fuchsia / third_party / binutils-gdb / 6fbfdb27bc16883fe49b1bb9fb515729a24f2815 / . / gprof / cg_print.c

/* cg_print.c - Print routines for displaying call graphs. | |

Copyright (C) 2000-2016 Free Software Foundation, Inc. | |

This file is part of GNU Binutils. | |

This program is free software; you can redistribute it and/or modify | |

it under the terms of the GNU General Public License as published by | |

the Free Software Foundation; either version 3 of the License, or | |

(at your option) any later version. | |

This program is distributed in the hope that it will be useful, | |

but WITHOUT ANY WARRANTY; without even the implied warranty of | |

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |

GNU General Public License for more details. | |

You should have received a copy of the GNU General Public License | |

along with this program; if not, write to the Free Software | |

Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA | |

02110-1301, USA. */ | |

#include "gprof.h" | |

#include "libiberty.h" | |

#include "filenames.h" | |

#include "search_list.h" | |

#include "source.h" | |

#include "symtab.h" | |

#include "cg_arcs.h" | |

#include "cg_print.h" | |

#include "hist.h" | |

#include "utils.h" | |

#include "corefile.h" | |

/* Return value of comparison functions used to sort tables. */ | |

#define LESSTHAN -1 | |

#define EQUALTO 0 | |

#define GREATERTHAN 1 | |

static void print_header (void); | |

static void print_cycle (Sym *); | |

static int cmp_member (Sym *, Sym *); | |

static void sort_members (Sym *); | |

static void print_members (Sym *); | |

static int cmp_arc (Arc *, Arc *); | |

static void sort_parents (Sym *); | |

static void print_parents (Sym *); | |

static void sort_children (Sym *); | |

static void print_children (Sym *); | |

static void print_line (Sym *); | |

static int cmp_name (const PTR, const PTR); | |

static int cmp_arc_count (const PTR, const PTR); | |

static int cmp_fun_nuses (const PTR, const PTR); | |

static void order_and_dump_functions_by_arcs | |

(Arc **, unsigned long, int, Arc **, unsigned long *); | |

/* Declarations of automatically generated functions to output blurbs. */ | |

extern void bsd_callg_blurb (FILE * fp); | |

extern void fsf_callg_blurb (FILE * fp); | |

double print_time = 0.0; | |

static void | |

print_header (void) | |

{ | |

if (first_output) | |

first_output = FALSE; | |

else | |

printf ("\f\n"); | |

if (!bsd_style_output) | |

{ | |

if (print_descriptions) | |

printf (_("\t\t Call graph (explanation follows)\n\n")); | |

else | |

printf (_("\t\t\tCall graph\n\n")); | |

} | |

printf (_("\ngranularity: each sample hit covers %ld byte(s)"), | |

(long) hist_scale * (long) sizeof (UNIT)); | |

if (print_time > 0.0) | |

printf (_(" for %.2f%% of %.2f seconds\n\n"), | |

100.0 / print_time, print_time / hz); | |

else | |

{ | |

printf (_(" no time propagated\n\n")); | |

/* This doesn't hurt, since all the numerators will be 0.0. */ | |

print_time = 1.0; | |

} | |

if (bsd_style_output) | |

{ | |

printf ("%6.6s %5.5s %7.7s %11.11s %7.7s/%-7.7s %-8.8s\n", | |

"", "", "", "", _("called"), _("total"), _("parents")); | |

printf ("%-6.6s %5.5s %7.7s %11.11s %7.7s+%-7.7s %-8.8s\t%5.5s\n", | |

_("index"), | |

/* xgettext:no-c-format */ | |

_("%time"), | |

_("self"), _("descendants"), _("called"), _("self"), | |

_("name"), _("index")); | |

printf ("%6.6s %5.5s %7.7s %11.11s %7.7s/%-7.7s %-8.8s\n", | |

"", "", "", "", _("called"), _("total"), _("children")); | |

printf ("\n"); | |

} | |

else | |

{ | |

printf (_("index %% time self children called name\n")); | |

} | |

} | |

/* Print a cycle header. */ | |

static void | |

print_cycle (Sym *cyc) | |

{ | |

char buf[BUFSIZ]; | |

sprintf (buf, "[%d]", cyc->cg.index); | |

printf (bsd_style_output | |

