Tools: Switch from JAR-per-tool to a single swiss army knife

Introduce SwissArmyKnife entrypoint that defers to the different
entrypoints based on the first argument, defaulting to R8.main()
if the first argument is not recognized as the name of a tool.

In build.gradle, change tasks for D8, CompatDx and CompatProguard
to simply repackaging the R8 JAR but with a different Main-Class.
Remove gradle tasks for DexFileMerger, DexSplitter, D8Logger, disasm,
bisect, DexSegments, maindex, ExtractMarker, jardiff.

Introduce toolhelper.py with a run() method that runs the swiss army
knife. Change r8.py, d8.py, compatdx.py nad bisect.py to use
toolhelper.run(), and add Python scripts compatproguard, d8logger,
dexfilemerger, dexsegments, dexsplitter, disasm, extractmarker, jardiff,
maindex that use toolhelper.run().

Make archive.py use subprocess.check_output() directly instead of going
through r8.run() and d8.run() to get the versions.

Simplify run_on_app.py a bit by using toolhelper.run().

Change-Id: I752705188e728d2c4f7bfdc61b90448298eaa5bd
diff --git a/tools/archive.py b/tools/archive.py
index 815e416..32d58bc 100755
--- a/tools/archive.py
+++ b/tools/archive.py
@@ -3,22 +3,25 @@
 # 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 gradle
 import create_maven_release
-import d8
+import gradle
 import os
-import r8
+import shutil
 import subprocess
 import sys
+import toolhelper
 import utils
-import shutil
 import zipfile
 
 ARCHIVE_BUCKET = 'r8-releases'
 
+def GetToolVersion(jar_path):
+  output = subprocess.check_output(['java', '-jar', jar_path, '--version'])
+  return output.splitlines()[0].strip()
+
 def GetVersion():
-  r8_version = r8.run(['--version'], build = False).splitlines()[0].strip()
-  d8_version = d8.run(['--version'], build = False).splitlines()[0].strip()
+  r8_version = GetToolVersion(utils.R8_JAR)
+  d8_version = GetToolVersion(utils.D8_JAR)
   # The version printed is "D8 vVERSION_NUMBER" and "R8 vVERSION_NUMBER"
   # Sanity check that versions match.
   if d8_version.split()[1] != r8_version.split()[1]:
diff --git a/tools/bisect.py b/tools/bisect.py
index c8d1501..74c880e 100755
--- a/tools/bisect.py
+++ b/tools/bisect.py
@@ -3,33 +3,8 @@
 # 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 gradle
-import os
-import subprocess
 import sys
-import utils
-
-JAR = os.path.join(utils.REPO_ROOT, 'build', 'libs', 'bisect.jar')
-
-def run(args, build, debug):
-  if build:
-    gradle.RunGradle(['bisect'])
-  cmd = ['java']
-  if debug:
-    cmd.append('-ea')
-  cmd.extend(['-jar', JAR])
-  cmd.extend(args)
-  subprocess.check_call(cmd)
-
-def main():
-  build = True
-  args = []
-  for arg in sys.argv[1:]:
-    if arg in ("--build", "--no-build"):
-      build = arg == "--build"
-    else:
-      args.append(arg)
-  run(args, build, True)
+import toolhelper
 
 if __name__ == '__main__':
-  sys.exit(main())
+  sys.exit(toolhelper.run('bisect', sys.argv[1:]))
diff --git a/tools/compatdx.py b/tools/compatdx.py
index 25a59db..c4cb320 100755
--- a/tools/compatdx.py
+++ b/tools/compatdx.py
@@ -3,42 +3,8 @@
 # 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 gradle
-import os
-import subprocess
 import sys
-import utils
-
-def run(args, build = True, debug = True, profile = False, track_memory_file=None):
-  if build:
-    gradle.RunGradle(['CompatDX'])
-  cmd = []
-  if track_memory_file:
-    cmd.extend(['tools/track_memory.sh', track_memory_file])
-  cmd.append('java')
-  if debug:
-    cmd.append('-ea')
-  if profile:
-    cmd.append('-agentlib:hprof=cpu=samples,interval=1,depth=8')
-  cmd.extend(['-jar', utils.COMPATDX_JAR])
-  cmd.extend(args)
-  subprocess.check_call(cmd)
-
-def main():
-  build = True
-  args = []
-  for arg in sys.argv[1:]:
-    if arg in ("--build", "--no-build"):
-      build = arg == "--build"
-    else:
-      args.append(arg)
-  try:
-    run(args, build)
-  except subprocess.CalledProcessError as e:
-    # In case anything relevant was printed to stdout, normally this is already
-    # on stderr.
-    print(e.output)
-    return e.returncode
+import toolhelper
 
