Add CLANG_DEFAULT_OBJCOPY to allow Clang to use llvm-objcopy for dwarf fission

llvm-objcopy is getting to where it can be used in non-trivial ways
(such as for dwarf fission in clang). It now supports dwarf fission but
this feature hasn't been thoroughly tested yet. This change allows
people to optionally build clang to use llvm-objcopy rather than GNU
objcopy. By default GNU objcopy is still used so nothing should change.

Differential Revision: https://reviews.llvm.org/D39029

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@317960 91177308-0d34-0410-b5e6-96231b3b80d8

5 files changed, 51 insertions, 44 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 563b33eae2..b5a245d038 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -232,6 +232,9 @@ if (NOT(CLANG_DEFAULT_RTLIB STREQUAL "" OR
     "Default runtime library to use (\"libgcc\" or \"compiler-rt\", empty for platform default)" FORCE)
 endif()
 
+set(CLANG_DEFAULT_OBJCOPY "objcopy" CACHE STRING
+  "Default objcopy executable to use.")
+
 set(CLANG_DEFAULT_OPENMP_RUNTIME "libomp" CACHE STRING
   "Default OpenMP runtime used by -fopenmp.")
 
@@ -534,8 +537,8 @@ if (CLANG_ENABLE_BOOTSTRAP)
     set(NEXT_CLANG_STAGE ${NEXT_CLANG_STAGE}-instrumented)
   endif()
   message(STATUS "Setting next clang stage to: ${NEXT_CLANG_STAGE}")
-  
-  
+
+
   set(STAMP_DIR ${CMAKE_CURRENT_BINARY_DIR}/${NEXT_CLANG_STAGE}-stamps/)
   set(BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR}/${NEXT_CLANG_STAGE}-bins/)
 
diff --git a/include/clang/Config/config.h.cmake b/include/clang/Config/config.h.cmake
index 10074aafd8..daac9b7b45 100644
--- a/include/clang/Config/config.h.cmake
+++ b/include/clang/Config/config.h.cmake
@@ -17,6 +17,9 @@
 /* Default runtime library to use. */
 #define CLANG_DEFAULT_RTLIB "${CLANG_DEFAULT_RTLIB}"
 
+/* Default objcopy to use */
+#define CLANG_DEFAULT_OBJCOPY "${CLANG_DEFAULT_OBJCOPY}"
+
 /* Default OpenMP runtime used by -fopenmp. */
 #define CLANG_DEFAULT_OPENMP_RUNTIME "${CLANG_DEFAULT_OPENMP_RUNTIME}"
 
diff --git a/lib/CodeGen/CodeGenModule.cpp b/lib/CodeGen/CodeGenModule.cpp
index 61a1ed2393..8d29022b96 100644
--- a/lib/CodeGen/CodeGenModule.cpp
+++ b/lib/CodeGen/CodeGenModule.cpp
@@ -441,7 +441,7 @@ void CodeGenModule::Release() {
   if (Context.getTargetInfo().getTriple().getArch() == llvm::Triple::x86)
     getModule().addModuleFlag(llvm::Module::Error, "NumRegisterParameters",
                               CodeGenOpts.NumRegisterParameters);
-  
+
   if (CodeGenOpts.DwarfVersion) {
     // We actually want the latest version when there are conflicts.
     // We can change from Warning to Latest if such mode is supported.
@@ -770,7 +770,7 @@ StringRef CodeGenModule::getBlockMangledName(GlobalDecl GD,
   SmallString<256> Buffer;
   llvm::raw_svector_ostream Out(Buffer);
   if (!D)
-    MangleCtx.mangleGlobalBlock(BD, 
+    MangleCtx.mangleGlobalBlock(BD,
       dyn_cast_or_null<VarDecl>(initializedGlobalDecl.getDecl()), Out);
   else if (const auto *CD = dyn_cast<CXXConstructorDecl>(D))
     MangleCtx.mangleCtorBlock(CD, GD.getCtorType(), BD, Out);
@@ -2010,12 +2010,12 @@ bool CodeGenModule::shouldOpportunisticallyEmitVTables() {
 void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD, llvm::GlobalValue *GV) {
   const auto *D = cast<ValueDecl>(GD.getDecl());
 
-  PrettyStackTraceDecl CrashInfo(const_cast<ValueDecl *>(D), D->getLocation(), 
+  PrettyStackTraceDecl CrashInfo(const_cast<ValueDecl *>(D), D->getLocation(),
                                  Context.getSourceManager(),
                                  "Generating code for declaration");
-  
+
   if (isa<FunctionDecl>(D)) {
-    // At -O0, don't generate IR for functions with available_externally 
+    // At -O0, don't generate IR for functions with available_externally
     // linkage.
     if (!shouldEmitFunction(GD))
       return;
@@ -2041,7 +2041,7 @@ void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD, llvm::GlobalValue *GV) {
 
   if (const auto *VD = dyn_cast<VarDecl>(D))
     return EmitGlobalVarDefinition(VD, !VD->hasDefinition());
-  
+
   llvm_unreachable("Invalid argument to EmitGlobalDefinition()");
 }
 
@@ -2547,7 +2547,7 @@ CodeGenModule::GetAddrOfGlobal(GlobalDecl GD,
 }
 
 llvm::GlobalVariable *
-CodeGenModule::CreateOrReplaceCXXRuntimeVariable(StringRef Name, 
+CodeGenModule::CreateOrReplaceCXXRuntimeVariable(StringRef Name,
                                       llvm::Type *Ty,
                                       llvm::GlobalValue::LinkageTypes Linkage) {
   llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name);
@@ -2563,7 +2563,7 @@ CodeGenModule::CreateOrReplaceCXXRuntimeVariable(StringRef Name,
     assert(GV->isDeclaration() && "Declaration has wrong type!");
     OldGV = GV;
   }
-  
+
   // Create a new variable.
   GV = new llvm::GlobalVariable(getModule(), Ty, /*isConstant=*/true,
                                 Linkage, nullptr, Name);
@@ -2571,13 +2571,13 @@ CodeGenModule::CreateOrReplaceCXXRuntimeVariable(StringRef Name,
   if (OldGV) {
     // Replace occurrences of the old variable if needed.
     GV->takeName(OldGV);
-    
+
     if (!OldGV->use_empty()) {
       llvm::Constant *NewPtrForOldDecl =
       llvm::ConstantExpr::getBitCast(GV, OldGV->getType());
       OldGV->replaceAllUsesWith(NewPtrForOldDecl);
     }
-    
+
     OldGV->eraseFromParent();
   }
 
@@ -3582,7 +3582,7 @@ QualType CodeGenModule::getObjCFastEnumerationStateType() {
   if (ObjCFastEnumerationStateType.isNull()) {
     RecordDecl *D = Context.buildImplicitRecord("__objcFastEnumerationState");
     D->startDefinition();
-    
+
     QualType FieldTypes[] = {
       Context.UnsignedLongTy,
       Context.getPointerType(Context.getObjCIdType()),
@@ -3590,7 +3590,7 @@ QualType CodeGenModule::getObjCFastEnumerationStateType() {
       Context.getConstantArrayType(Context.UnsignedLongTy,
                            llvm::APInt(32, 5), ArrayType::Normal, 0)
     };
-    
+
     for (size_t i = 0; i < 4; ++i) {
       FieldDecl *Field = FieldDecl::Create(Context,
                                            D,
@@ -3603,18 +3603,18 @@ QualType CodeGenModule::getObjCFastEnumerationStateType() {
       Field->setAccess(AS_public);
       D->addDecl(Field);
     }
-    
+
     D->completeDefinition();
     ObjCFastEnumerationStateType = Context.getTagDeclType(D);
   }
-  
+
   return ObjCFastEnumerationStateType;
 }
 
 llvm::Constant *
 CodeGenModule::GetConstantArrayFromStringLiteral(const StringLiteral *E) {
   assert(!E->getType()->isPointerType() && "Strings are always arrays");
-  
+
   // Don't emit it as the address of the string, emit the string data itself
   // as an inline array.
   if (E->getCharByteWidth() == 1) {
@@ -3640,11 +3640,11 @@ CodeGenModule::GetConstantArrayFromStringLiteral(const StringLiteral *E) {
     Elements.resize(NumElements);
     return llvm::ConstantDataArray::get(VMContext, Elements);
   }
-  
+
   assert(ElemTy->getPrimitiveSizeInBits() == 32);
   SmallVector<uint32_t, 32> Elements;
   Elements.reserve(NumElements);
-  
+
   for(unsigned i = 0, e = E->getLength(); i != e; ++i)
     Elements.push_back(E->getCodeUnit(i));
   Elements.resize(NumElements);
@@ -3936,11 +3936,11 @@ void CodeGenModule::EmitObjCIvarInitializations(ObjCImplementationDecl *D) {
   if (D->getNumIvarInitializers() == 0 ||
       AllTrivialInitializers(*this, D))
     return;
-  
+
   IdentifierInfo *II = &getContext().Idents.get(".cxx_construct");
   Selector cxxSelector = getContext().Selectors.getSelector(0, &II);
   // The constructor returns 'self'.
-  ObjCMethodDecl *CTORMethod = ObjCMethodDecl::Create(getContext(), 
+  ObjCMethodDecl *CTORMethod = ObjCMethodDecl::Create(getContext(),
                                                 D->getLocation(),
                                                 D->getLocation(),
                                                 cxxSelector,
@@ -4076,7 +4076,7 @@ void CodeGenModule::EmitTopLevelDecl(Decl *D) {
     if (cast<FunctionDecl>(D)->getDescribedFunctionTemplate() ||
         cast<FunctionDecl>(D)->isLateTemplateParsed())
       return;
-      
+
     getCXXABI().EmitCXXConstructors(cast<CXXConstructorDecl>(D));
     break;
   case Decl::CXXDestructor:
@@ -4102,7 +4102,7 @@ void CodeGenModule::EmitTopLevelDecl(Decl *D) {
       ObjCRuntime->GenerateProtocol(Proto);
     break;
   }
-      
+
   case Decl::ObjCCategoryImpl:
     // Categories have properties but don't support synthesize so we
     // can ignore them here.
@@ -4501,7 +4501,7 @@ llvm::Constant *CodeGenModule::GetAddrOfRTTIDescriptor(QualType Ty,
   // and it's not for EH?
   if (!ForEH && !getLangOpts().RTTI)
     return llvm::Constant::getNullValue(Int8PtrTy);
-  
+
   if (ForEH && Ty->isObjCObjectPointerType() &&
       LangOpts.ObjCRuntime.isGNUFamily())
     return ObjCRuntime->GetEHType(Ty);
diff --git a/lib/CodeGen/ItaniumCXXABI.cpp b/lib/CodeGen/ItaniumCXXABI.cpp
index 173bc4d8df..a2d303e954 100644
--- a/lib/CodeGen/ItaniumCXXABI.cpp
+++ b/lib/CodeGen/ItaniumCXXABI.cpp
@@ -562,9 +562,9 @@ CGCallee ItaniumCXXABI::EmitLoadOfMemberFunctionPointer(
     llvm::Value *MemFnPtr, const MemberPointerType *MPT) {
   CGBuilderTy &Builder = CGF.Builder;
 
-  const FunctionProtoType *FPT = 
+  const FunctionProtoType *FPT =
     MPT->getPointeeType()->getAs<FunctionProtoType>();
-  const CXXRecordDecl *RD = 
+  const CXXRecordDecl *RD =
     cast<CXXRecordDecl>(MPT->getClass()->getAs<RecordType>()->getDecl());
 
   llvm::FunctionType *FTy = CGM.getTypes().GetFunctionType(
@@ -591,10 +591,10 @@ CGCallee ItaniumCXXABI::EmitLoadOfMemberFunctionPointer(
   Ptr = Builder.CreateInBoundsGEP(Ptr, Adj);
   This = Builder.CreateBitCast(Ptr, This->getType(), "this.adjusted");
   ThisPtrForCall = This;
-  
+
   // Load the function pointer.
   llvm::Value *FnAsInt = Builder.CreateExtractValue(MemFnPtr, 0, "memptr.ptr");
-  
+
   // If the LSB in the function pointer is 1, the function pointer points to
   // a virtual function.
   llvm::Value *IsVirtual;
@@ -642,7 +642,7 @@ CGCallee ItaniumCXXABI::EmitLoadOfMemberFunctionPointer(
   CGF.EmitBlock(FnNonVirtual);
   llvm::Value *NonVirtualFn =
     Builder.CreateIntToPtr(FnAsInt, FTy->getPointerTo(), "memptr.nonvirtualfn");
-  
+
   // We're done.
   CGF.EmitBlock(FnEnd);
   llvm::PHINode *CalleePtr = Builder.CreatePHI(FTy->getPointerTo(), 2);
@@ -807,7 +807,7 @@ llvm::Constant *
 ItaniumCXXABI::EmitNullMemberPointer(const MemberPointerType *MPT) {
   // Itanium C++ ABI 2.3:
   //   A NULL pointer is represented as -1.
-  if (MPT->isMemberDataPointer()) 
+  if (MPT->isMemberDataPointer())
     return llvm::ConstantInt::get(CGM.PtrDiffTy, -1ULL, /*isSigned=*/true);
 
   llvm::Constant *Zero = llvm::ConstantInt::get(CGM.PtrDiffTy, 0);
@@ -884,7 +884,7 @@ llvm::Constant *ItaniumCXXABI::BuildMemberPointer(const CXXMethodDecl *MD,
                                        (UseARMMethodPtrABI ? 2 : 1) *
                                        ThisAdjustment.getQuantity());
   }
-  
+
   return llvm::ConstantStruct::getAnon(MemPtr);
 }
 
