def set_fiber(cls, fiber):
cls.init()
if not fiber:
if not cls.instance.fiber:
return "No active fiber."
# get the relevant fiber's info, new one if specified, old one if not
info = FiberInfo(fiber or cls.instance.fiber)
if fiber:
if not FiberPrinter(fiber).backtrace_available():
return "Can not activate a non-waiting fiber."
# set the unwinder to do the right thing
cls.instance.fiber_context_ptr = fiber["fiberImpl_"][
"fiberContext_"]
else:
# disable the unwinder
cls.instance.fiber_context_ptr = None
# track the active fiber (or lack thereof)
cls.instance.fiber = fiber
# Clear frame cache to make sure we actually use the right unwinder
gdb.invalidate_cached_frames()
return "[{action} fiber {id} ({info})]".format(
action="Switching to" if fiber else "Deactivating",
id=info.id,
info=info)
def fiber_activate(fiber):
fiber_type = gdb.lookup_type("folly::fibers::Fiber")
if fiber.type != fiber_type:
fiber = fiber.cast(fiber_type.pointer()).dereference()
if not FiberPrinter(fiber).backtrace_available():
return "Can not activate a non-waiting fiber."
gdb.invalidate_cached_frames()
FiberUnwinder.set_fiber(fiber)
return "Fiber 0x{:12x} activated. You can call 'bt' now.".format(int(fiber.address))
def do_enable_unwinder(arg, flag):
"""Enable/disable unwinder(s)."""
(locus_re, name_re) = parse_unwinder_command_args(arg)
total = 0
if locus_re.match("global"):
total += do_enable_unwinder1(gdb.frame_unwinders, name_re, flag)
if locus_re.match("progspace"):
total += do_enable_unwinder1(gdb.current_progspace().frame_unwinders,
name_re, flag)
for objfile in gdb.objfiles():
if locus_re.match(objfile.filename):
total += do_enable_unwinder1(objfile.frame_unwinders, name_re,
flag)
if total > 0:
gdb.invalidate_cached_frames()
print("%d unwinder%s %s" % (total, "" if total == 1 else "s",
"enabled" if flag else "disabled"))
def do_enable_unwinder(arg, flag):
"""Enable/disable unwinder(s)."""
(locus_re, name_re) = parse_unwinder_command_args(arg)
total = 0
if locus_re.match("global"):
total += do_enable_unwinder1(gdb.frame_unwinders, name_re, flag)
if locus_re.match("progspace"):
total += do_enable_unwinder1(gdb.current_progspace().frame_unwinders,
name_re, flag)
for objfile in gdb.objfiles():
if locus_re.match(objfile.filename):
total += do_enable_unwinder1(objfile.frame_unwinders, name_re,
flag)
if total > 0:
gdb.invalidate_cached_frames()
print("%d unwinder%s %s" % (total, "" if total == 1 else "s",
"enabled" if flag else "disabled"))
def register_unwinder(locus, unwinder, replace=False):
"""Register unwinder in given locus.
The unwinder is prepended to the locus's unwinders list. Unwinder
name should be unique.
Arguments:
locus: Either an objfile, progspace, or None (in which case
the unwinder is registered globally).
unwinder: An object of a gdb.Unwinder subclass
replace: If True, replaces existing unwinder with the same name.
Otherwise, raises exception if unwinder with the same
name already exists.
Returns:
Nothing.
Raises:
RuntimeError: Unwinder name is not unique
TypeError: Bad locus type
"""
if locus is None:
if gdb.parameter("verbose"):
gdb.write("Registering global %s unwinder ...\n" % unwinder.name)
locus = gdb
elif isinstance(locus, gdb.Objfile) or isinstance(locus, gdb.Progspace):
if gdb.parameter("verbose"):
gdb.write("Registering %s unwinder for %s ...\n" %
(unwinder.name, locus.filename))
else:
raise TypeError("locus should be gdb.Objfile or gdb.Progspace or None")
i = 0
for needle in locus.frame_unwinders:
if needle.name == unwinder.name:
if replace:
del locus.frame_unwinders[i]
else:
raise RuntimeError("Unwinder %s already exists." %
unwinder.name)
i += 1
locus.frame_unwinders.insert(0, unwinder)
gdb.invalidate_cached_frames()
def register_unwinder(locus, unwinder, replace=False):
"""Register unwinder in given locus.
The unwinder is prepended to the locus's unwinders list. Unwinder
name should be unique.
Arguments:
locus: Either an objfile, progspace, or None (in which case
the unwinder is registered globally).
unwinder: An object of a gdb.Unwinder subclass
replace: If True, replaces existing unwinder with the same name.
Otherwise, raises exception if unwinder with the same
name already exists.
Returns:
Nothing.
Raises:
RuntimeError: Unwinder name is not unique
TypeError: Bad locus type
"""
if locus is None:
if gdb.parameter("verbose"):
gdb.write("Registering global %s unwinder ...\n" % unwinder.name)
locus = gdb
elif isinstance(locus, gdb.Objfile) or isinstance(locus, gdb.Progspace):
if gdb.parameter("verbose"):
gdb.write("Registering %s unwinder for %s ...\n" %
(unwinder.name, locus.filename))
else:
raise TypeError("locus should be gdb.Objfile or gdb.Progspace or None")
i = 0
for needle in locus.frame_unwinders:
if needle.name == unwinder.name:
if replace:
del locus.frame_unwinders[i]
else:
raise RuntimeError("Unwinder %s already exists." %
unwinder.name)
i += 1
locus.frame_unwinders.insert(0, unwinder)
gdb.invalidate_cached_frames()
def fiber_deactivate():
FiberUnwinderFrameFilter.set_skip_frame_sp(None)
gdb.invalidate_cached_frames()
return "Fiber de-activated."
