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/*
* cook - file construction tool
* Copyright (C) 1997 Peter Miller;
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
*
* MANIFEST: functions to manipulate labels
*/
#include <mem.h>
#include <opcode/label.h>
#include <trace.h>
/*
* NAME
* opcode_label_new
*
* SYNOPSIS
* opcode_label_ty *opcode_label_new(void);
*
* DESCRIPTION
* The opcode_label_new function is used to allocate a new label
* instance in dynamic memory, and initialize it in preparation for
* use.
*
* CAVEAT
* Use opcode_label_delete when you are done with it.
*/
opcode_label_ty *
opcode_label_new()
{
opcode_label_ty *lp;
trace(("opcode_label_new()\n{\n"/*}*/));
lp = mem_alloc(sizeof(opcode_label_ty));
lp->pc = (size_t)(-1);
lp->npending = 0;
lp->npending_max = 0;
lp->pending = 0;
trace(("return %08lX;\n", (long)lp));
trace((/*{*/"}\n"));
return lp;
}
/*
* NAME
* opcode_label_delete
*
* SYNOPSIS
* void opcode_label_delete(opcode_label_ty *);
*
* DESCRIPTION
* The opcode_label_delete function is used to release the
* resources held by an opcode structure.
*/
void
opcode_label_delete(lp)
opcode_label_ty *lp;
{
trace(("opcode_label_delete(lp = %08lX)\n{\n"/*}*/, (long)lp));
if (lp->pending)
mem_free(lp->pending);
lp->pc = (size_t)(-1);
lp->npending = 0;
lp->npending_max = 0;
lp->pending = 0;
mem_free(lp);
trace((/*{*/"}\n"));
}
/*
* NAME
* opcode_label_define
*
* SYNOPSIS
* void opcode_label_define(opcode_label_ty *, size_t);
*
* DESCRIPTION
* The opcode_label_define function is used to specify the location
* of a label. Outstanding references will be resolved, future
* references will be set accordingly.
*
* CAVEAT
* Should be called exactly once per label.
*/
void
opcode_label_define(lp, where)
opcode_label_ty *lp;
size_t where;
{
size_t j;
trace(("opcode_label_define(lp = %08lX)\n{\n"/*}*/, (long)lp));
assert(lp->pc == (size_t)(-1));
lp->pc = where;
trace(("pc = %ld\n", (long)lp->pc));
for (j = 0; j < lp->npending; ++j)
*lp->pending[j] = lp->pc;
if (lp->pending)
mem_free(lp->pending);
lp->npending = 0;
lp->npending_max = 0;
lp->pending = 0;
trace((/*{*/"}\n"));
}
/*
* NAME
* opcode_label_refer
*
* SYNOPSIS
* void opcode_label_refer(void);
*
* DESCRIPTION
* The opcode_label_refer function is used to refer to a label. If
* the label is not yet defined, references will eb accumulated and
* resolved after the definition.
*
* CAVEAT
* The opcodes in which the labels are used are expected to remain
* in existence until the label is defined.
*/
void
opcode_label_refer(lp, where)
opcode_label_ty *lp;
size_t *where;
{
trace(("opcode_label_refer(lp = %08lX)\n{\n"/*}*/, (long)lp));
*where = (size_t)(-1);
if (lp->pc == (size_t)(-1))
{
if (lp->npending >= lp->npending_max)
{
size_t nbytes;
lp->npending_max = lp->npending_max * 2 + 4;
nbytes = lp->npending_max * sizeof(lp->pending[0]);
lp->pending = mem_change_size(lp->pending, nbytes);
}
lp->pending[lp->npending++] = where;
}
else
*where = lp->pc;
trace((/*{*/"}\n"));
}
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