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//===-- 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
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