runtime/vm/native_entry.cc - sdk.git - Git at Google

 // 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/native_symbol.h"
 #include "vm/object_store.h"
 #include "vm/reusable_handles.h"
 #include "vm/safepoint.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)");

 void DartNativeThrowArgumentException(const Instance& instance) {
   const Array& __args__ = Array::Handle(Array::New(1));
   __args__.SetAt(0, instance);
   Exceptions::ThrowByType(Exceptions::kArgument, __args__);
 }

 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() == NULL) {
     // Native methods are not allowed in the library to which this
     // class belongs in.
     return NULL;
   }
   Dart_NativeFunction native_function = NULL;
   {
     Thread* T = Thread::Current();
     TransitionVMToNative transition(T);
     Dart_EnterScope();  // Enter a new Dart API scope as we invoke API entries.
     Dart_NativeEntryResolver resolver = library.native_entry_resolver();
     native_function = resolver(Api::NewHandle(T, 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 == NULL) {
     // 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;
 }

 bool NativeEntry::ReturnValueIsError(NativeArguments* arguments) {
   RawObject* retval = arguments->ReturnValue();
   return (retval->IsHeapObject() &&
           RawObject::IsErrorClassId(retval->GetClassId()));
 }

 void NativeEntry::PropagateErrors(NativeArguments* arguments) {
   Thread* thread = arguments->thread();
   thread->UnwindScopes(thread->top_exit_frame_info());

   // The thread->zone() is different here than before we unwound.
   const Object& error =
       Object::Handle(thread->zone(), arguments->ReturnValue());
   Exceptions::PropagateError(Error::Cast(error));
   UNREACHABLE();
 }

 uword NativeEntry::NoScopeNativeCallWrapperEntry() {
   uword entry = reinterpret_cast<uword>(NativeEntry::NoScopeNativeCallWrapper);
 #if defined(USING_SIMULATOR) && !defined(TARGET_ARCH_DBC)
   // DBC does not use redirections unlike other simulators.
   entry = Simulator::RedirectExternalReference(
       entry, Simulator::kNativeCall, NativeEntry::kNumCallWrapperArguments);
 #endif
   return entry;
 }

 void NativeEntry::NoScopeNativeCallWrapper(Dart_NativeArguments args,
                                            Dart_NativeFunction func) {
   CHECK_STACK_ALIGNMENT;
   NoScopeNativeCallWrapperNoStackCheck(args, func);
 }

 void NativeEntry::NoScopeNativeCallWrapperNoStackCheck(
     Dart_NativeArguments args,
     Dart_NativeFunction func) {
   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();
   ASSERT(thread->execution_state() == Thread::kThreadInGenerated);
   {
     TransitionGeneratedToNative transition(thread);
     func(args);
     if (ReturnValueIsError(arguments)) {
       PropagateErrors(arguments);
     }
   }
   ASSERT(thread->execution_state() == Thread::kThreadInGenerated);
   VERIFY_ON_TRANSITION;
 }

 uword NativeEntry::AutoScopeNativeCallWrapperEntry() {
   uword entry =
       reinterpret_cast<uword>(NativeEntry::AutoScopeNativeCallWrapper);
 #if defined(USING_SIMULATOR) && !defined(TARGET_ARCH_DBC)
   // DBC does not use redirections unlike other simulators.
   entry = Simulator::RedirectExternalReference(
       entry, Simulator::kNativeCall, NativeEntry::kNumCallWrapperArguments);
 #endif
   return entry;
 }

 void NativeEntry::AutoScopeNativeCallWrapper(Dart_NativeArguments args,
                                              Dart_NativeFunction func) {
   CHECK_STACK_ALIGNMENT;
   AutoScopeNativeCallWrapperNoStackCheck(args, func);
 }

 void NativeEntry::AutoScopeNativeCallWrapperNoStackCheck(
     Dart_NativeArguments args,
     Dart_NativeFunction func) {
   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();
   ASSERT(thread->execution_state() == Thread::kThreadInGenerated);
   {
     Isolate* isolate = thread->isolate();
     ApiState* state = isolate->api_state();
     ASSERT(state != NULL);
     ApiLocalScope* current_top_scope = thread->api_top_scope();
     ApiLocalScope* scope = thread->api_reusable_scope();
     TRACE_NATIVE_CALL("0x%" Px "", reinterpret_cast<uintptr_t>(func));
     TransitionGeneratedToNative transition(thread);
     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());
       thread->set_api_reusable_scope(NULL);
     }
     thread->set_api_top_scope(scope);  // New scope is now the top scope.

