Difference between revisions of "Code Generation/Example 2"

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< Code Generation
(Postfix Code)
Line 3: Line 3:
 
Consider the following [[S9 (language)|S9]] function:
 
Consider the following [[S9 (language)|S9]] function:
  
<c>
+
<source lang="c">
 
string a = "batata";
 
string a = "batata";
 
int s9() -> 0 {
 
int s9() -> 0 {
 
       a!
 
       a!
 
}
 
}
</c>
+
</source>
  
 
== Postfix Code ==
 
== Postfix Code ==
Line 14: Line 14:
 
The Postfix code for the above function is as follows:  
 
The Postfix code for the above function is as follows:  
 
{{CollapsedCode|Postfix code|
 
{{CollapsedCode|Postfix code|
<asm>
+
<source lang="asm">
 
;--- declaring the string literal
 
;--- declaring the string literal
 
RODATA
 
RODATA
Line 43: Line 43:
 
LEAVE
 
LEAVE
 
RET
 
RET
</asm>
+
</source>
 
}}
 
}}
  

Revision as of 12:32, 12 February 2019

The Original Code

Consider the following S9 function:

string a = "batata";
int s9() -> 0 {
      a!
}

Postfix Code

The Postfix code for the above function is as follows:

Postfix code
;--- declaring the string literal
RODATA
ALIGN
LABEL _L123  ;; automatic label
STR "batata"
;--- declaring the global variable "a"
DATA
ALIGN
LABEL a
SADDR  _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
LDINT
EXTRN prints
CALL prints
TRASH 4

INT 0
STFVAL32
LEAVE
RET

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