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AssignmentAnalyzer.php
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AssignmentAnalyzer.php
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<?php
namespace Psalm\Internal\Analyzer\Statements\Expression;
use PhpParser;
use PhpParser\Node\Expr\ArrayDimFetch;
use PhpParser\Node\Expr\PropertyFetch;
use PhpParser\Node\Expr\Variable;
use Psalm\CodeLocation;
use Psalm\CodeLocation\DocblockTypeLocation;
use Psalm\Codebase;
use Psalm\Context;
use Psalm\Exception\DocblockParseException;
use Psalm\Exception\IncorrectDocblockException;
use Psalm\Internal\Algebra;
use Psalm\Internal\Algebra\FormulaGenerator;
use Psalm\Internal\Analyzer\CommentAnalyzer;
use Psalm\Internal\Analyzer\FunctionLikeAnalyzer;
use Psalm\Internal\Analyzer\Statements\Block\ForeachAnalyzer;
use Psalm\Internal\Analyzer\Statements\Expression\Assignment\ArrayAssignmentAnalyzer;
use Psalm\Internal\Analyzer\Statements\Expression\Assignment\InstancePropertyAssignmentAnalyzer;
use Psalm\Internal\Analyzer\Statements\Expression\Assignment\StaticPropertyAssignmentAnalyzer;
use Psalm\Internal\Analyzer\Statements\Expression\Fetch\ArrayFetchAnalyzer;
use Psalm\Internal\Analyzer\Statements\Expression\Fetch\VariableFetchAnalyzer;
use Psalm\Internal\Analyzer\Statements\ExpressionAnalyzer;
use Psalm\Internal\Analyzer\StatementsAnalyzer;
use Psalm\Internal\Analyzer\TraitAnalyzer;
use Psalm\Internal\Clause;
use Psalm\Internal\Codebase\DataFlowGraph;
use Psalm\Internal\Codebase\TaintFlowGraph;
use Psalm\Internal\Codebase\VariableUseGraph;
use Psalm\Internal\DataFlow\DataFlowNode;
use Psalm\Internal\FileManipulation\FileManipulationBuffer;
use Psalm\Internal\ReferenceConstraint;
use Psalm\Internal\Scanner\VarDocblockComment;
use Psalm\Internal\Type\Comparator\UnionTypeComparator;
use Psalm\Internal\Type\TypeExpander;
use Psalm\Issue\AssignmentToVoid;
use Psalm\Issue\ImpureByReferenceAssignment;
use Psalm\Issue\ImpurePropertyAssignment;
use Psalm\Issue\InvalidArrayAccess;
use Psalm\Issue\InvalidArrayOffset;
use Psalm\Issue\InvalidDocblock;
use Psalm\Issue\InvalidScope;
use Psalm\Issue\LoopInvalidation;
use Psalm\Issue\MissingDocblockType;
use Psalm\Issue\MixedArrayAccess;
use Psalm\Issue\MixedAssignment;
use Psalm\Issue\NoValue;
use Psalm\Issue\NullReference;
use Psalm\Issue\PossiblyInvalidArrayAccess;
use Psalm\Issue\PossiblyNullArrayAccess;
use Psalm\Issue\PossiblyUndefinedArrayOffset;
use Psalm\Issue\ReferenceConstraintViolation;
use Psalm\Issue\ReferenceReusedFromConfusingScope;
use Psalm\Issue\UnnecessaryVarAnnotation;
use Psalm\IssueBuffer;
use Psalm\Node\Expr\BinaryOp\VirtualBitwiseAnd;
use Psalm\Node\Expr\BinaryOp\VirtualBitwiseOr;
use Psalm\Node\Expr\BinaryOp\VirtualBitwiseXor;
use Psalm\Node\Expr\BinaryOp\VirtualCoalesce;
use Psalm\Node\Expr\BinaryOp\VirtualConcat;
use Psalm\Node\Expr\BinaryOp\VirtualDiv;
use Psalm\Node\Expr\BinaryOp\VirtualMinus;
use Psalm\Node\Expr\BinaryOp\VirtualMod;
use Psalm\Node\Expr\BinaryOp\VirtualMul;
use Psalm\Node\Expr\BinaryOp\VirtualPlus;
use Psalm\Node\Expr\BinaryOp\VirtualPow;
use Psalm\Node\Expr\BinaryOp\VirtualShiftLeft;
use Psalm\Node\Expr\BinaryOp\VirtualShiftRight;
use Psalm\Node\Expr\VirtualAssign;
use Psalm\Plugin\EventHandler\Event\AddRemoveTaintsEvent;
use Psalm\Storage\Assertion\Falsy;
use Psalm\Type;
use Psalm\Type\Atomic\TArray;
use Psalm\Type\Atomic\TFalse;
use Psalm\Type\Atomic\TKeyedArray;
use Psalm\Type\Atomic\TList;
