[llvm] r311272 - [GlobalIsel] Fix undefined behavior if Action not set (release), it aslo crashing in debug mode.

[Igor Breger via llvm-commits]

Author: ibreger
Date: Sat Aug 19 23:26:22 2017
New Revision: 311272

URL: http://llvm.org/viewvc/llvm-project?rev=311272&view=rev
Log:
[GlobalIsel] Fix undefined behavior if Action not set (release), it aslo crashing in debug mode.

Differential Revision: https://reviews.llvm.org/D34978

Modified:
    llvm/trunk/include/llvm/CodeGen/GlobalISel/LegalizerInfo.h

Modified: llvm/trunk/include/llvm/CodeGen/GlobalISel/LegalizerInfo.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/CodeGen/GlobalISel/LegalizerInfo.h?rev=311272&r1=311271&r2=311272&view=diff
==============================================================================
--- llvm/trunk/include/llvm/CodeGen/GlobalISel/LegalizerInfo.h (original)
+++ llvm/trunk/include/llvm/CodeGen/GlobalISel/LegalizerInfo.h Sat Aug 19 23:26:22 2017
@@ -162,6 +162,9 @@ public:
   /// on Ty until we find a legal type for this operation.
   Optional<LLT> findLegalizableSize(const InstrAspect &Aspect,
                                     function_ref<LLT(LLT)> NextType) const {
+    if (Aspect.Idx >= Actions[Aspect.Opcode - FirstOp].size())
+      return None;
+
     LegalizeAction Action;
     const TypeMap &Map = Actions[Aspect.Opcode - FirstOp][Aspect.Idx];
     LLT Ty = Aspect.Type;