Difference between revisions of "Code Generation/Example 2"

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< Code Generation
(Compiling and Running)
(Postfix Code)
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The Postfix code for the above function is as follows:  
 
The Postfix code for the above function is as follows:  
 
+
{{CollapsedCode|Postfix code|
 
<asm>
 
<asm>
 
;--- declaring the string literal
 
;--- declaring the string literal
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ENTER 0
 
ENTER 0
  
ADDRV a   ;; ADDRV = ADDR+LOAD
+
ADDR a
 +
LOAD
 
EXTRN prints
 
EXTRN prints
 
CALL prints
 
CALL prints
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RET
 
RET
 
</asm>
 
</asm>
 +
}}
  
 
== Compiling and Running ==
 
== Compiling and Running ==

Revision as of 08:27, 9 May 2017

The Original Code

Consider the following S9 function:

<c> string a = "batata"; int s9() -> 0 {

     a!

} </c>

Postfix Code

The Postfix code for the above function is as follows:

Postfix code

<asm>

--- declaring the string literal

RODATA ALIGN LABEL _L123  ;; automatic label STR "batata"

--- declaring the global variable "a"

DATA ALIGN LABEL a ID _L123  ;; automatic label

--- this is the main function (note that "s9" translates to RTS's "_main")

TEXT ALIGN GLOBL _main, FUNC LABEL _main ENTER 0

ADDR a LOAD EXTRN prints CALL prints TRASH 4

INT 0 POP LEAVE RET </asm>

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, pf2asm can be used:

pf2asm batata.pf
yasm -felf batata.asm
ld -o batata batata.o -lrts