runtime/entrypoints/quick/quick_dexcache_entrypoints.cc

/*
 * Copyright (C) 2012 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 "art_method-inl.h"
#include "callee_save_frame.h"
#include "entrypoints/entrypoint_utils-inl.h"
#include "class_linker-inl.h"
#include "class_table-inl.h"
#include "dex_file-inl.h"
#include "gc/heap.h"
#include "mirror/class-inl.h"
#include "mirror/class_loader.h"
#include "mirror/object_array-inl.h"
#include "mirror/object-inl.h"
#include "oat_file.h"
#include "runtime.h"

namespace art {

extern "C" mirror::Class* artInitializeStaticStorageFromCode(uint32_t type_idx, Thread* self)
    REQUIRES_SHARED(Locks::mutator_lock_) {
  // Called to ensure static storage base is initialized for direct static field reads and writes.
  // A class may be accessing another class' fields when it doesn't have access, as access has been
  // given by inheritance.
  ScopedQuickEntrypointChecks sqec(self);
  auto* caller = GetCalleeSaveMethodCaller(self, Runtime::kSaveRefsOnly);
  return ResolveVerifyAndClinit(type_idx, caller, self, true, false);
}

extern "C" mirror::Class* artInitializeTypeFromCode(uint32_t type_idx, Thread* self)
    REQUIRES_SHARED(Locks::mutator_lock_) {
  // Called when method->dex_cache_resolved_types_[] misses.
  ScopedQuickEntrypointChecks sqec(self);
  auto* caller = GetCalleeSaveMethodCaller(self, Runtime::kSaveRefsOnly);
  return ResolveVerifyAndClinit(type_idx, caller, self, false, false);
}

extern "C" mirror::Class* artInitializeTypeAndVerifyAccessFromCode(uint32_t type_idx, Thread* self)
    REQUIRES_SHARED(Locks::mutator_lock_) {
  // Called when caller isn't guaranteed to have access to a type and the dex cache may be
  // unpopulated.
  ScopedQuickEntrypointChecks sqec(self);
  auto* caller = GetCalleeSaveMethodCaller(self, Runtime::kSaveRefsOnly);
  return ResolveVerifyAndClinit(type_idx, caller, self, false, true);
}

extern "C" mirror::String* artResolveStringFromCode(int32_t string_idx, Thread* self)
    REQUIRES_SHARED(Locks::mutator_lock_) {
  ScopedQuickEntrypointChecks sqec(self);
  auto* caller = GetCalleeSaveMethodCaller(self, Runtime::kSaveRefsOnly);
  mirror::String* result = ResolveStringFromCode(caller, string_idx);
  if (LIKELY(result != nullptr)) {
    // For AOT code, we need a write barrier for the dex cache that holds the GC roots in the .bss.
    const DexFile* dex_file = caller->GetDexFile();
    if (dex_file != nullptr &&
        dex_file->GetOatDexFile() != nullptr &&
        !dex_file->GetOatDexFile()->GetOatFile()->GetBssGcRoots().empty()) {
      mirror::ClassLoader* class_loader = caller->GetDeclaringClass()->GetClassLoader();
      // Note that we emit the barrier before the compiled code stores the string as GC root.
      // This is OK as there is no suspend point point in between.
      Runtime::Current()->GetHeap()->WriteBarrierEveryFieldOf(class_loader);
    }
  }
  return result;
}

}  // namespace art