ChickenVM

@igorwesome

not about chicken scheme

drinking game

why did the chicken cross the road?

what came first, the chicken or the egg?

does the chicken of all chickens that don’t contain themselves contain itself?

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chicken.js

JavaScript is the assembly of the web

function chicken(CHICKEN, Chicken) { Chicken &&( chicken. chicken =[, CHICKEN, CHICKEN = Chicken = chicken. $Chicken =-( CHICKEN ==( chicken. Chicken = Chicken ))], chicken. chicken [Chicken++] = chicken. chicken, chicken. CHICKEN = ++Chicken, chicken (--Chicken), chicken. $Chicken = ++Chicken, chicken. CHICKEN++ ); Chicken = chicken. Chicken [chicken. $Chicken++ ]; chicken. Chicken = CHICKEN? Chicken? '\012'== Chicken? chicken (++ CHICKEN, chicken. chicken [++ chicken. CHICKEN ]= CHICKEN - CHICKEN ): Chicken ==' '|'\015'== Chicken || (Chicken )== "c" & chicken. Chicken [chicken. $Chicken++ ]== "h" & chicken. Chicken [chicken. $Chicken++ ]== "i" & chicken. Chicken [chicken. $Chicken++ ]== "c" & chicken. Chicken [chicken. $Chicken++ ]== "k" & chicken. Chicken [chicken. $Chicken++ ]== "e" & chicken. Chicken [chicken. $Chicken++ ]== "n"&&++chicken. chicken [chicken. CHICKEN]? chicken (CHICKEN) :[ "Error on line "+CHICKEN+": expected 'chicken'", chicken. CHICKEN = CHICKEN ++- CHICKEN ]: chicken. chicken :( CHICKEN = chicken. Chicken[chicken.CHICKEN], Chicken? (Chicken = } --Chicken? --Chicken? --Chicken? --Chicken? --Chicken? --Chicken? --Chicken? --Chicken? --Chicken? chicken. CHICKEN++ && --Chicken :''+CHICKEN+';': chicken. Chicken [chicken. Chicken [-- chicken. CHICKEN ]&& (chicken. $Chicken += CHICKEN), --chicken. CHICKEN ]: chicken. Chicken [chicken. Chicken [CHICKEN] = chicken. Chicken [-- chicken. CHICKEN ],-- chicken. CHICKEN ]: chicken. Chicken [chicken. Chicken [chicken. $Chicken++ ]] [CHICKEN]: CHICKEN == chicken. Chicken [-- chicken. CHICKEN ]: CHICKEN*chicken. Chicken [-- chicken. CHICKEN ]: chicken. Chicken [-- chicken. CHICKEN ]- CHICKEN: chicken. Chicken [-- chicken. CHICKEN ]+ CHICKEN: chicken. CHICKEN ++ && "chicken", chicken. Chicken [chicken. CHICKEN ]= Chicken, chicken ()): CHICKEN ); return chicken. Chicken

50 LOC

cat chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken ␊ chicken chicken chicken chicken chicken chicken ␊

quine chicken

Spec Every line in the program is inspected for chickens, and the corresponding number of chickens are pushed onto the stack. Execution is done directly on the stack, which may make the program susceptible to arbitrary chicken injection attacks.

0 axe Terminates all chickens. 1 chicken Pushes “chicken” onto the stack. 2 add Adds two topmost groups of chickens. 3 fox Topmost chickens become foxes. Subtract. 4 rooster Causes two topmost groups to multiply. 4.5 fence Divides chickens. Cannot be used. 5 compare Compares, pushes truthy or falsy chicken. 6 pick Pop address, pop source. 0 stack, 1 input. 7 peck Pop address, store value. 8 fr Pop offset, pop cond. If cond, fly to offset. 9 BBQ Chars the topmost group into ASCII. n Pushes n-10 chickens onto the stack.

