Determine HLoadClass/String load kind early.

This helps save memory by avoiding the allocation of
HEnvironment and related objects for AOT references to
boot image strings and classes (kBootImage* load kinds)
and also for JIT references (kJitTableAddress).

Compiling aosp_taimen-userdebug boot image, the most memory
hungry method BatteryStats.dumpLocked() needs
  - before:
    Used 55105384 bytes of arena memory...
    ...
    UseListNode    10009704
    Environment      423248
    EnvVRegs       20676560
    ...
  - after:
    Used 50559176 bytes of arena memory...
    ...
    UseListNode     8568936
    Environment      365680
    EnvVRegs       17628704
    ...

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing --jit
Bug: 34053922
Change-Id: I68e73a438e6ac8e8908e6fccf53bbeea8a64a077
diff --git a/runtime/art_method.cc b/runtime/art_method.cc
index 43a5139..ebfa4fe 100644
--- a/runtime/art_method.cc
+++ b/runtime/art_method.cc
@@ -134,7 +134,7 @@
   return dex_file->GetIndexForClassDef(*class_def);
 }
 
-mirror::String* ArtMethod::GetNameAsString(Thread* self) {
+ObjPtr<mirror::String> ArtMethod::GetNameAsString(Thread* self) {
   CHECK(!IsProxyMethod());
   StackHandleScope<1> hs(self);
   Handle<mirror::DexCache> dex_cache(hs.NewHandle(GetDexCache()));
@@ -550,8 +550,8 @@
   }
   auto* cl = Runtime::Current()->GetClassLinker();
   for (size_t i = 0; i < count; ++i) {
-    auto type_idx = proto_params->GetTypeItem(i).type_idx_;
-    auto* type = cl->ResolveType(type_idx, this);
+    dex::TypeIndex type_idx = proto_params->GetTypeItem(i).type_idx_;
+    ObjPtr<mirror::Class> type = cl->ResolveType(type_idx, this);
     if (type == nullptr) {
       Thread::Current()->AssertPendingException();
       return false;
diff --git a/runtime/art_method.h b/runtime/art_method.h
index 0a592e0..60e436c 100644
--- a/runtime/art_method.h
+++ b/runtime/art_method.h
@@ -575,7 +575,7 @@
 
   ALWAYS_INLINE const char* GetName() REQUIRES_SHARED(Locks::mutator_lock_);
 
-  mirror::String* GetNameAsString(Thread* self) REQUIRES_SHARED(Locks::mutator_lock_);
+  ObjPtr<mirror::String> GetNameAsString(Thread* self) REQUIRES_SHARED(Locks::mutator_lock_);
 
   const DexFile::CodeItem* GetCodeItem() REQUIRES_SHARED(Locks::mutator_lock_);
 
diff --git a/runtime/class_linker-inl.h b/runtime/class_linker-inl.h
index d6f0030..648b455 100644
--- a/runtime/class_linker-inl.h
+++ b/runtime/class_linker-inl.h
@@ -73,7 +73,8 @@
   return type;
 }
 
-inline mirror::Class* ClassLinker::ResolveType(dex::TypeIndex type_idx, ArtMethod* referrer) {
+inline ObjPtr<mirror::Class> ClassLinker::ResolveType(dex::TypeIndex type_idx,
+                                                      ArtMethod* referrer) {
   Thread::PoisonObjectPointersIfDebug();
   if (kIsDebugBuild) {
     Thread::Current()->AssertNoPendingException();
@@ -87,7 +88,7 @@
     const DexFile& dex_file = *dex_cache->GetDexFile();
     resolved_type = ResolveType(dex_file, type_idx, dex_cache, class_loader);
   }
-  return resolved_type.Ptr();
+  return resolved_type;
 }
 
 template <bool kThrowOnError, typename ClassGetter>
diff --git a/runtime/class_linker.cc b/runtime/class_linker.cc
index e5bb786..80d4bb1 100644
--- a/runtime/class_linker.cc
+++ b/runtime/class_linker.cc
@@ -7727,14 +7727,14 @@
   klass->SetReferenceInstanceOffsets(reference_offsets);
 }
 
