Rebased PNaCl localmods in LLVM to 223109

lib/Target/X86/X86TargetObjectFile.cpp

 //===-- X86TargetObjectFile.cpp - X86 Object Info -------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 
 #include "X86TargetObjectFile.h"
+#include "X86Subtarget.h"  // @LOCALMOD
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/IR/Mangler.h"
 #include "llvm/IR/Operator.h"
 #include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCExpr.h"
 #include "llvm/MC/MCSectionCOFF.h"
 #include "llvm/MC/MCSectionELF.h"
 #include "llvm/Support/Dwarf.h"
 #include "llvm/Target/TargetLowering.h"
 
@@ skipping 141 matching lines @@
                                    COFF::IMAGE_SCN_LNK_COMDAT;
         return getContext().getCOFFSection(".rdata", Characteristics, Kind,
                                            COMDATSymName,
                                            COFF::IMAGE_COMDAT_SELECT_ANY);
       }
     }
   }
 
   return TargetLoweringObjectFile::getSectionForConstant(Kind, C);
 }
+
+// @LOCALMOD-START
+// NOTE: this was largely lifted from
+// lib/Target/ARM/ARMTargetObjectFile.cpp
+//
+// The default is .ctors/.dtors while the arm backend uses
+// .init_array/.fini_array
+//
+// Without this the linker defined symbols __fini_array_start and
+// __fini_array_end do not have useful values. c.f.:
+// http://code.google.com/p/nativeclient/issues/detail?id=805
+void TargetLoweringObjectFileNaCl::Initialize(MCContext &Ctx,
+                                              const TargetMachine &TM) {
+  TargetLoweringObjectFileELF::Initialize(Ctx, TM);
+
+  StaticCtorSection =
+    getContext().getELFSection(".init_array", ELF::SHT_INIT_ARRAY,
+                               ELF::SHF_WRITE |
+                               ELF::SHF_ALLOC,
+                               SectionKind::getDataRel());
+  StaticDtorSection =
+    getContext().getELFSection(".fini_array", ELF::SHT_FINI_ARRAY,
+                               ELF::SHF_WRITE |
+                               ELF::SHF_ALLOC,
+                               SectionKind::getDataRel());
+}
+// @LOCALMOD-END