#!/usr/bin/env python3
# Copyright (c) 2020, the R8 project authors. Please see the AUTHORS file
# for details. All rights reserved. Use of this source code is governed by a
# BSD-style license that can be found in the LICENSE file.

import argparse
import os
import shutil
import subprocess
import sys
import zipfile

import archive
import jdk
import retrace
import utils


def make_parser():
  parser = argparse.ArgumentParser(description = 'Compile a dump artifact.')
  parser.add_argument(
      '--summary',
      help='List a summary of the contents of the dumps.',
      default=False,
      action='store_true')
  parser.add_argument(
    '-d',
    '--dump',
    help='Dump file or directory to compile',
    default=None)
  parser.add_argument(
    '--temp',
    help='Temp directory to extract the dump to, allows you to rerun the command'
      ' more easily in the terminal with changes',
    default=None)
  parser.add_argument(
    '-c',
    '--compiler',
    help='Compiler to use',
    default=None)
  parser.add_argument(
    '--minify',
    help='Force enable/disable minification'
      ' (defaults to app proguard config)',
    choices=['default', 'force-enable', 'force-disable'],
    default='default')
  parser.add_argument(
    '--optimize',
    help='Force enable/disable optimizations'
      ' (defaults to app proguard config)',
    choices=['default', 'force-enable', 'force-disable'],
    default='default')
  parser.add_argument(
    '--shrink',
    help='Force enable/disable shrinking'
      ' (defaults to app proguard config)',
    choices=['default', 'force-enable', 'force-disable'],
    default='default')
  parser.add_argument(
    '-v',
    '--version',
    help='Compiler version to use (default read from dump version file).'
      'Valid arguments are:'
      '  "main" to run from your own tree,'
      '  "source" to run from build classes directly,'
      '  "X.Y.Z" to run a specific version, or'
      '  <hash> to run that hash from main.',
    default=None)
  parser.add_argument(
    '--r8-jar',
    help='Path to an R8 jar.',
    default=None)
  parser.add_argument(
    '--r8-flags', '--r8_flags',
    help='Additional option(s) for the compiler.')
  parser.add_argument(
    '--pg-conf', '--pg_conf',
    help='Keep rule file(s).',
    action='append')
  parser.add_argument(
    '--override',
    help='Do not override any extracted dump in temp-dir',
    default=False,
    action='store_true')
  parser.add_argument(
    '--nolib',
    help='Use the non-lib distribution (default uses the lib distribution)',
    default=False,
    action='store_true')
  parser.add_argument(
    '--print-times',
    help='Print timing information from r8',
    default=False,
    action='store_true')
  parser.add_argument(
    '--ea',
    help='Enable Java assertions when running the compiler (default disabled)',
    default=False,
    action='store_true')
  parser.add_argument(
    '--classfile',
    help='Run with classfile output',
    default=False,
    action='store_true')
  parser.add_argument(
      '--debug-agent',
      help='Enable Java debug agent and suspend compilation (default disabled)',
      default=False,
      action='store_true')
  parser.add_argument(
      '--xmx',
      help='Set JVM max heap size (-Xmx)',
      default=None)
  parser.add_argument(
      '--threads',
      help='Set the number of threads to use',
      default=None)
  parser.add_argument(
      '--min-api',
      help='Set min-api (default read from dump properties file)',
      default=None)
  parser.add_argument(
    '--desugared-lib',
    help='Set desugared-library (default set from dump)',
    default=None)
  parser.add_argument(
    '--disable-desugared-lib',
    help='Disable desugared-libary if it will be set from dump',
    default=False,
    action='store_true'
  )
  parser.add_argument(
    '--loop',
    help='Run the compilation in a loop',
    default=False,
    action='store_true')
  parser.add_argument(
    '--enable-missing-library-api-modeling',
    help='Run with api modeling',
    default=False,
    action='store_true')
  parser.add_argument(
    '--android-platform-build',
    help='Run as a platform build',
    default=False,
    action='store_true')
  parser.add_argument(
    '--compilation-mode', '--compilation_mode',
    help='Run compilation in specified mode',
    choices=['debug', 'release'],
    default=None)
  return parser

def error(msg):
  print(msg)
  sys.exit(1)

class Dump(object):

  def __init__(self, directory):
    self.directory = directory

  def if_exists(self, name):
    f = os.path.join(self.directory, name)
    if os.path.exists(f):
      return f
    return None

  def program_jar(self):
    return self.if_exists('program.jar')

  def feature_jars(self):
    feature_jars = []
    i = 1
    while True:
      feature_jar = self.if_exists('feature-%s.jar' % i)
      if feature_jar:
        feature_jars.append(feature_jar)
        i = i + 1
      else:
        return feature_jars

  def library_jar(self):
    return self.if_exists('library.jar')

  def classpath_jar(self):
    return self.if_exists('classpath.jar')

  def desugared_library_json(self):
    return self.if_exists('desugared-library.json')

  def proguard_input_map(self):
    if self.if_exists('proguard_input.config'):
      print("Unimplemented: proguard_input configuration.")

