| 1 | /* call_graph.c - Create call graphs. |
| 2 | |
| 3 | Copyright 1999, 2000, 2001, 2002, 2004, 2007 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GNU Binutils. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA |
| 20 | 02110-1301, USA. */ |
| 21 | \f |
| 22 | #include "gprof.h" |
| 23 | #include "search_list.h" |
| 24 | #include "source.h" |
| 25 | #include "symtab.h" |
| 26 | #include "cg_arcs.h" |
| 27 | #include "call_graph.h" |
| 28 | #include "corefile.h" |
| 29 | #include "gmon_io.h" |
| 30 | #include "gmon_out.h" |
| 31 | #include "sym_ids.h" |
| 32 | |
| 33 | void |
| 34 | cg_tally (bfd_vma from_pc, bfd_vma self_pc, unsigned long count) |
| 35 | { |
| 36 | Sym *parent; |
| 37 | Sym *child; |
| 38 | |
| 39 | parent = sym_lookup (&symtab, from_pc); |
| 40 | child = sym_lookup (&symtab, self_pc); |
| 41 | |
| 42 | if (child == NULL || parent == NULL) |
| 43 | return; |
| 44 | |
| 45 | /* If we're doing line-by-line profiling, both the parent and the |
| 46 | child will probably point to line symbols instead of function |
| 47 | symbols. For the parent this is fine, since this identifies the |
| 48 | line number in the calling routing, but the child should always |
| 49 | point to a function entry point, so we back up in the symbol |
| 50 | table until we find it. |
| 51 | |
| 52 | For normal profiling, is_func will be set on all symbols, so this |
| 53 | code will do nothing. */ |
| 54 | while (child >= symtab.base && ! child->is_func) |
| 55 | --child; |
| 56 | |
| 57 | if (child < symtab.base) |
| 58 | return; |
| 59 | |
| 60 | /* Keep arc if it is on INCL_ARCS table or if the INCL_ARCS table |
| 61 | is empty and it is not in the EXCL_ARCS table. */ |
| 62 | if (sym_id_arc_is_present (&syms[INCL_ARCS], parent, child) |
| 63 | || (syms[INCL_ARCS].len == 0 |
| 64 | && !sym_id_arc_is_present (&syms[EXCL_ARCS], parent, child))) |
| 65 | { |
| 66 | child->ncalls += count; |
| 67 | DBG (TALLYDEBUG, |
| 68 | printf (_("[cg_tally] arc from %s to %s traversed %lu times\n"), |
| 69 | parent->name, child->name, count)); |
| 70 | arc_add (parent, child, count); |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | /* Read a record from file IFP describing an arc in the function |
| 75 | call-graph and the count of how many times the arc has been |
| 76 | traversed. FILENAME is the name of file IFP and is provided |
| 77 | for formatting error-messages only. */ |
| 78 | |
| 79 | void |
| 80 | cg_read_rec (FILE *ifp, const char *filename) |
| 81 | { |
| 82 | bfd_vma from_pc, self_pc; |
| 83 | unsigned int count; |
| 84 | |
| 85 | if (gmon_io_read_vma (ifp, &from_pc) |
| 86 | || gmon_io_read_vma (ifp, &self_pc) |
| 87 | || gmon_io_read_32 (ifp, &count)) |
| 88 | { |
| 89 | fprintf (stderr, _("%s: %s: unexpected end of file\n"), |
| 90 | whoami, filename); |
| 91 | done (1); |
| 92 | } |
| 93 | |
| 94 | DBG (SAMPLEDEBUG, |
| 95 | printf ("[cg_read_rec] frompc 0x%lx selfpc 0x%lx count %lu\n", |
| 96 | (unsigned long) from_pc, (unsigned long) self_pc, |
| 97 | (unsigned long) count)); |
| 98 | /* Add this arc: */ |
| 99 | cg_tally (from_pc, self_pc, count); |
| 100 | } |
| 101 | |
| 102 | /* Write all the arcs in the call-graph to file OFP. FILENAME is |
| 103 | the name of OFP and is provided for formatting error-messages |
| 104 | only. */ |
| 105 | |
| 106 | void |
| 107 | cg_write_arcs (FILE *ofp, const char *filename) |
| 108 | { |
| 109 | Arc *arc; |
| 110 | Sym *sym; |
| 111 | |
| 112 | for (sym = symtab.base; sym < symtab.limit; sym++) |
| 113 | { |
| 114 | for (arc = sym->cg.children; arc; arc = arc->next_child) |
| 115 | { |
| 116 | if (gmon_io_write_8 (ofp, GMON_TAG_CG_ARC) |
| 117 | || gmon_io_write_vma (ofp, arc->parent->addr) |
| 118 | || gmon_io_write_vma (ofp, arc->child->addr) |
| 119 | || gmon_io_write_32 (ofp, arc->count)) |
| 120 | { |
| 121 | perror (filename); |
| 122 | done (1); |
| 123 | } |
| 124 | DBG (SAMPLEDEBUG, |
| 125 | printf ("[cg_write_arcs] frompc 0x%lx selfpc 0x%lx count %lu\n", |
| 126 | (unsigned long) arc->parent->addr, |
| 127 | (unsigned long) arc->child->addr, arc->count)); |
| 128 | } |
| 129 | } |
| 130 | } |