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 %7lu"
90 : "%-6.6s %5.1f %7.2f %7.2f %7lu", 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 ("+%-7lu", 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 unsigned long left_calls = left->ncalls + left->cg.self_calls;
115 unsigned 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 %7lu"
180 : "%6.6s %5.5s %7.2f %7.2f %7lu",
181 "", "", member->cg.prop.self / hz, member->cg.prop.child / hz,
183 if (member->cg.self_calls != 0)
185 printf ("+%-7lu", 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 %lu/%lu\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 %lu/%lu\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 %7lu %7.7s "
368 : "%6.6s %5.5s %7.7s %7.7s %7lu %7.7s ",
376 /* regular parent of child: */
377 printf (bsd_style_output
378 ? "%6.6s %5.5s %7.2f %11.2f %7lu/%-7lu "
379 : "%6.6s %5.5s %7.2f %7.2f %7lu/%-7lu ",
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 %7lu %7.7s "
441 : "%6.6s %5.5s %7.7s %7.7s %7lu %7.7s ",
442 "", "", "", "", arc->count, "");
448 /* regular child of parent: */
449 printf (bsd_style_output
450 ? "%6.6s %5.5s %7.2f %11.2f %7lu/%-7lu "
451 : "%6.6s %5.5s %7.2f %7.2f %7lu/%-7lu ",
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 (" %7lu", np->ncalls);
476 if (np->cg.self_calls != 0)
478 printf ("+%-7lu ", 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)
561 unsigned int nnames, todo, i, j;
562 int col, starting_col;
563 Sym **name_sorted_syms, *sym;
564 const char *filename;
566 int column_width = (output_width - 1) / 3; /* don't write in last col! */
568 * Now, sort regular function name alphabetically to create an
571 name_sorted_syms = (Sym **) xmalloc ((symtab.len + num_cycles) * sizeof (Sym *));
572 for (index = 0, nnames = 0; index < symtab.len; index++)
574 if (ignore_zeros && symtab.base[index].ncalls == 0
575 && symtab.base[index].hist.time == 0)
579 name_sorted_syms[nnames++] = &symtab.base[index];
581 qsort (name_sorted_syms, nnames, sizeof (Sym *), cmp_name);
582 for (index = 1, todo = nnames; index <= num_cycles; index++)
584 name_sorted_syms[todo++] = &cycle_header[index];
587 printf (_("Index by function name\n\n"));
588 index = (todo + 2) / 3;
589 for (i = 0; i < index; i++)
593 for (j = i; j < todo; j += index)
595 sym = name_sorted_syms[j];
596 if (sym->cg.print_flag)
598 sprintf (buf, "[%d]", sym->cg.index);
602 sprintf (buf, "(%d)", sym->cg.index);
606 if (bsd_style_output)
608 printf ("%6.6s %-19.19s", buf, sym->name);
613 for (; col < starting_col + 5; ++col)
617 printf (" %s ", buf);
618 col += print_name_only (sym);
619 if (!line_granularity && sym->is_static && sym->file)
621 filename = sym->file->name;
624 filename = strrchr (filename, '/');
631 filename = sym->file->name;
634 printf (" (%s)", filename);
635 col += strlen (filename) + 3;
641 if (bsd_style_output)
643 printf ("%6.6s ", buf);
644 sprintf (buf, _("<cycle %d>"), sym->cg.cyc.num);
645 printf ("%-19.19s", buf);
650 for (; col < starting_col + 5; ++col)
652 printf (" %s ", buf);
653 sprintf (buf, _("<cycle %d>"), sym->cg.cyc.num);
658 starting_col += column_width;
662 free (name_sorted_syms);
665 /* Compare two arcs based on their usage counts. We want to sort
666 in descending order. */
668 DEFUN (cmp_arc_count, (left, right), const PTR left AND const PTR right)
670 const Arc **npp1 = (const Arc **) left;
671 const Arc **npp2 = (const Arc **) right;
673 if ((*npp1)->count > (*npp2)->count)
675 else if ((*npp1)->count < (*npp2)->count)
681 /* Compare two funtions based on their usage counts. We want to sort
682 in descending order. */
684 DEFUN (cmp_fun_nuses, (left, right), const PTR left AND const PTR right)
686 const Sym **npp1 = (const Sym **) left;
687 const Sym **npp2 = (const Sym **) right;
689 if ((*npp1)->nuses > (*npp2)->nuses)
691 else if ((*npp1)->nuses < (*npp2)->nuses)
697 /* Print a suggested function ordering based on the profiling data.
