Stapel (meaning stack is Dutch) is a stack based language which compiles to X86 assembly Linux.

• 64-bit integer
• String

Note: 0 means false, everything that is not 0 is true

• +: plus, pops first two stack values and pushes result to stack 5 3 -> 8
• -: minus, pops first two stack values and pushes result to stack 5 3 -> 2
• *: multiply, pops first two stack values and pushes result to stack 3 5 -> 15
• /: divide, pops first two stack values and pushes result to stack 10 2 -> 5
• =: equals, pops first two stack values and pushes result to stack 3 5 -> 0
• !=: notequals, pops first two stack values and pushes result to stack 3 5 -> 1
• < : lesserthan, pops first two stack values and pushes result to stack 3 5 -> 1
• >: greaterthan, pops first two stack values and pushes result to stack 3 5 -> 0
• <=: lesserorequals, pops first two stack values and pushes result to stack 3 5 -> 1
• >=: greaterorequals, pops first two stack values and pushes result to stack 3 3 -> 1
• %: modulo, divides first two stack values, divides them and pushes remainder to stack 10 7 -> 3

• push: Pushes a string or integer to the stack.
• pop: Pops top value from the stack A B -> B.
• swap: Swaps top two value A B -> B A.
• dup: Duplicates the top value on the stack A B -> A A B.
• put: Pops first value from stack and writes to stdout .
• load: Pops stack, this value is memory adress. Memory at address is read and value is pushed to the stack
• store: Pops stack twice, first value is value to store, second value is memory address.
• mem: Pushes start pointer of .bss memory to stack.
• size: Pushes size of stack to top of stack in bytes (new value is not included).
• syscallX: syscallX performs linux syscall, the X is the amount of parameters for the syscall (1 to 8). The sequence of registers to stack is first RAX than RDI, RSI, RDX, R10, etc.

• while:
• if:
• do:
• end: