From b96ca49db4ce5cd7d396fbb28fbf67d42adba81e Mon Sep 17 00:00:00 2001
From: Tomas Votruba <tomas.vot@gmail.com>
Date: Mon, 19 Oct 2026 10:58:33 +0200
Subject: [PATCH] [perf] Skip ancestor reflection when no parent:: call to trim
 in RemoveArgumentFromDefaultParentCallRector

---
 ...rgument_from_default_parent_call_bench.php | 100 ++++++++++++++++++
 ...oveArgumentFromDefaultParentCallRector.php |  34 ++++++
 2 files changed, 134 insertions(+)
 create mode 100644 bench/remove_argument_from_default_parent_call_bench.php

diff --git a/bench/remove_argument_from_default_parent_call_bench.php b/bench/remove_argument_from_default_parent_call_bench.php
new file mode 100644
index 00000000000..2811e2dcb6a
--- /dev/null
+++ b/bench/remove_argument_from_default_parent_call_bench.php
@@ -0,0 +1,100 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * Benchmark for RemoveArgumentFromDefaultParentCallRector.
+ *
+ * The rule subscribes to Class_. For every class that extends a parent it resolved the class
+ * reflection and walked getAncestors() - native reflection over the whole ancestor chain -
+ * before even checking whether the class body contains a parent:: call to trim. A subclass
+ * that never calls parent:: (the common case) paid for that ancestor lookup only to find
+ * nothing to do.
+ *
+ * The optimization adds a cheap AST pre-scan (hasParentStaticCall): if no method body holds a
+ * parent:: static call, the rule bails before resolveClassReflection()/getAncestors().
+ *
+ * This bench parses a file of many subclasses that extend a parent but never call parent::,
+ * attaches scope (as the real run does), then drives refactor() over every Class_ node. Those
+ * nodes never change, so the calls are repeatable.
+ *
+ * Run on both branches to compare:
+ *   php bench/remove_argument_from_default_parent_call_bench.php
+ *
+ * Reports CPU time (user+sys) and wall time; CPU is the reliable metric, wall is noisy
+ * under concurrent load.
+ */
+
+use PhpParser\Node\Stmt\Class_;
+use Rector\DeadCode\Rector\ClassMethod\RemoveArgumentFromDefaultParentCallRector;
+use Rector\DependencyInjection\LazyContainerFactory;
+use Rector\PhpParser\Node\BetterNodeFinder;
+use Rector\Testing\TestingParser\TestingParser;
+
+require __DIR__ . '/../vendor/autoload.php';
+
+const CHILDREN = 150; // subclasses that extend a parent but never call parent::
+const REPEAT = 60;    // outer repeats over the whole class set
+
+$rectorConfig = (new LazyContainerFactory())->create();
+$rectorConfig->boot();
+
+/** @var TestingParser $testingParser */
+$testingParser = $rectorConfig->make(TestingParser::class);
+
+/** @var BetterNodeFinder $betterNodeFinder */
+$betterNodeFinder = $rectorConfig->make(BetterNodeFinder::class);
+
+$rector = $rectorConfig->make(RemoveArgumentFromDefaultParentCallRector::class);
+
+// generate a file: one parent with a defaulted constructor param, many children that extend it
+// but only call an ordinary function - no parent:: call, so the rule has nothing to trim
+$source = "<?php\n\nnamespace Bench;\n\n";
+$source .= "class SomeParent\n{\n    public function __construct(array \$param = [])\n    {\n    }\n}\n\n";
+for ($i = 0; $i < CHILDREN; ++$i) {
+    $source .= "class Child{$i} extends \\Bench\\SomeParent\n{\n";
+    $source .= "    public function __construct(string \$differentParam)\n    {\n";
+    $source .= "        strlen(\$differentParam);\n";
+    $source .= "    }\n}\n\n";
+}
+
+$sourceFilePath = tempnam(sys_get_temp_dir(), 'bench_') . '.php';
+file_put_contents($sourceFilePath, $source);
+
+$stmts = $testingParser->parseFileToDecoratedNodes($sourceFilePath);
+
+/** @var Class_[] $classes */
+$classes = $betterNodeFinder->findInstanceOf($stmts, Class_::class);
+
+$cpuSeconds = static function (): float {
+    $usage = getrusage();
+    return $usage['ru_utime.tv_sec'] + $usage['ru_utime.tv_usec'] / 1_000_000
+        + $usage['ru_stime.tv_sec'] + $usage['ru_stime.tv_usec'] / 1_000_000;
+};
+
+$run = static function () use ($rector, $classes): void {
+    foreach ($classes as $class) {
+        $rector->refactor($class);
+    }
+};
+
+// warm up autoloading/reflection caches once, excluded from timing
+$run();
+
+$wallStart = microtime(true);
+$cpuStart = $cpuSeconds();
+
+for ($repeat = 0; $repeat < REPEAT; ++$repeat) {
+    $run();
+}
+
+$cpu = $cpuSeconds() - $cpuStart;
+$wall = microtime(true) - $wallStart;
+
+@unlink($sourceFilePath);
+
+$totalCalls = REPEAT * count($classes);
+
+printf('classes: %d, repeats: %d, refactor() calls: %d%s', count($classes), REPEAT, $totalCalls, PHP_EOL);
+printf('CPU:  %.4f s  (%.3f us/call)%s', $cpu, $cpu / $totalCalls * 1_000_000, PHP_EOL);
+printf('wall: %.4f s%s', $wall, PHP_EOL);
diff --git a/rules/DeadCode/Rector/ClassMethod/RemoveArgumentFromDefaultParentCallRector.php b/rules/DeadCode/Rector/ClassMethod/RemoveArgumentFromDefaultParentCallRector.php
index 00c46be33e8..8b772a358f5 100644
--- a/rules/DeadCode/Rector/ClassMethod/RemoveArgumentFromDefaultParentCallRector.php
+++ b/rules/DeadCode/Rector/ClassMethod/RemoveArgumentFromDefaultParentCallRector.php
@@ -96,6 +96,11 @@ public function refactor(Node $node): ?Class_
             return null;
         }
 
+        // no parent:: call to trim? skip the ancestor reflection lookup
+        if (! $this->hasParentStaticCall($node)) {
+            return null;
+        }
+
         $classReflection = $this->reflectionResolver->resolveClassReflection($node);
 
         if (! $classReflection instanceof ClassReflection) {
@@ -204,4 +209,33 @@ public function refactor(Node $node): ?Class_
 
         return $node;
     }
+
+    private function hasParentStaticCall(Class_ $class): bool
+    {
+        foreach ($class->getMethods() as $classMethod) {
+            if ($classMethod->isPrivate()) {
+                continue;
+            }
+
+            if ($classMethod->isAbstract()) {
+                continue;
+            }
+
+            foreach ((array) $classMethod->stmts as $stmt) {
+                if (! $stmt instanceof Expression) {
+                    continue;
+                }
+
+                if (! $stmt->expr instanceof StaticCall) {
+                    continue;
+                }
+
+                if ($this->isName($stmt->expr->class, 'parent')) {
+                    return true;
+                }
+            }
+        }
+
+        return false;
+    }
 }