[lldb] Parse and display reporting errors from JSON crashlogs

JSON crashlogs have an optional field named reportNotes that contains
any potential errors encountered by the crash reporter when generating
the crashlog. Parse and display them in LLDB.

Differential revision: https://reviews.llvm.org/D111339

Author: JDevlieghere

lldb/examples/python/crashlog.py

@@ -334,6 +334,7 @@ def __init__(self, debugger, path, verbose):
         self.threads = list()
         self.backtraces = list()  # For application specific backtraces
         self.idents = list()  # A list of the required identifiers for doing all stack backtraces
+        self.errors = list()
         self.crashed_thread_idx = -1
         self.version = -1
         self.target = None
@@ -437,6 +438,7 @@ def parse(self):
             self.parse_process_info(self.data)
             self.parse_images(self.data['usedImages'])
             self.parse_threads(self.data['threads'])
+            self.parse_errors(self.data)
             thread = self.crashlog.threads[self.crashlog.crashed_thread_idx]
             reason = self.parse_crash_reason(self.data['exception'])
             if thread.reason:
@@ -528,6 +530,10 @@ def parse_thread_registers(self, json_thread_state):
                pass
         return registers
 
+    def parse_errors(self, json_data):
+       if 'reportNotes' in json_data:
+          self.crashlog.errors = json_data['reportNotes']
+
 
 class CrashLogParseMode:
     NORMAL = 0
@@ -1067,6 +1073,11 @@ def SymbolicateCrashLog(crash_log, options):
         thread.dump_symbolicated(crash_log, options)
         print()
 
+    if crash_log.errors:
+        print("Errors:")
+        for error in crash_log.errors:
+            print(error)
+
 
 def CreateSymbolicateCrashLogOptions(
         command_name,

lldb/test/Shell/ScriptInterpreter/Python/Crashlog/Inputs/a.out.ips

@@ -170,5 +170,9 @@
   "threadTriggered" : {
     "queue" : "com.apple.main-thread"
   }
-}
+},
+  "reportNotes" : [
+  "invalid foo",
+  "invalid bar"
+]
 }

lldb/test/Shell/ScriptInterpreter/Python/Crashlog/json.test

@@ -13,3 +13,5 @@
 # CHECK: [  1] {{.*}}out`bar + 8 at test.c
 # CHECK: [  2] {{.*}}out`main + 19 at test.c
 # CHECK: rbp = 0x00007ffeec22a530
+# CHECK: invalid foo
+# CHECK: invalid bar