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39995 (from 39977): Optimise string parameter assignment.

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If setter is the standard one and string length is unchnaged we can
copy into place.
This commit is contained in:
Peter Stephenson 2016-11-20 19:41:52 +00:00
parent a2426747da
commit 368884a3aa
3 changed files with 174 additions and 8 deletions
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3
ChangeLog
View file

@ -1,5 +1,8 @@
2016-11-20 Peter Stephenson <p.w.stephenson@ntlworld.com>
* 39995 (from 39977): Src/params.c, Test/A06assign.ztst:
optimisation of string assignment if length is unchanged.
* Mikel Ward: 39978: Doc/Zsh/jobs.yo: more accurate
documentation of searching for job by string.

29
Src/params.c
View file

@ -2436,9 +2436,10 @@ assignstrvalue(Value v, char *val, int flags)
v->pm->width = strlen(val);
} else {
char *z, *x;
int zlen;
int zlen, vlen, newsize;
z = dupstring_glen(v->pm->gsu.s->getfn(v->pm), (unsigned*) &zlen);
z = v->pm->gsu.s->getfn(v->pm);
zlen = strlen(z);
if ((v->flags & VALFLAG_INV) && unset(KSHARRAYS))
v->start--, v->end--;
@ -2469,11 +2470,33 @@ assignstrvalue(Value v, char *val, int flags)
}
else if (v->end > zlen)
v->end = zlen;
x = (char *) zalloc(v->start + strlen(val) + zlen - v->end + 1);
vlen = strlen(val);
/* Characters preceding start index +
characters of what is assigned +
characters following end index */
newsize = v->start + vlen + (zlen - v->end);
/* Does new size differ? */
if (newsize != zlen || v->pm->gsu.s->setfn != strsetfn) {
x = (char *) zalloc(newsize + 1);
strncpy(x, z, v->start);
strcpy(x + v->start, val);
strcat(x + v->start, z + v->end);
v->pm->gsu.s->setfn(v->pm, x);
} else {
Param pm = v->pm;
/* Size doesn't change, can limit actions to only
* overwriting bytes in already allocated string */
strncpy(z + v->start, val, vlen);
/* Implement remainder of strsetfn */
if (!(pm->node.flags & PM_HASHELEM) &&
((pm->node.flags & PM_NAMEDDIR) ||
isset(AUTONAMEDIRS))) {
pm->node.flags |= PM_NAMEDDIR;
adduserdir(pm->node.nam, z, 0, 0);
}
}
zsfree(val);
}
break;

140
Test/A06assign.ztst
View file

@ -489,3 +489,143 @@
print $array
0:slice beyond length of array
>FIRST
# tests of string assignments
a="abc"
a[1]=x
print $a
0:overwrite first character in string
>xbc
a="abc"
a[2]="x"
print $a
0:overwrite middle character in string
>axc
a="abc"
a[3]="x"
print $a
0:overwrite last character in string
>abx
a="abc"
a[-1]="x"
print $a
0:overwrite -1 character in string
>abx
a="abc"
a[-2]="x"
print $a
0:overwrite -2 character (middle) in string
>axc
a="ab"
a[-2]="x"
print $a
0:overwrite -2 character (first) in string
>xb
a="abc"
a[-3]="x"
print $a
0:overwrite -3 character (first) in string
>xbc
a="abc"
a[-4]="x"
print $a
0:overwrite -4 character (before first) in string
>xabc
a="abc"
a[-5]="x"
print $a
0:overwrite -5 character (before-before first) in string
>xabc
a="abc"
a[-4,0]="x"
print $a
0:overwrite [-4,0] characters (before first) in string
>xabc
a="abc"
a[-4,-4]="x"
print $a
0:overwrite [-4,-4] character (before first) in string
>xabc
a="abc"
a[-40,-30]="x"
print $a
0:overwrite [-40,-30] characters (far before first) in string
>xabc
a="abc"
a[-40,1]="x"
print $a
0:overwrite [-40,1] characters in short string
>xbc
a="abc"
a[-40,40]="x"
print $a
0:overwrite [-40,40] characters in short string
>x
a="abc"
a[2,40]="x"
print $a
0:overwrite [2,40] characters in short string
>ax
a="abc"
a[2,-1]="x"
print $a
0:overwrite [2,-1] characters in short string
>ax
a="abc"
a[-2,-1]="x"
print $a
0:overwrite [-2,-1] characters in short string
>ax
a="a"
a[-1]="xx"
print $a
0:overwrite [-1] character with "xx"
>xx
a="a"
a[-2]="xx"
print $a
0:overwrite [-2] character (before first) with "xx"
>xxa
a="a"
a[2]="xx"
print $a
0:overwrite [2] character (after last) with "xx"
>axx
a=""
a[1]="xx"
print $a
0:overwrite [1] character (string: "") with "xx"
>xx
a=""
a[-1]="xx"
print $a
0:overwrite [-1] character (string: "") with "xx"
>xx
a=""
a[2]="xx"
print $a
0:overwrite [2] character (string: "") with "xx"
>xx