1 //===--- SerializedDiagnosticReader.cpp - Reads diagnostics ---------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "clang/Frontend/SerializedDiagnosticReader.h"
11 #include "clang/Basic/FileManager.h"
12 #include "clang/Frontend/SerializedDiagnostics.h"
13 #include "llvm/Support/ManagedStatic.h"
15 using namespace clang;
16 using namespace clang::serialized_diags;
18 std::error_code SerializedDiagnosticReader::readDiagnostics(StringRef File) {
19 // Open the diagnostics file.
21 FileManager FileMgr(FO);
23 auto Buffer = FileMgr.getBufferForFile(File);
25 return SDError::CouldNotLoad;
27 llvm::BitstreamCursor Stream(**Buffer);
28 Optional<llvm::BitstreamBlockInfo> BlockInfo;
30 // Sniff for the signature.
31 if (Stream.Read(8) != 'D' ||
32 Stream.Read(8) != 'I' ||
33 Stream.Read(8) != 'A' ||
34 Stream.Read(8) != 'G')
35 return SDError::InvalidSignature;
37 // Read the top level blocks.
38 while (!Stream.AtEndOfStream()) {
39 if (Stream.ReadCode() != llvm::bitc::ENTER_SUBBLOCK)
40 return SDError::InvalidDiagnostics;
43 switch (Stream.ReadSubBlockID()) {
44 case llvm::bitc::BLOCKINFO_BLOCK_ID: {
45 BlockInfo = Stream.ReadBlockInfoBlock();
47 return SDError::MalformedBlockInfoBlock;
48 Stream.setBlockInfo(&*BlockInfo);
52 if ((EC = readMetaBlock(Stream)))
56 if ((EC = readDiagnosticBlock(Stream)))
60 if (!Stream.SkipBlock())
61 return SDError::MalformedTopLevelBlock;
65 return std::error_code();
68 enum class SerializedDiagnosticReader::Cursor {
74 llvm::ErrorOr<SerializedDiagnosticReader::Cursor>
75 SerializedDiagnosticReader::skipUntilRecordOrBlock(
76 llvm::BitstreamCursor &Stream, unsigned &BlockOrRecordID) {
79 while (!Stream.AtEndOfStream()) {
80 unsigned Code = Stream.ReadCode();
82 switch ((llvm::bitc::FixedAbbrevIDs)Code) {
83 case llvm::bitc::ENTER_SUBBLOCK:
84 BlockOrRecordID = Stream.ReadSubBlockID();
85 return Cursor::BlockBegin;
87 case llvm::bitc::END_BLOCK:
88 if (Stream.ReadBlockEnd())
89 return SDError::InvalidDiagnostics;
90 return Cursor::BlockEnd;
92 case llvm::bitc::DEFINE_ABBREV:
93 Stream.ReadAbbrevRecord();
96 case llvm::bitc::UNABBREV_RECORD:
97 return SDError::UnsupportedConstruct;
100 // We found a record.
101 BlockOrRecordID = Code;
102 return Cursor::Record;
106 return SDError::InvalidDiagnostics;
110 SerializedDiagnosticReader::readMetaBlock(llvm::BitstreamCursor &Stream) {
111 if (Stream.EnterSubBlock(clang::serialized_diags::BLOCK_META))
112 return SDError::MalformedMetadataBlock;
114 bool VersionChecked = false;
117 unsigned BlockOrCode = 0;
118 llvm::ErrorOr<Cursor> Res = skipUntilRecordOrBlock(Stream, BlockOrCode);
125 case Cursor::BlockBegin:
126 if (Stream.SkipBlock())
127 return SDError::MalformedMetadataBlock;
128 case Cursor::BlockEnd:
130 return SDError::MissingVersion;
131 return std::error_code();
134 SmallVector<uint64_t, 1> Record;
135 unsigned RecordID = Stream.readRecord(BlockOrCode, Record);
137 if (RecordID == RECORD_VERSION) {
138 if (Record.size() < 1)
139 return SDError::MissingVersion;
140 if (Record[0] > VersionNumber)
141 return SDError::VersionMismatch;
142 VersionChecked = true;
148 SerializedDiagnosticReader::readDiagnosticBlock(llvm::BitstreamCursor &Stream) {
149 if (Stream.EnterSubBlock(clang::serialized_diags::BLOCK_DIAG))
150 return SDError::MalformedDiagnosticBlock;
153 if ((EC = visitStartOfDiagnostic()))
156 SmallVector<uint64_t, 16> Record;
158 unsigned BlockOrCode = 0;
159 llvm::ErrorOr<Cursor> Res = skipUntilRecordOrBlock(Stream, BlockOrCode);
164 case Cursor::BlockBegin:
165 // The only blocks we care about are subdiagnostics.
