Simplify debug_loc.dwo handling slightly.

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

diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.h b/lib/CodeGen/AsmPrinter/DwarfDebug.h
index 73150442c677add1bf0f749f3904d54436f7d8a1..064c0fa7624b716798df6b4ea3f6a36eb259c608 100644 (file)
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.h
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -81,31 +81,34 @@ class DebugLocEntry {
   // The variable to which this location entry corresponds.
   const MDNode *Variable;
 
-  // Whether this location has been merged.
-  bool Merged;
+  // The compile unit to which this location entry is referenced by.
+  const DwarfCompileUnit *Unit;
 
 public:
-  DebugLocEntry() : Begin(0), End(0), Variable(0), Merged(false) {
+  DebugLocEntry() : Begin(0), End(0), Variable(0), Unit(0) {
     Constants.Int = 0;
   }
   DebugLocEntry(const MCSymbol *B, const MCSymbol *E, MachineLocation &L,
-                const MDNode *V)
-      : Begin(B), End(E), Loc(L), Variable(V), Merged(false) {
+                const MDNode *V, const DwarfCompileUnit *U)
+      : Begin(B), End(E), Loc(L), Variable(V), Unit(U) {
     Constants.Int = 0;
     EntryKind = E_Location;
   }
-  DebugLocEntry(const MCSymbol *B, const MCSymbol *E, int64_t i)
-      : Begin(B), End(E), Variable(0), Merged(false) {
+  DebugLocEntry(const MCSymbol *B, const MCSymbol *E, int64_t i,
+                const DwarfCompileUnit *U)
+      : Begin(B), End(E), Variable(0), Unit(U) {
     Constants.Int = i;
     EntryKind = E_Integer;
   }
-  DebugLocEntry(const MCSymbol *B, const MCSymbol *E, const ConstantFP *FPtr)
-      : Begin(B), End(E), Variable(0), Merged(false) {
+  DebugLocEntry(const MCSymbol *B, const MCSymbol *E, const ConstantFP *FPtr,
+                const DwarfCompileUnit *U)
+      : Begin(B), End(E), Variable(0), Unit(U) {
     Constants.CFP = FPtr;
     EntryKind = E_ConstantFP;
   }
-  DebugLocEntry(const MCSymbol *B, const MCSymbol *E, const ConstantInt *IPtr)
-      : Begin(B), End(E), Variable(0), Merged(false) {
+  DebugLocEntry(const MCSymbol *B, const MCSymbol *E, const ConstantInt *IPtr,
+                const DwarfCompileUnit *U)
+      : Begin(B), End(E), Variable(0), Unit(U) {
     Constants.CIP = IPtr;
     EntryKind = E_ConstantInt;
   }
@@ -113,12 +116,11 @@ public:
   /// \brief Empty entries are also used as a trigger to emit temp label. Such
   /// labels are referenced is used to find debug_loc offset for a given DIE.
   bool isEmpty() const { return Begin == 0 && End == 0; }
-  bool isMerged() const { return Merged; }
-  void Merge(DebugLocEntry *Next) {
-    if (!(Begin && Loc == Next->Loc && End == Next->Begin))
-      return;
-    Next->Begin = Begin;
-    Merged = true;
+  bool Merge(const DebugLocEntry &Next) {
+    if (!(Begin && Loc == Next.Loc && End == Next.Begin))
+      return false;
+    End = Next.End;
+    return true;
   }
   bool isLocation() const { return EntryKind == E_Location; }
   bool isInt() const { return EntryKind == E_Integer; }
@@ -130,6 +132,7 @@ public:
   const MDNode *getVariable() const { return Variable; }
   const MCSymbol *getBeginSym() const { return Begin; }
   const MCSymbol *getEndSym() const { return End; }
+  const DwarfCompileUnit *getCU() const { return Unit; }
   MachineLocation getLoc() const { return Loc; }
 };
 
@@ -264,8 +267,7 @@ public:
 
   /// \brief Emit all of the units to the section listed with the given
   /// abbreviation section.
-  void emitUnits(DwarfDebug *DD, const MCSection *ASection,
-                 const MCSymbol *ASectionSym);
+  void emitUnits(DwarfDebug *DD, const MCSymbol *ASectionSym);
 
   /// \brief Emit a set of abbreviations to the specific section.
   void emitAbbrevs(const MCSection *);
@@ -332,7 +334,7 @@ class DwarfDebug : public AsmPrinterHandler {
   // Maps a CU DIE with its corresponding DwarfCompileUnit.
   DenseMap<const DIE *, DwarfCompileUnit *> CUDieMap;
 
-  /// Maps MDNodes for type sysstem with the corresponding DIEs. These DIEs can
+  /// Maps MDNodes for type system with the corresponding DIEs. These DIEs can
   /// be shared across CUs, that is why we keep the map here instead
   /// of in DwarfCompileUnit.
   DenseMap<const MDNode *, DIE *> MDTypeNodeToDieMap;
@@ -364,7 +366,7 @@ class DwarfDebug : public AsmPrinterHandler {
   DenseMap<const MDNode *, DbgVariable *> AbstractVariables;
 
   // Collection of DebugLocEntry.
-  SmallVector<DebugLocEntry, 4> DotDebugLocEntries;
+  SmallVector<SmallVector<DebugLocEntry, 4>, 4> DotDebugLocEntries;
 
   // Collection of subprogram DIEs that are marked (at the end of the module)
   // as DW_AT_inline.
@@ -406,6 +408,13 @@ class DwarfDebug : public AsmPrinterHandler {
   // If nonnull, stores the current machine instruction we're processing.
   const MachineInstr *CurMI;
 
+  // If nonnull, stores the section that the previous function was allocated to
+  // emitting.
+  const MCSection *PrevSection;
+
+  // If nonnull, stores the CU in which the previous subprogram was contained.
+  const DwarfCompileUnit *PrevCU;
+
   // Section Symbols: these are assembler temporary labels that are emitted at
   // the beginning of each supported dwarf section.  These are used to form
   // section offsets and are created by EmitSectionLabels.
@@ -741,17 +750,21 @@ public:
   /// split dwarf proposal support.
   bool useSplitDwarf() const { return HasSplitDwarf; }
 
-  /// \brief Returns whether or not to use AT_ranges for compilation units.
-  bool useCURanges() const { return HasCURanges; }
-
   /// Returns the Dwarf Version.
   unsigned getDwarfVersion() const { return DwarfVersion; }
 
   /// Returns the section symbol for the .debug_loc section.
   MCSymbol *getDebugLocSym() const { return DwarfDebugLocSectionSym; }
 
+  /// Returns the previous section that was emitted into.
+  const MCSection *getPrevSection() const { return PrevSection; }
+
+  /// Returns the previous CU that was being updated
+  const DwarfCompileUnit *getPrevCU() const { return PrevCU; }
+
   /// Returns the entries for the .debug_loc section.
-  const SmallVectorImpl<DebugLocEntry> &getDebugLocEntries() const {
+  const SmallVectorImpl<SmallVector<DebugLocEntry, 4>> &
+  getDebugLocEntries() const {
     return DotDebugLocEntries;
   }