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      1 /*
      2  * Copyright (C) 2014 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef ART_RUNTIME_HANDLE_SCOPE_INL_H_
     18 #define ART_RUNTIME_HANDLE_SCOPE_INL_H_
     19 
     20 #include "handle_scope.h"
     21 
     22 #include "base/mutex.h"
     23 #include "handle.h"
     24 #include "thread-inl.h"
     25 #include "verify_object-inl.h"
     26 
     27 namespace art {
     28 
     29 template<size_t kNumReferences>
     30 inline StackHandleScope<kNumReferences>::StackHandleScope(Thread* self, mirror::Object* fill_value)
     31     : HandleScope(self->GetTopHandleScope(), kNumReferences), self_(self), pos_(0) {
     32   DCHECK_EQ(self, Thread::Current());
     33   if (kDebugLocking) {
     34     Locks::mutator_lock_->AssertSharedHeld(Thread::Current());
     35   }
     36   static_assert(kNumReferences >= 1, "StackHandleScope must contain at least 1 reference");
     37   // TODO: Figure out how to use a compile assert.
     38   CHECK_EQ(&storage_[0], GetReferences());
     39   for (size_t i = 0; i < kNumReferences; ++i) {
     40     SetReference(i, fill_value);
     41   }
     42   self_->PushHandleScope(this);
     43 }
     44 
     45 template<size_t kNumReferences>
     46 inline StackHandleScope<kNumReferences>::~StackHandleScope() {
     47   HandleScope* top_handle_scope = self_->PopHandleScope();
     48   DCHECK_EQ(top_handle_scope, this);
     49   if (kDebugLocking) {
     50     Locks::mutator_lock_->AssertSharedHeld(self_);
     51   }
     52 }
     53 
     54 inline size_t HandleScope::SizeOf(uint32_t num_references) {
     55   size_t header_size = sizeof(HandleScope);
     56   size_t data_size = sizeof(StackReference<mirror::Object>) * num_references;
     57   return header_size + data_size;
     58 }
     59 
     60 inline size_t HandleScope::SizeOf(size_t pointer_size, uint32_t num_references) {
     61   // Assume that the layout is packed.
     62   size_t header_size = pointer_size + sizeof(number_of_references_);
     63   size_t data_size = sizeof(StackReference<mirror::Object>) * num_references;
     64   return header_size + data_size;
     65 }
     66 
     67 inline mirror::Object* HandleScope::GetReference(size_t i) const {
     68   DCHECK_LT(i, number_of_references_);
     69   if (kDebugLocking) {
     70     Locks::mutator_lock_->AssertSharedHeld(Thread::Current());
     71   }
     72   return GetReferences()[i].AsMirrorPtr();
     73 }
     74 
     75 inline Handle<mirror::Object> HandleScope::GetHandle(size_t i) {
     76   DCHECK_LT(i, number_of_references_);
     77   return Handle<mirror::Object>(&GetReferences()[i]);
     78 }
     79 
     80 inline MutableHandle<mirror::Object> HandleScope::GetMutableHandle(size_t i) {
     81   DCHECK_LT(i, number_of_references_);
     82   return MutableHandle<mirror::Object>(&GetReferences()[i]);
     83 }
     84 
     85 inline void HandleScope::SetReference(size_t i, mirror::Object* object) {
     86   if (kDebugLocking) {
     87     Locks::mutator_lock_->AssertSharedHeld(Thread::Current());
     88   }
     89   DCHECK_LT(i, number_of_references_);
     90   GetReferences()[i].Assign(object);
     91 }
     92 
     93 inline bool HandleScope::Contains(StackReference<mirror::Object>* handle_scope_entry) const {
     94   // A HandleScope should always contain something. One created by the
     95   // jni_compiler should have a jobject/jclass as a native method is
     96   // passed in a this pointer or a class
     97   DCHECK_GT(number_of_references_, 0U);
     98   return &GetReferences()[0] <= handle_scope_entry &&
     99       handle_scope_entry <= &GetReferences()[number_of_references_ - 1];
    100 }
    101 
    102 template<size_t kNumReferences> template<class T>
    103 inline MutableHandle<T> StackHandleScope<kNumReferences>::NewHandle(T* object) {
    104   SetReference(pos_, object);
    105   MutableHandle<T> h(GetHandle<T>(pos_));
    106   pos_++;
    107   return h;
    108 }
    109 
    110 template<size_t kNumReferences> template<class T>
    111 inline HandleWrapper<T> StackHandleScope<kNumReferences>::NewHandleWrapper(T** object) {
    112   SetReference(pos_, *object);
    113   MutableHandle<T> h(GetHandle<T>(pos_));
    114   pos_++;
    115   return HandleWrapper<T>(object, h);
    116 }
    117 
    118 template<size_t kNumReferences>
    119 inline void StackHandleScope<kNumReferences>::SetReference(size_t i, mirror::Object* object) {
    120   if (kDebugLocking) {
    121     Locks::mutator_lock_->AssertSharedHeld(Thread::Current());
    122   }
    123   DCHECK_LT(i, kNumReferences);
    124   VerifyObject(object);
    125   GetReferences()[i].Assign(object);
    126 }
    127 
    128 }  // namespace art
    129 
    130 #endif  // ART_RUNTIME_HANDLE_SCOPE_INL_H_
    131