DwarfUnit: Provide a reference to a defining DwarfCompileUnit from DwarfTypeUnit.

Type units need to insert their file strings into the compile unit's
line/file table. This is preliminary work to that end.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201196 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/AsmPrinter/DwarfDebug.cpp

@@ -2965,11 +2965,11 @@ DwarfCompileUnit *DwarfDebug::constructSkeletonCU(const DwarfCompileUnit *CU) {
 
 // This DIE has the following attributes: DW_AT_comp_dir, DW_AT_dwo_name,
 // DW_AT_addr_base.
-DwarfTypeUnit *DwarfDebug::constructSkeletonTU(const DwarfTypeUnit *TU) {
+DwarfTypeUnit *DwarfDebug::constructSkeletonTU(DwarfTypeUnit *TU) {
 
   DIE *Die = new DIE(dwarf::DW_TAG_type_unit);
   DwarfTypeUnit *NewTU = new DwarfTypeUnit(
-      TU->getUniqueID(), Die, TU->getCUNode(), Asm, this, &SkeletonHolder);
+      TU->getUniqueID(), Die, TU->getCU(), Asm, this, &SkeletonHolder);
   NewTU->setTypeSignature(TU->getTypeSignature());
   NewTU->setType(NULL);
   NewTU->initSection(
@@ -3007,29 +3007,29 @@ void DwarfDebug::emitDebugStrDWO() {
                          OffSec, StrSym);
 }
 
-void DwarfDebug::addDwarfTypeUnitType(DICompileUnit CUNode,
+void DwarfDebug::addDwarfTypeUnitType(DwarfCompileUnit &CU,
                                       StringRef Identifier, DIE *RefDie,
                                       DICompositeType CTy) {
   // Flag the type unit reference as a declaration so that if it contains
   // members (implicit special members, static data member definitions, member
   // declarations for definitions in this CU, etc) consumers don't get confused
   // and think this is a full definition.
-  CUMap.begin()->second->addFlag(RefDie, dwarf::DW_AT_declaration);
+  CU.addFlag(RefDie, dwarf::DW_AT_declaration);
 
   const DwarfTypeUnit *&TU = DwarfTypeUnits[CTy];
   if (TU) {
-    CUMap.begin()->second->addDIETypeSignature(RefDie, *TU);
+    CU.addDIETypeSignature(RefDie, *TU);
     return;
   }
 
   DIE *UnitDie = new DIE(dwarf::DW_TAG_type_unit);
   DwarfTypeUnit *NewTU = new DwarfTypeUnit(
-      InfoHolder.getUnits().size(), UnitDie, CUNode, Asm, this, &InfoHolder);
+      InfoHolder.getUnits().size(), UnitDie, CU, Asm, this, &InfoHolder);
   TU = NewTU;
   InfoHolder.addUnit(NewTU);
 
   NewTU->addUInt(UnitDie, dwarf::DW_AT_language, dwarf::DW_FORM_data2,
-                 CUNode.getLanguage());
+                 CU.getLanguage());
 
   MD5 Hash;
   Hash.update(Identifier);
@@ -3050,5 +3050,5 @@ void DwarfDebug::addDwarfTypeUnitType(DICompileUnit CUNode,
           ? Asm->getObjFileLowering().getDwarfTypesDWOSection(Signature)
           : Asm->getObjFileLowering().getDwarfTypesSection(Signature));
 
-  CUMap.begin()->second->addDIETypeSignature(RefDie, *NewTU);
+  CU.addDIETypeSignature(RefDie, *NewTU);
 }

lib/CodeGen/AsmPrinter/DwarfDebug.h

@@ -606,7 +606,7 @@ class DwarfDebug : public AsmPrinterHandler {
 
   /// \brief Construct the split debug info compile unit for the debug info
   /// section.
-  DwarfTypeUnit *constructSkeletonTU(const DwarfTypeUnit *TU);
+  DwarfTypeUnit *constructSkeletonTU(DwarfTypeUnit *TU);
 
   /// \brief Emit the debug info dwo section.
   void emitDebugInfoDWO();
@@ -710,7 +710,7 @@ public:
 