 if __name__ == '__main__':
-  sys.exit(main())
+  sys.exit(toolhelper.run('compatdx', sys.argv[1:]))
diff --git a/tools/compatproguard.py b/tools/compatproguard.py
new file mode 100755
index 0000000..10542e3
--- /dev/null
+++ b/tools/compatproguard.py
@@ -0,0 +1,10 @@
+#!/usr/bin/env python
+# Copyright (c) 2018, 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 sys
+import toolhelper
+
+if __name__ == '__main__':
+  sys.exit(toolhelper.run('compatproguard', sys.argv[1:]))
diff --git a/tools/d8.py b/tools/d8.py
index bf97845..18a4a67 100755
--- a/tools/d8.py
+++ b/tools/d8.py
@@ -3,46 +3,8 @@
 # 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 gradle
-import os
-import subprocess
 import sys
-import utils
-
-def run(args, build=True, debug=True, profile=False,
-        track_memory_file=None):
-  if build:
-    gradle.RunGradle(['D8'])
-  cmd = []
-  if track_memory_file:
-    cmd.extend(['tools/track_memory.sh', track_memory_file])
-  cmd.append('java')
-  if debug:
-    cmd.append('-ea')
-  if profile:
-    cmd.append('-agentlib:hprof=cpu=samples,interval=1,depth=8')
-  cmd.extend(['-jar', utils.D8_JAR])
-  cmd.extend(args)
-  utils.PrintCmd(cmd)
-  result = subprocess.check_output(cmd)
-  print(result)
-  return result
-
-def main():
-  build = True
-  args = []
-  for arg in sys.argv[1:]:
-    if arg in ("--build", "--no-build"):
-      build = arg == "--build"
-    else:
-      args.append(arg)
-  try:
-    run(args, build)
-  except subprocess.CalledProcessError as e:
-    # In case anything relevant was printed to stdout, normally this is already
-    # on stderr.
-    print(e.output)
-    return e.returncode
+import toolhelper
 