use Psalm\Type\Atomic\TMixed;
use Psalm\Type\Atomic\TNamedObject;
use Psalm\Type\Atomic\TNonEmptyArray;
use Psalm\Type\Atomic\TNonEmptyList;
use Psalm\Type\Atomic\TNull;
use Psalm\Type\Union;
use RuntimeException;
use UnexpectedValueException;
use function array_filter;
use function array_merge;
use function count;
use function in_array;
use function is_string;
use function reset;
use function spl_object_id;
use function strpos;
use function strtolower;
/**
* @internal
*/
class AssignmentAnalyzer
{
/**
* @param PhpParser\Node\Expr|null $assign_value This has to be null to support list destructuring
*
* @return false|Union
*/
public static function analyze(
StatementsAnalyzer $statements_analyzer,
PhpParser\Node\Expr $assign_var,
?PhpParser\Node\Expr $assign_value,
?Union $assign_value_type,
Context $context,
?PhpParser\Comment\Doc $doc_comment,
array $not_ignored_docblock_var_ids = [],
?PhpParser\Node\Expr $assign_expr = null
) {
$var_id = ExpressionIdentifier::getVarId(
$assign_var,
$statements_analyzer->getFQCLN(),
$statements_analyzer
);
// gets a variable id that *may* contain array keys
$extended_var_id = ExpressionIdentifier::getExtendedVarId(
$assign_var,
$statements_analyzer->getFQCLN(),
$statements_analyzer
);
$var_comments = [];
$comment_type = null;
$comment_type_location = null;
$was_in_assignment = $context->inside_assignment;
$context->inside_assignment = true;
$codebase = $statements_analyzer->getCodebase();
$base_assign_value = $assign_value;
while ($base_assign_value instanceof PhpParser\Node\Expr\Assign) {
$base_assign_value = $base_assign_value->expr;
}
if ($base_assign_value !== $assign_value) {
ExpressionAnalyzer::analyze($statements_analyzer, $base_assign_value, $context);
$assign_value_type = $statements_analyzer->node_data->getType($base_assign_value) ?? $assign_value_type;
}
$removed_taints = [];
if ($doc_comment) {
$file_path = $statements_analyzer->getRootFilePath();
$file_storage_provider = $codebase->file_storage_provider;
$file_storage = $file_storage_provider->get($file_path);
$template_type_map = $statements_analyzer->getTemplateTypeMap();
try {
$var_comments = $codebase->config->disable_var_parsing
? []
: CommentAnalyzer::getTypeFromComment(
$doc_comment,
$statements_analyzer->getSource(),
$statements_analyzer->getAliases(),
$template_type_map,
$file_storage->type_aliases
);
} catch (IncorrectDocblockException $e) {
IssueBuffer::maybeAdd(
new MissingDocblockType(
$e->getMessage(),
new CodeLocation($statements_analyzer->getSource(), $assign_var)
)
);
} catch (DocblockParseException $e) {
IssueBuffer::maybeAdd(
new InvalidDocblock(
$e->getMessage(),
new CodeLocation($statements_analyzer->getSource(), $assign_var)
)
);
}
foreach ($var_comments as $var_comment) {
if ($var_comment->removed_taints) {
$removed_taints = $var_comment->removed_taints;
}
self::assignTypeFromVarDocblock(
$statements_analyzer,
$assign_var,
$var_comment,
$context,
$var_id,
$comment_type,
$comment_type_location,
$not_ignored_docblock_var_ids
);
if ($var_id === $var_comment->var_id && $assign_value_type && $comment_type) {
$comment_type->by_ref = $assign_value_type->by_ref;
}
}
}
if ($extended_var_id) {
unset($context->referenced_var_ids[$extended_var_id]);
$context->assigned_var_ids[$extended_var_id] = (int) $assign_var->getAttribute('startFilePos');
$context->possibly_assigned_var_ids[$extended_var_id] = true;
}
if ($assign_value) {
if ($var_id && $assign_value instanceof PhpParser\Node\Expr\Closure) {
