From d99dafe2e4a385dd2a6c76da6d8258deb100657b Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Thu, 20 Apr 2017 21:19:10 +0000
Subject: Vendor import of llvm trunk r300890:
 https://llvm.org/svn/llvm-project/llvm/trunk@300890

---
 lib/CodeGen/MachineInstr.cpp | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

(limited to 'lib/CodeGen/MachineInstr.cpp')

diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index c0a8b95ed8a0..4bd5fbfe38e6 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -2351,3 +2351,31 @@ MachineInstrBuilder llvm::BuildMI(MachineBasicBlock &BB,
   BB.insert(I, MI);
   return MachineInstrBuilder(MF, MI);
 }
+
+MachineInstr *llvm::buildDbgValueForSpill(MachineBasicBlock &BB,
+                                          MachineBasicBlock::iterator I,
+                                          const MachineInstr &Orig,
+                                          int FrameIndex) {
+  const MDNode *Var = Orig.getDebugVariable();
+  auto *Expr = cast_or_null<DIExpression>(Orig.getDebugExpression());
+  bool IsIndirect = Orig.isIndirectDebugValue();
+  uint64_t Offset = IsIndirect ? Orig.getOperand(1).getImm() : 0;
+  DebugLoc DL = Orig.getDebugLoc();
+  assert(cast<DILocalVariable>(Var)->isValidLocationForIntrinsic(DL) &&
+         "Expected inlined-at fields to agree");
+  // If the DBG_VALUE already was a memory location, add an extra
+  // DW_OP_deref. Otherwise just turning this from a register into a
+  // memory/indirect location is sufficient.
+  if (IsIndirect) {
+    SmallVector<uint64_t, 8> Ops;
+    Ops.push_back(dwarf::DW_OP_deref);
+    if (Expr)
+      Ops.append(Expr->elements_begin(), Expr->elements_end());
+    Expr = DIExpression::get(Expr->getContext(), Ops);
+  }
+  return BuildMI(BB, I, DL, Orig.getDesc())
+      .addFrameIndex(FrameIndex)
+      .addImm(Offset)
+      .addMetadata(Var)
+      .addMetadata(Expr);
+}
-- 
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