gdb libpython.py: Remove compatibility code (#105739)

Remove compatibility code for Python 2 and early Python 3 versions.

* Remove os_fsencode() reimplementation: use os.fsencode() directly.
  os.fsencode() was added to Python 3.2.
* Remove references to Python 2 and "Python 3": just say "Python".
* Remove outdated u'' string format: use '' instead.

1 files changed, 22 insertions, 47 deletions

diff --git a/Tools/gdb/libpython.py b/Tools/gdb/libpython.py
index 79b8c75..6225d31 100755
--- a/Tools/gdb/libpython.py
+++ b/Tools/gdb/libpython.py
@@ -111,26 +111,6 @@ def safe_range(val):
     # threshold in case the data was corrupted
     return range(safety_limit(int(val)))
 
-try:
-    os_fsencode = os.fsencode
-except AttributeError:
-    def os_fsencode(filename):
-        if not isinstance(filename, unicode):
-            return filename
-        encoding = sys.getfilesystemencoding()
-        if encoding == 'mbcs':
-            # mbcs doesn't support surrogateescape
-            return filename.encode(encoding)
-        encoded = []
-        for char in filename:
-            # surrogateescape error handler
-            if 0xDC80 <= ord(char) <= 0xDCFF:
-                byte = chr(ord(char) - 0xDC00)
-            else:
-                byte = char.encode(encoding)
-            encoded.append(byte)
-        return ''.join(encoded)
-
 class StringTruncated(RuntimeError):
     pass
 
@@ -174,16 +154,12 @@ class PyObjectPtr(object):
 
     def field(self, name):
         '''
-        Get the gdb.Value for the given field within the PyObject, coping with
-        some python 2 versus python 3 differences.
+        Get the gdb.Value for the given field within the PyObject.
 
         Various libpython types are defined using the "PyObject_HEAD" and
         "PyObject_VAR_HEAD" macros.
 
-        In Python 2, this these are defined so that "ob_type" and (for a var
-        object) "ob_size" are fields of the type in question.
-
-        In Python 3, this is defined as an embedded PyVarObject type thus:
+        In Python, this is defined as an embedded PyVarObject type thus:
            PyVarObject ob_base;
         so that the "ob_size" field is located insize the "ob_base" field, and
         the "ob_type" is most easily accessed by casting back to a (PyObject*).
@@ -204,8 +180,7 @@ class PyObjectPtr(object):
 
     def pyop_field(self, name):
         '''
-        Get a PyObjectPtr for the given PyObject* field within this PyObject,
-        coping with some python 2 versus python 3 differences.
+        Get a PyObjectPtr for the given PyObject* field within this PyObject.
         '''
         return PyObjectPtr.from_pyobject_ptr(self.field(name))
 
@@ -924,7 +899,7 @@ class PyLongObjectPtr(PyObjectPtr):
         return result
 
     def write_repr(self, out, visited):
-        # Write this out as a Python 3 int literal, i.e. without the "L" suffix
+        # Write this out as a Python int literal
         proxy = self.proxyval(visited)
         out.write("%s" % proxy)
 
@@ -1170,7 +1145,7 @@ class PyFramePtr:
 
         filename = self.filename()
         try:
-            with open(os_fsencode(filename), 'r', encoding="utf-8") as fp:
+            with open(os.fsencode(filename), 'r', encoding="utf-8") as fp:
                 lines = fp.readlines()
         except IOError:
             return None
@@ -1263,7 +1238,7 @@ class PySetObjectPtr(PyObjectPtr):
             return set(members)
 
     def write_repr(self, out, visited):
-        # Emulate Python 3's set_repr
+        # Emulate Python's set_repr
         tp_name = self.safe_tp_name()
 
         # Guard against infinite loops:
@@ -1272,13 +1247,13 @@ class PySetObjectPtr(PyObjectPtr):
             return
         visited.add(self.as_address())
 
