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[binutils.git] / gprof / call_graph.c
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1 /* call_graph.c - Create call graphs.
3 Copyright 2000, 2001, 2002 Free Software Foundation, Inc.
5 This file is part of GNU Binutils.
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 2 of the License, or
10 (at your option) any later version.
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.
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., 59 Temple Place - Suite 330, Boston, MA
20 02111-1307, USA. */
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"
33 void
34 cg_tally (from_pc, self_pc, count)
35 bfd_vma from_pc;
36 bfd_vma self_pc;
37 unsigned long count;
39 Sym *parent;
40 Sym *child;
42 parent = sym_lookup (&symtab, from_pc);
43 child = sym_lookup (&symtab, self_pc);
45 if (child == NULL || parent == NULL)
46 return;
48 /* If we're doing line-by-line profiling, both the parent and the
49 child will probably point to line symbols instead of function
50 symbols. For the parent this is fine, since this identifies the
51 line number in the calling routing, but the child should always
52 point to a function entry point, so we back up in the symbol
53 table until we find it.
55 For normal profiling, is_func will be set on all symbols, so this
56 code will do nothing. */
57 while (child >= symtab.base && ! child->is_func)
58 --child;
60 if (child < symtab.base)
61 return;
63 /* Keep arc if it is on INCL_ARCS table or if the INCL_ARCS table
64 is empty and it is not in the EXCL_ARCS table. */
65 if (sym_id_arc_is_present (&syms[INCL_ARCS], parent, child)
66 || (syms[INCL_ARCS].len == 0
67 && !sym_id_arc_is_present (&syms[EXCL_ARCS], parent, child)))
69 child->ncalls += count;
70 DBG (TALLYDEBUG,
71 printf (_("[cg_tally] arc from %s to %s traversed %lu times\n"),
72 parent->name, child->name, count));
73 arc_add (parent, child, count);
77 /* Read a record from file IFP describing an arc in the function
78 call-graph and the count of how many times the arc has been
79 traversed. FILENAME is the name of file IFP and is provided
80 for formatting error-messages only. */
82 void
83 cg_read_rec (ifp, filename)
84 FILE *ifp;
85 const char *filename;
87 bfd_vma from_pc, self_pc;
88 unsigned int count;
90 if (gmon_io_read_vma (ifp, &from_pc)
91 || gmon_io_read_vma (ifp, &self_pc)
92 || gmon_io_read_32 (ifp, &count))
94 fprintf (stderr, _("%s: %s: unexpected end of file\n"),
95 whoami, filename);
96 done (1);
99 DBG (SAMPLEDEBUG,
100 printf ("[cg_read_rec] frompc 0x%lx selfpc 0x%lx count %lu\n",
101 (unsigned long) from_pc, (unsigned long) self_pc,
102 (unsigned long) count));
103 /* Add this arc: */
104 cg_tally (from_pc, self_pc, count);
107 /* Write all the arcs in the call-graph to file OFP. FILENAME is
108 the name of OFP and is provided for formatting error-messages
109 only. */
111 void
112 cg_write_arcs (ofp, filename)
113 FILE *ofp;
114 const char *filename;
116 Arc *arc;
117 Sym *sym;
119 for (sym = symtab.base; sym < symtab.limit; sym++)
121 for (arc = sym->cg.children; arc; arc = arc->next_child)
123 if (gmon_io_write_8 (ofp, GMON_TAG_CG_ARC)
124 || gmon_io_write_vma (ofp, arc->parent->addr)
125 || gmon_io_write_vma (ofp, arc->child->addr)
126 || gmon_io_write_32 (ofp, arc->count))
128 perror (filename);
129 done (1);
131 DBG (SAMPLEDEBUG,
132 printf ("[cg_write_arcs] frompc 0x%lx selfpc 0x%lx count %lu\n",
133 (unsigned long) arc->parent->addr,
134 (unsigned long) arc->child->addr, arc->count));