1. The first step in developing a hybrid implementation of a programming language is to design...

 

Transcribed Image Text:

1. The first step in developing a hybrid implementation of a programming language is to design an ab- stract machine. In order to execute a program written in the source language, we need a compiler that translates the source and generates object codes in the abstract machine language, which are in turn interpreted by an abstract machine emulator running on the target computer. Java is a good example language enjoying a hybrid implementation. (a) (2 marks) Give a disadvantage of hybrid implementations with respect to the compilation approach. Explain why. (b) (4 marks) Give two potential good uses (or advantages) of hybrid implementations over the compilation approach. (c) Jimmy has just designed a new language Ji++ with graphical programming capabilities and decided to adopt the hybrid implementation approach. As such, Jimmy designed the JiVM abstract machine, and implemented Ji++ compiler(s) and JiVM emulators using the C lan- guage. The following questions are based on the need to run Ji++ programs on the Win- dows, MacOS, and Linux platforms. Besides giving the answers, you should also provide brief justifications. (i) (2 marks) How many Ji++ compiler(s) has to be written? (ii) (2 marks) How many executable(s) of the Ji++ compiler has to be generated? (iii) (2 marks) How many JiVM emulator(s) has to be written? (iv) (2 marks) How many executable(s) of the JiVM emulator has to be generated? (v) (2 marks) During testing, Jimmy compiled his first Ji++ program on the Windows platform, and transferred the object codes to try to run on the MacOS platform. Do you think that the object codes can run successful on the MacOS? Why or why not? 1. The first step in developing a hybrid implementation of a programming language is to design an ab- stract machine. In order to execute a program written in the source language, we need a compiler that translates the source and generates object codes in the abstract machine language, which are in turn interpreted by an abstract machine emulator running on the target computer. Java is a good example language enjoying a hybrid implementation. (a) (2 marks) Give a disadvantage of hybrid implementations with respect to the compilation approach. Explain why. (b) (4 marks) Give two potential good uses (or advantages) of hybrid implementations over the compilation approach. (c) Jimmy has just designed a new language Ji++ with graphical programming capabilities and decided to adopt the hybrid implementation approach. As such, Jimmy designed the JiVM abstract machine, and implemented Ji++ compiler(s) and JiVM emulators using the C lan- guage. The following questions are based on the need to run Ji++ programs on the Win- dows, MacOS, and Linux platforms. Besides giving the answers, you should also provide brief justifications. (i) (2 marks) How many Ji++ compiler(s) has to be written? (ii) (2 marks) How many executable(s) of the Ji++ compiler has to be generated? (iii) (2 marks) How many JiVM emulator(s) has to be written? (iv) (2 marks) How many executable(s) of the JiVM emulator has to be generated? (v) (2 marks) During testing, Jimmy compiled his first Ji++ program on the Windows platform, and transferred the object codes to try to run on the MacOS platform. Do you think that the object codes can run successful on the MacOS? Why or why not?