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dart / sdk.git / dc51871eef78a20c87a7224b10c41f40b095f700 / . / runtime / vm / runtime_entry.cc
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// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "vm/runtime_entry.h"
#include "platform/thread_sanitizer.h"
#include "vm/code_descriptors.h"
#include "vm/code_patcher.h"
#include "vm/compiler/api/deopt_id.h"
#include "vm/compiler/api/type_check_mode.h"
#include "vm/compiler/jit/compiler.h"
#include "vm/dart_api_impl.h"
#include "vm/dart_api_state.h"
#include "vm/dart_entry.h"
#include "vm/debugger.h"
#include "vm/double_conversion.h"
#include "vm/exceptions.h"
#include "vm/flags.h"
#include "vm/heap/verifier.h"
#include "vm/instructions.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.h"
#include "vm/thread_registry.h"
#include "vm/type_testing_stubs.h"
#if !defined(DART_PRECOMPILED_RUNTIME)
#include "vm/deopt_instructions.h"
#endif // !defined(DART_PRECOMPILED_RUNTIME)
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,
stress_write_barrier_elimination,
false,
"Stress test write barrier elimination.");
DEFINE_FLAG(bool, trace_deoptimization, false, "Trace deoptimization");
DEFINE_FLAG(bool,
trace_deoptimization_verbose,
false,
"Trace deoptimization verbose");
DECLARE_FLAG(int, max_deoptimization_counter_threshold);
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, gc_every, 0, "Run major GC on every N stack overflow checks");
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");
DEFINE_FLAG(charp,
deoptimize_on_runtime_call_name_filter,
NULL,
"Runtime call name filter for --deoptimize-on-runtime-call-every.");
DEFINE_FLAG(bool,
unopt_monomorphic_calls,
true,
"Enable specializing monomorphic calls from unoptimized code.");
DEFINE_FLAG(bool,
unopt_megamorphic_calls,
true,
"Enable specializing megamorphic calls from unoptimized code.");
DEFINE_FLAG(bool,
verbose_stack_overflow,
false,
"Print additional details about stack overflow.");
DECLARE_FLAG(int, reload_every);
DECLARE_FLAG(bool, reload_every_optimized);
DECLARE_FLAG(bool, reload_every_back_off);
#if defined(TESTING) || defined(DEBUG)
void VerifyOnTransition() {
Thread* thread = Thread::Current();
TransitionGeneratedToVM transition(thread);
VerifyPointersVisitor::VerifyPointers();
thread->isolate_group()->heap()->Verify();
}
#endif
DEFINE_RUNTIME_ENTRY(RangeError, 2) {
const Instance& length = Instance::CheckedHandle(zone, arguments.ArgAt(0));
const Instance& index = Instance::CheckedHandle(zone, arguments.ArgAt(1));
if (!length.IsInteger()) {
// Throw: new ArgumentError.value(length, "length", "is not an integer");
const Array& args = Array::Handle(zone, Array::New(3));
args.SetAt(0, length);
args.SetAt(1, Symbols::Length());
args.SetAt(2, String::Handle(zone, 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(zone, Array::New(3));
args.SetAt(0, index);
args.SetAt(1, Symbols::Index());
args.SetAt(2, String::Handle(zone, 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(zone, Array::New(4));
args.SetAt(0, index);
args.SetAt(1, Integer::Handle(zone, Integer::New(0)));
args.SetAt(
2, Integer::Handle(
zone, Integer::Cast(length).ArithmeticOp(
Token::kSUB, Integer::Handle(zone, Integer::New(1)))));
args.SetAt(3, Symbols::Length());
Exceptions::ThrowByType(Exceptions::kRange, args);
}
static void NullErrorHelper(Zone* zone,
const String& selector,
bool is_param_name = false) {
if (is_param_name) {
const String& error = String::Handle(
selector.IsNull()
? String::New("argument value is null")
: String::NewFormatted("argument value for '%s' is null",
selector.ToCString()));
Exceptions::ThrowArgumentError(error);
return;
}
// If the selector is null, this must be a null check that wasn't due to a
// method invocation, so was due to the null check operator.
if (selector.IsNull()) {
const Array& args = Array::Handle(zone, Array::New(4));
args.SetAt(
3, String::Handle(
zone, String::New("Null check operator used on a null value")));
Exceptions::ThrowByType(Exceptions::kCast, args);
return;
}
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(7));
args.SetAt(0, /* instance */ Object::null_object());
args.SetAt(1, selector);
args.SetAt(2, invocation_type);
args.SetAt(3, /* func_type_args_length */ Object::smi_zero());
args.SetAt(4, /* func_type_args */ Object::null_object());
args.SetAt(5, /* func_args */ Object::null_object());
args.SetAt(6, /* func_arg_names */ Object::null_object());
Exceptions::ThrowByType(Exceptions::kNoSuchMethod, args);
}
static void DoThrowNullError(Isolate* isolate,
Thread* thread,
Zone* zone,
bool is_param) {
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->group()->heap()->CollectAllGarbage();
}
const CodeSourceMap& map =
CodeSourceMap::Handle(zone, code.code_source_map());
String& member_name = String::Handle(zone);
if (!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.GetObjectPool());
member_name ^= pool.ObjectAt(name_index);
} else {
member_name = Symbols::OptimizedOut().ptr();
}
NullErrorHelper(zone, member_name, is_param);
}
DEFINE_RUNTIME_ENTRY(NullError, 0) {
DoThrowNullError(isolate, thread, zone, /*is_param=*/false);
}
// Collects information about pointers within the top |kMaxSlotsCollected|
// slots on the stack.
// TODO(b/179632636) This code is added in attempt to better understand
// b/179632636 and should be removed in the future.
void ReportImpossibleNullError(intptr_t cid,
StackFrame* caller_frame,
Thread* thread) {
TextBuffer buffer(512);
buffer.Printf("hit null error with cid %" Pd ", caller context: ", cid);
const intptr_t kMaxSlotsCollected = 5;
const auto slots = reinterpret_cast<ObjectPtr*>(caller_frame->sp());
const intptr_t num_slots_in_frame =
reinterpret_cast<ObjectPtr*>(caller_frame->fp()) - slots;
const auto num_slots_to_collect =
Utils::Maximum(kMaxSlotsCollected, num_slots_in_frame);
bool comma = false;
for (intptr_t i = 0; i < num_slots_to_collect; i++) {
const ObjectPtr ptr = slots[i];
buffer.Printf("%s[sp+%" Pd "] %" Pp "", comma ? ", " : "", i,
static_cast<uword>(ptr));
if (ptr->IsHeapObject() &&
(Dart::vm_isolate_group()->heap()->Contains(
UntaggedObject::ToAddr(ptr)) ||
thread->heap()->Contains(UntaggedObject::ToAddr(ptr)))) {
buffer.Printf("(%" Pp ")", static_cast<uword>(ptr->untag()->tags_));
}
comma = true;
}
const char* message = buffer.buffer();
FATAL("%s", message);
}
DEFINE_RUNTIME_ENTRY(DispatchTableNullError, 1) {
const Smi& cid = Smi::CheckedHandle(zone, arguments.ArgAt(0));
if (cid.Value() != kNullCid) {
// We hit null error, but receiver is not null itself. This most likely
// is a memory corruption. Crash the VM but provide some additonal
// information about the arguments on the stack.
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
RELEASE_ASSERT(caller_frame->IsDartFrame());
ReportImpossibleNullError(cid.Value(), caller_frame, thread);
}
DoThrowNullError(isolate, thread, zone, /*is_param=*/false);
}
DEFINE_RUNTIME_ENTRY(NullErrorWithSelector, 1) {
const String& selector = String::CheckedHandle(zone, arguments.ArgAt(0));
NullErrorHelper(zone, selector);
}
DEFINE_RUNTIME_ENTRY(NullCastError, 0) {
NullErrorHelper(zone, String::null_string());
}
DEFINE_RUNTIME_ENTRY(ArgumentNullError, 0) {
DoThrowNullError(isolate, thread, zone, /*is_param=*/true);
}
DEFINE_RUNTIME_ENTRY(ArgumentError, 1) {
const Instance& value = Instance::CheckedHandle(zone, 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(DoubleToInteger, 1) {
// Unboxed value is passed through a dedicated slot in Thread.
double val = arguments.thread()->unboxed_double_runtime_arg();
const Smi& recognized_kind = Smi::CheckedHandle(zone, arguments.ArgAt(0));
switch (recognized_kind.Value()) {
case MethodRecognizer::kDoubleToInteger:
break;
case MethodRecognizer::kDoubleFloorToInt:
val = floor(val);
break;
case MethodRecognizer::kDoubleCeilToInt:
val = ceil(val);
break;
default:
UNREACHABLE();
}
arguments.SetReturn(Integer::Handle(zone, DoubleToInteger(zone, val)));
}
DEFINE_RUNTIME_ENTRY(IntegerDivisionByZeroException, 0) {
const Array& args = Array::Handle(zone, Array::New(0));
Exceptions::ThrowByType(Exceptions::kIntegerDivisionByZeroException, args);
}
static Heap::Space SpaceForRuntimeAllocation() {
return FLAG_stress_write_barrier_elimination ? Heap::kOld : Heap::kNew;
}
// 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(zone, arguments.ArgAt(0));
if (!length.IsInteger()) {
// Throw: new ArgumentError.value(length, "length", "is not an integer");
const Array& args = Array::Handle(zone, Array::New(3));
args.SetAt(0, length);
args.SetAt(1, Symbols::Length());
args.SetAt(2, String::Handle(zone, String::New("is not an integer")));
Exceptions::ThrowByType(Exceptions::kArgumentValue, args);
}
const int64_t len = Integer::Cast(length).AsInt64Value();
if (len < 0) {
// Throw: new RangeError.range(length, 0, Array::kMaxElements, "length");
Exceptions::ThrowRangeError("length", Integer::Cast(length), 0,
Array::kMaxElements);
}
if (len > Array::kMaxElements) {
const Instance& exception = Instance::Handle(
zone, thread->isolate_group()->object_store()->out_of_memory());
Exceptions::Throw(thread, exception);
}
const Array& array = Array::Handle(
zone,
Array::New(static_cast<intptr_t>(len), SpaceForRuntimeAllocation()));
arguments.SetReturn(array);
TypeArguments& element_type =
TypeArguments::CheckedHandle(zone, 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.
}
DEFINE_RUNTIME_ENTRY_NO_LAZY_DEOPT(AllocateDouble, 0) {
if (FLAG_shared_slow_path_triggers_gc) {
isolate->group()->heap()->CollectAllGarbage();
}
arguments.SetReturn(Object::Handle(zone, Double::New(0.0)));
}
DEFINE_RUNTIME_ENTRY_NO_LAZY_DEOPT(BoxDouble, 0) {
const double val = thread->unboxed_double_runtime_arg();
arguments.SetReturn(Object::Handle(zone, Double::New(val)));
}
DEFINE_RUNTIME_ENTRY_NO_LAZY_DEOPT(AllocateMint, 0) {
if (FLAG_shared_slow_path_triggers_gc) {
isolate->group()->heap()->CollectAllGarbage();
}
arguments.SetReturn(Object::Handle(zone, Integer::New(kMaxInt64)));
}
DEFINE_RUNTIME_ENTRY_NO_LAZY_DEOPT(AllocateFloat32x4, 0) {
if (FLAG_shared_slow_path_triggers_gc) {
isolate->group()->heap()->CollectAllGarbage();
}
arguments.SetReturn(Object::Handle(zone, Float32x4::New(0.0, 0.0, 0.0, 0.0)));
}
DEFINE_RUNTIME_ENTRY_NO_LAZY_DEOPT(AllocateFloat64x2, 0) {
if (FLAG_shared_slow_path_triggers_gc) {
isolate->group()->heap()->CollectAllGarbage();
}
arguments.SetReturn(Object::Handle(zone, Float64x2::New(0.0, 0.0)));
}
DEFINE_RUNTIME_ENTRY_NO_LAZY_DEOPT(AllocateInt32x4, 0) {
if (FLAG_shared_slow_path_triggers_gc) {
isolate->group()->heap()->CollectAllGarbage();
}
arguments.SetReturn(Object::Handle(zone, Int32x4::New(0, 0, 0, 0)));
}
// Allocate typed data array of given class id and length.
// Arg0: class id.
// Arg1: number of elements.
// Return value: newly allocated typed data array.
DEFINE_RUNTIME_ENTRY(AllocateTypedData, 2) {
const intptr_t cid = Smi::CheckedHandle(zone, arguments.ArgAt(0)).Value();
const auto& length = Instance::CheckedHandle(zone, arguments.ArgAt(1));
if (!length.IsInteger()) {
const Array& args = Array::Handle(zone, Array::New(1));
args.SetAt(0, length);
Exceptions::ThrowByType(Exceptions::kArgument, args);
}
const int64_t len = Integer::Cast(length).AsInt64Value();
const intptr_t max = TypedData::MaxElements(cid);
if (len < 0) {
Exceptions::ThrowRangeError("length", Integer::Cast(length), 0, max);
} else if (len > max) {
const Instance& exception = Instance::Handle(
zone, thread->isolate_group()->object_store()->out_of_memory());
Exceptions::Throw(thread, exception);
}
const auto& typed_data =
TypedData::Handle(zone, TypedData::New(cid, static_cast<intptr_t>(len)));
arguments.SetReturn(typed_data);
}
// 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();
}
// Result of an invoke may be an unhandled exception, in which case we
// rethrow it.
static void ThrowIfError(const Object& result) {
if (!result.IsNull() && result.IsError()) {
Exceptions::PropagateError(Error::Cast(result));
}
}
// 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(zone, arguments.ArgAt(0));
const Error& error =
Error::Handle(zone, cls.EnsureIsAllocateFinalized(thread));
ThrowIfError(error);
const Instance& instance =
Instance::Handle(zone, Instance::New(cls, SpaceForRuntimeAllocation()));
arguments.SetReturn(instance);
if (cls.NumTypeArguments() == 0) {
// No type arguments required for a non-parameterized type.
