Use xxh128 instead of sha256 for file content hashing

All hash_file() calls here are cache-invalidation keys, not security
boundaries. xxh128 hashes a file in ~31 µs vs ~266 µs for sha256, which
adds up across result-cache validation, source-locator scans,
per-identifier reflection cache keys, and PHPDoc cache validation.

Existing caches invalidate once (different hash values), then rebuild.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: SanderMuller

src/Analyser/ResultCache/ResultCacheManager.php

@@ -1206,7 +1206,7 @@ private function getFileHash(string $path): string
 			return $this->fileHashes[$path];
 		}
 
-		$hash = hash_file('sha256', $path);
+		$hash = hash_file('xxh128', $path);
 		if ($hash === false) {
 			throw new CouldNotReadFileException($path);
 		}

src/Command/AnalyseApplication.php

@@ -160,7 +160,7 @@ public function analyse(
 						continue;
 					}
 
-					$newHash = hash_file('sha256', $file);
+					$newHash = hash_file('xxh128', $file);
 					if ($newHash === $hash) {
 						continue;
 					}

src/DependencyInjection/Configurator.php

@@ -106,7 +106,7 @@ public function loadContainer(): string
 			array_keys($this->dynamicParameters),
 			$this->configs,
 			PHP_VERSION_ID - PHP_RELEASE_VERSION,
-			is_file($attributesPhp) ? hash_file('sha256', $attributesPhp) : 'attributes-missing',
+			is_file($attributesPhp) ? hash_file('xxh128', $attributesPhp) : 'attributes-missing',
 			NeonAdapter::CACHE_KEY,
 			$this->getAllConfigFilesHashes(),
 			var_export(TurboExtensionEnabler::isLoaded(), true),
@@ -242,7 +242,7 @@ private function getAllConfigFilesHashes(): array
 	{
 		$hashes = [];
 		foreach ($this->allConfigFiles as $file) {
-			$hash = hash_file('sha256', $file);
+			$hash = hash_file('xxh128', $file);
 
 			if ($hash === false) {
 				throw new CouldNotReadFileException($file);

src/File/FileMonitor.php

@@ -107,7 +107,7 @@ public function getChanges(): FileMonitorResult
 
 	private function getFileHash(string $filePath): string
 	{
-		$hash = hash_file('sha256', $filePath);
+		$hash = hash_file('xxh128', $filePath);
 
 		if ($hash === false) {
 			throw new CouldNotReadFileException($filePath);

src/Reflection/BetterReflection/SourceLocator/OptimizedDirectorySourceLocator.php

@@ -51,7 +51,7 @@ public function __construct(
 	 */
 	private function getCacheKeys(string $file, Identifier $identifier): array
 	{
-		$fileHash = hash_file('sha256', $file);
+		$fileHash = hash_file('xxh128', $file);
 		if ($fileHash === false) {
 			throw new CouldNotReadFileException($file);
 		}

src/Reflection/BetterReflection/SourceLocator/OptimizedDirectorySourceLocatorFactory.php

@@ -32,7 +32,7 @@ public function createByDirectory(string $directory): OptimizedDirectorySourceLo
 		$files = $this->fileFinder->findFiles([$directory])->getFiles();
 		$fileHashes = [];
 		foreach ($files as $file) {
-			$hash = hash_file('sha256', $file);
+			$hash = hash_file('xxh128', $file);
 			if ($hash === false) {
 				continue;
 			}
@@ -105,7 +105,7 @@ public function createByFiles(array $files, string $uniqueCacheIdentifier): Opti
 	{
 		$fileHashes = [];
 		foreach ($files as $file) {
-			$hash = hash_file('sha256', $file);
+			$hash = hash_file('xxh128', $file);
 			if ($hash === false) {
 				continue;
 			}

src/Reflection/BetterReflection/SourceLocator/OptimizedSingleFileSourceLocator.php

@@ -45,7 +45,7 @@ public function __construct(
 
 	private function getVariableCacheKey(string $file): string
 	{
-		$fileHash = hash_file('sha256', $file);
+		$fileHash = hash_file('xxh128', $file);
 		if ($fileHash === false) {
 			throw new CouldNotReadFileException($file);
 		}

src/Type/FileTypeMapper.php

@@ -344,7 +344,7 @@ private function getNameScopeMap(string $fileName): array
 				[$nameScopeMap, $files] = $this->createPhpDocNodeMap($fileName, null, null, [], $fileName);
 				$filesWithHashes = [];
 				foreach ($files as $file) {
-					$newHash = hash_file('sha256', $file);
+					$newHash = hash_file('xxh128', $file);
 					$filesWithHashes[$file] = $newHash;
 				}
 				$this->cache->save($cacheKey, $variableCacheKey, [$nameScopeMap, $filesWithHashes]);
@@ -381,7 +381,7 @@ private function loadCachedPhpDocNodeMap(string $cacheKey, string $variableCache
 			[$nameScopeMap, $filesWithHashes] = $cached;
 			$useCache = true;
 			foreach ($filesWithHashes as $file => $hash) {
-				$newHash = @hash_file('sha256', $file);
+				$newHash = @hash_file('xxh128', $file);
 				if ($newHash === false) {
 					$useCache = false;
 					break;