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psalm/src/Psalm/Codebase/Scanner.php

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<?php
namespace Psalm\Codebase;
use Psalm\Codebase;
use Psalm\Config;
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use Psalm\Provider\FileProvider;
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use Psalm\Provider\FileReferenceProvider;
use Psalm\Provider\FileStorageProvider;
use Psalm\Scanner\FileScanner;
/**
* @psalm-type IssueData = array{
* severity: string,
* line_from: int,
* line_to: int,
* type: string,
* message: string,
* file_name: string,
* file_path: string,
* snippet: string,
* from: int,
* to: int,
* snippet_from: int,
* snippet_to: int,
* column_from: int,
* column_to: int
* }
*
* @psalm-type PoolData = array{
* classlikes_data:array{
* 0:array<string, bool>,
* 1:array<string, bool>,
* 2:array<string, bool>,
* 3:array<string, bool>,
* 4:array<string, bool>,
* 5:array<string, bool>,
* 6:array<string, bool>,
* 7:array<string, \PhpParser\Node\Stmt\Trait_>,
* 8:array<string, \Psalm\Aliases>,
* 9:array<string, int>
* },
* scanner_data:array{
* 0:array<string, string>,
* 1:array<string, string>,
* 2:array<string, string>,
* 3:array<string, bool>,
* 4:array<string, bool>,
* 5:array<string, string>,
* 6:array<string, bool>,
* 7:array<string, bool>,
* 8:array<string, bool>
* },
* issues:array<int, IssueData>,
* changed_members:array<string, array<string, bool>>,
* unchanged_signature_members:array<string, array<string, bool>>,
* diff_map:array<string, array<int, array{0:int, 1:int, 2:int, 3:int}>>,
* classlike_storage:array<string, \Psalm\Storage\ClassLikeStorage>,
* file_storage:array<string, \Psalm\Storage\FileStorage>
* }
*/
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/**
* @internal
*
* Contains methods that aid in the scanning of Psalm's codebase
*/
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class Scanner
{
/**
* @var Codebase
*/
private $codebase;
/**
* @var array<string, string>
*/
private $classlike_files = [];
/**
* @var array<string, bool>
*/
private $deep_scanned_classlike_files = [];
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/**
* @var array<string, string>
*/
private $files_to_scan = [];
/**
* @var array<string, string>
*/
private $classes_to_scan = [];
/**
* @var array<string, bool>
*/
private $classes_to_deep_scan = [];
/**
* @var array<string, string>
*/
private $files_to_deep_scan = [];
/**
* @var array<string, bool>
*/
private $scanned_files = [];
/**
* @var array<string, bool>
*/
private $store_scan_failure = [];
/**
* @var array<string, bool>
*/
private $reflected_classlikes_lc = [];
/**
* @var Reflection
*/
private $reflection;
/**
* @var Config
*/
private $config;
/**
* @var bool
*/
private $debug_output;
/**
* @var FileStorageProvider
*/
private $file_storage_provider;
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/**
* @var FileProvider
*/
private $file_provider;
/**
* @var FileReferenceProvider
*/
private $file_reference_provider;
/**
* @var bool
*/
private $is_forked = false;
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/**
* @param bool $debug_output
*/
public function __construct(
Codebase $codebase,
Config $config,
FileStorageProvider $file_storage_provider,
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FileProvider $file_provider,
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Reflection $reflection,
FileReferenceProvider $file_reference_provider,
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$debug_output
) {
$this->codebase = $codebase;
$this->reflection = $reflection;
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$this->file_provider = $file_provider;
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$this->debug_output = $debug_output;
$this->file_storage_provider = $file_storage_provider;
$this->config = $config;
$this->file_reference_provider = $file_reference_provider;
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}
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/**
* @param array<string, string> $files_to_scan
*
* @return void
*/
public function addFilesToShallowScan(array $files_to_scan)
{
$this->files_to_scan += $files_to_scan;
}
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/**
* @param array<string, string> $files_to_scan
*
* @return void
*/
public function addFilesToDeepScan(array $files_to_scan)
{
$this->files_to_scan += $files_to_scan;
$this->files_to_deep_scan += $files_to_scan;
}
/**
* @param string $file_path
*
* @return void
*/
public function addFileToShallowScan($file_path)
{
$this->files_to_scan[$file_path] = $file_path;
}
/**
* @param string $file_path
*
* @return void
*/
public function addFileToDeepScan($file_path)
{
$this->files_to_scan[$file_path] = $file_path;
