CodeGen: Error on redefinitions instead of asserting

It's possible to have a prior definition of a symbol in module asm.
Raise an error instead of crashing.

llvm-svn: 224828

1 files changed, 11 insertions, 5 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index 93445a8c84f..80221d7feb6 100644
--- a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -338,6 +338,9 @@ void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
     return;
 
   GVSym->redefineIfPossible();
+  if (GVSym->isDefined() || GVSym->isVariable())
+    report_fatal_error("symbol '" + Twine(GVSym->getName()) +
+                       "' is already defined");
 
   if (MAI->hasDotTypeDotSizeDirective())
     OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
@@ -547,11 +550,14 @@ void AsmPrinter::EmitFunctionEntryLabel() {
 
   // The function label could have already been emitted if two symbols end up
   // conflicting due to asm renaming.  Detect this and emit an error.
-  if (CurrentFnSym->isUndefined())
-    return OutStreamer.EmitLabel(CurrentFnSym);
-
-  report_fatal_error("'" + Twine(CurrentFnSym->getName()) +
-                     "' label emitted multiple times to assembly file");
+  if (CurrentFnSym->isVariable())
+    report_fatal_error("'" + Twine(CurrentFnSym->getName()) +
+                       "' is a protected alias");
+  if (CurrentFnSym->isDefined())
+    report_fatal_error("'" + Twine(CurrentFnSym->getName()) +
+                       "' label emitted multiple times to assembly file");
+
+  return OutStreamer.EmitLabel(CurrentFnSym);
 }
 
 /// emitComments - Pretty-print comments for instructions.