clang  10.0.0svn
OptionalDiagnostic.h
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1 //===- OptionalDiagnostic.h - An optional diagnostic ------------*- C++ -*-===//
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 //
9 /// \file
10 /// Implements a partial diagnostic which may not be emitted.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_CLANG_AST_OPTIONALDIAGNOSTIC_H
15 #define LLVM_CLANG_AST_OPTIONALDIAGNOSTIC_H
16 
17 #include "clang/AST/APValue.h"
19 #include "llvm/ADT/APFloat.h"
20 #include "llvm/ADT/APSInt.h"
21 #include "llvm/ADT/SmallVector.h"
22 #include "llvm/ADT/StringRef.h"
23 
24 namespace clang {
25 
26 /// A partial diagnostic which we might know in advance that we are not going
27 /// to emit.
29  PartialDiagnostic *Diag;
30 
31 public:
32  explicit OptionalDiagnostic(PartialDiagnostic *Diag = nullptr) : Diag(Diag) {}
33 
34  template <typename T> OptionalDiagnostic &operator<<(const T &v) {
35  if (Diag)
36  *Diag << v;
37  return *this;
38  }
39 
41  if (Diag) {
42  SmallVector<char, 32> Buffer;
43  I.toString(Buffer);
44  *Diag << StringRef(Buffer.data(), Buffer.size());
45  }
46  return *this;
47  }
48 
49  OptionalDiagnostic &operator<<(const llvm::APFloat &F) {
50  if (Diag) {
51  // FIXME: Force the precision of the source value down so we don't
52  // print digits which are usually useless (we don't really care here if
53  // we truncate a digit by accident in edge cases). Ideally,
54  // APFloat::toString would automatically print the shortest
55  // representation which rounds to the correct value, but it's a bit
56  // tricky to implement. Could use std::to_chars.
57  unsigned precision = llvm::APFloat::semanticsPrecision(F.getSemantics());
58  precision = (precision * 59 + 195) / 196;
59  SmallVector<char, 32> Buffer;
60  F.toString(Buffer, precision);
61  *Diag << StringRef(Buffer.data(), Buffer.size());
62  }
63  return *this;
64  }
65 
67  if (Diag) {
68  SmallVector<char, 32> Buffer;
69  FX.toString(Buffer);
70  *Diag << StringRef(Buffer.data(), Buffer.size());
71  }
72  return *this;
73  }
74 };
75 
76 } // namespace clang
77 
78 #endif
OptionalDiagnostic & operator<<(const T &v)
OptionalDiagnostic & operator<<(const APFixedPoint &FX)
The APFixedPoint class works similarly to APInt/APSInt in that it is a functional replacement for a s...
Definition: FixedPoint.h:95
A partial diagnostic which we might know in advance that we are not going to emit.
do v
Definition: arm_acle.h:64
void toString(llvm::SmallVectorImpl< char > &Str) const
Definition: FixedPoint.cpp:176
llvm::APSInt APSInt
Dataflow Directional Tag Classes.
Implements a partial diagnostic that can be emitted anwyhere in a DiagnosticBuilder stream...
OptionalDiagnostic & operator<<(const llvm::APFloat &F)
OptionalDiagnostic & operator<<(const llvm::APSInt &I)
OptionalDiagnostic(PartialDiagnostic *Diag=nullptr)