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Heap analysis tool (#529)

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* random heap stuff

* Fix dicts

* Less hand coding. Now reads .map file for memory locations of stuff.

* Display qstr chunk contents.
This commit is contained in:
Scott Shawcroft 2018-01-18 18:53:52 -08:00 committed by Dan Halbert
parent 44bc1711aa
commit d16af1fbb2
2 changed files with 644 additions and 0 deletions
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441
tools/analyze_heap_dump.py Normal file
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# This script renders a graph of the MicroPython heap at the given point it was dumped.
# It takes three files, the binary dump of ram, the binary for CircuitPython and the linker map file.
# To dump ram do this in GDB: dump binary memory ram.bin &_srelocate &_estack
import binascii
import struct
import sys
import pygraphviz as pgv
import io
import html
from analyze_mpy import Prelude
BITS_PER_BYTE = 8
BLOCKS_PER_ATB = 4
BLOCKS_PER_FTB = 8
BYTES_PER_BLOCK = 16
AT_FREE = 0
AT_HEAD = 1
AT_TAIL = 2
AT_MARK = 3
MICROPY_QSTR_BYTES_IN_HASH = 1
MICROPY_QSTR_BYTES_IN_LEN = 1
MP_OBJ_NULL = 0
MP_OBJ_SENTINEL = 4
READLINE_HIST_SIZE = 8
SKIP_SYMBOLS = [".debug_ranges", ".debug_frame", ".debug_loc", ".comment", ".debug_str", ".debug_line", ".debug_abbrev", ".debug_info", "COMMON"]
ownership_graph = pgv.AGraph(directed=True)
with open(sys.argv[1], "rb") as f:
ram = f.read()
with open(sys.argv[2], "rb") as f:
rom = f.read()
symbols = {} # name -> address, size
symbol_lookup = {} # address -> name
manual_symbol_map = {} # autoname -> name
def add_symbol(name, address=None, size=None):
global symbols
if address:
address = int(address, 0)
if size:
size = int(size, 0)
if name in symbols:
if address and symbols[name][0] and symbols[name][0] != address:
print("Conflicting symbol: {}".format(name))
return
if not address:
address = symbols[name][0]
if not size:
size = symbols[name][1]
symbols[name] = (address, size)
if address:
if not size:
size = 4
for offset in range(0, size, 4):
symbol_lookup[address + offset] = "{}+{}".format(name, offset)
with open(sys.argv[3], "r") as f:
common_symbols = False
name = None
for line in f:
line = line.strip()
parts = line.split()
if line.startswith("Common symbol"):
common_symbols = True
if line == "Discarded input sections":
common_symbols = False
if common_symbols:
if len(parts) == 1:
name = parts[0]
elif len(parts) == 2 and name:
add_symbol(name, size=parts[0])
name = None
elif len(parts) == 3:
add_symbol(parts[0], size=parts[1])
name = None
else:
if len(parts) == 2 and parts[0].startswith("0x") and not parts[1].startswith("0x"):
add_symbol(parts[1], parts[0])
if len(parts) == 4 and parts[0] not in SKIP_SYMBOLS and parts[1].startswith("0x") and parts[2].startswith("0x"):
name, address, size, source = parts
if name.startswith((".text", ".rodata", ".bss")) and name.count(".") > 1:
name = name.split(".")[-1]
add_symbol(name, address, size)
# Linker symbols
if len(parts) >= 4 and parts[0].startswith("0x") and parts[2] == "=" and parts[1] != ".":