699 We perform 4 major steps when ordering functions:
701 * Group unused functions together and place them at the
702 end of the function order.
704 * Search the highest use arcs (those which account for 90% of
705 the total arc count) for functions which have several parents.
707 Group those with the most call sites together (currently the
708 top 1.25% which have at least five different call sites).
710 These are emitted at the start of the function order.
712 * Use a greedy placement algorithm to place functions which
713 occur in the top 99% of the arcs in the profile. Some provisions
714 are made to handle high usage arcs where the parent and/or
715 child has already been placed.
717 * Run the same greedy placement algorithm on the remaining
718 arcs to place the leftover functions.
721 The various "magic numbers" should (one day) be tuneable by command
722 line options. They were arrived at by benchmarking a few applications
723 with various values to see which values produced better overall function
726 Of course, profiling errors, machine limitations (PA long calls), and
727 poor cutoff values for the placement algorithm may limit the usefullness
728 of the resulting function order. Improvements would be greatly appreciated.
732 * Place the functions with many callers near the middle of the
733 list to reduce long calls.
735 * Propagate arc usage changes as functions are placed. Ie if
736 func1 and func2 are placed together, arcs to/from those arcs
737 to the same parent/child should be combined, then resort the
738 arcs to choose the next one.
740 * Implement some global positioning algorithm to place the
741 chains made by the greedy local positioning algorithm. Probably
742 by examining arcs which haven't been placed yet to tie two
745 * Take a function's size and time into account in the algorithm;
746 size in particular is important on the PA (long calls). Placing
747 many small functions onto their own page may be wise.
749 * Use better profiling information; many published algorithms
750 are based on call sequences through time, rather than just
753 * Prodecure cloning could improve performance when a small number
754 of arcs account for most of the calls to a particular function.
756 * Use relocation information to avoid moving unused functions
757 completely out of the code stream; this would avoid severe lossage
758 when the profile data bears little resemblance to actual runs.
760 * Propagation of arc usages should also improve .o link line
761 ordering which shares the same arc placement algorithm with
762 the function ordering code (in fact it is a degenerate case
763 of function ordering). */
766 DEFUN_VOID (cg_print_function_ordering)
768 unsigned long index, used, unused, scratch_index;
769 unsigned long unplaced_arc_count, high_arc_count, scratch_arc_count;
771 unsigned long long total_arcs, tmp_arcs_count;
773 unsigned long total_arcs, tmp_arcs_count;
775 Sym **unused_syms, **used_syms, **scratch_syms;
776 Arc **unplaced_arcs, **high_arcs, **scratch_arcs;
782 unplaced_arc_count = 0;
784 scratch_arc_count = 0;
786 /* First group all the unused functions together. */
787 unused_syms = (Sym **) xmalloc (symtab.len * sizeof (Sym *));
788 used_syms = (Sym **) xmalloc (symtab.len * sizeof (Sym *));
789 scratch_syms = (Sym **) xmalloc (symtab.len * sizeof (Sym *));
790 high_arcs = (Arc **) xmalloc (numarcs * sizeof (Arc *));
791 scratch_arcs = (Arc **) xmalloc (numarcs * sizeof (Arc *));
792 unplaced_arcs = (Arc **) xmalloc (numarcs * sizeof (Arc *));
794 /* Walk through all the functions; mark those which are never
795 called as placed (we'll emit them as a group later). */
796 for (index = 0, used = 0, unused = 0; index < symtab.len; index++)
798 if (symtab.base[index].ncalls == 0)
800 /* Filter out gprof generated names. */
801 if (strcmp (symtab.base[index].name, "<locore>")
802 && strcmp (symtab.base[index].name, "<hicore>"))
804 unused_syms[unused++] = &symtab.base[index];
805 symtab.base[index].has_been_placed = 1;
810 used_syms[used++] = &symtab.base[index];
811 symtab.base[index].has_been_placed = 0;
812 symtab.base[index].next = 0;
813 symtab.base[index].prev = 0;
814 symtab.base[index].nuses = 0;
818 /* Sort the arcs from most used to least used. */
819 qsort (arcs, numarcs, sizeof (Arc *), cmp_arc_count);
821 /* Compute the total arc count. Also mark arcs as unplaced.
