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== The Original Code == | == The Original Code == | ||
| − | Consider the following | + | Consider the following C function: |
| − | <c> | + | <source lang="c"> |
| − | + | const char *a = "batata"; | |
| − | int | + | int main() { |
| − | + | prints(a); | |
| + | return 0; | ||
} | } | ||
| − | </ | + | </source> |
== Postfix Code == | == Postfix Code == | ||
The Postfix code for the above function is as follows: | The Postfix code for the above function is as follows: | ||
| − | + | {{CollapsedCode|Postfix code| | |
| − | <asm> | + | <source lang="asm"> |
;--- declaring the string literal | ;--- declaring the string literal | ||
RODATA | RODATA | ||
ALIGN | ALIGN | ||
LABEL _L123 ;; automatic label | LABEL _L123 ;; automatic label | ||
| − | + | SSTRING "batata" | |
;--- declaring the global variable "a" | ;--- declaring the global variable "a" | ||
DATA | DATA | ||
ALIGN | ALIGN | ||
| + | GLOBAL a, OBJ | ||
LABEL a | LABEL a | ||
| − | + | SADDR _L123 ;; automatic label | |
;--- this is the main function (note that "s9" translates to RTS's "_main") | ;--- this is the main function (note that "s9" translates to RTS's "_main") | ||
TEXT | TEXT | ||
ALIGN | ALIGN | ||
| − | + | GLOBAL _main, FUNC | |
LABEL _main | LABEL _main | ||
ENTER 0 | ENTER 0 | ||
| − | + | ADDR a | |
| − | + | LDINT | |
| + | EXTERN prints | ||
CALL prints | CALL prints | ||
TRASH 4 | TRASH 4 | ||
INT 0 | INT 0 | ||
| − | + | STFVAL32 | |
LEAVE | LEAVE | ||
RET | RET | ||
| − | </asm> | + | </source> |
| + | }} | ||
| + | |||
| + | == Compiling and Running == | ||
| + | <!-- | ||
| + | To test the first example, the S9 compilation process is as follows: | ||
| + | |||
| + | s9 batata.s9 | ||
| + | yasm -felf batata.asm | ||
| + | ld -o batata batata.o -lrts | ||
| + | --> | ||
| + | To test the second program directly, [[Compiladores/Projecto de Compiladores/Compiladores Exemplo|pf2asm]] can be used: | ||
| + | |||
| + | pf2asm batata.pf | ||
| + | yasm -felf batata.asm | ||
| + | ld -o batata batata.o -lrts | ||
| − | [[category: | + | [[category:Compiladores]] |
| − | [[category: | + | [[category:Ensino]] |
Consider the following C function:
const char *a = "batata";
int main() {
prints(a);
return 0;
}
The Postfix code for the above function is as follows:
| Postfix code |
|---|
;--- declaring the string literal
RODATA
ALIGN
LABEL _L123 ;; automatic label
SSTRING "batata"
;--- declaring the global variable "a"
DATA
ALIGN
GLOBAL a, OBJ
LABEL a
SADDR _L123 ;; automatic label
;--- this is the main function (note that "s9" translates to RTS's "_main")
TEXT
ALIGN
GLOBAL _main, FUNC
LABEL _main
ENTER 0
ADDR a
LDINT
EXTERN prints
CALL prints
TRASH 4
INT 0
STFVAL32
LEAVE
RET
|
To test the second program directly, pf2asm can be used:
pf2asm batata.pf yasm -felf batata.asm ld -o batata batata.o -lrts