225 lines
8.7 KiB
C++
225 lines
8.7 KiB
C++
/*
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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 "arch/instruction_set.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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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 {
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return kSpaceTypeImageSpace;
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}
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// Load boot image spaces from a primary image file for a specified instruction set.
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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 oat_file_end is updated with the (page-aligned) end of the last
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// oat file.
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static bool LoadBootImage(const std::string& image_file_name,
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const InstructionSet image_instruction_set,
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std::vector<space::ImageSpace*>* boot_image_spaces,
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uint8_t** oat_file_end)
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REQUIRES_SHARED(Locks::mutator_lock_);
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// Try to open an existing app image space.
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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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// Reads the image header from the specified image location for the
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// instruction set image_isa. Returns null on failure, with
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// reason in error_msg.
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static ImageHeader* ReadImageHeader(const char* image_location,
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InstructionSet image_isa,
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std::string* error_msg);
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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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accounting::ContinuousSpaceBitmap* GetLiveBitmap() const OVERRIDE {
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return live_bitmap_.get();
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}
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accounting::ContinuousSpaceBitmap* GetMarkBitmap() const 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_.get();
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}
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void Dump(std::ostream& os) const;
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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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std::string* data_location,
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bool* dalvik_cache_exists,
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bool* has_data,
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bool *is_global_cache);
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// Use the input image filename to adapt the names in the given boot classpath to establish
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// complete locations for secondary images.
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static void ExtractMultiImageLocations(const std::string& input_image_file_name,
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const std::string& boot_classpath,
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std::vector<std::string>* image_filenames);
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static std::string GetMultiImageBootClassPath(const std::vector<const char*>& dex_locations,
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const std::vector<const char*>& oat_filenames,
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const std::vector<const char*>& image_filenames);
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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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// Return the start of the associated oat file.
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uint8_t* GetOatFileBegin() const {
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return GetImageHeader().GetOatFileBegin();
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}
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// Return the end of the associated oat file.
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uint8_t* GetOatFileEnd() const {
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return GetImageHeader().GetOatFileEnd();
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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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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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std::unique_ptr<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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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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friend class ImageSpaceLoader;
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friend class Space;
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private:
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// Create a boot image space from an image file for a specified instruction
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// set. Cannot be used for future allocation or collected.
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//
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// Create also opens the OatFile associated with the image file so
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// that it be contiguously allocated with the image before the
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// creation of the alloc space. The ReleaseOatFile will later be
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// used to transfer ownership of the OatFile to the ClassLinker when
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// it is initialized.
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static std::unique_ptr<ImageSpace> CreateBootImage(const char* image,
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InstructionSet image_isa,
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bool secondary_image,
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std::string* error_msg)
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REQUIRES_SHARED(Locks::mutator_lock_);
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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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