[llvm-objdump] -r: support CREL

Extract the llvm-readelf decoder to `decodeCrel` (#91280) and reuse it
for llvm-objdump.

Because the section representation of LLVMObject (`SectionRef`) is
64-bit, insufficient to hold all decoder states, `section_rel_begin` is
modified to decode CREL eagerly and hold the decoded relocations inside
ELFObjectFile<ELFT>.

The test is adapted from llvm/test/tools/llvm-readobj/ELF/crel.test.

Pull Request: https://github.com/llvm/llvm-project/pull/97382

1 files changed, 11 insertions, 0 deletions

diff --git a/llvm/lib/Object/ELFObjectFile.cpp b/llvm/lib/Object/ELFObjectFile.cpp
index cbc55a1..53c3de0 100644
--- a/llvm/lib/Object/ELFObjectFile.cpp
+++ b/llvm/lib/Object/ELFObjectFile.cpp
@@ -1013,3 +1013,14 @@ Expected<std::vector<BBAddrMap>> ELFObjectFileBase::readBBAddrMap(
   return readBBAddrMapImpl(cast<ELF64BEObjectFile>(this)->getELFFile(),
                            TextSectionIndex, PGOAnalyses);
 }
+
+StringRef ELFObjectFileBase::getCrelDecodeProblem(SectionRef Sec) const {
+  auto Data = Sec.getRawDataRefImpl();
+  if (const auto *Obj = dyn_cast<ELF32LEObjectFile>(this))
+    return Obj->getCrelDecodeProblem(Data);
+  if (const auto *Obj = dyn_cast<ELF32BEObjectFile>(this))
+    return Obj->getCrelDecodeProblem(Data);
+  if (const auto *Obj = dyn_cast<ELF64LEObjectFile>(this))
+    return Obj->getCrelDecodeProblem(Data);
+  return cast<ELF64BEObjectFile>(this)->getCrelDecodeProblem(Data);
+}