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Mostly recover a Ruby stack trace from a core file
Update the lldb script so it can mostly recover a Ruby stack trace from a core file. It's still missing line numbers and dealing with CFUNCs, but you use it like this: ``` (lldb) rbbt ec rb_control_frame_t TYPE 0x7f6fd6555fa0 EVAL ./bootstraptest/runner.rb error!! 0x7f6fd6555f68 METHOD ./bootstraptest/runner.rb main 0x7f6fd6555f30 METHOD ./bootstraptest/runner.rb in_temporary_working_directory 0x7f6fd6555ef8 METHOD /home/aaron/git/ruby/lib/tmpdir.rb mktmpdir 0x7f6fd6555ec0 BLOCK ./bootstraptest/runner.rb block in in_temporary_working_directory 0x7f6fd6555e88 CFUNC 0x7f6fd6555e50 BLOCK ./bootstraptest/runner.rb block (2 levels) in in_temporary_working_directory 0x7f6fd6555e18 BLOCK ./bootstraptest/runner.rb block in main 0x7f6fd6555de0 METHOD ./bootstraptest/runner.rb exec_test 0x7f6fd6555da8 CFUNC 0x7f6fd6555d70 BLOCK ./bootstraptest/runner.rb block in exec_test 0x7f6fd6555d38 CFUNC 0x7f6fd6555d00 TOP /home/aaron/git/ruby/bootstraptest/test_insns.rb error!! 0x7f6fd6555cc8 CFUNC 0x7f6fd6555c90 BLOCK /home/aaron/git/ruby/bootstraptest/test_insns.rb block in <top (required)> 0x7f6fd6555c58 METHOD ./bootstraptest/runner.rb assert_equal 0x7f6fd6555c20 METHOD ./bootstraptest/runner.rb assert_check 0x7f6fd6555be8 METHOD ./bootstraptest/runner.rb show_progress 0x7f6fd6555bb0 METHOD ./bootstraptest/runner.rb with_stderr 0x7f6fd6555b78 BLOCK ./bootstraptest/runner.rb block in show_progress 0x7f6fd6555b40 BLOCK ./bootstraptest/runner.rb block in assert_check 0x7f6fd6555b08 METHOD ./bootstraptest/runner.rb get_result_string 0x7f6fd6555ad0 METHOD ./bootstraptest/runner.rb make_srcfile 0x7f6fd6555a98 CFUNC 0x7f6fd6555a60 BLOCK ./bootstraptest/runner.rb block in make_srcfile ``` Getting the main execution context is difficult (it is stored in a thread local) so for now you must supply an ec and this will make a backtrace
This commit is contained in:
Aaron Patterson
parent
2e8b5968e1
commit
8a06af5f88
1 changed files with 163 additions and 0 deletions
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@ -14,6 +14,149 @@ import shlex
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HEAP_PAGE_ALIGN_LOG = 14
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HEAP_PAGE_ALIGN_MASK = (~(~0 << HEAP_PAGE_ALIGN_LOG))
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class BackTrace:
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VM_FRAME_MAGIC_METHOD = 0x11110001
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VM_FRAME_MAGIC_BLOCK = 0x22220001
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VM_FRAME_MAGIC_CLASS = 0x33330001
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VM_FRAME_MAGIC_TOP = 0x44440001
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VM_FRAME_MAGIC_CFUNC = 0x55550001
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VM_FRAME_MAGIC_IFUNC = 0x66660001
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VM_FRAME_MAGIC_EVAL = 0x77770001
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VM_FRAME_MAGIC_RESCUE = 0x78880001
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VM_FRAME_MAGIC_DUMMY = 0x79990001
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VM_FRAME_MAGIC_MASK = 0x7fff0001
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VM_FRAME_MAGIC_NAME = {
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VM_FRAME_MAGIC_TOP: "TOP",
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VM_FRAME_MAGIC_METHOD: "METHOD",
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VM_FRAME_MAGIC_CLASS: "CLASS",
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VM_FRAME_MAGIC_BLOCK: "BLOCK",
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VM_FRAME_MAGIC_CFUNC: "CFUNC",
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VM_FRAME_MAGIC_IFUNC: "IFUNC",
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VM_FRAME_MAGIC_EVAL: "EVAL",
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VM_FRAME_MAGIC_RESCUE: "RESCUE",
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0: "-----"
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}
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def __init__(self, debugger, command, result, internal_dict):
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self.debugger = debugger
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self.command = command
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self.result = result
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self.target = debugger.GetSelectedTarget()
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self.process = self.target.GetProcess()
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self.thread = self.process.GetSelectedThread()
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self.frame = self.thread.GetSelectedFrame()
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self.tRString = self.target.FindFirstType("struct RString").GetPointerType()
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self.tRArray = self.target.FindFirstType("struct RArray").GetPointerType()
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rb_cft_len = len("rb_control_frame_t")
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method_type_length = sorted(map(len, self.VM_FRAME_MAGIC_NAME.values()), reverse=True)[0]
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# cfp address, method type, function name
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self.fmt = "%%-%ds %%-%ds %%s" % (rb_cft_len, method_type_length)
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def vm_frame_magic(self, cfp):
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ep = cfp.GetValueForExpressionPath("->ep")
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frame_type = ep.GetChildAtIndex(0).GetValueAsUnsigned() & self.VM_FRAME_MAGIC_MASK
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return self.VM_FRAME_MAGIC_NAME.get(frame_type, "(none)")
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def rb_iseq_path_str(self, iseq):
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tRBasic = self.target.FindFirstType("struct RBasic").GetPointerType()
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pathobj = iseq.GetValueForExpressionPath("->body->location.pathobj")
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pathobj = pathobj.Cast(tRBasic)
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flags = pathobj.GetValueForExpressionPath("->flags").GetValueAsUnsigned()
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flType = flags & RUBY_T_MASK
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if flType == RUBY_T_ARRAY:
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pathobj = pathobj.Cast(self.tRArray)
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if flags & RUBY_FL_USER1:
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len = ((flags & (RUBY_FL_USER3|RUBY_FL_USER4)) >> (RUBY_FL_USHIFT+3))
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ptr = pathobj.GetValueForExpressionPath("->as.ary")
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else:
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len = pathobj.GetValueForExpressionPath("->as.heap.len").GetValueAsSigned()
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ptr = pathobj.GetValueForExpressionPath("->as.heap.ptr")
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pathobj = ptr.GetChildAtIndex(0)
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pathobj = pathobj.Cast(self.tRString)
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ptr, len = string2cstr(pathobj)
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err = lldb.SBError()
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path = self.target.process.ReadMemory(ptr, len, err)
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if err.Success():
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return path.decode("utf-8")
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else:
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return "unknown"
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def dump_iseq_frame(self, cfp, iseq):
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m = self.vm_frame_magic(cfp)
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if iseq.GetValueAsUnsigned():
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iseq_label = iseq.GetValueForExpressionPath("->body->location.label")
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path = self.rb_iseq_path_str(iseq)
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ptr, len = string2cstr(iseq_label.Cast(self.tRString))
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err = lldb.SBError()
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iseq_name = self.target.process.ReadMemory(ptr, len, err)
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if err.Success():
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iseq_name = iseq_name.decode("utf-8")
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else:
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iseq_name = "error!!"
