[lldb/crashlog] Make registers always available & fix x29/x30 parsing

[medismailben]

This patch addresses 2 issues:

1. It makes registers available on non-crashed threads all the time
2. It fixes arm64 registers parsing for registers that don't use the x prefix (fp -> x29 / lr -> x30)

[llvmbot]

@llvm/pr-subscribers-lldb

Author: Med Ismail Bennani (medismailben)

Changes

This patch addresses 2 issues:

1. It makes registers available on non-crashed threads all the time
2. It fixes arm64 registers parsing for registers that don't use the x prefix (fp -> x29 / lr -> x30)

---

Full diff: https://github.com/llvm/llvm-project/pull/145104.diff

2 Files Affected:

• (modified) lldb/examples/python/crashlog.py (+4-4)
• (modified) lldb/examples/python/crashlog_scripted_process.py (+7-5)

diff --git a/lldb/examples/python/crashlog.py b/lldb/examples/python/crashlog.py
index 5f07cda2892ab..bb20f3a25c1c1 100755
--- a/lldb/examples/python/crashlog.py
+++ b/lldb/examples/python/crashlog.py
@@ -777,10 +777,10 @@ def parse_threads(self, json_threads):
             if json_thread.get("triggered", False):
                 self.crashlog.crashed_thread_idx = idx
                 thread.crashed = True
-                if "threadState" in json_thread:
-                    thread.registers = self.parse_thread_registers(
-                        json_thread["threadState"]
-                    )
+            if "threadState" in json_thread:
+                thread.registers = self.parse_thread_registers(
+                    json_thread["threadState"]
+                )
             if "queue" in json_thread:
                 thread.queue = json_thread.get("queue")
             self.parse_frames(thread, json_thread.get("frames", []))
diff --git a/lldb/examples/python/crashlog_scripted_process.py b/lldb/examples/python/crashlog_scripted_process.py
index be0ed49d35904..f54a8df0479e7 100644
--- a/lldb/examples/python/crashlog_scripted_process.py
+++ b/lldb/examples/python/crashlog_scripted_process.py
@@ -123,11 +123,6 @@ def get_process_metadata(self):
 
 class CrashLogScriptedThread(ScriptedThread):
     def create_register_ctx(self):
-        if not self.has_crashed:
-            return dict.fromkeys(
-                [*map(lambda reg: reg["name"], self.register_info["registers"])], 0
-            )
-
         if not self.backing_thread or not len(self.backing_thread.registers):
             return dict.fromkeys(
                 [*map(lambda reg: reg["name"], self.register_info["registers"])], 0
@@ -135,8 +130,15 @@ def create_register_ctx(self):
 
         for reg in self.register_info["registers"]:
             reg_name = reg["name"]
+            reg_alt_name = None
+            if "alt-name" in reg:
+                reg_alt_name = reg["alt-name"]
             if reg_name in self.backing_thread.registers:
                 self.register_ctx[reg_name] = self.backing_thread.registers[reg_name]
+            elif reg_alt_name and reg_alt_name in self.backing_thread.registers:
+                self.register_ctx[reg_name] = self.backing_thread.registers[
+                    reg_alt_name
+                ]
             else:
                 self.register_ctx[reg_name] = 0