8 * Return value of comparison functions used to sort tables:
14 static void order_and_dump_functions_by_arcs PARAMS ((Arc **, unsigned long,
17 /* declarations of automatically generated functions to output blurbs: */
18 extern void bsd_callg_blurb PARAMS ((FILE * fp));
19 extern void fsf_callg_blurb PARAMS ((FILE * fp));
21 double print_time = 0.0;
25 DEFUN_VOID (print_header)
35 if (!bsd_style_output)
37 if (print_descriptions)
39 printf ("\t\t Call graph (explanation follows)\n\n");
43 printf ("\t\t\tCall graph\n\n");
46 printf ("\ngranularity: each sample hit covers %ld byte(s)",
47 (long) hist_scale * sizeof (UNIT));
50 printf (" for %.2f%% of %.2f seconds\n\n",
51 100.0 / print_time, print_time / hz);
55 printf (" no time propagated\n\n");
57 * This doesn't hurt, since all the numerators will be 0.0:
63 printf ("%6.6s %5.5s %7.7s %11.11s %7.7s/%-7.7s %-8.8s\n",
64 "", "", "", "", "called", "total", "parents");
65 printf ("%-6.6s %5.5s %7.7s %11.11s %7.7s+%-7.7s %-8.8s\t%5.5s\n",
66 "index", "%time", "self", "descendents",
67 "called", "self", "name", "index");
68 printf ("%6.6s %5.5s %7.7s %11.11s %7.7s/%-7.7s %-8.8s\n",
69 "", "", "", "", "called", "total", "children");
74 printf ("index %% time self children called name\n");
80 * Print a cycle header.
83 DEFUN (print_cycle, (cyc), Sym * cyc)
87 sprintf (buf, "[%d]", cyc->cg.index);
88 printf (bsd_style_output
89 ? "%-6.6s %5.1f %7.2f %11.2f %7d"
90 : "%-6.6s %5.1f %7.2f %7.2f %7d", buf,
91 100 * (cyc->cg.prop.self + cyc->cg.prop.child) / print_time,
92 cyc->cg.prop.self / hz, cyc->cg.prop.child / hz, cyc->ncalls);
93 if (cyc->cg.self_calls != 0)
95 printf ("+%-7d", cyc->cg.self_calls);
99 printf (" %7.7s", "");
101 printf (" <cycle %d as a whole> [%d]\n", cyc->cg.cyc.num, cyc->cg.index);
106 * Compare LEFT and RIGHT membmer. Major comparison key is
107 * CG.PROP.SELF+CG.PROP.CHILD, secondary key is NCALLS+CG.SELF_CALLS.
110 DEFUN (cmp_member, (left, right), Sym * left AND Sym * right)
112 double left_time = left->cg.prop.self + left->cg.prop.child;
113 double right_time = right->cg.prop.self + right->cg.prop.child;
114 long left_calls = left->ncalls + left->cg.self_calls;
115 long right_calls = right->ncalls + right->cg.self_calls;
117 if (left_time > right_time)
121 if (left_time < right_time)
126 if (left_calls > right_calls)
130 if (left_calls < right_calls)
139 * Sort members of a cycle.
142 DEFUN (sort_members, (cyc), Sym * cyc)
144 Sym *todo, *doing, *prev;
146 * Detach cycle members from cyclehead, and insertion sort them
149 todo = cyc->cg.cyc.next;
150 cyc->cg.cyc.next = 0;
151 for (doing = todo; doing && doing->cg.cyc.next; doing = todo)
153 todo = doing->cg.cyc.next;
154 for (prev = cyc; prev->cg.cyc.next; prev = prev->cg.cyc.next)
156 if (cmp_member (doing, prev->cg.cyc.next) == GREATERTHAN)
161 doing->cg.cyc.next = prev->cg.cyc.next;
162 prev->cg.cyc.next = doing;
168 * Print the members of a cycle.
