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dart / sdk.git / f6dd348f555c02d1cbbbaaba1b5cb43b82e9e504 / . / runtime / vm / kernel_loader.cc
blob: f5e8986347eb189f6e58d2300c0c0d8023a804ac [file] [log] [blame]
// 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.
#if !defined(DART_PRECOMPILED_RUNTIME)
#include "vm/kernel_loader.h"
#include <string.h>
#include <memory>
#include "vm/compiler/backend/flow_graph_compiler.h"
#include "vm/compiler/frontend/constant_reader.h"
#include "vm/compiler/frontend/kernel_translation_helper.h"
#include "vm/dart_api_impl.h"
#include "vm/flags.h"
#include "vm/heap/heap.h"
#include "vm/kernel_binary.h"
#include "vm/longjump.h"
#include "vm/object_store.h"
#include "vm/parser.h"
#include "vm/reusable_handles.h"
#include "vm/service_isolate.h"
#include "vm/symbols.h"
#include "vm/thread.h"
namespace dart {
namespace kernel {
#define Z (zone_)
#define I (isolate_)
#define IG (thread_->isolate_group())
#define T (type_translator_)
#define H (translation_helper_)
static const char* const kVMServiceIOLibraryUri = "dart:vmservice_io";
class SimpleExpressionConverter {
public:
SimpleExpressionConverter(TranslationHelper* translation_helper,
KernelReaderHelper* reader_helper)
: translation_helper_(*translation_helper),
zone_(translation_helper_.zone()),
simple_value_(NULL),
helper_(reader_helper) {}
bool IsSimple(intptr_t kernel_offset) {
AlternativeReadingScope alt(&helper_->reader_, kernel_offset);
uint8_t payload = 0;
Tag tag = helper_->ReadTag(&payload); // read tag.
switch (tag) {
case kBigIntLiteral: {
const String& literal_str =
H.DartString(helper_->ReadStringReference(),
Heap::kOld); // read index into string table.
simple_value_ = &Integer::ZoneHandle(Z, Integer::New(literal_str));
if (simple_value_->IsNull()) {
H.ReportError("Integer literal %s is out of range",
literal_str.ToCString());
UNREACHABLE();
}
*simple_value_ = H.Canonicalize(*simple_value_);
return true;
}
case kStringLiteral:
simple_value_ = &H.DartSymbolPlain(
helper_->ReadStringReference()); // read index into string table.
return true;
case kSpecializedIntLiteral:
simple_value_ =
&Integer::ZoneHandle(Z, Integer::New(static_cast<int32_t>(payload) -
SpecializedIntLiteralBias,
Heap::kOld));
*simple_value_ = H.Canonicalize(*simple_value_);
return true;
case kNegativeIntLiteral:
simple_value_ = &Integer::ZoneHandle(
Z, Integer::New(-static_cast<int64_t>(helper_->ReadUInt()),
Heap::kOld)); // read value.
*simple_value_ = H.Canonicalize(*simple_value_);
return true;
case kPositiveIntLiteral:
simple_value_ = &Integer::ZoneHandle(
Z, Integer::New(static_cast<int64_t>(helper_->ReadUInt()),
Heap::kOld)); // read value.
*simple_value_ = H.Canonicalize(*simple_value_);
return true;
case kDoubleLiteral:
simple_value_ = &Double::ZoneHandle(
Z, Double::New(helper_->ReadDouble(), Heap::kOld)); // read value.
*simple_value_ = H.Canonicalize(*simple_value_);
return true;
case kTrueLiteral:
simple_value_ = &Bool::Handle(Z, Bool::Get(true).ptr());
return true;
case kFalseLiteral:
simple_value_ = &Bool::Handle(Z, Bool::Get(false).ptr());
return true;
case kNullLiteral:
simple_value_ = &Instance::ZoneHandle(Z, Instance::null());
return true;
default:
return false;
}
}
const Instance& SimpleValue() { return *simple_value_; }
Zone* zone() const { return zone_; }
private:
TranslationHelper& translation_helper_;
Zone* zone_;
Instance* simple_value_;
KernelReaderHelper* helper_;
DISALLOW_COPY_AND_ASSIGN(SimpleExpressionConverter);
};
ArrayPtr KernelLoader::MakeFieldsArray() {
const intptr_t len = fields_.length();
const Array& res = Array::Handle(zone_, Array::New(len, Heap::kOld));
for (intptr_t i = 0; i < len; i++) {
res.SetAt(i, *fields_[i]);
}
return res.ptr();
}
ArrayPtr KernelLoader::MakeFunctionsArray() {
const intptr_t len = functions_.length();
const Array& res = Array::Handle(zone_, Array::New(len, Heap::kOld));
for (intptr_t i = 0; i < len; i++) {
res.SetAt(i, *functions_[i]);
}
return res.ptr();
}
LibraryPtr BuildingTranslationHelper::LookupLibraryByKernelLibrary(
NameIndex library) {
return loader_->LookupLibrary(library);
}
ClassPtr BuildingTranslationHelper::LookupClassByKernelClass(NameIndex klass) {
#if defined(DEBUG)
LibraryLookupHandleScope library_lookup_handle_scope(library_lookup_handle_);
#endif // defined(DEBUG)
library_lookup_handle_ = loader_->LookupLibraryFromClass(klass);
return loader_->LookupClass(library_lookup_handle_, klass);
}
LibraryIndex::LibraryIndex(const ExternalTypedData& kernel_data,
uint32_t binary_version)
: reader_(kernel_data), binary_version_(binary_version) {
intptr_t data_size = reader_.size();
procedure_count_ = reader_.ReadUInt32At(data_size - 4);
procedure_index_offset_ = data_size - 4 - (procedure_count_ + 1) * 4;
class_count_ = reader_.ReadUInt32At(procedure_index_offset_ - 4);
class_index_offset_ = procedure_index_offset_ - 4 - (class_count_ + 1) * 4;
source_references_offset_ = -1;
source_references_offset_ = reader_.ReadUInt32At(class_index_offset_ - 4);
}
ClassIndex::ClassIndex(const ProgramBinary& binary,
intptr_t class_offset,
intptr_t class_size)
: reader_(binary) {
Init(class_offset, class_size);
}
ClassIndex::ClassIndex(const ExternalTypedData& library_kernel_data,
intptr_t class_offset,
intptr_t class_size)
: reader_(library_kernel_data) {
Init(class_offset, class_size);
}
void ClassIndex::Init(intptr_t class_offset, intptr_t class_size) {
procedure_count_ = reader_.ReadUInt32At(class_offset + class_size - 4);
procedure_index_offset_ =
class_offset + class_size - 4 - (procedure_count_ + 1) * 4;
}
using UriToSourceTable = DirectChainedHashMap<UriToSourceTableTrait>;
KernelLoader::KernelLoader(Program* program,
UriToSourceTable* uri_to_source_table)
: program_(program),
thread_(Thread::Current()),
zone_(thread_->zone()),
no_active_isolate_scope_(),
patch_classes_(Array::ZoneHandle(zone_)),
active_class_(),
library_kernel_offset_(-1), // Set to the correct value in LoadLibrary
kernel_binary_version_(program->binary_version()),
correction_offset_(-1), // Set to the correct value in LoadLibrary
loading_native_wrappers_library_(false),
library_kernel_data_(ExternalTypedData::ZoneHandle(zone_)),
kernel_program_info_(KernelProgramInfo::ZoneHandle(zone_)),
translation_helper_(this, thread_, Heap::kOld),
helper_(zone_,
&translation_helper_,
program_->binary(),
/*data_program_offset=*/0),
constant_reader_(&helper_, &active_class_),
type_translator_(&helper_,
&constant_reader_,
&active_class_,
/* finalize= */ false),
inferred_type_metadata_helper_(&helper_, &constant_reader_),
external_name_class_(Class::Handle(Z)),
external_name_field_(Field::Handle(Z)),
annotation_list_(GrowableObjectArray::Handle(Z)),
potential_pragma_functions_(GrowableObjectArray::Handle(Z)),
static_field_value_(Object::Handle(Z)),
pragma_class_(Class::Handle(Z)),
pragma_name_field_(Field::Handle(Z)),
pragma_options_field_(Field::Handle(Z)),
name_index_handle_(Smi::Handle(Z)),
expression_evaluation_library_(Library::Handle(Z)) {
if (!program->is_single_program()) {
FATAL(
"Trying to load a concatenated dill file at a time where that is "
"not allowed");
}
InitializeFields(uri_to_source_table);
}
void KernelLoader::ReadObfuscationProhibitions() {
ObfuscationProhibitionsMetadataHelper helper(&helper_);
helper.ReadProhibitions();
}
void KernelLoader::ReadLoadingUnits() {
LoadingUnitsMetadataHelper helper(&helper_);
helper.ReadLoadingUnits();
}
Object& KernelLoader::LoadEntireProgram(Program* program,
bool process_pending_classes) {
Thread* thread = Thread::Current();
TIMELINE_DURATION(thread, Isolate, "LoadKernel");
if (program->is_single_program()) {
KernelLoader loader(program, /*uri_to_source_table=*/nullptr);
return Object::Handle(loader.LoadProgram(process_pending_classes));
}
kernel::Reader reader(program->binary());
GrowableArray<intptr_t> subprogram_file_starts;
index_programs(&reader, &subprogram_file_starts);
Zone* zone = thread->zone();
Library& library = Library::Handle(zone);
intptr_t subprogram_count = subprogram_file_starts.length() - 1;
// First index all source tables.
UriToSourceTable uri_to_source_table;
UriToSourceTableEntry wrapper;
for (intptr_t i = subprogram_count - 1; i >= 0; --i) {
intptr_t subprogram_start = subprogram_file_starts.At(i);
intptr_t subprogram_end = subprogram_file_starts.At(i + 1);
Thread* thread_ = Thread::Current();
Zone* zone_ = thread_->zone();
TranslationHelper translation_helper(thread);
KernelReaderHelper helper_(
zone_, &translation_helper,
program->binary().SubView(subprogram_start, subprogram_end), 0); // ,
const intptr_t source_table_size = helper_.SourceTableSize();
for (intptr_t index = 0; index < source_table_size; ++index) {
const String& uri_string = helper_.SourceTableUriFor(index);
wrapper.uri = &uri_string;
TypedData& line_starts =
TypedData::Handle(Z, helper_.GetLineStartsFor(index));
if (line_starts.Length() == 0) continue;
const String& script_source = helper_.GetSourceFor(index);
wrapper.uri = &uri_string;
UriToSourceTableEntry* pair = uri_to_source_table.LookupValue(&wrapper);
if (pair != NULL) {
// At least two entries with content. Unless the content is the same
// that's not valid.
const bool src_differ = pair->sources->CompareTo(script_source) != 0;
const bool line_starts_differ =
!pair->line_starts->CanonicalizeEquals(line_starts);
if (src_differ || line_starts_differ) {
FATAL3(
"Invalid kernel binary: Contains at least two source entries "
"that do not agree. URI '%s', difference: %s. Subprogram count: "
"%" Pd ".",
uri_string.ToCString(),
src_differ && line_starts_differ
? "src and line starts"
: (src_differ ? "src" : "line starts"),
subprogram_count);
}
} else {
UriToSourceTableEntry* tmp = new UriToSourceTableEntry();
tmp->uri = &uri_string;
tmp->sources = &script_source;
tmp->line_starts = &line_starts;
uri_to_source_table.Insert(tmp);
}
}
}
// Create "fake programs" for each sub-program.
for (intptr_t i = subprogram_count - 1; i >= 0; --i) {
intptr_t subprogram_start = subprogram_file_starts.At(i);
intptr_t subprogram_end = subprogram_file_starts.At(i + 1);
reader.set_raw_buffer(program->kernel_data() + subprogram_start);
reader.set_size(subprogram_end - subprogram_start);
reader.set_offset(0);
const char* error = nullptr;
std::unique_ptr<Program> subprogram = Program::ReadFrom(&reader, &error);
if (subprogram == nullptr) {
FATAL1("Failed to load kernel file: %s", error);
}
ASSERT(subprogram->is_single_program());
KernelLoader loader(subprogram.get(), &uri_to_source_table);
Object& load_result = Object::Handle(loader.LoadProgram(false));
if (load_result.IsError()) return load_result;
if (load_result.IsLibrary()) {
library ^= load_result.ptr();
}
}
if (process_pending_classes && !ClassFinalizer::ProcessPendingClasses()) {
// Class finalization failed -> sticky error would be set.
return Error::Handle(thread->StealStickyError());
}
return library;
}
void KernelLoader::index_programs(
kernel::Reader* reader,
GrowableArray<intptr_t>* subprogram_file_starts) {
// Dill files can be concatenated (e.g. cat a.dill b.dill > c.dill), so we
// need to first index the (possibly combined) file.
// First entry becomes last entry.
// Last entry is for ease of calculating size of last subprogram.
subprogram_file_starts->Add(reader->size());
reader->set_offset(reader->size() - 4);
while (reader->offset() > 0) {
intptr_t size = reader->ReadUInt32();
intptr_t start = reader->offset() - size;
if (start < 0) {
FATAL("Invalid kernel binary: Indicated size is invalid.");
}
subprogram_file_starts->Add(start);
reader->set_offset(start - 4);
}
subprogram_file_starts->Reverse();
}
StringPtr KernelLoader::FindSourceForScript(const uint8_t* kernel_buffer,
intptr_t kernel_buffer_length,
const String& uri) {
Thread* thread = Thread::Current();
Zone* zone = thread->zone();
TranslationHelper translation_helper(thread);
// Note: it is okay to have typed_data be nullptr here because we are not
// creating any long living views into the kernel_buffer.
const ProgramBinary binary = {/*typed_data=*/nullptr, kernel_buffer,
kernel_buffer_length};
KernelReaderHelper reader(zone, &translation_helper, binary, 0);
intptr_t source_table_size = reader.SourceTableSize();
for (intptr_t i = 0; i < source_table_size; ++i) {
const String& source_uri = reader.SourceTableUriFor(i);
if (source_uri.EndsWith(uri)) {
return reader.GetSourceFor(i).ptr();
}
}
return String::null();
}
void KernelLoader::InitializeFields(UriToSourceTable* uri_to_source_table) {
const intptr_t source_table_size = helper_.SourceTableSize();
const Array& scripts =
Array::Handle(Z, Array::New(source_table_size, Heap::kOld));
// Copy the Kernel string offsets out of the binary and into the VM's heap.
ASSERT(program_->string_table_offset() >= 0);
Reader reader(program_->binary());
reader.set_offset(program_->string_table_offset());
intptr_t count = reader.ReadUInt() + 1;
TypedData& offsets = TypedData::Handle(
Z, TypedData::New(kTypedDataUint32ArrayCid, count, Heap::kOld));
offsets.SetUint32(0, 0);
intptr_t end_offset = 0;
for (intptr_t i = 1; i < count; ++i) {
end_offset = reader.ReadUInt();
offsets.SetUint32(i << 2, end_offset);
}
// Create view of the string data.
const ExternalTypedData& data = ExternalTypedData::Handle(
Z,
reader.ExternalDataFromTo(reader.offset(), reader.offset() + end_offset));
// Create a view of the constants table (first part)
// and the constant table index (second part).
const ExternalTypedData& constants_table = ExternalTypedData::Handle(
Z, reader.ExternalDataFromTo(program_->constant_table_offset(),
program_->name_table_offset()));
// Copy the canonical names into the VM's heap. Encode them as unsigned, so
// the parent indexes are adjusted when extracted.
reader.set_offset(program_->name_table_offset());
count = reader.ReadUInt() * 2;
TypedData& names = TypedData::Handle(
Z, TypedData::New(kTypedDataUint32ArrayCid, count, Heap::kOld));
for (intptr_t i = 0; i < count; ++i) {
names.SetUint32(i << 2, reader.ReadUInt());
}
// Create view of metadata payloads.
const ExternalTypedData& metadata_payloads = ExternalTypedData::Handle(
Z, reader.ExternalDataFromTo(program_->metadata_payloads_offset(),
program_->metadata_mappings_offset()));
ASSERT(Utils::IsAligned(metadata_payloads.DataAddr(0), kWordSize));
// Create view of metadata mappings.
const ExternalTypedData& metadata_mappings = ExternalTypedData::Handle(
Z, reader.ExternalDataFromTo(program_->metadata_mappings_offset(),
program_->string_table_offset()));
#if defined(DEBUG)
MetadataHelper::VerifyMetadataMappings(metadata_mappings);
#endif
const Array& libraries_cache =
Array::Handle(Z, HashTables::New<UnorderedHashMap<SmiTraits>>(
program_->library_count(), Heap::kOld));
const intptr_t kClassesPerLibraryGuess = 5;
const Array& classes_cache = Array::Handle(
Z, HashTables::New<UnorderedHashMap<SmiTraits>>(
kClassesPerLibraryGuess * program_->library_count(), Heap::kOld));
kernel_program_info_ = KernelProgramInfo::New(
offsets, data, names, metadata_payloads, metadata_mappings,
constants_table, scripts, libraries_cache, classes_cache,
program_->typed_data() == nullptr ? Object::null_object()
: *program_->typed_data(),
program_->binary_version());
H.InitFromKernelProgramInfo(kernel_program_info_);
Script& script = Script::Handle(Z);
for (intptr_t index = 0; index < source_table_size; ++index) {
script = LoadScriptAt(index, uri_to_source_table);
scripts.SetAt(index, script);
}
}
KernelLoader::KernelLoader(const Script& script,
const ExternalTypedData& kernel_data,
intptr_t data_program_offset,
uint32_t kernel_binary_version)
: program_(NULL),
thread_(Thread::Current()),
zone_(thread_->zone()),
no_active_isolate_scope_(),
patch_classes_(Array::ZoneHandle(zone_)),
library_kernel_offset_(data_program_offset),
kernel_binary_version_(kernel_binary_version),
correction_offset_(0),
loading_native_wrappers_library_(false),
library_kernel_data_(ExternalTypedData::ZoneHandle(zone_)),
kernel_program_info_(
KernelProgramInfo::ZoneHandle(zone_, script.kernel_program_info())),
translation_helper_(this, thread_, Heap::kOld),
helper_(zone_, &translation_helper_, script, kernel_data, 0),
constant_reader_(&helper_, &active_class_),
type_translator_(&helper_,
&constant_reader_,
&active_class_,
/* finalize= */ false),
inferred_type_metadata_helper_(&helper_, &constant_reader_),
external_name_class_(Class::Handle(Z)),
external_name_field_(Field::Handle(Z)),
annotation_list_(GrowableObjectArray::Handle(Z)),
potential_pragma_functions_(GrowableObjectArray::Handle(Z)),
static_field_value_(Object::Handle(Z)),
pragma_class_(Class::Handle(Z)),
pragma_name_field_(Field::Handle(Z)),
pragma_options_field_(Field::Handle(Z)),
name_index_handle_(Smi::Handle(Z)),
expression_evaluation_library_(Library::Handle(Z)) {
ASSERT(T.active_class_ == &active_class_);
T.finalize_ = false;
library_kernel_data_ = kernel_data.ptr();
H.InitFromKernelProgramInfo(kernel_program_info_);
}
void KernelLoader::EvaluateDelayedPragmas() {
potential_pragma_functions_ =
kernel_program_info_.potential_pragma_functions();
if (potential_pragma_functions_.IsNull()) return;
Function& function = Function::Handle();
Library& library = Library::Handle();
Class& klass = Class::Handle();
for (int i = 0; i < potential_pragma_functions_.Length(); ++i) {
function ^= potential_pragma_functions_.At(i);
klass = function.Owner();
library = klass.library();
library.GetMetadata(function);
}
potential_pragma_functions_ = GrowableObjectArray::null();
kernel_program_info_.set_potential_pragma_functions(
GrowableObjectArray::Handle(Z));
}
void KernelLoader::AnnotateProcedures() {
annotation_list_ = kernel_program_info_.potential_natives();
const intptr_t length =
!annotation_list_.IsNull() ? annotation_list_.Length() : 0;
if (length == 0) return;
// Prepare lazy constant reading.
ConstantReader constant_reader(&helper_, &active_class_);
// Obtain `dart:_internal::ExternalName.name`.
EnsureExternalClassIsLookedUp();
EnsurePragmaClassIsLookedUp();
Instance& constant = Instance::Handle(Z);
String& native_name = String::Handle(Z);
String& pragma_name = String::Handle(Z);
Object& pragma_options = Object::Handle(Z);
// Start scanning all candidates in [potential_natives] for the annotation
// constant. If the annotation is found, flag the [Function] as native and
// attach the native name to it.
Function& function = Function::Handle(Z);
for (intptr_t i = 0; i < length; ++i) {
function ^= annotation_list_.At(i);
helper_.SetOffset(function.KernelDataProgramOffset() +
function.kernel_offset());
if (function.IsGenerativeConstructor()) {
ConstructorHelper constructor_helper(&helper_);
constructor_helper.ReadUntilExcluding(ConstructorHelper::kAnnotations);
} else {
ProcedureHelper procedure_helper(&helper_);
procedure_helper.ReadUntilExcluding(ProcedureHelper::kAnnotations);
}
const intptr_t annotation_count = helper_.ReadListLength();
for (intptr_t j = 0; j < annotation_count; ++j) {
const intptr_t tag = helper_.PeekTag();
if (tag == kConstantExpression) {
helper_.ReadByte(); // Skip the tag.
helper_.ReadPosition(); // Skip fileOffset.
helper_.SkipDartType(); // Skip type.
// We have a candidate. Let's look if it's an instance of the
// ExternalName class.
const intptr_t constant_table_index = helper_.ReadUInt();
if (constant_reader.IsInstanceConstant(constant_table_index,
external_name_class_)) {
constant = constant_reader.ReadConstant(constant_table_index);
ASSERT(constant.clazz() == external_name_class_.ptr());
// We found the annotation, let's flag the function as native and
// set the native name!
native_name ^= constant.GetField(external_name_field_);
function.set_is_native(true);
function.set_native_name(native_name);
function.set_is_external(false);
} else if (constant_reader.IsInstanceConstant(constant_table_index,
pragma_class_)) {
constant = constant_reader.ReadConstant(constant_table_index);
ASSERT(constant.clazz() == pragma_class_.ptr());
pragma_name ^= constant.GetField(pragma_name_field_);
if (pragma_name.ptr() == Symbols::vm_invisible().ptr()) {
function.set_is_visible(false);
}
// We found the annotation, let's flag the function as native and
// set the native name!
if (pragma_name.ptr() == Symbols::vm_external_name().ptr()) {
pragma_options = constant.GetField(pragma_options_field_);
if (pragma_options.IsString()) {
function.set_is_native(true);
function.set_native_name(String::Cast(pragma_options));
function.set_is_external(false);
}
}
}
} else {
helper_.SkipExpression();
}
}
}
// Clear out the list of [Function] objects which might need their native
// name to be set after reading the constant table from the kernel blob.
annotation_list_ = GrowableObjectArray::null();
kernel_program_info_.set_potential_natives(annotation_list_);
}
bool KernelLoader::IsClassName(NameIndex name,
const String& library,
const String& klass) {
ASSERT(H.IsClass(name));
StringIndex class_name_index = H.CanonicalNameString(name);
if (!H.StringEquals(class_name_index, klass.ToCString())) {
return false;
}
ASSERT(H.IsLibrary(H.CanonicalNameParent(name)));
StringIndex library_name_index =
H.CanonicalNameString(H.CanonicalNameParent(name));
return H.StringEquals(library_name_index, library.ToCString());
}
ObjectPtr KernelLoader::LoadProgram(bool process_pending_classes) {
SafepointWriteRwLocker ml(thread_, thread_->isolate_group()->program_lock());
ASSERT(kernel_program_info_.constants() == Array::null());
if (!program_->is_single_program()) {
FATAL(
"Trying to load a concatenated dill file at a time where that is "
"not allowed");
}
LongJumpScope jump;
if (setjmp(*jump.Set()) == 0) {
// Note that `problemsAsJson` on Component is implicitly skipped.
const intptr_t length = program_->library_count();
for (intptr_t i = 0; i < length; i++) {
LoadLibrary(i);
}
// Finalize still pending classes if requested.
if (process_pending_classes) {
if (!ClassFinalizer::ProcessPendingClasses()) {
// Class finalization failed -> sticky error would be set.
return H.thread()->StealStickyError();
}
}
// Sets the constants array to an empty array with the length equal to
// the number of constants. The array gets filled lazily while reading
// constants.
