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