171 DEFUN (print_members, (cyc), Sym * cyc)
176 for (member = cyc->cg.cyc.next; member; member = member->cg.cyc.next)
178 printf (bsd_style_output
179 ? "%6.6s %5.5s %7.2f %11.2f %7d"
180 : "%6.6s %5.5s %7.2f %7.2f %7d",
181 "", "", member->cg.prop.self / hz, member->cg.prop.child / hz,
183 if (member->cg.self_calls != 0)
185 printf ("+%-7d", member->cg.self_calls);
189 printf (" %7.7s", "");
199 * Compare two arcs to/from the same child/parent.
200 * - if one arc is a self arc, it's least.
201 * - if one arc is within a cycle, it's less than.
202 * - if both arcs are within a cycle, compare arc counts.
203 * - if neither arc is within a cycle, compare with
204 * time + child_time as major key
205 * arc count as minor key
208 DEFUN (cmp_arc, (left, right), Arc * left AND Arc * right)
210 Sym *left_parent = left->parent;
211 Sym *left_child = left->child;
212 Sym *right_parent = right->parent;
213 Sym *right_child = right->child;
214 double left_time, right_time;
217 printf ("[cmp_arc] ");
218 print_name (left_parent);
220 print_name (left_child);
221 printf (" %f + %f %d/%d\n", left->time, left->child_time,
222 left->count, left_child->ncalls);
223 printf ("[cmp_arc] ");
224 print_name (right_parent);
226 print_name (right_child);
227 printf (" %f + %f %d/%d\n", right->time, right->child_time,
228 right->count, right_child->ncalls);
231 if (left_parent == left_child)
233 return LESSTHAN; /* left is a self call */
235 if (right_parent == right_child)
237 return GREATERTHAN; /* right is a self call */
240 if (left_parent->cg.cyc.num != 0 && left_child->cg.cyc.num != 0
241 && left_parent->cg.cyc.num == left_child->cg.cyc.num)
243 /* left is a call within a cycle */
244 if (right_parent->cg.cyc.num != 0 && right_child->cg.cyc.num != 0
245 && right_parent->cg.cyc.num == right_child->cg.cyc.num)
247 /* right is a call within the cycle, too */
248 if (left->count < right->count)
252 if (left->count > right->count)
260 /* right isn't a call within the cycle */
266 /* left isn't a call within a cycle */
267 if (right_parent->cg.cyc.num != 0 && right_child->cg.cyc.num != 0
268 && right_parent->cg.cyc.num == right_child->cg.cyc.num)
270 /* right is a call within a cycle */
275 /* neither is a call within a cycle */
276 left_time = left->time + left->child_time;
277 right_time = right->time + right->child_time;
278 if (left_time < right_time)
282 if (left_time > right_time)
286 if (left->count < right->count)
290 if (left->count > right->count)
301 DEFUN (sort_parents, (child), Sym * child)
303 Arc *arc, *detached, sorted, *prev;
306 * Unlink parents from child, then insertion sort back on to
308 * *arc the arc you have detached and are inserting.
309 * *detached the rest of the arcs to be sorted.
310 * sorted arc list onto which you insertion sort.
311 * *prev arc before the arc you are comparing.
