src/mirror/class.cc - platform/art - Git at Google

 /*
  * Copyright (C) 2011 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include "class.h"

 #include "abstract_method-inl.h"
 #include "class-inl.h"
 #include "class_linker.h"
 #include "class_loader.h"
 #include "dex_cache.h"
 #include "dex_file-inl.h"
 #include "field-inl.h"
 #include "gc/card_table-inl.h"
 #include "object-inl.h"
 #include "object_array-inl.h"
 #include "object_utils.h"
 #include "runtime.h"
 #include "sirt_ref.h"
 #include "thread.h"
 #include "throwable.h"
 #include "utils.h"
 #include "well_known_classes.h"

 namespace art {
 namespace mirror {

 Class* Class::java_lang_Class_ = NULL;

 void Class::SetClassClass(Class* java_lang_Class) {
   CHECK(java_lang_Class_ == NULL) << java_lang_Class_ << " " << java_lang_Class;
   CHECK(java_lang_Class != NULL);
   java_lang_Class_ = java_lang_Class;
 }

 void Class::ResetClass() {
   CHECK(java_lang_Class_ != NULL);
   java_lang_Class_ = NULL;
 }

 void Class::SetStatus(Status new_status) {
   CHECK(new_status > GetStatus() || new_status == kStatusError || !Runtime::Current()->IsStarted())
       << PrettyClass(this) << " " << GetStatus() << " -> " << new_status;
   CHECK(sizeof(Status) == sizeof(uint32_t)) << PrettyClass(this);
   if (new_status > kStatusResolved) {
     CHECK_EQ(GetThinLockId(), Thread::Current()->GetThinLockId()) << PrettyClass(this);
   }
   if (new_status == kStatusError) {
     CHECK_NE(GetStatus(), kStatusError) << PrettyClass(this);

     // Stash current exception.
     Thread* self = Thread::Current();
     SirtRef<mirror::Object> old_throw_this_object(self, NULL);
     SirtRef<mirror::AbstractMethod> old_throw_method(self, NULL);
     SirtRef<mirror::Throwable> old_exception(self, NULL);
     uint32_t old_throw_dex_pc;
     {
       ThrowLocation old_throw_location;
       mirror::Throwable* old_exception_obj = self->GetException(&old_throw_location);
       old_throw_this_object.reset(old_throw_location.GetThis());
       old_throw_method.reset(old_throw_location.GetMethod());
       old_exception.reset(old_exception_obj);
       old_throw_dex_pc = old_throw_location.GetDexPc();
       self->ClearException();
     }
     CHECK(old_exception.get() != NULL);

     // clear exception to call FindSystemClass
     self->ClearException();
     ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
     Class* eiie_class = class_linker->FindSystemClass("Ljava/lang/ExceptionInInitializerError;");
     CHECK(!self->IsExceptionPending());

     // Only verification errors, not initialization problems, should set a verify error.
     // This is to ensure that ThrowEarlierClassFailure will throw NoClassDefFoundError in that case.
     Class* exception_class = old_exception->GetClass();
     if (!eiie_class->IsAssignableFrom(exception_class)) {
       SetVerifyErrorClass(exception_class);
     }

     // Restore exception.
     ThrowLocation gc_safe_throw_location(old_throw_this_object.get(), old_throw_method.get(),
                                          old_throw_dex_pc);

     self->SetException(gc_safe_throw_location, old_exception.get());
   }
   return SetField32(OFFSET_OF_OBJECT_MEMBER(Class, status_), new_status, false);
 }

 void Class::SetDexCache(DexCache* new_dex_cache) {
   SetFieldObject(OFFSET_OF_OBJECT_MEMBER(Class, dex_cache_), new_dex_cache, false);
 }

 Object* Class::AllocObject(Thread* self) {
   DCHECK(!IsArrayClass()) << PrettyClass(this);
   DCHECK(IsInstantiable()) << PrettyClass(this);
   // TODO: decide whether we want this check. It currently fails during bootstrap.
   // DCHECK(!Runtime::Current()->IsStarted() || IsInitializing()) << PrettyClass(this);
   DCHECK_GE(this->object_size_, sizeof(Object));
   return Runtime::Current()->GetHeap()->AllocObject(self, this, this->object_size_);
 }

 void Class::SetClassSize(size_t new_class_size) {
   DCHECK_GE(new_class_size, GetClassSize()) << " class=" << PrettyTypeOf(this);
   SetField32(OFFSET_OF_OBJECT_MEMBER(Class, class_size_), new_class_size, false);
 }

 // Return the class' name. The exact format is bizarre, but it's the specified behavior for
 // Class.getName: keywords for primitive types, regular "[I" form for primitive arrays (so "int"
 // but "[I"), and arrays of reference types written between "L" and ";" but with dots rather than
 // slashes (so "java.lang.String" but "[Ljava.lang.String;"). Madness.
 String* Class::ComputeName() {
   String* name = GetName();
   if (name != NULL) {
     return name;
   }
   std::string descriptor(ClassHelper(this).GetDescriptor());
   if ((descriptor[0] != 'L') && (descriptor[0] != '[')) {
     // The descriptor indicates that this is the class for
     // a primitive type; special-case the return value.
     const char* c_name = NULL;
     switch (descriptor[0]) {
     case 'Z': c_name = "boolean"; break;
     case 'B': c_name = "byte";    break;
     case 'C': c_name = "char";    break;
     case 'S': c_name = "short";   break;
     case 'I': c_name = "int";     break;
     case 'J': c_name = "long";    break;
     case 'F': c_name = "float";   break;
     case 'D': c_name = "double";  break;
     case 'V': c_name = "void";    break;
     default:
       LOG(FATAL) << "Unknown primitive type: " << PrintableChar(descriptor[0]);
     }
     name = String::AllocFromModifiedUtf8(Thread::Current(), c_name);
   } else {
     // Convert the UTF-8 name to a java.lang.String. The name must use '.' to separate package
     // components.
     if (descriptor.size() > 2 && descriptor[0] == 'L' && descriptor[descriptor.size() - 1] == ';') {
       descriptor.erase(0, 1);
       descriptor.erase(descriptor.size() - 1);
     }
     std::replace(descriptor.begin(), descriptor.end(), '/', '.');
     name = String::AllocFromModifiedUtf8(Thread::Current(), descriptor.c_str());
   }
   SetName(name);
   return name;
 }

