mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-15 04:31:49 +08:00
303 lines
7.2 KiB
C
303 lines
7.2 KiB
C
/*
|
|
* Copyright (c) 1983 Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms are permitted
|
|
* provided that: (1) source distributions retain this entire copyright
|
|
* notice and comment, and (2) distributions including binaries display
|
|
* the following acknowledgement: ``This product includes software
|
|
* developed by the University of California, Berkeley and its contributors''
|
|
* in the documentation or other materials provided with the distribution
|
|
* and in all advertising materials mentioning features or use of this
|
|
* software. Neither the name of the University nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static char sccsid[] = "@(#)dfn.c 5.4 (Berkeley) 6/1/90";
|
|
#endif /* not lint */
|
|
|
|
#include <stdio.h>
|
|
#include "gprof.h"
|
|
|
|
#define DFN_DEPTH 100
|
|
struct dfnstruct {
|
|
nltype *nlentryp;
|
|
int cycletop;
|
|
};
|
|
typedef struct dfnstruct dfntype;
|
|
|
|
dfntype dfn_stack[ DFN_DEPTH ];
|
|
int dfn_depth = 0;
|
|
|
|
int dfn_counter = DFN_NAN;
|
|
|
|
/*
|
|
* given this parent, depth first number its children.
|
|
*/
|
|
dfn( parentp )
|
|
nltype *parentp;
|
|
{
|
|
arctype *arcp;
|
|
|
|
# ifdef DEBUG
|
|
if ( debug & DFNDEBUG ) {
|
|
printf( "[dfn] dfn(" );
|
|
printname( parentp );
|
|
printf( ")\n" );
|
|
}
|
|
# endif DEBUG
|
|
/*
|
|
* if we're already numbered, no need to look any furthur.
|
|
*/
|
|
if ( dfn_numbered( parentp ) ) {
|
|
return;
|
|
}
|
|
/*
|
|
* if we're already busy, must be a cycle
|
|
*/
|
|
if ( dfn_busy( parentp ) ) {
|
|
dfn_findcycle( parentp );
|
|
return;
|
|
}
|
|
/*
|
|
* visit yourself before your children
|
|
*/
|
|
dfn_pre_visit( parentp );
|
|
/*
|
|
* visit children
|
|
*/
|
|
for ( arcp = parentp -> children ; arcp ; arcp = arcp -> arc_childlist ) {
|
|
dfn( arcp -> arc_childp );
|
|
}
|
|
/*
|
|
* visit yourself after your children
|
|
*/
|
|
dfn_post_visit( parentp );
|
|
}
|
|
|
|
/*
|
|
* push a parent onto the stack and mark it busy
|
|
*/
|
|
dfn_pre_visit( parentp )
|
|
nltype *parentp;
|
|
{
|
|
|
|
dfn_depth += 1;
|
|
if ( dfn_depth >= DFN_DEPTH ) {
|
|
fprintf( stderr , "[dfn] out of my depth (dfn_stack overflow)\n" );
|
|
exit( 1 );
|
|
}
|
|
dfn_stack[ dfn_depth ].nlentryp = parentp;
|
|
dfn_stack[ dfn_depth ].cycletop = dfn_depth;
|
|
parentp -> toporder = DFN_BUSY;
|
|
# ifdef DEBUG
|
|
if ( debug & DFNDEBUG ) {
|
|
printf( "[dfn_pre_visit]\t\t%d:" , dfn_depth );
|
|
printname( parentp );
|
|
printf( "\n" );
|
|
}
|
|
# endif DEBUG
|
|
}
|
|
|
|
/*
|
|
* are we already numbered?
|
|
*/
|
|
bool
|
|
dfn_numbered( childp )
|
|
nltype *childp;
|
|
{
|
|
|
|
return ( childp -> toporder != DFN_NAN && childp -> toporder != DFN_BUSY );
|
|
}
|
|
|
|
/*
|
|
* are we already busy?
|
|
*/
|
|
bool
|
|
dfn_busy( childp )
|
|
nltype *childp;
|
|
{
|
|
|
|
if ( childp -> toporder == DFN_NAN ) {
|
|
return FALSE;
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
/*
|
|
* MISSING: an explanation
|
|
*/
|
|
dfn_findcycle( childp )
|
|
nltype *childp;
|
|
{
|
|
int cycletop;
|
|
nltype *cycleheadp;
|
|
nltype *tailp;
|
|
int index;
|
|
|
|
for ( cycletop = dfn_depth ; cycletop > 0 ; cycletop -= 1 ) {
|
|
cycleheadp = dfn_stack[ cycletop ].nlentryp;
|
|
if ( childp == cycleheadp ) {
|
|
break;
|
|
}
|
|
if ( childp -> cyclehead != childp &&
|
|
childp -> cyclehead == cycleheadp ) {
|
|
break;
|
|
}
|
|
}
|
|
if ( cycletop <= 0 ) {
|
|
fprintf( stderr , "[dfn_findcycle] couldn't find head of cycle\n" );
|
|
exit( 1 );
|
|
}
|
|
# ifdef DEBUG
|
|
if ( debug & DFNDEBUG ) {
|
|
printf( "[dfn_findcycle] dfn_depth %d cycletop %d " ,
|
|
dfn_depth , cycletop );
|
|
printname( cycleheadp );
|
|
printf( "\n" );
|
|
}
|
|
# endif DEBUG
|
|
if ( cycletop == dfn_depth ) {
|
|
/*
|
|
* this is previous function, e.g. this calls itself
|
|
* sort of boring
|
|
*/
|
|
dfn_self_cycle( childp );
|
|
} else {
|
|
/*
|
|
* glom intervening functions that aren't already
|
|
* glommed into this cycle.