ASSERT(kernel_program_info_.constants_table() != ExternalTypedData::null());
ConstantReader constant_reader(&helper_, &active_class_);
const intptr_t num_consts = constant_reader.NumConstants();
const Array& array = Array::Handle(Z, Array::New(num_consts, Heap::kOld));
for (intptr_t i = 0; i < num_consts; i++) {
array.SetAt(i, Object::sentinel());
}
kernel_program_info_.set_constants(array);
H.SetConstants(array); // for caching
AnnotateProcedures();
EvaluateDelayedPragmas();
NameIndex main = program_->main_method();
if (main != -1) {
NameIndex main_library = H.EnclosingName(main);
return LookupLibrary(main_library);
}
return Library::null();
}
// Either class finalization failed or we caught a compile error.
// In both cases sticky error would be set.
return Thread::Current()->StealStickyError();
}
void KernelLoader::LoadLibrary(const Library& library) {
// This will be invoked by VM bootstrapping code.
SafepointWriteRwLocker ml(thread_, thread_->isolate_group()->program_lock());
ASSERT(!library.Loaded());
const auto& uri = String::Handle(Z, library.url());
const intptr_t num_libraries = program_->library_count();
for (intptr_t i = 0; i < num_libraries; ++i) {
const String& library_uri = LibraryUri(i);
if (library_uri.Equals(uri)) {
LoadLibrary(i);
return;
}
}
}
ObjectPtr KernelLoader::LoadExpressionEvaluationFunction(
const String& library_url,
const String& klass) {
// Find the original context, i.e. library/class, in which the evaluation will
// happen.
const Library& real_library =
Library::Handle(Z, Library::LookupLibrary(thread_, library_url));
ASSERT(!real_library.IsNull());
const Class& real_class = Class::Handle(
Z, klass.IsNull() ? real_library.toplevel_class()
: real_library.LookupClassAllowPrivate(klass));
ASSERT(!real_class.IsNull());
const intptr_t num_cids = IG->class_table()->NumCids();
const intptr_t num_libs =
GrowableObjectArray::Handle(IG->object_store()->libraries()).Length();
// Load the "evaluate:source" expression evaluation library.
ASSERT(expression_evaluation_library_.IsNull());
ASSERT(H.GetExpressionEvaluationClass().IsNull());
ASSERT(H.GetExpressionEvaluationFunction().IsNull());
H.SetExpressionEvaluationRealClass(real_class);
const Object& result = Object::Handle(Z, LoadProgram(true));
if (result.IsError()) {
return result.ptr();
}
const Function& function = H.GetExpressionEvaluationFunction();
ASSERT(!function.IsNull());
ASSERT(
GrowableObjectArray::Handle(IG->object_store()->libraries()).Length() ==
num_libs);
ASSERT(IG->class_table()->NumCids() == num_cids);
// Make the expression evaluation function have the right script,
// kernel data and parent.
const auto& eval_script = Script::Handle(Z, function.script());
ASSERT(!expression_evaluation_library_.IsNull());
auto& kernel_data = ExternalTypedData::Handle(
Z, expression_evaluation_library_.kernel_data());
intptr_t kernel_offset = expression_evaluation_library_.kernel_offset();
function.SetKernelDataAndScript(eval_script, kernel_data, kernel_offset);
function.set_owner(real_class);
ASSERT(real_class.is_finalized());
// The owner class has already been marked as finalized so the signature of
// this added function must be finalized here, since finalization of member
// types will not be called anymore.
FunctionType& signature = FunctionType::Handle(Z, function.signature());
if (!function.is_static()) {
// Patch the illegal receiver type (type class with kIllegalCid) to dynamic.
signature.SetParameterTypeAt(0, Object::dynamic_type());
}
signature ^= ClassFinalizer::FinalizeType(signature);
function.SetSignature(signature);
return function.ptr();
}
void KernelLoader::FindModifiedLibraries(Program* program,
IsolateGroup* isolate_group,
BitVector* modified_libs,
bool force_reload,
bool* is_empty_program,
intptr_t* p_num_classes,
intptr_t* p_num_procedures) {
LongJumpScope jump;
Zone* zone = Thread::Current()->zone();
if (setjmp(*jump.Set()) == 0) {
if (force_reload) {
// If a reload is being forced we mark all libraries as having
// been modified.
const auto& libs = GrowableObjectArray::Handle(
isolate_group->object_store()->libraries());
intptr_t num_libs = libs.Length();
Library& lib = dart::Library::Handle(zone);
for (intptr_t i = 0; i < num_libs; i++) {
lib ^= libs.At(i);
if (!lib.is_dart_scheme()) {
modified_libs->Add(lib.index());
}
}
return;
}
if (p_num_classes != nullptr) {
*p_num_classes = 0;
}
if (p_num_procedures != nullptr) {
*p_num_procedures = 0;
}
// Now go through all the libraries that are present in the incremental
// kernel files, these will constitute the modified libraries.
*is_empty_program = true;
if (program->is_single_program()) {
KernelLoader loader(program, /*uri_to_source_table=*/nullptr);
loader.walk_incremental_kernel(modified_libs, is_empty_program,
p_num_classes, p_num_procedures);
}
kernel::Reader reader(program->binary());
GrowableArray<intptr_t> subprogram_file_starts;
index_programs(&reader, &subprogram_file_starts);
// Create "fake programs" for each sub-program.
intptr_t subprogram_count = subprogram_file_starts.length() - 1;
for (intptr_t i = 0; i < subprogram_count; ++i) {
intptr_t subprogram_start = subprogram_file_starts.At(i);
intptr_t subprogram_end = subprogram_file_starts.At(i + 1);
reader.set_raw_buffer(program->kernel_data() + subprogram_start);
reader.set_size(subprogram_end - subprogram_start);
reader.set_offset(0);
const char* error = nullptr;
std::unique_ptr<Program> subprogram = Program::ReadFrom(&reader, &error);
if (subprogram == nullptr) {
FATAL1("Failed to load kernel file: %s", error);
}
ASSERT(subprogram->is_single_program());
KernelLoader loader(subprogram.get(), /*uri_to_source_table=*/nullptr);
loader.walk_incremental_kernel(modified_libs, is_empty_program,
p_num_classes, p_num_procedures);
}
}
}
void KernelLoader::walk_incremental_kernel(BitVector* modified_libs,
bool* is_empty_program,
intptr_t* p_num_classes,
intptr_t* p_num_procedures) {
intptr_t length = program_->library_count();
*is_empty_program = *is_empty_program && (length == 0);
bool collect_library_stats =
p_num_classes != nullptr || p_num_procedures != nullptr;
intptr_t num_classes = 0;
intptr_t num_procedures = 0;
Library& lib = Library::Handle(Z);
for (intptr_t i = 0; i < length; i++) {
intptr_t kernel_offset = library_offset(i);
helper_.SetOffset(kernel_offset);
LibraryHelper library_helper(&helper_, kernel_binary_version_);
library_helper.ReadUntilIncluding(LibraryHelper::kCanonicalName);
lib = LookupLibraryOrNull(library_helper.canonical_name_);
if (!lib.IsNull() && !lib.is_dart_scheme()) {
// This is a library that already exists so mark it as being modified.
modified_libs->Add(lib.index());
}
if (collect_library_stats) {
intptr_t library_end = library_offset(i + 1);
library_kernel_data_ =
helper_.reader_.ExternalDataFromTo(kernel_offset, library_end);
LibraryIndex library_index(library_kernel_data_, kernel_binary_version_);
num_classes += library_index.class_count();
num_procedures += library_index.procedure_count();
}
}
if (p_num_classes != nullptr) {
*p_num_classes += num_classes;
}
if (p_num_procedures != nullptr) {
*p_num_procedures += num_procedures;
}
}
void KernelLoader::ReadInferredType(const Field& field,
intptr_t kernel_offset) {
const InferredTypeMetadata type =
inferred_type_metadata_helper_.GetInferredType(kernel_offset,
/*read_constant=*/false);
if (type.IsTrivial()) {
return;
}
field.set_guarded_cid(type.cid);
field.set_is_nullable(type.IsNullable());
field.set_guarded_list_length(Field::kNoFixedLength);
if (FLAG_precompiled_mode) {
field.set_is_unboxing_candidate(
!field.is_late() && !field.is_static() &&
((field.guarded_cid() == kDoubleCid &&
FlowGraphCompiler::SupportsUnboxedDoubles()) ||
(field.guarded_cid() == kFloat32x4Cid &&
FlowGraphCompiler::SupportsUnboxedSimd128()) ||
(field.guarded_cid() == kFloat64x2Cid &&
FlowGraphCompiler::SupportsUnboxedSimd128()) ||
type.IsInt()) &&
!field.is_nullable());
field.set_is_non_nullable_integer(!field.is_nullable() && type.IsInt());
}
}
void KernelLoader::CheckForInitializer(const Field& field) {
if (helper_.PeekTag() == kSomething) {
field.set_has_initializer(true);
SimpleExpressionConverter converter(&H, &helper_);
const bool has_simple_initializer =
converter.IsSimple(helper_.ReaderOffset() + 1);
if (!has_simple_initializer ||
(!field.is_static() && !converter.SimpleValue().IsNull())) {
field.set_has_nontrivial_initializer(true);
}
return;
}
field.set_has_initializer(false);
field.set_has_nontrivial_initializer(false);
}
LibraryPtr KernelLoader::LoadLibrary(intptr_t index) {
if (!program_->is_single_program()) {
FATAL(
"Trying to load a concatenated dill file at a time where that is "
"not allowed");
}
// Read library index.
library_kernel_offset_ = library_offset(index);
correction_offset_ = library_kernel_offset_;
intptr_t library_end = library_offset(index + 1);
intptr_t library_size = library_end - library_kernel_offset_;
// NOTE: Since |helper_| is used to load the overall kernel program,
// it's reader's offset is an offset into the overall kernel program.
