[llvm] [llvm-readobj] Dump callgraph section info for ELF (PR #157499)

[James Henderson via llvm-commits]

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@@ -5263,6 +5299,181 @@ template <class ELFT> void GNUELFDumper<ELFT>::printCGProfile() {
   OS << "GNUStyle::printCGProfile not implemented\n";
 }
 
+namespace callgraph {
+LLVM_ENABLE_BITMASK_ENUMS_IN_NAMESPACE();
+enum Flags : uint8_t {
+  None = 0,
+  IsIndirectTarget = 1u << 0,
+  HasDirectCallees = 1u << 1,
+  HasIndirectCallees = 1u << 2,
+  LLVM_MARK_AS_BITMASK_ENUM(/*LargestValue*/ HasIndirectCallees)
+};
+} // namespace callgraph
+
+template <class ELFT> bool ELFDumper<ELFT>::processCallGraphSection() {
+  const Elf_Shdr *CGSection = findSectionByName(".llvm.callgraph");
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jh7370 wrote:

Is .llvm.callgraph a new section, or a long pre-existing section that we're just gaining functionality to dump now? If it's new, a much-preferred approach would be to give the section a specific type, as type lookup is more appropriate for ELF than name lookup (and much faster, especially in large objects).

https://github.com/llvm/llvm-project/pull/157499