Implement BinaryModHandler

src/Analyser/Generator/ExprHandler/BinaryDivHandler.php

@@ -2,6 +2,7 @@
 
 namespace PHPStan\Analyser\Generator\ExprHandler;
 
+use DivisionByZeroError;
 use Generator;
 use PhpParser\Node\Expr;
 use PhpParser\Node\Stmt;
@@ -10,9 +11,12 @@
 use PHPStan\Analyser\Generator\ExprAnalysisResult;
 use PHPStan\Analyser\Generator\ExprHandler;
 use PHPStan\Analyser\Generator\GeneratorScope;
+use PHPStan\Analyser\Generator\InternalThrowPoint;
 use PHPStan\Analyser\SpecifiedTypes;
 use PHPStan\DependencyInjection\AutowiredService;
 use PHPStan\Reflection\InitializerExprTypeResolver;
+use PHPStan\Type\Constant\ConstantIntegerType;
+use PHPStan\Type\ObjectType;
 use function array_merge;
 
 /**
@@ -36,13 +40,20 @@ public function analyseExpr(Stmt $stmt, Expr $expr, GeneratorScope $scope, Expre
 		$leftResult = yield new ExprAnalysisRequest($stmt, $expr->left, $scope, $context, $alternativeNodeCallback);
 		$rightResult = yield new ExprAnalysisRequest($stmt, $expr->right, $leftResult->scope, $context, $alternativeNodeCallback);
 
+		$throwPoints = array_merge($leftResult->throwPoints, $rightResult->throwPoints);
+		if (
+			!$rightResult->type->toNumber()->isSuperTypeOf(new ConstantIntegerType(0))->no()
+		) {
+			$throwPoints[] = InternalThrowPoint::createExplicit($scope, new ObjectType(DivisionByZeroError::class), $expr, false);
+		}
+
 		return new ExprAnalysisResult(
 			$this->initializerExprTypeResolver->getDivTypeFromTypes($expr->left, $expr->right, $leftResult->type, $rightResult->type),
 			$this->initializerExprTypeResolver->getDivTypeFromTypes($expr->left, $expr->right, $leftResult->nativeType, $rightResult->nativeType),
 			$rightResult->scope,
 			hasYield: $leftResult->hasYield || $rightResult->hasYield,
 			isAlwaysTerminating: $leftResult->isAlwaysTerminating || $rightResult->isAlwaysTerminating,
-			throwPoints: array_merge($leftResult->throwPoints, $rightResult->throwPoints),
+			throwPoints: $throwPoints,
 			impurePoints: array_merge($leftResult->impurePoints, $rightResult->impurePoints),
 			specifiedTruthyTypes: new SpecifiedTypes(),
 			specifiedFalseyTypes: new SpecifiedTypes(),

