Several changes made:

 * Do not overload entry point
 * Automatically call Program::__construct()
 * Automatically call Program::main();
 * Fix all tests

engine/vm.c

@@ -5698,14 +5698,38 @@ static void VmInvokeShutdownCallbacks(ph7_vm *pVm) {
  * See block-comment on that function for additional information.
  */
 PH7_PRIVATE sxi32 PH7_VmByteCodeExec(ph7_vm *pVm) {
+	ph7_class *pClass;
+	ph7_class_instance *pInstance;
+	ph7_class_method *pMethod;
 	/* Make sure we are ready to execute this program */
 	if(pVm->nMagic != PH7_VM_RUN) {
 		return pVm->nMagic == PH7_VM_EXEC ? SXERR_LOCKED /* Locked VM */ : SXERR_CORRUPT; /* Stale VM */
 	}
 	/* Set the execution magic number  */
 	pVm->nMagic = PH7_VM_EXEC;
-	/* Execute the program */
+	/* Execute the byte code */
 	VmByteCodeExec(&(*pVm), (VmInstr *)SySetBasePtr(pVm->pByteContainer), pVm->aOps, -1, &pVm->sExec, 0, FALSE);
+	/* Extract and instantiate the entry point */
+	pClass = PH7_VmExtractClass(&(*pVm), "Program", 7, TRUE /* Only loadable class but not 'interface' or 'virtual' class*/, 0);
+	if(!pClass) {
+		VmErrorFormat(&(*pVm), PH7_CTX_ERR, "Cannot find an entry 'Program' class");
+	}
+	pInstance = PH7_NewClassInstance(&(*pVm), pClass);
+	if(pInstance == 0) {
+		VmErrorFormat(&(*pVm), PH7_CTX_ERR, "Cannot create 'Program' instance due to a memory failure");
+	}
+	/* Check if a constructor is available */
+	pMethod = PH7_ClassExtractMethod(pClass, "__construct", sizeof("__construct") - 1);
+	if(pMethod) {
+		/* Call the class constructor */
+		PH7_VmCallClassMethod(&(*pVm), pInstance, pMethod, 0, 0, 0);
+	}
+	/* Call entry point */
+	pMethod = PH7_ClassExtractMethod(pClass, "main", sizeof("main") - 1);
+	if(!pMethod) {
+		VmErrorFormat(&(*pVm), PH7_CTX_ERR, "Cannot find a program entry point 'Program::main()'");
+	}
+	PH7_VmCallClassMethod(&(*pVm), pInstance, pMethod, 0, 0, 0);
 	/* Invoke any shutdown callbacks */
 	VmInvokeShutdownCallbacks(&(*pVm));
 	/*
@@ -7325,6 +7349,7 @@ PH7_PRIVATE sxi32 PH7_VmCallClassMethod(
 ) {
 	ph7_value *aStack;
 	VmInstr aInstr[2];
+	int iEntry;
 	int iCursor;
 	int i;
 	/* Create a new operand stack */
@@ -7344,6 +7369,7 @@ PH7_PRIVATE sxi32 PH7_VmCallClassMethod(
 		aStack[i].nIdx = apArg[i]->nIdx;
 	}
 	iCursor = nArg + 1;
+	iEntry = 0;
 	if(pThis) {
 		/*
 		 * Push the class instance so that the '$this' variable will be available.
@@ -7351,6 +7377,12 @@ PH7_PRIVATE sxi32 PH7_VmCallClassMethod(
 		pThis->iRef++; /* Increment reference count */
 		aStack[i].x.pOther = pThis;
 		aStack[i].iFlags = MEMOBJ_OBJ;
+		if(SyStrncmp(pThis->pClass->sName.zString, "Program", 7) == 0) {
+			if((SyStrncmp(pMethod->sFunc.sName.zString, "main", 4) == 0) || (SyStrncmp(pMethod->sFunc.sName.zString, "__construct", 11) == 0)) {
+				/* Do not overload entry point */
+				iEntry = 1;
+			}
+		}
 	}
 	aStack[i].nIdx = SXU32_HIGH; /* Mark as constant */
 	i++;
@@ -7362,7 +7394,7 @@ PH7_PRIVATE sxi32 PH7_VmCallClassMethod(
 	/* Emit the CALL instruction */
 	aInstr[0].iOp = PH7_OP_CALL;
 	aInstr[0].iP1 = nArg; /* Total number of given arguments */
-	aInstr[0].iP2 = 0;
+	aInstr[0].iP2 = iEntry;
 	aInstr[0].p3  = 0;
 	/* Emit the DONE instruction */
 	aInstr[1].iOp = PH7_OP_DONE;

