| /* |
| * 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/art_method.h" |
| #include "mirror/art_method-inl.h" |
| #include "mirror/class_loader.h" |
| #include "mirror/dex_cache.h" |
| #include "mirror/dex_cache-inl.h" |
| #include "mirror/art_field-inl.h" |
| #include "scoped_thread_state_change.h" |
| #include "sirt_ref-inl.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); |
| } |
| |
| inline mirror::ArtMethod* CompilerDriver::ResolveMethod( |
| ScopedObjectAccess& soa, const SirtRef<mirror::DexCache>& dex_cache, |
| const SirtRef<mirror::ClassLoader>& class_loader, const DexCompilationUnit* mUnit, |
| uint32_t method_idx, InvokeType invoke_type) { |
| DCHECK(dex_cache->GetDexFile() == mUnit->GetDexFile()); |
| DCHECK(class_loader.get() == soa.Decode<mirror::ClassLoader*>(mUnit->GetClassLoader())); |
| mirror::ArtMethod* resolved_method = mUnit->GetClassLinker()->ResolveMethod( |
| *mUnit->GetDexFile(), method_idx, dex_cache, class_loader, nullptr, invoke_type); |
| DCHECK_EQ(resolved_method == nullptr, soa.Self()->IsExceptionPending()); |
| if (UNLIKELY(resolved_method == nullptr)) { |
| // Clean up any exception left by type resolution. |
| soa.Self()->ClearException(); |
| return nullptr; |
| } |
| if (UNLIKELY(resolved_method->CheckIncompatibleClassChange(invoke_type))) { |
| // Silently return nullptr on incompatible class change. |
| return nullptr; |
| } |
| return resolved_method; |
| } |
| |
| inline void CompilerDriver::GetResolvedMethodDexFileLocation( |
| mirror::ArtMethod* resolved_method, const DexFile** declaring_dex_file, |
| uint16_t* declaring_class_idx, uint16_t* declaring_method_idx) { |
| mirror::Class* declaring_class = resolved_method->GetDeclaringClass(); |
| *declaring_dex_file = declaring_class->GetDexCache()->GetDexFile(); |
| *declaring_class_idx = declaring_class->GetDexTypeIndex(); |
| *declaring_method_idx = resolved_method->GetDexMethodIndex(); |
| } |
| |
| inline uint16_t CompilerDriver::GetResolvedMethodVTableIndex( |
| mirror::ArtMethod* resolved_method, InvokeType type) { |
| if (type == kVirtual || type == kSuper) { |
| return resolved_method->GetMethodIndex(); |
| } else if (type == kInterface) { |
| return resolved_method->GetDexMethodIndex(); |
| } else { |
| return DexFile::kDexNoIndex16; |
| } |
| } |
| |
| inline int CompilerDriver::IsFastInvoke( |
| ScopedObjectAccess& soa, const SirtRef<mirror::DexCache>& dex_cache, |
| const SirtRef<mirror::ClassLoader>& class_loader, const DexCompilationUnit* mUnit, |
| mirror::Class* referrer_class, mirror::ArtMethod* resolved_method, InvokeType* invoke_type, |
| MethodReference* target_method, const MethodReference* devirt_target, |
| uintptr_t* direct_code, uintptr_t* direct_method) { |
| // Don't try to fast-path if we don't understand the caller's class. |
| if (UNLIKELY(referrer_class == nullptr)) { |
| return 0; |
| } |
| mirror::Class* methods_class = resolved_method->GetDeclaringClass(); |
| if (UNLIKELY(!referrer_class->CanAccessResolvedMethod(methods_class, resolved_method, |
| dex_cache.get(), |
| target_method->dex_method_index))) { |
| return 0; |
| } |
| |
| // Sharpen a virtual call into a direct call when the target is known not to have been |
| // overridden (ie is final). |
| bool can_sharpen_virtual_based_on_type = |
| (*invoke_type == kVirtual) && (resolved_method->IsFinal() || methods_class->IsFinal()); |
| // For invoke-super, ensure the vtable index will be correct to dispatch in the vtable of |
| // the super class. |
