CN101739404B - Bytecode-optimized database and establishing method thereof and bytecode optimizing mehtod - Google Patents
Bytecode-optimized database and establishing method thereof and bytecode optimizing mehtod Download PDFInfo
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- CN101739404B CN101739404B CN200810174452A CN200810174452A CN101739404B CN 101739404 B CN101739404 B CN 101739404B CN 200810174452 A CN200810174452 A CN 200810174452A CN 200810174452 A CN200810174452 A CN 200810174452A CN 101739404 B CN101739404 B CN 101739404B
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Abstract
The invention relates to a bytecode-optimized database and an establishing method thereof and a bytecode optimizing method. The method for establishing a JAVA card bytecode-optimized database comprises the following steps of: scanning a bytecode sequence which can be arranged on a JAVA card to acquire given bytecode segments in the scanned bytecode sequence, wherein the given bytecode segments comprise one or more bytecode segments repeatedly used to the preset times; constructing static functions to correspond to the acquired given bytecode segments respectively; and storing an incidence relation between the given bytecode segments and the corresponding static functions so as to establish the JAVA card bytecode-optimized database. The bytecode optimizing method can obviously optimize the repeated bytecodes, reduces storage consumption, improves efficiency, and realizes compatibility.
Description
Technical field
The present invention relates to field of intelligent cards, relate in particular to the optimization method of bytecode-optimized database and method for building up thereof and JAVA card bytecode.
Background technology
The JAVA card is JAVA virtual machine technique and the product that the traditional intelligence card technique combines, and is a kind of smart card that can move the JAVA program.
The JAVA program implementation process that can operate on the smart card is following.At first, write the JAVA source code (.java program file) of this JAVA program by the developer, source code generates the class file of being made up of the bytecode that meets the JAVA virtual machine specification (.class) through compiler compiling back.When this JAVA program was moved on smart card, class loaders was packed into from the bytecode of class file, behind the verifier safety verification, read bytecode by the JAVA virtual machine, converted the local code of JAVA card into, in the CPU of smart card, moved.
Usually; There are a large amount of byte code sequences that repeat in the class file of forming by bytecode; And also there are a large amount of byte code sequences that repeat in different being installed in the program on the JAVA card, and this can be caused the lot of consumption of storage space undoubtedly, also certainly will reduce the execution efficient of bytecode.
Carry out efficient for the consumption and the raising bytecode that reduce storage space, proposed the byte code sequence that a kind of optimisation technique is optimized a large amount of repetitions at present.This technology considers and remains with some undefined bytecodes in the JAVA virtual machine specification, so, utilize these undefined bytecodes to replace a large amount of byte code sequences that repeat as macro definition.For example; The instruction sload 4 of certain application program often is used on the JAVA card, and the value of the 4th parameter is read in this instruction expression from storehouse, be 0x16 and 0x04 by the byte code sequence after compiling; Two bytes will be taken, and when operation, two bytecodes need be scanned.According to the method described above; Can replace 0x16 and 0x04 as macro definition with undefined bytecode 0xEF in the JAVA virtual machine specification; Like this; The instruction of originally representing with two bytecodes only need just can be represented with a bytecode now, when carrying out, also only needs bytecode of scanning, so can save storage space and improve the execution efficient of bytecode.
Though existing method can reduce storage consumption and raise the efficiency, still there are many problems in this method.At first, owing to used the undefined byte sign indicating number that keeps,, will cause whole JAVA card system incompatible so if therefore use the bytecode of these reservations during the upgrading of JAVA virtual machine specification.Secondly, undefined bytecode is very limited, and this makes existing method can only on very limited degree, reduce storage consumption and raise the efficiency.At last, the bytecode according to after the above-mentioned optimization method optimization can only be loaded on the specific JAVA card, is carried out by specific JAVA virtual machine, otherwise will produce ambiguity, and causes program normally to carry out.
Summary of the invention
The object of the present invention is to provide the optimization method of bytecode-optimized database and method for building up thereof and JAVA card bytecode, utilize the present invention can significantly optimize the bytecode of repetition, compatibility is raised the efficiency and realized to the reduction storage consumption.
For realizing the foregoing invention purpose, the present invention proposes a kind of method that is used to set up JAVA card bytecode-optimized database, comprises step:
Scanning can be installed in the byte code sequence of the application program on the said JAVA card, and with specific bytecode section in the byte code sequence that obtains to be scanned, wherein, specific bytecode section comprises that one or more repeated uses reach the bytecode section of pre-determined number;
The structure static function is come the corresponding respectively specific bytecode section that is obtained; With
Store the incidence relation of specific bytecode section and corresponding static function, to set up JAVA card bytecode-optimized database.
