|
| 1 | +use anyhow::{Context, Error, Result}; |
| 2 | + |
| 3 | +use remoteprocess::ProcessMemory; |
| 4 | + |
| 5 | +use crate::python_data_access::{format_variable, PY_TPFLAGS_MANAGED_DICT, DictIterator, copy_string}; |
| 6 | +use crate::python_interpreters::{ |
| 7 | + GcHead, HasGcGenerations, InterpreterState, Object, TypeObject, |
| 8 | +}; |
| 9 | +use crate::version::Version; |
| 10 | + |
| 11 | +pub fn walk_gc<I, P>(addr: usize, type_name: Option<&str>, process: &P) -> Result<Vec<usize>, Error> |
| 12 | +where |
| 13 | + I: HasGcGenerations, |
| 14 | + P: ProcessMemory, |
| 15 | +{ |
| 16 | + let mut ret = Vec::new(); |
| 17 | + |
| 18 | + for gen in I::gc_generations(addr) { |
| 19 | + let head_addr = I::generation_head_addr(gen); |
| 20 | + let mut gc: I::GcHead = process.copy_pointer(head_addr).context("Failed to copy gen gc head")?; |
| 21 | + let mut gc_addr = gc.next(); |
| 22 | + |
| 23 | + while gc_addr as *const _ != head_addr as *const _ { |
| 24 | + gc = process.copy_pointer(gc_addr).context("Failed to copy gchead")?; |
| 25 | + |
| 26 | + let obj_addr = gc.obj_addr(gc_addr as usize); |
| 27 | + |
| 28 | + let should_add = match type_name { |
| 29 | + Some(name) => isinstance::<I, P>(obj_addr, name, process).unwrap_or(false), |
| 30 | + None => true, |
| 31 | + }; |
| 32 | + if should_add { |
| 33 | + ret.push(obj_addr); |
| 34 | + } |
| 35 | + |
| 36 | + gc_addr = gc.next(); |
| 37 | + } |
| 38 | + } |
| 39 | + Ok(ret) |
| 40 | +} |
| 41 | + |
| 42 | +fn isinstance<I, P>(addr: usize, type_name: &str, process: &P) -> Result<bool, Error> |
| 43 | +where |
| 44 | + I: InterpreterState, |
| 45 | + P: ProcessMemory, |
| 46 | +{ |
| 47 | + let value: I::Object = process.copy_struct(addr)?; |
| 48 | + let value_type = process.copy_pointer(value.ob_type())?; |
| 49 | + |
| 50 | + // get the typename (truncating to 128 bytes if longer) |
| 51 | + let max_type_len = 128; |
| 52 | + let value_type_name = process.copy(value_type.name() as usize, max_type_len)?; |
| 53 | + let length = value_type_name |
| 54 | + .iter() |
| 55 | + .position(|&x| x == 0) |
| 56 | + .unwrap_or(max_type_len); |
| 57 | + let value_type_name = std::str::from_utf8(&value_type_name[..length])?; |
| 58 | + |
| 59 | + Ok(value_type_name == type_name) |
| 60 | +} |
| 61 | + |
| 62 | +pub fn get_object_attribute<I, P>(addr: usize, path: &Vec<&str>, process: &P, version: &Version) -> Result<String, Error> |
| 63 | +where |
| 64 | + I: InterpreterState, |
| 65 | + P: ProcessMemory, |
| 66 | +{ |
| 67 | + if path.len() == 0 { |
| 68 | + return Err(format_err!("Path passed to get_object_attribute must not be empty")); |
| 69 | + } |
| 70 | + |
| 71 | + let mut cur_addr = addr; |
| 72 | + for elem in path { |
| 73 | + match resolve_attribute::<I, P>(cur_addr, elem, process, version) { |
| 74 | + Ok(resolved) => cur_addr = resolved, |
| 75 | + Err(e) => { |
| 76 | + println!("Unable to resolve attribute: {}", e); |
| 77 | + return Err(e); |
| 78 | + } |
| 79 | + }; |
| 80 | + } |
| 81 | + |
| 82 | + format_variable::<I, P>(process, version, cur_addr, 16384) |
| 83 | +} |
| 84 | + |
| 85 | +pub fn resolve_attribute<I, P>(addr: usize, name: &str, process: &P, version: &Version) -> Result<usize, Error> |
| 86 | +where |
| 87 | + I: InterpreterState, |
| 88 | + P: ProcessMemory, |
| 89 | +{ |
| 90 | + let value: I::Object = process.copy_struct(addr)?; |
| 91 | + let value_type = process.copy_pointer(value.ob_type())?; |
| 92 | + |
| 93 | + let flags = value_type.flags(); |
| 94 | + let dict_iter = if flags & PY_TPFLAGS_MANAGED_DICT != 0 { |
| 95 | + DictIterator::from_managed_dict( |
| 96 | + process, |
| 97 | + version, |
| 98 | + addr, |
| 99 | + value.ob_type() as usize, |
| 100 | + flags, |
| 101 | + )? |
| 102 | + } else { |
| 103 | + let dict_offset = value_type.dictoffset(); |
| 104 | + let dict_addr = (addr as isize + dict_offset) as usize; |
| 105 | + let thread_dict_addr: usize = process.copy_struct(dict_addr)?; |
| 106 | + DictIterator::from(process, version, thread_dict_addr)? |
| 107 | + }; |
| 108 | + |
| 109 | + for i in dict_iter { |
| 110 | + let (key, value) = i?; |
| 111 | + let varname = copy_string(key as *const I::StringObject, process)?; |
| 112 | + if varname == name { |
| 113 | + return Ok(value); |
| 114 | + } |
| 115 | + } |
| 116 | + Err(format_err!("Attribute {} not found", name)) |
| 117 | +} |
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