1 //===-- BPFSubtarget.cpp - BPF Subtarget Information ----------------------===// 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 // This file implements the BPF specific subclass of TargetSubtargetInfo. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "BPFSubtarget.h" 14 #include "BPF.h" 15 #include "llvm/MC/TargetRegistry.h" 16 #include "llvm/Support/Host.h" 17 18 using namespace llvm; 19 20 #define DEBUG_TYPE "bpf-subtarget" 21 22 #define GET_SUBTARGETINFO_TARGET_DESC 23 #define GET_SUBTARGETINFO_CTOR 24 #include "BPFGenSubtargetInfo.inc" 25 26 void BPFSubtarget::anchor() {} 27 28 BPFSubtarget &BPFSubtarget::initializeSubtargetDependencies(StringRef CPU, 29 StringRef FS) { 30 initializeEnvironment(); 31 initSubtargetFeatures(CPU, FS); 32 ParseSubtargetFeatures(CPU, /*TuneCPU*/ CPU, FS); 33 return *this; 34 } 35 36 void BPFSubtarget::initializeEnvironment() { 37 HasJmpExt = false; 38 HasJmp32 = false; 39 HasAlu32 = false; 40 UseDwarfRIS = false; 41 } 42 43 void BPFSubtarget::initSubtargetFeatures(StringRef CPU, StringRef FS) { 44 if (CPU == "probe") 45 CPU = sys::detail::getHostCPUNameForBPF(); 46 if (CPU == "generic" || CPU == "v1") 47 return; 48 if (CPU == "v2") { 49 HasJmpExt = true; 50 return; 51 } 52 if (CPU == "v3") { 53 HasJmpExt = true; 54 HasJmp32 = true; 55 HasAlu32 = true; 56 return; 57 } 58 } 59 60 BPFSubtarget::BPFSubtarget(const Triple &TT, const std::string &CPU, 61 const std::string &FS, const TargetMachine &TM) 62 : BPFGenSubtargetInfo(TT, CPU, /*TuneCPU*/ CPU, FS), 63 FrameLowering(initializeSubtargetDependencies(CPU, FS)), 64 TLInfo(TM, *this) {} 65