| // Copyright 2011 Google Inc. All Rights Reserved. |
| // Author: cshapiro@google.com (Carl Shapiro) |
| |
| #include "src/class_linker.h" |
| |
| #include <vector> |
| #include <utility> |
| |
| #include "src/casts.h" |
| #include "src/dex_verifier.h" |
| #include "src/heap.h" |
| #include "src/logging.h" |
| #include "src/monitor.h" |
| #include "src/object.h" |
| #include "src/raw_dex_file.h" |
| #include "src/scoped_ptr.h" |
| #include "src/thread.h" |
| #include "src/utils.h" |
| |
| namespace art { |
| |
| ClassLinker* ClassLinker::Create() { |
| scoped_ptr<ClassLinker> class_linker(new ClassLinker); |
| class_linker->Init(); |
| // TODO: check for failure during initialization |
| return class_linker.release(); |
| } |
| |
| void ClassLinker::Init() { |
| // Allocate and partially initialize the Class, Object, Field, Method classes. |
| // Initialization will be completed when the definitions are loaded. |
| java_lang_Class_ = reinterpret_cast<Class*>(Heap::AllocRaw(sizeof(Class), NULL)); |
| CHECK(java_lang_Class_ != NULL); |
| java_lang_Class_->descriptor_ = "Ljava/lang/Class;"; |
| java_lang_Class_->object_size_ = sizeof(Class); |
| java_lang_Class_->klass_ = java_lang_Class_; |
| |
| java_lang_Object_ = AllocClass(NULL); |
| CHECK(java_lang_Object_ != NULL); |
| java_lang_Object_->descriptor_ = "Ljava/lang/Object;"; |
| |
| java_lang_Class_->super_class_ = java_lang_Object_; |
| |
| java_lang_ref_Field_ = AllocClass(NULL); |
| CHECK(java_lang_ref_Field_ != NULL); |
| java_lang_ref_Field_->descriptor_ = "Ljava/lang/ref/Field;"; |
| |
| java_lang_ref_Method_ = AllocClass(NULL); |
| CHECK(java_lang_ref_Method_ != NULL); |
| java_lang_ref_Method_->descriptor_ = "Ljava/lang/Method;"; |
| |
| java_lang_Cloneable_ = AllocClass(NULL); |
| CHECK(java_lang_Cloneable_ != NULL); |
| java_lang_Cloneable_->descriptor_ = "Ljava/lang/Cloneable;"; |
| |
| java_io_Serializable_ = AllocClass(NULL); |
| CHECK(java_io_Serializable_ != NULL); |
| java_io_Serializable_->descriptor_ = "Ljava/io/Serializable;"; |
| |
| java_lang_String_ = AllocClass(NULL); |
| CHECK(java_lang_String_ != NULL); |
| java_lang_String_->descriptor_ = "Ljava/lang/String;"; |
| |
| // Allocate and initialize the primitive type classes. |
| primitive_byte_ = CreatePrimitiveClass("B"); |
| primitive_char_ = CreatePrimitiveClass("C"); |
| primitive_double_ = CreatePrimitiveClass("D"); |
| primitive_float_ = CreatePrimitiveClass("F"); |
| primitive_int_ = CreatePrimitiveClass("I"); |
| primitive_long_ = CreatePrimitiveClass("J"); |
| primitive_short_ = CreatePrimitiveClass("S"); |
| primitive_boolean_ = CreatePrimitiveClass("Z"); |
| primitive_void_ = CreatePrimitiveClass("V"); |
| |
| char_array_class_ = FindSystemClass("[C"); |
| CHECK(char_array_class_ != NULL); |
| } |
| |
| Class* ClassLinker::AllocClass(DexFile* dex_file) { |
| Class* klass = reinterpret_cast<Class*>(Heap::AllocObject(java_lang_Class_)); |
| klass->dex_file_ = dex_file; |
| return klass; |
| } |
| |
| StaticField* ClassLinker::AllocStaticField() { |
| return reinterpret_cast<StaticField*>(Heap::AllocRaw(sizeof(StaticField), java_lang_ref_Field_)); |
| } |
| |
| InstanceField* ClassLinker::AllocInstanceField() { |
| return reinterpret_cast<InstanceField*>(Heap::AllocRaw(sizeof(InstanceField), java_lang_ref_Field_)); |
| } |
| |
| Method* ClassLinker::AllocMethod() { |
| return reinterpret_cast<Method*>(Heap::AllocRaw(sizeof(Method), java_lang_ref_Method_)); |
| } |
| |
| Class* ClassLinker::FindClass(const StringPiece& descriptor, |
| Object* class_loader) { |
| Thread* self = Thread::Current(); |
| DCHECK(self != NULL); |
| CHECK(!self->IsExceptionPending()); |
| // Find the class in the loaded classes table. |
| Class* klass = LookupClass(descriptor, class_loader); |
| if (klass == NULL) { |
| // Class is not yet loaded. |
| if (descriptor[0] == '[') { |
| return CreateArrayClass(descriptor, class_loader); |
| } |
| ClassPathEntry pair = FindInClassPath(descriptor); |
| if (pair.first == NULL) { |
| LG << "Class " << descriptor << " not found"; // TODO: NoClassDefFoundError |
| return NULL; |
| } |
| DexFile* dex_file = pair.first; |
| const RawDexFile::ClassDef* class_def = pair.second; |
| // Load the class from the dex file. |
| if (descriptor == "Ljava/lang/Object;") { |
| klass = java_lang_Object_; |
| klass->dex_file_ = dex_file; |
| klass->object_size_ = sizeof(Object); |
| char_array_class_->super_class_idx_ = class_def->class_idx_; |
| } else if (descriptor == "Ljava/lang/Class;") { |
| klass = java_lang_Class_; |
| klass->dex_file_ = dex_file; |
| klass->object_size_ = sizeof(Class); |
| } else if (descriptor == "Ljava/lang/ref/Field;") { |
| klass = java_lang_ref_Field_; |
| klass->dex_file_ = dex_file; |
| klass->object_size_ = sizeof(Field); |
| } else if (descriptor == "Ljava/lang/ref/Method;") { |
| klass = java_lang_ref_Method_; |
| klass->dex_file_ = dex_file; |
| klass->object_size_ = sizeof(Method); |
| } else if (descriptor == "Ljava/lang/Cloneable;") { |
| klass = java_lang_Cloneable_; |
| klass->dex_file_ = dex_file; |
| } else if (descriptor == "Ljava/io/Serializable;") { |
| klass = java_io_Serializable_; |
| klass->dex_file_ = dex_file; |
| } else if (descriptor == "Ljava/lang/String;") { |
| klass = java_lang_String_; |
| klass->dex_file_ = dex_file; |
| klass->object_size_ = sizeof(String); |
| } else { |
| klass = AllocClass(dex_file); |
| } |
| LoadClass(*class_def, klass); |
| // Check for a pending exception during load |
| if (self->IsExceptionPending()) { |
| // TODO: free native allocations in klass |
| return NULL; |
| } |
| { |
| ObjectLock lock(klass); |
| klass->clinit_thread_id_ = self->GetId(); |
| // Add the newly loaded class to the loaded classes table. |
| bool success = InsertClass(klass); |
| if (!success) { |
| // We may fail to insert if we raced with another thread. |
| klass->clinit_thread_id_ = 0; |
| // TODO: free native allocations in klass |
| klass = LookupClass(descriptor, class_loader); |