disassembling the chicken

• Same variables with different case or prefix • Long chains of conditional evaluation • Increment, decrement, parentheses, commas, ternaries • Variable re-definition • Store values on the function object • Recursion

function chicken(CHICKEN, Chicken) { Chicken && (chicken.chicken = [, CHICKEN, CHICKEN = Chicken = chicken.$Chicken = -(CHICKEN == (chicken.Chicken = Chicken)) ], chicken.chicken[Chicken++] = chicken.chicken, chicken.CHICKEN = ++Chicken, chicken(--Chicken), chicken. $Chicken = ++Chicken, chicken.CHICKEN++); Chicken = chicken.Chicken[chicken.$Chicken++]; chicken.Chicken = CHICKEN ? Chicken ? '\012' == Chicken ? chicken(++CHICKEN, chicken.chicken[++chicken.CHICKEN] = CHICKEN - CHICKEN) : Chicken == ' ' | '\015' == Chicken || (Chicken) == "c" & chicken.Chicken[chicken.$Chicken++] == "h" & chicken.Chicken[chicken.$Chicken++] == "i" & chicken.Chicken[chicken.$Chicken++] == "c" & chicken.Chicken[chicken.$Chicken++] == "k" & chicken.Chicken[chicken.$Chicken++] == "e" & chicken.Chicken[chicken.$Chicken++] == "n" && + +chicken.chicken[chicken.CHICKEN] ? chicken(CHICKEN) : ["Error on line " + CHICKEN + ": expected 'chicken'", chicken.CHICKEN = CHICKEN++-CHICKEN ] : chicken.chicken : (CHICKEN = chicken.Chicken[chicken.CHICKEN], Chicken ? (Chicken = --Chicken ? --Chicken ? --Chicken ? --Chicken ? --Chicken ? --Chicken ? --Chicken ? --Chicken ? --Chicken ? chicken.CHICKEN++ && --Chicken : '' + CHICKEN + ';' : chicken.Chicken[chicken.Chicken[--chicken.CHICKEN] && (chicken.$Chicken += CHICKEN), --chicken.CHICKEN] : chicken.Chicken[chicken.Chicken[CHICKEN] = chicken.Chicken[--chicken.CHICKEN], --chicken.CHICKEN] : chicken.Chicken[chicken.Chicken[chicken.$Chicken++]][CHICKEN] : CHICKEN == chicken.Chicken[-- chicken.CHICKEN] : CHICKEN * chicken.Chicken[--chicken.CHICKEN] : chicken.Chicken[--chicken.CHICKEN] - CHICKEN : chicken.Chicken[--chicken.CHICKEN] + CHICKEN : chicken.CHICKEN++ && "chicken", chicken.Chicken[chicken.CHICKEN] = Chicken, chicken()) : CHICKEN); return chicken.Chicken }

function chicken(CHICKEN, Chicken)

function chicken(code, input)

function chicken(code, input) { if (input) { chicken.chicken = [ , code, code = input = chicken.$Chicken = -(code == (chicken.Chicken = input)) ]; chicken.chicken[input++] = chicken.chicken; chicken.CHICKEN = ++input; chicken(--input); chicken.$Chicken = ++input; chicken.CHICKEN++; }

• Restructure • Step through debugger • Stare until eyes fall out • Rename variable • Rinse, repeat... Strategy

readable version

var code = "", stack = [], $sp = -1, $ip = 0, $cp = 0; function inc() { stack[$sp]++; return true; } function push(value) { stack[++$sp] = value; } function pop() { return stack[$sp--]; } function peek() { return stack[$sp]; }

function chicken(input, le_code) { code = le_code; $cp = 0; $sp = -1; stack = []; push(stack); push(input); push(0); read_line(1); return run_loop(); }

function read_line(line) { var character = code[$cp++]; if (!character) { return; } if ('\012' == character) { // LF line++; push(0); return read_line(line); } if (character == ' ' || (character == "c" && code[$cp++] == "h" && code[$cp++] == "i" && code[$cp++] == "c" && code[$cp++] == "k" && code[$cp++] == "e" && code[$cp++] == "n") && inc()) { return read_line(line); } $sp = 0; stack = [ 0x0, "Error on line "+line+": expected 'chicken'" ]; }