|
|
* things have been glommed when their cyclehead field
|
|
* points to the head of the cycle they are glommed into.
|
|
*/
|
|
for ( tailp = cycleheadp ; tailp -> cnext ; tailp = tailp -> cnext ) {
|
|
/* void: chase down to tail of things already glommed */
|
|
# ifdef DEBUG
|
|
if ( debug & DFNDEBUG ) {
|
|
printf( "[dfn_findcycle] tail " );
|
|
printname( tailp );
|
|
printf( "\n" );
|
|
}
|
|
# endif DEBUG
|
|
}
|
|
/*
|
|
* if what we think is the top of the cycle
|
|
* has a cyclehead field, then it's not really the
|
|
* head of the cycle, which is really what we want
|
|
*/
|
|
if ( cycleheadp -> cyclehead != cycleheadp ) {
|
|
cycleheadp = cycleheadp -> cyclehead;
|
|
# ifdef DEBUG
|
|
if ( debug & DFNDEBUG ) {
|
|
printf( "[dfn_findcycle] new cyclehead " );
|
|
printname( cycleheadp );
|
|
printf( "\n" );
|
|
}
|
|
# endif DEBUG
|
|
}
|
|
for ( index = cycletop + 1 ; index <= dfn_depth ; index += 1 ) {
|
|
childp = dfn_stack[ index ].nlentryp;
|
|
if ( childp -> cyclehead == childp ) {
|
|
/*
|
|
* not yet glommed anywhere, glom it
|
|
* and fix any children it has glommed
|
|
*/
|
|
tailp -> cnext = childp;
|
|
childp -> cyclehead = cycleheadp;
|
|
# ifdef DEBUG
|
|
if ( debug & DFNDEBUG ) {
|
|
printf( "[dfn_findcycle] glomming " );
|
|
printname( childp );
|
|
printf( " onto " );
|
|
printname( cycleheadp );
|
|
printf( "\n" );
|
|
}
|
|
# endif DEBUG
|
|
for ( tailp = childp ; tailp->cnext ; tailp = tailp->cnext ) {
|
|
tailp -> cnext -> cyclehead = cycleheadp;
|
|
# ifdef DEBUG
|
|
if ( debug & DFNDEBUG ) {
|
|
printf( "[dfn_findcycle] and its tail " );
|
|
printname( tailp -> cnext );
|
|
printf( " onto " );
|
|
printname( cycleheadp );
|
|
printf( "\n" );
|
|
}
|
|
# endif DEBUG
|
|
}
|
|
} else if ( childp -> cyclehead != cycleheadp /* firewall */ ) {
|
|
fprintf( stderr ,
|
|
"[dfn_busy] glommed, but not to cyclehead\n" );
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* deal with self-cycles
|
|
* for lint: ARGSUSED
|
|
*/
|
|
dfn_self_cycle( parentp )
|
|
nltype *parentp;
|
|
{
|
|
/*
|
|
* since we are taking out self-cycles elsewhere
|
|
* no need for the special case, here.
|
|
*/
|
|
# ifdef DEBUG
|
|
if ( debug & DFNDEBUG ) {
|
|
printf( "[dfn_self_cycle] " );
|
|
printname( parentp );
|
|
printf( "\n" );
|
|
}
|
|
# endif DEBUG
|
|
}
|
|
|
|
/*
|
|
* visit a node after all its children
|
|
* [MISSING: an explanation]
|
|
* and pop it off the stack
|
|
*/
|
|
dfn_post_visit( parentp )
|
|
nltype *parentp;
|
|
{
|
|
nltype *memberp;
|
|
|
|
# ifdef DEBUG
|
|
if ( debug & DFNDEBUG ) {
|
|
printf( "[dfn_post_visit]\t%d: " , dfn_depth );
|
|
printname( parentp );
|
|
printf( "\n" );
|
|
}
|
|
# endif DEBUG
|
|
/*
|
|
* number functions and things in their cycles
|
|
* unless the function is itself part of a cycle
|
|
*/
|
|
if ( parentp -> cyclehead == parentp ) {
|
|
dfn_counter += 1;
|
|
for ( memberp = parentp ; memberp ; memberp = memberp -> cnext ) {
|
|
memberp -> toporder = dfn_counter;
|
|
# ifdef DEBUG
|
|
if ( debug & DFNDEBUG ) {
|
|
printf( "[dfn_post_visit]\t\tmember " );
|
|
printname( memberp );
|
|
printf( " -> toporder = %d\n" , dfn_counter );
|
|
}
|
|
# endif DEBUG
|
|
}
|
|
} else {
|
|
# ifdef DEBUG
|
|
if ( debug & DFNDEBUG ) {
|
|
printf( "[dfn_post_visit]\t\tis part of a cycle\n" );
|
|
}
|
|
# endif DEBUG
|
|
}
|
|
dfn_depth -= 1;
|
|
}
|