-mirror::String* ClassLinker::ResolveString(const DexFile& dex_file,
-                                           dex::StringIndex string_idx,
-                                           Handle<mirror::DexCache> dex_cache) {
+ObjPtr<mirror::String> ClassLinker::ResolveString(const DexFile& dex_file,
+                                                  dex::StringIndex string_idx,
+                                                  Handle<mirror::DexCache> dex_cache) {
   DCHECK(dex_cache != nullptr);
   Thread::PoisonObjectPointersIfDebug();
   ObjPtr<mirror::String> resolved = dex_cache->GetResolvedString(string_idx);
   if (resolved != nullptr) {
-    return resolved.Ptr();
+    return resolved;
   }
   uint32_t utf16_length;
   const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length);
@@ -7742,16 +7742,16 @@
   if (string != nullptr) {
     dex_cache->SetResolvedString(string_idx, string);
   }
-  return string.Ptr();
+  return string;
 }
 
-mirror::String* ClassLinker::LookupString(const DexFile& dex_file,
-                                          dex::StringIndex string_idx,
-                                          ObjPtr<mirror::DexCache> dex_cache) {
+ObjPtr<mirror::String> ClassLinker::LookupString(const DexFile& dex_file,
+                                                 dex::StringIndex string_idx,
+                                                 ObjPtr<mirror::DexCache> dex_cache) {
   DCHECK(dex_cache != nullptr);
   ObjPtr<mirror::String> resolved = dex_cache->GetResolvedString(string_idx);
   if (resolved != nullptr) {
-    return resolved.Ptr();
+    return resolved;
   }
   uint32_t utf16_length;
   const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length);
@@ -7760,7 +7760,7 @@
   if (string != nullptr) {
     dex_cache->SetResolvedString(string_idx, string);
   }
-  return string.Ptr();
+  return string;
 }
 
 ObjPtr<mirror::Class> ClassLinker::LookupResolvedType(const DexFile& dex_file,
@@ -7794,19 +7794,19 @@
   return type;
 }
 
-mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file,
-                                        dex::TypeIndex type_idx,
-                                        ObjPtr<mirror::Class> referrer) {
+ObjPtr<mirror::Class> ClassLinker::ResolveType(const DexFile& dex_file,
+                                               dex::TypeIndex type_idx,
+                                               ObjPtr<mirror::Class> referrer) {
   StackHandleScope<2> hs(Thread::Current());
   Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache()));
   Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader()));
   return ResolveType(dex_file, type_idx, dex_cache, class_loader);
 }
 
-mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file,
-                                        dex::TypeIndex type_idx,
-                                        Handle<mirror::DexCache> dex_cache,
-                                        Handle<mirror::ClassLoader> class_loader) {
+ObjPtr<mirror::Class> ClassLinker::ResolveType(const DexFile& dex_file,
+                                               dex::TypeIndex type_idx,
+                                               Handle<mirror::DexCache> dex_cache,
+                                               Handle<mirror::ClassLoader> class_loader) {
   DCHECK(dex_cache != nullptr);
   Thread::PoisonObjectPointersIfDebug();
   ObjPtr<mirror::Class> resolved = dex_cache->GetResolvedType(type_idx);
@@ -7835,7 +7835,7 @@
   }
   DCHECK((resolved == nullptr) || resolved->IsResolved())
       << resolved->PrettyDescriptor() << " " << resolved->GetStatus();
-  return resolved.Ptr();
+  return resolved;
 }
 
 template <ClassLinker::ResolveMode kResolveMode>
@@ -8410,7 +8410,7 @@
   DexFileParameterIterator it(*dex_file, target_method->GetPrototype());
   while (it.HasNext()) {
     const dex::TypeIndex type_idx = it.GetTypeIdx();
-    mirror::Class* klass = ResolveType(*dex_file, type_idx, dex_cache, class_loader);
+    ObjPtr<mirror::Class> klass = ResolveType(*dex_file, type_idx, dex_cache, class_loader);
     if (nullptr == klass) {
       DCHECK(self->IsExceptionPending());
       return nullptr;
diff --git a/runtime/class_linker.h b/runtime/class_linker.h
index a4c4f3d..16255f4 100644
--- a/runtime/class_linker.h
+++ b/runtime/class_linker.h
@@ -245,31 +245,31 @@
 
