1//===- llvm/Remarks/RemarkStreamer.h ----------------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file declares the main interface for streaming remarks.
10//
11// This is used to stream any llvm::remarks::Remark to an open file taking
12// advantage of all the serialization capabilities developed for remarks (e.g.
13// metadata in a section, bitstream format, etc.).
14//
15// Typically, a specialized remark emitter should hold a reference to the main
16// remark streamer set up in the LLVMContext, and should convert specialized
17// diagnostics to llvm::remarks::Remark objects as they get emitted.
18//
19// Specialized remark emitters can be components like:
20// * Remarks from LLVM (M)IR passes
21// * Remarks from the frontend
22// * Remarks from an intermediate IR
23//
24// This allows for composition between specialized remark emitters throughout
25// the compilation pipeline, that end up in the same file, using the same format
26// and serialization techniques.
27//
28//===----------------------------------------------------------------------===//
29
30#ifndef LLVM_REMARKS_REMARKSTREAMER_H
31#define LLVM_REMARKS_REMARKSTREAMER_H
32
33#include "llvm/Remarks/RemarkSerializer.h"
34#include "llvm/Support/Error.h"
35#include "llvm/Support/Regex.h"
36#include <memory>
37#include <optional>
38
39namespace llvm {
40
41class raw_ostream;
42
43namespace remarks {
44class RemarkStreamer final {
45 /// The regex used to filter remarks based on the passes that emit them.
46 std::optional<Regex> PassFilter;
47 /// The object used to serialize the remarks to a specific format.
48 std::unique_ptr<remarks::RemarkSerializer> RemarkSerializer;
49 /// The filename that the remark diagnostics are emitted to.
50 const std::optional<std::string> Filename;
51
52public:
53 RemarkStreamer(std::unique_ptr<remarks::RemarkSerializer> RemarkSerializer,
54 std::optional<StringRef> Filename = std::nullopt);
55
56 /// Return the filename that the remark diagnostics are emitted to.
57 std::optional<StringRef> getFilename() const {
58 return Filename ? std::optional<StringRef>(*Filename) : std::nullopt;
59 }
60 /// Return stream that the remark diagnostics are emitted to.
61 raw_ostream &getStream() { return RemarkSerializer->OS; }
62 /// Return the serializer used for this stream.
63 remarks::RemarkSerializer &getSerializer() { return *RemarkSerializer; }
64 /// Set a pass filter based on a regex \p Filter.
65 /// Returns an error if the regex is invalid.
66 Error setFilter(StringRef Filter);
67 /// Check wether the string matches the filter.
68 bool matchesFilter(StringRef Str);
69 /// Check if the remarks also need to have associated metadata in a section.
70 bool needsSection() const;
71};
72} // end namespace remarks
73} // end namespace llvm
74
75#endif // LLVM_REMARKS_REMARKSTREAMER_H
76

source code of llvm/include/llvm/Remarks/RemarkStreamer.h