1//===-- BPFTargetMachine.cpp - Define TargetMachine for BPF ---------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// Implements the info about BPF target spec. 11// 12//===----------------------------------------------------------------------===// 13 14#include "BPF.h" 15#include "BPFTargetMachine.h" 16#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h" 17#include "llvm/IR/LegacyPassManager.h" 18#include "llvm/CodeGen/Passes.h" 19#include "llvm/CodeGen/TargetPassConfig.h" 20#include "llvm/Support/FormattedStream.h" 21#include "llvm/Support/TargetRegistry.h" 22#include "llvm/Target/TargetOptions.h" 23using namespace llvm; 24 25extern "C" void LLVMInitializeBPFTarget() { 26 // Register the target. 27 RegisterTargetMachine<BPFTargetMachine> X(TheBPFleTarget); 28 RegisterTargetMachine<BPFTargetMachine> Y(TheBPFbeTarget); 29 RegisterTargetMachine<BPFTargetMachine> Z(TheBPFTarget); 30} 31 32// DataLayout: little or big endian 33static std::string computeDataLayout(const Triple &TT) { 34 if (TT.getArch() == Triple::bpfeb) 35 return "E-m:e-p:64:64-i64:64-n32:64-S128"; 36 else 37 return "e-m:e-p:64:64-i64:64-n32:64-S128"; 38} 39 40static Reloc::Model getEffectiveRelocModel(Optional<Reloc::Model> RM) { 41 if (!RM.hasValue()) 42 return Reloc::PIC_; 43 return *RM; 44} 45 46BPFTargetMachine::BPFTargetMachine(const Target &T, const Triple &TT, 47 StringRef CPU, StringRef FS, 48 const TargetOptions &Options, 49 Optional<Reloc::Model> RM, 50 CodeModel::Model CM, CodeGenOpt::Level OL) 51 : LLVMTargetMachine(T, computeDataLayout(TT), TT, CPU, FS, Options, 52 getEffectiveRelocModel(RM), CM, OL), 53 TLOF(make_unique<TargetLoweringObjectFileELF>()), 54 Subtarget(TT, CPU, FS, *this) { 55 initAsmInfo(); 56} 57namespace { 58// BPF Code Generator Pass Configuration Options. 59class BPFPassConfig : public TargetPassConfig { 60public: 61 BPFPassConfig(BPFTargetMachine *TM, PassManagerBase &PM) 62 : TargetPassConfig(TM, PM) {} 63 64 BPFTargetMachine &getBPFTargetMachine() const { 65 return getTM<BPFTargetMachine>(); 66 } 67 68 bool addInstSelector() override; 69}; 70} 71 72TargetPassConfig *BPFTargetMachine::createPassConfig(PassManagerBase &PM) { 73 return new BPFPassConfig(this, PM); 74} 75 76// Install an instruction selector pass using 77// the ISelDag to gen BPF code. 78bool BPFPassConfig::addInstSelector() { 79 addPass(createBPFISelDag(getBPFTargetMachine())); 80 81 return false; 82} 83