Code Generation/Example 2: Difference between revisions
From Wiki**3
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... |
|||
| (18 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
== 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 | 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]] | ||
Latest revision as of 15:56, 6 May 2020
The Original Code
Consider the following C function:
const char *a = "batata";
int main() {
prints(a);
return 0;
}
Postfix Code
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
|
Compiling and Running
To test the second program directly, pf2asm can be used:
pf2asm batata.pf yasm -felf batata.asm ld -o batata batata.o -lrts