  def main_dex_list_resource(self):
    return self.if_exists('main-dex-list.txt')

  def main_dex_rules_resource(self):
    return self.if_exists('main-dex-rules.txt')

  def art_profile_resources(self):
    art_profile_resources = []
    while True:
      current_art_profile_index = len(art_profile_resources) + 1
      art_profile_resource = self.if_exists(
          'art-profile-%s.txt' % current_art_profile_index)
      if art_profile_resource is None:
        return art_profile_resources
      art_profile_resources.append(art_profile_resource)

  def startup_profile_resources(self):
    startup_profile_resources = []
    while True:
      current_startup_profile_index = len(startup_profile_resources) + 1
      startup_profile_resource = self.if_exists(
          'startup-profile-%s.txt' % current_startup_profile_index)
      if startup_profile_resource is None:
        return startup_profile_resources
      startup_profile_resources.append(startup_profile_resource)

  def build_properties_file(self):
    return self.if_exists('build.properties')

  def config_file(self):
    return self.if_exists('proguard.config')

  def version_file(self):
    return self.if_exists('r8-version')

  def version(self):
    f = self.version_file()
    if f:
      return open(f).read().split(' ')[0]
    return None

def read_dump_from_args(args, temp):
  if args.dump is None:
    error("A dump file or directory must be specified")
  return read_dump(args.dump, temp, args.override)

def read_dump(dump, temp, override=False):
  if os.path.isdir(dump):
    return Dump(dump)
  dump_file = zipfile.ZipFile(os.path.abspath(dump), 'r')
  with utils.ChangedWorkingDirectory(temp, quiet=True):
    if override or not os.path.isfile('r8-version'):
      dump_file.extractall()
      if not os.path.isfile('r8-version'):
        error("Did not extract into %s. Either the zip file is invalid or the "
              "dump is missing files" % temp)
    return Dump(temp)

def determine_build_properties(args, dump):
  build_properties = {}
  build_properties_file = dump.build_properties_file()
  if build_properties_file:
    with open(build_properties_file) as f:
      build_properties_contents = f.readlines()
      for line in build_properties_contents:
        stripped = line.strip()
        if stripped:
          pair = stripped.split('=')
          build_properties[pair[0]] = pair[1]
    if 'mode' not in build_properties:
      build_properties['mode'] = 'release'
  return build_properties

def determine_version(args, dump):
  if args.version is None:
    return dump.version()
  return args.version

def determine_compiler(args, build_properties):
  compilers = ['d8', 'r8', 'r8full', 'l8', 'l8d8', 'tracereferences']
  compiler = args.compiler
  if not compiler and 'tool' in build_properties:
    compiler = build_properties.get('tool').lower()
    if compiler == 'r8':
      if not 'force-proguard-compatibility' in build_properties:
        error("Unable to determine R8 compiler variant from build.properties."
              " No value for 'force-proguard-compatibility'.")
      if build_properties.get('force-proguard-compatibility').lower() == 'false':
        compiler = compiler + 'full'
    if compiler == 'TraceReferences':
      compiler = build_properties.get('tool').lower()
  if compiler not in compilers:
    error("Unable to determine a compiler to use. Specified %s,"
          " Valid options: %s" % (args.compiler, ', '.join(compilers)))
  return compiler

def determine_trace_references_commands(build_properties, output):
  trace_ref_consumer = build_properties.get('trace_references_consumer')
  if trace_ref_consumer == 'com.android.tools.r8.tracereferences.TraceReferencesCheckConsumer':
    return ["--check"]
  else:
    assert trace_ref_consumer == 'com.android.tools.r8.tracereferences.TraceReferencesKeepRules'
    args = ['--allowobfuscation'] if build_properties.get('minification') == 'true' else []
    args.extend(['--keep-rules', '--output', output])
    return args

def is_l8_compiler(compiler):
  return compiler.startswith('l8')

def is_r8_compiler(compiler):
  return compiler.startswith('r8')

def determine_config_files(args, dump, temp):
  if args.pg_conf:
    config_files = []
    for config_file in args.pg_conf:
      dst = os.path.join(temp, 'proguard-%s.config' % len(config_files))
      shutil.copyfile(config_file, dst)
      config_files.append(dst)
    return config_files
  dump_config_file = dump.config_file()
  if dump_config_file:
    return [dump_config_file]
  return []

