diff --git a/bin/gen_stub.php b/bin/gen_stub.php
index 5a902958..4f724d4a 100755
--- a/bin/gen_stub.php
+++ b/bin/gen_stub.php
@@ -80,7 +80,8 @@ function processStubFile(string $stubFile, Context $context, bool $includeOnly =
         if (!$includeOnly) {
             global $translator;
             $stubFilenameWithoutExtension = $translator->getArgInfoStubFilename($stubFile);
-            $arginfoFile = $translator->getArgInfoHeaderFile($stubFilenameWithoutExtension);
+            $arginfoFile = $context->objectFile;
+            var_dump($arginfoFile);
             $legacyFile = "{$stubFilenameWithoutExtension}_legacy_arginfo.h";
 
             $stubCode = file_get_contents($stubFile);
@@ -174,6 +175,7 @@ class Context {
     public array $allConstInfos = [];
     /** @var FileInfo[] */
     public array $parsedFiles = [];
+    public string $objectFile = '';
 }
 
 class ArrayType extends SimpleType {
@@ -6171,7 +6173,7 @@ function main()
 
     $opt_index = 0;
     $options = getopt(
-        "fh",
+        "fho:",
         [
             "force-regeneration", "parameter-stats", "help", "verify", "verify-manual", "replace-predefined-constants",
             "generate-classsynopses", "replace-classsynopses", "generate-methodsynopses", "replace-methodsynopses",
@@ -6192,6 +6194,7 @@ function main()
     $generateOptimizerInfo = isset($options["generate-optimizer-info"]);
 
     $context->forceRegeneration = isset($options["f"]) || isset($options["force-regeneration"]);
+    $context->objectFile = $options["o"] ?? '';
     $context->forceParse = $context->forceRegeneration || $printParameterStats || $verify || $verifyManual || $replacePredefinedConstants || $generateClassSynopses || $generateOptimizerInfo || $replaceClassSynopses || $generateMethodSynopses || $replaceMethodSynopses;
 
     if (isset($options["h"]) || isset($options["help"])) {
diff --git a/src/Php/CompilerBase.php b/src/Php/CompilerBase.php
index 190e1a1e..b678acd8 100644
--- a/src/Php/CompilerBase.php
+++ b/src/Php/CompilerBase.php
@@ -1512,7 +1512,6 @@ class CompilerBase extends \PhpAot\Core\Translator
                 if ($this->isNativeFunction($name)) {
                     return $this->nativeFunctions[$name]->returnType;
                 }
-
                 return $this->detectFuncCallReturnType($name);
             case 'Expr_New':
                 return self::TYPE_OBJECT;
@@ -1945,28 +1944,35 @@ class CompilerBase extends \PhpAot\Core\Translator
      */
     protected function findNativeFunction(string $fname): string|false
     {
-        $possibleFunctionNames = [$this->escapeName($fname)];
-        if (isset($this->useAliases[$fname])) {
-            $possibleFunctionNames[] = $this->escapeName($this->escapeNamespace($this->useAliases[$fname]));
-        }
-        if ($this->namespace) {
-            $possibleFunctionNames[] = $this->escapeNamespace($this->namespace) . self::NAMESPACE_SEPARATOR . $fname;
-        }
-        if (isset($this->useFunctions[$fname])) {
-            $possibleFunctionNames[] = $this->escapeNamespace($this->useFunctions[$fname]) . self::NAMESPACE_SEPARATOR . $fname;
-        }
-        // 复杂命名空间规则，组合命名空间
-        // 例子：use foo\bar;  bar\fn();
-        foreach ($this->useNamespaces as $use) {
-            $ns1 = explode('\\', $use);
-            $ns2 = explode('\\', $fname);
-            if ($ns1[array_key_last($ns1)] === $ns2[array_key_first($ns2)]) {
-                $ns = array_merge($ns1, $ns2);
-                array_splice($ns, array_key_last($ns1) + 1);
-                $possibleFunctionNames[] = $this->escapeNamespace(implode('\\', $ns));
-                break;
+        // 绝对命名空间的函数
+        if ($fname[0] == '\\') {
+            $fname = ltrim($fname, '\\');
+            $possibleFunctionNames = [$this->escapeName($fname)];
+        } else {
+            $possibleFunctionNames = [$this->escapeName($fname)];
+            if (isset($this->useAliases[$fname])) {
+                $possibleFunctionNames[] = $this->escapeName($this->escapeNamespace($this->useAliases[$fname]));
+            }
+            if ($this->namespace) {
+                $possibleFunctionNames[] = $this->escapeNamespace($this->namespace) . self::NAMESPACE_SEPARATOR . $fname;
+            }
+            if (isset($this->useFunctions[$fname])) {
+                $possibleFunctionNames[] = $this->escapeNamespace($this->useFunctions[$fname]) . self::NAMESPACE_SEPARATOR . $fname;
+            }
+            // 复杂命名空间规则，组合命名空间
+            // 例子：use foo\bar;  bar\fn();
+            foreach ($this->useNamespaces as $use) {
+                $ns1 = explode('\\', $use);
+                $ns2 = explode('\\', $fname);
+                if ($ns1[array_key_last($ns1)] === $ns2[array_key_first($ns2)]) {
+                    $ns = array_merge($ns1, $ns2);
+                    array_splice($ns, array_key_last($ns1) + 1);
+                    $possibleFunctionNames[] = $this->escapeNamespace(implode('\\', $ns));
+                    break;
+                }
             }
         }
+
         foreach ($possibleFunctionNames as $name) {
             // 在预处理阶段检测到函数声明，但是未定义，说明在当前文件，但是顺序错误
             // 跳过，稍后再处理
@@ -1992,12 +1998,11 @@ class CompilerBase extends \PhpAot\Core\Translator
     protected function parseFuncCall(Node\Expr\FuncCall $expr, bool $silent = false): string
     {
         $call = '';
-        $placeHolder = '';
         if ($this->isVarExpr($expr->name)) {
             $fn   = $this->parseIdentifier($expr->name);
             $placeHolder = $fn;
             $name = '';
-        } elseif ($expr->name->getType() === 'Name') {
+        } elseif ($expr->name->getType() === 'Name' or $expr->name->getType() === 'Name_FullyQualified') {
             $name = $this->parseIdentifier($expr->name);
             if (in_array($name, $this->unsupportedFunctions)) {
                 $this->fatalError($expr, 'Unsupported function: `' . $name . '`');
diff --git a/src/Php/Translator.php b/src/Php/Translator.php
index d808d211..b72fda4a 100644
--- a/src/Php/Translator.php
+++ b/src/Php/Translator.php
@@ -27,6 +27,7 @@ class Translator extends Preprocessor
 {
     use MagicMethodDetector;
     protected string $targetName = 'app';
+    protected array $sourceDirs = [];
     protected bool $verbose = false;
     protected array $phpSrcFiles = [];
     protected array $argInfoHeaderFiles = [];
@@ -152,6 +153,7 @@ class Translator extends Preprocessor
             $list       = $this->getFilesFromDir($path);
             $targetName = basename($path);
             $this->setTargetName($targetName);
+            $this->sourceDirs[] = $path;
         } else {
             $ext = pathinfo($path, PATHINFO_EXTENSION);
             if ($ext === 'yml') {
@@ -160,6 +162,7 @@ class Translator extends Preprocessor
                 $list       = [$path];
                 $targetName = FileScanner::getFileName($path);
                 $this->setTargetName($targetName);
+                $this->sourceDirs[] = dirname($path);
             } else {
                 $this->error('Unsupported file type: ' . $path);
             }
@@ -340,9 +343,16 @@ class Translator extends Preprocessor
 
