CN101295239A - Instruction execution method of Java card virtual machine - Google Patents
Instruction execution method of Java card virtual machine Download PDFInfo
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- CN101295239A CN101295239A CNA2007100278568A CN200710027856A CN101295239A CN 101295239 A CN101295239 A CN 101295239A CN A2007100278568 A CNA2007100278568 A CN A2007100278568A CN 200710027856 A CN200710027856 A CN 200710027856A CN 101295239 A CN101295239 A CN 101295239A
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- card virtual
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Abstract
The invention relates to an instruction execution method for a Java card virtual machine, comprising the steps as follows: step one, a processor executes the current instruction which is required to be executed in an instruction set; meanwhile, an accelerator is informed by the processor to analyse the current instruction; step 2, the accelerator analyses the property of the current instruction and obtains the byte code address of the next instruction; steps 3, the processor is informed of the byte code address of the next instruction and jumps to the next instruction after completing the execution of the current instruction. The instruction execution method for the Java virtual machine provided by the invention carries out the analysis of the current instruction by the accelerator and obtains the byte code address of the next instruction, leads the processor to directly jump to the next instruction required to be executed immediately after completing the execution of the current instruction and has the advantages of high efficiency and high stability.
Description
Technical field
The present invention relates to field of intelligent cards, relate in particular to a kind of instruction executing method of Java card virtual machine.
Background technology
Smart card has been widely used in the various products such as mobile phone, music player, Digital Television, and smart card can be realized multiple functions such as the storage, information processing of identification, data.Java card is an emerging smart card, is the multi-application platform of an opening, can realize downloading various application programs by Java card.
Because Java card itself has Java language, thus its by the Java card virtual machine to the instruction execution that makes an explanation.The Java card virtual machine is not a kind of physical arrangement, but a kind of explanation is used for the independently operating environment of the bytecode of hardware platform, and wherein the explanation for bytecode is to be achieved by the raw machine language instruction of selecting to be stored among storer or the CPU.For Java card, its instruction process speed in the course of the work will directly have influence on the travelling speed of Java card.
Disclosed a kind of instruction executing method of existing Java card virtual machine among Fig. 1, storage is by four instructions P1 in the order register 11 shown in Fig. 1, P2, P3, the instruction set that P4 forms, CPU12 explains (promptly according to P1 successively by the method that order is carried out, P2, P3, the order of P4), carry out every instruction, yet, the executive mode of this instruction is lost time very much, for example, if after executing instruction P1, CPU12 need carry out next bar instruction P4, CPU12 still needs interpretive order P2 so, P3 is until P4, promptly, adopt the mode of traversal that instruction is made an explanation, until the instruction of finding needs to carry out, the travelling speed that influences Java card that this method can be very big, efficient is very low.On the other hand, if unusual or mistake have appearred in a certain instruction in the process of implementation, CPU12 can't continue to carry out next bar instruction so, will cause deadlock, causes the stability of Java card not high.
At the above-mentioned defective of prior art, the present invention is exactly the instruction executing method that the Java card virtual machine of a kind of high-level efficiency, high stability will be provided.
Summary of the invention
The instruction executing method that the purpose of this invention is to provide the Java card virtual machine of a kind of high-level efficiency, high stability.
For achieving the above object, the instruction executing method of Java card virtual machine provided by the invention may further comprise the steps:
Step 1, the processor execution command is concentrated the present instruction that need be performed, and by processor notice accelerator present instruction is resolved simultaneously;
Step 2, accelerator is resolved the attribute of present instruction, obtains the bytecode address of next instruction;
Step 3, with the address code address notification processor of next instruction, and after executing present instruction by processor redirect next instruction so far.
The instruction executing method of Java card virtual machine provided by the present invention is resolved present instruction by accelerator, obtain the bytecode address of next instruction, make processor after executing present instruction, can directly jump to the instruction that next need be carried out immediately, avoid the instruction sequences parsing, carried out the time waste that is brought, had high efficiency advantage; When the present instruction appearance was unusual or wrong, processor can be pointed out unusual and continue and be carried out next instruction, has avoided the deadlock phenomenon, makes the stability of Java card be improved simultaneously.
In order to make the instruction executing method of Java card virtual machine of the present invention optimize more, can also be after executing described step 1, carry out a determining step of judging whether all instructions are finished, all be finished if judge all instructions, then termination routine; If instruction is not finished, then carry out described step 2.
Detailed content will be done clearer introduction in specific embodiment.
Description of drawings
Fig. 1 is the instruction executing method synoptic diagram of existing Java card virtual machine;
Fig. 2 is the instruction executing method synoptic diagram of Java card virtual machine of the present invention;
Fig. 3 is the process flow diagram of first embodiment of the instruction executing method of Java card virtual machine of the present invention;
Fig. 4 is the process flow diagram of another embodiment of the instruction executing method of Java card virtual machine of the present invention;
Be described in further detail below in conjunction with embodiment and accompanying drawing thereof.
Embodiment
Shown in Fig. 2, disclosed the instruction executing method of Java card virtual machine of the present invention among Fig. 2, the Java card virtual machine shown in Fig. 2 comprises the order register 21 of store sets of instructions, the CPU22 of execution command and the accelerator 23 of interpretive order.The instruction set that storage is made up of four instructions P1, P2, P3, P4 in the order register 21, CPU22 is when carrying out a certain instruction, the present instruction that needs are performed is sent in the accelerator 23 and is resolved, after accelerator 23 parses the attribute of present instruction, can obtain the bytecode address of next instruction, and with this address notice CPU22, after CPU22 executes present instruction, to directly carry out next instruction, rather than the instruction that order is resolved, execution command is concentrated.
