runtime/mirror/dex_cache.cc - platform/art - Git at Google

 /*
  * Copyright (C) 2011 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.
  */

 #include "dex_cache-inl.h"

 #include "art_method-inl.h"
 #include "class_linker.h"
 #include "gc/accounting/card_table-inl.h"
 #include "gc/heap.h"
 #include "jit/profile_saver.h"
 #include "linear_alloc.h"
 #include "oat_file.h"
 #include "object-inl.h"
 #include "object.h"
 #include "object_array-inl.h"
 #include "reflective_value_visitor.h"
 #include "runtime.h"
 #include "runtime_globals.h"
 #include "string.h"
 #include "thread.h"
 #include "write_barrier.h"

 namespace art {
 namespace mirror {

 void DexCache::Initialize(const DexFile* dex_file, ObjPtr<ClassLoader> class_loader) {
   DCHECK(GetDexFile() == nullptr);
   DCHECK(GetStrings() == nullptr);
   DCHECK(GetResolvedTypes() == nullptr);
   DCHECK(GetResolvedMethods() == nullptr);
   DCHECK(GetResolvedFields() == nullptr);
   DCHECK(GetResolvedMethodTypes() == nullptr);
   DCHECK(GetResolvedCallSites() == nullptr);

   DCHECK(GetStringsArray() == nullptr);
   DCHECK(GetResolvedTypesArray() == nullptr);
   DCHECK(GetResolvedMethodsArray() == nullptr);
   DCHECK(GetResolvedFieldsArray() == nullptr);
   DCHECK(GetResolvedMethodTypesArray() == nullptr);

   ScopedAssertNoThreadSuspension sants(__FUNCTION__);

   SetDexFile(dex_file);
   SetClassLoader(class_loader);
 }

 void DexCache::VisitReflectiveTargets(ReflectiveValueVisitor* visitor) {
   bool wrote = false;
   auto* fields = GetResolvedFields();
   size_t num_fields = NumResolvedFields();
   // Check both the data pointer and count since the array might be initialized
   // concurrently on other thread, and we might observe just one of the values.
   for (size_t i = 0; fields != nullptr && i < num_fields; i++) {
     auto pair(fields->GetNativePair(i));
     if (pair.index == NativeDexCachePair<ArtField>::InvalidIndexForSlot(i)) {
       continue;
     }
     ArtField* new_val = visitor->VisitField(
         pair.object, DexCacheSourceInfo(kSourceDexCacheResolvedField, pair.index, this));
     if (UNLIKELY(new_val != pair.object)) {
       if (new_val == nullptr) {
         pair = NativeDexCachePair<ArtField>(
             nullptr, NativeDexCachePair<ArtField>::InvalidIndexForSlot(i));
       } else {
         pair.object = new_val;
       }
       fields->SetNativePair(i, pair);
       wrote = true;
     }
   }
   auto* methods = GetResolvedMethods();
   size_t num_methods = NumResolvedMethods();
   // Check both the data pointer and count since the array might be initialized
   // concurrently on other thread, and we might observe just one of the values.
   for (size_t i = 0; methods != nullptr && i < num_methods; i++) {
     auto pair(methods->GetNativePair(i));
     if (pair.index == NativeDexCachePair<ArtMethod>::InvalidIndexForSlot(i)) {
       continue;
     }
     ArtMethod* new_val = visitor->VisitMethod(
         pair.object, DexCacheSourceInfo(kSourceDexCacheResolvedMethod, pair.index, this));
     if (UNLIKELY(new_val != pair.object)) {
       if (new_val == nullptr) {
         pair = NativeDexCachePair<ArtMethod>(
             nullptr, NativeDexCachePair<ArtMethod>::InvalidIndexForSlot(i));
       } else {
         pair.object = new_val;
       }
       methods->SetNativePair(i, pair);
       wrote = true;
     }
   }

   auto* fields_array = GetResolvedFieldsArray();
   num_fields = NumResolvedFieldsArray();
   for (size_t i = 0; fields_array != nullptr && i < num_fields; i++) {
     ArtField* old_val = fields_array->Get(i);
     if (old_val == nullptr) {
       continue;
     }
     ArtField* new_val = visitor->VisitField(
         old_val, DexCacheSourceInfo(kSourceDexCacheResolvedField, i, this));
     if (new_val != old_val) {
       fields_array->Set(i, new_val);
       wrote = true;
     }
   }

   auto* methods_array = GetResolvedMethodsArray();
   num_methods = NumResolvedMethodsArray();
   for (size_t i = 0; methods_array != nullptr && i < num_methods; i++) {
     ArtMethod* old_val = methods_array->Get(i);
     if (old_val == nullptr) {
       continue;
     }
     ArtMethod* new_val = visitor->VisitMethod(
         old_val, DexCacheSourceInfo(kSourceDexCacheResolvedMethod, i, this));
     if (new_val != old_val) {
       methods_array->Set(i, new_val);
       wrote = true;
     }
   }

   if (wrote) {
     WriteBarrier::ForEveryFieldWrite(this);
   }
 }

 void DexCache::ResetNativeArrays() {
   SetStrings(nullptr);
   SetResolvedTypes(nullptr);
   SetResolvedMethods(nullptr);
   SetResolvedFields(nullptr);
   SetResolvedMethodTypes(nullptr);
   SetResolvedCallSites(nullptr);

