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      1 /*
      2  * Copyright (C) 2012 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_DEX2OAT_DRIVER_COMPILER_DRIVER_INL_H_
     18 #define ART_DEX2OAT_DRIVER_COMPILER_DRIVER_INL_H_
     19 
     20 #include "compiler_driver.h"
     21 
     22 #include "art_field-inl.h"
     23 #include "art_method-inl.h"
     24 #include "base/enums.h"
     25 #include "class_linker-inl.h"
     26 #include "driver/dex_compilation_unit.h"
     27 #include "handle_scope-inl.h"
     28 #include "mirror/class_loader.h"
     29 #include "mirror/dex_cache-inl.h"
     30 #include "runtime.h"
     31 #include "scoped_thread_state_change-inl.h"
     32 
     33 namespace art {
     34 
     35 inline ObjPtr<mirror::Class> CompilerDriver::ResolveClass(
     36     const ScopedObjectAccess& soa,
     37     Handle<mirror::DexCache> dex_cache,
     38     Handle<mirror::ClassLoader> class_loader,
     39     dex::TypeIndex cls_index,
     40     const DexCompilationUnit* mUnit) {
     41   DCHECK_EQ(dex_cache->GetDexFile(), mUnit->GetDexFile());
     42   DCHECK_EQ(class_loader.Get(), mUnit->GetClassLoader().Get());
     43   ObjPtr<mirror::Class> cls =
     44       mUnit->GetClassLinker()->ResolveType(cls_index, dex_cache, class_loader);
     45   DCHECK_EQ(cls == nullptr, soa.Self()->IsExceptionPending());
     46   if (UNLIKELY(cls == nullptr)) {
     47     // Clean up any exception left by type resolution.
     48     soa.Self()->ClearException();
     49   }
     50   return cls;
     51 }
     52 
     53 inline ObjPtr<mirror::Class> CompilerDriver::ResolveCompilingMethodsClass(
     54     const ScopedObjectAccess& soa,
     55     Handle<mirror::DexCache> dex_cache,
     56     Handle<mirror::ClassLoader> class_loader,
     57     const DexCompilationUnit* mUnit) {
     58   DCHECK_EQ(dex_cache->GetDexFile(), mUnit->GetDexFile());
     59   DCHECK_EQ(class_loader.Get(), mUnit->GetClassLoader().Get());
     60   const dex::MethodId& referrer_method_id =
     61       mUnit->GetDexFile()->GetMethodId(mUnit->GetDexMethodIndex());
     62   return ResolveClass(soa, dex_cache, class_loader, referrer_method_id.class_idx_, mUnit);
     63 }
     64 
     65 inline ArtField* CompilerDriver::ResolveField(const ScopedObjectAccess& soa,
     66                                               Handle<mirror::DexCache> dex_cache,
     67                                               Handle<mirror::ClassLoader> class_loader,
     68                                               uint32_t field_idx,
     69                                               bool is_static) {
     70   ArtField* resolved_field = Runtime::Current()->GetClassLinker()->ResolveField(
     71       field_idx, dex_cache, class_loader, is_static);
     72   DCHECK_EQ(resolved_field == nullptr, soa.Self()->IsExceptionPending());
     73   if (UNLIKELY(resolved_field == nullptr)) {
     74     // Clean up any exception left by type resolution.
     75     soa.Self()->ClearException();
     76     return nullptr;
     77   }
     78   if (UNLIKELY(resolved_field->IsStatic() != is_static)) {
     79     // ClassLinker can return a field of the wrong kind directly from the DexCache.
     80     // Silently return null on such incompatible class change.
     81     return nullptr;
     82   }
     83   return resolved_field;
     84 }
     85 
     86 inline std::pair<bool, bool> CompilerDriver::IsFastInstanceField(
     87     ObjPtr<mirror::DexCache> dex_cache,
     88     ObjPtr<mirror::Class> referrer_class,
     89     ArtField* resolved_field,
     90     uint16_t field_idx) {
     91   DCHECK(!resolved_field->IsStatic());
     92   ObjPtr<mirror::Class> fields_class = resolved_field->GetDeclaringClass();
     93   bool fast_get = referrer_class != nullptr &&
     94       referrer_class->CanAccessResolvedField(fields_class,
     95                                              resolved_field,
     96                                              dex_cache,
     97                                              field_idx);
     98   bool fast_put = fast_get && (!resolved_field->IsFinal() || fields_class == referrer_class);
     99   return std::make_pair(fast_get, fast_put);
    100 }
    101 
    102 }  // namespace art
    103 
    104 #endif  // ART_DEX2OAT_DRIVER_COMPILER_DRIVER_INL_H_
    105