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sdk/runtime/vm/kernel.cc
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Alexander Markov c78f67cc7e [vm/aot] Use TFA to detect dynamic, non-this and tear-off uses 
TFA is improved to detect if a method was called using dynamic selector,
was ever called not via this, and whether the tear-off was taken.
This information is used to remove parameter type checks in AOT.

Less accurate selector-based analysis, which was used previously to get
this information, is now used only if TFA is disabled.

Also, precompiler is improved to omit method extractors and implicit
closure functions if analysis proved that tear-off is not taken.

Flutter gallery snapshot size: -0.8%

Change-Id: Iec01257dfdc78104752104df14e2ce078d326a96
Reviewed-on: https://dart-review.googlesource.com/77005
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Samir Jindel <sjindel@google.com>
2018-09-28 23:49:09 +00:00

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// Copyright (c) 2016, 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/kernel.h"
#include "vm/compiler/frontend/constant_evaluator.h"
#include "vm/compiler/frontend/kernel_translation_helper.h"
#include "vm/longjump.h"
#include "vm/object_store.h"
#include "vm/parser.h" // For Parser::kParameter* constants.
#if !defined(DART_PRECOMPILED_RUNTIME)
namespace dart {
namespace kernel {
bool FieldHasFunctionLiteralInitializer(const Field& field,
TokenPosition* start,
TokenPosition* end) {
Zone* zone = Thread::Current()->zone();
const Script& script = Script::Handle(zone, field.Script());
TranslationHelper translation_helper(Thread::Current());
translation_helper.InitFromScript(script);
KernelReaderHelper kernel_reader_helper(
zone, &translation_helper, Script::Handle(zone, field.Script()),
ExternalTypedData::Handle(zone, field.KernelData()),
field.KernelDataProgramOffset());
kernel_reader_helper.SetOffset(field.kernel_offset());
kernel::FieldHelper field_helper(&kernel_reader_helper);
field_helper.ReadUntilExcluding(kernel::FieldHelper::kEnd, true);
return field_helper.FieldHasFunctionLiteralInitializer(start, end);
}
KernelLineStartsReader::KernelLineStartsReader(
const dart::TypedData& line_starts_data,
dart::Zone* zone)
: line_starts_data_(line_starts_data) {
TypedDataElementType type = line_starts_data_.ElementType();
if (type == kInt8ArrayElement) {
helper_ = new KernelInt8LineStartsHelper();
} else if (type == kInt16ArrayElement) {
helper_ = new KernelInt16LineStartsHelper();
} else if (type == kInt32ArrayElement) {
helper_ = new KernelInt32LineStartsHelper();
} else {
UNREACHABLE();
}
}
intptr_t KernelLineStartsReader::LineNumberForPosition(
intptr_t position) const {
intptr_t line_count = line_starts_data_.Length();
intptr_t current_start = 0;
for (intptr_t i = 0; i < line_count; ++i) {
current_start += helper_->At(line_starts_data_, i);
if (current_start > position) {
// If current_start is greater than the desired position, it means that
// it is for the line after |position|. However, since line numbers
// start at 1, we just return |i|.
return i;
}
if (current_start == position) {
return i + 1;
}
}
return line_count;
}
void KernelLineStartsReader::LocationForPosition(intptr_t position,
intptr_t* line,
intptr_t* col) const {
intptr_t line_count = line_starts_data_.Length();
intptr_t current_start = 0;
intptr_t previous_start = 0;
for (intptr_t i = 0; i < line_count; ++i) {
current_start += helper_->At(line_starts_data_, i);
if (current_start > position) {
*line = i;
if (col != NULL) {
*col = position - previous_start + 1;
}
return;
}
if (current_start == position) {
*line = i + 1;
if (col != NULL) {
*col = 1;
}
return;
}
previous_start = current_start;
}
// If the start of any of the lines did not cross |position|,
// then it means the position falls on the last line.
