Get NDK python script tests running.

Imports weren't working in tests because the package had been created.
The Python "binaries" built by Soong don't seem to take their own
pkg_path into account, so I split the separate pieces of code here out
into their own packages.

Note that the ndk_api_coverage_parser tests do not actually pass
before or after this change (seems like it might be a
non-deterministic ordering issue in the attributes of the generated
output?), but they can at least be run now.

Test: pytest ndkstubgen
Test: pytest symbolfile
Test: pytest ndk_api_coverage_parser
Test: out/host/linux-x86/nativetest64/test_ndkstubgen/test_ndkstubgen
Test: out/host/linux-x86/nativetest64/test_symbolfile/test_symbolfile
Test: out/host/linux-x86/nativetest64/test_ndk_api_coverage_parser/test_ndk_api_coverage_parser
Bug: None
Change-Id: I2ac22f7ced7566e4808070f2f72fd04355846e0b
diff --git a/cc/ndkstubgen/.gitignore b/cc/ndkstubgen/.gitignore
new file mode 100644
index 0000000..fd94eac
--- /dev/null
+++ b/cc/ndkstubgen/.gitignore
@@ -0,0 +1,140 @@
+# From https://github.com/github/gitignore/blob/master/Python.gitignore
+
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
diff --git a/cc/ndkstubgen/Android.bp b/cc/ndkstubgen/Android.bp
new file mode 100644
index 0000000..85dfaee
--- /dev/null
+++ b/cc/ndkstubgen/Android.bp
@@ -0,0 +1,48 @@
+//
+// Copyright (C) 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+python_binary_host {
+    name: "ndkstubgen",
+    pkg_path: "ndkstubgen",
+    main: "__init__.py",
+    srcs: [
+        "__init__.py",
+    ],
+    libs: [
+        "symbolfile",
+    ],
+}
+
+python_library_host {
+    name: "ndkstubgenlib",
+    pkg_path: "ndkstubgen",
+    srcs: [
+        "__init__.py",
+    ],
+    libs: [
+        "symbolfile",
+    ],
+}
+
+python_test_host {
+    name: "test_ndkstubgen",
+    srcs: [
+        "test_ndkstubgen.py",
+    ],
+    libs: [
+        "ndkstubgenlib",
+    ],
+}
diff --git a/cc/ndkstubgen/OWNERS b/cc/ndkstubgen/OWNERS
new file mode 100644
index 0000000..f0d8733
--- /dev/null
+++ b/cc/ndkstubgen/OWNERS
@@ -0,0 +1 @@
+danalbert@google.com
diff --git a/cc/ndkstubgen/__init__.py b/cc/ndkstubgen/__init__.py
new file mode 100755
index 0000000..2f4326a
--- /dev/null
+++ b/cc/ndkstubgen/__init__.py
@@ -0,0 +1,149 @@
+#!/usr/bin/env python
+#
+# Copyright (C) 2016 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+"""Generates source for stub shared libraries for the NDK."""
+import argparse
+import json
+import logging
+import os
+import sys
+
+import symbolfile
+
+
+class Generator:
+    """Output generator that writes stub source files and version scripts."""
+    def __init__(self, src_file, version_script, arch, api, llndk, apex):
+        self.src_file = src_file
+        self.version_script = version_script
+        self.arch = arch
+        self.api = api
+        self.llndk = llndk
+        self.apex = apex
+
+    def write(self, versions):
+        """Writes all symbol data to the output files."""
+        for version in versions:
+            self.write_version(version)
+
+    def write_version(self, version):
+        """Writes a single version block's data to the output files."""
+        if symbolfile.should_omit_version(version, self.arch, self.api,
+                                          self.llndk, self.apex):
+            return
+
+        section_versioned = symbolfile.symbol_versioned_in_api(
+            version.tags, self.api)
+        version_empty = True
+        pruned_symbols = []
+        for symbol in version.symbols:
+            if symbolfile.should_omit_symbol(symbol, self.arch, self.api,
+                                             self.llndk, self.apex):
+                continue
+
+            if symbolfile.symbol_versioned_in_api(symbol.tags, self.api):
+                version_empty = False
+            pruned_symbols.append(symbol)
+
+        if len(pruned_symbols) > 0:
+            if not version_empty and section_versioned:
+                self.version_script.write(version.name + ' {\n')
+                self.version_script.write('    global:\n')
+            for symbol in pruned_symbols:
+                emit_version = symbolfile.symbol_versioned_in_api(
+                    symbol.tags, self.api)
+                if section_versioned and emit_version:
+                    self.version_script.write('        ' + symbol.name + ';\n')
+
+                weak = ''
+                if 'weak' in symbol.tags:
+                    weak = '__attribute__((weak)) '
+
+                if 'var' in symbol.tags:
+                    self.src_file.write('{}int {} = 0;\n'.format(
+                        weak, symbol.name))
+                else:
+                    self.src_file.write('{}void {}() {{}}\n'.format(
+                        weak, symbol.name))
+
+            if not version_empty and section_versioned:
+                base = '' if version.base is None else ' ' + version.base
+                self.version_script.write('}' + base + ';\n')
+
+
+def parse_args():
+    """Parses and returns command line arguments."""
