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sdk/runtime/vm/kernel_loader.cc
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Alexander Markov 14f6276945 [Kernel, VM] Add null checking to devirtualization 
Devirtualization optimization now adds metadata to kernel AST instead
of transforming nodes to Direct* ones. The direct call metadata
provides information about checking receiver for null, while
Direct* kernel nodes do not support null checking.

VM's kernel binary loader is extended to extract arbitrary metadata
from kernel binaries and keep it for flow graph builder.
Kernel flow graph builder is extended to take direct call metadata
into account and generate CheckNull/StaticCall instructions
for devirtualized PropertyGet, PropertySet and MethodInvocation nodes.

Issue: https://github.com/dart-lang/sdk/issues/30480
Change-Id: I57f56fbf4a8981d33b1571c0d93105cf8ca71d76
Reviewed-on: https://dart-review.googlesource.com/12260
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
2017-10-10 00:50:31 +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_loader.h"
#include <string.h>
#include "vm/compiler/frontend/kernel_binary_flowgraph.h"
#include "vm/compiler/frontend/kernel_to_il.h"
#include "vm/dart_api_impl.h"
#include "vm/kernel_binary.h"
#include "vm/longjump.h"
#include "vm/object_store.h"
#include "vm/parser.h"
#include "vm/symbols.h"
#if !defined(DART_PRECOMPILED_RUNTIME)
namespace dart {
namespace kernel {
#define Z (zone_)
#define I (isolate_)
#define T (builder_.type_translator_)
#define H (translation_helper_)
class SimpleExpressionConverter {
public:
SimpleExpressionConverter(TranslationHelper* helper,
StreamingFlowGraphBuilder* builder)
: translation_helper_(*helper),
zone_(translation_helper_.zone()),
simple_value_(NULL),
builder_(builder) {}
bool IsSimple(intptr_t kernel_offset) {
AlternativeReadingScope alt(builder_->reader_, kernel_offset);
uint8_t payload = 0;
Tag tag = builder_->ReadTag(&payload); // read tag.
switch (tag) {
case kBigIntLiteral: {
const String& literal_str =
H.DartString(builder_->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.DartSymbol(
builder_->ReadStringReference()); // read index into string table.
return true;
case kSpecialIntLiteral:
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>(builder_->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>(builder_->ReadUInt()),
Heap::kOld)); // read value.
*simple_value_ = H.Canonicalize(*simple_value_);
return true;
case kDoubleLiteral:
simple_value_ = &Double::ZoneHandle(
Z, Double::New(H.DartString(builder_->ReadStringReference()),
Heap::kOld)); // read string reference.
*simple_value_ = H.Canonicalize(*simple_value_);
return true;
case kTrueLiteral:
simple_value_ = &Bool::Handle(Z, Bool::Get(true).raw());
return true;
case kFalseLiteral:
simple_value_ = &Bool::Handle(Z, Bool::Get(false).raw());
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_;
StreamingFlowGraphBuilder* builder_;
};
RawArray* 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.raw();
}
RawLibrary* BuildingTranslationHelper::LookupLibraryByKernelLibrary(
NameIndex library) {
return loader_->LookupLibrary(library).raw();
}
RawClass* BuildingTranslationHelper::LookupClassByKernelClass(NameIndex klass) {
return loader_->LookupClass(klass).raw();
}
KernelLoader::KernelLoader(Program* program)
: program_(program),
thread_(Thread::Current()),
zone_(thread_->zone()),
isolate_(thread_->isolate()),
scripts_(Array::ZoneHandle(zone_)),
patch_classes_(Array::ZoneHandle(zone_)),
library_kernel_offset_(-1),
library_kernel_data_(TypedData::ZoneHandle(zone_)),
translation_helper_(this, thread_),
builder_(&translation_helper_,
zone_,
program_->kernel_data(),
program_->kernel_data_size(),
0) {
T.active_class_ = &active_class_;
T.finalize_ = false;
scripts_ = Array::New(builder_.SourceTableSize(), Heap::kOld);
patch_classes_ = Array::New(builder_.SourceTableSize(), 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->kernel_data(), program->kernel_data_size());
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);
}
// Copy the string data out of the binary and into the VM's heap.
