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/*
* 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.
*/
#ifndef ART_COMPILER_DRIVER_COMPILER_DRIVER_INL_H_
#define ART_COMPILER_DRIVER_COMPILER_DRIVER_INL_H_
#include "compiler_driver.h"
#include "dex/compiler_ir.h"
#include "mirror/art_field.h"
#include "mirror/art_field-inl.h"
#include "mirror/class_loader.h"
#include "mirror/dex_cache.h"
#include "mirror/art_field-inl.h"
#include "scoped_thread_state_change.h"
namespace art {
inline mirror::DexCache* CompilerDriver::GetDexCache(const DexCompilationUnit* mUnit) {
return mUnit->GetClassLinker()->FindDexCache(*mUnit->GetDexFile());
}
inline mirror::ClassLoader* CompilerDriver::GetClassLoader(ScopedObjectAccess& soa,
const DexCompilationUnit* mUnit) {
return soa.Decode<mirror::ClassLoader*>(mUnit->GetClassLoader());
}
inline mirror::Class* CompilerDriver::ResolveCompilingMethodsClass(
ScopedObjectAccess& soa, const SirtRef<mirror::DexCache>& dex_cache,
const SirtRef<mirror::ClassLoader>& class_loader, const DexCompilationUnit* mUnit) {
DCHECK(dex_cache->GetDexFile() == mUnit->GetDexFile());
DCHECK(class_loader.get() == soa.Decode<mirror::ClassLoader*>(mUnit->GetClassLoader()));
const DexFile::MethodId& referrer_method_id =
mUnit->GetDexFile()->GetMethodId(mUnit->GetDexMethodIndex());
mirror::Class* referrer_class = mUnit->GetClassLinker()->ResolveType(
*mUnit->GetDexFile(), referrer_method_id.class_idx_, dex_cache, class_loader);
DCHECK_EQ(referrer_class == nullptr, soa.Self()->IsExceptionPending());
if (UNLIKELY(referrer_class == nullptr)) {
// Clean up any exception left by type resolution.
soa.Self()->ClearException();
}
return referrer_class;
}
inline mirror::ArtField* CompilerDriver::ResolveField(
ScopedObjectAccess& soa, const SirtRef<mirror::DexCache>& dex_cache,
const SirtRef<mirror::ClassLoader>& class_loader, const DexCompilationUnit* mUnit,
uint32_t field_idx, bool is_static) {
DCHECK(dex_cache->GetDexFile() == mUnit->GetDexFile());
DCHECK(class_loader.get() == soa.Decode<mirror::ClassLoader*>(mUnit->GetClassLoader()));
mirror::ArtField* resolved_field = mUnit->GetClassLinker()->ResolveField(
*mUnit->GetDexFile(), field_idx, dex_cache, class_loader, is_static);
DCHECK_EQ(resolved_field == nullptr, soa.Self()->IsExceptionPending());
if (UNLIKELY(resolved_field == nullptr)) {
// Clean up any exception left by type resolution.
soa.Self()->ClearException();
return nullptr;
}
if (UNLIKELY(resolved_field->IsStatic() != is_static)) {
// ClassLinker can return a field of the wrong kind directly from the DexCache.
// Silently return nullptr on such incompatible class change.
return nullptr;
}
return resolved_field;
}
inline void CompilerDriver::GetResolvedFieldDexFileLocation(
mirror::ArtField* resolved_field, const DexFile** declaring_dex_file,
uint16_t* declaring_class_idx, uint16_t* declaring_field_idx) {
mirror::Class* declaring_class = resolved_field->GetDeclaringClass();
*declaring_dex_file = declaring_class->GetDexCache()->GetDexFile();
*declaring_class_idx = declaring_class->GetDexTypeIndex();
*declaring_field_idx = resolved_field->GetDexFieldIndex();
}
inline bool CompilerDriver::IsFieldVolatile(mirror::ArtField* field) {
return field->IsVolatile();
}
inline std::pair<bool, bool> CompilerDriver::IsFastInstanceField(
mirror::DexCache* dex_cache, mirror::Class* referrer_class,
mirror::ArtField* resolved_field, uint16_t field_idx, MemberOffset* field_offset) {
DCHECK(!resolved_field->IsStatic());
mirror::Class* fields_class = resolved_field->GetDeclaringClass();
bool fast_get = referrer_class != nullptr &&
referrer_class->CanAccessResolvedField(fields_class, resolved_field,
dex_cache, field_idx);
bool fast_put = fast_get && (!resolved_field->IsFinal() || fields_class == referrer_class);
*field_offset = fast_get ? resolved_field->GetOffset() : MemberOffset(0u);
return std::make_pair(fast_get, fast_put);
}
inline std::pair<bool, bool> CompilerDriver::IsFastStaticField(
mirror::DexCache* dex_cache, mirror::Class* referrer_class,
mirror::ArtField* resolved_field, uint16_t field_idx, MemberOffset* field_offset,
uint32_t* storage_index, bool* is_referrers_class, bool* is_initialized) {
DCHECK(resolved_field->IsStatic());
if (LIKELY(referrer_class != nullptr)) {
mirror::Class* fields_class = resolved_field->GetDeclaringClass();
if (fields_class == referrer_class) {
*field_offset = resolved_field->GetOffset();
*storage_index = fields_class->GetDexTypeIndex();
*is_referrers_class = true; // implies no worrying about class initialization
*is_initialized = true;
return std::make_pair(true, true);
}
if (referrer_class->CanAccessResolvedField(fields_class, resolved_field,
dex_cache, field_idx)) {
// We have the resolved field, we must make it into a index for the referrer
// in its static storage (which may fail if it doesn't have a slot for it)
// TODO: for images we can elide the static storage base null check
// if we know there's a non-null entry in the image
const DexFile* dex_file = dex_cache->GetDexFile();
uint32_t storage_idx = DexFile::kDexNoIndex;
if (LIKELY(fields_class->GetDexCache() == dex_cache)) {
// common case where the dex cache of both the referrer and the field are the same,
// no need to search the dex file
storage_idx = fields_class->GetDexTypeIndex();
} else {
// Search dex file for localized ssb index, may fail if field's class is a parent
// of the class mentioned in the dex file and there is no dex cache entry.
const DexFile::StringId* string_id =
dex_file->FindStringId(FieldHelper(resolved_field).GetDeclaringClassDescriptor());
if (string_id != nullptr) {
const DexFile::TypeId* type_id =
dex_file->FindTypeId(dex_file->GetIndexForStringId(*string_id));
if (type_id != nullptr) {
// medium path, needs check of static storage base being initialized
storage_idx = dex_file->GetIndexForTypeId(*type_id);
}
}
}
if (storage_idx != DexFile::kDexNoIndex) {
*field_offset = resolved_field->GetOffset();
*storage_index = storage_idx;
*is_referrers_class = false;
*is_initialized = fields_class->IsInitialized() &&
CanAssumeTypeIsPresentInDexCache(*dex_file, storage_idx);
return std::make_pair(true, !resolved_field->IsFinal());
}
}
}
// Conservative defaults.
*field_offset = MemberOffset(0u);
*storage_index = DexFile::kDexNoIndex;
*is_referrers_class = false;
*is_initialized = false;
return std::make_pair(false, false);
}
} // namespace art
#endif // ART_COMPILER_DRIVER_COMPILER_DRIVER_INL_H_
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