mirror of
https://github.com/danog/psalm.git
synced 2024-12-04 10:38:49 +01:00
859 lines
27 KiB
PHP
859 lines
27 KiB
PHP
<?php
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declare(strict_types=1);
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namespace Psalm;
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use InvalidArgumentException;
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use Psalm\Internal\Analyzer\StatementsAnalyzer;
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use Psalm\Internal\Clause;
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use Psalm\Internal\ReferenceConstraint;
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use Psalm\Internal\Scope\CaseScope;
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use Psalm\Internal\Scope\FinallyScope;
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use Psalm\Internal\Scope\LoopScope;
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use Psalm\Internal\Type\AssertionReconciler;
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use Psalm\Storage\FunctionLikeStorage;
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use Psalm\Type\Atomic\DependentType;
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use Psalm\Type\Atomic\TIntRange;
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use Psalm\Type\Atomic\TNull;
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use Psalm\Type\Union;
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use RuntimeException;
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use function array_keys;
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use function array_search;
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use function array_shift;
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use function assert;
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use function count;
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use function in_array;
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use function is_int;
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use function json_encode;
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use function preg_match;
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use function preg_quote;
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use function preg_replace;
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use function str_contains;
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use function strpos;
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use function strtolower;
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use const JSON_THROW_ON_ERROR;
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final class Context
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{
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/**
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* @var array<string, Union>
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*/
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public array $vars_in_scope = [];
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/**
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* @var array<string, bool>
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*/
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public array $vars_possibly_in_scope = [];
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/**
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* Keeps track of how many times a var_in_scope has been referenced. May not be set for all $vars_in_scope.
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*
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* @var array<string, int<0, max>>
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*/
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public array $referenced_counts = [];
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/**
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* Maps references to referenced variables for the current scope.
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* With `$b = &$a`, this will contain `['$b' => '$a']`.
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*
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* All keys and values in this array are guaranteed to be set in $vars_in_scope.
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*
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* To check if a variable was passed or returned by reference, or
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* references an object property or array item, see Union::$by_ref.
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*
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* @var array<string, string>
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*/
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public array $references_in_scope = [];
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/**
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* Set of references to variables in another scope. These references will be marked as used if they are assigned to.
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*
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* @var array<string, true>
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*/
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public array $references_to_external_scope = [];
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/**
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* A set of globals that are referenced somewhere.
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*
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* @var array<string, true>
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*/
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public array $referenced_globals = [];
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/**
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* A set of references that might still be in scope from a scope likely to cause confusion. This applies
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* to references set inside a loop or if statement, since it's easy to forget about PHP's weird scope
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* rules, and assinging to a reference will change the referenced variable rather than shadowing it.
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*
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* @var array<string, CodeLocation>
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*/
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public array $references_possibly_from_confusing_scope = [];
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/**
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* Whether or not we're inside the conditional of an if/where etc.
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*
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* This changes whether or not the context is cloned
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*/
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public bool $inside_conditional = false;
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/**
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* Whether or not we're inside an isset call
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*
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* Inside issets Psalm is more lenient about certain things
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*/
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public bool $inside_isset = false;
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/**
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* Whether or not we're inside an unset call, where
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* we don't care about possibly undefined variables
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*/
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public bool $inside_unset = false;
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/**
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* Whether or not we're inside an class_exists call, where
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* we don't care about possibly undefined classes
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*/
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public bool $inside_class_exists = false;
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/**
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* Whether or not we're inside a function/method call
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*/
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public bool $inside_call = false;
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/**
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* Whether or not we're inside any other situation that treats a variable as used
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*/
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public bool $inside_general_use = false;
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/**
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* Whether or not we're inside a return expression
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*/
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public bool $inside_return = false;
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/**
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* Whether or not we're inside a throw
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*/
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public bool $inside_throw = false;
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/**
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* Whether or not we're inside an assignment
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*/
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public bool $inside_assignment = false;
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/**
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* Whether or not we're inside a try block.