? "%-6.6s %5.1f %7.2f %11.2f %7lu" | |

: "%-6.6s %5.1f %7.2f %7.2f %7lu", buf, | |

100 * (cyc->cg.prop.self + cyc->cg.prop.child) / print_time, | |

cyc->cg.prop.self / hz, cyc->cg.prop.child / hz, cyc->ncalls); | |

if (cyc->cg.self_calls != 0) | |

printf ("+%-7lu", cyc->cg.self_calls); | |

else | |

printf (" %7.7s", ""); | |

printf (_(" <cycle %d as a whole> [%d]\n"), cyc->cg.cyc.num, cyc->cg.index); | |

} | |

/* Compare LEFT and RIGHT membmer. Major comparison key is | |

CG.PROP.SELF+CG.PROP.CHILD, secondary key is NCALLS+CG.SELF_CALLS. */ | |

static int | |

cmp_member (Sym *left, Sym *right) | |

{ | |

double left_time = left->cg.prop.self + left->cg.prop.child; | |

double right_time = right->cg.prop.self + right->cg.prop.child; | |

unsigned long left_calls = left->ncalls + left->cg.self_calls; | |

unsigned long right_calls = right->ncalls + right->cg.self_calls; | |

if (left_time > right_time) | |

return GREATERTHAN; | |

if (left_time < right_time) | |

return LESSTHAN; | |

if (left_calls > right_calls) | |

return GREATERTHAN; | |

if (left_calls < right_calls) | |

return LESSTHAN; | |

return EQUALTO; | |

} | |

/* Sort members of a cycle. */ | |

static void | |

sort_members (Sym *cyc) | |

{ | |

Sym *todo, *doing, *prev; | |

/* Detach cycle members from cyclehead, | |

and insertion sort them back on. */ | |

todo = cyc->cg.cyc.next; | |

cyc->cg.cyc.next = 0; | |

for (doing = todo; doing != NULL; doing = todo) | |

{ | |

todo = doing->cg.cyc.next; | |

for (prev = cyc; prev->cg.cyc.next; prev = prev->cg.cyc.next) | |

{ | |

if (cmp_member (doing, prev->cg.cyc.next) == GREATERTHAN) | |

break; | |

} | |

doing->cg.cyc.next = prev->cg.cyc.next; | |

prev->cg.cyc.next = doing; | |

} | |

} | |

/* Print the members of a cycle. */ | |

static void | |

print_members (Sym *cyc) | |

{ | |

Sym *member; | |

sort_members (cyc); | |

for (member = cyc->cg.cyc.next; member; member = member->cg.cyc.next) | |

{ | |

printf (bsd_style_output | |

? "%6.6s %5.5s %7.2f %11.2f %7lu" | |

: "%6.6s %5.5s %7.2f %7.2f %7lu", | |

"", "", member->cg.prop.self / hz, member->cg.prop.child / hz, | |

member->ncalls); | |

if (member->cg.self_calls != 0) | |

printf ("+%-7lu", member->cg.self_calls); | |

else | |

printf (" %7.7s", ""); | |

printf (" "); | |

print_name (member); | |

printf ("\n"); | |

} | |

} | |

/* Compare two arcs to/from the same child/parent. | |

- if one arc is a self arc, it's least. | |

- if one arc is within a cycle, it's less than. | |

- if both arcs are within a cycle, compare arc counts. | |

- if neither arc is within a cycle, compare with | |

time + child_time as major key | |

arc count as minor key. */ | |

static int | |

cmp_arc (Arc *left, Arc *right) | |

{ | |

Sym *left_parent = left->parent; | |

Sym *left_child = left->child; | |

Sym *right_parent = right->parent; | |

Sym *right_child = right->child; | |

double left_time, right_time; | |

DBG (TIMEDEBUG, | |

printf ("[cmp_arc] "); | |

print_name (left_parent); | |

printf (" calls "); | |

print_name (left_child); | |

printf (" %f + %f %lu/%lu\n", left->time, left->child_time, | |

left->count, left_child->ncalls); | |

printf ("[cmp_arc] "); | |

print_name (right_parent); | |

printf (" calls "); | |

print_name (right_child); | |

printf (" %f + %f %lu/%lu\n", right->time, right->child_time, | |

right->count, right_child->ncalls); | |

printf ("\n"); | |

); | |

if (left_parent == left_child) | |

return LESSTHAN; /* Left is a self call. */ | |

if (right_parent == right_child) | |

return GREATERTHAN; /* Right is a self call. */ | |

if (left_parent->cg.cyc.num != 0 && left_child->cg.cyc.num != 0 | |

&& left_parent->cg.cyc.num == left_child->cg.cyc.num) | |

{ | |

/* Left is a call within a cycle. */ | |