ASSERT(Instance::CheckedHandle(zone, arguments.ArgAt(1)).IsNull());
} else {
const auto& type_arguments =
TypeArguments::CheckedHandle(zone, 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);
}
}
DEFINE_LEAF_RUNTIME_ENTRY(uword /*ObjectPtr*/,
EnsureRememberedAndMarkingDeferred,
2,
uword /*ObjectPtr*/ object_in,
Thread* thread) {
ObjectPtr object = static_cast<ObjectPtr>(object_in);
// The allocation stubs will call this leaf method for newly allocated
// old space objects.
RELEASE_ASSERT(object->IsOldObject());
// If we eliminate a generational write barriers on allocations of an object
// we need to ensure it's either a new-space object or it has been added to
// the remebered set.
//
// NOTE: We use reinterpret_cast<>() instead of ::RawCast() to avoid handle
// allocations in debug mode. Handle allocations in leaf runtimes can cause
// memory leaks because they will allocate into a handle scope from the next
// outermost runtime code (to which the genenerated Dart code might not return
// in a long time).
bool add_to_remembered_set = true;
if (object->untag()->IsRemembered()) {
// Objects must not be added to the remembered set twice because the
// scavenger's visitor is not idempotent.
// Might already be remembered because of type argument store in
// AllocateArray or any field in CloneContext.
add_to_remembered_set = false;
} else if (object->IsArray()) {
const intptr_t length = Array::LengthOf(static_cast<ArrayPtr>(object));
add_to_remembered_set =
compiler::target::WillAllocateNewOrRememberedArray(length);
} else if (object->IsContext()) {
const intptr_t num_context_variables =
Context::NumVariables(static_cast<ContextPtr>(object));
add_to_remembered_set =
compiler::target::WillAllocateNewOrRememberedContext(
num_context_variables);
}
if (add_to_remembered_set) {
object->untag()->EnsureInRememberedSet(thread);
}
// For incremental write barrier elimination, we need to ensure that the
// allocation ends up in the new space or else the object needs to added
// to deferred marking stack so it will be [re]scanned.
if (thread->is_marking()) {
thread->DeferredMarkingStackAddObject(object);
}
return static_cast<uword>(object);
}
END_LEAF_RUNTIME_ENTRY
// 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());
ASSERT(instantiator_type_arguments.IsNull() ||
instantiator_type_arguments.IsInstantiated());
ASSERT(function_type_arguments.IsNull() ||
function_type_arguments.IsInstantiated());
type = type.InstantiateFrom(instantiator_type_arguments,
function_type_arguments, kAllFree, Heap::kOld);
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());
type_arguments = type_arguments.InstantiateAndCanonicalizeFrom(
instantiator_type_arguments, function_type_arguments);
ASSERT(type_arguments.IsNull() || type_arguments.IsInstantiated());
arguments.SetReturn(type_arguments);
}
// Helper routine for tracing a subtype check.
static void PrintSubtypeCheck(const AbstractType& subtype,
const AbstractType& supertype,
const bool result) {
DartFrameIterator iterator(Thread::Current(),
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame != NULL);
LogBlock lb;
THR_Print("SubtypeCheck: '%s' %d %s '%s' %d (pc: %#" Px ").\n",
String::Handle(subtype.Name()).ToCString(), subtype.type_class_id(),
result ? "is" : "is !",
String::Handle(supertype.Name()).ToCString(),
supertype.type_class_id(), caller_frame->pc());
const Function& function =
Function::Handle(caller_frame->LookupDartFunction());
if (function.HasSavedArgumentsDescriptor()) {
const auto& args_desc_array = Array::Handle(function.saved_args_desc());
const ArgumentsDescriptor args_desc(args_desc_array);
THR_Print(" -> Function %s [%s]\n", function.ToFullyQualifiedCString(),
args_desc.ToCString());
} else {
THR_Print(" -> Function %s\n", function.ToFullyQualifiedCString());
}
}
// 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));
if (supertype.IsTypeRef()) {
supertype = TypeRef::Cast(supertype).type();
}
ASSERT(!supertype.IsNull() && !supertype.IsTypeRef());
// Now that AssertSubtype may be checking types only available at runtime,
// we can't guarantee the supertype isn't the top type.
if (supertype.IsTopTypeForSubtyping()) return;
if (subtype.IsTypeRef()) {
subtype = TypeRef::Cast(subtype).type();
}
ASSERT(!subtype.IsNull() && !subtype.IsTypeRef());
// The supertype or subtype may not be instantiated.
if (AbstractType::InstantiateAndTestSubtype(
&subtype, &supertype, instantiator_type_args, function_type_args)) {
if (FLAG_trace_type_checks) {
// The supertype and subtype are now instantiated. Subtype check passed.
PrintSubtypeCheck(subtype, supertype, true);
}
return;
}
if (FLAG_trace_type_checks) {
// The supertype and subtype are now instantiated. Subtype check failed.
PrintSubtypeCheck(subtype, supertype, false);
}
// Throw a dynamic type error.
const TokenPosition location = GetCallerLocation();
Exceptions::CreateAndThrowTypeError(location, subtype, supertype, dst_name);
UNREACHABLE();
}
// Allocate a new closure and initializes its function and context fields with
// the arguments and all other fields to null.
// Arg0: function.
// Arg1: context.
// Return value: newly allocated closure.
DEFINE_RUNTIME_ENTRY(AllocateClosure, 2) {
const auto& function = Function::CheckedHandle(zone, arguments.ArgAt(0));
const auto& context = Context::CheckedHandle(zone, arguments.ArgAt(1));
const Closure& closure = Closure::Handle(
zone,
Closure::New(Object::null_type_arguments(), Object::null_type_arguments(),
Object::null_type_arguments(), function, context,
SpaceForRuntimeAllocation()));
arguments.SetReturn(closure);
}
// 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(
zone, Context::New(num_variables.Value(), SpaceForRuntimeAllocation()));
arguments.SetReturn(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(), SpaceForRuntimeAllocation()));
cloned_ctx.set_parent(Context::Handle(zone, 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);
}
// 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)));
LogBlock lb;
if (type.IsInstantiated()) {
THR_Print("%s: '%s' %d %s '%s' %d (pc: %#" Px ").\n", message,
String::Handle(instance_type.Name()).ToCString(),
instance_type.type_class_id(),
(result.ptr() == Bool::True().ptr()) ? "is" : "is !",
String::Handle(type.Name()).ToCString(), type.type_class_id(),
caller_frame->pc());
} else {
// Instantiate type before printing.
const AbstractType& instantiated_type = AbstractType::Handle(
type.InstantiateFrom(instantiator_type_arguments,
function_type_arguments, kAllFree, Heap::kOld));
THR_Print("%s: '%s' %s '%s' instantiated from '%s' (pc: %#" Px ").\n",
message, String::Handle(instance_type.Name()).ToCString(),
(result.ptr() == Bool::True().ptr()) ? "is" : "is !",
String::Handle(instantiated_type.Name()).ToCString(),
String::Handle(type.Name()).ToCString(), caller_frame->pc());
}
const Function& function =
Function::Handle(caller_frame->LookupDartFunction());
if (function.HasSavedArgumentsDescriptor()) {
const auto& args_desc_array = Array::Handle(function.saved_args_desc());
const ArgumentsDescriptor args_desc(args_desc_array);
THR_Print(" -> Function %s [%s]\n", function.ToFullyQualifiedCString(),
args_desc.ToCString());
} else {
THR_Print(" -> Function %s\n", function.ToFullyQualifiedCString());
}
}
// This updates the type test cache, an array containing 8 elements:
// - instance class (or function if the instance is a closure)
// - instance type arguments (null if the instance class is not generic)
// - instantiator type arguments (null if the type is instantiated)
// - function type arguments (null if the type is instantiated)
// - instance parent function type arguments (null if instance is not a closure)
// - instance delayed type arguments (null if instance is not a closure)
// - destination type (null if the type was known at compile time)
// - 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,
Thread* thread,
const Instance& instance,
const AbstractType& destination_type,
const TypeArguments& instantiator_type_arguments,
const TypeArguments& function_type_arguments,
const Bool& result,
const SubtypeTestCache& new_cache) {
ASSERT(!new_cache.IsNull());
ASSERT(destination_type.IsCanonical());
ASSERT(instantiator_type_arguments.IsCanonical());
ASSERT(function_type_arguments.IsCanonical());
Class& instance_class = Class::Handle(zone);
if (instance.IsSmi()) {
instance_class = Smi::Class();
} else {
instance_class = instance.clazz();
}
// If the type is uninstantiated and refers to parent function type
// parameters, the function_type_arguments have been canonicalized
// when concatenated.
auto& instance_class_id_or_signature = 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& function = Function::Handle(zone, closure.function());
instance_class_id_or_signature = function.signature();
ASSERT(instance_class_id_or_signature.IsFunctionType());
instance_type_arguments = closure.instantiator_type_arguments();
instance_parent_function_type_arguments = closure.function_type_arguments();
instance_delayed_type_arguments = closure.delayed_type_arguments();
ASSERT(instance_class_id_or_signature.IsCanonical());
ASSERT(instance_type_arguments.IsCanonical());
ASSERT(instance_parent_function_type_arguments.IsCanonical());
ASSERT(instance_delayed_type_arguments.IsCanonical());
} else {
instance_class_id_or_signature = Smi::New(instance_class.id());
if (instance_class.NumTypeArguments() > 0) {
instance_type_arguments = instance.GetTypeArguments();
ASSERT(instance_type_arguments.IsCanonical());
}
}
if (FLAG_trace_type_checks) {
const auto& instance_class_name =
String::Handle(zone, instance_class.Name());
TextBuffer buffer(256);
buffer.Printf(" Updating test cache %#" Px " with result %s for:\n",
static_cast<uword>(new_cache.ptr()), result.ToCString());
if (instance.IsString()) {
buffer.Printf(" instance: '%s'\n", instance.ToCString());
} else {
buffer.Printf(" instance: %s\n", instance.ToCString());
}
buffer.Printf(" class: %s (%" Pd ")\n", instance_class_name.ToCString(),
instance_class.id());
buffer.Printf(
" raw entry: [ %#" Px ", %#" Px ", %#" Px ", %#" Px ", %#" Px
", %#" Px ", %#" Px ", %#" Px " ]\n",
static_cast<uword>(instance_class_id_or_signature.ptr()),
static_cast<uword>(destination_type.ptr()),
static_cast<uword>(instance_type_arguments.ptr()),
static_cast<uword>(instantiator_type_arguments.ptr()),
static_cast<uword>(function_type_arguments.ptr()),
static_cast<uword>(instance_parent_function_type_arguments.ptr()),
static_cast<uword>(instance_delayed_type_arguments.ptr()),
static_cast<uword>(result.ptr()));
THR_Print("%s", buffer.buffer());
}
{
SafepointMutexLocker ml(
thread->isolate_group()->subtype_test_cache_mutex());
const intptr_t len = new_cache.NumberOfChecks();
if (len >= FLAG_max_subtype_cache_entries) {
if (FLAG_trace_type_checks) {
THR_Print("Not updating subtype test cache as its length reached %d\n",
FLAG_max_subtype_cache_entries);
}
return;
}
intptr_t colliding_index = -1;
auto& old_result = Bool::Handle(zone);
if (new_cache.HasCheck(
instance_class_id_or_signature, destination_type,
instance_type_arguments, instantiator_type_arguments,
function_type_arguments, instance_parent_function_type_arguments,
instance_delayed_type_arguments, &colliding_index, &old_result)) {
if (FLAG_trace_type_checks) {
TextBuffer buffer(256);
buffer.Printf(" Collision for test cache %#" Px " at index %" Pd ":\n",
static_cast<uword>(new_cache.ptr()), colliding_index);
buffer.Printf(" entry: ");
new_cache.WriteEntryToBuffer(zone, &buffer, colliding_index, " ");
THR_Print("%s\n", buffer.buffer());
}
if (old_result.ptr() != result.ptr()) {
FATAL("Existing subtype test cache entry has result %s, not %s",
old_result.ToCString(), result.ToCString());
}
// Some other isolate might have updated the cache between entry was
// found missing and now.
return;
}
new_cache.AddCheck(instance_class_id_or_signature, destination_type,
instance_type_arguments, instantiator_type_arguments,
function_type_arguments,
instance_parent_function_type_arguments,
instance_delayed_type_arguments, result);
if (FLAG_trace_type_checks) {
TextBuffer buffer(256);
buffer.Printf(" Added new entry to test cache %#" Px " at index %" Pd
":\n",
static_cast<uword>(new_cache.ptr()), len);
buffer.Printf(" new entry: ");
new_cache.WriteEntryToBuffer(zone, &buffer, len, " ");
THR_Print("%s\n", buffer.buffer());
}
}
}
// Check that the given instance is an instance of the given type.
// Tested instance may be null, because a null test cannot always be inlined,
// e.g 'null is T' yields true if T = Null, but false if T = bool.
// 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.
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.IsDynamicType()); // No need to check assignment.
ASSERT(!cache.IsNull());
const Bool& result = Bool::Get(instance.IsInstanceOf(
type, instantiator_type_arguments, function_type_arguments));
if (FLAG_trace_type_checks) {
PrintTypeCheck("InstanceOf", instance, type, instantiator_type_arguments,
function_type_arguments, result);
}
UpdateTypeTestCache(zone, thread, 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.
// Tested instance may not be null, because a null test is always inlined.
// 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));
const 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)
ASSERT(mode == kTypeCheckFromInline);
#endif
// These are guaranteed on the calling side.
ASSERT(!dst_type.IsDynamicType());
ASSERT(!src_instance.IsNull() ||
isolate->group()->use_strict_null_safety_checks());
const bool is_instance_of = src_instance.IsAssignableTo(
dst_type, instantiator_type_arguments, function_type_arguments);
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) {
if (dst_name.IsNull()) {
#if !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.GetObjectPool());
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
}
if (dst_name.ptr() ==
Symbols::dynamic_assert_assignable_stc_check().ptr()) {
#if !defined(TARGET_ARCH_IA32)
// Can only come here from type testing stub via dynamic AssertAssignable.
ASSERT(mode != kTypeCheckFromInline);
#endif
// This was a dynamic closure call where the destination name was not
// known at compile-time. Thus, fetch the original arguments and arguments
// descriptor and re-do the type check in the runtime, which causes the
// error with the proper destination name to be thrown.
