Add some new bits of debug info handling. No

functional change yet.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97855 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/SelectionDAG/SDDbgValue.h

@@ -0,0 +1,67 @@
+//===-- llvm/CodeGen/SDDbgValue.h - SD dbg_value handling--------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the SDDbgValue class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_SDDBGVALUE_H
+#define LLVM_CODEGEN_SDDBGVALUE_H
+
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/Support/DebugLoc.h"
+
+namespace llvm {
+
+class MDNode;
+class SDNode;
+class Value;
+
+/// SDDbgValue - Holds the information from a dbg_value node through SDISel.
+/// Either Const or Node is nonzero, but not both.
+/// We do not use SDValue here to avoid including its header.
+
+class SDDbgValue {
+  SDNode *Node;           // valid for non-constants
+  unsigned ResNo;         // valid for non-constants
+  Value *Const;           // valid for constants
+  MDNode *mdPtr;
+  uint64_t Offset;
+  DebugLoc DL;
+public:
+  // Constructor for non-constants.
+  SDDbgValue(MDNode *mdP, SDNode *N, unsigned R, uint64_t off, DebugLoc dl) :
+    Node(N), ResNo(R), Const(0), mdPtr(mdP), Offset(off), DL(dl) {}
+
+  // Constructor for constants.
+  SDDbgValue(MDNode *mdP, Value *C, uint64_t off, DebugLoc dl) : Node(0),
+    ResNo(0), Const(C), mdPtr(mdP), Offset(off), DL(dl) {}
+
+  // Returns the MDNode pointer.
+  MDNode *getMDPtr() { return mdPtr; }
+
+  // Returns the SDNode* (valid for non-constants only).
+  SDNode *getSDNode() { assert (!Const); return Node; }
+
+  // Returns the ResNo (valid for non-constants only).
+  unsigned getResNo() { assert (!Const); return ResNo; }
+
+  // Returns the Value* for a constant (invalid for non-constants).
+  Value *getConst() { assert (!Node); return Const; }
+
+  // Returns the offset.
+  uint64_t getOffset() { return Offset; }
+
+  // Returns the DebugLoc.
+  DebugLoc getDebugLoc() { return DL; }
+};
+
+} // end llvm namespace
+
+#endif