add_symbol(parts[1], parts[0])
rom_start = symbols["_sfixed"][0]
ram_start = symbols["_srelocate"][0]
def load(address, size=4):
if size is None:
raise ValueError("You must provide a size")
if address > ram_start:
ram_address = address - ram_start
if (ram_address + size) > len(ram):
raise ValueError("Unable to read 0x{:08x} from ram.".format(address))
return ram[ram_address:ram_address+size]
elif address < len(rom):
if (address + size) > len(rom):
raise ValueError("Unable to read 0x{:08x} from rom.".format(address))
return rom[address:address+size]
def load_pointer(address):
return struct.unpack("<I", load(address))[0]
heap_start, heap_size = symbols["heap"]
heap = load(heap_start, heap_size)
total_byte_len = len(heap)
# These change every run so we load them from the symbol table
mp_state_ctx = symbols["mp_state_ctx"][0]
manual_symbol_map["mp_state_ctx+24"] = "mp_state_ctx.vm.last_pool"
last_pool = load_pointer(mp_state_ctx + 24) # (gdb) p &mp_state_ctx.vm.last_pool
manual_symbol_map["mp_state_ctx+92"] = "mp_state_ctx.vm.dict_main.map.table"
dict_main_table = load_pointer(mp_state_ctx + 92) # (gdb) p &mp_state_ctx.vm.dict_main.map.table
manual_symbol_map["mp_state_ctx+72"] = "mp_state_ctx.vm.mp_loaded_modules_dict.map.table"
imports_table = load_pointer(mp_state_ctx + 72) # (gdb) p &mp_state_ctx.vm.mp_loaded_modules_dict.map.table
manual_symbol_map["mp_state_ctx+108"] = "mp_state_ctx.vm.mp_sys_path_obj.items"
manual_symbol_map["mp_state_ctx+124"] = "mp_state_ctx.vm.mp_sys_argv_obj.items"
for i in range(READLINE_HIST_SIZE):
manual_symbol_map["mp_state_ctx+{}".format(128 + i * 4)] = "mp_state_ctx.vm.readline_hist[{}]".format(i)
tuple_type = symbols["mp_type_tuple"][0]
type_type = symbols["mp_type_type"][0]
map_type = symbols["mp_type_map"][0]
dict_type = symbols["mp_type_dict"][0]
property_type = symbols["mp_type_property"][0]
str_type = symbols["mp_type_str"][0]
function_types = [symbols["mp_type_fun_" + x][0] for x in ["bc", "builtin_0", "builtin_1", "builtin_2", "builtin_3", "builtin_var"]]
bytearray_type = symbols["mp_type_bytearray"][0]
dynamic_type = 0x40000000 # placeholder, doesn't match any memory
type_colors = {
dict_type: "red",
property_type: "yellow",
map_type: "blue",
type_type: "orange",
tuple_type: "skyblue",
str_type: "pink",
bytearray_type: "purple"
}
pool_shift = heap_start % BYTES_PER_BLOCK
print("Total heap length:", total_byte_len)
atb_length = total_byte_len * BITS_PER_BYTE // (BITS_PER_BYTE + BITS_PER_BYTE * BLOCKS_PER_ATB // BLOCKS_PER_FTB + BITS_PER_BYTE * BLOCKS_PER_ATB * BYTES_PER_BLOCK)
print("ATB length:", atb_length)
pool_length = atb_length * BLOCKS_PER_ATB * BYTES_PER_BLOCK
print("Total allocatable:", pool_length)
gc_finaliser_table_byte_len = (atb_length * BLOCKS_PER_ATB + BLOCKS_PER_FTB - 1) // BLOCKS_PER_FTB
print("FTB length:", gc_finaliser_table_byte_len)
pool_start = heap_start + total_byte_len - pool_length - pool_shift
pool = heap[-pool_length-pool_shift:]
map_element_blocks = [dict_main_table, imports_table]
string_blocks = []
bytecode_blocks = []
qstr_pools = []
qstr_chunks = []
