[date] Refactor TimezoneCache to be separate from the OS

src/base/platform/platform-macos.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Platform-specific code for MacOS goes here. For the POSIX-compatible
 // parts, the implementation is in platform-posix.cc.
 
 #include <dlfcn.h>
 #include <mach/mach_init.h>
 #include <mach-o/dyld.h>
@@ skipping 18 matching lines @@
 #include <sys/resource.h>
 #include <sys/sysctl.h>
 #include <sys/time.h>
 #include <sys/types.h>
 
 #include <cmath>
 
 #undef MAP_TYPE
 
 #include "src/base/macros.h"
+#include "src/base/platform/platform-posix.h"
 #include "src/base/platform/platform.h"
 
 
 namespace v8 {
 namespace base {
 
 
 // Constants used for mmap.
 // kMmapFd is used to pass vm_alloc flags to tag the region with the user
 // defined tag 255 This helps identify V8-allocated regions in memory analysis
@@ skipping 42 matching lines @@
     result.push_back(SharedLibraryAddress(_dyld_get_image_name(i), start,
                                           start + size, slide));
   }
   return result;
 }
 
 
 void OS::SignalCodeMovingGC() {
 }
 
-
-const char* OS::LocalTimezone(double time, TimezoneCache* cache) {
-  if (std::isnan(time)) return "";
-  time_t tv = static_cast<time_t>(std::floor(time/msPerSecond));
-  struct tm tm;
-  struct tm* t = localtime_r(&tv, &tm);
-  if (NULL == t) return "";
-  return t->tm_zone;
-}
-
-
-double OS::LocalTimeOffset(TimezoneCache* cache) {
-  time_t tv = time(NULL);
-  struct tm tm;
-  struct tm* t = localtime_r(&tv, &tm);
-  // tm_gmtoff includes any daylight savings offset, so subtract it.
-  return static_cast<double>(t->tm_gmtoff * msPerSecond -
-                             (t->tm_isdst > 0 ? 3600 * msPerSecond : 0));
-}
-
+TimezoneCache* OS::CreateTimezoneCache() { return new PosixTimezoneCache(); }
 
 VirtualMemory::VirtualMemory() : address_(NULL), size_(0) { }
 
 
 VirtualMemory::VirtualMemory(size_t size)
     : address_(ReserveRegion(size)), size_(size) { }
 
 
 VirtualMemory::VirtualMemory(size_t size, size_t alignment)
     : address_(NULL), size_(0) {
@@ skipping 116 matching lines @@
 }
 
 bool VirtualMemory::ReleaseRegion(void* address, size_t size) {
   return munmap(address, size) == 0;
 }
 
 bool VirtualMemory::HasLazyCommits() { return true; }
 
 }  // namespace base
 }  // namespace v8