// Hence, when setting the kernel offsets of field and functions, one
// has to subtract the library's kernel offset from the reader's
// offset.
helper_.SetOffset(library_kernel_offset_);
LibraryHelper library_helper(&helper_, kernel_binary_version_);
library_helper.ReadUntilIncluding(LibraryHelper::kCanonicalName);
if (!FLAG_precompiled_mode && !IG->should_load_vmservice()) {
StringIndex lib_name_index =
H.CanonicalNameString(library_helper.canonical_name_);
if (H.StringEquals(lib_name_index, kVMServiceIOLibraryUri)) {
// We are not the service isolate and we are not generating an AOT
// snapshot so we skip loading 'dart:vmservice_io'.
skip_vmservice_library_ = library_helper.canonical_name_;
ASSERT(H.IsLibrary(skip_vmservice_library_));
return Library::null();
}
}
Library& library =
Library::Handle(Z, LookupLibrary(library_helper.canonical_name_));
if (library.Loaded()) return library.ptr();
library.set_is_nnbd(library_helper.IsNonNullableByDefault());
const NNBDCompiledMode mode =
library_helper.GetNonNullableByDefaultCompiledMode();
if (mode == NNBDCompiledMode::kInvalid) {
H.ReportError(
"Library '%s' was compiled in an unsupported mixed mode between sound "
"null safety and not sound null safety.",
String::Handle(library.url()).ToCString());
}
if (!IG->null_safety() && mode == NNBDCompiledMode::kStrong) {
H.ReportError(
"Library '%s' was compiled with sound null safety (in strong mode) and "
"it "
"requires --sound-null-safety option at runtime",
String::Handle(library.url()).ToCString());
}
if (IG->null_safety() && (mode == NNBDCompiledMode::kWeak)) {
H.ReportError(
"Library '%s' was compiled without sound null safety (in weak mode) "
"and it "
"cannot be used with --sound-null-safety at runtime",
String::Handle(library.url()).ToCString());
}
library.set_nnbd_compiled_mode(mode);
library_kernel_data_ = helper_.reader_.ExternalDataFromTo(
library_kernel_offset_, library_kernel_offset_ + library_size);
library.set_kernel_data(library_kernel_data_);
library.set_kernel_offset(library_kernel_offset_);
LibraryIndex library_index(library_kernel_data_, kernel_binary_version_);
intptr_t class_count = library_index.class_count();
library_helper.ReadUntilIncluding(LibraryHelper::kName);
library.SetName(H.DartSymbolObfuscate(library_helper.name_index_));
// The bootstrapper will take care of creating the native wrapper classes, but
// we will add the synthetic constructors to them here.
if (library.name() ==
Symbols::Symbol(Symbols::kDartNativeWrappersLibNameId).ptr()) {
ASSERT(library.LoadInProgress());
loading_native_wrappers_library_ = true;
} else {
loading_native_wrappers_library_ = false;
library.SetLoadInProgress();
}
library_helper.ReadUntilIncluding(LibraryHelper::kSourceUriIndex);
const Script& script =
Script::Handle(Z, ScriptAt(library_helper.source_uri_index_));
library_helper.ReadUntilExcluding(LibraryHelper::kAnnotations);
intptr_t annotations_kernel_offset =
helper_.ReaderOffset() - correction_offset_;
intptr_t annotation_count = helper_.ReadListLength(); // read list length.
if (annotation_count > 0) {
// This must wait until we can evaluate constants.
// So put on the "pending" list.
H.AddPotentialExtensionLibrary(library);
}
for (intptr_t i = 0; i < annotation_count; ++i) {
helper_.SkipExpression(); // read ith annotation.
}
library_helper.SetJustRead(LibraryHelper::kAnnotations);
// Setup toplevel class (which contains library fields/procedures).
// We do not register expression evaluation classes with the VM:
// The expression evaluation functions should be GC-able as soon as
// they are not reachable anymore and we never look them up by name.
const bool register_class =
library.ptr() != expression_evaluation_library_.ptr();
Class& toplevel_class =
Class::Handle(Z, Class::New(library, Symbols::TopLevel(), script,
TokenPosition::kNoSource, register_class));
toplevel_class.set_is_abstract();
toplevel_class.set_is_declaration_loaded();
toplevel_class.set_is_type_finalized();
toplevel_class.set_num_type_arguments_unsafe(0);
library.set_toplevel_class(toplevel_class);
library_helper.ReadUntilExcluding(LibraryHelper::kDependencies);
LoadLibraryImportsAndExports(&library, toplevel_class);
library_helper.SetJustRead(LibraryHelper::kDependencies);
// Everything up til the classes are skipped implicitly, and library_helper
// is no longer used.
const GrowableObjectArray& classes =
GrowableObjectArray::Handle(Z, IG->object_store()->pending_classes());
// Load all classes.
intptr_t next_class_offset = library_index.ClassOffset(0);
Class& klass = Class::Handle(Z);
for (intptr_t i = 0; i < class_count; ++i) {
helper_.SetOffset(next_class_offset);
next_class_offset = library_index.ClassOffset(i + 1);
LoadClass(library, toplevel_class, next_class_offset, &klass);
if (register_class) {
classes.Add(klass, Heap::kOld);
}
}
if (loading_native_wrappers_library_ || !register_class) {
FinishTopLevelClassLoading(toplevel_class, library, library_index);
}
if (FLAG_enable_mirrors && annotation_count > 0) {
ASSERT(annotations_kernel_offset > 0);
library.AddMetadata(library, annotations_kernel_offset);
}
if (register_class) {
helper_.SetOffset(library_index.SourceReferencesOffset());
intptr_t count = helper_.ReadUInt();
const GrowableObjectArray& used_scripts =
GrowableObjectArray::Handle(library.used_scripts());
Script& script = Script::Handle(Z);
for (intptr_t i = 0; i < count; i++) {
intptr_t uri_index = helper_.ReadUInt();
script = ScriptAt(uri_index);
used_scripts.Add(script);
}
}
if (!library.Loaded()) library.SetLoaded();
return library.ptr();
}
void KernelLoader::FinishTopLevelClassLoading(
const Class& toplevel_class,
const Library& library,
const LibraryIndex& library_index) {
if (toplevel_class.is_loaded()) {
return;
}
TIMELINE_DURATION(Thread::Current(), Isolate, "FinishTopLevelClassLoading");
ActiveClassScope active_class_scope(&active_class_, &toplevel_class);
// Offsets within library index are whole program offsets and not
// relative to the library.
const intptr_t correction = correction_offset_ - library_kernel_offset_;
helper_.SetOffset(library_index.ClassOffset(library_index.class_count()) +
correction);
if (kernel_binary_version_ >= 30) {
const intptr_t extension_count = helper_.ReadListLength();
for (intptr_t i = 0; i < extension_count; ++i) {
helper_.ReadTag(); // read tag.
helper_.SkipCanonicalNameReference(); // skip canonical name.
helper_.SkipStringReference(); // skip name.
helper_.SkipListOfExpressions(); // skip annotations.
helper_.ReadUInt(); // read source uri index.
helper_.ReadPosition(); // read file offset.
helper_.ReadByte(); // skip flags.
helper_.SkipTypeParametersList(); // skip type parameter list.
helper_.SkipDartType(); // skip on-type.
Tag tag = helper_.ReadTag();
if (tag != kNothing) {
helper_.SkipListOfDartTypes(); // skip shown types.
helper_.SkipListOfCanonicalNameReferences(); // skip shown members.
helper_.SkipListOfCanonicalNameReferences(); // skip shown getters.
helper_.SkipListOfCanonicalNameReferences(); // skip shown setters.
helper_.SkipListOfCanonicalNameReferences(); // skip shown operators.
helper_.SkipListOfDartTypes(); // skip hidden types.
helper_.SkipListOfCanonicalNameReferences(); // skip hidden members.
helper_.SkipListOfCanonicalNameReferences(); // skip hidden getters.
helper_.SkipListOfCanonicalNameReferences(); // skip hidden setters.
helper_.SkipListOfCanonicalNameReferences(); // skip hidden operators.
}
const intptr_t extension_member_count = helper_.ReadListLength();
for (intptr_t j = 0; j < extension_member_count; ++j) {
helper_.SkipName(); // skip name.
helper_.ReadByte(); // read kind.
helper_.ReadByte(); // read flags.
helper_.SkipCanonicalNameReference(); // skip member reference
}
}
}
fields_.Clear();
functions_.Clear();
// Load toplevel fields.
const intptr_t field_count = helper_.ReadListLength(); // read list length.
for (intptr_t i = 0; i < field_count; ++i) {
intptr_t field_offset = helper_.ReaderOffset() - correction_offset_;
ActiveMemberScope active_member_scope(&active_class_, NULL);
FieldHelper field_helper(&helper_);
field_helper.ReadUntilExcluding(FieldHelper::kName);
const String& name = helper_.ReadNameAsFieldName();
field_helper.SetJustRead(FieldHelper::kName);
field_helper.ReadUntilExcluding(FieldHelper::kAnnotations);
intptr_t annotation_count = helper_.ReadListLength();
bool has_pragma_annotation;
ReadVMAnnotations(library, annotation_count, /*native_name=*/nullptr,
/*scan_annotations_lazy=*/nullptr,
/*is_invisible_function=*/nullptr,
&has_pragma_annotation);
field_helper.SetJustRead(FieldHelper::kAnnotations);
field_helper.ReadUntilExcluding(FieldHelper::kType);
const Object& script_class =
ClassForScriptAt(toplevel_class, field_helper.source_uri_index_);
// In the VM all const fields are implicitly final whereas in Kernel they
// are not final because they are not explicitly declared that way.
const bool is_final = field_helper.IsConst() || field_helper.IsFinal();
// Only instance fields could be covariant.
ASSERT(!field_helper.IsCovariant() &&
!field_helper.IsGenericCovariantImpl());
const bool is_late = field_helper.IsLate();
const bool is_extension_member = field_helper.IsExtensionMember();
const Field& field = Field::Handle(
Z, Field::NewTopLevel(name, is_final, field_helper.IsConst(), is_late,
script_class, field_helper.position_,
field_helper.end_position_));
field.set_kernel_offset(field_offset);
field.set_has_pragma(has_pragma_annotation);
field.set_is_extension_member(is_extension_member);
const AbstractType& type = T.BuildType(); // read type.
field.SetFieldType(type);
ReadInferredType(field, field_offset + library_kernel_offset_);
CheckForInitializer(field);
// In NNBD libraries, static fields with initializers are
// implicitly late.
if (field.has_initializer() && library.is_nnbd()) {
field.set_is_late(true);
}
field_helper.SetJustRead(FieldHelper::kType);
field_helper.ReadUntilExcluding(FieldHelper::kInitializer);
intptr_t field_initializer_offset = helper_.ReaderOffset();
field_helper.ReadUntilExcluding(FieldHelper::kEnd);
{
// GenerateFieldAccessors reads (some of) the initializer.
AlternativeReadingScope alt(&helper_.reader_, field_initializer_offset);
static_field_value_ =
GenerateFieldAccessors(toplevel_class, field, &field_helper);
}
IG->RegisterStaticField(field, static_field_value_);
if ((FLAG_enable_mirrors || has_pragma_annotation) &&
annotation_count > 0) {
library.AddMetadata(field, field_offset);
}
fields_.Add(&field);
}
ASSERT(!toplevel_class.is_loaded());
// Load toplevel procedures.
intptr_t next_procedure_offset =
library_index.ProcedureOffset(0) + correction;
const intptr_t procedure_count = library_index.procedure_count();
for (intptr_t i = 0; i < procedure_count; ++i) {
helper_.SetOffset(next_procedure_offset);
next_procedure_offset = library_index.ProcedureOffset(i + 1) + correction;
LoadProcedure(library, toplevel_class, false, next_procedure_offset);
// LoadProcedure calls Library::GetMetadata which invokes Dart code
// which may recursively trigger class finalization and
// FinishTopLevelClassLoading.
