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57 lines
1.6 KiB
C++
57 lines
1.6 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#ifndef CARBON_COMMON_VLOG_INTERNAL_H_
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#define CARBON_COMMON_VLOG_INTERNAL_H_
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#include <cstdlib>
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#include "llvm/Support/raw_ostream.h"
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namespace Carbon::Internal {
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// Wraps a stream and exiting for fatal errors. Should only be used by check.h
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// macros.
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class VLoggingStream {
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public:
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// Internal type used in macros to dispatch to the `operator|` overload.
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struct Helper {};
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explicit VLoggingStream(llvm::raw_ostream* stream)
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// Prefix the buffer with the current bug report message.
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: stream_(stream) {}
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~VLoggingStream() = default;
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// If the bool cast occurs, it's because the condition is false. This supports
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// && short-circuiting the creation of ExitingStream.
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explicit operator bool() const { return true; }
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// Forward output to llvm::errs.
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template <typename T>
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auto operator<<(const T& message) -> VLoggingStream& {
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*stream_ << message;
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return *this;
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}
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// Low-precedence binary operator overload used in vlog.h macros.
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friend auto operator|(Helper /*helper*/, VLoggingStream& /*stream*/) -> void {
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}
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private:
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[[noreturn]] auto Done() -> void;
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llvm::raw_ostream* stream_;
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};
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} // namespace Carbon::Internal
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// Raw logging stream. This should be used when building forms of vlog
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// macros.
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#define CARBON_VLOG_INTERNAL_STREAM(stream) \
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Carbon::Internal::VLoggingStream::Helper() | \
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Carbon::Internal::VLoggingStream(stream)
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#endif // CARBON_COMMON_VLOG_INTERNAL_H_
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