def determine_output(args, temp):
  return os.path.join(temp, 'out.jar')

def determine_min_api(args, build_properties):
  if args.min_api:
    return args.min_api
  if 'min-api' in build_properties:
    return build_properties.get('min-api')
  return None

def determine_residual_art_profile_output(art_profile, temp):
  return os.path.join(temp, os.path.basename(art_profile)[:-4] + ".out.txt")

def determine_desugared_lib_pg_conf_output(temp):
  return os.path.join(temp, 'desugared-library-keep-rules.config')

def determine_feature_output(feature_jar, temp):
  return os.path.join(temp, os.path.basename(feature_jar)[:-4] + ".out.jar")

def determine_program_jar(args, dump):
  if hasattr(args, 'program_jar') and args.program_jar:
    return args.program_jar
  return dump.program_jar()

def determine_class_file(args, build_properties):
  return args.classfile \
      or build_properties.get('backend', 'dex').lower() == 'cf'

def determine_android_platform_build(args, build_properties):
  if args.android_platform_build:
    return True
  return build_properties.get('android-platform-build') == 'true'

def determine_enable_missing_library_api_modeling(args, build_properties):
  if args.enable_missing_library_api_modeling:
    return True
  return build_properties.get('enable-missing-library-api-modeling') == 'true'

def determine_compilation_mode(args, build_properties):
  if args.compilation_mode:
    return args.compilation_mode
  return build_properties.get('mode')

def determine_properties(build_properties):
  args = []
  for key, value in build_properties.items():
    # When writing dumps all system properties starting with com.android.tools.r8
    # are written to the build.properties file in the format
    # system-property-com.android.tools.r8.XXX=<value>
    if key.startswith('system-property-'):
      name = key[len('system-property-'):]
      if name.endswith('dumpinputtofile') or name.endswith('dumpinputtodirectory'):
        continue
      if len(value) == 0:
        args.append('-D' + name)
      else:
        args.append('-D' + name + '=' + value)
  return args

def download_distribution(version, nolib, temp):
  if version == 'main':
    return utils.R8_JAR if nolib else utils.R8LIB_JAR
  if version == 'source':
    return '%s:%s' % (utils.BUILD_JAVA_MAIN_DIR, utils.ALL_DEPS_JAR)
  name = 'r8.jar' if nolib else 'r8lib.jar'
  source = archive.GetUploadDestination(version, name, is_hash(version))
  dest = os.path.join(temp, 'r8.jar')
  utils.download_file_from_cloud_storage(source, dest)
  return dest

def clean_configs(files, args):
  for file in files:
    clean_config(file, args)

def clean_config(file, args):
  with open(file) as f:
    lines = f.readlines()
  minify = args.minify
  optimize = args.optimize
  shrink = args.shrink
  with open(file, 'w') as f:
    if minify == 'force-disable':
      print('Adding config line: -dontobfuscate')
      f.write('-dontobfuscate\n')
    if optimize == 'force-disable':
      print('Adding config line: -dontoptimize')
      f.write('-dontoptimize\n')
    if shrink == 'force-disable':
      print('Adding config line: -dontshrink')
      f.write('-dontshrink\n')
    for line in lines:
      if clean_config_line(line, minify, optimize, shrink):
        print('Removing from config line: \n%s' % line)
      else:
        f.write(line)

def clean_config_line(line, minify, optimize, shrink):
  if line.lstrip().startswith('#'):
    return False
  if ('-injars' in line or '-libraryjars' in line or
      '-print' in line or '-applymapping' in line):
    return True
  if minify == 'force-enable' and '-dontobfuscate' in line:
    return True
  if optimize == 'force-enable' and '-dontoptimize' in line:
    return True
  if shrink == 'force-enable' and '-dontshrink' in line:
    return True
  return False

def prepare_r8_wrapper(dist, temp, jdkhome):
  compile_wrapper_with_javac(
    dist,
    temp,
    jdkhome,
    os.path.join(
      utils.REPO_ROOT,
      'src/main/java/com/android/tools/r8/utils/CompileDumpCompatR8.java'))

def prepare_d8_wrapper(dist, temp, jdkhome):
  compile_wrapper_with_javac(
    dist,
    temp,
    jdkhome,
    os.path.join(
      utils.REPO_ROOT,
      'src/main/java/com/android/tools/r8/utils/CompileDumpD8.java'))

