Move the support for using .init_array from ARM to the generic

TargetLoweringObjectFileELF. Use this to support it on X86. Unlike ARM,
on X86 it is not easy to find out if .init_array should be used or not, so
the decision is made via TargetOptions and defaults to off.

Add a command line option to llc that enables it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158692 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 17 insertions, 0 deletions

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 74902c69ca..dec8d07d99 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -140,6 +140,8 @@ static TargetLoweringObjectFile *createTLOF(X86TargetMachine &TM) {
     return new TargetLoweringObjectFileMachO();
   }
 
+  if (Subtarget->isTargetLinux())
+    return new X86LinuxTargetObjectFile();
   if (Subtarget->isTargetELF())
     return new TargetLoweringObjectFileELF();
   if (Subtarget->isTargetCOFF() && !Subtarget->isTargetEnvMacho())
diff --git a/lib/Target/X86/X86TargetObjectFile.cpp b/lib/Target/X86/X86TargetObjectFile.cpp
index 718f35ea84..b8d673facc 100644
--- a/lib/Target/X86/X86TargetObjectFile.cpp
+++ b/lib/Target/X86/X86TargetObjectFile.cpp
@@ -9,12 +9,15 @@
 
 #include "X86TargetObjectFile.h"
 #include "X86TargetMachine.h"
+#include "llvm/ADT/StringExtras.h"
 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
 #include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCSectionELF.h"
 #include "llvm/MC/MCSectionMachO.h"
 #include "llvm/Target/Mangler.h"
 #include "llvm/Support/Dwarf.h"
+#include "llvm/Support/ELF.h"
 using namespace llvm;
 using namespace dwarf;
 
@@ -42,3 +45,9 @@ getCFIPersonalitySymbol(const GlobalValue *GV, Mangler *Mang,
                         MachineModuleInfo *MMI) const {
   return Mang->getSymbol(GV);
 }
+
+void
+X86LinuxTargetObjectFile::Initialize(MCContext &Ctx, const TargetMachine &TM) {
+  TargetLoweringObjectFileELF::Initialize(Ctx, TM);
+  InitializeELF(TM.Options.UseInitArray);
+}
diff --git a/lib/Target/X86/X86TargetObjectFile.h b/lib/Target/X86/X86TargetObjectFile.h
index a02a36809e..7698b59d69 100644
--- a/lib/Target/X86/X86TargetObjectFile.h
+++ b/lib/Target/X86/X86TargetObjectFile.h
@@ -32,6 +32,12 @@ namespace llvm {
                             MachineModuleInfo *MMI) const;
   };
 
+  /// X86LinuxTargetObjectFile - This implementation is used for linux x86
+  /// and x86-64.
+  class X86LinuxTargetObjectFile : public TargetLoweringObjectFileELF {
+    virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
+  };
+
 } // end namespace llvm
 
 #endif