@@ -943,7 +943,7 @@ ItaniumCXXABI::EmitMemberPointerComparison(CodeGenFunction &CGF,
   //                   (L.ptr == 0 && ((L.adj|R.adj) & 1) == 0)))
   // The inequality tautologies have exactly the same structure, except
   // applying De Morgan's laws.
-  
+
   llvm::Value *LPtr = Builder.CreateExtractValue(L, 0, "lhs.memptr.ptr");
   llvm::Value *RPtr = Builder.CreateExtractValue(R, 0, "rhs.memptr.ptr");
 
@@ -996,7 +996,7 @@ ItaniumCXXABI::EmitMemberPointerIsNotNull(CodeGenFunction &CGF,
       llvm::Constant::getAllOnesValue(MemPtr->getType());
     return Builder.CreateICmpNE(MemPtr, NegativeOne, "memptr.tobool");
   }
-  
+
   // In Itanium, a member function pointer is not null if 'ptr' is not null.
   llvm::Value *Ptr = Builder.CreateExtractValue(MemPtr, 0, "memptr.ptr");
 
@@ -1154,9 +1154,9 @@ static llvm::Constant *getItaniumDynamicCastFn(CodeGenFunction &CGF) {
   //                      const abi::__class_type_info *src,
   //                      const abi::__class_type_info *dst,
   //                      std::ptrdiff_t src2dst_offset);
-  
+
   llvm::Type *Int8PtrTy = CGF.Int8PtrTy;
-  llvm::Type *PtrDiffTy = 
+  llvm::Type *PtrDiffTy =
     CGF.ConvertType(CGF.getContext().getPointerDiffType());
 
   llvm::Type *Args[4] = { Int8PtrTy, Int8PtrTy, Int8PtrTy, PtrDiffTy };
@@ -2139,19 +2139,19 @@ void ItaniumCXXABI::EmitGuardedInit(CodeGenFunction &CGF,
   CGF.EmitBlock(InitCheckBlock);
 
   // Variables used when coping with thread-safe statics and exceptions.
-  if (threadsafe) {    
+  if (threadsafe) {
     // Call __cxa_guard_acquire.
     llvm::Value *V
       = CGF.EmitNounwindRuntimeCall(getGuardAcquireFn(CGM, guardPtrTy), guard);
-               
+
     llvm::BasicBlock *InitBlock = CGF.createBasicBlock("init");
-  
+
     Builder.CreateCondBr(Builder.CreateIsNotNull(V, "tobool"),
                          InitBlock, EndBlock);
-  
+
     // Call __cxa_guard_abort along the exceptional edge.
     CGF.EHStack.pushCleanup<CallGuardAbort>(EHCleanup, guard);
-    
+
     CGF.EmitBlock(InitBlock);
   }
 
@@ -2464,11 +2464,11 @@ LValue ItaniumCXXABI::EmitThreadLocalVarDeclLValue(CodeGenFunction &CGF,
 /// if it's a base constructor or destructor with virtual bases.
 bool ItaniumCXXABI::NeedsVTTParameter(GlobalDecl GD) {
   const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
-  
+
   // We don't have any virtual bases, just return early.
   if (!MD->getParent()->getNumVBases())
     return false;
-  
+
   // Check if we have a base constructor.
   if (isa<CXXConstructorDecl>(MD) && GD.getCtorType() == Ctor_Base)
     return true;
@@ -2476,7 +2476,7 @@ bool ItaniumCXXABI::NeedsVTTParameter(GlobalDecl GD) {
   // Check if we have a base destructor.
   if (isa<CXXDestructorDecl>(MD) && GD.getDtorType() == Dtor_Base)
     return true;
-  
+
   return false;
 }
 
diff --git a/lib/Driver/ToolChains/CommonArgs.cpp b/lib/Driver/ToolChains/CommonArgs.cpp
index 91f653a53e..5e7fe43901 100644
--- a/lib/Driver/ToolChains/CommonArgs.cpp
+++ b/lib/Driver/ToolChains/CommonArgs.cpp
@@ -725,7 +725,8 @@ void tools::SplitDebugInfo(const ToolChain &TC, Compilation &C, const Tool &T,
   ExtractArgs.push_back(Output.getFilename());
   ExtractArgs.push_back(OutFile);
 
-  const char *Exec = Args.MakeArgString(TC.GetProgramPath("objcopy"));
+  const char *Exec =
+      Args.MakeArgString(TC.GetProgramPath(CLANG_DEFAULT_OBJCOPY));
   InputInfo II(types::TY_Object, Output.getFilename(), Output.getFilename());
 
   // First extract the dwo sections.