37 results about "Java card virtual machine" patented technology

The invention is a kind of 32 bits embedded micro-processor which uses the new structure; it can process the local RISC instruction and Java virtual machine instruction. It is made up of instruction taking unit, instruction cache, instruction coding circuit, instruction replicating circuit, universal register group, data calculating unit, memory unit, promoting circuit and abnormity processing unit. The injunction cache and injunction replicating circuit is useful only in executing the Java virtual machine, at the same time, the universal register group is mapped into stack cache. The inventions have two instructions repertories, they can be switches seamlessly, but the circuit area increases only no more than 20% compared with the old.

The invention provides a program debugging method and device, which relates to the field of software engineering. The problem that current debugging method is lower in debugging efficiency and maintenance convenience is solved. The method comprises the steps of: establishing a virtual thread of a Java card virtual machine; establishing a virtual character string object of the Java card virtual machine; and carrying out adaptive response of configuration information comprising the virtual character thread and the virtual character string object between the Java card virtual machine and a Java integrated debugging environment. The technical scheme provided by the invention is adaptive to synchronous debugging of Java language and C language, so that jointed debugging of virtual machine programs compiled by Java and C languages is realized.

The invention discloses an object management method based on a java card virtual machine. The object management method based on the java card virtual machine comprises that the java card virtual machine can detect an establishing object operation, and the basic information of the establishing object can be filled into a second memory space. An offset address of the to-be-established object can be obtained and stored in a blank table item of a sub object table. An index value of the to-be-established object can be calculated and used for replacing a first index value, wherein the first index value is stored. Deleting computer-aided production (CAP) image operation can be detected. A CAP image which is stored in a first memory space and corresponds to an identification (ID) of a deleting CAP image can be marked as a fragment. Types of assembly of the first memory space can be detected in sequence. When the type is the sub object table, the sub object table can be move to a high address direction. The offset address of the sub object table can be modified, wherein the sub object table is stored in a main object table. When the type is the CAP image, the CAP image can be moved to the high address direction and the CAP image address can be replaced. According to the object management method based on the java card virtual machine, a sub object and a main object can be used for managing objects so as to be easy and convenient. In addition, resources are saved.