Added initial support for DEBUG_LABEL allowing debug specific labels to be

inserted in the code.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25104 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 19 insertions, 6 deletions

diff --git a/include/llvm/CodeGen/DwarfWriter.h b/include/llvm/CodeGen/DwarfWriter.h
index 11e5623b0d..1a7c5a5666 100644
--- a/include/llvm/CodeGen/DwarfWriter.h
+++ b/include/llvm/CodeGen/DwarfWriter.h
@@ -550,8 +550,9 @@ namespace llvm {
     ///
     void EmitInitial() const;
     
-    /// ShouldEmitDwarf - Determine if dwarf declarations should be made.
-    ///
+    /// ShouldEmitDwarf - Returns true if dwarf declarations should be made.
+    /// When called it also checks to see if debug info is newly available.  if
+    /// so the initial dwarf headers are emitted.
     bool ShouldEmitDwarf();
 
     /// BeginModule - Emit all dwarf sections that should come prior to the
diff --git a/include/llvm/CodeGen/MachineDebugInfo.h b/include/llvm/CodeGen/MachineDebugInfo.h
index c728418a89..039bdbc0d5 100644
--- a/include/llvm/CodeGen/MachineDebugInfo.h
+++ b/include/llvm/CodeGen/MachineDebugInfo.h
@@ -52,6 +52,13 @@ public:
   ///
   unsigned getNextUniqueID() { return UniqueID++; }
   
+  /// RecordLabel - Records location information and associates it with a
+  /// debug label.  Returns unique label id.
+  unsigned RecordLabel(unsigned Line, unsigned Col, unsigned SrcFile) {
+    // FIXME - actually record.
+    return getNextUniqueID();
+  }
+  
   bool doInitialization();
   bool doFinalization();
   
diff --git a/include/llvm/CodeGen/SelectionDAGNodes.h b/include/llvm/CodeGen/SelectionDAGNodes.h
index 800ad3932b..124da2e6cd 100644
--- a/include/llvm/CodeGen/SelectionDAGNodes.h
+++ b/include/llvm/CodeGen/SelectionDAGNodes.h
@@ -355,12 +355,17 @@ namespace ISD {
     LOCATION,
     
     // DEBUG_LOC - This node is used to represent source line information
-    // embedded in the code.  It takes token chain as input, then a line number,
-    // then a column then a file id (provided by MachineDebugInfo), then a
-    // unique id (provided by MachineDebugInfo for label gen).  It produces a
-    // token chain as output.
+    // embedded in the code.  It takes a token chain as input, then a line
+    // number, then a column then a file id (provided by MachineDebugInfo.) It
+    // produces a token chain as output.
     DEBUG_LOC,
     
+    // DEBUG_LABEL - This node is used to mark a location in the code where a
+    // label should be generated for use by the debug information.  It takes a
+    // token chain as input, the a unique id (provided by MachineDebugInfo.) It
+    // produces a token chain as output.
+    DEBUG_LABEL,
+    
     // BUILTIN_OP_END - This must be the last enum value in this list.
     BUILTIN_OP_END,
   };