+    parser = argparse.ArgumentParser()
+
+    parser.add_argument('-v', '--verbose', action='count', default=0)
+
+    parser.add_argument(
+        '--api', required=True, help='API level being targeted.')
+    parser.add_argument(
+        '--arch', choices=symbolfile.ALL_ARCHITECTURES, required=True,
+        help='Architecture being targeted.')
+    parser.add_argument(
+        '--llndk', action='store_true', help='Use the LLNDK variant.')
+    parser.add_argument(
+        '--apex', action='store_true', help='Use the APEX variant.')
+
+    parser.add_argument(
+        '--api-map', type=os.path.realpath, required=True,
+        help='Path to the API level map JSON file.')
+
+    parser.add_argument(
+        'symbol_file', type=os.path.realpath, help='Path to symbol file.')
+    parser.add_argument(
+        'stub_src', type=os.path.realpath,
+        help='Path to output stub source file.')
+    parser.add_argument(
+        'version_script', type=os.path.realpath,
+        help='Path to output version script.')
+
+    return parser.parse_args()
+
+
+def main():
+    """Program entry point."""
+    args = parse_args()
+
+    with open(args.api_map) as map_file:
+        api_map = json.load(map_file)
+    api = symbolfile.decode_api_level(args.api, api_map)
+
+    verbose_map = (logging.WARNING, logging.INFO, logging.DEBUG)
+    verbosity = args.verbose
+    if verbosity > 2:
+        verbosity = 2
+    logging.basicConfig(level=verbose_map[verbosity])
+
+    with open(args.symbol_file) as symbol_file:
+        try:
+            versions = symbolfile.SymbolFileParser(symbol_file, api_map,
+                                                   args.arch, api, args.llndk,
+                                                   args.apex).parse()
+        except symbolfile.MultiplyDefinedSymbolError as ex:
+            sys.exit('{}: error: {}'.format(args.symbol_file, ex))
+
+    with open(args.stub_src, 'w') as src_file:
+        with open(args.version_script, 'w') as version_file:
+            generator = Generator(src_file, version_file, args.arch, api,
+                                  args.llndk, args.apex)
+            generator.write(versions)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/cc/ndkstubgen/test_ndkstubgen.py b/cc/ndkstubgen/test_ndkstubgen.py
new file mode 100755
index 0000000..70bcf78
--- /dev/null
+++ b/cc/ndkstubgen/test_ndkstubgen.py
@@ -0,0 +1,378 @@
+#!/usr/bin/env python
+#
+# Copyright (C) 2016 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+"""Tests for ndkstubgen.py."""
+import io
+import textwrap
+import unittest
+
+import ndkstubgen
+import symbolfile
+
+
+# pylint: disable=missing-docstring
+
+
+class GeneratorTest(unittest.TestCase):
+    def test_omit_version(self):
+        # Thorough testing of the cases involved here is handled by
+        # OmitVersionTest, PrivateVersionTest, and SymbolPresenceTest.
+        src_file = io.StringIO()
+        version_file = io.StringIO()
+        generator = ndkstubgen.Generator(src_file, version_file, 'arm', 9,
+                                         False, False)
+
+        version = symbolfile.Version('VERSION_PRIVATE', None, [], [
+            symbolfile.Symbol('foo', []),
+        ])
+        generator.write_version(version)
+        self.assertEqual('', src_file.getvalue())
+        self.assertEqual('', version_file.getvalue())
+
+        version = symbolfile.Version('VERSION', None, ['x86'], [
+            symbolfile.Symbol('foo', []),
+        ])
+        generator.write_version(version)
+        self.assertEqual('', src_file.getvalue())
+        self.assertEqual('', version_file.getvalue())
+
+        version = symbolfile.Version('VERSION', None, ['introduced=14'], [
+            symbolfile.Symbol('foo', []),
+        ])
+        generator.write_version(version)
+        self.assertEqual('', src_file.getvalue())
+        self.assertEqual('', version_file.getvalue())
+
+    def test_omit_symbol(self):
+        # Thorough testing of the cases involved here is handled by
+        # SymbolPresenceTest.
