mirror of
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603 lines
24 KiB
PHP
603 lines
24 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\ScopeAnalyzer;
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use Psalm\Internal\Analyzer\Statements\ExpressionAnalyzer;
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use Psalm\Internal\Analyzer\StatementsAnalyzer;
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use Psalm\Internal\Clause;
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use Psalm\CodeLocation;
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use Psalm\Config;
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use Psalm\Context;
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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\Algebra;
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use Psalm\Type\Reconciler;
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/**
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* @internal
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*/
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class LoopAnalyzer
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{
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/**
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* Checks an array of statements in a loop
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*
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* @param array<PhpParser\Node\Stmt> $stmts
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* @param PhpParser\Node\Expr[] $pre_conditions
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* @param PhpParser\Node\Expr[] $post_expressions
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* @param Context loop_scope->loop_context
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* @param Context $loop_scope->loop_parent_context
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* @param bool $is_do
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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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array $stmts,
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array $pre_conditions,
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array $post_expressions,
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LoopScope $loop_scope,
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Context &$inner_context = null,
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$is_do = false
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) {
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$traverser = new PhpParser\NodeTraverser;
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$assignment_mapper = new \Psalm\Internal\Visitor\AssignmentMapVisitor($loop_scope->loop_context->self);
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$traverser->addVisitor($assignment_mapper);
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$traverser->traverse(array_merge($stmts, $post_expressions));
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$assignment_map = $assignment_mapper->getAssignmentMap();
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$assignment_depth = 0;
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$asserted_var_ids = [];
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$pre_condition_clauses = [];
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$original_protected_var_ids = $loop_scope->loop_parent_context->protected_var_ids;
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$codebase = $statements_analyzer->getCodebase();
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if ($pre_conditions) {
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foreach ($pre_conditions as $pre_condition) {
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$pre_condition_clauses = array_merge(
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$pre_condition_clauses,
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Algebra::getFormula(
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$pre_condition,
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$loop_scope->loop_context->self,
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$statements_analyzer,
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$codebase
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)
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);
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}
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} else {
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$asserted_var_ids = Context::getNewOrUpdatedVarIds(
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$loop_scope->loop_parent_context,
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$loop_scope->loop_context
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);
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}
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$final_actions = ScopeAnalyzer::getFinalControlActions($stmts, Config::getInstance()->exit_functions);
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$has_break_statement = $final_actions === [ScopeAnalyzer::ACTION_BREAK];
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if ($assignment_map) {
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$first_var_id = array_keys($assignment_map)[0];
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$assignment_depth = self::getAssignmentMapDepth($first_var_id, $assignment_map);
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}
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$loop_scope->loop_context->parent_context = $loop_scope->loop_parent_context;
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if ($assignment_depth === 0 || $has_break_statement) {
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$inner_context = clone $loop_scope->loop_context;
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$inner_context->loop_scope = $loop_scope;
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$inner_context->parent_context = $loop_scope->loop_context;
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$old_referenced_var_ids = $inner_context->referenced_var_ids;
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$inner_context->referenced_var_ids = [];
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if (!$is_do) {
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foreach ($pre_conditions as $pre_condition) {
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self::applyPreConditionToLoopContext(
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$statements_analyzer,
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$pre_condition,
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$pre_condition_clauses,
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$inner_context,
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$loop_scope->loop_parent_context
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);
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}
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}
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$inner_context->protected_var_ids = $loop_scope->protected_var_ids;
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$statements_analyzer->analyze($stmts, $inner_context);
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self::updateLoopScopeContexts($loop_scope, $loop_scope->loop_parent_context);
