Port async file operations to be using native ports instead or an isolate

runtime/bin/file.cc

Index: runtime/bin/file.cc
diff --git a/runtime/bin/file.cc b/runtime/bin/file.cc
index 62510de21c38919972f8cc10663979ccbc2e825d..7cbf4db7f6dfec3934242118c844df6b48f86ea1 100644
--- a/runtime/bin/file.cc
+++ b/runtime/bin/file.cc
@@ -40,25 +40,28 @@ bool File::WriteFully(const void* buffer, int64_t num_bytes) {
 }
 
 
-void FUNCTION_NAME(File_Open)(Dart_NativeArguments args) {
-  // These values have to be kept in sync with the mode values of
-  // FileMode.READ, FileMode.WRITE and FileMode.APPEND in file.dart.
-  static const int kRead = 0;
-  static const int kWrite = 1;
-  static const int kAppend = 2;
+File::FileOpenMode File::DartModeToFileMode(DartFileOpenMode mode) {
+  ASSERT(mode == File::kDartRead ||
+         mode == File::kDartWrite ||
+         mode == File::kDartAppend);
+  if (mode == File::kDartWrite) {
+    return File::kWriteTruncate;
+  }
+  if (mode == File::kDartAppend) {
+    return File::kWrite;
+  }
+  return File::kRead;
+}
 
+
+void FUNCTION_NAME(File_Open)(Dart_NativeArguments args) {
   Dart_EnterScope();
   const char* filename =
       DartUtils::GetStringValue(Dart_GetNativeArgument(args, 0));
   int mode = DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 1));
-  ASSERT(mode == kRead || mode == kWrite || mode == kAppend);
-  File::FileOpenMode file_mode = File::kRead;
-  if (mode == kWrite) {
-    file_mode = File::kWriteTruncate;
-  }
-  if (mode == kAppend) {
-    file_mode = File::kWrite;
-  }
+  File::DartFileOpenMode dart_file_mode =
+      static_cast<File::DartFileOpenMode>(mode);
+  File::FileOpenMode file_mode = File::DartModeToFileMode(dart_file_mode);
   // Check that the file exists before opening it only for
   // reading. This is to prevent the opening of directories as
   // files. Directories can be opened for reading using the posix
@@ -364,3 +367,375 @@ void FUNCTION_NAME(File_GetStdioHandleType)(Dart_NativeArguments args) {
   Dart_SetReturnValue(args, Dart_NewInteger(type));
   Dart_ExitScope();
 }
+
+
+static int64_t CObjectInt32OrInt64ToInt64(CObject* cobject) {
+  ASSERT(cobject->IsInt32OrInt64());
+  int64_t result;
+  if (cobject->IsInt32()) {
+    CObjectInt32 value(cobject);
+    result = value.Value();
+  } else {
+    CObjectInt64 value(cobject);
+    result = value.Value();
+  }
+  return result;
+}
+
+
+File* CObjectToFilePointer(CObject* cobject) {
+  CObjectIntptr value(cobject);
+  return reinterpret_cast<File*>(value.Value());
+}
+
+
+static CObject* FileExistsRequest(const CObjectArray& request) {
+  if (request.Length() == 2 && request[1]->IsString()) {
+    CObjectString filename(request[1]);
+    bool result = File::Exists(filename.CString());
+    return CObject::Bool(result);
+  }
+  return CObject::False();
+}
+
+
+static CObject* FileCreateRequest(const CObjectArray& request) {
+  if (request.Length() == 2 && request[1]->IsString()) {
+    CObjectString filename(request[1]);
+    bool result = File::Create(filename.CString());
+    return CObject::Bool(result);
+  }
+  return CObject::False();
+}
+
+
+static CObject* FileOpenRequest(const CObjectArray& request) {
+  File* file = NULL;
+  if (request.Length() == 3 &&
+      request[1]->IsString() &&
+      request[2]->IsInt32()) {
+    CObjectString filename(request[1]);
+    CObjectInt32 mode(request[2]);
+    File::DartFileOpenMode dart_file_mode =