block_data = {}
# Find all the qtr pool addresses.
prev_pool = last_pool
while prev_pool > ram_start:
qstr_pools.append(prev_pool)
prev_pool = load_pointer(prev_pool)
longest_free = 0
current_free = 0
current_allocation = 0
total_free = 0
for i in range(atb_length):
# Each atb byte is four blocks worth of info
atb = heap[i]
for j in range(4):
block_state = (atb >> (j * 2)) & 0x3
if block_state != AT_FREE and current_free > 0:
print("{} bytes free".format(current_free * BYTES_PER_BLOCK))
current_free = 0
if block_state != AT_TAIL and current_allocation > 0:
allocation_length = current_allocation * BYTES_PER_BLOCK
end = (i * BLOCKS_PER_ATB + j) * BYTES_PER_BLOCK
start = end - allocation_length
address = pool_start + start
data = pool[start:end]
print("0x{:x} {} bytes allocated".format(address, allocation_length))
rows = ""
for k in range(current_allocation - 1):
rows += "<tr>"
for l in range(4):
rows += "<td port=\"{}\" height=\"18\" width=\"20\"></td>".format(4 * (k + 1) + l)
rows += "</tr>"
table = "<<table bgcolor=\"gray\" border=\"1\" cellpadding=\"0\" cellspacing=\"0\"><tr><td colspan=\"4\" port=\"0\" height=\"18\" width=\"80\">0x{:08x}</td></tr>{}</table>>".format(address, rows)
ownership_graph.add_node(address, label=table, style="invisible", shape="plaintext")
potential_type = None
node = ownership_graph.get_node(address)
block_data[address] = data
for k in range(len(data) // 4):
word = struct.unpack_from("<I", data, offset=(k * 4))[0]
if word < 0x00040000 and k == 0 or address in qstr_pools:
potential_type = word
bgcolor = "gray"
if address in qstr_pools:
bgcolor = "tomato"
elif potential_type in function_types:
bgcolor = "green"
elif potential_type in type_colors:
bgcolor = type_colors[potential_type]
else:
pass
#print("unknown type", hex(potential_type))
node.attr["label"] = "<" + node.attr["label"].replace("\"gray\"", "\"" + bgcolor + "\"") + ">"
if potential_type == str_type and k == 3:
string_blocks.append(word)
if potential_type == dict_type:
if k == 3:
map_element_blocks.append(word)
if ram_start < word < (ram_start + len(ram)) and word % 16 == 0:
port = k
if k < 4:
port = 0
ownership_graph.add_edge(address, word, tailport=str(port)+":_")
#print(" 0x{:08x}".format(word))
if address in qstr_pools:
if k > 0:
qstr_chunks.append(word)
if k == 0:
potential_type = dynamic_type
if potential_type == dynamic_type:
if k == 0:
node.attr["fillcolor"] = "plum"
if k == 3 and 0x20000000 < word < 0x20040000:
map_element_blocks.append(word)
if potential_type in function_types:
if k == 2 and 0x20000000 < word < 0x20040000:
bytecode_blocks.append(word)
current_allocation = 0
if block_state == AT_FREE:
current_free += 1
total_free += 1
elif block_state == AT_HEAD:
current_allocation = 1
elif block_state == AT_TAIL:
current_allocation += 1
longest_free = max(longest_free, current_free)
if current_free > 0:
print("{} bytes free".format(current_free * BYTES_PER_BLOCK))
def is_qstr(obj):
return obj & 0xff800007 == 0x00000006
def find_qstr(qstr_index):
pool_ptr = last_pool
if not is_qstr(qstr_index):
return "object"
qstr_index >>= 3
while pool_ptr != 0:
#print(hex(pool_ptr))