*line = line_count;
if (col != NULL) {
*col = position - current_start + 1;
}
}
void KernelLineStartsReader::TokenRangeAtLine(
intptr_t source_length,
intptr_t line_number,
TokenPosition* first_token_index,
TokenPosition* last_token_index) const {
ASSERT(line_number <= line_starts_data_.Length());
intptr_t cumulative = 0;
for (intptr_t i = 0; i < line_number; ++i) {
cumulative += helper_->At(line_starts_data_, i);
}
*first_token_index = dart::TokenPosition(cumulative);
if (line_number == line_starts_data_.Length()) {
*last_token_index = dart::TokenPosition(source_length);
} else {
*last_token_index = dart::TokenPosition(
cumulative + helper_->At(line_starts_data_, line_number) - 1);
}
}
int32_t KernelLineStartsReader::KernelInt8LineStartsHelper::At(
const dart::TypedData& data,
intptr_t index) const {
return data.GetInt8(index);
}
int32_t KernelLineStartsReader::KernelInt16LineStartsHelper::At(
const dart::TypedData& data,
intptr_t index) const {
return data.GetInt16(index << 1);
}
int32_t KernelLineStartsReader::KernelInt32LineStartsHelper::At(
const dart::TypedData& data,
intptr_t index) const {
return data.GetInt32(index << 2);
}
class KernelTokenPositionCollector : public KernelReaderHelper {
public:
KernelTokenPositionCollector(
Zone* zone,
TranslationHelper* translation_helper,
const Script& script,
const ExternalTypedData& data,
intptr_t data_program_offset,
intptr_t initial_script_index,
intptr_t record_for_script_id,
GrowableArray<intptr_t>* record_token_positions_into,
GrowableArray<intptr_t>* record_yield_positions_into)
: KernelReaderHelper(zone,
translation_helper,
script,
data,
data_program_offset),
current_script_id_(initial_script_index),
record_for_script_id_(record_for_script_id),
record_token_positions_into_(record_token_positions_into),
record_yield_positions_into_(record_yield_positions_into) {}
void CollectTokenPositions(intptr_t kernel_offset);
void RecordTokenPosition(TokenPosition position) override;
void RecordYieldPosition(TokenPosition position) override;
void set_current_script_id(intptr_t id) override { current_script_id_ = id; }
private:
intptr_t current_script_id_;
intptr_t record_for_script_id_;
GrowableArray<intptr_t>* record_token_positions_into_;
GrowableArray<intptr_t>* record_yield_positions_into_;
DISALLOW_COPY_AND_ASSIGN(KernelTokenPositionCollector);
};
void KernelTokenPositionCollector::CollectTokenPositions(
intptr_t kernel_offset) {
SetOffset(kernel_offset);
const Tag tag = PeekTag();
if (tag == kProcedure) {
ProcedureHelper procedure_helper(this);
procedure_helper.ReadUntilExcluding(ProcedureHelper::kEnd);
} else if (tag == kConstructor) {
ConstructorHelper constructor_helper(this);
constructor_helper.ReadUntilExcluding(ConstructorHelper::kEnd);
} else if (tag == kFunctionNode) {
FunctionNodeHelper function_node_helper(this);
function_node_helper.ReadUntilExcluding(FunctionNodeHelper::kEnd);
} else if (tag == kField) {
FieldHelper field_helper(this);
field_helper.ReadUntilExcluding(FieldHelper::kEnd);
} else if (tag == kClass) {
ClassHelper class_helper(this);
class_helper.ReadUntilExcluding(ClassHelper::kEnd);
} else {
ReportUnexpectedTag("a class or a member", tag);
UNREACHABLE();
}
}
void KernelTokenPositionCollector::RecordTokenPosition(TokenPosition position) {
if (record_for_script_id_ == current_script_id_ &&
record_token_positions_into_ != NULL && position.IsReal()) {
record_token_positions_into_->Add(position.value());
}
}
void KernelTokenPositionCollector::RecordYieldPosition(TokenPosition position) {
if (record_for_script_id_ == current_script_id_ &&
record_yield_positions_into_ != NULL && position.IsReal()) {
record_yield_positions_into_->Add(position.value());
}
}
static int LowestFirst(const intptr_t* a, const intptr_t* b) {
return *a - *b;
}
/**
* If index exists as sublist in list, sort the sublist from lowest to highest,
* then copy it, as Smis and without duplicates,
* to a new Array in Heap::kOld which is returned.
* Note that the source list is both sorted and de-duplicated as well, but will
* possibly contain duplicate and unsorted data at the end.
* Otherwise (when sublist doesn't exist in list) return new empty array.