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
const auto& dispatcher =
Function::Handle(zone, caller_frame->LookupDartFunction());
ASSERT(dispatcher.IsInvokeFieldDispatcher());
const auto& orig_arguments_desc =
Array::Handle(zone, dispatcher.saved_args_desc());
const ArgumentsDescriptor args_desc(orig_arguments_desc);
const intptr_t arg_count = args_desc.CountWithTypeArgs();
const auto& orig_arguments = Array::Handle(zone, Array::New(arg_count));
auto& obj = Object::Handle(zone);
for (intptr_t i = 0; i < arg_count; i++) {
obj = *reinterpret_cast<ObjectPtr*>(
ParamAddress(caller_frame->fp(), arg_count - i));
orig_arguments.SetAt(i, obj);
}
const auto& receiver = Closure::CheckedHandle(
zone, orig_arguments.At(args_desc.FirstArgIndex()));
const auto& function = Function::Handle(zone, receiver.function());
const auto& result = Object::Handle(
zone, function.DoArgumentTypesMatch(orig_arguments, args_desc));
if (result.IsError()) {
Exceptions::PropagateError(Error::Cast(result));
}
// IsAssignableTo returned false, so we should have thrown a type
// error in DoArgumentsTypesMatch.
UNREACHABLE();
}
ASSERT(!dst_name.IsNull());
// Throw a dynamic type error.
const TokenPosition location = GetCallerLocation();
const auto& src_type =
AbstractType::Handle(zone, src_instance.GetType(Heap::kNew));
auto& reported_type = AbstractType::Handle(zone, dst_type.ptr());
if (!reported_type.IsInstantiated()) {
// Instantiate dst_type before reporting the error.
reported_type = reported_type.InstantiateFrom(instantiator_type_arguments,
function_type_arguments,
kAllFree, Heap::kNew);
}
Exceptions::CreateAndThrowTypeError(location, src_type, reported_type,
dst_name);
UNREACHABLE();
}
bool should_update_cache = true;
#if !defined(TARGET_ARCH_IA32)
bool would_update_cache_if_not_lazy = false;
#if !defined(DART_PRECOMPILED_RUNTIME)
// Checks against type parameters are done by loading the corresponding type
// argument at runtime and calling the type argument's TTS. Thus, we install
// specialized TTSes on the type argument, not the parameter itself.
auto& tts_type = AbstractType::Handle(zone, dst_type.ptr());
if (tts_type.IsTypeParameter()) {
const auto& param = TypeParameter::Cast(tts_type);
tts_type = param.GetFromTypeArguments(instantiator_type_arguments,
function_type_arguments);
}
ASSERT(!tts_type.IsTypeParameter());
if (mode == kTypeCheckFromLazySpecializeStub) {
if (FLAG_trace_type_checks) {
THR_Print(" Specializing type testing stub for %s\n",
tts_type.ToCString());
}
const Code& code = Code::Handle(
zone, TypeTestingStubGenerator::SpecializeStubFor(thread, tts_type));
tts_type.SetTypeTestingStub(code);
// Only create the cache if we failed to create a specialized TTS and doing
// the same check would cause an update to the cache.
would_update_cache_if_not_lazy =
(!src_instance.IsNull() &&
tts_type.type_test_stub() ==
StubCode::DefaultNullableTypeTest().ptr()) ||
tts_type.type_test_stub() == StubCode::DefaultTypeTest().ptr();
should_update_cache = would_update_cache_if_not_lazy && cache.IsNull();
}
// Since dst_type is not a top type or type parameter, then the only default
// stubs it can use are DefaultTypeTest or DefaultNullableTypeTest.
if ((mode == kTypeCheckFromSlowStub) &&
(tts_type.type_test_stub() != StubCode::DefaultNullableTypeTest().ptr() &&
tts_type.type_test_stub() != StubCode::DefaultTypeTest().ptr())) {
// The specialized type testing stub returned a false negative. That means
// the specialization may have been generated using outdated cid ranges and
// new classes appeared since the stub was generated. Try respecializing.
if (FLAG_trace_type_checks) {
THR_Print(" Rebuilding type testing stub for %s\n",
tts_type.ToCString());
}
const auto& old_code = Code::Handle(zone, tts_type.type_test_stub());
const auto& new_code = Code::Handle(
zone, TypeTestingStubGenerator::SpecializeStubFor(thread, tts_type));
ASSERT(old_code.ptr() != new_code.ptr());
// A specialized stub should always respecialize to a non-default stub.
ASSERT(new_code.ptr() != StubCode::DefaultNullableTypeTest().ptr() &&
new_code.ptr() != StubCode::DefaultTypeTest().ptr());
const auto& old_instructions =
Instructions::Handle(old_code.instructions());
const auto& new_instructions =
Instructions::Handle(new_code.instructions());
// Check if specialization produced exactly the same sequence of
// instructions. If it did, then we have a false negative, which can
// happen in some cases involving uninstantiated types. In these cases,
// update the cache, because the only case in which these false negatives
// could possibly turn into true positives is with reloads, which clear
// all the SubtypeTestCaches.
should_update_cache = old_instructions.Equals(new_instructions);
if (FLAG_trace_type_checks) {
THR_Print(" %s rebuilt type testing stub for %s\n",
should_update_cache ? "Discarding" : "Installing",
tts_type.ToCString());
}
if (!should_update_cache) {
tts_type.SetTypeTestingStub(new_code);
}
}
#endif // !defined(DART_PRECOMPILED_RUNTIME)
#endif // !defined(TARGET_ARCH_IA32)
if (should_update_cache) {
if (cache.IsNull()) {
#if !defined(TARGET_ARCH_IA32)
ASSERT(mode == kTypeCheckFromSlowStub ||
(mode == kTypeCheckFromLazySpecializeStub &&
would_update_cache_if_not_lazy));
// 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.GetObjectPool());
TypeTestingStubCallPattern tts_pattern(caller_frame->pc());
const intptr_t stc_pool_idx = tts_pattern.GetSubtypeTestCachePoolIndex();
// Ensure we do have a STC (lazily create it if not) and all threads use
// the same STC.
{
SafepointMutexLocker ml(isolate->group()->subtype_test_cache_mutex());
cache ^= pool.ObjectAt<std::memory_order_acquire>(stc_pool_idx);
if (cache.IsNull()) {
cache = SubtypeTestCache::New();
pool.SetObjectAt<std::memory_order_release>(stc_pool_idx, cache);
if (FLAG_trace_type_checks) {
THR_Print(" Installed new subtype test cache %#" Px
" at index %" Pd " of pool for %s\n",
static_cast<uword>(cache.ptr()), stc_pool_idx,
caller_code.ToCString());
}
}
}
#else
UNREACHABLE();
#endif
}
UpdateTypeTestCache(zone, thread, 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, Object::smi_zero());
args.SetAt(3, Object::smi_zero());
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));
Exceptions::CreateAndThrowTypeError(location, src_type, bool_interface,
Symbols::BooleanExpression());
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.
if (target_code.ptr() !=
CodePatcher::GetStaticCallTargetAt(caller_frame->pc(), caller_code)) {
GcSafepointOperationScope safepoint(thread);
if (target_code.ptr() !=
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;
}
#else
// 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);
Code& orig_stub = Code::Handle(zone);
orig_stub =
isolate->group()->debugger()->GetPatchedStubAddress(caller_frame->pc());
const Error& error =
Error::Handle(zone, isolate->debugger()->PauseBreakpoint());
ThrowIfError(error);
arguments.SetReturn(orig_stub);
}
#endif
DEFINE_RUNTIME_ENTRY(SingleStepHandler, 0) {
#if defined(PRODUCT) || defined(DART_PRECOMPILED_RUNTIME)
UNREACHABLE();
#else
const Error& error =
Error::Handle(zone, isolate->debugger()->PauseStepping());
ThrowIfError(error);
#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 Class& receiver_class,
const String& target_name,
const String& demangled,
const Array& arguments_descriptor,
Function* result) {
const String& getter_name = String::Handle(Field::GetterName(demangled));
const int kTypeArgsLen = 0;
const int kNumArguments = 1;
ArgumentsDescriptor args_desc(Array::Handle(
ArgumentsDescriptor::NewBoxed(kTypeArgsLen, kNumArguments)));
const Function& getter =
Function::Handle(Resolver::ResolveDynamicForReceiverClass(
receiver_class, getter_name, args_desc));
if (getter.IsNull() || getter.IsMethodExtractor()) {
return false;
}
// We do this on the target_name, _not_ on the demangled name, so that
// FlowGraphBuilder::BuildGraphOfInvokeFieldDispatcher can detect dynamic
// calls from the dyn: tag on the name of the dispatcher.
const Function& target_function =
Function::Handle(receiver_class.GetInvocationDispatcher(
target_name, arguments_descriptor,
UntaggedFunction::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",
receiver_class.ToCString(), receiver_class.id(),
target_function.IsNull() ? "null" : target_function.ToCString());
}
*result = target_function.ptr();
return true;
}
// Handle other invocations (implicit closures, noSuchMethod).
FunctionPtr InlineCacheMissHelper(const Class& receiver_class,
const Array& args_descriptor,
const String& target_name) {
// Create a demangled version of the target_name, if necessary, This is used
// for the field getter in ResolveCallThroughGetter and as the target name
// for the NoSuchMethod dispatcher (if needed).
const String* demangled = &target_name;
if (Function::IsDynamicInvocationForwarderName(target_name)) {
demangled = &String::Handle(
Function::DemangleDynamicInvocationForwarderName(target_name));
}
const bool is_getter = Field::IsGetterName(*demangled);
Function& result = Function::Handle();
if (is_getter ||
!ResolveCallThroughGetter(receiver_class, target_name, *demangled,
args_descriptor, &result)) {
ArgumentsDescriptor desc(args_descriptor);
const Function& target_function =
Function::Handle(receiver_class.GetInvocationDispatcher(
*demangled, args_descriptor,
UntaggedFunction::kNoSuchMethodDispatcher, FLAG_lazy_dispatchers));
if (FLAG_trace_ic) {
OS::PrintErr(
"NoSuchMethod IC miss: adding <%s> id:%" Pd " -> <%s>\n",
receiver_class.ToCString(), receiver_class.id(),
target_function.IsNull() ? "null" : target_function.ToCString());
}
result = target_function.ptr();
}
// May be null if --no-lazy-dispatchers, in which case dispatch will be
// handled by NoSuchMethodFromCallStub.
ASSERT(!result.IsNull() || !FLAG_lazy_dispatchers);
return result.ptr();
}
#if !defined(DART_PRECOMPILED_RUNTIME)
static void TrySwitchInstanceCall(Thread* thread,
StackFrame* caller_frame,
const Code& caller_code,
const Function& caller_function,
const ICData& ic_data,
const Function& target_function) {
auto zone = thread->zone();
// Monomorphic/megamorphic calls only check the receiver CID.
if (ic_data.NumArgsTested() != 1) return;
ASSERT(ic_data.rebind_rule() == ICData::kInstance);
// Monomorphic/megamorphic calls don't record exactness.
if (ic_data.is_tracking_exactness()) return;
#if !defined(PRODUCT)
// Monomorphic/megamorphic do not check the isolate's stepping flag.
if (Isolate::Current()->has_attempted_stepping()) return;
#endif
// Monomorphic/megamorphic calls are only for unoptimized code.
ASSERT(!caller_code.is_optimized());
// Code is detached from its function. This will prevent us from resetting
// the switchable call later because resets are function based and because
// the ic_data_array belongs to the function instead of the code. This should
// only happen because of reload, but it sometimes happens with KBC mixed mode
// probably through a race between foreground and background compilation.
if (caller_function.unoptimized_code() != caller_code.ptr()) {
return;
}
#if !defined(PRODUCT)
// Skip functions that contain breakpoints or when debugger is in single
// stepping mode.
if (thread->isolate_group()->debugger()->IsDebugging(thread,
caller_function)) {
return;
}
#endif
const intptr_t num_checks = ic_data.NumberOfChecks();
// Monomorphic call.
if (FLAG_unopt_monomorphic_calls && (num_checks == 1)) {
// A call site in the monomorphic state does not load the arguments
// descriptor, so do not allow transition to this state if the callee
// needs it.
if (target_function.PrologueNeedsArgumentsDescriptor()) {
return;
}
const Array& data = Array::Handle(zone, ic_data.entries());
const Code& target = Code::Handle(zone, target_function.EnsureHasCode());
CodePatcher::PatchInstanceCallAt(caller_frame->pc(), caller_code, data,
target);
if (FLAG_trace_ic) {
OS::PrintErr("Instance call at %" Px
" switching to monomorphic dispatch, %s\n",
caller_frame->pc(), ic_data.ToCString());
}
return; // Success.
}
// Megamorphic call.
if (FLAG_unopt_megamorphic_calls &&
(num_checks > FLAG_max_polymorphic_checks)) {
const String& name = String::Handle(zone, ic_data.target_name());
const Array& descriptor =
Array::Handle(zone, ic_data.arguments_descriptor());
const MegamorphicCache& cache = MegamorphicCache::Handle(
zone, MegamorphicCacheTable::Lookup(thread, name, descriptor));
ic_data.set_is_megamorphic(true);
CodePatcher::PatchInstanceCallAt(caller_frame->pc(), caller_code, cache,
StubCode::MegamorphicCall());
if (FLAG_trace_ic) {
OS::PrintErr("Instance call at %" Px
" switching to megamorphic dispatch, %s\n",
caller_frame->pc(), ic_data.ToCString());
}
return; // Success.