TypedData& data = TypedData::Handle(
Z, TypedData::New(kTypedDataUint8ArrayCid, end_offset, Heap::kOld));
reader.CopyDataToVMHeap(data, reader.offset(), end_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());
}
// Metadata mappings immediately follow names table.
const intptr_t metadata_mappings_start = reader.offset();
// Copy metadata payloads into the VM's heap
// TODO(alexmarkov): add more info to program index instead of guessing
// the end of metadata payloads by offsets of the libraries.
intptr_t metadata_payloads_end = program->source_table_offset();
for (intptr_t i = 0; i < program->library_count(); ++i) {
metadata_payloads_end =
Utils::Minimum(metadata_payloads_end, library_offset(i));
}
ASSERT(metadata_payloads_end >= MetadataPayloadOffset);
const intptr_t metadata_payloads_size =
metadata_payloads_end - MetadataPayloadOffset;
TypedData& metadata_payloads =
TypedData::Handle(Z, TypedData::New(kTypedDataUint8ArrayCid,
metadata_payloads_size, Heap::kOld));
reader.CopyDataToVMHeap(metadata_payloads, MetadataPayloadOffset,
metadata_payloads_size);
// Copy metadata mappings into the VM's heap
const intptr_t metadata_mappings_size =
program->string_table_offset() - metadata_mappings_start;
TypedData& metadata_mappings =
TypedData::Handle(Z, TypedData::New(kTypedDataUint8ArrayCid,
metadata_mappings_size, Heap::kOld));
reader.CopyDataToVMHeap(metadata_mappings, metadata_mappings_start,
metadata_mappings_size);
H.SetStringOffsets(offsets);
H.SetStringData(data);
H.SetCanonicalNames(names);
H.SetMetadataPayloads(metadata_payloads);
H.SetMetadataMappings(metadata_mappings);
}
Object& KernelLoader::LoadProgram() {
LongJumpScope jump;
if (setjmp(*jump.Set()) == 0) {
intptr_t length = program_->library_count();
for (intptr_t i = 0; i < length; i++) {
LoadLibrary(i);
}
for (intptr_t i = 0; i < length; i++) {
Library& library = LookupLibrary(library_canonical_name(i));
if (!library.Loaded()) library.SetLoaded();
}
if (ClassFinalizer::ProcessPendingClasses(/*from_kernel=*/true)) {
// If 'main' is not found return a null library, this is the case
// when bootstrapping is in progress.
NameIndex main = program_->main_method();
if (main == -1) {
return Library::Handle(Z);
}
NameIndex main_library = H.EnclosingName(main);
Library& library = LookupLibrary(main_library);
// Sanity check that we can find the main entrypoint.
ASSERT(library.LookupObjectAllowPrivate(H.DartSymbol("main")) !=
Object::null());
return library;
}
}
// Either class finalization failed or we caught a compile error.
// In both cases sticky error would be set.
Error& error = Error::Handle(Z);
error = thread_->sticky_error();
thread_->clear_sticky_error();
return error;
}
void KernelLoader::FindModifiedLibraries(Isolate* isolate,
BitVector* modified_libs,
bool force_reload) {
LongJumpScope jump;
if (setjmp(*jump.Set()) == 0) {
if (force_reload) {
// If a reload is being forced we mark all libraries as having
// been modified.
const GrowableObjectArray& libs =
GrowableObjectArray::Handle(isolate->object_store()->libraries());
intptr_t num_libs = libs.Length();
Library& lib = dart::Library::Handle(Z);
for (intptr_t i = 0; i < num_libs; i++) {
lib ^= libs.At(i);
if (!lib.is_dart_scheme()) {
modified_libs->Add(lib.index());
}
}
return;
}
// Now go through all the libraries that are present in the incremental
// kernel files, these will constitute the modified libraries.
intptr_t length = program_->library_count();
for (intptr_t i = 0; i < length; i++) {
intptr_t kernel_offset = library_offset(i);
builder_.SetOffset(kernel_offset);
LibraryHelper library_helper(&builder_);
library_helper.ReadUntilIncluding(LibraryHelper::kCanonicalName);
dart::Library& lib = LookupLibrary(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());
}
}
}
}
void KernelLoader::LoadLibrary(intptr_t index) {
// Read library index.
library_kernel_offset_ = library_offset(index);
intptr_t library_end = library_offset(index + 1);
intptr_t library_size = library_end - library_kernel_offset_;
intptr_t procedure_count =
builder_.reader_->ReadFromIndex(library_end, 0, 1, 0);
intptr_t procedure_list_size = procedure_count + 1;
intptr_t class_count = builder_.reader_->ReadFromIndex(
library_end, 1 + procedure_list_size, 1, 0);
intptr_t class_list_size = class_count + 1;
// NOTE: Since |builder_| 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.
builder_.SetOffset(library_kernel_offset_);
LibraryHelper library_helper(&builder_);
library_helper.ReadUntilIncluding(LibraryHelper::kCanonicalName);
Library& library = LookupLibrary(library_helper.canonical_name_);
// The Kernel library is external implies that it is already loaded.
