[all-commits] [llvm/llvm-project] 16f793: [lldb] Fix synthetic frame identity loss during in...

[Alexandre Perez via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 16f793876e0768f6e322918d1cd99f4d85a2e30d
      https://github.com/llvm/llvm-project/commit/16f793876e0768f6e322918d1cd99f4d85a2e30d
  Author: Alexandre Perez <alexandreperez at meta.com>
  Date:   2026-04-14 (Tue, 14 Apr 2026)

  Changed paths:
    M lldb/source/Target/StackFrameList.cpp
    M lldb/test/API/functionalities/scripted_frame_provider/TestScriptedFrameProvider.py

  Log Message:
  -----------
  [lldb] Fix synthetic frame identity loss during incremental fetches (#191903)

When `SyntheticStackFrameList::FetchFramesUpTo` is called incrementally,
PC-less synthetic frames can end up with identical `StackID` values.
This happens because `num_synthetic_frames` is reset to zero on each
call, handing out duplicate call frame addresses. Since PC-less frames
all share `LLDB_INVALID_ADDRESS` as their PC, the `StackID` equality
check cannot distinguish them, and `ExecutionContextRef` resolves the
wrong frame.

The fix counts existing synthetic frames in `m_frames` before starting
the fetch loop so new frames receive unique call frame addresses.



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