mirror of
https://github.com/ksherlock/x65.git
synced 2024-06-12 07:29:28 +00:00
49 lines
959 B
Markdown
49 lines
959 B
Markdown
# Eval Functions
|
|
|
|
Eval Functions are used like symbols in expressions but are always followed by parenthesis with optional arguments.
|
|
|
|
### DEFINED, DEF
|
|
|
|
.if .def(symbol)
|
|
.endif
|
|
|
|
Evaluates to 1 if the symbol has been defined or 0 if it has not been encountered to this point in the current assembly.
|
|
|
|
### REFERENCED
|
|
|
|
.if .referenced(symbol)
|
|
.endif
|
|
|
|
Evaluates to 1 if the symbol has been referenced in the current assembly, the symbol should be defined at this point.
|
|
|
|
### BLANK
|
|
|
|
.if .blank()
|
|
.endif
|
|
|
|
Evaluates to 1 if the contents within the parenthesis is empty, primarily for use within macros.
|
|
|
|
### CONST
|
|
|
|
if .const(symbol)
|
|
.endif
|
|
|
|
Evaluates to 1 if the symbol has been declared CONST, the symbol should be defined at this point.
|
|
|
|
### SIZEOF
|
|
|
|
STRUCT Module {
|
|
word Init
|
|
word Update
|
|
word Shutdown
|
|
}
|
|
|
|
ds SIZEOF( Module )
|
|
|
|
Returns the byte size of a given struct.
|
|
|
|
### TRIGSIN
|
|
|
|
Not implemented, experimental math feature, currently returns 0.
|
|
|