ASSERT(!library_helper.IsExternal() || library.Loaded());
if (library.Loaded()) return;
library_kernel_data_ =
TypedData::New(kTypedDataUint8ArrayCid, library_size, Heap::kOld);
builder_.reader_->CopyDataToVMHeap(library_kernel_data_,
library_kernel_offset_, library_size);
library.set_kernel_data(library_kernel_data_);
library.set_kernel_offset(library_kernel_offset_);
library_helper.ReadUntilIncluding(LibraryHelper::kName);
library.SetName(H.DartSymbol(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).raw()) {
ASSERT(library.LoadInProgress());
} else {
library.SetLoadInProgress();
}
StringIndex import_uri_index =
H.CanonicalNameString(library_helper.canonical_name_);
library_helper.ReadUntilIncluding(LibraryHelper::kSourceUriIndex);
Script& script = ScriptAt(library_helper.source_uri_index_, import_uri_index);
library_helper.ReadUntilExcluding(LibraryHelper::kDependencies);
LoadLibraryImportsAndExports(&library);
library_helper.SetJustRead(LibraryHelper::kDependencies);
// Setup toplevel class (which contains library fields/procedures).
Class& toplevel_class =
Class::Handle(Z, Class::New(library, Symbols::TopLevel(), script,
TokenPosition::kNoSource));
toplevel_class.set_is_cycle_free();
library.set_toplevel_class(toplevel_class);
const GrowableObjectArray& classes =
GrowableObjectArray::Handle(Z, I->object_store()->pending_classes());
// Everything up til the classes are skipped implicitly, and library_helper
// is no longer used.
// Load all classes.
intptr_t next_class_offset = builder_.reader_->ReadFromIndex(
library_end, 1 + procedure_list_size + 1, class_list_size, 0);
for (intptr_t i = 0; i < class_count; ++i) {
builder_.SetOffset(next_class_offset);
next_class_offset = builder_.reader_->ReadFromIndex(
library_end, 1 + procedure_list_size + 1, class_list_size, i + 1);
classes.Add(LoadClass(library, toplevel_class, next_class_offset),
Heap::kOld);
}
builder_.SetOffset(next_class_offset);
fields_.Clear();
functions_.Clear();
ActiveClassScope active_class_scope(&active_class_, &toplevel_class);
// Load toplevel fields.
intptr_t field_count = builder_.ReadListLength(); // read list length.
for (intptr_t i = 0; i < field_count; ++i) {
intptr_t field_offset = builder_.ReaderOffset() - library_kernel_offset_;
ActiveMemberScope active_member_scope(&active_class_, NULL);
FieldHelper field_helper(&builder_);
field_helper.ReadUntilExcluding(FieldHelper::kName);
const String& name = builder_.ReadNameAsFieldName();
field_helper.SetJustRead(FieldHelper::kName);
field_helper.ReadUntilExcluding(FieldHelper::kType);
const Object& script_class =
ClassForScriptAt(toplevel_class, field_helper.source_uri_index_);
Field& field = Field::Handle(
Z, Field::NewTopLevel(name, field_helper.IsFinal(),
field_helper.IsConst(), script_class,
field_helper.position_, field_helper.position_));
field.set_kernel_offset(field_offset);
const AbstractType& type = T.BuildType(); // read type.
field.SetFieldType(type);
field_helper.SetJustRead(FieldHelper::kType);
field_helper.ReadUntilExcluding(FieldHelper::kInitializer);
intptr_t field_initializer_offset = builder_.ReaderOffset();
field.set_has_initializer(builder_.PeekTag() == kSomething);
field_helper.ReadUntilExcluding(FieldHelper::kEnd);
{
// GenerateFieldAccessors reads (some of) the initializer.
AlternativeReadingScope alt(builder_.reader_, field_initializer_offset);
GenerateFieldAccessors(toplevel_class, field, &field_helper);
}
if (FLAG_enable_mirrors && field_helper.annotation_count_ > 0) {
library.AddFieldMetadata(field, TokenPosition::kNoSource, field_offset);
}
fields_.Add(&field);
library.AddObject(field, name);
}
toplevel_class.AddFields(fields_);
// Load toplevel procedures.
intptr_t next_procedure_offset =
builder_.reader_->ReadFromIndex(library_end, 1, procedure_list_size, 0);
for (intptr_t i = 0; i < procedure_count; ++i) {
builder_.SetOffset(next_procedure_offset);
next_procedure_offset = builder_.reader_->ReadFromIndex(
library_end, 1, procedure_list_size, i + 1);
LoadProcedure(library, toplevel_class, false, next_procedure_offset);
}
toplevel_class.SetFunctions(Array::Handle(MakeFunctionsArray()));
classes.Add(toplevel_class, Heap::kOld);
}
void KernelLoader::LoadLibraryImportsAndExports(Library* library) {
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 = builder_.ReadListLength();
for (intptr_t dep = 0; dep < deps_count; ++dep) {
LibraryDependencyHelper dependency_helper(&builder_);
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 = builder_.ReadListLength();
for (intptr_t c = 0; c < combinator_count; ++c) {
builder_.SkipLibraryCombinator();
}
continue;
}
// Prepare show and hide lists.
