| |
| import os |
| import shlex |
| import subprocess |
| import sys |
| |
| # Must be in src/. |
| BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__))) |
| os.chdir(BASE_DIR) |
| |
| _DEFAULT_GN_DIR = 'out/gn' |
| _DEFAULT_GYP_DIR = 'out/Release' |
| |
| |
| def FilterChromium(filename): |
| """Replaces 'chromium/src/' by '' in the filename.""" |
| return filename.replace('chromium/src/', '') |
| |
| |
| def ConfigureBuild(gyp_args=None, gn_args=None, gn_dir=_DEFAULT_GN_DIR): |
| """Generates gn and gyp targets with the given arguments.""" |
| gyp_args = gyp_args or [] |
| gn_args = gn_args or [] |
| |
| print >> sys.stderr, 'Regenerating GN in %s...' % gn_dir |
| # Currently only Release, non-component. |
| Run('gn gen %s --args="is_debug=false is_component_build=false %s"' % \ |
| (gn_dir, ' '.join(gn_args))) |
| |
| os.environ.pop('GYP_DEFINES', None) |
| # Remove environment variables required by gn but conflicting with GYP. |
| # Relevant if Windows toolchain isn't provided by depot_tools. |
| os.environ.pop('GYP_MSVS_OVERRIDE_PATH', None) |
| os.environ.pop('WINDOWSSDKDIR', None) |
| |
| gyp_defines = '' |
| if len(gyp_args) > 0: |
| gyp_defines = '-D' + ' -D'.join(gyp_args) |
| |
| print >> sys.stderr, 'Regenerating GYP in %s...' % _DEFAULT_GYP_DIR |
| Run('python webrtc/build/gyp_webrtc.py -Gconfig=Release %s' % gyp_defines) |
| |
| |
| def Counts(dict_of_list): |
| """Given a dictionary whose value are lists, returns a dictionary whose values |
| are the length of the list. This can be used to summarize a dictionary. |
| """ |
| return {k: len(v) for k, v in dict_of_list.iteritems()} |
| |
| |
| def CountsByDirname(dict_of_list): |
| """Given a list of files, returns a dict of dirname to counts in that dir.""" |
| r = {} |
| for path in dict_of_list: |
| dirname = os.path.dirname(path) |
| r.setdefault(dirname, 0) |
| r[dirname] += 1 |
| return r |
| |
| |
| class Comparison(object): |
| """A comparison of the currently-configured build for a target.""" |
| |
| def __init__(self, gyp_target, gn_target=None, gyp_dir=_DEFAULT_GYP_DIR, |
| gn_dir=_DEFAULT_GN_DIR): |
| """Creates a comparison of a GN and GYP target. If the target names differ |
| between the two build systems, then two names may be passed. |
| """ |
| if gn_target is None: |
| gn_target = gyp_target |
| self._gyp_target = gyp_target |
| self._gn_target = gn_target |
| |
| self._gyp_dir = gyp_dir |
| self._gn_dir = gn_dir |
| |
| self._skipped = [] |
| |
| self._total_diffs = 0 |
| |
| self._missing_gyp_flags = {} |
| self._missing_gn_flags = {} |
| |
| self._missing_gyp_files = {} |
| self._missing_gn_files = {} |
| |
| self._CompareFiles() |
| |
| @property |
| def gyp_files(self): |
| """Returns the set of files that are in the GYP target.""" |
| return set(self._gyp_flags.keys()) |
| |
| @property |
| def gn_files(self): |
| """Returns the set of files that are in the GN target.""" |
| return set(self._gn_flags.keys()) |
| |
| @property |
| def skipped(self): |
| """Returns the list of compiler commands that were not processed during the |
| comparison. |
| """ |
| return self._skipped |
| |
| @property |
| def total_differences(self): |
| """Returns the total number of differences detected.""" |
| return self._total_diffs |
| |
| @property |
| def missing_in_gyp(self): |
| """Differences that are only in GYP build but not in GN, indexed by the |
| difference.""" |