313 sorted.next_parent = 0;
314 for (arc = child->cg.parents; arc; arc = detached)
316 detached = arc->next_parent;
318 /* consider *arc as disconnected; insert it into sorted: */
319 for (prev = &sorted; prev->next_parent; prev = prev->next_parent)
321 if (cmp_arc (arc, prev->next_parent) != GREATERTHAN)
326 arc->next_parent = prev->next_parent;
327 prev->next_parent = arc;
330 /* reattach sorted arcs to child: */
331 child->cg.parents = sorted.next_parent;
336 DEFUN (print_parents, (child), Sym * child)
342 if (child->cg.cyc.head != 0)
344 cycle_head = child->cg.cyc.head;
350 if (!child->cg.parents)
352 printf (bsd_style_output
353 ? "%6.6s %5.5s %7.7s %11.11s %7.7s %7.7s <spontaneous>\n"
354 : "%6.6s %5.5s %7.7s %7.7s %7.7s %7.7s <spontaneous>\n",
355 "", "", "", "", "", "");
358 sort_parents (child);
359 for (arc = child->cg.parents; arc; arc = arc->next_parent)
361 parent = arc->parent;
362 if (child == parent || (child->cg.cyc.num != 0
363 && parent->cg.cyc.num == child->cg.cyc.num))
365 /* selfcall or call among siblings: */
366 printf (bsd_style_output
367 ? "%6.6s %5.5s %7.7s %11.11s %7d %7.7s "
368 : "%6.6s %5.5s %7.7s %7.7s %7d %7.7s ",
376 /* regular parent of child: */
377 printf (bsd_style_output
378 ? "%6.6s %5.5s %7.2f %11.2f %7d/%-7d "
379 : "%6.6s %5.5s %7.2f %7.2f %7d/%-7d ",
381 arc->time / hz, arc->child_time / hz,
382 arc->count, cycle_head->ncalls);
391 DEFUN (sort_children, (parent), Sym * parent)
393 Arc *arc, *detached, sorted, *prev;
395 * Unlink children from parent, then insertion sort back on to
397 * *arc the arc you have detached and are inserting.
398 * *detached the rest of the arcs to be sorted.
399 * sorted arc list onto which you insertion sort.
400 * *prev arc before the arc you are comparing.
402 sorted.next_child = 0;
403 for (arc = parent->cg.children; arc; arc = detached)
405 detached = arc->next_child;
407 /* consider *arc as disconnected; insert it into sorted: */
408 for (prev = &sorted; prev->next_child; prev = prev->next_child)
410 if (cmp_arc (arc, prev->next_child) != LESSTHAN)
415 arc->next_child = prev->next_child;
416 prev->next_child = arc;
419 /* reattach sorted children to parent: */
420 parent->cg.children = sorted.next_child;
425 DEFUN (print_children, (parent), Sym * parent)
430 sort_children (parent);
431 arc = parent->cg.children;
432 for (arc = parent->cg.children; arc; arc = arc->next_child)
435 if (child == parent || (child->cg.cyc.num != 0
436 && child->cg.cyc.num == parent->cg.cyc.num))
438 /* self call or call to sibling: */
439 printf (bsd_style_output
440 ? "%6.6s %5.5s %7.7s %11.11s %7d %7.7s "
441 : "%6.6s %5.5s %7.7s %7.7s %7d %7.7s ",
442 "", "", "", "", arc->count, "");
448 /* regular child of parent: */
449 printf (bsd_style_output
450 ? "%6.6s %5.5s %7.2f %11.2f %7d/%-7d "
451 : "%6.6s %5.5s %7.2f %7.2f %7d/%-7d ",
453 arc->time / hz, arc->child_time / hz,
454 arc->count, child->cg.cyc.head->ncalls);
463 DEFUN (print_line, (np), Sym * np)
467 sprintf (buf, "[%d]", np->cg.index);
468 printf (bsd_style_output
469 ? "%-6.6s %5.1f %7.2f %11.2f"
470 : "%-6.6s %5.1f %7.2f %7.2f", buf,
471 100 * (np->cg.prop.self + np->cg.prop.child) / print_time,
472 np->cg.prop.self / hz, np->cg.prop.child / hz);
473 if ((np->ncalls + np->cg.self_calls) != 0)
475 printf (" %7d", np->ncalls);
476 if (np->cg.self_calls != 0)
478 printf ("+%-7d ", np->cg.self_calls);
482 printf (" %7.7s ", "");
487 printf (" %7.7s %7.7s ", "", "");
495 * Print dynamic call graph.
