Monty 0.98 is a scripting language that is first compiled into Monty byte codes (Just like Python). It relies on a unique stack, with specific instructions to manipulate it. The goal of this project is to create an interpreter for Monty ByteCodes files.
This is a data structure principle where the element added most recently (i.e Last) is the one that is removed first. This principle is similar to stacking of plates, what approach would you use to safely add and remove plates?.
This is also a data structure principle where the element that has been in the structure the longest is the first to be removed. In an unjust world with exception of the elderly, nursing mothers, or disabled, what approach would you use to call on people on a queue?.
In this project we created a stack and queue structure, with stacks working on the LIFO principle, and queue using the FIFO principle.
A stack typicall supports two main operations:
- Push: Adds an element to the top of the stack.
- Pop: Removes the element from the top of the stack.
In a queue the pop removes elements from the bottom of the stack.
/**
* struct stack_s - doubly linked list representation of a stack (or queue)
* @n: integer
* @prev: points to the previous element of the stack (or queue)
* @next: points to the next element of the stack (or queue)
*
* Description: doubly linked list node structure
* for stack, queues, LIFO, FIFO
*/
typedef struct stack_s
{
int n;
struct stack_s *prev;
struct stack_s *next;
} stack_t;Above is a doubly linked list use to create a node of a stack or queue when required.
/**
* struct instruction_s - opcode and its function
* @opcode: the opcode
* @f: function to handle the opcode
*
* Description: opcode and its function
* for stack, queues, LIFO, FIFO
*/
typedef struct instruction_s
{
char *opcode;
void (*f)(stack_t **stack, unsigned int line_number);
} instruction_t;We utilized a list of the instruction_t structure to scan for the opcode pass per line in the bytecode file, we would be taking a walk with an example how this works.
For this project we use the gcc compiler with the following flags.
gcc -Wall -Werror -Wextra -pedantic -std=c89 *.c -o monty
For our project we wrote bash scripts for both compilation and test output from the bytefile. You can find the files compiler, and valgrind_check in the repo using link below.
How to use valgrind_check
# Executable + bytecode file
./valgrind_check 00.m