 if __name__ == '__main__':
-  sys.exit(main())
+  sys.exit(toolhelper.run('d8', sys.argv[1:]))
diff --git a/tools/d8logger.py b/tools/d8logger.py
new file mode 100755
index 0000000..9fb3508
--- /dev/null
+++ b/tools/d8logger.py
@@ -0,0 +1,10 @@
+#!/usr/bin/env python
+# Copyright (c) 2018, 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 sys
+import toolhelper
+
+if __name__ == '__main__':
+  sys.exit(toolhelper.run('d8logger', sys.argv[1:]))
diff --git a/tools/dexfilemerger.py b/tools/dexfilemerger.py
new file mode 100755
index 0000000..7bdfc22
--- /dev/null
+++ b/tools/dexfilemerger.py
@@ -0,0 +1,10 @@
+#!/usr/bin/env python
+# Copyright (c) 2018, 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 sys
+import toolhelper
+
+if __name__ == '__main__':
+  sys.exit(toolhelper.run('dexfilemerger', sys.argv[1:]))
diff --git a/tools/dexsegments.py b/tools/dexsegments.py
new file mode 100755
index 0000000..f984063
--- /dev/null
+++ b/tools/dexsegments.py
@@ -0,0 +1,10 @@
+#!/usr/bin/env python
+# Copyright (c) 2018, 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 sys
+import toolhelper
+
+if __name__ == '__main__':
+  sys.exit(toolhelper.run('dexsegments', sys.argv[1:]))
diff --git a/tools/dexsplitter.py b/tools/dexsplitter.py
new file mode 100755
index 0000000..415b149
--- /dev/null
+++ b/tools/dexsplitter.py
@@ -0,0 +1,10 @@
+#!/usr/bin/env python
+# Copyright (c) 2018, 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 sys
+import toolhelper
+
+if __name__ == '__main__':
+  sys.exit(toolhelper.run('dexsplitter', sys.argv[1:]))
diff --git a/tools/disasm.py b/tools/disasm.py
new file mode 100755
index 0000000..0d2599a
--- /dev/null
+++ b/tools/disasm.py
@@ -0,0 +1,10 @@
+#!/usr/bin/env python
+# Copyright (c) 2018, 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 sys
+import toolhelper
+
+if __name__ == '__main__':
+  sys.exit(toolhelper.run('disasm', sys.argv[1:]))
diff --git a/tools/extractmarker.py b/tools/extractmarker.py
new file mode 100755
index 0000000..36a9c88
--- /dev/null
+++ b/tools/extractmarker.py
@@ -0,0 +1,10 @@
+#!/usr/bin/env python
+# Copyright (c) 2018, 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 sys
+import toolhelper
+
+if __name__ == '__main__':
+  sys.exit(toolhelper.run('extractmarker', sys.argv[1:]))
diff --git a/tools/jardiff.py b/tools/jardiff.py
new file mode 100755
index 0000000..894131c
--- /dev/null
+++ b/tools/jardiff.py
@@ -0,0 +1,10 @@
+#!/usr/bin/env python
+# Copyright (c) 2018, 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 sys
+import toolhelper
+
+if __name__ == '__main__':
+  sys.exit(toolhelper.run('jardiff', sys.argv[1:]))
diff --git a/tools/maindex.py b/tools/maindex.py
new file mode 100755
index 0000000..ff5329a
--- /dev/null
+++ b/tools/maindex.py
@@ -0,0 +1,10 @@
+#!/usr/bin/env python
+# Copyright (c) 2018, 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 sys
+import toolhelper
+
+if __name__ == '__main__':
+  sys.exit(toolhelper.run('maindex', sys.argv[1:]))
diff --git a/tools/r8.py b/tools/r8.py
index 3ae4da7..60c60a0 100755
--- a/tools/r8.py
+++ b/tools/r8.py
@@ -3,46 +3,8 @@
 # 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 gradle
-import os
-import subprocess
 import sys
-import utils
-
-def run(args, build=True, debug=True, profile=False,
-        track_memory_file=None):
-  if build:
-    gradle.RunGradle(['r8'])
-  cmd = []
-  if track_memory_file:
-    cmd.extend(['tools/track_memory.sh', track_memory_file])
-  cmd.append('java')
-  if debug:
-    cmd.append('-ea')
-  if profile:
-    cmd.append('-agentlib:hprof=cpu=samples,interval=1,depth=8')
-  cmd.extend(['-jar', utils.R8_JAR])
-  cmd.extend(args)
-  utils.PrintCmd(cmd)
-  result = subprocess.check_output(cmd)
-  print(result)
-  return result
-
-def main():
-  build = True
-  args = []
-  for arg in sys.argv[1:]:
-    if arg in ("--build", "--no-build"):
-      build = arg == "--build"
-    else:
-      args.append(arg)
-  try:
-    run(args, build)
-  except subprocess.CalledProcessError as e:
-    # In case anything relevant was printed to stdout, normally this is already
-    # on stderr.
-    print(e.output)
-    return e.returncode
+import toolhelper
 
 if __name__ == '__main__':
-  sys.exit(main())
+  sys.exit(toolhelper.run('r8', sys.argv[1:]))
diff --git a/tools/run-d8-on-gmscore.py b/tools/run-d8-on-gmscore.py
index 63865d0..b1bdc6e 100755
--- a/tools/run-d8-on-gmscore.py
+++ b/tools/run-d8-on-gmscore.py
@@ -3,11 +3,11 @@
 # 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 d8
 import gmscore_data
 import optparse
 import os
 import sys
+import toolhelper
 