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else:
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print("No iseq", file=self.result)
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print(self.fmt % (("%0#12x" % cfp.GetAddress().GetLoadAddress(self.target)), m, "%s %s" % (path, iseq_name)), file=self.result)
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def dump_cfunc_frame(self, cfp):
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print(self.fmt % ("%0#12x" % (cfp.GetAddress().GetLoadAddress(self.target)), "CFUNC", ""), file=self.result)
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def print_bt(self, ec):
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tRbExecutionContext_t = self.target.FindFirstType("rb_execution_context_t")
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ec = ec.Cast(tRbExecutionContext_t.GetPointerType())
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vm_stack = ec.GetValueForExpressionPath("->vm_stack")
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vm_stack_size = ec.GetValueForExpressionPath("->vm_stack_size")
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last_cfp_frame = ec.GetValueForExpressionPath("->cfp")
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cfp_type_p = last_cfp_frame.GetType()
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stack_top = vm_stack.GetValueAsUnsigned() + (
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vm_stack_size.GetValueAsUnsigned() * vm_stack.GetType().GetByteSize())
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cfp_frame_size = cfp_type_p.GetPointeeType().GetByteSize()
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start_cfp = stack_top
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# Skip dummy frames
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start_cfp -= cfp_frame_size
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start_cfp -= cfp_frame_size
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last_cfp = last_cfp_frame.GetValueAsUnsigned()
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size = ((start_cfp - last_cfp) / cfp_frame_size) + 1
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print(self.fmt % ("rb_control_frame_t", "TYPE", ""), file=self.result)
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curr_addr = start_cfp
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while curr_addr >= last_cfp:
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cfp = self.target.CreateValueFromAddress("cfp", lldb.SBAddress(curr_addr, self.target), cfp_type_p.GetPointeeType())
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ep = cfp.GetValueForExpressionPath("->ep")
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iseq = cfp.GetValueForExpressionPath("->iseq")
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frame_type = ep.GetChildAtIndex(0).GetValueAsUnsigned() & self.VM_FRAME_MAGIC_MASK
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if iseq.GetValueAsUnsigned():
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pc = cfp.GetValueForExpressionPath("->pc")
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if pc.GetValueAsUnsigned():
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self.dump_iseq_frame(cfp, iseq)
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else:
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if frame_type == self.VM_FRAME_MAGIC_CFUNC:
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self.dump_cfunc_frame(cfp)
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curr_addr -= cfp_frame_size
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def lldb_init(debugger):
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target = debugger.GetSelectedTarget()
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global SIZEOF_VALUE
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@ -360,6 +503,25 @@ def dump_node(debugger, command, ctx, result, internal_dict):
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dump = ctx.frame.EvaluateExpression("(struct RString*)rb_parser_dump_tree((NODE*)(%s), 0)" % node)
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output_string(ctx, result, dump)
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def rb_backtrace(debugger, command, result, internal_dict):
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bt = BackTrace(debugger, command, result, internal_dict)
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frame = bt.frame
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if command:
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if frame.IsValid():
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val = frame.EvaluateExpression(command)
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else:
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val = target.EvaluateExpression(command)
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error = val.GetError()
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if error.Fail():
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print >> result, error
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return
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else:
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print("Need an EC for now")
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bt.print_bt(val)
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def __lldb_init_module(debugger, internal_dict):
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debugger.HandleCommand("command script add -f lldb_cruby.lldb_rp rp")
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debugger.HandleCommand("command script add -f lldb_cruby.count_objects rb_count_objects")
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@ -367,5 +529,6 @@ def __lldb_init_module(debugger, internal_dict):
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debugger.HandleCommand("command script add -f lldb_cruby.dump_node dump_node")
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debugger.HandleCommand("command script add -f lldb_cruby.heap_page heap_page")
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debugger.HandleCommand("command script add -f lldb_cruby.heap_page_body heap_page_body")
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debugger.HandleCommand("command script add -f lldb_cruby.rb_backtrace rbbt")
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lldb_init(debugger)
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print("lldb scripts for ruby has been installed.")
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