SDNodeDbgValue.h revision 1899ca3358e0f0477781472c3b0f4868b9d6e42b 
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
20namespace llvm {
21
22class MDNode;
23class SDNode;
24class Value;
25
26/// SDDbgValue - Holds the information from a dbg_value node through SDISel.
27/// We do not use SDValue here to avoid including its header.
28
29class SDDbgValue {
30public:
31  enum DbgValueKind {
32    SDNODE = 0,             // value is the result of an expression
33    CONST = 1,              // value is a constant
34    FRAMEIX = 2             // value is contents of a stack location
35  };
36private:
37  enum DbgValueKind kind;
38  union {
39    struct {
40      SDNode *Node;         // valid for expressions
41      unsigned ResNo;       // valid for expressions
42    } s;
43    Value *Const;           // valid for constants
44    unsigned FrameIx;       // valid for stack objects
45  } u;
46  MDNode *mdPtr;
47  uint64_t Offset;
48  DebugLoc DL;
49  unsigned Order;
50public:
51  // Constructor for non-constants.
52  SDDbgValue(MDNode *mdP, SDNode *N, unsigned R, uint64_t off, DebugLoc dl,
53             unsigned O) : mdPtr(mdP), Offset(off), DL(dl), Order(O) {
54    kind = SDNODE;
55    u.s.Node = N;
56    u.s.ResNo = R;
57  }
58
59  // Constructor for constants.
60  SDDbgValue(MDNode *mdP, Value *C, uint64_t off, DebugLoc dl, unsigned O) :
61    mdPtr(mdP), Offset(off), DL(dl), Order(O) {
62    kind = CONST;
63    u.Const = C;
64  }
65
66  // Constructor for frame indices.
67  SDDbgValue(MDNode *mdP, unsigned FI, uint64_t off, DebugLoc dl, unsigned O) :
68    mdPtr(mdP), Offset(off), DL(dl), Order(O) {
69    kind = FRAMEIX;
70    u.FrameIx = FI;
71  }
72
73  // Returns the kind.
74  DbgValueKind getKind() { return kind; }
75
76  // Returns the MDNode pointer.
77  MDNode *getMDPtr() { return mdPtr; }
78
79  // Returns the SDNode* for a register ref
80  SDNode *getSDNode() { assert (kind==SDNODE); return u.s.Node; }
81
82  // Returns the ResNo for a register ref
83  unsigned getResNo() { assert (kind==SDNODE); return u.s.ResNo; }
84
85  // Returns the Value* for a constant
86  Value *getConst() { assert (kind==CONST); return u.Const; }
87
88  // Returns the FrameIx for a stack object
89  unsigned getFrameIx() { assert (kind==FRAMEIX); return u.FrameIx; }
90
91  // Returns the offset.
92  uint64_t getOffset() { return Offset; }
93
94  // Returns the DebugLoc.
95  DebugLoc getDebugLoc() { return DL; }
96
97  // Returns the SDNodeOrder.  This is the order of the preceding node in the
98  // input.
99  unsigned getOrder() { return Order; }
100};
101
102} // end llvm namespace
103
104#endif
105