mirror of
https://sourceware.org/git/binutils-gdb.git
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8a0b60471a
Convert the gdbpy_err_fetch class to make use of gdbpy_ref, this removes the need for manual reference count management, and allows the destructor to be removed. There should be no functional change after this commit. I think this cleanup is worth doing on its own, however, in a later commit I will want to copy instances of gdbpy_err_fetch, and switching to using gdbpy_ref means that I can rely on the default copy constructor, without having to add one that handles the reference counts, so this is good preparation for that upcoming change.
597 lines
18 KiB
C
597 lines
18 KiB
C
/* General utility routines for GDB/Python.
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Copyright (C) 2008-2022 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "charset.h"
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#include "value.h"
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#include "python-internal.h"
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/* Converts a Python 8-bit string to a unicode string object. Assumes the
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8-bit string is in the host charset. If an error occurs during conversion,
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returns NULL with a python exception set.
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As an added bonus, the functions accepts a unicode string and returns it
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right away, so callers don't need to check which kind of string they've
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got. In Python 3, all strings are Unicode so this case is always the
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one that applies.
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If the given object is not one of the mentioned string types, NULL is
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returned, with the TypeError python exception set. */
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gdbpy_ref<>
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python_string_to_unicode (PyObject *obj)
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{
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PyObject *unicode_str;
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/* If obj is already a unicode string, just return it.
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I wish life was always that simple... */
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if (PyUnicode_Check (obj))
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{
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unicode_str = obj;
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Py_INCREF (obj);
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}
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else
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{
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PyErr_SetString (PyExc_TypeError,
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_("Expected a string object."));
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unicode_str = NULL;
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}
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return gdbpy_ref<> (unicode_str);
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}
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/* Returns a newly allocated string with the contents of the given unicode
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string object converted to CHARSET. If an error occurs during the
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conversion, NULL will be returned and a python exception will be
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set. */
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static gdb::unique_xmalloc_ptr<char>
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unicode_to_encoded_string (PyObject *unicode_str, const char *charset)
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{
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/* Translate string to named charset. */
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gdbpy_ref<> string (PyUnicode_AsEncodedString (unicode_str, charset, NULL));
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if (string == NULL)
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return NULL;
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return gdb::unique_xmalloc_ptr<char>
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(xstrdup (PyBytes_AsString (string.get ())));
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}
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/* Returns a PyObject with the contents of the given unicode string
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object converted to a named charset. If an error occurs during
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the conversion, NULL will be returned and a python exception will
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be set. */
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static gdbpy_ref<>
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unicode_to_encoded_python_string (PyObject *unicode_str, const char *charset)
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{
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/* Translate string to named charset. */
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return gdbpy_ref<> (PyUnicode_AsEncodedString (unicode_str, charset, NULL));
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}
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/* Returns a newly allocated string with the contents of the given
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unicode string object converted to the target's charset. If an
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error occurs during the conversion, NULL will be returned and a
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python exception will be set. */
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gdb::unique_xmalloc_ptr<char>
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unicode_to_target_string (PyObject *unicode_str)
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{
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return (unicode_to_encoded_string
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(unicode_str,
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target_charset (gdbpy_enter::get_gdbarch ())));
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}
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/* Returns a PyObject with the contents of the given unicode string
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object converted to the target's charset. If an error occurs
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during the conversion, NULL will be returned and a python exception
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will be set. */
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static gdbpy_ref<>
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unicode_to_target_python_string (PyObject *unicode_str)
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{
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return (unicode_to_encoded_python_string
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(unicode_str,
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target_charset (gdbpy_enter::get_gdbarch ())));
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}
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/* Converts a python string (8-bit or unicode) to a target string in
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the target's charset. Returns NULL on error, with a python
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exception set. */
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gdb::unique_xmalloc_ptr<char>
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python_string_to_target_string (PyObject *obj)
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{
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gdbpy_ref<> str = python_string_to_unicode (obj);
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if (str == NULL)
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return NULL;
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return unicode_to_target_string (str.get ());
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}
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/* Converts a python string (8-bit or unicode) to a target string in the
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target's charset. Returns NULL on error, with a python exception
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set.
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In Python 3, the returned object is a "bytes" object (not a string). */
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gdbpy_ref<>
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python_string_to_target_python_string (PyObject *obj)
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{
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gdbpy_ref<> str = python_string_to_unicode (obj);
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if (str == NULL)
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return str;
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return unicode_to_target_python_string (str.get ());
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}
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/* Converts a python string (8-bit or unicode) to a target string in
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the host's charset. Returns NULL on error, with a python exception
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set. */
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gdb::unique_xmalloc_ptr<char>
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python_string_to_host_string (PyObject *obj)
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{
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gdbpy_ref<> str = python_string_to_unicode (obj);
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if (str == NULL)
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return NULL;
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return unicode_to_encoded_string (str.get (), host_charset ());
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}
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/* Convert a host string to a python string. */
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gdbpy_ref<>
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host_string_to_python_string (const char *str)
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{
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return gdbpy_ref<> (PyUnicode_Decode (str, strlen (str), host_charset (),
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NULL));
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}
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/* Return true if OBJ is a Python string or unicode object, false
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otherwise. */
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int
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gdbpy_is_string (PyObject *obj)
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{
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return PyUnicode_Check (obj);
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}
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/* Return the string representation of OBJ, i.e., str (obj).
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If the result is NULL a python error occurred, the caller must clear it. */
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gdb::unique_xmalloc_ptr<char>
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gdbpy_obj_to_string (PyObject *obj)
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{
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gdbpy_ref<> str_obj (PyObject_Str (obj));
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if (str_obj != NULL)
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return python_string_to_host_string (str_obj.get ());
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return NULL;
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}
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/* See python-internal.h. */
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gdb::unique_xmalloc_ptr<char>
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gdbpy_err_fetch::to_string () const
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{
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/* There are a few cases to consider.
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For example:
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value is a string when PyErr_SetString is used.
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value is not a string when raise "foo" is used, instead it is None
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and type is "foo".
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So the algorithm we use is to print `str (value)' if it's not
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None, otherwise we print `str (type)'.
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Using str (aka PyObject_Str) will fetch the error message from
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gdb.GdbError ("message"). */
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if (m_error_value.get () != nullptr && m_error_value.get () != Py_None)
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return gdbpy_obj_to_string (m_error_value.get ());
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else
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return gdbpy_obj_to_string (m_error_type.get ());
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}
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/* See python-internal.h. */
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gdb::unique_xmalloc_ptr<char>
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gdbpy_err_fetch::type_to_string () const
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{
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return gdbpy_obj_to_string (m_error_type.get ());
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}
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/* Convert a GDB exception to the appropriate Python exception.
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This sets the Python error indicator. */
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void
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gdbpy_convert_exception (const struct gdb_exception &exception)
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{
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PyObject *exc_class;
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if (exception.reason == RETURN_QUIT)
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exc_class = PyExc_KeyboardInterrupt;
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else if (exception.error == MEMORY_ERROR)
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exc_class = gdbpy_gdb_memory_error;
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else
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exc_class = gdbpy_gdb_error;
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PyErr_Format (exc_class, "%s", exception.what ());
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}
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/* Converts OBJ to a CORE_ADDR value.
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Returns 0 on success or -1 on failure, with a Python exception set.