if (right_parent->cg.cyc.num != 0 && right_child->cg.cyc.num != 0 | |

&& right_parent->cg.cyc.num == right_child->cg.cyc.num) | |

{ | |

/* Right is a call within the cycle, too. */ | |

if (left->count < right->count) | |

return LESSTHAN; | |

if (left->count > right->count) | |

return GREATERTHAN; | |

return EQUALTO; | |

} | |

else | |

{ | |

/* Right isn't a call within the cycle. */ | |

return LESSTHAN; | |

} | |

} | |

else | |

{ | |

/* Left isn't a call within a cycle. */ | |

if (right_parent->cg.cyc.num != 0 && right_child->cg.cyc.num != 0 | |

&& right_parent->cg.cyc.num == right_child->cg.cyc.num) | |

{ | |

/* Right is a call within a cycle. */ | |

return GREATERTHAN; | |

} | |

else | |

{ | |

/* Neither is a call within a cycle. */ | |

left_time = left->time + left->child_time; | |

right_time = right->time + right->child_time; | |

if (left_time < right_time) | |

return LESSTHAN; | |

if (left_time > right_time) | |

return GREATERTHAN; | |

if (left->count < right->count) | |

return LESSTHAN; | |

if (left->count > right->count) | |

return GREATERTHAN; | |

return EQUALTO; | |

} | |

} | |

} | |

static void | |

sort_parents (Sym * child) | |

{ | |

Arc *arc, *detached, sorted, *prev; | |

/* Unlink parents from child, then insertion sort back on to | |

sorted's parents. | |

*arc the arc you have detached and are inserting. | |

*detached the rest of the arcs to be sorted. | |

sorted arc list onto which you insertion sort. | |

*prev arc before the arc you are comparing. */ | |

sorted.next_parent = 0; | |

for (arc = child->cg.parents; arc; arc = detached) | |

{ | |

detached = arc->next_parent; | |

/* Consider *arc as disconnected; insert it into sorted. */ | |

for (prev = &sorted; prev->next_parent; prev = prev->next_parent) | |

{ | |

if (cmp_arc (arc, prev->next_parent) != GREATERTHAN) | |

break; | |

} | |

arc->next_parent = prev->next_parent; | |

prev->next_parent = arc; | |

} | |

/* Reattach sorted arcs to child. */ | |

child->cg.parents = sorted.next_parent; | |

} | |

static void | |

print_parents (Sym *child) | |

{ | |

Sym *parent; | |

Arc *arc; | |

Sym *cycle_head; | |

if (child->cg.cyc.head != 0) | |

cycle_head = child->cg.cyc.head; | |

else | |

cycle_head = child; | |

if (!child->cg.parents) | |

{ | |

printf (bsd_style_output | |

? _("%6.6s %5.5s %7.7s %11.11s %7.7s %7.7s <spontaneous>\n") | |

: _("%6.6s %5.5s %7.7s %7.7s %7.7s %7.7s <spontaneous>\n"), | |

"", "", "", "", "", ""); | |

return; | |

} | |

sort_parents (child); | |

for (arc = child->cg.parents; arc; arc = arc->next_parent) | |

{ | |

parent = arc->parent; | |

if (child == parent || (child->cg.cyc.num != 0 | |

&& parent->cg.cyc.num == child->cg.cyc.num)) | |

{ | |

/* Selfcall or call among siblings. */ | |

printf (bsd_style_output | |

? "%6.6s %5.5s %7.7s %11.11s %7lu %7.7s " | |

: "%6.6s %5.5s %7.7s %7.7s %7lu %7.7s ", | |

"", "", "", "", | |

arc->count, ""); | |

print_name (parent); | |

printf ("\n"); | |

} | |

else | |

{ | |

/* Regular parent of child. */ | |

printf (bsd_style_output | |

? "%6.6s %5.5s %7.2f %11.2f %7lu/%-7lu " | |

: "%6.6s %5.5s %7.2f %7.2f %7lu/%-7lu ", | |

"", "", | |

arc->time / hz, arc->child_time / hz, | |

arc->count, cycle_head->ncalls); | |

print_name (parent); | |

printf ("\n"); | |

} | |

} | |

} | |

static void | |

sort_children (Sym *parent) | |

{ | |

Arc *arc, *detached, sorted, *prev; | |

/* Unlink children from parent, then insertion sort back on to | |

sorted's children. | |

*arc the arc you have detached and are inserting. | |

*detached the rest of the arcs to be sorted. | |

sorted arc list onto which you insertion sort. | |

*prev arc before the arc you are comparing. */ | |

sorted.next_child = 0; | |

for (arc = parent->cg.children; arc; arc = detached) | |

{ | |

detached = arc->next_child; | |

