[ObjectYAML][MachO] Add LC_FUNCTION_STARTS support

This adds support for encoding and decoding the LC_FUNCTION_STARTS load
command payload.

Differential Revision: https://reviews.llvm.org/D119205

1 files changed, 15 insertions, 1 deletions

diff --git a/llvm/lib/Object/MachOObjectFile.cpp b/llvm/lib/Object/MachOObjectFile.cpp
index 909a4cf..85f3824 100644
--- a/llvm/lib/Object/MachOObjectFile.cpp
+++ b/llvm/lib/Object/MachOObjectFile.cpp
@@ -1303,7 +1303,6 @@ MachOObjectFile::MachOObjectFile(MemoryBufferRef Object, bool IsLittleEndian,
   }
 
   const char *DyldIdLoadCmd = nullptr;
-  const char *FuncStartsLoadCmd = nullptr;
   const char *SplitInfoLoadCmd = nullptr;
   const char *CodeSignDrsLoadCmd = nullptr;
   const char *CodeSignLoadCmd = nullptr;
@@ -4663,6 +4662,21 @@ ArrayRef<uint8_t> MachOObjectFile::getDyldInfoExportsTrie() const {
   return makeArrayRef(Ptr, DyldInfo.export_size);
 }
 
+SmallVector<uint64_t> MachOObjectFile::getFunctionStarts() const {
+  if (!FuncStartsLoadCmd)
+    return {};
+
+  auto InfoOrErr =
+      getStructOrErr<MachO::linkedit_data_command>(*this, FuncStartsLoadCmd);
+  if (!InfoOrErr)
+    return {};
+
+  MachO::linkedit_data_command Info = InfoOrErr.get();
+  SmallVector<uint64_t, 8> FunctionStarts;
+  this->ReadULEB128s(Info.dataoff, FunctionStarts);
+  return std::move(FunctionStarts);
+}
+
 ArrayRef<uint8_t> MachOObjectFile::getUuid() const {
   if (!UuidLoadCmd)
     return None;