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

2 files changed, 8 insertions, 1 deletions

diff --git a/include/llvm/CodeGen/TargetLoweringObjectFileImpl.h b/include/llvm/CodeGen/TargetLoweringObjectFileImpl.h
index 5a4213625b..9849e92f7d 100644
--- a/include/llvm/CodeGen/TargetLoweringObjectFileImpl.h
+++ b/include/llvm/CodeGen/TargetLoweringObjectFileImpl.h
@@ -33,6 +33,8 @@ namespace llvm {
 
 
 class TargetLoweringObjectFileELF : public TargetLoweringObjectFile {
+  bool UseInitArray;
+
 public:
   virtual ~TargetLoweringObjectFileELF() {}
 
@@ -66,6 +68,7 @@ public:
   getCFIPersonalitySymbol(const GlobalValue *GV, Mangler *Mang,
                           MachineModuleInfo *MMI) const;
 
+  void InitializeELF(bool UseInitArray_);
   virtual const MCSection *
   getStaticCtorSection(unsigned Priority = 65535) const;
   virtual const MCSection *
diff --git a/include/llvm/Target/TargetOptions.h b/include/llvm/Target/TargetOptions.h
index 12a2757315..bc60673589 100644
--- a/include/llvm/Target/TargetOptions.h
+++ b/include/llvm/Target/TargetOptions.h
@@ -43,7 +43,7 @@ namespace llvm {
           StackAlignmentOverride(0), RealignStack(true),
           DisableJumpTables(false), EnableFastISel(false),
           PositionIndependentExecutable(false), EnableSegmentedStacks(false),
-          TrapFuncName(""), FloatABIType(FloatABI::Default)
+          UseInitArray(false), TrapFuncName(""), FloatABIType(FloatABI::Default)
     {}
 
     /// PrintMachineCode - This flag is enabled when the -print-machineinstrs
@@ -172,6 +172,10 @@ namespace llvm {
 
     unsigned EnableSegmentedStacks : 1;
 
+    /// UseInitArray - Use .init_array instead of .ctors for static
+    /// constructors.
+    unsigned UseInitArray : 1;
+
     /// getTrapFunctionName - If this returns a non-empty string, this means
     /// isel should lower Intrinsic::trap to a call to the specified function
     /// name instead of an ISD::TRAP node.