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342 lines
15 KiB
342 lines
15 KiB
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_RUNTIME_GC_SPACE_IMAGE_SPACE_H_
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#define ART_RUNTIME_GC_SPACE_IMAGE_SPACE_H_
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#include "gc/accounting/space_bitmap.h"
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#include "image.h"
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#include "space.h"
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namespace art {
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template <typename T> class ArrayRef;
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class DexFile;
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enum class InstructionSet;
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class OatFile;
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namespace gc {
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namespace space {
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// An image space is a space backed with a memory mapped image.
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class ImageSpace : public MemMapSpace {
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public:
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SpaceType GetType() const override {
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return kSpaceTypeImageSpace;
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}
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// The separator for boot image location components.
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static constexpr char kComponentSeparator = ':';
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// The separator for profile filename.
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static constexpr char kProfileSeparator = '!';
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// Load boot image spaces for specified boot class path, image location, instruction set, etc.
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//
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// On successful return, the loaded spaces are added to boot_image_spaces (which must be
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// empty on entry) and `extra_reservation` is set to the requested reservation located
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// after the end of the last loaded oat file.
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//
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// IMAGE LOCATION
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//
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// The "image location" is a colon-separated list that specifies one or more
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// components by name and may also specify search paths for extensions
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// corresponding to the remaining boot class path (BCP) extensions.
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//
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// The primary boot image can be specified as one of
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// <path>/<base-name>
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// <base-name>
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// and the path of the first BCP component is used for the second form.
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//
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// Named extension specifications must correspond to an expansion of the
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// <base-name> with a BCP component (for example boot.art with the BCP
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// component name <jar-path>/framework.jar expands to boot-framework.art).
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// They can be similarly specified as one of
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// <ext-path>/<ext-name>
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// <ext-name>
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// and must be listed in the order of their corresponding BCP components.
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// The specification may have a suffix with profile specification, one of
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// !<ext-path>/<ext-name>
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// !<ext-name>
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// and this profile will be used to compile the extension when loading the
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// boot image if the on-disk version is not acceptable (either not present
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// or fails validation, presumably because it's out of date). The first
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// extension specification that includes the profile specification also
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// terminates the list of the boot image dependencies that each extension
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// is compiled against.
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//
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// Search paths for remaining extensions can be specified after named
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// components as one of
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// <search-path>/*
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// *
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// where the second form means that the path of a particular BCP component
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// should be used to search for that component's boot image extension.
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//
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// The actual filename shall be derived from the specified locations using
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// `GetSystemImageFilename()` or `GetDalvikCacheFilename()`.
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//
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// Example image locations:
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// /system/framework/boot.art
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// - only primary boot image with full path.
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// boot.art:boot-framework.art
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// - primary and one extension, use BCP component paths.
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// /apex/com.android.art/boot.art:*
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// - primary with exact location, search for the rest based on BCP
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// component paths.
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// boot.art:/system/framework/*
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// - primary based on BCP component path, search for extensions in
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// /system/framework.
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// /apex/com.android.art/boot.art:/system/framework/*:*
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// - primary with exact location, search for extensions first in
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// /system/framework, then in the corresponding BCP component path.
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// /apex/com.android.art/boot.art:*:/system/framework/*
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// - primary with exact location, search for extensions first in the
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// corresponding BCP component path and then in /system/framework.
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// /apex/com.android.art/boot.art:*:boot-framework.jar
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// - invalid, named components may not follow search paths.
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// boot.art:boot-framework.jar!/system/framework/framework.prof
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// - primary and one extension, use BCP component paths; if extension
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// is not found or broken compile it in memory using the specified
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// profile file from the exact path.
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// boot.art:boot-framework.jar:conscrypt.jar!conscrypt.prof
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// - primary and two extensions, use BCP component paths; only the
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// second extension has a profile file and can be compiled in memory
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// when it is not found or broken, using the specified profile file
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// in the BCP component path and it is compiled against the primary
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// and first extension and only if the first extension is OK.
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// boot.art:boot-framework.jar!framework.prof:conscrypt.jar!conscrypt.prof
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// - primary and two extensions, use BCP component paths; if any
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// extension is not found or broken compile it in memory using
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// the specified profile file in the BCP component path, each
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// extension is compiled only against the primary boot image.
