Initial revision of ARM simulator and (empty) MIPS simulator.

runtime/vm/os.h

 // Copyright (c) 2011, 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_OS_H_
 #define VM_OS_H_
 
 #include "vm/globals.h"
 
 // Forward declarations.
@@ skipping 60 matching lines @@
 
   // Returns the stack size limit.
   static uword GetStackSizeLimit();
 
   // Returns number of available processor cores.
   static int NumberOfAvailableProcessors();
 
   // Sleep the currently executing thread for millis ms.
   static void Sleep(int64_t millis);
 
+  // Debug break.
+  static void DebugBreak();
+
+  static uword NullPageSize() { return null_page_size_; }

[Ivan Posva, 2013/01/24 18:25:57]

I am not sure what we need this for.

[regis, 2013/01/24 21:47:48]

Good point. Since we do not install handlers for segmentation violations, the
simulator can implement null checks independently of the actual page size.
Removed.

+  static bool IsInsideNullPage(intptr_t offset) {
+    return static_cast<uword>(offset) < null_page_size_;
+  }
+
   // Print formatted output to stdout/stderr for debugging.
   static void Print(const char* format, ...) PRINTF_ATTRIBUTE(1, 2);
   static void PrintErr(const char* format, ...) PRINTF_ATTRIBUTE(1, 2);
   static void VFPrint(FILE* stream, const char* format, va_list args);
   // Print formatted output info a buffer.
   //
   // Does not write more than size characters (including the trailing '\0').
   //
   // Returns the number of characters (excluding the trailing '\0')
   // that would been written if the buffer had been big enough.  If
@@ skipping 26 matching lines @@
 
   // Initialize the OS class.
   static void InitOnce();
 
   // Shut down the OS class.
   static void Shutdown();
 
   static void Abort();
 
   static void Exit(int code);
+
+ private:
+  // Cache the null page size.
+  static uword null_page_size_;
 };
 
 }  // namespace dart
 
 #endif  // VM_OS_H_