}
}
#endif // !defined(DART_PRECOMPILED_RUNTIME)
// Perform the subtype and return constant function based on the result.
static FunctionPtr ComputeTypeCheckTarget(const Instance& receiver,
const AbstractType& type,
const ArgumentsDescriptor& desc) {
const bool result = receiver.IsInstanceOf(type, Object::null_type_arguments(),
Object::null_type_arguments());
const ObjectStore* store = IsolateGroup::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.ptr();
}
static FunctionPtr Resolve(
Thread* thread,
Zone* zone,
const GrowableArray<const Instance*>& caller_arguments,
const Class& receiver_class,
const String& name,
const Array& descriptor) {
ASSERT(name.IsSymbol());
auto& target_function = Function::Handle(zone);
ArgumentsDescriptor args_desc(descriptor);
if (receiver_class.EnsureIsFinalized(thread) == Error::null()) {
target_function = Resolver::ResolveDynamicForReceiverClass(receiver_class,
name, args_desc);
}
if (caller_arguments.length() == 2 &&
target_function.ptr() == thread->isolate_group()
->object_store()
->simple_instance_of_function()) {
// Replace the target function with constant function.
const AbstractType& type = AbstractType::Cast(*caller_arguments[1]);
target_function =
ComputeTypeCheckTarget(*caller_arguments[0], type, args_desc);
}
if (target_function.IsNull()) {
target_function = InlineCacheMissHelper(receiver_class, descriptor, name);
}
if (target_function.IsNull()) {
ASSERT(!FLAG_lazy_dispatchers);
}
return target_function.ptr();
}
// 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(zone, arguments.ArgAt(0));
const ICData& ic_data = ICData::CheckedHandle(zone, 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(zone, ic_data.GetTargetAt(0));
target.EnsureHasCode();
ASSERT(!target.IsNull() && target.HasCode());
ic_data.EnsureHasReceiverCheck(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(zone, arguments.ArgAt(0));
const Instance& arg1 = Instance::CheckedHandle(zone, arguments.ArgAt(1));
const ICData& ic_data = ICData::CheckedHandle(zone, 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(zone, ic_data.GetTargetAt(0));
target.EnsureHasCode();
GrowableArray<intptr_t> cids(2);
cids.Add(arg0.GetClassId());
cids.Add(arg1.GetClassId());
ic_data.EnsureHasCheck(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(DART_PRECOMPILED_RUNTIME)
static bool IsSingleTarget(IsolateGroup* isolate_group,
Zone* zone,
intptr_t lower_cid,
intptr_t upper_cid,
const Function& target,
const String& name) {
Class& cls = Class::Handle(zone);
ClassTable* table = isolate_group->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,
/*allow_add=*/false);
if (other_target.ptr() != target.ptr()) {
return false;
}
}
return true;
}
class SavedUnlinkedCallMapKeyEqualsTraits : public AllStatic {
public:
static const char* Name() { return "SavedUnlinkedCallMapKeyEqualsTraits "; }
static bool ReportStats() { return false; }
static bool IsMatch(const Object& key1, const Object& key2) {
if (!key1.IsInteger() || !key2.IsInteger()) return false;
return Integer::Cast(key1).Equals(Integer::Cast(key2));
}
static uword Hash(const Object& key) {
return Integer::Cast(key).CanonicalizeHash();
}
};
using UnlinkedCallMap = UnorderedHashMap<SavedUnlinkedCallMapKeyEqualsTraits>;
static void SaveUnlinkedCall(Zone* zone,
Isolate* isolate,
uword frame_pc,
const UnlinkedCall& unlinked_call) {
IsolateGroup* isolate_group = isolate->group();
SafepointMutexLocker ml(isolate_group->unlinked_call_map_mutex());
if (isolate_group->saved_unlinked_calls() == Array::null()) {
const auto& initial_map =
Array::Handle(zone, HashTables::New<UnlinkedCallMap>(16, Heap::kOld));
isolate_group->set_saved_unlinked_calls(initial_map);
}
UnlinkedCallMap unlinked_call_map(zone,
isolate_group->saved_unlinked_calls());
const auto& pc = Integer::Handle(zone, Integer::NewFromUint64(frame_pc));
// Some other isolate might have updated unlinked_call_map[pc] too, but
// their update should be identical to ours.
const auto& new_or_old_value = UnlinkedCall::Handle(
zone, UnlinkedCall::RawCast(
unlinked_call_map.InsertOrGetValue(pc, unlinked_call)));
RELEASE_ASSERT(new_or_old_value.ptr() == unlinked_call.ptr());
isolate_group->set_saved_unlinked_calls(unlinked_call_map.Release());
}
static UnlinkedCallPtr LoadUnlinkedCall(Zone* zone,
Isolate* isolate,
uword pc) {
IsolateGroup* isolate_group = isolate->group();
SafepointMutexLocker ml(isolate_group->unlinked_call_map_mutex());
ASSERT(isolate_group->saved_unlinked_calls() != Array::null());
UnlinkedCallMap unlinked_call_map(zone,
isolate_group->saved_unlinked_calls());
const auto& pc_integer = Integer::Handle(zone, Integer::NewFromUint64(pc));
const auto& unlinked_call = UnlinkedCall::Cast(
Object::Handle(zone, unlinked_call_map.GetOrDie(pc_integer)));
isolate_group->set_saved_unlinked_calls(unlinked_call_map.Release());
return unlinked_call.ptr();
}
// NOTE: Right now we never delete [UnlinkedCall] objects. They are needed while
// a call site is in Unlinked/Monomorphic/MonomorphicSmiable/SingleTarget
// states.
//
// Theoretically we could free the [UnlinkedCall] object once we transition the
// call site to use ICData/MegamorphicCache, but that would require careful
// coordination between the deleter and a possible concurrent reader.
//
// To simplify the code we decided not to do that atm (only a very small
// fraction of callsites in AOT use switchable calls, the name/args-descriptor
// objects are kept alive anyways -> there is little memory savings from
// freeing the [UnlinkedCall] objects).
#endif // defined(DART_PRECOMPILED_RUNTIME)
enum class MissHandler {
kInlineCacheMiss,
kSwitchableCallMiss,
kFixCallersTargetMonomorphic,
};
// Handles updating of type feedback and possible patching of instance calls.
//
// It works in 3 separate steps:
// - resolve the actual target
// - update type feedback & (optionally) perform call site transition
// - return the right values
//
// Depending on the JIT/AOT mode we obtain current and patch new (target, data)
// differently:
//
// - JIT calls must be patched with CodePatcher::PatchInstanceCallAt()
// - AOT calls must be patched with CodePatcher::PatchSwitchableCallAt()
//
// Independent of which miss handler was used or how we will return, we look at
// current (target, data) and see if we need to transition the call site to a
// new (target, data). We do this while holding `IG->patchable_call_mutex()`.
//
// Depending on which miss handler got called we might need to return
// differently:
//
// - SwitchableCallMiss will get get (stub, data) return value
// - InlineCache*Miss will get get function as return value
//
class PatchableCallHandler {
public:
PatchableCallHandler(Thread* thread,
const GrowableArray<const Instance*>& caller_arguments,
MissHandler miss_handler,
NativeArguments arguments,
StackFrame* caller_frame,
const Code& caller_code,
const Function& caller_function)
: isolate_(thread->isolate()),
thread_(thread),
zone_(thread->zone()),
caller_arguments_(caller_arguments),
miss_handler_(miss_handler),
arguments_(arguments),
caller_frame_(caller_frame),
caller_code_(caller_code),
caller_function_(caller_function),
name_(String::Handle()),
args_descriptor_(Array::Handle()) {
// We only have two arg IC calls in JIT mode.
ASSERT(caller_arguments_.length() == 1 || !FLAG_precompiled_mode);
}
void ResolveSwitchAndReturn(const Object& data);
private:
FunctionPtr ResolveTargetFunction(const Object& data);
#if defined(DART_PRECOMPILED_RUNTIME)
void HandleMissAOT(const Object& old_data,
uword old_entry,
const Function& target_function);
void DoUnlinkedCallAOT(const UnlinkedCall& unlinked,
const Function& target_function);
void DoMonomorphicMissAOT(const Object& old_data,
const Function& target_function);
void DoSingleTargetMissAOT(const SingleTargetCache& data,
const Function& target_function);
void DoICDataMissAOT(const ICData& data, const Function& target_function);
bool CanExtendSingleTargetRange(const String& name,
const Function& old_target,
const Function& target_function,
intptr_t* lower,
intptr_t* upper);
#else
void HandleMissJIT(const Object& old_data,
const Code& old_target,
const Function& target_function);
void DoMonomorphicMissJIT(const Object& old_data,
const Function& target_function);
void DoICDataMissJIT(const ICData& data,
const Object& old_data,
const Function& target_function);
#endif // !defined(DART_PRECOMPILED_RUNTIME)
void DoMegamorphicMiss(const MegamorphicCache& data,
const Function& target_function);
void UpdateICDataWithTarget(const ICData& ic_data,
const Function& target_function);
void TrySwitch(const ICData& ic_data, const Function& target_function);
void ReturnAOT(const Code& stub, const Object& data);
void ReturnJIT(const Code& stub, const Object& data, const Function& target);
void ReturnJITorAOT(const Code& stub,
const Object& data,
const Function& target);
const Instance& receiver() { return *caller_arguments_[0]; }
bool should_consider_patching() {
// In AOT we use switchable calls.
if (FLAG_precompiled_mode) return true;
// In JIT instance calls use a different calling sequence in unoptimized vs
// optimized code (see [FlowGraphCompiler::EmitInstanceCallJIT] vs
// [FlowGraphCompiler::EmitOptimizedInstanceCall]).
//
// The [CodePatcher::GetInstanceCallAt], [CodePatcher::PatchInstanceCallAt]
// only recognize unoptimized call pattern.
//
// So we will not try to switch optimized instance calls.
return !caller_code_.is_optimized();
}
ICDataPtr NewICData();
ICDataPtr NewICDataWithTarget(intptr_t cid, const Function& target);
Isolate* isolate_;
Thread* thread_;
Zone* zone_;
const GrowableArray<const Instance*>& caller_arguments_;
MissHandler miss_handler_;
NativeArguments arguments_;
StackFrame* caller_frame_;
const Code& caller_code_;
const Function& caller_function_;
// Call-site information populated during resolution.
String& name_;
Array& args_descriptor_;
bool is_monomorphic_hit_ = false;
};
#if defined(DART_PRECOMPILED_RUNTIME)
void PatchableCallHandler::DoUnlinkedCallAOT(const UnlinkedCall& unlinked,
const Function& target_function) {
const auto& ic_data = ICData::Handle(
zone_,
target_function.IsNull()
? NewICData()
: NewICDataWithTarget(receiver().GetClassId(), target_function));
Object& object = Object::Handle(zone_, ic_data.ptr());
Code& code = Code::Handle(zone_, StubCode::ICCallThroughCode().ptr());
// If the target function has optional parameters or is generic, it's
// prologue requires ARGS_DESC_REG to be populated. Yet the switchable calls
// do not populate that on the call site, which is why we don't transition
// those call sites to monomorphic, but rather directly to call via stub
// (which will populate the ARGS_DESC_REG from the ICData).
//
// Because of this we also don't generate monomorphic checks for those
// functions.
if (!target_function.IsNull() &&
!target_function.PrologueNeedsArgumentsDescriptor()) {
// 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()));
if (unlinked.can_patch_to_monomorphic()) {
object = expected_cid.ptr();
code = target_code.ptr();
ASSERT(code.HasMonomorphicEntry());
} else {
object = MonomorphicSmiableCall::New(expected_cid.Value(), target_code);
code = StubCode::MonomorphicSmiableCheck().ptr();
}
}
CodePatcher::PatchSwitchableCallAt(caller_frame_->pc(), caller_code_, object,
code);
// Return the ICData. The miss stub will jump to continue in the IC lookup
// stub.
ReturnAOT(StubCode::ICCallThroughCode(), ic_data);
}
bool PatchableCallHandler::CanExtendSingleTargetRange(
const String& name,
const Function& old_target,
const Function& target_function,
intptr_t* lower,
intptr_t* upper) {
if (old_target.ptr() != target_function.ptr()) {
return false;
}
intptr_t unchecked_lower, unchecked_upper;
if (receiver().GetClassId() < *lower) {
unchecked_lower = receiver().GetClassId();
unchecked_upper = *lower - 1;
*lower = receiver().GetClassId();
} else {
unchecked_upper = receiver().GetClassId();
unchecked_lower = *upper + 1;
*upper = receiver().GetClassId();
}
return IsSingleTarget(isolate_->group(), zone_, unchecked_lower,
unchecked_upper, target_function, name);
}
#endif // defined(DART_PRECOMPILED_RUNTIME)
#if defined(DART_PRECOMPILED_RUNTIME)
void PatchableCallHandler::DoMonomorphicMissAOT(
const Object& old_data,
const Function& target_function) {
classid_t old_expected_cid;
if (old_data.IsSmi()) {
old_expected_cid = Smi::Cast(old_data).Value();
} else {
RELEASE_ASSERT(old_data.IsMonomorphicSmiableCall());
old_expected_cid = MonomorphicSmiableCall::Cast(old_data).expected_cid();
}
const bool is_monomorphic_hit = old_expected_cid == receiver().GetClassId();
const auto& old_receiver_class = Class::Handle(
zone_, isolate_->group()->class_table()->At(old_expected_cid));
const auto& old_target = Function::Handle(
zone_, Resolve(thread_, zone_, caller_arguments_, old_receiver_class,
name_, args_descriptor_));
const auto& ic_data = ICData::Handle(
zone_, old_target.IsNull()
? NewICData()
: NewICDataWithTarget(old_expected_cid, old_target));
if (is_monomorphic_hit) {
// The site just have been updated to monomorphic state with same
// exact class id - do nothing in that case: stub will call through ic data.
ReturnAOT(StubCode::ICCallThroughCode(), ic_data);
return;
}
intptr_t lower = old_expected_cid;
intptr_t upper = old_expected_cid;
if (CanExtendSingleTargetRange(name_, old_target, target_function, &lower,
&upper)) {
const SingleTargetCache& cache =
SingleTargetCache::Handle(zone_, SingleTargetCache::New());
const Code& code = Code::Handle(zone_, 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 = StubCode::SingleTargetCall();
CodePatcher::PatchSwitchableCallAt(caller_frame_->pc(), caller_code_, cache,
stub);
// Return the ICData. The miss stub will jump to continue in the IC call
// stub.
ReturnAOT(StubCode::ICCallThroughCode(), ic_data);
return;
}
// Patch to call through stub.
const Code& stub = StubCode::ICCallThroughCode();
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.
