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-rw-r--r--include/clang/AST/OptionalDiagnostic.h78
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diff --git a/include/clang/AST/OptionalDiagnostic.h b/include/clang/AST/OptionalDiagnostic.h
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+//===- OptionalDiagnostic.h - An optional diagnostic ------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+/// \file
+/// Implements a partial diagnostic which may not be emitted.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_AST_OPTIONALDIAGNOSTIC_H
+#define LLVM_CLANG_AST_OPTIONALDIAGNOSTIC_H
+
+#include "clang/AST/APValue.h"
+#include "clang/Basic/PartialDiagnostic.h"
+#include "llvm/ADT/APFloat.h"
+#include "llvm/ADT/APSInt.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
+
+namespace clang {
+
+/// A partial diagnostic which we might know in advance that we are not going
+/// to emit.
+class OptionalDiagnostic {
+ PartialDiagnostic *Diag;
+
+public:
+ explicit OptionalDiagnostic(PartialDiagnostic *Diag = nullptr) : Diag(Diag) {}
+
+ template <typename T> OptionalDiagnostic &operator<<(const T &v) {
+ if (Diag)
+ *Diag << v;
+ return *this;
+ }
+
+ OptionalDiagnostic &operator<<(const llvm::APSInt &I) {
+ if (Diag) {
+ SmallVector<char, 32> Buffer;
+ I.toString(Buffer);
+ *Diag << StringRef(Buffer.data(), Buffer.size());
+ }
+ return *this;
+ }
+
+ OptionalDiagnostic &operator<<(const llvm::APFloat &F) {
+ if (Diag) {
+ // FIXME: Force the precision of the source value down so we don't
+ // print digits which are usually useless (we don't really care here if
+ // we truncate a digit by accident in edge cases). Ideally,
+ // APFloat::toString would automatically print the shortest
+ // representation which rounds to the correct value, but it's a bit
+ // tricky to implement. Could use std::to_chars.
+ unsigned precision = llvm::APFloat::semanticsPrecision(F.getSemantics());
+ precision = (precision * 59 + 195) / 196;
+ SmallVector<char, 32> Buffer;
+ F.toString(Buffer, precision);
+ *Diag << StringRef(Buffer.data(), Buffer.size());
+ }
+ return *this;
+ }
+
+ OptionalDiagnostic &operator<<(const APFixedPoint &FX) {
+ if (Diag) {
+ SmallVector<char, 32> Buffer;
+ FX.toString(Buffer);
+ *Diag << StringRef(Buffer.data(), Buffer.size());
+ }
+ return *this;
+ }
+};
+
+} // namespace clang
+
+#endif