*/
static RawArray* AsSortedDuplicateFreeArray(GrowableArray<intptr_t>* source) {
intptr_t size = source->length();
if (size == 0) {
return Object::empty_array().raw();
}
source->Sort(LowestFirst);
intptr_t last = 0;
for (intptr_t current = 1; current < size; ++current) {
if (source->At(last) != source->At(current)) {
(*source)[++last] = source->At(current);
}
}
Array& array_object = Array::Handle();
array_object = Array::New(last + 1, Heap::kOld);
Smi& smi_value = Smi::Handle();
for (intptr_t i = 0; i <= last; ++i) {
smi_value = Smi::New(source->At(i));
array_object.SetAt(i, smi_value);
}
return array_object.raw();
}
static void ProcessTokenPositionsEntry(
const ExternalTypedData& kernel_data,
const Script& script,
const Script& entry_script,
intptr_t kernel_offset,
intptr_t data_kernel_offset,
Zone* zone,
TranslationHelper* helper,
GrowableArray<intptr_t>* token_positions,
GrowableArray<intptr_t>* yield_positions) {
if (kernel_data.IsNull()) {
return;
}
KernelTokenPositionCollector token_position_collector(
zone, helper, script, kernel_data, data_kernel_offset,
entry_script.kernel_script_index(), script.kernel_script_index(),
token_positions, yield_positions);
token_position_collector.CollectTokenPositions(kernel_offset);
}
void CollectTokenPositionsFor(const Script& interesting_script) {
Thread* thread = Thread::Current();
Zone* zone = thread->zone();
TranslationHelper helper(thread);
helper.InitFromScript(interesting_script);
GrowableArray<intptr_t> token_positions(10);
GrowableArray<intptr_t> yield_positions(1);
Isolate* isolate = thread->isolate();
const GrowableObjectArray& libs =
GrowableObjectArray::Handle(zone, isolate->object_store()->libraries());
Library& lib = Library::Handle(zone);
Object& entry = Object::Handle(zone);
Script& entry_script = Script::Handle(zone);
ExternalTypedData& data = ExternalTypedData::Handle(zone);
auto& temp_array = Array::Handle(zone);
auto& temp_field = Field::Handle(zone);
auto& temp_function = Function::Handle(zone);
for (intptr_t i = 0; i < libs.Length(); i++) {
lib ^= libs.At(i);
DictionaryIterator it(lib);
while (it.HasNext()) {
entry = it.GetNext();
data = ExternalTypedData::null();
if (entry.IsClass()) {
const Class& klass = Class::Cast(entry);
if (klass.script() == interesting_script.raw()) {
token_positions.Add(klass.token_pos().value());
}
if (klass.is_finalized()) {
temp_array = klass.fields();
for (intptr_t i = 0; i < temp_array.Length(); ++i) {
temp_field ^= temp_array.At(i);
if (temp_field.kernel_offset() <= 0) {
// Skip artificially injected fields.
continue;
}
entry_script = temp_field.Script();
if (entry_script.raw() != interesting_script.raw()) {
continue;
}
data = temp_field.KernelData();
ProcessTokenPositionsEntry(data, interesting_script, entry_script,
temp_field.kernel_offset(),
temp_field.KernelDataProgramOffset(),
zone, &helper, &token_positions,
&yield_positions);
}
temp_array = klass.functions();
for (intptr_t i = 0; i < temp_array.Length(); ++i) {
temp_function ^= temp_array.At(i);
entry_script = temp_function.script();
if (entry_script.raw() != interesting_script.raw()) {
continue;
}
data = temp_function.KernelData();
ProcessTokenPositionsEntry(data, interesting_script, entry_script,
temp_function.kernel_offset(),
temp_function.KernelDataProgramOffset(),
zone, &helper, &token_positions,
&yield_positions);
}
} else {
// Class isn't finalized yet: read the data attached to it.