/* Consider *arc as disconnected; insert it into sorted. */ | |

for (prev = &sorted; prev->next_child; prev = prev->next_child) | |

{ | |

if (cmp_arc (arc, prev->next_child) != LESSTHAN) | |

break; | |

} | |

arc->next_child = prev->next_child; | |

prev->next_child = arc; | |

} | |

/* Reattach sorted children to parent. */ | |

parent->cg.children = sorted.next_child; | |

} | |

static void | |

print_children (Sym *parent) | |

{ | |

Sym *child; | |

Arc *arc; | |

sort_children (parent); | |

arc = parent->cg.children; | |

for (arc = parent->cg.children; arc; arc = arc->next_child) | |

{ | |

child = arc->child; | |

if (child == parent || (child->cg.cyc.num != 0 | |

&& child->cg.cyc.num == parent->cg.cyc.num)) | |

{ | |

/* Self call or call to sibling. */ | |

printf (bsd_style_output | |

? "%6.6s %5.5s %7.7s %11.11s %7lu %7.7s " | |

: "%6.6s %5.5s %7.7s %7.7s %7lu %7.7s ", | |

"", "", "", "", arc->count, ""); | |

print_name (child); | |

printf ("\n"); | |

} | |

else | |

{ | |

/* Regular child of parent. */ | |

printf (bsd_style_output | |

? "%6.6s %5.5s %7.2f %11.2f %7lu/%-7lu " | |

: "%6.6s %5.5s %7.2f %7.2f %7lu/%-7lu ", | |

"", "", | |

arc->time / hz, arc->child_time / hz, | |

arc->count, child->cg.cyc.head->ncalls); | |

print_name (child); | |

printf ("\n"); | |

} | |

} | |

} | |

static void | |

print_line (Sym *np) | |

{ | |

char buf[BUFSIZ]; | |

sprintf (buf, "[%d]", np->cg.index); | |

printf (bsd_style_output | |

? "%-6.6s %5.1f %7.2f %11.2f" | |

: "%-6.6s %5.1f %7.2f %7.2f", buf, | |

100 * (np->cg.prop.self + np->cg.prop.child) / print_time, | |

np->cg.prop.self / hz, np->cg.prop.child / hz); | |

if ((np->ncalls + np->cg.self_calls) != 0) | |

{ | |

printf (" %7lu", np->ncalls); | |

if (np->cg.self_calls != 0) | |

printf ("+%-7lu ", np->cg.self_calls); | |

else | |

printf (" %7.7s ", ""); | |

} | |

else | |

{ | |

printf (" %7.7s %7.7s ", "", ""); | |

} | |

print_name (np); | |

printf ("\n"); | |

} | |

/* Print dynamic call graph. */ | |

void | |

cg_print (Sym ** timesortsym) | |

{ | |

unsigned int sym_index; | |

Sym *parent; | |

if (print_descriptions && bsd_style_output) | |

bsd_callg_blurb (stdout); | |

print_header (); | |

for (sym_index = 0; sym_index < symtab.len + num_cycles; ++sym_index) | |

{ | |

parent = timesortsym[sym_index]; | |

if ((ignore_zeros && parent->ncalls == 0 | |

&& parent->cg.self_calls == 0 && parent->cg.prop.self == 0 | |

&& parent->cg.prop.child == 0) | |

|| !parent->cg.print_flag | |

|| (line_granularity && ! parent->is_func)) | |

continue; | |

if (!parent->name && parent->cg.cyc.num != 0) | |

{ | |

/* Cycle header. */ | |

print_cycle (parent); | |

print_members (parent); | |

} | |

else | |

{ | |

print_parents (parent); | |

print_line (parent); | |

print_children (parent); | |

} | |

if (bsd_style_output) | |

printf ("\n"); | |

printf ("-----------------------------------------------\n"); | |

if (bsd_style_output) | |

printf ("\n"); | |

} | |

free (timesortsym); | |

if (print_descriptions && !bsd_style_output) | |

fsf_callg_blurb (stdout); | |

} | |

static int | |

cmp_name (const PTR left, const PTR right) | |

{ | |

const Sym **npp1 = (const Sym **) left; | |

const Sym **npp2 = (const Sym **) right; | |

return strcmp ((*npp1)->name, (*npp2)->name); | |

} | |

void | |

cg_print_index (void) | |

{ | |

unsigned int sym_index; | |

unsigned int nnames, todo, i, j; | |

int col, starting_col; | |

Sym **name_sorted_syms, *sym; | |

const char *filename; | |

char buf[20]; | |

int column_width = (output_width - 1) / 3; /* Don't write in last col! */ | |

/* Now, sort regular function name | |

alphabetically to create an index. */ | |

name_sorted_syms = (Sym **) xmalloc ((symtab.len + num_cycles) * sizeof (Sym *)); | |

