Move platform abstraction to base library

src/globals.h

 // 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.
 
 #ifndef V8_GLOBALS_H_
 #define V8_GLOBALS_H_
 
 #include "include/v8stdint.h"
 
 #include "src/base/build_config.h"
+#include "src/base/logging.h"
 #include "src/base/macros.h"
-#include "src/checks.h"
 
 // Unfortunately, the INFINITY macro cannot be used with the '-pedantic'
 // warning flag and certain versions of GCC due to a bug:
 // http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11931
 // For now, we use the more involved template-based version from <limits>, but
 // only when compiling with GCC versions affected by the bug (2.96.x - 4.0.x)
 #if V8_CC_GNU && V8_GNUC_PREREQ(2, 96, 0) && !V8_GNUC_PREREQ(4, 1, 0)
 # include <limits>  // NOLINT
 # define V8_INFINITY std::numeric_limits<double>::infinity()
 #elif V8_LIBC_MSVCRT
 # define V8_INFINITY HUGE_VAL
 #else
 # define V8_INFINITY INFINITY
 #endif
 
 namespace v8 {
+
+namespace base {
+class Mutex;
+class RecursiveMutex;
+class VirtualMemory;
+}
+
 namespace internal {
 
 // Determine whether we are running in a simulated environment.
 // Setting USE_SIMULATOR explicitly from the build script will force
 // the use of a simulated environment.
 #if !defined(USE_SIMULATOR)
 #if (V8_TARGET_ARCH_ARM64 && !V8_HOST_ARCH_ARM64)
 #define USE_SIMULATOR 1
 #endif
 #if (V8_TARGET_ARCH_ARM && !V8_HOST_ARCH_ARM)
@@ skipping 193 matching lines @@
 const Address kHandleZapValue = reinterpret_cast<Address>(0xbaddeaf);
 const Address kGlobalHandleZapValue = reinterpret_cast<Address>(0xbaffedf);
 const Address kFromSpaceZapValue = reinterpret_cast<Address>(0xbeefdaf);
 const uint32_t kSlotsZapValue = 0xbeefdeef;
 const uint32_t kDebugZapValue = 0xbadbaddb;
 const uint32_t kFreeListZapValue = 0xfeed1eaf;
 #endif
 
 const int kCodeZapValue = 0xbadc0de;
 
-// Number of bits to represent the page size for paged spaces. The value of 20
-// gives 1Mb bytes per page.
-const int kPageSizeBits = 20;
-
 // On Intel architecture, cache line size is 64 bytes.
 // On ARM it may be less (32 bytes), but as far this constant is
 // used for aligning data, it doesn't hurt to align on a greater value.
 #define PROCESSOR_CACHE_LINE_SIZE 64
 
 // Constants relevant to double precision floating point numbers.
 // If looking only at the top 32 bits, the QNaN mask is bits 19 to 30.
 const uint32_t kQuietNaNHighBitsMask = 0xfff << (51 - 32);
 
 
@@ skipping 48 matching lines @@
 class Smi;
 template <typename Config, class Allocator = FreeStoreAllocationPolicy>
     class SplayTree;
 class String;
 class Name;
 class Struct;
 class Variable;
 class RelocInfo;
 class Deserializer;
 class MessageLocation;
-class VirtualMemory;
-class Mutex;
-class RecursiveMutex;
 
 typedef bool (*WeakSlotCallback)(Object** pointer);
 
 typedef bool (*WeakSlotCallbackWithHeap)(Heap* heap, Object** pointer);
 
 // -----------------------------------------------------------------------------
 // Miscellaneous
 
 // NOTE: SpaceIterator depends on AllocationSpace enumeration values being
 // consecutive.
@@ skipping 395 matching lines @@
 enum MinusZeroMode {
   TREAT_MINUS_ZERO_AS_ZERO,
   FAIL_ON_MINUS_ZERO
 };
 
 } }  // namespace v8::internal
 
 namespace i = v8::internal;
 
 #endif  // V8_GLOBALS_H_