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sdk/runtime/vm/kernel.cc
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Régis Crelier 62325f95b4 [vm/bytecode] Collect more bytecode token positions for a given script. 
Refactor Kernel::CollectTokenPositionsFor, but do not try to factorize code for
fields and functions, as too many handles would need to be passed around.

Bytecode reading creates duplicate script objects requiring scripts to be
matched by their url rather than by their raw address when collecting token
positions in bytecode. However, url comparison is not yet used, because
collecting token positions in the duplicated script 'dart:core/map.dart'
(in default mode) causes crashes in kernel reading. Will revisit.

Fix service test valid_source locations_test.dart and make sure fields
are properly reloaded, except fields injected by fasta.
Remove unused argument 'record' of KernelReaderHelper::ReadPosition().
Handle bytecode stub frame in IsAsyncMachinery() tester in debugger.

Change-Id: Ifbddcaec00e0696f7de13c5cf1e74380b31d2419
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/112402
Commit-Queue: Régis Crelier <regis@google.com>
Reviewed-by: Alexander Markov <alexmarkov@google.com>
2019-08-08 23:21:12 +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/bit_vector.h"
#include "vm/compiler/frontend/bytecode_reader.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.
#include "vm/stack_frame.h"
#if !defined(DART_PRECOMPILED_RUNTIME)
namespace dart {
namespace kernel {
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 CollectKernelDataTokenPositions(
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);
}
static void CollectTokenPosition(TokenPosition position,
GrowableArray<intptr_t>* token_positions) {
if (position.IsReal()) {
token_positions->Add(position.value());
}
}
static void CollectBytecodeSourceTokenPositions(
const Bytecode& bytecode,
Zone* zone,
GrowableArray<intptr_t>* token_positions) {
BytecodeSourcePositionsIterator iter(zone, bytecode);
while (iter.MoveNext()) {
CollectTokenPosition(iter.TokenPos(), token_positions);
}
}
static void CollectBytecodeFunctionTokenPositions(
const Function& function,
GrowableArray<intptr_t>* token_positions) {
Thread* thread = Thread::Current();
Zone* zone = thread->zone();
ASSERT(function.is_declared_in_bytecode());
CollectTokenPosition(function.token_pos(), token_positions);
CollectTokenPosition(function.end_token_pos(), token_positions);
if (!function.HasBytecode()) {
const Object& result = Object::Handle(
zone, BytecodeReader::ReadFunctionBytecode(thread, function));
if (!result.IsNull()) {
Exceptions::PropagateError(Error::Cast(result));
}
}
Bytecode& bytecode = Bytecode::Handle(zone, function.bytecode());
if (bytecode.IsNull()) {
return;
}
if (bytecode.HasSourcePositions() && !function.IsLocalFunction()) {
CollectBytecodeSourceTokenPositions(bytecode, zone, token_positions);
// Find closure functions in the object pool.
const ObjectPool& pool = ObjectPool::Handle(zone, bytecode.object_pool());
Object& object = Object::Handle(zone);
Function& closure = Function::Handle(zone);
for (intptr_t i = 0; i < pool.Length(); i++) {
ObjectPool::EntryType entry_type = pool.TypeAt(i);
if (entry_type != ObjectPool::EntryType::kTaggedObject) {
continue;
}
object = pool.ObjectAt(i);
if (object.IsFunction()) {
closure ^= object.raw();
if (closure.kind() == RawFunction::kClosureFunction &&
closure.IsLocalFunction()) {
CollectTokenPosition(closure.token_pos(), token_positions);
CollectTokenPosition(closure.end_token_pos(), token_positions);
bytecode = closure.bytecode();
ASSERT(!bytecode.IsNull());
ASSERT(bytecode.function() != Function::null());
ASSERT(bytecode.HasSourcePositions());
CollectBytecodeSourceTokenPositions(bytecode, zone, token_positions);
}
}
}
}
}
void CollectTokenPositionsFor(const Script& interesting_script) {
ASSERT(interesting_script.url() != String::null());
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);
lib.EnsureTopLevelClassIsFinalized();
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());
token_positions.Add(klass.end_token_pos().value());
}
// If class is declared in bytecode, its members should be loaded
// (via class finalization) before their token positions could be
// collected.