// In such case, return immediately and avoid overwriting already finalized
// functions with freshly loaded and not yet finalized.
if (toplevel_class.is_loaded()) {
return;
}
}
toplevel_class.SetFields(Array::Handle(MakeFieldsArray()));
toplevel_class.SetFunctions(Array::Handle(MakeFunctionsArray()));
String& name = String::Handle(Z);
for (intptr_t i = 0, n = fields_.length(); i < n; ++i) {
const Field* field = fields_.At(i);
name = field->name();
library.AddObject(*field, name);
}
for (intptr_t i = 0, n = functions_.length(); i < n; ++i) {
const Function* function = functions_.At(i);
name = function->name();
library.AddObject(*function, name);
}
ASSERT(!toplevel_class.is_loaded());
toplevel_class.set_is_loaded(true);
}
void KernelLoader::LoadLibraryImportsAndExports(Library* library,
const Class& toplevel_class) {
GrowableObjectArray& show_list = GrowableObjectArray::Handle(Z);
GrowableObjectArray& hide_list = GrowableObjectArray::Handle(Z);
Array& show_names = Array::Handle(Z);
Array& hide_names = Array::Handle(Z);
Namespace& ns = Namespace::Handle(Z);
LibraryPrefix& library_prefix = LibraryPrefix::Handle(Z);
const intptr_t deps_count = helper_.ReadListLength();
const Array& deps = Array::Handle(Array::New(deps_count));
for (intptr_t dep = 0; dep < deps_count; ++dep) {
LibraryDependencyHelper dependency_helper(&helper_);
dependency_helper.ReadUntilExcluding(LibraryDependencyHelper::kAnnotations);
intptr_t annotations_kernel_offset =
helper_.ReaderOffset() - correction_offset_;
dependency_helper.ReadUntilExcluding(LibraryDependencyHelper::kCombinators);
// Ignore the dependency if the target library is invalid.
// The error will be caught during compilation.
if (dependency_helper.target_library_canonical_name_ < 0) {
const intptr_t combinator_count = helper_.ReadListLength();
for (intptr_t c = 0; c < combinator_count; ++c) {
helper_.SkipLibraryCombinator();
}
continue;
}
// Prepare show and hide lists.
show_list = GrowableObjectArray::New(Heap::kOld);
hide_list = GrowableObjectArray::New(Heap::kOld);
const intptr_t combinator_count = helper_.ReadListLength();
for (intptr_t c = 0; c < combinator_count; ++c) {
uint8_t flags = helper_.ReadFlags();
intptr_t name_count = helper_.ReadListLength();
for (intptr_t n = 0; n < name_count; ++n) {
String& show_hide_name =
H.DartSymbolObfuscate(helper_.ReadStringReference());
if ((flags & LibraryDependencyHelper::Show) != 0) {
show_list.Add(show_hide_name, Heap::kOld);
} else {
hide_list.Add(show_hide_name, Heap::kOld);
}
}
}
if (show_list.Length() > 0) {
show_names = Array::MakeFixedLength(show_list);
} else {
show_names = Array::null();
}
if (hide_list.Length() > 0) {
hide_names = Array::MakeFixedLength(hide_list);
} else {
hide_names = Array::null();
}
Library& target_library = Library::Handle(
Z, LookupLibrary(dependency_helper.target_library_canonical_name_));
if (!FLAG_enable_mirrors &&
target_library.url() == Symbols::DartMirrors().ptr()) {
H.ReportError(
"import of dart:mirrors is not supported in the current Dart "
"runtime");
}
if (!Api::IsFfiEnabled() &&
target_library.url() == Symbols::DartFfi().ptr() &&
library->url() != Symbols::DartCore().ptr() &&
library->url() != Symbols::DartInternal().ptr()) {
H.ReportError(
"import of dart:ffi is not supported in the current Dart runtime");
}
String& prefix = H.DartSymbolPlain(dependency_helper.name_index_);
ns = Namespace::New(target_library, show_names, hide_names, *library);
if ((dependency_helper.flags_ & LibraryDependencyHelper::Export) != 0) {
library->AddExport(ns);
} else {
if (prefix.IsNull() || prefix.Length() == 0) {
library->AddImport(ns);
} else {
library_prefix = library->LookupLocalLibraryPrefix(prefix);
if (!library_prefix.IsNull()) {
library_prefix.AddImport(ns);
} else {
library_prefix = LibraryPrefix::New(
prefix, ns,
(dependency_helper.flags_ & LibraryDependencyHelper::Deferred) !=
0,
*library);
library->AddObject(library_prefix, prefix);
}
}
}
if (FLAG_enable_mirrors && dependency_helper.annotation_count_ > 0) {
ASSERT(annotations_kernel_offset > 0);
library->AddMetadata(ns, annotations_kernel_offset);
}
if (prefix.IsNull()) {
deps.SetAt(dep, ns);
} else {
deps.SetAt(dep, library_prefix);
}
}
library->set_dependencies(deps);
}
void KernelLoader::LoadPreliminaryClass(ClassHelper* class_helper,
intptr_t type_parameter_count) {
const Class* klass = active_class_.klass;
// Enable access to type_parameters().
klass->set_is_declaration_loaded();
// Note: This assumes that ClassHelper is exactly at the position where
// the length of the type parameters have been read, and that the order in
// the binary is as follows: [...], kTypeParameters, kSuperClass, kMixinType,
// kImplementedClasses, [...].
// Set type parameters.
T.LoadAndSetupTypeParameters(&active_class_, Object::null_function(), *klass,
Object::null_function_type(),
type_parameter_count);
ActiveTypeParametersScope scope(&active_class_, nullptr, Z);
T.LoadAndSetupBounds(&active_class_, Object::null_function(), *klass,
Object::null_function_type(), type_parameter_count);
// Set super type. Some classes (e.g., Object) do not have one.
Tag type_tag = helper_.ReadTag(); // read super class type (part 1).
if (type_tag == kSomething) {
AbstractType& super_type =
T.BuildTypeWithoutFinalization(); // read super class type (part 2).
klass->set_super_type(super_type);
}
class_helper->SetJustRead(ClassHelper::kSuperClass);
class_helper->ReadUntilIncluding(ClassHelper::kMixinType);
// Build implemented interface types
intptr_t interface_count = helper_.ReadListLength();
const Array& interfaces =
Array::Handle(Z, Array::New(interface_count, Heap::kOld));
for (intptr_t i = 0; i < interface_count; i++) {
const AbstractType& type =
T.BuildTypeWithoutFinalization(); // read ith type.
interfaces.SetAt(i, type);
}
class_helper->SetJustRead(ClassHelper::kImplementedClasses);
klass->set_interfaces(interfaces);
if (class_helper->is_abstract()) klass->set_is_abstract();
if (class_helper->is_transformed_mixin_application()) {
klass->set_is_transformed_mixin_application();
}
if (class_helper->has_const_constructor()) {
klass->set_is_const();
}
}
void KernelLoader::LoadClass(const Library& library,
const Class& toplevel_class,
intptr_t class_end,
Class* out_class) {
intptr_t class_offset = helper_.ReaderOffset();
ClassIndex class_index(program_->binary(), class_offset,
class_end - class_offset);
ClassHelper class_helper(&helper_);
class_helper.ReadUntilIncluding(ClassHelper::kCanonicalName);
*out_class = LookupClass(library, class_helper.canonical_name_);
out_class->set_kernel_offset(class_offset - correction_offset_);
// The class needs to have a script because all the functions in the class
// will inherit it. The predicate Function::IsOptimizable uses the absence of
// a script to detect test functions that should not be optimized.
if (out_class->script() == Script::null()) {
class_helper.ReadUntilIncluding(ClassHelper::kSourceUriIndex);
const Script& script =
Script::Handle(Z, ScriptAt(class_helper.source_uri_index_));
out_class->set_script(script);
}
if (out_class->token_pos() == TokenPosition::kNoSource) {
class_helper.ReadUntilIncluding(ClassHelper::kEndPosition);
out_class->set_token_pos(class_helper.start_position_);
out_class->set_end_token_pos(class_helper.end_position_);
}
class_helper.ReadUntilIncluding(ClassHelper::kFlags);
if (class_helper.is_enum_class()) {
out_class->set_is_enum_class();
}
class_helper.ReadUntilExcluding(ClassHelper::kAnnotations);
intptr_t annotation_count = helper_.ReadListLength();
bool has_pragma_annotation = false;
ReadVMAnnotations(library, annotation_count, /*native_name=*/nullptr,
/*scan_annotations_lazy=*/nullptr,
/*is_invisible_function=*/nullptr, &has_pragma_annotation);
if (has_pragma_annotation) {
out_class->set_has_pragma(true);
}
class_helper.SetJustRead(ClassHelper::kAnnotations);
class_helper.ReadUntilExcluding(ClassHelper::kTypeParameters);
intptr_t type_parameter_counts =
helper_.ReadListLength(); // read type_parameters list length.
ActiveClassScope active_class_scope(&active_class_, out_class);
if (!out_class->is_declaration_loaded()) {
LoadPreliminaryClass(&class_helper, type_parameter_counts);
} else {
ASSERT(type_parameter_counts == 0);
class_helper.SetJustRead(ClassHelper::kTypeParameters);
}
if ((FLAG_enable_mirrors || has_pragma_annotation) && annotation_count > 0) {
library.AddMetadata(*out_class, class_offset - correction_offset_);
}
// We do not register expression evaluation classes with the VM:
// The expression evaluation functions should be GC-able as soon as
// they are not reachable anymore and we never look them up by name.
const bool register_class =
library.ptr() != expression_evaluation_library_.ptr();
if (!register_class) {
H.SetExpressionEvaluationClass(*out_class);
}
if (loading_native_wrappers_library_ || !register_class) {
FinishClassLoading(*out_class, library, toplevel_class, class_offset,
class_index, &class_helper);
}
helper_.SetOffset(class_end);
}
void KernelLoader::FinishClassLoading(const Class& klass,
const Library& library,
const Class& toplevel_class,
intptr_t class_offset,
const ClassIndex& class_index,
ClassHelper* class_helper) {
if (klass.is_loaded()) {
return;
}
TIMELINE_DURATION(Thread::Current(), Isolate, "FinishClassLoading");
ActiveClassScope active_class_scope(&active_class_, &klass);
// If this is a dart:internal.ClassID class ignore field declarations
// contained in the Kernel file and instead inject our own const
// fields.
const bool discard_fields = klass.InjectCIDFields();
fields_.Clear();
functions_.Clear();
if (!discard_fields) {
class_helper->ReadUntilExcluding(ClassHelper::kFields);
int field_count = helper_.ReadListLength(); // read list length.
for (intptr_t i = 0; i < field_count; ++i) {
intptr_t field_offset = helper_.ReaderOffset() - correction_offset_;
ActiveMemberScope active_member(&active_class_, NULL);
FieldHelper field_helper(&helper_);
field_helper.ReadUntilIncluding(FieldHelper::kSourceUriIndex);
const Object& script_class =
ClassForScriptAt(klass, field_helper.source_uri_index_);
field_helper.ReadUntilExcluding(FieldHelper::kName);
const String& name = helper_.ReadNameAsFieldName();
field_helper.SetJustRead(FieldHelper::kName);
field_helper.ReadUntilExcluding(FieldHelper::kAnnotations);
intptr_t annotation_count = helper_.ReadListLength();
bool has_pragma_annotation;
ReadVMAnnotations(library, annotation_count, /*native_name=*/nullptr,
/*scan_annotations_lazy=*/nullptr,
/*is_invisible_function=*/nullptr,
&has_pragma_annotation);
field_helper.SetJustRead(FieldHelper::kAnnotations);
field_helper.ReadUntilExcluding(FieldHelper::kType);
const AbstractType& type =
T.BuildTypeWithoutFinalization(); // read type.
field_helper.SetJustRead(FieldHelper::kType);
const bool is_reflectable =
field_helper.position_.IsReal() &&
!(library.is_dart_scheme() && library.IsPrivate(name));
// In the VM all const fields are implicitly final whereas in Kernel they
// are not final because they are not explicitly declared that way.
const bool is_final = field_helper.IsConst() || field_helper.IsFinal();
const bool is_late = field_helper.IsLate();
const bool is_extension_member = field_helper.IsExtensionMember();
Field& field = Field::Handle(
Z, Field::New(name, field_helper.IsStatic(), is_final,
field_helper.IsConst(), is_reflectable, is_late,
script_class, type, field_helper.position_,
field_helper.end_position_));
field.set_kernel_offset(field_offset);
field.set_has_pragma(has_pragma_annotation);
field.set_is_covariant(field_helper.IsCovariant());
field.set_is_generic_covariant_impl(
field_helper.IsGenericCovariantImpl());
field.set_is_extension_member(is_extension_member);
ReadInferredType(field, field_offset + library_kernel_offset_);
CheckForInitializer(field);
// In NNBD libraries, static fields with initializers are
// implicitly late.
if (field_helper.IsStatic() && field.has_initializer() &&
library.is_nnbd()) {
field.set_is_late(true);
}
field_helper.ReadUntilExcluding(FieldHelper::kInitializer);
intptr_t field_initializer_offset = helper_.ReaderOffset();
field_helper.ReadUntilExcluding(FieldHelper::kEnd);
{
// GenerateFieldAccessors reads (some of) the initializer.
