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/* $OpenBSD: inline.c,v 1.2 2008/01/12 17:26:16 ragge Exp $ */
/*
* Copyright (c) 2003 Anders Magnusson (ragge@ludd.luth.se).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "pass1.h"
#include <stdarg.h>
/*
* ilink from ipole points to the next struct in the list of functions.
*/
static struct istat {
struct istat *ilink;
struct symtab *sp;
int type;
#define NOTYETR 0 /* saved but not yet referenced */
#define NOTYETW 1 /* saved and referenced but not yet written out */
#define WRITTEN 2 /* is written out */
#define NOTYETD 3 /* referenced but not yet saved */
struct interpass shead;
} *ipole, *cifun;
#define IP_REF (MAXIP+1)
int isinlining, recovernodes;
int inlnodecnt, inlstatcnt;
#define ialloc() permalloc(sizeof(struct istat)); inlstatcnt++
#define nalloc() permalloc(sizeof(NODE))
static void
tcnt(NODE *p)
{
inlnodecnt++;
}
static struct istat *
findfun(struct symtab *sp)
{
struct istat *is = ipole;
while (is) {
if (is->sp == sp)
return is;
is = is->ilink;
}
return NULL;
}
static void
refnode(struct symtab *sp)
{
struct interpass *ip;
if (sdebug)
printf("refnode(%s)\n", sp->sname);
ip = permalloc(sizeof(*ip));
ip->type = IP_REF;
ip->ip_name = (char *)sp;
inline_addarg(ip);
}
void
inline_addarg(struct interpass *ip)
{
DLIST_INSERT_BEFORE(&cifun->shead, ip, qelem);
if (ip->type == IP_NODE)
walkf(ip->ip_node, tcnt); /* Count as saved */
}
/*
* Called to setup for inlining of a new function.
*/
void
inline_start(struct symtab *sp)
{
struct istat *is;
if (sdebug)
printf("inline_start(\"%s\")\n", sp->sname);
if (isinlining)
cerror("already inlining function");
if ((is = findfun(sp)) == 0) {
is = ialloc();
is->ilink = ipole;
ipole = is;
is->sp = sp;
is->type = NOTYETR;
} else {
if (is->type != NOTYETD)
cerror("inline function already defined");
is->type = NOTYETW;
}
DLIST_INIT(&is->shead, qelem);
cifun = is;
isinlining++;
}
void
inline_end()
{
if (sdebug)
printf("inline_end()\n");
isinlining = 0;
}
/*
* Called when an inline function is found, to be sure that it will
* be written out.
* The function may not be defined when inline_ref() is called.
*/
void
inline_ref(struct symtab *sp)
{
struct istat *w = ipole;
if (sdebug)
printf("inline_ref(\"%s\")\n", sp->sname);
if (isinlining) {
refnode(sp);
} else {
while (w != NULL) {
if (w->sp == sp) {
if (w->type == NOTYETR)
w->type = NOTYETW;
return; /* setup for writeout */
}
w = w->ilink;
}
/* function not yet defined, print out when found */
w = ialloc();
w->ilink = ipole;
ipole = w;
w->sp = sp;
w->type = NOTYETD;
}
}
static void
puto(struct istat *w)
{
struct interpass *ip, *nip;
/* if -O, list will be saved again so foreach cannot be used */
ip = DLIST_NEXT(&w->shead, qelem);
while (ip != (&w->shead)) {
nip = DLIST_NEXT(ip, qelem);
DLIST_REMOVE(ip, qelem);
if (ip->type == IP_REF)
inline_ref((struct symtab *)ip->ip_name);
else
pass2_compile(ip);
ip = nip;
}
DLIST_INIT(&w->shead, qelem);
}
/*
* printout functions that are referenced.
*/
void
inline_prtout()
{
struct istat *w = ipole;
int gotone = 0;
if (w == NULL)
return;
recovernodes++;
while (w != NULL) {
if (w->type == NOTYETW) {
defloc(w->sp);
puto(w);
w->type = WRITTEN;
gotone++;
}
w = w->ilink;
}
if (gotone)
inline_prtout();
recovernodes--;
}
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