function run_loop() { var instruction; $ip = 2; push(0); while (instruction = stack[$ip++]) { process_instruction(instruction); } return peek(); }

function process_instruction(instruction) { var head; switch (instruction) { case 1: push("chicken"); break; case 2: head = pop(); push(pop() + head); break; case 3: head = pop(); push(pop() - head); break; case 4: push(pop() * pop()); break; case 5: push(pop() == pop()); break; case 6: head = pop(); push(stack[stack[$ip++]][head]); break; case 7: head = pop(); stack[head] = pop(); break; case 8: head = pop(); if (pop()) { $ip += head; } break; case 9: push(''+pop()+';'); break; default: push(instruction - 10); break; } }

memory init

&stack &input 0 ip sp

parsing

&stack &input 0 ip sp chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken ␊ chicken chicken chicken chicken chicken chicken ␊

&stack &input 0 sp chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken ␊ chicken chicken chicken chicken chicken chicken ␊ ip

&stack &input 1 sp chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken ␊ chicken chicken chicken chicken chicken chicken ␊ ip

&stack &input 2 sp chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken ␊ chicken chicken chicken chicken chicken chicken ␊ ip

&stack &input 3 sp chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken ␊ chicken chicken chicken chicken chicken chicken ␊ ip

&stack &input 4 sp chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken ␊ chicken chicken chicken chicken chicken chicken ␊ ip

&stack &input 5 sp chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken ␊ chicken chicken chicken chicken chicken chicken ␊ ip

&stack &input 6 sp chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken ␊ chicken chicken chicken chicken chicken chicken ␊ ip

&stack &input 7 sp chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken ␊ chicken chicken chicken chicken chicken chicken ␊ ip

&stack &input 8 sp chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken ␊ chicken chicken chicken chicken chicken chicken ␊ ip

&stack &input 9 sp chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken ␊ chicken chicken chicken chicken chicken chicken ␊ ip

&stack &input 10 sp chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken ␊ chicken chicken chicken chicken chicken chicken ␊ ip

&stack &input 11 sp chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken ␊ chicken chicken chicken chicken chicken chicken ␊ ip

&stack &input 11 0 sp chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken ␊ chicken chicken chicken chicken chicken chicken ␊ ip

&stack &input 11 1 sp chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken ␊ chicken chicken chicken chicken chicken chicken ␊ ip

&stack &input 11 2 sp chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken ␊ chicken chicken chicken chicken chicken chicken ␊ ip

&stack &input 11 3 sp chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken ␊ chicken chicken chicken chicken chicken chicken ␊ ip

&stack &input 11 4 sp chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken ␊ chicken chicken chicken chicken chicken chicken ␊ ip

&stack &input 11 5 sp chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken ␊ chicken chicken chicken chicken chicken chicken ␊ ip

&stack &input 11 6 sp chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken ␊ chicken chicken chicken chicken chicken chicken ␊ ip

&stack &input 11 6 0 sp chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken ␊ chicken chicken chicken chicken chicken chicken ␊ ip

execution

&stack &input 11 6 0 sp ip

&stack &input 11 6 0 sp set the code pointer to the beginning of the code segment ip

&stack &input 11 6 0 0 sp delimit code segment with an exit opcode ip

&stack &input 11 6 0 0 sp }addresses instructions stack } } ip

&stack &input 11 6 0 0 sp start executing opcodes ip

&stack &input 11 6 0 0 sp 11 = push 1 ip

&stack &input 11 6 0 0 1 sp push(1) ip

&stack &input 11 6 0 0 1 sp 6 = load ip

&stack &input 11 6 0 0 1 sp 6, 0 = load stack[0] ip source

&stack &input 11 6 0 0 1 sp push(&stack[pop()]) ip source

&stack &input 11 6 0 0 1 sp push(&stack[1]) ip

&stack &input 11 6 0 0 &input push(&input) ip sp

&stack &input 11 6 0 0 &input 0 = exit ip sp

&stack &input 11 6 0 0 &input return head of stack to caller which is: &input ip sp

