Report a warning when dropping outdated debug info metadata.

Use DiagnosticInfo to emit the warning.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199346 91177308-0d34-0410-b5e6-96231b3b80d8

lib/IR/AutoUpgrade.cpp

@@ -14,6 +14,7 @@
 #include "llvm/AutoUpgrade.h"
 #include "llvm/DebugInfo.h"
 #include "llvm/IR/Constants.h"
+#include "llvm/IR/DiagnosticInfo.h"
 #include "llvm/IR/Function.h"
 #include "llvm/IR/IRBuilder.h"
 #include "llvm/IR/Instruction.h"
@@ -494,8 +495,14 @@ Value *llvm::UpgradeBitCastExpr(unsigned Opc, Constant *C, Type *DestTy) {
 /// Check the debug info version number, if it is out-dated, drop the debug
 /// info. Return true if module is modified.
 bool llvm::UpgradeDebugInfo(Module &M) {
-  if (getDebugMetadataVersionFromModule(M) == DEBUG_METADATA_VERSION)
+  unsigned Version = getDebugMetadataVersionFromModule(M);
+  if (Version == DEBUG_METADATA_VERSION)
     return false;
 
-  return StripDebugInfo(M);
+  bool RetCode = StripDebugInfo(M);
+  if (RetCode) {
+    DiagnosticInfoDebugMetadataVersion DiagVersion(M, Version);
+    M.getContext().diagnose(DiagVersion);
+  }
+  return RetCode;
 }

lib/IR/DiagnosticInfo.cpp

@@ -51,3 +51,8 @@ void DiagnosticInfoStackSize::print(DiagnosticPrinter &DP) const {
   DP << "stack size limit exceeded (" << getStackSize() << ") in "
      << getFunction();
 }
+
+void DiagnosticInfoDebugMetadataVersion::print(DiagnosticPrinter &DP) const {
+  DP << "invalid debug metadata version (" << getMetadataVersion() << ") in "
+     << getModule();
+}

lib/IR/DiagnosticPrinter.cpp

@@ -13,6 +13,7 @@
 
 #include "llvm/ADT/Twine.h"
 #include "llvm/IR/DiagnosticPrinter.h"
+#include "llvm/IR/Module.h"
 #include "llvm/IR/Value.h"
 #include "llvm/Support/raw_ostream.h"
 
@@ -99,3 +100,8 @@ DiagnosticPrinter &DiagnosticPrinterRawOStream::operator<<(const Value &V) {
   Stream << V.getName();
   return *this;
 }
+
+DiagnosticPrinter &DiagnosticPrinterRawOStream::operator<<(const Module &M) {
+  Stream << M.getModuleIdentifier();
+  return *this;
+}