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378 lines
14 KiB
PHP
378 lines
14 KiB
PHP
<?php
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namespace Psalm\Internal\Analyzer\Statements\Block;
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use PhpParser;
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use Psalm\Internal\Analyzer\ClassLikeAnalyzer;
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use Psalm\Internal\Analyzer\ScopeAnalyzer;
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use Psalm\Internal\Analyzer\StatementsAnalyzer;
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use Psalm\CodeLocation;
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use Psalm\Context;
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use Psalm\Issue\InvalidCatch;
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use Psalm\IssueBuffer;
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use Psalm\Internal\Scope\LoopScope;
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use Psalm\Type;
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use Psalm\Type\Atomic\TNamedObject;
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use Psalm\Type\Union;
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/**
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* @internal
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*/
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class TryAnalyzer
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{
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/**
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* @param StatementsAnalyzer $statements_analyzer
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* @param PhpParser\Node\Stmt\TryCatch $stmt
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* @param Context $context
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*
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* @return false|null
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*/
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public static function analyze(
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StatementsAnalyzer $statements_analyzer,
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PhpParser\Node\Stmt\TryCatch $stmt,
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Context $context
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) {
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$catch_actions = [];
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$all_catches_leave = true;
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$codebase = $statements_analyzer->getCodebase();
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/** @var int $i */
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foreach ($stmt->catches as $i => $catch) {
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$catch_actions[$i] = ScopeAnalyzer::getFinalControlActions(
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$catch->stmts,
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$codebase->config->exit_functions
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);
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$all_catches_leave = $all_catches_leave && !in_array(ScopeAnalyzer::ACTION_NONE, $catch_actions[$i], true);
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}
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$existing_thrown_exceptions = $context->possibly_thrown_exceptions;
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/**
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* @var array<string, bool>
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*/
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$context->possibly_thrown_exceptions = [];
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if ($all_catches_leave) {
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$try_context = $context;
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} else {
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$try_context = clone $context;
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if ($codebase->alter_code) {
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$try_context->branch_point = $try_context->branch_point ?: (int) $stmt->getAttribute('startFilePos');
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}
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}
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$assigned_var_ids = $try_context->assigned_var_ids;
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$context->assigned_var_ids = [];
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$old_unreferenced_vars = $try_context->unreferenced_vars;
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$newly_unreferenced_vars = [];
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$reassigned_vars = [];
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if ($statements_analyzer->analyze($stmt->stmts, $context) === false) {
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return false;
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}
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/** @var array<string, bool> */
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$newly_assigned_var_ids = $context->assigned_var_ids;
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$context->assigned_var_ids = array_merge(
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$assigned_var_ids,
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$newly_assigned_var_ids
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);
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if ($try_context !== $context) {
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foreach ($context->vars_in_scope as $var_id => $type) {
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if (!isset($try_context->vars_in_scope[$var_id])) {
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$try_context->vars_in_scope[$var_id] = clone $type;
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$try_context->vars_in_scope[$var_id]->from_docblock = true;
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$type->possibly_undefined_from_try = true;
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} else {
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$try_context->vars_in_scope[$var_id] = Type::combineUnionTypes(
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$try_context->vars_in_scope[$var_id],
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$type
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);
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}
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}
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$try_context->vars_possibly_in_scope = $context->vars_possibly_in_scope;
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$context->referenced_var_ids = array_merge(
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$try_context->referenced_var_ids,
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$context->referenced_var_ids
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);
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if ($context->collect_references) {
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$newly_unreferenced_vars = array_merge(
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$newly_unreferenced_vars,
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array_diff_key(
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$context->unreferenced_vars,
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$old_unreferenced_vars
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)
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);
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foreach ($context->unreferenced_vars as $var_id => $locations) {
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if (isset($old_unreferenced_vars[$var_id])
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&& $old_unreferenced_vars[$var_id] !== $locations
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) {
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$reassigned_vars[$var_id] = $locations;
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}
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}
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}
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}
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$try_leaves_loop = $context->loop_scope
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&& $context->loop_scope->final_actions
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&& !in_array(ScopeAnalyzer::ACTION_NONE, $context->loop_scope->final_actions, true);
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if (!$all_catches_leave) {
