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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/gprof/dfn.c	Lines:	0	50	0.0 %
Date:	2016-12-06	Branches:	0	40	0.0 %


/*	$OpenBSD: dfn.c,v 1.8 2014/03/16 18:38:30 guenther Exp $	*/
/*	$NetBSD: dfn.c,v 1.5 1995/04/19 07:15:56 cgd Exp $	*/

/*
 * Copyright (c) 1983, 1993
 *	The Regents of the University of California.  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. 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 BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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 <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;

int	dfn_counter;

void
dfn_init()
{

    dfn_depth = 0;
    dfn_counter = DFN_NAN;
}

    /*
     *	given this parent, depth first number its children.
     */
void
dfn(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 ) {
	    if ( arcp -> arc_flags & DEADARC )
		continue;
	    dfn( arcp -> arc_childp );
    }
	/*
	 *	visit yourself after your children
	 */
    dfn_post_visit( parentp );
}

    /*
     *	push a parent onto the stack and mark it busy
     */
void
dfn_pre_visit(nltype *parentp)
{

    dfn_depth += 1;
    if ( dfn_depth >= DFN_DEPTH )
	errx(1, "[dfn] out of my depth (dfn_stack overflow)" );
    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(nltype *childp)
{

    return ( childp -> toporder != DFN_NAN && childp -> toporder != DFN_BUSY );
}

    /*
     *	are we already busy?
     */
bool
dfn_busy(nltype *childp)
{

    if ( childp -> toporder == DFN_NAN ) {
	return FALSE;
    }
    return TRUE;
}

    /*
     *	MISSING: an explanation
     */
void
dfn_findcycle(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 )
	errx( 1, "[dfn_findcycle] couldn't find head of cycle");
#   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 */ )
		warnx("[dfn_busy] glommed, but not to cyclehead");
	}
    }
}