+        static_cast<File::DartFileOpenMode>(mode.Value());
+    File::FileOpenMode file_mode = File::DartModeToFileMode(dart_file_mode);
+    if (((file_mode & File::kWrite) != 0) || File::Exists(filename.CString())) {
+      file = File::Open(filename.CString(), file_mode);
+    }
+  }
+  return new CObjectIntptr(
+      CObject::NewIntptr(reinterpret_cast<intptr_t>(file)));
+}
+
+
+static CObject* FileDeleteRequest(const CObjectArray& request) {
+  if (request.Length() == 2 && request[1]->IsString()) {
+    CObjectString filename(request[1]);
+    bool result = File::Delete(filename.CString());
+    return CObject::Bool(result);
+  }
+  return CObject::False();
+}
+
+
+static CObject* FileFullPathRequest(const CObjectArray& request) {
+  if (request.Length() == 2 && request[1]->IsString()) {
+    CObjectString filename(request[1]);
+    char* path = File::GetCanonicalPath(filename.CString());
+    return new CObjectString(CObject::NewString(path));
+  }
+  return CObject::Null();
+}
+
+
+static CObject* FileDirectoryRequest(const CObjectArray& request) {
+  if (request.Length() == 2 && request[1]->IsString()) {
+    CObjectString filename(request[1]);
+    if (File::Exists(filename.CString())) {
+      char* str_copy = strdup(filename.CString());
+      char* path = File::GetContainingDirectory(str_copy);
+      free(str_copy);
+      if (path != NULL) {
+        CObject* result = new CObjectString(CObject::NewString(path));
+        free(path);
+        return result;
+      }
+    }
+  }
+  return CObject::Null();
+}
+
+
+static CObject* FileCloseRequest(const CObjectArray& request) {
+  intptr_t return_value = -1;
+  if (request.Length() == 2 && request[1]->IsIntptr()) {
+    File* file = CObjectToFilePointer(request[1]);
+    if (file != NULL) {
+      delete file;
+      return_value = 0;
+    }
+  }
+  return new CObjectIntptr(CObject::NewIntptr(return_value));
+}
+
+
+static CObject* FilePositionRequest(const CObjectArray& request) {
+  intptr_t return_value = -1;
+  if (request.Length() == 2 && request[1]->IsIntptr()) {
+    File* file = CObjectToFilePointer(request[1]);
+    if (file != NULL) {
+      return_value = file->Position();
+    }
+  }
+  return new CObjectIntptr(CObject::NewIntptr(return_value));
+}
+
+
+static CObject* FileSetPositionRequest(const CObjectArray& request) {
+  bool return_value = false;
+  if (request.Length() == 3 &&
+      request[1]->IsIntptr() &&
+      request[2]->IsInt32OrInt64()) {
+    File* file = CObjectToFilePointer(request[1]);
+    if (file != NULL) {
+      int64_t position = CObjectInt32OrInt64ToInt64(request[2]);
+      return_value = file->SetPosition(position);
+    }
+  }
+  return CObject::Bool(return_value);
+}
+
+
+static CObject* FileTruncateRequest(const CObjectArray& request) {
+  bool return_value = false;
+  if (request.Length() == 3 &&
+      request[1]->IsIntptr() &&
+      request[2]->IsInt32OrInt64()) {
+    File* file = CObjectToFilePointer(request[1]);
+    if (file != NULL) {
+      int64_t length = CObjectInt32OrInt64ToInt64(request[2]);
+      return_value = file->Truncate(length);
+    }
+  }
+  return CObject::Bool(return_value);
+}
+
+
+static CObject* FileLengthRequest(const CObjectArray& request) {
+  intptr_t return_value = -1;
+  if (request.Length() == 2 && request[1]->IsIntptr()) {
+    File* file = CObjectToFilePointer(request[1]);
+    if (file != NULL) {
