make1.c

jam源码

	    }

	    /* Tell parents dependent has been built */

	    t->progress = T_MAKE_DONE;

	    for( c = t->parents; c; c = c->next )
		make1b( c->target );
	}
}

/*
 * make1d() - handle command execution completion and call back make1c()
 */

static void
make1d( 
	void	*closure,
	int	status )
{
	TARGET	*t = (TARGET *)closure;
	CMD	*cmd = (CMD *)t->cmds;

	/* Execcmd() has completed.  All we need to do is fiddle with the */
	/* status and signal our completion so make1c() can run the next */
	/* command.  On interrupts, we bail heavily. */

	if( status == EXEC_CMD_FAIL && ( cmd->rule->flags & RULE_IGNORE ) )
	    status = EXEC_CMD_OK;

	/* On interrupt, set intr so _everything_ fails */

	if( status == EXEC_CMD_INTR )
	    ++intr;

	if( status == EXEC_CMD_FAIL && DEBUG_MAKE )
	{
	    /* Print command text on failure */

	    if( !DEBUG_EXEC )
		printf( "%s\n", cmd->buf );

	    printf( "...failed %s ", cmd->rule->name );
	    list_print( lol_get( &cmd->args, 0 ) );
	    printf( "...\n" );

	    if( globs.quitquick ) ++intr;
	}

	/* If the command was interrupted or failed and the target */
	/* is not "precious", remove the targets. */
	/* Precious == 'actions updated' -- the target maintains state. */

	if( status != EXEC_CMD_OK && !( cmd->rule->flags & RULE_UPDATED ) )
	{
	    LIST *targets = lol_get( &cmd->args, 0 );

	    for( ; targets; targets = list_next( targets ) )
		if( !unlink( targets->string ) )
		    printf( "...removing %s\n", targets->string );
	}

	/* Free this command and call make1c() to move onto next command. */

	t->status = status;
	t->cmds = (char *)cmd_next( cmd );

	cmd_free( cmd );

	make1c( t );
}

/*
 * make1cmds() - turn ACTIONS into CMDs, grouping, splitting, etc
 *
 * Essentially copies a chain of ACTIONs to a chain of CMDs, 
 * grouping RULE_TOGETHER actions, splitting RULE_PIECEMEAL actions,
 * and handling RULE_UPDATED actions.  The result is a chain of
 * CMDs which can be expanded by var_string() and executed with
 * execcmd().
 */

static CMD *
make1cmds( ACTIONS *a0 )
{
	CMD *cmds = 0;
	LIST *shell = var_get( "JAMSHELL" );	/* shell is per-target */

	/* Step through actions */
	/* Actions may be shared with other targets or grouped with */
	/* RULE_TOGETHER, so actions already seen are skipped. */

	for( ; a0; a0 = a0->next )
	{
	    RULE    *rule = a0->action->rule;
	    SETTINGS *boundvars;
	    LIST    *nt, *ns;
	    ACTIONS *a1;
	    CMD	    *cmd;
	    int	    start, chunk, length, maxline;

	    /* Only do rules with commands to execute. */
	    /* If this action has already been executed, use saved status */

	    if( !rule->actions || a0->action->running )
		continue;

	    a0->action->running = 1;
	    
	    /* Make LISTS of targets and sources */
	    /* If `execute together` has been specified for this rule, tack */
	    /* on sources from each instance of this rule for this target. */

	    nt = make1list( L0, a0->action->targets, 0 );
	    ns = make1list( L0, a0->action->sources, rule->flags );

	    if( rule->flags & RULE_TOGETHER )
		for( a1 = a0->next; a1; a1 = a1->next )
		    if( a1->action->rule == rule && !a1->action->running )
	    {
		ns = make1list( ns, a1->action->sources, rule->flags );
		a1->action->running = 1;
	    }

	    /* If doing only updated (or existing) sources, but none have */
	    /* been updated (or exist), skip this action. */

	    if( !ns && ( rule->flags & ( RULE_UPDATED | RULE_EXISTING ) ) )
	    {
		list_free( nt );
		continue;
	    }

	    /* If we had 'actions xxx bind vars' we bind the vars now */

	    boundvars = make1settings( rule->bindlist );
	    pushsettings( boundvars );

	    /*
	     * Build command, starting with all source args. 
	     *
	     * If cmd_new returns 0, it's because the resulting command
	     * length is > MAXLINE.  In this case, we'll slowly reduce
	     * the number of source arguments presented until it does
	     * fit.  This only applies to actions that allow PIECEMEAL 
	     * commands.
	     *
	     * While reducing slowly takes a bit of compute time to get
	     * things just right, it's worth it to get as close to MAXLINE
	     * as possible, because launching the commands we're executing 
	     * is likely to be much more compute intensive!
	     *
	     * Note we loop through at least once, for sourceless actions.
	     *
	     * Max line length is the action specific maxline or, if not 
	     * given or bigger than MAXLINE, MAXLINE.
	     */

	    start = 0;
	    chunk = length = list_length( ns );
	    maxline = rule->flags / RULE_MAXLINE;
	    maxline = maxline && maxline < MAXLINE ? maxline : MAXLINE;

	    do
	    {
		/* Build cmd: cmd_new consumes its lists. */

		CMD *cmd = cmd_new( rule, 
			list_copy( L0, nt ), 
			list_sublist( ns, start, chunk ),
			list_copy( L0, shell ),
			maxline );

		if( cmd )
		{
		    /* It fit: chain it up. */

		    if( !cmds ) cmds = cmd;
		    else cmds->tail->next = cmd;
		    cmds->tail = cmd;
		    start += chunk;
		}
		else if( ( rule->flags & RULE_PIECEMEAL ) && chunk > 1 )
		{
		    /* Reduce chunk size slowly. */

		    chunk = chunk * 9 / 10;
		}
		else
		{
		    /* Too long and not splittable. */

		    printf( "%s actions too long (max %d)!\n", 
			rule->name, maxline );
		    exit( EXITBAD );
		}
	    }
	    while( start < length );

	    /* These were always copied when used. */

	    list_free( nt );
	    list_free( ns );

	    /* Free the variables whose values were bound by */
	    /* 'actions xxx bind vars' */

	    popsettings( boundvars );
	    freesettings( boundvars );
	}

	return cmds;
}

/*
 * make1list() - turn a list of targets into a LIST, for $(<) and $(>)
 */

static LIST *
make1list( 
	LIST	*l,
	TARGETS	*targets,
	int	flags )
{
    for( ; targets; targets = targets->next )
    {
	TARGET *t = targets->target;

	/* Sources to 'actions existing' are never in the dependency */
	/* graph (if they were, they'd get built and 'existing' would */
	/* be superfluous, so throttle warning message about independent */
	/* targets. */

	if( t->binding == T_BIND_UNBOUND )
	    make1bind( t, !( flags & RULE_EXISTING ) );

	if( ( flags & RULE_EXISTING ) && t->binding != T_BIND_EXISTS )
	    continue;

	if( ( flags & RULE_UPDATED ) && t->fate <= T_FATE_STABLE )
	    continue;

	/* Prohibit duplicates for RULE_TOGETHER */

	if( flags & RULE_TOGETHER )
	{
	    LIST *m;

	    for( m = l; m; m = m->next )
		if( !strcmp( m->string, t->boundname ) )
		    break;

	    if( m )
		continue;
	}

	/* Build new list */

	l = list_new( l, t->boundname, 1 );
    }

    return l;
}

/*
 * make1settings() - for vars that get bound values, build up replacement lists
 */

static SETTINGS *
make1settings( LIST *vars )
{
	SETTINGS *settings = 0;

	for( ; vars; vars = list_next( vars ) )
	{
	    LIST *l = var_get( vars->string );
	    LIST *nl = 0;

	    for( ; l; l = list_next( l ) ) 
	    {
		TARGET *t = bindtarget( l->string );

		/* Make sure the target is bound, warning if it is not in the */
		/* dependency graph. */

		if( t->binding == T_BIND_UNBOUND )
		    make1bind( t, 1 );

		/* Build new list */

		nl = list_new( nl, t->boundname, 1 );
	    }

	    /* Add to settings chain */

	    settings = addsettings( settings, 0, vars->string, nl );
	}

	return settings;
}

/*
 * make1bind() - bind targets that weren't bound in dependency analysis
 *
 * Spot the kludge!  If a target is not in the dependency tree, it didn't 
 * get bound by make0(), so we have to do it here.  Ugly.
 */

static void
make1bind( 
	TARGET	*t,
	int	warn )
{
	if( t->flags & T_FLAG_NOTFILE )
	    return;

	/* Sources to 'actions existing' are never in the dependency */
	/* graph (if they were, they'd get built and 'existing' would */
	/* be superfluous, so throttle warning message about independent */
	/* targets. */

	if( warn )
	    printf( "warning: using independent target %s\n", t->name );

	pushsettings( t->settings );
	t->boundname = search( t->name, &t->time );
	t->binding = t->time ? T_BIND_EXISTS : T_BIND_MISSING;
	popsettings( t->settings );
}