| CHECK(klass != NULL); |
| } else { |
| // Link the class. |
| if (!LinkClass(klass)) { |
| // Linking failed. |
| // TODO: CHECK(self->IsExceptionPending()); |
| lock.NotifyAll(); |
| return NULL; |
| } |
| } |
| } |
| } |
| // Link the class if it has not already been linked. |
| if (!klass->IsLinked() && !klass->IsErroneous()) { |
| ObjectLock lock(klass); |
| // Check for circular dependencies between classes. |
| if (!klass->IsLinked() && klass->clinit_thread_id_ == self->GetId()) { |
| LG << "Recursive link"; // TODO: ClassCircularityError |
| return NULL; |
| } |
| // Wait for the pending initialization to complete. |
| while (!klass->IsLinked() && !klass->IsErroneous()) { |
| lock.Wait(); |
| } |
| } |
| if (klass->IsErroneous()) { |
| LG << "EarlierClassFailure"; // TODO: EarlierClassFailure |
| return NULL; |
| } |
| // Return the loaded class. No exceptions should be pending. |
| CHECK(!self->IsExceptionPending()); |
| return klass; |
| } |
| |
| void ClassLinker::LoadClass(const RawDexFile::ClassDef& class_def, Class* klass) { |
| CHECK(klass != NULL); |
| CHECK(klass->dex_file_ != NULL); |
| const RawDexFile* raw = klass->GetDexFile()->GetRaw(); |
| const byte* class_data = raw->GetClassData(class_def); |
| RawDexFile::ClassDataHeader header = raw->ReadClassDataHeader(&class_data); |
| |
| const char* descriptor = raw->GetClassDescriptor(class_def); |
| CHECK(descriptor != NULL); |
| |
| klass->klass_ = java_lang_Class_; |
| klass->descriptor_.set(descriptor); |
| klass->descriptor_alloc_ = NULL; |
| klass->access_flags_ = class_def.access_flags_; |
| klass->class_loader_ = NULL; // TODO |
| klass->primitive_type_ = Class::kPrimNot; |
| klass->status_ = Class::kStatusIdx; |
| |
| klass->super_class_ = NULL; |
| klass->super_class_idx_ = class_def.superclass_idx_; |
| |
| klass->num_sfields_ = header.static_fields_size_; |
| klass->num_ifields_ = header.instance_fields_size_; |
| klass->num_direct_methods_ = header.direct_methods_size_; |
| klass->num_virtual_methods_ = header.virtual_methods_size_; |
| |
| klass->source_file_ = raw->dexGetSourceFile(class_def); |
| |
| // Load class interfaces. |
| LoadInterfaces(class_def, klass); |
| |
| // Load static fields. |
| if (klass->num_sfields_ != 0) { |
| // TODO: allocate on the object heap. |
| klass->sfields_ = new StaticField*[klass->NumStaticFields()](); |
| uint32_t last_idx = 0; |
| for (size_t i = 0; i < klass->num_sfields_; ++i) { |
| RawDexFile::Field raw_field; |
| raw->dexReadClassDataField(&class_data, &raw_field, &last_idx); |
| StaticField* sfield = AllocStaticField(); |
| klass->sfields_[i] = sfield; |
| LoadField(klass, raw_field, sfield); |
| } |
| } |
| |
| // Load instance fields. |
| if (klass->NumInstanceFields() != 0) { |
| // TODO: allocate on the object heap. |
| klass->ifields_ = new InstanceField*[klass->NumInstanceFields()](); |
| uint32_t last_idx = 0; |
| for (size_t i = 0; i < klass->NumInstanceFields(); ++i) { |
| RawDexFile::Field raw_field; |
| raw->dexReadClassDataField(&class_data, &raw_field, &last_idx); |
| InstanceField* ifield = AllocInstanceField(); |
| klass->ifields_[i] = ifield; |
| LoadField(klass, raw_field, ifield); |
| } |
| } |
| |
| // Load direct methods. |
| if (klass->NumDirectMethods() != 0) { |
| // TODO: append direct methods to class object |
| klass->direct_methods_ = new Method*[klass->NumDirectMethods()](); |
| uint32_t last_idx = 0; |
| for (size_t i = 0; i < klass->NumDirectMethods(); ++i) { |
| RawDexFile::Method raw_method; |
| raw->dexReadClassDataMethod(&class_data, &raw_method, &last_idx); |
| Method* meth = AllocMethod(); |
| klass->direct_methods_[i] = meth; |
| LoadMethod(klass, raw_method, meth); |
| // TODO: register maps |
| } |
| } |
| |
| // Load virtual methods. |
| if (klass->NumVirtualMethods() != 0) { |
| // TODO: append virtual methods to class object |
| klass->virtual_methods_ = new Method*[klass->NumVirtualMethods()](); |
| uint32_t last_idx = 0; |
| for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { |
| RawDexFile::Method raw_method; |
| raw->dexReadClassDataMethod(&class_data, &raw_method, &last_idx); |
| Method* meth = AllocMethod(); |
| klass->virtual_methods_[i] = meth; |
| LoadMethod(klass, raw_method, meth); |
| // TODO: register maps |
| } |
| } |
| } |
| |
| void ClassLinker::LoadInterfaces(const RawDexFile::ClassDef& class_def, |
| Class* klass) { |
| const RawDexFile* raw = klass->GetDexFile()->GetRaw(); |
| const RawDexFile::TypeList* list = raw->GetInterfacesList(class_def); |
| if (list != NULL) { |
| klass->interface_count_ = list->Size(); |
| // TODO: allocate the interfaces array on the object heap. |
| klass->interfaces_ = new Class*[list->Size()](); |
| for (size_t i = 0; i < list->Size(); ++i) { |
| const RawDexFile::TypeItem& type_item = list->GetTypeItem(i); |
| klass->interfaces_[i] = reinterpret_cast<Class*>(type_item.type_idx_); |
| } |
| } |
| } |
| |
| void ClassLinker::LoadField(Class* klass, const RawDexFile::Field& src, |
| Field* dst) { |
| const RawDexFile* raw = klass->GetDexFile()->GetRaw(); |
| const RawDexFile::FieldId& field_id = raw->GetFieldId(src.field_idx_); |
| dst->klass_ = klass; |
| dst->name_ = raw->dexStringById(field_id.name_idx_); |
| dst->signature_ = raw->dexStringByTypeIdx(field_id.type_idx_); |
| dst->access_flags_ = src.access_flags_; |
| } |
| |
| void ClassLinker::LoadMethod(Class* klass, const RawDexFile::Method& src, |
| Method* dst) { |
| const RawDexFile* raw = klass->GetDexFile()->GetRaw(); |
| const RawDexFile::MethodId& method_id = raw->GetMethodId(src.method_idx_); |
| dst->klass_ = klass; |
| dst->name_.set(raw->dexStringById(method_id.name_idx_)); |
| dst->proto_idx_ = method_id.proto_idx_; |
| dst->shorty_.set(raw->GetShorty(method_id.proto_idx_)); |
| dst->access_flags_ = src.access_flags_; |
| |
| // TODO: check for finalize method |
| |
| const RawDexFile::CodeItem* code_item = raw->GetCodeItem(src); |
| if (code_item != NULL) { |
