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| Rev | Author | Line No. | Line |
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| 14 | pmbaty | 1 | //===- OptionalDiagnostic.h - An optional diagnostic ------------*- C++ -*-===// |
| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | /// \file |
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| 10 | /// Implements a partial diagnostic which may not be emitted. |
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| 11 | // |
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| 12 | //===----------------------------------------------------------------------===// |
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| 13 | |||
| 14 | #ifndef LLVM_CLANG_AST_OPTIONALDIAGNOSTIC_H |
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| 15 | #define LLVM_CLANG_AST_OPTIONALDIAGNOSTIC_H |
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| 16 | |||
| 17 | #include "clang/AST/APValue.h" |
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| 18 | #include "clang/Basic/PartialDiagnostic.h" |
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| 19 | #include "llvm/ADT/APFloat.h" |
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| 20 | #include "llvm/ADT/APSInt.h" |
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| 21 | #include "llvm/ADT/SmallVector.h" |
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| 22 | #include "llvm/ADT/StringRef.h" |
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| 23 | |||
| 24 | namespace clang { |
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| 25 | |||
| 26 | /// A partial diagnostic which we might know in advance that we are not going |
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| 27 | /// to emit. |
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| 28 | class OptionalDiagnostic { |
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| 29 | PartialDiagnostic *Diag; |
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| 30 | |||
| 31 | public: |
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| 32 | explicit OptionalDiagnostic(PartialDiagnostic *Diag = nullptr) : Diag(Diag) {} |
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| 33 | |||
| 34 | template <typename T> OptionalDiagnostic &operator<<(const T &v) { |
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| 35 | if (Diag) |
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| 36 | *Diag << v; |
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| 37 | return *this; |
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| 38 | } |
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| 39 | |||
| 40 | OptionalDiagnostic &operator<<(const llvm::APSInt &I) { |
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| 41 | if (Diag) { |
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| 42 | SmallVector<char, 32> Buffer; |
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| 43 | I.toString(Buffer); |
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| 44 | *Diag << StringRef(Buffer.data(), Buffer.size()); |
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| 45 | } |
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| 46 | return *this; |
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| 47 | } |
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| 48 | |||
| 49 | OptionalDiagnostic &operator<<(const llvm::APFloat &F) { |
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| 50 | if (Diag) { |
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| 51 | // FIXME: Force the precision of the source value down so we don't |
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| 52 | // print digits which are usually useless (we don't really care here if |
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| 53 | // we truncate a digit by accident in edge cases). Ideally, |
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| 54 | // APFloat::toString would automatically print the shortest |
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| 55 | // representation which rounds to the correct value, but it's a bit |
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| 56 | // tricky to implement. Could use std::to_chars. |
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| 57 | unsigned precision = llvm::APFloat::semanticsPrecision(F.getSemantics()); |
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| 58 | precision = (precision * 59 + 195) / 196; |
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| 59 | SmallVector<char, 32> Buffer; |
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| 60 | F.toString(Buffer, precision); |
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| 61 | *Diag << StringRef(Buffer.data(), Buffer.size()); |
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| 62 | } |
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| 63 | return *this; |
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| 64 | } |
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| 65 | |||
| 66 | OptionalDiagnostic &operator<<(const llvm::APFixedPoint &FX) { |
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| 67 | if (Diag) { |
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| 68 | SmallVector<char, 32> Buffer; |
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| 69 | FX.toString(Buffer); |
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| 70 | *Diag << StringRef(Buffer.data(), Buffer.size()); |
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| 71 | } |
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| 72 | return *this; |
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| 73 | } |
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| 74 | }; |
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| 75 | |||
| 76 | } // namespace clang |
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| 77 | |||
| 78 | #endif |