823 Note we don't compensate for overflow if that happens!
824 Overflow is much less likely when this file is compiled
825 with GCC as it can double-wide integers via long long. */
827 for (index = 0; index < numarcs; index++)
829 total_arcs += arcs[index]->count;
830 arcs[index]->has_been_placed = 0;
833 /* We want to pull out those functions which are referenced
834 by many highly used arcs and emit them as a group. This
835 could probably use some tuning. */
837 for (index = 0; index < numarcs; index++)
839 tmp_arcs_count += arcs[index]->count;
841 /* Count how many times each parent and child are used up
842 to our threshhold of arcs (90%). */
843 if ((double)tmp_arcs_count / (double)total_arcs > 0.90)
846 arcs[index]->child->nuses++;
849 /* Now sort a temporary symbol table based on the number of
850 times each function was used in the highest used arcs. */
851 memcpy (scratch_syms, used_syms, used * sizeof (Sym *));
852 qsort (scratch_syms, used, sizeof (Sym *), cmp_fun_nuses);
854 /* Now pick out those symbols we're going to emit as
855 a group. We take up to 1.25% of the used symbols. */
856 for (index = 0; index < used / 80; index++)
858 Sym *sym = scratch_syms[index];
861 /* If we hit symbols that aren't used from many call sites,
862 then we can quit. We choose five as the low limit for
863 no particular reason. */
867 /* We're going to need the arcs between these functions.
868 Unfortunately, we don't know all these functions
869 until we're done. So we keep track of all the arcs
870 to the functions we care about, then prune out those
871 which are uninteresting.
873 An interesting variation would be to quit when we found
874 multi-call site functions which account for some percentage
877 arc = sym->cg.children;
880 if (arc->parent != arc->child)
881 scratch_arcs[scratch_arc_count++] = arc;
882 arc->has_been_placed = 1;
883 arc = arc->next_child;
886 arc = sym->cg.parents;
889 if (arc->parent != arc->child)
890 scratch_arcs[scratch_arc_count++] = arc;
891 arc->has_been_placed = 1;
892 arc = arc->next_parent;
895 /* Keep track of how many symbols we're going to place. */
896 scratch_index = index;
898 /* A lie, but it makes identifying these functions easier
900 sym->has_been_placed = 1;
903 /* Now walk through the temporary arcs and copy those we care about
904 into the high arcs array. */
905 for (index = 0; index < scratch_arc_count; index++)
907 Arc *arc = scratch_arcs[index];
909 /* If this arc refers to highly used functions, then
910 then we want to keep it. */
911 if (arc->child->has_been_placed
912 && arc->parent->has_been_placed)
914 high_arcs[high_arc_count++] = scratch_arcs[index];
916 /* We need to turn of has_been_placed since we're going to
917 use the main arc placement algorithm on these arcs. */
918 arc->child->has_been_placed = 0;
919 arc->parent->has_been_placed = 0;
923 /* Dump the multi-site high usage functions which are not going
924 to be ordered by the main ordering algorithm. */
925 for (index = 0; index < scratch_index; index++)
927 if (scratch_syms[index]->has_been_placed)
928 printf ("%s\n", scratch_syms[index]->name);
931 /* Now we can order the multi-site high use functions based on the
932 arcs between them. */
933 qsort (high_arcs, high_arc_count, sizeof (Arc *), cmp_arc_count);
934 order_and_dump_functions_by_arcs (high_arcs, high_arc_count, 1,
935 unplaced_arcs, &unplaced_arc_count);
937 /* Order and dump the high use functions left, these typically
