[all-commits] [llvm/llvm-project] 48a12a: Fix a few bugs with Mach-O corefile loading, plus ...

Jason Molenda via All-commits all-commits at lists.llvm.org
Tue May 30 15:36:57 PDT 2023

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 48a12ae8212c22d9d1d84270db659ac76ecfa972
  Author: Jason Molenda <jason at molenda.com>
  Date:   2023-05-30 (Tue, 30 May 2023)

  Changed paths:
    M lldb/include/lldb/Target/DynamicLoader.h
    M lldb/source/Core/DynamicLoader.cpp
    M lldb/source/Plugins/DynamicLoader/MacOSX-DYLD/DynamicLoaderDarwin.cpp
    M lldb/source/Plugins/ObjectFile/Mach-O/ObjectFileMachO.cpp
    M lldb/source/Plugins/Platform/MacOSX/PlatformDarwinKernel.cpp
    M lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
    M lldb/source/Plugins/Process/mach-core/ProcessMachCore.cpp
    M lldb/source/Symbol/LocateSymbolFileMacOSX.cpp

  Log Message:
  Fix a few bugs with Mach-O corefile loading, plus perf

In ProcessMachCore::LoadBinariesViaMetadata(), if we did
load some binaries via metadata in the core file, don't
then search for a userland dyld in the corefile / kernel
and throw away that binary list.  Also fix a little bug
with correctly recognizing corefiles using a `main bin spec`
LC_NOTE that explicitly declare that this is a userland

LocateSymbolFileMacOSX.cpp's Symbols::DownloadObjectAndSymbolFile
clarify the comments on how the force_lookup and how the
dbgshell_command local both have the same effect.

In PlatformDarwinKernel::LoadPlatformBinaryAndSetup, don't
log a message unless we actually found a kernel fileset.

Reorganize ObjectFileMachO::LoadCoreFileImages so that it delegates
binary searching to DynamicLoader::LoadBinaryWithUUIDAndAddress and
doesn't duplicate those searches.  For searches that fail, we would
perform them multiple times in both methods.  When we have the
mach-o segment vmaddrs for a binary, don't let LoadBinaryWithUUIDAndAddress
load the binary first at its mach-o header address in the Target;
we'll load the segments at the correct addresses individually later
in this method.

DynamicLoaderDarwin::ImageInfo::PutToLog fix a LLDB_LOG logging

In DynamicLoader::LoadBinaryWithUUIDAndAddress, instead of using
Target::GetOrCreateModule as a way to find a binary already registered
in lldb's global module cache (and implicitly add it to the Target
image list), use ModuleList::GetSharedModule() which only searches
the global module cache, don't add it to the Target.  We may not
want to add an unstripped binary to the Target.

Add a call to Symbols::DownloadObjectAndSymbolFile() even if
"force_symbol_search" isn't set -- this will turn into a
DebugSymbols call / Spotlight search on a macOS system, which
we want.

Only set the Module's LoadAddress if the caller asked us to do that.

Differential Revision: https://reviews.llvm.org/D150928

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