for (sym_index = 0, nnames = 0; sym_index < symtab.len; sym_index++) | |

{ | |

if (ignore_zeros && symtab.base[sym_index].ncalls == 0 | |

&& symtab.base[sym_index].hist.time == 0) | |

continue; | |

name_sorted_syms[nnames++] = &symtab.base[sym_index]; | |

} | |

qsort (name_sorted_syms, nnames, sizeof (Sym *), cmp_name); | |

for (sym_index = 1, todo = nnames; sym_index <= num_cycles; sym_index++) | |

name_sorted_syms[todo++] = &cycle_header[sym_index]; | |

printf ("\f\n"); | |

printf (_("Index by function name\n\n")); | |

sym_index = (todo + 2) / 3; | |

for (i = 0; i < sym_index; i++) | |

{ | |

col = 0; | |

starting_col = 0; | |

for (j = i; j < todo; j += sym_index) | |

{ | |

sym = name_sorted_syms[j]; | |

if (sym->cg.print_flag) | |

sprintf (buf, "[%d]", sym->cg.index); | |

else | |

sprintf (buf, "(%d)", sym->cg.index); | |

if (j < nnames) | |

{ | |

if (bsd_style_output) | |

{ | |

printf ("%6.6s %-19.19s", buf, sym->name); | |

} | |

else | |

{ | |

col += strlen (buf); | |

for (; col < starting_col + 5; ++col) | |

putchar (' '); | |

printf (" %s ", buf); | |

col += print_name_only (sym); | |

if (!line_granularity && sym->is_static && sym->file) | |

{ | |

filename = sym->file->name; | |

if (!print_path) | |

{ | |

filename = strrchr (filename, '/'); | |

if (filename) | |

++filename; | |

else | |

filename = sym->file->name; | |

} | |

printf (" (%s)", filename); | |

col += strlen (filename) + 3; | |

} | |

} | |

} | |

else | |

{ | |

if (bsd_style_output) | |

{ | |

printf ("%6.6s ", buf); | |

sprintf (buf, _("<cycle %d>"), sym->cg.cyc.num); | |

printf ("%-19.19s", buf); | |

} | |

else | |

{ | |

col += strlen (buf); | |

for (; col < starting_col + 5; ++col) | |

putchar (' '); | |

printf (" %s ", buf); | |

sprintf (buf, _("<cycle %d>"), sym->cg.cyc.num); | |

printf ("%s", buf); | |

col += strlen (buf); | |

} | |

} | |

starting_col += column_width; | |

} | |

printf ("\n"); | |

} | |

free (name_sorted_syms); | |

} | |

/* Compare two arcs based on their usage counts. | |

We want to sort in descending order. */ | |

static int | |

cmp_arc_count (const PTR left, const PTR right) | |

{ | |

const Arc **npp1 = (const Arc **) left; | |

const Arc **npp2 = (const Arc **) right; | |

if ((*npp1)->count > (*npp2)->count) | |

return -1; | |

else if ((*npp1)->count < (*npp2)->count) | |

return 1; | |

else | |

return 0; | |

} | |

/* Compare two funtions based on their usage counts. | |

We want to sort in descending order. */ | |

static int | |

cmp_fun_nuses (const PTR left, const PTR right) | |

{ | |

const Sym **npp1 = (const Sym **) left; | |

const Sym **npp2 = (const Sym **) right; | |

if ((*npp1)->nuses > (*npp2)->nuses) | |

return -1; | |

else if ((*npp1)->nuses < (*npp2)->nuses) | |

return 1; | |

else | |

return 0; | |

} | |

/* Print a suggested function ordering based on the profiling data. | |

We perform 4 major steps when ordering functions: | |

* Group unused functions together and place them at the | |

end of the function order. | |

* Search the highest use arcs (those which account for 90% of | |

the total arc count) for functions which have several parents. | |

Group those with the most call sites together (currently the | |

top 1.25% which have at least five different call sites). | |

These are emitted at the start of the function order. | |

* Use a greedy placement algorithm to place functions which | |

occur in the top 99% of the arcs in the profile. Some provisions | |

are made to handle high usage arcs where the parent and/or | |

child has already been placed. | |

* Run the same greedy placement algorithm on the remaining | |

arcs to place the leftover functions. | |

The various "magic numbers" should (one day) be tuneable by command | |

line options. They were arrived at by benchmarking a few applications | |

with various values to see which values produced better overall function | |

orderings. | |

Of course, profiling errors, machine limitations (PA long calls), and | |

poor cutoff values for the placement algorithm may limit the usefullness | |

of the resulting function order. Improvements would be greatly appreciated. | |

Suggestions: | |

* Place the functions with many callers near the middle of the | |

list to reduce long calls. | |

* Propagate arc usage changes as functions are placed. Ie if | |

func1 and func2 are placed together, arcs to/from those arcs | |

to the same parent/child should be combined, then resort the | |

arcs to choose the next one. | |

* Implement some global positioning algorithm to place the | |

chains made by the greedy local positioning algorithm. Probably | |

by examining arcs which haven't been placed yet to tie two | |

chains together. | |

* Take a function's size and time into account in the algorithm; | |

size in particular is important on the PA (long calls). Placing | |

many small functions onto their own page may be wise. | |

* Use better profiling information; many published algorithms | |

are based on call sequences through time, rather than just | |

arc counts. | |

* Prodecure cloning could improve performance when a small number | |

of arcs account for most of the calls to a particular function. | |

* Use relocation information to avoid moving unused functions | |

completely out of the code stream; this would avoid severe lossage | |

when the profile data bears little resemblance to actual runs. | |

* Propagation of arc usages should also improve .o link line | |

ordering which shares the same arc placement algorithm with | |

the function ordering code (in fact it is a degenerate case | |

of function ordering). */ | |

void | |

cg_print_function_ordering (void) | |

{ | |

unsigned long sym_index; | |

unsigned long arc_index; | |

unsigned long used, unused, scratch_index; | |

unsigned long unplaced_arc_count, high_arc_count, scratch_arc_count; | |

#ifdef __GNUC__ | |

unsigned long long total_arcs, tmp_arcs_count; | |

#else | |

unsigned long total_arcs, tmp_arcs_count; | |

#endif | |

Sym **unused_syms, **used_syms, **scratch_syms; | |

Arc **unplaced_arcs, **high_arcs, **scratch_arcs; | |

sym_index = 0; | |

used = 0; | |

unused = 0; | |

scratch_index = 0; | |

unplaced_arc_count = 0; | |

high_arc_count = 0; | |

scratch_arc_count = 0; | |

/* First group all the unused functions together. */ | |

unused_syms = (Sym **) xmalloc (symtab.len * sizeof (Sym *)); | |

used_syms = (Sym **) xmalloc (symtab.len * sizeof (Sym *)); | |

scratch_syms = (Sym **) xmalloc (symtab.len * sizeof (Sym *)); | |

high_arcs = (Arc **) xmalloc (numarcs * sizeof (Arc *)); | |

scratch_arcs = (Arc **) xmalloc (numarcs * sizeof (Arc *)); | |

unplaced_arcs = (Arc **) xmalloc (numarcs * sizeof (Arc *)); | |

/* Walk through all the functions; mark those which are never | |

called as placed (we'll emit them as a group later). */ | |

for (sym_index = 0, used = 0, unused = 0; sym_index < symtab.len; sym_index++) | |