| bool can_sharpen_super_based_on_type = (*invoke_type == kSuper) && |
| (referrer_class != methods_class) && referrer_class->IsSubClass(methods_class) && |
| resolved_method->GetMethodIndex() < methods_class->GetVTable()->GetLength() && |
| (methods_class->GetVTable()->Get(resolved_method->GetMethodIndex()) == resolved_method); |
| |
| if (can_sharpen_virtual_based_on_type || can_sharpen_super_based_on_type) { |
| // Sharpen a virtual call into a direct call. The method_idx is into referrer's |
| // dex cache, check that this resolved method is where we expect it. |
| CHECK(target_method->dex_file == mUnit->GetDexFile()); |
| DCHECK(dex_cache.get() == mUnit->GetClassLinker()->FindDexCache(*mUnit->GetDexFile())); |
| CHECK(referrer_class->GetDexCache()->GetResolvedMethod(target_method->dex_method_index) == |
| resolved_method) << PrettyMethod(resolved_method); |
| int stats_flags = kFlagMethodResolved; |
| GetCodeAndMethodForDirectCall(invoke_type, kDirect, false, referrer_class, resolved_method, |
| &stats_flags, target_method, direct_code, direct_method); |
| DCHECK_NE(*invoke_type, kSuper) << PrettyMethod(resolved_method); |
| if (*invoke_type == kDirect) { |
| stats_flags |= kFlagsMethodResolvedVirtualMadeDirect; |
| } |
| return stats_flags; |
| } |
| |
| if ((*invoke_type == kVirtual || *invoke_type == kInterface) && devirt_target != nullptr) { |
| // Post-verification callback recorded a more precise invoke target based on its type info. |
| mirror::ArtMethod* called_method; |
| ClassLinker* class_linker = mUnit->GetClassLinker(); |
| if (LIKELY(devirt_target->dex_file == mUnit->GetDexFile())) { |
| called_method = class_linker->ResolveMethod(*devirt_target->dex_file, |
| devirt_target->dex_method_index, |
| dex_cache, class_loader, NULL, kVirtual); |
| } else { |
| SirtRef<mirror::DexCache> target_dex_cache(soa.Self(), |
| class_linker->FindDexCache(*devirt_target->dex_file)); |
| called_method = class_linker->ResolveMethod(*devirt_target->dex_file, |
| devirt_target->dex_method_index, |
| target_dex_cache, class_loader, NULL, kVirtual); |
| } |
| CHECK(called_method != NULL); |
| CHECK(!called_method->IsAbstract()); |
| int stats_flags = kFlagMethodResolved; |
| GetCodeAndMethodForDirectCall(invoke_type, kDirect, true, referrer_class, called_method, |
| &stats_flags, target_method, direct_code, direct_method); |
| DCHECK_NE(*invoke_type, kSuper); |
| if (*invoke_type == kDirect) { |
| stats_flags |= kFlagsMethodResolvedPreciseTypeDevirtualization; |
| } |
| return stats_flags; |
| } |
| |
| if (UNLIKELY(*invoke_type == kSuper)) { |
| // Unsharpened super calls are suspicious so go slow-path. |
| return 0; |
| } |
| |
| // Sharpening failed so generate a regular resolved method dispatch. |
| int stats_flags = kFlagMethodResolved; |
| GetCodeAndMethodForDirectCall(invoke_type, *invoke_type, false, referrer_class, resolved_method, |
| &stats_flags, target_method, direct_code, direct_method); |
| return stats_flags; |
| } |
| |
| inline bool CompilerDriver::NeedsClassInitialization(mirror::Class* referrer_class, |
| mirror::ArtMethod* resolved_method) { |
| if (!resolved_method->IsStatic()) { |
| return false; |
| } |
| mirror::Class* methods_class = resolved_method->GetDeclaringClass(); |
| // NOTE: Unlike in IsFastStaticField(), we don't check CanAssumeTypeIsPresentInDexCache() here. |
| return methods_class != referrer_class && !methods_class->IsInitialized(); |
| } |
| |
| } // namespace art |
| |
| #endif // ART_COMPILER_DRIVER_COMPILER_DRIVER_INL_H_ |