Fig. 3 shows the process flow diagram of preferred embodiment of the instruction executing method of Java card virtual machine of the present invention, and it comprises following step:
After CPU22 directly jumps to next instruction, re-execute step 1, carry out this instruction.If next instruction is END instruction, promptly all instructions are finished, and system will finish the execution of instruction this time so.Certainly, also can on the basis of above-mentioned preferred embodiment, increase the step whether determining program finishes, as shown in Figure 4, between step 31 and step 32, increase a determining step 34, judge whether all instructions are finished, if institute all is finished in steps, then interpretive routine; If be not finished, then continue execution in step 32.
Obviously, the instruction executing method of Java card virtual machine of the present invention is resolved by 23 pairs of present instructions of accelerator, obtain the bytecode address of next instruction, make CPU22 after executing present instruction, can directly jump to the instruction that next need be carried out immediately, avoid the instruction sequences parsing, carried out the time waste that is brought, had high efficiency advantage; Occur when unusual or wrong in present instruction simultaneously, CPU22 can point out unusual and continue and carry out next instruction, has avoided the deadlock phenomenon, makes the stability of Java card improve.
Certainly the present invention is not limited to the foregoing description, and those skilled in the art can do the variation of some equivalences according to foregoing description, and for example, instruction set is not limited to be stored in the order register 21, can also be the command memory of other form; CPU22 also can take the processor of MCU forms such as (microcontrollers).Suchlike equivalent transformation all should be included in the claim restricted portion.
Claims (5)
1, the instruction executing method of Java card virtual machine, described Java card virtual machine comprises the command memory of store sets of instructions, the CPU of execution command and the accelerator of resolving instruction, the instruction executing method of described Java card virtual machine may further comprise the steps:
Step 1, the processor execution command is concentrated the present instruction that need be performed, and by processor notice accelerator present instruction is resolved simultaneously;
Step 2, accelerator is resolved the attribute of present instruction, obtains the bytecode address of next instruction;
Step 3, with the address code address notification processor of next instruction, and after executing present instruction by processor redirect next instruction so far.
2, the instruction executing method of Java card virtual machine according to claim 1 is characterized in that:
After executing described step 1, carry out a determining step of judging whether all instructions are finished, all be finished if judge all instructions, then termination routine; If instruction is not finished, then carry out described step 2.
3, the instruction executing method of Java card virtual machine according to claim 1 is characterized in that:
Described command memory is an order register.
4, the instruction executing method of Java card virtual machine according to claim 1 is characterized in that:
Described processor is CPU.
5, the instruction executing method of Java card virtual machine according to claim 1 is characterized in that:
Described processor is MCU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100278568A CN101295239A (en) | 2007-04-26 | 2007-04-26 | Instruction execution method of Java card virtual machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007100278568A CN101295239A (en) | 2007-04-26 | 2007-04-26 | Instruction execution method of Java card virtual machine |
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| CN101295239A true CN101295239A (en) | 2008-10-29 |
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| CNA2007100278568A Pending CN101295239A (en) | 2007-04-26 | 2007-04-26 | Instruction execution method of Java card virtual machine |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102903001A (en) * | 2012-09-29 | 2013-01-30 | 上海复旦微电子集团股份有限公司 | Instruction processing method and intelligent card |
| CN107179935A (en) * | 2016-03-11 | 2017-09-19 | 华为技术有限公司 | A kind of instruction executing method and virtual machine |
| CN110704108A (en) * | 2019-08-30 | 2020-01-17 | 阿里巴巴集团控股有限公司 | Method and device for interpreting and executing byte code instruction stream |
| US10802854B2 (en) | 2019-08-30 | 2020-10-13 | Alibaba Group Holding Limited | Method and apparatus for interpreting bytecode instruction stream |
| CN112256331A (en) * | 2020-12-22 | 2021-01-22 | 鹏城实验室 | Virtual machine instruction analysis acceleration method and device and computer storage medium |
-
2007
- 2007-04-26 CN CNA2007100278568A patent/CN101295239A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102903001A (en) * | 2012-09-29 | 2013-01-30 | 上海复旦微电子集团股份有限公司 | Instruction processing method and intelligent card |
| CN102903001B (en) * | 2012-09-29 | 2015-09-30 | 上海复旦微电子集团股份有限公司 | The disposal route of instruction and smart card |
| CN107179935A (en) * | 2016-03-11 | 2017-09-19 | 华为技术有限公司 | A kind of instruction executing method and virtual machine |
| CN107179935B (en) * | 2016-03-11 | 2021-01-29 | 华为技术有限公司 | Instruction execution method and virtual machine |
| CN110704108A (en) * | 2019-08-30 | 2020-01-17 | 阿里巴巴集团控股有限公司 | Method and device for interpreting and executing byte code instruction stream |
| US10802854B2 (en) | 2019-08-30 | 2020-10-13 | Alibaba Group Holding Limited | Method and apparatus for interpreting bytecode instruction stream |
| TWI743698B (en) * | 2019-08-30 | 2021-10-21 | 開曼群島商創新先進技術有限公司 | Method and device for interpreting execution byte code instruction stream |
| CN112256331A (en) * | 2020-12-22 | 2021-01-22 | 鹏城实验室 | Virtual machine instruction analysis acceleration method and device and computer storage medium |
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Open date: 20081029 |