File: [local] / src / usr.bin / make / make.c (download)
Revision 1.19, Fri Jun 23 16:15:50 2000 UTC (23 years, 11 months ago) by espie
Branch: MAIN
Changes since 1.18: +39 -40 lines
Trivial consequences of the previous list changes:
- audit code for Lst_Datum, it's never applied to an empty pointer,
so check can be removed -> turn into a macro,
- Lst_First, Lst_Last can become macro as well
- specialized version of Lst_Succ (Lst_Adv) to use in loops where it cannot
fail,
- Lst_Open can no longer fail. Trim down corresponding code.
Reviewed millert@, miod@
|
/* $OpenBSD: make.c,v 1.19 2000/06/23 16:15:50 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.
*/
#ifndef lint
#if 0
static char sccsid[] = "@(#)make.c 8.1 (Berkeley) 6/6/93";
#else
static char rcsid[] = "$OpenBSD: make.c,v 1.19 2000/06/23 16:15:50 espie Exp $";
#endif
#endif /* not lint */
/*-
* 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 "make.h"
#include "hash.h"
#include "dir.h"
#include "job.h"
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.
*
* Results:
* Always returns 0.
*
* 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 (cgn->mtime > pgn->cmtime)
pgn->cmtime = cgn->mtime;
}
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 (gn->mtime != OUT_OF_DATE) {
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) ||
(gn->cmtime == OUT_OF_DATE && (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 (gn->mtime < gn->cmtime ||
(gn->cmtime == OUT_OF_DATE &&
(gn->mtime == OUT_OF_DATE || (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 (gn->mtime < gn->cmtime) {
printf("modified before source...");
} else if (gn->mtime == OUT_OF_DATE) {
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 = Var_Value(TARGET, 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) || Dir_MTime(cgn) == FALSE) {
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 (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 = Var_Value(PREFIX, cgn);
Lst_Open(&cgn->iParents);
while ((ln = Lst_Next(&cgn->iParents)) != NULL) {
pgn = (GNode *)Lst_Datum (ln);
if (pgn->make) {
Var_Set (IMPSRC, cname, pgn);
Var_Set (PREFIX, 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 = Var_Value(TARGET, cgn)) == NULL) {
/*
* this node is only source; use the specific pathname for it
*/
child = cgn->path ? cgn->path : cgn->name;
}
Var_Append (ALLSRC, child, pgn);
if (pgn->type & OP_JOIN) {
if (cgn->made == MADE) {
Var_Append(OODATE, child, pgn);
}
} else if ((pgn->mtime < cgn->mtime) ||
(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...
*/
Var_Append(OODATE, 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 (!Var_Exists (OODATE, gn)) {
Var_Set (OODATE, "", gn);
}
if (!Var_Exists (ALLSRC, gn)) {
Var_Set (ALLSRC, "", gn);
}
if (gn->type & OP_JOIN)
Var_Set(TARGET, Var_Value(ALLSRC, 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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