ASSERT(klass.kernel_offset() > 0);
data = lib.kernel_data();
ASSERT(!data.IsNull());
const intptr_t library_kernel_offset = lib.kernel_offset();
ASSERT(library_kernel_offset > 0);
const intptr_t class_offset = klass.kernel_offset();
entry_script = klass.script();
if (entry_script.raw() != interesting_script.raw()) {
continue;
}
ProcessTokenPositionsEntry(data, interesting_script, entry_script,
class_offset, library_kernel_offset, zone,
&helper, &token_positions,
&yield_positions);
}
} else if (entry.IsFunction()) {
temp_function ^= entry.raw();
entry_script = temp_function.script();
if (entry_script.raw() != interesting_script.raw()) {
continue;
}
data = temp_function.KernelData();
ProcessTokenPositionsEntry(data, interesting_script, entry_script,
temp_function.kernel_offset(),
temp_function.KernelDataProgramOffset(),
zone, &helper, &token_positions,
&yield_positions);
} else if (entry.IsField()) {
const Field& field = Field::Cast(entry);
if (field.kernel_offset() <= 0) {
// Skip artificially injected fields.
continue;
}
entry_script = field.Script();
if (entry_script.raw() != interesting_script.raw()) {
continue;
}
data = field.KernelData();
ProcessTokenPositionsEntry(data, interesting_script, entry_script,
field.kernel_offset(),
field.KernelDataProgramOffset(), zone,
&helper, &token_positions, &yield_positions);
}
}
}
Script& script = Script::Handle(zone, interesting_script.raw());
Array& array_object = Array::Handle(zone);
array_object = AsSortedDuplicateFreeArray(&token_positions);
script.set_debug_positions(array_object);
array_object = AsSortedDuplicateFreeArray(&yield_positions);
script.set_yield_positions(array_object);
}
class MetadataEvaluator : public KernelReaderHelper {
public:
MetadataEvaluator(Zone* zone,
TranslationHelper* translation_helper,
const Script& script,
const ExternalTypedData& data,
intptr_t data_program_offset,
ActiveClass* active_class)
: KernelReaderHelper(zone,
translation_helper,
script,
data,
data_program_offset),
type_translator_(this, active_class, /* finalize= */ true),
constant_evaluator_(this, &type_translator_, active_class, nullptr) {}
RawObject* EvaluateMetadata(intptr_t kernel_offset,
bool is_annotations_offset) {
SetOffset(kernel_offset);
// Library and LibraryDependency objects do not have a tag in kernel binary.
// Synthetic metadata fields corresponding to these objects keep kernel
// offset of annotations list instead of annotated object.
if (!is_annotations_offset) {
const Tag tag = PeekTag();
if (tag == kClass) {
ClassHelper class_helper(this);
class_helper.ReadUntilExcluding(ClassHelper::kAnnotations);
} else if (tag == kProcedure) {
ProcedureHelper procedure_helper(this);
procedure_helper.ReadUntilExcluding(ProcedureHelper::kAnnotations);
} else if (tag == kField) {
FieldHelper field_helper(this);
field_helper.ReadUntilExcluding(FieldHelper::kAnnotations);
} else if (tag == kConstructor) {
ConstructorHelper constructor_helper(this);
constructor_helper.ReadUntilExcluding(ConstructorHelper::kAnnotations);
} else {
FATAL("No support for metadata on this type of kernel node\n");
}
}
return constant_evaluator_.EvaluateAnnotations();
}
private:
TypeTranslator type_translator_;
ConstantEvaluator constant_evaluator_;
DISALLOW_COPY_AND_ASSIGN(MetadataEvaluator);
};
RawObject* EvaluateMetadata(const Field& metadata_field,
bool is_annotations_offset) {
LongJumpScope jump;
if (setjmp(*jump.Set()) == 0) {
Thread* thread = Thread::Current();
Zone* zone = thread->zone();
TranslationHelper helper(thread);
Script& script = Script::Handle(zone, metadata_field.Script());
helper.InitFromScript(script);
const Class& owner_class = Class::Handle(zone, metadata_field.Owner());
ActiveClass active_class;
ActiveClassScope active_class_scope(&active_class, &owner_class);
MetadataEvaluator metadata_evaluator(
zone, &helper, script,
ExternalTypedData::Handle(zone, metadata_field.KernelData()),
metadata_field.KernelDataProgramOffset(), &active_class);
return metadata_evaluator.EvaluateMetadata(metadata_field.kernel_offset(),
is_annotations_offset);
} else {
Thread* thread = Thread::Current();
Error& error = Error::Handle();
error = thread->sticky_error();
thread->clear_sticky_error();
return error.raw();
}
}
class ParameterDescriptorBuilder : public KernelReaderHelper {
public:
ParameterDescriptorBuilder(TranslationHelper* translation_helper,
const Script& script,
Zone* zone,
const ExternalTypedData& data,
intptr_t data_program_offset,
ActiveClass* active_class)
: KernelReaderHelper(zone,
translation_helper,
script,
data,
data_program_offset),
type_translator_(this, active_class, /* finalize= */ true),
constant_evaluator_(this, &type_translator_, active_class, nullptr) {}
RawObject* BuildParameterDescriptor(intptr_t kernel_offset);
private:
TypeTranslator type_translator_;
ConstantEvaluator constant_evaluator_;
DISALLOW_COPY_AND_ASSIGN(ParameterDescriptorBuilder);
};
RawObject* ParameterDescriptorBuilder::BuildParameterDescriptor(
intptr_t kernel_offset) {
SetOffset(kernel_offset);
ReadUntilFunctionNode();
FunctionNodeHelper function_node_helper(this);
function_node_helper.ReadUntilExcluding(
FunctionNodeHelper::kPositionalParameters);
intptr_t param_count = function_node_helper.total_parameter_count_;
intptr_t positional_count = ReadListLength(); // read list length.