   SetStringsArray(nullptr);
   SetResolvedTypesArray(nullptr);
   SetResolvedMethodsArray(nullptr);
   SetResolvedFieldsArray(nullptr);
   SetResolvedMethodTypesArray(nullptr);
 }

 void DexCache::SetLocation(ObjPtr<mirror::String> location) {
   SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(DexCache, location_), location);
 }

 void DexCache::SetClassLoader(ObjPtr<ClassLoader> class_loader) {
   SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(DexCache, class_loader_), class_loader);
 }

 ObjPtr<ClassLoader> DexCache::GetClassLoader() {
   return GetFieldObject<ClassLoader>(OFFSET_OF_OBJECT_MEMBER(DexCache, class_loader_));
 }

 bool DexCache::ShouldAllocateFullArrayAtStartup() {
   Runtime* runtime = Runtime::Current();
   if (runtime->IsAotCompiler()) {
     // To save on memory in dex2oat, we don't allocate full arrays by default.
     return false;
   }

   if (runtime->GetStartupCompleted()) {
     // We only allocate full arrays during app startup.
     return false;
   }

   if (GetClassLoader() == nullptr) {
     // Only allocate full array for app dex files (also note that for
     // multi-image, the `GetCompilerFilter` call below does not work for
     // non-primary oat files).
     return false;
   }

   const OatDexFile* oat_dex_file = GetDexFile()->GetOatDexFile();
   if (oat_dex_file != nullptr &&
       CompilerFilter::IsAotCompilationEnabled(oat_dex_file->GetOatFile()->GetCompilerFilter())) {
     // We only allocate full arrays for dex files where we do not have
     // compilation.
     return false;
   }

   if (!ProfileSaver::IsStarted()) {
     // Only allocate full arrays if the profile saver is running: if the app
     // does not call `reportFullyDrawn`, then only the profile saver will notify
     // that the app has eventually started.
     return false;
   }

   return true;
 }

 void DexCache::UnlinkStartupCaches() {
   if (GetDexFile() == nullptr) {
     // Unused dex cache.
     return;
   }
   UnlinkStringsArrayIfStartup();
   UnlinkResolvedFieldsArrayIfStartup();
   UnlinkResolvedMethodsArrayIfStartup();
   UnlinkResolvedTypesArrayIfStartup();
   UnlinkResolvedMethodTypesArrayIfStartup();
 }

 void DexCache::SetResolvedType(dex::TypeIndex type_idx, ObjPtr<Class> resolved) {
   DCHECK(resolved != nullptr);
   DCHECK(resolved->IsResolved()) << resolved->GetStatus();
   // TODO default transaction support.
   // Use a release store for SetResolvedType. This is done to prevent other threads from seeing a
   // class but not necessarily seeing the loaded members like the static fields array.
   // See b/32075261.
   SetResolvedTypesEntry(type_idx.index_, resolved.Ptr());
   // TODO: Fine-grained marking, so that we don't need to go through all arrays in full.
   WriteBarrier::ForEveryFieldWrite(this);

   if (this == resolved->GetDexCache()) {
     // If we're updating the dex cache of the class, optimistically update the cache for methods and
     // fields if the caches are full arrays.
     auto* resolved_methods = GetResolvedMethodsArray();
     if (resolved_methods != nullptr) {
       PointerSize pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
       // Because there could be duplicate method entries, we make sure we only
       // update the cache with the first one found to be consistent with method
       // resolution.
       uint32_t previous_method_index = dex::kDexNoIndex;
       for (ArtMethod& current_method : resolved->GetDeclaredMethods(pointer_size)) {
         uint32_t new_index = current_method.GetDexMethodIndex();
         if (new_index != previous_method_index) {
           resolved_methods->Set(new_index, &current_method);
           previous_method_index = new_index;
         }
       }
     }
     auto* resolved_fields = GetResolvedFieldsArray();
     if (resolved_fields != nullptr) {
       for (ArtField& current_field : resolved->GetSFields()) {
         resolved_fields->Set(current_field.GetDexFieldIndex(), &current_field);
       }
       for (ArtField& current_field : resolved->GetIFields()) {
         resolved_fields->Set(current_field.GetDexFieldIndex(), &current_field);
       }
     }
   }
 }

