Revert "Honor -fuse-init-array when os is not specified on x86"

This reverts commit aa5ee8f244.

This change broke the sanitizer buildbots. See comments at the patchset
(https://reviews.llvm.org/D71360) for more information.

llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp

@@ -97,7 +97,6 @@ void TargetLoweringObjectFileELF::Initialize(MCContext &Ctx,
   TM = &TgtM;
 
   CodeModel::Model CM = TgtM.getCodeModel();
-  InitializeELF(TgtM.Options.UseInitArray);
 
   switch (TgtM.getTargetTriple().getArch()) {
   case Triple::arm:

llvm/lib/Target/AArch64/AArch64TargetObjectFile.cpp

@@ -20,6 +20,7 @@ using namespace dwarf;
 void AArch64_ELFTargetObjectFile::Initialize(MCContext &Ctx,
                                              const TargetMachine &TM) {
   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
+  InitializeELF(TM.Options.UseInitArray);
   // AARCH64 ELF ABI does not define static relocation type for TLS offset
   // within a module.  Do not generate AT_location for TLS variables.
   SupportDebugThreadLocalLocation = false;

llvm/lib/Target/Hexagon/HexagonTargetObjectFile.cpp

@@ -112,6 +112,7 @@ static const char *getSectionSuffixForSize(unsigned Size) {
 void HexagonTargetObjectFile::Initialize(MCContext &Ctx,
       const TargetMachine &TM) {
   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
+  InitializeELF(TM.Options.UseInitArray);
 
   SmallDataSection =
     getContext().getELFSection(".sdata", ELF::SHT_PROGBITS,

llvm/lib/Target/Lanai/LanaiTargetObjectFile.cpp

@@ -28,6 +28,7 @@ static cl::opt<unsigned> SSThreshold(
 void LanaiTargetObjectFile::Initialize(MCContext &Ctx,
                                        const TargetMachine &TM) {
   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
+  InitializeELF(TM.Options.UseInitArray);
 
   SmallDataSection = getContext().getELFSection(
       ".sdata", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);

llvm/lib/Target/Mips/MipsTargetObjectFile.cpp

@@ -44,6 +44,7 @@ EmbeddedData("membedded-data", cl::Hidden,
 
 void MipsTargetObjectFile::Initialize(MCContext &Ctx, const TargetMachine &TM){
   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
+  InitializeELF(TM.Options.UseInitArray);
 
   SmallDataSection = getContext().getELFSection(
       ".sdata", ELF::SHT_PROGBITS,

llvm/lib/Target/PowerPC/PPCTargetObjectFile.cpp

@@ -18,6 +18,7 @@ void
 PPC64LinuxTargetObjectFile::
 Initialize(MCContext &Ctx, const TargetMachine &TM) {
   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
+  InitializeELF(TM.Options.UseInitArray);
 }
 
 MCSection *PPC64LinuxTargetObjectFile::SelectSectionForGlobal(

llvm/lib/Target/RISCV/RISCVTargetObjectFile.cpp

@@ -17,6 +17,7 @@ using namespace llvm;
 void RISCVELFTargetObjectFile::Initialize(MCContext &Ctx,
                                           const TargetMachine &TM) {
   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
+  InitializeELF(TM.Options.UseInitArray);
 
   SmallDataSection = getContext().getELFSection(
       ".sdata", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);

llvm/lib/Target/Sparc/SparcTargetObjectFile.cpp

@@ -17,6 +17,7 @@ using namespace llvm;
 void SparcELFTargetObjectFile::Initialize(MCContext &Ctx,
                                           const TargetMachine &TM) {
   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
+  InitializeELF(TM.Options.UseInitArray);
 }
 
 const MCExpr *SparcELFTargetObjectFile::getTTypeGlobalReference(

llvm/lib/Target/X86/X86TargetMachine.cpp

@@ -92,9 +92,19 @@ static std::unique_ptr<TargetLoweringObjectFile> createTLOF(const Triple &TT) {
     return std::make_unique<TargetLoweringObjectFileMachO>();
   }
 
+  if (TT.isOSFreeBSD())
+    return std::make_unique<X86FreeBSDTargetObjectFile>();
+  if (TT.isOSLinux() || TT.isOSNaCl() || TT.isOSIAMCU())
+    return std::make_unique<X86LinuxNaClTargetObjectFile>();
+  if (TT.isOSSolaris())
+    return std::make_unique<X86SolarisTargetObjectFile>();
+  if (TT.isOSFuchsia())
+    return std::make_unique<X86FuchsiaTargetObjectFile>();
+  if (TT.isOSBinFormatELF())
+    return std::make_unique<X86ELFTargetObjectFile>();
   if (TT.isOSBinFormatCOFF())
     return std::make_unique<TargetLoweringObjectFileCOFF>();
-  return std::make_unique<X86ELFTargetObjectFile>();
+  llvm_unreachable("unknown subtarget type");
 }
 