 void Class::DumpClass(std::ostream& os, int flags) const {
   if ((flags & kDumpClassFullDetail) == 0) {
     os << PrettyClass(this);
     if ((flags & kDumpClassClassLoader) != 0) {
       os << ' ' << GetClassLoader();
     }
     if ((flags & kDumpClassInitialized) != 0) {
       os << ' ' << GetStatus();
     }
     os << "\n";
     return;
   }

   Class* super = GetSuperClass();
   ClassHelper kh(this);
   os << "----- " << (IsInterface() ? "interface" : "class") << " "
      << "'" << kh.GetDescriptor() << "' cl=" << GetClassLoader() << " -----\n",
   os << "  objectSize=" << SizeOf() << " "
      << "(" << (super != NULL ? super->SizeOf() : -1) << " from super)\n",
   os << StringPrintf("  access=0x%04x.%04x\n",
       GetAccessFlags() >> 16, GetAccessFlags() & kAccJavaFlagsMask);
   if (super != NULL) {
     os << "  super='" << PrettyClass(super) << "' (cl=" << super->GetClassLoader() << ")\n";
   }
   if (IsArrayClass()) {
     os << "  componentType=" << PrettyClass(GetComponentType()) << "\n";
   }
   if (kh.NumDirectInterfaces() > 0) {
     os << "  interfaces (" << kh.NumDirectInterfaces() << "):\n";
     for (size_t i = 0; i < kh.NumDirectInterfaces(); ++i) {
       Class* interface = kh.GetDirectInterface(i);
       const ClassLoader* cl = interface->GetClassLoader();
       os << StringPrintf("    %2zd: %s (cl=%p)\n", i, PrettyClass(interface).c_str(), cl);
     }
   }
   os << "  vtable (" << NumVirtualMethods() << " entries, "
      << (super != NULL ? super->NumVirtualMethods() : 0) << " in super):\n";
   for (size_t i = 0; i < NumVirtualMethods(); ++i) {
     os << StringPrintf("    %2zd: %s\n", i, PrettyMethod(GetVirtualMethodDuringLinking(i)).c_str());
   }
   os << "  direct methods (" << NumDirectMethods() << " entries):\n";
   for (size_t i = 0; i < NumDirectMethods(); ++i) {
     os << StringPrintf("    %2zd: %s\n", i, PrettyMethod(GetDirectMethod(i)).c_str());
   }
   if (NumStaticFields() > 0) {
     os << "  static fields (" << NumStaticFields() << " entries):\n";
     if (IsResolved() || IsErroneous()) {
       for (size_t i = 0; i < NumStaticFields(); ++i) {
         os << StringPrintf("    %2zd: %s\n", i, PrettyField(GetStaticField(i)).c_str());
       }
     } else {
       os << "    <not yet available>";
     }
   }
   if (NumInstanceFields() > 0) {
     os << "  instance fields (" << NumInstanceFields() << " entries):\n";
     if (IsResolved() || IsErroneous()) {
       for (size_t i = 0; i < NumInstanceFields(); ++i) {
         os << StringPrintf("    %2zd: %s\n", i, PrettyField(GetInstanceField(i)).c_str());
       }
     } else {
       os << "    <not yet available>";
     }
   }
 }

 void Class::SetReferenceInstanceOffsets(uint32_t new_reference_offsets) {
   if (new_reference_offsets != CLASS_WALK_SUPER) {
     // Sanity check that the number of bits set in the reference offset bitmap
     // agrees with the number of references
     size_t count = 0;
     for (Class* c = this; c != NULL; c = c->GetSuperClass()) {
       count += c->NumReferenceInstanceFieldsDuringLinking();
     }
     CHECK_EQ((size_t)__builtin_popcount(new_reference_offsets), count);
   }
   SetField32(OFFSET_OF_OBJECT_MEMBER(Class, reference_instance_offsets_),
              new_reference_offsets, false);
 }

 void Class::SetReferenceStaticOffsets(uint32_t new_reference_offsets) {
   if (new_reference_offsets != CLASS_WALK_SUPER) {
     // Sanity check that the number of bits set in the reference offset bitmap
     // agrees with the number of references
     CHECK_EQ((size_t)__builtin_popcount(new_reference_offsets),
              NumReferenceStaticFieldsDuringLinking());
   }
   SetField32(OFFSET_OF_OBJECT_MEMBER(Class, reference_static_offsets_),
              new_reference_offsets, false);
 }

 bool Class::IsInSamePackage(const StringPiece& descriptor1, const StringPiece& descriptor2) {
   size_t i = 0;
   while (descriptor1[i] != '\0' && descriptor1[i] == descriptor2[i]) {
     ++i;
   }
   if (descriptor1.find('/', i) != StringPiece::npos ||
       descriptor2.find('/', i) != StringPiece::npos) {
     return false;
   } else {
     return true;
   }
 }

