asiva@google.com
d6aaf0cc94
2. Add tracing of external native functions under --trace-natives flag 3. Added a _printCurrentStacktrace() function so that one could get a dart stack trace under 'gdb' when in a native or runtime function. R=regis@google.com Review URL: https://codereview.chromium.org//23453035 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@27166 260f80e4-7a28-3924-810f-c04153c831b5
86 lines
2.8 KiB
C++
86 lines
2.8 KiB
C++
// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "vm/native_entry.h"
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#include "include/dart_api.h"
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#include "vm/dart_api_impl.h"
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#include "vm/dart_api_state.h"
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namespace dart {
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DEFINE_FLAG(bool, trace_natives, false,
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"Trace invocation of natives (debug mode only)");
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static ExternalLabel native_call_label(
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"native_function_call",
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reinterpret_cast<uword>(&NativeEntry::NativeCallWrapper));
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NativeFunction NativeEntry::ResolveNative(const Library& library,
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const String& function_name,
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int number_of_arguments) {
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// Now resolve the native function to the corresponding native entrypoint.
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if (library.native_entry_resolver() == 0) {
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// Native methods are not allowed in the library to which this
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// class belongs in.
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return NULL;
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}
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Dart_EnterScope(); // Enter a new Dart API scope as we invoke API entries.
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Dart_NativeEntryResolver resolver = library.native_entry_resolver();
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Dart_NativeFunction native_function =
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resolver(Api::NewHandle(Isolate::Current(), function_name.raw()),
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number_of_arguments);
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Dart_ExitScope(); // Exit the Dart API scope.
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return reinterpret_cast<NativeFunction>(native_function);
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}
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const ExternalLabel& NativeEntry::NativeCallWrapperLabel() {
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return native_call_label;
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}
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void NativeEntry::NativeCallWrapper(Dart_NativeArguments args,
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Dart_NativeFunction func) {
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CHECK_STACK_ALIGNMENT;
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VERIFY_ON_TRANSITION;
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NativeArguments* arguments = reinterpret_cast<NativeArguments*>(args);
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Isolate* isolate = arguments->isolate();
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ApiState* state = isolate->api_state();
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ASSERT(state != NULL);
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ApiLocalScope* current_top_scope = state->top_scope();
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ApiLocalScope* scope = state->reusable_scope();
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TRACE_NATIVE_CALL("0x%" Px "", reinterpret_cast<uintptr_t>(func));
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if (scope == NULL) {
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scope = new ApiLocalScope(current_top_scope,
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isolate->top_exit_frame_info());
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ASSERT(scope != NULL);
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} else {
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scope->Reinit(isolate,
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current_top_scope,
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isolate->top_exit_frame_info());
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state->set_reusable_scope(NULL);
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}
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state->set_top_scope(scope); // New scope is now the top scope.
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func(args);
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ASSERT(current_top_scope == scope->previous());
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state->set_top_scope(current_top_scope); // Reset top scope to previous.
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if (state->reusable_scope() == NULL) {
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scope->Reset(isolate); // Reset the old scope which we just exited.
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state->set_reusable_scope(scope);
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} else {
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ASSERT(state->reusable_scope() != scope);
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delete scope;
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}
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DEOPTIMIZE_ALOT;
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VERIFY_ON_TRANSITION;
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}
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} // namespace dart
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