Code Generation/Example 2: Difference between revisions
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(New page: == The Original Code == Consider the following S9 function: <c> string a = "ola"; int s9() -> 0 { a! } </c> == Postfix Code == The Postfix code for the above func...) |
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| Line 18: | Line 18: | ||
RODATA | RODATA | ||
ALIGN | ALIGN | ||
LABEL | LABEL _L123 ;; automatic label | ||
STR "ola" | STR "ola" | ||
;--- declaring the global variable "a" | ;--- declaring the global variable "a" | ||
| Line 32: | Line 32: | ||
LABEL _main | LABEL _main | ||
ENTER 0 | ENTER 0 | ||
ADDRV a | |||
ADDRV a ;; ADDRV = ADDR+LOAD | |||
EXTRN prints | EXTRN prints | ||
CALL prints | CALL prints | ||
TRASH 4 | TRASH 4 | ||
INT 0 | INT 0 | ||
POP | POP | ||
Revision as of 07:30, 25 May 2009
The Original Code
Consider the following S9 function:
<c> string a = "ola"; int s9() -> 0 {
a!
} </c>
Postfix Code
The Postfix code for the above function is as follows:
<asm>
- --- declaring the string literal
RODATA ALIGN LABEL _L123 ;; automatic label STR "ola"
- --- declaring the global variable "a"
DATA ALIGN LABEL a ID zum ;; deveria ser automático
- --- this is the main function (note that "s9" translates to RTS's "_main")
TEXT ALIGN GLOBL _main, FUNC LABEL _main ENTER 0
ADDRV a ;; ADDRV = ADDR+LOAD EXTRN prints CALL prints TRASH 4
INT 0 POP LEAVE RET </asm>