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*/
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int
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get_addr_from_python (PyObject *obj, CORE_ADDR *addr)
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{
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if (gdbpy_is_value_object (obj))
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{
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try
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{
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*addr = value_as_address (value_object_to_value (obj));
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}
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catch (const gdb_exception &except)
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{
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GDB_PY_SET_HANDLE_EXCEPTION (except);
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}
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}
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else
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{
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gdbpy_ref<> num (PyNumber_Long (obj));
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gdb_py_ulongest val;
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if (num == NULL)
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return -1;
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val = gdb_py_long_as_ulongest (num.get ());
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if (PyErr_Occurred ())
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return -1;
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if (sizeof (val) > sizeof (CORE_ADDR) && ((CORE_ADDR) val) != val)
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{
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PyErr_SetString (PyExc_ValueError,
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_("Overflow converting to address."));
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return -1;
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}
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*addr = val;
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}
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return 0;
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}
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/* Convert a LONGEST to the appropriate Python object -- either an
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integer object or a long object, depending on its value. */
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gdbpy_ref<>
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gdb_py_object_from_longest (LONGEST l)
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{
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if (sizeof (l) > sizeof (long))
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return gdbpy_ref<> (PyLong_FromLongLong (l));
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return gdbpy_ref<> (PyLong_FromLong (l));
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}
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/* Convert a ULONGEST to the appropriate Python object -- either an
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integer object or a long object, depending on its value. */
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gdbpy_ref<>
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gdb_py_object_from_ulongest (ULONGEST l)
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{
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if (sizeof (l) > sizeof (unsigned long))
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return gdbpy_ref<> (PyLong_FromUnsignedLongLong (l));
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return gdbpy_ref<> (PyLong_FromUnsignedLong (l));
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}
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/* Like PyLong_AsLong, but returns 0 on failure, 1 on success, and puts
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the value into an out parameter. */
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int
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gdb_py_int_as_long (PyObject *obj, long *result)
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{
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*result = PyLong_AsLong (obj);
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return ! (*result == -1 && PyErr_Occurred ());
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}
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/* Generic implementation of the __dict__ attribute for objects that
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have a dictionary. The CLOSURE argument should be the type object.
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This only handles positive values for tp_dictoffset. */
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PyObject *
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gdb_py_generic_dict (PyObject *self, void *closure)
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{
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PyObject *result;
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PyTypeObject *type_obj = (PyTypeObject *) closure;
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char *raw_ptr;
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raw_ptr = (char *) self + type_obj->tp_dictoffset;
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result = * (PyObject **) raw_ptr;
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Py_INCREF (result);
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return result;
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}
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/* Like PyModule_AddObject, but does not steal a reference to
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OBJECT. */
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int
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gdb_pymodule_addobject (PyObject *module, const char *name, PyObject *object)
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{
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int result;
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Py_INCREF (object);
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result = PyModule_AddObject (module, name, object);
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if (result < 0)
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Py_DECREF (object);
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return result;
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}
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/* See python-internal.h. */
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void
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gdbpy_error (const char *fmt, ...)
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{
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va_list ap;
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va_start (ap, fmt);
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std::string str = string_vprintf (fmt, ap);
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va_end (ap);
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const char *msg = str.c_str ();
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if (msg != nullptr && *msg != '\0')
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error (_("Error occurred in Python: %s"), msg);
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else
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error (_("Error occurred in Python."));
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}
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/* Handle a Python exception when the special gdb.GdbError treatment
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is desired. This should only be called when an exception is set.
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If the exception is a gdb.GdbError, throw a gdb exception with the
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exception text. For other exceptions, print the Python stack and
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then throw a gdb exception. */
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void
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gdbpy_handle_exception ()
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{
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gdbpy_err_fetch fetched_error;
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gdb::unique_xmalloc_ptr<char> msg = fetched_error.to_string ();
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if (msg == NULL)
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{
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/* An error occurred computing the string representation of the
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error message. This is rare, but we should inform the user. */
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gdb_printf (_("An error occurred in Python "
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"and then another occurred computing the "
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"error message.\n"));
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gdbpy_print_stack ();
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}
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/* Don't print the stack for gdb.GdbError exceptions.
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It is generally used to flag user errors.
