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1639 lines
61 KiB
PHP
1639 lines
61 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\Codebase;
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use Psalm\Internal\Analyzer\AlgebraAnalyzer;
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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\Analyzer\TypeAnalyzer;
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use Psalm\Internal\Clause;
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use Psalm\CodeLocation;
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use Psalm\Context;
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use Psalm\Issue\ConflictingReferenceConstraint;
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use Psalm\IssueBuffer;
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use Psalm\Internal\Scope\IfScope;
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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 IfAnalyzer
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{
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/**
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* System of type substitution and deletion
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*
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* for example
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*
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* x: A|null
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*
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* if (x)
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* (x: A)
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* x = B -- effects: remove A from the type of x, add B
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* else
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* (x: null)
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* x = C -- effects: remove null from the type of x, add C
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*
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*
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* x: A|null
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*
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* if (!x)
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* (x: null)
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* throw new Exception -- effects: remove null from the type of x
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*
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* @param StatementsAnalyzer $statements_analyzer
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* @param PhpParser\Node\Stmt\If_ $stmt
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* @param Context $context
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*
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* @return null|false
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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\If_ $stmt,
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Context $context
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) {
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$codebase = $statements_analyzer->getCodebase();
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// get the first expression in the if, which should be evaluated on its own
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// this allows us to update the context of $matches in
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// if (!preg_match('/a/', 'aa', $matches)) {
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// exit
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// }
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// echo $matches[0];
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$first_if_cond_expr = self::getDefinitelyEvaluatedExpression($stmt->cond);
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$context->inside_conditional = true;
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$pre_condition_vars_in_scope = $context->vars_in_scope;
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$referenced_var_ids = $context->referenced_var_ids;
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$context->referenced_var_ids = [];
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$pre_assigned_var_ids = $context->assigned_var_ids;
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$context->assigned_var_ids = [];
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if ($first_if_cond_expr &&
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ExpressionAnalyzer::analyze($statements_analyzer, $first_if_cond_expr, $context) === false
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) {
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return false;
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}
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$first_cond_assigned_var_ids = $context->assigned_var_ids;
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$context->assigned_var_ids = array_merge(
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$pre_assigned_var_ids,
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$first_cond_assigned_var_ids
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);
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$first_cond_referenced_var_ids = $context->referenced_var_ids;
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$context->referenced_var_ids = array_merge(
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$referenced_var_ids,
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$first_cond_referenced_var_ids
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);
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$context->inside_conditional = false;
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$if_scope = new IfScope();
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$if_context = clone $context;
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if ($codebase->alter_code) {
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$if_context->branch_point = $if_context->branch_point ?: (int) $stmt->getAttribute('startFilePos');
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}
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// we need to clone the current context so our ongoing updates to $context don't mess with elseif/else blocks
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$original_context = clone $context;
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$if_context->inside_conditional = true;
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if ($first_if_cond_expr !== $stmt->cond) {
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$assigned_var_ids = $context->assigned_var_ids;
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$if_context->assigned_var_ids = [];
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$referenced_var_ids = $context->referenced_var_ids;
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$if_context->referenced_var_ids = [];
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if (ExpressionAnalyzer::analyze($statements_analyzer, $stmt->cond, $if_context) === false) {
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return false;
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}
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/** @var array<string, bool> */
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$more_cond_referenced_var_ids = $if_context->referenced_var_ids;
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$if_context->referenced_var_ids = array_merge(
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$more_cond_referenced_var_ids,
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$referenced_var_ids
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);
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$cond_referenced_var_ids = array_merge(
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$first_cond_referenced_var_ids,
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$more_cond_referenced_var_ids
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);
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/** @var array<string, bool> */
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$more_cond_assigned_var_ids = $if_context->assigned_var_ids;
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$if_context->assigned_var_ids = array_merge(
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$more_cond_assigned_var_ids,
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$assigned_var_ids
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);
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$cond_assigned_var_ids = array_merge(
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$first_cond_assigned_var_ids,
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$more_cond_assigned_var_ids
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);
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} else {
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$cond_referenced_var_ids = $first_cond_referenced_var_ids;
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$cond_assigned_var_ids = $first_cond_assigned_var_ids;
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}
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$newish_var_ids = array_map(
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/**
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* @param Type\Union $_
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*
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* @return true
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*/
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function (Type\Union $_) {
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return true;
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},
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array_diff_key(
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$if_context->vars_in_scope,
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$pre_condition_vars_in_scope,
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$cond_referenced_var_ids,
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$cond_assigned_var_ids
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)
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);
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// get all the var ids that were referened in the conditional, but not assigned in it
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$cond_referenced_var_ids = array_diff_key($cond_referenced_var_ids, $cond_assigned_var_ids);
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// remove all newly-asserted var ids too
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$cond_referenced_var_ids = array_filter(
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$cond_referenced_var_ids,
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/**
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* @param string $var_id
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*
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* @return bool
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*/
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function ($var_id) use ($pre_condition_vars_in_scope) {
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return isset($pre_condition_vars_in_scope[$var_id]);
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},
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ARRAY_FILTER_USE_KEY
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);
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$cond_referenced_var_ids = array_merge($newish_var_ids, $cond_referenced_var_ids);
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$if_context->inside_conditional = false;
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$mixed_var_ids = [];
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foreach ($if_context->vars_in_scope as $var_id => $type) {
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if ($type->hasMixed()) {
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$mixed_var_ids[] = $var_id;
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}
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}
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$if_clauses = Algebra::getFormula(
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$stmt->cond,
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$context->self,
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$statements_analyzer,
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$codebase
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);
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$if_clauses = array_values(
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array_map(
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/**
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* @return Clause
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*/
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function (Clause $c) use ($mixed_var_ids) {
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$keys = array_keys($c->possibilities);
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foreach ($keys as $key) {
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foreach ($mixed_var_ids as $mixed_var_id) {
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if (preg_match('/^' . preg_quote($mixed_var_id, '/') . '(\[|-)/', $key)) {
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return new Clause([], true);
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}
