blob: e58fb708049a74406ca99afc2d52d21be141e3e0 [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/runtime_entry.h"
#include "vm/code_patcher.h"
#include "vm/compiler/assembler/assembler.h"
#include "vm/compiler/frontend/bytecode_reader.h"
#include "vm/compiler/jit/compiler.h"
#include "vm/dart_api_impl.h"
#include "vm/dart_entry.h"
#include "vm/debugger.h"
#include "vm/deopt_instructions.h"
#include "vm/exceptions.h"
#include "vm/flags.h"
#include "vm/heap/verifier.h"
#include "vm/instructions.h"
#include "vm/interpreter.h"
#include "vm/kernel_isolate.h"
#include "vm/message.h"
#include "vm/message_handler.h"
#include "vm/object_store.h"
#include "vm/parser.h"
#include "vm/resolver.h"
#include "vm/service_isolate.h"
#include "vm/stack_frame.h"
#include "vm/symbols.h"
#include "vm/thread_registry.h"
#include "vm/type_testing_stubs.h"
namespace dart {
DEFINE_FLAG(
int,
max_subtype_cache_entries,
100,
"Maximum number of subtype cache entries (number of checks cached).");
DEFINE_FLAG(
int,
regexp_optimization_counter_threshold,
1000,
"RegExp's usage-counter value before it is optimized, -1 means never");
DEFINE_FLAG(int,
reoptimization_counter_threshold,
4000,
"Counter threshold before a function gets reoptimized.");
DEFINE_FLAG(bool, trace_deoptimization, false, "Trace deoptimization");
DEFINE_FLAG(bool,
trace_deoptimization_verbose,
false,
"Trace deoptimization verbose");
DEFINE_FLAG(bool, trace_ic, false, "Trace IC handling");
DEFINE_FLAG(bool,
trace_ic_miss_in_optimized,
false,
"Trace IC miss in optimized code");
DEFINE_FLAG(bool,
trace_optimized_ic_calls,
false,
"Trace IC calls in optimized code.");
DEFINE_FLAG(bool, trace_patching, false, "Trace patching of code.");
DEFINE_FLAG(bool, trace_runtime_calls, false, "Trace runtime calls");
DEFINE_FLAG(bool, trace_type_checks, false, "Trace runtime type checks.");
DECLARE_FLAG(bool, enable_interpreter);
DECLARE_FLAG(int, max_deoptimization_counter_threshold);
DECLARE_FLAG(bool, enable_inlining_annotations);
DECLARE_FLAG(bool, trace_compiler);
DECLARE_FLAG(bool, trace_optimizing_compiler);
DECLARE_FLAG(int, max_polymorphic_checks);
DEFINE_FLAG(bool, trace_osr, false, "Trace attempts at on-stack replacement.");
DEFINE_FLAG(int,
stacktrace_every,
0,
"Compute debugger stacktrace on every N stack overflow checks");
DEFINE_FLAG(charp,
stacktrace_filter,
NULL,
"Compute stacktrace in named function on stack overflow checks");
DEFINE_FLAG(charp,
deoptimize_filter,
NULL,
"Deoptimize in named function on stack overflow checks");
DECLARE_FLAG(int, reload_every);
DECLARE_FLAG(bool, reload_every_optimized);
DECLARE_FLAG(bool, reload_every_back_off);
#ifdef DEBUG
DEFINE_FLAG(charp,
gc_at_instance_allocation,
NULL,
"Perform a GC before allocation of instances of "
"the specified class");
#endif
#if defined(TESTING) || defined(DEBUG)
void VerifyOnTransition() {
Thread* thread = Thread::Current();
TransitionGeneratedToVM transition(thread);
VerifyPointersVisitor::VerifyPointers();
thread->isolate()->heap()->Verify();
}
#endif
// Add function to a class and that class to the class dictionary so that
// frame walking can be used.
const Function& RegisterFakeFunction(const char* name, const Code& code) {
Thread* thread = Thread::Current();
const String& class_name = String::Handle(Symbols::New(thread, "ownerClass"));
const Script& script = Script::Handle();
const Library& lib = Library::Handle(Library::CoreLibrary());
const Class& owner_class = Class::Handle(
Class::New(lib, class_name, script, TokenPosition::kNoSource));
const String& function_name = String::ZoneHandle(Symbols::New(thread, name));
const Function& function = Function::ZoneHandle(Function::New(
function_name, RawFunction::kRegularFunction, true, false, false, false,
false, owner_class, TokenPosition::kMinSource));
const Array& functions = Array::Handle(Array::New(1));
functions.SetAt(0, function);
owner_class.SetFunctions(functions);
lib.AddClass(owner_class);
function.AttachCode(code);
return function;
}
DEFINE_RUNTIME_ENTRY(TraceFunctionEntry, 1) {
const Function& function = Function::CheckedHandle(arguments.ArgAt(0));
const String& function_name = String::Handle(function.name());
const String& class_name =
String::Handle(Class::Handle(function.Owner()).Name());
OS::PrintErr("> Entering '%s.%s'\n", class_name.ToCString(),
function_name.ToCString());
}
DEFINE_RUNTIME_ENTRY(TraceFunctionExit, 1) {
const Function& function = Function::CheckedHandle(arguments.ArgAt(0));
const String& function_name = String::Handle(function.name());
const String& class_name =
String::Handle(Class::Handle(function.Owner()).Name());
OS::PrintErr("< Exiting '%s.%s'\n", class_name.ToCString(),
function_name.ToCString());
}
DEFINE_RUNTIME_ENTRY(RangeError, 2) {
const Instance& length = Instance::CheckedHandle(arguments.ArgAt(0));
const Instance& index = Instance::CheckedHandle(arguments.ArgAt(1));
if (!length.IsInteger()) {
// Throw: new ArgumentError.value(length, "length", "is not an integer");
const Array& args = Array::Handle(Array::New(3));
args.SetAt(0, length);
args.SetAt(1, Symbols::Length());
args.SetAt(2, String::Handle(String::New("is not an integer")));
Exceptions::ThrowByType(Exceptions::kArgumentValue, args);
}
if (!index.IsInteger()) {
// Throw: new ArgumentError.value(index, "index", "is not an integer");
const Array& args = Array::Handle(Array::New(3));
args.SetAt(0, index);
args.SetAt(1, Symbols::Index());
args.SetAt(2, String::Handle(String::New("is not an integer")));
Exceptions::ThrowByType(Exceptions::kArgumentValue, args);
}
// Throw: new RangeError.range(index, 0, length - 1, "length");
const Array& args = Array::Handle(Array::New(4));
args.SetAt(0, index);
args.SetAt(1, Integer::Handle(Integer::New(0)));
args.SetAt(2, Integer::Handle(Integer::Cast(length).ArithmeticOp(
Token::kSUB, Integer::Handle(Integer::New(1)))));
args.SetAt(3, Symbols::Length());
Exceptions::ThrowByType(Exceptions::kRange, args);
}
static void NullErrorHelper(Zone* zone, const String& selector) {
InvocationMirror::Kind kind = InvocationMirror::kMethod;
if (Field::IsGetterName(selector)) {
kind = InvocationMirror::kGetter;
} else if (Field::IsSetterName(selector)) {
kind = InvocationMirror::kSetter;
}
const Smi& invocation_type = Smi::Handle(
zone,
Smi::New(InvocationMirror::EncodeType(InvocationMirror::kDynamic, kind)));
const Array& args = Array::Handle(zone, Array::New(6));
args.SetAt(0, /* instance */ Object::null_object());
args.SetAt(1, selector);
args.SetAt(2, invocation_type);
args.SetAt(3, /* func_type_args */ Object::null_object());
args.SetAt(4, /* func_args */ Object::null_object());
args.SetAt(5, /* func_arg_names */ Object::null_object());
Exceptions::ThrowByType(Exceptions::kNoSuchMethod, args);
}
DEFINE_RUNTIME_ENTRY(NullError, 0) {
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
const StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame->IsDartFrame());
const Code& code = Code::Handle(zone, caller_frame->LookupDartCode());
const uword pc_offset = caller_frame->pc() - code.PayloadStart();
if (FLAG_shared_slow_path_triggers_gc) {
isolate->heap()->CollectAllGarbage();
}
const CodeSourceMap& map =
CodeSourceMap::Handle(zone, code.code_source_map());
ASSERT(!map.IsNull());
CodeSourceMapReader reader(map, Array::null_array(),
Function::null_function());
const intptr_t name_index = reader.GetNullCheckNameIndexAt(pc_offset);
RELEASE_ASSERT(name_index >= 0);
const ObjectPool& pool = ObjectPool::Handle(zone, code.object_pool());
const String& member_name =
String::CheckedHandle(zone, pool.ObjectAt(name_index));
NullErrorHelper(zone, member_name);
}
DEFINE_RUNTIME_ENTRY(NullErrorWithSelector, 1) {
const String& selector = String::CheckedHandle(arguments.ArgAt(0));
NullErrorHelper(zone, selector);
}
DEFINE_RUNTIME_ENTRY(ArgumentError, 1) {
const Instance& value = Instance::CheckedHandle(arguments.ArgAt(0));
Exceptions::ThrowArgumentError(value);
}
DEFINE_RUNTIME_ENTRY(ArgumentErrorUnboxedInt64, 0) {
// Unboxed value is passed through a dedicated slot in Thread.
int64_t unboxed_value = arguments.thread()->unboxed_int64_runtime_arg();
const Integer& value = Integer::Handle(zone, Integer::New(unboxed_value));
Exceptions::ThrowArgumentError(value);
}
DEFINE_RUNTIME_ENTRY(IntegerDivisionByZeroException, 0) {
const Array& args = Array::Handle(Array::New(0));
Exceptions::ThrowByType(Exceptions::kIntegerDivisionByZeroException, args);
}
static void EnsureNewOrRemembered(Isolate* isolate,
Thread* thread,
const Object& result) {
// For write barrier elimination, we need to ensure that the allocation ends
// up in the new space if Heap::IsGuaranteedNewSpaceAllocation is true for
// this size or else the object needs to go into the store buffer.
if (!isolate->heap()->new_space()->Contains(
reinterpret_cast<uword>(result.raw()))) {
result.raw()->SetRememberedBit();
thread->StoreBufferAddObject(result.raw());
}
}
// Allocation of a fixed length array of given element type.
// This runtime entry is never called for allocating a List of a generic type,
// because a prior run time call instantiates the element type if necessary.
// Arg0: array length.
// Arg1: array type arguments, i.e. vector of 1 type, the element type.
// Return value: newly allocated array of length arg0.
DEFINE_RUNTIME_ENTRY(AllocateArray, 2) {
const Instance& length = Instance::CheckedHandle(arguments.ArgAt(0));
if (!length.IsInteger()) {
// Throw: new ArgumentError.value(length, "length", "is not an integer");
const Array& args = Array::Handle(Array::New(3));
args.SetAt(0, length);
args.SetAt(1, Symbols::Length());
args.SetAt(2, String::Handle(String::New("is not an integer")));
Exceptions::ThrowByType(Exceptions::kArgumentValue, args);
}
if (length.IsSmi()) {
const intptr_t len = Smi::Cast(length).Value();
if ((len >= 0) && (len <= Array::kMaxElements)) {
const Array& array = Array::Handle(Array::New(len, Heap::kNew));
arguments.SetReturn(array);
TypeArguments& element_type =
TypeArguments::CheckedHandle(arguments.ArgAt(1));
// An Array is raw or takes one type argument. However, its type argument
// vector may be longer than 1 due to a type optimization reusing the type
// argument vector of the instantiator.
ASSERT(element_type.IsNull() ||
((element_type.Length() >= 1) && element_type.IsInstantiated()));
array.SetTypeArguments(element_type); // May be null.
EnsureNewOrRemembered(isolate, thread, array);
return;
}
}
// Throw: new RangeError.range(length, 0, Array::kMaxElements, "length");
const Array& args = Array::Handle(Array::New(4));
args.SetAt(0, length);
args.SetAt(1, Integer::Handle(Integer::New(0)));
args.SetAt(2, Integer::Handle(Integer::New(Array::kMaxElements)));
args.SetAt(3, Symbols::Length());
Exceptions::ThrowByType(Exceptions::kRange, args);
}
// Helper returning the token position of the Dart caller.
static TokenPosition GetCallerLocation() {
DartFrameIterator iterator(Thread::Current(),
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame != NULL);
return caller_frame->GetTokenPos();
}
// Allocate a new object.
