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<?php |
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/** |
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* This file is part of the sj-i/php-profiler package. |
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* |
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* (c) sji <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace PhpProfiler\Lib\Elf\Tls; |
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use PhpProfiler\Lib\ByteStream\CDataByteReader; |
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use PhpProfiler\Lib\ByteStream\IntegerByteSequence\IntegerByteSequenceReader; |
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use PhpProfiler\Lib\Elf\Process\ProcessSymbolReaderInterface; |
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use PhpProfiler\Lib\Elf\Process\ProcessSymbolReaderException; |
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use PhpProfiler\Lib\Process\MemoryReader\MemoryReaderException; |
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use PhpProfiler\Lib\Process\MemoryReader\MemoryReaderInterface; |
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/** |
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* This class uses some debugging symbols from libpthread.so, |
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* so if the target process doesn't load libpthread, it won't work. |
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*/ |
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final class LibThreadDbTlsFinder implements TlsFinderInterface |
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{ |
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public function __construct( |
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private ProcessSymbolReaderInterface $symbol_reader, |
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private ThreadPointerRetrieverInterface $thread_pointer_retriever, |
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private MemoryReaderInterface $memory_reader, |
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private IntegerByteSequenceReader $integer_reader, |
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) { |
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} |
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/** |
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* @throws MemoryReaderException |
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* @throws ProcessSymbolReaderException |
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* @throws TlsFinderException |
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*/ |
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public function findTlsBlock(int $pid, int $module_index): int |
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{ |
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$thread_pointer = $this->thread_pointer_retriever->getThreadPointer($pid); |
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[,,$thread_db_pthread_dtvp_offset] = $this->getLibThreadDbDescriptor('_thread_db_pthread_dtvp'); |
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[$thread_db_dtv_dtv_size,,] = $this->getLibThreadDbDescriptor('_thread_db_dtv_dtv'); |
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[,,$thread_db_dtv_t_pointer_val_offset] = $this->getLibThreadDbDescriptor('_thread_db_dtv_t_pointer_val'); |
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// [,,] = $this->getLibThreadDbDescriptor($pid, '_thread_db_link_map_l_tls_modid'); |
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$dtv_pointer_address = $thread_pointer + $thread_db_pthread_dtvp_offset; |
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$dtv_pointer_cdata = $this->memory_reader->read($pid, $dtv_pointer_address, 8); |
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$dtv_pointer = $this->integer_reader->read64(new CDataByteReader($dtv_pointer_cdata), 0)->toInt(); |
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$dtv_slot = $thread_db_dtv_dtv_size * $module_index; |
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$tls_address_pointer = $dtv_pointer + $dtv_slot + $thread_db_dtv_t_pointer_val_offset; |
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$tls_address_cdata = $this->memory_reader->read($pid, $tls_address_pointer, 8); |
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return $this->integer_reader->read64(new CDataByteReader($tls_address_cdata), 0)->toInt(); |
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} |
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/** |
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* @return int[] |
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* @throws MemoryReaderException |
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* @throws ProcessSymbolReaderException |
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* @throws TlsFinderException |
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*/ |
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private function getLibThreadDbDescriptor(string $symbol_name): array |
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{ |
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$buffer = $this->symbol_reader->read($symbol_name); |
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if (is_null($buffer)) { |
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throw new TlsFinderException('cannot find ' . $symbol_name); |
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} |
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$desc = new CDataByteReader($buffer); |
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$desc_size = $this->integer_reader->read32($desc, 0) >> 3; |
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$desc_num = $this->integer_reader->read32($desc, 4); |
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$desc_offset = $this->integer_reader->read32($desc, 8); |
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return [$desc_size, $desc_num, $desc_offset]; |
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} |
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} |
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sj-i /
php-profiler
