Method for analysis and execution of local variable byte code of JAVA card by applying chip hardware
A technology of local variables and bytecodes, applied in the field of JAVA smart cards, can solve problems such as difficulty in meeting performance requirements, performance degradation, and low CPU frequency
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[0016] The process of analyzing and executing the local variable bytecode of the JAVA card provided by the present invention by using the chip hardware will be further described below in conjunction with the accompanying drawings and examples.
[0017] 1. Stack management
[0018] as attached figure 1 As shown, the JAVA card stack frame includes an operand stack, a local variable area, and a context information area. The operand stack is the bytecode operand stack area of the JAVA card, and the local variable area is the local variable storage area of the current method of the JAVA card. In the process of JAVA card bytecode parsing and execution, data mainly interacts in the operand stack and local variable areas. The performance of this area will greatly affect the performance of JAVA card virtual machine bytecode parsing and execution. In the present invention, the attached figure 1 The FP (stack bottom), G_FP_top (local variable stack top), and SP (operand stack top...
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