498 DEFUN (cg_print, (timesortsym), Sym ** timesortsym)
503 if (print_descriptions && bsd_style_output)
505 bsd_callg_blurb (stdout);
510 for (index = 0; index < symtab.len + num_cycles; ++index)
512 parent = timesortsym[index];
513 if ((ignore_zeros && parent->ncalls == 0
514 && parent->cg.self_calls == 0 && parent->cg.prop.self == 0
515 && parent->cg.prop.child == 0)
516 || !parent->cg.print_flag
517 || (line_granularity && ! parent->is_func))
521 if (!parent->name && parent->cg.cyc.num != 0)
524 print_cycle (parent);
525 print_members (parent);
529 print_parents (parent);
531 print_children (parent);
533 if (bsd_style_output)
535 printf ("-----------------------------------------------\n");
536 if (bsd_style_output)
540 if (print_descriptions && !bsd_style_output)
542 fsf_callg_blurb (stdout);
548 DEFUN (cmp_name, (left, right), const PTR left AND const PTR right)
550 const Sym **npp1 = (const Sym **) left;
551 const Sym **npp2 = (const Sym **) right;
553 return strcmp ((*npp1)->name, (*npp2)->name);
558 DEFUN_VOID (cg_print_index)
560 int index, nnames, todo, i, j, col, starting_col;
561 Sym **name_sorted_syms, *sym;
562 const char *filename;
564 int column_width = (output_width - 1) / 3; /* don't write in last col! */
566 * Now, sort regular function name alphabetically to create an
569 name_sorted_syms = (Sym **) xmalloc ((symtab.len + num_cycles) * sizeof (Sym *));
570 for (index = 0, nnames = 0; index < symtab.len; index++)
572 if (ignore_zeros && symtab.base[index].ncalls == 0
573 && symtab.base[index].hist.time == 0)
577 name_sorted_syms[nnames++] = &symtab.base[index];
579 qsort (name_sorted_syms, nnames, sizeof (Sym *), cmp_name);
580 for (index = 1, todo = nnames; index <= num_cycles; index++)
582 name_sorted_syms[todo++] = &cycle_header[index];
584 printf ("\f\nIndex by function name\n\n");
585 index = (todo + 2) / 3;
586 for (i = 0; i < index; i++)
590 for (j = i; j < todo; j += index)
592 sym = name_sorted_syms[j];
593 if (sym->cg.print_flag)
595 sprintf (buf, "[%d]", sym->cg.index);
599 sprintf (buf, "(%d)", sym->cg.index);
603 if (bsd_style_output)
605 printf ("%6.6s %-19.19s", buf, sym->name);
610 for (; col < starting_col + 5; ++col)
614 printf (" %s ", buf);
615 col += print_name_only (sym);
616 if (!line_granularity && sym->is_static && sym->file)
618 filename = sym->file->name;
621 filename = strrchr (filename, '/');
628 filename = sym->file->name;
631 printf (" (%s)", filename);
632 col += strlen (filename) + 3;
638 if (bsd_style_output)
640 printf ("%6.6s ", buf);
641 sprintf (buf, "<cycle %d>", sym->cg.cyc.num);
642 printf ("%-19.19s", buf);
647 for (; col < starting_col + 5; ++col)
649 printf (" %s ", buf);
650 sprintf (buf, "<cycle %d>", sym->cg.cyc.num);
655 starting_col += column_width;
659 free (name_sorted_syms);
662 /* Compare two arcs based on their usage counts. We want to sort
663 in descending order. */
665 DEFUN (cmp_arc_count, (left, right), const PTR left AND const PTR right)
667 const Arc **npp1 = (const Arc **) left;
668 const Arc **npp2 = (const Arc **) right;
670 if ((*npp1)->count > (*npp2)->count)
672 else if ((*npp1)->count < (*npp2)->count)
678 /* Compare two funtions based on their usage counts. We want to sort
679 in descending order. */
681 DEFUN (cmp_fun_nuses, (left, right), const PTR left AND const PTR right)
683 const Sym **npp1 = (const Sym **) left;
684 const Sym **npp2 = (const Sym **) right;
686 if ((*npp1)->nuses > (*npp2)->nuses)
688 else if ((*npp1)->nuses < (*npp2)->nuses)
694 /* Print a suggested function ordering based on the profiling data.