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*/
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public bool $inside_try = false;
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public ?CodeLocation $include_location = null;
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public ?string $parent = null;
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public bool $check_classes = true;
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public bool $check_variables = true;
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public bool $check_methods = true;
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public bool $check_consts = true;
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public bool $check_functions = true;
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/**
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* A list of classes checked with class_exists
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*
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* @var array<lowercase-string,true>
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*/
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public array $phantom_classes = [];
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/**
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* A list of files checked with file_exists
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*
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* @var array<string,bool>
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*/
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public array $phantom_files = [];
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/**
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* A list of clauses in Conjunctive Normal Form
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*
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* @var list<Clause>
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*/
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public array $clauses = [];
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/**
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* A list of hashed clauses that have already been factored in
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*
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* @var list<string|int>
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*/
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public array $reconciled_expression_clauses = [];
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/**
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* Whether or not to do a deep analysis and collect mutations to this context
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*/
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public bool $collect_mutations = false;
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/**
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* Whether or not to do a deep analysis and collect initializations from private or final methods
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*/
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public bool $collect_initializations = false;
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/**
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* Whether or not to do a deep analysis and collect initializations from public non-final methods
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*/
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public bool $collect_nonprivate_initializations = false;
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/**
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* Stored to prevent re-analysing methods when checking for initialised properties
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*
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* @var array<string, bool>|null
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*/
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public ?array $initialized_methods = null;
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/**
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* @var array<string, Union>
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*/
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public array $constants = [];
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/**
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* Whether or not to track exceptions
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*/
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public bool $collect_exceptions = false;
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/**
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* A list of variables that have been referenced in conditionals
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*
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* @var array<string, bool>
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*/
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public array $cond_referenced_var_ids = [];
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/**
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* A list of variables that have been passed by reference (where we know their type)
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*
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* @var array<string, ReferenceConstraint>
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*/
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public array $byref_constraints = [];
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/**
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* A list of vars that have been assigned to
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*
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* @var array<string, int>
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*/
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public array $assigned_var_ids = [];
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/**
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* A list of vars that have been may have been assigned to
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*
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* @var array<string, bool>
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*/
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public array $possibly_assigned_var_ids = [];
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/**
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* A list of classes or interfaces that may have been thrown
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*
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* @var array<string, array<array-key, CodeLocation>>
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*/
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public array $possibly_thrown_exceptions = [];
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public bool $is_global = false;
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/**
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* @var array<string, bool>
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*/
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public array $protected_var_ids = [];
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/**
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* If we've branched from the main scope, a byte offset for where that branch happened
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*/
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public ?int $branch_point = null;
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/**
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* What does break mean in this context?
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*
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* 'loop' means we're breaking out of a loop,
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* 'switch' means we're breaking out of a switch
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*
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* @var list<'loop'|'switch'>
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*/
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public array $break_types = [];
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public bool $inside_loop = false;
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public ?LoopScope $loop_scope = null;
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public ?CaseScope $case_scope = null;
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public ?FinallyScope $finally_scope = null;
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public ?Context $if_body_context = null;
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public bool $strict_types = false;
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public ?string $calling_function_id = null;
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/**
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* @var lowercase-string|null
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*/
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public ?string $calling_method_id = null;
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public bool $inside_negation = false;
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public bool $ignore_variable_property = false;
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public bool $ignore_variable_method = false;
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public bool $pure = false;
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/**
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* @var bool
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* Set by @psalm-immutable
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*/
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public bool $mutation_free = false;
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/**
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* @var bool
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* Set by @psalm-external-mutation-free
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*/
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public bool $external_mutation_free = false;
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public bool $error_suppressing = false;
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public bool $has_returned = false;
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/**
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* @var array<string, true>
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*/
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public array $parent_remove_vars = [];
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/** @internal */
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public function __construct(
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/**
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* @var string|null
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* The name of the current class. Null if outside a class.