+      return_value = file->Length();
+    }
+  }
+  return new CObjectIntptr(CObject::NewIntptr(return_value));
+}
+
+
+static CObject* FileFlushRequest(const CObjectArray& request) {
+  intptr_t return_value = -1;
+  if (request.Length() == 2 && request[1]->IsIntptr()) {
+    File* file = CObjectToFilePointer(request[1]);
+    if (file != NULL) {
+      file->Flush();
+      return_value = 0;
+    }
+  }
+  return new CObjectIntptr(CObject::NewIntptr(return_value));
+}
+
+
+static CObject* FileReadByteRequest(const CObjectArray& request) {
+  intptr_t return_value = -1;
+  if (request.Length() == 2 && request[1]->IsIntptr()) {
+    File* file = CObjectToFilePointer(request[1]);
+    if (file != NULL) {
+      uint8_t buffer;
+      int bytes_read = file->Read(reinterpret_cast<void*>(&buffer), 1);
+      if (bytes_read == 1) {
+        return_value = static_cast<intptr_t>(buffer);
+      } else {
+        return_value = -1;
+      }
+    }
+  }
+  return new CObjectIntptr(CObject::NewIntptr(return_value));
+}
+
+static CObject* FileWriteByteRequest(const CObjectArray& request) {
+  intptr_t return_value = -1;
+  if (request.Length() == 3 &&
+      request[1]->IsIntptr() &&
+      request[2]->IsInt32OrInt64()) {
+    File* file = CObjectToFilePointer(request[1]);
+    if (file != NULL) {
+      int64_t byte = CObjectInt32OrInt64ToInt64(request[2]);
+      uint8_t buffer = static_cast<uint8_t>(byte & 0xff);
+      int bytes_written = file->Write(reinterpret_cast<void*>(&buffer), 1);
+      if (bytes_written >= 0) {
+        return_value = bytes_written;
+      }
+    }
+  }
+  return new CObjectIntptr(CObject::NewIntptr(return_value));
+}
+
+static CObject* FileReadListRequest(const CObjectArray& request) {
+  if (request.Length() == 3 &&
+      request[1]->IsIntptr() &&
+      request[2]->IsInt32OrInt64()) {
+    File* file = CObjectToFilePointer(request[1]);
+    int64_t length = CObjectInt32OrInt64ToInt64(request[2]);
+    CObjectByteArray* byte_array =
+        new CObjectByteArray(CObject::NewByteArray(length));
+    void* buffer = reinterpret_cast<void*>(byte_array->Buffer());
+    int total_bytes_read = file->Read(buffer, byte_array->Length());
+    CObjectArray* result = new CObjectArray(CObject::NewArray(2));
+    result->SetAt(0, new CObjectIntptr(CObject::NewIntptr(total_bytes_read)));
+    result->SetAt(1, byte_array);
+    return result;
+  }
+  return CObject::Null();
+}
+
+
+static CObject* FileWriteListRequest(const CObjectArray& request) {
+  if (request.Length() == 5 &&
+      request[1]->IsIntptr() &&
+      (request[2]->IsByteArray() || request[2]->IsArray()) &&
+      request[3]->IsInt32OrInt64() &&
+      request[4]->IsInt32OrInt64()) {
+    File* file = CObjectToFilePointer(request[1]);
+    int64_t offset = CObjectInt32OrInt64ToInt64(request[3]);
+    int64_t length = CObjectInt32OrInt64ToInt64(request[4]);
+    uint8_t* buffer_start;
+    if (request[2]->IsByteArray()) {
+      CObjectByteArray byte_array(request[2]);
+      buffer_start = byte_array.Buffer() + offset;
+    } else {
+      CObjectArray array(request[2]);
+      buffer_start = new uint8_t[length];
+      for (int i = 0; i < length; i++) {
+        if (array[i + offset]->IsInt32OrInt64()) {
+          int64_t value = CObjectInt32OrInt64ToInt64(array[i + offset]);
+          buffer_start[i] = value & 0xFF;
+        } else {
+          // Unsupported type.
