914449fca8
The list of migrated libraries is currently empty. Libraries will be
migrated as follow up patches.
Test: Migrated libc to this system and everything still builds.
build.ninja shows libraries being built and used and headers are
collected for the sysroot.
Bug: http://b/27533932
Change-Id: Iaba00543c1390f432befe0eed768ed3fbb8a9b96
262 lines
8 KiB
Python
Executable file
262 lines
8 KiB
Python
Executable file
#!/usr/bin/env python
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#
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# Copyright (C) 2016 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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"""Generates source for stub shared libraries for the NDK."""
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import argparse
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import os
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import re
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ALL_ARCHITECTURES = (
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'arm',
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'arm64',
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'mips',
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'mips64',
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'x86',
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'x86_64',
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)
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class Scope(object):
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"""Enum for version script scope.
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Top: Top level of the file.
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Global: In a version and visibility section where symbols should be visible
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to the NDK.
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Local: In a visibility section of a public version where symbols should be
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hidden to the NDK.
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Private: In a version where symbols should not be visible to the NDK.
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"""
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Top = 1
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Global = 2
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Local = 3
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Private = 4
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class Stack(object):
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"""Basic stack implementation."""
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def __init__(self):
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self.stack = []
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def push(self, obj):
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"""Push an item on to the stack."""
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self.stack.append(obj)
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def pop(self):
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"""Remove and return the item on the top of the stack."""
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return self.stack.pop()
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@property
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def top(self):
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"""Return the top of the stack."""
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return self.stack[-1]
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def version_is_private(version):
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"""Returns True if the version name should be treated as private."""
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return version.endswith('_PRIVATE') or version.endswith('_PLATFORM')
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def enter_version(scope, line, version_file):
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"""Enters a new version block scope."""
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if scope.top != Scope.Top:
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raise RuntimeError('Encountered nested version block.')
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# Entering a new version block. By convention symbols with versions ending
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# with "_PRIVATE" or "_PLATFORM" are not included in the NDK.
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version_name = line.split('{')[0].strip()
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if version_is_private(version_name):
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scope.push(Scope.Private)
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else:
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scope.push(Scope.Global) # By default symbols are visible.
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version_file.write(line)
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def leave_version(scope, line, version_file):
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"""Leave a version block scope."""
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# There is no close to a visibility section, just the end of the version or
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# a new visiblity section.
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assert scope.top in (Scope.Global, Scope.Local, Scope.Private)
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if scope.top != Scope.Private:
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version_file.write(line)
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scope.pop()
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assert scope.top == Scope.Top
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def enter_visibility(scope, line, version_file):
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"""Enters a new visibility block scope."""
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leave_visibility(scope)
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version_file.write(line)
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visibility = line.split(':')[0].strip()
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if visibility == 'local':
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scope.push(Scope.Local)
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elif visibility == 'global':
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scope.push(Scope.Global)
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else:
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raise RuntimeError('Unknown visiblity label: ' + visibility)
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def leave_visibility(scope):
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"""Leaves a visibility block scope."""
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assert scope.top in (Scope.Global, Scope.Local)
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scope.pop()
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assert scope.top == Scope.Top
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def handle_top_scope(scope, line, version_file):
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"""Processes a line in the top level scope."""
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if '{' in line:
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enter_version(scope, line, version_file)
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else:
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raise RuntimeError('Unexpected contents at top level: ' + line)
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def handle_private_scope(scope, line, version_file):
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"""Eats all input."""
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if '}' in line:
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leave_version(scope, line, version_file)
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def handle_local_scope(scope, line, version_file):
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"""Passes through input."""
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if ':' in line:
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enter_visibility(scope, line, version_file)
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elif '}' in line:
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leave_version(scope, line, version_file)
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else:
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version_file.write(line)
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def symbol_in_arch(tags, arch):
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"""Returns true if the symbol is present for the given architecture."""
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has_arch_tags = False
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for tag in tags:
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if tag == arch:
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return True
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if tag in ALL_ARCHITECTURES:
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has_arch_tags = True
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# If there were no arch tags, the symbol is available for all
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# architectures. If there were any arch tags, the symbol is only available
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# for the tagged architectures.
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return not has_arch_tags
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def symbol_in_version(tags, arch, version):
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"""Returns true if the symbol is present for the given version."""
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introduced_tag = None
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arch_specific = False
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for tag in tags:
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# If there is an arch-specific tag, it should override the common one.
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if tag.startswith('introduced=') and not arch_specific:
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introduced_tag = tag
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elif tag.startswith('introduced-' + arch + '='):
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introduced_tag = tag
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arch_specific = True
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if introduced_tag is None:
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# We found no "introduced" tags, so the symbol has always been
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# available.
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return True
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# The tag is a key=value pair, and we only care about the value now.
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_, _, version_str = introduced_tag.partition('=')
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return version >= int(version_str)
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def handle_global_scope(scope, line, src_file, version_file, arch, api):
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"""Emits present symbols to the version file and stub source file."""
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if ':' in line:
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enter_visibility(scope, line, version_file)
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return
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if '}' in line:
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leave_version(scope, line, version_file)
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return
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if ';' not in line:
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raise RuntimeError('Expected ; to terminate symbol: ' + line)
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if '*' in line:
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raise RuntimeError('Wildcard global symbols are not permitted.')
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# Line is now in the format "<symbol-name>; # tags"
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# Tags are whitespace separated.
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symbol_name, _, rest = line.strip().partition(';')
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_, _, all_tags = rest.partition('#')
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tags = re.split(r'\s+', all_tags)
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if not symbol_in_arch(tags, arch):
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return
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if not symbol_in_version(tags, arch, api):
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return
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if 'var' in tags:
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src_file.write('int {} = 0;\n'.format(symbol_name))
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else:
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src_file.write('void {}() {{}}\n'.format(symbol_name))
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version_file.write(line)
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def generate(symbol_file, src_file, version_file, arch, api):
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"""Generates the stub source file and version script."""
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scope = Stack()
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scope.push(Scope.Top)
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for line in symbol_file:
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if line.strip() == '' or line.strip().startswith('#'):
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version_file.write(line)
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elif scope.top == Scope.Top:
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handle_top_scope(scope, line, version_file)
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elif scope.top == Scope.Private:
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handle_private_scope(scope, line, version_file)
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elif scope.top == Scope.Local:
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handle_local_scope(scope, line, version_file)
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elif scope.top == Scope.Global:
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handle_global_scope(scope, line, src_file, version_file, arch, api)
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def parse_args():
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"""Parses and returns command line arguments."""
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parser = argparse.ArgumentParser()
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parser.add_argument('--api', type=int, help='API level being targeted.')
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parser.add_argument(
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'--arch', choices=ALL_ARCHITECTURES,
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help='Architecture being targeted.')
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parser.add_argument(
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'symbol_file', type=os.path.realpath, help='Path to symbol file.')
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parser.add_argument(
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'stub_src', type=os.path.realpath,
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help='Path to output stub source file.')
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parser.add_argument(
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'version_script', type=os.path.realpath,
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help='Path to output version script.')
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return parser.parse_args()
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def main():
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"""Program entry point."""
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args = parse_args()
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with open(args.symbol_file) as symbol_file:
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with open(args.stub_src, 'w') as src_file:
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with open(args.version_script, 'w') as version_file:
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generate(symbol_file, src_file, version_file, args.arch,
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args.api)
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if __name__ == '__main__':
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main()
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