 bool Class::IsInSamePackage(const Class* that) const {
   const Class* klass1 = this;
   const Class* klass2 = that;
   if (klass1 == klass2) {
     return true;
   }
   // Class loaders must match.
   if (klass1->GetClassLoader() != klass2->GetClassLoader()) {
     return false;
   }
   // Arrays are in the same package when their element classes are.
   while (klass1->IsArrayClass()) {
     klass1 = klass1->GetComponentType();
   }
   while (klass2->IsArrayClass()) {
     klass2 = klass2->GetComponentType();
   }
   // trivial check again for array types
   if (klass1 == klass2) {
     return true;
   }
   // Compare the package part of the descriptor string.
   if (LIKELY(!klass1->IsProxyClass() && !klass2->IsProxyClass())) {
     ClassHelper kh(klass1);
     const DexFile* dex_file1 = &kh.GetDexFile();
     const DexFile::TypeId* type_id1 = &dex_file1->GetTypeId(klass1->GetDexTypeIndex());
     const char* descriptor1 = dex_file1->GetTypeDescriptor(*type_id1);
     kh.ChangeClass(klass2);
     const DexFile* dex_file2 = &kh.GetDexFile();
     const DexFile::TypeId* type_id2 = &dex_file2->GetTypeId(klass2->GetDexTypeIndex());
     const char* descriptor2 = dex_file2->GetTypeDescriptor(*type_id2);
     return IsInSamePackage(descriptor1, descriptor2);
   }
   ClassHelper kh(klass1);
   std::string descriptor1(kh.GetDescriptor());
   kh.ChangeClass(klass2);
   std::string descriptor2(kh.GetDescriptor());
   return IsInSamePackage(descriptor1, descriptor2);
 }

 bool Class::IsClassClass() const {
   Class* java_lang_Class = GetClass()->GetClass();
   return this == java_lang_Class;
 }

 bool Class::IsStringClass() const {
   return this == String::GetJavaLangString();
 }

 bool Class::IsThrowableClass() const {
   return WellKnownClasses::ToClass(WellKnownClasses::java_lang_Throwable)->IsAssignableFrom(this);
 }

 bool Class::IsFieldClass() const {
   Class* java_lang_Class = GetClass();
   Class* java_lang_reflect_Field = java_lang_Class->GetInstanceField(0)->GetClass();
   return this == java_lang_reflect_Field;

 }

 bool Class::IsMethodClass() const {
   return (this == AbstractMethod::GetMethodClass()) ||
       (this == AbstractMethod::GetConstructorClass());

 }

 void Class::SetClassLoader(ClassLoader* new_class_loader) {
   SetFieldObject(OFFSET_OF_OBJECT_MEMBER(Class, class_loader_), new_class_loader, false);
 }

 AbstractMethod* Class::FindInterfaceMethod(const StringPiece& name, const StringPiece& signature) const {
   // Check the current class before checking the interfaces.
   AbstractMethod* method = FindDeclaredVirtualMethod(name, signature);
   if (method != NULL) {
     return method;
   }

   int32_t iftable_count = GetIfTableCount();
   IfTable* iftable = GetIfTable();
   for (int32_t i = 0; i < iftable_count; i++) {
     method = iftable->GetInterface(i)->FindDeclaredVirtualMethod(name, signature);
     if (method != NULL) {
       return method;
     }
   }
   return NULL;
 }

 AbstractMethod* Class::FindInterfaceMethod(const DexCache* dex_cache, uint32_t dex_method_idx) const {
   // Check the current class before checking the interfaces.
   AbstractMethod* method = FindDeclaredVirtualMethod(dex_cache, dex_method_idx);
   if (method != NULL) {
     return method;
   }

   int32_t iftable_count = GetIfTableCount();
   IfTable* iftable = GetIfTable();
   for (int32_t i = 0; i < iftable_count; i++) {
     method = iftable->GetInterface(i)->FindDeclaredVirtualMethod(dex_cache, dex_method_idx);
     if (method != NULL) {
       return method;
     }
   }
   return NULL;
 }


 AbstractMethod* Class::FindDeclaredDirectMethod(const StringPiece& name, const StringPiece& signature) const {
   MethodHelper mh;
   for (size_t i = 0; i < NumDirectMethods(); ++i) {
     AbstractMethod* method = GetDirectMethod(i);
     mh.ChangeMethod(method);
     if (name == mh.GetName() && signature == mh.GetSignature()) {
       return method;
     }
   }
   return NULL;
 }

 AbstractMethod* Class::FindDeclaredDirectMethod(const DexCache* dex_cache, uint32_t dex_method_idx) const {
   if (GetDexCache() == dex_cache) {
     for (size_t i = 0; i < NumDirectMethods(); ++i) {
       AbstractMethod* method = GetDirectMethod(i);
       if (method->GetDexMethodIndex() == dex_method_idx) {
         return method;
       }
     }
   }
   return NULL;
 }

 AbstractMethod* Class::FindDirectMethod(const StringPiece& name, const StringPiece& signature) const {
   for (const Class* klass = this; klass != NULL; klass = klass->GetSuperClass()) {
     AbstractMethod* method = klass->FindDeclaredDirectMethod(name, signature);
     if (method != NULL) {
       return method;
     }
   }
   return NULL;
 }

 AbstractMethod* Class::FindDirectMethod(const DexCache* dex_cache, uint32_t dex_method_idx) const {
   for (const Class* klass = this; klass != NULL; klass = klass->GetSuperClass()) {
     AbstractMethod* method = klass->FindDeclaredDirectMethod(dex_cache, dex_method_idx);
     if (method != NULL) {
       return method;
     }
   }
   return NULL;
 }

 AbstractMethod* Class::FindDeclaredVirtualMethod(const StringPiece& name,
                                          const StringPiece& signature) const {
   MethodHelper mh;
   for (size_t i = 0; i < NumVirtualMethods(); ++i) {
     AbstractMethod* method = GetVirtualMethod(i);
     mh.ChangeMethod(method);
     if (name == mh.GetName() && signature == mh.GetSignature()) {
       return method;
     }
   }
   return NULL;
 }

 AbstractMethod* Class::FindDeclaredVirtualMethod(const DexCache* dex_cache, uint32_t dex_method_idx) const {
   if (GetDexCache() == dex_cache) {
     for (size_t i = 0; i < NumVirtualMethods(); ++i) {
       AbstractMethod* method = GetVirtualMethod(i);
       if (method->GetDexMethodIndex() == dex_method_idx) {
         return method;
       }
     }
   }
   return NULL;
 }

