[ThinkLTO] Invoke build(Thin)?LTOPreLinkDefaultPipeline.

Previously it doesn't actually invoke the designated new PM builder
functions.

This patch moves NameAnonGlobalPass out from PassBuilder, as Chandler
points out that PassBuilder is used for non-O0 builds, and for
optimizations only.

Differential Revision: https://reviews.llvm.org/D34728

llvm-svn: 306756

1 files changed, 16 insertions, 4 deletions

diff --git a/clang/lib/CodeGen/BackendUtil.cpp b/clang/lib/CodeGen/BackendUtil.cpp
index bd01902..2621f03 100644
--- a/clang/lib/CodeGen/BackendUtil.cpp
+++ b/clang/lib/CodeGen/BackendUtil.cpp
@@ -54,6 +54,7 @@
 #include "llvm/Transforms/ObjCARC.h"
 #include "llvm/Transforms/Scalar.h"
 #include "llvm/Transforms/Scalar/GVN.h"
+#include "llvm/Transforms/Utils/NameAnonGlobals.h"
 #include "llvm/Transforms/Utils/SymbolRewriter.h"
 #include <memory>
 using namespace clang;
@@ -881,17 +882,28 @@ void EmitAssemblyHelper::EmitAssemblyWithNewPassManager(
   ModulePassManager MPM;
 
   if (!CodeGenOpts.DisableLLVMPasses) {
+    bool IsThinLTO = CodeGenOpts.EmitSummaryIndex;
+    bool IsLTO = CodeGenOpts.PrepareForLTO;
+
     if (CodeGenOpts.OptimizationLevel == 0) {
       // Build a minimal pipeline based on the semantics required by Clang,
       // which is just that always inlining occurs.
       MPM.addPass(AlwaysInlinerPass());
+      if (IsThinLTO)
+        MPM.addPass(NameAnonGlobalPass());
     } else {
-      // Otherwise, use the default pass pipeline. We also have to map our
-      // optimization levels into one of the distinct levels used to configure
-      // the pipeline.
+      // Map our optimization levels into one of the distinct levels used to
+      // configure the pipeline.
       PassBuilder::OptimizationLevel Level = mapToLevel(CodeGenOpts);
 
-      MPM = PB.buildPerModuleDefaultPipeline(Level);
+      if (IsThinLTO) {
+        MPM = PB.buildThinLTOPreLinkDefaultPipeline(Level);
+        MPM.addPass(NameAnonGlobalPass());
+      } else if (IsLTO) {
+        MPM = PB.buildLTOPreLinkDefaultPipeline(Level);
+      } else {
+        MPM = PB.buildPerModuleDefaultPipeline(Level);
+      }
     }
   }