[all-commits] [llvm/llvm-project] 624813: Change the dyld notification function that lldb pu...

[Jason Molenda via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 624813a4f41c5945dc8f8d998173960ad75db731
      https://github.com/llvm/llvm-project/commit/624813a4f41c5945dc8f8d998173960ad75db731
  Author: Jason Molenda <jason at molenda.com>
  Date:   2023-06-30 (Fri, 30 Jun 2023)

  Changed paths:
    M lldb/source/Plugins/DynamicLoader/MacOSX-DYLD/DynamicLoaderMacOS.cpp

  Log Message:
  -----------
  Change the dyld notification function that lldb puts a breakpoint in

On Darwin systems, the dynamic linker dyld has an empty function
it calls when binaries are added/removed from the process.  lldb puts
a breakpoint on this dyld function to catch the notifications.  The
function arguments are used by lldb to tell what is happening.

The linker has a natural representation when the addresses of
binaries being added/removed are in the pointer size of the process.
There is then a second function where the addresses of the binaries
are in a uint64_t array, which the debugger has been using before -
dyld allocates memory for the array, copies the values in to it,
and calls it for lldb's benefit.

This changes to using the native notifier function, with pointer-sized
addresses.

Differential Revision: https://reviews.llvm.org/D139453