The COMP4403/COMP7402 Compiler assignment entails analysis of PL0 Compiler Java Source Code. So,you’ll need to understand how the Parser works and what the lexical Tokens are.

COMP4403/COMP7402 Compiler assignment : PL0 Compiler Java Source Code

PL0 Compiler Java Source Code (Java-CUP generated version). Firstly,the main changes from the assignment 1 compiler are in the package parse which makes use of the parser and lexical analyser generators. Secondly, the Java files that make up the compiler are listed below, along with a brief description of their purpose. The source code for the compiler is divided into the following packages: pl0 contains the Java files for the main program for the compiler parse contains the Java files to handle scanning and parsing.  As well as defining the lexical tokens (major changes from assignment 1 approach).  Tree contains the abstract syntax tree, the static semantic checker and the code generator syms contains the symbol table, its entries, and type descriptors machine contains the Java files for the stack machine interpreter, instruction set operation codes, and instructions.

source contains the Java files for processing the source input and handling error messages Package pl0 You shouldn’t need to look in here too much. The main program defines some command line arguments that may be useful.

COMP4403/COMP7402 Compiler assignment : PL0 Compiler Java Source Code

PL0_LALR.java (class) The main program for the compiler (“LALR” stands for the LALR parser generator Java-CUP). Package machine You may want to look inside the stack machine at some stage to work out exactly what an instruction does. Instruction.java (class) Defines the different formats of instruction. Operation.java (enumeration) Define the operation codes for the stack machine. StackMachine.java (class) Implements an interpreter for the Stack Machine. Package parse 6/30/2020 COMP4403/COMP7402. Assignment 2 Compiler https://learn.uq.edu.au/bbcswebdav/pid-5316913-dt-content-rid-26375372_1/courses/COMP4403S_7020_21490/a2-README.html 2/4. You’ll need to understand how the Parser works and what the lexical Tokens are, but you shouldn’t need to look at the Scanner. The whole approach to parsing is completely different to assignment 1. PL0.cup (Java-CUP specification for PL0 parser) The parser recognises the input program and creates and abstract syntax tree.

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