     func(args);
     if (ReturnValueIsError(arguments)) {
       PropagateErrors(arguments);
     }

     ASSERT(current_top_scope == scope->previous());
     thread->set_api_top_scope(current_top_scope);  // Reset top scope to prev.
     if (thread->api_reusable_scope() == NULL) {
       scope->Reset(thread);  // Reset the old scope which we just exited.
       thread->set_api_reusable_scope(scope);
     } else {
       ASSERT(thread->api_reusable_scope() != scope);
       delete scope;
     }
     DEOPTIMIZE_ALOT;
   }
   ASSERT(thread->execution_state() == Thread::kThreadInGenerated);
   VERIFY_ON_TRANSITION;
 }

 // DBC does not support lazy native call linking.
 #if !defined(TARGET_ARCH_DBC)
 static NativeFunction ResolveNativeFunction(Zone* zone,
                                             const Function& func,
                                             bool* is_bootstrap_native,
                                             bool* is_auto_scope) {
   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());

   const String& native_name = String::Handle(zone, func.native_name());
   ASSERT(!native_name.IsNull());

   const int num_params = NativeArguments::ParameterCountForResolution(func);
   NativeFunction native_function = NativeEntry::ResolveNative(
       library, native_name, num_params, is_auto_scope);
   if (native_function == NULL) {
     FATAL2("Failed to resolve native function '%s' in '%s'\n",
            native_name.ToCString(), func.ToQualifiedCString());
   }
   return native_function;
 }

 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 is_bootstrap_native = false;
   bool is_auto_scope = true;

   {
     TransitionGeneratedToVM transition(arguments->thread());
     StackZone stack_zone(arguments->thread());
     Zone* zone = stack_zone.GetZone();

     DartFrameIterator iterator(arguments->thread(),
                                StackFrameIterator::kNoCrossThreadIteration);
     StackFrame* caller_frame = iterator.NextFrame();

     const Code& code = Code::Handle(zone, caller_frame->LookupDartCode());
     const Function& func = Function::Handle(zone, code.function());

     if (FLAG_trace_natives) {
       THR_Print("Resolving native target for %s\n", func.ToCString());
     }

     target_function =
         ResolveNativeFunction(arguments->thread()->zone(), func,
                               &is_bootstrap_native, &is_auto_scope);
     ASSERT(target_function != NULL);

 #if defined(DEBUG)
     {
       NativeFunction current_function = NULL;
       const Code& current_trampoline =
           Code::Handle(zone, 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::CallBootstrapNative_entry()->code());
     }
 #endif

     NativeFunction patch_target_function = target_function;
     Code& trampoline = Code::Handle(zone);
     if (is_bootstrap_native) {
       trampoline = StubCode::CallBootstrapNative_entry()->code();
 #if defined(USING_SIMULATOR)
       patch_target_function =
           reinterpret_cast<NativeFunction>(Simulator::RedirectExternalReference(
               reinterpret_cast<uword>(patch_target_function),
               Simulator::kBootstrapNativeCall, NativeEntry::kNumArguments));
 #endif
     } else if (is_auto_scope) {
       trampoline = StubCode::CallAutoScopeNative_entry()->code();
     } else {
       trampoline = StubCode::CallNoScopeNative_entry()->code();
     }

     CodePatcher::PatchNativeCallAt(caller_frame->pc(), code,
                                    patch_target_function, trampoline);

     if (FLAG_trace_natives) {
       THR_Print("    -> %p (%s)\n", target_function,
                 is_bootstrap_native ? "bootstrap" : "non-bootstrap");
     }
   }
   VERIFY_ON_TRANSITION;

   // Tail-call resolved target.
   if (is_bootstrap_native) {
     target_function(arguments);
   } else if (is_auto_scope) {
     // Because this call is within a compilation unit, Clang doesn't respect
     // the ABI alignment here.
     NativeEntry::AutoScopeNativeCallWrapperNoStackCheck(
         args, reinterpret_cast<Dart_NativeFunction>(target_function));
   } else {
     // Because this call is within a compilation unit, Clang doesn't respect
     // the ABI alignment here.
     NativeEntry::NoScopeNativeCallWrapperNoStackCheck(
         args, reinterpret_cast<Dart_NativeFunction>(target_function));
   }
 }
 #endif  // !defined(TARGET_ARCH_DBC)

