LLVM  9.0.0svn
UnicodeCharRanges.h
Go to the documentation of this file.
1 //===--- UnicodeCharRanges.h - Types and functions for character ranges ---===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 #ifndef LLVM_SUPPORT_UNICODECHARRANGES_H
9 #define LLVM_SUPPORT_UNICODECHARRANGES_H
10 
11 #include "llvm/ADT/ArrayRef.h"
12 #include "llvm/ADT/SmallPtrSet.h"
13 #include "llvm/Support/Compiler.h"
14 #include "llvm/Support/Debug.h"
15 #include "llvm/Support/Mutex.h"
18 #include <algorithm>
19 
20 #define DEBUG_TYPE "unicode"
21 
22 namespace llvm {
23 namespace sys {
24 
25 /// Represents a closed range of Unicode code points [Lower, Upper].
29 };
30 
32  return Value < Range.Lower;
33 }
35  return Range.Upper < Value;
36 }
37 
38 /// Holds a reference to an ordered array of UnicodeCharRange and allows
39 /// to quickly check if a code point is contained in the set represented by this
40 /// array.
42 public:
44 
45  /// Constructs a UnicodeCharSet instance from an array of
46  /// UnicodeCharRanges.
47  ///
48  /// Array pointed by \p Ranges should have the lifetime at least as long as
49  /// the UnicodeCharSet instance, and should not change. Array is validated by
50  /// the constructor, so it makes sense to create as few UnicodeCharSet
51  /// instances per each array of ranges, as possible.
52 #ifdef NDEBUG
53 
54  // FIXME: This could use constexpr + static_assert. This way we
55  // may get rid of NDEBUG in this header. Unfortunately there are some
56  // problems to get this working with MSVC 2013. Change this when
57  // the support for MSVC 2013 is dropped.
58  constexpr UnicodeCharSet(CharRanges Ranges) : Ranges(Ranges) {}
59 #else
60  UnicodeCharSet(CharRanges Ranges) : Ranges(Ranges) {
61  assert(rangesAreValid());
62  }
63 #endif
64 
65  /// Returns true if the character set contains the Unicode code point
66  /// \p C.
67  bool contains(uint32_t C) const {
68  return std::binary_search(Ranges.begin(), Ranges.end(), C);
69  }
70 
71 private:
72  /// Returns true if each of the ranges is a proper closed range
73  /// [min, max], and if the ranges themselves are ordered and non-overlapping.
74  bool rangesAreValid() const {
75  uint32_t Prev = 0;
76  for (CharRanges::const_iterator I = Ranges.begin(), E = Ranges.end();
77  I != E; ++I) {
78  if (I != Ranges.begin() && Prev >= I->Lower) {
79  LLVM_DEBUG(dbgs() << "Upper bound 0x");
80  LLVM_DEBUG(dbgs().write_hex(Prev));
81  LLVM_DEBUG(dbgs() << " should be less than succeeding lower bound 0x");
82  LLVM_DEBUG(dbgs().write_hex(I->Lower) << "\n");
83  return false;
84  }
85  if (I->Upper < I->Lower) {
86  LLVM_DEBUG(dbgs() << "Upper bound 0x");
87  LLVM_DEBUG(dbgs().write_hex(I->Lower));
88  LLVM_DEBUG(dbgs() << " should not be less than lower bound 0x");
89  LLVM_DEBUG(dbgs().write_hex(I->Upper) << "\n");
90  return false;
91  }
92  Prev = I->Upper;
93  }
94 
95  return true;
96  }
97 
98  const CharRanges Ranges;
99 };
100 
101 } // namespace sys
102 } // namespace llvm
103 
104 #undef DEBUG_TYPE // "unicode"
105 
106 #endif // LLVM_SUPPORT_UNICODECHARRANGES_H
uint64_t CallInst * C
This class represents lattice values for constants.
Definition: AllocatorList.h:23
bool operator<(uint32_t Value, UnicodeCharRange Range)
bool contains(uint32_t C) const
Returns true if the character set contains the Unicode code point C.
ArrayRef - Represent a constant reference to an array (0 or more elements consecutively in memory)...
Definition: APInt.h:32
static GCRegistry::Add< CoreCLRGC > E("coreclr", "CoreCLR-compatible GC")
ArrayRef< UnicodeCharRange > CharRanges
raw_ostream & dbgs()
dbgs() - This returns a reference to a raw_ostream for debugging messages.
Definition: Debug.cpp:132
Holds a reference to an ordered array of UnicodeCharRange and allows to quickly check if a code point...
void write_hex(raw_ostream &S, uint64_t N, HexPrintStyle Style, Optional< size_t > Width=None)
#define I(x, y, z)
Definition: MD5.cpp:58
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
UnicodeCharSet(CharRanges Ranges)
Constructs a UnicodeCharSet instance from an array of UnicodeCharRanges.
Represents a closed range of Unicode code points [Lower, Upper].
LLVM Value Representation.
Definition: Value.h:72
#define LLVM_DEBUG(X)
Definition: Debug.h:122