Added stack overflow checks at backward branches in order to allow interrupting endless loops. Bett…

runtime/vm/dart_api_impl_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
 #include "vm/class_finalizer.h"
 #include "vm/dart_api_impl.h"
 #include "vm/dart_api_state.h"
@@ skipping 3583 matching lines @@
 }
 
 
 static Dart_NativeFunction IsolateInterruptTestNativeLookup(
     Dart_Handle name, int argument_count) {
   return reinterpret_cast<Dart_NativeFunction>(&MarkMainEntered);
 }
 
 
 void BusyLoop_start(uword unused) {
-  // TODO(turnidge): Get rid of call to 'function' after interrupts
-  // are checked on backward branches.
   const char* kScriptChars =
       "class Native {\n"
       "  static void markMainEntered() native 'MarkMainEntered';\n"
       "}\n"
-      "void function([foo='hi']) {\n"
-      "}\n"
       "\n"
       "void main() {\n"
       "  Native.markMainEntered();\n"
-      "  while (true) {\n"  // Infinite loop.
-      "    function();\n"
+      "  while (true) {\n"  // Infinite empty loop.
       "  }\n"
       "}\n";
 
-
   // Tell the other thread that shared_isolate is created.
   Dart_Handle lib;
   {
     sync->Enter();
     char* error = NULL;
     shared_isolate = Dart_CreateIsolate(NULL, NULL, NULL, &error);
     EXPECT(shared_isolate != NULL);
     Dart_EnterScope();
     Dart_Handle url = Dart_NewString(TestCase::url());
     Dart_Handle source = Dart_NewString(kScriptChars);
@@ skipping 102 matching lines @@
   // We should have received the expected number of interrupts.
   EXPECT_EQ(kInterruptCount, interrupt_count);
 
   // Give the spawned thread enough time to properly exit.
   Isolate::SetInterruptCallback(saved);
 }
 
 #endif  // defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64).
 
 }  // namespace dart