[RISCV] Basic Objdump Mapping Symbol Support (#151452)

This implements very basic support for RISC-V mapping symbols in
llvm-objdump, sharing the implementation with how Arm/AArch64/CSKY
implement this feature.

This only supports the `$x` (instruction) and `$d` (data) mapping
symbols for RISC-V, and not the version of `$x` which includes an
architecture string suffix.

1 files changed, 7 insertions, 1 deletions

diff --git a/llvm/tools/llvm-objdump/llvm-objdump.cpp b/llvm/tools/llvm-objdump/llvm-objdump.cpp
index c19c698..815759d 100644
--- a/llvm/tools/llvm-objdump/llvm-objdump.cpp
+++ b/llvm/tools/llvm-objdump/llvm-objdump.cpp
@@ -636,8 +636,14 @@ static bool isCSKYElf(const ObjectFile &Obj) {
   return Elf && Elf->getEMachine() == ELF::EM_CSKY;
 }
 
+static bool isRISCVElf(const ObjectFile &Obj) {
+  const auto *Elf = dyn_cast<ELFObjectFileBase>(&Obj);
+  return Elf && Elf->getEMachine() == ELF::EM_RISCV;
+}
+
 static bool hasMappingSymbols(const ObjectFile &Obj) {
-  return isArmElf(Obj) || isAArch64Elf(Obj) || isCSKYElf(Obj);
+  return isArmElf(Obj) || isAArch64Elf(Obj) || isCSKYElf(Obj) ||
+         isRISCVElf(Obj);
 }
 
 static void printRelocation(formatted_raw_ostream &OS, StringRef FileName,