Fuchsia: Memory reservation and partial unmapping

runtime/vm/virtual_memory_win.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 "vm/globals.h"
 #if defined(TARGET_OS_WINDOWS)
 
 #include "vm/virtual_memory.h"
 
 #include "platform/assert.h"
@@ skipping 26 matching lines @@
 VirtualMemory::~VirtualMemory() {
   if (embedder_allocated() || (reserved_size_ == 0)) {
     return;
   }
   if (VirtualFree(address(), 0, MEM_RELEASE) == 0) {
     FATAL("VirtualFree failed");
   }
 }
 
 
-bool VirtualMemory::FreeSubSegment(void* address, intptr_t size) {
+bool VirtualMemory::FreeSubSegment(int32_t handle,
+                                   void* address,
+                                   intptr_t size) {
   // On Windows only the entire segment returned by VirtualAlloc
   // can be freed. Therefore we will have to waste these unused
   // virtual memory sub-segments.
   return false;
 }
 
 
 bool VirtualMemory::Commit(uword addr, intptr_t size, bool executable) {
   ASSERT(Contains(addr));
   ASSERT(Contains(addr + size) || (addr + size == end()));
@@ skipping 32 matching lines @@
   }
   DWORD old_prot = 0;
   bool result = VirtualProtect(reinterpret_cast<void*>(page_address),
                                end_address - page_address, prot, &old_prot);
   return result;
 }
 
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_WINDOWS)