File: [local] / src / usr.bin / make / make.c (download)
Revision 1.24, Fri Nov 24 14:36:34 2000 UTC (23 years, 6 months ago) by espie
Branch: MAIN
CVS Tags: OPENBSD_2_9_BASE, OPENBSD_2_9
Changes since 1.23: +14 -16 lines
Change the time stamp interface to use an abstract datatype.
Define two possible interfaces: the classic one,
and the new one (used where available) that depends on timespec.
Better granularity, make is now able to distinguish between files that
were built during the same second.
|
/* $OpenBSD: make.c,v 1.24 2000/11/24 14:36:34 espie Exp $ */
/* $NetBSD: make.c,v 1.10 1996/11/06 17:59:15 christos Exp $ */
/*
* Copyright (c) 1988, 1989, 1990, 1993
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1989 by Berkeley Softworks
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Adam de Boor.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
/*-
* make.c --
* The functions which perform the examination of targets and
* their suitability for creation
*
* Interface:
* Make_Run Initialize things for the module and recreate
* whatever needs recreating. Returns TRUE if
* work was (or would have been) done and FALSE
* otherwise.
*
* Make_Update Update all parents of a given child. Performs
* various bookkeeping chores like the updating
* of the cmtime field of the parent, filling
* of the IMPSRC context variable, etc. It will
* place the parent on the toBeMade queue if it
* should be.
*
* Make_TimeStamp Function to set the parent's cmtime field
* based on a child's modification time.
*
* Make_DoAllVar Set up the various local variables for a
* target, including the .ALLSRC variable, making
* sure that any variable that needs to exist
* at the very least has the empty value.
*
* Make_OODate Determine if a target is out-of-date.
*
* Make_HandleUse See if a child is a .USE node for a parent
* and perform the .USE actions if so.
*/
#include <stddef.h>
#include "make.h"
#include "ohash.h"
#include "dir.h"
#include "job.h"
#ifndef lint
#if 0
static char sccsid[] = "@(#)make.c 8.1 (Berkeley) 6/6/93";
#else
UNUSED
static char rcsid[] = "$OpenBSD: make.c,v 1.24 2000/11/24 14:36:34 espie Exp $";
#endif
#endif /* not lint */
static LIST toBeMade; /* The current fringe of the graph. These
* are nodes which await examination by
* MakeOODate. It is added to by
* Make_Update and subtracted from by
* MakeStartJobs */
static int numNodes; /* Number of nodes to be processed. If this
* is non-zero when Job_Empty() returns
* TRUE, there's a cycle in the graph */
static void MakeAddChild __P((void *, void *));
static void MakeAddAllSrc __P((void *, void *));
static void MakeTimeStamp __P((void *, void *));
static void MakeHandleUse __P((void *, void *));
static Boolean MakeStartJobs __P((void));
static void MakePrintStatus __P((void *, void *));
/*-
*-----------------------------------------------------------------------
* Make_TimeStamp --
* Set the cmtime field of a parent node based on the mtime stamp in its
* child. Called from MakeOODate via Lst_ForEach.
*
* Side Effects:
* The cmtime of the parent node will be changed if the mtime
* field of the child is greater than it.
*-----------------------------------------------------------------------
*/
void
Make_TimeStamp(pgn, cgn)
GNode *pgn; /* the current parent */
GNode *cgn; /* the child we've just examined */
{
if (is_before(pgn->cmtime, cgn->mtime))
pgn->cmtime = cgn->mtime;
}
/* Wrapper to call Make_TimeStamp from a forEach loop */
static void
MakeTimeStamp(pgn, cgn)
void *pgn; /* the current parent */
void *cgn; /* the child we've just examined */
{
Make_TimeStamp((GNode *)pgn, (GNode *)cgn);
}
/*-
*-----------------------------------------------------------------------
* Make_OODate --
* See if a given node is out of date with respect to its sources.
* Used by Make_Run when deciding which nodes to place on the
* toBeMade queue initially and by Make_Update to screen out USE and
* EXEC nodes. In the latter case, however, any other sort of node
* must be considered out-of-date since at least one of its children
* will have been recreated.
*
* Results:
* TRUE if the node is out of date. FALSE otherwise.
*
* Side Effects:
* The mtime field of the node and the cmtime field of its parents
* will/may be changed.
*-----------------------------------------------------------------------
*/
Boolean
Make_OODate (gn)
register GNode *gn; /* the node to check */
{
Boolean oodate;
/*
* Certain types of targets needn't even be sought as their datedness
* doesn't depend on their modification time...