// Arg0: class of the object that needs to be allocated.
// Arg1: type arguments of the object that needs to be allocated.
// Return value: newly allocated object.
DEFINE_RUNTIME_ENTRY(AllocateObject, 2) {
const Class& cls = Class::CheckedHandle(arguments.ArgAt(0));
#ifdef DEBUG
if (FLAG_gc_at_instance_allocation != NULL) {
const String& name = String::Handle(cls.Name());
if (String::EqualsIgnoringPrivateKey(
name,
String::Handle(String::New(FLAG_gc_at_instance_allocation)))) {
Isolate::Current()->heap()->CollectAllGarbage(Heap::kDebugging);
}
}
#endif
Heap::Space space = Heap::kNew;
const Instance& instance = Instance::Handle(Instance::New(cls, space));
arguments.SetReturn(instance);
if (cls.NumTypeArguments() == 0) {
// No type arguments required for a non-parameterized type.
ASSERT(Instance::CheckedHandle(arguments.ArgAt(1)).IsNull());
return;
}
TypeArguments& type_arguments =
TypeArguments::CheckedHandle(arguments.ArgAt(1));
// Unless null (for a raw type), the type argument vector may be longer than
// necessary due to a type optimization reusing the type argument vector of
// the instantiator.
ASSERT(type_arguments.IsNull() ||
(type_arguments.IsInstantiated() &&
(type_arguments.Length() >= cls.NumTypeArguments())));
instance.SetTypeArguments(type_arguments);
if (Heap::IsAllocatableInNewSpace(cls.instance_size())) {
EnsureNewOrRemembered(isolate, thread, instance);
}
}
// Instantiate type.
// Arg0: uninstantiated type.
// Arg1: instantiator type arguments.
// Arg2: function type arguments.
// Return value: instantiated type.
DEFINE_RUNTIME_ENTRY(InstantiateType, 3) {
AbstractType& type = AbstractType::CheckedHandle(zone, arguments.ArgAt(0));
const TypeArguments& instantiator_type_arguments =
TypeArguments::CheckedHandle(zone, arguments.ArgAt(1));
const TypeArguments& function_type_arguments =
TypeArguments::CheckedHandle(zone, arguments.ArgAt(2));
ASSERT(!type.IsNull() && !type.IsInstantiated());
ASSERT(instantiator_type_arguments.IsNull() ||
instantiator_type_arguments.IsInstantiated());
ASSERT(function_type_arguments.IsNull() ||
function_type_arguments.IsInstantiated());
Error& bound_error = Error::Handle(zone);
type =
type.InstantiateFrom(instantiator_type_arguments, function_type_arguments,
kAllFree, &bound_error, NULL, NULL, Heap::kOld);
if (!bound_error.IsNull()) {
// Throw a dynamic type error.
const TokenPosition location = GetCallerLocation();
String& bound_error_message =
String::Handle(zone, String::New(bound_error.ToErrorCString()));
Exceptions::CreateAndThrowTypeError(location, AbstractType::Handle(zone),
AbstractType::Handle(zone),
Symbols::Empty(), bound_error_message);
UNREACHABLE();
}
if (type.IsTypeRef()) {
type = TypeRef::Cast(type).type();
ASSERT(!type.IsTypeRef());
ASSERT(type.IsCanonical());
}
ASSERT(!type.IsNull() && type.IsInstantiated());
arguments.SetReturn(type);
}
// Instantiate type arguments.
// Arg0: uninstantiated type arguments.
// Arg1: instantiator type arguments.
// Arg2: function type arguments.
// Return value: instantiated type arguments.
DEFINE_RUNTIME_ENTRY(InstantiateTypeArguments, 3) {
TypeArguments& type_arguments =
TypeArguments::CheckedHandle(zone, arguments.ArgAt(0));
const TypeArguments& instantiator_type_arguments =
TypeArguments::CheckedHandle(zone, arguments.ArgAt(1));
const TypeArguments& function_type_arguments =
TypeArguments::CheckedHandle(zone, arguments.ArgAt(2));
ASSERT(!type_arguments.IsNull() && !type_arguments.IsInstantiated());
ASSERT(instantiator_type_arguments.IsNull() ||
instantiator_type_arguments.IsInstantiated());
ASSERT(function_type_arguments.IsNull() ||
function_type_arguments.IsInstantiated());
// Code inlined in the caller should have optimized the case where the
// instantiator can be reused as type argument vector.
ASSERT(!type_arguments.IsUninstantiatedIdentity());
if (isolate->type_checks()) {
Error& bound_error = Error::Handle(zone);
type_arguments = type_arguments.InstantiateAndCanonicalizeFrom(
instantiator_type_arguments, function_type_arguments, &bound_error);
if (!bound_error.IsNull()) {
// Throw a dynamic type error.
const TokenPosition location = GetCallerLocation();
String& bound_error_message =
String::Handle(zone, String::New(bound_error.ToErrorCString()));
Exceptions::CreateAndThrowTypeError(
location, AbstractType::Handle(zone), AbstractType::Handle(zone),
Symbols::Empty(), bound_error_message);
UNREACHABLE();
}
} else {
type_arguments = type_arguments.InstantiateAndCanonicalizeFrom(
instantiator_type_arguments, function_type_arguments, NULL);
}
ASSERT(type_arguments.IsNull() || type_arguments.IsInstantiated());
arguments.SetReturn(type_arguments);
}
// Instantiate type.
// Arg0: instantiator type arguments
// Arg1: function type arguments
// Arg2: type to be a subtype of the other
// Arg3: type to be a supertype of the other
// Arg4: variable name of the subtype parameter
// No return value.
DEFINE_RUNTIME_ENTRY(SubtypeCheck, 5) {
const TypeArguments& instantiator_type_args =
TypeArguments::CheckedHandle(zone, arguments.ArgAt(0));
const TypeArguments& function_type_args =
TypeArguments::CheckedHandle(zone, arguments.ArgAt(1));
AbstractType& subtype = AbstractType::CheckedHandle(zone, arguments.ArgAt(2));
AbstractType& supertype =
AbstractType::CheckedHandle(zone, arguments.ArgAt(3));
const String& dst_name = String::CheckedHandle(zone, arguments.ArgAt(4));
ASSERT(!subtype.IsNull() && !subtype.IsMalformedOrMalbounded());
ASSERT(!supertype.IsNull() && !supertype.IsMalformedOrMalbounded());
// The supertype or subtype may not be instantiated.
Error& bound_error = Error::Handle(zone);
if (AbstractType::InstantiateAndTestSubtype(
&subtype, &supertype, &bound_error, instantiator_type_args,
function_type_args)) {
return;
}
// Throw a dynamic type error.
const TokenPosition location = GetCallerLocation();
String& bound_error_message = String::Handle(zone);
if (!bound_error.IsNull()) {
bound_error_message = String::New(bound_error.ToErrorCString());
}
Exceptions::CreateAndThrowTypeError(location, subtype, supertype, dst_name,
bound_error_message);
UNREACHABLE();
}
// Allocate a new SubtypeTestCache for use in interpreted implicit setters.
// Return value: newly allocated SubtypeTestCache.
DEFINE_RUNTIME_ENTRY(AllocateSubtypeTestCache, 0) {
ASSERT(FLAG_enable_interpreter);
arguments.SetReturn(SubtypeTestCache::Handle(zone, SubtypeTestCache::New()));
}
// Allocate a new context large enough to hold the given number of variables.
// Arg0: number of variables.
// Return value: newly allocated context.
DEFINE_RUNTIME_ENTRY(AllocateContext, 1) {
const Smi& num_variables = Smi::CheckedHandle(zone, arguments.ArgAt(0));
const Context& context = Context::Handle(Context::New(num_variables.Value()));
arguments.SetReturn(context);
if (Heap::IsAllocatableInNewSpace(
Context::InstanceSize(num_variables.Value()))) {
EnsureNewOrRemembered(isolate, thread, context);
}
}
// Make a copy of the given context, including the values of the captured
// variables.
// Arg0: the context to be cloned.
// Return value: newly allocated context.
DEFINE_RUNTIME_ENTRY(CloneContext, 1) {
const Context& ctx = Context::CheckedHandle(zone, arguments.ArgAt(0));
Context& cloned_ctx =
Context::Handle(zone, Context::New(ctx.num_variables()));
cloned_ctx.set_parent(Context::Handle(ctx.parent()));
Object& inst = Object::Handle(zone);
for (int i = 0; i < ctx.num_variables(); i++) {
inst = ctx.At(i);
cloned_ctx.SetAt(i, inst);
}
arguments.SetReturn(cloned_ctx);
}
// Extract a method by allocating and initializing a new Closure.
// Arg0: receiver.
// Arg1: method.
// Return value: newly allocated Closure.
DEFINE_RUNTIME_ENTRY(ExtractMethod, 2) {
ASSERT(FLAG_enable_interpreter);
const Instance& receiver = Instance::CheckedHandle(zone, arguments.ArgAt(0));
const Function& method = Function::CheckedHandle(zone, arguments.ArgAt(1));
const TypeArguments& instantiator_type_arguments =
method.HasInstantiatedSignature(kCurrentClass)
? Object::null_type_arguments()
: TypeArguments::Handle(zone, receiver.GetTypeArguments());
ASSERT(method.HasInstantiatedSignature(kFunctions));
const Context& context = Context::Handle(zone, Context::New(1));
context.SetAt(0, receiver);
const Closure& closure = Closure::Handle(
zone,
Closure::New(instantiator_type_arguments, Object::null_type_arguments(),
Object::empty_type_arguments(), method, context));
arguments.SetReturn(closure);
}
// Result of an invoke may be an unhandled exception, in which case we
// rethrow it.
static void CheckResultError(const Object& result) {
if (result.IsError()) {
Exceptions::PropagateError(Error::Cast(result));
}
}
// Invoke field getter before dispatch.
// Arg0: instance.
// Arg1: field name.
// Return value: field value.
DEFINE_RUNTIME_ENTRY(GetFieldForDispatch, 2) {
ASSERT(FLAG_enable_interpreter);
const Instance& receiver = Instance::CheckedHandle(zone, arguments.ArgAt(0));
const String& name = String::CheckedHandle(zone, arguments.ArgAt(1));
const Class& receiver_class = Class::Handle(zone, receiver.clazz());
const String& getter_name = String::Handle(zone, Field::GetterName(name));
const int kTypeArgsLen = 0;
const int kNumArguments = 1;
ArgumentsDescriptor args_desc(Array::Handle(
zone, ArgumentsDescriptor::New(kTypeArgsLen, kNumArguments)));
const Function& getter =
Function::Handle(zone, Resolver::ResolveDynamicForReceiverClass(
receiver_class, getter_name, args_desc));
ASSERT(!getter.IsNull()); // An InvokeFieldDispatcher function was created.
const Array& args = Array::Handle(zone, Array::New(kNumArguments));
args.SetAt(0, receiver);
const Object& result =
Object::Handle(zone, DartEntry::InvokeFunction(getter, args));
CheckResultError(result);
arguments.SetReturn(result);
}
// Resolve 'call' function of receiver.
// Arg0: receiver (not a closure).
// Return value: 'call' function'.
DEFINE_RUNTIME_ENTRY(ResolveCallFunction, 1) {
ASSERT(FLAG_enable_interpreter);
const Instance& receiver = Instance::CheckedHandle(zone, arguments.ArgAt(0));
ASSERT(!receiver.IsClosure()); // Interpreter tests for closure.