ReturnAOT(stub, ic_data);
}
#endif // defined(DART_PRECOMPILED_RUNTIME)
#if !defined(DART_PRECOMPILED_RUNTIME)
void PatchableCallHandler::DoMonomorphicMissJIT(
const Object& old_data,
const Function& target_function) {
// Monomorphic calls use the ICData::entries() as their data.
const auto& old_ic_data_entries = Array::Cast(old_data);
// Any non-empty ICData::entries() has a backref to it's ICData.
const auto& ic_data =
ICData::Handle(zone_, ICData::ICDataOfEntriesArray(old_ic_data_entries));
// The target didn't change, so we can stay inside monomorphic state.
if (ic_data.NumberOfChecksIs(1) &&
(ic_data.GetReceiverClassIdAt(0) == receiver().GetClassId())) {
// No need to update ICData - it's already up-to-date.
if (FLAG_trace_ic) {
OS::PrintErr("Instance call at %" Px
" updating code (old code was disabled)\n",
caller_frame_->pc());
}
// We stay in monomorphic state, patch the code object and reload the icdata
// entries array.
const auto& code = Code::Handle(zone_, target_function.EnsureHasCode());
const auto& data = Object::Handle(zone_, ic_data.entries());
CodePatcher::PatchInstanceCallAt(caller_frame_->pc(), caller_code_, data,
code);
ReturnJIT(code, data, target_function);
return;
}
ASSERT(ic_data.NumArgsTested() == 1);
const Code& stub = ic_data.is_tracking_exactness()
? StubCode::OneArgCheckInlineCacheWithExactnessCheck()
: StubCode::OneArgCheckInlineCache();
if (FLAG_trace_ic) {
OS::PrintErr("Instance call at %" Px
" switching monomorphic to polymorphic dispatch, %s\n",
caller_frame_->pc(), ic_data.ToCString());
}
CodePatcher::PatchInstanceCallAt(caller_frame_->pc(), caller_code_, ic_data,
stub);
ASSERT(caller_arguments_.length() == 1);
UpdateICDataWithTarget(ic_data, target_function);
ASSERT(should_consider_patching());
TrySwitchInstanceCall(thread_, caller_frame_, caller_code_, caller_function_,
ic_data, target_function);
ReturnJIT(stub, ic_data, target_function);
}
#endif // !defined(DART_PRECOMPILED_RUNTIME)
#if defined(DART_PRECOMPILED_RUNTIME)
void PatchableCallHandler::DoSingleTargetMissAOT(
const SingleTargetCache& data,
const Function& target_function) {
const Code& old_target_code = Code::Handle(zone_, data.target());
const Function& old_target =
Function::Handle(zone_, Function::RawCast(old_target_code.owner()));
// We lost the original ICData when we patched to the monomorphic case.
const auto& ic_data = ICData::Handle(
zone_,
target_function.IsNull()
? NewICData()
: NewICDataWithTarget(receiver().GetClassId(), target_function));
intptr_t lower = data.lower_limit();
intptr_t upper = data.upper_limit();
if (CanExtendSingleTargetRange(name_, old_target, target_function, &lower,
&upper)) {
data.set_lower_limit(lower);
data.set_upper_limit(upper);
// Return the ICData. The single target stub will jump to continue in the
// IC call stub.
ReturnAOT(StubCode::ICCallThroughCode(), ic_data);
return;
}
// Call site is not single target, switch to call using ICData.
const Code& stub = StubCode::ICCallThroughCode();
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.
ReturnAOT(stub, ic_data);
}
#endif // defined(DART_PRECOMPILED_RUNTIME)
#if defined(DART_PRECOMPILED_RUNTIME)
void PatchableCallHandler::DoICDataMissAOT(const ICData& ic_data,
const Function& target_function) {
const String& name = String::Handle(zone_, ic_data.target_name());
const Class& cls = Class::Handle(zone_, receiver().clazz());
ASSERT(!cls.IsNull());
const Array& descriptor =
Array::CheckedHandle(zone_, ic_data.arguments_descriptor());
ArgumentsDescriptor args_desc(descriptor);
if (FLAG_trace_ic || FLAG_trace_ic_miss_in_optimized) {
OS::PrintErr("ICData miss, class=%s, function<%" Pd ">=%s\n",
cls.ToCString(), args_desc.TypeArgsLen(), name.ToCString());
}
if (target_function.IsNull()) {
ReturnAOT(StubCode::NoSuchMethodDispatcher(), ic_data);
return;
}
const intptr_t number_of_checks = ic_data.NumberOfChecks();
if ((number_of_checks == 0) &&
(!FLAG_precompiled_mode || ic_data.receiver_cannot_be_smi()) &&
!target_function.PrologueNeedsArgumentsDescriptor()) {
// 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());
const Smi& expected_cid =
Smi::Handle(zone_, Smi::New(receiver().GetClassId()));
ASSERT(target_code.HasMonomorphicEntry());
CodePatcher::PatchSwitchableCallAt(caller_frame_->pc(), caller_code_,
expected_cid, target_code);
ReturnAOT(target_code, expected_cid);
} else {
ic_data.EnsureHasReceiverCheck(receiver().GetClassId(), target_function);
if (number_of_checks > FLAG_max_polymorphic_checks) {
// Switch to megamorphic call.
const MegamorphicCache& cache = MegamorphicCache::Handle(
zone_, MegamorphicCacheTable::Lookup(thread_, name, descriptor));
const Code& stub = StubCode::MegamorphicCall();
CodePatcher::PatchSwitchableCallAt(caller_frame_->pc(), caller_code_,
cache, stub);
ReturnAOT(stub, cache);
} else {
ReturnAOT(StubCode::ICCallThroughCode(), ic_data);
}
}
}
#endif // defined(DART_PRECOMPILED_RUNTIME)
#if !defined(DART_PRECOMPILED_RUNTIME)
void PatchableCallHandler::DoICDataMissJIT(const ICData& ic_data,
const Object& old_code,
const Function& target_function) {
ASSERT(ic_data.NumArgsTested() == caller_arguments_.length());
if (ic_data.NumArgsTested() == 1) {
ASSERT(old_code.ptr() == StubCode::OneArgCheckInlineCache().ptr() ||
old_code.ptr() ==
StubCode::OneArgCheckInlineCacheWithExactnessCheck().ptr() ||
old_code.ptr() ==
StubCode::OneArgOptimizedCheckInlineCache().ptr() ||
old_code.ptr() ==
StubCode::OneArgOptimizedCheckInlineCacheWithExactnessCheck()
.ptr() ||
old_code.ptr() == StubCode::ICCallBreakpoint().ptr() ||
(old_code.IsNull() && !should_consider_patching()));
UpdateICDataWithTarget(ic_data, target_function);
if (should_consider_patching()) {
TrySwitchInstanceCall(thread_, caller_frame_, caller_code_,
caller_function_, ic_data, target_function);
}
const Code& stub = Code::Handle(
zone_, ic_data.is_tracking_exactness()
? StubCode::OneArgCheckInlineCacheWithExactnessCheck().ptr()
: StubCode::OneArgCheckInlineCache().ptr());
ReturnJIT(stub, ic_data, target_function);
} else {
ASSERT(old_code.ptr() == StubCode::TwoArgsCheckInlineCache().ptr() ||
old_code.ptr() == StubCode::SmiAddInlineCache().ptr() ||
old_code.ptr() == StubCode::SmiLessInlineCache().ptr() ||
old_code.ptr() == StubCode::SmiEqualInlineCache().ptr() ||
old_code.ptr() ==
StubCode::TwoArgsOptimizedCheckInlineCache().ptr() ||
old_code.ptr() == StubCode::ICCallBreakpoint().ptr() ||
(old_code.IsNull() && !should_consider_patching()));
UpdateICDataWithTarget(ic_data, target_function);
ReturnJIT(StubCode::TwoArgsCheckInlineCache(), ic_data, target_function);
}
}
#endif // !defined(DART_PRECOMPILED_RUNTIME)
void PatchableCallHandler::DoMegamorphicMiss(const MegamorphicCache& data,
const Function& target_function) {
const String& name = String::Handle(zone_, data.target_name());
const Class& cls = Class::Handle(zone_, receiver().clazz());
ASSERT(!cls.IsNull());
const Array& descriptor =
Array::CheckedHandle(zone_, data.arguments_descriptor());
ArgumentsDescriptor args_desc(descriptor);
if (FLAG_trace_ic || FLAG_trace_ic_miss_in_optimized) {
OS::PrintErr("Megamorphic miss, class=%s, function<%" Pd ">=%s\n",
cls.ToCString(), args_desc.TypeArgsLen(), name.ToCString());
}
if (target_function.IsNull()) {
ReturnJITorAOT(StubCode::NoSuchMethodDispatcher(), data, target_function);
return;
}
// Insert function found into cache.
const Smi& class_id = Smi::Handle(zone_, Smi::New(cls.id()));
data.EnsureContains(class_id, target_function);
ReturnJITorAOT(StubCode::MegamorphicCall(), data, target_function);
}
void PatchableCallHandler::UpdateICDataWithTarget(
const ICData& ic_data,
const Function& target_function) {
if (target_function.IsNull()) return;
// If, upon return of the runtime, we will invoke the target directly we have
// to increment the call count here in the ICData.
// If we instead only insert a new ICData entry and will return to the IC stub
// which will call the target, the stub will take care of the increment.
const bool call_target_directly =
miss_handler_ == MissHandler::kInlineCacheMiss;
const intptr_t invocation_count = call_target_directly ? 1 : 0;
if (caller_arguments_.length() == 1) {
auto exactness = StaticTypeExactnessState::NotTracking();
#if !defined(DART_PRECOMPILED_RUNTIME)
if (ic_data.is_tracking_exactness()) {
exactness = receiver().IsNull()
? StaticTypeExactnessState::NotExact()
: StaticTypeExactnessState::Compute(
Type::Cast(AbstractType::Handle(
ic_data.receivers_static_type())),
receiver());
}
#endif // !defined(DART_PRECOMPILED_RUNTIME)
ic_data.EnsureHasReceiverCheck(receiver().GetClassId(), target_function,
invocation_count, exactness);
} else {
GrowableArray<intptr_t> class_ids(caller_arguments_.length());
ASSERT(ic_data.NumArgsTested() == caller_arguments_.length());
for (intptr_t i = 0; i < caller_arguments_.length(); i++) {
class_ids.Add(caller_arguments_[i]->GetClassId());
}
ic_data.EnsureHasCheck(class_ids, target_function, invocation_count);
}
}
void PatchableCallHandler::ReturnAOT(const Code& stub, const Object& data) {
ASSERT(miss_handler_ == MissHandler::kSwitchableCallMiss);
arguments_.SetArgAt(0, stub); // Second return value.
arguments_.SetReturn(data);
}
void PatchableCallHandler::ReturnJIT(const Code& stub,
const Object& data,
const Function& target) {
// In JIT we can have two different miss handlers to which we return slightly
// differently.
switch (miss_handler_) {
case MissHandler::kSwitchableCallMiss: {
arguments_.SetArgAt(0, stub); // Second return value.
arguments_.SetReturn(data);
break;
}
case MissHandler::kFixCallersTargetMonomorphic: {
arguments_.SetArgAt(1, data); // Second return value.
arguments_.SetReturn(stub);
break;
}
case MissHandler::kInlineCacheMiss: {
arguments_.SetReturn(target);
break;
}
}
}
void PatchableCallHandler::ReturnJITorAOT(const Code& stub,
const Object& data,
const Function& target) {
#if defined(DART_PRECOMPILED_MODE)
ReturnAOT(stub, data);
#else
ReturnJIT(stub, data, target);
#endif
}
ICDataPtr PatchableCallHandler::NewICData() {
return ICData::New(caller_function_, name_, args_descriptor_, DeoptId::kNone,
/*num_args_tested=*/1, ICData::kInstance);
}
ICDataPtr PatchableCallHandler::NewICDataWithTarget(intptr_t cid,
const Function& target) {
GrowableArray<intptr_t> cids(1);
cids.Add(cid);
return ICData::NewWithCheck(caller_function_, name_, args_descriptor_,
DeoptId::kNone, /*num_args_tested=*/1,
ICData::kInstance, &cids, target);
}
FunctionPtr PatchableCallHandler::ResolveTargetFunction(const Object& data) {
switch (data.GetClassId()) {
case kUnlinkedCallCid: {
const auto& unlinked_call = UnlinkedCall::Cast(data);
#if defined(DART_PRECOMPILED_RUNTIME)
// When transitioning out of UnlinkedCall to other states (e.g.
// Monomorphic, MonomorphicSmiable, SingleTarget) we lose
// name/arg-descriptor in AOT mode and cannot recover it.
//
// Even if we could recover an old target function (which was missed) -
// which we cannot in AOT bare mode - we can still lose the name due to a
// dyn:* call site potentially targeting non-dyn:* targets.
//
// => We will therefore retain the unlinked call here.
//
// In JIT mode we always use ICData from the call site, which has the
// correct name/args-descriptor.
SaveUnlinkedCall(zone_, isolate_, caller_frame_->pc(), unlinked_call);
#endif // defined(DART_PRECOMPILED_RUNTIME)
name_ = unlinked_call.target_name();
args_descriptor_ = unlinked_call.arguments_descriptor();
break;
}
case kMonomorphicSmiableCallCid:
FALL_THROUGH;
#if defined(DART_PRECOMPILED_RUNTIME)
case kSmiCid:
FALL_THROUGH;
case kSingleTargetCacheCid: {
const auto& unlinked_call = UnlinkedCall::Handle(
zone_, LoadUnlinkedCall(zone_, isolate_, caller_frame_->pc()));
name_ = unlinked_call.target_name();
args_descriptor_ = unlinked_call.arguments_descriptor();
break;
}
#else
case kArrayCid: {
// Monomorphic calls use the ICData::entries() as their data.
const auto& ic_data_entries = Array::Cast(data);
// Any non-empty ICData::entries() has a backref to it's ICData.
const auto& ic_data =
ICData::Handle(zone_, ICData::ICDataOfEntriesArray(ic_data_entries));
args_descriptor_ = ic_data.arguments_descriptor();
name_ = ic_data.target_name();
break;
}
#endif // defined(DART_PRECOMPILED_RUNTIME)
case kICDataCid:
FALL_THROUGH;
case kMegamorphicCacheCid: {
const CallSiteData& call_site_data = CallSiteData::Cast(data);
name_ = call_site_data.target_name();
args_descriptor_ = call_site_data.arguments_descriptor();
break;
}
default:
UNREACHABLE();
}
const Class& cls = Class::Handle(zone_, receiver().clazz());
return Resolve(thread_, zone_, caller_arguments_, cls, name_,
args_descriptor_);
}
void PatchableCallHandler::ResolveSwitchAndReturn(const Object& old_data) {
// Find out actual target (which can be time consuminmg) without holding any
// locks.
const auto& target_function =
Function::Handle(zone_, ResolveTargetFunction(old_data));
auto& data = Object::Handle(zone_);
// We ensure any transition in a patchable calls are done in an atomic
// manner, we ensure we always transition forward (e.g. Monomorphic ->
// Polymorphic).
