1 //===-- BPFCallLowering.cpp - Call lowering for GlobalISel ------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 /// 9 /// \file 10 /// This file implements the lowering of LLVM calls to machine code calls for 11 /// GlobalISel. 12 /// 13 //===----------------------------------------------------------------------===// 14 15 #include "BPFCallLowering.h" 16 #include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h" 17 #include "llvm/Support/Debug.h" 18 19 #define DEBUG_TYPE "bpf-call-lowering" 20 21 using namespace llvm; 22 23 BPFCallLowering::BPFCallLowering(const BPFTargetLowering &TLI) 24 : CallLowering(&TLI) {} 25 26 bool BPFCallLowering::lowerReturn(MachineIRBuilder &MIRBuilder, 27 const Value *Val, ArrayRef<Register> VRegs, 28 FunctionLoweringInfo &FLI, 29 Register SwiftErrorVReg) const { 30 if (!VRegs.empty()) 31 return false; 32 MIRBuilder.buildInstr(BPF::RET); 33 return true; 34 } 35 36 bool BPFCallLowering::lowerFormalArguments(MachineIRBuilder &MIRBuilder, 37 const Function &F, 38 ArrayRef<ArrayRef<Register>> VRegs, 39 FunctionLoweringInfo &FLI) const { 40 return VRegs.empty(); 41 } 42 43 bool BPFCallLowering::lowerCall(MachineIRBuilder &MIRBuilder, 44 CallLoweringInfo &Info) const { 45 return false; 46 } 47