[Object/ELF] Provide helpers for symbol types.

These were, originally, in a different form in lld.
They can be reused for other tools, e.g. llvm-readobj.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239231 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/Object/ELFTypes.h b/include/llvm/Object/ELFTypes.h
index 85e1e019f99514c0f9b1bb5e1e346c1ef0e007fb..09a6fea53efcfddd68abebf83e4dd9a6ae980445 100644 (file)
--- a/include/llvm/Object/ELFTypes.h
+++ b/include/llvm/Object/ELFTypes.h
@@ -154,6 +154,7 @@ struct Elf_Sym_Base<ELFType<TargetEndianness, true>> {
 template <class ELFT>
 struct Elf_Sym_Impl : Elf_Sym_Base<ELFT> {
   using Elf_Sym_Base<ELFT>::st_info;
+  using Elf_Sym_Base<ELFT>::st_shndx;
   using Elf_Sym_Base<ELFT>::st_other;
 
   // These accessors and mutators correspond to the ELF32_ST_BIND,
@@ -176,6 +177,28 @@ struct Elf_Sym_Impl : Elf_Sym_Base<ELFT> {
     assert(v < 4 && "Invalid value for visibility");
     st_other = (st_other & ~0x3) | v;
   }
+
+  bool isAbsolute() const { return st_shndx == ELF::SHN_ABS; }
+  bool isCommon() const {
+    return !isUndefined() &&
+           !(st_shndx >= ELF::SHN_LORESERVE && st_shndx < ELF::SHN_ABS);
+  }
+  bool isDefined() const {
+    return !isUndefined() &&
+           (!(st_shndx >= ELF::SHN_LORESERVE &&
+              st_shndx <= ELF::SHN_HIRESERVE) ||
+            st_shndx == ELF::SHN_XINDEX);
+  }
+  bool isProcessorSpecific() const {
+    return st_shndx >= ELF::SHN_LOPROC && st_shndx <= ELF::SHN_HIPROC;
+  }
+  bool isOSSpecific() const {
+    return st_shndx >= ELF::SHN_LOOS && st_shndx <= ELF::SHN_HIOS;
+  }
+  bool isReserved() const {
+    return st_shndx > ELF::SHN_HIOS && st_shndx < ELF::SHN_ABS;
+  }
+  bool isUndefined() const { return st_shndx == ELF::SHN_UNDEF; }
 };
 
 /// Elf_Versym: This is the structure of entries in the SHT_GNU_versym section