show_list = GrowableObjectArray::New(Heap::kOld);
hide_list = GrowableObjectArray::New(Heap::kOld);
const intptr_t combinator_count = builder_.ReadListLength();
for (intptr_t c = 0; c < combinator_count; ++c) {
uint8_t flags = builder_.ReadFlags();
intptr_t name_count = builder_.ReadListLength();
for (intptr_t n = 0; n < name_count; ++n) {
String& show_hide_name = H.DartSymbol(builder_.ReadStringReference());
if (flags & LibraryDependencyHelper::Show) {
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 =
LookupLibrary(dependency_helper.target_library_canonical_name_);
String& prefix = H.DartSymbol(dependency_helper.name_index_);
ns = Namespace::New(target_library, show_names, hide_names);
if (dependency_helper.flags_ & LibraryDependencyHelper::Export) {
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,
*library);
library->AddObject(library_prefix, prefix);
}
}
}
}
}
void KernelLoader::LoadPreliminaryClass(Class* klass,
ClassHelper* class_helper,
intptr_t type_parameter_count) {
// 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.
LoadAndSetupTypeParameters(*klass, type_parameter_count, *klass,
Function::Handle(Z));
// Set super type. Some classes (e.g., Object) do not have one.
Tag type_tag = builder_.ReadTag(); // read super class type (part 1).
if (type_tag == kSomething) {
AbstractType& super_type =
T.BuildTypeWithoutFinalization(); // read super class type (part 2).
if (super_type.IsMalformed()) H.ReportError("Malformed super type");
klass->set_super_type(super_type);
}
class_helper->SetJustRead(ClassHelper::kSuperClass);
class_helper->ReadUntilIncluding(ClassHelper::kMixinType);
// Build implemented interface types
intptr_t interface_count = builder_.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.
if (type.IsMalformed()) H.ReportError("Malformed interface type.");
interfaces.SetAt(i, type);
}
class_helper->SetJustRead(ClassHelper::kImplementedClasses);
klass->set_interfaces(interfaces);
if (class_helper->is_abstract_) klass->set_is_abstract();
}
Class& KernelLoader::LoadClass(const Library& library,
const Class& toplevel_class,
intptr_t class_end) {
intptr_t class_offset = builder_.ReaderOffset();
// Read part of class index.
intptr_t procedure_count =
builder_.reader_->ReadFromIndex(class_end, 0, 1, 0);
ClassHelper class_helper(&builder_);
class_helper.ReadUntilIncluding(ClassHelper::kCanonicalName);
Class& klass = LookupClass(class_helper.canonical_name_);
// 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 (klass.script() == Script::null()) {
class_helper.ReadUntilIncluding(ClassHelper::kSourceUriIndex);
Script& script = ScriptAt(class_helper.source_uri_index_);
klass.set_script(script);
}
if (klass.token_pos() == TokenPosition::kNoSource) {
class_helper.ReadUntilIncluding(ClassHelper::kPosition);
klass.set_token_pos(class_helper.position_);
}
class_helper.ReadUntilIncluding(ClassHelper::kAnnotations);
class_helper.ReadUntilExcluding(ClassHelper::kTypeParameters);
intptr_t type_parameter_counts =
builder_.ReadListLength(); // read type_parameters list length.
ActiveClassScope active_class_scope(&active_class_, &klass);
if (!klass.is_cycle_free()) {
LoadPreliminaryClass(&klass, &class_helper, type_parameter_counts);
} else {
for (intptr_t i = 0; i < type_parameter_counts; ++i) {
builder_.SkipStringReference(); // read ith name index.
builder_.SkipDartType(); // read ith bound.
}
class_helper.SetJustRead(ClassHelper::kTypeParameters);
}
fields_.Clear();
functions_.Clear();
if (library.raw() == Library::InternalLibrary() &&
klass.Name() == Symbols::ClassID().raw()) {
// If this is a dart:internal.ClassID class ignore field declarations
// contained in the Kernel file and instead inject our own const
// fields.
klass.InjectCIDFields();
} else {
class_helper.ReadUntilExcluding(ClassHelper::kFields);
int field_count = builder_.ReadListLength(); // read list length.
for (intptr_t i = 0; i < field_count; ++i) {
intptr_t field_offset = builder_.ReaderOffset() - library_kernel_offset_;
ActiveMemberScope active_member(&active_class_, NULL);
FieldHelper field_helper(&builder_);
field_helper.ReadUntilExcluding(FieldHelper::kName);
const String& name = builder_.ReadNameAsFieldName();
field_helper.SetJustRead(FieldHelper::kName);
field_helper.ReadUntilExcluding(FieldHelper::kType);
const AbstractType& type =
T.BuildTypeWithoutFinalization(); // read type.