if pool_ptr in block_data:
pool = block_data[pool_ptr]
prev, total_prev_len, alloc, length = struct.unpack_from("<IIII", pool)
else:
rom_offset = pool_ptr - rom_start
prev, total_prev_len, alloc, length = struct.unpack_from("<IIII", rom[rom_offset:rom_offset+32])
pool = rom[rom_offset:rom_offset+length*4]
#print("rom pool")
#print(hex(prev), total_prev_len, alloc, length)
#print(qstr_index, total_prev_len)
if qstr_index >= total_prev_len:
offset = (qstr_index - total_prev_len) * 4 + 16
start = struct.unpack_from("<I", pool, offset=offset)[0]
#print(hex(start))
if start < heap_start:
start -= rom_start
if start > len(rom):
return "more than rom: {:x}".format(start + rom_start)
qstr_hash, qstr_len = struct.unpack("<BB", rom[start:start+2])
return rom[start+2:start+2+qstr_len].decode("utf-8")
else:
if start > heap_start + len(heap):
return "out of range: {:x}".format(start)
local = start - heap_start
qstr_hash, qstr_len = struct.unpack("<BB", heap[local:local+2])
return heap[local+2:local+2+qstr_len].decode("utf-8")
pool_ptr = prev
return "unknown"
def format(obj):
if obj & 1 != 0:
return obj >> 1
if is_qstr(obj):
return find_qstr(obj)
else:
return "0x{:08x}".format(obj)
for block in sorted(map_element_blocks):
try:
node = ownership_graph.get_node(block)
except KeyError:
print("Unable to find memory block for 0x{:08x}. Is there something running?".format(block))
continue
#node.attr["fillcolor"] = "gold"
data = block_data[block]
#print("0x{:08x}".format(block))
cells = []
for i in range(len(data) // 8):
key, value = struct.unpack_from("<II", data, offset=(i * 8))
if key == MP_OBJ_NULL or key == MP_OBJ_SENTINEL:
#print(" <empty slot>")
cells.append(("", " "))
else:
#print(" {}, {}".format(format(key), format(value)))
cells.append((key, format(key)))
if value in block_data:
edge = ownership_graph.get_edge(block, value)
edge.attr["tailport"] = str(key)
rows = ""
for i in range(len(cells) // 2):
rows += "<tr><td port=\"{}\">{}</td><td port=\"{}\">{}</td></tr>".format(
cells[2*i][0],
cells[2*i][1],
cells[2*i+1][0],
cells[2*i+1][1])
node.attr["shape"] = "plaintext"
node.attr["style"] = "invisible"
node.attr["label"] = "<<table bgcolor=\"gold\" border=\"1\" cellpadding=\"0\" cellspacing=\"0\"><tr><td colspan=\"2\">0x{:08x}</td></tr>{}</table>>".format(block, rows)
for node, degree in ownership_graph.in_degree_iter():
if degree == 0:
address_bytes = struct.pack("<I", int(node))
location = -1
for _ in range(ram.count(address_bytes)):
location = ram.find(address_bytes, location + 1)
pointer_location = ram_start + location
source = "0x{:08x}".format(pointer_location)
if pointer_location in symbol_lookup:
source = symbol_lookup[pointer_location]
if source in manual_symbol_map:
source = manual_symbol_map[source]
if "readline_hist" in source:
string_blocks.append(int(node))
ownership_graph.add_edge(source, node)
for block in string_blocks:
node = ownership_graph.get_node(block)
node.attr["fillcolor"] = "hotpink"
string = block_data[block].decode('utf-8')
wrapped = []
for i in range(0, len(string), 16):
wrapped.append(string[i:i+16])
node.attr["label"] = "\n".join(wrapped)