&stack &input 1 0 sp what about the quine? ip

&stack &input 1 0 sp 1 = chicken ip

&stack &input 1 0 “chicken” sp push(“chicken”) ip

&stack &input 1 0 “chicken” sp 0 = exit ip

&stack &input 1 0 “chicken” sp ip return “chicken”

eggsembly

push 5 push 13 rooster bbq axe chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken␊ chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken chicken␊ chicken chicken chicken chicken␊ chicken chicken chicken chicken chicken chicken chicken chicken chicken␊ eggsemble

push 5 push 13 rooster bbq axe push 5 push 13 multiply char exit chicken asm

$ cat 99chickens.cha | chickenasm | eggsemble | chicken

written in

count

&stack &input ... ... ... sp 3

&stack &input ... ... ... ip push 0 push 2 store push 0 push 32 char add push 3 store 3 sp

&stack &input ... ... ... ip push 0 push 2 store push 0 push 32 char add push 3 store write 0 into register 2 } 3 sp

&stack &input 0 ... ... ip push 0 push 2 store push 0 push 32 char add push 3 store i 3 write 0 into register 2 } sp

&stack &input 0 ... ... ip push 0 push 2 store push 0 push 32 char add push 3 store write “0” into register 3 } i 3 write 0 into register 2 } sp

&stack &input 0 “0 “ ... ip push 0 push 2 store push 0 push 32 char add push 3 store i out 3 write 0 into register 2 } write “0” into register 3 } sp

&stack &input 0 “0 “ ... ip i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 3 sp

&stack &input 0 “0 “ ... ip i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 load register 2 i } 3 sp

&stack &input 0 “0 “ ... 0 sp ip i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 load register 2 i } 3

&stack &input 0 “0 “ ... 0 ip i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 load register 2 i } load register 1 input } 3 sp

&stack &input 0 “0 “ ... 0 3 sp ip i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 load register 2 i } load register 1 input } 3

&stack &input 0 “0 “ ... 0 3 ip i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 load register 2 i } load register 1 input } 3 compare } sp

&stack &input 0 “0 “ ... ip i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 load register 2 i } load register 1 input } 3 compare } false sp

&stack &input 0 “0 “ ... ip i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 load register 2 i } load register 1 input } 3 compare } false if true, jump to end } sp

&stack &input 0 “0 “ ... ip i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 load register 2 i } load register 1 input } 3 compare } false if true, jump to end } sp

&stack &input 0 “0 “ ... ip i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 load register 2 i } load register 1 input } 3 compare } if true, jump to end } sp

&stack &input 0 “0 “ ... ip i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 load register 2 i } load register 1 input } 3 compare } if true, jump to end } load register 2 i } sp

&stack &input 0 “0 “ ... 0 ip i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 load register 2 i } load register 1 input } 3 compare } if true, jump to end } load register 2 i } sp

&stack &input 0 “0 “ ... 0 ip i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 load register 2 i } load register 1 input } 3 compare } if true, jump to end } load register 2 i } increment } sp

&stack &input 0 “0 “ ... 1 ip i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 load register 2 i } load register 1 input } 3 compare } if true, jump to end } load register 2 i } increment } sp

&stack &input 0 “0 “ ... 1 ip i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 load register 2 i } load register 1 input } 3 compare } if true, jump to end } load register 2 i } increment } store register 2 i } sp

&stack &input 1 “0 “ ... ip i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 load register 2 i } load register 1 input } 3 compare } if true, jump to end } load register 2 i } increment } store register 2 i } sp