+          delete[] buffer_start;
+          return new CObjectInt32(CObject::NewInt32(-1));
+        }
+      }
+      offset = 0;
+    }
+    int64_t total_bytes_written =
+        file->Write(reinterpret_cast<void*>(buffer_start), length);
+    ASSERT(total_bytes_written == length);
+    if (!request[2]->IsByteArray()) {
+      delete[] buffer_start;
+    }
+    return new CObjectInt64(CObject::NewInt64(total_bytes_written));
+  }
+  return CObject::Null();
+}
+
+
+static CObject* FileWriteStringRequest(const CObjectArray& request) {
+  if (request.Length() == 3 &&
+      request[1]->IsIntptr() &&
+      request[2]->IsString()) {
+    File* file = CObjectToFilePointer(request[1]);
+    CObjectString str(request[2]);
+    const void* buffer = reinterpret_cast<const void*>(str.CString());
+    int64_t total_bytes_written = file->Write(buffer, str.Length());
+    ASSERT(total_bytes_written == str.Length());
+    return new CObjectInt64(CObject::NewInt64(total_bytes_written));
+  }
+  return CObject::Null();
+}
+
+
+void FileService(Dart_Port dest_port_id,
+                 Dart_Port reply_port_id,
+                 Dart_CObject* message) {
+  CObject* response = CObject::False();
+  CObjectArray request(message);
+  if (message->type == Dart_CObject::kArray) {
+    if (request.Length() > 1 && request[0]->IsInt32()) {
+      CObjectInt32 requestType(request[0]);
+      switch (requestType.Value()) {
+        case File::kExistsRequest:
+          response = FileExistsRequest(request);
+          break;
+        case File::kCreateRequest:
+          response = FileCreateRequest(request);
+          break;
+        case File::kOpenRequest:
+          response = FileOpenRequest(request);
+          break;
+        case File::kDeleteRequest:
+          response = FileDeleteRequest(request);
+          break;
+        case File::kFullPathRequest:
+          response = FileFullPathRequest(request);
+          break;
+        case File::kDirectoryRequest:
+          response = FileDirectoryRequest(request);
+          break;
+        case File::kCloseRequest:
+          response = FileCloseRequest(request);
+          break;
+        case File::kPositionRequest:
+          response = FilePositionRequest(request);
+          break;
+        case File::kSetPositionRequest:
+          response = FileSetPositionRequest(request);
+          break;
+        case File::kTruncateRequest:
+          response = FileTruncateRequest(request);
+          break;
+        case File::kLengthRequest:
+          response = FileLengthRequest(request);
+          break;
+        case File::kFlushRequest:
+          response = FileFlushRequest(request);
+          break;
+        case File::kReadByteRequest:
+          response = FileReadByteRequest(request);
+          break;
+        case File::kWriteByteRequest:
+          response = FileWriteByteRequest(request);
+          break;
+        case File::kReadListRequest:
+          response = FileReadListRequest(request);
+          break;
+        case File::kWriteListRequest:
+          response = FileWriteListRequest(request);
+          break;
+        case File::kWriteStringRequest:
+          response = FileWriteStringRequest(request);
+          break;
+        default:
+          UNREACHABLE();
+      }
+    }
+  }
+
+  Dart_PostCObject(reply_port_id, response->AsApiCObject());
+}
+
+
+void FUNCTION_NAME(File_NewServicePort)(Dart_NativeArguments args) {
+  Dart_EnterScope();
+  Dart_SetReturnValue(args, Dart_Null());
+  Dart_Port service_port = kIllegalPort;
+  service_port = Dart_NewNativePort("FileService",
+                                    FileService,
+                                    true);
+  if (service_port != kIllegalPort) {
+    // Return a send port for the service port.
+    Dart_Handle send_port = Dart_NewSendPort(service_port);
+    Dart_SetReturnValue(args, send_port);
+  }
+  Dart_ExitScope();
+}