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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_INDIRECT_REFERENCE_TABLE_INL_H_
     18 #define ART_RUNTIME_INDIRECT_REFERENCE_TABLE_INL_H_
     19 
     20 #include "indirect_reference_table.h"
     21 
     22 #include "android-base/stringprintf.h"
     23 
     24 #include "base/dumpable.h"
     25 #include "gc_root-inl.h"
     26 #include "obj_ptr-inl.h"
     27 #include "verify_object.h"
     28 
     29 namespace art {
     30 namespace mirror {
     31 class Object;
     32 }  // namespace mirror
     33 
     34 // Verifies that the indirect table lookup is valid.
     35 // Returns "false" if something looks bad.
     36 inline bool IndirectReferenceTable::GetChecked(IndirectRef iref) const {
     37   if (UNLIKELY(iref == nullptr)) {
     38     LOG(WARNING) << "Attempt to look up nullptr " << kind_;
     39     return false;
     40   }
     41   if (UNLIKELY(GetIndirectRefKind(iref) == kHandleScopeOrInvalid)) {
     42     AbortIfNoCheckJNI(android::base::StringPrintf("JNI ERROR (app bug): invalid %s %p",
     43                                                   GetIndirectRefKindString(kind_),
     44                                                   iref));
     45     return false;
     46   }
     47   const uint32_t top_index = segment_state_.top_index;
     48   uint32_t idx = ExtractIndex(iref);
     49   if (UNLIKELY(idx >= top_index)) {
     50     std::string msg = android::base::StringPrintf(
     51         "JNI ERROR (app bug): accessed stale %s %p  (index %d in a table of size %d)",
     52         GetIndirectRefKindString(kind_),
     53         iref,
     54         idx,
     55         top_index);
     56     AbortIfNoCheckJNI(msg);
     57     return false;
     58   }
     59   if (UNLIKELY(table_[idx].GetReference()->IsNull())) {
     60     AbortIfNoCheckJNI(android::base::StringPrintf("JNI ERROR (app bug): accessed deleted %s %p",
     61                                                   GetIndirectRefKindString(kind_),
     62                                                   iref));
     63     return false;
     64   }
     65   if (UNLIKELY(!CheckEntry("use", iref, idx))) {
     66     return false;
     67   }
     68   return true;
     69 }
     70 
     71 // Make sure that the entry at "idx" is correctly paired with "iref".
     72 inline bool IndirectReferenceTable::CheckEntry(const char* what,
     73                                                IndirectRef iref,
     74                                                uint32_t idx) const {
     75   IndirectRef checkRef = ToIndirectRef(idx);
     76   if (UNLIKELY(checkRef != iref)) {
     77     std::string msg = android::base::StringPrintf(
     78         "JNI ERROR (app bug): attempt to %s stale %s %p (should be %p)",
     79         what,
     80         GetIndirectRefKindString(kind_),
     81         iref,
     82         checkRef);
     83     AbortIfNoCheckJNI(msg);
     84     return false;
     85   }
     86   return true;
     87 }
     88 
     89 template<ReadBarrierOption kReadBarrierOption>
     90 inline ObjPtr<mirror::Object> IndirectReferenceTable::Get(IndirectRef iref) const {
     91   if (!GetChecked(iref)) {
     92     return nullptr;
     93   }
     94   uint32_t idx = ExtractIndex(iref);
     95   ObjPtr<mirror::Object> obj = table_[idx].GetReference()->Read<kReadBarrierOption>();
     96   VerifyObject(obj);
     97   return obj;
     98 }
     99 
    100 inline void IndirectReferenceTable::Update(IndirectRef iref, ObjPtr<mirror::Object> obj) {
    101   if (!GetChecked(iref)) {
    102     LOG(WARNING) << "IndirectReferenceTable Update failed to find reference " << iref;
    103     return;
    104   }
    105   uint32_t idx = ExtractIndex(iref);
    106   table_[idx].SetReference(obj);
    107 }
    108 
    109 inline void IrtEntry::Add(ObjPtr<mirror::Object> obj) {
    110   ++serial_;
    111   if (serial_ == kIRTPrevCount) {
    112     serial_ = 0;
    113   }
    114   references_[serial_] = GcRoot<mirror::Object>(obj.Ptr());
    115 }
    116 
    117 inline void IrtEntry::SetReference(ObjPtr<mirror::Object> obj) {
    118   DCHECK_LT(serial_, kIRTPrevCount);
    119   references_[serial_] = GcRoot<mirror::Object>(obj.Ptr());
    120 }
    121 
    122 }  // namespace art
    123 
    124 #endif  // ART_RUNTIME_INDIRECT_REFERENCE_TABLE_INL_H_
    125