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foreach ($post_expressions as $post_expression) {
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if (ExpressionAnalyzer::analyze(
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$statements_analyzer,
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$post_expression,
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$loop_scope->loop_context
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) === false
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) {
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return false;
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}
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}
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$new_referenced_var_ids = $inner_context->referenced_var_ids;
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$inner_context->referenced_var_ids = $old_referenced_var_ids + $inner_context->referenced_var_ids;
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$loop_scope->loop_parent_context->vars_possibly_in_scope = array_merge(
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$inner_context->vars_possibly_in_scope,
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$loop_scope->loop_parent_context->vars_possibly_in_scope
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);
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} else {
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$pre_outer_context = clone $loop_scope->loop_parent_context;
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$analyzer = $statements_analyzer->getCodebase()->analyzer;
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$original_mixed_counts = $analyzer->getMixedCountsForFile($statements_analyzer->getFilePath());
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IssueBuffer::startRecording();
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if (!$is_do) {
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foreach ($pre_conditions as $pre_condition) {
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$asserted_var_ids = array_merge(
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self::applyPreConditionToLoopContext(
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$statements_analyzer,
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$pre_condition,
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$pre_condition_clauses,
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$loop_scope->loop_context,
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$loop_scope->loop_parent_context
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),
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$asserted_var_ids
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);
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}
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}
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// record all the vars that existed before we did the first pass through the loop
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$pre_loop_context = clone $loop_scope->loop_context;
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$inner_context = clone $loop_scope->loop_context;
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$inner_context->parent_context = $loop_scope->loop_context;
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$inner_context->loop_scope = $loop_scope;
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$old_referenced_var_ids = $inner_context->referenced_var_ids;
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$inner_context->referenced_var_ids = [];
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$asserted_var_ids = array_unique($asserted_var_ids);
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$inner_context->protected_var_ids = $loop_scope->protected_var_ids;
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$statements_analyzer->analyze($stmts, $inner_context);
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self::updateLoopScopeContexts($loop_scope, $pre_outer_context);
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$inner_context->protected_var_ids = $original_protected_var_ids;
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foreach ($post_expressions as $post_expression) {
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if (ExpressionAnalyzer::analyze($statements_analyzer, $post_expression, $inner_context) === false) {
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return false;
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}
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}
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/**
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* @var array<string, bool>
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*/
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$new_referenced_var_ids = $inner_context->referenced_var_ids;
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$inner_context->referenced_var_ids = $old_referenced_var_ids + $inner_context->referenced_var_ids;
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$recorded_issues = IssueBuffer::clearRecordingLevel();
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IssueBuffer::stopRecording();
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for ($i = 0; $i < $assignment_depth; ++$i) {
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$vars_to_remove = [];
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$loop_scope->iteration_count++;
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$has_changes = false;
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// reset the $inner_context to what it was before we started the analysis,
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// but union the types with what's in the loop scope
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foreach ($inner_context->vars_in_scope as $var_id => $type) {
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if (in_array($var_id, $asserted_var_ids, true)) {
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// set the vars to whatever the while/foreach loop expects them to be
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if (!isset($pre_loop_context->vars_in_scope[$var_id])
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|| !$type->equals($pre_loop_context->vars_in_scope[$var_id])
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) {
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$has_changes = true;
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}
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} elseif (isset($pre_outer_context->vars_in_scope[$var_id])) {
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if (!$type->equals($pre_outer_context->vars_in_scope[$var_id])) {
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$has_changes = true;
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// widen the foreach context type with the initial context type
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$inner_context->vars_in_scope[$var_id] = Type::combineUnionTypes(
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$inner_context->vars_in_scope[$var_id],
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$pre_outer_context->vars_in_scope[$var_id]
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);
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// if there's a change, invalidate related clauses
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$pre_loop_context->removeVarFromConflictingClauses($var_id);
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}
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if (isset($loop_scope->loop_context->vars_in_scope[$var_id])
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&& !$type->equals($loop_scope->loop_context->vars_in_scope[$var_id])
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) {
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$has_changes = true;
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// widen the foreach context type with the initial context type
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$inner_context->vars_in_scope[$var_id] = Type::combineUnionTypes(
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$inner_context->vars_in_scope[$var_id],
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$loop_scope->loop_context->vars_in_scope[$var_id]
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);
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// if there's a change, invalidate related clauses
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$pre_loop_context->removeVarFromConflictingClauses($var_id);
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}
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} else {
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// give an opportunity to redeemed UndefinedVariable issues
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if ($recorded_issues) {
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$has_changes = true;
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}
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// if we're in a do block we don't want to remove vars before evaluating
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// the where conditional
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if (!$is_do) {
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$vars_to_remove[] = $var_id;
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}
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}
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}
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$loop_scope->loop_parent_context->vars_possibly_in_scope = array_merge(
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$inner_context->vars_possibly_in_scope,
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$loop_scope->loop_parent_context->vars_possibly_in_scope
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);
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// if there are no changes to the types, no need to re-examine
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if (!$has_changes) {
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break;
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}
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if ($inner_context->collect_references) {
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foreach ($loop_scope->possibly_unreferenced_vars as $var_id => $locations) {
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if (isset($inner_context->unreferenced_vars[$var_id])) {
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$inner_context->unreferenced_vars[$var_id] += $locations;
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} else {
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$inner_context->unreferenced_vars[$var_id] = $locations;
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}
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}
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}
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// remove vars that were defined in the foreach
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foreach ($vars_to_remove as $var_id) {
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unset($inner_context->vars_in_scope[$var_id]);
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}
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$analyzer->setMixedCountsForFile($statements_analyzer->getFilePath(), $original_mixed_counts);
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IssueBuffer::startRecording();
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foreach ($pre_conditions as $pre_condition) {
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self::applyPreConditionToLoopContext(
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$statements_analyzer,
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$pre_condition,
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$pre_condition_clauses,
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$inner_context,
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$loop_scope->loop_parent_context
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);
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}
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foreach ($asserted_var_ids as $var_id) {
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if (!isset($inner_context->vars_in_scope[$var_id])
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|| $inner_context->vars_in_scope[$var_id]->getId()
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!== $pre_loop_context->vars_in_scope[$var_id]->getId()
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|| $inner_context->vars_in_scope[$var_id]->from_docblock
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!== $pre_loop_context->vars_in_scope[$var_id]->from_docblock
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) {
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$inner_context->vars_in_scope[$var_id] = clone $pre_loop_context->vars_in_scope[$var_id];
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}
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}
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$inner_context->clauses = $pre_loop_context->clauses;
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$inner_context->protected_var_ids = $loop_scope->protected_var_ids;
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$traverser = new PhpParser\NodeTraverser;
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$traverser->addVisitor(new \Psalm\Internal\Visitor\NodeCleanerVisitor());
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$traverser->traverse($stmts);
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$statements_analyzer->analyze($stmts, $inner_context);
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self::updateLoopScopeContexts($loop_scope, $pre_outer_context);
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$inner_context->protected_var_ids = $original_protected_var_ids;
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foreach ($post_expressions as $post_expression) {
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if (ExpressionAnalyzer::analyze($statements_analyzer, $post_expression, $inner_context) === false) {
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return false;
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}
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}
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$recorded_issues = IssueBuffer::clearRecordingLevel();
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IssueBuffer::stopRecording();
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}
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if ($recorded_issues) {
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foreach ($recorded_issues as $recorded_issue) {
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// if we're not in any loops then this will just result in the issue being emitted
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IssueBuffer::bubbleUp($recorded_issue);
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}
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}
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}
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$does_sometimes_break = in_array(ScopeAnalyzer::ACTION_BREAK, $loop_scope->final_actions, true);
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$does_always_break = $loop_scope->final_actions === [ScopeAnalyzer::ACTION_BREAK];
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if ($does_sometimes_break) {
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if ($loop_scope->possibly_redefined_loop_parent_vars !== null) {
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foreach ($loop_scope->possibly_redefined_loop_parent_vars as $var => $type) {
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$loop_scope->loop_parent_context->vars_in_scope[$var] = Type::combineUnionTypes(
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$type,
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$loop_scope->loop_parent_context->vars_in_scope[$var]
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);
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}
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}
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}
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foreach ($loop_scope->loop_parent_context->vars_in_scope as $var_id => $type) {
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if ($type->hasMixed() || !isset($loop_scope->loop_context->vars_in_scope[$var_id])) {
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continue;
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}
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if ($loop_scope->loop_context->vars_in_scope[$var_id]->getId() !== $type->getId()) {
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$loop_scope->loop_parent_context->vars_in_scope[$var_id] = Type::combineUnionTypes(
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$loop_scope->loop_parent_context->vars_in_scope[$var_id],
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$loop_scope->loop_context->vars_in_scope[$var_id]
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);
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$loop_scope->loop_parent_context->removeVarFromConflictingClauses($var_id);
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}
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}
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if (!$does_always_break) {
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foreach ($loop_scope->loop_parent_context->vars_in_scope as $var_id => $type) {
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if ($type->hasMixed()) {
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continue;
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}
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if (!isset($inner_context->vars_in_scope[$var_id])) {
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unset($loop_scope->loop_parent_context->vars_in_scope[$var_id]);
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continue;
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}
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if ($inner_context->vars_in_scope[$var_id]->hasMixed()) {
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$loop_scope->loop_parent_context->vars_in_scope[$var_id] =
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$inner_context->vars_in_scope[$var_id];
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$loop_scope->loop_parent_context->removeVarFromConflictingClauses($var_id);
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continue;
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}
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if ($inner_context->vars_in_scope[$var_id]->getId() !== $type->getId()) {
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$loop_scope->loop_parent_context->vars_in_scope[$var_id] = Type::combineUnionTypes(
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$loop_scope->loop_parent_context->vars_in_scope[$var_id],
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$inner_context->vars_in_scope[$var_id]
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);
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$loop_scope->loop_parent_context->removeVarFromConflictingClauses($var_id);
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}
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}
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}
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if ($pre_conditions && $pre_condition_clauses && !ScopeAnalyzer::doesEverBreak($stmts)) {
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// if the loop contains an assertion and there are no break statements, we can negate that assertion
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// and apply it to the current context
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$negated_pre_condition_types = Algebra::getTruthsFromFormula(
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Algebra::negateFormula($pre_condition_clauses)
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);
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if ($negated_pre_condition_types) {
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$changed_var_ids = [];
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$vars_in_scope_reconciled = Reconciler::reconcileKeyedTypes(
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$negated_pre_condition_types,
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$inner_context->vars_in_scope,
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$changed_var_ids,
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[],
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$statements_analyzer,
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true,
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new CodeLocation($statements_analyzer->getSource(), $pre_conditions[0])
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);
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foreach ($changed_var_ids as $var_id) {
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if (isset($vars_in_scope_reconciled[$var_id])
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&& isset($loop_scope->loop_parent_context->vars_in_scope[$var_id])
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) {
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$loop_scope->loop_parent_context->vars_in_scope[$var_id] = $vars_in_scope_reconciled[$var_id];
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}
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$loop_scope->loop_parent_context->removeVarFromConflictingClauses($var_id);
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}
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}
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}
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$loop_scope->loop_context->referenced_var_ids = array_merge(
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$inner_context->referenced_var_ids,
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$loop_scope->loop_context->referenced_var_ids