 static std::string computeDataLayout(const Triple &TT) {

llvm/lib/Target/X86/X86TargetObjectFile.cpp

@@ -65,7 +65,28 @@ const MCExpr *X86ELFTargetObjectFile::getDebugThreadLocalSymbol(
 }
 
 void
-X86ELFTargetObjectFile::Initialize(MCContext &Ctx,
+X86FreeBSDTargetObjectFile::Initialize(MCContext &Ctx,
                                        const TargetMachine &TM) {
   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
+  InitializeELF(TM.Options.UseInitArray);
+}
+
+void
+X86FuchsiaTargetObjectFile::Initialize(MCContext &Ctx,
+                                       const TargetMachine &TM) {
+  TargetLoweringObjectFileELF::Initialize(Ctx, TM);
+  InitializeELF(TM.Options.UseInitArray);
+}
+
+void
+X86LinuxNaClTargetObjectFile::Initialize(MCContext &Ctx,
+                                         const TargetMachine &TM) {
+  TargetLoweringObjectFileELF::Initialize(Ctx, TM);
+  InitializeELF(TM.Options.UseInitArray);
+}
+
+void X86SolarisTargetObjectFile::Initialize(MCContext &Ctx,
+                                            const TargetMachine &TM) {
+  TargetLoweringObjectFileELF::Initialize(Ctx, TM);
+  InitializeELF(TM.Options.UseInitArray);
 }

llvm/lib/Target/X86/X86TargetObjectFile.h

@@ -44,11 +44,33 @@ namespace llvm {
     X86ELFTargetObjectFile() {
       PLTRelativeVariantKind = MCSymbolRefExpr::VK_PLT;
     }
-    void Initialize(MCContext &Ctx, const TargetMachine &TM) override;
+
     /// Describe a TLS variable address within debug info.
     const MCExpr *getDebugThreadLocalSymbol(const MCSymbol *Sym) const override;
   };
 
+  /// X86FreeBSDTargetObjectFile - This implementation is used for FreeBSD
+  /// on x86 and x86-64.
+  class X86FreeBSDTargetObjectFile : public X86ELFTargetObjectFile {
+    void Initialize(MCContext &Ctx, const TargetMachine &TM) override;
+  };
+
+  /// This implementation is used for Fuchsia on x86-64.
+  class X86FuchsiaTargetObjectFile : public X86ELFTargetObjectFile {
+    void Initialize(MCContext &Ctx, const TargetMachine &TM) override;
+  };
+
+  /// X86LinuxNaClTargetObjectFile - This implementation is used for linux and
+  /// Native Client on x86 and x86-64.
+  class X86LinuxNaClTargetObjectFile : public X86ELFTargetObjectFile {
+    void Initialize(MCContext &Ctx, const TargetMachine &TM) override;
+  };
+
+  /// This implementation is used for Solaris on x86/x86-64.
+  class X86SolarisTargetObjectFile : public X86ELFTargetObjectFile {
+    void Initialize(MCContext &Ctx, const TargetMachine &TM) override;
+  };
+
 } // end namespace llvm
 
 #endif

llvm/test/CodeGen/X86/constructor.ll

@@ -8,7 +8,6 @@
 ; RUN: llc -mtriple i586-intel-elfiamcu -use-ctors < %s | FileCheck %s --check-prefix=MCU-CTORS
 ; RUN: llc -mtriple i586-intel-elfiamcu < %s | FileCheck %s --check-prefix=MCU-INIT-ARRAY
 ; RUN: llc -mtriple x86_64-win32-gnu < %s | FileCheck --check-prefix=COFF-CTOR %s
-; RUN: llc -mtriple x86_64 -use-ctors=false < %s | FileCheck %s
 @llvm.global_ctors = appending global [3 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 65535, void ()* @f, i8* null}, { i32, void ()*, i8* } { i32 15, void ()* @g, i8* @v }, { i32, void ()*, i8* } { i32 55555, void ()* @h, i8* @v }]
 
 @v = weak_odr global i8 0
@@ -70,5 +69,3 @@ entry:
 ; COFF-CTOR-NEXT:	.section	.ctors,"dw"
 ; COFF-CTOR-NEXT:	.p2align	3
 ; COFF-CTOR-NEXT:	.quad	f
-
-; CHECK: .init_array

llvm/test/CodeGen/X86/init-priority.ll

@@ -1,4 +1,4 @@
-; RUN: llc < %s -mtriple=x86_64-netbsd -use-ctors | FileCheck %s
+; RUN: llc < %s -mtriple=x86_64-netbsd | FileCheck %s
 
 ; Check that our compiler never emits global constructors
 ; inside the .init_array section when building for a non supported target.