//
// Mutators are only stopped if we actually need to patch a patchable call.
// We may not do that if we e.g. just add one more check to an ICData.
SafepointMutexLocker ml(thread_->isolate_group()->patchable_call_mutex());
#if defined(DART_PRECOMPILED_RUNTIME)
data =
CodePatcher::GetSwitchableCallDataAt(caller_frame_->pc(), caller_code_);
uword target_entry = 0;
DEBUG_ONLY(target_entry = CodePatcher::GetSwitchableCallTargetEntryAt(
caller_frame_->pc(), caller_code_));
HandleMissAOT(data, target_entry, target_function);
#else
auto& code = Code::Handle(zone_);
if (should_consider_patching()) {
code ^= CodePatcher::GetInstanceCallAt(caller_frame_->pc(), caller_code_,
&data);
} else {
ASSERT(old_data.IsICData() || old_data.IsMegamorphicCache());
data = old_data.ptr();
}
HandleMissJIT(data, code, target_function);
#endif
}
#if defined(DART_PRECOMPILED_RUNTIME)
void PatchableCallHandler::HandleMissAOT(const Object& old_data,
uword old_entry,
const Function& target_function) {
switch (old_data.GetClassId()) {
case kUnlinkedCallCid:
ASSERT(old_entry ==
StubCode::SwitchableCallMiss().MonomorphicEntryPoint());
DoUnlinkedCallAOT(UnlinkedCall::Cast(old_data), target_function);
break;
case kMonomorphicSmiableCallCid:
ASSERT(old_entry ==
StubCode::MonomorphicSmiableCheck().MonomorphicEntryPoint());
FALL_THROUGH;
case kSmiCid:
DoMonomorphicMissAOT(old_data, target_function);
break;
case kSingleTargetCacheCid:
ASSERT(old_entry == StubCode::SingleTargetCall().MonomorphicEntryPoint());
DoSingleTargetMissAOT(SingleTargetCache::Cast(old_data), target_function);
break;
case kICDataCid:
ASSERT(old_entry ==
StubCode::ICCallThroughCode().MonomorphicEntryPoint());
DoICDataMissAOT(ICData::Cast(old_data), target_function);
break;
case kMegamorphicCacheCid:
ASSERT(old_entry == StubCode::MegamorphicCall().MonomorphicEntryPoint());
DoMegamorphicMiss(MegamorphicCache::Cast(old_data), target_function);
break;
default:
UNREACHABLE();
}
}
#else
void PatchableCallHandler::HandleMissJIT(const Object& old_data,
const Code& old_code,
const Function& target_function) {
switch (old_data.GetClassId()) {
case kArrayCid:
// ICData three-element array: Smi(receiver CID), Smi(count),
// Function(target). It is the Array from ICData::entries_.
DoMonomorphicMissJIT(old_data, target_function);
break;
case kICDataCid:
DoICDataMissJIT(ICData::Cast(old_data), old_code, target_function);
break;
case kMegamorphicCacheCid:
ASSERT(old_code.ptr() == StubCode::MegamorphicCall().ptr() ||
(old_code.IsNull() && !should_consider_patching()));
DoMegamorphicMiss(MegamorphicCache::Cast(old_data), target_function);
break;
default:
UNREACHABLE();
}
}
#endif // defined(DART_PRECOMPILED_RUNTIME)
static void InlineCacheMissHandler(Thread* thread,
Zone* zone,
const GrowableArray<const Instance*>& args,
const ICData& ic_data,
NativeArguments native_arguments) {
#if !defined(DART_PRECOMPILED_RUNTIME)
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
const auto& caller_code = Code::Handle(zone, caller_frame->LookupDartCode());
const auto& caller_function =
Function::Handle(zone, caller_frame->LookupDartFunction());
PatchableCallHandler handler(thread, args, MissHandler::kInlineCacheMiss,
native_arguments, caller_frame, caller_code,
caller_function);
handler.ResolveSwitchAndReturn(ic_data);
#else
UNREACHABLE();
#endif // !defined(DART_PRECOMPILED_RUNTIME)
}
// 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(zone, arguments.ArgAt(0));
const ICData& ic_data = ICData::CheckedHandle(zone, arguments.ArgAt(1));
RELEASE_ASSERT(!FLAG_precompiled_mode);
GrowableArray<const Instance*> args(1);
args.Add(&receiver);
InlineCacheMissHandler(thread, zone, args, ic_data, arguments);
}
// 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(zone, arguments.ArgAt(0));
const Instance& other = Instance::CheckedHandle(zone, arguments.ArgAt(1));
const ICData& ic_data = ICData::CheckedHandle(zone, arguments.ArgAt(2));
RELEASE_ASSERT(!FLAG_precompiled_mode);
GrowableArray<const Instance*> args(2);
args.Add(&receiver);
args.Add(&other);
InlineCacheMissHandler(thread, zone, args, ic_data, arguments);
}
// Handle the first use of an instance call
// Arg1: Receiver.
// Arg0: Stub out.
// Returns: the ICData used to continue with the call.
DEFINE_RUNTIME_ENTRY(SwitchableCallMiss, 2) {
const Instance& receiver = Instance::CheckedHandle(zone, arguments.ArgAt(1));
StackFrameIterator iterator(ValidationPolicy::kDontValidateFrames, thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* exit_frame = iterator.NextFrame();
ASSERT(exit_frame->IsExitFrame());
StackFrame* miss_handler_frame = iterator.NextFrame();
// This runtime entry can be called either from miss stub or from
// switchable_call_miss "dart" stub/function set up in
// [MegamorphicCacheTable::InitMissHandler].
ASSERT(miss_handler_frame->IsStubFrame() ||
miss_handler_frame->IsDartFrame());
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());
auto& old_data = Object::Handle(zone);
#if defined(DART_PRECOMPILED_RUNTIME)
old_data =
CodePatcher::GetSwitchableCallDataAt(caller_frame->pc(), caller_code);
#else
CodePatcher::GetInstanceCallAt(caller_frame->pc(), caller_code, &old_data);
#endif
GrowableArray<const Instance*> caller_arguments(1);
caller_arguments.Add(&receiver);
PatchableCallHandler handler(thread, caller_arguments,
MissHandler::kSwitchableCallMiss, arguments,
caller_frame, caller_code, caller_function);
handler.ResolveSwitchAndReturn(old_data);
}
// Used to find the correct receiver and function to invoke or to fall back to
// invoking noSuchMethod when lazy dispatchers are disabled. Returns the
// result of the invocation or an Error.
static ObjectPtr InvokeCallThroughGetterOrNoSuchMethod(
Thread* thread,
Zone* zone,
const Instance& receiver,
const String& target_name,
const Array& orig_arguments,
const Array& orig_arguments_desc) {
ASSERT(!FLAG_lazy_dispatchers);
const bool is_dynamic_call =
Function::IsDynamicInvocationForwarderName(target_name);
String& demangled_target_name = String::Handle(zone, target_name.ptr());
if (is_dynamic_call) {
demangled_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.
const bool is_getter = Field::IsGetterName(demangled_target_name);
if (is_getter) {
// Tear-off of a method
// o.foo (o.get:foo) failed, closurize o.foo() if it exists.
const auto& function_name =
String::Handle(zone, Field::NameFromGetter(demangled_target_name));
while (!cls.IsNull()) {
// We don't generate dyn:* forwarders for method extractors so there is no
// need to try to find a dyn:get:foo first (see assertion below)
if (function.IsNull()) {
if (cls.EnsureIsFinalized(thread) == Error::null()) {
function = Resolver::ResolveDynamicFunction(zone, cls, function_name);
}
}
if (!function.IsNull()) {
#if !defined(DART_PRECOMPILED_RUNTIME)
ASSERT(!kernel::NeedsDynamicInvocationForwarder(Function::Handle(
function.GetMethodExtractor(demangled_target_name))));
#endif
const Function& closure_function =
Function::Handle(zone, function.ImplicitClosureFunction());
const Object& result = Object::Handle(
zone, closure_function.ImplicitInstanceClosure(receiver));
return result.ptr();
}
cls = cls.SuperClass();
}
// Fall through for noSuchMethod
} else {
// Call through field.
// o.foo(...) failed, invoke noSuchMethod is foo exists but has the wrong
// number of arguments, or try (o.foo).call(...)
if ((target_name.ptr() == Symbols::Call().ptr()) && 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.
return DartEntry::InvokeClosure(thread, orig_arguments,
orig_arguments_desc);
}
// Dynamic call sites have to use the dynamic getter as well (if it was
// created).
const auto& getter_name =
String::Handle(zone, Field::GetterName(demangled_target_name));
const auto& dyn_getter_name = String::Handle(
zone, is_dynamic_call
? Function::CreateDynamicInvocationForwarderName(getter_name)
: getter_name.ptr());
ArgumentsDescriptor args_desc(orig_arguments_desc);
while (!cls.IsNull()) {
// If there is a function with the target name but mismatched arguments
// we need to call `receiver.noSuchMethod()`.
if (cls.EnsureIsFinalized(thread) == Error::null()) {
function = Resolver::ResolveDynamicFunction(zone, cls, target_name);
}
if (!function.IsNull()) {
ASSERT(!function.AreValidArguments(args_desc, NULL));
break; // mismatch, invoke noSuchMethod
}
if (is_dynamic_call) {
function =
Resolver::ResolveDynamicFunction(zone, cls, demangled_target_name);
if (!function.IsNull()) {
ASSERT(!function.AreValidArguments(args_desc, NULL));
break; // mismatch, invoke noSuchMethod
}
}
// If there is a getter we need to call-through-getter.
if (is_dynamic_call) {
function = Resolver::ResolveDynamicFunction(zone, cls, dyn_getter_name);
}
if (function.IsNull()) {
function = Resolver::ResolveDynamicFunction(zone, cls, 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));
if (getter_result.IsError()) {
return getter_result.ptr();
}
ASSERT(getter_result.IsNull() || getter_result.IsInstance());
orig_arguments.SetAt(args_desc.FirstArgIndex(), getter_result);
return DartEntry::InvokeClosure(thread, orig_arguments,
orig_arguments_desc);
}
cls = cls.SuperClass();
}
}
const Object& result = Object::Handle(
zone,
DartEntry::InvokeNoSuchMethod(thread, receiver, demangled_target_name,
orig_arguments, orig_arguments_desc));
return result.ptr();
}
// Invoke appropriate noSuchMethod or closure from getter.
// Arg0: receiver
// Arg1: ICData or MegamorphicCache
// Arg2: arguments descriptor array
// Arg3: arguments array
DEFINE_RUNTIME_ENTRY(NoSuchMethodFromCallStub, 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();
}
const auto& result =
Object::Handle(zone, InvokeCallThroughGetterOrNoSuchMethod(
thread, zone, receiver, target_name,
orig_arguments, orig_arguments_desc));
ThrowIfError(result);
arguments.SetReturn(result);
}
// Invoke appropriate noSuchMethod function.
// Arg0: receiver
// Arg1: function
// Arg1: arguments descriptor array.
// Arg3: arguments array.
DEFINE_RUNTIME_ENTRY(NoSuchMethodFromPrologue, 4) {
const Instance& receiver = Instance::CheckedHandle(zone, arguments.ArgAt(0));
const Function& function = Function::CheckedHandle(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& orig_function_name = String::Handle(zone);
if ((function.kind() == UntaggedFunction::kClosureFunction) ||
(function.kind() == UntaggedFunction::kImplicitClosureFunction)) {
// For closure the function name is always 'call'. Replace it with the
// name of the closurized function so that exception contains more
// relevant information.
orig_function_name = function.QualifiedUserVisibleName();
} else {
orig_function_name = function.name();
}
const Object& result = Object::Handle(
zone, DartEntry::InvokeNoSuchMethod(thread, receiver, orig_function_name,
orig_arguments, orig_arguments_desc));
ThrowIfError(result);
arguments.SetReturn(result);
}
#if !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
// The following code is used to stress test
// - deoptimization
// - debugger stack tracing
// - garbage collection
// - hot reload
static void HandleStackOverflowTestCases(Thread* thread) {
auto isolate = thread->isolate();
auto isolate_group = thread->isolate_group();
if (FLAG_shared_slow_path_triggers_gc) {
isolate->group()->heap()->CollectAllGarbage();
}
bool do_deopt = false;
bool do_stacktrace = false;
bool do_reload = false;
bool do_gc = false;
const intptr_t isolate_reload_every =
isolate->group()->reload_every_n_stack_overflow_checks();
if ((FLAG_deoptimize_every > 0) || (FLAG_stacktrace_every > 0) ||
(FLAG_gc_every > 0) || (isolate_reload_every > 0)) {
if (!Isolate::IsSystemIsolate(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 (FLAG_gc_every > 0 && (count % FLAG_gc_every) == 0) {
do_gc = true;
}
if ((isolate_reload_every > 0) && (count % isolate_reload_every) == 0) {
do_reload = isolate->group()->CanReload();
}
}
}
if ((FLAG_deoptimize_filter != nullptr) ||
(FLAG_stacktrace_filter != nullptr) || (FLAG_reload_every != 0)) {
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* frame = iterator.NextFrame();
ASSERT(frame != nullptr);
Code& code = Code::Handle();
Function& function = Function::Handle();
code = frame->LookupDartCode();
ASSERT(!code.IsNull());
function = code.function();
ASSERT(!function.IsNull());
const char* function_name = nullptr;
if ((FLAG_deoptimize_filter != nullptr) ||
(FLAG_stacktrace_filter != nullptr)) {
function_name = function.ToFullyQualifiedCString();
ASSERT(function_name != nullptr);
}
if (!code.IsNull()) {
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 != nullptr &&
strstr(function_name, FLAG_deoptimize_filter) != nullptr &&
!function.ForceOptimize()) {
OS::PrintErr("*** Forcing deoptimization (%s)\n",
function.ToFullyQualifiedCString());
do_deopt = true;
}
}
if (FLAG_stacktrace_filter != nullptr &&
strstr(function_name, FLAG_stacktrace_filter) != nullptr) {
OS::PrintErr("*** Computing stacktrace (%s)\n",
function.ToFullyQualifiedCString());
do_stacktrace = true;
}
}
if (do_deopt) {
// TODO(turnidge): Consider using DeoptimizeAt instead.