   // Resolve a String with the given index from the DexFile, storing the
   // result in the DexCache.
-  mirror::String* ResolveString(const DexFile& dex_file,
-                                dex::StringIndex string_idx,
-                                Handle<mirror::DexCache> dex_cache)
+  ObjPtr<mirror::String> ResolveString(const DexFile& dex_file,
+                                       dex::StringIndex string_idx,
+                                       Handle<mirror::DexCache> dex_cache)
       REQUIRES_SHARED(Locks::mutator_lock_);
 
   // Find a String with the given index from the DexFile, storing the
   // result in the DexCache if found. Return null if not found.
-  mirror::String* LookupString(const DexFile& dex_file,
-                               dex::StringIndex string_idx,
-                               ObjPtr<mirror::DexCache> dex_cache)
+  ObjPtr<mirror::String> LookupString(const DexFile& dex_file,
+                                      dex::StringIndex string_idx,
+                                      ObjPtr<mirror::DexCache> dex_cache)
       REQUIRES_SHARED(Locks::mutator_lock_);
 
   // Resolve a Type with the given index from the DexFile, storing the
   // result in the DexCache. The referrer is used to identify the
   // target DexCache and ClassLoader to use for resolution.
-  mirror::Class* ResolveType(const DexFile& dex_file,
-                             dex::TypeIndex type_idx,
-                             ObjPtr<mirror::Class> referrer)
+  ObjPtr<mirror::Class> ResolveType(const DexFile& dex_file,
+                                    dex::TypeIndex type_idx,
+                                    ObjPtr<mirror::Class> referrer)
       REQUIRES_SHARED(Locks::mutator_lock_)
       REQUIRES(!Locks::dex_lock_, !Roles::uninterruptible_);
 
   // Resolve a Type with the given index from the DexFile, storing the
   // result in the DexCache. The referrer is used to identify the
   // target DexCache and ClassLoader to use for resolution.
-  mirror::Class* ResolveType(dex::TypeIndex type_idx, ArtMethod* referrer)
+  ObjPtr<mirror::Class> ResolveType(dex::TypeIndex type_idx, ArtMethod* referrer)
       REQUIRES_SHARED(Locks::mutator_lock_)
       REQUIRES(!Locks::dex_lock_, !Roles::uninterruptible_);
 
@@ -289,10 +289,10 @@
   // result in DexCache. The ClassLoader is used to search for the
   // type, since it may be referenced from but not contained within
   // the given DexFile.
-  mirror::Class* ResolveType(const DexFile& dex_file,
-                             dex::TypeIndex type_idx,
-                             Handle<mirror::DexCache> dex_cache,
-                             Handle<mirror::ClassLoader> class_loader)
+  ObjPtr<mirror::Class> ResolveType(const DexFile& dex_file,
+                                    dex::TypeIndex type_idx,
+                                    Handle<mirror::DexCache> dex_cache,
+                                    Handle<mirror::ClassLoader> class_loader)
       REQUIRES_SHARED(Locks::mutator_lock_)
       REQUIRES(!Locks::dex_lock_, !Roles::uninterruptible_);
 