| return self._missing_gyp_flags |
| |
| @property |
| def missing_in_gn(self): |
| """Differences that are only in the GN build but not in GYP, indexed by |
| the difference.""" |
| return self._missing_gn_flags |
| |
| @property |
| def missing_in_gyp_by_file(self): |
| """Differences that are only in the GYP build but not in GN, indexed by |
| file. |
| """ |
| return self._missing_gyp_files |
| |
| @property |
| def missing_in_gn_by_file(self): |
| """Differences that are only in the GYP build but not in GN, indexed by |
| file. |
| """ |
| return self._missing_gn_files |
| |
| def _CompareFiles(self): |
| """Performs the actual target comparison.""" |
| if sys.platform == 'win32': |
| # On Windows flags are stored in .rsp files which are created by building. |
| print >> sys.stderr, 'Building in %s...' % self._gn_dir |
| Run('ninja -C %s -d keeprsp %s' % (self._gn_dir, self._gn_target)) |
| print >> sys.stderr, 'Building in %s...' % self._gyp_dir |
| Run('ninja -C %s -d keeprsp %s' % (self._gyp_dir, self._gn_target)) |
| |
| gn = Run('ninja -C %s -t commands %s' % (self._gn_dir, self._gn_target)) |
| gyp = Run('ninja -C %s -t commands %s' % (self._gyp_dir, self._gyp_target)) |
| |
| self._gn_flags = self._GetFlags(gn.splitlines(), |
| os.path.join(os.getcwd(), self._gn_dir)) |
| self._gyp_flags = self._GetFlags(gyp.splitlines(), |
| os.path.join(os.getcwd(), self._gyp_dir)) |
| |
| self._gn_flags = dict((FilterChromium(filename), value) |
| for filename, value in self._gn_flags.iteritems()) |
| self._gyp_flags = dict((FilterChromium(filename), value) |
| for filename, value in self._gyp_flags.iteritems()) |
| |
| all_files = sorted(self.gn_files & self.gyp_files) |
| for filename in all_files: |
| gyp_flags = self._gyp_flags[filename] |
| gn_flags = self._gn_flags[filename] |
| self._CompareLists(filename, gyp_flags, gn_flags, 'dash_f') |
| self._CompareLists(filename, gyp_flags, gn_flags, 'defines') |
| self._CompareLists(filename, gyp_flags, gn_flags, 'include_dirs') |
| self._CompareLists(filename, gyp_flags, gn_flags, 'warnings', |
| # More conservative warnings in GN we consider to be OK. |
| dont_care_gyp=[ |
| '/wd4091', # 'keyword' : ignored on left of 'type' when no variable |
| # is declared. |
| '/wd4456', # Declaration hides previous local declaration. |
| '/wd4457', # Declaration hides function parameter. |
| '/wd4458', # Declaration hides class member. |
| '/wd4459', # Declaration hides global declaration. |
| '/wd4702', # Unreachable code. |
| '/wd4800', # Forcing value to bool 'true' or 'false'. |
| '/wd4838', # Conversion from 'type' to 'type' requires a narrowing |
| # conversion. |
| ] if sys.platform == 'win32' else None, |
| dont_care_gn=[ |
| '-Wendif-labels', |
| '-Wextra', |
| '-Wsign-compare', |
| ] if not sys.platform == 'win32' else None) |
| self._CompareLists(filename, gyp_flags, gn_flags, 'other') |
| |
| def _CompareLists(self, filename, gyp, gn, name, |
| dont_care_gyp=None, dont_care_gn=None): |
| """Return a report of any differences between gyp and gn lists, ignoring |
| anything in |dont_care_{gyp|gn}| respectively.""" |
| if gyp[name] == gn[name]: |
| return |
| if not dont_care_gyp: |
| dont_care_gyp = [] |
| if not dont_care_gn: |
| dont_care_gn = [] |
| gyp_set = set(gyp[name]) |
| gn_set = set(gn[name]) |
| missing_in_gyp = gyp_set - gn_set |
| missing_in_gn = gn_set - gyp_set |
| missing_in_gyp -= set(dont_care_gyp) |