&stack &input 1 “0 “ ... ip i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 } 3 compare i to input if true, jump to end } increment i } sp

&stack &input 1 “0 “ ... ip i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 } 3 compare i to input if true, jump to end } increment i } append “i” to out } sp

&stack &input 1 “0 1 “ ... ip i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 } 3 compare i to input if true, jump to end } increment i } }append “i” to out sp

&stack &input 1 “0 1 “ ... ip i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 } 3 compare i to input if true, jump to end } increment i } }append “i” to out jump to start } sp

&stack &input 1 “0 1 “ ... ip i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 } 3 compare i to input if true, jump to end } increment i } }append “i” to out jump to start } sp

&stack &input 1 “0 1 “ ... ip i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 } 3 compare i to input if true, jump to end } increment i } }append “i” to out jump to start } sp

&stack &input 1 “0 1 “ ... ip i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 } 3 compare i to input if true, jump to end } increment i } }append “i” to out jump to start } sp

&stack &input 1 “0 1 “ ... ip i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 } 3 compare i to input if true, jump to end } increment i } }append “i” to out jump to start } false sp

&stack &input 1 “0 1 “ ... ip i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 } 3 compare i to input if true, jump to end } increment i } }append “i” to out jump to start } sp

&stack &input 2 “0 1 “ ... ip i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 } 3 compare i to input if true, jump to end } increment i } }append “i” to out jump to start } sp

&stack &input 2 “0 1 2 “ ... ip i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 } 3 compare i to input if true, jump to end } increment i } }append “i” to out jump to start } sp

&stack &input 2 “0 1 2 “ ... i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 } 3 compare i to input if true, jump to end } increment i } }append “i” to out jump to start } ip sp

&stack &input 2 “0 1 2 “ ... i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 } 3 compare i to input if true, jump to end } increment i } }append “i” to out jump to start } ip sp

&stack &input 2 “0 1 2 “ ... i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 } 3 compare i to input if true, jump to end } increment i } }append “i” to out jump to start } ip sp

&stack &input 2 “0 1 2 “ ... i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 } 3 compare i to input if true, jump to end } increment i } }append “i” to out jump to start } ip false sp

&stack &input 2 “0 1 2 “ ... i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 } 3 compare i to input if true, jump to end } increment i } }append “i” to out jump to start } ip sp

&stack &input 3 “0 1 2 “ ... i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 } 3 compare i to input if true, jump to end } increment i } }append “i” to out jump to start } ip sp

&stack &input 3 “0 1 2 3 “ ... i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 } 3 compare i to input if true, jump to end } increment i } }append “i” to out jump to start } ip sp

&stack &input 3 “0 1 2 3 “ ... i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 } 3 compare i to input if true, jump to end } increment i } }append “i” to out jump to start } ip sp

&stack &input 3 “0 1 2 3 “ ... i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 } 3 compare i to input if true, jump to end } increment i } }append “i” to out jump to start } ip sp

&stack &input 3 “0 1 2 3 “ ... i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 } 3 compare i to input if true, jump to end } increment i } }append “i” to out jump to start } ip sp

&stack &input 3 “0 1 2 3 “ ... i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 } 3 compare i to input if true, jump to end } increment i } }append “i” to out jump to start } ip true sp

&stack &input 3 “0 1 2 3 “ ... i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 } 3 compare i to input if true, jump to end } increment i } }append “i” to out jump to start } ip sp

&stack &input 3 “0 1 2 3 “ ... i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 } 3 compare i to input if true, jump to end } increment i } }append “i” to out jump to start } ip sp

&stack &input 3 “0 1 2 3 “ ... i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 } 3 compare i to input if true, jump to end } increment i } }append “i” to out jump to start } ip sp

&stack &input 3 “0 1 2 3 “ ... i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 } 3 compare i to input if true, jump to end } increment i } }append “i” to out jump to start } ip load out } sp

