420

420 is an esoteric programming language created by User:Vriskanon. It only works on the 20th of April each year. All attempts to use it on another date will result in 420 downloading a horrible virus.

Commands

Stolen directly from Chicken, 420 works by repeating the phrase "blaze it" a certain number of times per line to do certain things.

Unlike Chicken, however, 420 must always start with a line saying "420".

Opcode	Name	Description
0	exit	Stop execution.
1	blaze it	Push the string "blaze it" onto the stack.
2	add	Add two top stack values.
3	subtract	Subtract two top stack values.
4	multiply	Multiply two top stack values.
5	compare	Compare two top stack values for equality, push truthy or falsy result onto the stack.
6	load	Double wide instruction. Next instruction indicates source to load from. 0 loads from stack, 1 loads from user input. Top of stack points to address/index to load onto stack.
7	store	Top of stack points to address/index to store to. The value below that will be popped and stored.
8	jump	Top of stack is a relative offset to jump to. The value below that is the condition. Jump only happens if condition is truthy.
9	char	Interprets the top of the stack as ascii and pushes the corresponding character.
10+	push	Pushes the literal number n-10 onto the stack.

Memory model

As in Chicken, the stack (represents the memory of the program) has three segments. The first segment contains two registers. The first register just points to the stack itself (by reference). The second register contains the user input, which is usually a string. These registers are used by the LOAD instruction. The second segment contains the loaded code. For each line of the code there is a cell on the stack containing the amount of chickens on that line. This segment is directly used for execution. It is automatically padded with a single EXIT instruction. The third segment contains the actual program stack. As instructions are executed, they will push and pop values in this space. Since the segments are not isolated, it is possible to modify values in the code space or execute in the user stack space.

Sample programs

Cat

420
blaze it blaze it blaze it blaze it blaze it blaze it blaze it blaze it blaze it blaze it blaze it
blaze it blaze it blaze it blaze it blaze it blaze it

Hello, world!

420
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