[COFF, ARM64] Add support for Windows ARM64 COFF format

Summary:
This is the llvm part of the initial implementation to support Windows ARM64 COFF format.
I will gradually add more functionality in subsequent patches.

Reviewers: ruiu, rnk, t.p.northover, compnerd

Reviewed By: ruiu, compnerd

Subscribers: aemerson, mgorny, javed.absar, llvm-commits, kristof.beyls

Differential Revision: https://reviews.llvm.org/D34705

llvm-svn: 306490

1 files changed, 13 insertions, 1 deletions

diff --git a/llvm/lib/Target/AArch64/AArch64MCInstLower.cpp b/llvm/lib/Target/AArch64/AArch64MCInstLower.cpp
index 45083df7ab4..2bdc0539fb1 100644
--- a/llvm/lib/Target/AArch64/AArch64MCInstLower.cpp
+++ b/llvm/lib/Target/AArch64/AArch64MCInstLower.cpp
@@ -151,13 +151,25 @@ MCOperand AArch64MCInstLower::lowerSymbolOperandELF(const MachineOperand &MO,
   return MCOperand::createExpr(Expr);
 }
 
+MCOperand AArch64MCInstLower::lowerSymbolOperandCOFF(const MachineOperand &MO,
+                                                     MCSymbol *Sym) const {
+  MCSymbolRefExpr::VariantKind RefKind = MCSymbolRefExpr::VK_None;
+  const MCExpr *Expr = MCSymbolRefExpr::create(Sym, RefKind, Ctx);
+  if (!MO.isJTI() && MO.getOffset())
+    Expr = MCBinaryExpr::createAdd(
+        Expr, MCConstantExpr::create(MO.getOffset(), Ctx), Ctx);
+  return MCOperand::createExpr(Expr);
+}
+
 MCOperand AArch64MCInstLower::LowerSymbolOperand(const MachineOperand &MO,
                                                  MCSymbol *Sym) const {
   if (Printer.TM.getTargetTriple().isOSDarwin())
     return lowerSymbolOperandDarwin(MO, Sym);
+  if (Printer.TM.getTargetTriple().isOSBinFormatCOFF())
+    return lowerSymbolOperandCOFF(MO, Sym);
 
   assert(Printer.TM.getTargetTriple().isOSBinFormatELF() &&
-         "Expect Darwin or ELF target");
+         "Expect Darwin, ELF or COFF target");
   return lowerSymbolOperandELF(MO, Sym);
 }