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/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
	// 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