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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
*
* 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.
*/
#ifndef ART_SRC_IMAGE_H_
#define ART_SRC_IMAGE_H_
#include <string.h>
#include "globals.h"
#include "object.h"
namespace art {
// header of image files written by ImageWriter, read and validated by Space.
class PACKED ImageHeader {
public:
ImageHeader() {}
ImageHeader(uint32_t image_begin,
uint32_t image_roots,
uint32_t oat_checksum,
uint32_t oat_begin,
uint32_t oat_end)
: image_begin_(image_begin),
oat_checksum_(oat_checksum),
oat_begin_(oat_begin),
oat_end_(oat_end),
image_roots_(image_roots) {
CHECK_EQ(image_begin, RoundUp(image_begin, kPageSize));
CHECK_EQ(oat_begin, RoundUp(oat_begin, kPageSize));
CHECK_LT(image_begin, image_roots);
CHECK_LT(image_roots, oat_begin);
CHECK_LT(oat_begin, oat_end);
memcpy(magic_, kImageMagic, sizeof(kImageMagic));
memcpy(version_, kImageVersion, sizeof(kImageVersion));
}
bool IsValid() const {
if (memcmp(magic_, kImageMagic, sizeof(kImageMagic) != 0)) {
return false;
}
if (memcmp(version_, kImageVersion, sizeof(kImageVersion) != 0)) {
return false;
}
return true;
}
const char* GetMagic() const {
CHECK(IsValid());
return reinterpret_cast<const char*>(magic_);
}
byte* GetImageBegin() const {
return reinterpret_cast<byte*>(image_begin_);
}
uint32_t GetOatChecksum() const {
return oat_checksum_;
}
byte* GetOatBegin() const {
return reinterpret_cast<byte*>(oat_begin_);
}
byte* GetOatEnd() const {
return reinterpret_cast<byte*>(oat_end_);
}
enum ImageRoot {
kJniStubArray,
kAbstractMethodErrorStubArray,
kInstanceResolutionStubArray,
kStaticResolutionStubArray,
kUnknownMethodResolutionStubArray,
kCalleeSaveMethod,
kRefsOnlySaveMethod,
kRefsAndArgsSaveMethod,
kOatLocation,
kDexCaches,
kClassRoots,
kImageRootsMax,
};
Object* GetImageRoot(ImageRoot image_root) const {
return GetImageRoots()->Get(image_root);
}
private:
ObjectArray<Object>* GetImageRoots() const {
return reinterpret_cast<ObjectArray<Object>*>(image_roots_);
}
static const byte kImageMagic[4];
static const byte kImageVersion[4];
byte magic_[4];
byte version_[4];
// required base address for mapping the image.
uint32_t image_begin_;
// checksum of the oat file we link to for load time sanity check
uint32_t oat_checksum_;
// required oat address expected by image Method::GetCode() pointers.
uint32_t oat_begin_;
// end of oat address range for this image file, used for positioning a following image
uint32_t oat_end_;
// absolute address of an Object[] of objects needed to reinitialize from an image
uint32_t image_roots_;
friend class ImageWriter;
friend class ImageDump; // For GetImageRoots()
};
} // namespace art
#endif // ART_SRC_IMAGE_H_
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