*/
if ((gn->type & (OP_JOIN|OP_USE|OP_EXEC)) == 0) {
(void)Dir_MTime(gn);
if (DEBUG(MAKE)) {
if (!is_out_of_date(gn->mtime)) {
printf ("modified %s...", Targ_FmtTime(gn->mtime));
} else {
printf ("non-existent...");
}
}
}
/*
* A target is remade in one of the following circumstances:
* its modification time is smaller than that of its youngest child
* and it would actually be run (has commands or type OP_NOP)
* it's the object of a force operator
* it has no children, was on the lhs of an operator and doesn't exist
* already.
*
* Libraries are only considered out-of-date if the archive module says
* they are.
*
* These weird rules are brought to you by Backward-Compatability and
* the strange people who wrote 'Make'.
*/
if (gn->type & OP_USE) {
/*
* If the node is a USE node it is *never* out of date
* no matter *what*.
*/
if (DEBUG(MAKE)) {
printf(".USE node...");
}
oodate = FALSE;
} else if ((gn->type & OP_LIB) && Arch_IsLib(gn)) {
if (DEBUG(MAKE)) {
printf("library...");
}
/*
* always out of date if no children and :: target
*/
oodate = Arch_LibOODate (gn) ||
(is_out_of_date(gn->cmtime) && (gn->type & OP_DOUBLEDEP));
} else if (gn->type & OP_JOIN) {
/*
* A target with the .JOIN attribute is only considered
* out-of-date if any of its children was out-of-date.
*/
if (DEBUG(MAKE)) {
printf(".JOIN node...");
}
oodate = gn->childMade;
} else if (gn->type & (OP_FORCE|OP_EXEC|OP_PHONY)) {
/*
* A node which is the object of the force (!) operator or which has
* the .EXEC attribute is always considered out-of-date.
*/
if (DEBUG(MAKE)) {
if (gn->type & OP_FORCE) {
printf("! operator...");
} else if (gn->type & OP_PHONY) {
printf(".PHONY node...");
} else {
printf(".EXEC node...");
}
}
oodate = TRUE;
} else if (is_before(gn->mtime, gn->cmtime) ||
(is_out_of_date(gn->cmtime) &&
(is_out_of_date(gn->mtime) || (gn->type & OP_DOUBLEDEP))))
{
/*
* A node whose modification time is less than that of its
* youngest child or that has no children (cmtime == OUT_OF_DATE) and
* either doesn't exist (mtime == OUT_OF_DATE) or was the object of a
* :: operator is out-of-date. Why? Because that's the way Make does
* it.
*/
if (DEBUG(MAKE)) {
if (is_before(gn->mtime, gn->cmtime)) {
printf("modified before source...");
} else if (is_out_of_date(gn->mtime)) {
printf("non-existent and no sources...");
} else {
printf(":: operator and no sources...");
}
}
oodate = TRUE;
} else {
#if 0
/* WHY? */
if (DEBUG(MAKE)) {
printf("source %smade...", gn->childMade ? "" : "not ");
}
oodate = gn->childMade;
#else
oodate = FALSE;
#endif /* 0 */
}
/*
* If the target isn't out-of-date, the parents need to know its
* modification time. Note that targets that appear to be out-of-date
* but aren't, because they have no commands and aren't of type OP_NOP,
* have their mtime stay below their children's mtime to keep parents from
* thinking they're out-of-date.
*/
if (!oodate)
Lst_ForEach(&gn->parents, MakeTimeStamp, gn);
return (oodate);
}
/*-
*-----------------------------------------------------------------------
* MakeAddChild --
* Function used by Make_Run to add a child to the list l.
* It will only add the child if its make field is FALSE.
*
* Side Effects:
* The given list is extended
*-----------------------------------------------------------------------
*/
static void
MakeAddChild(gnp, lp)
void *gnp; /* the node to add */
void *lp; /* the list to which to add it */
{
GNode *gn = (GNode *)gnp;
Lst l = (Lst)lp;
if (!gn->make && !(gn->type & OP_USE))
Lst_EnQueue(l, gn);
}
/*-
*-----------------------------------------------------------------------
* Make_HandleUse --
* Function called by Make_Run and SuffApplyTransform on the downward
* pass to handle .USE and transformation nodes. A callback function
* for Lst_ForEach, it implements the .USE and transformation
* functionality by copying the node's commands, type flags
* and children to the parent node. Should be called before the
* children are enqueued to be looked at by MakeAddChild.