 }  // namespace dart
	// 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/native_symbol.h"
	#include "vm/object_store.h"
	#include "vm/reusable_handles.h"
	#include "vm/safepoint.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)");

	void DartNativeThrowArgumentException(const Instance& instance) {
	const Array& __args__ = Array::Handle(Array::New(1));
	__args__.SetAt(0, instance);
	Exceptions::ThrowByType(Exceptions::kArgument, __args__);
	}

	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() == NULL) {
	// Native methods are not allowed in the library to which this
	// class belongs in.
	return NULL;
	}
	Dart_NativeFunction native_function = NULL;
	{
	Thread* T = Thread::Current();
	TransitionVMToNative transition(T);
	Dart_EnterScope(); // Enter a new Dart API scope as we invoke API entries.
	Dart_NativeEntryResolver resolver = library.native_entry_resolver();
	native_function = resolver(Api::NewHandle(T, 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 == NULL) {
	// 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;
	}

	bool NativeEntry::ReturnValueIsError(NativeArguments* arguments) {
	RawObject* retval = arguments->ReturnValue();
	return (retval->IsHeapObject() &&
	RawObject::IsErrorClassId(retval->GetClassId()));
	}

	void NativeEntry::PropagateErrors(NativeArguments* arguments) {
	Thread* thread = arguments->thread();
	thread->UnwindScopes(thread->top_exit_frame_info());

	// The thread->zone() is different here than before we unwound.
	const Object& error =
	Object::Handle(thread->zone(), arguments->ReturnValue());
	Exceptions::PropagateError(Error::Cast(error));
	UNREACHABLE();
	}

	uword NativeEntry::NoScopeNativeCallWrapperEntry() {
	uword entry = reinterpret_cast<uword>(NativeEntry::NoScopeNativeCallWrapper);
	#if defined(USING_SIMULATOR) && !defined(TARGET_ARCH_DBC)
	// DBC does not use redirections unlike other simulators.
	entry = Simulator::RedirectExternalReference(
	entry, Simulator::kNativeCall, NativeEntry::kNumCallWrapperArguments);
	#endif
	return entry;
	}

	void NativeEntry::NoScopeNativeCallWrapper(Dart_NativeArguments args,
	Dart_NativeFunction func) {
	CHECK_STACK_ALIGNMENT;
	NoScopeNativeCallWrapperNoStackCheck(args, func);
	}

	void NativeEntry::NoScopeNativeCallWrapperNoStackCheck(
	Dart_NativeArguments args,
	Dart_NativeFunction func) {
	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();
	ASSERT(thread->execution_state() == Thread::kThreadInGenerated);
	{
	TransitionGeneratedToNative transition(thread);
	func(args);
	if (ReturnValueIsError(arguments)) {
	PropagateErrors(arguments);
	}
	}
	ASSERT(thread->execution_state() == Thread::kThreadInGenerated);
	VERIFY_ON_TRANSITION;
	}

	uword NativeEntry::AutoScopeNativeCallWrapperEntry() {
	uword entry =
	reinterpret_cast<uword>(NativeEntry::AutoScopeNativeCallWrapper);
	#if defined(USING_SIMULATOR) && !defined(TARGET_ARCH_DBC)
	// DBC does not use redirections unlike other simulators.
	entry = Simulator::RedirectExternalReference(
	entry, Simulator::kNativeCall, NativeEntry::kNumCallWrapperArguments);
	#endif
	return entry;
	}

	void NativeEntry::AutoScopeNativeCallWrapper(Dart_NativeArguments args,
	Dart_NativeFunction func) {
	CHECK_STACK_ALIGNMENT;
	AutoScopeNativeCallWrapperNoStackCheck(args, func);
	}

	void NativeEntry::AutoScopeNativeCallWrapperNoStackCheck(
	Dart_NativeArguments args,
	Dart_NativeFunction func) {
	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();
	ASSERT(thread->execution_state() == Thread::kThreadInGenerated);
	{
	Isolate* isolate = thread->isolate();
	ApiState* state = isolate->api_state();
	ASSERT(state != NULL);
	ApiLocalScope* current_top_scope = thread->api_top_scope();
	ApiLocalScope* scope = thread->api_reusable_scope();
	TRACE_NATIVE_CALL("0x%" Px "", reinterpret_cast<uintptr_t>(func));
	TransitionGeneratedToNative transition(thread);
	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());
	thread->set_api_reusable_scope(NULL);
	}
	thread->set_api_top_scope(scope); // New scope is now the top scope.