&stack &input 3 “0 1 2 3 “ ... “0 1 2 3 “ i out push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 } 3 compare i to input if true, jump to end } increment i } }append “i” to out jump to start } ip load out } sp

&stack &input 3 “0 1 2 3 “ ... “0 1 2 3 “ i out 3 “0 1 2 3 “ is returned to caller sp

push 2 load 0 push 1 load 0 compare push 24 jump push 2 load 0 push 1 add push 2 store push 3 load 0 push 2 load 0 add push 32 char add push 3 store push 1 push 0 push 33 subtract jump push 3 load 0 loop break

arbitrary chicken injection

&stack &input ... ... ip push 11 push 12 push 2 push 0 push 1 push 1 jump sp

&stack &input ... ... 11 ip push 11 push 12 push 2 push 0 push 1 push 1 jump sp

&stack &input ... ... 11 12 ip push 11 push 12 push 2 push 0 push 1 push 1 jump sp

&stack &input ... ... 11 12 2 ip push 11 push 12 push 2 push 0 push 1 push 1 jump sp

&stack &input ... ... 11 12 2 0 ip push 11 push 12 push 2 push 0 push 1 push 1 jump sp

&stack &input ... ... 11 12 2 0 ip push 11 push 12 push 2 push 0 push 1 push 1 jump sp ip

&stack &input ... ... 11 12 2 0 ip push 11 push 12 push 2 push 0 push 1 push 1 jump sp ip

&stack &input ... ... 11 12 2 0 ip push(1) sp

&stack &input ... ... 11 12 2 0 ip push(1) 1 sp

&stack &input ... ... 11 12 2 0 ip push(2) 1 sp

&stack &input ... ... 11 12 2 0 ip push(2) 1 2 sp

&stack &input ... ... 11 12 2 0 ip add 1 2 sp

&stack &input ... ... 11 12 2 0 ip add 3 sp

&stack &input ... ... 11 12 2 0 ip exit 3 sp

&stack &input ... ... 11 12 2 0 ip return 3 to caller 3 sp

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v @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^

v @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ ip

v @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ ip

v @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 3 ip

v @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 3 0 ip

v @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 3 0 0 ip

v @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 3 0 0 ip

3 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ ip [n]

3 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 0 ip [n]

3 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 0 1 ip [n]

3 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 0 1 0 ip [n]

3 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 0 1 0 ip [n]

30 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ ip [n,i]

30 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 0 ip [n,i]

30 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ ip [n,i] Output: 0

30 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ ip [n,i] Output: 0

30 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 32 ip [n,i] Output: 0

30 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 32 ip [n,i] Output: 0

30 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ ip [n,i] Output: 0

30 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ ip [n,i] Output: 0

30 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 0 ip [n,i] Output: 0

30 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 0 0 ip [n,i] Output: 0

30 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 3 ip [n,i] Output: 0

30 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 3 1 ip [n,i] Output: 0

30 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 3 1 0 ip [n,i] Output: 0

30 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 3 0 ip [n,i] Output: 0

30 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 3 0 ip [n,i] Output: 0

30 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ [n,i] Output: 0 ip

30 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ [n,i] Output: 0 ip

30 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ [n,i] Output: 0 ip

30 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ [n,i] Output: 0 ip

30 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 1 [n,i] Output: 0 ip

30 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 1 0 [n,i] Output: 0 ip

30 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 0 [n,i] Output: 0 ip

30 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 0 1 [n,i] Output: 0 ip

30 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 1 [n,i] Output: 0 ip

30 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 1 1 [n,i] Output: 0 ip

30 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 1 1 0 [n,i] Output: 0 ip