$this->files_to_deep_scan[$file_path] = $file_path;
}
/**
* @param string $file_path
*
* @return void
*/
public function removeFile($file_path)
{
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unset($this->scanned_files[$file_path]);
}
/**
* @param string $fq_classlike_name_lc
* @return void
*/
public function removeClassLike($fq_classlike_name_lc)
{
unset($this->classlike_files[$fq_classlike_name_lc]);
unset($this->deep_scanned_classlike_files[$fq_classlike_name_lc]);
}
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/**
* @param string $fq_classlike_name_lc
* @param string $file_path
*
* @return void
*/
public function setClassLikeFilePath($fq_classlike_name_lc, $file_path)
{
$this->classlike_files[$fq_classlike_name_lc] = $file_path;
}
/**
* @param string $fq_classlike_name_lc
*
* @return string
*/
public function getClassLikeFilePath($fq_classlike_name_lc)
{
if (!isset($this->classlike_files[$fq_classlike_name_lc])) {
throw new \UnexpectedValueException('Could not find file for ' . $fq_classlike_name_lc);
}
return $this->classlike_files[$fq_classlike_name_lc];
}
/**
* @param string $fq_classlike_name
* @param string|null $referencing_file_path
* @param bool $analyze_too
* @param bool $store_failure
*
* @return void
*/
public function queueClassLikeForScanning(
$fq_classlike_name,
$referencing_file_path = null,
$analyze_too = false,
$store_failure = true
) {
$fq_classlike_name_lc = strtolower($fq_classlike_name);
// avoid checking classes that we know will just end in failure
if ($fq_classlike_name_lc === 'null' || substr($fq_classlike_name_lc, -5) === '\null') {
return;
}
if (!isset($this->classlike_files[$fq_classlike_name_lc])
|| ($analyze_too && !isset($this->deep_scanned_classlike_files[$fq_classlike_name_lc]))
) {
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if (!isset($this->classes_to_scan[$fq_classlike_name_lc]) || $store_failure) {
$this->classes_to_scan[$fq_classlike_name_lc] = $fq_classlike_name;
}
if ($analyze_too) {
$this->classes_to_deep_scan[$fq_classlike_name_lc] = true;
}
$this->store_scan_failure[$fq_classlike_name] = $store_failure;
if (PropertyMap::inPropertyMap($fq_classlike_name_lc)) {
$public_mapped_properties = PropertyMap::getPropertyMap()[$fq_classlike_name_lc];
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foreach ($public_mapped_properties as $public_mapped_property) {
if (strtolower($public_mapped_property) !== $fq_classlike_name_lc) {
$property_type = \Psalm\Type::parseString($public_mapped_property);
$property_type->queueClassLikesForScanning($this->codebase);
}
}
}
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}
if ($referencing_file_path) {
$this->file_reference_provider->addFileReferenceToClass($referencing_file_path, $fq_classlike_name_lc);
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}
}
/**
* @return bool
*/
public function scanFiles(ClassLikes $classlikes, int $pool_size = 1)
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{
$has_changes = false;
while ($this->files_to_scan || $this->classes_to_scan) {
if ($this->files_to_scan) {
if ($this->scanFilePaths($pool_size)) {
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$has_changes = true;
}
} else {
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$this->convertClassesToFilePaths($classlikes);
}
}
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return $has_changes;
}
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private function scanFilePaths(int $pool_size) : bool
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{
$filetype_scanners = $this->config->getFiletypeScanners();
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$files_to_scan = array_filter(
$this->files_to_scan,
function (string $file_path) : bool {
return !isset($this->scanned_files[$file_path])
|| (isset($this->files_to_deep_scan[$file_path]) && !$this->scanned_files[$file_path]);
}
);
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$this->files_to_scan = [];
if (!$files_to_scan) {
return false;
}
$files_to_deep_scan = $this->files_to_deep_scan;
$scanner_worker =
/**
* @param int $_
* @param string $file_path
*
* @return void
*/
function ($_, $file_path) use ($filetype_scanners, $files_to_deep_scan) {
$this->scanFile(
$file_path,
$filetype_scanners,
isset($files_to_deep_scan[$file_path])
);
};
if (!$this->is_forked && $pool_size > 1 && count($files_to_scan) > 512) {
$pool_size = ceil(min($pool_size, count($files_to_scan) / 256));
} else {
$pool_size = 1;
}
if ($pool_size > 1) {
$process_file_paths = [];
$i = 0;
foreach ($files_to_scan as $file_path) {
$process_file_paths[$i % $pool_size][] = $file_path;
++$i;
}
// Run scanning one file at a time, splitting the set of
// files up among a given number of child processes.
$pool = new \Psalm\Fork\Pool(
$process_file_paths,
/** @return void */
function () {
$project_checker = \Psalm\Checker\ProjectChecker::getInstance();
$statements_provider = $project_checker->codebase->statements_provider;
$project_checker->codebase->scanner->isForked();
$project_checker->codebase->file_storage_provider->deleteAll();
$project_checker->codebase->classlike_storage_provider->deleteAll();
$statements_provider->resetDiffs();
},
$scanner_worker,
/**
* @return PoolData
*/
function () {
$project_checker = \Psalm\Checker\ProjectChecker::getInstance();
$statements_provider = $project_checker->codebase->statements_provider;
return [
'classlikes_data' => $project_checker->codebase->classlikes->getThreadData(),
'scanner_data' => $project_checker->codebase->scanner->getThreadData(),
'issues' => \Psalm\IssueBuffer::getIssuesData(),
'changed_members' => $statements_provider->getChangedMembers(),
'unchanged_signature_members' => $statements_provider->getUnchangedSignatureMembers(),
'diff_map' => $statements_provider->getDiffMap(),
'classlike_storage' => $project_checker->classlike_storage_provider->getAll(),
'file_storage' => $project_checker->file_storage_provider->getAll(),
];
}
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);
// Wait for all tasks to complete and collect the results.
/**
* @var array<int, PoolData>
*/
$forked_pool_data = $pool->wait();
foreach ($forked_pool_data as $pool_data) {
\Psalm\IssueBuffer::addIssues($pool_data['issues']);
$this->codebase->statements_provider->addChangedMembers(
$pool_data['changed_members']
);
$this->codebase->statements_provider->addUnchangedSignatureMembers(
$pool_data['unchanged_signature_members']
);
$this->codebase->statements_provider->addDiffMap(
$pool_data['diff_map']
);
$this->codebase->file_storage_provider->addMore($pool_data['file_storage']);
$this->codebase->classlike_storage_provider->addMore($pool_data['classlike_storage']);
$this->codebase->classlikes->addThreadData($pool_data['classlikes_data']);
$this->addThreadData($pool_data['scanner_data']);
}
} else {
$i = 0;
foreach ($files_to_scan as $file_path => $_) {
$scanner_worker($i, $file_path);
++$i;
}
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}
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return true;
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}
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/**
* @return void
*/
private function convertClassesToFilePaths(ClassLikes $classlikes)
{
$classes_to_scan = $this->classes_to_scan;
$this->classes_to_scan = [];
foreach ($classes_to_scan as $fq_classlike_name) {
$fq_classlike_name_lc = strtolower($fq_classlike_name);
if (isset($this->reflected_classlikes_lc[$fq_classlike_name_lc])) {
continue;
}
if ($classlikes->isMissingClassLike($fq_classlike_name_lc)) {
continue;
}
if (!isset($this->classlike_files[$fq_classlike_name_lc])) {
if ($classlikes->doesClassLikeExist($fq_classlike_name_lc)) {
if ($this->debug_output) {
echo 'Using reflection to get metadata for ' . $fq_classlike_name . "\n";
}
$reflected_class = new \ReflectionClass($fq_classlike_name);
$this->reflection->registerClass($reflected_class);
$this->reflected_classlikes_lc[$fq_classlike_name_lc] = true;
} elseif ($this->fileExistsForClassLike($classlikes, $fq_classlike_name)) {
// even though we've checked this above, calling the method invalidates it
if (isset($this->classlike_files[$fq_classlike_name_lc])) {
/** @var string */
$file_path = $this->classlike_files[$fq_classlike_name_lc];
$this->files_to_scan[$file_path] = $file_path;
if (isset($this->classes_to_deep_scan[$fq_classlike_name_lc])) {
unset($this->classes_to_deep_scan[$fq_classlike_name_lc]);
$this->files_to_deep_scan[$file_path] = $file_path;
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}
}
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} elseif ($this->store_scan_failure[$fq_classlike_name]) {
$classlikes->registerMissingClassLike($fq_classlike_name_lc);
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}
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} elseif (isset($this->classes_to_deep_scan[$fq_classlike_name_lc])
&& !isset($this->deep_scanned_classlike_files[$fq_classlike_name_lc])
) {
$file_path = $this->classlike_files[$fq_classlike_name_lc];
$this->files_to_scan[$file_path] = $file_path;
