MDNodes are not expected to disappear or replaced by another MDNode, so there is no need to pay the cost of WeakVH and ValueMaps.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93865 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 16 insertions, 15 deletions

diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 138e974881..b9910c35ba 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -56,12 +56,12 @@ class CompileUnit {
   /// GVToDieMap - Tracks the mapping of unit level debug informaton
   /// variables to debug information entries.
   /// FIXME : Rename GVToDieMap -> NodeToDieMap
-  ValueMap<MDNode *, DIE *> GVToDieMap;
+  DenseMap<MDNode *, DIE *> GVToDieMap;
 
   /// GVToDIEEntryMap - Tracks the mapping of unit level debug informaton
   /// descriptors to debug information entries using a DIEEntry proxy.
   /// FIXME : Rename
-  ValueMap<MDNode *, DIEEntry *> GVToDIEEntryMap;
+  DenseMap<MDNode *, DIEEntry *> GVToDIEEntryMap;
 
   /// Globals - A map of globally visible named entities for this unit.
   ///
@@ -108,7 +108,7 @@ public:
   /// getDIEEntry - Returns the debug information entry for the speciefied
   /// debug variable.
   DIEEntry *getDIEEntry(MDNode *N) { 
-    ValueMap<MDNode *, DIEEntry *>::iterator I = GVToDIEEntryMap.find(N);
+    DenseMap<MDNode *, DIEEntry *>::iterator I = GVToDIEEntryMap.find(N);
     if (I == GVToDIEEntryMap.end())
       return NULL;
     return I->second;
@@ -1162,7 +1162,8 @@ DIE *DwarfDebug::createSubprogramDIE(const DISubprogram &SP, bool MakeDecl) {
     addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
     addUInt(Block, 0, dwarf::DW_FORM_data1, SP.getVirtualIndex());
     addBlock(SPDie, dwarf::DW_AT_vtable_elem_location, 0, Block);
-    ContainingTypeMap.insert(std::make_pair(SPDie, WeakVH(SP.getContainingType().getNode())));
+    ContainingTypeMap.insert(std::make_pair(SPDie, 
+                                            SP.getContainingType().getNode()));
   }
 
   if (MakeDecl || !SP.isDefinition()) {
@@ -1379,7 +1380,7 @@ DIE *DwarfDebug::constructInlinedScopeDIE(DbgScope *Scope) {
   InlinedSubprogramDIEs.insert(OriginDIE);
 
   // Track the start label for this inlined function.
-  ValueMap<MDNode *, SmallVector<InlineInfoLabels, 4> >::iterator
+  DenseMap<MDNode *, SmallVector<InlineInfoLabels, 4> >::iterator
     I = InlineInfo.find(InlinedSP.getNode());
 
   if (I == InlineInfo.end()) {
@@ -1808,7 +1809,7 @@ void DwarfDebug::endModule() {
          TE = TopLevelDIEsVector.end(); TI != TE; ++TI)
     ModuleCU->getCUDie()->addChild(*TI);
 
-  for (DenseMap<DIE *, WeakVH>::iterator CI = ContainingTypeMap.begin(),
+  for (DenseMap<DIE *, MDNode *>::iterator CI = ContainingTypeMap.begin(),
          CE = ContainingTypeMap.end(); CI != CE; ++CI) {
     DIE *SPDie = CI->first;
     MDNode *N = dyn_cast_or_null<MDNode>(CI->second);
@@ -2042,7 +2043,7 @@ bool DwarfDebug::extractScopeInformation(MachineFunction *MF) {
   // and end of a scope respectively. Create an inverse map that list scopes
   // starts (and ends) with an instruction. One instruction may start (or end)
   // multiple scopes.
-  for (ValueMap<MDNode *, DbgScope *>::iterator DI = DbgScopeMap.begin(),
+  for (DenseMap<MDNode *, DbgScope *>::iterator DI = DbgScopeMap.begin(),
 	 DE = DbgScopeMap.end(); DI != DE; ++DI) {
     DbgScope *S = DI->second;
     if (S->isAbstractScope())
@@ -2922,7 +2923,7 @@ void DwarfDebug::emitDebugInlineInfo() {
          E = InlinedSPNodes.end(); I != E; ++I) {
 
     MDNode *Node = *I;
-    ValueMap<MDNode *, SmallVector<InlineInfoLabels, 4> >::iterator II
+    DenseMap<MDNode *, SmallVector<InlineInfoLabels, 4> >::iterator II
       = InlineInfo.find(Node);
     SmallVector<InlineInfoLabels, 4> &Labels = II->second;
     DISubprogram SP(Node);
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.h b/lib/CodeGen/AsmPrinter/DwarfDebug.h
index 950f40d69b..fb6cb1ce29 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.h
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -20,7 +20,7 @@
 #include "llvm/CodeGen/MachineLocation.h"
 #include "llvm/Analysis/DebugInfo.h"
 #include "llvm/Support/raw_ostream.h"
-#include "llvm/ADT/ValueMap.h"
+#include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/FoldingSet.h"
 #include "llvm/ADT/SmallSet.h"
 #include "llvm/ADT/StringMap.h"
@@ -136,25 +136,25 @@ class DwarfDebug : public Dwarf {
   
   /// DbgScopeMap - Tracks the scopes in the current function.
   ///
-  ValueMap<MDNode *, DbgScope *> DbgScopeMap;
+  DenseMap<MDNode *, DbgScope *> DbgScopeMap;
 
   /// ConcreteScopes - Tracks the concrete scopees in the current function.
   /// These scopes are also included in DbgScopeMap.
-  ValueMap<MDNode *, DbgScope *> ConcreteScopes;
+  DenseMap<MDNode *, DbgScope *> ConcreteScopes;
 
   /// AbstractScopes - Tracks the abstract scopes a module. These scopes are
   /// not included DbgScopeMap.
-  ValueMap<MDNode *, DbgScope *> AbstractScopes;
+  DenseMap<MDNode *, DbgScope *> AbstractScopes;
   SmallVector<DbgScope *, 4>AbstractScopesList;
 
   /// AbstractVariables - Collection on abstract variables.
-  ValueMap<MDNode *, DbgVariable *> AbstractVariables;
+  DenseMap<MDNode *, DbgVariable *> AbstractVariables;
 
   /// InliendSubprogramDIEs - Collection of subprgram DIEs that are marked
   /// (at the end of the module) as DW_AT_inline.
   SmallPtrSet<DIE *, 4> InlinedSubprogramDIEs;
 
-  DenseMap<DIE *, WeakVH> ContainingTypeMap;
+  DenseMap<DIE *, MDNode *> ContainingTypeMap;
 
   /// AbstractSubprogramDIEs - Collection of abstruct subprogram DIEs.
   SmallPtrSet<DIE *, 4> AbstractSubprogramDIEs;
@@ -176,7 +176,7 @@ class DwarfDebug : public Dwarf {
   /// InlineInfo - Keep track of inlined functions and their location.  This
   /// information is used to populate debug_inlined section.
   typedef std::pair<unsigned, DIE *> InlineInfoLabels;
-  ValueMap<MDNode *, SmallVector<InlineInfoLabels, 4> > InlineInfo;
+  DenseMap<MDNode *, SmallVector<InlineInfoLabels, 4> > InlineInfo;
   SmallVector<MDNode *, 4> InlinedSPNodes;
 
   /// CompileUnitOffsets - A vector of the offsets of the compile units. This is