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 
20 namespace llvm {
21 
22 /// Represents a location in source code.
23 class SMLoc {
24   const char *Ptr;
25 public:
SMLoc()26   SMLoc() : Ptr(nullptr) {}
27 
isValid()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 
getPointer()33   const char *getPointer() const { return Ptr; }
34 
getFromPointer(const char * Ptr)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".
47 class SMRange {
48 public:
49   SMLoc Start, End;
50 
SMRange()51   SMRange() {}
SMRange(SMLoc St,SMLoc En)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 
isValid()57   bool isValid() const { return Start.isValid(); }
58 };
59 
60 } // end namespace llvm
61 
62 #endif
63 
64