The present invention also provides a kind of JAVA card bytecode-optimized database, comprising:
Scan module; Be used to scan the byte code sequence that can be installed in the application program on the said JAVA card; With specific bytecode section in the byte code sequence that obtains to be scanned, wherein, specific bytecode section comprises that one or more repeated uses reach the bytecode section of pre-determined number;
The static function constructing module, the specific corresponding static function of bytecode section that is used to construct Yu is obtained; With
Memory module is used to store the incidence relation of specific bytecode section and corresponding static function.
The present invention also provides a kind of optimization method of JAVA card bytecode, comprises step:
Bytecode-optimized database is arranged to the module of quoting of application program; Wherein, This bytecode-optimized database comprises specific bytecode section and corresponding static function thereof, and specific bytecode section comprises that one or more repeated uses reach the bytecode section of pre-determined number;
Static function included in the said bytecode-optimized database is placed the constant pool of said application program;
The specific bytecode section that said application program is included replaces with corresponding static function; With
Upgrade exception process range and reference position in the byte code sequence of said application program.
Description of drawings
Other characteristics of the present invention, purpose and benefit will become more obvious through the detailed description below in conjunction with accompanying drawing.Wherein:
Fig. 1 is the method flow diagram that is used to set up JAVA card bytecode-optimized database;
Fig. 2 is the exemplary relation tabulation that is used to store specific bytecode section and corresponding static function thereof;
Fig. 3 is the process flow diagram of the optimization method of JAVA card bytecode.
Embodiment
Below, will combine accompanying drawing to describe each embodiment of the present invention in detail.
Fig. 1 is the method flow diagram that is used to set up JAVA card bytecode-optimized database.This method was carried out before the JAVA card dispatches from the factory, and the JAVA card bytecode-optimized database that utilizes this method to set up places on the JAVA card.
Before this method of execution; At first collect the application program that can on the JAVA card, install, comprise JAVA card system self application program, JAVA application program that current main-stream is used and the JAVA application program in the applied field of JAVA card etc. in the intrinsic routine library.The source code of these application programs generates byte code sequence through compiling.
As shown in Figure 1; Application program to collecting scans through the byte code sequence that compiling is generated; To obtain bytecode section specific in these byte code sequences, wherein, specific bytecode section comprises reuses the bytecode section (step S100) that reaches pre-determined number.
Each specific bytecode section is all constructed a corresponding with it static function (step S110).
Store the incidence relation of each specific bytecode section and corresponding static function, to set up JAVA card bytecode-optimized database (step S120).
A simple JAVA card bytecode-optimized database is as shown in Figure 2; It is used to store each specific bytecode section and corresponding static function thereof; To represent the incidence relation between the two, be convenient to when follow-up use, replace corresponding specific bytecode section with static function.As shown in Figure 2, store two specific bytecode sections and corresponding static function thereof in the relation list, specific bytecode section A is corresponding to static function a, and specific bytecode section B is corresponding to static function b.So, when set up applications, can bytecode section A all in the program file be replaced to static function a, all bytecode section B are replaced to static function b.Usually, the specific shared storage space of bytecode section is far longer than the shared storage space of static function, like this, and through replacement; Application program just can not take so big space, and when program run, only scans the code of much less yet; So, can reduce storage consumption, raise the efficiency.
Below, describe JAVA card referring to Fig. 3 and realize bytecode-optimized process with JAVA card bytecode-optimized database of setting up according to method shown in Figure 1.Fig. 3 shows the process flow diagram of the optimization method of JAVA card bytecode.This optimization method is being carried out when the JAVA card is installed new application program; For example; New application program Y will be installed on the JAVA card; There is specific bytecode section in the installation file of this application program in the byte code sequence that compiling generated, there is corresponding static function in these specific bytecode sections in JAVA card bytecode-optimized database.
As shown in Figure 3, at first, with placing the bytecode-optimized database on this JAVA card to be arranged to the module of quoting of application program Y, so that in the process of set up applications Y, can use this bytecode-optimized database (step S300).
Then, static function included in the bytecode-optimized database is placed the constant pool (step S310) of application program Y;
In the process that this application program Y installs, included specific bytecode section all replaces with static function (step S320) corresponding in the bytecode-optimized database in the file with installing;
Consider the exception process range and the reference position of JAVA LISP program LISP; Because specific bytecode section has been replaced to corresponding static function; So exception process range and reference position in the installation file will change to some extent; So, upgrade exception process range and reference position (the step S330) of whole byte code sequence.
Further, specific bytecode section can comprise that also those take the more bytecode section of storage resources.Like this, every application program of this bytecode section that comprises can replace this specific bytecode section with static function when mounted, thereby reduces storage consumption greatly.
In addition; If on known specific JAVA card, bytecode-optimized database is set; So can also be in advance static function be realized with the local code of this specific JAVA card, like this, be installed in application program on this JAVA card when operation; Directly carry out local code, this will significantly improve the efficient of whole virtual machine and running environment.
It will be appreciated by those skilled in the art that top each embodiment disclosed method can utilize software, hardware or way of hardware and software combination to realize.
Those skilled in the art are to be understood that; Under the enlightenment of the above embodiment of the present invention; Can obtain the various distortion of the embodiment of the invention, and under the situation that does not depart from the spirit or scope of the present invention, defined General Principle can be applied among other embodiment also among this paper.Therefore the present invention is not limited to the embodiment shown in this paper, and requirement and principle and novel feature the widest corresponding to scope disclosed herein.
Claims (8)
1. method that is used to set up JAVA card bytecode-optimized database comprises step:
Scanning can be installed in the byte code sequence of the application program on the said JAVA card, and with specific bytecode section in the byte code sequence that obtains to be scanned, wherein, specific bytecode section is to take the bytecode section that resource reaches predeterminated level;
The structure static function is come the corresponding respectively specific bytecode section that is obtained; With
Store the incidence relation of specific bytecode section and corresponding static function, to set up JAVA card bytecode-optimized database.
2. the method that is used to set up JAVA card bytecode-optimized database as claimed in claim 1, wherein, the byte code sequence that can be installed in the application program on the said JAVA card comprises:
The byte code sequence of intrinsic routine library on the said JAVA card.
3. like each described method that is used to set up JAVA card bytecode-optimized database among the claim 1-2, also comprise:
Said static function is compiled into the local code of said JAVA card, and stores the incidence relation between said static function and the said local code.
4. device that is used to set up JAVA card bytecode-optimized database comprises:
Scan module is used to scan the byte code sequence that can be installed in the application program on the said JAVA card, and with specific bytecode section in the byte code sequence that obtains to be scanned, wherein, specific bytecode section is to take the bytecode section that resource reaches predeterminated level;
The static function constructing module, the specific corresponding static function of bytecode section that is used to construct Yu is obtained; With
Memory module is used to store the incidence relation of specific bytecode section and corresponding static function.
5. the device that is used to set up JAVA card bytecode-optimized database as claimed in claim 4, wherein, said scan module scans the bytecode of intrinsic routine library on the said JAVA card.
6. like claim 4 or the 5 described devices that are used to set up JAVA card bytecode-optimized database, also comprise:
The local code generation module is used for said static function is compiled into the local code of said JAVA card; And
Said memory module also is used to store the incidence relation between said static function and the said local code.
7. the optimization method of a JAVA card bytecode comprises step:
Bytecode-optimized database is arranged to the module of quoting of application program, and wherein, this bytecode-optimized database comprises specific bytecode section and corresponding static function thereof, and specific bytecode section is to take the bytecode section that resource reaches predeterminated level;
Static function included in the said bytecode-optimized database is placed the constant pool of said application program;
The specific bytecode section that said application program is included replaces with corresponding static function; With
Upgrade exception process range and reference position in the byte code sequence of said application program.
8. optimization method as claimed in claim 7, wherein, said bytecode-optimized database also comprises and the corresponding local code of said static function; And
When said application program is moved, directly carry out said local code.
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| CN200810174452A CN101739404B (en) | 2008-11-05 | 2008-11-05 | Bytecode-optimized database and establishing method thereof and bytecode optimizing mehtod |
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| CN200810174452A CN101739404B (en) | 2008-11-05 | 2008-11-05 | Bytecode-optimized database and establishing method thereof and bytecode optimizing mehtod |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104063208B (en) * | 2013-03-21 | 2017-11-17 | 北京百度网讯科技有限公司 | Optimization method, system and the server of code file |
| CN105653351B (en) * | 2015-12-30 | 2019-08-06 | 北京博思汇众科技股份有限公司 | The optimization method and system of java card virtual machine |
| CN106227576A (en) * | 2016-08-18 | 2016-12-14 | 北京智芯微电子科技有限公司 | The function realizing method of a kind of Java card application and device |
| CN108153530B (en) * | 2017-12-26 | 2020-06-16 | 网易（杭州）网络有限公司 | Byte code optimization method and device, storage medium, processor and terminal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1292114A (en) * | 1998-11-06 | 2001-04-18 | 布尔Cp8公司 | Data compaction method for intermediate object code program executable in onboard system |
| CN1493983A (en) * | 2003-09-05 | 2004-05-05 | 浙江大学 | Parallel compiling apparatus based on J2EE construction unit |
| CN1687900A (en) * | 2005-06-16 | 2005-10-26 | 北京航空航天大学 | Method for controlling smart card running environment |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1292114A (en) * | 1998-11-06 | 2001-04-18 | 布尔Cp8公司 | Data compaction method for intermediate object code program executable in onboard system |
| CN1493983A (en) * | 2003-09-05 | 2004-05-05 | 浙江大学 | Parallel compiling apparatus based on J2EE construction unit |
| CN1687900A (en) * | 2005-06-16 | 2005-10-26 | 北京航空航天大学 | Method for controlling smart card running environment |
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