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 "base/logging.h"
 #include "class_linker.h"
 #include "gc/accounting/card_table-inl.h"
 #include "gc/heap.h"
 #include "globals.h"
 #include "linear_alloc.h"
 #include "object.h"
 #include "object-inl.h"
 #include "object_array-inl.h"
 #include "runtime.h"
 #include "string.h"
 #include "thread.h"
 #include "utils/dex_cache_arrays_layout-inl.h"

 namespace art {
 namespace mirror {

 void DexCache::InitializeDexCache(Thread* self,
                                   ObjPtr<mirror::DexCache> dex_cache,
                                   ObjPtr<mirror::String> location,
                                   const DexFile* dex_file,
                                   LinearAlloc* linear_alloc,
                                   PointerSize image_pointer_size) {
   DCHECK(dex_file != nullptr);
   ScopedAssertNoThreadSuspension sants(__FUNCTION__);
   DexCacheArraysLayout layout(image_pointer_size, dex_file);
   uint8_t* raw_arrays = nullptr;

   const OatDexFile* const oat_dex = dex_file->GetOatDexFile();
   if (oat_dex != nullptr && oat_dex->GetDexCacheArrays() != nullptr) {
     raw_arrays = oat_dex->GetDexCacheArrays();
   } else if (dex_file->NumStringIds() != 0u ||
              dex_file->NumTypeIds() != 0u ||
              dex_file->NumMethodIds() != 0u ||
              dex_file->NumFieldIds() != 0u) {
     // Zero-initialized.
     raw_arrays = reinterpret_cast<uint8_t*>(linear_alloc->Alloc(self, layout.Size()));
   }

   mirror::StringDexCacheType* strings = (dex_file->NumStringIds() == 0u) ? nullptr :
       reinterpret_cast<mirror::StringDexCacheType*>(raw_arrays + layout.StringsOffset());
   GcRoot<mirror::Class>* types = (dex_file->NumTypeIds() == 0u) ? nullptr :
       reinterpret_cast<GcRoot<mirror::Class>*>(raw_arrays + layout.TypesOffset());
   ArtMethod** methods = (dex_file->NumMethodIds() == 0u) ? nullptr :
       reinterpret_cast<ArtMethod**>(raw_arrays + layout.MethodsOffset());
   ArtField** fields = (dex_file->NumFieldIds() == 0u) ? nullptr :
       reinterpret_cast<ArtField**>(raw_arrays + layout.FieldsOffset());

   size_t num_strings = mirror::DexCache::kDexCacheStringCacheSize;
   if (dex_file->NumStringIds() < num_strings) {
     num_strings = dex_file->NumStringIds();
   }

   // Note that we allocate the method type dex caches regardless of this flag,
   // and we make sure here that they're not used by the runtime. This is in the
   // interest of simplicity and to avoid extensive compiler and layout class changes.
   //
   // If this needs to be mitigated in a production system running this code,
   // DexCache::kDexCacheMethodTypeCacheSize can be set to zero.
   mirror::MethodTypeDexCacheType* method_types = nullptr;
   size_t num_method_types = 0;

   if (dex_file->NumProtoIds() < mirror::DexCache::kDexCacheMethodTypeCacheSize) {
     num_method_types = dex_file->NumProtoIds();
   } else {
     num_method_types = mirror::DexCache::kDexCacheMethodTypeCacheSize;
   }

   if (num_method_types > 0) {
     method_types = reinterpret_cast<mirror::MethodTypeDexCacheType*>(
         raw_arrays + layout.MethodTypesOffset());
   }

   GcRoot<mirror::CallSite>* call_sites = (dex_file->NumCallSiteIds() == 0)
       ? nullptr
       : reinterpret_cast<GcRoot<mirror::CallSite>*>(raw_arrays + layout.CallSitesOffset());