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static bool LoadBootImage(
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const std::vector<std::string>& boot_class_path,
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const std::vector<std::string>& boot_class_path_locations,
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const std::string& image_location,
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const InstructionSet image_isa,
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bool relocate,
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bool executable,
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size_t extra_reservation_size,
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/*out*/std::vector<std::unique_ptr<ImageSpace>>* boot_image_spaces,
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/*out*/MemMap* extra_reservation) REQUIRES_SHARED(Locks::mutator_lock_);
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// Try to open an existing app image space for an oat file,
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// using the boot image spaces from the current Runtime.
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static std::unique_ptr<ImageSpace> CreateFromAppImage(const char* image,
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const OatFile* oat_file,
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std::string* error_msg)
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REQUIRES_SHARED(Locks::mutator_lock_);
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// Try to open an existing app image space for an the oat file and given boot image spaces.
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static std::unique_ptr<ImageSpace> CreateFromAppImage(
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const char* image,
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const OatFile* oat_file,
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ArrayRef<ImageSpace* const> boot_image_spaces,
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std::string* error_msg) REQUIRES_SHARED(Locks::mutator_lock_);
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// Checks whether we have a primary boot image on the disk.
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static bool IsBootClassPathOnDisk(InstructionSet image_isa);
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// Give access to the OatFile.
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const OatFile* GetOatFile() const;
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// Releases the OatFile from the ImageSpace so it can be transfer to
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// the caller, presumably the OatFileManager.
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std::unique_ptr<const OatFile> ReleaseOatFile();
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void VerifyImageAllocations()
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REQUIRES_SHARED(Locks::mutator_lock_);
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const ImageHeader& GetImageHeader() const {
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return *reinterpret_cast<ImageHeader*>(Begin());
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}
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// Actual filename where image was loaded from.
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// For example: /data/dalvik-cache/arm/system@framework@boot.art
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const std::string GetImageFilename() const {
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return GetName();
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}
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// Symbolic location for image.
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// For example: /system/framework/boot.art
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const std::string GetImageLocation() const {
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return image_location_;
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}
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const std::string GetProfileFile() const {
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return profile_file_;
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}
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accounting::ContinuousSpaceBitmap* GetLiveBitmap() override {
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return &live_bitmap_;
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}
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accounting::ContinuousSpaceBitmap* GetMarkBitmap() override {
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// ImageSpaces have the same bitmap for both live and marked. This helps reduce the number of
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// special cases to test against.
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return &live_bitmap_;
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}
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// Compute the number of components in the image (contributing jar files).
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size_t GetComponentCount() const {
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return GetImageHeader().GetComponentCount();
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}
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void Dump(std::ostream& os) const override;
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// Sweeping image spaces is a NOP.
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void Sweep(bool /* swap_bitmaps */, size_t* /* freed_objects */, size_t* /* freed_bytes */) {
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}
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bool CanMoveObjects() const override {
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return false;
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}
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// Returns the filename of the image corresponding to
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// requested image_location, or the filename where a new image
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// should be written if one doesn't exist. Looks for a generated
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// image in the specified location and then in the dalvik-cache.
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//
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// Returns true if an image was found, false otherwise.
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static bool FindImageFilename(const char* image_location,
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InstructionSet image_isa,
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std::string* system_location,
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bool* has_system);
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// The leading character in an image checksum part of boot class path checksums.
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static constexpr char kImageChecksumPrefix = 'i';
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// The leading character in a dex file checksum part of boot class path checksums.
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static constexpr char kDexFileChecksumPrefix = 'd';
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// Returns the checksums for the boot image, extensions and extra boot class path dex files,
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// based on the image spaces and boot class path dex files loaded in memory.
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// The `image_spaces` must correspond to the head of the `boot_class_path`.
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static std::string GetBootClassPathChecksums(ArrayRef<ImageSpace* const> image_spaces,
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ArrayRef<const DexFile* const> boot_class_path);
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// Returns the total number of components (jar files) associated with the image spaces.
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static size_t GetNumberOfComponents(ArrayRef<gc::space::ImageSpace* const> image_spaces);
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// Returns whether the checksums are valid for the given boot class path,
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// image location and ISA (may differ from the ISA of an initialized Runtime).