*
* A .USE node is much like an explicit transformation rule, except
* its commands are always added to the target node, even if the
* target already has commands.
*
* Side Effects:
* Children and commands may be added to the parent and the parent's
* type may be changed.
*
*-----------------------------------------------------------------------
*/
void
Make_HandleUse(cgn, pgn)
GNode *cgn; /* The .USE node */
GNode *pgn; /* The target of the .USE node */
{
GNode *gn; /* A child of the .USE node */
LstNode ln; /* An element in the children list */
if (cgn->type & (OP_USE|OP_TRANSFORM)) {
if ((cgn->type & OP_USE) || Lst_IsEmpty(&pgn->commands)) {
/*
* .USE or transformation and target has no commands -- append
* the child's commands to the parent.
*/
Lst_Concat(&pgn->commands, &cgn->commands);
}
Lst_Open(&cgn->children);
while ((ln = Lst_Next(&cgn->children)) != NULL) {
gn = (GNode *)Lst_Datum(ln);
if (Lst_Member(&pgn->children, gn) == NULL) {
Lst_AtEnd(&pgn->children, gn);
Lst_AtEnd(&gn->parents, pgn);
pgn->unmade += 1;
}
}
Lst_Close(&cgn->children);
pgn->type |= cgn->type & ~(OP_OPMASK|OP_USE|OP_TRANSFORM);
/*
* This child node is now "made", so we decrement the count of
* unmade children in the parent... We also remove the child
* from the parent's list to accurately reflect the number of decent
* children the parent has. This is used by Make_Run to decide
* whether to queue the parent or examine its children...
*/
if (cgn->type & OP_USE) {
pgn->unmade--;
}
}
}
static void
MakeHandleUse(pgn, cgn)
void *pgn; /* the current parent */
void *cgn; /* the child we've just examined */
{
Make_HandleUse((GNode *)pgn, (GNode *)cgn);
}
/*-
*-----------------------------------------------------------------------
* Make_Update --
* Perform update on the parents of a node. Used by JobFinish once
* a node has been dealt with and by MakeStartJobs if it finds an
* up-to-date node.
*
* Results:
* Always returns 0
*
* Side Effects:
* The unmade field of pgn is decremented and pgn may be placed on
* the toBeMade queue if this field becomes 0.
*
* If the child was made, the parent's childMade field will be set true
* and its cmtime set to now.
*
* If the child wasn't made, the cmtime field of the parent will be
* altered if the child's mtime is big enough.
*
* Finally, if the child is the implied source for the parent, the
* parent's IMPSRC variable is set appropriately.
*
*-----------------------------------------------------------------------
*/
void
Make_Update (cgn)
register GNode *cgn; /* the child node */
{
register GNode *pgn; /* the parent node */
register char *cname; /* the child's name */
register LstNode ln; /* Element in parents and iParents lists */
cname = Varq_Value(TARGET_INDEX, cgn);
/*
* If the child was actually made, see what its modification time is
* now -- some rules won't actually update the file. If the file still
* doesn't exist, make its mtime now.
*/
if (cgn->made != UPTODATE) {
#ifndef RECHECK
/*
* We can't re-stat the thing, but we can at least take care of rules
* where a target depends on a source that actually creates the
* target, but only if it has changed, e.g.
*
* parse.h : parse.o
*
* parse.o : parse.y
* yacc -d parse.y
* cc -c y.tab.c
* mv y.tab.o parse.o
* cmp -s y.tab.h parse.h || mv y.tab.h parse.h
*
* In this case, if the definitions produced by yacc haven't changed
* from before, parse.h won't have been updated and cgn->mtime will
* reflect the current modification time for parse.h. This is
* something of a kludge, I admit, but it's a useful one..
* XXX: People like to use a rule like
*
* FRC:
*
* To force things that depend on FRC to be made, so we have to
* check for gn->children being empty as well...
*/
if (!Lst_IsEmpty(&cgn->commands) || Lst_IsEmpty(&cgn->children)) {
cgn->mtime = now;
}
#else
/*
* This is what Make does and it's actually a good thing, as it
* allows rules like
*
* cmp -s y.tab.h parse.h || cp y.tab.h parse.h
*
* to function as intended. Unfortunately, thanks to the stateless
* nature of NFS (by which I mean the loose coupling of two clients
* using the same file from a common server), there are times
* when the modification time of a file created on a remote
* machine will not be modified before the local stat() implied by
* the Dir_MTime occurs, thus leading us to believe that the file
* is unchanged, wreaking havoc with files that depend on this one.
