Use unique_ptr to hold AsmInfo,MRI,MII,STI

[dblaikie]

include/llvm/Target/TargetMachine.h

87–91

Should these be unique_ptr<const T> like the original that was const T*?

lib/Target/TargetMachine.cpp

43

Could use = default here?

[MaskRay]

Incorporate review suggestions by dblaikie

[MaskRay]

lib/Target/TargetMachine.cpp

43

In my understanding about an out-of-line destructor, it does not matter if {} or = default is used, either will make the destructor non-trivial. But I agree with you in that = default; looks better.

[MaskRay]

Update reviewers line with arc diff --verbatim (see if this command works)

[dblaikie]

looks good - thanks!

(& yeah, for an out of line ctor, I don't think there's any difference in the codegen (or there shouldn't be) between = default and {}, but as you say, looks a bit better/makes it more explicit (to other readers and the compiler that there's nothing interesting going on, etc)

include/llvm/Target/TargetMachine.h

protected: // Can only create subclasses.
   std::string TargetCPU;
   std::string TargetFS;
 
   Reloc::Model RM = Reloc::Static;
   CodeModel::Model CMModel = CodeModel::Small;
   CodeGenOpt::Level OptLevel = CodeGenOpt::Default;
 
   /// Contains target specific asm information.
-  const MCAsmInfo *AsmInfo;
-
-  const MCRegisterInfo *MRI;
-  const MCInstrInfo *MII;
-  const MCSubtargetInfo *STI;
+  std::unique_ptr<const MCAsmInfo> AsmInfo;
+  std::unique_ptr<const MCRegisterInfo> MRI;
+  std::unique_ptr<const MCInstrInfo> MII;
+  std::unique_ptr<const MCSubtargetInfo> STI;
 
   unsigned RequireStructuredCFG : 1;
   unsigned O0WantsFastISel : 1;
 
 public:
   const TargetOptions DefaultOptions;
   mutable TargetOptions Options;
 
   TargetMachine(const TargetMachine &) = delete;
public:
   }
 
   /// Reset the target options based on the function's attributes.
   // FIXME: Remove TargetOptions that affect per-function code generation
   // from TargetMachine.
   void resetTargetOptions(const Function &F) const;
 
   /// Return target specific asm information.
-  const MCAsmInfo *getMCAsmInfo() const { return AsmInfo; }
+  const MCAsmInfo *getMCAsmInfo() const { return AsmInfo.get(); }
 
-  const MCRegisterInfo *getMCRegisterInfo() const { return MRI; }
-  const MCInstrInfo *getMCInstrInfo() const { return MII; }
-  const MCSubtargetInfo *getMCSubtargetInfo() const { return STI; }
+  const MCRegisterInfo *getMCRegisterInfo() const { return MRI.get(); }
+  const MCInstrInfo *getMCInstrInfo() const { return MII.get(); }
+  const MCSubtargetInfo *getMCSubtargetInfo() const { return STI.get(); }
 
   /// If intrinsic information is available, return it.  If not, return null.
   virtual const TargetIntrinsicInfo *getIntrinsicInfo() const {
     return nullptr;
   }
 
   bool requiresStructuredCFG() const { return RequireStructuredCFG; }
   void setRequiresStructuredCFG(bool Value) { RequireStructuredCFG = Value; }

lib/CodeGen/LLVMTargetMachine.cpp

 #include "llvm/Target/TargetOptions.h"
 using namespace llvm;
 
 static cl::opt<bool> EnableTrapUnreachable("trap-unreachable",
   cl::Hidden, cl::ZeroOrMore, cl::init(false),
   cl::desc("Enable generating trap for unreachable"));
 
 void LLVMTargetMachine::initAsmInfo() {
-  MRI = TheTarget.createMCRegInfo(getTargetTriple().str());
-  MII = TheTarget.createMCInstrInfo();
+  MRI.reset(TheTarget.createMCRegInfo(getTargetTriple().str()));
+  MII.reset(TheTarget.createMCInstrInfo());
   // FIXME: Having an MCSubtargetInfo on the target machine is a hack due
   // to some backends having subtarget feature dependent module level
   // code generation. This is similar to the hack in the AsmPrinter for
   // module level assembly etc.
-  STI = TheTarget.createMCSubtargetInfo(getTargetTriple().str(), getTargetCPU(),
-                                        getTargetFeatureString());
+  STI.reset(TheTarget.createMCSubtargetInfo(
+      getTargetTriple().str(), getTargetCPU(), getTargetFeatureString()));
 