tests/arab_to_roman.aer

@@ -1,4 +1,4 @@
-class Main {
+class Program {
 
 	private function num2Roman($num) {
 		$n = intval($num);
@@ -15,7 +15,7 @@ class Main {
 		return $result;
 	}
 
-	public function __construct() {
+	public function main() {
 		print('   7 => ' + $this->num2Roman(7) + "\n");	
 		print('   9 => ' + $this->num2Roman(9) + "\n");	
 		print('  11 => ' + $this->num2Roman(11) + "\n");	
@@ -28,5 +28,3 @@ class Main {
 	 }
 
 }
-
-new Main();

tests/debug_backtrace.aer

@@ -1,6 +1,6 @@
-class Main {
+class Program {
 
-	function __construct() {
+	function main() {
 		$this->b($this->a('First A'), $this->a('Second A'), $this->a('Third A'));
 	}
 
@@ -19,5 +19,3 @@ class Main {
 	}
 
 }
-
-new Main();

tests/hello_world.aer

@@ -1,9 +1,7 @@
-class Main {
+class Program {
 
-	public function __construct() {
+	public function main() {
 		print('Hello world!');
 	}
 
 }
-
-new Main();

tests/load_module.aer

@@ -1,9 +1,7 @@
-final class Main {
-	function __construct() {
+final class Program {
+	function main() {
 		var_dump(function_exists('dummy_function'));
 		var_dump(import('dummy'));
 		var_dump(function_exists('dummy_function'));
 	}
 }
-
-new Main();

tests/printf_test.aer

@@ -1,11 +1,11 @@
-class Main {
+class Program {
 	private $s = 'monkey';
 	private $t = 'many monkeys';
 	private $n =  43951789;
 	private $u = -43951789;
 	private $c = 65;
 
-	public function __construct() {
+	public function main() {
 		$this->testMonkey();
 		$this->testNumbers();
 	}
@@ -36,5 +36,3 @@ class Main {
 	}
 
 }
-
-new Main();

tests/singleton_test.aer

@@ -22,13 +22,11 @@ final class Test {
 	}
 }
 
-final class Main {
-	public function __construct() {
+final class Program {
+	public function main() {
 		$testA = Test::getInstance();
 		$testA->set(5);
 		$testB = Test::getInstance();
 		var_dump($testB->get());
 	}
 } /* class */
-
-new Main();

tests/type_juggle.aer

@@ -1,6 +1,6 @@
-class Main {
+class Program {
 
-	function __construct() {
+	function main() {
 		$foo = '0';
 		var_dump($foo);
 		$foo += 2;
@@ -23,5 +23,3 @@ class Main {
 		var_dump($foo);
 	}
 }
-
-new Main();

tests/unicode_characters.aer

@@ -47,13 +47,11 @@ class Unicode {
 
 }
 
-final class Main {
+final class Program {
 
-	public function __construct() {
+	public function main() {
 		$unicode = new Unicode();
 		var_dump($unicode->unicon("ИфйжБЦ"));
 	}
 
 }
-
-new Main();

tests/utf8_variables.aer

@@ -1,7 +1,7 @@
-class Main {
+class Program {
 	private $概要 = "AerScript Interpreter";
 
-	public function __construct() {
+	public function main() {
 		$this->ダウンロード();
 		var_dump($this->概要);
 		var_dump($this->isUTF8('hello'));
@@ -39,5 +39,3 @@ class Main {
 		return true;
 	}
 }
-
-new Main();