 AbstractMethod* Class::FindVirtualMethod(const StringPiece& name, const StringPiece& signature) const {
   for (const Class* klass = this; klass != NULL; klass = klass->GetSuperClass()) {
     AbstractMethod* method = klass->FindDeclaredVirtualMethod(name, signature);
     if (method != NULL) {
       return method;
     }
   }
   return NULL;
 }

 AbstractMethod* Class::FindVirtualMethod(const DexCache* dex_cache, uint32_t dex_method_idx) const {
   for (const Class* klass = this; klass != NULL; klass = klass->GetSuperClass()) {
     AbstractMethod* method = klass->FindDeclaredVirtualMethod(dex_cache, dex_method_idx);
     if (method != NULL) {
       return method;
     }
   }
   return NULL;
 }

 Field* Class::FindDeclaredInstanceField(const StringPiece& name, const StringPiece& type) {
   // Is the field in this class?
   // Interfaces are not relevant because they can't contain instance fields.
   FieldHelper fh;
   for (size_t i = 0; i < NumInstanceFields(); ++i) {
     Field* f = GetInstanceField(i);
     fh.ChangeField(f);
     if (name == fh.GetName() && type == fh.GetTypeDescriptor()) {
       return f;
     }
   }
   return NULL;
 }

 Field* Class::FindDeclaredInstanceField(const DexCache* dex_cache, uint32_t dex_field_idx) {
   if (GetDexCache() == dex_cache) {
     for (size_t i = 0; i < NumInstanceFields(); ++i) {
       Field* f = GetInstanceField(i);
       if (f->GetDexFieldIndex() == dex_field_idx) {
         return f;
       }
     }
   }
   return NULL;
 }

 Field* Class::FindInstanceField(const StringPiece& name, const StringPiece& type) {
   // Is the field in this class, or any of its superclasses?
   // Interfaces are not relevant because they can't contain instance fields.
   for (Class* c = this; c != NULL; c = c->GetSuperClass()) {
     Field* f = c->FindDeclaredInstanceField(name, type);
     if (f != NULL) {
       return f;
     }
   }
   return NULL;
 }

 Field* Class::FindInstanceField(const DexCache* dex_cache, uint32_t dex_field_idx) {
   // Is the field in this class, or any of its superclasses?
   // Interfaces are not relevant because they can't contain instance fields.
   for (Class* c = this; c != NULL; c = c->GetSuperClass()) {
     Field* f = c->FindDeclaredInstanceField(dex_cache, dex_field_idx);
     if (f != NULL) {
       return f;
     }
   }
   return NULL;
 }

 Field* Class::FindDeclaredStaticField(const StringPiece& name, const StringPiece& type) {
   DCHECK(type != NULL);
   FieldHelper fh;
   for (size_t i = 0; i < NumStaticFields(); ++i) {
     Field* f = GetStaticField(i);
     fh.ChangeField(f);
     if (name == fh.GetName() && type == fh.GetTypeDescriptor()) {
       return f;
     }
   }
   return NULL;
 }

 Field* Class::FindDeclaredStaticField(const DexCache* dex_cache, uint32_t dex_field_idx) {
   if (dex_cache == GetDexCache()) {
     for (size_t i = 0; i < NumStaticFields(); ++i) {
       Field* f = GetStaticField(i);
       if (f->GetDexFieldIndex() == dex_field_idx) {
         return f;
       }
     }
   }
   return NULL;
 }

 Field* Class::FindStaticField(const StringPiece& name, const StringPiece& type) {
   // Is the field in this class (or its interfaces), or any of its
   // superclasses (or their interfaces)?
   ClassHelper kh;
   for (Class* k = this; k != NULL; k = k->GetSuperClass()) {
     // Is the field in this class?
     Field* f = k->FindDeclaredStaticField(name, type);
     if (f != NULL) {
       return f;
     }
     // Is this field in any of this class' interfaces?
     kh.ChangeClass(k);
     for (uint32_t i = 0; i < kh.NumDirectInterfaces(); ++i) {
       Class* interface = kh.GetDirectInterface(i);
       f = interface->FindStaticField(name, type);
       if (f != NULL) {
         return f;
       }
     }
   }
   return NULL;
 }

 Field* Class::FindStaticField(const DexCache* dex_cache, uint32_t dex_field_idx) {
   ClassHelper kh;
   for (Class* k = this; k != NULL; k = k->GetSuperClass()) {
     // Is the field in this class?
     Field* f = k->FindDeclaredStaticField(dex_cache, dex_field_idx);
     if (f != NULL) {
       return f;
     }
     // Is this field in any of this class' interfaces?
     kh.ChangeClass(k);
     for (uint32_t i = 0; i < kh.NumDirectInterfaces(); ++i) {
       Class* interface = kh.GetDirectInterface(i);
       f = interface->FindStaticField(dex_cache, dex_field_idx);
       if (f != NULL) {
         return f;
       }
     }
   }
   return NULL;
 }

 Field* Class::FindField(const StringPiece& name, const StringPiece& type) {
   // Find a field using the JLS field resolution order
   ClassHelper kh;
   for (Class* k = this; k != NULL; k = k->GetSuperClass()) {
     // Is the field in this class?
     Field* f = k->FindDeclaredInstanceField(name, type);
     if (f != NULL) {
       return f;
     }
     f = k->FindDeclaredStaticField(name, type);
     if (f != NULL) {
       return f;
     }
     // Is this field in any of this class' interfaces?
     kh.ChangeClass(k);
     for (uint32_t i = 0; i < kh.NumDirectInterfaces(); ++i) {
       Class* interface = kh.GetDirectInterface(i);
       f = interface->FindStaticField(name, type);
       if (f != NULL) {
         return f;
       }
     }
   }
   return NULL;
 }