field_helper.SetJustRead(FieldHelper::kType);
const Object& script_class =
ClassForScriptAt(klass, field_helper.source_uri_index_);
const bool is_reflectable =
field_helper.position_.IsReal() &&
!(library.is_dart_scheme() && library.IsPrivate(name));
Field& field = Field::Handle(
Z, Field::New(name, field_helper.IsStatic(),
// In the VM all const fields are implicitly final
// whereas in Kernel they are not final because they
// are not explicitly declared that way.
field_helper.IsFinal() || field_helper.IsConst(),
field_helper.IsConst(), is_reflectable, script_class,
type, field_helper.position_, field_helper.position_));
field.set_kernel_offset(field_offset);
field_helper.ReadUntilExcluding(FieldHelper::kInitializer);
intptr_t field_initializer_offset = builder_.ReaderOffset();
field.set_has_initializer(builder_.PeekTag() == kSomething);
field_helper.ReadUntilExcluding(FieldHelper::kEnd);
{
// GenerateFieldAccessors reads (some of) the initializer.
AlternativeReadingScope alt(builder_.reader_, field_initializer_offset);
GenerateFieldAccessors(klass, field, &field_helper);
}
if (FLAG_enable_mirrors && field_helper.annotation_count_ > 0) {
library.AddFieldMetadata(field, TokenPosition::kNoSource, field_offset);
}
fields_.Add(&field);
}
klass.AddFields(fields_);
class_helper.SetJustRead(ClassHelper::kFields);
}
class_helper.ReadUntilExcluding(ClassHelper::kConstructors);
int constructor_count = builder_.ReadListLength(); // read list length.
for (intptr_t i = 0; i < constructor_count; ++i) {
intptr_t constructor_offset =
builder_.ReaderOffset() - library_kernel_offset_;
ActiveMemberScope active_member_scope(&active_class_, NULL);
ConstructorHelper constructor_helper(&builder_);
constructor_helper.ReadUntilExcluding(ConstructorHelper::kFunction);
const String& name =
H.DartConstructorName(constructor_helper.canonical_name_);
Function& function = Function::ZoneHandle(
Z, Function::New(name, RawFunction::kConstructor,
false, // is_static
constructor_helper.IsConst(),
false, // is_abstract
constructor_helper.IsExternal(),
false, // is_native
klass, constructor_helper.position_));
function.set_end_token_pos(constructor_helper.end_position_);
functions_.Add(&function);
function.set_kernel_offset(constructor_offset);
function.set_result_type(T.ReceiverType(klass));
FunctionNodeHelper function_node_helper(&builder_);
function_node_helper.ReadUntilExcluding(
FunctionNodeHelper::kRequiredParameterCount);
builder_.SetupFunctionParameters(klass, function,
true, // is_method
false, // is_closure
&function_node_helper);
function_node_helper.ReadUntilExcluding(FunctionNodeHelper::kEnd);
constructor_helper.SetJustRead(ConstructorHelper::kFunction);
constructor_helper.ReadUntilExcluding(ConstructorHelper::kEnd);
if (FLAG_enable_mirrors && constructor_helper.annotation_count_ > 0) {
library.AddFunctionMetadata(function, TokenPosition::kNoSource,
constructor_offset);
}
}
// Everything up til the procedures are skipped implicitly, and class_helper
// is no longer used.
intptr_t next_procedure_offset =
builder_.reader_->ReadFromIndex(class_end, 1, procedure_count + 1, 0);
for (intptr_t i = 0; i < procedure_count; ++i) {
builder_.SetOffset(next_procedure_offset);
next_procedure_offset = builder_.reader_->ReadFromIndex(
class_end, 1, procedure_count + 1, i + 1);
LoadProcedure(library, klass, true, next_procedure_offset);
}
klass.SetFunctions(Array::Handle(MakeFunctionsArray()));
if (!klass.is_marked_for_parsing()) {
klass.set_is_marked_for_parsing();
}
if (FLAG_enable_mirrors && class_helper.annotation_count_ > 0) {
library.AddClassMetadata(klass, toplevel_class, TokenPosition::kNoSource,
class_offset - library_kernel_offset_);
}
builder_.SetOffset(class_end);
return klass;
}
void KernelLoader::LoadProcedure(const Library& library,
const Class& owner,
bool in_class,
intptr_t procedure_end) {
intptr_t procedure_offset = builder_.ReaderOffset() - library_kernel_offset_;
ProcedureHelper procedure_helper(&builder_);
procedure_helper.ReadUntilExcluding(ProcedureHelper::kAnnotations);
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();
String* native_name = NULL;
intptr_t annotation_count;
if (is_external) {
// Maybe it has a native implementation, which is not external as far as
// the VM is concerned because it does have an implementation. Check for
// an ExternalName annotation and extract the string from it.
annotation_count = builder_.ReadListLength(); // read list length.
