Fix win32 build.

runtime/vm/assembler.cc

 // 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.
 
 #include "vm/assembler.h"
 #include "vm/cpu.h"
 #include "vm/heap.h"
 #include "vm/memory_region.h"
+#include "vm/os.h"
 #include "vm/utils.h"
 #include "vm/zone.h"
 
 namespace dart {
 
 static uword NewContents(int capacity) {
   Zone* zone = Isolate::Current()->current_zone();
   uword result = zone->Allocate(capacity);
 #if defined(DEBUG)
   // Initialize the buffer with kBreakPointInstruction to force a break
@@ skipping 128 matching lines @@
   // the handle needs to be a zone handle.
   ASSERT(object.IsZoneHandle());
   EmitFixup(new PatchCodeWithHandle(pointer_offsets_, object));
   cursor_ += kWordSize;  // Reserve space for pointer.
 }
 
 
 // Shared macros are implemented here.
 void Assembler::Unimplemented(const char* message) {
   const char* format = "Unimplemented: %s";
-  const intptr_t len = snprintf(NULL, 0, format, message);
+  const intptr_t len = OS::SNPrint(NULL, 0, format, message);
   char* buffer = reinterpret_cast<char*>(malloc(len + 1));
-  snprintf(buffer, len + 1, format, message);
+  OS::SNPrint(buffer, len + 1, format, message);
   Stop(buffer);
 }
 
 
 void Assembler::Untested(const char* message) {
   const char* format = "Untested: %s";
-  const intptr_t len = snprintf(NULL, 0, format, message);
+  const intptr_t len = OS::SNPrint(NULL, 0, format, message);
   char* buffer = reinterpret_cast<char*>(malloc(len + 1));
-  snprintf(buffer, len + 1, format, message);
+  OS::SNPrint(buffer, len + 1, format, message);
   Stop(buffer);
 }
 
 
 void Assembler::Unreachable(const char* message) {
   const char* format = "Unreachable: %s";
-  const intptr_t len = snprintf(NULL, 0, format, message);
+  const intptr_t len = OS::SNPrint(NULL, 0, format, message);
   char* buffer = reinterpret_cast<char*>(malloc(len + 1));
-  snprintf(buffer, len + 1, format, message);
+  OS::SNPrint(buffer, len + 1, format, message);
   Stop(buffer);
 }
 
 }  // namespace dart