Fix issue 1968, replace usage of inline 'asm' constructs in 'stack alignment', 'jump to exception h…

vm/native_arguments.h

 // 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.
 
 #ifndef VM_NATIVE_ARGUMENTS_H_
 #define VM_NATIVE_ARGUMENTS_H_
 
 #include "platform/assert.h"
 #include "vm/globals.h"
+#include "vm/stub_code.h"
 
 namespace dart {
 
 // Forward declarations.
 class Isolate;
 class Object;
 class RawObject;
 
 
+#if defined(TESTING) || defined(DEBUG)
+
+#if defined(TARGET_OS_WINDOWS)
+// The compiler may dynamically align the stack on Windows, so do not check.
+#define CHECK_STACK_ALIGNMENT { }
+#else
+#define CHECK_STACK_ALIGNMENT {                                                \
+  uword (*func)() =                                                            \
+      reinterpret_cast<uword (*)()>(StubCode::GetStackPointerEntryPoint());    \
+  uword current_sp = func();                                                   \
+  ASSERT((OS::ActivationFrameAlignment() == 0) ||                              \
+         (Utils::IsAligned(current_sp, OS::ActivationFrameAlignment())));      \
+}
+#endif
+
+#else
+
+#define CHECK_STACK_ALIGNMENT { }
+
+#endif
+
+
 // Class NativeArguments is used to access arguments passed in from
 // generated dart code to a runtime function or a dart library native
 // function. It is also used to set the return value if any at the slot
 // reserved for return values.
 // All runtime function/dart library native functions have the
 // following signature:
 //   void function_name(NativeArguments arguments);
 // Inside the function, arguments are accessed as follows:
 //   const Type& arg1 = Type::CheckedHandle(arguments.GetArgument(0));
 //   const Type& arg2 = Type::CheckedHandle(arguments.GetArgument(1));
@@ skipping 26 matching lines @@
  private:
   Isolate* isolate_;  // Current isolate pointer.
   int argc_;  // Number of arguments passed to the runtime call.
   RawObject*(*argv_)[];  // Pointer to an array of arguments to runtime call.
   RawObject** retval_;  // Pointer to the return value area.
 };
 
 }  // namespace dart
 
 #endif  // VM_NATIVE_ARGUMENTS_H_