| dst->num_registers_ = code_item->registers_size_; |
| dst->num_ins_ = code_item->ins_size_; |
| dst->num_outs_ = code_item->outs_size_; |
| dst->insns_ = code_item->insns_; |
| } else { |
| uint16_t num_args = dst->NumArgRegisters(); |
| if (!dst->IsStatic()) { |
| ++num_args; |
| } |
| dst->num_registers_ = dst->num_ins_ + num_args; |
| // TODO: native methods |
| } |
| } |
| |
| ClassLinker::ClassPathEntry ClassLinker::FindInClassPath(const StringPiece& descriptor) { |
| for (size_t i = 0; i != class_path_.size(); ++i) { |
| DexFile* dex_file = class_path_[i]; |
| const RawDexFile::ClassDef* class_def = dex_file->GetRaw()->FindClassDef(descriptor); |
| if (class_def != NULL) { |
| return ClassPathEntry(dex_file, class_def); |
| } |
| } |
| return ClassPathEntry(NULL, NULL); |
| } |
| |
| void ClassLinker::AppendToClassPath(DexFile* dex_file) { |
| class_path_.push_back(dex_file); |
| } |
| |
| Class* ClassLinker::CreatePrimitiveClass(const StringPiece& descriptor) { |
| Class* klass = AllocClass(NULL); |
| CHECK(klass != NULL); |
| klass->super_class_ = NULL; |
| klass->access_flags_ = kAccPublic | kAccFinal | kAccAbstract; |
| klass->descriptor_ = descriptor; |
| klass->descriptor_alloc_ = NULL; |
| klass->status_ = Class::kStatusInitialized; |
| bool success = InsertClass(klass); |
| CHECK(success); |
| return klass; |
| } |
| |
| /* |
| * Create an array class (i.e. the class object for the array, not the |
| * array itself). "descriptor" looks like "[C" or "[[[[B" or |
| * "[Ljava/lang/String;". |
| * |
| * If "descriptor" refers to an array of primitives, look up the |
| * primitive type's internally-generated class object. |
| * |
| * "loader" is the class loader of the class that's referring to us. It's |
| * used to ensure that we're looking for the element type in the right |
| * context. It does NOT become the class loader for the array class; that |
| * always comes from the base element class. |
| * |
| * Returns NULL with an exception raised on failure. |
| */ |
| Class* ClassLinker::CreateArrayClass(const StringPiece& descriptor, Object* class_loader) |
| { |
| CHECK(descriptor[0] == '['); |
| DCHECK(java_lang_Class_ != NULL); |
| DCHECK(java_lang_Object_ != NULL); |
| |
| /* |
| * Identify the underlying element class and the array dimension depth. |
| */ |
| Class* component_type_ = NULL; |
| int array_rank; |
| if (descriptor[1] == '[') { |
| /* array of arrays; keep descriptor and grab stuff from parent */ |
| Class* outer = FindClass(descriptor.substr(1), class_loader); |
| if (outer != NULL) { |
| /* want the base class, not "outer", in our component_type_ */ |
| component_type_ = outer->component_type_; |
| array_rank = outer->array_rank_ + 1; |
| } else { |
| DCHECK(component_type_ == NULL); /* make sure we fail */ |
| } |
| } else { |
| array_rank = 1; |
| if (descriptor[1] == 'L') { |
| /* array of objects; strip off "[" and look up descriptor. */ |
| const StringPiece subDescriptor = descriptor.substr(1); |
| LG << "searching for element class '" << subDescriptor << "'"; |
| component_type_ = FindClass(subDescriptor, class_loader); // TODO FindClassNoInit |
| } else { |
| /* array of a primitive type */ |
| component_type_ = FindPrimitiveClass(descriptor[1]); |
| } |
| } |
| |
| if (component_type_ == NULL) { |
| /* failed */ |
| DCHECK(Thread::Current()->IsExceptionPending()); |
| return NULL; |
| } |
| |
| /* |
| * See if the component type is already loaded. Array classes are |
| * always associated with the class loader of their underlying |
| * element type -- an array of Strings goes with the loader for |
| * java/lang/String -- so we need to look for it there. (The |
| * caller should have checked for the existence of the class |
| * before calling here, but they did so with *their* class loader, |
| * not the component type's loader.) |
| * |
| * If we find it, the caller adds "loader" to the class' initiating |
| * loader list, which should prevent us from going through this again. |
| * |
| * This call is unnecessary if "loader" and "component_type_->class_loader_" |
| * are the same, because our caller (FindClass) just did the |
| * lookup. (Even if we get this wrong we still have correct behavior, |
| * because we effectively do this lookup again when we add the new |
| * class to the hash table --- necessary because of possible races with |
| * other threads.) |
| */ |
| if (class_loader != component_type_->class_loader_) { |
| Class* new_class = LookupClass(descriptor, component_type_->class_loader_); |
| if (new_class != NULL) { |
| return new_class; |
| } |
| } |
| |
| /* |
| * Fill out the fields in the Class. |
| * |
| * It is possible to execute some methods against arrays, because |
| * all arrays are subclasses of java_lang_Object_, so we need to set |
| * up a vtable. We can just point at the one in java_lang_Object_. |
| * |
| * Array classes are simple enough that we don't need to do a full |
| * link step. |
| */ |
| Class* new_class = AllocClass(NULL); |
| if (new_class == NULL) { |
| return NULL; |
| } |
| new_class->descriptor_alloc_ = new std::string(descriptor.data(), |
| descriptor.size()); |
| new_class->descriptor_.set(new_class->descriptor_alloc_->data(), |
| new_class->descriptor_alloc_->size()); |
| new_class->super_class_ = java_lang_Object_; |
| new_class->vtable_count_ = java_lang_Object_->vtable_count_; |
| new_class->vtable_ = java_lang_Object_->vtable_; |
| new_class->primitive_type_ = Class::kPrimNot; |
| new_class->component_type_ = component_type_; |
| new_class->class_loader_ = component_type_->class_loader_; |
| new_class->array_rank_ = array_rank; |
| new_class->status_ = Class::kStatusInitialized; |
| |
| /* don't need to set new_class->object_size_ */ |
| |
| /* |
| * All arrays have java/lang/Cloneable and java/io/Serializable as |
| * interfaces. We need to set that up here, so that stuff like |
| * "instanceof" works right. |
| * |
| * Note: The GC could run during the call to FindSystemClassNoInit(), |