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}
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}
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return $c;
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},
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$if_clauses
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)
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);
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// this will see whether any of the clauses in set A conflict with the clauses in set B
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AlgebraAnalyzer::checkForParadox(
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$context->clauses,
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$if_clauses,
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$statements_analyzer,
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$stmt->cond,
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$cond_assigned_var_ids
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);
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// if we have assignments in the if, we may have duplicate clauses
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if ($cond_assigned_var_ids) {
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$if_clauses = Algebra::simplifyCNF($if_clauses);
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}
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$if_context->clauses = Algebra::simplifyCNF(array_merge($context->clauses, $if_clauses));
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// define this before we alter local claues after reconciliation
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$if_scope->reasonable_clauses = $if_context->clauses;
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try {
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$if_scope->negated_clauses = Algebra::negateFormula($if_clauses);
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} catch (\Psalm\Exception\ComplicatedExpressionException $e) {
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$if_scope->negated_clauses = [];
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}
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$if_scope->negated_types = Algebra::getTruthsFromFormula(
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Algebra::simplifyCNF(
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array_merge($context->clauses, $if_scope->negated_clauses)
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)
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);
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$reconcilable_if_types = Algebra::getTruthsFromFormula(
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$if_context->clauses,
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$cond_referenced_var_ids
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);
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// if the if has an || in the conditional, we cannot easily reason about it
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if ($reconcilable_if_types) {
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$changed_var_ids = [];
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$if_vars_in_scope_reconciled =
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Reconciler::reconcileKeyedTypes(
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$reconcilable_if_types,
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$if_context->vars_in_scope,
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$changed_var_ids,
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$cond_referenced_var_ids,
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$statements_analyzer,
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[],
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$if_context->inside_loop,
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$context->check_variables
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? new CodeLocation(
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$statements_analyzer->getSource(),
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$stmt->cond,
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$context->include_location
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) : null
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);
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$if_context->vars_in_scope = $if_vars_in_scope_reconciled;
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foreach ($reconcilable_if_types as $var_id => $_) {
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$if_context->vars_possibly_in_scope[$var_id] = true;
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}
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if ($changed_var_ids) {
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$if_context->removeReconciledClauses($changed_var_ids);
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}
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$if_scope->if_cond_changed_var_ids = $changed_var_ids;
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}
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$old_if_context = clone $if_context;
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$context->vars_possibly_in_scope = array_merge(
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$if_context->vars_possibly_in_scope,
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$context->vars_possibly_in_scope
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);
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$context->referenced_var_ids = array_merge(
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$if_context->referenced_var_ids,
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$context->referenced_var_ids
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);
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$temp_else_context = clone $original_context;
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$changed_var_ids = [];
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if ($if_scope->negated_types) {
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$else_vars_reconciled = Reconciler::reconcileKeyedTypes(
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$if_scope->negated_types,
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$temp_else_context->vars_in_scope,
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$changed_var_ids,
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$stmt->else || $stmt->elseifs ? $cond_referenced_var_ids : [],
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$statements_analyzer,
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[],
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$context->inside_loop,
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$context->check_variables
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? new CodeLocation(
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$statements_analyzer->getSource(),
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$stmt->cond,
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$context->include_location
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) : null
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);
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$temp_else_context->vars_in_scope = $else_vars_reconciled;
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}
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// we calculate the vars redefined in a hypothetical else statement to determine
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// which vars of the if we can safely change
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$pre_assignment_else_redefined_vars = $temp_else_context->getRedefinedVars($context->vars_in_scope, true);
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// this captures statements in the if conditional
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if ($context->collect_references) {
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foreach ($if_context->unreferenced_vars as $var_id => $locations) {
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if (!isset($context->unreferenced_vars[$var_id])) {
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if (isset($if_scope->new_unreferenced_vars[$var_id])) {
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$if_scope->new_unreferenced_vars[$var_id] += $locations;
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} else {
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$if_scope->new_unreferenced_vars[$var_id] = $locations;
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}
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} else {
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$new_locations = array_diff_key(
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$locations,
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$context->unreferenced_vars[$var_id]
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);
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if ($new_locations) {
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if (isset($if_scope->new_unreferenced_vars[$var_id])) {
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$if_scope->new_unreferenced_vars[$var_id] += $locations;
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} else {
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$if_scope->new_unreferenced_vars[$var_id] = $locations;
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}
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}
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}
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}
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}
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// check the if
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if (self::analyzeIfBlock(
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$statements_analyzer,
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$stmt,
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$if_scope,
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$if_context,
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$old_if_context,
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$context,
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$pre_assignment_else_redefined_vars
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) === false) {
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return false;
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}
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// check the elseifs
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foreach ($stmt->elseifs as $elseif) {
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$elseif_context = clone $original_context;
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if ($codebase->alter_code) {
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$elseif_context->branch_point =
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$elseif_context->branch_point ?: (int) $stmt->getAttribute('startFilePos');
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}
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if (self::analyzeElseIfBlock(
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$statements_analyzer,
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$elseif,
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$if_scope,
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$elseif_context,
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$context,
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$codebase
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) === false) {
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return false;
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}
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}
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// check the else
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$else_context = clone $original_context;
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if ($stmt->else) {
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if ($codebase->alter_code) {
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$else_context->branch_point =
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$else_context->branch_point ?: (int) $stmt->getAttribute('startFilePos');
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}
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}
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if (self::analyzeElseBlock(
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$statements_analyzer,
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$stmt->else,
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$if_scope,
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$else_context,
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$context
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) === false) {
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return false;
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}
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if ($context->loop_scope) {
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$context->loop_scope->final_actions = array_unique(
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array_merge(
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$context->loop_scope->final_actions,
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$if_scope->final_actions
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)