diff --git a/runtime/class_linker_test.cc b/runtime/class_linker_test.cc
index 892a850..9412550 100644
--- a/runtime/class_linker_test.cc
+++ b/runtime/class_linker_test.cc
@@ -1304,10 +1304,18 @@
   const DexFile::TypeId* type_id = dex_file->FindTypeId("LStaticsFromCode;");
   ASSERT_TRUE(type_id != nullptr);
   dex::TypeIndex type_idx = dex_file->GetIndexForTypeId(*type_id);
-  mirror::Class* uninit = ResolveVerifyAndClinit(type_idx, clinit, soa.Self(), true, false);
+  ObjPtr<mirror::Class> uninit = ResolveVerifyAndClinit(type_idx,
+                                                        clinit,
+                                                        soa.Self(),
+                                                        /* can_run_clinit */ true,
+                                                        /* verify_access */ false);
   EXPECT_TRUE(uninit != nullptr);
   EXPECT_FALSE(uninit->IsInitialized());
-  mirror::Class* init = ResolveVerifyAndClinit(type_idx, getS0, soa.Self(), true, false);
+  ObjPtr<mirror::Class> init = ResolveVerifyAndClinit(type_idx,
+                                                      getS0,
+                                                      soa.Self(),
+                                                      /* can_run_clinit */ true,
+                                                      /* verify_access */ false);
   EXPECT_TRUE(init != nullptr);
   EXPECT_TRUE(init->IsInitialized());
 }
diff --git a/runtime/dex_file_annotations.cc b/runtime/dex_file_annotations.cc
index b44bd51..27b9202 100644
--- a/runtime/dex_file_annotations.cc
+++ b/runtime/dex_file_annotations.cc
@@ -783,9 +783,8 @@
     uint32_t type_index = DecodeUnsignedLeb128(&annotation);
     ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
     Thread* self = Thread::Current();
-    mirror::Class* resolved_class;
     StackHandleScope<2> hs(self);
-    resolved_class = class_linker->ResolveType(
+    ObjPtr<mirror::Class> resolved_class = class_linker->ResolveType(
         klass.GetDexFile(),
         dex::TypeIndex(type_index),
         hs.NewHandle(klass.GetDexCache()),
@@ -1594,17 +1593,17 @@
     case kDouble:  field->SetDouble<kTransactionActive>(field->GetDeclaringClass(), jval_.d); break;
     case kNull:    field->SetObject<kTransactionActive>(field->GetDeclaringClass(), nullptr); break;
     case kString: {
-      mirror::String* resolved = linker_->ResolveString(dex_file_,
-                                                        dex::StringIndex(jval_.i),
-                                                        *dex_cache_);
+      ObjPtr<mirror::String> resolved = linker_->ResolveString(dex_file_,
+                                                               dex::StringIndex(jval_.i),
+                                                               *dex_cache_);
       field->SetObject<kTransactionActive>(field->GetDeclaringClass(), resolved);
       break;
     }
     case kType: {
-      mirror::Class* resolved = linker_->ResolveType(dex_file_,
-                                                     dex::TypeIndex(jval_.i),
-                                                     *dex_cache_,
-                                                     *class_loader_);
+      ObjPtr<mirror::Class> resolved = linker_->ResolveType(dex_file_,
+                                                            dex::TypeIndex(jval_.i),
+                                                            *dex_cache_,
+                                                            *class_loader_);
       field->SetObject<kTransactionActive>(field->GetDeclaringClass(), resolved);
       break;
     }
diff --git a/runtime/entrypoints/entrypoint_utils-inl.h b/runtime/entrypoints/entrypoint_utils-inl.h
index 8253739..475c1e7 100644
--- a/runtime/entrypoints/entrypoint_utils-inl.h
+++ b/runtime/entrypoints/entrypoint_utils-inl.h
@@ -245,7 +245,7 @@
     *slow_path = true;
     return nullptr;  // Failure
   }
-  mirror::Class* klass = method->GetDexCache()->GetResolvedType(type_idx);
+  ObjPtr<mirror::Class> klass = method->GetDexCache()->GetResolvedType(type_idx);
   if (UNLIKELY(klass == nullptr)) {  // Not in dex cache so try to resolve
     ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
     klass = class_linker->ResolveType(type_idx, method);
@@ -264,7 +264,7 @@
       return nullptr;  // Failure
     }
   }
-  return klass;
+  return klass.Ptr();
 }
 
 // Given the context of a calling Method, use its DexCache to resolve a type to an array Class. If
@@ -500,7 +500,8 @@
       Handle<mirror::Class> h_referring_class(hs2.NewHandle(referrer->GetDeclaringClass()));
       const dex::TypeIndex method_type_idx =
           referrer->GetDexFile()->GetMethodId(method_idx).class_idx_;
-      mirror::Class* method_reference_class = class_linker->ResolveType(method_type_idx, referrer);
+      ObjPtr<mirror::Class> method_reference_class =
+          class_linker->ResolveType(method_type_idx, referrer);
       if (UNLIKELY(method_reference_class == nullptr)) {
         // Bad type idx.
         CHECK(self->IsExceptionPending());
@@ -711,13 +712,13 @@
   }
 }
 
-inline mirror::Class* ResolveVerifyAndClinit(dex::TypeIndex type_idx,
-                                             ArtMethod* referrer,
-                                             Thread* self,
-                                             bool can_run_clinit,
-                                             bool verify_access) {
+inline ObjPtr<mirror::Class> ResolveVerifyAndClinit(dex::TypeIndex type_idx,
+                                                    ArtMethod* referrer,
+                                                    Thread* self,
+                                                    bool can_run_clinit,
+                                                    bool verify_access) {
   ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
-  mirror::Class* klass = class_linker->ResolveType(type_idx, referrer);
+  ObjPtr<mirror::Class> klass = class_linker->ResolveType(type_idx, referrer);
   if (UNLIKELY(klass == nullptr)) {
     CHECK(self->IsExceptionPending());
     return nullptr;  // Failure - Indicate to caller to deliver exception
@@ -748,9 +749,9 @@
   return h_class.Get();
 }
 
-static inline mirror::String* ResolveString(ClassLinker* class_linker,
-                                            dex::StringIndex string_idx,
-                                            ArtMethod* referrer)
+static inline ObjPtr<mirror::String> ResolveString(ClassLinker* class_linker,
+                                                   dex::StringIndex string_idx,
+                                                   ArtMethod* referrer)
     REQUIRES_SHARED(Locks::mutator_lock_) {
   Thread::PoisonObjectPointersIfDebug();
   ObjPtr<mirror::String> string = referrer->GetDexCache()->GetResolvedString(string_idx);
@@ -760,10 +761,11 @@
     const DexFile& dex_file = *dex_cache->GetDexFile();
     string = class_linker->ResolveString(dex_file, string_idx, dex_cache);
   }
-  return string.Ptr();
+  return string;
 }
 
-inline mirror::String* ResolveStringFromCode(ArtMethod* referrer, dex::StringIndex string_idx) {
+inline ObjPtr<mirror::String> ResolveStringFromCode(ArtMethod* referrer,
+                                                    dex::StringIndex string_idx) {
   Thread::PoisonObjectPointersIfDebug();
   ObjPtr<mirror::String> string = referrer->GetDexCache()->GetResolvedString(string_idx);
   if (UNLIKELY(string == nullptr)) {
@@ -773,7 +775,7 @@
     ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
     string = class_linker->ResolveString(dex_file, string_idx, dex_cache);
   }
-  return string.Ptr();
+  return string;
 }
 
 inline void UnlockJniSynchronizedMethod(jobject locked, Thread* self) {
diff --git a/runtime/entrypoints/entrypoint_utils.h b/runtime/entrypoints/entrypoint_utils.h
index cda70ea..830ef84 100644
--- a/runtime/entrypoints/entrypoint_utils.h
+++ b/runtime/entrypoints/entrypoint_utils.h
@@ -143,15 +143,16 @@
                                  ArtMethod* referrer)
     REQUIRES_SHARED(Locks::mutator_lock_);
 
-inline mirror::Class* ResolveVerifyAndClinit(dex::TypeIndex type_idx,
-                                             ArtMethod* referrer,
-                                             Thread* self,
-                                             bool can_run_clinit,
-                                             bool verify_access)
+inline ObjPtr<mirror::Class> ResolveVerifyAndClinit(dex::TypeIndex type_idx,
+                                                    ArtMethod* referrer,
+                                                    Thread* self,
+                                                    bool can_run_clinit,
+                                                    bool verify_access)
     REQUIRES_SHARED(Locks::mutator_lock_)
     REQUIRES(!Roles::uninterruptible_);
 