   /// \brief Add a DIE to the set of types that we're going to pull into
   /// type units.
-  void addDwarfTypeUnitType(DICompileUnit CUNode, StringRef Identifier,
+  void addDwarfTypeUnitType(DwarfCompileUnit &CU, StringRef Identifier,
                             DIE *Die, DICompositeType CTy);
 
   /// \brief Add a label so that arange data can be generated for it.

lib/CodeGen/AsmPrinter/DwarfUnit.cpp

@@ -55,9 +55,11 @@ DwarfCompileUnit::DwarfCompileUnit(unsigned UID, DIE *D, DICompileUnit Node,
   insertDIE(Node, D);
 }
 
-DwarfTypeUnit::DwarfTypeUnit(unsigned UID, DIE *D, DICompileUnit CUNode,
+DwarfTypeUnit::DwarfTypeUnit(unsigned UID, DIE *D, DwarfCompileUnit &CU,
                              AsmPrinter *A, DwarfDebug *DW, DwarfFile *DWU)
-    : DwarfUnit(UID, D, CUNode, A, DW, DWU) {}
+    : DwarfUnit(UID, D, CU.getCUNode(), A, DW, DWU), CU(CU) {
+  (void)CU;
+}
 
 /// ~Unit - Destructor for compile unit.
 DwarfUnit::~DwarfUnit() {
@@ -944,7 +946,7 @@ DIE *DwarfUnit::getOrCreateTypeDIE(const MDNode *TyNode) {
     DICompositeType CTy(Ty);
     if (GenerateDwarfTypeUnits && !Ty.isForwardDecl())
       if (MDString *TypeId = CTy.getIdentifier()) {
-        DD->addDwarfTypeUnitType(getCUNode(), TypeId->getString(), TyDIE, CTy);
+        DD->addDwarfTypeUnitType(getCU(), TypeId->getString(), TyDIE, CTy);
         // Skip updating the accellerator tables since this is not the full type
         return TyDIE;
       }

lib/CodeGen/AsmPrinter/DwarfUnit.h

@@ -31,6 +31,7 @@ class MachineOperand;
 class ConstantInt;
 class ConstantFP;
 class DbgVariable;
+class DwarfCompileUnit;
 
 // Data structure to hold a range for range lists.
 class RangeSpan {
@@ -462,6 +463,7 @@ public:
   virtual void emitHeader(const MCSection *ASection,
                           const MCSymbol *ASectionSym) const;
 
+  virtual DwarfCompileUnit &getCU() = 0;
 protected:
   /// getOrCreateStaticMemberDIE - Create new static data member DIE.
   DIE *getOrCreateStaticMemberDIE(DIDerivedType DT);
@@ -547,15 +549,20 @@ public:
   /// addLabelAddress - Add a dwarf label attribute data and value using
   /// either DW_FORM_addr or DW_FORM_GNU_addr_index.
   void addLabelAddress(DIE *Die, dwarf::Attribute Attribute, MCSymbol *Label);
+
+  DwarfCompileUnit &getCU() LLVM_OVERRIDE {
+    return *this;
+  }
 };
 
 class DwarfTypeUnit : public DwarfUnit {
 private:
   uint64_t TypeSignature;
   const DIE *Ty;
+  DwarfCompileUnit &CU;
 
 public:
-  DwarfTypeUnit(unsigned UID, DIE *D, DICompileUnit CUNode, AsmPrinter *A,
+  DwarfTypeUnit(unsigned UID, DIE *D, DwarfCompileUnit &CU, AsmPrinter *A,
                 DwarfDebug *DW, DwarfFile *DWU);
   virtual ~DwarfTypeUnit() LLVM_OVERRIDE;
 
@@ -571,6 +578,9 @@ public:
            sizeof(uint32_t);                               // Type DIE Offset
   }
   void initSection(const MCSection *Section);
+  DwarfCompileUnit &getCU() LLVM_OVERRIDE {
+    return CU;
+  }
 };
 } // end llvm namespace
 #endif