Method and device for pre-generating machine code instruction in JavaScript scripting language

Abstract

The embodiment of the invention discloses a method and device for pre-generating a machine code instruction in a JavaScript scripting language, relates to the field of compilation of a dynamic language and solves the problem of improving the generating speed of a machine code. The concrete scheme comprises the following steps of: obtaining an intermediate code of a JavaScript script, applying for an instruction storage space capable of accommodating the total length of the instruction through querying the total length of the instruction of the machine code instruction which corresponds to the intermediate code, copying the machine code instruction in a machine code template, which corresponds to the intermediate code, to the instruction storage space, and modifying the machine code instruction relative to a pseudo register and intermediate value information according to the intermediate code. The method and the device, provided by the invention, are used for causing the intermediate code to generate the machine code instruction.

Description

technical field [0001] The invention relates to the field of dynamic language compilation, in particular to a method and device for pre-generating machine code instructions in JavaScript scripting language. Background technique [0002] JS (JavaScript) is an object-based and event-driven interpreted scripting language that can be embedded in Web pages. It is mainly interpreted and executed on the web browser, which can make the webpage have dynamic effects (such as: scrolling of pictures and text; dynamic switching, display and hiding of layers; operation of HTML (HypertextMarkupLanguage, hypertext markup language) elements); The input verification of the form can be carried out (such as: the legality of the mailbox, phone number, zip code, the length and content verification of the input content, etc.). [0003] When the web browser operates the JS engine, it will download the JavaScript script from the Internet, and then parse and generate a syntax tree according to the s...

AI Technical Summary

Problems solved by technology

[0011] In the process of realizing the above-mentioned generation of machine code based on the intermediate code, the inventor found that there are two defects in the prior art: on the one hand, if the instruction types of the two intermediate codes are the same, then the generated machine code instructions will have the same Repeated generation of machine code instructions is not efficient

On the other hand, a piece of intermediate code may generate many machine code instructions, so when the requested memory space is insufficient, it will cause several actions to re-apply for the instruction storage space, and it is necessary to copy the contents of the old instruction storage space to the new instruction storage space, resulting in high time-consuming

Images