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Chapter 11 Implementing an Assembler and a Linker Using C++ and Java
An assembler must handle
Assembler pseudocode—pass 1
Symbol table How to implement?
Relationship of opcode index (position of its mnemonic in an alphabetized table) and the opcode
Computing an opcode from its table index
Opcode table in Java
Implement the symbol table using the SymbolTable class
Assembler should check for duplicate labels when making an entry into the symbol table.
Text files Contain ASCII codes exclusively. A “.mas” file is an example of a text file.
Binary files Do not contain ASCII codes exclusively. “.mob” and “.mac” files are binary files. No translation of end-of-line markers occurs during input or output of binary files.
Creates text file.
Creates binary file
Creates text file
Creates binary file
Binary input file in Java
Binary input file in C++
Reading the input text file
Creating an R entry
assemble method in Assembler class constructs machine word
Constructing the machine word requires shifting. For example, for a 4-bit opcode: Machine_word = (short)(opcode <<12) | operand_value;
To handle endian problem (e.g., if assembler written in Java and linker in C++ on a PC).
Using reverseOrder Use
Linker should detect these errors
As linker loads modules, it keeps track of its module’s starting address
Implement the P, E, R, and S tables using classes.
Implement the text buffer using a class.
Linker pseudocode—phase 1
Processing modules from a library
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