From 4a8f62e36f97bbd2d17a8b8a860faf44ff895591 Mon Sep 17 00:00:00 2001
From: Davide Italiano <davide@freebsd.org>
Date: Mon, 8 Aug 2016 03:30:01 +0000
Subject: [PATCH] [MC] Delete use of *structors_used.

Jim Grosbach and Kevin Enderby think those are not used anymore.
Originally submitted by: Rafael Espindola

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277973 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/MC/MCAsmInfo.h           |  9 ---------
 lib/CodeGen/AsmPrinter/AsmPrinter.cpp | 12 ------------
 lib/MC/MCAsmInfo.cpp                  |  1 -
 lib/MC/MCAsmInfoDarwin.cpp            |  1 -
 4 files changed, 23 deletions(-)

diff --git a/include/llvm/MC/MCAsmInfo.h b/include/llvm/MC/MCAsmInfo.h
index a493e82ad6b..4ae21bf28cb 100644
--- a/include/llvm/MC/MCAsmInfo.h
+++ b/include/llvm/MC/MCAsmInfo.h
@@ -85,12 +85,6 @@ protected:
   /// directive for emitting thread local BSS Symbols.  Default is false.
   bool HasMachoTBSSDirective;
 
-  /// True if the compiler should emit a ".reference .constructors_used" or
-  /// ".reference .destructors_used" directive after the static ctor/dtor
-  /// list.  This directive is only emitted in Static relocation model.  Default
-  /// is false.
-  bool HasStaticCtorDtorReferenceInStaticMode;
-
   /// This is the maximum possible length of an instruction, which is needed to
   /// compute the size of an inline asm.  Defaults to 4.
   unsigned MaxInstLength;
@@ -449,9 +443,6 @@ public:
 
   bool hasMachoZeroFillDirective() const { return HasMachoZeroFillDirective; }
   bool hasMachoTBSSDirective() const { return HasMachoTBSSDirective; }
-  bool hasStaticCtorDtorReferenceInStaticMode() const {
-    return HasStaticCtorDtorReferenceInStaticMode;
-  }
   unsigned getMaxInstLength() const { return MaxInstLength; }
   unsigned getMinInstAlignment() const { return MinInstAlignment; }
   bool getDollarIsPC() const { return DollarIsPC; }
diff --git a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index c5f415cb529..05bf1cb192e 100644
--- a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -1536,12 +1536,6 @@ bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
     EmitXXStructorList(GV->getParent()->getDataLayout(), GV->getInitializer(),
                        /* isCtor */ true);
 
-    if (TM.getRelocationModel() == Reloc::Static &&
-        MAI->hasStaticCtorDtorReferenceInStaticMode()) {
-      StringRef Sym(".constructors_used");
-      OutStreamer->EmitSymbolAttribute(OutContext.getOrCreateSymbol(Sym),
-                                       MCSA_Reference);
-    }
     return true;
   }
 
@@ -1549,12 +1543,6 @@ bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
     EmitXXStructorList(GV->getParent()->getDataLayout(), GV->getInitializer(),
                        /* isCtor */ false);
 
-    if (TM.getRelocationModel() == Reloc::Static &&
-        MAI->hasStaticCtorDtorReferenceInStaticMode()) {
-      StringRef Sym(".destructors_used");
-      OutStreamer->EmitSymbolAttribute(OutContext.getOrCreateSymbol(Sym),
-                                       MCSA_Reference);
-    }
     return true;
   }
 
diff --git a/lib/MC/MCAsmInfo.cpp b/lib/MC/MCAsmInfo.cpp
index 4a05175fdec..3eb8f50de5a 100644
--- a/lib/MC/MCAsmInfo.cpp
+++ b/lib/MC/MCAsmInfo.cpp
@@ -31,7 +31,6 @@ MCAsmInfo::MCAsmInfo() {
   HasSubsectionsViaSymbols = false;
   HasMachoZeroFillDirective = false;
   HasMachoTBSSDirective = false;
-  HasStaticCtorDtorReferenceInStaticMode = false;
   MaxInstLength = 4;
   MinInstAlignment = 1;
   DollarIsPC = false;
diff --git a/lib/MC/MCAsmInfoDarwin.cpp b/lib/MC/MCAsmInfoDarwin.cpp
index fc60313dd6b..e95cf488cd3 100644
--- a/lib/MC/MCAsmInfoDarwin.cpp
+++ b/lib/MC/MCAsmInfoDarwin.cpp
@@ -76,7 +76,6 @@ MCAsmInfoDarwin::MCAsmInfoDarwin() {
   ZeroDirective = "\t.space\t";  // ".space N" emits N zeros.
   HasMachoZeroFillDirective = true;  // Uses .zerofill
   HasMachoTBSSDirective = true; // Uses .tbss
-  HasStaticCtorDtorReferenceInStaticMode = true;
 
   // FIXME: Change this once MC is the system assembler.
   HasAggressiveSymbolFolding = false;
-- 
2.11.0