Reland of land "Turn libbase into a component"

src/base/platform/platform.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.
 
 // This module contains the platform-specific code. This make the rest of the
 // code less dependent on operating system, compilers and runtime libraries.
 // This module does specifically not deal with differences between different
 // processor architecture.
 // The platform classes have the same definition for all platforms. The
 // implementation for a particular platform is put in platform_<os>.cc.
 // The build system then uses the implementation for the target platform.
 //
 // This design has been chosen because it is simple and fast. Alternatively,
 // the platform dependent classes could have been implemented using abstract
 // superclasses with virtual methods and having specializations for each
 // platform. This design was rejected because it was more complicated and
 // slower. It would require factory methods for selecting the right
 // implementation and the overhead of virtual methods for performance
 // sensitive like mutex locking/unlocking.
 
 #ifndef V8_BASE_PLATFORM_PLATFORM_H_
 #define V8_BASE_PLATFORM_PLATFORM_H_
 
 #include <cstdarg>
 #include <string>
 #include <vector>
 
+#include "src/base/base-export.h"
 #include "src/base/build_config.h"
 #include "src/base/compiler-specific.h"
 #include "src/base/platform/mutex.h"
 #include "src/base/platform/semaphore.h"
 
 #if V8_OS_QNX
 #include "src/base/qnx-math.h"
 #endif
 
 namespace v8 {
@@ skipping 24 matching lines @@
   intptr_t extra = static_cast<intptr_t>(__readfsdword(kTibExtraTlsOffset));
   DCHECK(extra != 0);
   return *reinterpret_cast<intptr_t*>(extra +
                                       kPointerSize * (index - kMaxInlineSlots));
 }
 
 #elif defined(__APPLE__) && (V8_HOST_ARCH_IA32 || V8_HOST_ARCH_X64)
 
 #define V8_FAST_TLS_SUPPORTED 1
 
-extern intptr_t kMacTlsBaseOffset;
+extern V8_BASE_EXPORT intptr_t kMacTlsBaseOffset;
 
 INLINE(intptr_t InternalGetExistingThreadLocal(intptr_t index));
 
 inline intptr_t InternalGetExistingThreadLocal(intptr_t index) {
   intptr_t result;
 #if V8_HOST_ARCH_IA32
   asm("movl %%gs:(%1,%2,4), %0;"
       :"=r"(result)  // Output must be a writable register.
       :"r"(kMacTlsBaseOffset), "r"(index));
 #else
@@ skipping 12 matching lines @@
 class TimezoneCache;
 
 
 // ----------------------------------------------------------------------------
 // OS
 //
 // This class has static methods for the different platform specific
 // functions. Add methods here to cope with differences between the
 // supported platforms.
 
-class OS {
+class V8_BASE_EXPORT OS {
  public:
   // Initialize the OS class.
   // - random_seed: Used for the GetRandomMmapAddress() if non-zero.
   // - hard_abort: If true, OS::Abort() will crash instead of aborting.
   // - gc_fake_mmap: Name of the file for fake gc mmap used in ll_prof.
   static void Initialize(int64_t random_seed,
                          bool hard_abort,
                          const char* const gc_fake_mmap);
 
   // Returns the accumulated user time for thread. This routine
@@ skipping 88 matching lines @@
 
   // Walk the stack.
   static const int kStackWalkError = -1;
   static const int kStackWalkMaxNameLen = 256;
   static const int kStackWalkMaxTextLen = 256;
   struct StackFrame {
     void* address;
     char text[kStackWalkMaxTextLen];
   };
 
-  class MemoryMappedFile {
+  class V8_BASE_EXPORT MemoryMappedFile {
    public:
     virtual ~MemoryMappedFile() {}
     virtual void* memory() const = 0;
     virtual size_t size() const = 0;
 
     static MemoryMappedFile* open(const char* name);
     static MemoryMappedFile* create(const char* name, size_t size,
                                     void* initial);
   };
 
@@ skipping 54 matching lines @@
 #endif
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(OS);
 };
 
 
 // Represents and controls an area of reserved memory.
 // Control of the reserved memory can be assigned to another VirtualMemory
 // object by assignment or copy-contructing. This removes the reserved memory
 // from the original object.
-class VirtualMemory {
+class V8_BASE_EXPORT VirtualMemory {
  public:
   // Empty VirtualMemory object, controlling no reserved memory.
   VirtualMemory();
 
   // Reserves virtual memory with size.
   explicit VirtualMemory(size_t size);
 
   // Reserves virtual memory containing an area of the given size that
   // is aligned per alignment. This may not be at the position returned
   // by address().
@@ skipping 111 matching lines @@
 
 
 // ----------------------------------------------------------------------------
 // Thread
 //
 // Thread objects are used for creating and running threads. When the start()
 // method is called the new thread starts running the run() method in the new
 // thread. The Thread object should not be deallocated before the thread has
 // terminated.
 
-class Thread {
+class V8_BASE_EXPORT Thread {
  public:
   // Opaque data type for thread-local storage keys.
   typedef int32_t LocalStorageKey;
 
   class Options {
    public:
     Options() : name_("v8:<unknown>"), stack_size_(0) {}
     explicit Options(const char* name, int stack_size = 0)
         : name_(name), stack_size_(stack_size) {}
 
@@ skipping 80 matching lines @@
   int stack_size_;
   Semaphore* start_semaphore_;
 
   DISALLOW_COPY_AND_ASSIGN(Thread);
 };
 
 }  // namespace base
 }  // namespace v8
 
 #endif  // V8_BASE_PLATFORM_PLATFORM_H_