-        # Python 3's set_repr special-cases the empty set:
+        # Python's set_repr special-cases the empty set:
         if not self.field('used'):
             out.write(tp_name)
             out.write('()')
             return
 
-        # Python 3 uses {} for set literals:
+        # Python uses {} for set literals:
         if tp_name != 'set':
             out.write(tp_name)
             out.write('(')
@@ -1309,13 +1284,13 @@ class PyBytesObjectPtr(PyObjectPtr):
         return str(self)
 
     def write_repr(self, out, visited):
-        # Write this out as a Python 3 bytes literal, i.e. with a "b" prefix
+        # Write this out as a Python bytes literal, i.e. with a "b" prefix
 
-        # Get a PyStringObject* within the Python 2 gdb process:
+        # Get a PyStringObject* within the Python gdb process:
         proxy = self.proxyval(visited)
 
-        # Transliteration of Python 3's Objects/bytesobject.c:PyBytes_Repr
-        # to Python 2 code:
+        # Transliteration of Python's Objects/bytesobject.c:PyBytes_Repr
+        # to Python code:
         quote = "'"
         if "'" in proxy and not '"' in proxy:
             quote = '"'
@@ -1380,7 +1355,7 @@ class PyTypeObjectPtr(PyObjectPtr):
 
 
 def _unichr_is_printable(char):
-    # Logic adapted from Python 3's Tools/unicode/makeunicodedata.py
+    # Logic adapted from Python's Tools/unicode/makeunicodedata.py
     if char == u" ":
         return True
     import unicodedata
@@ -1416,17 +1391,17 @@ class PyUnicodeObjectPtr(PyObjectPtr):
 
         # Convert the int code points to unicode characters, and generate a
         # local unicode instance.
-        result = u''.join(map(chr, code_points))
+        result = ''.join(map(chr, code_points))
         return result
 
     def write_repr(self, out, visited):
-        # Write this out as a Python 3 str literal, i.e. without a "u" prefix
+        # Write this out as a Python str literal
 
-        # Get a PyUnicodeObject* within the Python 2 gdb process:
+        # Get a PyUnicodeObject* within the Python gdb process:
         proxy = self.proxyval(visited)
 
-        # Transliteration of Python 3's Object/unicodeobject.c:unicode_repr
-        # to Python 2:
+        # Transliteration of Python's Object/unicodeobject.c:unicode_repr
+        # to Python:
         if "'" in proxy and '"' not in proxy:
             quote = '"'
         else:
@@ -1477,7 +1452,7 @@ class PyUnicodeObjectPtr(PyObjectPtr):
                 # (categories Z* and C* except ASCII space)
                 if not printable:
                     if ch2 is not None:
-                        # Match Python 3's representation of non-printable
+                        # Match Python's representation of non-printable
                         # wide characters.
                         code = (ord(ch) & 0x03FF) << 10
                         code |= ord(ch2) & 0x03FF
@@ -1608,8 +1583,8 @@ The following code should ensure that the prettyprinter is registered
 if the code is autoloaded by gdb when visiting libpython.so, provided
 that this python file is installed to the same path as the library (or its
 .debug file) plus a "-gdb.py" suffix, e.g:
-  /usr/lib/libpython2.6.so.1.0-gdb.py
-  /usr/lib/debug/usr/lib/libpython2.6.so.1.0.debug-gdb.py
+  /usr/lib/libpython3.12.so.1.0-gdb.py
+  /usr/lib/debug/usr/lib/libpython3.12.so.1.0.debug-gdb.py
 """
 def register (obj):
     if obj is None:
@@ -1928,7 +1903,7 @@ class PyList(gdb.Command):
             start = 1
 
         try:
-            f = open(os_fsencode(filename), 'r', encoding="utf-8")
+            f = open(os.fsencode(filename), 'r', encoding="utf-8")
         except IOError as err:
             sys.stdout.write('Unable to open %s: %s\n'
                              % (filename, err))