{ | |

if (symtab.base[sym_index].ncalls == 0) | |

{ | |

unused_syms[unused++] = &symtab.base[sym_index]; | |

symtab.base[sym_index].has_been_placed = 1; | |

} | |

else | |

{ | |

used_syms[used++] = &symtab.base[sym_index]; | |

symtab.base[sym_index].has_been_placed = 0; | |

symtab.base[sym_index].next = 0; | |

symtab.base[sym_index].prev = 0; | |

symtab.base[sym_index].nuses = 0; | |

} | |

} | |

/* Sort the arcs from most used to least used. */ | |

qsort (arcs, numarcs, sizeof (Arc *), cmp_arc_count); | |

/* Compute the total arc count. Also mark arcs as unplaced. | |

Note we don't compensate for overflow if that happens! | |

Overflow is much less likely when this file is compiled | |

with GCC as it can double-wide integers via long long. */ | |

total_arcs = 0; | |

for (arc_index = 0; arc_index < numarcs; arc_index++) | |

{ | |

total_arcs += arcs[arc_index]->count; | |

arcs[arc_index]->has_been_placed = 0; | |

} | |

/* We want to pull out those functions which are referenced | |

by many highly used arcs and emit them as a group. This | |

could probably use some tuning. */ | |

tmp_arcs_count = 0; | |

for (arc_index = 0; arc_index < numarcs; arc_index++) | |

{ | |

tmp_arcs_count += arcs[arc_index]->count; | |

/* Count how many times each parent and child are used up | |

to our threshhold of arcs (90%). */ | |

if ((double)tmp_arcs_count / (double)total_arcs > 0.90) | |

break; | |

arcs[arc_index]->child->nuses++; | |

} | |

/* Now sort a temporary symbol table based on the number of | |

times each function was used in the highest used arcs. */ | |

memcpy (scratch_syms, used_syms, used * sizeof (Sym *)); | |

qsort (scratch_syms, used, sizeof (Sym *), cmp_fun_nuses); | |

/* Now pick out those symbols we're going to emit as | |

a group. We take up to 1.25% of the used symbols. */ | |

for (sym_index = 0; sym_index < used / 80; sym_index++) | |

{ | |

Sym *sym = scratch_syms[sym_index]; | |

Arc *arc; | |

/* If we hit symbols that aren't used from many call sites, | |

then we can quit. We choose five as the low limit for | |

no particular reason. */ | |

if (sym->nuses == 5) | |

break; | |

/* We're going to need the arcs between these functions. | |

Unfortunately, we don't know all these functions | |

until we're done. So we keep track of all the arcs | |

to the functions we care about, then prune out those | |

which are uninteresting. | |

An interesting variation would be to quit when we found | |

multi-call site functions which account for some percentage | |

of the arcs. */ | |

arc = sym->cg.children; | |

while (arc) | |

{ | |

if (arc->parent != arc->child) | |

scratch_arcs[scratch_arc_count++] = arc; | |

arc->has_been_placed = 1; | |

arc = arc->next_child; | |

} | |

arc = sym->cg.parents; | |

while (arc) | |

{ | |

if (arc->parent != arc->child) | |

scratch_arcs[scratch_arc_count++] = arc; | |

arc->has_been_placed = 1; | |

arc = arc->next_parent; | |

} | |

/* Keep track of how many symbols we're going to place. */ | |

scratch_index = sym_index; | |

/* A lie, but it makes identifying | |

these functions easier later. */ | |

sym->has_been_placed = 1; | |

} | |

/* Now walk through the temporary arcs and copy | |

those we care about into the high arcs array. */ | |

for (arc_index = 0; arc_index < scratch_arc_count; arc_index++) | |

{ | |

Arc *arc = scratch_arcs[arc_index]; | |

/* If this arc refers to highly used functions, then | |

then we want to keep it. */ | |

if (arc->child->has_been_placed | |

&& arc->parent->has_been_placed) | |

{ | |

high_arcs[high_arc_count++] = scratch_arcs[arc_index]; | |

/* We need to turn of has_been_placed since we're going to | |

use the main arc placement algorithm on these arcs. */ | |

arc->child->has_been_placed = 0; | |

arc->parent->has_been_placed = 0; | |

} | |

} | |

/* Dump the multi-site high usage functions which are not | |

going to be ordered by the main ordering algorithm. */ | |

for (sym_index = 0; sym_index < scratch_index; sym_index++) | |

{ | |

if (scratch_syms[sym_index]->has_been_placed) | |

printf ("%s\n", scratch_syms[sym_index]->name); | |

} | |

/* Now we can order the multi-site high use | |

functions based on the arcs between them. */ | |

qsort (high_arcs, high_arc_count, sizeof (Arc *), cmp_arc_count); | |

order_and_dump_functions_by_arcs (high_arcs, high_arc_count, 1, | |

unplaced_arcs, &unplaced_arc_count); | |

/* Order and dump the high use functions left, | |

these typically have only a few call sites. */ | |

order_and_dump_functions_by_arcs (arcs, numarcs, 0, | |

unplaced_arcs, &unplaced_arc_count); | |

/* Now place the rarely used functions. */ | |

order_and_dump_functions_by_arcs (unplaced_arcs, unplaced_arc_count, 1, | |

scratch_arcs, &scratch_arc_count); | |

/* Output any functions not emitted by the order_and_dump calls. */ | |

for (sym_index = 0; sym_index < used; sym_index++) | |

if (used_syms[sym_index]->has_been_placed == 0) | |

printf("%s\n", used_syms[sym_index]->name); | |

/* Output the unused functions. */ | |

for (sym_index = 0; sym_index < unused; sym_index++) | |

printf("%s\n", unused_syms[sym_index]->name); | |

unused_syms = (Sym **) xmalloc (symtab.len * sizeof (Sym *)); | |

used_syms = (Sym **) xmalloc (symtab.len * sizeof (Sym *)); | |

scratch_syms = (Sym **) xmalloc (symtab.len * sizeof (Sym *)); | |

high_arcs = (Arc **) xmalloc (numarcs * sizeof (Arc *)); | |

scratch_arcs = (Arc **) xmalloc (numarcs * sizeof (Arc *)); | |

unplaced_arcs = (Arc **) xmalloc (numarcs * sizeof (Arc *)); | |

free (unused_syms); | |

free (used_syms); | |

free (scratch_syms); | |

free (high_arcs); | |

free (scratch_arcs); | |

free (unplaced_arcs); | |

} | |

/* Place functions based on the arcs in THE_ARCS with ARC_COUNT entries; | |

place unused arcs into UNPLACED_ARCS/UNPLACED_ARC_COUNT. | |

If ALL is nonzero, then place all functions referenced by THE_ARCS, | |

else only place those referenced in the top 99% of the arcs in THE_ARCS. */ | |

#define MOST 0.99 | |

static void | |

order_and_dump_functions_by_arcs (Arc **the_arcs, unsigned long arc_count, | |

int all, Arc **unplaced_arcs, | |

unsigned long *unplaced_arc_count) | |

{ | |

#ifdef __GNUC__ | |

unsigned long long tmp_arcs, total_arcs; | |

#else | |

unsigned long tmp_arcs, total_arcs; | |

#endif | |

unsigned int arc_index; | |

/* If needed, compute the total arc count. | |

Note we don't compensate for overflow if that happens! */ | |

if (! all) | |

{ | |

total_arcs = 0; | |

for (arc_index = 0; arc_index < arc_count; arc_index++) | |

total_arcs += the_arcs[arc_index]->count; | |

} | |

else | |

total_arcs = 0; | |

tmp_arcs = 0; | |

for (arc_index = 0; arc_index < arc_count; arc_index++) | |

{ | |

Sym *sym1, *sym2; | |

Sym *child, *parent; | |

tmp_arcs += the_arcs[arc_index]->count; | |

/* Ignore this arc if it's already been placed. */ | |

if (the_arcs[arc_index]->has_been_placed) | |

continue; | |

child = the_arcs[arc_index]->child; | |

parent = the_arcs[arc_index]->parent; | |

/* If we're not using all arcs, and this is a rarely used | |

arc, then put it on the unplaced_arc list. Similarly | |

if both the parent and child of this arc have been placed. */ | |

if ((! all && (double)tmp_arcs / (double)total_arcs > MOST) | |

|| child->has_been_placed || parent->has_been_placed) | |

{ | |

unplaced_arcs[(*unplaced_arc_count)++] = the_arcs[arc_index]; | |

continue; | |

} | |

/* If all slots in the parent and child are full, then there isn't | |

anything we can do right now. We'll place this arc on the | |

unplaced arc list in the hope that a global positioning | |

algorithm can use it to place function chains. */ | |

if (parent->next && parent->prev && child->next && child->prev) | |

{ | |

unplaced_arcs[(*unplaced_arc_count)++] = the_arcs[arc_index]; | |

continue; | |

} | |

/* If the parent is unattached, then find the closest | |

place to attach it onto child's chain. Similarly | |

for the opposite case. */ | |

if (!parent->next && !parent->prev) | |

{ | |

int next_count = 0; | |

int prev_count = 0; | |

Sym *prev = child; | |

Sym *next = child; | |

/* Walk to the beginning and end of the child's chain. */ | |

while (next->next) | |

{ | |

next = next->next; | |

next_count++; | |

} | |

while (prev->prev) | |

{ | |

prev = prev->prev; | |

prev_count++; | |

} | |

/* Choose the closest. */ | |

child = next_count < prev_count ? next : prev; | |

} | |

else if (! child->next && !child->prev) | |

{ | |

int next_count = 0; | |

int prev_count = 0; | |

Sym *prev = parent; | |

Sym *next = parent; | |

while (next->next) | |

{ | |

next = next->next; | |

next_count++; | |

} | |

while (prev->prev) | |

{ | |

prev = prev->prev; | |

prev_count++; | |

} | |

parent = prev_count < next_count ? prev : next; | |

} | |

else | |

{ | |

/* Couldn't find anywhere to attach the functions, | |

put the arc on the unplaced arc list. */ | |

unplaced_arcs[(*unplaced_arc_count)++] = the_arcs[arc_index]; | |

continue; | |

} | |

/* Make sure we don't tie two ends together. */ | |

sym1 = parent; | |

if (sym1->next) | |

while (sym1->next) | |

sym1 = sym1->next; | |

else | |

while (sym1->prev) | |

sym1 = sym1->prev; | |

sym2 = child; | |

if (sym2->next) | |

while (sym2->next) | |

sym2 = sym2->next; | |

else | |

while (sym2->prev) | |