 }  // namespace mirror
 }  // namespace art
	/*
	* Copyright (C) 2011 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include "class.h"

	#include "abstract_method-inl.h"
	#include "class-inl.h"
	#include "class_linker.h"
	#include "class_loader.h"
	#include "dex_cache.h"
	#include "dex_file-inl.h"
	#include "field-inl.h"
	#include "gc/card_table-inl.h"
	#include "object-inl.h"
	#include "object_array-inl.h"
	#include "object_utils.h"
	#include "runtime.h"
	#include "sirt_ref.h"
	#include "thread.h"
	#include "throwable.h"
	#include "utils.h"
	#include "well_known_classes.h"

	namespace art {
	namespace mirror {

	Class* Class::java_lang_Class_ = NULL;

	void Class::SetClassClass(Class* java_lang_Class) {
	CHECK(java_lang_Class_ == NULL) << java_lang_Class_ << " " << java_lang_Class;
	CHECK(java_lang_Class != NULL);
	java_lang_Class_ = java_lang_Class;
	}

	void Class::ResetClass() {
	CHECK(java_lang_Class_ != NULL);
	java_lang_Class_ = NULL;
	}

	void Class::SetStatus(Status new_status) {
	CHECK(new_status > GetStatus() \|\| new_status == kStatusError \|\| !Runtime::Current()->IsStarted())
	<< PrettyClass(this) << " " << GetStatus() << " -> " << new_status;
	CHECK(sizeof(Status) == sizeof(uint32_t)) << PrettyClass(this);
	if (new_status > kStatusResolved) {
	CHECK_EQ(GetThinLockId(), Thread::Current()->GetThinLockId()) << PrettyClass(this);
	}
	if (new_status == kStatusError) {
	CHECK_NE(GetStatus(), kStatusError) << PrettyClass(this);

	// Stash current exception.
	Thread* self = Thread::Current();
	SirtRef<mirror::Object> old_throw_this_object(self, NULL);
	SirtRef<mirror::AbstractMethod> old_throw_method(self, NULL);
	SirtRef<mirror::Throwable> old_exception(self, NULL);
	uint32_t old_throw_dex_pc;
	{
	ThrowLocation old_throw_location;
	mirror::Throwable* old_exception_obj = self->GetException(&old_throw_location);
	old_throw_this_object.reset(old_throw_location.GetThis());
	old_throw_method.reset(old_throw_location.GetMethod());
	old_exception.reset(old_exception_obj);
	old_throw_dex_pc = old_throw_location.GetDexPc();
	self->ClearException();
	}
	CHECK(old_exception.get() != NULL);

	// clear exception to call FindSystemClass
	self->ClearException();
	ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
	Class* eiie_class = class_linker->FindSystemClass("Ljava/lang/ExceptionInInitializerError;");
	CHECK(!self->IsExceptionPending());

	// Only verification errors, not initialization problems, should set a verify error.
	// This is to ensure that ThrowEarlierClassFailure will throw NoClassDefFoundError in that case.
	Class* exception_class = old_exception->GetClass();
	if (!eiie_class->IsAssignableFrom(exception_class)) {
	SetVerifyErrorClass(exception_class);
	}

	// Restore exception.
	ThrowLocation gc_safe_throw_location(old_throw_this_object.get(), old_throw_method.get(),
	old_throw_dex_pc);

	self->SetException(gc_safe_throw_location, old_exception.get());
	}
	return SetField32(OFFSET_OF_OBJECT_MEMBER(Class, status_), new_status, false);
	}

	void Class::SetDexCache(DexCache* new_dex_cache) {
	SetFieldObject(OFFSET_OF_OBJECT_MEMBER(Class, dex_cache_), new_dex_cache, false);
	}

	Object* Class::AllocObject(Thread* self) {
	DCHECK(!IsArrayClass()) << PrettyClass(this);
	DCHECK(IsInstantiable()) << PrettyClass(this);
	// TODO: decide whether we want this check. It currently fails during bootstrap.
	// DCHECK(!Runtime::Current()->IsStarted() \|\| IsInitializing()) << PrettyClass(this);
	DCHECK_GE(this->object_size_, sizeof(Object));
	return Runtime::Current()->GetHeap()->AllocObject(self, this, this->object_size_);
	}

	void Class::SetClassSize(size_t new_class_size) {
	DCHECK_GE(new_class_size, GetClassSize()) << " class=" << PrettyTypeOf(this);
	SetField32(OFFSET_OF_OBJECT_MEMBER(Class, class_size_), new_class_size, false);
	}

	// Return the class' name. The exact format is bizarre, but it's the specified behavior for
	// Class.getName: keywords for primitive types, regular "[I" form for primitive arrays (so "int"
	// but "[I"), and arrays of reference types written between "L" and ";" but with dots rather than
	// slashes (so "java.lang.String" but "[Ljava.lang.String;"). Madness.
	String* Class::ComputeName() {
	String* name = GetName();
	if (name != NULL) {
	return name;
	}
	std::string descriptor(ClassHelper(this).GetDescriptor());
	if ((descriptor[0] != 'L') && (descriptor[0] != '[')) {
	// The descriptor indicates that this is the class for
	// a primitive type; special-case the return value.
	const char* c_name = NULL;
	switch (descriptor[0]) {
	case 'Z': c_name = "boolean"; break;
	case 'B': c_name = "byte"; break;
	case 'C': c_name = "char"; break;
	case 'S': c_name = "short"; break;
	case 'I': c_name = "int"; break;
	case 'J': c_name = "long"; break;
	case 'F': c_name = "float"; break;
	case 'D': c_name = "double"; break;
	case 'V': c_name = "void"; break;
	default:
	LOG(FATAL) << "Unknown primitive type: " << PrintableChar(descriptor[0]);
	}
	name = String::AllocFromModifiedUtf8(Thread::Current(), c_name);
	} else {
	// Convert the UTF-8 name to a java.lang.String. The name must use '.' to separate package
	// components.
	if (descriptor.size() > 2 && descriptor[0] == 'L' && descriptor[descriptor.size() - 1] == ';') {
	descriptor.erase(0, 1);
	descriptor.erase(descriptor.size() - 1);
	}
	std::replace(descriptor.begin(), descriptor.end(), '/', '.');
	name = String::AllocFromModifiedUtf8(Thread::Current(), descriptor.c_str());
	}
	SetName(name);
	return name;
	}