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*/
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public ?string $self = null,
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) {
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}
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public function __destruct()
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{
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$this->case_scope = null;
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}
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/**
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* Updates the parent context, looking at the changes within a block and then applying those changes, where
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* necessary, to the parent context
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*
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* @param bool $has_leaving_statements whether or not the parent scope is abandoned between
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* $start_context and $end_context
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* @param array<string, bool> $updated_vars
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*/
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public function update(
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Context $start_context,
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Context $end_context,
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bool $has_leaving_statements,
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array $vars_to_update,
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array &$updated_vars,
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): void {
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foreach ($start_context->vars_in_scope as $var_id => $old_type) {
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// this is only true if there was some sort of type negation
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if (in_array($var_id, $vars_to_update, true)) {
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// if we're leaving, we're effectively deleting the possibility of the if types
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$new_type = !$has_leaving_statements && $end_context->hasVariable($var_id)
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? $end_context->vars_in_scope[$var_id]
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: null;
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$existing_type = $this->vars_in_scope[$var_id] ?? null;
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if (!$existing_type) {
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if ($new_type) {
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$this->vars_in_scope[$var_id] = $new_type;
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$updated_vars[$var_id] = true;
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}
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continue;
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}
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// if the type changed within the block of statements, process the replacement
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// also never allow ourselves to remove all types from a union
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if ((!$new_type || !$old_type->equals($new_type))
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&& ($new_type || count($existing_type->getAtomicTypes()) > 1)
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) {
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$existing_type = $existing_type
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->getBuilder()
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->substitute($old_type, $new_type);
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if ($new_type && $new_type->from_docblock) {
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$existing_type = $existing_type->setFromDocblock();
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}
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$existing_type = $existing_type->freeze();
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$updated_vars[$var_id] = true;
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}
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$this->vars_in_scope[$var_id] = $existing_type;
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}
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}
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}
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/**
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* Updates the list of possible references from a confusing scope,
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* such as a reference created in an if that might later be reused.
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*/
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public function updateReferencesPossiblyFromConfusingScope(
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Context $confusing_scope_context,
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StatementsAnalyzer $statements_analyzer,
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): void {
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$references = $confusing_scope_context->references_in_scope
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+ $confusing_scope_context->references_to_external_scope;
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foreach ($references as $reference_id => $_) {
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if (!isset($this->references_in_scope[$reference_id])
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&& !isset($this->references_to_external_scope[$reference_id])
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&& $reference_location = $statements_analyzer->getFirstAppearance($reference_id)
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) {
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$this->references_possibly_from_confusing_scope[$reference_id] = $reference_location;
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}
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}
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$this->references_possibly_from_confusing_scope +=
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$confusing_scope_context->references_possibly_from_confusing_scope;
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}
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/**
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* @param array<string, Union> $new_vars_in_scope
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* @return array<string, Union>
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*/
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public function getRedefinedVars(array $new_vars_in_scope, bool $include_new_vars = false): array
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{
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$redefined_vars = [];
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foreach ($this->vars_in_scope as $var_id => $this_type) {
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if (!isset($new_vars_in_scope[$var_id])) {
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if ($include_new_vars) {
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$redefined_vars[$var_id] = $this_type;
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}
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continue;
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}
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$new_type = $new_vars_in_scope[$var_id];
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if (!$this_type->equals(
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$new_type,
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true,
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!($this_type->propagate_parent_nodes || $new_type->propagate_parent_nodes),
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)
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) {
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$redefined_vars[$var_id] = $this_type;
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}
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}
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return $redefined_vars;
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}
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/**
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* @return list<string>
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*/
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public static function getNewOrUpdatedVarIds(Context $original_context, Context $new_context): array
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{
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$redefined_var_ids = [];
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foreach ($new_context->vars_in_scope as $var_id => $context_type) {
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if (!isset($original_context->vars_in_scope[$var_id])
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|| ($original_context->assigned_var_ids[$var_id] ?? 0)
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!== ($new_context->assigned_var_ids[$var_id] ?? 0)
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|| !$original_context->vars_in_scope[$var_id]->equals($context_type)
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) {
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$redefined_var_ids[] = $var_id;
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}
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}
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return $redefined_var_ids;
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}
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public function remove(string $remove_var_id, bool $removeDescendents = true): void
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{
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if (isset($this->vars_in_scope[$remove_var_id])) {
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$existing_type = $this->vars_in_scope[$remove_var_id];
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unset($this->vars_in_scope[$remove_var_id]);
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if ($removeDescendents) {
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$this->removeDescendents($remove_var_id, $existing_type);
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}
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}
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$this->removePossibleReference($remove_var_id);
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unset($this->vars_possibly_in_scope[$remove_var_id]);
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}
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/**
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* Remove a variable from the context which might be a reference to another variable, or
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* referenced by another variable. Leaves the variable as possibly-in-scope, unlike remove().
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*/
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public function removePossibleReference(string $remove_var_id): void
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{
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if (isset($this->referenced_counts[$remove_var_id]) && $this->referenced_counts[$remove_var_id] > 0) {
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// If a referenced variable goes out of scope, we need to update the references.
