1//===- SMLoc.h - Source location for use with diagnostics -------*- 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 SMLoc class.  This class encapsulates a location in
11// source code for use in diagnostics.
12//
13//===----------------------------------------------------------------------===//
14
15#ifndef LLVM_SUPPORT_SMLOC_H
16#define LLVM_SUPPORT_SMLOC_H
17
18#include <cassert>
19
20namespace llvm {
21
22/// Represents a location in source code.
23class SMLoc {
24  const char *Ptr;
25
26public:
27  SMLoc() : Ptr(nullptr) {}
28
29  bool isValid() const { return Ptr != nullptr; }
30
31  bool operator==(const SMLoc &RHS) const { return RHS.Ptr == Ptr; }
32  bool operator!=(const SMLoc &RHS) const { return RHS.Ptr != Ptr; }
33
34  const char *getPointer() const { return Ptr; }
35
36  static SMLoc getFromPointer(const char *Ptr) {
37    SMLoc L;
38    L.Ptr = Ptr;
39    return L;
40  }
41};
42
43/// Represents a range in source code.
44///
45/// SMRange is implemented using a half-open range, as is the convention in C++.
46/// In the string "abc", the range (1,3] represents the substring "bc", and the
47/// range (2,2] represents an empty range between the characters "b" and "c".
48class SMRange {
49public:
50  SMLoc Start, End;
51
52  SMRange() {}
53  SMRange(SMLoc St, SMLoc En) : Start(St), End(En) {
54    assert(Start.isValid() == End.isValid() &&
55           "Start and end should either both be valid or both be invalid!");
56  }
57
58  bool isValid() const { return Start.isValid(); }
59};
60
61} // end namespace llvm
62
63#endif
64