Introducing MemoryMappedExternalResource for creating an external...

src/platform-win32.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 652 matching lines @@
 FILE* OS::FOpen(const char* path, const char* mode) {
   FILE* result;
   if (fopen_s(&result, path, mode) == 0) {
     return result;
   } else {
     return NULL;
   }
 }
 
 
+bool OS::Remove(const char* path) {
+  return (DeleteFile(path) != 0);
+}
+
+
 // Open log file in binary mode to avoid /n -> /r/n conversion.
 const char* OS::LogFileOpenMode = "wb";
 
 
 // Print (debug) message to console.
 void OS::Print(const char* format, ...) {
   va_list args;
   va_start(args, format);
   VPrint(format, args);
   va_end(args);
@@ skipping 221 matching lines @@
 #ifdef _MSC_VER
   __debugbreak();
 #else
   ::DebugBreak();
 #endif
 }
 
 
 class Win32MemoryMappedFile : public OS::MemoryMappedFile {
  public:
-  Win32MemoryMappedFile(HANDLE file, HANDLE file_mapping, void* memory)
-    : file_(file), file_mapping_(file_mapping), memory_(memory) { }
+  Win32MemoryMappedFile(HANDLE file,
+                        HANDLE file_mapping,
+                        void* memory,
+                        int size)
+      : file_(file),
+        file_mapping_(file_mapping),
+        memory_(memory),
+        size_(size) { }
   virtual ~Win32MemoryMappedFile();
   virtual void* memory() { return memory_; }
+  virtual void* size() { return size_; }
  private:
   HANDLE file_;
   HANDLE file_mapping_;
   void* memory_;
+  int size_;
 };
 
 
+OS::MemoryMappedFile* OS::MemoryMappedFile::open(const char* name) {
+  // Open a physical file
+  HANDLE file = CreateFileA(name, GENERIC_READ | GENERIC_WRITE,
+      FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);
+  if (file == NULL) return NULL;
+
+  int size = static_cast<int>(GetFileSize(file, NULL));
+
+  // Create a file mapping for the physical file
+  HANDLE file_mapping = CreateFileMapping(file, NULL,
+      PAGE_READWRITE, 0, static_cast<DWORD>(size), NULL);
+  if (file_mapping == NULL) return NULL;
+
+  // Map a view of the file into memory
+  void* memory = MapViewOfFile(file_mapping, FILE_MAP_ALL_ACCESS, 0, 0, size);
+  return new Win32MemoryMappedFile(file, file_mapping, memory, size);
+}
+
+
 OS::MemoryMappedFile* OS::MemoryMappedFile::create(const char* name, int size,
     void* initial) {
   // Open a physical file
   HANDLE file = CreateFileA(name, GENERIC_READ | GENERIC_WRITE,
       FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_ALWAYS, 0, NULL);
   if (file == NULL) return NULL;
   // Create a file mapping for the physical file
   HANDLE file_mapping = CreateFileMapping(file, NULL,
       PAGE_READWRITE, 0, static_cast<DWORD>(size), NULL);
   if (file_mapping == NULL) return NULL;
   // Map a view of the file into memory
   void* memory = MapViewOfFile(file_mapping, FILE_MAP_ALL_ACCESS, 0, 0, size);
   if (memory) memmove(memory, initial, size);
-  return new Win32MemoryMappedFile(file, file_mapping, memory);
+  return new Win32MemoryMappedFile(file, file_mapping, memory, size);
 }
 
 
 Win32MemoryMappedFile::~Win32MemoryMappedFile() {
   if (memory_ != NULL)
     UnmapViewOfFile(memory_);
   CloseHandle(file_mapping_);
   CloseHandle(file_);
 }
 
@@ skipping 984 matching lines @@
 
   // Release the thread handles
   CloseHandle(data_->sampler_thread_);
   CloseHandle(data_->profiled_thread_);
 }
 
 
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 } }  // namespace v8::internal