| * so we need to make sure the class object is GC-valid while we're in |
| * there. Do this by clearing the interface list so the GC will just |
| * think that the entries are null. |
| * |
| * TODO? |
| * We may want to create a single, global copy of "interfaces" and |
| * "iftable" somewhere near the start and just point to those (and |
| * remember not to free them for arrays). |
| */ |
| new_class->interface_count_ = 2; |
| new_class->interfaces_ = new Class*[2]; |
| memset(new_class->interfaces_, 0, sizeof(Class*) * 2); |
| new_class->interfaces_[0] = java_lang_Cloneable_; |
| new_class->interfaces_[1] = java_io_Serializable_; |
| /* |
| * 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. These interfaces don't have any methods, so we |
| * don't have to worry about the ifviPool either. |
| */ |
| new_class->iftable_count_ = 2; |
| new_class->iftable_ = new InterfaceEntry[2]; |
| memset(new_class->iftable_, 0, sizeof(InterfaceEntry) * 2); |
| new_class->iftable_[0].SetClass(new_class->interfaces_[0]); |
| new_class->iftable_[1].SetClass(new_class->interfaces_[1]); |
| |
| /* |
| * Inherit access flags from the component type. Arrays can't be |
| * used as a superclass or interface, so we want to add "final" |
| * and remove "interface". |
| * |
| * Don't inherit any non-standard flags (e.g., kAccFinal) |
| * from component_type_. We assume that the array class does not |
| * override finalize(). |
| */ |
| new_class->access_flags_ = ((new_class->component_type_->access_flags_ & |
| ~kAccInterface) | kAccFinal) & kAccJavaFlagsMask; |
| |
| if (InsertClass(new_class)) { |
| return new_class; |
| } |
| /* |
| * Another thread must have loaded the class after we |
| * started but before we finished. Abandon what we've |
| * done. |
| * |
| * (Yes, this happens.) |
| */ |
| |
| /* Grab the winning class. |
| */ |
| Class* other_class = LookupClass(descriptor, component_type_->class_loader_); |
| DCHECK(other_class != NULL); |
| return other_class; |
| } |
| |
| Class* ClassLinker::FindPrimitiveClass(char type) { |
| switch (type) { |
| case 'B': |
| CHECK(primitive_byte_ != NULL); |
| return primitive_byte_; |
| case 'C': |
| CHECK(primitive_char_ != NULL); |
| return primitive_char_; |
| case 'D': |
| CHECK(primitive_double_ != NULL); |
| return primitive_double_; |
| case 'F': |
| CHECK(primitive_float_ != NULL); |
| return primitive_float_; |
| case 'I': |
| CHECK(primitive_int_ != NULL); |
| return primitive_int_; |
| case 'J': |
| CHECK(primitive_long_ != NULL); |
| return primitive_long_; |
| case 'S': |
| CHECK(primitive_short_ != NULL); |
| return primitive_short_; |
| case 'Z': |
| CHECK(primitive_boolean_ != NULL); |
| return primitive_boolean_; |
| case 'V': |
| CHECK(primitive_void_ != NULL); |
| return primitive_void_; |
| case 'L': |
| case '[': |
| LOG(ERROR) << "Not a primitive type " << static_cast<int>(type); |
| default: |
| LOG(ERROR) << "Unknown primitive type " << static_cast<int>(type); |
| }; |
| return NULL; // Not reachable. |
| } |
| |
| bool ClassLinker::InsertClass(Class* klass) { |
| // TODO: acquire classes_lock_ |
| const StringPiece& key = klass->GetDescriptor(); |
| bool success = classes_.insert(std::make_pair(key, klass)).second; |
| // TODO: release classes_lock_ |
| return success; |
| } |
| |
| Class* ClassLinker::LookupClass(const StringPiece& descriptor, Object* class_loader) { |
| // TODO: acquire classes_lock_ |
| Table::iterator it = classes_.find(descriptor); |
| // TODO: release classes_lock_ |
| if (it == classes_.end()) { |
| return NULL; |
| } else { |
| return (*it).second; |
| } |
| } |
| |
| bool ClassLinker::InitializeClass(Class* klass) { |
| CHECK(klass->GetStatus() == Class::kStatusResolved || |
| klass->GetStatus() == Class::kStatusError); |
| |
| Thread* self = Thread::Current(); |
| |
| { |
| ObjectLock lock(klass); |
| |
| if (klass->GetStatus() < Class::kStatusVerified) { |
| if (klass->IsErroneous()) { |
| LG << "re-initializing failed class"; // TODO: throw |
| return false; |
| } |
| |
| CHECK(klass->GetStatus() == Class::kStatusResolved); |
| |
| klass->status_ = Class::kStatusVerifying; |
| if (!DexVerify::VerifyClass(klass)) { |
| LG << "Verification failed"; // TODO: ThrowVerifyError |
| Object* exception = self->GetException(); |
| klass->SetObjectAt(OFFSETOF_MEMBER(Class, verify_error_class_), |
| exception->GetClass()); |
| klass->SetStatus(Class::kStatusError); |
| return false; |
| } |
| |
| klass->SetStatus(Class::kStatusVerified); |
| } |
| |
| if (klass->status_ == Class::kStatusInitialized) { |
| return true; |
| } |
| |
| while (klass->status_ == Class::kStatusInitializing) { |
| // we caught somebody else in the act; was it us? |
| if (klass->clinit_thread_id_ == self->GetId()) { |
| LG << "recursive <clinit>"; |
| return true; |
| } |
| |
| CHECK(!self->IsExceptionPending()); |
| |
| lock.Wait(); // TODO: check for interruption |
| |
| // When we wake up, repeat the test for init-in-progress. If |
| // there's an exception pending (only possible if |
| // "interruptShouldThrow" was set), bail out. |
| if (self->IsExceptionPending()) { |
| CHECK(false); |
| LG << "Exception in initialization."; // TODO: ExceptionInInitializerError |
| klass->SetStatus(Class::kStatusError); |
| return false; |
| } |
| if (klass->GetStatus() == Class::kStatusInitializing) { |
| continue; |
| } |
| DCHECK(klass->GetStatus() == Class::kStatusInitialized || |
| klass->GetStatus() == Class::kStatusError); |
| if (klass->IsErroneous()) { |
| /* |
| * The caller wants an exception, but it was thrown in a |
| * different thread. Synthesize one here. |
| */ |
| LG << "<clinit> failed"; // TODO: throw UnsatisfiedLinkError |
| return false; |
| } |
| return true; // otherwise, initialized |
| } |
| |
| // see if we failed previously |
| if (klass->IsErroneous()) { |
| // might be wise to unlock before throwing; depends on which class |
| // it is that we have locked |
| |