-inline mirror::String* ResolveStringFromCode(ArtMethod* referrer, dex::StringIndex string_idx)
+inline ObjPtr<mirror::String> ResolveStringFromCode(ArtMethod* referrer,
+                                                    dex::StringIndex string_idx)
     REQUIRES_SHARED(Locks::mutator_lock_)
     REQUIRES(!Roles::uninterruptible_);
 
diff --git a/runtime/entrypoints/quick/quick_dexcache_entrypoints.cc b/runtime/entrypoints/quick/quick_dexcache_entrypoints.cc
index 238ada9..9837838 100644
--- a/runtime/entrypoints/quick/quick_dexcache_entrypoints.cc
+++ b/runtime/entrypoints/quick/quick_dexcache_entrypoints.cc
@@ -138,15 +138,15 @@
   auto caller_and_outer = GetCalleeSaveMethodCallerAndOuterMethod(
       self, CalleeSaveType::kSaveEverythingForClinit);
   ArtMethod* caller = caller_and_outer.caller;
-  mirror::Class* result = ResolveVerifyAndClinit(dex::TypeIndex(type_idx),
-                                                 caller,
-                                                 self,
-                                                 /* can_run_clinit */ true,
-                                                 /* verify_access */ false);
+  ObjPtr<mirror::Class> result = ResolveVerifyAndClinit(dex::TypeIndex(type_idx),
+                                                        caller,
+                                                        self,
+                                                        /* can_run_clinit */ true,
+                                                        /* verify_access */ false);
   if (LIKELY(result != nullptr) && CanReferenceBss(caller_and_outer.outer_method, caller)) {
     StoreTypeInBss(caller_and_outer.outer_method, dex::TypeIndex(type_idx), result);
   }
-  return result;
+  return result.Ptr();
 }
 
 extern "C" mirror::Class* artInitializeTypeFromCode(uint32_t type_idx, Thread* self)
@@ -156,15 +156,15 @@
   auto caller_and_outer = GetCalleeSaveMethodCallerAndOuterMethod(
       self, CalleeSaveType::kSaveEverythingForClinit);
   ArtMethod* caller = caller_and_outer.caller;
-  mirror::Class* result = ResolveVerifyAndClinit(dex::TypeIndex(type_idx),
-                                                 caller,
-                                                 self,
-                                                 /* can_run_clinit */ false,
-                                                 /* verify_access */ false);
+  ObjPtr<mirror::Class> result = ResolveVerifyAndClinit(dex::TypeIndex(type_idx),
+                                                        caller,
+                                                        self,
+                                                        /* can_run_clinit */ false,
+                                                        /* verify_access */ false);
   if (LIKELY(result != nullptr) && CanReferenceBss(caller_and_outer.outer_method, caller)) {
     StoreTypeInBss(caller_and_outer.outer_method, dex::TypeIndex(type_idx), result);
   }
-  return result;
+  return result.Ptr();
 }
 
 extern "C" mirror::Class* artInitializeTypeAndVerifyAccessFromCode(uint32_t type_idx, Thread* self)
@@ -174,13 +174,13 @@
   auto caller_and_outer = GetCalleeSaveMethodCallerAndOuterMethod(self,
                                                                   CalleeSaveType::kSaveEverything);
   ArtMethod* caller = caller_and_outer.caller;
-  mirror::Class* result = ResolveVerifyAndClinit(dex::TypeIndex(type_idx),
-                                                 caller,
-                                                 self,
-                                                 /* can_run_clinit */ false,
-                                                 /* verify_access */ true);
+  ObjPtr<mirror::Class> result = ResolveVerifyAndClinit(dex::TypeIndex(type_idx),
+                                                        caller,
+                                                        self,
+                                                        /* can_run_clinit */ false,
+                                                        /* verify_access */ true);
   // Do not StoreTypeInBss(); access check entrypoint is never used together with .bss.
-  return result;
+  return result.Ptr();
 }
 
 extern "C" mirror::String* artResolveStringFromCode(int32_t string_idx, Thread* self)
@@ -189,11 +189,11 @@
   auto caller_and_outer = GetCalleeSaveMethodCallerAndOuterMethod(self,
                                                                   CalleeSaveType::kSaveEverything);
   ArtMethod* caller = caller_and_outer.caller;
-  mirror::String* result = ResolveStringFromCode(caller, dex::StringIndex(string_idx));
+  ObjPtr<mirror::String> result = ResolveStringFromCode(caller, dex::StringIndex(string_idx));
   if (LIKELY(result != nullptr) && CanReferenceBss(caller_and_outer.outer_method, caller)) {
     StoreStringInBss(caller_and_outer.outer_method, dex::StringIndex(string_idx), result);
   }
-  return result;
+  return result.Ptr();
 }
 