foreach ($assign_value->uses as $closure_use) {
if ($closure_use->byRef
&& is_string($closure_use->var->name)
&& $var_id === '$' . $closure_use->var->name
) {
$context->vars_in_scope[$var_id] = Type::getClosure();
$context->vars_possibly_in_scope[$var_id] = true;
}
}
}
$was_inside_general_use = $context->inside_general_use;
$root_expr = $assign_var;
while ($root_expr instanceof PhpParser\Node\Expr\ArrayDimFetch) {
$root_expr = $root_expr->var;
}
// if we don't know where this data is going, treat as a dead-end usage
if (!$root_expr instanceof PhpParser\Node\Expr\Variable
|| (is_string($root_expr->name)
&& in_array('$' . $root_expr->name, VariableFetchAnalyzer::SUPER_GLOBALS, true))
) {
$context->inside_general_use = true;
}
if (ExpressionAnalyzer::analyze($statements_analyzer, $assign_value, $context) === false) {
$context->inside_general_use = $was_inside_general_use;
if ($var_id) {
if ($extended_var_id && isset($context->vars_in_scope[$extended_var_id])) {
$context->removeDescendents(
$extended_var_id,
$context->vars_in_scope[$extended_var_id],
$assign_value_type
);
}
// if we're not exiting immediately, make everything mixed
$context->vars_in_scope[$var_id] = $comment_type ?? Type::getMixed();
}
return false;
}
$context->inside_general_use = $was_inside_general_use;
}
if ($comment_type && $comment_type_location) {
$temp_assign_value_type = $assign_value_type
?? ($assign_value ? $statements_analyzer->node_data->getType($assign_value) : null);
if ($codebase->find_unused_variables
&& $temp_assign_value_type
&& $extended_var_id
&& (!$not_ignored_docblock_var_ids || isset($not_ignored_docblock_var_ids[$extended_var_id]))
&& $temp_assign_value_type->getId() === $comment_type->getId()
&& !$comment_type->isMixed()
) {
if ($codebase->alter_code
&& isset($statements_analyzer->getProjectAnalyzer()->getIssuesToFix()['UnnecessaryVarAnnotation'])
) {
FileManipulationBuffer::addVarAnnotationToRemove($comment_type_location);
} elseif (IssueBuffer::accepts(
new UnnecessaryVarAnnotation(
'The @var ' . $comment_type . ' annotation for '
. $extended_var_id . ' is unnecessary',
$comment_type_location
),
$statements_analyzer->getSuppressedIssues(),
true
)) {
// fall through
}
}
$parent_nodes = $temp_assign_value_type->parent_nodes ?? [];
$assign_value_type = $comment_type;
$assign_value_type->parent_nodes = $parent_nodes;
} elseif (!$assign_value_type) {
if ($assign_value) {
$assign_value_type = $statements_analyzer->node_data->getType($assign_value);
}
if ($assign_value_type) {
$assign_value_type = clone $assign_value_type;
$assign_value_type->from_property = false;
$assign_value_type->from_static_property = false;
$assign_value_type->ignore_isset = false;
} else {
$assign_value_type = Type::getMixed();
}
}
if ($statements_analyzer->data_flow_graph instanceof VariableUseGraph
&& !$assign_value_type->parent_nodes
) {
if ($extended_var_id) {
$assignment_node = DataFlowNode::getForAssignment(
$extended_var_id,
new CodeLocation($statements_analyzer->getSource(), $assign_var)
);
} else {
$assignment_node = new DataFlowNode('unknown-origin', 'unknown origin', null);
}
$assign_value_type->parent_nodes = [
$assignment_node->id => $assignment_node
];
if ($context->inside_try) {
// Copy previous assignment's parent nodes inside a try. Since an exception could be thrown at any
// point this is a workaround to ensure that use of a variable also uses all previous assignments.
