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#!/usr/bin/env python
import lldb
import shlex
@lldb.command("shadow")
def check_shadow_command(debugger, command, exe_ctx, result, dict):
"""Check the currently selected stack frame for shadowed variables"""
process = exe_ctx.GetProcess()
state = process.GetState()
if state != lldb.eStateStopped:
print(
"process must be stopped, state is %s"
% lldb.SBDebugger.StateAsCString(state),
file=result,
)
return
frame = exe_ctx.GetFrame()
if not frame:
print("invalid frame", file=result)
return
# Parse command line args
command_args = shlex.split(command)
# TODO: add support for using arguments that are passed to this command...
# Make a dictionary of variable name to "SBBlock and SBValue"
shadow_dict = {}
num_shadowed_variables = 0
# Get the deepest most block from the current frame
block = frame.GetBlock()
# Iterate through the block and all of its parents
while block.IsValid():
# Get block variables from the current block only
block_vars = block.GetVariables(frame, True, True, True, 0)
# Iterate through all variables in the current block
for block_var in block_vars:
# Since we can have multiple shadowed variables, we our variable
# name dictionary to have an array or "block + variable" pairs so
# We can correctly print out all shadowed variables and whow which
# blocks they come from
block_var_name = block_var.GetName()
if block_var_name in shadow_dict:
shadow_dict[block_var_name].append(block_var)
else:
shadow_dict[block_var_name] = [block_var]
# Get the parent block and continue
block = block.GetParent()
num_shadowed_variables = 0
if shadow_dict:
for name in shadow_dict.keys():
shadow_vars = shadow_dict[name]
if len(shadow_vars) > 1:
print('"%s" is shadowed by the following declarations:' % (name))
num_shadowed_variables += 1
for shadow_var in shadow_vars:
print(str(shadow_var.GetDeclaration()), file=result)
if num_shadowed_variables == 0:
print("no variables are shadowed", file=result)
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