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Size of Arguments
- To: gnu-win32 at cygnus dot com
- Subject: Size of Arguments
- From: jeffdbREMOVETHIS at netzone dot com (Mikey)
- Date: Fri, 19 Sep 1997 00:01:27 GMT
- Organization: Never
- Reply-To: jeffdbREMOVETHIS at netzone dot com
Sorry, longs are 4 bytes just like ints (except on alpha ;^),
my point was that calling parameters are DWORD aligned on the stack
here is the actual code first the C, then the assembler.
Double, and Long Double are NOT the same.
#include <ctype.h>
#include <limits.h>
#include <math.h>
#include <float.h>
#include <stdio.h>
int main(){
unsigned char one = CHAR_MAX;
unsigned short two = SHRT_MAX;
unsigned int three = INT_MAX;
unsigned long four = LONG_MAX;
unsigned long long int five = LONG_LONG_MAX;
float six = FLT_MAX;
double seven = DBL_MAX;
long double eight = LDBL_MAX;
char *nine;
nine = &one;
printf("char %d, short %d, int %d, long %d, long long %d, float %d, double %d lo
ng double %d char_ptr %d\n", one, two, three, four, five, six, seven, eight, nin
e);
movb $127,-1(%ebp) u_char
.stabn 68,0,12,.LM3-_main
.LM3:
movw $32767,-4(%ebp) u_short
.stabn 68,0,13,.LM4-_main
.LM4:
movl $2147483647,-8(%ebp) u_int
.stabn 68,0,14,.LM5-_main
.LM5:
movl $2147483647,-12(%ebp) u_long
.stabn 68,0,15,.LM6-_main
.LM6:
movl $-1,-20(%ebp)
movl $2147483647,-16(%ebp) u_long_long (int64)
.stabn 68,0,16,.LM7-_main
.LM7:
movl $2139095039,-24(%ebp) float
.stabn 68,0,17,.LM8-_main
.LM8:
movl $-1,-32(%ebp)
movl $2146435071,-28(%ebp) double
.stabn 68,0,18,.LM9-_main
.LM9:
movl $-2132,-44(%ebp)
movl $-1,-40(%ebp)
movl $17406,-36(%ebp) long double
.stabn 68,0,20,.LM10-_main
.LM10:
leal -1(%ebp),%edx
movl %edx,-48(%ebp) pointer_to_char
.stabn 68,0,22,.LM11-_main
.LM11:
movl -48(%ebp),%eax
pushl %eax
<<<<<< pointer above 4
pushl -36(%ebp)
pushl -40(%ebp)
pushl -44(%ebp)
<<<<<< long double above 12
pushl -28(%ebp)
pushl -32(%ebp)
<<<<<< double above 8
flds -24(%ebp)
subl $8,%esp
fstpl (%esp)
<<<<<< float above passed in 387 reg 8 on stack
pushl -16(%ebp)
pushl -20(%ebp)
<<<<<< long long above 8
movl -12(%ebp),%eax
pushl %eax
<<<<<< long above 4
movl -8(%ebp),%eax
pushl %eax
<<<<<< int above 4
movzwl -4(%ebp),%eax
pushl %eax
<<<<<< short above 4
movzbl -1(%ebp),%eax
pushl %eax
<<<<<< char above 4
pushl $LC0
call _printf
addl $60,%esp
(jeffdbREMOVETHIS@netzone.com)
delete REMOVETHIS from the above to reply
Mikey
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