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// All of the references to this variable are still references to the same value,
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// so we pick the first one and make the rest of the references point to it.
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$references = [];
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foreach ($this->references_in_scope as $reference => $referenced) {
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if ($referenced === $remove_var_id) {
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$references[] = $reference;
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unset($this->references_in_scope[$reference]);
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}
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}
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assert(!empty($references));
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$first_reference = array_shift($references);
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if (!empty($references)) {
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$this->referenced_counts[$first_reference] = count($references);
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foreach ($references as $reference) {
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$this->references_in_scope[$reference] = $first_reference;
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}
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}
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}
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if (isset($this->references_in_scope[$remove_var_id])) {
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$this->decrementReferenceCount($remove_var_id);
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}
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unset(
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$this->vars_in_scope[$remove_var_id],
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$this->cond_referenced_var_ids[$remove_var_id],
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$this->referenced_counts[$remove_var_id],
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$this->references_in_scope[$remove_var_id],
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$this->references_to_external_scope[$remove_var_id],
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);
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}
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/**
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* Decrement the reference count of the variable that $ref_id is referring to. This needs to
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* be done before $ref_id is changed to no longer reference its currently referenced variable,
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* for example by unsetting, reassigning to another reference, or being shadowed by a global.
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*/
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public function decrementReferenceCount(string $ref_id): void
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{
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if (!isset($this->referenced_counts[$this->references_in_scope[$ref_id]])) {
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throw new InvalidArgumentException("$ref_id is not a reference");
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}
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$reference_count = $this->referenced_counts[$this->references_in_scope[$ref_id]];
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if ($reference_count < 1) {
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throw new RuntimeException("Incorrect referenced count found");
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}
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--$reference_count;
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$this->referenced_counts[$this->references_in_scope[$ref_id]] = $reference_count;
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}
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/**
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* @param Clause[] $clauses
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* @param array<string, bool> $changed_var_ids
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* @return array{list<Clause>, list<Clause>}
