PNaCl: Fix ExpandTls to handle GlobalAliases of thread-local variables

Expand out these aliases in the ExpandTlsConstantExpr pass.

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3347
TEST=test/Transforms/NaCl/expand-tls-constexpr-alias.ll

Review URL: https://codereview.chromium.org/12989011

1 files changed, 8 insertions, 0 deletions

diff --git a/lib/Transforms/NaCl/ExpandTlsConstantExpr.cpp b/lib/Transforms/NaCl/ExpandTlsConstantExpr.cpp
index 45612b2616..51b21cbf2a 100644
--- a/lib/Transforms/NaCl/ExpandTlsConstantExpr.cpp
+++ b/lib/Transforms/NaCl/ExpandTlsConstantExpr.cpp
@@ -95,6 +95,14 @@ static void expandConstExpr(Constant *Expr) {
 }
 
 bool ExpandTlsConstantExpr::runOnModule(Module &M) {
+  for (Module::alias_iterator Iter = M.alias_begin();
+       Iter != M.alias_end(); ) {
+    GlobalAlias *GA = Iter++;
+    if (GA->isThreadDependent()) {
+      GA->replaceAllUsesWith(GA->getAliasee());
+      GA->eraseFromParent();
+    }
+  }
   for (Module::global_iterator Global = M.global_begin();
        Global != M.global_end();
        ++Global) {