1import os,json,struct,signal
2
3from typing import Any, Dict
4
5import lldb
6from lldb.plugins.scripted_process import ScriptedProcess
7from lldb.plugins.scripted_process import ScriptedThread
8
9from lldb.macosx.crashlog import CrashLog,CrashLogParser
10
11class CrashLogScriptedProcess(ScriptedProcess):
12    def parse_crashlog(self):
13        try:
14            crash_log = CrashLogParser().parse(self.dbg, self.crashlog_path, False)
15        except Exception as e:
16            return
17
18        self.pid = crash_log.process_id
19        self.addr_mask = crash_log.addr_mask
20        self.crashed_thread_idx = crash_log.crashed_thread_idx
21        self.loaded_images = []
22
23        def load_images(self, images):
24            #TODO: Add to self.loaded_images and load images in lldb
25            if images:
26                for image in images:
27                    if image not in self.loaded_images:
28                        err = image.add_module(self.target)
29                        if err:
30                            print(err)
31                        else:
32                            self.loaded_images.append(image)
33
34        for thread in crash_log.threads:
35            if self.load_all_images:
36                load_images(self, crash_log.images)
37            elif thread.did_crash():
38                for ident in thread.idents:
39                    load_images(self, crash_log.find_images_with_identifier(ident))
40
41            self.threads[thread.index] = CrashLogScriptedThread(self, None, thread)
42
43    def __init__(self, target: lldb.SBTarget, args : lldb.SBStructuredData):
44        super().__init__(target, args)
45
46        if not self.target or not self.target.IsValid():
47            return
48
49        self.crashlog_path = None
50
51        crashlog_path = args.GetValueForKey("crashlog_path")
52        if crashlog_path and crashlog_path.IsValid():
53            if crashlog_path.GetType() == lldb.eStructuredDataTypeString:
54                self.crashlog_path = crashlog_path.GetStringValue(4096)
55
56        if not self.crashlog_path:
57            return
58
59        load_all_images = args.GetValueForKey("load_all_images")
60        if load_all_images and load_all_images.IsValid():
61            if load_all_images.GetType() == lldb.eStructuredDataTypeBoolean:
62                self.load_all_images = load_all_images.GetBooleanValue()
63
64        if not self.load_all_images:
65            self.load_all_images = False
66
67        self.pid = super().get_process_id()
68        self.crashed_thread_idx = 0
69        self.parse_crashlog()
70
71    def get_memory_region_containing_address(self, addr: int) -> lldb.SBMemoryRegionInfo:
72        return None
73
74    def get_thread_with_id(self, tid: int):
75        return {}
76
77    def get_registers_for_thread(self, tid: int):
78        return {}
79
80    def read_memory_at_address(self, addr: int, size: int) -> lldb.SBData:
81        # NOTE: CrashLogs don't contain any memory.
82        return lldb.SBData()
83
84    def get_loaded_images(self):
85        # TODO: Iterate over corefile_target modules and build a data structure
86        # from it.
87        return self.loaded_images
88
89    def get_process_id(self) -> int:
90        return self.pid
91
92    def should_stop(self) -> bool:
93        return True
94
95    def is_alive(self) -> bool:
96        return True
97
98    def get_scripted_thread_plugin(self):
99        return CrashLogScriptedThread.__module__ + "." + CrashLogScriptedThread.__name__
100
101class CrashLogScriptedThread(ScriptedThread):
102    def create_register_ctx(self):
103        if not self.has_crashed:
104            return dict.fromkeys([*map(lambda reg: reg['name'], self.register_info['registers'])] , 0)
105
106        if not self.backing_thread or not len(self.backing_thread.registers):
107            return dict.fromkeys([*map(lambda reg: reg['name'], self.register_info['registers'])] , 0)
108
109        for reg in self.register_info['registers']:
110            reg_name = reg['name']
111            if reg_name in self.backing_thread.registers:
112                self.register_ctx[reg_name] = self.backing_thread.registers[reg_name]
113            else:
114                self.register_ctx[reg_name] = 0
115
116        return self.register_ctx
117
118    def create_stackframes(self):
119        if not (self.scripted_process.load_all_images or self.has_crashed):
120            return None
121
122        if not self.backing_thread or not len(self.backing_thread.frames):
123            return None
124
125        for frame in self.backing_thread.frames:
126            frame_pc = frame.pc & self.scripted_process.addr_mask
127            pc = frame_pc if frame.index == 0  or frame_pc == 0 else frame_pc - 1
128            sym_addr = lldb.SBAddress()
129            sym_addr.SetLoadAddress(pc, self.target)
130            if not sym_addr.IsValid():
131                continue
132            self.frames.append({"idx": frame.index, "pc": pc})
133
134        return self.frames
135
136    def __init__(self, process, args, crashlog_thread):
137        super().__init__(process, args)
138
139        self.backing_thread = crashlog_thread
140        self.idx = self.backing_thread.index
141        self.tid = self.backing_thread.id
142        self.name = self.backing_thread.name
143        self.queue = self.backing_thread.queue
144        self.has_crashed = (self.scripted_process.crashed_thread_idx == self.idx)
145        self.create_stackframes()
146
147    def get_state(self):
148        if not self.has_crashed:
149            return lldb.eStateStopped
150        return lldb.eStateCrashed
151
152    def get_stop_reason(self) -> Dict[str, Any]:
153        if not self.has_crashed:
154            return { "type": lldb.eStopReasonNone, "data": {  }}
155        # TODO: Investigate what stop reason should be reported when crashed
156        return { "type": lldb.eStopReasonException, "data": { "desc": "EXC_BAD_ACCESS" }}
157
158    def get_register_context(self) -> str:
159        if not self.register_ctx:
160            self.register_ctx = self.create_register_ctx()
161
162        return struct.pack("{}Q".format(len(self.register_ctx)), *self.register_ctx.values())
163