Class& cls = Class::Handle(zone, receiver.clazz());
Function& call_function = Function::Handle(zone);
do {
call_function = cls.LookupDynamicFunction(Symbols::Call());
if (!call_function.IsNull()) {
break;
}
cls = cls.SuperClass();
} while (!cls.IsNull());
arguments.SetReturn(call_function);
}
// Helper routine for tracing a type check.
static void PrintTypeCheck(const char* message,
const Instance& instance,
const AbstractType& type,
const TypeArguments& instantiator_type_arguments,
const TypeArguments& function_type_arguments,
const Bool& result) {
DartFrameIterator iterator(Thread::Current(),
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame != NULL);
const AbstractType& instance_type =
AbstractType::Handle(instance.GetType(Heap::kNew));
ASSERT(instance_type.IsInstantiated() ||
(instance.IsClosure() && instance_type.IsInstantiated(kCurrentClass)));
if (type.IsInstantiated()) {
OS::PrintErr("%s: '%s' %" Pd " %s '%s' %" Pd " (pc: %#" Px ").\n", message,
String::Handle(instance_type.Name()).ToCString(),
Class::Handle(instance_type.type_class()).id(),
(result.raw() == Bool::True().raw()) ? "is" : "is !",
String::Handle(type.Name()).ToCString(),
Class::Handle(type.type_class()).id(), caller_frame->pc());
} else {
// Instantiate type before printing.
Error& bound_error = Error::Handle();
const AbstractType& instantiated_type =
AbstractType::Handle(type.InstantiateFrom(
instantiator_type_arguments, function_type_arguments, kAllFree,
&bound_error, NULL, NULL, Heap::kOld));
OS::PrintErr("%s: '%s' %s '%s' instantiated from '%s' (pc: %#" Px ").\n",
message, String::Handle(instance_type.Name()).ToCString(),
(result.raw() == Bool::True().raw()) ? "is" : "is !",
String::Handle(instantiated_type.Name()).ToCString(),
String::Handle(type.Name()).ToCString(), caller_frame->pc());
if (!bound_error.IsNull()) {
OS::PrintErr(" bound error: %s\n", bound_error.ToErrorCString());
}
}
const Function& function =
Function::Handle(caller_frame->LookupDartFunction());
OS::PrintErr(" -> Function %s\n", function.ToFullyQualifiedCString());
}
// This updates the type test cache, an array containing 5-value elements
// (instance class (or function if the instance is a closure), instance type
// arguments, instantiator type arguments, function type arguments,
// and test_result). It can be applied to classes with type arguments in which
// case it contains just the result of the class subtype test, not including the
// evaluation of type arguments.
// This operation is currently very slow (lookup of code is not efficient yet).
static void UpdateTypeTestCache(
Zone* zone,
const Instance& instance,
const AbstractType& type,
const TypeArguments& instantiator_type_arguments,
const TypeArguments& function_type_arguments,
const Bool& result,
const SubtypeTestCache& new_cache) {
// Since the test is expensive, don't do it unless necessary.
// The list of disallowed cases will decrease as they are implemented in
// inlined assembly.
if (new_cache.IsNull()) {
if (FLAG_trace_type_checks) {
OS::PrintErr("UpdateTypeTestCache: cache is null\n");
}
return;
}
if (instance.IsSmi()) {
if (FLAG_trace_type_checks) {
OS::PrintErr("UpdateTypeTestCache: instance is Smi\n");
}
return;
}
// If the type is uninstantiated and refers to parent function type
// parameters, the function_type_arguments have been canonicalized
// when concatenated.
ASSERT(function_type_arguments.IsNull() ||
function_type_arguments.IsCanonical());
const Class& instance_class = Class::Handle(zone, instance.clazz());
auto& instance_class_id_or_function = Object::Handle(zone);
auto& instance_type_arguments = TypeArguments::Handle(zone);
auto& instance_parent_function_type_arguments = TypeArguments::Handle(zone);
auto& instance_delayed_type_arguments = TypeArguments::Handle(zone);
if (instance_class.IsClosureClass()) {
const auto& closure = Closure::Cast(instance);
const auto& closure_function = Function::Handle(zone, closure.function());
instance_class_id_or_function = closure_function.raw();
instance_type_arguments = closure.instantiator_type_arguments();
instance_parent_function_type_arguments = closure.function_type_arguments();
instance_delayed_type_arguments = closure.delayed_type_arguments();
} else {
instance_class_id_or_function = Smi::New(instance_class.id());
if (instance_class.NumTypeArguments() > 0) {
instance_type_arguments = instance.GetTypeArguments();
}
}
const intptr_t len = new_cache.NumberOfChecks();
if (len >= FLAG_max_subtype_cache_entries) {
return;
}
#if defined(DEBUG)
ASSERT(instance_type_arguments.IsNull() ||
instance_type_arguments.IsCanonical());
ASSERT(instantiator_type_arguments.IsNull() ||
instantiator_type_arguments.IsCanonical());
ASSERT(function_type_arguments.IsNull() ||
function_type_arguments.IsCanonical());
ASSERT(instance_parent_function_type_arguments.IsNull() ||
instance_parent_function_type_arguments.IsCanonical());
ASSERT(instance_delayed_type_arguments.IsNull() ||
instance_delayed_type_arguments.IsCanonical());
auto& last_instance_class_id_or_function = Object::Handle(zone);
auto& last_instance_type_arguments = TypeArguments::Handle(zone);
auto& last_instantiator_type_arguments = TypeArguments::Handle(zone);
auto& last_function_type_arguments = TypeArguments::Handle(zone);
auto& last_instance_parent_function_type_arguments =
TypeArguments::Handle(zone);
auto& last_instance_delayed_type_arguments = TypeArguments::Handle(zone);
Bool& last_result = Bool::Handle(zone);
for (intptr_t i = 0; i < len; ++i) {
new_cache.GetCheck(
i, &last_instance_class_id_or_function, &last_instance_type_arguments,
&last_instantiator_type_arguments, &last_function_type_arguments,
&last_instance_parent_function_type_arguments,
&last_instance_delayed_type_arguments, &last_result);
if ((last_instance_class_id_or_function.raw() ==
instance_class_id_or_function.raw()) &&
(last_instance_type_arguments.raw() == instance_type_arguments.raw()) &&
(last_instantiator_type_arguments.raw() ==
instantiator_type_arguments.raw()) &&
(last_function_type_arguments.raw() == function_type_arguments.raw()) &&
(last_instance_parent_function_type_arguments.raw() ==
instance_parent_function_type_arguments.raw()) &&
(last_instance_delayed_type_arguments.raw() ==
instance_delayed_type_arguments.raw())) {
OS::PrintErr(" Error in test cache %p ix: %" Pd ",", new_cache.raw(), i);
PrintTypeCheck(" duplicate cache entry", instance, type,
instantiator_type_arguments, function_type_arguments,
result);
UNREACHABLE();
return;
}
}
#endif
new_cache.AddCheck(instance_class_id_or_function, instance_type_arguments,
instantiator_type_arguments, function_type_arguments,
instance_parent_function_type_arguments,
instance_delayed_type_arguments, result);
if (FLAG_trace_type_checks) {
AbstractType& test_type = AbstractType::Handle(zone, type.raw());
if (!test_type.IsInstantiated()) {
Error& bound_error = Error::Handle(zone);
test_type = type.InstantiateFrom(instantiator_type_arguments,
function_type_arguments, kAllFree,
&bound_error, NULL, NULL, Heap::kNew);
ASSERT(bound_error.IsNull()); // Malbounded types are not optimized.
}
const auto& type_class = Class::Handle(zone, test_type.type_class());
const auto& instance_class_name =
String::Handle(zone, instance_class.Name());
OS::PrintErr(
" Updated test cache %p ix: %" Pd
" with "
"(cid-or-fun: %p, type-args: %p, i-type-args: %p, f-type-args: %p, "
"result: %s)\n"
" instance [class: (%p '%s' cid: %" Pd
"), type-args: %p %s]\n"
" test-type [class: (%p '%s' cid: %" Pd
"), i-type-args: %p %s, f-type-args: %p %s]\n",
new_cache.raw(), len, instance_class_id_or_function.raw(),
instance_type_arguments.raw(), instantiator_type_arguments.raw(),
instantiator_type_arguments.raw(), result.ToCString(),
instance_class.raw(), instance_class_name.ToCString(),
instance_class.id(), instance_type_arguments.raw(),
instance_type_arguments.ToCString(), type_class.raw(),
String::Handle(zone, type_class.Name()).ToCString(), type_class.id(),
instantiator_type_arguments.raw(),
instantiator_type_arguments.ToCString(), function_type_arguments.raw(),
function_type_arguments.ToCString());
}
}
// Check that the given instance is an instance of the given type.
// Tested instance may not be null, because the null test is inlined.
// Arg0: instance being checked.
// Arg1: type.
// Arg2: type arguments of the instantiator of the type.
// Arg3: type arguments of the function of the type.
// Arg4: SubtypeTestCache.
// Return value: true or false, or may throw a type error in checked mode.
DEFINE_RUNTIME_ENTRY(Instanceof, 5) {
const Instance& instance = Instance::CheckedHandle(zone, arguments.ArgAt(0));
const AbstractType& type =
AbstractType::CheckedHandle(zone, arguments.ArgAt(1));
const TypeArguments& instantiator_type_arguments =
TypeArguments::CheckedHandle(zone, arguments.ArgAt(2));
const TypeArguments& function_type_arguments =
TypeArguments::CheckedHandle(zone, arguments.ArgAt(3));
const SubtypeTestCache& cache =
SubtypeTestCache::CheckedHandle(zone, arguments.ArgAt(4));
ASSERT(type.IsFinalized());
ASSERT(!type.IsMalformed()); // Already checked in code generator.
ASSERT(!type.IsMalbounded()); // Already checked in code generator.
ASSERT(!type.IsDynamicType()); // No need to check assignment.
Error& bound_error = Error::Handle(zone);
const Bool& result =
Bool::Get(instance.IsInstanceOf(type, instantiator_type_arguments,
function_type_arguments, &bound_error));
if (FLAG_trace_type_checks) {
PrintTypeCheck("InstanceOf", instance, type, instantiator_type_arguments,
function_type_arguments, result);
}
if (!result.value() && !bound_error.IsNull()) {
// Throw a dynamic type error only if the instanceof test fails.
const TokenPosition location = GetCallerLocation();
String& bound_error_message =
String::Handle(zone, String::New(bound_error.ToErrorCString()));
Exceptions::CreateAndThrowTypeError(location, AbstractType::Handle(zone),
AbstractType::Handle(zone),
Symbols::Empty(), bound_error_message);
UNREACHABLE();
}
UpdateTypeTestCache(zone, instance, type, instantiator_type_arguments,
function_type_arguments, result, cache);
arguments.SetReturn(result);
}
// Check that the type of the given instance is a subtype of the given type and
// can therefore be assigned.
// Arg0: instance being assigned.
// Arg1: type being assigned to.
// Arg2: type arguments of the instantiator of the type being assigned to.
// Arg3: type arguments of the function of the type being assigned to.
// Arg4: name of variable being assigned to.
// Arg5: SubtypeTestCache.
// Arg6: invocation mode (see TypeCheckMode)
// Return value: instance if a subtype, otherwise throw a TypeError.
DEFINE_RUNTIME_ENTRY(TypeCheck, 7) {
const Instance& src_instance =
Instance::CheckedHandle(zone, arguments.ArgAt(0));
AbstractType& dst_type =
AbstractType::CheckedHandle(zone, arguments.ArgAt(1));
const TypeArguments& instantiator_type_arguments =
TypeArguments::CheckedHandle(zone, arguments.ArgAt(2));
const TypeArguments& function_type_arguments =
TypeArguments::CheckedHandle(zone, arguments.ArgAt(3));
String& dst_name = String::Handle(zone);
dst_name ^= arguments.ArgAt(4);
ASSERT(dst_name.IsNull() || dst_name.IsString());
SubtypeTestCache& cache = SubtypeTestCache::Handle(zone);
cache ^= arguments.ArgAt(5);
ASSERT(cache.IsNull() || cache.IsSubtypeTestCache());
const TypeCheckMode mode = static_cast<TypeCheckMode>(
Smi::CheckedHandle(zone, arguments.ArgAt(6)).Value());
#if defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_DBC)
ASSERT(mode == kTypeCheckFromInline);
#endif
ASSERT(!dst_type.IsMalformed()); // Already checked in code generator.
ASSERT(!dst_type.IsMalbounded()); // Already checked in code generator.
ASSERT(!dst_type.IsDynamicType()); // No need to check assignment.
ASSERT(!src_instance.IsNull()); // Already checked in inlined code.
