in runtime/class_linker.cc [353:701]
bool ClassLinker::InitWithoutImage(std::vector<std::unique_ptr<const DexFile>> boot_class_path,
std::string* error_msg) {
VLOG(startup) << "ClassLinker::Init";
Thread* const self = Thread::Current();
Runtime* const runtime = Runtime::Current();
gc::Heap* const heap = runtime->GetHeap();
CHECK(!heap->HasBootImageSpace()) << "Runtime has image. We should use it.";
CHECK(!init_done_);
// Use the pointer size from the runtime since we are probably creating the image.
image_pointer_size_ = InstructionSetPointerSize(runtime->GetInstructionSet());
if (!ValidPointerSize(image_pointer_size_)) {
*error_msg = StringPrintf("Invalid image pointer size: %zu", image_pointer_size_);
return false;
}
// java_lang_Class comes first, it's needed for AllocClass
// The GC can't handle an object with a null class since we can't get the size of this object.
heap->IncrementDisableMovingGC(self);
StackHandleScope<64> hs(self); // 64 is picked arbitrarily.
auto class_class_size = mirror::Class::ClassClassSize(image_pointer_size_);
Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>(
heap->AllocNonMovableObject<true>(self, nullptr, class_class_size, VoidFunctor()))));
CHECK(java_lang_Class.Get() != nullptr);
mirror::Class::SetClassClass(java_lang_Class.Get());
java_lang_Class->SetClass(java_lang_Class.Get());
if (kUseBakerOrBrooksReadBarrier) {
java_lang_Class->AssertReadBarrierPointer();
}
java_lang_Class->SetClassSize(class_class_size);
java_lang_Class->SetPrimitiveType(Primitive::kPrimNot);
heap->DecrementDisableMovingGC(self);
// AllocClass(mirror::Class*) can now be used
// Class[] is used for reflection support.
auto class_array_class_size = mirror::ObjectArray<mirror::Class>::ClassSize(image_pointer_size_);
Handle<mirror::Class> class_array_class(hs.NewHandle(
AllocClass(self, java_lang_Class.Get(), class_array_class_size)));
class_array_class->SetComponentType(java_lang_Class.Get());
// java_lang_Object comes next so that object_array_class can be created.
Handle<mirror::Class> java_lang_Object(hs.NewHandle(
AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize(image_pointer_size_))));
CHECK(java_lang_Object.Get() != nullptr);
// backfill Object as the super class of Class.
java_lang_Class->SetSuperClass(java_lang_Object.Get());
mirror::Class::SetStatus(java_lang_Object, mirror::Class::kStatusLoaded, self);
java_lang_Object->SetObjectSize(sizeof(mirror::Object));
// Allocate in non-movable so that it's possible to check if a JNI weak global ref has been
// cleared without triggering the read barrier and unintentionally mark the sentinel alive.
runtime->SetSentinel(heap->AllocNonMovableObject<true>(self,
java_lang_Object.Get(),
java_lang_Object->GetObjectSize(),
VoidFunctor()));
// Object[] next to hold class roots.
Handle<mirror::Class> object_array_class(hs.NewHandle(
AllocClass(self, java_lang_Class.Get(),
mirror::ObjectArray<mirror::Object>::ClassSize(image_pointer_size_))));
object_array_class->SetComponentType(java_lang_Object.Get());
// Setup the char (primitive) class to be used for char[].
Handle<mirror::Class> char_class(hs.NewHandle(
AllocClass(self, java_lang_Class.Get(),
mirror::Class::PrimitiveClassSize(image_pointer_size_))));
// The primitive char class won't be initialized by
// InitializePrimitiveClass until line 459, but strings (and
// internal char arrays) will be allocated before that and the
// component size, which is computed from the primitive type, needs
// to be set here.
char_class->SetPrimitiveType(Primitive::kPrimChar);
// Setup the char[] class to be used for String.
Handle<mirror::Class> char_array_class(hs.NewHandle(
AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize(image_pointer_size_))));
char_array_class->SetComponentType(char_class.Get());
mirror::CharArray::SetArrayClass(char_array_class.Get());
// Setup String.
