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* 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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include "gc/accounting/space_bitmap.h"
#include "runtime.h"
#include "space.h"
namespace art {
class OatFile;
namespace gc {
namespace space {
// An image space is a space backed with a memory mapped image.
class ImageSpace : public MemMapSpace {
SpaceType GetType() const {
return kSpaceTypeImageSpace;
// Create a Space from an image file for a specified instruction
// set. Cannot be used for future allocation or collected.
// Create also opens the OatFile associated with the image file so
// that it be contiguously allocated with the image before the
// creation of the alloc space. The ReleaseOatFile will later be
// used to transfer ownership of the OatFile to the ClassLinker when
// it is initialized.
static ImageSpace* Create(const char* image, InstructionSet image_isa)
// Reads the image header from the specified image location for the
// instruction set image_isa.
static ImageHeader* ReadImageHeaderOrDie(const char* image_location,
InstructionSet image_isa);
// Give access to the OatFile.
const OatFile* GetOatFile() const;
// Releases the OatFile from the ImageSpace so it can be transfer to
// the caller, presumably the ClassLinker.
OatFile* ReleaseOatFile()
void VerifyImageAllocations()
const ImageHeader& GetImageHeader() const {
return *reinterpret_cast<ImageHeader*>(Begin());
// Actual filename where image was loaded from.
// For example: /data/dalvik-cache/arm/
const std::string GetImageFilename() const {
return GetName();
// Symbolic location for image.
// For example: /system/framework/
const std::string GetImageLocation() const {
return image_location_;
accounting::ContinuousSpaceBitmap* GetLiveBitmap() const OVERRIDE {
return live_bitmap_.get();
accounting::ContinuousSpaceBitmap* GetMarkBitmap() const OVERRIDE {
// ImageSpaces have the same bitmap for both live and marked. This helps reduce the number of
// special cases to test against.
return live_bitmap_.get();
void Dump(std::ostream& os) const;
// Sweeping image spaces is a NOP.
void Sweep(bool /* swap_bitmaps */, size_t* /* freed_objects */, size_t* /* freed_bytes */) {
bool CanMoveObjects() const OVERRIDE {
return false;
// Tries to initialize an ImageSpace from the given image path,
// returning NULL on error.
// If validate_oat_file is false (for /system), do not verify that
// image's OatFile is up-to-date relative to its DexFile
// inputs. Otherwise (for /data), validate the inputs and generate
// the OatFile in /data/dalvik-cache if necessary.
static ImageSpace* Init(const char* image_filename, const char* image_location,
bool validate_oat_file, std::string* error_msg)
// Returns the filename of the image corresponding to
// requested image_location, or the filename where a new image
// should be written if one doesn't exist. Looks for a generated
// image in the specified location and then in the dalvik-cache.
// Returns true if an image was found, false otherwise.
static bool FindImageFilename(const char* image_location,
InstructionSet image_isa,
std::string* location,
bool* is_system);
OatFile* OpenOatFile(const char* image, std::string* error_msg) const
bool ValidateOatFile(std::string* error_msg) const
friend class Space;
static Atomic<uint32_t> bitmap_index_;
std::unique_ptr<accounting::ContinuousSpaceBitmap> live_bitmap_;
ImageSpace(const std::string& name, const char* image_location,
MemMap* mem_map, accounting::ContinuousSpaceBitmap* live_bitmap);
// The OatFile associated with the image during early startup to
// reserve space contiguous to the image. It is later released to
// the ClassLinker during it's initialization.
std::unique_ptr<OatFile> oat_file_;
const std::string image_location_;
} // namespace space
} // namespace gc
} // namespace art