def compile_wrapper_with_javac(dist, temp, jdkhome, path):
  base_path = os.path.join(
      utils.REPO_ROOT,
      'src/main/java/com/android/tools/r8/utils/CompileDumpBase.java')
  cmd = [
    jdk.GetJavacExecutable(jdkhome),
    path,
    base_path,
    '-d', temp,
    '-cp', dist,
  ]
  utils.PrintCmd(cmd)
  subprocess.check_output(cmd)

def is_hash(version):
  return len(version) == 40

def run1(out, args, otherargs, jdkhome=None):
  jvmargs = []
  compilerargs = []
  for arg in otherargs:
    if arg.startswith('-D'):
      jvmargs.append(arg)
    else:
      compilerargs.append(arg)
  with utils.TempDir() as temp:
    if out:
      temp = out
      if not os.path.exists(temp):
        os.makedirs(temp)
    dump = read_dump_from_args(args, temp)
    if not dump.program_jar():
      error("Cannot compile dump with no program classes")
    if not dump.library_jar():
      print("WARNING: Unexpected lack of library classes in dump")
    build_properties = determine_build_properties(args, dump)
    version = determine_version(args, dump)
    compiler = determine_compiler(args, build_properties)
    config_files = determine_config_files(args, dump, temp)
    out = determine_output(args, temp)
    min_api = determine_min_api(args, build_properties)
    classfile = determine_class_file(args, build_properties)
    android_platform_build = determine_android_platform_build(args, build_properties)
    enable_missing_library_api_modeling = determine_enable_missing_library_api_modeling(args, build_properties)
    mode = determine_compilation_mode(args, build_properties)
    jar = args.r8_jar if args.r8_jar else download_distribution(version, args.nolib, temp)
    if ':' not in jar and not os.path.exists(jar):
      error("Distribution does not exist: " + jar)
    cmd = [jdk.GetJavaExecutable(jdkhome)]
    cmd.extend(jvmargs)
    if args.debug_agent:
      if not args.nolib:
        print("WARNING: Running debugging agent on r8lib is questionable...")
      cmd.append(
          '-agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=*:5005')
    if args.xmx:
      cmd.append('-Xmx' + args.xmx)
    if args.ea:
      cmd.append('-ea')
      cmd.append('-Dcom.android.tools.r8.enableTestAssertions=1')
    if args.print_times:
      cmd.append('-Dcom.android.tools.r8.printtimes=1')
    if args.r8_flags:
      cmd.extend(args.r8_flags.split(' '))
    if hasattr(args, 'properties'):
      cmd.extend(args.properties)
    cmd.extend(determine_properties(build_properties))
    cmd.extend(['-cp', '%s:%s' % (temp, jar)])
    if compiler == 'd8':
      prepare_d8_wrapper(jar, temp, jdkhome)
      cmd.append('com.android.tools.r8.utils.CompileDumpD8')
    if is_l8_compiler(compiler):
      cmd.append('com.android.tools.r8.L8')
    if compiler == 'tracereferences':
      cmd.append('com.android.tools.r8.tracereferences.TraceReferences')
      cmd.extend(determine_trace_references_commands(build_properties, out))
    if compiler.startswith('r8'):
      prepare_r8_wrapper(jar, temp, jdkhome)
      cmd.append('com.android.tools.r8.utils.CompileDumpCompatR8')
    if compiler == 'r8':
      cmd.append('--compat')
    if compiler != 'tracereferences':
      assert mode == 'debug' or mode == 'release'
      cmd.append('--' + mode)
    # For recompilation of dumps run_on_app_dumps pass in a program jar.
    program_jar = determine_program_jar(args, dump)
    if compiler != 'tracereferences':
      cmd.append(program_jar)
      cmd.extend(['--output', out])
    else:
      cmd.extend(['--source', program_jar])
    for feature_jar in dump.feature_jars():
      cmd.extend(['--feature-jar', feature_jar,
                 determine_feature_output(feature_jar, temp)])
    if dump.library_jar():
      cmd.extend(['--lib', dump.library_jar()])
    if dump.classpath_jar() and not is_l8_compiler(compiler):
      cmd.extend(
        ['--target' if compiler == 'tracereferences' else '--classpath',
         dump.classpath_jar()])
    if dump.desugared_library_json() and not args.disable_desugared_lib:
      cmd.extend(['--desugared-lib', dump.desugared_library_json()])
      if not is_l8_compiler(compiler):
        cmd.extend([
            '--desugared-lib-pg-conf-output',
            determine_desugared_lib_pg_conf_output(temp)])
    if (is_r8_compiler(compiler) or compiler == 'l8') and config_files:
      if hasattr(args, 'config_files_consumer') and args.config_files_consumer:
        args.config_files_consumer(config_files)
      else:
        # If we get a dump from the wild we can't use -injars, -libraryjars or
        # -print{mapping,usage}
        clean_configs(config_files, args)
      for config_file in config_files:
        cmd.extend(['--pg-conf', config_file])
      cmd.extend(['--pg-map-output', '%s.map' % out])
    if dump.main_dex_list_resource():
      cmd.extend(['--main-dex-list', dump.main_dex_list_resource()])
    if dump.main_dex_rules_resource():
      cmd.extend(['--main-dex-rules', dump.main_dex_rules_resource()])
    for art_profile_resource in dump.art_profile_resources():
      residual_art_profile_output = \
          determine_residual_art_profile_output(art_profile_resource, temp)
      cmd.extend([
          '--art-profile', art_profile_resource, residual_art_profile_output])
    for startup_profile_resource in dump.startup_profile_resources():
      cmd.extend(['--startup-profile', startup_profile_resource])
    if min_api:
      cmd.extend(['--min-api', min_api])
    if classfile:
      cmd.extend(['--classfile'])
    if android_platform_build:
      cmd.extend(['--android-platform-build'])
    if enable_missing_library_api_modeling:
      cmd.extend(['--enable-missing-library-api-modeling'])
    if args.threads:
      cmd.extend(['--threads', args.threads])
    cmd.extend(compilerargs)
    utils.PrintCmd(cmd)
    try:
      print(subprocess.check_output(cmd, stderr=subprocess.STDOUT).decode('utf-8'))
      return 0
    except subprocess.CalledProcessError as e:
      if args.nolib \
          or version == 'source' \
          or not try_retrace_output(e, version, temp):
        print(e.output.decode('UTF-8'))
      return 1