696 We perform 4 major steps when ordering functions:
698 * Group unused functions together and place them at the
699 end of the function order.
701 * Search the highest use arcs (those which account for 90% of
702 the total arc count) for functions which have several parents.
704 Group those with the most call sites together (currently the
705 top 1.25% which have at least five different call sites).
707 These are emitted at the start of the function order.
709 * Use a greedy placement algorithm to place functions which
710 occur in the top 99% of the arcs in the profile. Some provisions
711 are made to handle high usage arcs where the parent and/or
712 child has already been placed.
714 * Run the same greedy placement algorithm on the remaining
715 arcs to place the leftover functions.
718 The various "magic numbers" should (one day) be tuneable by command
719 line options. They were arrived at by benchmarking a few applications
720 with various values to see which values produced better overall function
723 Of course, profiling errors, machine limitations (PA long calls), and
724 poor cutoff values for the placement algorithm may limit the usefullness
725 of the resulting function order. Improvements would be greatly appreciated.
729 * Place the functions with many callers near the middle of the
730 list to reduce long calls.
732 * Propagate arc usage changes as functions are placed. Ie if
733 func1 and func2 are placed together, arcs to/from those arcs
734 to the same parent/child should be combined, then resort the
735 arcs to choose the next one.
737 * Implement some global positioning algorithm to place the
738 chains made by the greedy local positioning algorithm. Probably
739 by examining arcs which haven't been placed yet to tie two
742 * Take a function's size and time into account in the algorithm;
743 size in particular is important on the PA (long calls). Placing
744 many small functions onto their own page may be wise.
746 * Use better profiling information; many published algorithms
747 are based on call sequences through time, rather than just
750 * Prodecure cloning could improve performance when a small number
751 of arcs account for most of the calls to a particular function.
753 * Use relocation information to avoid moving unused functions
754 completely out of the code stream; this would avoid severe lossage
755 when the profile data bears little resemblance to actual runs.
757 * Propagation of arc usages should also improve .o link line
758 ordering which shares the same arc placement algorithm with
759 the function ordering code (in fact it is a degenerate case
760 of function ordering). */
763 DEFUN_VOID (cg_print_function_ordering)
765 unsigned long index, used, unused, scratch_index;
766 unsigned long unplaced_arc_count, high_arc_count, scratch_arc_count;
768 unsigned long long total_arcs, tmp_arcs_count;
770 unsigned long total_arcs, tmp_arcs_count;
772 Sym **unused_syms, **used_syms, **scratch_syms;
773 Arc **unplaced_arcs, **high_arcs, **scratch_arcs;
779 unplaced_arc_count = 0;
781 scratch_arc_count = 0;
783 /* First group all the unused functions together. */
784 unused_syms = (Sym **) xmalloc (symtab.len * sizeof (Sym *));
785 used_syms = (Sym **) xmalloc (symtab.len * sizeof (Sym *));
786 scratch_syms = (Sym **) xmalloc (symtab.len * sizeof (Sym *));
787 high_arcs = (Arc **) xmalloc (numarcs * sizeof (Arc *));
788 scratch_arcs = (Arc **) xmalloc (numarcs * sizeof (Arc *));
789 unplaced_arcs = (Arc **) xmalloc (numarcs * sizeof (Arc *));
791 /* Walk through all the functions; mark those which are never
792 called as placed (we'll emit them as a group later). */
793 for (index = 0, used = 0, unused = 0; index < symtab.len; index++)
795 if (symtab.base[index].ncalls == 0)
797 /* Filter out gprof generated names. */
798 if (strcmp (symtab.base[index].name, "<locore>")
799 && strcmp (symtab.base[index].name, "<hicore>"))
801 unused_syms[unused++] = &symtab.base[index];
802 symtab.base[index].has_been_placed = 1;
807 used_syms[used++] = &symtab.base[index];
808 symtab.base[index].has_been_placed = 0;
809 symtab.base[index].next = 0;
810 symtab.base[index].prev = 0;
811 symtab.base[index].nuses = 0;
815 /* Sort the arcs from most used to least used. */
816 qsort (arcs, numarcs, sizeof (Arc *), cmp_arc_count);
818 /* Compute the total arc count. Also mark arcs as unplaced.