938 have only a few call sites. */
939 order_and_dump_functions_by_arcs (arcs, numarcs, 0,
940 unplaced_arcs, &unplaced_arc_count);
942 /* Now place the rarely used functions. */
943 order_and_dump_functions_by_arcs (unplaced_arcs, unplaced_arc_count, 1,
944 scratch_arcs, &scratch_arc_count);
946 /* Output any functions not emitted by the order_and_dump calls. */
947 for (index = 0; index < used; index++)
948 if (used_syms[index]->has_been_placed == 0)
949 printf("%s\n", used_syms[index]->name);
951 /* Output the unused functions. */
952 for (index = 0; index < unused; index++)
953 printf("%s\n", unused_syms[index]->name);
955 unused_syms = (Sym **) xmalloc (symtab.len * sizeof (Sym *));
956 used_syms = (Sym **) xmalloc (symtab.len * sizeof (Sym *));
957 scratch_syms = (Sym **) xmalloc (symtab.len * sizeof (Sym *));
958 high_arcs = (Arc **) xmalloc (numarcs * sizeof (Arc *));
959 scratch_arcs = (Arc **) xmalloc (numarcs * sizeof (Arc *));
960 unplaced_arcs = (Arc **) xmalloc (numarcs * sizeof (Arc *));
967 free (unplaced_arcs);
970 /* Place functions based on the arcs in ARCS with NUMARCS entries;
971 place unused arcs into UNPLACED_ARCS/UNPLACED_ARC_COUNT.
973 If ALL is nonzero, then place all functions referenced by ARCS,
974 else only place those referenced in the top 99% of the arcs in ARCS. */
978 order_and_dump_functions_by_arcs (arcs, numarcs, all,
979 unplaced_arcs, unplaced_arc_count)
981 unsigned long numarcs;
984 unsigned long *unplaced_arc_count;
987 unsigned long long tmp_arcs, total_arcs;
989 unsigned long tmp_arcs, total_arcs;
993 /* If needed, compute the total arc count.
995 Note we don't compensate for overflow if that happens! */
999 for (index = 0; index < numarcs; index++)
1000 total_arcs += arcs[index]->count;
1006 for (index = 0; index < numarcs; index++)
1009 Sym *child, *parent;
1011 tmp_arcs += arcs[index]->count;
1013 /* Ignore this arc if it's already been placed. */
1014 if (arcs[index]->has_been_placed)
1017 child = arcs[index]->child;
1018 parent = arcs[index]->parent;
1020 /* If we're not using all arcs, and this is a rarely used
1021 arc, then put it on the unplaced_arc list. Similarly
1022 if both the parent and child of this arc have been placed. */
1023 if ((! all && (double)tmp_arcs / (double)total_arcs > MOST)
1024 || child->has_been_placed || parent->has_been_placed)
1026 unplaced_arcs[(*unplaced_arc_count)++] = arcs[index];
1030 /* If all slots in the parent and child are full, then there isn't
1031 anything we can do right now. We'll place this arc on the
1032 unplaced arc list in the hope that a global positioning
1033 algorithm can use it to place function chains. */
1034 if (parent->next && parent->prev && child->next && child->prev)
1036 unplaced_arcs[(*unplaced_arc_count)++] = arcs[index];
1040 /* If the parent is unattached, then find the closest
1041 place to attach it onto child's chain. Similarly
1042 for the opposite case. */
1043 if (!parent->next && !parent->prev)
1050 /* Walk to the beginning and end of the child's chain. */
1063 /* Choose the closest. */
1064 child = next_count < prev_count ? next : prev;
1066 else if (! child->next && !child->prev)
1085 parent = prev_count < next_count ? prev : next;
1089 /* Couldn't find anywhere to attach the functions,
1090 put the arc on the unplaced arc list. */
1091 unplaced_arcs[(*unplaced_arc_count)++] = arcs[index];
1095 /* Make sure we don't tie two ends together. */
