Implement async file API on top of isolates.

runtime/bin/file.cc

 // Copyright (c) 2011, 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 "bin/file.h"
 
 #include "bin/builtin.h"
 #include "bin/dartutils.h"
 
 #include "include/dart_api.h"
@@ skipping 22 matching lines @@
     if (bytes_read < 0) {
       return false;
     }
     remaining -= bytes_read;  // Reduce the number of remaining bytes.
     current_buffer += bytes_read;  // Move the buffer forward.
   }
   return true;
 }
 
 
-static File* GetFileHandle(Dart_Handle fileobj) {
-  intptr_t value =
-      DartUtils::GetIntegerInstanceField(fileobj, DartUtils::kIdFieldName);
-  File* file = reinterpret_cast<File*>(value);
-  return file;
-}
-
-
-void FUNCTION_NAME(File_OpenFile)(Dart_NativeArguments args) {
+void FUNCTION_NAME(File_Open)(Dart_NativeArguments args) {
   Dart_EnterScope();
-  Dart_Handle fileobj = Dart_GetNativeArgument(args, 0);
   const char* filename =
-      DartUtils::GetStringValue(Dart_GetNativeArgument(args, 1));
-  bool writable = DartUtils::GetBooleanValue(Dart_GetNativeArgument(args, 2));
+      DartUtils::GetStringValue(Dart_GetNativeArgument(args, 0));
+  bool writable = DartUtils::GetBooleanValue(Dart_GetNativeArgument(args, 1));
   File* file = File::OpenFile(filename, writable);
-  DartUtils::SetIntegerInstanceField(fileobj,
-                                     DartUtils::kIdFieldName,
-                                     reinterpret_cast<intptr_t>(file));
-  Dart_SetReturnValue(args, Dart_NewBoolean(file != NULL));
+  Dart_SetReturnValue(args, Dart_NewInteger(reinterpret_cast<intptr_t>(file)));
   Dart_ExitScope();
 }
 
 
 void FUNCTION_NAME(File_Exists)(Dart_NativeArguments args) {
   Dart_EnterScope();
   const char* filename =
-      DartUtils::GetStringValue(Dart_GetNativeArgument(args, 1));
+      DartUtils::GetStringValue(Dart_GetNativeArgument(args, 0));
   bool exists = File::FileExists(filename);
   Dart_SetReturnValue(args, Dart_NewBoolean(exists));
   Dart_ExitScope();
 }
 
 
 void FUNCTION_NAME(File_Close)(Dart_NativeArguments args) {
   Dart_EnterScope();
   intptr_t return_value = -1;
-  Dart_Handle fileobj = Dart_GetNativeArgument(args, 0);
-  File* file = GetFileHandle(fileobj);
+  intptr_t value =
+      DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 0));
+  File* file = reinterpret_cast<File*>(value);
   if (file != NULL) {
-    DartUtils::SetIntegerInstanceField(fileobj, DartUtils::kIdFieldName, 0);
     delete file;
     return_value = 0;
   }
   Dart_SetReturnValue(args, Dart_NewInteger(return_value));
   Dart_ExitScope();
 }
 
 
 void FUNCTION_NAME(File_ReadByte)(Dart_NativeArguments args) {
   Dart_EnterScope();
   intptr_t return_value = -1;
-  File* file = GetFileHandle(Dart_GetNativeArgument(args, 0));
+  intptr_t value =
+      DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 0));
+  File* file = reinterpret_cast<File*>(value);
   if (file != NULL) {
     uint8_t buffer;
     int bytes_read = file->Read(reinterpret_cast<void*>(&buffer), 1);
     if (bytes_read >= 0) {
       return_value = static_cast<intptr_t>(buffer);
     }
   }
   Dart_SetReturnValue(args, Dart_NewInteger(return_value));
   Dart_ExitScope();
 }
 
 
 void FUNCTION_NAME(File_WriteByte)(Dart_NativeArguments args) {
   Dart_EnterScope();
   intptr_t return_value = -1;
-  File* file = GetFileHandle(Dart_GetNativeArgument(args, 0));
+  intptr_t value =
+      DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 0));
+  File* file = reinterpret_cast<File*>(value);
   if (file != NULL) {
     int64_t value = DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 1));
     uint8_t buffer = static_cast<uint8_t>(value & 0xff);
     int bytes_written = file->Write(reinterpret_cast<void*>(&buffer), 1);
     if (bytes_written >= 0) {
       return_value = bytes_written;
     }
   }
   Dart_SetReturnValue(args, Dart_NewInteger(return_value));
   Dart_ExitScope();
 }
 
