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// Inferno utils/cc/bits.c
// http://code.google.com/p/inferno-os/source/browse/utils/cc/bits.c
//
// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
// Portions Copyright © 1997-1999 Vita Nuova Limited
// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
// Portions Copyright © 2004,2006 Bruce Ellis
// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
// Portions Copyright © 2009 The Go Authors. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#include <u.h>
#include <libc.h>
#include "go.h"
/*
Bits
bor(Bits a, Bits b)
{
Bits c;
int i;
for(i=0; i<BITS; i++)
c.b[i] = a.b[i] | b.b[i];
return c;
}
Bits
band(Bits a, Bits b)
{
Bits c;
int i;
for(i=0; i<BITS; i++)
c.b[i] = a.b[i] & b.b[i];
return c;
}
Bits
bnot(Bits a)
{
Bits c;
int i;
for(i=0; i<BITS; i++)
c.b[i] = ~a.b[i];
return c;
}
*/
int
bany(Bits *a)
{
int i;
for(i=0; i<BITS; i++)
if(a->b[i])
return 1;
return 0;
}
/*
int
beq(Bits a, Bits b)
{
int i;
for(i=0; i<BITS; i++)
if(a.b[i] != b.b[i])
return 0;
return 1;
}
*/
int
bnum(Bits a)
{
int i;
int32 b;
for(i=0; i<BITS; i++)
if(b = a.b[i])
return 32*i + bitno(b);
fatal("bad in bnum");
return 0;
}
Bits
blsh(uint n)
{
Bits c;
c = zbits;
c.b[n/32] = 1L << (n%32);
return c;
}
/*
int
bset(Bits a, uint n)
{
if(a.b[n/32] & (1L << (n%32)))
return 1;
return 0;
}
*/
int
bitno(int32 b)
{
int i;
for(i=0; i<32; i++)
if(b & (1L<<i))
return i;
fatal("bad in bitno");
return 0;
}
int
Qconv(Fmt *fp)
{
Bits bits;
int i, first;
first = 1;
bits = va_arg(fp->args, Bits);
while(bany(&bits)) {
i = bnum(bits);
if(first)
first = 0;
else
fmtprint(fp, " ");
if(var[i].node == N || var[i].node->sym == S)
fmtprint(fp, "$%d", i);
else {
fmtprint(fp, "%s", var[i].node->sym->name);
if(var[i].offset != 0)
fmtprint(fp, "%+lld", (vlong)var[i].offset);
}
bits.b[i/32] &= ~(1L << (i%32));
}
return 0;
}