[llvm] r283254 - Revert r283248. It caused failures in the hexagon buildbots.

[David L Kreitzer via llvm-commits]

Author: dlkreitz
Date: Tue Oct  4 15:57:19 2016
New Revision: 283254

URL: http://llvm.org/viewvc/llvm-project?rev=283254&view=rev
Log:
Revert r283248. It caused failures in the hexagon buildbots.

Modified:
    llvm/trunk/lib/CodeGen/SafeStack.cpp

Modified: llvm/trunk/lib/CodeGen/SafeStack.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SafeStack.cpp?rev=283254&r1=283253&r2=283254&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SafeStack.cpp (original)
+++ llvm/trunk/lib/CodeGen/SafeStack.cpp Tue Oct  4 15:57:19 2016
@@ -358,8 +358,9 @@ bool SafeStack::IsSafeStackAlloca(const
 
 Value *SafeStack::getOrCreateUnsafeStackPtr(IRBuilder<> &IRB, Function &F) {
   // Check if there is a target-specific location for the unsafe stack pointer.
-  if (Value *V = TL->getSafeStackPointerLocation(IRB))
-    return V;
+  if (TL)
+    if (Value *V = TL->getSafeStackPointerLocation(IRB))
+      return V;
 
   // Otherwise, assume the target links with compiler-rt, which provides a
   // thread-local variable with a magic name.
@@ -392,7 +393,9 @@ Value *SafeStack::getOrCreateUnsafeStack
 }
 
 Value *SafeStack::getStackGuard(IRBuilder<> &IRB, Function &F) {
-  Value *StackGuardVar = TL->getIRStackGuard(IRB);
+  Value *StackGuardVar = nullptr;
+  if (TL)
+    StackGuardVar = TL->getIRStackGuard(IRB);
   if (!StackGuardVar)
     StackGuardVar =
         F.getParent()->getOrInsertGlobal("__stack_chk_guard", StackPtrTy);
@@ -749,9 +752,7 @@ bool SafeStack::runOnFunction(Function &
     return false;
   }
 
-  if (!TM)
-    report_fatal_error("Target machine is required");
-  TL = TM->getSubtargetImpl(F)->getTargetLowering();
+  TL = TM ? TM->getSubtargetImpl(F)->getTargetLowering() : nullptr;
   SE = &getAnalysis<ScalarEvolutionWrapperPass>().getSE();
 
   ++NumFunctions;