if (isset($context->vars_in_scope[$extended_var_id])) {
$assign_value_type->parent_nodes += $context->vars_in_scope[$extended_var_id]->parent_nodes;
}
}
}
if ($extended_var_id && isset($context->vars_in_scope[$extended_var_id])) {
if ($context->vars_in_scope[$extended_var_id]->by_ref) {
if ($context->mutation_free) {
IssueBuffer::maybeAdd(
new ImpureByReferenceAssignment(
'Variable ' . $extended_var_id . ' cannot be assigned to as it is passed by reference',
new CodeLocation($statements_analyzer->getSource(), $assign_var)
)
);
} elseif ($statements_analyzer->getSource() instanceof FunctionLikeAnalyzer
&& $statements_analyzer->getSource()->track_mutations
) {
$statements_analyzer->getSource()->inferred_impure = true;
$statements_analyzer->getSource()->inferred_has_mutation = true;
}
$assign_value_type->by_ref = true;
}
// removes dependent vars from $context
$context->removeDescendents(
$extended_var_id,
$context->vars_in_scope[$extended_var_id],
$assign_value_type,
$statements_analyzer
);
} else {
$root_var_id = ExpressionIdentifier::getRootVarId(
$assign_var,
$statements_analyzer->getFQCLN(),
$statements_analyzer
);
if ($root_var_id && isset($context->vars_in_scope[$root_var_id])) {
$context->removeVarFromConflictingClauses(
$root_var_id,
$context->vars_in_scope[$root_var_id],
$statements_analyzer
);
}
}
$codebase = $statements_analyzer->getCodebase();
if ($assign_value_type->hasMixed()) {
$root_var_id = ExpressionIdentifier::getRootVarId(
$assign_var,
$statements_analyzer->getFQCLN(),
$statements_analyzer
);
if (!$context->collect_initializations
&& !$context->collect_mutations
&& $statements_analyzer->getFilePath() === $statements_analyzer->getRootFilePath()
&& (!(($parent_source = $statements_analyzer->getSource())
instanceof FunctionLikeAnalyzer)
|| !$parent_source->getSource() instanceof TraitAnalyzer)
) {
$codebase->analyzer->incrementMixedCount($statements_analyzer->getFilePath());
}
if (!$assign_var instanceof PhpParser\Node\Expr\PropertyFetch
&& !strpos($root_var_id ?? '', '->')
&& !$comment_type
&& strpos($var_id ?? '', '$_') !== 0
) {
$origin_locations = [];
if ($statements_analyzer->data_flow_graph instanceof VariableUseGraph) {
foreach ($assign_value_type->parent_nodes as $parent_node) {
$origin_locations = array_merge(
$origin_locations,
$statements_analyzer->data_flow_graph->getOriginLocations($parent_node)
);
}
}
$origin_location = count($origin_locations) === 1 ? reset($origin_locations) : null;
$message = $var_id
? 'Unable to determine the type that ' . $var_id . ' is being assigned to'
: 'Unable to determine the type of this assignment';
$issue_location = new CodeLocation($statements_analyzer->getSource(), $assign_var);
if ($origin_location && $origin_location->getHash() === $issue_location->getHash()) {
$origin_location = null;
}
IssueBuffer::maybeAdd(
new MixedAssignment(
$message,
$issue_location,
$origin_location
),
$statements_analyzer->getSuppressedIssues()
);
}
} else {
if (!$context->collect_initializations
&& !$context->collect_mutations
&& $statements_analyzer->getFilePath() === $statements_analyzer->getRootFilePath()
&& (!(($parent_source = $statements_analyzer->getSource())
instanceof FunctionLikeAnalyzer)
|| !$parent_source->getSource() instanceof TraitAnalyzer)
) {
$codebase->analyzer->incrementNonMixedCount($statements_analyzer->getFilePath());
}
if ($var_id
&& isset($context->byref_constraints[$var_id])
&& ($outer_constraint_type = $context->byref_constraints[$var_id]->type)
) {
if (!UnionTypeComparator::isContainedBy(
$codebase,
$assign_value_type,
$outer_constraint_type,
$assign_value_type->ignore_nullable_issues,
$assign_value_type->ignore_falsable_issues
)
) {
IssueBuffer::maybeAdd(
new ReferenceConstraintViolation(
'Variable ' . $var_id . ' is limited to values of type '
. $context->byref_constraints[$var_id]->type