| missing_in_gn -= set(dont_care_gn) |
| |
| for m in missing_in_gyp: |
| self._missing_gyp_flags.setdefault(name, {}) \ |
| .setdefault(m, []).append(filename) |
| self._total_diffs += 1 |
| self._missing_gyp_files.setdefault(filename, {}) \ |
| .setdefault(name, set()).update(missing_in_gyp) |
| |
| for m in missing_in_gn: |
| self._missing_gn_flags.setdefault(name, {}) \ |
| .setdefault(m, []).append(filename) |
| self._total_diffs += 1 |
| self._missing_gn_files.setdefault(filename, {}) \ |
| .setdefault(name, set()).update(missing_in_gn) |
| |
| def _GetFlags(self, lines, build_dir): |
| """Turn a list of command lines into a semi-structured dict.""" |
| is_win = sys.platform == 'win32' |
| flags_by_output = {} |
| for line in lines: |
| command_line = shlex.split(line.strip(), posix=not is_win)[1:] |
| |
| output_name = _FindAndRemoveArgWithValue(command_line, '-o') |
| dep_name = _FindAndRemoveArgWithValue(command_line, '-MF') |
| |
| command_line = _MergeSpacedArgs(command_line, '-Xclang') |
| |
| cc_file = [x for x in command_line if x.endswith('.cc') or |
| x.endswith('.c') or |
| x.endswith('.cpp') or |
| x.endswith('.mm') or |
| x.endswith('.m')] |
| if len(cc_file) != 1: |
| self._skipped.append(command_line) |
| continue |
| assert len(cc_file) == 1 |
| |
| if is_win: |
| rsp_file = [x for x in command_line if x.endswith('.rsp')] |
| assert len(rsp_file) <= 1 |
| if rsp_file: |
| rsp_file = os.path.join(build_dir, rsp_file[0][1:]) |
| with open(rsp_file, "r") as open_rsp_file: |
| command_line = shlex.split(open_rsp_file, posix=False) |
| |
| defines = [x for x in command_line if x.startswith('-D')] |
| include_dirs = [x for x in command_line if x.startswith('-I')] |
| dash_f = [x for x in command_line if x.startswith('-f')] |
| warnings = \ |
| [x for x in command_line if x.startswith('/wd' if is_win else '-W')] |
| others = [x for x in command_line if x not in defines and \ |
| x not in include_dirs and \ |
| x not in dash_f and \ |
| x not in warnings and \ |
| x not in cc_file] |
| |
| for index, value in enumerate(include_dirs): |
| if value == '-Igen': |
| continue |
| path = value[2:] |
| if not os.path.isabs(path): |
| path = os.path.join(build_dir, path) |
| include_dirs[index] = '-I' + os.path.normpath(path) |
| |
| # GYP supports paths above the source root like <(DEPTH)/../foo while such |
| # paths are unsupported by gn. But gn allows to use system-absolute paths |
| # instead (paths that start with single '/'). Normalize all paths. |
| cc_file = [os.path.normpath(os.path.join(build_dir, cc_file[0]))] |
| |
| # Filter for libFindBadConstructs.so having a relative path in one and |
| # absolute path in the other. |
| others_filtered = [] |
| for x in others: |
| if x.startswith('-Xclang ') and \ |
| (x.endswith('libFindBadConstructs.so') or \ |
| x.endswith('libFindBadConstructs.dylib')): |
| others_filtered.append( |
| '-Xclang ' + |
| os.path.join(os.getcwd(), os.path.normpath( |
| os.path.join('out/gn_flags', x.split(' ', 1)[1])))) |
| elif x.startswith('-B'): |
| others_filtered.append( |
| '-B' + |
| os.path.join(os.getcwd(), os.path.normpath( |
| os.path.join('out/gn_flags', x[2:])))) |
| else: |
| others_filtered.append(x) |
| others = others_filtered |
| |
| flags_by_output[cc_file[0]] = { |
| 'output': output_name, |
| 'depname': dep_name, |
| 'defines': sorted(defines), |
| 'include_dirs': sorted(include_dirs), # TODO(scottmg): This is wrong. |