| // TODO: throwEarlierClassFailure(klass); |
| return false; |
| } |
| |
| if (!ValidateSuperClassDescriptors(klass)) { |
| klass->SetStatus(Class::kStatusError); |
| return false; |
| } |
| |
| DCHECK(klass->status_ < Class::kStatusInitializing); |
| |
| klass->clinit_thread_id_ = self->GetId(); |
| klass->status_ = Class::kStatusInitializing; |
| } |
| |
| if (!InitializeSuperClass(klass)) { |
| return false; |
| } |
| |
| InitializeStaticFields(klass); |
| |
| Method* clinit = klass->FindDirectMethodLocally("<clinit>", "()V"); |
| if (clinit != NULL) { |
| } else { |
| // JValue unused; |
| // TODO: dvmCallMethod(self, method, NULL, &unused); |
| //CHECK(!"unimplemented"); |
| } |
| |
| { |
| ObjectLock lock(klass); |
| |
| if (self->IsExceptionPending()) { |
| klass->SetStatus(Class::kStatusError); |
| } else { |
| klass->SetStatus(Class::kStatusInitialized); |
| } |
| lock.NotifyAll(); |
| } |
| |
| return true; |
| } |
| |
| bool ClassLinker::ValidateSuperClassDescriptors(const Class* klass) { |
| if (klass->IsInterface()) { |
| return true; |
| } |
| // begin with the methods local to the superclass |
| if (klass->HasSuperClass() && |
| klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) { |
| const Class* super = klass->GetSuperClass(); |
| for (int i = super->NumVirtualMethods() - 1; i >= 0; --i) { |
| const Method* method = klass->GetVirtualMethod(i); |
| if (method != super->GetVirtualMethod(i) && |
| !HasSameMethodDescriptorClasses(method, super, klass)) { |
| LG << "Classes resolve differently in superclass"; |
| return false; |
| } |
| } |
| } |
| for (size_t i = 0; i < klass->iftable_count_; ++i) { |
| const InterfaceEntry* iftable = &klass->iftable_[i]; |
| Class* interface = iftable->GetClass(); |
| if (klass->GetClassLoader() != interface->GetClassLoader()) { |
| for (size_t j = 0; j < interface->NumVirtualMethods(); ++j) { |
| uint32_t vtable_index = iftable->method_index_array_[j]; |
| const Method* method = klass->GetVirtualMethod(vtable_index); |
| if (!HasSameMethodDescriptorClasses(method, interface, |
| method->GetClass())) { |
| LG << "Classes resolve differently in interface"; // TODO: LinkageError |
| return false; |
| } |
| } |
| } |
| } |
| return true; |
| } |
| |
| bool ClassLinker::HasSameMethodDescriptorClasses(const Method* method, |
| const Class* klass1, |
| const Class* klass2) { |
| const RawDexFile* raw = method->GetClass()->GetDexFile()->GetRaw(); |
| const RawDexFile::ProtoId& proto_id = raw->GetProtoId(method->proto_idx_); |
| RawDexFile::ParameterIterator *it; |
| for (it = raw->GetParameterIterator(proto_id); it->HasNext(); it->Next()) { |
| const char* descriptor = it->GetDescriptor(); |
| if (descriptor == NULL) { |
| break; |
| } |
| if (descriptor[0] == 'L' || descriptor[0] == '[') { |
| // Found a non-primitive type. |
| if (!HasSameDescriptorClasses(descriptor, klass1, klass2)) { |
| return false; |
| } |
| } |
| } |
| // Check the return type |
| const char* descriptor = raw->GetReturnTypeDescriptor(proto_id); |
| if (descriptor[0] == 'L' || descriptor[0] == '[') { |
| if (HasSameDescriptorClasses(descriptor, klass1, klass2)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| // Returns true if classes referenced by the descriptor are the |
| // same classes in klass1 as they are in klass2. |
| bool ClassLinker::HasSameDescriptorClasses(const char* descriptor, |
| const Class* klass1, |
| const Class* klass2) { |
| CHECK(descriptor != NULL); |
| CHECK(klass1 != NULL); |
| CHECK(klass2 != NULL); |
| #if 0 |
| Class* found1 = FindClassNoInit(descriptor, klass1->GetClassLoader()); |
| // TODO: found1 == NULL |
| Class* found2 = FindClassNoInit(descriptor, klass2->GetClassLoader()); |
| // TODO: found2 == NULL |
| // TODO: lookup found1 in initiating loader list |
| if (found1 == NULL || found2 == NULL) { |
| Thread::Current()->ClearException(); |
| if (found1 == found2) { |
| return true; |
| } else { |
| return false; |
| } |
| } |
| #endif |
| return true; |
| } |
| |
| bool ClassLinker::InitializeSuperClass(Class* klass) { |
| CHECK(klass != NULL); |
| // TODO: assert klass lock is acquired |
| if (!klass->IsInterface() && klass->HasSuperClass()) { |
| Class* super_class = klass->GetSuperClass(); |
| if (super_class->GetStatus() != Class::kStatusInitialized) { |
| CHECK(!super_class->IsInterface()); |
| klass->MonitorExit(); |
| bool super_initialized = InitializeClass(super_class); |
| klass->MonitorEnter(); |
| // TODO: check for a pending exception |
| if (!super_initialized) { |
| klass->SetStatus(Class::kStatusError); |
| klass->NotifyAll(); |
| return false; |
| } |
| } |
| } |
| return true; |
| } |
| |
| void ClassLinker::InitializeStaticFields(Class* klass) { |
| size_t num_static_fields = klass->NumStaticFields(); |
| if (num_static_fields == 0) { |
| return; |
| } |
| DexFile* dex_file = klass->GetDexFile(); |
| if (dex_file == NULL) { |
| return; |
| } |
| const StringPiece& descriptor = klass->GetDescriptor(); |
| const RawDexFile* raw = dex_file->GetRaw(); |
| const RawDexFile::ClassDef* class_def = raw->FindClassDef(descriptor); |
| CHECK(class_def != NULL); |
| const byte* addr = raw->GetEncodedArray(*class_def); |
| size_t array_size = DecodeUnsignedLeb128(&addr); |
| for (size_t i = 0; i < array_size; ++i) { |
| StaticField* field = klass->GetStaticField(i); |
| JValue value; |
| RawDexFile::ValueType type = raw->ReadEncodedValue(&addr, &value); |
| switch (type) { |
| case RawDexFile::kByte: |
| field->SetByte(value.b); |
| break; |
| case RawDexFile::kShort: |
| field->SetShort(value.s); |
| break; |
| case RawDexFile::kChar: |
| field->SetChar(value.c); |
| break; |
| case RawDexFile::kInt: |
| field->SetInt(value.i); |
| break; |
| case RawDexFile::kLong: |
| field->SetLong(value.j); |
| break; |
| case RawDexFile::kFloat: |
| field->SetFloat(value.f); |
| break; |
| case RawDexFile::kDouble: |
| field->SetDouble(value.d); |
| break; |
| case RawDexFile::kString: { |
| uint32_t string_idx = value.i; |