 def ParseOptions():
   result = optparse.OptionParser()
@@ -70,8 +70,13 @@
     with open(options.dump_args_file, 'w') as args_file:
       args_file.writelines([arg + os.linesep for arg in args])
   else:
-    d8.run(args, not options.no_build, not options.no_debug, options.profile,
-           options.track_memory_to_file)
+    toolhelper.run(
+        'd8',
+        args,
+        build=not options.no_build,
+        debug=not options.no_debug,
+        profile=options.profile,
+        track_memory_to_file=options.track_memory_to_file)
 
 if __name__ == '__main__':
   sys.exit(main())
diff --git a/tools/run_on_app.py b/tools/run_on_app.py
index b9bcc60..571d96d 100755
--- a/tools/run_on_app.py
+++ b/tools/run_on_app.py
@@ -10,10 +10,9 @@
 import sys
 import time
 
-import d8
 import gmail_data
 import gmscore_data
-import r8
+import toolhelper
 import utils
 import youtube_data
 
@@ -191,22 +190,20 @@
       if options.print_memoryuse and not options.track_memory_to_file:
         options.track_memory_to_file = os.path.join(temp,
             utils.MEMORY_USE_TMP_FILE)
-      if options.compiler == 'd8':
-        d8.run(args, not options.no_build, not options.no_debug,
-            options.profile, options.track_memory_to_file)
-      else:
-        if app_provided_pg_conf:
-          # Ensure that output of -printmapping and -printseeds go to the output
-          # location and not where the app Proguard configuration places them.
-          if outdir.endswith('.zip') or outdir.endswith('.jar'):
-            pg_outdir = os.path.dirname(outdir)
-          else:
-            pg_outdir = outdir
-          additional_pg_conf = GenerateAdditionalProguardConfiguration(
-              temp, os.path.abspath(pg_outdir))
-          args.extend(['--pg-conf', additional_pg_conf])
-        r8.run(args, not options.no_build, not options.no_debug,
-            options.profile, options.track_memory_to_file)
+      if options.compiler == 'r8' and app_provided_pg_conf:
+        # Ensure that output of -printmapping and -printseeds go to the output
+        # location and not where the app Proguard configuration places them.
+        if outdir.endswith('.zip') or outdir.endswith('.jar'):
+          pg_outdir = os.path.dirname(outdir)
+        else:
+          pg_outdir = outdir
+        additional_pg_conf = GenerateAdditionalProguardConfiguration(
+            temp, os.path.abspath(pg_outdir))
+        args.extend(['--pg-conf', additional_pg_conf])
+      toolhelper.run(options.compiler, args, build=not options.no_build,
+                     debug=not options.no_debug,
+                     profile=options.profile,
+                     track_memory_to_file=options.track_memory_to_file)
       if options.print_memoryuse:
         print('{}(MemoryUse): {}'
             .format(options.print_memoryuse,
diff --git a/tools/toolhelper.py b/tools/toolhelper.py
new file mode 100644
index 0000000..a7f509c
--- /dev/null
+++ b/tools/toolhelper.py
@@ -0,0 +1,38 @@
+# Copyright (c) 2018, 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 gradle
+import os
+import subprocess
+import sys
+import utils
+
+def run(tool, args, build=None, debug=True,
+        profile=False, track_memory_file=None):
+  if build is None:
+    build, args = extract_build_from_args(args)
+  if build:
+    gradle.RunGradle(['r8'])
+  cmd = []
+  if track_memory_file:
+    cmd.extend(['tools/track_memory.sh', track_memory_file])
+  cmd.append('java')
+  if debug:
+    cmd.append('-ea')
+  if profile:
+    cmd.append('-agentlib:hprof=cpu=samples,interval=1,depth=8')
+  cmd.extend(['-jar', utils.R8_JAR, tool])
+  cmd.extend(args)
+  utils.PrintCmd(cmd)
+  return subprocess.call(cmd)
+
+def extract_build_from_args(input_args):
+  build = True
+  args = []
+  for arg in input_args:
+    if arg in ("--build", "--no-build"):
+      build = arg == "--build"
+    else:
+      args.append(arg)
+  return build, args