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      1 //===-- AArch64TargetMachine.cpp - Define TargetMachine for AArch64 -------===//
      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 // This file contains the implementation of the AArch64TargetMachine
     11 // methods. Principally just setting up the passes needed to generate correct
     12 // code on this architecture.
     13 //
     14 //===----------------------------------------------------------------------===//
     15 
     16 #include "AArch64.h"
     17 #include "AArch64TargetMachine.h"
     18 #include "MCTargetDesc/AArch64MCTargetDesc.h"
     19 #include "llvm/PassManager.h"
     20 #include "llvm/CodeGen/Passes.h"
     21 #include "llvm/Support/TargetRegistry.h"
     22 
     23 using namespace llvm;
     24 
     25 extern "C" void LLVMInitializeAArch64Target() {
     26   RegisterTargetMachine<AArch64TargetMachine> X(TheAArch64Target);
     27 }
     28 
     29 AArch64TargetMachine::AArch64TargetMachine(const Target &T, StringRef TT,
     30                                            StringRef CPU, StringRef FS,
     31                                            const TargetOptions &Options,
     32                                            Reloc::Model RM, CodeModel::Model CM,
     33                                            CodeGenOpt::Level OL)
     34   : LLVMTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL),
     35     Subtarget(TT, CPU, FS),
     36     InstrInfo(Subtarget),
     37     DL("e-p:64:64-i64:64:64-i128:128:128-s0:32:32-f128:128:128-n32:64-S128"),
     38     TLInfo(*this),
     39     TSInfo(*this),
     40     FrameLowering(Subtarget) {
     41 }
     42 
     43 namespace {
     44 /// AArch64 Code Generator Pass Configuration Options.
     45 class AArch64PassConfig : public TargetPassConfig {
     46 public:
     47   AArch64PassConfig(AArch64TargetMachine *TM, PassManagerBase &PM)
     48     : TargetPassConfig(TM, PM) {}
     49 
     50   AArch64TargetMachine &getAArch64TargetMachine() const {
     51     return getTM<AArch64TargetMachine>();
     52   }
     53 
     54   const AArch64Subtarget &getAArch64Subtarget() const {
     55     return *getAArch64TargetMachine().getSubtargetImpl();
     56   }
     57 
     58   virtual bool addInstSelector();
     59   virtual bool addPreEmitPass();
     60 };
     61 } // namespace
     62 
     63 TargetPassConfig *AArch64TargetMachine::createPassConfig(PassManagerBase &PM) {
     64   return new AArch64PassConfig(this, PM);
     65 }
     66 
     67 bool AArch64PassConfig::addPreEmitPass() {
     68   addPass(&UnpackMachineBundlesID);
     69   addPass(createAArch64BranchFixupPass());
     70   return true;
     71 }
     72 
     73 bool AArch64PassConfig::addInstSelector() {
     74   addPass(createAArch64ISelDAG(getAArch64TargetMachine(), getOptLevel()));
     75 
     76   // For ELF, cleanup any local-dynamic TLS accesses.
     77   if (getAArch64Subtarget().isTargetELF() && getOptLevel() != CodeGenOpt::None)
     78     addPass(createAArch64CleanupLocalDynamicTLSPass());
     79 
     80   return false;
     81 }
     82