node.attr["style"] = "filled"
node.attr["fontname"] = "FiraCode-Medium"
node.attr["fontpath"] = "/Users/tannewt/Library/Fonts/"
node.attr["fontsize"] = 8
for block in bytecode_blocks:
node = ownership_graph.get_node(block)
node.attr["fillcolor"] = "lightseagreen"
data = block_data[block]
prelude = Prelude(io.BufferedReader(io.BytesIO(data)))
node.attr["shape"] = "plaintext"
node.attr["style"] = "invisible"
code_info_size = prelude.code_info_size
rows = ""
remaining_bytecode = len(data) - 16
while code_info_size >= 16:
rows += "<tr><td colspan=\"16\" bgcolor=\"palegreen\" height=\"18\" width=\"80\"></td></tr>"
code_info_size -= 16
remaining_bytecode -= 16
if code_info_size > 0:
rows += ("<tr><td colspan=\"{}\" bgcolor=\"palegreen\" height=\"18\" width=\"{}\"></td>"
"<td colspan=\"{}\" bgcolor=\"seagreen\" height=\"18\" width=\"{}\"></td></tr>"
).format(code_info_size, code_info_size * (80 / 16), (16 - code_info_size), (80 / 16) * (16 - code_info_size))
remaining_bytecode -= 16
for i in range(remaining_bytecode // 16):
rows += "<tr><td colspan=\"16\" bgcolor=\"seagreen\" height=\"18\" width=\"80\"></td></tr>"
node.attr["label"] = "<<table border=\"1\" cellspacing=\"0\"><tr><td colspan=\"16\" bgcolor=\"lightseagreen\" height=\"18\" width=\"80\">0x{:08x}</td></tr>{}</table>>".format(block, rows)
for block in qstr_chunks:
if block not in block_data:
ownership_graph.delete_node(block)
continue
data = block_data[block]
string = ""
offset = 0
while offset < len(data) - 1:
qstr_hash, qstr_len = struct.unpack_from("<BB", data, offset=offset)
if qstr_hash == 0:
string += " " * (len(data) - offset)
offset = len(data)
continue
offset += 2 + qstr_len + 1
string += " " + data[offset - qstr_len - 1: offset - 1].decode("utf-8")
#print(string)
wrapped = []
for i in range(0, len(string), 16):
wrapped.append(html.escape(string[i:i+16]))
node = ownership_graph.get_node(block)
node.attr["label"] = "<<table border=\"1\" cellspacing=\"0\" bgcolor=\"lightsalmon\" width=\"80\"><tr><td height=\"18\" >0x{:08x}</td></tr><tr><td height=\"{}\" >{}</td></tr></table>>".format(block, 18 * (len(wrapped) - 1), "<br/>".join(wrapped))
node.attr["fontname"] = "FiraCode-Medium"
node.attr["fontpath"] = "/Users/tannewt/Library/Fonts/"
node.attr["fontsize"] = 8
print("Total free space:", BYTES_PER_BLOCK * total_free)
print("Longest free space:", BYTES_PER_BLOCK * longest_free)
with open("heap.dot", "w") as f:
f.write(ownership_graph.string())
ownership_graph.layout(prog="dot")
ownership_graph.draw("heap.png")

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import sys
import binascii
import io
bytecode_format_sizes = {
"MP_OPCODE_BYTE": 1,
"MP_OPCODE_QSTR": 3,
"MP_OPCODE_VAR_UINT": None, # Unknown because uint encoding uses the top bit to indicate the end.
"MP_OPCODE_OFFSET": 3,
"MP_OPCODE_BYTE_EXTRA": 2,
"MP_OPCODE_VAR_UINT_EXTRA": None,
"MP_OPCODE_OFFSET_EXTRA": 4
}
bytecodes = {
0x10: {"name": "MP_BC_LOAD_CONST_FALSE",
"format": "MP_OPCODE_BYTE"},
#define MP_BC_LOAD_CONST_NONE (0x11)
#define MP_BC_LOAD_CONST_TRUE (0x12)
#define MP_BC_LOAD_CONST_SMALL_INT (0x14) // signed var-int