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* @psalm-pure
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*/
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public static function removeReconciledClauses(array $clauses, array $changed_var_ids): array
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{
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$included_clauses = [];
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$rejected_clauses = [];
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foreach ($clauses as $c) {
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if ($c->wedge) {
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$included_clauses[] = $c;
|
|
continue;
|
|
}
|
|
|
|
foreach ($c->possibilities as $key => $_) {
|
|
if (isset($changed_var_ids[$key])) {
|
|
$rejected_clauses[] = $c;
|
|
continue 2;
|
|
}
|
|
}
|
|
|
|
$included_clauses[] = $c;
|
|
}
|
|
|
|
return [$included_clauses, $rejected_clauses];
|
|
}
|
|
|
|
/**
|
|
* @param Clause[] $clauses
|
|
* @return list<Clause>
|
|
*/
|
|
public static function filterClauses(
|
|
string $remove_var_id,
|
|
array $clauses,
|
|
?Union $new_type = null,
|
|
?StatementsAnalyzer $statements_analyzer = null,
|
|
): array {
|
|
$new_type_string = $new_type ? $new_type->getId() : '';
|
|
$clauses_to_keep = [];
|
|
|
|
foreach ($clauses as $clause) {
|
|
$clause = $clause->calculateNegation();
|
|
|
|
$quoted_remove_var_id = preg_quote($remove_var_id, '/');
|
|
|
|
foreach ($clause->possibilities as $var_id => $_) {
|
|
if (preg_match('/' . $quoted_remove_var_id . '[\]\[\-]/', $var_id)) {
|
|
break 2;
|
|
}
|
|
}
|
|
|
|
if (!isset($clause->possibilities[$remove_var_id])
|
|
|| (count($clause->possibilities[$remove_var_id]) === 1
|
|
&& array_keys($clause->possibilities[$remove_var_id])[0] === $new_type_string)
|
|
) {
|
|
$clauses_to_keep[] = $clause;
|
|
} elseif ($statements_analyzer &&
|
|
$new_type &&
|
|
!$new_type->hasMixed()
|
|
) {
|
|
$type_changed = false;
|
|
|
|
// if the clause contains any possibilities that would be altered
|
|
// by the new type
|
|
foreach ($clause->possibilities[$remove_var_id] as $assertion) {
|
|
// if we're negating a type, we generally don't need the clause anymore
|
|
if ($assertion->isNegation()) {
|
|
$type_changed = true;
|
|
break;
|
|
}
|
|
|
|
$result_type = AssertionReconciler::reconcile(
|
|
$assertion,
|
|
$new_type,
|
|
null,
|
|
$statements_analyzer,
|
|
false,
|
|
[],
|
|
null,
|
|
[],
|
|
$failed_reconciliation,
|
|
);
|
|
|
|
if ($result_type->getId() !== $new_type_string) {
|
|
$type_changed = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!$type_changed) {
|
|
$clauses_to_keep[] = $clause;
|
|
}
|
|
}
|
|
}
|
|
|
|
return $clauses_to_keep;
|
|
}
|
|
|
|
public function removeVarFromConflictingClauses(
|
|
string $remove_var_id,
|
|
?Union $new_type = null,
|
|
?StatementsAnalyzer $statements_analyzer = null,
|
|
): void {
|
|
$this->clauses = self::filterClauses($remove_var_id, $this->clauses, $new_type, $statements_analyzer);
|
|
$this->parent_remove_vars[$remove_var_id] = true;
|
|
}
|
|
|
|
/**
|
|
* This method is used after assignments to variables to remove any existing
|
|
* items in $vars_in_scope that are now made redundant by an update to some data
|
|
*/
|
|
public function removeDescendents(
|
|
string $remove_var_id,
|
|
Union $existing_type,
|
|
?Union $new_type = null,
|
|
?StatementsAnalyzer $statements_analyzer = null,
|
|
): void {
|
|
$this->removeVarFromConflictingClauses(
|
|
$remove_var_id,
|
|
$existing_type->hasMixed()
|
|
|| ($new_type && $existing_type->from_docblock !== $new_type->from_docblock)
|
|
? null
|
|
: $new_type,
|
|
$statements_analyzer,
|
|
);
|
|
|
|
foreach ($this->vars_in_scope as $var_id => &$type) {
|
|
if (preg_match('/' . preg_quote($remove_var_id, '/') . '[\]\[\-]/', $var_id)) {
|
|
$this->remove($var_id, false);
|
|
}
|
|
|
|
$builder = null;
|
|
foreach ($type->getAtomicTypes() as $atomic_type) {
|
|
if ($atomic_type instanceof DependentType
|
|
&& $atomic_type->getVarId() === $remove_var_id
|
|
) {
|
|
$builder ??= $type->getBuilder();
|
|
$builder->addType($atomic_type->getReplacement());
|
|
}
|
|
}
|
|
if ($builder) {
|
|
$type = $builder->freeze();
|
|
}
|
|
}
|
|
}
|
|
|
|
public function removeMutableObjectVars(bool $methods_only = false): void
|
|
{
|
|
$vars_to_remove = [];
|
|
|
|
foreach ($this->vars_in_scope as $var_id => $type) {
|
|
if ($type->has_mutations
|
|
&& (str_contains($var_id, '->') || str_contains($var_id, '::'))