Error& bound_error = Error::Handle(zone);
const bool is_instance_of =
src_instance.IsInstanceOf(dst_type, instantiator_type_arguments,
function_type_arguments, &bound_error);
if (FLAG_trace_type_checks) {
PrintTypeCheck("TypeCheck", src_instance, dst_type,
instantiator_type_arguments, function_type_arguments,
Bool::Get(is_instance_of));
}
if (!is_instance_of) {
// Throw a dynamic type error.
const TokenPosition location = GetCallerLocation();
const AbstractType& src_type =
AbstractType::Handle(zone, src_instance.GetType(Heap::kNew));
if (!dst_type.IsInstantiated()) {
// Instantiate dst_type before reporting the error.
dst_type = dst_type.InstantiateFrom(instantiator_type_arguments,
function_type_arguments, kAllFree,
NULL, NULL, NULL, Heap::kNew);
// Note that instantiated dst_type may be malbounded.
}
String& bound_error_message = String::Handle(zone);
if (!bound_error.IsNull()) {
ASSERT(isolate->type_checks());
bound_error_message = String::New(bound_error.ToErrorCString());
}
if (dst_name.IsNull()) {
#if !defined(TARGET_ARCH_DBC) && !defined(TARGET_ARCH_IA32)
// Can only come here from type testing stub.
ASSERT(mode != kTypeCheckFromInline);
// Grab the [dst_name] from the pool. It's stored at one pool slot after
// the subtype-test-cache.
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
const Code& caller_code =
Code::Handle(zone, caller_frame->LookupDartCode());
const ObjectPool& pool =
ObjectPool::Handle(zone, caller_code.object_pool());
TypeTestingStubCallPattern tts_pattern(caller_frame->pc());
const intptr_t stc_pool_idx = tts_pattern.GetSubtypeTestCachePoolIndex();
const intptr_t dst_name_idx = stc_pool_idx + 1;
dst_name ^= pool.ObjectAt(dst_name_idx);
#else
UNREACHABLE();
#endif
}
Exceptions::CreateAndThrowTypeError(location, src_type, dst_type, dst_name,
bound_error_message);
UNREACHABLE();
}
bool should_update_cache = true;
#if !defined(TARGET_ARCH_DBC) && !defined(TARGET_ARCH_IA32) && \
!defined(DART_PRECOMPILED_RUNTIME)
if (mode == kTypeCheckFromLazySpecializeStub) {
TypeTestingStubGenerator::SpecializeStubFor(thread, dst_type);
// Only create the cache when we come from a normal stub.
should_update_cache = false;
}
#endif
if (should_update_cache) {
if (cache.IsNull()) {
#if !defined(TARGET_ARCH_DBC) && !defined(TARGET_ARCH_IA32)
ASSERT(mode == kTypeCheckFromSlowStub);
// We lazily create [SubtypeTestCache] for those call sites which actually
// need one and will patch the pool entry.
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
const Code& caller_code =
Code::Handle(zone, caller_frame->LookupDartCode());
const ObjectPool& pool =
ObjectPool::Handle(zone, caller_code.object_pool());
TypeTestingStubCallPattern tts_pattern(caller_frame->pc());
const intptr_t stc_pool_idx = tts_pattern.GetSubtypeTestCachePoolIndex();
// The pool entry must be initialized to `null` when we patch it.
ASSERT(pool.ObjectAt(stc_pool_idx) == Object::null());
cache = SubtypeTestCache::New();
pool.SetObjectAt(stc_pool_idx, cache);
#else
UNREACHABLE();
#endif
}
UpdateTypeTestCache(zone, src_instance, dst_type,
instantiator_type_arguments, function_type_arguments,
Bool::True(), cache);
}
arguments.SetReturn(src_instance);
}
// Report that the type of the given object is not bool in conditional context.
// Throw assertion error if the object is null. (cf. Boolean Conversion
// in language Spec.)
// Arg0: bad object.
// Return value: none, throws TypeError or AssertionError.
DEFINE_RUNTIME_ENTRY(NonBoolTypeError, 1) {
const TokenPosition location = GetCallerLocation();
const Instance& src_instance =
Instance::CheckedHandle(zone, arguments.ArgAt(0));
if (src_instance.IsNull()) {
const Array& args = Array::Handle(zone, Array::New(5));
args.SetAt(
0, String::Handle(
zone,
String::New(
"Failed assertion: boolean expression must not be null")));
// No source code for this assertion, set url to null.
args.SetAt(1, String::Handle(zone, String::null()));
args.SetAt(2, Smi::Handle(zone, Smi::New(0)));
args.SetAt(3, Smi::Handle(zone, Smi::New(0)));
args.SetAt(4, String::Handle(zone, String::null()));
Exceptions::ThrowByType(Exceptions::kAssertion, args);
UNREACHABLE();
}
ASSERT(!src_instance.IsBool());
const Type& bool_interface = Type::Handle(Type::BoolType());
const AbstractType& src_type =
AbstractType::Handle(zone, src_instance.GetType(Heap::kNew));
const String& no_bound_error = String::Handle(zone);
Exceptions::CreateAndThrowTypeError(location, src_type, bool_interface,
Symbols::BooleanExpression(),
no_bound_error);
UNREACHABLE();
}
// Report that the type of the type check is malformed or malbounded.
// Arg0: src value.
// Arg1: name of destination being assigned to.
// Arg2: type of destination being assigned to.
// Return value: none, throws an exception.
DEFINE_RUNTIME_ENTRY(BadTypeError, 3) {
const TokenPosition location = GetCallerLocation();
const Instance& src_value = Instance::CheckedHandle(zone, arguments.ArgAt(0));
const String& dst_name = String::CheckedHandle(zone, arguments.ArgAt(1));
const AbstractType& dst_type =
AbstractType::CheckedHandle(zone, arguments.ArgAt(2));
const AbstractType& src_type =
AbstractType::Handle(zone, src_value.GetType(Heap::kNew));
Exceptions::CreateAndThrowTypeError(location, src_type, dst_type, dst_name,
String::Handle(zone));
UNREACHABLE();
}
DEFINE_RUNTIME_ENTRY(Throw, 1) {
const Instance& exception = Instance::CheckedHandle(zone, arguments.ArgAt(0));
Exceptions::Throw(thread, exception);
}
DEFINE_RUNTIME_ENTRY(ReThrow, 2) {
const Instance& exception = Instance::CheckedHandle(zone, arguments.ArgAt(0));
const Instance& stacktrace =
Instance::CheckedHandle(zone, arguments.ArgAt(1));
Exceptions::ReThrow(thread, exception, stacktrace);
}
// Patches static call in optimized code with the target's entry point.
// Compiles target if necessary.
DEFINE_RUNTIME_ENTRY(PatchStaticCall, 0) {
#if !defined(DART_PRECOMPILED_RUNTIME)
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame != NULL);
const Code& caller_code = Code::Handle(zone, caller_frame->LookupDartCode());
ASSERT(!caller_code.IsNull());
ASSERT(caller_code.is_optimized());
const Function& target_function = Function::Handle(
zone, caller_code.GetStaticCallTargetFunctionAt(caller_frame->pc()));
const Code& target_code = Code::Handle(zone, target_function.EnsureHasCode());
// Before patching verify that we are not repeatedly patching to the same
// target.
ASSERT(target_code.raw() !=
CodePatcher::GetStaticCallTargetAt(caller_frame->pc(), caller_code));
CodePatcher::PatchStaticCallAt(caller_frame->pc(), caller_code, target_code);
caller_code.SetStaticCallTargetCodeAt(caller_frame->pc(), target_code);
if (FLAG_trace_patching) {
THR_Print("PatchStaticCall: patching caller pc %#" Px
""
" to '%s' new entry point %#" Px " (%s)\n",
caller_frame->pc(), target_function.ToFullyQualifiedCString(),
target_code.EntryPoint(),
target_code.is_optimized() ? "optimized" : "unoptimized");
}
arguments.SetReturn(target_code);
#else
UNREACHABLE();
#endif
}
#if defined(PRODUCT) || defined(DART_PRECOMPILED_RUNTIME)
DEFINE_RUNTIME_ENTRY(BreakpointRuntimeHandler, 0) {
UNREACHABLE();
return;
}
#elif !defined(TARGET_ARCH_DBC)
// Gets called from debug stub when code reaches a breakpoint
// set on a runtime stub call.
DEFINE_RUNTIME_ENTRY(BreakpointRuntimeHandler, 0) {
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame != NULL);
const Code& orig_stub = Code::Handle(
zone, isolate->debugger()->GetPatchedStubAddress(caller_frame->pc()));
const Error& error =
Error::Handle(zone, isolate->debugger()->PauseBreakpoint());
if (!error.IsNull()) {
Exceptions::PropagateError(error);
UNREACHABLE();
}
arguments.SetReturn(orig_stub);
}
#else
// Gets called from the simulator when the breakpoint is reached.
DEFINE_RUNTIME_ENTRY(BreakpointRuntimeHandler, 0) {
const Error& error = Error::Handle(isolate->debugger()->PauseBreakpoint());
if (!error.IsNull()) {
Exceptions::PropagateError(error);
UNREACHABLE();
}
}
#endif // !defined(TARGET_ARCH_DBC)
DEFINE_RUNTIME_ENTRY(SingleStepHandler, 0) {
#if defined(PRODUCT) || defined(DART_PRECOMPILED_RUNTIME)
UNREACHABLE();
#else
const Error& error =
Error::Handle(zone, isolate->debugger()->PauseStepping());
if (!error.IsNull()) {
Exceptions::PropagateError(error);
UNREACHABLE();
}
#endif
}
// An instance call of the form o.f(...) could not be resolved. Check if
// there is a getter with the same name. If so, invoke it. If the value is
// a closure, invoke it with the given arguments. If the value is a
// non-closure, attempt to invoke "call" on it.
static bool ResolveCallThroughGetter(const Instance& receiver,
const Class& receiver_class,
const String& target_name,
const Array& arguments_descriptor,
Function* result) {
// 1. Check if there is a getter with the same name.
const String& getter_name = String::Handle(Field::GetterName(target_name));
const int kTypeArgsLen = 0;
const int kNumArguments = 1;
ArgumentsDescriptor args_desc(
Array::Handle(ArgumentsDescriptor::New(kTypeArgsLen, kNumArguments)));
const Function& getter =
Function::Handle(Resolver::ResolveDynamicForReceiverClass(
receiver_class, getter_name, args_desc));
if (getter.IsNull() || getter.IsMethodExtractor()) {
return false;
}
const Function& target_function =
Function::Handle(receiver_class.GetInvocationDispatcher(
target_name, arguments_descriptor,
RawFunction::kInvokeFieldDispatcher, FLAG_lazy_dispatchers));
ASSERT(!target_function.IsNull() || !FLAG_lazy_dispatchers);
if (FLAG_trace_ic) {
OS::PrintErr(
"InvokeField IC miss: adding <%s> id:%" Pd " -> <%s>\n",
Class::Handle(receiver.clazz()).ToCString(), receiver.GetClassId(),
target_function.IsNull() ? "null" : target_function.ToCString());
}
*result = target_function.raw();
return true;
}
// Handle other invocations (implicit closures, noSuchMethod).
RawFunction* InlineCacheMissHelper(const Instance& receiver,
const Array& args_descriptor,
const String& target_name) {
const Class& receiver_class = Class::Handle(receiver.clazz());
// Handle noSuchMethod for dyn:methodName by getting a noSuchMethod dispatcher
// (or a call-through getter for methodName).
if (Function::IsDynamicInvocationForwaderName(target_name)) {
const String& demangled = String::Handle(
Function::DemangleDynamicInvocationForwarderName(target_name));
return InlineCacheMissHelper(receiver, args_descriptor, demangled);
}
Function& result = Function::Handle();
if (!ResolveCallThroughGetter(receiver, receiver_class, target_name,
args_descriptor, &result)) {
ArgumentsDescriptor desc(args_descriptor);
const Function& target_function =
Function::Handle(receiver_class.GetInvocationDispatcher(
target_name, args_descriptor, RawFunction::kNoSuchMethodDispatcher,
FLAG_lazy_dispatchers));
if (FLAG_trace_ic) {
OS::PrintErr(
"NoSuchMethod IC miss: adding <%s> id:%" Pd " -> <%s>\n",
Class::Handle(receiver.clazz()).ToCString(), receiver.GetClassId(),
target_function.IsNull() ? "null" : target_function.ToCString());
}
result = target_function.raw();
}
// May be null if --no-lazy-dispatchers, in which case dispatch will be
// handled by InvokeNoSuchMethodDispatcher.
