Use std::unique_ptr for DIE children

Got bored, removed some manual memory management.

Pushed references (rather than pointers) through a few APIs rather than
replacing *x with x.get().

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206222 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/AsmPrinter/DIE.cpp

@@ -104,15 +104,6 @@ void DIEAbbrev::print(raw_ostream &O) {
 void DIEAbbrev::dump() { print(dbgs()); }
 #endif
 
-//===----------------------------------------------------------------------===//
-// DIE Implementation
-//===----------------------------------------------------------------------===//
-
-DIE::~DIE() {
-  for (unsigned i = 0, N = Children.size(); i < N; ++i)
-    delete Children[i];
-}
-
 /// Climb up the parent chain to get the unit DIE to which this DIE
 /// belongs.
 const DIE *DIE::getUnit() const {

lib/CodeGen/AsmPrinter/DIE.h

@@ -124,7 +124,7 @@ protected:
 
   /// Children DIEs.
   ///
-  std::vector<DIE *> Children;
+  std::vector<std::unique_ptr<DIE>> Children;
 
   DIE *Parent;
 
@@ -141,7 +141,6 @@ public:
   explicit DIE(dwarf::Tag Tag)
       : Offset(0), Size(0), Abbrev((dwarf::Tag)Tag, dwarf::DW_CHILDREN_no),
         Parent(0) {}
-  ~DIE();
 
   // Accessors.
   DIEAbbrev &getAbbrev() { return Abbrev; }
@@ -150,7 +149,9 @@ public:
   dwarf::Tag getTag() const { return Abbrev.getTag(); }
   unsigned getOffset() const { return Offset; }
   unsigned getSize() const { return Size; }
-  const std::vector<DIE *> &getChildren() const { return Children; }
+  const std::vector<std::unique_ptr<DIE>> &getChildren() const {
+    return Children;
+  }
   const SmallVectorImpl<DIEValue *> &getValues() const { return Values; }
   DIE *getParent() const { return Parent; }
   /// Climb up the parent chain to get the compile or type unit DIE this DIE
@@ -174,7 +175,7 @@ public:
   void addChild(DIE *Child) {
     assert(!Child->getParent());
     Abbrev.setChildrenFlag(dwarf::DW_CHILDREN_yes);
-    Children.push_back(Child);
+    Children.push_back(std::unique_ptr<DIE>(Child));
     Child->Parent = this;
   }
 

lib/CodeGen/AsmPrinter/DIEHash.cpp

@@ -463,20 +463,18 @@ void DIEHash::computeHash(const DIE &Die) {
   addAttributes(Die);
 
   // Then hash each of the children of the DIE.
-  for (std::vector<DIE *>::const_iterator I = Die.getChildren().begin(),
-                                          E = Die.getChildren().end();
-       I != E; ++I) {
+  for (auto &C : Die.getChildren()) {
     // 7.27 Step 7
     // If C is a nested type entry or a member function entry, ...
-    if (isType((*I)->getTag()) || (*I)->getTag() == dwarf::DW_TAG_subprogram) {
-      StringRef Name = getDIEStringAttr(**I, dwarf::DW_AT_name);
+    if (isType(C->getTag()) || C->getTag() == dwarf::DW_TAG_subprogram) {
+      StringRef Name = getDIEStringAttr(*C, dwarf::DW_AT_name);
       // ... and has a DW_AT_name attribute
       if (!Name.empty()) {
-        hashNestedType(**I, Name);
+        hashNestedType(*C, Name);
         continue;
       }
     }
-    computeHash(**I);
+    computeHash(*C);
   }
 
   // Following the last (or if there are no children), append a zero byte.

lib/CodeGen/AsmPrinter/DwarfDebug.cpp

@@ -1798,20 +1798,20 @@ void DwarfDebug::recordSourceLine(unsigned Line, unsigned Col, const MDNode *S,
 
 // Compute the size and offset of a DIE. The offset is relative to start of the
 // CU. It returns the offset after laying out the DIE.
-unsigned DwarfFile::computeSizeAndOffset(DIE *Die, unsigned Offset) {
+unsigned DwarfFile::computeSizeAndOffset(DIE &Die, unsigned Offset) {
   // Record the abbreviation.
-  assignAbbrevNumber(Die->getAbbrev());
+  assignAbbrevNumber(Die.getAbbrev());
 
   // Get the abbreviation for this DIE.
-  const DIEAbbrev &Abbrev = Die->getAbbrev();
+  const DIEAbbrev &Abbrev = Die.getAbbrev();
 
   // Set DIE offset
-  Die->setOffset(Offset);
+  Die.setOffset(Offset);
 
   // Start the size with the size of abbreviation code.
-  Offset += getULEB128Size(Die->getAbbrevNumber());
+  Offset += getULEB128Size(Die.getAbbrevNumber());
 
-  const SmallVectorImpl<DIEValue *> &Values = Die->getValues();
+  const SmallVectorImpl<DIEValue *> &Values = Die.getValues();
   const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
 
   // Size the DIE attribute values.
@@ -1820,20 +1820,20 @@ unsigned DwarfFile::computeSizeAndOffset(DIE *Die, unsigned Offset) {
     Offset += Values[i]->SizeOf(Asm, AbbrevData[i].getForm());
 
   // Get the children.
-  const std::vector<DIE *> &Children = Die->getChildren();
+  const auto &Children = Die.getChildren();
 
   // Size the DIE children if any.
   if (!Children.empty()) {
     assert(Abbrev.hasChildren() && "Children flag not set");
 
-    for (DIE *Child : Children)
-      Offset = computeSizeAndOffset(Child, Offset);
+    for (auto &Child : Children)
+      Offset = computeSizeAndOffset(*Child, Offset);
 
     // End of children marker.
     Offset += sizeof(int8_t);
   }
 
-  Die->setSize(Offset - Die->getOffset());
+  Die.setSize(Offset - Die.getOffset());
   return Offset;
 }
 
@@ -1853,7 +1853,7 @@ void DwarfFile::computeSizeAndOffsets() {
 
     // EndOffset here is CU-relative, after laying out
     // all of the CU DIE.
-    unsigned EndOffset = computeSizeAndOffset(TheU->getUnitDie(), Offset);
+    unsigned EndOffset = computeSizeAndOffset(*TheU->getUnitDie(), Offset);
     SecOffset += EndOffset;
   }
 }
@@ -1905,19 +1905,19 @@ void DwarfDebug::emitSectionLabels() {
 }
 
 // Recursively emits a debug information entry.
-void DwarfDebug::emitDIE(DIE *Die) {
+void DwarfDebug::emitDIE(DIE &Die) {
   // Get the abbreviation for this DIE.
-  const DIEAbbrev &Abbrev = Die->getAbbrev();
+  const DIEAbbrev &Abbrev = Die.getAbbrev();
 
   // Emit the code (index) for the abbreviation.
   if (Asm->isVerbose())
     Asm->OutStreamer.AddComment("Abbrev [" + Twine(Abbrev.getNumber()) +
-                                "] 0x" + Twine::utohexstr(Die->getOffset()) +
-                                ":0x" + Twine::utohexstr(Die->getSize()) + " " +
+                                "] 0x" + Twine::utohexstr(Die.getOffset()) +
+                                ":0x" + Twine::utohexstr(Die.getSize()) + " " +
                                 dwarf::TagString(Abbrev.getTag()));
   Asm->EmitULEB128(Abbrev.getNumber());
 
-  const SmallVectorImpl<DIEValue *> &Values = Die->getValues();
+  const SmallVectorImpl<DIEValue *> &Values = Die.getValues();
   const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
 
   // Emit the DIE attribute values.
@@ -1939,10 +1939,8 @@ void DwarfDebug::emitDIE(DIE *Die) {
 
   // Emit the DIE children if any.
   if (Abbrev.hasChildren()) {
-    const std::vector<DIE *> &Children = Die->getChildren();
-
-    for (DIE *Child : Children)
-      emitDIE(Child);
+    for (auto &Child : Die.getChildren())
+      emitDIE(*Child);
 
     Asm->OutStreamer.AddComment("End Of Children Mark");
     Asm->EmitInt8(0);
@@ -1966,7 +1964,7 @@ void DwarfFile::emitUnits(DwarfDebug *DD, const MCSymbol *ASectionSym) {
 
     TheU->emitHeader(ASectionSym);
 
-    DD->emitDIE(Die);
+    DD->emitDIE(*Die);
     Asm->OutStreamer.EmitLabel(TheU->getLabelEnd());
   }
 }

lib/CodeGen/AsmPrinter/DwarfDebug.h

@@ -178,7 +178,7 @@ public:
   const SmallVectorImpl<DwarfUnit *> &getUnits() { return CUs; }
 
   /// \brief Compute the size and offset of a DIE given an incoming Offset.
-  unsigned computeSizeAndOffset(DIE *Die, unsigned Offset);
+  unsigned computeSizeAndOffset(DIE &Die, unsigned Offset);
 
   /// \brief Compute the size and offset of all the DIEs.
   void computeSizeAndOffsets();
@@ -666,7 +666,7 @@ public:
   }
 
   /// \brief Recursively Emits a debug information entry.
-  void emitDIE(DIE *Die);
+  void emitDIE(DIE &Die);
 
   // Experimental DWARF5 features.