1 files changed, 89 insertions, 0 deletions
diff --git a/lib/Target/BPF/BPFISelLowering.h b/lib/Target/BPF/BPFISelLowering.h
new file mode 100644
index 0000000..04d7908
--- /dev/null
+++ b/lib/Target/BPF/BPFISelLowering.h
@@ -0,0 +1,89 @@
+//===-- BPFISelLowering.h - BPF DAG Lowering Interface ----------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the interfaces that BPF uses to lower LLVM code into a
+// selection DAG.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_BPF_BPFISELLOWERING_H
+#define LLVM_LIB_TARGET_BPF_BPFISELLOWERING_H
+
+#include "BPF.h"
+#include "llvm/CodeGen/SelectionDAG.h"
+#include "llvm/Target/TargetLowering.h"
+
+namespace llvm {
+namespace BPFISD {
+enum {
+  FIRST_NUMBER = ISD::BUILTIN_OP_END,
+  RET_FLAG,
+  CALL,
+  SELECT_CC,
+  BR_CC,
+  Wrapper
+};
+}
+
+class BPFTargetLowering : public TargetLowering {
+public:
+  explicit BPFTargetLowering(const TargetMachine &TM, const BPFSubtarget &STI);
+
+  // Provide custom lowering hooks for some operations.
+  SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
+
+  // This method returns the name of a target specific DAG node.
+  const char *getTargetNodeName(unsigned Opcode) const override;
+
+  MachineBasicBlock *
+  EmitInstrWithCustomInserter(MachineInstr *MI,
+                              MachineBasicBlock *BB) const override;
+
+private:
+  SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG) const;
+  SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
+  SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
+
+  // Lower the result values of a call, copying them out of physregs into vregs
+  SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
+                          CallingConv::ID CallConv, bool IsVarArg,
+                          const SmallVectorImpl<ISD::InputArg> &Ins, SDLoc DL,
+                          SelectionDAG &DAG,
+                          SmallVectorImpl<SDValue> &InVals) const;
+
+  // Lower a call into CALLSEQ_START - BPFISD:CALL - CALLSEQ_END chain
+  SDValue LowerCall(TargetLowering::CallLoweringInfo &CLI,
+                    SmallVectorImpl<SDValue> &InVals) const override;
+
+  // Lower incoming arguments, copy physregs into vregs
+  SDValue LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv,
+                               bool IsVarArg,
+                               const SmallVectorImpl<ISD::InputArg> &Ins,
+                               SDLoc DL, SelectionDAG &DAG,
+                               SmallVectorImpl<SDValue> &InVals) const override;
+
+  SDValue LowerReturn(SDValue Chain, CallingConv::ID CallConv, bool IsVarArg,
+                      const SmallVectorImpl<ISD::OutputArg> &Outs,
+                      const SmallVectorImpl<SDValue> &OutVals, SDLoc DL,
+                      SelectionDAG &DAG) const override;
+
+  EVT getOptimalMemOpType(uint64_t Size, unsigned DstAlign, unsigned SrcAlign,
+                          bool IsMemset, bool ZeroMemset, bool MemcpyStrSrc,
+                          MachineFunction &MF) const override {
+    return Size >= 8 ? MVT::i64 : MVT::i32;
+  }
+
+  bool shouldConvertConstantLoadToIntImm(const APInt &Imm,
+                                         Type *Ty) const override {
+    return true;
+  }
+};
+}
+
+#endif