ASSERT(!result.IsNull() || !FLAG_lazy_dispatchers);
return result.raw();
}
// Perform the subtype and return constant function based on the result.
static RawFunction* ComputeTypeCheckTarget(const Instance& receiver,
const AbstractType& type,
const ArgumentsDescriptor& desc) {
Error& error = Error::Handle();
bool result = receiver.IsInstanceOf(type, Object::null_type_arguments(),
Object::null_type_arguments(), &error);
ASSERT(error.IsNull());
ObjectStore* store = Isolate::Current()->object_store();
const Function& target =
Function::Handle(result ? store->simple_instance_of_true_function()
: store->simple_instance_of_false_function());
ASSERT(!target.IsNull());
return target.raw();
}
static RawFunction* InlineCacheMissHandler(
const GrowableArray<const Instance*>& args, // Checked arguments only.
const ICData& ic_data) {
const Instance& receiver = *args[0];
ArgumentsDescriptor arguments_descriptor(
Array::Handle(ic_data.arguments_descriptor()));
String& function_name = String::Handle(ic_data.target_name());
ASSERT(function_name.IsSymbol());
Function& target_function = Function::Handle(
Resolver::ResolveDynamic(receiver, function_name, arguments_descriptor));
ObjectStore* store = Isolate::Current()->object_store();
if (target_function.raw() == store->simple_instance_of_function()) {
// Replace the target function with constant function.
ASSERT(args.length() == 2);
const AbstractType& type = AbstractType::Cast(*args[1]);
target_function =
ComputeTypeCheckTarget(receiver, type, arguments_descriptor);
}
if (target_function.IsNull()) {
if (FLAG_trace_ic) {
OS::PrintErr("InlineCacheMissHandler NULL function for %s receiver: %s\n",
String::Handle(ic_data.target_name()).ToCString(),
receiver.ToCString());
}
const Array& args_descriptor =
Array::Handle(ic_data.arguments_descriptor());
const String& target_name = String::Handle(ic_data.target_name());
target_function =
InlineCacheMissHelper(receiver, args_descriptor, target_name);
}
if (target_function.IsNull()) {
ASSERT(!FLAG_lazy_dispatchers);
return target_function.raw();
}
if (args.length() == 1) {
if (ic_data.IsTrackingExactness()) {
#if !defined(DART_PRECOMPILED_RUNTIME)
const auto& receiver = *args[0];
const auto state = StaticTypeExactnessState::Compute(
Type::Cast(AbstractType::Handle(ic_data.StaticReceiverType())),
receiver);
ic_data.AddReceiverCheck(
receiver.GetClassId(), target_function,
/*count=*/1, /*exactness=*/state.CollapseSuperTypeExactness());
#else
UNREACHABLE();
#endif
} else {
ic_data.AddReceiverCheck(args[0]->GetClassId(), target_function);
}
} else {
GrowableArray<intptr_t> class_ids(args.length());
ASSERT(ic_data.NumArgsTested() == args.length());
for (intptr_t i = 0; i < args.length(); i++) {
class_ids.Add(args[i]->GetClassId());
}
ic_data.AddCheck(class_ids, target_function);
}
if (FLAG_trace_ic_miss_in_optimized || FLAG_trace_ic) {
DartFrameIterator iterator(Thread::Current(),
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame != NULL);
if (FLAG_trace_ic_miss_in_optimized) {
const Code& caller = Code::Handle(Code::LookupCode(caller_frame->pc()));
if (caller.is_optimized()) {
OS::PrintErr("IC miss in optimized code; call %s -> %s\n",
Function::Handle(caller.function()).ToCString(),
target_function.ToCString());
}
}
if (FLAG_trace_ic) {
OS::PrintErr("InlineCacheMissHandler %" Pd " call at %#" Px
"' "
"adding <%s> id:%" Pd " -> <%s>\n",
args.length(), caller_frame->pc(),
Class::Handle(receiver.clazz()).ToCString(),
receiver.GetClassId(), target_function.ToCString());
}
}
return target_function.raw();
}
// Handles inline cache misses by updating the IC data array of the call site.
// Arg0: Receiver object.
// Arg1: IC data object.
// Returns: target function with compiled code or null.
// Modifies the instance call to hold the updated IC data array.
DEFINE_RUNTIME_ENTRY(InlineCacheMissHandlerOneArg, 2) {
const Instance& receiver = Instance::CheckedHandle(arguments.ArgAt(0));
const ICData& ic_data = ICData::CheckedHandle(arguments.ArgAt(1));
GrowableArray<const Instance*> args(1);
args.Add(&receiver);
const Function& result =
Function::Handle(InlineCacheMissHandler(args, ic_data));
arguments.SetReturn(result);
}
// Handles inline cache misses by updating the IC data array of the call site.
// Arg0: Receiver object.
// Arg1: Argument after receiver.
// Arg2: IC data object.
// Returns: target function with compiled code or null.
// Modifies the instance call to hold the updated IC data array.
DEFINE_RUNTIME_ENTRY(InlineCacheMissHandlerTwoArgs, 3) {
const Instance& receiver = Instance::CheckedHandle(arguments.ArgAt(0));
const Instance& other = Instance::CheckedHandle(arguments.ArgAt(1));
const ICData& ic_data = ICData::CheckedHandle(arguments.ArgAt(2));
GrowableArray<const Instance*> args(2);
args.Add(&receiver);
args.Add(&other);
const Function& result =
Function::Handle(InlineCacheMissHandler(args, ic_data));
arguments.SetReturn(result);
}
// Handles a static call in unoptimized code that has one argument type not
// seen before. Compile the target if necessary and update the ICData.
// Arg0: argument.
// Arg1: IC data object.
DEFINE_RUNTIME_ENTRY(StaticCallMissHandlerOneArg, 2) {
const Instance& arg = Instance::CheckedHandle(arguments.ArgAt(0));
const ICData& ic_data = ICData::CheckedHandle(arguments.ArgAt(1));
// IC data for static call is prepopulated with the statically known target.
ASSERT(ic_data.NumberOfChecksIs(1));
const Function& target = Function::Handle(ic_data.GetTargetAt(0));
target.EnsureHasCode();
ASSERT(!target.IsNull() && target.HasCode());
ic_data.AddReceiverCheck(arg.GetClassId(), target, 1);
if (FLAG_trace_ic) {
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame != NULL);
OS::PrintErr("StaticCallMissHandler at %#" Px " target %s (%" Pd ")\n",
caller_frame->pc(), target.ToCString(), arg.GetClassId());
}
arguments.SetReturn(target);
}
// Handles a static call in unoptimized code that has two argument types not
// seen before. Compile the target if necessary and update the ICData.
// Arg0: argument 0.
// Arg1: argument 1.
// Arg2: IC data object.
DEFINE_RUNTIME_ENTRY(StaticCallMissHandlerTwoArgs, 3) {
const Instance& arg0 = Instance::CheckedHandle(arguments.ArgAt(0));
const Instance& arg1 = Instance::CheckedHandle(arguments.ArgAt(1));
const ICData& ic_data = ICData::CheckedHandle(arguments.ArgAt(2));
// IC data for static call is prepopulated with the statically known target.
ASSERT(!ic_data.NumberOfChecksIs(0));
const Function& target = Function::Handle(ic_data.GetTargetAt(0));
target.EnsureHasCode();
GrowableArray<intptr_t> cids(2);
cids.Add(arg0.GetClassId());
cids.Add(arg1.GetClassId());
ic_data.AddCheck(cids, target);
if (FLAG_trace_ic) {
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame != NULL);
OS::PrintErr("StaticCallMissHandler at %#" Px " target %s (%" Pd ", %" Pd
")\n",
caller_frame->pc(), target.ToCString(), cids[0], cids[1]);
}
arguments.SetReturn(target);
}
#if !defined(TARGET_ARCH_DBC)
static bool IsSingleTarget(Isolate* isolate,
Zone* zone,
intptr_t lower_cid,
intptr_t upper_cid,
const Function& target,
const String& name) {
Class& cls = Class::Handle(zone);
ClassTable* table = isolate->class_table();
Function& other_target = Function::Handle(zone);
for (intptr_t cid = lower_cid; cid <= upper_cid; cid++) {
if (!table->HasValidClassAt(cid)) continue;
cls = table->At(cid);
if (cls.is_abstract()) continue;
if (!cls.is_allocated()) continue;
other_target =
Resolver::ResolveDynamicAnyArgs(zone, cls, name, false /* allow_add */);
if (other_target.raw() != target.raw()) {
return false;
}
}
return true;
}
#endif
// Handle a miss of a single target cache.
// Arg0: Receiver.
// Returns: the ICData used to continue with a polymorphic call.
DEFINE_RUNTIME_ENTRY(SingleTargetMiss, 1) {
#if defined(TARGET_ARCH_DBC)
// DBC does not use switchable calls.
UNREACHABLE();
#else
const Instance& receiver = Instance::CheckedHandle(zone, arguments.ArgAt(0));
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame->IsDartFrame());
const Code& caller_code = Code::Handle(zone, caller_frame->LookupDartCode());
const Function& caller_function =
Function::Handle(zone, caller_frame->LookupDartFunction());
SingleTargetCache& cache = SingleTargetCache::Handle(zone);
cache ^=
CodePatcher::GetSwitchableCallDataAt(caller_frame->pc(), caller_code);
Code& old_target_code = Code::Handle(zone, cache.target());
Function& old_target = Function::Handle(zone);
old_target ^= old_target_code.owner();
// We lost the original ICData when we patched to the monomorphic case.
const String& name = String::Handle(zone, old_target.name());
ASSERT(!old_target.HasOptionalParameters());
ASSERT(!old_target.IsGeneric());
const int kTypeArgsLen = 0;
const Array& descriptor =
Array::Handle(zone, ArgumentsDescriptor::New(
kTypeArgsLen, old_target.num_fixed_parameters()));
const ICData& ic_data =
ICData::Handle(zone, ICData::New(caller_function, name, descriptor,
DeoptId::kNone, 1, /* args_tested */
ICData::kInstance));
// Maybe add the new target.
Class& cls = Class::Handle(zone, receiver.clazz());
ArgumentsDescriptor args_desc(descriptor);
Function& target_function = Function::Handle(
zone, Resolver::ResolveDynamicForReceiverClass(cls, name, args_desc));
if (target_function.IsNull()) {
target_function = InlineCacheMissHelper(receiver, descriptor, name);
}
if (target_function.IsNull()) {
ASSERT(!FLAG_lazy_dispatchers);
} else {
ic_data.AddReceiverCheck(receiver.GetClassId(), target_function);
}
if (old_target.raw() == target_function.raw()) {
intptr_t lower, upper, unchecked_lower, unchecked_upper;
if (receiver.GetClassId() < cache.lower_limit()) {
lower = receiver.GetClassId();
unchecked_lower = receiver.GetClassId();
upper = cache.upper_limit();
unchecked_upper = cache.lower_limit() - 1;
} else {
lower = cache.lower_limit();
unchecked_lower = cache.upper_limit() + 1;
upper = receiver.GetClassId();
unchecked_upper = receiver.GetClassId();
}
if (IsSingleTarget(isolate, zone, unchecked_lower, unchecked_upper,
target_function, name)) {
cache.set_lower_limit(lower);
cache.set_upper_limit(upper);
// Return the ICData. The single target stub will jump to continue in the
// IC call stub.
arguments.SetReturn(ic_data);
return;
}
}
// Call site is not single target, switch to call using ICData.
const Code& stub =
Code::Handle(zone, StubCode::ICCallThroughCode_entry()->code());
ASSERT(!Isolate::Current()->compilation_allowed());
CodePatcher::PatchSwitchableCallAt(caller_frame->pc(), caller_code, ic_data,
stub);
// Return the ICData. The single target stub will jump to continue in the
// IC call stub.
arguments.SetReturn(ic_data);
#endif
}
DEFINE_RUNTIME_ENTRY(UnlinkedCall, 2) {
#if defined(TARGET_ARCH_DBC)
// DBC does not use switchable calls.