| String* resolved = ResolveString(klass, string_idx); |
| field->SetObject(resolved); |
| break; |
| } |
| case RawDexFile::kBoolean: |
| field->SetBoolean(value.z); |
| break; |
| case RawDexFile::kNull: |
| field->SetObject(value.l); |
| break; |
| default: |
| LOG(FATAL) << "Unknown type " << static_cast<int>(type); |
| } |
| } |
| } |
| |
| bool ClassLinker::LinkClass(Class* klass) { |
| CHECK(klass->status_ == Class::kStatusIdx || |
| klass->status_ == Class::kStatusLoaded); |
| if (klass->status_ == Class::kStatusIdx) { |
| if (!LinkInterfaces(klass)) { |
| return false; |
| } |
| } |
| if (!LinkSuperClass(klass)) { |
| return false; |
| } |
| if (!LinkMethods(klass)) { |
| return false; |
| } |
| if (!LinkInstanceFields(klass)) { |
| return false; |
| } |
| CreateReferenceOffsets(klass); |
| CHECK_EQ(klass->status_, Class::kStatusLoaded); |
| klass->status_ = Class::kStatusResolved; |
| return true; |
| } |
| |
| bool ClassLinker::LinkInterfaces(Class* klass) { |
| scoped_array<uint32_t> interfaces_idx; |
| // TODO: store interfaces_idx in the Class object |
| // TODO: move this outside of link interfaces |
| if (klass->interface_count_ > 0) { |
| size_t length = klass->interface_count_ * sizeof(klass->interfaces_[0]); |
| interfaces_idx.reset(new uint32_t[klass->interface_count_]); |
| memcpy(interfaces_idx.get(), klass->interfaces_, length); |
| memset(klass->interfaces_, 0xFF, length); |
| } |
| // Mark the class as loaded. |
| klass->status_ = Class::kStatusLoaded; |
| if (klass->super_class_idx_ != RawDexFile::kDexNoIndex) { |
| Class* super_class = ResolveClass(klass, klass->super_class_idx_); |
| if (super_class == NULL) { |
| LG << "Failed to resolve superclass"; |
| return false; |
| } |
| klass->super_class_ = super_class; // TODO: write barrier |
| } |
| if (klass->interface_count_ > 0) { |
| for (size_t i = 0; i < klass->interface_count_; ++i) { |
| uint32_t idx = interfaces_idx[i]; |
| klass->interfaces_[i] = ResolveClass(klass, idx); |
| if (klass->interfaces_[i] == NULL) { |
| LG << "Failed to resolve interface"; |
| return false; |
| } |
| // Verify |
| if (!klass->CanAccess(klass->interfaces_[i])) { |
| LG << "Inaccessible interface"; |
| return false; |
| } |
| } |
| } |
| return true; |
| } |
| |
| bool ClassLinker::LinkSuperClass(Class* klass) { |
| CHECK(!klass->IsPrimitive()); |
| const Class* super = klass->GetSuperClass(); |
| if (klass->GetDescriptor() == "Ljava/lang/Object;") { |
| if (super != NULL) { |
| LG << "Superclass must not be defined"; // TODO: ClassFormatError |
| return false; |
| } |
| // TODO: clear finalize attribute |
| return true; |
| } |
| if (super == NULL) { |
| LG << "No superclass defined"; // TODO: LinkageError |
| return false; |
| } |
| // Verify |
| if (super->IsFinal()) { |
| LG << "Superclass is declared final"; // TODO: IncompatibleClassChangeError |
| return false; |
| } |
| if (super->IsInterface()) { |
| LG << "Superclass is an interface"; // TODO: IncompatibleClassChangeError |
| return false; |
| } |
| if (!klass->CanAccess(super)) { |
| LG << "Superclass is inaccessible"; // TODO: IllegalAccessError |
| return false; |
| } |
| return true; |
| } |
| |
| // Populate the class vtable and itable. |
| bool ClassLinker::LinkMethods(Class* klass) { |
| if (klass->IsInterface()) { |
| // No vtable. |
| size_t count = klass->NumVirtualMethods(); |
| if (!IsUint(16, count)) { |
| LG << "Too many methods on interface"; // TODO: VirtualMachineError |
| return false; |
| } |
| for (size_t i = 0; i < count; ++i) { |
| klass->GetVirtualMethod(i)->method_index_ = i; |
| } |
| } else { |
| // Link virtual method tables |
| LinkVirtualMethods(klass); |
| |
| // Link interface method tables |
| LinkInterfaceMethods(klass); |
| |
| // Insert stubs. |
| LinkAbstractMethods(klass); |
| } |
| return true; |
| } |
| |
| bool ClassLinker::LinkVirtualMethods(Class* klass) { |
| uint32_t max_count = klass->NumVirtualMethods(); |
| if (klass->GetSuperClass() != NULL) { |
| max_count += klass->GetSuperClass()->NumVirtualMethods(); |
| } else { |
| CHECK(klass->GetDescriptor() == "Ljava/lang/Object;"); |
| } |
| // TODO: do not assign to the vtable field until it is fully constructed. |
| // TODO: make this a vector<Method*> instead? |
| klass->vtable_ = new Method*[max_count]; |
| if (klass->HasSuperClass()) { |
| memcpy(klass->vtable_, |
| klass->GetSuperClass()->vtable_, |
| klass->GetSuperClass()->vtable_count_ * sizeof(Method*)); |
| size_t actual_count = klass->GetSuperClass()->vtable_count_; |
| // See if any of our virtual methods override the superclass. |
| for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { |
| Method* local_method = klass->GetVirtualMethod(i); |
| size_t j = 0; |
| for (; j < klass->GetSuperClass()->vtable_count_; ++j) { |
| const Method* super_method = klass->vtable_[j]; |
| if (local_method->HasSameNameAndPrototype(super_method)) { |
| // Verify |
| if (super_method->IsFinal()) { |
| LG << "Method overrides final method"; // TODO: VirtualMachineError |
| return false; |
| } |
| klass->vtable_[j] = local_method; |
| local_method->method_index_ = j; |
| break; |
| } |
| } |
| if (j == klass->GetSuperClass()->vtable_count_) { |
| // Not overriding, append. |
| klass->vtable_[actual_count] = local_method; |
| local_method->method_index_ = actual_count; |
| actual_count += 1; |
| } |
| } |
| if (!IsUint(16, actual_count)) { |
| LG << "Too many methods defined on class"; // TODO: VirtualMachineError |
| return false; |
| } |
| CHECK_LE(actual_count, max_count); |
| if (actual_count < max_count) { |
| Method** new_vtable = new Method*[actual_count]; |
| memcpy(new_vtable, klass->vtable_, actual_count * sizeof(Method*)); |
| delete[] klass->vtable_; |
| klass->vtable_ = new_vtable; |
| LG << "shrunk vtable: " |
| << "was " << max_count << ", " |
| << "now " << actual_count; |
| } |
| klass->vtable_count_ = actual_count; |
| } else { |
| CHECK(klass->GetDescriptor() == "Ljava/lang/Object;"); |