    /*
     *	deal with self-cycles
     */
void
dfn_self_cycle(nltype *parentp __unused)
{
	/*
	 *	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
     */
void
dfn_post_visit(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;
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: dfn.c,v 1.8 2014/03/16 18:38:30 guenther Exp $ */
2			/* $NetBSD: dfn.c,v 1.5 1995/04/19 07:15:56 cgd Exp $ */
3
4			/*
5			* Copyright (c) 1983, 1993
6			* The Regents of the University of California. All rights reserved.
7			*
8			* Redistribution and use in source and binary forms, with or without
9			* modification, are permitted provided that the following conditions
10			* are met:
11			* 1. Redistributions of source code must retain the above copyright
12			* notice, this list of conditions and the following disclaimer.
13			* 2. Redistributions in binary form must reproduce the above copyright
14			* notice, this list of conditions and the following disclaimer in the
15			* documentation and/or other materials provided with the distribution.
16			* 3. Neither the name of the University nor the names of its contributors
17			* may be used to endorse or promote products derived from this software
18			* without specific prior written permission.
19			*
20			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23			* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30			* SUCH DAMAGE.
31			*/
32
33			#include <stdio.h>
34			#include "gprof.h"
35
36			#define DFN_DEPTH 100
37			struct dfnstruct {
38			nltype *nlentryp;
39			int cycletop;
40			};
41			typedef struct dfnstruct dfntype;
42
43			dfntype dfn_stack[ DFN_DEPTH ];
44			int dfn_depth;
45
46			int dfn_counter;
47
48			void
49			dfn_init()
50			{
51
52			dfn_depth = 0;
53			dfn_counter = DFN_NAN;
54			}
55
56			/*
57			* given this parent, depth first number its children.
58			*/
59			void
60			dfn(nltype *parentp)
61			{
62			arctype *arcp;
63
64			# ifdef DEBUG
65			if ( debug & DFNDEBUG ) {
66			printf( "[dfn] dfn(" );
67			printname( parentp );
68			printf( ")\n" );
69			}
70			# endif /* DEBUG */
71			/*
72			* if we're already numbered, no need to look any furthur.
73			*/
74			if ( dfn_numbered( parentp ) ) {
75			return;
76			}
77			/*
78			* if we're already busy, must be a cycle
79			*/
80			if ( dfn_busy( parentp ) ) {
81			dfn_findcycle( parentp );
82			return;
83			}
84			/*
85			* visit yourself before your children
86			*/
87			dfn_pre_visit( parentp );
88			/*
89			* visit children
90			*/
91			for ( arcp = parentp -> children ; arcp ; arcp = arcp -> arc_childlist ) {
92			if ( arcp -> arc_flags & DEADARC )
93			continue;
94			dfn( arcp -> arc_childp );
95			}
96			/*
97			* visit yourself after your children
98			*/
99			dfn_post_visit( parentp );
100			}
101
102			/*
103			* push a parent onto the stack and mark it busy
104			*/
105			void
106			dfn_pre_visit(nltype *parentp)
107			{
108
109			dfn_depth += 1;
110			if ( dfn_depth >= DFN_DEPTH )
111			errx(1, "[dfn] out of my depth (dfn_stack overflow)" );
112			dfn_stack[ dfn_depth ].nlentryp = parentp;
113			dfn_stack[ dfn_depth ].cycletop = dfn_depth;
114			parentp -> toporder = DFN_BUSY;
115			# ifdef DEBUG
116			if ( debug & DFNDEBUG ) {
117			printf( "[dfn_pre_visit]\t\t%d:" , dfn_depth );
118			printname( parentp );
119			printf( "\n" );
120			}
121			# endif /* DEBUG */
122			}
123
124			/*
125			* are we already numbered?
126			*/
127			bool
128			dfn_numbered(nltype *childp)
129			{
130
131			return ( childp -> toporder != DFN_NAN && childp -> toporder != DFN_BUSY );
132			}
133
134			/*
135			* are we already busy?
136			*/
137			bool
138			dfn_busy(nltype *childp)
139			{
140
141			if ( childp -> toporder == DFN_NAN ) {
142			return FALSE;
143			}
144			return TRUE;
145			}
146
147			/*
148			* MISSING: an explanation
149			*/
150			void
151			dfn_findcycle(nltype *childp)
152			{
153			int cycletop;
154			nltype *cycleheadp;
155			nltype *tailp;
156			int index;
157
158			for ( cycletop = dfn_depth ; cycletop > 0 ; cycletop -= 1 ) {
159			cycleheadp = dfn_stack[ cycletop ].nlentryp;
160			if ( childp == cycleheadp ) {
161			break;
162			}
163			if ( childp -> cyclehead != childp &&
164			childp -> cyclehead == cycleheadp ) {