 }  // namespace mirror
 }  // namespace art
	/*
	* Copyright (C) 2011 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.
	*/

	#include "dex_cache-inl.h"

	#include "art_method-inl.h"
	#include "class_linker.h"
	#include "gc/accounting/card_table-inl.h"
	#include "gc/heap.h"
	#include "jit/profile_saver.h"
	#include "linear_alloc.h"
	#include "oat_file.h"
	#include "object-inl.h"
	#include "object.h"
	#include "object_array-inl.h"
	#include "reflective_value_visitor.h"
	#include "runtime.h"
	#include "runtime_globals.h"
	#include "string.h"
	#include "thread.h"
	#include "write_barrier.h"

	namespace art {
	namespace mirror {

	void DexCache::Initialize(const DexFile* dex_file, ObjPtr<ClassLoader> class_loader) {
	DCHECK(GetDexFile() == nullptr);
	DCHECK(GetStrings() == nullptr);
	DCHECK(GetResolvedTypes() == nullptr);
	DCHECK(GetResolvedMethods() == nullptr);
	DCHECK(GetResolvedFields() == nullptr);
	DCHECK(GetResolvedMethodTypes() == nullptr);
	DCHECK(GetResolvedCallSites() == nullptr);

	DCHECK(GetStringsArray() == nullptr);
	DCHECK(GetResolvedTypesArray() == nullptr);
	DCHECK(GetResolvedMethodsArray() == nullptr);
	DCHECK(GetResolvedFieldsArray() == nullptr);
	DCHECK(GetResolvedMethodTypesArray() == nullptr);

	ScopedAssertNoThreadSuspension sants(__FUNCTION__);

	SetDexFile(dex_file);
	SetClassLoader(class_loader);
	}

	void DexCache::VisitReflectiveTargets(ReflectiveValueVisitor* visitor) {
	bool wrote = false;
	auto* fields = GetResolvedFields();
	size_t num_fields = NumResolvedFields();
	// Check both the data pointer and count since the array might be initialized
	// concurrently on other thread, and we might observe just one of the values.
	for (size_t i = 0; fields != nullptr && i < num_fields; i++) {
	auto pair(fields->GetNativePair(i));
	if (pair.index == NativeDexCachePair<ArtField>::InvalidIndexForSlot(i)) {
	continue;
	}
	ArtField* new_val = visitor->VisitField(
	pair.object, DexCacheSourceInfo(kSourceDexCacheResolvedField, pair.index, this));
	if (UNLIKELY(new_val != pair.object)) {
	if (new_val == nullptr) {
	pair = NativeDexCachePair<ArtField>(
	nullptr, NativeDexCachePair<ArtField>::InvalidIndexForSlot(i));
	} else {
	pair.object = new_val;
	}
	fields->SetNativePair(i, pair);
	wrote = true;
	}
	}
	auto* methods = GetResolvedMethods();
	size_t num_methods = NumResolvedMethods();
	// Check both the data pointer and count since the array might be initialized
	// concurrently on other thread, and we might observe just one of the values.
	for (size_t i = 0; methods != nullptr && i < num_methods; i++) {
	auto pair(methods->GetNativePair(i));
	if (pair.index == NativeDexCachePair<ArtMethod>::InvalidIndexForSlot(i)) {
	continue;
	}
	ArtMethod* new_val = visitor->VisitMethod(
	pair.object, DexCacheSourceInfo(kSourceDexCacheResolvedMethod, pair.index, this));
	if (UNLIKELY(new_val != pair.object)) {
	if (new_val == nullptr) {
	pair = NativeDexCachePair<ArtMethod>(
	nullptr, NativeDexCachePair<ArtMethod>::InvalidIndexForSlot(i));
	} else {
	pair.object = new_val;
	}
	methods->SetNativePair(i, pair);
	wrote = true;
	}
	}

	auto* fields_array = GetResolvedFieldsArray();
	num_fields = NumResolvedFieldsArray();
	for (size_t i = 0; fields_array != nullptr && i < num_fields; i++) {
	ArtField* old_val = fields_array->Get(i);
	if (old_val == nullptr) {
	continue;
	}
	ArtField* new_val = visitor->VisitField(
	old_val, DexCacheSourceInfo(kSourceDexCacheResolvedField, i, this));
	if (new_val != old_val) {
	fields_array->Set(i, new_val);
	wrote = true;
	}
	}

	auto* methods_array = GetResolvedMethodsArray();
	num_methods = NumResolvedMethodsArray();
	for (size_t i = 0; methods_array != nullptr && i < num_methods; i++) {
	ArtMethod* old_val = methods_array->Get(i);
	if (old_val == nullptr) {
	continue;
	}
	ArtMethod* new_val = visitor->VisitMethod(
	old_val, DexCacheSourceInfo(kSourceDexCacheResolvedMethod, i, this));
	if (new_val != old_val) {
	methods_array->Set(i, new_val);
	wrote = true;
	}
	}

	if (wrote) {
	WriteBarrier::ForEveryFieldWrite(this);
	}
	}

	void DexCache::ResetNativeArrays() {
	SetStrings(nullptr);
	SetResolvedTypes(nullptr);
	SetResolvedMethods(nullptr);
	SetResolvedFields(nullptr);
	SetResolvedMethodTypes(nullptr);
	SetResolvedCallSites(nullptr);