   DCHECK_ALIGNED(raw_arrays, alignof(mirror::StringDexCacheType)) <<
                  "Expected raw_arrays to align to StringDexCacheType.";
   DCHECK_ALIGNED(layout.StringsOffset(), alignof(mirror::StringDexCacheType)) <<
                  "Expected StringsOffset() to align to StringDexCacheType.";
   DCHECK_ALIGNED(strings, alignof(mirror::StringDexCacheType)) <<
                  "Expected strings to align to StringDexCacheType.";
   static_assert(alignof(mirror::StringDexCacheType) == 8u,
                 "Expected StringDexCacheType to have align of 8.");
   if (kIsDebugBuild) {
     // Sanity check to make sure all the dex cache arrays are empty. b/28992179
     for (size_t i = 0; i < num_strings; ++i) {
       CHECK_EQ(strings[i].load(std::memory_order_relaxed).index, 0u);
       CHECK(strings[i].load(std::memory_order_relaxed).object.IsNull());
     }
     for (size_t i = 0; i < dex_file->NumTypeIds(); ++i) {
       CHECK(types[i].IsNull());
     }
     for (size_t i = 0; i < dex_file->NumMethodIds(); ++i) {
       CHECK(mirror::DexCache::GetElementPtrSize(methods, i, image_pointer_size) == nullptr);
     }
     for (size_t i = 0; i < dex_file->NumFieldIds(); ++i) {
       CHECK(mirror::DexCache::GetElementPtrSize(fields, i, image_pointer_size) == nullptr);
     }
     for (size_t i = 0; i < num_method_types; ++i) {
       CHECK_EQ(method_types[i].load(std::memory_order_relaxed).index, 0u);
       CHECK(method_types[i].load(std::memory_order_relaxed).object.IsNull());
     }
     for (size_t i = 0; i < dex_file->NumCallSiteIds(); ++i) {
       CHECK(call_sites[i].IsNull());
     }
   }
   if (strings != nullptr) {
     mirror::StringDexCachePair::Initialize(strings);
   }
   if (method_types != nullptr) {
     mirror::MethodTypeDexCachePair::Initialize(method_types);
   }
   dex_cache->Init(dex_file,
                   location,
                   strings,
                   num_strings,
                   types,
                   dex_file->NumTypeIds(),
                   methods,
                   dex_file->NumMethodIds(),
                   fields,
                   dex_file->NumFieldIds(),
                   method_types,
                   num_method_types,
                   call_sites,
                   dex_file->NumCallSiteIds(),
                   image_pointer_size);
 }

 void DexCache::Init(const DexFile* dex_file,
                     ObjPtr<String> location,
                     StringDexCacheType* strings,
                     uint32_t num_strings,
                     GcRoot<Class>* resolved_types,
                     uint32_t num_resolved_types,
                     ArtMethod** resolved_methods,
                     uint32_t num_resolved_methods,
                     ArtField** resolved_fields,
                     uint32_t num_resolved_fields,
                     MethodTypeDexCacheType* resolved_method_types,
                     uint32_t num_resolved_method_types,
                     GcRoot<CallSite>* resolved_call_sites,
                     uint32_t num_resolved_call_sites,
                     PointerSize pointer_size) {
   CHECK(dex_file != nullptr);
   CHECK(location != nullptr);
   CHECK_EQ(num_strings != 0u, strings != nullptr);
   CHECK_EQ(num_resolved_types != 0u, resolved_types != nullptr);
   CHECK_EQ(num_resolved_methods != 0u, resolved_methods != nullptr);
   CHECK_EQ(num_resolved_fields != 0u, resolved_fields != nullptr);
   CHECK_EQ(num_resolved_method_types != 0u, resolved_method_types != nullptr);
   CHECK_EQ(num_resolved_call_sites != 0u, resolved_call_sites != nullptr);

   SetDexFile(dex_file);
   SetLocation(location);
   SetStrings(strings);
   SetResolvedTypes(resolved_types);
   SetResolvedMethods(resolved_methods);
   SetResolvedFields(resolved_fields);
   SetResolvedMethodTypes(resolved_method_types);
   SetResolvedCallSites(resolved_call_sites);
   SetField32<false>(NumStringsOffset(), num_strings);
   SetField32<false>(NumResolvedTypesOffset(), num_resolved_types);
   SetField32<false>(NumResolvedMethodsOffset(), num_resolved_methods);
   SetField32<false>(NumResolvedFieldsOffset(), num_resolved_fields);
   SetField32<false>(NumResolvedMethodTypesOffset(), num_resolved_method_types);
   SetField32<false>(NumResolvedCallSitesOffset(), num_resolved_call_sites);

   Runtime* const runtime = Runtime::Current();
   if (runtime->HasResolutionMethod()) {
     // Initialize the resolve methods array to contain trampolines for resolution.
     Fixup(runtime->GetResolutionMethod(), pointer_size);
   }
 }

 void DexCache::Fixup(ArtMethod* trampoline, PointerSize pointer_size) {
   // Fixup the resolve methods array to contain trampoline for resolution.
   CHECK(trampoline != nullptr);
   CHECK(trampoline->IsRuntimeMethod());
   auto* resolved_methods = GetResolvedMethods();
   for (size_t i = 0, length = NumResolvedMethods(); i < length; i++) {
     if (GetElementPtrSize<ArtMethod*>(resolved_methods, i, pointer_size) == nullptr) {
       SetElementPtrSize(resolved_methods, i, trampoline, pointer_size);
     }
   }
 }