if (klass.is_declared_in_bytecode() && !klass.is_finalized()) {
const Error& error =
Error::Handle(zone, klass.EnsureIsFinalized(thread));
if (!error.IsNull()) {
Exceptions::PropagateError(error);
}
}
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.is_declared_in_bytecode() &&
temp_field.kernel_offset() <= 0) {
// Skip artificially injected fields.
continue;
}
entry_script = temp_field.Script();
if (entry_script.raw() != interesting_script.raw()) {
continue;
}
if (temp_field.is_declared_in_bytecode()) {
if (temp_field.is_static() && temp_field.has_initializer()) {
temp_function = temp_field.EnsureInitializerFunction();
CollectBytecodeFunctionTokenPositions(temp_function,
&token_positions);
}
} else {
data = temp_field.KernelData();
CollectKernelDataTokenPositions(
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;
}
if (temp_function.is_declared_in_bytecode()) {
CollectBytecodeFunctionTokenPositions(temp_function,
&token_positions);
} else {
data = temp_function.KernelData();
CollectKernelDataTokenPositions(
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.is_declared_in_bytecode());
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;
}
CollectKernelDataTokenPositions(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;
}
if (temp_function.is_declared_in_bytecode()) {
CollectBytecodeFunctionTokenPositions(temp_function,
&token_positions);
} else {
data = temp_function.KernelData();
CollectKernelDataTokenPositions(
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.is_declared_in_bytecode() && field.kernel_offset() <= 0) {
// Skip artificially injected fields.
continue;
}
entry_script = field.Script();
if (entry_script.raw() != interesting_script.raw()) {
continue;
}
if (field.is_declared_in_bytecode()) {
if (field.is_static() && field.has_initializer()) {
temp_function = field.EnsureInitializerFunction();
CollectBytecodeFunctionTokenPositions(temp_function,
&token_positions);
}
} else {
data = field.KernelData();
CollectKernelDataTokenPositions(
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);
// Note that yield positions in members declared in bytecode are not collected
// here, but on demand in the debugger.
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 {
return Thread::Current()->StealStickyError();
}
}
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);
if (function.is_declared_in_bytecode()) {
BytecodeComponentData bytecode_component(
&Array::Handle(zone, helper.GetBytecodeComponent()));
ActiveClass active_class;
BytecodeReaderHelper bytecode_reader_helper(&helper, &active_class,
&bytecode_component);
return bytecode_reader_helper.BuildParameterDescriptor(function);
}
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 {
return Thread::Current()->StealStickyError();
}
}
void ReadParameterCovariance(const Function& function,
BitVector* is_covariant,
BitVector* is_generic_covariant_impl) {
Thread* thread = Thread::Current();
Zone* zone = thread->zone();
const intptr_t num_params = function.NumParameters();
ASSERT(is_covariant->length() == num_params);
ASSERT(is_generic_covariant_impl->length() == num_params);
const auto& script = Script::Handle(zone, function.script());
TranslationHelper translation_helper(thread);
translation_helper.InitFromScript(script);
if (function.is_declared_in_bytecode()) {
BytecodeReaderHelper bytecode_reader_helper(&translation_helper, nullptr,
nullptr);
bytecode_reader_helper.ReadParameterCovariance(function, is_covariant,
is_generic_covariant_impl);
return;
}
KernelReaderHelper reader_helper(
zone, &translation_helper, script,
ExternalTypedData::Handle(zone, function.KernelData()),
function.KernelDataProgramOffset());
reader_helper.SetOffset(function.kernel_offset());
reader_helper.ReadUntilFunctionNode();
FunctionNodeHelper function_node_helper(&reader_helper);
function_node_helper.ReadUntilExcluding(
FunctionNodeHelper::kPositionalParameters);
// Positional.
