mirror of
https://github.com/carbon-language/carbon-lang.git
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Jon Ross-Perkins
62c36eceda
This is to help identify which diagnostics we're actually using. Note that driver/testdata still has tests which don't pass this flag, and so continue to test the kind-less (default) behavior.
92 lines
3.2 KiB
C++
92 lines
3.2 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_TOOLCHAIN_DIAGNOSTICS_DIAGNOSTIC_CONSUMER_H_
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#define CARBON_TOOLCHAIN_DIAGNOSTICS_DIAGNOSTIC_CONSUMER_H_
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#include "common/ostream.h"
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#include "llvm/ADT/StringRef.h"
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#include "toolchain/diagnostics/diagnostic.h"
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namespace Carbon {
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// Receives diagnostics as they are emitted.
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class DiagnosticConsumer {
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public:
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virtual ~DiagnosticConsumer() = default;
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// Handle a diagnostic.
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//
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// This relies on moves of the Diagnostic. At present, diagnostics are
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// allocated on the stack, so their lifetime is that of HandleDiagnostic.
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// However, SortingDiagnosticConsumer needs a longer lifetime, until all
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// diagnostics have been produced. As a consequence, it needs to either copy
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// or move the Diagnostic, and right now we're moving due to the overhead of
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// notes.
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//
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// At present, there is no persistent storage of diagnostics because IDEs
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// would be fine with diagnostics being printed immediately and discarded,
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// without SortingDiagnosticConsumer. If this becomes a performance issue, we
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// may want to investigate alternative ownership models that address both IDE
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// and CLI user needs.
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virtual auto HandleDiagnostic(Diagnostic diagnostic) -> void = 0;
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// Flushes any buffered input.
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virtual auto Flush() -> void {}
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};
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// A diagnostic consumer that prints to a stream.
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class StreamDiagnosticConsumer : public DiagnosticConsumer {
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public:
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explicit StreamDiagnosticConsumer(llvm::raw_ostream& stream,
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bool include_diagnostic_kind)
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: stream_(&stream), include_diagnostic_kind_(include_diagnostic_kind) {}
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auto HandleDiagnostic(Diagnostic diagnostic) -> void override;
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auto Flush() -> void override { stream_->flush(); }
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auto set_stream(llvm::raw_ostream* stream) -> void { stream_ = stream; }
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private:
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auto Print(const DiagnosticMessage& message, llvm::StringRef prefix) -> void;
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llvm::raw_ostream* stream_;
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// Whether to include the diagnostic kind when printing.
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bool include_diagnostic_kind_;
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// Whethere we've printed a diagnostic. Used for printing separators.
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bool printed_diagnostic_ = false;
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};
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// Returns a diagnostic consumer instance that prints to stderr.
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auto ConsoleDiagnosticConsumer() -> DiagnosticConsumer&;
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// Diagnostic consumer adaptor that tracks whether any errors have been
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// produced.
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class ErrorTrackingDiagnosticConsumer : public DiagnosticConsumer {
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public:
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explicit ErrorTrackingDiagnosticConsumer(DiagnosticConsumer& next_consumer)
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: next_consumer_(&next_consumer) {}
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auto HandleDiagnostic(Diagnostic diagnostic) -> void override {
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seen_error_ |= diagnostic.level == DiagnosticLevel::Error;
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next_consumer_->HandleDiagnostic(std::move(diagnostic));
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}
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// Reset whether we've seen an error.
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auto Reset() -> void { seen_error_ = false; }
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// Returns whether we've seen an error since the last reset.
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auto seen_error() const -> bool { return seen_error_; }
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private:
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DiagnosticConsumer* next_consumer_;
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bool seen_error_ = false;
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};
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} // namespace Carbon
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#endif // CARBON_TOOLCHAIN_DIAGNOSTICS_DIAGNOSTIC_CONSUMER_H_
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