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

 }  // 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 "base/logging.h"
	#include "class_linker.h"
	#include "gc/accounting/card_table-inl.h"
	#include "gc/heap.h"
	#include "globals.h"
	#include "linear_alloc.h"
	#include "object.h"
	#include "object-inl.h"
	#include "object_array-inl.h"
	#include "runtime.h"
	#include "string.h"
	#include "thread.h"
	#include "utils/dex_cache_arrays_layout-inl.h"

	namespace art {
	namespace mirror {

	void DexCache::InitializeDexCache(Thread* self,
	ObjPtr<mirror::DexCache> dex_cache,
	ObjPtr<mirror::String> location,
	const DexFile* dex_file,
	LinearAlloc* linear_alloc,
	PointerSize image_pointer_size) {
	DCHECK(dex_file != nullptr);
	ScopedAssertNoThreadSuspension sants(__FUNCTION__);
	DexCacheArraysLayout layout(image_pointer_size, dex_file);
	uint8_t* raw_arrays = nullptr;

	const OatDexFile* const oat_dex = dex_file->GetOatDexFile();
	if (oat_dex != nullptr && oat_dex->GetDexCacheArrays() != nullptr) {
	raw_arrays = oat_dex->GetDexCacheArrays();
	} else if (dex_file->NumStringIds() != 0u \|\|
	dex_file->NumTypeIds() != 0u \|\|
	dex_file->NumMethodIds() != 0u \|\|
	dex_file->NumFieldIds() != 0u) {
	// Zero-initialized.
	raw_arrays = reinterpret_cast<uint8_t*>(linear_alloc->Alloc(self, layout.Size()));
	}

	mirror::StringDexCacheType* strings = (dex_file->NumStringIds() == 0u) ? nullptr :
	reinterpret_cast<mirror::StringDexCacheType*>(raw_arrays + layout.StringsOffset());
	GcRoot<mirror::Class>* types = (dex_file->NumTypeIds() == 0u) ? nullptr :
	reinterpret_cast<GcRoot<mirror::Class>*>(raw_arrays + layout.TypesOffset());
	ArtMethod** methods = (dex_file->NumMethodIds() == 0u) ? nullptr :
	reinterpret_cast<ArtMethod**>(raw_arrays + layout.MethodsOffset());
	ArtField** fields = (dex_file->NumFieldIds() == 0u) ? nullptr :
	reinterpret_cast<ArtField**>(raw_arrays + layout.FieldsOffset());

	size_t num_strings = mirror::DexCache::kDexCacheStringCacheSize;
	if (dex_file->NumStringIds() < num_strings) {
	num_strings = dex_file->NumStringIds();
	}

	// Note that we allocate the method type dex caches regardless of this flag,
	// and we make sure here that they're not used by the runtime. This is in the
	// interest of simplicity and to avoid extensive compiler and layout class changes.
	//
	// If this needs to be mitigated in a production system running this code,
	// DexCache::kDexCacheMethodTypeCacheSize can be set to zero.
	mirror::MethodTypeDexCacheType* method_types = nullptr;
	size_t num_method_types = 0;

	if (dex_file->NumProtoIds() < mirror::DexCache::kDexCacheMethodTypeCacheSize) {
	num_method_types = dex_file->NumProtoIds();
	} else {
	num_method_types = mirror::DexCache::kDexCacheMethodTypeCacheSize;
	}

	if (num_method_types > 0) {
	method_types = reinterpret_cast<mirror::MethodTypeDexCacheType*>(
	raw_arrays + layout.MethodTypesOffset());
	}

	GcRoot<mirror::CallSite>* call_sites = (dex_file->NumCallSiteIds() == 0)
	? nullptr
	: reinterpret_cast<GcRoot<mirror::CallSite>*>(raw_arrays + layout.CallSitesOffset());

