circuitpython/tools/stack-loc-to-pc.py

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"""Prints the pcs that access each stack location in a function. Useful for finding
infrequently used stack space.
Pipe in disassembly like so:
arm-none-eabi-objdump --disassemble=mp_execute_bytecode build-metro_m0_express/firmware.elf | python ../../tools/stack-loc-to-pc.py
"""
import sys
import re
offset = re.compile(r"sp, #(\d+)")
offsets = {}
for line in sys.stdin:
if "sp" in line:
m = offset.search(line)
o = int(m.groups()[0])
pc = line.split(":")[0]
if o not in offsets:
offsets[o] = []
offsets[o].append(pc.strip())
print("Offset", "Size", "PCs", sep="\t")
last_o = 0
for o in sorted(offsets):
print(o, o - last_o, offsets[o], sep="\t")
last_o = o