Use new unwinder for offline in libbacktrace.

libbbacktrace changes:
- Completely rewrite the BacktraceOffline class to use the new unwinder.
- Modify the test data to save ucontext_t data instead of unw_context data.
- Convert the previous tests from unw_context data to ucontext_t data.

Bug: 65682279

Test: New unit tests pass in libunwindstack.
Test: All offline tests continue to pass.
Change-Id: I540345c304b20199d46deeb0349a0638a0f3ab2f

1 files changed, 4 insertions, 0 deletions

diff --git a/libbacktrace/Backtrace.cpp b/libbacktrace/Backtrace.cpp
index 1195e5f26..dec241c3c 100644
--- a/libbacktrace/Backtrace.cpp
+++ b/libbacktrace/Backtrace.cpp
@@ -168,5 +168,9 @@ std::string Backtrace::GetErrorString(BacktraceUnwindError error) {
       return "Failed to find a function in debug sections";
     case BACKTRACE_UNWIND_ERROR_EXECUTE_DWARF_INSTRUCTION_FAILED:
       return "Failed to execute dwarf instructions in debug sections";
+    case BACKTRACE_UNWIND_ERROR_UNWIND_INFO:
+      return "Failed to unwind due to invalid unwind information";
+    case BACKTRACE_UNWIND_ERROR_REPEATED_FRAME:
+      return "Failed to unwind due to same sp/pc repeating";
   }
 }