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1 #!/usr/bin/env python
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150
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2 from __future__ import print_function
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3
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4 import lldb
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5 import shlex
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6
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7
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8 @lldb.command("shadow")
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9 def check_shadow_command(debugger, command, exe_ctx, result, dict):
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10 '''Check the currently selected stack frame for shadowed variables'''
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11 process = exe_ctx.GetProcess()
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12 state = process.GetState()
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13 if state != lldb.eStateStopped:
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14 print("process must be stopped, state is %s" % lldb.SBDebugger.StateAsCString(
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15 state), file=result)
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16 return
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17 frame = exe_ctx.GetFrame()
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18 if not frame:
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19 print("invalid frame", file=result)
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20 return
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21 # Parse command line args
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22 command_args = shlex.split(command)
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23 # TODO: add support for using arguments that are passed to this command...
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24
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25 # Make a dictionary of variable name to "SBBlock and SBValue"
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26 shadow_dict = {}
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27
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28 num_shadowed_variables = 0
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29 # Get the deepest most block from the current frame
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30 block = frame.GetBlock()
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31 # Iterate through the block and all of its parents
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32 while block.IsValid():
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33 # Get block variables from the current block only
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34 block_vars = block.GetVariables(frame, True, True, True, 0)
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35 # Iterate through all variables in the current block
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36 for block_var in block_vars:
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37 # Since we can have multiple shadowed variables, we our variable
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38 # name dictionary to have an array or "block + variable" pairs so
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39 # We can correctly print out all shadowed variables and whow which
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40 # blocks they come from
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41 block_var_name = block_var.GetName()
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42 if block_var_name in shadow_dict:
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43 shadow_dict[block_var_name].append(block_var)
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44 else:
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45 shadow_dict[block_var_name] = [block_var]
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46 # Get the parent block and continue
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47 block = block.GetParent()
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48
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49 num_shadowed_variables = 0
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50 if shadow_dict:
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51 for name in shadow_dict.keys():
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52 shadow_vars = shadow_dict[name]
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53 if len(shadow_vars) > 1:
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54 print('"%s" is shadowed by the following declarations:' % (name))
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55 num_shadowed_variables += 1
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56 for shadow_var in shadow_vars:
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57 print(str(shadow_var.GetDeclaration()), file=result)
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58 if num_shadowed_variables == 0:
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59 print('no variables are shadowed', file=result)
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