lib/CodeGen/SelectionDAG/SDNodeDbgValue.h

   1 //===-- llvm/CodeGen/SDNodeDbgValue.h - SelectionDAG dbg_value --*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file declares the SDDbgValue class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef LLVM_CODEGEN_SDNODEDBGVALUE_H
  15 #define LLVM_CODEGEN_SDNODEDBGVALUE_H
  16
  17 #include "llvm/ADT/SmallVector.h"
  18 #include "llvm/Support/DebugLoc.h"
  19 #include "llvm/System/DataTypes.h"
  20
  21 namespace llvm {
  22
  23 class MDNode;
  24 class SDNode;
  25 class Value;
  26
  27 /// SDDbgValue - Holds the information from a dbg_value node through SDISel.
  28 /// We do not use SDValue here to avoid including its header.
  29
  30 class SDDbgValue {
  31 public:
  32   enum DbgValueKind {
  33     SDNODE = 0,             // value is the result of an expression
  34     CONST = 1,              // value is a constant
  35     FRAMEIX = 2             // value is contents of a stack location
  36   };
  37 private:
  38   enum DbgValueKind kind;
  39   union {
  40     struct {
  41       SDNode *Node;         // valid for expressions
  42       unsigned ResNo;       // valid for expressions
  43     } s;
  44     const Value *Const;     // valid for constants
  45     unsigned FrameIx;       // valid for stack objects
  46   } u;
  47   MDNode *mdPtr;
  48   uint64_t Offset;
  49   DebugLoc DL;
  50   unsigned Order;
  51   bool Invalid;
  52 public:
  53   // Constructor for non-constants.
  54   SDDbgValue(MDNode *mdP, SDNode *N, unsigned R, uint64_t off, DebugLoc dl,
  55              unsigned O) : mdPtr(mdP), Offset(off), DL(dl), Order(O),
  56                            Invalid(false) {
  57     kind = SDNODE;
  58     u.s.Node = N;
  59     u.s.ResNo = R;
  60   }
  61
  62   // Constructor for constants.
  63   SDDbgValue(MDNode *mdP, const Value *C, uint64_t off, DebugLoc dl,
  64              unsigned O) :
  65     mdPtr(mdP), Offset(off), DL(dl), Order(O), Invalid(false) {
  66     kind = CONST;
  67     u.Const = C;
  68   }
  69
  70   // Constructor for frame indices.
  71   SDDbgValue(MDNode *mdP, unsigned FI, uint64_t off, DebugLoc dl, unsigned O) :
  72     mdPtr(mdP), Offset(off), DL(dl), Order(O), Invalid(false) {
  73     kind = FRAMEIX;
  74     u.FrameIx = FI;
  75   }
  76
  77   // Returns the kind.
  78   DbgValueKind getKind() { return kind; }
  79
  80   // Returns the MDNode pointer.
  81   MDNode *getMDPtr() { return mdPtr; }
  82
  83   // Returns the SDNode* for a register ref
  84   SDNode *getSDNode() { assert (kind==SDNODE); return u.s.Node; }
  85
  86   // Returns the ResNo for a register ref
  87   unsigned getResNo() { assert (kind==SDNODE); return u.s.ResNo; }
  88
  89   // Returns the Value* for a constant
  90   const Value *getConst() { assert (kind==CONST); return u.Const; }
  91
  92   // Returns the FrameIx for a stack object
  93   unsigned getFrameIx() { assert (kind==FRAMEIX); return u.FrameIx; }
  94
  95   // Returns the offset.
  96   uint64_t getOffset() { return Offset; }
  97
  98   // Returns the DebugLoc.
  99   DebugLoc getDebugLoc() { return DL; }
 100
 101   // Returns the SDNodeOrder.  This is the order of the preceding node in the
 102   // input.
 103   unsigned getOrder() { return Order; }
 104
 105   // setIsInvalidated / isInvalidated - Setter / getter of the "Invalidated"
 106   // property. A SDDbgValue is invalid if the SDNode that produces the value is
 107   // deleted.
 108   void setIsInvalidated() { Invalid = true; }
 109   bool isInvalidated() { return Invalid; }
 110 };
 111
 112 } // end llvm namespace
 113
 114 #endif