AAL OpCode Expressions

Intermediate OpCode for AAL.

Content of this chapter:

   Basics
   Topics
     Operators
     Short circuit boolean evaluation

Basics

Expression are evaluated to a resulting value, which should be on top of stack after execution.

Topics

Operators

id1 + id2

whereas id1/id2 can be an basic type or an Object. If both ids are basic types build in operator should be used. Otherwise an matching operator should be found.

load [id1]
load [id2]
add

or
load [id2] // argument
load [id1] // object
push "operator_pl"
push 1 // number of args and flags
invoke

Short circuit boolean evaluation

i < 9 && i > 0

If the first part of the expression i < 9 the second part of the logical expression should not be evaluated.

load [i]
push 9
lt
brfalse endofexpr // false is on TOS
pop // TOS=true not further needed
load [i]
push 0
gt // result is on TOS
:endofexpr