for (int i = 0; i < annotation_count; ++i) {
if (builder_.PeekTag() != kConstructorInvocation &&
builder_.PeekTag() != kConstConstructorInvocation) {
builder_.SkipExpression();
continue;
}
builder_.ReadTag();
builder_.ReadPosition();
NameIndex annotation_class = H.EnclosingName(
builder_.ReadCanonicalNameReference()); // read target reference,
ASSERT(H.IsClass(annotation_class));
StringIndex class_name_index = H.CanonicalNameString(annotation_class);
// Just compare by name, do not generate the annotation class.
if (!H.StringEquals(class_name_index, "ExternalName")) {
builder_.SkipArguments();
continue;
}
ASSERT(H.IsLibrary(H.CanonicalNameParent(annotation_class)));
StringIndex library_name_index =
H.CanonicalNameString(H.CanonicalNameParent(annotation_class));
if (!H.StringEquals(library_name_index, "dart:_internal")) {
builder_.SkipArguments();
continue;
}
is_external = false;
// Read arguments:
intptr_t total_arguments = builder_.ReadUInt(); // read argument count.
builder_.SkipListOfDartTypes(); // read list of types.
intptr_t positional_arguments = builder_.ReadListLength();
ASSERT(total_arguments == 1 && positional_arguments == 1);
Tag tag = builder_.ReadTag();
ASSERT(tag == kStringLiteral);
native_name = &H.DartSymbol(
builder_.ReadStringReference()); // read index into string table.
// List of named.
intptr_t list_length = builder_.ReadListLength(); // read list length.
ASSERT(list_length == 0);
// Skip remaining annotations
for (++i; i < annotation_count; ++i) {
builder_.SkipExpression(); // read ith annotation.
}
break;
}
procedure_helper.SetJustRead(ProcedureHelper::kAnnotations);
} else {
procedure_helper.ReadUntilIncluding(ProcedureHelper::kAnnotations);
annotation_count = procedure_helper.annotation_count_;
}
const Object& script_class =
ClassForScriptAt(owner, procedure_helper.source_uri_index_);
Function& function = Function::ZoneHandle(
Z, Function::New(name, GetFunctionType(procedure_helper.kind_),
!is_method, // is_static
false, // is_const
is_abstract, is_external,
native_name != NULL, // is_native
script_class, procedure_helper.position_));
function.set_end_token_pos(procedure_helper.end_position_);
functions_.Add(&function);
function.set_kernel_offset(procedure_offset);
ActiveMemberScope active_member(&active_class_, &function);
procedure_helper.ReadUntilExcluding(ProcedureHelper::kFunction);
Tag function_node_tag = builder_.ReadTag();
ASSERT(function_node_tag == kSomething);
FunctionNodeHelper function_node_helper(&builder_);
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(RawFunction::kSyncGen);
break;
case FunctionNodeHelper::kAsync:
function.set_modifier(RawFunction::kAsync);
function.set_is_inlinable(!FLAG_causal_async_stacks);
break;
case FunctionNodeHelper::kAsyncStar:
function.set_modifier(RawFunction::kAsyncGen);
function.set_is_inlinable(!FLAG_causal_async_stacks);
break;
default:
// no special modifier
break;
}
ASSERT(function_node_helper.async_marker_ == FunctionNodeHelper::kSync);
if (native_name != NULL) {
function.set_native_name(*native_name);
}
function_node_helper.ReadUntilExcluding(FunctionNodeHelper::kTypeParameters);
if (!function.IsFactory()) {
// Read type_parameters list length.
intptr_t type_parameter_count = builder_.ReadListLength();
// Set type parameters.
LoadAndSetupTypeParameters(function, type_parameter_count, Class::Handle(Z),
function);
function_node_helper.SetJustRead(FunctionNodeHelper::kTypeParameters);
}
function_node_helper.ReadUntilExcluding(
FunctionNodeHelper::kRequiredParameterCount);
builder_.SetupFunctionParameters(owner, function, is_method,
false, // is_closure
&function_node_helper);
// Everything else is skipped implicitly, and procedure_helper and
// function_node_helper are no longer used.
builder_.SetOffset(procedure_end);
if (!in_class) {
library.AddObject(function, name);
ASSERT(!Object::Handle(
Z, library.LookupObjectAllowPrivate(
H.DartProcedureName(procedure_helper.canonical_name_)))
.IsNull());
}
if (FLAG_enable_mirrors && annotation_count > 0) {
library.AddFunctionMetadata(function, TokenPosition::kNoSource,
procedure_offset);
}
}
void KernelLoader::LoadAndSetupTypeParameters(
const Object& set_on,
intptr_t type_parameter_count,
const Class& parameterized_class,
const Function& parameterized_function) {
ASSERT(type_parameter_count >= 0);
if (type_parameter_count == 0) {
return;
}
// First setup the type parameters, so if any of the following code uses it
// (in a recursive way) we're fine.
TypeArguments& type_parameters =
TypeArguments::Handle(Z, TypeArguments::null());
TypeParameter& parameter = TypeParameter::Handle(Z);
Type& null_bound = Type::Handle(Z, Type::null());
// Step a) Create array of [TypeParameter] objects (without bound).
type_parameters = TypeArguments::New(type_parameter_count);
{
AlternativeReadingScope alt(builder_.reader_);
for (intptr_t i = 0; i < type_parameter_count; i++) {
builder_.SkipFlags();
builder_.SkipListOfExpressions(); // read annotations.
parameter = TypeParameter::New(
parameterized_class, parameterized_function, i,
H.DartSymbol(builder_.ReadStringReference()), // read ith name index.
null_bound, TokenPosition::kNoSource);
type_parameters.SetTypeAt(i, parameter);
builder_.SkipDartType(); // read guard.
}
}
ASSERT(set_on.IsClass() || set_on.IsFunction());
if (set_on.IsClass()) {
Class::Cast(set_on).set_type_parameters(type_parameters);
} else {
Function::Cast(set_on).set_type_parameters(type_parameters);
}
// Step b) Fill in the bounds of all [TypeParameter]s.
for (intptr_t i = 0; i < type_parameter_count; i++) {
builder_.SkipFlags();
builder_.SkipListOfExpressions(); // read annotations.
builder_.SkipStringReference(); // read ith name index.
// TODO(github.com/dart-lang/kernel/issues/42): This should be handled
// by the frontend.
parameter ^= type_parameters.TypeAt(i);
Tag tag = builder_.PeekTag(); // peek ith bound type.
if (tag == kDynamicType) {
builder_.SkipDartType(); // read ith bound.
parameter.set_bound(Type::Handle(Z, I->object_store()->object_type()));
} else {
AbstractType& bound =
T.BuildTypeWithoutFinalization(); // read ith bound.
if (bound.IsMalformedOrMalbounded()) {
bound = I->object_store()->object_type();
}
parameter.set_bound(bound);
}
}
}
const Object& KernelLoader::ClassForScriptAt(const Class& klass,
intptr_t source_uri_index) {
Script& correct_script = ScriptAt(source_uri_index);
if (klass.script() != correct_script.raw()) {
// 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.raw()) {
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;
}
Script& KernelLoader::ScriptAt(intptr_t index, StringIndex import_uri) {
Script& script = Script::ZoneHandle(Z);
script ^= scripts_.At(index);
if (script.IsNull()) {
// Create script with correct uri(s).
String& uri_string = builder_.SourceTableUriFor(index);
String& import_uri_string =
import_uri == -1 ? uri_string : H.DartString(import_uri, Heap::kOld);
script = Script::New(import_uri_string, uri_string,
builder_.GetSourceFor(index), RawScript::kKernelTag);
script.set_kernel_script_index(index);
script.set_kernel_string_offsets(H.string_offsets());
script.set_kernel_string_data(H.string_data());
script.set_kernel_canonical_names(H.canonical_names());
script.set_kernel_metadata_mappings(H.metadata_mappings());
script.set_kernel_metadata_payloads(H.metadata_payloads());
scripts_.SetAt(index, script);
script.set_line_starts(builder_.GetLineStartsFor(index));
script.set_debug_positions(Array::Handle(Array::null()));
script.set_yield_positions(Array::Handle(Array::null()));
}
return script;
}
void KernelLoader::GenerateFieldAccessors(const Class& klass,
const Field& field,
FieldHelper* field_helper) {
Tag tag = builder_.PeekTag();
if (field_helper->IsStatic() && tag == kNothing) {
// Static fields without an initializer are implicitly initialized to null.
// We do not need a getter.
field.SetStaticValue(Instance::Handle(Z), true);
return;
}
if (tag == kSomething) {
SimpleExpressionConverter converter(&H, &builder_);
const bool has_simple_initializer =
converter.IsSimple(builder_.ReaderOffset() + 1); // ignore the tag.
if (field_helper->IsStatic()) {
// Static fields with initializers either have the static value set to the
// initializer value if it is simple enough or else set to an
// uninitialized sentinel.
if (has_simple_initializer) {
// We do not need a getter.
field.SetStaticValue(converter.SimpleValue(), true);
return;
}
// We do need a getter that evaluates the initializer if necessary.
field.SetStaticValue(Object::sentinel(), true);
} else if (has_simple_initializer) {
// 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);
}
}
}
const String& getter_name = H.DartGetterName(field_helper->canonical_name_);
const Object& script_class =
ClassForScriptAt(klass, field_helper->source_uri_index_);
Function& getter = Function::ZoneHandle(
Z,
Function::New(
getter_name,
field_helper->IsStatic() ? RawFunction::kImplicitStaticFinalGetter
: RawFunction::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());
getter.set_result_type(AbstractType::Handle(Z, field.type()));
getter.set_is_debuggable(false);
SetupFieldAccessorFunction(klass, getter);
if (!field_helper->IsStatic() && !field_helper->IsFinal()) {
// Only static fields can be const.