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);
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}
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$context->vars_possibly_in_scope = array_merge(
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$context->vars_possibly_in_scope,
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$if_scope->new_vars_possibly_in_scope
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);
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$context->possibly_assigned_var_ids = array_merge(
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$context->possibly_assigned_var_ids,
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$if_scope->possibly_assigned_var_ids ?: []
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);
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// vars can only be defined/redefined if there was an else (defined in every block)
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$context->assigned_var_ids = array_merge(
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$context->assigned_var_ids,
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$if_scope->assigned_var_ids ?: []
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);
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if ($if_scope->new_vars) {
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$context->vars_in_scope = array_merge($context->vars_in_scope, $if_scope->new_vars);
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}
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if ($if_scope->redefined_vars) {
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foreach ($if_scope->redefined_vars as $var_id => $type) {
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$context->vars_in_scope[$var_id] = $type;
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$if_scope->updated_vars[$var_id] = true;
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if ($if_scope->reasonable_clauses) {
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$if_scope->reasonable_clauses = Context::filterClauses(
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$var_id,
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$if_scope->reasonable_clauses,
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isset($context->vars_in_scope[$var_id])
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? $context->vars_in_scope[$var_id]
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: null,
|
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$statements_analyzer
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);
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}
|
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}
|
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}
|
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|
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if ($if_scope->possible_param_types) {
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foreach ($if_scope->possible_param_types as $var => $type) {
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$context->possible_param_types[$var] = $type;
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}
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}
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|
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if ($if_scope->reasonable_clauses
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&& (count($if_scope->reasonable_clauses) > 1 || !$if_scope->reasonable_clauses[0]->wedge)
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) {
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$context->clauses = Algebra::simplifyCNF(
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array_merge(
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$if_scope->reasonable_clauses,
|
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$context->clauses
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)
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);
|
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}
|
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|
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if ($if_scope->possibly_redefined_vars) {
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foreach ($if_scope->possibly_redefined_vars as $var_id => $type) {
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if (isset($context->vars_in_scope[$var_id])
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&& !$type->failed_reconciliation
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&& !isset($if_scope->updated_vars[$var_id])
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) {
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$combined_type = Type::combineUnionTypes(
|
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$context->vars_in_scope[$var_id],
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$type,
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$codebase
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);
|
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if ($combined_type->equals($context->vars_in_scope[$var_id])) {
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continue;
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}
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$context->removeDescendents($var_id, $combined_type);
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$context->vars_in_scope[$var_id] = $combined_type;
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}
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}
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}
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|
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if ($context->collect_references) {
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foreach ($if_scope->new_unreferenced_vars as $var_id => $locations) {
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if (($stmt->else
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&& (isset($if_scope->assigned_var_ids[$var_id]) || isset($if_scope->new_vars[$var_id])))
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|| !isset($context->vars_in_scope[$var_id])
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) {
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$context->unreferenced_vars[$var_id] = $locations;
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} elseif (isset($if_scope->possibly_assigned_var_ids[$var_id])) {
|
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if (!isset($context->unreferenced_vars[$var_id])) {
|
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$context->unreferenced_vars[$var_id] = $locations;
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} else {
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$context->unreferenced_vars[$var_id] += $locations;
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}
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} else {
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$statements_analyzer->registerVariableUses($locations);
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}
|
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}
|
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$context->possibly_assigned_var_ids += $if_scope->possibly_assigned_var_ids;
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}
|
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return null;
|
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}
|
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|
|
/**
|
|
* @param StatementsAnalyzer $statements_analyzer
|
|
* @param PhpParser\Node\Stmt\If_ $stmt
|
|
* @param IfScope $if_scope
|
|
* @param Context $if_context
|
|
* @param Context $old_if_context
|
|
* @param Context $outer_context
|
|
* @param array<string,Type\Union> $pre_assignment_else_redefined_vars
|
|
*
|
|
* @return false|null
|
|
*/
|
|
protected static function analyzeIfBlock(
|
|
StatementsAnalyzer $statements_analyzer,
|
|
PhpParser\Node\Stmt\If_ $stmt,
|
|
IfScope $if_scope,
|
|
Context $if_context,
|
|
Context $old_if_context,
|
|
Context $outer_context,
|
|
array $pre_assignment_else_redefined_vars
|
|
) {
|
|
$codebase = $statements_analyzer->getCodebase();
|
|
|
|
$if_context->parent_context = $outer_context;
|
|
|
|
$assigned_var_ids = $if_context->assigned_var_ids;
|
|
$possibly_assigned_var_ids = $if_context->possibly_assigned_var_ids;
|
|
$if_context->assigned_var_ids = [];
|
|
$if_context->possibly_assigned_var_ids = [];
|
|
|
|
if ($statements_analyzer->analyze(
|
|
$stmt->stmts,
|
|
$if_context
|
|
) === false
|
|
) {
|
|
return false;
|
|
}
|
|
|
|
$final_actions = ScopeAnalyzer::getFinalControlActions(
|
|
$stmt->stmts,
|
|
$codebase->config->exit_functions,
|
|
$outer_context->inside_case
|
|
);
|
|
|
|
$has_ending_statements = $final_actions === [ScopeAnalyzer::ACTION_END];
|
|
|
|
$has_leaving_statements = $has_ending_statements
|
|
|| (count($final_actions) && !in_array(ScopeAnalyzer::ACTION_NONE, $final_actions, true));
|
|
|
|
$has_break_statement = $final_actions === [ScopeAnalyzer::ACTION_BREAK];
|
|
$has_continue_statement = $final_actions === [ScopeAnalyzer::ACTION_CONTINUE];
|
|
$has_leave_switch_statement = $final_actions === [ScopeAnalyzer::ACTION_LEAVE_SWITCH];
|
|
|
|
$if_scope->final_actions = $final_actions;
|
|
|
|
/** @var array<string, bool> */
|
|
$new_assigned_var_ids = $if_context->assigned_var_ids;
|
|
/** @var array<string, bool> */
|
|
$new_possibly_assigned_var_ids = $if_context->possibly_assigned_var_ids;
|
|
|
|
$if_context->assigned_var_ids = array_merge($assigned_var_ids, $new_assigned_var_ids);
|
|
$if_context->possibly_assigned_var_ids = array_merge(
|
|
$possibly_assigned_var_ids,
|
|
$new_possibly_assigned_var_ids
|
|
);
|
|
|
|
if ($if_context->byref_constraints !== null) {
|
|
foreach ($if_context->byref_constraints as $var_id => $byref_constraint) {
|
|
if ($outer_context->byref_constraints !== null
|
|
&& isset($outer_context->byref_constraints[$var_id])
|
|
&& $byref_constraint->type
|
|
&& ($outer_constraint_type = $outer_context->byref_constraints[$var_id]->type)
|
|
&& !TypeAnalyzer::isContainedBy(
|
|
$codebase,
|
|
$byref_constraint->type,
|
|
$outer_constraint_type
|
|
)
|
|
) {
|
|
if (IssueBuffer::accepts(
|
|
new ConflictingReferenceConstraint(
|
|
'There is more than one pass-by-reference constraint on ' . $var_id,
|
|
new CodeLocation($statements_analyzer, $stmt, $outer_context->include_location, true)
|
|
),
|
|
$statements_analyzer->getSuppressedIssues()
|
|
)) {
|
|
// fall through
|
|
}
|
|
} else {
|
|
$outer_context->byref_constraints[$var_id] = $byref_constraint;
|
|
}
|
|
}
|
|
}
|
|
|
|
if ($outer_context->collect_references) {
|
|
$outer_context->referenced_var_ids = array_merge(
|
|
$outer_context->referenced_var_ids,
|
|
$if_context->referenced_var_ids
|
|
);
|
|
}
|
|
|
|
$mic_drop = false;
|
|
|
|
if (!$has_leaving_statements) {
|
|
$if_scope->new_vars = array_diff_key($if_context->vars_in_scope, $outer_context->vars_in_scope);
|
|
|
|
$if_scope->redefined_vars = $if_context->getRedefinedVars($outer_context->vars_in_scope);
|
|
$if_scope->possibly_redefined_vars = $if_scope->redefined_vars;
|
|
$if_scope->assigned_var_ids = $new_assigned_var_ids;
|
|
$if_scope->possibly_assigned_var_ids = $new_possibly_assigned_var_ids;
|
|
|
|
$changed_var_ids = array_keys($new_assigned_var_ids);
|
|
|
|
// if the variable was only set in the conditional, it's not possibly redefined
|
|
foreach ($if_scope->possibly_redefined_vars as $var_id => $_) {
|
|
if (!isset($new_possibly_assigned_var_ids[$var_id])
|
|
&& in_array($var_id, $if_scope->if_cond_changed_var_ids, true)
|
|
) {
|
|
unset($if_scope->possibly_redefined_vars[$var_id]);
|
|
}
|
|
}
|
|
|
|
if ($if_scope->reasonable_clauses) {
|
|
// remove all reasonable clauses that would be negated by the if stmts
|
|
foreach ($changed_var_ids as $var_id) {
|
|
$if_scope->reasonable_clauses = Context::filterClauses(
|
|
$var_id,
|
|
$if_scope->reasonable_clauses,
|
|
isset($if_context->vars_in_scope[$var_id]) ? $if_context->vars_in_scope[$var_id] : null,
|
|
$statements_analyzer
|
|
);
|
|
}
|
|
}
|
|
|
|
if ($if_context->infer_types) {
|
|
$if_scope->possible_param_types = $if_context->possible_param_types;
|
|
}
|
|
} else {
|
|
if (!$has_break_statement) {
|
|
$if_scope->reasonable_clauses = [];
|
|
}
|
|
}
|
|
|
|
if ($has_leaving_statements && !$has_break_statement && !$stmt->else && !$stmt->elseifs) {
|
|
if ($if_scope->negated_types) {
|
|
$changed_var_ids = [];
|
|
|
|
$outer_context_vars_reconciled = Reconciler::reconcileKeyedTypes(
|
|
$if_scope->negated_types,
|
|
$outer_context->vars_in_scope,
|
|
$changed_var_ids,
|
|
[],
|
|
$statements_analyzer,
|
|
[],
|
|
$outer_context->inside_loop,
|
|
new CodeLocation(
|
|
$statements_analyzer->getSource(),
|
|
$stmt->cond,
|
|
$outer_context->include_location,
|
|
false
|
|
)
|
|
);
|
|
|
|
foreach ($changed_var_ids as $changed_var_id) {
|
|
$outer_context->removeVarFromConflictingClauses($changed_var_id);
|
|
}
|
|
|
|
$changed_var_ids = array_unique(
|
|
array_merge(
|
|
$changed_var_ids,
|
|
array_keys($new_assigned_var_ids)
|
|
)
|
|
);
|
|
|
|
foreach ($changed_var_ids as $var_id) {
|
|
$if_scope->negated_clauses = Context::filterClauses(
|
|
$var_id,
|
|
$if_scope->negated_clauses
|
|
);
|
|
}
|
|
|
|
$outer_context->vars_in_scope = $outer_context_vars_reconciled;
|
|
$mic_drop = true;
|
|
}
|
|
|
|
$outer_context->clauses = Algebra::simplifyCNF(
|
|
array_merge($outer_context->clauses, $if_scope->negated_clauses)
|
|
);
|
|
}
|
|
|
|
// update the parent context as necessary, but only if we can safely reason about type negation.
