1 files changed, 57 insertions, 0 deletions
diff --git a/examples/python/shadow.py b/examples/python/shadow.py
new file mode 100644
index 0000000000000..d1a5878fcef8a
--- /dev/null
+++ b/examples/python/shadow.py
@@ -0,0 +1,57 @@
+#!/usr/bin/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 >>result, "process must be stopped, state is %s" % lldb.SBDebugger.StateAsCString(state)
+        return        
+    frame = exe_ctx.GetFrame()
+    if not frame:
+        print >>result, "invalid frame"
+        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 >>result, str(shadow_var.GetDeclaration())
+    if num_shadowed_variables == 0:
+        print >>result, 'no variables are shadowed'
+