	void Class::DumpClass(std::ostream& os, int flags) const {
	if ((flags & kDumpClassFullDetail) == 0) {
	os << PrettyClass(this);
	if ((flags & kDumpClassClassLoader) != 0) {
	os << ' ' << GetClassLoader();
	}
	if ((flags & kDumpClassInitialized) != 0) {
	os << ' ' << GetStatus();
	}
	os << "\n";
	return;
	}

	Class* super = GetSuperClass();
	ClassHelper kh(this);
	os << "----- " << (IsInterface() ? "interface" : "class") << " "
	<< "'" << kh.GetDescriptor() << "' cl=" << GetClassLoader() << " -----\n",
	os << " objectSize=" << SizeOf() << " "
	<< "(" << (super != NULL ? super->SizeOf() : -1) << " from super)\n",
	os << StringPrintf(" access=0x%04x.%04x\n",
	GetAccessFlags() >> 16, GetAccessFlags() & kAccJavaFlagsMask);
	if (super != NULL) {
	os << " super='" << PrettyClass(super) << "' (cl=" << super->GetClassLoader() << ")\n";
	}
	if (IsArrayClass()) {
	os << " componentType=" << PrettyClass(GetComponentType()) << "\n";
	}
	if (kh.NumDirectInterfaces() > 0) {
	os << " interfaces (" << kh.NumDirectInterfaces() << "):\n";
	for (size_t i = 0; i < kh.NumDirectInterfaces(); ++i) {
	Class* interface = kh.GetDirectInterface(i);
	const ClassLoader* cl = interface->GetClassLoader();
	os << StringPrintf(" %2zd: %s (cl=%p)\n", i, PrettyClass(interface).c_str(), cl);
	}
	}
	os << " vtable (" << NumVirtualMethods() << " entries, "
	<< (super != NULL ? super->NumVirtualMethods() : 0) << " in super):\n";
	for (size_t i = 0; i < NumVirtualMethods(); ++i) {
	os << StringPrintf(" %2zd: %s\n", i, PrettyMethod(GetVirtualMethodDuringLinking(i)).c_str());
	}
	os << " direct methods (" << NumDirectMethods() << " entries):\n";
	for (size_t i = 0; i < NumDirectMethods(); ++i) {
	os << StringPrintf(" %2zd: %s\n", i, PrettyMethod(GetDirectMethod(i)).c_str());
	}
	if (NumStaticFields() > 0) {
	os << " static fields (" << NumStaticFields() << " entries):\n";
	if (IsResolved() \|\| IsErroneous()) {
	for (size_t i = 0; i < NumStaticFields(); ++i) {
	os << StringPrintf(" %2zd: %s\n", i, PrettyField(GetStaticField(i)).c_str());
	}
	} else {
	os << " <not yet available>";
	}
	}
	if (NumInstanceFields() > 0) {
	os << " instance fields (" << NumInstanceFields() << " entries):\n";
	if (IsResolved() \|\| IsErroneous()) {
	for (size_t i = 0; i < NumInstanceFields(); ++i) {
	os << StringPrintf(" %2zd: %s\n", i, PrettyField(GetInstanceField(i)).c_str());
	}
	} else {
	os << " <not yet available>";
	}
	}
	}

	void Class::SetReferenceInstanceOffsets(uint32_t new_reference_offsets) {
	if (new_reference_offsets != CLASS_WALK_SUPER) {
	// Sanity check that the number of bits set in the reference offset bitmap
	// agrees with the number of references
	size_t count = 0;
	for (Class* c = this; c != NULL; c = c->GetSuperClass()) {
	count += c->NumReferenceInstanceFieldsDuringLinking();
	}
	CHECK_EQ((size_t)__builtin_popcount(new_reference_offsets), count);
	}
	SetField32(OFFSET_OF_OBJECT_MEMBER(Class, reference_instance_offsets_),
	new_reference_offsets, false);
	}

	void Class::SetReferenceStaticOffsets(uint32_t new_reference_offsets) {
	if (new_reference_offsets != CLASS_WALK_SUPER) {
	// Sanity check that the number of bits set in the reference offset bitmap
	// agrees with the number of references
	CHECK_EQ((size_t)__builtin_popcount(new_reference_offsets),
	NumReferenceStaticFieldsDuringLinking());
	}
	SetField32(OFFSET_OF_OBJECT_MEMBER(Class, reference_static_offsets_),
	new_reference_offsets, false);
	}

	bool Class::IsInSamePackage(const StringPiece& descriptor1, const StringPiece& descriptor2) {
	size_t i = 0;
	while (descriptor1[i] != '\0' && descriptor1[i] == descriptor2[i]) {
	++i;
	}
	if (descriptor1.find('/', i) != StringPiece::npos \|\|
	descriptor2.find('/', i) != StringPiece::npos) {
	return false;
	} else {
	return true;
	}
	}