	SetStringsArray(nullptr);
	SetResolvedTypesArray(nullptr);
	SetResolvedMethodsArray(nullptr);
	SetResolvedFieldsArray(nullptr);
	SetResolvedMethodTypesArray(nullptr);
	}

	void DexCache::SetLocation(ObjPtr<mirror::String> location) {
	SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(DexCache, location_), location);
	}

	void DexCache::SetClassLoader(ObjPtr<ClassLoader> class_loader) {
	SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(DexCache, class_loader_), class_loader);
	}

	ObjPtr<ClassLoader> DexCache::GetClassLoader() {
	return GetFieldObject<ClassLoader>(OFFSET_OF_OBJECT_MEMBER(DexCache, class_loader_));
	}

	bool DexCache::ShouldAllocateFullArrayAtStartup() {
	Runtime* runtime = Runtime::Current();
	if (runtime->IsAotCompiler()) {
	// To save on memory in dex2oat, we don't allocate full arrays by default.
	return false;
	}

	if (runtime->GetStartupCompleted()) {
	// We only allocate full arrays during app startup.
	return false;
	}

	if (GetClassLoader() == nullptr) {
	// Only allocate full array for app dex files (also note that for
	// multi-image, the `GetCompilerFilter` call below does not work for
	// non-primary oat files).
	return false;
	}

	const OatDexFile* oat_dex_file = GetDexFile()->GetOatDexFile();
	if (oat_dex_file != nullptr &&
	CompilerFilter::IsAotCompilationEnabled(oat_dex_file->GetOatFile()->GetCompilerFilter())) {
	// We only allocate full arrays for dex files where we do not have
	// compilation.
	return false;
	}

	if (!ProfileSaver::IsStarted()) {
	// Only allocate full arrays if the profile saver is running: if the app
	// does not call `reportFullyDrawn`, then only the profile saver will notify
	// that the app has eventually started.
	return false;
	}

	return true;
	}

	void DexCache::UnlinkStartupCaches() {
	if (GetDexFile() == nullptr) {
	// Unused dex cache.
	return;
	}
	UnlinkStringsArrayIfStartup();
	UnlinkResolvedFieldsArrayIfStartup();
	UnlinkResolvedMethodsArrayIfStartup();
	UnlinkResolvedTypesArrayIfStartup();
	UnlinkResolvedMethodTypesArrayIfStartup();
	}

	void DexCache::SetResolvedType(dex::TypeIndex type_idx, ObjPtr<Class> resolved) {
	DCHECK(resolved != nullptr);
	DCHECK(resolved->IsResolved()) << resolved->GetStatus();
	// TODO default transaction support.
	// Use a release store for SetResolvedType. This is done to prevent other threads from seeing a
	// class but not necessarily seeing the loaded members like the static fields array.
	// See b/32075261.
	SetResolvedTypesEntry(type_idx.index_, resolved.Ptr());
	// TODO: Fine-grained marking, so that we don't need to go through all arrays in full.
	WriteBarrier::ForEveryFieldWrite(this);

	if (this == resolved->GetDexCache()) {
	// If we're updating the dex cache of the class, optimistically update the cache for methods and
	// fields if the caches are full arrays.
	auto* resolved_methods = GetResolvedMethodsArray();
	if (resolved_methods != nullptr) {
	PointerSize pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
	// Because there could be duplicate method entries, we make sure we only
	// update the cache with the first one found to be consistent with method
	// resolution.
	uint32_t previous_method_index = dex::kDexNoIndex;
	for (ArtMethod& current_method : resolved->GetDeclaredMethods(pointer_size)) {
	uint32_t new_index = current_method.GetDexMethodIndex();
	if (new_index != previous_method_index) {
	resolved_methods->Set(new_index, &current_method);
	previous_method_index = new_index;
	}
	}
	}
	auto* resolved_fields = GetResolvedFieldsArray();
	if (resolved_fields != nullptr) {
	for (ArtField& current_field : resolved->GetSFields()) {
	resolved_fields->Set(current_field.GetDexFieldIndex(), &current_field);
	}
	for (ArtField& current_field : resolved->GetIFields()) {
	resolved_fields->Set(current_field.GetDexFieldIndex(), &current_field);
	}
	}
	}
	}

	} // namespace mirror
	} // namespace art