elna/TODO

# Intermediate code generation

- All procedure calls a generated with a single arguments. To support more
  arguments they should be put onto the stack, above the stack pointer.
  The stack can grow on demand and then be cleaned up (the call instruction
  contains the number of arguments, so the stack size can be reduced), or the
  function with most arguments can be found and the stack size allocated.
  To access the arguments inside a procedure, the information about argument
  names should be kept somewhere.

# ELF generation

- Don't ignore relocations where the symbol is not defined in the symbol table.
  Report an error about an undefined symbol.

# Name analysis

- Format error messages.
- Return non-zero error code on errors.

# Built-in

Printi should print a sign for negative numbers.