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