|
|
// We only update vars that changed both at the start of the if block and then again by an assignment
|
|
// in the if statement.
|
|
if ($if_scope->negated_types && !$mic_drop) {
|
|
$vars_to_update = array_intersect(
|
|
array_keys($pre_assignment_else_redefined_vars),
|
|
array_keys($if_scope->negated_types)
|
|
);
|
|
|
|
$extra_vars_to_update = [];
|
|
|
|
// if there's an object-like array in there, we also need to update the root array variable
|
|
foreach ($vars_to_update as $var_id) {
|
|
$bracked_pos = strpos($var_id, '[');
|
|
if ($bracked_pos !== false) {
|
|
$extra_vars_to_update[] = substr($var_id, 0, $bracked_pos);
|
|
}
|
|
}
|
|
|
|
if ($extra_vars_to_update) {
|
|
$vars_to_update = array_unique(array_merge($extra_vars_to_update, $vars_to_update));
|
|
}
|
|
|
|
//update $if_context vars to include the pre-assignment else vars
|
|
if (!$stmt->else && !$has_leaving_statements) {
|
|
foreach ($pre_assignment_else_redefined_vars as $var_id => $type) {
|
|
if (isset($if_context->vars_in_scope[$var_id])) {
|
|
$if_context->vars_in_scope[$var_id] = Type::combineUnionTypes(
|
|
$if_context->vars_in_scope[$var_id],
|
|
$type
|
|
);
|
|
}
|
|
}
|
|
}
|
|
|
|
$outer_context->update(
|
|
$old_if_context,
|
|
$if_context,
|
|
$has_leaving_statements,
|
|
$vars_to_update,
|
|
$if_scope->updated_vars
|
|
);
|
|
}
|
|
|
|
if (!$has_ending_statements) {
|
|
$vars_possibly_in_scope = array_diff_key(
|
|
$if_context->vars_possibly_in_scope,
|
|
$outer_context->vars_possibly_in_scope
|
|
);
|
|
|
|
if ($if_context->loop_scope) {
|
|
if (!$has_continue_statement && !$has_break_statement) {
|
|
$if_scope->new_vars_possibly_in_scope = $vars_possibly_in_scope;
|
|
}
|
|
|
|
$if_context->loop_scope->vars_possibly_in_scope = array_merge(
|
|
$vars_possibly_in_scope,
|
|
$if_context->loop_scope->vars_possibly_in_scope
|
|
);
|
|
} elseif (!$has_leaving_statements) {
|
|
$if_scope->new_vars_possibly_in_scope = $vars_possibly_in_scope;
|
|
}
|
|
|
|
if ($if_context->collect_references && (!$has_leaving_statements || $has_leave_switch_statement)) {
|
|
foreach ($if_context->unreferenced_vars as $var_id => $locations) {
|
|
if (!isset($outer_context->unreferenced_vars[$var_id])) {
|
|
if (isset($if_scope->new_unreferenced_vars[$var_id])) {
|
|
$if_scope->new_unreferenced_vars[$var_id] += $locations;
|
|
} else {
|
|
$if_scope->new_unreferenced_vars[$var_id] = $locations;
|
|
}
|
|
} else {
|
|
$new_locations = array_diff_key(
|
|
$locations,
|
|
$outer_context->unreferenced_vars[$var_id]
|
|
);
|
|
|
|
if ($new_locations) {
|
|
if (isset($if_scope->new_unreferenced_vars[$var_id])) {
|
|
$if_scope->new_unreferenced_vars[$var_id] += $locations;
|
|
} else {
|
|
$if_scope->new_unreferenced_vars[$var_id] = $locations;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if ($outer_context->collect_exceptions) {
|
|
$outer_context->possibly_thrown_exceptions += $if_context->possibly_thrown_exceptions;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param StatementsAnalyzer $statements_analyzer
|
|
* @param PhpParser\Node\Stmt\ElseIf_ $elseif
|
|
* @param IfScope $if_scope
|
|
* @param Context $elseif_context
|
|
* @param Context $outer_context
|
|
*
|
|
* @return false|null
|
|
*/
|
|
protected static function analyzeElseIfBlock(
|
|
StatementsAnalyzer $statements_analyzer,
|
|
PhpParser\Node\Stmt\ElseIf_ $elseif,
|
|
IfScope $if_scope,
|
|
Context $elseif_context,
|
|
Context $outer_context,
|
|
Codebase $codebase
|
|
) {
|
|
$original_context = clone $elseif_context;
|
|
|
|
$entry_clauses = array_merge($original_context->clauses, $if_scope->negated_clauses);
|
|
|
|
$changed_var_ids = [];
|
|
|
|
if ($if_scope->negated_types) {
|
|
$elseif_vars_reconciled = Reconciler::reconcileKeyedTypes(
|
|
$if_scope->negated_types,
|
|
$elseif_context->vars_in_scope,
|
|
$changed_var_ids,
|
|
[],
|
|
$statements_analyzer,
|
|
[],
|
|
$elseif_context->inside_loop,
|
|
new CodeLocation(
|
|
$statements_analyzer->getSource(),
|
|
$elseif->cond,
|
|
$outer_context->include_location,
|
|
false
|
|
)
|
|
);
|
|
|
|
$elseif_context->vars_in_scope = $elseif_vars_reconciled;
|
|
|
|
if ($changed_var_ids) {
|
|
$entry_clauses = array_filter(
|
|
$entry_clauses,
|
|
/** @return bool */
|
|
function (Clause $c) use ($changed_var_ids) {
|
|
return count($c->possibilities) > 1
|
|
|| $c->wedge
|
|
|| !in_array(array_keys($c->possibilities)[0], $changed_var_ids, true);
|
|
}
|
|
);
|
|
}
|
|
}
|
|
|
|
$pre_conditional_context = clone $elseif_context;
|
|
|
|
$elseif_context->inside_conditional = true;
|
|
|
|
$pre_assigned_var_ids = $elseif_context->assigned_var_ids;
|
|
|
|
$referenced_var_ids = $elseif_context->referenced_var_ids;
|
|
$elseif_context->referenced_var_ids = [];
|
|
|
|
// check the elseif
|
|
if (ExpressionAnalyzer::analyze($statements_analyzer, $elseif->cond, $elseif_context) === false) {
|
|
return false;
|
|
}
|
|
|
|
$new_referenced_var_ids = $elseif_context->referenced_var_ids;
|
|
$elseif_context->referenced_var_ids = array_merge(
|
|
$referenced_var_ids,
|
|
$elseif_context->referenced_var_ids
|
|
);
|
|
|
|
$conditional_assigned_var_ids = $elseif_context->assigned_var_ids;
|
|
|
|
$elseif_context->assigned_var_ids = array_merge(
|
|
$pre_assigned_var_ids,
|
|
$conditional_assigned_var_ids
|
|
);
|
|
|
|
$new_assigned_var_ids = array_diff_key(
|
|
$conditional_assigned_var_ids,
|
|
$pre_assigned_var_ids
|
|
);
|
|
|
|
$new_referenced_var_ids = array_diff_key($new_referenced_var_ids, $new_assigned_var_ids);
|
|
|
|
$elseif_context->inside_conditional = false;
|
|
|
|
$mixed_var_ids = [];
|
|
|
|
foreach ($elseif_context->vars_in_scope as $var_id => $type) {
|
|
if ($type->hasMixed()) {
|
|
$mixed_var_ids[] = $var_id;
|
|
}