|
|
&& (!$methods_only || strpos($var_id, '()'))
|
|
) {
|
|
$vars_to_remove[] = $var_id;
|
|
}
|
|
}
|
|
|
|
if (!$vars_to_remove) {
|
|
return;
|
|
}
|
|
|
|
foreach ($vars_to_remove as $var_id) {
|
|
$this->remove($var_id, false);
|
|
}
|
|
|
|
$clauses_to_keep = [];
|
|
|
|
foreach ($this->clauses as $clause) {
|
|
$abandon_clause = false;
|
|
|
|
foreach (array_keys($clause->possibilities) as $key) {
|
|
if ((str_contains($key, '->') || str_contains($key, '::'))
|
|
&& (!$methods_only || strpos($key, '()'))
|
|
) {
|
|
$abandon_clause = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!$abandon_clause) {
|
|
$clauses_to_keep[] = $clause;
|
|
}
|
|
}
|
|
|
|
$this->clauses = $clauses_to_keep;
|
|
}
|
|
|
|
public function updateChecks(Context $op_context): void
|
|
{
|
|
$this->check_classes = $this->check_classes && $op_context->check_classes;
|
|
$this->check_variables = $this->check_variables && $op_context->check_variables;
|
|
$this->check_methods = $this->check_methods && $op_context->check_methods;
|
|
$this->check_functions = $this->check_functions && $op_context->check_functions;
|
|
$this->check_consts = $this->check_consts && $op_context->check_consts;
|
|
}
|
|
|
|
public function isPhantomClass(string $class_name): bool
|
|
{
|
|
return isset($this->phantom_classes[strtolower($class_name)]);
|
|
}
|
|
|
|
public function hasVariable(string $var_name): bool
|
|
{
|
|
if (!$var_name) {
|
|
return false;
|
|
}
|
|
|
|
$stripped_var = (string) preg_replace('/(->|\[).*$/', '', $var_name, 1);
|
|
|
|
if ($stripped_var !== '$this' || $var_name !== $stripped_var) {
|
|
$this->cond_referenced_var_ids[$var_name] = true;
|
|
}
|
|
|
|
return isset($this->vars_in_scope[$var_name]);
|
|
}
|
|
|
|
public function getScopeSummary(): string
|
|
{
|
|
$summary = [];
|
|
foreach ($this->vars_possibly_in_scope as $k => $_) {
|
|
$summary[$k] = true;
|
|
}
|
|
foreach ($this->vars_in_scope as $k => $v) {
|
|
$summary[$k] = $v->getId();
|
|
}
|
|
|
|
return json_encode($summary, JSON_THROW_ON_ERROR);
|
|
}
|
|
|
|
public function defineGlobals(): void
|
|
{
|
|
$globals = [
|
|
// not sure why this is declared here again, see VariableFetchAnalyzer
|
|
'$argv' => new Union([
|
|
Type::getNonEmptyListAtomic(Type::getString()),
|
|
new TNull(),
|
|
], [
|
|
'ignore_nullable_issues' => true,
|
|
]),
|
|
'$argc' => new Union([
|
|
new TIntRange(1, null),
|
|
new TNull(),
|
|
], [
|
|
'ignore_nullable_issues' => true,
|
|
]),
|
|
];
|
|
|
|
$config = Config::getInstance();
|
|
|
|
foreach ($config->globals as $global_id => $type_string) {
|
|
$globals[$global_id] = Type::parseString($type_string);
|
|
}
|
|
|
|
foreach ($globals as $global_id => $type) {
|
|
$this->vars_in_scope[$global_id] = $type;
|
|
$this->vars_possibly_in_scope[$global_id] = true;
|
|
}
|
|
}
|
|
|
|
public function mergeExceptions(Context $other_context): void
|
|
{
|
|
foreach ($other_context->possibly_thrown_exceptions as $possibly_thrown_exception => $codelocations) {
|
|
foreach ($codelocations as $hash => $codelocation) {
|
|
$this->possibly_thrown_exceptions[$possibly_thrown_exception][$hash] = $codelocation;
|
|
}
|
|
}
|
|
}
|
|
|
|
public function isSuppressingExceptions(StatementsAnalyzer $statements_analyzer): bool
|
|
{
|
|
if (!$this->collect_exceptions) {
|
|
return true;
|
|
}
|
|
|
|
$issue_type = $this->is_global ? 'UncaughtThrowInGlobalScope' : 'MissingThrowsDocblock';
|
|
$suppressed_issues = $statements_analyzer->getSuppressedIssues();
|
|
$suppressed_issue_position = array_search($issue_type, $suppressed_issues, true);
|
|
if ($suppressed_issue_position !== false) {
|
|
if (is_int($suppressed_issue_position)) {
|
|
$file = $statements_analyzer->getFileAnalyzer()->getFilePath();
|
|
IssueBuffer::addUsedSuppressions([
|
|
$file => [$suppressed_issue_position => true],
|
|
]);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
public function mergeFunctionExceptions(
|
|
FunctionLikeStorage $function_storage,
|
|
CodeLocation $codelocation,
|
|
): void {
|
|
$hash = $codelocation->getHash();
|
|
foreach ($function_storage->throws as $possibly_thrown_exception => $_) {
|
|
$this->possibly_thrown_exceptions[$possibly_thrown_exception][$hash] = $codelocation;
|
|
}
|
|
}
|
|
|
|
public function insideUse(): bool
|
|
{
|
|
return $this->inside_assignment
|
|
|| $this->inside_return
|
|
|| $this->inside_call
|
|
|| $this->inside_general_use
|
|
|| $this->inside_conditional
|
|
|| $this->inside_throw
|
|
|| $this->inside_isset;
|
|
}
|
|
}
|