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foreach ($newly_assigned_var_ids as $assigned_var_id => $_) {
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$context->removeVarFromConflictingClauses($assigned_var_id);
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}
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} else {
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foreach ($newly_assigned_var_ids as $assigned_var_id => $_) {
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$try_context->removeVarFromConflictingClauses($assigned_var_id);
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}
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}
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// at this point we have two contexts – $context, in which it is assumed that everything was fine,
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// and $try_context - which allows all variables to have the union of the values before and after
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// the try was applied
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$original_context = clone $try_context;
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/** @var int $i */
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foreach ($stmt->catches as $i => $catch) {
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$catch_context = clone $original_context;
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$fq_catch_classes = [];
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$catch_var_name = $catch->var->name;
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if (!is_string($catch_var_name)) {
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throw new \UnexpectedValueException('Catch var name must be a string');
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}
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foreach ($catch->types as $catch_type) {
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$fq_catch_class = ClassLikeAnalyzer::getFQCLNFromNameObject(
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$catch_type,
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$statements_analyzer->getAliases()
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);
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if ($original_context->check_classes) {
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if (ClassLikeAnalyzer::checkFullyQualifiedClassLikeName(
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$statements_analyzer,
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$fq_catch_class,
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new CodeLocation($statements_analyzer->getSource(), $catch_type, $context->include_location),
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$statements_analyzer->getSuppressedIssues(),
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false
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) === false) {
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return false;
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}
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}
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if (($codebase->classExists($fq_catch_class)
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&& strtolower($fq_catch_class) !== 'exception'
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&& !($codebase->classExtends($fq_catch_class, 'Exception')
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|| $codebase->classImplements($fq_catch_class, 'Throwable')))
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|| ($codebase->interfaceExists($fq_catch_class)
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&& strtolower($fq_catch_class) !== 'throwable'
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&& !$codebase->interfaceExtends($fq_catch_class, 'Throwable'))
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) {
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if (IssueBuffer::accepts(
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new InvalidCatch(
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'Class/interface ' . $fq_catch_class . ' cannot be caught',
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new CodeLocation($statements_analyzer->getSource(), $stmt),
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$fq_catch_class
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),
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$statements_analyzer->getSuppressedIssues()
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)) {
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return false;
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}
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}
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$fq_catch_classes[] = $fq_catch_class;
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}
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$potentially_caught_classes = array_flip($fq_catch_classes);
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if ($catch_context->collect_exceptions) {
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foreach ($fq_catch_classes as $fq_catch_class) {
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$fq_catch_class_lower = strtolower($fq_catch_class);
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foreach ($context->possibly_thrown_exceptions as $exception_fqcln => $_) {
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$exception_fqcln_lower = strtolower($exception_fqcln);
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if ($exception_fqcln_lower === $fq_catch_class_lower) {
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unset($context->possibly_thrown_exceptions[$exception_fqcln]);
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continue;
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}
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if ($codebase->classExists($exception_fqcln)
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&& $codebase->classExtendsOrImplements(
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$exception_fqcln,
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$fq_catch_class
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)
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) {
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unset($context->possibly_thrown_exceptions[$exception_fqcln]);
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continue;
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}
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if ($codebase->interfaceExists($exception_fqcln)
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&& $codebase->interfaceExtends(
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$exception_fqcln,
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$fq_catch_class
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)
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) {
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unset($context->possibly_thrown_exceptions[$exception_fqcln]);
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continue;
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}
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}
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}
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}
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$catch_var_id = '$' . $catch_var_name;
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$catch_context->vars_in_scope[$catch_var_id] = new Union(
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array_map(
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/**
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* @param string $fq_catch_class
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*
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* @return Type\Atomic
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*/
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function ($fq_catch_class) use ($codebase) {
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$catch_class_type = new TNamedObject($fq_catch_class);
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if (version_compare(PHP_VERSION, '7.0.0dev', '>=')
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&& $codebase->interfaceExists($fq_catch_class)
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&& !$codebase->interfaceExtends($fq_catch_class, 'Throwable')
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) {
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$catch_class_type->addIntersectionType(new TNamedObject('Throwable'));
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}
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return $catch_class_type;
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},
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$fq_catch_classes
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)
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);
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// discard all clauses because crazy stuff may have happened in try block
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$catch_context->clauses = [];
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$catch_context->vars_possibly_in_scope[$catch_var_id] = true;
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if (!$statements_analyzer->hasVariable($catch_var_id)) {
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$location = new CodeLocation(
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$statements_analyzer,
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$catch->var,
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$context->include_location
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);
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$statements_analyzer->registerVariable(
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$catch_var_id,
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$location,
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$try_context->branch_point
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);
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$catch_context->unreferenced_vars[$catch_var_id] = [$location->getHash() => $location];
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}
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// this registers the variable to avoid unfair deadcode issues
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$catch_context->hasVariable($catch_var_id, $statements_analyzer);
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$suppressed_issues = $statements_analyzer->getSuppressedIssues();
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if (!in_array('RedundantCondition', $suppressed_issues, true)) {
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$statements_analyzer->addSuppressedIssues(['RedundantCondition']);
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}
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$statements_analyzer->analyze($catch->stmts, $catch_context);
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if (!in_array('RedundantCondition', $suppressed_issues, true)) {
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$statements_analyzer->removeSuppressedIssues(['RedundantCondition']);
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}
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$context->referenced_var_ids = array_merge(
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$catch_context->referenced_var_ids,
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$context->referenced_var_ids
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);
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if ($context->collect_references && $catch_actions[$i] !== [ScopeAnalyzer::ACTION_END]) {
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foreach ($context->unreferenced_vars as $var_id => $_) {
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if (!isset($catch_context->unreferenced_vars[$var_id])) {
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unset($context->unreferenced_vars[$var_id]);
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}
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}
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$newly_unreferenced_vars = array_merge(
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$newly_unreferenced_vars,
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array_diff_key(
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$catch_context->unreferenced_vars,
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$old_unreferenced_vars
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)
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);
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foreach ($catch_context->unreferenced_vars as $var_id => $locations) {
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if (!isset($old_unreferenced_vars[$var_id])
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&& (isset($context->unreferenced_vars[$var_id])
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|| isset($newly_assigned_var_ids[$var_id]))
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) {
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$statements_analyzer->registerVariableUses($locations);
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} elseif (isset($old_unreferenced_vars[$var_id])
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&& $old_unreferenced_vars[$var_id] !== $locations
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) {
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$statements_analyzer->registerVariableUses($locations);
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}
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}
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}
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if ($context->collect_exceptions) {
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$potentially_caught_classes = array_diff_key(
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$potentially_caught_classes,
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$context->possibly_thrown_exceptions
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);
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}
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if ($catch_actions[$i] !== [ScopeAnalyzer::ACTION_END]) {
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foreach ($catch_context->vars_in_scope as $var_id => $type) {
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if ($context->hasVariable($var_id)
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&& $context->vars_in_scope[$var_id]->getId() !== $type->getId()
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) {
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$context->vars_in_scope[$var_id] = Type::combineUnionTypes(
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$context->vars_in_scope[$var_id],
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$type
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);
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}
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}
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$context->vars_possibly_in_scope = array_merge(
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$catch_context->vars_possibly_in_scope,
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$context->vars_possibly_in_scope
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);
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}
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}
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if ($context->loop_scope
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&& !$try_leaves_loop
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&& !in_array(ScopeAnalyzer::ACTION_NONE, $context->loop_scope->final_actions, true)
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) {
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$context->loop_scope->final_actions[] = ScopeAnalyzer::ACTION_NONE;
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}
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if ($stmt->finally) {
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$statements_analyzer->analyze($stmt->finally->stmts, $context);
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}
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if ($context->collect_references) {
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foreach ($old_unreferenced_vars as $var_id => $locations) {
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if (isset($context->unreferenced_vars[$var_id])
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&& $context->unreferenced_vars[$var_id] !== $locations
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) {
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$statements_analyzer->registerVariableUses($locations);
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}
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}
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}
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$context->possibly_thrown_exceptions += $existing_thrown_exceptions;
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return null;
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}
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}
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