UNREACHABLE();
#else
const Instance& receiver = Instance::CheckedHandle(zone, arguments.ArgAt(0));
const UnlinkedCall& unlinked =
UnlinkedCall::CheckedHandle(zone, arguments.ArgAt(1));
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame->IsDartFrame());
const Code& caller_code = Code::Handle(zone, caller_frame->LookupDartCode());
const Function& caller_function =
Function::Handle(zone, caller_frame->LookupDartFunction());
const String& name = String::Handle(zone, unlinked.target_name());
const Array& descriptor = Array::Handle(zone, unlinked.args_descriptor());
const ICData& ic_data =
ICData::Handle(zone, ICData::New(caller_function, name, descriptor,
DeoptId::kNone, 1, /* args_tested */
ICData::kInstance));
Class& cls = Class::Handle(zone, receiver.clazz());
ArgumentsDescriptor args_desc(descriptor);
Function& target_function = Function::Handle(
zone, Resolver::ResolveDynamicForReceiverClass(cls, name, args_desc));
if (target_function.IsNull()) {
target_function = InlineCacheMissHelper(receiver, descriptor, name);
}
if (target_function.IsNull()) {
ASSERT(!FLAG_lazy_dispatchers);
} else {
ic_data.AddReceiverCheck(receiver.GetClassId(), target_function);
}
if (!target_function.IsNull() && !target_function.HasOptionalParameters() &&
!target_function.IsGeneric()) {
// Patch to monomorphic call.
ASSERT(target_function.HasCode());
const Code& target_code = Code::Handle(zone, target_function.CurrentCode());
const Smi& expected_cid =
Smi::Handle(zone, Smi::New(receiver.GetClassId()));
CodePatcher::PatchSwitchableCallAt(caller_frame->pc(), caller_code,
expected_cid, target_code);
// Return the ICData. The miss stub will jump to continue in the IC call
// stub.
arguments.SetReturn(ic_data);
return;
}
// Patch to call through stub.
const Code& stub =
Code::Handle(zone, StubCode::ICCallThroughCode_entry()->code());
ASSERT(!Isolate::Current()->compilation_allowed());
CodePatcher::PatchSwitchableCallAt(caller_frame->pc(), caller_code, ic_data,
stub);
// Return the ICData. The miss stub will jump to continue in the IC lookup
// stub.
arguments.SetReturn(ic_data);
#endif // !DBC
}
// Handle a miss of a megamorphic cache.
// Arg0: Receiver.
// Returns: the ICData used to continue with a polymorphic call.
DEFINE_RUNTIME_ENTRY(MonomorphicMiss, 1) {
#if defined(TARGET_ARCH_DBC)
// DBC does not use switchable calls.
UNREACHABLE();
#else
const Instance& receiver = Instance::CheckedHandle(zone, arguments.ArgAt(0));
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame->IsDartFrame());
const Code& caller_code = Code::Handle(zone, caller_frame->LookupDartCode());
const Function& caller_function =
Function::Handle(zone, caller_frame->LookupDartFunction());
Smi& old_expected_cid = Smi::Handle(zone);
old_expected_cid ^=
CodePatcher::GetSwitchableCallDataAt(caller_frame->pc(), caller_code);
const Code& old_target_code = Code::Handle(
CodePatcher::GetSwitchableCallTargetAt(caller_frame->pc(), caller_code));
Function& old_target = Function::Handle(zone);
old_target ^= old_target_code.owner();
// We lost the original ICData when we patched to the monomorphic case.
const String& name = String::Handle(zone, old_target.name());
ASSERT(!old_target.HasOptionalParameters());
const int kTypeArgsLen = 0;
const Array& descriptor =
Array::Handle(zone, ArgumentsDescriptor::New(
kTypeArgsLen, old_target.num_fixed_parameters()));
const ICData& ic_data =
ICData::Handle(zone, ICData::New(caller_function, name, descriptor,
DeoptId::kNone, 1, /* args_tested */
ICData::kInstance));
// Add the first target.
ic_data.AddReceiverCheck(old_expected_cid.Value(), old_target);
// Maybe add the new target.
Class& cls = Class::Handle(zone, receiver.clazz());
ArgumentsDescriptor args_desc(descriptor);
Function& target_function = Function::Handle(
zone, Resolver::ResolveDynamicForReceiverClass(cls, name, args_desc));
if (target_function.IsNull()) {
target_function = InlineCacheMissHelper(receiver, descriptor, name);
}
if (target_function.IsNull()) {
ASSERT(!FLAG_lazy_dispatchers);
} else {
ic_data.AddReceiverCheck(receiver.GetClassId(), target_function);
}
if (old_target.raw() == target_function.raw()) {
intptr_t lower, upper;
if (old_expected_cid.Value() < receiver.GetClassId()) {
lower = old_expected_cid.Value();
upper = receiver.GetClassId();
} else {
lower = receiver.GetClassId();
upper = old_expected_cid.Value();
}
if (IsSingleTarget(isolate, zone, lower, upper, target_function, name)) {
const SingleTargetCache& cache =
SingleTargetCache::Handle(SingleTargetCache::New());
const Code& code = Code::Handle(target_function.CurrentCode());
cache.set_target(code);
cache.set_entry_point(code.EntryPoint());
cache.set_lower_limit(lower);
cache.set_upper_limit(upper);
const Code& stub =
Code::Handle(zone, StubCode::SingleTargetCall_entry()->code());
CodePatcher::PatchSwitchableCallAt(caller_frame->pc(), caller_code, cache,
stub);
// Return the ICData. The miss stub will jump to continue in the IC call
// stub.
arguments.SetReturn(ic_data);
return;
}
}
// Patch to call through stub.
const Code& stub =
Code::Handle(zone, StubCode::ICCallThroughCode_entry()->code());
ASSERT(!Isolate::Current()->compilation_allowed());
CodePatcher::PatchSwitchableCallAt(caller_frame->pc(), caller_code, ic_data,
stub);
// Return the ICData. The miss stub will jump to continue in the IC lookup
// stub.
arguments.SetReturn(ic_data);
#endif // !defined(TARGET_ARCH_DBC)
}
// Handle a miss of a megamorphic cache.
// Arg0: Receiver.
// Arg1: ICData or MegamorphicCache.
// Arg2: Arguments descriptor array.
// Returns: target function to call.
DEFINE_RUNTIME_ENTRY(MegamorphicCacheMissHandler, 3) {
#if defined(TARGET_ARCH_DBC)
// DBC does not use megamorphic calls right now.
UNREACHABLE();
#else
const Instance& receiver = Instance::CheckedHandle(zone, arguments.ArgAt(0));
const Object& ic_data_or_cache = Object::Handle(zone, arguments.ArgAt(1));
const Array& descriptor = Array::CheckedHandle(zone, arguments.ArgAt(2));
String& name = String::Handle(zone);
if (ic_data_or_cache.IsICData()) {
name = ICData::Cast(ic_data_or_cache).target_name();
} else {
ASSERT(ic_data_or_cache.IsMegamorphicCache());
name = MegamorphicCache::Cast(ic_data_or_cache).target_name();
}
Class& cls = Class::Handle(zone, receiver.clazz());
ASSERT(!cls.IsNull());
ArgumentsDescriptor args_desc(descriptor);
if (FLAG_trace_ic || FLAG_trace_ic_miss_in_optimized) {
OS::PrintErr("Megamorphic IC miss (%s), class=%s, function<%" Pd ">=%s\n",
ic_data_or_cache.IsICData() ? "icdata" : "cache",
cls.ToCString(), args_desc.TypeArgsLen(), name.ToCString());
}
Function& target_function = Function::Handle(
zone, Resolver::ResolveDynamicForReceiverClass(cls, name, args_desc));
if (target_function.IsNull()) {
target_function = InlineCacheMissHelper(receiver, descriptor, name);
if (target_function.IsNull()) {
ASSERT(!FLAG_lazy_dispatchers);
arguments.SetReturn(target_function);
return;
}
}
if (ic_data_or_cache.IsICData()) {
const ICData& ic_data = ICData::Cast(ic_data_or_cache);
const intptr_t number_of_checks = ic_data.NumberOfChecks();
if ((number_of_checks == 0) && !target_function.HasOptionalParameters() &&
!target_function.IsGeneric() &&
!Isolate::Current()->compilation_allowed()) {
// This call site is unlinked: transition to a monomorphic direct call.
// Note we cannot do this if the target has optional parameters because
// the monomorphic direct call does not load the arguments descriptor.
// We cannot do this if we are still in the middle of precompiling because
// the monomorphic case hides a live instance selector from the
// treeshaker.
const Code& target_code =
Code::Handle(zone, target_function.EnsureHasCode());
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* miss_function_frame = iterator.NextFrame();
ASSERT(miss_function_frame->IsDartFrame());
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame->IsDartFrame());
const Code& caller_code =
Code::Handle(zone, caller_frame->LookupDartCode());
const Smi& expected_cid =
Smi::Handle(zone, Smi::New(receiver.GetClassId()));
CodePatcher::PatchSwitchableCallAt(caller_frame->pc(), caller_code,
expected_cid, target_code);
} else {
ic_data.AddReceiverCheck(receiver.GetClassId(), target_function);
if (number_of_checks > FLAG_max_polymorphic_checks) {
// Switch to megamorphic call.
const MegamorphicCache& cache = MegamorphicCache::Handle(
zone, MegamorphicCacheTable::Lookup(isolate, name, descriptor));
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* miss_function_frame = iterator.NextFrame();
ASSERT(miss_function_frame->IsDartFrame());
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame->IsDartFrame());
const Code& caller_code =
Code::Handle(zone, caller_frame->LookupDartCode());
const Code& stub =
Code::Handle(zone, StubCode::MegamorphicCall_entry()->code());
CodePatcher::PatchSwitchableCallAt(caller_frame->pc(), caller_code,
cache, stub);
}
}
} else {
const MegamorphicCache& cache = MegamorphicCache::Cast(ic_data_or_cache);
// Insert function found into cache and return it.
cache.EnsureCapacity();
const Smi& class_id = Smi::Handle(zone, Smi::New(cls.id()));
cache.Insert(class_id, target_function);
}
arguments.SetReturn(target_function);
#endif // !defined(TARGET_ARCH_DBC)
}
// Invoke appropriate noSuchMethod or closure from getter.
// Arg0: receiver
// Arg1: ICData or MegamorphicCache
// Arg2: arguments descriptor array
// Arg3: arguments array
DEFINE_RUNTIME_ENTRY(InvokeNoSuchMethodDispatcher, 4) {
ASSERT(!FLAG_lazy_dispatchers);
const Instance& receiver = Instance::CheckedHandle(zone, arguments.ArgAt(0));
const Object& ic_data_or_cache = Object::Handle(zone, arguments.ArgAt(1));
const Array& orig_arguments_desc =
Array::CheckedHandle(zone, arguments.ArgAt(2));
const Array& orig_arguments = Array::CheckedHandle(zone, arguments.ArgAt(3));
String& target_name = String::Handle(zone);
if (ic_data_or_cache.IsICData()) {
target_name = ICData::Cast(ic_data_or_cache).target_name();
} else {
ASSERT(ic_data_or_cache.IsMegamorphicCache());
target_name = MegamorphicCache::Cast(ic_data_or_cache).target_name();
}
if (Function::IsDynamicInvocationForwaderName(target_name)) {
target_name = Function::DemangleDynamicInvocationForwarderName(target_name);
}
Class& cls = Class::Handle(zone, receiver.clazz());
Function& function = Function::Handle(zone);
// Dart distinguishes getters and regular methods and allows their calls
// to mix with conversions, and its selectors are independent of arity. So do
// a zigzagged lookup to see if this call failed because of an arity mismatch,
// need for conversion, or there really is no such method.
#define NO_SUCH_METHOD() \
const Object& result = Object::Handle( \
zone, DartEntry::InvokeNoSuchMethod( \
receiver, target_name, orig_arguments, orig_arguments_desc)); \
CheckResultError(result); \
arguments.SetReturn(result);
#define CLOSURIZE(some_function) \
const Function& closure_function = \
Function::Handle(zone, some_function.ImplicitClosureFunction()); \
const Object& result = Object::Handle( \
zone, closure_function.ImplicitInstanceClosure(receiver)); \
arguments.SetReturn(result);
const bool is_getter = Field::IsGetterName(target_name);
if (is_getter) {
// o.foo (o.get:foo) failed, closurize o.foo() if it exists.