Handle<mirror::Class> java_lang_String(hs.NewHandle(
AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize(image_pointer_size_))));
java_lang_String->SetStringClass();
mirror::String::SetClass(java_lang_String.Get());
mirror::Class::SetStatus(java_lang_String, mirror::Class::kStatusResolved, self);
// Setup java.lang.ref.Reference.
Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle(
AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize(image_pointer_size_))));
mirror::Reference::SetClass(java_lang_ref_Reference.Get());
java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize());
mirror::Class::SetStatus(java_lang_ref_Reference, mirror::Class::kStatusResolved, self);
// Create storage for root classes, save away our work so far (requires descriptors).
class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(
mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(),
kClassRootsMax));
CHECK(!class_roots_.IsNull());
SetClassRoot(kJavaLangClass, java_lang_Class.Get());
SetClassRoot(kJavaLangObject, java_lang_Object.Get());
SetClassRoot(kClassArrayClass, class_array_class.Get());
SetClassRoot(kObjectArrayClass, object_array_class.Get());
SetClassRoot(kCharArrayClass, char_array_class.Get());
SetClassRoot(kJavaLangString, java_lang_String.Get());
SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get());
// Setup the primitive type classes.
SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean));
SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte));
SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort));
SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt));
SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong));
SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat));
SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble));
SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid));
// Create array interface entries to populate once we can load system classes.
array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2));
// Create int array type for AllocDexCache (done in AppendToBootClassPath).
Handle<mirror::Class> int_array_class(hs.NewHandle(
AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize(image_pointer_size_))));
int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt));
mirror::IntArray::SetArrayClass(int_array_class.Get());
SetClassRoot(kIntArrayClass, int_array_class.Get());
// Create long array type for AllocDexCache (done in AppendToBootClassPath).
Handle<mirror::Class> long_array_class(hs.NewHandle(
AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize(image_pointer_size_))));
long_array_class->SetComponentType(GetClassRoot(kPrimitiveLong));
mirror::LongArray::SetArrayClass(long_array_class.Get());
SetClassRoot(kLongArrayClass, long_array_class.Get());
// now that these are registered, we can use AllocClass() and AllocObjectArray
// Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache.
Handle<mirror::Class> java_lang_DexCache(hs.NewHandle(
AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize(image_pointer_size_))));
SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get());
java_lang_DexCache->SetDexCacheClass();
java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize());
mirror::Class::SetStatus(java_lang_DexCache, mirror::Class::kStatusResolved, self);
// Set up array classes for string, field, method
Handle<mirror::Class> object_array_string(hs.NewHandle(
AllocClass(self, java_lang_Class.Get(),
mirror::ObjectArray<mirror::String>::ClassSize(image_pointer_size_))));
object_array_string->SetComponentType(java_lang_String.Get());
SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get());
LinearAlloc* linear_alloc = runtime->GetLinearAlloc();
// Create runtime resolution and imt conflict methods.
runtime->SetResolutionMethod(runtime->CreateResolutionMethod());
runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod(linear_alloc));
runtime->SetImtUnimplementedMethod(runtime->CreateImtConflictMethod(linear_alloc));
// Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create
// DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses
// these roots.
if (boot_class_path.empty()) {
*error_msg = "Boot classpath is empty.";
return false;
}
for (auto& dex_file : boot_class_path) {
if (dex_file.get() == nullptr) {
*error_msg = "Null dex file.";
return false;
}
AppendToBootClassPath(self, *dex_file);
boot_dex_files_.push_back(std::move(dex_file));
}
// now we can use FindSystemClass
// run char class through InitializePrimitiveClass to finish init
InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar);
SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor
// Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that
// we do not need friend classes or a publicly exposed setter.
quick_generic_jni_trampoline_ = GetQuickGenericJniStub();
if (!runtime->IsAotCompiler()) {
// We need to set up the generic trampolines since we don't have an image.