+        src_file = io.StringIO()
+        version_file = io.StringIO()
+        generator = ndkstubgen.Generator(src_file, version_file, 'arm', 9,
+                                         False, False)
+
+        version = symbolfile.Version('VERSION_1', None, [], [
+            symbolfile.Symbol('foo', ['x86']),
+        ])
+        generator.write_version(version)
+        self.assertEqual('', src_file.getvalue())
+        self.assertEqual('', version_file.getvalue())
+
+        version = symbolfile.Version('VERSION_1', None, [], [
+            symbolfile.Symbol('foo', ['introduced=14']),
+        ])
+        generator.write_version(version)
+        self.assertEqual('', src_file.getvalue())
+        self.assertEqual('', version_file.getvalue())
+
+        version = symbolfile.Version('VERSION_1', None, [], [
+            symbolfile.Symbol('foo', ['llndk']),
+        ])
+        generator.write_version(version)
+        self.assertEqual('', src_file.getvalue())
+        self.assertEqual('', version_file.getvalue())
+
+        version = symbolfile.Version('VERSION_1', None, [], [
+            symbolfile.Symbol('foo', ['apex']),
+        ])
+        generator.write_version(version)
+        self.assertEqual('', src_file.getvalue())
+        self.assertEqual('', version_file.getvalue())
+
+    def test_write(self):
+        src_file = io.StringIO()
+        version_file = io.StringIO()
+        generator = ndkstubgen.Generator(src_file, version_file, 'arm', 9,
+                                         False, False)
+
+        versions = [
+            symbolfile.Version('VERSION_1', None, [], [
+                symbolfile.Symbol('foo', []),
+                symbolfile.Symbol('bar', ['var']),
+                symbolfile.Symbol('woodly', ['weak']),
+                symbolfile.Symbol('doodly', ['weak', 'var']),
+            ]),
+            symbolfile.Version('VERSION_2', 'VERSION_1', [], [
+                symbolfile.Symbol('baz', []),
+            ]),
+            symbolfile.Version('VERSION_3', 'VERSION_1', [], [
+                symbolfile.Symbol('qux', ['versioned=14']),
+            ]),
+        ]
+
+        generator.write(versions)
+        expected_src = textwrap.dedent("""\
+            void foo() {}
+            int bar = 0;
+            __attribute__((weak)) void woodly() {}
+            __attribute__((weak)) int doodly = 0;
+            void baz() {}
+            void qux() {}
+        """)
+        self.assertEqual(expected_src, src_file.getvalue())
+
+        expected_version = textwrap.dedent("""\
+            VERSION_1 {
+                global:
+                    foo;
+                    bar;
+                    woodly;
+                    doodly;
+            };
+            VERSION_2 {
+                global:
+                    baz;
+            } VERSION_1;
+        """)
+        self.assertEqual(expected_version, version_file.getvalue())
+
+
+class IntegrationTest(unittest.TestCase):
+    def test_integration(self):
+        api_map = {
+            'O': 9000,
+            'P': 9001,
+        }
+
+        input_file = io.StringIO(textwrap.dedent("""\
+            VERSION_1 {
+                global:
+                    foo; # var
+                    bar; # x86
+                    fizz; # introduced=O
+                    buzz; # introduced=P
+                local:
+                    *;
+            };
+
+            VERSION_2 { # arm
+                baz; # introduced=9
+                qux; # versioned=14
+            } VERSION_1;
+
+            VERSION_3 { # introduced=14
+                woodly;
+                doodly; # var
+            } VERSION_2;
+
+            VERSION_4 { # versioned=9
+                wibble;
+                wizzes; # llndk
+                waggle; # apex
+            } VERSION_2;
+
+            VERSION_5 { # versioned=14
+                wobble;
+            } VERSION_4;
+        """))
+        parser = symbolfile.SymbolFileParser(input_file, api_map, 'arm', 9,
+                                             False, False)
+        versions = parser.parse()
+
+        src_file = io.StringIO()
+        version_file = io.StringIO()
+        generator = ndkstubgen.Generator(src_file, version_file, 'arm', 9,
+                                         False, False)
+        generator.write(versions)
+
+        expected_src = textwrap.dedent("""\
+            int foo = 0;
+            void baz() {}
+            void qux() {}
+            void wibble() {}
+            void wobble() {}
+        """)
+        self.assertEqual(expected_src, src_file.getvalue())
+
+        expected_version = textwrap.dedent("""\
+            VERSION_1 {
+                global:
+                    foo;
+            };
+            VERSION_2 {
+                global:
+                    baz;
+            } VERSION_1;
+            VERSION_4 {
+                global:
+                    wibble;
