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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\Process; |
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use FFI\CData; |
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use PhpProfiler\Lib\Elf\SymbolResolver\Elf64SymbolResolver; |
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use PhpProfiler\Lib\Process\MemoryMap\ProcessMemoryArea; |
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use PhpProfiler\Lib\Process\MemoryReader\MemoryReaderInterface; |
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use PhpProfiler\Lib\Process\MemoryReader\MemoryReaderException; |
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/** |
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* Class ProcessModuleSymbolReader |
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* @package PhpProfiler\ProcessReader |
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*/ |
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final class ProcessModuleSymbolReader implements ProcessSymbolReaderInterface |
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{ |
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private Elf64SymbolResolver $symbol_resolver; |
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/** @var ProcessMemoryArea[] */ |
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private array $memory_areas; |
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private int $base_address; |
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private MemoryReaderInterface $memory_reader; |
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private ?int $tls_block_address; |
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private int $pid; |
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/** |
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* ProcessModuleSymbolResolver constructor. |
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* @param int $pid |
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* @param Elf64SymbolResolver $symbol_resolver |
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* @param ProcessMemoryArea[] $memory_areas |
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* @param MemoryReaderInterface $memory_reader |
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* @param int|null $tls_block_address |
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*/ |
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public function __construct( |
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int $pid, |
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Elf64SymbolResolver $symbol_resolver, |
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array $memory_areas, |
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MemoryReaderInterface $memory_reader, |
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?int $tls_block_address |
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) { |
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$this->pid = $pid; |
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$this->symbol_resolver = $symbol_resolver; |
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$this->memory_areas = $memory_areas; |
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$this->base_address = hexdec(current($memory_areas)->begin); |
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$this->memory_reader = $memory_reader; |
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$this->tls_block_address = $tls_block_address; |
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} |
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/** |
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* @param string $symbol_name |
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* @return \FFI\CArray|null |
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* @throws MemoryReaderException |
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* @throws ProcessSymbolReaderException |
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*/ |
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public function read(string $symbol_name): ?CData |
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{ |
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$address_and_size = $this->resolveAddressAndSize($symbol_name); |
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if ($address_and_size === null) { |
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return null; |
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} |
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[$address, $size] = $address_and_size; |
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return $this->memory_reader->read($this->pid, $address, $size); |
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} |
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/** |
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* @param string $symbol_name |
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* @return int|null |
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* @throws ProcessSymbolReaderException |
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*/ |
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public function resolveAddress(string $symbol_name): ?int |
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{ |
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$address_and_size = $this->resolveAddressAndSize($symbol_name); |
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if ($address_and_size === null) { |
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return null; |
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} |
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[$address,] = $address_and_size; |
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return $address; |
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} |
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/** |
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* @param string $symbol_name |
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* @return int[]|null |
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* @throws ProcessSymbolReaderException |
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*/ |
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private function resolveAddressAndSize(string $symbol_name): ?array |
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{ |
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$symbol = $this->symbol_resolver->resolve($symbol_name); |
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if ($symbol->isUndefined()) { |
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return null; |
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} |
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$base_address = $this->base_address; |
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if ($symbol->isTls()) { |
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if (is_null($this->tls_block_address)) { |
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throw new ProcessSymbolReaderException( |
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'trying to resolve TLS symbol but cannot find TLS block address' |
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); |
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} |
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$base_address = $this->tls_block_address; |
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} |
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return [$base_address + $symbol->st_value->toInt(), $symbol->st_size->toInt()]; |
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} |
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} |
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sj-i /
php-profiler