intptr_t named_parameter_count = param_count - positional_count;
const Array& param_descriptor = Array::Handle(
Array::New(param_count * Parser::kParameterEntrySize, Heap::kOld));
for (intptr_t i = 0; i < param_count; ++i) {
const intptr_t entry_start = i * Parser::kParameterEntrySize;
if (i == positional_count) {
intptr_t named_parameter_count_check =
ReadListLength(); // read list length.
ASSERT(named_parameter_count_check == named_parameter_count);
}
// Read ith variable declaration.
intptr_t param_kernel_offset = reader_.offset();
VariableDeclarationHelper helper(this);
helper.ReadUntilExcluding(VariableDeclarationHelper::kInitializer);
param_descriptor.SetAt(entry_start + Parser::kParameterIsFinalOffset,
helper.IsFinal() ? Bool::True() : Bool::False());
Tag tag = ReadTag(); // read (first part of) initializer.
if (tag == kSomething) {
// this will (potentially) read the initializer, but reset the position.
Instance& constant = Instance::ZoneHandle(
zone_, constant_evaluator_.EvaluateExpression(ReaderOffset()));
SkipExpression(); // read (actual) initializer.
param_descriptor.SetAt(entry_start + Parser::kParameterDefaultValueOffset,
constant);
} else {
param_descriptor.SetAt(entry_start + Parser::kParameterDefaultValueOffset,
Object::null_instance());
}
if (FLAG_enable_mirrors && (helper.annotation_count_ > 0)) {
AlternativeReadingScope alt(&reader_, param_kernel_offset);
VariableDeclarationHelper helper(this);
helper.ReadUntilExcluding(VariableDeclarationHelper::kAnnotations);
Object& metadata =
Object::ZoneHandle(zone_, constant_evaluator_.EvaluateAnnotations());
param_descriptor.SetAt(entry_start + Parser::kParameterMetadataOffset,
metadata);
} else {
param_descriptor.SetAt(entry_start + Parser::kParameterMetadataOffset,
Object::null_instance());
}
}
return param_descriptor.raw();
}
RawObject* BuildParameterDescriptor(const Function& function) {
LongJumpScope jump;
if (setjmp(*jump.Set()) == 0) {
Thread* thread = Thread::Current();
Zone* zone = thread->zone();
TranslationHelper helper(thread);
Script& script = Script::Handle(zone, function.script());
helper.InitFromScript(script);
const Class& owner_class = Class::Handle(zone, function.Owner());
ActiveClass active_class;
ActiveClassScope active_class_scope(&active_class, &owner_class);
ParameterDescriptorBuilder builder(
&helper, Script::Handle(zone, function.script()), zone,
ExternalTypedData::Handle(zone, function.KernelData()),
function.KernelDataProgramOffset(), &active_class);
return builder.BuildParameterDescriptor(function.kernel_offset());
} else {
Thread* thread = Thread::Current();
Error& error = Error::Handle();
error = thread->sticky_error();
thread->clear_sticky_error();
return error.raw();
}
}
bool NeedsDynamicInvocationForwarder(const Function& function) {
ASSERT(FLAG_strong);
Thread* thread = Thread::Current();
Zone* zone = thread->zone();
TranslationHelper helper(thread);
Script& script = Script::Handle(zone, function.script());
helper.InitFromScript(script);
// Setup a [ActiveClassScope] and a [ActiveMemberScope] which will be used
// e.g. for type translation.