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We also don't want to print "Error occurred in Python command"
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for user errors. However, a missing message for gdb.GdbError
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exceptions is arguably a bug, so we flag it as such. */
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if (fetched_error.type_matches (PyExc_KeyboardInterrupt))
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throw_quit ("Quit");
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else if (! fetched_error.type_matches (gdbpy_gdberror_exc)
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|| msg == NULL || *msg == '\0')
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{
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fetched_error.restore ();
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gdbpy_print_stack ();
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if (msg != NULL && *msg != '\0')
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error (_("Error occurred in Python: %s"), msg.get ());
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else
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error (_("Error occurred in Python."));
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}
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else
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error ("%s", msg.get ());
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}
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/* See python-internal.h. */
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gdb::unique_xmalloc_ptr<char>
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gdbpy_fix_doc_string_indentation (gdb::unique_xmalloc_ptr<char> doc)
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{
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/* A structure used to track the white-space information on each line of
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DOC. */
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struct line_whitespace
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{
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/* Constructor. OFFSET is the offset from the start of DOC, WS_COUNT
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is the number of whitespace characters starting at OFFSET. */
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line_whitespace (size_t offset, int ws_count)
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: m_offset (offset),
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m_ws_count (ws_count)
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{ /* Nothing. */ }
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/* The offset from the start of DOC. */
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size_t offset () const
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{ return m_offset; }
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/* The number of white-space characters at the start of this line. */
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int ws () const
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{ return m_ws_count; }
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private:
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/* The offset from the start of DOC to the first character of this
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line. */
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size_t m_offset;
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/* White space count on this line, the first character of this
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whitespace is at OFFSET. */
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int m_ws_count;
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};
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/* Count the number of white-space character starting at TXT. We
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currently only count true single space characters, things like tabs,
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newlines, etc are not counted. */
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auto count_whitespace = [] (const char *txt) -> int
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{
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int count = 0;
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while (*txt == ' ')
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{
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++txt;
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++count;
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}
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return count;
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};
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/* In MIN_WHITESPACE we track the smallest number of whitespace
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characters seen at the start of a line (that has actual content), this
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is the number of characters that we can delete off all lines without
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altering the relative indentation of all lines in DOC.
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The first line often has no indentation, but instead starts immediates
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after the 3-quotes marker within the Python doc string, so, if the
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first line has zero white-space then we just ignore it, and don't set
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MIN_WHITESPACE to zero.
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Lines without any content should (ideally) have no white-space at
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all, but if they do then they might have an artificially low number
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(user left a single stray space at the start of an otherwise blank
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line), we don't consider lines without content when updating the
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MIN_WHITESPACE value. */
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gdb::optional<int> min_whitespace;
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/* The index into WS_INFO at which the processing of DOC can be