ASSERT(!field_helper->IsConst());
const String& setter_name = H.DartSetterName(field_helper->canonical_name_);
Function& setter = Function::ZoneHandle(
Z, Function::New(setter_name, RawFunction::kImplicitSetter,
false, // is_static
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());
setter.set_result_type(Object::void_type());
setter.set_is_debuggable(false);
SetupFieldAccessorFunction(klass, setter);
}
}
void KernelLoader::SetupFieldAccessorFunction(const Class& klass,
const Function& function) {
bool is_setter = function.IsImplicitSetterFunction();
bool is_method = !function.IsStaticFunction();
intptr_t parameter_count = (is_method ? 1 : 0) + (is_setter ? 1 : 0);
function.SetNumOptionalParameters(0, false);
function.set_num_fixed_parameters(parameter_count);
function.set_parameter_types(
Array::Handle(Z, Array::New(parameter_count, Heap::kOld)));
function.set_parameter_names(
Array::Handle(Z, Array::New(parameter_count, Heap::kOld)));
intptr_t pos = 0;
if (is_method) {
function.SetParameterTypeAt(pos, T.ReceiverType(klass));
function.SetParameterNameAt(pos, Symbols::This());
pos++;
}
if (is_setter) {
function.SetParameterTypeAt(pos, AbstractType::dynamic_type());
function.SetParameterNameAt(pos, Symbols::Value());
pos++;
}
}
Library& KernelLoader::LookupLibrary(NameIndex library) {
Library* handle = NULL;
if (!libraries_.Lookup(library, &handle)) {
const String& url = H.DartSymbol(H.CanonicalNameString(library));
handle = &Library::Handle(Z, Library::LookupLibrary(thread_, url));
if (handle->IsNull()) {
*handle = Library::New(url);
handle->Register(thread_);
}
ASSERT(!handle->IsNull());
libraries_.Insert(library, handle);
}
return *handle;
}
Class& KernelLoader::LookupClass(NameIndex klass) {
Class* handle = NULL;
if (!classes_.Lookup(klass, &handle)) {
Library& library = LookupLibrary(H.CanonicalNameParent(klass));
const String& name = H.DartClassName(klass);
handle = &Class::Handle(Z, library.LookupLocalClass(name));
if (handle->IsNull()) {
*handle = Class::New(library, name, Script::Handle(Z),
TokenPosition::kNoSource);
library.AddClass(*handle);
}
// Insert the class in the cache before calling ReadPreliminaryClass so
// we do not risk allocating the class again by calling LookupClass
// recursively from ReadPreliminaryClass for the same class.
classes_.Insert(klass, handle);
}
return *handle;
}
RawFunction::Kind KernelLoader::GetFunctionType(
ProcedureHelper::Kind procedure_kind) {
intptr_t lookuptable[] = {
RawFunction::kRegularFunction, // Procedure::kMethod
RawFunction::kGetterFunction, // Procedure::kGetter
RawFunction::kSetterFunction, // Procedure::kSetter
RawFunction::kRegularFunction, // Procedure::kOperator
RawFunction::kConstructor, // Procedure::kFactory
};
intptr_t kind = static_cast<int>(procedure_kind);
ASSERT(0 <= kind && kind <= ProcedureHelper::kFactory);
return static_cast<RawFunction::Kind>(lookuptable[kind]);
}
ParsedFunction* ParseStaticFieldInitializer(Zone* zone, const Field& field) {
Thread* thread = Thread::Current();
String& init_name = String::Handle(zone, field.name());
init_name = Symbols::FromConcat(thread, Symbols::InitPrefix(), init_name);
// Create a static initializer.
const Object& owner = Object::Handle(field.RawOwner());
const Function& initializer_fun = Function::ZoneHandle(
zone, Function::New(init_name, RawFunction::kImplicitStaticFinalGetter,
true, // is_static
false, // is_const
false, // is_abstract
false, // is_external
false, // is_native
owner, TokenPosition::kNoSource));
initializer_fun.set_kernel_offset(field.kernel_offset());
initializer_fun.set_result_type(AbstractType::Handle(zone, field.type()));
initializer_fun.set_is_debuggable(false);
initializer_fun.set_is_reflectable(false);
initializer_fun.set_is_inlinable(false);
return new (zone) ParsedFunction(thread, initializer_fun);
}
} // namespace kernel
} // namespace dart
#endif // !defined(DART_PRECOMPILED_RUNTIME)
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