From: David Blaikie <dblaikie@gmail.com>
Date: Thu, 5 Dec 2013 07:43:55 +0000 (+0000)
Subject: DwarfDebug/DwarfUnit: Push abbreviation structures down into DwarfUnits to reduce... 
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=0d668218e789b9043c122d559dcb88ea23ae4748;p=oota-llvm.git

DwarfDebug/DwarfUnit: Push abbreviation structures down into DwarfUnits to reduce duplication

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196479 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 0d8a2b436a2..55d13c26b35 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -114,10 +114,6 @@ static const char *const DbgTimerName = "DWARF Debug Writer";
 
 //===----------------------------------------------------------------------===//
 
-// Configuration values for initial hash set sizes (log2).
-//
-static const unsigned InitAbbreviationsSetSize = 9; // log2(512)
-
 namespace llvm {
 
 /// resolve - Look in the DwarfDebug map for the MDNode that
@@ -182,14 +178,10 @@ static unsigned getDwarfVersionFromModule(const Module *M) {
 }
 
 DwarfDebug::DwarfDebug(AsmPrinter *A, Module *M)
-    : Asm(A), MMI(Asm->MMI), FirstCU(0),
-      AbbreviationsSet(InitAbbreviationsSetSize),
-      SourceIdMap(DIEValueAllocator), PrevLabel(NULL), GlobalCUIndexCount(0),
-      GlobalRangeCount(0), InfoHolder(A, &AbbreviationsSet, Abbreviations,
-                                      "info_string", DIEValueAllocator),
-      SkeletonAbbrevSet(InitAbbreviationsSetSize),
-      SkeletonHolder(A, &SkeletonAbbrevSet, SkeletonAbbrevs, "skel_string",
-                     DIEValueAllocator) {
+    : Asm(A), MMI(Asm->MMI), FirstCU(0), SourceIdMap(DIEValueAllocator),
+      PrevLabel(NULL), GlobalCUIndexCount(0), GlobalRangeCount(0),
+      InfoHolder(A, "info_string", DIEValueAllocator),
+      SkeletonHolder(A, "skel_string", DIEValueAllocator) {
 
   DwarfInfoSectionSym = DwarfAbbrevSectionSym = 0;
   DwarfStrSectionSym = TextSectionSym = 0;
@@ -288,7 +280,7 @@ unsigned DwarfUnits::getAddrPoolIndex(const MCExpr *Sym) {
 //
 void DwarfUnits::assignAbbrevNumber(DIEAbbrev &Abbrev) {
   // Check the set for priors.
-  DIEAbbrev *InSet = AbbreviationsSet->GetOrInsertNode(&Abbrev);
+  DIEAbbrev *InSet = AbbreviationsSet.GetOrInsertNode(&Abbrev);
 
   // If it's newly added.
   if (InSet == &Abbrev) {
@@ -2162,25 +2154,21 @@ void DwarfDebug::emitDebugInfo() {
 
 // Emit the abbreviation section.
 void DwarfDebug::emitAbbreviations() {
-  if (!useSplitDwarf())
-    emitAbbrevs(Asm->getObjFileLowering().getDwarfAbbrevSection(),
-                &Abbreviations);
-  else
-    emitAbbrevs(Asm->getObjFileLowering().getDwarfAbbrevSection(),
-                &SkeletonAbbrevs);
+  DwarfUnits &Holder = useSplitDwarf() ? SkeletonHolder : InfoHolder;
+
+  Holder.emitAbbrevs(Asm->getObjFileLowering().getDwarfAbbrevSection());
 }
 
-void DwarfDebug::emitAbbrevs(const MCSection *Section,
-                             std::vector<DIEAbbrev *> *Abbrevs) {
+void DwarfUnits::emitAbbrevs(const MCSection *Section) {
   // Check to see if it is worth the effort.
-  if (!Abbrevs->empty()) {
+  if (!Abbreviations.empty()) {
     // Start the debug abbrev section.
     Asm->OutStreamer.SwitchSection(Section);
 
     // For each abbrevation.
-    for (unsigned i = 0, N = Abbrevs->size(); i < N; ++i) {
+    for (unsigned i = 0, N = Abbreviations.size(); i < N; ++i) {
       // Get abbreviation data
-      const DIEAbbrev *Abbrev = Abbrevs->at(i);
+      const DIEAbbrev *Abbrev = Abbreviations[i];
 