quick_resolution_trampoline_ = GetQuickResolutionStub();
quick_imt_conflict_trampoline_ = GetQuickImtConflictStub();
quick_to_interpreter_bridge_trampoline_ = GetQuickToInterpreterBridge();
}
// Object, String and DexCache need to be rerun through FindSystemClass to finish init
mirror::Class::SetStatus(java_lang_Object, mirror::Class::kStatusNotReady, self);
CheckSystemClass(self, java_lang_Object, "Ljava/lang/Object;");
CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize());
mirror::Class::SetStatus(java_lang_String, mirror::Class::kStatusNotReady, self);
CheckSystemClass(self, java_lang_String, "Ljava/lang/String;");
mirror::Class::SetStatus(java_lang_DexCache, mirror::Class::kStatusNotReady, self);
CheckSystemClass(self, java_lang_DexCache, "Ljava/lang/DexCache;");
CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize());
// Setup the primitive array type classes - can't be done until Object has a vtable.
SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z"));
mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass));
SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B"));
mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass));
CheckSystemClass(self, char_array_class, "[C");
SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S"));
mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass));
CheckSystemClass(self, int_array_class, "[I");
CheckSystemClass(self, long_array_class, "[J");
SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F"));
mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass));
SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D"));
mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass));
// Run Class through FindSystemClass. This initializes the dex_cache_ fields and register it
// in class_table_.
CheckSystemClass(self, java_lang_Class, "Ljava/lang/Class;");
CheckSystemClass(self, class_array_class, "[Ljava/lang/Class;");
CheckSystemClass(self, object_array_class, "[Ljava/lang/Object;");
// Setup the single, global copy of "iftable".
auto java_lang_Cloneable = hs.NewHandle(FindSystemClass(self, "Ljava/lang/Cloneable;"));
CHECK(java_lang_Cloneable.Get() != nullptr);
auto java_io_Serializable = hs.NewHandle(FindSystemClass(self, "Ljava/io/Serializable;"));
CHECK(java_io_Serializable.Get() != nullptr);
// We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to
// crawl up and explicitly list all of the supers as well.
array_iftable_.Read()->SetInterface(0, java_lang_Cloneable.Get());
array_iftable_.Read()->SetInterface(1, java_io_Serializable.Get());
// Sanity check Class[] and Object[]'s interfaces. GetDirectInterface may cause thread
// suspension.
CHECK_EQ(java_lang_Cloneable.Get(),
mirror::Class::GetDirectInterface(self, class_array_class, 0));
CHECK_EQ(java_io_Serializable.Get(),
mirror::Class::GetDirectInterface(self, class_array_class, 1));
CHECK_EQ(java_lang_Cloneable.Get(),
mirror::Class::GetDirectInterface(self, object_array_class, 0));
CHECK_EQ(java_io_Serializable.Get(),
mirror::Class::GetDirectInterface(self, object_array_class, 1));
CHECK_EQ(object_array_string.Get(),
FindSystemClass(self, GetClassRootDescriptor(kJavaLangStringArrayClass)));
// End of special init trickery, all subsequent classes may be loaded via FindSystemClass.
// Create java.lang.reflect.Proxy root.
SetClassRoot(kJavaLangReflectProxy, FindSystemClass(self, "Ljava/lang/reflect/Proxy;"));
// Create java.lang.reflect.Field.class root.
auto* class_root = FindSystemClass(self, "Ljava/lang/reflect/Field;");
CHECK(class_root != nullptr);
SetClassRoot(kJavaLangReflectField, class_root);
mirror::Field::SetClass(class_root);
// Create java.lang.reflect.Field array root.
class_root = FindSystemClass(self, "[Ljava/lang/reflect/Field;");
CHECK(class_root != nullptr);
SetClassRoot(kJavaLangReflectFieldArrayClass, class_root);
mirror::Field::SetArrayClass(class_root);
// Create java.lang.reflect.Constructor.class root and array root.
