(→Postfix Code) |
(→Postfix Code) |
||
| Line 18: | Line 18: | ||
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> | ||
EXTRN printf | EXTRN printf | ||
| Line 30: | Line 30: | ||
; int ix = lo is NOT an assignment | ; int ix = lo is NOT an assignment | ||
| − | + | LOCAL +8 | |
| − | + | LOAD ; read lo | |
| + | LOCAL -4 | ||
| + | STORE ; write to ix | ||
ALIGN | ALIGN | ||
LABEL whiletest | LABEL whiletest | ||
| − | + | LOCAL -4 | |
| − | + | LOAD ; read ix | |
| + | LOCAL +12 | ||
| + | LOAD ; read hi | ||
LT | LT | ||
JZ whileend | JZ whileend | ||
| Line 44: | Line 48: | ||
; prepare arguments for calling printf | ; prepare arguments for calling printf | ||
| − | + | LOCAL -4 | |
| + | LOAD ; second printf arg: read ix | ||
; put string literal in read-only memory | ; put string literal in read-only memory | ||
| Line 68: | Line 73: | ||
; increment ix | ; increment ix | ||
| − | + | LOCAL -4 | |
| + | LOAD ; read ix | ||
DUP | DUP | ||
INT 1 | INT 1 | ||
ADD | ADD | ||
| − | + | LOCAL -4 | |
| + | STORE ; ix = ix + 1 | ||
; trash old value of ix | ; trash old value of ix | ||
| Line 87: | Line 94: | ||
; prepare return value | ; prepare return value | ||
| − | + | LOCAL -4 | |
| + | LOAD ; read ix | ||
; put it in the accumulator (register) to conform with Cdecl | ; put it in the accumulator (register) to conform with Cdecl | ||
| Line 96: | Line 104: | ||
</asm> | </asm> | ||
| + | }} | ||
== Compiling and Running == | == Compiling and Running == | ||
Consider the following C function:
<c> extern int printf(const char *format, ...); int printlist(int lo, int hi) {
int ix = lo;
while (ix < hi) {
printf("%d\n", ix);
ix++;
}
return ix;
} </c>
The Postfix code for the above function is as follows:
| Postfix code |
|---|
| {{{2}}} |
To compile the Postfix code directly, pf2asm can be used: