CN102799660A - JAVA card object management method - Google Patents
JAVA card object management method Download PDFInfo
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- CN102799660A CN102799660A CN2012102362544A CN201210236254A CN102799660A CN 102799660 A CN102799660 A CN 102799660A CN 2012102362544 A CN2012102362544 A CN 2012102362544A CN 201210236254 A CN201210236254 A CN 201210236254A CN 102799660 A CN102799660 A CN 102799660A
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Abstract
The invention relates to a JAVA card object management method, comprising the following content: a JAVA card object is jointly composed of an object head and an object body, and the object head and the object body are stored in a stack in a separated manner; the object heads of all the types fixedly occupy eight bytes, and the object body occupies a storage space in different sizes according to concrete content of an object; and certain page blocks are allocated in advance to be taken as a space for the object heads according to the design requirements of a JAVA card. The JAVA card object management method disclosed by the invention improves object creating and access efficiency and is beneficial to more reasonable application to limited storage space of a JAVA intelligent card.
Description
Technical field
The present invention relates to field of intelligent cards, relate in particular to a kind of JAVA card Object Management group method.
Background technology
Smart card is from being born, in decades, and along with the development of integrated circuit technique, computer technology and information security technology; Develop into radio-frequency card even many interface card from contact card; To many application, kind is abundanter from single application development, and it is advanced that technology also more becomes.At present like this, support the smart card software platforms of using to become key, particularly the JAVA card more.Because the JAVA card is to resolve in when operation, so the performance that the locating speed of object can be very big when influencing the operation of JAVA card; In addition, dynamic download, deletion are used behind the JAVA card permission hair fastener, and along with the replacement of user to using, the user's space of JAVA card also is the resource that is of great value; The Object Management group mode of JAVA card also can have influence on the utilization ratio of JAVA card space.In existing realization, the object of JAVA card uses the mode of 2 grades of table indexs, and object takes up room relevant with object type, minimum 8 bytes that take; This Managed Solution; Not only object is resolved, the efficiency ratio of visit lower (need to resolve 2～3 times, just can have access to object), and Object table also need take a large amount of storage space; And laxative object head is represented mode, also storage space has been caused waste.
To the above-mentioned defective of JAVA card technique, the present invention will provide a kind of high efficiency JAVA card Object Management group method, makes things convenient for the location of object, saves the heap space resource, improves the space service efficiency of JAVA card.
Summary of the invention
The purpose of this invention is to provide a kind of high efficiency JAVA card Object Management group method.
The purpose of JAVA card Object Management group method is: quicken the locating speed of object reference in heap space, rationally utilize the space, reduce the wasting of resources.
In order to realize the foregoing invention purpose, the JAVA card Object Management group method that this method provides may further comprise the steps:
The object head of JAVA card object separates in heap with subject; The object head of any kind all fixedly takies 8 byte lengths, and subject then takies different storage space or the ram spaces stored up according to the particular content of JAVA card object.
The object head is distributed in an end in heap space, and the subject then other end in the heap space is distributed or distributed at ram space. For instance, distribute object head space, distribute persistence subject space from the past high address of low address from the past low address of the high address of heap; Perhaps, otherwise, distribute persistence subject space from low address toward high address, distribute object head space from the past low address of the high address of heap.
The bag code institute usage space of JAVA card dynamic download, also the use-pattern with the subject space is identical.
Allocate some object head spaces in advance, and carry out initialization; When has used in the object head space of reserving, be that unit applies for free space again with a Page of storer, but, need to guarantee the continuity in object head space.
The object header is 8 bytes, because all types object all is an equal length, so the object head is that unit carries out the storage space application with Page; The Page space of application is an object head piece according to per 8 bytes, carries out independent space management again; Each Page need reserve 8 initial bytes, as Page management information, and the situation whether purposes of this 8 byte is used for each object head among this Page of sign.
A bit position during all corresponding Page leader of each object head piece is known, bit position 1 shows that this block space is assigned with; Bit shows that for putting 0 this object head piece is for idle.
When new object is created; At first apply for object head space: begin from heap object head usage space; The identification byte of each Page head of sequential search determines whether the idle object head piece that is not used among this Page, if having; Then the object head of free time is distributed to the head of new object, and reset the identification information of this object head piece place Page; Apply for the subject space then: if persistent object, begin, search and distribute the free space that is fit to size as subject from first free block of heap subject usage space one end; If transient object then distributes subject from ram space.
Deleted the bit position 0 of flag information among the pairing page of object head piece that then directly this object is used as garbage object; Simultaneously the space of subject is discharged, if persistent object, the space that discharges is joined unified management in the free block of heap, for reusing.
Last 3 bytes of the header of each object are an address pointer, and content is physical address or the ram space address of this contents of object in the heap space.The expression mode of object reference is: the Page in heap space numbering and the block number of object head in this Page,, wherein Page is encoded to: this Page start address/(divided by) size of each Page; Be a piece with per 8 bytes among the Page, block number is then since 1, and order increases progressively.For instance, each Page size is 128 bytes in the storer, then this object reference (2 bytes; Be 16bit) the expression mode be: 12bit representes page numbering; 4bit representes block number among the page, then can addressing: 128 * 2^12=2^19, promptly can represent the space of 512K; Analogize equally; Page size in the storer is 64 bytes, 256 bytes or 512 bytes etc.; 3bit, 5bit or the block number of 6bit indicated object in Page be can use respectively, and 13bit, 11bit or 10bit sign Page numbering used, all equally can addressing 512K space.
The mode of JAVA card object anchored object head is: the size of block number * each the object head piece of the Page numbering * Page size+object of storer in this Page.Like this, therefore the object leading address need, not only not need extra index table stores object leading address in index table stores, during the anchored object header, does not need repeatedly to locate, read concordance list yet; And the anchored object body then after contraposition object head, through the indicator linking of last 3 bytes of object head, is located, and manys one-time positioning than the object head, but still faster than the locator meams of secondary table.
JAVA card heap space Object Management group method provided by the present invention will speed up the locating speed of object reference in heap space; Save heap space, improve the space service efficiency.
Description of drawings
The structural drawing (object head from heap low address allocation space, subject from heap high address allocation space) of Fig. 1 persistence object in heap
The structural drawing 2 (object head from heap high address allocation space, subject from heap low address allocation space) of Fig. 2 persistence object in heap
The structural drawing of Fig. 3 transient object in heap/RAM
Embodiment
The object head of JAVA card object separates in heap with subject; The object head of any kind all fixedly takies 8 byte lengths, and subject then takies the different storage spaces of storing up according to the particular content of object; The data that the content of subject is used for the JAVA card, for example, wallet balances, perhaps a record certainly, also comprises the territory of object; Because the field of using is inequality, the data of application are just different, so the content of object is also different.
Last 3 bytes of the header of each object are an address pointer, and content is physical address or the ram space address of this contents of object in the heap space.
For the unification of object header, with persistence class array object and simple definition of object class place bag sign and type offset information, be put in the subject, take preceding 3 bytes of subject.
The object head is distributed in an end in heap space, and the subject then other end in the heap space is distributed or distributed at ram space.For instance, distribute object head space, distribute persistence subject (reaching other data of JAVA card) space from the past high address of low address from the past low address of the high address of heap; Perhaps, otherwise, distribute persistence subject space from low address toward high address, distribute object head space from the past low address of the high address of heap.
The header of object takies compact, adjacent physical space all the time, when low address does not have adjacent free block, should carry out the compact operation of heap space.
The object header is 8 bytes, because all types object all is an equal length, so the object head is that unit carries out the storage space application with Page; The Page space of application is an object head piece according to per 8 bytes, carries out independent space management again; Each Page need reserve 8 initial bytes, as Page management information, and the situation whether purposes of this 8 byte is used for each object head among this Page of sign.
Be an object head piece with per 8 bytes among the Page, a bit position in the flag byte of all corresponding Page management information of each piece, bit position ' 1 ' shows that this block space is assigned with; Bit shows that for putting ' 0 ' this block space is for idle; Because have 8 bytes to be used as flag byte in the Page management information, each byte has 8 bit, so can identify 8 * 8=64 object head piece altogether.
Allocate some object head spaces earlier in advance, and carry out initialization; When has used in the object head space of reserving, be that unit applies for free space again with a Page of storer, but, need to guarantee the continuity in object head space; The mode of headspace can reduce the process that apply in object head space, accelerates Object Creation; The size of headspace can possibly be created how much confirming of object according to the existing application of JAVA card.
The establishment of object is divided into the application in object head space, two steps of application in subject space: 1, the establishment of object head: when new object is created; At first begin from heap object head usage space; The identification byte of each Page head of sequential search determines whether the piece that is not used among this Page, if the future use block of having found; Then this piece is distributed to the head of new object, and the pairing Page identification information of this piece is set is ' 1 '; If all use in the object head space of reserving, be that unit applies for free space again with a Page of storer, and distribute an object head piece to the object head; 2: the establishment of subject: if the persistence object begins allocation of free space from first free block of piling the subject usage space; If transient object then distributes ram space; The persistence object is meant card under power-down conditions, and its content can be by the object of intact preservation, and the subject of the type object need be kept in the nonvolatile storage, for example EEPROM; Transient object, just Clear_On_Reset object and Clear_On_Deselect object are when the card power down, the object that its content is lost, the subject of the type object need be kept in the volatile storage district, for example RAM.
After the object deletion, during the recycle object space: directly with among the Page of object head place, the bit position 0 of the pairing flag information of object head piece that this object uses; If the deletion object is the persistence object, then the space with subject discharges, and joins in the free block of heap; Free block in the heap is that all pile the not set of usage space, and all free blocks of heap manager when object perhaps wraps code application space, are the space of its request for allocation; And when object was deleted, object taken up room to join in the free block set, for reusing.
The expression mode of object reference is: the Page numbering of the object reference=storer of 2 bytes | the block number of object in this Page, and the Page numbering takies high N bit, and block number takies low M bit, and N adds M and is 16bit, just 2 bytes altogether.Wherein Page is encoded to: the size of this Page start address/each Page; Be a piece with per 8 bytes among the Page, block number is then since 1, and order increases progressively.For instance, each Page size is 128 bytes in the storer, then this object reference (2 bytes; Be 16bit) the expression mode be: 12bit representes page numbering; 4bit representes block number among the page, then can addressing: 128 * 2^12=2^19, promptly can represent the space of 512K; Analogize equally; Page size in the storer is 64 bytes, 256 bytes or 512 bytes etc.; The block numbers of indicated object in Page such as 3bit, 5bit or 6bit be can use respectively, and 13bit, 11bit or 10bit sign Page numbering used, all equally can addressing 512K space.
Object can directly be positioned through resolving above quoting,, can directly be positioned the size of block number * each the object head piece of the Page numbering * Page size+object of object leading address=storer in this Page.Like this, therefore the object leading address need, not only not need extra index table stores object leading address in index table stores, during the anchored object header, does not need repeatedly to locate, read concordance list yet; And the anchored object body then after contraposition object head, through the indicator linking of last 3 bytes of object head, is located, and manys one-time positioning than the object head, but still faster than the locator meams of secondary table.
In a word, the JAVA bytecode is resolved when carrying out, can be according to object reference, and through one parsing, directly the header of anchored object comprises the type of object, the bag sign at object place, the information such as number in object territory; Can have access to the content of object through twice parsing.
Object head place Page piece
8 bytes that each page begins are block mark bytes.
The form of table 1 object head place Page piece
| The PAGE block format | Length (Bytes) |
| Effectively whether the object head sign | 8 |
| The 1st object head piece | 8 |
| The 2nd object head piece | 8 |
| ...... | ...... |
[0038]The storage mode of object head
● the object type sign
1 byte, the sign object type, it defines like following table (bit that does not make an explanation is to keep):
The defined declaration of table 2 object head type sign
| Bit7 | Bit6 | Bit5 | Bit4 | Bit3 | Bit2 | Bit1 | Bit0 | Type declaration |
| ? | ? | ? | ? | ? | ? | 0 | 0 | Persistence |
| ? | ? | ? | ? | ? | ? | 0 | 1 | Be indicated as the Clear_On_Reset transient state |
| ? | ? | ? | ? | ? | ? | 1 | 1 | The Clear_On_Deselect transient state |
| 0 | 0 | 1 | ? | ? | ? | ? | ? | Common |
| 0 | 1 | 1 | ? | ? | ? | ? | ? | The boolean array |
| 1 | 0 | 0 | ? | ? | ? | ? | ? | The byte array |
| 1 | 0 | 1 | ? | ? | ? | ? | ? | The short array |
| 1 | 1 | 0 | ? | ? | ? | ? | ? | The int array |
| 1 | 1 | 1 | ? | ? | ? | ? | ? | The reference array |
Object comprises various types of transient objects and persistence object; The persistence object of general type for example; The Clear_On_Reset transient object of byte array type.
● common object head
The common object header of table 3 formal definition
| Field | Length |
| The object type sign | ?1byte |
| The bag sign | application identities | ?2byte |
| The space that subject is shared | ?2byte |
| The specific address of subject | ?3byte |
The object head is made up of 8 bytes: the initial physical address of subject of the sign of the Object Creation environment (context) of the object type of 1 byte, 2 bytes, the shared space of subject of 2 bytes and 3 bytes.
● primitive array object head (comprising boolean, byte, short and int array)
Table 4 fundamental type array object header formal definition
| Field | Length |
| The object type sign | ?1byte |
| The bag sign | application identities | ?2byte |
| The array element number | ?2byte |
| The reference position of array element (specific address) | ?3byte |
The object head is made up of 8 bytes: the array element number that the sign of the Object Creation environment (context) of the object type of 1 byte, 2 bytes, the subject of 2 bytes comprise and the initial physical address of subject of 3 bytes.
● reference type array head (reference array)
Table 5 reference type array object header formal definition
| Field | Length |
| The object type sign | ?1byte |
| The bag sign | application identities | ?2byte |
| The array element number | ?2byte |
| The reference position of array element (specific address) | ?3byte |
The object head is made up of 8 bytes: the array element number that the sign of the Object Creation environment (context) of the object type of 1 byte, 2 bytes, the subject of 2 bytes comprise and the initial physical address of subject of 3 bytes.
● transient state primitive object array head
Table 6 transient state fundamental type array object header formal definition
| Field | Length |
| The object type sign | ?1byte |
| The bag sign | application identities | ?2byte |
| The array element number | ?2byte |
| The reference position of array element (ram space skew) | ?3byte |
The object head is made up of 8 bytes: the sign of the Object Creation environment (context) of the object type of 1 byte, 2 bytes, array element number that the subject of 2 bytes comprises and the subject initial logical address (skew in RAM) of 3 bytes.
● transient state object object array head
Table 7 transient state fundamental type array object header formal definition
| Field | Length |
| The object type sign | ?1byte |
| The bag sign | application identities | ?2byte |
| The array element number | ?2byte |
| The reference position of array element (ram space address) | ?3byte |
The object head is made up of 8 bytes: the sign of the Object Creation environment (context) of the object type of 1 byte, 2 bytes, array element number that the subject of 2 bytes comprises and the subject initial logical address (address in RAM) of 3 bytes.
The storage mode of subject
● common subject
The information format definition of the common subject of table 8
| Field | Length |
| The category information offset address of definition of object class | 2byte |
| The bag ID at definition of object class place | 1byte |
| The subject content | ...... |
Preceding 3 bytes of subject are the bag and the class component skew at object definition class place, when these two fields are mainly used in the bytecode execution, and visit when empty method call etc. are resolved.
The content of subject is the territory of object, comprising: data and quoting some object.
● primitive array object body (comprising boolean, byte, short and int array)
The information format definition of table 9 fundamental type array object body
| Field | Length |
| The 0th element of array | 1 byte (boolean, byte), 2 bytes (short), 4 bytes (int) |
| ?.... | ? |
| ? | ? |
The element of the data object of the content of fundamental type array object body.
● reference type array object body (reference array)
The information format definition of table 10 reference type array object body
| Field | Length |
| The category information offset address of definition of object class | 2byte |
| The bag ID at definition of object class place | 1byte |
| The 0th element of array | 2byte |
| .... | ? |
| ? | ? |
The content of reference type array object body: preceding 3 bytes of subject are the bag and the class component skew at object definition class place, when these two fields are mainly used in the bytecode execution, and visit when empty method call etc. are resolved; The back is the element of array object.
● transient state primitive object array body
The information format definition of table 11 transient state fundamental type array object body
| Field | Length |
| The 0th element of array | 1 byte (boolean, byte), 2 bytes (short), 4 bytes (int) |
| ?... | ... |
The content of transient state fundamental type array object body is the element of array object.(depositing in volatile memory, for example among the RAM).
● transient state object object array body
The information format definition of table 12 transient object number of types group objects body
| Means | Length |
| The 0th element of array | 2 bytes |
| ?.... | ?..... |
The content of transient object number of types group objects body is the element of array object.(depositing in volatile memory, for example among the RAM).
Claims (10)
1.JAVA card Object Management group method; It is characterized in that: the object head of JAVA card object separates storage with subject, and JAVA card object is the storage space of unit application object head with Page and carries out Page numbering, is a piece with per 8 bytes among the Page; Block number is then since 1, and order increases progressively; The object head takies 8 bytes, and last 3 bytes are physical address pointer or the ram space address pointer of subject in the heap space, and subject then takies different heap space or ram space according to the particular content of JAVA card object.
2. the method for claim 1 is characterized in that 8 initial bytes of each Page as Page management information, identifies the situation whether the object head storage space of JAVA card object among this Page is used.
3. method as claimed in claim 2 is characterized in that among the Page per 8 bytes as an object head storage space, a bit position in all corresponding Page management information of each object head, and bit position 1 shows that this object head storage space is assigned with; Bit position 0 shows that this object head storage space is for idle.
4. the method for claim 1 is characterized in that the object head is distributed in the heap space, and the subject then other end in the heap space is distributed or distributed at ram space.
5. the method for claim 1; It is characterized in that allocating in advance the heap space; When pre-assigned heap space has been used, is that unit applies for free space again with the Page in heap space, and guarantees the continuity of object head storage space.
6. method as claimed in claim 5, it is characterized in that the JAVA card object that creates according to the JAVA calorie requirement in pre-assigned heap space what confirm.
7. like claim 2 or 3 described methods; When it is characterized in that creating the object head; Sequential search Page management information confirms whether to have among this Page the object head storage space that is not used, if having; Then with the object head of this object head memory allocation to JAVA card object, and the pairing Page identification information of this object head storage space is set is ' 1 '; If no, be unit application free space with the Page in heap space, and distribute the object head of an object head storage space to JAVA card object.
8. like claim 2 or 3 described methods, it is characterized in that after JAVA card object is deleted, when reclaiming the object head space of JAVA card object, directly that the object head is corresponding bit position 0.
9. method according to claim 1; It is characterized in that: the expression mode that the object head is quoted is: the Page numbering and the block number of object head in this Page in heap space, wherein Page is numbered: this Page start address is divided by the size of each Page.
10. according to claim 1 or 9 described methods, it is characterized in that: the mode of JAVA card object anchored object head is: the size that the block number of the Page numbering * Page size+object head in heap space in this Page * each object head is shared.
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| CN110765159A (en) * | 2019-11-01 | 2020-02-07 | 上海达梦数据库有限公司 | Object analysis method, device, storage medium and equipment |
| CN110765159B (en) * | 2019-11-01 | 2022-08-12 | 上海达梦数据库有限公司 | Object analysis method, device, storage medium and equipment |
| CN112612753A (en) * | 2020-12-29 | 2021-04-06 | 深圳杰睿联科技有限公司 | System and method for dynamically managing Java Card storage space |
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