   MCAsmInfo *TmpAsmInfo =
       TheTarget.createMCAsmInfo(*MRI, getTargetTriple().str());
   // TargetSelect.h moved to a different directory between LLVM 2.9 and 3.0,
   // and if the old one gets included then MCAsmInfo will be NULL and
   // we'll crash later.
   // Provide the user with a useful error message about what's wrong.
   assert(TmpAsmInfo && "MCAsmInfo not initialized. "
          "Make sure you include the correct TargetSelect.h"
          "and that InitializeAllTargetMCs() is being invoked!");
 
   if (Options.DisableIntegratedAS)
     TmpAsmInfo->setUseIntegratedAssembler(false);
 
   TmpAsmInfo->setPreserveAsmComments(Options.MCOptions.PreserveAsmComments);
 
   TmpAsmInfo->setCompressDebugSections(Options.CompressDebugSections);
 
   TmpAsmInfo->setRelaxELFRelocations(Options.RelaxELFRelocations);
 
   if (Options.ExceptionModel != ExceptionHandling::None)
     TmpAsmInfo->setExceptionsType(Options.ExceptionModel);
 
-  AsmInfo = TmpAsmInfo;
+  AsmInfo.reset(TmpAsmInfo);
 }
 
 LLVMTargetMachine::LLVMTargetMachine(const Target &T,
                                      StringRef DataLayoutString,
                                      const Triple &TT, StringRef CPU,
                                      StringRef FS, const TargetOptions &Options,
                                      Reloc::Model RM, CodeModel::Model CM,
                                      CodeGenOpt::Level OL)

lib/Target/BPF/BPFTargetMachine.cpp

BPFTargetMachine::BPFTargetMachine(const Target &T, const Triple &TT,
                                    CodeGenOpt::Level OL, bool JIT)
     : LLVMTargetMachine(T, computeDataLayout(TT), TT, CPU, FS, Options,
                         getEffectiveRelocModel(RM), getEffectiveCodeModel(CM),
                         OL),
       TLOF(make_unique<TargetLoweringObjectFileELF>()),
       Subtarget(TT, CPU, FS, *this) {
   initAsmInfo();
 
-  BPFMCAsmInfo *MAI = static_cast<BPFMCAsmInfo *>(const_cast<MCAsmInfo *>(AsmInfo));
+  BPFMCAsmInfo *MAI =
+      static_cast<BPFMCAsmInfo *>(const_cast<MCAsmInfo *>(AsmInfo.get()));
   MAI->setDwarfUsesRelocationsAcrossSections(!Subtarget.getUseDwarfRIS());
 }
 namespace {
 // BPF Code Generator Pass Configuration Options.
 class BPFPassConfig : public TargetPassConfig {
 public:
   BPFPassConfig(BPFTargetMachine &TM, PassManagerBase &PM)
       : TargetPassConfig(TM, PM) {}

lib/Target/TargetMachine.cpp

 TargetMachine::TargetMachine(const Target &T, StringRef DataLayoutString,
                              const Triple &TT, StringRef CPU, StringRef FS,
                              const TargetOptions &Options)
     : TheTarget(T), DL(DataLayoutString), TargetTriple(TT), TargetCPU(CPU),
       TargetFS(FS), AsmInfo(nullptr), MRI(nullptr), MII(nullptr), STI(nullptr),
       RequireStructuredCFG(false), DefaultOptions(Options), Options(Options) {
 }
 
-TargetMachine::~TargetMachine() {
-  delete AsmInfo;
-  delete MRI;
-  delete MII;
-  delete STI;
-}
+TargetMachine::~TargetMachine() = default;
 
 bool TargetMachine::isPositionIndependent() const {
   return getRelocationModel() == Reloc::PIC_;
 }
 
 /// Reset the target options based on the function's attributes.
 // FIXME: This function needs to go away for a number of reasons:
 // a) global state on the TargetMachine is terrible in general,