. ' because it is passed by reference, '
. $assign_value_type->getId() . ' type found',
new CodeLocation($statements_analyzer->getSource(), $assign_var)
),
$statements_analyzer->getSuppressedIssues()
);
}
}
}
if ($var_id === '$this' && IssueBuffer::accepts(
new InvalidScope(
'Cannot re-assign ' . $var_id,
new CodeLocation($statements_analyzer->getSource(), $assign_var)
),
$statements_analyzer->getSuppressedIssues()
)) {
return false;
}
if (isset($context->protected_var_ids[$var_id])
&& $assign_value_type->hasLiteralInt()
) {
IssueBuffer::maybeAdd(
new LoopInvalidation(
'Variable ' . $var_id . ' has already been assigned in a for/foreach loop',
new CodeLocation($statements_analyzer->getSource(), $assign_var)
),
$statements_analyzer->getSuppressedIssues()
);
}
if ($assign_var instanceof PhpParser\Node\Expr\Variable) {
self::analyzeAssignmentToVariable(
$statements_analyzer,
$codebase,
$assign_var,
$assign_value,
$assign_value_type,
$var_id,
$context
);
} elseif ($assign_var instanceof PhpParser\Node\Expr\List_
|| $assign_var instanceof PhpParser\Node\Expr\Array_
) {
self::analyzeDestructuringAssignment(
$statements_analyzer,
$codebase,
$assign_var,
$assign_value,
$assign_value_type,
$context,
$doc_comment,
$extended_var_id,
$var_comments,
$removed_taints
);
} elseif ($assign_var instanceof PhpParser\Node\Expr\ArrayDimFetch) {
ArrayAssignmentAnalyzer::analyze(
$statements_analyzer,
$assign_var,
$context,
$assign_value,
$assign_value_type
);
} elseif ($assign_var instanceof PhpParser\Node\Expr\PropertyFetch) {
self::analyzePropertyAssignment(
$statements_analyzer,
$codebase,
$assign_var,
$context,
$assign_value,
$assign_value_type,
$var_id
);
} elseif ($assign_var instanceof PhpParser\Node\Expr\StaticPropertyFetch &&
$assign_var->class instanceof PhpParser\Node\Name
) {
if (ExpressionAnalyzer::analyze($statements_analyzer, $assign_var, $context) === false) {
return false;
}
if ($context->check_classes) {
if (StaticPropertyAssignmentAnalyzer::analyze(
$statements_analyzer,
$assign_var,
$assign_value,
$assign_value_type,
$context
) === false) {
return false;
}
}
if ($var_id) {
$context->vars_possibly_in_scope[$var_id] = true;
}
}
if ($var_id && isset($context->vars_in_scope[$var_id])) {
if ($context->vars_in_scope[$var_id]->isVoid()) {
IssueBuffer::maybeAdd(
new AssignmentToVoid(
'Cannot assign ' . $var_id . ' to type void',
new CodeLocation($statements_analyzer->getSource(), $assign_var)
),
$statements_analyzer->getSuppressedIssues()
);
$context->vars_in_scope[$var_id] = Type::getNull();
$context->inside_assignment = $was_in_assignment;
return $context->vars_in_scope[$var_id];
}
if ($context->vars_in_scope[$var_id]->isNever()) {
if (IssueBuffer::accepts(
new NoValue(
'This function or method call never returns output',
new CodeLocation($statements_analyzer->getSource(), $assign_var)
),
$statements_analyzer->getSuppressedIssues()
)) {
return false;
}
$context->vars_in_scope[$var_id] = Type::getNever();
$context->inside_assignment = $was_in_assignment;
return $context->vars_in_scope[$var_id];
}
if ($statements_analyzer->data_flow_graph) {
$data_flow_graph = $statements_analyzer->data_flow_graph;
if ($context->vars_in_scope[$var_id]->parent_nodes) {
$context->vars_in_scope[$var_id] = clone $context->vars_in_scope[$var_id];
if ($data_flow_graph instanceof TaintFlowGraph
&& in_array('TaintedInput', $statements_analyzer->getSuppressedIssues())
) {
$context->vars_in_scope[$var_id]->parent_nodes = [];
} else {
$var_location = new CodeLocation($statements_analyzer->getSource(), $assign_var);
$event = new AddRemoveTaintsEvent($assign_var, $context, $statements_analyzer, $codebase);
$added_taints = $codebase->config->eventDispatcher->dispatchAddTaints($event);
$removed_taints = array_merge(
$removed_taints,
$codebase->config->eventDispatcher->dispatchRemoveTaints($event)
