1 files changed, 53 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index e1396649f34..8a762555577 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -48,6 +48,7 @@
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Module.h"
 #include "llvm/IR/Statepoint.h"
+#include "llvm/MC/MCSymbol.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/ErrorHandling.h"
@@ -5581,6 +5582,58 @@ SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I, unsigned Intrinsic) {
   }
   case Intrinsic::instrprof_increment:
     llvm_unreachable("instrprof failed to lower an increment");
+
+  case Intrinsic::frameallocate: {
+    MachineFunction &MF = DAG.getMachineFunction();
+    const TargetInstrInfo *TII = DAG.getSubtarget().getInstrInfo();
+
+    // Do the allocation and map it as a normal value.
+    // FIXME: Maybe we should add this to the alloca map so that we don't have
+    // to register allocate it?
+    uint64_t Size = cast<ConstantInt>(I.getArgOperand(0))->getZExtValue();
+    int Alloc = MF.getFrameInfo()->CreateFrameAllocation(Size);
+    MVT PtrVT = TLI.getPointerTy(0);
+    SDValue FIVal = DAG.getFrameIndex(Alloc, PtrVT);
+    setValue(&I, FIVal);
+
+    // Directly emit a FRAME_ALLOC machine instr. Label assignment emission is
+    // the same on all targets.
+    MCSymbol *FrameAllocSym =
+        MF.getMMI().getContext().getOrCreateFrameAllocSymbol(MF.getName());
+    BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, dl,
+            TII->get(TargetOpcode::FRAME_ALLOC))
+        .addSym(FrameAllocSym)
+        .addFrameIndex(Alloc);
+
+    return nullptr;
+  }
+
+  case Intrinsic::recoverframeallocation: {
+    // i8* @llvm.recoverframeallocation(i8* %fn, i8* %fp)
+    MachineFunction &MF = DAG.getMachineFunction();
+    MVT PtrVT = TLI.getPointerTy(0);
+
+    // Get the symbol that defines the frame offset.
+    Function *Fn = cast<Function>(I.getArgOperand(0)->stripPointerCasts());
+    MCSymbol *FrameAllocSym =
+        MF.getMMI().getContext().getOrCreateFrameAllocSymbol(Fn->getName());
+
+    // Create a TargetExternalSymbol for the label to avoid any target lowering
+    // that would make this PC relative.
+    StringRef Name = FrameAllocSym->getName();
+    assert(Name.size() == strlen(Name.data()) && "not null terminated");
+    SDValue OffsetSym = DAG.getTargetExternalSymbol(Name.data(), PtrVT);
+    SDValue OffsetVal =
+        DAG.getNode(ISD::RECOVER_FRAME_ALLOC, sdl, PtrVT, OffsetSym);
+
+    // Add the offset to the FP.
+    Value *FP = I.getArgOperand(1);
+    SDValue FPVal = getValue(FP);
+    SDValue Add = DAG.getNode(ISD::ADD, sdl, PtrVT, FPVal, OffsetVal);
+    setValue(&I, Add);
+
+    return nullptr;
+  }
   }
 }