String& field_name =
String::Handle(zone, Field::NameFromGetter(target_name));
while (!cls.IsNull()) {
function ^= cls.LookupDynamicFunction(field_name);
if (!function.IsNull()) {
CLOSURIZE(function);
return;
}
cls = cls.SuperClass();
}
// Fall through for noSuchMethod
} else {
// o.foo(...) failed, invoke noSuchMethod is foo exists but has the wrong
// number of arguments, or try (o.foo).call(...)
if ((target_name.raw() == Symbols::Call().raw()) && receiver.IsClosure()) {
// Special case: closures are implemented with a call getter instead of a
// call method and with lazy dispatchers the field-invocation-dispatcher
// would perform the closure call.
const Object& result = Object::Handle(
zone, DartEntry::InvokeClosure(orig_arguments, orig_arguments_desc));
CheckResultError(result);
arguments.SetReturn(result);
return;
}
const String& getter_name =
String::Handle(zone, Field::GetterName(target_name));
ArgumentsDescriptor args_desc(orig_arguments_desc);
while (!cls.IsNull()) {
function ^= cls.LookupDynamicFunction(target_name);
if (!function.IsNull()) {
ASSERT(!function.AreValidArguments(args_desc, NULL));
break; // mismatch, invoke noSuchMethod
}
function ^= cls.LookupDynamicFunction(getter_name);
if (!function.IsNull()) {
const Array& getter_arguments = Array::Handle(Array::New(1));
getter_arguments.SetAt(0, receiver);
const Object& getter_result = Object::Handle(
zone, DartEntry::InvokeFunction(function, getter_arguments));
CheckResultError(getter_result);
ASSERT(getter_result.IsNull() || getter_result.IsInstance());
orig_arguments.SetAt(args_desc.FirstArgIndex(), getter_result);
const Object& call_result = Object::Handle(
zone,
DartEntry::InvokeClosure(orig_arguments, orig_arguments_desc));
CheckResultError(call_result);
arguments.SetReturn(call_result);
return;
}
cls = cls.SuperClass();
}
}
NO_SUCH_METHOD();
#undef NO_SUCH_METHOD
#undef CLOSURIZE
}
// Invoke appropriate noSuchMethod function.
// Arg0: receiver (closure object)
// Arg1: arguments descriptor array.
// Arg2: arguments array.
DEFINE_RUNTIME_ENTRY(InvokeClosureNoSuchMethod, 3) {
const Closure& receiver = Closure::CheckedHandle(arguments.ArgAt(0));
const Array& orig_arguments_desc = Array::CheckedHandle(arguments.ArgAt(1));
const Array& orig_arguments = Array::CheckedHandle(arguments.ArgAt(2));
// For closure the function name is always 'call'. Replace it with the
// name of the closurized function so that exception contains more
// relevant information.
const Function& function = Function::Handle(receiver.function());
ASSERT(!function.IsNull());
const String& original_function_name =
String::Handle(function.QualifiedUserVisibleName());
const Object& result = Object::Handle(DartEntry::InvokeNoSuchMethod(
receiver, original_function_name, orig_arguments, orig_arguments_desc));
CheckResultError(result);
arguments.SetReturn(result);
}
#if !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
// The following code is used to stress test
// - deoptimization
// - debugger stack tracing
// - hot reload
static void HandleStackOverflowTestCases(Thread* thread) {
Isolate* isolate = thread->isolate();
bool do_deopt = false;
bool do_stacktrace = false;
bool do_reload = false;
const intptr_t isolate_reload_every =
isolate->reload_every_n_stack_overflow_checks();
if ((FLAG_deoptimize_every > 0) || (FLAG_stacktrace_every > 0) ||
(isolate_reload_every > 0)) {
if (!Isolate::IsVMInternalIsolate(isolate)) {
// TODO(turnidge): To make --deoptimize_every and
// --stacktrace-every faster we could move this increment/test to
// the generated code.
int32_t count = thread->IncrementAndGetStackOverflowCount();
if (FLAG_deoptimize_every > 0 && (count % FLAG_deoptimize_every) == 0) {
do_deopt = true;
}
if (FLAG_stacktrace_every > 0 && (count % FLAG_stacktrace_every) == 0) {
do_stacktrace = true;
}
if ((isolate_reload_every > 0) && (count % isolate_reload_every) == 0) {
do_reload = isolate->CanReload();
}
}
}
if ((FLAG_deoptimize_filter != NULL) || (FLAG_stacktrace_filter != NULL) ||
FLAG_reload_every_optimized) {
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* frame = iterator.NextFrame();
ASSERT(frame != NULL);
const Code& code = Code::Handle(frame->LookupDartCode());
ASSERT(!code.IsNull());
const Function& function = Function::Handle(code.function());
ASSERT(!function.IsNull());
const char* function_name = function.ToFullyQualifiedCString();
ASSERT(function_name != NULL);
if (!code.is_optimized() && FLAG_reload_every_optimized) {
// Don't do the reload if we aren't inside optimized code.
do_reload = false;
}
if (code.is_optimized() && FLAG_deoptimize_filter != NULL &&
strstr(function_name, FLAG_deoptimize_filter) != NULL) {
OS::PrintErr("*** Forcing deoptimization (%s)\n",
function.ToFullyQualifiedCString());
do_deopt = true;
}
if (FLAG_stacktrace_filter != NULL &&
strstr(function_name, FLAG_stacktrace_filter) != NULL) {
OS::PrintErr("*** Computing stacktrace (%s)\n",
function.ToFullyQualifiedCString());
do_stacktrace = true;
}
}
if (do_deopt) {
// TODO(turnidge): Consider using DeoptimizeAt instead.
DeoptimizeFunctionsOnStack();
}
if (do_reload) {
JSONStream js;
// Maybe adjust the rate of future reloads.
isolate->MaybeIncreaseReloadEveryNStackOverflowChecks();
const char* script_uri;
{
NoReloadScope no_reload(isolate, thread);
const Library& lib =
Library::Handle(isolate->object_store()->_internal_library());
const Class& cls = Class::Handle(
lib.LookupClass(String::Handle(String::New("VMLibraryHooks"))));
const Function& func = Function::Handle(cls.LookupFunction(
String::Handle(String::New("get:platformScript"))));
Object& result = Object::Handle(
DartEntry::InvokeFunction(func, Object::empty_array()));
if (result.IsUnwindError()) {
Exceptions::PropagateError(Error::Cast(result));
}
if (!result.IsInstance()) {
FATAL1("Bad script uri hook: %s", result.ToCString());
}
result = DartLibraryCalls::ToString(Instance::Cast(result));
if (result.IsUnwindError()) {
Exceptions::PropagateError(Error::Cast(result));
}
if (!result.IsString()) {
FATAL1("Bad script uri hook: %s", result.ToCString());
}
script_uri = result.ToCString(); // Zone allocated.
}
// Issue a reload.
bool success =
isolate->ReloadSources(&js, true /* force_reload */, script_uri);
if (!success) {
FATAL1("*** Isolate reload failed:\n%s\n", js.ToCString());
}
}
if (do_stacktrace) {
String& var_name = String::Handle();
Instance& var_value = Instance::Handle();
// Collecting the stack trace and accessing local variables
// of frames may trigger parsing of functions to compute
// variable descriptors of functions. Parsing may trigger
// code execution, e.g. to compute compile-time constants. Thus,
// disable FLAG_stacktrace_every during trace collection to prevent
// recursive stack trace collection.
intptr_t saved_stacktrace_every = FLAG_stacktrace_every;
FLAG_stacktrace_every = 0;
DebuggerStackTrace* stack = isolate->debugger()->StackTrace();
intptr_t num_frames = stack->Length();
for (intptr_t i = 0; i < num_frames; i++) {
ActivationFrame* frame = stack->FrameAt(i);
#ifndef DART_PRECOMPILED_RUNTIME
if (!frame->is_interpreted()) {
// Ensure that we have unoptimized code.
frame->function().EnsureHasCompiledUnoptimizedCode();
}
// TODO(regis): Provide var descriptors in kernel bytecode.
const int num_vars =
frame->is_interpreted() ? 0 : frame->NumLocalVariables();
#else
// Variable locations and number are unknown when precompiling.
const int num_vars = 0;
#endif
TokenPosition unused = TokenPosition::kNoSource;
for (intptr_t v = 0; v < num_vars; v++) {
frame->VariableAt(v, &var_name, &unused, &unused, &unused, &var_value);
}
}
if (FLAG_stress_async_stacks) {
Debugger::CollectAwaiterReturnStackTrace();
}
FLAG_stacktrace_every = saved_stacktrace_every;
}
}
#endif // !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
#if !defined(DART_PRECOMPILED_RUNTIME)
static void HandleOSRRequest(Thread* thread) {
Isolate* isolate = thread->isolate();
ASSERT(isolate->use_osr());
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* frame = iterator.NextFrame();
ASSERT(frame != NULL);
const Code& code = Code::ZoneHandle(frame->LookupDartCode());
ASSERT(!code.IsNull());
ASSERT(!code.is_optimized());
const Function& function = Function::Handle(code.function());
ASSERT(!function.IsNull());
// If the code of the frame does not match the function's unoptimized code,
// we bail out since the code was reset by an isolate reload.
if (code.raw() != function.unoptimized_code()) {
return;
}
// Since the code is referenced from the frame and the ZoneHandle,
// it cannot have been removed from the function.
ASSERT(function.HasCode());
// Don't do OSR on intrinsified functions: The intrinsic code expects to be
// called like a regular function and can't be entered via OSR.
if (!Compiler::CanOptimizeFunction(thread, function) ||
function.is_intrinsic()) {
return;
}
// The unoptimized code is on the stack and should never be detached from
// the function at this point.
ASSERT(function.unoptimized_code() != Object::null());
intptr_t osr_id =
Code::Handle(function.unoptimized_code()).GetDeoptIdForOsr(frame->pc());
ASSERT(osr_id != Compiler::kNoOSRDeoptId);
if (FLAG_trace_osr) {
OS::PrintErr("Attempting OSR for %s at id=%" Pd ", count=%" Pd "\n",
function.ToFullyQualifiedCString(), osr_id,
function.usage_counter());
}
// Since the code is referenced from the frame and the ZoneHandle,
// it cannot have been removed from the function.
const Object& result = Object::Handle(
Compiler::CompileOptimizedFunction(thread, function, osr_id));
if (result.IsError()) {
Exceptions::PropagateError(Error::Cast(result));
}
if (!result.IsNull()) {
const Code& code = Code::Cast(result);
uword optimized_entry = Instructions::EntryPoint(code.instructions());
frame->set_pc(optimized_entry);
frame->set_pc_marker(code.raw());
}
}
#endif // !defined(DART_PRECOMPILED_RUNTIME)
DEFINE_RUNTIME_ENTRY(StackOverflow, 0) {
#if defined(USING_SIMULATOR)
uword stack_pos = Simulator::Current()->get_sp();
#else
uword stack_pos = OSThread::GetCurrentStackPointer();
#endif
// Always clear the stack overflow flags. They are meant for this
// particular stack overflow runtime call and are not meant to
// persist.
uword stack_overflow_flags = thread->GetAndClearStackOverflowFlags();
if (FLAG_shared_slow_path_triggers_gc) {
isolate->heap()->CollectAllGarbage();
}
bool interpreter_stack_overflow = false;
#if !defined(DART_PRECOMPILED_RUNTIME)
if (FLAG_enable_interpreter) {
// Do not allocate an interpreter, if none is allocated yet.
Interpreter* interpreter = Isolate::Current()->interpreter();
if (interpreter != NULL) {
interpreter_stack_overflow =
interpreter->get_sp() >= interpreter->stack_limit();
}
}
#endif // !defined(DART_PRECOMPILED_RUNTIME)
// If an interrupt happens at the same time as a stack overflow, we
// process the stack overflow now and leave the interrupt for next
// time.