);
self::taintAssignment(
$context->vars_in_scope[$var_id],
$data_flow_graph,
$var_id,
$var_location,
$removed_taints,
$added_taints
);
}
if ($assign_expr) {
$new_parent_node = DataFlowNode::getForAssignment(
'assignment_expr',
new CodeLocation($statements_analyzer->getSource(), $assign_expr)
);
$data_flow_graph->addNode($new_parent_node);
foreach ($context->vars_in_scope[$var_id]->parent_nodes as $old_parent_node) {
$data_flow_graph->addPath(
$old_parent_node,
$new_parent_node,
'=',
);
}
$assign_value_type = clone $assign_value_type;
$assign_value_type->parent_nodes = [$new_parent_node->id => $new_parent_node];
}
}
}
}
$context->inside_assignment = $was_in_assignment;
return $assign_value_type;
}
public static function assignTypeFromVarDocblock(
StatementsAnalyzer $statements_analyzer,
PhpParser\Node $stmt,
VarDocblockComment $var_comment,
Context $context,
?string $var_id = null,
?Union &$comment_type = null,
?DocblockTypeLocation &$comment_type_location = null,
array $not_ignored_docblock_var_ids = []
): void {
if (!$var_comment->type) {
return;
}
$codebase = $statements_analyzer->getCodebase();
try {
$var_comment_type = TypeExpander::expandUnion(
$codebase,
$var_comment->type,
$context->self,
$context->self,
$statements_analyzer->getParentFQCLN()
);
$var_comment_type->setFromDocblock();
$var_comment_type->check(
$statements_analyzer,
new CodeLocation($statements_analyzer->getSource(), $stmt),
$statements_analyzer->getSuppressedIssues(),
[],
false,
false,
false,
$context->calling_method_id
);
$type_location = null;
if ($var_comment->type_start
&& $var_comment->type_end
&& $var_comment->line_number
) {
$type_location = new DocblockTypeLocation(
$statements_analyzer,
$var_comment->type_start,
$var_comment->type_end,
$var_comment->line_number
);
if ($codebase->alter_code) {
$codebase->classlikes->handleDocblockTypeInMigration(
$codebase,
$statements_analyzer,
$var_comment_type,
$type_location,
$context->calling_method_id
);
}
}
if (!$var_comment->var_id || $var_comment->var_id === $var_id) {
$comment_type = $var_comment_type;
$comment_type_location = $type_location;
return;
}
$project_analyzer = $statements_analyzer->getProjectAnalyzer();
if ($codebase->find_unused_variables
&& $type_location
&& (!$not_ignored_docblock_var_ids || isset($not_ignored_docblock_var_ids[$var_comment->var_id]))
&& isset($context->vars_in_scope[$var_comment->var_id])
&& $context->vars_in_scope[$var_comment->var_id]->getId() === $var_comment_type->getId()
&& !$var_comment_type->isMixed()
) {
if ($codebase->alter_code
&& isset($project_analyzer->getIssuesToFix()['UnnecessaryVarAnnotation'])
) {
FileManipulationBuffer::addVarAnnotationToRemove($type_location);
} elseif (IssueBuffer::accepts(
new UnnecessaryVarAnnotation(
'The @var ' . $var_comment_type . ' annotation for '
. $var_comment->var_id . ' is unnecessary',
$type_location
),
$statements_analyzer->getSuppressedIssues(),
true
)) {
// fall through
}
}
$parent_nodes = $context->vars_in_scope[$var_comment->var_id]->parent_nodes ?? [];
$var_comment_type->parent_nodes = $parent_nodes;
$context->vars_in_scope[$var_comment->var_id] = $var_comment_type;
} catch (UnexpectedValueException $e) {
IssueBuffer::maybeAdd(
new InvalidDocblock(
$e->getMessage(),
new CodeLocation($statements_analyzer->getSource(), $stmt)
)
);
}
}
/**
* @param array<string> $removed_taints
* @param array<string> $added_taints
*/
private static function taintAssignment(
Union $type,
DataFlowGraph $data_flow_graph,
string $var_id,
CodeLocation $var_location,
array $removed_taints,
array $added_taints
): void {
$parent_nodes = $type->parent_nodes;
$unspecialized_parent_nodes = array_filter(
$parent_nodes,
fn($parent_node) => !$parent_node->specialization_key
);
$specialized_parent_nodes = array_filter(
$parent_nodes,
