IRGen: Start using the WriteThinLTOBitcode pass.

This is the final change necessary to support CFI with ThinLTO. Differential Revision: https://reviews.llvm.org/D28843 llvm-svn: 292662
llvm · Jan 20, 2017 · 6f16ac1 · 6f16ac1
1 parent e02b74e
commit 6f16ac1
Show file tree

Hide file tree

Showing 3 changed files with 17 additions and 3 deletions.
diff --git a/clang/lib/CodeGen/BackendUtil.cpp b/clang/lib/CodeGen/BackendUtil.cpp
@@ -689,9 +689,11 @@ void EmitAssemblyHelper::EmitAssembly(BackendAction Action,
     break;
 
   case Backend_EmitBC:
-    PerModulePasses.add(createBitcodeWriterPass(
-        *OS, CodeGenOpts.EmitLLVMUseLists, CodeGenOpts.EmitSummaryIndex,
-        CodeGenOpts.EmitSummaryIndex));
+    if (CodeGenOpts.EmitSummaryIndex)
+      PerModulePasses.add(createWriteThinLTOBitcodePass(*OS));
+    else
+      PerModulePasses.add(
+          createBitcodeWriterPass(*OS, CodeGenOpts.EmitLLVMUseLists));
     break;
 
   case Backend_EmitLL:

diff --git a/clang/test/CMakeLists.txt b/clang/test/CMakeLists.txt
@@ -80,6 +80,7 @@ if( NOT CLANG_BUILT_STANDALONE )
     llc
     llvm-bcanalyzer
     llvm-dis
+    llvm-modextract
     llvm-nm
     llvm-objdump
     llvm-profdata

diff --git a/clang/test/CodeGenCXX/type-metadata-thinlto.cpp b/clang/test/CodeGenCXX/type-metadata-thinlto.cpp
@@ -0,0 +1,11 @@
+// RUN: %clang_cc1 -flto=thin -flto-unit -triple x86_64-unknown-linux -fvisibility hidden -emit-llvm-bc -o %t %s
+// RUN: llvm-modextract -o - -n 1 %t | llvm-dis | FileCheck %s
+
+// CHECK: @_ZTV1A = linkonce_odr
+class A {
+  virtual void f() {}
+};
+
+A *f() {
+  return new A;
+}