Fix segfault when zero args passed to V8\FunctionObject::NewInstance()

Author: pinepain

Diff for: src/php_v8_function.cc

@@ -345,7 +345,7 @@ static PHP_METHOD(V8Function, __construct) {
 
 static PHP_METHOD(V8Function, NewInstance) {
     zval *php_v8_context_zv;
-    zval* arguments_zv;
+    zval *arguments_zv = NULL;
 
     int argc = 0;
     v8::Local<v8::Value> *argv = NULL;
@@ -388,7 +388,7 @@ static PHP_METHOD(V8Function, NewInstance) {
 
 static PHP_METHOD(V8Function, Call) {
     zval *php_v8_context_zv;
-    zval *php_v8_recv_zv = NULL;
+    zval *php_v8_recv_zv;
     zval *arguments_zv = NULL;
 
     int argc = 0;

Diff for: tests/V8FunctionObject_NewInstance.phpt

@@ -0,0 +1,41 @@
+--TEST--
+V8\FunctionObject::NewInstance()
+--SKIPIF--
+<?php if (!extension_loaded("v8")) {
+    print "skip";
+} ?>
+--FILE--
+<?php
+/** @var \Phpv8Testsuite $helper */
+$helper = require '.testsuite.php';
+
+require '.v8-helpers.php';
+$v8_helper = new PhpV8Helpers($helper);
+
+
+// Tests:
+
+$isolate = new \V8\Isolate();
+$context = new \V8\Context($isolate);
+
+$global=  $context->GlobalObject();
+
+
+$tpl = new \V8\FunctionTemplate($isolate, function (\V8\FunctionCallbackInfo $args) {
+    echo 'called as ', $args->IsConstructCall() ? 'constructor' : 'function', ' ';
+    echo 'with ', count($args->Arguments()), ' arguments';
+
+    echo PHP_EOL;
+});
+
+
+$tpl->GetFunction($context)->NewInstance($context);
+$tpl->GetFunction($context)->NewInstance($context, [new \V8\StringValue($isolate, 'argument1')]);
+$tpl->GetFunction($context)->NewInstance($context, [new \V8\ObjectValue($context)]);
+
+
+?>
+--EXPECT--
+called as constructor with 0 arguments
+called as constructor with 1 arguments
+called as constructor with 1 arguments

Diff for: tests/V8ObjectTemplate_SetHandlerForNamedProperty.phpt

@@ -27,7 +27,7 @@ $getter = function (\V8\NameValue $name, \V8\PropertyCallbackInfo $info) use (&$
     $info->GetReturnValue()->Set(new \V8\NumberValue($info->GetIsolate(), $foo));
 };
 
-$setter = function (\V8\NameValue$name, \V8\Value $value, \V8\PropertyCallbackInfo $info) use (&$foo) {
+$setter = function (\V8\NameValue $name, \V8\Value $value, \V8\PropertyCallbackInfo $info) use (&$foo) {
     echo 'I am named setter for ', $name->ToString($info->GetContext())->Value(), '!', PHP_EOL;
 
     $foo = $value->ToNumber($info->GetContext())->Value() / 2;