	bool Class::IsInSamePackage(const Class* that) const {
	const Class* klass1 = this;
	const Class* klass2 = that;
	if (klass1 == klass2) {
	return true;
	}
	// Class loaders must match.
	if (klass1->GetClassLoader() != klass2->GetClassLoader()) {
	return false;
	}
	// Arrays are in the same package when their element classes are.
	while (klass1->IsArrayClass()) {
	klass1 = klass1->GetComponentType();
	}
	while (klass2->IsArrayClass()) {
	klass2 = klass2->GetComponentType();
	}
	// trivial check again for array types
	if (klass1 == klass2) {
	return true;
	}
	// Compare the package part of the descriptor string.
	if (LIKELY(!klass1->IsProxyClass() && !klass2->IsProxyClass())) {
	ClassHelper kh(klass1);
	const DexFile* dex_file1 = &kh.GetDexFile();
	const DexFile::TypeId* type_id1 = &dex_file1->GetTypeId(klass1->GetDexTypeIndex());
	const char* descriptor1 = dex_file1->GetTypeDescriptor(*type_id1);
	kh.ChangeClass(klass2);
	const DexFile* dex_file2 = &kh.GetDexFile();
	const DexFile::TypeId* type_id2 = &dex_file2->GetTypeId(klass2->GetDexTypeIndex());
	const char* descriptor2 = dex_file2->GetTypeDescriptor(*type_id2);
	return IsInSamePackage(descriptor1, descriptor2);
	}
	ClassHelper kh(klass1);
	std::string descriptor1(kh.GetDescriptor());
	kh.ChangeClass(klass2);
	std::string descriptor2(kh.GetDescriptor());
	return IsInSamePackage(descriptor1, descriptor2);
	}

	bool Class::IsClassClass() const {
	Class* java_lang_Class = GetClass()->GetClass();
	return this == java_lang_Class;
	}

	bool Class::IsStringClass() const {
	return this == String::GetJavaLangString();
	}

	bool Class::IsThrowableClass() const {
	return WellKnownClasses::ToClass(WellKnownClasses::java_lang_Throwable)->IsAssignableFrom(this);
	}

	bool Class::IsFieldClass() const {
	Class* java_lang_Class = GetClass();
	Class* java_lang_reflect_Field = java_lang_Class->GetInstanceField(0)->GetClass();
	return this == java_lang_reflect_Field;

	}

	bool Class::IsMethodClass() const {
	return (this == AbstractMethod::GetMethodClass()) \|\|
	(this == AbstractMethod::GetConstructorClass());

	}

	void Class::SetClassLoader(ClassLoader* new_class_loader) {
	SetFieldObject(OFFSET_OF_OBJECT_MEMBER(Class, class_loader_), new_class_loader, false);
	}

	AbstractMethod* Class::FindInterfaceMethod(const StringPiece& name, const StringPiece& signature) const {
	// Check the current class before checking the interfaces.
	AbstractMethod* method = FindDeclaredVirtualMethod(name, signature);
	if (method != NULL) {
	return method;
	}

	int32_t iftable_count = GetIfTableCount();
	IfTable* iftable = GetIfTable();
	for (int32_t i = 0; i < iftable_count; i++) {
	method = iftable->GetInterface(i)->FindDeclaredVirtualMethod(name, signature);
	if (method != NULL) {
	return method;
	}
	}
	return NULL;
	}

	AbstractMethod* Class::FindInterfaceMethod(const DexCache* dex_cache, uint32_t dex_method_idx) const {
	// Check the current class before checking the interfaces.
	AbstractMethod* method = FindDeclaredVirtualMethod(dex_cache, dex_method_idx);
	if (method != NULL) {
	return method;
	}

	int32_t iftable_count = GetIfTableCount();
	IfTable* iftable = GetIfTable();
	for (int32_t i = 0; i < iftable_count; i++) {
	method = iftable->GetInterface(i)->FindDeclaredVirtualMethod(dex_cache, dex_method_idx);
	if (method != NULL) {
	return method;
	}
	}
	return NULL;
	}


	AbstractMethod* Class::FindDeclaredDirectMethod(const StringPiece& name, const StringPiece& signature) const {
	MethodHelper mh;
	for (size_t i = 0; i < NumDirectMethods(); ++i) {
	AbstractMethod* method = GetDirectMethod(i);
	mh.ChangeMethod(method);
	if (name == mh.GetName() && signature == mh.GetSignature()) {
	return method;
	}
	}
	return NULL;
	}

	AbstractMethod* Class::FindDeclaredDirectMethod(const DexCache* dex_cache, uint32_t dex_method_idx) const {
	if (GetDexCache() == dex_cache) {
	for (size_t i = 0; i < NumDirectMethods(); ++i) {
	AbstractMethod* method = GetDirectMethod(i);
	if (method->GetDexMethodIndex() == dex_method_idx) {
	return method;
	}
	}
	}
	return NULL;
	}

	AbstractMethod* Class::FindDirectMethod(const StringPiece& name, const StringPiece& signature) const {
	for (const Class* klass = this; klass != NULL; klass = klass->GetSuperClass()) {
	AbstractMethod* method = klass->FindDeclaredDirectMethod(name, signature);
	if (method != NULL) {
	return method;
	}
	}
	return NULL;
	}

	AbstractMethod* Class::FindDirectMethod(const DexCache* dex_cache, uint32_t dex_method_idx) const {
	for (const Class* klass = this; klass != NULL; klass = klass->GetSuperClass()) {
	AbstractMethod* method = klass->FindDeclaredDirectMethod(dex_cache, dex_method_idx);
	if (method != NULL) {
	return method;
	}
	}
	return NULL;
	}

	AbstractMethod* Class::FindDeclaredVirtualMethod(const StringPiece& name,
	const StringPiece& signature) const {
	MethodHelper mh;
	for (size_t i = 0; i < NumVirtualMethods(); ++i) {
	AbstractMethod* method = GetVirtualMethod(i);
	mh.ChangeMethod(method);
	if (name == mh.GetName() && signature == mh.GetSignature()) {
	return method;
	}
	}
	return NULL;
	}

	AbstractMethod* Class::FindDeclaredVirtualMethod(const DexCache* dex_cache, uint32_t dex_method_idx) const {
	if (GetDexCache() == dex_cache) {
	for (size_t i = 0; i < NumVirtualMethods(); ++i) {
	AbstractMethod* method = GetVirtualMethod(i);
	if (method->GetDexMethodIndex() == dex_method_idx) {
	return method;
	}
	}
	}
	return NULL;
	}