1115 /* This would tie two ends together. */
1116 unplaced_arcs[(*unplaced_arc_count)++] = arcs[index];
1122 /* Must attach to the parent's prev field. */
1125 /* parent-prev and child-next */
1126 parent->prev = child;
1127 child->next = parent;
1128 arcs[index]->has_been_placed = 1;
1131 else if (parent->prev)
1133 /* Must attach to the parent's next field. */
1136 /* parent-next and child-prev */
1137 parent->next = child;
1138 child->prev = parent;
1139 arcs[index]->has_been_placed = 1;
1144 /* Can attach to either field in the parent, depends
1145 on where we've got space in the child. */
1148 /* parent-prev and child-next */
1149 parent->prev = child;
1150 child->next = parent;
1151 arcs[index]->has_been_placed = 1;
1155 /* parent-next and child-prev */
1156 parent->next = child;
1157 child->prev = parent;
1158 arcs[index]->has_been_placed = 1;
1163 /* Dump the chains of functions we've made. */
1164 for (index = 0; index < numarcs; index++)
1167 if (arcs[index]->parent->has_been_placed
1168 || arcs[index]->child->has_been_placed)
1171 sym = arcs[index]->parent;
1173 /* If this symbol isn't attached to any other
1174 symbols, then we've got a rarely used arc.
1176 Skip it for now, we'll deal with them later. */
1177 if (sym->next == NULL
1178 && sym->prev == NULL)
1181 /* Get to the start of this chain. */
1187 /* Mark it as placed. */
1188 sym->has_been_placed = 1;
1189 printf ("%s\n", sym->name);
1194 /* If we want to place all the arcs, then output those which weren't
1195 placed by the main algorithm. */
1197 for (index = 0; index < numarcs; index++)
1200 if (arcs[index]->parent->has_been_placed
1201 || arcs[index]->child->has_been_placed)
1204 sym = arcs[index]->parent;
1206 sym->has_been_placed = 1;
1207 printf ("%s\n", sym->name);
1211 /* Print a suggested .o ordering for files on a link line based
1212 on profiling information. This uses the function placement
1213 code for the bulk of its work. */
1215 struct function_map {
1216 char *function_name;
1221 DEFUN_VOID (cg_print_file_ordering)
1223 unsigned long scratch_arc_count, index;
1225 extern struct function_map *symbol_map;
1226 extern unsigned int symbol_map_count;
1229 scratch_arc_count = 0;
1231 scratch_arcs = (Arc **) xmalloc (numarcs * sizeof (Arc *));
1232 for (index = 0; index < numarcs; index++)
1234 if (! arcs[index]->parent->mapped
1235 || ! arcs[index]->child->mapped)
1236 arcs[index]->has_been_placed = 1;
1239 order_and_dump_functions_by_arcs (arcs, numarcs, 0,
1240 scratch_arcs, &scratch_arc_count);
1242 /* Output .o's not handled by the main placement algorithm. */
1243 for (index = 0; index < symtab.len; index++)
1245 if (symtab.base[index].mapped
1246 && ! symtab.base[index].has_been_placed)
1247 printf ("%s\n", symtab.base[index].name);
1250 /* Now output any .o's that didn't have any text symbols. */
1252 for (index = 0; index < symbol_map_count; index++)
1254 unsigned int index2;
1256 /* Don't bother searching if this symbol is the
1257 same as the previous one. */
1258 if (last && !strcmp (last, symbol_map[index].file_name))
1261 for (index2 = 0; index2 < symtab.len; index2++)
1263 if (! symtab.base[index2].mapped)
1266 if (!strcmp (symtab.base[index2].name, symbol_map[index].file_name))
1270 /* If we didn't find it in the symbol table, then it must be a .o
1271 with no text symbols. Output it last. */
1272 if (index2 == symtab.len)
1273 printf ("%s\n", symbol_map[index].file_name);
1274 last = symbol_map[index].file_name;