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ [n,i] Output: 0 ip

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 1 [n,i] Output: 0 ip

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 1 0 [n,i] Output: 0 ip

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 1 [n,i] Output: 0 ip

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ [n,i] Output: 0 1 ip

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ [n,i] Output: 0 1 ip

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 32 [n,i] Output: 0 1 ip

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ [n,i] Output: 0 1 ip

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ [n,i] Output: 0 1 ip

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ [n,i] Output: 0 1 ip

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 0 ip [n,i] Output: 0 1

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 0 0 ip [n,i] Output: 0 1

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 3 ip [n,i] Output: 0 1

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 3 1 ip [n,i] Output: 0

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 3 1 0 ip [n,i] Output: 0 1

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 3 1 ip [n,i] Output: 0 1

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 3 1 [n,i] Output: 0 1 ip

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ [n,i] Output: 0 1 ip

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ [n,i] Output: 0 1 ip

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ [n,i] Output: 0 1 ip

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ [n,i] Output: 0 1 ip

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 1 [n,i] Output: 0 1 ip

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 1 0 [n,i] Output: 0 1 ip

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 1 [n,i] Output: 0 1 ip

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 1 1 [n,i] Output: 0 1 ip

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 2 [n,i] Output: 0 1 ip

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 2 1 [n,i] Output: 0 1 ip

31 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 2 1 0 [n,i] Output: 0 1 ip

32 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ [n,i] Output: 0 1 ip

32 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 1 [n,i] Output: 0 1 ip

32 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 1 0 [n,i] Output: 0 1 ip

32 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 2 [n,i] Output: 0 1 ip

32 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ [n,i] Output: 0 1 2 ip

32 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ [n,i] Output: 0 1 2 ip

32 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 32 [n,i] Output: 0 1 2 ip

32 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ [n,i] Output: 0 1 2 ip

32 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ [n,i] Output: 0 1 2 ip

32 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ [n,i] Output: 0 1 2 ip

32 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 3 2 [n,i] Output: 0 1 2 ip

32 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ [n,i] Output: 0 1 2 ip

32 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ [n,i] Output: 0 1 2 ip

32 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ [n,i] Output: 0 1 2 ip

32 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 3 [n,i] Output: 0 1 2 ip

33 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ [n,i] Output: 0 1 2 3 ip

33 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ [n,i] Output: 0 1 2 3 ip

33 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ [n,i] Output: 0 1 2 3 ip

33 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ 3 3 [n,i] Output: 0 1 2 3 ip

33 @ > & 00p 0 10p ;; 0. ;; " ", ;; > 00g 10g w @ v < > 10g 1+ 10p ;; 10g. ;; " ", ^ [n,i] Output: 0 1 2 3 ip

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int sp = 0; double val[MAXVAL]; void push(double f) { val[sp++] = f; } double pop(void) { return val[--sp]; }

/* reverse Polish calculator */ int main(int argc, char **argv) { int type; double op2; char s[MAXOP]; while ((type = getop(s)) != EOF) { switch (type) { case NUMBER: push(atof(s)); break; case '+': push (pop() + pop()) ; break; case '*': push(pop() * pop()); break; case '-': op2 = pop(); push(pop() - op2); break; case '/': op2 = pop(); if (op2 != 0.0) push(pop() / op2); else printf("error: zero divisor\n"); break; case '\n': printf("\t%.8g\n", pop()); break; default: printf("error: unknown command %s\n", s); break; } } return 0; }

RPN calculator 3 4 + 7 5 5 * 25 2 3 + 2 * 10

mandatory XKCD

brainfuck

>+++++++++[<+++++++ +>-]<.>+++++++[<+++ +>-]<+.+++++++..++ +.>>>++++++++[<+++ +>-]<.>>>++++++++++[< +++++++++>-]<---.<<<<. +++.------.--------.>>+.

0 0 0 0 0 0 0 0 0 p

on turing completeness

chicken in chicken?

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References • Paper by Doug Zongker isotropic.org/papers/chicken.pdf youtube.com/watch?v=yL_-1d9OSdk • Chicken.js by Torbjörn Söderstedt torso.me/chicken

Chicken • Chicken • Chicken • Chicken

Questions? • Chicken Chicken Chicken • github.com/igorw/chicken-php • github.com/igorw/befunge-php • github.com/igorw/brainfuck-php • @igorwesome