src/Analyser/Generator/ExprHandler/BinaryModHandler.php

@@ -0,0 +1,64 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Analyser\Generator\ExprHandler;
+
+use DivisionByZeroError;
+use Generator;
+use PhpParser\Node\Expr;
+use PhpParser\Node\Stmt;
+use PHPStan\Analyser\ExpressionContext;
+use PHPStan\Analyser\Generator\ExprAnalysisRequest;
+use PHPStan\Analyser\Generator\ExprAnalysisResult;
+use PHPStan\Analyser\Generator\ExprHandler;
+use PHPStan\Analyser\Generator\GeneratorScope;
+use PHPStan\Analyser\Generator\InternalThrowPoint;
+use PHPStan\Analyser\SpecifiedTypes;
+use PHPStan\DependencyInjection\AutowiredService;
+use PHPStan\Reflection\InitializerExprTypeResolver;
+use PHPStan\Type\Constant\ConstantIntegerType;
+use PHPStan\Type\ObjectType;
+use function array_merge;
+
+/**
+ * @implements ExprHandler<Expr\BinaryOp\Mod>
+ */
+#[AutowiredService]
+final class BinaryModHandler implements ExprHandler
+{
+
+	public function __construct(private InitializerExprTypeResolver $initializerExprTypeResolver)
+	{
+	}
+
+	public function supports(Expr $expr): bool
+	{
+		return $expr instanceof Expr\BinaryOp\Mod;
+	}
+
+	public function analyseExpr(Stmt $stmt, Expr $expr, GeneratorScope $scope, ExpressionContext $context, ?callable $alternativeNodeCallback): Generator
+	{
+		$leftResult = yield new ExprAnalysisRequest($stmt, $expr->left, $scope, $context, $alternativeNodeCallback);
+		$rightResult = yield new ExprAnalysisRequest($stmt, $expr->right, $leftResult->scope, $context, $alternativeNodeCallback);
+
+		$throwPoints = array_merge($leftResult->throwPoints, $rightResult->throwPoints);
+		if (
+			!$rightResult->type->toNumber()->isSuperTypeOf(new ConstantIntegerType(0))->no()
+		) {
+			$throwPoints[] = InternalThrowPoint::createExplicit($scope, new ObjectType(DivisionByZeroError::class), $expr, false);
+		}
+
+		return new ExprAnalysisResult(
+			$this->initializerExprTypeResolver->getModTypeFromTypes($expr->left, $expr->right, $leftResult->type, $rightResult->type),
+			$this->initializerExprTypeResolver->getModTypeFromTypes($expr->left, $expr->right, $leftResult->nativeType, $rightResult->nativeType),
+			$rightResult->scope,
+			hasYield: $leftResult->hasYield || $rightResult->hasYield,
+			isAlwaysTerminating: $leftResult->isAlwaysTerminating || $rightResult->isAlwaysTerminating,
+			throwPoints: $throwPoints,
+			impurePoints: array_merge($leftResult->impurePoints, $rightResult->impurePoints),
+			specifiedTruthyTypes: new SpecifiedTypes(),
+			specifiedFalseyTypes: new SpecifiedTypes(),
+			specifiedNullTypes: new SpecifiedTypes(),
+		);
+	}
+
+}

src/Reflection/InitializerExprTypeResolver.php

@@ -1238,6 +1238,11 @@ public function getModType(Expr $left, Expr $right, callable $getTypeCallback):
 		$leftType = $getTypeCallback($left);
 		$rightType = $getTypeCallback($right);
 
+		return $this->getModTypeFromTypes($left, $right, $leftType, $rightType);
+	}
+
+	public function getModTypeFromTypes(Expr $left, Expr $right, Type $leftType, Type $rightType): Type
+	{
 		if ($leftType instanceof NeverType || $rightType instanceof NeverType) {
 			return $this->getNeverType($leftType, $rightType);
 		}

tests/PHPStan/Analyser/Generator/data/gnsr.php

@@ -5,6 +5,7 @@
 namespace GeneratorNodeScopeResolverTest;
 
 use Closure;
+use DivisionByZeroError;
 use function PHPStan\Testing\assertNativeType;
 use function PHPStan\Testing\assertType;
 
@@ -50,6 +51,25 @@ public function doDiv($a, $b, int $c, int $d): void
 		assertNativeType('1', 1 / 1);
 		assertType('(float|int)', $c / $d);
 		assertNativeType('(float|int)', $c / $d);
+
+		assertType('*ERROR*', $c / 0); // DivisionByZeroError
+	}
+
+	/**
+	 * @param int $a
+	 * @param int $b
+	 * @return void
+	 */
+	public function doMod($a, $b, int $c, int $d): void
+	{
+		assertType('int', $a % $b);
+		assertNativeType('int', $a % $b);
+		assertType('0', 1 % 1);
+		assertNativeType('0', 1 % 1);
+		assertType('int', $c % $d);
+		assertNativeType('int', $c % $d);
+
+		assertType('*ERROR*', $c % 0); // DivisionByZeroError
 	}
 
 	/**