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/Support/FormattedStream.h" 20 #include "llvm/Support/TargetRegistry.h" 21 #include "llvm/Target/TargetOptions.h" 22 using namespace llvm; 23 24 extern "C" void LLVMInitializeBPFTarget() { 25 // Register the target. 26 RegisterTargetMachine<BPFTargetMachine> X(TheBPFleTarget); 27 RegisterTargetMachine<BPFTargetMachine> Y(TheBPFbeTarget); 28 RegisterTargetMachine<BPFTargetMachine> Z(TheBPFTarget); 29 } 30 31 // DataLayout: little or big endian 32 static std::string computeDataLayout(const Triple &TT) { 33 if (TT.getArch() == Triple::bpfeb) 34 return "E-m:e-p:64:64-i64:64-n32:64-S128"; 35 else 36 return "e-m:e-p:64:64-i64:64-n32:64-S128"; 37 } 38 39 BPFTargetMachine::BPFTargetMachine(const Target &T, const Triple &TT, 40 StringRef CPU, StringRef FS, 41 const TargetOptions &Options, 42 Reloc::Model RM, CodeModel::Model CM, 43 CodeGenOpt::Level OL) 44 : LLVMTargetMachine(T, computeDataLayout(TT), TT, CPU, FS, Options, RM, CM, 45 OL), 46 TLOF(make_unique<TargetLoweringObjectFileELF>()), 47 Subtarget(TT, CPU, FS, *this) { 48 initAsmInfo(); 49 } 50 namespace { 51 // BPF Code Generator Pass Configuration Options. 52 class BPFPassConfig : public TargetPassConfig { 53 public: 54 BPFPassConfig(BPFTargetMachine *TM, PassManagerBase &PM) 55 : TargetPassConfig(TM, PM) {} 56 57 BPFTargetMachine &getBPFTargetMachine() const { 58 return getTM<BPFTargetMachine>(); 59 } 60 61 bool addInstSelector() override; 62 }; 63 } 64 65 TargetPassConfig *BPFTargetMachine::createPassConfig(PassManagerBase &PM) { 66 return new BPFPassConfig(this, PM); 67 } 68 69 // Install an instruction selector pass using 70 // the ISelDag to gen BPF code. 71 bool BPFPassConfig::addInstSelector() { 72 addPass(createBPFISelDag(getBPFTargetMachine())); 73 74 return false; 75 } 76
