[all-commits] [llvm/llvm-project] 28fb39: [lldb] Adjust for changes in objc runtime

[Alex via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 28fb39f16af1003e53008b75c11127b3288742f8
      https://github.com/llvm/llvm-project/commit/28fb39f16af1003e53008b75c11127b3288742f8
  Author: Alex Langford <alangford at apple.com>
  Date:   2023-06-22 (Thu, 22 Jun 2023)

  Changed paths:
    M lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCClassDescriptorV2.cpp
    M lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCClassDescriptorV2.h
    M lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
    M lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.h
    M lldb/test/API/lang/objc/exceptions/TestObjCExceptions.py

  Log Message:
  -----------
  [lldb] Adjust for changes in objc runtime

The Objective-C runtime and the shared cache has changed slightly.
Given a class_ro_t, the baseMethods ivar is now a pointer union and may
either be a method_list_t pointer or a pointer to a relative list of
lists. The entries of this relative list of lists are indexes that refer
to a specific image in the shared cache in addition to a pointer offset
to find the accompanying method_list_t. We have to go over each of these
entries, parse it, and then if the relevant image is loaded in the
process, we add those methods to the relevant clang Decl.

In order to determine if an image is loaded, the Objective-C runtime
exposes a symbol that lets us determine if a particular image is loaded.
We maintain a data structure SharedCacheImageHeaders to keep track of
that information.

There is a known issue where if an image is loaded after we create a
Decl for a class, the Decl will not have the relevant methods from that
image (i.e. for Categories).

rdar://107957209

Differential Revision: https://reviews.llvm.org/D153597