[PATCH] D158124: [dsymutil] Add support for mergeable libraries

[Alpha Abdoulaye via Phabricator via llvm-commits]

Alpha created this revision.
Alpha added reviewers: JDevlieghere, avl.
Herald added a subscriber: hiraditya.
Herald added a reviewer: jhenderson.
Herald added a project: All.
Alpha requested review of this revision.
Herald added subscribers: llvm-commits, MaskRay.
Herald added a project: LLVM.

This adds support in dsymutil for mergeable libraries <https://developer.apple.com/documentation/xcode/configuring-your-project-to-use-mergeable-libraries>.

dsymutil reads a new stab emitted by ld, allowing it to operate on dynamic libraries instead of object files. It also now loads the Dwarf files associated to the libraries, and build the debug map for each binary from the list of symbols exported by the library.
For each Debug Map Object, there is a new associated Relocation Map which is serialized from the information retrieved in the original debug_info (or debug_addr) section of the .o file.

The final DWARF file has multiple compile units, so the offsets information of the relocations are adjusted relatively to the compile unit they will end up belonging to, inside the final linked DWARF file.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D158124

Files:
  llvm/include/llvm/BinaryFormat/Dwarf.def
  llvm/include/llvm/BinaryFormat/MachO.h
  llvm/include/llvm/DWARFLinker/DWARFLinker.h
  llvm/include/llvm/DWARFLinker/DWARFLinkerCompileUnit.h
  llvm/include/llvm/DWARFLinkerParallel/AddressesMap.h
  llvm/include/llvm/TargetParser/Triple.h
  llvm/lib/DWARFLinker/DWARFLinker.cpp
  llvm/lib/TargetParser/Triple.cpp
  llvm/test/tools/dsymutil/Inputs/bar-relink-variant.dylib.dSYM/Contents/Info.plist
  llvm/test/tools/dsymutil/Inputs/bar-relink-variant.dylib.dSYM/Contents/Resources/DWARF/bar-relink-variant.dylib
  llvm/test/tools/dsymutil/Inputs/bar-relink-variant.dylib.dSYM/Contents/Resources/Relocations/aarch64/bar-relink-variant.dylib.yml
  llvm/test/tools/dsymutil/Inputs/bar-relink.dylib.dSYM/Contents/Info.plist
  llvm/test/tools/dsymutil/Inputs/bar-relink.dylib.dSYM/Contents/Resources/DWARF/bar-relink.dylib
  llvm/test/tools/dsymutil/Inputs/bar-relink.dylib.dSYM/Contents/Resources/Relocations/aarch64/bar-relink.dylib.yml
  llvm/test/tools/dsymutil/Inputs/basic-relink.macho.arm64.dylib
  llvm/test/tools/dsymutil/Inputs/basic-relink.macho.arm64.o
  llvm/test/tools/dsymutil/Inputs/foo-relink-variant.dylib.dSYM/Contents/Info.plist
  llvm/test/tools/dsymutil/Inputs/foo-relink-variant.dylib.dSYM/Contents/Resources/DWARF/foo-relink-variant.dylib
  llvm/test/tools/dsymutil/Inputs/foo-relink-variant.dylib.dSYM/Contents/Resources/DWARF/foo-relink-variant_debug.dylib
  llvm/test/tools/dsymutil/Inputs/foo-relink-variant.dylib.dSYM/Contents/Resources/Relocations/aarch64/foo-relink-variant.dylib.yml
  llvm/test/tools/dsymutil/Inputs/foo-relink.dylib.dSYM/Contents/Info.plist
  llvm/test/tools/dsymutil/Inputs/foo-relink.dylib.dSYM/Contents/Resources/DWARF/foo-relink.dylib
  llvm/test/tools/dsymutil/Inputs/foo-relink.dylib.dSYM/Contents/Resources/Relocations/aarch64/foo-relink.dylib.yml
  llvm/test/tools/dsymutil/Inputs/proxy-relink.dylib.dSYM/Contents/Info.plist
  llvm/test/tools/dsymutil/Inputs/proxy-relink.dylib.dSYM/Contents/Resources/DWARF/proxy-relink.dylib
  llvm/test/tools/dsymutil/Inputs/proxy-relink.dylib.dSYM/Contents/Resources/Relocations/aarch64/proxy-relink.dylib.yml
  llvm/test/tools/dsymutil/Inputs/two-level-relink.macho.arm64.dylib
  llvm/test/tools/dsymutil/Inputs/variant-relink.macho.arm64.dylib
  llvm/test/tools/dsymutil/basic-linking.test
  llvm/tools/dsymutil/CMakeLists.txt
  llvm/tools/dsymutil/DebugMap.cpp
  llvm/tools/dsymutil/DebugMap.h
  llvm/tools/dsymutil/DwarfLinkerForBinary.cpp
  llvm/tools/dsymutil/DwarfLinkerForBinary.h
  llvm/tools/dsymutil/LinkUtils.h
  llvm/tools/dsymutil/MachODebugMapParser.cpp
  llvm/tools/dsymutil/Options.td
  llvm/tools/dsymutil/RelocationMap.cpp
  llvm/tools/dsymutil/RelocationMap.h
  llvm/tools/dsymutil/dsymutil.cpp
  llvm/tools/dsymutil/dsymutil.h
  llvm/tools/llvm-dwarfutil/DebugInfoLinker.cpp
  llvm/tools/llvm-nm/llvm-nm.cpp

-------------- next part --------------
A non-text attachment was scrubbed...
Name: D158124.550902.patch
Type: text/x-patch
Size: 75494 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20230816/5a835290/attachment.bin>