unset($this->classes_to_deep_scan[$fq_classlike_name_lc]);
$this->files_to_deep_scan[$file_path] = $file_path;
$this->deep_scanned_classlike_files[$fq_classlike_name_lc] = true;
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}
}
}
/**
* @param string $file_path
* @param array<string, string> $filetype_scanners
* @param bool $will_analyze
*
* @return FileScanner
*
* @psalm-suppress MixedOffset
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*/
private function scanFile(
$file_path,
array $filetype_scanners,
$will_analyze = false
) {
$file_scanner = $this->getScannerForPath($file_path, $filetype_scanners, $will_analyze);
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if (isset($this->scanned_files[$file_path])
&& (!$will_analyze || $this->scanned_files[$file_path])
) {
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throw new \UnexpectedValueException('Should not be rescanning ' . $file_path);
}
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$file_contents = $this->file_provider->getContents($file_path);
$from_cache = $this->file_storage_provider->has($file_path, $file_contents);
if (!$from_cache) {
$this->file_storage_provider->create($file_path);
}
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$this->scanned_files[$file_path] = $will_analyze;
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$file_storage = $this->file_storage_provider->get($file_path);
$file_scanner->scan(
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$this->codebase,
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$file_storage,
$from_cache,
$this->debug_output
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);
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if (!$from_cache) {
if (!$file_storage->has_visitor_issues && $this->file_storage_provider->cache) {
$this->file_storage_provider->cache->writeToCache($file_storage, $file_contents);
}
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} else {
$this->codebase->statements_provider->setUnchangedFile($file_path);
foreach ($file_storage->required_file_paths as $required_file_path) {
if ($will_analyze) {
$this->addFileToDeepScan($required_file_path);
} else {
$this->addFileToShallowScan($required_file_path);
}
}
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foreach ($file_storage->classlikes_in_file as $fq_classlike_name) {
$this->codebase->exhumeClassLikeStorage($fq_classlike_name, $file_path);
}
foreach ($file_storage->required_classes as $fq_classlike_name) {
$this->queueClassLikeForScanning($fq_classlike_name, $file_path, $will_analyze, false);
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}
foreach ($file_storage->required_interfaces as $fq_classlike_name) {
$this->queueClassLikeForScanning($fq_classlike_name, $file_path, false, false);
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}
foreach ($file_storage->referenced_classlikes as $fq_classlike_name) {
$this->queueClassLikeForScanning($fq_classlike_name, $file_path, false, false);
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}
if ($this->codebase->register_autoload_files) {
foreach ($file_storage->functions as $function_storage) {
$this->codebase->functions->addGlobalFunction($function_storage->cased_name, $function_storage);
}
foreach ($file_storage->constants as $name => $type) {
$this->codebase->addGlobalConstantType($name, $type);
}
}
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}
return $file_scanner;
}
/**
* @param string $file_path
* @param array<string, string> $filetype_scanners
* @param bool $will_analyze
*
* @return FileScanner
*/
private function getScannerForPath(
$file_path,
array $filetype_scanners,
$will_analyze = false
) {
$path_parts = explode(DIRECTORY_SEPARATOR, $file_path);
$file_name_parts = explode('.', array_pop($path_parts));
$extension = count($file_name_parts) > 1 ? array_pop($file_name_parts) : null;
$file_name = $this->config->shortenFileName($file_path);
if (isset($filetype_scanners[$extension])) {
/** @var FileScanner */
return new $filetype_scanners[$extension]($file_path, $file_name, $will_analyze);
}
return new FileScanner($file_path, $file_name, $will_analyze);
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}
/**
* @return array<string, bool>
*/
public function getScannedFiles()
{
return $this->scanned_files;
}