 }  // namespace art
diff --git a/runtime/interpreter/mterp/mterp.cc b/runtime/interpreter/mterp/mterp.cc
index 987298b..9c7645a 100644
--- a/runtime/interpreter/mterp/mterp.cc
+++ b/runtime/interpreter/mterp/mterp.cc
@@ -376,15 +376,15 @@
                                   ShadowFrame* shadow_frame,
                                   Thread* self)
     REQUIRES_SHARED(Locks::mutator_lock_) {
-  mirror::Class* c = ResolveVerifyAndClinit(dex::TypeIndex(index),
-                                            shadow_frame->GetMethod(),
-                                            self,
-                                            false,
-                                            false);
+  ObjPtr<mirror::Class> c = ResolveVerifyAndClinit(dex::TypeIndex(index),
+                                                   shadow_frame->GetMethod(),
+                                                   self,
+                                                   /* can_run_clinit */ false,
+                                                   /* verify_access */ false);
   if (UNLIKELY(c == nullptr)) {
     return true;
   }
-  shadow_frame->SetVRegReference(tgt_vreg, c);
+  shadow_frame->SetVRegReference(tgt_vreg, c.Ptr());
   return false;
 }
 
@@ -463,17 +463,17 @@
     REQUIRES_SHARED(Locks::mutator_lock_) {
   const Instruction* inst = Instruction::At(shadow_frame->GetDexPCPtr());
   mirror::Object* obj = nullptr;
-  mirror::Class* c = ResolveVerifyAndClinit(dex::TypeIndex(inst->VRegB_21c()),
-                                            shadow_frame->GetMethod(),
-                                            self,
-                                            false,
-                                            false);
+  ObjPtr<mirror::Class> c = ResolveVerifyAndClinit(dex::TypeIndex(inst->VRegB_21c()),
+                                                   shadow_frame->GetMethod(),
+                                                   self,
+                                                   /* can_run_clinit */ false,
+                                                   /* verify_access */ false);
   if (LIKELY(c != nullptr)) {
     if (UNLIKELY(c->IsStringClass())) {
       gc::AllocatorType allocator_type = Runtime::Current()->GetHeap()->GetCurrentAllocator();
       obj = mirror::String::AllocEmptyString<true>(self, allocator_type);
     } else {
-      obj = AllocObjectFromCode<true>(c,
+      obj = AllocObjectFromCode<true>(c.Ptr(),
                                       self,
                                       Runtime::Current()->GetHeap()->GetCurrentAllocator());
     }
diff --git a/runtime/transaction_test.cc b/runtime/transaction_test.cc
index e52dd08..f922dd3 100644
--- a/runtime/transaction_test.cc
+++ b/runtime/transaction_test.cc
@@ -502,10 +502,11 @@
   ASSERT_TRUE(h_klass->IsInitialized());
   // Make sure the string got resolved by the transaction.
   {
-    mirror::String* s = class_linker_->LookupString(*dex_file, string_idx, h_dex_cache.Get());
+    ObjPtr<mirror::String> s =
+        class_linker_->LookupString(*dex_file, string_idx, h_dex_cache.Get());
     ASSERT_TRUE(s != nullptr);
     EXPECT_STREQ(s->ToModifiedUtf8().c_str(), kResolvedString);
-    EXPECT_EQ(s, h_dex_cache->GetResolvedString(string_idx));
+    EXPECT_EQ(s.Ptr(), h_dex_cache->GetResolvedString(string_idx));
   }
   Runtime::Current()->RollbackAndExitTransactionMode();
   // Check that the string did not stay resolved.
diff --git a/runtime/verifier/method_verifier.cc b/runtime/verifier/method_verifier.cc
index fefb4f6..b6b152f 100644
--- a/runtime/verifier/method_verifier.cc
+++ b/runtime/verifier/method_verifier.cc
@@ -1074,9 +1074,9 @@
       // Ensure exception types are resolved so that they don't need resolution to be delivered,
       // unresolved exception types will be ignored by exception delivery
       if (iterator.GetHandlerTypeIndex().IsValid()) {
-        mirror::Class* exception_type = linker->ResolveType(*dex_file_,
-                                                            iterator.GetHandlerTypeIndex(),
-                                                            dex_cache_, class_loader_);
+        ObjPtr<mirror::Class> exception_type = linker->ResolveType(*dex_file_,
+                                                                   iterator.GetHandlerTypeIndex(),
+                                                                   dex_cache_, class_loader_);
         if (exception_type == nullptr) {
           DCHECK(self_->IsExceptionPending());
           self_->ClearException();
@@ -3639,8 +3639,8 @@
         has_catch_all_handler = true;
       } else {
         // It is also a catch-all if it is java.lang.Throwable.
-        mirror::Class* klass = linker->ResolveType(*dex_file_, handler_type_idx, dex_cache_,
-                                                   class_loader_);
+        ObjPtr<mirror::Class> klass =
+            linker->ResolveType(*dex_file_, handler_type_idx, dex_cache_, class_loader_);
         if (klass != nullptr) {
           if (klass == mirror::Throwable::GetJavaLangThrowable()) {
             has_catch_all_handler = true;
@@ -3758,16 +3758,16 @@
                                            << "non-instantiable klass " << descriptor;
 }
 