*
* I have decided it is better to make too much than to make too
* little, so this stuff is commented out unless you're sure it's ok.
* -- ardeb 1/12/88
*/
/*
* Christos, 4/9/92: If we are saving commands pretend that
* the target is made now. Otherwise archives with ... rules
* don't work!
*/
if (noExecute || (cgn->type & OP_SAVE_CMDS) ||
is_out_of_date(Dir_MTime(cgn))) {
cgn->mtime = now;
}
if (DEBUG(MAKE)) {
printf("update time: %s\n", Targ_FmtTime(cgn->mtime));
}
#endif
}
Lst_Open(&cgn->parents);
while ((ln = Lst_Next(&cgn->parents)) != NULL) {
pgn = (GNode *)Lst_Datum(ln);
if (pgn->make) {
pgn->unmade -= 1;
if ( ! (cgn->type & (OP_EXEC|OP_USE))) {
if (cgn->made == MADE) {
pgn->childMade = TRUE;
if (is_before(pgn->cmtime, cgn->mtime)) {
pgn->cmtime = cgn->mtime;
}
} else {
(void)Make_TimeStamp(pgn, cgn);
}
}
if (pgn->unmade == 0) {
/*
* Queue the node up -- any unmade predecessors will
* be dealt with in MakeStartJobs.
*/
Lst_EnQueue(&toBeMade, pgn);
} else if (pgn->unmade < 0) {
Error ("Graph cycles through %s", pgn->name);
}
}
}
Lst_Close(&cgn->parents);
/*
* Deal with successor nodes. If any is marked for making and has an unmade
* count of 0, has not been made and isn't in the examination queue,
* it means we need to place it in the queue as it restrained itself
* before.
*/
for (ln = Lst_First(&cgn->successors); ln != NULL; ln = Lst_Adv(ln)) {
GNode *succ = (GNode *)Lst_Datum(ln);
if (succ->make && succ->unmade == 0 && succ->made == UNMADE &&
Lst_Member(&toBeMade, succ) == NULL)
Lst_EnQueue(&toBeMade, succ);
}
/*
* Set the .PREFIX and .IMPSRC variables for all the implied parents
* of this node.
*/
{
char *cpref = Varq_Value(PREFIX_INDEX, cgn);
Lst_Open(&cgn->iParents);
while ((ln = Lst_Next(&cgn->iParents)) != NULL) {
pgn = (GNode *)Lst_Datum (ln);
if (pgn->make) {
Varq_Set(IMPSRC_INDEX, cname, pgn);
Varq_Set(PREFIX_INDEX, cpref, pgn);
}
}
Lst_Close(&cgn->iParents);
}
}
/*-
*-----------------------------------------------------------------------
* MakeAddAllSrc --
* Add a child's name to the ALLSRC and OODATE variables of the given
* node. Called from Make_DoAllVar via Lst_ForEach. A child is added only
* if it has not been given the .EXEC, .USE or .INVISIBLE attributes.
* .EXEC and .USE children are very rarely going to be files, so...
* A child is added to the OODATE variable if its modification time is
* later than that of its parent, as defined by Make, except if the
* parent is a .JOIN node. In that case, it is only added to the OODATE
* variable if it was actually made (since .JOIN nodes don't have
* modification times, the comparison is rather unfair...)..
*
* Side Effects:
* The ALLSRC variable for the given node is extended.
*-----------------------------------------------------------------------
*/
static void
MakeAddAllSrc(cgnp, pgnp)
void *cgnp; /* The child to add */
void *pgnp; /* The parent to whose ALLSRC variable it should be */
/* added */
{
GNode *cgn = (GNode *) cgnp;
GNode *pgn = (GNode *) pgnp;
if ((cgn->type & (OP_EXEC|OP_USE|OP_INVISIBLE)) == 0) {
char *child;
if (OP_NOP(cgn->type) ||
(child = Varq_Value(TARGET_INDEX, cgn)) == NULL) {
/*
* this node is only source; use the specific pathname for it
*/
child = cgn->path ? cgn->path : cgn->name;
}
Varq_Append(ALLSRC_INDEX, child, pgn);
if (pgn->type & OP_JOIN) {
if (cgn->made == MADE)
Varq_Append(OODATE_INDEX, child, pgn);
} else if (is_before(pgn->mtime, cgn->mtime) ||
(!is_before(cgn->mtime, now) && cgn->made == MADE))
{
/*
* It goes in the OODATE variable if the parent is younger than the
* child or if the child has been modified more recently than
* the start of the make. This is to keep pmake from getting
* confused if something else updates the parent after the
* make starts (shouldn't happen, I know, but sometimes it
* does). In such a case, if we've updated the kid, the parent
* is likely to have a modification time later than that of
* the kid and anything that relies on the OODATE variable will
* be hosed.