const intptr_t num_positional_params = reader_helper.ReadListLength();
intptr_t param_index = function.NumImplicitParameters();
for (intptr_t i = 0; i < num_positional_params; ++i, ++param_index) {
VariableDeclarationHelper helper(&reader_helper);
helper.ReadUntilExcluding(VariableDeclarationHelper::kEnd);
if (helper.IsCovariant()) {
is_covariant->Add(param_index);
}
if (helper.IsGenericCovariantImpl()) {
is_generic_covariant_impl->Add(param_index);
}
}
// Named.
const intptr_t num_named_params = reader_helper.ReadListLength();
for (intptr_t i = 0; i < num_named_params; ++i, ++param_index) {
VariableDeclarationHelper helper(&reader_helper);
helper.ReadUntilExcluding(VariableDeclarationHelper::kEnd);
if (helper.IsCovariant()) {
is_covariant->Add(param_index);
}
if (helper.IsGenericCovariantImpl()) {
is_generic_covariant_impl->Add(param_index);
}
}
}
bool NeedsDynamicInvocationForwarder(const Function& function) {
Zone* zone = Thread::Current()->zone();
// Covariant parameters (both explicitly covariant and generic-covariant-impl)
// are checked in the body of a function and therefore don't need checks in a
// dynamic invocation forwarder. So dynamic invocation forwarder is only
// needed if there are non-covariant parameters of non-top type.
ASSERT(!function.IsImplicitGetterFunction());
if (function.IsImplicitSetterFunction()) {
const auto& field = Field::Handle(zone, function.accessor_field());
return !(field.is_covariant() || field.is_generic_covariant_impl());
}
const auto& type_params =
TypeArguments::Handle(zone, function.type_parameters());
if (!type_params.IsNull()) {
auto& type_param = TypeParameter::Handle(zone);
auto& bound = AbstractType::Handle(zone);
for (intptr_t i = 0, n = type_params.Length(); i < n; ++i) {
type_param ^= type_params.TypeAt(i);
bound = type_param.bound();
if (!bound.IsTopType() && !type_param.IsGenericCovariantImpl()) {
return true;
}
}
}
const intptr_t num_params = function.NumParameters();
BitVector is_covariant(zone, num_params);
BitVector is_generic_covariant_impl(zone, num_params);
ReadParameterCovariance(function, &is_covariant, &is_generic_covariant_impl);
auto& type = AbstractType::Handle(zone);
for (intptr_t i = function.NumImplicitParameters(); i < num_params; ++i) {
type = function.ParameterTypeAt(i);
if (!type.IsTopType() && !is_generic_covariant_impl.Contains(i) &&
!is_covariant.Contains(i)) {
return true;
}
}
return false;
}
static ProcedureAttributesMetadata ProcedureAttributesOf(
Zone* zone,
const Script& script,
const ExternalTypedData& kernel_data,
intptr_t kernel_data_program_offset,
intptr_t kernel_offset) {
TranslationHelper translation_helper(Thread::Current());
translation_helper.InitFromScript(script);
KernelReaderHelper reader_helper(zone, &translation_helper, script,
kernel_data, kernel_data_program_offset);
ProcedureAttributesMetadataHelper procedure_attributes_metadata_helper(
&reader_helper);
ProcedureAttributesMetadata attrs =
procedure_attributes_metadata_helper.GetProcedureAttributes(
kernel_offset);
return attrs;
}
ProcedureAttributesMetadata ProcedureAttributesOf(const Function& function,
Zone* zone) {
const Script& script = Script::Handle(zone, function.script());
return ProcedureAttributesOf(
zone, script, ExternalTypedData::Handle(zone, function.KernelData()),
function.KernelDataProgramOffset(), function.kernel_offset());
}
ProcedureAttributesMetadata ProcedureAttributesOf(const Field& field,
Zone* zone) {
const Class& parent = Class::Handle(zone, field.Owner());
const Script& script = Script::Handle(zone, parent.script());
return ProcedureAttributesOf(
zone, script, ExternalTypedData::Handle(zone, field.KernelData()),
field.KernelDataProgramOffset(), field.kernel_offset());
}
} // namespace kernel
} // namespace dart
#endif // !defined(DART_PRECOMPILED_RUNTIME)
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