First cut at supporting .debug_loc section.

This is used to track variable information.

llvm-svn: 104649

1 files changed, 31 insertions, 4 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
index 6728199c5eb..781302e9998 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -15,6 +15,7 @@
 #define CODEGEN_ASMPRINTER_DWARFDEBUG_H__
 
 #include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/MachineLocation.h"
 #include "DIE.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/FoldingSet.h"
@@ -30,7 +31,6 @@ class DbgConcreteScope;
 class DbgScope;
 class DbgVariable;
 class MachineFrameInfo;
-class MachineLocation;
 class MachineModuleInfo;
 class MachineOperand;
 class MCAsmInfo;
@@ -181,6 +181,27 @@ class DwarfDebug {
   /// DbgVariableLabelsMap - Maps DbgVariable to corresponding MCSymbol.
   DenseMap<const DbgVariable *, const MCSymbol *> DbgVariableLabelsMap;
 
+  /// DotDebugLocEntry - This struct describes location entries emitted in
+  /// .debug_loc section.
+  typedef struct DotDebugLocEntry {
+    const MCSymbol *Begin;
+    const MCSymbol *End;
+    MachineLocation Loc;
+    DotDebugLocEntry() : Begin(0), End(0) {}
+    DotDebugLocEntry(const MCSymbol *B, const MCSymbol *E, 
+                  MachineLocation &L) : Begin(B), End(E), Loc(L) {}
+    /// 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() { return Begin == 0 && End == 0; }
+  } DotDebugLocEntry;
+
+  /// DotDebugLocEntries - Collection of DotDebugLocEntry.
+  SmallVector<DotDebugLocEntry, 4> DotDebugLocEntries;
+
+  /// UseDotDebugLocEntry - DW_AT_location attributes for the DIEs in this set
+  /// idetifies corresponding .debug_loc entry offset.
+  SmallPtrSet<const DIE *, 4> UseDotDebugLocEntry;
+
   /// VarToAbstractVarMap - Maps DbgVariable with corresponding Abstract
   /// DbgVariable, if any.
   DenseMap<const DbgVariable *, const DbgVariable *> VarToAbstractVarMap;
@@ -200,7 +221,7 @@ class DwarfDebug {
 
   /// InlineInfo - Keep track of inlined functions and their location.  This
   /// information is used to populate debug_inlined section.
-  typedef std::pair<MCSymbol *, DIE *> InlineInfoLabels;
+  typedef std::pair<const MCSymbol *, DIE *> InlineInfoLabels;
   DenseMap<const MDNode *, SmallVector<InlineInfoLabels, 4> > InlineInfo;
   SmallVector<const MDNode *, 4> InlinedSPNodes;
 
@@ -234,8 +255,8 @@ class DwarfDebug {
   // section offsets and are created by EmitSectionLabels.
   MCSymbol *DwarfFrameSectionSym, *DwarfInfoSectionSym, *DwarfAbbrevSectionSym;
   MCSymbol *DwarfStrSectionSym, *TextSectionSym, *DwarfDebugRangeSectionSym;
-
-  MCSymbol *FunctionBeginSym;
+  MCSymbol *DwarfDebugLocSectionSym;
+  MCSymbol *FunctionBeginSym, *FunctionEndSym;
 private:
   
   /// getSourceDirectoryAndFileIds - Return the directory and file ids that
@@ -600,6 +621,12 @@ public:
   ///
   void endFunction(const MachineFunction *MF);
 
+  /// getLabelBeforeInsn - Return Label preceding the instruction.
+  const MCSymbol *getLabelBeforeInsn(const MachineInstr *MI);
+
+  /// getLabelAfterInsn - Return Label immediately following the instruction.
+  const MCSymbol *getLabelAfterInsn(const MachineInstr *MI);
+
   /// beginScope - Process beginning of a scope.
   void beginScope(const MachineInstr *MI);