820 Note we don't compensate for overflow if that happens!
821 Overflow is much less likely when this file is compiled
822 with GCC as it can double-wide integers via long long. */
824 for (index = 0; index < numarcs; index++)
826 total_arcs += arcs[index]->count;
827 arcs[index]->has_been_placed = 0;
830 /* We want to pull out those functions which are referenced
831 by many highly used arcs and emit them as a group. This
832 could probably use some tuning. */
834 for (index = 0; index < numarcs; index++)
836 tmp_arcs_count += arcs[index]->count;
838 /* Count how many times each parent and child are used up
839 to our threshhold of arcs (90%). */
840 if ((double)tmp_arcs_count / (double)total_arcs > 0.90)
843 arcs[index]->child->nuses++;
846 /* Now sort a temporary symbol table based on the number of
847 times each function was used in the highest used arcs. */
848 memcpy (scratch_syms, used_syms, used * sizeof (Sym *));
849 qsort (scratch_syms, used, sizeof (Sym *), cmp_fun_nuses);
851 /* Now pick out those symbols we're going to emit as
852 a group. We take up to 1.25% of the used symbols. */
853 for (index = 0; index < used / 80; index++)
855 Sym *sym = scratch_syms[index];
858 /* If we hit symbols that aren't used from many call sites,
859 then we can quit. We choose five as the low limit for
860 no particular reason. */
864 /* We're going to need the arcs between these functions.
865 Unfortunately, we don't know all these functions
866 until we're done. So we keep track of all the arcs
867 to the functions we care about, then prune out those
868 which are uninteresting.
870 An interesting variation would be to quit when we found
871 multi-call site functions which account for some percentage
874 arc = sym->cg.children;
877 if (arc->parent != arc->child)
878 scratch_arcs[scratch_arc_count++] = arc;
879 arc->has_been_placed = 1;
880 arc = arc->next_child;
883 arc = sym->cg.parents;
886 if (arc->parent != arc->child)
887 scratch_arcs[scratch_arc_count++] = arc;
888 arc->has_been_placed = 1;
889 arc = arc->next_parent;
892 /* Keep track of how many symbols we're going to place. */
893 scratch_index = index;
895 /* A lie, but it makes identifying these functions easier
897 sym->has_been_placed = 1;
900 /* Now walk through the temporary arcs and copy those we care about
901 into the high arcs array. */
902 for (index = 0; index < scratch_arc_count; index++)
904 Arc *arc = scratch_arcs[index];
906 /* If this arc refers to highly used functions, then
907 then we want to keep it. */
908 if (arc->child->has_been_placed
909 && arc->parent->has_been_placed)
911 high_arcs[high_arc_count++] = scratch_arcs[index];
913 /* We need to turn of has_been_placed since we're going to
914 use the main arc placement algorithm on these arcs. */
915 arc->child->has_been_placed = 0;
916 arc->parent->has_been_placed = 0;
920 /* Dump the multi-site high usage functions which are not going
921 to be ordered by the main ordering algorithm. */
922 for (index = 0; index < scratch_index; index++)
924 if (scratch_syms[index]->has_been_placed)
925 printf ("%s\n", scratch_syms[index]->name);
928 /* Now we can order the multi-site high use functions based on the
929 arcs between them. */
930 qsort (high_arcs, high_arc_count, sizeof (Arc *), cmp_arc_count);
931 order_and_dump_functions_by_arcs (high_arcs, high_arc_count, 1,
932 unplaced_arcs, &unplaced_arc_count);
934 /* Order and dump the high use functions left, these typically