#define MP_BC_LOAD_CONST_STRING (0x16) // qstr
#define MP_BC_LOAD_CONST_OBJ (0x17) // ptr
#define MP_BC_LOAD_NULL (0x18)
#define MP_BC_LOAD_FAST_N (0x19) // uint
#define MP_BC_LOAD_DEREF (0x1a) // uint
#define MP_BC_LOAD_NAME (0x1b) // qstr
#define MP_BC_LOAD_GLOBAL (0x1c) // qstr
#define MP_BC_LOAD_ATTR (0x1d) // qstr
#define MP_BC_LOAD_METHOD (0x1e) // qstr
#define MP_BC_LOAD_SUPER_METHOD (0x1f) // qstr
#define MP_BC_LOAD_BUILD_CLASS (0x20)
#define MP_BC_LOAD_SUBSCR (0x21)
#define MP_BC_STORE_FAST_N (0x22) // uint
#define MP_BC_STORE_DEREF (0x23) // uint
#define MP_BC_STORE_NAME (0x24) // qstr
#define MP_BC_STORE_GLOBAL (0x25) // qstr
#define MP_BC_STORE_ATTR (0x26) // qstr
#define MP_BC_STORE_SUBSCR (0x27)
#define MP_BC_DELETE_FAST (0x28) // uint
#define MP_BC_DELETE_DEREF (0x29) // uint
#define MP_BC_DELETE_NAME (0x2a) // qstr
#define MP_BC_DELETE_GLOBAL (0x2b) // qstr
#define MP_BC_DUP_TOP (0x30)
#define MP_BC_DUP_TOP_TWO (0x31)
#define MP_BC_POP_TOP (0x32)
#define MP_BC_ROT_TWO (0x33)
#define MP_BC_ROT_THREE (0x34)
#define MP_BC_JUMP (0x35) // rel byte code offset, 16-bit signed, in excess
#define MP_BC_POP_JUMP_IF_TRUE (0x36) // rel byte code offset, 16-bit signed, in excess
#define MP_BC_POP_JUMP_IF_FALSE (0x37) // rel byte code offset, 16-bit signed, in excess
#define MP_BC_JUMP_IF_TRUE_OR_POP (0x38) // rel byte code offset, 16-bit signed, in excess
#define MP_BC_JUMP_IF_FALSE_OR_POP (0x39) // rel byte code offset, 16-bit signed, in excess
#define MP_BC_SETUP_WITH (0x3d) // rel byte code offset, 16-bit unsigned
#define MP_BC_WITH_CLEANUP (0x3e)
#define MP_BC_SETUP_EXCEPT (0x3f) // rel byte code offset, 16-bit unsigned
#define MP_BC_SETUP_FINALLY (0x40) // rel byte code offset, 16-bit unsigned
#define MP_BC_END_FINALLY (0x41)
#define MP_BC_GET_ITER (0x42)
#define MP_BC_FOR_ITER (0x43) // rel byte code offset, 16-bit unsigned
#define MP_BC_POP_BLOCK (0x44)
#define MP_BC_POP_EXCEPT (0x45)
#define MP_BC_UNWIND_JUMP (0x46) // rel byte code offset, 16-bit signed, in excess; then a byte
#define MP_BC_GET_ITER_STACK (0x47)
#define MP_BC_BUILD_TUPLE (0x50) // uint
#define MP_BC_BUILD_LIST (0x51) // uint
#define MP_BC_BUILD_MAP (0x53) // uint
#define MP_BC_STORE_MAP (0x54)
#define MP_BC_BUILD_SET (0x56) // uint
#define MP_BC_BUILD_SLICE (0x58) // uint
#define MP_BC_STORE_COMP (0x57) // uint
#define MP_BC_UNPACK_SEQUENCE (0x59) // uint
#define MP_BC_UNPACK_EX (0x5a) // uint
#define MP_BC_RETURN_VALUE (0x5b)
#define MP_BC_RAISE_VARARGS (0x5c) // byte
#define MP_BC_YIELD_VALUE (0x5d)
#define MP_BC_YIELD_FROM (0x5e)
#define MP_BC_MAKE_FUNCTION (0x60) // uint
#define MP_BC_MAKE_FUNCTION_DEFARGS (0x61) // uint
#define MP_BC_MAKE_CLOSURE (0x62) // uint
#define MP_BC_MAKE_CLOSURE_DEFARGS (0x63) // uint
#define MP_BC_CALL_FUNCTION (0x64) // uint
#define MP_BC_CALL_FUNCTION_VAR_KW (0x65) // uint
#define MP_BC_CALL_METHOD (0x66) // uint
#define MP_BC_CALL_METHOD_VAR_KW (0x67) // uint
#define MP_BC_IMPORT_NAME (0x68) // qstr
#define MP_BC_IMPORT_FROM (0x69) // qstr
#define MP_BC_IMPORT_STAR (0x6a)
#define MP_BC_LOAD_CONST_SMALL_INT_MULTI (0x70) // + N(64)
