| // 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 "vm/native_entry.h" |
| |
| #include "include/dart_api.h" |
| |
| #include "vm/dart_api_impl.h" |
| #include "vm/dart_api_state.h" |
| #include "vm/tags.h" |
| |
| |
| namespace dart { |
| |
| DEFINE_FLAG(bool, trace_natives, false, |
| "Trace invocation of natives (debug mode only)"); |
| |
| |
| static ExternalLabel native_call_label( |
| "native_function_call", |
| reinterpret_cast<uword>(&NativeEntry::NativeCallWrapper)); |
| |
| |
| NativeFunction NativeEntry::ResolveNative(const Library& library, |
| const String& function_name, |
| int number_of_arguments, |
| bool* auto_setup_scope) { |
| // Now resolve the native function to the corresponding native entrypoint. |
| if (library.native_entry_resolver() == 0) { |
| // Native methods are not allowed in the library to which this |
| // class belongs in. |
| return NULL; |
| } |
| Dart_EnterScope(); // Enter a new Dart API scope as we invoke API entries. |
| Dart_NativeEntryResolver resolver = library.native_entry_resolver(); |
| Dart_NativeFunction native_function = |
| resolver(Api::NewHandle(Isolate::Current(), function_name.raw()), |
| number_of_arguments, auto_setup_scope); |
| Dart_ExitScope(); // Exit the Dart API scope. |
| return reinterpret_cast<NativeFunction>(native_function); |
| } |
| |
| |
| const ExternalLabel& NativeEntry::NativeCallWrapperLabel() { |
| return native_call_label; |
| } |
| |
| |
| void NativeEntry::NativeCallWrapper(Dart_NativeArguments args, |
| Dart_NativeFunction func) { |
| CHECK_STACK_ALIGNMENT; |
| VERIFY_ON_TRANSITION; |
| NativeArguments* arguments = reinterpret_cast<NativeArguments*>(args); |
| Isolate* isolate = arguments->isolate(); |
| |
| ApiState* state = isolate->api_state(); |
| ASSERT(state != NULL); |
| ApiLocalScope* current_top_scope = state->top_scope(); |
| ApiLocalScope* scope = state->reusable_scope(); |
| TRACE_NATIVE_CALL("0x%" Px "", reinterpret_cast<uintptr_t>(func)); |
| if (scope == NULL) { |
| scope = new ApiLocalScope(current_top_scope, |
| isolate->top_exit_frame_info()); |
| ASSERT(scope != NULL); |
| } else { |
| scope->Reinit(isolate, |
| current_top_scope, |
| isolate->top_exit_frame_info()); |
| state->set_reusable_scope(NULL); |
| } |
| state->set_top_scope(scope); // New scope is now the top scope. |
| |
| func(args); |
| |
| ASSERT(current_top_scope == scope->previous()); |
| state->set_top_scope(current_top_scope); // Reset top scope to previous. |
| if (state->reusable_scope() == NULL) { |
| scope->Reset(isolate); // Reset the old scope which we just exited. |
| state->set_reusable_scope(scope); |
| } else { |
| ASSERT(state->reusable_scope() != scope); |
| delete scope; |
| } |
| DEOPTIMIZE_ALOT; |
| VERIFY_ON_TRANSITION; |
| } |
| |
| } // namespace dart |