Optimization method of stack variable-containing function

Abstract

The invention provides an optimization method of a stack variable-containing function. The method comprises the steps of: applying a section of physical memory space used as a mapping stack of a function to be optimized, and then applying a section of virtual memory space used as a shadow stack of the function to be optimized; selecting a stack variable to be lifted to an idle register from the function to be optimized; inserting an instruction for switching a function stack of the function to be optimized from a system stack to the mapping stack, an instruction for lifting the content of thestack variable to the registers and an instruction for setting a virtual storage page in the mapping stack to be in a protected mode; replacing all the instructions containing operations on the lifted stack variable to be instructions for operating corresponding registers, and replacing all the operations on the non-lifted stack variables to be operations on corresponding virtual storage addresses on the shadow stack; and inserting an instruction for removing the protected mode on the virtual storage page in the mapping stack, an instruction for storing the content of the lifted stack variable back to an internal memory from the registers, and an instruction for switching a function stack frame from the mapping stack back to the system stack.

Description

technical field [0001] The invention relates to a function optimization method, in particular to an optimization method for a function containing stack variables. Background technique [0002] The CPU (Central Processing Unit) plays a central role in a computer. With the continuous advancement of technology, processor technology is also developing. For example, according to the word length of information processed by the CPU, the CPU has experienced the development of four-bit microprocessors, eight-bit microprocessors, sixteen-bit microprocessors, thirty-two-bit microprocessors, and sixty-four-bit microprocessors. . Generally speaking, compared with old processors, new processors will introduce some new features, such as increasing the number of registers, adding new instructions, increasing cache capacity, and so on. [0003] For the convenience of users, the new processor will be compatible with software developed based on the old processor, but existing applications (t...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the problem of high operating overhead when using alias checking instructions in the prior art to overcome the memory alias problem, thereby providing a function optimization method with small operating overhead

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