From 43a65d9529c24c3253d385cde91cf4c9dad4155e Mon Sep 17 00:00:00 2001
From: Teresa Johnson <tejohnson@google.com>
Date: Fri, 12 Jun 2015 03:12:00 +0000
Subject: Revert commit r239480 as it causes
 https://code.google.com/p/chromium/issues/detail?id=499508#c3.

llvm-svn: 239589
---
 llvm/lib/Transforms/IPO/ElimAvailExtern.cpp | 96 -----------------------------
 1 file changed, 96 deletions(-)
 delete mode 100644 llvm/lib/Transforms/IPO/ElimAvailExtern.cpp

(limited to 'llvm/lib/Transforms/IPO/ElimAvailExtern.cpp')

diff --git a/llvm/lib/Transforms/IPO/ElimAvailExtern.cpp b/llvm/lib/Transforms/IPO/ElimAvailExtern.cpp
deleted file mode 100644
index e70ab871b88..00000000000
--- a/llvm/lib/Transforms/IPO/ElimAvailExtern.cpp
+++ /dev/null
@@ -1,96 +0,0 @@
-//===-- ElimAvailExtern.cpp - DCE unreachable internal functions ----------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This transform is designed to eliminate available external global
-// definitions from the program, turning them into declarations.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Transforms/IPO.h"
-#include "llvm/ADT/Statistic.h"
-#include "llvm/IR/Constants.h"
-#include "llvm/IR/Instructions.h"
-#include "llvm/IR/Module.h"
-#include "llvm/Transforms/Utils/CtorUtils.h"
-#include "llvm/Transforms/Utils/GlobalStatus.h"
-#include "llvm/Pass.h"
-using namespace llvm;
-
-#define DEBUG_TYPE "elim-avail-extern"
-
-STATISTIC(NumAliases  , "Number of global aliases removed");
-STATISTIC(NumFunctions, "Number of functions removed");
-STATISTIC(NumVariables, "Number of global variables removed");
-
-namespace {
-  struct EliminateAvailableExternally : public ModulePass {
-    static char ID; // Pass identification, replacement for typeid
-    EliminateAvailableExternally() : ModulePass(ID) {
-      initializeEliminateAvailableExternallyPass(
-          *PassRegistry::getPassRegistry());
-    }
-
-    // run - Do the EliminateAvailableExternally pass on the specified module,
-    // optionally updating the specified callgraph to reflect the changes.
-    //
-    bool runOnModule(Module &M) override;
-  };
-}
-
-char EliminateAvailableExternally::ID = 0;
-INITIALIZE_PASS(EliminateAvailableExternally, "elim-avail-extern",
-                "Eliminate Available Externally Globals", false, false)
-
-ModulePass *llvm::createEliminateAvailableExternallyPass() {
-  return new EliminateAvailableExternally();
-}
-
-bool EliminateAvailableExternally::runOnModule(Module &M) {
-  bool Changed = false;
-
-  // Drop initializers of available externally global variables.
-  for (Module::global_iterator I = M.global_begin(), E = M.global_end();
-       I != E; ++I) {
-    if (!I->hasAvailableExternallyLinkage())
-      continue;
-    if (I->hasInitializer()) {
-      Constant *Init = I->getInitializer();
-      I->setInitializer(nullptr);
-      if (isSafeToDestroyConstant(Init))
-        Init->destroyConstant();
-    }
-    I->removeDeadConstantUsers();
-    I->setLinkage(GlobalValue::ExternalLinkage);
-    NumVariables++;
-  }
-
-  // Drop the bodies of available externally functions.
-  for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
-    if (!I->hasAvailableExternallyLinkage())
-      continue;
-    if (!I->isDeclaration())
-      // This will set the linkage to external
-      I->deleteBody();
-    I->removeDeadConstantUsers();
-    NumFunctions++;
-  }
-
-  // Drop targets of available externally aliases.
-  for (Module::alias_iterator I = M.alias_begin(), E = M.alias_end(); I != E;
-       ++I) {
-    if (!I->hasAvailableExternallyLinkage())
-      continue;
-    I->setAliasee(nullptr);
-    I->removeDeadConstantUsers();
-    I->setLinkage(GlobalValue::ExternalLinkage);
-    NumAliases++;
-  }
-
-  return Changed;
-}
-- 
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