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considered "all done", that is, after this point there are no further
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lines with useful content and we should just stop. */
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gdb::optional<size_t> all_done_idx;
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/* White-space information for each line in DOC. */
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std::vector<line_whitespace> ws_info;
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/* Now look through DOC and collect the required information. */
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const char *tmp = doc.get ();
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while (*tmp != '\0')
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{
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/* Add an entry for the offset to the start of this line, and how
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much white-space there is at the start of this line. */
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size_t offset = tmp - doc.get ();
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int ws_count = count_whitespace (tmp);
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ws_info.emplace_back (offset, ws_count);
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/* Skip over the white-space. */
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tmp += ws_count;
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/* Remember where the content of this line starts, and skip forward
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to either the end of this line (newline) or the end of the DOC
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string (null character), whichever comes first. */
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const char *content_start = tmp;
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while (*tmp != '\0' && *tmp != '\n')
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++tmp;
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/* If this is not the first line, and if this line has some content,
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then update MIN_WHITESPACE, this reflects the smallest number of
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whitespace characters we can delete from all lines without
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impacting the relative indentation of all the lines of DOC. */
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if (offset > 0 && tmp > content_start)
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{
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if (!min_whitespace.has_value ())
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min_whitespace = ws_count;
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else
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min_whitespace = std::min (*min_whitespace, ws_count);
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}
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/* Each time we encounter a line that has some content we update
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ALL_DONE_IDX to be the index of the next line. If the last lines
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of DOC don't contain any content then ALL_DONE_IDX will be left
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pointing at an earlier line. When we rewrite DOC, when we reach
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ALL_DONE_IDX then we can stop, the allows us to trim any blank
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lines from the end of DOC. */
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||
if (tmp > content_start)
|
||
all_done_idx = ws_info.size ();
|
||
|
||
/* If we reached a newline then skip forward to the start of the next
|
||
line. The other possibility at this point is that we're at the
|
||
very end of the DOC string (null terminator). */
|
||
if (*tmp == '\n')
|
||
++tmp;
|
||
}
|
||
|
||
/* We found no lines with content, fail safe by just returning the
|
||
original documentation string. */
|
||
if (!all_done_idx.has_value () || !min_whitespace.has_value ())
|
||
return doc;
|
||
|
||
/* Setup DST and SRC, both pointing into the DOC string. We're going to
|
||
rewrite DOC in-place, as we only ever make DOC shorter (by removing
|
||
white-space), thus we know this will not overflow. */
|
||
char *dst = doc.get ();
|
||
char *src = doc.get ();
|
||
|
||
/* Array indices used with DST, SRC, and WS_INFO respectively. */
|
||
size_t dst_offset = 0;
|
||
size_t src_offset = 0;
|
||
size_t ws_info_offset = 0;
|
||
|
||
/* Now, walk over the source string, this is the original DOC. */
|
||
while (src[src_offset] != '\0')
|
||
{
|
||
/* If we are at the start of the next line (in WS_INFO), then we may
|
||
need to skip some white-space characters. */
|
||
if (src_offset == ws_info[ws_info_offset].offset ())
|
||
{
|
||
/* If a line has leading white-space then we need to skip over
|
||
some number of characters now. */
|
||
if (ws_info[ws_info_offset].ws () > 0)
|
||
{
|
||
/* If the line is entirely white-space then we skip all of
|
||
the white-space, the next character to copy will be the
|
||
newline or null character. Otherwise, we skip the just
|
||
some portion of the leading white-space. */
|
||
if (src[src_offset + ws_info[ws_info_offset].ws ()] == '\n'
|
||
|| src[src_offset + ws_info[ws_info_offset].ws ()] == '\0')
|
||
src_offset += ws_info[ws_info_offset].ws ();
|
||
else
|
||
src_offset += std::min (*min_whitespace,
|
||
ws_info[ws_info_offset].ws ());
|
||
|
||
/* If we skipped white-space, and are now at the end of the
|
||
input, then we're done. */
|
||
if (src[src_offset] == '\0')
|
||
break;
|
||
}
|
||
if (ws_info_offset < (ws_info.size () - 1))
|
||
++ws_info_offset;
|
||
if (ws_info_offset > *all_done_idx)
|
||
break;
|
||
}
|
||
|
||
/* Don't copy a newline to the start of the DST string, this would
|
||
result in a leading blank line. But in all other cases, copy the
|
||
next character into the destination string. */
|
||
if ((dst_offset > 0 || src[src_offset] != '\n'))
|
||
{
|
||
dst[dst_offset] = src[src_offset];
|
||
++dst_offset;
|
||
}
|
||
|
||
/* Move to the next source character. */
|
||
++src_offset;
|
||
}
|
||
|
||
/* Remove the trailing newline character(s), and ensure we have a null
|
||
terminator in place. */
|
||
while (dst_offset > 1 && dst[dst_offset - 1] == '\n')
|
||
--dst_offset;
|
||
dst[dst_offset] = '\0';
|
||
|
||
return doc;
|
||
}
|