| if (!IsUint(16, klass->NumVirtualMethods())) { |
| LG << "Too many methods"; // TODO: VirtualMachineError |
| return false; |
| } |
| for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { |
| klass->vtable_[i] = klass->GetVirtualMethod(i); |
| klass->GetVirtualMethod(i)->method_index_ = i & 0xFFFF; |
| } |
| klass->vtable_count_ = klass->NumVirtualMethods(); |
| } |
| return true; |
| } |
| |
| bool ClassLinker::LinkInterfaceMethods(Class* klass) { |
| int pool_offset = 0; |
| int pool_size = 0; |
| int miranda_count = 0; |
| int miranda_alloc = 0; |
| size_t super_ifcount; |
| if (klass->HasSuperClass()) { |
| super_ifcount = klass->GetSuperClass()->iftable_count_; |
| } else { |
| super_ifcount = 0; |
| } |
| size_t ifCount = super_ifcount; |
| ifCount += klass->interface_count_; |
| for (size_t i = 0; i < klass->interface_count_; i++) { |
| ifCount += klass->interfaces_[i]->iftable_count_; |
| } |
| if (ifCount == 0) { |
| DCHECK(klass->iftable_count_ == 0); |
| DCHECK(klass->iftable_ == NULL); |
| return true; |
| } |
| klass->iftable_ = new InterfaceEntry[ifCount * sizeof(InterfaceEntry)]; |
| memset(klass->iftable_, 0x00, sizeof(InterfaceEntry) * ifCount); |
| if (super_ifcount != 0) { |
| memcpy(klass->iftable_, klass->GetSuperClass()->iftable_, |
| sizeof(InterfaceEntry) * super_ifcount); |
| } |
| // Flatten the interface inheritance hierarchy. |
| size_t idx = super_ifcount; |
| for (size_t i = 0; i < klass->interface_count_; i++) { |
| Class* interf = klass->interfaces_[i]; |
| DCHECK(interf != NULL); |
| if (!interf->IsInterface()) { |
| LG << "Class implements non-interface class"; // TODO: IncompatibleClassChangeError |
| return false; |
| } |
| klass->iftable_[idx++].SetClass(interf); |
| for (size_t j = 0; j < interf->iftable_count_; j++) { |
| klass->iftable_[idx++].SetClass(interf->iftable_[j].GetClass()); |
| } |
| } |
| CHECK_EQ(idx, ifCount); |
| klass->iftable_count_ = ifCount; |
| if (klass->IsInterface() || super_ifcount == ifCount) { |
| return true; |
| } |
| for (size_t i = super_ifcount; i < ifCount; i++) { |
| pool_size += klass->iftable_[i].GetClass()->NumVirtualMethods(); |
| } |
| if (pool_size == 0) { |
| return true; |
| } |
| klass->ifvi_pool_count_ = pool_size; |
| klass->ifvi_pool_ = new uint32_t[pool_size]; |
| std::vector<Method*> miranda_list; |
| for (size_t i = super_ifcount; i < ifCount; ++i) { |
| klass->iftable_[i].method_index_array_ = klass->ifvi_pool_ + pool_offset; |
| Class* interface = klass->iftable_[i].GetClass(); |
| pool_offset += interface->NumVirtualMethods(); // end here |
| for (size_t j = 0; j < interface->NumVirtualMethods(); ++j) { |
| Method* interface_method = interface->GetVirtualMethod(j); |
| int k; // must be signed |
| for (k = klass->vtable_count_ - 1; k >= 0; --k) { |
| if (interface_method->HasSameNameAndPrototype(klass->vtable_[k])) { |
| if (!klass->vtable_[k]->IsPublic()) { |
| LG << "Implementation not public"; |
| return false; |
| } |
| klass->iftable_[i].method_index_array_[j] = k; |
| break; |
| } |
| } |
| if (k < 0) { |
| if (miranda_count == miranda_alloc) { |
| miranda_alloc += 8; |
| if (miranda_list.empty()) { |
| miranda_list.resize(miranda_alloc); |
| } else { |
| miranda_list.resize(miranda_alloc); |
| } |
| } |
| int mir; |
| for (mir = 0; mir < miranda_count; mir++) { |
| if (miranda_list[mir]->HasSameNameAndPrototype(interface_method)) { |
| break; |
| } |
| } |
| // point the interface table at a phantom slot index |
| klass->iftable_[i].method_index_array_[j] = klass->vtable_count_ + mir; |
| if (mir == miranda_count) { |
| miranda_list[miranda_count++] = interface_method; |
| } |
| } |
| } |
| } |
| if (miranda_count != 0) { |
| int oldMethodCount = klass->NumVirtualMethods(); |
| int newMethodCount = oldMethodCount + miranda_count; |
| Method** newVirtualMethods = new Method*[newMethodCount]; |
| if (klass->virtual_methods_ != NULL) { |
| memcpy(newVirtualMethods, |
| klass->virtual_methods_, |
| klass->NumVirtualMethods() * sizeof(Method*)); |
| } |
| klass->virtual_methods_ = newVirtualMethods; |
| klass->num_virtual_methods_ = newMethodCount; |
| |
| CHECK(klass->vtable_ != NULL); |
| int oldVtableCount = klass->vtable_count_; |
| klass->vtable_count_ += miranda_count; |
| |
| for (int i = 0; i < miranda_count; i++) { |
| Method* meth = AllocMethod(); |
| memcpy(meth, miranda_list[i], sizeof(Method)); |
| meth->klass_ = klass; |
| meth->access_flags_ |= kAccMiranda; |
| meth->method_index_ = 0xFFFF & (oldVtableCount + i); |
| klass->virtual_methods_[oldMethodCount+i] = meth; |
| klass->vtable_[oldVtableCount + i] = meth; |
| } |
| } |
| return true; |
| } |
| |
| void ClassLinker::LinkAbstractMethods(Class* klass) { |
| for (size_t i = 0; i < klass->NumVirtualMethods(); ++i) { |
| Method* method = klass->GetVirtualMethod(i); |
| if (method->IsAbstract()) { |
| method->insns_ = reinterpret_cast<uint16_t*>(0xFFFFFFFF); // TODO: AbstractMethodError |
| } |
| } |
| } |
| |
| bool ClassLinker::LinkInstanceFields(Class* klass) { |
| int field_offset; |
| if (klass->GetSuperClass() != NULL) { |
| field_offset = klass->GetSuperClass()->object_size_; |
| } else { |
| field_offset = OFFSETOF_MEMBER(DataObject, fields_); |
| } |
| // Move references to the front. |
| klass->num_reference_ifields_ = 0; |
| size_t i = 0; |
| for ( ; i < klass->NumInstanceFields(); i++) { |
| InstanceField* pField = klass->GetInstanceField(i); |
| char c = pField->GetType(); |
| |
| if (c != '[' && c != 'L') { |
| for (size_t j = klass->NumInstanceFields() - 1; j > i; j--) { |
| InstanceField* refField = klass->GetInstanceField(j); |
| char rc = refField->GetType(); |
| if (rc == '[' || rc == 'L') { |
| klass->SetInstanceField(i, refField); |
| klass->SetInstanceField(j, pField); |
| pField = refField; |
| c = rc; |
| klass->num_reference_ifields_++; |
| break; |
| } |
| } |
| } else { |
| klass->num_reference_ifields_++; |
| } |
| if (c != '[' && c != 'L') { |
| break; |
| } |