*
* XXX: This will cause all made children to go in the OODATE
* variable, even if they're not touched, if RECHECK isn't defined,
* since cgn->mtime is set to now in Make_Update. According to
* some people, this is good...
*/
Varq_Append(OODATE_INDEX, child, pgn);
}
}
}
/*-
*-----------------------------------------------------------------------
* Make_DoAllVar --
* Set up the ALLSRC and OODATE variables. Sad to say, it must be
* done separately, rather than while traversing the graph. This is
* because Make defined OODATE to contain all sources whose modification
* times were later than that of the target, *not* those sources that
* were out-of-date. Since in both compatibility and native modes,
* the modification time of the parent isn't found until the child
* has been dealt with, we have to wait until now to fill in the
* variable. As for ALLSRC, the ordering is important and not
* guaranteed when in native mode, so it must be set here, too.
*
* Results:
* None
*
* Side Effects:
* The ALLSRC and OODATE variables of the given node is filled in.
* If the node is a .JOIN node, its TARGET variable will be set to
* match its ALLSRC variable.
*-----------------------------------------------------------------------
*/
void
Make_DoAllVar (gn)
GNode *gn;
{
Lst_ForEach(&gn->children, MakeAddAllSrc, gn);
if (!Varq_Exists(OODATE_INDEX, gn))
Varq_Set(OODATE_INDEX, "", gn);
if (!Varq_Exists(ALLSRC_INDEX, gn))
Varq_Set(ALLSRC_INDEX, "", gn);
if (gn->type & OP_JOIN)
Varq_Set(TARGET_INDEX, Varq_Value(ALLSRC_INDEX, gn), gn);
}
/*-
*-----------------------------------------------------------------------
* MakeStartJobs --
* Start as many jobs as possible.
*
* Results:
* If the query flag was given to pmake, no job will be started,
* but as soon as an out-of-date target is found, this function
* returns TRUE. At all other times, this function returns FALSE.
*
* Side Effects:
* Nodes are removed from the toBeMade queue and job table slots
* are filled.
*
*-----------------------------------------------------------------------
*/
static Boolean
MakeStartJobs ()
{
register GNode *gn;
while (!Job_Full() && (gn = (GNode *)Lst_DeQueue(&toBeMade)) != NULL) {
if (DEBUG(MAKE)) {
printf ("Examining %s...", gn->name);
}
/*
* Make sure any and all predecessors that are going to be made,
* have been.
*/
if (!Lst_IsEmpty(&gn->preds)) {
LstNode ln;
for (ln = Lst_First(&gn->preds); ln != NULL; ln = Lst_Adv(ln)){
GNode *pgn = (GNode *)Lst_Datum(ln);
if (pgn->make && pgn->made == UNMADE) {
if (DEBUG(MAKE)) {
printf("predecessor %s not made yet.\n", pgn->name);
}
break;
}
}
/*
* If ln isn't null, there's a predecessor as yet unmade, so we
* just drop this node on the floor. When the node in question
* has been made, it will notice this node as being ready to
* make but as yet unmade and will place the node on the queue.
*/
if (ln != NULL) {
continue;
}
}
numNodes--;
if (Make_OODate (gn)) {
if (DEBUG(MAKE)) {
printf ("out-of-date\n");
}
if (queryFlag) {
return (TRUE);
}
Make_DoAllVar (gn);
Job_Make (gn);
} else {
if (DEBUG(MAKE)) {
printf ("up-to-date\n");
}
gn->made = UPTODATE;
if (gn->type & OP_JOIN) {
/*
* Even for an up-to-date .JOIN node, we need it to have its
* context variables so references to it get the correct
* value for .TARGET when building up the context variables
* of its parent(s)...
*/
Make_DoAllVar (gn);
}
Make_Update (gn);
}
}
return (FALSE);
}
/*-
*-----------------------------------------------------------------------
* MakePrintStatus --
* Print the status of a top-level node, viz. it being up-to-date
* already or not created due to an error in a lower level.
* Callback function for Make_Run via Lst_ForEach.
