Add throw point for division by zero

Author: rajyan

src/Analyser/MutatingScope.php

@@ -2939,11 +2939,18 @@ private function calculateFromScalars(Expr $node, ConstantScalarType $leftType,
 		}
 
 		if ($node instanceof Node\Expr\BinaryOp\Div || $node instanceof Node\Expr\AssignOp\Div) {
+			if ($rightNumberValue === 0 || $rightNumberValue === 0.0) {
+				return new ErrorType();
+			}
 			return $this->getTypeFromValue($leftNumberValue / $rightNumberValue);
 		}
 
 		if ($node instanceof Node\Expr\BinaryOp\Mod || $node instanceof Node\Expr\AssignOp\Mod) {
-			return $this->getTypeFromValue(((int) $leftNumberValue) % ((int) $rightNumberValue));
+			$rightIntegerValue = (int) $rightNumberValue;
+			if ($rightIntegerValue === 0) {
+				return new ErrorType();
+			}
+			return $this->getTypeFromValue(((int) $leftNumberValue) % $rightIntegerValue);
 		}
 
 		if ($node instanceof Expr\BinaryOp\ShiftLeft || $node instanceof Expr\AssignOp\ShiftLeft) {

src/Analyser/NodeScopeResolver.php

@@ -4,6 +4,7 @@
 
 use ArrayAccess;
 use Closure;
+use DivisionByZeroError;
 use PhpParser\Comment\Doc;
 use PhpParser\Node;
 use PhpParser\Node\Arg;
@@ -116,6 +117,7 @@
 use PHPStan\Type\Constant\ConstantArrayType;
 use PHPStan\Type\Constant\ConstantArrayTypeBuilder;
 use PHPStan\Type\Constant\ConstantBooleanType;
+use PHPStan\Type\Constant\ConstantIntegerType;
 use PHPStan\Type\Constant\ConstantStringType;
 use PHPStan\Type\ErrorType;
 use PHPStan\Type\FileTypeMapper;
@@ -1745,6 +1747,12 @@ function (MutatingScope $scope) use ($expr, $nodeCallback, $context): Expression
 			$scope = $result->getScope();
 			$hasYield = $result->hasYield();
 			$throwPoints = $result->getThrowPoints();
+			if (
+				($expr instanceof Expr\AssignOp\Div || $expr instanceof Expr\AssignOp\Mod) &&
+				!$scope->getType($expr->expr)->toNumber()->isSuperTypeOf(new ConstantIntegerType(0))->no()
+			) {
+				$throwPoints[] = ThrowPoint::createExplicit($scope, new ObjectType(DivisionByZeroError::class), $expr, false);
+			}
 		} elseif ($expr instanceof FuncCall) {
 			$parametersAcceptor = null;
 			$functionReflection = null;
@@ -2310,6 +2318,12 @@ static function (?Type $offsetType, Type $valueType) use (&$arrayType): void {
 			$hasYield = $result->hasYield();
 			$throwPoints = $result->getThrowPoints();
 			$result = $this->processExprNode($expr->right, $scope, $nodeCallback, $context->enterDeep());
+			if (
+				($expr instanceof BinaryOp\Div || $expr instanceof BinaryOp\Mod) &&
+				!$scope->getType($expr->right)->toNumber()->isSuperTypeOf(new ConstantIntegerType(0))->no()
+			) {
+				$throwPoints[] = ThrowPoint::createExplicit($scope, new ObjectType(DivisionByZeroError::class), $expr, false);
+			}
 			$scope = $result->getScope();
 			$hasYield = $hasYield || $result->hasYield();
 			$throwPoints = array_merge($throwPoints, $result->getThrowPoints());

src/Parallel/Scheduler.php

@@ -13,6 +13,8 @@ class Scheduler
 
 	/**
 	 * @param positive-int $jobSize
+	 * @param positive-int $maximumNumberOfProcesses
+	 * @param positive-int $minimumNumberOfJobsPerProcess
 	 */
 	public function __construct(
 		private int $jobSize,

tests/PHPStan/Parallel/SchedulerTest.php

@@ -73,6 +73,8 @@ public function dataSchedule(): array
 	/**
 	 * @dataProvider dataSchedule
 	 * @param positive-int $jobSize
+	 * @param positive-int $maximumNumberOfProcesses
+	 * @param positive-int $minimumNumberOfJobsPerProcess
 	 * @param 0|positive-int $numberOfFiles
 	 * @param array<int> $expectedJobSizes
 	 */

tests/PHPStan/Rules/Exceptions/CatchWithUnthrownExceptionRuleTest.php

@@ -334,4 +334,94 @@ public function testUnionTypeError(): void
 		]);
 	}
 
+	public function testBug6349(): void
+	{
+		$this->analyse([__DIR__ . '/data/bug-6349.php'], [
+			[
+				'Dead catch - DivisionByZeroError is never thrown in the try block.',
+				29,
+			],
+			[
+				'Dead catch - DivisionByZeroError is never thrown in the try block.',
+				33,
+			],
+			[
+				'Dead catch - DivisionByZeroError is never thrown in the try block.',
+				44,
+			],
+			[
+				'Dead catch - DivisionByZeroError is never thrown in the try block.',
+				48,
+			],
+			[
+				'Dead catch - DivisionByZeroError is never thrown in the try block.',
+				106,
+			],
+			[
+				'Dead catch - DivisionByZeroError is never thrown in the try block.',
+				110,
+			],
+			[
+				'Dead catch - DivisionByZeroError is never thrown in the try block.',
+				121,
+			],
+			[
+				'Dead catch - DivisionByZeroError is never thrown in the try block.',
+				125,
+			],
+			[
+				// throw point not implemented yet, because there is no way to narrow float value by !== 0.0
+				'Dead catch - DivisionByZeroError is never thrown in the try block.',
+				139,
+			],
+			[
+				// throw point not implemented yet, because there is no way to narrow float value by !== 0.0
+				'Dead catch - DivisionByZeroError is never thrown in the try block.',
+				143,
+			],
+			[
+				'Dead catch - DivisionByZeroError is never thrown in the try block.',
+				172,
+			],
+			[
+				'Dead catch - DivisionByZeroError is never thrown in the try block.',
+				176,
+			],
+			[
+				'Dead catch - DivisionByZeroError is never thrown in the try block.',
+				187,
+			],
+			[
+				'Dead catch - DivisionByZeroError is never thrown in the try block.',
+				191,
+			],
+			[
+				'Dead catch - DivisionByZeroError is never thrown in the try block.',
+				249,
+			],
+			[
+				'Dead catch - DivisionByZeroError is never thrown in the try block.',
+				253,
+			],
+			[
+				'Dead catch - DivisionByZeroError is never thrown in the try block.',
+				264,
+			],
+			[
+				'Dead catch - DivisionByZeroError is never thrown in the try block.',
+				268,
+			],
+			[
+				// throw point not implemented yet, because there is no way to narrow float value by !== 0.0
+				'Dead catch - DivisionByZeroError is never thrown in the try block.',
+				282,
+			],
+			[
+				// throw point not implemented yet, because there is no way to narrow float value by !== 0.0
+				'Dead catch - DivisionByZeroError is never thrown in the try block.',
+				286,
+			],
+		]);
+	}
+
 }