935 have only a few call sites. */
936 order_and_dump_functions_by_arcs (arcs, numarcs, 0,
937 unplaced_arcs, &unplaced_arc_count);
939 /* Now place the rarely used functions. */
940 order_and_dump_functions_by_arcs (unplaced_arcs, unplaced_arc_count, 1,
941 scratch_arcs, &scratch_arc_count);
943 /* Output any functions not emitted by the order_and_dump calls. */
944 for (index = 0; index < used; index++)
945 if (used_syms[index]->has_been_placed == 0)
946 printf("%s\n", used_syms[index]->name);
948 /* Output the unused functions. */
949 for (index = 0; index < unused; index++)
950 printf("%s\n", unused_syms[index]->name);
952 unused_syms = (Sym **) xmalloc (symtab.len * sizeof (Sym *));
953 used_syms = (Sym **) xmalloc (symtab.len * sizeof (Sym *));
954 scratch_syms = (Sym **) xmalloc (symtab.len * sizeof (Sym *));
955 high_arcs = (Arc **) xmalloc (numarcs * sizeof (Arc *));
956 scratch_arcs = (Arc **) xmalloc (numarcs * sizeof (Arc *));
957 unplaced_arcs = (Arc **) xmalloc (numarcs * sizeof (Arc *));
964 free (unplaced_arcs);
967 /* Place functions based on the arcs in ARCS with NUMARCS entries;
968 place unused arcs into UNPLACED_ARCS/UNPLACED_ARC_COUNT.
970 If ALL is nonzero, then place all functions referenced by ARCS,
971 else only place those referenced in the top 99% of the arcs in ARCS. */
975 order_and_dump_functions_by_arcs (arcs, numarcs, all,
976 unplaced_arcs, unplaced_arc_count)
978 unsigned long numarcs;
981 unsigned long *unplaced_arc_count;
984 unsigned long long tmp_arcs, total_arcs;
986 unsigned long tmp_arcs, total_arcs;
990 /* If needed, compute the total arc count.
992 Note we don't compensate for overflow if that happens! */
996 for (index = 0; index < numarcs; index++)
997 total_arcs += arcs[index]->count;
1003 for (index = 0; index < numarcs; index++)
1006 Sym *child, *parent;
1008 tmp_arcs += arcs[index]->count;
1010 /* Ignore this arc if it's already been placed. */
1011 if (arcs[index]->has_been_placed)
1014 child = arcs[index]->child;
1015 parent = arcs[index]->parent;
1017 /* If we're not using all arcs, and this is a rarely used
1018 arc, then put it on the unplaced_arc list. Similarly
1019 if both the parent and child of this arc have been placed. */
1020 if ((! all && (double)tmp_arcs / (double)total_arcs > MOST)
1021 || child->has_been_placed || parent->has_been_placed)
1023 unplaced_arcs[(*unplaced_arc_count)++] = arcs[index];
1027 /* If all slots in the parent and child are full, then there isn't
1028 anything we can do right now. We'll place this arc on the
1029 unplaced arc list in the hope that a global positioning
1030 algorithm can use it to place function chains. */
1031 if (parent->next && parent->prev && child->next && child->prev)
1033 unplaced_arcs[(*unplaced_arc_count)++] = arcs[index];
1037 /* If the parent is unattached, then find the closest
1038 place to attach it onto child's chain. Similarly
1039 for the opposite case. */
1040 if (!parent->next && !parent->prev)
1047 /* Walk to the beginning and end of the child's chain. */
1060 /* Choose the closest. */
1061 child = next_count < prev_count ? next : prev;
1063 else if (! child->next && !child->prev)
1082 parent = prev_count < next_count ? prev : next;
1086 /* Couldn't find anywhere to attach the functions,
1087 put the arc on the unplaced arc list. */
1088 unplaced_arcs[(*unplaced_arc_count)++] = arcs[index];
1092 /* Make sure we don't tie two ends together. */