|
|
}
|
|
|
|
$elseif_clauses = Algebra::getFormula(
|
|
$elseif->cond,
|
|
$statements_analyzer->getFQCLN(),
|
|
$statements_analyzer,
|
|
$codebase
|
|
);
|
|
|
|
$elseif_clauses = array_map(
|
|
/**
|
|
* @return Clause
|
|
*/
|
|
function (Clause $c) use ($mixed_var_ids) {
|
|
$keys = array_keys($c->possibilities);
|
|
|
|
foreach ($keys as $key) {
|
|
foreach ($mixed_var_ids as $mixed_var_id) {
|
|
if (preg_match('/^' . preg_quote($mixed_var_id, '/') . '(\[|-)/', $key)) {
|
|
return new Clause([], true);
|
|
}
|
|
}
|
|
}
|
|
|
|
return $c;
|
|
},
|
|
$elseif_clauses
|
|
);
|
|
|
|
$entry_clauses = array_map(
|
|
/**
|
|
* @return Clause
|
|
*/
|
|
function (Clause $c) use ($conditional_assigned_var_ids) {
|
|
$keys = array_keys($c->possibilities);
|
|
|
|
foreach ($keys as $key) {
|
|
foreach ($conditional_assigned_var_ids as $conditional_assigned_var_id => $_) {
|
|
if (preg_match('/^' . preg_quote($conditional_assigned_var_id, '/') . '(\[|-|$)/', $key)) {
|
|
return new Clause([], true);
|
|
}
|
|
}
|
|
}
|
|
|
|
return $c;
|
|
},
|
|
$entry_clauses
|
|
);
|
|
|
|
// this will see whether any of the clauses in set A conflict with the clauses in set B
|
|
AlgebraAnalyzer::checkForParadox(
|
|
$entry_clauses,
|
|
$elseif_clauses,
|
|
$statements_analyzer,
|
|
$elseif->cond,
|
|
$new_assigned_var_ids
|
|
);
|
|
|
|
$elseif_context->clauses = Algebra::simplifyCNF(
|
|
array_merge(
|
|
$entry_clauses,
|
|
$elseif_clauses
|
|
)
|
|
);
|
|
|
|
$reconcilable_elseif_types = Algebra::getTruthsFromFormula($elseif_context->clauses);
|
|
$negated_elseif_types = Algebra::getTruthsFromFormula(Algebra::negateFormula($elseif_clauses));
|
|
|
|
$all_negated_vars = array_unique(
|
|
array_merge(
|
|
array_keys($negated_elseif_types),
|
|
array_keys($if_scope->negated_types)
|
|
)
|
|
);
|
|
|
|
foreach ($all_negated_vars as $var_id) {
|
|
if (isset($negated_elseif_types[$var_id])) {
|
|
if (isset($if_scope->negated_types[$var_id])) {
|
|
$if_scope->negated_types[$var_id] = array_merge(
|
|
$if_scope->negated_types[$var_id],
|
|
$negated_elseif_types[$var_id]
|
|
);
|
|
} else {
|
|
$if_scope->negated_types[$var_id] = $negated_elseif_types[$var_id];
|
|
}
|
|
}
|
|
}
|
|
|
|
$changed_var_ids = $changed_var_ids ?: [];
|
|
|
|
// if the elseif has an || in the conditional, we cannot easily reason about it
|
|
if ($reconcilable_elseif_types) {
|
|
$elseif_vars_reconciled = Reconciler::reconcileKeyedTypes(
|
|
$reconcilable_elseif_types,
|
|
$elseif_context->vars_in_scope,
|
|
$changed_var_ids,
|
|
$new_referenced_var_ids,
|
|
$statements_analyzer,
|
|
[],
|
|
$elseif_context->inside_loop,
|
|
new CodeLocation($statements_analyzer->getSource(), $elseif->cond, $outer_context->include_location)
|
|
);
|
|
|
|
$elseif_context->vars_in_scope = $elseif_vars_reconciled;
|
|
|
|
if ($changed_var_ids) {
|
|
$elseif_context->removeReconciledClauses($changed_var_ids);
|
|
}
|
|
}
|
|
|
|
$old_elseif_context = clone $elseif_context;
|
|
|
|
$pre_stmts_assigned_var_ids = $elseif_context->assigned_var_ids;
|
|
$elseif_context->assigned_var_ids = [];
|
|
$pre_stmts_possibly_assigned_var_ids = $elseif_context->possibly_assigned_var_ids;
|
|
$elseif_context->possibly_assigned_var_ids = [];
|
|
|
|
if ($statements_analyzer->analyze(
|
|
$elseif->stmts,
|
|
$elseif_context
|
|
) === false
|
|
) {
|
|
return false;
|
|
}
|
|
|
|
/** @var array<string, bool> */
|
|
$new_stmts_assigned_var_ids = $elseif_context->assigned_var_ids;
|
|
$elseif_context->assigned_var_ids = $pre_stmts_assigned_var_ids + $new_stmts_assigned_var_ids;
|
|
|
|
/** @var array<string, bool> */
|
|
$new_stmts_possibly_assigned_var_ids = $elseif_context->possibly_assigned_var_ids;
|
|
$elseif_context->possibly_assigned_var_ids =
|
|
$pre_stmts_possibly_assigned_var_ids + $new_stmts_possibly_assigned_var_ids;
|
|
|
|
if ($elseif_context->byref_constraints !== null) {
|
|
foreach ($elseif_context->byref_constraints as $var_id => $byref_constraint) {
|
|
if ($outer_context->byref_constraints !== null
|
|
&& isset($outer_context->byref_constraints[$var_id])
|
|
&& ($outer_constraint_type = $outer_context->byref_constraints[$var_id]->type)
|
|
&& $byref_constraint->type
|
|
&& !TypeAnalyzer::isContainedBy(
|
|
$codebase,
|
|
$byref_constraint->type,
|
|
$outer_constraint_type
|
|
)
|
|
) {
|
|
if (IssueBuffer::accepts(
|
|
new ConflictingReferenceConstraint(
|
|
'There is more than one pass-by-reference constraint on ' . $var_id,
|
|
new CodeLocation($statements_analyzer, $elseif, $outer_context->include_location, true)
|
|
),
|
|
$statements_analyzer->getSuppressedIssues()
|
|
)) {
|
|
// fall through
|
|
}
|
|
} else {
|
|
$outer_context->byref_constraints[$var_id] = $byref_constraint;
|
|
}
|
|
}
|
|
}
|
|
|
|
$final_actions = ScopeAnalyzer::getFinalControlActions(
|
|
$elseif->stmts,
|
|
$codebase->config->exit_functions,
|
|
$outer_context->inside_case
|
|
);
|
|
// has a return/throw at end
|
|
$has_ending_statements = $final_actions === [ScopeAnalyzer::ACTION_END];
|
|
$has_leaving_statements = $has_ending_statements
|
|
|| (count($final_actions) && !in_array(ScopeAnalyzer::ACTION_NONE, $final_actions, true));
|
|
|
|
$has_break_statement = $final_actions === [ScopeAnalyzer::ACTION_BREAK];
|
|
$has_continue_statement = $final_actions === [ScopeAnalyzer::ACTION_CONTINUE];
|
|
$has_leave_switch_statement = $final_actions === [ScopeAnalyzer::ACTION_LEAVE_SWITCH];
|
|
|
|
$if_scope->final_actions = array_merge($final_actions, $if_scope->final_actions);
|
|
|
|
// update the parent context as necessary
|
|
$elseif_redefined_vars = $elseif_context->getRedefinedVars($original_context->vars_in_scope);
|
|
|
|
if (!$has_leaving_statements) {
|
|
if ($if_scope->new_vars === null) {
|