fn($parent_node) => (bool) $parent_node->specialization_key
);
$new_parent_nodes = [];
foreach ($specialized_parent_nodes as $parent_node) {
$new_parent_node = DataFlowNode::getForAssignment($var_id, $var_location);
$new_parent_node->specialization_key = $parent_node->specialization_key;
$data_flow_graph->addNode($new_parent_node);
$new_parent_nodes += [$new_parent_node->id => $new_parent_node];
$data_flow_graph->addPath(
$parent_node,
$new_parent_node,
'=',
$added_taints,
$removed_taints
);
}
if ($unspecialized_parent_nodes) {
$new_parent_node = DataFlowNode::getForAssignment($var_id, $var_location);
$data_flow_graph->addNode($new_parent_node);
$new_parent_nodes += [$new_parent_node->id => $new_parent_node];
foreach ($unspecialized_parent_nodes as $parent_node) {
$data_flow_graph->addPath(
$parent_node,
$new_parent_node,
'=',
$added_taints,
$removed_taints
);
}
}
$type->parent_nodes = $new_parent_nodes;
}
public static function analyzeAssignmentOperation(
StatementsAnalyzer $statements_analyzer,
PhpParser\Node\Expr\AssignOp $stmt,
Context $context
): bool {
if ($stmt instanceof PhpParser\Node\Expr\AssignOp\BitwiseAnd) {
$operation = new VirtualBitwiseAnd($stmt->var, $stmt->expr, $stmt->getAttributes());
} elseif ($stmt instanceof PhpParser\Node\Expr\AssignOp\BitwiseOr) {
$operation = new VirtualBitwiseOr($stmt->var, $stmt->expr, $stmt->getAttributes());
} elseif ($stmt instanceof PhpParser\Node\Expr\AssignOp\BitwiseXor) {
$operation = new VirtualBitwiseXor($stmt->var, $stmt->expr, $stmt->getAttributes());
} elseif ($stmt instanceof PhpParser\Node\Expr\AssignOp\Coalesce) {
$operation = new VirtualCoalesce($stmt->var, $stmt->expr, $stmt->getAttributes());
} elseif ($stmt instanceof PhpParser\Node\Expr\AssignOp\Concat) {
$operation = new VirtualConcat($stmt->var, $stmt->expr, $stmt->getAttributes());
} elseif ($stmt instanceof PhpParser\Node\Expr\AssignOp\Div) {
$operation = new VirtualDiv($stmt->var, $stmt->expr, $stmt->getAttributes());
} elseif ($stmt instanceof PhpParser\Node\Expr\AssignOp\Minus) {
$operation = new VirtualMinus($stmt->var, $stmt->expr, $stmt->getAttributes());
} elseif ($stmt instanceof PhpParser\Node\Expr\AssignOp\Mod) {
$operation = new VirtualMod($stmt->var, $stmt->expr, $stmt->getAttributes());
} elseif ($stmt instanceof PhpParser\Node\Expr\AssignOp\Mul) {
$operation = new VirtualMul($stmt->var, $stmt->expr, $stmt->getAttributes());
} elseif ($stmt instanceof PhpParser\Node\Expr\AssignOp\Plus) {
$operation = new VirtualPlus($stmt->var, $stmt->expr, $stmt->getAttributes());
} elseif ($stmt instanceof PhpParser\Node\Expr\AssignOp\Pow) {
$operation = new VirtualPow($stmt->var, $stmt->expr, $stmt->getAttributes());
} elseif ($stmt instanceof PhpParser\Node\Expr\AssignOp\ShiftLeft) {
$operation = new VirtualShiftLeft($stmt->var, $stmt->expr, $stmt->getAttributes());
} elseif ($stmt instanceof PhpParser\Node\Expr\AssignOp\ShiftRight) {
$operation = new VirtualShiftRight($stmt->var, $stmt->expr, $stmt->getAttributes());
} else {
throw new UnexpectedValueException('Unknown assign op');
}
$fake_assignment = new VirtualAssign(
$stmt->var,
$operation,
$stmt->getAttributes()
);
$old_node_data = $statements_analyzer->node_data;
$statements_analyzer->node_data = clone $statements_analyzer->node_data;
if (ExpressionAnalyzer::analyze($statements_analyzer, $fake_assignment, $context) === false) {
return false;
}
$old_node_data->setType(
$stmt,
$statements_analyzer->node_data->getType($operation) ?? Type::getMixed()
);
$statements_analyzer->node_data = $old_node_data;
return true;
}
public static function analyzeAssignmentRef(
StatementsAnalyzer $statements_analyzer,
PhpParser\Node\Expr\AssignRef $stmt,
Context $context
): bool {
ExpressionAnalyzer::analyze($statements_analyzer, $stmt->expr, $context, false, null, false, null, true);
