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// 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/bootstrap.h"
#include "vm/code_patcher.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/stack_frame.h"
#include "vm/symbols.h"
#include "vm/tags.h"
namespace dart {
DEFINE_FLAG(bool, trace_natives, false,
"Trace invocation of natives (debug mode only)");
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) {
Thread* thread = Thread::Current();
REUSABLE_GROWABLE_OBJECT_ARRAY_HANDLESCOPE(thread);
GrowableObjectArray& libs = reused_growable_object_array_handle.Handle();
libs ^= thread->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(thread);
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;
}
uword NativeEntry::NativeCallWrapperEntry() {
uword entry = reinterpret_cast<uword>(NativeEntry::NativeCallWrapper);
#if defined(USING_SIMULATOR)
entry = Simulator::RedirectExternalReference(
entry, Simulator::kNativeCall, NativeEntry::kNumCallWrapperArguments);
#endif
return entry;
}
void NativeEntry::NativeCallWrapper(Dart_NativeArguments args,
Dart_NativeFunction func) {
CHECK_STACK_ALIGNMENT;
VERIFY_ON_TRANSITION;
NativeArguments* arguments = reinterpret_cast<NativeArguments*>(args);
/* Tell MemorySanitizer 'arguments' is initialized by generated code. */
MSAN_UNPOISON(arguments, sizeof(*arguments));
Thread* thread = arguments->thread();
Isolate* isolate = thread->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,
thread->top_exit_frame_info());
ASSERT(scope != NULL);
} else {
scope->Reinit(thread,
current_top_scope,
thread->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(thread); // 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;
}
static bool IsNativeKeyword(const TokenStream::Iterator& it) {
return Token::IsIdentifier(it.CurrentTokenKind()) &&
(it.CurrentLiteral() == Symbols::Native().raw());
}
static NativeFunction ResolveNativeFunction(Zone* zone,
const Function& func,
bool* is_bootstrap_native) {
const Script& script = Script::Handle(zone, func.script());
const Class& cls = Class::Handle(zone, func.Owner());
const Library& library = Library::Handle(zone, cls.library());
*is_bootstrap_native =
Bootstrap::IsBootstapResolver(library.native_entry_resolver());
TokenStream::Iterator it(TokenStream::Handle(zone, script.tokens()),
func.token_pos());
const intptr_t end_pos = func.end_token_pos();
while (!IsNativeKeyword(it) && it.CurrentPosition() <= end_pos) {
it.Advance();
}
ASSERT(IsNativeKeyword(it));
it.Advance();
ASSERT(it.CurrentTokenKind() == Token::kSTRING);
const String& native_name = String::Handle(it.CurrentLiteral());
const int num_params = NativeArguments::ParameterCountForResolution(func);
bool auto_setup_scope = true;
return NativeEntry::ResolveNative(
library, native_name, num_params, &auto_setup_scope);
}
uword NativeEntry::LinkNativeCallEntry() {
uword entry = reinterpret_cast<uword>(NativeEntry::LinkNativeCall);
#if defined(USING_SIMULATOR)
entry = Simulator::RedirectExternalReference(
entry, Simulator::kBootstrapNativeCall, NativeEntry::kNumArguments);
#endif
return entry;
}
void NativeEntry::LinkNativeCall(Dart_NativeArguments args) {
CHECK_STACK_ALIGNMENT;
VERIFY_ON_TRANSITION;
NativeArguments* arguments = reinterpret_cast<NativeArguments*>(args);
/* Tell MemorySanitizer 'arguments' is initialized by generated code. */
MSAN_UNPOISON(arguments, sizeof(*arguments));
TRACE_NATIVE_CALL("%s", "LinkNative");
NativeFunction target_function = NULL;
bool call_through_wrapper = false;
#ifdef USING_SIMULATOR
bool is_native_auto_setup_scope = false;
#endif
{
StackZone zone(arguments->thread());
DartFrameIterator iterator;
StackFrame* caller_frame = iterator.NextFrame();
const Code& code = Code::Handle(caller_frame->LookupDartCode());
const Function& func = Function::Handle(code.function());
#ifdef USING_SIMULATOR
is_native_auto_setup_scope = func.IsNativeAutoSetupScope();
#endif
if (FLAG_trace_natives) {
OS::Print("Resolving native target for %s\n", func.ToCString());
}
bool is_bootstrap_native = false;
target_function = ResolveNativeFunction(
arguments->thread()->zone(), func, &is_bootstrap_native);
ASSERT(target_function != NULL);
#if defined(DEBUG)
{
NativeFunction current_function = NULL;
const Code& current_trampoline = Code::Handle(
CodePatcher::GetNativeCallAt(caller_frame->pc(),
code,
&current_function));
#if !defined(USING_SIMULATOR)
ASSERT(current_function ==
reinterpret_cast<NativeFunction>(LinkNativeCall));
#else
ASSERT(current_function ==
reinterpret_cast<NativeFunction>(
Simulator::RedirectExternalReference(
reinterpret_cast<uword>(LinkNativeCall),
Simulator::kBootstrapNativeCall,
NativeEntry::kNumArguments)));
#endif
ASSERT(current_trampoline.raw() ==
StubCode::CallBootstrapCFunction_entry()->code());
}
#endif
const intptr_t argc_tag = NativeArguments::ComputeArgcTag(func);
const bool is_leaf_call =
(argc_tag & NativeArguments::AutoSetupScopeMask()) == 0;
call_through_wrapper = !is_bootstrap_native && !is_leaf_call;
const Code& trampoline = Code::Handle(call_through_wrapper ?
StubCode::CallNativeCFunction_entry()->code() :
StubCode::CallBootstrapCFunction_entry()->code());
NativeFunction patch_target_function = target_function;
#if defined(USING_SIMULATOR)
if (!call_through_wrapper || !is_native_auto_setup_scope) {
patch_target_function = reinterpret_cast<NativeFunction>(
Simulator::RedirectExternalReference(
reinterpret_cast<uword>(patch_target_function),
Simulator::kBootstrapNativeCall, NativeEntry::kNumArguments));
}
#endif
CodePatcher::PatchNativeCallAt(
caller_frame->pc(), code, patch_target_function, trampoline);
if (FLAG_trace_natives) {
OS::Print(" -> %p (%s, %s)\n",
target_function,
is_bootstrap_native ? "bootstrap" : "non-bootstrap",
is_leaf_call ? "leaf" : "non-leaf");
}
}
VERIFY_ON_TRANSITION;
// Tail-call resolved target.
if (call_through_wrapper) {
NativeEntry::NativeCallWrapper(
args, reinterpret_cast<Dart_NativeFunction>(target_function));
} else {
target_function(arguments);
}
}
} // namespace dart