| #!/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 re |
| |
| |
| ALL_ARCHITECTURES = ( |
| 'arm', |
| 'arm64', |
| 'mips', |
| 'mips64', |
| 'x86', |
| 'x86_64', |
| ) |
| |
| |
| # Arbitrary magic number. We use the same one in api-level.h for this purpose. |
| FUTURE_API_LEVEL = 10000 |
| |
| |
| def logger(): |
| """Return the main logger for this module.""" |
| return logging.getLogger(__name__) |
| |
| |
| def get_tags(line): |
| """Returns a list of all tags on this line.""" |
| _, _, all_tags = line.strip().partition('#') |
| return [e for e in re.split(r'\s+', all_tags) if e.strip()] |
| |
| |
| def is_api_level_tag(tag): |
| """Returns true if this tag has an API level that may need decoding.""" |
| if tag.startswith('introduced='): |
| return True |
| if tag.startswith('introduced-'): |
| return True |
| if tag.startswith('versioned='): |
| return True |
| return False |
| |
| |
| def decode_api_level_tags(tags, api_map): |
| """Decodes API level code names in a list of tags. |
| |
| Raises: |
| ParseError: An unknown version name was found in a tag. |
| """ |
| for idx, tag in enumerate(tags): |
| if not is_api_level_tag(tag): |
| continue |
| name, value = split_tag(tag) |
| |
| try: |
| decoded = str(decode_api_level(value, api_map)) |
| tags[idx] = '='.join([name, decoded]) |
| except KeyError: |
| raise ParseError('Unknown version name in tag: {}'.format(tag)) |
| return tags |
| |
| |
| def split_tag(tag): |
| """Returns a key/value tuple of the tag. |
| |
| Raises: |
| ValueError: Tag is not a key/value type tag. |
| |
| Returns: Tuple of (key, value) of the tag. Both components are strings. |
| """ |
| if '=' not in tag: |
| raise ValueError('Not a key/value tag: ' + tag) |
| key, _, value = tag.partition('=') |
| return key, value |
| |
| |
| def get_tag_value(tag): |
| """Returns the value of a key/value tag. |
| |
| Raises: |
| ValueError: Tag is not a key/value type tag. |
| |
| Returns: Value part of tag as a string. |
| """ |
| return split_tag(tag)[1] |
| |
| |
| def version_is_private(version): |
| """Returns True if the version name should be treated as private.""" |
| return version.endswith('_PRIVATE') or version.endswith('_PLATFORM') |
| |
| |
| def should_omit_version(name, tags, arch, api, vndk): |
| """Returns True if the version section should be ommitted. |
| |
| We want to omit any sections that do not have any symbols we'll have in the |
| stub library. Sections that contain entirely future symbols or only symbols |
| for certain architectures. |
| """ |
| if version_is_private(name): |
| return True |
| if 'platform-only' in tags: |
| return True |
| if 'vndk' in tags and not vndk: |
| return True |
| if not symbol_in_arch(tags, arch): |
| return True |
| if not symbol_in_api(tags, arch, api): |
| return True |
| return False |
| |
| |
| def symbol_in_arch(tags, arch): |
| """Returns true if the symbol is present for the given architecture.""" |
| has_arch_tags = False |
| for tag in tags: |
| if tag == arch: |
| return True |
| if tag in ALL_ARCHITECTURES: |
| has_arch_tags = True |
| |
| # If there were no arch tags, the symbol is available for all |
| # architectures. If there were any arch tags, the symbol is only available |
| # for the tagged architectures. |
| return not has_arch_tags |
| |
| |
| def symbol_in_api(tags, arch, api): |
| """Returns true if the symbol is present for the given API level.""" |
| introduced_tag = None |
| arch_specific = False |
| for tag in tags: |
| # If there is an arch-specific tag, it should override the common one. |
| if tag.startswith('introduced=') and not arch_specific: |
| introduced_tag = tag |
| elif tag.startswith('introduced-' + arch + '='): |
| introduced_tag = tag |
| arch_specific = True |
| elif tag == 'future': |
| return api == FUTURE_API_LEVEL |
| |
| if introduced_tag is None: |
| # We found no "introduced" tags, so the symbol has always been |
| # available. |
| return True |
| |
| return api >= int(get_tag_value(introduced_tag)) |
| |
| |
| def symbol_versioned_in_api(tags, api): |
| """Returns true if the symbol should be versioned for the given API. |
| |
| This models the `versioned=API` tag. This should be a very uncommonly |
| needed tag, and is really only needed to fix versioning mistakes that are |
| already out in the wild. |
| |
| For example, some of libc's __aeabi_* functions were originally placed in |
| the private version, but that was incorrect. They are now in LIBC_N, but |
| when building against any version prior to N we need the symbol to be |
| unversioned (otherwise it won't resolve on M where it is private). |
| """ |
| for tag in tags: |
| if tag.startswith('versioned='): |
| return api >= int(get_tag_value(tag)) |
| # If there is no "versioned" tag, the tag has been versioned for as long as |
| # it was introduced. |
| return True |
| |
| |
| class ParseError(RuntimeError): |
| """An error that occurred while parsing a symbol file.""" |
| pass |
| |
| |
| class Version(object): |
| """A version block of a symbol file.""" |
| def __init__(self, name, base, tags, symbols): |
| self.name = name |
| self.base = base |
| self.tags = tags |
| self.symbols = symbols |
| |
| def __eq__(self, other): |
| if self.name != other.name: |
| return False |
| if self.base != other.base: |
| return False |
