Translators

• Give one reason why some compilers produce their final output in an intermediate language instead of machine code?

  Processor code is more portable
• intermediate language is a language that is used to translate between two different languages.
•  Translators can be either compliers, interpreters, or assemblers.
• A computer system is not able to execute source code programs without the source code first being translated into machine code.
• Assemblers translate assembly code to machine code
• Compliers: translates code from high level language to machine code

  • Pro: the user does not need a translator installed already and it code does not need to be translated again - faster running time.
  • Con: Errors are reported at the end of the translation - Disadvantage for large programs
• Compliers: translates code from high level language to machine code
• Compliers

  • Pro: the user does not need a translator installed already and it code does not need to be translated again - faster running time.
  • Con: Errors are reported at the end of the translation - Disadvantage for large programs
• Interpreters execute the code, compliers dont execute code.
• Interpreters:

  • Translates and execute each line of code one by one.
  • Each line is syntax checked. If found the code stops.
• Intepreters

  • Pro: This line-by-line approach allows the developer to test the program and to quickly identify errors
  • Cons: User must have intepreter installed first. Runs more slowly than compiled code, each time the program is run, it must be translated all over again.
• Interpreters use bytecode as an intermediate stage to speed up the translation process. The code is compiled to produce bytecode which is interpreted by a virtual machine.
• What is a benefit of source code being publicly available?

  It allows people to test and check for errors.
• How does public availability of source code enhance security?

  It allows for testing to identify flaws in the software.
• What are the benefits of having publicly available source code?

  • People can test and check for errors
  • Security can be tested to identify flaws
• Virtual Machine (VM)

  A software layer thats, responsible for executing intermediate language code.
• Compliers are faster and have early error detection
• Disadvantage of Assembly code 1. Harder to understand by humans 2. Takes a lot of time to code