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OPCODES.md

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Simple arithmitic

  • ADD: Pops 2 elements, adds them together and pushes the result onto the stack
  • SUB Pops 2 elements, subtracts them and pushes the result onto the stack
  • MUL Pops 2 elements, multiplies them and pushes the result onto the stack
  • DIV Pops 2 elements, divides them and pushes the result onto the stack
  • MOD Pops 2 elements, uses the modulo operator on them and pushes the result onto the stack
  • NEG Pops 1 element, uses the ! operator on it and pushes the result onto the stack

Logical

  • EQUAL Pops 2 elements, checks if they're equal and pushes the result onto the stack
  • NOT_EQUAL Pops 2 elements, checks if they're not equal and pushes the result onto the stack
  • STRICT_EQUAL Pops 2 elements, checks if they're strictly equal and pushes the result onto the stack
  • STRICT_NOT_EQUAL Pops 2 elements, checks if they're strictly not equal and pushes the result onto the stack
  • GREATER_THAN Pops 2 elements, checks if the top one is greater and pushes the result onto the stack
  • LESS_THAN Pops 2 elements, checks if the top one is smaller and pushes the result onto the stack
  • LESS_THAN_EQUAL Pops 2 elements, checks if the top one is smaller or the same and pushes the result onto the stack
  • GREATER_THAN_EQUAL Pops 2 elements, checks if the top one is greater or the same and pushes the result onto the stack

Bitwise

  • AND Pops 2 elements, uses the & operator and pushes the result onto the stack
  • OR Pops 2 elements, uses the | operator and pushes the result onto the stack
  • XOR Pops 2 elements, uses the ^ operator and pushes the result onto the stack
  • NOT Pops 2 elements, uses the ~ operator and pushes the result onto the stack
  • LEFT_SHIFT Pops 2 elements, uses the << operator and pushes the result onto the stack
  • RIGHT_SHIFT Pops 2 elements, uses the >> operator and pushes the result onto the stack
  • ZERO_LEFT_SHIFT Pops 2 elements, uses the >>> operator and pushes the result onto the stack

Stack operations

  • PUSH Pushes the next byte onto the stack
  • JMP Jumps the pointer to the next byte
  • JMP_IF Jumps the pointer to the next byte if the top argument on the stack is also true (and pops that one)

Object operations

  • PUSH_THIS Pushes the window (or global) keyword onto the stack
  • MEMBER_EXPRESSION Gets the last 2 from the stack, pushes the result of a[b] to the stack
  • PUSH_ARRAY Creates an empty array and pushes it to the stack
  • PUSH_OBJECT Creates an empty object and pushes it to the stack
  • PUSH_TO_ARRAY Gets the top element from the stack, and pushes it to the second element on the stack

Other (for now)

  • EXECUTE_FUNCTION Executes the function at the top of the stack, passes in the destructured arguments from the array in the second top in the stack, if the type of the var is Array. If not, just use that as the only argument

VM operations

  • HLT Halts the execution