[SimplifyCFG] Update the name of switch generated lookup table.

This patch appends the name of the function to the switch generated lookup
table. This will ease the visual debugging in identifying the function the table
is generated from.

Differential Revision: https://reviews.llvm.org/D34817

llvm-svn: 306867

1 files changed, 6 insertions, 4 deletions

diff --git a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
index 0970c436e66..e724b0a28c3 100644
--- a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
@@ -4781,7 +4781,7 @@ public:
   SwitchLookupTable(
       Module &M, uint64_t TableSize, ConstantInt *Offset,
       const SmallVectorImpl<std::pair<ConstantInt *, Constant *>> &Values,
-      Constant *DefaultValue, const DataLayout &DL);
+      Constant *DefaultValue, const DataLayout &DL, const StringRef &FuncName);
 
   /// Build instructions with Builder to retrieve the value at
   /// the position given by Index in the lookup table.
@@ -4835,7 +4835,7 @@ private:
 SwitchLookupTable::SwitchLookupTable(
     Module &M, uint64_t TableSize, ConstantInt *Offset,
     const SmallVectorImpl<std::pair<ConstantInt *, Constant *>> &Values,
-    Constant *DefaultValue, const DataLayout &DL)
+    Constant *DefaultValue, const DataLayout &DL, const StringRef &FuncName)
     : SingleValue(nullptr), BitMap(nullptr), BitMapElementTy(nullptr),
       LinearOffset(nullptr), LinearMultiplier(nullptr), Array(nullptr) {
   assert(Values.size() && "Can't build lookup table without values!");
@@ -4943,7 +4943,7 @@ SwitchLookupTable::SwitchLookupTable(
 
   Array = new GlobalVariable(M, ArrayTy, /*constant=*/true,
                              GlobalVariable::PrivateLinkage, Initializer,
-                             "switch.table");
+                             "switch.table." + FuncName);
   Array->setUnnamedAddr(GlobalValue::UnnamedAddr::Global);
   Kind = ArrayKind;
 }
@@ -5333,7 +5333,9 @@ static bool SwitchToLookupTable(SwitchInst *SI, IRBuilder<> &Builder,
 
     // If using a bitmask, use any value to fill the lookup table holes.
     Constant *DV = NeedMask ? ResultLists[PHI][0].second : DefaultResults[PHI];
-    SwitchLookupTable Table(Mod, TableSize, MinCaseVal, ResultList, DV, DL);
+    StringRef FuncName = SI->getParent()->getParent()->getName();
+    SwitchLookupTable Table(Mod, TableSize, MinCaseVal, ResultList, DV, DL,
+                            FuncName);
 
     Value *Result = Table.BuildLookup(TableIndex, Builder);