scripts/glibcsymbols.py: Extract from scripts/move-symbol-to-libc.py

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

1 files changed, 80 insertions, 0 deletions

diff --git a/scripts/glibcsymbols.py b/scripts/glibcsymbols.py
new file mode 100644
index 0000000000..e329ead7f2
--- /dev/null
+++ b/scripts/glibcsymbols.py
@@ -0,0 +1,80 @@
+#!/usr/bin/python3
+# Processing of symbols and abilist files.
+# Copyright (C) 2020-2021 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+#
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <https://www.gnu.org/licenses/>.
+
+"""Symbol processing for glibc."""
+
+import os
+
+def replace_file(path, new_contents):
+    """Atomically replace PATH with lines from NEW_CONTENTS.
+
+    NEW_CONTENTS must be a sequence of strings.
+
+    """
+    temppath = path + 'T'
+    with open(temppath, 'w') as out:
+        for line in new_contents:
+            out.write(line)
+    os.rename(temppath, path)
+
+class VersionedSymbol:
+    """A combination of a symbol and its version."""
+
+    def __init__(self, symbol, version):
+        """Construct a new versioned symbol."""
+        assert symbol
+        assert version
+        self.symbol = symbol
+        self.version = version
+
+    def __str__(self):
+        return self.symbol + '@' + self.version
+
+    def __eq__(self, other):
+        return self.symbol == other.symbol and self.version == other.version
+
+    def __hash__(self):
+        return hash(self.symbol) ^ hash(self.version)
+
+def read_abilist(path):
+    """Read the abilist file at PATH.
+
+    Return a dictionary from VersionedSymbols to their flags (as
+    strings).
+
+    """
+    result = {}
+    with open(path) as inp:
+        for line in inp:
+            version, symbol, flags = line.strip().split(' ', 2)
+            result[VersionedSymbol(symbol, version)] = flags
+    return result
+
+def abilist_lines(symbols):
+    """Build the abilist file contents (as a list of lines).
+
+    SYMBOLS is a dictionary from VersionedSymbols to their flags.
+
+    """
+    result = []
+    for versym, flags in symbols.items():
+        result.append('{} {} {}\n'.format(
+            versym.version, versym.symbol, flags))
+    result.sort()
+    return result