class_root = FindSystemClass(self, "Ljava/lang/reflect/Constructor;");
CHECK(class_root != nullptr);
SetClassRoot(kJavaLangReflectConstructor, class_root);
mirror::Constructor::SetClass(class_root);
class_root = FindSystemClass(self, "[Ljava/lang/reflect/Constructor;");
CHECK(class_root != nullptr);
SetClassRoot(kJavaLangReflectConstructorArrayClass, class_root);
mirror::Constructor::SetArrayClass(class_root);
// Create java.lang.reflect.Method.class root and array root.
class_root = FindSystemClass(self, "Ljava/lang/reflect/Method;");
CHECK(class_root != nullptr);
SetClassRoot(kJavaLangReflectMethod, class_root);
mirror::Method::SetClass(class_root);
class_root = FindSystemClass(self, "[Ljava/lang/reflect/Method;");
CHECK(class_root != nullptr);
SetClassRoot(kJavaLangReflectMethodArrayClass, class_root);
mirror::Method::SetArrayClass(class_root);
// java.lang.ref classes need to be specially flagged, but otherwise are normal classes
// finish initializing Reference class
mirror::Class::SetStatus(java_lang_ref_Reference, mirror::Class::kStatusNotReady, self);
CheckSystemClass(self, java_lang_ref_Reference, "Ljava/lang/ref/Reference;");
CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize());
CHECK_EQ(java_lang_ref_Reference->GetClassSize(),
mirror::Reference::ClassSize(image_pointer_size_));
class_root = FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;");
CHECK_EQ(class_root->GetClassFlags(), mirror::kClassFlagNormal);
class_root->SetClassFlags(class_root->GetClassFlags() | mirror::kClassFlagFinalizerReference);
class_root = FindSystemClass(self, "Ljava/lang/ref/PhantomReference;");
CHECK_EQ(class_root->GetClassFlags(), mirror::kClassFlagNormal);
class_root->SetClassFlags(class_root->GetClassFlags() | mirror::kClassFlagPhantomReference);
class_root = FindSystemClass(self, "Ljava/lang/ref/SoftReference;");
CHECK_EQ(class_root->GetClassFlags(), mirror::kClassFlagNormal);
class_root->SetClassFlags(class_root->GetClassFlags() | mirror::kClassFlagSoftReference);
class_root = FindSystemClass(self, "Ljava/lang/ref/WeakReference;");
CHECK_EQ(class_root->GetClassFlags(), mirror::kClassFlagNormal);
class_root->SetClassFlags(class_root->GetClassFlags() | mirror::kClassFlagWeakReference);
// Setup the ClassLoader, verifying the object_size_.
class_root = FindSystemClass(self, "Ljava/lang/ClassLoader;");
class_root->SetClassLoaderClass();
CHECK_EQ(class_root->GetObjectSize(), mirror::ClassLoader::InstanceSize());
SetClassRoot(kJavaLangClassLoader, class_root);
// Set up java.lang.Throwable, java.lang.ClassNotFoundException, and
// java.lang.StackTraceElement as a convenience.
SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;"));
mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable));
SetClassRoot(kJavaLangClassNotFoundException,
FindSystemClass(self, "Ljava/lang/ClassNotFoundException;"));
SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;"));
SetClassRoot(kJavaLangStackTraceElementArrayClass,
FindSystemClass(self, "[Ljava/lang/StackTraceElement;"));
mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement));
// Ensure void type is resolved in the core's dex cache so java.lang.Void is correctly
// initialized.
{
const DexFile& dex_file = java_lang_Object->GetDexFile();
const DexFile::TypeId* void_type_id = dex_file.FindTypeId("V");
CHECK(void_type_id != nullptr);
uint16_t void_type_idx = dex_file.GetIndexForTypeId(*void_type_id);
// Now we resolve void type so the dex cache contains it. We use java.lang.Object class
// as referrer so the used dex cache is core's one.
mirror::Class* resolved_type = ResolveType(dex_file, void_type_idx, java_lang_Object.Get());
CHECK_EQ(resolved_type, GetClassRoot(kPrimitiveVoid));
self->AssertNoPendingException();
}
// Create conflict tables that depend on the class linker.
runtime->FixupConflictTables();
FinishInit(self);
VLOG(startup) << "ClassLinker::InitFromCompiler exiting";
return true;
}