165			break;
166			}
167			}
168			if ( cycletop <= 0 )
169			errx( 1, "[dfn_findcycle] couldn't find head of cycle");
170			# ifdef DEBUG
171			if ( debug & DFNDEBUG ) {
172			printf( "[dfn_findcycle] dfn_depth %d cycletop %d " ,
173			dfn_depth , cycletop );
174			printname( cycleheadp );
175			printf( "\n" );
176			}
177			# endif /* DEBUG */
178			if ( cycletop == dfn_depth ) {
179			/*
180			* this is previous function, e.g. this calls itself
181			* sort of boring
182			*/
183			dfn_self_cycle( childp );
184			} else {
185			/*
186			* glom intervening functions that aren't already
187			* glommed into this cycle.
188			* things have been glommed when their cyclehead field
189			* points to the head of the cycle they are glommed into.
190			*/
191			for ( tailp = cycleheadp ; tailp -> cnext ; tailp = tailp -> cnext ) {
192			/* void: chase down to tail of things already glommed */
193			# ifdef DEBUG
194			if ( debug & DFNDEBUG ) {
195			printf( "[dfn_findcycle] tail " );
196			printname( tailp );
197			printf( "\n" );
198			}
199			# endif /* DEBUG */
200			}
201			/*
202			* if what we think is the top of the cycle
203			* has a cyclehead field, then it's not really the
204			* head of the cycle, which is really what we want
205			*/
206			if ( cycleheadp -> cyclehead != cycleheadp ) {
207			cycleheadp = cycleheadp -> cyclehead;
208			# ifdef DEBUG
209			if ( debug & DFNDEBUG ) {
210			printf( "[dfn_findcycle] new cyclehead " );
211			printname( cycleheadp );
212			printf( "\n" );
213			}
214			# endif /* DEBUG */
215			}
216			for ( index = cycletop + 1 ; index <= dfn_depth ; index += 1 ) {
217			childp = dfn_stack[ index ].nlentryp;
218			if ( childp -> cyclehead == childp ) {
219			/*
220			* not yet glommed anywhere, glom it
221			* and fix any children it has glommed
222			*/
223			tailp -> cnext = childp;
224			childp -> cyclehead = cycleheadp;
225			# ifdef DEBUG
226			if ( debug & DFNDEBUG ) {
227			printf( "[dfn_findcycle] glomming " );
228			printname( childp );
229			printf( " onto " );
230			printname( cycleheadp );
231			printf( "\n" );
232			}
233			# endif /* DEBUG */
234			for ( tailp = childp ; tailp->cnext ; tailp = tailp->cnext ) {
235			tailp -> cnext -> cyclehead = cycleheadp;
236			# ifdef DEBUG
237			if ( debug & DFNDEBUG ) {
238			printf( "[dfn_findcycle] and its tail " );
239			printname( tailp -> cnext );
240			printf( " onto " );
241			printname( cycleheadp );
242			printf( "\n" );
243			}
244			# endif /* DEBUG */
245			}
246			} else if ( childp -> cyclehead != cycleheadp /* firewall */ )
247			warnx("[dfn_busy] glommed, but not to cyclehead");
248			}
249			}
250			}
251
252			/*
253			* deal with self-cycles
254			*/
255			void
256			dfn_self_cycle(nltype *parentp __unused)
257			{
258			/*
259			* since we are taking out self-cycles elsewhere
260			* no need for the special case, here.
261			*/
262			# ifdef DEBUG
263			if ( debug & DFNDEBUG ) {
264			printf( "[dfn_self_cycle] " );
265			printname( parentp );
266			printf( "\n" );
267			}
268			# endif /* DEBUG */
269			}
270
271			/*
272			* visit a node after all its children
273			* [MISSING: an explanation]
274			* and pop it off the stack
275			*/
276			void
277			dfn_post_visit(nltype *parentp)
278			{
279			nltype *memberp;
280
281			# ifdef DEBUG
282			if ( debug & DFNDEBUG ) {
283			printf( "[dfn_post_visit]\t%d: " , dfn_depth );
284			printname( parentp );
285			printf( "\n" );
286			}
287			# endif /* DEBUG */
288			/*
289			* number functions and things in their cycles
290			* unless the function is itself part of a cycle
291			*/
292			if ( parentp -> cyclehead == parentp ) {
293			dfn_counter += 1;
294			for ( memberp = parentp ; memberp ; memberp = memberp -> cnext ) {
295			memberp -> toporder = dfn_counter;
296			# ifdef DEBUG
297			if ( debug & DFNDEBUG ) {
298			printf( "[dfn_post_visit]\t\tmember " );
299			printname( memberp );
300			printf( " -> toporder = %d\n" , dfn_counter );
301			}
302			# endif /* DEBUG */
303			}
304			} else {
305			# ifdef DEBUG
306			if ( debug & DFNDEBUG ) {
307			printf( "[dfn_post_visit]\t\tis part of a cycle\n" );
308			}
309			# endif /* DEBUG */
310			}
311			dfn_depth -= 1;
312			}