def invoke(self, args, from_tty):
argv = parse_argv(args)
if len(argv) > 1:
print('Usage: walkstk [fp]')
return
# Bail early if the custom unwinder has not been set up.
if not unwind.try_unwinder_init():
print('walkstk: Could not initialize the HHVM unwinder.')
# Find the starting native frame.
native_frame = gdb.newest_frame()
if native_frame is None:
print('walkstk: Cannot find any frames: corrupt stack?')
return
# Set fp = $rbp, rip = $rip.
fp_type = T('uintptr_t').pointer()
fp = native_frame.read_register('rbp').cast(fp_type)
rip = native_frame.pc()
if len(argv) == 1:
# Start walking the stack from the user-provided `fp'.
fp = argv[0].cast(fp_type)[0]
rip = argv[0].cast(fp_type)[1]
# Try to find a corresponding native frame.
while (native_frame is not None and rip != native_frame.pc()):
native_frame = native_frame.older()
i = 0
# Make a fake frame for our `fp' and `rip'. This lets us pop a frame
# at the top of the loop, which makes it easier to include the final
# frame.
fp = (fp, rip)
while fp:
rip = fp[1]
fp = fp[0].cast(fp_type)
# Try to get the PHP function name from the ActRec at `fp' if we're
# executing in the TC.
if frame.is_jitted(fp, rip):
ar_type = T('HPHP::ActRec').pointer()
try:
print(
frame.stringify(
frame.create_php(idx=i,
ar=fp.cast(ar_type),
rip=rip)))
except gdb.MemoryError:
print(
frame.stringify(
frame.create_native(idx=i,
fp=fp,
rip=rip,
native_frame=native_frame)))
if native_frame is not None:
native_frame = native_frame.older()
i += 1
else:
if native_frame is None:
# If we couldn't find a native frame, then `walkstk' was
# invoked with a non-native `fp' argument. Now that we
# don't seem to be in the TC, try to find the corresponding
# native frame.
native_frame = gdb.newest_frame()
while (native_frame is not None
and rip != native_frame.pc()):
native_frame = native_frame.older()
if native_frame is not None:
# Pop native frames until we hit our caller's rip.
frames = []
while (native_frame is not None
and (fp == 0x0 or fp[1] != native_frame.pc())):
frames.append(
frame.create_native(idx=i,
fp='{inline frame}',
rip=native_frame.pc(),
native_frame=native_frame))
native_frame = native_frame.older()
i += 1
if frames:
# Associate the frame pointer with the un-inlined frame.
frames[-1]['fp'] = str(fp)
for f in frames:
print(frame.stringify(f))
else:
# We only hit this case if gdb undercounted the TC's
# frames---which shouldn't happen unless the custom
# unwinder (or gdb's unwinder API) is malfunctioning.
#
# Just guess that the name of the frame is the same as the
# name of the block we're in.
try:
block = gdb.block_for_pc(int(rip))
name = block.function.name
print(
frame.stringify(
frame.create_native(idx=i,
fp=fp,
rip=rip,
name='? ' + name)))
except:
print(
frame.stringify(
frame.create_native(idx=i,
fp=fp,
rip=rip,
native_frame=None)))
i += 1
def invoke(self, args, from_tty):
argv = parse_argv(args)
if len(argv) > 1:
print('Usage: walkstk [fp]')
return
# Bail early if the custom unwinder has not been set up.
if not unwind.try_unwinder_init():
print('walkstk: Could not initialize the HHVM unwinder.')
# Find the starting native frame.
native_frame = gdb.newest_frame()
if native_frame is None:
print('walkstk: Cannot find any frames: corrupt stack?')
return
# Set fp = $rbp, rip = $rip.
fp_type = T('uintptr_t').pointer()
fp = native_frame.read_register('rbp').cast(fp_type)
rip = native_frame.pc()
if len(argv) == 1:
# Start walking the stack from the user-provided `fp'.
fp = argv[0].cast(fp_type)[0]
rip = argv[0].cast(fp_type)[1]
# Try to find a corresponding native frame.
while (native_frame is not None
and rip != native_frame.pc()):
native_frame = native_frame.older()
i = 0
# Make a fake frame for our `fp' and `rip'. This lets us pop a frame
# at the top of the loop, which makes it easier to include the final
# frame.
fp = (fp, rip)
while fp:
rip = fp[1]
fp = fp[0].cast(fp_type)
# Try to get the PHP function name from the ActRec at `fp' if we're
# executing in the TC.
if frame.is_jitted(fp, rip):
ar_type = T('HPHP::ActRec').pointer()
try:
print(frame.stringify(frame.create_php(
idx=i, ar=fp.cast(ar_type), rip=rip)))
except gdb.MemoryError:
print(frame.stringify(frame.create_native(
idx=i, fp=fp, rip=rip, native_frame=native_frame)))
if native_frame is not None:
native_frame = native_frame.older()
i += 1
else:
if native_frame is None:
# If we couldn't find a native frame, then `walkstk' was
# invoked with a non-native `fp' argument. Now that we
# don't seem to be in the TC, try to find the corresponding
# native frame.
native_frame = gdb.newest_frame()
while (native_frame is not None
and rip != native_frame.pc()):
native_frame = native_frame.older()
if native_frame is not None:
# Pop native frames until we hit our caller's rip.
frames = []
while (native_frame is not None
and (fp == 0x0 or fp[1] != native_frame.pc())):
frames.append(frame.create_native(
idx=i,
fp='{inline frame}',
rip=native_frame.pc(),
native_frame=native_frame))
native_frame = native_frame.older()
i += 1
if frames:
# Associate the frame pointer with the un-inlined frame.
frames[-1]['fp'] = str(fp)
for f in frames:
print(frame.stringify(f))
else:
# We only hit this case if gdb undercounted the TC's
# frames---which shouldn't happen unless the custom
# unwinder (or gdb's unwinder API) is malfunctioning.
#
# Just guess that the name of the frame is the same as the
# name of the block we're in.
try:
print(frame.stringify(frame.create_native(
idx=i, fp=fp, rip=rip, name=_function_for(rip))))
except:
print(frame.stringify(frame.create_native(
idx=i, fp=fp, rip=rip, native_frame=None)))
i += 1