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sdk/runtime/vm/kernel.cc
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Aske Simon Christensen 76c6282de6 [vm/aot] Use a global dispatch table for instance calls in AOT. 
This is a Dart-tailored implementation of the "row-displacement
dispatch table" technique for closed-world instance calls:

All interface targets in the program are grouped into selectors such
that all targets that could potentially be called from the same call
site have the same selector (currently just grouped by name).

Each selector is assigned a selector offset such that offset + classid
is unique for all selector/classid combinations where the class
implements the selector.

At every instance call site that has an interface target (i.e. where
the static type of the receiver is not dynamic), the selector offset +
receiver classid is computed and used as index into a global table of
entry points.

If the receiver can be null (as determined by the front-end TFA and the
VM type propagation), a null check is inserted before the call.

An arguments descriptor is provided (only) for selectors that need it
(those which have type parameters or optional/named parameters).

The dispatch table calls don't need the monomorphic entry code, so for
functions that are only called via dispatch table calls (i.e. never
called dynamically), the monomorphic entry code is left out.


Some future improvements to the table dispatch implementation are
mentioned in https://github.com/dart-lang/sdk/issues/40188


The table dispatch flag is disabled by default in this commit. A
separate commit enables the flag.

Change-Id: Ic2911742b4a2c9a8d3bc7df60605454cbe4c0714
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/126648
Commit-Queue: Aske Simon Christensen <askesc@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
Reviewed-by: Alexander Markov <alexmarkov@google.com>
2020-02-03 11:04:15 +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_reader.h"
#include "vm/compiler/frontend/kernel_translation_helper.h"
#include "vm/compiler/jit/compiler.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)
: 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) {}
void CollectTokenPositions(intptr_t kernel_offset);
void RecordTokenPosition(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_;
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());
}
}
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) {
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);
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) {
Thread* thread = Thread::Current();
Zone* zone = thread->zone();
interesting_script.LookupSourceAndLineStarts(zone);
TranslationHelper helper(thread);
helper.InitFromScript(interesting_script);
GrowableArray<intptr_t> token_positions(10);
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()) {
token_positions.Add(temp_field.token_pos().value());
token_positions.Add(temp_field.end_token_pos().value());
if (temp_field.is_static() &&
temp_field.has_nontrivial_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);
}
}
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);
}
}
} 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);
}
} 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);
}
} 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()) {
token_positions.Add(field.token_pos().value());
token_positions.Add(field.end_token_pos().value());
if (field.is_static() && field.has_nontrivial_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);
}
}
}
}
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);
}
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),
constant_reader_(this, active_class) {}
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_reader_.ReadAnnotations();
}
private:
ConstantReader constant_reader_;
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),
constant_reader_(this, active_class) {}
RawObject* BuildParameterDescriptor(const Function& function);
private:
ConstantReader constant_reader_;
DISALLOW_COPY_AND_ASSIGN(ParameterDescriptorBuilder);
};
RawObject* ParameterDescriptorBuilder::BuildParameterDescriptor(
const Function& function) {
SetOffset(function.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) && !function.is_abstract()) {
// This will read the initializer.
Instance& constant = Instance::ZoneHandle(
zone_, constant_reader_.ReadConstantExpression());
param_descriptor.SetAt(entry_start + Parser::kParameterDefaultValueOffset,
constant);
} else {
if (tag == kSomething) {
SkipExpression(); // Skip initializer.
}
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_reader_.ReadAnnotations());
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);
} 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());
const NNBDMode nnbd_mode = function.nnbd_mode();
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(nnbd_mode) && !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(nnbd_mode) && !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;
}
static void BytecodeProcedureAttributesError(const Object& function_or_field,
const Object& value) {
FATAL3("Unexpected value of %s bytecode attribute on %s: %s",
Symbols::vm_procedure_attributes_metadata().ToCString(),
function_or_field.ToCString(), value.ToCString());
}
static ProcedureAttributesMetadata ProcedureAttributesFromBytecodeAttribute(
Zone* zone,
const Object& function_or_field) {
ProcedureAttributesMetadata attrs;
const Object& value = Object::Handle(
zone,
BytecodeReader::GetBytecodeAttribute(
function_or_field, Symbols::vm_procedure_attributes_metadata()));
if (!value.IsNull()) {
const intptr_t kBytecodeAttributeLength = 3;
int32_t elements[kBytecodeAttributeLength];
if (!value.IsArray()) {
BytecodeProcedureAttributesError(function_or_field, value);
}
const Array& array = Array::Cast(value);
if (array.Length() != kBytecodeAttributeLength) {
BytecodeProcedureAttributesError(function_or_field, value);
}
Object& element = Object::Handle(zone);
for (intptr_t i = 0; i < kBytecodeAttributeLength; i++) {
element = array.At(i);
if (!element.IsSmi()) {
BytecodeProcedureAttributesError(function_or_field, value);
}
elements[i] = Smi::Cast(element).Value();
}
attrs.InitializeFromFlags(elements[0]);
attrs.method_or_setter_selector_id = elements[1];
attrs.getter_selector_id = elements[2];
}
return attrs;
}
ProcedureAttributesMetadata ProcedureAttributesOf(const Function& function,
Zone* zone) {
if (function.is_declared_in_bytecode()) {
if (function.IsImplicitGetterOrSetter()) {
const Field& field = Field::Handle(zone, function.accessor_field());
return ProcedureAttributesFromBytecodeAttribute(zone, field);
}
return ProcedureAttributesFromBytecodeAttribute(zone, function);
}
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) {
if (field.is_declared_in_bytecode()) {
return ProcedureAttributesFromBytecodeAttribute(zone, field);
}
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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