From 805f34e607fadc603eefa3120ff514a2f3432392 Mon Sep 17 00:00:00 2001
From: Dan Gohman <sunfish@mozilla.com>
Date: Wed, 5 Mar 2014 19:40:14 -0800
Subject: Disable the ResolveAliases and GlobalCleanup passes.

Also add a test for handling of global aliases.
---
 lib/Target/JSBackend/JSBackend.cpp       |  5 +++
 lib/Transforms/NaCl/PNaClABISimplify.cpp |  4 +++
 test/CodeGen/JS/global-alias.ll          | 56 ++++++++++++++++++++++++++++++++
 3 files changed, 65 insertions(+)
 create mode 100644 test/CodeGen/JS/global-alias.ll

diff --git a/lib/Target/JSBackend/JSBackend.cpp b/lib/Target/JSBackend/JSBackend.cpp
index 65504326b0..856a051fe9 100644
--- a/lib/Target/JSBackend/JSBackend.cpp
+++ b/lib/Target/JSBackend/JSBackend.cpp
@@ -950,6 +950,11 @@ std::string JSWriter::getConstant(const Constant* CV, AsmCast sign) {
       Externals.insert(Name);
       return Name;
     }
+    if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(CV)) {
+      // Since we don't currently support linking of our output, we don't need
+      // to worry about weak or other kinds of aliases.
+      return getConstant(GA->getAliasee(), sign);
+    }
     return utostr(getGlobalAddress(GV->getName().str()));
   }
 
diff --git a/lib/Transforms/NaCl/PNaClABISimplify.cpp b/lib/Transforms/NaCl/PNaClABISimplify.cpp
index 5678ffaa7f..886e0cc4cc 100644
--- a/lib/Transforms/NaCl/PNaClABISimplify.cpp
+++ b/lib/Transforms/NaCl/PNaClABISimplify.cpp
@@ -77,13 +77,17 @@ void llvm::PNaClABISimplifyAddPreOptPasses(PassManager &PM) {
 
   PM.add(createExpandVarArgsPass());
   PM.add(createExpandCtorsPass());
+#if 0 // XXX EMSCRIPTEN: We handle aliases.
   PM.add(createResolveAliasesPass());
+#endif
 #if 0 // EMSCRIPTEN: no need for tls
   PM.add(createExpandTlsPass());
 #endif
   // GlobalCleanup needs to run after ExpandTls because
   // __tls_template_start etc. are extern_weak before expansion
+#if 0 // XXX EMSCRIPTEN: We don't currently have tls, and we don't have the same complications with extern_weak
   PM.add(createGlobalCleanupPass());
+#endif
 }
 
 void llvm::PNaClABISimplifyAddPostOptPasses(PassManager &PM) {
diff --git a/test/CodeGen/JS/global-alias.ll b/test/CodeGen/JS/global-alias.ll
new file mode 100644
index 0000000000..b6efc0e7e7
--- /dev/null
+++ b/test/CodeGen/JS/global-alias.ll
@@ -0,0 +1,56 @@
+; RUN: llc -march=js < %s | FileCheck %s
+
+; Handle global aliases of various kinds.
+
+@pri = internal global [60 x i8] zeroinitializer
+@pub = global [60 x i8] zeroinitializer
+
+@pri_int = alias internal [60 x i8]* @pri
+@pri_wea = alias weak [60 x i8]* @pri
+@pri_nor = alias [60 x i8]* @pri
+
+@pub_int = alias internal [60 x i8]* @pub
+@pub_wea = alias weak [60 x i8]* @pub
+@pub_nor = alias [60 x i8]* @pub
+
+; CHECK: test0(
+; CHECK: return ([[PRI:[0-9]+]]|0);
+define [60 x i8]* @test0() {
+  ret [60 x i8]* @pri
+}
+; CHECK: test1(
+; CHECK: return ([[PRI]]|0);
+define [60 x i8]* @test1() {
+  ret [60 x i8]* @pri_int
+}
+; CHECK: test2(
+; CHECK: return ([[PRI]]|0);
+define [60 x i8]* @test2() {
+  ret [60 x i8]* @pri_wea
+}
+; CHECK: test3(
+; CHECK: return ([[PRI]]|0);
+define [60 x i8]* @test3() {
+  ret [60 x i8]* @pri_nor
+}
+
+; CHECK: test4(
+; CHECK: return ([[PUB:[0-9]+]]|0);
+define [60 x i8]* @test4() {
+  ret [60 x i8]* @pub
+}
+; CHECK: test5(
+; CHECK: return ([[PUB]]|0);
+define [60 x i8]* @test5() {
+  ret [60 x i8]* @pub_int
+}
+; CHECK: test6(
+; CHECK: return ([[PUB]]|0);
+define [60 x i8]* @test6() {
+  ret [60 x i8]* @pub_wea
+}
+; CHECK: test7(
+; CHECK: return ([[PUB]]|0);
+define [60 x i8]* @test7() {
+  ret [60 x i8]* @pub_nor
+}
-- 
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