AlternativeReadingScope alt(&helper_.reader_, field_initializer_offset);
static_field_value_ =
GenerateFieldAccessors(klass, field, &field_helper);
}
if (field.is_static()) {
IG->RegisterStaticField(field, static_field_value_);
}
if ((FLAG_enable_mirrors || has_pragma_annotation) &&
annotation_count > 0) {
library.AddMetadata(field, field_offset);
}
fields_.Add(&field);
}
class_helper->SetJustRead(ClassHelper::kFields);
if (klass.is_enum_class()) {
// Add static field 'const _deleted_enum_sentinel'.
// This field does not need to be of type E.
Field& deleted_enum_sentinel = Field::ZoneHandle(Z);
deleted_enum_sentinel =
Field::New(Symbols::_DeletedEnumSentinel(),
/* is_static = */ true,
/* is_final = */ true,
/* is_const = */ true,
/* is_reflectable = */ false,
/* is_late = */ false, klass, Object::dynamic_type(),
TokenPosition::kNoSource, TokenPosition::kNoSource);
IG->RegisterStaticField(deleted_enum_sentinel, Object::Handle());
fields_.Add(&deleted_enum_sentinel);
}
// TODO(https://dartbug.com/44454): Make VM recognize the Struct class.
//
// The FfiTrampolines currently allocate subtypes of structs and store
// TypedData in them, without using guards because they are force
// optimized. We immediately set the guarded_cid_ to kDynamicCid, which
// is effectively the same as calling this method first with Pointer and
// subsequently with TypedData with field guards.
if (klass.UserVisibleName() == Symbols::Compound().ptr() &&
Library::Handle(Z, klass.library()).url() == Symbols::DartFfi().ptr()) {
ASSERT(fields_.length() == 1);
ASSERT(String::Handle(Z, fields_[0]->name())
.StartsWith(Symbols::_typedDataBase()));
fields_[0]->set_guarded_cid(kDynamicCid);
fields_[0]->set_is_nullable(true);
}
// Check that subclasses of AbiSpecificInteger have a mapping for the
// current ABI.
//
// TODO(https://github.com/dart-lang/language/issues/1889): If we make
// kernel know about the target platform, we can move this check to the
// frontend.
const auto& super_class = Class::Handle(Z, klass.SuperClass());
if (!super_class.IsNull() &&
super_class.UserVisibleName() == Symbols::AbiSpecificInteger().ptr() &&
Library::Handle(Z, super_class.library()).url() ==
Symbols::DartFfi().ptr()) {
const char* error = nullptr;
compiler::ffi::NativeType::FromAbstractType(
Z, AbstractType::Handle(Z, klass.DeclarationType()), &error);
if (error != nullptr) {
H.ReportError("%s", error);
}
}
// Due to ReadVMAnnotations(), the klass may have been loaded at this point
// (loading the class while evaluating annotations).
if (klass.is_loaded()) {
return;
}
klass.SetFields(Array::Handle(Z, MakeFieldsArray()));
}
class_helper->ReadUntilExcluding(ClassHelper::kConstructors);
int constructor_count = helper_.ReadListLength(); // read list length.
for (intptr_t i = 0; i < constructor_count; ++i) {
intptr_t constructor_offset = helper_.ReaderOffset() - correction_offset_;
ActiveMemberScope active_member_scope(&active_class_, NULL);
ConstructorHelper constructor_helper(&helper_);
constructor_helper.ReadUntilExcluding(ConstructorHelper::kAnnotations);
intptr_t annotation_count = helper_.ReadListLength();
bool scan_annotations_lazy;
bool has_pragma_annotation;
bool is_invisible_function;
ReadVMAnnotations(library, annotation_count, /*native_name=*/nullptr,
&scan_annotations_lazy, &is_invisible_function,
&has_pragma_annotation);
constructor_helper.SetJustRead(ConstructorHelper::kAnnotations);
constructor_helper.ReadUntilExcluding(ConstructorHelper::kFunction);
const String& name =
H.DartConstructorName(constructor_helper.canonical_name_);
// We can have synthetic constructors, which will not have a source uri
// attached to them (which means the index into the source uri table is 0,
// see `package:kernel/binary/ast_to_binary::writeUriReference`.
const Object* owner = &klass;
const intptr_t source_uri_index = constructor_helper.source_uri_index_;
if (source_uri_index != 0) {
owner = &ClassForScriptAt(klass, source_uri_index);
}
FunctionType& signature = FunctionType::Handle(Z, FunctionType::New());
const Function& function = Function::ZoneHandle(
Z, Function::New(signature, name, UntaggedFunction::kConstructor,
false, // is_static
constructor_helper.IsConst(),
false, // is_abstract
constructor_helper.IsExternal(),
false, // is_native
*owner, constructor_helper.start_position_));
function.set_end_token_pos(constructor_helper.end_position_);
function.set_kernel_offset(constructor_offset);
signature.set_result_type(T.ReceiverType(klass));
function.set_has_pragma(has_pragma_annotation);
function.set_is_visible(!is_invisible_function);
if (scan_annotations_lazy) {
// Cannot be processed right now, so put on "pending" list.
EnsureAnnotationList();
annotation_list_.Add(function);
}
FunctionNodeHelper function_node_helper(&helper_);
function_node_helper.ReadUntilExcluding(
FunctionNodeHelper::kTypeParameters);
T.SetupFunctionParameters(klass, function,
true, // is_method
false, // is_closure
&function_node_helper);
T.SetupUnboxingInfoMetadata(function, library_kernel_offset_);
if (library.is_dart_scheme() &&
H.IsPrivate(constructor_helper.canonical_name_)) {
function.set_is_reflectable(false);
}
if (constructor_helper.IsSynthetic()) {
function.set_is_debuggable(false);
}
function_node_helper.ReadUntilExcluding(FunctionNodeHelper::kEnd);
constructor_helper.SetJustRead(ConstructorHelper::kFunction);
constructor_helper.ReadUntilExcluding(ConstructorHelper::kEnd);
if (klass.is_finalized()) {
// The owner class has already been marked as finalized (e.g. class
// 'NativeFieldWrapperClass1'), so the signature of this added constructor
// must be finalized here, since finalization of member types will not be
// called anymore.
signature ^= ClassFinalizer::FinalizeType(signature);
function.SetSignature(signature);
}
functions_.Add(&function);
if ((FLAG_enable_mirrors || has_pragma_annotation) &&
annotation_count > 0) {
library.AddMetadata(function, constructor_offset);
}
}
// Due to ReadVMAnnotations(), the klass may have been loaded at this point
// (loading the class while evaluating annotations).
if (klass.is_loaded()) {
return;
}
// Everything up til the procedures are skipped implicitly, and class_helper
// is no longer used.
intptr_t procedure_count = class_index.procedure_count();
// Procedure offsets within a class index are whole program offsets and not
// relative to the library of the class. Hence, we need a correction to get
// the currect procedure offset within the current data.
intptr_t correction = correction_offset_ - library_kernel_offset_;
intptr_t next_procedure_offset = class_index.ProcedureOffset(0) + correction;
for (intptr_t i = 0; i < procedure_count; ++i) {
helper_.SetOffset(next_procedure_offset);
next_procedure_offset = class_index.ProcedureOffset(i + 1) + correction;
LoadProcedure(library, klass, true, next_procedure_offset);
// LoadProcedure calls Library::GetMetadata which invokes Dart code
// which may recursively trigger class finalization and FinishClassLoading.
// In such case, return immediately and avoid overwriting already finalized
// functions with freshly loaded and not yet finalized.
if (klass.is_loaded()) {
return;
}
}
klass.SetFunctions(Array::Handle(MakeFunctionsArray()));
ASSERT(!klass.is_loaded());
klass.set_is_loaded(true);
}
void KernelLoader::FinishLoading(const Class& klass) {
ASSERT(klass.IsTopLevel() || (klass.kernel_offset() > 0));
Zone* zone = Thread::Current()->zone();
const Script& script = Script::Handle(zone, klass.script());
const Library& library = Library::Handle(zone, klass.library());
const Class& toplevel_class = Class::Handle(zone, library.toplevel_class());
const ExternalTypedData& library_kernel_data =
ExternalTypedData::Handle(zone, library.kernel_data());
ASSERT(!library_kernel_data.IsNull());
const intptr_t library_kernel_offset = library.kernel_offset();
ASSERT(library_kernel_offset > 0);
const KernelProgramInfo& info =
KernelProgramInfo::Handle(zone, script.kernel_program_info());
KernelLoader kernel_loader(script, library_kernel_data, library_kernel_offset,
info.kernel_binary_version());
LibraryIndex library_index(library_kernel_data, info.kernel_binary_version());
if (klass.IsTopLevel()) {
ASSERT(klass.ptr() == toplevel_class.ptr());
kernel_loader.FinishTopLevelClassLoading(klass, library, library_index);
return;
}
const intptr_t class_offset = klass.kernel_offset();
ClassIndex class_index(
library_kernel_data, class_offset,
// Class offsets in library index are whole program offsets.
// Hence, we need to add |library_kernel_offset| to
// |class_offset| to lookup the entry for the class in the library
// index.
library_index.SizeOfClassAtOffset(class_offset + library_kernel_offset));
kernel_loader.helper_.SetOffset(class_offset);
ClassHelper class_helper(&kernel_loader.helper_);
kernel_loader.FinishClassLoading(klass, library, toplevel_class, class_offset,
class_index, &class_helper);
}
// Read annotations on a procedure to identify potential VM-specific directives.
//
// Output parameters:
//
// `has_annotations_of_interest`: true if there may be annotations of
// interest and we need to re-try after reading the constants table.
//
// `is_invisible_function`: if `@pragma('vm:invisible)` was found.
//
// `native_name`: set if `@ExternalName(...)` / @pragma('vm:external-name)`
// was identified.
//
// `has_pragma_annotation`: if `@pragma(...)` was found (no information
// is given on the kind of pragma directive).