/**
* Checks whether a class exists, and if it does then records what file it's in
* for later checking
*
* @param string $fq_class_name
*
* @return bool
*/
private function fileExistsForClassLike(ClassLikes $classlikes, $fq_class_name)
{
$fq_class_name_lc = strtolower($fq_class_name);
if (isset($this->classlike_files[$fq_class_name_lc])) {
return true;
}
if (isset($this->existing_classlikes_lc[$fq_class_name_lc])) {
throw new \InvalidArgumentException('Why are you asking about a builtin class?');
}
$composer_file_path = $this->config->getComposerFilePathForClassLike($fq_class_name);
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if ($composer_file_path && file_exists($composer_file_path)) {
if ($this->debug_output) {
echo 'Using composer to locate file for ' . $fq_class_name . "\n";
}
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$classlikes->addFullyQualifiedClassLikeName(
$fq_class_name_lc,
realpath($composer_file_path)
);
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return true;
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}
$old_level = error_reporting();
if (!$this->debug_output) {
error_reporting(E_ERROR);
}
try {
if ($this->debug_output) {
echo 'Using reflection to locate file for ' . $fq_class_name . "\n";
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}
$reflected_class = new \ReflectionClass($fq_class_name);
} catch (\ReflectionException $e) {
error_reporting($old_level);
// do not cache any results here (as case-sensitive filenames can screw things up)
return false;
}
error_reporting($old_level);
/** @psalm-suppress MixedMethodCall due to Reflection class weirdness */
$file_path = (string)$reflected_class->getFileName();
// if the file was autoloaded but exists in evaled code only, return false
if (!file_exists($file_path)) {
return false;
}
$fq_class_name = $reflected_class->getName();
$classlikes->addFullyQualifiedClassLikeName($fq_class_name_lc);
if ($reflected_class->isInterface()) {
$classlikes->addFullyQualifiedInterfaceName($fq_class_name, $file_path);
} elseif ($reflected_class->isTrait()) {
$classlikes->addFullyQualifiedTraitName($fq_class_name, $file_path);
} else {
$classlikes->addFullyQualifiedClassName($fq_class_name, $file_path);
}
return true;
}
/**
* @return array{
* 0: array<string, string>,
* 1: array<string, string>,
* 2: array<string, string>,
* 3: array<string, bool>,
* 4: array<string, bool>,
* 5: array<string, string>,
* 6: array<string, bool>,
* 7: array<string, bool>,
* 8: array<string, bool>
* }
*/
public function getThreadData()
{
return [
$this->files_to_scan,
$this->files_to_deep_scan,
$this->classes_to_scan,
$this->classes_to_deep_scan,
$this->store_scan_failure,
$this->classlike_files,
$this->deep_scanned_classlike_files,
$this->scanned_files,
$this->reflected_classlikes_lc
];
}
/**
* @param array{
* 0: array<string, string>,
* 1: array<string, string>,
* 2: array<string, string>,
* 3: array<string, bool>,
* 4: array<string, bool>,
* 5: array<string, string>,
* 6: array<string, bool>,
* 7: array<string, bool>,
* 8: array<string, bool>
* } $thread_data
*
* @return void
*/
public function addThreadData(array $thread_data)
{
list(
$files_to_scan,
$files_to_deep_scan,
$classes_to_scan,
$classes_to_deep_scan,
$store_scan_failure,
$classlike_files,
$deep_scanned_classlike_files,
$scanned_files,
$reflected_classlikes_lc
) = $thread_data;
$this->files_to_scan = array_merge($files_to_scan, $this->files_to_scan);
$this->files_to_deep_scan = array_merge($files_to_deep_scan, $this->files_to_deep_scan);
$this->classes_to_scan = array_merge($classes_to_scan, $this->classes_to_scan);
$this->classes_to_deep_scan = array_merge($classes_to_deep_scan, $this->classes_to_deep_scan);
$this->store_scan_failure = array_merge($store_scan_failure, $this->store_scan_failure);
$this->classlike_files = array_merge($classlike_files, $this->classlike_files);
$this->deep_scanned_classlike_files = array_merge(
$deep_scanned_classlike_files,
$this->deep_scanned_classlike_files
);
$this->scanned_files = array_merge($scanned_files, $this->scanned_files);
$this->reflected_classlikes_lc = array_merge($reflected_classlikes_lc, $this->reflected_classlikes_lc);
}
/**
* @return void
*/
public function isForked()
{
$this->is_forked = true;
}
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}