|
$if_scope->new_vars = array_diff_key($elseif_context->vars_in_scope, $outer_context->vars_in_scope);
|
|
} else {
|
|
foreach ($if_scope->new_vars as $new_var => $type) {
|
|
if (!$elseif_context->hasVariable($new_var, $statements_analyzer)) {
|
|
unset($if_scope->new_vars[$new_var]);
|
|
} else {
|
|
$if_scope->new_vars[$new_var] = Type::combineUnionTypes(
|
|
$type,
|
|
$elseif_context->vars_in_scope[$new_var]
|
|
);
|
|
}
|
|
}
|
|
}
|
|
|
|
$possibly_redefined_vars = $elseif_redefined_vars;
|
|
|
|
foreach ($possibly_redefined_vars as $var_id => $_) {
|
|
if (!isset($new_stmts_assigned_var_ids[$var_id])
|
|
&& in_array($var_id, $changed_var_ids, true)
|
|
) {
|
|
unset($possibly_redefined_vars[$var_id]);
|
|
}
|
|
}
|
|
|
|
$assigned_var_ids = array_merge($new_stmts_assigned_var_ids, $new_assigned_var_ids);
|
|
|
|
if ($if_scope->assigned_var_ids === null) {
|
|
$if_scope->assigned_var_ids = $assigned_var_ids;
|
|
} else {
|
|
$if_scope->assigned_var_ids = array_intersect_key($assigned_var_ids, $if_scope->assigned_var_ids);
|
|
}
|
|
|
|
if ($if_scope->redefined_vars === null) {
|
|
$if_scope->redefined_vars = $elseif_redefined_vars;
|
|
$if_scope->possibly_redefined_vars = $possibly_redefined_vars;
|
|
} else {
|
|
foreach ($if_scope->redefined_vars as $redefined_var => $type) {
|
|
if (!isset($elseif_redefined_vars[$redefined_var])) {
|
|
unset($if_scope->redefined_vars[$redefined_var]);
|
|
} else {
|
|
$if_scope->redefined_vars[$redefined_var] = Type::combineUnionTypes(
|
|
$elseif_redefined_vars[$redefined_var],
|
|
$type
|
|
);
|
|
|
|
if (isset($outer_context->vars_in_scope[$redefined_var])
|
|
&& $if_scope->redefined_vars[$redefined_var]->equals(
|
|
$outer_context->vars_in_scope[$redefined_var]
|
|
)
|
|
) {
|
|
unset($if_scope->redefined_vars[$redefined_var]);
|
|
}
|
|
}
|
|
}
|
|
|
|
foreach ($possibly_redefined_vars as $var => $type) {
|
|
if ($type->hasMixed()) {
|
|
$if_scope->possibly_redefined_vars[$var] = $type;
|
|
} elseif (isset($if_scope->possibly_redefined_vars[$var])) {
|
|
$if_scope->possibly_redefined_vars[$var] = Type::combineUnionTypes(
|
|
$type,
|
|
$if_scope->possibly_redefined_vars[$var]
|
|
);
|
|
} else {
|
|
$if_scope->possibly_redefined_vars[$var] = $type;
|
|
}
|
|
}
|
|
}
|
|
|
|
$reasonable_clause_count = count($if_scope->reasonable_clauses);
|
|
|
|
if ($reasonable_clause_count && $reasonable_clause_count < 20000 && $elseif_clauses) {
|
|
$if_scope->reasonable_clauses = Algebra::combineOredClauses(
|
|
$if_scope->reasonable_clauses,
|
|
$elseif_clauses
|
|
);
|
|
} else {
|
|
$if_scope->reasonable_clauses = [];
|
|
}
|
|
} else {
|
|
$if_scope->reasonable_clauses = [];
|
|
}
|
|
|
|
if ($elseif_context->infer_types) {
|
|
$elseif_possible_param_types = $elseif_context->possible_param_types;
|
|
|
|
if ($if_scope->possible_param_types) {
|
|
$vars_to_remove = [];
|
|
|
|
foreach ($if_scope->possible_param_types as $var => $type) {
|
|
if (isset($elseif_possible_param_types[$var])) {
|
|
$if_scope->possible_param_types[$var] = Type::combineUnionTypes(
|
|
$elseif_possible_param_types[$var],
|
|
$type
|
|
);
|
|
} else {
|
|
$vars_to_remove[] = $var;
|
|
}
|
|
}
|
|
|
|
foreach ($vars_to_remove as $var) {
|
|
unset($if_scope->possible_param_types[$var]);
|
|
}
|
|
}
|
|
}
|
|
|
|
if ($negated_elseif_types) {
|
|
if ($has_leaving_statements) {
|
|
$changed_var_ids = [];
|
|
|
|
$leaving_vars_reconciled = Reconciler::reconcileKeyedTypes(
|
|
$negated_elseif_types,
|
|
$pre_conditional_context->vars_in_scope,
|
|
$changed_var_ids,
|
|
[],
|
|
$statements_analyzer,
|
|
[],
|
|
$elseif_context->inside_loop,
|
|
new CodeLocation($statements_analyzer->getSource(), $elseif, $outer_context->include_location)
|
|
);
|
|
|
|
$implied_outer_context = clone $elseif_context;
|
|
$implied_outer_context->vars_in_scope = $leaving_vars_reconciled;
|
|
|
|
$outer_context->update(
|
|
$elseif_context,
|
|
$implied_outer_context,
|
|
false,
|
|
array_keys($negated_elseif_types),
|
|
$if_scope->updated_vars
|
|
);
|
|
} elseif ($entry_clauses && (count($entry_clauses) > 1 || !array_values($entry_clauses)[0]->wedge)) {
|
|
$outer_context->update(
|
|
$old_elseif_context,
|
|
$elseif_context,
|
|
false,
|
|
array_keys($negated_elseif_types),
|
|
$if_scope->updated_vars
|
|
);
|
|
}
|
|
}
|
|
|
|
if (!$has_ending_statements) {
|
|
$vars_possibly_in_scope = array_diff_key(
|
|
$elseif_context->vars_possibly_in_scope,
|
|
$outer_context->vars_possibly_in_scope
|
|
);
|
|
|
|
$possibly_assigned_var_ids = $new_stmts_possibly_assigned_var_ids;
|
|
|
|
if ($has_leaving_statements && $elseif_context->loop_scope) {
|
|
if (!$has_continue_statement && !$has_break_statement) {
|
|
$if_scope->new_vars_possibly_in_scope = array_merge(
|
|
$vars_possibly_in_scope,
|
|
$if_scope->new_vars_possibly_in_scope
|
|
);
|
|
$if_scope->possibly_assigned_var_ids = array_merge(
|
|
$possibly_assigned_var_ids,
|
|
$if_scope->possibly_assigned_var_ids
|
|
);
|
|
}
|
|
|
|
$elseif_context->loop_scope->vars_possibly_in_scope = array_merge(
|
|
$vars_possibly_in_scope,
|
|
$elseif_context->loop_scope->vars_possibly_in_scope
|
|
);
|
|
} elseif (!$has_leaving_statements) {
|
|
$if_scope->new_vars_possibly_in_scope = array_merge(
|
|
$vars_possibly_in_scope,
|
|
$if_scope->new_vars_possibly_in_scope
|
|
);
|
|
$if_scope->possibly_assigned_var_ids = array_merge(
|
|
$possibly_assigned_var_ids,
|
|
$if_scope->possibly_assigned_var_ids
|
|
);
|
|
}
|
|
|
|
if ($outer_context->collect_references && (!$has_leaving_statements || $has_leave_switch_statement)) {
|
|
foreach ($elseif_context->unreferenced_vars as $var_id => $locations) {
|
|
if (!isset($outer_context->unreferenced_vars[$var_id])) {
|
|
if (isset($if_scope->new_unreferenced_vars[$var_id])) {