//
void KernelLoader::ReadVMAnnotations(const Library& library,
intptr_t annotation_count,
String* native_name,
bool* has_annotations_of_interest,
bool* is_invisible_function,
bool* has_pragma_annotation) {
if (has_annotations_of_interest != nullptr) {
*has_annotations_of_interest = false;
}
if (is_invisible_function != nullptr) {
*is_invisible_function = false;
}
*has_pragma_annotation = false;
if (annotation_count == 0) {
return;
}
const Array& constant_table_array =
Array::Handle(Z, kernel_program_info_.constants());
const bool have_read_constant_table = !constant_table_array.IsNull();
Instance& constant = Instance::Handle(Z);
String& pragma_name = String::Handle(Z);
Object& pragma_options = Object::Handle(Z);
for (intptr_t i = 0; i < annotation_count; ++i) {
const intptr_t tag = helper_.PeekTag();
if (tag == kConstantExpression) {
if (!have_read_constant_table) {
// We can only read in the constant table once all classes have been
// finalized (otherwise we can't create instances of the classes!).
//
// We therefore delay the scanning for `ExternalName {name: ... }`
// constants in the annotation list to later.
if (has_annotations_of_interest != nullptr) {
*has_annotations_of_interest = true;
}
ASSERT(kernel_program_info_.constants_table() !=
ExternalTypedData::null());
// For pragma annotations, we seek into the constants table and peek
// into the Kernel representation of the constant.
//
// TODO(sjindel): Refactor `ExternalName` handling to do this as well
// and avoid the "potential natives" list.
helper_.ReadByte(); // Skip the tag.
helper_.ReadPosition(); // Skip fileOffset.
helper_.SkipDartType(); // Skip type.
const intptr_t index_in_constant_table = helper_.ReadUInt();
AlternativeReadingScopeWithNewData scope(
&helper_.reader_,
&ExternalTypedData::Handle(Z,
kernel_program_info_.constants_table()),
0);
// Seek into the position within the constant table where we can inspect
// this constant's Kernel representation.
// Get the length of the constants (at the end of the mapping).
helper_.SetOffset(helper_.ReaderSize() - 4);
const intptr_t num_constants = helper_.ReadUInt32();
// Get the binary offset of the constant at the wanted index.
helper_.SetOffset(helper_.ReaderSize() - 4 - (num_constants * 4) +
(index_in_constant_table * 4));
const intptr_t constant_offset = helper_.ReadUInt32();
helper_.SetOffset(constant_offset);
uint8_t tag = helper_.ReadTag();
if (tag == kInstanceConstant) {
*has_pragma_annotation =
*has_pragma_annotation ||
IsClassName(helper_.ReadCanonicalNameReference(),
Symbols::DartCore(), Symbols::Pragma());
}
} else {
// Prepare lazy constant reading.
const dart::Class& toplevel_class =
Class::Handle(Z, library.toplevel_class());
ActiveClassScope active_class_scope(&active_class_, &toplevel_class);
ConstantReader constant_reader(&helper_, &active_class_);
helper_.ReadByte(); // Skip the tag.
// Obtain `dart:_internal::ExternalName.name`.
EnsureExternalClassIsLookedUp();
// Obtain `dart:_internal::pragma`.
EnsurePragmaClassIsLookedUp();
if (tag == kConstantExpression) {
helper_.ReadPosition(); // Skip fileOffset.
helper_.SkipDartType(); // Skip type.
}
const intptr_t constant_table_index = helper_.ReadUInt();
// We have a candidate. Let's look if it's an instance of the
// ExternalName or Pragma class.
if (constant_reader.IsInstanceConstant(constant_table_index,
external_name_class_)) {
if (native_name != nullptr) {
constant = constant_reader.ReadConstant(constant_table_index);
ASSERT(constant.clazz() == external_name_class_.ptr());
*native_name ^= constant.GetField(external_name_field_);
}
} else if (constant_reader.IsInstanceConstant(constant_table_index,
pragma_class_)) {
*has_pragma_annotation = true;
if (native_name != nullptr || is_invisible_function != nullptr) {
constant = constant_reader.ReadConstant(constant_table_index);
ASSERT(constant.clazz() == pragma_class_.ptr());
pragma_name ^= constant.GetField(pragma_name_field_);
if (is_invisible_function != nullptr &&
pragma_name.ptr() == Symbols::vm_invisible().ptr()) {
*is_invisible_function = true;
}
if (native_name != nullptr &&
pragma_name.ptr() == Symbols::vm_external_name().ptr()) {
pragma_options = constant.GetField(pragma_options_field_);
if (pragma_options.IsString()) {
*native_name ^= pragma_options.ptr();
}
}
}
}
}
} else {
helper_.SkipExpression();
continue;
}
}
}
void KernelLoader::LoadProcedure(const Library& library,
const Class& owner,
bool in_class,
intptr_t procedure_end) {
intptr_t procedure_offset = helper_.ReaderOffset() - correction_offset_;
ProcedureHelper procedure_helper(&helper_);
procedure_helper.ReadUntilExcluding(ProcedureHelper::kAnnotations);
// CFE adds 'member signature' abstract functions to a legacy class deriving
// or implementing an opted-in interface. The signature of these functions is
// legacy erased and used as the target of interface calls. They are used for
// static reasoning about the program by CFE, but not really needed by the VM.
// In certain situations (e.g. issue 162073826), a large number of these
// additional functions can cause strain on the VM. They are therefore skipped
// in jit mode and their associated origin function is used instead as
// interface call target.
if (!FLAG_precompiled_mode && procedure_helper.IsMemberSignature()) {
helper_.SetOffset(procedure_end);
return;
}
const String& name = H.DartProcedureName(procedure_helper.canonical_name_);
bool is_method = in_class && !procedure_helper.IsStatic();
bool is_abstract = procedure_helper.IsAbstract();
bool is_external = procedure_helper.IsExternal();
bool is_extension_member = procedure_helper.IsExtensionMember();
String& native_name = String::Handle(Z);
bool scan_annotations_lazy;
bool has_pragma_annotation;
bool is_invisible_function;
const intptr_t annotation_count = helper_.ReadListLength();
ReadVMAnnotations(library, annotation_count, &native_name,
&scan_annotations_lazy, &is_invisible_function,
&has_pragma_annotation);
// If this is a potential native, we'll unset is_external in
// AnnotateProcedures instead.
is_external = is_external && native_name.IsNull();
procedure_helper.SetJustRead(ProcedureHelper::kAnnotations);
const Object& script_class =
ClassForScriptAt(owner, procedure_helper.source_uri_index_);
UntaggedFunction::Kind kind = GetFunctionType(procedure_helper.kind_);
// We do not register expression evaluation libraries with the VM:
// The expression evaluation functions should be GC-able as soon as
// they are not reachable anymore and we never look them up by name.
const bool register_function = !name.Equals(Symbols::DebugProcedureName());
const FunctionType& signature = FunctionType::Handle(Z, FunctionType::New());
const Function& function = Function::ZoneHandle(
Z, Function::New(signature, name, kind,
!is_method, // is_static
false, // is_const
is_abstract, is_external,
!native_name.IsNull(), // is_native
script_class, procedure_helper.start_position_));
function.set_has_pragma(has_pragma_annotation);
function.set_end_token_pos(procedure_helper.end_position_);
function.set_is_synthetic(procedure_helper.IsNoSuchMethodForwarder() ||
procedure_helper.IsMemberSignature());
function.set_is_visible(!is_invisible_function);
if (register_function) {
functions_.Add(&function);
} else {
H.SetExpressionEvaluationFunction(function);
}
function.set_kernel_offset(procedure_offset);
function.set_is_extension_member(is_extension_member);
function.set_is_redirecting_factory(procedure_helper.IsRedirectingFactory());
if ((library.is_dart_scheme() &&
H.IsPrivate(procedure_helper.canonical_name_)) ||
(function.is_static() && (library.ptr() == Library::InternalLibrary()))) {
function.set_is_reflectable(false);
}
if (procedure_helper.IsMemberSignature()) {
function.set_is_reflectable(false);
}
ActiveMemberScope active_member(&active_class_, &function);
procedure_helper.ReadUntilExcluding(ProcedureHelper::kFunction);
FunctionNodeHelper function_node_helper(&helper_);
function_node_helper.ReadUntilIncluding(FunctionNodeHelper::kDartAsyncMarker);
function.set_is_debuggable(function_node_helper.dart_async_marker_ ==
FunctionNodeHelper::kSync);
switch (function_node_helper.dart_async_marker_) {
case FunctionNodeHelper::kSyncStar:
function.set_modifier(UntaggedFunction::kSyncGen);
function.set_is_visible(!FLAG_lazy_async_stacks);
break;
case FunctionNodeHelper::kAsync:
function.set_modifier(UntaggedFunction::kAsync);
function.set_is_inlinable(!FLAG_lazy_async_stacks);
function.set_is_visible(!FLAG_lazy_async_stacks);
break;
case FunctionNodeHelper::kAsyncStar:
function.set_modifier(UntaggedFunction::kAsyncGen);
function.set_is_inlinable(!FLAG_lazy_async_stacks);
function.set_is_visible(!FLAG_lazy_async_stacks);
break;
default:
// no special modifier
break;
}
ASSERT(function_node_helper.async_marker_ == FunctionNodeHelper::kSync);
if (!native_name.IsNull()) {
function.set_native_name(native_name);
}
if (scan_annotations_lazy) {
// Cannot be processed right now, so put on "pending" list.
EnsureAnnotationList();
annotation_list_.Add(function);
}
function_node_helper.ReadUntilExcluding(FunctionNodeHelper::kTypeParameters);
T.SetupFunctionParameters(owner, function, is_method,
false, // is_closure
&function_node_helper);
T.SetupUnboxingInfoMetadata(function, library_kernel_offset_);
// Everything else is skipped implicitly, and procedure_helper and
// function_node_helper are no longer used.
helper_.SetOffset(procedure_end);
if (annotation_count > 0) {
library.AddMetadata(function, procedure_offset);
}
if (has_pragma_annotation) {
if (kernel_program_info_.constants() == Array::null()) {
// Any potential pragma function before point at which
// constant table could be loaded goes to "pending".
EnsurePotentialPragmaFunctions();
potential_pragma_functions_.Add(function);
} else {
library.GetMetadata(function);
}
}
}
const Object& KernelLoader::ClassForScriptAt(const Class& klass,
intptr_t source_uri_index) {
const Script& correct_script = Script::Handle(Z, ScriptAt(source_uri_index));
if (klass.script() != correct_script.ptr()) {
// Lazily create the [patch_classes_] array in case we need it.
if (patch_classes_.IsNull()) {
const Array& scripts = Array::Handle(Z, kernel_program_info_.scripts());
ASSERT(!scripts.IsNull());
patch_classes_ = Array::New(scripts.Length(), Heap::kOld);
}
// Use cache for patch classes. This works best for in-order usages.
PatchClass& patch_class = PatchClass::ZoneHandle(Z);
patch_class ^= patch_classes_.At(source_uri_index);
if (patch_class.IsNull() || patch_class.origin_class() != klass.ptr()) {
ASSERT(!library_kernel_data_.IsNull());
patch_class = PatchClass::New(klass, correct_script);
patch_class.set_library_kernel_data(library_kernel_data_);
patch_class.set_library_kernel_offset(library_kernel_offset_);
patch_classes_.SetAt(source_uri_index, patch_class);
}
return patch_class;
}
return klass;
}
ScriptPtr KernelLoader::LoadScriptAt(intptr_t index,
UriToSourceTable* uri_to_source_table) {
const String& uri_string = helper_.SourceTableUriFor(index);
const String& import_uri_string =
helper_.SourceTableImportUriFor(index, program_->binary_version());
#if !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
ExternalTypedData& constant_coverage =
ExternalTypedData::Handle(Z, helper_.GetConstantCoverageFor(index));
#endif // !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
String& sources = String::Handle(Z);
TypedData& line_starts = TypedData::Handle(Z);
if (uri_to_source_table != nullptr) {
UriToSourceTableEntry wrapper;
wrapper.uri = &uri_string;
UriToSourceTableEntry* pair = uri_to_source_table->LookupValue(&wrapper);
if (pair != nullptr) {
sources = pair->sources->ptr();
line_starts = pair->line_starts->ptr();
}
}
if (sources.IsNull() || line_starts.IsNull()) {
const String& script_source = helper_.GetSourceFor(index);
line_starts = helper_.GetLineStartsFor(index);
if (script_source.ptr() == Symbols::Empty().ptr() &&
line_starts.Length() == 0 && uri_string.Length() > 0) {
// Entry included only to provide URI - actual source should already exist
// in the VM, so try to find it.
