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Chandler Carruth
bf02d1f4b0
This required adding a few headers that were found transitively before, but not too many. This is sadly a fairly manual process of opening every file in my IDE, but I think I got everything in `//common` and `//toolchain`. There are a few cases where technically we don't need `foo.h` to be included into `foo.cpp`, but I've forced those to stay with a pragma. I've tried to catch the places where we can cut deps in Bazel as well, but not sure I got all of those. I had been noticing these in other PRs and it seemed better to isolate the change.
78 lines
2.4 KiB
C++
78 lines
2.4 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_CHECK_INTERNAL_H_
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#define CARBON_COMMON_CHECK_INTERNAL_H_
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#include "common/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 ExitingStream {
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public:
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// A tag type that renders as ": " in an ExitingStream, but only if it is
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// followed by additional output. Otherwise, it renders as "". Primarily used
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// when building macros around these streams.
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struct AddSeparator {};
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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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ExitingStream()
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// Prefix the buffer with the current bug report message.
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: buffer_(buffer_str_) {}
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// Never called.
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[[noreturn]] ~ExitingStream();
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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) -> ExitingStream& {
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if (separator_) {
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buffer_ << ": ";
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separator_ = false;
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}
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buffer_ << message;
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return *this;
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}
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auto operator<<(AddSeparator /*add_separator*/) -> ExitingStream& {
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separator_ = true;
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return *this;
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}
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// Low-precedence binary operator overload used in check.h macros to flush the
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// output and exit the program. We do this in a binary operator rather than
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// the destructor to ensure good debug info and backtraces for errors.
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[[noreturn]] friend auto operator|(Helper /*helper*/, ExitingStream& stream)
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-> void {
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stream.Done();
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}
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private:
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[[noreturn]] auto Done() -> void;
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// Whether a separator should be printed if << is used again.
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bool separator_ = false;
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std::string buffer_str_;
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llvm::raw_string_ostream buffer_;
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};
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} // namespace Carbon::Internal
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// Raw exiting stream. This should be used when building forms of exiting
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// macros. It evaluates to a temporary `ExitingStream` object that can be
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// manipulated, streamed into, and then will exit the program.
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#define CARBON_CHECK_INTERNAL_STREAM() \
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Carbon::Internal::ExitingStream::Helper() | Carbon::Internal::ExitingStream()
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#endif // CARBON_COMMON_CHECK_INTERNAL_H_
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