	func(args);
	if (ReturnValueIsError(arguments)) {
	PropagateErrors(arguments);
	}

	ASSERT(current_top_scope == scope->previous());
	thread->set_api_top_scope(current_top_scope); // Reset top scope to prev.
	if (thread->api_reusable_scope() == NULL) {
	scope->Reset(thread); // Reset the old scope which we just exited.
	thread->set_api_reusable_scope(scope);
	} else {
	ASSERT(thread->api_reusable_scope() != scope);
	delete scope;
	}
	DEOPTIMIZE_ALOT;
	}
	ASSERT(thread->execution_state() == Thread::kThreadInGenerated);
	VERIFY_ON_TRANSITION;
	}

	// DBC does not support lazy native call linking.
	#if !defined(TARGET_ARCH_DBC)
	static NativeFunction ResolveNativeFunction(Zone* zone,
	const Function& func,
	bool* is_bootstrap_native,
	bool* is_auto_scope) {
	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());

	const String& native_name = String::Handle(zone, func.native_name());
	ASSERT(!native_name.IsNull());

	const int num_params = NativeArguments::ParameterCountForResolution(func);
	NativeFunction native_function = NativeEntry::ResolveNative(
	library, native_name, num_params, is_auto_scope);
	if (native_function == NULL) {
	FATAL2("Failed to resolve native function '%s' in '%s'\n",
	native_name.ToCString(), func.ToQualifiedCString());
	}
	return native_function;
	}

	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 is_bootstrap_native = false;
	bool is_auto_scope = true;

	{
	TransitionGeneratedToVM transition(arguments->thread());
	StackZone stack_zone(arguments->thread());
	Zone* zone = stack_zone.GetZone();

	DartFrameIterator iterator(arguments->thread(),
	StackFrameIterator::kNoCrossThreadIteration);
	StackFrame* caller_frame = iterator.NextFrame();

	const Code& code = Code::Handle(zone, caller_frame->LookupDartCode());
	const Function& func = Function::Handle(zone, code.function());

	if (FLAG_trace_natives) {
	THR_Print("Resolving native target for %s\n", func.ToCString());
	}

	target_function =
	ResolveNativeFunction(arguments->thread()->zone(), func,
	&is_bootstrap_native, &is_auto_scope);
	ASSERT(target_function != NULL);

	#if defined(DEBUG)
	{
	NativeFunction current_function = NULL;
	const Code& current_trampoline =
	Code::Handle(zone, 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::CallBootstrapNative_entry()->code());
	}
	#endif

	NativeFunction patch_target_function = target_function;
	Code& trampoline = Code::Handle(zone);
	if (is_bootstrap_native) {
	trampoline = StubCode::CallBootstrapNative_entry()->code();
	#if defined(USING_SIMULATOR)
	patch_target_function =
	reinterpret_cast<NativeFunction>(Simulator::RedirectExternalReference(
	reinterpret_cast<uword>(patch_target_function),
	Simulator::kBootstrapNativeCall, NativeEntry::kNumArguments));
	#endif
	} else if (is_auto_scope) {
	trampoline = StubCode::CallAutoScopeNative_entry()->code();
	} else {
	trampoline = StubCode::CallNoScopeNative_entry()->code();
	}

	CodePatcher::PatchNativeCallAt(caller_frame->pc(), code,
	patch_target_function, trampoline);

	if (FLAG_trace_natives) {
	THR_Print(" -> %p (%s)\n", target_function,
	is_bootstrap_native ? "bootstrap" : "non-bootstrap");
	}
	}
	VERIFY_ON_TRANSITION;

	// Tail-call resolved target.
	if (is_bootstrap_native) {
	target_function(arguments);
	} else if (is_auto_scope) {
	// Because this call is within a compilation unit, Clang doesn't respect
	// the ABI alignment here.
	NativeEntry::AutoScopeNativeCallWrapperNoStackCheck(
	args, reinterpret_cast<Dart_NativeFunction>(target_function));
	} else {
	// Because this call is within a compilation unit, Clang doesn't respect
	// the ABI alignment here.
	NativeEntry::NoScopeNativeCallWrapperNoStackCheck(
	args, reinterpret_cast<Dart_NativeFunction>(target_function));
	}
	}
	#endif // !defined(TARGET_ARCH_DBC)

	} // namespace dart