Library& lib = Library::Handle(Z);
Script& script = Script::Handle(Z);
const GrowableObjectArray& libs =
GrowableObjectArray::Handle(IG->object_store()->libraries());
for (intptr_t i = 0; i < libs.Length(); i++) {
lib ^= libs.At(i);
script = lib.LookupScript(uri_string, /* useResolvedUri = */ true);
if (!script.IsNull()) {
sources = script.Source();
line_starts = script.line_starts();
break;
}
}
} else {
sources = script_source.ptr();
}
}
const Script& script =
Script::Handle(Z, Script::New(import_uri_string, uri_string, sources));
script.set_kernel_script_index(index);
script.set_kernel_program_info(kernel_program_info_);
script.set_line_starts(line_starts);
#if !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
script.set_constant_coverage(constant_coverage);
#endif // !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
script.set_debug_positions(Array::null_array());
return script.ptr();
}
ObjectPtr KernelLoader::GenerateFieldAccessors(const Class& klass,
const Field& field,
FieldHelper* field_helper) {
const Tag tag = helper_.PeekTag();
const bool has_initializer = (tag == kSomething);
if (has_initializer) {
SimpleExpressionConverter converter(&H, &helper_);
const bool has_simple_initializer =
converter.IsSimple(helper_.ReaderOffset() + 1); // ignore the tag.
if (has_simple_initializer) {
if (field_helper->IsStatic()) {
return converter.SimpleValue().ptr();
} else {
// Note: optimizer relies on DoubleInitialized bit in its field-unboxing
// heuristics. See JitCallSpecializer::VisitStoreInstanceField for more
// details.
field.RecordStore(converter.SimpleValue());
if (!converter.SimpleValue().IsNull() &&
converter.SimpleValue().IsDouble()) {
field.set_is_double_initialized(true);
}
}
}
}
if (field_helper->IsStatic()) {
if (!has_initializer && !field_helper->IsLate()) {
// Static fields without an initializer are implicitly initialized to
// null. We do not need a getter.
return Instance::null();
}
}
ASSERT(field.NeedsGetter());
const String& getter_name =
H.DartGetterName(field_helper->canonical_name_getter_);
const Object& script_class =
ClassForScriptAt(klass, field_helper->source_uri_index_);
const FunctionType& signature = FunctionType::Handle(Z, FunctionType::New());
Function& getter = Function::ZoneHandle(
Z,
Function::New(
signature, getter_name,
field_helper->IsStatic() ? UntaggedFunction::kImplicitStaticGetter
: UntaggedFunction::kImplicitGetter,
field_helper->IsStatic(),
// The functions created by the parser have is_const for static fields
// that are const (not just final) and they have is_const for
// non-static fields that are final.
field_helper->IsStatic() ? field_helper->IsConst()
: field_helper->IsFinal(),
false, // is_abstract
false, // is_external
false, // is_native
script_class, field_helper->position_));
functions_.Add(&getter);
getter.set_end_token_pos(field_helper->end_position_);
getter.set_kernel_offset(field.kernel_offset());
const AbstractType& field_type = AbstractType::Handle(Z, field.type());
signature.set_result_type(field_type);
getter.set_is_debuggable(false);
getter.set_accessor_field(field);
getter.set_is_extension_member(field.is_extension_member());
H.SetupFieldAccessorFunction(klass, getter, field_type);
T.SetupUnboxingInfoMetadataForFieldAccessors(getter, library_kernel_offset_);
if (field.NeedsSetter()) {
// Only static fields can be const.
ASSERT(!field_helper->IsConst());
const String& setter_name =
H.DartSetterName(field_helper->canonical_name_setter_);
const FunctionType& signature =
FunctionType::Handle(Z, FunctionType::New());
Function& setter = Function::ZoneHandle(
Z,
Function::New(signature, setter_name, UntaggedFunction::kImplicitSetter,
field_helper->IsStatic(),
false, // is_const
false, // is_abstract
false, // is_external
false, // is_native
script_class, field_helper->position_));
functions_.Add(&setter);
setter.set_end_token_pos(field_helper->end_position_);
setter.set_kernel_offset(field.kernel_offset());
signature.set_result_type(Object::void_type());
setter.set_is_debuggable(false);
setter.set_accessor_field(field);
setter.set_is_extension_member(field.is_extension_member());
H.SetupFieldAccessorFunction(klass, setter, field_type);
T.SetupUnboxingInfoMetadataForFieldAccessors(setter,
library_kernel_offset_);
}
// If static, we do need a getter that evaluates the initializer if necessary.
return field_helper->IsStatic() ? Object::sentinel().ptr() : Object::null();
}
LibraryPtr KernelLoader::LookupLibraryOrNull(NameIndex library) {
LibraryPtr result;
name_index_handle_ = Smi::New(library);
{
result = kernel_program_info_.LookupLibrary(thread_, name_index_handle_);
NoSafepointScope no_safepoint_scope(thread_);
if (result != Library::null()) {
return result;
}
}
const String& url = H.DartString(H.CanonicalNameString(library));
{
result = Library::LookupLibrary(thread_, url);
NoSafepointScope no_safepoint_scope(thread_);
if (result == Library::null()) {
return result;
}
}
const Library& handle = Library::Handle(Z, result);
name_index_handle_ = Smi::New(library);
return kernel_program_info_.InsertLibrary(thread_, name_index_handle_,
handle);
}
LibraryPtr KernelLoader::LookupLibrary(NameIndex library) {
name_index_handle_ = Smi::New(library);
{
LibraryPtr result =
kernel_program_info_.LookupLibrary(thread_, name_index_handle_);
NoSafepointScope no_safepoint_scope(thread_);
if (result != Library::null()) {
return result;
}
}
Library& handle = Library::Handle(Z);
const String& url = H.DartSymbolPlain(H.CanonicalNameString(library));
// We do not register expression evaluation libraries with the VM:
// The expression evaluation functions should be GC-able as soon as
// they are not reachable anymore and we never look them up by name.
if (url.Equals(Symbols::EvalSourceUri())) {
if (expression_evaluation_library_.IsNull()) {
handle = Library::New(url);
expression_evaluation_library_ = handle.ptr();
}
return expression_evaluation_library_.ptr();
}
handle = Library::LookupLibrary(thread_, url);
if (handle.IsNull()) {
handle = Library::New(url);
handle.Register(thread_);
}
ASSERT(!handle.IsNull());
name_index_handle_ = Smi::New(library);
return kernel_program_info_.InsertLibrary(thread_, name_index_handle_,
handle);
}
LibraryPtr KernelLoader::LookupLibraryFromClass(NameIndex klass) {
return LookupLibrary(H.CanonicalNameParent(klass));
}
ClassPtr KernelLoader::LookupClass(const Library& library, NameIndex klass) {
name_index_handle_ = Smi::New(klass);
{
ClassPtr raw_class =
kernel_program_info_.LookupClass(thread_, name_index_handle_);
NoSafepointScope no_safepoint_scope(thread_);
if (raw_class != Class::null()) {
return raw_class;
}
}
ASSERT(!library.IsNull());
const String& name = H.DartClassName(klass);
Class& handle = Class::Handle(Z, library.LookupLocalClass(name));
bool register_class = true;
if (handle.IsNull()) {
// We do not register expression evaluation classes with the VM:
// The expression evaluation functions should be GC-able as soon as
// they are not reachable anymore and we never look them up by name.
register_class = library.ptr() != expression_evaluation_library_.ptr();
handle = Class::New(library, name, Script::Handle(Z),
TokenPosition::kNoSource, register_class);
if (register_class) {
library.AddClass(handle);
}
}
ASSERT(!handle.IsNull());
if (register_class) {
name_index_handle_ = Smi::New(klass);
kernel_program_info_.InsertClass(thread_, name_index_handle_, handle);
}
return handle.ptr();
}
UntaggedFunction::Kind KernelLoader::GetFunctionType(
ProcedureHelper::Kind procedure_kind) {
intptr_t lookuptable[] = {
UntaggedFunction::kRegularFunction, // Procedure::kMethod
UntaggedFunction::kGetterFunction, // Procedure::kGetter
UntaggedFunction::kSetterFunction, // Procedure::kSetter
UntaggedFunction::kRegularFunction, // Procedure::kOperator
UntaggedFunction::kConstructor, // Procedure::kFactory
};
intptr_t kind = static_cast<int>(procedure_kind);
ASSERT(0 <= kind && kind <= ProcedureHelper::kFactory);
return static_cast<UntaggedFunction::Kind>(lookuptable[kind]);
}
FunctionPtr CreateFieldInitializerFunction(Thread* thread,
Zone* zone,
const Field& field) {
ASSERT(field.InitializerFunction() == Function::null());
String& init_name = String::Handle(zone, field.name());
init_name = Symbols::FromConcat(thread, Symbols::InitPrefix(), init_name);
// Static field initializers are not added as members of their owning class,
// so they must be pre-emptively given a patch class to avoid the meaning of
// their kernel/token position changing during a reload. Compare
// Class::PatchFieldsAndFunctions().
// This might also be necessary for lazy computation of local var descriptors.
// Compare https://codereview.chromium.org//1317753004
const Script& script = Script::Handle(zone, field.Script());
const Class& field_owner = Class::Handle(zone, field.Owner());
const PatchClass& initializer_owner =
PatchClass::Handle(zone, PatchClass::New(field_owner, script));
const Library& lib = Library::Handle(zone, field_owner.library());
initializer_owner.set_library_kernel_data(
ExternalTypedData::Handle(zone, lib.kernel_data()));
initializer_owner.set_library_kernel_offset(lib.kernel_offset());
// Create a static initializer.
FunctionType& signature = FunctionType::Handle(zone, FunctionType::New());
const Function& initializer_fun = Function::Handle(
zone,
Function::New(signature, init_name, UntaggedFunction::kFieldInitializer,
field.is_static(), // is_static
false, // is_const
false, // is_abstract
false, // is_external
false, // is_native
initializer_owner, TokenPosition::kNoSource));
if (!field.is_static()) {
signature.set_num_fixed_parameters(1);
signature.set_parameter_types(
Array::Handle(zone, Array::New(1, Heap::kOld)));
signature.SetParameterTypeAt(
0, AbstractType::Handle(zone, field_owner.DeclarationType()));
initializer_fun.CreateNameArray();
initializer_fun.SetParameterNameAt(0, Symbols::This());
}
signature.set_result_type(AbstractType::Handle(zone, field.type()));
initializer_fun.set_is_reflectable(false);
initializer_fun.set_is_inlinable(false);
initializer_fun.set_token_pos(field.token_pos());
initializer_fun.set_end_token_pos(field.end_token_pos());
initializer_fun.set_accessor_field(field);
initializer_fun.InheritKernelOffsetFrom(field);
initializer_fun.set_is_extension_member(field.is_extension_member());
signature ^= ClassFinalizer::FinalizeType(signature);
initializer_fun.SetSignature(signature);
field.SetInitializerFunction(initializer_fun);
return initializer_fun.ptr();
}
} // namespace kernel
} // namespace dart
#endif // !defined(DART_PRECOMPILED_RUNTIME)