DeoptimizeFunctionsOnStack();
}
if (do_reload) {
// Maybe adjust the rate of future reloads.
isolate_group->MaybeIncreaseReloadEveryNStackOverflowChecks();
// Issue a reload.
const char* script_uri = isolate_group->source()->script_uri;
JSONStream js;
const bool success =
isolate_group->ReloadSources(&js, /*force_reload=*/true, 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();
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);
int num_vars = 0;
// Variable locations and number are unknown when precompiling.
#if !defined(DART_PRECOMPILED_RUNTIME)
if (!frame->function().ForceOptimize()) {
// Ensure that we have unoptimized code.
frame->function().EnsureHasCompiledUnoptimizedCode();
num_vars = frame->NumLocalVariables();
}
#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) {
DebuggerStackTrace::CollectAwaiterReturn();
}
}
if (do_gc) {
isolate->group()->heap()->CollectAllGarbage(GCReason::kDebugging);
}
}
#endif // !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
#if !defined(DART_PRECOMPILED_RUNTIME)
static void HandleOSRRequest(Thread* thread) {
auto isolate_group = thread->isolate_group();
ASSERT(isolate_group->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.ptr() != 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));
ThrowIfError(result);
if (!result.IsNull()) {
const Code& code = Code::Cast(result);
uword optimized_entry = code.EntryPoint();
frame->set_pc(optimized_entry);
frame->set_pc_marker(code.ptr());
}
}
#endif // !defined(DART_PRECOMPILED_RUNTIME)
DEFINE_RUNTIME_ENTRY(StackOverflow, 0) {
#if defined(USING_SIMULATOR)
uword stack_pos = Simulator::Current()->get_sp();
// If simulator was never called it may return 0 as a value of SPREG.
if (stack_pos == 0) {
// Use any reasonable value which would not be treated
// as stack overflow.
stack_pos = thread->saved_stack_limit();
}
#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 an interrupt happens at the same time as a stack overflow, we
// process the stack overflow now and leave the interrupt for next
// time.
if (!thread->os_thread()->HasStackHeadroom() ||
IsCalleeFrameOf(thread->saved_stack_limit(), stack_pos)) {
if (FLAG_verbose_stack_overflow) {
OS::PrintErr("Stack overflow\n");
OS::PrintErr(" Native SP = %" Px ", stack limit = %" Px "\n", stack_pos,
thread->saved_stack_limit());
OS::PrintErr("Call stack:\n");
OS::PrintErr("size | frame\n");
StackFrameIterator frames(ValidationPolicy::kDontValidateFrames, thread,
StackFrameIterator::kNoCrossThreadIteration);
uword fp = stack_pos;
StackFrame* frame = frames.NextFrame();
while (frame != NULL) {
uword delta = (frame->fp() - fp);
fp = frame->fp();
OS::PrintErr("%4" Pd " %s\n", delta, frame->ToCString());
frame = frames.NextFrame();
}
}
// Use the preallocated stack overflow exception to avoid calling
// into dart code.
const Instance& exception =
Instance::Handle(isolate->group()->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());
ThrowIfError(error);
#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(zone, arguments.ArgAt(0));
const Function& function = Function::CheckedHandle(zone, arguments.ArgAt(1));
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* frame = iterator.NextFrame();
ASSERT(frame != NULL);
OS::PrintErr(
"IC call @%#" Px ": ICData: %#" Px " cnt:%" Pd " nchecks: %" Pd " %s\n",
frame->pc(), static_cast<uword>(ic_data.ptr()), 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());
ASSERT(function.HasCode());
if (Compiler::CanOptimizeFunction(thread, function)) {
auto isolate_group = thread->isolate_group();
if (FLAG_background_compilation) {
if (isolate_group->background_compiler()->EnqueueCompilation(function)) {
// Reduce the chance of triggering a compilation while the function is
// being compiled in the background. INT32_MIN should ensure that it
// takes long time to trigger a compilation.
// Note that the background compilation queue rejects duplicate entries.
function.SetUsageCounter(INT32_MIN);
// 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());
}
}
Object& result = Object::Handle(
zone, Compiler::CompileOptimizedFunction(thread, function));
ThrowIfError(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());
RELEASE_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 " (%s)\n",
frame->pc(), target_function.ToFullyQualifiedCString(),
current_target_code.EntryPoint(),
current_target_code.is_optimized() ? "optimized" : "unoptimized");
}
arguments.SetReturn(current_target_code);
#else
UNREACHABLE();
#endif
}
// The caller must be a monomorphic call from unoptimized code.
// Patch call to point to new target.
DEFINE_RUNTIME_ENTRY(FixCallersTargetMonomorphic, 2) {
#if !defined(DART_PRECOMPILED_RUNTIME)
const Instance& receiver = Instance::CheckedHandle(zone, arguments.ArgAt(0));
const Array& switchable_call_data =
Array::CheckedHandle(zone, arguments.ArgAt(1));
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
const auto& caller_code = Code::Handle(zone, caller_frame->LookupDartCode());
const auto& caller_function =
Function::Handle(zone, caller_frame->LookupDartFunction());
GrowableArray<const Instance*> caller_arguments(1);
caller_arguments.Add(&receiver);
PatchableCallHandler handler(
thread, caller_arguments, MissHandler::kFixCallersTargetMonomorphic,
arguments, caller_frame, caller_code, caller_function);
handler.ResolveSwitchAndReturn(switchable_call_data);
#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(Thread* mutator_thread,
const Code& optimized_code,
StackFrame* frame) {
ASSERT(optimized_code.is_optimized());
// Force-optimized code is optimized code which cannot deoptimize and doesn't
// have unoptimized code to fall back to.
ASSERT(!optimized_code.is_force_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 (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.
mutator_thread->pending_deopts().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);
}
}
// 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() {
auto thread = Thread::Current();
// Have to grab program_lock before stopping everybody else.
SafepointWriteRwLocker ml(thread, thread->isolate_group()->program_lock());
auto isolate_group = thread->isolate_group();
isolate_group->RunWithStoppedMutators([&]() {
Code& optimized_code = Code::Handle();
isolate_group->ForEachIsolate(
[&](Isolate* isolate) {
auto mutator_thread = isolate->mutator_thread();
DartFrameIterator iterator(
mutator_thread, StackFrameIterator::kAllowCrossThreadIteration);
StackFrame* frame = iterator.NextFrame();
while (frame != nullptr) {
optimized_code = frame->LookupDartCode();
if (optimized_code.is_optimized() &&
!optimized_code.is_force_optimized()) {
DeoptimizeAt(mutator_thread, optimized_code, frame);
}
frame = iterator.NextFrame();
}
},
/*at_safepoint=*/true);
});
}
static void DeoptimizeLastDartFrameIfOptimized() {
auto thread = Thread::Current();
// Have to grab program_lock before stopping everybody else.
SafepointWriteRwLocker ml(thread, thread->isolate_group()->program_lock());
auto isolate = thread->isolate();
auto isolate_group = thread->isolate_group();
isolate_group->RunWithStoppedMutators([&]() {
auto mutator_thread = isolate->mutator_thread();
DartFrameIterator iterator(mutator_thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* frame = iterator.NextFrame();
if (frame != nullptr) {
const auto& optimized_code = Code::Handle(frame->LookupDartCode());
if (optimized_code.is_optimized() &&
!optimized_code.is_force_optimized()) {
DeoptimizeAt(mutator_thread, optimized_code, frame);
}
}
});
}
#if !defined(DART_PRECOMPILED_RUNTIME)
static const intptr_t kNumberOfSavedCpuRegisters = kNumberOfCpuRegisters;
static const intptr_t kNumberOfSavedFpuRegisters = kNumberOfFpuRegisters;
static void CopySavedRegisters(uword saved_registers_address,
fpu_register_t** fpu_registers,
intptr_t** cpu_registers) {
// Tell MemorySanitizer this region is initialized by generated code. This
// region isn't already (fully) unpoisoned by FrameSetIterator::Unpoison
// because it is in an exit frame and stack frame iteration doesn't have
// access to true SP for exit frames.
MSAN_UNPOISON(reinterpret_cast<void*>(saved_registers_address),
kNumberOfSavedFpuRegisters * kFpuRegisterSize +
kNumberOfSavedCpuRegisters * kWordSize);
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++) {
fpu_registers_copy[i] =
*reinterpret_cast<fpu_register_t*>(saved_registers_address);
saved_registers_address += kFpuRegisterSize;
}
*fpu_registers = fpu_registers_copy;
ASSERT(sizeof(intptr_t) == kWordSize);
intptr_t* cpu_registers_copy = new intptr_t[kNumberOfSavedCpuRegisters];
ASSERT(cpu_registers_copy != NULL);
for (intptr_t i = 0; i < kNumberOfSavedCpuRegisters; i++) {
cpu_registers_copy[i] =
*reinterpret_cast<intptr_t*>(saved_registers_address);
saved_registers_address += kWordSize;
}
*cpu_registers = cpu_registers_copy;
}
#endif
// Copies saved registers and caller's frame into temporary buffers.
// Returns the stack size of unoptimized frame.
// The calling code must be optimized, but its function may not have
// have optimized code if the code is OSR code, or if the code was invalidated
// through class loading/finalization or field guard.
DEFINE_LEAF_RUNTIME_ENTRY(intptr_t,
DeoptimizeCopyFrame,
2,
uword saved_registers_address,
uword is_lazy_deopt) {
#if !defined(DART_PRECOMPILED_RUNTIME)
Thread* thread = Thread::Current();
Isolate* isolate = thread->isolate();
StackZone zone(thread);
// All registers have been saved below last-fp as if they were locals.
const uword last_fp =
saved_registers_address + (kNumberOfSavedCpuRegisters * kWordSize) +
(kNumberOfSavedFpuRegisters * kFpuRegisterSize) -
((runtime_frame_layout.first_local_from_fp + 1) * kWordSize);
// Get optimized code and frame that need to be deoptimized.
DartFrameIterator iterator(last_fp, thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame != NULL);
const Code& optimized_code = Code::Handle(caller_frame->LookupDartCode());
ASSERT(optimized_code.is_optimized());
const Function& top_function =
Function::Handle(thread->zone(), optimized_code.function());
const bool deoptimizing_code = top_function.HasOptimizedCode();
if (FLAG_trace_deoptimization) {
const Function& function = Function::Handle(optimized_code.function());
THR_Print("== Deoptimizing code for '%s', %s, %s\n",
function.ToFullyQualifiedCString(),
deoptimizing_code ? "code & frame" : "frame",
(is_lazy_deopt != 0u) ? "lazy-deopt" : "");
}
if (is_lazy_deopt != 0u) {
const uword deopt_pc =
thread->pending_deopts().FindPendingDeopt(caller_frame->fp());
// N.B.: Update frame before updating pending deopt table. The profiler
// may attempt a stack walk in between.
caller_frame->set_pc(deopt_pc);
ASSERT(caller_frame->pc() == deopt_pc);
ASSERT(optimized_code.ContainsInstructionAt(caller_frame->pc()));
thread->pending_deopts().ClearPendingDeoptsAtOrBelow(
caller_frame->fp(), PendingDeopts::kClearDueToDeopt);
} else {
if (FLAG_trace_deoptimization) {
THR_Print("Eager deopt fp=%" Pp " pc=%" Pp "\n", caller_frame->fp(),
caller_frame->pc());
}
}
// Copy the saved registers from the stack.
fpu_register_t* fpu_registers;
intptr_t* cpu_registers;
CopySavedRegisters(saved_registers_address, &fpu_registers, &cpu_registers);
// Create the DeoptContext.
DeoptContext* deopt_context = new DeoptContext(
caller_frame, optimized_code, DeoptContext::kDestIsOriginalFrame,
fpu_registers, cpu_registers, is_lazy_deopt != 0, deoptimizing_code);
isolate->set_deopt_context(deopt_context);
// Stack size (FP - SP) in bytes.
return deopt_context->DestStackAdjustment() * kWordSize;
#else
UNREACHABLE();
return 0;
#endif // !DART_PRECOMPILED_RUNTIME
}
END_LEAF_RUNTIME_ENTRY
// The stack has been adjusted to fit all values for unoptimized frame.
// Fill the unoptimized frame.
DEFINE_LEAF_RUNTIME_ENTRY(void, DeoptimizeFillFrame, 1, uword last_fp) {
#if !defined(DART_PRECOMPILED_RUNTIME)
Thread* thread = Thread::Current();
Isolate* isolate = thread->isolate();
StackZone zone(thread);
DeoptContext* deopt_context = isolate->deopt_context();
DartFrameIterator iterator(last_fp, thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame != NULL);
#if defined(DEBUG)
{
// The code from the deopt_context.
const Code& code = Code::Handle(deopt_context->code());
// The code from our frame.
const Code& optimized_code = Code::Handle(caller_frame->LookupDartCode());
const Function& function = Function::Handle(optimized_code.function());
ASSERT(!function.IsNull());
// The code will be the same as before.
ASSERT(code.ptr() == optimized_code.ptr());
// Some sanity checking of the optimized code.
ASSERT(!optimized_code.IsNull() && optimized_code.is_optimized());
}
#endif
deopt_context->set_dest_frame(caller_frame);
deopt_context->FillDestFrame();
#else
UNREACHABLE();
#endif // !DART_PRECOMPILED_RUNTIME
}
END_LEAF_RUNTIME_ENTRY
// This is the last step in the deoptimization, GC can occur.
