add new apis for getting/setting !dbg metadata on

instructions.  In addition to being a convenience,
they are faster than the old apis, particularly when
not going from an MDKindID like people should be
doing.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99982 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Instruction.h

@@ -156,6 +156,16 @@ public:
   void setMetadata(unsigned KindID, MDNode *Node);
   void setMetadata(const char *Kind, MDNode *Node);
 
+  /// setDbgMetadata - This is just an optimized helper function that is
+  /// equivalent to setMetadata("dbg", Node);
+  void setDbgMetadata(MDNode *Node);
+  
+  /// getDbgMetadata - This is just an optimized helper function that is
+  /// equivalent to calling getMetadata("dbg").
+  MDNode *getDbgMetadata() const {
+    return DbgInfo;
+  }
+  
 private:
   /// hasMetadataHashEntry - Return true if we have an entry in the on-the-side
   /// metadata hash.

include/llvm/Support/ValueHandle.h

@@ -284,8 +284,7 @@ class TrackingVH : public ValueHandleBase {
     Value *VP = ValueHandleBase::getValPtr();
 
     // Null is always ok.
-    if (!VP)
-        return;
+    if (!VP) return;
 
     // Check that this value is valid (i.e., it hasn't been deleted). We
     // explicitly delay this check until access to avoid requiring clients to be

lib/CodeGen/AsmPrinter/DwarfDebug.cpp

@@ -2014,7 +2014,8 @@ void DwarfDebug::collectVariableInfo() {
       // FIXME : Lift this restriction.
       if (MInsn->getNumOperands() != 3)
         continue;
-      DIVariable DV((MDNode*)(MInsn->getOperand(MInsn->getNumOperands() - 1).getMetadata()));
+      DIVariable DV((MDNode*)(MInsn->getOperand(MInsn->getNumOperands()
+                                                - 1).getMetadata()));
       if (DV.getTag() == dwarf::DW_TAG_arg_variable)  {
         // FIXME Handle inlined subroutine arguments.
         DbgVariable *ArgVar = new DbgVariable(DV, MInsn, NULL);

lib/CodeGen/SelectionDAG/FastISel.cpp

@@ -340,10 +340,9 @@ bool FastISel::SelectCall(User *I) {
       StaticAllocaMap.find(AI);
     if (SI == StaticAllocaMap.end()) break; // VLAs.
     int FI = SI->second;
-    if (MMI) {
-      if (MDNode *Dbg = DI->getMetadata("dbg"))
-        MMI->setVariableDbgInfo(DI->getVariable(), FI, Dbg);
-    }
+    if (MDNode *Dbg = DI->getDbgMetadata())
+      MMI->setVariableDbgInfo(DI->getVariable(), FI, Dbg);
+    
     // Building the map above is target independent.  Generating DBG_VALUE
     // inline is target dependent; do this now.
     (void)TargetSelectInstruction(cast<Instruction>(I));

lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

@@ -3800,7 +3800,7 @@ SelectionDAGBuilder::visitIntrinsicCall(CallInst &I, unsigned Intrinsic) {
     int FI = SI->second;
 
     if (MachineModuleInfo *MMI = DAG.getMachineModuleInfo())
-      if (MDNode *Dbg = DI.getMetadata("dbg"))
+      if (MDNode *Dbg = DI.getDbgMetadata())
         MMI->setVariableDbgInfo(Variable, FI, Dbg);
     return 0;
   }
@@ -3852,7 +3852,7 @@ SelectionDAGBuilder::visitIntrinsicCall(CallInst &I, unsigned Intrinsic) {
       return 0; // VLAs.
     int FI = SI->second;
     if (MachineModuleInfo *MMI = DAG.getMachineModuleInfo())
-      if (MDNode *Dbg = DI.getMetadata("dbg"))
+      if (MDNode *Dbg = DI.getDbgMetadata())
         MMI->setVariableDbgInfo(Variable, FI, Dbg);
     return 0;
   }

lib/VMCore/Metadata.cpp

@@ -424,6 +424,10 @@ MDNode *Instruction::getMetadataImpl(const char *Kind) const {
   return getMetadataImpl(getContext().getMDKindID(Kind));
 }
 
+void Instruction::setDbgMetadata(MDNode *Node) {
+  DbgInfo = Node;
+}
+
 /// setMetadata - Set the metadata of of the specified kind to the specified
 /// node.  This updates/replaces metadata if already present, or removes it if
 /// Node is null.