| pField->SetOffset(field_offset); |
| field_offset += sizeof(uint32_t); |
| } |
| |
| // Now we want to pack all of the double-wide fields together. If |
| // we're not aligned, though, we want to shuffle one 32-bit field |
| // into place. If we can't find one, we'll have to pad it. |
| if (i != klass->NumInstanceFields() && (field_offset & 0x04) != 0) { |
| InstanceField* pField = klass->GetInstanceField(i); |
| char c = pField->GetType(); |
| |
| if (c != 'J' && c != 'D') { |
| // The field that comes next is 32-bit, so just advance past it. |
| DCHECK(c != '[' && c != 'L'); |
| pField->SetOffset(field_offset); |
| field_offset += sizeof(uint32_t); |
| i++; |
| } else { |
| // Next field is 64-bit, so search for a 32-bit field we can |
| // swap into it. |
| bool found = false; |
| for (size_t j = klass->NumInstanceFields() - 1; j > i; j--) { |
| InstanceField* singleField = klass->GetInstanceField(j); |
| char rc = singleField->GetType(); |
| if (rc != 'J' && rc != 'D') { |
| klass->SetInstanceField(i, singleField); |
| klass->SetInstanceField(j, pField); |
| pField = singleField; |
| pField->SetOffset(field_offset); |
| field_offset += sizeof(uint32_t); |
| found = true; |
| i++; |
| break; |
| } |
| } |
| if (!found) { |
| field_offset += sizeof(uint32_t); |
| } |
| } |
| } |
| |
| // Alignment is good, shuffle any double-wide fields forward, and |
| // finish assigning field offsets to all fields. |
| DCHECK(i == klass->NumInstanceFields() || (field_offset & 0x04) == 0); |
| for ( ; i < klass->NumInstanceFields(); i++) { |
| InstanceField* pField = klass->GetInstanceField(i); |
| char c = pField->GetType(); |
| if (c != 'D' && c != 'J') { |
| for (size_t j = klass->NumInstanceFields() - 1; j > i; j--) { |
| InstanceField* doubleField = klass->GetInstanceField(j); |
| char rc = doubleField->GetType(); |
| if (rc == 'D' || rc == 'J') { |
| klass->SetInstanceField(i, doubleField); |
| klass->SetInstanceField(j, pField); |
| pField = doubleField; |
| c = rc; |
| break; |
| } |
| } |
| } else { |
| // This is a double-wide field, leave it be. |
| } |
| |
| pField->SetOffset(field_offset); |
| field_offset += sizeof(uint32_t); |
| if (c == 'J' || c == 'D') |
| field_offset += sizeof(uint32_t); |
| } |
| |
| #ifndef NDEBUG |
| /* Make sure that all reference fields appear before |
| * non-reference fields, and all double-wide fields are aligned. |
| */ |
| j = 0; // seen non-ref |
| for (i = 0; i < klass->NumInstanceFields(); i++) { |
| InstanceField *pField = &klass->ifields[i]; |
| char c = pField->GetType(); |
| |
| if (c == 'D' || c == 'J') { |
| DCHECK((pField->offset_ & 0x07) == 0); |
| } |
| |
| if (c != '[' && c != 'L') { |
| if (!j) { |
| DCHECK(i == klass->num_reference_ifields_); |
| j = 1; |
| } |
| } else if (j) { |
| DCHECK(false); |
| } |
| } |
| if (!j) { |
| DCHECK(klass->num_reference_ifields_ == klass->NumInstanceFields()); |
| } |
| #endif |
| |
| klass->object_size_ = field_offset; |
| return true; |
| } |
| |
| // Set the bitmap of reference offsets, refOffsets, from the ifields |
| // list. |
| void ClassLinker::CreateReferenceOffsets(Class* klass) { |
| uint32_t reference_offsets = 0; |
| if (klass->HasSuperClass()) { |
| reference_offsets = klass->GetSuperClass()->GetReferenceOffsets(); |
| } |
| // If our superclass overflowed, we don't stand a chance. |
| if (reference_offsets != CLASS_WALK_SUPER) { |
| // All of the fields that contain object references are guaranteed |
| // to be at the beginning of the ifields list. |
| for (size_t i = 0; i < klass->NumReferenceInstanceFields(); ++i) { |
| // Note that, per the comment on struct InstField, f->byteOffset |
| // is the offset from the beginning of obj, not the offset into |
| // obj->instanceData. |
| const InstanceField* field = klass->GetInstanceField(i); |
| size_t byte_offset = field->GetOffset(); |
| CHECK_GE(byte_offset, CLASS_SMALLEST_OFFSET); |
| CHECK_EQ(byte_offset & (CLASS_OFFSET_ALIGNMENT - 1), 0U); |
| if (CLASS_CAN_ENCODE_OFFSET(byte_offset)) { |
| uint32_t new_bit = CLASS_BIT_FROM_OFFSET(byte_offset); |
| CHECK_NE(new_bit, 0U); |
| reference_offsets |= new_bit; |
| } else { |
| reference_offsets = CLASS_WALK_SUPER; |
| break; |
| } |
| } |
| klass->SetReferenceOffsets(reference_offsets); |
| } |
| } |
| |
| Class* ClassLinker::ResolveClass(const Class* referrer, uint32_t class_idx) { |
| DexFile* dex_file = referrer->GetDexFile(); |
| Class* resolved = dex_file->GetResolvedClass(class_idx); |
| if (resolved != NULL) { |
| return resolved; |
| } |
| const char* descriptor = dex_file->GetRaw()->dexStringByTypeIdx(class_idx); |
| if (descriptor[0] != '\0' && descriptor[1] == '\0') { |
| resolved = FindPrimitiveClass(descriptor[0]); |
| } else { |
| resolved = FindClass(descriptor, referrer->GetClassLoader()); |
| } |
| if (resolved != NULL) { |
| Class* check = resolved->IsArray() ? resolved->component_type_ : resolved; |
| if (referrer->GetDexFile() != check->GetDexFile()) { |
| if (check->GetClassLoader() != NULL) { |
| LG << "Class resolved by unexpected DEX"; // TODO: IllegalAccessError |
| return NULL; |
| } |
| } |
| dex_file->SetResolvedClass(resolved, class_idx); |
| } else { |
| DCHECK(Thread::Current()->IsExceptionPending()); |
| } |
| return resolved; |
| } |
| |
| Method* ResolveMethod(const Class* referrer, uint32_t method_idx, |
| /*MethodType*/ int method_type) { |
| CHECK(false); |
| return NULL; |
| } |
| |
| String* ClassLinker::ResolveString(const Class* referring, uint32_t string_idx) { |
| const RawDexFile* raw = referring->GetDexFile()->GetRaw(); |
| const RawDexFile::StringId& string_id = raw->GetStringId(string_idx); |
| const char* string_data = raw->GetStringData(string_id); |
| String* new_string = Heap::AllocStringFromModifiedUtf8(java_lang_String_, char_array_class_, string_data); |
| // TODO: intern the new string |
| referring->GetDexFile()->SetResolvedString(new_string, string_idx); |
| return new_string; |
| } |
| |
| } // namespace art |