 
 void FUNCTION_NAME(File_WriteString)(Dart_NativeArguments args) {
   Dart_EnterScope();
   intptr_t return_value = -1;
-  File* file = GetFileHandle(Dart_GetNativeArgument(args, 0));
+  intptr_t value =
+      DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 0));
+  File* file = reinterpret_cast<File*>(value);
   if (file != NULL) {
     const char* str =
         DartUtils::GetStringValue(Dart_GetNativeArgument(args, 1));
     int bytes_written = file->Write(reinterpret_cast<const void*>(str),
                                     strlen(str));
     if (bytes_written >= 0) {
       return_value = bytes_written;
     }
   }
   Dart_SetReturnValue(args, Dart_NewInteger(return_value));
   Dart_ExitScope();
 }
 
 
 void FUNCTION_NAME(File_ReadList)(Dart_NativeArguments args) {
   Dart_EnterScope();
   intptr_t return_value = -1;
-  File* file = GetFileHandle(Dart_GetNativeArgument(args, 0));
+  intptr_t value =
+      DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 0));
+  File* file = reinterpret_cast<File*>(value);
   if (file != NULL) {
     Dart_Handle buffer_obj = Dart_GetNativeArgument(args, 1);
     ASSERT(Dart_IsArray(buffer_obj));
     int64_t offset =
         DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 2));
     int64_t length =
         DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 3));
     intptr_t array_len = 0;
     Dart_Handle result = Dart_GetLength(buffer_obj, &array_len);
     ASSERT(Dart_IsValid(result));
@@ skipping 13 matching lines @@
     delete[] buffer;
   }
   Dart_SetReturnValue(args, Dart_NewInteger(return_value));
   Dart_ExitScope();
 }
 
 
 void FUNCTION_NAME(File_WriteList)(Dart_NativeArguments args) {
   Dart_EnterScope();
   intptr_t return_value = -1;
-  File* file = GetFileHandle(Dart_GetNativeArgument(args, 0));
+  intptr_t value =
+      DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 0));
+  File* file = reinterpret_cast<File*>(value);
   if (file != NULL) {
     Dart_Handle buffer_obj = Dart_GetNativeArgument(args, 1);
     ASSERT(Dart_IsArray(buffer_obj));
     int64_t offset =
         DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 2));
     int64_t length =
         DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 3));
     intptr_t buffer_len = 0;
     Dart_Handle result = Dart_GetLength(buffer_obj, &buffer_len);
     ASSERT(Dart_IsValid(result));
     ASSERT((offset + length) <= buffer_len);
     uint8_t* buffer = new uint8_t[length];
     result = Dart_ArrayGet(buffer_obj, offset, buffer, length);
     ASSERT(Dart_IsValid(result));
     int total_bytes_written =
         file->Write(reinterpret_cast<void*>(buffer), length);
     if (total_bytes_written >= 0) {
       return_value = total_bytes_written;
     }
     delete[] buffer;
   }
   Dart_SetReturnValue(args, Dart_NewInteger(return_value));
   Dart_ExitScope();
 }
 
 
 void FUNCTION_NAME(File_Position)(Dart_NativeArguments args) {
   Dart_EnterScope();
   intptr_t return_value = -1;
-  File* file = GetFileHandle(Dart_GetNativeArgument(args, 0));
+  intptr_t value =
+      DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 0));
+  File* file = reinterpret_cast<File*>(value);
   if (file != NULL) {
     return_value = file->Position();
   }
   Dart_SetReturnValue(args, Dart_NewInteger(return_value));
   Dart_ExitScope();
 }
 
 
 void FUNCTION_NAME(File_Length)(Dart_NativeArguments args) {
   Dart_EnterScope();
   intptr_t return_value = -1;
-  File* file = GetFileHandle(Dart_GetNativeArgument(args, 0));
+  intptr_t value =
+      DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 0));
+  File* file = reinterpret_cast<File*>(value);
   if (file != NULL) {
     return_value = file->Length();
   }
   Dart_SetReturnValue(args, Dart_NewInteger(return_value));
   Dart_ExitScope();
 }
 
 
 void FUNCTION_NAME(File_Flush)(Dart_NativeArguments args) {
   Dart_EnterScope();
   intptr_t return_value = -1;
-  File* file = GetFileHandle(Dart_GetNativeArgument(args, 0));
+  intptr_t value =
+      DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 0));
+  File* file = reinterpret_cast<File*>(value);
   if (file != NULL) {
     file->Flush();
     return_value = 0;
   }
   Dart_SetReturnValue(args, Dart_NewInteger(return_value));
   Dart_ExitScope();
 }