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);
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if ($inner_context->collect_references) {
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foreach ($loop_scope->possibly_unreferenced_vars as $var_id => $locations) {
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if (isset($inner_context->unreferenced_vars[$var_id])) {
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$inner_context->unreferenced_vars[$var_id] += $locations;
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} else {
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$inner_context->unreferenced_vars[$var_id] = $locations;
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}
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}
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foreach ($inner_context->unreferenced_vars as $var_id => $locations) {
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if (!isset($new_referenced_var_ids[$var_id]) || $has_break_statement) {
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if (!isset($loop_scope->loop_context->unreferenced_vars[$var_id])) {
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$loop_scope->loop_context->unreferenced_vars[$var_id] = $locations;
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} else {
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$loop_scope->loop_context->unreferenced_vars[$var_id] += $locations;
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}
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} else {
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$statements_analyzer->registerVariableUses($locations);
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}
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}
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foreach ($loop_scope->unreferenced_vars as $var_id => $locations) {
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if (!isset($loop_scope->loop_context->unreferenced_vars[$var_id])) {
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$loop_scope->loop_context->unreferenced_vars[$var_id] = $locations;
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} else {
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$loop_scope->loop_context->unreferenced_vars[$var_id] += $locations;
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}
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}
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}
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}
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/**
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* @param LoopScope $loop_scope
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* @param Context $pre_outer_context
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*
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* @return void
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*/
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private static function updateLoopScopeContexts(
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LoopScope $loop_scope,
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Context $pre_outer_context
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) {
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$updated_loop_vars = [];
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if (!in_array(ScopeAnalyzer::ACTION_CONTINUE, $loop_scope->final_actions, true)) {
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$loop_scope->loop_context->vars_in_scope = $pre_outer_context->vars_in_scope;
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} else {
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if ($loop_scope->redefined_loop_vars !== null) {
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foreach ($loop_scope->redefined_loop_vars as $var => $type) {
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$loop_scope->loop_context->vars_in_scope[$var] = $type;
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$updated_loop_vars[$var] = true;
|
|
}
|
|
}
|
|
|
|
if ($loop_scope->possibly_redefined_loop_vars) {
|
|
foreach ($loop_scope->possibly_redefined_loop_vars as $var => $type) {
|
|
if ($loop_scope->loop_context->hasVariable($var)
|
|
&& !isset($updated_loop_vars[$var])
|
|
) {
|
|
$loop_scope->loop_context->vars_in_scope[$var] = Type::combineUnionTypes(
|
|
$loop_scope->loop_context->vars_in_scope[$var],
|
|
$type
|
|
);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// merge vars possibly in scope at the end of each loop
|
|
$loop_scope->loop_context->vars_possibly_in_scope = array_merge(
|
|
$loop_scope->loop_context->vars_possibly_in_scope,
|
|
$loop_scope->vars_possibly_in_scope
|
|
);
|
|
}
|
|
|
|
/**
|
|
* @param PhpParser\Node\Expr $pre_condition
|
|
* @param array<int, Clause> $pre_condition_clauses
|
|
* @param Context $loop_context
|
|
* @param Context $outer_context
|
|
*
|
|
* @return string[]
|
|
*/
|
|
private static function applyPreConditionToLoopContext(
|
|
StatementsAnalyzer $statements_analyzer,
|
|
PhpParser\Node\Expr $pre_condition,
|
|
array $pre_condition_clauses,
|
|
Context $loop_context,
|
|
Context $outer_context
|
|
) {
|
|
$pre_referenced_var_ids = $loop_context->referenced_var_ids;
|
|
$loop_context->referenced_var_ids = [];
|
|
|
|
$loop_context->inside_conditional = true;
|
|
|
|
if (ExpressionAnalyzer::analyze($statements_analyzer, $pre_condition, $loop_context) === false) {
|
|
return [];
|
|
}
|
|
|
|
$loop_context->inside_conditional = false;
|
|
|
|
$new_referenced_var_ids = $loop_context->referenced_var_ids;
|
|
$loop_context->referenced_var_ids = array_merge($pre_referenced_var_ids, $new_referenced_var_ids);
|
|
|
|
$asserted_var_ids = Context::getNewOrUpdatedVarIds($outer_context, $loop_context);
|
|
|
|
$loop_context->clauses = Algebra::simplifyCNF(
|
|
array_merge($outer_context->clauses, $pre_condition_clauses)
|
|
);
|
|
|
|
$reconcilable_while_types = Algebra::getTruthsFromFormula(
|
|
$loop_context->clauses,
|
|
$new_referenced_var_ids
|
|
);
|
|
|
|
$changed_var_ids = [];
|
|
|
|
if ($reconcilable_while_types) {
|
|
$pre_condition_vars_in_scope_reconciled = Reconciler::reconcileKeyedTypes(
|
|
$reconcilable_while_types,
|
|
$loop_context->vars_in_scope,
|
|
$changed_var_ids,
|
|
$new_referenced_var_ids,
|
|
$statements_analyzer,
|
|
true,
|
|
new CodeLocation($statements_analyzer->getSource(), $pre_condition)
|
|
);
|
|
|
|
$loop_context->vars_in_scope = $pre_condition_vars_in_scope_reconciled;
|
|
}
|
|
|
|
foreach ($asserted_var_ids as $var_id) {
|
|
$loop_context->clauses = Context::filterClauses(
|
|
$var_id,
|
|
$loop_context->clauses,
|
|
null,
|
|
$statements_analyzer
|
|
);
|
|
}
|
|
|
|
return $asserted_var_ids;
|
|
}
|
|
|
|
/**
|
|
* @param string $first_var_id
|
|
* @param array<string, array<string, bool>> $assignment_map
|
|
*
|
|
* @return int
|
|
*/
|
|
private static function getAssignmentMapDepth($first_var_id, array $assignment_map)
|
|
{
|
|
$max_depth = 0;
|
|
|
|
$assignment_var_ids = $assignment_map[$first_var_id];
|
|
unset($assignment_map[$first_var_id]);
|
|
|
|
foreach ($assignment_var_ids as $assignment_var_id => $_) {
|
|
$depth = 1;
|
|
|
|
if (isset($assignment_map[$assignment_var_id])) {
|
|
$depth = 1 + self::getAssignmentMapDepth($assignment_var_id, $assignment_map);
|
|
}
|
|
|
|
if ($depth > $max_depth) {
|
|
$max_depth = $depth;
|
|
}
|
|
}
|
|
|
|
return $max_depth;
|
|
}
|
|
}
|