1112 /* This would tie two ends together. */
1113 unplaced_arcs[(*unplaced_arc_count)++] = arcs[index];
1119 /* Must attach to the parent's prev field. */
1122 /* parent-prev and child-next */
1123 parent->prev = child;
1124 child->next = parent;
1125 arcs[index]->has_been_placed = 1;
1128 else if (parent->prev)
1130 /* Must attach to the parent's next field. */
1133 /* parent-next and child-prev */
1134 parent->next = child;
1135 child->prev = parent;
1136 arcs[index]->has_been_placed = 1;
1141 /* Can attach to either field in the parent, depends
1142 on where we've got space in the child. */
1145 /* parent-prev and child-next */
1146 parent->prev = child;
1147 child->next = parent;
1148 arcs[index]->has_been_placed = 1;
1152 /* parent-next and child-prev */
1153 parent->next = child;
1154 child->prev = parent;
1155 arcs[index]->has_been_placed = 1;
1160 /* Dump the chains of functions we've made. */
1161 for (index = 0; index < numarcs; index++)
1164 if (arcs[index]->parent->has_been_placed
1165 || arcs[index]->child->has_been_placed)
1168 sym = arcs[index]->parent;
1170 /* If this symbol isn't attached to any other
1171 symbols, then we've got a rarely used arc.
1173 Skip it for now, we'll deal with them later. */
1174 if (sym->next == NULL
1175 && sym->prev == NULL)
1178 /* Get to the start of this chain. */
1184 /* Mark it as placed. */
1185 sym->has_been_placed = 1;
1186 printf ("%s\n", sym->name);
1191 /* If we want to place all the arcs, then output those which weren't
1192 placed by the main algorithm. */
1194 for (index = 0; index < numarcs; index++)
1197 if (arcs[index]->parent->has_been_placed
1198 || arcs[index]->child->has_been_placed)
1201 sym = arcs[index]->parent;
1203 sym->has_been_placed = 1;
1204 printf ("%s\n", sym->name);
1208 /* Print a suggested .o ordering for files on a link line based
1209 on profiling information. This uses the function placement
1210 code for the bulk of its work. */
1212 struct function_map {
1213 char *function_name;
1218 DEFUN_VOID (cg_print_file_ordering)
1220 unsigned long scratch_arc_count, index;
1222 extern struct function_map *symbol_map;
1223 extern int symbol_map_count;
1226 scratch_arc_count = 0;
1228 scratch_arcs = (Arc **) xmalloc (numarcs * sizeof (Arc *));
1229 for (index = 0; index < numarcs; index++)
1231 if (! arcs[index]->parent->mapped
1232 || ! arcs[index]->child->mapped)
1233 arcs[index]->has_been_placed = 1;
1236 order_and_dump_functions_by_arcs (arcs, numarcs, 0,
1237 scratch_arcs, &scratch_arc_count);
1239 /* Output .o's not handled by the main placement algorithm. */
1240 for (index = 0; index < symtab.len; index++)
1242 if (symtab.base[index].mapped
1243 && ! symtab.base[index].has_been_placed)
1244 printf ("%s\n", symtab.base[index].name);
1247 /* Now output any .o's that didn't have any text symbols. */
1249 for (index = 0; index < symbol_map_count; index++)
1253 /* Don't bother searching if this symbol is the
1254 same as the previous one. */
1255 if (last && !strcmp (last, symbol_map[index].file_name))
1258 for (index2 = 0; index2 < symtab.len; index2++)
1260 if (! symtab.base[index2].mapped)
1263 if (!strcmp (symtab.base[index2].name, symbol_map[index].file_name))
1267 /* If we didn't find it in the symbol table, then it must be a .o
1268 with no text symbols. Output it last. */
1269 if (index2 == symtab.len)
1270 printf ("%s\n", symbol_map[index].file_name);
1271 last = symbol_map[index].file_name;