|
|
$if_scope->new_unreferenced_vars[$var_id] += $locations;
|
|
} else {
|
|
$if_scope->new_unreferenced_vars[$var_id] = $locations;
|
|
}
|
|
} else {
|
|
$new_locations = array_diff_key(
|
|
$locations,
|
|
$outer_context->unreferenced_vars[$var_id]
|
|
);
|
|
|
|
if ($new_locations) {
|
|
if (isset($if_scope->new_unreferenced_vars[$var_id])) {
|
|
$if_scope->new_unreferenced_vars[$var_id] += $locations;
|
|
} else {
|
|
$if_scope->new_unreferenced_vars[$var_id] = $locations;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if ($outer_context->collect_references) {
|
|
$outer_context->referenced_var_ids = array_merge(
|
|
$outer_context->referenced_var_ids,
|
|
$elseif_context->referenced_var_ids
|
|
);
|
|
}
|
|
|
|
if ($outer_context->collect_exceptions) {
|
|
$outer_context->possibly_thrown_exceptions += $elseif_context->possibly_thrown_exceptions;
|
|
}
|
|
|
|
$if_scope->negated_clauses = array_merge(
|
|
$if_scope->negated_clauses,
|
|
Algebra::negateFormula($elseif_clauses)
|
|
);
|
|
}
|
|
|
|
/**
|
|
* @param StatementsAnalyzer $statements_analyzer
|
|
* @param PhpParser\Node\Stmt\Else_|null $else
|
|
* @param IfScope $if_scope
|
|
* @param Context $else_context
|
|
* @param Context $outer_context
|
|
*
|
|
* @return false|null
|
|
*/
|
|
protected static function analyzeElseBlock(
|
|
StatementsAnalyzer $statements_analyzer,
|
|
$else,
|
|
IfScope $if_scope,
|
|
Context $else_context,
|
|
Context $outer_context
|
|
) {
|
|
$codebase = $statements_analyzer->getCodebase();
|
|
|
|
if (!$else && !$if_scope->negated_clauses && !$else_context->clauses) {
|
|
$if_scope->final_actions = array_merge([ScopeAnalyzer::ACTION_NONE], $if_scope->final_actions);
|
|
$if_scope->assigned_var_ids = [];
|
|
$if_scope->new_vars = [];
|
|
$if_scope->redefined_vars = [];
|
|
$if_scope->reasonable_clauses = [];
|
|
|
|
return;
|
|
}
|
|
|
|
$else_context->clauses = Algebra::simplifyCNF(
|
|
array_merge(
|
|
$else_context->clauses,
|
|
$if_scope->negated_clauses
|
|
)
|
|
);
|
|
|
|
$else_types = Algebra::getTruthsFromFormula($else_context->clauses);
|
|
|
|
if (!$else && !$else_types) {
|
|
$if_scope->final_actions = array_merge([ScopeAnalyzer::ACTION_NONE], $if_scope->final_actions);
|
|
$if_scope->assigned_var_ids = [];
|
|
$if_scope->new_vars = [];
|
|
$if_scope->redefined_vars = [];
|
|
$if_scope->reasonable_clauses = [];
|
|
|
|
return;
|
|
}
|
|
|
|
$original_context = clone $else_context;
|
|
|
|
if ($else_types) {
|
|
$changed_var_ids = [];
|
|
|
|
$else_vars_reconciled = Reconciler::reconcileKeyedTypes(
|
|
$else_types,
|
|
$else_context->vars_in_scope,
|
|
$changed_var_ids,
|
|
[],
|
|
$statements_analyzer,
|
|
[],
|
|
$else_context->inside_loop,
|
|
$else
|
|
? new CodeLocation($statements_analyzer->getSource(), $else, $outer_context->include_location)
|
|
: null
|
|
);
|
|
|
|
$else_context->vars_in_scope = $else_vars_reconciled;
|
|
|
|
$else_context->removeReconciledClauses($changed_var_ids);
|
|
}
|
|
|
|
$old_else_context = clone $else_context;
|
|
|
|
$pre_stmts_assigned_var_ids = $else_context->assigned_var_ids;
|
|
$else_context->assigned_var_ids = [];
|
|
|
|
$pre_possibly_assigned_var_ids = $else_context->possibly_assigned_var_ids;
|
|
$else_context->possibly_assigned_var_ids = [];
|
|
|
|
if ($else) {
|
|
if ($statements_analyzer->analyze(
|
|
$else->stmts,
|
|
$else_context
|
|
) === false
|
|
) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/** @var array<string, bool> */
|
|
$new_assigned_var_ids = $else_context->assigned_var_ids;
|
|
$else_context->assigned_var_ids = $pre_stmts_assigned_var_ids;
|
|
|
|
/** @var array<string, bool> */
|
|
$new_possibly_assigned_var_ids = $else_context->possibly_assigned_var_ids;
|
|
$else_context->possibly_assigned_var_ids = $pre_possibly_assigned_var_ids + $new_possibly_assigned_var_ids;
|
|
|
|
if ($else && $else_context->byref_constraints !== null) {
|
|
foreach ($else_context->byref_constraints as $var_id => $byref_constraint) {
|
|
if ($outer_context->byref_constraints !== null
|
|
&& isset($outer_context->byref_constraints[$var_id])
|
|
&& ($outer_constraint_type = $outer_context->byref_constraints[$var_id]->type)
|
|
&& $byref_constraint->type
|
|
&& !TypeAnalyzer::isContainedBy(
|
|
$codebase,
|
|
$byref_constraint->type,
|
|
$outer_constraint_type
|
|
)
|
|
) {
|
|
if (IssueBuffer::accepts(
|
|
new ConflictingReferenceConstraint(
|
|
'There is more than one pass-by-reference constraint on ' . $var_id,
|
|
new CodeLocation($statements_analyzer, $else, $outer_context->include_location, true)
|
|
),
|
|
$statements_analyzer->getSuppressedIssues()
|
|
)) {
|
|
// fall through
|
|
}
|
|
} else {
|
|
$outer_context->byref_constraints[$var_id] = $byref_constraint;
|
|
}
|
|
}
|
|
}
|
|
|
|
if ($else && $outer_context->collect_references) {
|
|
$outer_context->referenced_var_ids = array_merge(
|
|
$outer_context->referenced_var_ids,
|
|
$else_context->referenced_var_ids
|
|
);
|
|
}
|
|
|
|
$final_actions = $else
|
|
? ScopeAnalyzer::getFinalControlActions(
|
|
$else->stmts,
|
|
$codebase->config->exit_functions,
|
|
$outer_context->inside_case
|
|
)
|
|
: [ScopeAnalyzer::ACTION_NONE];
|
|
// has a return/throw at end
|
|
$has_ending_statements = $final_actions === [ScopeAnalyzer::ACTION_END];
|
|
$has_leaving_statements = $has_ending_statements
|
|
|| (count($final_actions) && !in_array(ScopeAnalyzer::ACTION_NONE, $final_actions, true));
|
|
|
|
$has_break_statement = $final_actions === [ScopeAnalyzer::ACTION_BREAK];
|
|
$has_continue_statement = $final_actions === [ScopeAnalyzer::ACTION_CONTINUE];
|
|
$has_leave_switch_statement = $final_actions === [ScopeAnalyzer::ACTION_LEAVE_SWITCH];
|
|
|
|