| if self.tags != other.tags: |
| return False |
| if self.symbols != other.symbols: |
| return False |
| return True |
| |
| |
| class Symbol(object): |
| """A symbol definition from a symbol file.""" |
| def __init__(self, name, tags): |
| self.name = name |
| self.tags = tags |
| |
| def __eq__(self, other): |
| return self.name == other.name and set(self.tags) == set(other.tags) |
| |
| |
| class SymbolFileParser(object): |
| """Parses NDK symbol files.""" |
| def __init__(self, input_file, api_map): |
| self.input_file = input_file |
| self.api_map = api_map |
| self.current_line = None |
| |
| def parse(self): |
| """Parses the symbol file and returns a list of Version objects.""" |
| versions = [] |
| while self.next_line() != '': |
| if '{' in self.current_line: |
| versions.append(self.parse_version()) |
| else: |
| raise ParseError( |
| 'Unexpected contents at top level: ' + self.current_line) |
| return versions |
| |
| def parse_version(self): |
| """Parses a single version section and returns a Version object.""" |
| name = self.current_line.split('{')[0].strip() |
| tags = get_tags(self.current_line) |
| tags = decode_api_level_tags(tags, self.api_map) |
| symbols = [] |
| global_scope = True |
| cpp_symbols = False |
| while self.next_line() != '': |
| if '}' in self.current_line: |
| # Line is something like '} BASE; # tags'. Both base and tags |
| # are optional here. |
| base = self.current_line.partition('}')[2] |
| base = base.partition('#')[0].strip() |
| if not base.endswith(';'): |
| raise ParseError( |
| 'Unterminated version/export "C++" block (expected ;).') |
| if cpp_symbols: |
| cpp_symbols = False |
| else: |
| base = base.rstrip(';').rstrip() |
| if base == '': |
| base = None |
| return Version(name, base, tags, symbols) |
| elif 'extern "C++" {' in self.current_line: |
| cpp_symbols = True |
| elif not cpp_symbols and ':' in self.current_line: |
| visibility = self.current_line.split(':')[0].strip() |
| if visibility == 'local': |
| global_scope = False |
| elif visibility == 'global': |
| global_scope = True |
| else: |
| raise ParseError('Unknown visiblity label: ' + visibility) |
| elif global_scope and not cpp_symbols: |
| symbols.append(self.parse_symbol()) |
| else: |
| # We're in a hidden scope or in 'extern "C++"' block. Ignore everything. |
| pass |
| raise ParseError('Unexpected EOF in version block.') |
| |
| def parse_symbol(self): |
| """Parses a single symbol line and returns a Symbol object.""" |
| if ';' not in self.current_line: |
| raise ParseError( |
| 'Expected ; to terminate symbol: ' + self.current_line) |
| if '*' in self.current_line: |
| raise ParseError( |
| 'Wildcard global symbols are not permitted.') |
| # Line is now in the format "<symbol-name>; # tags" |
| name, _, _ = self.current_line.strip().partition(';') |
| tags = get_tags(self.current_line) |
| tags = decode_api_level_tags(tags, self.api_map) |
| return Symbol(name, tags) |
| |
| def next_line(self): |
| """Returns the next non-empty non-comment line. |
| |
| A return value of '' indicates EOF. |
| """ |
| line = self.input_file.readline() |
| while line.strip() == '' or line.strip().startswith('#'): |
| line = self.input_file.readline() |
| |
| # We want to skip empty lines, but '' indicates EOF. |
| if line == '': |
| break |
| self.current_line = line |
| return self.current_line |
| |
| |
| class Generator(object): |
| """Output generator that writes stub source files and version scripts.""" |
| def __init__(self, src_file, version_script, arch, api, vndk): |
| self.src_file = src_file |
| self.version_script = version_script |
| self.arch = arch |
| self.api = api |
| self.vndk = vndk |
| |
| 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.""" |
| name = version.name |
| tags = version.tags |
| if should_omit_version(name, tags, self.arch, self.api, self.vndk): |
| return |
| |
| section_versioned = symbol_versioned_in_api(tags, self.api) |
| version_empty = True |
| pruned_symbols = [] |
| for symbol in version.symbols: |
| if not self.vndk and 'vndk' in symbol.tags: |
| continue |
| if not symbol_in_arch(symbol.tags, self.arch): |
| continue |
| if not symbol_in_api(symbol.tags, self.arch, self.api): |
| continue |
| |
| if 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 = 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 decode_api_level(api, api_map): |
| """Decodes the API level argument into the API level number. |
| |
| For the average case, this just decodes the integer value from the string, |
| but for unreleased APIs we need to translate from the API codename (like |
| "O") to the future API level for that codename. |
| """ |
| try: |
| return int(api) |
| except ValueError: |
| pass |
| |
| if api == "current": |
| return FUTURE_API_LEVEL |
| |
| return api_map[api] |
| |
| |
| 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=ALL_ARCHITECTURES, required=True, |
| help='Architecture being targeted.') |
| parser.add_argument( |
| '--vndk', action='store_true', help='Use the VNDK 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 = 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: |
| versions = SymbolFileParser(symbol_file, api_map).parse() |
| |
| 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.vndk) |
| generator.write(versions) |
| |
| |
| if __name__ == '__main__': |
| main() |