Parses an APInt from the bytecode stream.
| 1294 | |
| 1295 | /// Parses an APInt from the bytecode stream. |
| 1296 | static LogicalResult parseAPInt(EncodingReader &reader, unsigned bitWidth, |
| 1297 | APInt &apIntResult) { |
| 1298 | // Small values are encoded using a single byte. |
| 1299 | if (bitWidth <= 8) { |
| 1300 | uint8_t value; |
| 1301 | if (failed(reader.readLE(value))) |
| 1302 | return reader.emitError() |
| 1303 | << "failed to read byte for APInt (<= 8 bits)."; |
| 1304 | // Validate that the value fits in the specified bit width. |
| 1305 | if (!llvm::isUIntN(bitWidth, value)) |
| 1306 | return reader.emitError() |
| 1307 | << "value " << static_cast<unsigned>(value) |
| 1308 | << " does not fit in " << bitWidth << " bits."; |
| 1309 | apIntResult = APInt(bitWidth, value); |
| 1310 | return success(); |
| 1311 | } |
| 1312 | |
| 1313 | // Large values up to 64 bits are encoded using a single varint. |
| 1314 | if (bitWidth <= 64) { |
| 1315 | uint64_t value; |
| 1316 | if (failed(reader.readSignedVarInt(value))) |
| 1317 | return reader.emitError() |
| 1318 | << "failed to read signed varint for APInt (<= 64 bits)."; |
| 1319 | // Validate that the value fits in the specified bit width. |
| 1320 | if (!llvm::isUIntN(bitWidth, value)) |
| 1321 | return reader.emitError() << "value " << value << " does not fit in " |
| 1322 | << bitWidth << " bits"; |
| 1323 | apIntResult = APInt(bitWidth, value); |
| 1324 | return success(); |
| 1325 | } |
| 1326 | |
| 1327 | // Otherwise, for really big values we encode the array of active words in |
| 1328 | // the value. |
| 1329 | uint64_t numActiveWords; |
| 1330 | if (failed(reader.readVarInt(numActiveWords))) |
| 1331 | return reader.emitError() |
| 1332 | << "failed to read numActiveWords for APInt (> 64 bits)."; |
| 1333 | // Validate that numActiveWords makes sense for the given bitWidth. |
| 1334 | uint64_t expectedMaxWords = (bitWidth + 63) / 64; |
| 1335 | if (numActiveWords > expectedMaxWords) |
| 1336 | return reader.emitError() |
| 1337 | << "numActiveWords " << numActiveWords << " exceeds maximum of " |
| 1338 | << expectedMaxWords << " for " << bitWidth << " bit"; |
| 1339 | if (numActiveWords == 0) |
| 1340 | return reader.emitError() |
| 1341 | << "numActiveWords cannot be zero for multi-word APInt"; |
| 1342 | |
| 1343 | SmallVector<uint64_t, 4> words(numActiveWords); |
| 1344 | for (uint64_t i = 0; i < numActiveWords; ++i) |
| 1345 | if (failed(reader.readSignedVarInt(words[i]))) |
| 1346 | return reader.emitError() |
| 1347 | << "failed to read word " << i << " for multi-word APInt."; |
| 1348 | apIntResult = APInt(bitWidth, words); |
| 1349 | return success(); |
| 1350 | } |
| 1351 | |
| 1352 | /// Parses a scalar attribute that was serialized directly (inline). |
| 1353 | /// Currently supports: |
nothing calls this directly
no test coverage detected