	AbstractMethod* Class::FindVirtualMethod(const StringPiece& name, const StringPiece& signature) const {
	for (const Class* klass = this; klass != NULL; klass = klass->GetSuperClass()) {
	AbstractMethod* method = klass->FindDeclaredVirtualMethod(name, signature);
	if (method != NULL) {
	return method;
	}
	}
	return NULL;
	}

	AbstractMethod* Class::FindVirtualMethod(const DexCache* dex_cache, uint32_t dex_method_idx) const {
	for (const Class* klass = this; klass != NULL; klass = klass->GetSuperClass()) {
	AbstractMethod* method = klass->FindDeclaredVirtualMethod(dex_cache, dex_method_idx);
	if (method != NULL) {
	return method;
	}
	}
	return NULL;
	}

	Field* Class::FindDeclaredInstanceField(const StringPiece& name, const StringPiece& type) {
	// Is the field in this class?
	// Interfaces are not relevant because they can't contain instance fields.
	FieldHelper fh;
	for (size_t i = 0; i < NumInstanceFields(); ++i) {
	Field* f = GetInstanceField(i);
	fh.ChangeField(f);
	if (name == fh.GetName() && type == fh.GetTypeDescriptor()) {
	return f;
	}
	}
	return NULL;
	}

	Field* Class::FindDeclaredInstanceField(const DexCache* dex_cache, uint32_t dex_field_idx) {
	if (GetDexCache() == dex_cache) {
	for (size_t i = 0; i < NumInstanceFields(); ++i) {
	Field* f = GetInstanceField(i);
	if (f->GetDexFieldIndex() == dex_field_idx) {
	return f;
	}
	}
	}
	return NULL;
	}

	Field* Class::FindInstanceField(const StringPiece& name, const StringPiece& type) {
	// Is the field in this class, or any of its superclasses?
	// Interfaces are not relevant because they can't contain instance fields.
	for (Class* c = this; c != NULL; c = c->GetSuperClass()) {
	Field* f = c->FindDeclaredInstanceField(name, type);
	if (f != NULL) {
	return f;
	}
	}
	return NULL;
	}

	Field* Class::FindInstanceField(const DexCache* dex_cache, uint32_t dex_field_idx) {
	// Is the field in this class, or any of its superclasses?
	// Interfaces are not relevant because they can't contain instance fields.
	for (Class* c = this; c != NULL; c = c->GetSuperClass()) {
	Field* f = c->FindDeclaredInstanceField(dex_cache, dex_field_idx);
	if (f != NULL) {
	return f;
	}
	}
	return NULL;
	}

	Field* Class::FindDeclaredStaticField(const StringPiece& name, const StringPiece& type) {
	DCHECK(type != NULL);
	FieldHelper fh;
	for (size_t i = 0; i < NumStaticFields(); ++i) {
	Field* f = GetStaticField(i);
	fh.ChangeField(f);
	if (name == fh.GetName() && type == fh.GetTypeDescriptor()) {
	return f;
	}
	}
	return NULL;
	}

	Field* Class::FindDeclaredStaticField(const DexCache* dex_cache, uint32_t dex_field_idx) {
	if (dex_cache == GetDexCache()) {
	for (size_t i = 0; i < NumStaticFields(); ++i) {
	Field* f = GetStaticField(i);
	if (f->GetDexFieldIndex() == dex_field_idx) {
	return f;
	}
	}
	}
	return NULL;
	}

	Field* Class::FindStaticField(const StringPiece& name, const StringPiece& type) {
	// Is the field in this class (or its interfaces), or any of its
	// superclasses (or their interfaces)?
	ClassHelper kh;
	for (Class* k = this; k != NULL; k = k->GetSuperClass()) {
	// Is the field in this class?
	Field* f = k->FindDeclaredStaticField(name, type);
	if (f != NULL) {
	return f;
	}
	// Is this field in any of this class' interfaces?
	kh.ChangeClass(k);
	for (uint32_t i = 0; i < kh.NumDirectInterfaces(); ++i) {
	Class* interface = kh.GetDirectInterface(i);
	f = interface->FindStaticField(name, type);
	if (f != NULL) {
	return f;
	}
	}
	}
	return NULL;
	}

	Field* Class::FindStaticField(const DexCache* dex_cache, uint32_t dex_field_idx) {
	ClassHelper kh;
	for (Class* k = this; k != NULL; k = k->GetSuperClass()) {
	// Is the field in this class?
	Field* f = k->FindDeclaredStaticField(dex_cache, dex_field_idx);
	if (f != NULL) {
	return f;
	}
	// Is this field in any of this class' interfaces?
	kh.ChangeClass(k);
	for (uint32_t i = 0; i < kh.NumDirectInterfaces(); ++i) {
	Class* interface = kh.GetDirectInterface(i);
	f = interface->FindStaticField(dex_cache, dex_field_idx);
	if (f != NULL) {
	return f;
	}
	}
	}
	return NULL;
	}

	Field* Class::FindField(const StringPiece& name, const StringPiece& type) {
	// Find a field using the JLS field resolution order
	ClassHelper kh;
	for (Class* k = this; k != NULL; k = k->GetSuperClass()) {
	// Is the field in this class?
	Field* f = k->FindDeclaredInstanceField(name, type);
	if (f != NULL) {
	return f;
	}
	f = k->FindDeclaredStaticField(name, type);
	if (f != NULL) {
	return f;
	}
	// Is this field in any of this class' interfaces?
	kh.ChangeClass(k);
	for (uint32_t i = 0; i < kh.NumDirectInterfaces(); ++i) {
	Class* interface = kh.GetDirectInterface(i);
	f = interface->FindStaticField(name, type);
	if (f != NULL) {
	return f;
	}
	}
	}
	return NULL;
	}

	} // namespace mirror
	} // namespace art