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| Expressions | Statements | Class | DMI Interface |

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