Add printer for ADR operands.

The ADR immediate operand is PC relative. But it misses its own printing function
(in comparision to ADRP for example). If during disassembly the immediate was not resolved
to a symbol (which is always the case for CS and llvm-objdump) the immediate is printed as is.
Although it should print Address + Imm.

This case should now be handled in printAdrLabel()

Author: Rot127

llvm/lib/Target/AArch64/AArch64InstrFormats.td

@@ -297,7 +297,9 @@ def AdrOperand : AsmOperandClass {
 }
 def adrlabel : Operand<i64> {
   let EncoderMethod = "getAdrLabelOpValue";
+  let PrintMethod = "printAdrLabel";
   let ParserMatchClass = AdrOperand;
+  let OperandType = "OPERAND_PCREL";
 }
 
 class SImmOperand<int width> : AsmOperandClass {

llvm/lib/Target/AArch64/MCTargetDesc/AArch64InstPrinter.cpp

@@ -1773,6 +1773,29 @@ void AArch64InstPrinter::printAlignedLabel(const MCInst *MI, uint64_t Address,
   }
 }
 
+void AArch64InstPrinter::printAdrLabel(const MCInst *MI, uint64_t Address,
+                                        unsigned OpNum,
+                                        const MCSubtargetInfo &STI,
+                                        raw_ostream &O) {
+  const MCOperand &Op = MI->getOperand(OpNum);
+
+  // If the label has already been resolved to an immediate offset (say, when
+  // we're running the disassembler), just print the immediate.
+  if (Op.isImm()) {
+    const int64_t Offset = Op.getImm();
+    O << markup("<imm:");
+    if (PrintBranchImmAsAddress)
+      O << formatHex((Address & -4096) + Offset);
+    else
+      O << "#" << Offset;
+    O << markup(">");
+    return;
+  }
+
+  // Otherwise, just print the expression.
+  MI->getOperand(OpNum).getExpr()->print(O, &MAI);
+}
+
 void AArch64InstPrinter::printAdrpLabel(const MCInst *MI, uint64_t Address,
                                         unsigned OpNum,
                                         const MCSubtargetInfo &STI,

llvm/lib/Target/AArch64/MCTargetDesc/AArch64InstPrinter.h

@@ -174,6 +174,8 @@ class AArch64InstPrinter : public MCInstPrinter {
                         const MCSubtargetInfo &STI, raw_ostream &O);
   void printMatrixIndex(const MCInst *MI, unsigned OpNum,
                         const MCSubtargetInfo &STI, raw_ostream &O);
+  void printAdrLabel(const MCInst *MI, uint64_t Address, unsigned OpNum,
+                      const MCSubtargetInfo &STI, raw_ostream &O);
   void printAdrpLabel(const MCInst *MI, uint64_t Address, unsigned OpNum,
                       const MCSubtargetInfo &STI, raw_ostream &O);
   void printBarrierOption(const MCInst *MI, unsigned OpNum,