+            } VERSION_2;
+        """)
+        self.assertEqual(expected_version, version_file.getvalue())
+
+    def test_integration_future_api(self):
+        api_map = {
+            'O': 9000,
+            'P': 9001,
+            'Q': 9002,
+        }
+
+        input_file = io.StringIO(textwrap.dedent("""\
+            VERSION_1 {
+                global:
+                    foo; # introduced=O
+                    bar; # introduced=P
+                    baz; # introduced=Q
+                local:
+                    *;
+            };
+        """))
+        parser = symbolfile.SymbolFileParser(input_file, api_map, 'arm', 9001,
+                                             False, False)
+        versions = parser.parse()
+
+        src_file = io.StringIO()
+        version_file = io.StringIO()
+        generator = ndkstubgen.Generator(src_file, version_file, 'arm', 9001,
+                                         False, False)
+        generator.write(versions)
+
+        expected_src = textwrap.dedent("""\
+            void foo() {}
+            void bar() {}
+        """)
+        self.assertEqual(expected_src, src_file.getvalue())
+
+        expected_version = textwrap.dedent("""\
+            VERSION_1 {
+                global:
+                    foo;
+                    bar;
+            };
+        """)
+        self.assertEqual(expected_version, version_file.getvalue())
+
+    def test_multiple_definition(self):
+        input_file = io.StringIO(textwrap.dedent("""\
+            VERSION_1 {
+                global:
+                    foo;
+                    foo;
+                    bar;
+                    baz;
+                    qux; # arm
+                local:
+                    *;
+            };
+
+            VERSION_2 {
+                global:
+                    bar;
+                    qux; # arm64
+            } VERSION_1;
+
+            VERSION_PRIVATE {
+                global:
+                    baz;
+            } VERSION_2;
+
+        """))
+        parser = symbolfile.SymbolFileParser(input_file, {}, 'arm', 16, False,
+                                             False)
+
+        with self.assertRaises(
+                symbolfile.MultiplyDefinedSymbolError) as ex_context:
+            parser.parse()
+        self.assertEqual(['bar', 'foo'],
+                         ex_context.exception.multiply_defined_symbols)
+
+    def test_integration_with_apex(self):
+        api_map = {
+            'O': 9000,
+            'P': 9001,
+        }
+
+        input_file = io.StringIO(textwrap.dedent("""\
+            VERSION_1 {
+                global:
+                    foo; # var
+                    bar; # x86
+                    fizz; # introduced=O
+                    buzz; # introduced=P
+                local:
+                    *;
+            };
+
+            VERSION_2 { # arm
+                baz; # introduced=9
+                qux; # versioned=14
+            } VERSION_1;
+
+            VERSION_3 { # introduced=14
+                woodly;
+                doodly; # var
+            } VERSION_2;
+
+            VERSION_4 { # versioned=9
+                wibble;
+                wizzes; # llndk
+                waggle; # apex
+                bubble; # apex llndk
+                duddle; # llndk apex
+            } VERSION_2;
+
+            VERSION_5 { # versioned=14
+                wobble;
+            } VERSION_4;
+        """))
+        parser = symbolfile.SymbolFileParser(input_file, api_map, 'arm', 9,
+                                             False, True)
+        versions = parser.parse()
+
+        src_file = io.StringIO()
+        version_file = io.StringIO()
+        generator = ndkstubgen.Generator(src_file, version_file, 'arm', 9,
+                                         False, True)
+        generator.write(versions)
+
+        expected_src = textwrap.dedent("""\
+            int foo = 0;
+            void baz() {}
+            void qux() {}
+            void wibble() {}
+            void waggle() {}
+            void bubble() {}
+            void duddle() {}
+            void wobble() {}
+        """)
+        self.assertEqual(expected_src, src_file.getvalue())
+
+        expected_version = textwrap.dedent("""\
+            VERSION_1 {
+                global:
+                    foo;
+            };
+            VERSION_2 {
+                global:
+                    baz;
+            } VERSION_1;
+            VERSION_4 {
+                global:
+                    wibble;
+                    waggle;
+                    bubble;
+                    duddle;
+            } VERSION_2;
+        """)
+        self.assertEqual(expected_version, version_file.getvalue())
+
+def main():
+    suite = unittest.TestLoader().loadTestsFromName(__name__)
+    unittest.TextTestRunner(verbosity=3).run(suite)
+
+
+if __name__ == '__main__':
+    main()