Add new information gathering to the lldb & simple backtrace methods:

print five words of memory at the beginning of the stack frame so it's
easier to track where an incorrect saved-fp or saved-pc may have come from.

llvm-svn: 185903
This commit is contained in:
Jason Molenda 2013-07-09 05:08:14 +00:00
parent cf68e2a1b1
commit 5bd4a4613c
1 changed files with 30 additions and 5 deletions

View File

@ -72,7 +72,7 @@ def simple_backtrace(debugger):
if this_module != None:
module_list.append (this_module)
if cur_thread.GetNumFrames() < 2:
return
return [module_list, address_list]
cur_fp = process.ReadPointerFromMemory (initial_fp, lldb.SBError())
cur_pc = process.ReadPointerFromMemory (initial_fp + process.GetAddressByteSize(), lldb.SBError())
@ -82,6 +82,8 @@ def simple_backtrace(debugger):
while cur_pc != 0 and cur_fp != 0 and cur_pc != lldb.LLDB_INVALID_ADDRESS and cur_fp != lldb.LLDB_INVALID_ADDRESS:
address_list.append (cur_pc)
this_module = backtrace_print_frame (target, frame_num, cur_pc, cur_fp)
print_stack_frame (process, cur_fp)
print ""
if this_module != None:
module_list.append (this_module)
frame_num = frame_num + 1
@ -101,10 +103,29 @@ def simple_backtrace(debugger):
cur_pc = next_pc
cur_fp = next_fp
this_module = backtrace_print_frame (target, frame_num, cur_pc, cur_fp)
print_stack_frame (process, cur_fp)
print ""
if this_module != None:
module_list.append (this_module)
return [module_list, address_list]
def print_stack_frame(process, fp):
if fp == 0 or fp == lldb.LLDB_INVALID_ADDRESS or fp == 1:
return
addr_size = process.GetAddressByteSize()
addr = fp - (2 * addr_size)
i = 0
outline = "Stack frame from $fp-%d: " % (2 * addr_size)
error = lldb.SBError()
try:
while i < 5 and error.Success():
address = process.ReadPointerFromMemory(addr + (i * addr_size), error)
outline += " 0x%x" % address
i += 1
print outline
except Exception:
return
def diagnose_unwind(debugger, command, result, dict):
"""
Gather diagnostic information to help debug incorrect unwind (backtrace)
@ -157,6 +178,8 @@ to be helpful when reporting the problem.
for frame in thread.frames:
if not frame.IsInlined():
this_module = backtrace_print_frame (target, frame_num, frame.GetPC(), frame.GetFP())
print_stack_frame (process, frame.GetFP())
print ""
if this_module != None:
modules_seen.append (this_module)
addresses_seen.append (frame.GetPC())
@ -166,10 +189,12 @@ to be helpful when reporting the problem.
print ""
print "Simple stack walk algorithm:"
print ""
simple_bt_modules_and_addresses = simple_backtrace(debugger)
modules_seen += simple_bt_modules_and_addresses[0]
addresses_seen = set(addresses_seen)
addresses_seen.update(set(simple_bt_modules_and_addresses[1]))
(module_list, address_list) = simple_backtrace(debugger)
if module_list and module_list != None:
modules_seen += module_list
if address_list and address_list != None:
addresses_seen = set(addresses_seen)
addresses_seen.update(set(address_list))
print ""
print "============================================================================================="