blob: a121d71df204c27a0731c48adb745bd11e2d8cc8 [file] [log] [blame]
// 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/object_store.h"
#include "vm/reusable_handles.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(
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 uint8_t* NativeEntry::ResolveSymbolInLibrary(const Library& library,
uword pc) {
Dart_NativeEntrySymbol symbol_resolver =
library.native_entry_symbol_resolver();
if (symbol_resolver == 0) {
// Cannot reverse lookup native entries.
return NULL;
}
return symbol_resolver(reinterpret_cast<Dart_NativeFunction>(pc));
}
const uint8_t* NativeEntry::ResolveSymbol(uword pc) {
Isolate* isolate = Isolate::Current();
REUSABLE_GROWABLE_OBJECT_ARRAY_HANDLESCOPE(isolate);
GrowableObjectArray& libs = reused_growable_object_array_handle.Handle();
libs ^= isolate->object_store()->libraries();
ASSERT(!libs.IsNull());
intptr_t num_libs = libs.Length();
for (intptr_t i = 0; i < num_libs; i++) {
REUSABLE_LIBRARY_HANDLESCOPE(isolate);
Library& lib = reused_library_handle.Handle();
lib ^= libs.At(i);
ASSERT(!lib.IsNull());
const uint8_t* r = ResolveSymbolInLibrary(lib, pc);
if (r != NULL) {
return r;
}
}
return NULL;
}
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