![]() Program, and getting to the find_word function in LLDB. The first bit of code above shows starting lldb, attaching to the dictionary > path = tree_utils.DFS (root, "Romeo", current_path) To exit, type 'quit()', 'exit()' or Ctrl-D. * thread #1: tid = 0x2c03, 0x00007fff86c8bea0 libSystem.B.dylib`read$NOCANCEL + 8, stop reason = signal SIGSTOPįrame #0: 0x00007fff86c8bea0 libSystem.B.dylib`read$NOCANCEL + 8īreakpoint created: 1: name = 'find_word', locations = 1, resolved = 1 Tree_utils.py) and then importing it into your LLDB Python interpreter. Longer, more complicated script functions in a separate file (in this case Therefore we recommend doing as we have done: Writing your ![]() Interpreter can be difficult, as making a single typing mistake means having to One other note: Typing something as long as our DFS function directly into the Lines 20-25 are the same as lines 14-19, except for going right rather Indicate we are going left (line 18), and then recurse on the left child (lineġ9). Otherwise, we add an “L” to the end of our current path string, to Pointer is NULL, then the word is not in this tree and we return an empty path Pointer child is NULL (“None” is the Python equivalent of NULL). If we decide to go left, line 15 checks to see if the left Otherwise, line 14 checks to see if we should go left (search word comes before If so, we are done, and line 13 returns the current path. Line 12 checks to see if the word in the current node is the one we are Quotes around its result, lines 6-11 strip surrounding quotes off the word. Get a string containing the value out of the pointer. Pointer to our word, and we want the actual word, line 5 calls GetSummary() to Lines 2-4 of our DFS function get the word, left and right fields out of theĬurrent node and store them in Python variables. Ready to do the actual search lines 12-25 are the actual depth-first search. Lines 2-11 of DFS are getting data out of the current tree node and getting SBFrame.FindVariable on the ame object to give us our dictionary One of the things we can do with a frame object, is to ask it SBFrame (see the LLDB API for more information about SBFrame Running Pythonįrom inside LLDB, LLDB will automatically give us our current frame Kind of Python variable will it be? The answers are to use the LLDB APIįunctions, provided as part of the LLDB Python module. Variable out of our program and put it into a Python variable? What That needs to contain a node in our search tree. ![]() The most interesting parameter is the first one, the Python variable String representing the path from the root of the tree to our current The word we are searching for (a string), and the third parameter is a The first parameter is going to be a node in ourīinary search tree, put into a Python variable. To show you how to do this we will look at the parameters for Variables, we need to get the variable into a form that Python canĪccess. Accessing & Manipulating Program Variables ¶īefore we can call any Python function on any of our program’s
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