166 if (BlockOrCode == serialized_diags::BLOCK_DIAG) {
167 if ((EC = readDiagnosticBlock(Stream)))
169 } else if (!Stream.SkipBlock())
170 return SDError::MalformedSubBlock;
172 case Cursor::BlockEnd:
173 if ((EC = visitEndOfDiagnostic()))
175 return std::error_code();
183 unsigned RecID = Stream.readRecord(BlockOrCode, Record, &Blob);
185 if (RecID < serialized_diags::RECORD_FIRST ||
186 RecID > serialized_diags::RECORD_LAST)
189 switch ((RecordIDs)RecID) {
190 case RECORD_CATEGORY:
191 // A category has ID and name size.
192 if (Record.size() != 2)
193 return SDError::MalformedDiagnosticRecord;
194 if ((EC = visitCategoryRecord(Record[0], Blob)))
198 // A diagnostic has severity, location (4), category, flag, and message
200 if (Record.size() != 8)
201 return SDError::MalformedDiagnosticRecord;
202 if ((EC = visitDiagnosticRecord(
203 Record[0], Location(Record[1], Record[2], Record[3], Record[4]),
204 Record[5], Record[6], Blob)))
207 case RECORD_DIAG_FLAG:
208 // A diagnostic flag has ID and name size.
209 if (Record.size() != 2)
210 return SDError::MalformedDiagnosticRecord;
211 if ((EC = visitDiagFlagRecord(Record[0], Blob)))
214 case RECORD_FILENAME:
215 // A filename has ID, size, timestamp, and name size. The size and
216 // timestamp are legacy fields that are always zero these days.
217 if (Record.size() != 4)
218 return SDError::MalformedDiagnosticRecord;
219 if ((EC = visitFilenameRecord(Record[0], Record[1], Record[2], Blob)))
223 // A fixit has two locations (4 each) and message size.
224 if (Record.size() != 9)
225 return SDError::MalformedDiagnosticRecord;
226 if ((EC = visitFixitRecord(
227 Location(Record[0], Record[1], Record[2], Record[3]),
228 Location(Record[4], Record[5], Record[6], Record[7]), Blob)))
231 case RECORD_SOURCE_RANGE:
232 // A source range is two locations (4 each).
233 if (Record.size() != 8)
234 return SDError::MalformedDiagnosticRecord;
235 if ((EC = visitSourceRangeRecord(
236 Location(Record[0], Record[1], Record[2], Record[3]),
237 Location(Record[4], Record[5], Record[6], Record[7]))))
241 // A version is just a number.
242 if (Record.size() != 1)
243 return SDError::MalformedDiagnosticRecord;
244 if ((EC = visitVersionRecord(Record[0])))
252 class SDErrorCategoryType final : public std::error_category {
253 const char *name() const noexcept override {
254 return "clang.serialized_diags";
256 std::string message(int IE) const override {
257 SDError E = static_cast<SDError>(IE);
259 case SDError::CouldNotLoad:
260 return "Failed to open diagnostics file";
261 case SDError::InvalidSignature:
262 return "Invalid diagnostics signature";
263 case SDError::InvalidDiagnostics:
264 return "Parse error reading diagnostics";
265 case SDError::MalformedTopLevelBlock:
266 return "Malformed block at top-level of diagnostics";
267 case SDError::MalformedSubBlock:
268 return "Malformed sub-block in a diagnostic";
269 case SDError::MalformedBlockInfoBlock:
270 return "Malformed BlockInfo block";
271 case SDError::MalformedMetadataBlock:
272 return "Malformed Metadata block";
273 case SDError::MalformedDiagnosticBlock:
274 return "Malformed Diagnostic block";
275 case SDError::MalformedDiagnosticRecord:
276 return "Malformed Diagnostic record";
277 case SDError::MissingVersion:
278 return "No version provided in diagnostics";
279 case SDError::VersionMismatch:
280 return "Unsupported diagnostics version";
281 case SDError::UnsupportedConstruct:
282 return "Bitcode constructs that are not supported in diagnostics appear";
283 case SDError::HandlerFailed:
284 return "Generic error occurred while handling a record";
286 llvm_unreachable("Unknown error type!");
291 static llvm::ManagedStatic<SDErrorCategoryType> ErrorCategory;
292 const std::error_category &clang::serialized_diags::SDErrorCategory() {
293 return *ErrorCategory;