[NFC][DirectX backend] Fix crash when emit_obj for DirectX backend.

When emit-obj from clang directly, DirectX backend will hit assert caused by not initialize passes for AsmPrinter.
The fix will initialize the passes by calling createPassConfig.
Also ignore global variable which not has section in DXILAsmPrinter::emitGlobalVariable to avoid hit llvm_unreachable in DXILTargetObjectFile::SelectSectionForGlobal.

Reviewed By: beanz

Differential Revision: https://reviews.llvm.org/D130856

1 files changed, 8 insertions, 3 deletions

diff --git a/llvm/lib/Target/DirectX/DirectXTargetMachine.cpp b/llvm/lib/Target/DirectX/DirectXTargetMachine.cpp
index 44bef80..8ea074cb 100644
--- a/llvm/lib/Target/DirectX/DirectXTargetMachine.cpp
+++ b/llvm/lib/Target/DirectX/DirectXTargetMachine.cpp
@@ -67,6 +67,11 @@ public:
   }
 
   FunctionPass *createTargetRegisterAllocator(bool) override { return nullptr; }
+  void addCodeGenPrepare() override {
+    addPass(createDXILOpLoweringLegacyPass());
+    addPass(createDXILPrepareModulePass());
+    addPass(createDXILTranslateMetadataPass());
+  }
 };
 
 DirectXTargetMachine::DirectXTargetMachine(const Target &T, const Triple &TT,
@@ -91,9 +96,9 @@ bool DirectXTargetMachine::addPassesToEmitFile(
     PassManagerBase &PM, raw_pwrite_stream &Out, raw_pwrite_stream *DwoOut,
     CodeGenFileType FileType, bool DisableVerify,
     MachineModuleInfoWrapperPass *MMIWP) {
-  PM.add(createDXILOpLoweringLegacyPass());
-  PM.add(createDXILPrepareModulePass());
-  PM.add(createDXILTranslateMetadataPass());
+  TargetPassConfig *PassConfig = createPassConfig(PM);
+  PassConfig->addCodeGenPrepare();
+
   if (TargetPassConfig::willCompleteCodeGenPipeline()) {
     PM.add(createDXILEmbedderPass());
   }