$if_scope->final_actions = array_merge($final_actions, $if_scope->final_actions);
|
|
|
|
$else_redefined_vars = $else_context->getRedefinedVars($original_context->vars_in_scope);
|
|
|
|
// if it doesn't end in a return
|
|
if (!$has_leaving_statements) {
|
|
if ($if_scope->new_vars === null && $else) {
|
|
$if_scope->new_vars = array_diff_key($else_context->vars_in_scope, $outer_context->vars_in_scope);
|
|
} elseif ($if_scope->new_vars !== null) {
|
|
foreach ($if_scope->new_vars as $new_var => $type) {
|
|
if (!$else_context->hasVariable($new_var)) {
|
|
unset($if_scope->new_vars[$new_var]);
|
|
} else {
|
|
$if_scope->new_vars[$new_var] = Type::combineUnionTypes(
|
|
$type,
|
|
$else_context->vars_in_scope[$new_var]
|
|
);
|
|
}
|
|
}
|
|
}
|
|
|
|
if ($if_scope->assigned_var_ids === null) {
|
|
$if_scope->assigned_var_ids = $new_assigned_var_ids;
|
|
} else {
|
|
$if_scope->assigned_var_ids = array_intersect_key($new_assigned_var_ids, $if_scope->assigned_var_ids);
|
|
}
|
|
|
|
if ($if_scope->redefined_vars === null) {
|
|
$if_scope->redefined_vars = $else_redefined_vars;
|
|
$if_scope->possibly_redefined_vars = $if_scope->redefined_vars;
|
|
} else {
|
|
foreach ($if_scope->redefined_vars as $redefined_var => $type) {
|
|
if (!isset($else_redefined_vars[$redefined_var])) {
|
|
unset($if_scope->redefined_vars[$redefined_var]);
|
|
} else {
|
|
$if_scope->redefined_vars[$redefined_var] = Type::combineUnionTypes(
|
|
$else_redefined_vars[$redefined_var],
|
|
$type
|
|
);
|
|
}
|
|
}
|
|
|
|
foreach ($else_redefined_vars as $var => $type) {
|
|
if ($type->hasMixed()) {
|
|
$if_scope->possibly_redefined_vars[$var] = $type;
|
|
} elseif (isset($if_scope->possibly_redefined_vars[$var])) {
|
|
$if_scope->possibly_redefined_vars[$var] = Type::combineUnionTypes(
|
|
$type,
|
|
$if_scope->possibly_redefined_vars[$var]
|
|
);
|
|
} else {
|
|
$if_scope->possibly_redefined_vars[$var] = $type;
|
|
}
|
|
}
|
|
}
|
|
|
|
$if_scope->reasonable_clauses = [];
|
|
}
|
|
|
|
// update the parent context as necessary
|
|
if ($if_scope->negatable_if_types) {
|
|
$outer_context->update(
|
|
$old_else_context,
|
|
$else_context,
|
|
$has_leaving_statements,
|
|
array_keys($if_scope->negatable_if_types),
|
|
$if_scope->updated_vars
|
|
);
|
|
}
|
|
|
|
if (!$has_ending_statements) {
|
|
$vars_possibly_in_scope = array_diff_key(
|
|
$else_context->vars_possibly_in_scope,
|
|
$outer_context->vars_possibly_in_scope
|
|
);
|
|
|
|
$possibly_assigned_var_ids = $new_possibly_assigned_var_ids;
|
|
|
|
if ($has_leaving_statements && $else_context->loop_scope) {
|
|
if (!$has_continue_statement && !$has_break_statement) {
|
|
$if_scope->new_vars_possibly_in_scope = array_merge(
|
|
$vars_possibly_in_scope,
|
|
$if_scope->new_vars_possibly_in_scope
|
|
);
|
|
|
|
$if_scope->possibly_assigned_var_ids = array_merge(
|
|
$possibly_assigned_var_ids,
|
|
$if_scope->possibly_assigned_var_ids
|
|
);
|
|
}
|
|
|
|
$else_context->loop_scope->vars_possibly_in_scope = array_merge(
|
|
$vars_possibly_in_scope,
|
|
$else_context->loop_scope->vars_possibly_in_scope
|
|
);
|
|
} elseif (!$has_leaving_statements) {
|
|
$if_scope->new_vars_possibly_in_scope = array_merge(
|
|
$vars_possibly_in_scope,
|
|
$if_scope->new_vars_possibly_in_scope
|
|
);
|
|
|
|
$if_scope->possibly_assigned_var_ids = array_merge(
|
|
$possibly_assigned_var_ids,
|
|
$if_scope->possibly_assigned_var_ids
|
|
);
|
|
}
|
|
|
|
if ($outer_context->collect_references && (!$has_leaving_statements || $has_leave_switch_statement)) {
|
|
foreach ($else_context->unreferenced_vars as $var_id => $locations) {
|
|
if (!isset($outer_context->unreferenced_vars[$var_id])) {
|
|
if (isset($if_scope->new_unreferenced_vars[$var_id])) {
|
|
$if_scope->new_unreferenced_vars[$var_id] += $locations;
|
|
} else {
|
|
$if_scope->new_unreferenced_vars[$var_id] = $locations;
|
|
}
|
|
} else {
|
|
$new_locations = array_diff_key(
|
|
$locations,
|
|
$outer_context->unreferenced_vars[$var_id]
|
|
);
|
|
|
|
if ($new_locations) {
|
|
if (isset($if_scope->new_unreferenced_vars[$var_id])) {
|
|
$if_scope->new_unreferenced_vars[$var_id] += $locations;
|
|
} else {
|
|
$if_scope->new_unreferenced_vars[$var_id] = $locations;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if ($outer_context->collect_exceptions) {
|
|
$outer_context->possibly_thrown_exceptions += $else_context->possibly_thrown_exceptions;
|
|
}
|
|
|
|
if ($else_context->infer_types) {
|
|
$else_possible_param_types = $else_context->possible_param_types;
|
|
|
|
if ($if_scope->possible_param_types) {
|
|
$vars_to_remove = [];
|
|
|
|
foreach ($if_scope->possible_param_types as $var => $type) {
|
|
if (isset($else_possible_param_types[$var])) {
|
|
$if_scope->possible_param_types[$var] = Type::combineUnionTypes(
|
|
$else_possible_param_types[$var],
|
|
$type
|
|
);
|
|
} else {
|
|
$vars_to_remove[] = $var;
|
|
}
|
|
}
|
|
|
|
foreach ($vars_to_remove as $var) {
|
|
unset($if_scope->possible_param_types[$var]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns statements that are definitely evaluated before any statements after the end of the
|
|
* if/elseif/else blocks
|
|
*
|
|
* @param PhpParser\Node\Expr $stmt
|
|
* @param bool $inside_and
|
|
*
|
|
* @return PhpParser\Node\Expr|null
|
|
*/
|
|
protected static function getDefinitelyEvaluatedExpression(PhpParser\Node\Expr $stmt)
|
|
{
|
|
if ($stmt instanceof PhpParser\Node\Expr\BinaryOp) {
|
|
if ($stmt instanceof PhpParser\Node\Expr\BinaryOp\BooleanAnd
|
|
|| $stmt instanceof PhpParser\Node\Expr\BinaryOp\LogicalAnd
|
|
|| $stmt instanceof PhpParser\Node\Expr\BinaryOp\LogicalXor
|
|
) {
|
|
return self::getDefinitelyEvaluatedExpression($stmt->left);
|
|
}
|
|
|
|
return $stmt;
|
|
}
|
|
|
|
return $stmt;
|
|
}
|
|
}
|