	DCHECK_ALIGNED(raw_arrays, alignof(mirror::StringDexCacheType)) <<
	"Expected raw_arrays to align to StringDexCacheType.";
	DCHECK_ALIGNED(layout.StringsOffset(), alignof(mirror::StringDexCacheType)) <<
	"Expected StringsOffset() to align to StringDexCacheType.";
	DCHECK_ALIGNED(strings, alignof(mirror::StringDexCacheType)) <<
	"Expected strings to align to StringDexCacheType.";
	static_assert(alignof(mirror::StringDexCacheType) == 8u,
	"Expected StringDexCacheType to have align of 8.");
	if (kIsDebugBuild) {
	// Sanity check to make sure all the dex cache arrays are empty. b/28992179
	for (size_t i = 0; i < num_strings; ++i) {
	CHECK_EQ(strings[i].load(std::memory_order_relaxed).index, 0u);
	CHECK(strings[i].load(std::memory_order_relaxed).object.IsNull());
	}
	for (size_t i = 0; i < dex_file->NumTypeIds(); ++i) {
	CHECK(types[i].IsNull());
	}
	for (size_t i = 0; i < dex_file->NumMethodIds(); ++i) {
	CHECK(mirror::DexCache::GetElementPtrSize(methods, i, image_pointer_size) == nullptr);
	}
	for (size_t i = 0; i < dex_file->NumFieldIds(); ++i) {
	CHECK(mirror::DexCache::GetElementPtrSize(fields, i, image_pointer_size) == nullptr);
	}
	for (size_t i = 0; i < num_method_types; ++i) {
	CHECK_EQ(method_types[i].load(std::memory_order_relaxed).index, 0u);
	CHECK(method_types[i].load(std::memory_order_relaxed).object.IsNull());
	}
	for (size_t i = 0; i < dex_file->NumCallSiteIds(); ++i) {
	CHECK(call_sites[i].IsNull());
	}
	}
	if (strings != nullptr) {
	mirror::StringDexCachePair::Initialize(strings);
	}
	if (method_types != nullptr) {
	mirror::MethodTypeDexCachePair::Initialize(method_types);
	}
	dex_cache->Init(dex_file,
	location,
	strings,
	num_strings,
	types,
	dex_file->NumTypeIds(),
	methods,
	dex_file->NumMethodIds(),
	fields,
	dex_file->NumFieldIds(),
	method_types,
	num_method_types,
	call_sites,
	dex_file->NumCallSiteIds(),
	image_pointer_size);
	}

	void DexCache::Init(const DexFile* dex_file,
	ObjPtr<String> location,
	StringDexCacheType* strings,
	uint32_t num_strings,
	GcRoot<Class>* resolved_types,
	uint32_t num_resolved_types,
	ArtMethod** resolved_methods,
	uint32_t num_resolved_methods,
	ArtField** resolved_fields,
	uint32_t num_resolved_fields,
	MethodTypeDexCacheType* resolved_method_types,
	uint32_t num_resolved_method_types,
	GcRoot<CallSite>* resolved_call_sites,
	uint32_t num_resolved_call_sites,
	PointerSize pointer_size) {
	CHECK(dex_file != nullptr);
	CHECK(location != nullptr);
	CHECK_EQ(num_strings != 0u, strings != nullptr);
	CHECK_EQ(num_resolved_types != 0u, resolved_types != nullptr);
	CHECK_EQ(num_resolved_methods != 0u, resolved_methods != nullptr);
	CHECK_EQ(num_resolved_fields != 0u, resolved_fields != nullptr);
	CHECK_EQ(num_resolved_method_types != 0u, resolved_method_types != nullptr);
	CHECK_EQ(num_resolved_call_sites != 0u, resolved_call_sites != nullptr);

	SetDexFile(dex_file);
	SetLocation(location);
	SetStrings(strings);
	SetResolvedTypes(resolved_types);
	SetResolvedMethods(resolved_methods);
	SetResolvedFields(resolved_fields);
	SetResolvedMethodTypes(resolved_method_types);
	SetResolvedCallSites(resolved_call_sites);
	SetField32<false>(NumStringsOffset(), num_strings);
	SetField32<false>(NumResolvedTypesOffset(), num_resolved_types);
	SetField32<false>(NumResolvedMethodsOffset(), num_resolved_methods);
	SetField32<false>(NumResolvedFieldsOffset(), num_resolved_fields);
	SetField32<false>(NumResolvedMethodTypesOffset(), num_resolved_method_types);
	SetField32<false>(NumResolvedCallSitesOffset(), num_resolved_call_sites);

	Runtime* const runtime = Runtime::Current();
	if (runtime->HasResolutionMethod()) {
	// Initialize the resolve methods array to contain trampolines for resolution.
	Fixup(runtime->GetResolutionMethod(), pointer_size);
	}
	}

	void DexCache::Fixup(ArtMethod* trampoline, PointerSize pointer_size) {
	// Fixup the resolve methods array to contain trampoline for resolution.
	CHECK(trampoline != nullptr);
	CHECK(trampoline->IsRuntimeMethod());
	auto* resolved_methods = GetResolvedMethods();
	for (size_t i = 0, length = NumResolvedMethods(); i < length; i++) {
	if (GetElementPtrSize<ArtMethod*>(resolved_methods, i, pointer_size) == nullptr) {
	SetElementPtrSize(resolved_methods, i, trampoline, pointer_size);
	}
	}
	}

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

	} // namespace mirror
	} // namespace art