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| == The Original Code ==
| | #REDIRECT [[ist:Code Generation/Example 2]] |
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| Consider the following [[S9 Language|S9]] function:
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| <c>
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| string a = "batata";
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| int s9() -> 0 {
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| a!
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| }
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| </c>
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| == Postfix Code ==
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| The Postfix code for the above function is as follows:
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| <asm>
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| ;--- declaring the string literal
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| RODATA
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| ALIGN
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| LABEL _L123 ;; automatic label
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| STR "batata"
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| ;--- declaring the global variable "a"
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| DATA
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| ALIGN
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| LABEL a
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| ID _L123 ;; automatic label
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| ;--- this is the main function (note that "s9" translates to RTS's "_main")
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| TEXT
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| ALIGN
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| GLOBL _main, FUNC
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| LABEL _main
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| ENTER 0
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| ADDRV a ;; ADDRV = ADDR+LOAD
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| EXTRN prints
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| CALL prints
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| TRASH 4
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| INT 0
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| POP
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| LEAVE
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| RET
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| </asm>
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| == Compiling and Running ==
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| If you start from the first example, the S9 compilation process is as follows:
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| * s9 batata.s9
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| * yasm -felf batata.asm
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| * ld -o batata batata.o -lrts
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| If you want to test the second program directly, you may use [[pf2asm]]:
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| * pf2asm batata.pf
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| * yasm -felf batata.asm
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| * ld -o batata batata.o -lrts
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| [[category:Compilers]]
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| [[category:Teaching]]
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