Don't bother creating LabelBegin for .dwo units

[oota-llvm.git] / lib / CodeGen / AsmPrinter / DwarfCompileUnit.h

diff --git a/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h b/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
index f0799304316e912543e671f09fb295535445e055..27ed6fc1431816ca7f14e99d76a96e3690002948 100644 (file)
--- a/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
+++ b/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
@@ -36,6 +36,12 @@ class DwarfCompileUnit : public DwarfUnit {
   /// Skeleton unit associated with this unit.
   DwarfCompileUnit *Skeleton;
 
+  /// A label at the start of the non-dwo section related to this unit.
+  MCSymbol *SectionSym;
+
+  /// The start of the unit within its section.
+  MCSymbol *LabelBegin;
+
   /// \brief Construct a DIE for the given DbgVariable without initializing the
   /// DbgVariable's DIE reference.
   std::unique_ptr<DIE> constructVariableDIEImpl(const DbgVariable &DV,
@@ -138,24 +144,38 @@ public:
 
   void collectDeadVariables(DISubprogram SP);
 
-  /// If there's a skeleton then return the begin label for the skeleton unit,
-  /// otherwise return the local label for this unit.
-  MCSymbol *getLocalLabelBegin() const {
-    if (Skeleton)
-      return Skeleton->getLabelBegin();
-    return getLabelBegin();
+  /// Set the skeleton unit associated with this unit.
+  void setSkeleton(DwarfCompileUnit &Skel) { Skeleton = &Skel; }
+
+  MCSymbol *getSectionSym() const {
+    assert(Section);
+    return SectionSym;
   }
 
-  /// If there's a skeleton then return the section symbol for the skeleton
-  /// unit, otherwise return the section symbol for this unit.
-  MCSymbol *getLocalSectionSym() const {
-    if (Skeleton)
-      return Skeleton->getSectionSym();
-    return getSectionSym();
+  /// Pass in the SectionSym even though we could recreate it in every compile
+  /// unit (type units will have actually distinct symbols once they're in
+  /// comdat sections).
+  void initSection(const MCSection *Section, MCSymbol *SectionSym) {
+    DwarfUnit::initSection(Section);
+    this->SectionSym = SectionSym;
+
+    // Don't bother labeling the .dwo unit, as its offset isn't used.
+    if (!Skeleton)
+      LabelBegin =
+          Asm->GetTempSymbol(Section->getLabelBeginName(), getUniqueID());
   }
 
-  /// Set the skeleton unit associated with this unit.
-  void setSkeleton(DwarfCompileUnit &Skel) { Skeleton = &Skel; }
+  unsigned getLength() {
+    return sizeof(uint32_t) + // Length field
+        getHeaderSize() + UnitDie.getSize();
+  }
+
+  void emitHeader(const MCSymbol *ASectionSym) const override;
+
+  MCSymbol *getLabelBegin() const {
+    assert(Section);
+    return LabelBegin;
+  }
 };
 
 } // end llvm namespace