From 1a7ca0354a44e321d5f4839a73239e6eaec54ad5 Mon Sep 17 00:00:00 2001
From: Devang Patel <dpatel@apple.com>
Date: Tue, 28 Sep 2010 18:08:20 +0000
Subject: [PATCH] Provide an interface to let FEs anchor debug info for types.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114969 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Analysis/DebugInfo.h     | 5 +++++
 lib/Analysis/DebugInfo.cpp            | 8 ++++++++
 lib/CodeGen/AsmPrinter/DwarfDebug.cpp | 4 ++++
 3 files changed, 17 insertions(+)

diff --git a/include/llvm/Analysis/DebugInfo.h b/include/llvm/Analysis/DebugInfo.h
index d5733aeb75f..1b544e5c145 100644
--- a/include/llvm/Analysis/DebugInfo.h
+++ b/include/llvm/Analysis/DebugInfo.h
@@ -763,6 +763,11 @@ namespace llvm {
     /// InsertDbgValueIntrinsic - Insert a new llvm.dbg.value intrinsic call.
     Instruction *InsertDbgValueIntrinsic(llvm::Value *V, uint64_t Offset,
                                        DIVariable D, Instruction *InsertBefore);
+
+    // RecordType - Record DIType in a module such that it is not lost even if
+    // it is not referenced through debug info anchors.
+    void RecordType(DIType T);
+
   private:
     Constant *GetTagConstant(unsigned TAG);
   };
diff --git a/lib/Analysis/DebugInfo.cpp b/lib/Analysis/DebugInfo.cpp
index fec269e2205..dba7b8f2422 100644
--- a/lib/Analysis/DebugInfo.cpp
+++ b/lib/Analysis/DebugInfo.cpp
@@ -1306,6 +1306,14 @@ Instruction *DIFactory::InsertDbgValueIntrinsic(Value *V, uint64_t Offset,
   return CallInst::Create(ValueFn, Args, Args+3, "", InsertAtEnd);
 }
 
+// RecordType - Record DIType in a module such that it is not lost even if
+// it is not referenced through debug info anchors.
+void DIFactory::RecordType(DIType T) {
+  NamedMDNode *NMD = M.getOrInsertNamedMetadata("llvm.dbg.ty");
+  NMD->addOperand(T);
+}
+
+
 //===----------------------------------------------------------------------===//
 // DebugInfoFinder implementations.
 //===----------------------------------------------------------------------===//
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 6fb9b163a03..f26047aee43 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -2056,6 +2056,10 @@ void DwarfDebug::beginModule(Module *M) {
     for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i)
       getOrCreateTypeDIE(DIType(NMD->getOperand(i)));
 
+  if (NamedMDNode *NMD = M->getNamedMetadata("llvm.dbg.ty"))
+    for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i)
+      getOrCreateTypeDIE(DIType(NMD->getOperand(i)));
+
   // Prime section data.
   SectionMap.insert(Asm->getObjFileLowering().getTextSection());