// Returns number of bytes to remove from the expression stack of the
// bottom-most deoptimized frame. Those arguments were artificially injected
// under return address to keep them discoverable by GC that can occur during
// materialization phase.
DEFINE_RUNTIME_ENTRY(DeoptimizeMaterialize, 0) {
#if !defined(DART_PRECOMPILED_RUNTIME)
#if defined(DEBUG)
{
// We may rendezvous for a safepoint at entry or GC from the allocations
// below. Check the stack is walkable.
ValidateFrames();
}
#endif
DeoptContext* deopt_context = isolate->deopt_context();
intptr_t deopt_arg_count = deopt_context->MaterializeDeferredObjects();
isolate->set_deopt_context(NULL);
delete deopt_context;
// Return value tells deoptimization stub to remove the given number of bytes
// from the stack.
arguments.SetReturn(Smi::Handle(Smi::New(deopt_arg_count * kWordSize)));
#else
UNREACHABLE();
#endif // !DART_PRECOMPILED_RUNTIME
}
DEFINE_RUNTIME_ENTRY(RewindPostDeopt, 0) {
#if !defined(DART_PRECOMPILED_RUNTIME)
#if !defined(PRODUCT)
isolate->debugger()->RewindPostDeopt();
#endif // !PRODUCT
#endif // !DART_PRECOMPILED_RUNTIME
UNREACHABLE();
}
void OnEveryRuntimeEntryCall(Thread* thread,
const char* runtime_call_name,
bool can_lazy_deopt) {
ASSERT(FLAG_deoptimize_on_runtime_call_every > 0);
if (FLAG_precompiled_mode) {
return;
}
if (IsolateGroup::IsSystemIsolateGroup(thread->isolate_group())) {
return;
}
const bool is_deopt_related = strstr(runtime_call_name, "Deoptimize") != 0;
if (is_deopt_related) {
return;
}
// For --deoptimize-on-every-runtime-call we only consider runtime calls that
// can lazy-deopt.
if (can_lazy_deopt) {
if (FLAG_deoptimize_on_runtime_call_name_filter != nullptr &&
(strlen(runtime_call_name) !=
strlen(FLAG_deoptimize_on_runtime_call_name_filter) ||
strstr(runtime_call_name,
FLAG_deoptimize_on_runtime_call_name_filter) == 0)) {
return;
}
const uint32_t count = thread->IncrementAndGetRuntimeCallCount();
if ((count % FLAG_deoptimize_on_runtime_call_every) == 0) {
DeoptimizeLastDartFrameIfOptimized();
}
}
}
double DartModulo(double left, double right) {
double remainder = fmod_ieee(left, right);
if (remainder == 0.0) {
// We explicitly switch to the positive 0.0 (just in case it was negative).
remainder = +0.0;
} else if (remainder < 0.0) {
if (right < 0) {
remainder -= right;
} else {
remainder += right;
}
}
return remainder;
}
// Update global type feedback recorded for a field recording the assignment
// of the given value.
// Arg0: Field object;
// Arg1: Value that is being stored.
DEFINE_RUNTIME_ENTRY(UpdateFieldCid, 2) {
#if !defined(DART_PRECOMPILED_RUNTIME)
const Field& field = Field::CheckedHandle(zone, arguments.ArgAt(0));
const Object& value = Object::Handle(arguments.ArgAt(1));
field.RecordStore(value);
#else
UNREACHABLE();
#endif
}
DEFINE_RUNTIME_ENTRY(InitInstanceField, 2) {
const Instance& instance = Instance::CheckedHandle(zone, arguments.ArgAt(0));
const Field& field = Field::CheckedHandle(zone, arguments.ArgAt(1));
Object& result = Object::Handle(zone, field.InitializeInstance(instance));
ThrowIfError(result);
result = instance.GetField(field);
ASSERT((result.ptr() != Object::sentinel().ptr()) &&
(result.ptr() != Object::transition_sentinel().ptr()));
arguments.SetReturn(result);
}
DEFINE_RUNTIME_ENTRY(InitStaticField, 1) {
const Field& field = Field::CheckedHandle(zone, arguments.ArgAt(0));
Object& result = Object::Handle(zone, field.InitializeStatic());
ThrowIfError(result);
result = field.StaticValue();
ASSERT((result.ptr() != Object::sentinel().ptr()) &&
(result.ptr() != Object::transition_sentinel().ptr()));
arguments.SetReturn(result);
}
DEFINE_RUNTIME_ENTRY(LateFieldAssignedDuringInitializationError, 1) {
const Field& field = Field::CheckedHandle(zone, arguments.ArgAt(0));
Exceptions::ThrowLateFieldAssignedDuringInitialization(
String::Handle(field.name()));
}
DEFINE_RUNTIME_ENTRY(LateFieldNotInitializedError, 1) {
const Field& field = Field::CheckedHandle(zone, arguments.ArgAt(0));
Exceptions::ThrowLateFieldNotInitialized(String::Handle(field.name()));
}
DEFINE_RUNTIME_ENTRY(NotLoaded, 0) {
// We could just use a trap instruction in the stub, but we get better stack
// traces when there is an exit frame.
FATAL("Not loaded");
}
// Use expected function signatures to help MSVC compiler resolve overloading.
typedef double (*UnaryMathCFunction)(double x);
typedef double (*BinaryMathCFunction)(double x, double y);
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
LibcPow,
2,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(static_cast<BinaryMathCFunction>(&pow)));
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
DartModulo,
2,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(
static_cast<BinaryMathCFunction>(&DartModulo)));
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
LibcAtan2,
2,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(
static_cast<BinaryMathCFunction>(&atan2_ieee)));
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
LibcFloor,
1,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(static_cast<UnaryMathCFunction>(&floor)));
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
LibcCeil,
1,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(static_cast<UnaryMathCFunction>(&ceil)));
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
LibcTrunc,
1,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(static_cast<UnaryMathCFunction>(&trunc)));
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
LibcRound,
1,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(static_cast<UnaryMathCFunction>(&round)));
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
LibcCos,
1,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(static_cast<UnaryMathCFunction>(&cos)));
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
LibcSin,
1,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(static_cast<UnaryMathCFunction>(&sin)));
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
LibcAsin,
1,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(static_cast<UnaryMathCFunction>(&asin)));
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
LibcAcos,
1,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(static_cast<UnaryMathCFunction>(&acos)));
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
LibcTan,
1,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(static_cast<UnaryMathCFunction>(&tan)));
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
LibcAtan,
1,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(static_cast<UnaryMathCFunction>(&atan)));
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
LibcExp,
1,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(static_cast<UnaryMathCFunction>(&exp)));
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
LibcLog,
1,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(static_cast<UnaryMathCFunction>(&log)));
extern "C" void DFLRT_EnterSafepoint(NativeArguments __unusable_) {
CHECK_STACK_ALIGNMENT;
TRACE_RUNTIME_CALL("%s", "EnterSafepoint");
Thread* thread = Thread::Current();
ASSERT(thread->top_exit_frame_info() != 0);
ASSERT(thread->execution_state() == Thread::kThreadInNative);
thread->EnterSafepoint();
TRACE_RUNTIME_CALL("%s", "EnterSafepoint done");
}
DEFINE_RAW_LEAF_RUNTIME_ENTRY(EnterSafepoint, 0, false, &DFLRT_EnterSafepoint);
extern "C" void DFLRT_ExitSafepoint(NativeArguments __unusable_) {
CHECK_STACK_ALIGNMENT;
TRACE_RUNTIME_CALL("%s", "ExitSafepoint");
Thread* thread = Thread::Current();
ASSERT(thread->top_exit_frame_info() != 0);
ASSERT(thread->execution_state() == Thread::kThreadInVM);
if (thread->is_unwind_in_progress()) {
// Clean up safepoint unwind error marker to prevent safepoint tripping.
// The safepoint marker will get restored just before jumping back
// to generated code.
thread->SetUnwindErrorInProgress(false);
NoSafepointScope no_safepoint;
Error unwind_error;
unwind_error ^=
thread->isolate()->isolate_object_store()->preallocated_unwind_error();
Exceptions::PropagateError(unwind_error);
}
thread->ExitSafepoint();
TRACE_RUNTIME_CALL("%s", "ExitSafepoint done");
}
DEFINE_RAW_LEAF_RUNTIME_ENTRY(ExitSafepoint, 0, false, &DFLRT_ExitSafepoint);
// This is expected to be invoked when jumping to destination frame,
// during exception handling.
extern "C" void DFLRT_ExitSafepointIgnoreUnwindInProgress(
NativeArguments __unusable_) {
CHECK_STACK_ALIGNMENT;
TRACE_RUNTIME_CALL("%s", "ExitSafepointIgnoreUnwindInProgress");
Thread* thread = Thread::Current();
ASSERT(thread->top_exit_frame_info() != 0);
ASSERT(thread->execution_state() == Thread::kThreadInVM);
// Compared to ExitSafepoint above we are going to ignore
// is_unwind_in_progress flag because this is called as part of JumpToFrame
// exception handler - we want this transition to complete so that the next
// safepoint check does error propagation.
thread->ExitSafepoint();
TRACE_RUNTIME_CALL("%s", "ExitSafepointIgnoreUnwindInProgress done");
}
DEFINE_RAW_LEAF_RUNTIME_ENTRY(ExitSafepointIgnoreUnwindInProgress,
0,
false,
&DFLRT_ExitSafepointIgnoreUnwindInProgress);
// Not registered as a runtime entry because we can't use Thread to look it up.
static Thread* GetThreadForNativeCallback(uword callback_id,
uword return_address) {
Thread* const thread = Thread::Current();
if (thread == nullptr) {
FATAL("Cannot invoke native callback outside an isolate.");
}
if (thread->no_callback_scope_depth() != 0) {
FATAL("Cannot invoke native callback when API callbacks are prohibited.");
}
if (thread->is_unwind_in_progress()) {
FATAL("Cannot invoke native callback while unwind error propagates.");
}
if (!thread->IsMutatorThread()) {
FATAL("Native callbacks must be invoked on the mutator thread.");
}
// Set the execution state to VM while waiting for the safepoint to end.
// This isn't strictly necessary but enables tests to check that we're not
// in native code anymore. See tests/ffi/function_gc_test.dart for example.
thread->set_execution_state(Thread::kThreadInVM);
thread->ExitSafepoint();
thread->VerifyCallbackIsolate(callback_id, return_address);
return thread;
}
#if defined(DART_HOST_OS_WINDOWS)
#pragma intrinsic(_ReturnAddress)
#endif
// This is called directly by NativeEntryInstr. At the moment we enter this
// routine, the caller is generated code in the Isolate heap. Therefore we check
// that the return address (caller) corresponds to the declared callback ID's
// code within this Isolate.
extern "C" Thread* DLRT_GetThreadForNativeCallback(uword callback_id) {
CHECK_STACK_ALIGNMENT;
TRACE_RUNTIME_CALL("GetThreadForNativeCallback %" Pd, callback_id);
#if defined(DART_HOST_OS_WINDOWS)
void* return_address = _ReturnAddress();
#else
void* return_address = __builtin_return_address(0);
#endif
Thread* return_value = GetThreadForNativeCallback(
callback_id, reinterpret_cast<uword>(return_address));
TRACE_RUNTIME_CALL("GetThreadForNativeCallback returning %p", return_value);
return return_value;
}
// This is called by a native callback trampoline
// (see StubCodeCompiler::GenerateJITCallbackTrampolines). There is no need to
// check the return address because the trampoline will use the callback ID to
// look up the generated code. We still check that the callback ID is valid for
// this isolate.
extern "C" Thread* DLRT_GetThreadForNativeCallbackTrampoline(
uword callback_id) {
CHECK_STACK_ALIGNMENT;
return GetThreadForNativeCallback(callback_id, 0);
}
// This is called directly by EnterHandleScopeInstr.
extern "C" ApiLocalScope* DLRT_EnterHandleScope(Thread* thread) {
CHECK_STACK_ALIGNMENT;
TRACE_RUNTIME_CALL("EnterHandleScope %p", thread);
thread->EnterApiScope();
ApiLocalScope* return_value = thread->api_top_scope();
TRACE_RUNTIME_CALL("EnterHandleScope returning %p", return_value);
return return_value;
}
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
EnterHandleScope,
1,
false /* is_float */,
reinterpret_cast<RuntimeFunction>(&DLRT_EnterHandleScope));
// This is called directly by ExitHandleScopeInstr.
extern "C" void DLRT_ExitHandleScope(Thread* thread) {
CHECK_STACK_ALIGNMENT;
TRACE_RUNTIME_CALL("ExitHandleScope %p", thread);
thread->ExitApiScope();
TRACE_RUNTIME_CALL("ExitHandleScope %s", "done");
}
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
ExitHandleScope,
1,
false /* is_float */,
reinterpret_cast<RuntimeFunction>(&DLRT_ExitHandleScope));
// This is called directly by AllocateHandleInstr.
extern "C" LocalHandle* DLRT_AllocateHandle(ApiLocalScope* scope) {
CHECK_STACK_ALIGNMENT;
TRACE_RUNTIME_CALL("AllocateHandle %p", scope);
LocalHandle* return_value = scope->local_handles()->AllocateHandle();
// Don't return an uninitialised handle.
return_value->set_ptr(Object::sentinel().ptr());
TRACE_RUNTIME_CALL("AllocateHandle returning %p", return_value);
return return_value;
}
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
AllocateHandle,
1,
false /* is_float */,
reinterpret_cast<RuntimeFunction>(&DLRT_AllocateHandle));
#if defined(USING_THREAD_SANITIZER)
#define TSAN_ACQUIRE reinterpret_cast<RuntimeFunction>(&__tsan_acquire)
#define TSAN_RELEASE reinterpret_cast<RuntimeFunction>(&__tsan_release)
#else
#define TSAN_ACQUIRE nullptr
#define TSAN_RELEASE nullptr
#endif
DEFINE_RAW_LEAF_RUNTIME_ENTRY(TsanLoadAcquire,
/*argument_count=*/1,
/*is_float=*/false,
TSAN_ACQUIRE);
DEFINE_RAW_LEAF_RUNTIME_ENTRY(TsanStoreRelease,
/*argument_count=*/1,
/*is_float=*/false,
TSAN_RELEASE);
} // namespace dart