const Class& owner_class = Class::Handle(zone, function.Owner());
Function& outermost_function =
Function::Handle(zone, function.GetOutermostFunction());
ActiveClass active_class;
ActiveClassScope active_class_scope(&active_class, &owner_class);
ActiveMemberScope active_member(&active_class, &outermost_function);
ActiveTypeParametersScope active_type_params(&active_class, function, zone);
KernelReaderHelper reader_helper(
zone, &helper, script,
ExternalTypedData::Handle(zone, function.KernelData()),
function.KernelDataProgramOffset());
TypeTranslator type_translator(&reader_helper, &active_class,
/* finalize= */ true);
reader_helper.SetOffset(function.kernel_offset());
// Handle setters.
if (reader_helper.PeekTag() == kField) {
ASSERT(function.IsImplicitSetterFunction());
FieldHelper field_helper(&reader_helper);
field_helper.ReadUntilIncluding(FieldHelper::kFlags);
return !(field_helper.IsCovariant() ||
field_helper.IsGenericCovariantImpl());
}
reader_helper.ReadUntilFunctionNode();
FunctionNodeHelper function_node_helper(&reader_helper);
function_node_helper.ReadUntilExcluding(FunctionNodeHelper::kTypeParameters);
intptr_t num_type_params = reader_helper.ReadListLength();
for (intptr_t i = 0; i < num_type_params; ++i) {
TypeParameterHelper helper(&reader_helper);
helper.ReadUntilExcludingAndSetJustRead(TypeParameterHelper::kBound);
AbstractType& bound = type_translator.BuildType(); // read bound
helper.Finish();
if (!bound.IsTopType() && !helper.IsGenericCovariantImpl()) {
return true;
}
}
function_node_helper.SetJustRead(FunctionNodeHelper::kTypeParameters);
function_node_helper.ReadUntilExcluding(
FunctionNodeHelper::kPositionalParameters);
// Positional.
const intptr_t num_positional_params = reader_helper.ReadListLength();
for (intptr_t i = 0; i < num_positional_params; ++i) {
VariableDeclarationHelper helper(&reader_helper);
helper.ReadUntilExcluding(VariableDeclarationHelper::kType);
AbstractType& type = type_translator.BuildType(); // read type.
helper.SetJustRead(VariableDeclarationHelper::kType);
helper.ReadUntilExcluding(VariableDeclarationHelper::kEnd);
if (!type.IsTopType() && !helper.IsGenericCovariantImpl() &&
!helper.IsCovariant()) {
return true;
}
}
// Named.
const intptr_t num_named_params = reader_helper.ReadListLength();
for (intptr_t i = 0; i < num_named_params; ++i) {
VariableDeclarationHelper helper(&reader_helper);
helper.ReadUntilExcluding(VariableDeclarationHelper::kType);
AbstractType& type = type_translator.BuildType(); // read type.
helper.SetJustRead(VariableDeclarationHelper::kType);
helper.ReadUntilExcluding(VariableDeclarationHelper::kEnd);
if (!type.IsTopType() && !helper.IsGenericCovariantImpl() &&
!helper.IsCovariant()) {
return true;
}
}
return false;
}
bool IsFieldInitializer(const Function& function, Zone* zone) {
return (function.kind() == RawFunction::kImplicitStaticFinalGetter) &&
String::Handle(zone, function.name())
.StartsWith(Symbols::InitPrefix());
}
bool IsTearOffTaken(const Function& function, Zone* zone) {
const Script& script = Script::Handle(zone, function.script());
TranslationHelper translation_helper(Thread::Current());
translation_helper.InitFromScript(script);
KernelReaderHelper reader_helper(
zone, &translation_helper, script,
ExternalTypedData::Handle(zone, function.KernelData()),
function.KernelDataProgramOffset());
ProcedureAttributesMetadataHelper procedure_attributes_metadata_helper(
&reader_helper);
ProcedureAttributesMetadata attrs =
procedure_attributes_metadata_helper.GetProcedureAttributes(
function.kernel_offset());
return attrs.has_tearoff_uses;
}
} // namespace kernel
} // namespace dart
#endif // !defined(DART_PRECOMPILED_RUNTIME)
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