*-----------------------------------------------------------------------
*/
static void
MakePrintStatus(gnp, cyclep)
void *gnp; /* Node to examine */
void *cyclep; /* True if gn->unmade being non-zero implies
* a cycle in the graph, not an error in an
* inferior */
{
GNode *gn = (GNode *) gnp;
Boolean cycle = *(Boolean *) cyclep;
if (gn->made == UPTODATE) {
printf ("`%s' is up to date.\n", gn->name);
} else if (gn->unmade != 0) {
if (cycle) {
Boolean t = TRUE;
/*
* If printing cycles and came to one that has unmade children,
* print out the cycle by recursing on its children. Note a
* cycle like:
* a : b
* b : c
* c : b
* will cause this to erroneously complain about a being in
* the cycle, but this is a good approximation.
*/
if (gn->made == CYCLE) {
Error("Graph cycles through `%s'", gn->name);
gn->made = ENDCYCLE;
Lst_ForEach(&gn->children, MakePrintStatus, &t);
gn->made = UNMADE;
} else if (gn->made != ENDCYCLE) {
gn->made = CYCLE;
Lst_ForEach(&gn->children, MakePrintStatus, &t);
}
} else {
printf ("`%s' not remade because of errors.\n", gn->name);
}
}
}
/*-
*-----------------------------------------------------------------------
* Make_Run --
* Initialize the nodes to remake and the list of nodes which are
* ready to be made by doing a breadth-first traversal of the graph
* starting from the nodes in the given list. Once this traversal
* is finished, all the 'leaves' of the graph are in the toBeMade
* queue.
* Using this queue and the Job module, work back up the graph,
* calling on MakeStartJobs to keep the job table as full as
* possible.
*
* Results:
* TRUE if work was done. FALSE otherwise.
*
* Side Effects:
* The make field of all nodes involved in the creation of the given
* targets is set to 1. The toBeMade list is set to contain all the
* 'leaves' of these subgraphs.
*-----------------------------------------------------------------------
*/
Boolean
Make_Run(targs)
Lst targs; /* the initial list of targets */
{
register GNode *gn; /* a temporary pointer */
LIST examine; /* List of targets to examine */
int errors; /* Number of errors the Job module reports */
Lst_Init(&toBeMade);
Lst_Clone(&examine, targs, NOCOPY);
numNodes = 0;
/*
* Make an initial downward pass over the graph, marking nodes to be made
* as we go down. We call Suff_FindDeps to find where a node is and
* to get some children for it if it has none and also has no commands.
* If the node is a leaf, we stick it on the toBeMade queue to
* be looked at in a minute, otherwise we add its children to our queue
* and go on about our business.
*/
while ((gn = (GNode *)Lst_DeQueue(&examine)) != NULL) {
if (!gn->make) {
gn->make = TRUE;
numNodes++;
/*
* Apply any .USE rules before looking for implicit dependencies
* to make sure everything has commands that should...
*/
Lst_ForEach(&gn->children, MakeHandleUse, gn);
Suff_FindDeps (gn);
if (gn->unmade != 0) {
Lst_ForEach(&gn->children, MakeAddChild, &examine);
} else {
Lst_EnQueue(&toBeMade, gn);
}
}
}
Lst_Destroy(&examine, NOFREE);
if (queryFlag) {
/*
* We wouldn't do any work unless we could start some jobs in the
* next loop... (we won't actually start any, of course, this is just
* to see if any of the targets was out of date)
*/
return (MakeStartJobs());
} else {
/*
* Initialization. At the moment, no jobs are running and until some
* get started, nothing will happen since the remaining upward
* traversal of the graph is performed by the routines in job.c upon
* the finishing of a job. So we fill the Job table as much as we can
* before going into our loop.
*/
(void) MakeStartJobs();
}
/*
* Main Loop: The idea here is that the ending of jobs will take
* care of the maintenance of data structures and the waiting for output
* will cause us to be idle most of the time while our children run as
* much as possible. Because the job table is kept as full as possible,
* the only time when it will be empty is when all the jobs which need
* running have been run, so that is the end condition of this loop.
* Note that the Job module will exit if there were any errors unless the
* keepgoing flag was given.
*/
while (!Job_Empty ()) {
Job_CatchOutput ();
Job_CatchChildren (!usePipes);
(void)MakeStartJobs();
}
errors = Job_Finish();
/*
* Print the final status of each target. E.g. if it wasn't made
* because some inferior reported an error.
*/
errors = ((errors == 0) && (numNodes != 0));
Lst_ForEach(targs, MakePrintStatus, &errors);
return (TRUE);
}
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