def __init__(self, args, first, _):
cmd_parts = self.parse_args(args, [2, 3] if first else [1, 2], ';')
self.arch = gdb.current_arch()
if first:
self.start_address = eval_int(cmd_parts.pop(0))
end = cmd_parts.pop(0)
self.end_address = None if end == 'NULL' else eval_int(end)
self.count = eval_int(cmd_parts.pop(0)) if cmd_parts else None
def update_exact(self, direction, addr):
'''Add or remove a function from tracing that starts at a given memory
address instead of whose name matches a regular expression.'''
func_name, offset = func_and_offset(int(addr, base=0))
# Checks we don't give an invalid address to remove_addr_trace(), or
# add_tracer().
if func_name is None or offset != 0:
raise ValueError('{} does not start a function'.format(addr))
if direction == '+':
arch = gdb.current_arch()
return add_tracer(helpers.FakeSymbol(func_name, addr), arch)
remove_addr_trace(int(addr, 0))
def __init__(self, maxdepth, file_regexp, start_expr, unique_funcs):
self.func_stack = []
self.arch = gdb.current_arch()
self.maxdepth = maxdepth
self.file_regexp = file_regexp
# User asked for specific files, we only know the filename if there is
# debugging information, hence ignore all functions that don't have
# debugging info.
self.dont_fallback = re.match(self.file_regexp, '') is not None
self.unique_funcs = unique_funcs
self.all_seen = set()
# hypothetical_stack checks for recursion, but also allows the
# hypothetical-call-stack walker to see what the current stack is.
type(self).hypothetical_stack = []
self.start_expr = start_expr
def __init__(self, args, first, _):
self.cmd_parts = self.parse_args(args, [3,3] if first else [2,2], ';')
self.maxdepth = eval_int(self.cmd_parts[-1])
self.file_regex = self.cmd_parts[-2].strip()
# User asked for specific files, wo only know the filename if there is
# debugging information, hence ignore all functions that don't have
# debugging info.
self.dont_fallback = re.match(self.file_regex, '') is not None
self.func_stack = []
# hypothetical_stack checks for recursion, but also allows the
# hypothetical-call-stack walker to see what the current stack is.
type(self).hypothetical_stack = []
if first:
self.__add_addr(eval_int(self.cmd_parts[0]), 0)
self.arch = gdb.current_arch()
def trace_regexp(regexp):
'Trace all functions matching `regexp` in the current symbol table.'
file_regex, func_regex = file_func_split(regexp)
if file_regex is None:
file_regex = '.*' if gdb.parameter('call-graph-nondebug') else '.+'
arch = gdb.current_arch()
# We have to break on address to distinguish symbols with the same name in
# different files.
#
# In order to have nice output, we create a string that describes the
# function for a human -- though symbols with the same name will have the
# same output for entry tracepoints.
for symbol in gdb.search_symbols(func_regex, file_regex,
gdb.parameter('call-graph-dynlibs')):
add_tracer(symbol, arch)
def __init__(self, start_expr, end_expr, count_expr):
self.arch = gdb.current_arch()
self.start_expr = start_expr
self.end_expr = end_expr
self.count_expr = count_expr
def function_disassembly(func_addr, arch=None, use_fallback=True):
'''Return the disassembly and filename of the function at `func_addr`.
If there are no debugging symbols, return the None as the filename.
(function_disassembly, function_name or None, function_filename or None)
If we have debugging information, but we can't find a function at the
address specified, we return '' for the function_name and
function_filename.
If `use_fallback` is set to False, and there is are no debugging symbols
for the current function, return (None, None, None).
'''
arch = arch or gdb.current_arch()
try:
func_block = gdb.block_for_pc(func_addr)
# Bit of a hack, but I want the same thing to happen when gdb can't
# find the object file (and hence raises an exception itself) as when
# it just can't find the block.
if func_block is None:
raise RuntimeError('Cannot locate object file for block.')
except RuntimeError as e:
if e.args != ('Cannot locate object file for block.', ):
raise e
else:
orig_block = func_block
# This has happened a few times -- find out why/when.
# When the file was compiled without debugging.
if func_block is None:
print(func_addr)
# Often enough that it's a problem, despite being given the start of a
# function as the address, we get a child block of the function.
# Functions I've seen this happen with (all when inspecting a debug
# build of neovim).
#
# src/valgrind.c je_valgrind_make_mem_undefined
# src/valgrind.c je_valgrind_make_mem_defined
# include/jemalloc/internal/atomic.h je_atomic_add_uint32
#
# I used the below to get this output.
# if not func_block.function:
# print(func_addr)
# above = func_block.superblock.function
# if above:
# print(above.symtab.filename, above.name)
while func_block and func_block.function is None:
func_block = func_block.superblock
if func_block:
function_name = func_block.function.name
function_filename = func_block.function.symtab.filename
else:
# Print this out for my information -- I don't know of a case when
# this would happen, so if it does I have a chance to learn.
print('Function not found at {}'.format(func_addr))
func_block = orig_block
function_name = ''
function_filename = ''
# No instruction is less than one byte.
# If we provide an end point that is one byte less than the end of the
# last instruction in the block, then this ends the disassembly on the
# last instruction of the function.
return (arch.disassemble(func_block.start, func_block.end-1),
function_name,
function_filename)
if not use_fallback:
return (None, None, None)
# Fallback -- Use the gdb `disassemble` command to disassemble the entire
# function, and find difference between the start and end of that function.
# Rather than implementing a conversion function between a line in the
# output of the `disassemble` command and a dictionary that matches the
# output of the Architecture.disassemble() method, we just find the extent
# of the current function with `disassemble {}`, and then return the list
# made from Architecture.disassemble() directly.
output = gdb.execute('disassemble {}'.format(func_addr), False, True)
lines = output.splitlines()
if not lines[0].startswith('Dump of assembler code for function'):
raise RuntimeError('Failed to find function at {}'.format(func_addr))
# Avoid the 'End of assembler dump.' line that is actually last.
start_addr = int(lines[1].split()[0], base=16)
last_pos = int(lines[-2].split()[0], base=16)
function_name = re.search('Dump of assembler code for function (\S+):',
lines[0])
function_name = function_name.groups()[0] if function_name else None
return arch.disassemble(start_addr, last_pos), function_name, None