// TODO(regis): Warning: IsCalleeFrameOf is overridden in stack_frame_dbc.h.
if (interpreter_stack_overflow ||
IsCalleeFrameOf(thread->saved_stack_limit(), stack_pos)) {
// Use the preallocated stack overflow exception to avoid calling
// into dart code.
const Instance& exception =
Instance::Handle(isolate->object_store()->stack_overflow());
Exceptions::Throw(thread, exception);
UNREACHABLE();
}
#if !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
HandleStackOverflowTestCases(thread);
#endif // !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
// Handle interrupts:
// - store buffer overflow
// - OOB message (vm-service or dart:isolate)
const Error& error = Error::Handle(thread->HandleInterrupts());
if (!error.IsNull()) {
Exceptions::PropagateError(error);
UNREACHABLE();
}
#if !defined(DART_PRECOMPILED_RUNTIME)
if ((stack_overflow_flags & Thread::kOsrRequest) != 0) {
HandleOSRRequest(thread);
}
#else
ASSERT((stack_overflow_flags & Thread::kOsrRequest) == 0);
#endif // !defined(DART_PRECOMPILED_RUNTIME)
}
DEFINE_RUNTIME_ENTRY(TraceICCall, 2) {
const ICData& ic_data = ICData::CheckedHandle(arguments.ArgAt(0));
const Function& function = Function::CheckedHandle(arguments.ArgAt(1));
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* frame = iterator.NextFrame();
ASSERT(frame != NULL);
OS::PrintErr("IC call @%#" Px ": ICData: %p cnt:%" Pd " nchecks: %" Pd
" %s\n",
frame->pc(), ic_data.raw(), function.usage_counter(),
ic_data.NumberOfChecks(), function.ToFullyQualifiedCString());
}
// This is called from function that needs to be optimized.
// The requesting function can be already optimized (reoptimization).
// Returns the Code object where to continue execution.
DEFINE_RUNTIME_ENTRY(OptimizeInvokedFunction, 1) {
#if !defined(DART_PRECOMPILED_RUNTIME)
const Function& function = Function::CheckedHandle(zone, arguments.ArgAt(0));
ASSERT(!function.IsNull());
// If running with interpreter, do the unoptimized compilation first.
const bool unoptimized_compilation =
FLAG_enable_interpreter &&
(function.unoptimized_code() == Object::null());
ASSERT(unoptimized_compilation || function.HasCode());
if (unoptimized_compilation ||
Compiler::CanOptimizeFunction(thread, function)) {
if (FLAG_background_compilation) {
Field& field = Field::Handle(zone, isolate->GetDeoptimizingBoxedField());
while (!field.IsNull()) {
if (FLAG_trace_optimization || FLAG_trace_field_guards) {
THR_Print("Lazy disabling unboxing of %s\n", field.ToCString());
}
field.set_is_unboxing_candidate(false);
field.DeoptimizeDependentCode();
// Get next field.
field = isolate->GetDeoptimizingBoxedField();
}
}
// TODO(srdjan): Fix background compilation of regular expressions.
if (FLAG_background_compilation) {
if (FLAG_enable_inlining_annotations) {
FATAL("Cannot enable inlining annotations and background compilation");
}
if (!BackgroundCompiler::IsDisabled(isolate) &&
function.is_background_optimizable()) {
if (FLAG_background_compilation_stop_alot) {
BackgroundCompiler::Stop(isolate);
}
// Reduce the chance of triggering optimization while the function is
// being optimized in the background. INT_MIN should ensure that it
// takes long time to trigger optimization.
// Note that the background compilation queue rejects duplicate entries.
function.SetUsageCounter(INT_MIN);
BackgroundCompiler::Start(isolate);
isolate->background_compiler()->CompileOptimized(function);
// Continue in the same code.
arguments.SetReturn(function);
return;
}
}
// Reset usage counter for reoptimization before calling optimizer to
// prevent recursive triggering of function optimization.
function.SetUsageCounter(0);
if (FLAG_trace_compiler || FLAG_trace_optimizing_compiler) {
if (function.HasOptimizedCode()) {
THR_Print("ReCompiling function: '%s' \n",
function.ToFullyQualifiedCString());
}
}
const Object& result = Object::Handle(
zone, Compiler::CompileOptimizedFunction(thread, function));
if (result.IsError()) {
Exceptions::PropagateError(Error::Cast(result));
}
}
arguments.SetReturn(function);
#else
UNREACHABLE();
#endif // !DART_PRECOMPILED_RUNTIME
}
// The caller must be a static call in a Dart frame, or an entry frame.
// Patch static call to point to valid code's entry point.
DEFINE_RUNTIME_ENTRY(FixCallersTarget, 0) {
#if !defined(DART_PRECOMPILED_RUNTIME)
StackFrameIterator iterator(ValidationPolicy::kDontValidateFrames, thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* frame = iterator.NextFrame();
ASSERT(frame != NULL);
while (frame->IsStubFrame() || frame->IsExitFrame()) {
frame = iterator.NextFrame();
ASSERT(frame != NULL);
}
if (frame->IsEntryFrame()) {
// Since function's current code is always unpatched, the entry frame always
// calls to unpatched code.
UNREACHABLE();
}
ASSERT(frame->IsDartFrame());
const Code& caller_code = Code::Handle(zone, frame->LookupDartCode());
ASSERT(caller_code.is_optimized());
const Function& target_function = Function::Handle(
zone, caller_code.GetStaticCallTargetFunctionAt(frame->pc()));
const Code& current_target_code =
Code::Handle(zone, target_function.EnsureHasCode());
CodePatcher::PatchStaticCallAt(frame->pc(), caller_code, current_target_code);
caller_code.SetStaticCallTargetCodeAt(frame->pc(), current_target_code);
if (FLAG_trace_patching) {
OS::PrintErr("FixCallersTarget: caller %#" Px
" "
"target '%s' -> %#" Px "\n",
frame->pc(), target_function.ToFullyQualifiedCString(),
current_target_code.EntryPoint());
}
ASSERT(!current_target_code.IsDisabled());
arguments.SetReturn(current_target_code);
#else
UNREACHABLE();
#endif
}
// The caller tried to allocate an instance via an invalidated allocation
// stub.
DEFINE_RUNTIME_ENTRY(FixAllocationStubTarget, 0) {
#if !defined(DART_PRECOMPILED_RUNTIME)
StackFrameIterator iterator(ValidationPolicy::kDontValidateFrames, thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* frame = iterator.NextFrame();
ASSERT(frame != NULL);
while (frame->IsStubFrame() || frame->IsExitFrame()) {
frame = iterator.NextFrame();
ASSERT(frame != NULL);
}
if (frame->IsEntryFrame()) {
// There must be a valid Dart frame.
UNREACHABLE();
}
ASSERT(frame->IsDartFrame());
const Code& caller_code = Code::Handle(zone, frame->LookupDartCode());
ASSERT(!caller_code.IsNull());
const Code& stub = Code::Handle(
CodePatcher::GetStaticCallTargetAt(frame->pc(), caller_code));
Class& alloc_class = Class::ZoneHandle(zone);
alloc_class ^= stub.owner();
Code& alloc_stub = Code::Handle(zone, alloc_class.allocation_stub());
if (alloc_stub.IsNull()) {
alloc_stub = StubCode::GetAllocationStubForClass(alloc_class);
ASSERT(!alloc_stub.IsDisabled());
}
CodePatcher::PatchStaticCallAt(frame->pc(), caller_code, alloc_stub);
caller_code.SetStubCallTargetCodeAt(frame->pc(), alloc_stub);
if (FLAG_trace_patching) {
OS::PrintErr("FixAllocationStubTarget: caller %#" Px
" alloc-class %s "
" -> %#" Px "\n",
frame->pc(), alloc_class.ToCString(), alloc_stub.EntryPoint());
}
arguments.SetReturn(alloc_stub);
#else
UNREACHABLE();
#endif
}
const char* DeoptReasonToCString(ICData::DeoptReasonId deopt_reason) {
switch (deopt_reason) {
#define DEOPT_REASON_TO_TEXT(name) \
case ICData::kDeopt##name: \
return #name;
DEOPT_REASONS(DEOPT_REASON_TO_TEXT)
#undef DEOPT_REASON_TO_TEXT
default:
UNREACHABLE();
return "";
}
}
void DeoptimizeAt(const Code& optimized_code, StackFrame* frame) {
ASSERT(optimized_code.is_optimized());
Thread* thread = Thread::Current();
Zone* zone = thread->zone();
const Function& function = Function::Handle(zone, optimized_code.function());
const Error& error =
Error::Handle(zone, Compiler::EnsureUnoptimizedCode(thread, function));
if (!error.IsNull()) {
Exceptions::PropagateError(error);
}
const Code& unoptimized_code =
Code::Handle(zone, function.unoptimized_code());
ASSERT(!unoptimized_code.IsNull());
// The switch to unoptimized code may have already occurred.
if (function.HasOptimizedCode()) {
function.SwitchToUnoptimizedCode();
}
#if defined(TARGET_ARCH_DBC)
const Instructions& instrs =
Instructions::Handle(zone, optimized_code.instructions());
{
WritableInstructionsScope writable(instrs.PayloadStart(), instrs.Size());
CodePatcher::InsertDeoptimizationCallAt(frame->pc());
if (FLAG_trace_patching) {
const String& name = String::Handle(function.name());
OS::PrintErr("InsertDeoptimizationCallAt: 0x%" Px " for %s\n",
frame->pc(), name.ToCString());
}
const ExceptionHandlers& handlers =
ExceptionHandlers::Handle(zone, optimized_code.exception_handlers());
ExceptionHandlerInfo info;
for (intptr_t i = 0; i < handlers.num_entries(); ++i) {
handlers.GetHandlerInfo(i, &info);
const uword patch_pc = instrs.PayloadStart() + info.handler_pc_offset;
CodePatcher::InsertDeoptimizationCallAt(patch_pc);
if (FLAG_trace_patching) {
OS::PrintErr(" at handler 0x%" Px "\n", patch_pc);
}
}
}
#else // !DBC
if (frame->IsMarkedForLazyDeopt()) {
// Deopt already scheduled.
if (FLAG_trace_deoptimization) {
THR_Print("Lazy deopt already scheduled for fp=%" Pp "\n", frame->fp());
}
} else {
uword deopt_pc = frame->pc();
ASSERT(optimized_code.ContainsInstructionAt(deopt_pc));
#if defined(DEBUG)
ValidateFrames();
#endif
// N.B.: Update the pending deopt table before updating the frame. The
// profiler may attempt a stack walk in between.
thread->isolate()->AddPendingDeopt(frame->fp(), deopt_pc);
frame->MarkForLazyDeopt();
if (FLAG_trace_deoptimization) {
THR_Print("Lazy deopt scheduled for fp=%" Pp ", pc=%" Pp "\n",
frame->fp(), deopt_pc);
}
}
#endif // !DBC
// Mark code as dead (do not GC its embedded objects).
optimized_code.set_is_alive(false);
}
// Currently checks only that all optimized frames have kDeoptIndex
// and unoptimized code has the kDeoptAfter.
void DeoptimizeFunctionsOnStack() {
DartFrameIterator iterator(Thread::Current(),
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* frame = iterator.NextFrame();
Code& optimized_code = Code::Handle();
while (frame != NULL) {
optimized_code = frame->LookupDartCode();
if (optimized_code.is_optimized()) {
DeoptimizeAt(optimized_code, frame);
}
frame = iterator.NextFrame();
}
}
#if !defined(DART_PRECOMPILED_RUNTIME)
#if !defined(TARGET_ARCH_DBC)
static const intptr_t kNumberOfSavedCpuRegisters = kNumberOfCpuRegisters;
static const intptr_t kNumberOfSavedFpuRegisters = kNumberOfFpuRegisters;
#else
static const intptr_t kNumberOfSavedCpuRegisters = 0;
static const intptr_t kNumberOfSavedFpuRegisters = 0;
#endif
static void CopySavedRegisters(uword saved_registers_address,
fpu_register_t** fpu_registers,
intptr_t** cpu_registers) {
ASSERT(sizeof(fpu_register_t) == kFpuRegisterSize);
fpu_register_t* fpu_registers_copy =
new fpu_register_t[kNumberOfSavedFpuRegisters];
ASSERT(fpu_registers_copy != NULL);
for (intptr_t i = 0; i < kNumberOfSavedFpuRegisters; i++)