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aux/data2s: compress output

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encode printable characters litteraly, use D() macro to
reduce DATA instruction overhead.

this halves the time spend assembling $CONF.root.s for
the kernel build.
This commit is contained in:
cinap_lenrek 2017-01-07 20:36:13 +01:00
parent df6c190831
commit 28089ee035
1 changed files with 18 additions and 8 deletions
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26
sys/src/cmd/aux/data2s.c
View file

@ -7,7 +7,7 @@ main(int argc, char *argv[])
{
Biobuf bin, bout;
long len, slen;
int c;
int c, x;
if(argc != 2){
fprint(2, "usage: data2s name\n");
@ -15,15 +15,24 @@ main(int argc, char *argv[])
}
Binit(&bin, 0, OREAD);
Binit(&bout, 1, OWRITE);
Bprint(&bout, "#define D(o,s) DATA %scode+o(SB)/8, $s\n", argv[1]);
for(len=0; (c=Bgetc(&bin))!=Beof; len++){
if((len&7) == 0)
Bprint(&bout, "DATA %scode+%ld(SB)/8, $\"", argv[1], len);
if(c)
Bprint(&bout, "\\%uo", c);
else
Bprint(&bout, "\\z");
Bprint(&bout, "D(%ld,\"", len);
if(c>=0x20 && c<=0x7E){
if(c == '\\' || c == '"')
Bprint(&bout, "\\");
Bprint(&bout, "%c", c);
}else{
if((x=Bgetc(&bin))!=Beof)
Bungetc(&bin);
if(x>='0' && x<='7')
Bprint(&bout, "\\%.3uo", c);
else
Bprint(&bout, "\\%uo", c);
}
if((len&7) == 7)
Bprint(&bout, "\"\n");
Bprint(&bout, "\")\n");
}
slen = len;
if(len & 7){
@ -31,8 +40,9 @@ main(int argc, char *argv[])
Bprint(&bout, "\\z");
len++;
}
Bprint(&bout, "\"\n");
Bprint(&bout, "\")\n");
}
Bprint(&bout, "#undef D\n");
Bprint(&bout, "GLOBL %scode+0(SB), $%ld\n", argv[1], len);
Bprint(&bout, "GLOBL %slen+0(SB), $4\n", argv[1]);
Bprint(&bout, "DATA %slen+0(SB)/4, $%ld\n", argv[1], slen);