sym2 = sym2->prev; | |

if (sym1 == child | |

&& sym2 == parent) | |

{ | |

/* This would tie two ends together. */ | |

unplaced_arcs[(*unplaced_arc_count)++] = the_arcs[arc_index]; | |

continue; | |

} | |

if (parent->next) | |

{ | |

/* Must attach to the parent's prev field. */ | |

if (! child->next) | |

{ | |

/* parent-prev and child-next */ | |

parent->prev = child; | |

child->next = parent; | |

the_arcs[arc_index]->has_been_placed = 1; | |

} | |

} | |

else if (parent->prev) | |

{ | |

/* Must attach to the parent's next field. */ | |

if (! child->prev) | |

{ | |

/* parent-next and child-prev */ | |

parent->next = child; | |

child->prev = parent; | |

the_arcs[arc_index]->has_been_placed = 1; | |

} | |

} | |

else | |

{ | |

/* Can attach to either field in the parent, depends | |

on where we've got space in the child. */ | |

if (child->prev) | |

{ | |

/* parent-prev and child-next. */ | |

parent->prev = child; | |

child->next = parent; | |

the_arcs[arc_index]->has_been_placed = 1; | |

} | |

else | |

{ | |

/* parent-next and child-prev. */ | |

parent->next = child; | |

child->prev = parent; | |

the_arcs[arc_index]->has_been_placed = 1; | |

} | |

} | |

} | |

/* Dump the chains of functions we've made. */ | |

for (arc_index = 0; arc_index < arc_count; arc_index++) | |

{ | |

Sym *sym; | |

if (the_arcs[arc_index]->parent->has_been_placed | |

|| the_arcs[arc_index]->child->has_been_placed) | |

continue; | |

sym = the_arcs[arc_index]->parent; | |

/* If this symbol isn't attached to any other | |

symbols, then we've got a rarely used arc. | |

Skip it for now, we'll deal with them later. */ | |

if (sym->next == NULL | |

&& sym->prev == NULL) | |

continue; | |

/* Get to the start of this chain. */ | |

while (sym->prev) | |

sym = sym->prev; | |

while (sym) | |

{ | |

/* Mark it as placed. */ | |

sym->has_been_placed = 1; | |

printf ("%s\n", sym->name); | |

sym = sym->next; | |

} | |

} | |

/* If we want to place all the arcs, then output | |

those which weren't placed by the main algorithm. */ | |

if (all) | |

for (arc_index = 0; arc_index < arc_count; arc_index++) | |

{ | |

Sym *sym; | |

if (the_arcs[arc_index]->parent->has_been_placed | |

|| the_arcs[arc_index]->child->has_been_placed) | |

continue; | |

sym = the_arcs[arc_index]->parent; | |

sym->has_been_placed = 1; | |

printf ("%s\n", sym->name); | |

} | |

} | |

/* Compare two function_map structs based on file name. | |

We want to sort in ascending order. */ | |

static int | |

cmp_symbol_map (const void * l, const void * r) | |

{ | |

return filename_cmp (((struct function_map *) l)->file_name, | |

((struct function_map *) r)->file_name); | |

} | |

/* Print a suggested .o ordering for files on a link line based | |

on profiling information. This uses the function placement | |

code for the bulk of its work. */ | |

void | |

cg_print_file_ordering (void) | |

{ | |

unsigned long scratch_arc_count; | |

unsigned long arc_index; | |

unsigned long sym_index; | |

Arc **scratch_arcs; | |

char *last; | |

scratch_arc_count = 0; | |

scratch_arcs = (Arc **) xmalloc (numarcs * sizeof (Arc *)); | |

for (arc_index = 0; arc_index < numarcs; arc_index++) | |

{ | |

if (! arcs[arc_index]->parent->mapped | |

|| ! arcs[arc_index]->child->mapped) | |

arcs[arc_index]->has_been_placed = 1; | |

} | |

order_and_dump_functions_by_arcs (arcs, numarcs, 0, | |

scratch_arcs, &scratch_arc_count); | |

/* Output .o's not handled by the main placement algorithm. */ | |

for (sym_index = 0; sym_index < symtab.len; sym_index++) | |

{ | |

if (symtab.base[sym_index].mapped | |

&& ! symtab.base[sym_index].has_been_placed) | |

printf ("%s\n", symtab.base[sym_index].name); | |

} | |

qsort (symbol_map, symbol_map_count, sizeof (struct function_map), cmp_symbol_map); | |

/* Now output any .o's that didn't have any text symbols. */ | |

last = NULL; | |

for (sym_index = 0; sym_index < symbol_map_count; sym_index++) | |

{ | |

unsigned int index2; | |

/* Don't bother searching if this symbol | |

is the same as the previous one. */ | |

if (last && !filename_cmp (last, symbol_map[sym_index].file_name)) | |

continue; | |

for (index2 = 0; index2 < symtab.len; index2++) | |

{ | |

if (! symtab.base[index2].mapped) | |

continue; | |

if (!filename_cmp (symtab.base[index2].name, | |

symbol_map[sym_index].file_name)) | |

break; | |

} | |

/* If we didn't find it in the symbol table, then it must | |

be a .o with no text symbols. Output it last. */ | |

if (index2 == symtab.len) | |

printf ("%s\n", symbol_map[sym_index].file_name); | |

last = symbol_map[sym_index].file_name; | |

} | |

} |