       // Emit the abbrevations code (base 1 index.)
       Asm->EmitULEB128(Abbrev->getNumber(), "Abbreviation Code");
@@ -3031,8 +3019,7 @@ void DwarfDebug::emitDebugInfoDWO() {
 // abbreviations for the .debug_info.dwo section.
 void DwarfDebug::emitDebugAbbrevDWO() {
   assert(useSplitDwarf() && "No split dwarf?");
-  emitAbbrevs(Asm->getObjFileLowering().getDwarfAbbrevDWOSection(),
-              &Abbreviations);
+  InfoHolder.emitAbbrevs(Asm->getObjFileLowering().getDwarfAbbrevDWOSection());
 }
 
 // Emit the .debug_str.dwo section for separated dwarf. This contains the
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.h b/lib/CodeGen/AsmPrinter/DwarfDebug.h
index 15778f734bf..8274ad84fb0 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.h
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -226,10 +226,10 @@ class DwarfUnits {
   AsmPrinter *Asm;
 
   // Used to uniquely define abbreviations.
-  FoldingSet<DIEAbbrev> *AbbreviationsSet;
+  FoldingSet<DIEAbbrev> AbbreviationsSet;
 
   // A list of all the unique abbreviations in use.
-  std::vector<DIEAbbrev *> &Abbreviations;
+  std::vector<DIEAbbrev *> Abbreviations;
 
   // A pointer to all units in the section.
   SmallVector<Unit *, 1> CUs;
@@ -251,12 +251,9 @@ class DwarfUnits {
   unsigned NextAddrPoolNumber;
 
 public:
-  DwarfUnits(AsmPrinter *AP, FoldingSet<DIEAbbrev> *AS,
-             std::vector<DIEAbbrev *> &A, const char *Pref,
-             BumpPtrAllocator &DA)
-      : Asm(AP), AbbreviationsSet(AS), Abbreviations(A), StringPool(DA),
-        NextStringPoolNumber(0), StringPref(Pref), AddressPool(),
-        NextAddrPoolNumber(0) {}
+  DwarfUnits(AsmPrinter *AP, const char *Pref, BumpPtrAllocator &DA)
+      : Asm(AP), StringPool(DA), NextStringPoolNumber(0), StringPref(Pref),
+        AddressPool(), NextAddrPoolNumber(0) {}
 
   ~DwarfUnits();
 
@@ -279,6 +276,9 @@ public:
   void emitUnits(DwarfDebug *DD, const MCSection *USection,
                  const MCSection *ASection, const MCSymbol *ASectionSym);
 
+  /// \brief Emit a set of abbreviations to the specific section.
+  void emitAbbrevs(const MCSection *);
+
   /// \brief Emit all of the strings to the section given.
   void emitStrings(const MCSection *StrSection, const MCSection *OffsetSection,
                    const MCSymbol *StrSecSym);
@@ -347,12 +347,6 @@ class DwarfDebug : public AsmPrinterHandler {
   /// of in CompileUnit.
   DenseMap<const MDNode *, DIE *> MDTypeNodeToDieMap;
 
-  // Used to uniquely define abbreviations.
-  FoldingSet<DIEAbbrev> AbbreviationsSet;
-
-  // A list of all the unique abbreviations in use.
-  std::vector<DIEAbbrev *> Abbreviations;
-
   // Stores the current file ID for a given compile unit.
   DenseMap <unsigned, unsigned> FileIDCUMap;
   // Source id map, i.e. CUID, source filename and directory,
@@ -485,12 +479,6 @@ class DwarfDebug : public AsmPrinterHandler {
   // original object file, rather than things that are meant
   // to be in the .dwo sections.
 
-  // Used to uniquely define abbreviations for the skeleton emission.
-  FoldingSet<DIEAbbrev> SkeletonAbbrevSet;
-
-  // A list of all the unique abbreviations in use.
-  std::vector<DIEAbbrev *> SkeletonAbbrevs;
-
   // Holder for the skeleton information.
   DwarfUnits SkeletonHolder;
 
@@ -553,9 +541,6 @@ class DwarfDebug : public AsmPrinterHandler {
   /// open.
   void endSections();
 
-  /// \brief Emit a set of abbreviations to the specific section.
-  void emitAbbrevs(const MCSection *, std::vector<DIEAbbrev*> *);
-
   /// \brief Emit the debug info section.
   void emitDebugInfo();