def try_retrace_output(e, version, temp):
  try:
    stacktrace = os.path.join(temp, 'stacktrace')
    open(stacktrace, 'w+').write(e.output.decode('UTF-8'))
    print("=" * 80)
    print(" RETRACED OUTPUT")
    print("=" * 80)
    retrace.run(get_map_file(version, temp), stacktrace, no_r8lib=False)
    return True
  except Exception as e2:
    print("Failed to retrace for version: %s" % version)
    print(e2)
    return False

def get_map_file(version, temp):
  if version == 'main':
    return utils.R8LIB_MAP
  download_path = archive.GetUploadDestination(
        version,
        'r8lib.jar.map',
        is_hash(version))
  if utils.file_exists_on_cloud_storage(download_path):
    map_path = os.path.join(temp, 'mapping.map')
    utils.download_file_from_cloud_storage(download_path, map_path)
    return map_path
  else:
    print('Could not find map file from argument: %s.' % version)
    return None

def summarize_dump_files(dumpfiles):
  if len(dumpfiles) == 0:
    error('Summary command expects a list of dumps to summarize')
  for f in dumpfiles:
    print(f + ':')
    try:
      with utils.TempDir() as temp:
        dump = read_dump(f, temp)
        summarize_dump(dump)
    except IOError as e:
      print("Error: " + str(e))
    except zipfile.BadZipfile as e:
      print("Error: " + str(e))

def summarize_dump(dump):
  version = dump.version()
  if not version:
    print('No dump version info')
    return
  print('version=' + version)
  props = dump.build_properties_file()
  if props:
    with open(props) as props_file:
      print(props_file.read())
  if dump.library_jar():
    print('library.jar present')
  if dump.classpath_jar():
    print('classpath.jar present')
  prog = dump.program_jar()
  if prog:
    print('program.jar content:')
    summarize_jar(prog)

def summarize_jar(jar):
  with zipfile.ZipFile(jar) as zip:
    pkgs = {}
    for info in zip.infolist():
      if info.filename.endswith('.class'):
        pkg, clazz = os.path.split(info.filename)
        count = pkgs.get(pkg, 0)
        pkgs[pkg] = count + 1
  sorted = list(pkgs.keys())
  sorted.sort()
  for p in sorted:
    print('  ' + p + ': ' + str(pkgs[p]))

def run(args, otherargs):
  if args.summary:
    summarize_dump_files(otherargs)
  elif args.loop:
    count = 1
    while True:
      print('Iteration {:03d}'.format(count))
      out = args.temp
      if out:
        out = os.path.join(out, '{:03d}'.format(count))
      run1(out, args, otherargs)
      count += 1
  else:
    run1(args.temp, args, otherargs)

if __name__ == '__main__':
  (args, otherargs) = make_parser().parse_known_args(sys.argv[1:])
  sys.exit(run(args, otherargs))