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// The boot image and dex files do not need to be loaded in memory.
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static bool VerifyBootClassPathChecksums(std::string_view oat_checksums,
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std::string_view oat_boot_class_path,
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const std::string& image_location,
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ArrayRef<const std::string> boot_class_path_locations,
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ArrayRef<const std::string> boot_class_path,
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InstructionSet image_isa,
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/*out*/std::string* error_msg);
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// Returns whether the oat checksums and boot class path description are valid
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// for the given boot image spaces and boot class path. Used for boot image extensions.
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static bool VerifyBootClassPathChecksums(
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std::string_view oat_checksums,
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std::string_view oat_boot_class_path,
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ArrayRef<const std::unique_ptr<ImageSpace>> image_spaces,
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ArrayRef<const std::string> boot_class_path_locations,
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ArrayRef<const std::string> boot_class_path,
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/*out*/std::string* error_msg);
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// Expand a single image location to multi-image locations based on the dex locations.
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static std::vector<std::string> ExpandMultiImageLocations(
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ArrayRef<const std::string> dex_locations,
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const std::string& image_location,
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bool boot_image_extension = false);
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// Returns true if the dex checksums in the given oat file match the
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// checksums of the original dex files on disk. This is intended to be used
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// to validate the boot image oat file, which may contain dex entries from
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// multiple different (possibly multidex) dex files on disk. Prefer the
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// OatFileAssistant for validating regular app oat files because the
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// OatFileAssistant caches dex checksums that are reused to check both the
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// oat and odex file.
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//
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// This function is exposed for testing purposes.
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static bool ValidateOatFile(const OatFile& oat_file, std::string* error_msg);
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// Return the end of the image which includes non-heap objects such as ArtMethods and ArtFields.
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uint8_t* GetImageEnd() const {
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return Begin() + GetImageHeader().GetImageSize();
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}
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void DumpSections(std::ostream& os) const;
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// De-initialize the image-space by undoing the effects in Init().
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virtual ~ImageSpace();
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void ReleaseMetadata() REQUIRES_SHARED(Locks::mutator_lock_);
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protected:
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// Tries to initialize an ImageSpace from the given image path, returning null on error.
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//
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// If validate_oat_file is false (for /system), do not verify that image's OatFile is up-to-date
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// relative to its DexFile inputs. Otherwise (for /data), validate the inputs and generate the
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// OatFile in /data/dalvik-cache if necessary. If the oat_file is null, it uses the oat file from
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// the image.
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static std::unique_ptr<ImageSpace> Init(const char* image_filename,
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const char* image_location,
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bool validate_oat_file,
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const OatFile* oat_file,
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std::string* error_msg)
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REQUIRES_SHARED(Locks::mutator_lock_);
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static Atomic<uint32_t> bitmap_index_;
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accounting::ContinuousSpaceBitmap live_bitmap_;
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ImageSpace(const std::string& name,
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const char* image_location,
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const char* profile_file,
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MemMap&& mem_map,
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accounting::ContinuousSpaceBitmap&& live_bitmap,
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uint8_t* end);
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// The OatFile associated with the image during early startup to
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// reserve space contiguous to the image. It is later released to
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// the ClassLinker during it's initialization.
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std::unique_ptr<OatFile> oat_file_;
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// There are times when we need to find the boot image oat file. As
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// we release ownership during startup, keep a non-owned reference.
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const OatFile* oat_file_non_owned_;
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const std::string image_location_;
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const std::string profile_file_;
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friend class Space;
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private:
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class BootImageLayout;
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class BootImageLoader;
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template <typename ReferenceVisitor>
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class ClassTableVisitor;
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class RemapInternedStringsVisitor;
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class Loader;
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template <typename PatchObjectVisitor>
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class PatchArtFieldVisitor;
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template <PointerSize kPointerSize, typename PatchObjectVisitor, typename PatchCodeVisitor>
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class PatchArtMethodVisitor;
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template <PointerSize kPointerSize, typename HeapVisitor, typename NativeVisitor>
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class PatchObjectVisitor;
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DISALLOW_COPY_AND_ASSIGN(ImageSpace);
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};
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} // namespace space
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} // namespace gc
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} // namespace art
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#endif // ART_RUNTIME_GC_SPACE_IMAGE_SPACE_H_
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