#define MP_BC_LOAD_FAST_MULTI (0xb0) // + N(16)
#define MP_BC_STORE_FAST_MULTI (0xc0) // + N(16)
#define MP_BC_UNARY_OP_MULTI (0xd0) // + op(<MP_UNARY_OP_NUM_BYTECODE)
#define MP_BC_BINARY_OP_MULTI (0xd7) // + op(<MP_BINARY_OP_NUM_BYTECODE)
}
def read_uint(encoded_uint, peek=False):
unum = 0
i = 0
while True:
if peek:
b = encoded_uint.peek()[i]
else:
b = encoded_uint.read(1)[0]
unum = (unum << 7) | (b & 0x7f)
if (b & 0x80) == 0:
break
i += 1
return unum
class Prelude:
def __init__(self, encoded_prelude):
self.n_state = read_uint(encoded_prelude)
self.n_exc_stack = read_uint(encoded_prelude)
self.scope_flags = encoded_prelude.read(1)[0]
self.n_pos_args = encoded_prelude.read(1)[0]
self.n_kwonly_args = encoded_prelude.read(1)[0]
self.n_def_pos_args = encoded_prelude.read(1)[0]
self.code_info_size = read_uint(encoded_prelude, peek=True)
class RawCode:
# mp_raw_code_kind_t kind : 3;
# mp_uint_t scope_flags : 7;
# mp_uint_t n_pos_args : 11;
# union {
# struct {
# const byte *bytecode;
# const mp_uint_t *const_table;
# #if MICROPY_PERSISTENT_CODE_SAVE
# mp_uint_t bc_len;
# uint16_t n_obj;
# uint16_t n_raw_code;
# #endif
# } u_byte;
# struct {
# void *fun_data;
# const mp_uint_t *const_table;
# mp_uint_t type_sig; // for viper, compressed as 2-bit types; ret is MSB, then arg0, arg1, etc
# } u_native;
# } data;
def __init__(self, encoded_raw_code):
bc_len = read_uint(encoded_raw_code)
bc = encoded_raw_code.read(bc_len)
prelude = Prelude(io.BufferedReader(io.BytesIO(bc)))
encoded_code_info = bc[:prelude.code_info_size]
bc_start = prelude.code_info_size
while bc[bc_start] == 0xff:
bc_start += 1
bc = bc[bc_start:]
self.qstrs = []
self.simple_name = self._load_qstr(encoded_raw_code)
self.source_file = self._load_qstr(encoded_raw_code)
# the simple name and source file qstr indexes get written back into the byte code somehow
self._load_bytecode_qstrs(encoded_raw_code, bc)
print(self.qstrs[self.simple_name], self.qstrs[self.source_file])
print(binascii.hexlify(encoded_raw_code.peek(20)[:20]))
def _load_qstr(self, encoded_qstr):
string_len = read_uint(encoded_qstr)
string = encoded_qstr.read(string_len).decode("utf-8")
if string in self.qstrs:
return self.qstr.index(string)
new_index = len(self.qstrs)
self.qstrs.append(string)
return new_index
def _load_bytecode_qstrs(encoded_raw_code, bytecode):
i = 0
while i < len(bytecode):
opcode, opcode_size = mp_opcode_format(bytecode[i])
if opcode == MP_OPCODE_QSTR:
qstr_index = self._load_qstr(encoded_raw_code)
bytecode[i+1] = qstr_index
bytecode[i+2] = qstr_index >> 8
opcode += opcode_size
class mpyFile:
def __init__(self, encoded_mpy):
# this matches mp-raw_code_save in py/persistentcode.c
first_byte = encoded_mpy.read(1)
if first_byte != b'M':
raise ValueError("Not a valid first byte. Should be 'M' but is {}".format(first_byte))
self.version = encoded_mpy.read(1)[0]
self.feature_flags = encoded_mpy.read(1)[0]
self.small_int_bits = encoded_mpy.read(1)[0]
self.raw_code = RawCode(encoded_mpy)
if __name__ == "__main__":
with open(sys.argv[1], "rb") as f:
mpy = mpyFile(f)
print(mpy.version)
print(mpy.feature_flags)
print(mpy.small_int_bits)