$lhs_var_id = ExpressionIdentifier::getExtendedVarId(
$stmt->var,
$statements_analyzer->getFQCLN(),
$statements_analyzer
);
$rhs_var_id = ExpressionIdentifier::getExtendedVarId(
$stmt->expr,
$statements_analyzer->getFQCLN(),
$statements_analyzer
);
$doc_comment = $stmt->getDocComment();
if ($doc_comment) {
try {
$var_comments = CommentAnalyzer::getTypeFromComment(
$doc_comment,
$statements_analyzer->getSource(),
$statements_analyzer->getAliases(),
);
} catch (IncorrectDocblockException $e) {
IssueBuffer::maybeAdd(
new MissingDocblockType(
$e->getMessage(),
new CodeLocation($statements_analyzer->getSource(), $stmt)
)
);
} catch (DocblockParseException $e) {
IssueBuffer::maybeAdd(
new InvalidDocblock(
$e->getMessage(),
new CodeLocation($statements_analyzer->getSource(), $stmt)
)
);
}
if (!empty($var_comments)) {
IssueBuffer::maybeAdd(
new InvalidDocblock(
"Docblock type cannot be used for reference assignment",
new CodeLocation($statements_analyzer->getSource(), $stmt)
)
);
}
}
if ($lhs_var_id === null || $rhs_var_id === null) {
return false;
}
if (!isset($context->vars_in_scope[$rhs_var_id])) {
// Sometimes the $rhs_var_id isn't set in $vars_in_scope, for example if it's an unknown array offset.
$context->vars_in_scope[$rhs_var_id] = $statements_analyzer->node_data->getType($stmt->expr)
?? Type::getMixed();
}
if (isset($context->references_in_scope[$lhs_var_id])) {
// Decrement old referenced variable's reference count
$reference_count = &$context->referenced_counts[$context->references_in_scope[$lhs_var_id]];
if ($reference_count < 1) {
throw new RuntimeException("Incorrect referenced count found");
}
--$reference_count;
// Remove old reference parent node so previously referenced variable usage doesn't count as reference usage
$old_type = $context->vars_in_scope[$lhs_var_id];
foreach ($old_type->parent_nodes as $old_parent_node_id => $_) {
if (strpos($old_parent_node_id, "$lhs_var_id-") === 0) {
unset($old_type->parent_nodes[$old_parent_node_id]);
}
}
}
// When assigning an existing reference as a reference it removes the
// old reference, so it's no longer potentially from a confusing scope.
unset($context->references_possibly_from_confusing_scope[$lhs_var_id]);
$context->vars_in_scope[$lhs_var_id] = &$context->vars_in_scope[$rhs_var_id];
$context->hasVariable($lhs_var_id);
$context->references_in_scope[$lhs_var_id] = $rhs_var_id;
$context->referenced_counts[$rhs_var_id] = ($context->referenced_counts[$rhs_var_id] ?? 0) + 1;
if (strpos($rhs_var_id, '[') !== false) {
// Reference to array item, we always consider array items to be an external scope for references
// TODO handle differently so it's detected as unused if the array is unused?
$context->references_to_external_scope[$lhs_var_id] = true;
}
if (strpos($rhs_var_id, '->') !== false) {
// Reference to object property, we always consider object properties to be an external scope for references
// TODO handle differently so it's detected as unused if the object is unused?
$context->references_to_external_scope[$lhs_var_id] = true;
}
$lhs_location = new CodeLocation($statements_analyzer->getSource(), $stmt->var);
$statements_analyzer->registerVariableAssignment(
$lhs_var_id,
$lhs_location
);
$lhs_node = DataFlowNode::getForAssignment($lhs_var_id, $lhs_location);
$context->vars_in_scope[$lhs_var_id]->parent_nodes[$lhs_node->id] = $lhs_node;
if (($stmt->var instanceof ArrayDimFetch || $stmt->var instanceof PropertyFetch)
&& $stmt->var->var instanceof Variable
&& is_string($stmt->var->var->name)
) {
// If left-hand-side is an array offset or object property, add an edge to the root
// variable, so if the root variable is used, the offset/property is also marked as used.
$root_var_id = "$" . $stmt->var->var->name;
foreach ($context->vars_in_scope[$root_var_id]->parent_nodes as $root_parent) {