circuitpython/tools/gdb-stack-size.py

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"""Source this file into gdb `source ../../tools/gdb-stack-size.py` then run
`stack-size` to print a backtrace with each frame size next to it."""
class StackSize(gdb.Command):
def __init__(self):
super(StackSize, self).__init__("stack-size", gdb.COMMAND_USER)
def invoke(self, arg, from_tty):
frame = gdb.newest_frame()
total_size = 0
while frame:
sp = frame.read_register("sp")
frame_up = frame.older()
if not frame_up:
break
f = frame.function()
l = frame.level()
if l < 10:
l = "#" + str(l) + " "
else:
l = "#" + str(l)
size = frame_up.read_register("sp") - sp
total_size += size
print(l, sp, frame.type(), f, " " * (40 - len(str(f))), size)
# print(dir(f))
# Tweak this if for more detail for a specific function.
if False and f.name == "mp_execute_bytecode":
b = frame.block()
prev_b = None
while not b.is_static:
print(" block", hex(b.start), hex(b.end), b.function)
for sym in b:
if not sym.needs_frame:
continue
v = sym.value(frame)
print(" ", sym.addr_class, v.address, sym.type.sizeof, sym, sym.type, v)
prev_b = b
b = b.superblock
if b.function == f:
break
b = prev_b
print("pc scan", hex(b.start), hex(b.end))
seen = set()
for pc in range(b.start, b.end, 2):
b = gdb.block_for_pc(pc)
r = (b.start, b.end)
if r in seen:
continue
seen.add(r)
print(" ", hex(pc), hex(b.start), hex(b.end), b.function)
for sym in b:
if not sym.needs_frame:
continue
# if sym.type.sizeof <= 4:
# continue
v = sym.value(frame)
print(" ", sym.addr_class, v.address, sym.type.sizeof, sym, sym.type, v)
frame = frame_up
print("total size:", total_size)
StackSize()