| 'dash_f': sorted(dash_f), |
| 'warnings': sorted(warnings), |
| 'other': sorted(others), |
| } |
| return flags_by_output |
| |
| |
| def _FindAndRemoveArgWithValue(command_line, argname): |
| """Given a command line as a list, remove and return the value of an option |
| that takes a value as a separate entry. |
| |
| Modifies |command_line| in place. |
| """ |
| if argname not in command_line: |
| return '' |
| location = command_line.index(argname) |
| value = command_line[location + 1] |
| command_line[location:location + 2] = [] |
| return value |
| |
| |
| def _MergeSpacedArgs(command_line, argname): |
| """Combine all arguments |argname| with their values, separated by a space.""" |
| i = 0 |
| result = [] |
| while i < len(command_line): |
| arg = command_line[i] |
| if arg == argname: |
| result.append(arg + ' ' + command_line[i + 1]) |
| i += 1 |
| else: |
| result.append(arg) |
| i += 1 |
| return result |
| |
| |
| def Run(command_line): |
| """Run |command_line| as a subprocess and return stdout. Raises on error.""" |
| print >> sys.stderr, command_line |
| return subprocess.check_output(command_line, shell=True) |
| |
| |
| def main(): |
| if len(sys.argv) < 4: |
| print 'usage: %s gyp_dir gn_dir target' % __file__ |
| print ' or: %s gyp_dir gn_dir gyp_target gn_target' % __file__ |
| return 1 |
| |
| gyp_dir = sys.argv[1] |
| gn_dir = sys.argv[2] |
| |
| gyp_target = sys.argv[3] |
| if len(sys.argv) == 4: |
| gn_target = gyp_target |
| else: |
| gn_target = sys.argv[4] |
| |
| print 'GYP output directory is %s' % gyp_dir |
| print 'GN output directory is %s' % gn_dir |
| |
| comparison = Comparison(gyp_target, gn_target, gyp_dir, gn_dir) |
| |
| gyp_files = comparison.gyp_files |
| gn_files = comparison.gn_files |
| different_source_list = comparison.gyp_files != comparison.gn_files |
| if different_source_list: |
| print 'Different set of sources files:' |
| print ' In gyp, not in GN:\n %s' % '\n '.join( |
| sorted(gyp_files - gn_files)) |
| print ' In GN, not in gyp:\n %s' % '\n '.join( |
| sorted(gn_files - gyp_files)) |
| print '\nNote that flags will only be compared for files in both sets.\n' |
| |
| differing_files = set(comparison.missing_in_gn_by_file.keys()) & \ |
| set(comparison.missing_in_gyp_by_file.keys()) |
| files_with_given_differences = {} |
| for filename in differing_files: |
| output = '' |
| missing_in_gyp = comparison.missing_in_gyp_by_file.get(filename, {}) |
| missing_in_gn = comparison.missing_in_gn_by_file.get(filename, {}) |
| difference_types = sorted(set(missing_in_gyp.keys() + missing_in_gn.keys())) |
| for difference_type in difference_types: |
| output += ' %s differ:\n' % difference_type |
| if difference_type in missing_in_gyp: |
| output += ' In gyp, but not in GN:\n %s' % '\n '.join( |
| sorted(missing_in_gyp[difference_type])) + '\n' |
| if difference_type in missing_in_gn: |
| output += ' In GN, but not in gyp:\n %s' % '\n '.join( |
| sorted(missing_in_gn[difference_type])) + '\n' |
| if output: |
| files_with_given_differences.setdefault(output, []).append(filename) |
| |
| for diff, files in files_with_given_differences.iteritems(): |
| print '\n'.join(sorted(files)) |
| print diff |
| |
| print 'Total differences:', comparison.total_differences |
| # TODO(scottmg): Return failure on difference once we're closer to identical. |
| return 0 |
| |
| |
| if __name__ == '__main__': |
| sys.exit(main()) |
