php-in-php: runtime shrink closeout guard (#5211)

test/repro/issue_enum_unserialize_roundtrip.php

@@ -0,0 +1,8 @@
+<?php
+declare(strict_types=1);
+enum E: int { case A = 1; }
+$s = serialize(E::A);
+echo $s, "\n";
+$u = unserialize($s);
+var_export($u);
+echo "\n", ($u === E::A) ? "same\n" : "diff\n";

test/unit/RuntimeShrinkCloseoutTest.php

@@ -0,0 +1,100 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PHPCompiler;
+
+use PHPUnit\Framework\TestCase;
+
+/**
+ * php-in-php closeout guard (#5211, #1492): open queue issues #5200–#5708 C TUs deleted; LLVM/PHP SSOT in ext/ + lib/JIT/.
+ *
+ * @group aot-lint
+ */
+final class RuntimeShrinkCloseoutTest extends TestCase
+{
+    private string $repoRoot;
+
+    protected function setUp(): void
+    {
+        $this->repoRoot = dirname(__DIR__, 2);
+    }
+
+    /** @return list<string> */
+    private function deletedAotRuntimeSources(): array
+    {
+        return [
+            'phpc_settype.c',        // #5200
+            'phpc_dir.c',            // #5258 / #5494
+            'phpc_fs_dir.c',         // #5258 / #6982
+            'phpc_unserialize.c',    // #5280 / #5991
+            'phpc_string_cslashes.c', // #5278 / #5652
+            'phpc_class_methods.c', // #5290
+            'phpc_ini_set.c',        // #5363 / #5736
+            'phpc_json_decode.c',    // #5302 / #6202
+            'hash_crypto.c',         // #5227 / #7189
+            'password_crypto.c',     // #5234 / #5708 / #6906
+            'superglobals_refresh.c', // #5330
+            'phpc_stream.c',         // #5343 / #6821
+            'preg_match.c',          // #5289
+        ];
+    }
+
+    public function testDeletedPhpInPhpRuntimeSourcesAbsent(): void
+    {
+        $runtimeDir = $this->repoRoot.'/lib/AOT/runtime';
+        $linker = (string) file_get_contents($this->repoRoot.'/lib/AOT/Linker.php');
+        $jitBuiltinDir = $this->repoRoot.'/lib/JIT/Builtin';
+
+        foreach ($this->deletedAotRuntimeSources() as $basename) {
+            $this->assertFileDoesNotExist(
+                $runtimeDir.'/'.$basename,
+                "{$basename} must stay deleted (php-in-php migration)"
+            );
+            $this->assertFileDoesNotExist(
+                $jitBuiltinDir.'/'.$basename,
+                "lib/JIT/Builtin/{$basename} must not reappear"
+            );
+            $this->assertStringNotContainsString(
+                $basename,
+                $linker,
+                "Linker must not list {$basename}"
+            );
+        }
+    }
+
+    public function testPhpReplacementsPresent(): void
+    {
+        $checks = [
+            'ext/standard/JitSettype.php' => 'JitSettype',
+            'ext/standard/VmSerialize.php' => 'resolveEnumCaseVariable',
+            'lib/JIT/Builtin/StringUnserializeJit.php' => '__compiler_unserialize',
+            'lib/JIT/Builtin/IniRuntime.php' => 'VmIni',
+            'lib/JIT/Builtin/StringJsonDecodeJit.php' => '__compiler_json_decode',
+            'lib/JIT/Builtin/StringPasswordCryptoJit.php' => 'password_hash',
+            'lib/JIT/Builtin/StringHashCryptoNativeJit.php' => 'hash',
+            'lib/JIT/Builtin/StringDirJit.php' => 'phpc_dir',
+            'lib/JIT/Builtin/StringFsDirJit.php' => 'StringFsDirJit',
+            'ext/standard/stripcslashes.php' => 'VmString',
+        ];
+
+        foreach ($checks as $relativePath => $needle) {
+            $path = $this->repoRoot.'/'.$relativePath;
+            $this->assertFileExists($path, "{$relativePath} must exist as PHP SSOT");
+            $source = (string) file_get_contents($path);
+            $this->assertStringContainsString($needle, $source, "{$relativePath} must implement {$needle}");
+        }
+    }
+
+    public function testOnlyProgressAbiRemainsInAotRuntime(): void
+    {
+        $runtimeDir = $this->repoRoot.'/lib/AOT/runtime';
+        $cFiles = glob($runtimeDir.'/*.c') ?: [];
+        sort($cFiles);
+        $this->assertSame(
+            [$runtimeDir.'/phpc_progress.c'],
+            $cFiles,
+            'Only phpc_progress.c (frozen SIGSEGV ABI) may remain under lib/AOT/runtime/'
+        );
+    }
+}