-inline bool MethodVerifier::IsInstantiableOrPrimitive(mirror::Class* klass) {
+inline bool MethodVerifier::IsInstantiableOrPrimitive(ObjPtr<mirror::Class> klass) {
   return klass->IsInstantiable() || klass->IsPrimitive();
 }
 
 template <MethodVerifier::CheckAccess C>
 const RegType& MethodVerifier::ResolveClass(dex::TypeIndex class_idx) {
-  mirror::Class* klass = can_load_classes_
+  ObjPtr<mirror::Class> klass = can_load_classes_
       ? Runtime::Current()->GetClassLinker()->ResolveType(
           *dex_file_, class_idx, dex_cache_, class_loader_)
-      : ClassLinker::LookupResolvedType(class_idx, dex_cache_.Get(), class_loader_.Get()).Ptr();
+      : ClassLinker::LookupResolvedType(class_idx, dex_cache_.Get(), class_loader_.Get());
   if (can_load_classes_ && klass == nullptr) {
     DCHECK(self_->IsExceptionPending());
     self_->ClearException();
@@ -3780,10 +3780,10 @@
       UninstantiableError(descriptor);
       precise = false;
     }
-    result = reg_types_.FindClass(klass, precise);
+    result = reg_types_.FindClass(klass.Ptr(), precise);
     if (result == nullptr) {
       const char* descriptor = dex_file_->StringByTypeIdx(class_idx);
-      result = reg_types_.InsertClass(descriptor, klass, precise);
+      result = reg_types_.InsertClass(descriptor, klass.Ptr(), precise);
     }
   } else {
     const char* descriptor = dex_file_->StringByTypeIdx(class_idx);
@@ -3798,7 +3798,7 @@
   }
 
   // Record result of class resolution attempt.
-  VerifierDeps::MaybeRecordClassResolution(*dex_file_, class_idx, klass);
+  VerifierDeps::MaybeRecordClassResolution(*dex_file_, class_idx, klass.Ptr());
 
   // If requested, check if access is allowed. Unresolved types are included in this check, as the
   // interpreter only tests whether access is allowed when a class is not pre-verified and runs in
diff --git a/runtime/verifier/method_verifier.h b/runtime/verifier/method_verifier.h
index c885914..f26f3e2 100644
--- a/runtime/verifier/method_verifier.h
+++ b/runtime/verifier/method_verifier.h
@@ -257,7 +257,8 @@
       REQUIRES_SHARED(Locks::mutator_lock_);
 
   void UninstantiableError(const char* descriptor);
-  static bool IsInstantiableOrPrimitive(mirror::Class* klass) REQUIRES_SHARED(Locks::mutator_lock_);
+  static bool IsInstantiableOrPrimitive(ObjPtr<mirror::Class> klass)
+      REQUIRES_SHARED(Locks::mutator_lock_);
 
   // Is the method being verified a constructor? See the comment on the field.
   bool IsConstructor() const {