From: Chris Lattner <sabre@nondot.org>
Date: Thu, 26 Jun 2003 05:30:40 +0000 (+0000)
Subject: When internalizing global ctor/dtor list, also mark it constant.  This is gross, but
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=81d4e14449fce69ca3a315685a80bb3c20a3db23;p=oota-llvm.git

When internalizing global ctor/dtor list, also mark it constant.  This is gross, but
until DSA is working all of the time and is totally reliable, we do this.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6917 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/IPO/Internalize.cpp b/lib/Transforms/IPO/Internalize.cpp
index ec28ecf81d0..0ed76aba628 100644
--- a/lib/Transforms/IPO/Internalize.cpp
+++ b/lib/Transforms/IPO/Internalize.cpp
@@ -87,6 +87,14 @@ namespace {
       for (Module::giterator I = M.gbegin(), E = M.gend(); I != E; ++I)
         if (!I->isExternal() && !I->hasInternalLinkage() &&
             !ExternalNames.count(I->getName())) {
+          // Special case handling of the global ctor and dtor list.  When we
+          // internalize it, we mark it constant, which allows elimination of
+          // the list if it's empty.
+          //
+          if (I->hasAppendingLinkage() && (I->getName() == "llvm.global_ctors"||
+                                           I->getName() == "llvm.global_dtors"))
+            I->setConstant(true);
+
           I->setLinkage(GlobalValue::InternalLinkage);
           Changed = true;
           ++NumGlobals;