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Attempt to fix crashes under GDB on Windows 10

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* src/pdumper.c (dump_discard_mem)
[VM_SUPPORTED == VM_MS_WINDOWS]: Don't pass NULL pointer as
last argument to VirtualProtect.  Reported by Martin Rudalics
<rudalics@gmx.at>.
This commit is contained in:
Eli Zaretskii 2019-03-27 20:34:22 +02:00
parent a697d1e638
commit a35a1f6a94
2 changed files with 51 additions and 39 deletions
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87
src/coding.c
View file

@ -7798,42 +7798,6 @@ static Lisp_Object Vcode_conversion_reused_workbuf;
static bool reused_workbuf_in_use;
/* Return a working buffer of code conversion. MULTIBYTE specifies the
multibyteness of returning buffer. */
static Lisp_Object
make_conversion_work_buffer (bool multibyte)
{
Lisp_Object name, workbuf;
struct buffer *current;
if (reused_workbuf_in_use)
{
name = Fgenerate_new_buffer_name (Vcode_conversion_workbuf_name, Qnil);
workbuf = Fget_buffer_create (name);
}
else
{
reused_workbuf_in_use = 1;
if (NILP (Fbuffer_live_p (Vcode_conversion_reused_workbuf)))
Vcode_conversion_reused_workbuf
= Fget_buffer_create (Vcode_conversion_workbuf_name);
workbuf = Vcode_conversion_reused_workbuf;
}
current = current_buffer;
set_buffer_internal (XBUFFER (workbuf));
/* We can't allow modification hooks to run in the work buffer. For
instance, directory_files_internal assumes that file decoding
doesn't compile new regexps. */
Fset (Fmake_local_variable (Qinhibit_modification_hooks), Qt);
Ferase_buffer ();
bset_undo_list (current_buffer, Qt);
bset_enable_multibyte_characters (current_buffer, multibyte ? Qt : Qnil);
set_buffer_internal (current);
return workbuf;
}
static void
code_conversion_restore (Lisp_Object arg)
{
@ -7846,7 +7810,12 @@ code_conversion_restore (Lisp_Object arg)
if (EQ (workbuf, Vcode_conversion_reused_workbuf))
reused_workbuf_in_use = 0;
else
Fkill_buffer (workbuf);
{
ptrdiff_t count = SPECPDL_INDEX ();
specbind (Qbuffer_list_update_hook, Qnil);
Fkill_buffer (workbuf);
unbind_to (count, Qnil);
}
}
set_buffer_internal (XBUFFER (current));
}
@ -7857,9 +7826,51 @@ code_conversion_save (bool with_work_buf, bool multibyte)
Lisp_Object workbuf = Qnil;
if (with_work_buf)
workbuf = make_conversion_work_buffer (multibyte);
{
ptrdiff_t count = SPECPDL_INDEX ();
if (reused_workbuf_in_use)
{
Lisp_Object name
= Fgenerate_new_buffer_name (Vcode_conversion_workbuf_name, Qnil);
specbind (Qbuffer_list_update_hook, Qnil);
workbuf = Fget_buffer_create (name);
unbind_to (count, Qnil);
}
else
{
if (NILP (Fbuffer_live_p (Vcode_conversion_reused_workbuf)))
{
specbind (Qbuffer_list_update_hook, Qnil);
Vcode_conversion_reused_workbuf
= Fget_buffer_create (Vcode_conversion_workbuf_name);
unbind_to (count, Qnil);
}
workbuf = Vcode_conversion_reused_workbuf;
}
}
record_unwind_protect (code_conversion_restore,
Fcons (Fcurrent_buffer (), workbuf));
if (!NILP (workbuf))
{
struct buffer *current = current_buffer;
set_buffer_internal (XBUFFER (workbuf));
/* We can't allow modification hooks to run in the work buffer. For
instance, directory_files_internal assumes that file decoding
doesn't compile new regexps. */
Fset (Fmake_local_variable (Qinhibit_modification_hooks), Qt);
Ferase_buffer ();
bset_undo_list (current_buffer, Qt);
bset_enable_multibyte_characters (current_buffer, multibyte ? Qt : Qnil);
if (EQ (workbuf, Vcode_conversion_reused_workbuf))
reused_workbuf_in_use = 1;
else
{
Fset (Fmake_local_variable (Qkill_buffer_query_functions), Qnil);
Fset (Fmake_local_variable (Qkill_buffer_hook), Qnil);
}
set_buffer_internal (current);
}
return workbuf;
}

3
src/pdumper.c
View file

@ -4623,7 +4623,8 @@ dump_discard_mem (void *mem, size_t size)
/* Discard COWed pages. */
(void) VirtualFree (mem, size, MEM_DECOMMIT);
/* Release the commit charge for the mapping. */
(void) VirtualProtect (mem, size, PAGE_NOACCESS, NULL);
DWORD old_prot;
(void) VirtualProtect (mem, size, PAGE_NOACCESS, &old_prot);
#elif VM_SUPPORTED == VM_POSIX
# ifdef HAVE_POSIX_MADVISE
/* Discard COWed pages. */