     public function getArgInfoHeaderFile(string $stubFilenameWithoutExtension, bool $relative = false): string
     {
-        $basename = self::PREFIX . basename($stubFilenameWithoutExtension);
-        $basename = $this->escapeFileName($basename);
-        $absPath  = $this->getIncludeDir() . "/{$basename}_arginfo.h";
+        foreach ($this->sourceDirs as $srcDir) {
+            if (str_starts_with($stubFilenameWithoutExtension, $srcDir)) {
+                $filePath = ltrim($this->removeCommonPrefix($srcDir, $stubFilenameWithoutExtension), '/');
+                break;
+            }
+        }
+
+        $filename = self::PREFIX . str_replace('/', '_', $filePath);
+        $filename = $this->escapeFileName($filename);
+        $absPath = $this->getIncludeDir() . "/{$filename}_arginfo.h";
         if ($relative) {
             return ltrim($this->removeCommonPrefix($this->getIncludeDir(), $absPath), '/');
         }
@@ -414,9 +424,11 @@ class Translator extends Preprocessor
                 }
                 if (is_file($realPath)) {
                     $list[] = $realPath;
+                    $this->sourceDirs[] = basename($realPath);
                 } else {
-                    $tmp  = $this->getFilesFromDir($realPath);
+                    $tmp = $this->getFilesFromDir($realPath);
                     $list = array_merge($list, $tmp);
+                    $this->sourceDirs[] = $realPath;
                 }
             }
         } else {
@@ -646,12 +658,14 @@ class Translator extends Preprocessor
 
     protected function genStubFile(string $file): void
     {
-        $genStubCmd = PHP_BINARY . ' ' . $this->rootPath . '/bin/gen_stub.php -f ' . $file;
-        $output     = shell_exec($genStubCmd);
-        $this->climate->info('generate stub file: ' . $file);
-        $this->climate->comment($genStubCmd);
         $stubFilenameWithoutExtension = str_replace(['.stub.php', '.php'], '', $file);
         $headerFile = $this->getArgInfoHeaderFile($stubFilenameWithoutExtension, true);
+
+        $genStubCmd = PHP_BINARY . ' ' . $this->rootPath . '/bin/gen_stub.php -f -o ' . $this->getIncludeDir() . '/' . $headerFile . ' ' . $file;
+        $output = shell_exec($genStubCmd);
+        $this->climate->info('generate stub file: ' . $file);
+        $this->climate->comment($genStubCmd);
+
         if (!str_contains($output, 'Saved')) {
             $this->error("failed to generate arginfo header file: `{$headerFile}`, output: {$output}");
         }
diff --git a/tests/aot/fn-call-001.phpt b/tests/aot/fn-call-001.phpt
new file mode 100644
index 00000000..3503c537
--- /dev/null
+++ b/tests/aot/fn-call-001.phpt
@@ -0,0 +1,16 @@
+--TEST--
+fn call 001
+--FILE--
+<?php
+function main()
+{
+    if (\class_exists('\\\\Event', false)) {
+        $className = '\\\\Event';
+    } else {
+        $className = '\Event';
+    }
+    var_dump($className);
+}
+?>
+--EXPECT--
+string(6) "\Event"