iposva@google.com
d36cd610cb
- Do not emit an name for ExternalLabel. R=johnmccutchan@google.com, srdjan@google.com Review URL: https://codereview.chromium.org//306483005 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@36662 260f80e4-7a28-3924-810f-c04153c831b5
124 lines
4.0 KiB
C++
124 lines
4.0 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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#include "vm/object_store.h"
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#include "vm/reusable_handles.h"
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#include "vm/tags.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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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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bool* auto_setup_scope) {
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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, auto_setup_scope);
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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 uint8_t* NativeEntry::ResolveSymbolInLibrary(const Library& library,
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uword pc) {
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Dart_NativeEntrySymbol symbol_resolver =
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library.native_entry_symbol_resolver();
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if (symbol_resolver == 0) {
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// Cannot reverse lookup native entries.
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return NULL;
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}
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return symbol_resolver(reinterpret_cast<Dart_NativeFunction>(pc));
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}
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const uint8_t* NativeEntry::ResolveSymbol(uword pc) {
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Isolate* isolate = Isolate::Current();
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REUSABLE_GROWABLE_OBJECT_ARRAY_HANDLESCOPE(isolate);
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GrowableObjectArray& libs = reused_growable_object_array_handle.Handle();
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libs ^= isolate->object_store()->libraries();
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ASSERT(!libs.IsNull());
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intptr_t num_libs = libs.Length();
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for (intptr_t i = 0; i < num_libs; i++) {
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REUSABLE_LIBRARY_HANDLESCOPE(isolate);
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Library& lib = reused_library_handle.Handle();
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lib ^= libs.At(i);
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ASSERT(!lib.IsNull());
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const uint8_t* r = ResolveSymbolInLibrary(lib, pc);
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if (r != NULL) {
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return r;
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}
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}
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return NULL;
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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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